CN110017667B - Horizontal vibration centrifugal dehydrator - Google Patents
Horizontal vibration centrifugal dehydrator Download PDFInfo
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- CN110017667B CN110017667B CN201910322511.8A CN201910322511A CN110017667B CN 110017667 B CN110017667 B CN 110017667B CN 201910322511 A CN201910322511 A CN 201910322511A CN 110017667 B CN110017667 B CN 110017667B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/022—Arrangements of drives, bearings, supports
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/02—Applications of driving mechanisms, not covered by another subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment
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Abstract
The invention discloses a horizontal vibration centrifugal dehydrator, and relates to mine clean coal treatment and dehydration equipment. In the double-shaft inertia vibration exciter, a circular gear transmission mechanism is replaced by a non-circular gear mechanism; the rotary power source is driven by the non-circular gear mechanism to drive the eccentric mass block to rotate around the rotating shaft; the non-circular gear mechanism comprises a driving non-circular gear directly or indirectly driven by a rotary power source and a driven non-circular gear which is directly and coaxially arranged with the eccentric mass block and drives the eccentric mass block to rotate. The dewatering efficiency of the horizontal vibration centrifugal dewatering machine can be effectively improved, and meanwhile, the yield can be actively controlled.
Description
Technical Field
The invention relates to mine clean coal treatment and dehydration equipment, in particular to a horizontal vibration centrifugal dehydrator.
Background
The vibration centrifugal dehydrator is used for improving the technical level of comprehensive utilization and clean washing processing of coal resources, enhancing the development work of coal washing processing equipment, and has remarkable economic and social benefits with stable development working performance and high reliability.
The vibration centrifugal dehydrator applied to the coal industry in China is used for dehydrating fine coal and coal slime. The vibration centrifugal dehydrator is vertical or horizontal. The main shafts of the vertical vibration centrifugal dehydrator and the horizontal vibration centrifugal dehydrator are respectively installed in a vertical mode and a horizontal mode. The vertical vibration centrifugal dehydrator has the problems of small granularity of fed materials, low treatment capacity, high energy consumption, high installation height, serious oil leakage, over-quick abrasion of a screen basket, inconvenient overhaul and maintenance, higher factory investment and production cost and the like, so that most industrial departments adopt the horizontal vibration centrifugal dehydrator to dehydrate materials at present. The work organism of horizontal vibration centrifugal dehydrator is the cone basket that has the sieve mesh, and the material that need dewater in the toper basket is under the effect of centrifugal force, and its moisture is thrown away from the sieve mesh of cone, because the axial vibration of toper basket, the material will be followed the tip of cone and removed to the main aspects gradually to discharge from the main aspects. The machine utilizes vibration to strengthen the dehydration effect and has good process indexes.
WZT-1000 novel horizontal vibration centrifugal dehydrator [ J ] coal processing and comprehensive utilization, 1999 (author Liang Han, Wang Cheng, Liu Zong, etc.). The centrifugal dehydrator is a typical conventional horizontal vibration centrifugal dehydrator. Centrifugal forces generated by the upper and lower groups of eccentric blocks of the horizontal vibration centrifugal dehydrator are superposed in the horizontal direction along the rotary main shaft of the conical screen basket and are mutually counteracted in the vertical direction, so that sine wave exciting force is formed in the direction along the rotary main shaft of the conical screen basket, and the vibrator drives the screen basket to horizontally reciprocate and linearly vibrate along the rotary main shaft under the action of the exciting force. But the speed of the conical screen basket in the material axis direction is related to the rotating speed of the motor of the primary vibration exciter and the rotating speed of the motor of the secondary vibration exciter, the dehydration rate of the traditional horizontal type vibration centrifugal dehydrator is determined together, and the difficulty of the control process of the dehydration rate of the traditional vibration centrifugal dehydrator is greatly improved.
The invention patent with publication number CN107228528A discloses a four-machine driven double-screen basket balance horizontal vibration centrifugal dehydrator and a parameter determination method. The material loading and unloading mechanism and the screen basket box body mechanism are connected into a whole and do not vibrate as an exoplast. The dehydration transmission mechanism is connected with the screen basket box body through a shearing rubber spring and is powered by a motor-belt wheel device serving as a power mechanism. When the device works, the material is fed to the screen basket by the material loading and unloading mechanism and the material is dewatered under the action of vibration and centrifugal force. However, the horizontal vibration centrifugal dehydrator is complex in structure, the selection of the rotating speed of the conical screen basket and the vibration frequency and amplitude of the vibration mechanism complies with the theory of material movement of the vibration centrifuge, and the vibration centrifuge has the problems of unstable operation, poor processing capacity and the like, and the problems are closely related to the design of dynamic parameters of the centrifugal dehydrator and the fluctuation of the amount of processed materials.
The utility model discloses a utility model patent with publication number CN202350435U discloses a horizontal vibration centrifugal dehydrator of polyester spring transmission exciting force. This horizontal vibration centrifugal dehydrator of polyester spring transmission exciting force includes the base, is equipped with on the base and connects vibrating body and the solid-liquid separation storehouse body as an organic whole, and the vibration exciter is installed to vibrating body bilateral symmetry, installs the bearing body in the vibrating body, and the main shaft passes through both ends bearing and installs in the bearing body, and main shaft one end is connected with the basket, and the belt pulley is installed to the main shaft other end, and the belt pulley passes through the belt to be connected with the motor of installing on the base, and the bearing body outside sets up the. The horizontal vibration centrifugal dehydrator with the polyester spring for transmitting the exciting force has stable operation and low noise. However, the vibration force generated by the vibrating body of the horizontal vibration centrifugal dehydrator is still a symmetrical vibration force. The vibrating centrifugal dehydrator is easy to have throwing motion and reverse sliding.
The utility model discloses a utility model patent of publication No. CN201407876Y discloses a horizontal self-discharging centrifugal dehydrator. This horizontal self-discharging centrifugal dehydrator includes the frame, a housing, the basket, the feeder pipe, the main shaft, the box, the support, the basket is the frustum of a cone shape barrel, the horizontal level of barrel is placed, the tip of the frustum of a cone barrel is passed through basket seat and taper sleeve and is connected with the main shaft, adopt the horizontal self-discharging centrifugal dehydrator of this kind of structure, need not vibration system, also not unload by the difference of rotating speed between scraper and basket, but accomplish from unloading for the basket horizontal placement of big cone angle through the design, annular rubber spring can weaken the impact of pan feeding to centrifuge. The horizontal self-discharging centrifugal dehydrator is simple in structure and stable in operation. However, the horizontal self-discharging centrifugal dehydrator does not relate to a primary vibration exciter, can not realize active control discharge, and is difficult to ensure the dehydration rate.
At present, as shown in fig. 1, a vibration source of a horizontal vibration centrifugal dehydrator mostly adopts a vibration motor, and a working body is a conical screen basket. According to the process requirements, the material intermittently slides forwards along the inner wall of the conical screen basket of the vibrating centrifuge, so that centrifugal dehydration and automatic discharge are realized, and reverse sliding or jumping cannot occur. In a movement period of the material, in a sliding interval, the force of the material acting on the cone is the sum of the positive sliding friction force and the inertia force component, and in an intermittent interval, the material and the cone are relatively static, and only the inertia force component exists. However, the vibration sources of the traditional horizontal vibration centrifugal dehydrator are all vibration motors, and the selection of the rotating speed of the conical screen basket and the vibration frequency and amplitude of the vibration mechanism obeys the theory of the material movement of the vibration centrifuge, so that the throwing movement does not occur, and the process requirement for realizing the material dehydration is difficult.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and solve the practical problems, thereby providing a horizontal vibration centrifugal dehydrator. The invention aims to make the invention different from the traditional horizontal vibration centrifugal dehydrator, in the traditional double-shaft inertia vibration exciter, a rotary power source drives an eccentric mass block to rotate around a rotating shaft through a circular gear transmission mechanism; the invention replaces the circular gear transmission mechanism with a non-circular gear mechanism; the working body is changed into a cylindrical screen basket from a conical screen basket, so that the material is in a static state and an advancing state all the time in the centrifugal dehydration process, the reverse sliding and jumping of the material are eliminated, and the dehydration efficiency of the horizontal vibration centrifugal dehydrator is effectively improved.
The technical scheme provided by the invention for solving the problems is as follows: a horizontal vibration centrifugal dehydrator comprises a rotary power source, a double-shaft inertia vibration exciter and a centrifugal dehydrating device, wherein the rotary power source drives the centrifugal dehydrating device to carry out centrifugal dehydrating treatment on materials; all the eccentric mechanisms are uniformly distributed on a plane; the eccentric mechanism comprises an eccentric mass block rotating around a rotating shaft; the rotating power source drives the eccentric mass block to rotate around the rotating shaft through the circular gear transmission mechanism; the rotating speeds of the eccentric mass blocks are consistent, and the component force of the resultant force of the eccentric forces generated by the eccentric mass blocks on a plane is 0; the method is characterized in that: replacing a circular gear transmission mechanism with a non-circular gear mechanism; the rotary power source is driven by the non-circular gear mechanism to drive the eccentric mass block to rotate around the rotating shaft; the non-circular gear mechanism comprises a driving non-circular gear directly or indirectly driven by a rotary power source and a driven non-circular gear which is directly and coaxially arranged with the eccentric mass block and drives the eccentric mass block to rotate.
The further technical scheme is as follows: the circular gear transmission is cylindrical gear transmission.
The further technical scheme is as follows: the number of the eccentric mechanisms is two; the two eccentric mechanisms are in synchronous cylindrical gear transmission, and the rotary power source drives one eccentric mechanism to rotate.
The further technical scheme is as follows: the non-circular gear mechanism comprises one or more pairs of non-circular gears, and gear teeth of the two non-circular gears which are in contact are meshed with each other.
The further technical scheme is as follows: the non-circular gear mechanism comprises a driving non-circular gear directly or indirectly driven by a rotary power source and a driven non-circular gear coaxially rotating with the eccentric mass block; the driving non-circular gear is meshed with the driven non-circular gear; the order of the pitch curve of the driven non-circular gear is 1, and the long axis of the driven non-circular gear is parallel or vertical to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block.
The further technical scheme is as follows: the non-circular gear mechanism comprises a driving non-circular gear directly or indirectly driven by a rotary power source and a driven non-circular gear coaxially rotating with the eccentric mass block; the order of a pitch curve of the driven non-circular gear in the non-circular gear mechanism is 2, and the long axis of the driven non-circular gear is parallel or vertical to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block.
The further technical scheme is as follows: the centrifugal dehydration device comprises a screen basket which is a revolving body and a feeding pipe; the feeding pipe is fixed on the rack, an outlet of the feeding pipe extends into the screen basket, and the screen basket is driven by the rotary power source to rotate.
The further technical scheme is as follows: the screen basket is driven to do rotary motion, a rotary power source is a motor, a rotating shaft of the motor is connected with a rotating shaft four-purpose elastic coupling, a driving cylindrical gear is connected to a spline on the rotating shaft four, the driving cylindrical gear is meshed with a driven cylindrical gear, the driven cylindrical gear is connected to a rotating shaft five through a spline, and the rotating shaft five penetrates through a thrust bearing on the vibration exciter shell and is rigidly connected with the screen basket.
The further technical scheme is as follows: the double-shaft inertia vibration exciter is rigidly fixed on an exciter shell capable of vibrating in the horizontal direction through bolts, and the exciter shell is connected with the excited device frame through a spring.
Compared with the prior art, the invention has the beneficial effects that:
the horizontal vibrating centrifugal dehydrator is characterized in that a non-circular gear mechanism is added between a rotating power source and an eccentric mass block rotating shaft in a double-shaft inertia vibration exciter, and the non-circular gear mechanism usually consists of a pair of non-circular gears or a plurality of pairs of non-circular gears; the horizontal vibration centrifugal dehydrator adopts a cylindrical screen basket, and the speed of the axial direction of the screen basket is only related to the double-shaft inertia vibration exciter. The dehydration rate of the modified horizontal vibration centrifugal dehydrator is only related to the rotating speed of the cylindrical sieve basket, and the dehydration rate of the horizontal vibration centrifugal dehydrator can be effectively improved by changing the rotating speed of the cylindrical sieve basket. The productivity of the modified horizontal vibration centrifugal dehydrator is only related to the double-shaft inertia vibration exciter. The rotating speeds of the double-shaft inertia vibration exciter and the cylindrical screen basket are adjusted, so that the sliding friction force of the material in the operation process is smaller than the maximum advancing asymmetric inertia force and is simultaneously larger than the maximum retreating asymmetric inertia force, the material is in a static state and an advancing state all the time in the operation process, the reverse sliding and jumping of the material are eliminated, and the dehydration efficiency of the horizontal vibration centrifugal dehydrator is effectively improved.
Drawings
FIG. 1 is a schematic view of a conventional vibratory centrifugal dehydrator mechanism;
FIG. 2 is a schematic view of a modified vibratory centrifugal dehydrator mechanism;
FIG. 3 is a curve of the rotation angle and exciting force of the eccentric mass block of the conventional symmetric inertial force vibration exciter in the conventional vibrating centrifugal dehydrator;
FIG. 4 is a curve of the active non-circular gear rotation angle versus the excitation force of the modified symmetric inertial force vibration exciter;
fig. 5 is a curve of the rotation angle of the active non-circular gear of the modified asymmetric inertia force vibration exciter and the exciting force.
Reference numerals: 1-a machine frame of an excited device; 2-exciting the vibrator shell; 3-driven synchronous cylindrical gear; 4-rotating shaft III; 5-eccentric mass block two; 6-driven circular gear; 7-eccentric mass block one; 8-driving synchronous cylindrical gear; 9-rotating shaft two; 10-driving circular gear; 11-a first rotating shaft; 12-driving non-circular gear; 13-rotating shaft five; 14-a thrust bearing; 15-a screen basket; 16-a feeder tube; 17-a discharge hole; 18-a centrate outlet; 19-a motor; 20-an elastic coupling; 21-driving cylindrical gear; 22-rotating shaft four; 23-driven cylindrical gear; 24. a driven non-circular gear.
Detailed Description
The invention is further described with reference to the following figures and examples.
A horizontal vibration centrifugal dehydrator is a vibrator for dehydrating coal slime and fine coal. The structure of the vibration centrifugal dehydrator is complex, but the vibration centrifugal dehydrator has good dehydration effect, and the mechanism of the horizontal vibration centrifugal machine in the coal industry department at present; the mechanism of a traditional horizontal vibration centrifuge is shown in fig. 1 and comprises a rotary power source, a double-shaft inertia vibration exciter and a centrifugal dehydration device, wherein the rotary power source drives the centrifugal dehydration device to carry out centrifugal dehydration treatment on materials; all the eccentric mechanisms are uniformly distributed on a plane; the eccentric mechanism comprises an eccentric mass block rotating around a rotating shaft; the rotating power source drives the eccentric mass block to rotate around the rotating shaft through the circular gear transmission mechanism; the rotating speeds of the eccentric mass blocks are consistent, and the component force of the resultant force of the eccentric forces generated by the eccentric mass blocks on a plane is 0; in the traditional horizontal vibration centrifuge, a circular gear transmission mechanism of a double-shaft inertia vibration exciter is replaced by a non-circular gear mechanism; the rotary power source is driven by the non-circular gear mechanism to drive the eccentric mass to rotate around the rotating shaft; the non-circular gear mechanism comprises a driving non-circular gear 12 directly or indirectly driven by a rotary power source and a driven non-circular gear 24 which is directly and coaxially arranged with the eccentric mass and drives the eccentric mass to rotate.
In the conventional horizontal vibration centrifugal dehydrator, as shown in fig. 1, a structural diagram of a screen basket 15 is fixed on an exciter housing 2 capable of vibrating in the horizontal direction by a pair of bearings and bearing seats, the exciter housing 2 is supported by a plurality of groups of water plate springs, the lower ends of the plate springs are supported on a driven device frame 1, springs capable of vibrating horizontally and relatively are installed on two sides of the exciter housing 2, and the other ends of the springs are connected with the driven device frame 1.
The rotary power source may be an electric motor, a hydraulic motor, a pneumatic motor, a diesel engine, or the like.
As shown in figure 1, the double-shaft inertia vibration exciter mainly comprises a motor 19, two identical eccentric mass blocks (an eccentric mass block I7 and an eccentric mass block II 5), a circular gear transmission mechanism and a pair of synchronous cylindrical gears, wherein an output shaft of the motor 19 is connected with a driving circular gear 10 in the circular gear transmission mechanism, the motor 19 drives the driving circular gear 10 to rotate around a first rotating shaft 11, a driven circular gear 6 in the circular gear transmission mechanism is connected with a driving synchronous cylindrical gear 8 of the synchronous cylindrical gear pair, the geometric parameters of the driving synchronous cylindrical gear 8 and the driven synchronous cylindrical gear 3 are the same, the eccentric mass block I7 and the eccentric mass block II 5 are respectively and fixedly connected with the two synchronous cylindrical gears, the two eccentric mass blocks are symmetrically arranged about a vertical bisector of a rotating center connecting line of the two eccentric mass blocks, the motor 19 drives the eccentric mass block I7 and the eccentric mass block II 5 to respectively rotate around a, The third rotating shaft 4 rotates.
The centrifugal dewatering device mainly comprises a rotary power source, a gear mechanism and a main transmission rotating shaft, wherein the gear mechanism comprises a driving cylindrical gear 21 and a driven cylindrical gear 23, an output shaft of the rotary power source is connected with a rotating shaft four 22 through an elastic coupling 20, the rotating shaft four 22 is connected with the driving cylindrical gear 21, the driving cylindrical gear 21 is in meshing transmission with the driven cylindrical gear 23, the driven cylindrical gear 23 is connected with a rotating shaft five 13, and the rotating shaft five 13 inputs the power of the driven cylindrical gear 23 into the screen basket 15 through a thrust bearing 14.
The screen basket 15 is rigidly connected with the five rotating shafts 13, the feeding pipe 16 is fixed on the frame, a centrifugal liquid outlet 18 is arranged below the screen basket 15 close to one side of the five main transmission rotating shafts 13, and a discharge hole 17 is arranged below the screen basket 15 far away from one side of the five rotating shafts 13.
The double-shaft inertia vibration exciter and the centrifugal dewatering device are both rigidly fixed on an exciter shell 2 capable of vibrating in the horizontal direction through bolts, the exciter shell 2 is arranged on a spring capable of vibrating horizontally and relatively, and the spring is fixed on a frame of the horizontal vibration centrifugal dewatering machine.
The screen basket 15 of the conventional horizontal vibratory centrifugal dehydrator is tapered as shown in fig. 1. The material is subjected to centrifugal force, friction with the inner surface of the screen basket 15, and inertia force of the biaxial inertial vibration exciter. The conical basket causes the speed of the material in the axial direction to be related not only to the speed of the two-shaft inertial exciter, which is a common motor with a cradle, but also to the rotational speed of the motor. The double-shaft inertia vibration exciter and the screen basket 15 are coupled with the rotating speed of the motor, the relation determines the dehydration rate of the traditional horizontal vibration centrifugal dehydrator, and the difficulty of the control process of the traditional vibration centrifugal dehydrator is greatly improved. The conventional horizontal vibratory centrifugal dehydrator can change the productivity only when adjusting certain parameters under the condition that the inclination angle of the conical surface of the basket 15 is smaller than the friction angle of the materials. The conical screen basket 15 causes the material to generate a large speed in the axial direction, and although the production efficiency can be effectively improved, the material at the center cannot be discharged out of the screen basket 15 due to the fact that the material has a large speed in the axial direction, and the dehydration rate of the traditional horizontal vibration centrifugal dehydrator is reduced.
A double-shaft inertia vibration exciter of a traditional horizontal vibration centrifugal dehydrator generates symmetrical inertia vibration force to drive a screen to vibrate axially. The surface of the screen basket 15 is uniformly distributed with holes with the same size. The screen basket 15 moves material along the inner surface of the screen basket 15 during operation. If the holes of the screen basket 15 are too small, the holes are blocked by small materials, so that the moisture in the screen basket 15 cannot be thrown out, and the horizontal vibration centrifugal dehydrator is ineffective in dehydration. If the holes of the screen basket 15 are too large, larger materials are thrown out through the holes of the screen basket 15, and the yield of the horizontal vibration centrifugal dehydrator is reduced.
The curve of the eccentric mass block corner and the exciting force of the symmetric inertia force vibration exciter in the traditional horizontal vibration centrifugal dehydrator is shown in figure 3. The rotation angle of an eccentric mass block of a traditional symmetric inertia force vibration exciter and the exciting force are in periodic change, the period is 2 pi, the inertia exciting force is in a monotone increasing trend along with the increase of the rotation angle of the eccentric mass block along with the rotation angle of the eccentric mass block in an interval of 0-pi/2, and when the rotation angle of the eccentric mass block is pi/2, the inertia exciting force reaches the maximum. The rotation angle of the eccentric mass block is in the interval of pi/2-pi, the inertia exciting force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is pi, the inertia exciting force disappears. The rotation angle of the eccentric mass block is in the interval of pi-3 pi/2, the inertial excitation force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 3 pi/2, the inertial excitation force reaches the maximum reversal. The rotation angle of the eccentric mass block is in the interval of 3 pi/2-2 pi, the inertia exciting force is in a monotonous increasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 2 pi, the inertia exciting force disappears.
Fig. 2 shows a schematic diagram of the horizontal vibration centrifugal dehydrator according to the present invention. The screen basket 15 is fixed on the vibration exciter shell 2 which can vibrate in the horizontal direction by a pair of bearings and bearing seats, the vibration exciter shell 2 is supported by a plurality of groups of water quality plate springs, the lower ends of the plate springs are supported on the excited device frame 1, springs which can vibrate horizontally and relatively are arranged on two sides of the vibration exciter shell 2, and the other ends of the springs are connected with the excited device frame 1.
As shown in fig. 2, the double-shaft inertia vibration exciter comprises a noncircular gear mechanism and a pair of synchronous cylindrical gears, wherein a rotary power source output shaft is connected with a driving noncircular gear 12 in the noncircular gear mechanism, a driven noncircular gear 24 in the noncircular gear mechanism is connected with a driving synchronous cylindrical gear 8 of the synchronous cylindrical gear pair, the driving synchronous cylindrical gear 8 and the driven synchronous cylindrical gear 3 have the same geometric parameters, two eccentric mass blocks are respectively and fixedly connected with the two synchronous cylindrical gears, and the two eccentric mass blocks are symmetrically arranged about a vertical bisector of a connecting line of rotation centers of the two eccentric mass blocks.
The centrifugal dewatering device mainly comprises a rotary power source, a gear mechanism and a main transmission rotating shaft, wherein the gear mechanism comprises a driving cylindrical gear 21 and a driven cylindrical gear 23, an output shaft of the rotary power source is connected with a rotating shaft four 22 through an elastic coupling 20, the rotating shaft four 22 is connected with the driving cylindrical gear 21, the driving cylindrical gear 21 is in meshing transmission with the driven cylindrical gear 23, the driven cylindrical gear 23 is connected with a rotating shaft five 13, and the rotating shaft five 13 inputs the power of the driven cylindrical gear 23 into the screen basket 15 through a thrust bearing 14.
The screen basket 15 is rigidly connected with the five rotating shafts 13, the feeding pipe 16 is fixed on the frame, a centrifugal liquid outlet 18 is arranged below the screen basket 15 close to one side of the five main transmission rotating shafts 13, and a discharge hole 17 is arranged below the screen basket 15 far away from one side of the five rotating shafts 13.
The double-shaft inertia vibration exciter and the centrifugal dewatering device are both rigidly fixed on an exciter shell 2 capable of vibrating in the horizontal direction through bolts, the exciter shell 2 is arranged on a spring capable of vibrating horizontally and relatively, and the spring is fixed on a frame of the horizontal vibration centrifugal dewatering machine.
The horizontal vibration centrifugal dehydrator adopts the cylindrical screen basket 15, and the speed in the axial direction is only related to the double-shaft inertia vibration exciter. The dehydration rate of the horizontal vibration centrifugal dehydrator is only related to the rotating speed of the screen basket, and the dehydration rate of the horizontal vibration centrifugal dehydrator can be effectively improved by changing the rotating speed. The productivity of the horizontal vibration centrifugal dehydrator is only related to the double-shaft inertia vibration exciter, and the productivity of the horizontal vibration centrifugal dehydrator can be effectively improved by changing the vibration of the double-shaft inertia vibration exciter.
The double-shaft inertia vibration exciter of the horizontal vibration centrifugal dehydrator receives the uniform rotation incoming, generates non-uniform rotation through the non-circular gear mechanism, and enables the eccentric mass block to generate asymmetric inertia force, so that the resultant force of the asymmetric inertia force and the friction force borne by the material is always along the side far away from the five 13 sides of the rotating shaft.
The principal resonant natural frequency of a vibrating system is generally taken to force the vibration frequency ω to be slightly less than the equivalent natural frequency ω of the system0Selecting ω ═ (0.85-0.9) ω0。
The efficiency of the horizontal vibration centrifugal dehydrator is determined by the asymmetric inertia force and the friction force of the materials. As the screen basket 15 rotates at high speed, the material is subjected to gravity, centrifugal force and positive pressure of the screen basket 15 against the material. Since the material is pressed tightly against the inner surface of the basket 15 by the high speed rotation, the gravity of the material is balanced in the radial component, the centrifugal force of the material and the positive pressure between the material and the inner surface of the basket 15. The material is subjected to inertial forces during movement and frictional forces between the material and the screen basket 15 in the axial direction.
For the double-shaft inertia vibration exciter, the period of the transmission ratio of the driven non-circular gear 24 relative to the driving non-circular gear 12 and the inertia force of the double-shaft inertia vibration exciter are related to the order of the non-circular gears, and in addition, the included angle between the long axis of the driven non-circular gear and the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block is also related to the included angle. Specifically, when the order of the pitch curve of the driven noncircular gear 24 in the noncircular gear mechanism is 1 and the long axis of the driven noncircular gear 24 is parallel to or perpendicular to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block, the modified double-shaft inertia vibration exciter can provide asymmetric inertia exciting force or enhanced symmetric inertia exciting force for the vibration machine.
Specifically, when the order of the pitch curve of the driven noncircular gear 24 in the noncircular gear mechanism is 1 and the long axis of the driven noncircular gear 24 is perpendicular to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block, the modified double-shaft inertia vibration exciter can provide enhanced symmetrical inertia vibration force for the vibration machine. The curve of the eccentric mass block corner and the exciting force of the modified symmetrical inertial vibration exciter is shown in figure 4. The rotation angle of the eccentric mass block of the modified reinforced symmetrical inertial vibration exciter and the exciting force are in periodic change, the period is 2 pi, the inertial exciting force is in a monotone increasing trend along with the increase of the rotation angle of the eccentric mass block along with the rotation angle of the eccentric mass block in the interval of 0-4 pi/5, and the inertial exciting force reaches the maximum when the rotation angle of the eccentric mass block is 4 pi/5. The rotation angle of the eccentric mass block is in the interval of 4 pi/5-pi, the inertial excitation force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is pi, the inertial excitation force disappears. The rotation angle of the eccentric mass block is in the interval of pi-6 pi/5, the inertial excitation force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 6 pi/5, the inertial excitation force reaches the maximum reversal. The rotation angle of the eccentric mass block is in the interval of 6 pi/5-2 pi, the inertia exciting force is in a monotonous increasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 2 pi, the inertia exciting force disappears. The maximum exciting force of the reinforced symmetric inertial vibration exciter is about 4 times of the maximum exciting force of the traditional double-shaft inertial vibration exciter. Therefore, the excitation force of the modified double-shaft inertia vibration exciter is greatly increased, and the enhanced symmetrical inertia excitation force, namely the simple resonance inertia excitation force, can be provided for the vibration machinery, so that the efficiency and the performance of the vibration machinery are improved.
When the order of the pitch curve of the driven noncircular gear 24 in the noncircular gear mechanism is 1 and the long axis of the driven noncircular gear 24 is parallel to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block, the modified double-shaft inertia vibration exciter can provide asymmetric inertia exciting force for a vibration machine. The curve of the corner and the exciting force of the eccentric mass block of the modified asymmetric inertial vibration exciter is shown in figure 5. The rotation angle and the exciting force of the eccentric mass block of the modified asymmetric inertial vibration exciter are in periodic change, the period is 2 pi, the inertial exciting force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block along with the rotation angle of the eccentric mass block within the interval of 0-3 pi/5, and when the rotation angle of the eccentric mass block is 3 pi/5, the inertial exciting force reaches the minimum. The rotation angle of the eccentric mass block is in the interval of 3 pi/5-pi, the inertia exciting force is in a monotonous increasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is pi, the inertia exciting force reaches the maximum. The rotation angle of the eccentric mass block is in the interval of pi-7 pi/5, the inertial excitation force is in a monotonous decreasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 7 pi/5, the inertial excitation force reaches the maximum reversal. The rotation angle of the eccentric mass block is in the interval of 7 pi/5-2 pi, the inertia exciting force is in a monotonous increasing trend along with the increase of the rotation angle of the eccentric mass block, and when the rotation angle of the eccentric mass block is 2 pi, the inertia exciting force disappears. The maximum forward exciting force of the modified asymmetric inertial vibration exciter is about 3 times of the maximum reverse exciting force.
In the embodiment of the invention, the order of the driving non-circular gear 12 and the driven non-circular gear 24 is 1, so that the alternating phenomenon of forward movement and backward movement of the system for multiple times is avoided. Under the high-speed rotation of screen basket 15, avoided the phenomenon of beating of material, can effectual realization dehydration process.
When the rotation speed of the screen basket 15 is low, the material is subjected to a small centrifugal force, and the radial component force of the material is still balanced, namely the material is subjected to a smaller positive pressure. At the moment, the friction force between the screen basket 15 and the material is small, and the material can slide in a forward direction, a static direction and a reverse direction under the action of the asymmetric inertia exciting force of the double-shaft inertia vibration exciter in the axis direction. The reverse sliding can increase the abrasion of the screen and reduce the dehydration efficiency of the horizontal vibration centrifugal dehydrator.
When the basket 15 rotates too fast, the material is subjected to a large centrifugal force, and the radial component forces of the material are still balanced, i.e. the material is subjected to a large positive pressure, and the friction between the basket 15 and the material is large. Although the double-shaft inertia vibration exciter still provides asymmetric inertia exciting force in the axial direction, the materials are kept static due to the large damping between the screen basket 15 and the materials, and the horizontal vibration centrifugal dehydrator cannot discharge the materials.
The friction between the screen basket 15 and the material is related to the friction coefficient between them and the rotation speed of the screen basket 15. The friction coefficient between the inner wall of the screen basket 15 and the material is not easy to change. The rotating speed of the screen basket 15 can only be changed in order to adjust the friction force between the screen basket 15 and the materials, namely the rotating speed of the screen basket and the exciting force of the double-shaft inertia vibration exciter are reasonably selected, the reverse sliding and the jumping of the materials are avoided, and the dehydration efficiency of the horizontal vibration centrifugal dehydrator is effectively improved.
In the embodiment, the rotating speeds of the motors of the primary vibration exciter and the secondary vibration exciter are adjusted, so that the sliding friction force of the material in the operation process is smaller than the maximum asymmetric inertia force of forward movement and larger than the maximum asymmetric inertia force of backward movement, the material is always in a static state and a forward movement state in the operation process, the reverse sliding and jumping of the material are eliminated, and the dehydration efficiency of the horizontal vibration centrifugal dehydrator is effectively improved.
The specific working principle of the embodiment is as follows:
and (3) centrifugal dehydration process: the material enters the feed pipe 16 from the top of the feed pipe 16 and automatically slides down to the outlet of the feed pipe 16 into the screen basket 15. The screen rotates along the rotating shaft five 13 under the rotation of the screen basket 15. After falling into the screen mesh, the material is tightly attached to the inner surface of the screen basket 15 under the action of centrifugal force. The moisture of the material is thrown out through the holes on the surface of the screen basket 15 under the action of centrifugal force, and the thrown moisture freely slides along the inner wall of the shell of the horizontal vibration centrifugal dehydrator and is finally discharged from the centrifugate outlet 18, so that the centrifugal dehydration process is completed.
A discharging process: under the action of the asymmetric exciting force of the double-shaft inertia vibration exciter, the materials uniformly move along the inner surface of the cylindrical screen basket 15 to the screen basket 15 far away from the five-side rotating shaft 13, the materials are finally thrown out from the outlet of the screen basket 15, the thrown materials freely slide along the inner wall of the shell of the horizontal vibration centrifugal dehydrator, and finally are discharged from the discharge port 17, so that the material discharging process is completed.
The transmission mechanism of the horizontal vibration centrifugal dehydrator enables the screen basket 15 to rotate around the five moving shafts 13 and to vibrate axially through the vibrating body component, so that the dehydration effect of materials is enhanced, and the materials on the screen surface are promoted to move forwards. When the material layer is shaking, the filter surface is cleaned, the screen surface is prevented from being blocked, and the abrasion of the material to the screen surface is reduced.
Claims (7)
1. A horizontal vibration centrifugal dehydrator comprises a rotary power source, a double-shaft inertia vibration exciter and a centrifugal dehydrating device, wherein the rotary power source drives the centrifugal dehydrating device to carry out centrifugal dehydrating treatment on materials; all the eccentric mechanisms are uniformly distributed on a plane; the eccentric mechanism comprises an eccentric mass block rotating around a rotating shaft; the rotating power source drives the eccentric mass block to rotate around the rotating shaft through the circular gear transmission mechanism; the rotating speeds of the eccentric mass blocks are consistent, and the component force of the resultant force of the eccentric forces generated by the eccentric mass blocks on a plane is 0; the method is characterized in that: replacing a circular gear transmission mechanism with a non-circular gear mechanism; the rotary power source is driven by the non-circular gear mechanism to drive the eccentric mass block to rotate around the rotating shaft; the non-circular gear mechanism comprises a driving non-circular gear and a driven non-circular gear, wherein the driving non-circular gear is directly or indirectly driven by a rotary power source, and the driven non-circular gear and the eccentric mass block are coaxially arranged and drive the eccentric mass block to rotate.
2. The horizontal vibration centrifugal dehydrator according to claim 1, wherein: the non-circular gear mechanism comprises one or more pairs of non-circular gears, and gear teeth of the two non-circular gears which are in contact are meshed with each other.
3. The horizontal vibration centrifugal dehydrator according to claim 1 or 2, wherein: the order of the pitch curve of the driven non-circular gear is 1, and the long axis of the driven non-circular gear is parallel or vertical to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block.
4. The horizontal vibration centrifugal dehydrator according to claim 1 or 2, wherein: the order of a pitch curve of the driven non-circular gear in the non-circular gear mechanism is 2, and the long axis of the driven non-circular gear is parallel or vertical to the connecting line of the rotation center of the eccentric mass block and the mass center of the eccentric mass block.
5. The horizontal vibration centrifugal dehydrator according to claim 1, wherein: the centrifugal dehydration device comprises a screen basket which is a revolving body and a feeding pipe; the feeding pipe is fixed on the rack, an outlet of the feeding pipe extends into the screen basket, and the screen basket is driven by the rotary power source to rotate.
6. The horizontal vibration centrifugal dehydrator according to claim 5, wherein: the rotary power source is a motor, a rotating shaft of the motor is connected with a rotating shaft four-purpose elastic coupling, a driving cylindrical gear is connected to a spline on the rotating shaft four, the driving cylindrical gear is meshed with a driven cylindrical gear, the driven cylindrical gear is connected to a rotating shaft five through a spline, and the rotating shaft five penetrates through a thrust bearing on the vibration exciter shell and is rigidly connected with the screen basket.
7. The horizontal vibration centrifugal dehydrator according to claim 1, wherein: the double-shaft inertia vibration exciter is rigidly fixed on an exciter shell capable of vibrating in the horizontal direction through bolts, and the exciter shell is connected with the excited device frame through a spring.
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| CN202350435U (en) * | 2011-10-21 | 2012-07-25 | 山东高新机械设备有限公司 | Horizontal type vibrating centrifugal dehydrator with polyester spring for transmitting exciting force |
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Effective date of registration: 20201215 Address after: Room 1518, 15 / F, investment building, 1757 Tushan East Road, Bengbu City, Anhui Province Patentee after: Bengbu Jingtu Intelligent Technology Co., Ltd Address before: 066004 No. 438 west section of Hebei Avenue, seaport District, Hebei, Qinhuangdao Patentee before: Yanshan University |