CN204620400U - The drive unit of rotary flat classification screen balance of shaking force - Google Patents

Abstract

The utility model relates to the drive unit of rotary flat classification screen balance of shaking force.Power shaft is installed in rotation on the radial axle bore on gear-box cylinder lateral wall, and drive bevel gear is fixedly mounted on power shaft the inner; Main shaft is vertically arranged on gear-box cylindrical shell axial centre, and main shaft is installed in rotation on gear-box top cover and gear-box base; Secondary counterweight pallet is installed in rotation on main shaft bottom, and lower driven wheel of differential is arranged on secondary counterweight tray top, and lower driven wheel of differential is meshed with drive bevel gear lower edge, and secondary counterweight is fixedly mounted on secondary counterweight pallet; Main counterweight tray sleeve is contained in main shaft top and is fixedly connected with main shaft, and upper driven wheel of differential is arranged on main counterweight tray bottom, and upper driven wheel of differential is meshed with the upper edge of drive bevel gear, and main counterweight is fixedly mounted on main counterweight pallet; Gear-box top cover is stretched out and setting-up eccentricity axle in main shaft upper end.The utility model can reduce vibration in rotary flat classification screen operation process and power attenuation, improves screening efficiency.

Description

The drive unit of rotary flat classification screen balance of shaking force

Technical field

The utility model relates to a kind of for the industry Raws such as grain, food, feed and the screening of finished product, the rotary flat classification screen of graded operation, the specifically drive unit of rotary flat classification screen balance of shaking force.

Background technology

Rotary flat classification screen is widely used in screening, the graded operation of the industry Raws such as grain, food, feed and finished product, especially screening and the classification of feed factory granular material or pellet is usually used in, also can be used for the clearly first of feed factory raw material, and the classification of intermediate products after separating twice.

As shown in Figure 1, it forms primarily of support, bracket II, sieve ship III, suspension arrangement V, drive unit I and tail support device IV structure of existing rotary flat classification screen.Bracket II hangs on support by four suspension arrangements V or on factory building crossbeam, the feed end of sieve ship III is slightly high to be supported on drive unit I, makes to form sieve ship III inclined angle alpha between sieve ship III and horizontal plane, rearwardly moves in order to material.The discharge end of sieve ship III is slightly low to be supported in frame by tail support device IV.Crank established by drive unit I, can around System of Rotating about Fixed Axis; Tail support device IV is supported by elastic plate, and sieve ship III afterbody can move along sieve nest length direction.After input power, crank handle turns sieve ship III moves with the form of slider-crank mechanism, now sieves ship III its movement locus from feed end to discharge end and becomes elliptic motion gradually by horizontal circular movement, finally become approximate linear reciprocating motion.

During concrete use, material enters sieve ship III from charging aperture, under the effect of sieve ship III feed end circular motion, be evenly distributed in rapidly on whole compass screen surface width, and produce automatic classification, the material that below the bed of material, granularity is less sieves rapidly, and namely the material that granularity is larger above then moves to discharge end along sieve ship III inclined-plane to lower end.Be approximate linear reciprocating motion in the motion of discharge end sieve ship III, screen effect is weakened gradually, thus make the particle being greater than screen size be rapidly to Way out to move, until outside discharge machine, complete the whole screening of material.

Revolution classifying screen is belt transmission, single counterweight block structure mostly at present, because inertia force can not complete equipilibrium, have the following disadvantages: 1, the vibration of large-scale classifying screen is large, when multiple classifying screen is installed side by side with floor, to underframe and the installation foundation formation impact of classifying screen, large on factory building impact; 2, drive unit I and underframe are followed sieve ship III and are rocked, and increase energy ezpenditure, reduce the absolute acceleration of sieve ship III horizontal plane motion, be unfavorable for screening.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of drive unit of rotary flat classification screen balance of shaking force is provided, its smart structural design is reasonable, the centrifugal force that main counterweight and secondary counterweight can be made to produce just in time balances each other with the inertia force of sieve ship life, reduce the vibration in rotary flat classification screen operation process and power attenuation, improve screening efficiency.

Technical scheme according to the utility model provides: the drive unit of rotary flat classification screen balance of shaking force, is characterized in that: comprise eccentric shaft, gear-box top cover, gear-box cylindrical shell, power shaft, drive bevel gear, upper driven wheel of differential, lower driven wheel of differential, secondary counterweight pallet, gear-box base, main shaft, main counterweight pallet, secondary counterweight and main counterweight; The sidewall of described gear-box cylindrical shell is provided with the radial axle bore for installing power shaft, and described power shaft is supported by power shaft sealed rotational supporting component and is arranged in radial axle bore, and described drive bevel gear is fixedly mounted on power shaft the inner; Described main shaft is vertically arranged on the axial centre position of gear-box cylindrical shell, the top fixed installation gear-box top cover of gear-box cylindrical shell, the bottom fixed installation gear-box base of gear-box cylindrical shell, described main shaft upper end is supported by sealed rotational supporting component on main shaft and is arranged on gear-box top cover, and main shaft lower end is arranged on gear-box base by main shaft lower seal rotational support modular support; Described secondary counterweight pallet is arranged on main shaft bottom by secondary pallet rotational support modular support, can relatively rotate between secondary counterweight pallet and main shaft, described lower driven wheel of differential is arranged on secondary counterweight tray top by connecting bolt, the flank of tooth of lower driven wheel of differential upwards, lower driven wheel of differential is meshed with the lower edge of drive bevel gear, and described secondary counterweight is fixedly mounted on secondary counterweight pallet; Described main counterweight tray sleeve is contained in main shaft top and is fixedly connected with main shaft, described upper driven wheel of differential is arranged on main counterweight tray bottom by connecting bolt, the flank of tooth of upper driven wheel of differential is downward, upper driven wheel of differential is meshed with the upper edge of drive bevel gear, and described main counterweight is fixedly mounted on main counterweight pallet; Described main shaft upper end is stretched out gear-box top cover and fixedly mounts eccentric shaft.

As further improvement of the utility model, described main shaft top is provided with support level, described main counterweight tray sleeve is contained on main shaft, along being supported on support level under main counterweight pallet endoporus, main counterweight pallet endoporus upper end is built with expansion sleeve, and main counterweight pallet is fixedly connected with by expansion sleeve with between main shaft.

As further improvement of the utility model, described power shaft sealed rotational supporting component comprises the second bearing gland, the second bearing, the 3rd bearing, the second sealing ring and the 3rd sealing ring, described second bearing holder (housing, cover) is contained on the axle journal of power shaft outer end, on the support installed surface that second bearing supporting is arranged on radial axle bore outer end and by the second bearing gland encapsulation, second bearing gland is fixedly connected with gear-box cylindrical shell, and the second bearing gland is built with the second sealing ring; Described 3rd bearing holder (housing, cover) is contained on the axle journal of power shaft the inner, and the 3rd bearing supporting is arranged on the support installed surface of radial axle bore the inner, is provided with the 3rd sealing ring between radial axle bore the inner and power shaft.

As further improvement of the utility model, described second bearing is single-row tapered roller bearing, and described 3rd bearing is deep groove ball bearing.

As further improvement of the utility model, on described main shaft, sealed rotational supporting component comprises clutch shaft bearing gland, clutch shaft bearing and the first sealing ring, described clutch shaft bearing is sleeved on the axle journal of main shaft upper end, encapsulated by clutch shaft bearing gland in the support installing hole that clutch shaft bearing supporting is arranged on gear-box top cover, clutch shaft bearing gland is fixedly connected with gear-box top cover, and the first sealing ring is all equipped with in clutch shaft bearing gland and the endoporus lower end of gear-box top cover.

As further improvement of the utility model, described clutch shaft bearing is double-row self-aligning roller bearing.

As further improvement of the utility model, described main shaft lower seal rotational support assembly comprises the 3rd bearing gland and the 5th bearing, described 5th bearing holder (housing, cover) is contained on the axle journal of main shaft lower end, in the support installing hole that 5th bearing supporting is arranged on gear-box base and by the 3rd bearing gland encapsulation, the 3rd bearing gland is fixedly connected with gear-box base.

As further improvement of the utility model, described 5th bearing is single-row tapered roller bearing.

As further improvement of the utility model, described secondary counterweight pallet rotational support assembly comprises two the 4th bearings, and two the 4th bearings are arranged on the upper and lower side of secondary counterweight pallet endoporus respectively; The support level that 4th bearing inner race of upper end is provided with by main shaft bottom is spacing, and the 4th bearing outer ring of upper end is spacing by lower driven wheel of differential; Press contacts is pushed up with sleeve upper end, sleeve lower end and main shaft lower seal rotational support assembly top press contacts on the downside of 4th bearing inner race of lower end; Described 4th bearing is deep groove ball bearing.

As further improvement of the utility model, described main shaft upper end is stretched out the part suit half a coupler of gear-box top cover and is locked with jump ring, and half a coupler is fixedly connected with by the first key with main shaft; Described eccentric shaft to be placed on half a coupler and to be fixedly connected with half a coupler.

The utility model compared with prior art, has the following advantages:

(1) smart structural design of the present utility model is reasonable, the centrifugal force that main counterweight and secondary counterweight can be made to produce just in time balances each other with the inertia force of sieve ship life, the out-of-balance force of all directions in active balance sieve ship motion process, reduce the vibration in rotary flat classification screen operation process and power attenuation, improve screening efficiency.

(2) bracket can directly be installed on ground without the need to erecting by overhang, without the need to frame (or sling point), reduces making and installation cost.

(3) the utility model with the existing rotary flat classification screen speed of mainshaft, eccentric throw, when sieve captain's degree inclination angle is identical, the horizontal acceleration of compass screen surface is large, is beneficial to screening.

Accompanying drawing explanation

Fig. 1 is rotary flat classification screen structural representation.

Fig. 2 is the axis side views such as the partial cutaway of the utility model embodiment drive unit.

Fig. 3 is the utility model embodiment drive unit complete section front view.

Fig. 4 is the top view that gear-box top cover removed by the utility model embodiment drive unit.

Fig. 5 is the partial cutaway left view of the utility model embodiment drive unit.

Fig. 6 is the structure Simplified analysis figure of the rotary flat classification screen of application the utility model drive unit.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model is described further.

As shown in the figure, the drive unit of the rotary flat classification screen balance of shaking force in embodiment is primarily of eccentric shaft 1, half a coupler 2, clutch shaft bearing gland 3a, second bearing gland 3b, 3rd bearing gland 3c, gear-box top cover 4, gear-box cylindrical shell 5, clutch shaft bearing 6a, second bearing 6b, 3rd bearing 6c, 4th bearing 6d, 5th bearing 6e, first sealing ring 7a, second sealing ring 7b, 3rd sealing ring 7c, power shaft 8, first key 9a, second key 9b, drive bevel gear 10, upper driven wheel of differential 11a, lower driven wheel of differential 11b, sleeve 12, secondary counterweight pallet 13, gear-box base 14, main shaft 15, main counterweight pallet 16, expansion sleeve 17, jump ring 18, the secondary composition such as counterweight 19 and main counterweight 20.

As shown in Fig. 2 ~ Fig. 5, the sidewall of described gear-box cylindrical shell 5 is provided with the radial axle bore for installing power shaft 8, described power shaft 8 is supported by power shaft sealed rotational supporting component and is arranged in radial axle bore, and it is inner that described drive bevel gear 10 is fixedly mounted on power shaft 8 by the second key 9b; Described main shaft 15 is vertically arranged on the axial centre position of gear-box cylindrical shell 5, the top fixed installation gear-box top cover 4 of gear-box cylindrical shell 5, the bottom fixed installation gear-box base 14 of gear-box cylindrical shell 5, described main shaft 15 upper end is supported by sealed rotational supporting component on main shaft and is arranged on gear-box top cover 4, and main shaft 15 lower end is arranged on gear-box base 14 by main shaft lower seal rotational support modular support; Described secondary counterweight pallet 13 is arranged on main shaft 15 bottom by secondary counterweight pallet rotational support modular support, can relatively rotate between secondary counterweight pallet 13 and main shaft 15, described lower driven wheel of differential 11b is arranged on secondary counterweight pallet 13 top by connecting bolt, the flank of tooth of lower driven wheel of differential 11b upwards, lower driven wheel of differential 11b is meshed with the lower edge of drive bevel gear 10, and described secondary counterweight 19 is fixedly mounted on secondary counterweight pallet 13; Described main counterweight pallet 16 is sleeved on main shaft 15 top and is fixedly connected with main shaft 15, described upper driven wheel of differential 11a is arranged on bottom main counterweight pallet 16 by connecting bolt, the flank of tooth of upper driven wheel of differential 11a is downward, upper driven wheel of differential 11a is meshed with the upper edge of drive bevel gear 10, and described main counterweight 20 is fixedly mounted on main counterweight pallet 16; Described main shaft 15 upper end is stretched out gear-box top cover 4 and fixedly mounts eccentric shaft 1.

As shown in Fig. 2 ~ Fig. 5, in the utility model embodiment, described main shaft 15 top is provided with support level, described main counterweight pallet 16 is sleeved on main shaft 15, along being supported on support level under main counterweight pallet 16 endoporus, main counterweight pallet 16 endoporus upper end is built with expansion sleeve 18, and main counterweight pallet 16 is fixedly connected with by expansion sleeve 18 with between main shaft 15.

In the utility model embodiment, the structure of described power shaft sealed rotational supporting component as shown in Figure 2 and Figure 3, it forms primarily of the second bearing gland 3b, the second bearing 6b, the 3rd bearing 6c, the second sealing ring 7b and the 3rd sealing ring 7c, described second bearing 6b is sleeved on the axle journal of power shaft 8 outer end, the support installed surface that second bearing 6b supporting is arranged on radial axle bore outer end is encapsulated by the second bearing gland 3b, second bearing gland 3b is fixedly connected with gear-box cylindrical shell 5, and the second bearing gland 3b is built with the second sealing ring 7b; Described 3rd bearing 6c is sleeved on the axle journal of power shaft 8 the inner, and the 3rd bearing 6c supporting is arranged on the support installed surface of radial axle bore the inner, is provided with the 3rd sealing ring 7c between radial axle bore the inner and power shaft 8.In illustrated embodiment, described second bearing 6b is single-row tapered roller bearing, and described 3rd bearing 6c is deep groove ball bearing.

In the utility model embodiment, on described main shaft, the structure of sealed rotational supporting component as shown in Figure 2 and Figure 3, it forms primarily of clutch shaft bearing 6a gland 3a, clutch shaft bearing 6a and the first sealing ring 7a, described clutch shaft bearing 6a is sleeved on the axle journal of main shaft 15 upper end, encapsulated by clutch shaft bearing 6a gland 3a in the support installing hole that clutch shaft bearing 6a supporting is arranged on gear-box top cover 4, clutch shaft bearing 6a gland 3a is fixedly connected with gear-box top cover 4, and the first sealing ring 7a is all equipped with in clutch shaft bearing 6a gland 3a and the endoporus lower end of gear-box top cover 4.Described clutch shaft bearing 6a is double-row self-aligning roller bearing.

In the utility model embodiment, the structure of described main shaft lower seal rotational support assembly as shown in Figure 2 and Figure 3, it forms primarily of the 3rd bearing gland 3c and the 5th bearing 6e, described 5th bearing 6e is sleeved on the axle journal of main shaft 15 lower end, encapsulated by the 3rd bearing gland 3c in the support installing hole that 5th bearing 6e supporting is arranged on gear-box base 14, the 3rd bearing gland 3c is fixedly connected with gear-box base 14.Described 5th bearing 6e is single-row tapered roller bearing.

In the utility model embodiment, as shown in Figure 2 and Figure 3, it mainly comprises two the 4th bearing 6d to the structure of described secondary counterweight pallet rotational support assembly, and two the 4th bearing 6d are arranged on the upper and lower side of secondary counterweight pallet 13 endoporus respectively; The support level that 4th bearing 6d inner ring of upper end is provided with by main shaft 15 bottom is spacing, and the 4th bearing 6d outer ring of upper end is spacing by lower driven wheel of differential 11b; Push up press contacts with sleeve 12 upper end on the downside of 4th bearing 6d inner ring of lower end, sleeve 12 lower end and main shaft lower seal rotational support assembly top press contacts, described 4th bearing 6d is deep groove ball bearing.

In the utility model embodiment, the fixed structure of eccentric shaft 1 and main shaft 15 as shown in Figure 2 and Figure 3, described main shaft 15 upper end is stretched out the part suit half a coupler 2 of gear-box top cover 4 and is locked with jump ring 18, and half a coupler 2 is fixedly connected with by the first key 9a with main shaft 15; Described eccentric shaft 1 to be placed on half a coupler 2 and to be fixedly connected with half a coupler 2.

The course of work of the present utility model and operation principle as follows:

1, original state: main counterweight 20 barycenter and eccentric shaft 1 free end shaft wire-wound main shaft 15 axis phase 180 °, main counterweight 20, secondary counterweight 19 can overlap on the length direction of sieve ship III.

2, motion state: reducing motor direct connection or motor add one-level belt transmission, the power shaft 8 of power by drive unit I is inputted, drive bevel gear 10 by with power shaft 8 coaxial rotation, rotary motion is delivered to upper driven wheel of differential 11a, lower driven wheel of differential 11b by drive bevel gear 10 respectively.Such rotary motion is just divided into two-way: a road drives connected main counterweight pallet 16 by upper driven wheel of differential 11a, and main counterweight pallet 16 drives main shaft 15, and main shaft 15 drives half a coupler 2 and eccentric shaft 1; Another road drives secondary counterweight pallet 13 by lower driven wheel of differential 11b.Main like this counterweight pallet 16, secondary counterweight pallet 13 just drive main counterweight 20, secondary counterweight 19 to make coaxial oppositely constant speed rotation around main shaft 15 respectively, main counterweight 20 and secondary counterweight 19 produce the major-minor centrifugal force perpendicular to main shaft 15 axis direction, and eccentric shaft 1 drives sieve ship III to move.

The analysis of balance theory aspect is carried out to the utility model below.

Step 1, structure simplify:

As shown in Fig. 1, Fig. 6, according to the feature that gyration done by sieve ship III feed end, discharge end makes approximate straight line motion of rotary flat classification screen, rotary flat classification screen is reduced to slider-crank mechanism; Wherein, A point is considered as main shaft 15 pivot, and AB is considered as eccentric shaft 1 crank, and r is crank radius of turn, and B point is considered as eccentric shaft 1 and sieve ship III pin joint, and C point is considered as sieve ship III afterbody rectilinear motion point, (K ₁, m ₁), (K ₂, m ₂), (K ₃, m ₃) being respectively main counterweight 20, secondary counterweight 19, the barycenter sieving ship III and quality, w is main shaft 15 constant speed rotation angular speed counterclockwise.

Step 2, sieve ship III inertia force and centrifugal force calculate:

2.1. sieve ship III inertia force to calculate:

By m ₃be decomposed into m _3Band m _3C:

$m_{3B}=m_3\×\frac{l_{\mathrm{CK}3}}{l_{\mathrm{BC}}},m_{3C}=m_3\×\frac{l_{\mathrm{BK}3}}{l_{\mathrm{BC}}};$

Calculate acceleration and x, y direction inertia force of B point:

a _B＝rw ²； $\left\{\begin{array}{c}{F}_{\mathrm{Bx}}=m_{3B}{a}_B\cos \mathrm{\α}=m_3\frac{l_{\mathrm{CK}3}}{l_{\mathrm{BC}}}{\mathrm{rw}}^2\cos \mathrm{\α}\\ F_{\mathrm{By}}=m_{3B}{a}_B\sin \mathrm{\α}=m_3\frac{l_{\mathrm{CK}3}}{l_{\mathrm{BC}}}{\mathrm{rw}}^2\sin \mathrm{\α}\end{array}\right.;$

Calculate acceleration and x, y direction inertia force of C point:

a _C≈-rw ²cosα； $\left\{\begin{array}{c}{F}_{\mathrm{Cx}}=-m_{3C}{a}_C=m_3\frac{l_{\mathrm{BK}3}}{l_{\mathrm{BC}}}{\mathrm{rw}}^2\cos \mathrm{\α}\\ F_{\mathrm{Cy}}=O\end{array}\right.;$

2.2. balance weight centrifugal power calculates:

K ₁point acceleration and x, y direction centrifugal force:

a _K1＝l _AK1w ²；

K ₂point acceleration and x, y direction centrifugal force:

a _K2＝l _AK2w ²；

If 2.3. sieve nest balance, then:

$\left\{\begin{array}{c}\mathrm{\Σ}{F}_x=0\\ \mathrm{\Σ}{F}_y=0\end{array}\right.\⇒\left\{\begin{array}{c}{F}_{\mathrm{Bx}}+F_{\mathrm{Cx}}+F_{K1x}+F_{K2x}=0\\ F_{\mathrm{By}}+F_{\mathrm{Cy}}+F_{K1y}+F_{K2y}=0\end{array}\right.\⇒\left\{\begin{array}{c}{m}_1{l}_{\mathrm{AK}1}=\frac{m_{3}r}{2}(1+\frac{l_{\mathrm{CK}3}}{l_{\mathrm{BC}}})\\ m_2{l}_{\mathrm{AK}2}=\frac{m_{3}r}{2}(1-\frac{l_{\mathrm{CK}3}}{l_{\mathrm{BC}}})\end{array};\right.$

From above formula: when main counterweight 20 mass-radius product is secondary counterweight 19 mass-radius product is time, sieve nest is in poised state.

Claims (10)

1. the drive unit of rotary flat classification screen balance of shaking force, is characterized in that: comprise eccentric shaft (1), gear-box top cover (4), gear-box cylindrical shell (5), power shaft (8), drive bevel gear (10), upper driven wheel of differential (11a), lower driven wheel of differential (11b), secondary counterweight pallet (13), gear-box base (14), main shaft (15), main counterweight pallet (16), expansion sleeve (17), secondary counterweight (19) and main counterweight (20); The sidewall of described gear-box cylindrical shell (5) is provided with the radial axle bore for installing power shaft (8), described power shaft (8) is supported by power shaft sealed rotational supporting component and is arranged in radial axle bore, and it is inner that described drive bevel gear (10) is fixedly mounted on power shaft (8); Described main shaft (15) is vertically arranged on the axial centre position of gear-box cylindrical shell (5), top fixed installation gear-box top cover (4) of gear-box cylindrical shell (5), bottom fixed installation gear-box base (14) of gear-box cylindrical shell (5), described main shaft (15) upper end is supported by sealed rotational supporting component on main shaft and is arranged on gear-box top cover (4), and main shaft (15) lower end is arranged on gear-box base (14) by main shaft lower seal rotational support modular support; Described secondary counterweight pallet (13) is arranged on main shaft (15) bottom by secondary pallet rotational support modular support, can relatively rotate between secondary counterweight pallet (13) and main shaft (15), described lower driven wheel of differential (11b) is arranged on secondary counterweight pallet (13) top by connecting bolt, the flank of tooth of lower driven wheel of differential (11b) upwards, lower driven wheel of differential (11b) is meshed with the lower edge of drive bevel gear (10), and described secondary counterweight (19) is fixedly mounted on secondary counterweight pallet (13); Described main counterweight pallet (16) is sleeved on main shaft (15) top and is fixedly connected with main shaft (15), described upper driven wheel of differential (11a) is arranged on main counterweight pallet (16) bottom by connecting bolt, the flank of tooth of upper driven wheel of differential (11a) is downward, upper driven wheel of differential (11a) is meshed with the upper edge of drive bevel gear (10), and described main counterweight (20) is fixedly mounted on main counterweight pallet (16); Described main shaft (15) upper end is stretched out gear-box top cover (4) and is fixedly mounted eccentric shaft (1).

2. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: described main shaft (15) top is provided with support level, described main counterweight pallet (16) is sleeved on main shaft (15), along being supported on support level under main counterweight pallet (16) endoporus, main counterweight pallet (16) endoporus upper end is built with expansion sleeve (18), and main counterweight pallet (16) is fixedly connected with by expansion sleeve (18) with between main shaft (15).

3. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: described power shaft sealed rotational supporting component comprises the second bearing gland (3b), second bearing (6b), 3rd bearing (6c), second sealing ring (7b) and the 3rd sealing ring (7c), described second bearing (6b) is sleeved on the axle journal of power shaft (8) outer end, the support installed surface that second bearing (6b) supporting is arranged on radial axle bore outer end is encapsulated by the second bearing gland (3b), second bearing gland (3b) is fixedly connected with gear-box cylindrical shell (5), second bearing gland (3b) is built with the second sealing ring (7b), described 3rd bearing (6c) is sleeved on the inner axle journal of power shaft (8), and the 3rd bearing (6c) supporting is arranged on the support installed surface of radial axle bore the inner, is provided with the 3rd sealing ring (7c) between radial axle bore the inner and power shaft (8).

4. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 3, it is characterized in that: described second bearing (6b) is single-row tapered roller bearing, described 3rd bearing (6c) is deep groove ball bearing.

5. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: on described main shaft, sealed rotational supporting component comprises clutch shaft bearing gland (3a), clutch shaft bearing (6a) and the first sealing ring (7a), described clutch shaft bearing (6a) is sleeved on the axle journal of main shaft (15) upper end, the support installing hole that clutch shaft bearing (6a) supporting is arranged on gear-box top cover (4) is interior also by clutch shaft bearing gland (3a) encapsulation, clutch shaft bearing gland (3a) is fixedly connected with gear-box top cover (4), the first sealing ring (7a) is all equipped with in clutch shaft bearing gland (3a) and the endoporus lower end of gear-box top cover (4).

6. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 5, is characterized in that: described clutch shaft bearing (6a) is double-row self-aligning roller bearing.

7. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: described main shaft lower seal rotational support assembly comprises the 3rd bearing gland (3c) and the 5th bearing (6e), described 5th bearing (6e) is sleeved on the axle journal of main shaft (15) lower end, the support installing hole that 5th bearing (6e) supporting is arranged on gear-box base (14) is interior also by the 3rd bearing gland (3c) encapsulation, and the 3rd bearing gland (3c) is fixedly connected with gear-box base (14).

8. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 7, is characterized in that: described 5th bearing (6e) is single-row tapered roller bearing.

9. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: described secondary counterweight pallet rotational support assembly comprises two the 4th bearings (6d), and two the 4th bearings (6d) are arranged on the upper and lower side of secondary counterweight pallet (13) endoporus respectively; The support level that 4th bearing (6d) inner ring of upper end is provided with by main shaft (15) bottom is spacing, and the 4th bearing (6d) outer ring of upper end is spacing by lower driven wheel of differential (11b); Press contacts is pushed up with sleeve (12) upper end, sleeve (12) lower end and main shaft lower seal rotational support assembly top press contacts on the downside of 4th bearing (6d) inner ring of lower end; Described 4th bearing (6d) is deep groove ball bearing.

10. the drive unit of rotary flat classification screen balance of shaking force as claimed in claim 1, it is characterized in that: described main shaft (15) upper end is stretched out part suit half a coupler (2) of gear-box top cover (4) and locked with jump ring (18), and half a coupler (2) is fixedly connected with by the first key (9a) with main shaft (15); Described eccentric shaft (1) is placed in half a coupler (2) and goes up and be fixedly connected with half a coupler (2).