CN2063443U - Forcing aid for dump machinery of mixer with single horizontal shaft - Google Patents

Abstract

The utility model relates to a boosting device for a tipping and shedding mechanism of a single-horizontal-shaft stirrer, and is suitable for a concrete stirrer, a mortar stirrer and a material stirrer. The boosting device is a coaxial gear box which is arranged in a main transmission system. Because the box body of the coaxial gear box is rigidly fixed on a stirring cylinder, the reaction torque born by the box body in work is passed to the stirring cylinder, which changes the stress state of the stirring cylinder so that the torque needed by a cylindrical body to be tipped over is largely reduced, the load on the mechanism is eased, and energy consumption is decreased.

Description

Forcing aid for dump machinery of mixer with single horizontal shaft

The utility model relates to the shedding mechanism of tumbling of various forced action type list horizontal axis mixers (as concrete, mortar, material mixer), is the power assisting device of shedding mechanism of tumbling.

Existing forced action type list horizontal axis mixer, its mixing drum is bearing on the bearing at two ends, engaging clutch during discharging, the shedding mechanism of tumbling is drawn the power drive cylindrical shell from shaft and is tumbled around the bearing rotation, and meanwhile shaft is rotated further material is transferred to.The shedding mechanism of tumbling drives cylindrical shell and rotates the moment of resistance that must overcome following two aspects:

Σ M _i--the frictional resistance moment of cartridge mount, the algebraical sum of the eccentric moment of inertia resistance square, material.

M ₂--material is to the moment of friction of cylindrical shell, and quantitatively the load with shaft is identical, but direction is opposite.

Disregarding the moment of resistance of tumbling under the situation of transmission efficiency be:

M ₂＋ΣM _i

Suppose: Σ M _i=EM ₂

The power that cylindrical shell consumed of then tumbling specially is N _f

N _f= c(M ₂+ΣM ₁)n ₃= (1+E)/(j) ·c·M ₂·n ₂= (1+E)/(j) N

In the formula: n ₃--the mixing drum rotating speed of tumbling.

n ₂--the shaft working speed.

The gearratio of the tilting mechanism of j--from the shaft to the cylindrical shell.

C--unit transformation coefficient

N=cM ₂N ₂--power of agitator.

Shaft is while stirring the cylindrical shell of tumbling when tumbling discharging, and material is not promptly tumbled the initial stage before flowing out as yet, and total power is:

N _O= N + (1+E)/(j) ·N

If E=0.25 j=6, so

(1+E)/(j) =20.83%

The i.e. power that the initial stage of tumbling will additive decrementation 20.83%.So very easily make main motor overload or the discharging of can't tumbling because overload capacity is not enough.If other establishes motor and establishes a cover transmission device again, certainly will make complex structure, cost increases.

The objective of the invention is on the basis of prior art a kind of power assisting device of design, alleviating the load of the shedding mechanism of tumbling, thereby prevent or reduce the overload problems of above-mentioned main motor when discharging.

According to design, it (is that the casing rotating speed is non-vanishing and be a certain constant that technology of the present invention is to utilize common coaxial-type transmission case can make the characteristics of differential gearing, still can transferring power when input, output shaft common axis are rotated), in main transmission, be provided with a coaxial-type transmission case.It promptly is the ring in the main transmission, is again the power assisting device of shedding mechanism of tumbling.

Provide details of the present invention below in conjunction with accompanying drawing.

Accompanying drawing 1 is for having the forced action type list horizontal axis mixer of power assisting device.

Accompanying drawing 2 is an A type power assisting device.

Accompanying drawing 3 is the Type B power assisting device.

As shown in Figure 1,1. promptly the tumble power assisting device of shedding mechanism of the said transmission case of the invention described above, part as main transmission, be positioned at before the shaft, be linked in the mixing drum cylindrical shell its gear housing rigidity and 3. go up, 3. go up so that make the suffered moment of reaction of transmission case casing 1. pass to cylindrical shell in the work, thus the stress of change mixing drum, reach and reduce the moment of resistance of tumbling, reduce the purpose of the power of tumbling.

Shown in accompanying drawing 2, accompanying drawing 3, above-mentioned transmission case 1. with cylindrical shell 3. under the tilting mechanism effect, when bearing rotated the formation differential gearing, 3. motor still can be gone up yet the moment of reaction that casing must be subjected to is introduced to cylindrical shell to the shaft transferring power with a certain definite rotating speed.1. the transmission case that no matter is adopted is that A type power assisting device is that 5. 4. (being shaft) rotation direction is opposite with output shaft for power shaft, still the Type B power assisting device is that 5. 4. (being shaft) rotation direction is identical with output shaft for power shaft, the suffered moment of reaction of its transmission case casing is total opposite with the rotation direction of shaft, just identical with the tumble rotation direction of discharging of mixing drum, so always play help cylindrical shell roll-over action.

Further set forth effect of the present invention below in conjunction with the theory derivation.

As shown in Figure 1, on existing mixer, be provided with respectively as shown in Figure 2 A type power assisting device and Type B power assisting device shown in Figure 3.

The gearratio of its transmission case of A type is i _a=(n _1a)/(n ₂)

The gearratio of its transmission case of Type B is i _b=(n _1b)/(n ₂)

In the formula: n _1a, n _1bBe respectively the transmission case input shaft rotational speed.

Can prove that disregarding under the situation of transmission efficiency, the suffered moment of reaction of transmission case casing is respectively in mixer work:

A type: M _a=(M ₂)/(i _a) (i _a+ 1)=M _1a(i _a+ 1)＞M ₂

Type B: M _b=(M ₂)/(i _b) (i _b-1)=M _1b(i _b-1)＜M ₂

In the formula: M _1a---the input torque of A type transmission case.

M _1b---the input torque of Type B transmission case.

Their direction all with n ₂Rotation direction is opposite, with n ₃Rotation direction is identical, the effect that helpful cylindrical shell is tumbled.

The A type:

Because of M _a＞M ₂So, M _aBe introduced to and just desire cylindrical shell is tumbled in stirring after the cylindrical shell, for no other reason than that 2. the cylindrical shell brake brakes the existence with the bearing moment of friction, cylindrical shell just can not be tumbled.We claim M _aWith M ₂Difference M _fBe the square of going all out certainly,

M _f=M _a-M ₂= M _1a= (M ₂)/(i _a)

If i _aSelect lessly, (generally with 1≤i _a≤ 3 are advisable) make M _fBigger, i.e. M _f＞Σ M _iIn case loosen the brake device then is at M _fThe effect lower shell just can dump material certainly, but may change too soon, for this reason when tumbling discharging the loosen the brake device 2. in joint tumble shedding mechanism clutch 6. so that to the mixing drum rotation speed n of tumbling ₃Limited, still kept n ₃=n ₂/ j, this moment, transmission case was converted into differential gearing by dead axle transmission, can prove that at this moment the rotating speed of shaft is reduced to n _2an _2a=n ₂-n ₃((1+i _a)/(i _a))=n ₂(1-(1+i _a)/(i _aJ))

The gearratio of its tilting mechanism is necessary for behind the A type power assisting device so be provided with:

j _a= (n _2a)/(n ₃) = (n ₂)/(n ₃) (1- (1+i _a)/(i _aj) )= j - (1+i _a)/(i _a)

Behind the obvious engaging clutch, moment (M _f-Σ M _i) will drive shaft through tilting mechanism, make the input torque of transmission case be reduced to M ' _1a, in then tumbling:

Moment of reaction M ' _a=M ' _1a(i _a+ 1)

From the square M ' that goes all out _f=M ' _a-M ₂=M ' _1a(i _a+ 1)-M ₂

The moment that cylindrical shell is delivered on the shaft is:

$\frac{M_f^{\′}-\mathrm{\Σ}{M}_i}{j_{\mathrm{\α}}}=\frac{M_1^{\′}\mathrm{\α}(i_{\mathrm{\α}}+1)-M_2(1+E)}{j_{\mathrm{\α}}}$

Obviously it and transmission case flow to the moment M ' of shaft _1aThe i sum equals the load of shaft, promptly

$\frac{M_1^{\′}\mathrm{\α}(i_{\mathrm{\α}}+1)-M_2(1+E)}{j_{\mathrm{\α}}}+M_{1\mathrm{\α}}^{\′}{i}_{\mathrm{\α}}=M_2^{\′}$

So

$M_{1\mathrm{\α}}^{\′}=M_2\left(\frac{j_{\mathrm{\α}}+1+E}{j_{\mathrm{\α}}{j}_{\mathrm{\α}}+i_{\mathrm{\α}}+1}\right)=\frac{M_2}{i_{\mathrm{\α}}}(1-\frac{1-i_{\mathrm{\α}}E}{i_{\mathrm{\α}}j})M_{1\mathrm{\α}}(1-\frac{1-i_{\mathrm{\α}}E}{i_{\mathrm{\α}}j})$

Power demand is in the process of tumbling:

$N_{\mathrm{\α}}=c\·M_{1\mathrm{\α}}^{\′}\·n_{1\mathrm{\α}}=N(1-\frac{1-i_{\mathrm{\α}}E}{i_{\mathrm{\α}}j})$

Because of M _1a=M _f＞Σ M _i

So i _aE＜1, N _a＜N

After employing A type power assisting device was described, the power consumption when tumbling discharging not only increased than the power of agitator before the discharging, descends to some extent on the contrary, must not cause overload because of the discharging of tumbling.The load of tilting mechanism also greatly reduces simultaneously, and its load is:

M′ _F－ΣM _i＝M′ _1a（i _a＋1）－M ₂－ΣM _i

= M ₂·j _a· (1 - i _aE)/(i _aj)

Type B:

In mixer work, M _b＜M ₂, the moment of reaction can not be offset the moment of friction of material, excess torque fully;

M _b-M ₂=M _1b=M ₂/ i _bCylindrical shell is rotated along the shaft rotation direction, and its limited block is run on the buting iron and is kept motionless, obviously i _bShould get greatly, with i _bBe advisable about=10, so that make M ₂/ i _b=M _1bIt is littler to try one's best, and the discharging moment of resistance of tumbling is diminished, and the load of shedding mechanism reduces.

6. engaging clutch is told a part of power and is overcome the cylindrical shell moment of resistance of tumbling through the shedding mechanism of tumbling during discharging on the shaft, and cylindrical shell is tumbled, and at this moment transmission case is done differential gearing, still keeps n ₃=n ₂/ j, the rotating speed of shaft is reduced to n _2b, can prove

n _2b= n ₂- n ₃(i _b- 1)/(i _b) = n ₂(1 - (i _b- 1)/(i _bj) )

So, establish the Type B power assisting device after, the gearratio of its tilting mechanism is necessary for:

j _b= (n _2b)/(n ₃) = (n ₂)/(n ₃) (1 - (i _b- 1)/(i _bj) ) = j - (i _b- 1)/(i _b)

Draw from shaft because of the moment of cylindrical shell of tumbling, at this moment the increase that will cause shaft moment, power shaft moment establishes that input torque is M ' _1b, then:

The suffered moment of reaction of cylindrical shell is: M ' _b=M ' _1b(i _b-1)

The moment of resistance of tumbling is: M ₂-M ' _b+ Σ M _i=M ₂(1+E)-M ' _1b(i _b-1)

The total load of tumbling on the shaft is:

M ₂+ (M ₂(1 + E) - M ^′ _1b(i _b- 1))/(j _b) = M ^′ _1b·i _b

So; M ^' _1b=M ₂((j _b+ 1+E)/(i _bJ+i _b-1))=M _1b(1+(1+i _bE)/(i _bJ))

Power required in the process of tumbling is:

N _b= c·M ^′ _1bn _1b= N(1 + (1 + i _bE)/(i _bj) )

Work as i _b=1 o'clock (1+i _bE)/(i _bJ)=(1+E)/(j)

Work as i _b＞1 o'clock (1+i _bE)/(i _bJ)＜(1+E)/(j)

After employing Type B power assisting device is described, as long as i _b＞1 power when tumbling discharging just reduces than former machine

To sum up, on former type basis, adjust main transmission A type and Type B power assisting device are set, and the gearratio of corresponding adjustment tilting mechanism, keep M ₂, n ₂, n ₃Constant, and establish:

J=6, E=0.25, i _a=3, i _b=16, then its effect sees the following form:

	The tilting mechanism load	Power when tumbling discharging
			Existing type	M 2?(1+E)=1.25M 2	N(1+?(1?+?E/j)?)?=?1.0283?N
If A type power assisting device	M 2j a?((1?-?i aE/i aj)) =M 2((1?-?i 8E/i aj))(j?-?(1?+?i a/i a)) =0.0648M 2	N(1?-?(1?-?i aE/i aj?))?=0.986N
			If Type B power assisting device	M 2j b((1+i bE/i bj)) =M 2((1+i bE/i bj))(j?-?(i b?-?1/i b)) =?0.2637?M 2	N(1?+?(1+i bE/i bj))?=?1.0521N

After as seen A type power assisting device was set, mechanism's load descended 94.81%, and power descends 18.39%, the exhausted overloading free of master's motor during discharging.After the Type B power assisting device was set, mechanism's load descended 78.9%, and power descends 12.93%, and the overloading ratio of master's motor drops to 5.21% by 20.83% of former machine during discharging.

Claims (3)

1, a kind of single horizontal axis mixer tilting mechanism power assisting device, it is a transmission case in the main transmission, it is characterized in that said transmission case 1., be positioned at before the shaft as a part of transmission system, and its casing and mixing drum cylindrical shell 3. rigidity link.

2, single according to claim 1 horizontal axis mixer shedding mechanism power assisting device of tumbling is characterized in that 1. said transmission case is coaxial-type, promptly power shaft 5. with 4. coaxial line of output shaft.

3, as the shedding mechanism power assisting device of tumbling of single horizontal axis mixer as described in the claim 1,2, it is characterized in that said transmission case 1., 4. 5. its power shaft can adopt rotation mode in the same way with output shaft; Also can adopt the reverse rotation mode.

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