CN101649596B - Paver screed satisfying transverse vibration uniformity - Google Patents

Abstract

The invention discloses a paver screed satisfying transverse vibration uniformity, comprising a combined type screed which is composed of a plurality of sections of screeds, wherein, vibrators are arranged on a plurality of sections of screeds; each vibrator comprises a partiality axis, a bearing arranged on the partiality axis and a bearing base fixed on the screed, wherein, the partiality axis is provided with a power driving mechanism connected with a power source; the nominal amplitudes of a plurality of sections of screeds are identical and are equal to a constant of A0, namely, Ai=mi*eI/Mi=A0=(sigma mi*ei)/sigma Mi, wherein, the mass of the partiality axis mi=Fi*Li*rho, a partiality distance ei=ai*D<2>i/(D<2>i-d<2>i), the section area of the partiality part of the partiality section of the partiality axis Fi=pi*(D<2>i-d<2>i)/4, wherein, Li is the length of the partiality section of the partiality axis, rho is material density of the partiality axis, Di is cylinder diameter of the partiality section of the partiality axis, di is cylinder diameter of journal of the partiality axis and alpha<i> is the space between the cylinder axis of the partiality section of the partiality axis and the cylinder axis of journal. The invention has the advantages of reasonable design, convenient improvement method, good improvement effect and reliable work performance and can effectively solve the problem of poor transverse vibration uniformity along screed width direction of paver in work.

Description

The paver screed of satisfying transverse vibration uniformity

Technical field

The present invention relates to a kind of paver screed, especially relate to a kind of paver screed of satisfying transverse vibration uniformity.

Background technology

Paver is one of necessary key equipment of the various standard highways of making.Screed is as the core work device of paver, the compound that is used for spiral distributor is paved carries out precompressed, shaping and leveling, so that for road roller subsequently rolls the necessary condition of creating, it is one of key device of guaranteeing spreading quality, is directly connected to the performance of product and the quality of building highway.At present, the used screed of paver all is equipped with vibrator both at home and abroad, and the centrifugal force that produces when it rotates at a high speed by eccentric shaft forces screed to produce the vibration effect, thereby improves the degree of compaction of empty shop layer compound, makes the closely knit and surfacing of paving layer.Because the screed of paver is assembled by the multistage screed of different size section, each size section screed quality that vibrator is installed does not wait, therefore be easy to cause the disunity of exciting quality and mass of vibration between different size section screed, each section amplitude of screed when steady-state vibration that causes assembly unit to be got up is difficult to identical, thereby the oscillation crosswise intensity along the screed width can't be identical when paver is worked.Facts have proved, when the vibration screed paver that uses prior art carries out operation, it is bigger that the screed vibration acceleration of different paving widths position differs, the horizontal heterogeneity that has directly caused the paving layer compactness thus, the planeness that rolls the road surface, back is descended, had a strong impact on the quality of construction of the highway.

Summary of the invention

Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, a kind of paver screed of satisfying transverse vibration uniformity is provided, it is reasonable in design, improve one's methods easy and improvement effect is good, reliable working performance, in the time of effectively solving paver work along the uneven problem of screed width oscillation crosswise.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of paver screed of satisfying transverse vibration uniformity, comprise the combined type screed that is assemblied to form by the multistage screed, on the described multistage screed vibrator is installed all, described vibrator comprises eccentric shaft, is installed in the bearing on the eccentric shaft and is fixed on the screed and the bearing support that supplies bearing to install, the quantity of described multistage screed is n, it is characterized in that: the nominal amplitude of described multistage screed all equates and is equal to normal value A ₀, promptly $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{\mathrm{\&Sigma;}{m}_i\&CenterDot;e_i}{\mathrm{\&Sigma;}{M}_i},$ A wherein _iBe the nominal amplitude of i section screed, m _i=F _iL _iρ and its are the quality of institute's setting-up eccentricity axle on the i section screed, $e_i=\frac{a_i{D}_i^2}{D_i^2-d_i^2}$ And it is the eccentric throw of institute's setting-up eccentricity axle on the i section screed, i=1,2,3...n, $F_i=\frac{\mathrm{\&pi;}\&CenterDot;(D_i^2-d_i^2)}{4}$ And it is the eccentric part sectional area of institute's setting-up eccentricity eccentric shaft section on the i section screed, L _iBe the eccentric segment length of institute's setting-up eccentricity axle on the i section screed, ρ is the density of material of institute's setting-up eccentricity axle on the i section screed, D ₁It is the eccentric segment body diameter of institute's setting-up eccentricity axle on the i section screed; d _iBe the axle journal body diameter of institute's setting-up eccentricity axle on the i section screed, α _iIt is the spacing of the eccentric segment cylinder axis and the axle journal cylinder axis of institute's setting-up eccentricity axle on the i section screed.

Described L _iCorresponding with the transverse width of i section screed.

Be in transmission connection by shaft coupling between the eccentric shaft of being installed on adjacent two sections screeds in the described multistage screed.

Described power source is a motor, and described power drive mechanism is a pulley transmission mechanism.

Described vibrator level is installed in the barycenter of screed.

The present invention compared with prior art has the following advantages:

1, reasonable in design and improve one's methods easy, little to the improvement amplitude of existing each section of paver screed, only need mainly the eccentric segment body diameter of institute's installation vibrator eccentric shaft on each section screed and eccentric segment length to be carried out corresponding improvement and get final product according to design result.

2, improvement effect is good, reliable working performance, can effectively solve paver when work along the uneven problem of screed width oscillation crosswise, it specifically is screed quality according to the different size section, design different vibrator eccentric shaft sizes, have identical nominal amplitude with assurance different size section screed, thereby guarantee that screed all keeps identical vibration in whole paving width direction, so that the paving layer compactness reaches higher horizontal homogeneity.When different size section screed is assembled into a certain paving width whole, amplitude along the screed width will evenly distribute, like this when operating paver, vibrator is through the transmission that is connected of centralized driving and shaft coupling, the vibrator of installing on the different size section screed will force separately, and screed produces identical vibration, thereby make the shop layer compound on the whole paving width direction all be subjected to identical vibration action effect, guaranteed that the paving layer compactness reaches higher horizontal homogeneity.The paver screed that the present invention is designed, little to the structural change of vibrator, both guaranteed vibrating effect and operation quality, can not influence relevant other apparatus structures with screed and function again.Evidence, the paver screed that adopts the present invention to design, under identical execution conditions and screed width, the transverse vibration uniformity of screed can improve about 40%, and paving width is big more, and the effect of this improvement is just remarkable more.

When different size section screed is assembled into a certain paving width whole, though each size section screed quality of vibrator is installed not to be waited, but diameter dimension and eccentric segment length by the choose reasonable eccentric shaft, guaranteed that every section screed all has identical nominal amplitude, has guaranteed along the even distribution of whole screed width amplitude.Like this when operating paver, vibrator is through the transmission that is connected of centralized driving and shaft coupling, the vibrator of installing on the different size section screed will force separately, and screed produces identical vibration, thereby make the shop layer compound on the whole paving width direction all be subjected to identical vibration action effect, guaranteed that the paving layer compactness reaches higher horizontal homogeneity.

In sum, the present invention adopts the method for designing of nominal amplitudes such as screed to determine the vibrator eccentric shaft size of different size section screed, can significantly improve the transverse vibration uniformity of screed, guarantee that paving concrete pavement reaches than high-flatness, and method for designing is simple and reliable, and does not influence other apparatus structure and the functions relevant with screed.During vibrator works, eccentric shaft rotates generation centrifugal force at a high speed, forces the screed that is installed together with it to produce the vibration effect.The vibration that screed produces then is directly passed to shop layer compound by its base plate, thereby improves the degree of compaction of empty shop layer compound, makes the closely knit and surfacing of paving layer.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Description of reference numerals:

The 1-screed; The 2-bearing; The 3-eccentric shaft;

The 4-bearing support; The 5-power source; The 6-power drive mechanism;

The 7-shaft coupling.

The specific embodiment

As shown in Figure 1, the present invention includes the combined type screed that is assemblied to form by multistage screed 1, on the described multistage screed 1 vibrator is installed all, the bearing support 4 that described vibrator comprises eccentric shaft 3, is installed in the bearing 2 on the eccentric shaft 3 and is fixed on the screed 1 and supplies bearing 2 to install, the quantity of described multistage screed 1 is n, and the power drive mechanism 6 that joins with power source 5 is housed on the described eccentric shaft 3.3 of eccentric shafts of being installed on adjacent two sections screeds 1 in the described multistage screed 1 are in transmission connection by shaft coupling 7.In the present embodiment, described combined type screed comprise the section basic width section screed and successively symmetry be installed in a plurality of lengthening width section screeds of the section basic width section screed left and right sides, the section basic width section screed connect to form with right section basic width section screed by two symmetrical left section basic width section screeds and the structure of left section basic width section screed and right section basic width section screed all identical with size.The eccentric shaft 3 of institute's installation vibrator is in transmission connection by power drive mechanism 6 and power source 5 on described left section basic width section screed or the right section basic width section screed, and the eccentric shaft 3 of institute's installation vibrator is connected with the vibrator of transmission by shaft coupling 7 on all the other each section screeds.Described power source 5 is a motor, and described power drive mechanism 6 is a pulley transmission mechanism.Described vibrator level is installed in the barycenter of screed 1, usually because of multiple reason, vibrator is installed in the barycenter vicinity of screed 1 along the direction that paves during actual installation.

The nominal amplitude of described multistage screed 1 all equates and is equal to normal value A ₀, promptly $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{\mathrm{\&Sigma;}{m}_i\&CenterDot;e_i}{\mathrm{\&Sigma;}{M}_i},$ A wherein _iBe the nominal amplitude of i section screed 1, m _i=F _iL _iρ and its are the quality of institute's setting-up eccentricity axle 3 on the i section screed 1, $e_i=\frac{a_i{D}_i^2}{D_i^2-d_i^2}$ And it is the eccentric throw of institute's setting-up eccentricity axle 3 on the i section screed 1, i=1,2,3...n, $F_i=\frac{\mathrm{\&pi;}\&CenterDot;(D_i^2-d_i^2)}{4}$ And it is the eccentric part sectional area of institute's setting-up eccentricity axle 3 eccentric segments on the i section screed 1, L _iBe the eccentric segment length of institute's setting-up eccentricity axle 3 on the i section screed 1, ρ is the density of material of institute's setting-up eccentricity axle 3 on the i section screed 1, D _iIt is the eccentric segment body diameter of institute's setting-up eccentricity axle 3 on the i section screed 1; d _iBe the axle journal body diameter of institute's setting-up eccentricity axle 3 on the i section screed 1, α _iIt is the spacing of the eccentric segment cylinder axis and the axle journal cylinder axis of institute's setting-up eccentricity axle 3 on the i section screed 1.

By formula $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{F_i\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;e_i}{M_i}=\frac{\mathrm{\&pi;}\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;a_i\&CenterDot;D_i^2}{{4M}_i}$ As can be known, should design eccentric shaft 3 sizes of institute's installation vibrator on each screed 1 respectively, guarantee that different size multistage screed 1 has identical nominal amplitude according to the quality of different size section screed 1.In the actual processing and making process, under the certain condition of multistage screed 1 structure of forming paver combined type screed and size, for the nominal amplitude of guaranteeing multistage screed 1 all equates and is equal to normal value A ₀, mainly be that the size of institute's installation vibrator eccentric shaft 3 on the different size section screed 1 is determined that mainly in two kinds of situation: (1) is as the length dimension L of eccentric shaft 3 eccentric segments _iWhen constant, can be by the body diameter D of choose reasonable eccentric shaft 3 eccentric segments _iGuarantee that each section screed 1 has identical nominal amplitude, at this moment $D_i=\sqrt{\frac{4A_0{M}_i}{\mathrm{\&pi;\&rho;}{\mathrm{\&alpha;}}_i{L}_i}},$ Design the body diameter D of described eccentric shaft 3 eccentric segments simultaneously _iThe time also to consider the restricted problem of installation site size; (2) as the body diameter D of eccentric shaft 3 eccentric segments _iWhen constant, then can pass through choose reasonable length dimension L _iGuarantee that each section screed 1 all has identical nominal amplitude, at this moment $L_i=\frac{A_0{M}_i}{F_i\text{\&rho;}{e}_i}=\frac{4A_0{M}_i}{\mathrm{\&pi;\&rho;}{\mathrm{\&alpha;}}_i{D}_i^2},$ In the practice, on whole width, can evenly vibrate, then the eccentric segment length L of institute's installation vibrator eccentric shaft 3 on each section screed 1 for guaranteeing each section screed 1 _iEnough length should be arranged, that is to say described L _iCorresponding with the transverse width of i section screed 1, thereby in the eccentric segment length L that designs eccentric shaft 3 _iThe time also to consider the homogeneity question that the width of each section screed 1 and width are improved quality and distributed.In sum, main by changing the eccentric segment body diameter D of institute's installation vibrator eccentric shaft 3 on each section screed 1 _iSize and the eccentric segment length L of eccentric shaft 3 _iSize guarantee described multistage screed 1 amplitude along laterally consistent.

Below be that the machinery lengthening formula paver of 9m is optimized design by the present invention to paving width, paving width is that the combined type screed of the machinery lengthening formula paver of 9m is that section basic width section screed and 8 lengthening width section screeds of 1250 * 2=2500mm are formed the lengthening width section screed that it is 1500mm that described 8 lengthening width section screeds are respectively symmetrical successively two width that are installed in the section basic width section screed left and right sides by width, two lengthening width section screeds that width is 500mm, two lengthening width section screed and two lengthening width section screeds that width is 250mm that width is 1000mm.

Before improving by the present invention, through measuring the structural parameters of institute's installation vibrator eccentric shaft 3 on each size section screed 1 of machinery lengthening formula paver that paving width is 9m, as shown in table 1:

Structural parameters before institute's setting-up eccentricity axle improves on each size section screed 1 of table 1

In the table 1, R _i=D _i/ 2, r _i=d _i/ 2.

Utilize formula $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{F_i\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;e_i}{M_i}=\frac{\mathrm{\&pi;}\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;a_i\&CenterDot;D_i^2}{{4M}_i},$ Quality m to institute's setting-up eccentricity axle 3 on each section screed 1 _i, eccentric distance e _i, nominal amplitude A _iCarry out statistical computation etc. parameter, the result is as shown in table 2:

The result of calculation of nominal amplitude before institute's setting-up eccentricity axle improves on each size section screed of table 2

As can be seen from Table 2, the nominal amplitude of each section screed 1 has nothing in common with each other, and the nominal amplitude minimum of section basic width section screed is 0.055mm; The nominal amplitude maximum of the lengthening width section screed of width 1500mm is 0.120mm; Both differ more than 2 times, because the nominal amplitude of each section screed 1 is inconsistent, thereby must cause whole combined type screed along horizontal distribution of amplitudes inequality.

Below, consider the horizontal installation dimension L of institute's installation vibrator eccentric shaft 3 on each section screed 1 by the present invention and in conjunction with the actual working state of each section screed 1 _i, to the external diameter R of each section eccentric shaft 3 eccentric segments _iAdjust, the structural parameters that improve institute's installation vibrator eccentric shaft 3 on each size section screed 1 of back are as shown in table 3:

Structural parameters after institute's setting-up eccentricity axle improves on each size section screed 1 of table 3

With reference to the domestic and international nominal amplitude of some vibration press, the amplitude design principles such as follow, make A _i=A ₀=0.08mm utilizes formula $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{F_i\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;e_i}{M_i}=\frac{\mathrm{\&pi;}\&CenterDot;L_i\&CenterDot;\mathrm{\&rho;}\&CenterDot;a_i\&CenterDot;D_i^2}{{4M}_i}$ Inverse goes out the length L of institute's setting-up eccentricity axle 3 eccentric segments on each section screed 1 _i, its result of calculation is as shown in table 4:

Inverse designed eccentric shaft eccentric segment length calculation result after table 4 utilized the unified nominal amplitude of the present invention

According to the result of calculation after table 4 improvement, to being that the eccentric shaft 3 of each section of machinery lengthening formula paver of 9m carries out corresponding improvement to paving width, under each vibrator works alone condition, peak acceleration to each section screed 1 under the different vibration frequencies is measured, and the parameter before choosing the minimum and maximum acceleration virtual value in each section screed 1 under each vibration frequency and improving compares, and its comparative result is as shown in table 5:

Table 5 is paver screed acceleration comparing result before and after the present invention improves

As can be seen from Table 5, for identical vibration frequency, the peak acceleration virtual value is all preceding little than improving with the virtual value difference of minimum acceleration in each section of the paver screed 1 of improvement back, illustrate that its oscillation crosswise acceleration uniformity of paver screed after improving is improved, thereby the uniformity of the screed lateral amplitude of vibration after explanation improves is improved.

The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.

Claims (5)

1. the paver screed of a satisfying transverse vibration uniformity, comprise the combined type screed that is assemblied to form by multistage screed (1), on the described multistage screed (1) vibrator is installed all, described vibrator comprises eccentric shaft (3), be installed in the bearing (2) on the eccentric shaft (3) and be fixed on the bearing support (4) that screed (1) is gone up and supplied bearing (2) to install, the quantity of described multistage screed (1) is n, the power drive mechanism (6) that joins with power source (5) is housed on the described eccentric shaft (3), it is characterized in that: the nominal amplitude of described multistage screed (1) all equates and is equal to normal value A ₀, promptly $A_i=\frac{m_i\&CenterDot;e_i}{M_i}=A_0=\frac{\mathrm{\&Sigma;}{m}_i\&CenterDot;e_i}{\mathrm{\&Sigma;}{M}_i},$ A wherein _iBe the nominal amplitude of i section screed (1), m _i=F _iL _iρ and its are the quality of institute's setting-up eccentricity axle (3) on the i section screed (1), $e_i=\frac{a_i{D}_i^2}{D_i^2-d_i^2}$ And it is the eccentric throw of institute's setting-up eccentricity axle (3) on the i section screed (1), i=1,2,3...n, $F_i=\frac{\mathrm{\&pi;}\&CenterDot;(D_i^2-d_i^2)}{4}$ And it is the eccentric part sectional area of institute's setting-up eccentricity axle (3) eccentric segment on the i section screed (1), L _iBe the eccentric segment length of institute's setting-up eccentricity axle (3) on the i section screed (1), ρ is the density of material of institute's setting-up eccentricity axle (3) on the i section screed (1), D _iIt is the eccentric segment body diameter of institute's setting-up eccentricity axle (3) on the i section screed (1); d _iBe the axle journal body diameter of institute's setting-up eccentricity axle (3) on the i section screed (1), α _iIt is the spacing of the eccentric segment cylinder axis and the axle journal cylinder axis of institute's setting-up eccentricity axle (3) on the i section screed (1).

2. according to the paver screed of the described satisfying transverse vibration uniformity of claim 1, it is characterized in that: described L _iCorresponding with the transverse width of i section screed (1).

3. according to the paver screed of claim 1 or 2 described satisfying transverse vibration uniformities, it is characterized in that: be in transmission connection by shaft coupling (7) between the eccentric shaft of being installed on adjacent two sections screeds (1) in the described multistage screed (1) (3).

4. according to the paver screed of claim 1 or 2 described satisfying transverse vibration uniformities, it is characterized in that: described power source (5) is a motor, and described power drive mechanism (6) is a pulley transmission mechanism.

5. according to the paver screed of claim 1 or 2 described satisfying transverse vibration uniformities, it is characterized in that: described vibrator level is installed in the barycenter of screed (1).

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