CN111663407B - Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly - Google Patents
Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly Download PDFInfo
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- CN111663407B CN111663407B CN202010645188.0A CN202010645188A CN111663407B CN 111663407 B CN111663407 B CN 111663407B CN 202010645188 A CN202010645188 A CN 202010645188A CN 111663407 B CN111663407 B CN 111663407B
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- wheel
- amplitude modulation
- road roller
- hydraulic cylinders
- vibration
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/23—Rollers therefor; Such rollers usable also for compacting soil
- E01C19/28—Vibrated rollers or rollers subjected to impacts, e.g. hammering blows
- E01C19/286—Vibration or impact-imparting means; Arrangement, mounting or adjustment thereof; Construction or mounting of the rolling elements, transmission or drive thereto, e.g. to vibrator mounted inside the roll
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Machines (AREA)
Abstract
The invention discloses a vibration wheel amplitude modulation mechanism of a road roller and a vibration wheel assembly, wherein the vibration wheel amplitude modulation mechanism of the road roller is applied to the road roller with a grinding wheel, and the grinding wheel is internally provided with an installation space, and comprises: the inner wheel body is positioned in the installation space and is integrally of a cylindrical structure; the adjustable supporting body is supported between the outer surface of the inner wheel body and the inner wall surface of the mounting space and is used for adjusting the radial position of the inner wheel body in the mounting space; the vibrating shaft is positioned in the inner wheel body; one end of the guide rod is fixed on the vibration shaft, and the other end of the guide rod points to the inner surface of the inner wheel body; and the balancing weight is provided with a guide hole matched with the guide rod and is sleeved on the guide rod. The structure is relatively compact based on the invention, and the amplitude can be adjusted steplessly.
Description
Technical Field
The invention relates to an amplitude modulation mechanism of a road roller vibration wheel and also relates to a vibration wheel assembly.
Background
In the construction of asphalt concrete pavements, a vibratory roller is used as the last process of pavement construction, and the quality of the vibratory compaction effect directly influences the quality of the pavement. Vibration of a vibratory roller is achieved in most applications by rotation of a vibratory wheel mounted within a grinding drum. Furthermore, different amplitudes of the vibrating wheel are realized by amplitude modulation mechanisms, and common amplitude modulation mechanisms comprise a forward and reverse rotation amplitude modulation mechanism, a double-shaft amplitude modulation mechanism and a sleeve shaft amplitude modulation mechanism. The positive and negative rotation amplitude modulation mechanism can only realize the adjustment of two amplitudes, and strong impact and huge noise exist in the adjustment process, which brings huge damage to the performance of the equipment and the physical and psychological health of operators; the double-shaft amplitude modulation mechanism and the sleeve shaft amplitude modulation mechanism can realize adjustment of various amplitudes, but the adjustment is step adjustment, the amplitude modulation level is half of the number of teeth of the external spline, and the vibratory roller needs to stop working during amplitude modulation and manually modulate the amplitude, so that the working efficiency is influenced, and unnecessary workload is brought to constructors.
Chinese patent document CN106381800A discloses an amplitude modulation and frequency modulation device of a road roller, which is a substantially dual-axis amplitude modulation mechanism, and discloses a steel wheel, i.e. a rolling wheel, wherein the amplitude modulation and frequency modulation device is installed in the steel wheel, amplitude modulation is performed by an independent amplitude modulation motor, and the amplitude modulation device is adapted to a first driving mechanism to drive a corresponding vibration mechanism to generate vibration. The principle of amplitude modulation is that an amplitude modulation motor drives an excitation box to rotate through a gear transmission mechanism, and the rotation of the excitation box can cause the position of an eccentric shaft arranged on the excitation box to change, so that the amplitude is changed. In contrast, the structure needs to overcome the motion interference between the am and fm device and the first driving mechanism, or the motion adaptation between the am and fm device and the first driving mechanism needs to be designed specially, and the whole structure is relatively complex.
Chinese patent document CN210288041U discloses a vibratory roller with a relatively compact structure and a tunable torque for a vibratory wheel, which is essentially a positive and negative amplitude modulation mechanism, and the tuning principle thereof is to open an arc-shaped grooved rail on an end plate of a grinding wheel, and a pin shaft (i.e. a support shaft) of a counterweight roller is installed on the arc-shaped grooved roller, when the grinding wheel is positively transmitted, the pin shaft will slide to one end of the arc-shaped grooved rail, and when the grinding wheel is overturned, the pin shaft will slide to the other end of the arc-shaped grooved rail, thereby achieving tuning. The tuning essence can only realize two amplitudes, and the rolling wheel is required to change forward and reverse rotation, and although the structure is simple, the application range is very narrow.
Disclosure of Invention
The invention aims to provide a road roller vibration wheel amplitude modulation mechanism which has a relatively compact structure and can be adjusted in a stepless manner, and also relates to a vibration wheel assembly provided with the road roller vibration wheel amplitude modulation mechanism.
In an embodiment of the present invention, there is provided a width modulation mechanism for a road roller vibratory wheel, applied to a road roller having a grinding wheel with a mounting space therein, including:
the inner wheel body is positioned in the installation space and is integrally of a cylindrical structure;
the adjustable supporting body is supported between the outer surface of the inner wheel body and the inner wall surface of the mounting space and is used for adjusting the radial position of the inner wheel body in the mounting space;
the vibrating shaft is positioned in the inner wheel body;
one end of the guide rod is fixed on the vibration shaft, and the other end of the guide rod points to the inner surface of the inner wheel body;
and the balancing weight is provided with a guide hole matched with the guide rod and is sleeved on the guide rod.
Optionally, the adjustable support comprises at least two sets of hydraulic cylinders;
each group of hydraulic cylinders comprises 2-4 hydraulic cylinders;
if each group of hydraulic cylinders has 3 hydraulic cylinders, the actuating direction of one hydraulic cylinder is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders;
if each group of hydraulic cylinders has 4 hydraulic cylinders, the actuating direction of the resultant force of two hydraulic cylinders is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders.
The cylinder body of the hydraulic cylinder is fixed on the inner wall of the installation space, and the push rod is supported on the outer surface of the inner wheel body.
Optionally, a spring is arranged between the balancing weight and the vibration shaft;
correspondingly, the spring is sleeved on the guide rod.
Optionally, the guide rod is a radial rod with respect to the axis of vibration.
Optionally, the guide rods have three sets, three sets of guide rods being arranged along the axial direction of the vibration axis.
Optionally, the inner surface of the inner wheel body is provided with a slideway in friction fit with the balancing weight.
Optionally, the slideway is a copper sleeve embedded in the inner surface of the inner wheel body.
Optionally, the hydraulic cylinders on the same side among the hydraulic cylinders in each group are communicated through oil passages to be driven synchronously.
Optionally, the hydraulic cylinder is equipped with a hydraulic lock to lock the extended length of the hydraulic cylinder push rod after the adjustment is completed.
In an embodiment of the invention, the invention further provides a vibration wheel assembly with the vibration wheel amplitude modulation mechanism of the road roller.
In an embodiment of the invention, the main body for providing amplitude adjustment is an inner wheel body, the inner wheel body is a cylinder, and the position of the cylinder in the rolling wheel body is adjusted through an adjustable support body, so that the amplitude of the vibrating machine is changed. Wherein the position is the radial position of the inner wheel body in the grinding wheel. Providing a guide rod, wherein one end of the guide rod is fixed on the vibration shaft, the other end of the guide rod points to the inner surface of the inner wheel body, a balancing weight is sleeved on the guide rod, the balancing weight is attached to the inner surface of the inner wheel body by using centrifugal force or extra additional force, and vibration is generated in the rotation process of the vibration shaft. The whole structure is relatively compact, the adjustment of the amplitude is based on the position change of the inner wheel body, the position change can be the change on a designated radial line, the adjustment is very simple, and the stepless adjustment can be realized.
Drawings
FIG. 1 is a schematic sectional view of a vibration wheel assembly according to an embodiment.
FIG. 2 is a schematic left sectional view of the vibrating wheel assembly (omitting the spring) according to an embodiment.
FIG. 3 is a hydraulic schematic of a hydraulic cylinder control circuit according to one embodiment.
In the figure: 1. the hydraulic system comprises a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, a third hydraulic cylinder.
Detailed Description
In some implementations, the vibratory wheel of the roller is vibrated by means of an eccentric mechanism, and generally the roller itself does not have a mechanism for driving it forward or backward, and the driving wheel of the roller is generally the rear wheel. However, some rollers have both front and rear wheels which are rolling wheels, one of which is a drive wheel. In either form, the rollers are also commonly configured as vibratory wheels.
In fig. 1, the roller body 2 is used to represent a conventional roller without a vibration mechanism, and a portion located inside the roller body 2 is a portion for providing vibration and a portion for adjusting the vibration amplitude thereof. In the embodiments of the present invention, attention is directed to improvements in the amplitude modulation mechanism of road roller vibratory wheels, and it is understood that it is the basis for a new type of road roller vibratory wheel and naturally also the basis for a road roller vibratory mechanism.
Referring to the accompanying drawings 1 and 2 of the specification, there is shown a vibratory roller amplitude modulation mechanism of a roller, the outermost part of which is a roller body 2, which is intended to represent a conventional roller without a vibratory mechanism. The roller is typically a steel roller, hollow inside, and in the embodiment of the invention, the space inside the hollow roller body 2 is referred to as the mounting space, which is used to mount the vibration mechanism of the roller.
In the embodiment of the invention, the amplitude modulation mechanism of the road roller vibration wheel comprises an inner wheel body 3, an adjustable support body, a vibration shaft 6, a guide rod 8 and a balancing weight 9. Wherein, the balancing weight 9 can naturally generate different eccentricities of the vibrating wheel at different positions of the guide rod 8. It should also be understood that the shift of the center of gravity of the vibrating wheel may be changed by changing the position of the inner wheel body 3.
Referring to the inner wheel body 3 shown in the attached drawings 1 and 2 of the specification, it is a component of a cylinder structure as a whole, and is installed in the installation space in the wheel body 2, and the space in the cylinder provides a sub-installation space for installing the counterweight 9 and the guide rod 8.
It is to be understood that the vibrations due to the vibrating wheel are most often applied in the sense that their centre of gravity is not coincident with their axis, but due to their own structure of revolution, in other words, the centre of gravity can be adjusted on a radial line. Thus, although in the embodiment of the invention the position of the inner wheel 3 in the mounting space is adjusted by means of four directional hydraulic cylinders, it will be appreciated that this adjustment is not intended to adjust any change in the position of the centre of gravity in the mounting space, but rather an adjustment on a determined radial line, and is relatively simple to implement.
As a general knowledge in the field of machinery, for example, a vibrating wheel, its eccentricity is biased only in a certain direction, not biased which can vary in the circumferential direction at any time.
Accordingly, an adjustable supporting body is provided, which is supported between the outer surface of the inner wheel body 3 and the inner wall surface of the mounting space, for adjusting the position of the inner wheel body 3 in the radial direction of the mounting space, which may be a definite radial direction, thereby reducing the direction of the adjustable supporting body.
As will be apparent from the foregoing description, it is inevitable that adjustment based on such a single direction will enable adjustment of the position of the center of gravity of the vibratory wheel.
As for the vibrating shaft 6, the position of the vibrating shaft 6 is determined with respect to the position variability of the inner cone body 3, and the vibrating shaft 6 is generally mounted on end plates or closing plates at both ends of the grinding wheel body 2 through bearings, so that the position certainty of the vibrating shaft 6 further reduces the ease of the arrangement of the vibrating wheel.
Since the inner wheel body 3 does not rotate along with the vibration shaft 6, and the rotation of the roller body 2 during operation belongs to a low-speed wheel body, it should be noted that the rotation speed of the roller body 2 during operation is less than or equal to 6km/h, and the rotation speed of the vibration shaft 6 is relatively high, and the power part for providing vibration does not include the inner wheel body 3 in the embodiment of the present invention.
The power part of the vibration comprises a guide rod 8 and a balancing weight 9, wherein one end of the guide rod 8 is fixed on the vibration shaft 6, and the connection between the guide rod and the vibration shaft is preferably welded. The other end of the guide rod 8 is directed towards the inner surface of the inner wheel 3. In the structure shown in fig. 1, the guide rod 8 is a radial rod of the vibration shaft 6, and in a preferred embodiment, the guide rod 8 may form an angle with a radial line of a midpoint of a connection point of the vibration shaft 6, that is, an inclined state, and the angle may be controlled to be 45 to 60 degrees, so that even when the speed of the vibration shaft 6 is relatively low, the counterweight 9 can still be engaged with the slideway 5 without being supported by the spring 7, for example.
It should be noted that the guide rod 8 in an inclined state is a common vortex layout structure, and the inclined direction is a direction inclined along the vibration axis 6, which belongs to the content of the common general knowledge in the mechanical field and is not described herein again.
The counterweight 9 can be supported on the slide 5, for example, on account of additional forces, or can be fitted to the slide 5 on account of centrifugal forces.
Accordingly, it can be seen from fig. 1 that the weight 9 is provided with a guide hole for cooperating with the guide rod 8, and the length of the guide hole determines the adjustment range of the inner wheel 3, obviously ensuring that the weight 9 cannot slip off the guide rod 8. In some embodiments, the weight 9 may have a greater radial length with respect to the oscillation axis 6, so that a longer guide hole may be adapted, providing a greater adjustment range for the inner wheel 3.
However, there is the fact that the adjustment range of the so-called amplitude adjustment, which in principle does not need to be too large, often only needs to be adjusted within a small range, so that the guide hole length to which the counterweight 9 is fitted, as shown in fig. 1, is not very large.
Accordingly, the adjustment range of the four hydraulic cylinders in the figure does not need to be too large.
Meanwhile, the compression ratio of the liquid is almost negligible, and the extension length of the piston of the hydraulic cylinder is in direct proportion to the amount of the hydraulic oil flowing in, and belongs to a precise adjustment component.
In a preferred embodiment, the adjustable support comprises at least two sets of hydraulic cylinders;
each group of hydraulic cylinders comprises 2-4 hydraulic cylinders;
if each group of hydraulic cylinders has 3 hydraulic cylinders, the actuating direction of one hydraulic cylinder is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders;
if each group of hydraulic cylinders has 4 hydraulic cylinders, the actuating direction of the resultant force of two hydraulic cylinders is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders.
The distribution of the cylinders of each group shown in fig. 1 is a special case, but it does not represent the best case, and the cylinders of each group perform a lot of useless work in an array manner with circumferentially uniform positions in the figure.
For the purpose of energy saving and consumption reduction, the usage amount of each group of hydraulic cylinders is preferably small, although more hydraulic cylinders are adopted in some embodiments.
In the preferred embodiment, only two hydraulic cylinders need be provided for each set of cylinders, with the two cylinders being opposed on opposite sides of the inner wheel body 3. In this condition, the inner wheel 3 needs to have additional support to be guided in the direction in which the two cylinders oppose each other.
The additional support is preferably a guide plate, which is parallel to each other and has a distance between them of exactly the outer diameter of the inner wheel 3, between which the inner wheel 3 is guided.
When two hydraulic cylinders are adopted, the control mode of the hydraulic cylinders is relatively simple, and only one hydraulic cylinder needs to be controlled to move forward and backward during control.
Regarding the way of assembling the hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixed on the inner wall of the installation space, i.e. the inner wall of the grinding wheel body 2, and the push rod of the hydraulic cylinder is supported on the outer surface of the inner wheel body 3.
In a preferred embodiment, a spring 7 is disposed between the weight 9 and the vibration shaft 6, so that the weight 9 is reliably pressed against the inner surface of the inner wheel body 3.
Although the friction force between the weight 9 and the inner ring 3 is inevitably increased when the spring 7 is provided, the impact of rigidity is not generated, and there are advantages and disadvantages in comparison with the case where the spring 7 is not provided.
Correspondingly, the spring 7 is sleeved on the guide rod 8, and the guide rod 8 forms a spring guide post of the spring 7, so that the instability of the spring 7 is avoided.
The axial length of the roller is generally greater than or equal to 1.6m, and generally less than or equal to 2.1m, and the inner wheel 3 accommodated in the roller is adapted to be recessed by at least 15cm at each end with respect to the roller body 2, even though the inner wheel 3 is still relatively long, for which reason the guide rods 8 are provided in groups to obtain a better load distribution.
Further, the guide rods 8 have three sets, three sets of guide rods 8 being arranged in an axial array along the vibration axis 6.
Preferably, the inner surface of the inner wheel body 3 is provided with a slideway 5 which is in friction fit with the counterweight 9, so as to reduce the friction coefficient between the inner wheel body 3 and the counterweight 9.
It is obvious that, in view of reducing friction, the coefficient of friction between the slideway 5 and the counterweight 9 is necessarily lower than the coefficient of friction between the body of the inner wheel 3 and the counterweight 9.
Correspondingly, the inner wheel body 3 is generally made of steel wheel, and in a preferred embodiment, the slideway 5 is a copper sleeve embedded in the inner surface of the inner wheel body 3.
In some embodiments, the hydraulic cylinders on the same side among the hydraulic cylinders in each group are communicated through oil passages to be driven synchronously.
Fig. 3 shows a hydraulic schematic diagram of a hydraulic circuit with four hydraulic cylinders in each group, and the hydraulic principle in the diagram is clearer and is not described again.
In a preferred embodiment, the hydraulic cylinder is equipped with a hydraulic lock to lock the length of the cylinder ram that protrudes after the adjustment is completed.
Claims (10)
1. The utility model provides a road roller vibration wheel amplitude modulation mechanism, is applied to the road roller that has the grinding wheel, and has installation space in the grinding wheel, its characterized in that includes:
the inner wheel body is positioned in the installation space and is integrally of a cylindrical structure;
the adjustable supporting body is supported between the outer surface of the inner wheel body and the inner wall surface of the mounting space and is used for adjusting the radial position of the inner wheel body in the mounting space;
the vibrating shaft is positioned in the inner wheel body;
one end of the guide rod is fixed on the vibration shaft, and the other end of the guide rod points to the inner surface of the inner wheel body;
and the balancing weight is provided with a guide hole matched with the guide rod and is sleeved on the guide rod.
2. The road roller vibratory wheel amplitude modulation mechanism of claim 1, wherein the adjustable support comprises at least two sets of hydraulic cylinders;
each group of hydraulic cylinders comprises 2-4 hydraulic cylinders;
if each group of hydraulic cylinders has 3 hydraulic cylinders, the actuating direction of one hydraulic cylinder is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders;
if each group of hydraulic cylinders has 4 hydraulic cylinders, the actuating direction of the resultant force of two hydraulic cylinders is opposite to the actuating direction of the resultant force of the other two hydraulic cylinders;
the cylinder body of the hydraulic cylinder is fixed on the inner wall of the installation space, and the push rod is supported on the outer surface of the inner wheel body.
3. The amplitude modulation mechanism of a road roller vibration wheel according to claim 1, wherein a spring is arranged between the balancing weight and the vibration shaft;
correspondingly, the spring is sleeved on the guide rod.
4. A road roller vibratory wheel amplitude modulation mechanism according to claim 1 or claim 3 wherein the guide rods are radial rods relative to the vibratory shaft.
5. A road roller vibratory wheel amplitude modulation mechanism according to claim 1 wherein the guide rods have three sets, the three sets being axially arrayed along the vibratory shaft.
6. The amplitude modulation mechanism of a road roller vibrating wheel according to claim 1 or 5, wherein the inner surface of the inner wheel body is provided with a slideway in friction fit with the balancing weight.
7. The amplitude modulation mechanism of a road roller vibration wheel according to claim 6, wherein the slideway is a copper sleeve embedded in the inner surface of the inner wheel body.
8. The amplitude modulation mechanism of a road roller vibration wheel according to claim 1, wherein the hydraulic cylinders on the same side among the hydraulic cylinders are communicated through oil passages to be driven synchronously.
9. A road roller vibratory wheel width adjusting mechanism as claimed in claim 1 or claim 8 wherein the hydraulic cylinder is provided with a hydraulic lock to lock the length of the ram of the hydraulic cylinder which is extended after adjustment is complete.
10. A vibratory wheel assembly incorporating a road roller vibratory wheel amplitude modulation mechanism as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010645188.0A CN111663407B (en) | 2020-07-07 | 2020-07-07 | Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010645188.0A CN111663407B (en) | 2020-07-07 | 2020-07-07 | Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly |
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| Publication Number | Publication Date |
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| CN111663407A CN111663407A (en) | 2020-09-15 |
| CN111663407B true CN111663407B (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010645188.0A Active CN111663407B (en) | 2020-07-07 | 2020-07-07 | Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112303A (en) * | 1994-02-09 | 1995-11-22 | 日本电气株式会社 | Vibration motor for obtaining a starting torque with a small current |
| CN204898478U (en) * | 2015-08-18 | 2015-12-23 | 长安大学 | Vibrated roller steel wheel of adjustable amplitude |
| CN108474185A (en) * | 2015-12-28 | 2018-08-31 | 沃尔沃建筑设备公司 | Offset assembly for vibratile compacter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020100338A1 (en) * | 2001-01-29 | 2002-08-01 | Ingersoll-Rand Company | Eccentric assembly with eccentric weight and biased counterweight |
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2020
- 2020-07-07 CN CN202010645188.0A patent/CN111663407B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112303A (en) * | 1994-02-09 | 1995-11-22 | 日本电气株式会社 | Vibration motor for obtaining a starting torque with a small current |
| CN204898478U (en) * | 2015-08-18 | 2015-12-23 | 长安大学 | Vibrated roller steel wheel of adjustable amplitude |
| CN108474185A (en) * | 2015-12-28 | 2018-08-31 | 沃尔沃建筑设备公司 | Offset assembly for vibratile compacter |
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| CN111663407A (en) | 2020-09-15 |
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