CN111663407A - Amplitude modulation mechanism of road roller vibration wheel and vibration wheel assembly - Google Patents

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 a road roller is applied to a road roller with a roller, and the roller has an installation space, comprising: an inner wheel body, which is located in the roller. The installation space has a cylindrical structure as a whole; the adjustable support body is supported between the outer surface of the inner wheel and the inner wall of the installation space to adjust the radial position of the inner wheel body in the installation space; the vibration shaft is located in the inner wheel body; One end of the guide rod is fixed on the vibration shaft, and the other end points to the inner surface of the inner wheel body; the counterweight has a guide hole matched with the guide rod and is sleeved on the guide rod. Based on the present invention, the structure is relatively compact, and the amplitude can be adjusted steplessly.

Description

Roller vibration wheel amplitude modulation mechanism and vibration wheel assembly

technical field

The invention relates to an amplitude modulation mechanism of a vibrating wheel of a road roller, and also relates to a vibrating wheel assembly.

Background technique

In asphalt concrete pavement construction, vibratory roller is the last process of pavement construction, and its vibratory compaction effect directly affects the quality of pavement. Vibration of vibratory rollers is achieved in most applications by the rotation of vibratory wheels mounted within the drum. Furthermore, the different amplitudes of the vibrating wheel are realized by the amplitude modulation mechanism. Common amplitude modulation mechanisms include forward and reverse amplitude modulation mechanisms, biaxial amplitude modulation mechanisms and sleeve-axis amplitude modulation mechanisms. The forward and reverse amplitude modulation mechanism can only achieve two kinds of amplitude adjustment, and there is a strong impact and huge noise in the adjustment process, which will bring great harm to the performance of the equipment itself and the physical and mental health of the operator; the dual-axis amplitude modulation mechanism and the sleeve The shaft amplitude modulation mechanism can realize various amplitude adjustments, but the adjustment is a step adjustment. The amplitude modulation grade is half of the number of external spline teeth, and the vibration roller needs to be stopped when the amplitude modulation is performed. Manual amplitude modulation will not only affect the work efficiency but also give Construction crews brought unnecessary workload.

Chinese patent document CN106381800A discloses an AM and FM device for a road roller, which is essentially a dual-axis AM mechanism. The disclosed steel wheel is a rolling wheel. The AM and FM device is installed in the steel wheel, and is modulated by an independent AM motor and adapted to The first driving mechanism drives the corresponding vibration mechanism to generate vibration. The principle of amplitude modulation is that the amplitude modulation motor drives the vibration excitation box to rotate through the gear transmission mechanism, and the rotation of the vibration excitation box will cause the position of the eccentric shaft installed on the vibration excitation box to change, thereby causing the amplitude to change. Relatively speaking, this kind of structure needs to overcome the motion interference between the AM and FM device and the first driving mechanism, or needs to specially design the motion adaptation between the two, and the overall structure is relatively complicated.

Chinese patent document CN210288041U discloses a relatively compact vibrating wheel torque tunable vibratory roller, which is essentially a positive and negative amplitude modulation mechanism. The pin shaft of the roller (that is, its support shaft) is installed on the arc grooved roller. When the roller is traveling forward, the pin shaft will slide to one end of the arc groove rail, and when the roller is turned over, the pin shaft will slide to the arc groove. the other end of the grooved rail, thereby producing a tunable. In essence, this kind of tuning can only realize two kinds of amplitudes, and needs to change the forward and reverse rotation of the roller. Although its structure is simple, its applicable range is very narrow.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a roller vibration wheel amplitude modulation mechanism with relatively compact structure and stepless adjustment, and the present invention also relates to a vibration wheel assembly equipped with the roller vibration wheel amplitude modulation mechanism.

In an embodiment of the present invention, a vibrating wheel amplitude modulation mechanism of a road roller is provided, which is applied to a road roller with a roller, and the roller has an installation space, including:

The inner wheel body is located in the installation space and has a cylindrical structure as a whole;

The adjustable support body is supported between the outer surface of the inner wheel and the inner wall of the installation space, and is used to adjust the radial position of the inner wheel body in the installation space;

Vibration shaft, located in the inner wheel body;

A guide rod, one end is fixed on the vibration shaft, and the other end points to the inner surface of the inner wheel body;

The counterweight has a guide hole matched with the guide rod and is sleeved on the guide rod.

Optionally, the adjustable support body includes at least two sets of hydraulic cylinders;

Each group of hydraulic cylinders has 2~4 hydraulic cylinders;

If each group of hydraulic cylinders has 3 hydraulic cylinders, the action direction of one of the hydraulic cylinders is opposite to the action direction of the combined force of the other two hydraulic cylinders;

If each group of hydraulic cylinders has 4 hydraulic cylinders, the actuation direction of the resultant force of two hydraulic cylinders is opposite to the actuation 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 provided between the counterweight and the vibration shaft;

Accordingly, the spring fits over the guide rod.

Optionally, the guide rod is a radial rod relative to the vibration axis.

Optionally, the guide rods have three groups, and the three groups of guide rods are arrayed along the axial direction of the vibration axis.

Optionally, the inner surface of the inner wheel is provided with a slideway that frictionally cooperates with the counterweight.

Optionally, the slideway is a copper sleeve embedded in the inner surface of the inner wheel.

Optionally, the hydraulic cylinders on the same side of each group of hydraulic cylinders are communicated through an oil circuit so as to be driven synchronously.

Optionally, the hydraulic cylinder is equipped with a hydraulic lock to lock the protruding length of the push rod of the hydraulic cylinder after adjustment.

In an embodiment of the present invention, there is also provided a vibration wheel assembly having the aforementioned vibration wheel amplitude modulation mechanism of a road roller.

In the embodiment of the present invention, the main body that provides amplitude adjustment is an inner wheel body, and the inner wheel body is a cylinder, and the position of the cylinder in the drum body is adjusted by the adjustable support body, so that the amplitude of the vibrating machine is generated. Change. Among them, the position is the position of the inner wheel body in the radial direction of the drum. Provide a guide rod, one end of the guide rod is fixed on the vibration shaft, and the other end points to the inner surface of the inner wheel body, a weight is set on the guide rod, and the centrifugal force or additional force is used to make the balance weight and the inner wheel body. The inner surface is fitted and vibrates during the rotation of the vibrating shaft. The overall structure is relatively compact, and the adjustment of the amplitude is based on the position change of the inner wheel body. This position change can be a change on a specified radial line. The adjustment is very simple and can realize stepless adjustment.

Description of drawings

FIG. 1 is a schematic diagram of a main cross-sectional structure of a vibrating wheel assembly in an embodiment.

FIG. 2 is a schematic view of the left cross-sectional structure of the vibrating wheel assembly in one embodiment (springs are omitted).

FIG. 3 is a hydraulic schematic diagram of a hydraulic cylinder control circuit in an embodiment.

In the picture: 1. The first hydraulic cylinder, 2. The roller body, 3. The inner wheel body, 4. The second hydraulic cylinder, 5. The slideway, 6. The vibration shaft, 7. The spring, 8. The guide rod, 9. Counterweight, 10. Third hydraulic cylinder, 11. Fourth hydraulic cylinder, 12. Mailbox, 13. Relief valve, 14. Pump, 15. Three-position four-way solenoid valve, 16. Three-position four-way solenoid reversing valve.

Detailed ways

In some implementations, the vibration of the vibrating wheel of the road roller is generally realized by the eccentric wheel mechanism. Generally speaking, the roller itself does not have a mechanism to drive it forward or backward, and the driving wheel of the road roller is generally its rear wheel. However, the front and rear wheels of some road rollers are rollers, and one of the rollers is the drive wheel. Regardless of the type of roller, the drum is generally formulated as a vibrating wheel.

In FIG. 1, the drum body 2 is used to represent a conventional drum without a vibration mechanism, and the part located in the drum body 2 is the part that provides vibration and the part used to adjust its vibration amplitude. In the embodiment of the present invention, emphasis is placed on the improvement of the vibration wheel amplitude modulation mechanism of the road roller. At the same time, it should be known that it is the basis of a new type of roller vibration wheel, and is naturally also the basis of the roller vibration mechanism.

Referring to Figures 1 and 2 of the description, it shows a vibration wheel amplitude modulation mechanism of a road roller, and the outermost part is a roller body 2, which is used to represent a conventional roller without a vibration mechanism. The drum is generally a steel wheel with a hollow interior. In the embodiment of the present invention, the space in the hollow drum body 2 is denoted as the installation space, and the installation space and the vibration mechanism used to install the roller are installed.

In the embodiment of the present invention, the vibration wheel amplitude modulation mechanism of the road roller includes an inner wheel body 3 , an adjustable support body, a vibration shaft 6 , a guide rod 8 and a counterweight 9 . Among them, the different positions of the counterweight 9 on the guide rod 8 will naturally generate different eccentricities of the vibration wheel. At the same time, it should be understood that a change in the position of the inner wheel body 3 will also cause a change in the offset of the center of gravity of the vibrating wheel.

Referring to the inner wheel body 3 shown in FIGS. 1 and 2 of the specification, it is a part of a cylindrical structure as a whole, and is installed in the installation space in the drum body 2, and the space in the cylinder provides A sub-installation space is provided for installing the counterweight 9 and the guide rod 8 .

It should be noted that the vibration of the vibrating wheel is manifested in that its center of gravity does not coincide with its axis in most applications, but because it is a revolving body structure, in other words, the center of gravity can be adjusted on a radial line. Therefore, although in the embodiment of the present invention, the position of the inner wheel body 3 in the installation space is adjusted by means of hydraulic cylinders in four directions, it can be understood that this adjustment is not intended to adjust the center of gravity in the installation space. The change of any position in space, but the adjustment of a certain radial line, is relatively simple to implement.

As a general common sense in the field of machinery, such as the vibrating wheel, its eccentricity is only in a certain direction, rather than the deviation that can be changed in the circumferential direction at any time.

Correspondingly, an adjustable support body is provided, and the adjustable support body is supported between the outer surface of the inner wheel body 3 and the inner wall surface of the installation space, so as to adjust the radial position of the inner wheel body 3 in the installation space. is the determined radial direction, thereby lowering the direction of the adjustable support body.

Based on the foregoing description, it is obvious that the adjustment of the center of gravity of the vibrating wheel can certainly be achieved based on this single-direction adjustment.

For the vibration shaft 6, relative to the positional variability of the inner wheel body 3, the position of the vibration shaft 6 is determined, and is generally installed on the end plates or sealing plates at both ends of the drum body 2 through bearings. Positional certainty, further reducing the ease of vibration wheel setup.

Since the inner wheel body 3 does not rotate with the vibration shaft 6, and the rotation of the roller body 2 during operation belongs to the low-speed wheel body, it should be known that the rotational speed of the roller body 2 during operation is less than or equal to 6km/h, while the rotational speed of the vibration shaft 6 Relatively high, the power part for providing vibration does not include the inner wheel body 3 in the embodiment of the present invention.

The dynamic part of the vibration includes a guide rod 8 and a counterweight 9, wherein one end of the guide rod 8 is fixed on the vibration shaft 6, and the connection between the two is preferably welded. The other end of the guide rod 8 points to the inner surface of the inner wheel body 3 . In the structure shown in FIG. 1 , the guide rod 8 is a radial rod of the vibration shaft 6. In fact, in a preferred embodiment, the guide rod 8 may form a certain angle with the radial line of the midpoint of the connection of the vibration shaft 6, That is, in the inclined state, the angle can be controlled at 45-60 degrees. 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, for example, the spring 7 .

It should be known that the guide rod 8 in the inclined state is a common vortex arrangement structure, and the inclined direction is the direction along the vibration axis 6, which is relatively common knowledge in the mechanical field, and will not be repeated here.

The counterweight 9 can be supported on, for example, the slideway 5 based on an additional force, or can cooperate with the slideway 5 based on centrifugal force.

Correspondingly, it can be seen from FIG. 1 that the counterweight 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 body 3 . Obviously, it is necessary to ensure that the counterweight 9 cannot be driven from the guide rod 8 . slip on. In some embodiments, the counterweight 9 may have a larger radial length relative to the vibration shaft 6 , so that a longer guide hole can be adapted to provide a larger adjustment range for the inner wheel body 3 .

However, there is such a fact that the so-called amplitude adjustment, in principle, the adjustment range does not need to be too large, and often only needs to be adjusted within a small range. Therefore, the balance weight 9 shown in FIG. 1 is suitable for The length of the guide hole is not very large.

It can be seen from this that the adjustment range of the four hydraulic cylinders in the figure does not need to be too large.

At the same time, it should be known that the compression ratio of the liquid is almost negligible, and the elongation of the piston of the hydraulic cylinder is proportional to the amount of hydraulic oil flowing in, which is a precise adjustment component.

In a preferred embodiment, the adjustable support body includes at least two sets of hydraulic cylinders;

Each group of hydraulic cylinders has 2~4 hydraulic cylinders;

If each group of hydraulic cylinders has 3 hydraulic cylinders, the action direction of one of the hydraulic cylinders is opposite to the action direction of the combined force of the other two hydraulic cylinders;

If each group of hydraulic cylinders has 4 hydraulic cylinders, the actuation direction of the resultant force of two hydraulic cylinders is opposite to the actuation direction of the resultant force of the other two hydraulic cylinders.

The distribution method of each group of hydraulic cylinders shown in Figure 1 belongs to a special case, but it does not represent an optimal situation. It is a circumferentially uniform array in the figure, and each group of hydraulic cylinders does more useless work.

For the purpose of saving energy and reducing consumption, it is preferable to use a small amount of hydraulic cylinders in each group, although more hydraulic cylinders are used in some embodiments.

In a preferred embodiment, each group of hydraulic cylinders only needs to be equipped with two hydraulic cylinders, and the two hydraulic cylinders are opposite to opposite sides of the inner wheel body 3 . Under this condition, the inner wheel body 3 needs to have additional support to be guided in the opposite direction of the two hydraulic cylinders.

The additional support is preferably a guide plate, the two guide plates are parallel to each other, the distance between the two guide plates is exactly the outer diameter of the inner wheel body 3, and the inner wheel body 3 is guided between the two guide plates.

When two hydraulic cylinders are used, the control method of the hydraulic cylinder is relatively simple, and only need to control one advance and one retreat.

Regarding the assembly method of the hydraulic cylinder, the cylinder body of the hydraulic cylinder is fixed on the inner wall of the installation space, that is, the inner wall of the drum 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 provided between the counterweight block 9 and the vibration shaft 6 , so that the counterweight block 9 can be reliably pressed against the inner surface of the inner wheel body 3 .

Although the friction force between the counterweight 9 and the inner wheel body 3 will inevitably increase when the spring 7 is provided, the rigid impact will not be generated, which has advantages and disadvantages compared with the solution without the spring 7 .

Correspondingly, the spring 7 is sleeved on the guide rod 8, and the guide rod 8 constitutes a spring guide column of the spring 7, so as to avoid the instability of the spring 7.

The axial length of the roller is generally greater than or equal to 1.6m, and generally less than or equal to 2.1m. If appropriate, the inner roller body 3 accommodated in the roller is indented at least at both ends relative to the roller body 2. 15cm, even so, the inner wheel body 3 is still relatively long, for this reason, the guide rods 8 are arranged in multiple groups to obtain better load distribution.

Further, the guide rods 8 have three groups, and the three groups of guide rods 8 are arrayed along the axial direction of the vibration shaft 6 .

Preferably, the inner surface of the inner wheel body 3 is provided with a slideway 5 that frictionally cooperates with the counterweight block 9 to reduce the coefficient of friction between the inner wheel body 3 and the counterweight block 9 .

Obviously, based on the consideration of reducing friction, the friction coefficient between the slideway 5 and the counterweight 9 must be lower than the friction coefficient between the body of the inner wheel body 3 and the counterweight 9 .

Correspondingly, the inner wheel body 3 generally adopts a steel wheel. 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 of each group of hydraulic cylinders are communicated through an oil circuit to be driven synchronously.

FIG. 3 shows the hydraulic principle diagram of the hydraulic circuit of each group of four hydraulic cylinders. The hydraulic principle in the figure is relatively clear and will not be repeated here.

In a preferred embodiment, the hydraulic cylinder is equipped with a hydraulic lock to lock the protruding length of the push rod of the hydraulic cylinder after the adjustment is completed.

Claims (10)

1. a vibration wheel amplitude modulation mechanism of a road roller, applied to the road roller with a roller, and there is an installation space in the roller, it is characterized in that, comprising: The inner wheel body is located in the installation space and has a cylindrical structure as a whole; The adjustable support body is supported between the outer surface of the inner wheel and the inner wall of the installation space, and is used to adjust the radial position of the inner wheel body in the installation space; Vibration shaft, located in the inner wheel body; A guide rod, one end is fixed on the vibration shaft, and the other end points to the inner surface of the inner wheel body; The counterweight has a guide hole matched with the guide rod and is sleeved on the guide rod. 2. The vibration wheel amplitude modulation mechanism of a road roller according to claim 1, wherein the adjustable support body comprises at least two groups of hydraulic cylinders; Each group of hydraulic cylinders has 2~4 hydraulic cylinders; If each group of hydraulic cylinders has 3 hydraulic cylinders, the action direction of one of the hydraulic cylinders is opposite to the action direction of the combined force of the other two hydraulic cylinders; If each group of hydraulic cylinders has 4 hydraulic cylinders, the actuation direction of the resultant force of two hydraulic cylinders is opposite to the actuation 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 vibration wheel amplitude modulation mechanism of a road roller according to claim 1, wherein a spring is provided between the counterweight and the vibration shaft; Accordingly, the spring fits over the guide rod. 4. The vibration wheel amplitude modulation mechanism of a road roller according to claim 1 or 3, wherein the guide rod is a radial rod relative to the vibration axis. 5 . The vibration wheel amplitude modulation mechanism of a road roller according to claim 1 , wherein the guide rods have three groups, and the three groups of guide rods are arrayed along the axial direction of the vibration shaft. 6 . 6 . The vibration wheel amplitude modulation mechanism of a road roller according to claim 1 or 5 , wherein the inner surface of the inner wheel is provided with a slideway that frictionally cooperates with the counterweight. 7 . 7 . The vibration wheel amplitude modulation mechanism of a road roller according to claim 6 , wherein the slideway is a copper sleeve embedded in the inner surface of the inner wheel. 8 . 8 . The vibration wheel amplitude modulation mechanism of a road roller according to claim 1 , wherein the hydraulic cylinders on the same side of each group of hydraulic cylinders are communicated through an oil circuit to be driven synchronously. 9 . 9 . The vibration wheel amplitude modulation mechanism of a road roller according to claim 1 or 8 , wherein the hydraulic cylinder is equipped with a hydraulic lock to lock the protruding length of the push rod of the hydraulic cylinder after the adjustment is completed. 10 . 10. A vibration wheel assembly equipped with the vibration wheel amplitude modulation mechanism of any one of claims 1 to 9.

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