Abstract
The invention relates to a vibrating plate for ground compaction, comprising a drive motor, an exciter unit which is driven by the drive motor and by means of which a base plate can be set in vibration, an adjustably mounted hood, which can be adjusted between an operating position at least partially covering the drive motor and a maintenance position at least partially exposing the drive motor, an exhaust air guiding device leading from the drive motor to an exhaust air opening in the hood for the cooling air of the drive motor, the exhaust air guiding device being formed in two parts and comprising an exhaust air adapter on the drive motor side and an exhaust air guide on the hood side, the exhaust air adapter and the exhaust air guide together forming a continuous exhaust air path from the drive motor to the exhaust air opening in the hood when the hood is in the operating position, the exhaust air adapter being attached to the drive motor, and the exhaust air guide being attached to the hood such that it is adjustable with the hood between the operating position and the maintenance position.
Claims
1. A vibrating plate for ground compaction, comprising: a drive motor, an exciter unit driven by the drive motor, by which a base plate is settable in vibration, an adjustably mounted hood which is adjustable between an operating position at least partially covering the drive motor and a maintenance position at least partially exposing the drive motor, an exhaust air guiding device leading from the drive motor to an exhaust air opening in the hood for cooling air of the drive motor, wherein the exhaust air guiding device is configured in at least two parts and comprises an exhaust air adapter on a drive motor side and an exhaust air guide on a hood side, the exhaust air adapter and the exhaust air guide together forming a continuous exhaust air path from the drive motor to the exhaust air opening in the hood when the hood is in the operating position, wherein the exhaust air adapter is attached to the drive motor, wherein the exhaust air guide is attached to the hood such that the exhaust air guide is adjustable with the hood between the operating position and the maintenance position, and wherein both the exhaust air adapter and the exhaust air guide each represent a duct section conducting the exhaust air flow, wherein the two duct sections merge in the operating position.
2. The vibrating plate according to claim 1, wherein: the exhaust air guide forms at least 30% of a total air guiding path through the exhaust air guiding device between the drive motor and the exhaust air opening.
3. The vibrating plate according to claim 1, wherein: a volume of the exhaust air guiding device within the exhaust air guide is larger than a volume of the exhaust air guiding device within the exhaust air adapter.
4. The vibrating plate according to claim 1, wherein: the exhaust air guide on the hood side is configured such that the exhaust air guide changes a flow direction of exhaust air between the drive motor and the exhaust air opening at least once by essentially 90°.
5. The vibrating plate according to claim 1, wherein: the exhaust air adapter has a motor side to connect to the drive motor and a connection side to connect to the exhaust air guide, and the connection side comprises an elastic sealing element which rests against the exhaust air guide when the hood is in the operating position.
6. The vibrating plate according to claim 5, wherein: the connection side of the exhaust air adapter is tilted with respect to a vertical by an angle in a range of 5° to 15°.
7. The vibrating plate according to claim 1, wherein: the exhaust air guide has an inlet wall and a guiding wall, the inlet wall having a connection opening through which exhaust air coming from the exhaust air adapter enters the exhaust air guide, and the inlet wall and the guiding wall being configured as separate components which are mounted successively.
8. The vibrating plate according to claim 7, wherein: the inlet wall of the exhaust air guide is tilted with respect to a vertical (V) by an angle (W) in a range of 5° to 15°.
9. The vibrating plate according to claim 7, wherein: the guiding wall is arranged essentially at a right angle to at least one wall of the hood and is attached to the hood.
10. The vibrating plate according to claim 7, wherein: the inlet wall and the guiding wall are bent from flat blanks.
11. The vibrating plate according to claim 7, wherein: the inlet wall and/or the guiding wall is/are at least partially made of a same material as the hood.
12. The vibrating plate according to claim 1, wherein: the exhaust air guide is formed on at least one side by one or more walls of the hood.
13. The vibrating plate according to claim 1, wherein: the exhaust air guide at least partially has a lining with a sound-damping or a sound-absorbing material.
14. The vibrating plate according to claim 1, wherein: the vibrating plate comprises an exhaust gas guiding device from an exhaust of the drive motor to an exhaust gas opening in the hood, and the hood comprises a damping socket (25) arranged on the hood such that the damping socket is adjustable with the hood between the operating position and the maintenance position, and which is configured to guide exhaust gas from the exhaust to the exhaust gas opening, the damping socket at least partially engaging around the exhaust of the drive motor in the operating position of the hood.
15. The vibrating plate according to claim 14, wherein: the damping socket at least partially has a lining with a sound-damping or a sound-absorbing material.
16. The vibrating plate according to claim 2, wherein: the exhaust air guide forms at least 50% of the total air guiding path through the exhaust air guiding device between the drive motor and the exhaust air opening.
17. The vibrating plate according to claim 3, wherein: the volume of the exhaust air guiding device within the exhaust air guide is at least two times larger than the volume of the exhaust air guiding device within the exhaust air adapter.
18. The vibrating plate according to claim 1, wherein: the exhaust air adapter has a connection side to connect to the exhaust air guide, and the connection side of the exhaust air adapter is tilted with respect to a vertical by an angle in a range of 5° to 15°, and the exhaust air guide has an inlet wall having a connection opening through which exhaust air coming from the exhaust air adapter enters the exhaust guide, and the inlet wall of the exhaust air guide is tilted with respect to the vertical by the angle in the range of 5° to 15°.
19. The vibrating plate according to claim 13, wherein: the sound-damping or the sound-absorbing material comprises at least one of a plastic foam and a non-woven fabric.
20. The vibrating plate according to claim 15, wherein: the sound-damping or the sound-absorbing material comprises at least one of a plastic foam and a non-woven fabric.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The invention will be explained in more detail below by reference to the embodiment examples shown in the figures. In the schematic figures:
(2) FIG. 1: is an oblique perspective front view of a vibrating plate;
(3) FIG. 2: is an oblique perspective rear view of a vibrating plate;
(4) FIG. 3: is an oblique perspective front view of a prior art vibrating plate with the hood removed;
(5) FIG. 4: is an oblique perspective rear view of a prior art vibrating plate with the hood removed;
(6) FIG. 5: is a perspective exploded view of the attachment of the exhaust air adapter to the drive motor of a vibrating plate;
(7) FIG. 6: shows the motor of a vibrating plate according to FIG. 5 with an exhaust air adapter mounted on the drive motor;
(8) FIG. 7: is a side view of the motor according to FIG. 6;
(9) FIG. 8: is an oblique perspective rear bottom view of the hood of a vibrating plate;
(10) FIG. 9: is an oblique perspective rear bottom view of the hood of a vibrating plate with partially mounted exhaust air guide;
(11) FIG. 10: is an oblique perspective rear bottom view of the hood of a vibrating plate with the exhaust air guide mounted;
(12) FIG. 11: is an oblique perspective rear bottom view of the hood of a vibrating plate with exhaust air guide and damping socket;
(13) FIG. 12: shows a cross-section through a vibrating plate along the sectional plane X of FIG. 7; and
(14) FIG. 13: is an enlarged view of cut-out section Y of FIG. 12.
DETAILED DESCRIPTION
(15) Like parts, or parts acting in a like manner, are designated by like reference numerals. Recurring parts are not designated separately in each figure.
(16) FIGS. 1 and 2 each show a generic vibrating plate 1. The vibrating plate includes a guide drawbar 2 with operating elements 3 via which an operator can control the vibrating plate 1. The guide drawbar 2 is arranged at the rear end of the vibrating plate 1 in the forward direction a. In operation, the vibrating plate 1 is guided with a base plate 4 over the soil to be compacted, either in or against the forward direction a. During this process, the base plate 4 is set in vibration by an exciter unit 27, for example an imbalance mass type vibration exciter, mounted in particular directly on the base plate. The exciter unit 27 is driven by a drive motor 9 (see FIGS. 3-7 and 12 and 13), which is typically an internal combustion engine, covered by a hood 5 in FIGS. 1 and 2. The drive motor 9 is mounted on a support plate 30 or a machine frame, which is connected to the base plate 4 via a damping element 31 in a manner known per se in the prior art. The hood 5 closes off the engine compartment from the outside and at least partially forms the outer skin of the vibrating plate 1. The hood 5 is fixedly, but detachably, attached to the support frame of the vibrating plate 1 via fasteners 28/28′, in this case specifically threaded connections. Due to the fixed connection of the hood 5 to the rest of the vibrating plate 1, it can be lifted, for example, via the single-point suspension 6 and therefore easily moved on the construction site. At the same time, the hood 5 can be easily adjusted for maintenance work in the engine compartment. For this purpose, the two fasteners 28 at the rear in the forward direction a are loosened, obviously on both sides of the vibrating plate 1. The fastener 28′ located at the front in the forward direction a can then be used as a swivel joint, so that the hood 5 can be swiveled forward and upward about a horizontal swivel axis S, which runs transversely to the forward direction a, in order to at least partially expose the engine compartment and in particular the drive motor 9 in this manner. The position of the hood 5 shown in FIGS. 1 and 2 corresponds to the operating position. In this position of the hood 5, the vibrating plate 1 can be operated. If, on the other hand, the hood 5 is swiveled as described above, it at least partially exposes the engine compartment and the drive motor 9 while being in the maintenance position. In this position, maintenance works can be performed inside the engine compartment. As can also be seen in FIG. 1, the side of the hood 5 located at the front in the forward direction a comprises an exhaust air opening 7 provided for the exit of the cooling air of the drive motor 9, and an exhaust gas opening 8 provided for the exit of the exhaust gases of the drive motor 9.
(17) FIGS. 3 and 4 show a prior art vibrating plate with the hood removed. As a result, both the drive motor 9 and the fuel tank 10, which are normally covered by the hood, are visible. An exhaust air duct 11 and an exhaust 12 are arranged on the drive motor 9, which are configured to direct the exhaust air and the exhaust gases of the drive motor 9 to the exhaust air opening 7 and the exhaust gas opening 8 in the hood, respectively. The exhaust air duct 11 is funnel- or trumpet-shaped and made of a plastic material, for example. Since the exhaust air duct 11 is directly attached to the drive motor 9, the structure-borne sound vibrations of the drive motor 9 are very well transmitted to the low stiffness plastic material of the exhaust air duct 11. The latter also begins to vibrate and, due to its shape, transmits the structure-borne sound of the drive motor 9 very strongly as noise emission to the outside environment. The prior art exhaust air duct 11 acts as a noise amplifier, so to speak. In addition, the exhaust air duct 11 is completely fixed at only one end, specifically at the drive motor 9. The exhaust air duct 11 must therefore not become too heavy overall, which is why it is not possible to arrange significant quantities of vibration-damping or vibration-absorbing material here. Moreover, the exhaust air duct 11 forms the entire exhaust air guiding device. Only a seal, which may be attached to the engine hood or the exhaust air duct 11, still forms an essential functional component of the entire exhaust air device. The seal prevents heated exhaust air from flowing into the space inside the hood. The present invention starts from this actual state and reduces noise emissions by making the exhaust air guiding device essentially in two parts, as described below.
(18) FIGS. 5 to 7 show the exhaust air adapter 13 according to the invention and its arrangement on the drive motor 9. The exhaust air adapter 13 has a motor side 14 and a connection side 15. With the motor side 14, the exhaust air adapter 13 is attached to the drive motor 9, so that it receives the exhaust air coming from the drive motor 9. FIG. 7 shows that the exhaust air adapter 13 receives the exhaust air coming directly from the heat exchangers 19 of the drive motor 9, for example of the cylinder 18 (see FIG. 12). The exhaust air adapter 13 is connected to the drive motor 9 by means of fastening devices 17, for example threaded connections. Between the motor side 14 and the connection side 15, a cavity extends inside the exhaust air adapter 13, forming an exhaust air path 16. The exhaust air path 16 runs from an inlet for the exhaust air on the motor side 14 to an outlet from the exhaust air adapter 13 on the connection side 15. Overall, therefore, the exhaust air adapter 13 forms a duct for the exhaust air and directs it from the drive motor 9 to the connection side 15. The outlet for the exhaust air on the connection side 15 is furthermore equipped with a sealing element 26, for example a sealing lip. The direction of flow of the exhaust air within the exhaust air adapter 13 is essentially horizontal and perpendicular to the forward direction a. Moreover, the direction of flow of the exhaust air within the exhaust air adapter 13 is essentially perpendicular to the direction of flow of the exhaust gases in the exhaust 12, in particular in the tailpipe of the exhaust 12. The tailpipe of the exhaust 12 is oriented in particular parallel to the forward direction a.
(19) FIGS. 8 to 11 show the modifications to the hood 5 according to the present invention. The view from diagonally below and from the rear as seen in the forward direction a allows a view into the interior space of the hood 5, which serves as the engine compartment when assembled. Since the exhaust air adapter 13 spans only a small part of the total air guiding path from the drive motor 9 to the exhaust air openings 7, it is proposed in accordance with the invention to bridge the remainder of the air guiding path with an exhaust air guide 20 (see FIGS. 10 and 11), which is attached to or integrated in the hood 5. The exhaust air guide 20 comprises a guiding wall 22 and an inlet wall 21. The inlet wall 21 has a connection opening 24 through which the exhaust air coming from the exhaust air adapter 13 is taken into the exhaust air guide 20. The connection opening 24 therefore forms the inlet of the exhaust air guide 20. It is complementary to the outlet of the exhaust air adapter 13 on its connection side 15. Altogether, the inlet wall 21 and the guiding wall 22 form another compartment in the interior space of the hood 5. This compartment is also formed by walls of the hood 5 itself, in the shown embodiment example specifically by the upper side of the hood 5 facing away from the base plate 4 in the mounted state and by the right side wall of the hood 5 oriented parallel to the forward direction a. The overall compartment formed by the exhaust air guide 20 in the interior of the hood 5 is essentially airtight, except for the connection to the engine compartment or the exhaust air adapter 13 via the connection opening 24 and the connection to the outside environment via the exhaust air opening 7. The latter is created by the fact that the exhaust air guide 20, which is open to the front in the forward direction a of the vibrating plate 1, tightly rests against the wall of the hood 5, which is located to the front in the forward direction a and also has the exhaust air opening 7, in such a way that the interior space of the exhaust air guide 20 communicates with the exhaust air opening 7. As shown in the sequence of FIG. 9 and FIG. 10, first the guiding wall 22 is mounted in the hood 5, the function of which is only to separate and seal the compartment of the exhaust air guide 20. Then the inlet wall 21 is mounted, both on the hood 5 and the guiding wall 22. Both the inlet wall 21 and the guiding wall 22 are formed of punched and bent metal sheets with an average thickness of 4 mm. The hood 5 is also made of such sheet metal. Overall, this results in a very stable construction, so that the interior space of the exhaust air guide 20 can be lined with a sound-damping or sound-absorbing material (see FIG. 13).
(20) FIG. 11 moreover illustrates another aspect of the present invention. Specifically, FIG. 11 shows a damping socket 25 arranged around the exhaust gas opening 8. The damping socket 25 is designed, for example, as a pipe connection piece and has a larger diameter than the exhaust 12 of the drive motor 9. The damping socket 25 is formed and the exhaust 12 is arranged in such a way that the exhaust 12 projects into the damping socket 25 in the operating position of the hood 5. In other words, the damping socket 25 partially accommodates the exhaust 12. It is complementary in shape to the exhaust 12, and thus may take different shapes than, for example, a round tubular piece, as in the embodiment example shown. Overall, therefore, the damping socket 25 forms part of the exhaust gas guiding device and guides the exhaust gas coming from the exhaust 12 to the exhaust gas opening 8 of the hood 5. In addition, the damping socket 25 is also lined with a sound-absorbing or sound-damping material.
(21) FIGS. 12 and 13 show the interaction of the exhaust air adapter 13 and the exhaust air guide 20 when the hood 5 is in the operating position. For this purpose, FIG. 12 shows a cross-section through the vibrating plate 1 including the hood 5 at the level of the plane X of FIG. 7. FIG. 13 in turn shows an enlarged view of cut-out section Y of FIG. 12. The cooling air of the drive motor 9 flows around the heat exchangers 19 of the cylinder 18 and then enters the exhaust air adapter 13 as exhaust air. Here it flows through the exhaust air path 16 and enters the exhaust air guide 20 at the connection side 15 of the exhaust air adapter 13 and through the connection opening 24, where it flows through the exhaust air path 23 until it finally leaves the hood 5 at the exhaust air opening 7 and passes into the outside environment. The exhaust air guide 20 is configured such that it deflects the exhaust air flow by approximately 90°, specifically from a flow direction horizontal and perpendicular to the forward direction a to a flow direction still horizontal but parallel to the forward direction a. In the situation shown with the hood 5 in the operating position, the exhaust air adapter 13 and the exhaust air guide 20 closely rest against each other. The sealing element 26 on the exhaust air adapter 13 seals the transition of the exhaust air from the exhaust air adapter 13 into the exhaust air guide 20. The connection side 15 of the exhaust air adapter 13 and the inlet wall 21 of the exhaust air guide 20 complementary to one another. In the present embodiment example, they each lie in a plane that is parallel to plane E as shown in FIG. 13, so that they rest against each other in plane E. The plane E and thus also the connection side 15 and the inlet wall 21 form an angle W with a vertical V, which is 10°, for example. The vertical V is perpendicular to the flat main extension of the base plate 4. In other words, the connection side 15 and the inlet wall 21 are tilted by the same angle W with respect to a vertical V. In addition, the inlet wall 21 and the connection side 15 are parallel to the forward direction a. This facilitates the adjustment of the hood 5 between the maintenance position and the operating position, especially when the hood 5 is adjusted between these positions by a swivel movement as in the shown embodiment example. FIG. 13 also shows an example of a piece of sound-damping or sound-absorbing material 29 with which the entire exhaust air guide 20 is lined.
(22) In contrast, the exhaust air guiding device according to FIGS. 3 and 4, which is formed by a single exhaust air duct 11 in the prior art, is designed in two parts according to the invention, with the larger part being fixedly arranged on the hood 5 or integrated in the hood 5. The main advantages are a better adjustability of the hood 5 between the operating position and the maintenance position, an enlargement of the part of the exhaust air guiding device fixed to the hood 5, i.e. the exhaust air guide 20, so that sound-damping material can be used. Due to the more rigid configuration of the exhaust air guide 20 compared to the exhaust air duct 11 and the structural separation from the drive motor 9, less structure-borne sound from the drive motor 9 is transmitted into a noise emission to the outside environment. In addition, the hood 5 according to the invention may be modified with a damping socket 25 that reduces noise emissions from the exhaust 12.
