JP2012036629A - Handrail and machine equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of an attachment part by reducing a vibration amplitude during resonance.SOLUTION: A handrail body 41 of a handrail 40 is a rod-like member formed by bending a metal pipe and one end part 41a and another end part 41b are attached to a revolving super structure of a hydraulic shovel. The handrail body 41 comprises: a rising part 42 extending upward from the end part 41a in a vertical direction; a grip part 43 parallel to a YZ-plane and extending in a direction inclined upward from the front to the rear of the grip part; an inlet part 44 extending along an X-direction; and a descending part 45 extending downward in a vertical direction to the other end 41b. An internal space of the inlet part 44 of the handrail body 41 is partitioned by partition walls 49 from their both side spaces and a granular material 51 is sealed in a space 50 defined by the inner wall surface of the inlet part 44 and the wall surfaces of the partition walls 49.

Description

  The present invention relates to a handrail attached to a vibrating machine such as a construction machine and a machine including the handrail.

  A hydraulic excavator, which is an example of a construction machine, includes a lower traveling body and an upper revolving body that is pivotably attached to the lower traveling body. A frame of the upper swing body is provided with a driver's cab, a mounting portion for a work machine, a machine room for housing equipment such as an engine and a hydraulic pump, and a tank for fuel and hydraulic oil. In such a hydraulic excavator, when performing various maintenance operations such as inspection of each device in the machine room, maintenance, replenishment of fuel and hydraulic oil, etc., the hydraulic excavator may be carried out at a height of the machine body. In such a case, a step is provided on the frame so that the worker can ascend and descend. In addition, handrails are mounted on the sides of the passage to help the operator move up and down using this step.

  The above-mentioned handrail vibrates by applying an excitation force having a wide frequency band from a low frequency band to a high frequency band due to vibration generated when the vehicle travels. Thereby, a big stress acts on the attachment part of a handrail, and there exists a problem that breakage, such as a crack, arises. In particular, at the time of resonance, the vibration amplitude of the handrail increases, and a very large stress acts on the attachment portion. As the size of the machine increases, the size of the handrail increases, the mass increases, and the vibration amplitude of the handrail increases, so this problem becomes more prominent.

  Therefore, Patent Document 1 discloses a configuration in which a handrail is attached via a mounting seat. The mounting seat is disposed between a seat screw into which a bolt for fixing the handrail is screwed and an attachment location on the upper swing body, and has a larger area than the seat screw. Thereby, the rigidity of the attachment part of a handrail can be improved and damage can be suppressed. Moreover, the handrail of patent document 2 is comprised so that the diameter of the vicinity of an attachment end may become large gradually as it approaches an attachment end. Thereby, the rigidity of an attachment part can be improved and damage can be suppressed.

Japanese Patent No. 3610706 Japanese Patent Application Laid-Open No. 2003-119825

  However, in the above-mentioned Patent Documents 1 and 2, the attachment portion is prevented from being damaged by stiffening. In such a case, only the resonance frequency of the handrail becomes high, and the influence of resonance cannot be avoided.

  The objective of this invention is providing the handrail which can prevent the failure | damage of an attaching part by reducing the vibration amplitude at the time of resonance based on such a subject, and a machine provided with the same.

  The handrail according to the first aspect of the present invention is a handrail attached to a vibrating machine, comprising a handrail main body attached to a machine body of the machine, and an end portion of which is a rod-like member, and the granular material. The body is enclosed in a space defined by a wall surface that vibrates with the vibration of the handrail body.

  According to this configuration, when the handrail body vibrates due to transmission of mechanical vibration, the granular material vibrates, the friction between the granular materials, and the wall surface and the granular material defining the space in which the granular material is enclosed, The vibration amplitude of the handrail body at the resonance frequency can be reduced by the vibration damping effect exhibited by the vibration energy consumed and absorbed by the friction. Thereby, since the stress which acts on the attachment part of a handrail main body and an airframe reduces, damage to an attachment part can be prevented.

  In addition, since the vibration damping effect due to the vibration of the granular material can be obtained if the granular material moves, it is sufficient for low-frequency vibration that is difficult to obtain with a general viscoelastic vibration damping material. The vibration control effect can be demonstrated. In addition, in the case of a dynamic vibration absorber such as a damper, the effect is exerted only for a tuned single frequency vibration, but in the case of a granular material, a vibration damping effect is obtained in a wide frequency band. It can be demonstrated. Therefore, even when there are a plurality of resonance frequencies, the vibration amplitude at each resonance frequency can be reduced.

  Further, in the handrail according to the second invention, in the handrail according to the first invention, the handrail body is a hollow member, and the granular material is enclosed in a space defined by an inner wall of the handrail body. Good. According to this configuration, since the inner wall of the handrail main body also serves as the wall surface that defines the enclosed space of the granular material, the configuration can be simplified.

  The handrail according to the third aspect of the present invention further includes a partition wall that partitions the space defined by the hollow inner wall of the handrail main body into a plurality of spaces in the handrail according to the second aspect of the present invention, However, it may be enclosed in at least one of a plurality of spaces partitioned by the partition wall. According to this configuration, it is possible to prevent the granular material from being biased to an unintended location inside the hollow handrail body. In addition, since an appropriate amount of granular material can be enclosed in a relatively narrow place, an appropriate space can be secured in the enclosed space of the granular material, and the granular material can be easily moved. Therefore, the vibration damping effect by the granular material can be effectively exhibited.

  Furthermore, in the handrail according to the fourth invention, in the handrail according to the third invention, the wall surface defining the space in which the granular material is enclosed includes an inner wall of a portion where the amplitude becomes the largest when the handrail body vibrates. You may go out. According to this structure, since a granular body can be moved largely, the bigger damping effect can be exhibited.

  In addition, the handrail according to the fifth invention is the handrail according to the first invention, further comprising a fixing member fixed to the handrail main body and having a wall surface defining a space in which the granular material is enclosed. May be. According to this structure, the damping effect by the granular material can be transmitted to the handrail main body via the fixed portion.

  A handrail according to a sixth invention is the handrail according to the fifth invention, wherein the handrail main body has a bent portion, and the fixing member has both ends sandwiching the bent portion in the handrail main body. It may be a cylindrical member fixed to each of the two parts. According to this configuration, it is possible to obtain a vibration damping effect due to the granular material in the fixed member and to increase the rigidity of the handrail body.

  Furthermore, in the handrail according to the seventh invention, in the handrail according to the first to sixth inventions, the space in which the granular material is enclosed may extend along the main vibration direction of the handrail main body. When the granular material moves, the moving distance of the granular material becomes long if there is no object that obstructs the movement in the moving direction. According to this configuration, the granular material can move a relatively long distance when moving in the main vibration direction of the handrail body. Therefore, a great vibration suppression effect can be exhibited.

  Further, the handrail according to the eighth invention is the handrail according to the first to seventh inventions, wherein the handrail body vibrates in a plurality of directions different from each other, and the space in which the granular material is enclosed is a plurality of handrail bodies. A first space and a second space may be provided that extend in the first and second directions, which are at least two of the vibration directions, and are connected at one end thereof. According to this configuration, a great vibration suppression effect can be exhibited with respect to vibrations in both the first and second directions.

  In addition, the handrail according to the ninth invention is the handrail according to the first to sixth inventions, wherein the handrail main body vibrates in a plurality of directions different from each other, and the space in which the granular material is enclosed is the handrail main body. You may extend in the direction which makes an acute angle with respect to the 1st and 2nd direction which is at least 2 directions among several vibration directions. According to this configuration, the granular material moves in a direction that forms an acute angle with the extending direction of the enclosed space, regardless of whether the granular material vibrates in the first direction or the second direction. Therefore, a relatively large damping effect can be exhibited with respect to vibrations in both the first and second directions.

  Furthermore, the handrail according to the tenth aspect of the present invention further includes a stirring member that is fixed to the handrail main body and disposed in a space in which the granular material is enclosed, and that extends along the longitudinal direction of the space. ing. According to this configuration, as the handrail main body vibrates, the stirring member vibrates, and the granular material and the stirring member come into contact with each other. The vibration damping effect can be enhanced by the friction at this time.

  In the handrail according to the eleventh aspect, a protrusion is formed on the surface of the stirring member. According to this configuration, the friction between the granular material and the stirring member can be increased, and the vibration damping effect can be further enhanced.

  A handrail according to a twelfth aspect of the present invention is the handrail main body, wherein the handrail main body extends in the vertical direction and the plurality of beam portions extending in the horizontal direction and spanned between adjacent strut portions. A space in which the granular material is enclosed is defined by wall surfaces extending in the vertical direction and both ends of which are respectively connected to the beam portion, and the stirring member is a vibration mode of the beam portion. It is provided in a position that hits the belly of According to this configuration, since the stirring member is provided at a position where the amplitude of the beam portion is maximized, the relative displacement between the stirring member and the granular material can be increased. Thereby, since the friction with a granular material and a stirring member becomes large, the bigger damping effect can be acquired.

  In addition, in the handrail according to the thirteenth aspect of the present invention, the handrail main body has a plurality of struts extending in the vertical direction and a plurality of beams extending between the adjacent struts extending in the horizontal direction. A space in which the granular material is enclosed is defined by wall surfaces extending in the vertical direction and both ends of which are connected to the beam portions, thereby defining a space in which the granular material is enclosed. The natural frequencies of the two beam portions to which both ends of the wall surface to be connected are different. According to this configuration, the relative displacement between the stirring member and the granular material can be increased. Thereby, since the friction with a granular material and a stirring member becomes large, the bigger damping effect can be acquired.

  Furthermore, a machine according to a fourteenth aspect of the invention includes the handrail according to any one of the first to thirteenth aspects of the invention. According to this configuration, the vibration amplitude of the handrail at the time of resonance can be reduced, and damage to the handrail attachment portion can be prevented.

  In the present invention, when the handrail main body vibrates due to transmission of machine vibration, the granular material vibrates, the friction between the granular materials, and the wall surface and the granular material defining the space in which the granular material is enclosed. The vibration amplitude of the handrail main body at the resonance frequency can be reduced by the vibration damping effect exhibited by the consumption and absorption of vibration energy by friction. Thereby, since the stress which acts on the attachment part of a handrail main body and an airframe reduces, damage to an attachment part can be prevented.

1 is a schematic side view showing a hydraulic excavator according to a first embodiment of the present invention. 2A and 2B are views showing the handrail of FIG. 1, FIG. 2A is a cross-sectional view along the extending direction of the handrail body, FIG. 2B is a view seen from the front, and FIG. is there. FIG. 3 is a frequency response diagram showing the stress applied to the attachment portion during vibration of the present invention and the conventional handrail, in which FIG. 3A is a first measurement point, FIG. 3B is a second measurement point, and FIG. (C) corresponds to the test result at the third measurement point, respectively. It is a figure which shows the handrail concerning the 2nd Embodiment of this invention, Fig.4 (a) is a perspective view, The figure which shows the cross section along the extending direction of a stiffening member, FIG.4 (b) is FIG. The figure which looked at the stiffening member of a) from the front, FIG.4 (c) is the figure which looked at the stiffening member of FIG.4 (a) from upper direction. It is a figure which shows the handrail concerning 3rd Embodiment, Fig.5 (a) is a perspective view, The figure which shows the cross section along the extending direction of a stiffening member, FIG.5 (b) is the figure seen from the front, figure 5 (c) is a view from above. It is a typical side view showing a hydraulic excavator according to a fourth embodiment. It is sectional drawing which follows the extension direction of the handrail main body of the handrail of FIG. It is sectional drawing which follows the extension direction of the handrail main body of the handrail concerning the 1st modification of 1st Embodiment. It is sectional drawing in alignment with the extending direction of the handrail main body of the handrail concerning the 2nd modification of 1st Embodiment. It is sectional drawing which follows the extension direction of the handrail main body of the handrail concerning the 3rd modification of 1st Embodiment. It is sectional drawing in alignment with the extension direction of the handrail main body of the handrail concerning the 4th modification of 1st Embodiment. It is sectional drawing which follows the extending direction of the handrail main body of the handrail concerning the 1st modification of 4th Embodiment. The cross-sectional view along the extending direction of the handrail body of the handrail according to the second modification of the fourth embodiment is partially enlarged. It is sectional drawing which follows the extending direction of the handrail main body of the handrail concerning the 3rd modification of 4th Embodiment. It is sectional drawing which follows the extension direction of the handrail main body of the handrail concerning the 4th modification of 4th Embodiment.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described with reference to the drawings. Here, a hydraulic excavator will be described as an example of a construction machine.

<First Embodiment>
First, the configuration of the excavator 1 according to the first embodiment will be described with reference to FIG. The excavator 1 mainly includes a lower traveling body 10 that can freely travel, and an upper swing body 20 that is mounted on the upper portion of the lower traveling body 10. The excavator 1 can travel in the left-right direction in FIG. In the following description, the right side in FIG. 1 is referred to as “front”, and the left side is referred to as “rear”. Further, the width direction (direction perpendicular to the paper surface in FIG. 1) of the hydraulic excavator 1 is “X direction”, the traveling direction (left and right direction in FIG. 1) is “Y direction”, and the vertical direction (up and down direction in FIG. 1) is “ Z direction ".

  The upper swing body 20 includes a frame 21 that is attached to the lower traveling body 10 through a swing mechanism 60 so as to be pivotable about a substantially vertical swing axis. In front of the frame 21, an operator cab 22, a mounting portion 23 for the work implement 70, and a tool box 24 are installed in this order from the back side of the sheet of FIG. 1. A fuel tank 25 and an operating oil tank 26 are installed behind the tool box 24. The fuel tank 25 and the hydraulic oil tank 26 are taller than the tool box 24, and there is a step between the tool box 24 and the fuel tank 25. Then, behind the cab 22, the mounting portion 23, and the hydraulic oil tank 26 are a machine room 27 in which devices such as an engine and a hydraulic pump (not shown) are accommodated. Further, a counterweight 28 that is a weight that allows the movement of the center of gravity of the upper swing body 20 to be within an allowable range is installed behind the machine room 27.

  At the front end of the frame 21, a step 29 is provided that serves as a scaffold when an operator ascends and descends from the front of the tool box 24 onto the upper swing body 20. Further, a handrail 40 for raising and lowering is provided on the side of the passage where the worker ascends and descends from step 29.

  As shown in FIG. 2, the handrail 40 is a rod-like member, and has a handrail body 41 whose one end 41 a is attached to the front end of the frame 21 and the other end 41 b is attached to the upper surface of the fuel tank 25 by bolts or the like. It is mainly composed. The handrail body 41 is formed by bending a metal pipe. More specifically, the handrail main body 41 is connected to the upright portion 42 through the upright portion 42 extending from the one end portion 41a in the vertical direction and the first bent portion 42a. Up to the upper position of the tank 25, it is connected to the grip part 43 via the grip part 43 and the second bent part 43a extending in a direction inclined upward from the front to the rear in parallel with the YZ plane, and in the X direction. And a descending portion 45 that extends downward in the vertical direction to the other end portion 41b. .

  In the present embodiment, the handrail body 41 vibrates in a plurality of directions due to vibration during traveling of the hydraulic excavator 1, etc., and the main vibration direction that is the vibration direction with the largest amplitude among the plurality of vibration directions is: It is assumed that the direction is the X direction (the width direction of the excavator 1). That is, the depth portion 44 of the handrail body 41 extends along the main vibration direction.

  As shown in FIG. 2 (a), the internal space of the insertion portion 44 in the handrail main body 41 is partitioned from the spaces on both sides thereof by the partition wall 49, that is, the internal spaces of the grip portion 43 and the lowering portion 45. A large number of granular materials 51 are enclosed in a space 50 defined by the inner wall surface of the recessed portion 44 and the wall surface of the partition wall 49. As the granular material 51, sand, hard sphere, lead, or the like can be used, but reduced iron pellets, blast furnace slag, etc., which are inexpensive from the viewpoint of manufacturing cost, may be used. In this embodiment, reduced iron pellets having a particle size of 8 mm to 15 mm are used. The total weight of the granules 51 is 0.6 kg, which is a filling amount of about 80% of the volume of the space 50. The granular material 51 vibrates when the vibration of the handrail main body 41 is transmitted from the inner wall surface of the inner insertion portion 44 and the wall surface of the partition wall 49.

  Here, the handrail 40 according to the first embodiment described above is configured in a manner similar to that of the handrail 40, but is attached to a conventional handrail that does not enclose the granular material 51 in the space inside the handrail body 41. A comparative test of the stress acting on each was performed. That is, vibration in the X direction is applied to each handrail, and stress is applied at a total of three measurement points, that is, a first measurement point of one end 41a that is a handrail attachment portion and second and third measurement points of the other end 41b. Was measured.

  As shown in FIGS. 3A to 3C, at any measurement point, the stress increases near 23 Hz, and it can be seen that resonance occurs. However, when the handrail 40 of the present invention is used, the magnitude of the stress at the resonance point is almost halved compared to the case of using the conventional handrail. Further, as is apparent from the diagrams of the conventional handrails in FIGS. 3B and 3C, it can be seen that resonance occurs in the vicinity of 45 Hz at the second and third measurement points. However, when the handrail 40 of the present invention is used, the magnitude of the stress at the resonance point is almost halved compared to the case of using the conventional handrail.

  As described above, the handrail 40 attached to the excavator 1 of the first embodiment is a rod-like member formed by bending a metal pipe, and its one end 41a and the other end 41b are turned upward. A handrail body 41 attached to the body 20 and a granular body 51 enclosed in the handrail body 41 are provided. Therefore, when the handrail main body 41 vibrates due to transmission of vibrations generated when the hydraulic excavator 1 travels, the granular body 51 vibrates, the friction between the granular bodies 51, and the space in which the granular body 51 is enclosed. The vibration amplitude of the handrail main body 41 at the resonance frequency can be reduced by the vibration damping effect that is exhibited by the vibration energy consumed and absorbed by the friction between the wall surface defining 50 and the granular material 51. Thereby, since the stress added to the one end part 41a and the other end part 41b which are attachment parts of the handrail main body 41 reduces, damage to the one end part 41a and the other end part 41b can be prevented. Even when there are a plurality of resonance frequencies, the vibration amplitude of the handrail body 41 at each resonance frequency can be reduced.

  In addition, the internal space of the insertion portion 44 in the handrail main body 41 is partitioned from the spaces on both sides thereof by the partition wall 49. The granular material 51 is enclosed in a space 50 defined by the inner peripheral wall of the recessed portion 44 and the wall surface of the partition wall 49. In this way, by arranging the granular material 51 in the space partitioned by the partition wall 49 in the handrail main body 41, the granular material 51 can be disposed at a desired location in the handrail main body 41. In addition, since an appropriate amount of the granular material 51 can be enclosed in the relatively narrow space 50, an appropriate gap can be secured in the space 50, and the granular material 51 can be easily moved. Therefore, the damping effect by the granular material 51 can be exhibited effectively.

  Furthermore, the recessed portion 44 in which the granular material 51 is enclosed extends along the X direction which is the main vibration direction. Therefore, the granular material 51 moving in the main vibration direction can move a relatively long distance. Therefore, a great vibration suppression effect can be exhibited.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the configuration of the handrail 40 of the first embodiment is changed. Specifically, in the handrail 40 of the first embodiment, the granular material 51 is enclosed in the space 50 in the insertion portion 44 of the handrail main body 41, but in the handrail 140 of the present embodiment, the handrail main body 141. The granular material 51 is enclosed in the space 150 in the two stiffening members 146 and 147 that stiffen the surface. The handrail main body 141 of the present embodiment vibrates in at least two directions indicated by an arrow A (X direction) and an arrow B (a direction inclined parallel to the YZ plane and downward from the rear to the front) shown in FIG. Assume that.

  The two stiffening members 146 and 147 are arranged in parallel vertically. Since the configurations of the stiffening members 146 and 147 are substantially the same, only the configuration of the stiffening member 146 positioned above will be described here. The stiffening member 146 is a cylindrical member. One end 146 a is fixed to the grip portion 143 of the handrail main body 141, and the other end 146 b is fixed to the lowering portion 145 of the handrail main body 141. The space 150 defined by the inner wall surface of the stiffening member 146 includes a first space 150a extending from the one end 146a along the arrow B direction, and an end opposite to the one end 146a side of the first space 150a. And a second space 150b extending to the other end 146b along the arrow A direction.

  As described above, in this embodiment, the inner wall surfaces of the stiffening members 146 and 147 that define the space 150 are fixed to the handrail main body 141, and thus vibrate as the handrail main body 141 vibrates. Therefore, similarly to the first embodiment, when the handrail body 141 vibrates, the granular material 51 vibrates. And since the vibration suppression effect by the granular material 51 is transmitted to the handrail main body 141 via the stiffening members 146 and 147, the vibration amplitude of the handrail main body 141 can be reduced. At the same time, the rigidity of the handrail body 141 can be increased by the stiffening members 146 and 147.

  The space 150 in which the granular material 51 is enclosed is constituted by a first space 150a and a second space 150b that extend in the two vibration directions of the handrail body 141 and are connected at one end thereof. Yes. Therefore, a great damping effect can be exhibited with respect to vibrations in either of the two vibration directions.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the configuration of the handrail 40 of the first embodiment is changed. Specifically, in the handrail 40 of the first embodiment, the granular material 51 is enclosed in the space 50 in the insertion portion 44 of the handrail main body 41. However, in the handrail 240 of the present embodiment, the handrail main body 241. The granular material 51 is enclosed in the space 250 in the stiffening member 246 that stiffens the surface. The handrail main body 241 of the present embodiment vibrates in at least two directions indicated by an arrow A (X direction) and an arrow B (a direction inclined parallel to the YZ plane and downward from the rear to the front) shown in FIG. It shall be.

  The stiffening member 246 is a cylindrical member. One end 246 a is fixed to the grip portion 243 of the handrail main body 241, and the other end 246 b is fixed to the descending portion 245 of the handrail main body 241. More specifically, as shown in FIG. 5B, the one end 246a and the other end 246b are located at the same height, and as shown in FIG. 5C, the one end 246a is at the other end 246b. Is located in front of. That is, the space 250 defined by the inner wall surface of the stiffening member 246 extends in a direction that forms an acute angle with respect to both of the two directions indicated by the arrows A and B.

  As described above, in the present embodiment, the inner wall surface of the stiffening member 246 that defines the space 250 is fixed to the handrail main body 241, and thus vibrates as the handrail main body 241 vibrates. Therefore, as in the first embodiment, when the handrail body 241 vibrates, the granular material 51 vibrates. And since the damping effect by the granular material 51 is transmitted to the handrail main body 241 through the stiffening member 246, the vibration amplitude of the handrail main body 241 can be reduced. At the same time, the rigidity of the handrail body 241 can be increased by the stiffening member 246.

  Further, the space 250 in which the granular material 51 is enclosed extends in a direction that forms an acute angle with respect to the two vibration directions of the handrail body 241. Therefore, the granular material 51 in the space 250 can move in a direction that forms an acute angle with the extending direction of the space 250 when it vibrates in either of the two vibration directions. As a result, a relatively large damping effect can be exhibited against vibrations in two directions.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 6, in the present embodiment, the upper swing body 20 of the hydraulic excavator 1 according to the first embodiment is added to the upper surface of the upper swing body 20, more specifically, a fuel tank 25, an operating oil tank 26, a machine. A handrail 80 is further provided for preventing the worker who performs work on the work surface 20a constituted by the upper surfaces of the chamber 27 and the counterweight 28 from falling.

  The handrail 80 is mainly configured by a handrail main body 81 which is a rod-shaped member, and is provided at an edge of the work surface 20a. The handrail main body 81 is formed of a metal pipe, extends vertically from the work surface 20a to a height of about 1 m, and extends horizontally, and spans between adjacent struts 82. It is comprised with the beam part 83 made. The beam portion 83 is connected to the upper end portion of the column portion 82 and is connected to the vertical center portion of the column portion 82. That is, the beam portion 83 is provided at a height of about 1 m vertically above the work surface 20a and a height of about 50 cm. The lower end portion 82a of the column portion 82 is attached to the work surface 20a with a bolt or the like. As shown in FIG. 7, a large number of granular materials 51 are enclosed in a space 350 defined by the inner wall surface of the beam portion 83.

  As described above, in the present embodiment, the granular material 51 vibrates when the handrail main body 81 vibrates, as in the first embodiment, so that the vibration amplitude of the handrail main body 81 can be reduced. Since the handrail 80 for preventing the fall is provided at the edge of the work surface 20a, the vibration amplitude of the handrail 80 is likely to increase, and it is more effective to apply the present invention.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  Although the above-mentioned 1st Embodiment demonstrated the case where the granular material 51 was enclosed in the space 50 in the penetration part 44 in the handrail main body 141, it is not limited to this.

  That is, in the handrail 440 of the first modified example of the first embodiment shown in FIG. 8, the partition wall 49 that partitions the space in the handrail main body 41 in the first embodiment is not provided, and the whole in the handrail main body 441 is not provided. The granular material 51 is enclosed in the space 450.

  In the handrail 540 of the second modified example of the first embodiment shown in FIG. 9, six partition walls 549 that partition the handrail main body 541 into seven spaces 550 are provided. And the granular material 51 is enclosed with the seven spaces 550, respectively. In addition, if the granular material 51 is enclosed in at least one of the seven spaces 550, the effect of the present invention can be obtained, but the effect can be further enhanced when there are more enclosed spaces.

  Furthermore, in the handrail 640 of the third modified example of the first embodiment shown in FIG. 10, the internal space in the vicinity of the central portion 641c farthest from the one end portion 641a and the other end portion 641b in the handrail main body 641 is formed on both sides thereof. A partition wall 649 that partitions from the space is provided. The granular material 51 is enclosed in a space 650 defined by the inner wall of the central portion 641c and the wall surface of the partition wall 649. Since the handrail main body 641 is likely to vibrate at the one end portion 641a and the other end portion 641b at the time of resonance, the vibration amplitude increases at the center portion 641c farthest from the one end portion 641a and the other end portion 641b. Therefore, by enclosing the granular material 51 in the space 650, the granular material 51 can be moved greatly, and a greater damping effect can be exhibited.

  Further, in the first embodiment described above, the handrail body 41 includes the upright portion 42, the first bent portion 42a, the grip portion 43, the second bent portion 43a, the depth portion 44, the third bent portion 44a, and Although the case where it comprised by the descent | fall part 45 was demonstrated, it is not limited to this. In particular, when the main vibration direction of the handrail main body 41 is not parallel to any of the extending directions of the above-described parts, the handrail main body 41 is bent to form a portion parallel to the main vibration direction in order to obtain a large vibration damping effect. It is conceivable to enclose the granular material 51 in the internal space. That is, in the handrail 740 of the fourth modified example of the first embodiment shown in FIG. 11, the parallel portion 746 parallel to the main vibration direction (the direction indicated by the arrow in the drawing) between the inset portion 744 and the descending portion 745. The internal space of the parallel portion 746 is partitioned from the spaces on both sides thereof by a partition wall 749. The granular material 51 is enclosed in a space 750 defined by the inner wall of the parallel portion 746 and the wall surface of the partition wall 749.

  Moreover, although the above-mentioned 4th Embodiment demonstrated the case where the granular material 51 was enclosed in the space 350 in the beam part 83 in the handrail main body 81, it is not limited to this. That is, for example, the granular material 51 may be enclosed in the space in the column portion 82 of the handrail main body 81, or the granular material 51 may be enclosed in the entire space in the handrail main body 81. In addition, you may enclose in the space in the handrail main body 81, Comprising: The space partitioned off by the partition wall.

  Furthermore, in the handrail 880 of the first modified example of the fourth embodiment shown in FIG. 12, it is a cylindrical member extending in the vertical direction between the adjacent support column portions 882, and both ends thereof are respectively connected to the beam portions 883. A connected stiffening member 884 is provided. The granular material 51 is enclosed in a space 850 defined by the inner wall surface of the stiffening member 884. Since the inner wall surface of the stiffening member 884 that defines the space 850 is fixed to the handrail body 881, it vibrates as the handrail body 881 vibrates. Therefore, when the handrail main body 881 vibrates, the granular material 51 vibrates. And since the vibration suppression effect by the granular material 51 is transmitted to the handrail main body 881 via the stiffening member 884, the vibration amplitude of the handrail main body 881 can be reduced. At the same time, the rigidity of the handrail main body 881 can be increased by the stiffening member 884.

  Moreover, in the handrail 980 of the 2nd modification of 4th Embodiment shown in FIG. 13, it extends in the space 950 to the support | pillar part 982 to which the beam part 983 which demarcates the space 950 in which the granular material 51 is enclosed is connected. A stirring member 982a is provided. The stirring member 982a is a bar-like or plate-like member extending in the horizontal direction, and is attached to the surface of the support column 982. Accordingly, the stirring member 982a vibrates as the support column 982 vibrates, and the granular material 51 and the stirring member 982a come into contact with each other. The vibration damping effect can be enhanced by the friction at this time. A large number of protrusions 982b are formed on the surface of the stirring member 982a so that friction with the granular material 51 is increased.

  Further, as shown in FIG. 13, in order to prevent rainwater from entering from the connecting portion between the column portion 982 and the beam portion 983, the column portion 982 has a cylindrical covering portion 982c that covers the end of the beam portion 983. Is provided. In addition, a drainage hole 983 a is formed in the lower portion of the beam portion 983. The diameter of the hole 983a is smaller than the diameter of the granular material 51.

  Moreover, in the handrail 1080 of the 3rd modification of 4th Embodiment shown in FIG. 14, it is between the adjacent support | pillar parts 1082, and the position which hits the antinode of the vibration mode (it shows with the broken line in the figure) of the beam part 1083. A stiffening member 1084 is provided which is a cylindrical member extending in the vertical direction and whose both ends are respectively connected to the beam portion 1083. In this modification, the vibration modes of the two beam portions 1083 arranged in the vertical direction are the same. In addition, the beam portion 1083 located on the right side in FIG. 14 is thinner than the beam portion 1083 located on the left side. The vibration mode of the beam portion 1083 located on the right side has a belly at a position that is a quarter of the total length of the beam portion 1083 from both ends, and the beam portion 1083 located on the left side The vibration mode has a belly at the center.

  The granular material 51 is enclosed in a space 1050 defined by the inner wall surface of the stiffening member 1084. Further, the beam portion 1083 is provided with a bar-like or plate-like stirring member 1083 a extending in the vertical direction in the space 1050 in the stiffening member 1084. As described above, since the stirring member 1083a is provided at a position where the amplitude of the beam portion 1083 is the largest, the relative displacement between the stirring member 1083a and the granular material 51 can be increased. Thereby, since the friction between the granular material 51 and the stirring member 1083a is increased, a greater vibration damping effect can be obtained.

  Further, in the handrail 1180 of the fourth modified example of the fourth embodiment shown in FIG. 15, the upper beam portion 1183 of the two beam portions 1183 arranged in the vertical direction is compared with the lower beam portion 1183. They are thicker and their natural frequencies are different. Therefore, the vibration modes (indicated by broken lines in the figure) of these two beam portions 1183 are deviated. That is, the vibration mode of the beam portion 1183 located above has a belly at the center, and the vibration mode of the beam portion 1183 located below is one-fourth of the total length of the beam portion 1183 from both ends. Has a belly in the position of the length.

  In addition, a stiffening member 1184 is provided between the column portion 1182 located on the leftmost side in FIG. 15 and the column portion 1182 located at the center at a position corresponding to the belly of the beam portion 1183 located above. . In addition, a stiffening member 1184 is provided between the column portion 1182 located on the rightmost side in FIG. 14 and the column portion 1182 located in the center at a position corresponding to the belly of the beam portion 1183 located below. . The stiffening member 1184 is a cylindrical member extending in the vertical direction, and both ends thereof are connected to the beam portions 1183, respectively. The granular material 51 is enclosed in a space 1150 defined by the inner wall surface of the stiffening member 1184. Further, the beam portion 1183 is provided with a stirrer member 1183a having a bar shape or a plate shape extending in the vertical direction in the space 1150 in the stiffening member 1184. Thereby, the relative displacement of the stirring member 1183a and the granular material 51 can be increased, and a greater attenuation effect can be obtained.

  In the third and fourth modified examples of the fourth embodiment described above, the case where the vibration mode is changed by changing the thickness of the beam portion 1083 (1183) has been described. However, the vibration of the beam portion 1083 (1183) is described. The mode can also be changed by changing its length, pipe thickness, material, etc.

  Furthermore, in the above-described first embodiment and its modification, and in the fourth embodiment and its second modification, the granular material 51 is enclosed inside the handrail body 41 (81, 441-741, 981). And in the second and third embodiments and the first, third, and fourth variations of the fourth embodiment, stiffening members 146, 147 (246, 884, 1084, 1184). Although the case where the granular material 51 was enclosed in the inside was demonstrated, it is not limited to these. The granular material 51 should just be enclosed in the space defined by the wall surface which vibrates with the vibration of the handrail main body 41 (141-741, 81, 881-1181).

  Further, the stirring member 982a (1083a, 1083a) described in the second to fourth modifications of the above-described fourth embodiment can also be applied to the handrail 40 of the first embodiment. That is, a stirring member extending into the space 50 may be provided on the partition wall 49 of the handrail 40.

  In addition, the application of the present invention is not limited to a hydraulic excavator which is an example of a construction machine, and can be applied to a construction machine in general, and further to a vibrating machine in general.

1 Excavator (machine)
40-640, 80, 880-1180 Handrail 41-641, 81, 881, 1181 Handrail main body 50-650 Space 49, 449-649 Partition wall 51 Granular body 82, 882-1182 Post section 83, 883-1183 Beam section 146 147, 246, 884, 1084, 1184 Stiffening member (fixing member)
982a-1183a Stirrer 982b Protrusion

Claims (14)

A handrail attached to a vibrating machine,
A handrail body which is a rod-shaped member and whose end is attached to the machine body;
With a granular material,
The handrail characterized in that the granular material is enclosed in a space defined by a wall surface that vibrates with vibration of the handrail main body.   The handrail according to claim 1, wherein the handrail body is a hollow member, and the granular material is enclosed in a space defined by an inner wall of the handrail body. A partition wall for partitioning a space defined by the hollow inner wall of the handrail body into a plurality of spaces;
The handrail according to claim 2, wherein the granular material is enclosed in at least one of a plurality of spaces partitioned by the partition wall.   The handrail according to claim 3, wherein the wall surface defining the space in which the granular material is enclosed includes an inner wall of a portion where the amplitude becomes maximum when the handrail body vibrates.   The handrail according to claim 1, further comprising a fixing member fixed to the handrail body and having a wall surface defining a space in which the granular material is enclosed. The handrail body has a bent portion;
The handrail according to claim 5, wherein the fixing member is a tubular member having both ends fixed to two portions sandwiching the bent portion of the handrail main body.   The handrail according to any one of claims 1 to 6, wherein a space in which the granular material is enclosed extends along a main vibration direction of the handrail main body. The handrail body vibrates in a plurality of different directions,
A space in which the granular material is enclosed extends in first and second directions which are at least two directions among a plurality of vibration directions of the handrail main body, and one end thereof is connected to each other. The handrail according to any one of claims 1 to 7, wherein the handrail has a second space and a second space. The handrail body vibrates in a plurality of different directions,
The space in which the granular material is enclosed extends in a direction that forms an acute angle with respect to the first and second directions, which are at least two directions among a plurality of vibration directions of the handrail main body. The handrail according to any one of claims 1 to 6.   2. A stirring member fixed to the handrail main body and disposed in a space in which the granular material is enclosed, and further comprising a stirring member extending along a longitudinal direction of the space. The handrail according to any one of 9.   The handrail according to claim 10, wherein a protrusion is formed on a surface of the stirring member. The handrail main body includes a plurality of support columns extending in the vertical direction and a plurality of beams extending in the horizontal direction and spanned between adjacent support columns,
The space in which the granular material is enclosed is defined by wall surfaces extending in the vertical direction and having both ends connected to the beam portions, respectively.
The handrail according to claim 10 or 11, wherein the stirring member is provided at a position corresponding to an antinode of a vibration mode of the beam portion. The handrail main body includes a plurality of support columns extending in the vertical direction and a plurality of beams extending in the horizontal direction and spanned between adjacent support columns,
The space in which the granular material is enclosed is defined by wall surfaces extending in the vertical direction and having both ends connected to the beam portions, respectively.
The handrail according to claim 10 or 11, wherein the natural frequencies of the two beam portions to which both ends of a wall surface defining a space in which the granular material is enclosed are connected are different.   The machine provided with the handrail of any one of Claims 1-13.

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