JP2015031138A - Tamping plate for rammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tamping plate for a rammer, which has a configuration that can prevent the tamping plate from being bent and reduce the tamping plate replacement frequency.SOLUTION: A rammer is configured so that it has a mechanism to convert engine output into a vertical linear reciprocating motion of a vibrator and is provided with a tamping plate at the lower end of the vibrator. A plywood is configured by adhesively integrating a plurality of longitudinal veneers 20a composed of fibers in a longitudinal direction (front-back direction) of the rammer and crosswise veneers 20b composed of fibers in a left-side direction of the rammer, respectively. A ratio r=T/Y between a total thickness T of the longitudinal veneers 20a and a total thickness Y of the crosswise veneers 20b is set within a range between 4/3 or larger and 4/1 or less.

Description

  The present invention relates to a rolling plate provided at a lower end portion of a vibrating body in a rammer having a mechanism for converting engine output into a vertical reciprocating motion of the vibrating body.

  The rammer is configured by attaching a cylindrical body containing a vibrating body that vibrates up and down to the lower part of the structure including the engine and the handle, and providing a rolling plate at the lower part of the vibrating body. Such a rammer is configured so that the relative width of the rolling plate with respect to the height is narrower than that of other compacting machines, and the center of gravity is at a high position. Unstable.

  As described in Patent Document 1, the rolling plate used in such a rammers is made of wooden plywood to reduce impact during rolling, and the front and back surfaces of the plywood are sandwiched between iron plates, and bolts and nuts are used. Constructed by fastening. In such a rolling plate, as shown in FIG. 11, there is a case where the direction of the fiber 30 is a longitudinal single plate (hereinafter, referred to as a vertical single plate) in which the direction of the fiber is the front-rear direction (shown by an arrow X). ) 31 and plywood 33 in which the direction of the fiber 30 is a horizontal plate (hereinafter, sometimes referred to as a horizontal single plate) 32 are alternately stacked and bonded with an iron plate. It was. The reason for this configuration is that the strength of bending of the plywood is intended to be the same in both length and width in consideration of increasing the bending resistance in the direction in which the direction of the fiber 30 is perpendicular to the direction. It is.

  When such a plywood 33 is configured, conventionally, as shown in FIG. 12, the plywoods 34 and 35 having three single plates 31 and 32 as one sheet are alternately arranged in the direction of the fibers 30 by 90 degrees. They are laminated so that they change, and are bonded together. That is, the plywoods 34 and 35 are stacked with the directions of the fibers 30 being different by 90 degrees. When a total of eight such plywoods 34 and 35 are used, the ratio r = T / Y of the total number (total thickness) T of the vertical single plates 31 and the total number (total thickness) Y of the horizontal single plates 32 is: 1/1. Further, when the total number of the plywoods 34 and 35 is nine, r = T / Y is 14/13.

Japanese Utility Model Publication No. 1-61207

  Ranma is a machine that compacts a ground surface by rolling it with a rolling plate. In such a rolling operation, when the rolling plate is rolled while moving forward, if a crushed stone protrudes from the road surface in front of the rolling plate, the rolling plate is interposed between the runner foot and the rolling plate at the lower end of the vibrating body. A bending moment is generated that pushes up the front part. When the rolling plate continues to receive such a bending moment, the rolling plate is gradually deformed into a curved shape in the front-rear direction, and as a result, the rolling plate is easily tilted and the rolling plate needs to be replaced.

  In view of the above problems, an object of the present invention is to provide a Ramma rolling plate having a configuration in which the rolling plate is less likely to be bent and the frequency of replacement of the rolling plate can be reduced.

The rolling plate of the lammer according to claim 1 has a mechanism for converting engine output into a linear reciprocating motion of the vibrating body, and a rolling plate of the lammer configured by providing a rolling plate at the lower end of the vibrating body.
It is provided with a plywood in which the longitudinal direction of the longitudinal fibers whose fiber direction is the front and back direction of the lama and the transverse direction of the transverse fibers are included and integrated by adhesion.
The ratio r = T / Y of the total thickness T of the longitudinal single plate and the total thickness Y of the horizontal single plate is set in a range of 4/3 or more and 4/1 or less,
The front and back surfaces of the integrated plywood are sandwiched between iron plates and fastened with bolts and nuts.

The rolling plate according to claim 2, wherein the rolling plate according to claim 1 is:
Among the plywoods, the highest and lowest single plates are longitudinal single plates.

The rolling plate according to claim 3 is the rolling plate according to claim 1 or 2,
A plywood is constructed by adhering a horizontal veneer between two vertical veneers,
A plurality of the plywoods are overlapped and fixed integrally so that the fiber directions of the two longitudinal single plates coincide.

The rolling plate according to claim 4 has a mechanism for converting engine output into a vertical reciprocating motion of the vibrating body, and a rolling plate of a lammer configured by providing a rolling plate at the lower end of the vibrating body.
Single veneer whose fiber direction is inclined at an inclination angle of 5 to 40 degrees with respect to the longitudinal direction of the ramma is fixed to a plurality of sheets, with the direction of inclination between adjacent single plates opposite to each other. To make plywood,
The front and back surfaces of the plywood are sandwiched between iron plates and fastened with bolts and nuts.

  According to the invention of claim 1, the ratio r = T / Y of the total thickness T of the longitudinal single plate and the total thickness Y of the horizontal single plate is in a range of 4/3 or more and 4/1 or less, which is larger than the conventional one. Since it set, the deformation | transformation by which the front part of a rolling plate bends upward is suppressed, it becomes difficult for a ramper to fall, and the replacement frequency of a rolling plate can be decreased.

  According to the second aspect of the present invention, since the uppermost plate and the lowermost single plate are formed as vertical single plates, the upward bending of the front end portion of the rolling plate that requires the highest bending strength is further suppressed.

  According to the invention of claim 3, an elemental board is configured by adhering a horizontal eyelet sheet between two longitudinal eyeplates, and a plurality of the elemental boards are formed of fibers of two longitudinal eyeplates. Since the plywood is constructed by overlapping and fixing together so that the directions are the same, the bending strength in the vertical direction and the bending strength in the horizontal direction of the plywood are ensured in a well-balanced manner.

  According to a fourth aspect of the present invention, there is provided a plurality of laminar compaction plates having a fiber direction inclined in a range of 5 to 40 degrees, which is the longitudinal direction of the rammer, so that the inclination directions are alternately opposite to each other. Since the plywood is formed by stacking and fixing the sheets, deformation of the front part including the oblique front part of the compaction plate that is bent upward is suppressed, the ramma is not easily toppled, and the frequency of replacement of the compaction plate can be reduced. . Moreover, the deformation | transformation which the side part of a rolling plate rises can also be suppressed.

It is a side view which shows an example of the rammer to which the rolling plate by this invention is applied. It is a side view which shows one Embodiment of the rolling plate by this invention in the state attached to the vibrating body. It is a perspective view which shows one Embodiment of the rolling plate by this invention. It is a side view which shows the structural example of the plywood which comprises the compaction board of FIG. It is a perspective view which shows the elementary plywood which comprises the plywood of FIG. It is a graph which shows the characteristic regarding the change of the bending amount with respect to the load of the plywood by this invention and the conventional plywood. It is a perspective view which shows the other example of the union board which comprises the compaction board of this invention. It is a perspective view which shows the further another example of the element board which comprises the rolling compaction board of this invention. It is a perspective view which shows the further another example of the element board which comprises the rolling compaction board of this invention. (A) is the partial side view which shows the other example of the plywood of the compaction board of this invention, (B) is the perspective view. It is a side view which shows the structure of the plywood of the conventional rolling compaction board. It is a perspective view which shows arrangement | positioning of the elementary plywood which comprises the plywood of the conventional rolling plate.

  FIG. 1 is a side view showing an example of a runner to which a conveying apparatus according to the present invention is applied. In FIG. 1, reference numeral 1 denotes an upper structure of a rammer. The upper structure 1 includes an engine 2, a fuel tank 3, a handle 4, and the like. During the rolling operation, the handle 4 is a portion that the rear end 4a grips by the operator.

  A cylindrical body 5 is provided below the structure 1, and a vibrating body 7 is accommodated in the cylindrical body 5. The vibrating body 7 is vibrated up and down via a power transmission mechanism 6 that converts rotation of the engine 2 into vertical linear vibration. Reference numeral 8 denotes a rolling plate that is attached to a runner foot 7 a at the lower end of the vibrating body 7 with a bolt 9 and a nut 10 in the structure described later. In FIG. 1, an arrow X indicates a forward direction when performing the rolling operation. The center of gravity of the rammer is configured so as to be located substantially on the center of the flat portion of the iron plate 13 that serves as the bottom plate of the rolling plate 8, whereby the rammer is self-supporting when the rolling plate 8 is placed on the horizontal ground. .

  FIG. 2 is a side view showing the mounting structure of the compaction plate 8, and FIG. 3 is a perspective view showing the main body of the compaction plate 8. 2 and 3, reference numeral 12 denotes a plywood, and the compaction plate 8 has the plywood 12, the iron plate 13 serving as the bottom plate thereof, and the support iron plate 14 provided on the surface thereof passed through the through holes provided therein. The bolt 16 and the nut 17 are integrally connected. The rolling plate 8 is attached to the runner foot 7a by screwing the bolt 9 into a nut 10 in a through hole provided in the iron plate 13, the plywood 12 and the runner foot 7a constituting the bottom plate and fastening them. The rolling plate 8 has a structure in which the front end 8a is inclined upward so that smooth advancement in the rolling operation is possible.

  FIG. 4 is a side view showing a configuration example of the plywood 12 constituting the rolling plate 8 shown in FIGS. FIG. 5 is a perspective view showing the arrangement of the plywood 20 constituting the plywood 12 of this example. As shown in FIG. 3, this plywood 12 is one in which the single plywood 20 is sandwiched between two longitudinal single plates 20 a, 20 a and bonded together by bonding. is there. Then, as shown in FIG. 5, a plurality of the laminated plates 20 are stacked and bonded so that the direction of the fibers 19 of the two longitudinal single plates 20a, 20a coincides with the direction of the runner indicated by the arrow X. As a result, the plywood 12 is constructed as shown in FIG. If configured in this way, the total number of the vertical single plates 20a: The total number of the horizontal single plates 20b is 2/1. If the thicknesses of the single plates 20a and 20b are the same, the ratio r = T / Y of the total thickness T of the vertical single plate 20a to the total thickness Y of the horizontal single plate 20b is also 2/1.

  FIG. 6 shows a case where the same number of vertical single plates 20a and horizontal single plates 20b are stacked as in the conventional example shown in FIG. 11, and a vertical single plate 20a and horizontal single plate 20b as shown in FIG. The bending strength test result about the front-back direction at the time of overlapping by making ratio r of thickness of 2/1 into 2 is shown. FIG. 6 (A) is a diagram showing an embodiment of this strength test. The test piece 23 is supported by two support portions 22 and 22 in the longitudinal direction in the longitudinal direction, and a load is applied to the center between these support portions 22 and 22. W was added to measure the displacement δ at the center. The number of single plates of the test piece 23 was the same, and in the case of the conventional structure, the ratio of the thickness T of the vertical single plate to the thickness Y of the horizontal single plate r = T / Y was 14/13.

  As shown in FIG. 6B, the load W2 leading to the break in the case of the present invention was about twice the load W1 leading to the break in the case of the conventional example (W2 / W1≈2). Further, the displacement amount δ2 leading to the fracture in the case of the present invention is about 3/2 times (δ2 / δ1≈3 / 2) the displacement amount δ1 leading to the fracture in the case of the conventional example. Further, the displacement amount δ4 in the case of the present invention with respect to a certain load W3 before rupture is as small as about 2/3 (δ4 / δ3≈2 / 3) with respect to the displacement amount δ3 in the conventional example. Thus, it was found that the bending amount can be suppressed. Thus, by increasing the ratio of the number (thickness) of the vertical single plates 20a to the number (thickness) of the horizontal single plates 20b, the strength against the force in the direction in which the front portion 8a of the rolling plate 8 bends upward is increased. Rises and deformation is suppressed. For this reason, it becomes difficult for the hammer to fall, and the replacement frequency of the rolling plate 8 can be reduced.

  FIG. 7 is a perspective view showing another example of the plywood used in the present invention. In the base plate 20A, the uppermost and lowermost single plates are formed as vertical single plates 20a, and the horizontal single plates 20b and the vertical single plates 20a are alternately arranged so that the total number of single plates is five. Then, they are stacked and integrated by bonding. By integrating a plurality of such laminated boards 20A so that the directions of the fibers of the vertical single plate 20a and the horizontal single plate 20b coincide with each other, the total thickness T of the vertical single plate 20a: horizontal single plate A plywood in which the ratio r = T / Y to the total thickness Y of 20b is 3/2 can be created, and a plywood in which bending deformation in the front-rear direction is suppressed can be obtained.

  FIG. 8 is a perspective view further showing another example of the plywood used in the present invention. In this union board 20B, the uppermost and lowermost single plates are the vertical single plates 20a, and the five horizontal single plates 20b and the vertical single plates 20a are alternately arranged between them, and the total number is seven. It is piled up so as to be integrated by bonding. Such a laminated board 20B is overlapped and integrated so that the directions of the longitudinal single plates 20a coincide with each other, so that the ratio of the total thickness of the longitudinal single plates 20a to the total thickness of the horizontal single plates 20b is 4/3. A plywood can be created. In order to obtain a plywood in which bending deformation in the front-rear direction is suppressed as compared with the prior art, as shown in FIG. 8, the ratio of the total thickness T of the vertical single plate 20a to the total thickness Y of the horizontal single plate 20b, r = T It is desirable that / Y be 4/3 or more.

  FIG. 9 is a perspective view further showing another example of the plywood used in the present invention. The base plate 20C is provided with two vertical single plates 20a on the upper and lower sides, and the horizontal single plate 20b is overlapped between these two vertical single plates 20a and integrated by bonding. . By stacking and integrating a plurality of such laminated boards 20C so that the fiber directions of the vertical single plate 20a and the horizontal single plate 20b coincide, the total thickness of the vertical single plate 20a: horizontal single plate 20b A plywood having a total thickness ratio of 4/1 can be created, and a plywood can be obtained in which bending deformation in the front-rear direction can be further suppressed than the plywood in each of the above examples. In order to suppress lateral bending deformation, it is desirable that the ratio r = T / Y of the total thickness T of the vertical single plate 20a to the total thickness Y of the horizontal single plate 20b is 4/1 or less.

  In this way, the ratio r = T / Y of the total thickness T of the vertical single veneer 20a and the total thickness Y of the horizontal single veneer 20b is set in the range of 4/3 or more and 4/1 or less. Since the deformation | transformation which the front part of the pressure plate 8 bends upward is suppressed, it becomes difficult for a rammer to fall down and the replacement frequency of a pressure plate can be decreased. Further, by providing the horizontal single plate 20b, the upward bending of the left and right side portions of the rolling plate 8 is also suppressed.

  Moreover, the deformation | transformation which the front part of the compaction board 8 bends upward is suppressed by making the direction of the uppermost and the lowest order fiber into the vertical direction among the single plates which comprise the compaction board 8, and a rammer does not fall easily. Thus, the replacement frequency of the rolling plate can be reduced.

  FIG. 10A is a partial side view showing another example of the plywood of the rolling plate of the present invention, and FIG. 10B is a perspective view thereof. The plywood in this example is such that the direction of the fibers 19 is inclined with respect to the longitudinal direction of the runner indicated by the arrow X, and the direction of inclination between the single plates (slanted single plates) 20d and 20e adjacent to each other is reversed. A plurality of plywoods are integrally fixed to each other.

  As shown in FIG. 10, the direction of the fibers 19 of the oblique single plates 20d and 20e adjacent to each other is inclined, and the inclination angle θ of the fibers 19 with respect to the advancing direction X of the ramma is set to be smaller than 45 degrees. Deformation in which the front part including the oblique front part of the pressure plate bends upward is suppressed, the ramper is less likely to fall, and the frequency of replacement of the pressure plate can be reduced. Here, in order to increase the bending suppression effect of the front portion of the rolling plate relative to the advancing direction X of the luma, the inclination angle θ of the fiber 19 is preferably 40 degrees or less, and 30 degrees or less. Is more preferable. Further, in order to suppress the bending of the side portion of the rolling plate 8, the inclination angle θ is preferably 5 degrees or more, and more preferably 15 degrees or more.

  In the above embodiment, the single plates 20a, 20b, 20d, and 20e constituting the plywood have the same thickness, but those having different thicknesses may be used. When implementing the present invention, various modifications and additions are possible without departing from the scope of the present invention.

1: upper structure, 2: engine, 3: fuel tank, 4: handle, 5: cylindrical body, 6: power transmission mechanism, 7: vibrator, 8: rolling plate, 9: bolt, 10: nut, 12 : Plywood, 13: Iron plate, 14: Support iron plate, 16: Bolt, 17: Nut, 19: Fiber, 20, 20A to 20C: Elementary plywood, 20a: Long single plate, 20b: Horizontal single plate, 20d, 20e: Oblique veneer

Claims (4)

While having a mechanism for converting the engine output into the vertical linear reciprocating motion of the vibrating body, and providing the rolling plate at the lower end of the vibrating body,
It is provided with a plywood in which the longitudinal direction of the longitudinal fibers whose fiber direction is the front and back direction of the lama and the transverse direction of the transverse fibers are included and integrated by adhesion.
The ratio T / Y of the total thickness T of the vertical eye veneer and the total thickness Y of the horizontal eye veneer is set in the range of 4/3 or more and 4/1 or less,
A rolled roller for a lammer, wherein the integrated plywood is sandwiched between steel plates and fastened with bolts and nuts. The rolling plate according to claim 1, wherein:
Among the above-mentioned plywoods, the uppermost and lowermost single plates are longitudinal single plates. The rolling plate according to claim 1 or 2, wherein
A plywood is constructed by adhering a horizontal veneer between two vertical veneers,
A laminating compaction plate, wherein a plurality of the laminated plates are stacked and fixed together. While having a mechanism for converting the engine output into the vertical linear reciprocating motion of the vibrating body, and providing the rolling plate at the lower end of the vibrating body,
Single veneer whose fiber direction is inclined at an inclination angle of 5 to 40 degrees with respect to the longitudinal direction of the ramma is fixed to a plurality of sheets, with the direction of inclination between adjacent single plates opposite to each other. To make plywood,
A rolling plate for a lammer characterized in that the front and back surfaces of the plywood are sandwiched between iron plates and fastened with bolts and nuts.

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