JP4099101B2 - Twin head type chiseling machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is one of hydraulic attachments attached to an arm of a hydraulic excavator, and relates to a twin-head type chiseling machine that performs a chiseling work on a concrete surface with a bit attached to the outer periphery of a twin rotary drum.
[0002]
[Prior art]
FIG. 6 is a perspective view showing an overall view of the hydraulic excavator. As shown in FIG. 6, the excavator 20 includes a track frame 21 that moves forward and backward, a cab (cabin) 22, a boom 23 that forms a link mechanism, an arm 24, and a bucket 25. In order to move, a boom cylinder 23a, an arm cylinder 24a, a bucket cylinder 25a, and the like are provided, and the bucket 25 is provided with a tooth 25c so as to be convenient for scooping up a processed material.
[0003]
FIG. 7 is a perspective view showing a state in which a hydraulic attachment is mounted on the arm 24 of the conventional excavator 20. As shown in FIG. 7, a drum cutter 26 is known in which the pins 19 and 19 that support the bucket 25 of the excavator 20 are pulled out, the bucket 25 (see FIG. 6) is removed, and instead attached (for example, Patent Document 1). Since this drum cutter 26 has a structure in which the two drums 27 and 27 are rotated by using one hydraulic motor, the drum cutter 26 has a structure in which a high speed hydraulic motor is used to decelerate using a gear reduction mechanism to obtain a force. It has become. This drum cutter 26 is used when excavating hard ground mainly in civil engineering work.
[0004]
[Patent Document 1]
JP 61-225494 A (FIGS. 1, 2, and 3)
[0005]
[Problems to be solved by the invention]
However, in this drum cutter 26, the cutting resistance acting on the bit is unstable, and the increase / decrease always changes drastically. For this reason, when vibration is generated during cutting, the structure is complicated, the number of parts is large, reliability is insufficient, and there is a problem that the hydraulic excavator is highly defective. In addition, since the conventional product has two shafts, it is a heavy product, is inconvenient and has been desired to be light.
[0006]
Therefore, the present invention was devised to solve such a conventional problem, and while reducing the weight and simplifying the structure of the twin head and reducing the number of parts, the twin head having high reliability. It is an object to provide a type chipping machine.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the twin-head type chiseling machine according to claim 1 is a twin-head type chiseling machine that is detachably attached to the tip of an arm of a hydraulic excavator and has two rotating heads. A top bracket connected to the front end, a main body frame connected to the top bracket, with a bearing outer race fixed to support the two rotating heads, and inserted into a through hole provided in the main body frame. Is connected to the left and right ends of the shaft, and is connected to the output shaft of the hydraulic motor, and is connected to the output shaft of the hydraulic motor. The inner race of the bearing is fixed, and can be rotated by the bearing. A head guide supported by a shaft, and a bit holder fixed to the head guide and for inserting a bit serving as a cutting blade. There are bonded is arranged spirally, a rotary head arranged on left and right, it is inserted into the bit holder of the rotary head, e Bei a plurality of bits chipping the upper surface of the workpiece, and
The main body frame is connected to the top bracket at one end in the left-right direction at the top in a side view and is surrounded by the top bracket at the other end, and a vertical gap between the top bracket and the main body frame. It is characterized by being connected via a cushion .
[0008]
According to the first aspect of the present invention, there is provided a twin-head type chiseling machine having a simple twin head structure, reducing the weight with a single shaft, reducing the number of parts, and having high reliability. be able to. In addition, the twin head type chiseling machine is lighter and can be easily handled by an excavator. Further, the main body frame is connected to the top bracket at one end in the left-right direction at the top in a side view and is surrounded by the top bracket at the other end, and the vertical direction between the top bracket and the main body frame is Since the cushion is interposed in the gap, the vibration in the circumferential direction that occurs during the chipping operation can be absorbed by the cushion, so that the vibration that occurs during the chipping operation can be reduced. Further, the adverse effect on the excavator is reduced, the excavator failure is reduced, the vibration and noise transmitted to the operator who operates the excavator are reduced, and the burden on the operator can be eliminated .
[0009]
The invention according to claim 2 is the twin head type chipping machine according to claim 1, wherein the bearing is a turntable bearing with a seal, and the outer race and the inner race have a plurality of bolt through holes. The outer race is fixed to the main body frame with a bolt, and the inner race is fixed to a head guide integrated with the rotary head with a bolt .
[0010]
According to the second aspect of the present invention, the outer race is fixed to the main body frame by the bolt, and the inner race is fixed to the head guide integrated with the rotary head by the bolt, thereby providing a bearing resistant to vibration. Further, the head guide can be prevented from coming off by causing the ball of the bearing to function, so that it is not necessary to perform the actual processing of the head cover.
[0011]
The invention described in claim 3 is the twin head type chipping machine according to claim 1, wherein the two hydraulic motors are connected to both ends of a shaft disposed in the center of the main body frame. .
[0012]
According to invention of Claim 3, the rotational speed of two hydraulic motors can be made the same.
[0013]
According to a fourth aspect of the present invention, there is provided the twin-head type chipping machine according to the first aspect, wherein the head of the rotary head is formed in a drum shape, and an inner peripheral surface of the head is provided with the main body frame. An O-ring that is in close contact with the inner peripheral surface of the head is provided on both side surfaces via rings, and a head bearing formed of MC nylon (registered trademark) is provided.
[0014]
According to the fourth aspect of the present invention, it is possible to prevent the occurrence of failure by double preventing sand and the like from entering.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an overall view of a twin-head type chiseling machine 10 mounted on a hydraulic excavator 20, (a) is a perspective view thereof, and (b) is a front view of the twin-head type chiseling machine 10 shown in FIG. Fig. 3 (c) is an enlarged side view taken along arrow D shown in (b). 2 is a cross-sectional view taken along line AA shown in FIG. 1A, and FIG. 3 is a side view taken along arrow B shown in FIG.
As shown in FIG. 1, the twin-head type chipping machine 10 is a hydraulic attachment that crushes surfaces such as a concrete pavement surface, an asphalt pavement surface, and a mortar wall of a structure surface.
The twin head type chipping machine 10 is replaceable with a bucket 25 (see FIG. 6), and is fixed to the tip of the arm 24 of the excavator 20 by two pins 19 and 19.
As shown in FIGS. 1, 2, and 3, the twin head type chipping machine 10 includes a top bracket 1, a main body frame 2, a shaft 3, hydraulic motors 4 and 4, head guides 5 and 5, bearings 6 and 6, and rotation. It is composed of heads 7, 7 and a plurality of bits 9, 9,.
[0020]
As shown in FIG. 2, the top bracket 1 has holes 1 a and 1 a connected by pins 19 and 19, and holes 1 b and 1 b connecting the main body frame 2 to the distal end portion of the arm 25, and guides the hydraulic source. The manifold block 13 is fixed, and hydraulic hoses 14 (14a, 14b, 14c) are connected.
Body frame 2, symmetrically, each ring 2e, which is integrally fixed to the body frame 2, the head bearing 12 in a groove provided on the outer periphery of the ring 2f is loosely fitted by a ring 2f bolt 2b .
Further, the outer race 6a of the bearing 6 is fixed to the end surface of the ring 2f.
[0021]
As shown in FIG. 3, the main body frame 2 is connected by one right pin 2 a, the left side of the main body frame 2 is surrounded by the top bracket 1, and the cushion 2 c is the left side of the main body frame 2. It is sandwiched between the upper surface and the lower surface of the top bracket 1. The cushion 2c is sandwiched between three sheets and is held by an adjusting bolt 2e. One cushion 2d is sandwiched between the lower surface on the left side of the main body frame 2 and the upper surface of the surrounding top bracket 1.
For this reason, it can be slightly swung about the pin 2a by the elastic deformation by the cushions 2c and 2d. The material of the cushions 2c and 2d is rubber, and for example, nitrile rubber is suitable.
As a result, since the circumferential vibration generated during the chipping operation can be absorbed by the cushions 2c and 2d, the chipping can be performed smoothly.
On the other hand, a shaft 3 is inserted into a through hole (see FIG. 2) provided in the lower part of the main body frame 2, and serrations are engraved on both ends of the shaft 3.
[0022]
As shown in FIG. 2, the hydraulic motors 4 and 4 are hydraulic motors that enable low-speed rotation. The hydraulic motor 4 is connected to both ends of the shaft 3 disposed in the center of the main body frame 2, and serrations are also engraved on the outer periphery of the shaft end of the output shaft 4 a of the hydraulic motor 4. In this way, the structure is simplified by using two hydraulic motors 4, one on each of the left and right sides, for each shaft, and incorporating them inside the rotary drums 7, 7. Since the portion can be covered, there is no direct entry of fine sand or the like, and the occurrence of failure can be suppressed.
[0023]
The bearing 6 is a turntable bearing with a seal, and as shown in FIG. 2, is composed of an outer race 6 a, an inner race 6 b, balls 6 c, 6 c, etc. symmetrically, and the outer race 6 a is fixed to the main body frame 2. The inner race 6 b is fixed to the head guide 5. The allowable thrust load of the bearing 6 is, for example, 630 kN.
[0024]
The head guide 5 meshes with the serration of the output shaft 4a of the hydraulic motor 4, the inner race 6b of the bearing 6 is fixed to the head guide 5, and the rotary heads 7 arranged on the left and right are fixed. By preventing the head guide 5 from coming off, the ball 6c of the bearing 6 is made to function so that the actual processing of the head cover 5 becomes unnecessary.
[0025]
The rotary head 7 is formed in a drum shape, and one end thereof is closed with an opening 7 a at the center, and the inner peripheral surface 7 b of this end is fitted to the outer peripheral surface of the head guide 5. It is fixed to the end face. A head cover 11 holding an O-ring for preventing entry of fine sand or the like is inserted into the opening 7 a of the rotary head 7 and fixed to the end face of the output shaft 4 a of the hydraulic motor 4.
The head 7c formed in a drum shape is provided with a head bearing 12 via an O-ring that is in close contact with the inner peripheral surface of the head 7c, thereby preventing entry of fine sand or the like. The head bearing 12 is made of MC nylon (registered trademark) , and since the frictional resistance between the O-ring and MC nylon (registered trademark) is extremely small, damage due to wear of the O-ring is small. It is loosely fitted between the grooves formed by the head bearing 12 and the ring 2e and the ring 2f of the main body frame 2.
Further, a seal (not shown) is arranged on the main body frame 2 at the end of the head 7c, and rotates while always in contact with the inner peripheral surface of the head 7c, thereby preventing entry of fine sand and the like. A cover (not shown) made of a steel plate is attached to the end face of the head 7c to prevent intrusion of coarse sand and water.
As a result, reliability is improved by these measures.
[0026]
Next, as shown in FIG. 3, a plurality of bit holders 8, 8... For inserting the bits 9, 9,.
As shown in FIG. 1B, for example, the arrangement of the bit holders 8, 8... And the lead angle α of the ribs 7d is 15 ° with respect to the end face of the rotary head 7, and It is formed like this. Since the ribs 7d are provided spirally on both sides of the bit holder 8 in this way, the bit holder 8 can be welded to the ribs 7d, so that the bit struts against the cutting force are strong and the strength of the rotary head 7 is also high. Strengthens and prevents deformation.
[0027]
As shown in FIG. 3, the bit holder 8 is radially welded so that the bit 9 is inserted perpendicularly to the outer peripheral surface of the rotary head 7. As shown in FIG. 1 (c), the bit holder 8 is provided with a square hole in a plan view for inserting the bit 9, and the bit holder 8 is viewed from the front as an insertion port for the retaining pin of the bit 9. But the square hole is open. Each of the left and right rotary heads 7, 7 is provided with 28 bits 9, 9,... At predetermined positions. When high-pressure oil flows into the hydraulic motor, the rotary drums 7, 7 are counterclockwise (FIG. 3). Rotate to bite asphalt pavement and concrete surface.
[0028]
The hydraulic fluid supplied from the hydraulic device is supplied to the hydraulic motors 4, 4 provided on the left and right via the hydraulic manifold block 13 by the hydraulic hose 14. As shown in FIG. 2, an IN hydraulic hose 14a, an OUT hydraulic hose 14b, and a drain hydraulic hose 14c are connected to the left and right hydraulic motors 4 and 4 from the hydraulic manifold block 13, respectively.
[0029]
Next, with reference to FIG. 1 and FIG. 2, a method for mounting the twin head type chipping machine 10 will be described. First, the pins 19 and 19 of the bucket 25 (see FIG. 6) of the excavator 20 are first removed, the bucket 25 is removed, and the twin-head chiseling machine 10 is attached and supported. Pins 19 and 19 are inserted into (see FIG. 3) and fixed.
A hydraulic hose 14, which is a hydraulic pipe, is connected to the hydraulic device of the excavator 20 and the hydraulic manifold block 13 so that the hydraulic motors 4 and 4 can be driven.
The hydraulic hose 14 is an IN hydraulic hose 14a, an OUT hydraulic hose 14b, and a drain hydraulic hose 14c.
[0030]
Here, the operation of the chipping by the twin head type chipping machine 10 will be described.
4A and 4B are explanatory views for explaining the operation with respect to the floor surface. FIG. 4A is a side view showing the posture before entering the chip, FIG. 4B is a side view showing the start of the chip, and FIG. c) is a side view showing a posture in which chipping is performed.
As shown in FIG. 4 (a), a twin head type chipping machine (hereinafter referred to as a chipping machine) 10 rotates a rotary head 7 counterclockwise (see FIG. 3), Crush the concrete surface F.
First, the piston rod 25b of the bucket cylinder 25a (see FIG. 1) of the arm 24 is extended, and the posture is adjusted to a position where the bit 9 of the chiseling machine 10 is easy to see.
As shown in FIG. 4B, the arm cylinder 24a (see FIG. 1) is operated to approach the concrete surface F, which is a workpiece, and the position is determined. Cut to a predetermined depth t.
Next, as shown in FIG. 4C, the position is sequentially changed by operating the arm cylinder 24a, the bucket cylinder 25a, and the like, and the chipping is performed while maintaining the predetermined depth t, and the chipping is completed.
Thus, by attaching the chiseling machine 10 to the excavator 20, manual operations using a chisel and a hammer that have been conventionally performed can be mechanized.
[0031]
5A and 5B are explanatory diagrams for explaining the operation on the wall surface. FIG. 5A is a side view showing the posture before entering the chip, FIG. 5B is a side view showing the start of the chip, and FIG. ) Is a side view showing a posture in which chipping is performed.
As shown in FIG. 5 (a), the chiseling machine 10 is moved closer to the mortar wall surface W of the structure, for example, the workpiece, by operating the arm cylinder 24a, the position is determined, and the rotary head 7 is rotated.
As shown in FIG. 5 (b), the mortar wall W is gradually cut with the cutting edge of the bit 9 by the extension of the bucket cylinder 25a, and the chipping operation is performed.
Next, as shown in FIG. 5C, the position is changed sequentially by the operation of the arm cylinder 24a, the bucket cylinder 25a, etc., and the chipping is performed while maintaining the predetermined depth t, and the chipping is completed.
[0032]
The present invention can be variously modified and changed within the scope of the technical idea, and the present invention naturally extends to the modified and changed invention. For example, a cushion is interposed between the top bracket 1 and the body frame 2 in the vertical direction, but the material of the cushion may be urethane rubber or other synthetic rubber in addition to nitrile rubber. Also. A mechanical object such as a spring or a damper may be used.
[0033]
【The invention's effect】
According to the first aspect of the present invention, there is provided a twin-head type chiseling machine having a simple twin head structure, reducing the weight with a single shaft, reducing the number of parts, and having high reliability. be able to. In addition, the twin head type chiseling machine is lighter and can be easily handled by an excavator. Further, the main body frame is connected to the top bracket at one end in the left-right direction at the top in a side view and is surrounded by the top bracket at the other end, and the vertical direction between the top bracket and the main body frame is Since the cushion is interposed in the gap, the vibration in the circumferential direction that occurs during the chipping operation can be absorbed by the cushion, so that the vibration that occurs during the chipping operation can be reduced. Further, the adverse effect on the excavator is reduced, the excavator failure is reduced, the vibration and noise transmitted to the operator operating the excavator are reduced, and the burden on the operator can be eliminated .
[0034]
According to the second aspect of the present invention, it is possible to provide a twin-head type chiseling machine capable of realizing a compact twin head by using a sealed turntable bearing as the bearing. And by making it with a seal | sticker, penetration | invasion of fine sand etc. can be prevented. Furthermore, the twin head type chiseling machine employing this turntable bearing has a sufficient rated load and can withstand cutting forces in the thrust direction and radial direction.
[0035]
According to invention of Claim 3, the rotational speed of two hydraulic motors can be made the same.
[0036]
According to the fourth aspect of the present invention, it is possible to prevent the occurrence of failure by double preventing sand and the like from entering.
[Brief description of the drawings]
FIG. 1 shows a full view of a twin-head type chipping machine according to the present invention, (a) is a perspective view thereof, (b) is a front view as viewed from the arrow C shown in (a), and (c) is (b) It is an enlarged side view of the arrow D shown in FIG.
FIG. 2 is a cross-sectional view taken along line AA shown in FIG.
FIG. 3 is a side view taken along arrow B shown in FIG.
FIGS. 4A and 4B are explanatory diagrams for explaining the operation with respect to the floor surface. FIG. 4A is a side view showing a posture before entering the chip, FIG. 4B is a side view showing the start of the chip, and FIG. FIG.
FIGS. 5A and 5B are explanatory diagrams for explaining the operation with respect to the wall surface, where FIG. 5A is a side view showing the posture before entering the chip, FIG. 5B is a side view showing the start of the chip, and FIG. FIG.
FIG. 6 is a perspective view showing an entire view of a conventional hydraulic excavator.
7 is a perspective view showing a state in which a hydraulic attachment is mounted on an arm 24 of a conventional hydraulic excavator 20. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Top bracket 1a, 1b Hole 2 Main body frame 2a Pin 2b Bolt 2c, 2d Cushion 2e, 2f Ring 3 Shaft 4 Hydraulic motor 5 Head guide 6 Bearing 6a Outer race 6b Inner race 6c Ball 7 Rotating head 7a Opening 7b Inner peripheral surface 7c Head 7d Rib 8 Bit holder 9 Bit 10 Twin head type chiseling machine
11 Head cover 12 Head bearing 13 Hydraulic manifold block 14 Hydraulic hose 20 Hydraulic excavator F Concrete surface W Mortar wall surface α Lead angle

Claims (4)

A twin-head type chiseling machine that is detachably attached to the arm tip of a hydraulic excavator and has two rotating heads,
A top bracket connected to the tip of the arm;
A main body frame connected to the top bracket and having a bearing outer race fixed to support the two rotary heads;
A shaft that is inserted into a through hole provided in the main body frame and transmits a rotational force;
A hydraulic motor connected to the left and right ends of the shaft and transmitting a rotational force to the output shaft;
A head guide connected to the output shaft of the hydraulic motor, to which an inner race of the bearing is fixed, and rotatably supported by the bearing;
Bit holders that are fixed to the head guide and into which bits to be cutting blades are inserted are spirally arranged and joined, and rotary heads arranged on the left and right respectively,
Wherein is inserted into the bit holder of the rotary head, e Bei a plurality of bits chipping the upper surface of the workpiece, and
The main body frame is connected to the top bracket at one end in the left-right direction at the top in a side view and is surrounded by the top bracket at the other end, and a vertical gap between the top bracket and the main body frame. A twin-head type chiseling machine, characterized in that it is connected via a cushion.   The bearing is a turntable bearing with a seal, and a plurality of bolt through holes are provided in the outer race and the inner race, the outer race is fixed to the main body frame by bolts, and the inner race is integrated with the rotary head. The twin-head type chiseling machine according to claim 1, wherein the twin-head type chiseling machine is fixed to the head guide by a bolt.   The twin-head type chipping machine according to claim 1, wherein the two hydraulic motors are connected to both ends of a shaft disposed in the center of the main body frame. The head of the rotary head is formed in a drum shape, and the inner peripheral surface of the head is provided with O-rings in close contact with the inner peripheral surface of the head through rings on both side surfaces of the main body frame, and MC nylon 2. The twin head type chipping machine according to claim 1, further comprising a head bearing formed of (registered trademark) .

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