JPH10259670A - Crushing machine with hammering means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase crushing force by fitting one and/or the other of a pair of opposite crushing teeth to a crushing machine main body via a hammering means. SOLUTION: An operation lever of a crushing cylinder operation valve of a hydraulic control device 40 is operated to expand or shrink a crushing cylinder 18, and a demolition object is pinched between fixed crushing teeth 6 and moving crushing teeth 8. The operation lever is operated to feed pilot oil to a hydraulic selector valve through an oil path. When pressure oil is fed to an oil path 42a, the crushing cylinder 18 is extended to apply crushing force to the demolition object. When an electric switch is operated, a hydraulic breaker operation pilot valve 48 is switched, a branch selector valve is switched by the pilot oil, and the pressure oil of the oil path 42a is branched and fed to a hydraulic breaker 20 through an oil path 44a to operate the hydraulic breaker 20. Static crushing force and dynamic crushing force are applied to the demolition object, and the crushing force can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher mounted on a working machine of a hydraulic shovel and used for demolition work, and more particularly to a crusher provided with a hitting means.

[0002]

2. Description of the Related Art For dismantling various structures such as buildings, houses and concrete structures, for example, a crusher mounted on a working machine of a hydraulic shovel is used. This kind of crusher,
For example, it is disclosed in Japanese Utility Model Publication No. 3-27172.
The crusher includes a crusher main body and a movable arm that is rotatably mounted on the crusher main body and is rotated by a crushing cylinder. The dismantled material is sandwiched between a pair of opposing crushing teeth provided on each of the crusher main body and the movable arm, and is crushed by the force of the crushing cylinder (crushing force). There are a wide variety of types of demolition, such as concrete, reinforced concrete, rock, asphalt, and wood. In addition, with the use of high-strength concrete in recent years, a crusher has been required to have a larger crushing force. To increase the crushing force, increase the hydraulic pressure of the crushing cylinder (increase the hydraulic relief pressure), increase the size of the crushing cylinder (adopt a large-diameter cylinder), and change the mounting position between the movable arm and the crushing cylinder. Measures such as increasing the crushing force have been taken.

[0003]

However, the conventional crusher has the following problems to be solved.
In other words, the means for increasing the crushing force described above are limited by the size of the crusher, the maximum pressure in terms of the performance of the hydraulic equipment and the pressure resistance, and the like, and cannot significantly increase the crushing force. Was.

[0004] The present invention has been made in view of the above-mentioned facts, and a technical problem thereof is to provide a crusher in which the crushing force is significantly increased as compared with a conventional crusher.

[0005]

According to the present invention, in order to solve the above technical problems, the crushed teeth are configured to be mounted via striking means.

That is, according to the present invention, as a crusher provided with a hitting means for solving the above technical problem, a crusher main body on which one of a pair of opposing crushing teeth is mounted, and a crusher rotating to the crusher main body. A movable arm body movably supported and having the other of the pair of crushing teeth mounted thereon, and a crusher rotatably supported at one end by the crusher body and at the other end by the movable arm. A crusher, wherein the one and the other of the pair of crushing teeth are moved in a direction to approach or separate from each other by extending or contracting the crushing cylinder. A crusher provided with a striking means, wherein the one and / or the other of the crushing teeth is mounted via a striking means.

[0007] The hitting means is advantageously a hydraulic breaker. Further, it is convenient to branch and supply pressurizing oil for extending the crushing cylinder to the striking means.

[0008] In the crusher provided with the striking means according to the present invention, the crushing teeth are mounted via the striking means. Therefore, since a striking force is further applied by the striking means in addition to the crushing force of the conventional crushing cylinder, a greater crushing force can be obtained.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a crusher having a percussion means constructed in accordance with the present invention.

Referring to FIG. 1, an outline of a crushing machine generally designated by reference numeral 2 will be described first. The crushing machine 2 includes a crushing machine main body 4 having a fixed crushing tooth 6 which is one of a pair of crushing teeth, and a crushing machine. A movable arm body 12 rotatably supported by the machine body 4 via a shaft member 10 and having a movable crushing tooth 8 as the other of the pair of crushing teeth mounted thereon, and one end connected to the other end of the crushing machine body 4. The crushing cylinder 18 is rotatably supported by the shaft member 14 and the shaft member 16 on the movable arm body 12, respectively. When the crushing cylinder 18 is extended or contracted, the fixed crushing teeth 6 and the movable crushing teeth 8 are moved in a direction of approaching or away from each other. The movable crushing teeth 8 are mounted on the movable arm body 12 via the striking means 20. The crusher 2 is mounted on, for example, a working machine 50 of a hydraulic shovel and operated by a hydraulic control device 40.

The crusher main body 4 is of a known form per se, and is integrally formed of various steel members. On one end side (upper side in the figure), a shaft hole for inserting the shaft members 52a and 52b for mounting on the work machine 50 is provided. On the other end side (the lower side in the figure), fixed crushing teeth 6 made of cemented carbide special alloy steel having wear resistance and high toughness are mounted by welding or appropriate fastening means. A shaft hole for inserting the shaft member 14 for mounting one end of the crushing cylinder 18 and a shaft hole for inserting the shaft member 10 for mounting the movable arm 12 are formed at the center in the vertical direction.

The movable arm 12 may be basically of a known type in itself, and is formed of various steel members. The movable crushing teeth 8 are connected to a chisel 20a, which is an output shaft of the striking means 20, and are slidably mounted on the movable arm 12 (the striking means 20 will be described later in detail). One end side (upper side in the figure)
A shaft hole of the shaft member 10 for rotatably mounting the movable arm body 12 on the crusher main body 4 and a crushing cylinder 18
A shaft hole of the shaft member 16 for rotatably mounting the other end of the shaft member is formed. On the other end side (the lower side in the figure)
The movable crushing teeth 8 are arranged on the crusher main body 4 at positions facing the fixed crushing teeth 6. The movable crushing teeth 8 are fixed crushing teeth 6
It is made of cemented carbide special alloy steel having the same abrasion resistance and high toughness. The movable arm body 12 has a concave portion 12a for slidably receiving the movable crushing teeth 8 and a shaft hole of a shaft member 12b to which one end of the striking means 20 is rotatably mounted. The striking means 20 has one end portion thereof connected to the shaft member 12b.
The movable crushing teeth 8 rotatably supported by the movable arm body 12 and connected to the chisel 20a, which is the output shaft at the other end of the hitting means 20, are slidably inserted into the recess 12a.

The crushing cylinder 18 is a known double-acting hydraulic cylinder that expands and contracts by hydraulic pressure. The head end of the cylinder body is connected to the crusher body 4 via the shaft member 14, and the cylinder rod end is connected to the movable arm body 12. Each is rotatably mounted via a member 16. The operation of the crushing cylinder 18 is controlled by a hydraulic control device 40 (the hydraulic control device 40 will be described later in detail).

Continuing with FIG. 1 and FIG. 2, the striking means 20 is interposed between the movable arm 12 and the movable crushing teeth 8 to apply a striking force to the movable crushing teeth 8. In this embodiment, a hydraulic breaker, which is a typical hitting means, is employed. The hydraulic breaker 20 itself is a known one, and has a control piston 2 therein.
0b, a striking piston 20c, and a piston gas chamber 20d.
0c reciprocates in the axial direction and strikes the chisel 20a as the output shaft.

The hydraulic control device 40 will be described with reference to FIGS. 1 and 2. The hydraulic control device 40 switches hydraulic pressure from a hydraulic pressure source 41a to the crushing cylinder 18 to hydraulically switch the crushing cylinder 18 to expand and contract. The valve 42 and the crushing cylinder 1
And a branch switching valve 44 that branches off an oil passage 42a that supplies pressure oil that causes the hydraulic fluid breaker 8 to extend. The hydraulic switching valve 42 is a pilot-operated three-position valve operated by pilot oil. In a state where the hydraulic switching valve 42 to which the pilot oil is not supplied and the hydraulic switching valve 42 is not operated and is held in a neutral state (the state shown in the drawing), the pressure oil from the hydraulic pressure source 41a is returned to the tank 41c. Branch switching valve 44
Is a pilot operated two position valve operated by pilot oil. The branch switching valve 44 is mounted at a position near the crusher 2 at the distal end of the arm 52 of the work machine 50.
When the pilot oil is not supplied, the branch switching valve 44
The connection of the oil passage 44a to the hydraulic breaker 20 connected to 2a is closed. The hydraulic control device 40 further selectively supplies pilot oil to the hydraulic switching valve 42 to
Cylinder Operation Pilot Valve 46 for Switching Operation
And a hydraulic breaker operating pilot valve 48 for selectively supplying pilot oil to the branch switching valve 44 to switch the branch switching valve 44. The crushing cylinder operation pilot valve 46 is a three-position valve provided in an operation driver's seat (not shown). The crushing cylinder operation pilot valve 46 is operated by moving the knob 46b of the operation lever 46a to a three-position including a neutral holding position. The pilot pressure oil from the source 41b is selectively switched and supplied to the hydraulic switching valve 42, and the hydraulic switching valve 42 is switched. The hydraulic breaker operating pilot valve 48 is a two-position solenoid valve which is disposed near the driver's seat or at an appropriate position, and intermittently switches a normally open electric switch 46c provided on a knob 46b of an operating lever 46a of the driver's seat. By operation, the pressure oil from the pilot hydraulic pressure source 41b is selectively switched by an electric signal and supplied to the branch switching valve 44, and the branch switching valve 44 is switched.

The hydraulic control device 40 further includes a hydraulic switching valve 4
Oil passage 42a and oil passage 42 connecting hydraulic cylinder 2 and crushing cylinder 18
A pilot check valve 60 is provided near the crushing cylinder 18 in FIG. In the pilot check valve 60, a check valve operated by pilot pressure oil is incorporated so as to be interposed in the middle of the oil passage 42a. When the pilot pressure oil does not act, crushing from the hydraulic switching valve 42 through the oil passage 42a is performed. The flow of pressurized oil to the head side of the cylinder 18 is allowed, and the flow from the head side of the crushing cylinder 18 to the hydraulic switching valve 42 in the opposite direction is blocked. The pilot check valve 60 has an oil passage 4 on the rod side of the crushing cylinder 18.
2b is provided with a pilot oil passage 60a. When pressure oil is generated in the rod-side oil passage 42b, the pressure oil in the oil passage 42b passes through the pilot oil passage 60a and acts as pilot pressure oil on the check valve. Then, the check valve is opened to allow the flow from the head side of the crushing cylinder 18 to the hydraulic switching valve 42.

Referring to FIG. 1, the attachment of the crusher 2 configured as described above to, for example, a working machine 50 of a hydraulic shovel will be described. In FIG. 1, the tip of the working machine 50 is shown. I have. An arm 52 serving as a working arm, a link member 54 having one end rotatably attached to the arm 52, and one end rotatably attached to the arm 52 are provided at the distal end of the working machine 50 (shown in the figure). The other end is pivotally attached to the other end of the link member 54 and the work machine cylinder 56 is rotatably mounted on the other end, and the one end is pivoted to the joint between the other end of the link member 54 and the work machine cylinder 56. And a link member 58 connected freely. The crusher main body 4 of the crusher 2 is rotatably attached to the other end of the link member 58 and the tip of the arm 52 via shaft members 52a and 52b, respectively.

Referring to FIGS. 1 and 2, the operation of the crusher 2 equipped with the impact device constructed according to the present invention will be described. (1) The arm 52 is moved by an arm swing cylinder (not shown). By moving the work machine cylinder 56, the crusher main body 2 is positioned at an appropriate work position. (2) Crushing Cylinder Operation The operating lever 46a of the pilot valve 46 is operated to expand and contract the crushing cylinder 18, and the dismantled material is sandwiched between the fixed crushing teeth 6 and the movable crushing teeth 8. By operating the lever 46a in a predetermined direction, for example, in the direction of arrow 46d, the pilot oil flows through the oil passage 46e and is supplied to the hydraulic switching valve 42 so that the hydraulic oil from the hydraulic source 41a is supplied from the hydraulic switching valve 42 to the oil passage 42a.
, The crushing cylinder 18 expands. By maintaining this state, the crushing force of the crushing cylinder is continuously applied to the dismantled object. (3) In this state, when the electric switch 46c provided on the knob 46b of the operation lever 46a is operated in the connection state, the hydraulic breaker operation pilot valve 48 is energized, and the hydraulic breaker operation pilot valve 48 is switched. The branch switching valve 44 is switched by the pilot oil from the hydraulic circuit breaker 20, and the oil passage 42a
Is branched and supplied through the oil passage 44a to operate the hydraulic breaker 20. The operation of the hydraulic breaker 20 will not be described because the hydraulic breaker 20 itself is known. As described above, the hydraulic breaker 20 is operated in the state of the extension operation of the crushing cylinder 18. (4) The pilot check valve 60 provided in the oil passage 42a and the oil passage 42b connecting the hydraulic switching valve 42 and the crushing cylinder 18 has the crushing force of the crushing cylinder 18 even when the operating pressure of the hydraulic breaker 20 is low. Work to hold.
That is, when the hydraulic breaker 20 is operated while the crushing force of the crushing cylinder is continuously applied to the dismantled material, the hydraulic breaker 2
Since the operating pressure of 0 is lower than the operating oil pressure of the crushing cylinder 18, the operating pressure of the crushing cylinder 18 is reduced to the operating pressure of the hydraulic breaker 20 without the check valve. By providing the check valve, backflow of the pressurized oil from the head side of the crushing cylinder 18 to the hydraulic breaker 20 side is prevented, and the crushing force is maintained. When the crushing cylinder 18 is contracted, the crushing cylinder 18
The hydraulic oil acting on the rod side of the cylinder operates the pilot check valve 60 to open the check valve, the head side of the crushing cylinder 18 is connected to the hydraulic switching valve 42, the oil flows to the tank 41c, and the crushing cylinder 18 contracts. (5) In addition to the static crushing force of the crushing cylinder 18, the dynamic impact force of the hydraulic breaker 20 acts on the dismantled product sandwiched between the fixed crushing teeth 6 and the movable crushing teeth 8, The dismantled product is crushed by a large crushing force in which the two are united. (6) If only the crushing force of the crushing cylinder 18 is sufficient for the crushing force and it is not necessary to operate the hydraulic breaker 20, the electric breaker 20 must be operated (unless connected) unless the electric switch 46c is operated. Does not work. (7) In the present embodiment, since the hydraulic breaker 20 is employed as the striking means, the same hydraulic power source as the crushing cylinder 18, the working machine cylinder 56, and the like can be used, and it is not necessary to newly add a power source. The crusher 2 provided with a hitting means is provided with a minimum configuration.

FIG. 3 shows a hydraulic control device 45 as another embodiment of the hydraulic control device 40. In this hydraulic control device 45, the operation of the hydraulic breaker 20 is performed in accordance with FIG.
A branch switching valve 44 in the hydraulic control device 40 shown in FIG.
The automatic branch switching valve 64 is used instead of the combination of the breaker operation pilot valve 48 and the electric switch 46c. Since the other configuration and operation are substantially the same as those of the hydraulic control device 40, the automatic branch switching valve 64 will be described. Oil passage 42a connecting the head side
Is provided in an oil passage to the branched hydraulic breaker 20. The automatic branch switching valve 64 is a pilot-operated two-position valve operated by pilot oil that is substantially the same as the branch switching valve 44, and closes the oil passage when a prescribed pilot oil pressure is not applied. The automatic branch switching valve 64 is provided with a pilot oil passage 64a for guiding pressure oil upstream of the automatic branch switching valve 64 as pilot operating oil.
An orifice 64b is provided in the pilot oil passage 64a. In this configuration, when the pressure oil supplied to the head side of the crushing cylinder 18 becomes equal to or higher than the set pressure, the pressure is changed to the automatic branch switching valve 64 via the pilot oil passage 64a.
And switches the automatic branch switching valve 64 to supply the pressure oil to the oil passage 44.
a to the hydraulic breaker 20 to supply the hydraulic breaker 2
Activate 0. The orifice 64b provided in the pilot oil passage 64a stabilizes the switching operation of the automatic branch switching valve 64. In this embodiment, when the crushing force (oil pressure) exceeds a set value while the crushing cylinder 18 applies the crushing force to the dismantled material, the hydraulic breaker 20 automatically operates. When the dismantled material is crushed with a set crushing force or less, the hydraulic breaker 20 does not operate. Thus, a hydraulic control device 45 that is easy to operate is provided.

As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be variously modified or modified within the scope of the present invention. It is. For example, (1) Although a hydraulic breaker is used as a hitting means, if a hitting force is generated, for example, a pneumatic breaker,
An electric vibrator or the like can be used. (2) The striking means in the present embodiment is mounted between the movable crushing teeth and the movable arm, but between the fixed crushing teeth and the crusher main body, or between the movable crushing teeth and the movable arm. It may be mounted both on the body and between the fixed crushing teeth and the crusher body. (3) Further, a striking means is interposed between the crushing cylinder and the crushing machine main body or between the crushing cylinder and the movable arm, so that the crushing force of the crushing cylinder and the striking force of the striking means are applied to the entire movable arm. It is also possible to work. (4) In the present embodiment, the intermittent switching of the hydraulic oil in the hydraulic oil supply oil passage 42a to the hydraulic breaker 20 is performed in three stages of the branch switching valve 44, the breaker operation pilot valve 48, and the electric switch 46c, or automatically. Although the operation is performed by the switching valve 64, the branch switching valve 44 or the automatic branch switching valve 64 is used.
May be replaced with an electromagnetic switching valve instead of a pilot operated switching valve, and can be directly operated by the electric switch 46c.

[0021]

According to the crusher provided with the hitting means constituted in accordance with the present invention, by using the hitting force of the hitting means in addition to the conventional crushing force of the crushing cylinder,
Large crushing force can be obtained without using excessive oil pressure.

[Brief description of the drawings]

FIG. 1 is a side view of a crusher provided with a hitting means configured according to the present invention.

FIG. 2 is a schematic diagram showing a circuit of a hydraulic control device of a crusher having a striking means configured according to the present invention.

FIG. 3 is a schematic diagram showing a circuit of another hydraulic control device configured according to the present invention.

[Explanation of symbols]

 2: crusher 4: crusher body 6: fixed crushing tooth (one of a pair of crushing teeth) 8: movable crushing tooth (the other of a pair of crushing teeth) 12: movable arm 18: crushing cylinder 20: hydraulic breaker (strike) Means) 40, 45: Hydraulic control device 42: Hydraulic switching valve 44: Branch switching valve 46: Crushing cylinder operating pilot valve 48: Hydraulic breaker operating pilot valve 50: Work equipment 60: Pilot check valve 64: Automatic branch switching valve

Claims (3)

[Claims] 1. A crusher main body having one of a pair of opposing crushing teeth mounted thereon, and a movable arm body rotatably supported by the crusher main body and having the other of the pair of crushing teeth mounted thereon. A crushing cylinder, one end of which is rotatably supported by the crusher body and the other end of which is rotatably supported by the movable arm body. In a crusher in which the one and the other of the teeth are moved in a direction in which they approach or separate from each other, the one and / or the other of the pair of crushed teeth is mounted via a striking means. A crusher provided with a striking means. 2. A crusher equipped with a striking means according to claim 1, wherein said striking means is a hydraulic breaker. 3. A pressure oil for expanding the crushing cylinder is supplied to the striking means in a branched manner.
Or a crusher provided with the hitting means according to 2.