JPH1157507A - Concrete crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give stronger crushing force to a concrete crusher operated by an attachment actuating cylinder of a hydraulic shovel body. SOLUTION: A hinge pin P3 fitted to a fixed crushing member 2 for supporting a moving crushing member 3 rotated by an attachment actuating cylinder 13 is positioned below an arm pin center passing line L1 passing through the center of the diameter of an attachment connecting pin P2 at the tip of an arm 12 and the center of the diameter of an arm foot pin, and a link connecting pin P4 installed projectingly on the rear of the moving crushing member 3 and to which a working link 14 is connected is positioned above the arm pin center passing line L1 . Then, crushing force corresponding to moment F×L obtained from a product of between-pins distance L from the center of the diameter of the hinge pin P3 to the center of the diameter of the link connecting pin P4 and component force F in the direction perpendicular to the moving crushing part pin center passing line L2 passing through the centers of the diameters of these pins can be given to the moving crushing member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete crusher mounted on the tip of an arm of a hydraulic shovel body, and more particularly to a concrete crusher capable of crushing a concrete block with a stronger crushing force. Belongs to the technical field.

[0002]

2. Description of the Related Art As is well known, when a concrete building such as an old building is renewed, it is dismantled and a new concrete building is constructed. When processing such concrete blocks, they are divided into small pieces so that they are smaller than the specified size.However, recently, large-scale construction sites have used mobile crushers equipped with jaw crushers, impact crushers, etc. on traveling vehicles. Have been. However, such mobile crushers are expensive and may not pay depending on the size of the construction site. In this case, for example, a well-known nibble is provided with crushing teeth, thereby crushing the concrete lump and sorting the crushed product by a sieve bucket. Then, the concrete block is crushed by a repetitive operation of further crushing the large block on the sieve.

However, when using a nibbler,
Hydraulic oil must be supplied to and discharged from the nibble operating cylinder that operates the nibbler. In other words, it is necessary to increase the hydraulic piping, which increases the cost. In addition, it is difficult to operate the pedal because of the pedal operation.
There was a problem that the concrete crushing efficiency was poor. The slow opening / closing speed of the nibble is necessary, for example, because it is necessary to cut a reinforcing bar or steel frame.In order to exert a stronger crushing force with a limited power source, use a high-pressure, low-discharge hydraulic pump. It is caused by that. Of course, when a hydraulic pump that operates the hydraulic excavator body is used as it is, a nibble operating cylinder having a large cylinder diameter is employed.

[0004] Therefore, in order to crush concrete blocks at a higher speed, it has been considered to utilize an attachment operation cylinder originally attached to the arm of the hydraulic excavator body. That is, the crushing of the concrete block does not require a strong crushing force unlike a nibbler. This makes it unnecessary to increase the number of hydraulic pipes, thereby avoiding an increase in cost. In addition, since the lever operation is sufficient, the operation becomes easy, and the crushing efficiency of the concrete block can be improved. As a device utilizing the attachment operation cylinder, a concrete crusher having a configuration described below is known, for example.

The concrete crusher according to the prior art will be described below with reference to FIG. 3 which is an explanatory view of a side view of the concrete crusher. Reference numeral 51 shown in the figure is attached to the tip of an arm 61 of a hydraulic excavator body (not shown). This is a concrete crusher having the following configuration. The concrete crusher 51 has a fixed crushing member having crushing teeth 52a through attachment connection pins P ₁ and P ₂ in an attachment connection pin hole at the tip of the arm 61 and a pin hole of a bracket at the front end of the arm 61, respectively. 52 are attached. Tooth height center line passing through the center of the tooth height of the crushing teeth 52a of the fixed crushing member 52, passes through the diameter central arm foot pin for coupling to the boom not shown the arms 61 and center diametric attachment connecting pin P ₁ It is configured to match the extension of the arm pin center passage line. Further, the crushing teeth 52 of the fixed crushing member 52 are moved by the attachment connecting pin P ₁ at the tip of the arm 61.
movable crushing member 5 having crushing teeth 53a on the side opposite to
3 is rotatably connected to the movable crushing member 5.
On the rear side of the connecting bracket ₃ , an operating link 62 for rotating the connecting bracket 3 is connected via a link connecting pin P3.
4 are protruded. Therefore, according to the concrete crusher 51 according to this conventional example, the operation link 6 is operated by the expansion and contraction of the rod 63a of the attachment operation cylinder 63.
The movable crushing member 53 is rotated via 2 and the crushing teeth 52a, 53a of the fixed crushing member 52 and the movable crushing member 53 mesh with each other, so that the concrete lumps are crushed by the meshing crushing teeth 52a, 53a.

[0006]

According to the concrete crusher according to the prior art, it is not necessary to increase the number of hydraulic pipes, thereby avoiding an increase in cost. It is considered to be useful as it is possible to improve the crushing efficiency. However, the concrete crusher according to this conventional example has the following problems to be solved, that is, although it does not require a very strong crushing force to crush concrete lumps, due to its structure, it has a fixed crushing member and a movable crushing member. There is a problem to be solved that the crushing force becomes weaker as the degree of opening with the member becomes narrower, and the crushing ability of the concrete block is not always sufficient.

[0007] Accordingly, it is an object of the present invention to provide a concrete crusher capable of crushing a concrete block with a stronger crushing force.

[0008]

Means for Solving the Problems To solve the above problems, the concrete crusher according to the present invention is characterized in that the concrete crusher is mounted on the tip of a rotatable arm of a hydraulic excavator body. In a concrete crusher, which is opened and closed via an operation link pushed and pulled by expansion and contraction of a rod of an attachment operation cylinder having one end pivotally attached to an arm to crush a concrete mass,
A fixed crushing member attached to a tip of the arm, and an arm pin center of the fixed crushing member passing through a diameter center of an attachment connecting pin at an end of the arm and a diameter center of an arm foot pin connecting the arm to a boom. A movable crushing member that is rotated around a hinge pin provided at a position below the passing line, and protrudes from the back side of the movable crushing member, and in a state where the fixed crushing member and the movable crushing member are closed, A movable crushing member operating arm is arranged such that a position of a pin hole into which a link connecting pin to which an operating link is connected is inserted above the arm pin center passage line.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete crusher according to an embodiment of the present invention will be described with reference to FIG. 1 showing a side view of a hydraulic shovel body equipped with a concrete crusher and FIG. 2 showing a side view explanatory diagram of the concrete crusher. I will explain while.

Reference numeral 10 shown in FIG. 1 denotes a hydraulic shovel body having a well-known configuration.
Arm foot pin P _{1 at} the tip of the boom 11
At the tip of an arm 12 rotatably connected via an arm 12, a rod of an attachment operating cylinder 13 whose bottom side is pivotally attached to a cylinder mounting bracket 12 a projecting from the back of the arm 12 is expanded and contracted. The concrete block C is opened and closed by the operation link 14 pushed and pulled.
_A concrete crusher 1 for crushing _m , which will be described later, is mounted. Note that one end is connected to the arm 12 via a pin, the other end is connected to the distal end of the rod 13a of the attachment operation cylinder 13 via the pin, and the base end of the operation link 14 is connected. , A well-known idler link 15.

As shown in FIG. 2, the concrete crusher 1 is pushed and pulled by the fixed crushing member 2 attached to the tip of the arm 12 by mechanical fastening means and the expansion and contraction of the rod 13a of the attachment operation cylinder 13. The movable crushing member 3 is rotated by the operation link 14 with the hinge pin P ₃ as a fulcrum, and crushes the concrete block by pressing it against the fixed crushing member 2.

More specifically, the concrete crusher 1
The fixed crushing member 2 has an attachment connecting pin P ₂ inserted into an attachment connecting pin hole at the tip of the arm 12.
And a bracket 1 provided on the side of the tip of the arm 12
2b and a bolt B passed through a bracket 2b provided on the side surface of the frame portion of the fixed crushing member 2, and is attached to the distal end portion of the arm 12. And
The crushing portion 2a of the concrete block of the fixed crushing member 2
Arm pin center passage line, which is a center line passing through the center of the diameter of the attachment connecting pin P ₂ at the tip of the arm 12 and the center of the diameter of the arm foot pin P ₁ (see FIG. 1) connecting the arm 12 to the boom 11. It is set to be in a lower position than L _1.

[0013] The movable crushing member 3 is a lower position than the center of the pin passline for the arm of the attachment connecting pin P ₂ side of the crushing part 2a of the fixed crushing member 2,
And this attachment connecting pin P _2, which is pivotally connected by a hinge pin P ₃ formed by fitted to the connecting pin hole provided at a position between the crushing part 2a of crushing fixed member 2 and the A plurality of detachable crushing teeth 3a are provided on a side of the movable crushing member 3 opposite to the crushing portion 2a of the fixed crushing member 2.

On the opposite side of the crushing teeth 3a of the movable crushing member 3, that is, on the back side of the movable crushing member 3, when the fixed crushing member 2 and the movable crushing member 3 are closed, the above-described operation is performed. position of the pin hole link connecting pin P ₄ which link 14 is coupled is fitted is movable crushing member actuating arm 4 height becomes a position above the arm pin center passline L ₁ is projected I have. Although the movable crushing member operating arm 4 is inclined toward the tip of the arm 12,
This inclination is set in consideration of the direction of the force acting on the movable crushing member operation arm 4.

Furthermore, from the back end of the crushing teeth 3a of the crushing part 2a or the movable crushing member 3 of the crushing fixed member 2 it is between the hinge pin P _3, and the side surface of the crushing fixed member 2 and the movable crushing member 3 The operator cab C of the excavator body 10 (FIG. 1)
See), a rebar cutting cutter 5 for cutting the rebar existing in the concrete mass.
Is installed. Therefore, the driver or the like can cut the rebar while looking at the rebar cutting cutter 5,
The concrete mass can be crushed while effectively cutting the rebar.

By the way, in the embodiment of the present invention, as described above, the crushing teeth are provided only on the movable crushing member 3 and not provided on the fixed crushing member 2. The reason is that the concrete block is crushed from one side. Therefore, similarly to the conventional example, the fixed crushing member 2 is also provided with crushing teeth so that the concrete block is crushed from two sides. You can also.

The operation of the concrete crusher 1 having the above structure will be described below.
Is moved to a predetermined place where the concrete mass to be crushed is deposited and stopped, and the boom 11 is raised and lowered,
The movable crushing member 3 is opened by the rotation operation of the arm and the reduction of the rod 13 a of the attachment operation cylinder 13, and the concrete crush member is sandwiched between the fixed crushing member 2 and the movable crushing member 3. When the rod 13a of the attachment operating cylinder 13 is extended to rotate the movable crushing member 3 in the direction of the fixed crushing member 2, the concrete mass is pinched between the fixed crushing member 2 and the movable crushing member 3. Crushed, and the reinforcing steel present in the concrete mass is cut.

In the above-mentioned concrete crusher 1 crushing operation of the concrete crusher, the movable crushing member 3 moves the movable crushing member operating arm 4 from the center of the diameter of the hinge pin P ₃ which rotatably supports the movable crushing member 3. Link connecting pin P ₄ to which the operating link 14 at the tip of
Of the pin between the distance L to the center diametric, in the direction of the operating link 14 perpendicular to the movable crushing member pin center passline L ₂ passing through the center of the radial diameter central link connecting pin P ₄ of the hinge pin P ₃ Moment M of magnitude multiplied by the component force F of the pressing force
(= F × L) is pressed against the fixed crushing member 2 and a strong crushing force is obtained even when the fixed crushing member 2 and the movable crushing member 3 are in a closed state.

Therefore, according to the concrete crusher 1 according to the embodiment of the present invention, due to its structure, the crushing force becomes weaker as the degree of opening between the fixed crushing member and the movable crushing member becomes narrower. In addition, the concrete mass can be crushed at a high efficiency by a stronger crushing force, and the rebar can be cut while looking at the rebar cutting cutter 5 during the crushing of the concrete mass. Work efficiency can be improved.

In the above description, the case where the rebar cutting cutter is provided has been described as an example. However, even if the rebar cutting cutter is not provided, it is possible to crush concrete blocks with higher efficiency than before. it can. Also, the case where the concrete crusher 1 according to the embodiment of the present invention is mounted on the tip of the arm of the crawler traveling type hydraulic excavator body has been described as an example. Since it can be mounted, the scope of application of the technical idea of the present invention is not limited by the above embodiment.

[0021]

As described above, according to the concrete crusher according to the conventional example, the crushing force decreases as the opening degree between the fixed crushing member and the movable crushing member decreases, and the crushing ability of the concrete block is not always sufficient. Did not. However, according to the concrete crusher according to the present invention, the movable crushing member can move through the diameter center of the hinge pin and the diameter center of the link connection pin at a distance between the pins from the diameter center of the hinge pin to the diameter center of the link connection pin. The movable crushing member can be pressed against the fixed crushing member with a force corresponding to the moment corresponding to the magnitude of the component of the pressing force of the operating link in the direction orthogonal to the crushing member pin center passage line. Since the crushing force can be obtained, it is possible to contribute to a great improvement in the efficiency of the crushing process of the concrete block.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator body equipped with a concrete crusher according to an embodiment of the present invention.

FIG. 2 is an explanatory side view of a concrete crusher according to an embodiment of the present invention.

FIG. 3 is an explanatory side view of a concrete crusher according to a conventional example.

[Explanation of symbols]

1: concrete crusher, 2: fixed crushing member, 2a
... Crushing part, 3 ... Movable crushing member, 3a ... Crushing teeth, 4 ... Movable crushing member operating arm, 5 ... Rebar cutting cutter 10 ... Hydraulic excavator body, 11 ... Boom, 12 ... Arm, 13 ... Attachment operating cylinder, 14 ... working link, 15 ... idler link C ... operator's cab C _m ... concrete lump L ... pin distance L ₁ ... arm pin center passing line, L ₂ ... movable crushing member pin center passing line P ₁ ... arm foot pin, P ₂ … Attachment connecting pin, P ₃ … Hinge pin, P ₄ … Link connecting pin

Claims (1)

[Claims] 1. A hydraulic excavator, which is mounted on a tip end of a rotatable arm and is opened and closed via an operation link pushed and pulled by extension and contraction of a rod of an attachment operation cylinder having one end pivotally attached to the arm. A fixed crushing member attached to the tip of the arm, an arm foot pin for connecting the arm to a boom and a radial center of an attachment connecting pin at an end of the arm of the fixed crushing member. A movable crushing member which is pivotally supported by a hinge pin provided at a position lower than an arm pin center passage line passing through the center of diameter of the arm, and a movable crushing member protrudingly provided on the rear side of the movable crushing member and movable with the fixed crushing member. When the crushing member is closed, the position of the pin hole into which the link connecting pin for connecting the operation link is inserted is set to the arc. A movable crushing member operating arm positioned above a center pin passing through the center of the concrete crusher.