JPH0345547Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a mower for a shovel-type excavator, and more particularly to a mower that can be attached to the end of the arm of a hydraulic shovel-type excavator to easily cut grass on a slope.

[Background of the idea]

For example, an embankment has a sloped surface and a flat surface. Grass mowing on a flat surface can be efficiently carried out using a self-propelled mower, but when such a machine is used for mowing a slope, the following problems arise. That is, the inclination angle of the slope is relatively steep, and there is always a risk of overturning when using a self-propelled mower. For this reason, mowing work on slopes is generally carried out using a backpack-type power mower. This mowing work is hard work, cutting grass that is as tall as one's height under the scorching summer sun, and the cut stems of the grass are sharp and get in the way, making it difficult for the worker to move.
Work efficiency is also poor. Furthermore, if the inclination angle of the slope is large, the worker cannot stand and mowing the grass is difficult. Furthermore, the mowing work on the embankments and the like described above is not carried out all year round, but is carried out mainly in the summer, so even if a dedicated machine is purchased, the operation rate is low and it is not profitable. Therefore, there has been a strong need for a general-purpose lawn mower that can be equipped with a lawn mowing attachment. The inventor of the present invention focused on mowing work by attaching a mowing attachment to a hydraulic shovel-type excavator used in general civil engineering work. When used as an attachment for shovel-type excavators, the following conditions are necessary: Firstly, it must be able to rotate at least around 1,800 to 2,000 revolutions per minute.Secondly, it can also be used for general civil engineering work, etc. Because it is used, it must be easy to attach and detach from the excavator.

[Prior art and its issues]

By the way, Utility Model Application No. 58-176617 and Utility Model Application No. 176617
Publication No. 170918 discloses a grass cutter that is attached to a hydraulic shovel type excavator to perform grass cutting work. The grass mowers disclosed in the above publications both have a cutting blade driven by a hydraulic motor that utilizes the hydraulic pump used in excavators, and are attached to the end of the arm of a hydraulic excavator to perform grass cutting operations. However, with this machine, the number of rotations of the cutting blade is insufficient, making it virtually impossible to cut grass. This point will be explained in more detail. As is well known, hydraulic shovel type excavators operate the boom and arm with a hydraulic cylinder, and excavate earth and sand with a bucket attached to the end of the arm, so the hydraulic pump must also be suitable for the work, that is. The type that generates a large amount of torque rather than a high flow rate, making it easier to perform excavation work, is used. As explained above, when mowing grass with a cutting blade, a rotation speed of at least 1,800 to 2,000 revolutions per minute is required. Due to the characteristics of this method, the oil flow rate is insufficient and the rotational speed of the cutting blade is insufficient, so there is a fundamental problem that it is impossible to perform sufficient grass cutting work, and it is impossible to put it into practical use. Even if the above rotational speed cannot be obtained, the rotational speed of the hydraulic motor will increase if the rotational speed of the engine that operates the hydraulic pump is increased. However, when moving the excavator or moving the arm with the engine speed increased, there is a risk of sudden start or sudden operation, making it difficult to operate each operating part. In addition, hydraulic motors are equipped with a safety device that releases hydraulic pressure and stops rotation when overloaded, but the setting of this withstand load is difficult because work cannot be done if the motor stops frequently with a small load. The target is set high. Therefore, even if a foreign object such as a wire, nylon sheet, or rope is caught in the cutting blade, the safety device will not operate until the cutting blade becomes almost unable to rotate and stops. As a result, it is likely that the wrapped foreign matter will be tightly entangled and cannot be removed, or the machine will be damaged, making it difficult to dispose of it. From an economic point of view, the rotational force of the hydraulic motor of the lawn mower is adjusted by adjusting the rotational speed of the excavator's engine and controlling the hydraulic pump. In other words, a large engine must be rotated at high speed to operate the mower, resulting in large power loss and increased fuel consumption, which is uneconomical. From the viewpoint of ease of attachment and detachment, it is necessary to add an oil line to the excavator in order to drive the hydraulic motor of the mower, which is a cumbersome task.
Furthermore, it is necessary to take measures to prevent foreign matter from entering the oil line during attachment and detachment, and this work is also troublesome.

[Purpose of invention]

The purpose of this invention is to solve the above-mentioned problems, and the purpose is to provide a mower that can easily obtain the rotational speed necessary for mowing, is economical, and is easy to attach and detach from an excavator. shall be.

[Structure of the idea]

The structure of the invention devised to achieve the above purpose is as follows. That is, the present invention is a grass mower that is attached to the arm of a hydraulic shovel type excavator for mowing work, and includes a mounting bracket attached to the arm on the upper side of a hood that covers a cutting blade attached to a rotating shaft. , a shovel is provided with a prime mover that is an internal combustion engine independent of the drive system of the excavator, and the drive shaft of the prime mover and the rotating shaft are connected via a belt to transmit power. This is a mower for type excavators. The type of internal combustion engine is not particularly limited, and may be arbitrarily selected, such as a gasoline engine or a diesel engine.

【Example】

Figure 1 is a perspective view of one embodiment of the present invention, Figure 2 a
2 is a front view of the main part showing the structure of the cutting blade, FIG. 2b is a side view showing the structure of the cutting blade, and FIG. 3 is a schematic diagram showing the state of use. Reference numeral A denotes a lawn mower having a hood 1. The hood 1 covers a cutting blade 5, which will be described later, and also serves as a frame of the mower A, and has side walls 11 on both sides. At the top of the hood 1 are mounting brackets 2, 2 to be attached to the tip of the arm 12 of the excavator 10.
A is provided. The mounting brackets 2 and 2a are provided at two locations facing each other, and mounting holes 3 are provided at two locations in the upper portion thereof. Inside the hood 1, a rotary shaft 4 is installed between side walls 11, and the rotary shaft 4 is provided with a required number of cutting blades 5 each having a "C" shaped tip. More specifically, brackets 40 are provided at three locations on the rotating shaft 4 at intervals of 120 degrees, and the cutting blade 5 is pivoted to the brackets 40 with pins 42 as shown in FIGS. 2a and 2b. It is attached so that it can move freely. Since the cutting blade 5 having this structure cuts the object to be cut, such as grass, into small pieces, it is possible to save time and effort in collecting cut grass and the like. Of course, cutting blades of other constructions can also be used. A pulley (not shown) is provided at one end of the rotating shaft 4, and is driven by a prime mover E provided at the top of the hood 1 via a belt (not shown). The prime mover E has a structure that does not affect fuel supply or lubrication even if it is tilted. Reference numeral 7 is a belt cover that protects the belt, and 8 is a tension pulley operated by a clutch lever 9. (Operation) The operation of this embodiment will be explained with reference to FIGS. 1 to 3. Attachment brackets 2 and 2a are attached to the tip of arm 12 of excavator 10 with attachment pins 16, and mower A is attached. As a result, mower A becomes excavator 1.
It is possible to move in each direction by operating the arm 12 of 0 and the cylinder 18 of the boom 14. For example, the excavator 10 is placed on the embankment, the boom 14 and the arm 12 are operated to set the mower A parallel to the slope, and the boom 14 is moved left and right to cut the grass on the slope. It is. In addition, the mower A is driven by a prime mover E, which is an internal combustion engine installed independently of the engine of the excavator 10, and the mower A can be operated independently of the excavator 10. , it is possible to easily obtain the rotation speed required for mowing work.

[Effect of the idea]

The present invention has the above configuration and has the following effects. (a) The mower is driven by a prime mover that is an internal combustion engine that is installed independently from the drive system of the excavator itself. Therefore, it is possible to easily obtain the rotation speed of about 1800 to 2000 revolutions per minute, which is necessary when cutting grass with the cutting blade. In addition, the movement of the excavator and the operation of each part can be carried out at a suitable engine speed and suitable oil pressure in each case even when the mower is in operation, and there is no risk of sudden start or sudden operation, making it easy to operate. (b) Since the prime mover is an internal combustion engine, unlike a hydraulic motor, it will stop relatively easily when overloaded, for example due to entrainment of foreign objects such as wire, nylon sheet, rope, etc. For this reason, it is possible to prevent foreign objects from becoming strongly entangled and not being removed or damaging the machine, and it is also possible to dispose of them easily. (c) The rotational force of the mower's mower is adjusted independently from the excavator, so there is no need to run the excavator's large engine at high speed to drive the mower, and there is no power loss. It is small, has good fuel efficiency, and is economical. (d) Since the motive power of the mower is an internal combustion engine, work can be started immediately by attaching the mounting bracket to the end of the arm of the excavator using a mounting pin, etc.; There is no need to add an oil line to the machine, and installation and removal work is easy.

[Brief explanation of the drawing]

Figure 1 is a perspective view of one embodiment of the present invention, Figure 2 a
2 is a front view of the main part showing the structure of the cutting blade, FIG. 2b is a side view showing the structure of the cutting blade, and FIG. 3 is a schematic diagram showing the state of use. A: Grass mower, 1: Hood, 2: Mounting bracket, E: Prime mover, 5: Cutting blade.

Claims (1)

[Scope of utility model registration request] The mower is attached to an arm of a hydraulic shovel-type excavator for mowing work, and includes a hood 1 that covers a cutting blade 5 attached to a rotating shaft 4, and a mounting bracket 2 attached to the arm on the upper side of a hood 1; A prime mover E which is an internal combustion engine is provided which is independent of the drive system of the excavator, and the drive shaft of the prime mover E and the rotating shaft 4 are connected via a belt to transmit power. A grass mower for shovel-type excavators that is characterized by: