JP6796122B2 - Excavator-mounted rotary mowers {Excavator-mounted rotary mowers} - Google Patents

Description

The present invention relates to a shovel mount rotary type weeder, and particularly weeds that are attached to the tip of the arm of a shovel and grow in special areas such as slopes, pastures, fields and hills where it is difficult for vehicles and people to enter. It relates to a weeder configured to easily remove miscellaneous trees.

In general, weeding work to remove weeds and weeds that grow abundantly in the summer is done manually by the worker holding or carrying a brush cutter equipped with an engine weighing about 10 to 20 kg. As a result, heavy equipment makes workers more likely to feel tired, and heavy objects slow down the work speed, making it impossible to do a lot of work, which inevitably requires a large labor force. It has emerged as a problem. In addition, when using a mechanical brush cutter, stones bounce off the cutting blade that rotates at high speed, causing frequent worker safety accidents and the small capacity of the motor, which limits the efficiency of removing vegetation and twigs. is there. Recently, in order to solve these problems, after installing a weeder on the bumper of a general vehicle, the power source of the vehicle is used to more effectively remove vegetation in various places. However, these vehicle weed control machines perform weeding work only in areas where vehicles can enter, and their application range is very narrow. That is, weeds and weeds breeding in special areas such as reeds, pastures, fields, chestnut forests, wetlands and hills where vehicles cannot enter have been raised as a problem that cannot be removed.

Prior art for weed control machines that can perform weeding work even in such special areas is published in Korea Patent No. 10-2012-00190903 (Title of invention: rotary type vegetation removing device using excavator) and registered in Korea. Japanese Patent No. 10-0448278 (title of invention: weed control machine for excavator) has been started.

The Korean Publication No. 10-2012-00190903 is a vegetation removing means which is mounted on a normal excavator provided with an articulated link and has a link connecting portion so as to be mounted on a bucket mounting portion at the tip of the articulated link. It is a vegetation removal device using a shovel including. The vegetation removing means is provided on a main body in which the link connecting portion is connected to the center of the upper part to form an appearance, and on one side surface of the main body. Then, high-pressure hydraulic oil is transmitted from the hydraulic supply system provided in a normal excavator, and both ends are supported in the main body so that it can rotate by receiving the driving force from the drive motor that generates power, and the rotor is installed horizontally. It is characterized by including a shaft and a large number of blades complete with blades that are fastened and assembled so as to have a one-to-one correspondence with a large number of blade mounting portions formed on the rotor shaft at regular intervals.

This equipment can be used for surface surveys to determine in advance whether or not landmines are buried because the work can be carried out by various operation methods according to the work conditions in the expected landmine burial area through the vegetation removal means attached to the excavator. It can be operated as a device. At the same time, it has the advantage that it can be conveniently operated as a device for removing miscellaneous trees and grass in terrain overgrown with vegetation that is difficult for people to access.

The Korean Registered Patent No. 10-0448278 (I) has an arm connecting portion connected to an arm of an excavator and a bucket cylinder between a set of vertical plates installed so as to be separated from each other on the upper part of a base plate. The weeder clamp installed with the cylinder connecting rod sandwiched between them and (II) the rotating shaft installed on the bottom surface of the weeder clamp are rotated as necessary according to the on / off operation of the lock member to make the weeder horizontal. It is installed so that it can rotate freely between the horizontal rotating means that enables rotation and (III) the upper and lower link brackets that are integrally attached to the horizontal rotating means and the vertical rotating means, and is in close contact with the ground of the weeder. A set of link stands that automatically maintain the state and (IV) the rotation axis sandwiched between the rotation axis bosses of the vertical rotation means are automatically rotated vertically according to the inclination of the ground to bring the weeder into close contact with the ground. It is provided with a vertical rotating means for automatically maintaining the state, and (V) a connecting means for connecting the support base of the weeder so as to be inserted between the crimping plate at the tip of the rotating shaft and another crimping plate.

This allows the herbicide to be selectively attached to a shovel that can freely enter special areas such as pastures, fields, and hills where existing herbicide vehicles cannot enter, and is particular about the area. It is possible to effectively carry out weeding work in a wide area. In addition, the weeder is always in close contact with the ground by the free rotation link stand and the automatic rotation of the rotating shaft, without the troublesome operation of moving the weeder up and down according to the bending and tilting of the ground. As a result, the effect of smooth weeding work is provided.

However, in such prior art, the drive motor of the rotary herbicide work machine is assembled on the upper part of the main body, the belt pulley is assembled on the motor shaft, the belt pulley is assembled on the rotor shaft of the rotor, and the belt is assembled between the belt pulleys. It is composed of a method of connecting and transmitting the driving force. Such a drive system causes an increase in manufacturing cost and a failure due to a complicated device structure, and during long-time operation, noise is generated due to belt wear, and power transmission efficiency is lowered, causing energy waste.

In addition, high-pressure hydraulic oil is directly supplied to the drive motor from the shovel's hydraulic supply system, which blocks the supply of hydraulic oil when the drive motor is stopped. At this time, the rotor continues to rotate due to the rotational inertia of the rotor. However, the rotational power rotates the drive motor together, a vacuum is generated on the oil supply side of the drive motor, and the oil inside the drive motor is discharged to the oil outlet side, causing the drive motor and hydraulic piping to be violent. There was a problem that vibration was generated and the drive motor oil leaked, causing a failure and shortening the life of parts.

Korean Published Patent No. 10-2012-00190903 Korean Registered Patent No. 10-0448278

Proposed to solve such problems of the prior art, the present invention uses a rotor supported at both ends inside the main body and installed horizontally to rotate the motor shaft of a drive motor installed in the horizontal direction. By directly inserting and connecting to the shaft and directly transmitting the driving force of the drive motor, the device is simple, the manufacturing cost is reduced, the crops are not caught during the weeding work, and the cause of failure can be reduced. Another object of the present invention is to provide a shovel mount rotary type weeder that is light in weight, has high driving force transmission efficiency, and saves energy.

Another object of the present invention is to allow the oil inside the hydraulic drive motor to flow smoothly through the motor protection valve even if the rotor continues to rotate due to the rotational inertia of the rotor when the oil supply is cut off in order to stop the drive motor. It is designed so that the device can be used safely by eliminating noise and vibration.

The problem-solving means of the present invention for achieving such an object is installed on a main body having a link connecting portion connected to an excavator arm on the upper portion and on both left and right sides of the main body so that it can be rotated by a hydraulic drive motor. In an excavator mount rotary weeder composed of rotors with a large number of blades mounted on the outer peripheral surface, the rotors are mounted on both sides of the main body, the rotors are protected by rotor covers, and rotating members are installed inside. It is installed in the housing so that it can be rotated by the rotor shaft. Further, the motor shaft is horizontally installed in the motor insertion hole formed at the other end of the rotor shaft, mounted as a mounting flange inside the housing, and hydraulically driven by a motor protective case mounted on the other side surface of the main body. It is characterized by the protection of the motor.

According to the present invention, the motor shaft of the horizontally installed hydraulic drive motor is directly inserted and connected to the rotor shaft supported by both ends inside the main body and installed in the horizontal direction to directly apply the driving force of the hydraulic drive motor. By communicating, the equipment is simple, the production unit price is reduced, crops are not caught during weeding work, and the cause of failure can be reduced. In addition, the weight is light, the driving force transmission efficiency is high, energy is reduced, and when proceeding with continuous weeding work while swinging the excavator arm left and right, there are small stones and obstacles on the ground of the workplace and the weeder When caught, the bump link device automatically adjusts the height of the body without the driver operating the excavator boom, protecting the machine by naturally overcoming obstacles, allowing the driver to be fine. You don't have to do any complicated operations, and you can reduce fatigue. In addition, the block cover of the chain type safety cover member absorbs the impact of crushed crops, small stones, twigs, etc. during weed control work, and blocks them from popping out. Furthermore, when the hydraulic oil supply is blocked to stop the hydraulic drive motor, even if the rotor continues to rotate due to the rotational inertia of the rotor, the oil inside the drive motor can flow smoothly through the motor protection valve. It is configured to provide the effect of being able to use the device safely without noise and vibration.

It is a plan view of the excavator mount rotary type weeder according to this invention. It is a front view of the excavator mount rotary type weeder according to this invention. It is a side view of the excavator mount rotary type weeder according to this invention. It is an enlarged configuration view with respect to the "A" part of FIG. It is an exploded perspective view which illustrated the bump link device of the excavator mount rotary type weeder according to this invention. It is an enlarged view with respect to "B" and "C" part of FIG. It is an enlarged view with respect to "B" and "C" part of FIG. It is a block diagram which illustrated the motor protection valve of the excavator mount rotary type weeder according to this invention. It is a hydraulic circuit diagram of FIG. It is an operation state diagram with respect to the bump link device of the excavator mount rotary type weeder according to this invention. It is a block diagram which illustrated the state which the excavator mount rotary type weeder according to this invention was attached to the arm of the excavator.

Hereinafter, examples according to the present invention will be described in detail with reference to the attached drawings.

In the attached drawings, FIG. 1 is a plan configuration view of the shovel mount rotary type weeder according to the present invention, FIG. 2 is a front configuration view of the excavator mount rotary type weeder according to the present invention, and FIG. 3 is a front configuration view according to the present invention. It is a side view of the excavator mount rotary type weeder, FIG. 4 is an enlarged configuration view with respect to the "A" part of FIG. 2, and FIG. 5 is an exploded view showing the bump link device of the excavator mount rotary type weeder according to the present invention. It is a perspective view, and FIGS. 6 and 7 are enlarged views with respect to the “B” and “C” portions of FIG.

As shown in FIGS. 1 to 7, the excavator mount rotary weeder according to the present invention has a bump link device (20) in which a link connecting portion (12) connected to the excavator arm (1) is mounted on the upper portion. ) Is mounted on the upper part, and the main body (10) with the safety cover member (30) mounted on the front and rear surfaces, and the rotating member (52) mounted on both the left and right sides of the main body (10) and made of bearings or the like inside. A rotor (40) installed so as to be rotatable by a rotor shaft (42) inside a built-in housing (50) and having a large number of blades (43) mounted on an outer peripheral surface, and a rotor on the outer surface of the rotor (40). It is provided with a rotor cover (48) for protection of (40) and a motor shaft (62) installed in a hole (42a) having a stepped diameter in the shaft formed at the other end of the rotor shaft (42). It is mounted as a mounting flange (64) inside the housing (50) and is made of a hydraulic drive motor (60) for rotating the rotor shaft (42).

The shape of the large number of blades (43) mounted on the rotor (40) is composed of three blades or a hammer shape like a mallet.

The bump link device (20) includes a lower plate (21) and an upper plate (22) fastened and fixed to the upper part of the main body (10) and the lower part of the link connecting portion (12), and the lower plate (21) and the upper plate ( The lower vertical piece (23) and the upper vertical piece (24) and the lower vertical piece (23), which are vertically fixed to the upper and lower parts of the 22) at intervals and have corresponding through holes (23a) formed therein. ) And the lower rotation holder (25) and the upper rotation holder (26) in which the pin insertion hole (25a) is formed so as to correspond to the through hole (23a) of the upper vertical piece (24), and the lower rotation holder (25). A rotating member (28) composed of a space bar (27) fixed so as to maintain a space between the upper rotating holder (26) and the lower rotating holder (25) and the upper rotating holder (26). It is connected to the pin insertion hole (25a) so that both ends project, and is connected to the through hole (23a) of the lower plate (21) and the upper plate (22) to prevent rotation by the stop ring (29a). It is made up of a large number of fixing pins (29).

The safety cover member (30) is integrally formed in the horizontal direction with an inclined portion (32) fastened and fixed to the front-rear surface / inclined surface of the main body (10) with bolts (31) and below the inclined portion (32). A horizontal portion (33) in which a large number of cover insertion holes (33a) are formed at equal intervals, a vertical portion (34) formed vertically integrally with the end of the horizontal portion (33), and an inclined portion ( 32), a cover bracket (36) composed of both ends of the horizontal portion (33) and the vertical portion (34) and a finishing portion (35) fixed to the front and rear surfaces of the main body (10), and the horizontal portion (33). A horizontal fixing bar (37) that is horizontally fastened and fixed between the finishing portions (35) so as to be located above the cover insertion hole (33a), and a horizontal fixing bar (37) that passes through the cover insertion hole (33a). ) Is hung vertically and is made of a block cover (38) to block crushed crops from popping out during weeding work.

The horizontal fixing bar (37) is fixed by fastening and fixing the fixing bracket (39) to the inclined portion (32) and the horizontal portion (33) with bolts (31), respectively, and is formed at the end of the fixing bracket (39). The groove (39a) is coupled to the horizontal fixing bar (37) and fixed stably.

The block cover (38) is composed of a chain type in which a plurality of rings are connected, passes through a cover insertion hole (33a) by its own weight, and a large number of blocks hang vertically from a horizontal fixing bar (37). Located, the front side, that is, the length of the crop entrance side where the crop flows in during weeding work is connected short, and the length of the back side where the crop is discharged after crushing is connected long, and the crushed material is connected to the outside. Block popping out.

The motor shaft (62) is installed so as to be separated into a hole (42a) having a step in the diameter of the shaft of the rotor shaft (42), and is safely connected as a key (62a).

A motor protection case (70) for protecting the hydraulic drive motor (60) is attached to the other side surface of the main body (10), and both sides of the front and rear surfaces of the main body (10) are used when the weeder is used. A skid (72) that reaches the floor is installed.

Such a hydraulic drive motor (60) operates by receiving oil supply from the oil supply device (2) of the excavator.

On the other hand, as shown in FIGS. 8 and 9, a motor protection valve (80) is mounted between the oil supply device (2) of the excavator and the hydraulic drive motor (60), and the hydraulic drive motor (60) is mounted. In order to stop the flood control, even if the rotor (40) rotates due to rotational inertia when the hydraulic oil supply is cut off, the oil inside the hydraulic drive motor (60) can flow smoothly.

The motor protection valve (80) is coupled to the horizontal bracket (81) on the other side of the main body (10) so as to correspond to the horizontally mounted main body (82) and both sides of the main body (82). A port (83) and A1 for supplying the oil of the oil supply device (2) to the inside of the hydraulic drive motor (60), which is mounted on the inside and interconnected by the inner supply line (90) and the outer supply line (91). It is mounted so as to correspond to both sides of the port (84) and the main body (82) and interconnected by the inner return line (92) and the outer return line (93) to supply the oil of the hydraulic supply motor (60). The B1 port (85) and B port (86) for returning to the device (2) are vertically connected to the inner supply line (90) and the inner return line (92) inside the main body (82). The inner supply line (90), the outer supply line (91), the inner return line (92), and the outer return line are attached to the main body (82) and are attached to the connecting line (87) and the connecting line (87). If (93) is erroneously connected, the check valve (88) that prevents reverse rotation and stops the operation and the returned oil inside the hydraulic drive motor (60) do not flow back to the oil supply device (2). It is made of a shutoff valve (89).

The operating state of the shovel mount rotary type weeder of the present invention configured in this way will be described.

As shown in FIGS. 1 to 7, after connecting the link connecting portion (12) attached to the main body (10) of the weeder to the shovel arm (1) and moving the shovel to a place for weeding work, The excavator's hydraulic supply device (2) is operated, and oil is supplied by the hydraulic drive motor (60) to operate the weed control machine.

That is, the motor protection case (70) mounted on the housing (50) as a mounting flange (64) by the oil supplied by the excavator's hydraulic supply device (2) and mounted on the other side surface of the main body (10). The protected hydraulic drive motor (60) operates and the motor shaft (62) of the hydraulic drive motor (60) steps over the diameter of the shaft formed at the other end of the rotor shaft (42) of the rotor (40). It is installed in a hole (42a) and is mounted so that it can rotate on both the left and right sides of the main body (10) as the rotational force of the hydraulic drive motor (60) is directly transmitted to the rotor (40), and the outer surface is The rotor (40) protected by the rotor box (48) rotates, and the weeding operation is performed by the rotating blade (43).

At this time, the crops crushed during the weeding operation are blocked by the safety cover member (30) attached to the front and rear surfaces of the main body (10). That is, it passes through the cover insertion hole (33a) of the horizontal portion (33) constituting the cover bracket (36) fastened and fixed to the front and rear surfaces of the main body (10), and hangs vertically from the horizontal fixing bar (37). A block cover (38) made of a located chain type blocks it from popping out.

It is desirable that the shape of the large number of blades (43) mounted on the rotor (40) is formed by three blades, or the shape of the blades (43) is formed into a hammer-shaped triangular shape.

When performing continuous weeding work while swinging the excavator arm (1) left and right in this way, if there are small stones or obstacles on the ground of the workplace and the weeder gets caught, the driver operates the excavator boom. Even if it is not done, the height of the main body (10) is automatically adjusted by the bump link device (20), which protects the machine by naturally overcoming obstacles, and the driver does not have to perform fine operations. , Less fatigue.

That is, as shown in FIG. 5, the operating state of the bump link device (20) will be roughly described. The lower vertical piece (23) and the upper vertical piece (23) of the upper and lower parts of the lower plate (21) and the upper plate (22) ( Lower rotation holder inserted into the through hole (23a) of 24) and fixed so that the space bar (27) maintains a distance around the fixing pin (29) whose rotation is prevented by the snap ring (29a). The height of the (25) and the upper rotating holder (26) is automatically adjusted as the main body (10) of the weeder rotates, naturally overcoming small stones and obstacles on the ground. (See FIG. 10)

On the other hand, as shown in FIGS. 8 and 9, a motor protection valve (80) is mounted between the excavator oil supply device (2) and the hydraulic drive motor (60) to stop the hydraulic drive motor (60). Therefore, even if the rotor (40) rotates due to the rotational inertia when the hydraulic pressure is shut off, the oil inside the hydraulic drive motor (60) can flow smoothly.

That is, the A port (83) and the A1 port (84) fastened to the main body (82) through the outer supply line (91) constituting the motor protection valve (80) for the oil supplied by the oil supply device (2). ), The oil supplied to the hydraulic drive motor (60) through the inner supply line (90) and the A1 port (84) and the outer supply line (91), and the oil supplied to the inside of the hydraulic drive motor (60) is the motor. The inner return line (92) and the B port (92) between the B1 port (85) and the B port (86) fastened to the main body (82) through the outer return line (93) constituting the protection valve (80). The hydraulic drive motor (60) operates as it returns and circulates in the oil supply device (2) through the 86) and the outer return line (93).

If the operation of the oil supply device (2) is interrupted in such a state, the flow of oil supplied by the hydraulic drive motor (60) and returned to the oil supply device (2) is blocked, but the hydraulic drive motor (60) ) The internal oil is a check valve (88) attached to a connecting line (97) connected so as to communicate between the inner supply line (90) and the inner return line (92) inside the main body (82). ), And at the same time, the shutoff valve (89) blocks the returned oil inside the hydraulic drive motor (60) from flowing back to the oil supply device (2). The hydraulic drive motor (60) is protected as the hydraulic drive motor (60) rotates at the same time as the rotor (40) that rotates due to the rotational inertia without interruption.

The preferred embodiments of the present invention described above are disclosed for purposes of illustration, and any worker having ordinary knowledge of the present invention may make various modifications within the ideas and scope of the present invention. , Modifications and additions are possible, and such modifications, modifications and additions shall be deemed to fall within the scope of the following claims.

1 Excavator arm 2 Oil supply device 10 Main body 12 Link connection 20 Bump link device 21 Lower plate 22 Upper plate 23 Lower vertical piece 23a Through hole 24 Upper vertical piece 25 Lower rotation holder 25a Pin insertion hole 26 Upper rotation holder 27 Space bar 28 rotation Member 29 Fixing pin 29a Stop ring 30 Safety cover member 31 Bolt 32 Inclined part 33 Horizontal part 33a Cover insertion hole 34 Vertical part 35 Blocking part 36 Cover bracket 37 Horizontal fixing bar 38 Block cover 39 Fixing bracket 39a Hook groove 40 Rotor 42 Rotor shaft 42a Hole with a step in the diameter of the shaft 43 Blade 48 Rotor cover 50 Housing 52 Rotating member 60 Hydraulic drive motor 62 Motor shaft 70 Motor protection case 80 Motor protection valve 81 Horizontal bracket 82 Main body 83 A port 84 A1 port 85 B1 port 86 B port 87 Connection line 88 Check valve 89 Shutoff valve 90 Inner supply line 91 Outer supply line 92 Inner return line 93 Outer return line

Claims (4)

The main body (10) equipped with the link connecting portion (12) connected to the excavator arm (1) on the upper part,
In a shovel mount rotary type weeder composed of a rotor (40) installed so as to be rotated by a hydraulic drive motor (60) and having a large number of blades (43) mounted on the outer peripheral surface.
The rotor (40) is mounted on both sides of the main body (10), and is installed in a housing (50) in which a rotating member (52) is installed so as to be rotatable by a rotor shaft (42).
The rotor shaft (42) motor shaft into the hole (42a) of the axis to the outer periphery formed on one end there is a step (62) is installed, said housing (50) inside the mounting flange (64) is mounted, The hydraulic drive motor (60) is protected by the motor protective case (70) mounted on the side surface of the main body (10).
The shape of the large number of blades (43) mounted on the rotor (40) is composed of either one of three blades or one of a hammer shape.
A rotor cover (48) for protecting the rotor (40) is further configured on the outer surface of the rotor (40) .
A bump link device (20) for rotating the main body (10) is provided between the main body (10) and the link connecting portion (12) connected to the excavator arm (1).
The bump link device (20) includes a lower plate (21) and an upper plate (22) fastened and fixed to an upper portion of the main body (10) and a lower portion of a link connecting portion (12).
A lower vertical piece (23) and an upper vertical piece that are vertically fixed to the upper and lower parts of the lower plate (21) and the upper plate (22) at a distance and have a corresponding through hole (23a) formed therein. (24) and
With the lower rotation holder (25) and the upper rotation holder (26) in which the pin insertion hole (25a) is formed so as to correspond to the through hole (23a) of the lower vertical piece (23) and the upper vertical piece (24). A rotating member (28) made of a space bar (27) fixed so as to maintain a distance between the lower rotating holder (25) and the upper rotating holder (26).
It is connected to the pin insertion hole (25a) of the lower rotation holder (25) and the upper rotation holder (26) so that both ends protrude, and into the through hole (23a) of the lower plate (21) and the upper plate (22). A shovel-mounted rotary weeder characterized in that it is composed of a large number of fixing pins (29) that are coupled and prevented from rotating by a retaining ring (29a) . A safety cover member (30) is used on the front and rear surfaces of the main body (10) to block crushed materials generated during work from spilling out.
An inclined portion (32) fastened and fixed to an inclined surface on the front and rear surfaces of the main body (10), and a horizontal portion formed in the lower portion of the inclined portion (32) in the horizontal direction and a large number of cover insertion holes (33a) are formed. A portion (33), a vertical portion (34) formed perpendicular to the end of the horizontal portion (33), both ends of the inclined portion (32), the horizontal portion (33), and the vertical portion (34), and the main body (10). ), And the cover bracket (36) made of the finished part (35) fixed to the front and rear surfaces.
A horizontal fixing bar (37) that is horizontally fastened and fixed to the finishing portion (35) so as to be located above the cover insertion hole (33a) of the horizontal portion (33).
A claim characterized in that it passes through the cover insertion hole (33a), hangs from a horizontal fixing bar (37), is vertically positioned, and is configured as a block cover (38) for blocking crushed material during weeding work. Item 1. The excavator mount rotary type weeding machine according to item 1. The horizontal fixing bar (37) is horizontal to a hook groove (39a) formed at an end of a fixing bracket (39) fastened and fixed to an inclined portion (32) and a horizontal portion (33) with a bolt (31). The shovel mount rotary type weeder according to claim 2 , wherein the outer peripheral surface of the fixed bar (37) is stably caught. A motor protection valve (80) is mounted between the hydraulic drive motor (60) and the excavator oil supply device (2), and the hydraulic drive is hydraulically driven when the oil supply is cut off in order to stop the hydraulic drive motor (60). It is configured so that the oil inside the motor (60) can flow smoothly.
The motor protection valve (80) includes a main body (82) horizontally mounted on the main body (10) with a horizontal bracket (81).
It is mounted so as to correspond to both sides of the main body (82), interconnected by an inner supply line (90) and an outer supply line (91), and the oil of the oil supply device (2) is introduced into the hydraulic drive motor (60). A port (83) and A1 port (84) for supply,
It is mounted so as to correspond to both sides of the main body (82), is interconnected by an inner return line (92) and an outer return line (93), and returns the oil of the hydraulic supply motor (60) to the oil supply device (2). B1 port (85) and B port (86) for making
A connecting line (87) connected so as to be vertically communicated between the inner supply line (90) and the inner return line (92) inside the main body (82).
When attached to the connecting line (87) and the inner supply line (90), the outer supply line (91), the inner return line (92), and the outer return line (93) are erroneously connected to the main body (82). It is composed of a check valve (88) that prevents reverse rotation and stops the operation, and a shutoff valve (89) that prevents the returned oil inside the hydraulic drive motor (60) from flowing back to the oil supply device (2). The excavator mount rotary type weeder according to claim 1.