JPH0574251U - Automatic clutch mechanism of vibration generator in mining machine - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the durability of the supporting portion of the blade of the excavator that vibrates and rotates. [Configuration] Vibration generator 22 for vibrating the blade 20 by connecting a mechanical driving force by connecting the clutch mechanism 74
In the excavator that operates the rotary driver 24 that rotates the blade 20 with the driving force generated by the rotation of the hydraulic motor 42. The clutch cylinder 74 is connected by the hydraulic cylinder 82 and the hydraulic cylinder 82 is rotated. An automatic clutch mechanism for a vibration generator in a digging machine, which is operated by a driving pressure of a driver 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic clutch mechanism for a vibration generator in a digging machine.

[0002]

[Prior Art]

 A digging machine, in which a semicircular blade is vibrated by a vibration generator and rotated by a rotary drive, and the root mass of a root of a tree is cut into a hemispherical shape by the combined oscillating rotary motion of the two, is disclosed in It is known from Sho 53-98237. By the way, conventionally, in order to simplify the structure, the vibration generator is operated by a mechanical driving force by a transmission shaft, and the rotary drive is operated by hydraulic pressure by a hydraulic motor or the like.

[0003]

[Problems to be solved by the device]

 Along with this, the vibration generator operates by operating the clutch mechanism, and the rotary drive operates by switching the directional control valve. However, if this is done, each will also operate independently. In this case, a particular problem is to vibrate the blade under no load. When the blade is vibrated, a large load is applied to the fulcrum of the blade and the vibration generator itself. However, if the blade is unloaded, the inertia of the blade is added to this load, which has a great adverse effect on the life and the like. The present invention addresses such a problem, and the vibration generator automatically operates when the rotary drive is operated.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention takes the following means. That is, in a mining machine that operates a vibration generator that vibrates a blade by connecting a mechanical driving force by connecting a clutch mechanism and a rotary driver that rotates a blade by a driving force generated by rotation of a hydraulic motor, An automatic clutch mechanism for a vibration generator in a digging machine, characterized in that the clutch cylinder is connected and operated by a hydraulic cylinder, and the hydraulic cylinder is operated by the driving pressure of a rotary driver.

[0005]

[Action]

 By taking the above means, when the rotary drive is operated, the clutch mechanism of the vibration generator automatically enters. That is, when the blade is rotated, the blade automatically vibrates. Therefore, even when the blade is unloaded, the blade vibrates when the blade is rotating, which absorbs some of the blade's inertia and causes it to vibrate in situ. The load on the fulcrum is smaller than when it is on.

[0006]

【Example】

 FIG. 5 is a side view of the excavator and FIG. 6 is a plan view of the excavator. The excavator has a pretreatment section 14 at the front of the self-propelled vehicle 10 which can be lifted up by a hydraulic cylinder 12 or the like. A main shaft 16 projects toward the forward direction at the tip of the pretreatment unit 14, and the main shaft 16 and a support arm 18 extending forward from one side of the pretreatment unit 14 form a semicircular blade. The blade 20 vibrates in the rotational direction by vibrating and rotating the main shaft 16 while supporting the blade 20, and the root mass of the tree is cut into a hemispherical shape.

It is the vibration generator 22 and the rotation driver 24, and the transmission mechanism 26 connecting both that give the main shaft 16 an oscillating rotary motion. 2 is a plan cross-sectional view of the pretreatment unit 14 showing these, FIG. 3 is a cross-sectional view of the transmission mechanism 26, and FIG. 4 is a cross-sectional view of the vibration generator 22. A case 28 integrated with this is attached to the outer periphery, and an eccentric body 32 is fixedly fitted to a shaft 30 axially mounted on both sides of the main shaft 16 inside the case 28, and the eccentric body 32 is rotated. The case 28, that is, the main shaft 16 is caused to generate an oscillating motion.

As a drive system for this purpose, a gear 34 is attached to the shaft 30, and the gear 34 is driven by a drive gear 36 loosely fitted to the main shaft 16 via an idle gear 38. Therefore, when the eccentric body 32 rotates, the eccentric load causes the case 28 to vibrate. The eccentric directions of the left and right eccentric bodies 32 are opposite to each other, and the eccentric load due to rotation is generated by being weighted in the same direction. A bevel gear 70 is fixedly fitted to the rear portion of the drive gear 36, and the driving force of the engine is transmitted to a bevel gear 72 meshing with the bevel gear 70 via a clutch mechanism 74. The clutch mechanism 74 will be described later.

The rotary driver 24 is configured such that a worm wheel 40 or the like is loosely fitted to the main shaft 16 and the worm wheel 40 is rotated in a fixed direction (forward direction) by a worm 44 having a hydraulic motor 42 or the like as a drive source. The transmission mechanism 26 transmits the continuous rotation of the worm wheel 40 to the main shaft 16 as an oscillating rotational force. The transmission mechanism 26 is a rocker arm 46 fixed to the main shaft 16 and the worm wheel 40 facing the rocker arm 46. The bracket 48 and the like attached to the. That is, a fitting groove 50 is formed in the bracket 48 in three equal parts in the circumferential direction, and a pin 52 is passed through the fitting groove 50, and two spring receiving discs 56 whose center is stretched by a spring 54 are fitted into the pin 52. To do. On the other hand, the rocker arm 46 is also formed with a pressure receiving groove 58 corresponding to the fitting groove 50, and both ends of the pressure receiving groove 58 receive the respective belt receiving disks 56.

In this case, the side surface of the pressure receiving groove 58 is formed in a U-shape with a recessed center, and the flange 60 next to the fitting groove 50 of the bracket 48 is also formed in a U-shape. The structure is such that the portion 60 is inserted into the pressure receiving groove 58. Further, the position of the pin 52 is set so that the center of the spring receiving disk 56 is located at the center of the U-shape of the pressure receiving groove 58. At this time, the pressure receiving groove 58 is received above the center of the spring receiving disk 56 and is equally received on both sides of the center. The rotary driver 24 and the transmission mechanism 26 described above are housed in the case 24, and the case 24 is fixed to the pretreatment unit 14.

As described above, the vibrating rocker arm 46 and the continuously rotating bracket 44 have different rotational directions and speeds, and the spring 54 absorbs the difference to absorb the difference. As a result, the rocker arm 46, that is, the The main shaft 16 rotates in the rotating direction of the bracket 44 while vibrating by vibrating the vibration motion and the continuous rotation motion. In addition, the reason why the vibrating torque is applied to the main shaft 16 to rotate the plate while vibrating the plate is that the excavation performance is improved by doing so.

FIG. 1 is a hydraulic circuit diagram for driving the rotary drive 24. However, the opening and closing and the direction of the pressure oil supplied to the hydraulic motor 42 of the rotary drive 24 by the hydraulic pump 76 change the direction. Controlled by. By the way, in this case, when a driving pressure is applied to the hydraulic motor 42, the driving pressure switches the directional control valve 80 to operate the hydraulic cylinder 82 which connects and disconnects the clutch mechanism 74. That is, the relief valve 84 is provided on the upper side of the directional switching valve 78 of the hydraulic motor 42, and the directional switching valve 80 that switches with the additional pressure is provided on the upper side of the relief valve 84. At 80, the hydraulic cylinder 82 is operated.

On the other hand, the bevel gear 72 is driven by a driven pulley 88 that is fixedly fitted to a transmission shaft 86 that drives the bevel gear 72. The driven pulley 88 and the output pulley 90 of the engine have a belt 92 is hung around. The above-mentioned clutch mechanism 74 is composed of a tension roller 94 that tightens and loosens the belt 92, and here, the tension roller 94 is operated by the hydraulic cylinder 82. That is, the tension roller 94 is attached to the tip of the rod 82a of the hydraulic cylinder 82, and when the hydraulic motor 42 is driven to increase the pressure applied to the relief valve 84, the direction switching valve 80 is switched by the pressure to switch the hydraulic pressure. The cylinder 82 is extended and the tension roller 94 stretches the belt 92.

[0014]

[Effect of the device]

 As described above, the present invention is as described above, that is, since the vibration of the blade automatically operates when it is rotated, only the blade does not make an idle vibration on the spot, but a vibration based on it. Less damage to the generator and fulcrum. In addition, the vibration and noise associated therewith are reduced. Furthermore, the operation is simplified accordingly, and the situation that the blade vibrates idly due to an erroneous operation is eliminated.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a hydraulic circuit of the present invention.

FIG. 2 is a plan sectional view of a pretreatment unit of the excavator.

FIG. 3 is a cross-sectional view of a transmission mechanism.

FIG. 4 is a transverse sectional view of a vibration generator.

FIG. 5 is a side view of the digging machine.

FIG. 6 is a plan view of the excavator.

[Explanation of symbols]

 20 blade 22 vibration generator 24 rotary driver 42 hydraulic motor 74 clutch mechanism 82 hydraulic cylinder

Claims (1)

[Scope of utility model registration request] 1. A digging machine that operates a vibration generator that vibrates a blade by connecting a mechanical driving force by connecting a clutch mechanism, and operates a rotary driver that rotates the blade by a driving force generated by rotation of a hydraulic motor. In the automatic clutch mechanism of the vibration generator in the excavator, the connection operation of the clutch mechanism is performed by the hydraulic cylinder, and the hydraulic cylinder is operated by the driving pressure of the rotary drive.