JP3483489B2 - Reel device and earth drill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is connected to a hose reel that winds a hydraulic hose for supplying hydraulic oil to a hydraulic device for opening and closing bottom expanding blades of a bottom expanding bucket of an earth drill, and a sensor that detects excavation information from the bottom expanding bucket. The present invention relates to a cable reel that winds a cable , a reel device that includes these hydraulic motors for driving, and an earth drill that includes the reel device.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 3-42157, an earth drill equipped with a bottom expanding bucket has a hose reel for winding a hydraulic hose for supplying hydraulic oil to a hydraulic device for opening and closing the bottom expanding blade of the bottom expanding bucket. And a cable reel that winds a cable connected to a sensor that detects excavation information such as the opening angle of the bottom expanding blade are attached to the reel table below the kelly drive device that rotates the kelly bar. The hose reel and the cable reel are provided with a rotational force in the direction in which the hydraulic hose and the cable are wound around the hose reel and the cable reel so that the hydraulic hose and the cable provided along the kelly bar always maintain a stretched state without slack. A hydraulic motor is provided. Conventionally, such a hydraulic motor is provided in consideration of only applying tension to a hydraulic hose or a cable, and winding when the bottom expanding bucket is removed from the kelly bar. Therefore, the control valve for the hydraulic motor of the hose reel or cable reel has two positions, a switching position for supplying hydraulic oil to the hydraulic motor in the winding direction of the hydraulic hose and a switching position for turning off the supply of hydraulic oil. A control valve having a chisel is provided.

[0003]

When the bottom expanding bucket is attached to the lower end of the kelly bar to form a bottom expanding part that is expanded from the vertical hole, the bottom expanding bucket is connected to the lower end of the kelly bar and joints at the lower ends of the hydraulic hoses and cables. To the bottom bucket joint. In this case, it is necessary to pull down and connect the hydraulic hose and the cable to the joint of the bottom expanding bucket installed on the ground or in the vertical hole. When performing this kind of connection work, the reel device is several meters above the ground, so it is necessary to climb to a high place and pull it down, which requires more work at a high place or a special tool for pulling down. There is a problem that becomes.

In view of the above-mentioned problems, the present invention provides a reel device and a reel device having such a structure that work at a high place for connecting a hydraulic hose and a cable to a bottom expanding bucket is reduced and connection work is facilitated. The purpose is to provide a ground drill equipped with the earth drill.

Further, the present invention provides a reel device having a hose reel and a cable reel, in which the hydraulic hose and the cable can be synchronously lowered, and an earth drill having the reel device. The purpose is to do.

Further, the present invention relates to a reel device having a hose reel and a cable reel, in which the hydraulic hose and the cable are wound in a state of being removed from the bottom expanding bucket,
An object of the present invention is to provide a reel device having a structure capable of synchronously winding a hydraulic hose and a cable, and an earth drill equipped with the reel device.

[0007]

According to the reel device of claim 1 , a bottom expanding bucket is attached to a lower end of a kelly bar rotated by a kelly drive device, and hydraulic oil is supplied to a hydraulic device for opening and closing the bottom expanding blade of the bottom expanding bucket. A hose reel that winds a hydraulic hose, and a cable reel that winds a cable connected to a sensor that detects excavation information of a bottomed bucket in an earth drill provided under the Kelly drive device, wherein the hose reel and the cable reel Oil flow passage and winding
And a switching flow path of the hydraulic oil actuating the come down direction
Common controller for driving hose reels and cable reels
Equipped with a trawl valve , the
The flow rate of hydraulic oil flowing through the hydraulic motor for driving the hose reel
Hydraulic oil flowing through the hydraulic motor for driving the cable reel
It is characterized in that a flow rate control means for reducing the flow rate is provided .

[0008] Thus, the reel apparatus, the reel device having a cable reel not hose reel only, as a control valve, hose reel and Cave
By providing those having switching flow path of decreasing winding Ruriru, by operating the control valves, hydraulic hoses and cables can be fed out by the operation of the hydraulic motor, a tool is not required for the aerial or special cuts .

According to a second aspect of the present invention, in the reel apparatus according to the first aspect , the flow rate control means comprises a flow dividing valve that sets the flow rate on the hydraulic motor for driving the cable reel to be smaller than the flow rate on the hydraulic motor for driving the hose reel. And

According to a third aspect of the present invention, there is provided the reel device according to the first aspect , wherein the flow rate control means comprises a throttle valve inserted into a hydraulic reel side cable passage for driving the cable reel.

If flow rate control means such as a shunt valve and a throttle valve are provided as in the first to third aspects, the flow rate of the hydraulic oil to each motor can be controlled when the both hydraulic motors are wound and lowered. The flow rate can be set to an appropriate value according to the load, which allows the hydraulic hose and the cable to be wound up and down in synchronism at substantially the same speed.

A reel device according to a fourth aspect is the reel device according to the first aspect.
3 is characterized in that the flow rate control means is of a variable type.

As described above, if the flow dividing valve, the throttle valve, etc. are made variable, the flow dividing ratio can be properly set in each earth drill, and the secular change and the winding diameter of the reel device can be changed. When the resistance of the unwinding operation changes, it is possible to properly set the diversion ratio again.

A reel device according to a fifth aspect of the present invention is the reel device according to the first to fourth aspects.
In any one of the above items, pipelines through which hydraulic oil flows when operating the reels in the winding direction and the winding-down direction are respectively branched, and the flow rate control means is provided in each branch pipeline. Is characterized by.

As described above, by providing each flow rate control means independently in the forward and backward return conduits, proper flow rate control can be performed as compared with the case where the common forward and backward flow rate control is performed.

The earth drill of claim 6 is the same as that of claim 1.
It is characterized in that the reel device according to any one of 1 to 5 is provided.

As described above, by providing the reel device according to any one of claims 1 to 5 , each of the above-mentioned actions can be exhibited.

[0018]

1 (A) is a side view showing an embodiment of an earth drill equipped with a reel device according to the present invention, and FIG. 1 (B) is a partially enlarged view thereof. As shown in FIG. 1, the earth drill has a boom 2 attached to a self-propelled body 1, a hoisting rope 4 that is wound and unwound by a winch 3 mounted on the body 1 is hung from the top of the boom 2, and a kerry bar 5 is used. Is connected to and supported by a swivel joint (not shown). The kelly bar 5 is vertically movably inserted into a hole of the rotary drive body of the kelly drive device 6. The Kelly drive device 6 is attached to the top of a front frame 7 which is attached to the main body 1 or the boom 2 so as to be capable of undulating. A bottom expansion bucket 8 is attached to the lower end of the kelly bar 5.

As shown in FIG. 1 (B), a reel table 10 is attached to the lower portion of the Kelly drive device 6 via a center joint 9 for supplying hydraulic oil from the non-rotating portion to the rotating portion. Horse reels 11A and 11B and a cable reel 12 are mounted on the reel table 10. The hose reels 11A and 11B are each one hydraulic hose 13A and 13B for reciprocating hydraulic fluid connected to a hydraulic device such as a hydraulic cylinder 19 or 20 (see FIG. 2) for opening and closing the bottom expanding blades provided in the bottom expanding bucket 8. Each is a roll.

The cable reel 12 has a cable 1 connected to a sensor 29 (see FIG. 2) for detecting the opening angle of the bottom expanding blade.
It is a roll of four. As shown in FIG. 1 (A), these hydraulic hoses 13A, 13B and the cable 14 are guided by a guide 15 provided on the kelly bar 5, and along with the extension of the kerry bar 5, the reels 11A, 1
It is pulled out from 1B and 12 and rotates together with the kerry bar 5, the reel table 10 and the bottom expanding bucket 8 during excavation work.

FIG. 2 is a hydraulic electric circuit diagram showing an embodiment of the reel device according to the present invention. In FIG. 2, 1
Reference numerals 6 and 17 denote hydraulic pumps mounted on the main body 1. The hydraulic pump 16 is used as a hydraulic source for hydraulic cylinders 19 and 20 which are hydraulic devices for opening and closing the bottom expanding blades of the bottom expanding bucket 8. Horse reels 11A, 1
1B and each hydraulic motor 21A of the cable reel 12,
Used as a hydraulic source for 21B and 22. 23, 2
Reference numeral 4 is a relief valve for setting the maximum pressure of the discharge hydraulic pressure of each hydraulic pump 16, 17. 25 is the hydraulic cylinder 19,
20 is a control valve, 26 is the hydraulic motor 21A,
21B and 22 are common control valves. The control valve 26 is provided on both sides of the intermediate stop position,
It has a position on the winding side which is a switching position a on the left side and a position on the winding side which is a switching position b on the right side. 26
Reference characters a and 26b are solenoids of the control valve.

On the reels 27A and 27B of the hose reels 11A and 11B, the control valve 25 is switched to the left position c and the right position d, respectively, and the hydraulic cylinder 1 is moved.
Hydraulic hoses 13A and 13 to which pressure oil is supplied when operating the bottom expanding blades 9 and 20 in the opening direction and the closing direction, respectively.
Each B is rolled. The cable 14 connected to a sensor 29 for detecting the opening angle of the bottom expanding blade, that is, the excavation diameter is wound around the winding frame 28 of the cable reel 12.

Reference numeral 30 denotes the hydraulic motors 21A, 21B and 2
2 is a relief valve provided in a pipe line 32 branched from a pipe line 31 to which pressure oil is supplied at the time of winding. In the relief valve 30, the hydraulic motors 21A, 21B and 22 operate as hydraulic pumps when the tension of the hydraulic hoses 13A and 13B and the cable 14 is set and the hydraulic hoses 13A and 13B and the cable 14 are forcibly unwound by the extension of the kelly bar 5. The hydraulic oil is supplied to the pipe lines 33 and 46 which become negative pressure when the operation is performed.

Reference numeral 34 designates the hydraulic motors 21A, 21B and 22.
When operating the hose reels 11A, 11B and the cable reel 12 in the lowering direction, hydraulic motors 21A, 21B
And a flow dividing valve that distributes the flow rate to the hydraulic motor 22 at a constant ratio, and in this example, an example of a variable flow dividing valve is shown. Here, the ratio of the respective flow passages e and f in the flow dividing valve 34 is, for example, about 8: 1 (the hydraulic motor 21A,
21B hydraulic motor 22 for flow to individual motors
The flow rate ratio is set to about 4: 1).

Reference numerals 35 and 36 are provided between the conduit 32 having the relief valve 30 and the conduits 33 and 46 , respectively, in order to prevent short-circuiting of the distribution passages e and f at the outlet of the diversion valve 34. It is a check valve.

37 and 38 are hydraulic motors 21A and 21B,
22 is a hose reel 11A, 11B, a cable reel 1
A check valve for returning the oil discharged from these motors to the oil tank 39 when operating in the winding direction of No. 2 , 40
Is a throttle valve that throttles the flow rate of hydraulic oil to the hydraulic motor 22 of the cable reel 12 when operating in the winding direction.

In this structure, when the bottom expanding operation is not performed, the control valve 26 is in the neutral position, and the hydraulic oil discharged from the hydraulic pump 17 is unloaded by the control valve 26 and returned to the oil tank 39. During bottom expansion work, the solenoid 26a of the control valve 26 is excited to switch to the a position. As a result, the pressure oil flows through the center joint 9 to the conduit 31 and is supplied to the hydraulic motors 21A, 21B and 22.

When the bottom expanding bucket 8 is lowered in this state, the hydraulic motors 21A, 21B, 22 are forcibly rotated in the reverse direction, and the pressure oil supplied to the conduit 31 is relieved by the relief valve 30 to cause a hydraulic hose. 13A, 13B and the cable 14 will be pulled by a constant tension. At this time, the hydraulic motors 21A, 21B, 22 act as hydraulic pumps, and the oil flows from the hydraulic motors 21A, 21B to the conduit 3
It is discharged to the first side and circulates in the circulation path of the relief valve 30, the check valve 35, the conduit 33, and the hydraulic motors 21A and 21B. The oil discharged from the hydraulic motor 22 circulates in the relief valve 30, the check valve 36, the pipe line 46 , and the circulation path of the hydraulic motor 22.

In this way, the hydraulic motors 21A, 21B,
When the valve 22 acts as a hydraulic pump, the relief valve 30 serves to prevent cavitation by providing the relief valve 30 near these hydraulic motors.
Further, even during the bottom excavation at the hole bottom, the hydraulic pressure set by the relief valve 30 is supplied to the hydraulic motors 21A, 21B, 22 so that the hydraulic motors 21A, 21B, 22 are connected to the hydraulic hoses 13A, 13B and the cable 14. A constant tension is applied to the hydraulic pressure hose to prevent the hydraulic hoses 13A and 13B and the cable 14 from projecting due to the rotation of the kelly bar 5.

In order to attach the bottom expanding bucket 8 to the lower end of the kelly bar 5, the hydraulic hoses 13A and 13B and the cable 1 are attached.
When feeding 4, the solenoid 26b of the control valve 26 is excited. As a result, the control valve 26 is switched to the b position, and the pressure oil divided from the pipe 41 by the diversion valve 34 is supplied to the hydraulic motors 21A, 21B and 22 via the pipes 33 and 46 , respectively. As a result, the hydraulic motors 21A, 21B and 22 are connected to the shunt valve 3
4 allows the hydraulic motors 21A, 21B and 22 to rotate irrespective of the load.

Normally, the load on the cable reel 12 is light,
Since the loads on the hose reels 11A and 11B are heavy and the winding diameters are different, the capacities of the hydraulic motors 21A and 21B and the hydraulic motor 22 are also different. Therefore, these hydraulic motors are simply connected in parallel to supply pressure oil. If supplied, only the cable reel 12 will rotate, and it will be difficult to synchronize the lowering. Therefore, in the present embodiment, the diversion valve 34 is provided to divert the flow amount to a flow rate suitable for each motor, thereby enabling the tuning. Therefore, when connecting the bottom expanding bucket 8 to the kelly bar 5, the hydraulic hoses 13A and 13B and the cable reel 14 can be simultaneously wound down without requiring a special tool or rising to a high place.

Further, by making the diversion valve 34 a variable diversion valve, it is possible to properly set the diversion ratio for each actual machine by first testing the diversion ratio and the degree of synchronization with the actual machine in each earth drill. When the resistance of the unwinding operation changes due to aging or changes in the winding diameter of the reel device, the diversion ratio can be properly set again.

After the excavation work is completed, the bottom expanding bucket 8 is removed from the kelly bar 5, and the joints of the hydraulic hoses 13A and 13B and the cable 14 with the bottom expanding bucket 8 are removed. Then, the solenoid 26a of the control valve 26 is excited again to wind up the hydraulic hoses 13A and 13B and the cable 14, but in this case, these must be taken up slowly. However, also in this case, since the load on the cable reel 12 is light, the hydraulic motors 21A, 21B, 2
If pressure oil is supplied to 2, only the cable reel 12 will rotate. Therefore, by providing the throttle valve 40,
The hose reels 11A and 11B and the cable reel 12 are wound in synchronization with each other. This throttle valve 40
Is also a variable throttle valve.

As described above, the flow dividing pipes e and f for winding down and the flow pipes g and h for winding up are branched for synchronizing the winding, and the dividing valve 34 and the throttle valve for tuning are branched. By independently providing 40 and 40, an appropriate flow rate can be set according to each load.

In FIG. 2, a diversion valve may be provided instead of the throttle valve 40 on the control valve 26 side of the conduit 31. Further, as shown in FIG. 3A, instead of the flow dividing valve 34 and the throttle valve 40, a pipe line 46 of the cable reel 12 is provided.
By providing the throttle valve 42 on the hose reel 11
Approximate tuning can be achieved between A, 11B and the cable reel 12. In this case, by adjusting the flow rate of the variable throttle valve 42 with emphasis on the tuning on the lowering side,
The expansion bucket can be easily attached to the kelly bar 5. Even if there is a slight speed difference between the hydraulic hoses 13A and 13B and the cable 14, the winding is performed by the tension set by the relief valve 30 until the lower ends of the hoses finally come into contact with the stopper (not shown). You can wind it up with.

Further, as shown in FIG. 3B, check valves 44 and 45 instead of the flow dividing valve 34, and a throttle valve 43 that throttles the flow rate at the time of unwinding on the cable reel side are also provided. The purpose can be achieved.

[0037]

According to the first aspect of the present invention, a switching passage for operating oil for operating the hose reel and the cable reel in the winding direction and a switching passage for operating oil for operating the hose reel and the cable reel in the unwinding direction. Equipped with a control valve with a hydraulic hose and cable.
The bull can be paid out by the operation of the hydraulic motor. Therefore, work at high places can be reduced, and a special tool for pulling down is unnecessary.

Further, as the control valve, with a common control valve for the hose reel and cable reel drive, the In operation of the hydraulic motor, said cable reel from the hydraulic fluid flow through the hydraulic motor hose reel drive Flow rate control means for reducing the flow rate of hydraulic oil flowing through the drive hydraulic motor (for example, the flow dividing valve according to claim 2).
Or the throttle valve according to claim 3) , it is possible to set the flow rate of the hydraulic oil to each motor to an appropriate flow rate according to the load when the both hydraulic motors are wound and lowered. By doing so, the hydraulic hose and the cable can be wound up and down at the same speed in synchronization with each other.

According to the fourth aspect , in the first to third aspects, since the flow rate control means is made variable, the split ratio can be properly set in the earth drill, and the secular change and the winding diameter of the reel device can be achieved. When the resistance of the unwinding operation is changed due to the change of, etc., the diversion ratio can be properly set again.

According to a fifth aspect of the present invention , in the first to fourth aspects, the pipelines through which the hydraulic oil flows when the two hydraulic motors are operated in the winding direction and the lowering direction are provided separately. In addition, since each of the flow rate control means is provided, the proper flow rate control can be performed as compared with the case where the common flow rate control is performed in the forward and return pipelines.

According to a sixth aspect , the first to fifth aspects are provided.
Since any one of the reel devices is provided, it is possible to provide an earth drill capable of exerting the effects of each claim.

[Brief description of drawings]

1A is a side view showing an example of an earth drill to which the present invention is applied, and FIG. 1B is a partially enlarged view thereof.

FIG. 2 is a hydraulic electric circuit showing an embodiment of a reel device according to the present invention.

3 (A) and 3 (B) are hydraulic circuit diagrams showing another embodiment of the reel device of the present invention .

[Explanation of symbols]

1: body, 2: boom, 3: winch, 4: hoisting rope, 5: kerry bar, 6: kerry drive device, 7: front frame, 8: bottom bucket, 9: center joint, 10: reel table, 11A, 11B: hose reel, 12: cable reel, 13A, 13B: hydraulic hose, 14: cable, 19 and 20: hydraulic cylinder for opening and closing bottom expanding blades, 25, 26: control valve, 30: relief valve, 34: diversion valve, 35 ~ 38: Check valve, 40,
42, 43: Variable throttle valve, 44, 45: Check valve

Front Page Continuation (72) Hideo Ozawa Inventor Hideo Ozawa 650 Jinrachicho, Tsuchiura City, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant (56) References JP 59-65196 (JP, A) JP 1-299992 ( (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21B 19/08 E21B 11/00

Claims (6)

(57) [Claims] 1. A buttonhole rotated by a Kelly drive device.
Attach a bottom expansion bucket to the bottom of the Apply hydraulic oil to the hydraulic device for opening and closing the bottom expanding blades of the bottom expanding bucket.
The hose reel that winds up the hydraulic hose to be supplied and the bottom expansion bar
Cave connected to a sensor that detects excavation information on the ket
And a cable reel for winding the
In the earth drill provided at the bottom of Winding up the hose reel and the cable reel
Switching passage for hydraulic oilAnd unwindIn the direction
The flow path for switching the operating oilHose reel
And a common control valve for driving the cable reel
Prepare, Drive the hose reel when both reels are operating
From the hydraulic oil flow rate flowing through the hydraulic motor for
Flow that reduces the flow rate of hydraulic oil flowing through the hydraulic motor
Provided a quantity control means A reel device characterized by the above. 2. The reel device according to claim 1 , wherein the flow rate control means comprises a shunt valve for setting the flow rate on the hydraulic motor for driving the cable reel to be smaller than the flow rate on the hydraulic motor for driving the hose reel. 3. The reel device according to claim 1 , wherein the flow rate control means comprises a throttle valve inserted in a hydraulic reel side cable passage for driving a cable reel. 4. The reel device according to claim 1 , wherein the flow rate control means is a variable type. 5. The pipe according to claim 1 , wherein when the both reels are operated in a winding direction and a winding direction, pipes through which hydraulic oil flows are respectively branched and provided in each branch pipe. And a reel device, each of which is provided with the flow rate control means. 6. An earth drill comprising the reel device according to any one of claims 1 to 5 .