JP4940480B2 - Drill head - Google Patents

Description

  The present invention relates to a drill head used for a drilling device, a rock drilling device, and a repairing device for a taphole such as a blast furnace or a converter.

  The drill head applies rotational force and feed force or rotational force, feed force and striking force to a rod having a bit at the tip (hereinafter referred to as a drilling rod), and provides drilling, rock drilling and drilling holes. It will be repaired. Therefore, the drill head incorporates a rotary drive device (for example, a motor, a gear, etc.) for applying a rotational force and a striking device (for example, a piston) for applying a striking force, and the drill head is attached to the leader or guide cell. It is fixed to a slide table (slider) that is slidable along, and to this slide table is connected a feeding device (for example, a chain suspended by a hydraulic cylinder, a sprocket provided at both ends of a leader or guide cell). Then, the drill head is advanced and retracted by the advance and retreat of the slide table, and thereby a feed force and a pulling force are applied to the drilling rod (see, for example, Patent Documents 1 and 2).

  Also, a cleaning swivel is connected to the drill head, fluid (for example, water or air) is supplied from the drilling rod, and drilling, rock drilling or drilling is performed while fluid is ejected from the bit part at the tip of the drilling rod. Some repair the mouth and the like (see, for example, Patent Documents 3 and 4). According to this, in addition to rotating, propelling (feeding), and hitting the drilling rod, fluid is ejected from the bit part at the tip of the drilling rod, so that excavated soil, rock debris, and iron scrap at the spearhead Therefore, the drilling efficiency is improved without obstructing the drilling, rock drilling or repair of the dock.

  Conventionally, a drill head connected with this cleaning swivel has a structure shown in FIG. 2, for example. The drill head 101 includes a shank rod 102 in a transmission housing 110, and a rotary drive device 103 and a striking device 104 are linked to the shank rod 102. A spindle gear 105 is splined to the shank rod 102, and a gear 106 that is rotated by a motor 107 that constitutes the rotation driving device 103 is engaged with the spindle gear 105, and a rotational force is applied to the shank rod 102. Further, a cylinder 108 constituting the striking device 104 is provided immediately above the shank rod 102, and its piston 109 is provided coaxially with the shank rod 102. The piston 109 strikes the head of the shank rod 102 by hitting it. Power is granted. Although not shown, the drill head 101 is fixed to a slide table (slider) that is slidable along a leader or a guide cell. The slide table is suspended by a feeding device (for example, a hydraulic cylinder or a sprocket). The chain is connected and advanced and retracted, so that the drill head also moves forward and backward.

  On the other hand, the cleaning swivel 111 includes a joint adapter 112 and a seal case 113. The joint adapter 112 is provided with a screw hole 114 that is screwed to the shank rod 102 of the drill head 101 on one end side, and screw holes 115 and 116 that are screwed to the inner adapter rod 121 and the outer adapter rod 122 on the other end side. In addition, a fluid supply hole 117 that opens from the screw holes 115 and 116 to the side surface and a discharge hole 118 such as excavated soil are provided.

  One end of each of the inner adapter rod 121 and the outer adapter rod 122 is screwed to the screw holes 115 and 116 of the joint adapter 112 and is disposed in a concentric double pipe. The inner tube 124 is screw-coupled 126, the outer tube 125 is screw-coupled 127 to the other end of the outer adapter rod 122, and the inner adapter rod 121 and the hollow portion of the inner tube 124 are fluid supply passages. 128, and between the inner adapter rod 121 and the outer adapter rod 122 and between the inner tube 124 and the outer tube 125 is a discharge passage 129. The supply passage 128 communicates with the supply hole 117, and the discharge passage 129 is It communicates with the discharge hole 118.

  Accordingly, in the cleaning swivel 111, fluid (for example, air or water) is supplied from the opening 119, and the tip bit portion of the drilling rod 123 (consisting of the inner tube 124 and the outer tube 125) is supplied from the supply hole 117 through the supply passage 128. For example, excavated soil can be discharged from the opening 120 through the discharge passage 129 through the discharge hole 118 together with the fluid by the pressure of the discharged fluid.

According to the drill head 101 to which the cleaning swivel 111 is connected, the drilling rod 101 formed on the inner tube 124 and the outer tube 125 has a rotational force, a driving force (propulsive force), and an impact on the drill rod 101. A force is applied, and a fluid is supplied from the cleaning swivel 111.
Therefore, the drill head 101 is driven while fluid is supplied from the cleaning swivel 111 to apply a rotational force, a feeding force, and a striking force to the drilling rod 123 to repair the drilling, rock drilling, or tap hole. The supply of the fluid at this time may be started after the drilling rod 123 enters the ground in drilling, for example.

Japanese Patent Laid-Open No. 10-37645 Japanese Utility Model Publication No. 4-77789 Japanese Utility Model Publication No. 6-71587 Japanese Utility Model Publication No. 7-20387

However, the drill head 101 is fixed to a slide table (slider) that is slidable along a leader or a guide cell, and a feeding device (for example, a chain suspended by a hydraulic cylinder or a sprocket) is attached to the slide table. The drill head 101 is advanced and retracted by connecting and advancing and retracting, and thereby a feed force (propulsive force) and a pulling force are applied to the drilling rod 123. Therefore, the advance / retreat distance of the drill head 101 is limited by the length of the leader or the guide cell. For example, when the drilling depth is large by drilling, the stroke of the drill head 101 from the start end to the end is limited. The drilling rod cannot reach the predetermined depth. In such a case, when the drill head 101 moves from the start end and reaches the end, the drilling rod 123 in the ground is disconnected from the drill head 101, the drill head 101 is returned to the start end, and the drill head 101 and the ground cutting in the ground are removed. A new drilling rod 123 is added to the hole rod 123, and drilling is performed repeatedly to drill to a predetermined depth.
Separation and addition of the drilling rod 123 from the drill head 101 are performed at the screw couplings 126 and 127 of the inner adapter rod 121 and the outer adapter rod 122.

  However, the conventional drill head 101 and the cleaning swivel 111 are configured as separate bodies, and the screw head 114 of the joint adapter 112 of the cleaning swivel 111 is screwed into the screw shaft 102a of the shank rod 102 of the drill head 101. A cleaning swivel 111 is connected to 101 and a swivel stopper 130 is provided between the drill head 101 and the cleaning swivel 111. Therefore, since the drilling rod 123 (inner tube 124, outer tube 125) is screwed 126, 127 to the inner adapter rod 121 and outer adapter rod 122, the screw coupling 126, Since the rotation for releasing 127 and the rotation for screw connection 126 and 127 are given at the time of addition, the rotational force for releasing the screw connection 126 and 127 or for screw connection is applied to the shank rod 102 of the drill head 101. It also acts on the screw coupling portion between the screw shaft 102a and the screw hole 114 of the joint adapter 112 of the cleaning swivel 111. As a result, the screw connection between the screw shaft 102a of the shank rod 102 of the drill head 101 and the screw hole 114 of the joint adapter 112 of the cleaning swivel 111 is gradually loosened, which may cause damage or a screw connection state. The work for correcting the looseness takes a lot of work and time, and there is a problem that, for example, the efficiency of the whole drilling work is lowered.

  Further, in order to prevent loosening of the screw connection between the screw shaft 102a of the shank rod 102 and the screw hole 114 of the joint adapter 112, sand is engaged with the screw connection part. Burns into a fixed state, and there is a problem that it is damaged or cannot be reused.

  The present invention has been proposed to solve such a conventional problem, and its object is to completely worry about loosening of the screw connection between the drill head and the cleaning swivel even when the drilling rod is detached and added. There is no need to provide a drill head which improves the drilling efficiency.

In order to solve the above problems, a drill head according to the present invention includes a shank rod, a rotary drive device that rotates the shank rod, and a striking device that strikes the shank rod in the transmission housing.
A joint adapter that can be rotated together with the shank rod is integrally connected to a lower end of the shank rod, and the joint adapter portion is covered with a seal case fixedly connected to the transmission housing, and a cleaning swivel is attached together with the seal case. Configure
The shaft center of the lower end surface of the joint adapter has a large-diameter bag screw hole into which the outer adapter rod is screwed, and a large-diameter bag screw into which the inner adapter rod is screwed into the top surface of the large-diameter bag screw hole. A cap screw hole smaller in diameter than the hole is provided concentrically in the axial direction,
Further, the joint adapter is provided with a through hole that opens on a side surface and communicates with the large-diameter cap screw hole, and a through hole that opens on a side surface and communicates with the small-diameter cap screw hole.
The said seal case, a supply port of the fluid communicating said one of the through holes of the through holes, and the outlet of the fluid which communicates with the through hole of the other side, and being provided respectively .

With this configuration, the shank rod is rotated by the rotary drive device and is hit by the hitting device. Since the joint adapter is integrally connected to the shank rod, the rotational force of the rotary drive device and the striking force of the striking device are transmitted to the joint adapter via the shank rod.
The inner adapter rod is screwed and connected to the small-diameter cap screw hole of the joint adapter, and the outer adapter rod is screwed and connected to the large-diameter cap screw hole to form a concentric double tube. An inner rod (inner tube) is connected to the outer adapter rod, and an outer rod (outer tube) is connected to the outer adapter rod. A double tube of the inner rod and outer rod constitutes a drilling rod. Since the joint adapter can be rotated together with the shank rod, when the shank rod is rotated by the rotation driving device, the joint adapter connected to the shank rod also rotates.
Accordingly, the rotational force of the rotary drive device and the impact force of the impacting device are transmitted to the joint adapter via the shank rod, and therefore also transmitted to the drilling rod (inner rod, outer rod) connected to the joint adapter. . Thereby, a rotational force can be applied to the drilling rod by the rotary drive device, and an impact force can be applied by the impact device.

  The drill head is fixed to a slide table (slider) that is slidable along the leader or the guide cell. The slide table has a feeding device (for example, a chain suspended by a hydraulic cylinder or a sprocket). The drill head is advanced and retracted by the advance and retreat of the slide table, and thereby a feed force (propulsive force) and a pulling force can be applied to the drilling rod.

  Furthermore, the inner adapter rod is screwed and connected to the small-diameter cap screw hole of the joint adapter, and the outer adapter rod is screwed and connected to the large-diameter cap screw hole to form a concentric double tube, An inner rod (inner tube) is connected to the inner adapter rod, and an outer rod (outer tube) is connected to the outer adapter rod to form a double tube drilling rod. The hollow portions of the inner adapter rod and the inner rod serve as communication passages, and the communication between the inner adapter rod and the outer adapter rod and between the inner rod and the outer rod serve as communication passages. It becomes a supply passage and the other passage becomes a discharge passage for slime or the like. The one passage communicates with one through hole of the joint adapter, and the other passage communicates with the other through hole of the joint adapter. The seal case has a supply port and a discharge port, the supply port is provided at a position corresponding to the opening of one through hole of the joint adapter, and the discharge port is a position corresponding to the opening of the other through hole of the joint adapter. Is provided.

  Therefore, for example, the passage of the hollow portion of the inner adapter rod and the inner rod is used as a fluid supply passage, and the opening provided at the position corresponding to the opening of the joint adapter through-hole communicating with the supply passage of the seal case is supplied. It corresponds to the opening of the hole of the joint adapter that communicates with this discharge passage in the seal case between the inner adapter rod and the outer adapter rod and between the inner rod and outer rod that communicate with this. If the opening provided at the position is the discharge port, the fluid supplied (press-fit) from the supply port may flow into the supply passage from one through hole of the joint adapter and be ejected from the tip bit portion of the drilling rod. The ejected fluid, along with slime etc., is discharged to the outside through the other passage hole of the joint adapter via the discharge passage. Door can be.

The connection between the shank rod and the joint adapter of the drill head according to the present invention is a spline connection.
With this configuration, the rotational force and impact force transmitted to the shank rod can be reliably transmitted to the joint adapter, and a buffer member can be interposed between the shank rod and the joint adapter. Damage to the connecting portion can be prevented and noise can be prevented.

The drill head according to the present invention has the following effects.
(1) Since the drill head of the present invention is integrally provided with a cleaning swivel, there is no need to attach a separate cleaning swivel to the drill head by screw connection as in the prior art. Therefore, since the drill head of the present invention does not have a screw coupling portion for attaching a separate cleaning swivel to the drill head, it does not occur that the screw coupling is loosened by disconnecting and adding the drilling rod as in the prior art. The accompanying correction work is not necessary, and the work such as biting sand to prevent loosening when screwing is not required. As a result, there is no damage caused by seizure at the screw connection portion.
(2) According to the drill head of the present invention, since the cleaning swivel is integrally provided, a rotational force, a feeding force and a striking force can be applied to the drilling rod, and a fluid can be supplied without attaching the cleaning swivel. Drilling, rock drilling, or repairing a dock, etc. can be performed.
(3) Even if the drilling rod is rotated in order to release the screwing and screw connection by separating and drilling the drilling rod, the present invention does not have the screw coupling part of the drill head and the cleaning swivel. It is possible to work without considering the looseness of the drilling hole, and it is possible to quickly cut and add the drilling rod.

It is sectional drawing of the drill head which shows embodiment of this invention. It is sectional drawing which shows the conventional drill head.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a drill head showing an embodiment of the present invention.
The drill head 1 includes a shank rod 2, a rotary drive device 3 that rotates the shank rod 2, and a striking device 4 that strikes the shank rod 2 in a transmission housing 10, and a lower end of the shank rod 2. A joint adapter 12 that is rotatable together with the shank rod 2 is connected by spline coupling, and the joint adapter 12 is covered with a seal case 13 that is provided continuously with the transmission housing 10 to form a cleaning swivel 11. . Reference numeral 12a denotes a joint adapter pin. Thus, the joint adapter 12 is integrally connected to the shank rod 2.

  A large-diameter cap screw hole 16 into which the outer adapter rod 22 is screwed and an inner adapter rod 21 provided on the top surface of the large-diameter cap screw hole 16 are formed at the shaft center of the lower end surface of the joint adapter 12. A small-diameter cap screw hole 15 is provided concentrically in the axial direction with respect to the large-diameter cap screw hole 16 to be screwed, and the joint adapter 12 has an opening 18a on a side surface, and the large-diameter cap screw hole 16 is provided. And a through hole 17 provided on the side surface and communicating with the small-diameter cap screw hole 15. The seal case 13 corresponds to the opening 17 a of the one through hole 17. A supply port 19 is provided at a position, and a discharge port 20 is provided at a position corresponding to the opening 18 a of the other through-hole 18.

  The rotary drive device 3 is configured by a gear 6 driven by a motor 7 meshing with a spindle gear 5 splined to the shank rod 2. Accordingly, the shank rod 2 can be rotated via the spindle gear 5 by rotating the gear 6 with the motor 7. Reference numeral 5a denotes a spindle gear pin.

  The striking device 4 is provided with a cylinder 8 immediately above the shank rod 2, and its piston 9 is arranged coaxially with the shank rod 2, and the piston 9 strikes the head of the shank rod 2. Therefore, the piston 9 of the cylinder 8 can be driven to hit the head of the shank rod 2.

  An inner adapter rod 21 is screwed and connected to the small-diameter cap screw hole 15 of the joint adapter 12, and an outer adapter rod 22 is screwed and connected to the large-diameter cap screw hole 16. An inner rod (inner tube) 24 is screwed 26 and connected to the inner adapter rod 21, and an outer rod (outer tube) 27 is screwed and connected to the outer adapter rod 22. This is a drilling rod 23. The hollow portions of the inner adapter rod 21 and the inner rod 24 serve as a communication passage 28, and the communication between the inner adapter rod 21 and the outer adapter rod 22 and between the inner rod 24 and the outer rod 25 serve as a communication passage 29. One of the passages serves as a supply passage for fluid (for example, water or air), and the other passage serves as a discharge passage for the fluid or slime used. In this example, the passage 28 will be described as a fluid supply passage and the passage 29 as a discharge passage. Accordingly, the supply passage 28 communicates with one through hole 17 of the joint adapter 12, and the discharge passage 29 communicates with the other through hole 18 of the joint adapter 12.

  The seal case 13 is provided with a supply port 19 and a discharge port 20, the supply port 19 faces the opening 17 a of one through hole 17 of the joint adapter 12, and the discharge port 20 is connected to the other through hole 18 of the joint adapter 12. It faces the opening 18a.

  Accordingly, when a fluid is supplied (press-fitted) from the supply port 19, the fluid can be ejected from one end hole 17 of the joint adapter 12 through the supply passage 28 from the tip bit portion (not shown) of the drilling rod 23. The ejected fluid can be discharged to the outside from the discharge port 20 through the other through hole 18 of the joint adapter 12 through the discharge passage 29 together with slime and the like.

Thus, according to the drill head 1 shown in this embodiment, the joint adapter 12 is integrally connected to the shank rod 2 by spline coupling, and the joint adapter 12 is ground via the inner and outer adapter rods 21 and 22. Since the hole rods 23 (the inner rod 24 and the outer rod 25) are connected to each other, a rotational force can be applied to the drilling rod 23 by rotating the shank rod 2 with the rotation drive device 3, and the hammering rod 4 with the shank rod A striking force can be applied by hitting 2.
Although not shown, the drill head 1 is fixed to a slide table (slider) that is slidable along a leader or a guide cell, and the slide table is suspended from a feeding device (for example, a hydraulic cylinder or a sprocket). The chain is connected and advanced and retracted, and the slide head is advanced and retracted to advance and retract, thereby providing the drilling rod 23 with a feeding force (propulsive force) and a pulling force.

Therefore, in this drill head 1, rotational force, feed force (propulsion force) and striking force are applied to the drilling rod 23 (inner rod 24, outer rod 25), and fluid is supplied from the fluid supply port 19 of the seal case 13. Can be drilled, and the drilling, rock drilling, and repairing of the spout can be performed while fluid is ejected from the tip bit portion of the drilling rod 23.
Even when the drilling rod 23 (inner rod 24, outer rod 25) is disconnected or added during the drilling, rock drilling, and repair of the tap hole, etc., the cleaning swivel 11 can be Since the drill head and the cleaning swivel are not integrally connected to each other, the work can be performed without considering the looseness of the screw connection portion as in the prior art. Conventionally, a drill head and a cleaning swivel have to be prepared, but in the present invention, only the drill head has to be prepared.

  The above embodiment does not limit the present invention, and various modifications are allowed without departing from the spirit of the present invention.

  The drill head of the present invention is useful for a drilling device, a rock drilling device, a repairing device for a taphole such as a blast furnace or a converter, and the like.

DESCRIPTION OF SYMBOLS 1 Drill head 2 Shank rod 3 Rotation drive device 4 Stroke device 5 Spindle gear 8 Cylinder 9 Piston 10 Transmission housing 11 Cleaning swivel 12 Joint adapter 13 Seal case 15 Small diameter bag screw hole 16 Large diameter bag screw hole 17, 18 Through-hole 19 Fluid Supply Port 20 Discharge Port 21 Inner Adapter Rod 22 Outer Adapter Rod 23 Drilling Rod 24 Inner Rod 25 Outer Rod 28 Passage (Supply Passage)
29 passage (discharge passage)

Claims (2)

The transmission housing includes a shank rod, a rotary drive device that rotates the shank rod, and a striking device that strikes the shank rod.
A joint adapter that can be rotated together with the shank rod is integrally connected to a lower end of the shank rod, and the joint adapter portion is covered with a seal case fixedly connected to the transmission housing, and a cleaning swivel is attached together with the seal case. Configure
The shaft center of the lower end surface of the joint adapter has a large-diameter bag screw hole into which the outer adapter rod is screwed, and a large-diameter bag screw into which the inner adapter rod is screwed into the top surface of the large-diameter bag screw hole. A cap screw hole smaller in diameter than the hole is provided concentrically in the axial direction,
Further, the joint adapter is provided with a through hole that opens on a side surface and communicates with the large-diameter cap screw hole, and a through hole that opens on a side surface and communicates with the small-diameter cap screw hole.
The said seal case, a supply port of the fluid communicating said one of the through holes of the through holes, and the outlet of the fluid which communicates with the through hole of the other side, and being provided respectively Drill head.   The drill head according to claim 1, wherein the connection between the shank rod and the joint adapter is a spline connection.

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