Hydraulic sliding wrench for percussion drills

Abstract

This hydraulic sliding wrench for percussion drills eliminates the dangerous manual wrench work, prevents the inner rod from falling even during upward drilling, and avoids the need for a complex clamping structure. [Solution] The slide spanner 1 is attached to the main body 140 of the percussion drill 100 and clamps the inner rod 7 of the double-tube rod 2 used for drilling. The device includes a rod spanner 10 that grips the notch 7a of the inner rod 7 to perform clamping, a mounting means for attaching the rod spanner 10 to the main body 140, and a hydraulic drive means for reciprocating the rod spanner 10 in the gripping direction.

Description

Technical Field

[0001] The present invention relates to a hydraulic slide wrench used for clamping an inner rod when incorporated into a percussion drill.

Background Art

[0002] A percussion drill includes a hammer sub attached to the tip of a drill head for transmitting a striking force and a rotational force to a drilling rod composed of a double pipe rod, and a cleaning swivel provided between the hammer sub and the drilling rod for supplying and discharging a drilling fluid to the double pipe rod. In such a percussion drill, a spanner operation for pulling out an inner rod from the double pipe rod used for drilling is performed. The spanner operation involves an operation of biting a spanner into the inner rod, and conventionally, the spanner operation has been performed manually by an operator. Patent Document 1 discloses a double wrench for pulling out an inner rod of a double pipe rod. The operation of this double wrench is also performed manually by an operator. In addition, it is necessary to add and separate the double pipe rods used for drilling, and a drill having a triple clamp structure including an outer rod clamp, an inner rod clamp, and a rod breaker for this purpose is also used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Manual wrench work poses a risk of the worker's hand getting caught, leading to work accidents and machine damage. Furthermore, in upward drilling, there is a problem with the inner rod falling when the drill head is retracted after interrupting wrench work. On the other hand, drills with a triple clamp structure equipped with an inner rod clamp have a longer overall length for clamping, making the structure more complex. Additionally, the rod thins or the clamp pieces wear down, leading to slippage during clamping. This invention has been made in consideration of the problems of the conventional methods, and aims to provide a hydraulic sliding spanner for percussion drills that not only eliminates dangerous manual work, prevents the inner rod from falling even during upward drilling, and does not require a complex clamping structure. [Means for solving the problem]

[0005] The present invention is a spanner attached to the body of a percussion drill for clamping the inner rod of a double-tube rod used for drilling, characterized in that it comprises a rod spanner that engages with a notch in the inner rod to perform the clamping, a mounting means for attaching the rod spanner to the body, and a hydraulic drive means for reciprocating the rod spanner in the direction of engagement.

[0006] In the present invention, the mounting means comprises a support table attached to the main body along a direction intersecting the inner rod, and a slide bracket to which the rod spanner is attached and which is slidably mounted on the support table, and the hydraulic drive means is characterized by reciprocating the slide bracket.

[0007] Furthermore, the mounting means comprises a spanner cover attached to the main body along a direction intersecting the inner rod, and a slide table to which the rod spanner is attached and which is reciprocally movable in a direction intersecting the inner rod, and the hydraulic drive means is characterized by reciprocating the slide table.

[0008] Furthermore, the hydraulic drive means is characterized by being a hydraulic cylinder attached to the mounting means and extending and retracting along a direction intersecting the inner rod.

[0009] Furthermore, the hydraulic drive means is characterized by comprising a rack gear provided on the mounting means so as to extend in a direction intersecting the inner rod, a pinion gear meshing with the rack gear, and an oil motor attached to the mounting means for rotating the pinion gear in forward and reverse directions.

[0010] Furthermore, the mounting means is characterized by being provided with a stopper that restricts the movement of the rod spanner in the opposite direction. [Effects of the Invention]

[0011] According to the present invention, the rod spanner engages with and clamps the inner rod using a hydraulic drive mechanism, eliminating the need for dangerous manual spanner work. Furthermore, even during upward drilling, the rod spanner maintains the clamped state of the inner rod, preventing it from falling even when the drill head is retracted. In addition, since a triple clamp structure is not required, the structure can be simplified. Moreover, because the rod spanner securely clamps the inner rod through the drive of the hydraulic drive mechanism, slippage is eliminated. [Brief explanation of the drawing]

[0012] [Figure 1] This is an overall side view of the first embodiment of the present invention. [Figure 2] This is a partially broken perspective view of the main part of the first embodiment. [Figure 3] This is a perspective view of the first embodiment before clamping. [Figure 4] This is a perspective view of the first embodiment when clamped. [Figure 5] This is a perspective view of the area around the clamped state of the first embodiment. [Figure 6]This is an overall perspective view of a second embodiment of the present invention. [Figure 7] This is a perspective view of the second embodiment before clamping. [Figure 8] This is a perspective view of the second embodiment when clamped. [Figure 9] This is a perspective view showing the appearance of the second embodiment when clamped. [Modes for carrying out the invention]

[0013] The present invention will be described in detail below with reference to the illustrated embodiments. In each embodiment, the same components are denoted by the same reference numerals.

[0014] (First Embodiment) Figures 1 to 5 show a first embodiment of the present invention. Figure 1 is a side view showing the hydraulic slide spanner 1 (hereinafter referred to as slide spanner) of this embodiment placed on a percussion drill 100. As shown in Figure 1, the percussion drill 100 has a main body 140 comprising a drill head 110, a cleaning swivel 120, and a mast 130 to which these are movably mounted. The drill head 110 applies impact and rotational force to the double-tube rod 2 that performs drilling. The cleaning swivel 120 is connected to the drill head 110 and supplies drilling fluid to the double-tube rod 2 and discharges the drilling fluid containing soil after drilling. The drill head 110 and the cleaning swivel 120 are mounted on the mast 130 so that they can move in the axial direction.

[0015] The slide spanner 1 grips the inner rod 7 of the double pipe rod 2 used for excavation by means of a clamp, and is provided on the mast 130 of the main body 140. On both sides of the slide spanner 1, a rod breaker 3 and an outer clamp 4 are arranged so as to sandwich the spanner 1. The rod breaker 3 releases the screw connection between the outer rods 5 and the screw connection between the inner rods. The outer clamp 4 grips the outer rod 5 by means of a clamp. These slide spanner 1, rod breaker 3, and outer clamp 4 are attached to the clamp bracket 6 that constitutes the mast 130.

[0016] The slide spanner 1 of this embodiment will be described with reference to FIGS. 2 to 5. A support table 8 extending along a direction orthogonal to the double pipe rod 2 is fixed to the clamp bracket 6 of the mast 130. A slide bracket 9 is attached to the support table 8 so as to be reciprocally slidable, and a rod spanner 10 is assembled to the slide bracket 9 by bolts 28. The slide bracket 9 is guided by a slide bracket guide 11 and slides. As a result, the rod spanner 10 reciprocates in the direction of the inner rod 7 and the opposite direction. The above support table 8 and slide bracket 9 constitute attachment means for attaching the rod spanner 10 to the clamp bracket 6 (the main body 140 of the percussion drill 100).

[0017] The rod spanner 10 engages with the notch 7a at the tip of the inner rod 7 by moving toward the inner rod 7, and by engaging with the notch 7a, the rod spanner 10 grips the inner rod 7 in a clamped state. This engagement prevents the rotation of the inner rod 7 and also prevents the inner rod 7 from falling off.

[0018] The reciprocating movement of the rod spanner 10 is performed by hydraulic drive means. The hydraulic drive means is constituted by a hydraulic cylinder 12 provided along the length direction inside the slide table 8 (FIG. 2), and the rod spanner 10 is attached to the hydraulic cylinder 12 via the slide bracket 9.

[0019] In addition to the above, a stopper 13 is attached to the support table 8. The stopper 13 is mounted so as to be located at the end of the support table 8 in the longitudinal direction, and restricts the movement of the slide bracket 9 in the reversal direction. This restricts the movement of the rod spanner 10 in the reversal direction, preventing the slide bracket 9 and rod spanner 10 from coming off.

[0020] In this embodiment of the slide spanner 1, the rod spanner 10 engages with and clamps the inner rod 7 by the drive of the hydraulic cylinder 12, eliminating the need for dangerous manual spanner work. Furthermore, even during upward drilling, the rod spanner 10 maintains the clamped state of the inner rod 7, preventing the inner rod 7 from falling even when the drill head is retracted. In addition, since a triple clamp structure is not required, the structure can be simplified. Moreover, because the rod spanner 10 securely clamps the inner rod 7 by the drive of the hydraulic cylinder 12, slippage is prevented.

[0021] (Second Embodiment) Figures 6 to 9 show a second embodiment of the present invention. The percussion drill 100 is equipped with a drill head 110, a cleaning swivel 120, and a mast 130, similar to the first embodiment (Figure 6).

[0022] As shown in Figures 7 to 9, the slide spanner 21 of this embodiment is attached to a clamp bracket 6 provided on the mast 130. The slide spanner 21 comprises a spanner cover 22 fixed to the clamp bracket 6 along a direction intersecting the inner rod 7, and a slide table 23 provided on the spanner cover 22. The spanner cover 22 and the slide table 23 constitute mounting means for attaching the rod spanner 10 to the clamp bracket 6 (the main body 140 of the percussion drill 100).

[0023] The spanner cover 22 is fixed to the clamp bracket 6 so as to extend along a direction perpendicular to the double-tube rod 2. The slide table 23 is inserted into the spanner cover 22 so as to reciprocate along the direction in which the spanner cover 22 extends, and the rod spanner 10 is attached to this slide table 23. As the slide table 23 reciprocates, the rod spanner 10 reciprocates together with it, linearly advancing and retracting relative to the inner rod 7 of the double-tube rod 2, and engaging and disengaging from the notch 7a of the inner rod 7.

[0024] In this embodiment as well, a stopper 13 is provided. The stopper 13 is fixed to the end portion of the spanner cover 22, thereby restricting the movement of the rod spanner 10 in the retraction direction (return direction) and preventing the slide bracket 9 and the rod spanner 10 from coming off.

[0025] In this embodiment as well, the reciprocating movement of the rod spanner 10 is performed by a hydraulic drive mechanism. As shown in Figures 7 and 8, the hydraulic drive mechanism in this embodiment is formed by a rack gear 25 fixed to the slide table 23 and extending in the same direction as the slide table 23, an oil motor 27 attached to the clamp bracket 6, and a pinion gear 26 attached to the oil motor 27 and meshing with the rack gear 25. In this hydraulic drive mechanism, the pinion gear 26 moves in the reciprocating direction as the oil motor 27 rotates in forward and reverse directions, causing the rack via 25 to reciprocate, thereby engaging and disengaging the rod spanner 10 from the inner rod 7.

[0026] In this embodiment of the slide spanner 21, the rod spanner 10 engages with and clamps the inner rod 7 when driven by the oil motor 27, eliminating the need for dangerous manual spanner work. Furthermore, even during upward drilling, the rod spanner 10 maintains the clamped state of the inner rod 7, preventing the inner rod 7 from falling even when the drill head is retracted. In addition, since a triple clamp structure is not required, the structure can be simplified. Moreover, because the rod spanner 10 securely clamps the inner rod 7 when driven by the oil motor 27, slippage is prevented. [Explanation of Symbols]

[0027] 1 21 Slide Wrench 2 Double-tube rod 3 Rod breaker 4 Outer clamps 5 Outer rod 6 clamp brackets 7 Inner Rod 7a Notch 8 Support Table 9. Slide Table 10 Rod wrenches 11 Slide bracket 12 Hydraulic Cylinders 13 Stopper 22 Spanner cover 23. Slide Table 25 Rack Gear 26 Pinion Gear 27 Oil motor 28 volts 100 Percussion Drills 110 Drill Head 120 Cleaning Swivel 130 Mast 140 Main Unit

Claims

1. A wrench that is attached to the body of a percussion drill and clamps the inner rod of a double-tube rod used for drilling, A rod wrench that engages with the notch of the inner rod to perform the clamping, Mounting means for attaching the rod spanner to the main body, A hydraulic sliding spanner for a percussion drill, characterized by comprising a hydraulic drive means for reciprocating the rod spanner in the biting direction.

2. The mounting means comprises a support table attached to the main body along a direction intersecting the inner rod, and a slide bracket to which the rod spanner is attached and which is slidably mounted on the support table. The hydraulic sliding spanner for a percussion drill according to claim 1, characterized in that the hydraulic drive means reciprocates the slide bracket.

3. The mounting means comprises a spanner cover attached to the main body along a direction intersecting the inner rod, and a slide table to which the rod spanner is attached and which is reciprocally movable in a direction intersecting the inner rod. The hydraulic sliding spanner for a percussion drill according to claim 1, characterized in that the hydraulic drive means moves the sliding table back and forth.

4. The hydraulic sliding spanner for a percussion drill according to claim 2, characterized in that the hydraulic drive means is a hydraulic cylinder attached to the mounting means and extends and retracts along a direction intersecting the inner rod.

5. The hydraulic sliding spanner for a percussion drill according to claim 3, characterized in that the hydraulic drive means comprises a rack gear provided on the mounting means so as to extend in a direction intersecting the inner rod, a pinion gear meshed with the rack gear, and an oil motor attached to the mounting means for rotating the pinion gear in forward and reverse directions.

6. The hydraulic slide spanner for a percussion drill according to claim 1, characterized in that a stopper is provided on the mounting means to restrict the movement of the rod spanner in the opposite direction.

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