JP3147991U - Drilling machine - Google Patents

Abstract

Provided is a drilling machine capable of forming a through hole with high accuracy without cracking or chipping. In a hole drilling machine, a pair of arms 16 and 24, which rotatably support bits 32 and 50 on the lower end side, are reciprocated along an upper frame 12 by feeding mechanisms 18 and 26. When the bits 32 and 50 are simultaneously processed from both sides of the side wall 92, the approach of the bit 50 by the feed mechanism 26 is stopped by the contact between the locking piece 80 of the upper frame 12 and the bolt head 82A inside the arm 24. Meanwhile, the approaching operation of the bit 32 by the other feeding mechanism 18 continues, and the bolts 72 on the inner side of the arms 16 and 24 and the projecting member 74 come into contact when the tips of the bits reach a predetermined interval. For this reason, the bits 32 and 50 are moved slowly in the same direction by the feeding mechanism 18 having a higher thrust while maintaining a predetermined interval, and pass through the uncut portion to form a through-hole having no chipping or cracking. . [Selection] Figure 1

Description

  The present invention relates to a drilling machine for making a through hole in concrete such as a hand hole.

A hand hole buried in the ground for cable connection work and connection portion protection is a box-like shape made of concrete, and a through hole is formed through which cables are passed. A conventional drilling machine (or drilling machine) uses a bit 102 having a tip 102A provided with a diamond tip or the like, for example, as shown in FIG. 5A. The rotating shaft 104 of the bit 102 is rotatably supported by an arm 106, and is driven to rotate by a motor (not shown) via a belt 108, thereby punching a concrete wall 100 such as a hand hole. Further, the example shown in FIG. 5B is processed in the same manner as the example shown in FIG. 5A except that the core 122 remains inside the bit 120.
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  However, the background art as described above has the following disadvantages. First, in the case of the example shown in FIG. 5 (A), when the bit 102 is advanced halfway, the feed rate is decreased (the number of revolutions is increased) and the processing is performed slowly. It cannot withstand the pressure, and cracks 110 and the like enter and break. In the case of the example shown in FIG. 5B, the impact when the tip 120A of the bit 120 vibrates between the core 122 remaining inside the bit 120 and the surrounding concrete wall 100 or the core 122 is taken out. May cause cracks 124 or cracks or chips. Since the above-mentioned hand hole requires a highly accurate hole, a drilling machine capable of forming a through hole without a crack or chip at the edge is desired.

  The present invention pays attention to the above points, and an object of the present invention is to provide a drilling machine capable of forming a through hole with high accuracy without cracking or chipping.

  In order to achieve the above object, the present invention provides a drilling machine for forming a through-hole in a workpiece, and is supported substantially horizontally above the workpiece and can be moved up and down, and a rotary shaft. Are opposed to each other with the object to be processed so as to be on the same axis, and a pair of bits whose diameters of the processed parts are substantially the same, and the bits are rotatably supported on the lower end side, and are attached to the upper frame. A pair of arms capable of reciprocating along, a pair of feed mechanisms for reciprocatingly driving the pair of arms with different thrusts, a pair of rotational driving mechanisms for independently rotating the pair of bits, and the pair of arms A pair of projecting members projecting inwardly from the pair, and when the tips of the pair of bits approach until reaching a predetermined distance, the pair of projecting members come into contact with each other and the distance between the pair of bits First stopper mechanism for maintaining, and further comprising a.

  Another device is a drilling machine for forming a through hole in a processing target, and is supported substantially horizontally above the processing target, and an upper frame that can be moved up and down and a rotating shaft are on the same axis. As described above, a pair of bits whose processing parts have substantially the same diameter are supported on both sides of the processing target, and the bits are rotatably supported on the lower end side, and can be reciprocated along the upper frame. A pair of arms, a pair of feed mechanisms for reciprocatingly driving the pair of arms with different thrusts, a pair of rotational drive mechanisms for independently rotating the pair of bits, and a pair protruding inward from the pair of arms A pair of projecting members, and when the tips of the pair of bits approach each other until a predetermined distance is reached, the pair of projecting members come into contact with each other to maintain a distance between the pair of bits. Mechanism, before the front end of the pair of bit reaches the predetermined distance, the second stopper mechanism for stopping the approach movement thrust by lower feed mechanism, characterized by comprising a. One of the main forms is that the second stopper mechanism is fixed to the projecting member fixed to the inner side of the arm driven by the feed mechanism having the lower thrust, and fixed to the upper frame. And a locking piece that locks. The above and other objects, features, and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  In the present invention, a pair of bits opposed to each other on the same axis are brought close to each other with different thrusts, and the propulsion force of the feed mechanism having the higher thrust is utilized while maintaining the proximity state by the first stopper mechanism. The bit is moved in the same direction, or the second stopper mechanism stops the approaching operation of the bit by the feeding mechanism with the lower thrust at a predetermined position, and then the bit approaching by the feeding mechanism with the higher thrust is performed. The operation is continued, and further, the first stopper mechanism keeps the tips of the pair of bits close to each other with a predetermined interval. And since it decided to move a pair of bits in the same direction using the propulsive force of the feed mechanism with the higher thrust while maintaining the proximity state with the first stopper mechanism, the accuracy without cracking or chipping The effect that a through hole having a high height can be formed is obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the overall configuration of the drilling machine of the present embodiment, and FIGS. 2 to 4 are front views of main parts showing the operation of the present embodiment. The hole drilling machine 10 of the present embodiment is for forming a through hole in a side wall 92 of a concrete hand hole 90. As shown in FIG. 1, the hole drilling machine 10 is supported by a support member and an elevating mechanism (not shown) so that the upper frame 12 can be moved up and down and in a substantially horizontal state, and a rail provided on the upper frame 12. 14, a pair of arms 16 and 24 can be driven back and forth in the direction indicated by arrow F1 in FIG. These arms 16 and 24 are driven by feed mechanisms 18 and 26.

The feed mechanism 18 uses a hydraulic cylinder in the present embodiment, and includes a shaft 20 fixed along the upper frame 12 and a cylinder 22 reciprocating along the shaft 20. Is fixed above the arm 16 by fixing means (not shown), so that the arm 16 can be reciprocated by the feeding mechanism 18. Similarly, the other feed mechanism 26 includes a shaft 28 and a cylinder 30 reciprocating along the shaft 28, and the cylinder 30 is fixed above the arm 24. The feed mechanisms 18 and 24 are set to have different thrusts. In this embodiment, the feed mechanism 18 for driving the right arm 16 has a thrust of the feed mechanism 26 for driving the left arm 24. Is set to be higher. For example, the pressure of the hydraulic cylinder of the feed mechanism 18 is set to 5 kg / cm ² , and the pressure of the hydraulic cylinder of the feed mechanism 26 is set to 3 kg / cm ² .

  Bits 32 and 50 for forming a through hole in the side wall 92 are provided on the lower ends of the pair of arms 16 and 24. The bit 32 is disposed such that the axial direction of the rotating shaft 34 coincides with the extending direction of the upper frame 12, and the rotating shaft 34 is rotatably supported on the lower end side of the arm 16. A belt wheel 34 </ b> A is provided at an end portion penetrating 16. Similarly, the other bit 50 is disposed so that the axial direction of the rotating shaft 52 coincides with the extending direction of the upper frame 12, and the rotating shaft 52 can rotate to the lower end side of the arm 24. A belt wheel 52 </ b> A is provided at an end that penetrates the arm 24. That is, the pair of bits 32 and 50 are disposed opposite to each other on the same axis.

  Further, motors 40 and 58 for rotating the bits 32 and 50 are fixed above the pair of arms 16 and 24 via fixing bases 36 and 54 and fixing members 38 and 56, respectively. A belt wheel 44 is provided at the end of the rotating shaft (not shown) of the motor 40, and a belt 46 is wound around the belt wheel 34A at the end of the rotating shaft 34 of the bit 32. The output of the motor 40 can be transmitted to the rotating shaft 34 of the bit 32 for rotation. Similarly, a belt wheel 60 is provided at the end of the rotating shaft (not shown) of the other motor 56, and the belt 62 is interposed between the belt wheel 52A at the end of the rotating shaft 52 of the bit 50. By wrapping around, the output of the motor 58 can be transmitted to the rotating shaft 52 of the bit 50 and rotated.

  Next, a stopper mechanism for preventing the bits 32 and 50 from approaching a predetermined interval will be described. In this embodiment, two stopper mechanisms are used, and the first stopper mechanism is provided at the projecting members 70 and 74 provided inside the pair of arms 16 and 24 and at the tip of the projecting member 70. It is constituted by a bolt 72. In the first stopper mechanism, when the arms 16 and 24 are moved to bring the bits 32 and 50 close to each other, the head 72A of the bolt 72 contacts the tip of the protruding member 74 as shown in FIG. Then, the tips of the bits 32 and 50 are maintained so as not to approach more than a predetermined distance α (for example, about 1 mm). The contact between the projecting member 74 and the bolt head 72A is maintained while driving in the direction of the arrow F1a by the feed mechanism 18 having a high thrust is continued. In other words, the first stopper mechanism allows the feed mechanism 18 with higher thrust to move in the same direction (arrow F1a direction) while maintaining the proximity of the bits 32 and 50.

  On the other hand, in the second stopper mechanism, before the tips of the pair of bits 32 and 50 reach the predetermined distance α, the second stopper mechanism moves toward the arrow F1b by the feeding mechanism 26 having a lower thrust. ). In this embodiment, a bolt 82 provided above the arm 24 driven by the feed mechanism 26 and a latch provided on the lower end side of the upper frame 12 and in contact with the head 82A of the bolt 82. A piece 80 is used. As shown in FIG. 3A, the position of the locking piece 80 contacts the head portion 82A of the bolt 82 before the bolt head portion 72A of the first stopper mechanism and the protruding member 74 contact each other. Set to position. The second stopper mechanism reliably stops the approaching operation of the arm 24 having the lower thrust and stops the arm 24 first by the arm 16 having the higher thrust via the first stopper mechanism. Reduces impact when pushed back in the direction of arrow F1a. In addition, when pushed back in the direction of the arrow F1a, the locking piece 80 and the bolt head 82A are separated.

  Next, the operation of this embodiment will be described. First, as shown in FIG. 1, the position of the hole drilling machine 10 is adjusted by a lifting mechanism (not shown) so that one arm 16 is inside the hand hole 90 and the other arm 24 is outside the hand hole 90. To do. Next, the motors 40 and 58 are turned on to start the rotation of the bits 32 and 50, and the arm 16 (bit 32) is moved to the arrow by the feed mechanisms 18 and 26 as shown in FIG. The arm 24 (bit 50) starts to be fed in the direction of arrow F1b in the direction F1a. When the bits 32 and 50 approach each other, as shown in FIG. 2 (B), drilling is performed from the inside and outside of the side wall 92 of the hand hole 90. Subsequently, when the bits 32 and 50 are brought close to each other, first, as shown in FIG. 3A, the locking piece 80 of the second stopper mechanism and the bolt head 82A come into contact with each other, and the feed mechanism 26 with the lower thrust is used. The approaching operation of the bit 50 stops.

  While the approaching operation of the bit 50 is stopped, the bit 32 by the feeding mechanism 18 having a higher thrust continues to approach in the direction of the arrow F1a, and the tip of the bits 32 and 50 has a predetermined distance. When the distance α is reached, as shown in FIG. 3B, the protruding member 74 of the first stopper mechanism and the bolt head 72A come into contact with each other, and the distance α is maintained between the tips of the bits 32 and 50. . In this embodiment, as described above, one feed mechanism 18 has a larger thrust than the other feed mechanism 26, and the projecting member 74 of the first stopper mechanism and the bolt head 72A are in contact with each other. The arm 24 and the bit 50 connected to the low feed mechanism 26 are pushed back in the direction of the arrow F1a by the high thrust feed mechanism 18. That is, the bits 32 and 50 start to move in the direction of the arrow F1a as shown in FIG. 4A while maintaining the distance α, and the contact between the locking piece 80 of the second stopper mechanism and the bolt head 82A is released. Is done. Then, since the bit 32 passes slowly through the portion left uncut in the state of FIG. 3B as shown in FIG. 4A, it is connected to the hole formed by the bit 50 without causing chipping or cracking. .

  When the holes are completely connected, as shown in FIG. 4B, the arm 16 and the bit 32 are returned in the direction of the arrow F1b by the feeding mechanism 18, and the arm 24 and the bit 50 are returned in the direction of the arrow F1a by the feeding mechanism 26. Then, when the core 96 is extracted, a highly accurate through hole 94 is formed in the side wall 92 of the hand hole 90.

Thus, according to the first embodiment, there are the following effects.
(1) A pair of bits 32 and 50 arranged opposite to each other with a side wall 92 on the same axis are brought close to each other with different thrusts, and a first gap between the tips of the pair of bits 32 and 50 is set at a predetermined interval. Maintain so as to maintain α. And since it decided to move a pair of bit to the same direction using the feed mechanism 18 with higher thrust, maintaining a proximity state, the through-hole 94 with a high precision without a crack and a chip | tip can be formed.
(2) Since the second stopper mechanism is provided in addition to the first stopper mechanism, the feed mechanism 26 having the lower thrust before the tips of the pair of bits 32 and 50 reach the predetermined interval α. It is possible to reliably stop the approaching operation and to reduce the impact at the time of contact between the projecting member 74 of the first stopper mechanism and the bolt head 72A.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes and dimensions shown in the above embodiments are merely examples, and may be changed as appropriate.
(2) The material is also an example, and in the above-described embodiment, the diamond tip is provided at the tip of the bits 32 and 50. However, the present invention is not limited to this, and various known cutting tips may be used. The provided bit may be used.
(3) In the above embodiment, hydraulic cylinders are used as the feed mechanisms 18 and 26, but various known feed mechanisms can be applied as long as they have the same effect.
(4) The fixed positions of the motors 40 and 58 and the mechanism for transmitting the output to the bits 32 and 50 are examples, and the design may be changed as appropriate so as to achieve the same effect.
(5) The first and second stopper mechanisms are also examples, and the design may be changed to achieve the same effect. The second stopper mechanism may be provided as necessary.
(6) The pressure of the hydraulic cylinder shown in the above embodiment is also an example, and may be changed as appropriate.
(7) In the above embodiment, the case where the through hole 94 is formed in the side wall 92 of the concrete handhole 90 has been described as an example. However, this is also an example, and the present invention is applied to various known processing objects in general. Applicable.

  According to the present invention, a pair of bits opposed to each other on the same axis are brought close to each other with different thrusts, and the propulsive force of the feed mechanism having the higher thrust is utilized while maintaining the proximity state with the first stopper mechanism. The pair of bits are moved in the same direction, or the second stopper mechanism stops the approaching operation of the bit with the lower thrusting mechanism at a predetermined position and then the bit with the higher thrusting mechanism. Further, the first stopper mechanism keeps the tips of the pair of bits close to each other with a predetermined interval. The pair of bits are moved in the same direction using the propulsive force of the feed mechanism having the higher thrust while maintaining the proximity state with the first stopper mechanism. Applicable to the use of drilling machines. In particular, since it is possible to form a through-hole with high accuracy without cracks or chips, it is suitable for forming a through-hole in a hand hole.

It is a front view which shows the whole structure of Example 1 of this invention. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows the effect | action of the said Example 1. FIG. It is a figure which shows an example of background art.

Explanation of symbols

10: Drilling machine 12: Upper frame 14: Rail 16, 24: Arm 18, 26: Feed mechanism 20, 28: Shaft 22, 30: Cylinder 32, 50: Bit 34, 52: Rotating shaft 34A, 52A: Belt wheel 36, 54: Fixing base 38, 56: Fixing tool 40, 58: Motor 44, 60: Belt wheel 46, 62: Belt 70, 74: Protruding member 72, 82: Bolt 72A, 82A: Head 80: Locking piece 90: Hand hole 92: Side wall 94: Through hole 96: Core 100: Concrete wall 102, 120: Bit 102A, 120A: Tip 104: Rotating shaft 106: Arm 108: Belt 110, 124: Crack 122: Core

Claims (3)

A drilling machine for forming a through hole in a processing object,
An upper frame that is supported substantially horizontally above the workpiece and that can be raised and lowered;
A pair of bits that are opposed to each other with the processing object sandwiched so that the rotation axes are on the same axis, and the diameters of the processing parts are substantially the same;
A pair of arms rotatably supporting the bit on the lower end side and capable of reciprocating along the upper frame;
A pair of feed mechanisms for reciprocally driving the pair of arms with different thrusts;
A pair of rotational drive mechanisms for independently rotating the pair of bits;
A pair of projecting members projecting inwardly from the pair of arms, and the pair of projecting members come into contact with each other when the tips of the pair of bits approach until reaching a predetermined interval; A first stopper mechanism for maintaining an interval between
A drilling machine characterized by comprising: A drilling machine for forming a through hole in a processing object,
An upper frame that is supported substantially horizontally above the workpiece and that can be raised and lowered;
A pair of bits that are opposed to each other with the processing object sandwiched so that the rotation axes are on the same axis, and the diameters of the processing parts are substantially the same;
A pair of arms that rotatably support the bit on the lower end side and that can be driven back and forth along the upper frame;
A pair of feed mechanisms for reciprocally driving the pair of arms with different thrusts;
A pair of rotational drive mechanisms for independently rotating the pair of bits;
A pair of projecting members projecting inwardly from the pair of arms, and the pair of projecting members come into contact with each other when the tips of the pair of bits approach until reaching a predetermined interval; A first stopper mechanism for maintaining an interval between
A second stopper mechanism for stopping an approaching operation by a feed mechanism having a lower thrust before the tips of the pair of bits reach the predetermined interval;
A drilling machine characterized by comprising: The second stopper mechanism is
A projecting member fixed to the inside of the arm driven by the feed mechanism having the lower thrust,
A locking piece fixed to the upper frame and locking the protruding member;
The drilling machine according to claim 2, comprising:

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