Rock bolt installation device

Abstract

To provide a rock bolt driving device capable of stably clamping a rock bolt regardless of a driving attitude.SOLUTION: A rock bolt driving device 100 comprises: a driving machine 160 movably provided on a guide shell 150 and driving a rock bolt B along a driving axis; and a clamping mechanism 200 provided at a position of a front portion of the driving machine 160 so as to be movable integrally with the driving machine 160 and capable of holding and releasing the rock bolt B. In particular, the clamping mechanism 200 has: a guide portion 210 having a guide hole 211 for axially guiding the rock bolt B at the front portion of the driving machine 160; and a clamp portion 220 configured to move the guide portion 210 in a radial direction of the rock bolt B and capable of holding the rock bolt B by pressing an inner surface of the guide hole 211 from the side thereof.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rock bolt driving device.

Background Art

[0002] In order to stabilize the ground, rock bolts are driven by a rock bolt driving device (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional rock bolt driving devices include a clamping device that clamps a point in the middle of the rock bolt. During driving, in order to slide the rock bolt along the axial direction, the clamping state by the clamping device is set to "loose bite" for sliding movement.

[0005] However, when the rock bolt is in a "loose bite" state, if it is used in a posture with the axis of the rock bolt driving device facing downward, the rock bolt may fall due to its own weight. This is because it is difficult to set the clamping force that supports the "loose bite" to such an extent that the rock bolt does not fall and sliding movement is possible.

[0006] Therefore, the present invention has been made by paying attention to such problems, and an object thereof is to provide a rock bolt driving device that can stably clamp a rock bolt regardless of the driving posture, and a rock bolt driving work vehicle equipped with the same.

Means for Solving the Problems

[0007] To solve the above problems, a rock bolt driving device according to one aspect of the present invention is characterized by comprising: a driving machine that is movably mounted on a guide shell and drives rock bolts along the driving axis; and a clamping mechanism that is movably mounted integrally with the driving machine at a position in front of the driving machine and capable of holding and releasing the rock bolts.

[0008] Herein, in a lock bolt clamping device according to one aspect of the present invention, the clamping mechanism includes a guide portion having a guide hole formed through the lock bolt in the axial direction so as to guide the lock bolt in the axial direction at the front of the driving machine, and a clamp portion configured to move the guide portion in the radial direction of the lock bolt, wherein the clamp portion preferably holds the lock bolt by pressing the inner surface of the guide hole against the lock bolt from the side. Furthermore, in a lock bolt clamping device according to one aspect of the present invention, it is preferable that the guide portion further has a frustoconical guide surface on the front side of the guide hole that expands in diameter from the rear axial direction toward the front.

[0009] Furthermore, in order to solve the above problems, a rock bolt installation vehicle according to one aspect of the present invention is characterized in that it is equipped with a rock bolt installation device according to one aspect of the present invention. [Effects of the Invention]

[0010] According to the present invention, the rock bolt can be stably clamped regardless of the casting position. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram illustrating one embodiment of a work vehicle such as a hydraulic excavator equipped with a rock bolt driving device according to one aspect of the present invention on its arm. Figure (a) is a front view thereof, illustrating multiple positions in which the rock bolt driving device is rotated, and Figure (b) is a side view, illustrating the positions in which the arm is raised and lowered, as well as the axis of the rock bolt driving device being horizontal and vertical. [Figure 2] This is a schematic diagram illustrating one embodiment of a rock bolt driving device according to one aspect of the present invention, where (a) is a plan view, (b) is a side view, and (c) is a rear view seen from the rear of the driving machine. [Figure 3] This is a schematic diagram illustrating one embodiment of a clamping mechanism located at the front of the shank rod of the concrete casting machine in Figure 2(b). [Figure 4] Figure 3 is a schematic diagram illustrating the operation of the clamping mechanism. Figure (a) shows the open state where the lock bolt is not gripped, and Figure (b) shows the gripped state where the lock bolt is gripped. [Modes for carrying out the invention]

[0012] The following describes one embodiment of the present invention, with reference to the drawings as appropriate. Note that the drawings are schematic. Therefore, it should be noted that the relationship and ratios between thickness and planar dimensions may differ from those of reality, and there may be differences in dimensional relationships and ratios between drawings. Furthermore, the embodiments described below illustrate devices and methods for realizing the technical concept of the present invention, and the technical concept of the present invention is not limited to the following embodiments in terms of the material, shape, structure, arrangement, etc., of the components.

[0013] As shown in Figure 1, the work vehicle 300 of this embodiment comprises a traveling carriage 310, a slewing platform 320 that can rotate on the traveling carriage 310, an arm 340 that is supported on the slewing platform 320 so as to be able to move up and down, and a lock bolt driving device 100 equipped at the tip of the arm 340. On the slewing platform 320, an operator cabin 330 is positioned to the left of the arm 340 in a plan view.

[0014] As shown in Figure 2, the lock bolt installation device 100 includes a mounting bracket 110 attached to the tip of the arm 340, and a rotating bracket 130 positioned relative to the mounting bracket 110 via a rotary actuator 120. In this embodiment, a guide shell 150 is mounted on the side of the rotating bracket 130 via a guide slide mechanism 140, and the guide shell 150 itself can slide within a predetermined range by the extension and retraction operation of the cylinder 141 of the guide slide mechanism 140.

[0015] The rotating bracket 130 allows the guide shell 150 on the rotating bracket 130 to rotate within a predetermined range (a range of 90 degrees from a vertical position to a horizontal position in the example shown in Figure 1(a)) in response to the rotation of the rotary actuator 120. The guide shell 150 is equipped with necessary equipment such as a centralizer, and a hydraulically driven concrete pouring machine 160 is mounted on it so as to be able to slide along the guide shell 150. A feed mechanism for sliding the concrete pouring machine 160 can be a chain mechanism driven by a hydraulic motor or a wire rope mechanism driven by a hydraulic cylinder.

[0016] In this embodiment, the guide shell 150 is equipped with a magazine 180 to which a pair of bolt carriages 170 are attached along the guide shell 150. The magazine 180 stores a plurality of lock bolts B, and the lock bolts B stored in the magazine 180 can be transferred to the driving axis of the driving machine 160 by a transfer operation of the pair of bolt carriages 170.

[0017] Furthermore, the guide shell 150 of this embodiment is equipped with a rod clamp swing 190 for receiving the drilling rod R, and the rotational movement of the rod clamp swing 190 allows the drilling rod R to be transferred onto the driving axis of the driving machine 160. Note that a known structure is used for the transfer operation by the bolt carriage 170 and the rod clamp swing 190, so a detailed explanation will be omitted.

[0018] Here, the rock bolt driving device 100 of the present embodiment includes a clamping mechanism 200 for clamping the rear end of the rock bolt B. The clamping mechanism 200 is configured to be able to hold and release the rear end portion of the rock bolt B at a position immediately before the rod housing portion 161 at the front portion of the driving machine 160 (the position of the reference symbol F shown in Fig. 2(b)).

[0019] Specifically, as shown in Fig. 3, the clamping mechanism 200 includes a base 230. The base end portion of the base 230 is fixed to the upper surface of the moving table 162 on which the driving machine 160 is fed and moved, and is integrally movable with the driving machine 160. The upper portion of the base 230 projects forward of the guide shell 150, and its end face is a clamping mechanism mounting surface 231 which is a surface orthogonal to the drilling axis CL. And a clamping portion 220 and a guide portion 210 are mounted on this clamping mechanism mounting surface 231.

[0020] The clamping portion 220 is configured to include a clamping cylinder 221 having a rectangular parallelepiped-shaped cylinder body, and the clamping cylinder 221 is fixed to the clamping mechanism mounting surface 231 with the cylinder rod 222 directed downward. The upper surface of the guide portion 210 is fixed to the tip of the cylinder rod 222, and the guide portion 210 is movable up and down according to the extension and contraction of the cylinder rod 222.

[0021] The guide portion 210 has a guide hole 211 for guiding the rock bolt B along the axial direction at the front portion of the driving machine 160. The guide hole 211 is formed to penetrate along the axial direction of the rock bolt B (and the drilling rod R). On the front side of the guide hole 211, a frustum-shaped guide surface 212 that expands in diameter from the rear in the axial direction toward the front is formed. The guide hole 211 is a cylindrical surface 213 behind the guide surface 212. The guide hole axis GL which is the axis of the guide hole 211 is adjusted to be coaxial with the drilling axis CL when the cylinder rod 222 extends.

[0022] As a result, the clamp portion 220 is configured to allow the guide portion 210 to move radially with respect to the lock bolt B, and can hold the lock bolt B by pressing the cylindrical surface 213 on the inner surface of the guide hole 211 against the lock bolt B from the side. In this embodiment, slide guide plates 223 are provided on the left and right sides of the guide section 210, preventing the guide section 210 from swaying when it is supported in a downward-hanging position, and allowing the guide section 210 to move smoothly up and down.

[0023] Next, the procedure and effects of installing rock bolts using the rock bolt installation device 100 of this embodiment will be described. First, the drilling rod R is transferred to the casting axis of the casting machine 160 by a transfer operation using the rod clamp swing 190, and the lock bolt insertion hole is drilled by the drive and feed operation of the casting machine 160.

[0024] Here, when the drilling rod R is handed over to the concrete casting machine 160, according to the clamp mechanism 200 of this embodiment, a guide part 210 having a guide hole 211 formed through the drilling rod R along its axial direction is positioned at the front of the concrete casting machine 160, so that the drilling rod R can be guided along its axial direction.

[0025] In particular, when clamping the drilling rod R, it is necessary to advance the concrete casting machine 160 along the guide shell 150 and place the rear end of the drilling rod R into the rod housing section 161 of the concrete casting machine 160. However, a long drilling rod R may bend and sag due to its own weight depending on its position, making it difficult to place into the rod housing section 161 of the concrete casting machine 160.

[0026] In contrast, according to the clamping mechanism 200 of this embodiment, the guide portion 210 has a frustoconical guide surface 212 on the front side of the guide hole 211 that expands in diameter from the rear in the axial direction toward the front. Therefore, even if the drilling rod R is curved to some extent, the drilling rod R can be smoothly guided along the axial direction as long as it is within the frustoconical range where the guide surface 212 expands in diameter.

[0027] Next, the drilling rod R is retrieved from the driving axis by the rotational movement of the rod clamp swing 190 and rotated to the retracted position. Then, the lock bolt B stored in the magazine 180 is transferred to the driving axis of the driving machine 160 by the transfer operation of the pair of bolt carriages 170. At this time, the driving machine 160 and the clamp mechanism 200 attached thereto are retracted to the axial rear of the guide shell 150.

[0028] Next, as shown in Figure 4(a), with the cylinder rod 222 of the clamp cylinder 221 of the clamp section 220 extended (at this time, the axis of the guide hole axis GL of the guide hole 211 coincides with the casting axis CL of the casting machine 160), the casting machine 160 is moved forward along the casting axis CL. As a result, the concrete casting machine 160 (and clamping mechanism 200) is advanced along the guide shell 150, and the rear end of the lock bolt B is placed in the rod housing section 161 of the concrete casting machine 160. At this time, the frustoconical hole in the guide surface 212 provided on the front side has the effect of smoothly guiding the rear end of the lock bolt B toward the rod housing section 161 of the concrete casting machine 160.

[0029] Next, as shown in Figure 4(b), the cylinder rod 222 of the clamp cylinder 221 is shortened, and the cylindrical surface 213 of the guide hole 211 is pressed against the rear end of the lock bolt B from a direction perpendicular to the axial direction (from above in the figure). As a result, the rear end of the lock bolt B is clamped in cooperation with the rod housing 161 of the concrete casting machine 160.

[0030] The figure illustrates how the guide hole axis GL, the lock bolt axis BL, and the drilling axis CL work together in a cooperative action where their axes are misaligned and out of sync due to the clamping operation, resulting in the desired clamping effect. In this embodiment, the driving machine 160 is advanced together with the clamping mechanism 200 along the driving axis CL in this clamped state, thereby inserting the lock bolt B along the drilled lock bolt insertion hole.

[0031] As mentioned above, conventional rock bolt installation devices are equipped with a clamping device that clamps a point in the middle of the rock bolt. During installation, the clamping device is kept in a "loose grip" state to allow the rock bolt to slide along the axial direction.

[0032] However, when the lock bolt is only loosely gripped, there is a risk that the lock bolt may fall due to its own weight if the lock bolt installation device is used with its axis facing downwards. This is because it is difficult to set the clamping force to support the lock bolt in a way that is loose enough to prevent it from falling while still allowing it to slide.

[0033] In contrast, the rock bolt installation device 100 of this embodiment is equipped with a clamping mechanism 200 that can move integrally with the installation machine 160 at the position of the rod housing section 161 at the front of the installation machine 160, so that the rear end of the rock bolt B can be stably clamped regardless of the installation position.

[0034] In other words, with the clamping mechanism 200 of this embodiment, the rear end of the lock bolt B can be held and released at the front of the concrete casting machine 160, so the rear end of the lock bolt B can be securely clamped, and concrete can be cast while moving together with the concrete casting machine 160.

[0035] This eliminates the need for the lock bolt B to slide within the clamping mechanism 200 during concrete placement. In other words, since "loose gripping" support is unnecessary, setting the clamping force becomes easier, allowing for stable clamping and concrete placement with the appropriate force.

[0036] However, if the clamp mechanism 200 is positioned at the front of the concrete casting machine 160, as in this embodiment, the pushing length of the lock bolt B will be shortened by the axial space occupied by the clamp mechanism 200, or the overall length of the device will be extended. Therefore, it is desirable to make the clamp mechanism as compact as possible.

[0037] In contrast, according to the clamp mechanism 200 of this embodiment, a guide portion 210 having a guide hole 211 formed through the lock bolt B along its axial direction is arranged at the front of the casting machine 160, so that the lock bolt B can be guided along its axial direction.

[0038] Furthermore, according to the clamping mechanism 200 of this embodiment, the guide portion 210 has a clamp portion 220 configured to be movable in the radial direction of the lock bolt B, and the clamp portion 220 can hold the lock bolt B by pressing the inner surface (cylindrical surface 213) of the guide hole 211 against the lock bolt B from the side.

[0039] This allows the clamping mechanism 200 to occupy a compact axial space. Therefore, the clamping mechanism 200 of this embodiment minimizes the problem of shortened insertion length of the lock bolt B, and also minimizes the increase in the overall length of the device.

[0040] Furthermore, when clamping the rock bolt B, it is necessary to advance the driving machine 160 along the guide shell 150 and place the rear end of the rock bolt B into the rod housing section 161 of the driving machine 160. However, the long rock bolt B may bend and sag due to its own weight depending on its position, making it difficult to place into the rod housing section 161 of the driving machine 160.

[0041] In contrast, the clamping mechanism 200 of this embodiment employs a configuration in which the guide portion 210 has a frustoconical guide surface 212 on the front side of the guide hole 211 that expands in diameter from the rear in the axial direction toward the front. Therefore, even if the lock bolt B is curved to some extent, the lock bolt B can be smoothly guided along the axial direction as long as it is within the frustoconical range where the guide surface 212 expands in diameter.

[0042] As described above, the rock bolt installation device 100 of this embodiment is equipped with a clamping mechanism 200 that can hold and release the rock bolt B at the front position of the installation machine 160, so that the rock bolt B can be stably clamped regardless of the installation position. It should be noted that the rock bolt installation device according to the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. [Explanation of Symbols]

[0043] 100 Rock bolt installation device 110 Mounting Bracket 120 Rotary Actuator 130 Rotating Bracket 140 Guide slide mechanism 141 Cylinder 150 Guide Shells 160 concrete pouring machine 161 Rod housing section 170 Bolt Carriage 180 Magazine 190 Rod Clamp Swing 200 Clamping Mechanism 210 Guide section 211 Guide hole 212 Guide surface 213 Cylindrical surface 220 Clamp section 221 Clamp Cylinder 222 Calcium Rod 223 Slide guide plate 230 base 231 Clamp mechanism mounting surface 300 work vehicles 310 Bogie 320 Turntable 330 Operator Cabin 340 Arm B Lock bolt R Drilling Rod CL Drilling axis BL Lock Bolt Axis GL guide hole axis

Claims

1. A driving machine that is movably mounted on a guide shell and drives rock bolts along the driving axis, The system includes a clamping mechanism that is provided at the front of the casting machine so as to be movable integrally with the casting machine and capable of holding and releasing the lock bolt, The aforementioned casting machine is equipped with a rod housing section that accommodates the rear end of the rock bolt in a loosely fitted state, The clamping mechanism is The front of the aforementioned driving machine has a guide portion having a guide hole formed through the axial direction of the lock bolt so that the lock bolt can be guided along the axial direction, The guide portion has a clamp portion configured to be movable in the radial direction of the lock bolt, The clamp portion is a lock bolt installation device that holds the lock bolt by pressing the inner surface of the guide hole against the lock bolt from the side.

2. The rock bolt driving device according to claim 1, wherein the guide portion further has a frustoconical guide surface on the front side of the guide hole that expands in diameter from the rear in the axial direction toward the front.

3. A work vehicle characterized by being equipped with a rock bolt driving device according to claim 1 or claim 2.

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