Assembly Structure of Crushing Mechanism in Rock-Cutting Packer

Abstract

To provide an assembly structure for a crushing mechanism in a stone cracking packer that can connect and fix a single engagement part in all members by using a tightening and fixing pin as a final work process, by combining engagement irregularities of component members without using any connection fixing members such as screws in an assembly of the crushing mechanism.SOLUTION: An assembly structure for a crushing mechanism in a stone cracking packer is configured to be assembled by a hollow tip outer cylinder having engagement irregularities formed on an inner peripheral surface, a front plate having engagement irregularities formed on an outer peripheral surface that can be engaged with the engagement irregularities within the tip outer cylinder, and a positioning liner having positioning irregularities formed on an outer peripheral surface that are stored within the tip outer cylinder in close contact with the front plate and can engage with the inner peripheral surface of the tip outer cylinder and the respective engagement irregularities of the front plate. A spring that closes and energizes a vane is inserted through a spring hole in an opposite side of a peripheral wall of the tip outer cylinder, and a fixing pin that presses and fixes a spring base is attached to and engaged freely with the spring hole.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an assembly structure of a crushing mechanism in a stone-breaking packer that can easily assemble the crushing mechanism of the stone-breaking packer by assembling the concave and convex shapes of the members without using any connecting and fixing members such as screws.

Background Art

[0002] Conventionally, in one structural form of the crushing mechanism of a stone-breaking packer, two opposed expandable blade bodies are inserted into a drilled hole in a rock, and a tapered arrow body is press-fitted between the expandable blade bodies to expand the blade bodies, thereby generating a wedging action at the drilling position to crush the rock. In this way, the arrow body press-fitted between the blade bodies of the stone-breaking packer is configured to operate in connection with a hydraulic cylinder.

[0003] The crushing mechanism for holding the blade bodies and arrow bodies for crushing the rock is, at the same time, the part for holding the blade bodies and arrow bodies, and is also loaded with a high reaction force associated with the expanding operation, so pressure resistance and rigidity are required.

[0004] In general, the crushing mechanism of a stone-breaking packer that requires such pressure resistance and rigidity is widely popular and is assembled by a plurality of frame members such as pressing plates and side plates, and fastening members such as a plurality of bolts and screws for connecting the frame members to each other (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, since the above-described conventional crushing mechanism is assembled through a number of assembly procedures using a variety of and multiple continuously provided fixing members such as frame members and fastening members, the structure becomes complicated, the overall weight increases, and it affects the assembly workability. In addition, since the assembly work becomes complicated, it also affects the price of the stone cutter packer, and as a result, there is a risk of affecting the popularization of the stone cutter packer of the crushing mechanism.

[0007] In this invention, a combination of engaging concave and convex portions of constituent members is performed without using any connecting and fixing members such as frame members and fastening members in the assembly of the crushing mechanism, and then, as the final working process, a fastening fixing pin is used to connect and fix one engaging portion in all members, thereby providing an assembly structure of a crushing mechanism in a stone cutter packer that can smoothly solve the conventional problems.

Means for Solving the Problems

[0008] In order to solve the above-mentioned conventional problems, in the assembly structure of the crushing mechanism in the rock-breaking packer according to the present invention, (1) a crushing mechanism composed of a blade body and an arrow body is housed in a cylindrical crushing mechanism case. The blade body is configured to be insertable into a rock during drilling and expandable by a pair of opposed blade units, and the arrow body is composed of a tapered rod body continuously provided to be able to advance and retreat to an actuator provided behind the crushing mechanism case. In the rock-breaking packer configured to expand the blade body by pressing the arrow body between the pair of blade units and crush the rock at the drilling position, the crushing mechanism in the crushing mechanism case includes, at the tip of the crushing mechanism case, a hollow tip outer cylinder body having engaging concave and convex portions formed on the inner peripheral surface, a front plate disposed inside the tip outer cylinder body and having engaging concave and convex portions formed on the outer peripheral surface that can engage with the engaging concave and convex portions, and a positioning liner disposed inside the tip outer cylinder body in close contact with the front plate and having positioning concave and convex portions formed on the outer peripheral surface that can engage with the engaging concave and convex portions of the tip outer cylinder body and the engaging concave and convex portions of the front plate, and is configured to be more assemblable. Moreover, the tip outer cylinder body, the front plate, and the positioning liner form an insertion hole through which the blade body and the arrow body are inserted at the central portion. Further, a pair of spring holes for inserting a spring for biasing and closing the expandable blade body are formed in the opposing portions of the peripheral wall of the tip outer cylinder body, and a pair of fixing pins for pressing and fixing the bases of the springs respectively inserted into the pair of spring holes are detachably mounted on the opposing portions of the peripheral wall.

[0009] Moreover, the assembly structure of the crushing mechanism in the rock-breaking packer according to the present invention is characterized by the following points (2) to (4). (2) A pair of positioning plates mounted from the outer peripheral side to the opposing portions of the peripheral wall of the tip outer cylinder body are provided. The positioning plates have a spring hole communicating with the spring hole of the tip outer cylinder body and a positioning protrusion engaging with the outer peripheral side of the positioning liner disposed inside the tip outer cylinder body. The tip outer cylinder body is provided with an insertion hole through which the positioning protrusion passes. (3) It is inserted inside the tip outer cylinder body, has a projectile insertion hole that communicates with the insertion holes of the tip outer cylinder body, the front plate, and the positioning liner to insert the projectile, and is provided with a back plate that guides the advancement of the projectile. (4) The tip end portion of the actuator and the base end portion of the projectile have a clevis structure in which they are male-female fitted to each other and connected by a clevis pin, and a pin insertion port for inserting the clevis pin is opened in the peripheral wall portion of the crushing mechanism case.

Advantages of the Invention

[0010] According to the present invention, a crushing mechanism composed of a blade body and an arrow body is housed in a cylindrical crushing mechanism case. The blade body is configured to be insertable into a rock during drilling and expandable with a pair of opposed blade units. The arrow body is composed of a tapered rod body that is connected to an actuator provided at the rear of the crushing mechanism case so as to be able to advance and retreat. By press-fitting the arrow body between the pair of blade units, the blade body is expanded to crush the rock at the drilling position. In the stone cutter packer configured as described above, the crushing mechanism in the crushing mechanism case includes, at the tip of the crushing mechanism case, a hollow tip outer cylinder having engaging concave and convex portions formed on its inner peripheral surface, a front plate disposed inside the tip outer cylinder and having engaging concave and convex portions formed on its outer peripheral surface that can engage with the engaging concave and convex portions, and a positioning liner disposed inside the tip outer cylinder in close contact with the front plate and having positioning concave and convex portions formed on its outer peripheral surface that can engage with the engaging concave and convex portions of the tip outer cylinder and the engaging concave and convex portions of the front plate. The tip outer cylinder, the front plate, and the positioning liner are configured to be more assemblable. Moreover, the tip outer cylinder, the front plate, and the positioning liner form an insertion hole through which the blade body and the arrow body are inserted at the center. Further, a pair of spring holes for inserting a spring for biasing and closing the expandable blade body are formed in the opposing portions of the peripheral wall of the tip outer cylinder, and a pair of fixing pins for pressing and fixing the bases of the springs respectively inserted into the pair of spring holes are detachably mounted on the opposing portions of the peripheral wall. Therefore, the structure of the crushing mechanism is simplified, and the assembly of the crushing mechanism can be easily performed only by combining the engaging concave and convex portions of the component members without using any connecting and fixing members. The assembly work of the crushing mechanism having such a configuration can be easily performed in the following procedure.

[0011] First, the blade body and the front plate are combined and housed and arranged in the tip outer cylinder at the tip of the crushing mechanism case. Next, the positioning liner is inserted and fitted into the tip outer cylinder. At this time, the positioning concave and convex portions of the positioning liner are fitted into the engaging concave and convex portions of the tip outer cylinder and the engaging concave and convex portions of the front plate. Thereby, the movement in the circumferential direction of the front plate and the positioning liner in the tip outer cylinder is restricted.

[0012] Next, a fixing pin that presses the spring inserted into the spring hole in the circumferential wall facing portion of the tip outer cylinder against the base of the blade body and presses and fixes the spring base is engaged with the spring hole of the tip outer cylinder. That is, finally, by simply using the fixing pin, one engagement portion in all the members is connected and fixed. Thereby, the axial movement of the front plate and the positioning liner within the tip outer cylinder is restricted.

[0013] Through the above assembly operations, the blade body is constantly biased in the closing direction by the spring, and is capable of expanding and closing operations along with the advancing and retracting operations of the projectile body, and is held by the tip outer cylinder at the base. Further, the projectile body is sandwiched between a pair of single blades constituting the blade body, and is capable of advancing and retracting from the crushing mechanism case, and is held by the crushing mechanism case.

[0014] Thus, in the assembly structure of the crushing mechanism of the present invention, unlike the conventional stone cutter packer, without using various continuous fixing members such as frame members and fastening members for holding the blade body and the projectile body, or separating and assembling the actuator and the crushing mechanism case, the blade body and the projectile body can be mounted inside the crushing mechanism case from the tip opening of the crushing mechanism case.

[0015] That is, by simply inserting and engaging the tip outer cylinder, the front liner, and the positioning liner with each other without complicating the structure and without requiring special skills from the operator, the relative positioning of the blade body and the projectile body with respect to the crushing mechanism case can be easily achieved, and after the assembly operation, the blade body and the projectile body can be stably and firmly held at the predetermined positions of the crushing mechanism case.

[0016] Therefore, even if member damage occurs due to wear or buckling of the blade body and the projectile body due to repeated use, anyone can easily and quickly perform the assembly operation of replacing them with new blade bodies and projectile bodies, which has the effect of dramatically improving the working efficiency. Furthermore, when using the stone cutter packer, it has the effect of stabilizing the reproducibility of the operation for correctly generating the wedging action each time and stabilizing the stone cutting function as an original packer.

[0017] Also, inside the tip outer cylinder at the tip of the crushing mechanism case, since the front liner and the positioning liner are densely arranged around the base of the blade body, the front liner and the positioning liner receive the expanding pressure action applied to the crushing mechanism case due to the expanding and closing actions of the arrow blades accompanying the advancing or retreating movement of the central arrow body, and it is possible to prevent the crushing mechanism case from suffering buckling damage. Therefore, there is an effect that the device life of the packer can be extended.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

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Figure 11

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Figure 13

Figure 14

Mode for Carrying Out the Invention

[0019] The gist of this invention is to house a crushing mechanism composed of a blade body and an arrow body in a cylindrical crushing mechanism case. The blade body is configured to be insertable into a drilled hole in a rock and expandable with a pair of opposed blade units. The arrow body is composed of a tapered rod body that is connected to an actuator provided at the rear of the crushing mechanism case so as to be able to advance and retreat. By press-fitting the arrow body between the pair of blade units, the blade body is expanded to crush the rock at the drilling position. In the rock-splitting packer configured in this way, the crushing mechanism in the crushing mechanism case includes, at the tip of the crushing mechanism case, a hollow tip outer cylinder body having engaging concave and convex portions formed on its inner peripheral surface, a front plate disposed inside the tip outer cylinder body and having engaging concave and convex portions that can engage with the engaging concave and convex portions formed on its outer peripheral surface, and a positioning liner disposed inside the tip outer cylinder body in close contact with the front plate and having positioning concave and convex portions that can engage with the engaging concave and convex portions of the tip outer cylinder body and the engaging concave and convex portions of the front plate formed on its outer peripheral surface, and is configured to be more assemblable. Moreover, the tip outer cylinder body, the front plate, and the positioning liner form an insertion hole through which the blade body and the arrow body are inserted at the central portion. Further, a pair of spring holes for inserting a spring for biasing and closing the expandable blade body are formed in the opposing portions of the peripheral wall of the tip outer cylinder body, and a pair of fixing pins for pressing and fixing the bases of the springs respectively inserted into the pair of spring holes are detachably mounted on the opposing portions of the peripheral wall, aiming to provide an assembly structure of the crushing mechanism in the rock-splitting packer.

[0020] Further, a pair of positioning plates are mounted on the circumferential wall facing portion of the tip outer cylinder from the outer peripheral side. The positioning plates have a spring hole communicating with the spring hole of the tip outer cylinder and a positioning protrusion engaging with the outer peripheral side of the positioning liner disposed inside the tip outer cylinder. The tip outer cylinder is characterized in that an insertion hole for inserting the positioning protrusion is formed.

[0021] Further, it is inserted into the tip outer cylinder and has an arrow body insertion hole that communicates with the insertion holes of the tip outer cylinder, the front plate, and the positioning liner and inserts the arrow body. It is characterized by including a back plate that guides the advancement of the arrow body.

[0022] Further, the tip of the actuator and the base end of the arrow body have a clevis structure in which they are male-female fitted to each other and connected by a clevis pin. The circumferential wall portion of the crushing mechanism case is characterized in that a pin insertion port for inserting the clevis pin is opened.

[0023] The rock-breaking packer provided with the assembly structure of the crushing mechanism according to the present invention can easily assemble the arrow body and the blade body by anyone without using a plurality of connecting and fixing members as in the prior art or disassembling and assembling the crushing mechanism case for housing and arranging the actuator and the crushing mechanism during the disassembly and assembly operations of the crushing mechanism for exchanging the blade body and the arrow body. After assembly, it is an epoch-making crushing device that maintains the stability of operation and reproduces stable rock crushing work.

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a rock-breaking packer having an assembled structure of a crushing mechanism, FIG. 2 is an exploded perspective view of the rock-breaking packer having the assembled structure of the crushing mechanism, FIG. 3 is a schematic side sectional view of the rock-breaking packer having the assembled structure of the crushing mechanism, FIG. 4 is a sectional perspective view showing the configuration of a crushing mechanism case, FIG. 5 is an explanatory view showing the configuration of a back plate and a front plate, FIG. 6 is an explanatory view showing the configuration of a tip outer cylinder and a front plate, FIG. 7 is an explanatory view showing the configuration of the front plate and a positioning liner, FIG. 8 is a diametrical sectional view showing the configuration of the tip outer cylinder and the positioning liner, FIG. 9 is a schematic side sectional view in which the assembled structure of the crushing mechanism of the rock-breaking packer is partially enlarged, FIGS. 10 to 12 are schematic side sectional views showing the assembled structure of the crushing mechanism of the rock-breaking packer, and FIGS. 13 and 14 are perspective views showing the assembled structure of the crushing mechanism of the rock-breaking packer.

[0025] In the following description, unless otherwise specified, as shown in FIG. 1, based on the advancing / retreating direction of the arrow body and the expanding / closing direction of the blade body, the advancing side of the arrow body is defined as the front side, the retreating side of the arrow body is defined as the rear side, one side is defined as the left side, the other side is defined as the right side, and for the direction orthogonal to the expanding / closing direction of the blade body and the advancing / retreating direction of the arrow body, one side is defined as the upper side and the other side is defined as the lower side.

[0026] [1. Schematic Configuration of Rock-Breaking Packer] First, the schematic configuration of the rock-breaking packer A according to the present invention will be described. As shown in FIGS. 1 and 2, the rock-breaking packer A generally includes a cylindrical crushing mechanism case 1, an actuator 2 connected in series behind the crushing mechanism case 1, and a blade body 3 and an arrow body 4 as a crushing mechanism A1, the base end of which is housed and arranged in the crushing mechanism case 1 and the tip portion of which protrudes from the crushing mechanism case 1. By press-fitting the arrow body 4 into the blade body 3, the blade body 3 is configured to expand and operate to crush the rock from the drilling position.

[0027] As shown in FIGS. 3 and 4, the crushing mechanism case 1 has a case main body portion 11 forming a cylindrical shape for most of it, and a tip outer cylinder 10 integrally connected at the tip of the case main body portion 11.

[0028] The case main body 11 is a cylindrical portion that extends longitudinally in the front-rear direction, and serves as a space for arranging a circular cylindrical hole in a cross-sectional view so that the actuator 2 and the arrow body 4 connected to the actuator 2 can advance and retract in the front-rear direction.

[0029] The tip outer cylindrical body 10 is a cylindrical portion that extends short longitudinally in the front-rear direction, and serves as a space for accommodating the base portion of the blade body 3 in a circular cylindrical hole in a cross-sectional view and holding the blade body 3 so that it can be expanded toward the tip side.

[0030] The tip outer cylindrical body 10 has an outer diameter larger than the outer diameter of the case main body 11 in an axial view, and has a shape that bulges radially outward at the tip of the case main body 11. As shown in FIGS. 3(a), 3(b), and 9, the peripheral wall of the tip outer cylindrical body 10 is formed thicker than the peripheral wall of the case main body 11.

[0031] As shown in FIG. 2, the blade body 3 is composed of a pair of left and right blade units 30, 30' that can be inserted into the rock during drilling, and the base portion is held with respect to the tip outer cylindrical body 10 of the crusher case 1, and is configured to be expandable on the tip side of the tip outer cylindrical body 10.

[0032] The blade units 30, 30' are each made of an elongated bar-shaped steel material, and are formed in a tapered shape with gradually increasing thickness from the base end side to the tip end side. The blade units 30, 30' have inner surfaces that are inclined and opposed to each other as sliding surfaces on which the outer surfaces on the left and right sides of the arrow body 4 slide in contact.

[0033] As shown in FIG. 2, the blade units 30, 30' have blade main body portions 31 that form most of the blade body 3 and contact the rock to generate a wedging action, spring fitting portions 32, 32' into which the tips of the springs 34 are fitted outside the base portions, and projecting pieces 33, 33' that project in the vertical direction at the base ends and restrict movement in the advancing and retracting directions within the crusher case 1.

[0034] The blade base portions 31, 31' form most of the blade body 3, are formed with increasing thickness toward the tip direction, and expand the tip outer portion by the press-fitting operation of the arrow body 4 to contact the rock and cause a wedging action. The blade base portions 31, 31' are formed in a substantially semi-circular shape in cross-section, with the substantially diameter portion of the semi-circle serving as a sliding contact surface with the arrow body 4 and the arc portion of the semi-circle formed as a contact surface that contacts the rock.

[0035] As shown in FIGS. 2, 3(a), 3(b), and 9, the spring fitting portions 32, 32' form circular concave grooves 32a, 32a' in a concave shape along the expanding / closing direction of the blade body 3 (the left-right direction perpendicular to the extending direction of the blade body 3) on the outer surface midway in the front-rear direction of the base.

[0036] The upper and lower surfaces of the spring fitting portions 32, 32' are flat surfaces parallel to each other, serving as sliding contact surfaces that slide against the upper and lower inner surfaces forming the insertion holes 70b of the front plate 70 and the insertion holes 80b of the positioning liner 80 to be described later. That is, the spring fitting portions 32, 32' are formed such that their upper and lower thicknesses are equal to the vertical lengths of the insertion holes 70b of the front plate 70 and the insertion holes 80b of the positioning liner 80.

[0037] The projecting piece portions 33, 33' are engaged and held inside the tip outer cylinder 10, and are portions that enable the blade base portions 31, 31' to expand on the tip side of the tip outer cylinder 10. The projecting piece portions 33, 33' project in the vertical direction of the blade body 3 (the vertical direction perpendicular to the extending direction of the blade body 3) on the rear side of the spring fitting portions 32, 32'.

[0038] The arrow body 4 is connected to an actuator 2 provided behind the crushing mechanism case 1 and is capable of advancing and retreating inside the crushing mechanism case 1.

[0039] As shown in FIG. 2, the arrow body 4 is generally composed of an elongated triangular bar-shaped steel material and is configured by a rod body formed in a tapered shape with gradually decreasing thickness from the base end side to the tip end side. The arrow body 4 has an arrow main body portion 40 that is press-fitted between a pair of single blades 30, 30' and a connecting portion 41 formed at the base end portion and connected to the tip end portion of the actuator 2.

[0040] As shown in FIGS. 2, 3(a) and 3(b), the arrow main body 40 has a tapered surface with the outer surfaces on the left and right sides approaching each other from the base end side to the tip end side so that the whole is pointed at the tip, and this tapered surface is used as a sliding contact surface that faces and slides on the opposing sliding contact surfaces of the vane main bodies 31 and 31'.

[0041] The upper and lower surfaces of the arrow main body 40 are flat surfaces parallel to each other, and are used as sliding contact surfaces that slide on the upper and lower inner surfaces forming the insertion holes 70b of the front plate 70 and the insertion holes 80b of the positioning liner 80, which will be described later. That is, the arrow main body 40 of the arrow body 4 is formed such that the upper and lower thicknesses are equal to the vertical lengths of the insertion holes 70b of the front plate 70 and the insertion holes 80b of the positioning liner 80.

[0042] The connecting portion 41 is formed in a substantially square shape, and as shown in FIGS. 3(a) and 3(b), 10, 13(a) and 13(b), it is configured to have a clevis hole 41a penetrating in the thickness direction (vertical direction) of the arrow body 4 at the central portion in plan view. The upper and lower surfaces of the connecting portion 41 are flat surfaces parallel to each other, and are used as crimping surfaces that are crimped between the clevis pieces 22a and 22a' provided at the tip of the actuator 2, which will be described later.

[0043] As shown in FIGS. 2, 3(a) and 3(b), the actuator 2 is a hydraulic cylinder 20, which is composed of a cylinder tube 21 and a piston rod 22 that protrudes and retracts from the cylinder tube 21 in the tip direction of the cylinder axis. Note that the actuator 2 is not limited to the hydraulic cylinder 20 as long as it can move the arrow body 4 forward and backward, and it does not matter whether it is electric, hydraulic, pneumatic, or high-pressure gas type.

[0044] The hydraulic cylinder 20 is configured such that the piston rod 22 is inserted into the cylinder hole of the crushing mechanism case 1 from the rear side, and the front end 21a of the cylinder tube 21 can be fitted into the rear end 1a of the crushing mechanism case 1. The outer diameter of the front end 21a of the cylinder tube 21 is slightly reduced compared to the outer diameter of the rear half of the cylinder tube 21 that forms most of it.

[0045] At a predetermined position in the circumferential direction of the hydraulic cylinder 20, as shown in FIGS. 1 to 3(b), couplers 23, 23' for connecting a hydraulic hose for discharging and supplying hydraulic pressure to the hydraulic cylinder 20 are provided. The couplers 23, 23' are composed of a front coupler 23 that protrudes upward at the upper front portion of the cylinder tube 21 and a rear coupler 23' that protrudes upward at the upper rear portion of the cylinder tube 21.

[0046] At the tip of the actuator 2 (piston rod 22 of the hydraulic cylinder 20), as shown in FIGS. 10 to 13(b), plate-shaped upper clevis pieces 22a and lower clevis pieces 22a' that sandwich the connecting portion 41 of the arrow body 4 from above and below protrude toward the tip (front side).

[0047] At the central portion of the plate surfaces of the upper clevis piece 22a and the lower clevis piece 22a', upper clevis holes 22b and lower clevis holes 22b' that communicate with the clevis hole 41a formed in the connecting portion 41 are formed through while sandwiching the connecting portion 41 of the arrow body 4 from above and below.

[0048] That is, the tip of the actuator 2 and the base end portion of the arrow body 4 have a clevis structure that integrally connects the actuator 2 and the arrow body 4 by fitting the upper clevis piece 22a and the lower clevis piece 22a provided on the actuator 2 and the connecting portion 41 of the arrow body 4 in a male-female manner and inserting a clevis pin 24 into the respective communicating clevis holes 41a, 22b, 22b'. Note that reference numeral 25 is a retaining ring that is externally fitted to the clevis pin 24 inserted into each of the clevis holes 41a, 22b, 22b'. The retaining ring 25 is externally fitted to the upper portion of the clevis pin 24 inserted into each of the clevis holes 41a, 22b, 22b' to prevent the clevis pin 24 from falling out of each of the clevis holes 41a, 22b, 22b'.

[0049] Also, pin insertion openings 1b, 1b' for inserting the clevis pin 24 therein are circularly opened in the peripheral wall portion of the crushing mechanism case 1.

[0050] The pin insertion ports 1b and 1b' are formed in the upper and lower portions of the peripheral wall of the case body portion 11 of the crushing mechanism case 1 where the clevis holes 41a, 22b, and 22b' where the tip of the actuator 2 and the base end portion of the arrow body 4 are in male-female fitting and communicate with each other are relatively positioned in a state where the piston rod 22 of the hydraulic cylinder 20 is in the most retracted position inside the rear end of the crushing mechanism case 1. That is, the upper pin insertion port 1b and the lower pin insertion port 1b' are formed to penetrate in the same direction as the axial direction of the clevis holes 41a, 22b, and 22b'.

[0051] Note that the rear end 1a of the crushing mechanism case 1 and the front end 21a of the hydraulic cylinder 20 as the actuator 2 are configured to be male-female fitted to each other and connected via a lock nut 5 as shown in FIGS. 2 and 10 to 13(b).

[0052] The rear end 1a of the crushing mechanism case 1 has a female fitting portion that externally fits the rear opening to the front end 21a of the cylinder tube 21, and has a diameter slightly larger than that of the body portion of the case body portion 11. The front end 21a of the cylinder tube 21 of the hydraulic cylinder 20 is received and fitted from the rear.

[0053] The lock nut 5 is an annular coupling member, and as shown in FIGS. 2 and 10 to 13(b), it has a front case fixing portion 50 that is externally fitted to the crushing mechanism case 1 and integrally fixed, and a rear cylinder fixing portion 51 that is externally fitted to the middle portion of the hydraulic cylinder 20 and detachably fixed. That is, the lock nut 5 has a case fixing portion 50 on the front side and a cylinder fixing portion 51 on the rear side with the axial center portion on the inner peripheral surface as a boundary.

[0054] The cylinder fixing portion 51 forms a plurality of pin insertion holes 51a into which fixing lock pins (not shown) are inserted at regular intervals in the circumferential direction. Further, the cylinder tube 21 has a pin engagement groove 21b corresponding to the pin insertion hole 51a of the cylinder fixing portion 51 at the front end 21a.

[0055] That is, the front end 21a of the cylinder tube 21 is fitted into the cylinder fixing portion 51 of the lock nut 5, and a fastening member (not shown) such as a lock pin or a screw is inserted into the communicated pin insertion hole 51a and the pin engagement groove 21b and tightened, thereby integrally connecting the crushing mechanism case 1 and the hydraulic cylinder 20.

[0056] At a predetermined position of the crushing mechanism case 1 and the hydraulic cylinder 20 integrally connected by the lock nut 5 in this way, a front handle 6 and a rear handle 6' for an operator who crushes rocks to lift the stone cutter packer A are provided.

[0057] The front handle 6 is configured to be vertically divided and assembled. In the assembled state, it is externally fitted from above and below so as to close the pin insertion ports 1b, 1b' formed in the peripheral wall in the axial direction of the crushing mechanism case 1.

[0058] The front handle 6 has a ring-shaped front grip portion 61 that corresponds to the upper half and is grasped by one finger of the operator, and a front fixing portion 62 that corresponds to the lower half and is fixed to the crushing mechanism case 1 together with the front grip portion 61.

[0059] The front grip portion 61 is composed of an upper concave portion 61a having a substantially semi-circular arc shape along the upper half of the peripheral wall of the crushing mechanism case 1 at the central bottom, upper connecting portions 61b, 61b that project in a flange shape from both ends of the upper concave portion 61a, and a ring-shaped grip main body portion 61c that overhangs forward from the upper connecting portions 61b, 61b in a side view.

[0060] The front fixing portion 62 is composed of a lower concave portion 62a having a substantially semi-circular arc shape along the lower half of the peripheral wall of the crushing mechanism case 1 at the central portion, and lower connecting portions 62b, 62b that project in a flange shape from both ends of the lower concave portion 62a to the left and right outer sides.

[0061] That is, the front handle 6 sandwiches the crushing mechanism case 1 from above and below by the upper front gripping portion 61 and the lower front fixing portion 62, brings the upper concave portion 61a and the lower concave portion 62a into contact with the peripheral surface of the crushing mechanism case 1, abuts the upper connecting portions 61b, 61b and the lower connecting portions 62b, 62b, inserts a fastening member 63 such as a bolt or a screw therethrough, and tightens it, thereby being integrally fixed to the crushing mechanism case 1.

[0062] In other words, in the front handle 6, the front gripping portion 61 (upper concave portion 61a) closes the upper pin insertion port 1b of the crushing mechanism case 1, and the front fixing portion 62 (lower concave portion 62a) closes the lower pin insertion port 1b' of the crushing mechanism case 1.

[0063] Also, the rear handle 6' basically has the same configuration as the front handle 6 in a front-rear contrast. The rear handle 6' is configured to be vertically divisible and assemblable, and in the assembled state, it is externally fitted to the outer periphery in the axial direction of the hydraulic cylinder 20 from above and below at the rear end.

[0064] The rear handle 6' has a rear gripping portion 61' that corresponds to the upper half and is gripped by the operator, and a rear fixing portion 62' that corresponds to the lower half and is fixed to the crushing mechanism case 1 together with the rear gripping portion 61'.

[0065] The rear gripping portion 61' is composed of an upper concave portion 61a' having a substantially semi-circular arc shape along the upper half of the peripheral wall of the hydraulic cylinder 20 at the central bottom, upper connecting portions 61b', 61b' that project in a flange shape from both ends of the upper concave portion 61a', and a ring-shaped gripping main body portion 61c' that overhangs rearward from the upper connecting portions 61b', 61b' in a side view.

[0066] The rear fixing portion 62' is composed of a lower concave portion 62a' having a substantially semi-circular arc shape along the lower half of the peripheral wall of the hydraulic cylinder 20 at the central portion, and lower connecting portions 62b', 62b' that project in a flange shape to the left and right outside from both ends of the lower concave portion 62a'.

[0067] That is, the rear handle 6' sandwiches the hydraulic cylinder 20 from above and below by the rear fixing portion 62' below the upper rear gripping portion 61', and brings the upper recess 61a' and the lower recess 62a' into contact with the cylinder peripheral surface. The upper connecting portions 61b', 61b' and the lower connecting portions 62b', 62b' are butted against each other, and a fastening member 63' such as a bolt or a screw is inserted and tightened, so that it is integrally fixed to the hydraulic cylinder 20.

[0068] In this way, the front handle 6 and the rear handle 6' attached to the tip outer cylinder body 10 and the actuator 2 protrude above the front coupler 23 and the rear coupler 23'.

[0069] Specifically, the front handle 6 and the rear handle 6' arrange the gripping main body portions 61c, 61c' at the outer peripheral positions of the crusher case 1 and the actuator 2 where the front coupler 23 and the rear coupler 23' are provided in the axial direction view, and arrange the upper end portions of the gripping main body portions 61c, 61c' above the upper ends of the front coupler 23 and the rear coupler 23' protruding upward from the outer peripheral surface of the actuator 2.

[0070] In particular, the gripping main body portion 61c' of the rear handle 6' is straddled with the rear coupler 23' disposed therebetween. Thereby, it is possible to prevent the front handle 6 and the rear handle 6' from physically damaging the front coupler 23 and the rear coupler 23'.

[0071] The stone cutter packer A configured as described above, at the actual stone cutting site, first drills a plurality of holes along the stone cutting line in the rock to be cut with a drill, and sequentially inserts the blade body 3 in the closed form as shown in Fig. 3(a) therein. As shown in Fig. 3(b), the arrow body 4 in the middle is slid forward (tip side) to expand the blade body 3 to perform crushing of the rock along the stone cutting line.

[0072] [2. Specific Configuration of Crushing Mechanism] Next, the configuration of the crushing mechanism A1 according to the embodiment of the present invention will be described in detail. As shown in FIG. 2, the crushing mechanism A1 is provided at the tip of the crushing mechanism case 1, and includes a hollow front outer cylinder 10 having engaging concavo-convex portions 12 formed on the inner peripheral surface 10a, a front plate 70 disposed inside the front outer cylinder 10 and having engaging concavo-convex portions 71 engageable with the engaging concavo-convex portions 12 formed on the outer peripheral surface 70a, and a positioning liner 80 disposed inside the front outer cylinder 10 in close contact with the front plate 70 and having positioning concavo-convex portions 81 engageable with the engaging concavo-convex portions 12 on the inner surface of the front outer cylinder 10 and the engaging concavo-convex portions 71 of the front plate 70 formed on the outer peripheral surface 80a, and is configured to be more assemblable.

[0073] The front outer cylinder 10, the front plate 70, and the positioning liner 80 are each formed with insertion holes 10b, 70b, 80b for inserting the blade body 3 and the arrow body 4 through their respective central portions. Each of the insertion holes 10b, 70b, 80b communicates with the cylindrical hole of the case main body 11.

[0074] Further, the engaging concavo-convex portions 12 of the front outer cylinder 10, the engaging concavo-convex portions 71 of the front plate 70, and the positioning concavo-convex portions 81 of the positioning liner 80 are male-female fitted to each other inside the front outer cylinder 10 to hold the arrow body 4 and the blade body 3 operably at the tip of the crushing mechanism case 1.

[0075] As shown in FIGS. 3 and 4, the front outer cylinder 10 has a large cylinder portion 100 that houses and disposes the spring fitting portions 32, 32' of the positioning liner 80, the front plate 70, and the blade body 3 in the substantially front half in the axial direction, and a small cylinder portion 101 that houses and disposes the protruding pieces 33, 33' of the blade body 3 and the back plate 90 with a reduced inner diameter compared to the large cylinder portion 100 in the substantially rear half in the axial direction.

[0076] The engaging concavo-convex portions 12 of the front outer cylinder 10 are formed by engaging convex portions 120 and engaging concave portions 121 alternately formed along the circumferential direction at the front part of the inner peripheral surface 10a of the large cylinder portion 100 of the front outer cylinder 10 to form a spline groove along the axial direction.

[0077] As shown in Fig. 4, the engaging convex portions 120 project radially inward from the inner peripheral surface 10a of the distal outer cylinder 10 as annular fan-shaped steps in a radial cross-sectional view, and a plurality of them are formed at regular intervals along the circumferential direction of the inner peripheral surface 10a of the distal outer cylinder 10. The engaging convex portions 120 are annular sectors with a length approximately 1 / 8 of the inner circumference of the distal outer cylinder 10 in an axial cross-sectional view, and are formed by protruding four (point-symmetric about the axis center) diametrically opposite to the inner peripheral surface 10a of the distal outer cylinder 10.

[0078] More specifically, as shown in Figs. 6(a) to 6(c) and Fig. 8(a), in an axial cross-sectional view of the distal outer cylinder 10, one pair of engaging convex portions 120, 120 along the diameter direction and the other pair of engaging convex portions 120, 120 along the diameter direction are arranged orthogonally in a cross shape on the inner peripheral surface 10a with the axis of the distal outer cylinder 10 as the center, respectively.

[0079] Since a plurality of (four) engaging convex portions 120 are formed protruding at regular intervals along the circumferential direction on the inner peripheral surface 10a of the distal outer cylinder 10, a plurality of (four) engaging concave portions 121 are formed at regular intervals between the engaging convex portions 120 and along the circumferential direction.

[0080] The engaging concave portions 121 are formed as virtual space portions in an annular fan shape in the same radial cross-sectional view as the engaging convex portions 120 between adjacent engaging convex portions 120, 120. That is, the engaging concave portions 121 are annular sectors with a length approximately 1 / 8 of the inner circumference of the distal outer cylinder 10 in an axial cross-sectional view, similar to the engaging convex portions 120, and are formed by four (point-symmetric about the axis center) diametrically opposite to the inner peripheral surface 10a of the distal outer cylinder 10.

[0081] More specifically, in an axial cross-sectional view of the distal outer cylinder 10, one pair of engaging concave portions 121, 121 along the diameter direction and the other pair of engaging concave portions 121, 121 along the diameter direction are arranged orthogonally in a cross shape on the inner peripheral surface 10a with the axis of the distal outer cylinder 10 as the center, respectively.

[0082] In the inner space formed by the engaging concave-convex portion 12, as shown in FIGS. 3(a) to 3(b) and FIG. 9, a positioning liner 80 is housed. That is, the engaging concave-convex portion 12 functions as a housing portion for the positioning liner 80.

[0083] Further, in the tip outer cylinder 10, since the engaging concave-convex portion 12 is formed at the front portion of the inner peripheral surface 10a, a front plate housing portion 13 in which the front plate 70 is housed and arranged behind the engaging concave-convex portion 12 is formed.

[0084] In other words, in the axial direction of the tip outer cylinder 10, an engaging concave-convex portion 12 in which the positioning liner 80 is fitted and arranged is formed in the front half portion of the large cylinder portion 100 of the tip outer cylinder 10, and a front plate housing portion 13 in which the front plate 70 is fitted and arranged is formed in the rear half portion of the large cylinder portion 100 of the tip outer cylinder 10.

[0085] As shown in FIGS. 3(a) to 3(b) and FIG. 9, the front plate housing portion 13 is formed in the axial direction of the tip outer cylinder 10 with a front-rear length corresponding to the plate thickness of the front plate 70 between the engaging concave-convex portion 12 and the small cylinder portion 101.

[0086] That is, in the axial direction of the large cylinder portion 100 of the tip outer cylinder 10, as shown in FIGS. 3(a) to 4 and FIG. 9, the front plate housing portion 13 is formed as a space portion between the rear surface of the engaging convex portion 120 of the engaging concave-convex portion 12 with which the front surface of the engaging convex portion 710 of the front plate 70 abuts and the front end portion 101a of the small cylinder portion 101 with which the rear surface of the front plate 70 abuts. That is, the front end portion 101a of the small cylinder portion 101 serves as an abutting step portion against which the front plate 70 abuts.

[0087] Further, as shown in FIG. 4, a back plate housing portion 14 in which a back plate 90 is housed and arranged is formed on the rear side of the front plate housing portion 13. The back plate housing portion 14 is formed in the small cylinder portion 101 having a smaller diameter than the front plate housing portion 13 between the front plate housing portion 13 and the case main body portion 11.

[0088] Specifically, the back plate storage portion 14 is formed at the rear part of the small cylinder portion 101 of the tip outer cylinder body 10. As shown in FIGS. 4 and 9, the back plate storage portion 14 uses the front end portion 110a of the case main body portion 11, which is the boundary portion with the small cylinder portion 101, as an abutting step portion against which the rear peripheral surface of the back plate 90 abuts.

[0089] Also, as shown in FIGS. 2 to 4 and FIG. 8(a), a pair of spring holes 15, 15' for inserting a spring 34 for biasing and closing the blade body 3 are formed in the circumferential wall opposing portion of the tip outer cylinder body 10.

[0090] The spring holes 15, 15' are formed to penetrate the circumferential wall in the diameter direction of the tip outer cylinder body 10 and communicate with the inner insertion hole 10b in the radial direction. Further, the spring holes 15, 15' are formed by penetrating the central portions of the engaging convex portions 120, 120 that project from the inner circumferential surface 10a of the tip outer cylinder body 10 in the opposing direction.

[0091] Also, as shown in FIGS. 8(b) to 9, pin locking grooves 16, 16' for locking a pair of fixing pins 85, 85' for pressing and fixing the spring 34 are provided in the middle portions of the spring holes 15, 15' (inside the circumferential wall opposing portion of the tip outer cylinder body 10).

[0092] Details will be described later, but as shown in FIGS. 8(a) to 9, the fixing pins 85, 85' have engaging protrusions 851, 851' that project radially outward from the body portions 850, 850'. The engaging protrusions 851, 851' are provided so as to project outward in the diameter direction in the axial view from the circumferential surface of the middle portion of the body portions 850, 850'.

[0093] In other words, the spring holes 15, 15' are formed with a cross-sectional shape corresponding to the cross-sectional shape formed by the body portions 850, 850' of the fixing pins 85, 85' and the engaging protrusions 851, 851'. Specifically, in the axial view, the spring holes 15, 15' have a circular spring insertion portion through which the body portions 850, 850' of the fixing pins 85, 85' and the spring 34 are inserted, and a protrusion insertion portion formed by notching outward in the radial direction from the spring insertion portion and through which the engaging protrusions 851, 851' of the fixing pins 85, 85' are inserted.

[0094] Further, the pin locking grooves 16, 16' are formed along the tangential direction of the tip outer cylinder 10, and are formed to be annularly recessed radially outward at the middle part of the spring holes 15, 15'.

[0095] Thereby, the fixing pins 85, 85' inserted into the spring holes 15, 15' are rotated within the spring holes 15, 15', and as shown in FIGS. 8(b) and 9, the engaging protrusions 851, 851' of the body portions 850, 850' are arranged from the protrusion insertion portions 151, 151' into the pin locking grooves 16, 16' to engage the fixing pins 85, 85' with the tip outer cylinder 10.

[0096] Also, in the circumferential wall opposing portion of the tip outer cylinder 10, near the spring holes 15, 15', pin insertion holes 17, 17' through which positioning protrusions 841, 841' formed on the positioning plates 84, 84' and engaging with the outer peripheral side of the positioning liner 80 are inserted are penetratingly provided. The pin insertion holes 17, 17' align the axial direction along the tangential direction of the tip outer cylinder 10 and parallel to the axial direction of the central spring holes 15, 15'. Although details will be described later, the positioning plates 84, 84' engage with the outer peripheral wall of the tip outer cylinder 10 to fix the positioning liner 80 fitted inside the tip outer cylinder 10.

[0097] The back plate 90 is a thin disk member disposed at the rearmost part inside the tip outer cylinder 10 as shown in FIGS. 3(a) and 3(b), which restricts the advancing position of the arrow body 4 and holds the posture of the arrow body 4 inside the crushing mechanism case 1.

[0098] At a predetermined position on the outer peripheral surface 90a of the back plate 90, as shown in FIGS. 5(a) and 5(b), two engaging grooves 92, 92' that engage with the back plate locking pins 93, 93' from the radial direction are formed as notches vertically. The engaging grooves 92, 92' are opposed to each other in the diameter direction on the outer periphery of the back plate 90 and are formed to be recessed radially inward.

[0099] As shown in FIG. 4, the back plate locking pins 93 and 93' are inserted into a pair of upper and lower pin insertion holes 101b and 101b' formed by penetrating the peripheral wall of the rear end portion of the small cylinder portion 101 in the diametrical direction as viewed in the axial direction of the back plate 90. As shown in FIG. 5(a), the back plate 90 positions the upper and lower engagement grooves 92 and 92' in the upper and lower pin insertion holes 101b and 101b' of the small cylinder portion 101 respectively, and by inserting the back plate locking pins 93 and 93' into the pin insertion holes 101b and 101b', it is integrally fixed inside the front outer cylinder 10.

[0100] Further, as shown in FIGS. 5(a) and 5(b), the back plate 90 has a substantially rectangular arrow body insertion hole 91 through which the arrow body portion 40 of the arrow body 4 is inserted at the central portion of the plate surface. The arrow body insertion hole 91 is formed such that the diameter of the hole is such that the arrow body portion 40 of the arrow body 4 can slide in the axial direction (front-rear direction), and the diameter is smaller than that of the connecting portion 41. The vertical length of the arrow body insertion hole 91 is substantially the same as the thickness of the arrow body portion 40 of the arrow body 4.

[0101] That is, inside the crushing mechanism case 1, the back plate 90 inserts the arrow body portion 40 of the arrow body 4 into the arrow body insertion hole 91, is disposed on the front side of the connecting portion 41 of the arrow body 4, and functions as a guide plate that slidably contacts the upper and lower surfaces of the arrow body portion 40 on the upper and lower inner surfaces of the arrow body insertion hole 91 to guide the forward and backward movement of the arrow body 4.

[0102] Note that the arrow body insertion hole 91 communicates with the insertion hole 10b which is the cylindrical hole of the front outer cylinder 10, the insertion hole 70b of the front plate 70 described later, and the insertion hole 80b of the positioning liner 80. Also, in FIG. 5(b), reference numeral 94 denotes a tool engagement hole 94 that engages with an operating tool such as a pull screw used for the detachment and fitting operation of the back plate 90 to the back plate housing portion 14.

[0103] As shown in FIGS. 3(a) and 3(b), the front plate 70 is a thick disk member that fits into the front plate storage portion 13 between the engaging concave and convex portions 12 of the distal outer cylindrical body 10 and the front end portion 101a of the small cylindrical portion 101 inside the distal outer cylindrical body 10. As shown in FIG. 5(c), the outer peripheral surface 70a has engaging concave and convex portions 71 that correspond to the engaging concave and convex portions 12 of the distal outer cylindrical body 10 from the axial direction.

[0104] The engaging concave and convex portions 71 of the front plate 70 are composed of engaging convex portions 710 and engaging concave portions 711 that are alternately formed along the circumferential direction of the outer peripheral surface 70a in FIG. 6(a). As shown in FIG. 6(b), in the front plate 70, the engaging convex portion 710 has a shape that can be inserted axially into the engaging concave portion 121 of the distal outer cylindrical body 10. Also, the engaging concave portion 711 has a shape that can be inserted axially into the engaging convex portion 120 of the distal outer cylindrical body 10.

[0105] The engaging convex portion 710 projects radially outward from the outer peripheral surface 70a as an annular fan-shaped flange portion in a radial cross-sectional view, and a plurality of them are formed at regular intervals along the circumferential direction of the outer peripheral surface 70a. The engaging convex portion 710 is approximately 1 / 8 of the length of the inner circumference of the distal outer cylindrical body 10 in an axial view, and four (point-symmetric about the axis center) project from the outer peripheral surface 70a in the diameter direction.

[0106] More specifically, in an axial view of the front plate 70, one pair of engaging convex portions 710, 710 along the diameter direction and the other pair of engaging convex portions 710, 710 along the diameter direction are relatively arranged orthogonally in a cross shape on the outer peripheral surface 70a with the axis of the front plate 70 as the center.

[0107] By forming a plurality (four) of the engaging convex portions 710 projecting at regular intervals along the circumferential direction on the outer peripheral surface 70a of the front plate 70, a plurality (four) of engaging concave portions 711 are formed at regular intervals between the engaging convex portions 710 and along the circumferential direction.

[0108] The engaging concave portion 711 is formed as an annular fan-shaped virtual space portion in the same diameter cross-sectional view as the engaging convex portions 710, 710 between adjacent engaging convex portions 710. That is, the engaging concave portion 711 is, like the engaging convex portion 710, an annular fan shape with a length approximately 1 / 8 of the inner circumference of the front end outer cylinder 10 in the axial direction view, and four are formed diametrically opposed from the outer peripheral surface 70a of the front plate 70 (point-symmetric about the axis center).

[0109] More specifically, in the axial direction view of the front plate 70, one pair of engaging concave portions 711, 711 along the diameter direction and the other pair of engaging concave portions 711, 711 along the diameter direction are relatively arranged orthogonally in a cross shape on the outer peripheral surface 70a with the axis of the front plate 70 as the center.

[0110] The front plate 70 is inserted into the engaging concave portion 121 and the engaging convex portion 120 of the engaging concave-convex portion 12 of the front end outer cylinder 10 with the engaging convex portion 710 and the engaging concave portion 711 of the engaging concave-convex portion 71 respectively, and is rotatably fitted in the front plate storage portion 13 between the engaging concave-convex portion 12 of the front end outer cylinder 10 and the front end portion 101a of the small cylinder portion 101 by moving backward in the axial direction.

[0111] That is, when inserting the front plate 70 into the front plate storage portion 13 of the front end outer cylinder 10, as shown in FIG. 6(b), in the axial direction view, the engaging concave-convex portion 71 of the front plate 70 is positioned out of phase with the engaging concave-convex portion 12 of the front end outer cylinder 10, and while engaging the engaging concave-convex portion 71 and the engaging concave-convex portion 12 with male-female fitting, the front plate 70 is moved to the rear side in the axial direction of the front end outer cylinder 10. Thereby, the front plate 70 is stored in the front plate storage portion 13 of the front end outer cylinder 10.

[0112] In such a storage arrangement state of the front plate 70 in the front plate storage portion 13, since the fitting between the engaging concave-convex portion 71 of the front plate 70 and the engaging concave-convex portion 12 of the front end outer cylinder 10 is released, the front plate 70 becomes rotatable in the circumferential direction inside the front plate storage portion 13.

[0113] Then, by rotating the front plate 70 while it is disposed in the front plate storage portion 13, as shown in FIG. 6(c), the engaging convex portion 710 is superposed and engaged with the engaging convex portion 120 of the distal end outer cylinder 10 in an axial view, and the engaging concave portion 711 is superposed and disposed in the engaging concave portion 121 of the distal end outer cylinder 10.

[0114] That is, in an axial view, the engaging concavo-convex portion 71 of the front plate 70 is positioned in the same phase as the engaging concavo-convex portion 12 of the distal end outer cylinder 10, and the engaging concavo-convex portion 71 and the engaging concavo-convex portion 12 are engaged with each other facing in the axial direction.

[0115] Thereby, the front plate 70 is restricted from moving in the axial direction by the engaging concavo-convex portion 12 of the distal end outer cylinder 10 and the front end portion 101a of the small cylinder portion 101 in the front plate storage portion 13. Further, the front plate 70 forms a spline groove into which the positioning concavo-convex portion 81 of the positioning liner 80 fits in a state where the engaging concavo-convex portion 71 is in phase with the engaging concavo-convex portion 12 of the distal end outer cylinder 10 in an axial view.

[0116] Also, as shown in FIGS. 5(c) and 6(a) to 6(b), the front plate 70 has a substantially rectangular insertion hole 70b in an axial view through which the blade body portions 31, 31' of the blade body 3 and the arrow body portion 40 of the arrow body 4 are inserted at the center of the plate surface. The insertion hole 70b is formed to have a diameter such that the blade body portions 31, 31' of the individual blades 30, 30' can approach and separate in the radial direction, and a diameter smaller than that of the projecting pieces 33, 33' of the individual blades 30, 30'.

[0117] More specifically, the insertion hole 70b has a substantially circular arrow body insertion portion 700b through which the arrow body 4 is inserted at the center of the front plate 70 in an axial view, and substantially rectangular blade body insertion portions 701b, 701b' through which the individual blades 30, 30' are inserted on the left and right sides of the arrow body insertion portion 700b, respectively. In FIG. 5(c), reference numeral 73 denotes a tool engaging hole 73 that engages with an operating tool such as a pull screw used for the detachment / attachment operation of the front plate 70 to the front plate storage portion 13.

[0118] That is, the front plate 70 is disposed inside the crushing mechanism case 1, and inserts the arrow main body portion 40 of the arrow body 4 and the blade base body portions 31, 31' of the blade body 3 into the arrow body insertion hole 91, and is disposed in front of the projecting pieces 33, 33' of the individual blades 30, 30', and functions as a guide plate for guiding the expanding / blocking operation of the blade body 3. Specifically, by making the upper and lower surfaces of the insertion hole 70b into sliding contact surfaces with which the upper and lower surfaces of the bases of the pair of individual blades 30, 30' are in sliding contact, each individual blade 30, 30' is guided in the left-right direction.

[0119] The blade body 3 has projecting pieces 33, 33' which are bases disposed so as to be movable in the radial direction (diameter direction) within the small cylinder portion 101 of the tip outer cylinder 10, and the axial movement thereof is restricted by the front plate 70 fixed by a positioning liner 80 and positioning plates 84, 84' described later.

[0120] In other words, in the axial direction of the tip outer cylinder 10, as shown in FIGS. 3(a), 3(b), and 9, the projecting pieces 33, 33' of the blade body 3 are disposed in the internal space of the small cylinder portion 101 between the front plate 70 and the back plate 90. That is, the front plate 70 and the back plate 90 form a blade body holding space portion for holding the base of the blade body 3 by being disposed at a constant interval inside the tip outer cylinder 10.

[0121] Further, the front plate 70 has a liner fitting portion 72 that fits with the positioning liner 80 from the axial direction on the plate surface. The liner fitting portion 72 is formed as a projection that projects forward from the peripheral edge of the insertion hole 70b on the front side plate surface. The liner fitting portion 72 is inserted and fitted to the rear opening edge portion of the insertion hole 80b of the positioning liner 80 on the rear surface side of the positioning liner 80.

[0122] The positioning liner 80 is a thick disk member that fits into the engaging concavo-convex portion 12 on the front side of the back plate 90 inside the tip outer cylinder 10, as shown in FIGS. 3(a), 3(b), 8, and 9. The positioning liner 80 is formed with a thickness substantially the same as the axial length of the engaging concavo-convex portion 12 of the tip outer cylinder 10.

[0123] As shown in FIGS. 7(a) and 7(b), the positioning liner 80 has positioning concavo-convex portions 81 on its outer peripheral surface 80a that axially correspond to the engaging concavo-convex portions 12 of the tip outer cylinder 10 and the engaging concavo-convex portions 71 of the front plate 70. The positioning concavo-convex portions 81 are composed of engaging convex portions 810 and engaging concave portions 811 that are alternately formed along the circumferential direction of the outer peripheral surface 80a.

[0124] In the positioning concavo-convex portions 81, the engaging convex portions 810 have a shape that can be axially inserted and fitted into the engaging concave portions 821 of the tip outer cylinder 10 and the engaging concave portions 711 of the front plate 70. Also, the engaging concave portions 811 have a shape that can be axially inserted and fitted into the engaging convex portions 120 of the tip outer cylinder 10 and the engaging concave portions 711 of the front plate 70.

[0125] The engaging convex portions 810 project radially outward from the outer peripheral surface 80a as annular fan-shaped flange portions in a diametral cross-sectional view, and a plurality of them are formed at regular intervals along the circumferential direction of the outer peripheral surface 80a.

[0126] The engaging convex portions 810 are annular fan-shaped with a length approximately 1 / 8 of the inner circumference of the tip outer cylinder 10 in an axial view, and are formed to project four (axially symmetric with respect to the axis center) diametrically opposite from the outer peripheral surface 80a.

[0127] Specifically, in an axial view of the positioning liner 80, one pair of engaging convex portions 810, 810 along the diameter direction and the other pair of engaging convex portions 810, 810 along the diameter direction are relatively arranged orthogonally in a cross shape on the outer peripheral surface 80a with the axis of the positioning liner 80 as the center.

[0128] That is, on the outer peripheral surface 80a of the positioning liner 80, a plurality of (four) engaging convex portions 810 project at regular intervals along the circumferential direction, whereby a plurality of (four) engaging concave portions 811 are formed between adjacent engaging convex portions 810 and at regular intervals along the circumferential direction.

[0129] The engagement recess 811 is formed as a virtual space portion in an annular fan shape in a diametrical cross-section view identical to that of the engagement protrusion 810 between adjacent engagement protrusions 810, 810.

[0130] Specifically, in an axial view of the positioning liner 80, one pair of engagement recesses 811, 811 along the diameter direction and the other pair of engagement recesses 811, 811 along the diameter direction are relatively arranged orthogonally in a cross shape on the outer peripheral surface 80a with the axis of the positioning liner 80 as the center.

[0131] Further, as shown in FIGS. 7(a) and 7(b), the engagement protrusion 810 has an annular fan-shaped flange portion that is inserted into the engagement recess 711 of the front plate 70 from the axial direction, and extends axially rearward from the rear surface of the positioning liner 80 in a side view.

[0132] The engagement protrusion 810 has a cylindrical fitting portion 810a that is inserted corresponding to the engagement recess 121 of the distal outer cylinder 10, and a plate fitting portion 810b that is inserted corresponding to the engagement recess 711 of the front plate 70. The protruding length of the plate fitting portion 810b is formed to be equal to or less than the plate thickness of the front plate 70, that is, equal to or less than the axial length of the engagement recess 711 of the front plate 70.

[0133] In short, the engagement uneven portions 12 of the distal outer cylinder 10, the engagement uneven portions 71 of the front plate 70, and the positioning uneven portions 81 of the positioning liner 80 are formed to be the same shape and the same size, and have a spline structure that spline-fits with each other.

[0134] That is, the distal outer cylinder 10 and the front plate 70 with the engagement uneven portions 12 of the distal outer cylinder 10 and the engagement uneven portions 71 of the front plate 70 in the same phase are used as a spline groove, and the positioning liner 80 is used as a spline shaft into which the positioning uneven portions 81 are inserted.

[0135] In particular, the front plate 70 and the positioning liner 80 have an integrated internal and external mutual fitting structure in which, on the inside, the liner fitting portion 72 and the rear opening edge of the insertion hole 80b are fitted together, and on the outside, the engaging convex portion 810 is fitted into the engaging concave portion 711, and the insertion holes 70b and 80b are communicated with each other.

[0136] Further, as shown in Fig. 8(a), the positioning liner 80 has an insertion hole 80b in a shape as viewed in the axial direction in which the spring fitting portion 32 of the blade body 3 and the arrow body portion 40 of the arrow body 4 are inserted and arranged at the central portion of the plate surface. The insertion hole 80b is formed with a width diameter such that the blade base portions 31 and 31' of the individual blades 30 and 30' can approach and separate in the radial direction.

[0137] More specifically, as shown in Fig. 7(a) in the axial direction view, the insertion hole 80b has a substantially circular arrow body insertion portion 800b through which the arrow body 4 is inserted at the center of the positioning liner 80, and substantially rectangular blade body insertion portions 801b and 801b' through which the individual blades 30 and 30' are inserted on the left and right sides of the arrow body insertion portion 800b, respectively. In Fig. 8(a), reference numeral 86 denotes a tool engaging hole 86 that engages with an operating tool such as a pulling screw used for the detachment / attachment operation of the positioning liner 80 to the tip outer cylinder 10.

[0138] Of the inner peripheral surfaces forming the rectangular insertion hole 80b, the opposing short sides are formed at the same positions as the pair of engaging concave portions 811 and 811, as shown in Figs. 7(a) to 8(a). Each of the short sides is a surface on which the concave grooves 32a and 32a' of the spring fitting portions 32 and 32' of the two individual blades 30 and 30' inserted into the insertion hole 80b face each other.

[0139] On the opposing portions of the peripheral wall of the positioning liner 80 where the engaging concave portions 811 and 811 are formed, as shown in Figs. 7(a) to 8(a), a pair of spring holes 82 and 82' are formed that communicate with the spring holes 15 and 15' of the tip outer cylinder 10, correspond to the spring fitting portions 32 and 32', and through which the springs 34 and 34' are inserted.

[0140] The spring holes 82, 82' are formed in the circumferential side wall portion of the positioning liner 80 so as to face each other in the diameter direction, and communicate with the inner insertion hole 80b from the radial direction. Further, the spring holes 82, 82' penetrate through the central portions of the opposing engagement recesses 811, 811 formed on the outer peripheral surface 80a of the positioning liner 80, and are formed by penetrating through the short side surface forming the inner peripheral surface of the insertion hole 80b.

[0141] That is, in a state where the positioning liner 80 is fitted to the tip outer cylinder 10, the spring holes 15, 15' of the tip outer cylinder 10 and the spring holes 82, 82' of the positioning liner 80 communicate with each other, and on the radially inner side of the communicating spring holes 15, 15', 82, 82', the spring fitting portions 32, 32' of the blade units 30, 30' arranged in the insertion hole 80b of the positioning liner 80 are located.

[0142] Further, in the circumferential wall opposing portion of the positioning liner 80, in the vicinity of the spring holes 82, 82', as shown in FIGS. 7(a) to 8(a), pin engagement grooves 83, 83' are formed into which the tip portions of the positioning protrusions 841, 841' formed on the positioning plates 84, 84' are fitted.

[0143] The pin engagement grooves 83, 83' are formed at positions on the outer peripheral surface 80a of the positioning liner 80 that communicate with the pin insertion holes 17, 17' formed in the circumferential wall opposing portion of the tip outer cylinder 10 in a state where the positioning liner 80 is fitted to the tip outer cylinder 10 in the axial direction. Specifically, the pin engagement grooves 83, 83' are formed by recessing the edges of the engagement protrusions 810, 810 adjacent to the engagement recesses 811, 811 in the radial direction at the upper and lower sides in the vicinity of the spring holes 82, 82' to form two upper and lower ones.

[0144] As a result, the positioning liner 80, which is fitted to the tip outer cylinder 10 from the axial direction and has its circumferential movement restricted, inserts and engages the positioning protrusions 841, 841' of the positioning plates 84, 84' into the communicating pin insertion holes 17, 17' and pin engagement grooves 83, 83' of the tip outer cylinder 10, and its axial movement from the tip outer cylinder 10 is restricted and fixed. The positioning liner 80 has its front surface flush with the front end surface of the tip outer cylinder 10 in a state of being fitted to the tip outer cylinder 10.

[0145] Also, at a predetermined position on the front surface of the positioning liner 80, locking protrusions 80c, 80c' for locking the resin plate 18 protrude as shown in FIG. 13(b). The locking protrusions 80c, 80c' protrude forward from the upper and lower peripheral edges in the vicinity of the insertion hole 80b on the front surface.

[0146] The resin plate 18 is a disk-shaped resin plate with a certain thickness, and as shown in FIG. 13(b), it has a rectangular window-shaped insertion hole 18a for inserting the blade body 3 and the arrow body 4 through the plate surface, and engaging holes 18b, 18b' that engage with the locking protrusions 80c, 80c' of the positioning liner 80. The resin plate 18 functions as an absorber to prevent the front surface of the positioning liner 80 and the front edge surface of the tip outer cylinder 10 from accidentally hitting the rock directly and causing buckling damage.

[0147] When such a positioning liner 80 is fitted with the positioning uneven portion 81 into the engaging uneven portion 12 of the tip outer cylinder 10 to restrict rotation in the circumferential direction, and is restricted in the axial direction by positioning plates 84, 84' attached to the outside of the tip outer cylinder 10, it is housed and arranged inside the tip outer cylinder 10.

[0148] As shown in FIGS. 2, 8(a), and 14(a), the positioning plates 84, 84' are substantially arc-shaped curved plate members along the outer peripheral wall of the tip outer cylinder 10, and have spring holes 840, 840' communicating with the spring holes 15, 15' of the tip outer cylinder 10, and positioning protrusions 841, 841' inserted through the pin insertion holes 17, 17' of the tip outer cylinder 10.

[0149] The spring holes 840, 840' are formed through the center of the plate surface with a cross-sectional shape corresponding to the cross-sectional shape formed by the body portions 850, 850' and the engaging protrusions 851, 851' of the fixing pins 85, 85'.

[0150] Also, at the peripheral edge of the outer openings of the spring holes 840, 840', a countersunk portion (not shown) that abuts against the bottom edges of the heads 852, 852' of the fixing pins 85, 85' is formed. The countersunk portion is formed such that the spring holes 840, 840' have a smaller diameter than the outer diameter of the heads 852, 852' of the fixing pins 85, 85', and the heads 852, 852' of the fixing pins 85, 85' abut against the upper peripheral edge of the spring holes 840, 840'.

[0151] As shown in FIGS. 8(a) and 14(a), the positioning protrusions 841, 841' are formed to protrude from the plate surface near the periphery of the spring holes 840, 840' inside the arc facing the outer peripheral wall portion of the distal end outer cylinder 10. The protruding directions of the positioning protrusions 841, 841' are along the tangential direction of the distal end outer cylinder 10 and parallel to the axial direction of the central spring holes 840, 840'.

[0152] As shown in FIGS. 8(a) to 9 and FIGS. 14(a), the fixing pins 85, 85' have flat disk-shaped heads 852, 852', body portions 850, 850' that extend downward at the central portions of the lower surfaces of the heads 852, 852', engaging protrusions 851, 851' that protrude radially outward from the peripheral surfaces of the body portions 850, 850' in a point-symmetrical manner about the axis, and tip portions 853, 853' that press the base portions of the springs 34.

[0153] Cross-shaped tool engaging grooves 852a, 852a' into which tools such as a driver or a coin for rotating the fixing pins 85, 85' are inserted are formed on the top surfaces of the heads 852, 852'.

[0154] The tip portions 853, 853' have a smaller outer diameter than the body portions 850, 850' and are fitted into the springs 34 at the base portions of the springs 34. At the boundary between the tip portions 853, 853' and the body portions 850, 850', a pressing step portion that abuts against the base end surfaces of the springs 34, 34' and presses the springs 34, 34' is formed. That is, the pressing step portion is formed at the boundary with the tip portions 853, 853' as the lower end portions of the body portions 850, 850'.

[0155] As shown in FIGS. 2, 8(a) to 9, and 14(a), the springs 34 and 34' are compression coil springs. They are inserted radially into the spring holes 15 and 15' of the tip outer cylinder 10, abut and engage with the blade body 3 at the tip, and are pressed by the fixing pins 85 and 85', thereby biasing the blade body 3 to close.

[0156] Specifically, the springs 34 and 34' are inserted through the spring holes 15 and 15' of the tip outer cylinder 10 that communicate with each other, the spring holes 82 and 82' of the positioning liner 80, and the spring holes 840 and 840' of the positioning plates 84 and 84'. As shown in FIGS. 8(a) to 9, the ends are fitted into the concave grooves 32a and 32a' in the spring fitting portions 32 and 32' of the single blade bodies 30 and 30', and are fixed by the fixing pins 85 and 85' that engage and fix to the tip outer cylinder 10 from the base end portions, and are shrink - deformed and press - fitted.

[0157] Thereby, with the base end portions of the springs 34 and 34' fixed inside the tip outer cylinder 10 by the fixing pins 85 and 85' as fixed ends, they are shrink - deformed, and the reaction force of extension and return is transmitted from the tip portions to the single blade bodies 30 and 30', constantly biasing the single blade bodies 30 and 30' in the opposite directions.

[0158] That is, in order to hold the arrow body 4 and the blade body 3 in the crushing mechanism case 1, the back plate 90, the front plate 70, and the positioning liner 80 are sequentially fitted and arranged in the axial direction inside the tip outer cylinder 10, the positioning plates 84 and 84' are mounted on the outer side portion of the tip outer cylinder 10, and the spring 34 is inserted into the spring holes 15 and 15'.

[0159] Finally, by engaging the fixing pins 85 and 85' with the pin locking grooves 16 and 16' of the tip outer cylinder 10, the assembly work of the crushing mechanism A1 can be completed. Therefore, anyone can easily perform the disassembly and assembly work of the crushing mechanism A1 without requiring special tools or special skills.

[0160] [3. Disassembly and assembly work of the crushing mechanism when removing and attaching the blade body] Next, the disassembly and assembly operations of the crushing mechanism A1 in the stone-breaking packer A when the impeller body 3 is removed and installed will be described. The removal and installation operations of the impeller body 3 each consist of a series of three steps: a fixing pin detachment step S1, a positioning liner detachment step S2, and a front plate-impeller body detachment step S3. Hereinafter, the outlines of each step S1 to S3, the removal operation, and the installation operation of the impeller body 3 will be described in detail.

[0161] (1) Fixing pin detachment step S1 The fixing pin detachment step S1 is a step of disengaging the fixing pins 85, 85' from the tip outer cylinder 10 or engaging them with the tip outer cylinder 10, and is the first step performed during the removal operation of the impeller body 3 or the last step performed during the installation operation. This step S1 includes the removal and installation operations of the fixing pins 85, 85', as well as the removal and installation operations of the springs 34, 34' and the positioning plates 84, 84'.

[0162] Specifically, this step S1 is a step of releasing and engaging the fixing pins 85, 85', the springs 34, 34', and the positioning plates 84, 84' with respect to the tip outer cylinder 10 and the positioning liner 80, and releasing and restricting the axial movement of the positioning liner 80 within the tip outer cylinder 10.

[0163] (2) Positioning liner detachment step S2 The positioning liner detachment step S2 is a step of removing the positioning liner 80 from within the tip outer cylinder 10 or fitting it into the tip outer cylinder 10, and is an intermediate step performed during both the removal operation and the installation operation of the impeller body 3. This step S2 includes the removal and installation operations of the positioning liner 80, as well as the removal and installation operations of the resin plate 18.

[0164] Specifically, in this step S2, the front surface of the positioning liner 80 is disengaged or engaged with the resin plate 18, and the engaging concave and convex portions 81 of the positioning liner 80 are disengaged or engaged with the engaging concave and convex portions 12 of the tip outer cylinder 10 and the engaging concave and convex portions 71 of the front plate 70, so that the positioning liner 80 is detached from the tip outer cylinder 10 or disposed on the tip outer cylinder 10, and the circumferential movement of the front plate 70 in the tip outer cylinder 10 is released or restricted.

[0165] (3) Front plate - blade body detachment / attachment step S3 The front plate - blade body detachment / attachment step S3 is a step of detaching the front plate 70 and the blade body 3 from inside the tip outer cylinder 10 or mounting them inside the tip outer cylinder 10, and is the last step performed during the removal operation of the blade body 3 or the first step performed during the attachment operation.

[0166] Specifically, in this step S3, the front plate 70 is rotated by a predetermined angle (45°) in the circumferential direction to disengage or engage the engaging concave and convex portions 71 of the front plate 70 with the engaging concave and convex portions 12 of the tip outer cylinder 10, release or restrict the axial movement of the front plate 70 in the tip outer cylinder 10, detach the front plate 70 from the front plate storage portion 13 or dispose it in the front plate storage portion 13, and remove the blade body 3 from the tip outer cylinder 10 or hold it on the tip outer cylinder 10.

[0167] (4) Removal operation of the blade body The removal operation of the blade body 3 is performed in the order of the above-described fixed pin detachment step S1 → positioning liner detachment step S2 → front plate - blade body detachment / attachment step S3. When removing the blade body 3 from the tip outer cylinder 10, the operator first removes the fixed pins 85, 85' and the positioning plates 84, 84' and the springs 34, 34' from the tip outer cylinder 10 as the fixed pin detachment step S1.

[0168] Specifically, as shown in FIGS. 14(a) and 14(b), by turning the fixing pins 85, 85' of the positioning plates 84, 84', the engagement between the tip outer cylinder 10 and the fixing pins 85, 85' is released, the springs 34, 34' are removed from the spring holes 15, 15', and the positioning plates 84, 84' are removed. Thereby, the restriction on the axial movement of the positioning liner 80 fitted and stored inside the tip outer cylinder 10 is released.

[0169] Next, as a positioning liner detachment step S2, as shown in FIGS. 10(a) and 10(b), the operator removes the resin plate 18 from the positioning liner 80 and removes the positioning liner 80 from the tip outer cylinder 10.

[0170] The removal of the positioning liner 80 is performed by sliding the positioning liner 80 inside the tip outer cylinder 10 axially forward while releasing the spline engagement between the engagement concavo-convex portion 12 of the tip outer cylinder 10 and the positioning concavo-convex portion 81 of the positioning liner 80.

[0171] Note that the operation of removing the resin plate 18 from the positioning liner 80 may be included in the fixing pin detachment step S1. Also, an operating tool such as a pulling screw can be engaged with the tool engagement hole 86 of the positioning liner 80, and the positioning liner 80 can be moved axially forward via the operating tool and removed from the tip outer cylinder 10.

[0172] Next, as shown in FIG. 11(a), the operator performs a front plate - blade body detachment step S3. In a state where the positioning liner 80 is removed from the tip outer cylinder 10, the front plate 70 in the back plate storage portion 14 of the tip outer cylinder 10 is released from the circumferential restriction and is rotatable.

[0173] Regarding the front plate 70 whose circumferential restriction has been released, the operator holds the tip portions of the pair of single blades 30, 30' and spreads them apart in the insertion hole 70b, and engages the projecting piece portions 33, 33' at the base ends of the single blades 30, 30' with the rear surface of the front plate 70.

[0174]

[0174]

[0175]

[0176] (5) Installation operation of the blade body The installation operation of the blade body 3 is performed in the reverse order of the removal operation of the blade body 3, i.e., the front plate - blade body detachment step S3 → the positioning liner detachment step S2 → the fixing pin detachment step S1. When attaching the blade body 3 to the distal outer cylinder 10, the operator places the base of the new blade body 3 inside the distal outer cylinder 10 as the front plate - blade body detachment step S3.

[0177] Specifically, the blade body 3 is inserted through the insertion hole 70b of the front plate 70 and combined in advance. Next, as shown in FIGS. 10(b), 11(a), 13(a) and 13(b), the projecting pieces 33, 33' of the pair of blade units 30, 30' are housed together with the front plate 70 in the small cylinder portion 101 of the distal outer cylinder 10. At this time, the sliding surfaces of the pair of blade units 30, 30' are in a facing state with the tapered surface of the arrow main body portion 40 protruding from the arrow body insertion hole 91 of the back plate 90.

[0178] ​Also, as shown in FIGS. 6(b) to 7(a), the front plate 70 is housed and arranged in the front plate housing portion 13 of the front end outer cylinder body 10. That is, in the axial direction view, the engaging concave and convex portions 71 of the front plate 70 are positioned in a reverse phase with respect to the engaging concave and convex portions 12 of the front end outer cylinder body 10. While engaging the engaging concave and convex portions 71 and the engaging concave and convex portions 12 with each other in a male-female fitting manner, the front plate 70 is moved to the rear side in the axial direction of the front end outer cylinder body 10 to house the front plate 70 in the front plate housing portion 13.

[0179] Next, with the front plate 70 arranged in the front plate housing portion 13, it is rotated (rotated 45° about the axis center). As shown in FIG. 6(c), the engaging concave and convex portions 71 of the front plate 70 are positioned in the same phase with respect to the engaging concave and convex portions 12 of the front end outer cylinder body 10, and the engaging concave and convex portions 71 and the engaging concave and convex portions 12 are made to face each other in the axial direction and engage with each other.

[0180] Specifically, the operator grips the tip portions of the pair of blade units 30, 30' and spreads them apart in the insertion hole 70b to engage the blade units 30, 30' with the front plate 70 and rotate the front plate 70 within the front plate housing portion 13.

[0181] Thereby, the front plate 70 is restricted in its axial movement in the front plate housing portion 13 by the engaging concave and convex portions 12 of the front end outer cylinder body 10 and the front end portion 101a of the small cylinder portion 101, and the engaging concave and convex portions 71 and the engaging concave and convex portions 12 of the front end outer cylinder body 10 form a spline groove into which the positioning concave and convex portions 81 of the positioning liner 80 are fitted.

[0182] Next, as the positioning liner detachment / attachment step S2, the operator houses and arranges the positioning liner 80 inside the front end outer cylinder body 10. Specifically, as shown in FIGS. 10(a), 10(b), and 13(b), while inserting the blade body 3 and the arrow body 4 through the insertion hole 80b of the positioning liner 80, the positioning concave and convex portions 81 are inserted and fitted into the spline groove formed inside the front end outer cylinder body 10 by the engaging concave and convex portions 71 of the front plate 70 and the engaging concave and convex portions 12 of the front end outer cylinder body 10.

[0183] In such a state, inside the large cylinder part 100 of the tip outer cylinder body 10, as shown in FIG. 9, a spring fitting part 32 and a projecting piece part 33, which are the bases of the blade body 3, a front plate 70, and a positioning liner 80 are arranged. The front plate 70 restricts rotation in the circumferential direction within the front plate housing part 13 and holds the blade body 3.

[0184] Further, the spring holes 82, 82' of the positioning liner 80 communicate with the spring holes 15, 15' of the tip outer cylinder body 10, and the pin engaging grooves 83, 83' of the positioning liner 80 communicate with the pin insertion holes 17, 17' of the tip outer cylinder body 10, respectively.

[0185] A resin plate 18 is attached to such a positioning liner 80. Note that the operation of attaching the resin plate 18 to the positioning liner 80 may be included in the front plate - blade body detachment / attachment step S3 or may be included in the fixing pin detachment / attachment step S1.

[0186] Next, as shown in FIG. 14(a), as the fixing pin detachment / attachment step S1, the operator attaches the fixing pins 85, 85' from the outside of the tip outer cylinder body 10. Specifically, the positioning protrusions 841, 841' of the positioning plate 84 are inserted into the pin insertion holes 17, 17' of the tip outer cylinder body 10, respectively, and the tip ends of the positioning protrusions 841, 841' are engaged with the pin engaging grooves 83, 83' of the internal positioning liner 80.

[0187] Also, springs 34, 34' are inserted into spring holes 840, 840' that communicate with the spring holes 15, 15' of the tip outer cylinder body 10 and the spring holes 82, 82' of the positioning liner 80 at the centers of the positioning plates 84, 84'. At this time, the fixing pins 85, 85' are attached to the bases of the springs 34, 34'.

[0188] Finally, while pressing the springs 34, 34', the fixing pins 85, 85' are pushed into the spring holes 15, 15' of the tip outer cylinder body 10, and the fixing pins 85, 85' are engaged with the tip outer cylinder body 10.

[0189] That is, the tip portions of the springs 34 and 34' are inserted into the spring fitting portions 32 and 32' of the pair of single vane members 30 and 30' disposed inside the tip outer cylinder 10, and while compressing the springs 34 and 34', the fixing pins 85 and 85' are pushed into the spring holes 15 and 15' of the tip outer cylinder 10.

[0190] In such a state, by rotating the fixing pins 85 and 85', as shown in FIGS. 8(b) and 9, the engaging protrusions 851 and 851' formed to protrude at the middle portions of the body portions 850 and 850' of the fixing pins 85 and 85' are engaged with the pin locking grooves 16 and 16' formed at the middle portions of the spring holes 15 and 15' of the tip outer cylinder 10.

[0191] The positioning plates 84 and 84' are mounted and fixed to the outside of the tip outer cylinder 10 by the fixing pins 85 and 85' engaged with the tip outer cylinder 10, and the positioning liner 80 is fixed to the inside of the tip outer cylinder 10, and the restoring forces of the opposing springs 34 and 34' are transmitted to the pair of single vane members 30 and 30' respectively to bias them for closing. Thereby, the assembly work of the crushing mechanism A1 when attaching the vane body 3 as shown in FIG. 14(b) is completed.

[0192] In this way, while the crushing mechanism case 1 and the actuator 2 are integrally connected, the vane body 3 of the stone cutter packer A can be replaced, etc. That is, when removing the vane body 3, the positioning liner 80, the front plate 70, and the vane body 3 can be sequentially removed from the front tip outer cylinder 10.

[0193] Also, when assembling the vane body 3, a new vane body 3 can be held in the tip outer cylinder 10 simply by inserting a new vane body 3, a front plate 70, and a positioning liner 80 into the tip outer cylinder 10 in the reverse procedure. That is, the replacement work of the vane body 3 can be easily performed from the front opening of the tip outer cylinder 10 without performing the separation and assembly work of the crushing mechanism case 1 and the actuator 2, which was essential in the past when removing the vane body 3.

[0194] [4. Disassembly and assembly work of the crushing mechanism when removing and attaching the arrow body] Next, the disassembly and assembly operations of the crushing mechanism A1 in the stone-breaking packer A when the arrow body 4 is removed and attached will be described. The removal and attachment operations of the arrow body 4 consist of a series of six steps, namely, in addition to the above-described fixed pin detachment step S1, positioning liner detachment step S2, and front plate and blade body detachment step S3, the front handle detachment step S4, the clevis pin detachment step S5, and the back plate and arrow body attachment / detachment step S6. Hereinafter, the outlines of each step S4 to S6, as well as the removal and attachment operations of the arrow body 4, will be described in detail.

[0195] (1) Front handle detachment step S4 The front handle detachment step S4 is a step of detaching the front handle 6 from the crushing mechanism case 1 or attaching it to the crushing mechanism case 1, and is the first step performed during the removal operation of the arrow body 4 or the last step performed during the attachment operation.

[0196] Specifically, in this step S4, for the front handle 6, the front gripping portion 61 and the front fixing portion 62 are vertically divided or joined to open or close the upper pin insertion port 1b and the lower pin insertion port 1b' through which the clevis pin 24 leading to the inside of the crushing mechanism case 1 is inserted and removed. Note that this step S4 may be executed before or after any one of the above-described fixed pin detachment step S1, positioning liner detachment step S2, and front plate and blade body detachment step S3.

[0197] (2) Clevis pin detachment step S5 The clevis pin detachment step S5 is a step of detaching or attaching the clevis pin 24 to the tip of the actuator 2 inside the crushing mechanism case 1 and the base end of the arrow body 4, and is an intermediate step performed during the removal or attachment operation of the arrow body 4. This step S5 includes the removal and attachment operations of the clevis pin 24 as well as the removal and attachment operations of the retaining ring 25.

[0198] Specifically, in this step S5, a clevis pin 24 is removed and inserted into the clevis hole 41a of the connecting part 41 at the base end of the arrow body 4 and the clevis holes 22b, 22b' of the upper clevis piece 22a and the lower clevis piece 22a' at the tip of the actuator 2 communicating therewith, to separate and connect the arrow body 4 and the actuator 2.

[0199] (3) Back plate - arrow body detachment step S6 The back plate - arrow body detachment step S6 is a step of detaching the back plate 90 from inside the tip outer cylinder 10 or mounting it inside the tip outer cylinder 10, and detaching the arrow body 4 from the actuator 2 in the crushing mechanism case 1 or connecting it to the actuator 2. It is the last step performed during the removal operation of the arrow body 4 or the first step performed during the installation operation. This step includes the removal and installation operations of the back plate locking pins 93, 93' to the back plate 90 inside the tip outer cylinder 10.

[0200] Specifically, in this step S6, the back plate 90 and the back plate locking pins 93, 93' are released or engaged, the back plate 90 is detached from or arranged in the back plate storage part 14, and the arrow body 4 is removed from inside the crushing mechanism case 1 or held inside the crushing mechanism case 1.

[0201] (4) Removal operation of the arrow body When performing the removal operation of the arrow body 4, as shown in Fig. 11(b), the operator first removes the front handle 6 from the crushing mechanism case 1 and the actuator 2 as the front handle detachment step S4, and opens the upper pin insertion port 1b and the lower pin insertion port 1b' formed at the rear of the crushing mechanism case 1.

[0202] When removing the arrow body 4 from the crushing mechanism case 1, as shown in Fig. 11(b), the operator first removes the front handle 6 from the crushing mechanism case 1 and the actuator 2 as the front handle detachment step S4, and opens the upper pin insertion port 1b and the lower pin insertion port 1b' formed at the rear of the crushing mechanism case 1.

[0203] Next, as the clevis pin detachment step S5, as shown in Fig. 12(a), the clevis pin 24 that connects the base end portion of the arrow body 4 and the tip end portion of the actuator 2 is removed through the upper pin insertion port 1b and the lower pin insertion port 1b'. At this time, the actuator 2 is positioned at the most retracted position.

[0204] Specifically, the retaining ring 25 above the clevis pin 24 inside the crushing mechanism case 1 is removed from the upper pin insertion port 1b. Then, the clevis pin 24 inserted through the clevis hole 41a of the connecting portion 41 of the arrow body 4 and the clevis holes 22b, 22b' of the clevis pieces 22a, 22a of the actuator 2 above and below it is removed from the upper pin insertion port 1b or the lower pin insertion port 1b' of the crushing mechanism case 1. Thereby, the connection between the arrow body 4 and the actuator 2 is released.

[0205] Next, as the back plate - arrow body detachment step S6, as shown in Figs. 12(b) and 12(c), the back plate 90 inside the tip outer cylinder 10 and the arrow body 4 inside the crushing mechanism case 1 are taken out from the front - side opening of the tip outer cylinder 10.

[0206] Specifically, as shown in Fig. 12(a), the back - plate locking pins 93, 93' are removed from the tip outer cylinder 10 to release the engagement between the back plate 90 and the tip outer cylinder 10. Then, the operator grips the tip portion of the arrow body 4 and pulls it axially forward, removes the connecting portion 41 sandwiched between the clevis pieces 22a, 22a at the tip of the actuator 2, and removes the arrow body 4 from the tip of the actuator 2.

[0207] Furthermore, when the arrow body 4 is pulled axially forward, as shown in Figs. 12(b) and 12(c), the connecting portion 41 of the arrow body 4 engages with the back plate 90, and the back plate 90 follows the arrow body 4 and comes out of the back - plate storage portion 14. Finally, the back plate 90 and the arrow body 4 can be removed from the front - side opening of the tip outer cylinder 10.

[0208] (5) Mounting operation of the arrow body The attachment operation of the projectile body 4 is carried out in the reverse order of the removal operation of the projectile body 4. That is, the back plate-projectile body detachment process S6 → the clevis pin detachment process S5 → the front handle detachment process S4 → the front plate-blade body detachment process S3 → the positioning liner detachment process S2 → the fixing pin detachment process S1 are carried out in sequence.

[0209] As the back plate-projectile body detachment process S6, as shown in FIGS. 12(a) and 12(b), the operator inserts the projectile body 4 into the inside of the crusher mechanism case 1 from the front opening of the tip outer cylinder body 10, and clamps the connecting portion 41 of the projectile body 4 between the upper and lower clevis pieces 22a, 22a at the tip of the actuator 2. In such a state, the clevis hole 41a of the projectile body 4 communicates with the clevis holes 22b, 22b' of the clevis pieces 22a, 22a at the tip of the actuator 2.

[0210] Also, as shown in FIG. 12(a), while inserting the projectile body portion 40 of the projectile body 4 into the projectile body insertion hole 91 of the back plate 90, the back plate 90 is stored and installed in the back plate storage portion 14 of the tip outer cylinder body 10. Then, the back plate locking pins 93, 93' are inserted into the pin insertion holes 101b, 101b' to engage and fix the back plate 90 inside the tip outer cylinder body 10.

[0211] Next, as the clevis pin detachment process S5, as shown in FIG. 12(a), the operator inserts the clevis pin 24 through the pin insertion ports 1b, 1b' formed in the crusher mechanism case 1, and inserts the clevis pin 24 through the communicating clevis holes 41a, 22b, 22b' of the projectile body 4 and the actuator 2.

[0212] Thereafter, a retaining ring 25 is externally fitted and fixed to the upper part of the clevis pin 24 in the inserted state in each of the clevis holes 41a, 22b, 22b'. In this way, the connecting portion 41 of the projectile body 4 inside the crusher mechanism case 1 and the tip portion of the actuator 2 are connected and fixed.

[0213] Next, as the front handle detachment process S4, as shown in FIG. 11(b), the operator assembles the vertically divided front grip portion 61 and the front fixing portion 62, and attaches the front handle 6 to the crusher mechanism case 1. As a result, as shown in FIG. 11(a), the upper pin insertion port 1b and the lower pin insertion port 1b' at the rear part of the crusher mechanism case 1 are blocked.

[0214] Finally, as the above-described (5) vane body attachment work, the front plate-vane body detachment process S3, the positioning liner detachment process S2, and the fixing pin detachment process S1 are sequentially performed to complete the attachment work of the projectile 4. Note that this process S4 may be performed after the (5) vane body attachment work.

[0215] As described above, in the assembly structure of the crushing mechanism of the stone cutter packer according to the present invention, unlike the conventional stone cutter packer, without using a variety of and a plurality of continuously provided fixing members such as frame members and fastening members for holding the vane body and the projectile, or separating and assembling the actuator and the crusher mechanism case, the vane body and the projectile can be mounted inside the crusher mechanism case from the tip opening of the crusher mechanism case.

[0216] That is, without requiring special skills from the operator, at the tip of the crusher mechanism case, by simply assembling the tip outer cylinder, the front liner, and the positioning liner so as to be inserted and engaged with each other, the relative positioning of the vane body and the projectile with respect to the crusher mechanism case can be easily achieved, and after the assembly work, the vane body and the projectile can be stably and firmly held at a predetermined position of the crusher mechanism case.

[0217] Therefore, even if member damage occurs due to wear or buckling of the vane body or the projectile due to repeated use, anyone can easily and quickly perform the assembly work of replacing them with new vane bodies or projectiles, and there is an effect of dramatically improving the work efficiency. Further, when the stone cutter packer is used, there is an effect of stabilizing the reproducibility of the operation of correctly generating the wedge action every time and stabilizing the stone cutting function as an original packer.

[0218] In addition, inside the tip outer cylinder at the tip of the crushing mechanism case, since the front liner and the positioning liner are densely arranged around the base of the blade body, the front liner and the positioning liner receive the expanding pressing action applied to the crushing mechanism case by the expanding and closing actions of the arrow blades accompanying the advancing or retracting operation of the central arrow body, and it is possible to prevent the crushing mechanism case from suffering buckling damage. Therefore, there is an effect that the device life of the packer can be extended.

[0219] That is, the present invention performs a combination of engaging concave and convex portions of constituent members without using any connecting and fixing members such as screws in the assembly of the crushing mechanism, and then, as a final working process, uses a tightening fixing pin to connect and fix one engaging portion in all members, thereby providing an assembly structure of the crushing mechanism in a rock-breaking packer that can smoothly solve conventional problems.

Explanation of Reference Numerals

[0220] A Rock-breaking packer, A1 Crushing mechanism, 1 Crushing mechanism case, 10 Tip outer cylinder, 10b Insertion hole (cylindrical hole), 11 Case main body portion, 12 Engaging concave and convex portions, 13 Front plate storage portion, 14 Back plate storage portion, 15 Spring hole, 16 Pin locking groove, 17 Pin insertion hole, 18 Resin plate, 2 Actuator, 20 Hydraulic cylinder, 21 Cylinder tube, 22 Piston rod, 23 Coupler, 24 Clevis pin, 3 Blade body, 30 Single blade, 31 Blade main body portion, 32 Spring fitting portion, 33 Projection piece portion, 34 Spring, 5 Lock nut, 6 Handle, 70 Front plate, 70b Insertion hole, 71 Engaging concave and convex portions, 72 Liner inner fitting portion, 80 Positioning liner, 80b Insertion hole, 81 Positioning concave and convex portions, 82 Spring hole, 83 Pin engaging groove, 84 Positioning plate, 840 Spring hole, 841 Positioning projection, 90 Back plate, 91 Arrow body insertion hole, 92 Engaging groove

Claims

1. A rock splitting packer configured to house a crushing mechanism comprising a blade body and an arrow body in a cylindrical crushing mechanism case, wherein the blade body is composed of a pair of blade units that can be inserted into a rock during drilling and are configured to be expandable, and the arrow body is composed of a tapered rod body that is connected to an actuator provided at the rear of the crushing mechanism case so as to be able to move forward and backward, and the rock splitting packer is configured such that by pressing the arrow body between the pair of blade units, the blade body is expanded to crush the rock at the drilling position. The crushing mechanism in the crushing mechanism case is at the tip of the crushing mechanism case, a hollow tip outer cylinder with engaging concave and convex portions formed on the inner peripheral surface, a front plate disposed inside the tip outer cylinder and having engaging concave and convex portions on the outer peripheral surface that can engage with the engaging concave and convex portions, a positioning liner disposed inside the tip outer cylinder in close contact with the front plate and having positioning concave and convex portions on the outer peripheral surface that can engage with the engaging concave and convex portions of the tip outer cylinder and the engaging concave and convex portions of the front plate, and is configured to be more assemblable, and moreover, the tip outer cylinder, the front plate, and the positioning liner form an insertion hole at the center through which the blade body and the arrow body are inserted, and further, a pair of spring holes for inserting a spring for biasing and closing the expandable blade body are formed in the opposing portions of the peripheral wall of the tip outer cylinder, and a pair of fixing pins for pressing and fixing the bases of the springs respectively inserted into the pair of spring holes are detachably mounted on the opposing portions of the peripheral wall. The assembly structure of the crushing mechanism in the rock splitting packer.

2. It includes a pair of positioning plates mounted from the outer peripheral side to the opposing portions of the peripheral wall of the tip outer cylinder, and the positioning plates have spring holes communicating with the spring holes of the tip outer cylinder, and positioning protrusions that engage with the outer peripheral side of the positioning liner disposed inside the tip outer cylinder. The assembling structure of the crushing mechanism in the stone cutting packer according to claim 1, wherein the tip outer cylinder body is provided with an insertion hole through which the positioning protrusion is inserted.

3. It is disposed inside the tip outer cylinder body, has an arrow body insertion hole that communicates with the insertion holes of the tip outer cylinder body, the front plate, and the positioning liner and through which the arrow body is inserted, The assembling structure of the crushing mechanism in the stone cutting packer according to claim 1, characterized by comprising a back plate for guiding the advancement of the arrow body.

4. The tip end of the actuator and the base end of the arrow body have a clevis structure in which they are male-female fitted to each other and connected by a clevis pin, The assembling structure of the crushing mechanism in the stone cutting packer according to claim 1, characterized in that a pin insertion port for inserting the clevis pin is opened in the peripheral wall portion of the crushing mechanism case.

Images