JP4122502B2 - Enlarged wing closure holding device for fluid pressure cylinder type expansion head - Google Patents

Description

  According to the present invention, in the fluid pressure cylinder type expansion head in which only the expansion blade is expanded by driving the fluid pressure cylinder and the expansion blade is closed or contracted by other external force, the expansion blade is held in a closed state. It is related with the apparatus to do.

  2. Description of the Related Art Conventionally, for example, as a hydraulic cylinder type expansion head, an expansion blade is supported on an outer peripheral surface of a head rod having an excavation head at the lower end so as to be able to expand and contract freely on the longitudinal plane of the head rod, and hydraulic pressure is provided in the head rod. Various types of structures have been developed in which a cylinder is housed and the expansion blades are both expanded and closed by driving the cylinder to extend and contract.

  However, in the conventional expansion head as described above, a regular hydraulic apparatus including a pipe for returning pressure oil from the hydraulic cylinder to the hydraulic tank at the same time as supplying pressure oil to the hydraulic cylinder, and a hydraulic circuit and a control circuit associated therewith Therefore, not only the equipment cost is increased, but also impurities are mixed in the hydraulic circuit during the excavation rod addition work, which causes a risk of causing malfunction of the hydraulic equipment.

  In order to improve this, the present inventors previously installed a hydraulic cylinder in the head rod, and fitted an outer cylinder having an excavation head at the lower end of the head rod so as to be able to advance and retreat in the axial direction. The expansion blade is pivotally supported on the outer cylinder so that the expansion and contraction can be expanded and contracted on the longitudinal plane of the head rod by expansion and contraction of the hydraulic cylinder, and when the expansion blade is expanded by the supply of pressure water to the hydraulic cylinder, Water is discharged out of the cylinder through the discharge port, whereby only the expansion blade is expanded by the hydraulic cylinder, and the expansion blade is closed or contracted by the weight of the excavation head or the like. Develop,

  Furthermore, as an equipment to be mounted on the expansion head, the expansion blade closed by the weight of the excavation head or the like is securely held in the closed position, and at the next expansion by the hydraulic cylinder, the holding is immediately released. Proposed an expansion blade closure / retention device (pending, Japanese Patent Application No. 2005-8483).

  That is, an annular holding frame is rotatably fitted to the head rod, and the holding frame opens a guide port through which the enlarged blade tip can be moved in and out on the annular peripheral surface. A standby space that faces the guide port and a holding space that does not face the guide port in the forward rotation direction thereof are provided, and a guide plate that guides the enlarged blade tip into the standby space is provided at the guide port edge, and The holding frame has a structure in which an earth pressure receiving plate for protruding the holding frame to suppress the rotation of the holding frame by earth pressure is projected, and in use, the tip of the enlarged blade that is closed and contracted is placed in the holding space of the holding frame. During the forward excavation by the excavation head, the pressure receiving plate receives earth pressure and suppresses the rotation of the holding frame, so that the tip of the enlarged blade enters the inner part of the holding space and maintains a closed state. Then expand to expand the wings When the head is reversed, the tip of the magnifying blade moves from the holding space to the standby space while leaving the holding frame stationary, and when the pressure water is supplied to the cylinder there, the magnifying blade separates from the holding frame and expands. At the same time, the pressure water in the cylinder is discharged from the discharge port, where the pressure water is continuously supplied to the cylinder, and the expansion wing is expanded while maintaining the expansion of the expansion blade, and after the expansion drilling and grout injection, If the pressure water supply path is opened while continuing the reverse rotation of the expansion head, the expansion blade is closed and contracted by the weight of the excavation head and the like, and the holding frame is in a stationary state due to the earth pressure on the pressure receiving plate. The leading end of the magnifying glass is guided by the guide plate and enters the standby space, and then the leading end of the magnifying blade enters the holding space and is held closed by the forward rotation of the magnifying head, where the magnifying head is raised to the ground. .

  As described above, in the above-described enlarged blade closure / retention holding device, as a means for keeping the holding frame stationary for each of the above-described purposes, the earth pressure of the excavated earth and sand is applied to the pressure receiving plate in the excavation hole. The system that suppresses the rotation is adopted.

  However, there are significant differences in the nature and amount of excavated soil depending on the ground and the type of excavator used, and as a result, there is a significant variation in the static action that the pressure-receiving plate receives from the excavated soil, resulting in the holding frame being stationary. There was a drawback that reliability and quick response were poor.

  In the first invention of the present application, in the expansion and contraction of the expansion blade, the expansion blade can reliably and promptly perform the holding in the closed position of the expansion blade and the release of the above closed and contraction holding for the expansion. Provided is a blade closure holding device.

  It is an object of the second invention of the present application to make it possible to more immediately hold the expansion blade in the closed / contracted position.

As means for solving the above problems, the first invention of the present application is:
In the expansion head, the expansion blade is expanded by driving the fluid pressure cylinder, and the expansion blade is closed and contracted by other external force.
The head rod is connected to the upper drive rod and the lower driven rod having the excavation head at the lower end portion so as to be rotatable by a fixed release angle about the axis.
On the outer periphery of the lower driven rod, the expansion wing is pivotally supported so as to freely expand and contract on the head rod longitudinal plane,
Attach a holding member to the upper drive rod to hold the enlarged wing in an unexpandable state by engaging with the outside of the tip of the enlarged wing at the time of closing.
When the upper drive rod rotates in one direction with respect to the lower driven rod, the holding member is locked to the outer end of the enlarged blade at the time of closing and the upper drive rod is moved in the other direction with respect to the lower driven rod. When the release angle rotates, it is in a positional relationship to rotate to a position to release the locking.
We propose an expansion blade closure holding device for a hydraulic cylinder expansion head.

The second invention of the present application is
The holding member according to the first aspect of the present invention further repels the holding member at all times in the locking direction and resists the expansion of the holding member at the leading end of the expanding blade at the time of closing and swinging of the expanding blade. A spring member that can be swung inside the holding member;
We propose an expansion blade closure holding device for a hydraulic cylinder expansion head.

  According to the first invention of the present application, when the expansion blade is closed and closed, the holding member is immediately unlocked by rotating the upper drive rod in the other direction at the release angle while pressing the excavation head of the lower driven rod against the ground. Therefore, if the upper drive rod is rotated by a release angle in one direction after closing and swinging the expansion blade, the expansion blade can be held unexpandable by the holding member. When the upper drive rod is rotated in the other direction by the release angle while the excavation head of the lower follower rod is pressed against the ground, the holding member releases the hold on the tip of the expansion blade and expands. The blade can be immediately put into a state where the blade can be expanded, so that the blade can be surely expanded immediately when the blade is expanded and swung by driving the fluid pressure cylinder.

  Furthermore, since the holding member of the present invention is small enough to be locked to the tip of the enlarged blade, the large holding frame of the conventional holding device is an obstacle to the transport and movement of excavated earth and sand in the hole during excavation. It has the advantage of overcoming that difficulty.

  According to the second invention of the present application, in addition to the effect of the first invention, when the expansion blade is closed and contracted, the expansion blade is closed and swung while the holding member is kept in the locking position with respect to the expansion blade. The front end portion can immediately enter the inside of the holding member against the impact of the spring member of the holding member, so that the enlarged wing can be immediately held in the closed / contracted position by the holding member. It is.

For convenience embodiment of the second invention will be explained from the examples of the present second invention. 1 (a) and 1 (b), the head rod of the enlarged head (H) is composed of an upper drive rod (1) and a lower driven rod (2), and one upper drive rod (1) is located inside. A cylindrical body having a shaft hole (3) having a lower end opening, and in this example, a release groove (4) having an opening angle of about 65 degrees is recessed on the inner peripheral surface of the shaft hole (3). The driven rod (2) has a guide cylinder (6) with a lower end opening continuously connected to the lower end of a hollow shaft (5) with an upper end opening on the same axis, and a key is attached to the outer peripheral surface of the hollow shaft (5). (7) is fixed, the hollow shaft (5) is rotatably fitted in the shaft hole (3) of the drive rod (1), and the key (7) is engaged in the release groove (4). The angle at which the drive rod (1) and the driven rod (2) can be rotated by the key (7) in the release groove (4). It is connected for rotation (hereinafter referred to as release angle) only. The release angle is 45 degrees in this example.

  The guide cylinder (6) of the driven rod (2) is internally provided with a piston-fixed hydraulic cylinder in this example. First, a hydraulic cylinder tube having a piston (9) in the guide cylinder (6). (8) is slidably fitted in the axial direction, and the outer cylinder (10) slidably fitted on the lower end surface of the tube (8) at the lower part of the guide cylinder (6) is bolted ( 11)... (12)... And a heavy drilling head (13) made of double spiral blades having a bit (14)... It is.

  As a fixing structure of the piston (9), each of a piston rod and grout supply pipe (16) at the center of the lower surface of the upper plate (15) of the guide cylinder (6) and a pressure water supply pipe (17) on the lower surface side. The upper end portions are fixed and suspended, and the lower end portions of these pipes (16) and (17) penetrate the upper end wall of the cylinder tube (8) so as to slide into the tube (8). The entry end of the grout supply pipe (16) is fixed to the piston (9) in a penetrating state, and the entry end of the pressure water supply pipe (17) is fixed to the piston (9) in an embedded state.

  (18) is a grout supply auxiliary pipe, and its upper end is slidably inserted into the grout supply pipe (16), and its lower end is inserted into a grout injection port (19 on the lower end surface of the outer cylinder (10). ).

  (20) is a pressure water supply port provided on the side wall of the lower end of the pressure water supply pipe (17), and opens to the rod side space in the cylinder tube (8).

  As a means for releasing the pressure water in the cylinder tube (8), the piston (9) of the piston (9) when the tube (8) is raised to the uppermost position as shown in FIG. The discharge ports (21) and (21) are opened at a position slightly above the upper surface, and the outer tube (10) together with the tube (8) is formed on each peripheral wall of the guide tube (6) and the outer tube (10). In addition, the discharge ports (22), (22), (23), and (23) are respectively opened at positions that coincide with the discharge ports (21) and (21) when they are raised to the top.

  The expansion / contraction structure of the expansion blades (24) and (24) is as follows. Brackets (25) and (25) are projected from the outer peripheral surface of the outer cylinder (10) in the diametrical direction, and the bases of the enlarged wings (24) and (24) are provided on the bracket, and the longitudinal plane of the head rod is provided. It is supported by shafts (26) and (26) so as to be able to swing upward, and brackets (27) and (27) are projected from the outer peripheral surface of the guide tube (6). , (28) is supported by shafts (29) and (29) and the other end of the link is supported by shafts (30) and (30) at the intermediate portion of the enlarged wings (24) and (24). It is connected.

  In the structure as described above, when the enlarged wings (24) and (24) stand up substantially vertically and close as shown in FIG. 1 (a), their tips (P) and (P) are driven. Although it comes into contact with the outer peripheral surface of the rod (1), holding devices (S) and (S) are arranged at the contact positions of the tip portions (P) and (P), respectively. As for one of them, as shown in FIGS. 3 and 4, a part of the double helix blade on the outer peripheral surface of the upper drive rod (1) is cut out, and the drive rod (1) The arm (31) projects in the radial direction, and a pair of plate brackets (33), (34) project in parallel to each other on the outer surface of the support plate (32) fixed to the tip of the arm (31). The holding lever (35) is supported by one bracket (33).

  The holding lever (35) is composed of a holding claw (36) and a bifurcated tail (37) extending in the shape of a dog-tooth, and the holding claw (36) is an enlarged wing ( The outer surface of the claw tip is formed on the inclined surface (38).

  As shown in FIG. 5, the hollow shaft (39) is fixed in a penetrating state at the bent middle portion of the holding lever (35), and a torsion spring (40) is inserted into the hollow shaft (39). A lid (41) is fixed to one end of the opening of the shaft (39) with bolts (42), and a bifurcated stopper projecting from the inner surface of the lid (41) is attached to one end of the torsion spring (40). It is locked to.

  The hollow shaft (39) of the holding lever (35) as described above is rotatably supported by the plate-like brackets (33) and (34), while a lid (43 is provided at the other open end of the hollow shaft (39). ), And a bifurcated stopper projecting on the inner surface of the lid (43) is locked to the other end of the torsion spring (40), and a bolt (45) to the bracket (34). The cap (44) fixed in (4) is fixed to the lid (43) with bolts (46).

  In this case, a slight twist is applied to the spring (40) in advance, and the holding claw (36) is moved with the tail (37) pressed against the support plate (32) by the repulsive force of the screw (40). The expansion blade (24) is constantly bulleted outward while being suspended on the closed and swinging orbit of the tip (P).

  The other holding device (S) has the same structure as described above.

  In this example, when the pressure water in the cylinder tube (8) is discharged, the expansion blades (24) and (24) can be closed and swung by the weight of the excavation head (13), etc. The oscillating enlarged blade tips (P) and (P) are held while oscillating the holding claws to the inner position shown by phantom lines in FIG. 3 against the elastic force of the holding claws (36) and (36). The resilience of the holding claws is adjusted so as to enter the inside of the claws (36) and (36).

  Further, in the relationship between the holding claws (36) and (36) and the release groove (4), the key (7) is moved in the forward end of the release groove (4) by the forward rotation of the drive rod (1). 4a), the holding claws (36), (36) are on the closed swinging orbit of the enlarged blade tips (P), (P), and the drive rod (1) is reversed. When the key (7) comes into contact with the reverse end (4b) of the release groove (4), the holding claws (36), (36) are the expanding blade tips (P), (P) expanding swinging trajectory. It is in a positional relationship that allows the expansion wings to swing apart.

  In particular, the operation of the enlarged blade holding device (S), (S) in the above example will be described. The expansion head (H) is connected to the lower end of the screw rod (R) in a row. In the state of FIG. 1 in which the expansion wings (24) and (24) are closed and contracted, and the tip portions (P) and (P) are held inside the holding claws (36) and (36), R), the expansion head (H) is rotated forward, and the excavation head (13) starts excavation of the vertical hole in the ground. The holding claws (36) and (36) hold the expanding blades (24) and (24) in the closed state during excavation.

  When the support ground is reached, if the screw rod (R) is slightly reversed (45 degrees) with the excavation head (13) digging into the ground, the lower driven rod (2) is moved to the upper drive rod (1 ) Only 45 degrees reverse, whereby the holding claws (36), (36) release the tips (P), (P) of the expanding blades (24), (24).

  Therefore, the pressure water is sent to the rod side space in the cylinder tube (8) through the supply pipe (17) and the supply port (20) to raise the cylinder tube (8), thereby expanding the wings (24), (24 ). When the expansion blades (24) and (24) are expanded almost horizontally as shown in FIG. 2, the pressure water in the cylinder is discharged from the discharge ports (21), (22) and (23). By continuing the supply and discharge of the cylinder tube to the cylinder tube, the expansion blade is maintained to expand and the excavation is started. At the same time, the grout is supplied to the injection port (19) through the supply pipe (16) and the auxiliary pipe (18). And is mixed with excavated earth and sand to form a soil cement bulb.

  After the bulb formation, when the pressure water supply path is opened and the screw rod (R) is rotated forward, the upper drive rod (1) is rotated forward and the holding claws (36), (36) are expanded to expand the wing (24). , (24) are moved on the closed and swinging orbit of the tip portion (P), (P), and at the same time, the cylinder tube (8) is lowered by the weight of the excavation head (13) and the like, and the expanding blade (24) , (24) is swung in the closing direction. In the final closed position, the enlarged blade tips (P) and (P) push up the holding claws (36) and (36) against the torsion springs (40) and (40), 36), automatically enters the inside of (36), thereby being locked in the closed state.

  With the expansion wings (24), (24) held closed, the screw rod (R) is pulled up to the ground while rotating forward. By the forward rotation, the forward rotation side end (4a) in the release groove (4) of the upper drive rod (1) abuts on the key (7), and the lower driven rod (2) is driven in the same direction. The holding claws (36) and (36) continue to hold the enlarged blade tips (P) and (P) in an unexpandable manner.

Embodiment of the First Invention In this embodiment , the holding claws (36) and (36) are fixed to the brackets (33) and (33) except for the torsion spring (40) of FIG. Are suspended so that they can be locked to the outside of the enlarged wings (24), (24) tip (P), (P) at the time of contraction, and other structures are substantially the same as FIGS. .

  According to this example, when closing the expansion blades (24), (24), the upper drive rod (1) is released with the excavation head (13) of the lower follower rod (2) pressed against the ground. The holding claws (36), (36) are detached from the locking positions with respect to the enlarged blades (24), (24), and the enlarged blades (24), (24) are swung closed and closed in this state. Then, the upper drive rod (1) is rotated forward at the release angle, whereby the holding claws (36), (36) are rotated to the outside of the enlarged blade tips (P), (P) to expand the expanded blade ( 24) and (24) are held in the closed position. When the expansion wings (24), (24) are expanded, the upper drive rod (1) is reversely released to thereby release the holding claws (36), (36) from the locking position. Then, the expansion wings (24) and (24) are swung open and wide by driving the hydraulic cylinder.

  The invention of the present application is not limited to the above embodiments, and any configuration that releases the closed / contracted holding of the enlarged blade by rotating the drive rod in the other direction may be used. Water pressure, hydraulic pressure, pneumatic pressure, etc. This can be applied to a fluid pressure cylinder type expansion head in which the expansion blade is expanded by the fluid pressure cylinder.

(A) It is a vertical front view of the expansion head by this invention. (B) It is an AA cut end view of the above figure (A). It is a lower half vertical front view of the expansion state of an expansion head same as the above. It is an enlarged side view of an enlarged wing closure holding device part. It is a front view same as the above. FIG. 4 is an enlarged sectional view taken along line B-B in FIG. 3.

Explanation of symbols

H Enlarged Blade Closure Holding Device 1 Upper Drive Rod 2 Lower Driven Rod 4 Release Groove 7 Key 8 Hydraulic Cylinder Tube 9 Piston 13 Excavation Head 24 Enlarged Wing 35 Holding Lever 36 Holding Claw 40 Torsion Spring

Claims (2)

In the expansion head, the expansion blade is expanded by driving the fluid pressure cylinder, and the expansion blade is closed and contracted by other external force.
The head rod is connected to the upper drive rod and the lower driven rod having the excavation head at the lower end portion so as to be rotatable by a fixed release angle about the axis.
On the outer periphery of the lower driven rod, the expansion wing is pivotally supported so as to freely expand and contract on the head rod longitudinal plane,
Attach a holding member to the upper drive rod to hold the enlarged wing in an unexpandable state by engaging with the outside of the tip of the enlarged wing at the time of closing.
When the upper drive rod rotates in one direction with respect to the lower driven rod, the holding member is locked to the outer end of the enlarged blade at the time of closing and the upper drive rod is moved in the other direction with respect to the lower driven rod. When the relief angle is rotated, it is in a positional relationship to rotate to a position to release the locking.
Enlarged blade closure holding device in a fluid pressure cylinder type expansion head. Further, the holding member further constantly repels the holding member in the locking direction, and when the expansion wing is closed and swung, the tip of the expansion wing is resisted against the spring of the holding member. It has a spring member that can swing inside,
The expansion blade closed / contracted holding device in the fluid pressure cylinder type expansion head according to claim 1.

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