JPH025498B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a hoop wrench used for bending the ends of hoops and stirrups in reinforced concrete construction.

[Technical background of the invention and its problems]

In general, in reinforced concrete construction, in order to construct the pillars and beams of a building, a large number of reinforcing bars are combined into a network and embedded within the concrete pillars or beams to improve the strength of the pillars and beams. It is planned.

The method of constructing reinforcing bars is to combine multiple main reinforcing bars arranged vertically or horizontally parallel to each other into a band shape, with the ends bent at almost right angles, and then bend the ends of these reinforcing bars further to the main reins. This is done by attaching and fixing by bending (usually about 135 degrees).

This work of bending the ends of the winding bars and wrapping them around the main reinforcement is usually done using a hoop wrench, but conventional hoop wrenches have an arm for bending the winding bars attached to the tip of the rod of a hydraulic cylinder. The structure is such that this arm is swung and bent by supplying pressure oil to a hydraulic cylinder. The pressure oil supplied to this hydraulic cylinder is supplied through a hydraulic hose from a separate oil supply unit equipped with an oil storage tank and a pump.
The water is returned to a separate tank through a hydraulic hose.

Therefore, in construction sites where work is done at a relatively high position or where workers move frequently, there may be problems such as the connected hydraulic hose getting stuck or finding a place to place a separate lubrication unit. There's a problem. Also, when supplying pressure oil to the hydraulic cylinder,
Air holes must be provided in the tank to prevent a vacuum inside the tank, but in work sites where there is a lot of dirt and dust, this can easily lead to foreign matter getting in, clogging, and other malfunctions. Furthermore, in order to remotely control the separately installed refueling unit, a remote control switch and special wiring are required. Further, after the bending operation is performed, the pressure oil in the hydraulic cylinder must be drained and the piston rod must be moved back, but this is done using a manual pressure reducing valve, making the operation complicated. Additionally, if the diameter of the main reinforcement or the bending angle of the winding reinforcement changes, the amount of swing of the arm must be adjusted, but this adjustment is done by adjusting the piston stroke of the hydraulic cylinder. The structure is complicated and operation is troublesome.

[Object of the Invention] The present invention has been made in consideration of these points, and an object of the present invention is to provide a hoop wrench that is easy to handle and has good work efficiency.

[Summary of the invention]

The hoop wrench of the present invention includes an oil tank for storing oil in the casing body of the hoop wrench, and an oil pump mechanism disposed in the casing body to pump pressure oil to a cylinder chamber, and a piston rod slidably arranged in the cylinder chamber. The bending arm is operated by moving the folding arm forward and backward. Further, the hoop wrench according to the present invention has a spool valve mechanism installed therein so that the piston rod can be automatically returned. Further, in the hoop wrench according to the present invention, the mounting position of the main reinforcement receiving member is adjustable, so that even if the main reinforcement diameter or the winding reinforcement bending angle changes, it can be easily adjusted.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional side view of a hoop wrench according to the present invention, and FIG. 2 is a view showing the tip of the hoop wrench according to the present invention as seen from the direction of arrow A in FIG. In the figure, reference numeral 11 is an electric motor, and motor shaft 1
2 is inserted into the casing body 13, and is attached to the casing body 13. An oil tank 14 in which oil is stored is provided inside the casing body 13, and a pump mechanism 15 for pumping the oil in the oil tank 14 is further provided. The pump mechanism 15 includes a cam portion 16 formed at the tip of a motor shaft 12, and a piston 1 that is reciprocated by the cam portion 16 via a needle bearing.
7 and an on-off valve 18 arranged in the oil passage, and this on-off valve 18 is normally adapted to close the oil passage by a spring 19. A cylinder chamber 20 is formed approximately in the center of the casing body 13, and the cylinder chamber 20 and the oil tank 14 are partitioned off by a vertical wall 21. A plurality of pump mechanisms 15 (for example, three) are arranged, and except for one pump mechanism 15 (shown in the upper position in FIG. 1), the other pump mechanisms 15a (indicated by a chain line downward in FIG. 1)
An oil supply path 22 for supplying pressure oil from the vertical wall 21 penetrates the vertical wall 21 and communicates with the cylinder chamber 20 .
The cylinder chamber 20 and the oil tank 14 communicate with each other through a communication passage 23 provided through a vertical wall 21, and a spool valve mechanism 24 is disposed in the middle of this communication passage 23. The spool valve mechanism 24 includes a communication passage 23
The vertical wall 21
A cylindrical cylinder 25 is formed in the cylindrical cylinder 25, and a spool 26 is disposed inside the cylindrical cylinder 25 so as to be slidable in the axial direction with a minute gap (for example, a diameter gap of 0.1 mm) between the cylindrical cylinder 25 and the inner wall of the cylindrical cylinder. , spool 2
6, and a spring 27 disposed inside the cylindrical cylinder 25 so as to come into contact with the tip of the cylindrical cylinder 25. The cylindrical cylinder 25 has a valve seat 28 formed in the middle of a communication passage 23 that communicates the cylinder chamber 20 and the oil tank 14 at a front position, and a valve seat 28 that is formed in the middle of a communication passage 23 that communicates the cylinder chamber 20 and the oil tank 14, and a valve seat 28 that is connected to one of the plurality of pump mechanisms 15 at the rear. A communicating passage 29 is opened. Also, spool 26
A valve body 30 is formed at the tip of the valve body 30 to open and close the valve seat 28 in the cylindrical cylinder 25 . When the pump mechanism 15 is not operating, the spool 26 is pushed up by a spring 27 until its rear end contacts the stopper 31. vertical wall 2
1, an oil return path 32 is formed through the oil tank 14 and the front end of the cylinder chamber 20 (the end opposite to the vertical wall 21). The pressure buffer chamber 34 is branched into a pressure buffer chamber 34 in which a pressure buffer chamber 34 is provided. A pressure buffer chamber 34 is formed within the handle 35 of the hoop wrench. Further, at an appropriate position on the front end side from the middle of the cylinder chamber 20,
A release hole 36 communicating with the pressure buffer chamber 34 is bored.

Inside the cylinder chamber 20, a piston flange 37 is provided.
is arranged to be slidable in the axial direction, and a piston rod 38 is joined to the back surface of this piston flange 37. The piston rod 38 is connected to the front part 13 of the casing body 13 which seals the cylinder chamber 20.
a and protrudes to the outside of the casing body, and a semicircular groove 39 is formed at its tip. A piston flange return spring 40 is disposed between the back surface of the piston flange 37 and the front portion 13a of the casing body 13.

At the tip of the front portion 13a of the casing body 13, the center portion of a winding bar bending arm 41 is pivotably supported on a shaft 42 fixed in a direction orthogonal to the axis of the piston rod 38. This bending arm 41 has a presser claw 43 formed at its tip for bending the coil H, and a connecting pin 44 rotatably inserted into the groove 39 at the tip of the piston rod 38 at its rear end. A main reinforcement receiving portion 45 is also attached to the tip of the front portion 13a of the casing body 13 at a position facing the arm 41. As shown in FIG. 2, the main reinforcement receiving parts 45 are attached to a pair of left and right sides with the arm 41 in between, and have main reinforcement receiving surfaces 45a facing the arm 41. The main reinforcement receiving part 45 connects the winding reinforcement H to the main reinforcement S.
It receives the main reinforcement S when it is wound around the casing body 13, and is fixed to both sides of the front part 13a of the casing body 13 by bolts 46. As shown in FIGS. 3 and 4, anti-slip members 47 having a large number of longitudinal grooves are fixed to both sides of the front portion 13a of the casing body 13, and the main reinforcement receiving portion 45 is attached to the anti-slip member 47. A large number of vertical grooves that engage with this vertical groove are also formed on the surface, and by engaging with each other, the attachment of the main reinforcement receiving part 45 is reinforced, and a large pressing force acts on the main reinforcement receiving surface 45a. The main reinforcement receiving part 45 is prevented from sliding even when the main reinforcement part 45 is moved. Further, the bolt insertion hole of the main reinforcement receiving part 45 is an elongated hole 48, and by loosening the bolt 46, the mounting position of the main reinforcement receiving part 45 can be adjusted by moving toward or away from the arm 41.

Next, the operation of this embodiment having such a configuration will be explained.

First, the end of the winding reinforcement H to be wrapped around the main reinforcement S,
The arm 41 is placed in contact with the main reinforcement S at a predetermined position from the perpendicular direction, and with the main reinforcement receiving surface 45a of the hoop wrench in contact with the main reinforcement S, the arm 41 is placed in contact with the winding reinforcement H. It is arranged so as to be sandwiched between the main reinforcement receiving surface 45 (see Fig. 1). After setting the hoop wrench to the main reinforcement S and winding reinforcement H in this way, the hoop wrench's electric motor 11
Turn on switch 11a. The motor shaft 12 is rotationally driven by the drive of the electric motor 11, and the cam 16
It also rotates. This causes the piston 17 to reciprocate, sucking and compressing the oil in the oil tank 14 to generate pressure oil. The pressure oil generated by the pump mechanism 15 pushes up the on-off valve 18 against the spring 19, and is sent under pressure to the spool valve mechanism 24 through the passage 29, while the pressure oil generated by the other pump mechanism 15a is The oil is fed under pressure into the cylinder chamber 20 through the oil supply path 22. The pressure oil fed to the spool valve mechanism 24 is fed from the rear of the cylindrical cylinder 25 and pushes the spool 26 forward against the spring 27. As the spool 26 advances, the valve body 30 at the tip is inserted into and engaged with the valve seat 28 of the cylindrical cylinder 25, thereby closing the opening of the valve seat 28. As a result, the communication path 23 that communicates the oil tank 14 and the cylinder chamber 20 is blocked and closed. Subsequently, the pressure oil pumped into the cylindrical cylinder 25 from the pump mechanism 15 flows through the gap between the spool 26 and the inner diameter of the cylindrical cylinder 25, and is returned to the oil tank 14 through the communication path 23. As a result, the spool valve mechanism 24
The communication path 23 between the oil tank 14 and the cylinder chamber 20 is maintained in a blocked and closed state.

The pressure oil fed into the cylinder chamber 20 acts on the flange surface of the piston flange 37 and moves the piston flange 37 and the piston rod 38 to the left in FIG. 1 against the return spring 40. As a result, the connecting pin 44 at the rear end of the arm 41 is pushed leftward in FIG. By this swinging of the arm 41, the end of the winding reinforcement H is bent as indicated by the symbol H' in FIG. 1, and is wound around the main reinforcement S.

During this bending work, in order to prevent the arm 41 from swinging too much and winding the winding bar H more than necessary, when the piston flange 37 passes through the release hole 36, the pressure oil in the cylinder chamber 20 is released from the release hole 36.
6, the piston flange 37 and the piston rod 38 are stopped from further advancing.

The piston rod 38 stops moving forward, and the arm 4
When the winding operation by 1 is completed, switch 1
1a, and the operation of the electric motor 11 is stopped.
As a result, the supply of pressure oil from the pump mechanism 15 is stopped, and the spool 26 of the spool valve mechanism 24 is stopped.
is pushed back rearward by the spring 27, and the engagement between the valve body 30 and the valve seat 28 is released. The cylinder chamber 20 and the oil tank 14 are communicated again through the communication passage 23, the pressure oil in the cylinder chamber 20 is returned to the oil tank 14, and the piston flange 37 is pushed back to the right in FIG. 1 by the return spring 40. As a result, the tip of the arm 41 is swung to the left in FIG. 1, the presser claw 43 at the tip is separated from the winding bar H, and the hoop wrench is removed from the location where the main bar S and winding bar H are assembled.

When the diameter of the main reinforcement S and winding reinforcement H changes or the bending angle is changed, the main reinforcement receiving part 45
It is necessary to move and adjust the mounting position. This can be done by loosening the bolts 46 fixing the main reinforcement receiving part 45 to both sides of the front part 13a of the casing body 13, and moving the main reinforcement receiving part 45 in the front-rear direction using the elongated holes 48. can. After moving the main reinforcement receiving part 45 to a predetermined position, when the bolt 46 is tightened, a large number of vertical grooves on the mounting surface engage with each other, and the mounting and fixation are firmly established.

FIG. 5 is a sectional view of a main part showing another embodiment of the present invention. In this embodiment, a spool valve mechanism 50, a cylindrical cylinder 51, a spool 52 that slides in the axial direction within the cylindrical cylinder 51, and a spool 52 disposed in the cylindrical cylinder 51 in front of the spool so as to come into contact with the tip of the spool 52. However, the gap between the spool 52 and the inner diameter of the cylindrical cylinder 51 is not as large as in the embodiment shown in FIG. A hole 54 is formed. Further, the rear end of the spool 52 has a diameter that is one step smaller than near the center, and has a perpendicular hole 55 that communicates with the through hole 54.
is drilled. A communication passage 56a communicating with the cylinder chamber 20 is opened near the center of the cylindrical cylinder 51, and an oil tank 14 is opened in the front position of the cylindrical cylinder 51.
A communication path 56b that communicates with is open. Further, an oil supply passage 29 is opened at the rear of the cylindrical cylinder 51 and communicates with one of the pump mechanisms 15 of the plurality of pump mechanisms. The rest of the structure is the same as that of the embodiment shown in FIG. 1, and therefore is indicated by the same reference numerals.

According to this embodiment, the pressure oil generated by the operation of the pump mechanism 15 is sent to the rear of the cylindrical cylinder 51 through the passage 29 and advances the spool 52 against the spring 53. Spool 5
2 advances, the communication path 56a is closed by the outer peripheral wall of the spool 52, and the cylinder chamber 20 and oil tank 14 are closed.
Communication with is cut off. Subsequently, the pump mechanism 15
The pressure oil fed under pressure enters the through hole 54 through the hole 55, and enters the communication path 5 in front of the cylindrical cylinder.
6b to the oil tank 14, the spool 52
can maintain a state in which the communication path 56a is blocked. As a result, the pressure oil pumped into the cylinder chamber 20 from the other pump mechanism 15a acts on the piston flange 37, causing the piston rod to move to the left in FIG. have them do it.

Switch off the electric motor and pump mechanism 15
When the operation of the spool 52 is stopped, the spool 52 is pushed back rearward again by the action of the spring 53, and the communication path 56a is opened. As a result, the cylinder chamber 20 and the oil tank 14 are communicated with each other, the pressure oil in the cylinder chamber 20 is returned to the oil tank 14, and the return spring 40
As a result, the piston flange 37 is moved to the right in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, since the oil tank and the pump mechanism for piston operation are built into the casing body of the hoop wrench, there is no need for a separate oil supply unit as in the past, and the handling is easy and work is easy. Efficiency can be improved. In addition, a spool valve mechanism is installed between the cylinder chamber and the oil tank,
Since the communication path connecting the cylinder chamber and the oil tank can be automatically shut off and opened, the swinging of the winding bar bending arm can be controlled by simply turning the electric motor switch.
This can be done automatically by simply turning ON and OFF. In addition, since the main reinforcement receiving part is attached so as to be adjustable and movable, even if the diameter of the main reinforcement, winding reinforcement, etc. changes, it can be easily adjusted. Furthermore, a large number of vertical grooves are formed on the mounting surface of the main bar receiver so that they can engage with each other, so even if a large load is applied to the main bar receiver, the main bar receiver will not slip. There isn't. In addition, a release hole is provided at a desired position in the cylinder chamber to allow pressure oil to escape, so the swinging of the arm automatically stops at a predetermined position, preventing the winding strip from being bent too much. .

As described above, according to the present invention, handling of the hoop wrench is easy and work efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a side cross-sectional view of a hoop wrench according to the present invention, Fig. 2 is a view showing the tip of the hoop wrench seen from the direction of arrow A in Fig. 1, and Fig. 3 is a main bar receiving portion seen from the direction of arrow B in Fig. 2. FIG. 4 is a sectional view taken along the line of FIG. 3, and FIG. 5 is a sectional view of main parts showing another embodiment of the present invention. 11...Electric motor, 14...Oil tank, 15,1
5a...Pump mechanism, 20...Cylinder chamber, 2
2, 29... Oil passage, 23... Communication passage, 24...
Spool valve mechanism, 25... Cylindrical cylinder, 26...
...Spool, 27...Spring, 28...Valve seat, 30...Valve body, 36...Release hole, 37...
...Piston flange, 38...Piston rod,
40...Return spring, 41...Arm, 43...Press claw, 45...Main bar receiver, 46...Bolt, 4
7... Anti-slip member, 48... Long hole, 50... Spool valve mechanism, 51... Cylindrical cylinder, 52...
Spool, 53...Spool, 54...Through hole,
56a, 56b...Communication path.

Claims (1)

[Claims] 1. A casing body having an oil tank provided therein;
A plurality of pump mechanisms are arranged in the casing body and pump the oil stored in the oil tank; A cylinder chamber formed in the casing body and supplied with pressure oil from the pump mechanism; A cylinder chamber that slides in the axial direction inside the cylinder chamber; a piston flange which is movably disposed and has a piston rod connected to its back; a piston flange return spring which is disposed within the casing body so as to come into contact with the back of the piston flange; and a passage communicating between the cylinder chamber and the oil tank. a spool valve mechanism disposed in the middle of the casing body, the spool valve mechanism closing the communication passage using pressure oil fed from one of the plurality of pump mechanisms; a winding reinforcement bending arm having a presser claw formed at its tip and a rear end pivotally connected to the tip of the piston rod; a main reinforcement receiving surface attached to the front part of the casing body in a relationship facing the arm; A hoop wrench for wrapping a winding reinforcement around a main reinforcement, comprising: a main reinforcement receiving member; 2. The spool valve mechanism has a valve seat formed in the middle of a passage communicating between the cylinder chamber and the oil tank at the front, and a passage communicating with one of the plurality of pump mechanisms is opened at the rear. a cylindrical cylinder; a spool having a valve body formed at its tip that engages with the valve seat, and disposed within the cylindrical cylinder so as to be slidable in the axial direction with a small gap between the spool and the inner wall of the cylindrical cylinder; The hoop wrench according to claim 1, further comprising: a spring disposed between the valve seat and the spool tip. 3. The spool valve mechanism is a cylindrical cylinder that is formed in the middle of a passage that communicates between the cylinder chamber and the oil tank, and has a passage that communicates with one of the plurality of pump mechanisms at the rear; a spool having an elongated through hole and sliding in the axial direction within the cylindrical cylinder to block and open a passage communicating between the cylinder chamber and the oil tank; The hoop wrench according to claim 1, further comprising: a spring disposed within the cylinder. 4. The hoop wrench according to claim 1, wherein the main reinforcement receiving member is attached so that its attachment position can be adjusted. 5. The hoop wrench according to claim 4, wherein the main reinforcement receiving member is attached to the casing body with bolts, and has an anti-slip unevenness formed on its attachment surface.