JPH0217721Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a device for fixing reinforcing bars and joints for connection construction of reinforcing bars, which connects reinforcing bars via turnbuckles. This invention relates to a novel device for fixing the two together through a sleeve, with a joint having a turnbuckle connection thread abutted against the end of the joint.

[Prior Art] Ram-type steel bar welding machines are well known, as examples thereof are shown in Japanese Patent Publication No. 55-45294 and Japanese Utility Model Publication No. 55-32677. However, devices such as this joining machine that connect reinforcing bars via sleeves using a hydraulically driven ram do not have a switching valve for the hydraulic circuit in the operating part, and as shown in Fig. 7, The actuating part 1 and the hydraulic drive part 2 are provided at separate positions, and the two are connected by hoses 3, 3 to drive the hydraulic pump 4 provided in the hydraulic drive part 2. It was provided in the drive section 2.

In this way, in the conventional device, the switching valve 5 and the hydraulic drive unit 2 are provided at a location apart from the actuating unit 1, so that the worker who directly connects the reinforcing bars and the dedicated worker who operates the hydraulic drive unit are required to operate the hydraulic drive unit. In addition to the disadvantage that it is necessary, the workability is extremely poor. In addition, since the structure is such that high-pressure oil flows through the two hoses 3, 3 that connect the actuating part 1 and the hydraulic drive part 2, a strong and expensive hose must be used, which is not easy to use. It also had the disadvantage of being relatively expensive.

[Problem to be solved by the invention] In view of the drawbacks of conventional equipment, this invention aims to improve the workability of reinforcing bar connections and provide an inexpensive equipment to the industry. It is.

[Means for solving the problem] As a means for solving the problem, this invention includes a reinforcing bar 40 having vertical and horizontal protrusions 41 and 42 on the end surface, and a joint 43 having a threaded portion 44 protruding from one end.
and an opening 13 into which the reinforcing steel is inserted from the axial direction.
and an opening 12 into which a sleeve 50, in which a joint 43 is previously housed, is inserted into one opening end from the outer circumferential direction, and the reinforcing bar insertion opening 13 has a central aperture having a diameter larger than the diameter of the reinforcing bar and smaller than the outer diameter of the sleeve. It consists of a housing 11 equipped with a sleeve punching die 16 with an opening 14, and a cylinder 10 that is integrally provided with the housing on the opposite side of the reinforcing bar insertion opening 13 with its axis aligned with the housing. is equipped with a piston 22 that moves forward and backward with a piston rod 23 under the action of pressure oil in a hydraulic circuit, and a partition wall 17 between the housing 11 and the cylinder 10 has a seal that prevents pressure oil from leaking from the outer periphery of the piston rod 23. A ring 18 is provided at the tip of the piston rod 23, and a fitting 43, an end face pressing portion 26 of the sleeve 50, and an insertion recess 2 of the threaded portion 44 of the fitting are provided.
5, and furthermore, a manual switching valve 37 for switching the hydraulic circuit for operating the piston 22 is provided on the outer periphery of the cylinder 10 to achieve the intended purpose.

[Operation] Insert the joint containing the main body into one open end of the sleeve through the opening of the housing, fit the threaded part of the joint into the insertion recess of the end pressing part, and then insert the end of the reinforcing bar into the housing. into the sleeve from the die side.

After completing the preparation in this way, when pressure oil is fed to the rear of the cylinder, the piston moves forward together with the end face pressing part, so the sleeve is pushed out together with the reinforcing bars and joints, and the outer peripheral surface of the sleeve is pressed against the die. It is then pushed through and narrowed in the centripetal direction. As a result, the sleeve is fixed to the outer peripheral surface of the reinforcing bar, and the reinforcing bar and the joint are connected via the sleeve.

After connection, when the manual switching valve is operated, the pressure oil supply circuit is switched and pressure oil is sent to the front of the cylinder, so the piston rod retreats to its original position and prepares for the next operation.

As described above, if the manual switching valve is operated again after preparations such as reinforcing bar insertion are completed, the punching operation is started again, and the reinforcing bar and the joint can be repeatedly joined.

[Example] An embodiment of the present invention will be described with reference to the drawings.

10 is a cylinder, and on the open end side of this cylinder 10, a cylindrical housing 11 having a slightly larger diameter than the cylinder is installed in series with the axes aligned with each other. Opening 1 for inserting the sleeve 50 that accommodates the joint 43 in advance
2 and 12 are formed at symmetrical positions. Furthermore, a die 16 for punching out the sleeve 50 is fixed within the tip opening 13 of the housing 11. Reference numeral 14 denotes a central aperture of the die 16, and 15 a tapered surface formed on the rear side of the aperture 14, that is, on the cylinder side. Further, a piston 22 having a seal ring 21 attached to its outer peripheral surface is accommodated in the cylinder 10, and a piston rod 23 connecting the piston 22 to the rear part is inserted into the housing from the center hole 18 of the partition wall 17 between the cylinder 10 and the housing 11. An end face pressing part 2 which protrudes into the piston rod 23 and has an insertion recess 25 formed in its front face for loosely fitting the threaded part 44 of the joint 43 at the tip of the piston rod 23.
Install 6. 28 is the center hole 18 of the partition wall 17
A seal ring attached to the inner peripheral surface of cylinder 1.
This is to prevent oil leakage from inside the 0.

A first fluid hole 31 and a second fluid hole 32 are formed at both ends of the cylinder 10 and communicate with the outside separately,
Both the through holes 31 and 32 are connected to a valve housing 33 installed on the outer peripheral surface of the cylinder 10 through pipes 38 and 39, and the valve housing 33 and a hydraulic pump (not shown) are connected through hoses 34 and 35. A rotary switching handle 36 for operating a manual switching valve 37 housed within the valve housing 33 is attached to the upper part of the valve housing 33 .

40 is a deformed reinforcing bar having irregularities on the surface, and has protrusions 41, 41 in the circumferential direction at regular intervals in the axial direction, and also has protrusions 42, 42 perpendicular to each other in the longitudinal direction, The protrusions 41 and 42 are formed in a lattice shape.

Reference numeral 43 denotes a joint, which has a threaded portion 44 at one end that engages with the screw hole of the turnbuckle 60, and a main body portion 4 formed to have approximately the same diameter as the deformed reinforcing bar 40 via a shoulder portion 45.
6 is formed with endless spiral protrusions or several protrusions 46a and grooves 46b alternately in the circumferential direction, and has the same function as the lattice-like protrusions 41 and 42 of the deformed reinforcing bar 40. 50 is a cylindrical sleeve whose outer diameter is slightly larger than the center aperture 14 of the die 16;
Furthermore, the inner diameter of the lattice-like protrusions 4 of the deformed reinforcing bars 40 is also
1 and 42 and the outer diameter of the protrusion 46a of the joint 43. Reference numeral 51 denotes a constriction portion for bringing one end surface of the sleeve 50 into surface contact with the end surface pressing portion 26 of the piston rod 23.

Next, the operation of the embodiment will be explained.

Joint 4 from the opposite side of constricted portion 51 of sleeve 50
3 to lock the inside of the constricted part 51 with the shoulder part 45. In this case, the joint 43 and the sleeve 50 are not yet fixed and can be freely separated. Next, the sleeve 50 and the joint 43 in this state are housed in the housing 11 through the opening 12. At that time, the threaded part 44 of the joint 43 is positioned on the cylinder side, the threaded part 44 is loosely fitted into the insertion recess 25 of the end face pressing part 26, and the sleeve 50 is moved toward the die 16 side of the housing 11. position.
A deformed reinforcing bar 40 is inserted into the center aperture 14 of the die 16 provided on the side of the tip opening 13 of the housing 11, and the tip of the deformed reinforcing bar 40 is inserted into the sleeve 50.
Insert it until it contacts the joint 43. In this case, the end face pressing portion 26 of the piston rod is connected to the joint 43.
The sleeve 50 is in contact with the shoulder portion 45 of the sleeve 50 and the end face of the constricted portion of the sleeve 50.

After completing the preparation as described above, the switching handle 36 is then rotated. When the hydraulic circuit is formed as shown in FIG. 3, pressure oil from a hydraulic pump (not shown) passes through the hose 34, the communication passage 37a of the switching valve 37, the pipe 38, and the first communication hole 31, and then flows to the rear of the cylinder 10. The pressure oil is pressurized into the chamber A and presses the rear side of the piston 22 to move the piston rod 29 forward. On the other hand, the oil in the front chamber B of the cylinder 10 flows through the second passage hole 32, the pipe 39, and the switching valve. It returns to the hydraulic pump via the communication path 37b of 37 and the hose 35. The center aperture 14 of the die 16 is a deformed reinforcing bar 40
is larger than the outer diameter of the sleeve 50, but smaller than the outer diameter of the sleeve 50, so when the piston rod 23 moves forward by hydraulic pressure, the deformed reinforcing bar 40, the joint 43, and the sleeve 50 are all pushed out toward the center throttle opening 14 of the die 16, The sleeve 50 is the center aperture 14
narrowed down by Therefore, on the one hand, the portion where the protrusions 41 and 42 of the deformed reinforcing bars and the protrusion 46a provided on the main body 46 of the joint 43 are located is reduced to the same outer diameter as the inner diameter of the center drawing port 14 of the die, and on the other hand, , the other parts are reduced in both inner and outer diameter by the distance between the inner circumferential surface of the sleeve 50 and the deformed reinforcing bar 40 and the groove 46b of the main body of the joint 43.
The sleeve 50, deformed reinforcing bar 40, and joint 43 are firmly crimped and fixed. When the deformed reinforcing bar 40, sleeve 50, and joint 43 are extruded as one from the die 16 at the opening at the tip of the housing 11, the work of fixing the deformed reinforcing bar 40 and the joint 43 is completed.

Next, operate the switching handle 36 to rotate the switching valve 37 as shown in FIG.
a to the pipe 38 side, and the communication path 37b to the pipe 3 side.
8 side, the pressure oil discharged from the hydraulic pump passes through the hose 34 to the front chamber B of the cylinder 10.
From the rear chamber A, oil returns to the hydraulic pump via a hose 35. At this time, the piston 23 returns to its original position, but no pressure higher than the set pressure is applied to the hose 34 that supplies pressure oil from the hydraulic pump.
Moreover, in this way, pressure oil flows through the hose 34, but high-pressure oil does not flow through the hose 35.

[Effects] The present invention provides a manual switching valve for switching the hydraulic circuit on the outside of the cylinder that houses the piston that advances the end face pressing part, and allows the sleeve to be accommodated from the side in the housing connected to the cylinder. The sleeve is squeezed with a die for punching out the sleeve provided at the opening at the tip of the sleeve, and the reinforcing bar and the joint are firmly connected through the sleeve, so the worker can visually check the status of the reinforcing bar, sleeve, and joint. Since the punching operation can be performed by operating the switching valve while checking, the joining operation of reinforcing bars, sleeves, and joints can be performed accurately. In addition, the switching valve is manually operated, and the circuit configuration of the switching valve, cylinder, and hydraulic pump allows oil to flow in one direction through the supply hose, causing the hydraulic pressure to exceed the set pressure. It has the advantage that the hose can be easily managed because it does not become damaged, and there is also the effect that there is no need to use unnecessary expensive hoses. In addition, this invention allows one worker to switch the hydraulic circuit by operating the switching valve while checking the stuck work area, which has the effect of further increasing the efficiency of punching work. be. In addition, the so-called operating part that performs the punching operation is formed in a three-part system with the cylinder and manual switching valve, which are the operating parts, so the structure is simple, convenient to carry, and easy to adjust. There is also.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is an overall perspective view, Figure 2 is a sectional view of the main part just before the start of punching work, Figures 3 and 4 are sectional views showing the operating state of the manual switching valve, and Figure 5 is a sleeve that connects deformed reinforcing bars and joints. FIG. 6 is a front view of main parts showing a state in which two deformed reinforcing bars are connected by a turnbuckle, and FIG. 7 is a perspective view showing an outline of a conventional device. 10...Cylinder, 11...Housing, 14
... Center throttle opening, 16 ... Sleeve punching die, 22 ... Piston, 23 ... Piston rod, 26 ... End face pressing part, 31 ... First through hole, 3
2...Second through hole, 34...Hose, 35...Hose, 36...Manual operation handle, 37...Manual switching valve, 38, 39...Pipe, 43...Joint, 5
0...Sleeve, 60...Turnbuckle.

Claims (1)

[Scope of utility model registration request] This is a device for fixing together a reinforcing bar 40 having longitudinal and lateral protrusions 41 and 42 on the end surface thereof and a joint 43 having a threaded part 44 protruding from one end thereof via a sleeve 50. opening 13 to be inserted from
and an opening 12 into which a sleeve 50, in which a joint 43 is previously housed, is inserted into one opening end from the outer circumferential direction, and the reinforcing bar insertion opening 13 has a central aperture having a diameter larger than the diameter of the reinforcing bar and smaller than the outer diameter of the sleeve. It consists of a housing 11 equipped with a sleeve punching die 16 with an opening 14, and a cylinder 10 integrally provided on the opposite side of the reinforcing bar insertion opening 13 with the axis aligned with the housing. is equipped with a piston 22 that moves forward and backward with a piston rod 23 under the action of pressure oil in a hydraulic circuit, and a partition wall 17 between the housing 11 and the cylinder 10 has a seal that prevents pressure oil from leaking from the outer periphery of the piston rod 23. A ring 18 is provided at the tip of the piston rod 23, and a fitting 43, an end face pressing portion 26 of the sleeve 50, and an insertion recess 2 of the threaded portion 44 of the fitting are provided.
5, and furthermore, a manual switching valve 37 for switching the hydraulic circuit for operating the piston 22 is provided on the outer periphery of the cylinder 10.