JPH10517A - Automatic nut fastening apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To follow the movement of an abutting object so as to quickly fasten a nut without touching a hand thereon or monitoring it by holding abutting states between the abutting object, which moves continuously by being imparted with rotation force by a rotation imparting means, and a nut. SOLUTION: A nut fastening apparatus is brought in contact with a receiver member 41 fixedly provided on the bottom face of a support member 29 composed of a pair of channel steels and at the same time provided with a nut 42 thread engaged with a PC screw conveyor 16 and a driven pulley 43 integrally constituted of the nut 42. A driven pulley 46 integrally constituted of the support member 29 via an arm steel 44 and a pedestal 45, a toothed transmission belt 47 stretched between the driven pulley 43 and the drive pulley 46, and a torque motor 48. The rotation force is thus imparted to the nut 42 continuously to hold the abutting state between a moving receiver member 41 and the nut so that the nut can be quickly fastened by following the movement of the receiver member 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped member having a thread which is widely used in a wide range of fields and a nut which is screwed to the rod-shaped member. The present invention relates to an automatic nut tightening device capable of automatically tightening a nut following a movement of an abutting object required to be tightened.

[0002]

2. Description of the Related Art In recent years, a rod-shaped member having a thread and a nut to be screwed thereto have been used for various uses other than the intended use over a wide range of fields.
For example, in the fields of civil engineering and construction, a PC screw cone having a screw thread and a nut screwed thereto are used in a slide-type form device used when constructing a concrete structure such as a bridge pier.

[0003] That is, as shown in FIG.
Forming device frame 102 surrounding a plurality of suspension piers 101 suspended horizontally at the top of a reaction column 103 vertically suspended at the center of the pier 101 prior to the construction of the pier 101. Formwork frame 1 to PC steel strand 105
02 integrated with lifting jack device 106
It can be suspended by gripping the
By operating the lifting jack device 106, an elevating (sliding) operation is performed.

[0004] In this case, the formwork device frame 10
2 is suspended only by a plurality of PC steel strands 105, so that even if the thoroughness is ensured, the PC steel strands 1
If the load of the formwork frame 102 is concentrated on the kinked portion of the part 05, the strand 105 of the PC steel may be cut, and if it is cut, it will only seriously damage the formwork frame 102. Or, it is difficult to ensure the safety of the worker.

For this reason, conventionally, a PC screw cone 107 having a screw thread capable of withstanding the load of the formwork frame 102 when the PC steel strand is cut is arranged beside the PC steel strand 105. By suspending from the reaction force base 104, a nut 108 is screwed into the PC screw cone 107, and the upper surface thereof is brought into contact with the formwork frame 102 to prepare for a case where the PC steel wire 105 is cut. Was.

However, when the formwork apparatus frame 102 is lifted during the setup change, the worker cannot be put on the temporary scaffold 109 from the viewpoint of ensuring the safety of the worker.
2, the upper surface of the nut 108 cannot be brought into contact with the formwork frame 102 and the PC stranded wire 1
Not only will there be situations in which it is practically impossible to prepare for the cutting of 05, but such situations will occur during the most dangerous time of the rise of the formwork frame 102.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention
It was made in view of the above-mentioned problems,
When it is necessary that the contact state between the contact object and the nut be maintained, the movement of the contact object can be performed without touching the worker or without monitoring the worker. It is an object of the present invention to obtain an automatic nut tightening device in which the nut is quickly tightened according to the following.

[0008]

That is, as shown in FIG. 1, an automatic nut tightening device according to the present invention is screwed into a rod-shaped member 1 having a thread and simultaneously an object T to be contacted.
, A driven pulley 3 formed integrally with the nut 2, a drive pulley 4 formed integrally with the contact target T, and a tension between the driven pulley 3 and the drive pulley 4. A transmission belt 5 to be bridged and a nut 2 via a drive pulley 4, a transmission belt 5
A rotating force applying means 6 for applying a rotating force to the nut 2, and the contact state between the moving contact object T and the nut 2 is maintained by continuously applying the rotating force by the rotating force applying means 6. It is characterized by being performed.

The rod-shaped member 1 not only maintains the contact state with the contact object T, but also maintains the contact state and also supports the load of the contact object T. For example, a PC screw controller is preferable.

[0010] Further, when the motor is used as the rotational force applying means 6, the rotational force applying means 6 is, from the viewpoint that seizure hardly occurs even when the rotation of the motor is restricted, Preferably, it is a torque motor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 is a schematic explanatory view showing an embodiment of the automatic nut tightening device according to the present invention applied to a slide type formwork in pier construction.

In the same figure, a formwork frame 12 arranged facing the side of the pier 11 is provided on the top of a reaction column (not shown) which is vertically suspended prior to the construction of the pier 11. A PC steel stranded wire 14 whose upper end is fixed by a fixing tool 14a is attached to a reaction force base 13 composed of a beam steel 13a fixed horizontally and a work platform 13b and a handrail 13c provided on the beam steel 13a. After being hung, it is hung on this PC steel strand 14 via a lifting jack device 15 integrated with the formwork frame 12.

Further, as a safety measure, the formwork device frame 12 in this embodiment has a PC screw connector having a thread which can withstand the load of the formwork device frame 12 in case the PC steel strand 14 is cut. 16 is arranged beside the PC steel strand 14, and the upper end thereof is fixed to the reaction force base 13 with the fixing tool 16 a and suspended, and the PC is suspended.
An automatic nut tightening device 17 is provided below the form device frame 12 of the screw controller 16 to support the form device frame 12 in contact.

In this embodiment, the formwork device frame 12 is composed of a steel material and a work scaffold which are integrally provided vertically and horizontally and have a function of fixing the formwork. Vertical member 21 and pier 11
A vertical member 22 disposed on the opposite side to the horizontal members 23, 24,
25, 26, the horizontal member 23 has a first-floor temporary scaffold 23a, and the horizontal member 24 has a second-floor temporary scaffold 24.
In the horizontal member 25, temporary floors 25a are provided on the third floor, on which an operator rides to perform setting work of the formwork and the like.

At the site of this embodiment, from the viewpoint of ensuring the safety of workers, when the formwork apparatus frame 12 is raised during the setup change, the temporary scaffold 23 is used.
It is not permitted to put workers on a, 23b and 23c.

A channel steel 27 is fixed to the lower surface of the horizontal member 26 in a positional relationship orthogonal to the horizontal member 26, while the height of the horizontal member 26 is attached to the upper end of the side of the vertical member 21 on the pier side. A channel member 28 is fixed in the vicinity of the frame member 27. The channel members 27 and 28 include a pair of channel members having a gap corresponding to the outer diameter of the PC stranded wire 14 and the PC screw control 16, and a support member 29 formed of the pair. Fixed.

Further, in this embodiment, the lifting jack device 15 comprises a prismatic upper jack body 15a fixed to the lower surface of the support member 29, and a prismatic lower jack which is connected to and contractible from the main body. Body 15b
And an upper center hole jack 15c provided in the upper jack body 15a and integrally provided therewith.
And a lower center hole jack 15d provided in the lower jack body 15b and provided integrally therewith.
The upper jack body 15a and the lower jack body 15b expand and contract vertically to perform a jacking operation.

Furthermore, the upper mold jack 3 is disposed above and below the vertical member 21 on the second floor of the formwork apparatus frame 12.
0 and the lower formwork jack 31 are fixed, and the formwork 3 having a height dimension corresponding to the construction amount is provided at the tip of the upper formwork jack 30 and the lower formwork jack 31 on the pier 11 side.
2 is fixed.

At the lower part of the vertical member 21 on the first floor of the formwork frame 12, a stopper hydraulic jack 33 for properly securing the space between the formwork frame 12 and the pier 11 is fixed. A hydraulic unit 34 that supplies hydraulic pressure to the stopper hydraulic jack 33 is mounted on the temporary floor scaffold 23a.

The formwork apparatus frame 12 constructed as described above supports the suspended PC steel strand 14 by the support member 2.
9 and the upper center hole jack 1 in the lifting jack device 15.
It is suspended by gripping either the upper center hole jack 15c or the lower center hole jack 15d through the center holes of 5c and the lower center hole jack 15d.

In this embodiment, as shown in the longitudinal sectional view of FIG. 3 and the plan view of FIG. 4, the automatic nut tightening device 17 includes a receiving member 41 fixed to the lower surface of a pair of grooved steel supporting members 29. PC screw control 1
6, a driven pulley 43 integrally formed with the nut 42, an arm steel 44 and a pedestal 4.
5, a drive pulley 46 integrally formed with the support member 29, a toothed transmission belt 47 stretched between the driven pulley 43 and the drive pulley 46, and a switch box fixed to the base 45. And a torque motor 48 having a motor 48a.

It should be noted that the torque motor 48 is made to survive the wind and rain by a metal cover 49 from the viewpoint of extending the life.

A bearing 5 which can be fastened with a bolt 50a to a shaft 45b fixed below a plate member 45a protruding from the side of the pedestal 45 on the PC screw control 16 side.
The belt tension adjusting device 50 having Ob is rotatable about a shaft 45b.

According to the belt tension adjusting device 50, by loosening the bolts 50a and rotating the belt tension adjusting device 50 itself to adjust the contact state with the toothed transmission belt 47, the toothed transmission belt can be easily formed. The tension of 47 can be adjusted.

Next, in this embodiment, the operation of the automatic nut tightening device 17 when raising the formwork frame 12 will be described with reference to FIGS. 3 and 4. FIG.

First, when the switch (not shown) of the switch box 48a is turned on in advance when the frame device frame 12 is raised, the torque motor 48 moves the drive pulley 46, the toothed transmission belt 47
And the rotational force of the driven pulley 43 is restricted through the driven pulley 43 because the nut 42 abuts on the receiving member 41 that has not yet moved and is tightened. The rotation of the torque motor 48 is restricted by the engagement force generated between the transmission belt 43 and the driving pulley 46 and the toothed transmission belt 47. In this case, since the torque motor 48 has a feature that the seizure hardly occurs even if the rotation is restricted, there is no problem unless the restricted time is long.

Next, when the ascending of the formwork apparatus frame 12 is started and the receiving member 41 is raised, the nut 42, which has been in contact with the receiving member 41 and is tightened, is loosened from the receiving member 41. However, when the gap between the nut 42 and the receiving member 41 is about to increase, the rotation of the restrained nut 42 becomes free soon,
The nut 42 performs a rotating motion by the torque motor 48.

At this time, the rotational movement of the nut 42 by the torque motor 48 is set to a rotational speed that is not inferior to the ascending speed of the formwork frame 12.
When the tightening of the nut 42 with respect to the receiving member 41 is loosened, the nut 42 will soon rotate and follow the rising of the receiving member 41, and as a result,
The contact state between the receiving member 41 and the nut 42 is maintained.

In this embodiment, since the lifting jack device 15 is used as a means for raising the formwork frame 12, the lower jack body 15b is connected to the upper jack body 15a when performing the lifting operation. The formwork apparatus frame 12 stops rising during the so-called contraction process of drawing, but in this case also, the characteristics of the torque motor 48 that is unlikely to cause seizure are sufficiently exhibited.

[0030]

As described above, according to the present invention, a nut that is screwed into a rod-shaped member having a thread and simultaneously comes into contact with an object to be contacted, a driven pulley integrated with the nut, A drive pulley integral with the contact object,
A transmission belt stretched between these pulleys, and a rotational force applying means for applying a rotational force to the nut via these pulleys and the transmission belt are provided. The contact state between the abutment object and the nut is maintained, so that the abutment object can follow the movement of the abutment object without touching the hand or even without monitoring. And the nut can be quickly tightened.

If a PC screw control is used as the rod-shaped member, not only the contact state with the contact object is maintained, but also the contact state is maintained, and the load of the contact object is maintained. Can also be supported.

Further, if a torque motor is used as the rotating force applying means, even if the rotation of the motor is restricted during operation of the motor, it is possible to effectively prevent the motor from burning if it is not restricted for a long time. Can be avoided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a basic configuration of an automatic nut tightening device of the present invention.

FIG. 2 is an explanatory view showing that an embodiment of the automatic nut tightening device of the present invention is applied to a slide type formwork in pier construction.

FIG. 3 is a longitudinal sectional view showing an automatic nut tightening device according to the embodiment of the present invention.

FIG. 4 is a plan view showing an automatic nut tightening device according to the embodiment of the present invention.

FIG. 5 is a schematic explanatory view showing a construction method using a slide type formwork in a conventional pier construction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bar-shaped member 2 ... Nut 3 ... Driven pulley 4 ... Driving pulley 5 ... Transmission belt 6 ... Rotating force applying means 11 ... Bridge pier 12 ... Formwork frame 13 ... Reaction force stand 14 ... PC steel strand 15 ... Lifting jack Apparatus 16 PC screw control 17 Nut automatic tightening device 21 Vertical member 22 Vertical member 23 Horizontal member 23a Temporary scaffold 24 Horizontal member 24a Temporary scaffold 25 Horizontal member 25a Temporary scaffold 26 Horizontal member 27 Groove Mold steel 28 ... Channel steel 29 ... Support member 30 ... Jack for upper mold 31 ... Jack for lower mold 32 ... Mold 33 ... Hydraulic jack for stopper 34 ... Hydraulic unit 41 ... Receiving member 42 ... Nut 43 ... Followed pulley 44 ... Arm steel 45 ... pedestal 45a ... plate member 45b ... shaft 46 ... drive pulley 47 ... toothed power transmission belt 4 ... Torque motor 48a ... Switch box 49 ... Cover 50 ... Belt tension adjusting device 50a ... Bolt 50b ... Bearing 101 ... Bridge pier 102 ... Formwork frame 103 ... Reaction column 104 ... Reaction frame 105 ... PC steel strand 106 ... Lifting Jack device 107: PC screw control 108: Nut 109: Temporary scaffold T: Contact object

Claims (3)

[Claims] 1. A nut (2) which is screwed into a rod-shaped member (1) having a thread and simultaneously comes into contact with an object (T) to be contacted.
, A driven pulley (3) formed integrally with the nut (2), a drive pulley (4) formed integrally with the contact target (T), and a driven pulley (3) and a drive pulley ( And a transmission belt (5) stretched between the transmission belt and the driving pulley (4), a transmission belt (5), and a driven pulley (3). Means (6), and the contact state between the moving contact object (T) and the nut (2) is maintained by continuously applying the rotational force by the rotational force applying means (6). Automatic tightening device for nuts. 2. The automatic nut tightening device according to claim 1, wherein the rod-shaped member is a PC screw cone. 3. The automatic nut tightening device according to claim 2, wherein said torque applying means is a torque motor.