JP2014083468A - Device for rotating steel rod and coating film formation method and coating film formed-steel rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost of coating film formation of a steel rod by achieving mass production of the coating film formation and improving the reliability of coating film thickness.SOLUTION: A coating film formation method uses a device for rotating a steel rod which includes holding parts 3, 4 for holding both ends of steel rods R, and a rotational drive mechanism 5 for transmitting a rotational driving force to one of the holding parts 3, 4, and in which a plurality of sets of holding parts 3, 4 are arranged side by side substantially in the horizontal direction. In the method, a plurality of steel rods R are arranged parallel and paint for forming a coating film c is sprayed to the peripheries of the steel rods R while rotating the steel rods R simultaneously, and is dried to form the coating film c. In another embodiment, the coating film formation method uses a device for rotating a steel rod in which the holding parts 3, 4 are disposed in two stages alternately in the vertical direction. In the method, while simultaneously rotating the steel rods R disposed alternately in the vertical direction in upper and lower stages, the paint is sprayed to the peripheries of the steel rods without waste and is dried to form the coating film c.

Description

  The present invention relates to a steel rod rotating device, a steel rod film forming method, and a film-forming steel rod obtained by the method.

Steel bars are used as connection joints for box culverts (see Patent Documents 1 and 2, etc.).
For such jointed steel bars of box culverts, the ordering work of the Ministry of Transport of Japan has specifications of asphalt-based coatings with a thickness of 1 mm for rust prevention and waterproofing.
The asphalt-based film is formed by brushing a steel rod with a brush, and repeatedly coating the asphalt one by one until it reaches a predetermined thickness while being dried.

JP 9-324461 A JP 11-61955 A

However, it takes time to satisfy the predetermined thickness because the overcoating is performed while waiting for drying to prevent the liquid from dripping.
In addition, since the coating thickness is not uniform because of the hand coating, the material is often lost due to excessive coating.
And because the coating thickness lacks reliability, the frequency of quality control must be increased.
From the above, there are many losses in asphalt material costs and labor costs, and manufacturing costs are high.

An object of the present invention is to mass-produce the coating of a steel rod, improve the reliability of the film thickness, and reduce the cost.
Furthermore, this invention makes it the subject to suppress a loss of film material and to aim at cost reduction more.

In order to solve the above problems, the invention described in claim 1
A holding part for holding both ends of the steel bar;
A rotation driving mechanism for transmitting a rotation driving force to at least one of the holding parts, and a rotation driving device for a steel rod comprising:
A plurality of sets of the holding portions are arranged in a substantially horizontal direction.

The invention described in claim 2
The steel rod rotating device according to claim 1,
A plurality of sets of holding portions are alternately arranged in two stages in the vertical direction in the substantially horizontal direction.

The invention according to claim 3
A rotating device for a steel rod according to claim 1 or 2,
At least one of the holding parts is a nut into which a male thread part at an end of the steel bar is screwed, and a small-diameter nut is integrally provided in the back of the large-diameter nut.

The invention according to claim 4
It is characterized by a method for forming a coating on a steel rod, in which a coating for forming a coating is sprayed or applied around the steel rod while rotating.

The invention described in claim 5
A method for forming a film of a steel rod according to claim 4,
Using the steel rod rotating device according to any one of claims 1 to 3,
A plurality of the steel rods are arranged side by side and simultaneously rotated while spraying or applying the paint around the steel rods.

The invention described in claim 6
It is characterized by a method for forming a coating on a steel rod, in which the steel rod is rotated and immersed in a paint for forming a coating around the steel rod.

The invention described in claim 7
A method of forming a steel rod film according to claim 6,
Using the steel rod rotating device according to claim 1,
A plurality of the steel rods are arranged side by side and simultaneously rotated while being dipped in the paint and pulled up.

The invention according to claim 8 provides:
A method for forming a coating of a steel rod according to claim 7,
The paint tank containing the paint and the rotating device of the steel rod are relatively moved in the vertical direction.

The invention according to claim 9 is:
A film-forming steel bar formed by forming a film on the outer periphery of a steel bar by the method for forming a film of a steel bar according to any one of claims 4 to 8.

The invention according to claim 10 is:
The film-forming steel bar according to claim 9,
An asphalt film is formed as the film.

The invention according to claim 11
The film-forming steel bar according to claim 9 or 10,
It is used as a joint for connecting box culverts.

According to the present invention, the film formation of the steel rod can be mass-produced, the reliability of the film thickness can be improved, and the cost can be reduced.
Furthermore, the cost of the coating material can be reduced and the cost can be further reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a configuration of an embodiment of a steel rod rotating device to which the present invention is applied, and showing a film formation time. It is the perspective view which showed the steel rod before a film formation, and the film formation steel rod by this invention side by side. It is a top view of the rotating apparatus of the steel rod of FIG. It is a front view of the rotating apparatus of the steel rod of FIG. It is a side view of the rotating apparatus of the steel rod of FIG. It is a top view of the rotating apparatus of the steel rod of Embodiment 2, a paint tank, etc. FIG. 7 is a front view of the steel rod rotating device and the paint tank of FIG. 6. FIG. 8 is a side view of the steel rod rotating device and the paint tank of FIG. 7.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a configuration of an embodiment of a steel rod rotating device to which the present invention is applied. R is a round steel rod, 1 is a rotating device for a steel rod R, 2 is a work table, and 3 is a steel rod R. A holding part for holding one end part, 4 is a holding part for holding the other end part of the steel rod R, and 5 is a rotation drive mechanism.

  As shown in the figure, the rotating device 1 for the steel rod R has a plurality of (10 in the illustrated example) holding portions 3 each holding one end of the steel rod R along one side thereof on the work table 2. A plurality of holding portions 4 that hold the other end portion of the steel rod R along the other side are provided facing the holding portion 3 on one side while being arranged side by side at equal intervals in the horizontal direction. And the rotational drive mechanism 5 which each transmits rotational drive force to each holding | maintenance part 3 of one side is provided.

FIG. 2 shows a steel rod R. As shown in the upper part of FIG. 2, the steel rod R used as a joint for connecting a box culvert (not shown) has male screw portions n at both ends.
As shown in the lower part of FIG. 2, the steel rod R has a thickness of about 1 mm with an anti-rust / waterproof asphalt paint as shown in the lower part of FIG. 2 except for the male threaded portion n at both ends. It becomes a film-forming steel rod on which the film c is formed.

  3 to 5 are three-sided views showing the details of the rotating device 1 for the steel rod R. The holding portion 3 on one side has a male screw portion at the tip of the sheath tube 31 through which the male screw portion n at the end of the steel rod R passes. n is configured by fixing a large-diameter nut 32 and a small-diameter nut 33 that are screwed in accordance with the difference in the diameter of the steel rod R, in that order, by welding or the like.

  The other holding part 4 is constituted by a sheath tube 41.

  It should be noted that a plurality of sheath tubes 31, 41 on both sides are arranged on the upper surface of the rack 21 fixed to the upper portion of the work table 2 along both side portions, and in the illustrated example, they are arranged at equal intervals in the horizontal direction so as to be freely rotatable. 10 in the illustrated example).

The rotary drive mechanism 5 includes a sprocket 52 provided on a drive shaft of a motor 51 fixed on one side of the upper part of the work table 2 and a small-diameter nut 33 of the holding unit 3 on one side. Are fixed on the same axis by welding or the like, a plurality of (in the illustrated example) 10 sprockets 53, a sprocket 54 that faces the sprocket 52 of the motor 51 across the plurality of sprockets 53, and these sprockets 52, 53. And a chain 55 wound around 54.
Further, a plurality (two in the illustrated example) of sprockets 56 and one roller 57 for preventing the chain 55 from being lifted are provided.

As shown in FIGS. 4 and 5, the holding units 3 and 4 and the rotation drive mechanism 5 are arranged in two stages on the work table 2 and below the work table 2.
The upper and lower two-stage rotation drive mechanisms 5 and 5 are alternately arranged so that the sprockets 53 are positioned between the sprockets 53 as shown in FIG. Thereby, it becomes the structure by which the holding | maintenance part 3 * 4 of 2 steps | paragraphs of upper and lower sides was arrange | positioned alternately.

Next, a method for forming a coating on the steel rod R using the rotating device 1 for the steel rod R will be described.
Here, the asphalt-based paint used, for example, an emulsion type one-part rubber asphalt-based paint mainly composed of rubber and asphalt, is heated in advance to a predetermined temperature by a paint tank and a heater (not shown).

First, in the embodiment, 20 steel rods R are set in the rotating device 1.
That is, on the upper surface of each rack 21 above and below the work table 2, one of the male threaded portions n of the steel rod R is passed through the sheath tube 41, and the other of the male threaded portions n is passed through the sheath tube 31 to form the large-diameter nut 32 or Screw into one of the small diameter nuts 33.
In this way, a total of 20 steel rods R are set in parallel to the rotating device 1 at the top and bottom.

Next, by driving the motor 51, the sprocket 53 is rotated through the sprocket 52 and the chain 55, and the one side holding portion 3 is simultaneously rotated.
As a result, a total of 20 steel rods R, in which the male threaded portion n is screwed into either the large-diameter nut 32 or the small-diameter nut 33 of the holding portion 3 and arranged in parallel at the top and bottom, are rotated simultaneously.

Next, asphalt-based paint heated to a predetermined temperature in advance on the upper and lower 20 steel rods R rotating in parallel arrangement was sprayed by an operator with a spray gun 6 and dried as shown in FIG. Then, spray again to dry.
This process is repeated until a predetermined coating thickness (in the embodiment, about 1 mm) is reached.

  In this paint spraying process, the male threaded portions n at both ends of the steel rod R are covered and protected and protected by the sheath tube 31, the large diameter nut 32, the small diameter nut 33, and the sheath tube 41, respectively.

  Since the upper and lower steel rods R are alternately arranged so that the lower steel rods R are positioned between the upper steel rods R, the lower steel plates R are formed from the gaps between the upper steel rods R. Asphalt paint can be sprayed on the rod R, and the asphalt paint can be sprayed without waste.

The effects obtained by the above film forming method are as follows.
1) Application time can be shortened by spraying.
2) The coating thickness of the coating c can be made uniform by rotating the steel rod R.
3) The dripping can be suppressed by the rotation of the steel rod R, and the material loss can be reduced.
4) A plurality (20 in the embodiment) of the film-formed steel rods R can be manufactured at the same time.
5) Since the upper and lower steel rods R are alternately arranged, the paint can be sprayed without waste.

  As mentioned above, according to the film formation method of the steel rod R performed using the rotating apparatus 1 of the embodiment, the asphalt-based paint is sprayed and dried around the 20 steel rods R while being arranged in parallel and rotating simultaneously. Since the coating c for rust prevention and waterproofing is formed, the formation of the coating c on the periphery excluding the male threaded portion n at both ends of the steel rod R is mass-produced, and the reliability of the thickness of the coating c is improved. Cost can be reduced.

  Further, ten steel rods R in the upper and lower stages are alternately arranged, and asphalt paint is sprayed onto the lower steel rod R through the gap between the upper steel bars R, and the asphalt paint is sprayed without waste. Therefore, the loss of the asphalt-based paint forming the coating c can be suppressed, and the cost can be further reduced.

(Modification 1)
In the first embodiment described above, the holding units are alternately arranged in two stages in the vertical direction, but the holding units may be simply arranged in two upper and lower stages, and the holding units may be arranged in only one stage. .
In the first embodiment, the paint is sprayed. However, the present invention is not limited to this, and the paint may be applied by a brush.
Furthermore, the number of steel bars, the holding part, the configuration of the rotation drive mechanism, the type of coating (paint), etc. are arbitrary, and other specific details such as the structure can be changed as appropriate.

(Embodiment 2)
6 to 8 are three views showing the configuration of the rotating device 101 of the steel rod R and the paint tank 107 of the second embodiment, where 102 is a work table, 103 is a holding portion for holding both ends of the steel rod R, 104 Is a side guide, 105 is a rotation drive mechanism, and 106 is a roller.

  As shown in the figure, the rotating device 101 of the steel rod R holds both ends of the steel rod R along one side on the holding portion 103 and the work table 102 for holding both ends of the steel rod R, respectively. A plurality (ten in the illustrated example) of holding parts 3 are arranged in the horizontal direction at equal intervals and face each other. And the rotational drive mechanism 105 which each transmits rotational drive force to each holding | maintenance part 3 of both sides is provided.

The holding portions 103 are respectively provided along the inner sides of ten holding grooves 141 formed in the parallel side guides 104 fixed along the both sides of the work table 102, respectively. The roller 106 is driven to rotate.
That is, the holding groove 141 is formed in a substantially V shape that can hold the male threaded portion n at both ends of the steel rod R according to the difference in diameter. Further, the male screw portions n at both ends of the steel rod R are respectively held between two adjacent rollers 106 and rotate.

The rotation drive mechanism 105 is configured as follows.
That is, the toothed belt 155 is wound around the sprocket 152 provided on the drive shaft of the motor 151 fixed on one side of the upper portion of the work table 102 and the sprocket 153 supported by the work table 102 above the sprocket 152.

The sprocket 153 is provided on the long shaft 154, and the long shaft 154 is respectively supported on both sides of the work table 102, and sprockets 156 located on both sides of the work table 102 are provided at both ends thereof. It has been.
Further, on both sides of the work table 102, the sprocket 156, a plurality (ten in the illustrated example) of sprockets 157 that are arranged at equal intervals in the horizontal direction at the top of the work table 102, and the plurality of sprockets 157. A chain 159 is wound around a sprocket 158 opposed to the sprocket 156 with the gap therebetween.

A plurality of sprockets 157 are provided with rollers 106 fixed on the same axis.
In the steel rod R, male thread portions n are respectively held between two adjacent rollers 106 that rotate integrally with the sprocket 157 in the substantially V-shaped holding grooves 141 of the side guides 104 on both sides of the work table 102. Has been rotated.

The paint tank 107 is incorporated in the upper inside of the work table 102 and has grooves for inserting the steel rods R on both sides.
The paint tank 107 is supported by the jacks 108 arranged at the front, rear, left and right inside the work table 102 so as to be movable up and down at the four corners. The jack 108 is manually operated in the embodiment, but may be automatically operated hydraulically or electrically.

  Further, a plurality of heaters 109 (two on the left and right in the illustrated example) positioned below the paint tank 107 are disposed inside the work table 102. The heater 109 heats the asphalt-based paint placed in the paint tank 107 to a predetermined temperature. In the embodiment, the heater 109 is a gas heater but may be an electric heater.

Next, a method for forming a coating on the steel rod R, which is performed using the rotating device 101 for the steel rod R described above, will be described.
Here, the asphalt-based paint in the paint tank 107 is heated to a predetermined temperature by the heater 109 in advance.

First, in the embodiment, ten steel rods R are set on the rotating device 101 in a state where the jack 108 is operated and the paint tank 107 is lowered.
That is, the male thread portions n at both ends of the steel rod R are inserted into the holding grooves 141 of the side guides 104 on both sides on the work table 102 and are held between the two adjacent rollers 106.
In this way, ten steel rods R are set in parallel to the rotating device 101.

Next, by driving the motor 151, the sprockets 157 are rotated through the sprockets 152, 153, the toothed belt 155, the sprocket 156, and the chain 159, and the holding portions 3 on both sides are simultaneously rotated.
That is, all the rollers 106 are rotated, and on both sides, the ten steel rods R arranged in parallel and held by the male screw portions n at both ends between the two adjacent rollers 106 are simultaneously rotated.

Next, with respect to the ten steel rods R rotating in parallel, the jack 108 is operated to raise the paint tank 107, and the male threaded portions n at both ends of the steel bar R are inserted into the grooves on both sides of the paint tank 107. The substantially lower half of the removed portion is dipped in an asphalt paint heated to a predetermined temperature in the paint tank 107 and then dried, and then dipped again and dried.
This process is repeated until a predetermined coating thickness (in the embodiment, about 1 mm) is reached.

  In this paint dipping process, the male threaded portions n at both ends of the steel rod R are projected and protected on both sides of the paint tank 107.

The effects obtained by the above film forming method are as follows.
1) Application time can be shortened by immersion.
2) The coating thickness of the coating c can be made uniform by rotating the steel rod R.
3) The dripping can be suppressed by the rotation of the steel rod R, and the material loss can be reduced.
4) A plurality (10 in the embodiment) of the film-formed steel rods R can be manufactured at the same time.
5) Since it was immersed in the paint, the paint can be used without waste.

  As described above, the coating method for the steel rod R performed using the rotating device 101 and the paint tank 107 according to the second embodiment also applies to the surroundings except for the male screw portions n at both ends of the steel rod R, as in the first embodiment. The formation of the coating c can be mass-produced to improve the reliability of the thickness of the coating c and reduce the cost.

(Modification 2)
In the above embodiment 2, although the paint tank was moved up and down, the rotating device of the steel rod may be moved up and down.
Further, instead of the vertical movement of the paint tank or the steel rod rotating device, the paint may be drained from the paint tank after immersion. This is simpler in structure and more advantageous in cost.
Furthermore, the number of steel bars, the holding part, the configuration of the rotation drive mechanism, the configuration of the paint tank, etc. are arbitrary, and it is needless to say that other specific detailed structures can be changed as appropriate.

R Steel bar n Male thread part c Coating 1 Steel bar rotating device 2 Work table 21 Rack 3 Holding part 31 Sheath pipe 32 Large diameter nut 33 Small diameter nut 4 Holding part 41 Sheath pipe 5 Rotation drive mechanism 51 Motor 52 Sprocket 53 Sprocket 54 Sprocket 55 Chain 56 Sprocket 57 Roller 6 Spray gun 101 Steel rod rotating device 102 Work table 103 Holding part 104 Side guide 141 Holding groove 105 Rotation drive mechanism 151 Motor 152 Sprocket 153 Sprocket 154 Long shaft 155 Chain 156 Sprocket 157 Sprocket 158 Sprocket 159 Chain 106 Roller 107 Paint tank 108 Jack 109 Heater

Claims (11)

A holding part for holding both ends of the steel bar;
A rotation driving mechanism for transmitting a rotation driving force to at least one of the holding parts, and a rotation driving device for a steel rod comprising:
A rotating device for a steel rod, wherein a plurality of sets of the holding portions are arranged in a substantially horizontal direction.   The steel rod rotating device according to claim 1, wherein a plurality of sets of holding portions are arranged alternately in two stages in the vertical direction in the substantially horizontal direction.   3. The steel according to claim 1, wherein at least one of the holding portions is a nut into which a male screw portion at an end of the steel rod is screwed, and a small-diameter nut is integrally provided in the back of the large-diameter nut. Rod rotating device.   A method for forming a coating on a steel rod, the method comprising spraying or applying a coating for forming a coating around the steel rod while rotating the steel rod. Using the steel rod rotating device according to any one of claims 1 to 3,
5. The method of forming a coating on a steel rod according to claim 4, wherein the coating material is sprayed or applied to the periphery of the steel rod while a plurality of the steel rods are arranged and rotated simultaneously.   A method for forming a coating on a steel rod, characterized in that the steel rod is rotated and immersed in a paint for forming a coating around the steel rod. Using the steel rod rotating device according to claim 1,
The method for forming a coating of a steel rod according to claim 6, wherein the steel rod is dipped in the paint and pulled up while rotating a plurality of the steel rods simultaneously.   8. The method of forming a coating film for a steel rod according to claim 7, wherein the coating tank containing the coating material and the rotating device for the steel rod are relatively moved in the vertical direction.   A film-forming steel bar, wherein a film is formed on the outer periphery of a steel bar by the method for forming a film of a steel bar according to any one of claims 4 to 8.   The film-forming steel rod according to claim 9, wherein an asphalt-based film is formed as the film.   The film-formed steel bar according to claim 9 or 10, which is used as a joint for connecting box culverts.

Images