JPS6257691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direct heat treatment apparatus for rolled wire rods, which enables well-controlled cooling of a helical coil formed from rolled wire rods to obtain a desired uniform heat treatment structure with less deformation. The purpose is to improve the cooling efficiency of the cooling air.

As a direct heat treatment apparatus for the rolled wire rod coming out of the final hot rolling mill, there are those shown in FIGS. It is considered as coil 2,
The spiral coil 2 falls onto the chain conveyor 3 and is conveyed by the chain conveyor 3.

A bottom plate 5 having a large number of air outlets 4 is installed below the chain conveyor 3, and the cooling air sent from the air blower 6 through the duct 7 is passed through the air outlet 4 to the spiral coil 2 being conveyed. sprayed on,
The helical coil 2 is regulated and cooled.

However, in the conventional device described above, since the spiral coil 2 is conveyed by the chain conveyor 3 with the loop portions 2a overlapping each other, the spiral coil 2
There was a problem in that it was difficult to uniformly cool the steel, making it difficult to obtain a uniform heat-treated structure.

In addition, in the conventional device described above, since the cooling air is blown from the air outlet 4 onto the spiral coil 2 from below, the contact time of the cooling air blown out from the air outlet 4 with the spiral coil 2 is There was also the problem that the cooling efficiency of the cooling air was poor due to the short length of time.

The present invention has solved the above problems, and its features include: a loop forming machine that forms a hot rolled wire into a spiral coil; A conveyor that conveys at a predetermined pitch; a conveyor that is driven in the same direction at a speed that is substantially synchronized with the conveyor, so that each loop portion of the helical coil discharged from the loop forming machine is separated from the adjacent loop portion by a predetermined distance. a holding conveyor that holds the spiral coil in a predetermined forward-inclined posture; a duct whose inner part is a path along which the loop portion is conveyed in the forward-inclined posture; and a water mist generator that sprays water mist onto the spiral coil in the duct to control the heat treatment temperature of the spiral coil.

Hereinafter, the first embodiment of the present invention will be explained with reference to FIGS. 4 to 10.
To explain in detail based on the drawings in the figure, 10 is a rolled wire rod hot-rolled in a finishing rolling mill, and 11 is the rolled wire rod 10.
This is a loop forming machine that forms a continuous spiral coil 12, and the spiral coil 12 is rotatably supported around an inclined axis so that the discharged spiral coil 12 falls forward. 13 is a water cooler, and 14 is a pinch roller.

Reference numeral 15 denotes a conveying device for the helical coil 12, which is provided on the coil discharge side of the loop forming machine 11 and consists of a conveyor 16 and a holding device 17 disposed above the conveyor.

The conveyor 16 sequentially conveys the spiral coil 12 discharged from the loop forming machine 11 and dropped onto the conveyor 16 at a predetermined pitch, and is constituted by a pair of left and right chain conveyors 18 with claws. Below the transport side of the transport conveyor 16, floor plates 19 in which no air outlet is formed are laid in a continuous manner. Reference numeral 20 denotes guides for the chain conveyor 18, which are fixed in pairs on the left and right sides on the bottom plate 19.

The holding device 17 holds each loop portion 12a of the helical coil 12 conveyed by the conveyor 16 in a predetermined forward tilted posture with a predetermined distance from the adjacent loop portion 12a.
The main structure includes a tilting frame 22, a holding conveyor 23, and the like.

The truck group 21 is movable in the longitudinal direction above the front part of the conveyor 16, and the air blower truck 24 and the wind truck 25 for the two vehicles can be attached and detached in the above order in the forward direction. It is constructed by arranging and connecting. A truck frame 26 is provided at the lower part of each truck 24, 25 so that its height can be freely adjusted via an elongated hole 27 in the vertical direction. The truck frame 26 has wheels 29 running on rails 28, and appropriate wheels 29 are driven by a motor 30 with a reduction gear via a chain transmission mechanism.

The tilting frame 22 is provided so as to protrude from the front end of the leading wind truck 25 toward the rear upper side of the conveyor 16, and includes a bracket 32 fixed to the front end.
It is supported via a bearing so as to be able to move up and down, and is rotated by a power cylinder 33.

The holding conveyor 23 holds the helical coil 12 discharged onto the conveyor 16 from the loop forming machine 11.
Each loop portion 12a is held in a predetermined forward tilted position at a predetermined distance from the adjacent loop portion 12a, and a pair of left and right chains 34 and a rotatable chain are provided between the chains 34 at predetermined intervals in the conveyance direction. It is composed of a large number of bars 35 provided in the width direction, a small gear (not shown), etc. provided at one end of each bar 35.

Each chain 34 is connected to the rearmost blower truck 2.
4. It is wound between a pair of left and right drive chain wheels 36 rotatably provided at the front end of the tilting frame 22 and a pair of left and right driven chain wheels 37 rotatably provided at the front end of the tilting frame 22, and the middle part thereof However, the trolley 24,2
5 and the tilting frame 22 by guide rails 38 and guide rolls 39, which are appropriately attached to the tilting frame 22.

The drive chain wheel 36 is provided on the last blower truck 24 via a chain tensioning device 40, and
4 is driven by a motor 41 via a reduction gear 42 and a chain transmission mechanism 43.

Reference numeral 44 denotes a fan-shaped support plate, which is fixed to the front end of the tilting frame 22, and on its outer periphery, a large number of pins 45 protruding inward are fixedly fixed at equal pitches.
The pin 45 engages with a small gear fixed to one end of each bar 35, so that the bar 35 is connected to the helical coil 1.
The bar 35 is rotated at the location where it receives each loop portion 12a of No. 2, and before and after the location.

Therefore, within each trolley 24, 25, the loop portion 1
2a is conveyed in a forward-inclined posture, and this conveyance path is internalized by a duct 46.
The duct 46 is connected to a bottom plate 19, upper and lower plates 49 and 50 for the left and right pair provided on the upper and lower frames 47 and 48 on each side, and a top plate 51 extending upward in a curved shape. It is configured in a cylindrical shape.

The upper and lower frames 47 and 48 are helical coils 12
An upper frame 47 is provided on each of the carts 24 and 25, and a lower frame 48
is provided on the fixed side. The lower end of the upper plate 49 provided below from the upper frame 47 faces or slidably contacts the upper end of the lower plate 50 provided on the lower frame 48 with a small gap, and
A midway portion in the height direction of the lower plate 50 is fixed to each side end portion of each bottom plate 19.

The top plate 51 is placed between the left and right upper frames 47.

Note that the return side of the holding conveyor 23 is disposed above the duct 46.

On both sides of each blower truck 24, a pair of left and right blowers 52 and blow pipes 53 are arranged in front and behind.
The blower 52 cools the helical coil 12 by sending cooling air from the rear to the front in the duct 46, that is, in the opposite direction to the conveying direction of the helical coil 12, and uses a Sirotskov fan or the like. Air blower tube 53
The blower 52 and the duct 46 are communicated with each other to guide cooling air into the duct 46 from the side thereof.

Although the top plate 51 has a flat plate shape at the position in the duct 46 that communicates with the blower tube 53, the top plate 51 may be formed integrally with the top plate of the blower tube 53 at the above-mentioned position.

54 is a fixed exhaust pipe, and the tilting frame 22
It opens downward at the upper side of the duct 46, and is connected to a blower (not shown) to suck in the cooling air discharged forward from the duct 46 and discharge it to the outside.

Reference numeral 55 denotes a water mist generator, which consists of a pump (not shown) and a conduit 56 installed at an appropriate location on the inner surface of the duct 46. Cooling water sent from the pump is sent to a spray section provided in the conduit 56. (Illustration omitted)
The water is sprayed onto the spiral coil 12 as a water mist, the spiral coil 12 is cooled, and its heat treatment temperature is controlled.

Next, the effect will be explained. When the rolled wire rod 10 that has been finish rolled in the finishing mill is supplied to the loop forming machine 11 via the water cooler 13 and the pinch rollers 14, the loop forming machine 11 rotates at a rotational speed commensurate with the wire rod speed, and the rolling The wire rod 10 is formed into a helical coil 12 having a predetermined diameter, and is sequentially discharged onto a conveyor 16 from the discharge side.

Each loop portion 12a of the discharged spiral coil 12 is gradually tilted onto the conveyor 16 as shown in FIG. 5 while being conveyed.
At this time, the bar 35 of the holding conveyor 23, which is being circulated above the conveyor 16, enters between the adjacent loop parts 12a and catches each loop part 12a in the middle of tilting. The parts 12a do not overlap,
Each loop portion 12a is securely held in a predetermined (approximately 45 degrees in the illustrated example) forward-inclined posture by the bar 35 while being separated by a predetermined distance, and in this state, the helical coil 12
are conveyed at a predetermined pitch by the conveyor 16.

Thus, the spiral coil 12 is connected to the conveyor 16.
It enters the duct 46 and is adjusted and cooled by cooling air and water mist.

In the above case, within the duct 46, each loop portion 12a is connected to the bar 35 with the adjacent loop portions 12a separated from each other by a predetermined distance without overlapping each other.
Since the helical coil 12 is held in a predetermined forward tilted posture, the helical coil 12 can be uniformly cooled by cooling air and water mist, and the heat treatment structure of the helical coil 12 can be made uniform.

In addition, cooling air is supplied to the duct 4 by each blower 52.
6 from the rear to the front, the spiral coil 12
The spiral coil 12 of the cooling air sent by each blower 52
The contact time is much longer than before, and the cooling efficiency is high.

Furthermore, since each loop portion 12a in the duct 46 is held in a predetermined forward tilted posture, each loop portion 12a
a tries to bend forward and diagonally downward, but as mentioned above, since the cooling air is sent in the opposite direction to the conveyance direction of the spiral coil 12, the cooling air is deflected by the wind pressure into each loop portion 12a. It is possible to suitably prevent deflection of the structure and obtain a heat-treated structure with little deformation.

In the above case, the cooling air is sent in a turbulent state into the duct 46 of the blower truck 24 from each blower 52 through the blower tube 53, and the cooling air is sent into the duct 46 of the blower truck 24.
A laminar flow state occurs in the duct 46 of No. 5, and the wind truck 2
In the duct 46 of the wind truck 25, each loop portion 12a receives approximately uniform wind pressure from the cooling air. helical coil 12
It is possible to extremely suitably prevent the bending of each loop portion 12a due to softening near the transformation point, and furthermore, it is possible to obtain a heat-treated structure with less deformation.

In addition, a conduit 56 is provided at a suitable location within the duct 46, and water mist is sprayed onto the helical coil 12 from the spraying section of the conduit 56.
Since the heat treatment temperature is controlled, the spiral coil 12 can be well controlled and cooled together with the cooling by the cooling air, and a desired uniform heat treatment structure with little deformation can be obtained.

Furthermore, the cooling time of the spiral coil 12 can also be changed by changing the number of vehicles in the wind road truck 25 and changing the length of the duct 46.

Alternatively, by moving the group of carts 21 back and forth to adjust the distance between the holding conveyor 23 and the loop forming machine 11, or by rotating the tilting frame 22 with the power cylinder 33, the holding conveyor 2
3 and the loop forming machine 11, the contact portion of the loop portion 12a with the bar 35 can be changed, the inclination angle α of the loop portion 12a during conveyance can be adjusted, and the helical coil 12 can be adjusted. The amount of cooling can be adjusted, and for example, local cooling of the helical coil 12 can be prevented.

Furthermore, by performing the above adjustment operation, the position where the loop part 12a is received by the bar 35 can be adjusted in the front-rear direction, that is, in the longitudinal direction of the conveyor 16, depending on the work conditions, and the bar 3
5, the loop portion 12a can be properly received at all times.

FIG. 11 and FIG. 12 show a second embodiment of the present invention, in which a single wind truck 25 is provided, and a wind exhaust truck 57 is provided in front of the wind truck 25.
On both the left and right sides of the wind exhaust truck 57, a suction tube 58, an exhaust fan 59, and a discharge tube 60, which are in communication with each other from the inside of the duct 46 and the side thereof, are arranged as a pair to communicate with each other. The cooling air passing through the duct 46 is movable and is discharged to the outside via a suction pipe 58, an exhaust fan 59, and a discharge pipe 60.

As detailed above, according to the present invention, in a duct through which cooling air passes and water mist is sprayed, each loop portion of a helical coil is arranged in front of a predetermined distance at a predetermined distance from an adjacent loop portion. Since the helical coil is held in an inclined position by the holding conveyor, the helical coil can be cooled uniformly, and the heat treatment structure of the helical coil can be made uniform.

In addition, since the blower sends the cooling air in the opposite direction to the direction in which the spiral coil is conveyed, the contact time of the cooling air sent by each blower with the spiral coil is longer than before, resulting in high cooling efficiency and The wind pressure of the cooling air can suitably prevent each loop portion from being bent forward and downward, and a heat-treated structure with little deformation can be obtained.

Furthermore, the water mist generator sprays water mist onto the spiral coil inside the duct to control the heat treatment temperature of the spiral coil, which, together with cooling by the cooling air, improves the quality of the spiral coil. It is possible to obtain the desired uniform heat-treated structure with little deformation.

The present invention has the various advantages mentioned above and is of great practical benefit.

[Brief explanation of the drawing]

Figures 1 to 3 show an example, with Figure 1 being an overall side view, Figure 2 being a plan view of the same, Figure 3 being a partially enlarged plan view of Figure 2, and Figures 4 to 10. The figures show the first embodiment of the present invention, FIG. 4 is an overall side view, and FIG.
The figure is an explanatory diagram showing the catching state and the conveying state, Fig. 6 is a partially enlarged side view of Fig. 4, Fig. 7 is a plan view of the tilting frame, and Fig. 8 is a partially simplified rear view of the holding device. A sectional view, FIG. 9 is a front view of the holding conveyor, and FIG. 10 is an irregular sectional view of the rear of the main part.
FIG. 11 is an overall side view showing a second embodiment of the present invention, and FIG. 12 is a plan view thereof. 10...Rolled wire rod, 11...Loop forming machine, 12...
Spiral coil, 12a... Loop portion, 15... Conveying device, 16... Conveying conveyor, 17... Holding device, 21
... Cart group, 22... Tilt frame, 23... Holding conveyor, 24... Air blower cart, 25... Wind road cart, 52...
Blower, 55... water mist generator, 57... wind exhaust truck.

Claims (1)

[Claims] 1. A loop forming machine that forms hot-rolled rolled wire into a spiral coil; A conveyor that conveys the spiral coil discharged from the loop forming machine at a predetermined pitch; A conveyor that conveys the spiral coil discharged from the loop forming machine at a predetermined pitch; a holding conveyor that is driven by a holding conveyor to hold each loop portion of the helical coil discharged from the loop forming machine in a predetermined forward tilted position with a predetermined distance from an adjacent loop portion; A duct that has an internal conveyance path; A blower that cools the helical coil by sending cooling air into the duct in a direction opposite to the direction in which the helical coil is conveyed;
By spraying water mist onto the spiral coil inside the duct,
A direct heat treatment apparatus for rolled wire, comprising: a water mist generator for controlling the heat treatment temperature of a helical coil;