JPS6253563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating rake-type steel material rotary conveyance device that rotates and transfers steel material having a circular cross-sectional shape, such as a columnar or cylindrical shape, which is used in a cooling bed or a heating furnace for steel material.

A certain prior art has a fixed skid on which the steel material can be placed, a chain with a dog installed in parallel with the fixed skid, and a drive means for pulling the chain with a dog. When transporting steel materials, the steel materials are rolled on fixed skids in the transport direction. In such prior art, slipping occurs at the contact surface between the dog and the steel material. As a result, the dog wears out and scratches occur on the surface of the steel material. In cases where the dog is provided with rollers for smoothly conveying the steel material, scratches also occur when scale or the like enters the rollers and the rollers become malfunctioning.

Other prior art techniques that prevent the occurrence of scratches include:
A fixed rake having a triangular or wavy steel material mounting surface, and an elevating rake installed in parallel with the fixed rake;
It has a drive means that rotates the steel material by moving the lifting rake up and down and horizontally to perform rectangular stroke motion or circular stroke motion (Special Publication No. 51).
-15830, JP-A-52-36547, JP-A-52-6924).
When transporting steel materials, the steel materials on the fixed rake are pushed up and supported all at once by the lifting rake, the lifting rake is moved horizontally to carry the steel material in the conveying direction, and then the lifting rake and the lowering are carried out. Then, the fixed rake is placed at another position along the transport direction. In such prior art, all steel materials are once lifted by a lifting rake.

However, in recent years, for the purpose of increasing the size of steel products or improving production efficiency and yield, the weight of steel materials supplied to cooling beds or heating furnaces has become increasingly required. If the weight of steel in the cooling bed or heating furnace increases, the mechanical strength of not only the fixed rake but also the lifting rake must be improved. In addition, the driving power of the lifting rake must be increased. Therefore, equipment costs increase.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to improve the mechanical strength of an elevating rake and to provide a rotary conveyance device for steel materials that can transport heavy steel materials while suppressing an increase in driving power as much as possible.

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a simplified sectional view taken along the section line - in FIG. 2. The present conveyance device 1 is applied to a cooling bed or a heating furnace. A long steel material A in the shape of a solid cylinder or a hollow cylinder (individual steel materials are collectively indicated by the reference numeral A) is transported by the entrance roller table 2 as shown by the arrow 3, and is transported to the receiving chain transfer floor. 4 is placed on the conveying device 1. The conveyance device 1 conveys the steel material A in the conveyance direction 5, and the steel material A is cooled or heated during this process. The cooled or heated steel material A is directly delivered from the conveying device 1 to the exit roller table 7 and transported in the direction of the arrow 8.

In the conveying device 1, a plurality of fixed skids 9
is a direction parallel to the conveyance direction 5 and perpendicular to the conveyance direction 5 (vertical direction in Fig. 1, horizontal direction in Fig. 3)
are placed at intervals. Fixed skid 9
A plurality of lifting rakes 10 are arranged parallel to the fixed skid 9 between them.

A driving means 11 for raising and lowering and horizontally moving the lifting rake 10 is constructed as shown in FIG. At the bottom of each lifting rake 10, legs 12a, 1
Support beams 12 and 13 are fixed via 3a. The support beams 12, 13 are spaced apart in the transport direction 5 and extend horizontally and perpendicular to the transport direction 5. At the bottom of the support beams 12 and 13, there is a rail 1 having a horizontal guide surface in the transport direction 5.
4 and 15 are fixed. The rollers 16 and 17 that support the guide surfaces of the rails 14 and 15 are
It is pivotally supported at one end of 8 and 19. The intermediate portions of the dogleg-shaped levers 18 and 19 are fixed to interlocking shafts 20 and 21 that are horizontally pivoted at fixed positions. The other ends of the levers 18 and 19 are pin-coupled to an interlocking rod 24, and the interlocking shaft 20 is rotated by a lifting hydraulic cylinder 26 via a drive lever 25.

A fixing piece 27 is fixed to the lower part of the lifting rake 10. One end of the link 28 is connected to the fixed piece 27 by a pin 29, and the other end is connected to the upper end of the lever 30 by a pin 31 above and behind the pin 29 in the conveying direction 5. The lower end of the lever 30 is connected to an interlocking shaft 32 which is horizontally pivoted at a fixed position.
is fixed to. The interlocking shaft 32 is rotated by a positioning hydraulic cylinder 34 via a lever 33. The rotational angular positions of the interlocking shaft 32 and therefore of the lever 30 are indicated by the references S1, S2.

FIG. 4 is an enlarged side view of a portion of the fixed skid 9 and the lifting rake 10. In FIG. 4, the state in which the lifting rake 10 just contacts the steel material A at a predetermined stationary position during the rising process is shown by a solid line, and the state in which the lifting rake 10 is at the upper limit position is shown by a chain double-dashed line. On the horizontal upper surface of the fixed skid 9, steel members A are arranged at equal intervals (hereinafter referred to as pitch p).
The objects are continuously loaded in the transport direction 5. The lifting rake 10 is raised and lowered while maintaining a posture parallel to the upper surface of the fixed skid 9, following an arcuate trajectory 44 that approximates a straight line 43.

In this embodiment, the lifting rake 10 is raised and lowered by drawing an arcuate trajectory 44 that approximates a linear lifting trajectory 43 between points M1 and M2, which will be described in detail later. The difference d between the vertical locus 43 and the arcuate locus 44 between points M1 and M2 can be reduced by appropriately selecting the positions of the pins 29 and 31 and the length of the link 28; As a result, it is possible to obtain a locus of arcuate motion that sufficiently approximates the linear elevation locus 43. Below, as appropriate, lifting rake 1
0 will be explained on the assumption that the ascending/descending locus 43 is followed in a straight line.

The lifting rake 10 has rotating protrusions 40 that are continuous in the conveying direction 5 at intervals equal to the pitch p. A flat portion 39 is provided between adjacent protrusions 40 . This flat portion 39 is designed to be lower than the upper surface of the fixed rake 9 even when the lifting rake 10 is at the highest position (hereinafter referred to as the upper limit position), as will be described later. The rotating protrusion 40 includes an inclined surface 41 facing upward in the conveying direction 5 and a pushing-up inclined surface 42 inclined downward from the top 45 of the upward inclined surface 41. The angle α that this push-up inclined surface 42 forms with the horizontal plane is larger than the rolling friction angle of the steel material A, and in this embodiment, α=30 degrees. The angle β that the upwardly inclined surface 41 forms with the upper surface of the fixed skid 9 is
The relationship β≦θ must be established between the angle θ (θ=75 degrees as described later) that the linear vertical locus 43 of 0 and the upper surface of the fixed skid 9 forms. The reason is that the lifting trajectory 43 of the lifting rake 10
This is to prevent the upwardly inclined surface 41 from coming into contact with the steel material A when extending and descending. In order to improve the strength of the rotating protrusion 40, the angle β should be made as small as possible, but in this embodiment, β=
Let it be θ.

Here, if the angle θ that the lifting locus 43 of the lifting rake 10 forms with the top surface of the fixed skid 9 is γ, and the included angle between the top surface of the fixed skid 9 and the push-up inclined surface 42 is γ, then θ=γ/2=( Select 180°−α)/2.
The reason for this is explained below.

The push-up inclined surface 42 contacts the outer circumferential surface of the steel material A mounted on the upper surface of the fixed skid 9 in the conveying direction 5 behind the vertical line passing through the centroid G of the steel material A, and lifts the steel material A onto the upper surface of the fixed skid 9. Push up along the direction and apply rotational force to steel material A. Therefore, steel material A is fixed skid 9
It is rolled and conveyed in the conveying direction 5 on the upper surface of the sheet.

In FIG. 4, when the lifting rake 10 is just in contact with the steel material A during the rising process, K is the contact point between the stationary steel material A and the upper surface of the fixed skid 9, and the contact point between the push-up inclined surface 42 and the steel material A is The contact point is indicated by M1. Further, at the upper limit position of the lifting rake 10 shown by the two-dot chain line, the contact point between the steel material A and the upper surface of the fixed skid 9 is L, the contact point between the push-up slope 42 and the steel material A is N, and the push-up slope 42 Contact point M1 at
The point at which the point has moved to the upper limit position is indicated by M2.

In order for the steel material A to contact the upper surface of the fixed skid 9 and the push-up inclined surface 42 and roll without slipping on both contact surfaces, the length between points K and L on the upper surface of the fixed skid 9, that is, the lifting rake 10 The distance that the steel material A is conveyed by one lift of
must be equal to the length 2 of the part that contacts steel material A. That is, =2...(1) Also, the straight line connecting points K and L on the upper surface of fixed skid 9 and the straight line connecting points M1 and N are parallel and have the same length. In other words, =1...(2) From equations (1) and (2), 1=2...(3) In other words, a triangle connecting three points N, M1, and M2 has point N as its vertex and two points M1 and M2 as Connecting straight line 1
This forms an isosceles triangle with base 2. The straight line 12 is parallel to the lifting direction 43 of the lifting rake 10, and ∠NM1M2=∠NM2M1=θ...(4) Since the sum of the interior angles of the triangle is 180 degrees, in isosceles triangles N, M1, and N2, α+2θ=180 ° ...(5) θ = 1/2 (180 ° - α) ...(6) Here, the upper surface of the fixed skid 9 and the push-up inclined surface 42
Since the included angle formed by γ=180°−α, θ=1/2γ …(7).

Therefore, the lifting trajectory 43 of the lifting rake 10
is the angle θ formed with the upper surface of the fixed skid 9
If it is taken to be 1/2 of the included angle γ between the upper surface of the fixed skid 9 and the push-up inclined surface 42, the upper surface of the fixed skid 9 and the pushed-up inclined surface 42 become equal to 1. The steel material A is rotated and conveyed while being in rolling contact with the upper surface of the fixed skid 9 and the push-up inclined surface 42 without slipping.

The interval at which the steel material A is mounted on the upper surface of the fixed skid 9, that is, the pitch p, is selected so as to satisfy the following conditions (1) to (3). That is, (1) the steel materials A are spaced apart so that the steel materials A do not come into contact with each other; (2) The distance should be such that the transport device 1 does not become uneconomically large. (3) Upward inclined surface 41 of the lifting rake 10
A distance e as shown in FIG. 4 is ensured so that the steel material A does not come into contact with the steel material A.

Taking these conditions (1) to (3) into consideration, the pitch p is determined to be approximately 1.5 times the maximum diameter D of the steel material A to be transported (p≈1.5D...(8)). Further, the conveyance distance of the steel material A by one lifting and lowering of the lifting rake 10 is selected to be 1/2 of the pitch p. That is, =1=2=1/2p...(9).

Here, the rotation angle φ of the steel material A having the maximum diameter D to be conveyed by one lifting and lowering of the lifting rake 10 will be explained.

φ=360゜×KL/πD …(10) Substituting the relationship of formulas (8) and (9) into formula (10), φ≒360×1.5D/2πD=86゜≒90゜ …(11) p If it is ≒1.5D, steel material A will be transported while being rotated approximately 90 degrees at a time.

The shape of the lifting rake 10 is determined by the following conditions (1) to (4). That is, (1) the angle α is larger than the rolling friction angle of the steel material A (in this example, α=30 degrees).
(2)=1=2=1/2p. (3) The contact point M1 between the steel material A and the push-up inclined surface 42 is the centroid G of the steel material A.
It is located below and rearward in the conveyance direction. (4) The flat portion 39 must be located below the upper surface of the fixed skid 9 at a distance f at the upper limit position of the lifting rake 10.

In addition, in practical terms, it is preferable that the length of the push-up inclined surface 42 is made to have a margin behind the contact point M1 with the steel material A in the conveyance direction.

In this embodiment, the upper surface of the fixed skid 9 is horizontal, and since the push-up inclined surface 42 makes an angle α=30 degrees with respect to the horizontal plane, the angle γ=180−
30=150 degrees, and the angle .theta. that the elevation locus 43 forms with the upper surface of the fixed skid is 1/2.times.150=75 degrees. Further, the angle β=θ=75 degrees that the upwardly inclined surface 41 forms with the upper surface of the fixed skid 9 is made.

Lifting rake 1 driven by drive means 11
0, the angle θ formed with the upper surface of the fixed skid 9 is equal to 1 of the angle γ, at least in the section from when the lifting rake 10 contacts the steel material A until it reaches the upper limit position, that is, between points M1 and M2. It is desirable that the height corresponds to the linear vertical locus 43 which is /2. By doing so, it is possible to eliminate slippage between the steel material A, the upper surface of the fixed skid 9, and the push-up inclined surface 42, as described above.

The operation will be explained with reference to FIG. First of all,
The lever 3 is moved by the positioning hydraulic cylinder 34.
0 is set at the rotation angle position S1, and the lifting hydraulic cylinder 26 is extended to the state shown in FIG. 51. At this time, the lifting rake 10 is at the lowest position (hereinafter referred to as the lower limit position). The steel materials A1 to A4 are mounted on the upper surface of the fixed skid 9 at a pitch p.

Next, as the lifting hydraulic cylinder 26 is reduced, the lifting rake 10 remains horizontal and rises while following an arcuate trajectory 44 centered on the pin 31 and having a radius equal to the distance between the centers of the pins 29 and 31. As a result, the state shown in FIG. 52 is reached. Lifting rake 10
The push-up inclined surface 42 is in just contact with the lower surface of the steel materials A1 to A4 mounted on the upper surface of the fixed skid 9. At this time, the contact point M1 on the push-up inclined surface 42 is located below and behind the centroid G of each of the steel materials A1 to A4 in the conveying direction 5.

As the lifting hydraulic cylinder 26 is further reduced, the lifting rake 10 further rises and reaches its upper limit position, resulting in the state shown in FIG. 5. Steel materials A1 to A4
rotates the upper surface of the fixed skid 9 in the conveyance direction 5 while its lower surface is pushed up by the push-up inclined surface 42. The rising speed of the lifting rake 10 is set to such an extent that the steel materials A1 to A4 do not roll too much due to inertial force. For example, the steel material is stopped leaving a gap e as shown in FIG. However, even if the rising speed of the lifting rake 10 is too high, the steel material A hits the upwardly inclined surface 41 of the rotating protrusion 40 and stops. In this way, the steel materials A1 to A4 are rotationally conveyed forward in the conveyance direction 5 by p/2.

As mentioned above, while the lifting rake 10 reaches the upper limit position shown in FIG. 5 2 from the position shown in FIG. 5 3, the steel materials A1 to A4 are rotated and conveyed.
Most of the weight of 4 is always borne by the fixed skid 9. Therefore, an increase in the strength of the lifting rake 10 and the driving power for the lifting rake 10 can be suppressed.

Next, the lifting hydraulic cylinder 26 is extended to bring the lifting rake 10 to the state shown in FIG. 51, that is, to the lower limit position. After that, the positioning hydraulic cylinder 3
4, the lever 30 is rotated from the angular position S1 to S2.
is set, and the lifting rake 10 is advanced by p/2 forward in the conveyance direction 5 from the state shown in FIG. This state is shown in FIG. 5.

Therefore, the lifting hydraulic cylinder 26 is reduced, the lifting rake 10 is raised, and the state shown in FIG.
Set the state as shown in FIG. During the ascent of the elevating rake 10, the steel materials A1 to A4 are rotated and conveyed forward in the conveying direction 5 by p/2. In the state of Fig. 5 6,
The steel material A1 is delivered to the exit roller table 7,
It is carried in the direction of arrow 8 as shown in FIG. Subsequently, as shown in FIG. 5, the lifting rake 10 at the upper limit position is lowered to the lower limit position. At the same time, by extending the positioning hydraulic cylinder 34 and returning the lever 30 from the rotation angle position S2 to S1, the lifting rake 10 is retreated by p/2 in the direction opposite to the conveying direction 5. In this way, the state shown in FIG. 51 is restored. During this time, a new steel material A5 is transported by the entry roller table 2 and transferred to the receiving chain transfer shaft 4.
is mounted on the upper surface of the fixed skid 9. The operations are repeated from FIG. 5 1 to FIG. 5 6, and the steel material A
2 to A5 are conveyed while being rotated on a fixed skid 9.

FIG. 6 is a plan view of another embodiment of the present invention,
FIG. 7 is a sectional view seen from the side, and FIG. 8 is a sectional view taken along the section line - of FIG. 71. In this embodiment, the same reference numerals are used for corresponding parts as in the previous embodiment described in connection with FIGS. 1-5. A pair of elevating rakes corresponding to the elevating rake 10 of the embodiment shown in FIGS. 1 to 5 and corresponding parts related thereto are designated with suffixes a and b.

In the conveying device 1, a plurality of fixed skids 9
is parallel to and along the conveying direction 5.
They are arranged at intervals in a direction perpendicular to (vertical direction in FIG. 6, horizontal direction in FIG. 8). Between each fixed skid 9, a plurality of pairs of lifting rakes 10a and 10b are arranged parallel to the fixed skid 9.

The driving means 60 for raising and lowering the lifting rakes 10a and 10b is constructed as follows. The lower part of each lifting rake 10a is fixed to support beams 63, 64 via legs 61, 62. support beam 63,
Rails 65 and 66 having guide surfaces horizontal to the conveyance direction 5 are provided at the lower part of the conveyance direction 5 . Similarly,
Each lifting rake 10b is fixed to support beams 69, 70 via legs 67, 68, and
70 is provided with rails 71 and 72. The rollers 73, 74; 75, 76 that support the guide surfaces of the rails 65, 66; 71, 72 are connected to the Y-shaped lever 7.
It is pivotally supported by both arms of 7 and 78. The Y-shaped levers 77, 78 are fixed to interlocking shafts 79, 80 which are horizontally pivoted in fixed positions. Y-shaped lever 77,7
The lower end of 8 is pin-coupled to an interlocking rod 82.
The interlocking shaft 79 is rotated by a lifting hydraulic cylinder 84 via a drive lever 83.

Fixing pieces 86 and 87 are fixed to the lower portions of the lifting rakes 10a and 10b. One end of the links 88, 89 is connected to the fixed pieces 86, 87 by pins 90, 91, and the other end is connected to the upper end of a bracket 92 provided at a fixed position by pins 90, 91.
It is pin-coupled by a pin 93 above and rearward in the conveying direction 5. Lifting rake 10a, 10b
is half p/ of the mounting pitch p of steel material A in the conveyance direction 5.
They are set at two different locations.

The lifting means 60 drives the lifting rakes 10a, 10b up and down so that when one goes up, the other goes down, while keeping the lifting rakes 10a, 10b horizontal.

The operation will be explained with reference to FIGS. 9 and 7. The steel materials A1 to A4 are placed on the upper surface of the fixed skid 9 at a pitch p as shown in FIG. 91. First, as shown in FIG. 9, the lifting rakes 10a and 10b are set at the same height position (this same height position will be referred to as a neutral position). For this purpose, Figure 7 1
Adjust the extension/contraction length of the lifting hydraulic cylinder 84 to the neutral position as shown in FIG.

Next, as shown in FIG. 7 2, the hydraulic cylinder 84 for lifting
When further reduced, one lifting rake 10
a rises while maintaining a horizontal state while tracing an arcuate locus 44a centered on pin 93 and having a radius equal to the distance between the centers of pins 90 and 91. During this upward movement, the upward slope 4 of the lifting rake 10a
2a pushes up and rotates the steel materials A1 to A4.
By the time the elevating rake 10a reaches the upper limit position, the steel materials A1 to A4 have changed to p/2 as shown in FIG.
is transported in the transport direction 5. At the same time, the other lifting rake 10b is lowered.

Therefore, as shown in Fig. 7, the lifting hydraulic cylinder 8 is
4, one lifting rake 10a goes down and the other lifting rake 10b goes up. As the lifting rake 10b rises, the steel materials A1 to A4 are pushed up on the inclined surface 4 of the lifting rake 10b.
It is pushed up by 2b and rotates. By the time the lifting rake 10b reaches the upper limit position, the steel materials A1 to A
4 is transported in the transport direction by p/2 as shown in FIG. 9. In the state shown in FIG. 9, the steel material A1 is delivered to the exit roller table 7 and conveyed in the direction of the arrow 8. Subsequently, by adjusting the telescopic length of the lifting hydraulic cylinder 84 to the neutral position, the lifting rakes 10a, 10b are placed in the neutral position, returning to the states shown in FIG. 71 and FIG. 91. During this time, a new steel material A5 is carried by the entry roller table 2 and loaded onto the upper surface of the fixed skid 9 by the receiving chain transfer 4. Thereafter, the steel materials A2 to A5 are conveyed while rotating on the fixed skid 9 by repeating the operations shown in FIGS. 91 to 93.

Note that the arcuate movement trajectories 44a, 44b of the lifting rakes 10a, 10b turn into linear lifting trajectories 43a, 43b between points M1a, M2a; M1b, M2b, as in the embodiments of FIGS. By appropriately selecting the positions of the pins 90, 91, 93 and the lengths of the links 88, 89, it is possible to obtain a locus of arcuate motion sufficiently close to a straight line.

In the embodiment described in connection with FIGS. 6 to 9 above, the positions of the lifting rakes 10a and 10b along the conveyance direction 5 are fixedly determined by the pins 93, so that the operation cycle is shortened. Ru.

The driving means 11, 60 are the dogleg-shaped levers 18, 19 described in connection with FIGS. 1 to 5,
Alternatively, the lifting rakes 10, 10a, 10b are driven with movement trajectories sufficiently close to the linear lifting trajectories 43, 43a, 43b, without being limited to the Y-shaped levers 77, 78 described in connection with FIGS. 6 to 9. The driving source is not limited to a hydraulic cylinder as long as it can be used.

The pins 31 and 93 can also be arranged so as to be located below the pins 29, 90 and 91 and in front of the conveyance direction 5.

The upper surface of the fixed skid 9 may also be a substantially horizontal surface inclined at an angle of inclination much smaller than the rolling friction angle of the steel material.

As described above, according to the present invention, when rotating the steel material on the fixed skid, the contact between the steel material, the upper surface of the fixed skid, and the pushing-up inclined surface of the lifting rake can be made into rolling contact without slipping. In addition, it is possible to prevent the occurrence of scratches on the surface of the steel material, and also to minimize the wear on the upper surface of the fixed skid and the push-up inclined surface. In addition, the structure is simple because the elevating rake only needs to be continuously formed with protrusions having upward slopes. Furthermore, since the stroke motion of the lifting rake is a vertical motion such as a straight line or an arc approximating a straight line, the structure of the driving means is simple. Furthermore, most of the weight of the steel is always supported by the fixed skids,
The load on the lifting rake is relatively small, as only the force required to rotate the steel material against its rolling friction is sufficient. Therefore, there is no need to increase the strength of the lifting rake to a level that can sufficiently support the weight of all the steel materials, and the power required to drive the lifting rake required to rotate the steel material is relatively small, reducing equipment costs. It is possible to reduce operating costs. Furthermore, by driving the pair of lifting rakes while being shifted from each other in the transport direction, it is possible to simplify the operation control of each lifting rake and shorten the operating cycle. Also, even for the largest diameter steel items to be transported,
One lifting and lowering of the lifting rake removes at least 90% of the steel material.
Because it is transported while being rotated at an angle close to
It is possible to obtain a straightening effect through rotation to prevent deformation such as sagging of the high-temperature steel material during transportation.

[Brief explanation of the drawing]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a simplified sectional view taken along the cutting plane line - of FIG. 2, and FIG. 4 is a fixed skid 9.
FIG. 5 is a side view for explaining the operation, FIG. 6 is a plan view of another embodiment of the present invention, and FIG. 7 is a side view of the lifting rake 10. 8 is a sectional view taken along the cutting plane line - of FIG. 7 and 1, and FIG. 9 is a side view for explaining the operation. DESCRIPTION OF SYMBOLS 1... Conveying device, 5... Conveying direction, 9... Fixed skid, 10, 10a, 10b... Lifting rake, 11, 60... Driving means, 26, 84... Hydraulic cylinder for lifting, 34... Position Hydraulic cylinder for alignment, 40...Rotation protrusion, 41...Upward inclined surface, 42, 42a, 42b...Push-up inclined surface, 43, 43a, 43b...Linear vertical locus,
44, 44a, 44b...Circular ascending and descending locus, A,
A1 to A4...Steel material, G...Centroid, α...Angle that the push-up inclined surface makes with the horizontal plane, θ...Angle that the linear lifting trajectory makes with the top surface of the fixed skid,
γ...Included angle formed by the upper surface of the fixed skid and the push-up inclined surface, φ...The rotation angle of the steel material due to one lifting and lowering of the lifting rake.

Claims (1)

[Scope of Claims] 1. A fixed skid having a substantially horizontal mounting surface on which a steel material can be mounted, and protrusions having push-up slopes at equal intervals in the conveyance direction are continuously formed, and the push-up slopes are , the steel material is tilted downward in the transport direction and the angle formed with the horizontal plane is larger than the rolling friction angle of the steel material, and is placed on the upper surface of the fixed skid at a position rearward in the transport direction from a vertical line passing through the centroid of the steel material during the ascent. The part that contacts and connects each protrusion is located below the upper surface of the fixed skid at the upper limit position, and the lifting rake is placed in line with the fixed skid, and the lifting rake is sandwiched between the pushing-up inclined surface and the upper surface of the fixed skid. An elevating rake characterized by comprising a drive means for reciprocating the elevating rake diagonally upward in the conveying direction at an angle of 1/2 of the corner, and for setting the elevating rake to reciprocate horizontally in the conveying direction by a certain distance at the lower limit position. type steel rotating conveyance device. 2. A fixed skid having a substantially horizontal mounting surface on which a steel material can be mounted, and protrusions having push-up slopes at equal intervals in the conveyance direction are continuously formed, and the push-up slopes are arranged downward in the conveyance direction. It is inclined and the angle formed with the horizontal plane is larger than the rolling friction angle of the steel material, and while rising, it contacts the steel material mounted on the upper surface of the fixed skid behind the vertical line passing through the centroid of the steel material in the conveying direction, and each protrusion A pair of lifting rakes, whose connecting part is below the top surface of the fixed skid and are arranged in line with the fixed skid and shifted by a certain distance in the transport direction, and a pair of lifting rakes that connect the lifting rakes to the inclined surface and the top surface of the fixed skid. An elevating rake type steel material characterized by comprising a driving means for reciprocating the elevating rake diagonally upward in the transport direction at an angle of 1/2 of the included angle between the elevating rake and the elevating rake and for lowering the other elevating rake while the other elevating rake is rising. Rotary conveyance device.