JP2012148318A - Steel material carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel material carrier device, whose constitution can be simplified and which can be reduced in size.SOLUTION: In the carrier device, an upstream first hydraulic cylinder 20 of a first carrier unit 14 and an upstream second hydraulic cylinder 38 of a second carrier unit are connected to a first hydraulic pump 54 to constitute an upstream side lifting device 58. A downstream first hydraulic cylinder 22 of the first carrier unit 14 and a downstream second hydraulic cylinder 40 of a second carrier unit are connected to a second hydraulic pump 64 to constitute a downstream side lifting device 68. The first hydraulic pump 54 and the second hydraulic pump 64 are operated normally or reversely, so that a first movable beam 28 of the first carrier unit 14 and a second movable beam 46 of the second carrier unit 16 move upward and downward alternately.

Description

  The present invention relates to a conveying device for conveying a steel material.

  In the rolling process, a long rolled material rolled from one steel slab to a required cross-sectional dimension is cut hot with a shear or the like, and used as a steel material having a required length for a cooling process in a cooling bed. As a transport device used for transporting steel on the cooling floor, a fixed beam and a movable beam are arranged in parallel along the transport direction of the steel, and the movable beam is raised, moved forward, lowered and moved backward. There is known a walking beam type conveying device that conveys a steel material by making it (see, for example, Patent Document 1). The movable beam in the transfer device is lifted from a lower position with respect to the fixed beam on which the steel material is placed, receives the steel material to the movable beam, advances the movable beam by one pitch at the rising end, The steel material is intermittently conveyed one pitch at a time by lowering the movable beam, delivering the steel material to the fixed beam, and repeating the operation of retracting the movable beam at the lower end below the fixed beam.

Japanese Utility Model Publication No. 56-170125

  Here, in order to reduce the load applied to the lifting device that moves the movable beam up and down, the movable beam, the fixed beam, and the movable beam lifting device with a reduced length and a reduced number of steel materials placed at one time, A transport device is configured by connecting two transport units each having a longitudinal movement device in series in the transport direction. In this case, in order to operate the movable beam on the upstream side and the movable beam on the downstream side in synchronization, the movable beams are linked via a link mechanism, and an eccentric wheel rotated by a drive motor is connected to the link mechanism. It is conceivable that the upstream movable beam and the downstream movable beam operate in synchronization with each other.

  However, in the configuration in which the upstream movable beam and the downstream movable beam are linked using a mechanical link mechanism, it is pointed out that the configuration of the lifting device is complicated and the lifting device is enlarged. In addition, the use of the link mechanism increases the number of parts, which causes a decrease in maintainability. Furthermore, since the weight of the conveying device itself increases with the increase in the size of the lifting device, it is necessary to construct a foundation that can withstand the weight of the device when it is installed, which increases the installation cost. In addition, since the transport device forms a foundation by digging a pit on the factory floor and the lifting device is installed in the pit in the accommodated state, the height of the lifting device is increased, so that the depth of the pit is increased. It is also pointed out that there is a problem that the construction cost increases and the cost for construction increases.

  That is, the present invention has been proposed in order to solve the above-mentioned problems inherent in the conventional steel material conveying device, and is a steel material conveying device that can be simplified in size and reduced in size. The purpose is to provide.

In order to overcome the above-mentioned problems and achieve the intended purpose, a steel material conveying apparatus according to the invention of claim 1 is provided:
A fixed beam capable of supporting a steel material, two movable beams that are positioned parallel to the fixed beam and displaced in the front and rear directions of the steel material, and capable of supporting the steel material, and an elevation that moves the movable beam up and down An apparatus and an advancing / retreating means for moving the movable beam back and forth in the conveying direction of the steel material, and moving the movable beam by the elevating device and the advancing / retreating means to convey the steel material alternately supported by the movable beam and the fixed beam In walking beam type transport device,
The lifting device is
A single-acting first hydraulic cylinder connected to the first movable beam upstream in the transport direction, a single-acting second hydraulic cylinder connected to the second movable beam downstream in the transport direction, and the first hydraulic pressure A cylinder and a second hydraulic cylinder connected to each other, and a hydraulic pump that is driven forward / reversely by an electric motor, the hydraulic path of the lifting device is configured to form a closed circuit,
The gist is that the first movable beam and the second movable beam are alternately moved up and down by forward and reverse rotation of the hydraulic pump.

According to the first aspect of the present invention, since the lifting device is configured by a closed circuit in which each of the hydraulic cylinders connected to each movable beam is connected to the hydraulic pump, the configuration of the lifting device is simplified and the size can be reduced. In addition, the number of parts is reduced and the maintainability is improved. Further, the lifting device can be reduced in weight, and the foundation construction cost can be reduced. Furthermore, the pits to be dug when installing the lifting device can be shallow enough to accommodate the hydraulic cylinder, and the construction cost can be reduced.
Furthermore, since the two hydraulic cylinders are connected to a common hydraulic pump so as to form a closed circuit, the operations of the movable beams can be easily synchronized. Further, the external force applied to one hydraulic cylinder can be regenerated as power to assist the rotation of the hydraulic pump that rotates in the direction of supplying hydraulic oil to the other hydraulic cylinder, and the load on the electric motor can be reduced.

The gist of the invention of claim 2 is that the length of each hydraulic path to the two hydraulic cylinders is made the same with respect to the hydraulic pump.
According to the second aspect of the present invention, since the hydraulic paths of the two hydraulic cylinders connected to the hydraulic pump are set to the same length, the operations of the two movable beams can be accurately synchronized.

According to a third aspect of the present invention, a plurality of the lifting devices are provided, and the first hydraulic cylinder and the second hydraulic cylinder of the plurality of lifting devices are spaced from the corresponding first movable beam and second movable beam. Connected to the position
The gist is that the number of rotations of the hydraulic pump can be varied by controlling the drive of the electric motors of the lifting devices so that the hydraulic cylinders connected to the same movable beam operate synchronously at the same speed. .
According to the invention of claim 3, the movable beam can be moved up and down in parallel.

  According to the steel material conveying device of the present invention, the configuration can be simplified and the size can be reduced.

It is a top view which shows schematic structure of the conveying apparatus which concerns on an Example. It is a side view which shows schematic structure of the conveying apparatus which concerns on an Example, Comprising: The 1st movable beam of a 1st conveyance unit raises, and the state where the 2nd movable beam of a 2nd conveyance unit is falling is shown. It is a side view which shows schematic structure of the conveying apparatus which concerns on an Example, Comprising: The 1st movable beam of a 1st conveyance unit falls, and the state where the 2nd movable beam of a 2nd conveyance unit is raising is shown. It is a control block diagram of the conveying apparatus which concerns on an Example.

  Next, a steel material conveying apparatus according to the present invention will be described below with reference to the accompanying drawings by way of preferred examples.

  As shown in FIG. 1, the transport apparatus 12 for the steel material 10 according to the embodiment includes two transport units 14 and 16 arranged in series in the transport direction of the steel material 10, and includes a first transport unit 14 on the upstream side and a downstream side. In each of the second transport units 16 on the side, the steel material 10 is transported in a direction intersecting the longitudinal direction of the steel material 10, and the steel material 10 can be delivered from the first transport unit 14 to the second transport unit 16. . The transfer device 12 of the embodiment is configured to move movable beams 28 and 46 to fixed beams 30 and 50 which are fixedly arranged, which will be described later, and four lifting devices 58, 58, 68, 68 which will be described later and four electric cylinders 32. , 32, 48, 48, the walking beam type transports the steel material 10 while alternately supporting the steel material 10 with the movable beams 28, 46 and the fixed beams 30, 50.

  The first transport unit 14 includes a pair of first elevating members 18 and 18 extending in the transport direction so as to be spaced apart from each other in parallel in the transverse direction intersecting the transport direction. Below each first elevating member 18, single-acting first hydraulic cylinders 20, 22 composed of ram cylinders or the like constituting elevating devices 58, 68 are installed apart from each other in the conveying direction, and are located upstream. A piston rod 20a extending upward of the upstream first hydraulic cylinder 20 is connected to the upstream end of the first elevating member 18, and a piston rod extending upward of the downstream first hydraulic cylinder 22 located on the downstream side. 22 a is connected to the downstream end of the first elevating member 18. That is, by operating the four first hydraulic cylinders 20, 20, 22, and 22 in synchronization, the pair of first elevating members 18 and 18 move up and down while maintaining a parallel posture, and a first described later. The movable beam 28 has a lowered position where the upper surface of the first movable beam 28 is positioned below the upper surface of the first fixed beam 30 described later, and the upper surface of the first movable beam 28 is higher than the upper surface of the first fixed beam 30. It is comprised so that it may raise / lower between the raising positions located in (refer FIG. 2, FIG. 3).

  A first feed member 24 formed in a rectangular frame shape above the pair of first elevating members 18, 18 has a plurality of rollers 26 for each first elevating member 18 as shown in FIGS. 2 and 3. And is movably mounted along the transport direction. On the upper surface of the first feed member 24, as shown in FIG. 1, a plurality of first movable beams 28 whose lengths extend in the transport direction are arranged side by side in the lateral direction. As shown in FIGS. 2 and 3, recesses 28a capable of supporting the steel material 10 are formed on the upper surface of each first movable beam 28 at a predetermined pitch in the longitudinal direction. Further, the first transport unit 14 has a first fixed beam 30 fixed to the floor surface on which the transport device 12 is installed via legs (not shown) spaced apart above the first feed member 24. Adjacent to and parallel to each first movable beam 28. On the upper surface of each first fixed beam 30, similarly to the first movable beam 28, recesses 30 a that can support the steel material 10 are formed at the same pitch as the formation pitch of the recesses 28 a in the first movable beam 28. It should be noted that when the first movable beam 28 is raised to the raised position by the first hydraulic cylinders 20, 20, 22, 22, both 24, 30 are provided so that the first feed member 24 does not contact the first fixed beam 30. The spacing interval is set. The shape of the recesses 28a and 30a is set according to the cross-sectional shape of the steel material 10 to be transported and the processing mode such as rotating the steel material 10 without transporting it in the same recess 28a and 30a.

  A first electric cylinder (advancing / retracting means) 32 disposed on the first elevating members 18 and 18 through two frames spaced apart in the lateral direction on the upstream side in the conveying direction of the first feeding member 24. The piston rod 32a is connected. Then, by operating the pair of first electric cylinders 32 and 32 in synchronization, the plurality of first movable beams 28 together with the first feeding member 24 advance and retract along the transport direction with respect to the first elevating members 18 and 18. Configured to move. The pair of first electric cylinders 32, 32 move (advance) the first feed member 24 forward in the conveying direction at the raised position of the first movable beam 28, and perform the first feed at the lowered position of the first movable beam 28. The operation is controlled by the controller 34 (FIG. 4) so as to move (retreat) the member 24 to the rear side in the transport direction. That is, by operating the four first hydraulic cylinders 20, 20, 22, 22 and the pair of first electric cylinders 32, 32 at a predetermined timing, the first movable beam 28 is moved upward, forward, downward, A series of backward movements (box motion) can be applied. Each first electric cylinder 32 is configured to be able to adjust the advance / retreat amount of the piston rod 32a so that the advance / retreat amount of the first feed member 24 (first movable beam 28) can be adjusted.

  The basic configuration of the second transport unit 16 is the same as the configuration of the first transport unit 14, and will be described briefly. That is, the piston rods 38a and 40a of the upstream second hydraulic cylinder 38 and the downstream second hydraulic cylinder 40 that constitute the lifting devices 58 and 68 are connected to the pair of second lifting members 36 and 36 that are separated in the lateral direction. Has been. A rectangular frame-shaped second feed member 44 is placed on the upper side of the pair of second elevating members 36, 36 via a plurality of rollers 42 so as to be movable along the transport direction, and the second feed member 44. A plurality of second movable beams 46 are arranged side by side in the lateral direction on the upper surface of the. Piston rods of two second electric cylinders (advancing / retracting means) 48, 48 disposed on the second elevating members 36, 36 and controlled by the controller 34 at the downstream end of the second feed member 44. 48a and 48a are connected. That is, by operating the four second hydraulic cylinders 38, 38, 40, 40 and the pair of second electric cylinders 48, 48 at a predetermined timing, the second movable beam 46 is moved up-forward-down-backward. A series of operations (box motion) can be given. In the first transport unit 14 and the second transport unit 16, when the first movable beam 28 of the first transport unit 14 rises from the lowered position to the raised position due to the circuit configuration of the lifting devices 58 and 68 described later. When the second movable beam 46 of the second transport unit 16 is lowered from the raised position to the lowered position and the first movable beam 28 of the first carrier unit 14 is lowered from the raised position to the lowered position, the second carrier unit Sixteen second movable beams 46 are raised from the lowered position to the raised position. That is, the first movable beam 28 and the second movable beam 46 alternately move up and down.

  As shown in FIG. 1, the first movable beam 28 of the first transport unit 14 and the second movable beam 46 of the second transport unit 16 are arranged so as to be shifted in the lateral direction, and both the movable beams 28 are transported when the steel material is transported. , 46 do not interfere with each other. The second transport unit 16 includes a second fixed beam 50 aligned with each of the first fixed beams 30 in the transport direction, and the second movable beam 46 and the second fixed beam 50 are arranged on the top surfaces of the first fixed beam 30. Similar to the movable beam 28 and the first fixed beam 30, the recesses 46a and 50a capable of supporting the steel material 10 are formed at the same pitch. The forward end position of the first movable beam 28 and the backward end position of the second movable beam 46 are set so as to overlap in the lateral direction, and the steel material 10 sent to the second fixed beam 50 by the first movable beam 28. Is received and conveyed by the second movable beam 46. The first hydraulic cylinders 20 and 22 of the first transfer unit 14 and the second hydraulic cylinders 38 and 40 of the second transfer unit 16 are all piston rods 20a, 22a, 38a, 40a by stoppers provided in the cylinder body. Is regulated so as to move by the same length between the upper end position and the lower end position.

  Next, the hydraulic circuit of the lifting devices 58, 58, 68, 68 for moving the movable beams 28, 46 up and down in the first transport unit 14 and the second transport unit 16 will be described. The configuration of the hydraulic circuit of the two lifting devices 58 and 68 that move up and down one first lifting member 18 in the first transport unit 14 and one second lifting member 36 in the second transport unit 16 is as follows. The configuration of the hydraulic circuit of the two lifting devices 58 and 68 that move up and down the other first lifting member 18 in the first transport unit 14 and the second second lifting member 36 in the second transport unit 16 is the same. Therefore, only the configuration of the hydraulic circuit of the lifting device 58, 68 on one side will be described, and the parts constituting the hydraulic circuit of the lifting device 58, 68 on the other side will be denoted by the same reference numerals. . Moreover, the raising / lowering members corresponding to the 1st conveyance unit 14 and the 2nd conveyance unit 16 point out the raising / lowering members 18 and 36 currently aligned in the conveyance direction of the steel material 10. FIG.

  As shown in FIG. 2, the upstream first hydraulic cylinder 20 of the first transport unit 14 has an upstream first pipe (hydraulic path) 52 having one end connected to a port provided on the bottom side of the cylinder body in the cylinder 20. Is connected to the first oil port 54a of the first hydraulic pump 54, and one end of the upstream second hydraulic cylinder 38 of the second transport unit 16 is connected to a port provided on the bottom side of the cylinder body in the cylinder 38. Is connected to the second oil port 54b of the first hydraulic pump 54 via the upstream second pipe (hydraulic path) 56. That is, the upstream first hydraulic cylinder 20, the first hydraulic pump 54, and the upstream second hydraulic cylinder 38 are connected in a closed circuit with the upstream first pipeline 52 and the upstream second pipeline 56 to connect the upstream lifting device. 58 is configured. The first hydraulic pump 54 is configured to be driven forward / reversely by a first electric motor (electric motor) 60 such as an inverter motor that can be controlled at a variable speed by the controller 34, and the rotation of the first hydraulic pump 54. By switching the direction, the hydraulic oil can be selectively supplied to the upstream first hydraulic cylinder 20 or the upstream second hydraulic cylinder 38.

  That is, when the first elevating member 18 (first movable beam 28) is lifted by extending the pinton rod 20a of the upstream first hydraulic cylinder 20 of the first transport unit 14 as shown in FIG. The external hydraulic force applied to the upstream second hydraulic cylinder 38 of the unit 16 (the weight of the second elevating member 36, the second feed member 44, the second movable beam 46, the steel material 10 and the like) from the upstream second hydraulic cylinder 38 to the first hydraulic pump 54. The pressure at which the hydraulic oil is returned to is regenerated as power that assists the rotation of the first hydraulic pump 54 that rotates in the direction in which the hydraulic oil is supplied from the first hydraulic pump 54 to the upstream first hydraulic cylinder 20. Conversely, as shown in FIG. 3, when the piston rod 38a of the second upstream hydraulic cylinder 38 of the second transport unit 16 is extended and the second elevating member 36 (second movable beam 46) is raised, The first hydraulic pressure from the upstream first hydraulic cylinder 20 by the external force applied to the upstream first hydraulic cylinder 20 of one transport unit 14 (the weight of the first elevating member 18, the first feed member 24, the first movable beam 28, the steel material 10, etc.). The pressure for returning the hydraulic oil to the pump 54 is regenerated as power for assisting the rotation of the first hydraulic pump 54 that rotates in the direction in which the hydraulic oil is supplied from the first hydraulic pump 54 to the upstream second hydraulic cylinder 38. Based on the first hydraulic pump 54, the length of the upstream first pipeline 52 reaching the upstream first hydraulic cylinder 20 and the length of the upstream second pipeline 56 leading to the upstream second hydraulic cylinder 38 are set to be the same. The upstream first hydraulic cylinder 20 and the upstream second hydraulic cylinder 38 are well balanced in pressure.

  As shown in FIG. 2, the downstream first hydraulic cylinder 22 of the first transport unit 14 has a downstream first pipe (hydraulic path) 62 having one end connected to a port provided on the bottom side of the cylinder body in the cylinder 22. To the first oil port 64a of the second hydraulic pump 64, and one end of the downstream second hydraulic cylinder 40 of the second transport unit 16 is connected to a port provided on the bottom side of the cylinder body in the cylinder 40. The second hydraulic port 64 b of the second hydraulic pump 64 is connected to the downstream second pipe (hydraulic path) 66. That is, the downstream first hydraulic cylinder 22, the second hydraulic pump 64, and the downstream second hydraulic cylinder 40 are connected to form a closed circuit at the downstream first pipeline 62 and the downstream second pipeline 66, and the downstream lifting device 68 is connected. Is configured. The second hydraulic pump 64 is configured to be driven forward / reversely by a second electric motor (electric motor) 70 such as an inverter motor that can be controlled at a variable speed by the controller 34. By switching the rotation direction, the hydraulic oil can be selectively supplied to the downstream first hydraulic cylinder 22 or the downstream second hydraulic cylinder 40.

  That is, the downstream lifting device 68 has a pressure for returning the hydraulic oil to the second hydraulic pump 64 by the external force applied to the downstream first hydraulic cylinder 22 or the downstream second hydraulic cylinder 40, similarly to the upstream lifting device 58. The second hydraulic pump 64 is configured to be regenerated as power for assisting the rotation of the second hydraulic pump 64 that rotates in the direction in which the hydraulic oil is supplied to the downstream second hydraulic cylinder 40 or the downstream first hydraulic cylinder 22. Also in the downstream lifting device 68, the length of the downstream first pipe 62 reaching the downstream first hydraulic cylinder 22 and the downstream second pipe reaching the downstream second hydraulic cylinder 40 with respect to the second hydraulic pump 64. The lengths of the passages 66 are set to be the same, so that the pressure balance between the downstream first hydraulic cylinder 22 and the downstream second hydraulic cylinder 40 is favorably achieved.

  Height detecting means 72 for detecting the height positions of the connecting parts of the hydraulic cylinders 20, 22, 38, 40 in the elevating members 18, 36 are respectively disposed, and the detection signal from each height detecting means 72 is the above-mentioned. It is configured to be input to the controller 34 (see FIG. 4). Then, the controller 34 performs variable speed control of the corresponding electric motors 60 and 70 according to the height positions of the elevating members 18 and 36 detected by the height detecting means 72, thereby rotating the hydraulic pumps 54 and 64. The number of the hydraulic oils is variable, and the supply speed of the hydraulic oil from the hydraulic pumps 54 and 64 to the corresponding hydraulic cylinders 20, 22, 38 and 40 can be adjusted. That is, when the load applied to each hydraulic cylinder 20, 22, 38, 40 differs depending on the position where the steel material 10 transported by the first transport unit 14 or the second transport unit 16 is mounted on the movable beams 28, 46, etc. The piston rods 20a, 22a, 38a, 40a of the hydraulic cylinders 20, 22, 38, 40 are made the same by varying the rotational speed of the hydraulic pumps 54, 54, 64, 64 based on the detection signal of the height detecting means 72. By operating in synchronism with the speed, the movable beams 28 and 46 can be moved up and down in parallel without tilting the feed members 24 and 44. The height detecting means 72 can detect the height position of the elevating member by detecting the position of a detecting piece provided on the piston rod of the hydraulic cylinder, for example. You may detect the height position of an edge part.

  As the first and second hydraulic pumps 54 and 64, self-priming pumps are used. The leaked hydraulic oil is automatically replenished from the corresponding tank 74, and a constant amount of hydraulic oil is always provided in the closed circuit. It has come to store. Relief valves 76 are disposed in the pipelines 52, 56, 62, and 66 constituting the upstream and downstream lifting devices 58 and 68, respectively, so that the hydraulic cylinders 20, 22, 38, and 40 have a set value or more. When the above pressure is applied, the corresponding relief valve 76 allows the hydraulic oil to escape to a tank (not shown). Further, when the conveying device 12 is stopped for a long time, the relief valve 76 is opened so that the hydraulic oil in the hydraulic circuit of the lifting devices 58 and 68 can be drawn into the tank and the residual pressure can be released. It has become.

(Effects of Example)
Next, the operation of the transfer device 12 according to the above-described embodiment will be described. In each of the hydraulic pumps 54 and 64, hydraulic oil is supplied to the first hydraulic cylinders 20 and 22 when rotated in the forward direction, and hydraulic oil is supplied to the second hydraulic cylinders 38 and 40 when rotated in the reverse direction. Assume that it is set to supply.

  When the four electric motors 60, 60, 70, 70 are rotationally controlled by the controller 34 so as to rotate the four hydraulic pumps 54, 54, 64, 64 in the normal rotation direction, the hydraulic pumps 54 are driven. , 54, 64, 64 via the upstream first pipes 52, 52 and the downstream first pipes 62, 62, the corresponding four first hydraulic cylinders 20, 20, 22, in the first transport unit 14. When the hydraulic oil is supplied to 22, the piston rods 20 a, 22 a are urged in the extending direction, and the plurality of first movable beams 28 positioned at the lowered position are the first elevating members 18, 18 and the first feeding member. Ascending position through 24 (see FIG. 2). Further, the hydraulic pumps 54, 54, 64, 64 are rotated forward to supply the hydraulic oil in the hydraulic circuit of the lifting devices 58, 58, 68, 68 to the corresponding first hydraulic cylinders 20, 20, 22, 22. As a result, the hydraulic oil returns from the four second hydraulic cylinders 38, 38, 40, 40 of the second transport unit 16 to the corresponding hydraulic pumps 54, 54, 64, 64, and the second hydraulic cylinder 38. , 38, 40, 40 are contracted, so that the plurality of second movable beams 46 positioned at the ascending position in the second transport unit 16 become the second feed member 44 and the second elevating members 36, 36. At the same time, it descends to the lowered position. At this time, each of the four second hydraulic cylinders 38, 38, 40, 40 of the second transport unit 16 includes the second elevating members 36, 36, the second feed member 44, and the plurality of second movable beams 46. The load acts as an external force in a direction in which the piston rods 38a and 40a are contracted, and by the external force, the corresponding hydraulic pumps 54, 54, and 64 from the four second hydraulic cylinders 38, 38, 40, and 40, respectively. , 64 is regenerated to assist the power for rotating the hydraulic pumps 54, 54, 64, 64 in the forward rotation direction, and the load on each of the electric motors 60, 60, 70, 70 is reduced. Is done. In addition, when the steel material 10 is conveyed by the 2nd conveyance unit 16, the weight of this steel material 10 acts on each 2nd hydraulic cylinder 38,38,40,40 as an external force.

  At the timing when the first movable beam 28 reaches the raised position and the second movable beam 46 reaches the lowered position, the controller 34 controls the operation of the first electric cylinders 32, 32 and the second electric cylinders 48, 48. The first movable beam 28 moves forward on the first elevating members 18 and 18 together with the first feed member 24, and the second movable beam 46 moves backward on the second elevating members 36 and 36 together with the second feed member 44. Then, at the timing when the first movable beam 28 reaches the forward end and the second movable beam 46 reaches the backward end, the controller 34 rotates the four hydraulic pumps 54, 54, 64, 64 in the reverse direction. Thus, the four electric motors 60, 60, 70, 70 are rotationally controlled by the hydraulic pumps 54, 54, 64, 64 via the upstream second pipelines 56, 56 and the downstream second pipelines 66, 66. By supplying hydraulic fluid to the corresponding four second hydraulic cylinders 38, 38, 40, 40 in the second transport unit 16, the piston rods 38a, 40a are urged in the extending direction, and the retracted end The plurality of second movable beams 46 located at the lowered position rises to the raised position via the second elevating members 36 and 36 and the second feed member 44 (see FIG. 3). Further, the hydraulic pumps 54, 54, 64, 64 are reversed to supply the hydraulic oil in the hydraulic circuit of the lifting devices 58, 58, 68, 68 to the corresponding second hydraulic cylinders 38, 38, 40, 40. Thus, the hydraulic oil returns from the four first hydraulic cylinders 20, 20, 22, 22 of the first transport unit 14 to the corresponding hydraulic pumps 54, 54, 64, 64, and the first hydraulic cylinders 20, 20 , 22, 22, the plurality of first movable beams 28 positioned at the ascending position at the forward end in the first transport unit 14 are contracted by the first feed member 24 and the first elevating member 18, 18 is lowered to the lowered position. At this time, the four first hydraulic cylinders 20, 20, 22, 22 of the first transport unit 14 have the first elevating members 18, 18, the first feed member 24, and the plurality of first movable beams 28. The load acts as an external force in the direction in which the piston rods 20a and 22a are contracted, and the external hydraulic pumps 54, 54, and 64 corresponding from the four first hydraulic cylinders 20, 20, 22, and 22 by the external force. , 64 is regenerated to assist the power for rotating the hydraulic pumps 54, 54, 64, 64 in the reverse direction, reducing the load on the electric motors 60, 60, 70, 70. The In addition, when the steel material 10 is conveyed by the 1st conveyance unit 14, the weight of this steel material 10 acts on each 1st hydraulic cylinder 20,20,22,22 as external force.

  The controller 34 controls the operation of the first electric cylinders 32 and 32 and the second electric cylinders 48 and 48 at the timing when the first movable beam 28 reaches the lowered position and the second movable beam 46 reaches the raised position. Thus, the first movable beam 28 moves back on the first elevating members 18 and 18 together with the first feed member 24, and the second movable beam 46 moves forward on the second elevating members 36 and 36 together with the second feed member 44. To do.

  As described above, the rotation directions of the first hydraulic pumps 54 and 54 and the second hydraulic pumps 64 and 64 are switched at a predetermined timing, and the first electric cylinders 32 and 32 and the second electric cylinders 48 and 48 are operated at a predetermined timing. As a result, a series of ascending-advancing-descending-retreating operations are given to the first movable beam 28 in the first transport unit 14, and descending-retreating to the second movable beam 46 in the second transport unit 16. -A sequence of ascending and advancing movements is given. And in the 1st conveyance unit 14 and the 2nd conveyance unit 16, the steel material 10 currently supported by the recessed parts 30a and 50a of the fixed beams 30 and 50 corresponding at the time of raising of the movable beams 28 and 46 is made into a recessed part in the movable beams 28 and 46. The steel material 10 is received so as to be supported by 28a, 46a, descends after moving forward in the ascending position, and is delivered so as to support the steel material 10 in the recesses 30a, 50a on the downstream side of the corresponding fixed beams 30, 50, whereby the steel material 10 is transferred. The movable beams 28 and 46 are conveyed by one advance.

  Here, for example, when the weight of the steel material 10 to be lifted by the first movable beam 28 of the first transport unit 14 is heavier than the weight of the steel material 10 supported by the second movable beam 46 in the second transport unit 16. Then, the external force applied to the second hydraulic cylinders 38 and 40 becomes smaller than the load to be lifted by the first hydraulic cylinders 20 and 22. On the other hand, when the weight of the steel material 10 to be lifted by the first movable beam 28 of the first transport unit 14 is lighter than the weight of the steel material 10 supported by the second movable beam 46 in the second transport unit 16, etc. Then, the external force applied to the second hydraulic cylinders 38 and 40 becomes larger than the load to be lifted by the first hydraulic cylinders 20 and 22. Thus, when the magnitude | size of the external force added to the 1st hydraulic cylinders 20 and 22 and the 2nd hydraulic cylinders 38 and 40 is different, each hydraulic pump 54 corresponding from each hydraulic cylinder 20, 22, 38, 40 is different. , 54, 64, 64 may change the moving speed of the first movable beam 28 and the second movable beam 46 due to a difference in pressure for returning the hydraulic oil to the hydraulic fluid. Therefore, in the embodiment, the controller 34 shift-controls the electric motors 60 and 70 based on the detection signals from the height detection means 72, thereby corresponding hydraulic cylinders 20, 22, 38, and 40. The hydraulic oil is supplied at an appropriate speed, and the first movable beam 28 and the second movable beam 46 can be moved at a necessary constant speed. Further, since each height detecting means 72 detects the height of the connecting portion of each hydraulic cylinder 20, 22, 38, 40 in the elevating members 18, 36, the detection signal of each height detecting means 72 is used. Based on this, the rotational speeds of the hydraulic pumps 54, 54, 64, 64 are varied to operate the piston rods 20a, 22a, 38a, 40a of the hydraulic cylinders 20, 22, 38, 40 synchronously at the same speed. The movable beams 28 and 46 can be moved up and down in parallel without tilting the feed members 24 and 44.

  In the transfer device 12 of the embodiment, the lifting and lowering devices 58 and 68 that move up and down the first movable beam 28 of the first transfer unit 14 and the second movable beam 46 of the second transfer unit 16 are provided as hydraulic cylinders 20, 22, and 38. 48 and hydraulic pumps 54 and 64, the construction of the lifting devices 58 and 68 for moving the movable beams 28 and 46 up and down can be simplified, reducing the number of parts and keeping the manufacturing cost low. be able to. In addition, maintainability is improved by reducing the number of parts. Further, by simplifying the configuration of the lifting devices 58 and 68, the weight can be reduced, and the foundation work cost can be reduced. Furthermore, the height of the hydraulic cylinders 20, 22, 38, 40 for moving the movable beams 28, 46 up and down is short, so that the pits to be constructed when installing the conveying device 12 can be made shallow. It can reduce the cost. In the embodiment, since the piston rods 20a, 22a, 38a, 40a of the hydraulic cylinders 20, 22, 38, 40 are directly connected to the lifting members 18, 36, the hydraulic cylinders 20, 22, 38, 40 and the lifting members There is no need to provide a connecting mechanism between the elevators 18 and 36, and the lifting devices 58 and 68 can be simplified and miniaturized.

  The hydraulic paths 52, 56, 62, 66 connecting the first hydraulic cylinders 20, 22 of the first transport unit 14 and the second hydraulic cylinders 38, 40 of the second transport unit 16 are configured to be closed circuits. The operation of the first movable beam 28 of the first transport unit 14 and the operation of the second movable beam 46 of the second transport unit 16 can be easily synchronized. Moreover, in the elevating devices 58 and 68, the lengths of the pipe lines 52 and 56 or the pipe lines 62 and 66 connecting the two hydraulic cylinders 20 and 38 or the hydraulic cylinders 22 and 40 connected to the hydraulic pumps 54 and 64 are set. Since they are the same, the pressure loss in the pipe line is also equal, and the operations of the first movable beam 28 and the second movable beam 46 can be synchronized with high accuracy. Further, when one of the movable beams 28, 46 is raised, the hydraulic pumps 54, 64 are rotated by pressure generated by an external force applied to the hydraulic cylinders 20, 22, 38, 40 for moving the other movable beams 46, 28 up and down. Since the power can be regenerated to assist the power to be generated, the load on the electric motors 60 and 70 can be reduced to extend the service life and the running cost can be reduced.

  Here, the hydraulic oil stored in the tank by rotating the hydraulic pump with the electric motor is supplied to the hydraulic cylinder via the hydraulic pump, and the surplus hydraulic oil is returned to the tank. Even when the transport device in a state in which the cylinder is not placed is paused for a short time, the electric motor must continue to rotate in order to maintain the hydraulic cylinder in the pressure-holding state, which increases power consumption during the pause period. There are difficulties.

  On the other hand, in the transfer device 12 of the embodiment, the first hydraulic cylinders 20 and 22 of the first transfer unit 14 and the second hydraulic cylinders 38 and 40 of the second transfer unit 16 are connected by common hydraulic pumps 54 and 64. Each of them is configured to be a closed circuit. Therefore, when the conveying device 12 is stopped for a short time, even if the electric motors 60 and 70 are stopped, the first hydraulic cylinders 20 and 22 and the second hydraulic cylinders 38 and 40 are balanced so that the pressure holding state is maintained. It is maintained and the amount of power consumption during the suspension period can be eliminated.

(Example of change)
The present invention is not limited to the configuration of the examples, and various embodiments can be adopted within the scope of the gist of the present invention. For example, the following modifications can be made.
(1) In the embodiment, the upstream or downstream hydraulic cylinders in the first transfer unit and the second transfer unit are connected to a common hydraulic pump, but the upstream hydraulic cylinder and the second transfer cylinder in the first transfer unit are connected to the common hydraulic pump. A configuration in which the hydraulic cylinder on the downstream side of the transfer unit is connected to a common hydraulic pump, and the hydraulic cylinder on the downstream side of the first transfer unit and the hydraulic cylinder on the upstream side of the second transfer unit are connected to a common hydraulic pump. It is good.
(2) In the embodiment, in each transport unit, two lifting members connected to two hydraulic cylinders are arranged apart from each other in the lateral direction, and the movable beam is moved up and down by the two lifting members. A configuration in which the movable beam is moved up and down by one elevating member or three or more elevating members according to the length dimension of the steel material to be conveyed can be adopted. When three or more elevating members are provided, the hydraulic cylinders connected to the corresponding elevating members arranged in the conveying direction in the upstream conveying unit and the downstream conveying unit are connected to each other. Configure to connect to a common hydraulic pump.
(3) In the embodiment, the case where two hydraulic cylinders are connected to the elevating member has been described. However, the number of hydraulic cylinders connected to the elevating member may be one or three or more, and upstream conveyance The lifting device may be configured by connecting the hydraulic cylinder of the unit and the corresponding hydraulic cylinder of the downstream transport unit to a common hydraulic pump.
(4) In the embodiment, the case where separate fixed beams are provided in the first transport unit and the second transport unit has been described. However, a fixed beam that is common to both transport units can be used.
(5) In the embodiment, the electric cylinder is used as the means for moving the movable beam forward and backward along the transport direction. However, various conventionally known means can be used as the forward and backward means.

DESCRIPTION OF SYMBOLS 10 Steel, 20 1st hydraulic cylinder upstream, 22 1st hydraulic cylinder downstream 28 1st movable beam, 30 1st fixed beam, 32 1st electric cylinder (advance / retreat means)
38 Second hydraulic cylinder, 40 Second hydraulic cylinder, 46 Second movable beam 48 Second electric cylinder (advance / retreat means), 50 Second fixed beam 52 First upstream pipe (hydraulic path), 54 First hydraulic pump 56 upstream second pipe (hydraulic path), 58 upstream lifting device, 60 first electric motor 62 downstream first pipe (hydraulic path), 64 second hydraulic pump 66 downstream second pipe (hydraulic path), 68 Downstream lifting device, 70 Second electric motor

Claims (3)

A fixed beam (30, 50) capable of supporting the steel material (10), and disposed in parallel with the fixed beam (30, 50) and displaced forward and backward in the conveying direction of the steel material (10). ) Two movable beams (28, 46) capable of supporting the movable beam (28, 46), a lifting device (58, 68) for moving the movable beam (28, 46) up and down, and the movable beam (28, 46) as a steel material (10). Advancing / retreating means (32, 48) moving forward and backward in the transport direction of the movable beam (28, 46) by operating the movable beam (28, 46) by the lifting device (58, 68) and the advance / retreat means (32, 48) 28, 46) and walking beam type conveying device that conveys the steel material (10) alternately with the fixed beam (30, 50),
The lifting device (58, 68)
Single-acting first hydraulic cylinder (20, 22) connected to the first movable beam (28) on the upstream side in the conveying direction and single-acting type connected to the second movable beam (46) on the downstream side in the conveying direction. The second hydraulic cylinder (38, 40) is connected to the first hydraulic cylinder (20, 22) and the second hydraulic cylinder (38, 40), and is driven forward / reversely by the electric motor (60, 70). And a hydraulic path (52, 56, 62, 66) of the lifting device (58, 68) is configured to form a closed circuit,
A steel material conveying apparatus, wherein the first movable beam (28) and the second movable beam (46) are alternately moved up and down by forward and reverse rotation of the hydraulic pump (54, 64).   The length of each hydraulic path (52, 56, 62, 66) reaching two hydraulic cylinders (20, 22, 38, 40) with the hydraulic pump (54, 64) as a reference is the same. Steel material transport device. A plurality of the lifting devices (58, 68) are provided, and the first hydraulic cylinders (20, 22) and the second hydraulic cylinders (38, 40) of the plurality of lifting devices (58, 68) correspond to the corresponding first movable beam. (28) and the second movable beam (46) are connected to positions separated from each other,
The electric motors (60, 60) of each of the lifting devices (58, 68) so that the hydraulic cylinders (20, 22, 38, 40) connected to the same movable beam (28, 46) operate synchronously at the same speed. The steel material conveying device according to claim 1 or 2, wherein the rotational speed of the hydraulic pump (54, 64) can be varied by controlling the driving of 70).

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