JP2007147338A - Weighing device, weighing system and weighing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a conveyance time by shortening a weighing time of a conveyance object when the conveyance object is conveyed from a conveyance target to a conveyance source, and to thereby reduce a temperature change and quality deterioration of the conveyance object. <P>SOLUTION: Weighing rails 41, 42 are arranged in succession with rails 11, 12 installed obliquely. Stoppers 33, 34 for stopping a truck 30 on a prescribed position are arranged on the rails 11, 12. After the truck 30 is stopped on the prescribed position by the stoppers 33, 34, a wire 36 is wound down to loosen a tension applied to the wire 36, and the mass of the truck 30 is weighed in this state. Hereby, the mass of the truck 30 can be weighed accurately even when the truck 30 is in the oblique state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a weighing device, a weighing system, and a weighing method for weighing the mass of a carriage that conveys a loaded conveyance object from a low position to a high position on an inclined surface.

  2. Description of the Related Art Conventionally, for example, a technology for transporting a transported object from a low position to a high position on an inclined surface by loading a transport object on a cart such as a skip conveyor and winding a wire rope connected to the cart with a winch is known. . A method of weighing the mass of the conveyed product loaded on the carriage when conveying the conveyed product in this way is also known.

  Patent Document 1 discloses a method of weighing the transported material using a measuring hopper before the transported product such as an asphalt mixture is loaded on the carriage.

JP 60-112903 A

  However, the weighing method described in Patent Document 1 has a problem that it takes time to weigh the conveyed product, and as a result, the conveyance time from the conveyance source to the conveyance destination becomes long. For example, when the high-temperature reduced iron obtained by heating and reducing the iron oxide-containing iron raw material in a rotary hearth furnace is transported from the rotary hearth furnace to the melting furnace, the result of the above Patent Document 1 is used. As a result, the transport time from the transport source to the transport destination becomes longer, which results in deterioration in quality such as a decrease in temperature and oxidation of the high temperature reduced iron.

  The present invention has been made in view of the above problems, and shortens the transport time when transporting a transport object from a transport source to a transport destination using a carriage that travels from a low position to a high position on an inclined surface. The purpose is to reduce the temperature change and quality degradation of the product.

  In order to solve the above-described problems, according to the present invention, a cart that can travel on an inclined rail by winding a wire with a winch and conveys a loaded article from a low position to a high position. A weighing device for weighing a mass, wherein the weighing rail is disposed in an inclined state following a lower end of the inclined rail; and a stopper for stopping the carriage at a predetermined position on the weighing rail; A weighing device is provided, comprising a weighing device for weighing the carriage stopped at the predetermined position together with the weighing rail.

  According to the present invention, since the mass of the carriage before and after the loading of the conveyed product can be weighed as it is on the weighing rail arranged inclined after the inclined installation rail, It is not necessary to move the cart to the horizontal position and stop it, and as a result, the total time required for weighing the cart can be shortened.

  In the weighing apparatus, the conveyed product may be an iron oxide-containing iron raw material discharged from a rotary hearth furnace.

  According to the present invention, a plurality of the weighing devices are juxtaposed, and any of the carriages stopped at a predetermined position on each weighing rail in each weighing device is supplied from the supply source of the conveyed product. There is provided a weighing system further comprising a switching supply mechanism capable of switching and supplying an object.

  Furthermore, according to the present invention, a weighing method is provided for weighing the mass of a carriage that can run on a tilted rail by winding a wire with a winch and that conveys a loaded conveyed object from a low position to a high position. A step of lowering the empty carriage along the rail, a step of stopping the empty carriage in a tilted position at a predetermined position in the low position, and a connection to the empty carriage thereafter. The process of loosening the tension of the wire, the process of weighing the empty carriage that is tilted and stopped, the process of loading the transported goods on the empty carriage, and the loading are completed. A weighing method comprising weighing the mass of the carriage.

  According to the present invention, after a cart traveling on an inclined rail stops at a predetermined position on the weighing device, the wire connected to the cart is loosened, and then the mass of the cart is weighed. Since it did in this way, the mass of the cart of the type which drive | works with the winding of a wire can be measured accurately. In addition, since the mass of the cart before and after loading of the conveyed product is weighed in an inclined state, the total time required for weighing the cart is shortened.

  In the weighing method, the conveyed product may be an iron oxide-containing iron raw material discharged from a rotary hearth furnace.

  Further, in the weighing method, a plurality of the rails are installed to form a plurality of transport systems, and a plurality of the predetermined positions are set corresponding to the respective transport systems. In addition, when the process of measuring the mass of one carriage stopped at one predetermined position where loading of the transported object is completed is completed, another empty state is set at another predetermined position. You may make it complete | finish weighing of the mass of a trolley | bogie.

  According to the present invention, in a plurality of transport systems, when the weighing of the mass of one truck stopped at one predetermined position where the loading of the transported objects is completed, an empty carriage in another transport system is completed. Since the weighing of one of the transport systems is completed, the transported goods are loaded on the carriage of one transport system, and after weighing the mass, the transported goods are immediately transferred to the empty carriage of the other transport system. Loading can be started, and efficient operation can be realized when multiple transport systems are used.

  According to the present invention, the weighing time when transporting the transported object from the transport source to the transport destination is shortened compared to the conventional case. Thereby, since the conveyance time as a whole is shortened, the temperature change and quality deterioration of a conveyed product can be reduced. Also, the conveyance efficiency is improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a configuration diagram of a reduced iron charging line 1 to which a weighing device 2 and a weighing system 3 according to the present embodiment are applied. As shown in FIG. 1, in the reduced iron charging line 1, the weighing system 3 is a rail that forms one transport system 10 between a rotary hearth furnace 4 as a transport source and a melting furnace 5 as a transport destination. 11 and 12 and rails 21 and 22 forming another transport system 20 are juxtaposed. As shown in FIG. 2, two rails 11 are arranged in parallel, and two rails 12 are also arranged in parallel. For convenience of illustration, FIG. Except for each figure, it looks as seen from the side. Further, on the side higher than P in the drawing, as shown in FIG. 2, the rail 11 and the rail 12 are combined to constitute one rail 13. On the lower side than P, the rail 13 branches vertically into the rail 11 and the rail 12. The same applies to the other transport systems 20, and the rail 21 and the rail 22 are combined to form one rail 23 on the side higher than P, and the rail 21 and the rail 22 are connected on the side lower than P. Branches up and down.

  The rails 11, 12 and 21, 22 are installed inclined from the rotary hearth furnace 4 to above the melting furnace 5. The lower ends 11 a and 12 a of the rails 11 and 12 branched up and down and the lower ends 21 a and 22 a of the rails 21 and 22 continue to the weighing device 2 at a low position L below the rotary hearth furnace 4. On the other hand, the upper end portions of the rails 11 and 12 and the rails 21 and 22 become the rails 13 and 23, respectively, and are located at a high position H above the melting furnace 5, and are not shown in the figure, but again at the predetermined positions Branches in two stages. A carriage 30 is disposed on the rails 11 and 12 so as to be able to travel, and a carriage 40 is disposed on the rails 21 and 22 so as to be capable of traveling. The carts 30 and 40 travel on the rails 11, 12, 22, and 22, respectively, and convey the high-temperature reduced iron M as the conveyed product discharged from the rotary hearth furnace 4 from the low position L to the high position H. Can do.

  The rotary hearth furnace 4 can heat and reduce an iron oxide-containing iron raw material containing iron oxide and hot-form it into briquetted high-temperature reduced iron M. Moreover, the melting furnace 5 can melt the hot-formed briquette high-temperature reduced iron M using carbon fuel blown from the bottom.

  FIG. 3 is an enlarged view of the vicinity of the rotary hearth furnace 4 of the reduced iron charging line 1. In the rotary hearth furnace 4 as a supply source of the high-temperature reduced iron M, the high-temperature reduced iron M supplied from the rotary hearth furnace 4 is supplied to the carriages 30 and 40 of each conveyance system stopped at a predetermined position of the low position L. A switching damper 6 that can be switched in from above is provided.

  The switching damper 6 as the switching supply mechanism can be switched to either a position X indicated by a broken line in FIG. 3 or a position Y indicated by a solid line in FIG. The switching damper 6 switched to the position X indicated by the broken line in FIG. 3 is directed to a carriage 30 stopped at a predetermined position on weighing rails 41 and 42 described later following the rails 11 and 12, respectively. The high-temperature reduced iron M discharged from the furnace 4 can be supplied to the cart 30. Further, the switching damper 6 switched to the position Y shown by the solid line in FIG. 3 supplies the high-temperature reduced iron M to the carriage 40 stopped at a predetermined position on the later-described weighing rails 51 and 52 following the rails 21 and 22. it can.

  The rails 11 and 12 and the carriage 30 forming one transport system 10 are configured in the same manner as the rails 21 and 22 and the carriage 40 forming the other transport system 20 and function in the same manner. Description will be made based on the transport system 10 and its weighing device 2. FIG. 4 shows a side surface of the weighing device 2 according to the present embodiment. In FIG. 4, the weighing device 2 is inclined on the weighing rails 41 and 42 of the weighing device 2 following the lower ends 11 a and 12 a of the rails 11 and 12. In this state, the cart 30 is stopped at a predetermined position.

  As shown in FIG. 4, the weighing device 2 includes a weighing rail 41 on which the front wheel 31 of the carriage 30 travels and a weighing rail 42 on which the rear wheel 32 of the carriage 30 travels in two upper and lower stages. The rails 41 and 42 are supported by a support body 43. The support body 43 is supported by a weigher 45 provided on the upper portion of the base 44. Thereby, the weighing device 45 can weigh the mass of the carriage 30 that stops at a predetermined position on the weighing rails 41 and 42 together with the weighing rails 41 and 42.

  As described above, the weighing rails 41 and 42 are arranged in two upper and lower stages. In the upper stage, the weighing rail 41 is disposed in an inclined manner following the lower end portion 11 a of the rail 11. In the lower stage, the weighing rails 42 are respectively inclined and arranged following the lower end portion 12 a of the rail 12. The gap 60 between the lower end portion 11a of the rail 11 and the weighing rail 41 is set so small that the carriage 30 can travel through the gap 60 without any problem. Similarly, the gap 61 between the lower end portion 12a of the rail 12 and the weighing rail 42 is set small enough to allow the carriage 30 to travel through the gap 61 without any problem.

  On the upper surface of the weighing rail 41, there is provided a stopper 33 that comes into contact with the front wheel 31 of the carriage 30 descending from the high position H side and stops the carriage 30 at a predetermined position shown in FIG. Similarly, a stopper 34 that contacts the rear wheel 32 of the carriage 30 descending from the high position H side and stops the carriage 30 at a predetermined position shown in FIG. The carriage 30 stopped by the stoppers 33 and 34 can be kept stationary at that position.

  In this embodiment, the carriage 30 is connected to one end of the wire 36 via the wire connecting portion 35. The other end of the wire 36 is connected to a winch 70 provided at the high position H. The winch 70 can wind the wire 36 and travel from the low position L to the high position H along the carriage 30 and the rails 11 and 12. The winch 70 can lower the carriage 30 from the high position H to the low position L along the rails 11 and 12 by rewinding the wire 36. In the present embodiment, a wire connecting portion 35 is rotatably connected to a horizontal horizontal shaft 37 provided on the lower end side of the carriage 30. As a result, the wire connecting portion 35 is rotated about the horizontal axis 37, and the carriage 30 is kept running at a constant angle even when the inclination angles of the rails 11 and 12 are changed. Is possible.

  FIG. 5 is an AA arrow view of FIG. 4, and the front wheel 31 is in contact with and supported by the rail 11 and the weighing rail 41 at the outer portion 31 a, and the rail 11 and the weighing rail 41 having a large width between the rails. Can be driven. The rear wheel 32 is in contact with and supported by the rail 12 and the weighing rail 42 at the inner portion 32a, and can run on the rail 12 and the weighing rail 42 with a small width between the rails.

  The weighing method of the present invention will be described with reference to FIGS. 6 to 10 using the weighing device 2 configured as described above. FIGS. 6 to 10 show that the high-temperature reduced iron M discharged from the rotary hearth furnace 4 as the transfer source is moved from the low position L to the high position H by the carriages 30 and 40 forming the two transfer systems 10 and 20. It shows a series of steps when being transported and then put into the melting furnace 5 which is the final transport destination.

As shown in FIG. 6, the wire 36 is wound down by the winch 70, and the empty carriage 30 connected to the wire 36 is lowered along the rails 11 and 12 by its own weight, and from a high position H above the melting furnace 5. Drive at high speed V ₁ toward the low position L. When the empty carriage 30 approaches the low position L, the lowering speed of the wire 36 by the winch 70 is controlled, and the traveling speed of the empty carriage 30 is reduced to the speed V ₂ (V ₁ > V ₂ ).

  Next, as shown in FIG. 7, the decelerated empty carriage 30 passes through the gaps 60, 61 at a low position L below the rotary hearth furnace 4, and passes from the rails 11, 12 to the weighing rails 41, 42. To reach. The empty carriage 30 is stopped at a predetermined position on the weighing device 2 with the front wheel 31 and the rear wheel 32 abutting against the stoppers 33 and 34, respectively. The stopped empty cart 30 has a front wheel 31 positioned on the weighing rail 41 and a rear wheel 32 positioned on the weighing rail 42 and is inclined as shown in FIGS. In addition, as shown in FIG. 7, the wire guide roller 38 which guides the direction of the wire 36 may be provided so that the wire 36 may be appropriately arranged along the inclination.

As shown in FIG. 8, the wire 36 is further wound by the winch 70 even after the empty carriage 30 stops. As the wire 36 is lowered, the dead weight of the empty carriage 30 that has been applied to the wire 36 during traveling and immediately after stopping is applied to the stoppers 33 and 34. That is, the tension of the wire 36 connected to the carriage 30 is relaxed. Finally, the wire 36 is wound down by, for example, about 100 mm. As a result, all the dead weights of the empty carriage 30 are supported by the stoppers 33 and 34 and the weighing device 2 via the weighing rails 41 and 42. Thus, the mass of the empty carriage 30 is weighed together with the weighing rails 41 and 42, for example, W ₁ by the weighing device 45 of the weighing device 2 without being affected by the tension of the wire 36. The weigher 45 continues to measure the mass of the carriage 30 for a predetermined time Δt seconds until after the switching damper 6 described later is switched.

After the mass of the empty carriage 30 is weighed, the carriage of the transport system 20 stopped on the weighing rails 41 and 42 of the other weighing devices 2 at the same low position L at the position Y shown by the solid line in FIG. The switching damper 6 facing toward 40 is switched to the position X indicated by the broken line in FIG. 8 and faces toward the empty carriage 30 that stops on the weighing device 2 following the rails 11 and 12. Before the switching damper 6 is switched to the carriage 30 (X), the loading of the high-temperature reduced iron M introduced through the switching damper 6 onto the carriage 40 has been completed. weight of the weighing state of the bogie 30 is terminated as W _1. In addition, the carriage 40 that has been loaded departs toward the high position H by winding up the winch 70.

Next, as shown in FIG. 9, the high-temperature reduced iron M discharged from the rotary hearth furnace 4 is introduced into the empty carriage 30 via the switching damper 6 and loaded. While the high-temperature reduced iron M is loaded on the carriage 30, the mass of the carriage 30 is continuously measured by the weighing unit 45. When the cart 30 is fully loaded with the high-temperature reduced iron M, the loading operation of the high-temperature reduced iron M by the switching damper 6 ends. Then, the weighers 45, the mass of the carriage 30 in a state where high-temperature reduced iron M is packed is weighed each weighing rails 41 and 42, for example, _{W 2.} In the present embodiment, the predetermined time Δt is set in advance so that the time after starting the weighing reaches Δt seconds after weighing the mass of the carriage 30 in a state where the high-temperature reduced iron M is fully loaded. Accordingly, the weigher 45 finishes weighing the mass of the carriage 30 when the time Δt seconds elapses.

  As shown in FIG. 10, after the weighing of the mass of the carriage 30 on which the high-temperature reduced iron M has been loaded is finished, the switching damper 6 facing the carriage 30 at the position X indicated by the broken line in FIG. It is switched to the position Y shown by the solid line in FIG. 10 and faces the carriage 40 of the transport system 20 that stops on the weighing rails 41 and 42 of the other weighing devices 2 at the same low position L. In FIG. 7, the carriage 40 has been loaded and transported the high-temperature reduced iron M to the melting furnace 5 and returned to an empty state again.

When the weighing of the cart 30 loaded with the high-temperature reduced iron M is completed, the wire 36 is wound up by the winch 70, and the cart 30 loaded with the high-temperature reduced iron M is moved from the weighing device 2 at the low position L to the high position H. It goes up along the rails 11 and 12 toward. Then, as shown in FIG. 1, the cart 30 that has reached the high position H above the melting furnace 5 puts the loaded high-temperature reduced iron M into the melting furnace 5 from above the melting furnace 5. At this input timing, the weighing value W ₁ of the carriage 30 measured in the empty state and the weighing value W ₂ of the carriage 30 measured in a state where the high-temperature reduced iron M is fully loaded are input to a computer (not shown). . At this time, the mass of the high-temperature reduced iron M that has been transported and put into the melting furnace 5 is calculated as W ₂ −W ₁ .

  Similarly, the high-temperature reduced iron M discharged from the rotary hearth furnace 4 is alternately supplied to the cart 30 of one transport system 10 and the cart 40 of the other transport system 20, and the cart 30 of each transport system. , 40, the process of alternately transferring from the low position L to the high position H in sequence and putting the high-temperature reduced iron M into the melting furnace 5 is repeated. In one transport system 10, an empty carriage 30 travels on the rails 11 and 12, reaches the low position L from the high position H, and has a mass at a predetermined position on the weighing rails 41 and 42 of the weighing device 2. In the other transport system 20, the high-temperature reduced iron supplied from the rotary hearth furnace 2 to the empty carriage 40 that stops at a predetermined position on the weighing rails 41 and 42 of the other weighing device 2 is measured. M is loaded via the switching damper 6. Then, before the carriage 40 of the transport system 20 is fully loaded and the switching damper 6 is switched, each transport system 10, Transport at 20 and weighing of the carriage is performed.

According to the above-described embodiment, the mass W ₁ of the empty cart 30 and the mass W ₂ of the cart 30 loaded with the high-temperature reduced iron M from the empty state are measured on the weighing rails 41 and 42. Since the weighing rails 41 and 42 are weighed together in a state of being tilted and stopped at a predetermined position and the mass W ₂ -W ₁ of the high-temperature reduced iron M to be transferred is calculated, Time spent on weighing is reduced. Therefore, the transport time of the high-temperature reduced iron M from the rotary hearth furnace 4 to the melting furnace 5 including the weighing time is shortened compared to the conventional case. Thereby, the temperature change and quality degradation of the high temperature reduced iron M can be reduced more than before. Moreover, the mass of the high temperature reduced iron M conveyed is measured more accurately than before.

  Further, at the time when the mass of the cart 30 in a state where the high-temperature reduced iron M is fully loaded in one transport system 10 is weighed, the weighing of the mass of the empty cart 40 in the other transport system 20 is finished. Therefore, immediately after the carriage 30 of one transfer system 10 is fully loaded with the high-temperature reduced iron M and its mass is weighed, the switching damper 6 that supplies the high-temperature reduced iron M is replaced with an empty carriage 40 of the other transfer system 20. It is possible to immediately start loading the high-temperature reduced iron M onto the empty cart 40. Thereby, the useless waiting time of the carriages 30 and 40 of each transport system is eliminated, and efficient operation of a plurality of transport systems is realized.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  In the embodiment described above, the case where the conveyed product is the high-temperature reduced iron M has been described. However, the conveyed product may be a conveyed product other than the high-temperature reduced iron M.

  In the above-described embodiment, the case where the transportation source is the rotary hearth furnace 4 has been described, but the transportation source may be other equipment or the like. Moreover, although the case where a conveyance destination is the melting furnace 5 was demonstrated, a conveyance destination may be another installation.

  In the above-described embodiment, the weighing system 3 includes the transport system 10 formed by the rails 11 and 12 and the carriage 30 and the transport system 20 formed by the rails 21 and 22 and the carriage 40 and the like. However, the weighing system 3 may be composed of three or more transport systems.

  The present invention is useful, for example, for a reduced iron charging line that conveys iron oxide-containing iron material discharged from a rotary hearth furnace to a melting furnace.

FIG. 1 is a configuration diagram of a reduced iron charging line to which the weighing device and the weighing system according to the present embodiment are applied. FIG. 2 is a cross-sectional view illustrating the configuration of rails that form a transport system. It is the figure which expanded the rotary hearth vicinity vicinity of a reduced iron charging line. It is a figure explaining the weighing apparatus which concerns on this Embodiment. FIG. 5 is a view taken along the line A-A in FIG. 4 and is a view for explaining a structure of a front wheel and a rear wheel of the carriage. It is explanatory drawing which shows the state which the trolley | bogie is falling in the weighing method which concerns on this Embodiment. It is explanatory drawing which shows the state which has stopped the trolley | bogie in the predetermined position in the weighing method which concerns on this Embodiment. It is explanatory drawing which shows the state which loosened the wire connected to the trolley | bogie in the weighing method which concerns on this Embodiment. It is explanatory drawing which shows the state which has loaded the high temperature reduced material in the weighing method which concerns on this Embodiment. It is explanatory drawing which shows the state which the trolley | bogie with which loading completed in the weighing method which concerns on this Embodiment is rising.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reduced iron charging line 2 Weighing device 3 Weighing system 4 Rotary hearth furnace 5 Melting furnace 6 Switching damper 10, 20 Transport system 11, 12, 21, 22, Rail 11a, 12a, 21a, 22a Lower end part 11b, 12b of rail , 21b, 22b Rail upper end 30, 40 Dolly 31 Dolly front wheel 31a Front wheel outer portion 32 Dolly rear wheel 32b Rear wheel inner portion 33, 34 Stopper 35 Wire connecting portion 36 Wire 37 Horizontal shaft 38 Wire guide roller 41 , 42 weighing rail 43 base plate support 44 45 weighing 60, 61 gap 70 winch L low position H high position M high-temperature reduced iron V _{1, V 2} carriage travel speed X, Y switching damper position

Claims (6)

A weighing device that weighs the mass of a carriage that can run on a tilted rail by winding a wire with a winch and that conveys a loaded object from a low position to a high position,
A weighing rail disposed in an inclined state following the lower end of the inclined rail; and
A stopper for stopping the carriage at a predetermined position on the weighing rail;
A weighing apparatus comprising: a weighing device for weighing the carriage stopped at the predetermined position together with the weighing rail. The weighing apparatus according to claim 1, wherein the conveyed product is an iron oxide-containing iron raw material discharged from a rotary hearth furnace. A plurality of weighing devices according to claim 1 or 2 are juxtaposed,
It further has a switching supply mechanism capable of switching and supplying the transported material from the transported material supply source to any carriage stopped at a predetermined position on each weighing rail in each weighing device. Yes, weighing system. A weighing method for weighing the mass of a carriage capable of traveling on a tilted rail by winding a wire with a winch and conveying a loaded object from a low position to a high position,
Lowering the empty carriage along the rail;
Stopping the empty carriage in a tilted state at a predetermined position in the low position;
Then releasing the tension of the wire connected to the empty carriage;
A step of weighing a mass of the empty carriage which is then tilted and stopped;
Then loading the transported goods onto the empty carriage;
A step of weighing the mass of the loaded carriage,
A weighing method characterized by comprising: The weighing method according to claim 4, wherein the conveyed product is an iron oxide-containing iron raw material discharged from a rotary hearth furnace. A plurality of rails are installed to form a plurality of transport systems, and a plurality of the predetermined positions are set corresponding to each transport system,
The transported object can be supplied to any cart that is stopped at a predetermined position.
When the process of weighing the mass of one carriage stopped at one predetermined position where loading of the transported object is completed, the weighing of the mass of another carriage that is empty at another predetermined position is completed. The weighing method according to claim 4 or 5, characterized in that

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