CN104507837A - Unloader - Google Patents

Abstract

The present invention provides an unloader. The unloader is provided with: a bucket elevator (9) for unloading bulk material (M); a boom conveyor (39) for conveying the bulk material (M) unloaded by the bucket elevator (9); a drop section (60) for dropping the bulk material (M) conveyed by the boom conveyor (39); a blade wheel (65) which convert the drop energy of the bulk material (M) into electrical energy; a speed increasing gear (66), and an electric power generator (67). Thus, the potential energy of the bulk material (M), which the bulk material (M) has when the bulk material (M) is unloaded, is converted into electrical energy when the bulk material (M) is dropped, and the obtained electrical energy can be utilized.

Description

Unloader

technical field

The present invention relates to an unloader for unloading objects.

Background technique

Conventionally, the unloader of the following patent document 1 is known as the technique of this field. The unloader is equipped with a grab bucket for lifting bulk objects, and a traverse device for receiving bulk objects in the grab bucket and transporting them to a hopper. In this unloader, power consumption can be reduced by using the regenerative power generated when the grab is lowered as part of the moving power of the traverse device.

Previous technical literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2011-213461

Contents of the invention

The technical problem to be solved by the invention

However, in the above-mentioned unloader, the bulk material lifted by the grab bucket is only dropped from the traverse device. Therefore, there is still room for improvement in effective utilization of energy, and improvement in energy efficiency is required.

The object of the present invention is to provide an unloader with improved energy efficiency.

Means for solving technical problems

The unloading machine of the present invention has: an unloading unit for unloading objects; a transport unit for transporting the objects unloaded by the unloading unit; a drop unit for dropping the objects transported by the transport unit; The potential energy of the object is converted into electrical energy.

According to the above configuration including the conversion unit, the potential energy when the object is unloaded is converted into electrical energy when the object falls. Thereby, the converted electric energy can be utilized, and therefore, the energy generated by lifting and lowering of the cargo can be effectively used, and the energy efficiency can be improved.

In addition, the unloading unit can continuously unload the object. At this time, since the unloading unit continuously unloads the object, the object continuously falls on the dropping portion, and therefore the potential energy can be continuously converted into electric energy, and a large amount of stable electric energy can be obtained.

In addition, the conversion unit may have an impeller that rotates by colliding with the object. In this case, a structure that converts potential energy into electric energy to effectively utilize energy can be realized with a simple structure.

Furthermore, the dropping part may include a guide part that guides the object so that the object collides with the blades of the impeller. In this case, since more objects can collide with the blade, energy efficiency can be further improved.

In addition, the dropping part may be provided with a cylindrical chute, and the object falls inside the chute. At this time, since the object falls inside the chute, it is possible to suppress diffusion of dust and the like generated from the object.

Moreover, the impeller may also be arranged on the lower end side of the chute, and a hopper for storing objects may also be arranged on the lower side of the chute, and the impeller may also be arranged at a height higher than the storage limit height of the objects in the hopper. Location. At this time, the vertical distance between the upper end of the drop portion and the impeller can be lengthened, and thus potential energy can be increased to thereby obtain more electric energy.

In addition, an observation window capable of observing the inside may be provided in the chute. At this time, since the impeller inside the chute can be observed from the outside of the chute, maintenance of the impeller inside the chute, etc. can be easily performed.

The unloader of the present invention is a bucket elevator type unloader provided with a bucket elevator for continuously conveying an object, and the bucket elevator has a plurality of buckets for scooping and loading an object and an endless chain for holding the plurality of buckets, The unloader has: a converter, connected to the power supply; an inverter, connected to the converter; a load motor, connected to the inverter, the converter and the inverter are connected through a DC bus, and the converter utilizes the braking of the load motor The energy generated by the action is regenerated.

According to the above configuration including the converter, the energy generated by the braking operation of the load motor is converted into electric energy to perform energy regeneration. As a result, energy is not released into the atmosphere as heat during the braking operation of the brake, and the energy is regenerated into electric energy, thereby improving energy efficiency.

In addition, the load motor may be a motor that drives the chain and makes it circle. The chain circles in the forward direction when the object is conveyed, and the converter regenerates energy when the chain rotates in the reverse direction. At this time, energy is regenerated by the braking action when the chain turns in the opposite direction, so the energy in the reverse rotation can be effectively used to improve energy efficiency.

In addition, the unloader may include a main body that can be installed on the pier and a boom that is rotatable relative to the main body and provided with a bucket elevator, and the load motor may be a motor that rotates the boom. In addition, the unloader may include a main beam that can run on the pier, and the load motor may be a motor that drives the main beam.

According to the present invention, it is possible to provide an unloader with improved energy efficiency.

Description of drawings

FIG. 1 is a diagram showing an unloader according to a first embodiment.

Fig. 2 is a partially cutaway perspective view of the upper part of the bucket elevator of the unloader shown in Fig. 1 .

Fig. 3 is a perspective view showing the inside of a dropping part in the unloader of Fig. 1 .

Fig. 4 is a perspective view of a dropping portion in the unloader of Fig. 1 viewed from a direction opposite to that of Fig. 3 .

Fig. 5 is a side view showing the lower portion of the chute and the inside of the hopper in the drop section of Fig. 3 .

Fig. 6 is a block diagram showing a schematic configuration of a power system in the unloader shown in Fig. 1 .

Fig. 7 is a block diagram showing the configuration of an electric system in the unloader according to the second embodiment.

Fig. 8 is a graph showing the relationship between time elapse and energy consumption in the unloader according to the second embodiment.

Detailed ways

Hereinafter, embodiments of the unloader according to the present invention will be described in detail with reference to the drawings.

(first embodiment)

As shown in FIGS. 1 and 2 , the unloader 1 is a bucket elevator-type ship continuous unloader (CSU) for continuously unloading the target object, that is, bulk cargo M (such as coke or ore, etc.) from the cabin 103 of the ship. installation. The unloader 1 includes a main beam 2 capable of traveling along the pier 101 via two guide rails 3 a laid in parallel to the pier 101 . The main girder 2 is a main part that can be arranged on the wharf 101 . A revolving frame 5 is rotatably supported on the main girder 2 , and a bucket elevator 9 (unloading unit) is supported on a front end portion of a boom 7 protruding laterally from the revolving frame 5 . The bucket elevator 9 maintains the bucket elevator 9 vertically regardless of the heave angle of the boom 7 through the balance bar 12 and the counterweight 13 .

The unloader 1 includes a cylinder 15 for adjusting the heave angle of the boom 7 . When the cylinder 15 is extended, the boom 7 is directed upward to raise the bucket elevator 9 , and when the cylinder 15 is shortened, the boom 7 is directed downward to lower the bucket elevator 9 .

The bucket elevator 9 continuously excavates and scoops the bulk cargo M in the cabin 103 through the scooping part 11 of the side excavation type provided at the lower part thereof, and conveys the scooped bulk cargo M upward to unload the bulk cargo M.

The bucket elevator 9 includes an elevator main body 23 constituting an elevator shaft 21 and a chain bucket 29 that orbits with respect to the elevator main body 23 . The chain bucket 29 includes a chain (ring chain) 25 which is a pair of roller chains connected endlessly, and a plurality of buckets 27 whose both ends are supported by the pair of chains 25 . Specifically, two chains 25 are arranged side by side in a direction perpendicular to the paper surface of FIG. 1 , and as shown in FIG. On this chain 25,25.

In addition, the bucket elevator 9 is further provided with drive rollers 31 a , 31 b , and 31 c around which the chain 25 is wound, and a deflection roller 33 which guides the chain 25 . The drive roller 31a is provided on the uppermost portion 9a of the bucket elevator 9 , the drive roller 31b is provided at the front of the scooping unit 11 , and the driving roller 31c is provided at the rear of the scooping unit 11 . The steering roller 33 is a driven roller located slightly below the driving roller 31 a and serves to guide the chain 25 and switch the traveling direction of the chain 25 . Furthermore, a cylinder 35 is installed between the drive roller 31b and the drive roller 31c, and the distance between the arrangement shafts of the two drive rollers 31b, 31c can be changed by extending and contracting the cylinder 35, whereby the movement of the chain bucket 29 can be changed. orbit around. In addition, since there are two chains 25, there are also two drive rollers 31a, 31b, 31c and two deflection rollers 33, and they are arranged side by side in a direction perpendicular to the paper surface of FIG. 1 .

The drive rollers 31a, 31b, 31c drive the chain 25, thereby causing the chain 25 to move around in the direction of the arrow W (circling in the positive direction) relative to the elevator main body 23 on a prescribed trajectory. The chain bucket 29 is at the top of the bucket elevator 9 9a and the scooping part 11 move around and circulate.

As shown in FIG. 2 , the bucket 27 of the chain bucket 29 moves upward with the opening 27 a facing upward. And, when the uppermost part 9a of the bucket elevator 9 passes the driving roller 31a, the direction of the chain 25 is changed from upward to downward, and the opening 27a of the bucket 27 is turned downward. A discharge chute 36 is formed below the opening 27 a of the bucket 27 facing downward in this way. The lower end of the discharge chute 36 is connected to a rotary feeder 37 arranged on the outer periphery of the bucket elevator 9 .

The rotary feeder 37 is used to convey the bulk goods M carried out from the discharge chute 36 to the boom 7 side. As shown in FIG. 1 , the boom 7 is provided with a boom conveyor 39 which is a conveyance unit for conveying the bulk cargo M unloaded by the bucket elevator 9 , and the boom conveyor 39 receives the bulk cargo M received from the rotary feeder 37 It is supplied to the falling part 60 mentioned later. Below the dropping part 60, the belt feeder 43 and the conveyor 45 located in the unloader are arrange|positioned.

The bulk cargo M is unloaded using this unloader 1 as follows. The scooping part 11 at the lower end of the bucket elevator 9 is inserted into the cabin 103, and the chain 25 is looped in the direction of the arrow W in the drawing. In this way, the bucket 27 located in the scooping part 11 continuously excavates and scoops bulk goods M such as coke and ore. Next, the bulk cargo M scooped up and loaded by these buckets 27 is conveyed vertically upward to the uppermost part 9 a of the bucket elevator 9 as the chain 25 ascends.

Thereafter, the bucket 27 passes the position of the driving roller 31 a, and the bulk cargo M is turned over by the bucket 27 and falls from the bucket 27 . The bulk cargo M dropped from the bucket 27 falls into the discharge chute 36 and is carried out to the rotary feeder 37 side, and then transferred to the boom conveyor 39 to be conveyed to the upper end of the drop portion 60 . Next, the bulk cargo M falls from the dropping part 60 and is carried out to the land-side facility 49 via the belt feeder 43 and the in-machine conveyor 45 . By repeating the above-mentioned operation with the plurality of buckets 27, the bulk cargo M in the hold 103 is continuously unloaded.

However, in conventional unloaders, the energy generated by lifting and lowering bulk cargo cannot be effectively utilized, and there is a problem of low energy efficiency. On the other hand, in the unloader 1 of this embodiment, the potential energy when the bulk cargo M falls on the dropping part 60 is utilized effectively. The drop portion 60 will be described in detail below.

As shown in FIGS. 3 to 5 , the drop unit 60 includes a cylindrical chute 61 for dropping the bulk cargo M, and a hopper 68 for receiving the bulk cargo M dropped through the inside of the chute 61 . On the lower end side of the chute 61, the impeller 65 provided with the blade 65a which rotates by collision with the bulk goods M is provided. The chute 61 is formed so that the area of the internal space thereof becomes smaller as it goes downward. By doing so, the falling path of the bulk cargo M falling inside can be defined, and the diffusion of dust, etc. generated from the bulk cargo M can be suppressed.

Guide plates 62a, 62b are provided on the upper part of the chute 61, and the guide plates 62a, 62b receive the bulk goods M conveyed by the boom conveyor 39, and guide the bulk goods M so that the bulk goods M and the blades 65a of the impeller 65 collision. The guide plate 62 a is provided to extend vertically at a position facing the boom conveyor 39 , and the guide plate 62 b is provided to extend obliquely from the lower portion of the boom conveyor 39 . The guide plates 62a, 62b are arranged to face each other, and the bulk cargo M conveyed by the boom conveyor 39 collides with the guide plates 62a, 62b, falls through the chute 61, and collides with the blade 65a on one side of the impeller 65. . In addition, in order to collide the bulk cargo M with one blade 65 a of the impeller 65 , it is preferable that the guide plate 62 a is provided on the guide plate 62 b side with respect to the center of the impeller 65 .

In addition, an observation window 63 through which the interior can be observed is provided on the chute 61 . The observation window 63 is, for example, an opening. An operator or the like can observe the impeller 65 inside the chute 61 through the observation window 63 , and can easily perform maintenance and the like of the impeller 65 . In addition, the structure, position, and number of observation windows 63 are not particularly limited. That is, the observation window 63 does not need to be a simple opening as shown in FIGS. 3 and 4 , but may be provided with a door that can be freely opened and closed, for example.

The impeller 65 includes eight blades 65a on a shaft portion 65b rotating around a shaft extending in the horizontal direction, and the fallen bulk cargo M collides with the blades 65a to rotate the shaft portion 65b. A hole (not shown) through which the shaft 65b is inserted is formed in the part behind the impeller 65 of the chute 61, and as shown in FIG. 4, a speed increaser 66 is provided outside the hole. Furthermore, a generator 67 is provided adjacent to the speed increaser 66 . The shaft portion 65 b is connected to a speed increaser 66 , the rotation of the shaft portion 65 b is transmitted to the speed increaser 66 , and the speed increaser 66 increases the rotational speed of the rotation and transmits it to the generator 67 . In this way, the rotation of the shaft portion 65b obtained by the collision of the bulk cargo M with the blade 65a is transmitted to the generator 67 through the speed increaser 66, and is converted into electric energy by the generator 67.

The hopper 68 is used for storing bulk goods M, and is arranged on the lower side of the chute 61 as shown in FIG. 5 . The hopper 68 has a cylindrical shape, and is formed such that the area of its internal space becomes smaller as it goes downward. Furthermore, the hopper 68 is provided with the limit switch 69 provided with the blade|wing 69a which rotates in a horizontal direction. The height position of the vane 69 a of the limit switch 69 is consistent with the storage limit height L of the bulk goods M in the hopper 68 . Thus, when the bulk goods M accumulated in the hopper 68 have not yet reached the storage limit height L, the blade 69a continues to rotate. When the bulk goods M reach the storage limit height L, the bulk goods M hinder the rotation of the blade 69a, and the blade 69a stops. rotate. The limit switch 69 detects that the bulk cargo M has reached the storage limit height L by detecting that the blade 69a stops rotating, and outputs a signal to the control unit (not shown) of the unloader 1 .

If the control part receives the signal from the limit switch 69, it controls the actions of the bucket elevator 9 and the boom conveyor 39, and stops the unloading of the bulk goods M by the bucket elevator 9 and the movement of the boom conveyor 39. Handling of bulk cargo M. In addition, the control unit controls the bucket elevator 9 and the boom conveyor 39 so that the amount of the bulk goods M dropped from the dropping unit 60 is constant, for example, when the bucket elevator 9 unloads a large amount of bulk goods M, the bucket 27 and the boom are lowered. The moving speed of the conveyor 39 increases the moving speed of the bucket 27 and the boom conveyor 39 when the unloading amount of the bulk goods M of the bucket elevator 9 is small, so that the bulk goods M dropped from the dropping part 60 per unit time The quantity of goods M becomes constant.

In addition, the electric energy converted by the generator 67 as described above is supplied to the load motor 75 for driving the driving rollers 31a, 31b, 31c in the power system 70 of the unloader 1 as shown in FIG. 6 . The power supply system 70 includes the load motor 75 , a power supply 71 , a transformer 72 , an AC/AC converter 73 , and an inverter 74 . The transformer 72 , the AC/AC converter 73 , and the inverter 74 are installed in the electric room E of the unloader 1 .

The power supply 71 is a ground power supply, and supplies AC power to the transformer 72 . The transformer 72 converts the voltage of the AC power supplied from the power supply 71 into a predetermined voltage and supplies it to the inverter 74 . The inverter 74 supplies the power supplied from the transformer 72 to the load motor 75 , and the load motor 75 is driven by the power from the inverter 74 . In this way, by operating the load motor 75 to drive the driving rollers 31a, 31b, and 31c, the chain 25 is looped in the arrow W direction, and the bucket elevator 9 is driven.

In addition, in this embodiment, the generator 67 and the AC/AC converter 73 are provided as described above, and the generator 67 supplies electric power to the AC/AC converter 73 . The AC/AC converter 73 converts the frequency of the electric power from the generator 67 into a predetermined frequency and supplies the electric power to the inverter 74 . Next, the inverter 74 plays a role of supplying the power supplied from the AC/AC converter 73 to the load motor 75 and assisting the power supply from the power source 71 to the load motor 75 .

As mentioned above, in the unloader 1 according to the present embodiment, since the impeller 65, the speed increaser 66, and the generator 67 functioning as the conversion part are provided, the potential energy when unloading the bulk cargo M is converted into electric energy when it falls, and it can be Since the converted electric energy is used, the energy generated by raising and lowering the bulk cargo M can be effectively used, and energy efficiency can be improved. In addition, since power can be supplied from the generator 67, power consumption from the power source 71 can be reduced, and the capacity of electric equipment that supplies power from the power source 71 to the load motor 75 can be reduced, thereby reducing equipment costs.

In addition, the unloader 1 is a bucket elevator type continuous unloader. As mentioned above, the bucket elevator 9 can continuously unload the bulk goods M and continuously convert the potential energy of the bulk goods M when they fall on the drop part 60 into electrical energy. Get a lot of and stable power.

Moreover, since the impeller 65 is provided as the conversion part, a structure capable of effectively utilizing energy efficiency can be realized with a simple structure, and since the guide plates 62a, 62b that function as guide parts are provided, more bulk goods M can be placed on the impeller 65a. Collisions, so energy efficiency can be further improved.

In addition, the impeller 65 is provided on the lower end side of the chute 61 at a position higher than the storage limit height L of the bulk goods M in the hopper 68 . Therefore, the vertical distance between the upper end of the drop part 60 and the impeller 65 can be lengthened, and the potential energy of the bulk goods M can be increased to thereby obtain more electric energy. Moreover, by causing the bulk cargo M to collide with the blade 65a of the impeller 65, the impact when the bulk cargo M falls into the hopper 68 can be alleviated.

(second embodiment)

Next, a second embodiment of the unloader will be described with reference to FIGS. 7 and 8 . The unloader of the second embodiment is a continuous unloader (CSU) for ships of a bucket elevator type similarly to the unloader 1 of the first embodiment shown in FIGS. 1 and 2 . Hereinafter, the parts of the unloader of the second embodiment that are different from the unloader 1 of the first embodiment will be mainly described, and redundant description will be omitted.

The unloader according to the second embodiment includes a bucket motor (not shown) that drives the drive rollers 31a, 31b, and 31c, a swing motor (not shown) that rotates the swivel frame 5, and a travel motor that travels the main beam 2. (not shown), and a boom conveyor motor (not shown) that drives the boom conveyor 39 . The motor for the bucket, the swing motor, the travel motor, and the motor for the boom conveyor are powered by a power supply 171 of a power supply system 170 shown in FIG. 7 to operate. Hereinafter, the bucket motor, the swing motor, and the travel motor will be described as the load motor 175 , and the boom conveyor motor will be described as the motor 185 .

The power supply system 170 includes the above-mentioned power supply 171 , converter 172 , inverter 173 , load motor 175 , power switch 182 , and motor 185 . The power supply 171 is a commercial power supply and supplies AC power to the converter 172 . Converter 172 converts AC power supplied from power supply 171 into DC power. The converter 172 and the inverter 173 are connected through the DC bus B, and the DC power converted by the converter 172 is supplied to the inverter 173 through the DC bus B. The inverter 173 converts the DC power from the converter 172 into AC power of a predetermined frequency and supplies the AC power to the load motor 175 . The load motor 175 is driven by AC power from the inverter 173 , and the load motor 175 drives the driving rollers 31 a , 31 b , and 31 c , rotates the rotating frame 5 , and travels the main girder 2 , for example.

Furthermore, the power supply 171 supplies AC power to the motor 185 via the power switch 182 . The power switch 182 is a contactor that is turned on/off by an external switching operation. When the power switch 182 is turned off, AC power from the power source 171 to the motor 185 is cut off, and when the power switch 182 is turned on, AC power is supplied from the power source 171 to the motor 185 . The motor 185 is operated by AC power from the power supply 171 , and the operation of the motor 185 drives the boom conveyor 39 , for example.

In addition, in the unloader of the present embodiment, when the movement of the bucket 27, the rotation of the rotating frame 5, or the running of the main beam 2 are braked by a brake (not shown), the energy at the time of braking is converted. into electrical energy. In addition, in the conventional unloader, the damping resistor is connected to the inverter, and when the above-mentioned braking operation is performed, electric energy is further converted into thermal energy through the damping resistor and discharged into the atmosphere.

Since the unloader is very heavy, the amount of heat energy discharged into the atmosphere is also very large. In the conventional unloader, energy efficiency is low and energy during braking cannot be effectively used. In addition, conventional unloaders also have the following problems: in order to prevent sudden rotation of the boom when strong winds are generated, for example, a large amount of electric energy is required, and a large amount of heat energy is generated during braking, so it is necessary to provide a cooling device. Damping resistors are adversely affected by receiving large amounts of power.

In contrast, in the unloader of the present embodiment, energy generated by the braking operation of the load motor 175 is converted into electric energy to perform energy regeneration. Specifically, when the movement of the bucket 27, the rotation of the rotating frame 5, or the travel of the main girder 2 are braked, the load motor 175 supplies electric energy to the converter 172 through the inverter 173 and the DC bus B, and the converter 172 172 supplies the supplied electric energy to the motor 185 through the power switch 182 .

Furthermore, the converter 172 also performs energy regeneration when the bucket 27 is moved in the direction opposite to the arrow W due to gravity or the like in order to discharge the bulk cargo M or the like in the bucket 27 . At this time, the motor 185 operates by receiving electric power from the power supply 171 and electric power regenerated by the converter 172 . As the converter 172 operated in this way, an IGBT converter etc. are mentioned, for example.

In the unloader according to the present embodiment, as described above, the converter 172 performs energy regeneration using the energy generated by the braking operation of the load motor 175 . This prevents energy from being released into the atmosphere as heat during the braking operation and regenerates the energy into electric energy. Therefore, it is possible to reduce cost and improve energy efficiency by suppressing consumption of electric power supplied from power supply 171 . Furthermore, it is possible to improve the energy required for unloading a certain amount of bulk cargo M (that is, the energy consumption rate).

Specifically, for example, as shown in Fig. 8, if the energy consumption of the unloader as a whole is set as energy C, the braking start time is set as time t ₁ , and the braking end time is set as time t ₂ , the conventional unloader The energy usage is set as the usage L1, and the energy usage of the unloader of the present embodiment is the usage L2, then the usage L2 in the time between the time _t1 and the time _t2 is lower than that in this time By using the amount L1, the energy C between the time _t1 and the time _t2 can be reduced in the unloader of this embodiment.

Moreover, in the unloader of this embodiment, since energy regeneration is performed also when the chain 25 rotates in the reverse direction, energy at the time of reverse rotation can be utilized effectively and energy efficiency can be improved.

In addition, in the unloader of this embodiment, as described above, the energy generated by the braking operation of the load motor 175 is converted and energy is regenerated, so the damping resistor used in the conventional unloader is no longer necessary, and It is possible to suppress the generation of heat energy due to the damping resistance. Therefore, a large amount of heat energy will not be released, a cooling device required when the heat energy is large is not required, and the problem of adverse effects on the damping resistance can be avoided.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It can change in the range which does not change the gist described in each claim. For example, in the first embodiment, an example in which two guide plates 62a and 62b functioning as guides are provided so as to face each other has been described, but the shape, number and arrangement of the guides are not limited to this example. In addition, instead of the guide plates 62a and 62b, a guide plate whose angle can be adjusted by a handle or the like may be provided, for example.

Furthermore, in the first embodiment, an example using the impeller 65 having eight blades 65a was described, but the number of blades 65a need not be eight, and the shape of the impeller 65 is not limited to this example, either. In addition, a structure other than the impeller 65 may be used, as long as it is a structure which can convert the collision energy when the bulk cargo M falls into electric energy.

In addition, in the first embodiment, the example in which the impeller 65 is provided on the lower end side of the chute 61 has been described, but it is not limited to the lower end side of the chute 61 , and may be provided near the center of the chute 61 , for example.

Furthermore, in the first embodiment, an example in which the impeller 65, the speed increaser 66, and the generator 67 were provided as the conversion unit was described, but the configuration of the conversion unit is not limited to this example. That is, piezoelectric elements may be provided in the chute 61 instead of the impeller 65 , the speed increaser 66 and the generator 67 . At this time, the potential energy of the bulk cargo M is converted into pressure energy by colliding the bulk cargo M with the piezoelectric element, and the pressure energy is converted into electrical energy, whereby the same effect as that of the first embodiment can be obtained.

Furthermore, in the first embodiment, an example using the limit switch 69 provided with the blade 69a rotating in the horizontal direction was described, but the structure of the switch that detects whether the bulk cargo M has reached the storage limit height L Nor is it limited to this example. For example, a balloon-shaped switch or a rod-shaped switch containing air inside can be used instead of the limit switch 69, any of which can detect that the bulk cargo M has reached the storage limit height L by contacting the bulk cargo M with the switch . In addition, the limit switch 69 may not be required, and the storage amount of the bulk goods M in the hopper 68 may be checked visually or by a camera by an operator or the like.

Moreover, in 1st Embodiment, the example which stopped the conveyance of the bulk cargo M when the limit switch 69 detected that the bulk cargo M reached the storage limit height L was demonstrated, However, the conveyance of the bulk cargo M does not need to be stopped. Specifically, for example, instead of stopping the conveyance of the bulk cargo M, the speed of unloading the bulk cargo M may be changed, and the fact that the bulk cargo M has reached the storage limit height L may be output to a display in the operating room, etc. The driver takes manual control.

In addition, in the first embodiment, an example in which the electric energy converted by the generator 67 is used for the operation of the load motor 75 has been described, but the above-mentioned electric energy may be supplied to the unloader 1 such as the boom conveyor 39 or the lamp, for example. Other devices inside, or other equipment other than unloader 1. Furthermore, an electric storage device may be provided to store the above-mentioned electric energy.

In addition, in the first embodiment, the example in which the present invention is applied to the unloader 1 provided with the bucket elevator 9 has been described, but the bucket elevator 9 may not be provided, and the present invention can be applied to other than the bucket elevator. Unloaders other than the suction type or clip-in type.

Moreover, in 1st Embodiment, although the example which provided the observation window 63 in the chute 61 was demonstrated, this observation window 63 does not need to exist. Furthermore, a camera may be provided inside the chute 61 instead of the observation window 63, and at this time, the inside of the chute 61 can be observed using the video of the camera.

In addition, in the second embodiment, the bucket motor, the swing motor, and the traveling motor were illustrated as the load motor 175 as the drive source for generating regenerative energy, but the drive source for generating regenerative energy is not limited to these, and for example, A brake that prevents the boom from rotating due to wind. In this case, a large amount of regenerative energy can be obtained when a strong wind is generated.

Furthermore, in the second embodiment, the regenerative energy is supplied to the motor 185 which is the motor for the boom conveyor, but not limited to the motor 185, regenerative energy may be supplied to other devices in the unloader or other equipment other than the unloader. Furthermore, an accumulator may be provided to store regenerative energy.

Industrial availability

The invention is applicable to an unloader with improved energy efficiency.

Symbol Description

1-unloader, 2-main beam (main part), 7-boom, 9-bucket elevator (unloading part), 25-chain (ring chain), 27-bucket, 39-boom conveyor (handling part), 60-falling part, 61-chute, 62a, 62b-guide plate (guiding part), 63-observation window, 65-impeller (converting part), 65a-blade, 66-increasing gear (converting part) , 67-generator (conversion department), 68-hopper, 171-power supply, 172-converter, 173-inverter, 175-load motor, B-DC bus, L-storage limit height, M-bulk cargo ( object).

Claims (12)

1. An unloader, characterized in that, possesses: The unloading part is to unload the object; a conveying unit that conveys the object unloaded by the unloading unit; a drop unit for dropping the object transported by the transport unit; and The converting unit converts the potential energy of the object falling from the falling part into electrical energy. 2. The unloader according to claim 1, characterized in that, The unloading unit unloads the object continuously. 3. The unloader according to claim 1 or 2, characterized in that, The conversion unit has an impeller that rotates upon collision with the object. 4. The unloader according to claim 3, characterized in that, The dropping part includes a guide part that guides the object so that the object collides with the blade of the impeller. 5. The unloader according to claim 1 or 2, characterized in that, The dropping part is equipped with a cylindrical chute, The object falls inside the chute. 6. The unloader according to claim 5, characterized in that, The impeller is arranged on the lower end side of the chute. 7. The unloader according to claim 5, characterized in that, A hopper for storing the object is provided on the lower side of the chute, The impeller is provided at a position higher than a storage limit height of the object in the hopper. 8. The unloader according to claim 5, characterized in that, The chute is provided with an observation window capable of observing the inside thereof. 9. An unloader, which is a bucket elevator type unloader provided with a bucket elevator for continuously conveying objects, the bucket elevator having a plurality of buckets for scooping up and loading objects and holding the plurality of buckets The ring chain, the unloader is characterized in that it has: A converter connected to the power supply; an inverter connected to said converter; and load motor, connected with the inverter, The converter is connected to the inverter via a DC bus, The converter regenerates energy using energy generated by a braking operation of the load motor. 10. The unloader according to claim 9, characterized in that, The load motor is a motor that drives the endless chain and makes it circle, The chain circles in the positive direction when carrying the object, The converter performs the energy regeneration when the chain rotates in the opposite direction. 11. The unloader according to claim 9, characterized in that, The unloader includes: a main body that can be installed on the upper surface of a pier; The load motor is a motor that rotates the boom. 12. The unloader according to claim 9, characterized in that, Equipped with a main girder capable of driving on the wharf, The load motor is a motor that drives the main girder.