JP2018203416A - Quay crane and motor capacity determination method for quay crane - Google Patents

Abstract

To provide a quay crane and a motor capacity determination method for the quay crane, which are capable of reducing cost and a motor weight by reducing the total capacity of four motors while preventing interference with operations of a trolley and a suspension tool.SOLUTION: The capacity ratios of two seaside motors M2, M4 to two land-side motors M1, M3 are determined on the basis of the ratio of a hoisting speed Vh to a traverse-motion speed Vt of a suspension tool 8 when the suspension tool 8 traversely moves to a land side while being hoisted within a range where the capacities of the two seaside motors M2, M4 are smaller than those of the two land-side motors M1, M3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a quay crane and a method for determining a motor capacity of a quay crane, and more particularly to a quay crane that drives a sea-side drum and a land-side drum by a total of four motors and a method for determining a motor capacity of the quay crane.

  Conventionally, unloaders that are a type of quay crane have been used in harbors that handle loose objects (see, for example, Patent Document 1). This unloader includes a total of four drums: two sea side drums arranged on the sea side and two land side drums arranged on the land side. The quay crane includes a total of four motors including two motors for driving two sea-side drums and two motors for driving two land-side drums, respectively.

  The unloader includes a girder, a trolley that can be traversed on the girder, and a hanging tool that is disposed under the trolley. Two sea-side wires connected to the hanger via the trolley, and two land-side wires connected to the hanger via the land-side end of the girder and the trolley from the two land-side drums, respectively. Side wires.

JP 2014-189389 A

  In the quay crane described above, the rated capacities (kw: hereinafter referred to as capacities) of the four motors were all the same value. If the total capacity of the four motors can be reduced while preventing the operation of the trolley and the suspension tool from being hindered, the cost of the quay crane can be reduced overall and the motor weight can be reduced. However, until now no such quay crane has been developed.

  The present invention has been made in view of the above, and an object of the present invention is to reduce the total capacity of the four motors and reduce the cost while preventing the operation of the trolley and the suspension. And a method for determining a motor capacity of a quay crane and a quay crane capable of reducing a motor weight.

  The quay crane of the first aspect of the present invention that achieves the above object includes two sea side drums arranged on the sea side, two land side drums arranged on the land side, and two sea side drums, respectively. Two sea-side motors to drive, two land-side motors respectively driving the two land-side drums, a trolley that can be traversed on a girder, and a hanging tool that is arranged under the trolley Two sea-side wires respectively connected from the two sea-side drums to the suspension device via the sea-side end of the girder and the trolley, and the land of the girder from the two land-side drums A quay crane comprising two land-side wires respectively connected to the suspension tool via the trolley and the end of the side, and each capacity of the two sea-side motors is equal to that of the two land-side motors. It is set smaller than each capacity, and two before Characterized in that each volume of the landward motor is set to less than 120% to 100% or more reference motor capacity set in advance.

  The quay crane of the second aspect of the present invention that achieves the above object is a sea-side opening / closing drum that is disposed on the sea side and wound with a sea-side opening / closing wire, and a land-side opening / closing wire that is wound on the land side. A land-side opening / closing drum, a sea-side supporting drum disposed on the sea side and wound with a sea-side supporting wire, a land-side supporting drum disposed on the land side and wound with a land-side supporting wire, and the sea-side opening / closing Two open / close motors that respectively drive the drum and the land-side open / close drum, two support motors that respectively drive the sea-side support drum and the land-side support drum, and a trolley that is arranged to traverse along the girder And an opening / closing part configured to connect the seaside opening / closing wire and the land side opening / closing wire, and a seaside side. Support wire and the land side In a quay crane including a support portion connected to a holding wire, each capacity of the two support motors is set smaller than each capacity of the two opening / closing motors, and each capacity of the two opening / closing motors Is set to 100% or more and 120% or less of a preset reference motor capacity.

  The method for determining the motor capacity of a quay crane according to the present invention includes two sea side drums arranged on the sea side, two land side drums arranged on the land side, and two driving the two sea side drums, respectively. Two seaside motors, two landside motors that respectively drive the two landside drums, a trolley that can be traversed on the girder, a suspension that is placed under the trolley, and two Two seaside wires respectively connected from the seaside drum to the seaside end of the girder and the suspender via the trolley, and the landside end of the girder from two landside drums And a land-side wire connected to the suspension via the trolley, and a method for determining a motor capacity of a quay crane, each of which has two capacities of the two sea-side motors. In a range smaller than each capacity of the land side motor Based on the ratio of the hoisting speed and the traverse speed of the hoist when traversing to the land side while the hoist is hoisted, the capacities of the two sea-side motors and the capacities of the two land-side motors The ratio is determined.

  According to the present invention, it is possible to reduce the total capacity of the four motors while preventing the operation of the trolley and the suspension tool from being hindered. Reduction can be achieved.

  Each capacity of the two sea side motors can be set to 30% to 70% of each capacity of the two land side motors. The capacity of one sea side motor can be set to 80% or more and 120% or less with respect to the capacity of the other sea side motor. The capacity of one land-side motor can be set to 80% or more and 120% or less with respect to the capacity of the other land-side motor.

  According to the method for determining the motor capacity of a quay crane according to the present invention, the motor capacity can be determined based on the actual use conditions of the quay crane. Can be provided.

It is explanatory drawing which illustrates the quay crane of this invention. It is explanatory drawing which illustrates the mechanism which drives the trolley and hanging tool of the quay crane of FIG. It is explanatory drawing which illustrates the state at the time of traversing of the trolley of FIG. It is explanatory drawing which illustrates the state at the time of winding up the hanging tool of FIG. It is explanatory drawing which illustrates the state at the time of closing operation of the hanging tool of FIG. It is explanatory drawing which illustrates the movement path | route of a hanging tool. It is explanatory drawing which illustrates the relationship between the speed which winds a wire, and the speed of a hanging tool. It is a table | surface which illustrates the output of each motor in the movement path | route of the hanging tool of FIG.

  Hereinafter, the determination method of the motor capacity of the quay crane 1 and the quay crane 1 which concerns on embodiment of this invention is demonstrated, referring drawings. Regarding the drawings, the dimensions are changed from the actual product so that the configuration is easy to understand, and the ratio of the thickness, width, length, etc. of each member and each component does not necessarily match the actual product ratio. Not necessarily.

  A quay crane 1 according to the present embodiment shown in FIG. 1 is a quay crane mainly used when unloading loose objects from a ship (bulk ship 20), and is an unloader, specifically a rope trolley type unloader. In FIG. 1, the left side is the sea side and the right side is the land side. The quay crane 1 includes a leg structure 3 having a traveling device 2 that enables the quay crane 1 to travel along the quay, a girder 4 supported by the leg structure 3, and a undulation at an end of the girder 4 on the sea side. And a boom 5 connected to each other. Hereinafter, the girder 4 and the boom 5 are collectively referred to as a beam 6.

  Further, the quay crane 1 includes a trolley 7 that can be traversed along the girder 6 on the land side or the sea side, and includes a hanging tool 8 that is suspended below the trolley 7 so as to be lifted and lowered. Although the specific kind of the hanging tool 8 is not specifically limited, in this embodiment, a grab bucket is used as an example.

  A machine room 10 is installed in the leg structure 3 of the quay crane 1, and four drums that are individually driven by motors described later are installed in the machine room 10. As illustrated in FIG. 2, the four drums include a land-side support drum D1 and a land-side opening / closing drum D3 disposed on the land side, and a sea-side support drum D2 and a sea-side opening / closing drum D4 disposed on the sea side. Become.

  The land-side support drum D1 and the land-side opening / closing drum D3 may be collectively referred to as land-side drums D1 and D3. The sea side support drum D2 and the sea side opening / closing drum D4 may be collectively referred to as sea side drums D2 and D4. Further, the land side support drum D1 and the sea side support drum D2 may be collectively referred to as support drums D1 and D2. The land side opening / closing drum D3 and the sea side opening / closing drum D4 may be collectively referred to as opening / closing drums D3, D4.

  The drums D1 to D4 are provided with motors M1 to M4, respectively, for rotating the drums. The land side support motor M1 drives (specifically, rotates) the land side support drum D1, and the sea side support motor M2 drives the sea side support drum D2. The land side opening / closing motor M3 drives the land side opening / closing drum D3, and the sea side opening / closing motor M4 drives the sea side opening / closing drum D4.

  The land-side support motor M1 and the land-side opening / closing motor M3 may be collectively referred to as land-side motors M1 and M3. The sea side support motor M2 and the sea side opening / closing motor M4 may be collectively referred to as sea side motors M2 and M4. Further, the land-side support motor M1 and the sea-side support motor M2 may be collectively referred to as support motors M1 and M2. The land side opening / closing motor M3 and the sea side opening / closing motor M4 may be collectively referred to as opening / closing motors M3, M4.

  The land-side land-side support wire W1 wound around the land-side support drum D1 and the land-side land-side open / close wire W3 wound around the land-side open / close drum D3 are respectively connected to the land-side end (land-end side) of the girder 4. The grab bucket 8 (hanging tool) is suspended through the trolley upper pulley P5 and the trolley upper pulley P7 provided on the trolley 7 via the arranged land end side pulley P1 and land end side pulley P3. Further, the sea side support wire W2 wound around the sea side support drum D2 and the sea side open / close wire W4 wound around the sea side opening / closing drum D4 are arranged at the sea side end (sea end side) of the boom 5, respectively. The grab bucket 8 is suspended via the trolley upper pulley P6 and the trolley upper pulley P8 provided on the trolley 7 via the sea end side pulley P2 and the sea end side pulley P4.

That is, the sea side support wire W2 and the sea side opening / closing wire W4 are composed of two sea side drums D2, D.
4 corresponds to two sea side wires W2 and W4 connected to the grab bucket 8 through the sea end of the beam 6 and the trolley 7, respectively. The land-side land-side support wire W1 and the land-side land-side opening / closing wire W3 are connected to the grab bucket 8 from the two land-side drums D1, D3 via the land-side end of the beam 6 and the trolley 7, respectively. It corresponds to two land-side wires W1 and W3.

  When the hanging tool 8 is formed of a grab bucket, the grab bucket is an open / close connected to a land-side open / close wire W3 and a sea-side open / close wire W4 (hereinafter, collectively referred to as open / close wires W3, W4). And a support portion to which a land-side support wire W1 and a sea-side support wire W2 (hereinafter sometimes collectively referred to as support wires W1 and W2 9) are connected.

  The quay crane 1 includes a control device 11 in the machine room 10. The control device 11 controls the rotational speeds of the motors M1 to M4 based on, for example, a command by an operation of a crane operator, so that the land side support drum D1, the sea side support drum D2, the land side opening / closing drum D3, and the sea side opening / closing are performed. By controlling the rotation of the drum D 4, the traversing operation of the trolley 7 on the girder 6, the lifting / lowering operation (winding and unwinding operation) of the hanging tool 8, and the opening / closing operation of the hanging tool 8 are performed. Such a control device 11 includes a CPU 12 that executes various arithmetic processes and control processes, and a ROM 13 and a RAM 14 that function as a storage unit that stores information such as programs and various data necessary for the operation of the CPU 12. It is comprised by the microcomputer provided.

  Next, general operations of the quay crane 1 will be described. As shown in FIG. 1, when unloading the transported material 21 from the bulk carrier 20, the trolley 7 is positioned on the bulk carrier 20, and the transported material 21 is gripped by the hanger 8. And while moving the trolley 7 on the hopper 9, the hanging tool 8 is opened and the conveyed product 21 is dropped to the hopper 9 as a conveyed product receiving apparatus.

  When traversing the trolley 7 from the sea side to the land side, as shown in FIG. 3, the land side support drum D1, the sea side support drum D2, the land side opening / closing drum D3 and the sea side opening / closing drum D4 are placed in the same direction (in the figure). The land-side support wire W1 and the land-side opening / closing wire W3 are wound up, and the sea-side support wire W2 and the sea-side opening / closing wire W4 are fed out. On the contrary, when the trolley 7 is made to traverse from the land end side to the sea end side, the land side support drum D1, the sea side support drum D2, the land side opening / closing drum D3 and the sea side opening / closing drum D4 are placed in the same direction (left side in the figure). The land-side support wire W1 and the land-side switching wire W3 are fed out, and the sea-side support wire W2 and the sea-side switching wire W4 are wound up.

  When raising the hanging tool 8, as shown in FIG. 4, the land-side support drum D1 and the land-side opening / closing drum D3 on the land end side are rotated clockwise in the figure, and the sea-side support drum D2 on the sea end side is rotated. The sea side opening / closing drum D4 is rotated in the opposite direction (counterclockwise in the figure) to wind up the wires W1 to W4. On the other hand, when the hanger 8 is lowered, the land-side support drum D1 and the land-side opening / closing drum D3 on the land end side are rotated counterclockwise in the drawing, and the sea-side support drum D2 and the sea-side opening / closing are opened. The drum D4 is rotated in the opposite direction (clockwise in the drawing), and the wires W1 to W4 are fed out (ie, wound down).

  When closing the hanger 8, as shown in FIG. 5, the land-side opening / closing drum D3 is rotated clockwise in the figure, and the sea-side opening / closing drum D4 is rotated in the opposite direction. W3 and the sea side open / close wire W4 are wound up. On the contrary, when opening the hanging tool 8, the land side opening / closing drum D3 is rotated counterclockwise in the figure, and the sea side opening / closing drum D4 is rotated in the opposite direction to the land side opening / closing wire W3 and the sea side. The open / close wire W4 is fed out (that is, lowered).

As shown in FIG. 6 (a), the operation when loading the transported material 21 from the bulk carrier 20 to the hopper 9 is the operation of closing the hanging tool 8 (grab bucket) in which the transported material 21 is housed (A1 operation). ), The operation of hoisting the hoisting tool 8 above the bulk carrier 20 (A2 action), the action of hoisting the hoisting tool 8 to the land side (A3 action), and the hoisting tool 8 in the horizontal direction on the land side. The operation is disassembled into an operation (A4 operation) of moving transversely and moving on the hopper 9, and an operation (A5 operation) of opening the hanging tool 8 and handling the transported material 21 on the hopper 9.

  On the other hand, as shown in FIG. 6 (b), the operation when returning the hanging tool 8 to the bulk carrier 20 is performed by moving the hanging tool 8 horizontally to the sea side (B1 operation) and winding the hanging tool 8. It is broken down into an operation (B2 operation) for moving to the sea side while moving down and moving above the bulk carrier 20 and an operation (B3 operation) for lowering the hanger 8 and moving it inside the bulk carrier 20 .

  FIG. 7 is a schematic diagram for explaining various speeds during an operation (A3 operation) of traversing the suspension 8 to the land side while winding up. In FIG. 7, the right direction corresponds to the land side, and the left direction corresponds to the sea side. Vf is the wire winding speed of the seaside wires W2 and W4 during the A3 operation, and is proportional to the rotational speed of the seaside motors M2 and M4. Vr is the wire winding speed of the land-side wires W1 and W3, and is proportional to the rotation speed of the land-side motors M1 and M3. Vh is the hoisting speed (vertical ascent speed) of the hanger 8, and Vt is the traversing speed of the hanger 8 to the land side. Here, Vf can be represented by a value obtained by subtracting Vt from Vh (Vh−Vt), and Vr can be represented by a value obtained by adding Vt to Vh (Vh + Vt).

  The outputs (kw) of the motors M1 to M4 are proportional to the product of the rotational speed of the motor and the torque (generated torque) of the motor, and the capacity (rated capacity) of the motors M1 to M4 is the power required for the operation of the quay crane 1. The output range is set. Based on the above assumptions, the motors required to calculate the rotational speed and torque of the motors M1 to M4 and generate the calculated rotational speed and torque for each of the A1 operation to A5 operation and the B1 operation to B3 operation. FIG. 8 shows the output (kw) of M1 to motor M4 calculated as a relative value (%).

  Regarding the calculation of the torque in FIG. 8, the torque is calculated based on the condition that the weight of the transportable material 21 that can be transported by the hanging tool 8 is the same as the weight of the hanging tool 8 (weight when empty). doing. That is, when the weight of the hanging tool 8 when it is unloaded is, for example, 5 tons, the weight of the transported material 21 is 5 tons, and the weight of the hanging tool 8 at the maximum loading is 10 tons.

  Further, the rotational speed of the motor in the A3 operation of FIG. 8 is calculated on the precondition that the ratio of the hoisting speed Vh of the hanging tool 8 to the transverse speed Vt of the hanging tool 8 is 1: 1. Yes. That is, it is a precondition that the hanging tool 8 moves to the land side while ascending at an angle (θ) of 45 degrees. Similarly, the rotation speed of the motor in the B2 operation of FIG. 8 is calculated on the precondition that the hanging tool 8 traverses to the sea side while descending at an angle (θ) of 45 degrees.

  As can be seen from FIG. 8, the outputs of the motor M1 and the motor M3 during the A3 operation have the highest values (200% each) among all the operations of the A1 operation to the B3 operation. This is because during the A3 operation, the land-side motors M1 and M3 wind the land-side wires W1 and W3 at the same speed as the hoisting speed Vh of the hanger 8, and at the same speed as the traverse speed Vt of the hanger 8. This is because the wires W1 and W3 must be wound up. On the other hand, the sea-side motors M2 and M4 wind the sea-side wires W2 and W4 at the same speed as the hoisting speed Vh of the hanger 8, and the sea-side wires W2 and W4 at the same speed as the traverse speed Vt of the hanger 8. Will be paid out. Since the precondition is that the hoisting speed Vh and the traverse speed Vt are equal, the sea side motors M2 and M4 are in a stopped state without performing the winding and feeding of the sea side wires W2 and W4.

Under the condition of the ratio of Vh and Vt described above, the outputs of the two seaside motors M2 and M4 that drive the two seaside drums D2 and D4, respectively, should be at most 100% as illustrated in FIG. It can be seen that this value is half of the maximum value (200%) of the outputs of the two land-side motors M1 and M3. That is, based on the above-described conditions, the operation of the trolley 7 and the hanging tool 8 can be performed without any trouble even if the total capacity of the sea-side motors M2 and M4 is half the total capacity of the land-side motors M1 and M3.

  Based on the above knowledge, in the present embodiment, the capacities of the motors M1 to M4 are determined by the following method.

  In the conventional quay crane, at the design stage, first, the maximum value of the weight of the load that can be lifted by the hanger 8, the maximum value of the speed at which the hanger 8 is lifted, the maximum value of the speed at which the trolley 7 is traversed is required. Is defined in advance as the ability to be performed. From this required capacity, the maximum load weight of the hanger 8 and the maximum value of the wire winding speed are calculated, and the maximum value of the output required for the motor is calculated therefrom. The motor capacity capable of realizing this output was determined from the maximum value of the required motor output. Hereinafter, this motor capacity may be referred to as a reference motor capacity.

  That is, the reference motor capacity is a motor capacity capable of outputting the power required when the trolley 7 is traversed to the land side at the upper limit speed while raising the hanging tool 8 at the maximum load at the upper limit speed. Conventionally, the capacities of the four motors installed on the quay crane were all determined according to the reference motor capacity.

  In the present invention, as in the prior art, first, the reference motor capacity is calculated from the capacity required for the quay crane and set in advance. Next, the capacities of the land-side motors M1 and M3 are set to 100% or more and 120% or less of a preset reference motor capacity. Preferably, the capacities of the land-side motors M1 and M3 are set to 100% or more and 105% or less of the reference motor capacity, and more preferably 100%. That is, each capacity | capacitance of the land side motors M1 and M3 is set to a motor capacity substantially the same as the conventional quayside crane if the capability of the quayside crane 1 requested | required is the same.

  Next, the ratio of the maximum value of the speed Vh for raising the hanger 8 and the maximum value of the transverse speed Vt to the land side is obtained. For example, when the ratio of the respective maximum values of the hoisting speed Vh and the traversing speed Vt is 1: 1, the hanging tool 8 traverses to the land side while ascending at an angle of 45 degrees during the A3 operation. .

  At this time, the wire winding speed Vr of the land side motors M1 and M3 can be expressed by Vh + Vt. The wire winding speed Vf of the sea side motors M2 and M4 can be expressed by Vh−Vt, and the value thereof is zero. That is, the outputs of the sea side motors M2 and M4 in the A3 operation are zero. The maximum output required for the sea-side motors M2 and M4 is the time of the A2 operation in which the lifting device 8 at the maximum loading is pulled straight up at the maximum speed, and the wire winding speed Vf = Vh of the sea-side motors M2 and M4. .

  From the above, the maximum value of the wire winding speed Vr of the land side motors M1 and M3 is Vh + Vt, the maximum value of the wire winding speed Vf of the sea side motors M2 and M4 is Vh, and the ratio is 2: 1. Since the ratio of the maximum output between the land-side motors M1, M3 and the sea-side motors M2, M4 is also 2: 1, the ratio between the capacity of each of the land-side motors M1, M3 and the capacity of each of the sea-side motors M2, M4 is 2: 1. That is, each capacity of the sea side motors M2 and M4 is determined to be half of each capacity of the land side motors M1 and M3.

  In order to prevent the hoisting speed Vh and the traverse speed Vt from exceeding the maximum values, a control device such as a limit switch is installed in an actual quay crane.

When the ratio of the maximum values of the hoisting speed Vh and the traversing speed Vt required at the design stage of the quay crane 1 is 1: 1.7, the hanging tool 8 is inclined at an angle of about 30 degrees during the A3 operation. Ascending and rampant to the land side. At this time, the wire winding speed Vr of the land-side motors M1 and M3 can be expressed by Vr = Vh + Vt, and the wire winding speed Vf of the sea-side motors M2 and M4 can be expressed by Vh−Vt.

  The maximum value of the wire winding speed Vr of the land side motors M1 and M3 is Vh + Vt at the time of A3 operation, and the maximum value of the wire winding speed Vf of the sea side motors M2 and M4 is Vh at the time of A2 operation. 7: 0.7. Since the ratio of the maximum output between the land-side motors M1 and M3 and the sea-side motors M2 and M4 is also 2.7: 0.7, each capacity of the land-side motors M1 and M3 and each capacity of the sea-side motors M2 and M4 The ratio can be 2.7: 0.7. That is, the capacities of the sea side motors M2 and M4 can be about 37% of the land side motors M1 and M3.

  Depending on the size of the quay crane 1, the size of the bulk carrier 20, the position of the installed hopper 9, and the like, the path (trajectory) to which the hanging tool 8 should move during loading is different. The maximum value of the hoisting speed Vh and the maximum value of the traversing speed Vt required at the design stage of the quay crane 1 are different depending on the shape of the path through which the hanging tool 8 can be efficiently moved. In either case, however, the capacities of the two sea-side motors M2 and M4 and the capacities of the two land-side motors M1 and M3 are set according to the ratio of the maximum value of the hoisting speed Vh and the maximum value of the traverse speed Vt. The ratio with the capacity can be set. Specifically, the capacities of the two sea-side motors M2 and M4 are set within a range of, for example, 30% to 70%, preferably 40% to 60% of the capacities of the two land-side motors M1 and M3. Can do.

  The method of determining the capacities of the four motors is not limited to the above, and the capacities of the two sea side motors M2 and M4 may be set smaller than the capacities of the two land side motors M1 and M3. . For example, a coefficient such as a safety factor may be set in advance, and the capacity of one of the land-side motors M1 and M3 may be multiplied by this coefficient to determine each capacity of the sea-side motors M2 and M4.

  The capacities of the two seaside motors M2 and M4 can be set in a range of 80% to 120% with respect to the other. Desirably, it is set in the range of 90% to 110%, and more desirably, the capacities of the two seaside motors M2 and M4 are made the same.

  Similarly, the capacities of the two land-side motors M1 and M3 can be set within a range of 80% to 120% with respect to the other. Desirably, it is set in the range of 90% to 110%, and more desirably, the capacities of the two land-side motors M1 and M3 are the same.

  Even if the capacities of the sea side motors M2 and M4 or the land side motors M1 and M3 are different, the sea side motors M2 and M4 are, for example, 30% or more with respect to the land side motors M1 and M3. The capacity is set in the range of 70% or less. That is, when the four motors M1 to M4 installed on the quay crane 1 are arranged in the order of the capacity, the motor with the smallest capacity and the motor with the next smallest capacity are always the sea side motors M2 and M4. .

  According to the quay crane 1 according to the present embodiment described above, the capacities of the sea-side motors M2 and M4 are set to be smaller than the capacities of the land-side motors M1 and M3, and the land-side motors M1 and M3 Since each capacity is set to 100% or more and 120% or less of a preset reference motor capacity, the total of the four motors M1 to M4 is prevented while preventing troubles in the operation of the trolley 7 and the hanging tool 8. The capacity can be reduced. Thereby, since a motor cost can be reduced, the reduction of the cost of the quay crane 1 can be aimed at.

When the specific gravity of the bulk load is relatively large, or when the bulk load is a mud with a high viscosity, the work amount when closing the grab bucket may become very large. In this case, the preset reference motor capacity is relatively large.

  As illustrated in FIG. 8, in the A1 operation when closing the grab bucket, only the opening / closing motors M3 and M4 work, and the support motors M1 and M2 do not work.

  Therefore, when the capacities of the two land-side motors M1 and M3 are different, it is desirable to set the capacity of the land-side support motor M1 smaller than the land-side opening / closing motor M3. Similarly, when the capacities of the sea side motors M2 and M4 are different, it is desirable to set the capacity of the sea side support motor M2 smaller than the sea side opening / closing motor M4.

  That is, when the capacities of the four motors M1 to M4 installed in the quay crane 1 are arranged in order of size, the sea side motor M2 of the sea side support drum D2 is the smallest, and the sea side motor M4 of the sea side opening / closing drum D4. The capacity increases in the order of the land-side motor M1 of the land-side support drum D1 and the land-side motor M3 of the land-side opening / closing drum D3.

  Depending on the nature of the bulk cargo to be handled, the outputs of the open / close motors M3 and M4 in the A1 operation when closing the grab bucket may be the largest. That is, there is a possibility that the outputs of the open / close motors M3 and M4 exceed 200% that is the output in the A3 operation.

  In such a case, as the quay crane 1 of the second aspect of the present invention, the capacities of the two open / close motors M3 and M4 are set smaller than the capacities of the two support motors M1 and M2, and the land-side motors M1 and M3 are set. It is good also as a structure which does not consider the capacity | capacitance of mutual and the sea side motors M2 and M4. In the second aspect of the present invention, the capacities of the two support motors M1 and M2 are set to, for example, 30% to 70% of the capacities of the two open / close motors M3 and M4.

  Moreover, the capacity | capacitance of two support motors M1 and M2 can set the other to the range of 80% or more and 120% or less with respect to one. The capacities of the two support motors M1 and M2 may be the same.

  Similarly, the capacities of the two open / close motors M3 and M4 can be set within a range of 80% to 120% with respect to the other. The capacities of the two open / close motors M3 and M4 may be the same.

  By setting the capacities of the support motors M1 and M2 to be smaller than the open / close motors M3 and M4, the total capacity of the four motors M1 to M4 can be reduced.

  When the quay crane 1 of the first or second aspect of the present invention is controlled by the semi-automatic operation or the automatic operation to lift the hanger 8 and to move the trolley 7, the hoisting speed Vh of the hanger 8 at the time of A3 operation, for example, The traversing speed Vt of the trolley 7 can be accurately set in advance.

  When the quay crane 1 is operated by an operator, the balance in which the hoisting speed Vh and the traverse speed Vt are output differs depending on the operator, and the quay crane 1 is designed so that the cargo can be handled even if each reaches the maximum value. . However, in the case of automatic operation or the like, a balance for outputting the hoisting speed Vh and the traverse speed Vt can be set in advance and fixed to that balance, which is advantageous for further reducing the capacity of each motor M1 to M4.

According to the present invention, since the total capacity of the motors M1 to M4 can be reduced, the motor weight can also be reduced. The total weight of the four motors of the same capacity installed in the conventional quay crane was, for example, about 200 kg to 400 kg, which was a considerable weight. In the quay crane 1 of this invention, since a motor can be reduced in size and the total weight of a motor can be reduced, it is advantageous in reducing the weight of the quay crane 1 whole.

  Moreover, since these motors M1 to M4 are installed at a height of about 50 to 80 m above the ground, it is advantageous to improve the stability of the quay crane 1 by reducing the total weight of the motors M1 to M4. . In addition, other structural materials that support the motors M1 to M4 can be reduced in weight. Also in this respect, the weight of the entire quay crane 1 can be significantly reduced. As a result, the quay crane 1 as a whole has the advantage of significant weight reduction and cost reduction. Furthermore, it contributes to the seismic resistance of the quay crane 1 and the reduction of energy consumption during travel.

  Furthermore, according to the determination method of the motor capacity of the quay crane 1 according to the present embodiment, the motor capacity can be determined based on the actual use conditions of the quay crane 1, and therefore, an appropriate motor capacity that is not excessive or insufficient in practical use. The quay crane 1 provided with can be provided.

  In addition, in this embodiment mentioned above, although the rope trolley type unloader is used as an example of the quay crane 1, the kind of quay crane to which this invention is applied is not limited to this, For example, hanging tools, such as a spreader It is also possible to apply to a quay crane having 8 or the like.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

DESCRIPTION OF SYMBOLS 1 Quay crane 2 Traveling device 3 Leg structure 4 Girder 5 Boom 6 Girder 7 Trolley 8 Lifting tool 9 Hopper 10 Machine room 11 Controller 12 CPU
13 ROM
14 RAM
20 Bulk carrier 21 Transported goods D1 Land side support drum D2 Sea side support drum D3 Land side open / close drum D4 Sea side open / close drum M1 Land side support motor M2 Sea side support motor M3 Land side open / close motor M4 Sea side open / close motor W1 Land side support Wire W2 Sea side support wire W3 Land side opening / closing wire W4 Sea side opening / closing wires P1 to P8 pulley Vf (sea side) wire winding speed Vr (land side) wire winding speed Vh winding speed Vt transverse speed

Claims (7)

Two sea side drums arranged on the sea side, two land side drums arranged on the land side, two sea side motors respectively driving the two sea side drums, and two land side drums Two land-side motors that drive each, a trolley that can be traversed above the girder, a suspension that is arranged under the trolley, and two sea-side drums to the sea-side end of the girder And two sea-side wires respectively connected to the suspension via the trolley, and two land-side drums from the land-side end of the beam and the trolley to the suspension. In a quay crane comprising two land-side wires connected,
The capacities of the two sea-side motors are set smaller than the capacities of the two land-side motors, and the capacities of the two land-side motors are not less than 100% of a preset reference motor capacity. A quay crane characterized in that it is set to less than%.   2. The quay crane according to claim 1, wherein the capacities of the two sea-side motors are set to 30% or more and 70% or less of the capacities of the two land-side motors.   The quay crane according to claim 1 or 2, wherein a capacity of one sea side motor is set to 80% or more and 120% or less with respect to a capacity of the other sea side motor.   The quay crane according to any one of claims 1 to 3, wherein a capacity of one of the land side motors is set to 80% or more and 120% or less with respect to a capacity of the other land side motor. A sea-side opening / closing drum arranged on the sea side and wound with a sea-side opening / closing wire, a land-side opening / closing drum arranged on the land side and wrapped with a land-side opening / closing wire, and a sea-side supporting wire arranged on the sea side A sea-side support drum to be wound, a land-side support drum disposed on the land side and wound with a land-side support wire, and two opening / closing motors for driving the sea-side opening / closing drum and the land-side opening / closing drum, respectively A suspension motor composed of two support motors for driving the sea side support drum and the land side support drum, a trolley arranged to traverse along the beam, and a grab bucket arranged below the trolley. With tools,
In the quay crane provided with an opening / closing part to which the grab bucket connects the sea side opening / closing wire and the land side opening / closing wire, and a support part to which the sea side support wire and the land side support wire are connected,
The capacities of the two support motors are set to be smaller than the capacities of the two opening / closing motors, and the capacities of the two opening / closing motors are 100% or more and 120% or less of a preset reference motor capacity. Quay crane characterized by being set.   The quay crane according to claim 5, wherein each capacity of the two support motors is set to 30% or more and 70% or less of each capacity of the two opening / closing motors. Two sea side drums arranged on the sea side, two land side drums arranged on the land side, two sea side motors respectively driving the two sea side drums, and two land side drums Two land-side motors that drive each, a trolley that can be traversed above the girder, a suspension that is arranged under the trolley, and two sea-side drums to the sea-side end of the girder And two sea-side wires respectively connected to the suspension via the trolley, and two land-side drums from the land-side end of the beam and the trolley to the suspension. A method for determining a motor capacity of a quay crane comprising two land-side wires connected to each other,
In the range where each capacity | capacitance of two said sea side motors becomes smaller than each capacity | capacitance of two said land side motors, the hoisting speed and traversing speed of the said hoisting device at the time of traversing to the land side while the said hoisting device is wound up, A method for determining a motor capacity of a quay crane, wherein a ratio between each capacity of the two sea side motors and each capacity of the two land side motors is determined based on the ratio.

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