Electric hoisting machine and crane system

Abstract

We provide an electric hoisting machine equipped with a hanger that reduces the load on the press machine during manufacturing. [Solution] An electric hoist having a hanger for holding a rotating sheave, the hanger being supported by a hanger pin and rotatably holding the sheave pin, and the hanger being supported by the hanger pin in holes in two parallel-arranged flat plates.

Description

Technical Field

[0001] The present invention relates to an electric hoist and a crane system.

Background Art

[0002] Patent Document 1 is known as the background art in this technical field.

[0003] Patent Document 1 discloses, in FIGS. 1 and paragraph 0015, a structure in which a hanger formed by bending a plate-like member into a U-shape is rotatably suspended from a shaft.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the structure described in Patent Document 1, it is necessary to manufacture a hanger for holding a sheave by bending a thick steel plate with a press machine into a U-shape. Since the angle of bending with the press machine is large, the load on the press machine increases, leading to a failure of the press machine. There is also a problem that the manufacturing takes time. <00,00030> Therefore, an object of the present invention is to provide an electric hoist and a crane system provided with a hanger that reduces the load on the press machine and can be manufactured.

Means for Solving the Problems

[0007] An example for solving the above problems is as follows. <0000,037>

[0008] An electric hoist having a hanger for holding a rotating sheave, the hanger being supported by a hanger pin and rotatably holding the sheave pin, and the hanger being supported by the hanger pin in a hole in two parallel-arranged flat plates. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an electric hoisting machine and crane system equipped with a hanger that reduces the load on the press machine and enables manufacturing.

[0010] Further aspects of the present invention and its effects will become clear throughout the entire specification below. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram of an electric hoisting machine. [Figure 2] This is an explanatory diagram of the hanger section of the comparative example. [Figure 3] This is an explanatory diagram of the hanger section in the comparative example. [Figure 4A] This is an explanatory diagram of the hanger section in one embodiment. [Figure 4B] This is an explanatory diagram of the hanger section in one embodiment. [Figure 5A] This is an explanatory diagram of the hanger section in one embodiment. [Figure 5B] This is an explanatory diagram of the hanger section in one embodiment. [Figure 5C] This is an explanatory diagram of the hanger section in one embodiment. [Figure 5D] This is an explanatory diagram of the hanger section in one embodiment. [Figure 6A] This is an explanatory diagram of the hanger section in one embodiment. [Figure 6B] This is an explanatory diagram of the hanger section in one embodiment. [Figure 7] This is an explanatory diagram of the hanger section in another embodiment. [Figure 8A] This is an explanatory diagram of the hanger section in another embodiment, and corresponds to Figure 5C. [Figure 8B]It is an explanatory diagram of the hanger part in another embodiment and corresponds to FIG. 5C. [Figure 8C] It is an explanatory diagram of the hanger part in another embodiment and corresponds to FIG. 5C. [Figure 9] It is a crane system configuration diagram.

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings as necessary.

Embodiment

[0013] First, the electric hoist will be described with reference to FIG. 1.

[0014] The electric hoist 52 includes an electric motor 51 that serves as a drive source for winding up and lowering a suspended load, a drum 50 for winding a rope 55 for suspending the suspended load, a speed reduction unit 53 for reducing the rotation of the electric motor 51, and a brake device 54 for braking the electric motor 51.

[0015] The rotation of the electric motor 51 is transmitted to the drum 50 via the speed reduction unit 53. When the drum 50 rotates, the rope 55 wound around the drum 50 moves up and down, and the suspended load can be lifted and lowered. A load block 56 for suspending a load is attached to the rope 55 wound around the drum 50.

[0016] Both ends of the rope 55 held by the drum 50 are fixed inside the drum 50, but the bent portion where the rope 55 is folded back is held by a rotating sheave 57 shown in FIG. 2. The rotating sheave 57 is fixed to a hanger 58 with a sheave pin 59. The hanger 58 is fixed to the frame 61 in a state of hanging on a hanger pin 60.

[0017] In the structure of the hanger 58, for example in Patent Document 1, it is generally made by using steel plate as the material and bending it by applying external force with a press machine. When bending the hanger 58 with a press machine, the part held by the hanger pin 60 becomes the point of force application, and it is bent by applying external force. However, because it is held so as to cover the rotating sheave 57, the stroke to the point of force application becomes long, which presents a manufacturing challenge as it increases the load on the press machine.

[0018] Figure 3 shows a comparative example of a hanger structure. It corresponds to the structure disclosed in Patent Document 1. It has a hanger 58 that is bent in a semicircular shape relative to a hanger pin 60.

[0019] This structure presents a challenge: when it is manufactured by bending it with a press machine, it places a heavy burden on the press machine, resulting in a high manufacturing load.

[0020] Furthermore, there is another challenge in the bending process of the hanger 58, which requires high precision. If it is not a perfect semicircle, or if there are localized variations in the curvature of the bend, localized stress will occur between the hanger pin 60 and the hanger, resulting in a reduction in the crane's practical load-bearing capacity. Therefore, high-precision manufacturing is required, which leads to increased process time and lower productivity.

[0021] Furthermore, if the shape is not a perfect semicircle, friction and contact resistance between the hanger pin 60 and the crane increase during crane operation, leading to wear on the crane. Also, since the hanger 58 contacts the hanger pin 60 over a wide area in the depth direction of the paper in the diagram, the contact area is large and the contact resistance is high. As a result, the sway of the suspended object deviates from the calculated value, and when moving the load in a parallel direction while suspended, the load does not sway as calculated, necessitating a reduction in the movement speed for safety reasons.

[0022] Figure 4A is a schematic diagram illustrating the hanger section in this embodiment. It has two side plates 102, which are arranged parallel to each other at a distance. Each of the two side plates is provided with a hanger pin hole 66. By passing a hanger pin through the hanger pin hole 66 between the two side plates 102, the hanger function shown in Figure 3 is achieved.

[0023] The key feature of this structure is that the hanger 58 is constructed using a flat plate and a hole. As a result, the high-precision bending using a press machine, which was essential in Figure 3, becomes unnecessary, and the manufacturing challenge of press machine load can be eliminated in principle.

[0024] Furthermore, since the holes can be easily formed by NC-controlled laser cutting, high-precision holes can be easily formed in a short time, resulting in processing that excels in both accuracy and productivity.

[0025] Furthermore, the contact area between the hanger pin 60 and the hanger can be reduced to only the thickness of the two side plates. As a result, the contact area can be reduced to a fraction of a tenth or even a few hundredths of its original size. This makes it possible to implement oscillation control according to calculated values, enabling the realization of a crane device with a high load movement speed.

[0026] Figure 4B shows another side plate that constitutes the hanger 58, which is suitable for use in combination with Figure 4A. The side plate 100 in Figure 4B is positioned orthogonally to the side plate 102 in Figure 4A and is composed of two flat plates. Like the side plate 102, the side plate 100 is composed of a flat plate and a hole, and a sheave pin hole 65 is provided in the side plate 100. The hanger is formed by passing a sheave pin 59 through this sheave pin hole 65. The structure of Figure 4B can achieve the same manufacturing method and effects as those described for Figure 5A. By combining both structures, a hanger with higher productivity and precision can be realized.

[0027] Figure 5A shows the side plate 102 of Figure 4A, formed by welding the top plate 101 to the side plate 101 at the weld joint 200. This allows for high-precision horizontal alignment between the two side plates 102. Furthermore, since the thickness of the side plate 102 is only a few millimeters to about 15 mm, and at most about 20 mm, the entire thickness can be welded, enabling high strength.

[0028] Figure 5B shows the side plate 100 of Figure 4B, formed by welding the top plate 101 to the side plate 101 at the weld joint 200. This allows for high-precision horizontal alignment between the two side plates 101. Furthermore, since the thickness of the side plate 100 is only a few millimeters to about 15 mm, and at most about 20 mm, the entire thickness can be welded, enabling the achievement of high strength.

[0029] Figure 5C shows the arrangement of side plates 100 and 102. The two side plates 102 and the two side plates 100 are arranged to form a rectangle. Although this rectangle is shown as a square in the figure, it may be rectangular depending on the crane design.

[0030] Side plates 102 and 100 are arranged orthogonally. The gap between side plate 102 and side plate 100 is welded at the necessary locations using weld joints 201. This results in a highly accurate, high-strength, and productive structure.

[0031] After forming the rectangle as shown in Figure 5C, the top plate 101 is placed on top, and a welded section 200 is formed as shown in Figure 5A or Figure 5B, thereby achieving an even stronger structure.

[0032] Furthermore, the top plate 101 can be provided with holes for suspension or other purposes as needed. In that case, the top plate 101 with the necessary holes already made will be welded to it.

[0033] The welding of the side plate 100 and the side plate 102 may be performed by creating a weld joint 201 in the longer portion of the side plate, as shown in Figure 6A.

[0034] Alternatively, as shown in Figure 6B, the weld may be divided into weld section 201 and weld section 202, avoiding the hole. Or, only one of the weld sections 201 or 202 may be welded. This is to avoid the heat generated during welding affecting the shape of the hole, especially when the thickness of the side plate is thin. [Examples]

[0035] The differences between this embodiment and Embodiment 1 will be explained below.

[0036] Figure 8A is a diagram corresponding to Figure 5C. In this embodiment, instead of the two side plates 100 and 102 in Figure 5C, a rectangular shape is formed by a combination of two side plates 103.

[0037] The side panel 103 has a bent portion 150. At this bent portion 150, it is bent so that there are two sides in a perpendicular direction. This bent section does not contribute to contact with or support from other components. Therefore, the precision required for bending as shown in Figure 3 is unnecessary, and manufacturing is easier. The only requirement is that two sides are perpendicular to each other. A sheave pin hole 65 is formed on one of the two sides, and a hanger pin hole 66 is formed on the other. By forming these sheave pin holes 65 and hanger pin holes 66 by laser cutting before bending, productivity can be improved.

[0038] As shown in Figure 8C, the two side plates 103 are combined and welded together with a weld joint 203 between them. This creates a rectangular, integrated structure.

[0039] Figure 8B shows an example where the folded portion 150 is constructed with a curved fold. Even with a curved fold, as long as two sides are perpendicular, the manufacturing burden is light.

[0040] Figure 7 shows three views of an example of this embodiment. The top view is a top perspective view, the left view is a side perspective view of one side, and the right view is a side perspective view of the other side.

[0041] In this embodiment, the effects of Example 1 can be achieved. Furthermore, the welding time can be reduced. [Examples]

[0042] This embodiment is a diagram of the crane system configuration of a crane device using the hanger of Embodiment 1 or Embodiment 2. 300 is the crane device, 301 is the horizontal movement device, 302 is the hoisting machine or vertical movement device, 310 is the control device, 311 is the computing device, 312 is the command reception unit, 313 is the memory device, 320 is the command device, 330 is the weight sensor, 350 is the movement command, 351 is the movement amount instruction, 352 is the data reference, 361 is the horizontal movement instruction, 362 is the hoisting instruction, 363 is the load data, and 400 is the transported object.

[0043] The computing unit 311 performs motion calculations based on the data in the storage device 313. The command device 320, which may be a dedicated terminal or an application on a general-purpose device such as a smartphone, instructs the command reception unit 312 to move the transported object 400 via wired or wireless connection. The computing unit 311 also refers to the load data 363 of the transported object 400, calculates the motion, and instructs the crane device 300 to move at a safe and high speed as either a horizontal movement instruction 361 or a hoisting instruction 362, or both.

[0044] In this embodiment, by using a crane device that utilizes the hanger of either Embodiment 1 or Embodiment 2, a crane system that enables faster and safer crane movement can be realized.

[0045] Furthermore, if the oscillation calculation determines that the amount of oscillation exceeds a specified value, the movement speed, the hoisting speed, or both can be modified to ensure safer crane operation.

[0046] As long as the ideas and concepts disclosed in the above descriptions are used, any modifications or similar examples thereof are also included within the scope of the present invention.

[0047] Furthermore, an example of the present invention described using the above embodiments can also be expressed as follows.

[0048] <Part 1> It has a hanger that holds the swivel sheave, The hanger is supported by a hanger pin and rotatably holds a sheave pin. The hanger is supported by the hanger pins in holes in two parallel-arranged flat plates. <Part 2> An electric hoisting machine according to <Part 1>, having two parallel-arranged flat plates, wherein the sheave pin is rotatably held in a hole in the two parallel-arranged flat plates. <Part 3> The electric hoisting machine according to <Part 2>, further comprising another flat plate positioned above the aforementioned flat plate, and having a welded joint between the two parallel-arranged flat plates and the other flat plate. <Part 4> The electric hoisting machine according to <3>, having a welded joint between the two parallel-arranged flat plates. <Part 5> The electric hoisting machine according to <Part 3>, wherein the two parallel-arranged flat plates each have a bent portion, and each flat plate has both a hole for passing the hanger pin and a hole for passing the sheave pin. <Part 6> The electric hoisting machine according to <5>, wherein the two flat plates have two perpendicular sides at the front and rear of the bent portion. <Part 7> The electric hoisting machine described in <4> has welded portions above and below the hole. <Part 8> It has a crane device and a control device, The control device controls the crane device based on instructions from the command device. The crane device has a hanger for holding a rotating sheave, The hanger is supported by a hanger pin and rotatably holds a sheave pin. The hanger is a crane system in which the hanger is supported by the hanger pin in a hole in two parallel-arranged flat plates. <Part 9> The crane system according to <No. 8>, comprising two parallel-arranged flat plates, wherein the sheave pin is rotatably held in a hole in the two parallel-arranged flat plates. <Part 10> The crane system according to <9>, further comprising another flat plate positioned above the aforementioned flat plate, and having a welded joint between the two parallel flat plates and the other flat plate. <Part 11> The crane system according to <10>, having a welded joint between the two parallel-arranged flat plates. <Part 12> The crane system according to <10>, wherein the two parallel-arranged flat plates each have a bent portion, and each flat plate has both a hole for passing the hanger pin and a hole for passing the sheave pin. <Part 13> The crane system according to <12>, wherein the two flat plates have two perpendicular sides at the front and rear of the bent portion. <Part 14> The crane system according to <11>, wherein the welded portion has welded portions above and below the hole. <Part 15> The crane system according to any one of items <8> to <14>, wherein the crane device has a weight sensor, and the control device performs motion calculations based on load data from the weight sensor and instructions from the command device. <Part 16> [Explanation of symbols]

[0049] 50: Drums 51: Electric motor 52: Electric hoist 53: Reduction section 54: Brake system 55: Rope 56: Roadblock 57: Rotating Sheave 58: Hanger 59: Sheave pin 60: Hanger pins 61: Frame 65: Sheave pin hole 66: Hanger pin hole 100, 102, 103: Side panels 101: Upper board 150: Folding part 200, 201, 202, 203: Welded section 300: Crane equipment 301: Horizontal movement device 302: Hoisting machine or vertical movement device 310: Control device 311: Arithmetic device 312: Command Reception Department 313: Storage device 320: Command device 330: Weight sensor 350: Movement command 351: Movement amount instruction 352: Data Reference 361: Horizontal movement instruction 362: Winding instruction 363: Load Data 400: Transported goods

Claims

1. It has a hanger that holds the swivel sheave, The hanger is supported by a hanger pin and rotatably holds a sheave pin. The hanger is an electric hoisting machine in which the hanger is supported by the hanger pin in a hole in two parallel-arranged flat plates.

2. The electric hoisting machine according to claim 1, having two parallel-arranged flat plates, wherein the sheave pin is rotatably held in a hole in the two parallel-arranged flat plates.

3. The electric hoisting machine according to claim 2, further comprising another flat plate positioned above the aforementioned flat plate, and having a welded portion between the two parallel-arranged flat plates and the other flat plate.

4. The electric hoisting machine according to claim 3, having a welded joint between the two parallel-arranged flat plates.

5. The electric hoisting machine according to claim 3, wherein the two parallel-arranged flat plates each have a bent portion, and each flat plate has both a hole for passing the hanger pin and a hole for passing the sheave pin.

6. The electric hoisting machine according to claim 5, wherein the two flat plates have two perpendicular sides before and after the bent portion.

7. The electric hoisting machine according to claim 4, wherein the welded portion has welded portions above and below the hole portion.

8. It has a crane device and a control device, The control device controls the crane device based on instructions from the command device. The crane device has a hanger for holding a rotating sheave, The hanger is supported by a hanger pin and rotatably holds a sheave pin. The hanger is a crane system in which the hanger is supported by the hanger pin in a hole in two parallel-arranged flat plates.

9. The crane system according to claim 8, comprising two parallel-arranged flat plates, wherein the sheave pin is rotatably held in a hole in the two parallel-arranged flat plates.

10. The crane system according to claim 9, further comprising another flat plate positioned above the aforementioned flat plate, and having a welded joint between the two parallel flat plates and the other flat plate.

11. The crane system according to claim 10, further comprising a welded joint between the two parallel-arranged flat plates.

12. The crane system according to claim 10, wherein the two parallel-arranged flat plates each have a bent portion, and each flat plate has both a hole for passing the hanger pin and a hole for passing the sheave pin.

13. The crane system according to claim 12, wherein the two flat plates have two perpendicular sides before and after the bent portion.

14. The crane system according to claim 11, wherein the welded portion has welded portions above and below the hole.

15. The crane system according to any one of claims 8 to 14, wherein the crane device has a weight sensor, and the control device performs motion calculations based on load data from the weight sensor and instructions from the command device.

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