Load blocks and electric hoists

Abstract

To provide a load block and an electric hoisting machine capable of improving workability for inspection, replacement or the like of the load block.SOLUTION: The load block suspending a lifted load and vertically moved by a wire rope 13 wound on a drum comprises: a hook for suspending the lifted load; a trunnion that supports the hook; and a load block sheave 33 provided with a rope groove 35 that is rotatably fitted to a shaft of the trunnion and that hooks the wire rope on the outer periphery. The load block sheave 33 is provided with an abrasion identification groove 36 on the bottom of the rope groove 35 in a peripheral direction. A coloring member 37 for coloring the wire rope through contact is provided in a place of a depth equal to or higher than an abrasion limit value L of the abrasion identification groove 36.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a load block and an electric hoist for use in a crane apparatus, and more particularly to a load block and an electric hoist that enable easy determination of wear on a load block sheave of the load block. [Background technology]

[0002] A crane device is installed in a building such as a factory. The crane device is equipped with a hoist for lifting heavy objects, and this hoist runs along a rail laid along the ceiling of the building. The crane device is equipped with a travel motor, and the crane device moves along the rail by driving this travel motor. For example, Patent Document 1 discloses such a crane device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 63-262395 Summary of the Invention [Problem to be solved by the invention]

[0004] The wire rope passing through the load block rotates the load block sheave attached to the load block, moving it around the center of the load block. The load block sheave wears out due to contact with the wire rope, so periodic inspection, replacement, and other maintenance work is required. However, inspection of the load block sheave involves measuring the diameter of the groove, which cannot be measured without removing the load block from the wire rope, and when the load block is heavy, the maintenance work is cumbersome.

[0005] In the hoist described in Patent Document 1, no consideration is given to the ease of inspecting and replacing the load block sheaves for wear.

[0006] An object of the present invention is to provide a load block and an electric hoist that solves the above problems and improves the ease of inspection, replacement, and other operations of the load block. [Means for solving the problem]

[0007] To achieve the above object, an example of the "road block" of the present invention is as follows: A load block that suspends a load and moves up and down by a wire rope wound around a drum, comprising: a hook for suspending the load; a trunnion for supporting the hook; and a load block sheave that is rotatably attached to the axis of the trunnion and has a rope groove on its outer periphery for hanging the wire rope, wherein the load block sheave has a circumferential wear identification groove at the bottom of the rope groove, and a coloring member that colors the wire rope by coming into contact with the wear identification groove at a depth equal to or greater than the wear limit value.

[0008] Also, an example of the "electric hoist" of the present invention is as follows: An electric hoisting machine comprising a hoisting motor, a drum driven by the hoisting motor, a wire rope wound around the drum, and a load block attached to the wire rope and suspending a load, wherein the load block moves up and down by the wire rope as the drum rotates, wherein the load block comprises a hook for suspending the load, a trunnion supporting the hook, and a load block sheave rotatably attached to the axis of the trunnion and having a rope groove on its outer periphery for hanging the wire rope, wherein the load block sheave has a wear identification groove in the circumferential direction at the bottom of the rope groove, and a coloring member is provided at a location at a depth of the wear identification groove equal to or greater than the wear limit value, which colors the wire rope by coming into contact with the wear identification groove. Effect of the Invention

[0009] According to the present invention, when the load block sheave reaches its wear limit, the colored material is scraped off, leaving a colored mark on the wire rope, making it easy to recognize that the load block sheave has reached its wear limit and improving the ease of work such as inspecting and replacing the load block.

[0010] Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is an overall perspective view of the crane system. [Diagram 2] 1 is a cross-sectional view of an electric hoist according to an embodiment of the present invention, taken along a rotation axis direction. [Diagram 3] FIG. 2 is a right side view of the electric hoist according to the embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of a load block according to an embodiment of the present invention. [Figure 5A] FIG. 1 is a side cross-sectional view of a rope groove of a load block sheave. [Figure 5B] FIG. 11 is a side cross-sectional view of a rope groove of a modified load block sheave. [Figure 5C] FIG. 11 is a side cross-sectional view of a rope groove of a load block sheave of another modified example. [Figure 6] FIG. 2 is an enlarged cross-sectional view of a rope groove of a load block sheave according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the load block and electric hoist according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and applications within the technical concept of the present invention are also included in the scope of the present invention. In each drawing for explaining the embodiments, the same components are denoted by the same names and symbols as much as possible, and repeated explanations are omitted.

[0013] First, an overview of a crane system equipped with an electric hoist commonly called an electric hoist will be described with reference to Figure 1. Figure 1 is an overall perspective view of the crane system.

[0014] The crane girder 110 is placed on traveling rails 111 that are placed in parallel. Traveling parts 112 provided on both ends of the crane girder 110 are placed and supported on the traveling rails 111, and the crane girder 110 is carried by the rotation of wheels 113 provided on the traveling parts 112, and moves back and forth on the traveling rails 111. The wheels 113 are driven by a traveling motor 114.

[0015] The crane girder 110 supports a traverse frame 115 that moves laterally. This traverse frame 115 is equipped with a drum 14 around which a wire rope 13 is wound, and a hoisting motor 12 that drives the drum 14. A load block 17 equipped with a hook for suspending a load moves up and down by the wire rope 13. The traverse frame 115 moves left and right on the crane girder 110 by the rotation of wheels (driving wheels 117, driven wheels 118) provided on the traverse frame 115. The driving wheels 117 are driven by a traverse motor 119.

[0016] In this embodiment, the unit in which the hoisting motor 12 and the drum 14 are assembled within the traverse frame 115, the wire rope 13 and the load block 17 are referred to as an electric hoist.

[0017] Next, the configuration of the electric hoist will be described with reference to Figures 2 and 3. Figure 2 is a cross-sectional view of the electric hoist according to the embodiment of the present invention cut in the direction of the rotation axis, and Figure 3 is a right side view in Figure 2. Note that the load block 17 is not shown in Figure 2.

[0018] In Figures 2 and 3, the electric hoisting machine 11 is equipped with a hoisting motor 12 which serves as a drive source for hoisting and lowering a load, a drum 14 for winding a wire rope 13 for hoisting the load, a hoisting reduction section 15 for reducing the rotation of the hoisting motor 12, and a hoisting brake device 16 for braking the hoisting motor 12.

[0019] The rotation of the hoisting motor 12 is transmitted to the drum 14 via a hoisting reduction unit 15, and as the drum 14 rotates, the wire rope 13 wound around the drum 14 moves up and down, making it possible to raise and lower a suspended load. A load block 17 for suspending a load is attached to the wire rope 13 wound around the drum 14. In addition, the electric hoisting machine 11 is attached to a traverse device 18 in order to move the suspended load horizontally.

[0020] 1, the traverse device 18 includes a traverse motor 119 serving as a drive source for traverse of the electric hoist 11, a traverse frame 115 supporting the traverse motor 119, a traverse reduction unit (not shown) for reducing the rotation speed of the traverse motor 119, and a traverse brake device (not shown) for braking the traverse motor 119. The rotational force of the traverse motor 119 is transmitted to a driving wheel 117 via the traverse reduction unit, and the driving wheel 117 and the driven wheel 118 rotate to move on the crane girder 110, allowing the electric hoist 11 to traverse left and right.

[0021] Next, the load block 17 of this embodiment will be described with reference to Figures 4, 5, and 6. Figure 4 shows the load block 17 according to this embodiment, with the right side being a cross-sectional view. Figure 5 is a side cross-sectional view of the rope groove of the load block sheave. Also, Figure 6 is a partially enlarged cross-sectional view of the rope groove of the load block sheave 33.

[0022] The load block 17 includes a hook 31 for hanging a slinging wire rope or the like attached to a load, a trunnion 32 for supporting the hook 31, a load block sheave 33 rotatably attached to the axis of the trunnion 32, and a sheave cover 34 for covering the load block sheave 33. In Fig. 4, the load block sheave 33 and the sheave cover 34 are provided on both sides of the hook 31. The load block sheave 33 includes a rope groove 35 on its outer periphery for hanging the wire rope 13 wound around the drum 14. As shown in Fig. 6, a wear identification groove 36 is provided at the bottom of the rope groove 35 of the load block sheave 33, and a coloring member 37 is attached to the bottom of the wear identification groove 36, which colors the wire rope 13 when the rope groove 35 reaches its wear limit (wear limit value L in the figure). The wear identification groove 36 may be provided around the entire circumference of the rope groove 35 as shown in Fig. 5A, or may be provided only on a part of the circumference. In the modified example of Fig. 5B, the wear identification groove 36 and the coloring member 37 are provided on 1 / 4 of the entire circumference of the rope groove 35. In the modified example of Fig. 5C, the wear identification groove 36 and the coloring member 37 are provided at two locations facing each other over 1 / 4 of the entire circumference of the rope groove 35, but they may be further divided and provided at multiple locations. The coloring member 37 may be any material that comes into contact with the wire rope 13 to color the wire rope 13, and may be, for example, a chalk material of a color different from the color of the wire rope. If the coloring member 37 is made of a material that can be wiped off the wire rope 13 when it adheres to the wire rope 13, replacement of the wire rope is not required, but if the coloring member 37 is made of a material such as a solid pigment that does not disappear when it adheres to the wire rope 13, replacement of the wire rope 13 together with the load block sheave 33 is required.

[0023] Next, a method for checking the wear of the load block sheave 33 will be described with reference to FIG.

[0024] The colored member 37 attached to the wear identification groove 36 of the rope groove 35 is provided to the same height as the wear limit of the load block sheave 33 when viewed from the circumferential direction, and is scraped off when the wear of the rope groove 35 of the load block sheave 33 reaches the wear limit (wear limit value L). When the colored member 37 comes into contact with the wire rope 34, it colors the wire rope 34, allowing a user or inspector to recognize that the wear limit has been reached without measuring the diameter of the load block sheave 33.

[0025] When a load is hoisted, the load block sheave 33 is significantly affected by the load. Therefore, checking the wear of the load block sheave 33 was an important item. However, the only means for inspecting the amount of wear of the load block sheave 33 was to measure the diameter of the load block sheave 33, which could lead to measurement errors. In addition, due to the structure of the load block 17, in order to measure the diameter of the load block sheave 33, it was necessary to remove the sheave cover 34 and the wire rope 13 from the load block 17, making the measurement cumbersome.

[0026] In order to solve this problem, in this embodiment, a colored member 37 is attached to the bottom of the rope groove 35 of the load block sheave 33, so that it is possible to easily recognize that the load block sheave 33 has reached its wear limit without measuring the diameter of the load block sheave 33, thereby improving the ease of maintenance work.

[0027] The present invention is not limited to the above-described embodiment, but includes various modified examples. The above-described embodiment has been described in detail to easily explain the present invention, and the present invention is not necessarily limited to the embodiment having all of the configurations described. [Explanation of symbols]

[0028] 11...Electric hoist 12...Winding motor 13...Wire rope 14...Drums 15...Hoisting reduction section 16...Hoisting brake device 17…Road Block 18...Traversing device 31…Hook 32…Trunion 33...Road block sheave 34…Sheave cover 35…Rope groove 36…Wear detection groove 37…Colored material

Claims

1. A load block that suspends a load and moves up and down by a wire rope wound around a drum, A hook for hanging a load, A trunnion supporting the hook; a load block sheave that is rotatably attached to the axis of the trunnion and has a rope groove on its outer periphery for winding the wire rope; Equipped with The load block sheave is provided with a wear identification groove in a circumferential direction at the bottom of the rope groove, A load block characterized in that a coloring member is provided at a location of the wear detection groove at a depth equal to or greater than the wear limit value, the coloring member coloring the wire rope upon contact therewith.

2. 2. The load block of claim 1, A load block characterized in that the wire rope comes into contact with the colored member and is colored, thereby making it possible to recognize that the load block sheave has reached its wear limit.

3. 2. The load block of claim 1, A load block characterized in that the wear identification groove and the colored member are provided around the entire circumference of the rope groove of the load block sheave.

4. 2. The load block of claim 1, A load block characterized in that the wear identification groove and the colored member are provided in a portion of the circumferential direction of the rope groove of the load block sheave.

5. 2. The load block of claim 1, A load block characterized in that the wear identification groove and the colored member are provided at a plurality of locations in the circumferential direction of the rope groove of the load block sheave.

6. 2. The load block of claim 1, A load block characterized in that the colored member is made of a chalk material and can be wiped off after adhering to the wire rope.

7. 2. The load block of claim 1, The load block is characterized in that the coloring member is made of a solid pigment, and the coloring will not fade even after the wire rope is colored.

8. 2. The load block of claim 1, A load block comprising a sheave cover for covering the load block sheave.

9. An electric hoisting machine comprising: a hoisting motor; a drum driven by the hoisting motor; a wire rope wound around the drum; and a load block attached to the wire rope and used to suspend a load, the load block being moved up and down by the wire rope as the drum rotates, The load block is A hook for hanging a load, A trunnion supporting the hook; a load block sheave that is rotatably attached to the axis of the trunnion and has a rope groove on its outer periphery for winding the wire rope; Equipped with The load block sheave is provided with a wear identification groove in a circumferential direction at the bottom of the rope groove, An electric hoist, characterized in that a coloring member is provided at a location of the wear detection groove at a depth equal to or greater than the wear limit value, for coloring the wire rope upon contact therewith.

10. The electric hoist according to claim 9, An electric hoist characterized in that the wire rope comes into contact with the colored member and is colored, thereby making it possible to recognize that the load block sheave has reached its wear limit.

11. The electric hoist according to claim 9, An electric hoist, characterized in that the wear identification groove and the colored member are provided around the entire circumference of the rope groove of the load block sheave.

12. The electric hoist according to claim 9, An electric hoist, characterized in that the wear identification groove and the colored member are provided in a portion of the circumferential direction of the rope groove of the load block sheave.

13. The electric hoist according to claim 9, An electric hoist, characterized in that the wear identification groove and the colored member are provided at a plurality of locations in the circumferential direction of the rope groove of the load block sheave.

14. The electric hoist according to claim 9, The electric hoist is characterized in that the colored member is made of a chalk material, and can be wiped off after adhering to the wire rope.

15. The electric hoist according to claim 9, The electric hoist is characterized in that the coloring member is made of a solid pigment, and the coloring does not fade even after the wire rope is colored.

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