Electric hoist and crane device

Abstract

To solve the problems that: since a hoist frame of a conventional electric hoist is configured such that components are cut into a plurality of pieces in required dimensions and then welded together, it is difficult to detect welding defects in welded structures through non-destructive testing for all items, resulting in high costs for managing welding quality; and CO2 emissions increase due to the manufacturing energy used during welding.SOLUTION: An electric hoist equipped with a rope drum around which a wire rope is wound and an electric motor to rotate the rope drum is equipped with a pair of side plates which hold both ends of the rope drum and support shafts which are arranged parallel to the axis of the rope drum, pass through holes in the side plates at both ends and are fastened to the side plates to form the hoist frame. By using the electric hoist, there is no need to manage welding quality, and by eliminating the energy used during manufacturing by welding, it is possible to reduce CO2 emissions associated with the manufacture of the electric hoist.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an electric hoist and a crane apparatus. [Background technology]

[0002] An electric hoist is a hoisting device for a crane that hoists and transports cargo. The hoist is made up of components such as an electric motor and reducer that drive a rope drum that winds up the wire rope used to hoist and lower the load, and an electric trolley that acts as a traverse device, which are supported on a hoist frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-129988 [Patent Document 2] JP 2014-156318 A Summary of the Invention [Problem to be solved by the invention]

[0004] The hoist frame of a conventional electric hoist, for example as shown in Patent Document 1, is made by cutting multiple thick plate members to the required dimensions and joining them together by welding. However, it is difficult to detect welding defects in welded structures by non-destructive testing of all the members, and controlling the welding quality is very costly.

[0005] In addition, the manufacturing energy used for welding reduces CO 2 There was a problem of increased emissions.

[0006] For this reason, for example, the hoist frame as shown in Patent Document 2 has a first frame and a second frame, and the base and end of each frame are butted together and welded to reduce the number of welding points. [Means for solving the problem]

[0007] The above problem is solved by an electric hoisting machine having a rope drum around which a wire rope is wound and an electric motor for rotating the rope drum, which has a pair of side plates that grip both ends of the rope drum and This problem is solved by an electric hoist that has a number of support shafts arranged parallel to the axis of the rope drum, passing through holes in the side plates at both ends and fastened to the side plates, forming a hoist frame. Effect of the Invention

[0008] The present invention joins the traction machine frame without welding, eliminating the need to control welding quality. It also eliminates the energy used in manufacturing by welding, reducing the CO2 emissions associated with the manufacture of electric traction machines. 2 Emissions can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is an external perspective view of a crane with an electric hoist according to an embodiment of the present invention; [Diagram 2] 1 is a perspective view of an electric hoist in an embodiment of the present invention. [Diagram 3] FIG. 3 is a partial cross-sectional view of the electric hoist of FIG. 2. [Figure 4] FIG. 2 is an exploded view of the electric hoist in the embodiment of the present invention. [Diagram 5] FIG. 2 is a perspective view of a hoist frame in an embodiment of the present invention. [Figure 6] FIG. 2 is a front view of a hoist frame according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to Figures 1 to 6. However, the present invention is not limited to the illustrated examples.

[0011] FIG. 1 is an external perspective view of the overall configuration of a crane with an electric hoist in one embodiment of the present invention.

[0012] There are a pair of traveling rails 11a, 11b arranged to face each other, and a crane saddle 20a equipped with a driving wheel 25a for traveling and a driven wheel 26a is installed so as to be able to travel on the traveling rail 11a.

[0013] A crane saddle 20b having driving wheels 25b and driven wheels 26b is installed on the traveling rail 11b so as to be able to travel. The crane saddles 20a and 20b are connected by the lateral rail 10.

[0014] An electric trolley 2 is installed on the lateral rail 10 so as to be movable along the lateral rail 10, and is equipped with a saddle control unit 12 that controls the crane saddles 20a, 20b.

[0015] An electric hoist 1 for moving a load up and down is attached to the electric trolley 2, and the electric hoist 1 is equipped with a crane hook 4 for suspending the load.

[0016] The electric hoist 1 is also equipped with a hoist control unit 5 that controls the electric hoist 1 and the electric trolley 2, and an operation input device 3 for operating the crane with the electric hoist.

[0017] Next, the operation of the crane with electric hoist will be described with reference to Figure 1. When an operator inputs an operation using the operation input device 3, the hoist control unit 5 controls the movement of the electric hoist 1 and the electric trolley 2 in response to the input control signal, and the load attached to the crane hook 4 can be moved in the Z and -Z directions or the X and -X directions.

[0018] Similarly, in response to a control signal input via the operation input device 3, the saddle control unit 12 controls the movement of the crane saddles 20a and 20b, thereby moving the load attached to the crane hook 4 in the Y direction and the -Y direction.

[0019] Next, the overall configuration of the electric hoist of this embodiment will be described with reference to the external perspective views of Figs. 2 and 3.

[0020] As shown in Figures 2 and 3, the rope drum 37 is rotatably supported by the shaft 34 inside the right side plate 50 and the left side plate 51, which are components of the hoist frame 30, and is rotated by a drive device to wind and unwind the wire rope 36.

[0021] On the outside of the right side plate 50, an electric motor 31 serving as a drive device for rotating the rope drum 37 and a brake 35 serving as a braking mechanism for the electric motor 31 are combined and attached.

[0022] A reduction gear 40 that adjusts the rotational speed of the rope drum 37 is combined and attached to the outside of the hoist frame on the left side plate 51, and the drive shaft 32 of the electric motor 31 and the driven shaft 41 of the reduction gear 40 are connected by a shaft coupling 33 to transmit rotation.

[0023] The shaft 34 supporting the rope drum 37 is connected to the final gear stage of the reducer 40, and the rope drum 37 rotates using the power of the electric motor 31.

[0024] The drum frame cover 59 is a cover that protects the rope drum, which is the rotating part, from easy contact with hands, and by being sandwiched between the right side plate 50 and the left side plate 51, it prevents the right side plate 50 and the left side plate 51 from twisting when the support shaft 52 is attached and fixed to the right side plate 50 and the left side plate 51, and ensures that the right side plate 50 and the left side plate 51 are approximately parallel to each other.

[0025] Furthermore, by attaching a drum frame cover 59, the strength of the hoist frame can be increased.

[0026] The drum frame cover needs to be in contact with each side panel at two points, and is preferably a rectangular plate-shaped part. In addition, if it is not necessary to prevent it from being touched because it is usually installed at a high place, it is also possible to connect the side panels together by crossing wires or strip-shaped metal parts with the same strength as wires in an X shape.

[0027] The control unit frame cover 60 is a cover for mounting the hoist control unit 5, and by being sandwiched between the right side plate 50 and the left side plate 51, it serves to prevent twisting of the right side plate 50 and the left side plate 51 when the support shaft 52 is attached and fixed to the right side plate 50 and the left side plate 51, and to ensure that the right side plate 50 and the left side plate 51 are approximately parallel to each other.

[0028] The short support shaft 61 is a shaft whose length in the drum central axis direction is shorter than that of the support shaft 52 to prevent interference with the wire rope 36, and serves to fix the right side plate 50 and the drum frame cover 59, and the left side plate 51 and the drum frame cover 59, respectively.

[0029] 4 is an exploded view of an electric hoist in an embodiment of the present invention. Right side plate 50 and left side plate 51 are connected by three support shafts 52 and assembled in approximately parallel. Both ends of support shaft 52 are fixed to the side plates with bolts or nuts, eliminating the need for welding.

[0030] Furthermore, since the side plates are fastened by bolts and nuts, if the side plates are not assembled substantially parallel, this can be adjusted by adjusting the way the bolts are fastened.

[0031] When fixing with a bolt, a recess is provided in the end of the support shaft to insert the bolt and a screw thread is provided, and when fixing with a nut, a screw thread may be provided on the outer periphery of the end of the support shaft.

[0032] Furthermore, since some hoists use ropes of various lengths, the length of the rope drum 37 also changes depending on the length of the rope. For this reason, by using a support shaft 52 with a length corresponding to the length of the rope drum 37, it becomes possible to accommodate ropes of various lengths.

[0033] Therefore, it is no longer necessary to assemble a number of hoist frames by welding according to the length of the rope and to maintain an inventory to meet customer demands.

[0034] 5 is a perspective view of a hoist frame in an embodiment of the present invention. The hoist frame 30 is configured by connecting four support shafts 52, a right side plate 50, and a left side plate 51 together by eight key plates 53.

[0035] The right side plate 50 and the left side plate 51 face each other with their plate surfaces approximately parallel to each other, and the plate surfaces of the right side plate 50 and the left side plate 51 are provided with four holes whose diameters are larger than the small diameter portions at both ends of the support shaft 52 and smaller than the large diameter portion at the center of the support shaft 52, through which the support shaft 52 passes.

[0036] A key plate 53 having a diameter larger than the diameter of the holes in the right side plate 50 and the left side plate 51 through which the support shaft passes is fixed by a bolt or nut to the end face of the support shaft 52 located on the outer surfaces of the right side plate 50 and the left side plate 51, and the outer surfaces of the right side plate 50 and the left side plate 51 are fixed in their positions by the key plate 53.

[0037] The diameter of both ends of the support shaft 52 is smaller than that of the center, and the boundary between them forms a surface perpendicular to the axial direction of the support shaft. The fastening position of the support shaft and the side plate is determined by the contact of this surface with the side plate.

[0038] The opposing surfaces of the right side plate 50 and the left side plate 51 are fixed in position by the surfaces of the large diameter portion in the center of the support shaft 52 coming into contact, and if the overall length of the small diameter portion at the end of the support shaft 52 is greater than or equal to the minimum plate thickness for which the right side plate 50 and the left side plate 51 can be manufactured and less than or equal to the maximum plate thickness for which the right side plate 50 and the left side plate 51 can be manufactured, then it is possible to minimize rattling caused by the right side plate 50 and the left side plate 51 moving in the axial direction of the support shaft 52.

[0039] Furthermore, the configuration of key plate 53 is not limited to the example shown in the figure, and a method may be used in which the overall length of the small diameter portion of the end of support shaft 52 is made longer than the thickness of right side plate 50 and left side plate 51, and a key groove of a width equal to or greater than the thickness of key plate 53 is carved into the side plate perpendicular to the central axis of the cylinder in the small diameter portion of the end of support shaft 52, and then a roughly rectangular key plate 53 is inserted into the groove to fix right side plate 50 and left side plate 51.

[0040] At this time, the length in the cylinder central axis direction from the end face of the large diameter portion of the support shaft 52 to the position where the small diameter portion of the support shaft 52 reaches the key groove start position is equal to or greater than the plate thicknesses of the right side plate 50 and the left side plate 51 .

[0041] 5 is a perspective view of a hoist frame in an embodiment of the present invention. The electric trolley 2 for moving the electric hoist 1 on the transverse rail 10 is attached to two of the four support shafts 52 arranged in parallel by a plate-shaped driving trolley frame 54 and a driven trolley frame 55 of the electric trolley 2.

[0042] The driving trolley frame 54 and the driven trolley frame 55 are each provided with two holes through which the support shaft 52 passes for attachment.

[0043] The driving trolley frame 54 and the driven trolley frame 55 are independent of each other, and the distance between the driving trolley frame 54 and the driven trolley frame 55 in the cylindrical central axial direction of the support shaft 52 can be changed arbitrarily.

[0044] The spacing between the trolley frames can be changed to an appropriate distance depending on the width of the transverse rail 10, and the trolley frames can be attached to a transverse rail 10 having a width within the range between the right side plate 50 and the left side plate 51.

[0045] This makes it possible to apply the present invention to a wider range of lateral rails 10 than the configuration shown in Patent Document 1.

[0046] To position the driving trolley frame 54 and the driven trolley frame 55, for example, as shown in FIG. 5, a set collar 56 is used, which is bent by tightening a bolt to fix it to the support shaft 52.

[0047] A total of eight set collars 56 are passed through the support shaft 52 and positioned at the front and rear of the face of the driving trolley frame 54 and the front and rear of the face of the driven trolley frame 55. By sandwiching the driving trolley frame 54 and the driven trolley frame 55 with the set collars 56, the driving trolley frame 54 and the driven trolley frame 55 can each be independently fixed at any position in the direction of the cylindrical central axis of the support shaft 52.

[0048] In order to easily fix the driving trolley frame 54 and the driven trolley frame 55 in an appropriate position relative to the specified transverse rail 10, for example, as shown in Figure 5, a screw thread is formed on the large diameter portion of the approximately cylindrical shape of the two support shafts 52 that support the driving trolley frame 54 and the driven trolley frame 55.

[0049] Instead of set collars 56, eight connecting nuts 57 having threads formed on their inner diameter that mesh with the threads formed on the support shaft 52 are arranged in front and behind the face of the driving trolley frame 54 and in front and behind the face of the driven trolley frame 55.

[0050] By clamping and tightening the drive trolley frame 54 and the driven trolley frame 55 with a set collar 56, the drive trolley frame 54 and the driven trolley frame 55 can each be independently fixed at any position in the cylindrical central axis direction of the support shaft 52.

[0051] The presence of the screw thread has the effect that the connecting nut 57 is less likely to shift position when installing the driving trolley frame 54 and the driven trolley frame 55, and is easier to tighten.

[0052] In addition to the connecting nuts 57, if a total of four set collars 56 are arranged in the loosening direction of the four connecting nuts 57 arranged on the outside of the driving trolley frame 54 and the driven trolley frame 55, the connecting nuts 57 will loosen due to vibrations caused by the up and down movement of the electric hoist 1 and the horizontal movement of the electric trolley 2, preventing unintended movement of the trolley.

[0053] The electric hoist 1 can be prevented from falling off the traverse rail 10 due to movement of the driving trolley frame 54 toward the right side plate 50 and movement of the driven trolley frame 55 toward the left side plate 51.

[0054] 6, the sheave 42 can be supported on a support shaft 52 via the sheave cover 43. The position of the sheave cover 43 can be fixed by a substantially cylindrical positioning collar 58 of any length.

[0055] The positioning collar 58 is rotatably supported by the support shaft 52 by passing the support shaft 52 through the inner diameter of the positioning collar 58 .

[0056] As a result, the side of the sheave cover 43 contacts the cross section of the first positioning collar 58 arranged between the right side plate 50 and the sheave cover 43, and the cross section of the second positioning collar 58 arranged between the left side plate 51 and the sheave cover 43, thereby constraining the support axial direction position of the sheave cover 43.

[0057] In this way, according to the present invention, the hoist frame is joined without welding, making it unnecessary to control the welding quality. Furthermore, by eliminating the energy used in manufacturing by welding, the CO2 emissions associated with the manufacture of electric hoists can be reduced. 2 Emissions can be reduced.

[0058] Furthermore, by combining side plates and support shafts and rope drums of different lengths, a wide variety of hoists can be provided without having to prepare a hoist frame for each type of hoist. [Explanation of symbols]

[0059] 1...electric hoist, 2...electric trolley, 3...operation input device, 4...crane hook, 5...hoist control unit, 10...traverse rail, 11a, 11b...traveling rail, 12...saddle control unit, 20a, 20b...crane saddle, 25a, 25b...traveling drive wheel, 26a, 26b...driven wheel, 30...hoist frame, 31...electric motor, 32...drive shaft, 33...shaft coupling, 34...shaft, 35...brake, 36... Wire rope, 37... rope drum, 40... reducer, 41... driven shaft, 42... sheave, 43... sheave cover, 50... right side plate, 51... left side plate, 52... support shaft, 53... key plate, 54... driving trolley frame, 55... driven trolley frame, 56... set collar, 57... connecting nut, 58... positioning collar, 59... drum frame cover, 60... control unit frame cover, 61... short support shaft

Claims

1. In an electric hoisting machine having a rope drum around which a wire rope is wound and an electric motor for rotating the rope drum, A pair of side plates that hold both ends of the rope drum; An electric hoist having a plurality of support shafts arranged parallel to the axis of the rope drum, passing through holes provided in the side plates at both ends and fastened to the side plates, forming a hoist frame.

2. The electric hoist according to claim 1, The support shaft has a large diameter portion at a central portion and small diameter portions at both ends, and has a fixing surface perpendicular to the support shaft at a portion where the large diameter portion changes to the small diameter portion, The support shaft passes through a hole in the side plate, and the distance between the pair of side plates is determined by the fixing surface abutting against the side plate, and the electric hoist is fixed by the fixing surface to a nut arranged on the opposing surface of the side plate with which the fixing surface abuts.

3. The electric hoist according to claim 2, An electric hoist equipped with a drum frame cover, which is a square plate-shaped part that is fastened to the side plates at both ends that constitute the hoist frame and reinforces the multiple support shafts so that they are approximately parallel.

4. The electric hoist according to claim 2, An electric hoist is provided with a control unit frame cover, which is a square plate-shaped part that is fastened to the side plates at both ends that make up the hoist frame and reinforces the multiple support shafts so that they are approximately parallel, and on which a control unit that controls the hoist can be attached.

5. The electric hoist according to claim 1, Among the support shafts fixed to the upper part of the side plate, at least two of the support shafts have large diameter portions provided with threads for fixing a trolley frame, The support shaft passes through a hole provided in the trolley frame, The trolley frame is positioned and fixed to the support shaft by connecting nuts on both sides. An electric hoist in which a set collar is arranged on the side of the trolley frame close to the side plate to prevent the connecting nut from loosening.

6. The electric hoist according to claim 2, A sheave for winding a wire rope is provided, and the sheave is suspended on the support shaft by a sheave cover. An electric hoist in which the axial suspension position of the sheave cover on the support shaft is determined by a positioning collar.

7. The electric hoist according to claim 6, A plurality of said positioning collars are provided, The positioning collar is generally cylindrical, and has an inner diameter larger than an outer diameter of the large diameter portion of the support shaft. The positioning collar is inserted into the support shaft. An electric hoist that fixes the sheave position by suspending the sheave cover between the positioning collars.

8. A crane apparatus including a traveling rail, a crane saddle that travels on the traveling rail, a cross rail provided on the crane saddle, and an electric hoist attached to the cross rail by a trolley, The electric hoist consists of a rope drum with a wire rope wound around it, An electric motor that rotates the rope drum; A pair of side plates that grip both ends of the rope drum; A crane apparatus comprising: a plurality of support shafts arranged parallel to the axis of the rope drum, passing through holes provided in the side plates at both ends, and fastened to the side plates, forming a hoisting machine frame.

9. 9. The crane apparatus according to claim 8, Among the support shafts fixed to the upper part of the side plate of the electric hoist, at least two of the support shafts have large diameter portions provided with threads for fixing a trolley frame, The support shaft passes through a hole provided in the trolley frame, The trolley frame is positioned and fixed to the support shaft by connecting nuts on both sides. A crane device which is an electric hoisting machine in which a set collar is arranged on the side of the trolley frame close to the side plate to prevent the connecting nut from loosening.

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