JP5204416B2 - Hoisting machine - Google Patents

Description

  The present invention relates to a hoisting machine such as an electric chain block or an electric hoist that is driven by an inverter having a built-in load lifting motor, and in particular, can efficiently dissipate heat generated by the inverter to the outside air, and regenerative braking of the load lifting motor. The present invention relates to a hoisting machine capable of efficiently dissipating heat generated by flowing a regenerative current generated through a regenerative braking resistor to the outside air and capable of high-frequency operation.

  There are hoisting machines such as an electric chain block and an electric hoist using an inverter-driven electric motor driven by an inverter built in the hoisting machine main body as an electric motor for lifting and lowering the load. In such a hoisting machine, for safety, when the temperature of the inverter exceeds a predetermined set temperature, the inverter is tripped (shut off) so that the hoisting machine cannot be operated. When the hoisting machine is operated at a high frequency, that is, when the operating time of the hoisting machine + the operation time is taken as 100%, and the operation time is 60% or more, the heat generated from the inverter is large, and the control that houses the inverter This heat stays in the box. When the temperature in the control box exceeds the predetermined set temperature value (for example, 100 ° C.), there is a problem that the inverter trips and the hoisting machine cannot be operated.

  FIG. 1 is a plan sectional view showing an internal configuration of a control box of this type of conventional electric chain block. In the control box 100, an inverter 102, an electromagnetic switch 103, and a transformer 104 mounted on a steel panel board 101 are arranged. When the electric chain block is operated at a high frequency, a large amount of heat is generated from the inverter 102 as described above. Since the panel board 101 is made of steel, this heat is inferior in heat conductivity compared to aluminum or the like, and the heat dissipation is also poor because the board thickness is thin. Therefore, since there is no escape place of heat, there is a problem that heat stays in the control box 100, becomes high temperature, and the inverter 102 trips. In FIG. 1, reference numeral 105 denotes a speed reduction mechanism casing in which a speed reduction mechanism (detailed later) of the electric chain block is accommodated.

  As a countermeasure, there is a method in which the control box 100 is made of aluminum and the inverter 102 is attached to the inner wall surface of the control box 100 as shown in FIG. According to this, since the control box 100 is made of an aluminum material having a good thermal conductivity and its outer wall surface is exposed to the outside air, the heat dissipation effect of the inverter 102 can be expected, but the electromagnetic switch 103 other than the inverter 102 and Since the transformer 104 and the like are attached to the main body side of the hoisting machine via the panel plate 101, there is a problem that wiring and maintenance are difficult. There is also a concern that when the control box 100 is impacted, the inverter 102 is directly impacted.

  In the hoisting machine, when the suspended load is lowered, the load elevating motor functions as a generator, and the regenerative current generated by the hoisting machine is supplied to the regenerative braking resistor and consumed as heat, thereby raising and lowering the suspended load. Regenerative braking is applied to the motor.

  FIG. 3 is a diagram showing a configuration example of this type of conventional regenerative braking resistor. FIG. 3 (a) is a plan view, FIG. 3 (b) is a front view, and FIG. 3 (c) is a right side view. is there. As shown in the figure, the resistor 110 has a structure in which a nichrome wire is wound around a long resistor element (for example, a rod body made of a heat-resistant insulating material) in a rectangular metal casing 111 made of a metal plate (for example, an aluminum plate). Resistance element) 112 is disposed, and a space inside the metal casing 111 other than the resistance element 112 is filled with a heat-resistant insulating material 113 made of an inorganic material. Also, one end of the resistance element 112 and the resistance element 112 is electrically connected in series with the lead wire 115 in the metal casing 111, and the lead wire 114 connected to the other end extends from the end of the metal casing 111.

  When the resistor having the resistance element 112 arranged in the rectangular metal casing 111 as described above is used as the regenerative braking resistor, a large amount of current is generated in the regenerative braking resistor when the hoisting machine is operated at a high frequency. The flow temperature rises, and the temperature rises due to the temperature rise. When the inverter temperature exceeds the set temperature, the inverter trips. Further, when the regenerative current generated by the load lifting / lowering motor is large, it is necessary to use a plurality of resistors 110, and there is a problem that wiring and mounting are troublesome.

As a countermeasure when the regenerative current generated by the motor when the load is lowered is large, there is a method of increasing the number of resistance elements 112 arranged in the metal casing 111 as shown in FIG. There is a problem in that heat is released and a large amount of heat is released, but the surface area of the metal casing 111 cannot be increased, resulting in poor heat dissipation. Therefore, as shown in FIG. 4B, there is a method of attaching the heat sink 120 separately from the resistor 110, but there is a problem that the dimension, particularly the height dimension, of the resistor 110 including the heat sink 120 is increased. In addition, if the contact state between the heat sink 120 and the resistor 110 is not good, there is a problem that heat dissipation is inferior. In addition, there is a problem that the number of parts is increased by the heat sink 120 and the cost is increased.
JP-A-8-91784 Japanese Utility Model Publication 5-39603 JP-A-10-32101

  The present invention has been made in view of the above points, and can efficiently dissipate heat generated by a built-in inverter and heat generated by a regenerative braking resistor to the outside air with a simple configuration, and capable of high-frequency operation. The purpose is to provide an aircraft.

In order to solve the above-mentioned problem, the invention described in claim 1 is provided with a load lifting motor, a speed reduction mechanism, and a regenerative braking resistor, and the load lifting motor is driven by an inverter built in a hoisting machine main body. When the suspended load is lowered, the current generated by the load raising / lowering electric motor is caused to flow through the regenerative braking resistor, and the regenerative braking resistor forms a surface with an uneven corrugated shape. And a corrugated metal plate and a flat metal plate formed in a corrugated corrugated shape corresponding to the corrugated corrugated shape on the back surface, comprising a resistor casing having a configuration in which the corrugated metal plate and the flat metal plate are superposed, A resistor element is disposed in a recessed space on the back surface of the corrugated metal plate of the resistor casing, and a space between the corrugated metal plate including the back surface recessed space of the corrugated metal plate and the flat metal plate is filled with an insulating material, Hanging Radiating generated electric current falling time the load lifting motor to flow to the resistance element of the regenerative braking resistor, through the heat dissipating means the heat generated by the inverter to the speed reduction mechanism casing that houses the reduction gear mechanism It is characterized by having constituted so .

  According to a second aspect of the present invention, in the hoisting machine according to the first aspect, the heat dissipating means attaches the inverter to the speed reduction mechanism casing at least partially in surface contact, and generates heat generated by the inverter. Is radiated to the speed reduction mechanism casing.

  According to a third aspect of the present invention, in the hoist according to the first or second aspect, the speed reduction mechanism casing is made of an aluminum material.

According to a fourth aspect of the present invention, in the hoist according to any one of the first to third aspects, the corrugated metal plate and the flat metal plate of the resistor casing are made of an aluminum material.

According to a fifth aspect of the present invention, in the hoist according to the fourth aspect , the corrugated metal plate of the speed reduction mechanism casing and / or the resistor casing is formed of aluminum die casting.

The invention described in claim 6 is the hoisting machine according to any one of claims 1 to 5, wherein the regenerative braking resistor, flat metal plate of said resistor casing to the casing of the hoist Is attached in contact with the outer surface of the casing of the hoisting machine.

The invention described in claim 7 is the hoisting machine according to claim 6, wherein the regenerative braking resistor is recessed groove longitudinal direction of the concavo-convex wave shape of the corrugated metal plate of the resistor casing is the vertical direction It is arranged so that it may be arranged.

According to the first aspect of the present invention, since the heat generated by the inverter is radiated to the speed reduction mechanism casing via the heat radiating means , the heat generated by the inverter is efficiently radiated to the outside air via the speed reduction mechanism casing having a large heat capacity. Is possible. Moreover, since the deceleration mechanism casing is an oil bath in which lubricating oil is accommodated, cooling of the inverter by oil cooling can be expected. Therefore, since the inverter can be efficiently cooled and the inverter temperature can be maintained below a predetermined trip temperature, the hoisting machine can be operated at a high frequency. The regenerative braking resistor has a resistor element disposed in a recessed space on the back surface of the corrugated metal plate of the resistor casing, and an insulating material is provided in a space between the corrugated metal plate and the flat metal plate including the back surface recessed space of the corrugated metal plate. Since it is a filled configuration, the surface area of the corrugated metal plate is increased, and the surface having this large area becomes a heat dissipation surface, so that heat from the resistance element can be effectively radiated. Therefore, since the heat of the regenerative braking resistor is also efficiently dissipated in accordance with the efficient dissipation of the inverter heat as described above, the hoisting machine can be operated at a higher frequency.

  According to the second aspect of the invention, the heat dissipating means is a means for dissipating and dissipating heat by attaching the inverter to the speed reduction mechanism casing at least partially in contact with the surface, so that the heat generated by the inverter can be efficiently generated with a simple configuration. It can be transmitted to the speed reduction mechanism casing to dissipate heat. In addition, since the inverter is mounted in close contact with the speed reduction mechanism casing, no space or members are interposed between the inverter and the speed reduction mechanism casing, so that the entire hoisting machine can be made compact.

  According to the third aspect of the present invention, since the speed reduction mechanism casing is made of an aluminum material having high thermal conductivity, the heat generated by the inverter can be radiated to the outside air more efficiently, and the cooling effect is improved.

According to the fourth aspect of the present invention, since the corrugated metal plate and the flat metal plate of the resistor casing of the regenerative braking resistor are made of an aluminum material, the aluminum material has high thermal conductivity. Heat can be expected to be effectively dissipated.

According to the invention described in claim 5 , since the corrugated metal plate of the resistor casing of the regenerative braking resistor is formed by aluminum die casting, the aluminum die casting can be thicker than the press. It also has the effect of lowering the surface temperature of the casing.

According to the sixth aspect of the present invention, the resistor for regenerative braking is attached to the casing of the hoisting machine with the flat metal plate of the resistor casing contacting the outer surface of the hoisting machine. Will come into contact with the surface of the corrugated metal plate of the casing of the regenerative braking resistor, further promoting the heat dissipation action. Furthermore, since heat is radiated from the flat metal plate of the regenerative braking resistor to the casing surface of the hoisting machine and radiated from the casing surface to the outside air, the heat radiation is further promoted. In addition, the casing and the speed reduction mechanism casing are separated by a gasket with low thermal conductivity so that the heat generated by the inverter is radiated through the speed reduction mechanism casing, and the heat generated by the regenerative braking resistor is directly radiated through the outside air and the casing surface. Therefore, the amount of heat radiation can be controlled, and the overall heat radiation effect can be enhanced.

According to invention of Claim 7 , since the resistor for regenerative braking is arrange | positioned so that the longitudinal direction of the uneven groove | channel of the uneven corrugated shape of the corrugated metal plate of a resistor casing may become an up-down direction, a corrugated metal plate The air heated on the surface of the surface becomes a rising air flow rising through the concave groove having the corrugated corrugation, and is discharged from the upper end and at the same time flows into the outside air from the lower end, thereby further promoting the heat radiation action.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is a plan sectional view showing an example of the internal configuration of the control box of the electric chain block according to the present invention. As shown, the inverter 12 is directly attached to the speed reduction mechanism casing 15. At this time, the contact surfaces of the inverter 12 and the speed reduction mechanism casing 15 are formed to be flat with each other, and are attached so as to be in close contact with each other (surface contact is intimate). The speed reduction mechanism casing 15 is formed of aluminum die casting, and lubricating oil (not shown) for lubricating gears and the like constituting the speed reduction mechanism is accommodated in the speed reduction mechanism casing 15.

  In the control box 10, an electromagnetic switch 13 and a transformer 14 mounted on a steel panel plate 11 are arranged. When the electric chain block is operated at a high frequency, a large amount of heat is generated from the inverter 12 as described above. This heat is transmitted from the inverter 12 to the speed reduction mechanism casing 15 and is radiated from the speed reduction mechanism casing 15 to the outside air. As described above, the speed reduction mechanism casing 15 is made of an aluminum material having a high thermal conductivity and is thickly formed by die casting. Therefore, heat generated by the inverter 12 is efficiently transmitted to the speed reduction mechanism casing 15 and radiated to the outside air. It will be. Moreover, since the deceleration mechanism casing 15 contains lubricating oil and is an oil bath, cooling of the inverter by oil cooling can be expected. Further, by directly attaching the inverter 12 to the speed reduction mechanism casing 15, the control box 10 can be reduced in size from the state indicated by the dotted line to the state indicated by the solid line (the overall length of the electric chain block can be reduced).

  Further, as described above, the contact surfaces of the inverter 12 and the speed reduction mechanism casing 15 are formed to be flat with each other, and the inverter can be efficiently cooled with an extremely simple configuration in which both are attached so as to be in close contact with each other. In particular, since the heating mechanism that generates heat is not disposed in the speed reduction mechanism casing 15 like the inverter 12, the load lifting motor 41, and the suspended load dropping mechanical brake 51. Effective cooling can be expected.

  FIG. 6 is a plan sectional view showing an example of the overall configuration of the electric chain block including the control box 10 having the above-described configuration. The electric chain block 20 includes a main body casing 21, the control box 10 is connected to one end of the main body casing 21, and the inverter 12 in the control box 10 is directly attached to the speed reduction mechanism casing 15. One end of a motor casing 40 is connected to the other end of the main casing 21, and a fan cover 50 is connected to the other end of the motor casing 40. The main body casing 21 accommodates the chain block main body 22, the motor casing 40 accommodates the load lifting motor 41, and the fan cover 50 accommodates the fan blades 54 and the hanging brake mechanical brake 51. Yes.

  The chain block body 22 includes a hollow driven shaft 26 and a drive shaft 25 that passes through the hollow driven shaft 26. The hollow driven shaft 26 is rotatably supported by bearings 23 and 24, and the drive shaft 25 is rotatably supported by bearings 34 and 35. One end of the drive shaft 25 is connected to the rotary shaft 46 of the load raising / lowering electric motor 41, the other end extends through the hollow driven shaft 26, and gear teeth with which the large-diameter intermediate driven gear 27 meshes are formed on the outer periphery of the end portion. ing. The large-diameter intermediate driven gear 27 is fixed to a rotary shaft 28, and the rotary shaft 28 is rotatably supported on the speed reduction mechanism casing 15 by a bearing 29 and a bearing 30. A small-diameter intermediate driven gear 31 is fixed to the rotary shaft 28, and a large-diameter driven gear 32 fixed to the hollow driven shaft 26 is engaged with the small-diameter intermediate driven gear 31. A load sheave 33 is connected to the hollow driven shaft 26.

  The load lifting motor 41 includes a stator 42 and a rotor 43, and the stator 42 is fitted and fixed in the motor casing 40. The rotor 43 is fixed to a rotating shaft 46 that is rotatably supported via a bearing 44 and a bearing 45, and is disposed so as to penetrate the center portion of the stator 42. The mechanical brake 51 for preventing falling load is provided with a brake plate 52 fixed to the motor casing 40 and a brake plate 53 fixed to the rotary shaft 46, and automatically by a spring when the power of the load lifting motor 41 is cut off. The brake plate 52 is pressed against the brake plate 53 to restrain the rotating shaft 46 to prevent the suspended load from dropping, and when the power source is connected to the load lifting and lowering motor 41, the brake plate 52 is brought into the spring force by the magnetic force of the electromagnet. Accordingly, the rotary shaft 46 is opened away from the brake plate 53. A fan blade 54 is attached to the end of the rotating shaft 46.

  In the electric chain block configured as described above, the rotational force of the rotary shaft 46 of the load lifting / lowering motor 41 is transmitted to the drive shaft 25 of the chain block main body 22 and is engaged with the gear teeth formed on the drive shaft 25. 27, transmitted to the hollow driven shaft 26 through the small-diameter intermediate driven gear 31 and the large-diameter driven gear 32, and transmitted to the load sheave 33 connected to the hollow driven shaft 26, so that a chain (not shown) is wound up and down. It has become. That is, the rotational force of the load raising / lowering motor 41 is transmitted to the hollow driven shaft 26 through the speed reduction mechanism including the large diameter intermediate driven gear 27, the small diameter intermediate driven gear 31 and the large diameter driven gear 32, and rotates the load sheave 33. It is like that. In the reduction mechanism casing 15, lubricating oil (for lubricating the gear teeth formed on the drive shaft 25 constituting the reduction mechanism, the large diameter intermediate driven gear 27, the small diameter intermediate driven gear 31, and the large diameter driven gear 32 is provided. (Not shown) is accommodated.

  FIG. 7 is a diagram showing a schematic configuration of a drive circuit of the electric chain block. The electromagnetic switch 60 is closed, the inverter 12 is turned on, and the control circuit 61 gives control signals such as normal rotation, reverse rotation, speed signal, etc., so that the load lifting motor 41 rotates forward (hanging load) at a specified speed. ) In the reverse direction (winding direction of the suspended load). A large amount of heat is generated from the inverter 12 when the electric chain block is operated at a high frequency, i.e., when the operation time of the hoisting machine + operation time is 100% and the operation time is 60% or more. As described above, by directly attaching the inverter 12 to the speed reduction mechanism casing 15, heat from the inverter 12 is efficiently radiated to the outside air through the speed reduction mechanism casing 15, so that the inverter 12 is effectively cooled. . Moreover, since the lubricating oil is accommodated in the speed reduction mechanism casing 15 as described above and the speed reduction mechanism casing is an oil bath, the inverter 12 is also oil-cooled. Thereby, even if the hoisting machine is operated at a high frequency, the inverter 12 can avoid a trip without raising the temperature to a predetermined trip temperature value (for example, 100 ° C.) or more.

  Further, as shown in FIG. 6, a regenerative braking resistor 70 is attached to the side of the control box 10, and when the load lifting motor 41 lowers the suspended load, it functions as a generator and generates power. The regenerative current is energized and consumed in the regenerative braking resistor 70 to apply regenerative braking to the load lifting motor 41. During operation of the load lifting motor 41, the fan blades 54 rotate to send air to the suspended load drop prevention mechanical brake 51 and the load lifting motor 41 for cooling.

  8A and 8B are diagrams showing a configuration example of the regenerative braking resistor 70. FIG. 8A is a plan view, FIG. 8B is a front view, and FIG. 8C is an AA cross-sectional view. As shown in the figure, the regenerative braking resistor 70 includes a casing 71 composed of a corrugated metal plate 72 and a flat metal plate 73. The corrugated metal plate 72 is made of an aluminum material, and has a configuration in which the surface is formed into an uneven corrugated shape by die casting and the back surface is formed into an uneven corrugated shape corresponding to the uneven corrugated shape. Moreover, the height dimension H1 of the both sides of the corrugated metal plate 72 is formed larger than the height dimension H2 of the concavo-convex part (H1> H2). The flat metal plate 73 is made of a flat aluminum material. A casing 71 is configured by overlapping a corrugated metal plate 72 and a flat metal plate 73.

  A resistance element 74 is disposed in a recessed space 75 on the back side of the corrugated metal plate 72 of the casing 71, and a space between the corrugated metal plate 72 and the flat metal plate 73 including the recessed space 75 is filled with an insulating filler 76. ing. As the insulating filler 76, for example, heat resistant cement such as heat resistant silicon cement is used. Further, the corrugated metal plate 72 and the flat metal plate 73 are joined by fixing the flat metal plate 73 to the corrugated metal plate 72 by screwing screws 77 into the corrugated metal plate 72 through the flat metal plate 73. The plurality of resistance elements 74 are electrically connected in series, and lead terminals 80 for energization are led out from the side of the casing 71 to the outside.

  The resistance element 74 may be any resistor as long as the current can be efficiently converted into heat when energized. For example, as shown in FIG. 9, the resistance element 74 is made of a heat-resistant insulating material such as a ceramic material. A structure in which a resistance wire 79 such as a nichrome wire is wound around a columnar material (or cylindrical material) 78 may be used.

  By configuring the regenerative braking resistor 70 as described above, when a current is passed through the resistance element 74, the generated heat is transmitted to the corrugated metal plate 72 made of an aluminum material having good thermal conductivity through the insulating filler 76. Since the corrugated metal plate 72 has an uneven corrugated surface and has a large surface area, it efficiently dissipates the transmitted heat to the outside air. Further, since the corrugated metal plate 72 is formed by aluminum die casting, the corrugated metal plate 72 can be made thicker than the press and has the effect of lowering the surface temperature.

  As shown in FIG. 10, a regenerative braking resistor 70 is attached to the outer surface of the control box 10, and a current generated by the load lifting motor 41 when the suspended load is lowered is a resistance element 74 of the regenerative braking resistor 70. The generated heat is transmitted to the corrugated metal plate 72 made of an aluminum material through the insulating filler 76. Since the corrugated metal plate 72 of the regenerative braking resistor 70 is formed with an aluminum corrugated surface by aluminum die casting as described above, the surface area of the corrugated metal plate 72 is increased, and the heat from the resistance element 74 can be efficiently dissipated. In particular, since the corrugated metal plate 72 is formed by aluminum die casting, it can be made thicker than a press, and thus has the effect of lowering the surface temperature.

  The control box 10 and the speed reduction mechanism casing 15 are partitioned by a gasket 16 having low thermal conductivity. Depending on the amount of heat generation and heat resistance of the inverter 12 attached to the speed reduction mechanism casing 15 and the amount of heat generation of the regenerative braking resistor 70 attached to the control box 10, the arrangement position of the gasket 16 having low thermal conductivity is appropriately determined. Instead, the amount of heat radiation and the heat conduction range are controlled from the surface of the electric chain block casing. It is effective to increase the surface area of the electric chain block casing that radiates heat generated by the regenerative braking resistor 70 with the regenerative braking resistor 70, but the heat is generated by the inverter 12 attached to the speed reduction mechanism casing 15. It is not preferable in terms of the heat resistance of the inverter 12 that affects the above. In addition, it is necessary to dissipate heat from the inverter 12 itself from the surface of the electric chain block casing. Therefore, when the inverter 12 has high heat resistance and a small amount of heat generation, the gasket 16 is attached at a position where the surface area of the control box 10 is increased, or the inverter 12 has low heat resistance or a heat generation amount. If there is a large amount, the surface area of the control box 10 is narrowed at the mounting position of the gasket 16, and the surface area of the speed reduction mechanism casing is increased accordingly, thereby effectively improving the heat dissipation performance of the entire hoisting machine. Can do. FIG. 10 is an enlarged view of the control box 10 portion of FIG.

  FIG. 11 is an enlarged view of another control box 10 portion of the electric chain block according to the present invention. As shown in the figure, a recess 81 is formed in a side portion of the control box 10, and a regenerative braking resistor 70 serving as a braking resistance is disposed in the recess 81. The opening part of the recessed part 81 is covered with the board 82 in which the some slit 82a as shown in FIG. 12 was formed. In this way, the recess 81 is formed in the side portion of the control box 10, and the regenerative braking resistor 70 is arranged in the recess 81, so that the regenerative braking resistor 70 is connected to the control box 10 as shown in FIG. 10. Since it does not protrude to the side, the appearance is improved.

  Further, here, the concave groove 72a of the corrugated metal plate 72 of the regenerative braking resistor 70 shown in FIG. 13 is arranged in the vertical direction, and the vertical groove of the concave portion 81 of the control box 10 is provided in the vertical direction. Is forming. As a result, the air A that has flowed in through the groove 10 a formed in the lower edge flows into the space (see FIG. 11) between the plate body 82 and the corrugated metal plate 72 and radiates from the surface of the corrugated metal plate 72. The temperature rises due to the generated heat, and an ascending air current rising through the concave groove 72a flows out through the groove 10a formed in the upper edge, and cool new air flows in from below. This further promotes the cooling effect. FIG. 13 is a view showing the side of the control box 10 with the plate 82 removed.

  As described above, the resistance element 74 of the regenerative braking resistor 70 is disposed in the recessed space 75 on the back surface of the corrugated metal plate 72 of the casing 21, and the position thereof is the opening of the recessed space 75 as shown in FIG. 14 (b), the upper portion of the recessed space 75 as shown in FIG. 14 (b), and the lower portion of the recessed space 75 as shown in FIG. 14 (c), the opening of the recessed space 75 as shown in FIG. 14 (a). The best heat dissipation effect was obtained by placing it in the section.

  When the configuration of the control box 10 is as shown in FIG. 11 and the electric chain block is operated at a high frequency using the regenerative braking resistor 70 in which the resistance element 74 is arranged at the position shown in FIG. The surface temperature A of the speed reduction mechanism casing 15, the outer wall surface temperature B of the control box 10, the surface temperature C of the corrugated metal plate 72 of the regenerative braking resistor 70, the bottom temperature D of the concave groove 72 a, and the portion where the inverter 12 is attached When the temperature of the surface temperature E of the speed reduction mechanism casing 15 was measured, satisfactory results were obtained, and the electric chain block could be operated at a high frequency.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, although the electric chain block has been described as an example of the hoisting machine in the above embodiment, the hoisting machine according to the present invention may be an electric hoist that winds and rewinds the wire rope with a drum.

  Further, in the above embodiment, as a heat radiating means for radiating the heat generated by the inverter 12 to the speed reduction mechanism casing 15, the inverter 12 is directly attached to the speed reduction mechanism casing 15 and attached, and the heat generated by the inverter 12 is transmitted to the speed reduction mechanism casing 15. However, the heat radiating means is not limited to this. For example, the heat generated by the inverter 12 may be guided to the speed reduction mechanism casing 15 using heat transfer means such as a heat pipe. Especially when other heat transfer means or other heat transfer means are used together when the inverter cannot be directly attached to the speed reduction mechanism casing or when the wide side wall of the inverter cannot be directly attached to the speed reduction mechanism casing. It is effective.

It is a top sectional view showing an internal configuration of a control box of a conventional electric chain block. It is a top sectional view showing an internal configuration of a control box of a conventional electric chain block. It is a figure which shows the structural example of the resistor for regenerative braking of the conventional winding machine, FIG. 3 (a) is a top view, FIG.3 (b) is a front view, FIG.3 (c) is a right view. It is a figure which shows the structural example of the resistor for regenerative braking of the conventional winding machine, Fig.4 (a) is a top view, FIG.4 (b) is a front view. It is a top sectional view showing an example of an internal configuration of a control box of an electric chain block according to the present invention. It is a plane sectional view showing the example of whole composition of the electric chain block concerning the present invention. It is a figure which shows schematic structure of the drive circuit of an electric chain block. It is a figure which shows the structural example of the resistor for regenerative braking of the electric chain block which concerns on this invention, Fig.8 (a) is a top view, FIG.8 (b) is a front view, FIG.8 (c) is AA sectional drawing. It is. It is a figure which shows the structural example of a resistive element. It is a top sectional view showing an internal configuration of another control box of the electric chain block according to the present invention. It is a top sectional view showing an internal configuration of another control box of the electric chain block according to the present invention. It is a figure which shows the external shape of the cover of the resistor for regenerative braking of the electric chain block which concerns on this invention. It is a figure which shows the attachment part of the resistor for regenerative braking of the control box part of the electric chain block which concerns on this invention. It is a figure which shows the arrangement position in the resistor casing of the resistance element of the resistor for regenerative braking of the electric chain block which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control box 11 Panel board 12 Inverter 13 Electromagnetic switch 14 Transformer 15 Deceleration mechanism casing 16 Gasket 20 Electric chain block 21 Main body casing 22 Chain block main body 23 Bearing 24 Bearing 25 Drive shaft 26 Hollow driven shaft 27 Large diameter intermediate driven gear 28 Rotation Shaft 29 Bearing 30 Bearing 31 Small-diameter intermediate driven gear 32 Large-diameter driven gear 33 Load sheave 34 Bearing 35 Bearing 40 Motor casing 41 Load lifting motor 42 Stator 43 Rotor 44 Bearing 45 Bearing 46 Rotating shaft 50 Fan cover 51 For preventing falling load Mechanical brake 52 Brake plate 53 Brake plate 54 Fan blade 60 Electromagnetic switch 61 Control circuit 70 Regenerative braking resistor 72 Corrugated metal plate 73 Flat metal plate 74 Resistance element 75 Recessed space 76 Insulation filling Filler 77 Screw 78 Columnar material (or cylindrical material)
79 Resistance wire 80 Lead terminal 81 Recess 82 Plate

Claims (7)

A motor for lifting and lowering a load, a speed reduction mechanism, and a resistor for regenerative braking, and driving the load lifting and lowering motor with an inverter built in the hoisting machine main body, and generating electric current with the load lifting and lowering motor when the suspended load is lowered In the hoisting machine that applies the regenerative braking to the regenerative braking resistor,
The regenerative braking resistor includes a corrugated metal plate and a flat metal plate, the corrugated metal plate having a concave and convex corrugated shape corresponding to the concave and convex corrugated shape, and a corrugated metal plate having a back surface corresponding to the concave and convex corrugated shape. A corrugated metal plate comprising a resistor casing having a configuration in which flat metal plates are stacked; a resistor element disposed in a concave space on the back surface of the corrugated metal plate of the resistor casing; and the corrugated metal plate including the back concave space on the corrugated metal plate; The space between the flat metal plates is filled with an insulating material,
When the suspended load is lowered, the current generated by the load raising / lowering electric motor is caused to flow through a resistance element of the regenerative braking resistor,
A hoisting machine configured to radiate heat generated by the inverter to a speed reduction mechanism casing that houses the speed reduction mechanism via a heat dissipation means . The hoist according to claim 1,
It said radiation means is mounted in intimate in surface contact at least a portion of the inverter to the speed reduction mechanism casing, characterized in that it is configured to dissipate heat generated by the inverter to the speed reduction mechanism casing Hoisting machine. In the hoist according to claim 1 or 2,
The hoisting machine characterized in that the speed reduction mechanism casing is made of an aluminum material. The hoist according to any one of claims 1 to 3 ,
The corrugated metal plate and the flat metal plate of the resistor casing are made of an aluminum material. The hoist according to claim 4 ,
The corrugated metal plate of the speed reduction mechanism casing and / or the resistor casing is formed of aluminum die casting. In the hoist according to any one of claims 1 to 5 ,
The regenerative braking resistor, hoist, characterized in that mounted is brought into contact with the casing outer surface of the winding-up mechanism of the flat metal plate of said resistor casing to the casing of the hoist. The hoist according to claim 6 ,
The regenerative braking resistor, hoist, characterized in that the recessed groove longitudinal direction of the concavo-convex wave shape of the corrugated metal plate of the resistor casing is arranged such that in the vertical direction.

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