KR200479293Y1 - Electric chain hoist including discharging resistor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric chain hoist using a single-phase motor driven through a magnetic connector and a capacitor. The electric chain hoist according to one embodiment of the present invention includes a motor portion having a stator, a rotor and a rotor shaft, A chain portion including a reduction gear portion connected to the rotor shaft and a load sheave connected to the chain and the reduction gear portion to hoist the chain; a brake portion capable of rotating and fixing the rotor shaft of the motor portion; And a power control unit for controlling the power supplied to the power control unit, and the discharge resistor is connected in parallel to the capacitor of the power control unit.

Description

ELECTRIC CHAIN HOIST INCLUDING DISCHARGING RESISTOR [0002]

The present invention relates to an electric chain hoist, and more particularly to a motor-driven hoist using a single-phase motor driven through a magnetic connector and a capacitor.

A hoist is a device used to transport cargo or disassemble machinery in a warehouse, a railway station, a mold factory, a foundry factory, etc., which lifts or lifts a heavy object and moves it to a desired position. The hoist moves the cargo to the desired position by lifting the cargo using a hook attached to the end of the chain and then moving in the lateral direction (left and right).

The hoist is generally divided into a manual hoist, in which the operator moves the chain by himself, and an electric hoist, which is operated by using a motor. Also, it can be classified into a rode head type used at a low ceiling and a double rail type traveling on two rails depending on the place and machine structure used.

The electric hoist is a small hoist that concentrates a small motor, a chain-wound block and an electromagnetic brake holding a cargo in a narrow container space. It is attached to the end of a jib, It is used to move the lower flange of the beam to the rail and to transport the cargo up and down. It mainly operates by operating the switch connected to the hoist wired or wireless.

It is known that a motor of a motor-driven hoist uses a three-phase motor which is driven by receiving power from a three-phase power supply. It is known that a three-phase motor is used as a driving method.

When such a three-phase motor is used, there is an advantage that the output is large and advantageous for high-speed operation. However, a three-phase motor necessarily requires a three-phase power supply, and its use area is limited to the factory area to which three-phase power is supplied. In the case of an electric hoist, the motor is restarted inevitably in order to adjust the position of the cargo. In the case of using a three-phase motor, it is difficult to adjust the speed. there is a problem.

The present invention is to solve the problems of the background art described above and provides a motorized hoist that can protect workers from the risk of electric shock while supplying electric power stably without being restricted by the use area by using a single phase motor It has its purpose.

An electric chain hoist according to an embodiment of the present invention includes a motor portion having a stator, a rotor, and a rotor shaft, a deceleration base portion connected to a rotor shaft of the motor portion, and a load sheave connected to the chain and the deceleration base portion, And a power control unit for controlling power supplied to the motor unit, the motor unit including a magnetic connector and a capacitor. Here, discharge resistors are connected in parallel to the capacitors of the power control section.

The motor unit may be a single-phase motor.

The power control unit may further include a start switch, and the start switch may include a discharge resistor.

The power control unit may further include a counter connected to the magnetic connector for counting and displaying the number of operations of the motor unit.

According to one embodiment of the present invention, it is possible to protect a worker from the risk of electric shock through the connection of the discharge resistor while stably driving the single-phase motor through the capacitor starting system in the electric chain hoist.

1 is a perspective view of an electric chain hoist according to one embodiment of the present invention.
2 is a front view of an electric chain hoist according to one embodiment of the present invention.
3 is a side view of an electric chain hoist according to one embodiment of the present invention.
4 is a cross-sectional view of an electric chain hoist according to one embodiment of the present invention.
5 is an enlarged view of the inside of the power control unit according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In order to clearly illustrate the present invention, parts not related to the present invention are omitted, and the same reference numerals are used for the same components throughout the specification. In addition, the size of each constitution shown in the drawings is arbitrarily shown for the sake of convenience of explanation, and therefore the present invention is not necessarily limited thereto.

That is, the specific shapes, structures, and characteristics described in the specification may be changed and embodied from one embodiment to another without departing from the spirit and scope of the present invention. It is to be understood that changes may be made without departing from the scope. Accordingly, the following detailed description is not to be taken in a limiting sense, and the scope of the present invention should be construed as covering the scope of the claims of the claims and all ranges equivalent thereto.

FIG. 1 is a perspective view of an electric chain hoist according to an embodiment of the present invention. FIG. 2 and FIG. 3 are front and side views, respectively, of an electric chain hoist according to an embodiment of the present invention.

1 to 3, an electric chain hoist 10 according to an embodiment of the present invention includes a motor unit 100, a reduction gear unit 200, a chain unit 300, a brake unit 400, (500). In the motor unit 100, power is supplied through the power control unit 500 to drive the motor, and the power of the motor is transmitted to the chain unit 300 through the speed reducer 200.

The chain part 300 includes a chain 310 which can move up and down reciprocally by the power of the motor and a chain block 320 having a load sheave therein so as to wind the chain 310 when the chain 310 reciprocates up and down A chain box 330 disposed outside of the chain block 320 and surrounding the chain 310; a hook 340 connected to one end of the chain 310 to suspend the cargo; And a bumper 350 mounted on the upper portion of the bumper 340.

The chain 310 is rigidly connected to an iron ring for lifting heavier cargo, and the hook 340 is snapped to connect the cargo in a robust but simple manner. The chain block 320 winds the load on the hook 340 with a tensile force to maintain the rolled state even if the power transmitted to the chain 310 is disconnected. In this embodiment, the chain 310 is connected to the hook 340 in one line, but it is also possible to connect the chain 310 in two lines in order to increase the load of the load able to withstand.

The power control unit 500 includes a capacitor and a magnetic connector, and is connected to a power source to drive the motor. In this embodiment, a single-phase motor connected to a single-phase power source and driving a motor is used. The driving method of the single-phase motor will be described later.

The electric chain hoist 10 according to the present embodiment further includes an upper hook 600 and a load limiter 700. The upper hook 600 is coupled to a rail provided on the ceiling so that the power chain hoist 10 can move in one direction along the rail. The load limiter 700 signals a worker through a warning sound or the like when the load hanging on the electric chain hoist 10 exceeds the rated load so as to prevent a chain accident or a safety accident . Further, the electric chain hoist 10 is provided with an operation switch (not shown) to control the operation start or stop operation of the electric chain hoist 10 by wire or wirelessly.

FIG. 4 is a cross-sectional view showing a section of the electric chain hoist according to the present embodiment cut in a direction in which the chain extends. Hereinafter, an operation of the electric chain hoist will be described in detail with reference to FIG.

The motor unit 100 includes a stator 110 and a rotor 120 in a motor case 140 and the stator 110 is fixed to the motor case 140. The rotor 120 is fixed to a rotor shaft 130 rotatably supported via a bearing, and the rotor shaft 130 is disposed to pass through the center of the stator 110.

A brake unit 400 is installed at one end of the motor unit 100. The brake portion 400 has a full rotor 410, a movable core 420, a brake lining 430, a brake spring 440 and a brake case 450.

The full rotor 410 is made of a magnetic material and is engaged with the rotor shaft 130 of the motor unit 100. The movable core 420 is also made of a magnetic material and is spline-coupled to be disposed adjacent to the full rotor 410 and movable in the longitudinal direction while being not rotatable with respect to the rotor shaft 130. The brake lining 430 is fixed to the movable core 420 and a brake spring 440 is installed between the full rotor 410 and the movable core 420. The brake spring 440 elastically presses the movable core 420 so that the brake lining 430 is pressed to the brake case 440.

On the opposite side of the brake unit 400, a power control unit 500 for transmitting electric power to the motor unit 100 is installed. The power control unit 500 includes a start capacitor 510, a run capacitor 520, a start switch 530, a discharge resistor 540, a magnetic connector, A power transformer 550, a transformer 560, and a terminal block 570, which are housed in a power control unit case 580.

The starting capacitor 510 and the driving capacitor 520 make an electrical phase difference between the main winding and the auxiliary winding to generate a rotating magnetic field in the motor unit 100 when the motor is started and driven, and the magnetic connector 550 is an electromagnetic contactor It is used for frequent control of start and stop of the motor.

5 is an enlarged view of the inside of the electric power control unit according to the present embodiment. Referring to this, when the operation of operating the electric chain hoist 10 is performed, the operation of the magnetic connector 550 via the start switch 530 And current flows to the motor by the contact of the magnetic connector 550. The power source is directly connected to the fuse 561. The fuse 561 is disconnected when an overcurrent flows to serve as a breaker.

A counter 551 is connected to the magnetic connector 550 to count the number of times the motor is operated and display it to the operator. Through this, the operator can confirm the use of the electric chain hoist (10) electric components and replace the electric components in advance before the hoist goes out of operation due to the component failure.

On the other hand, when the electric chain hoist 10 is operated and the operation is stopped due to switch operation or overload of the operator, residual charge is accumulated in the capacitor 510. When the motorized chain hoist 10 is used, the motor may be frequently restarted to accurately adjust the position of the cargo. If such frequent restarting is performed, the operator is exposed to the risk of electric shock due to excessive residual charge.

In order to solve such a problem, in this embodiment, a discharging resistor 540 is connected in parallel to the starting capacitor 510 to discharge the residual charge accumulated in the starting capacitor 510. A discharge resistor 540 may be connected to the starting capacitor 510 to quickly discharge the residual charge accumulated in the starting capacitor 510 according to frequent restarts in the present embodiment Connect.

As described above, in the present embodiment, when the starting capacitor 510 is quickly discharged, the restart of the electric hoist 10 is frequently prevented, thereby preventing the risk of electric shock and improving work stability.

Referring again to FIG. 4, electric power is supplied to the stator 110 of the motor unit 100 via the power control unit 500 when the operator operates the operation switch to operate the electric chain hoist 10. When the stator 110 coil is energized, a rotating magnetic field is generated, and the full rotor 410 of the brake unit 400 is magnetized by a part of the magnetic field, so that the movable core 420 is rotated against the elastic force of the brake spring 430 And is pulled toward the full rotor 410 side. Accordingly, the brake lining 430 fixed to the movable core 420 is released from the inner circumferential surface of the brake case 450 to release the brake.

The rotor 120 and the rotor shaft 130 of the motor unit 100 are rotated and transmitted to the rod sheave of the chain unit 300 via the reduction gear unit 200 to be engaged with the hook 340 The cargo can be lifted or lowered.

In this embodiment, the motor unit 100 is a single-phase motor. Therefore, the three-phase power source is not required for driving the motor, and it is possible to use in a region where a commercial single-phase power source is provided, such as a general home or commercial area, so that restrictions on the use area of the electric hoist are reduced.

Since the output of the single-phase motor is smaller than that of the three-phase motor, there is a problem that the size of the single-phase motor necessarily increases in order to obtain the same output. However, this embodiment solves this problem by using a three-stage speed reducer.

The reduction gear unit 200 is composed of a three-speed reduction gear composed of six gears of the first gear to the sixth gear. The first gear 211 is installed on the first drive shaft 210 connected to the rotor shaft 130 of the motor unit 100 and extending in the longitudinal direction of the rotor shaft 130. The first drive shaft 210 rotates together with the rotation of the rotor shaft 130 and the first gear 211 rotates together with the first drive shaft 210.

The second driving shaft 220 is disposed so as to be spaced apart from the first driving shaft 210 and the second gear 221 formed on the second driving shaft 220 is connected to the first gear 211. The second drive shaft 220 is provided with a third gear 223 in addition to the second gear 221 and a clutch disc and a clutch spring disposed on both sides of the second gear 221 to form a clutch. The clutch spring is disposed on one side of the second gear 221 and a clutch disc for transmitting the elastic force of the clutch spring to the second gear 221 is disposed closely between the second gear 221 and the clutch spring.

The third gear 223 is disposed so as to be connected to the fourth gear 231 provided on the third drive shaft 230. On the other hand, when the load of the cargo hanging on the hook 340 exceeds the set weight, the clutch spring 227 acts so that the third gear 223 and the fourth gear 231 are separated from each other by the elasticity thereof. Accordingly, the rotation of the fourth gear 231 separated from the third gear 223 is stopped, and the movement of the chain 310 interlocked with the third gear 223 is stopped.

The fifth gear 233 is installed on the third drive shaft 230 and rotates together with the fourth gear 231. The fifth gear 233 is connected to the sixth gear 240 arranged side by side and the sixth gear 240 rotates together with the rod sheave 321 in the chain block 320.

In this embodiment, helical gears are used as the first gear to the fourth gear, and the fifth gear and the sixth gear are used as spur gears to smoothly transmit power from the speed reducer.

As described above, in this embodiment, the power generated in the motor unit 100 is transmitted to the chain unit 300 through the three-stage speed reducer composed of six gears. The third gear 223 and the fourth gear 231, the fifth gear 233 and the sixth gear 240, and between the first gear 211 and the second gear 221, So that the same torque can be obtained even if a single-phase motor having the same size as that of the conventional three-phase motor is used. In addition, if the load of the cargo exceeds the set weight by disposing the clutch in the middle of the 3-speed reduction gear, it is possible to prevent the safety accident by disconnecting the gear.

The reduction ratio of the three-stage speed reducer is set to be about twice as large as that in the case of using a three-phase motor in order to obtain the same torque as that of a hoist using a three-phase motor of the same size. In the present embodiment, the reduction ratio of the three-stage reduction gear is set to be 85. [

As described above, in this embodiment, even if a single-phase motor is used by using a three-stage reduction gear to increase the reduction ratio, it is possible to generate the same torque as in the case of using a conventional three-phase motor. In addition, since the size of the single-phase motor can be kept the same as that of the 3-phase motor, it is possible to share the core, so that it can be compatible with the hoist using the existing 3-phase motor. .

In addition, since the hoisting speed of the chain 310 is relatively lowered by the three-stage speed reducer, it is possible to easily adjust the position of the cargo and to suppress the frequent restarting which is necessarily accompanied by the position adjustment of the cargo in the electric hoist, It is possible to reduce the burden imposed.

Particularly, when discharging resistor 540 is connected in parallel to capacitor 510 to rapidly discharge capacitor 510, even if restarting of the motor is much performed, the risk of electric shock due to the residual charge stored in capacitor 510 is prevented And the work stability can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It can be understood that It is to be understood, therefore, that the embodiments described above are illustrative in all aspects and not restrictive.

10: Single-phase chain hoist 100:
110: stator 120: rotor
130: Rotor shaft 140: Motor case
200: decelerator 210: first drive shaft
211: first gear 220: second drive shaft
221: second gear 223: third gear
225: clutch disc 227: clutch spring
230: third drive shaft 231: fourth gear
233: fifth gear 240: sixth gear
250: Reducer case 300:
310: chain 320: chain block
321: load sheave 330: chain box
340: hook 350: bumper
400: Brake part 410: Full rotor
420: movable core 430: brake lining
440: Brake spring 450: Brake case
500: power controller 510: start capacitor
520: a drive capacitor (run capacitor)
530: Start switch 540: Discharge resistance
550: magnetic connector
551: Counter 560: Transformer
561: Fuse 570: Terminal block
580: Power control unit case 600: Upper hook
700: load limiter

Claims (4)

A motor unit 100 having a stator 110, a rotor 120 and a rotor shaft 130,
A decelerator 200 connected to the rotor shaft 130 of the motor unit 100,
A chain portion 300 having a chain 310 and a rod sheave 321 connected to the reduction base portion 200 to hoist the chain 310;
A brake unit 400 capable of rotating and fixing the rotor shaft 130 of the motor unit 100,
And a power control unit 500 having a magnetic connector 550 and a capacitor 510 to control power supplied to the motor unit 100,
A discharging resistor 540 is connected in parallel to the capacitor 510 of the power controller 500,
The motor unit 100 includes a single-phase motor,
The reduction gear unit 200 includes a three-stage reduction gear unit including a clutch,
The three-stage speed reducer of the reduction unit 200 includes a first drive shaft 210 connected to the rotor shaft 130 of the motor unit 100, a first gear 211 installed on the first drive shaft 210, A second gear 221 and a third gear 223 provided on the second drive shaft 220 and spaced apart from the second drive shaft 220. The second drive shaft 220 is spaced apart from the first drive shaft 210, A fourth gear 231 and a fifth gear 233 provided on the third drive shaft 230 and a third drive shaft 230 disposed on the third drive shaft 230 in parallel with the chain portion 300 And a sixth gear 240 coupled to a load sheave 321 of the first gear 211 and the second gear 221. When the motor 100 is driven, the first gear 211, the second gear 221, The second gear 223 and the fourth gear 231, the fifth gear 233 and the sixth gear 240 are combined to perform three-stage deceleration,
The clutch includes a clutch disk disposed on one side of the second gear 221 and a clutch disk for transmitting the elastic force of the clutch spring to the second gear 221 between the second gear 221 and the clutch spring Wherein the hoist is formed by being closely arranged. delete The method according to claim 1,
The power control unit 500 further includes a start switch 530, and the start switch 530 includes a discharge resistor. The method according to claim 1,
Wherein the power control unit 500 further comprises a counter 551 connected to the magnetic connector 550 for counting and displaying the number of operations of the motor unit 100.

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