CN102120550B - Brake control device for hoisting machine - Google Patents

Brake control device for hoisting machine Download PDF

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Publication number
CN102120550B
CN102120550B CN201110005762.7A CN201110005762A CN102120550B CN 102120550 B CN102120550 B CN 102120550B CN 201110005762 A CN201110005762 A CN 201110005762A CN 102120550 B CN102120550 B CN 102120550B
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China
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coil
disc
rectification
electrical motor
brake
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CN102120550A (en
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柴田航
家重孝二
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Priority to JP2010001642A priority Critical patent/JP5568319B2/en
Priority to JP2010-001642 priority
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Publication of CN102120550A publication Critical patent/CN102120550A/en
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Abstract

The invention provides a brake control device for a hoisting machine, the brake control device inhibits temperature rising of an electromagnetic brake of a hoisting machine, and improves durability of the electromagnetic brake. The hoisting machine is provided with a sprocket wheel (13) hoisting and lowering hosting load, the sprocket wheel (13) is driven by an alternating current motor (23), an output shaft (24) of the motor (23) is provided with an electromagnetic brake (27). The electromagnetic brake (27) is provided with a rotating disk (32) connected with the output shaft (24) and an arresting disc (33) arresting the rotating disk (32), and is provided with a coil (28) drawing the arresting disk (33) to a direction far away from the rotating disk (32) during driving of the motor (23). An applied voltage during brake startup and making the arresting disk away from the rotating disk (32) is higher than a voltage applied upon the coil (26) in a state of brake drawing.

Description

The braking force control system of winch
Technical field
The present invention relates to the braking force control system of the winch that the magnet stopper to installing in the winchs such as electric chain hoist controls.
Background technology
For making goods hang the winch that lotus moves up and down, there are electric chain hoist and hoisting crane etc.Electric chain hoist is provided with the sprocket wheel of load bearing chain by bogie, make to be arranged on the lower hook that the suspended cargo of an end of load bearing chain uses and move up and down carry out the elevator of goods and fall, it is in chain bucket that the other end of load bearing chain is incorporated in the chain collector that is arranged at winch main body.Hoisting crane is wound with the reel of cable by driving, make to be arranged on the lower hook that the suspended cargo of the bottom of cable uses and move up and down carry out the elevator of goods and fall.Sprocket wheel and reel are rotarilyd actuate by electrical motor, and in most winch, use sense induction motor is as electrical motor.
In such winch, exist with constant speed and hang the elevator of lotus and the type of falling, and the type that each speed is changed according to operator's switching manipulation.In making the type of velocity variations, as patent documentation 1 is recorded, in order to make the rotation speed change of electrical motor, electrical motor is carried out to frequency conversion (inverter) and control.
Patent documentation 1: Japanese kokai publication hei 10-291783 communique
Summary of the invention
In order to lock the output shaft of electrical motor, in winch main body, magnet stopper is installed.When the action of this magnet stopper, output shaft is locked, for example, can stop hanging moving up and down of lotus by hanging lotus and suspend in midair under the state of height of regulation.Magnet stopper has the rotating disc that the conduct being arranged on axle drive shaft is stopped the brake disc of side, with configuration relative with this rotating disc as the arresting disc of the brake disc of stop side ( デ ィ ス Network), arresting disc approaches away from moving relative to rotating disc under the confined state of rotation.By spring members, arresting disc is applied the elastic force of the direction being adjacent to rotating disc.In order to make arresting disc away from rotating disc, make to be provided with the electromagnet of coil and arresting disc in abutting connection with configuration.Thus, when coil electricity, arresting disc is subject to that away from rotating disc, magnet stopper becomes open state with the counteractive attraction of elastic force.On the other hand, when stopping coil electricity, arresting disc is adjacent to by elastic force and rotating disc, and magnet stopper becomes arrested state, and output shaft is locked.
As magnet stopper, use the DC electromagnetic brake of coil being supplied with to DC current.For the electric power of coil, make the alternating current branch to electrical motor supply from external power supply, and rectification is that DC current is supplied with.
When using winch hang the elevator of lotus and fall operation, in order to make magnet stopper become open state, to coil sustainable supply electric current, therefore, when attracting the state of arresting disc, the temperature of magnet stopper rises.If the temperature while suppress attracting arresting disc that magnet stopper is remained to open state rise, and reduce the voltage that coil is applied, the arresting disc under the state that makes to be adjacent to rotating disc during away from rotating disc open meeting run up time of drg elongated.
If open run up time is elongated, for mobile, hang lotus, from electrical motor, being energized to magnet stopper becomes open state completely and needs the time, and under the state of arresting disc contact rotating disc, electrical motor just starts rotation.Therefore, exist the wearing and tearing that are arranged on the brake lining on each dish to occur in advance, the problem that the durability of winch reduces.
The object of the invention is to, when the temperature that suppresses the magnet stopper of winch rises, improve the durability of magnet stopper.
The invention provides a kind of braking force control system of winch, this winch has the electrical motor to the swivel that hangs lotus elevator and fall is driven, the output shaft of this electrical motor is switched between arrested state and stop open state, the braking force control system of this winch is characterised in that, have: magnet stopper, it comprises the rotating disc linking with above-mentioned output shaft, relative to this rotating disc, freely approach away from the arresting disc moving, this arresting disc is applied to the spring members of elastic force towards above-mentioned rotating disc, with the coil when driving above-mentioned swivel, above-mentioned arresting disc being attracted to the direction away from above-mentioned rotating disc, rectifying circuit, is direct current by the AC rectification that above-mentioned electrical motor is supplied with, and to above-mentioned coil, supplies with, with rectification Phase-switching unit, at above-mentioned arresting disc, finished under the braking attraction state away from the action of above-mentioned rotating disc, compare when making above-mentioned arresting disc away from the brake actuating of above-mentioned rotating disc, reduce the rectification composition of the alternating current that carries out rectification, the braking force control system of above-mentioned winch, under the above-mentioned braking attraction of the voltage ratio state while making above-mentioned brake actuating, above-mentioned coil being applied to apply voltage high.The braking force control system of winch of the present invention, for the three-phase alternating current of supplying with to above-mentioned electrical motor, when above-mentioned brake actuating, carry out half wave rectification or biphase rectification, or single-phase or two cross streams in three-phase alternating current are carried out to biphase rectification, to above-mentioned coil, apply, and under above-mentioned attraction state, above-mentioned single phase A.C. is carried out to half wave rectification, to above-mentioned coil, apply.
According to the present invention, make to will hanging the alternating current branch of the electrical motor supply of lotus elevator and the swivel of falling for driving, carry out being supplied to after rectification the magnet stopper of direct current, by the voltage that makes when magnet stopper starts, coil to be applied, higher than the voltage under attraction state, coil being applied, that can accelerate magnet stopper openly starts action.Thus, because eliminated the action gap of electrical motor and magnet stopper, move delay, so can reduce the wearing and tearing of brake lining, improve the durability of magnet stopper.In addition, by the voltage that makes coil apply under attraction state, when starting, the temperature that can suppress magnet stopper rises, and improves the durability of magnet stopper.
Accompanying drawing explanation
Fig. 1 means the front elevation as the electric chain hoist of the winch of an embodiment of the invention.
Fig. 2 is the right side view of Fig. 1.
Fig. 3 is the amplification sectional view of the winch main body shown in Fig. 1.
Fig. 4 means the amplification sectional view of the magnet stopper shown in Fig. 3.
Fig. 5 is the A-A line amplification sectional view of Fig. 3 under the state of engagement releasing of ratchet and pawl of mechanical brake.
Fig. 6 means the amplification sectional view of part identical with Fig. 5 under the state of ratchet and pawl engagement of mechanical brake.
Fig. 7 means the block diagram of the control setup of the action of controlling magnet stopper.
Fig. 8 means the sequential chart of the action sequence of magnet stopper and electrical motor when hanging the elevator running of lotus and falling running.
Fig. 9 means the received current of rectifying circuit and the sequential chart of outgoing current when magnet stopper starts and while attracting.
Description of reference numerals
10 ... winch main body, 11 ... shell, 13 ... sprocket wheel (swivel), 14 ... load bearing chain, 15 ... lower suspender, 17 ... operation inputting part, 21 ... sprocket shaft, 23 ... electrical motor, 24 ... output shaft, 27 ... magnet stopper, 28 ... coil, 32 ... rotating disc, 33 ... arresting disc, 36 ... compression disc spring, 37a, 37b ... brake lining, 50 ... mechanical brake, 51 ... threaded portion, 52 ... dish portion, 53 ... brake disc, 55 ... spragging gear, 57 ... ratchet, 60 ... ratchet, 61 ... power supply, 62 ... controller, 63 ... rectifying circuit, 64 ... timer.
The specific embodiment
Below, based on accompanying drawing, describe embodiments of the present invention in detail.As depicted in figs. 1 and 2, the electric chain hoist as winch has winch main body 10.Winch main body 10 has shell 11, and at the upper portion of the length direction central authorities of this shell 11, being provided with rises to the bait goes up suspender 12, and winch main body 10 is used under the state by 12 suspentions of suspender on this.In shell 11, as the sprocket wheel 13 of swivel, can rotate freely the downside that is installed on upper suspender 12 as shown in phantom in Figure 2, at the added load bearing chain 14 that is provided with of this sprocket wheel 13.In an end of this load bearing chain 14, be provided with lower hook and descend suspender 15, on this lower suspender 15, Suspended Cargo hangs lotus.
By rotariling actuate sprocket wheel 13, the lotus elevator that hangs that makes to be suspended on lower suspender 15 moves or falls movement.As depicted in figs. 1 and 2, at shell 11, being provided with for accommodating the chain collector of the other end side of load bearing chain 14 is chain bucket 16, and when hanging lotus by elevator, the other end side of load bearing chain 14 enters in chain bucket 16, when hanging lotus and being fallen, load bearing chain 14 is from the interior extraction of chain bucket 16.In winch main body 10, by cable 18, be connected with operation inputting part 17, operator uses switch with switch with falling at the elevator of operation inputting part 17 by operation setting, hangs the elevator action of lotus and falls action.
As shown in Figure 3, sprocket wheel 13 is fixed in the sprocket shaft 21 of hollow, and the both ends of this sprocket shaft 21 are by bearing 22 supportings that are arranged on shell 11, and sprocket shaft 21 can rotate freely and be arranged in shell 11.In shell 11, the induction type electrical motor 23 of the side on the length direction that relative sprocket wheel 13 is positioned at winch main body 10 is installed, the epitrochanterian output shaft 24 that is fixed on electrical motor 23 is outstanding laterally from the both ends of the surface of electrical motor 23.It is bearing 26 supportings on support 25 that an outstanding end 24a of output shaft 24 is arranged in the mode that can rotate freely the back plate that is fixed on shell 11, at support 25, magnet stopper 27 is installed.
This magnet stopper 27, as shown in Figure 4, coil 28 has the helical bobbin carriage (solenoid case) 29 of installing in the form of a ring, and this helical bobbin carriage 29 is installed on support 25 by many pipe links 31.Between support 25 and helical bobbin carriage 29, in the mode relative with support 25, disposing the brake disc that is stopped side is rotating disc 32, and this rotating disc 32 is fixed on the outstanding end 24a of output shaft 24 as shown in Figure 3 by fixed cells such as splines.Between rotating disc 32 and helical bobbin carriage 29, relative with rotating disc 32 and relatively its freely to approach away from the brake disc that disposes movably stop side be arresting disc 33.In being formed at the through hole 34 of this arresting disc 33, connect pipe link 31, arresting disc 33 is connected bar 31 guiding under the state by pipe link 31 restricting rotations, axially moves.
Core at helical bobbin carriage 29 is provided with spring box 35, in this spring box 35, as spring members, is provided with arresting disc 33 is applied to the compression disc spring 36 towards the elastic force of rotating disc 32 directions.Both sides at rotating disc 32, be provided with as shown in Figure 4 brake lining 37a, 37b, when the elastic force by compression disc spring 36 is by arresting disc 33 during towards rotating disc 32 pushing, arresting disc 33 and rotating disc 32 are adjacent to across brake lining 37a, 37b and support 25, and output shaft 24 is locked.
Thereby, to forming electromagnet, be that solenoidal coil 28 stops under the state of energising, under the effect of elastic force, arresting disc 33 is adjacent to across brake lining 37a and rotating disc 32, and rotating disc 32 is adjacent to across brake lining 37b and support 25, so thereby output shaft 24 is locked by support 25 stop by rotating disc 32, magnet stopper 27 becomes arrested state.On the other hand, when coil 28 energising, arresting disc 33 by magnetic force and elastic force counteraction towards coil 28, attracted, arresting disc 33 is away from rotating disc 32, magnet stopper 27 becomes the open state that allows output shaft 24 to rotate.
As shown in Figure 3, another outstanding end 24b of the output shaft 24 of electrical motor 23, can be installed on the bearing 41 of shell 11 by free rotary ground supporting, and output shaft 24 links by joint 43 and the axle drive shaft 42 that can rotate freely the inside that is arranged on sprocket shaft 21.This axle drive shaft 42 forms a part for output shaft 24, and its leading section is installed in bearing 44 supportings of shell 11.
At shell 11, by bearing 46, the deboost axle 45 that can rotate freely is installed abreast with axle drive shaft 42, be arranged on the miniature gears 47 and big gear wheel 48 engagements that are arranged on the end of deboost axle 45 of the leading section of axle drive shaft 42.By this miniature gears 47 and big gear wheel 48, form and the rotation of axle drive shaft 42 is slowed down and be passed to the speed reduction gearing 49 of deboost axle 45.
In the outside of sprocket shaft 21, mechanical brake 50 is installed.This mechanical brake 50 has by columnar threaded portion 51 and is arranged on the brake disc 53 that the dish portion 52 of an end of this threaded portion 51 forms as one.Brake disc 53 is fixed on sprocket shaft 21 by being arranged on the fixed cells such as spline of the inner peripheral surface of threaded portion 51.
Mechanical brake 50 is compared and can be obtained larger brake torque with the magnet stopper 27 moving by electromagnetic force.By except magnet stopper 27, in sprocket wheel 13 sides, be that load-side arranges this mechanical brake 50, even if larger load is applied to sprocket wheel 13, also can limit reliably the rotation of sprocket wheel 13.
In threaded portion, 51 outer peripheral face is formed with male thread 54a, and this male thread 54a screws togather with the spragging gear 55 that is formed with female thread 54b.This spragging gear 55 and link gear 56 engagements that are arranged on deboost axle 45, the output of axle drive shaft 42 is passed to spragging gear 55 by deboost axle 45.Spragging gear 55 is larger than the diameter that links gear 56, and the rotation of deboost axle 45 is slowed down, and is passed to spragging gear 55.
The end face of spragging gear 55 is relative with dish portion 52, between spragging gear 55 and dish portion 52, can rotate freely ratchet 57 is installed.In dish portion 52, be provided with brake lining 58a, end face at spragging gear 55 is provided with brake lining 58b, when the direction that approaches dish portion 52 relative to brake disc 53 to stop direction when spragging gear 55 is rotated relatively, both brake lining 58a, 58b and ratchet 57 are adjacent to, and mechanical brake 50 becomes arrested state.Thus, brake disc 53 and spragging gear 55 become the state of stop by ratchet 57.On the other hand, when spragging gear 55 is when brake disc 53 rotates away from the direction of dish portion 52 relatively to the direction of removing stop, the stop of brake disc 53 and spragging gear 55 is removed, and mechanical brake 50 becomes open state.
Like this, when spragging gear 55 is when brake disc 53 rotates relatively, because spragging gear 55 screws togather with the threaded portion 51 of brake disc 53, so spragging gear 55 axially moves between stop position and release position relative to brake disc 53.The open limit position of spragging gear 55, by block 59 restrictions that are arranged on the front end of threaded portion 51.
When making electrical motor 23 hang the elevator running of lotus by forward direction rotation, open magnet stopper 27, rotarilys actuate output shaft 24 by electrical motor 23 as shown by the arrows in Figure 3 in forward direction.Thus, because spragging gear 55 by deboost axle 45 to driving with the stop direction rotation of output shaft 24 equidirectionals, spragging gear 55 is braked dish 53 stop by ratchet 57, by the output shaft 24 driving to elevator direction, sprocket wheel 13 is driven to elevator direction, the lotus that hangs being suspended on lower suspender 15 is erected at load bearing chain 14 elevators on sprocket wheel 13.
Fig. 5 and Fig. 6 are the A-A line amplification sectional view of Fig. 3.When the output shaft of electrical motor 23 24 is driven to forward direction, because deboost axle 45 drives to the elevator direction rotation shown in arrow U1 in Fig. 5, so spragging gear 55, by relative brake disc 53 stop of ratchet 57, drives to the direction rotation shown in arrow U2.Thus, sprocket wheel 13 drives to elevator direction, and the elevator that hangs lotus that carries out being suspended in midair by load bearing chain 14 turns round.Wherein, in Fig. 5 and Fig. 6, with solid line, represent the outer radial line of spragging gear 55 and link gear 56, with long and short dash line, represent nodel line.
As shown in Figure 5 and Figure 6, at shell 11, the ratchet 60 meshing with ratchet 57 can be freely joltily installed, in the direction front end of ratchet 60 being contacted at the outer peripheral face with ratchet 57 by not shown spring members, apply elastic force.When ratchet 60 falls direction rotation at ratchet 57 along arrow D2 direction, as shown in Figure 6, with ratchet 57 engagements, stop ratchet 57 along the direction rotation shown in arrow D2.
When hanging lotus by under while stopping hanging the moving up and down of lotus under the state of suspender 15 suspention, stop electrical motor 23 to supply with electric power, and stop magnet stopper 27 to supply with electric power, make magnet stopper 27 for arrested state.Now, as shown in Figure 6, ratchet 60 and ratchet 57 engagements, sprocket shaft 21 is locked.; now, the heavy burden of hanging lotus applies rotational force to sprocket shaft 21 falling direction D2, and the rotation of output shaft 24 is stopped by magnet stopper 27; ratchet 57 becomes by the state of dish portion 52 stop by spragging gear 55, and the heavy burden of therefore hanging lotus applies the rotational force of falling direction D2 to sprocket shaft 21.Thus, as shown in Figure 6, ratchet 60 and ratchet 57 engagements, sprocket wheel 13 is locked, and rotation is restricted.Therefore open magnet stopper 27 like this, by mechanical brake 50, makes sprocket shaft 21 lockings, even if also can prevent that hanging lotus falls.
On the other hand, when electrical motor 23 is reversed hang lotus fall running time, coil 28 is supplied with to electric power, open magnet stopper 27, utilizes electrical motor 23 that output shaft 24 is rotarilyd actuate by reverse direction.Now, by hanging lotus, sprocket shaft 21 is being applied under the state of the rotational force of falling direction, output shaft 24 is driven to falling direction, and deboost axle 45 is rotarilyd actuate to falling direction D1.Thus, spragging gear 55 rotates to the direction of removing stop relatively relative to brake disc 53, and mechanical brake 50 becomes open state.Thereby, even if ratchet 60 becomes as illustrated in fig. 6 the state with ratchet 57 engagements, also can releasing dish portion 52 and being adjacent to of 55 pairs of ratchets 57 of spragging gear, by hanging the heavy burden of lotus, sprocket shaft 21 is driven to falling direction rotation.
When hang the rotative speed of falling direction that lotus applies sprocket shaft 21 higher than electrical motor 23 fall the rotative speed of direction time, spragging gear 55 is relative rotation in the direction that ratchet 57 is adjacent to dish portion 52.Thus, as shown in Figure 6, the rotation that limits sprocket shaft 21 by the ratchet 57 under the state with ratchet 60 engagements is locked.Like this, the opening operation of the mechanical brake 50 that the rotation of falling direction of electrical motor 23 brings carries out repeatedly with the braking maneuver of the mechanical brake 50 that the heavy burden of hanging lotus causes, limit is slided the relative ratchet 57 of brake lining 58a, 58b, and fall with the state of roughly synchronizeing with the rotation of output shaft 24 hanging lotus on limit.At this, fall when motion, mechanical brake 50 repeats the opening operation being brought by output shaft 24 and the braking maneuver being caused by the heavy burden of hanging lotus, and therefore can not apply by the rotational force that hangs the reverse direction that lotus causes to output shaft 24 be rotary torque.
But, when starting to fall running, if ratchet 60 is the state in not having to mesh with ratchet 57 as shown in Figure 5, until ratchet 60 and ratchet 57 are meshed as illustrated in fig. 6 by falling running, mechanical brake 50 is all the state of being failure to actuate, and the rotational force that output shaft 24 is applied to reverse direction is rotary torque.
As shown in Figure 3, this winch also possesses mechanical brake 50 except magnet stopper 27, but the lotus that hangs for to light weight comparatively, carry out elevator and fall the small-sized winch of operation, also can only carry magnet stopper 27, not carrying mechanical brake 50.
Fig. 7 means the block diagram of the control setup of the action of controlling magnet stopper 27.The power supply 61 of supplying with the alternating current of three-phase is supplied to electrical motor 23 by controller 62, and this electrical motor 23 is the alternating-current motor/AC motors by the induction type of the alternating current driving of three-phase.Signal to controller 62 inputs from operation inputting part 17, the elevator running of hanging lotus during the operating switch of using at the elevator of operation inputting part 17 in operator's operation setting, the running of falling of hanging lotus while operating the operating switch of falling use.During elevator running, electrical motor 23 is supplied with the electric power of forward direction, while falling running, electrical motor 23 is supplied with the electric power of reverse direction.
The electric power that utilization is supplied with electrical motor 23 makes magnet stopper 27 actions.Magnet stopper 27 is magnet stoppers of the direct current that moves by DC current, and for by the alternating current rectification that electrical motor 23 is supplied with the coil 28 that is supplied to magnet stopper 27, controller 62 is connected with rectifying circuit 63.
Magnet stopper 27, as mentioned above, when hanging the elevator running of lotus and falling running, sets open state for by coil 28 is supplied with to electric power.If so that set with the action mode that (timing) is identical constantly of electrical motor 23 voltage that magnet stopper 27 is applied the run up time of magnet stopper 27, at magnet stopper 27, continue to attract on the basis of attraction state of arresting disc 33, on coil 28, voltage is excessive, the heat producing increases, and the temperature of magnet stopper 27 rises and increases.Therefore, need to make the size of magnet stopper 27 maximize.
On the other hand, if make magnet stopper 27 miniaturizations suppress to apply voltage, the run up time of magnet stopper 27 is elongated.Therefore, when magnet stopper 27 starts, to compare with the action of electrical motor 23, it is slow that the opening operation of magnet stopper 27 can become, the output shaft 24 of electrical motor 23 keeps just starting to rotate under half braking state at magnet stopper 27, the wearing and tearing that can produce brake lining 37a, 37b.
So, when when magnet stopper 27 starts, arresting disc 33 is away from rotating disc 32, during the startup that makes the coil 28 apply, apply voltage ratio finish this away from action, utilize coil 28 to continue to attract the voltage of the attraction state of arresting disc 33 to increase.Thus, can shorten run up time, and under attraction state, suppress the heating of coil 28.
Therefore, as shown in Figure 7, by controller 62, supplied with the rectifying circuit 63 of the alternating current of three-phase, half wave rectification by three-phase when magnet stopper 27 starts is transformed into direct current coil 28 is applied, on the basis of the state of attraction, the single phase A.C. in three-phase alternating current is carried out to half wave rectification, coil 28 is applied.Rectifying circuit 63 possesses the rectifying circuit with diode etc. that carries out half wave rectification, for switching the timer of the rectification Phase-switching unit of the rectification of three-phase alternating current and the rectification of single phase A.C., after finishing, magnet stopper 27 startups switch to attraction state through specific time with conduct.But, also can, by the switch that detects the position of arresting disc 33 is arranged on to magnet stopper 27 as rectification Phase-switching unit, while detecting arresting disc 33 away from rotating disc 32 after the Phase-switching time t through regulation, switch to attraction state.
Fig. 8 means the sequential chart of the action sequence of magnet stopper 27 and electrical motor 23 when hanging the elevator running of lotus and falling running.Fig. 9 means the received current of rectifying circuit 63 and the sequential chart of outgoing current when magnet stopper 27 starts and while attracting.
As shown in Figure 8, to the elevator of operation inputting part 17 with switch or after falling and operating with switch, electrical motor 23 and magnet stopper 27 are supplied to electric power.Thus, under the open state of magnet stopper 27, sprocket wheel 13 is driven by electrical motor 23.Magnet stopper 27 is started, while making arresting disc 33 resist elastic force away from the startup of rotating disc 32, by 63 pairs of three-phase alternating currents of rectifying circuit, carrying out half wave rectification as shown in Figure 9, be applied on the coil 28 of magnet stopper 27.Then, after arresting disc 33 is away from rotating disc 32, as shown in Figure 9, utilize 63 pairs of single phase A.C. compositions of rectifying circuit to carry out half wave rectification, coil 28 is applied.The switching of the phase component of rectification, is being carried out through after Phase-switching time t by the timer 64 as rectification switch unit being arranged in rectifying circuit 63.
Switch as described above rectification composition, to magnet stopper 27, when starting, apply the voltage higher than attraction state, can shorten the run up time of magnet stopper 27.On the other hand, low during applying voltage ratio and start under attraction state, the temperature that can suppress coil 28 under attraction state rises.
In the above-described embodiment, when starting, the three-phase alternating current of supplying with to electrical motor 23 from power supply 61 is carried out to half wave rectification, be applied on coil 28, after starting, utilize the timer 64 as rectification switch unit, after the Phase-switching time t through regulation, single phase A.C. is carried out to half wave rectification, be applied on coil 28.Like this, coil 28 is applied to the voltage of setting by the mode that reduces rectification composition, keep attraction state.
As rectifying circuit 63, there is the mode with full-wave rectifying circuit and half-wave rectifying circuit.In such mode, have and when drg starts, three-phase alternating current is carried out to biphase rectification and be then applied to the type on coil 28, two phase constituents in three-phase alternating current composition are carried out to biphase rectification and be then applied to the type on coil 28, and single-phase composition is carried out to biphase rectification be then applied to the type on coil 28.In each mode, under attraction state, by half-wave rectifying circuit, single phase A.C. is carried out to half wave rectification, be applied on coil 28.In these modes, select which kind of mode, be according to exporting to select with the maximum of hanging lotus of carrying out elevator running and the falling running corresponding electrical motor that bears a heavy burden.
Making the lifting-speed of winch and falling in the mode of velocity variations, in order to make the rotation speed change of electrical motor 23, at control setup, be equipped with frequency converter.In having the winch of frequency converter, electrical motor 23, as shown in long and two-short dash line in Fig. 8, by slowly improve the frequency to its supply when electrical motor 23 starts, improves the rotating speed of output shaft 24.When stopping the rotation of electrical motor 23, the rotation of output shaft 24 reduces gradually.Like this, as winch, also have the mode of the rotation speed change that makes electrical motor 23, in this situation, not only when starting or when electrical motor stops, elevator running and each speed in running fallen are also along with operator is switched the operation of operation push-button.
The invention is not restricted to above-mentioned embodiment, can in the scope that does not depart from its purport, carry out various changes.For example, above-mentioned winch is to have set up the sprocket wheel 13 of the load bearing chain 14 as cable wire that is provided with lower suspender 15 as the electric chain hoist of swivel, but also can apply the present invention to hoisting crane.In hoisting crane, there is reel as the swivel that has set up the cable as cable wire that is provided with lower suspender, for driving the output shaft of the electrical motor of reel, with electric chain hoist, magnet stopper is similarly set.In addition, as the mode of controller of controlling the action of electrical motor 23 and magnet stopper 27, also can adopt to there is microprocessor, by the software being stored in ROM, switch the mode of rectification phase place, and not use microprocessor, there is the discrete mode of switchgear.

Claims (2)

1. the braking force control system of a winch, this winch has the electrical motor to the swivel that hangs lotus elevator and fall is driven, the output shaft of this electrical motor is switched between arrested state and stop open state, and the braking force control system of this winch is characterised in that to have:
Magnet stopper, it comprises the rotating disc linking with described output shaft, relative to this rotating disc, freely approach away from the arresting disc moving, this arresting disc is applied to the spring members of elastic force towards described rotating disc, and the coil when driving described swivel, described arresting disc being attracted to the direction away from described rotating disc;
Rectifying circuit, is direct current by the AC rectification that described electrical motor is supplied with, and to described coil, supplies with; With
Rectification Phase-switching unit, has finished under the braking attraction state away from the action of described rotating disc at described arresting disc, compares when making described arresting disc away from the brake actuating of described rotating disc, reduces the rectification composition of the alternating current that carries out rectification,
The braking force control system of described winch, brake described in the voltage ratio while making described brake actuating, described coil being applied under attraction state to apply voltage high.
2. the braking force control system of winch as claimed in claim 1, is characterized in that:
For the three-phase alternating current of supplying with to described electrical motor, when described brake actuating, carry out half wave rectification or biphase rectification, or single-phase or two cross streams in three-phase alternating current are carried out to biphase rectification, to described coil, apply, and under described attraction state, described single phase A.C. is carried out to half wave rectification, to described coil, apply.
CN201110005762.7A 2010-01-07 2011-01-07 Brake control device for hoisting machine Active CN102120550B (en)

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JP2010001642A JP5568319B2 (en) 2010-01-07 2010-01-07 Brake control device for hoisting machine
JP2010-001642 2010-01-07

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CN102120550B true CN102120550B (en) 2014-11-26

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