JPH0723784U - Hoist - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the control circuit of the battery hoist and the battery from being damaged by the reverse connection of the battery and the charger. [Structure] A charging input circuit 5A of a battery 5 is provided with a diode 12 for blocking a reverse voltage, and a power input circuit 4A of a load 4 is provided.
Also, a diode 11 for blocking the reverse voltage is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a battery-driven hoist or a lifter (hereinafter, referred to as a battery hoist) such as a battery-driven care lifter (hereinafter, referred to as a battery partner), and particularly to a control device protection device thereof.

[0002]

[Prior art]

 As shown in FIG. 5, the battery hoist drives the load 4 such as the control circuit 1, the hoisting machine 2 and the traveling machine 3 with the battery 5, and charges the battery 5 with the charger 6 as necessary. , Also replace the battery. Therefore, the battery hoist 9 is provided with a charging battery side terminal 7 for detachably connecting the charger 6 to the battery 5 and a battery connecting terminal 8 for detachably connecting the battery 5 to the load 4. There is. When charging, connect the charger 6 to the charging battery side terminal 7 and remove it after charging is completed. When replacing the battery, the old battery is removed from the battery connection terminal 8 and the new battery is connected.

[0003]

[Problems to be solved by the device]

 However, if the polarities are wrong when the battery 5 and the charger 6 are connected, a voltage of reverse polarity may be applied to the load 4, especially the control circuit 1 or the battery 5, and these may be destroyed. Then, this invention aims at providing the hoist which aimed at protection of a control circuit etc.

[0004]

[Means for Solving the Problems]

 A hoist of the present invention that achieves the above object is a hoist having a battery detachably connected to a charger and a load using the battery as a power source and the battery detachably connected to the hoist. It is characterized by comprising a first diode for blocking a reverse polarity voltage provided in a circuit and a second diode for blocking a reverse polarity voltage provided in a charging input circuit of a battery.

[0005]

[Action]

 When the battery or charger is connected with the correct polarity, current is supplied from the battery to the load, or from the charger to the battery and the load through diodes. When the battery or charger is connected in reverse polarity, the first diode blocks the application of reverse polarity voltage from the battery to the load, and the second diode blocks the application of reverse polarity voltage from the charger to the battery. The first and second diodes also block the application of reverse polarity voltage from the charger to the load.

[0006]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a diagram showing an electric system of a battery hoist according to an embodiment of the present invention. FIG. 2 is a front view of a manual traveling battery partner to which the present invention is applied, FIG. 3 is a side view thereof, and FIG. 4 is a control circuit diagram thereof.

In FIG. 1, a battery hoist 10 includes a control circuit 1, a hoisting machine 2, a traveling machine 3 and the like as a load 4, and a battery 5 is used as a driving power source for these. The battery 5 is detachably connected to the load 4 by connecting to and disconnecting from the pair of battery connecting terminals 8. The charger 6 is detachably connected to the battery 5 and the load 4 by connecting and disconnecting the pair of charging battery side terminals 7. Then, the first diode 11 is connected in the forward direction to the power input circuit 4A of the load 4, that is, the circuit between the battery connection terminal 8 and the load 4, and the charging input circuit 5A of the battery 5, that is, the battery connection terminal 8 and the charging battery side. A second diode 12 is connected between the terminals 7 in the forward direction. With the configuration of FIG. 1, when the battery 5 or the charger 6 is connected with the normal polarity, the current flows from the battery 5 to the load 4 or from the charger 6 to the battery 5 and the load 4 through the diodes 11 and 12, respectively. Supplied. When the battery 5 or the charger 6 is connected with the reverse polarity, the first diode 11 blocks the application of the reverse polarity voltage from the battery 5 to the load 4, and the reverse polarity from the charger 6 to the battery 5 is applied. The second diode 12 blocks the application of the voltage, and the first and second diodes 11, 12 also block the application of the reverse polarity voltage from the charger 6 to the load 4.

Next, a manual traveling type battery partner to which the present invention is applied will be described as a more specific embodiment with reference to FIGS. 2 to 4.

In FIG. 2 and FIG. 3, a suspension type manual traveling device 14 is continuously provided on an upper portion of the hoist body 13, and a pair of wheels 15 and 15 are supported by the frame 16 and are provided as a pair. Is rotatably mounted on, for example, traverse rails 17, 17. The hoist travels by manually pulling the rope 18 attached to the hoist body 13. Inside the hoist body 13, there are a battery 5 shown in FIG. 1, a hoisting machine 2 using a DC motor that uses the battery 5 as a power source, and a control circuit 1 that controls the hoisting machine 2. An attachment 20 of an assisting tool is connected to the rope 19 of the hoist, and operations such as hoisting and lowering of the hoist are performed by each switch of the pendant 21 connected to the control circuit 1 by a cable. .

On the lower surface of the hoist body 13, there are provided a red indicator light 22A as an alarm and a green indicator light 22B for indicating whether or not charging is in progress. The indicator light 22A is normally lit. When a low voltage of the battery is detected by the control circuit, which will be described later, flicker occurs. The indicator light 22B lights up during charging.

On the other hand, a pair of positive and negative charging power source side terminals 23, 23 are installed at predetermined positions along the traveling rails 17, 17 and are urged downward by a spring 24. A pair of positive and negative charging battery side terminals 7 and 7 are provided on the upper surface of the hoist body 13 so as to face the charging power source side terminals 23 and 23. The relationship between the charging power supply side terminals 23 and 23 and the battery side terminals 7 and 7 is such that the two are automatically contacted and electrically connected when the battery partner is in place. And the installation position.

Further, in order to ensure the connection between the charging power source side terminals 23, 23 and the battery side terminals 7, 7 at a predetermined position, a ball plunger 25 is installed in the hoist body 13 so that these balls can be inserted. A receiving member 26 having a recess is installed on the traveling rail 17. This facilitates and reliably stops the battery partner at a predetermined position.

Further, a limit switch 27 is installed on the traveling rail 17, and the limit switch 27 is turned on when the hoist body 13 is in a predetermined position, and the charging power source side terminals 23 and 23 are not directly connected to the direct current from the charger 6 from the charger 6. Electric power is applied. Reference numeral 28 indicates a short circuit terminal.

Next, the control circuit shown in FIG. 4 will be described. In FIG. 4, the coils of two relays RC for charge detection are connected between the charging battery side terminals 7 and 7, and the counter electromotive current absorption diode D is connected in parallel to each coil.₀, D₁It is connected with. Further, between the charging battery side terminals 7 and 7, a second diode (D₂) 12, Fuse F₁ The battery 5 is connected via the battery connection terminals 8 and 8. The battery 5 is composed of two 12-volt batteries connected in series. The reverse connection prevention first diode (D₈) 11 and limiting resistance R₀And relay RC normally open contact RC₁, RC₂A green indicator light 22B (for example, an LED) is connected via. As a result, when the charger 6 is connected to the battery 5 and the charging voltage is applied, the contact RC₁, RC₂Is closed and the green indicator light 22B lights up. If the charger 6 is not connected, the contact RC₁, RC₂Is open, the green indicator light 22B goes out. As the battery voltage, the voltage V at the midpoint of the two batteries_{B / 2}Using a comparator IC₃It is given to the inverting input terminal of. On the other hand, the battery 5 is connected to the first diode 11 and the normally closed contact RC of the relay RC.₃Through the first constant voltage circuit IC₁And connect the output voltage to the variable resistor VR₁And two fixed resistors R₁, R₂And the variable voltage is divided into a predetermined voltage V_REFMake a comparator IC₃It is applied to the non-inverting input terminal of. As a result, the battery voltage V_{B / 2}Is the predetermined voltage V_REFComparator IC while exceeding₃Output is at a low level, but a predetermined voltage V_REFIt becomes a high level below. In addition, contact RC during charging₃Opens and the comparator IC₃Stops working. C₀~ C_FourIs a capacitor. Therefore, the comparator IC₃Resistor R to the output of₃Through transistor T_r1The base of the multi-vibrator 30 is connected to the multi-vibrator 30 to supply power to the multi-vibrator 30 for constant current drive._Four, RC_FiveA red indicator light 22A is connected through. Transistor T_r1The second constant voltage circuit IC connected to the battery 5 via the first diode 11₂To normally closed contact RC of relay RC₆Power is supplied through. As a result, the battery voltage V_{B / 2}Is the predetermined voltage V_REFTransistor T when_r1Is supplied with a sufficiently large current, the multivibrator 30 operates, and the red indicator light 22A blinks to give an alarm. Battery voltage V_{B / 2}Is the predetermined voltage V_REFTransistor T while crossing_r1The electric current supplied from the multi-vibrator 30 is small and the transistor T_r3Only turns on and the red indicator light 22A lights up. In addition, R_FourIs a stabilizing resistor, C_Five~ C₈Is a capacitor. The multivibrator 30 is a transistor T_r2, T_r3And resistor R_Five~ R₈And capacitor C ₉ , C_TenAnd diode D₃It consists of and. Contact point RC during charging_Four~ RC₆Opens and the red indicator light 22A goes out.

On the other hand, the second constant voltage circuit IC ₂ is passed through a hoisting (UP) switch 31 in the pendant 21 and an upper limit switch LS ₁ which is turned off when the upper limit of hoisting is detected. one of the relay R3, connects each coil in parallel of RB3, also similarly pendant 21 under winding (DOWN) switch 32 and detects the lower limit of the lower winding through the lower limit switch LS ₂ off ing two The coils of relays R4 and RB4 are connected in parallel. D _{4 to} D ₇ are diodes for absorbing back electromotive current. The relay R3 is for hoisting, and when the normally open contacts R3, R3 ₂ are closed, a forward current is supplied from the battery 5 to the DC motor 33 of the hoisting machine 2. The relay R4 is for winding, and when the normally open contacts R4 ₁ , R4 ₂ are closed, a reverse current is supplied from the battery 5 to the DC motor 33 of the hoisting machine 2. The relay RB3 is for releasing the brake at the time of winding, and when the normally-open contact RB3 ₁ is closed, current is supplied from the battery 5 to the electromagnetic brake 34 that is normally operating to release the brake. The relay RB4 is for releasing the brake at the time of winding, and when the normally-open contact RB4 ₁ is closed, a current is also supplied to the electromagnetic brake 34 to release the brake. Therefore, winding is performed while the switch 31 is on, winding is performed while the switch 32 is on, and both are stopped while being off.

In the above embodiment, in addition to the reverse connection prevention, when the battery 5 is exhausted and the capacity becomes insufficient, the red indicator light 22A blinks to give an alarm, so that this can be immediately noticed and charging can be performed. it can. In this case, the charging power source side terminals 23, 23 and the battery side terminals 7, 7 are automatically connected only by moving the battery partner to a predetermined position, so that the charging operation is extremely simple. During charging, the green indicator light 22B lights up, indicating that the battery is really charged. Further, in the present embodiment, since the traveling device 14 is of a manual type, even if the battery cannot be hoisted or lowered, the rope 18 is pulled to move the battery partner to a predetermined position. It does not become non-rechargeable.

[0017]

[Effect of device]

 According to the present invention, even if the hoist battery is reversely connected or the battery charger is reversely connected, the load of the control circuit or the battery or the battery is not destroyed.

[Brief description of drawings]

FIG. 1 is a diagram showing an electric system of a battery hoist according to an embodiment of the present invention.

FIG. 2 is a plan view of a manually propelled battery partner according to another embodiment of the present invention.

FIG. 3 is a side view of FIG.

FIG. 4 is a diagram showing an example of a control circuit.

FIG. 5 is a diagram showing a conventional technique.

[Explanation of symbols]

 1 Control Circuit 2 Hoisting Machine 3 Traveling Machine 4 Load 4A Power Input Circuit 5 Battery 5A Charging Input Circuit 6 Charger 7 Charging Battery Side Terminal 8 Battery Connection Terminal 10 Battery Hoist 11 First Diode 12 Second Diode

Claims (1)

[Scope of utility model registration request] 1. A reverse polarity voltage provided in a power supply input circuit of a load in a hoist having a battery detachably connected to a charger and a load using the battery as a power source and detachably connected to the battery. A hoist comprising a blocking first diode and a reverse polarity voltage blocking second diode provided in a charging input circuit of a battery.