JPH0124035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is intended for use in manufacturing and assembly factories that are equipped with electric chain blocks, electric trolleys, electric saddles, etc. and handle relatively heavy objects, for example. The two ends of the beam are connected and fixed to the saddles supported by each running rail, the trolley is supported by the beam that is horizontally suspended at an appropriate height, the chain block is suspended from the trolley, and the chain block is suspended from the trolley. The saddle is moved back and forth along the traveling rail, the trolley is moved left and right along the beam, and the chain block is moved back and forth and left and right to lift and lower cargo at any desired position. Regarding equipment for cargo handling work, a forward rotation limit switch installed between a forward rotation switch of a reversible motor and a drive power source is connected to the drive power source via a reverse rotation limit switch, and when the forward rotation limit switch is activated, only the forward rotation switch is activated. It is constructed so that the forward rotation and reverse rotation switches are held in a non-conductive state when the reverse limit switch is activated. For example, during the drive of a reversible motor such as an electric chain block, an electric trolley, and an electric saddle, the reverse rotation switch is welded and becomes constantly conductive. By maintaining the above-mentioned state, the reversible motor is turned off by turning off the reverse limit switch while the chain block is in the maximum extended state with the load hanging hook side of the load chain, and the trolley and saddle are moved to the storage standby position. It is possible to stop and hold the chain block, trolley and saddle in a posture position that is most convenient for repair, and to safely perform repair work on chain blocks, trolleys, saddles, etc. that are installed at relatively high places such as the ceiling of a factory. To provide a drive device for a cargo handling machine which can prevent inconvenient operations such as lifting a load on a chain block when a reversing switch for lowering the load is welded, and can be handled safely and easily. This is what I am trying to do.

Embodiments of the present invention will be described in detail below based on the drawings. As shown in FIGS. 1 to 3, a pair of left and right running rails 3, 3 are installed approximately parallel to construction supports 1 of a factory etc. via beam members 2, and both ends of an H-shaped steel beam 4 are installed. Electric saddles 5, 5 for connecting and fixing are placed on each rail 3, 3. The saddle 5 is provided with wheels 6 to be fitted on the rails 3 and a reversible motor 7 for driving the wheels 6, and the beam 4 is moved back and forth by rotating the motor 7 forward and backward. In addition, the electric trolley 8 is supported by the beam 4 horizontally suspended at an appropriate height, and
Wheels 9 to be fitted to the beam 4, and the wheels 9
The trolley 8 is equipped with a reversible motor 10 that drives the trolley 8.
is formed so that it moves from side to side. Further, an electric chain block 14 is suspended from the lower end of the main body frames 13, 13 of the trolley 8 via a support shaft 11 and a hanging metal fitting 12, so as to be able to swing freely back and forth and from side to side.
Load chain 16 with load hanging hook 15
A reversible motor 17 for hoisting and lowering the chain 16, a power distribution box 18 for controlling the motor 17, and an operation switch box 20 suspended from the box 18 via a wiring cable 19 are connected to the chain block 14. Prepare for. Forward/reverse manual operation switches 21 and 22 for moving the reversible motor 17 of the chain block 14 in the forward and reverse directions to raise and lower the hook 15; Reverse manual operation switches 23 and 24, and a forward/reverse manual operation switch 2 that rotates the reversible motor 7 of the saddle 5 in the forward and reverse directions to move the saddle 5 back and forth.
5 and 26 are provided in the operation switch box 20, and are configured to carry out cargo handling operations such as lifting and lowering of cargo using the chain block 14 and moving the cargo back and forth and left and right using the saddle 5 and trolley 8. .

As shown in FIGS. 4 and 5, the drive shaft 2 of the reversible motor 10 of the chain block 14
A small-diameter first gear 28 is formed at 7, a large-diameter second gear 29 is always meshed with the first gear 28, and a left-handed thread 3 is attached to a rotating shaft 30 that supports the second gear 29.
1, the second gear 29 is screwed and pivotally supported by the left-hand thread 31 thereof, and the brake hub 32 is fixed to the rotating shaft 30 in the direction opposite to the second gear 29, and the second gear 29 and Friction plates 33 and 34 are interposed between the brake hub 32, and a ratchet wheel 35 is provided in a hook-like manner, and a pawl 36 for engaging and disengaging is attached to the ratchet wheel 35.
A rotating shaft 30 with a left-hand screw 31 screwed into the second gear 29
The rotation of the ratchet wheel 35 in the same direction as the rotation direction of the load chain 16 is prevented, and the load chain 16 can be fixedly maintained in a state where the load is suspended from the hook 15 at the tip of the load chain 16. Further, a small-diameter third gear 37 is formed on the rotating shaft 30, and a cylindrical shaft 38 is supported on the same axis as the drive shaft 27.
A large-diameter fourth gear 39 that meshes with the chain wheel 7 and a chain wheel 40 that meshes with the road chain 16 are integrally formed on the cylindrical shaft 38, and the main body frames 41, 4 below the chain wheel 40 are formed integrally with the cylinder shaft 38.
A chain guide 43 is provided between the two, and a limit switch box 44 is attached to the outside of one main body frame 41.

As shown in FIGS. 6 and 7, a rectangular frame 45, bolts 46 fixed to the frame 45,
A boss 48 through which the sensing shaft 47 is inserted and fixed using the long hole 4 of the frame 45.
The chain guide 43 is constituted by the lifting and lowering guide tubes 53 and 54, which are attached by loosely inserting pins 51 and 52 into the chains 9 and 50. Both sides are inserted into the cross-shaped holes 55, 56 of the guide tubes 53, 54, and the load chain 16 is inserted into the guide tubes 53, 54.
Stoppers 57, 58 are attached to both ends, and buffer springs 59, 60 are wound around both ends of the chain 16, so that the stoppers 57, 58 are guided through the springs 59, 60 when the load chain 16 is operated at its upper and lower limits. It is formed so as to come into contact with the cylinders 53 and 54. Further, a sensing bracket 61 that supports the sensing shaft 47 is fixed to the outside of the main body frame 41, and the shaft 47 is fixed to the sensing shaft 47 via a swing regulating link 62 fixed to the sensing shaft 47.
The supporting force of the horizontal maintenance spring 63 is applied to the horizontal support spring 63 to raise and lower the load chain 16 while supporting the chain guide 45 substantially horizontally, and the forward/reverse operation limit switches 64, 6
5, and second and third rotary switches 71 and 72, which have forward/reverse limit switches 67, 68 and 69, 70.
and fixed to the sensing bracket 61,
The bracket 61 and each rotary switch 6
6, 71, and 72 are built into the limit switch box 44.

As shown in FIGS. 8 to 10, the fixed contact 73
... and a movable contact 74... are respectively provided in each of the limit switches 64, 65, 67, 68, 69, 70, and a spring 75 force is applied to the movable contact 74 to press the movable contact 74 to the fixed contact 73. 1
The rotary switch 66 includes a first cam 76 having a long cam floor and a second and third cam 76 having a large fan shape.
Narrow fan-shaped second and third cams 77 having short cam floors provided for rotary switches 71 and 72;
78 is engaged and pivotally supported by the sensing shaft 47, and each cam 76, 77, 78 is formed to rotate in conjunction with the swinging of the chain guide 43. The aforementioned reverse operation and reverse limit switch 65
And the sliding body 79... is attached to the movable contacts 74... of 68, 70...
The forward rotation operation and forward rotation limit switches 64, 67, 69's movable contacts 74... are fixed in the middle of the prismatic sliding shafts 80..., and the first to third cams 76, 77 are brought into contact with each other. , 78 are attached to the tips of the sliding bodies 79 and the sliding shafts 80,
Stoppers 57, 58 at the ends of the load chain 16
comes into contact with the guide cylinders 53 and 54 and the chain guide 4
3 swings, the rotation of the sensing shaft 47 turns off the forward rotation or reverse rotation operation limit switch 64 or 65 via the first cam 76, and the chain guide 43 swings, causing the sensing shaft 47 to turn off. When rotates, the second
and the forward rotation limit switch 67, 69 or the reverse rotation limit switch 6 via the third cam 77, 78.
8, 70 are turned off, and at the forward/reverse operation limit of the reversible motor 17 of the chain block 14, the forward/reverse operation limit switches 64, 65 are delayed after being turned off, and the forward/reverse limit switches 67, 69, 68,
70 is configured to be turned off. Furthermore, the movable contact 74 of the normal rotation limit switch 67, 69
Lock levers 82 and 83 are provided to keep the lock levers 82 and 83 non-conductive by keeping them apart from the fixed contact 73, and the sliding shaft 80 is inserted into the through hole 84 of the lock lever 82 and 83, and the notch of the shaft 80 is inserted. A tongue piece 86 to be engaged with the notch 85 is formed at the mouth edge of the through hole 84 of the lock lever 82, 83, and a spring 87 which engages and holds the tongue piece 86 in the notch 85 is applied to the lock lever 82, 83. Projections 89 are provided in the guide grooves 88 for urging the lock levers 82 and 83 and for guiding and regulating the sliding movement of the lock levers 82 and 83.
... is fitted, and as the sliding shaft 80 retreats, the tongue piece 86 engages with the notch 85 and supports the movable contacts 74 of the normal rotation limit switches 67, 68 away from the fixed contacts 73... to form.

As shown in FIG. 11, the chain block 14
The reversible motor 17 is rotated forward and the load chain 16 is
and a reversing relay 91 for reversing the reversible motor 17 and lowering the load chain 16. The forward/reverse relay 9 via 65
This operation power source 94 is connected to the forward/reverse rotation relay coils 92, 93 of 0, 91, and the forward/reverse rotation limit switches 67, 69 and 68, 70 are connected.
Further, the drive power source RST is connected to the reversible motor 17 via the forward/reverse switches 95, 96 of the forward/reverse relays 90, 91, and an OFF self-holding normal rotation limit switch 67 is provided with the lock levers 82, 83. With the forward rotation switch 95 kept non-conductive by turning off the switch 69, the reversible motor 17 can be arbitrarily driven reversely in one direction only through the reverse rotation switch 96. When the limit switches 67 and 69 are operated, the motor 17 is
is reversed, and the load chain 16 is lowered to lower the load, while the reverse limit switch 6
Normal rotation limit switch 67, 6 via 8, 70
9 is connected to the drive power source ST, and when the forward rotation limit switches 67 and 69 are activated, the forward rotation switch 9 is connected to the drive power source ST.
5 only, and reverse limit switch 68,70
The forward rotation and reverse rotation switches 95 and 96 are respectively maintained in a non-conductive state during operation.

The present invention is constructed as described above, and the forward/reverse manual operation switch 2 of the operation switch box 20 is configured as described above.
3, 24, 25, and 26 to move the saddle 5 and trolley 8 back and forth and left and right, position the chain block 14 at an arbitrary position, and set the load chain 1.
When the forward rotation manual operation switch 21 of the switch box 20 is pressed, the forward rotation switch 95 is turned on by excitation of the relay coil 92 of the forward rotation relay 90. , the reversible motor 17 is rotated in the normal direction to wind up the load chain 16, and the load suspended from the hook 15 is raised to a desired height. At this time, when the stopper 57 at the base end of the hook 15 contacts the guide tube 53 via the buffer spring 59 at the upper limit of hoisting the load chain 16, the sliding shaft 80 of the normal rotation operation limit switch 64 is rotated by the rotation of the sensing shaft 47.
is displaced by the first cam 76, and the switch 64 is turned off to stop the reversible motor 17. If the forward rotation switch 95 is burnt out and welded, the motor will be turned off when the forward rotation operation limit switch 64 is turned off. 17 further winds up the load chain 16 without stopping, but the load chain 16
The rotation of the sensing shaft 47 accompanying the winding of the forward rotation limit switches 67, 69 causes the sliding shafts 80, 80 of the forward rotation limit switches 67, 69 to move into the second and third cams 77, 78.
The lock levers 82 and 83 engage the shafts 80 and 80, and the switch 6
7 and 69 are kept off to stop the reversible motor 17. When the forward rotation limit switches 67 and 69 are kept off by the lock levers 82 and 83 as described above, and the forward rotation switch 95 is brought into a non-conductive state,
Press reverse manual operation switch 22 to turn reverse relay 9 on.
The reversing relay coil 93 of No. 1 is energized, the reversing switch 96 is turned on, the reversible motor 17 is reversed, the load chain 16 is lowered, and the hook No. 1 is lowered.
5, the welded normal rotation relay 90 was repaired, and the lock levers 82, 83 were removed.
is pressed to release the engagement of the notches 85 and the tongues 86, and the forward rotation limit switches 67 and 69 are turned back on to enable the forward rotation manual operation switch 21 to drive the reversible motor 17 in the forward rotation. As mentioned above, the forward rotation switch 95 is welded to the normal rotation switch 95.
When the forward rotation limit switches 67, 69 are turned off due to welding, the forward rotation limit switches 67, 69 are not automatically turned back on due to the reverse operation of the reversible motor 17 by the reverse relay 91, and the welded forward rotation switches 67, 69 are turned off. This prevents a short-circuit accident of the drive power source RST due to 95, and allows only the reverse rotation of the reversible motor 17 to be driven arbitrarily.

Further, when the reverse manual operation switch 22 of the switch box 20 is pressed, the reverse switch 96 is turned on by the excitation of the relay coil 93 of the reverse relay 91, and the reversible motor 17 is reversed to unwind the load chain 16. , the load suspended from the hook 15 is lowered. At this time, when the stopper 58 at the end of the chain 16 contacts the guide cylinder 54 via the buffer spring 60 at the lower limit of the lowering of the load chain 16,
The rotation of the sensing shaft 47 causes the sliding body 79 of the reverse operation limit switch 65 to be moved to the first cam 76.
If the reverse switch 96 is burnt out and welded, the motor 17 will not stop when the reverse operation limit switch 65 is turned off. The load chain 16 is further lowered, but due to the rotation of the sensing shaft 47 accompanying the lowering of the load chain 16, the sliding bodies 79, 79 of the reverse limit switches 68, 70 are moved by the second and third cams 77, 78. The motor 17 is displaced and the hook 15 is lowered to the lower limit.
to stop. When the reverse operation limit switches 68 and 70 are turned off as described above, the reverse switch 96 is held non-conductive and the switch 6 is turned off.
Forward rotation operation limit switch 67, 69 at 8, 70
The forward rotation switch 95, which is connected through This is to prevent forward and reverse rotation and repair the welded reverse rotation relay 91.

In addition, in the above embodiment, the chain block 14
However, when the saddle 5 moves to the front and rear ends of the traveling rail 3, the forward/reverse operation and the forward/reverse limit switches 64, 65, 67, 68,
By incorporating the motors 69 and 70 so that they operate with multiple stages of delay in the same way as in the above embodiment, the reversible motor 7 of the saddle 5 can also be controlled in the same manner as the chain block 14. When the trolley 8 moves, each of the limit switches 6
By assembling motors 4, 65, 67, 68, 69, and 70 so as to operate in the same manner, the reversible motor 10 of the trolley 8 can also be easily controlled in the same manner as in the above embodiment.

As is clear from the above embodiments, the present invention provides a forward rotation switch 95 of the reversible motor 17 and a drive power source RST.
Forward rotation limit switches 67, 69 installed between
is connected to the drive power source RST via the reverse rotation limit switches 68, 70, and when the forward rotation limit switches 67, 69 are activated, only the forward rotation switch 95 is activated, and when the reverse rotation limit switches 68, 70 are activated, the forward rotation and reverse rotation switches 95, 96 are activated. The reversing switch 96 is welded while the reversible motors 7, 10, 17 such as the electric chain block 14, the electric trolley 8, and the electric saddle 5 are being driven, so that they are kept in a non-conductive state at all times. By maintaining the chain block 14, the reverse limit switches 68, 70 are activated with the load hanging hook 15 side of the load chain 16 in the maximum extended state, and the trolley 8 and saddle 5 are moved to the storage standby position. The off-operation allows the reversible motors 7 and 10 to be stopped and held, and the chain block 14, trolley 8 and saddle 5 to be stopped in the posture position that is easiest to repair, and for installation at relatively high places such as the ceiling of a factory. It is possible to safely carry out repair work on the chain block 14, trolley 8, saddle 5, etc. that is installed at a certain location, and it also eliminates the inconvenience of lifting a load on the chain block 14 when the reversing switch 96 for lowering the load is welded. This has remarkable effects such as being able to prevent movement, making it safe and easy to handle.

[Brief explanation of drawings]

Fig. 1 is an overall front view showing one embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a side view of the same, and Fig. 4 is a front view of the entire embodiment.
The figure is a sectional view of the chain block, Fig. 5 is an exploded explanatory view of the chain block, Fig. 6 is a partially enlarged plan view, Fig. 7 is an explanatory diagram of operation, Fig. 8 is a partially enlarged exploded view, and Fig. 9 is an exploded explanatory view of the chain block. Operation explanatory diagram, Fig. 10 is a partially enlarged sectional view, Fig. 11
The figure is an electrical circuit diagram. 17... Reversible motor, 67, 69... Forward rotation limit switch, 68, 70... Reverse rotation limit switch,
95...Forward rotation switch, 96...Reverse rotation switch, RS
T...Drive power supply.

Claims (1)

[Claims] 1. A forward rotation switch 95 and a reverse rotation switch 96 are provided between the reversible motor 17 and this drive power source RST,
Reverse rotation limit switches 68, 70 are provided between the drive power source ST and the reverse rotation switch 96, forward rotation limit switches 67, 69 are provided for connecting the reverse rotation switches 68, 70 to the forward rotation switch 95, and a reverse rotation limit switch is provided in the drive power source ST. 68,7
The forward rotation switch 95 is connected in series through the zero and forward rotation limit switches 67, 69, and when the forward rotation limit switches 67, 69 are activated, only the forward rotation switch 95 is activated, and the reverse rotation limit switches 68, 7 are activated.
1. A drive device for a cargo handling machine, characterized in that the forward rotation and reverse rotation switches 95 and 96 are held in a non-conductive state during zero operation.