JPH042895Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for conveying a cart on a conveyor, and particularly includes a fork that is driven up and down to engage and disengage from the cart.

(Prior Art) Conventionally, in conveyor devices for conveying carts, devices have been known in which the cart is arbitrarily stopped on a conveying unit such as a conveyor belt or chain (for example, in Japanese Patent Application Laid-Open No. 1983-1999). (Refer to Publication No. 77009). However, the device shown in the above publication is designed to stop the cart without stopping the conveyor belt, and when the cart is stopped,
Continuous slipping occurs between the conveyor belt and the friction plate,
Therefore, there is a lot of friction and loss of driving force.

Therefore, in order to stop the cart arbitrarily without causing such problems, it is known that the transport unit is provided with a fork that is driven up and down, and the fork engages and disengages from the cart ( For example, see Utility Model Application Publication No. 56-72818). by the way,
In this type of conveyor cart drive device, when the cart and the fork engage and disengage, the two may interfere due to a slight shift in their positions.
When such an unusual situation occurs, the apparatus stops, the transportation of the trolley is interrupted, and the transportation efficiency is reduced.

(Purpose of the invention) The present invention solves the above problems, and when interference occurs when the cart and fork engage and disengage,
To provide a conveyor truck drive device that can immediately avoid this problem and prevent any trouble in transporting the truck.

(Structure of the Invention) The present invention provides a conveyor cart drive device comprising a conveyor cart and a carrier unit disposed below the conveyor cart for transporting and driving the conveyor cart. On the other hand, an engaging means consisting of a fork that engages with this neck portion is provided, and the neck portion or fork provided on the carrier unit is held so as to be able to be raised and lowered, and the engagement and disengagement of the neck portion and the fork are performed by this raising and lowering. and is configured such that the conveyor truck is conveyed by the carrier unit in the engaged state, and is provided with a detection means for detecting interference during the engagement operation between the neck portion and the forks,
The output transmission mechanism of the motor for driving the carrier unit is provided with a brake, and is equipped with a control device that releases the operation of the brake when interference between the fork and the neck portion is detected during the lifting/lowering operation of the fork. It is.

With this configuration, when interference between the truck and fork is about to occur, the entire carrier unit becomes in a free floating state, making it possible to prevent interference between the two.

(Example) An example of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 schematically shows the overall configuration. A plurality of carts 2 transported on a cart rail 1 are provided with a cart neck portion 3, and are engaged and disengaged by being driven up and down by the cart neck portion 3. A fork 4 is provided on a carrier unit 5 that is driven to be conveyed.

This carrier unit 5 is composed of a tension unit 7 made of a chain guided by a rail 6, and this tension unit 7 has a wire 9 stretched between chain connecting fittings 8, 8, and a wire 9 that is A plurality of sprockets 10, 1
1, 12, 13, and a shaft 14 of a sprocket 10 to which the output shaft of a driving motor 15 is connected. In this embodiment, when the fork 4 is raised and engaged with the truck neck portion 3, the motor 15
The carrier unit 5 is conveyed via the output transmission mechanism by the forward rotation of the fork 4, and after the carriage 2 is sent one pitch in the direction of the arrow to the next station, the fork 4 is lowered and engaged with the carriage neck 3. leave,
The carrier unit 5 is rotated by the reverse drive of the motor 15.
is transported backwards, and Fork 4 returns to its original station. Note that a cylinder 16 as a drive source for driving the fork 4 up and down is provided at each station. This fork 4
Detailed configurations for the lifting and lowering drive and movement of conveyance and reverse conveyance will be described later.

In addition, for example, the shaft 14 in the output transmission mechanism,
An electromagnetic brake 17 is provided to stop the conveyance, and in the present invention, as will be described later, the operation of the neck portion of the truck is carried out with the electromagnetic brake 17 activated.
The fork 4 is equipped with a control device 18 that detects interference between the fork 4 and the fork 4 and temporarily releases the operation of the electromagnetic brake 17 when the two interfere with each other.

FIGS. 2 to 4 show configurations for driving the carrier unit 5 and fork 4.
A shaft portion 41 is supported by the tension unit 7 so as to be able to rise and fall freely, and a roller 42 is provided at the lower end of the fork 4, and this roller 42 is fitted into a guide rail 20 provided at each station. This guide rail 20 is supported by a base 21 and the guide rod 2
2, the cylinder 16 moves up and down in the direction of arrow A (FIG. 4). In addition, when the guide rail 20 is in a lowered state, that is, in a state shown by a two-dot chain line 20' in FIG.
A fixed side guide rail 23 is provided at the same horizontal position as the guide rail 20. That is, in the above state, the movable guide rail 20 and the fixed guide rail 23 form a linearly continuous rail.

Then, at each station, the rollers 42 of the fork 4 fit into the guide rail 20, and the guide rail 20 is raised by the cylinder 16, so that the fork 4 engages with the truck neck portion 3. In this state (upper limit), the carrier unit 5 is driven (forward) to transport the truck 2. At this time, the roller 42 of the fork 4 moves on the upper surface of the fixed side guide rail 23 as shown by arrow B in FIG. When the fork 4 is transported to the next station, the roller 42 of the fork 4 again fits into the guide rail 20 of that station.
Subsequently, the guide rail 20 is lowered by the cylinder 16, whereby the engagement between the fork 4 and the truck neck portion 3 is disengaged (lower limit). At this time, the guide rail 20 is at the position shown by the two-dot chain line 20' in FIG. 4, and then the carrier unit 5 is reversely transported (backward), so that the fork 4 is returned to its original station. At this time, the rollers 42 of the fork 4 are returned within the stationary guide rail 23 as shown by arrow C in FIG. Enter the rail 20. By repeating such operations, the carrier unit 5 moves back and forth, and the carriage 2 is intermittently conveyed one pitch at a time.

In addition, in order to detect whether or not the guide rail 20 has been properly raised and lowered, an operating piece 24 is attached to the lower end of one of the guide rods 22 of the guide rail 20.
, and limit switches 25 and 26 for detecting upper and lower limits, which are turned on and off by the operating piece 24, are provided. Based on the detection signals from the limit switches 25 and 26, the control device 18 controls the engagement between the fork 4 and the truck neck portion 3;
It is now possible to detect that interference has occurred when leaving the vehicle.

FIG. 5 shows an example of a circuit of the control device 18. In the figure, in order to simplify the explanation, a case is shown in which there are two stations, that is, forks F1 and F2. LS1 and LS2 are limit switches that detect the upper limits of forks F1 and F2, and correspond to limit switch 25 in FIG. 4. LS11, LS12 are Fork F1, F
This is a limit switch that detects the lower limit of 2 and corresponds to the limit switch 26 in FIG.
CR1, CR2, CR3, CR11, CR12, CR1
3 is the relay coil and its contacts, CR _A is the backward limit of the carrier unit 5, CR _B is the fork upward command, CR _C is the forward limit of the carrier unit 5, CR _D is the fork downward command, M _S A is the forward direction of the motor 15. drive, MSB is the contact of each switch for the backward drive of the motor 15, TR1 is a timer relay coil and contact that is used to monitor fork ascent, that is, operates when a failure in fork ascent is detected, and TR2 is a timer that is used to monitor fork ascent, that is, that operates when detecting descent. The relay coil and contact MS are actuators for temporarily releasing the electromagnetic brake 17 when the motor 15 is not being driven and a defect in raising or lowering the fork is detected.

To explain the general operation of this circuit configuration, when the motor stops driving forward and backward, the carrier unit 5 is at the backward limit, and the fork raise command is output, contacts M _S A, M _S B, and Both CR _A and CR _B become "closed", and due to the interlock configuration, the fork will not operate unless the relay coil CR3 of the fork upper limit is energized (turned on) and its contact CR3 becomes "open" within a certain period of time. The timer relay TR1 for monitoring the rise is activated, and the actuator MS for releasing the brake is activated. On the other hand, when both forks F1 and F2 reach their upper limits normally, limit switches LS1 and LS2 are closed, relay coils CR1 and CR2 are turned on, and their contacts CR1 and CR2 are turned on.
becomes "closed" and relay coil CR3 turns on. The same applies when the fork is commanded to descend at the forward limit.

As a result of the above-mentioned operation, as shown in FIG.
7 is released, the entire carrier unit 5 assumes a floating structure, and the fork 4 moves in the direction of the dashed arrow, allowing it to rise to its upper limit as shown in FIG. The illustration shows a case where there is interference on the left side of the fork 4, but when there is interference on the right side of the fork 4, the fork 4 moves to the right.
Furthermore, the same operation occurs when descending. In this way, interruptions in the transport of the conveyor truck can be prevented.

The forward limit and backward limit stop positions may be detected by the traveling length of the carrier unit 5, a micro switch disposed at a predetermined position, or the like.

As in the above embodiment, the entire carrier unit 5 can have a floating structure when the transport is stopped, and the fork 4 is rigidly held against the carrier unit 5 during transport.
In contrast to the floating structure that elastically holds the fork 4 against the carrier unit 5,
It also has the advantage of eliminating looseness during transportation and deterioration of positioning accuracy.

In addition, the carrier unit 5 as a conveyor
The present invention is not limited to a reciprocating conveyor as in the above-mentioned embodiment, but can be similarly applied to an endless conveyor that is conveyed intermittently. Further, the relationship between the fork 4 and the neck portion 3 may be reversed. That is, the fork 4 may be provided on the lower side of the truck 2, and the neck portion 3 may be provided on the carrier unit 5 so as to be movable up and down.

(Effects of the invention) As described above, according to the invention, if interference occurs between the two during the lifting and lowering operation of the fork that is driven up and down and engages and disengages from the neck of the truck, the brake of the drive motor of the carrier unit is released. (Open), when interference occurs, the carrier unit immediately becomes free, that is, has a floating structure, without interfering with the conveyance of the trolley, and the interference between the two is eliminated and engagement and disengagement are performed without resistance.
The conveyance efficiency of the conveyor truck can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an embodiment of the device of the present invention, Fig. 2 is a side sectional view of the main part of the device, Fig. 3 is a partially cutaway front view of the same device, and Fig. 4 is the main part of the device. 5 is a front sectional view of the control device, and FIG. 6 is a circuit diagram of the control device.
7 are explanatory diagrams of the operation of the device. 2... Bogie, 3... Bogie neck, 4... Fork, 5... Carrier unit, 15... Motor, 17... Electromagnetic brake, 18... Control device,
25, 26...Limit switch.

Claims (1)

[Scope of utility model registration request] In a conveyor truck drive device comprising a conveyor truck and a carrier unit disposed below the conveyor truck for transporting and driving the conveyor truck, the conveyor truck and the carrier unit have a neck portion on one side and a neck portion on the other side that engages with the neck portion. An engaging means consisting of a fork is provided, and the neck part or fork provided on the carrier unit is held so as to be able to rise and fall, and by this raising and lowering, the neck part and the fork are engaged and disengaged, and the carrier unit is moved in the engaged state. The conveyor truck is conveyed by a conveyor truck, a detection means is provided for detecting interference when the neck portion and the fork engage with each other, and a brake is provided for the output transmission mechanism of the motor for driving the carrier unit. and a control device for releasing the operation of the brake when interference between the fork and the neck portion is detected during the raising and lowering operation of the fork.