JPS6140329Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the safety device for the door of a large dust collector, which prevents the drive circuit of a blower, etc., from operating unless all of the many doors of the large dust collector are closed.

Large dust collectors are provided with many doors for maintenance and inspection, and if the blower or other devices are operated with any of these doors open, there is a danger that the worker will be sucked inside the dust collector due to the negative pressure inside, or that the door will suddenly close and pinch the worker. For this reason, door safety devices are provided so that the drive circuits for the blowers and other devices will not operate unless all the doors are closed, but conventional door safety devices have limit switches attached to each door and their contacts are connected in series to the drive circuits for the blowers and other devices to prevent the blowers and other devices from operating when any door is open. Therefore, in large dust collectors where the number of doors exceeds several tens, it is necessary to install an extremely large number of limit switches, and the wiring work is not easy and maintenance is time-consuming, and there are problems such as the occurrence rate of accidents due to malfunction of the limit switches increasing in proportion to the number of doors.

The present invention was completed with the aim of providing a safety device for the door of a dust collector that does not have the above-mentioned problems, and the present invention will be described in detail below with reference to the illustrated embodiments.

Reference numeral 1 denotes a large dust collector main body in which a plurality of doors 2 are arranged in parallel, each of which has one side pivoted to the front wall of the dust collector main body 1 with a hinge 3, and the other side. A metal fitting 4 is provided protruding from the outer surface of each side part. Reference numeral 5 denotes a flexible connecting member such as a chain or wire whose one end is fixed to the wall surface on one side of the dust collector main body 1. After inserting the book, the set rod 7 attached to the other end is inserted into the set rod holder 8 provided on the other wall of the dust collector main body 1. The connecting members 5 have a length such that the door 2 cannot be opened when the setting rod 7 is inserted into the setting rod holder 8, so that the connecting members 5 are kept under tension. Further, as shown in FIG. 2, the set rod receiver 8 has a cylindrical portion 9 for receiving the set rod 7 and a lock 10 adjacent thereto. A claw 10' is inserted to normally lock the set rod 7 at the position shown in the figure.Furthermore, a slide body 12 is provided on the upper part of the set rod holder 8 and is movable up and down by a predetermined stroke. ', its lower end projects toward the setting rod 7 through the small hole 8'.
As shown in FIG. 3, this sliding body 1
A switch 14, such as a limit switch, is provided on the side of the slider 2 and is activated when the slider 12 is pushed up to the position shown in the figure by the set rod 7. In addition, for example, when the door 2 has the first to fourth stages, a total of four such set rod holders 8 will be installed, and a total of four switches will be installed as shown in Fig. 4. 14 is a drive circuit 15 for the blower 6, etc.
The blower 6 and the like will not operate even if the main switch 16 is turned on unless all the switches 14 are turned on. Note that the switch 14 is in the lock 1 position.
This is to prevent the drive circuit 15 from operating when 0 is off, and 17 is a key switch on the power distribution board, which turns off the drive circuit 15 when the key is removed.

With this structure, the set rods 7 are normally inserted into all the set rod holders 8 as shown in the figure, and the claws 1 of each lock 10 are inserted into the set rods 7.
0' fixes each set rod 7, each sliding body 12 is pushed up by the upper end surface of the set rod 7, and all switches 14 are in an on state. Therefore, when the key switch 17 is turned on and the main switch 16 is turned on, the drive circuit 15 is activated and the blower 6 etc. are started to collect dust. If it becomes necessary to open the door 2, use the metal fittings 4 of the door 2.
After removing the lock 10 of the set rod holder 8 holding the connecting member 5 penetrating through the set rod 7,
When the set rod 7 is pulled out from the set rod holder 8, the connecting member 5 is loosened, and the door 2 is opened. When the set rod 7 is pulled out, the sliding body 12 moves downward by the force of the spring 12', so that the limit switch, etc. The switch 14 is turned off, and when any switch is turned off, the drive circuit for the blower etc. becomes inoperable, and even if someone turns on the main switch 16 by mistake, there is no possibility that the blower 6 etc. will start. In addition, in the above embodiment, the connecting member 5
The switch is turned off when the set rod 7 attached to the other end is pulled out from the set rod holder 8. However, while the set rod 7 is slidably attached to the set rod holder 8, this set rod The other end of the connecting member 5 can be detachably connected to the connecting member 5.
When the set rod 7 is connected to the set rod 7 and a traction force is applied to the set rod 7 by its weight, the set rod 7 slides and operates the switch 14. In short, the set rod 7 is connected to the other end of the connecting member 5. A set rod holder 8 which can be detachably connected via a rod 7 is provided on the other side of the dust collector body 1, and the set rod holder 8 is opened and closed by the set rod 7 to control the operation of a drive circuit 15 such as a blower. A switch 14 may be provided. moreover,
The key switch 17 controls the operation of the pawl 10' of the lock 10.
Security is further improved by having the same key as the other key.

As is clear from the above description, in order to open the door, the connecting member must be loosened. The switch is activated by the movement of the switch, making it impossible to operate the drive circuit for the blower, etc. Also, each door must be closed in order for the switch to close by setting the set rod, so do not leave any door open. In this case, it is absolutely impossible to start the blower, etc., and various dangers that may occur when the door is operated with the door open can be completely prevented. Furthermore, the connecting member is tensioned in front of multiple doors, and the switch is turned on and off via a set rod, so for example, by passing one connecting member through 10 doors, 10 doors The open/closed state of the door can be detected with a single switch, and the number of switches is significantly reduced compared to the conventional method in which a limit switch is provided for each door to detect its open/closed state. This not only greatly reduces the amount of wiring work required, but also reduces the occurrence of limit switch malfunctions, greatly improving reliability as a safety device. It has great practical value as it solves the drawbacks of the door safety device.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front view showing an embodiment of the present invention, Figure 2 is a partially cutaway side view of the main part, and Figure 3 is a partially cutaway side view of the main part.
The figure is a partially cutaway rear view of the main part, and FIG. 4 is a circuit diagram. 1: Dust collector body, 2: Door, 5: Connecting member, 7:
Set rod, 8: Set rod receiver, 14: Switch,
15: Drive circuit.

Claims (1)

[Scope of utility model registration request] One end of a flexible connecting member 5 is connected to one side of a dust collector body 1 in which a plurality of doors 2 are arranged, and a set rod 7 is connected to the other end of the connecting member 5 on the other side of the dust collector body 1. A setting rod holder 8 that is detachably connected is provided, and the setting rod holder 8 is provided with a switch 14 that is opened and closed by the setting rod 7 to control the operation of a drive circuit 15 such as a blower. Safety device for dust collector door.