JP3338401B2 - Air-driven elevator brake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for an air-driven lift which raises and lowers a conveyed object by an air-driven cylinder device.

[0002]

2. Description of the Related Art In general, a small number of components are required to transport small and light objects, and the like.
An elevator using an air-driven cylinder device has been adopted because it is advantageous in price and maintenance. However, in an elevator using an air-driven cylinder device, if the load factor exceeds 50% of the thrust of the air cylinder, the acceleration of gravitational acceleration affects the speed control during descent, and the stopping accuracy and safety There are problems such as difficulty in securing security.

Therefore, today's air-driven elevators include:
Some include a differential pressure control circuit, and perform speed control by switching the solenoid valve of the air line by sequence control.

[0004] However, in such an elevator, pressure adjustment is necessary, and there is a problem that a control circuit thereof is complicated. In addition, when a long cylinder stroke is operated at a high speed, it is difficult to perform braking near ideal. In addition, there is a problem that a shock unevenness or a speed unevenness when starting deceleration may occur due to a short adjustment length of the shock absorber.

In view of the above, the present invention can reliably decelerate and stop the operation of a long-stroke, long-stroke air-driven cylinder device that descends at a high speed even when the suspension load is large. It is an object of the present invention to provide a braking device which does not generate impact or speed unevenness at the time and does not require special devices and parts for braking, and is easy to maintain.

[0006]

The invention according to claim 1 is
In a braking device for an air-driven elevator driven up and down by an air-driven cylinder device, the cylinder device is provided with a deceleration start position detection sensor for detecting a deceleration start position in the middle of the descending stroke, and when the cylinder device is lowered. A switching control valve that is activated by the detection signal of the detection sensor and switches the exhaust of the cylinder device from a normal exhaust line to a high-pressure relief line having a high-pressure relief valve.

According to a second aspect of the present invention, in the first aspect of the present invention, the high-pressure relief line is connected to a preload line that constantly applies a preload to the high-pressure relief line.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the switching control valve is an electromagnetically driven three-way valve, and the first port of the electromagnetically driven three-way valve is a lowering of the cylinder device. The second port is connected to an exhaust line, and the third port is connected to a high-pressure relief line having a high-pressure relief valve.

According to a fourth aspect of the present invention, in the third aspect, the electromagnetically driven three-way valve is provided with a counter pressure chamber for applying a counter pressure to both ends of the spool valve.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a plurality of air-driven cylinder devices are connected in series, and the switching control valve is connected to each cylinder device. It is characterized by.

Further, the invention according to claim 6 is the invention according to claim 1.
The invention set forth in any one of the first to fifth aspects, characterized in that the set pressure of the high-pressure relief valve and the deceleration start point are adjusted so as to sufficiently reduce the speed at the stroke end of the cylinder device.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, a transferred object handling jig is mounted at a lower end of the cylinder device.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a system diagram showing an embodiment of a control device for an air-driven elevator according to the present invention. A rod lock mechanism 2 is provided at a lower portion of an air-driven cylinder device 1. An air-driven cylinder device 1 is mounted on a traveling platform 3 via a lock mechanism 2. The traveling platform 3 can travel along a traveling rail 4 extending in a direction perpendicular to the plane of FIG. The piston rod 5 of the air-driven cylinder device 1 extends downward through the traveling base 3 and is movable in the vertical direction. A jig 6 for handling a transferred object is attached to a lower end of the piston rod 5.

An upper air supply / exhaust port 7 and a lower air supply / exhaust port 8 are provided at the upper end and the lower end of the cylinder of the air-driven cylinder device 1, respectively.
A supply / exhaust conduit for supplying / discharging the driving air is connected to the lower supply / exhaust port 8. That is, reference numeral 10 denotes a high-pressure air supply source such as a compressor. The high-pressure air supply source 10 is connected to three pressure adjusting valves 11a, 11b, and 11c connected in parallel to each other. The first and second electromagnetic switching valves 12, 13 connected in parallel to each other are connected to 11a.

The first electromagnetic switching valve 12 has a first
Outlet port 12a is provided with the check valve 14 and the discharge flow control valve 1
5 is connected to a first port 16a of the three-way switching control valve 16 via a supply / exhaust line having a parallel circuit, and the second port 16b of the three-way switching control valve 16 is connected to the lower supply / exhaust port 8 of the air cylinder device 1. It is connected.

The second outlet port 12b of the first electromagnetic switching valve 12 is connected to a parallel circuit of a discharge flow control valve 18 having a check valve 17 and an inflow pressure control valve 20 having a check valve 19. It is connected to the upper air supply / exhaust port 7 of the air drive cylinder device 1 via an air supply.

The third port 1 of the three-way switching control valve 16
6c is connected to a high-pressure relief line 22 having a high-pressure relief valve 21.
, The high pressure relief line 22 has a constant pressure regulating valve 1
A preload line 23 for applying a predetermined preload via 1b is connected via a check valve 24.

On the other hand, the first and second outlet ports 13a and 13b of the second electromagnetic switching valve 13 are connected to the rod lock mechanism 2, and the pressure regulating valve 11c controls the three-way switching control via the counter pressure line 25. The valve 16 is connected to a counter pressure chamber described later.

When the first electromagnetic switching valve 12 is in the state shown in the figure, high-pressure air adjusted to a predetermined pressure by the pressure adjusting valve 11a is supplied to the check valve 14 and the three-way switching control valve 1.
6, the lower supply / exhaust port 8 of the air-driven cylinder device 1
From above, the piston rod 5 is moved upward, and the transferred object handling jig 6 is raised. At this time, the air discharged from the upper supply / exhaust port 7 is discharged to the outside via the first electromagnetic switching valve 12 while being adjusted by the discharge flow control valve 18.

On the other hand, when the first electromagnetic switching valve 12 is switched and the inlet port 12d is connected to the second outlet port 12b, high-pressure air is supplied to the inflow pressure adjusting valve 20 and the check valve 1
9, the upper air supply / exhaust port 7 of the air drive cylinder device 1
, The piston rod 5 is lowered, and the transferred object handling jig 6 is lowered. At this time, the air discharged from the lower supply / exhaust port 8 is discharged to the outside via the first electromagnetic switching valve 12 while being adjusted by the discharge flow rate adjusting valve 15.

The operation of the second electromagnetic switching valve 13 supplies / discharges high-pressure air to / from the rod lock mechanism 2 to lock or release the piston rod 5.

The air cylinder device 1 has a piston rising end position detecting sensor 2 on one side of the cylinder.
6 and a lower end position detection sensor 27 are provided.
A deceleration start position detection sensor 28 is provided between the rising end position detection sensor 26 and the falling end position detection sensor 27. Thus, when the position is detected by the deceleration start position detection sensor 28 during the lowering of the piston, the three-way switching control valve 16 is switch-controlled, and the second port 16b is communicated with the third port 16c. Air discharged from the lower supply / exhaust port 8 of the air drive cylinder device 1 flows to the high pressure relief valve 21 side, and the high pressure relief valve 21 restricts the amount of exhaust. Therefore, the lowering speed of the piston of the air drive cylinder device 1 is reduced. in this case,
The set discharge pressure of the high-pressure relief valve 21 is set slightly lower than the pressure that normally balances with the suspension load. That is, for example, in the case of a cylinder having a diameter of 4 cm, the pressure is set to about 4 kg / cm ² to balance with the suspension load.

The set position of the deceleration start position detecting sensor 28 is set so as to be at the lower end when the piston is sufficiently decelerated. A point that matches the air supply amount (pressure / flow rate), the set pressure of the high-pressure relief valve 21 and the pipe resistance is searched, and the piston is stopped in a short time, and is selected so as to be in a position where no impact occurs.

In this way, the piston reaches the lower end without generating an impact, which is detected by the lower end detecting sensor 27.
Is detected by the three-way switching control valve 16 again in FIG.
And the lower supply / exhaust port 8 is opened to the atmosphere as in the case of a normal air cylinder.

Therefore, the piston descending at a high speed is decelerated halfway and stopped quietly.

Further, as described above, a preload having the same pressure as the set discharge pressure of the high pressure relief valve 21 is applied to the high pressure relief line 22 by the preload line 23 as described above. Therefore, it is possible to reliably prevent a sudden acceleration from acting on the piston rod 5 instantaneously due to the differential pressure at the start of deceleration and applying an impact.

FIG. 2 is an external perspective view of the air-driven cylinder device according to the present invention. The lower supply / exhaust port 8 serving as a discharge port at the time of lowering has a three-way switching control valve 16, a high-pressure relief valve 21, and a discharge flow rate adjustment. The valve 15 and the non-return valves 14 and 24 are integrated and miniaturized directly. Also,
An inflow pressure adjusting valve 20 and a check valve 19 are connected to an upper air supply / exhaust port 7 serving as a discharge port at the time of ascending.
7 are connected in parallel and integrally formed, and the miniaturized one is directly attached.

With this configuration, each device around the air drive cylinder can be arranged neatly in a relatively small space, and the brake capacity of the brake device can be set close to the setting without the air volume remaining in the pipe. be able to.

FIG. 3 shows a three-way switching control valve 1 according to the present invention.
6 is a sectional view of FIG. 6, in which the electromagnetic solenoid 30 controls the movement of the spool valve 31 in the axial direction, and the second port 16b is connected to the first port 16a or the third port 16c.
Is communicated to.

The counter pressure line 25 is connected to a connection port 32 of the three-way switching control valve 16. Further, an annular chamber 33 communicating with the connection port 32 is formed in the valve body. The annular chamber 33 is formed at one end of the spool valve 31 through a communication passage 34.
Is connected to the counter pressure chamber 35. Also,
The annular chamber 33 communicates with a second counter pressure chamber 37 formed at the other end of the spool valve 31 via a communication passage 36.

Accordingly, the first and second counter pressure chambers 35 and 37 have the counter pressure line 25 therein.
, High-pressure air is supplied thereto, and a counter pressure is applied to both ends of the spool valve 31. Therefore, the occurrence of excessive stress on the valve seal body 38 due to the fluctuating pressure in the valve that occurs at the start of deceleration and the occurrence of settling on the valve seal body 38 are reduced by the counter pressure, and the deceleration start timing varies. Is prevented.

FIG. 4 shows another embodiment of the present invention, in which two air-driven cylinder devices 1a and 1b are connected in series. That is, the piston rod 40 of the other air-driven cylinder device 1b is connected to the piston rod 5 of the air-driven cylinder device 1a, and the cylinder 41 is configured to move up and down relatively to the piston rod 40. A transferred object handling jig 6 is attached to the lower end of 4.

The same control circuit as the control circuit shown in FIG. 1 is connected to the air driven cylinder devices 1a and 1b, respectively. High-pressure air is supplied to and exhausted from the port 7 and the lower supply / exhaust port 8, and is controlled in the same manner as that shown in FIG. On the other hand, the air drive cylinder device 1
The upper supply / exhaust port 7 and the lower supply / exhaust port 8 of FIG.
Is controlled in the same manner as the air-driven cylinder device 1 shown in FIG.

Thus, for example, two air driven cylinder devices 1a, 1
With the piston rods 5 and 40 of b being retracted, the piston rod of one cylinder is locked,
It is run along. When the piston rods 5 and 40 of the two air driven cylinder devices 1a and 1b are both advanced, that is, the piston rod 5 of the air driven cylinder device 1a is lowered to the lowermost position, and the cylinder 41 of the air driven cylinder device 1b is moved. Is moved to the lowermost position, the transferred object handling jig 6 is at the lowest position, and reaches the lowest stage of the payout storage shelf. Further, by moving only one of the piston rods of the two air-driven cylinder devices 1a and 1b forward, it is possible to pay out and take in the conveyed object at the middle stage of the payout storage shelf. Further, when the two air-driven cylinder devices 1a and 1b are configured so that their strokes are different from each other, the piston rod of the cylinder with the longer stroke is advanced or the piston rod of the cylinder with the shorter stroke is advanced. It is possible to carry out and take out the conveyed objects to the two types of intermediate shelves depending on whether the operation is performed.

[0036]

As described above, according to the present invention, the switching control valve is actuated by the detection signal of the deceleration start position detecting sensor provided in the air driven cylinder device, and the exhaust gas when the cylinder device is lowered is reduced to a normal value. Since the exhaust line is switched to the high-pressure relief line, even when the suspension load is large, the long-stroke, long-stroke, long-stroke air-driven cylinder device can be reliably decelerated and stopped from a predetermined position on the way. In addition, by applying a preload to the high-pressure relief line, the movement at the start of deceleration and at the time of stop can be made smooth.

Further, when a counter pressure is applied to both ends of the spool valve of the electromagnetically driven three-way valve constituting the switching control valve, excessive stress is applied to the valve seal body due to the fluctuating pressure in the valve generated at the start of deceleration. In addition, sagging of the valve seal body can be reduced. In addition, by connecting a plurality of air-driven cylinder devices in series, it is possible to set the lowering position of the transferred object handling jig to a plurality of positions, and to discharge and transfer the transferred object to a plurality of types of intermediate shelves. Can be.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a braking device for an air-driven elevator according to the present invention.

FIG. 2 is an external perspective view of an air drive cylinder device according to the present invention.

FIG. 3 is a sectional view of a three-way switching control valve according to the present invention.

FIG. 4 is a system diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air drive cylinder device 6 Jig for handling transferred objects 7 Upper supply / exhaust port 8 Lower supply / exhaust port 10 High-pressure air supply source 11a, 11b, 11c Pressure regulating valve 12 First electromagnetic switching valve 13 Second electromagnetic switching valve 16 Three-way switching control valve 18 Discharge flow regulating valve 21 High pressure relief valve 22 High pressure relief line 23 Preload line 25 Counter pressure line 26 Rising end position detection sensor 27 Descending end position detection sensor 28 Deceleration start position detection sensor 31 Spool valve 35 First counter Pressure chamber 37 Second counter pressure chamber 38 Valve seal 42 Third electromagnetic switching valve

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-56-161299 (JP, A) JP-A-8-210304 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B66F 1/00-19/02

Claims (5)

(57) [Claims] 1. A brake device for an air-driven elevator driven up and down by an air-driven cylinder device, wherein said cylinder device is provided with a deceleration start position detecting sensor for detecting a deceleration start position in the middle of a descending process. A switching control valve is provided in the exhaust line when the cylinder device descends, which is operated by the detection signal of the detection sensor and switches the exhaust of the cylinder device from a normal exhaust line to a high-pressure relief line having a high-pressure relief valve.
The leaf line is always preloaded on its high pressure relief line
A braking device for an air-driven elevator , wherein a preload line for providing a pressure is connected . The switching control valve is an electromagnetically driven three-way valve, and the electromagnetically driven three-way valve has a counter pressure at both ends of a spool valve.
A counter pressure chamber for applying force is provided.
A first port of the magnetically driven three-way valve is connected to an intake / exhaust line, a second port is connected to a descending exhaust port of the cylinder device, and a third port is connected to a high pressure relief line having a high pressure relief valve. Claims
1 Symbol mounting the braking system of the air-driven elevators. 3. A plurality of air drive cylinder device is connected in series, wherein the switching control valve is connected to each cylinder device, the braking of claim 1 or 2 air-driven lift according apparatus. 4. As is well decelerated at stroke end of the cylinder device, characterized in that the set pressure and the deceleration starting point of the high-pressure relief valve is adjusted, according to any one of claims 1 to 3 Air-driven elevator braking device. Characterized in that wherein the conveyed object handling jig at the lower end of the cylinder device is mounted, brake air driven lift machine according to any of claims 1 to 4.