JPH0610041B2 - Roller conveyor power disconnecting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a roller conveyor for carrying loads, and an endless belt such as a drive endless belt or a chain is provided between a pair of left and right frames. A plurality of carrier rollers are arranged in parallel above the endless belt and arranged in parallel above the endless belt, and the plurality of carrier rollers are divided into a plurality of blocks along the direction in which the load is conveyed, and each block is divided into blocks. Is configured such that the endless belts are brought into contact with or separated from the lower surfaces of a plurality of carrier rollers, and the load placed on the carrier rollers and transported is transported and non-transported (transported) for each block. The present invention relates to the structure of a power disconnecting device that can be stopped).

[Conventional technology]

There are various power disconnecting devices for this type of roller conveyor,
As a method of using compressed air as a working medium, in Japanese Patent Publication No. 52-24755 of the prior art, a drive endless belt is arranged below a carrier roller, and the drive endless belt is used in a carrying direction of a load on the carrier roller. And the plurality of pressing rollers for each block supporting the driving endless belt at appropriate intervals in the longitudinal direction are lifted upward, whereby the upper surface of the driving endless belt is pressed against the lower surface of the carrier roller. The contact causes the carrier roller to rotate.

At this time, one end of each of the pressing rollers is supported rotatably up and down, while a supporting rail having an upwardly U-shaped cross section is provided below the other end of each of the pressing rollers, and is driven on the supporting rail. Expansion is achieved by supporting the other end of each pressing roller through an air tube of an appropriate length and a support plate on the upper surface of the endless belt, and injecting compressed air into each air tube. A configuration is disclosed in which the other end of the pressing roller is moved up and down for each block.

According to this configuration, the difference in the up / down dimension of the air tube due to the expansion / contraction of the elongated air tube becomes the vertical movement amount of the other end of the pressing roller as it is.

Moreover, since the pressing roller rotates up and down around one end thereof, and further, the wide endless belt is constantly advancing along the longitudinal direction on the upper surface of the pressing roller. If the amount of vertical movement of the other end of the roller is too small, the upper surface of the endless belt near the one end of the pressing roller will always be in contact with the lower surface of the carrier roller, and the driving of the carrier roller for each block must be stopped. I can't.

Therefore, in order to eliminate this inconvenience, the vertical enlargement / reduction amount in the cross section of the air tube must be necessarily increased, and in addition, the enlargement dimension of the air tube due to a predetermined air pressure must be set as specified. It is also necessary to accurately manufacture the thickness and length of the air tube as specified.

Further, when manufacturing a roller conveyor device in which the vertical movement amount of the pressing roller is different, the size and shape of the air tube must be changed accordingly, which causes a problem of increased manufacturing cost.

[Problems to be solved by the invention]

As a configuration for eliminating this inconvenience, Japanese Patent Laid-Open No. 61-238
In No. 603, an elevating body and
A pair of front and rear slide members attached to the lower surface of the lifting body,
The front and rear longitudinal air cylinders connected to the support member and one of the slide members are disposed on the support member, and the support member is provided with a pair of front and rear inclined members for guiding the respective slide members in the vertical direction. The configuration provided is disclosed.

However, according to this configuration, when the slide member is in the lowered position, its lower surface can contact and hold the position of the support member, but in the ascending stroke, there is nothing that regulates the ascended position of the slide member. If the extension amount of the air cylinder is too large, the ascending amount of the lifting body will be too large proportionally, and the belt, which is the propelling body, will be pressed too strongly against the rotating roller via the lifting body. Relative friction with the unnecessarily large, wear of these members prematurely,
There was a problem that durability was lost.

SUMMARY OF THE INVENTION The present invention is to provide a power disconnecting device that easily solves these conventional problems.

[Means for solving problems]

Therefore, in the present invention, an endless belt such as a belt or a chain for contacting the lower surface of the carrier roller and driving the rotation of the carrier roller is provided below the plurality of carrier rollers for carrying a load, and the endless belt is provided at a predetermined interval. In a power-interrupting device for a roller conveyor that is vertically driven so as to push the carrier roller toward the lower surface of each carrier roller, a case is arranged below the endless belt and extends in the longitudinal direction along the longitudinal direction of the endless belt. An elevating body that supports the endless belt is vertically movably mounted, and a pair of front and rear pressing bodies having a pressing portion that presses the elevating body upward is pivotally mounted on the front and rear ends of the case so as to be vertically rotatable. Wear
A pressing portion of the pressing body is formed by connecting a pair of pressing bodies with a telescopic pneumatic actuator, while forming the lower end surface of each pressing body into a downward convex mountain shape so as to contact the upper surface of the case bottom plate. Is configured to regulate the rotation angle between a position where it is pressed against the lifting body and a position away from the lifting body.

[Operation and effect of the invention]

In the present invention, the upper surface of the endless belt disposed below the carrier roller is always driven in the direction opposite to the direction of carrying the load, and the front and rear ends of the case disposed below the endless belt along its longitudinal direction. A pair of front and rear pressing bodies are pivotally attached to the section so as to be rotatable up and down, and the pair of front and rear pressing bodies are connected by a stretchable pneumatic actuator, so that the pneumatic actuator can be turned on and off according to ON / OFF of compressed air. By expanding and contracting, the pair of front and rear pressing bodies can be simultaneously rotated upward or downward.

When the pneumatic actuator is actuated, both the front and rear pressing bodies rotate upward about the shaft, and when the pair of pressing bodies rotate upward at the same time, they are lifted and lowered by the pressing portions of the pressing bodies. The body is pushed upward, and the endless belt that rides on the upper surface of the lifting body rotates and drives the plurality of carrier rollers.

When the pneumatic actuator operates in the opposite direction to the above, the pair of pressing bodies simultaneously rotate downward to lower the elevating body, and when the endless belt separates from the lower surface of the carrier roller, the length of the elevating body corresponds. The rotation drive of the plurality of carrier rollers is stopped.

In this way, the rotary drive can be turned on / off for each block of the plurality of carrier rollers arranged above it according to the length of the lifting body.

In the present invention, the expansion / contraction of the pneumatic actuator is converted into the vertical movement of the pair of front and rear pressing bodies to move the lifting body up and down according to the vertical rotation amount of the pair of pressing bodies. It is possible to arbitrarily set the ratio of the distance between the connecting point of the pneumatic actuator with respect to the axial pivot point and the point where the pressing body contacts the lifting body.

Therefore, the amount of expansion and contraction of the pneumatic actuator can be reduced to increase the vertical movement amount of the pressing body, and thus the lifting body, and the shape of the pressing body or the pin pivot point can be shared by using the pneumatic actuator in common when the design is changed. It is possible to easily change the vertical movement amount of the lifting / lowering body by simply changing.

The pneumatic actuator of the present invention expands and contracts along the longitudinal direction of the case, and like the conventional tube made of an elastic material such as rubber that expands vertically due to air pressure, the difference in the amount of expansion and contraction directly above and below is directly. Compared with the one that affects the vertical movement amount of the endless belt, the vertical dimension of the case can be made smaller, and the power disconnecting device can be made compact.

Further, the lower end surfaces of the pair of front and rear pressing bodies are formed in a downward convex mountain shape so as to contact the upper surface of the case bottom plate, so that the pressing portion of the pressing body presses the lifting body and the lifting body. Since the rotation angle is regulated to a distant position, it is possible to regulate the rotation angle of the pressing body and thus the lifting position of the pressing portion. In particular, the lifting body is raised through the pressing body. Since the positions are not limited, the relative friction between the lifting body and the endless belt will not be increased more than necessary. Therefore, the lifting body and the endless belt need not be easily worn, and the durability of the parts is improved.

〔Example〕

Next, an embodiment of the present invention will be described. Reference numeral 1 shown in FIGS. 1 and 2 indicates that a plurality of carrier rollers 3 are rotatably supported by a pair of left and right frames 2 and 2 having longitudinal lengths. 2 shows a roller conveyor in which the load 4 placed on the upper surface of the is conveyed in the direction of arrow A.

An endless belt 5 (endless chain in the embodiment) is arranged below the carrier roller 3 in a horizontal direction perpendicular to its axis, and the upper surface of the endless belt 5 advances in the direction opposite to the arrow A by a drive motor (not shown). To drive.

Reference numeral 6 is the power disconnecting device of the present invention, and the power disconnecting device 6
Is a case 7 having an upwardly open U-shaped cross section that is long in the front-rear direction along the longitudinal direction of the endless belt 5 and a downward cross-section C that is placed on the case 7 so as to be vertically movable. A vertically-shaped elevating body 8 having the same shape as the front and rear sides, and a pair of pressing bodies 10, 10 pivotally attached to the front and rear ends of the case 7 so as to be vertically rotatable.
And a pair of extendable pneumatic actuators 11 connected to the pair of pressing bodies 10, 10.

The case 7 is fixed on a support frame (not shown) between the pair of frames 2, and guide members 12 and 13 made of synthetic resin or the like are attached to appropriate positions on the outer surface of the case 7 and the inner surface of the lifting body 8. The elevating / lowering body 8 is configured to be movable only in the vertical direction.

A guide rail 14 made of synthetic resin or the like having a small friction coefficient for slidingly supporting the lower surface of the endless belt 5 is fixed to the upper surface of the lifting body 8.

A pressing body 10 pivotally mounted on a shaft 9 at the front and rear ends of the case 7.
Is formed in a substantially U-shape in plan view in which the plate piece 15 having an L-shape in plan view is connected to the bolt 17a through the connecting piece 17, and the pressing rollers 16 and 16 are formed on the upper side of the plate piece 15 on both left and right sides, respectively.
Attach. The lower portion of the pressing body 10 is pivotally supported by a shaft 9 which is inserted into a bearing 18 fixed on the bottom plate of the case 7.

Pneumatic actuator 1 connected to the pair of pressing bodies 10, 10.
In the first embodiment, a rubber tube 11a is covered with a twill cloth to reinforce the outer circumference of the tube 11a, and the front and rear ends of the tube 11a are sealed with metal connection fittings 11b and 11c. An inlet pipe 20 of a pneumatic power system 19, which will be described later, is connected via a flow passage in the one connection fitting 11b so that air can enter and leave the tube 11a.

The connection fittings 11b and 11c at the front and rear end portions of the tube 11a and the pressing bodies 10 and 10 are rotatably connected to the pins 23 and 23 via the connecting pieces 21 and 22 that are long, respectively.
When compressed air enters a, its length is reduced, while its diameter is increased.

Then, as shown in FIG. 3, the lower end surface of each pressing body 10 is formed in a mountain shape protruding downwardly below the shaft 9, and the pressing roller 1 as a pressing portion of the pressing body 10 is formed.
A position where 6 presses against the lower surface of the lifting body 8 (the highest position),
The rotation angle is regulated to a position apart from the lift 8 (lowermost position).

Coil springs 24, 24 are mounted on the connecting piece 17 of the pressing body 10 and the front and rear ends of the case 7, respectively, and both pressing bodies 10, 10 are urged in the direction in which the pressing rollers 16, 16 move downward. To do.

A contact piece 25 having a large friction coefficient such as urethane rubber is fixed to the upper surface of the attachment 5a having an inverted L-shaped cross section in the endless belt 5.

With this configuration, by controlling the pneumatic power system 19 described later, it is possible to rotationally drive or stop the plurality of carrier rollers 3 arranged at the upper position for each length of the power disconnecting device 6. Therefore, in the following, a group of a plurality of carrier rollers 3 corresponding to the power disconnecting device 6 will be referred to as one block.

As shown in FIG. 2, the pneumatic power system 19 is connected to an inlet pipe 20 in each pneumatic actuator 11 via a main pipe 27, a branch pipe 28 and a limit valve 29 from an air pressure source 26 such as a tank.

For each block of the carrier roller 3, a pair of a roller sensor 30 and a limit valve 29 is provided at an appropriate position, and the roller sensor 30 supports the lower surface of the conveyed load 4 so as to rotate downward. It is pivotally supported by 31, and is urged by a spring (not shown) so as to project upward.

When the arm 32 at the lower end of the roller sensor 30 separates from the limit valves 29 (OFF operation),
The pneumatic actuator 11 in the block upstream of the block in which the roller sensor 30 is located is only one in the transport direction.
The connection is made so as to stop the supply of compressed air to. In this case, the air in the pneumatic actuator 11 is discharged to the atmosphere from the limit valve 29.

On the contrary, when the upper end of the roller sensor 30 projects from the upper surface of the carrier roller 3 and the limit valve 29 is turned on by the arm 32 to supply air to the pneumatic actuator 11, there is no release to the atmosphere.

The pneumatic actuator 11 at the most downstream end (discharging end) of the roller conveyor 1 is controlled so as to be turned on / off in association with the next conveyor 33 or the like.
Connected to 4. The control valve 34 also operates in the same manner as the limit valves 29.

With this configuration, a motor (not shown) is driven to drive the endless belt 5. Then, in FIG. 2, when the load 4 can be transferred to the conveyor 33, which is the downstream transfer process, the control valve 34 is ON and the pneumatic pressure of the power disconnecting device 6 at the discharge end of the roller conveyor 1 is increased. As a result of the compressed air being supplied to the actuator 11 and the front-rear spacing of the pneumatic actuator 11 being reduced, the pressing bodies 10, 10 at the front and rear ends rotate upward about the shaft 9 and the respective pressing bodies 10 are rotated. When rotated to the solid line state in FIG. 3, one of the mountain-shaped surfaces at the lower end surface of each pressing body 10 contacts the upper surface of the bottom plate of the case 7, and the pressing roller 16 as the pressing portion is at the uppermost position. Stop. Then, the elevating body 8 at that location is raised by the pressing roller 16 and presses the advancing endless belt 5 against the lower surface of the carrier roller 3, whereby the carrier roller 3 of the block concerned.
Is rotationally driven (see FIGS. 3 and 4).

Luggage 4 on carrier roller 3 in roller conveyor 1
In the state where there is not, the roller sensor 30 projects upward from between the carrier rollers 3 and 3, and each limit valve 29 is ON. In this state, compressed air is supplied to the pneumatic actuators 11 ... In all the power disconnecting devices 6 in the same manner as the pneumatic actuators 11 at the discharge end of the roller conveyor 1, and the elevating / lowering body 8 is raised to cause the carrier roller 3 to move.
Is driven.

If the lower surface of the parcel 4 fed from the conveyance entrance side of the roller conveyor 1 is stepped on the roller sensor 30, the
The limit valve 29, which was N, is turned off, and the carrier roller 3 on the block side and on the downstream side of the block is driven, so that the load 4 can be conveyed in the direction of the mark A, but the power of the block on the upstream side is larger. Since the air supply to the pneumatic actuator 11 in the disconnecting device 6 is stopped and the air of the pneumatic actuator is released to the atmosphere, the length of the pneumatic actuator 11 is extended and the spring 24 is biased. The pair of front and rear pressing bodies 10 and 10 are simultaneously rotated downward, and the other mountain-shaped surface of the lower end surface of each pressing body 10 comes into contact with the upper surface of the bottom plate of the case 7 so that the pressing roller 16 is moved downward. It is regulated (see the alternate long and short dash line in FIG. 3). In this way, when pressing 16
Since the upward biasing of the lifting body 8 by the is released, the lifting body 8 descends. (See dashed line in Figure 3 and Figure 5).

The spring 24 ensures downward rotation of the pressing body 10. However, since the pressing body 10 is pushed downward by the weight of the lifting body 8 and the endless belt 5, the spring 24 is not an essential component. .

The endless belt 5 at the position where the pneumatic actuator 11 extends is separated from the lower surfaces of the plurality of carrier rollers 3 to stop the rotation drive of the carrier rollers, and at the block position, each carrier roller 3 becomes a free section in which it can freely rotate, The cargo 4 conveyed from the upstream side will invade this free section by inertia.

In this way, in the plurality of power disconnecting devices 6 arranged along the transport direction, when there is no load 4 on the upper surface of the carrier roller 3 of the downstream block, the carrier roller 3 of the upstream block is rotationally driven. When the cargo 4 is carried to the downstream side and there is a load 4 on the downstream side, the carrier roller 3 of the upstream block adjacent to the load 4 is eliminated so as to prevent the carried load 4 from colliding smoothly. It can be transported.

The pneumatic actuator 11 according to the present embodiment has a rubber tube 11a which is reinforced by covering the outer circumference with a twill cloth. Since it is connected to the pressing bodies 10 and 10 and does not come into contact with the inner surfaces of the case 7 and the elevating body 8 in any state of expansion and contraction, the outer peripheral surface of the tube 11a and the like do not wear due to friction.

Needless to say, the pneumatic actuator 11 of the present invention may be an actuator having a cylinder made of a metal cylinder and a piston rod, and the endless belt may be a belt. The case 7 may have a tubular shape whose upper surface is not open except for the pressing body 10.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a plan view of a roller conveyor, Fig. 2 is a side view, Fig. 3 is an enlarged side sectional view of an essential part of a power interrupting device, and Fig. 4 is Fig. 3. FIG. 5 is a sectional view taken along line IV-IV of FIG. 5, and FIG. 1 ... Roller conveyor, 2 ... Frame, 3 ... Carrier roller, 4 ... Luggage, 5 ... Endless belt, 6 ... Power disconnecting device, 7 ... Case, 8 ... Elevating body, 9 ... Axis, 10 ...
... Pressing body, 11 ... Pneumatic actuator, 14 ... Guide rail, 16 ... Pressing roller, 24 ... Spring, 19 ... Pneumatic power system, 26 ... Air pressure source, 29 ... Limit valve,
30 ... Roller sensor, 34 ... Control valve.

Claims (1)

[Claims] 1. An endless belt such as a belt or a chain for contacting the lower surface of the carrier roller and driving the rotation of the carrier roller is disposed below a large number of carrier rollers for carrying luggage, and the endless belt is provided at regular intervals. In a power interrupting device of a roller conveyor that is vertically driven so as to be pressed toward the lower surface of a carrier roller, a case of longitudinal length is arranged below the endless belt along the longitudinal direction thereof, and the case is An elevating body that supports the endless belt is placed movably up and down, and a pair of front and rear pressing bodies equipped with pressing portions that press the elevating body upward are pivotally mounted on the front and rear ends of the case so as to be vertically rotatable. Then, while the expandable pneumatic actuator is connected to the pair of pressing bodies, the lower end surface of each pressing body is formed in a downward convex mountain shape so as to contact the upper surface of the case bottom plate. The pressing part presses the lifting body Power Tsugidan apparatus of the roller conveyor, characterized by being configured so as to restrict the rotation angle and a position away from the location and lift.