JP2006137546A - Gravity type downward transport device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure and prevent an artificial energy from being consumed by using a gravity as an energy source. <P>SOLUTION: This gravity type downward transport device comprises a wire (towing member) 41 extending from a pulley (rotating body) 3 downward and vertically moving according to the rotation of the pulley 3, a load receiving table 5 connected to the wire 41 and vertically moving together with the wire 41, a counter wire (counter towing member) 42 extending from the pulley 3 downward and vertically moving in the reverse direction of the wire 41 according to the rotation of the pulley 3, and a counterweight 6 set to such a weight that the load receiving table 5 connected to the counterweight 42 and on which a work (carried object) W is not placed can be upwardly driven through the pulley 3 and the wire 41 and that the load receiving table 5 on which the work W is placed can be downwardly moved through the pulley 3 and the wire 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gravity-type downward conveying apparatus capable of sequentially conveying an object to be conveyed from an upper position to a lower position.

  In some cases, for example, the object to be conveyed is conveyed from a belt conveyor positioned at a predetermined height to a belt conveyor positioned one step lower than the belt conveyor. In this case, a lower conveying device is provided between the upper belt conveyor and the lower belt conveyor. Will be provided.

  In this case, the lower conveying device normally receives a conveyed object from the upper belt conveyor, conveys the conveyed object downward, and delivers it to the lower belt conveyor, and the upper and lower conveyors. And a vertical movement mechanism that can be moved to the vertical direction, and a motor or a pneumatic cylinder that drives the load receiving table up and down via the vertical movement mechanism.

  However, since the lower transfer device is provided with a device using artificial energy (for example, electric power or air pressure) such as a motor or a pneumatic cylinder as described above, the structure becomes complicated. In addition, there is a problem that it is necessary to supply artificial energy such as electric power or pneumatic pressure to the device.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the gravity-type downward conveyance apparatus which is simple structure and does not require artificial energy by using gravity as an energy source. .

  In order to solve the above-mentioned problem, the gravity-type lower transfer device according to claim 1 is wound around a rotating body arranged at an upper portion and extends downward from the rotating body, and is accompanied by rotation of the rotating body. A pulling member that moves up and down, a load receiving base that is connected to the pulling member and moves up and down together with the pulling member, and is wound around the rotating body and extends downward from the rotating body. A counter pulling member that moves up and down in a direction opposite to the pulling member as it rotates, and the empty load receiving platform that is connected to the counter pulling member and is not loaded with the object to be transported, Weight that can be driven upward via the pulling member, and that allows the load receiving table loaded with the object to be transported to move downward via the rotating body and the pulling member. With a set counterweight It is characterized in that.

  The gravity type lower transfer device according to claim 2 is the invention according to claim 1, wherein the load receiving platform is configured to be guided by a rail so as to move up and down, and the rail is located at a lower position thereof. Further, the present invention is characterized in that a dispensing guide portion is provided for inclining the cargo receiving table so as to pay out the object to be conveyed from the cargo receiving table.

  According to a third aspect of the present invention, there is provided a gravity-type lower conveying apparatus according to the first or second aspect, further comprising a braking means for limiting a moving speed of the counterweight.

  According to a fourth aspect of the present invention, in the invention according to the third aspect, the braking means is disposed so as to surround the counterweight along the moving direction of the counterweight, and the counterweight is And a cylinder for applying a braking force to the counterweight using the resistance of the fluid flowing up and down.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the cylinder is controlled by restricting the flow of the fluid generated by the movement of the counterweight at the upper end portion and the lower end portion thereof. It is characterized by having a cushion portion for increasing power.

  The up and down directions shown in the inventions described in the above claims may be the up and down direction along the vertical direction or the up and down direction along the direction inclined with respect to the vertical direction.

  According to the first to fifth aspects of the present invention, if the cargo cradle is empty, the cargo cradle moves upward and the counterweight moves downward. Therefore, for example, when the object to be transported is delivered from the upper transport means to the load receiving table, the load receiving table moves downward and the counterweight moves upward. Then, when the object to be conveyed is unloaded from, for example, the lower conveying means from the lower position of the load receiving table, the load receiving table moves upward and the counterweight moves downward due to the reduction of gravity acting on the load receiving table. Move to. Therefore, when the object to be transported is delivered from the upper transport means to the load receiving table again, the receiving table is lowered. Thereby, the conveyance work of the conveyed object mentioned above is performed repeatedly.

  Therefore, the object to be conveyed can be sequentially conveyed downward without using artificial energy such as electric power or pneumatic pressure. In addition, since devices that use artificial energy such as motors and pneumatic cylinders are not required, for example, electrical wiring, pneumatic piping, limit switches that control the cargo cradle to stop at a predetermined position, etc. This eliminates the need for incidental equipment such as a control device. Therefore, the structure becomes extremely simple and the cost can be reduced. Moreover, there is an advantage that it is possible to prevent the generation of noise and vibration associated with the operation of the above-described motor and pneumatic cylinder.

  According to the second aspect of the present invention, the load receiving platform can be stably moved in a fixed direction by the rail. In addition, since there is a discharge guide section that tilts the load receiving table at the lower position of the rail to discharge the transferred object from the load receiving table, the transferred object is automatically taken from the load receiving table that has reached the lower position of the rail. Can be paid out. Accordingly, it is possible to prevent the consumption of artificial energy such as electric power even when the object to be conveyed is delivered from the load receiving table to, for example, the lower conveying means.

  According to the invention described in claim 3, since the braking means for limiting the moving speed of the counterweight is provided, the speed at which the loaded cradle descends or the speed at which the empty cradle rises. Can be kept below a certain speed.

  According to the fourth aspect of the present invention, since the cylinder for applying the braking force to the counterweight using the resistance of the fluid flowing up and down through the counterweight is provided, the braking force is applied to the counterweight. Therefore, it is possible to prevent the occurrence of parts that cause wear. As the fluid, air in the atmosphere can be used as it is. Further, as the fluid, other gas or liquid such as oil may be used.

  According to the fifth aspect of the present invention, the upper and lower end portions of the cylinder are provided with the cushion portions that reduce the flow of fluid generated by the movement of the counterweight and increase the braking force. The counterweight can be smoothly decelerated before hitting the upper end portion or the lower end portion. Therefore, it is possible to reduce the impact when the counterweight hits the upper end portion or the lower end portion of the cylinder and stops, and the load receiving platform can be smoothly stopped at the uppermost position and the lowermost position.

  An embodiment as the best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the gravitational lower transfer device 1 shown in this embodiment includes a frame 2, a pulley (rotary body) 3 disposed on the upper portion of the frame 2, and a winding around the pulley 3. And a wire (traction member) 41 that extends downward from the pulley 3 and moves up and down as the pulley 3 rotates, and is connected to the lower end of the wire 41 and moves up and down together with the wire 41. A load receiving base 5 and a counter wire that is wound around the pulley 3 and extends downward from the pulley 3 and moves in the vertical direction opposite to the moving direction of the wire 41 as the pulley 3 rotates (counter pulling) Member) 42 and a weight that is connected to the lower end portion of the counter wire 42 and is capable of driving an empty load receiving platform 5 on which a workpiece (conveyed object) W is not loaded, via the pulley 3 and the wire 41. Well, wa Click W is in the configuration and a counterweight 6 which is set to a weight to be movable downwardly through the pulley 3 and the wire 41 a receiving platform 5 in the state of chromatic product stacked.

The frame 2 is configured on a carriage 21 including a vehicle 21a that can move on the base G.
As shown in FIGS. 3 and 4, the pulley 3 is arranged at the center between a pair of rails 22 to be described later and on the opposite side of the rail 22 from the side from which the load receiving platform 5 protrudes from the rail 22. Has been. The pulley 3 is integrally and coaxially connected to a rotation support shaft 31 with the axial direction oriented horizontally. The rotation support shaft 31 is rotatably provided on the frame 2. Only one pulley 3 is provided on the rotation support shaft 31.

  As shown in FIG. 1, the wire 41 and the counter wire 42 are constituted by a single continuous wire, and the wire 41 is the side of the pulley 3 wound in a semicircular shape and depending on one side. A counter wire 42 is provided on the other side.

  The load receiving platform 5 includes a load receiving portion 51, a support portion 52 located on the base end side of the load receiving portion 51, and four rollers 53 provided on the support portion 52.

  As shown in FIG. 4, the cargo receiving portion 51 has a rectangular upper surface portion 51 a. The load receiving portion 51 includes a roller conveyor (sliding means) (not shown) that allows the workpiece W placed on the upper surface portion 51a to move in the front-rear direction A connecting the base end portion and the distal end portion of the load receiving portion 51. It has become.

  As shown in FIGS. 1 and 3, the support portion 52 is configured integrally with the load receiving portion 51, and is L-shaped downward from the base end portion of the load receiving portion 51 with respect to the load receiving portion 51. It is formed to become. In addition, the cargo receiving portion 51 and the support portion 52 are reinforced by bracing reinforcing members 54.

  The rollers 53 are provided at the upper and lower ends of the left and right side edge portions 52a in the width direction of the support portion 52 (the direction between a pair of rails 22 described later). These rollers 53 are constituted by ball bearings attached to the respective side edge portions 52a with the rotation shafts oriented in the horizontal direction, and the hard outer rings in the ball bearings are used as they are as wheels.

  The load receiving platform 5 is guided by a pair of rails 22 installed on the frame 2 and can move up and down.

  As shown in FIG. 4, each rail 22 is formed in a U-shaped cross section by a web 22a and flanges 22b arranged on the left and right sides of the web 22a, and the inner surface of each opposed flange 22b Each roller 53 is rotatably supported.

  Further, as shown in FIG. 1, each rail 22 is integrally formed by a straight portion 221 and an inclined portion (dispensing guide portion) 222 located at the lower end portion of the straight portion 221. The straight portion 221 is formed such that the web 22a and the flange 22b extend linearly. The inclined portion 222 is formed so that at least the flange 22b opposite to the load receiving portion 51 is bent in a direction away from the load receiving portion 51 as it goes downward, and then inclined at a certain angle in this direction. The flange 22a on the cargo receiving portion 51 side may be formed to be curved and inclined similarly to the flange 22b.

  Each rail 22 is installed so that the straight portion 221 extends in the vertical direction, and guides in the vertical direction while holding the load receiving portion 51 positioned in the straight portion 221 horizontally. With respect to the load receiving platform 5 moved to the inclined portion 222, the load receiving portion 51 is inclined so that the tip end portion is downward so that the workpiece W can be discharged from the load receiving portion 51.

  The counterweight 6 is made of a metal having a large specific gravity, such as steel, and is formed in a substantially cylindrical shape. The counterweight 6 is guided by a guide shaft 71 extending in the vertical direction so as to be movable in the vertical direction. For this reason, the counterweight 6 has a through hole (not shown) in which the guide shaft 71 is movable in the axial direction at the axial center thereof, and guide shafts at the upper and lower ends of the through hole. A bearing (not shown) that is movable in the axial direction with respect to 71 is provided. In addition, the counterweight 6 is formed with a flange portion 6b that is coaxially expanded at the lower end portion of the outer peripheral surface 6a having a constant diameter.

  The guide shaft 71 is formed by a straight steel rod having a circular cross section, and is installed in the cylinder 7 and coaxially with the cylinder 7.

  The cylinder 7 includes a cylindrical portion 7a that is vertically installed on the frame 2 so as to surround the counterweight 6 along the moving direction of the counterweight 6, and the counterweight 6 that moves up and down in the cylindrical portion 7a. A braking force is applied to the counterweight 6 using the fluid resistance of the air (fluid) flowing up and down via the. That is, the cylinder 7 serves as a braking means for limiting the moving speed of the counterweight 6 by utilizing the fluid resistance of the air flowing through the gap between the inner surface of the cylindrical portion 7 a and the outer surface of the counterweight 6.

  Further, the cylinder 7 is provided with cushion portions 7b and 7c at its upper end and lower end to increase the braking force by restricting the air flow (movement flow rate) generated by the movement of the counterweight 6.

  The cushion portion 7b on the upper end side is formed by a concave portion having a circular cross section formed slightly larger in diameter than the outer peripheral surface 6a of the counterweight 6, and the air that has lost its place due to the ingress of the counterweight 6 is cushioned portion 7b. A large braking force is applied to the counterweight 6 by utilizing a large fluid resistance caused by flowing through a narrower space between the outer circumferential surface 6a and the outer peripheral surface 6a, and the upper end surface of the counterweight 6 is the upper end surface of the cushion portion 7b. The counterweight 6 is sufficiently decelerated before it comes into contact with the counterweight 6 and stops. That is, the cushion portion 7b relieves shock when the counterweight 6 moving upward stops at the upper end stop position.

  The cushion portion 7c on the lower end side is formed by a concave portion having a circular cross section formed in a slightly larger diameter than the outer peripheral surface of the flange portion 6b in the counterweight 6, and air that has lost its place due to the intrusion of the flange portion 6b. A large braking force is applied to the counterweight 6 using a large fluid resistance when flowing through a narrower space between the cushion portion 7c and the flange portion 6b, and the lower end surface of the counterweight 6 is the cushion portion 7c. The counterweight 6 is sufficiently decelerated before coming into contact with the lower end surface of the counterweight 6 and stopping the counterweight 6. That is, the cushion portion 7c relieves shock when the counterweight 6 moving downward is stopped at the lower end stop position.

  1, 2, and 4, reference numeral 8 denotes a cover that surrounds the periphery of the load receiving platform 5 that moves up and down and prevents the workpiece W from falling from the load receiving portion 51. The cover 8 is preferably made of a member such as a transparent plate, a wire mesh, a punching metal, or the like that can visually recognize the lifted state of the load receiving platform 5.

  In the gravity-type lower transfer device 1 configured as described above, if the load receiving platform 5 is empty, the load receiving platform 5 moves upward due to the weight of the counterweight 6, and the counterweight 6 is moved downward. Will be moved to. In this case, since the counterweight 6 receives the braking force due to the fluid resistance in the cylinder 7, the speed at which the load receiving platform 5 is raised can be suppressed to a certain speed or less.

  When the flange portion 6b of the counterweight 6 enters the cushion portion 7c on the lower end side, a larger braking force acts on the counterweight 6, and the counterweight 6 is sufficiently decelerated, and then the counterweight 6 When the lower end surface of the abutment comes into contact with the lower end surface of the cushion portion 7c, the counterweight 6 stops and the load receiving platform 5 stops at the upper load receiving position (uppermost position) C1.

  Therefore, when the workpiece W is delivered from the upper belt conveyor (upper conveying means) B1 arranged at the upper position to the load receiving table 5, the load receiving table 5 side becomes heavier than the counterweight 6 side. As counter 5 moves downward, counterweight 6 moves upward.

  Also in this case, since the counterweight 6 receives a braking force due to fluid resistance in the cylinder 7, the speed at which the load receiving platform 5 descends can be suppressed to a certain speed or less.

  When the portion of the outer peripheral surface 6a of the counterweight 6 enters the cushion portion 7b on the upper end side, a larger braking force acts on the counterweight 6, and the counterweight 6 is sufficiently decelerated, and then the counterweight 6 When the upper end surface of the weight 6 comes into contact with the upper end surface of the cushion portion 7b, the counterweight 6 stops and the load receiving platform 5 stops at the lower delivery position (lowermost position) C2.

  In this case, the load receiving platform 5 is guided by the linear portion 221 of the rail 22 and descends vertically, and then is guided by the inclined portion 222 so that the load receiving portion 51 is inclined to the extent that the workpiece W can be paid out, and then the lower side. It stops at the unloading position C2.

  If it does so, the workpiece | work W will be delivered by gravity to lower belt conveyor (lower conveyance means) B2 arrange | positioned in the lower position from the receiving stand 5. FIG. At this time, the workpiece W receives the conveying force from the belt when the tip of the workpiece W comes into contact with the belt of the lower belt conveyor B2, so that the workpiece W is smoothly delivered to the lower belt conveyor B2. become.

  While the workpiece W is moving to the lower belt conveyor B2, the weight of the workpiece W acting on the load receiving platform 5 gradually decreases, but the outer peripheral surface 6a of the counterweight 6 is inserted into the cushion portion 7b. Therefore, the counterweight 6 does not immediately come off from the cushion portion 7b due to a decrease in the load acting on the load receiving platform 5. For this reason, the load receiving platform 5 does not rise suddenly while the workpiece W moves to the lower belt conveyor B2.

  That is, after the workpiece W is unloaded to the lower belt conveyor B2, the counterweight 6 is completely pulled out from the cushion portion 7b, and the load receiving platform 5 is lifted in a state of being limited to a certain speed or less. Then, after the load receiving platform 5 moves to the upper load receiving position C1, the workpiece W is unloaded from the upper belt conveyor B1 to the load receiving platform 5, whereby the load receiving platform 5 is lowered again. Thereby, the conveyance work below work W mentioned above is repeated.

  Therefore, the workpieces W can be sequentially conveyed downward from the upper belt conveyor B1 to the lower belt conveyor B2 without supplying artificial energy such as electric power or pneumatic pressure. Moreover, since a device using artificial energy such as a motor or a pneumatic cylinder is not required, for example, electric wiring, pneumatic piping, a limit switch for controlling the receiving platform 5 to stop at a predetermined position, and the like. This eliminates the need for incidental equipment such as a control device. Therefore, the structure becomes extremely simple and the cost can be reduced. In addition, there is an advantage that generation of noise and vibration associated with the operation of the motor, the pneumatic cylinder and the like can be prevented.

  Moreover, since the inclined part 222 which inclines the said load receiving stand 5 in order to pay out the workpiece | work W from the load receiving stand 5 is provided in the downward position of the rail 22, the load receiving stand 5 is supplied, without supplying any artificial energy. The workpiece W can be delivered to the lower belt conveyor B2. Therefore, even when the workpiece W is delivered from the load receiving platform 5 to the lower belt conveyor B2, the consumption amount of artificial energy such as electric power can be reduced to zero.

  Further, since the cylinder 7 for limiting the moving speed of the counterweight 6 is provided, the speed at which the loaded cradle 5 is lowered and the speed at which the empty cradle 5 is raised are set below a certain speed. Can be suppressed. Therefore, the cargo receiving platform 5 can always be raised and lowered at a safe speed.

  In addition, since the braking force is applied to the counterweight 6 using the resistance of the fluid due to air, it is possible to prevent the occurrence of parts that cause wear by applying the braking force to the counterweight 6. it can.

  Furthermore, since the cushion portions 7 b and 7 c are provided at the upper end portion and the lower end portion of the cylinder 7, the impact when the counterweight 6 hits against the upper end portion or the lower end portion of the cylinder 7 and stops can be reduced.

  Further, the cushion portions 7b and 7c can smooth the movement when the counterweight 6 starts to move upward or downward. Therefore, after the workpiece W is supplied to the load receiving platform 5 at the upper load receiving position C1, it is possible to prevent the load receiving platform 5 from dropping rapidly, and at the lower unloading position C2, the workpiece W is moved to the lower belt. It is possible to prevent the cargo receiving platform 5 from rising suddenly during delivery to the conveyor B2.

  On the other hand, since the whole is constituted on the carriage 21, even if the upper belt conveyor B1 and the lower belt conveyor B2 are rearranged, the installation position of the gravity-type lower conveying device is accompanied by the rearrangement. There is an advantage that can be changed freely.

  In the above embodiment, an example is shown in which one pulley 3 is provided at the center position between the pair of rails 22 (that is, the position corresponding to the center in the width direction of the support portion 52). As in the first other example shown in FIG. 5, one (two in total) may be provided at a position corresponding to each end of the support portion 52 in the width direction. In the first other example, each pulley 3 is integrally connected to the rotation support shaft 31 coaxially, and the counterweight 6, the cylinder 7, the guide shaft 71, etc. also correspond to each pulley 3. It is provided at each position. However, the illustration of the counterweight 6, the cylinder 7, the guide shaft 71, etc. is omitted.

  In the first other example, the cargo receiving portion 51 can be stably supported by the wires 41 and 41 connected to the respective end portions in the width direction of the support portion 52. Further, since the upper belt conveyor B1 can be disposed between the pulleys 3, the dimension from the upper conveyance surface of the upper belt conveyor B1 to the upper load receiving position C1 can be reduced.

  Further, even when two pulleys 3 are provided as described above, the counter weight 6, the cylinder 7, the guide shaft 71, etc. are each provided as in the second other example shown in FIG. 6. Also good.

  However, instead of each pulley 3, each drum (rotating body) 3 that can be wound by winding the wire 41 independently is used. Each drum 3 is integrally connected to the rotation support shaft 31 coaxially. Further, a third drum (rotating body) 33 is integrally connected coaxially to the outside of the rotation support shaft 31 between the drums 3. In this case, the third drum 33 can be wound by winding a counter wire 42 that is completely separated from the wire 41, and a rotational driving force is obtained by the counterweight 6 connected to the lower end portion. It is like that.

  The counterweight 6 has a weight capable of driving the empty load receiving platform 5 on which the work W is not loaded upward and a weight allowing the load receiving platform 5 loaded with the work W to move downward. Is set to

  In the second other example, the number of counterweights 6 and the like is limited to one, so that the structure can be simplified and the cost can be reduced as compared with the first other example. .

  In addition, a sprocket (rotating body) is used instead of the pulley 3 described above, and a chain (traction member) or a counter chain (counter pulling member) that can be wound around the sprocket is used instead of the wire 41 or the counter wire 42 described above. You may make it use.

It is a principal part fracture | rupture front view of the gravity type downward conveying apparatus shown as one embodiment of this invention. It is a front view which shows the external appearance of the gravity type downward conveying apparatus. It is a principal part side view which shows the gravity type downward conveying apparatus. It is a principal part top view which shows the gravity type downward conveying apparatus. It is a principal part side view which shows the 1st other example of the gravity type downward conveying apparatus. It is a principal part side view which shows the 2nd other example of the same gravity type downward conveying apparatus.

Explanation of symbols

1 Gravity type lower transfer device 3 Pulley, drum (rotating body)
5 Cargo stand 6 Counterweight 7 Cylinder (braking means)
7b, 7c Cushion part 22 Rail 33 Drum (Rotating body)
41 Wire (traction member)
42 Counter wire (Counter pulling member)
222 Inclined part (dispensing guide part)
W Workpiece (conveyed object)

Claims (5)

A traction member wound around a rotating body arranged at the top and extending downward from the rotating body and moving up and down with the rotation of the rotating body;
A cradle connected to the traction member and moving up and down together with the traction member;
A counter traction member wound around the rotator and extending downward from the rotator and moving up and down in a direction opposite to the traction member with the rotation of the rotator;
The transported object is loaded with a weight that is connected to the counter pulling member and is capable of driving the empty load receiving platform on which the transported object is not stacked via the rotating body and the pulling member upward. And a counterweight set to a weight that allows the load receiving table in a loaded state to move downward through the rotating body and the pulling member. The cargo receiving platform is configured to be movable up and down guided by a rail,
2. The gravity-type lower transfer device according to claim 1, wherein the rail includes a discharge guide portion for inclining the load receiving table to discharge the object to be transferred from the load receiving table at a position below the rail. .   The gravity-type downward conveying apparatus according to claim 1 or 2, further comprising braking means for limiting a moving speed of the counterweight.   The brake means is disposed so as to surround the counterweight along the direction of movement of the counterweight, and a cylinder that applies a braking force to the counterweight using the resistance of fluid flowing up and down through the counterweight The gravity-type downward conveying apparatus according to claim 3, comprising:   5. The gravity according to claim 4, wherein the cylinder includes a cushion portion that increases a braking force by restricting a flow of the fluid generated by the movement of the counterweight at an upper end portion and a lower end portion thereof. Type downward conveying device.

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