JP2007191257A - Non-powered downward conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an non-powered downward conveying device capable of performing smooth downward conveying by an approximately uniform downward conveying time even when articles to be conveyed of various weights are fed at random. <P>SOLUTION: The non-powered downward conveying device is provided with a circular disc member 4a arranged above a feeding position 1; a traction member 7 wound on the circular disc member; a garbage placement base 6 fixed to the feeding position side of the traction member; and a speed adjustment means provided on the other end of the traction member. The speed adjustment means has a cylindrical cylinder 9 with a bottom; a piston 10 liftably provided in the cylinder 9 and connected with the other end of the traction member; a hole part bored on a top plate of the piston; a valve member advanceably/retreatably provided on the hole part and closing the hole part when a lower space of the piston becomes a negative pressure; and an urging means for urging the valve member in a direction retreated from the hole part. It is set such that load applied to the other end of the traction member becomes a weight of the baggage placement base or heavier. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a non-powered descent conveying device for conveying an object to be conveyed from its upper supply position to its lower discharge position without any power using its own weight.

  In general, when moving a product such as a product in a vertical direction in a building such as a factory or a building, a transport device such as an elevator that moves the product up and down by a drive source such as an electric motor or a hydraulic motor is used. It has been.

  By the way, in such a lifting and lowering transfer device, the use is limited to, for example, the case where the object to be transferred such as goods stored on the upper floor of the warehouse is used only for the purpose of lowering to the ground at the time of unloading. When it is limited to the lowering conveyance of the conveyed object, a simple device can be used without using a driving source such as an electric motor or a hydraulic motor by using the weight of the conveyed object to lower it without power. Thus, the object to be conveyed can be conveyed downward.

  However, as is well known, when the transported object is lowered from the upper floor to the lower floor only by its own weight, the descent speed increases in proportion to the passage of time due to the gravitational acceleration. As a result, when a heavy object to be conveyed is lowered and conveyed, there is a drawback that when the object reaches the lower floor, the object to be conveyed is subjected to a large impact and is damaged.

  Therefore, it is conceivable to provide a wire or the like for lowering the object to be transported with a resistance to reduce its traveling speed to suppress an increase in the descending speed. When lowering an object, there arises a problem that the conveyance time becomes extremely long. For this reason, it is necessary to adjust the magnitude | size of the said resistance with some control means each time according to the weight of a to-be-conveyed object, and there exists a problem that the installation for the said control will become complicated.

  In Patent Document 1 below, when a heavy load exceeding a steady load range or higher is lifted or lowered in an adjustable weight elevator, etc., a water tank is provided as a counterweight for the lift cabin, and the water in the upper water tank is provided to this. An energy-saving and mini-powered operation system has been proposed in which a mechanism for injecting and draining water is provided so that the counterweight can be adjusted freely.

However, the driving system adjusts the number of passengers in the elevator, the balance state corresponding to the weight of the luggage, etc. by adjusting the counterweight with the above-mentioned adjusting and counterweight device, mini power operation, The operation and the energy recovery operation can be performed, and similarly, it is impossible to perform the speed control accompanying the lowering of the elevator. Moreover, it is difficult to cope with a case where a heavy and light weight transported object is supplied at random.
JP 2001-019317 A

  The present invention has been made in view of such circumstances, and even when a transported object with various weights is supplied at random when transporting the transported object with its own weight and moving down without power, it is almost It is an object of the present invention to provide a non-powered descent conveying apparatus that can perform a smooth descent conveyance with a uniform descent time.

  In order to solve the above-described problem, the invention according to claim 1 is a non-powered descent transport that transports a transported object placed on a loading platform at an upper supply position to a lower discharge position by its own weight. A disk member rotatably disposed above the supply position, a traction member wound around the disk member so as to run freely, and fixed to the supply position side of the traction member. And a speed adjusting means provided at the other end of the pulling member that rises as the loading base descends. The speed adjusting means is provided in the vertical direction. A cylinder member having a bottom cylindrical shape, a piston member provided in the cylinder member so as to be movable up and down, and connected to the other end of the pulling member, and a piston member drilled in the top plate of the piston member. Communicating with the space below And a valve member that is provided in the hole so as to be able to advance and retreat, and is sucked when the space below the piston member becomes negative pressure to close the hole, and a direction in which the valve member is retracted from the hole And a load acting on the other end of the traction member is set to be equal to or greater than the weight of the loading platform described above. .

  According to a second aspect of the present invention, in the first aspect of the present invention, the piston member is moved between the outer periphery of the piston member and the inner wall of the cylinder member by lowering the lightest object to be conveyed. A gap is formed through which a smaller amount of air can flow than the increase in capacity in the space below the piston member when the air pressure rises.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the piston member has the top plate and a body portion that hangs down in a cylindrical shape from the outer periphery of the lower surface of the top plate. And one or more counterweights are detachably provided on the inner wall of the body.

  In the invention according to any one of claims 1 to 3, when the object to be transported is placed on the loading platform at the upper supply position, the pulling member travels around the disk member by its own weight, and the object to be transported is The loading platform on which the load is placed descends. Then, the piston member fixed to the other end of the pulling member rises in the cylinder member as the conveyed object descends. At this time, since the valve member is urged by the urging member in a direction of retreating from the hole of the top plate of the piston member, when the descending speed of the transported object is small, the valve member is externally connected through the hole. Air flows into the space below the piston member.

  Then, when the lowering speed is increased by gravity acceleration due to the lowering of the loading platform described above, the space below the piston member gradually becomes negative pressure, thereby the valve member resists the biasing force of the biasing member. As the holes are gradually closed, the inside of the space becomes more negative. As a result, the ascending speed of the piston member, that is, the descending speed of the conveyed object is reduced.

  As a result, even when transported objects of various weights are supplied at random, as the transported object descends due to its own weight, the descent speed is suppressed from increasing excessively, and the descent time is reduced. By making it uniform, smooth descent conveyance can be performed.

  Further, when the loading table descends to the discharge position and the object to be conveyed is removed from the loading table, the traction member is moved up to that time by the load of the piston member or the like applied to the other end of the traction member. Starts traveling in the direction of raising the loading platform in the opposite direction. Then, since the valve member moves in the direction of opening the hole by the biasing means, the air in the space below the piston member is exhausted to the outside through the hole. For this reason, an empty loading platform can be returned to the supply position again.

  In addition, when the conveyed object is descending at a low speed, external air is introduced into the space below the piston member that gradually increases its capacity through the hole, and when the descending speed increases, In order to suck the valve member with a negative pressure in the space, it is necessary to appropriately set the opening area of the hole, the stroke of the valve member, and the urging force of the urging member. When the width of the weight is large, it may be difficult to obtain a desired descent speed suppressing effect for all the objects to be conveyed.

  In this regard, according to the second aspect of the present invention, the space in the space when the piston member ascends by the lowering of the lightest article to be conveyed between the outer periphery of the piston member and the inner wall of the cylinder member in advance. Since a gap is formed in which a smaller amount of air than the increase in capacity can flow, when the piston member rises, a constant amount of external air is constantly passed through the gap below the piston member. Therefore, the valve member does not operate until a constant lowering speed is reached, so that it is possible to adapt to the conveyance of an object to be conveyed in a wide weight range.

  In addition, in the invention according to claim 3, since one or more counterweights are detachably provided on the inner wall of the body of the piston member, the weight range of the object to be conveyed is changed or lowered. Even when the conveyance height to be increased or decreased or when it is desired to increase or decrease the lowering speed than the initial apparatus setting, it is possible to easily cope with this by increasing or decreasing the counterweight.

1 to 4 show an embodiment of a non-powered descent conveying apparatus of the present invention. This non-powered descent conveying apparatus (hereinafter abbreviated as a conveying apparatus) is temporarily stored on an upper floor of a warehouse or the like, for example. This is used when the transported object W such as a finished product or commodity is transported down to the ground when it is unloaded.
In these figures, reference numeral 1 in the drawings is the supply position of the conveyed object W provided on the upper floor, and reference numeral 2 is the discharge position of the conveyed object W provided on the ground.

A transport space extending in the vertical direction is formed between the supply position 1 and the discharge position 2, and the transport device 3 is provided in the transport space.
That is, sprockets (disk members) 4a and 4b are respectively arranged in the up and down direction above the supply position 1 and below the discharge position 2 in the transport space, and are provided rotatably around the horizontal axis. Yes. An endless chain 5 that engages with teeth formed on the outer periphery of the sprockets 4a and 4b is wound around the sprocket 4a and 4b.

Here, on the supply position 1 and discharge position 2 side of the chain 5 (hereinafter referred to as the conveyance side), there is a loading platform 6 made of an L-shaped plate material on which the article to be conveyed W is placed on the horizontal portion. It is fixed.
Further, one end portion 7 a of a wire (traction member) 7 is connected to a position near the loading platform 6 of the chain 5. The wire 7 is extended to the back side with respect to the conveying side by a pulley 8 and is suspended downward along the chain 5. A speed adjusting means is provided at the other end 7 b of the wire 7.

The speed adjusting means includes a cylinder (cylinder member) 9, a piston (piston member) 10 provided in the cylinder 9 so as to be movable up and down, and a valve member 11 provided on a top plate 10 a of the piston 10. It is roughly structured.
Here, the cylinder 9 is a bottomed cylindrical member in which a bottom portion 9a and a cylindrical portion 9b are formed of aluminum or the like, and is disposed along the chain 5 on the back side.

  As shown in FIGS. 3 and 4, the piston 10 is formed by integrating a top plate 10a and a body portion 10b that hangs down cylindrically from the outer peripheral edge of the bottom surface of the top plate 10a. Is formed with a circular hole 12 penetrating the disk 10a in the vertical direction. In addition, the outer peripheral wall of the hole 12 is formed in a tapered shape whose inner diameter gradually decreases from the upper side to the lower side.

  A lid 13 is integrally formed on the top plate 10 a of the piston 10. The lid portion 13 includes an outer cylinder 13a erected so as to surround the hole portion 12, a top plate 13b that closes an upper end portion of the outer cylinder 13a, and a support that is suspended from the center portion of the top plate 13b. It is composed of a flange 13c and a ring-shaped guide plate 13d disposed in the lower part of the outer cylinder 13a. The top plate 13b has a plurality of holes 13e communicating with the inside and outside of the lid body 13. It has been drilled. In the lid 13, the valve member 11 is provided so as to be movable forward and backward with respect to the hole 12.

  The valve member 11 includes a cylindrical main body 11a in which the support rod 13c is inserted in the center and an outer peripheral portion guided by a guide plate 13d, and a valve body 11b integrated with a lower end portion of the main body 11a. The lower surface of the valve body 11b is formed in an inclined surface shape that matches the taper of the outer peripheral wall of the hole 12. Between the main body 11a of the valve member 11 and the guide plate 13d of the lid body 13, a spring 14 (biasing means) for biasing the valve member 11 in the direction of retreating from the hole 12 is interposed. .

An eyebolt 15 is attached to the center of the top plate 13 b of the lid 13, and the other end 7 b of the wire 7 is attached to the eyebolt 15.
Further, an internal thread portion 16 is screwed on the inner wall of the body portion 10 b of the piston 10. A plurality (three in the figure) of an annular counterweight 17 is detachably provided on the female screw portion by screwing male screws screwed on the outer periphery thereof.

  Incidentally, the number of the counterweights 17 is such that the load acting on the other end 7b of the wire 7, that is, the total weight of the piston 10, the valve member 11, the lid 13 and the counterweight 17 is equal to or more than the weight of the loading platform 6. It is set to be.

  On the other hand, a gap d is formed between the outer periphery of the body 10 b of the piston 10 and the inner wall of the cylinder 9. This gap d is larger than the amount of increase in the capacity in the space S below the piston 10 when the piston 10 rises as the lightest article W to be conveyed among the plurality of articles to be conveyed descends. The dimensions are such that a small amount of air can flow.

  In the transport apparatus having the above-described configuration, first, as shown in FIG. Is placed, the chain 5 travels between the sprockets 4a and 4b by the weight of the object W to be transported, the transport side chain 5 moves downward, and the back side chain 5 rises. The loading table 6 on which the article W to be transported is lowered.

  In parallel with this, the wire 7 receives a tensile force by the pulley 9a and the other end 7b rises, so that the piston 10 fixed thereto rises in the cylinder 9. At this time, external air first flows into the space 9 below the piston 10 from the gap d between the piston 10 and the cylinder 9. In addition, since the valve member 11 is urged by the spring 14 in the direction of retreating from the hole 12 formed in the top plate 10a of the piston 10, the loading table 6 on which the article W to be transported at the initial stage of transportation is placed. When the lowering speed of the piston 10, that is, the rising speed of the piston 10 is small, external air flows into the space S below the piston 10 through the hole 13 e of the lid 13 and the open hole 12.

  Next, as the loading platform 6 descends, the descending speed gradually increases due to gravitational acceleration. Then, since the increase in the capacity of the space S due to the rise of the piston 10 wins over the amount of air flowing into the space S through the gap d and the hole 12 between the piston 10 and the cylinder 9, the above-mentioned gradually. The space S gradually becomes negative pressure. As a result, the valve member 11 is sucked against the urging force of the spring 14, the hole 12 is gradually closed, and finally closed by the valve body 11b as shown in FIG. As a result, since the air flowing into the space S is only through the gap d between the piston 10 and the cylinder 9, the negative pressure in the space S prevents the piston 10 from rising, and the conveyed object The descending speed of the loading platform 6 on which W is placed is reduced.

  Thus, according to the said conveying apparatus, even when the to-be-conveyed object W of various weight is supplied on the loading platform 6 at random, as the to-be-conveyed object W falls by the dead weight, gravity acceleration By suppressing the descent speed from increasing excessively and making the speed uniform, smooth descent conveyance can be performed. At this time, by appropriately adjusting the number of the counterweights 17, it is possible to set the lowering speed and the lowering of the lowering speed within the optimum range according to the weight range of the object W to be transported. Become.

  Further, when the loading table 9 is lowered to the discharge position 2 as shown in FIG. 2 and the conveyed object W is removed from the loading table 6, the piston 10 and the counter added to the other end portion 7b of the wire 7 are removed. The chain 5 starts traveling in the direction in which the loading platform 6 is lifted in the opposite direction to that of the chain 5 by the load such as the weight 17. Then, since the valve member 11 moves in a direction to open the hole 12 by the spring 14, the air in the space S below the piston 10 causes the gap d between the piston 10 and the cylinder 9 and the holes 12, 13e. It is exhausted to the outside through. For this reason, the empty loading platform 6 can be returned to the supply position 1 as shown in FIG.

  In the above embodiment, only when the sprockets 4a and 4b are used as the disk members, the chain 5 is wound between them, and one end of the wire 7 serving as the pulling member is fixed to the chain 5. Although described above, the present invention is not limited to this. For example, a single grooved wheel may be used as the disk member, and a belt or the like serving as the traction member may be wound around the wheel.

  In order to verify the operation and effect of the transport device according to the present invention, as shown in FIG. 5, the load G of the object to be transported and the load W of the loading table are applied to one end portion of the wire 21 laid between the rollers 20. In the case where the other end portion of the wire 21 is provided with the piston 23 of the load C in the speed adjusting means having the same structure as that of FIG. 3, the load W is changed and the drop of L = 172 cm is lowered. And the negative pressure of the space S in the cylinder 22 were measured. The inner diameter D of the cylinder 22 is 40φ, and the outer diameter of the piston is 39φ.

At this time, when the hole 12 shown in FIG. 3 was first closed, as shown in FIG. 6, when the drop weight was less than 1000 g, an extremely long drop time was required. It has been found that when the effective weight is more than that, it falls in about 2 seconds or less.
Next, when the weight of descent was 1000 g or less, the hole 12 was opened and the same descent experiment was performed. As a result, both could be lowered in 3 seconds or less.

Therefore, in comparison with the graph showing the negative pressure in the space S in FIG. 7, the elasticity of the spring 14 is selected so that the valve member 11 closes the hole 12 when the negative pressure becomes about 100 mmH ₂ O. Thus, it can be understood that the object to be conveyed in a wide weight range can be conveyed with substantially the same descent time.

It is a schematic block diagram which shows one Embodiment of the non-power-falling conveying apparatus of this invention. It is a figure which shows the state which lowered | hung the to-be-conveyed object in the non-power-falling conveying apparatus of FIG. It is an expanded sectional view of the III section of FIG. It is an expanded sectional view of the IV section of FIG. It is a schematic block diagram which shows the apparatus used for the Example of this invention. It is a graph which shows the experimental result of the magnitude | size of descent load and descent time in the Example of this invention. It is a graph which shows the experimental result of the magnitude | size of the descent | fall load and the negative pressure in a cylinder in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Supply position of to-be-conveyed object 2 Discharge position of to-be-conveyed object 3 Conveyance apparatus 4a, 4b Sprocket (disk member)
6 Loading platform 7 Wire (traction member)
7a One end of the wire 7b The other end of the wire 9 Cylinder (cylinder member)
10 Piston (Piston member)
10a Top plate 10b Body 11 Valve member 12 Hole 14 Spring (biasing member)
d Gap S Space below the piston

Claims (3)

A non-powered descent conveying device that conveys an object to be conveyed placed on a loading platform at an upper supply position to a lower discharge position by its own weight,
A disk member rotatably disposed above the supply position; a traction member wound around the disk member so as to run freely; and the loading platform fixed to the supply position side of the traction member; And a speed adjusting means provided at the other end of the pulling member that rises as the loading platform descends,
The speed adjusting means includes a bottomed cylindrical cylinder member disposed in the vertical direction, a piston member provided in the cylinder member so as to be movable up and down, and connected to the other end of the traction member; A hole formed in the top plate of the piston member to allow the space below the piston member to communicate with the outside, and provided in the hole so as to be able to move forward and backward. The space below the piston member became negative pressure. A valve member that is sucked at the time and closes the hole, and an urging means that urges the valve member in a direction to retreat from the hole, and acts on the other end of the traction member A non-powered descent conveying device characterized in that the load is set to be equal to or greater than the weight of the loading platform described above.   Between the outer periphery of the piston member and the inner wall of the cylinder member, an amount smaller than the increase in capacity in the space below the piston member when the piston member ascends due to the fall of the lightest article to be conveyed 2. A non-powered descent conveying apparatus according to claim 1, wherein a gap through which the air is allowed to flow is formed.   The piston member includes the top plate and a body portion that hangs in a cylindrical shape from the outer periphery of the bottom surface of the top plate, and one or more counterweights are detachably provided on the inner wall of the body portion. The powerless descent conveying device according to claim 1, wherein the powerless descent conveying device is provided.

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