JPH0650412Y2 - Unit lifting device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to the middle of a transfer line to temporarily stop or change the direction of a transfer object, or to be mounted on a table of a press machine to carry in, stop, carry out or clamp a work piece. The present invention relates to a lifting device for a unit to be used as a means or the like.

[0002]

2. Description of the Related Art FIGS. 6 to 9 show a conventional example of a transport unit. In FIG. 6, reference numeral 1 denotes a transport unit, in which a rotating body 3 such as a roller or a ball is rotatably mounted on a unit body 2 at regular intervals, and a part of the rotating body 3 is projected from the upper surface of the body 2 The heavy object placed on the carriage is transported by utilizing the rolling of the rotating body 3.

A base 5 on which the carrying unit 1 is mounted has a bottom plate 4, a plurality of air cylinders 6 are provided in the base 5, and pistons 7 mounted in the respective air cylinders 6 are provided. The upper piston rod 8 is exposed on the base 5 through the vertical hole, and the unit body 2 is fixed to the upper end of the rod 8 by using a bolt 9. And the cylinder 6
The lower end of the base and the air supply / exhaust port 10 at one end of the base 5 are connected by an air passage 11. A compression spring 12 is mounted between the piston 7 and the upper surface of the cylinder 6.

The above-mentioned conventional transport unit 1 is mounted and fixed together with the base 5 in a plurality of concave grooves 14 formed in parallel with the table 13 as shown in FIG. When the air supply pipe is connected and the supply / exhaust port 10 is opened to the outside air by the switching valve, the unit main body 2 is in the lowered position as shown in FIG. 6 due to its own weight or the compression spring 12,
At this time, since the upper surface of the table 13, that is, the support surface 15 is above the upper side of the rotating body 3, the heavy load on the support surface 15 is directly placed on the support surface 15.

Next, when the switching valve is switched and the compressed air supplied from the compressor or the like is sent into the passage 11 from the air supply / exhaust port 10, the pressure pushes the piston 7 up, and the unit body 2 is moved through the rod 8. As shown in FIG. 8, the upper side of the rotating body 3 projects upward on the support surface 15 to lift the heavy object, so that the heavy object can be easily conveyed and turned by the rotation of the rotating body 3.

In the conventional example shown in FIG. 9, the compression spring 12 of the conventional example of FIG. 6 is omitted, and instead, an exhaust port 16 is provided at the end of the base 5, and the exhaust port 16 and the upper end of the cylinder 6 are provided. Air passage 17
The other structure is the same as that of FIG.

In the above structure, when the unit body 2 is raised, the switching valve is operated to supply compressed air to the air supply / exhaust port 10 and open the exhaust port 16 to the atmosphere. Further, in order to lower the unit 1, it suffices to open the air supply / exhaust port 10 to the atmosphere for exhausting by operating the switching valve and to supply the compressed air to the exhaust port 16 for supplying air.

[0008]

In any of the conventional devices as described above, the piston 7 is pushed up by the pressure of compressed air. The pushing force at this time is compressed air pressure × cylinder area × number of cylinders.

Therefore, if the weight of the heavy object on the support surface 15 becomes large, the pressure of the fluid must be increased, or the area and number of the cylinders 6 must be increased. The booster (pressure booster) used in the formula is required, and the piping and the like must withstand high pressure. Further, increasing the area or the number of the cylinders 6 has a problem in terms of space.

In view of the above-mentioned prior art, the object of the present invention is to provide a high thrust without changing the size and number of air cylinders from the conventional one, while maintaining the compressed air pressure as before. It is an object of the present invention to provide a lifting device for a unit that allows a certain object to be handled freely and is compact and has a simple structure.

[0011]

In order to achieve the above-mentioned object, the present invention provides an oil chamber in a unit body in which a plurality of rotating bodies are mounted, and an upper portion and a lower portion having a diameter larger than the oil chamber. Cylinders are arranged above and below the oil chamber so that the rod of the upper cylinder and the piston of the lower cylinder face each other and face the oil chamber, and the rear space of the piston of the upper cylinder communicates with the pressure fluid supply source. Provided is an elevating / lowering device for a unit in which the tip of the rod of the lower cylinder is arranged so as to project from the bottom surface of the unit body toward the concave groove of the table.

[0012]

Since the unit lifting device according to the present invention has the above-mentioned structure, when the unit body is disposed in the article mounting table concave groove, when the piston of the upper cylinder is lowered by the pressure fluid, the operation in the oil chamber is performed. The oil is pushed down, and the rod of the lower cylinder is pushed down below the bottom surface of the unit body. As a result, the reaction force from the table acts on the unit body in response to the pushing down force of the rod of the lower cylinder, so that the unit body itself is lifted from the table groove and the rotating body is projected above the table surface. be able to. Therefore, by supporting the article on the table surface by the rotating body, the article can be easily moved and changed in direction.

On the contrary, when the supply of the pressure fluid is stopped and the piston of the upper cylinder rises, the working oil in the oil chamber is pushed up and the rod of the lower cylinder retreats into the bottom surface of the unit body, The unit body descends. Therefore, the rotating body can be moved backward into the article mounting surface of the article mounting table, and the article can be supported stationary on the table surface.

Here, since the diameters of the upper and lower cylinders are set to be larger than the diameter of the oil chamber, respectively, comparison is made by the difference in the pressure receiving area between the upper cylinder and the oil chamber and the difference in the pressure receiving area between the lower cylinder and the oil chamber. The lowering force of the lower cylinder can be increased with an extremely low fluid pressure. Therefore, it is possible to sufficiently deal with the transportation of heavy objects, and the versatility of the present device is significantly improved.

Moreover, since a high thrust force is obtained by using a pair of upper and lower cylinders, not only a much higher thrust force can be obtained than the pneumatic levitation type, but also a booster or the like used in the conventional fluid levitation type is unnecessary. In addition, it is possible to achieve a compact lifting device and a simplified structure.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be described based on. In FIG. 1, the unit elevating / lowering device 1 is such that a plurality of rotating bodies 3 are rotatably mounted on a unit main body 2 and a part of the rotating body 3 is projected from the upper surface of the main body 2 as in the conventional example.

The unit main body 2 is divided into an upper member 20 and a lower member 21 which are fixed to each other. A plurality of upper cylinders 30 are formed on the upper member 20 and an upper cylinder 30 is formed on the lower member 21. Individually corresponding lower cylinders 40 are formed.

First, the upper cylinder 30 is, for example, an air cylinder. In this upper cylinder 30, a piston 31 is slidably accommodated in a cylinder chamber 32 formed in the upper member 20, and a rod 33 is slidably inserted in an oil chamber 24 opened to the bottom surface 23 side of the upper member 20. Has been done. 18 is a sleeve through which the rod 33 slidably passes, 25 is a seal, and 26 is an O-ring.

The cylinder chamber 32 of the upper cylinder 30 is open to the atmosphere via an air passage (not shown). The back space 34 of the piston 31 communicates with an air supply / exhaust port 28 provided at one end of the upper member 20 via an air passage 27 formed inside the upper member 20. The air supply / exhaust port 28 is connected to a compressor (not shown). 29 is an O-ring and 19 is a bolt .

The air passage 27 communicates with the back space 34 of the right upper cylinder 30 via two bypass passages 50 and 51 as shown in FIG. 2 (plan view). Therefore,
When the compressed air from the air supply / exhaust port 28 is supplied from the air passage 27 to the rear space 34 of the right upper cylinder 30, at the same time, it also passes through the bypass passages 50 and 51 to the rear space of the right upper cylinder 30 at the same time. What is supplied. The number of upper cylinders 30 is not limited to two and may be three or more. 53 is a fastening screw.

Next, the lower cylinder 40 shown in FIG. 1 is, for example, a hydraulic cylinder. In this lower cylinder 40, a piston 41 is slidably accommodated in a cylinder chamber 42 formed in the lower member 21, and a rod 43 is slidable in an opening 44 opened to the bottom surface 23 ′ side of the lower member 21. Penetrates. The cylinder chamber 42 is open to the atmosphere via an air passage 29 (not shown). On the other hand, the rear space of the piston 41 faces the oil chamber 24 , and the oil chamber 24 is closed by the piston rod 31 of the upper cylinder 30 and the piston 41 of the lower cylinder 40.

Reference numeral 45 denotes a compression spring housed in the cylinder chamber 42, which is supported between the piston 41 and the spring receiving portion 46 of the lower member 21.

Reference numeral 47 is an adjusting screw screwed to the rod 43,
Functions as an oil filler and height adjuster. That is, by removing the adjusting screw 47 from the rod 43, oil can be injected into the oil chamber 24 through this screw hole.
Further, by projecting the adjusting screw 47 downward from the bottom surface 23 ′ of the lower member 21 by a predetermined amount, the projecting amount of the rod 43, that is, the upward displacement amount of the unit main body 2 can be arbitrarily adjusted.

Here, the pushing force of the lower cylinder 40 for raising the unit body 2 is W, the upper area of the piston 31 of the upper cylinder 30 is S ₀ , and the lower area of the rod 33 (= the cross-sectional area of the oil chamber 24). If S _{1 is} the area of the lower part of the piston 41 of the lower cylinder 40 is S ₂ , and the pressure of the compressed air applied to the upper cylinder 30 is P ₀ , the following first equation is established according to Pascal's law.

W = (S ₀ / S ₁ ) S ₂ · P ₀ (1)

The areas of S ₀ , S ₁ and S ₂ are adjusted and further set as in the following second equation.

S ₀ > S ₁ <S ₂ (2) As a result, according to the above law, it is possible to obtain a high pushing force that cannot be obtained in the above-mentioned conventional example with a relatively low air pressure.

In the above-mentioned embodiment, the table is the same as in the conventional example.
The rotary body 3 is mounted in the concave groove 14 of 13 and the rotary body 3 is projected and retracted on the support surface 15 thereof. The operation will be described below.

FIG. 1 shows pistons 31 and 4 of both cylinders 30 and 40.
When 1 is raised, transport unit 1
Is in the lowered position due to its own weight and the compression spring. At this time, the supporting surface 15 is located slightly above the rotating body 3 as shown in FIG. The object rests directly on this support surface 15.

Next, by switching the switching valve, the compressed air supplied from the compressor or the like is supplied from the air supply / exhaust port 28 of FIG. 1 to the air passage.
It is fed into the rear space 34 of the upper cylinder 30 via 27.
Since the cylinder chamber 32 of the upper cylinder 30 is always open to the atmosphere, the piston 31 is pushed down by the compressed air as shown in FIG. Therefore, the rod 33 is
The piston 41 of the lower cylinder 40 is pushed down against the spring force of the compression spring 45, and the rod 43 moves downward from the bottom surface 23 'of the lower member 21. Project.

As a result, the lower member 21 floats integrally with the upper member 20 by the connecting bolt 60, and as a result, the unit body 2 is
As shown in FIG. 3 (b), it is possible to lift the rotary body 3 from the groove 14 and project it above the table surface 15. Therefore, the article on the table surface 15 can be supported by the rotating body 3, and the article can be easily conveyed and turned.

On the contrary, the switching valve is switched to supply / exhaust port.
When 28 is released to the atmosphere, the rear side of the piston 31 of the upper cylinder 30 becomes normal pressure, so the piston 41 of the lower cylinder 40
Is lifted by the spring force of the compression spring 45, the hydraulic oil in the oil chamber 24 is pushed up, the rod 43 of the lower cylinder 40 retracts into the bottom surface 23 'of the unit body 2, and the unit body 2 is again moved to the position shown in FIG. Lower to position (a). Therefore, the table surface 15 can support the article in a stationary state.

The present invention has the following effects due to the above configuration and operation.

That is, since the diameters of the upper and lower cylinders 30 and 40 are set to be larger than the diameter of the oil chamber 24, respectively, the difference between the pressure receiving areas of the upper cylinder 30 and the oil chamber 24, and the lower cylinder 40 and the oil chamber 24. Due to the difference in the pressure receiving area of 24, the pushing-down force of the lower cylinder 40 can be increased with a relatively low fluid pressure. Therefore, it is possible to sufficiently deal with the transportation of heavy objects, and the versatility of the present device is significantly improved.

Furthermore, since it is possible in a pair of upper and lower cylinder obtain high thrust, not only to obtain a much higher thrust than pneumatic floating type, the booster (pressure booster) used in traditional fluid flotation above equation also As a result, it becomes unnecessary and the exclusive space is reduced, so that the lifting device can be made compact and the structure can be simplified.

Further, in this embodiment, the adjusting screw 47 is provided on the rod 43 of the lower cylinder 40 so that the adjusting amount of the protruding amount of the rod 43 can be adjusted not only for oil injection but also for adjusting the adjusting screw 47. The mutual height positions of the table surface 15 and the rotating body 3 can be easily adjusted simply by operating. Therefore, there is an advantage that the practical value is increased and the business efficiency is improved.

In the embodiment and operation of the present invention, the carrying unit has been described, but it is needless to say that an object is clamped by using a clamp means instead of the rotating body 3.

[0038]

As described above, in the lifting device for a unit according to the present invention, the diameters of the upper and lower cylinders are set to be larger than the diameter of the oil chamber, respectively. Thereby, the pushing-down force of the lower cylinder can be increased. Therefore, a high thrust can be obtained, and it is possible to sufficiently deal with the transportation of heavy objects. Further, since the upper and lower cylinders are configured to obtain a high thrust force, the conventional pressure boosting device is not required. As a result, a lifting device having a compact and simple structure can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of the same lifting device.

FIG. 3 is an explanatory view of a usage state of the above apparatus.

FIG. 4 is a schematic perspective view of the same apparatus.

FIG. 5 is a vertical cross-sectional view showing an operating state of the same device.

FIG. 6 is a vertical sectional view of a conventional example.

FIG. 7 is a perspective view of a conventional example.

FIG. 8 is an explanatory view of a usage state of a conventional device.

FIG. 9 is a vertical cross-sectional view of another conventional example.

[Explanation of symbols]

 2 unit body 3 rotating body 13 table 24 oil chamber 30 upper cylinder 31 upper cylinder piston 33 upper cylinder rod 40 lower cylinder 41 lower cylinder piston 43 lower cylinder rod

Claims (1)

[Scope of utility model registration request] 1. A unit main body on which a plurality of rotating bodies are mounted is arranged in a concave groove of an article mounting table, and the rotating body is projected above the article mounting surface of the table to provide an article on the table surface. In the lifting device for the unit, which is configured to be carried on the rotating body, an oil chamber is provided in the unit main body,
The upper and lower cylinders having a diameter larger than that of the oil chamber are arranged above and below the oil chamber, and the rod of the upper cylinder and the piston of the lower cylinder face each other facing the oil chamber. An elevating device for a unit, characterized in that the rear space is communicated with a pressure fluid supply source, and the tip of the rod of the lower cylinder is arranged so as to project from the bottom surface of the unit body toward the concave groove of the table.