KR100757025B1 - Work conveyance device - Google Patents

Abstract

An object of this invention is to provide the workpiece conveyance apparatus which can stabilize the fluctuation | variation of the suction pressure in a workpiece storage opening, even if the workpiece loading rate to a workpiece storage groove | channel changes.

The workpiece conveyance apparatus is provided with the table base 2 and the conveyance table 3 arrange | positioned rotatably on the table base 2, and the some workpiece storage groove 4 provided in the circumferential edge. The annular negative pressure groove 9 is provided in the surface of the table base 2 at the side of the conveyance table 3, and the suction groove 5 is provided in the surface of the table base 2 side of the conveyance table 3. It is. The table base 2 is provided with an annular atmospheric groove 11 communicating with the suction groove 5 and a first atmospheric introduction hole communicating with the atmospheric side.

Work piece, work conveying device, atmosphere introduction hole, T-joint

Description

WORK CONVEYANCE DEVICE}

1 is a configuration diagram showing an embodiment of a workpiece transport apparatus according to the present invention.

FIG. 2 is a partial cross-sectional view of the workpiece conveyance apparatus shown in FIG. 1. FIG.

3 is a partial cross-sectional view showing a modification of the work conveying apparatus according to the present invention.

4 is a partial cross-sectional view showing another modified example of the workpiece transport apparatus according to the present invention.

5 is a partial cross-sectional view showing a conventional work conveying device.

Fig. 6 is a diagram showing an example of suction pressure with respect to work loading rate.

※ Explanation of code about main part of drawing ※

1: work conveying device

2: table base

3: bounce table

4: work storage groove

5: suction groove

6: workpiece supply

7: measuring unit

8: outlet

8a: exhaust hole

9: annular negative pressure groove

10: suction communication hole

11: annular atmospheric groove

12: first atmospheric inlet hole

13: second atmospheric introduction hole

14: vacuum tubing

14a: vacuum generating source

15: T-joint

16: flow adjustment means

17: Atmosphere Introduction

w: walk

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a work conveying apparatus for sucking and holding a workpiece in a plurality of workpiece storage grooves provided in the conveying table, and in particular, suction in the workpiece storage groove even when the loading factor of the workpiece into the workpiece storage groove varies. It is related with the workpiece conveyance apparatus which can stabilize a pressure.

Background Art As a work conveying device which conveys a workpiece (electronic component) while suctioning, it is known that it is shown in JP-A-54-126719, JP-A-58-16971, JP-A-8-136463, and the like. have. These workpiece | work conveying apparatus attracts and conveys several workpiece | work simultaneously.

As described above, in the apparatus for simultaneously sucking a plurality of workpieces, the number of objects to be sucked increases further, for example, with a work sorter, in accordance with the recent increase in precision of the workpieces. In addition, the workpiece | work is measured during the conveyance of a workpiece | work, and many workpiece | work is discharged | emitted in a predetermined location based on the result. Therefore, the fluctuation | variation of the suction pressure of a workpiece conveyance apparatus may become large. Hereinafter, the variation of the suction pressure will be described in detail.

FIG. 5 is a partial cross-sectional view showing a conventional work conveying device, and FIG. 6 shows a variation in suction pressure with respect to the work loading rate when the work is loaded into the work receiving groove of the work conveying device of FIG. 5.

As shown in FIG. 5, the workpiece conveyance apparatus is provided with the table base 2 and the conveyance table 3 rotatably provided on the table base 2, and the several workpiece storage groove 4 provided in the circumferential edge. Doing. The table base 2 is provided with an annular negative pressure groove 9 which communicates with the vacuum generating source 14a via the vacuum pipe 14, and the workpiece storage groove 3 is provided on the conveyance table 3. A suction groove 5 communicating with 4) and the annular negative pressure groove 9 is provided.

As shown in FIG. 5, the annular negative pressure groove 9 is cut into the table base 2, and the annular negative pressure groove 9 is a vacuum generating source that is a negative pressure suction means through a plurality of suction communication holes 10. It is connected to the vacuum piping 14 which communicates with 14a.

The suction pressure p in the annular negative pressure groove 9 in the workpiece conveyance apparatus shown in FIG. 5 is demonstrated by FIG. FIG. 6 shows a state in which the workpiece w is loaded in all the work storage grooves 4 from the state in which the workpiece w is not loaded at all in the work storage groove 4 (loading rate of 0%) (loading ratio of 100%). An example of the suction pressure p in the annular negative pressure groove 9 corresponding to FIG.

When the suction pressure is set to the lowest suction pressure P ₁ at which suction of the workpiece w is possible while the workpiece w is not loaded in the workpiece storage groove 4 at all, the empty workpiece is stored by the loading of the workpiece w. When the groove 4 decreases, the suction pressure P rises rapidly.

Next, when the workpiece w is loaded in all the work storage grooves 4, the suction pressure reaches the maximum negative pressure P ₂ set by the supply capacity of the vacuum generating source 14a serving as the negative pressure supply means or the negative pressure regulator, and the minimum negative pressure A pressure fluctuation in which the difference between P ₁ and the maximum negative pressure P ₂ is multiplied, for example, occurs.

As described above, when the work load ratio increases and the negative pressure increases rapidly, the suction force of the workpiece w increases in the workpiece storage groove 4, thereby ensuring that the workpiece w in the workpiece storage groove 4 is discharged. Can not be discharged.

On the other hand, in the discharge portion, the top portion pressure P ₂ in so that the work (w) in the workpiece accommodating groove 4 can be sufficiently discharged, for example, setting the exhaust air pressure for ejecting toward the workpiece as the external force, the lowest portion In the vicinity of the pressure P ₁ , the discharge pressure may be too strong in the workpiece accommodating groove 4 as compared with the suction force of the workpiece w, and the workpiece may be suddenly scattered to damage the workpiece w. Moreover, the suction force of the clearance gap between the conveyance table 3 and the table base 2 changes with the fluctuation of the suction pressure in the annular negative pressure groove 9, and the friction between the conveyance table 3 and the table base 2 is carried out. This may occur or increase, and rotation of the conveyance table 3 may become unstable.

The present invention has been made in view of this point, and even when the work is loaded and discharged, the variation in suction pressure in the work storage groove can be reduced, thereby sucking the work in the work storage groove with a stable suction pressure to load the work. It is an object of the present invention to provide a work conveying apparatus capable of holding and conveying the work in the work storage groove and stably discharging it from the work storage groove.

The present invention includes a table base and a conveying table rotatably disposed on the table base and provided with a plurality of work receiving grooves at the circumferential edge thereof, and communicating with a vacuum generating source through a vacuum pipe on a surface proximate to the conveying table of the table base. The annular negative pressure groove to be provided is provided, and the suction groove which communicates each workpiece storage groove and the annular negative pressure groove is provided in the surface which adjoins to the table base of a conveyance table, and the atmospheric air supply means connected to an atmospheric side is provided to the suction groove. It is a work conveying apparatus characterized by the above-mentioned.

The air supply means is a work conveying apparatus which is provided in the table base and has an annular atmospheric groove communicating with the suction groove, and a first atmospheric introduction hole communicating with the annular atmospheric groove and the atmospheric side. .

This invention is a workpiece conveyance apparatus provided with the atmospheric air supply means provided in the conveyance table, and has a 2nd atmospheric introduction hole which communicates a suction groove and an atmospheric side.

This invention is a work conveying apparatus characterized by the atmospheric air supply means having an atmospheric inlet pipe connected to the vacuum piping and connected to the atmospheric side.

This invention is the workpiece conveyance apparatus provided with the flow volume adjusting means in the atmospheric inlet pipe.

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described with reference to drawings.

1 and 2 are diagrams showing one embodiment of a workpiece transport apparatus according to the present invention.

As shown in FIG. 1 and FIG. 2, the work conveying apparatus 1 is installed on the table base 2 and the table base 2 so as to be rotatable in close proximity with each other, and has a plurality of workpieces on the circumferential edge thereof. The conveyance table 3 provided with the storage groove 4 is provided.

Moreover, the annular negative pressure groove 9 is provided in the surface which adjoins the conveyance table 3 of the table base 2. The annular negative pressure groove 9 communicates with a plurality of suction communication holes 10 provided in the table base 2, and each suction communication hole 10 communicates with the vacuum generating source 14a through the vacuum pipe 14. It is. Moreover, the suction groove 5 which communicates each workpiece storage groove 4 and the annular negative pressure groove 9 is provided in the surface which adjoins the table base 2 of the conveyance table 3, and this suction groove ( 5) the inside of the work receiving groove 4 is maintained at a negative pressure.

The suction groove 5 extends radially from the workpiece storage groove 4 of the conveying table 3 toward the center to communicate with the annular negative pressure groove 9, and then further extends inward. The inner end of the suction groove 5 communicates with the annular atmospheric groove 11 provided in the table base 2. The annular atmospheric groove 11 communicates with the atmospheric side via a plurality of first atmospheric introduction holes 12 passing through the table base 2.

In addition, the atmospheric air intake means is constituted by the annular atmospheric groove 11 and the first atmospheric introduction hole 12.

As shown in FIG. 1, the workpiece | work w supplied to the workpiece storage groove 4 from the workpiece supply part 6 by the workpiece supply means 6a is hold | maintained and suctioned in the workpiece storage groove 4, and the conveyance table 3 is carried out. In the process of rotation conveyance by), the electrical characteristic is measured in the measuring unit (7). Thereafter, the workpiece w in the work receiving groove 4 is discharged outward from the discharge hole 8a according to the electrical characteristics in the discharge portion 8.

As described above, the plurality of work receiving grooves 4 provided in the conveying table 3 communicate with the annular negative pressure groove 9 serving as the negative pressure supply means through the suction groove 5, respectively, and further, the suction groove 5. Is communicated with the annular atmospheric groove 11 which is air supply means. As shown in FIG. 2, the annular negative pressure groove 9 and the annular atmospheric groove 11 are formed in the table base 2, and are formed in a concentric circle which is concentric with the circular conveyance table 3. It consists of an annular groove.

Among these, the annular negative pressure groove 9 is connected to the vacuum generating source 14a via a vacuum pipe 14 screwed into a plurality of suction communication holes 10 provided through the table base 2, and the atmospheric intake air. The annular atmospheric groove 11, which is a means, is opened to the atmosphere by a plurality of first atmospheric introduction holes 12 provided through the table base 2.

Moreover, the suction groove 5 consists of the groove | channel of the micro cross section cut in every work storage groove 4 in the lower surface which opposes the table base 2 of the conveyance table 3, and the workpiece storage groove 4 Extending radially from the ring toward the annular negative pressure groove 9 and the annular atmospheric groove 11.

Next, the operation of the present embodiment having such a configuration will be described. In FIG. 1, the workpiece | work w supplied from the workpiece supply means 6a to the workpiece supply part 6 is sequentially loaded in the workpiece storage groove 4 of the conveyance table 3, and in the workpiece storage groove 4 The suction is maintained by the negative pressure of the suction groove 5 in communication with the annular negative pressure groove 9. Then, the workpiece | work w in the workpiece storage groove 4 is conveyed according to the rotation (arrow direction) of the conveyance table 3.

Thereafter, electrical measurement is performed on the workpiece w in the workpiece accommodating groove 4 in the measuring unit 7, and the workpiece w in the workpiece accommodating groove 4 is discharged based on the measurement result. Is discharged outward from the discharge hole 8a.

Next, the pressure fluctuations in the workpiece storage groove 4 therebetween will be described. In the state where the workpiece w is not loaded into the workpiece storage groove 4 of the conveyance table 3, the outer end of the suction groove 5 is open to the atmosphere in the workpiece storage groove 4, and the inner end thereof has a loop. It communicates with the shape atmospheric groove 11, and is substantially open | released. As shown in FIG. 2, the annular negative pressure groove 9 is located between the outer open end and the inner end of the suction groove 5, and the vacuum pipe 14 is screwed into the suction communication hole 10. The air in the annular negative pressure groove 9 is sucked through and to make the negative pressure. At this time, the air pressure inside the annular atmospheric groove 11 open to the atmosphere through the plurality of first atmospheric introduction holes 12 is slightly lower than the atmospheric pressure of the work receiving groove 4. In addition, with respect to the workpiece storage groove 4 which is linearly opened to the air by the suction groove 5, the intake direction on the annular atmospheric groove 11 side becomes a direction perpendicular to the suction groove 5, and 1 Since the air inlet 12 has a smaller number than the suction groove 5 and does not have a large cross-sectional area, the ventilation resistance at the annular atmospheric groove 11 side is larger than the ventilation resistance at the work storage groove 4 side. Will grow. For this reason, air | atmosphere is inhaled mainly in the annular negative pressure groove 9 from the workpiece storage groove 4 side, and the workpiece | work w becomes easy to be attracted to the workpiece storage groove 4.

When the workpiece w is sucked and held in the workpiece storage groove 4 of the conveying table 3, the outer end of the suction groove 5 on the side of the workpiece storage groove 4 is closed to stop the inflow of air, but the annular atmospheric groove Since intake from the (11) side is performed, an increase in the degree of vacuum is suppressed, and the negative pressure in the annular negative pressure groove 9 is maintained at a state where the degree of vacuum is slightly higher than that before the workpiece w is sucked and held. . Therefore, regardless of the work loading rate to the plurality of workpiece storage grooves 4, the suction pressure into the workpiece storage grooves 4 can be set within a range which sufficiently stabilizes the pressure in the workpiece storage grooves 4 as compared with the state without the atmospheric introduction holes 12. have.

Furthermore, by providing the annular atmospheric groove 11 and introducing the atmosphere from the first atmospheric introduction hole 12, the work is introduced by the atmosphere by the introduction atmosphere as compared with the case where the atmosphere is directly introduced into the annular negative pressure groove 9. The negative pressure plate can be prevented from occurring. Moreover, by providing a baffle plate, the atmospheric introduction hole can also be provided in the annular negative pressure groove 9 directly.

Next, the modification of this invention is demonstrated with reference to FIG. In FIG. 1 and FIG. 2, although the annular atmospheric groove 11 and the suction groove 5 were cut off and installed in the table base 2, as shown in FIG. In the substantially intermediate position of the annular negative pressure groove 9, a second atmospheric introduction hole 13 having a small cross section communicating with the suction groove 5 from the upper surface of the conveying table 3 toward the lower surface side is provided. .

In the modification shown in FIG. 3, the same code | symbol is added to the same part as the Example shown in FIG. 1 and FIG. 2, and detailed description is abbreviate | omitted.

In FIG. 3, when the workpiece w is loaded into the workpiece storage groove 4, the atmosphere is taken in from the second atmospheric introduction hole 13 in the suction groove 5 closed with suction holding. Thereby, the negative pressure in the annular negative pressure groove 9 can be stabilized. In FIG. 3, although the 2nd air | atmosphere introduction hole 13 is formed perpendicular to the conveyance table 3, the upper surface side has the 2nd air | atmosphere introduction hole 13 to the rotation center direction of the conveyance table 3 with respect to the lower surface side. It may also be installed to be inclined to face.

Next, with reference to FIG. 4, the other modified example of this invention is demonstrated. In each of the above-described embodiments, an example in which the first and second air inlet holes 12 and 13 are provided to intake air into each of the work accommodating grooves 4 is shown. However, as shown in FIG. The air inlet pipe 17 connected to the air side via the T-joint 15 is connected to 14).

In the modification shown in FIG. 4, the same code | symbol is added to the same part as the Example shown in FIG. 1 and FIG. 2, and detailed description is abbreviate | omitted.

In FIG. 4, the suction communication hole 10 which penetrated the table base 2 is provided, and the vacuum piping 14 is screwed to this suction communication hole 10. As shown in FIG. A T-joint 15 having a straight joint side as a negative pressure passage is inserted between the vacuum pipe 14 and the vacuum generating source 14a, and an atmospheric inlet pipe 17 is connected to the branch joint side of the T-joint 15. It is. The atmospheric inlet pipe 17 is opened to the atmosphere through the flow rate adjusting means 16.

In FIG. 4, when the workpiece w is loaded into the work receiving groove 4, the intake air amount from the atmospheric communication hole 10 into the vacuum pipe 14 decreases, and the negative pressure of the annular negative pressure groove 9 is about to fluctuate. In this case, the part whose air intake from the atmospheric communication hole 10 side was reduced can be supplied to the vacuum piping 14 from the atmospheric inlet pipe 17 through the flow adjusting means 16, and the annular negative pressure groove 9 Fluctuations in the internal negative pressure can be suppressed.

 As shown in FIG. 4, the suction pressure in the annular negative pressure groove 9 can be stabilized without using an expensive pressure control device or the like only by inserting the atmospheric inlet pipe 17 into the vacuum pipe 14. It is a simple and inexpensive device. In addition, in FIG. 4, since the air supply amount from the flow rate adjusting means 16 side becomes a comparatively large amount, it is preferable that the vacuum generating source 14a has sufficient supply capacity.

In addition, the T-joint 15 is an example of the branching means, and if the ventilation resistance at the vacuum pipe 14 side is small and the ventilation resistance at the atmospheric inlet pipe 17 side can be increased, the T-joint 15 is Other branching means may be used.

As mentioned above, according to this invention, the fluctuation | variation of the suction pressure in the workpiece storage groove accompanying loading and discharging of a workpiece can be stabilized small. For this reason, a workpiece | work can be sucked and loaded in a workpiece | work accommodation groove by stable suction force, it can hold | maintain and convey a workpiece | work in this workpiece storage groove | channel, and can discharge a workpiece | work stably from the workpiece storage groove | channel.

Claims (5)

With table base, A conveying table rotatably disposed on the table base and provided with a plurality of work receiving grooves at a peripheral edge thereof, An annular negative pressure groove communicating with a vacuum generating source is provided on a surface proximate to the conveying table of the table base via a vacuum pipe, A suction groove communicating with each of the workpiece storage grooves and the annular negative pressure groove is provided on a surface proximate to the table base of the conveying table, In the suction groove, an atmospheric air supply means communicating with the atmospheric side is provided, And the air supply means is connected to a vacuum pipe and has an air inlet pipe connected to the air side. delete delete delete The method of claim 1, A work conveying apparatus, wherein a flow rate adjusting means is provided in the air inlet pipe.

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