JP2003012147A - Pressurized air inflow device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate large vacuum suction force at the other opening end in a pressurized air inflow device attached on an intermediate part of a part transfer duct and making the pressurized air inflow from the outside to one opening end of the duct. SOLUTION: This pressurized air inflow device 28 is attached on the intermediate part of the duct 26. The pressurized air from the outside is made to flow through one opening end (right direction) into the duct 26. Three air injection holes 36c for making the pressurized air flow into the duct 26 are formed near an inner peripheral surface of the duct 26 at intervals of 120 deg. along the peripheral direction. The respective air injection holes 36c are set to be inclined in an angle of 30 deg. along the peripheral direction with respect to an axis Ax direction of the duct 26. The pressurized air is made to flow into the duct 26 with the injection angle. Thus, the pressurized air is made to flow spirally around the axis Ax in the duct 26 so as to form a spiral air current stably, and the large vacuum suction force is generated at the other opening end (upstream side opening end).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on an intermediate portion of a duct for transporting components, and allows pressurized air from the outside to flow into the duct toward one opening end of the duct. It relates to the device.

[0002]

2. Description of the Related Art In a duct for carrying small screws, small electronic components and the like by air, it is necessary to generate an air flow in the duct.
Conventionally, a pressurized air inflow device as described in JP-A-0-53248 has been known. This pressurized air inflow device is mounted in the middle of the duct, and is configured to allow the pressurized air from the outside to flow into the duct toward one of the opening ends thereof, and thereby the other opening end thereof. A negative pressure suction force is generated in the duct to generate an air flow in the duct from the other open end (upstream side open end) to the one open end (downstream side open end).

In such a pressurized air inflow device,
An air injection hole for allowing the pressurized air to flow into the duct is formed near the inner peripheral surface of the duct. Specific configurations of the air injection holes include an air injection hole 104 formed in an annular shape along the vicinity of the inner peripheral surface of the duct 102 as shown in FIG. 5 and a duct 102 as shown in FIG. It is known that a plurality of air injection holes 106 are formed at predetermined intervals in the circumferential direction along the vicinity of the inner peripheral surface.

[0004]

However, the pressurized air inflow device having such air injection holes has the following problems.

That is, the air injection hole 104 shown in FIG.
Is formed in an annular shape, the air injection hole 10
The pressurized air flowing in from No. 4 merely flows in a straight line along the axial direction of the duct 102, and a reverse flow is likely to occur on the inner peripheral side thereof, so that a large negative pressure suction force is generated at the upstream opening end. There is a problem that it cannot be done. On the other hand, since the plurality of air injection holes 106 shown in FIG. 6 are all formed within the cross section including the axis of the duct 102,
The pressurized air that has flowed in from these air injection holes 106 also merely flows linearly along the axial direction of the duct 102, and since a reverse flow is likely to occur on the inner peripheral side thereof, a large negative pressure is applied to the upstream opening end. There is a problem that the suction force cannot be generated.

The present invention has been made in view of the above circumstances, and is mounted in the middle part of a duct for transporting parts, and pressurized air from the outside is introduced into the duct to open one side of the duct. It is an object of the present invention to provide a pressurized air inflow device capable of generating a large negative pressure suction force at the other open end of the pressurized air inflow device that flows toward the end.

[0007]

The present invention is to achieve the above object by devising the direction of the air injection hole.

That is, the pressurized air inflow device according to the present invention is installed in the middle of a duct for carrying parts, and the pressurized air from the outside flows into the duct toward one opening end of the duct. In the pressurized air inflow device,
At least one air injection hole for allowing the pressurized air to flow into the duct is formed in the vicinity of the inner peripheral surface of the duct, and the direction of each of these air injection holes is relative to the axial direction of the duct. Is set in a direction inclined by a predetermined angle in the circumferential direction.

The above-mentioned "duct" is not particularly limited in its specific configuration such as its cross-sectional shape and material as long as it can transport parts in the duct. Also, regarding the components transported in the “duct”, the specific configuration such as type, shape, size, weight, etc. is not particularly limited.

The above-mentioned "pressurized air" may be normal pressurized air, but may be pressurized gas such as pressurized nitrogen gas.

The number of the "air injection holes" to be formed, the cross-sectional shape, etc. are particularly limited as long as the direction is set to be inclined in the circumferential direction by a predetermined angle with respect to the axial direction of the duct. Not a thing. Also, this "air injection hole"
With respect to the radial direction of the duct, the direction may be set to extend in the axial direction of the duct, or may be set to be inclined with respect to the axial direction of the duct. .

The specific value of the "predetermined angle" is not particularly limited and can be set, for example, in the range of 5 to 60 °, preferably in the range of 10 to 50 °. Preferably, it can be set to about 20 to 40 °. Further, when a plurality of air injection holes are formed, the inclination angles of the air injection holes may be the same value or different values.

[0013]

As described above, the pressurized air inflow device according to the present invention is mounted in the middle of a duct for carrying parts, and the pressurized air from the outside is introduced into the duct. Although it is configured to flow toward one open end, at least one air injection hole for allowing pressurized air to flow into the duct is formed near the inner peripheral surface of the duct. Since the direction of the injection hole is set to be inclined in the circumferential direction by a predetermined angle with respect to the axial direction of the duct, the following operational effects can be obtained.

That is, since pressurized air flows into the duct from each air ejection hole at an injection angle that is inclined in the circumferential direction by a predetermined angle with respect to the axial direction, the pressurized air spirals in the duct around its axis. Flow in a circular pattern, thereby forming a spiral air flow. This swirl-like airflow is a stable flow with less reversal flow compared to the airflow that linearly flows along the axial direction of the duct as in the conventional case, so that it is large at the other opening end (upstream side opening end). A negative pressure suction force can be generated.

As described above, according to the present invention, the pressurized air which is mounted in the middle of the duct for carrying the parts and which allows the pressurized air from the outside to flow into the duct toward one opening end of the duct. In the inflow device, a large negative pressure suction force can be generated at the other open end. As a result, it becomes possible to carry relatively heavy parts and the like that could not be conventionally carried. Also,
If the parts to be transferred are the same as the parts that were previously transferred,
The required supply pressure of the pressurized air can be reduced.

Moreover, in the pressurized air inflow device according to the present invention, since the spiral airflow is formed on the downstream side of each air injection hole in the duct, the components also ride on the spiral airflow to form the duct. It is conveyed as if rolling on the inner peripheral surface. Therefore, compared to the case where the component is linearly transported along the axial direction of the duct, the transport speed of the component can be significantly reduced. Thus, it is possible to prevent the component from jumping out vigorously from one opening end (downstream opening end) of the duct.

In the above structure, if a plurality of air injection holes are formed at substantially equal intervals in the circumferential direction and the inclination angles of these air injection holes are set to substantially the same value with respect to the duct axis, the pressurized air Can be made to flow in a spiral with multiple threads,
As a result, the spiral airflow can be formed more strongly.

The use of the "duct" is not particularly limited, but in the case of a duct arranged so as to extend from the vicinity of the rolling completion position to the vicinity of the recovery container in the thread rolling device, Screws will be conveyed by the duct. At this time, by adopting the configuration of the present invention, even a relatively large screw can be easily transported.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing a thread rolling device incorporating a pressurized air inflow device 28 according to an embodiment of the present invention.

Before describing the structure of the pressurized air inflow device 28, the overall structure of the thread rolling device will be described.

As shown in the figure, this thread rolling device comprises a rolling mechanism 12, a screw material supply mechanism 14, and a recovery device 20.

The rolling mechanism 12 is a flat-die type rolling mechanism having a fixed die plate 16 and a moving die plate 18, and the screws supplied to the rolling start position A by the screw material supplying mechanism 14. Material 2 (Shaft diameter 0.5 mm
A small part having a head thickness of about 0.3 mm) is sandwiched between the rolling surface 16a of the fixed die plate 16 and the rolling surface 18a of the moving die plate 18, and the moving die is moved along the fixed die plate 16. By moving the plate 18,
It is configured to roll a thread on the shaft portion of the screw material 2. The fixed die plate 16 and the movable die plate 18 are arranged so as to be inclined slightly downward with respect to the direction from the rolling start position A to the rolling completion position B. The screw material 2 (that is, the screw 4) that has been rolled by the rolling mechanism 12 jumps out from the rolling completion position B and is then collected by the collecting device 20.

Originally, the rolled screw 4 protrudes from the rolling completion position B in a direction substantially the same as the moving direction of the moving die plate 18, but the rolling oil or the sticking oil adhered to both die plates 16 and 18 Since the screw 4 may not stick out from the rolling completion position B due to dirt or the like and may return to the original position while being attached to both die plates 16 and 18, in order to prevent this in advance, An air nozzle 22 that blows air toward the vicinity of the rolling completion position B is provided above the mechanism 12.

The recovery device 20 is arranged so as to extend from the vicinity of the rolling completion position B to the vicinity of the upper part of the recovery container 24 and a recovery container 24 arranged outside a device housing (not shown) in the thread rolling device. The duct 26 is provided with the compressed air inflow device 28 mounted in the middle of the duct 26.

The pressurized air inflow device 28 according to this embodiment.
Applies pressurized air from the outside into the duct 26.
By flowing toward the recovery container side opening end 26b (one opening end) from the rolling completion position side opening end 26a (the other opening end) of the duct 26 into the collection container side opening end 26b. It is designed to generate an air flow that flows toward (to be described later).

The duct 26 includes a suction nozzle 30, a pipe 32 connected to the suction nozzle 30, and the pipe 3.
2 and a tube 34 connected via a pressurized air inflow device 28.

FIG. 2 is a plan view showing the duct 26 and the pressurized air inflow device 28 in detail.

As shown, the pressurized air inflow device 28 is
The upstream side member 36 and the downstream side member 38 are connected, and the pressurized air hose 40 is connected to the downstream side member 38 by a connecting tool 42.
Are connected via.

An airflow passage 36a is formed in the upstream member 36, and an airflow passage 38a, which is concentric with the airflow passage 36a and slightly larger in diameter than the airflow passage 36a, is formed in the downstream member 38. Further, a pipe insertion hole having a diameter slightly larger than that of the airflow passage 36a is formed at the upstream end of the upstream member 36, and the pipe 32 is inserted in the pipe insertion hole at the upstream end. The member 36 and the pipe 32 are fixed with a bolt 44. The airflow passage 32a of the pipe 32 has the same diameter as the airflow passage 36a. On the other hand, a tube mounting sleeve 38b is formed on the downstream end of the downstream member 38, and the upstream end of the tube 34 is mounted on the tube mounting sleeve 38b.

The upstream side member 36 and the downstream side member 38 are connected by screwing, and an annular air chamber 46 surrounding the airflow passage 36a is formed at the connecting portion. Then, in the downstream member 38, the annular air chamber 46 and the pressurized air inflow passage 42 a of the connecting tool 42 are provided.
A communication hole 38c is formed to communicate with and. Also,
An annular flange portion 36b is formed at the downstream end of the upstream member 36, and an air injection hole 36c that connects the annular air chamber 46 and the airflow passage 38a is formed in the annular flange portion 36b. It is formed at three places at intervals of ° (this will be described later).

In the pressurized air inflow device 28, the pressurized air supplied from the outside via the pressurized air hose 40 once flows into the annular air chamber 46, and then the air is ejected from the annular air chamber 46. By injecting the pressurized air into the airflow passage 38a through the hole 36c, a strong airflow is generated in the duct 26 in a region downstream of the pressurized air inflow device 28 toward the recovery container side opening end 26b. It is like this. As a result, the area of the duct 26 upstream of the pressurized air inflow device 28 is set to a negative pressure, and the air around the rolling completion position side opening end 26a is moved to the duct 2.
6, so that an airflow flowing from the rolling completion position side opening end 26a toward the collection container side opening end 26b is generated in the duct 26 as described above.

The suction nozzle 30 constitutes a portion of the duct 26 near the open end 26a on the rolling completion position side.
The airflow passage 30a is formed in a funnel shape. A pipe insertion hole is formed at the downstream end of the suction nozzle 30, and the suction nozzle 30 and the pipe 32 are fixed by a bolt 48 with the upstream end of the pipe 32 inserted in the pipe insertion hole. It has become so.

FIG. 3 is a sectional view taken along line III-III in FIG. 2 showing the construction of the pressurized air inflow device 28 and its peripheral portions in detail, and FIG. 4 is a perspective sectional view showing the main part of FIG. (A) And the b direction arrow sectional view (b).

As shown in these figures, the upstream member 36
The downstream end surface 36b2 of the annular flange portion 36b is formed as a plane orthogonal to the axis Ax of the duct 26, and the upstream end surface 36b1 of the annular flange portion 36b has a cone with the axis Ax of the duct 26 as a central axis and an apex on the upstream side. It is formed as a surface.

As described above, the three air injection holes 36c formed in the annular flange portion 36b are provided with 120 in the circumferential direction.
The air injection holes 36c are formed at intervals of °.
Are formed so as to penetrate between the upstream end surface 36b1 and the downstream end surface 36b2 of the annular flange portion 36b. At this time, each air injection hole 36c is formed so as to extend linearly in a positional relationship of being twisted with the axis line Ax of the duct 26.

That is, the upstream side opening 36c1 of each air injection hole 36c is formed at a position displaced radially outward and clockwise with respect to the downstream side opening 36c2. Specifically, the circumferential deflection angles of the air injection holes 36c with respect to the axis Ax are both set to about 30 °, and the radial deflection angles of the air injection holes 36c with respect to the axis Ax are both set. It is set to about 20 °.

Then, the pressurized air is jetted toward the airflow passage 38a from each of the three air ejection holes 36c arranged in this way, whereby the pressurized air is delivered to the airflow passage 38a.
The spiral airflow is formed by three threads, and a spiral airflow as shown in FIG. 3 is formed in three phases in the airflow passage 38a. As a result, the screw 4 carried from the upstream airflow passage 36a to the airflow passage 38a rides on the spiral airflow and the tube mounting sleeve 38 in the airflow passage 38a.
The inner peripheral surface of b and the inner peripheral surface of the tube 34 are rolled and conveyed.

As described in detail above, the pressurized air inflow device 28 according to the present embodiment is mounted in the middle of the duct 26 of the recovery device 20 in the thread rolling device, and the inside of the duct 26 from the outside. The air injection hole 3 for allowing the pressurized air to flow into the duct 26 is configured so as to flow toward the recovery container side opening end 26b.
Three ducts 6c are formed in the vicinity of the inner peripheral surface of the duct 26 at intervals of 120 ° in the circumferential direction, and the directions of the respective air injection holes 36c are inclined in the circumferential direction of 30 ° with respect to the axis Ax direction of the duct 26. Since the orientation is set to the desired direction, the following operational effects can be obtained.

That is, since the pressurized air flows into the duct 26 from each of the air ejection holes 36c at an injection angle inclined by 30 ° in the circumferential direction with respect to the axis Ax direction, the pressurized air flows in the duct 26. It flows spirally around the axis Ax, thereby forming a spiral airflow. This spiral airflow is a stable flow with less reversal flow as compared with the airflow that linearly flows along the axis Ax direction of the duct 26 as in the related art, and therefore is large at the rolling end side opening end 26a. A negative pressure suction force can be generated. Moreover, since the three air injection holes 36c are formed at intervals of 120 ° in the circumferential direction, the pressurized air can be made to flow in a spiral shape with three threads, and thereby a spiral airflow can be formed more strongly. it can.

As described above, by mounting the pressurized air inflow device 28 according to the present embodiment on the intermediate portion of the duct 26 of the recovery device 20 in the thread rolling device, a large negative force is applied to the opening end 26a on the rolling completion position side. A pressure suction force can be generated. As a result, it is possible to carry a screw having a relatively large weight that could not be carried conventionally. Further, if the screw to be conveyed is the same as the screw that has been conventionally conveyed, the required supply pressure of the pressurized air can be reduced.

Further, in the pressurized air inflow device 28 according to the present embodiment, since the spiral airflow is formed on the downstream side of the air injection holes 36c in the duct 26, the screw 4 also has the spiral airflow. It will be conveyed by rolling on the inner peripheral surface of the duct 26. Therefore, as compared with the case where the screw 4 is linearly conveyed along the axial direction of the duct 26, the conveying speed of the screw 4 can be significantly reduced. Thus, it is possible to prevent the screw 4 from rushing out of the recovery container side opening end 26b of the duct 26.

In this embodiment, the case where the three air injection holes 36c are formed at intervals of 120 ° in the circumferential direction has been described, but it is of course possible to form the air injection holes 36c at other numbers and angular intervals.

In this embodiment, the circumferential deflection angle of each air injection hole 36c with respect to the axis Ax is set to about 30 °, and the radial deflection angle with respect to the axis Ax is set to about 20 °. However, each of these deflection angles can be appropriately changed according to the configuration of the duct 26, the size of the screw 4, and the like.

In this embodiment, the case where the pressurized air inflow device 28 is mounted in the middle of the duct 26 of the recovery device 20 in the thread rolling device has been described.
Even when the pressurized air inflow device 28 is used for other purposes, it is possible to obtain the same effects as the present embodiment by adopting the same configuration as that of the present embodiment.

[Brief description of drawings]

FIG. 1 is a plan view showing a thread rolling device incorporating a pressurized air inflow device according to an embodiment of the present invention.

FIG. 2 is a plan view showing in detail a duct and a pressurized air inflow device of the thread rolling device.

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, showing in detail the configuration of the pressurized air inflow device and its peripheral portion.

FIG. 4 is a perspective sectional view (a) showing a main part of FIG. 3 and a sectional view (b) taken in the direction of the arrow b.

FIG. 5 is a cross-sectional view (a) of a main part and its b, showing a conventional example.
Sectional view (b)

FIG. 6 is a sectional view (a) of a main part and a sectional view (b) taken in the direction of the arrow b, showing another conventional example.

[Explanation of symbols]

2 screw material 4 screws 12 Rolling mechanism 14 Screw material supply mechanism 16 Fixed die plate 16a, 18a Rolled surface 18 Moving die plate 20 Recovery device 22 Air nozzle 24 Collection container 26 ducts 26a Rolling completion position side open end (other open end) 26b Open end of collection container (one open end) 28 Pressurized air inflow device 30 suction nozzle 32 pipes 32a, 36a, 38a Airflow passage 34 tubes 36 upstream member 36b annular flange 36b1 upstream end face 36b2 downstream end face 36c Air injection hole 36c1 upstream opening 36c2 Downstream opening 38 Downstream member 38b Tube mounting sleeve 38c communication hole 40 pressurized air hose 42 Connector 42a Pressurized air inflow path 44, 48 volt 46 annular air chamber 50 connection plate Ax duct axis A Rolling start position B Rolling completion position

Claims (3)

[Claims] 1. A pressurized air inflow device, which is mounted in a midway portion of a duct for transporting parts, and which allows pressurized air from the outside to flow into the duct toward one opening end of the duct. At least one air injection hole for allowing air to flow into the duct is formed near the inner peripheral surface of the duct, and the direction of each of these air injection holes is at a predetermined angle with respect to the axial direction of the duct. It is set in the direction inclined in the circumferential direction,
A pressurized air inflow device characterized by the above. 2. A plurality of the air injection holes are formed at substantially equal intervals in the circumferential direction, and the inclination angles of these air injection holes are set to substantially the same value with respect to the axis of the duct. The pressurized air inflow device according to claim 1, wherein 3. The pressurization according to claim 1, wherein the duct is a duct arranged so as to extend from the vicinity of the rolling completion position to the vicinity of the recovery container in the thread rolling device. Air inflow device.