JP2847226B2 - Work-loading system for centerless grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer system for a centerless grinding machine, and more particularly, to a rod-like work group in which foreign substances such as gravel are mixed through a pre-process such as barrel finishing. The present invention relates to a system that receives, sorts only a target work in the middle of the transfer, and automatically carries it into a centerless grinding machine.

[0002]

2. Description of the Related Art For example, in a general manufacturing process of a rod-shaped work such as a motor microshaft, a long rod-shaped member is first cut into a bar-shaped semi-finished product of a predetermined size, and then subjected to polishing by barrel finishing. Then, the cut portion is deburred and the like, and finally, the outer peripheral surface is ground to a predetermined diameter by a through-feed grinding or the like using a centerless grinding machine to obtain a finished product.

[0003] By the way, the bar-shaped workpiece group which has been finished with the above barrel finishing includes a polishing stone (gravel) used in the barrel finishing, and a workpiece having a different diameter mixed at the same time as the barrel finishing or other barrel finishing. Usually, many foreign substances are mixed.

[0004] Therefore, when performing grinding by a centerless grinding machine, the rod-shaped work group is preliminarily sorted into a work and a foreign matter, and the work is further sorted according to a diameter dimension, and only the target work is loaded into the work loading device. In general, a method of carrying the material into a centerless grinding machine via a crusher is used.

[0005]

However, since all of the conventional sorting processes are performed manually by hand, the work efficiency is extremely poor, the sorting work takes a long time, and the production process in a mass production site is smooth. Not only does this significantly impede the flow, but also because precise inspection is not possible, it is not possible to completely avoid the possibility that different-diameter workpieces that are out of the permissible diameter are still mixed in, and furthermore, to automate the production process. Was also blocked.

The present invention has been made in view of such a conventional problem, and receives a bar-shaped work group which has undergone a pre-process such as barrel finishing as it is, and sorts only a target work in the course of its conveyance. To provide a system for automatic loading into a centerless grinding machine.

[0007]

In order to achieve the above-mentioned object, a work carrying system for a centerless grinding machine according to the present invention comprises a rod-shaped work group in which foreign matters such as gravel are mixed.
A large foreign matter discriminating device that sorts out and removes large foreign matter having a shape and size larger than the target work, and a different diameter foreign matter that deviates from the allowable diameter dimension from the work group from which the large foreign matter has been removed by the large foreign matter discriminating device. A foreign matter discriminating device that sorts out and eliminates
The apparatus further comprises a short foreign matter discriminating apparatus that selects and removes short foreign matters shorter than the target work from the work group from which the different diameter foreign matters have been removed by the different foreign matter discriminating apparatus.

[0008]

In the work carrying system according to the present invention, when a group of rod-like works in which foreign matter such as gravel is mixed is directly input into a large-sized foreign matter discriminating apparatus, the large foreign matter having a larger shape and size than the target work is removed. After sorting and eliminating, only the remaining work group is transported to the different-diameter foreign matter discriminating device, where the different-diameter foreign material that is out of the allowable diameter is sorted out and eliminated. Short and short foreign matter is sorted out and eliminated, and finally only the target work is carried into the centerless grinding machine. All of these series of sorting and conveying operations are automatically controlled.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a work loading system for a centerless grinding machine according to the present invention.
Parts feeder 2 the entered rodlike workpiece group from (primary work group) W ₁ from the target workpiece W, W, ... only the sorted, intended to carry the centerless grinding machine 3 for through-feed grinding, base 4 above The apparatus further comprises a large foreign matter discriminating device 5, a foreign material discriminating device 6 and a short foreign matter discriminating device 7. 3a is a grinding wheel of the centerless grinding machine 3, and 3b is an adjusting wheel.

Hereinafter, the structure of each of these discriminating devices will be specifically described. The large foreign matter determination unit 5, among the primary work group W ₁ supplied from the parts feeder 2, intended to eliminate sorted large large foreign substances 60 geometry than the target workpiece W, the specific The typical structure is shown in FIGS.

The large foreign matter discriminating apparatus 5 includes a main transport conveyor 10 as a first transport conveyor, an auxiliary transport conveyor 11 as a second transport conveyor, a work sorting unit 12,
A work transfer path 13 is provided as a main part.

The main conveyor 10 is provided with a work feeding direction A
, And is provided continuously to the work transport path 30 of the different-diameter foreign matter determination device 6. As shown in FIG. 4, the transfer surface 10a of the main transfer conveyor 10 is provided so as to be inclined downward (inclination angle α) perpendicular to the workpiece feed direction A (perpendicular to the paper surface). Thus, the primary work group W ₁ on the conveying surface 10a is guided toward the workpiece selector 12 by the guiding portion 18 cooperation of which will be described below with the inclination of the conveying surface 10a.

The auxiliary transport conveyor 11 is provided adjacent to the main transport conveyor 10, that is, parallel to the lower side of the transport surface 10a, and extends in a direction opposite to the workpiece feeding direction A (arrow). (In the direction of the mark B).

As shown in FIG. 3, the auxiliary transport conveyor 11 is inclined downward in the work feeding direction A, in other words, the upward inclination (inclination angle θ) with respect to the traveling direction B in a normal state. It has been. As shown in FIG. 4, the transfer surface 11a of the auxiliary transfer conveyor 11 is inclined (inclination angle β) to the opposite side to the transfer surface 10a of the main transfer conveyor 10, and both transfer surfaces 10a, 11a are It is in a form facing each other. Then, these two conveying surface 10a, straddling 11a, primary work group W ₁ from the parts feeder 2 is turned on.

A drive motor 14 for the main conveyor 10, a drive motor 15 for the auxiliary conveyor 11, and a volume 16 for adjusting the rotational speeds of these two drive motors are provided on the side of the large foreign matter discriminating device 5. 17 are provided.

The transfer surface 1 of the main transfer conveyor 10
On the upper side 0a, the work sorting unit 12 is provided in a lower part in the inclined direction in a state of not contacting the transport surface 10a.

The work selecting section 12 has a height dimension over which a large foreign matter having a larger shape and size than the work W can get over. That is, in FIG. 4, the height h from the transfer surface 10a of the main transfer conveyor 10 to the upper surface 12a of the work sorting unit 12 is set to substantially the same size as the radius R of the target work W, that is, slightly larger than の of the diameter D. Have been.

[0019] Thus, among the primary work group W ₁ to fall along the conveying surface 10a to the work sorting section 12 side, the radius R less small particles of the workpiece W and the workpiece W on the supporting surface 12b of the selector 12 On the other hand, large foreign matters 60, 60,..., Such as gravel and large-diameter work, which are larger than the radius R of the work W, fall over the sorting section 12 and fall onto the auxiliary transport conveyor 10 while being securely held. I do.

Further, as shown in FIG.
2 is provided so as to extend from the downstream end of the auxiliary conveyor 11 to the upstream end of the main conveyor 10 and is provided on the upstream side of the guide portion 18. The primary work group W ₁ is moved along the guide surface 22 a of the work circulating section 22 by the main transport conveyor 10.
And is guided to the workpiece selecting unit 12 along the guide surface 18 a of the guide unit 18.

A work guide section 19 is provided at a position above the transfer surface 10a in the direction of inclination with respect to the work selection section 12. The workpiece guide portion 19 is for guiding the travel of the workpiece selector 12 large foreign matter is eliminated secondary work group W _2, provided that the workpiece guide surface 19a is continuous to the guide surface 18a Have been.

The work transfer path 13 is formed by the guide surface 19a of the work guide section 19 and the support surface 12b of the work selection section 12, and is connected to the upstream end of the work transfer path 30. .

The driving force of the secondary work group W ₂ conveyed along the work conveyance path 13 is given by the main conveyance belt 10. Width M of the work transfer path 13 (see FIG. 4)
Are set to be substantially the same dimensions slightly larger than the diameter of the target work W.

The work guide 19 is provided with a tightening bolt and nut 2 for the elongated hole 24a of the support bracket 24.
The width dimension M of the work transfer path 13 can be adjusted by adjusting the positional relationship of No. 5.

The large foreign matter discriminating apparatus 5 includes work sensors 20 and 21 for detecting the state of the work group W ₁ on the main conveyor 10 and the auxiliary conveyor 11.

[0026] While the workpiece sensor 20 is an optical sensor, a pair of projector 20a which is attached to the downstream end and the upstream end of the auxiliary conveyor 11 consists of a light receiver 20b, a work group W ₁ on the auxiliary conveyor 11 Detect if it exists.

The other work sensor 21 is a magnetic sensor,
Work in the work group W ₁ on the auxiliary conveyor 11 (metal) detects whether there.

The work sensors 20, 21
The main transport conveyor 10, the auxiliary transport conveyor 11, and the parts feeder 2 are configured to be automatically controlled in conjunction with each other according to the detection result.

More specifically, when it is detected by the optical sensor 20 that the work group W ₁ is small or absent on the auxiliary conveyance conveyor 11, the primary work group W ₁ is sent from the parts feeder 2 to the main conveyance conveyor 10. Supplied above.

Further, the magnetic sensor 21, when the workpiece in the workpiece group W ₁ on the auxiliary conveyor 11 (metal) that is not or there less sensed, the auxiliary conveyor 11 is reversely driven in the direction A It has been, all (in this case, large foreign materials 60, 60 of the most like gravel, ...) primary work group W ₁ present thereon recovery container 23a
After being discharged to the main transport conveyor 10, the primary work group W ₁ is driven forward again in the B direction, and the primary work group W ₁ is supplied onto the main transport conveyor 10 from the parts feeder 2.

The different-diameter foreign matter discriminating device 5 sorts out and removes the different-diameter foreign materials 61 out of the allowable diameter dimension D ± a from the secondary work group W ₂ sent from the large-diameter foreign material discriminating device 4. This is provided continuously on the downstream side of the large foreign matter discriminating device 4, and its specific structure is shown in FIGS.

The foreign径異discrimination system 5, a work conveying path 30 for conveying the secondary work group W ₂ from the large foreign matter determination unit 5, a laser measuring device 31 is an optical measuring instrument, the allowable diameter A foreign-matter foreign matter eliminator 32 for removing foreign-matter foreign matter 61 out of D ± a is provided as a main part.

The work transfer path 30 is provided on the upper surface of the support frame 33, and includes an upstream transfer path 34, a central transfer path 35
And a downstream transport path 36, which are shown in FIG.
As shown in FIG. 5, the transfer surface 30a is in the form of a V-chute having a V-shaped cross section.

The upstream end of the work transfer path 30 is continuous with the work transfer path 13 of the large foreign matter discriminating apparatus 5, and the downstream end thereof is connected to the work transfer path 46 of the short foreign matter determination apparatus 7 described later. ing. The driving force of the secondary workpiece group W ₂ conveyed on the conveying surface 30a of the work conveyance line 30,
Provided from the main conveyor 10 of the large foreign matter discriminating apparatus 5.

The laser measuring device 31 scans and measures the diameter of the secondary work group W ₂ with laser light.
5 comprises a pair of light projectors 31a and light receivers 31b arranged across the measurement slit 37.

Then, as shown in FIG. 7, the laser measuring device 31 applies a thin linear laser beam LB to the workpiece passing through the measuring slit 37 of the central transport path 35 from the vertical direction of the transport direction A. It is incident and its diameter is scanned at high speed. The detection conditions and the like of the laser measuring device 31 are appropriately set by a control panel 51 provided above the short foreign matter discriminating device 7.

The different-diameter foreign matter eliminator 32 is of an electric type, and includes a solenoid-type rotary actuator 38 and a discharge gate 39 provided with a downstream transfer path 36 of the work transfer path 30. The rotary actuator 38 is attached to a rotary shaft 38a.

When the rotary actuator 38 is turned on in accordance with the detection result of the laser measuring device 31, its rotary shaft 3 is turned on.
After 8a rotates by a certain angle in the direction of arrow C, it reversely returns to the original position. This ON operation is performed instantaneously.

Then, the laser measuring device 31 detects a foreign substance 61 of a different diameter outside the allowable diameter dimension D ± a, and when the foreign substance 61 moves on the downstream conveying path 36 which is a discharge chute, the foreign matter 61 By ON operation,
The discharge gate 39 momentarily rotates in the discharge direction C,
The foreign matter 61 of different diameter on the discharge chute 36 is collected
to b.

The short foreign matter discriminating device 6 is for selecting and removing short foreign matters shorter than the length L of the target work W from the tertiary work group W ₃ sent from the different diameter foreign matter discriminating device 5. And is provided continuously on the downstream side of the different-diameter foreign matter discriminating device 5, and its concrete structure is shown in FIGS.
Shown in

The short foreign matter discriminating apparatus 7 includes a pair of upper and lower conveying roller rows 40 and 41 as main parts. The pair of transport roller rows 40 and 41 include a plurality of transport rollers 4.
Are alternately arranged at regular intervals in upper and lower stages, and a lower conveying roller 4 is provided at an upstream end and a downstream end.
3, 43 are located.

The outer circumference of each of the transport rollers 42, 43,.
An annular groove 44, 45 is formed, respectively, and a work transfer path 46 is formed between the upper and lower transfer roller rows 40, 41 by these annular grooves 44, 44,.

The annular groove 44 and the annular groove 45 have a substantially arc-shaped cross section, and the diameters of the arcs of the annular grooves 44 and 45 are different from each other. Then, the transport rollers 42,
By moving and adjusting 43,... In the axial direction, two types of target works W can be transported.

Conveying rollers 42 and 4 adjacent in the feed direction A
The arrangement intervals are set such that the target work W is supported by the annular grooves 44, 44, ... or 45, 45, ... of the three continuous transport rollers 42, 43, 42 or 43, 42, 43. Have been. Also, the upper conveying roller 43
And the interval between the lower conveying rollers 42 in the height direction is set such that the interval between the bottom surfaces of the annular grooves 44, 44 or 45, 45 is slightly smaller than the diameter D of the target work W. Thus, the work transfer path 46 is a zigzag transfer path that is alternately inclined in the vertical direction.

Are all rotationally driven by a single drive motor 47. That is, the roller shaft 4 of these transport rollers 42, 43,.
2a, 43a,... Have driven pulleys 42b, 4 respectively.
Are connected to a drive pulley 47a of the drive motor 47 by a single endless transmission belt 48 via a tension pulley 49. The tension pulley 49 is for adjusting the tension of the endless transmission belt 48. 50 is the drive motor 4
7 is a volume for adjusting the rotation speed.

The tertiary work group W ₃ sent from the work transfer path 30 of the different-diameter foreign matter discriminating device 6 travels along the work transfer path 46 between the transfer roller arrays 40 and 41 as shown in FIG. Since the sheets are conveyed in a zigzag state in the vertical direction, gaps are generated between the adjacent works. As a result, the short foreign matter 62 shorter than the length L of the target work W drops from between the lower conveying rollers 42 and is discharged to the collection container 23c.

In the work loading system 1 configured as described above, the primary work group W ₁ in which foreign matter such as gravel is mixed from the parts feeder 2 is transferred to the main transport conveyor 10 of the large foreign matter determination device 4. Once turned on, by the work sorting section 12 and the workpiece transfer path 13, a large large foreign substances 60, 60 geometry than the target workpiece W, ... are eliminated, the remaining secondary work group W ₂ is different It is transported to the diameter foreign matter discriminating device 6.

The secondary work group W ₂ conveyed to the different-diameter foreign matter discriminating device 6 is sequentially scanned at a high speed by the laser measuring device 31 at its diameter, and only the different-diameter foreign matter 61 out of the allowable diameter dimension D ± a. There are excluded, the remaining tertiary work group W ₃ is conveyed to part length foreign matter determination unit 7.

The tertiary work group W ₃ conveyed to the short foreign matter discriminating device 7 is forcibly conveyed in a zigzag state by a pair of upper and lower conveying rollers 40 and 41, and the length of the target work W is Short foreign matters 62, 62, ... shorter than the dimension L
Are removed, and only the finally remaining target works W, W,... Are continuously carried into the centerless grinding machine 3 via the carry-in V chute 62.

The present invention is not limited to the above-described embodiment, and can be variously modified in design. The specific structure of the device 7 is not limited to the illustrated example, and the design can be appropriately changed within a range having the same function as these.

[0051]

As described in detail above, according to the present invention,
A bar-like work group containing foreign matter such as gravel is received as it is through a pre-process such as barrel finishing, and a large foreign matter discriminating device, a different diameter foreign matter discriminating device, and a short foreign matter discriminating device are provided in the middle of the conveyance. The device 7 automatically sorts and removes large foreign matter having a larger shape and size than the target work, foreign matter having a different diameter from the allowable diameter dimension, and short foreign matter shorter than the target work. Since only the products are sorted and transported to the centerless grinding machine, the sorting process, which was conventionally performed manually by hand, is completely unnecessary, and labor-saving automation and unmanned operation of each process (selection of foreign matter and sorting of workpieces) in the sorting process are eliminated. Can be effectively handled.

Since the sorting operation is performed in a short time and reliably, not only does not impair the smooth flow of the production process particularly in a mass production site, but also precise sorting is possible, and the sorting of only the target work is reliably performed. It is possible to fully automate the production process. Incidentally, tests have shown that the device is extremely effective in performing unmanned operation for 72 hours.

[Brief description of the drawings]

FIG. 1 is a plan view showing a work carrying system for a centerless grinding machine according to an embodiment of the present invention.

FIG. 2 is a plan view showing a large foreign matter discriminating apparatus of the work carrying system.

FIG. 3 is a side view showing the large foreign matter discriminating apparatus.

FIG. 4 is a sectional view of the large foreign matter discriminating apparatus taken along the line IV-IV in FIG. 1;

FIG. 5 is a plan view showing a different-diameter foreign matter discriminating device of the work carrying system.

6 is a cross-sectional view of the different-diameter foreign matter discriminating apparatus taken along line VI-VI in FIG. 5;

FIG. 7 is a sectional view of the same-size foreign matter discriminating apparatus, taken along VII-VII in FIG.
It is sectional drawing along the line.

FIG. 8 is a side view showing the partially different-sized foreign matter discriminating apparatus in a partially cut-away manner.

FIG. 9 is a side view showing a short foreign matter discriminating apparatus of the work carrying system.

FIG. 10 is a sectional view of the short foreign matter discriminating apparatus taken along line XX in FIG. 9;

FIG. 11 is an enlarged side view for explaining a work sorting operation by a row of conveying rollers of the short foreign matter discriminating apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Work loading system 2 Parts feeder 3 Centerless grinder 5 Large foreign substance discriminating apparatus 6 Different diameter foreign substance discriminating apparatus 7 Short foreign substance discriminating apparatus 10 Main transport conveyor (first transport conveyor) 10a Transport surface of main transport conveyor 11 Auxiliary Transfer conveyor (second transfer conveyor) 11a Transfer surface of auxiliary transfer conveyor 12 Work sorting unit 13 Work transfer path 18 Guide unit 18a Guide surface of guide unit 19 Work guide unit 19a Work guide surface 20 Work sensor (optical sensor) 21 Work Sensor (magnetic sensor) 30 Work transport path 31 Optical measuring device (laser measuring instrument) 32 Different diameter foreign matter eliminator (Solenoid type different diameter foreign matter eliminator) 34 Upstream transport path 35 Central transport path 36 Downstream transport path (discharge chute) 37 Slit for measurement 38 Solenoid type rotary actuator 39 Discharge gate 40 Upper stage Transport roller row 41 Lower transport roller row 42 Upper transport roller 43 Lower transport roller 44, 45 Annular groove 46 Work transport path 60 Large foreign material 61 Different size foreign material 62 Short foreign material W ₁ Primary work group W ₂ 2 Next work group W ₃ Tertiary work group W Target work A Work feed direction

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23Q 7/12 B24B 31/16

Claims (5)

(57) [Claims] 1. A system in which only a target work is selected from a rod-shaped work group in which foreign matter such as gravel is mixed and carried into a centerless grinding machine, wherein the work group has a shape and a size larger than that of the target work. A large foreign matter discriminating device that sorts and removes large foreign matter, and a different diameter that sorts out and removes different diameter foreign matter that deviates from the allowable diameter from a work group from which the large foreign matter has been removed by the large diameter foreign matter discriminating device. A foreign matter discriminating apparatus; and a short foreign matter discriminating apparatus that selects and removes a short foreign matter shorter than the target work from a work group from which the different diameter foreign matter has been removed by the different diameter foreign matter discriminating apparatus. Centerless grinding machine work loading system. 2. The apparatus according to claim 1, further comprising a conveyor having a conveyor surface inclined in a direction perpendicular to a workpiece feeding direction, wherein a lower portion of the conveyor in the inclination direction has a shape larger than a radius of a target workpiece. 2. A sorting section having a height dimension over which a large foreign matter having a large size can get over is provided.
2. The work-loading system for a centerless grinding machine according to item 1. 3. An apparatus for discriminating foreign matter having different diameters, comprising: an optical measuring device for optically measuring the outer diameter of a work; 2. A device for removing foreign matter having a different diameter.
2. The work-loading system for a centerless grinding machine according to item 1. 4. The apparatus for discriminating foreign matter having different diameters is arranged across a work transfer path for transferring a work group from which large foreign matter has been removed by the large foreign matter determination apparatus and a cutting space in the middle of the work transfer path. A laser measuring device, and an electric type foreign matter foreign matter remover that removes the work transport path downstream of the laser measuring device, and foreign matter deviating from the permissible diameter by the laser measuring device. 4. The work carrying system for a centerless grinding machine according to claim 3, wherein when detected, the work transfer path of the electric type foreign-matter foreign matter remover instantaneously removes the foreign-matter foreign matter. 5. The short foreign matter discriminating apparatus includes a pair of upper and lower conveying roller arrays, and the pair of conveying roller arrays includes:
A plurality of forced conveying rollers are alternately arranged in two rows at regular intervals, and a work conveying path is formed between the two conveying roller rows, and the work conveying path has a zigzag conveying path which is alternately inclined. 2. The system according to claim 1, wherein the system is a road.