JPH018290Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic grindstone position correction device for a spring grinding machine.

Conventional devices detect the height of the coil spring and automatically move the distance between the upper and lower grindstones closer based on this detection signal, thereby correcting the opposing distance between the upper and lower grindstones that has changed due to wear of the grindstones. However, with this method, there is a step between the lower grinding wheel and the spring mounting surface of the machine body, and this step causes the coil spring that is inserted into the holding hole of the work table to move from the spring mounting surface onto the lower grinding wheel. There was a flaw in the inability to make a smooth transition. The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a work table of the spring grinder, which is configured to be rotated in a predetermined direction by a rotating shaft (not shown). On the outer periphery of the work table 2, spring holding holes 4 are transparently provided at predetermined intervals in the thickness direction of the work table 2. Reference numeral 6 denotes a grindstone wear detection device, and one end of a swing arm 8 is rotatably supported by a bracket 10. Reference numeral 14 denotes a support shaft whose one end is pivotally supported by the swing arm 8, and a disk member 16 made of superalloy and excellent in wear resistance is fixed to the other end of this shaft. The support shaft 14 is supported in a vertical hole provided in the bracket 10 so as to be slidable in the vertical direction. The disk member 16 is arranged directly above the alignment line of the holding holes 4 of the work table 2 at a predetermined interval in the direction perpendicular to the work table 2. Reference numeral 18 denotes a touch switch disposed on the bracket 10, the tip of the detection shaft of which faces the upper surface of the other end of the swing arm 8. 20 is a cylindrical body fixed to the body 22, and a screw rod 24 is rotatably held in a fixed position via a ball bearing. Numeral 26 is a nut that is slidably fitted onto the inner circumferential surface of the cylindrical body 20, and the nut 26 is screwed into the screw fitting 24. A key member 28 is slidably fitted into a long hole formed in the side wall of the cylinder 20 along the longitudinal direction, and the nut 26 is fixed to one side of the key member 28, and the nut 26 is fixed to the other side of the key member 28. The bracket 10 is fixed. 30 is a handle fixed to the upper end of the screw rod 24;
is a spring mounting surface formed on the fuselage. The mounting surface 32 constitutes a reference surface 78, and a coil spring 8 that is inserted into the holding hole 4 of the work table 2.
The lower end of the grinding wheel 6 is slidably mounted on the mounting surface 32, and the coil spring 86 is configured to move from above the mounting surface 32 to above the lower grindstone 70 as the work table 2 rotates. . 34 is a timer, 36 is a solenoid valve, and 38 is a hydraulic rotary cylinder, each of which has a bevel gear 40 fixed to its output shaft. 42 is an electromagnetic clutch, and a bevel gear 44 is fixed to one shaft of the electromagnetic clutch, and the bevel gear 44 meshes with the bevel gear 40. 46
48 is a gear fixed to the other shaft of the electromagnetic clutch 42, and 48 is a screw shaft rotatably supported by a cylindrical body (not shown) fixed to the fuselage, to which a nut member 50 is screwed. There is. Nut member 5
0a is slidably fitted to the inner circumferential surface of the cylindrical body. A long hole is formed in the side wall of the cylinder along the longitudinal direction, a key member 50 is slidably fitted into the long hole, and a nut member 50 is fitted on one side of the key member 50.
is fixed, and a support member 52 is fixed to the other side. 54 is a gear fixed to the screw shaft 48, and the gear 54 meshes with the gear 46. Reference numeral 56 denotes an upper grindstone head held by the member 52, and has a built-in speed reduction mechanism. An upper grindstone 58 is fixed to the lower end of the output shaft of the head 56. The upper end of the input shaft of the head 56 is connected to a rotary drive device (not shown). 60 is a directional control solenoid valve for cylinder control, 62 is a hydraulic cylinder, 64 is an electromagnetic clutch, 66 is a screw shaft, 68 is a lower grinding wheel head, and 70 is a lower grinding wheel. The transmission mechanism on the lower grindstone 70 side is the same as the transmission mechanism on the upper grindstone 58 side. The grindstone wear detection device 6 is located behind the upper and lower grindstones 58 and 70 with respect to the rotational direction of the work table 2. 72 and 74 are monolever switches; 76 is a fixed scale shaft installed on the machine body 22 in parallel with the screw shaft 48;
8. A scale is engraved to display the height of the lower surface. 80 is a bracket fixed to the fixed scale shaft 76, and a level sensor 82 is attached thereto. The level sensor 82 may be a capacitance type sensor, an air micrometer, or the like. The detection head of the level sensor 82 faces the polishing surface of the lower grindstone 70, and in this embodiment, the detection head of the sensor 82 and the grindstone 70
The distance to the polished surface is set to 0.1mm, and the distance is
The sensor 82 is set to output an ON signal when it becomes 0.1 mm or less. The polished surface of the lower grindstone 70 in a non-wearing state is the spring mounting surface 3.
2, that is, the same height level as the setting reference plane 78. The level sensor 82 is connected to a control section (not shown) of the electromagnetic clutch 64, and is configured so that the electromagnetic clutch 64 is disengaged when the sensor 82 outputs an ON signal. 84 is the support member 5
2, and is opposite to the graduations of the scale axis 76. Electrical devices such as the touch switch 18, level sensor 82, electromagnetic clutches 42, 64, timer 34, electromagnetic valves 36, 60, monolever switches 72, 74, etc. are electrically connected as shown.

Next, the operation of this embodiment will be explained.

A case will be described in which the distance between the upper grindstone 58 and the lower grindstone 70 is set to a predetermined value when the wear amount of each of the upper grindstone 58 and the lower grindstone 70 is zero. First, move the switch lever 74 to the manual side to disengage the electromagnetic clutch 64. Next, the screw shaft 66 is manually rotated, the head 70 is moved and adjusted along the screw shaft 66, and the polishing surface of the lower grindstone 70 is aligned with the reference surface 78. . In this state, the distance between the detection head of the level sensor 82 and the polishing surface of the grindstone 70 is set to exactly 0.1 mm.

Next, turn the lever of the monolever switch 72 to the manual side. The electromagnetic clutch 42 is thereby disengaged. Next, when the screw shaft 48 is manually rotated, the nut member 50 moves in the vertical direction along the screw shaft 48. When setting the grinding wheel interval to 85 mm, for example, the rotation of the screw shaft 48 is stopped when the index 84 coincides with 85 on the scale of the fixed scale shaft 76. As a result, the distance between the grinding wheels, that is, the facing distance between the polishing surface of the upper surface grindstone 58 and the polishing surface of the lower surface grindstone 70 is set to 85 mm. Next, the screw rod 24 is rotated to appropriately set the height of the disk member 16 relative to the mounting surface 32 in accordance with the grindstone interval. The height of the disc member 16 is the height of the upper and lower grinding wheels 5 set at a distance of 85 mm between the grinding wheels.
The level is set such that the upper end of the coil spring 86 whose both ends are polished by the wheels 8 and 70 passes close to each other, and the polishing surfaces of the upper and lower grinding wheels 58 and 70 are worn away, and the coil spring after polishing is The upper end of the coil spring 86 is set to collide with the lower surface of the disc member 16 when the spring height of the coil spring 86 increases beyond a predetermined value beyond a permissible range. When the amount of wear on the grindstones 58 and 70 is zero, the wear display dial (not shown) displays zero. Next, turn the levers of monolever switches 72 and 74 to the automatic side. This causes the electromagnetic clutch 42
The switch installed in the power supply circuit of the coil is
It turns ON and the electromagnetic clutch 42 engages. Further, the electromagnetic clutch 64 is configured such that one of the two switches connected in series with the power supply circuit of the coil is activated.
It becomes ON. The other switch is set so that when the level sensor 82 is turned off, a relay is activated and the relay is turned on. Next, the grindstones 58 and 70 are driven to rotate, and the work table 2 is rotated in a predetermined direction. The coil springs are automatically inserted one by one into the holding holes 4 of the work table 2 by a separately provided automatic feeding device. The coil spring 86 brought between the grindstones 58 and 70 by the rotation of the work table 2 has both ends polished by the polishing surfaces of the grindstones 58 and 70, and is ground to a predetermined spring height. . The coil spring that has been polished passes through the lower surface of the disc member 16 of the detection device 6, and is then discharged and dropped from the holding hole 4 into the container below by an automatic discharge device (not shown). While the above-mentioned polishing work is continuously performed, the polishing surfaces of the grindstones 58 and 70 are worn, and the gap between the grindstones becomes wider by the amount of wear. As a result, both ends of the coil spring are not sufficiently ground and polished, and the spring height of the coil spring 86 after polishing increases. At this time, the grindstone 70
When the distance between the polishing surface of the polishing surface and the detection head of the level sensor 82 exceeds 0.1 mm due to wear of the polishing surface, the power supply circuit of the coil of the electromagnetic clutch 64 is closed and the electromagnetic clutch 64 is engaged. If the amount of increase in the spring height of the coil spring 86 after grinding exceeds the allowable value, the upper end of the coil spring 86 after grinding will be
It collides with the disc member 16 and pushes the disc member 16 upward. As a result, the support shaft 14 rises, and the singing arm 8 swings about the shaft 12 in the counterclockwise direction of rotation of the hour hand in the figure, and comes into contact with the shaft of the touch switch 18. This causes the touch switch to turn on momentarily.
and outputs a pulse signal. This pulse signal is supplied to the coil of a solenoid valve 36 via a timer 34. Further, the pulse signal of the switch 18 is supplied to the coil of the solenoid valve 60, and the solenoid valves 36, 60
When the spool operates, the output shaft of the hydraulic rotary cylinder 62 first rotates a predetermined amount in a predetermined direction, and this rotational movement is transmitted to the screw shaft 66 via the bevel gears 90, 92, the clutch 64, and the gear, and The grindstone 70 rises by a predetermined amount. Subsequently, after a predetermined period of time, the output shaft of the hydraulic rotary cylinder 38 rotates a predetermined amount in a predetermined direction, and this rotational movement is caused by the bevel gears 40,
The rotation of the screw shaft 48 causes the nut member 50 and the upper grindstone 58 that interlocks the nut member 50 in the vertical direction to descend by a predetermined amount.

By automatically performing the above operation one or more times, the amount of wear of the upper and lower grindstones 58, 70 is corrected, and the distance between the grindstones is automatically corrected to a predetermined distance (85 mm). When the distance between the polishing surface of the lower grindstone 70 and the detection head of the level sensor 82 becomes 0.1 mm, the level sensor 82 outputs an ON signal.
This ON signal activates a relay, opens one switch in the power supply circuit of the coil of the electromagnetic clutch 64, and disengages the electromagnetic clutch 64. Therefore, in this state, even if a pulse is supplied to the coil of the electromagnetic valve 60, the grinding wheel 70 does not rise, and its polishing surface automatically maintains the same height level as the absolute reference surface 78.

In addition, when implementing the present invention, the tip of the touch switch may be directly placed instead of the disc 16,
In addition, various other structures can be considered for the grindstone wear amount detection device 6, so it is not particularly limited to the illustrated structure. Also, by one output pulse of the touch switch 18, the lower grinding wheel 70 and the upper grinding wheel 58
In addition to this time difference interlocking method, one output pulse from the touch switch 18 causes the lower grindstone 70 to move first, and the next output pulse from the touch switch 18 moves the upper grindstone 58. It is possible to adopt an independent movement method in which the objects move alternately. In addition, level sensor 8
The operation of the electromagnetic valve 60 may be prevented based on the second output signal.

As described above, the present invention drives the upper and lower grinding wheels toward each other by a predetermined amount based on the output signal of the overlong spring detection device that detects whether the spring is larger or smaller than a predetermined spring height and outputs an on/off signal. In the automatic grinding wheel position correction device,
A level sensor is provided that outputs a detection signal when the lower grinding wheel reaches the spring mounting surface, and when the level sensor outputs a detection signal, the electromagnetic clutch provided in the drive transmission system of the lower grinding wheel is disconnected, and driving force is applied to the lower grinding wheel. Since no transmission is made, there is an effect that the lower grindstone can always be aligned with the spring mounting surface using a simple mechanism.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing preferred embodiments of the present invention. 2... Work table, 4... Holding hole, 6... Grindstone wear detection device, 16... Disc member, 18... Tatchment, 24... Screw rod, 32... Placement surface, 34
...Timer, 36...Solenoid valve, 38...Cylinder,
40... Bevel gear, 42... Electromagnetic clutch, 44... Bevel gear, 48... Screw shaft, 54... Gear, 56
...Top grindstone head, 58...Top grindstone, 60...Solenoid valve, 62...Hydraulic cylinder, 64...Electromagnetic clutch, 66...Screw shaft, 68...Bottom grindstone head, 70...Bottom grindstone, 78...Setting reference plane, 82...
level sensor.

Claims (1)

[Scope of utility model registration request] A work table 2 is rotatably supported in a predetermined direction and has a large number of spring holding holes 4 arranged at equal intervals on its outer periphery for holding a coil spring 86 to be ground, and the work table 2 is arranged below the work table 2. A spring mounting surface 32 on which the lower end of the coil spring 86 is placed, and a coil spring grinding surface arranged to sandwich the work table 2 so as to be opposite to the moving path of each spring holding hole 4. A pair of upper and lower surface grindstones 58, 70, and an overdrive located behind the grindstones 58, 70 that detects whether the spring in the spring holding hole 4 is larger or smaller than a predetermined spring height and outputs an on/off signal. a long spring detection device 6; and a drive device that drives the pair of upper and lower surface grindstones 58, 70 by a predetermined amount in a direction toward each other based on a detection signal of the overlong spring detection device 6;
An electromagnetic clutch 64 disposed between the drive device and the lower grinding wheel 70 detects the level of the polishing surface of the lower grinding wheel 70, and ensures that the polishing surface is at the same level as the spring mounting surface 32. Consisting of a level sensor 82 that outputs a detection signal when located,
An automatic grindstone position correction device for a spring grinding machine, characterized in that the electromagnetic clutch 64 is disengaged when the level sensor 82 outputs a detection signal.