JPH10296606A - Automatic grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically grind a welding bead part such as an iron plate, wound on a leg surface for reinforcing a bridge pier, by constituting a grinding belt position-adjustably with an article to be worked by a position adjusting device provided on a grinding attachment. SOLUTION: This automatic grinding attachment is equipped with a main body 20, traveling on a travel rsil 1 detachably fitted to an article 100 to be worked bar a magnet 5, and a grinding attachment 60 oscillatingly fitted to the main body 20. The grinding attachment 60 is oscillated with a spindle 64 as the center to the main body 20, to adjust a position for keeping an abutting angle to the article 100 to be worked. A welding bead part is ground while moving the main body 20 along the travel rail 1 in this condition. Consequently the welding bead part can be automatically and efficiently ground, thereby shortening a work time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic grinding apparatus for grinding a bead portion formed by swelling from the surface of an iron plate when the iron plate is welded in abutting state so that the bead portion is substantially flush with the surface of the iron plate. More particularly, the present invention relates to an automatic grinding apparatus suitable for grinding a weld bead of an R-curved steel plate provided around a pier to reinforce the pier.

[0002]

2. Description of the Related Art Conventionally, a thickness of a plate which is manufactured by a rolling mill in a running state and is sequentially moved to a product storage area while being moved together with the same plate while grinding and removing flaws on the surface of the plate. An automatic plate polishing apparatus is known (for example, Japanese Patent Publication No. 51-14317). This automatic thick plate polishing machine
A pair of upright machine frames facing each other is provided on the upper surface of both ends of the horizontal base, and a horizontal guide rod and a horizontal reciprocating rotary screw are erected or shafted on these upright machine frames, and slid along the horizontal guide rod. A horizontal reciprocating rotary screw is screwed into a screw hole drilled in the main body, and magnet support legs are provided at both ends of the lower surface of the horizontal base plate, and the main body is provided with a vertically movable tiltable Downward horizontal rotating grindstones are arranged on both sides of the horizontal base plate rather than the magnet support legs, and a lifting handle is provided at the top of both upright machine frames.

In the automatic polishing apparatus, during operation, several persons lift the main body with a handle on a thick plate, mount the main body on the thick plate by a magnet type support leg, and fix the main body on the thick plate. When the main body and the downward horizontal rotary grindstone are reciprocated by the reciprocating rotation along the horizontal guide rod, the slightly inclined downward horizontal rotary grindstone automatically and efficiently finishes the flaws on the iron plate surface.

[0004]

By the way, in a pier reinforcement work for an overpass, etc. in preparation for a recent earthquake or the like, an iron plate is wound around a pier and welded, and then a weld bead portion is ground. It cannot be used for bridge pier construction because it is large and cannot be mounted on an R-curved surface. Poor portability and installation workability are also poor. In addition, dust is scattered around because grinding is performed with a rotating whetstone. However, there is a problem that the environment is deteriorated, and the operator is forced to grind the bead of the iron plate welded part manually.

Accordingly, the present invention provides an automatic grinding apparatus which is lightweight, compact and excellent in portability, and which can automatically grind a weld bead portion such as an iron plate wound on the surface of a pier to reinforce a pier. An object of the present invention is to provide a grinding device and solve the above-mentioned problems. This automatic grinding device enables the magnet adsorbed on the iron plate to swing freely, and the grinding device for grinding the bead can also be adjusted to swing according to the curved surface, so that the iron plate wound around the bridge pier etc. Can be used for bead grinding work on curved surfaces. Since the means for preventing the scattering of the grinding powder is provided, the main body of the grinding apparatus can be protected from the grinding powder scattered around during grinding. Since the feed speed of the automatic grinding device can be adjusted according to the load at the time of grinding, overload of the main motor can be prevented.
Further, by reducing the size and weight of the whole, even one worker can easily perform the bead grinding operation.

[0006]

The technical solution adopted by the present invention to achieve the above object has a traveling rail which can be detachably attached to the surface of the workpiece 100,
A main body is provided on the traveling rail so as to be detachable and movable, and a grinding device for grinding the surface of the workpiece is swingably provided on the main body, and the grinding device is rotated by a main motor in the same device. An endless grinding belt is provided, wherein the grinding belt is configured to be adjustable in position with a workpiece by a position adjustment device provided in the grinding device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an automatic grinding apparatus according to the present invention will be described below with reference to the drawings. First, an overall configuration and an outline of operation will be described, and then each component will be described in detail. . FIG. 1 is a front view of an automatic grinding apparatus according to the present embodiment, and FIG. 2 is a side view. In each of the figures, an automatic grinding device includes a traveling rail 1 that can be detachably attached to a workpiece 100 by a magnet 5, a main body 20 that can travel on the traveling rail 1, and a swingable rocker with respect to the main body. And a grinding device 60 attached thereto. The traveling rail 1 is configured so that it can be attracted to the workpiece 100 by a magnet 5 that is swingably attached to the traveling rail 1 via a bracket 4. It is mounted so as to be able to travel by appropriate driving means such as a gear mechanism.

As shown in FIG. 2, a grinding device 6 is provided on a main body 20 so as to be swingable about an axis 64 parallel to the axis of the traveling rail 1.
0, the grinding device 60 includes an endless grinding belt 67, and a bead portion formed on the surface of the workpiece 100 by the endless grinding belt 67 by driving a main motor in the grinding device 60. 101 can be ground. As shown in FIG. 3, the automatic grinding apparatus having the above-described configuration is attached to an iron plate or the like having an R-curved surface wound around a pier or the like by a magnet.
The grinding device 60 is swung about the shaft 64 with respect to the main body to adjust the contact angle with the workpiece 100. Then, in this state, the welding bead portion is ground while moving the main body 20 along the traveling rail 1. Further, the main body and the running rail are configured to be detachable by operating a slide knob 24 as shown in FIG. 4, and can be easily assembled on site.

Next, each component of the automatic grinding apparatus will be described in detail. [Running Rail] FIG. 5 is a front view of the running rail, FIG. 6 is a plan view thereof, and FIG. 7 is a side view thereof. In the drawing, a running rail 1 is formed of a long member having a predetermined length, and a rack 2 that meshes with a pinion on a main body side described later is provided on an upper surface thereof, and both side portions of the running rail 1 are shown in the figure. Thus, it is formed as a V-shaped cross section. Hooks 3 are attached to both ends of the traveling rail 1, and the traveling rail 1 can be lifted with a wire or the like when the traveling rail 1 is attached to the workpiece 100 using the hook 3. By connecting a wire to the workpiece 100
The traveling rail 1 can be prevented from falling from the vehicle. As shown in FIG. 7, a bracket 4 is attached to the lower surface of the rail 1 so as to be separated left and right by screws 4a, and a magnet 5 is attached to the bracket 4 so as to be swingable about a shaft 6. I have. A plurality of magnets 5 can be provided for each bracket 4 as needed. A release lever 7 is rotatably provided on the shaft 6. When the lever 7 is rotated counterclockwise from the state shown in FIG. 7, the magnet 5 is moved by the tip of the release lever 7 using the principle of leverage. 100
Can be removed from

The bracket 4 has a guide plate 8 for positioning an endless grinding belt of a grinding device to be described later.
The guide plate 8 is provided movably with respect to the bracket 4 using the elongated hole 9, and a butterfly for fixing the guide plate 8 through the elongated hole 9 of the guide plate 8. A bolt 10 a is screwed to the bracket 4, and a wing bolt 10 b for positioning the guide plate is screwed to the positioning piece 11.
The guide plate 8 is moved while the two wing bolts 10a and 10b are loosened, and the piece 11 of the wing bolt 10b is brought into contact with the bracket 4 in a state where the endless grinding belt described later is positioned by the tip of the guide plate 8. When the wing bolts 10b are brought into contact with each other and the wing bolts 10b are tightened in this state, the amount of projection of the guide plate thereafter can be constantly kept constant by the wing bolts 10b. Therefore, in the second and subsequent operations, the projecting amount of the guide plate 8 is defined by using the bridge 11 of the wing bolt 10b. The alignment of the grinding belt with the bead portion 101 can be easily performed.

FIG. 8 is a front sectional view of the main body, FIG. 9 is a plan view of the main body, and FIG. 10 is a side sectional view of the same. In FIG. 10, a pair of left and right wheel members 21 and 22 arranged in a V-shape for holding the traveling rail 1 is provided on the lower surface of the main body 20, and one wheel member 21 is appropriately fixed to the lower surface of the main body 20. Although it is fixed by means, the other wheel member 22 is slidably mounted on a bearing 23 provided on the main body 20. A slide knob 24 is rotatably provided on the wheel member 22.
The wheel member 22 can be fixed to the main body by being screwed into a screw hole 25 formed on the third side. Therefore, by operating the slide knob 23, the left and right wheel members 2
The main body 20 can be attached to the travel rail 1 via the wheel members 21 and 22 so that the main body 20 can be run through the wheel members 21 and 22.

As shown in FIG. 8, a support member 29 is provided on the upper surface of the main body 20 so as to be swingable about a bolt 30. The support member 29 has a feed motor 26 and a rotational force of the feed motor. Is transmitted to the pinion 27. The shaft 31 of the pinion 27 is rotatably supported by a support member 29 with respect to a support member 29. When the support member 29 swings around the bolt 30, the shaft 31 of the pinion 27 is formed on the main body 20. The inside of the hole 33 thus formed can be moved in a direction substantially perpendicular to the paper surface of FIG. The pinion 27 can be disengaged with the rack 2 on the traveling rail 1 by operating a clutch lever 41 to be described later.
When the feed motor 26 is operated while the rack 7 is engaged with the rack 2, the pinion 27 rotates through the gear mechanism 28, and the main body 20 runs on the running rail 1. The main body 20
Is provided with a stroke end switch 34 for detecting that the main body has reached the end of the running rail and shutting off the power.

Here, the feed motor 26, the pinion 2
8 and the relationship between the traveling rail 1 and the rack 2 are shown in FIG.
11 and FIG. 12 will be described in more detail. FIG. 11 is a plan view and a side view showing a state where the pinion 27 and the rack 2 are engaged with each other. FIG. 12 is a plan view showing a state where the pinion 27 and the rack 2 are separated from each other. It is a figure and a side view. A pair of arm members 35 and 36 are formed at an end (an end opposite to the bolt 30) of a support member 29 that supports the feed motor 26 and the pinion 27, and the like.
A guide roller 37 is disposed between the six rollers. An eccentric cam shaft 38 is rotatably mounted at the center of the guide roller 37 as shown in FIG. 8, and a ring 39 is rotatably fitted on the eccentric cam 38a of the cam shaft 38. 39 is fixed to the body cover 40 by screws 39a. Since the inner diameter is eccentric with respect to the outer diameter of the ring 39, when the ring 39 is fixed to the main body cover 40, the eccentric cam shaft 38 is rotated by rotating in the circumferential direction.
Of the rack 2 and the pinion 27 can be adjusted. Further, a clutch lever 41 is fixed to the upper end of the eccentric cam shaft 38,
A clutch knob 42 is provided at an end of the clutch lever 41.

In FIG. 12, when the clutch lever 41 is rotated counterclockwise by 180 °, the eccentric cam 38a of the eccentric cam shaft 38 is also rotated, whereby the support member 29 swings about the bolt 30 via the ring 39. The pinion 27 can be engaged with the rack 2 of the traveling rail 1 as shown in FIG. When the feed motor 26 is driven in this state, the pinion 27 rotates via the bevel gear mechanism 28, and the main body 20 can travel on the traveling rail 1 along the rack 2.

As shown in FIGS. 8 and 9, a main switch 43 and a power lamp 4 are provided on the upper surface of the main body cover 40.
4, an overload lamp 45 and a feed switch 46 are provided, and the details of these wiring circuits will be described later. 9 and 10, the arm member 4 is provided on one side of the main body cover 40.
7 and 48 are formed. A grinding device to be described later is swingably attached to the arm member 47 so that the grinding device can be fixed to the main body at a predetermined swing angle by a screw screwed to the arm member 48. Has become.

[Grinding Apparatus] FIG. 13 is a partially cutaway front view of the grinding apparatus, FIG. 14 is an enlarged view of a main part of the grinding apparatus, and FIG.
FIG. 4 is an explanatory diagram of a use state of the grinding device. In FIG. 13, a support member 61 of a grinding device 60 includes a support arm 62 and a first position adjusting device 63, and the support arm 62 is swingable by a shaft 64 on an arm member 47 formed on the body cover side. The first position adjusting device 63 is attached to the arm member 48 on the body cover side. A substantially arc-shaped hole 63a is formed in the first position adjusting device 63, and a tightening member 65 fixed to the arm 48 on the main body cover 40 penetrates the hole 63a.
Can be oscillated within the arc-shaped hole 63a of the first position adjusting device 63, and by operating the lever 66, the body cover 40 can be oscillated at a predetermined angle by the grinding device.
It can be fixed to the side. That is, when the lever 66 is loosened, the grinding device can swing about the shaft 64, and when the lever 66 is tightened, the grinding device can be fixed to the arm member 48 in a state where the grinding device is swung by a predetermined angle by the tightening member 65. Thus, the angle of the endless grinding belt 67 of the grinding device described later can be adjusted.

The grinding device comprises an endless grinding belt 67, a dust case (means for preventing scattering of grinding powder) 67a disposed behind the endless grinding belt 67, and a main motor 68 for driving the endless grinding belt 67. These are integrally attached to a support member 61 of the grinding device so as to be vertically swingable in FIG. 13 by a shaft 68a. The dust case 67a has a function of protecting and collecting the main body 20 from the grinding powder ground by the endless grinding belt 67, has a suitable shape, and is configured to be removable as needed. I have. In this embodiment, it can be easily removed by the wing bolt 67b. Alternatively, the structure may be such that the grinding powder is discharged only from the rear so as not to be scattered around. An endless grinding belt 67 is wound between a pulley 69 provided on the main motor 68 side and a pulley 71 provided at the end of a telescopic support arm 70, and between the two pulleys 69, 71. A tension spring 70a is disposed to prevent the endless grinding belt 67 from loosening.

The support arm 70 and the support member 6 of the grinding device
A second position adjusting device 72 that adjusts the position of the end of the endless grinding belt 67 is provided between the second position adjusting device 72 and the second position adjusting device 72. The second position adjusting device 72 includes a shaft 73 provided between the support arm 70 and the support member 61 of the grinding device.
The end of the endless grinding belt arranged on the outer periphery is
And a lift lever 75 for lifting the shaft 73 upward. A double nut 76 screwed to the shaft 73 connects the support arm 70 and the support member 61 of the grinding device. The distance can be adjusted. The lift lever 75 is not rotated by a pin 75a.

The endless grinding belt 67 can be pressed against the workpiece 100 with a predetermined pressing force by the urging force of the spring 74. When the lift lever 75 is swung about the upper part of the inclined surface of the support member 61 on which the shaft 73 is mounted as a fulcrum, the shaft 73 can be pulled up against the urging force of the spring 74 by the principle of leverage,
Thus, the workpiece 100 can be moved upward. This lift lever 75 is
At the initial stage of the grinding, the endless grinding belt 67 is lifted from the workpiece 100 by operating the lift lever 75 until the rotation of the endless grinding belt 67 reaches a predetermined speed and engaging the protrusion 61a formed on the support member 61. When a predetermined speed is reached, the lift lever 75 is released, and the endless grinding belt 67 is moved to the workpiece 10.
0, so that excessive load resistance acting on the endless grinding belt 67 at the beginning of grinding can be reduced.

A third position adjusting device 80 for adjusting the grinding depth of the endless grinding belt 67 is provided at the tip of the support arm 70. As shown in FIG. 14, the third position adjusting device 80 includes an idle pulley bracket 78 provided at the tip of the support arm 70 and an idle pulley 71 provided at the tip of the idle pulley bracket 78 so as to be rotatable. The roller brackets 78a, 78a to which the rollers 79, 79 are attached so as to be positioned near the idle pulley 71 are rotatably mounted with the bolt 81 as a fulcrum. Hexagon socket head bolts 82, 82 for adjusting the vertical position of the rollers 79, 79 are rotatably fixed to the roller bracket, and the idle pulley bracket 78 is rotated by turning the hexagon socket head bolt 82.
Roller 79 and idle pulley 7
1 can be changed. Therefore, as shown in FIG. 15A, when the hexagon socket head cap screw 82 is rotated by a tool, the position of the roller 79 moves up and down. If the position of the roller 79 is set to a predetermined position in advance, the endless grinding is performed. Workpiece 1 by belt 67
The situation where the 00 side is ground more deeply than necessary can be avoided. In FIG. 15, (b) shows the state in which the roller is lowered and the cutting depth by the endless grinding belt is adjusted to be shallow, and (c) shows the state in which the roller is raised and the cutting depth by the endless grinding belt is adjusted to be deep. It is a figure of a state. Workpiece 100 and Workpiece 1
If there is a butt difference of 00, the individual rollers 7
9, 79 can be adjusted by moving up and down.

[Control Circuit of Automatic Grinding Apparatus] FIG. 16 is a control circuit diagram of the automatic grinding apparatus, and FIG. 17 is a flowchart of the control circuit. In FIG. 16, reference numeral 43 denotes a main switch; 91, a main motor switch of the grinding device 60;
Is a feed motor switch of the main body 20 of the automatic grinding device;
Is a signal generating unit proportional to the current of the main motor, 93 is a normal load determining unit, 94 is a feed speed automatic setting control unit for making the load current of the main motor constant in a normal range,
Reference numeral 95 denotes an automatic feed speed control unit for suppressing an increase in the load current of the main motor in an excessive range. Reference numeral 96 denotes a firing angle control unit for a triac. The optimum feed speed of the automatic grinding device can be obtained, and an overload state of the grinding device is avoided.

If the main switch is turned on in step S1, the feed motor control circuit starts in step S2, and if the main motor switch is turned on in step S3, the main motor starts. On the other hand, after the main switch is turned on, the frequency of the power supply (50 Hertz or 60 Hertz) is determined in step S13. In step S14, the signal level correction circuit proportional to the current of the main motor performs step S4. Outputs a correction signal. When the feed motor switch is turned on in step S4, the feed motor starts. As a result, cutting is started in step S5. After the start of cutting, in step S6, a signal proportional to the current of the main motor is checked, and the feed speed is automatically controlled so that grinding can be performed within a certain current range.

In step S7, it is determined whether or not the grinding load is within a range in which the automatic control can be performed. If YES, the grinding is executed as it is. In the case of NO, the process proceeds to step S16 to perform switching of the constant interval mode at the time of overload, and further, in step S15, automatic control of the feed speed at constant intervals to suppress the increase in the load current of the main motor in the excess range. I do. Thus, in the automatic grinding apparatus, grinding is always performed with a load within a range that can be automatically controlled. When the main body 20 of the automatic grinding device travels on the traveling rail and the stroke end switch 34 is turned off, the feed motor is stopped in step S8, and the grinding is completed in step S9. Thereafter, the process proceeds to step S10, in which the feed switch is turned off, then, in step S11, the main motor switch is turned off, and further, in step S12, the main switch is turned off, and the operation is completed.

Next, the operation of the automatic grinding apparatus will be described. In order to grind the weld bead 101 of the iron plate reinforcing the pier or the like with the automatic grinding device, the welding bead portion 10 is used.
First, the running rail is attached along 1. The traveling rail is attached by adsorbing a magnet 5 provided on the lower surface of the traveling rail 1 to an iron plate. Since the magnet 5 can swing with respect to the bracket 4, the magnet 5 is arranged at right angles to the surface of the iron plate. And maintain strong adsorption holding power. With respect to the fixed traveling rail 1, the positions of the left and right wheel members 21 and 22 provided on the lower surface of the automatic grinding device 20 to which the grinding device 60 is attached are adjusted, and the traveling knob 1 is operated by operating the slide knob 24. It is sandwiched between the wheel members 21 and 22. At this time, when the rack 2 on the traveling rail 1 is engaged with the pinion 27 on the main body side by operating the clutch lever 41, the engagement between the pinion 27 and the rack 2 causes
The main body 20 of the automatic grinding device is held at a mounting position on the traveling rail.

On the other hand, in the grinding device 60, the first position adjusting device 63 is operated to swing the support portion 61 of the grinding device about the shaft 64, and the endless grinding belt 67 is moved substantially with respect to the workpiece 100. Adjust the position so that it is a right angle. Further, the distance between the support arm 70 supporting the endless grinding belt 67 and the support member 61 of the grinding device is adjusted by the second position adjusting device 72, and the grinding depth by the endless grinding belt 67 is further adjusted. Pulley 7 by the third position adjusting device for
1 and the rollers 79, 79 are individually adjusted. When the main body 20 and the grinding device 60 are attached to the traveling rail 1 as described above, the guide plate 8 provided on the bracket 4 on the traveling rail 1 side is connected to the wing bolts 10a, 10a.
b is moved in a loosened state, the tip of the guide plate is aligned with the endless grinding belt, the piece 11 of the wing bolt 10b is brought into contact with the bracket 4, and the wing bolt 10b is tightened in this state. Can always be made constant by the wing bolt 10b.

To operate the grinding device mounted on the traveling rail 1, the main switch 4 of the control circuit described above is used.
3 is turned on, and the main motor switch 91 is turned on.
When the switch 46 of the feed motor is turned ON, the feed of the main body 20 of the automatic grinding apparatus is performed according to the flowchart, and the bead 101 on the iron plate can be ground by the grinding apparatus 60. After the switch is turned on and before the main motor switch is turned on, the lift lever 75 is operated to move the endless grinding belt 67 to the workpiece 1.
When the endless grinding belt 67 is floated from above, excessive load resistance acting on the endless grinding belt 67 can be reduced until the rotation of the endless grinding belt 67 reaches a predetermined speed in the initial stage of grinding. Grinding powder generated during grinding is collected by a dust case.

The main body to which the grinding device is attached is a bead 101
When it comes to the end of the running rail while grinding, the grinding is finished and the stroke end switch 34 operates to cut off the power. Similarly, when performing the second and subsequent operations on the same pier, that is, when grinding the bead 101 at another location on the same pier, the protrusion amount is specified using the bridge of the wing bolt 10b. If the traveling rail is attached along the bead 101 using the guide plate 8 that is present, the positioning of the endless grinding belt of the grinding device thereafter can be easily performed.

As described above, according to the present automatic grinding apparatus, the bead 101 of the iron plate welded portion can be automatically ground at an appropriate feed speed. In addition to being very efficient, a more attractive grinding surface can be obtained. Also,
The rail and the main body can be assembled in various forms as long as they have the same function as the present apparatus. Also, the traveling mechanism of the automatic grinding device can use a belt or the like as necessary. Furthermore, the present invention may be embodied in various other forms without departing from its spirit or essential characteristics. In addition, the above-described embodiment is merely an example in all aspects, and should not be construed as limiting.

[0029]

As described in detail above, according to the present invention,
The grinding of the weld bead can be performed efficiently. Since it is lightweight and compact, it is excellent in portability, can be carried anywhere, and can be attached and detached by an automatic grinding device alone, thereby reducing the working time. By making the magnet adsorbed on the iron plate swingable, the magnet can be sufficiently firmly attached to the curved surface of the iron plate wound around the pier or the like. The bead grinding material is a belt system that can swing according to the curved surface, and a means for preventing the scattering of grinding powder is provided adjacent to this belt, so that the bead part can be ground accurately and the grinding powder during grinding is reduced. Since it can be prevented from being scattered around, the main body of the automatic grinding apparatus can be protected. Since the feed rate of the automatic grinding device can be adjusted according to the load at the time of grinding, it is possible to achieve excellent effects such as prevention of overload of the motor and the like.

[Brief description of the drawings]

FIG. 1 is a front view of an automatic grinding device according to an embodiment.

FIG. 2 is a side view of FIG. 2;

FIG. 3 is a view showing a state in which the automatic grinding device is attached around a pier or the like.

FIG. 4 is an explanatory view of attachment between a traveling rail and a main body in the automatic grinding device.

FIG. 5 is a front view of a traveling rail of the automatic grinding device.

FIG. 6 is a plan view of FIG. 5;

FIG. 7 is a side view of FIG.

FIG. 8 is a front sectional view of a main body of the automatic grinding device.

FIG. 9 is a plan view of FIG.

FIG. 10 is a side sectional view of a main body of the automatic grinding device.

11A and 11B are a plan view and a side view showing a state where the pinion 27 in the main body and the rack 2 are engaged with each other.

FIG. 12 is a plan view and a side view in a state where the pinion 27 and the rack 2 are separated from each other.

FIG. 13 is a partially broken front view of the grinding device of the automatic grinding device.

FIG. 14 is an enlarged view of a main part of the grinding device.

FIG. 15 is an explanatory diagram of a use state of the grinding device.

FIG. 16 is a control circuit diagram of the automatic grinding apparatus.

FIG. 17 is a flowchart of the control circuit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Running rail 2 Rack 3 Hook 4 Bracket 5 Magnet 7 Release lever 8 Guide plate 10 Wing bolt 11 Piece 20 Main body 21, 22 Wheel member 24 Slide knob 27 Pinion 28 Gear mechanism 29 Support member 35, 36 Arm member 37 Guide roller 38 Eccentricity Cam shaft 39 Ring 40 Body cover 41 Clutch lever 43 Main switch 46 Feed switch 47, 48 Arm member 60 Grinding device 61 Support member 63 First position adjusting device 65 Fastening member 66 Lever 67 Endless grinding belt 68 Main motor 69, 71 Pulley Reference Signs List 70 Support arm 70a Tension spring 72 Second position adjusting device 73 Shaft 74 Spring 75 Lift lever 78 Idle pulley bracket 79 Roller 80 Third position adjusting device 81 Hexagon socket head bolt Reference Signs List 91 Main motor switch 92 Signal generation unit proportional to main motor current 93 Normal load discrimination unit 94 Automatic feed speed setting control unit that keeps load current of main motor constant in normal range 95 Main motor in excess range Automatic feed speed setting control unit that suppresses the rise in load current of the 96. Triac firing angle control unit

Claims (6)

[Claims] 1. A traveling rail which can be detachably attached to a surface of a workpiece, a main body is provided on the traveling rail so as to be detachable and capable of traveling, and the main body is provided on the surface of the workpiece. A grinding device for grinding is provided swingably, the grinding device includes an endless grinding belt rotated by a main motor in the device, and the grinding belt and the workpiece are adjusted by a position adjustment device provided in the grinding device. An automatic grinding apparatus characterized in that it is configured to be able to adjust the position of the workpiece. 2. A position adjusting device comprising: a first position adjusting device for adjusting a swing angle of a grinding device; a second position adjusting device for adjusting a position of a grinding portion of an endless grinding belt in the grinding device;
The automatic grinding device according to claim 1, further comprising a third position adjusting device that adjusts a grinding depth of the endless grinding belt. 3. The automatic grinding apparatus according to claim 1, further comprising means for preventing scattering of grinding powder at the rear of the endless grinding belt in the direction in which the grinding progresses. 4. The main body has a pinion that meshes with a rack provided on a running rail, and the main body can run on the running rail by being rotated by a feed motor provided in the main body. The automatic grinding apparatus according to any one of claims 1 to 3, wherein: 5. The running rail according to claim 1, wherein a magnet is swingably provided on the running rail, and the running rail can be attached to a workpiece by a magnetic force of the magnet. Item 5. The automatic grinding device according to any one of Items 4. 6. The automatic grinding apparatus according to claim 1, wherein the main body is configured to adjust a feed rate according to a grinding load of the grinding apparatus.