JP3071780B1 - Upward grinding machine - Google Patents

Abstract

There is no grinder capable of grinding a wide area including a projection and a weld bead projecting from a lower surface of an object to be ground to smooth the surface. SOLUTION: A lower frame L located on a floor surface and an upper frame U which moves up and down on the lower frame L are provided.
A horizontally movable support shaft 18 is provided.
8 is provided with a support member 20 which moves in a direction intersecting with the movement direction of the support shaft 18, and it is possible to swing the distal end side of the support member 20 up and down by holding a grip portion 22 provided at an end portion. By providing the grinding tool G supported as possible, it is possible for an operator to smooth the surface of the workpiece while checking it visually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upward grinding machine for grinding a large steel plate structure, a projection projecting from a lower surface of a block, a weld bead, and the like to finish it on a smooth surface.

[0002]

2. Description of the Related Art Conventionally, when a large-sized structure is formed, a large-sized structure is formed by manufacturing components sized to enable machining or the like and assembling the respective components. . As means for transporting such components,
As shown in a perspective view of a suspended state showing an example of an object to be ground in FIG.
Means of lifting these hanging pieces 52 by wires 53 and transporting them by a crane 54 or the like is generally employed. As the hanging piece 52, one having a shape as shown in the perspective view of FIG. 4B is known, and such a hanging piece 52 is fixed to the component 51 by welding 55. After the component 52 is transported to a predetermined position, the suspension piece 52 is a perspective view of the suspension piece after fusing shown in FIG.
As shown in the cross-sectional view of the hanging piece after fusing, gas is blown at the base. In addition, when such components 51 are integrated to form a large-sized structure, generally, as shown in a cross-sectional view showing an example of a welding connection in FIG.
Are joined together by welding 56 to be integrated.

However, as shown in FIGS. 4 (c) and 4 (d), the base of the suspended piece 52, which has been blown by gas, remains as a protrusion on the surface of the structure and is welded as shown in FIG. A weld bead also remains between the joined components, protruding from the surface. If such protrusions or weld beads (hereinafter, collectively referred to as “protrusions etc. P”) remain on the surface of the structure, the appearance of the structure may be impaired, or the structure of a structure navigating underwater like a hull may be used. In such a case, since the resistance becomes large, such protrusions P are removed by grinding so that the surface becomes smooth.

Further, such projections P may be located on the lower surface of the structure, and if the structure cannot be turned over, as shown in FIG. The protrusions P on the lower surface of the structure have to be ground from between. As described above, when grinding a projection or the like from the lower surface of the structure, the grinding is performed upward from a limited space, so that the burden on the operator is large and heavy labor is required. In particular, large structures such as hulls are extremely labor intensive due to many grinding points. In addition, a large amount of work time is required, which increases the time and cost required for manufacturing.

As a conventional technique for grinding the lower surface of such a structure, there is, for example, an invention described in Japanese Patent Application Laid-Open No. 8-294854. According to the present invention, as a device for grinding a reverse bead of an object to be welded, a guide truck traveling along a welding direction and a grinding tool mounted on the guide truck so as to be able to move up and down are provided. The welding bead is ground by the grinding tool by raising and lowering the position adjusting table moved by the position adjusting device provided in the apparatus by the elevating device (conventional example 1).

[0006] Another conventional technique is disclosed in
There is an invention described in JP-A-97448. In the present invention, the variable tilt angle table is moved by the slider that moves back and forth,
The grinder attached to the variable tilt angle table is moved up and down by a jack, and the grinder is pressed against a workpiece by a spring to grind upward (conventional example 2).

[0007]

As described above, when the protrusions P projecting from the surface of the structure are ground to smooth the surface of the structure, a portion of the protrusions P that largely protrudes is removed. In general, a method of pressing with a strong force when grinding and pressing with a weak force when the protrusion amount is small, and finishing a smooth surface while grinding a large area so as to be continuous with the periphery of the projection P etc. are generally adopted. You. Therefore, for example, the protrusions P shown in FIG.
If it is 0 mm, the protrusions P
By grinding about 80 mm in width and 550 mm in length around the center, a clean smooth surface is obtained.

[0008] In addition, the judgment of the smoothness when grinding the projections P is often performed by a person visually or by touch, and the degree of sensation is high, and the judgment is made based on the operator's experience. ing.

[0009] However, in the conventional example 1, since the welding bead is ground by the grinding tool while detecting the welding bead by the position detector and moving the guide trolley along the welding direction, the projection as described above is used. It is difficult to grind an object or the like to obtain a smooth surface that is continuous with the surface of the structure.
In addition, it is not possible to arbitrarily adjust the pressing force of the portion to be ground by the grinding tool.

Further, in the conventional example 2, the operator can proceed with the work while visually confirming the state in which the pressing force against the welding bead is adjusted. Therefore, even if the circular grinder grindstone is moved in contact with the grinding part, the grinding part is ground in a state close to the point, so it can be ground only linearly. . For this reason, as described above, the predetermined width including the protrusions and the like cannot be ground smoothly.

Further, in these conventional examples, grinding is difficult unless the floor surface and the object to be ground are parallel to each other. In addition, it is difficult to carry the work with the grinding tool at an arbitrary position.

[0012]

In order to solve the above-mentioned problems, the present invention provides a lower frame and an upper frame that moves up and down on the lower frame, and the upper frame is movable horizontally. The moving member is provided with a supporting member that moves in a direction intersecting with the moving direction of the moving member. provided with a supporting the grinding tool to be able to swing, the distance from the support member to the grip portion, the grinding tool is supported by greater than a distance from the support member to the tip of the grinding tool, the Connect the upper frame to the lower fixed upper frame and the upper
It consists of a rotating upper frame and a rotating upper frame rotating on a fixed upper frame.
We support as much as possible.

According to the grinding tool provided on the upper frame ascending and descending on the lower frame as described above, the distance between the grinding tool and the object to be ground is adjusted by raising the upper frame below the object to be ground. It is possible to grind a wide range of the object to be ground while moving it in the moving direction of the moving member and the moving direction of the support member by holding the gripping portion of the tool, so that the surface of the object to be ground can be smoothened while visually observing the surface. it can. In addition, since the operator grips the gripper of the grinding tool while checking it visually and swings the tip side up and down to grind, the grinding according to the operator's experience while looking over a wide area including protrusions etc. from the side Work can be done.

In addition, since the upper frame is composed of a lower fixed upper frame and an upper rotating upper frame, and the rotating upper frame is supported on the fixed upper frame so as to be pivotable, the upper frame is ground on the lower frame. By turning the tool, the grinding operation can be performed from different angles.

[0015]

[0016]

Further, the distance from the support member to the grip portion is
By supporting the grinding tool with a distance greater than the distance from the support member to the tip of the grinding tool, a grinding operation with a large pressing force can be performed with a small force using the principle of leverage.

Further, if the moving member is provided with a reaction force buffering mechanism for receiving the grinding reaction force of the grinding tool acting on the support member moving in the axial direction of the moving member, a large grinding reaction force is applied to the grinding tool during grinding. Even if it acts, it can be prevented from being received by the reaction force buffer mechanism and transmitted to the moving member side.

In addition, if the grinding tool is rotatably supported on the support member, the grinding tool can be turned by rotating the support member to perform a grinding operation.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a drawing showing a first embodiment of an upward grinding machine of the present invention, where (a) is an overall perspective view,
(b) is a perspective view of a grinding tool and the like. 2 is a side view of the upward grinding machine shown in FIG. 1, (a) is an overall side view, and (b) is a side view for explaining operation.

As shown in FIGS. 1 and 2, the upward grinding machine M₁To
Is a lower frame L located on the floor B, and on the lower frame L
An upper frame U that moves up and down is provided.
The frame U is linked by a link mechanism C provided between the frame U and the lower frame L.
It is configured to be able to move up and down. This link mechanism C has a width
Crosslins provided in the direction (lower left-upper right in FIG. 1)
Of the link members 1.
One (upper left of FIG. 1 in this example) is a lower frame L and an upper frame U
And the other (in this example, the lower right side of FIG. 1).
Is provided with wheels 3. The moving position of this wheel 3
Receiving materials 4 and 5 are formed. Also, left and right link members
1 has a central part and a lower part which are connected by connecting members 6 and 7.
Brackets 6a, 7a provided on both connecting members 6, 7
A jack 8 for driving up and down is provided between them. This resource
The lift by the link mechanism C is provided on one of the lower frames L.
When the operator operates the pedal 9, the control pipe 10 is moved.
By expanding and contracting the jack 8 connected via
Controlled. In this embodiment, the upward grinding machine M₁
So that workers can move the whole
In addition, wheels 11 are provided at four corners on the lower surface of the lower frame L.
12a is an upward grinding machine M ₁When moving the handle 1
2 (Fig. 2 (a)).
You.

The upper frame U is provided with a lower fixed upper frame U.₁
And upper rotating upper frame U_TwoIt consists of a rotating upper part
Frame U_TwoIs fixed by the support pin 13 which is the center of rotation.
Frame U ₁Supported above. Therefore, the rotating upper frame U_TwoIs
It is rotatable around the support pin 13.

The rotating upper frame U ₂ is provided with a base frame 14 that rotates in contact with the fixed upper frame U ₁ and a grinding tool holding frame 15 that is separated from the base frame 14 by a predetermined distance. I have. The grinding tool holding frame 15 is provided with guide rails 16 below the left and right frame members. The guide rails 16 extend along the guide rails 16 together with a support shaft 18 serving as a moving member for connecting the left and right guide members 17. Grinding tool G is provided. As the grinding tool G, an electric grinding tool (a grinder) having a rotating grindstone 19 on the tip side (upper left side in FIG. 1) is employed.

The back side of the grinding tool G is supported by the support shaft 18 so that the grindstone surface faces upward, and a support member 20 (a ball bush as a “rolling guide”) provided on the back surface of the grinding tool G is provided. Support shaft 18
Is slidable in the width direction. Since the outer periphery of the support shaft 18 and the inner periphery of the support member 20 are circular, the support member 20 is slidable in the width direction and rotatable in the circumferential direction.

In this example, a guide member 21 is provided on the side of the grinding tool of the support member 20, and the operator holds the grip 22 of the grinding tool G and the grip 23 of the guide member 21 with both hands. It is configured to perform grinding work. Note that the grinding tool holding frame 15 on the side where the work is performed while holding the grips 22 and 23 is formed in a downward concave shape so that the grips 22 and 23 can be easily operated.

Therefore, the grinding tool G in this embodiment is
As shown in FIG. 1 (b), the gripper 22 provided at the rear end (lower right in FIG. 1) of the grinding tool G is moved up and down so that the tip side of the grinding tool G is swung in the vertical direction z. It can be moved and can move in the left-right direction x along the support shaft 18 and the front-rear direction y along the guide rail 16.

Further, in this embodiment, since the grinding tool G that rotates left in a plan view is used, the grinding tool G receives a lateral movement when a large grinding reaction force acts on the grinding tool G at the time of grinding, thereby cushioning an impact or the like. A reaction force buffering mechanism S is provided. In this example, the reaction force buffering mechanism S is configured by providing the coil spring 24 on the reaction force acting side of the support shaft 18, and the support member 20 contacts the coil spring 24 even when the grinding tool G moves in the lateral direction. Shock can be buffered.

Further, fixed point holding members 25 are provided at the four corners of the grinding tool holding frame 15 so as to protrude upward from the upper portion of the grinding tool holding frame 15 by a predetermined amount. The fixed point holding member 25 has a height at which a predetermined space can be created between the workpiece O and the grinding tool G by raising the upper frame U ₂ and bringing the upper frame U ₂ into contact with the lower surface of the workpiece O. It is provided in. This fixed point holding member 25 allows the upward grinding machine M
₁ can be fixed in place. Furthermore, the fixed point holding member 25 can be individually height-adjusted by loosening the fixing nut 25a, and can be individually adjusted even when the floor B and the workpiece O are not parallel. All the fixed point holding members 25 can be fixed by contacting the lower surface of the workpiece O. In this embodiment, the upper frame U
Fixed point holding member 2 facing upward from the bottom toward the lower surface of the workpiece O
5, the lifting jack (a jack whose height can be adjusted so as to float the wheels) downward from the lower frame L toward the floor B may be provided.

According to upward grinder M ₁ of the first embodiment constructed as described above, FIG. 2 (a), the (b), the object to be ground the upward grinding machine M ₁ O With it positioned below
When the operator operates the pedal 9, the link mechanism C
Raising the upper frame U stretched out to secure the upward grinder M ₁ to a predetermined position by pressing the fixed point maintenance member 25 to the object to be ground O. At this time, if the floor B and the object O are parallel, the fixed-point holding members 25 at the four corners may have the same height, but if the floor is inclined, the heights of the fixed-point holding members 25 at the four corners are adjusted. To follow the slope.

In this state where the fixed point is held, the gripping portion 22 of the grinding tool G and the gripping portion 23 of the guide member 21 are held with both hands H, and the rotating grindstone 19 is pressed against the projection P or the like to perform grinding. I do. At this time, the grinding is performed while moving the grinding tool G back and forth and right and left while adjusting the force (the force to swing in the vertical direction z) of pressing the rotating grindstone 19 against the projections P etc. according to the judgment of the worker. Can be formed, so that protrusions such as P
And its surroundings can be ground smoothly. Also, if a large excavating reaction force is applied by pressing with a large force,
Even if it acts as a lateral force, since the support member 20 is received by the coil spring 24, the grinding operation can be continued without receiving an impact. In addition, since the worker can perform the work while looking in from the side, the work posture is improved, and the continuous work is also possible, and the smooth surface can be efficiently finished in a short time. Compared to the case where the protrusion is ground in the above-described range of the width of 80 mm and the length of 550 mm, this efficiency improvement is reduced by about 180 minutes in the manual operation of the operator to 40 minutes, and about 1 / 4.5.
The work will be completed in time.

Further, it is difficult to grind the projections P etc. so as to be continuous with the surface of the object O to be ground by changing the direction of the grinding tool G. It is necessary to change the direction of the grinding tool G. This change work is performed by lowering the upper frame U once, and
Is released, and the upper frame U ₂ is rotated about the support pin 13 (two-dot chain line in FIG. 1A), and the upper frame U is again rotated.
It was allowed to rise to fixed while changing the direction of only the rotating upper frame U ₂ by abutting the fixed point holding member 25 to the object to be ground O. Thereafter, if the grinding operation is performed with the grinding tool G and the grip portions 22 and 23 of the guide member 21 as described above, grinding from different angles can be easily performed. As described above, not only the position of the protrusions P, but also the periphery of the protrusions P, the grinding can be performed while changing the grinding angle. Even if it is ground, a wide range can be ground to smooth the surface of the workpiece O. In addition, since the operator can perform the adjustment while adjusting the force, it is possible to easily perform the grinding operation according to the grinding situation.

FIGS. 3A and 3B show a second embodiment of the upward grinding machine of the present invention. FIG. 3A is an overall perspective view, and FIG. 3B is a perspective view of a grinding tool. In the second embodiment, in addition to the movement of the grinding tool in the above-described first embodiment, only the grinding tool can be rotated. The same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

As shown, in the second embodiment,
Guide rails 16 on the upper side of the frame member which is located on the left and right of the grinding tool holding frame 15 provided on the rotating upper frame U ₂ of the upper is provided which constitutes an upper frame U, to the guide rail 16,
The support shaft 1 as a moving member for connecting the left and right guide members 17
A grinding tool G running along the guide rail 16 together with the guide rail 16 is provided. This grinding tool G also has a rotary grindstone 19 on the tip side (upper left side in FIG. 3), and the back side is supported so that the grindstone surface faces upward. In this embodiment, a support member 20 (ball bush) slidable in the width direction is provided on the support shaft 18, and a support rotatably supported by a pin 26 is provided above the support member 20. A plate 27 is provided. The outer periphery of the support shaft 18 and the inner periphery of the support member 20 are also circular, and the support member 20 is slidable in the width direction and rotatable in the circumferential direction. Also, the support plate 27
Is rotatable about the pin 26 on the support member 20.

Further, in this embodiment, the support plate 27 and the grinding tool G are connected by a support spring 28. Two support springs 28 are provided in the width direction of the grinding tool G, and the upper end is attached to the grinding tool G and the lower end is attached to the support plate 27. It is elastically supported.

Accordingly, the upward grinding machine M of the second embodiment
According to the grinding tool G in FIG. ₂ , as shown in FIG.
Gripping part 22 provided at the rear end of grinding tool G (lower right in FIG. 3)
, The tip side of the grinding tool G can be swung in the up-down direction z, and the movement in the left-right direction x along the support shaft 18, the front-back direction y along the guide rail 16, The rotation v around the center 26 and the elastic support w of the grinding tool G by the support spring 28 are possible.

According to the upward grinding machine M ₂ of the second embodiment configured as described above, the upward grinding machine M ₂ is placed below the workpiece O as in the first embodiment. in a state of being positioned to press the fixed point holding member 25 of the upper frame U to object to be ground O stretch the link mechanism C by extending the jack 8 with pedal 9, fixing the upward grinder M ₂ in a predetermined position (Similar to FIG. 2). At this time, if the floor B and the object O are inclined, the height of the fixed point holding member 25 at the four corners is adjusted so as to follow the inclined surface.

With the fixed point held in this way, the gripping portion 22 of the grinding tool G and the gripping portion 23 of the guide member 21 are held, and the projections P and the like are ground by the rotating grindstone 19. At this time, it is possible to perform the grinding while moving the grinding tool G back and forth, right and left while adjusting the pressing force of the rotating grindstone 19 against the projections P, etc., by the judgment of the operator. It can be ground smoothly including the periphery.

Further, since the grinding tool G is supported via the support spring 28, the grinding tool G is elastically supported on the support plate 27 even if the grindstone is pressed against the projection P by a large force. Therefore, the reaction force can be buffered without being directly transmitted to the support member 20. This enables a stable continuous operation. Moreover, since the worker can perform the work while looking into it from the side, continuous work becomes possible and the work can be performed efficiently.

Further, in this embodiment, when it is desired to grind the grinding tool G in a different direction, the upper portion can be rotated from the support plate 27 by holding the gripping portions 22 and 23, so that the projections can be formed from various angles. It is possible to easily and effectively grind the periphery including the object P, and to smoothly grind the surface of the object O.

Further, even if the grinding tool G moves laterally with the support member 20 due to the grinding reaction force, the impact can be buffered by the coil spring 24.

In Embodiments 1 and 2 described above, a grinder is used as an example of the grinding tool G. However, the present invention is not limited to the grinder, and another configuration may be used.
Further, the configurations in these embodiments may be appropriately combined according to use conditions and the like.

Furthermore, the above-described embodiment is one embodiment, and various changes can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

[0043]

The present invention is embodied in the form described above and has the following effects.

Since the operator can judge and perform the grinding operation while looking into a wide area including the projections on the lower surface of the structure from the side, the working efficiency can be greatly improved. In addition, continuous work can be performed by improving the work posture of the worker, and work time can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a drawing showing a first embodiment of an upward grinding machine of the present invention, wherein (a) is an overall perspective view and (b) is a perspective view of a grinding tool and the like.

FIGS. 2A and 2B are side views of the upward grinding machine shown in FIG. 1, wherein FIG. 2A is an overall side view and FIG.

3A and 3B are drawings showing a second embodiment of the upward grinding machine of the present invention, wherein FIG. 3A is an overall perspective view, and FIG. 3B is a perspective view of a grinding tool and the like.

FIG. 4 is a view showing an example of a workpiece to be ground by the upward grinding machine of the present invention, wherein (a) is a perspective view in a suspended state, and (b)
3 is a perspective view of the hanging piece, (c) is a perspective view of the hanging piece after fusing, and (d) is a cross-sectional view of the hanging piece after fusing.

FIG. 5 is a cross-sectional view showing an example of a conventional welding connection.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Link member 2 ... Axle 3 ... Wheels 4,5 ... Receiving material 6,7 ... Connecting material 6a, 7a ... Bracket 8 ... Jack 9 ... Pedal 10 ... Control tube 11 ... Wheel 12 ... Handle 13 ... Support pin 14 ... Base Frame 15 ... Grinding tool holding frame 16 ... Guide rail 17 ... Guide member 18 ... Support shaft 19 ... Rotating grindstone 20 ... Support member 21 ... Guide member 22,23 ... Grip part 24 ... Coil spring 25 ... Fixed point holding member 25a ... Fixed nut 26 ... pin 27 ... support plate 28 ... supporting spring U ... upper frame U ₁ ... fixed upper frame U ₂ ... rotating upper frame L ... lower frame B ... floor C ... link mechanism G ... grinding tool O ... object to be ground P ... projections, etc. S ... reaction force buffering mechanism v ... rotation w ... elastic support x ... lateral direction y ... longitudinal direction z ... vertical direction M _1, M ₂ ... upward grinder

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Ishida 3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP-A-4-322962 (JP, A JP-A-7-256546 (JP, A) JP-A-7-116956 (JP, A) JP-A-8-294854 (JP, A) Fully open Hei 6-80545 (JP, U) Really open Showa 63- 97448 (JP, U) Fully open 1987-78254 (JP, U) Fully open 51-81494 (JP, U) Fully open 50-91894 (JP, U) Fully open 1-106155 (JP, U) JP-B-49-22031 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24B 27/00

Claims (3)

(57) [Claims] 1. A lower frame, an upper frame that moves up and down on the lower frame, a moving member that is movable in a horizontal direction is provided on the upper frame, and a moving direction of the moving member is Providing a supporting member that moves in the crossing direction, and providing the supporting member with a grinding tool that has a gripping portion provided at the end portion and that is supported so that the tip side can swing up and down,
The distance from the support member to the grip portion is made larger than the distance from the support member to the tip of the grinding tool to support the grinding tool, and the upper frame is divided into a lower fixed upper frame and an upper rotating upper frame.
And the rotatable upper frame can be pivoted on the fixed upper frame.
Upward grinding machine, characterized by being held. To 2. A moving member, on the claim 1 Symbol mounting, characterized in that a reaction force buffering mechanism for receiving a grinding reaction force of the grinding tool which acts on the supporting member moving in the axial direction of said moving member Direction grinding machine. 3. A grinding tool and upward grinding machine according to claim 1 or claim 2 Symbol mounting characterized by being rotatably supported on the support member.