JP5637597B2 - Tank drilling device - Google Patents

Description

  The present invention relates to a tank drilling device formed in a hole for attaching various parts such as a gauge and a sensor to a tank, particularly a vehicle fuel tank.

  When forming holes for attaching various parts such as gauges and sensors in tanks, especially fuel tanks for vehicles, in order to prevent cut pieces from falling into the tank and becoming dirty, at the end of drilling work, It is desired to perform a drilling operation so that the cut piece is taken out of the tank.

As a tank drilling device that enables removal of a cut piece, for example, a tank drilling device shown in Patent Document 1 is known. The tank drilling device has a drill unit that opens holes for mounting various parts at predetermined locations of the tank, a cutter blade is mounted at a predetermined distance around the spindle as a center of rotation, and a lower portion of the spindle. It consists of a piston that moves up and down along the axis of the spindle, a piston rod fixed to the lower part of the piston, and a plurality of arms that are pivoted downward and equidistantly to surround the piston rod. A projection is provided on the inner side in the vicinity of the pivotally attached portion, and a lower end portion of the arm is provided on the outer side to form a claw portion. Further, a cam groove is provided in the piston rod so that the projection portion of the arm Engaging with the cam groove, the protrusion of the arm is pushed up or down by the vertical movement of the piston, and an expansion mechanism portion is provided in which the lower end of the arm is reduced or expanded, A cutter that inserts and expands an expansion mechanism portion into a lower hole that is opened at a predetermined position of the tank, expands the expansion mechanism portion, supports the lower surface portion of the lower hole, and rotates integrally with the spindle. The blade is brought into contact with the surface of the tank to open a hole having a predetermined diameter, and the cutting piece cut out by the cutter blade is held by the expansion mechanism.

  In the expansion mechanism part in the conventional tank drilling device described above, a cylinder constituted by a piston and a piston rod for expanding or reducing the diameter of the arm supporting the lower surface part of the pilot hole is provided and loosely fitted to the spindle. It is configured to operate by supplying compressed air from the formed air pipe.

However, in the drilling device, the structure of the expansion mechanism is complicated and enlarged, so that the hole can be formed only in a tank in which a pilot hole of a certain size is formed. . That is, when a small-diameter hole is formed in the tank, the pilot hole also has a small diameter according to the hole to be formed, and in an enlarged expansion mechanism portion, the small-diameter hole is inserted and penetrated. It was difficult to form a hole having a desired size.

Further, the air pipe of the expansion mechanism portion needs to be configured to be loosely fitted to the spindle and not to rotate when the spindle rotates. For this reason, the expansion mechanism part of the drilling device gives rotational resistance by inserting the arm into the pilot hole of the tank and penetrating the arm and expanding the arm to support the lower surface part of the pilot hole. Even if the spindle is rotated and the drilling operation is executed, the air pipe is not rotated.

For this reason, prior to forming a hole in the tank, it is necessary to perform an insertion operation of the expansion mechanism portion with respect to the pilot hole and a support operation to expand the arm to support the lower surface portion, and it takes time for the hole formation work, The formation efficiency of the pilot hole was bad.

Japanese Patent No. 3618693

  The problem to be solved is that the expansion mechanism part of the conventional drilling device requires an operating member such as a cylinder for expanding the arm diameter, so that the expansion mechanism part becomes complicated and large. It is difficult to form a small-diameter hole. Further, when the hole is formed by the rotating cutter blade, it is necessary to prevent the expansion mechanism portion from rotating with respect to the spindle of the drill unit, and the arm of the expansion mechanism portion is attached to the periphery of the pilot hole prior to the hole formation. It must be supported on the lower surface, and it takes time to form the holes, resulting in poor work efficiency.

  According to the present invention, a tank drill is formed by rotating a cutting blade provided at a required distance in the direction orthogonal to the axis from the axis of a spindle to be rotated to form a hole in a tank component mounting portion. In the apparatus, a base end portion is rotatably supported with respect to a shaft end portion of the spindle, and a pair of arm portions each having a gap extending in a direction coinciding with the axis is formed. A shaft support hole extending in a direction coinciding with the axis is formed in the arm, and a center shaft body having an outer diameter that can be inserted into a pilot hole formed in the center of the component mounting portion, and the shaft support A shaft member that is supported by the hole so as to be slidable in the axial direction; and an abutting member that is supported so as to be movable in the axial direction with respect to the central shaft body and to which the shaft end portion of the shaft member is fixed. Urging the contact member toward the distal end side of the central shaft body The elastic member and the central shaft body are arranged symmetrically in the space between the central shaft body, a cam hole is formed at one end portion for sliding contact with the shaft member, and a claw portion is provided at the other end portion. It is most important to have at least a pair of left and right support arms that are slidably supported between the reduced diameter side located inside the outer imaginary line of the body and the enlarged diameter side located outside the imaginary outer line. Features.

  The present invention can hold the cut piece by gradually increasing the diameter of the support arm as the cutting progresses without providing an operating member such as a cylinder, thereby simplifying the structure and reducing the size. it can. Further, along with the formation of the hole by the rotating cutting blade, the peripheral edge of the pilot hole can be supported by the support arm to hold the cut piece, and the working efficiency can be improved by shortening the time for forming the hole.

It is a fragmentary perspective view which shows the components attachment part of the tank in which a hole is formed with a tank drilling apparatus. It is a whole perspective view showing the outline of the tank drilling device concerning the present invention. It is a front view of a tank drilling device. It is a center longitudinal cross-sectional view of a tank drilling apparatus. It is a general body exploded perspective view of a tank drilling device. It is explanatory drawing which shows a tank drilling initial state. It is explanatory drawing which shows the state in the middle of tank drilling. It is explanatory drawing which shows the state at the time of completion | finish of tank drilling. It is explanatory drawing which shows the state which set the tank drilling apparatus to the removal jig | tool. It is explanatory drawing which shows the state which removed the cutting piece.

  According to the present invention, when the center shaft body is inserted into a pilot hole formed in the center of the component mounting portion in advance and the contact member is in contact with the upper surface of the pilot hole, the cutting edge of the cutting blade is placed on the upper surface of the component mounting portion. After the contact, the contact member is gradually moved toward the proximal end portion of the central shaft body against the elastic force of the first elastic member as the cutting of the component mounting portion by the cutting blade progresses. As a result, each support arm is rocked by a shaft member that slides from one end side to the other end side of the cam hole, and the claw portion that gradually moves from the reduced diameter side to the enlarged diameter side is engaged with the periphery of the prepared hole and cut. The best mode is to hold the cut pieces.

The present invention will be described below with reference to the drawings showing examples.
First, a description will be given of a vehicle fuel tank 5 as a tank provided with a component mounting portion 3 drilled by a tank drilling device 1 according to the present invention. As shown in FIG. 1, the vehicle fuel tank 5 is different. It is made of a synthetic resin in which a plurality of synthetic resin sheets are laminated, and on its upper surface, a number of component mounting portions corresponding to various components such as gauges, various sensors, fuel pumps, etc. mounted on the vehicle fuel tank 5 3 is formed.

The component mounting portion 3 is composed of a cylindrical portion 3c having a required outer diameter and height, a male screw 3a being turned on the outer peripheral surface, and an upper surface being closed by a closing plate 3b. The central portion of the closing plate 3b is provided with a recess 3e having a required depth and in which a pilot hole 3d having a required inner diameter is formed in the central portion in advance. And the opening 7 as a hole is formed by cut | disconnecting the said closing plate 3b along the internal peripheral surface of the cylindrical part 3c. The recess 3e is set to a depth at which the cutting edge of the cutting blade 17 contacts the upper surface of the closing plate 3b when the lower surface of a contact ring 25 described later contacts the upper surface of the recess 3e.
As shown in FIGS. 2 to 5, the tank drilling device 1 for forming the opening 7 in the closing plate 3b is, for example, an arm of an industrial robot that is controlled to move in at least a three-dimensional direction (none is shown). An opening 7 is automatically formed by attaching and controlling the movement of the arm.

  A spindle 9 is rotatably supported on a main body (not shown) of the tank drilling device 1, and a rotary shaft of an electric motor 11 provided on the main body is drivingly connected to the spindle 9. The spindle 9 is rotated at a required number of rotations by driving the electric motor 11.

  A rotating body 13 is fixed to the spindle 9, and the rotating body 13 is provided with a blade attachment arm 15 that extends in the radial direction with the spindle 9 as a rotation center. A cutting blade 17 that extends downward in the figure and coincides with the axis of the spindle 9 and has a blade edge of both blades or a single blade is attached to the tip of the blade mounting arm 15.

  A balancer member 19 is attached to the rotating body 13 on the side opposite to the blade mounting arm 15 and is adjusted so that the weight on the side opposite to the blade mounting arm 15 side coincides with the spindle 9 as a center.

  At the central portion of the rotating body 13, a base end portion of a central shaft body 19 having an axis that coincides with the spindle 9 is provided with a bearing 21 and is rotatably supported. As the bearing 21, an angular bearing that receives loads in both the thrust direction and the radial direction is suitable.

The central shaft body 19 has an outer diameter that can be inserted at least at the distal end side so as to coincide with the inner diameter of the pilot hole 3d. A bifurcated arm portion 19 a having a gap 23 extending in the axial direction is formed at an axially intermediate portion of the central shaft body 19. Each arm portion 19a is formed with a shaft support hole 19b whose axial direction is longer than the thickness of the vehicle fuel tank 5.

  A contact ring 25 constituting an outer diameter contact member that fits into the recess 3e is supported on the central shaft body 19 so as to slide in the axial direction. The shaft end portion of the slide shaft 27 as a shaft member that slides in the 19b is fixed. That is, the contact ring 25 is supported so as to move in the vertical direction shown in the figure with the axial length of the shaft support hole 19 b with respect to the central shaft body 19. Further, a first compression spring 29 constituting a first elastic member is attached to the central shaft body 19 between the rotating body 13 and the contact ring 25, and the contact ring 25 is attached by the elastic force of the compression spring 27. It is biased downward as shown.

  A pair of left and right support arms 31 are arranged symmetrically in the gap 23 of the central shaft body 19, and each support arm 31 is provided on the arm portion 19 a with an axis in a direction perpendicular to the axis. It is supported so as to swing around the shaft 33. A cam hole 31a is formed in the upper end portion of each support arm 31 shown in the figure, and the slide shaft 27 is inserted into each cam hole 31a so as to be in sliding contact therewith. In addition, a claw portion 31b having a large number of concavo-convex portions is formed at the lower end portion of each support arm 31 shown in the figure.

Each support arm 31 has a slide shaft 27 located at a lower end portion of the shaft support hole 19b illustrated in the cam hole 31a by a contact ring 25 that moves the claw portion 29b in the axial direction with respect to the central shaft body 19. Of the shaft shaft 19 is assumed to coincide with the outer diameter of the central shaft body 19 and the slide shaft 27 located at the upper end portion of the shaft support hole 19b. When the is positioned at the upper portion of the cam hole 31a shown in the figure, it swings between the enlarged diameter position outside the imaginary outer diameter line.

In addition, the code | symbol 31c in a figure is an internal diameter according to the amount of rocking | fluctuation of the support arm 31, and is a through-hole by which the axis | shaft 33 is loosely fitted.

  The contact ring 25 is formed with a plurality of through holes 25a penetrating in a radial direction perpendicular to the axis of the central shaft body 19 at equal intervals in the circumferential direction. The pin 35 is supported to move in the radial direction. Each engagement pin 35 is urged so that the tip portion protrudes toward the central shaft body 19 by the spring force of the second compression spring 37 that constitutes the second elastic member, and the slide shaft 27 is inserted into the shaft support hole 19b. When the contact ring 25 is moved so as to be positioned at the upper portion shown in the figure, the distal end portion of each engagement pin 35 is engaged with the recess portion 19c formed on the outer peripheral surface of the central shaft body 19 corresponding to the position. Thus, the moving state of the contact ring 25 is maintained. The illustrated recess 19 c is a stepped recess formed in the circumferential direction of the outer peripheral surface of the central shaft body 19, but may be a recess formed in the outer peripheral surface of the central shaft body 19 facing the tip of the engagement pin 35. .

Next, the operation of forming the opening 7 by the tank punching device 1 configured as described above will be described.
First of all, the initial state of the tank drilling device 1 will be described. The contact ring 25 against the central shaft body 19 has the slide shaft 27 at the tip of the shaft support hole 19b by the spring force of the first compression spring 29. Moved to position. In this state, the slide shaft 27 is positioned on the lower side (the distal end side of the central shaft body 19) of each cam hole 31a in the figure, so that each support arm 31 has its respective claw portion 31b having an outer diameter of the central shaft body 19. It is moved so as to be located at the reduced diameter position inside the imaginary line.

  Next, in order to form the opening 7 in the closing plate 3b in the component mounting portion 3 by the tank drilling device 1 described above, the tank drilling device 1 is moved to the central shaft body 19 by controlling the movement of the arm of the work robot. The distal end portion is inserted into the prepared hole 3d of the recess 3e in the closing plate 3b and moved so that the lower surface of the contact ring 25 contacts the upper surface of the recess 3e. In this state, the cutting blade 17 is positioned such that the cutting edge comes into contact with or is close to the upper surface of the closing plate 3b. (See Figure 6)

  Next, the electric motor 11 is driven to rotate the cutting blade 17 around the spindle 9 while energizing the tank drilling device 1 with the required pressure downward in the axial direction of the spindle 9 in the above state. The cutting of the closing plate 3b is started. When the central shaft 19 is gradually moved to the inside of the vehicle fuel tank 5 with a stroke according to the cutting depth of the closing plate 3b as the cutting of the closing plate 3b by the cutting blade 17 progresses, the contact ring 25 Is gradually moved upward with respect to the central axis 19 against the spring force of the first compression spring 29 by the stroke.

  As the abutment ring 25 moves above the axis, the slide shaft 27 gradually slides from the lower side to the upper side in the cam holes 31a, and the support arms 31 are moved by the respective claw portions 31b. Slowly swing to move in the diameter expansion direction. (See Figure 7)

  In the final stage of the cutting operation of the closing plate 3b by the cutting blade 17, the contact ring 25 further moves upward in the axial direction as the central shaft body 19 moves upward in the axial direction as the cutting of the closing plate 3b progresses. When the slide shaft 27 is moved upward in the cam holes 31a as shown in the figure, the respective support arms 31 are moved in the direction of diameter expansion of the respective support arms 31, and the lower surface of the closing plate 3b around the lower hole 3d. Oscillate to engage and hold.

  At this time, when the contact ring 25 is moved to a predetermined position above the axis with respect to the central shaft body 19, the distal end portion of the engaging pin 35 urged by the spring force of the second compression spring 37 is recessed. It engages with 19 c and holds the moving state of the contact ring 25 in the central shaft body 19.

As a result, after the cutting operation of the closing plate 3b by the cutting blade 17, the support arm 31 is kept swinging in the diameter increasing direction, and the engagement state of the lower surface of the closing plate 3b at the periphery of the pilot hole 3d by the claw portion 31b is maintained. The cut piece 3f cut out of the closing plate 3b is held. In addition, the abutting ring 25 is returned to the original position by the spring force of the first compression spring 29, and the cut piece 31f released from being held by the claw portion 31b comes out of the central shaft body 19 and falls into the vehicle fuel tank 5. To regulate. (See Figure 8)

After the closing plate 3b is cut by the above-described action to form the opening 7 in the component mounting portion 3, the arm of the work robot is moved and controlled so that the tank drilling device 1 moves away from the component mounting portion 3. Then, the cut piece 3 f inserted into the central shaft body 19 and held by the claw portion 31 b of the support arm 31 is taken out, and the opening 7 is formed in the component mounting portion 3. In order to remove the cut piece 3f that has been taken out from the central shaft body 19, the movement of the tank drilling device 1 is controlled so that the central shaft body 19 is placed between the arm portions 41a of the substantially U-shaped removal jig 41 in the plane. The part 41a is moved so as to contact the upper surface of the contact ring 25. Next, the tank drilling device 1 is moved in the axial direction of the central shaft body 19 shown in the figure, and the contact ring 25 is pressed against the arm portion 41a.

By the above operation, the engaging pin 35 whose tip is engaged with the recess 19c of the central shaft body 19 is moved radially outward against the spring force of the second compression spring 37 to forcibly release the engagement. . As a result, the abutment ring 25 is moved toward the distal end side by the spring force of the first compression spring 29 with respect to the central shaft body 19, and the slide shaft 27 is moved to the lower side of the cam hole 31 a as illustrated. As a result, each support arm 31 is swung so as to move in the direction in which each claw portion 31b is reduced in diameter, the holding of the claw portion 31b with respect to the cut piece 3f is released, and then the spring force of the first compression spring 29 is applied. The cut piece 3f protrudes from the central shaft body 19 and is detached by the contact ring 25 that moves to the distal end side. (See FIGS. 9 and 10)

  In this embodiment, as the cutting plate 17 b is rotated by the rotating cutting blade 17, the support arm 31 is gradually swung in the diameter increasing direction by the contact ring 25 that moves with respect to the central shaft body 19. The cut piece 3f cut by supporting the periphery of the hole 3d can be held, and the cut piece 3f can be prevented from falling into the vehicle fuel tank 5. For this reason, it is possible to reduce the size of the device itself by eliminating the need for a cylinder that operates the arm supporting the lower surface of the peripheral edge of the pilot hole in the diameter expansion direction as in the conventional expansion mechanism, and the small diameter opening 7 is also efficient. Can be formed.

Further, when the contact ring 25 is moved to a predetermined position with respect to the central shaft body 19 at the end of cutting, the engagement pin 35 is engaged with the recess 19 c and the contact ring 25 is a spring of the first compression spring 29. It is possible to keep the cut piece 3f held by the support arm 31 by restricting the return to force, prevent the cut piece 3f from falling into the vehicle fuel tank 5, and take it out of the vehicle fuel tank 5. it can.

DESCRIPTION OF SYMBOLS 1 Tank drilling device 3 Parts attachment part 3a Male screw 3b Closure plate 3c Cylindrical part 3d Pilot hole 3e Recess 3f Cutting piece 5 Vehicle fuel tank 7 as a tank 9 Opening 9 Spindle 11 Electric motor 13 Rotating body 13a Balancer member 15 Cutting tool Mounting arm 17 Cutting blade 19 Central shaft body 19a Arm portion 19b Shaft support hole 19c Recess 21 Bearing 23 Space 25 Contact ring 25a Through hole 27 Slide shaft 29 First compression spring 31 as first elastic member Support arm 31a Cam hole 31b Claw part 31c Through-hole 33 Shaft 35 Engagement pin 37 Second compression spring 41 as second elastic member Removal jig 41a Arm part

Claims (5)

In a tank drilling device in which a cutting blade provided at a required distance in the direction perpendicular to the axis from the axis of the rotationally driven spindle is rotated around the spindle to form a hole in the component mounting portion of the tank.
A base end portion is rotatably supported with respect to the shaft end portion of the spindle, and a pair of arm portions each having a gap extending in a direction coinciding with the axis line are formed and A shaft support hole extending in a direction coinciding with the axis is formed, and a central shaft body having an outer diameter that can be inserted into a pilot hole formed in advance in the center of the component mounting portion,
A shaft member supported by the shaft support hole so as to be slidable in the axial direction;
An abutting member supported so as to be movable in the axial direction with respect to the central shaft body and to which a shaft end portion of the shaft member is fixed;
A first elastic member for urging the contact member toward the distal end side of the central shaft body;
The cam shaft is formed symmetrically in the gap of the central shaft body, and a cam hole is formed in one end portion to be in sliding contact with the shaft member, and a claw portion is provided in the other end portion to resist the elastic force of the first elastic member. The claw portion is moved from the reduced diameter side located inside the outer diameter imaginary line of the central shaft body to the enlarged diameter side located outside the outer diameter imaginary line by the contact member moving to the proximal end side of the central shaft body. The claw portion is supported so as to be movable from the enlarged diameter side to the reduced diameter side by the contact member that is moved to the distal end side of the central shaft body by the elastic force of the first elastic member. A pair of left and right support arms,
Tank drilling device equipped with. 2. The support arm according to claim 1, wherein each support arm is clawed by a shaft member that is moved to one end side of the cam hole when the contact member is moved to the tip end side by the elastic force of the first elastic member with respect to the central shaft body. A tank drilling device that is slid so that the portion moves toward the reduced diameter side. 2. The tank punching device according to claim 1, wherein the cutting blade is in contact with the upper surface of the component mounting portion when the central shaft body is inserted into the prepared hole and the contact member is brought into contact with the upper surface of the prepared hole. 4. The support arm according to claim 3, wherein the support member gradually moves toward the base end against the elastic force of the first elastic member against the central shaft body as the cutting of the component attachment portion by the cutting blade progresses. A tank hole punching device in which a claw portion is swung so as to gradually move from the reduced diameter side to the enlarged diameter side by a shaft member moved from one end side to the other end side of the cam hole when moved. 2. The contact member according to claim 1, wherein a mounting hole extending in a direction perpendicular to the axis is formed in the contact member, and an engagement pin biased by the second elastic member is mounted in the mounting hole and rotated. When an opening is formed in the component mounting portion by the cutting blade and the abutting member is moved to the base end side of the central shaft body, the engagement pin is engaged with the recess provided on the outer peripheral surface of the central shaft body. And a tank punching device for holding the moving state of the contact member.

Images