JP2015203445A - Hole sealing cap and industrial machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hole sealing cap capable of preventing powder dust and liquid from being accumulated on a cover external surface, and capable of being removed, and an industrial machine.SOLUTION: A hole sealing cap is provided in the cover of a vertical multi-joint robot, and seals a hole. The hole sealing cap includes a cylindrical part 11, and a blockage part 12 blocking an upper end 11a of the cylindrical part 11. The blockage part 12 has a thick dimension that is made thinner than the cylindrical part 11, and can be penetrated by a removal tool; and is press-fitted from a lower end side to a hole so as to be flush with the surface of the cover.

Description

  The present invention relates to a hole sealing cap and an industrial machine that prevent dust and liquid from accumulating in a hole.

  A robot apparatus widely used as an industrial machine has a skeleton, joint structure, wiring, etc. covered with a cover, but generally the cover is a divided structure, so that a space for accommodating the joint structure etc. is formed. A plurality of cover parts face each other and are fixed by screwing. Usually, the cover is formed with a hole (concave part) so that the fixing screw does not protrude, and when the cover parts are screwed together, the fixing screw is arranged in the hole. Yes.

  The robotic device may be used in an environment where dust or liquid is generated. In that case, seal the hole to prevent the fixing screw from protruding, and seal the hole inside the hole. To prevent dust and liquid from accumulating.

  As a cap for sealing a hole, there is known a configuration in which a cap is attached by tightening a bolt and removed by loosening the bolt (for example, see Patent Document 1).

  Moreover, the thing of the structure attached by pressing a cap into a hole is known as a cap which seals a hole (for example, refer patent document 2).

  Furthermore, as a cap for sealing the hole, there is a known configuration in which the cap is fitted into a hexagonal hole of a screw existing inside the hole, and the cap is deformed and removed by pushing the center of the cap. (For example, refer to Patent Document 3).

JP 2011-12802 A JP 2007-321769 A Japanese Utility Model Publication No. 7-35814

  When using industrial machinery such as robotic devices in places where hygiene is important, such as food factories and pharmaceutical factories, not only dust and liquid do not collect in the holes, but also dust and liquid adhering to the cover surface can be easily removed. It must be wiped off.

  The cap having the configuration disclosed in Patent Document 1 has a problem in that dust and liquid accumulate on the outer surface of the cap because the bolt has unevenness on the outer surface because the bolt is installed on the cap itself. For this reason, it is unsuitable for application to an industrial machine used in a place where dust or liquid is generated.

  The cap configured as disclosed in Patent Document 2 has a problem that the press-fitted cap cannot be removed.

  Since the cap having the configuration disclosed in Patent Document 3 needs to be deformed when removed, the hole cannot be completely sealed.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the hole sealing cap and industrial machine which can prevent dust and a liquid accumulating on a cover outer surface, and are removable.

  In order to solve the above-described problems and achieve the object, the present invention provides a hole sealing cap for sealing a screw insertion hole provided in a cover of an industrial machine, which includes a cylindrical tube portion and a tube A closing portion that closes the upper end of the portion, and the closing portion is thinner than the cylindrical portion and has a thickness that can be broken by a rod-like member, and the closing portion is flush with the surface of the cover. Thus, it is press-fitted into the screw insertion hole from the lower end side.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that it can prevent that a dust and a liquid accumulate on an outer surface, and a hole sealing cap is removable.

FIG. 1 is a diagram showing a configuration of a first embodiment of a hole sealing cap according to the present invention. FIG. 2 is a diagram illustrating an embodiment of a vertical articulated robot using a cover to which the hole sealing cap according to the first embodiment is applied. FIG. 3 is a schematic cross-sectional view of the cover of the robot apparatus at the hole portion. FIG. 4 is a view showing how to remove the hole sealing cap. FIG. 5 is a cross-sectional view of a second embodiment of the hole sealing cap according to the present invention. FIG. 6 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the second embodiment is press-fitted into the hole. FIG. 7 is a diagram showing how to remove the hole sealing cap according to the second embodiment. FIG. 8 is a sectional view of Embodiment 3 of the hole sealing cap according to the present invention. FIG. 9 is a diagram illustrating a state in which the hole sealing cap according to the third embodiment is pushed into the hole. FIG. 10 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the fourth embodiment is press-fitted into the hole. FIG. 11 is a diagram illustrating a state where the hole sealing cap according to the fourth embodiment is pushed into the hole. FIG. 12 is a view showing a state in which the closed portion of the hole sealing cap that has been pushed down to the step is pierced with a metal fitting. FIG. 13 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the fifth embodiment is press-fitted into the hole.

  Hereinafter, embodiments of a hole sealing cap and an industrial machine according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1A and 1B are diagrams showing the configuration of Embodiment 1 of a hole sealing cap according to the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a partial cross-sectional view. FIG. 1B shows a cross section taken along line Ib-Ib in FIG. The hole sealing cap 1 has a cylindrical portion 11 and a closed portion 12, and has a shape in which the upper end 11 a side of the cylindrical portion 11 is closed by the closed portion 12. The hole sealing cap 1 is formed of a resin (for example, rubber or urethane) or a metal (for example, aluminum) that is an elastic body. The outer peripheral surface 11b of the cylindrical part 11 is a tapered surface having a smaller diameter toward the lower end 11c side. The closed portion 12 is thinner than the cylindrical portion 11 and can be pierced by a rod-shaped member as will be described later.

  FIG. 2 is a diagram illustrating an embodiment of the vertical articulated robot to which the hole sealing cap according to the first embodiment is applied. The vertical articulated robot 50 according to the first embodiment is a 6-axis vertical articulated robot, and includes a base 51, a first arm 52, a second arm 53, and a wrist 54. Between the base 51 and the first arm 52, a first axis (J1) for rotating the first arm 52 in the horizontal direction and a second axis (J2) for rotating the first arm 52 in the vertical direction are provided. Yes. A third axis (J3) that rotates the second arm 53 in the vertical direction is provided between the first arm 52 and the second arm 53. The second arm 53 includes a fourth shaft (J4) that rotates so that the distal end side of the second arm 53 is twisted with the longitudinal direction as the axial direction, and the distal end side is branched into two. The second arm 53 supports the wrist 54 from both sides so that the wrist 54 can rotate on the fifth axis (J5). The list 54 includes a hand interface (I / F) 55 to which an end effector (hand or the like) is attached, and the end effector attached to the hand I / F 55 is orthogonal to the fifth axis (J5). The sixth shaft (J6) can be rotated so as to be twisted about the rotation shaft.

  The base 51, the first arm 52, the second arm 53, and the wrist 54 are covered with a cover 60 in which cover parts are fixed with screws. A hole 3 (concave portion) is formed at a screwed portion of the cover 60 so that a fixing screw does not protrude. The hole sealing cap 1 according to this embodiment is used for sealing the hole 3.

  FIG. 3 is a schematic cross-sectional view of the cover of the robot apparatus at the hole portion. The hole sealing cap 1 is fitted into the hole 3 by being press-fitted into the hole 3 in which the screw 40 is disposed from the lower end 11 c side. By using a jig larger than the hole 3 at the time of press-fitting, the hole sealing cap 1 is installed so that the upper end 11 a of the cylindrical portion 11 is flush with the surface of the cover 60. For this reason, there is no step on the surface of the cover 60 where dust and liquid accumulate. Since the outer peripheral surface 11b of the cylinder part 11 is a taper surface, the hole sealing cap 1 can be easily press-fitted into the hole 3 larger than the diameter of the lower end 11c. When the hole sealing cap 1 is formed of metal, a metal softer than the cover 60 (having a higher elastic modulus than the material of the cover 60) so as not to damage the cover 60 when pressed into the hole 3 is used. (Small metal) should be used as the material. When the cover 60 is made of resin, the hole sealing cap 1 is preferably made of resin instead of metal.

  The diameter of the hole sealing cap 1 is larger than the diameter of the hole 3. The diameter of the hole sealing cap 1 will be described later.

  FIG. 4 is a view showing how to remove the hole sealing cap. When removing the hole sealing cap 1, a bowl-shaped removal tool 6 (bar-shaped member) is used. The removal tool 6 breaks through the closing portion 12 and inserts the removal tool 6 into the hole 3 farther than the lower end 11c of the cylindrical portion 11. When the removal tool 6 is pulled out from the hole 3, the removal tool 6 engages with the lower end 11 c of the cylindrical portion 11. When the removal tool 6 engaged with the lower end 11 c of the cylindrical portion 11 is extracted from the hole 3, the hole sealing cap 1 is also removed from the hole 3.

  Here, the diameter of the hole sealing cap 1 will be described. In order for the removal tool 6 to break through the closing portion 12, the frictional force generated between the hole sealing cap 1 and the hole 3 must be smaller than the force required to break through the closing portion 12. That is, it is necessary to prevent the hole sealing cap 1 from being pushed into the inner side of the hole 3 when breaking through the blocking portion 12. For this reason, the value of the diameter x of the hole sealing cap 1 is determined so as to satisfy the following formula (1).

  Fp <μ · k · (x−D) (1)

  In the above formula (1), Fp is a force required to break through the blocking portion 12, and μ is a coefficient of friction between the side surface of the hole sealing cap 1 and the inner surface of the hole 3. D is the diameter of the hole 3, and k is the elastic coefficient of the hole sealing cap 1.

  Here, an example in which the blocking portion 12 is provided in the radial center of the hole sealing cap 1 is taken as an example, but the blocking portion 12 does not completely coincide with the radial center of the hole sealing cap 1. May be.

  Thus, the hole sealing cap according to Embodiment 1 can prevent dust and liquid from accumulating on the outer surface of the cover, and is removable.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view of a second embodiment of the hole sealing cap according to the present invention. The hole sealing cap 1 according to the second embodiment is substantially the same as that of the first embodiment. However, a half cut 12 a that is a cut that does not penetrate to the upper surface is formed on the lower surface of the closing portion 12.

  FIG. 6 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the second embodiment is press-fitted into the hole. In a state where the hole sealing cap 1 is press-fitted into the hole 3 in which the screw 40 is disposed, the half cut 12a provided on the lower surface of the closing portion 12 is not exposed on the surface side of the cover 60. Dust and liquid do not accumulate.

  FIG. 7 is a diagram showing how to remove the hole sealing cap according to the second embodiment. When the closing part 12 is pierced with the removal fitting 6, when the closing part 12 is pushed down with the removal fitting 6, stress concentrates on the portion of the half cut 12a. The blocking portion 12 can be broken through with a weak force. Therefore, the hole sealing cap 1 can be prevented from being pushed into the hole 3.

  Others are the same as in the first embodiment.

  Thus, the hole sealing cap according to Embodiment 2 can prevent dust and liquid from accumulating on the outer surface and is removable.

Embodiment 3 FIG.
FIG. 8 is a sectional view of Embodiment 3 of the hole sealing cap according to the present invention. The hole sealing cap 1 according to the third embodiment is substantially the same as that of the first embodiment, but a step 11 d is formed on the inner surface of the cylindrical portion 11. The inner diameter of the lower cylindrical portion 11e below the step 11d is larger than the inner diameter of the upper cylindrical portion 11f above the step 11d.

  FIG. 9 is a diagram illustrating a state in which the hole sealing cap according to the third embodiment is pushed into the hole. Even when the hole sealing cap 1 is pushed into the hole 3 where the screw 40 is disposed (until it abuts on the screw 40), it is removed below the step 11d. A space for placing the metal fitting 6 is secured. Therefore, even if the hole sealing cap 1 is pushed into the hole 3 when the closing part 12 is pierced by the removal metal fitting 6, it can be removed by hooking the collar part of the removal metal fitting 6 on the step 11d. Therefore, the frictional force between the hole prevention cap 1 and the inner surface of the hole 3 is such that the hole sealing cap 1 can prevent the hole sealing cap 1 from going into the hole 3 due to its own weight or falling off the hole 3. It is not necessary to satisfy the above formula (1). Therefore, the hole sealing cap 1 does not need to increase the thickness of the cylindrical portion 11 in order to increase the contact area with the inner surface of the hole 3, and can be reduced in size and weight.

  Others are the same as in the first embodiment.

  Thus, the hole sealing cap according to Embodiment 3 can prevent dust and liquid from accumulating on the outer surface and is removable.

Embodiment 4 FIG.
FIG. 10 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the fourth embodiment is press-fitted into the hole. In the robot apparatus according to the fourth embodiment, the step 3a is formed in the hole 3 in which the screw 40 of the cover 60 is disposed, and the upper side of the step 3a is the upper hole step 3b, and the lower side of the step 3a. Is the lower hole stage 3c. The inner diameter of the upper hole stage 3b is larger than the inner diameter of the lower hole stage 3c. Further, the inner diameter of the lower hole stage 3 c is larger than the inner diameter of the cylindrical portion 11. The hole sealing cap 1 is the same as that of the first embodiment, and has a blocking portion 12 and a cylindrical portion 11.

  FIG. 11 is a diagram illustrating a state where the hole sealing cap according to the fourth embodiment is pushed into the hole. Even when the hole sealing cap 1 is pushed into the hole 3 of the cover 60 when the blocking portion 12 is pierced with the metal fitting 6, the hole sealing cap 1 stops at the step 3a and is not pushed down to the lower hole step 3c. .

  FIG. 12 is a view showing a state in which the closed portion of the hole sealing cap that has been pushed down to the step is pierced with a metal fitting. The hole sealing cap 1 stopped at the step 3a can be removed from the hole 3 of the cover 60 by breaking through the closing portion 12 and then hooking the collar portion of the metal fitting 6 on the lower end 11c. Therefore, the frictional force between the hole prevention cap 1 and the inner surface of the hole 3 is such that the hole sealing cap 1 can prevent the hole sealing cap 1 from going into the hole 3 due to its own weight or falling off the hole 3. It is not necessary to satisfy the above formula (1). Therefore, the hole sealing cap 1 having a small contact area with the inner surface of the hole 3 can be used.

Embodiment 5 FIG.
FIG. 13 is a schematic cross-sectional view of the cover of the robot apparatus in a state where the hole sealing cap according to the fifth embodiment is press-fitted into the hole. In the robot apparatus according to the fifth embodiment, a counterbore 3e is formed at the opening of the hole 3 where the screw 40 of the cover 60 is disposed. The cylindrical portion 11 of the hole sealing cap 1 according to Embodiment 5 has an upper cylindrical portion 11g having a shape corresponding to the counterbore 3e and a lower cylindrical portion 11h that is press-fitted into the hole 3.

  The hole sealing cap 1 is press-fitted into the hole 3 using a jig larger than the upper cylinder portion 11g. By increasing the dimensional accuracy of the hole sealing cap 1, the hole sealing cap 1 can be disposed flush with the surface of the cover 60 of the robot apparatus.

  When the removal fitting 6 breaks through the closing portion 12, the hole sealing cap 1 is prevented from being pushed into the hole 3 by providing the upper cylinder portion 11 g. Therefore, the frictional force between the hole prevention cap 1 and the inner surface of the hole 3 is such that the hole sealing cap 1 can prevent the hole sealing cap 1 from going into the hole 3 due to its own weight or falling off the hole 3. It is not necessary to satisfy the above formula (1). Therefore, the hole sealing cap 1 having a small contact area with the inner surface of the hole 3 can be used.

  For the purpose of deburring or the like, it is a common practice to apply counterbore to holes in machine parts such as a cover of a robot apparatus. In the fifth embodiment, in order to prevent the hole sealing cap 1 from being pushed into the hole 3 by using counterbore, compared to the fourth embodiment in which the step 3a is provided in the hole 3, the cover of the robot apparatus is Processing can be facilitated.

  In each of the above-described embodiments, the robot apparatus is described as an example of the industrial machine. However, the hole sealing cap according to each embodiment is also used for industrial machines (for example, machine tools) other than the robot apparatus. Applicable.

  As described above, the hole sealing cap and the industrial machine according to the present invention are useful in that dust and liquid can be prevented from accumulating on the outer surface and can be removed. Suitable for use in industrial factories.

  1 hole sealing cap, 3 holes, 3a step, 3b hole upper step, 3c hole lower step, 3e counterbore, 6 removal tool, 11 cylinder part, 11a upper end, 11b outer peripheral surface, 11c lower end, 11d step difference, 11e cylinder part lower part, 11f Upper cylinder part, 11g Upper cylinder part, 11h Lower cylinder part, 12 Blocking part, 12a Half cut, 40 Screw, 50 Vertical articulated robot, 51 Base, 52 First arm, 53 Second arm, 54 Wrist, 55 Hand I / F, 60 cover.

Claims (6)

A hole sealing cap for sealing a screw insertion hole provided in a cover of an industrial machine,
A cylindrical tube portion, and a closing portion for closing the upper end of the tube portion,
The blocking portion is thinner than the cylindrical portion, and has a thickness dimension that can be broken by a rod-shaped member,
A hole sealing cap, wherein the screw sealing hole is press-fitted into the screw insertion hole from the lower end side so that the closing portion is flush with the surface of the cover.   2. The hole sealing cap according to claim 1, wherein the closing portion has a cut formed in the lower surface that does not penetrate to the upper surface.   The cylindrical portion has a step on an inner cylindrical surface, and the inner diameter of the upper portion of the cylindrical portion above the step is smaller than the inner diameter of the lower portion of the cylindrical portion below the step. Or the hole sealing cap of 2.   The said cylinder part has the upper cylinder part which is a shape corresponding to the counterbore formed in the opening edge of the said screw insertion hole, and the lower cylinder part inserted in the said screw insertion hole, The said cylinder part is characterized by the above-mentioned. 4. The hole sealing cap according to any one of items 1 to 3. An industrial machine provided with a screw insertion hole into which a screw is inserted,
The hole sealing cap according to any one of claims 1 to 4, wherein the screw insertion hole is press-fitted into the screw insertion hole from the lower end side so that the closing portion is flush with the cover surface. Industrial machine characterized by sealing with a hole sealing cap.   The screw insertion hole has a step on the inner cylinder surface, and the inner diameter of the upper step of the hole above the step is larger than the outer diameter of the cylindrical portion, and the inner diameter of the lower step of the hole below the step is the cylinder. The industrial machine according to claim 5, wherein the industrial machine is smaller than an outer diameter of the portion.

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