JP5195119B2 - Sealing method - Google Patents

Description

  The present invention relates to a sealing method for sealing between the contact surfaces of a first member and a second member having surfaces that contact each other.

Conventionally, in the case of sealing between one member and another member, Patent Document 1 discloses that sealing is performed using a rubber O-ring. In this case, in order to seal between one member (pipe) and another member (cylindrical member) fitted and connected to the outside of the member, an O-ring is attached to the inner peripheral surface of the other member. Thereafter, one member is inserted and fitted into the other member. Further, in this, a groove that makes a round in the circumferential direction is formed between one member and another member, and an adhesive introduction hole that communicates with the groove from the outer surface is formed in one member. A technique for forming a seal member by pouring an adhesive into the groove from the adhesive introduction hole is also disclosed.
JP-A-10-176774

  In the above case, when sealing using an O-ring, an O-ring is attached to the inner peripheral surface of another member, and then one member is inserted and fitted into the other member. It is not possible to confirm how is sandwiched between the two members, and there is a possibility that it is not in an appropriate wearing state.

  On the other hand, when an adhesive is used in the above, it is effective as a sealing method instead of an O-ring. However, when the adhesive is poured into the groove from the adhesive introduction hole, the adhesive rotates from both sides of the groove. In some cases, dents and bubbles may be formed, resulting in incomplete sealing. In addition, since the adhesive wraps around from both sides of the groove in this way, air bubbles and the like may cause the operator to misjudg the completion of pouring of the adhesive, resulting in excess or deficiency with respect to the required amount of adhesive. In particular, insufficient adhesive may lead to incomplete filling of the adhesive.

  The present invention has been made in view of the above circumstances, and its purpose is to seal the first member and the second member with an adhesive, without generating bubbles at the seal location, and It is an object of the present invention to provide a sealing method capable of determining completion of adhesive filling without excess or deficiency of the adhesive and further increasing the degree of freedom in designing the seal shape.

  According to the first aspect of the present invention, in the state where the first member and the second member are in contact with each other, the adhesive injection jig is inserted into the through-hole and the adhesive introduction path of the adhesive injection jig. When the end is connected to the inlet of the seal groove of the first member and the other end of the air discharge path of the adhesive injection jig is connected to the outlet of the seal groove, the adhesive inlet The adhesive introduction path, the seal groove inlet, the seal groove, the seal groove outlet, the air discharge path, and the air escape port are formed as a series of adhesive passages. In this state, when a weakly viscous adhesive is injected from the adhesive injection port of the adhesive injection jig, that is, one of the mouths of the adhesive passage, the air escape which is the other mouth of the adhesive passage is made. Since the mouth is open to the atmosphere, the weakly viscous adhesive from the adhesive injection port is filled without generating bubbles toward the air escape port while sequentially pushing out the air in the adhesive passage, When the adhesive overflows from the air escape port, it can be determined that the adhesive has been filled in the seal groove in a state free from bubbles and in excess. When the adhesive overflows, the injection of the adhesive is stopped, and thereafter, the adhesive injection jig is removed, the adhesive is filled in the through hole, and the through hole is filled with the first through the lid. By covering from the opposite surface of the member, the through hole can also be filled with an adhesive without bubbles, and generally, the seal groove and the through hole can be filled with the adhesive, and the first member and the first member It is possible to securely seal between the contact surfaces with the two members without causing excessive or insufficient adhesive. And since it is such a sealing method, what kind of shape may be sufficient as the intermediate shape of a seal groove, and the design freedom of a seal shape can also be made high.

  Here, the significance of providing an inlet and an outlet on the side surface of the through hole is as follows. That is, in the present application, an adhesive is used without using a solid rubber sealing material, and the problem specific to the adhesive is that it leaks because it is liquid or semi-liquid, and the member that leaks because of adhesive capability May adhere to. Therefore, when the entrance and the exit are formed at appropriate places, if the adhesive leaks during attachment / detachment of the jig, it becomes a defective product and the defect rate increases. In the unlikely event that the jig is not disposable, it is highly probable that the previous adhesive remains, so there is a risk that the probability of occurrence of defective products will further increase.

  For this situation, if the inlet and outlet are provided on the side of the through hole, the through hole will eventually be filled with adhesive, so the adhesive will come out from the inlet, outlet, and the tip of the jig. Even if it comes, it will not be a defective product at all. Therefore, in the case where an adhesive is used for the sealing material as in the present application, it is very high technical significance to provide the inlet and the outlet on the side surface of the through hole.

  In the invention of claim 2, the adhesive injection jig has a flange portion larger than the through-hole, and a convex portion protruding from one end surface of the flange portion and fitted into the through-hole, and the adhesive An adhesive injection port of the introduction path is opened at the other end surface of the flange portion, and the adhesive introduction path passes through the flange portion and the convex portion from the adhesive injection port to the convex tip end surface, The leading end surface of the convex portion includes an introduction groove portion that communicates with the hole portion and extends to the outer peripheral surface of the convex portion, and an air escape port of the air discharge path opens at the side surface of the flange portion, and the air discharge path is A discharge hole portion that passes from the air escape port to the front end surface of the convex portion through the flange portion and the convex portion, and a discharge groove portion that communicates with the hole portion at the front end surface of the convex portion and extends to the outer peripheral surface of the convex portion, A positioning portion is provided on one end surface of the flange portion, and the first portion A positioning portion that engages with the positioned portion is provided on the opposite surface of the member, and by positioning the positioned portion with respect to the positioning portion, the introduction groove is aligned with a position communicating with the inlet; and The discharge groove is aligned with the position communicating with the outlet.

  According to the second aspect of the present invention, when the adhesive injection jig is fitted into the through-hole while the positioned portion of the adhesive injection jig is engaged with the positioning portion of the first member, the adhesive injection The introduction groove of the adhesive introduction path of the jig can be communicated with the inlet, and the discharge groove of the air discharge path of the adhesive injection jig can be communicated with the outlet. The seal groove can be reliably filled. Moreover, an adhesive inlet of the adhesive introduction path of the adhesive injection jig is opened at the other end surface of the flange portion, and an air escape port of the air discharge path is opened at the side surface of the flange portion. In other words, since the adhesive injection port and the air escape port are opened on different surfaces of the flange portion, even when an injection nozzle or the like is inserted into the adhesive injection port, air on a different surface from the injection nozzle The escape port can be seen without being obstructed by the injection nozzle, and the overflow of the adhesive can be easily confirmed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 13 shows an articulated robot 1, which is constructed by connecting first to sixth arms 3 to 8 in order via a first to sixth joints on a base 2. Has been. A cable connection port 9 is formed in the base 2, and a closing plate 10 that closes the opening is attached to the cable connection port 9.

The closing plate 10 corresponds to a first member, and the cable connection port 9 corresponds to a second member.
As shown in FIGS. 1 to 3, the cable connection port portion 9 has a substantially rectangular tube shape, and the distal end surface of the cable connection port portion 9 is formed as a flat surface. The contact surface 9a is in contact with the peripheral edge of the back surface 10r. In addition, a convex portion 9b that slightly protrudes inward is formed on the inner wall portion of the cable connection port 9, and the tip surface of the convex portion 9b constitutes a closing portion 9c. The closing portion 9c is flush with the contact surface 9a, and is thus included in the contact surface 9a.

Further, female thread portions 11 are formed at the four corners of the contact surface 9a.
The closing plate 10 has a substantially rectangular shape, and connector fitting holes 12 and 13 are formed through the closing plate 10, and the surface 10 h of the closing plate 10 of the connector fitting holes 12 and 13. As shown in FIG. 3 to FIG. 5, large-diameter O-ring arrangement portions 12 a and 13 a are formed in the side portions. In the connector fitting hole 12, for example, a power supply cable connector 14 is fitted, and is screwed to a female screw portion 15 a (see FIGS. 1 and 4) of the closing plate 10 with a screw 15. In this case, an O-ring 16 is arranged in advance in the O-ring arrangement portion 12 a and seals between the power feeding cable connector 14 and the connector fitting hole 12.

  Further, in the connector fitting hole 13, for example, a control cable connector 17 is fitted into the female screw portion 18 a (see FIGS. 1 and 4) of the closing plate 10 by screws 18. In this case, an O-ring 19 is arranged in advance in the O-ring arrangement portion 13 a and seals between the control cable connector 17 and the connector fitting hole 13.

Further, as shown in FIGS. 1, 4, and 5, the closing plate 10 is formed with a female screw 20 for screwing a required member used in the robot 1.
The back surface 10r of the closing plate 10 is formed flat, and the peripheral area corresponding to the contact surface 9a of the connection port 9 is used as the contact surface 10a on the back surface 10r.

  A through-hole 21 that penetrates from the contact surface 10a to the surface 10h that is the opposite surface is formed in a portion of the closing plate 10 that faces the closing portion 9c. The closing portion 9c is set to a size that can close the through hole 21. Screw insertion holes 10b are formed at four corners of the contact surface 10a of the closing plate 10.

  Further, a sealing groove 22 having a concave cross section is formed on the contact surface 10 a of the closing plate 10. One end of the seal groove 22 opens as an inlet 22 a on the side surface of the through hole 21, and a middle portion thereof circulates around the contact surface 10 a, and the other end opens as an outlet 22 b on the side surface of the through hole 21. In this case, the middle portion of the seal groove 22 is bent to avoid the female screw 20.

Further, a pin fitting hole 23 (corresponding to a positioning portion) is formed in a non-penetrating form from the surface 10h side near the through hole 21 in the closing plate 10, and further, a female screw for attaching a lid from the surface 10h side. The parts 24, 24 are formed in a non-penetrating form.
In FIG. 1, the connectors 14 and 17 are omitted for convenience of description of the configuration of the closing plate 10, but the closing plate 10 is actually connected to the connection port 9 with the connectors 14 and 17 attached. It is what is done.

  The adhesive injection jig 25 shown in FIGS. 1, 6, and 7 is fitted into the through hole 21 without a gap, and has a flange portion 25 a larger than the through hole 21 and one end surface of the flange portion 25 a. A substantially cylindrical convex portion 25c that protrudes from 25b and is fitted into the through-hole 21.

An adhesive introduction path 26 and an air discharge path 27 are formed in the adhesive injection jig 25.
One end of the adhesive introduction path 26 opens as an adhesive injection port 26a at the other end face 25d of the flange portion 25a. The adhesive introduction path 26 includes an introduction hole portion 26b that passes from the adhesive injection port 26a through the flange portion 25a and the convex portion 25c to the front end surface of the convex portion 25c, and the introduction hole at the front end surface of the convex portion 25c. A leading groove portion 26c that communicates with the portion 26b and extends to the outer peripheral surface of the convex portion 25c, and a leading end portion 26d of the introducing groove portion 26c (the other end portion of the adhesive introduction path 26) opens at the outer peripheral surface portion of the convex portion 25c. In addition, it communicates with the inlet 22a of the seal groove 22 (described later).

  Although not shown, the adhesive injection port 26a is inserted with a nozzle of an adhesive injection device. In this case, it is preferable that a rubber injection body (not shown) for receiving the nozzle is attached in advance to the adhesive injection port 26a.

  An air escape port 27 a, which is one end portion of the air discharge path 27, opens at a side surface 25 e of the flange portion 25 a of the adhesive injection jig 25. The air discharge path 27 includes an air discharge hole portion 27b that passes from the air escape port 27a through the flange portion 25a and the convex portion 25c to the front end surface of the convex portion 25c, and the air discharge hole portion at the front end surface of the convex portion 25c. The air discharge groove portion 27c extends to the outer peripheral surface of the convex portion 25c in communication with 27b. A front end portion 27d of the air discharge groove portion 27c (the other end portion of the air discharge passage 27) is opened at the outer peripheral surface portion of the convex portion 25c and communicates with the outlet 22b of the seal groove 22 ( Will be described later).

  A pin fitting hole 28 is formed in one end face 25b of the flange portion 25a of the adhesive injection jig 25, and a pin 29 (corresponding to the positioned portion) partially protrudes from the pin fitting hole 28. It is designed to be fitted with.

Further, a groove 25f for arranging the O-ring 30 is formed on the outer peripheral surface of the convex portion 25c of the adhesive injection jig 25.
The lid 31 shown in FIGS. 1 and 8 has a configuration in which a short columnar convex portion 31b is formed on a rectangular plate-like lid body 31a. The convex portion 31b is formed to have a diameter that can be fitted into the through hole 21 with almost no gap, and the axial length of the convex portion 31b is set slightly shorter than the axial length of the through hole 21. Yes.

Furthermore, screw insertion holes 31c and 31c are formed in the lid body 31a of the lid 31.
Now, a method for sealing the contact surface 9a of the cable connection port 9 of the robot 1 and the contact surface 10a of the closing plate 10 will be described.

  (1) First, as shown in FIG. 9, the closing plate 10 is attached to the cable connection port portion 9 by inserting the screw 32 through the screw insertion hole 10 b and screwing into the female screw portion 11. Thereby, the contact surfaces 9a and 10a contact. Further, the opening on the side of the cable connection port 9 in the through hole 21 is closed by the closing portion 9 c of the cable connection port 9. Further, the O-ring 30 and the pin 29 are attached to the adhesive injection jig 25.

  (2) From this state, the convex portion 25c of the adhesive injection jig 25 is inserted into the through-hole 21 while the pin 29 of the adhesive injection jig 25 is engaged with the pin fitting hole 23 of the closing plate 10. Insert (see FIGS. 10 to 12). By engaging (positioning) the pin 29 and the pin fitting hole 23, the leading end portion 26d of the introduction groove portion 26c of the adhesive injection jig 25 is aligned with a position communicating with the inlet 22a of the seal groove 22; And the front-end | tip part 27d of the said air discharge groove part 27c is aligned with the position connected to the exit 22b of the said seal groove 22. FIG.

In this state, the adhesive injection jig 25 is fitted into the through hole 21 by the O-ring 30 without a gap.
(3) In this state, a nozzle of an adhesive injection device (not shown) is inserted into the adhesive injection port 26a of the adhesive injection jig 25, and a weakly viscous adhesive 33 (see FIG. 3) is inserted from the adhesive injection port 26a. ). The adhesive 33 is made of, for example, an epoxy adhesive containing a volatile solvent, and is cured when the volatile solvent is volatilized.

  The adhesive 33 injected from the adhesive injection port 26 a enters the seal groove 22 through the introduction hole 26 b of the adhesive introduction path 26, the introduction groove 26 c, and the inlet 22 a of the seal groove 22, and the seal groove 22. The air inside the outlet 22b, the air discharge groove 27c of the air discharge path 27, the air discharge hole 27b, and the air escape port 27a are sequentially pushed out and gradually filled toward the outlet 22b.

  (4) When the adhesive 33 overflows from the air escape port 27a, the injection of the adhesive 33 is stopped. It can be seen that the adhesive 33 is completely sealed in the seal groove 22 due to the overflow of the adhesive 33.

(5) Thereafter, the adhesive injection jig 25 is removed.
(6) The adhesive 33 is filled in the through hole 21 with the required amount of the adhesive 33, for example.
(7) Then, as shown in FIGS. 5 and 8, the screw 34 is screwed into the female screw portion 24 through the screw insertion hole 31 c, so that the through hole 21 is covered by the lid 31 from the surface 10 h of the closing plate 10. To do. Thereby, the through hole 21 is sealed in a state where the convex portion 31 b of the lid 31 enters the through hole 21. At this time, the sealed space in the through hole 21 is filled with the necessary amount of the adhesive 33.

As a result, the adhesive groove 33 is filled in the seal groove 22 and the through hole 21, and the contact surface 9 a of the cable connection port 9 and the contact surface 10 a of the closing plate 10 are sealed with the adhesive 33.
In this case, the adhesive 33 is solidified by volatilization of the volatile solvent over time, but sufficient sealing performance can be obtained even in a relatively soft state before solidification.

  According to such an embodiment, the adhesive injection treatment is performed in the through-hole 21 in a state in which the closing plate 10 as the first member and the cable connection port portion 9 of the robot 1 as the second member are connected to each other. The tool 25 is communicated with the inlet 22a of the seal groove 22 of the closing plate 10 at the other end of the adhesive introduction path 26 of the adhesive injection jig 25 (the end 26d of the introduction groove 26c), and the adhesive is injected. When the other end portion of the air discharge passage 27 of the jig 25 (the tip portion 27d of the air discharge groove portion 27c) is fitted into a form communicating with the outlet 22b of the seal groove 22, an adhesive injection port 26a and an adhesive introduction passage 26 are provided. The inlet 22a of the seal groove 22, the seal groove 22, the outlet 22b of the seal groove 22, the air discharge passage 27, and the air escape port 27a are formed as a series of adhesive passages.

  In this state, when the weakly viscous adhesive 33 is injected from the adhesive injection port 26a of the adhesive injection jig 25, the air escape port 27a, which is the other port of the series of adhesive passages, is brought into the atmosphere. Since the adhesive 33 is open, the adhesive 33 is sequentially filled in the adhesive passage without generating air bubbles toward the air escape port 27a while extruding the air in the adhesive passage. When the adhesive 33 overflows from the air escape port 27a, it can be determined that the adhesive 33 is filled with the adhesive 33 without bubbles in the seal groove 22.

  When the adhesive 33 overflows, the injection of the adhesive is stopped. Thereafter, the adhesive injection jig 25 is removed, the adhesive 33 is filled in the through hole 21, and the lid 31 is used to By covering the through hole 21 from the surface of the closing plate 10, the through hole 21 can also be filled with the adhesive 33 without bubbles, and generally, the seal groove 22 and the through hole 21 can be filled with the adhesive 33, It is possible to seal between the contact surfaces of the cable connection port portion 9 and the closing plate 10 reliably and without causing the adhesive 33 to be excessive or insufficient. And since it is such a sealing method, any shape may be sufficient as the intermediate | middle shape of the seal groove 22, and the design freedom of a seal shape can also be made high.

  Further, according to the present embodiment, the adhesive injection jig 25 is inserted into the pin fitting hole 23 that is the positioning portion of the closing plate 10 while the pin 29 that is the positioning portion of the adhesive injection jig 25 is engaged with the pin fitting hole 23. When fitted into the through hole 21, the introduction groove 26 b of the adhesive introduction path 26 of the adhesive injection jig 25 can be communicated with the inlet 22 a of the seal groove 22, and the adhesive injection jig 25. The air discharge groove 27b of the air discharge path 27 can be communicated with the outlet 22b of the seal groove 22 by itself, so that the adhesive can be reliably filled in the seal groove. Moreover, the adhesive inlet 26 a of the adhesive introduction path 26 of the adhesive injection jig 25 opens at the other end face 25 d of the flange portion 25 a of the adhesive injection jig 25, and the air escape of the air discharge path 27 is performed. Since the opening 27a is opened on the side surface of the flange portion 25a, that is, the adhesive injection port 26a and the air escape port 27a are opened on different surfaces of the flange portion 25a, the injection is made into the adhesive injection port 26a. Even when a nozzle or the like is inserted, the air escape port 27a on a surface different from the injection nozzle can be seen without being obstructed by the injection nozzle, and the overflow of the adhesive 33 can be easily confirmed.

  In addition, this invention is not limited to the Example mentioned above, For example, a 1st member and a 2nd member are not restricted to the obstruction board 10 mentioned above and the cable connection port part 9 of the robot 1, Various types are mentioned. Applicable to sealing between members. Also, the shape of the seal groove can be variously changed. Further, the positioning part may be constituted by a pin, and the positioned part may be constituted by a pin fitting hole, and the positioning part and the positioned part are not limited to these pins and the pin fitting hole.

1 is an exploded perspective view of a connection port portion, a closing plate, an adhesive injection jig, and a lid according to an embodiment of the present invention. Front view of cable connection Longitudinal side view of the cable connection port in the sealed state View of the obstruction plate viewed from the back Front view of the cable connection port in the sealed state Perspective view of adhesive injection jig (A) is a side view of an adhesive injection jig with an O-ring and a pin attached, (b) is a front view, (c) is a rear view, and (d) is a transverse plan view. 5 is a cross-sectional view taken along line AA in FIG. Longitudinal side view of the cable connection port before sealing Front view of cable connection port part showing adhesive injection jig assembly state 10 is a cross-sectional view taken along line BB in FIG. 10 is a cross-sectional view taken along line CC in FIG. Robot perspective view

Explanation of symbols

  In the drawings, 1 is a robot, 9 is a cable connection port (second member), 9a is a contact surface, 9c is a closing portion, 10 is a closing plate (first member), 10a is a contact surface, and 22 is a seal groove. 22a is an inlet, 22b is an outlet, 23 is a pin fitting hole (positioning portion), 25 is an adhesive injection jig, 25a is a flange portion, 25c is a convex portion, 26 is an adhesive introduction path, and 26a is an adhesive injection Inlet (one end of the adhesive introduction path), 26b is an introduction hole, 26c is an introduction groove, 26d is a tip (the other end of the adhesive introduction path), 27 is an air discharge path, 27a is an air escape port (air One end of the discharge path), 27b is an air discharge hole, 27c is an air discharge groove, 27d is a tip (the other end of the air discharge path), 29 is a pin (positioned part), and 31 is a lid.

Claims (2)

A method of sealing between the contact surfaces of a first member and a second member having surfaces that contact each other,
Forming a through-hole penetrating from the contact surface of the first member to the opposite surface of the first member;
The contact surface of the second member includes a closing portion that closes an opening end of the through hole on the contact surface side of the first member;
A seal in which one end of the first member opens as an inlet at the side surface of the through hole, a middle portion circulates around the contact surface, and the other end opens as an outlet at the side surface of the through hole. Forming grooves,
An adhesive injection jig that fits in the through hole without a gap, and a lid that closes the through hole from the opposite surface;
The adhesive injection jig includes an adhesive introduction path having one end opening as an adhesive injection port and the other end communicating with the inlet, one end opening as an air escape port, and the other end being the outlet. A communicating air discharge path is formed,
In a state where the first member and the second member are in contact with each other, the adhesive injection jig is connected to the through hole, the other end portion of the adhesive introduction path communicates with the inlet, and the air discharge path. Is fitted in a form in which the other end portion communicates with the outlet,
In this state, a weakly viscous adhesive is injected from the adhesive injection port of the adhesive injection jig,
Stopping the adhesive injection when the adhesive overflows from the air vent,
Then, remove the adhesive injection jig,
Filling the through hole with the adhesive;
The sealing method, wherein the through hole is covered from the opposite surface of the first member by the lid. The adhesive injection jig has a flange portion larger than the through hole, and a convex portion protruding from one end surface of the flange portion and fitted into the through hole,
The adhesive inlet of the adhesive introduction path opens at the other end surface of the flange portion, and the adhesive introduction path passes through the flange portion and the convex portion from the adhesive inlet to the front end surface of the convex portion. And an introduction groove that communicates with the hole at the front end surface of the convex portion and extends to the outer peripheral surface of the convex portion,
The air discharge passage of the air discharge passage opens at the side surface of the flange portion, and the air discharge passage includes a discharge hole portion passing through the flange portion and the convex portion from the air escape port to the front end surface of the convex portion, and the convex portion. A discharge groove portion that communicates with the hole portion at the front end surface of the portion and extends to the outer peripheral surface of the convex portion,
A positioning portion is provided on one end surface of the flange portion, and a positioning portion that engages with the positioning portion is provided on the opposite surface of the first member,
2. The engagement of the positioned portion with the positioning portion aligns the introduction groove portion with a position communicating with the inlet, and aligns the discharge groove portion with a position communicating with the outlet. The sealing method described in 1.

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