JP4032701B2 - O-ring removal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an O-ring removing device used for removing an O-ring assembled to a part to be assembled from the part to be assembled.
[0002]
[Prior art]
In order to remove the O-ring 2 assembled to the part 1 to be assembled from the part 1 to be assembled, conventionally, the inner periphery of the O-ring 2 is used by using tweezers or a hook jig 5 as shown in FIG. The O-ring 2 was removed from the part 1 to be assembled by spreading the O-ring 2 after being hooked. However, in this conventional method, when the removal jig 5 such as a key jig is hooked on the inner periphery of the O-ring 2, the surface of the O-ring 2 or the part 1 to be assembled is damaged or the removal work takes time. There was a problem.
[0003]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and can remove an O-ring easily without damaging the O-ring and a part to be assembled, and can reduce the time required for removing the O-ring. Is to provide.
[0004]
[Means for Solving the Problems]
The present invention provides an O-ring removal device according to each of the claims as means for solving the above-mentioned problems.
The O-ring removing device according to claim 1 pressurizes the O-ring by applying a load to a pressing body that is pressed at a predetermined angle to at least two points on the outer periphery of the O-ring assembled to the part to be assembled. has a pressurizing means, a gap insert write no two pawls between O-ring and the assembly part to be formed by applying pressure to the O-ring, further expand the O-ring by expanding the distance between nail comrades In the pressure means, two sets of pressing bodies are provided symmetrically with respect to the part to be assembled, and the expansion means having two claws is provided in the same manner. is obtained by the two pairs is provided so that, thereby, without damaging the O-ring and the assembly part of the surface can be removed easily O-ring from the assembly parts. Further, the removal work efficiency can be improved as compared with the conventional O-ring removal method. In addition , two sets of pressing bodies are provided as two sets symmetrically with respect to the part to be mounted, and two sets of expansion means having two claws are provided. Two gaps with the assembly parts are formed, and two claws of the two expansion means can be inserted into these gaps one by one, and the O-ring can be expanded from both sides.
[0005]
The O-ring removing device according to claim 2 pressurizes the O-ring by applying a load to a pressing body that is pressed at a predetermined angle to at least two points on the outer periphery of the O-ring assembled to the part to be assembled. Expansion that further expands the O-ring by having three claws inserted into the gap between the pressurizing means and the O-ring formed by pressurizing the O-ring and the part to be assembled. In the pressurizing means, two sets of pressing bodies are provided as one set, and three sets are provided on the outer periphery of the O-ring at a substantially equal angle in the circumferential direction, and the expansion means has three claws. Thus, the O-ring can be easily detached from the assembled part without damaging the surface of the O-ring or the assembled part. Further, the removal work efficiency can be improved as compared with the conventional O-ring removal method. In addition, two sets of pressing bodies are provided as one set on the outer periphery of the O-ring at a substantially equal angle in the circumferential direction, and three claws are provided on the expansion means, so one claw is inserted into each of the three gaps. The O-ring can be expanded in a substantially triangular shape with three claws.
[0006]
The O-ring removing device according to claim 3 is configured such that the pressing body that pressurizes the outer periphery of the O-ring is a cylindrical body or has a spherical tip, and thereby the O-ring is damaged. And pressurization can be effectively performed.
The O-ring removing device according to claim 4 has a pressing body as a rotating body, and by rotating the rotating body according to the elongation of the O-ring, the O-ring and the covered body can be moved without moving the load point. A gap with the assembly component can be formed.
[0007]
The O-ring removing device according to claim 5 is configured such that the pressing body has a predetermined length in the axial direction of the part to be assembled so that a plurality of O-rings arranged in parallel can be collectively removed. As a result, the O-ring removal work time can be greatly shortened.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an O-ring removing apparatus according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show a conceptual diagram of removal of an O-ring by the O-ring removal device of the present invention. That is, at two arbitrary points A and B on the outer periphery of the O-ring 2 fitted in the outer peripheral groove 1a of the cylindrical assembly part 1, the respective points A and B and the center C of the assembly part 1 Loads F1 and F2 are applied to the straight lines T1 and T2 passing through the angles θ1 and θ2, respectively. At this time, the angles θ1 and θ2 are θ1> arctan (1 / μ1) and θ2> arctan (1) assuming that the static friction coefficients between the O-ring 2 and the assembly part 1 on the straight lines T1 and T2 are μ1 and μ2, respectively. / Μ2). Here, as a loading method of the loads F1 and F2, for example, there is a method of pressing a pressing body having a cylindrical body or a spherical tip, or applying by a rotating body as a pressing body. In this case, the load points A and B may move during the load. The magnitudes of the loads F1 and F2 may be different, but the same magnitude is preferable.
[0009]
In this way, by applying the loads F1 and F2 from the load points A and B, the O-ring 2 is deformed so as to protrude upward in the drawing as shown in FIG. A gap g is formed between the part 1 and the part 1. As will be described later in detail, two or more claws provided in the expansion means are inserted into the gap g, and the interval between these claws is widened to expand the O-ring 2 and from the part 1 to be assembled. The O-ring 2 is removed.
[0010]
FIG. 3 shows one form of the O-ring removing device according to the embodiment of the present invention, and (a) to (d) are diagrams for explaining the work procedure. The O-ring removing device of the present invention includes a pressurizing means 3 that pressurizes the outer periphery of the O-ring 2 to form a gap g between the part 1 to be assembled and the O-ring 2, and the formed gap g And an extension means 4 for further expanding the O-ring 2.
[0011]
In the O-ring removing device shown in FIG. 3, the pressurizing means 3 includes a pair of processing hands 31, a pressing body 32 supported by one end of the pressurizing hand 31, and a pair of the pressurizing hand 31. The pressurizing hand 31 is rotatably connected to a connecting member 33, and a spring 34 is installed between the pair of pressurizing hands 31 at a substantially intermediate portion. The pressing body 32 may be fixed and attached to one end of the pressure hand 31 as a cylinder or a spherical tip, or may be pivotally attached to one end of the pressure hand 31 as a rotating body. Further, the pressing body 32 may be attached to the pressure hand 31 by cantilever support or may be attached by both-end support. In the case of supporting both ends, it is natural that the number of pressure hands 31 is increased by a corresponding number. Further, the pressing body 32 is preferably integrally formed of a material having a large friction coefficient, or the surface thereof is formed of a material having a large friction coefficient.
When the pressing body 32 is fixed and attached to the pressure hand 31, the load points A and B move according to the extension of the O-ring 2 due to the pressing of the pressing body 32, but the pressing body 32 is a rotating body. When configured, the rotating body simply rotates in accordance with the extension of the O-ring 2, and in this case, it is not necessary to move the load points A and B.
[0012]
The expansion means 4 includes a plurality of claws 41 inserted into the gap g and a removal hand 42 that holds these claws 41. In FIG. 3, the two claws 41 are held by the removal hand 42, but the holding member 42 may hold one claw 41.
[0013]
Next, the working procedure of the O-ring removal device will be described with reference to FIGS. In FIG. 3A, two pressurizations having two pressing bodies 32 symmetrically with respect to the center of the assembly part 1 on the outer periphery of the O-ring 2 fitted to the assembly part 1. Means 3 are arranged. In this state, a load is applied to each connecting member 33 from above and below by a known appropriate load device (not shown). This state is shown in FIG. At this time, the pair of pressurizing hands 31 gradually opens against the spring 34 so that the two pressurizing means 3 approach each other according to the extension of the O-ring 2, and the pressing of one pressurizing means 3 is performed. The body 32 moves downward, and the pressing body 32 of the other pressurizing means 3 moves upward, and two gaps g are formed between the O-ring 2 and the assembly part 1 at the center of the assembly part 1. On the other hand, it is formed substantially symmetrically.
[0014]
Next, two expansion means 4 having two claws 41 are prepared, and as shown in FIG. 3C, one claw 41 of the expansion means 4 is inserted into each of the two formed gaps g. The two expansion means 4 are arranged symmetrically with respect to the center of the part 1 to be assembled. In this state, the respective removal hands 42 of the two expansion means 4 are pulled by a known appropriate pulling device (not shown) so as to separate them. As a result, the O-ring 2 that is hooked on the four claws 41 of the two expansion means 4 is further expanded as shown in FIG. 3 (d) so that it does not completely contact the outer surface of the assembly part 1. become. Therefore, the O-ring 2 can be easily removed from the assembly part 1 without scratching.
[0015]
FIG. 4 is a view for explaining the concept of an O-ring removal device according to another embodiment of the present invention. In this case, the pressing means 3 having two pressing bodies 32 is used, and the points at which the two pressing bodies 32 act on the outer periphery of the O-ring 2 are indicated by loads F1 and F2 in FIG. . When these loads F1 and F2 act, a gap g is formed between the O-ring 2 and the part 1 to be assembled, and the three claws 41 of the expansion means 4 are inserted into the gap g. This state is shown in FIG. Thereafter, these three claws 41 are pulled in three different directions so as to increase the distance between them. As a result, as shown in FIG. 4B, the O-ring 2 expands into a substantially triangular shape and does not come into contact with the outer surface of the part 1 to be assembled.
[0016]
FIG. 5 is a view for explaining the concept of an O-ring removing device according to still another embodiment of the present invention. In this case, three sets of pressurizing means 3 each including two pressing bodies 32 are used, and are arranged on the outer periphery of the O-ring 2 at substantially equal intervals in the circumferential direction. In FIG. 5A, loads F1 and F2 are points at which one set of two pressing bodies 32 act, and loads F3 and F4 are points at which two sets of two pressing bodies 32 act. Loads F5 and F6 are points where two sets of two pressing bodies 32 act. As a result, three gaps g are formed between the O-ring 2 and the part 1 to be assembled, and the claws 41 of the expansion means 4 are inserted one by one into these gaps g. This state is shown in FIG. Thereafter, each of the claws 41 is pulled radially outward from the center of the part 1 to be assembled. As a result, as shown in FIG. 5B, the O-ring 2 expands into a substantially triangular shape and does not come into contact with the outer surface of the part 1 to be assembled.
[0017]
FIG. 6 is a view for explaining the concept of an O-ring removing device according to still another embodiment of the present invention. In the embodiment of FIG. 1, the case where one O-ring 2 is removed has been described. However, in this embodiment, as shown in FIGS. In the case where a plurality of O-rings 2 are fitted, these can be removed all at once. In this case, the shape of the pressing body 32 is predetermined in the axial direction of the assembly part 1 so that the loads F1 and F2 are simultaneously applied to the same positions on the circumference of the three O-rings 2 by the two pressing bodies 32, respectively. It is necessary to have a length. Therefore, it is preferable that the pressing body 32 has a cylindrical shape having a predetermined axial length. Of course, the individual pressing bodies 32 may be simultaneously applied so that the loads F1 and F2 are respectively applied to two predetermined points on the circumference of the three O-rings. FIG. 6B shows a state where gaps g are formed in the three O-rings 2 respectively. Although not shown, three or more claws 41 are inserted through these three gaps g, and the O-ring 2 is expanded as described above to remove the O-ring in a lump. Therefore, in this embodiment, the removal work time can be greatly shortened.
[0018]
In the above description, the pressurizing unit is described as having one set of two pressing bodies, but the pressurizing unit may be operated individually assuming that only one pressing body is provided. It is also possible to configure as a pressurizing means having all of a plurality of pressing bodies.
Similarly, as the expansion means, the holding member has been described as having two claws in FIG. 3, but the holding member has only one claw, and these claws are individually operated independently. It is also possible to adopt a configuration in which the expansion means has a plurality of all the claws.
In addition, when only one gap is formed as shown in FIGS. 2, 4 and 6, it is desirable that there are three or more nails, but as shown in FIGS. In the case where a plurality of claws are formed, one or two claws may be inserted into the respective gaps, the gap between the claws may be expanded, and as a result, the O-ring may be expanded.
[0019]
Furthermore, even when the O-ring is cut and removed from the assembled part, the method of creating a gap between the O-ring and the assembled part by loading the outer periphery of the O-ring, which is a feature of the present invention, is It is valid. That is, it can be removed without damaging the parts to be assembled by applying the cutting blade to the protruding part of the O-ring forming the gap and cutting.
[0020]
As described above, in the present invention, the O-ring and the parts to be assembled are not damaged, and the work time for removal can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of an O-ring removal device according to an embodiment of the present invention.
2 is a diagram illustrating a state in which a gap is formed between an O-ring and a part to be assembled in the apparatus of FIG.
FIG. 3 is a diagram illustrating operation steps (a), (b), (c), and (d) of an O-ring removal device according to one embodiment of the present invention.
FIGS. 4A and 4B are conceptual diagrams of an O-ring removing device according to another embodiment of the present invention. FIGS.
FIGS. 5A and 5B are conceptual diagrams of an O-ring removing device according to still another embodiment of the present invention. FIGS.
FIGS. 6A and 6B are views for explaining still another embodiment of the present invention when a plurality of O-rings are removed at the same time. FIGS.
FIG. 7 is a diagram for explaining a conventional method of removing an O-ring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Assembly part 2 ... O-ring 3 ... Pressing means 31 ... Pressing hand 32 ... Pressing body 33 ... Connecting member 34 ... Spring 4 ... Expansion means 41 ... Claw 42 ... Removal hand g ... Clearance

Claims (5)

In an O-ring removal device used to remove an O-ring assembled to a part to be assembled from the part to be assembled, this device comprises:
There is a pressing body that is pressed at a predetermined angle to at least two arbitrary points on the outer periphery of the O-ring assembled to the part to be assembled, and the O-ring is pressurized by applying a load to the pressing body. Pressure means;
Having the O-ring and write no two claws pointing into the gap between the assembled components formed by application of pressure to the O-ring by the pressurizing unit, the O-ring by expanding the distance between nail comrades Expansion means for further extending
If it is provided with a,
In the pressurizing means, two sets of the pressing bodies are provided symmetrically with respect to the part to be assembled with two as one set, and two sets of the expansion means having the two claws are provided similarly. O-ring removal device characterized by this. In an O-ring removal device used to remove an O-ring assembled to a part to be assembled from the part to be assembled, this device comprises:
There is a pressing body that is pressed at a predetermined angle to at least two arbitrary points on the outer periphery of the O-ring assembled to the part to be assembled, and the O-ring is pressurized by applying a load to the pressing body. Pressure means;
It has three claws inserted into the gap between the O-ring and the part to be assembled formed by pressurizing the O-ring by the pressurizing means, and the O-ring is further expanded by widening the gap between the claws. Expansion means to expand;
Comprising
In the pressurizing means, two sets of the pressing bodies are provided as one set, and three sets are provided at substantially equal angles in the circumferential direction on the outer periphery of the O-ring, and the expansion means has three claws. Features an O-ring removal device. The pressing body, O-ring removal device according to claim 1 or 2, characterized in that it has a cylindrical body or spherical tip. The pressing body, O-ring removal device according to claim 1 or 2, characterized in that the rotating body. The pressing body of the pressurizing means has a predetermined length in the axial direction of the part to be assembled so that the plurality of O-rings arranged in parallel can be pressed together. The O-ring removing device according to any one of claims 1 to 4 .

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