JP2008194799A - Tube material clamping tool, and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a means capable of securely gripping a tube material without damaging or deforming to prevent the generation of dust such as wear powder and the like and having excellent durability in a tube material composed of a fixed clamp and a moving clamp, in a tube material clamping tool gripping the tube material when an inner ring is pressed in. <P>SOLUTION: The tube material clamping tool has a posture switching means D capable of switching fixed and movable clamps 2a, 2b having tube material gripping surfaces 4a, 4b recessively formed in generally half-cylindrical shapes and the moving clamp 2b between an acting posture wherein a second tube material gripping surface 4b is disposed oppositely to a first tube material gripping surface 4a and a tube material 14 can be gripped between both the 4b, 4a; and a retracting posture wherein the first tube material gripping surface 4a is separated from the second tube material gripping surface 4 so as to freely put the tube material 14 in/out from the first tube material gripping surface 4a. Rough surface portions 8a, 8b with rough surfaces are formed on the first tube material gripping surface 4a and/or the second tube material gripping surface 4b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a clamp jig capable of pressure-holding a tube material such as a tree tube used in a semiconductor, medicine, biotechnology field, and the like. Specifically, an inner ring in a resin pipe joint is used as a resin tube material such as a fluororesin tube. The present invention relates to a tube clamp jig suitable for surrounding and holding an end portion of a resin tube material during press-fitting.

  As this type of tube clamp jig, for example, one used in an inner ring press-fitting device for a tube disclosed in Patent Document 1 is known. That is, it is a clamp jig comprising a fixed clamp 10 that is bolted to the apparatus main body 3 and a movable clamp 11 that is pivotally supported by the fixed clamp 10 via a spring pin 13 so as to be swingable and openable. The clamps 10 and 11 are provided with handles 14 and 15, and a lock lever 16 pivotally attached to one handle 15 is engaged with the other handle 14, so that the pipe material is interposed between the clamps 10 and 11. 1 can be gripped.

  The clamps 10 and 11 are formed with substantially semi-cylindrical clamp grooves (pipe gripping surfaces) 10a and 11a for enclosing and gripping the tube material 1, and after the movable clamp 11 is closed and swung. By operating the lock lever 16, the tube material 1 is held in the clamp grooves 10 a and 11 a, and is held by the press-fitting operation body 4 via the press-fitting body 5 at the end of the gripped pipe material. The inner ring 2 can be forcibly press-fitted.

  As can be seen from FIG. 4 of the cited reference 1, etc., in order to withstand the strong load in the axial direction acting on the pipe material 1 when the inner ring 2 is press-fitted, a rubber sheet is provided in each of the clamp grooves 10a and 11a. The friction materials 10b and 11b are attached so that the tube material 1 can be firmly gripped without being dented or damaged. As described above, an example in which a rubber non-slip member is provided on the gripping surface of the pipe material is also found in the tube joint construction apparatus disclosed in Patent Document 2.

As in Patent Documents 1 and 2, in the structure using rubber as a means for preventing slipping of the pipe material, there is a problem that the clamping force is reduced due to rubber wear, and the generation of rubber wear powder is a problem in use in a clean room. In addition to the inconvenience of degreasing, there is a problem that degreasing cleaning with an organic solvent cannot be performed from the viewpoint of chemical resistance of rubber. Therefore, it was tried to make it a non-slip means by forming some protrusions on the tube material gripping surface which is the above-mentioned clamp groove in a metal clamp without providing rubber, but this is a resin tube etc. There is a concern that large grip marks and scratches are easily attached to the outer surface of the tube, and there remains a problem in the safety of the tube material thereafter. As described above, there is still room for improvement in order to firmly grip the tube material without damaging it.
Japanese Patent Laid-Open No. 2-52723 Utility Model Registration No. 3090779

  An object of the present invention is to provide a means for firmly gripping a tube material without damaging or deforming the tube material in a tube material clamp jig which is composed of a fixed clamp and a movable clamp and can firmly grip the tube material when the inner ring is press-fitted. In addition, there is no generation of dust such as wear powder and the durability is improved.

The invention according to claim 1 is a pipe clamp jig,
A fixed clamp 2a having a first tubular material gripping surface 4a that is recessed in a substantially semi-cylindrical shape;
A movable clamp 2b having a second tubular material gripping surface 4b recessed and formed in a substantially semi-cylindrical shape;
The movable clamp 2b has a working posture in which the second tube material gripping surface 4b is disposed opposite to the first tube material gripping surface 4a so that the tube material 14 can be gripped between the two tube members 4b, 4a, and the first tube material of the tube material 14 And a posture switching means D that can be switched to a retracted posture in which the first tubular material gripping surface 4a is separated from the second tubular material gripping surface 4 so that the gripping surface 4a can be freely inserted and removed.
The first tube material gripping surface 4a and / or the second tube material gripping surface 4b are formed with rough surface portions 8a, 8b having a rough surface finish.

  According to a second aspect of the present invention, in the tube clamp jig according to the first aspect, the rough surface portions 8a and 8b are formed by blasting.

  The invention according to claim 3 is the tube clamp jig according to claim 1 or 2, wherein the surface roughness Ra of the rough surface portions 8a and 8b is set to 3 to 15 μm. .

  According to a fourth aspect of the present invention, in the pipe clamp jig according to any one of the first to third aspects, the fixed clamp 2a press-fits the inner ring 23 for resin pipe joint into the resin pipe 14. In the inner ring press-fitting device A, the rough surface portion 8a is configured to be fixed to the device main body 1 and within a predetermined range in the tube axis direction from the end on the inner ring arrangement side of each of the pipe material gripping surfaces 4a and 4b. , 8b are not formed.

  The invention according to claim 5 is the method of manufacturing a tube clamp jig according to any one of claims 1 to 4, wherein the rough surface portions 8a and 8b are formed by blasting using glass beads. It is a feature.

  The invention according to claim 6 is characterized in that, in the method for manufacturing a tube clamp jig according to claim 5, the glass beads having a particle size of 30 to 1100 μm are used.

  According to the first aspect of the present invention, since the rough surface portion having a rough surface finish is formed on one or both of the first and second tube material gripping surfaces, the friction coefficient between the rough surface portion and the outer peripheral surface of the tube material is increased. It is possible to resist the strong force in the tube axis direction accompanying the press-fitting of the inner ring without moving with respect to each clamp. This eliminates the need for conventional means for interposing a non-slip member such as rubber between the clamp jig and the tube material, thereby eliminating the possibility of generation of dust such as wear powder. As a result, a means for firmly holding the tube clamp jig, which consists of a fixed clamp and a movable clamp, and can firmly hold the tube material when the inner ring is pressed, without damaging or deforming the tube material is used. Thus, it can be provided in a state where it is improved so that it does not generate dust and has excellent durability.

  In this case, if the rough surface portion is formed by blasting as in claim 2, it is suitable for surface treatment of a concave surface such as a semicircular arc. Further, as described in claim 3, by setting the surface roughness Ra of the rough surface portion to 3 to 15 μm, the effect of the invention of claim 1 or 2 can be further enhanced (strong proof strength in the tube axis direction and It can be provided as a high scratch prevention function on the outer surface of the pipe material.

  By the way, when a strong tube axial direction force is applied to the tube material clamped by the tube material clamping jig, the tube material is clamped when the rough surface portion that generates a high frictional force is formed up to the inner ring arrangement side end. Stress is likely to concentrate on the non-clamped portion that follows the inner ring arrangement side end at the location, and there is a risk that an annular ridge is formed or crushing occurs at that location. Therefore, according to the fourth aspect of the present invention, since the rough surface portion is not formed in the predetermined range from the end on the tube gripping surface that receives the strong axial force, the rough surface portion at the clamped portion is formed. In a place where the above is not formed, each clamp and the tube material can be displaced in the tube axis direction by a strong tube axis direction force accompanying the press-fitting operation, and thus the stress concentration described above can be relaxed. As a result, the advantage that any one of the above-described effects according to the first to third aspects of the present invention can be achieved in a state where there is less fear of damaging the pipe material is added.

  According to the invention of claim 5, it is possible to provide a method for manufacturing a tube clamp jig capable of obtaining the effects of the inventions of claims 1 to 4 by adopting a method of performing blasting using glass beads. it can. In this case, if the glass beads having a particle diameter of 30 to 1100 μm are used as in the sixth aspect, the effect according to the fifth aspect of the invention can be suitably obtained.

  Hereinafter, an embodiment of a tube clamp jig according to the present invention will be described with reference to the drawings, taking an example applied to an inner ring press-fitting device into a resin tube. 1 to 8 are diagrams showing an inner ring press-fitting device and a tube clamp jig according to Example 1, and FIG. 9 is a graph showing the relationship between the particle size of glass beads used for blasting and the surface roughness of the rough surface portion. FIGS. 10 to 12 are views showing a tube clamp jig according to the second embodiment, and FIG. 13 is an image view showing an action of eliminating wrinkles.

  First, the resin pipe joint will be described. As shown in FIG. 8, each of the resin pipe joints T has a joint body 50 made of a resin excellent in chemical resistance and heat resistance, such as a fluororesin, a sleeve-like inner ring 23, and a union nut (press wheel). 51. The joint body 50 has a receiving port 52 at one end in the direction of the axis C, and a primary seal portion 53 in a state intersecting with the axis C of the joint body 50 is formed inside the receiving port 52. Is done. A secondary seal portion 54 that intersects the axis C is formed at the inlet of the receiving port 52, and a male screw 55 is formed on the outer periphery of the receiving port 52.

  The inner ring 23 is formed with a fitting portion 56 having an outer diameter that can be fitted to the receiving port 52 of the joint body 50 at the inner end portion in the axial direction, and has a mountain-shaped cross section at the outer end side in the axial direction. A bulging portion 57 is formed, and one end portion of the fluororesin tube 14 is expanded by press-fitting the end portion of the fluororesin tube (an example of a pipe material) 14 with the fitting portion 56 protruding outward. Thus, an inner end seal portion 58 that contacts the primary seal portion 53 of the joint body 50 is formed at the end of the fitting portion 56. On the other hand, an outer peripheral seal surface 59 that contacts the secondary seal portion 54 of the receiving port 52 is formed at a location corresponding to the bulging portion 57. The union nut 51 is formed with a female screw 60 that is screwed into the male screw 55 of the joint body 50.

  In order to connect the fluororesin tube 14 in the resin pipe joint T having the above-described configuration, the fluororesin tube 14 is inserted in the receiving port 52 of the joint body 50 with one end of the fluororesin tube 14 into which the inner ring 23 is press-fitted. The female thread 60 of the union nut 51 that has been loosely fitted to the outer periphery of the joint 14 is screwed into the male thread 55 of the joint body 50 and tightened. Accordingly, the inner ring 23 is pressed from the axial direction, and the inner end seal portion 58 and the outer peripheral seal surface 59 are brought into contact with the primary seal portion 53 and the secondary seal portion 54 of the receiving port 52 of the joint body 50, respectively. Thus, a pipe joint structure to which excellent sealing performance (sealing force) is imparted is provided.

  Next, the inner ring press-fitting device A and the tube material clamping jig 2 will be described. In FIG. 1, an inner ring press-fitting device A includes a clamp jig 2 that holds and holds a fluororesin tube 14 on the front end side in the front-rear direction of a metal apparatus body 1, and an inner ring 23 on the rear end side in the front-rear direction. The push-out mechanisms 3 are integrally arranged. As an outline of the action, the inner ring 23 that is fitted and held by the ring holder 20 is advanced by turning the grip 21, and the inner fitting 23 that is press-fitted to the end of the fluororesin tube 14 that is held by the pipe grip jig 2 is pressed. It is to let you. In the inner ring press-fitting device A, the tube clamp jig 2 side, which is the advancing direction of the inner ring 23, is defined as the front, and the extrusion mechanism 3 side is defined as the rear.

  The tube clamp jig 2 has a halved structure including a fixed clamp 2a and a movable clamp 2b. As shown in FIGS. 2 and 3, the fixed clamp 2 a is integrally mounted on the front end of the apparatus main body 1 by being formed integrally or by separate screwing or the like, and has a substantially semi-cylindrical shape on the upper portion thereof. It has the 1st pipe material holding surface (clamp groove) 4a recessedly formed. The movable clamp 2b has a second pipe material gripping surface (clamp groove) 4b formed in a substantially semi-cylindrical shape in the lower part thereof, and one side portion of the movable clamp 2b is one of the fixed clamps 2a. The upper and lower ends are pivotally connected to the side portions by hinge members 7 pivotally attached to the fixed clamp 2a and the movable clamp 2b by pins 5 and 6, respectively. The movable clamp 2b swings around the hinge member 7 to move to the fixed clamp 2a in a closed position (an example of an action position) indicated by a solid line in FIG. 2 and an open position (retracted position) indicated by a virtual line in FIG. The position can be freely switched over an example). Each of the pipe material gripping surface grooves 4a and 4b is finished to rough surface portions 8a and 8b formed by blasting.

  On the other side of the movable clamp 2b, a base end portion 9b of a lock body 9 having a hook portion 9a at the tip is pivotally mounted around the support shaft 10 so as to be vertically rotatable. Then, on the other side of the fixed clamp 2a, a short operating lever 12 having a gripping ball 11 at the tip is integrated with a middle portion of the eccentric cam shaft 13 having its base end 12b horizontally mounted on the fixed clamp 2a. By being inserted and coupled, it is attached around the eccentric cam shaft 13 so as to be rotatable up and down. Therefore, as shown in FIG. 3, after placing one end portion of the fluororesin tube 14 in a horizontal posture along the front-rear direction on the first tube gripping surface 4a of the fixed clamp 2a, the movable clamp 2b is closed and the lock body 9 is The hook portion 9a at the tip of this is suspended so as to be positioned below the eccentric cam portion 15 formed side by side with the base end portion 12b of the operation lever 12 on the eccentric cam shaft 13, and then the operation lever 12 is moved to the eccentric cam shaft. When the pivoting operation is performed in the downward direction P around 13, the eccentric cam shaft 13 rotates in the same direction, and the eccentric cam portion 15 integral with the eccentric cam shaft 13 rotates together. As the eccentric cam portion 15 rotates downward, as shown in FIG. 4, the eccentric cam portion 15 engages with the hook portion 9a of the lock body 9 to gradually tighten the lock body 9 downward. The movable clamp 2b can be locked in a closed position, that is, a state in which the fluororesin tube 14 is fastened and fixed.

  When the operation lever 12 is rotated upward from the locked state shown in FIG. 4, the eccentric cam portion 15 rotates in the same direction to release the engagement with the hook portion 9 a of the lock body 9. The movable clamp 2b can be opened upward from the fixed clamp 2a by rotating the lock body 9 upward.

  That is, the tube clamp jig 2 has a fixed clamp 2a having a first tube gripping surface 4a recessed in a substantially semicylindrical shape, and a second tube gripping surface 4b recessed in a substantially semicylindrical shape. The movable clamp 2a and the movable clamp 2b are arranged such that the second tube gripping surface 4b is disposed opposite to the first tube gripping surface 4a and the tube 14 can be gripped therebetween (the posture shown in FIG. 4), and the tube 14 can be switched to a retracted posture (the posture shown in FIG. 2) in which the first tube gripping surface 4a and the second tube gripping surface 4b are separated so that they can be freely inserted into and removed from the first tube gripping surface 4a. The first and second pipe gripping surfaces 4a and 4b are provided with rough surface portions 8a and 8b having a rough surface finish. The posture switching means D is composed of pins 5 and 6 and a hinge member 7 for swinging and opening the movable clamp 2b with respect to the fixed clamp 2a. The forced gripping mechanism 18 includes the lock body 9 and the operation lever 12. The eccentric cam shaft 13, the eccentric cam portion 15, and the like constitute an eccentric cam structure.

  As shown in FIG. 1, the push-out mechanism 3 includes a press-fitting action rod support portion 3A, and this 3A includes a female screw 3a formed of a resin such as polypropylene and made of a square screw or the like. Has been. The press-fitting action rod support portion 3A is fitted inside a ring portion 16 formed integrally with the rear end of the apparatus main body 1, is relatively fixed by a spring pin 17, and has a male screw 19a screwed into the female screw 3a. The press-fitting action rod 19 is threadedly inserted in a horizontal posture along the front-rear direction. A ring holder 20 is provided at the front end of the press-fitting action rod 19, and a bottomed cylindrical (or disc-shaped) grip 21 is integrally coupled to the rear end of the press-fitting action rod 19 using a bolt 22. ing.

  As shown in FIGS. 5 and 6, the ring holder 20 is formed of a low friction material such as a fluororesin, and has a hooked ring holding shaft portion 20a capable of inserting and holding the inner ring 23, and the ring holding shaft portion 20a. And a connecting shaft portion 20b projecting rearward from the central portion of the rear end surface, and is connected to the front end portion of the press-fitting rod 19 by a holder block 26 so as to be idled. The holder block 26 is made of a low-friction material such as a fluororesin, and has a cylindrical portion 24 having a male screw 24 a on the outer periphery and a flange portion 25 formed integrally with the front end of the cylindrical portion 24. The holder block 26 is inserted into the coupling shaft portion 20b of the ring holder 20 through a low-friction resin washer 27 made of fluororesin or the like so as to freely rotate and is coupled to protrude from the rear end of the cylindrical portion 24 of the holder block 26. A retaining ring 28 is fitted to the rear end portion of the shaft portion 20b so that the ring holder 20 does not come out of the holder block 26 forward.

  Accordingly, the male screw 24a of the cylindrical portion 24 of the holder block 26 is screwed into the female screw 29a of the female screw hole portion 29 provided in the center portion of the front end surface of the press-fitting action rod 19 and tightened. As a result, the holder block 26 is integrally screwed to the front end of the press-fitting action rod 19, and the ring holder 20 is connected to the press-fitting action rod 19 so as to freely rotate. Further, when the holder 25 is gripped and rotated in the direction opposite to the tightening direction, the holder block 26 and the ring holder 20 can be removed from the press-fitting action rod 19.

  According to the inner ring press-fitting device A having the above configuration, the inner ring 23 can be press-fitted into one end portion of the fluororesin tube 14 as follows. As shown in FIG. 6, the inner ring 23 is fitted and held on the ring holding shaft portion 20 a of the ring holder 20, and one end portion of the fluororesin tube 14 is held and fixed to the tube clamp jig 2, and then the grip 21 is fixed. The ring holder 20 is moved forward by rotating the grip press-fitting action rod 19. The inner ring 23 is press-fitted into one end portion of the resin pipe member 14 by the forward movement of the press-fitting action rod 19. At this time, the ring holder 20 is free to rotate in the holder block 26 at the front end of the press-fitting action rod 19, so that the inner ring 23 on the ring holder 20 moves forward without receiving the rotation of the press-fitting action rod 19, Therefore, the inner ring 23 does not twist the resin pipe 14.

  Then, as shown in FIG. 7, when the front end of the fitting portion 56 of the inner ring 23 is press-fitted to a predetermined depth where the end of one end of the fluororesin tube 14 comes into contact, the rotation operation of the press-fitting action rod 19 is stopped. Then, the press-fitting is finished. After completion of the press-fitting, when the press-fitting action rod 19 is reversely operated by the grip 21 and retracted to the original position, the ring holder 20 is extracted from the inner ring 23 press-fitted and integrated into one end of the fluororesin tube 14. be able to.

  The correct extraction procedure is to pull out the ring holder 20 from the inner ring 23 in the fluororesin tube 14 by retreating the press-fitting rod 19 in this way. The fluororesin tube 14 may be removed from the tube material clamping jig 2 while leaving the rod 19 in the forward state without being retracted, and the fluororesin tube 14 may be pulled out from the ring holder 20 by forcibly applying a rotational force. . Also in such a case, the ring holder 20 idles in the holder block 26 at the front end portion of the press-fitting action rod 19 and rotates together with the fluororesin tube 14, so that it is possible to prevent the fluororesin tube 14 from being twisted.

  When the inner ring 23 is press-fitted, it is desired to press-fit the shaft center of the fluororesin tube 14 and the inner ring 23 as closely as possible, so that the inner peripheral surface of the inner ring 23 and the ring holder 20 The outer peripheral surface is set to have a dimension with no gap between them, that is, approximately the same diameter. As the inner ring 23 is press-fitted, the inner peripheral surface of the inner ring 23 is in close contact with the outer peripheral surface of the ring holder 20, so the ring holder 20 must be pulled out of the inner ring 23 with a strong force. Even in such a case, since the ring holder 20 is attached to the holder block 26 via the retaining ring 28 in a retaining state, the ring holder 20 does not come out of the holder block 26, and the ring holder 20 is removed from the inner ring 23. Excellent workability.

  When the pipe diameters of the fluororesin tubes 14 to be targeted are different, the inner ring 23 having a diameter matching the diameter is used. In this case, as described above, the holder block 26 and the ring holder 20 are removed from the press-fitting action rod 19 by grasping the flange portion 25 of the holder block 26 and rotating it in the direction opposite to the tightening direction. What is necessary is just to replace | exchange for 23 and the ring holder 20 suitable for holding | maintaining this. Therefore, according to this, it is not necessary to replace the entire apparatus, and if the inner ring 23 and the ring holder 20 are replaced, the apparatus main body 1 including the other tube material clamping jig 2 and the press-fitting action rod support portion 3A. In addition, most of the apparatus such as the press-fitting action rod 19 and the holder block 26 can be shared.

  Fittings used in chemical supply lines such as semiconductors and liquid crystals do not like contamination of fine powder. Therefore, the ring holder 20 can be idled via a low friction resin washer 27. Thereby, even if the press-fitting work of the inner ring is repeated, generation of wear powder between the ring holder 20 and the holder block 26 can be suppressed as much as possible. In addition, since both or one of the ring holder 20 and the holder block 26 is formed of a low friction material such as fluororesin, the inner peripheral surface of the holder block 26 and the outer peripheral surface of the coupling shaft portion 20b of the ring holder 20 It is also possible to suppress the generation of wear powder between the two.

[Example 1]
Next, the tube clamp jig 2 and its details will be described. The surface treatment of the first and second tube gripping surfaces 4a and 4b in the clamps 2a and 2b of the tube clamp jig 2 will be described. As described above, each of the pipe material gripping surfaces 4a and 4b is finished to the rough surface portions 8a and 8b by a finishing process by blasting. In the finishing step, glass bead blasting using a large number of glass beads having a particle size of 30 to 1100 μm is performed, and each tube material gripping surface 4a and 4b has rough surface portions 8a and 8b having a surface roughness Ra of 3 to 15 μm. Finished.

  FIG. 9 shows a graph showing the relationship between the surface roughness Ra of the rough surface portions 8a and 8b, which are finishing surfaces, and the glass bead particle size. From the results of experiments and the like, when the inner ring 23 is press-fitted into the fluororesin tube 14 using the inner ring press-fitting device A, the fluororesin tube 14 is prevented from slipping and is gripped on the outer peripheral surface of the fluororesin tube 14. It can be seen that the condition that the surface roughness Ra is 3 μm or more and 15 μm or less is necessary to prevent the scratches. And in order to obtain the suitable surface roughness of 3 μm ≦ Ra ≦ 15 μm, it can be understood that the particle size of the glass beads may be set to 30 μm to 1100 μm. In this case, as can be seen from the relationship graph of FIG. 9 (portion indicated by hatching by test data), the larger the particle size of the glass beads used in the blasting of the finishing process, the more the surface roughness Ra of the rough surface portions 8a and 8b. There is a correlation that the larger the glass bead particle size is, the smaller the surface roughness Ra of the rough surface portions 8a, 8b is.

[Example 2]
The tube clamp jig 2 may be one according to the second embodiment shown in FIGS. The tube clamp jig 2 according to the second embodiment includes a fixed clamp 2a that is placed on the apparatus main body 1 and fixed by two longitudinal bolts, and a movable clamp that is pivotally supported to swing open / close with respect to the fixed clamp 2a. 2b and this pipe clamp jig 2 are basically the same as those of the first embodiment except that the shape, the details of the forceful gripping mechanism 18, the mounting structure to the apparatus main body, etc. are slightly different. It is assumed that the parts are described by giving the same reference numerals.

  The fixed clamp 2a, whose vertical dimension is larger than that of the movable clamp 2b, has an eccentric cam shaft 13 in the recessed portion 30 formed on the left and right sides at the end on the inner ring arrangement side (arrow A side). A lock body 9 that is externally fitted to the eccentric cam portion 15 so as to be rotatable relative to the eccentric cam portion 15 is swingably disposed, and the corresponding recessed portion 31 of the movable clamp 2b is engaged with the hook portion 9a at the distal end of the lock body 9. A possible spindle 10 is implanted. That is, by swinging the operating lever 12 with the hook portion 9a engaged with the support shaft 10, the force applied to the operating lever 12 is amplified by this principle, and the movable clamp 2b is fixed to the fixed clamp 2a. The fluororesin tube 14 interposed between the clamps 2a and 2b can be pressed and firmly gripped, and a forced gripping mechanism 18 is constituted by these.

  And the rough surface parts 8a and 8b by the method similar to the thing of Example 1 are formed in each pipe material holding surface 4a and 4b. However, the rough surface portions 8a and 8b are not formed in a predetermined range (range h shown in FIG. 12) in the tube axis direction from the end on the inner ring arrangement side of each tube material gripping surface 4a and 4b. That is, when the inner ring 23 is press-fitted and the axial force acting on the fluororesin tube 14 clamped by the tube clamp jig 2 is abnormally strong, the tube gripping surfaces 4a, 4b In the conventional case where the inner ring arrangement side ends are the rough surface portions 8a and 8b because all of them are the rough surface portions 8a and 8b or the like and a non-slip member such as a rubber sheet is interposed, for example, FIG. As shown to (a), there exists a possibility that the jig | tool side edge part of the part which is not clamped in the press injection side of the fluororesin tube 14 may raise | generate the annular | circular shape, and it will be easy to raise | generate the bending deformation used as a wrinkle.

  On the other hand, in the configuration of the second embodiment, the portion without the rough surface portions 8a and 8b has a low frictional resistance, and is relatively slippery with the pipe material gripping surfaces 4a and 4b even when being forcedly gripped (the rough surface portions 8a and 8b). 8b), the fluororesin tube 14 can be slid and moved at the portions where the rough surface portions 8a and 8b are not present on the pipe material gripping surfaces 4a and 4b, and the above-described stress concentration is avoided. As a result, as shown in FIG. 13 (b), the rough surface portions 8a and 8b can continue to clamp the fluororesin tube 14 securely without slipping, and continue to the inner ring arrangement side end of the fluororesin tube 14. An excellent tube clamp jig that can avoid deformation and damage of the part (unclamped part) at a higher level has been constructed.

[Another Example]
The rough surface portions 8a and 8b may be formed only on the first tube material gripping surface 4a, or may be formed only on the second tube material gripping surface 4b, or may be formed partially. In addition, since the frictional resistance is increased due to the presence of the rough surface portions 8a and 8b, the area itself of each tube material gripping surface 4a and 4b is reduced, that is, the width dimension (thickness in the tube axis direction) as the tube material clamping jig 2 is conventionally reduced. It is also possible to make it thinner. Further, the tube clamp jig 2 can be constituted by a single fixed clamp 2a and two or more movable clamps 2b.

Side view of partially cutout showing the structure of the inner ring press-fitting device Front view of the inner ring press-fitting device of FIG. Sectional view showing structure of tube clamp jig (Example 1) Sectional drawing which shows the state which hold | gripped the resin pipe material with the pipe clamp jig Side view of a notch showing the front end of the press-fitting rod and the ring holder Action diagram showing the start of press-fitting into the inner ring pipe Action diagram showing the end of press-fitting into the inner ring pipe Sectional drawing of the principal part which shows the structural example of resin pipe fittings A graph showing the relationship between the surface roughness of the tube gripping surface and the particle size of the glass beads A perspective view of a tube clamp jig showing another finished state of the tube gripping surface (Example 2) The top view of the 1st pipe material holding surface in the fixed clamp shown in FIG. The top view of the principal part which shows the pipe material holding surface of the fixed clamp of FIG. (A) Image diagram showing the formation of an annular ridge due to inner ring press-fitting, (b) Image diagram showing the action during press-fitting when there is no rough surface portion on the inner ring placement side end

Explanation of symbols

2a Fixed clamp 2b Movable clamp 4a 1st pipe material holding surface 4b 2nd pipe material holding surface 8a, 8b Rough surface part 14 Pipe material 23 Inner ring A Inner ring press-fit apparatus D Posture switching means

Claims (6)

A fixed clamp having a first tube gripping surface recessed into a substantially semi-cylindrical shape;
A movable clamp having a second tubular material gripping surface recessed into a substantially semi-cylindrical shape;
The movable clamp has a working posture in which the second tube material gripping surface is disposed opposite to the first tube material gripping surface so that the tube material can be gripped therebetween, and the tube material can be inserted into and removed from the first tube material gripping surface. And a posture switching means switchable to a retracted posture in which the first tube material gripping surface and the second tube material gripping surface are separated from each other,
A tube clamp jig in which a rough surface portion having a rough surface finish is formed on the first tube material gripping surface and / or the second tube material gripping surface.   The tube clamp jig according to claim 1, wherein the rough surface portion is formed by blasting.   The tube clamp jig according to claim 1 or 2, wherein a surface roughness Ra of the rough surface portion is set to 3 to 15 µm.   The fixed clamp is equipped on a device body in an inner ring press-fitting device for press-fitting an inner ring for resin pipe joints into a pipe made of synthetic resin, on the inner ring arrangement side of each pipe material gripping surface. The tube clamp jig according to any one of claims 1 to 3, wherein the rough surface portion is not formed in a predetermined range from the end portion in the tube axis direction.   It is a manufacturing method of the pipe clamp jig as described in any one of Claims 1-4, Comprising: The manufacturing method of the pipe clamp jig which forms the said rough surface part by the blast process using a glass bead.   The method for manufacturing a tube clamp jig according to claim 5, wherein the glass beads having a particle size of 30 to 1100 μm are used.

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