JPH0115480Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a type of bite-type pipe joint in which a pipe is connected to the main body using a sleeve and a cap nut. This invention relates to a pre-assembly device for a pipe joint that is pre-embedded in a predetermined position to facilitate and ensure the work when tightening the pipe joint.

[Conventional technology]

As shown in FIG. 1, the above-mentioned joint includes a main body 1 having a tapered opening that expands outward;
A cap nut 2 having a tapered pressing surface that expands toward the main body 1, and the main body 1 and the cap nut 2.
The sleeve 4 is fitted around the outer periphery of the pipe 3 so that both ends are in contact with both tapered surfaces of the pipe 3.The pipe 3, which has passed through the cap nut 2 and the sleeve 4, is inserted into the main body 1, and the main body 1 is inserted into the cap nut. The diameter of the sleeve 4 is reduced in the inner diameter direction by the pressing force of the tapered surfaces of both members due to the screw engagement with the pipe 2, and the sleeve 4 is bitten into the outer peripheral surface of the pipe 3 to maintain airtightness and resist coming out. It is.

By the way, in this type of pipe joint, in order to make the tightening work easier and more reliable, the sleeve 4 is embedded in the outer circumferential surface of the pipe 3 in advance, and the sleeve and pipe are preassembled. There is.

FIGS. 2 and 3 are a plan view and a vertical sectional view showing a conventional preassembly device. In the drawing, reference numeral 5 denotes a machine base of the pre-assembly device, in which a cam shaft 8 with a cam 7 integrally attached thereto is rotatably fitted and supported in a shaft hole 6 drilled near the right end of the drawing. is the mounting bracket 9
A handle 10 is integrally attached via the handle.

Reference numeral 11 denotes a through hole 12 bored in the center of the machine base 5.
The piston is slidably inserted into the piston, and its rear end is in elastic contact with the cam 7 via a cam follower 14 by a spring 13. 15 is the piston 11
As shown in Fig. 4, this is a pre-assembly jig attached to the tip of the pipe 3, which has a stepped portion 15a for fitting and abutting the end of the pipe 3, and a diameter that gradually increases from this stepped portion 15a toward the end surface. It has a tapered surface 15b. 16
is a nut receiver provided at the left end of the machine base 5 in the figure, and has a notch 17 that can be inserted from above while keeping the vicinity of the pipe end of the pipe 3 horizontal.

Next, the operation of the apparatus having the above configuration will be explained. First, rotate the handle 10 counterclockwise in FIG. 2 so that the small diameter part of the cam 7 faces the cam follower 14, leave a sufficient distance between the nut receiver 16 and the tip of the piston 11, and attach the pre-assembled part to the tip of the piston 11. Attach jig 15. Next, the pipe 3 with the cap nut 2 and sleeve 4 fitted to the end is inserted into the notch 17 of the nut receiver 16 so that the back surface of the cap nut 2 is inserted into the nut receiver 16.
Insert it so that it is in contact with the Thereafter, when the handle 10 is rotated clockwise in FIG. Moving forward in the left direction in the figure, the step portion 15a of the preassembly jig 15 comes into contact with the end surface of the pipe 3. Then, when the handle 10 is further rotated, the pre-assembly jig 15 is pushed and the pipe 3 is moved, and eventually the tapered surface 15b of the pre-assembly jig 15 is moved.
pushes the rear end of the sleeve 4, and the sleeve 4, whose front end is in contact with the tapered surface of the cap nut 2, is pressed and bites into the outer peripheral surface of the pipe 3, and the sleeve 4 bites into the pipe 3 sufficiently. The preliminary assembly work is then completed.

By the way, since the above-mentioned conventional preassembly apparatus is a manual type in which the handle 10 is manually rotated, the operation is extremely inefficient and labor-intensive, resulting in a high degree of fatigue for the operator. In addition, if the tightening force was manual, the tightening force was not constant, resulting in variations in the amount of tightening.

[Purpose of invention]

This invention aims to provide a pipe joint preassembly device that saves labor and improves work efficiency by mechanizing the above-mentioned preassembly work that was previously performed manually.

[Structure of the idea]

This idea has the same shape as the mouth end of the pipe joint body,
The outer diameter of the pipe fitting nut is smaller than the inner diameter, and the inner surface of the opening end has a stepped portion into which the end of the pipe fits and comes into contact, and a stepped portion on the pipe that gradually increases in diameter from the stepped portion toward the opening end. a preassembly jig having a tapered surface into which the end face of the sleeve is fitted and abutted; a piston having the preassembly jig detachably attached to the tip thereof and elastically capable of sliding backward; A cam which is disposed at the rear end and is in elastic contact with the piston via a cam follower, and which is capable of supporting the end portion of the pipe and supports the end face of the pipe fitting nut fitted into the end portion of the pipe. , in a pipe joint preassembly device comprising the preassembly jig and a nut holder provided with the same axis, a dog is provided on the cam, and the preassembly is carried out on the rotational track of the dog; The gist of the present invention is that a stopper for determining the preassembly completion position is provided at the completion position, and a preassembly completion position detecting means is provided at the lower end of the rotating shaft of the rotational drive means for the cam.

〔Example〕

FIGS. 5 and 6 are a plan view and a partially sectional front view showing an example of a pipe joint preassembly apparatus according to the present invention. In the drawing, 18 is frame 1
9, one end (right side in the figure)
A cam shaft 21 is rotatably inserted and supported in a shaft hole 20 bored in the
2 are attached together. 23 is the camshaft 21
For example, the upper end of the rotating shaft 24 is connected to the camshaft 21 via the universal joint 25 using a driving means such as an air high rotor using air as a driving source (normal motor: forward/reverse switchable, hydraulic motor). It is connected. A piston 26 is slidably inserted and supported in the center of the machine base 18, and its rear end is supported by a spring 2.
7 is in elastic contact with the cam 22 via the cam follower 28. 29 is a pre-assembly jig attached to the tip of the piston 26, which has a stepped portion 29a for fitting and abutting the end of the pipe 3 as in the conventional case, and a diameter that gradually increases from this stepped portion 29a toward the end surface. It has a tapered surface 29b. 30 is a nut holder provided at the other end of the machine base 18 (the left end in the figure), and the pipe 3
It has a notch 31 that can be inserted from above while keeping the vicinity of the tube end horizontal. A dog 32 is made of a super hard material and is integrally installed on the lower surface of the cam 22 via a fitting 33. Reference numeral 34 denotes a positioning stopper for the pre-assembly starting position, which is slidably mounted on the machine frame 19 via a mounting base 35 at a predetermined position on the rotational track of the dog 32. Reference numeral 36 denotes a positioning stopper for the pre-assembly completion position, which is fixed via a mounting base 37 at a predetermined position on the rotational track of the dog 32.

A detector 38 is fixed to the lower end of the rotating shaft 24 of the air high rotor 23, and is configured to operate the proximity switch 39 at the preliminary assembly completion position C.
That is, the detector 38 and the proximity switch 39 constitute a preliminary assembly completion position detecting means. Note that points A, B, and C of the cam 22 are a preassembly starting point, a preassembly starting point, and a preassembly completion point, respectively.

Next, the operation of the pipe joint preassembly device having the above configuration will be explained.

First, prior to the preliminary assembly work, the cam 22 and the preliminary assembly jig 29 are adjusted in advance. That is, while the cam follower 28 provided at the rear end of the piston 26 is in elastic contact with the point A of the cam 22 as shown in FIG. 5, the preliminary assembly jig 29 is attached to the tip of the piston 26, and 2 bag nuts at the end
and pipe 3 fitted with sleeve 4 into nut holder 30
The cap nut 2 is fitted into the notch 31 in such a way that the back side of the nut 2 contacts the nut receiver 30. Next, the mounting base 35 is slid with respect to the frame 19 to position the positioning stopper 34 at the preliminary assembly start position on the rotational trajectory of the dog 32. After this, air high rotor 23
When the cam 22 is started and the cam 22 is rotated in the forward direction (clockwise in FIG. 5), the dog 32 attached to the cam 22 via the mounting bracket 33 rotates together with the positioning stopper 34 at the pre-assembly starting position at a predetermined position. , and the cam 22 stops rotating. At this time, the positioning stopper 34 is adjusted so that the cam follower 28 comes into elastic contact with the cam 22 at point B, and
As shown in FIG. 7, the end surface of the pipe 3 is in contact with the stepped portion 29a of the preassembly jig 29, and both end surfaces of the sleeve 4 on the pipe 3 are in contact with the tapered surface 29b of the preassembly jig 29 and the cap nut. 2, and the outer end surface of the cap nut 2 is in contact with the nut receiver 3.
Adjust the pre-assembly jig 29 so that the cap nut 2 contacts the pipe 3 with no play in the axial direction of the pipe 3. When this is completed, the air high rotor 23 rotates the cam 22 in the opposite direction (counterclockwise in FIG. 5) to return it to the starting point A, and the mounting base 35 is moved back to retract the positioning stopper 34 to complete the preliminary adjustment. . After the preliminary adjustment is completed, air high rotor 2
3 to rotate the cam 22 in the forward direction. Then, the piston 26, which is in contact with the cam 22 via the cam follower 28, moves forward in the left direction in the figure against the elastic pressing force of the spring 27. Then, when point B of the cam 22 contacts the cam follower 28, the seventh
As shown in the figure, the stepped portion 29a of the preassembly jig 29 comes into contact with the end surface of the pipe 3. When the cam 22 further rotates, the tapered surface 29b of the pre-assembly jig 29
pushes the rear end of the sleeve 4, and the sleeve 4, whose front end is in contact with the tapered surface of the cap nut 2, is pressed and bites into the outer peripheral surface of the pipe 3, and the C point of the cam 22 reaches the cam follower 28. Then, the 8th
As shown in the figure, the sleeve 4 is fully inserted into the pipe 3. Also, point C of the cam 22 is located at the cam follower 2.
8, the dog 32 comes into contact with the positioning stopper 36 at the pre-assembly completion position, the rotation of the cam 22 stops, and at the same time the pre-assembly is completed, the detector 38 fixed to the lower end of the rotating shaft 24 of the air high rotor 23
Activate the proximity switch 39 with
The air high rotor 23 is rotated in the opposite direction by an electric signal, and the cam 22 is rotated in the opposite direction, returning to the starting point A to complete the pre-assembly work.

[Effect of idea]

According to this invention, by mechanizing the pre-assembly work that was previously done manually, it is possible to save labor and improve work efficiency, and since the final position of the pre-assembly is constant, it prevents variations in the amount of tightening. can do.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of a half part of a pipe joint, Figure 2 is a plan view showing a conventional manual preassembly device, Figure 3 is a vertical front view thereof, and Figure 4 is an enlarged sectional view of a preassembly jig. , FIG. 5 is a plan view showing the pre-assembly device for a pipe joint according to this invention, FIG. 6 is a partially sectional front view, and FIGS. 7 and 8 show the bag immediately before pre-assembly and after completing pre-assembly, respectively. It is a drawing showing the relationship between a nut, a pipe, a sleeve, and a preassembly jig. 1... Pipe joint body, 2... Cap nut, 3... Pipe, 4... Sleeve, 22... Cam, 23...
Air high rotor, 26... Piston, 29... Pre-assembly jig, 30... Nut holder, 32... Dog,
36...Positioning stopper for pre-assembly completion position,
38...Detector, 39...Proximity switch.

Claims (1)

[Scope of utility model registration request] It has the same shape as the opening end of the pipe fitting body, the outer diameter is smaller than the inner diameter of the pipe fitting nut, and the inner surface of the opening end has a
a pre-assembly jig having a stepped portion into which the end of the pipe is fitted and brought into contact; and a tapered surface which gradually becomes larger in diameter from the stepped portion toward the open end and into which the end surface of the sleeve on the pipe is fitted into and brought into contact; A piston having a pre-assembly jig removably attached to its tip and elastically capable of sliding backward, and a cam disposed at the rear end of the piston and bringing the piston into elastic contact via a cam follower. , a nut holder that is capable of freely supporting the end portion of the pipe and that supports the end face of the pipe fitting nut fitted into the end portion of the pipe, and that is provided with an axis aligned with the pre-assembly jig. In a pre-assembly device for a pipe joint, a dog is provided on the cam, and the dog is placed on the rotational trajectory of the dog, and
A preassembly device for a pipe joint, characterized in that a preassembly completion position positioning stopper is provided at the preassembly completion position, and a preassembly completion position detection means is provided at the lower end of the rotation shaft of the rotational drive means for the cam.