JPS58119427A - Multiple spindle automatic tube expanding device - Google Patents

Abstract

PURPOSE:To perform tube expanding work efficiently by detecting presence of tube plate hole and retreating automatically the expander where there is no tube plate hole in expanding a tube by the expander of a multiple spindle expanding device for manufacturing a heat exchanger. CONSTITUTION:Many tube plate holes 3 are pierced on the tube plate 1 of a heat exchanger. Tubes 2 are inserted into the holes, and the tube plate holes 3 are expanded and stuck fast in a body the tube plate 1. In this case, expanders 101a, 101b of the multiple spindle automatic expanding device are inserted into expanded parts 2a1, 2b1 of tubes 2a, 2b to perform normal expanding. An expander 101c comes into contact with the end face of the tube plate 1 where there is no tube plate hole, and its advance is stopped. At this time, a retreating relay is operated by a limit switch, and the expander 101c is retreated automatically. As the expander corresponding to the plate face where there is no tube plate hole is retreated by automatic control, selection of expander corresponding to the tube plate hole becomes unnecessary, and expanding operation can be performed at high work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-axis automatic tube expansion device used in heat exchanger manufacturing equipment.

An example of a conventional heat exchanger is explained with reference to FIGS. 1 and 2. In a tube sheet 1, tube sheet holes 3 are arranged in a pattern and at equal pitches, and tubes are inserted into the tube sheet holes 3. 2 has been inserted. This tube 2 is expanded by an expander (not shown) K of a roll expansion device or a hydraulic tube expansion device, and is integrally connected to the tube plate 1 in close contact with it. Note that portions A to H in the figure indicate portions in which no tube plate holes are provided.

The above tube expansion device is an NC control system that uses an NC control device to position the expander so that its center coincides with the center of the tube sheet hole 3 of the tube sheet 1, and automatically and continuously performs the tube expansion work in sequence. It is well known that automatic axial tube expansion devices are commercially available.

To explain the NC-controlled multi-axis automatic tube expansion device with reference to FIG. 3, a lower frame 13 is provided on the slide head 11 so as to be movable in the left and right (X-axis) direction via a moving device 12. is connected to the upper frame 14 by four guide columns 15. This guide post 15
An intermediate frame 17 is attached to the frame 17 so as to be movable in the vertical (Y-axis) direction by a moving device 16. On the intermediate frame 17, a tube expansion head section 19 having a plurality of expanders 18, a motor 20 for rotating the expanders 18, a rotary torque transmission shaft 21 connecting the motor 20 and the tube expansion head section 19, and the expanders 18 are individually installed. A drive device 22 for moving in the front and back (two-axis) direction is installed.

The drive devices 12 and 16 are moved horizontally and vertically according to instructions from the NC tape, and the intermediate frame 17
Move the upper expander 18 to the center of the tube plate hole at the starting position. The expander 18 is rotated by a motor 20 driven according to instructions from the NC tape, and is advanced via a drive device 22. For this reason, the expander 18 is inserted into the tube 2 (see FIG. 2) inserted into the tube plate hole 3 and begins to expand, and when the expander 18 reaches a predetermined rotational torque, the expansion is completed. The expander that has completed the expansion in this way is moved back by the drive device 22, and after all the expanders are moved back, the center of the expander is moved back to the drive device 12.1.
6, the tube is moved to the next tube expansion position.

From then on, the process proceeds according to a preset pattern using the same procedure as above. However, if you mistakenly specify a part without tube plate holes, the expander 18 moves to the drive device 12 as instructed by the NC tape. .16 to a position where there is no tube plate hole, and is rotated by a motor 20 and advanced by a drive device 22. The expander 18 is then stamped onto the surface of the tubesheet without tubesheet holes and maintained in a rotating state.

In such a state, the pipe expansion cannot be completed because a predetermined rotational torque is not generated as in the case of pipe expansion.

For this reason, when a normal automatic tube expansion device elapses for 20 to 30 seconds without generating rotational torque, it issues an alarm for tube expansion abnormality, stops the motor 20, and operates the entire system while being retracted by the drive device 22. It is equipped with a safety device that stops automatic operation in an emergency.

Therefore, in the case of an emergency stop, the automatic pipe expansion device must be restarted after the operator confirms the cause of the abnormal stop, so the automatic pipe expansion device must be constantly monitored. effect may be halved.

Further, in the NC-controlled multi-axis automatic tube expansion device, it is necessary to give control commands such as selection and positioning of the expander shaft corresponding to the tube plate hole in the tube plate using NC tape or the like in advance. For a tube sheet 1 where the tube sheet holes 3 are arranged in a complicated pattern as shown in FIG. 1, or a tube sheet with circular holes (not shown), etc. It is not easy to pick out the hole positions, select the corresponding expander shaft, and create an NC tape.

Also, each time the hole arrangement of the heat exchanger changes, the NC
Since tapes have to be created, factories that produce a wide variety of products in small quantities require a large number of NC tape creators. Furthermore, if you make an NC tape with even one wrong instruction, the automatic tube expansion operation using that tape will stop at that position, or the tube will move to the next hole position without performing the tube expansion operation and the tube will be marked as unexpanded. Become. For this reason, automatic tube expansion work was normally carried out after confirming whether there were any errors in tape creation, so the advantage of introducing an N, C-controlled multi-axis automatic tube expansion device is speed-up and labor-saving. The disadvantage is that the effectiveness is significantly reduced.

In view of the above, an object of the present invention is to provide a multi-axis automatic tube expansion device that can save labor and increase speed even in high-quality, low-volume production. The present invention is characterized in that when no hole is provided, this is automatically detected and the expander corresponding to the tubesheet surface without the tubesheet hole is automatically retracted via a control circuit and a drive mechanism. It is something to do.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 4 and 5, 101 is the shaft 103
The shaft 103 passes through a bearing block 104 with the expander held by a gripped mandrel 102 connected via a tapered shank (not shown) to the
Universal joint 105 and spline 106
It is connected to the motor 20 via. The bearing block 104 is installed on a slide plate 108 provided on a slide block 107, and is movable by rotation of a screw 109.

A cylinder 11 is installed at the rear of the upper rudder slide block 107.
0, a shaft 112 having a slide par 111 and a dog 113 are connected, and the slide block 107 is slid by the cylinder 110 and slide par 111. The dock 113 can be moved to any position on the shaft 112 by loosening the screw 115, and the limit switch 11 can be moved to any position on the shaft 112 by loosening the screw 115.
4 is opened and closed.

The limit switch 114 is connected to the timer relay 116KiIf column as shown in FIG. 6(m), and the contact 116a of the timer relay 116 is
It is connected in series with a retracting sea 117 provided in parallel with 6. In this way, a control circuit A is formed by connecting the limit switch 114, timer relay 116, timer relay contact 116a, and reverse relay 117. As shown in FIG. 5 (III), the limit switch 114 is set so that the dog 113 is turned on when the tip of the expander 1010 comes into contact with the end surface of the tube sheet 1.
The position is adjusted and set. It is assumed that such adjustment is performed for all axes 112 (three axes in the figure).

Next, the operation of this embodiment configured as described above will be explained.

In actual automatic tube expansion work, the two expanders 1012 and 101b are inserted into the tube expansion parts 2a1 and 2b of the tubes 2a and 2b to carry out regular tube expansion, as shown in (I) (1) in FIG. However, the expander 101C (Ill) in the same figure comes into contact with the end surface of the tube sheet 1 without tube sheet holes and is stopped from moving forward. In such a state, the limit switch 114 is turned on by the dock 113, and after a certain period of time, the contact 116a of the timer relay 11111i is closed.
will also be introduced. For this reason, the reverse relay 117 is activated, so the expander 1 corresponding to this reverse relay 117
010 is retracted.

In this case, when the expander enters the tube expansion hole, the setting time of the timer 116 is set as the passing time (0
, about 5 seconds), the presence or absence of a tube plate hole can be detected by replacing the opening/closing time of the limit switch 114 with the opening/closing time of the limit switch 114. Furthermore, if this device is used as a slit-like gap and the detection is carried out using a phototube, the passage time can be shortened, and the time for hitting the tube plate surface and retreating can be shortened.

Additionally, a proximity switch sensor may be incorporated into the tip of the expander and actuated to retract the expander when the sensor approaches a surface of the tubesheet without tubesheet holes.

The method for detecting the presence or absence of a tube plate hole as described above makes it possible to distinguish it from conventional tube expansion abnormalities, and allows the automatic tube expansion device to automatically move and position to the next tube expansion hole without stopping due to tube expansion abnormalities. can.

As explained above, according to the present invention, the presence or absence of tubesheet holes is automatically detected, and the expander corresponding to the tubesheet surface without tubesheet holes is automatically retracted via the control circuit and drive mechanism. This allows automatic tube expansion by specifying the expander for each axis from the beginning, regardless of the presence or absence of tube plate holes. In other words, since the conventional axis selection is no longer necessary, the NC tape can be created by simply instructing the positioning movement of the tube expansion head. Therefore, as the number of axes increases, the effect of not requiring axis selection becomes even more significant, and it is possible to save manpower and increase speed even when producing tonics of a wide variety and in small quantities.

Further, even if the tube plate hole within the range of movement of the expander is eliminated due to change, or if a tube plate hole is provided where there was no tube plate hole, the NC tape can be used without changing.

For example, when expanding a tube plate hole shown in Figure 1, if you instruct a positioning operation that covers the X and Y range, the tube will be expanded only where the tube plate hole is, and the expander will not work in areas A-H where there is no tube plate hole. There is no automatic retraction and expansion.

Therefore, even a sequential control device other than the conventional NO control device can exhibit similar effects, so it is possible to provide an inexpensive and efficient multi-axis automatic tube expansion device.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a tube plate of a heat exchanger, Fig. 2 is a sectional view taken along the line T in Fig. 1, Fig. 3 is a perspective view of a conventional multi-axis automatic tube expansion device, and Fig. 4 is a diagram of the present invention. FIG. 5 is a sectional view showing the tube expansion state of the embodiment, and FIG. 6 is a control circuit diagram of the embodiment. 1...Tube sheet, 2...Tube, 3...Tube sheet hole, 1
01... Expander, 102... Mandrel,
110...Cylinder, 111...Slide bar, 1
14...Limit switch, 116...Timer relay, 117...Reverse relay. (11) Go 5 Figure-143- Figure B

Claims (1)

[Claims] 1. A multi-axis automatic tube expansion device in which tubes are inserted into a large number of tube plate holes provided in a tube plate, and the tube plate and tubes are brought into close contact with each other through an expander to connect them together. The multi-axis automatic system is characterized in that the presence or absence of the tubesheet hole is automatically detected, and the expander corresponding to the tubesheet surface without the tubesheet hole is automatically retracted via a control circuit and a drive mechanism. Tube expansion device. 2. The control circuit includes a limit switch, a timer relay, and a retraction relay, and operates the limit switch when the mantle tip of the expander approaches or contacts a tube plate surface without a tube plate hole. Claim 1, characterized in that the reverse relay is operated via a relay.
Multi-axis automatic tube expansion device as described in section.