JP3179932U - Manual cart for strain relief heating - Google Patents

Abstract

Disclosed is a manual cart for strain relief heating that can accurately set a movement distance to the next heating position with a simple configuration when performing strain relief heating while intermittently moving the cart along a welded portion. I will provide a.
A heating device for heating a steel structure to remove distortion is mounted on a cart body with wheels that can travel on a steel structure that is an object to be heated, and synchronized with the wheels of the cart body. The cam 21 attached to the rotating shaft 7 that rotates, the stopper 22 that engages with the recess 21b provided on the peripheral surface of the cam 21, and the state in which the stopper 22 is normally engaged with the recess 21b of the cam 21. A constant distance stop device 20 having a casing 23 held by weight and a lever and a wire 25 for releasing the stopper 22 from the recess of the cam 21 when the carriage main body is moved is provided. A heating device is fixed to the casing 23 and moves up and down in conjunction with the up and down movement of the stopper 22.
[Selection] Figure 2

Description

  The present invention relates to a manual carriage for strain relief heating used for strain relief work of a welded part in the process of manufacturing a metal structure such as a ship.

  Steel structures such as ships have many parts that are assembled by welding steel plates, but the welded parts are distorted, so after welding is finished, the distortion is usually removed by heating the welded parts. Work is being done.

  As a conventional high-frequency induction heating device, for example, there is a device as shown in FIG. 5. A high-frequency current supplied from a heating power supply 50 is supplied to a box-shaped heating coil 51 to generate a high-frequency alternating magnetic flux, and heated The steel plate 52 itself is caused to generate heat by Joule heat generated by eddy current generated in the steel plate 52 which is an object.

  In the actual heating operation, the heating coil 51 is placed on the welded portion 53 of the steel plate 52, the switch 54 is turned on and the heating coil 51 is energized for heating for a predetermined time, and then the switch 55 is operated. Then, the operation of stopping the energization, moving the heating coil 51 along the welded portion 53 for a predetermined distance to stop, and turning on the switch 54 again to perform heating for a predetermined time is repeated many times.

  That is, the operator 56 grasps the hand push bar 57 with his / her hand, moves the heating coil 51 intermittently along the welded portion 53 by a predetermined distance, and repeats ON / OFF operations of the switches 54 and 55 to remove distortion and heat. Doing work.

  As a heating method for removing distortion, in addition to the example of FIG. 5 described above and the high frequency induction heating method described in Patent Document 1, a gas burner described in Patent Document 2 is used. The heating method used is known.

JP 2004-27275 A JP 2011-163424 A

  Both the heating device shown in FIG. 5 and the heating devices described in Patent Documents 1 and 2 are objects to be heated while moving the heating device continuously or intermittently along the welded portion. The steel structure is heated or cooled as necessary to remove welding distortion. However, when moving intermittently, it is difficult to automatically set the moving distance on the heating device side. It was.

  Therefore, the present invention is for strain relief heating that can accurately set the movement distance to the next heating position with simple configuration when performing strain relief heating while moving the carriage intermittently along the welded part. The purpose is to provide a manual cart.

In order to solve the above-mentioned problem, a manual cart for strain relief heating according to the present invention is provided on a cart body with wheels capable of traveling on a steel structure that is an object to be heated. In a manual carriage for strain relief heating equipped with a heating device for heating,
A cam attached to a rotating shaft that rotates in synchronization with the wheel of the cart body, a stopper that engages with a locking portion provided on a peripheral surface of the cam, and the stopper that is normally a locking portion of the cam A constant distance stop device having an urging mechanism that maintains a state of engaging with the cam body, and a detaching mechanism that disengages the stopper from the locking portion of the cam when the carriage main body is moved, and locking the cam The heating device is configured to move close to and away from the steel structure in conjunction with the engagement / disengagement operation of the stopper with respect to the portion.
The heating device may be either a high frequency induction heating device or a heating device using a combustion gas burner.

  In the present invention, after the heat treatment for removing distortion at the first place by a heating device (whether high-frequency heating or combustion gas heating is used), the release mechanism is operated to release the stopper from the locking portion of the cam. After that, when the cart body starts to be moved by pushing and the release mechanism is returned to its original position, the stopper comes into contact with the circumferential surface of the cam. When the carriage body is further pushed, the cam rotates due to the rotation of the wheel, and when the cam rotates to the position of the locking portion of the cam, the stopper is locked to the locking portion by the urging mechanism, and the rotating shaft of the wheel stops. The bogie body also stops. The movement distance corresponds to one rotation of the wheel. At that position, the heating device is in close proximity to the steel structure, so that the heat treatment at that position can be performed quickly. By repeating this, distortion of the steel structure that is the object to be heated can be removed.

  According to the present invention, the cam attached to the rotating shaft that rotates in synchronization with the wheel of the carriage body, the stopper that engages with the locking portion provided on the peripheral surface of the cam, and the stopper are usually engaged with the cam. By providing a constant distance stop device having an urging mechanism that maintains a state of engagement with the stop portion and a release mechanism that releases the stopper from the locking portion of the cam when the carriage body is moved, the carriage is moved along the welded portion. When the distortion removal heating is performed while moving the light intermittently, the moving distance to the next heating position can be accurately set with a simple configuration. In addition, since the heating device is configured to move close to and away from the steel structure in conjunction with the engagement and disengagement of the stopper with the locking portion of the cam, there is no need to provide a separate lifting mechanism for the heating device. Rapid heat treatment can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a manual carriage for strain relief heating according to an embodiment of the present invention, wherein (a) is a side view, (b) is a side view, and (c) is a plan view. BRIEF DESCRIPTION OF THE DRAWINGS The structure of the constant distance stop apparatus which concerns on embodiment of this invention is shown, (a) is a side view, (b) is a front view, (c) is a top view. The cam which concerns on embodiment of this invention is shown, (a) is a front view, (b) is a top view. The stopper which concerns on embodiment of this invention is shown, (a) is a front view, (b) is a top view. It is a perspective view which shows the conventional high frequency induction heating apparatus.

  Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. In this embodiment, an example in which a high-frequency induction heating device is mounted as the heating device is shown, but a gas burner using fuel gas can be used as the heating device, and the heating method is not limited.

  In FIG. 1, a manual carriage for strain relief heating according to an embodiment of the present invention includes a carriage body 10 that can be moved by wheels 1, a high-frequency induction heating coil 2 mounted on the carriage body 10, and this coil. 2 has a high-frequency transformer 3 for passing a high-frequency current. Further, a power line for supplying power from a heating power source (not shown) to the high-frequency transformer 3, a power line for supplying power and the coil 2, and a water supply tube for supplying cooling water for cooling the high-frequency transformer 3 are provided inside. The stored hose 4 is connected to the cart body 10. A handle body 5 is attached to the cart body 10, and a switch 6 for turning on / off the power to the coil 2 is provided at the tip thereof.

  A constant distance stop device 20 is attached to one of the wheels 1 of the carriage body 10 as shown in detail in FIG. In other words, the cam 21 is fixed to the rotating shaft 7 of the wheel 1, and the casing 23 to which the stopper 22 contacting the circumferential surface of the cam 21 is attached is movable up and down with respect to the fixed column 24 fixed to the carriage body 10. Install. The casing 23 is fixed with the coil 2 and the high-frequency transformer 3 attached thereto. A wire 25 is attached to the casing 23 and can be moved up and down by a lever 8 at the tip of the handle 5 as shown in FIG. The coil 2 and the high frequency transformer 3 are attached to the casing 23, and the coil 2 and the high frequency transformer 3 also move up and down in conjunction with the vertical movement of the stopper 22.

  As shown in detail in FIG. 3, the cam 21 has a circumferential surface 21a having a constant radius and a recess 21b in which the tip of the stopper 22 is fitted and engaged, and the front portion of the recess 21b is engaged. It is a stop wall 21c.

  As shown in detail in FIG. 4, the stopper 22 is formed of a round bar-like rod, and the head portion 22 a at the tip is hemispherical.

  The constant distance stop device 20 has the above-described configuration, and when stopped, the head portion 22a of the stopper 22 is fitted into the concave portion 21b of the cam 21, and the state thereof is maintained by the weight of the casing 23.

  At the time of the first heating for removing distortion, the carriage main body 10 is moved to a predetermined position, and the head portion 22a of the stopper 22 is fitted into the concave portion 21b of the cam 21 at that position. As a result, the coil 2 comes close to the surface to be heated and heat treatment is possible. The switch 6 at the tip of the handle 5 is operated to start heating. The heating time is set by a timer or the like, and when the heating time is reached, the operator is notified by a buzzer or a lamp.

  When heating at that position is completed, the wire 25 is pulled up by operating the lever 8 at the front end of the handle, and the casing 23 is thereby raised. As a result, the head portion 22a of the stopper 22 is detached from the concave portion 21b of the cam 21, and the coil 2 and the high-frequency transformer 3 constituting the heating device also rise from the surface to be heated. If the handle 5 is pushed in this state to move the carriage body 10 forward a little, the head 22a of the stopper 22 comes to the circumferential surface 21a of the cam 21, so that even if the lever 8 is released, the head 22a of the stopper 22 remains in the circumference of the cam. The casing 23 comes into contact with the surface 21a and is kept in the raised position, and does not descend.

  When the wheel body 10 is pushed by hand and the wheel 1 is rotated approximately once, the cam 21 also rotates once, and the head 22 a of the stopper 22 falls into the recess 21 b of the cam 21 due to the load applied to the casing 23. Since the front of the recess 21b is a locking wall 21c, the rotating shaft 7 of the wheel 1 cannot be rotated any further, the carriage body 10 stops, and the coil 2 fixed to the casing 23 also descends. At the same time, the coil 2 and the high-frequency transformer 3 are also lowered, and the coil 2 comes close to the surface to be heated. In this state, the heat treatment is performed by operating the switch 6. By repeating this, distortion removal heating can be performed while the carriage body 10 is moved intermittently along the welded portion.

  In this example, the radius R of the wheel 1 is set to 50 mm, the length L of the coil 2 is set to 150 mm, high-frequency heating is performed around the portion of the length L, and then the carriage main body 10 is stopped at a position where it is moved forward. In this position, high-frequency heating is performed mainly at a portion of 150 mm, and this is repeated to remove distortion by efficient heat treatment.

  As described above, according to the embodiment of the present invention, the cam 21 attached to the rotating shaft 7 that rotates in synchronization with the wheel 1 of the carriage body 10, and the locking portion provided on the circumferential surface of the cam 21. A stopper 22 that engages with the recess 21b, a biasing mechanism by the weight of the casing 23 that normally keeps the stopper 22 engaged with the recess 21b of the cam 21, and the stopper 22 when the carriage body 10 moves. By providing the constant distance stop device 20 having the lever 8 as a release mechanism for releasing from the concave portion 21b of 21, when performing strain relief heating while intermittently moving the carriage body 10 along the welded portion, The moving distance to the next heating position can be accurately set with a simple configuration.

  In the present embodiment, an example in which the cam 21 is directly attached to the rotating shaft 7 of the wheel 1 has been shown. However, the cam 21 is indirectly linked by interposing a gear or the like between the rotating shaft 7 and the shaft of the cam 21. You may do it.

  The present invention provides a manual strain relief heating system that can accurately set the movement distance to the next heating position with a simple configuration when performing strain relief heating while intermittently moving the carriage along the welded part. As a cart, it can be suitably used for distortion removal work of a welded part in the process of manufacturing a metal structure such as a ship.

DESCRIPTION OF SYMBOLS 1 Wheel 2 Coil 3 High frequency transformer 4 Hose 5 Handle 6 Switch 7 Rotating shaft 8 Lever 10 Carriage body 20 Constant distance stop device 21 Cam 21a Circumferential surface 21b Recessed part 21c Locking wall 22 Stopper 22a Head 23 Casing 24 Fixed support pillar 25 Wire

Claims (3)

In a hand truck for strain relief heating equipped with a heating device that heats the steel structure to remove the strain on the car body with wheels that can travel on the steel structure that is the object to be heated,
A cam attached to a rotating shaft that rotates in synchronization with the wheel of the cart body, a stopper that engages with a locking portion provided on a peripheral surface of the cam, and the stopper that is normally a locking portion of the cam A constant distance stop device having an urging mechanism for maintaining a state of engagement with the carriage main body and a detaching mechanism for detaching the stopper from the locking portion of the cam when the carriage main body is moved, and the locking portion of the cam A manual carriage for strain relief heating, wherein the heating device is configured to move toward and away from the steel structure in conjunction with the engagement / disengagement operation of the stopper to / from.   The manual carriage for strain relief heating according to claim 1, wherein the heating device is a high frequency induction heating device.   2. The manual carriage for strain relief heating according to claim 1, wherein the heating device is a heating device using a combustion gas burner.

Images