JPS62846Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a crane-type shot blasting machine, in which a shaft is attached to the upper part of the hook shaft to rotate the hook shaft that suspends the object to be polished after it has moved to the center of the blast chamber. The roller chain that engages with the sprocket and rotates it can be retracted laterally together with the rotation drive unit, and the roller chain and the sprocket of the hook shaft can be freely engaged and disengaged, so that the hook shaft can be moved to the center of the blast chamber. The present invention relates to a hook shaft rotation device for a crane type shot blasting machine, which allows for smooth movement and separation of the hook shaft, as well as smooth rotation of the hook shaft during shooting.

Traditionally, crane-type shot blasting machines have been suspending the object in the center of the shot blasting chamber and projecting shots while rotating at low speed in order to uniformly polish the outer surface of the object to be cleaned. It is something. The object to be polished is suspended from a hook outside the blasting chamber, moved to the central position of the blasting chamber by a crane, and then fixed on the ceiling at that position and attached to a roller chain that rotates at a low speed. The object to be cleaned is rotated by engaging a sprocket mounted on the shaft above. However, when moving the hook shaft on which the object to be polished is suspended to the central position of the blast chamber, the crane is moved at a relatively fast speed in order to shorten the transition time. The roller chain for rotating the hook shaft that rotates above rotates at an extremely low speed in order to improve the cleaning effect by projecting shots onto the entire surface of the object to be cleaned, so the sprocket of the hook shaft rotates at a very low speed. When the hook shaft is engaged with the chain, the moving speed of the hook shaft and the rotation speed of the roller chain will be significantly different, and the two may not mesh smoothly and may end up in a jammed state, damaging the engagement part, or the sprocket may cause damage to the roller chain. If the rollers do not mesh with each other and come off obliquely, the hook shaft cannot move or rotate itself, and the hook shaft oscillates greatly, significantly reducing the cleaning effect. In other words, when the sprocket of the hook shaft, which is transferred at a high speed to the roller chain rotating at an extremely low speed, is pushed out by the hoist, the sprocket will rotate in the opposite direction to the rotation direction of the roller chain, and the hook shaft will move into the blast chamber. When the limit switch stops the movement at the center of the roller chain, it will now synchronize with the direction of rotation of the roller chain, causing it to rotate in the opposite direction again. In this way, the hook shaft tries to repeatedly rotate forward and reverse depending on the rotation of the roller chain and the transfer speed between the hook shaft and the sprocket because a considerable weight of the object to be polished is suspended below the hook shaft. It does not rotate easily, and the above-mentioned jamming condition occurs. In addition, when the hook shaft moves quickly when detached from the roller chain after cleaning, the same problem as before occurs, and when it comes to penetrating crane blasting, the circumferential side of the roller chain is engaged with the constant rotation direction of the roller chain. However, the sprocket passing in one direction cannot be engaged, and there is a large shock especially when the hook shaft moves to the opposite side of the rotation direction of the roller chain, resulting in a stuck state and stopping in the middle of the roller chain. This causes such inconveniences.

In this case, when the hook shaft that suspends the object to be polished outside the blast chamber moves to the center position of the blast chamber or leaves from there, the sprocket of the hook shaft is forcibly engaged with the roller chain, which causes the above-mentioned inconvenience. In order to avoid this problem, when the hook shaft is moved, the roller chain is retracted laterally along with the rotary drive unit to correct this problem, and when the hook shaft stops at the center of the blasting chamber, the roller chain is pushed out toward the sprocket. Since it is designed to mesh with this, the rotation of the hook shaft can be performed extremely smoothly and uniform projection onto the object to be cleaned can be achieved.

To explain this using an example, a pedestal 4 is installed horizontally on the ceiling 1 at the center of the blasting chamber in parallel to the traveling gap 8 of the hook shaft 2, and a rotation shaft hole 5 is bored in the upper surface of one end of the pedestal 4. Furthermore, the rotation shaft 7 protruding from the lower surface of one side end of the rotation frame 6 superposed on the pedestal 4 is fitted into the rotation shaft hole 5 of the pedestal 4, and then the rotation frame 6 is inserted into the rotation shaft hole 5 of the mount 4.
At the same time, the ball casters 8, 8' are fitted to the lower surface of the other end, and at the same time, the tip of the operating rod 10 of the air cylinder 9 fixed on the pedestal 4 is attached to the side surface of the other end. 9 allows the rotating frame 6 to rotate around the rotating shaft 7 with the ball casters 8, 8' at the other end sliding on the sliding rail 11 of the pedestal 4. Sprockets 12, 12' are protruded from the upper surface of the end, and an annular roller chain 13 is stretched between them. In the figure, 14, 14' are chain guides, and 15 is a drive motor with a reduction gear. , 16 is a hook shaft sprocket, and 17 is a hook.

The present invention is constructed as described above, and the process of rotating the hook shaft 2 through this operation is as follows: The object to be polished is suspended from the hook 17 by a chain or the like outside the blasting room, and is then moved by a hoist crane. After lifting it to a certain height, it is moved toward the center of the blasting room at a relatively high speed. At this time, the roller chain 13 of the present invention, which is placed above the center ceiling 1 of the blasting room, is already rotating at an extremely low speed. Moreover, when the hook shaft 2 is moved, the air cylinder 9 is actuated in advance, and even if the hook shaft sprocket 16 moves to the center position of the blasting chamber, it is rotated to avoid forced engagement with the roller chain 13. Since it is retracted laterally around the rotation axis 7 of the frame 6, the hook shaft sprocket 16 does not rotate without being hindered by anything until it reaches the desired position, and then returns to its center position. When this is detected by a limit switch (not shown), the air cylinder 9 is activated, and the ball casters 8, 8' fitted on the lower surface of the other end of the rotating frame 6 move against the sliding rail 11 of the frame 4. Since the roller chain 13 is pushed out toward the hook shaft sprocket 16 by sliding on the top, the roller chain 13 moves to the center position of the blast chamber and smoothly engages with the stopped hook shaft sprocket 16. This will cause the hook shaft 2 to rotate. In this way, while rotating the hook shaft 2 for a certain period of time, shots are uniformly projected onto the object to be cleaned suspended below it, and once the cleaning is completed, the hook shaft 2 is returned to the outside of the blasting room again. If the air cylinder 9 is activated and the roller chain 13 is disengaged from the hook shaft sprocket 16 and retracted laterally as before, the hook shaft 2 will be easily returned to the outside of the blasting room since there is nothing attached to it. Then, it is suspended again to the next object to be cleaned, and these cleanings are performed one after another.

As described above, when the hook shaft 2 moves to the center position of the blast chamber and leaves there, the roller chain 13 that rotates the hook shaft 2 is rotated laterally together with the rotation frame 6 to avoid unnecessary engagement. Since the roller chain 13 is avoided as before,
Because it allows the hook shaft 2 to rotate accurately and smoothly without causing any trouble, no matter how different the rotation speed of It can also be used in a rotating device for crane blasting or in a penetrating crane type shot blasting machine in which the hook shaft passes through the blast chamber, and the roller chain 13 is connected to the sprocket 16 for the hook shaft.
If the engagement and disengagement operations are performed in conjunction with the opening and closing of each door of the blast chamber, it will be extremely useful to perform the cleaning work of the object to be cleaned with extremely high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the present invention, FIG. 2 is a right side view, and FIG. 3 is a plan view. In the figure 1...Ceiling of the blasting room, 2...Hook shaft, 4...Base, 5...Rotating shaft hole, 6...Rotating rod, 7...Rotating shaft, 8, 8'...Ball Caster, 9...air cylinder, 10...operating rod,
11...Sliding rail, 12, 12'...Sprocket, 13...Roller chain, 16...Hook shaft sprocket.

Claims (1)

[Scope of utility model registration request] A pedestal 4 is installed horizontally on the ceiling 1 at the center of the blasting room in parallel with the travel gap 8 of the hook shaft 2, and a rotation shaft hole 5 is bored in the upper surface of one end of the pedestal 4. The rotation shaft 7 protruding from the lower surface of one side end of the rotation frame 6 that overlaps with the rotation frame 6 is inserted into the rotation shaft 5 of the pedestal 4,
Next, the ball casters 8, 8' are fitted to the lower surface of the other end of the rotating frame 6, and at the same time, the tip of the operating rod 10 of the air cylinder 9 fixed on the frame 4 is attached to the side surface of the other end. The ball casters 8 and 8' at the other end of the rotating frame 6 are made to slide on the sliding rail 11 of the frame 4 with the rotating frame 6 centered around the rotating shaft 7 by the operation of the air cylinder 9, and further Sprockets 12, 12' are installed on the upper surface of both ends of the rotating frame 6.
is provided protrudingly, and an annular roller chain 13 is installed between it.
A hook shaft rotation device for a crane-type shot blasting machine, characterized in that the hook shaft rotation device is provided with a crane-type shot blasting machine.