JPS606020Y2 - Vertical screw conveyor type unloader - Google Patents

Description

[Detailed explanation of the invention] This invention has an elevating boom attached to a frame rotatably or fixedly installed on the machine base, and a screw conveyor attached to the tip of the elevating boom via a movably suspended screw support frame. This invention relates to improvements to vertical screw conveyor type unloaders.

An outline of the mass and vertical screw conveyor type unloader will be described, and then the present invention will be explained.

Generally, this type of unloader includes a machine base 1, a frame 2 rotatably or fixedly provided on the machine base, and a boom whose base end is movably supported by a bracket 3 fixed on the frame. 4, a screw support frame 5 movably suspended from the tip of the boom, and an outer cylinder 6 that constitutes a screw conveyor to which this frame is attached. The screw conveyor is wound around a groove wheel 11 at the tip of the boom via a groove wheel 10 on top of the boom 9, and by driving the lifting rope 8 up and down, the tip of the boom 4 is raised and lowered to raise and lower the screw conveyor.

Such a vertical screw conveyor type unloader must be lowered while being held in order to apply a predetermined contact pressure to the lower end of the screw conveyor during cargo handling operations.

By the way, since one end of the elevating rope 8 has conventionally been connected to the frame 2 as shown by the chain line 8' in the figure, the lower end of the screw outer cylinder 6 comes into contact with the hatch or bottom of the bulk carrier 13 during cargo handling, and the Due to the impact and the weight of the screw outer cylinder 6, screw support frame 5, boom 4, etc., excessive contact pressure is generated and there is a risk of damaging the screw outer cylinder 6. The drawback is that it requires a lot of attention.

This invention was made with the aim of improving the current situation, and as shown in the figure, a balance weight 14 equipped with frame retaining pieces 14' at the top and bottom is placed far apart from the vertical length of the boom at the rear end of the frame 2. The balance weight 14 is slidably provided, and one end of an elevating rope 8 guided from the boom elevating drum 7 through groove wheels 10, 11 and 12 is connected to the balance weight 14.

The weight of the balance weight 14 is smaller than the tension of the elevating rope 8 and is made so as to apply an appropriate contact pressure to the lower end of the screw. Also, on the side of the upper end of the balance weight 14, there is a drum drive motor acting on the upper and lower sides. Limit switches 16 and 17 are provided, and a striker 15 facing these limit switches is provided on the balance weight 14.

This invention has the above-mentioned configuration, and when the drum driving electric motor 18 is driven to let out the elevating rope 8, the balance weight 14 is moved to the frame retaining piece 1 as shown in FIG.
The boom 4 is lowered while keeping the boom 4' in contact with the lower end surface of the frame 2.

Furthermore, when the lower end surface of the screw conveyor outer cylinder 6 suspended from the tip of the elevating boom 4 comes into contact with the bottom of the bulk carrier 13, the balance weight 14 moves downward by the amount of slack in the elevating rope 8, and the striker 15 The limit switch 16 is activated to stop the drum drive motor 18.

At this time, if excessive contact pressure is applied to the lower end of the screw outer cylinder 6 and the elevating rope 8 becomes slack, the striker 15 moves downward together with the balance weight 14, and the emergency limit switch 17 is actuated to drive, for example, a drum. Electric motor 1
8 is driven toward the take-up side, thereby preventing the elevating rope 8 from loosening.

As described above, this idea is based on a balance weight that has a self-weight smaller than the tension of the elevating rope and is equipped with frame retaining pieces on the top and bottom that are separated by a distance greater than the vertical length of the frame. One end of the boom elevating rope is connected, and a limit switch for operating the elevating rope drive device is vertically arranged near the upper end of the balance weight of the frame, and a striker for operating the limit switch is disposed on the upper end of the balance weight. The lower end of the screw conveyor can be maintained at the optimum contact pressure for cargo handling at all times because the elevating rope drive device is controlled in response to the movement of the balance weight due to the contact pressure between the lower end of the screw conveyor and the object. This reduces operator fatigue and improves cargo handling operations.

Furthermore, it is extremely effective in preventing damage to the screw tip, reducing the weight of the screw support frame, and improving the stability of the entire unloader.

[Brief explanation of drawings]

FIG. 1 is a side view of an unloader to which the present invention is applied, and FIG. 2 is a detailed cross-sectional view taken along line 1 to 2 in FIG. 1... Machine base, 2... Frame, 4...
... Boom, 5 ... Screw support frame, 6 ... Screw outer cylinder, 7 ... Elevation drum, 8 ... Elevation rope, 10. 11,12
... Groove wheel, 14 ... Balance weight, 15 ... Striker, 16, 17 ...
・Limit switch, 18...Drum drive motor.

Claims (1)

[Scope of utility model registration request] In an unloader with a screw conveyor at the tip of the boom whose base end is movably supported on a frame rotatably or fixedly installed on the machine platform, the self-weight is less than the tension of the elevating rope and the distance is greater than the vertical length of the frame. A balance weight with frame engaging pieces on the top and bottom is installed at the rear of the frame so that it can move freely below the ground, one end of a boom elevating rope is connected to this balance weight, and an elevating rope drive device is installed near the upper end of the balance weight of the frame on the side. Activating limit switches are arranged above and below, and a striker for activating the limit switches is attached to the side of the upper end of the balance weight to respond to the movement of the balance weight due to the contact pressure between the lower end of the screw conveyor and the object. A vertical screw conveyor type unloader characterized in that it is configured to control an elevation rope drive device.