The following further details the present utility model in combination with the attached drawings.

Example 1: A magnetic box fixer, as shown in Figures 1 and 2, includes a non - magnetic fixing frame 1 arranged in a C - shape. The bottom surface of the non - magnetic fixing frame 1 is provided with a rectangular magnet groove 11, and a permanent magnet 2 is fitted into the magnet groove 11. Both ends of the non - magnetic fixing frame 1 are hollow - out - set. One end of the non - magnetic fixing frame 1 is set as a pressing end 12, and the other end is set as a supporting end 13. The pressing end 12 and the supporting end 13 are respectively located on both sides of the magnet groove 11.

When in use, the permanent magnet 2 is attracted to the formwork, the pressing end 12 presses against the formwork frame, and the supporting end 13 abuts against the formwork to form a support.

The bottom edge of the magnet groove 11 is hinged with a cover plate 14. One side of the cover plate 14 facing the permanent magnet 2 is coated with a weak - magnetic coating. When the magnetic box fixer is not in use, the permanent magnet 2 attracts the cover plate 14 to cover the magnet groove 11, preventing the permanent magnet 2 from attracting magnetic impurities of the magnet.

The bottom surface of the pressing end 12 is provided with a rectangular pressing opening 15. The pressing opening 15 can be set as a multi - layer stepped - shape pressing opening 15. Thus, for different formwork frame thicknesses, different - depth pressing openings 15 can be selected. The pressing opening 15 is buckled on the edge of the formwork, so that other parts of the bottom surface of the non - magnetic fixing frame 1 can be attached to the formwork.

A pressing bolt 3 is arranged in the pressing end 12. A pressing nut 31 is fixedly arranged on the inner top wall of the pressing end 12. The pressing bolt 3 is screwed with the pressing nut 31, and the pressing bolt 3 abuts against the formwork frame to form multi - point pressing.

A supporting bolt 4 is inserted through the supporting end 13. A supporting nut 41 is arranged on the inner top wall of the supporting end 13. The supporting bolt 4 abuts against the supporting nut 41, and the pressing bolt 3 forms multi - point pressing with the formwork.

As shown in Figures 1 and 2, the depth of the magnet groove 11 is greater than the thickness of the permanent magnet 2. The permanent magnet 2 is slidably arranged inside the pressing part. An elevating mechanism 5 for driving the permanent magnet 2 to ascend and descend in the magnet groove 11 is arranged between the non - magnetic fixing frame 1 and the permanent magnet 2. There is a weak - magnetic coating on the inner top wall of the magnet groove 11. The elevating mechanism 5 includes a through - hole 51 arranged on the non - magnetic fixing frame 1. The through - hole 51 is connected to the magnet groove 11. A pull rod 52 is inserted through the through - hole 51. One end of the pull rod 52 is fixedly connected with the permanent magnet 2, and the other end passes through the through - hole 51.

When the permanent magnet 2 is separated from the formwork, the permanent magnet 2 is attracted to the inner top wall of the magnet groove 11, thereby preventing the permanent magnet 2 from slipping out of the magnet groove 11.

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