Positioning error prevention hoop

1. A positioning error prevention hoop, comprising a hoop body curled to form a sleeving area, wherein a head section and a tail section of the hoop body overlap to form a superposed part, the head section of the hoop body at the superposed part is an outer-side belt body, the tail section is an inner-side belt body, one of the inner-side belt body and the outer-side belt body is provided thereon with a clamping notch, the other one of the inner-side belt body and the outer-side belt body is correspondingly provided thereon with a clamping piece that may be snapped into the clamping notch, the outer-side belt body is provided thereon with a fastening component, the hoop body is provided thereon with a limiting member in a clamping manner, and a limiting block extending in a direction facing an inner side of the hoop body is disposed on a side of the limiting member that is remote from the hoop body;

wherein the limiting member is a clamping block, an inner side of the clamping block is provided with a through slot penetrating through two opposite side walls of the clamping block, the hoop body is clamped within the through slot, and the limiting block is located at an end on a side of the clamping block that is remote from the hoop body;

two side walls of the through slot slope from a slot bottom to a slot opening, in a direction along which the two side walls get close to each other; and

the inner side of the clamping block abuts against a pipe before the hoop body is fully tightened on the pipe; and the hoop body is positioned between the clamping block and the pipe.

2. The positioning error prevention hoop of claim 1 , wherein the sleeving area is in a shape of an oval, a minor axis of the oval is shorter than a diameter of the pipe, and a major axis of the oval is longer than the diameter of the pipe.

3. The positioning error prevention hoop of claim 2 , wherein a rounded transition is formed between the two side walls of the through slot and the inner side of the clamping block.

4. The positioning error prevention hoop of claim 3 , wherein an outer side surface of the clamping block is spherical.

5. The positioning error prevention hoop of claim 1 , wherein the sleeving area is circular, and the clamping block abuts against a side wall of a pipe after the pipe passes through the sleeving area.

6. A positioning error prevention hoop, comprising a hoop body curled to form a sleeving area, wherein a head section and a tail section of the hoop body overlap to form a superposed part, the head section of the hoop body at the superposed part is an outer-side belt body, the tail section is an inner-side belt body, one of the inner-side belt body and the outer-side belt body is provided thereon with a clamping notch, the other one of the inner-side belt body and the outer-side belt body is correspondingly provided thereon with a clamping piece that may be snapped into the clamping notch, the outer-side belt body is provided thereon with a fastening component, the hoop body is provided thereon with a limiting member in a clamping manner, and a limiting block extending in a direction facing an inner side of the hoop body is disposed on a side of the limiting member that is remote from the hoop body;

wherein the limiting member is a snap ring having a notch, two end portions of the snap ring respectively point to the fastening component and are close to the fastening component, and an upper side edge and a lower side edge of the snap ring are provided with clamping mechanisms for clamping the hoop body;

each of the clamping mechanisms is structured as follows: an arc-shaped pressing rib is disposed on a side edge of the snap ring that is opposite to the limiting block in the direction facing the inner side of the hoop body, a side of the limiting block that faces the arc-shaped pressing rib is provided with an abutment projection, and the abutment projection is disposed to be in abutting connection with an end surface opposite the hoop body; and the hoop body is clamped between the abutment projection and the arc-shaped pressing rib; and

the arc-shaped abutment rib abuts against the side wall of the pipe when the pipe passes through the sleeving area.

7. The positioning error prevention hoop of claim 6 , wherein the clamping notch is located on the outer-side belt body, the clamping piece is located on the inner-side belt body, and the snap ring is provided thereon with a sidestepping aperture for the clamping piece to pass therethrough.

8. The positioning error prevention hoop of claim 6 , wherein at least two limiting blocks are disposed on a side edge of the snap ring in a spaced manner, in the direction facing the inner side of the hoop body.

9. The positioning error prevention hoop of claim 6 , wherein each of the clamping mechanisms is structured as follows: positioning projections facing the inner side of the hoop body are disposed on an end of the snap ring that is opposite to the limiting block, in a spaced manner, the arc-shaped pressing rib extends on a side edge of the snap ring that corresponds to the limiting block, in the direction facing the inner side of the hoop body, the limiting block is fixedly disposed on one side of the arc-shaped pressing rib that is remote from the positioning projections, and the hoop body is clamped between each of the positioning projections and the arc-shaped pressing rib.

10. The positioning error prevention hoop of claim 9 , wherein when the sleeving area receives the pipe passing therethrough, the arc-shaped pressing rib abuts against an outer wall of the pipe, and a gap is left between each of the positioning projections and the pipe.

11. The positioning error prevention hoop of claim 9 , wherein the at least two limiting blocks are disposed on the side edge of the snap ring in a spaced manner, in the direction facing the inner side of the hoop body.

12. The positioning error prevention hoop of claim 9 , wherein at least two positioning projections are provided.