Please select the most similar patent number from A, B, C and D. Which number is?
A storage rack system, comprising a cross beam (1), vertical beams (2), supports (3), a rack (4), and position-limiting members (5). The vertical beams (2) are slidably connected to the cross beam (1); the supports (3) are detachably connected to the vertical beams (2); the rack (4) is in contact with upper edges of the supports (3); the position-limiting members (5) are detachably connected to the supports (3) by means of gaskets (51); and the position-limiting members (5) are connected to the supports (3) and can prevent the rack (4) to move relative to the supports (3). The strength of parts of connection between the supports (3) and the vertical beams (2) is enhanced by means of the gaskets (51), and the stability of the supports (3) and the rack (4) is improved by means of the position-limiting members (5), such that the goods bearing capacity of the storage rack system is improved on the whole.
A: A folding swing seat. A hanging seat is detachably hung on a support; two groups of stand pipes (1) are connected by means of intersecting pipes (2), and the distance between the two groups of stand pipes can be changed by means of the scissor-like opening and closing of the intersecting pipes (2), and the intersecting pipes are fixed to the stand pipes (1) by means of sliders (3) so as to keep the structure stable; support pipes (4) are hinged on the sliders (3), and the bottom ends of the support pipes (4) can be in contact with the ground; stabilization pipes (5) are hinged on the support pipes (4), and the support pipes (4) are restricted by the stabilization pipes (5) from swing with respect to the sliders (3); the bottom ends of the stand pipes (1) and the bottom ends of the support pipes (4) can be in contact with the ground, forming a plurality of support points. The folding and unfolding process of the folding swing seat depend on the sliders (3) sliding along the stand pipes (1), so as to drive the support pipes (4) and the stabilization pipes (5) to move together, and finally the folding swing seat can be folded in a state that the support pipes (4) and the stabilization pipes (5) are kept parallel to the stand pipes (1), and the whole structure is integrally connected without splitting into a plurality of independent parts, thereby facilitating storage.
B: A shelf device (200) and a support assembly (100). The shelf device (200) comprises a shelf (201), a support (20) and a limiting member (30). The support (20) is detachably arranged at a preset mounting position, the limiting member (30) is mounted on the support (20) and is in conjunction with the shelf (201), and the limiting member (30) prevents the shelf (201) from being separated from the support (20). The shelf device (200) is provided with the limiting member (30) so that the shelf (201) is not easily separated from the support assembly (100), thereby correspondingly avoiding potential safety risks in use of the shelf device (200).
C: A rotating support position-limiting mechanism, comprising a plate body (1). Rotating rods (2) are hinged onto a surface of the plate body (1), rotating free ends of the rotating rods (2) are connected to a support (3), and mounting seats (4) are sleeved on a rod body of the support (3); detachable position-limiting members (6) are disposed on the surface of the support (3), and the position-limiting members (6) are disposed on side edges of the mounting seats (4) and are attached to the mounting seats (4). According to the rotating support position-limiting mechanism, detachable position-limiting members are disposed on the surface of a support, and the position-limiting members are disposed on side edges of mounting seats and are attached to the mounting seats, thereby achieving a position-limiting effect on the mounting seats, and avoiding the phenomenon in the prior art of collision and interference between a bed board and other objects caused by left and right movement of a support and even avoiding the situation of failure of the support.
D: A storage rack. The storage rack comprises four upright support columns (1) and several horizontal storage plate frames (2) provided between the four support columns (1), and a storage plate (3) is correspondingly placed above each storage plate frame (2). The storage plate frame (2) comprises two first beams (5) and two second beams (6); providing a horizontal crimping (10) at an edge position of the first beam (5) facilitates improving supporting strength of the first beam (5), and providing a horizontal crimping (14) at an edge position of the second beam (6) facilitates improving supporting strength of the second beam (6); because the supporting strength of the first beam (5) and that of the second beam (6) are improved, the supporting strength of the storage plate frame (2) is improved, and thus the supporting strength of the storage rack is improved. In addition, the support column (1) consists of one or more standing columns (4), and respectively providing an upright crimping (23) at an edge position of each standing column (4) facilitates improving supporting strength of the standing column (4). Moreover, designing the horizontal crimpings (10, 14) and the upright crimpings (23) further improves the supporting strength of the storage rack.
Answer: D