A sign holder with a circular single-sided strong magnet

Abstract

This utility model relates to the field of advertising and display equipment, specifically a sign clamping device with a circular single-sided strong magnet, suitable for iron display shelves in commercial retail scenarios where signs need frequent replacement. Existing similar devices suffer from high magnet costs, low assembly efficiency, and insufficient magnetic strength. This device includes a transparent, elongated main body with an "M"-shaped cross-section to form a clamping groove. Three circular mounting holes are provided at the bottom, each containing a circular single-sided strong magnet. The main body is integrally injection molded from transparent polycarbonate (PC) plastic, and the magnet consists of a circular iron shell and a circular N35 neodymium iron boron magnetic sheet. This device can reduce magnet costs by approximately 60%, improve assembly efficiency, increase magnetic strength by approximately 20%, and is compatible with signs of 2.5-5mm thickness, facilitating replacement and adjustment.

Description

Technical Field

[0001] This utility model relates to the field of advertising and display equipment, specifically to a sign clamping device with a circular single-sided strong magnet for fixing signs, which is particularly suitable for iron display shelves in commercial retail scenarios where signs need to be frequently replaced. Background Technology

[0002] The applicant previously applied for a design patent for a device for holding signs on iron shelves (patent number can be specified, such as "patent number ZL 2023 3 0662162.1"). This device uses a transparent main body with an "M"-shaped cross-section to hold the signs, and relies on magnets embedded in the bottom to adhere to the iron shelf. However, in the prior art, including the products corresponding to the aforementioned design patent and products on the market, the magnets all adopt a square double-sided neodymium iron boron magnet structure design, which has the following defects:

[0003] 1. High cost: The processing of square double-sided magnets requires high dimensional accuracy, with both length and width dimensions needing to be controlled within ±0.05mm. In addition, square magnets need to be processed on 6 sides, and there are also certain requirements for surface roughness, which increases the production and processing costs.

[0004] 2. Inconvenient installation: The square magnet and the mounting groove at the bottom of the main body require high precision to fit. During assembly, the length and width dimensions must meet the precision requirements for it to be installed smoothly. Otherwise, it will be too large to fit or too loose and will easily fall off.

[0005] 3. Insufficient magnetic attraction strength: The double-sided magnetic design results in the waste of magnetic force on the other side. The effective attraction force of a single magnet to iron shelves is weak, and even when three magnets are combined, they are still prone to displacement under external force.

[0006] To overcome the shortcomings of the existing technology, this invention innovates and improves the structure and type of magnets to achieve the goals of cost reduction, efficiency improvement and enhanced adsorption stability. Utility Model Content

[0007] I. Purpose of the utility model

[0008] The purpose of this utility model is to provide an improved magnetic shelf label clamping device, which solves the problems of high magnet cost, low assembly efficiency and insufficient magnetic strength in the prior art.

[0009] II. Technical Solution

[0010] A sign holder with a circular single-sided strong magnet includes a transparent main body (1), which is elongated and has an "M"-shaped cross-section (see Figure 2) to form a clamping groove (2) for holding the sign. The opening width of the clamping groove (2) is 2.2 mm, which can accommodate KT board or plastic sign with a thickness of 2.5-5 mm. The bottom of the main body (1) has three circular mounting holes (3) along its length (see Figure 1). A circular single-sided strong magnet (4) is fixedly embedded in the circular mounting holes (3) (see Figure 4). The center distance between the three circular mounting holes (3) is 40 mm (see Figure 1). Figure 3 ), to ensure that the circular single-sided strong magnets (4) are evenly distributed, and to stably attach the main body (1) to the iron shelf.

[0011] Furthermore, the main body (1) has a length of 100mm, a width of 22mm, and a height of 28mm (see [reference]). Figure 2 The sign is made of transparent polycarbonate (PC) plastic and is injection molded in one piece, which ensures both structural strength (drop-resistant and durable) and the integrity of the sign content without obstruction.

[0012] Furthermore, the circular single-sided strong magnet (4) is composed of a circular iron shell (5) and a circular N35 neodymium iron boron magnetic sheet (6) (see Figure 5). The combined single-sided strong magnet has a diameter of Φ12mm and a thickness of 3.5mm; the circular N35 magnetic sheet has a diameter of Φ9.5mm and a thickness of 1.2mm; the combined vertical attraction of the three magnets exceeds 3KG, which is about 20% higher than the original vertical attraction of 2.5KG; and the cost of the circular single-sided strong magnet is reduced by about 60%.

[0013] III. Beneficial Effects

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. Significantly reduced cost: The N35 magnetic sheet (6) of the circular single-sided strong magnet (4) has a volume of 70.88 mm. 3 The original square magnet (10 x 8 x 3 mm) had a volume of 240 mm². 3 The N35 material is reduced by about 70%, and the round shape is easy to process. By eliminating the increased cost of the iron shell, the cost of magnets per unit is reduced by about 60%.

[0016] 2. Improved assembly efficiency: The circular iron shell (5) is cold-forged using a mold, resulting in high dimensional accuracy. The circular mounting hole (3) and the circular single-sided strong magnet (4) have a higher tolerance for mismatch. There is no need to align the corners during assembly, thus improving efficiency.

[0017] 3. Enhanced magnetic stability: The three round single-sided strong magnets made of neodymium iron boron (4) have a combined vertical attraction of more than 3KG, which is about 20% stronger than the original vertical attraction of 2.5KG. The attraction is stronger and it is not easy to fall off.

[0018] 4. Functional compatibility retention: The original “M”-shaped clamping groove (2) and transparent main body base (1) design are retained, and it can still be adapted to common signs with a thickness of 2.5-5mm. The original device can be directly replaced without changing the specifications of the sign. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0020] Figure 1 is a three-dimensional exploded view of the overall structure of the sign holder with a circular single-sided strong magnet of this utility model.

[0021] Figure 2 is a front view of the end face of the main body (1) in this utility model;

[0022] Figure 3 is a cross-sectional view AA of the main body (1) in this utility model;

[0023] Figure 4 is a three-dimensional schematic diagram of the bottom structure of the main body (1) in this utility model;

[0024] Figure 5 is a three-dimensional exploded view of the circular single-sided strong magnet (4) in this utility model;

[0025] Explanation of the labels in the diagram: 1 - Main body base, 2 - Clamping groove, 3 - Circular mounting hole, 4 - Circular single-sided strong magnet, 5 - Circular iron shell, 6 - Circular N35 neodymium iron boron magnetic sheet. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] I. Processing and Assembly Steps

[0028] 1. Machining of the main body base:

[0029] 1.1 Raw material selection: Transparent polycarbonate (PC) plastic granules (model: PC 1100U) are used, conforming to GB / T11946-2015 "Polycarbonate (PC) Resin for Plastic Molding" standard;

[0030] 1.2 Injection Molding Process: A horizontal injection molding machine is used, with the injection temperature controlled at 260-280℃ (260℃ in the front section of the barrel, 270℃ in the middle section, and 280℃ in the rear section), the injection pressure at 80-100MPa, and the single mold injection time at 60 seconds.

[0031] 1.3. Structural Forming: The main body (1) is integrally formed by custom mold (see Figures 2 and 3), with dimensions of 100mm in length, 22mm in width, and 28mm in height; at the same time, a "M"-shaped clamping groove (2) with a clamping width of 2.2mm is machined in the center of the main body (1) (see Figure 2), and three circular mounting holes (3) (diameter 12mm, depth 3.5mm) (see Figure 3) are machined along the length direction at the bottom, with a center-to-center distance of 40mm between the holes.

[0032] 2. Magnet assembly:

[0033] 2.1 Magnet pretreatment: Select neodymium iron boron circular magnetic sheets (6) (grade N35, diameter 9.5mm, thickness 1.2mm) and install them into the iron shell (5) to form a single-sided strong magnet (4) (see Figure 5); the surface is treated with nickel-copper-nickel plating (complies with QB / T1984-2019 "NdFeB Permanent Magnets" standard) to ensure rust prevention performance;

[0034] 2.2 Fixing method: Press the single-sided strong magnet (4) into the circular mounting hole (3) with an interference fit to ensure that the magnet adsorption surface is flush with the bottom surface of the main body (1).

[0035] 3. Finished product inspection:

[0036] 3.1 Magnetic strength test: The finished product is attached to a 5kg iron block (thickness greater than 1mm). A pull gauge (accuracy 0.1kg) is used to pull it vertically. The pull force is required to be ≥2.5kg, and the single-sided strong magnet (4) will not fall off the main body.

[0037] 3.2,2 Clamping stability test: Insert a 5mm thick PVC sign (size: 50mm×20mm) into the clamping slot (2), and vertically attach the device to the shelf. The sign does not slip.

[0038] 3.3 Appearance inspection: By visual inspection (under natural light, at a distance of 30cm), the main body (1) has no bubbles or scratches (scratch length ≤0.5mm), no exposed magnets, and no peeling of the plating.

[0039] II. Usage Method

[0040] 1. Sign installation: Insert the KT board or plastic sign (2.5-5mm thick) into the opening of the clamping groove (2) until the bottom of the sign is in contact with the inner wall of the clamping groove (2) to complete the sign fixing;

[0041] 2. Fixing the device: Align the circular single-sided strong magnet (4) at the bottom of the main body (1) with the flat area of ​​the iron shelf (such as the side of the shelf beam or column) and place it on the surface to achieve adsorption and fixation;

[0042] 3. Adjustment and replacement: If the device position needs to be adjusted, apply a force of 5-8N in the horizontal direction to remove the device from the shelf and re-attach it to the target position; if the sign needs to be replaced, simply pull out the old sign from the clamping slot (2) and insert the new sign without disassembling the device.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A sign clamping device with a circular single-sided strong magnet, characterized in that, The main body (1) is a transparent base, which is long and narrow with an "M"-shaped cross-section to form a clamping groove (2) for holding the sign. The opening width of the clamping groove (2) is 2.2 mm. Three circular mounting holes (3) are provided at the bottom of the main body (1) along its length. A circular single-sided strong magnet (4) is fixedly embedded in the circular mounting holes (3). The center distance between the three circular mounting holes (3) is 40 mm.

2. The sign holder with a circular single-sided strong magnet according to claim 1, characterized in that, The main body (1) has a length of 100mm, a width of 22mm, and a height of 28mm.

3. The sign holder with a circular single-sided strong magnet according to claim 1, characterized in that, The main body (1) is integrally injection molded from transparent polycarbonate (PC) plastic material.

4. The sign holder with a circular single-sided strong magnet according to claim 1, characterized in that, The circular single-sided strong magnet (4) is composed of a circular iron shell (5) and a circular N35 neodymium iron boron magnetic sheet (6). The combined single-sided strong magnet (4) has a diameter of Φ12mm and a thickness of 3.5mm; the circular N35 neodymium iron boron magnetic sheet (6) has a diameter of Φ9.5mm and a thickness of 1.2mm.

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