Draft shields and electronic balances equipped with draft shields

Abstract

The present invention provides a draft shield and an electronic balance equipped with a draft shield. The draft shield comprises a top cover, a bottom shell, and at least two cylinders. The bottom end surface of the top cover comprises at least one first limiting portion and at least one second limiting portion. The first limiting portion projects outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion projects outward in a direction perpendicular to the direction of extension of the cylinder. Each cylinder comprises a first end portion and a second end portion, the first end portion comprising at least one first limiting hole and at least one second limiting hole. The first limiting portion is connected to the corresponding first limiting hole, the second limiting portion is connected to the corresponding second limiting hole, and the second end portions of the cylinders are fixedly connected to the bottom shell. The present invention has advantages such as improved production efficiency, reduced costs, and easier maintenance and replacement by after-sales personnel due to the effective connection through the interconnection between the opening in the cylinder and the boss of the top cover.

Description

Technical Field

[0001]

[0001] The present invention relates to the field of electronic scales, and particularly to a draft shield and an electronic scale provided with a draft shield.

Background Art

[0002]

[0002] An electronic scale is a scale that uses electromagnetic force to balance the weight of an object for weight measurement. Electronic scales are characterized by accurate and reliable weight measurement, fast and clear display, and provision of an automatic test system, a simple automatic calibration device, an overload protection device, etc. Electronic scales are generally suitable for industrial, agricultural, commercial, school, hospital, scientific research, and other units, and have certain requirements for sensitivity and stability.

[0003]

[0003] In these workplaces, weight measurement is easily affected by the external environment. Therefore, an electronic scale usually includes a draft shield, which is an essential part of the electronic scale.

[0004]

[0004] However, in the draft shield, the existing connection method between the windshield column and the top cover of the scale is very complicated. Usually, the column is fixed to the upper cover by screws and a connection plate. The column and the upper cover are securely connected to each other and assembled to form a completed draft shield together with the bottom shell. In such a structure, it is necessary to use screws to fix the column to the top cover of the windshield, and it is also necessary to use metal plate components to fix the positions of the left and right columns with respect to the windshield.

[0005]

[0005] Due to the many parts involved, the assembly process is complex, the assembly time on the production line is long, production line workers need a lot of time to complete the assembly, and costs are high. Furthermore, for the after-sales service team, subsequent maintenance is more troublesome.

[0006]

[0006] Taking this into consideration, the inventors of this application have designed a draft shield and an electronic balance equipped with a draft shield in order to overcome the above technical problems. [Overview of the project]

[0007]

[0007] The technical problem to be solved by the present invention is to provide a draft shield and an electronic balance equipped with a draft shield in order to overcome the disadvantages of the prior art, in which the method of connecting the windshield cylinder and the top cover of the draft shield is very complex and maintenance is troublesome.

[0008]

[0008] The present invention solves the above technical problems through the following technical solutions.

[0009] The present invention relates to a draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two cylinders arranged vertically and connected to the upper cover and the bottom shell, wherein the bottom end surface of the upper cover comprises at least one first limiting portion and at least one second limiting portion, the first limiting portion projecting outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion projecting outward in a direction perpendicular to the direction of extension of the cylinder.

[0010] Each cylinder comprises a first end portion and a second end portion, the first end portion comprising at least one first limiting hole and at least one second limiting hole,

[0011] A draft shield is provided, characterized in that a first restricting portion is connected to a corresponding first restricting hole, a second restricting portion is connected to a corresponding second restricting hole, a cylinder is detachably connected to the upper cover, and the second end portion of the cylinder is fixedly connected to the bottom shell.

[0009]

[0012] The present invention relates to a draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two vertically positioned cylinders connected to the upper cover and the bottom shell, wherein the upper end surface of the bottom shell comprises at least one first limiting portion and at least one second limiting portion.

[0013] The first limiting portion projects outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion projects outward in a direction perpendicular to the direction of extension of the cylinder, and each cylinder comprises a first end portion and a second end portion, the first end portion comprising at least one first limiting hole and at least one second limiting hole,

[0014] The present invention further provides a draft shield characterized in that a first restricting portion is connected to a corresponding first restricting hole, a second restricting portion is connected to a corresponding second restricting hole, a cylinder is detachably connected to the bottom shell, and a second end portion of the cylinder is fixedly connected to the top cover.

[0010]

[0015] The present invention relates to a draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two vertically positioned cylinders connected to the upper cover and the bottom shell, wherein the bottom end surface of the upper cover and the upper end surface of the bottom shell each comprise at least one first limiting portion and at least one second limiting portion.

[0016] The first limiting portion projects outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion projects outward in a direction perpendicular to the direction of extension of the cylinder, and each cylinder comprises a first end portion and a second end portion, each of the first end portion and the second end portion comprising at least one first limiting hole and at least one second limiting hole,

[0017] Further providing a draft shield characterized in that a first restricting portion is connected to a corresponding first restricting hole, and a second restricting portion is connected to a corresponding second restricting hole, thereby detachably connecting the cylinder to the upper cover and the bottom shell.

[0011]

[0018] According to embodiments of the present invention, the first end portion of the cylinder further comprises a side portion for positioning a second limiting hole.

[0019] According to an embodiment of the present invention, the upper cover comprises two mounting posts and a crossbeam arranged parallel to each other, the mounting posts being connected to each other by the crossbeam, the first limiting portion being positioned on each mounting post, and the second limiting portion being positioned on each mounting post.

[0012]

[0020] According to embodiments of the present invention, the cylinder has a hollow cylindrical structure.

[0021] According to embodiments of the present invention, the first limiting portion is cylindrical, and the first limiting hole is circular.

[0013]

[0022] According to embodiments of the present invention, the second limiting portion comprises a limiting bump, the mounting base is positioned on the bottom end surface of the upper cover, the mounting base comprises a first side surface and a second side surface, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in accordance with the corresponding second limiting hole.

[0014]

[0023] According to embodiments of the present invention, the second limiting portion comprises a limiting bump, the mounting base is positioned on the upper end surface of the bottom shell, the mounting base comprises a first side surface and a second side surface, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in accordance with the corresponding second limiting hole.

[0015]

[0024] According to embodiments of the present invention, the second limiting portion comprises a limiting bump, the mounting base is positioned on the bottom end surface of the upper cover, the mounting base comprises a first side surface and a second side surface, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in accordance with the corresponding second limiting hole.

[0025] The mounting base is disposed on the upper end surface of the bottom shell, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is correspondingly connected to the corresponding second limiting hole.

[0016]

[0026] According to an embodiment of the present invention, at least one reinforcing rib is disposed between the second side surface of the mounting base and the corresponding upper cover or bottom shell.

[0027] According to an embodiment of the present invention, the position locking boss is disposed on the upper cover or the bottom shell, the position locking boss is positioned on the side close to the mounting base, and is configured to limit the position of the cylinder.

[0017]

[0028] According to an embodiment of the present invention, the first end surface of the position locking boss is configured as an inclined surface, the first end surface faces the second limiting portion, and the inclined surface inclines from the topmost to the bottommost.

[0018]

[0029] According to an embodiment of the present invention, the limiting groove is provided in the upper cover or the bottom shell, the limiting groove further includes a limiting wall, the limiting groove is positioned on the side close to the limiting bump,

[0030] The first limiting portion is rotatably connected to the first limiting hole, the cylinder is rotatable in the limiting groove, when the cylinder is in the locked position, there is a distance between the cylinder and the limiting wall of the limiting groove, and when the cylinder is in the unlocked position, the cylinder abuts against the limiting wall of the limiting groove.

[0019]

[0031] According to an embodiment of the present invention, the limiting groove is configured as a notch.

[0032] The present invention further provides an electronic weighing scale, which comprises the draft shield and the weighing scale body described above, and the draft shield is mounted on the weighing scale body.

[0020]

[0033] The present invention has the following positive and progressive effects.

[0034] In the draft shield according to the present invention and the electronic balance equipped with the draft shield, the traditional method of fixing the cylinder to the upper cover by a screw and a connecting plate is optimized for an effective connection method through the mutual engagement between the opening in the cylinder and the boss of the upper cover.

[0021]

[0035] The draft shield implements an effective connection through the mutual engagement between the opening in the cylinder and the boss of the upper cover, thereby fixing the cylinder to the upper cover and solving the problems of the complex assembly process of the existing structure and the long assembly time of the production line.

[0022]

[0036] Furthermore, the draft shield for the balance further has advantages such as improving production efficiency, reducing costs, and facilitating maintenance and replacement by after-sales staff.

[0023]

[0037] The above and other features, characteristics, and advantages of the present invention will become apparent from the following description in conjunction with the accompanying drawings and embodiments, and the same features are always indicated by the same reference numerals in the drawings.

Brief Description of the Drawings

[0024] [Figure 1] It is a schematic structural diagram of an embodiment of an electronic balance according to the present invention. [Figure 2] It is a schematic structural diagram of an embodiment of a draft shield according to the present invention. [Figure 3] It is a schematic exploded view of an embodiment of a draft shield according to the present invention. [Figure 4] It is a schematic structural diagram of the assembly position of a cylinder in an embodiment of a draft shield according to the present invention. [Figure 5] It is a schematic structural diagram of the assembly position of an upper cover in an embodiment of a draft shield according to the present invention. [Figure 6] It is a schematic structural diagram of the assembly positions of a cylinder and an upper cover in an embodiment of a draft shield according to the present invention. [Figure 7]This is a schematic diagram of the arrangement configuration of reinforcing ribs in an embodiment of the draft shield according to the present invention. [Figure 8] This is a schematic diagram of the cylinder and upper cover in an embodiment of the draft shield according to the present invention during assembly, in the state before rotation and locking. [Figure 9] This is a schematic diagram of the cylinder and upper cover in an embodiment of the draft shield according to the present invention during assembly, in the state after rotation and locking. [Figure 10] This is a partial cross-sectional view of the cylinder and upper cover in an embodiment of the draft shield according to the present invention during assembly after rotation and locking. [Modes for carrying out the invention]

[0025]

[0038] To further clarify and facilitate understanding of the above-mentioned objectives, features, and advantages of the present invention, specific implementations of the invention are described in detail below in conjunction with the accompanying drawings.

[0039] Embodiments of the present invention are described herein in detail with reference to the accompanying drawings. Hereinafter, examples will be referenced in detail to preferred embodiments of the present invention shown in the accompanying drawings. Wherever possible, the same reference numerals used in all accompanying drawings indicate the same or similar parts.

[0026]

[0040] Furthermore, while the terms used in this invention are selected from well-known general terms, some of the terms used in this description may be selected by the applicant at their discretion, and their detailed meanings are explained in the relevant sections of this specification.

[0027]

[0041] Furthermore, the present invention must be understood not only by the actual terminology used, but also by the meanings encompassed by each term.

[0042] As shown in Figure 1, the present invention discloses an electronic balance comprising a draft shield 100 and a balance body 200, the draft shield 100 being attached to the balance body 200. In the prior art, a cylinder is secured to a top cover by screws and connecting plates. One end portion of the cylinder and the top cover are securely connected to each other, and the other end portion of the cylinder and the bottom shell are assembled to form a completed draft shield.

[0028]

[0043] In such a structure, screws are required to secure the cylinders to the top cover of the windshield, and metal plate components are also required to fix the positions of the left and right cylinders relative to the windshield. This mounting method is very complex, involves many parts, and does not facilitate future maintenance.

[0029]

[0044] Therefore, the present invention improves the mounting structure of the cylinder and upper cover within the draft shield 100, achieving mounting stability and convenience. The specific structure of the draft shield 100 in the present invention will be described in detail below.

[0030]

[0045] As shown in Figures 2 and 3, the draft shield 100 disclosed in the present invention comprises an upper cover 110, a bottom shell 120 positioned opposite the upper cover, and at least two cylinders 130 arranged vertically and connected to the upper cover 110 and the bottom shell 120. Each cylinder 130 comprises a first end portion and a second end portion. Each first end portion of the cylinder 130 is detachably connected to the upper cover 110, for example, by engagement or rotational connection. Each second end portion of the cylinder 130 is fixedly connected to the bottom shell 120, for example, by screws or other fixed connecting members, thereby fixedly connecting the cylinder 130 to the bottom shell 120.

[0031]

[0046] Alternatively, the technical solution of this application may also be provided as follows: A first end portion of the cylinder 130 is detachably connected to the bottom shell 120, for example, by engagement or rotational connection. A second end portion of the cylinder 130 is fixedly connected to the top cover 110, for example, by screws or another fixed connecting member, thereby fixedly connecting the cylinder 130 to the top cover 110.

[0032]

[0047] Alternatively, the technical solution of this application may also be provided as follows: Each of the two end portions of the cylinder 130 is detachably connected to the upper cover 110 and the bottom shell 120, respectively, by, for example, engagement or rotational connection.

[0033]

[0048] With the above mounting method, the cylinder 130 is positioned parallel to each other at the end portions of the upper cover 110 and the bottom shell 120. The upper cover 110, the bottom shell 120, and the cylinder 130 form a frame structure, and the windshield is positioned around the frame structure.

[0034]

[0049] All of the above-described implementations can achieve the objectives of the present invention and fall within the scope of protection of this application. Since all of the above-described implementations are based on a single principle, the following detailed description will be mainly given by illustrating an example in which the cylinder 130 is detachably connected to the upper cover 110 and fixedly connected to the bottom shell 120.

[0035]

[0050] Referring to Figures 4 and 5, in this embodiment, the bottom end surface of the top cover 110 comprises at least one first limiting portion 111 and at least one second limiting portion 112. The first limiting portion 111 projects outward in a direction parallel to the direction of extension of the cylinder, for example, projecting downward along the bottom end surface of the top cover 110 (only the first limiting portion 111 on one side of the top cover 110 is shown in Figure 5, but in reality the structure on the other side is the same symmetrical structure). Each end portion of the cylinder 130 comprises at least one first limiting hole 131 (only the structure of one cylinder 130 is shown in Figure 4, but the other cylinder 130 has the same structure). The first limiting portion 111 is attached to the corresponding first limiting hole 131, and the structures of the first limiting portion 111 and the first limiting hole 131 correspond to each other.

[0036]

[0051] The bottom end surface of the upper cover 110 further comprises a second limiting portion 112. The second limiting portion 112 projects outward in a direction perpendicular to the direction of extension of the cylinder 130, for example, projecting toward the side portion along the bottom end surface of the upper cover 110 of the draft shield (only the second limiting portion 112 on one side of the upper cover 110 is shown in Figure 5, but in reality the structure on the other side is the same symmetrical structure). Each first end portion of the cylinder 130 further comprises a side portion for positioning the second limiting hole 132 (only the structure of one cylinder 130 is shown in Figure 4, but the other cylinder 130 is the same structure). The second limiting portion 112 is connected to the corresponding second limiting hole 132, and the structures of the second limiting portion 112 and the second limiting hole 132 correspond to each other.

[0037]

[0052] In some embodiments, the structure of the upper cover 110 may preferably be configured to include two mounting posts 113 and a crossbeam 114 arranged parallel to each other. The mounting posts 113 are connected to each other by the crossbeam 114. A first limiting portion 111 is positioned on each of the two mounting posts 113, and a second limiting portion 112 is positioned on each of the two mounting posts 113.

[0038]

[0053] The cylinder 130 has a hollow cylindrical structure. Thus, the first limiting portion 111 is mounted in the first limiting hole 131 so as to be rotatably connected to the first limiting hole 131, thereby rotatably mounting the cylinder 130 to the upper cover 110.

[0039]

[0054] Referring again to Figures 4-6, in some embodiments, the first limiting portion 111 is rotatably connected to the first limiting hole 131, the first limiting portion 111 may preferably be cylindrical in shape, and the first limiting hole 131 may preferably be circular in shape. Of course, this is merely an example, and other connection structures that can implement rotation may implement the technical solutions of the present invention and fall within the scope of protection of the present invention.

[0040]

[0055] In some embodiments, the second limiting portion 112 may preferably include a limiting bump 116. The mounting base 115 is positioned on the bottom end surface of the upper cover 110. For example, in this embodiment, the mounting base 115 is positioned on the corresponding mounting post 113. The mounting base 115 comprises a first side surface and a second side surface. The limiting bump 116 is fixed to the first side surface of the mounting base 115, thereby connecting to the corresponding second limiting hole 132. Multiple reinforcing ribs 117 are positioned between the second side surface of the mounting base 115 and the corresponding mounting post 113.

[0041]

[0056] Of course, when the bottom shell 120 is detachably connected to the cylinder 130, the mounting base 115 is also positioned on the bottom shell 120, and the limiting bump 116 is fixed to one side surface of the mounting base 115, thereby connecting to the corresponding second limiting hole 132. Multiple reinforcing ribs 117 are positioned between the second side surface of the mounting base 115 and the corresponding mounting posts 113.

[0042]

[0057] Similarly, when the upper cover 110 and the bottom shell 120 are both detachably connected to the cylinder 130, the mounting base 115 is mounted on the upper cover 110 and the bottom shell 120, respectively, and the limiting bump 116 is fixed to one side surface of the mounting base 115, thereby connecting to the corresponding second limiting hole 132. Multiple reinforcing ribs 117 are positioned between the other side surface of the mounting base 115 and the corresponding mounting posts 113.

[0043]

[0058] The structural principles described above are the same and fall within the scope of protection of this application. Only embodiments are given herein as examples, and those skilled in the art should be able to understand the evolution of the other two structural modes.

[0044]

[0059] In this embodiment, requirements for the strength, packaging, and transport protection of the draft shield can be met by adjusting design parameters such as the thickness, shape, and width of the mounting base 115 and the limiting bump 116. The structure of the cylinder 130 that matches the mounting base and limiting bump also needs to be adjusted accordingly.

[0045]

[0060] An example of the mounting base 115 is given below, referring to specific data from actual tests.

[0061] For example, the mounting base 115 according to an embodiment of the present invention has a length of 27 mm, a wall thickness of 2.2 mm, and a height of 16 mm. In actual tests, it is found that the wall thickness of the mounting base 115 has the greatest effect on the tensile strength. The approximate relationship between the wall thickness of the mounting base 115 and the maximum tensile force that can be withstood at the joint of the cylinder is as follows:

[0046]

[0062] When the wall thickness of the mounting base 115 is 0 to 1 mm, the maximum tensile force ranges from 0 to 300 N. When the wall thickness of the mounting base 115 is 1 to 2 mm, the maximum tensile force ranges from 300 to 800 N. When the wall thickness of the mounting base 115 is 2 to 3 mm, the maximum tensile force ranges from 800 to 1200 N. When the wall thickness of the mounting base 115 is 3 mm or more, the maximum tensile force range is 1200 N or more.

[0047]

[0063] An example of the limiting bump 116 is given below, referring to specific data from actual tests.

[0064] For example, the limiting bump 116 according to an embodiment of the present invention has a length of 22 mm, a width of 3.7 mm, and a height of 2 mm. In actual tests, it was found that the width of the limiting bump 116 has the greatest effect on the tensile strength, and the approximate relationship between the width of the limiting bump 116 and the maximum tensile force that can be withstood at the joint of the cylinder is as follows:

[0048]

[0065] When the width of the limiting bump 116 is 0 to 1 mm, the maximum tensile force ranges from 0 to 350 N. When the width of the limiting bump 116 is 1 to 2 mm, the maximum tensile force ranges from 350 to 950 N. When the width of the limiting bump 116 is 2 to 4 mm, the maximum tensile force ranges from 950 to 1500 N. When the width of the limiting bump 116 is 4 mm or more, the maximum tensile force range is 1500 N or more.

[0049]

[0066] The limiting bump 116 according to this specification may preferably be an elliptical strip structure, a circular strip structure, or a polygonal strip structure. The shape of the second limiting hole 132 matches the shape of the limiting bump 116. When the cylinder 130 is assembled with the upper cover 110, the limiting bump 116 is correspondingly secured by the second limiting hole 132.

[0050]

[0067] Of course, this is merely an example as specified herein. The shapes of the limiting bump 116 and the second limiting hole 132 are not limited to elliptical or the shapes described above, and they need to match each other according to the actual requirements. Other achievable engagement structures that can implement the technical solutions of the present invention fall within the scope of protection of the present invention.

[0051]

[0068] As shown in Figure 7, the requirements for the strength, packaging, and transport protection of the draft shield can be met by adjusting the shape, number, thickness, and arrangement of the reinforcing ribs 117.

[0052]

[0069] For example, five reinforcing ribs 117 may preferably be present according to embodiments of the present invention, the reinforcing ribs 117 having a thickness of 2 mm, being parallel, uniformly spaced, and having the shape of a beveled triangular rib structure. In particular, requirements for the strength, packaging, and transport protection of the draft shield can be met by adjusting the number, thickness, arrangement, and shape of the reinforcing ribs 117.

[0053]

[0070] In some embodiments, the upper cover 110 or the bottom shell 120 may further include a position locking boss 118. For example, in this embodiment, the position locking boss 118 is located on the mounting post 113 of the upper cover 110, positioned on the side adjacent to the mounting base 115, and configured to restrict the position of the cylinder 130. The first end surface 1181 of the position locking boss 118 may preferably be configured as an inclined surface, which faces the second restricting portion 112 such that a restricting groove is formed between the first end surface 1181 and the second restricting portion 112. For example, the inclined surface in this embodiment may be configured to be inclined from the top to the bottom, and the inclination angle of the inclined surface may be set to 45° or 60°.

[0054]

[0071] In this embodiment, the position locking boss 118 may preferably have a structure with a protruding inclined surface. Of course, the position locking boss 118 may also be an arc-shaped boss, a cylindrical boss, a square boss, or have other shapes and structures that can achieve the purpose of locking, all of which fall within the scope of protection of this application.

[0055]

[0072] Furthermore, the upper cover 110 or the bottom shell 120 may further include a limiting groove 119. For example, in this embodiment, the crossbeam 114 of the upper cover 110 includes a limiting groove 119. For example, the limiting groove 119 may preferably be configured as a notch. In this embodiment, the limiting groove 119 is located at the joint between the crossbeam 114 and the mounting post 113 and is configured to control the rotation angle of the cylinder 130. The limiting groove 119 has a limiting wall 1191.

[0056]

[0073] The first limiting portion 111 is rotatably connected to the first limiting hole 131, and the cylinder 130 can rotate within the limiting groove 119. When the cylinder 130 is in the locked position, there is a distance between the cylinder 130 and the limiting wall 1191 (shown in Figure 9). When the cylinder 130 is in the unlocked position, the cylinder 130 abuts against the limiting wall 1191 (shown in Figure 8).

[0057]

[0074] The rotation angle of the cylinder 130 during installation can be adjusted by adjusting the shape and width of the limiting groove 119. Furthermore, a corresponding notch may also be designed in the cylinder 130 as the limiting groove 119, if a avoidance function can be achieved. These structures fall within the scope of protection of this application.

[0058]

[0075] As shown in Figures 8-10, during the installation of the cylinder 130 and the upper cover 110, the second limiting portion 112 and the first limiting portion 111 pass through the hollow structure at the end of the cylinder 130, and the specific installation process is as follows:

[0059]

[0076] The upper cover 110 and the cylinder 130 are first held by hand, and the first limiting hole 131 of the cylinder 130 is aligned with the first limiting portion 111 of the upper cover 110, so that the first limiting portion 111 is inserted into the first limiting hole 131 to form a rotatable connection. The cylinder 130 is pre-positioned beforehand.

[0060]

[0077] Subsequently, the cylinder 130 is tilted slightly to avoid the position locking boss 118. Furthermore, the cylinder 130 is rotated clockwise around the first limiting portion 111 so that the second limiting portion 112 of the upper cover 110 is fitted into the second limiting hole 132 within the cylinder 130.

[0061]

[0078] When the second limiting hole 132 is secured by the second limiting portion 112, the outer wall of one side of the cylinder 130 is firmly engaged with the position locking boss 118. Such a structure effectively restricts the movement of the cylinder 130, thereby making the connection between the cylinder 130 and the upper cover 110 more stable.

[0062]

[0079] The cylinder 130 is then returned to its correct position. At this point, the cylinder 130 and the upper cover 110 are effectively connected.

[0080] According to the above structural description, in the process of mounting the cylinder 130 and rotating the cylinder clockwise, the limiting groove 119 and the position locking boss 118 are specifically designed on the upper cover 110. The limiting groove 119 can control the cylinder 130 to rotate within a certain angle, and the position locking boss 118 can ensure that the cylinder 130 is securely connected to the upper cover 110, so that the cylinder is less likely to retract.

[0063]

[0081] Given the specific nature of the application environment for the draft shield, high stability is required. Therefore, in the embodiments of this application, depending on the actual situation, the strength of the overall structure of the product is improved by adjusting the external dimensions of the second limiting portion 112 of the upper cover 110, thereby meeting the requirements for the structural stability, function, packaging, and transport of the product. The second limiting portion 112 of the upper cover 110 cooperates with the second limiting hole 132 of the cylinder 130 so that the upper cover 110 and the cylinder 130 are stably connected together.

[0064]

[0082] Finally, the bottom shell 120 and the cylinder 130 are assembled together by screws, thereby forming a stable and reliable draft shield 100.

[0083] As described above, the draft shield according to the present invention aims to provide a simple, reliable, and convenient connection structure between a cylinder and an upper cover. The operator only needs to align the first limiting hole in the cylinder with the first limiting portion of the upper cover and then rotate the cylinder clockwise after insertion, so that the second limiting portion of the upper cover is clamped into the second limiting hole in the cylinder, and thus the position of the cylinder is fixed.

[0065]

[0084] When the cylinder needs to be disassembled, the top cover is held in place, and the cylinder is rotated counterclockwise to a certain angle, so that the cylinder can be easily and conveniently removed from the top cover.

[0066]

[0085] Such structures can be used to improve product reliability, save screws and sheet metal, improve production efficiency on the production line, and facilitate work by service and maintenance teams.

[0067]

[0086] Certain terms are used in this application to describe embodiments of this application. For example, “one embodiment,” “an embodiment,” and / or “some embodiments” mean certain features, structures, or characteristics relating to at least one embodiment of this application. It should be emphasized and noted that “embodiment,” “one embodiment,” or “an alternative embodiment” mentioned more than once in different places in the description do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0068]

[0087] While specific implementations of the present invention have been described above, those skilled in the art should understand that these are merely examples, and the scope of protection of the present invention is defined by the appended claims. Various changes and modifications to these implementations can be made by those skilled in the art without departing from the principles and essence of the present invention. However, all such changes and modifications fall within the scope of protection of the present invention. [Explanation of symbols]

[0069] 100 Draft Shield 200 Balance body 110 Top cover 120 Bottom Shell 130 cylinders 111 First Restriction 131 The first restriction hole 112 Second Restriction 132 Second restriction hole 113 Mounting Post 114 Crossbeam 115 Mounting base 116 Restriction Bump 117 Reinforcement Ribs 118 Position Locking Boss 1181 First end surface 119 Restriction groove 1191 Restriction Wall

Claims

1. A draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two cylinders arranged vertically and connected to the upper cover and the bottom shell, wherein the bottom end surface of the upper cover comprises at least one first limiting portion and at least one second limiting portion, the first limiting portion projecting outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion projecting outward in a direction perpendicular to the direction of extension of the cylinder. Each of the cylinders comprises a first end portion and a second end portion, the first end portion comprising at least one first limiting hole and at least one second limiting hole, A draft shield characterized in that the first restricting portion is connected to the corresponding first restricting hole, the second restricting portion is connected to the corresponding second restricting hole, the cylinder is detachably connected to the upper cover, and the second end portion of the cylinder is fixedly connected to the bottom shell.

2. A draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two cylinders arranged vertically and connected to the upper cover and the bottom shell, wherein the upper end surface of the bottom shell comprises at least one first limiting portion and at least one second limiting portion. The first limiting portion protrudes outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion protrudes outward in a direction perpendicular to the direction of extension of the cylinder, and each cylinder comprises a first end portion and a second end portion, the first end portion comprising at least one first limiting hole and at least one second limiting hole, A draft shield characterized in that the first restricting portion is connected to the corresponding first restricting hole, the second restricting portion is connected to the corresponding second restricting hole, the cylinder is detachably connected to the bottom shell, and the second end portion of the cylinder is fixedly connected to the upper cover.

3. A draft shield comprising an upper cover, a bottom shell positioned opposite the upper cover, and at least two cylinders arranged vertically and connected to the upper cover and the bottom shell, wherein the bottom end surface of the upper cover and the upper end surface of the bottom shell each comprise at least one first limiting portion and at least one second limiting portion. The first limiting portion protrudes outward in a direction parallel to the direction of extension of the cylinder, and the second limiting portion protrudes outward in a direction perpendicular to the direction of extension of the cylinder, and each cylinder comprises a first end portion and a second end portion, each of the first end portion and the second end portion comprises at least one first limiting hole and at least one second limiting hole, A draft shield characterized in that the first restricting portion is connected to the corresponding first restricting hole, and the second restricting portion is connected to the corresponding second restricting hole, thereby detachably connecting the cylinder to the upper cover and the bottom shell.

4. A draft shield according to any one of claims 1 to 3, wherein the first end portion of the cylinder further comprises a side portion for positioning the second limiting hole.

5. A draft shield according to any one of claims 1 to 3, wherein the upper cover comprises two mounting posts and a crossbeam arranged parallel to each other, the mounting posts being connected to each other by the crossbeam, the first limiting portion being positioned on the mounting posts, and the second limiting portion being positioned on the mounting posts.

6. A draft shield according to any one of claims 1 to 3, characterized in that the cylinder has a hollow cylindrical structure.

7. A draft shield according to any one of claims 1 to 3, characterized in that the first limiting portion is cylindrical and the first limiting hole is a circular hole.

8. A draft shield according to claim 1, wherein the second limiting portion comprises a limiting bump, the mounting base is positioned on the bottom end surface of the upper cover, the mounting base comprises a first side surface and a second side surface, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in correspondence with the corresponding second limiting hole.

9. A draft shield according to claim 2, wherein the second restricting portion comprises a restricting bump, the mounting base is positioned on the upper end surface of the bottom shell, the mounting base comprises a first side surface and a second side surface, the restricting bump is fixed to the first side surface of the mounting base, and the restricting bump is connected in correspondence with the corresponding second restricting hole.

10. A draft shield according to claim 3, wherein the second limiting portion comprises a limiting bump, the mounting base is positioned on the bottom end surface of the upper cover, the mounting base comprises a first side surface and a second side surface, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in correspondence with the corresponding second limiting hole. A draft shield characterized in that the mounting base is positioned on the upper end surface of the bottom shell, the limiting bump is fixed to the first side surface of the mounting base, and the limiting bump is connected in accordance with the corresponding second limiting hole.

11. A draft shield according to any one of claims 8 to 10, characterized in that at least one reinforcing rib is positioned between the second side surface of the mounting base and the corresponding upper cover or bottom shell.

12. A draft shield according to claim 11, wherein a position locking boss is further disposed on the upper cover or the bottom shell, and the position locking boss is positioned on a side adjacent to the mounting base and configured to restrict the position of the cylinder.

13. A draft shield according to claim 12, wherein the first end surface of the position locking boss is configured as an inclined surface, the first end surface faces the second limiting portion, and the inclined surface is inclined from the top to the bottom.

14. A draft shield according to any one of claims 8 to 10, wherein the limiting groove is provided in the upper cover or the bottom shell, the limiting groove further comprises a limiting wall, and the limiting groove is positioned on the side adjacent to the limiting bump, A draft shield characterized in that the first limiting portion is rotatably connected to the first limiting hole, the cylinder is rotatable within the limiting groove, there is a distance between the cylinder and the limiting wall of the limiting groove when the cylinder is in the locked position, and the cylinder abuts against the limiting wall of the limiting groove when the cylinder is in the unlocked position.

15. A draft shield according to claim 14, characterized in that the limiting groove is configured as a notch.

16. An electronic balance comprising a draft shield and a balance body according to any one of claims 1 to 15, wherein the draft shield is mounted on the balance body.

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