EP-4735851-A1 - DRAFT SHIELD AND ELECTRONIC BALANCE COMPRISING SAME

Abstract

The present invention provides a draft shield and an electronic balance comprising same. The draft shield comprises an upper cover, a bottom shell and at least two columns. A bottom end surface of the upper cover is provided with at least one first limiting portion and at least one second limiting portion. The first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns. The columns each comprise a first end portion and a second end portion, wherein the first end portion comprises 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 columns are fixedly connected to the bottom shell. The present invention has the advantages of improving the production efficiency, reducing the cost, facilitating maintenance and replacement by after-sales personnel, etc. by means of effective connection through mutual connection between openings in the columns and bosses of the upper cover.

Inventors

• WANG, Heqiao
• CHEN, XINGHONG
• ZHOU, MI
• MIN, Feng

Assignees

• Mettler-Toledo Instruments (Shanghai) Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240314

Claims (16)

1. A draft shield, comprising: an upper cover, a bottom shell positioned opposite the upper cover, and at least two columns arranged in a vertical direction and connected to the upper cover and the bottom shell; characterized in that a bottom end surface of the upper cover is provided with at least one first limiting portion and at least one second limiting portion, wherein the first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns; the columns each comprise a first end portion and a second end portion, wherein the first end portion comprises at least one first limiting hole and at least one second limiting hole; and the first limiting portion is connected to the corresponding first limiting hole and the second limiting portion is connected to the corresponding second limiting hole, so as to detachably connect the columns to the upper cover, and the second end portions of the columns are 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 columns arranged in a vertical direction and connected to the upper cover and the bottom shell; characterized in that an upper end surface of the bottom shell is provided with at least one first limiting portion and at least one second limiting portion, wherein the first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns; the columns each comprise a first end portion and a second end portion, wherein the first end portion comprises at least one first limiting hole and at least one second limiting hole; and the first limiting portion is connected to the corresponding first limiting hole and the second limiting portion is connected to the corresponding second limiting hole, so as to detachably connect the columns to the bottom shell, and the second end portions of the columns are 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 columns arranged in a vertical direction and connected to the upper cover and the bottom shell; characterized in that each of a bottom end surface of the upper cover and an upper end surface of the bottom shell is provided with at least one first limiting portion and at least one second limiting portion, wherein the first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns; the columns each comprise a first end portion and a second end portion, wherein 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; and the first limiting portion is connected to the corresponding first limiting hole and the second limiting portion is connected to the corresponding second limiting hole, so as to detachably connect the columns to the upper cover and the bottom shell.
4. The draft shield of any one of the claims 1 to 3, characterized in that the first end portion of the column further comprises a side portion for locating the second limiting hole.
5. The draft shield of any one of the claims 1 to 3, characterized in that the upper cover comprises two mounting posts arranged in parallel with each other and a cross beam, the mounting posts are connected to each other by means of the cross beam, the first limiting portion is respectively located on the mounting posts, and the second limiting portion is respectively located on the mounting posts.
6. The draft shield of any one of the claims 1 to 3, characterized in that the columns are of a hollow columnar structure.
7. The draft shield of any one of the claims 1 to 3, characterized in that the first limiting portion is a cylinder, and the first limiting hole is a circular hole.
8. The draft shield of claim 1, characterized in that the second limiting portion comprises a limiting bump, and a mounting base is arranged on the bottom end surface of the upper cover, the mounting base comprising a first side surface and a second side surface, wherein 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.
9. The draft shield of claim 2, characterized in that the second limiting portion comprises a limiting bump, and a mounting base is arranged on the upper end surface of the bottom shell, the mounting base comprising a first side surface and a second side surface, wherein 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.
10. The draft shield of claim 3, characterized in that the second limiting portion comprises a limiting bump, and a mounting base is arranged on the bottom end surface of the upper cover, the mounting base comprising a first side surface and a second side surface, wherein 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; and a mounting base is arranged 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.
11. The draft shield of any one of the claims 8 to 10, characterized in that at least one reinforcing rib is arranged between the second side surface of the mounting base and the corresponding upper cover or bottom shell.
12. The draft shield of claim 11, characterized in that a position locking boss is further arranged on the upper cover or the bottom shell, and the position locking boss is located on a side proximate to the mounting base, and is configured to limit the positions of the columns.
13. The draft shield of claim 12, characterized in that a 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 top to bottom.
14. The draft shield of any one of the claims 8 to 10, characterized in that a 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 located on a side proximate to the limiting bump; the first limiting portion is rotatably connected to the first limiting hole, and the columns are rotatable in the limiting groove, wherein when the columns are in a locked position, there is a distance between the columns and the limiting wall of the limiting groove; and when the columns are in an unlocked position, the columns abut against the limiting wall of the limiting groove.
15. The draft shield of claim 14, characterized in that the limiting groove is configured as a notch.
16. An electronic balance, characterized in that the electronic balance comprises a draft shield of any one of claims 1 to 15 and a balance body, and the draft shield is mounted on the balance body.

Description

DRAFT SHIELD AND ELECTRONIC BALANCE COMPRISING SAME BACKGROUND OF THE INVENTION Technical Field The present invention relates to the field of electronic balances, and in particular, to a draft shield and an electronic balance comprising same. Background Art An electronic balance is a balance that uses an electromagnetic force to balance and weigh a weight of an object. The electronic balance is characterized by accurate and reliable weighing, fast and clear display, and provision of an automatic testing system, a simple automatic calibration device, an overload protection device, etc. The electronic balance is usually suitable for industry, agriculture, commerce, schools, hospitals, scientific research and other units, and has certain requirements for sensitivity and stability. In these workplaces, weighing is easily affected by an external environment. Therefore, the electronic balance is usually provided with a draft shield, which becomes an essential part of the electronic balance. However, in the draft shield, an existing method of connection between a windshield column and a top cover of the balance is very complicated. Usually, a column is fixed to an upper cover by means of a screw and a connecting plate. The column and the upper cover are securely connected to each other, and are assembled into a complete draft shield together with a bottom shell. In such a structure, it is necessary to use screws to fix columns to the top cover of a windshield, and it is also necessary to use a metal plate component to fix the positions of left and right columns relative to the windshield. Since there are many parts involved, an assembly process is complicated, an assembly time of a production line is long, production line workers need a lot of time to complete assembly, and the cost is high. In addition, for an after-sales service team, later maintenance is more troublesome. In view of this, the inventor of the present application has designed a draft shield and an electronic balance comprising same in order to overcome the foregoing technical problems. SUMMARY The technical problem to be solved by the present invention is to provide a draft shield and an electronic balance comprising same, in order to overcome the disadvantages in the prior art that a method of connection between a windshield column and a top cover of a draft shield is very complicated and maintenance is cumbersome. The present invention solves the above technical problem through the following technical solution: The present invention provides a draft shield, comprising: an upper cover, a bottom shell positioned opposite the upper cover, and at least two columns arranged in a vertical direction and connected to the upper cover and the bottom shell; characterized in that a bottom end surface of the upper cover is provided with at least one first limiting portion and at least one second limiting portion, wherein the first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns; the columns each comprise a first end portion and a second end portion, wherein the first end portion comprises at least one first limiting hole and at least one second limiting hole; and the first limiting portion is connected to the corresponding first limiting hole and the second limiting portion is connected to the corresponding second limiting hole, so as to detachably connect the columns to the upper cover, and the second end portions of the columns are fixedly connected to the bottom shell. The present invention further provides a draft shield, comprising: an upper cover, a bottom shell positioned opposite the upper cover, and at least two columns arranged in a vertical direction and connected to the upper cover and the bottom shell; characterized in that an upper end surface of the bottom shell is provided with at least one first limiting portion and at least one second limiting portion, wherein the first limiting portion protrudes outwardly in a direction parallel to a direction of extension of the columns, and the second limiting portion protrudes outwardly in a direction normal to the direction of extension of the columns; the columns each comprise a first end portion and a second end portion, wherein the first end portion comprises at least one first limiting hole and at least one second limiting hole; and the first limiting portion is connected to the corresponding first limiting hole and the second limiting portion is connected to the corresponding second limiting hole, so as to detachably connect the columns to the bottom shell, and the second end portions of the columns are fixedly connected to the upper cover. The present invention further provides a draft shield, comprising: an upper cover, a bottom shell positioned opposite the upper cover, and at least two columns arranged in a vertical dir