Balance fan housing grounding structure and electronic balance

Abstract

The balance fan cover grounding structure comprises a balance body, a fan cover bottom shell and a grounding elastic piece, a metal plate is arranged on the fan cover bottom shell, the grounding elastic piece is used for conducting the metal plate and the balance body, the fan cover bottom shell comprises a clamping part and a through hole, the balance body comprises an electric conductor, and the grounding elastic piece comprises a base body, a first cantilever and a second cantilever. Part of the first cantilever passes through the through hole to contact the metal plate, the second cantilever is used for abutting against the conductor, and the clamping part is used for clamping and fixing the grounding elastic sheet. The balance fan housing grounding structure is simple to assemble and easy to operate, and the grounding quality is controllable. The invention also provides an electronic balance.

Description

Technical Field

[0001] The invention relates to the field of electronic balances, in particular to the field of grounding structures of wind shields of electronic balances. Background Art

[0002] A grounding spring is generally installed inside the electronic balance to connect the metal plate on the bottom shell of the balance wind shield and the balance body, thereby conducting the static electricity in the wind shield system, thereby preventing the static electricity from affecting the weighing performance of the balance. In the existing electronic balance structure, the grounding spring is usually fixed to the wind shield shell by hot melting to complete the grounding function. The hot melting method is to use high temperature to heat the plastic to melt after the plastic parts of the balance wind shield bottom shell are ejected from the mold, so that the grounded sheet metal spring is fixed to the wind shield shell. On the one hand, this method increases the difficulty of the process and increases the cost. On the other hand, the quality of hot melting is difficult to control, and there is a quality risk.

[0003] In view of this, it is necessary to propose a balance wind shield grounding structure to solve the problems of high cost and uncontrollable quality caused by the hot melting process of the grounding spring. Summary of the invention

[0004] An object of the present invention is to provide a balance wind shield grounding structure, which can effectively reduce costs and make the grounding quality controllable.

[0005] To achieve the above-mentioned purpose, a balance wind shield grounding structure includes a balance body, a wind shield bottom shell and a grounding spring piece, wherein a metal plate is provided on the wind shield bottom shell, and the grounding spring piece is used to conduct electricity between the metal plate and the balance body, the wind shield bottom shell includes a clamping portion and a through hole, and the balance body includes a conductor; the grounding spring piece includes a base, a first cantilever and a second cantilever, a portion of the first cantilever passes through the through hole to contact the metal plate, and the second cantilever is used to resist the conductor; the clamping portion is used to clamp and fix the grounding spring piece.

[0006] In one or more embodiments, the clamping portion includes a protruding structure and a clamping structure, the base includes a positioning hole, the positioning hole is used to cooperate with the protruding structure, and the clamping structure is used to clamp at least a portion of the base to jointly limit the grounding spring sheet.

[0007] In one or more embodiments, a protruding extension wall is provided on the bottom shell of the wind shield, and the extension wall is provided with a snap-fit ​​groove, and the snap-fit ​​groove forms at least a part of the snap-fit ​​structure to vertically limit the grounding spring sheet.

[0008] In one or more embodiments, a first groove is provided on the bottom shell of the wind shield, facing the locking groove to form the locking structure together.

[0009] In one or more embodiments, at least a portion of the base is recessed in a lateral direction perpendicular to the plane where the base is located, forming a second groove for inserting into the engaging groove.

[0010] In one or more embodiments, the extension wall is further provided with a limiting portion for horizontally limiting the grounding spring sheet.

[0011] In one or more embodiments, the limiting portion is a limiting wall or a limiting cavity surrounded by the extending wall.

[0012] In one or more embodiments, the first cantilever includes a bent portion disposed in the middle or at an end portion, and the bent portion is used to pass through the through hole.

[0013] In one or more embodiments, the base further includes an operating portion extending from an end portion of the base.

[0014] In one or more embodiments, the operating portion further includes an arch, and after the grounding spring sheet is assembled, the operating portion is interference-fitted with the wind shield bottom shell by means of the arch.

[0015] Another object of the present invention is to provide an electronic balance, which includes a wind shield structure, a balance body and a weighing assembly. The wind shield structure includes a wind shield bottom shell and a metal plate. The electronic balance uses the above-mentioned balance wind shield grounding structure to connect the metal plate and the balance body.

[0016] The above-mentioned balance wind hood grounding structure realizes multi-dimensional fixation of the balance wind hood grounding spring by setting a clamping part, specifically through the clamping structure and the connection between the positioning hole and the protruding structure. The static electricity on the wind hood shell of the electronic balance is effectively eliminated through the contact between the first cantilever and the second cantilever and the metal plate and the conductor. Compared with the hot melt method or the fastener threaded fastening method, the overall structure of this mechanical structure is simple, the assembly process is simplified, and the problems of high cost and uncontrollable quality brought by the existing hot melt process are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0018] Figure 1 It is a schematic diagram of the overall structure of the balance;

[0019] Figure 2 This is a disassembled diagram of some of the components of the balance;

[0020] Figure 3 This is the bottom structure diagram of the wind shield bottom shell;

[0021] Figure 4It is a schematic diagram of the grounding spring and the bottom shell of the wind shield being in a locked state;

[0022] Figure 5 It is a schematic diagram of the grounding spring and the bottom shell of the wind shield being in a separated state;

[0023] Figure 6 is a schematic diagram of an embodiment of a grounding spring;

[0024] Figure 7 is an oblique view of an embodiment of a grounding spring;

[0025] Figure 8 is a side view of an embodiment of a grounding spring;

[0026] Fig. 9 It is a side cross-sectional view of the grounding structure of the balance wind shield;

[0027] Fig.10 is a side cross-sectional view of an embodiment of a snap-fit ​​structure;

[0028] Fig.11 It is a schematic diagram of the second cantilever and the conductor being in abutting state.

[0029] Symbols and Markings

[0030] 10 balance body

[0031] 11 Conductors

[0032] 20 Fan cover bottom shell

[0033] 21. Card connection

[0034] 22 Raised structure

[0035] 23 snap-fit ​​structure

[0036] 24 Through Holes

[0037] 25 Extended Wall

[0038] 27 First groove

[0039] 30 Grounding spring

[0040] 31 First cantilever

[0041] 32 Second cantilever

[0042] 33 Matrix

[0043] 40 Weighing components

[0044] 50 Wind shield structure

[0045] 51 Metal Plate

[0046] 251 snap-in slot

[0047] 252 Chamber

[0048] 253 Limiting part

[0049] 255 Limit wall

[0050] 319 Bending Department

[0051] 321 sinking section

[0052] 322 contact segment

[0053] 331 Positioning hole

[0054] 332 Second groove

[0055] 333 Operation Department

[0056] 3331 Arch DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0058] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0059] like Figure 1 and Figure 2 As shown, the electronic balance includes a hood structure 50, a balance body 10 and a weighing assembly 40. The weighing assembly 40 is arranged on a weighing sensor in the balance body 10, and the hood structure 50 includes a hood upper cover 59, a hood bottom shell 20, a plurality of hood columns 58 and a metal plate 51 located in the hood bottom shell 20. One end of the hood columns 58 is detachably connected to the hood upper cover 59, such as by snap connection or rotation connection, etc. The other end of the hood column 58 is fixedly connected to the hood bottom shell 20, such as by screws or other fixed connectors. Through the above-mentioned installation method, the hood columns 58, the hood bottom shell 20 and the hood upper cover 59 form a frame structure, and the windshield is surrounded by the four sides of the frame structure.

[0060] The electronic balance needs to conduct away the static electricity in the wind shield structure 50. By providing a grounding spring that conducts the metal plate 51 on the bottom shell of the balance wind shield and the balance body 10, the influence of static electricity on the weighing performance of the balance can be effectively prevented.

[0061] The grounding spring is usually fixed to the hood shell by hot melting, which has the problems of high cost and uncontrollable quality; in some cases, it is also fixed to the hood shell by fastening with fasteners, but the assembly and disassembly are relatively cumbersome. The balance hood grounding structure disclosed in the present invention fixes the grounding spring by a simplified mechanical structure, reduces the difficulty of assembly, ensures the assembly quality and effectively reduces the cost.

[0062] Reference Figures 3 to 5 The bottom view of the grounding structure shown in the figure shows that the balance wind shield grounding structure includes a balance body 10, a wind shield bottom shell 20 and a grounding spring 30 that cooperate with each other. The wind shield bottom shell 20 is provided with a metal plate 51, and the grounding spring 30 is used to connect the metal plate 51 and the balance body 10. The balance body 10 includes a conductor 11, which can be a screw. The wind shield bottom shell 20 includes a clamping portion 21 and a through hole 24, and the clamping portion 21 is used to clamp and fix the grounding spring 30.

[0063] Grounding spring 30 Figures 6 to 8 As shown, it includes a base 33, a first cantilever 31 and a second cantilever 32. The base 33 is a sheet-like structure with elasticity, which can be a planar structure or a non-planar structure. The first cantilever 31 and the second cantilever 32 are cantilever beam structures extending from the end of the base. A portion of the first cantilever 31 passes through the through hole 24 to contact the metal plate 51. Figure 6 and Figure 7 In the illustrated embodiment, the first cantilever 31 passes through the through hole 24 on the wind shield bottom shell 20 via the bent portion 319, and the bent portion 319 can be arranged in the middle or end of the first cantilever 31. The second cantilever 32 is used to abut against the conductor 11, and the grounding spring 30 conducts electricity between the metal plate 51 and the balance body 10 by means of the first cantilever 31 and the second cantilever 32.

[0064] Continue to refer to Figure 6 and Figure 7 As shown, in some embodiments, the second cantilever 32 includes a sinking section 321 and a contact section 322. The sinking section 321 extends from the end of the base 33, and the extending direction forms an acute angle with the plane where the base 33 is located, such as Figure 8 The contact section 322 is parallel to the plane where the substrate 33 is located, and is used to abut the conductor 11. Therefore, the force exerted by the conductor 11 on the second cantilever 32 is opposite to the force exerted by the metal plate 51 on the first cantilever 31.

[0065] An embodiment of the clamping portion 21 on the wind shield bottom shell 20 is as follows Figure 4 and Figure 5 As shown, it includes a protruding structure 22 and a snap-fit ​​structure 23. For example, the wind shield bottom shell 20 can be integrally formed with the protruding structure 22, the snap-fit ​​structure 23 and the through hole 24 by mold injection molding.

[0066] An embodiment of the snap-fit ​​structure 23 is shown in FIG. Figure 4 and Figure 5 It is understood that the fan cover bottom shell 20 is provided with a protruding extension wall 25, and the extension wall 25 is provided with a snap-fitting groove 251, which forms at least a part of the snap-fitting structure 23 to vertically limit the grounding spring 30. The snap-fitting groove 251 can be formed by slotting the extension wall 25 body, or by setting Figure 5 The hanging wall with the bottom part missing as shown is formed. The hanging wall and the surface where the wind shield bottom shell 20 is located jointly define the snap-fit ​​structure 23, or the first groove 27 located on the wind shield bottom shell 20 opposite to the snap-fit ​​groove 251 jointly forms the snap-fit ​​structure 23. The extension wall 25 can be formed integrally with the wind shield bottom shell 20 by mold injection. The base 33 is snapped into the snap-fit ​​groove 251 to fix the grounding spring sheet 30 in a direction perpendicular to the grounding spring sheet.

[0067] In some embodiments, at least a portion of the base 33 is recessed in a direction perpendicular to the plane of the base, such as Fig.10 As shown in the upper side, a second groove 332 for inserting into the engaging groove 251 is formed to improve the stability with the engaging groove 251 .

[0068] In order to adapt to the protruding structure 22, the base 33 of the grounding spring is provided with a positioning hole 331, and the protruding structure 22 extends into the positioning hole 331 to realize the horizontal positioning of the base. Figure 5 Two circular positioning holes 331 are designed on the base of the grounding spring piece shown, and two raised cylinders are designed on the bottom shell 20 of the wind shield as the raised structures 22. After the second groove 332 is inserted into the snap-fit ​​groove 251, the two raised cylinders can be inserted into the two circular holes, so that the grounding spring piece is fixed relative to the front, back, left, and right positions on the bottom shell of the wind shield, that is, in the direction along the plane where the base is located. The raised structure 22 and the snap-fit ​​structure 23 jointly limit the grounding spring piece 30 in the horizontal direction and the vertical direction of the grounding spring piece, respectively, and fix the grounding spring piece 30 on the bottom shell 20 of the wind shield.

[0069] Back to Figure 4 and Figure 5 The extension wall 25 is also provided with a limiting portion 253, which can be a limiting wall 255 or a limiting cavity 252 surrounded by the extension wall 25 to horizontally limit the grounding spring 30. The wind shield bottom shell 20 can include a plurality of extension walls 25, and some of the extension walls 25 bodies play the role of limiting walls 255, such as Figure 4 As shown, the two sides of the grounding spring 30 respectively abut against a pair of limiting walls 255. Part of the limiting walls 255 can also enclose a limiting cavity 252, which can accommodate the second cantilever 32 as a whole, avoiding damage to the second cantilever 32 during the installation process, and playing a protective role.

[0070] The limiting portion 253 and the engaging groove 251 can be arranged on the same limiting wall 255, or can be arranged independently. Figure 4 The limiting walls respectively limit the lower side and the upper side of the grounding spring piece 30.

[0071] Under this structure, the assembled grounding spring 30 is subjected to various forces. Figure 8 , Fig. 9 and Fig.11 understand, Fig. 9 In the figure, the solid line indicates the position of the first cantilever 31 in a naturally stress-free state, and the dotted line indicates the position of the first cantilever 31 after the metal plate 51 contacts and squeezes the bent portion 391 in the assembled state. Fig.11 In the figure, the solid line indicates the position of the second cantilever 32 in a naturally stress-free state, and the dotted line indicates the position of the second cantilever 32 after being lifted up when the second cantilever 32 is pressed against by the conductor 11 in the assembled state.

[0072] In some embodiments, the base 33 further includes an operating portion 333, which extends from the end of the base and provides a location for operating the grounding spring. Based on the above embodiment, the operating portion 333 further includes an arch 3331. After the grounding spring 30 is assembled, the operating portion 333 is interference-fitted with the wind shield bottom shell 20 by means of the arch 3331 to further fix the grounding spring 30.

[0073] During the installation process, the operating part 333 on the grounding spring 30 is held, so that the second groove 332 on the base 33 is gently inserted into the engaging structure 23. When the grounding spring 30 and the wind shield bottom shell 20 are fixed, the bent and upturned bent part 319 of the first cantilever 31 passes through the through hole 24 on the wind shield bottom shell 20 and just contacts the metal plate 51; the second cantilever 32 sinking downward abuts against the conductor 11 on the balance body 10, so that the entire wind shield system 10 and the balance shell 20 are connected together, achieving the effect of eliminating static electricity inside the wind shield.

[0074] After the grounding spring clip is assembled, the base 33 absorbs forces acting in opposite directions on the first cantilever 31 and the second cantilever 32. In addition, when the arch 3331 is interference fit with the wind shield bottom shell 20, the wind shield bottom shell 20 generates a downward force on the grounding spring clip 30 as a whole, and the locking structure 23 locks the grounding spring clip 30 to apply an upward force. Multiple forces cause the base 33 to deform moderately to balance the forces on the spring clip.

[0075] It should be noted that after the base 33 is inserted into the snap-fit ​​structure 23, a certain amount of space can be provided, and then during disassembly, the grounding spring piece 30 can be lifted to one side by holding the operating portion 333, so that the positioning hole 331 and the protruding structure 22 can be separated from each other, and then the grounding spring piece 30 can be pulled out to complete the disassembly process of the grounding spring piece 30. Through the arrangement of the positioning hole 331, the protruding structure 22, the snap-fit ​​structure 23 and the second groove 332, the grounding spring piece 30 and the fan cover bottom shell 20 can be positioned and fixed in three dimensions, so as to be safely and reliably connected together, and easy to disassemble.

[0076] The above-mentioned balance wind shield grounding structure fixes the balance wind shield grounding spring piece through the snap-fit ​​structure and the connection form of the positioning hole and the protrusion structure. The static electricity on the wind shield shell of the electronic balance is effectively eliminated through the contact between the first cantilever and the second cantilever and the metal plate and the conductor. Compared with the traditional hot melt process, the overall mechanical structure is simple, which simplifies the assembly process and is less prone to errors, solving the problems of high cost and uncontrollable quality brought about by the existing hot melt process.

[0077] Combined with the introduction of the balance wind shield grounding structure, an electronic balance can also be understood. The electronic balance uses the balance wind shield grounding structure to achieve the connection between the metal plate and the balance body, effectively eliminating the static electricity on the wind shield structure.

[0078] It should be noted that the above content uses words such as "first" and "second" to limit components, which is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0079] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0080] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A balance wind shield grounding structure, comprising a balance body (10), a wind shield bottom shell (20) and a grounding spring piece (30), wherein a metal plate (51) is provided on the wind shield bottom shell (20), and the grounding spring piece (30) is used to conduct the metal plate (51) and the balance body (10), characterized in that: The wind shield bottom shell (20) comprises a clamping portion (21) and a through hole (24); the balance body (10) comprises a conductor (11); the grounding spring sheet (30) comprises a base (33), a first cantilever (31) and a second cantilever (32); a portion of the first cantilever (31) passes through the through hole to contact the metal plate (51); the second cantilever (32) is used to abut against the conductor (11); the clamping portion (21) is used to clamp and fix the grounding spring sheet (30).

2. The balance wind shield grounding structure according to claim 1, characterized in that: The clamping portion (21) comprises a protruding structure (22) and a clamping structure (23); the base (33) comprises a positioning hole (331); the positioning hole (331) is used to cooperate with the protruding structure (22); the clamping structure (23) is used to clamp at least a portion of the base (33) to jointly limit the grounding spring sheet (30).

3. The balance wind shield grounding structure according to claim 2, characterized in that: The wind shield bottom shell (20) is provided with a protruding extension wall (25), and the extension wall (25) is provided with a snap-fit ​​groove (251). The snap-fit ​​groove (251) forms at least a part of the snap-fit ​​structure (23) to vertically limit the grounding spring sheet (30).

4. The balance wind shield grounding structure according to claim 3, characterized in that: The wind shield bottom shell (20) is provided with a first groove (27) which faces the engaging groove (251) and together forms the engaging structure (23).

5. The balance wind shield grounding structure according to claim 3, characterized in that: At least a portion of the base (33) is recessed in a lateral direction perpendicular to the plane where the base is located, forming a second groove (332) for inserting into the engaging groove (251).

6. The balance wind shield grounding structure according to claim 3, characterized in that: The extension wall (25) is also provided with a limiting portion (253) for horizontally limiting the grounding spring sheet (30).

7. The balance wind shield grounding structure according to claim 6, characterized in that: The limiting portion (253) is a limiting wall (255) or a limiting cavity (252) surrounded by the extending wall (25).

8. The balance wind shield grounding structure according to claim 1, characterized in that: The first cantilever (31) comprises a bent portion (319) arranged in the middle or at an end portion, and the bent portion (319) is used to pass through the through hole (24).

9. The balance wind shield grounding structure according to claim 1, characterized in that: The base (33) further comprises an operating portion (333), wherein the operating portion (333) extends from an end portion of the base.

10. The balance wind shield grounding structure according to claim 9, characterized in that: The operating portion (333) further comprises an arch (3331), and after the grounding spring sheet (30) is assembled, the operating portion (333) is interference-fitted with the wind shield bottom shell (20) by means of the arch (3331).

11. An electronic balance, comprising a wind shield structure (50), a balance body (10) and a weighing assembly (40), wherein the wind shield structure (50) comprises a wind shield bottom shell (20) and a metal plate (51), characterized in that: The metal plate (51) and the balance body (10) are connected by using the balance wind shield grounding structure as described in any one of claims 1 to 10.

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