CN217236963U

CN217236963U - Electronic scale

Info

Publication number: CN217236963U
Application number: CN202121945234.5U
Authority: CN
Inventors: 曾开元; 唐伟
Original assignee: Chengdu Forward Technology Co ltd
Current assignee: Chengdu Forward Technology Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-08-19
Anticipated expiration: 2031-08-18

Abstract

The utility model relates to an electronic scale, which comprises a bearing plate; a plurality of weighing measurement components which are arranged and fixed on one side surface of the bearing plate; a lower housing; a scale pan fixed with the lower shell; the lower shell and the weighing pan are mutually installed and fixed to form an accommodating cavity with two open ends; an assembly body formed by the bearing plate and the weighing and measuring assembly after the assembly is finished is fixedly arranged in the accommodating cavity; one end of the accommodating cavity is fixedly provided with the front shell assembly through a connecting fixing piece, and the other end of the accommodating cavity is fixedly provided with a rear shell; and the front shell assembly is fixedly provided with an operation display assembly, and the weighing measurement assembly is electrically connected with the operation display assembly through a lead.

Description

Electronic scale

Technical Field

The utility model relates to a weighing apparatus in the measuring instrument technology, concretely relates to electronic scale.

Background

An electronic scale is a weighing apparatus, and is a tool for measuring the mass to be measured by utilizing Hooke's law or the lever balance principle of force. The electronic scale is mainly composed of a bearing system (such as a scale pan and a scale body), a force transmission conversion system (such as a lever force transmission system and a sensor) and a value indicating system (such as a dial and an electronic display instrument), and is generally divided into a fat scale, a human body scale, a kitchen scale, a postal scale and the like. The utility model is popular because of its small volume, low price, strong practicability and convenient use. With the popularization of electronic scales, more and more electronic scales are applied to various industries and various commodity transactions.

In view of the inconvenient realistic problem of electronic scale equipment, the utility model provides a can realize the electronic scale of modularization equipment and conveniently carry.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the defect that above-mentioned background art exists, provide an electronic scale that can realize the modularization equipment and conveniently carry.

In order to achieve the purpose, the electronic scale of the utility model comprises a bearing plate; a plurality of weighing measurement components which are arranged and fixed on one side surface of the bearing plate; a lower housing; a scale pan fixed with the lower shell; the lower shell and the weighing pan are mutually installed and fixed to form an accommodating cavity with two open ends; an assembly body formed by the bearing plate and the weighing and measuring assembly after the assembly is finished is fixedly arranged in the accommodating cavity; one end of the accommodating cavity is fixedly provided with the front shell assembly through a connecting fixing piece, and the other end of the accommodating cavity is fixedly provided with a rear shell; and the front shell assembly is fixedly provided with an operation display assembly, and the weighing measurement assembly is electrically connected with the operation display assembly through a lead.

Further, the connecting fixture includes a base; an assembling support part formed by annularly projecting four side edges of one side surface of the base part; a plurality of two rows of buckle mounting holes which are arranged in parallel and are arranged at the opposite two side edges of the other side surface of the base part, and an assembly block is formed between every two buckle mounting holes in a protruding way; a positioning block formed by a side edge of the base in a protruding way; a first mounting step is formed between the assembling block and the base part, and the first mounting step is provided with a first supporting surface positioned on the assembling block and a first abutting surface positioned on the base part; a second mounting step is formed between the base part and the assembling and supporting part, and the second mounting step consists of a second supporting surface positioned on the assembling and supporting part and a second abutting surface positioned on the base part; the base is provided with at least two fixing columns, and the fixing columns and the assembling supporting portion are located on the same side face of the base.

The front shell assembly further comprises a first front shell and a second front shell which is matched with the first front shell and fixedly mounted with the first front shell; and the first front shell and the second front shell are installed and fixed through any one or combination of at least two modes of buckle fastening, mechanical fastening, fastening middleware and gluing and fixing.

Further, the first front case has a first case body further including a first front side edge, a first rear side edge, a first left side edge and a first right side edge; the first front side edge, the first rear side edge, the first left side edge and the first right side edge respectively protrude to form a first front side shell, a first rear side shell, a first left side shell and a first right side shell, and the first front side shell, the first rear side shell, the first left side shell, the first right side shell and the first shell body enclose to form a first fixing space.

Furthermore, two adjacent side edges of the first rear shell protrude to form a first assembling plate; and a plurality of first buckles formed by protruding one side surface of the first rear side shell.

Further, the following steps: the second shell body further comprises a second front side edge, a second rear side edge, a second left side edge and a second right side edge; the second front side edge, the second rear side edge, the second left side edge and the second right side edge respectively protrude to form a second front side shell, a second rear side shell, a second left side shell and a second right side shell, and the second front side shell, the second rear side shell, the second left side shell, the second right side shell and the second shell body enclose to form a second fixing space.

Furthermore, two adjacent side edges on the second rear side shell protrude to form a second assembly plate; and a plurality of second buckles formed by protruding one side surface of the second rear side shell.

Further, utilize the connection mounting will the first procapsid of procapsid subassembly is fixed with the assembly body erection that forms after the second procapsid erection is fixed the one end of holding cavity, be formed with a locating notch after the first procapsid of procapsid subassembly is accomplished with the second procapsid assembly, the locating piece is installed in the locating notch, the assembly piece top is held first assembly plate reaches on the second assembly plate, first buckle reaches the second buckle card is held in the buckle mounting hole, the terminal edge of first assembly plate and the terminal edge of second assembly plate support and hold first support surface, first support surface top is held in the tip position department of last first assembly plate and the tip position department of second assembly plate.

Further, after the first front housing and the second front housing are mounted and fixed to each other, a fixing cavity for mounting and fixing the operation and control display assembly is formed between the first fixing space and the second fixing space.

Furthermore, each weighing and measuring component further comprises a weighing and measuring support, each weighing and measuring support further comprises a support base plate, two opposite side edges of the support base plate are convexly extended to form two fixing arms, and a fixing gap is formed between the two fixing arms.

Furthermore, the scale pan is provided with a base plate, two pairs of opposite side plates formed by bending and convexly extending opposite side edges of the base plate, two bent plates formed by convexly extending opposite side edges of the side plates and two fixing plates formed by convexly extending opposite side edges of the bent plates; assembling an assembly body formed by assembling the bearing plate and the weighing and measuring assembly together with the connecting and fixing piece by utilizing the mutual matching of a screw, the fixed gap and the fixed column; and buckling the scale on the bearing plate, and abutting the front end edge of the base plate, the front end edge of the side plate, the front end edge of the bending plate and the front end edge of the fixing plate on the second abutting surface, wherein the second supporting surface abuts against the front end of the base plate, the front end of the side plate, the front end of the bending plate and the front end of the fixing plate.

Furthermore, the rear shell further comprises a shell body, a jacking part and two fixing columns; a third mounting step is formed between the top holding part and the shell body, and the third mounting step further comprises a third supporting surface and a third abutting surface; during assembly, screws penetrate through the fixed gaps to be fixed with the fixed columns in a threaded manner, so that an assembly formed after the bearing plate and the weighing and measuring assembly are assembled and fixed with the rear shell, the rear end edge of the base plate, the rear end edge of the side plate, the rear end edge of the bending plate, the rear end edge of the fixed plate and the rear end edge of the lower shell are abutted against the third abutting surface, and the third supporting surface abuts against the rear end of the base plate, the rear end of the side plate, the rear end of the bending plate, the rear end of the fixed plate and the rear end of the lower shell.

Further, the second front case further includes a battery cover detachably covering the second case body.

To sum up, the utility model provides a pair of electronic scale constitutes with the form of subassembly through each component of electronic scale, is about to divide into the component of a plurality of differences such as weighing measurement subassembly, procapsid subassembly, bearing plate, back casing with the electronic scale, is carrying out the equipment of electronic scale after accomplishing the equipment of each subassembly, makes the electronic scale equipment more convenient, simultaneously, the utility model provides a pair of electronic scale is provided with the handle on the electronic scale, makes it have the characteristics that conveniently carry

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of an electronic scale according to the present invention.

Fig. 2 is an exploded schematic view of an electronic scale according to the present invention.

Fig. 3 is a schematic diagram of a three-dimensional structure of a first front case in a front case assembly of an electronic scale according to the present invention.

Fig. 4 is a schematic perspective view of another perspective view of the second front case in the front case assembly of the electronic scale according to the present invention.

Fig. 5 is a schematic perspective view of a pan of an electronic scale according to the present invention.

Fig. 6 is a schematic view of a three-dimensional structure of a weighing and measuring stand of the electronic scale of the present invention.

Fig. 7 is a schematic perspective view of a connection fixing member of an electronic scale according to the present invention.

Fig. 8 is an enlarged view of fig. 7 illustrating a connection fixing member a of an electronic scale according to the present invention.

Fig. 9 is a schematic perspective view of another view angle of the connection fixing member of the electronic scale according to the present invention.

Fig. 10 is an enlarged view of a connection fixing member B of the electronic scale of the present invention shown in fig. 9.

Fig. 11 is a schematic perspective view of a rear housing of a front housing assembly of an electronic scale according to the present invention.

Fig. 12 is an enlarged schematic view of a rear case C of the electronic scale of the present invention shown in fig. 11.

Fig. 13 is a schematic perspective view of another perspective view of a rear housing in a front housing assembly of an electronic scale according to the present invention.

Detailed Description

In order to explain the technical content, structural features, and achieved objects and effects of the present invention in detail, the following embodiments are described in detail with reference to the accompanying drawings.

Unless otherwise defined, all technical and scientific terms used in the examples of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it should also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

Meanwhile, it should be noted that the terms "first", "second", and the like used in the embodiments of the present application to indicate the order are only used for distinguishing different components and should not be construed as limiting the embodiments of the present application.

Referring to fig. 1 and 2, an electronic scale 100 of the present invention includes a lower case 1; a scale pan 2 fixed with the lower shell 1; the lower shell 1 and the scale pan 2 are mutually installed and fixed to form an accommodating cavity (not marked in the figure) with two open ends; a bearing plate 3 and a plurality of weighing and measuring components 4 which are fixedly arranged on one side surface of the bearing plate 3 are fixedly arranged in the accommodating cavity; one end of the accommodating cavity is fixedly provided with a front shell assembly 5 through a connecting fixing piece, and the other end of the accommodating cavity is fixedly provided with a rear shell 6; an operation display component (not shown) is fixedly mounted on the front housing component 5, and the weighing and measuring component 4 is electrically connected with the operation display component through a lead.

Referring to fig. 1 and fig. 2, the bearing plate 3 is fixed between the weighing pan 2 and the weighing measuring assembly 4; the weighing and measuring component 4 is fixedly arranged between the bearing plate 3 and the lower shell 1.

Referring to fig. 1 and 2, a manipulation display device (not shown) is mounted and fixed on one side of the front housing device 5, and a handle (not shown) is disposed on the other side of the front housing device.

Referring to fig. 5, the pan 2 has a square base plate 21, two opposite side plates 22 formed by bending and protruding opposite side edges of the base plate 21 perpendicularly to the base plate 21, two bending plates 23 formed by protruding opposite side edges of the side plates 22 and parallel to the base plate 21, and two fixing plates 24 formed by protruding opposite side edges of the bending plates and parallel to the base plate 21. The fixing plate 24 is provided with a plurality of through holes (not shown).

Referring to fig. 6, each of the weighing measuring assemblies 4 further includes a weighing measuring bracket 41, a load cell (not shown) mounted on the weighing measuring bracket 41, a support pad (not shown) attached to the load cell, and a non-slip pad (not shown) attached to the support pad. The weighing and measuring rack 41 further includes a square rack base 411, two opposite lateral edges of the rack base 411 are both protruded to form two L-shaped fixing arms 412 perpendicular to the rack base 411, and a fixing gap 413 is formed between the two fixing arms 412.

Referring to fig. 11 to 13, the rear housing 6 further includes a square housing body 61, a supporting portion 62 formed by protruding along the circumference of the four sides of the housing body 61, and two fixing posts 63 integrally formed on a bottom surface of the housing body 61. A third mounting step 63 is formed between the supporting portion 62 and the housing body 61, and the third mounting step 63 further includes a third supporting surface 631 and a third supporting surface 632 perpendicular to the third supporting surface 631. During assembly, the screws and the fixing gaps 413 are fixed to the fixing columns 63 in a threaded manner, so that an assembly formed by assembling the bearing plate 3 and the weighing and measuring assembly 4 is assembled and fixed with the rear shell 6.

Referring to fig. 2 and 3, the first front case 51 has a first case body 511 with a square shape, and the first case body 511 further includes a first front side edge (not shown), a first rear side edge (not shown), a first left side edge (not shown) and a first right side edge (not shown); a first front side shell 512, a first rear side shell 513, a first left side shell 514 and a first right side shell 515 are formed by the first front side edge, the first rear side edge, the first left side edge and the first right side edge in a protruding way respectively; the first front shell 512, the first rear shell 513, the first left shell 514, the first right shell 515 and the first shell 511 enclose a first fixing space (not shown); two adjacent side edges of the first rear side shell 513 protrude to form a first assembling plate 516 in an L shape; a plurality of first buckles 517 which are formed by protruding one side surface of the first rear side housing 513 and are evenly distributed. The first front housing 51 is further provided with a plurality of key holes (not shown), a display window (not shown) and an integrally formed handle opening (not shown).

Referring to fig. 2 and 3, the second front case 52 further includes a second case body 521 having a square shape and a battery cover (not shown) detachably covering the second case body. The second shell body 521 further comprises a second front side edge (not shown), a second rear side edge (not shown), a second left side edge (not shown) and a second right side edge (not shown); a second front shell 522, a second rear shell 523, a second left shell 524 and a second right shell 525 respectively protrude from the second front edge, the second rear edge, the second left edge and the second right edge, and a second fixing space (not shown) is defined by the second front shell 522, the second rear shell 523, the second left shell 524, the second right shell 525 and the second shell body 521; two adjacent side edges of the second rear side housing 523 protrude to form an L-shaped second assembling plate 526; a plurality of second latches 527 are formed by protruding one side of the second rear side housing 523 and are uniformly distributed. A battery receiving groove (not shown) is integrally formed on the second case body 521, and the battery cover is detachably covered at the opening of the battery receiving groove (not shown).

Referring to fig. 7 to 10, an electronic scale 100 of the present invention further includes a connecting and fixing member 7 fixed at the opening of the front end of the accommodating cavity; the connecting fixture 7 further comprises a base 71 having a square shape; a fitting support portion 72 formed by annularly projecting the four side edges of one side surface of the base portion 71 perpendicularly to the base portion 71; a plurality of two rows of buckle mounting holes 711 arranged in parallel at two opposite side edges of the other side surface of the base 71, and an assembling block 712 is convexly formed between every two buckle mounting holes 711; a positioning block 713 formed by a side edge of the base 71 protruding; a first mounting step 73 is formed between the mounting block 712 and the base portion 71, and the first mounting step 73 is composed of a first supporting surface 731 on the mounting block 712 and a first abutting surface 732 perpendicular to the first supporting surface 731 on the base portion 71; a second mounting step 74 is formed between the base portion 71 and the mounting support portion 72, and the second mounting step 74 includes a second annular support surface 741 located on the mounting support portion 72 and a second abutting surface 742 located on the base portion 71 and perpendicular to the second support surface 741. At least two fixing posts 714 are integrally formed on one side surface of the base 71, and the fixing posts 714 and the assembling support 72 are located on the same side surface of the base.

In other preferred embodiments, the first front housing 51 and the second front housing 52 may be fixed by any one or a combination of at least two of snap fastening, mechanical fastening, fastening intermediate member, and gluing.

Referring to fig. 1 to 13, when assembling the electronic scale 100, the weighing and measuring assembly 4 is fixed on the bearing plate 3 by gluing; assembling the assembly formed by assembling the bearing plate 3 and the weighing and measuring assembly 4 with the connecting and fixing member 7 by the mutual matching of the screws, the fixing gap 413 and the fixing column 714; the scale 2 is fastened to the bearing plate 3, and the front end edge of the base plate 21 and the front end edge of the side plate 22 are abutted against the second abutting surface 741, and the second support surface 742 abuts against the front end of the base plate 21 and the front end of the side plate 22; the assembly formed by the first front housing 51 and the second front housing 52 being fixed and mounted by the connecting and fixing member 7 is fixed and mounted at the front opening of the accommodating cavity, a positioning notch (not shown) is formed after the first front housing 51 and the second front housing 52 are assembled, the positioning block 713 is mounted in the positioning notch, the mounting block 712 abuts against the first mounting plate 516 and the second mounting plate 526, the first buckle 517 and the second buckle 527 are clamped in the buckle mounting hole 711, the end edge of the first mounting plate 516 and the end edge of the second mounting plate 526 both abut against the first abutting surface 732, and the first supporting surface 731 of the first mounting step 73 abuts against the rear ends of the first mounting plate 516 and the second mounting plate 526; the rear end edge of the substrate 21 and the rear end edge of the side plate 22 both abut against the third abutting surface 632, and the third supporting surface 631 abuts against the rear end of the substrate 21 and the rear end of the side plate 22; the scale pan 2 and the lower shell 1 are fixed on the weighing and measuring assembly 4 by screws, the front end edge of the lower shell 1, the front end edge of the bending plate 23 and the front end edge of the fixing plate are all abutted against the second abutting surface 742, the rear shell 6 is fixed at the opening at the rear end of the accommodating cavity by screws, the fixing gap 413 and the fixing column 714, the rear end edge of the substrate 21, the rear end edge of the side plate 22, the rear end edge of the bending plate 23, the rear end edge of the fixing plate 24 and the rear end edge of the lower shell are abutted against the third abutting surface 632, and the third supporting surface 632 is abutted against the rear end of the substrate 21, the rear end of the side plate 22, the rear end of the bending plate 23, the rear end of the fixing plate 24 and the rear end of the lower shell 1

It should be understood that the present invention is illustrated in one embodiment, and other suitable mounting sequences can be used for mounting in other preferred embodiments, and it should be understood that the illustrated assembly sequence is not intended to limit the invention to other suitable mounting sequences not provided by the present invention.

To sum up, the utility model provides a pair of electronic scale 100 constitutes with the form of subassembly through each component of electronic scale, is about to the electronic scale and divide into the component of a plurality of differences such as measuring unit, procapsid subassembly, bearing plate, back casing of weighing, is carrying out the equipment of electronic scale after accomplishing the equipment of each subassembly, and it is more convenient to make the electronic scale equipment, simultaneously, the utility model provides a pair of electronic scale 100 is provided with the handle on the electronic scale, makes it have the characteristics of conveniently carrying.

As described above, the present invention is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an electronic scale, its is fixed including a bearing plate and a plurality of installation the measuring component that weighs on a bearing plate side, its characterized in that:

the electronic scale further comprises a lower shell;

the lower shell and the scale plate are mutually installed and fixed to form an accommodating cavity with two open ends;

an assembly body formed by the bearing plate and the weighing and measuring assembly after the assembly is finished is fixedly arranged in the accommodating cavity;

one end of the opening of the accommodating cavity is fixedly provided with a front shell assembly through a connecting fixing piece, and the other end of the opening is fixedly provided with a rear shell;

and the front shell assembly is fixedly provided with an operation display assembly.

2. An electronic scale according to claim 1, characterized in that: the connecting fixture comprises a base; a fitting support portion formed by annularly projecting four side edges of one side surface of the base portion; a plurality of two rows of buckle mounting holes which are arranged in parallel and are arranged at the two opposite side edges of the other side surface of the base part, and an assembly block is formed by protruding extension between every two buckle mounting holes; a positioning block formed by a side edge of the base in a protruding way; a first mounting step is formed between the assembling block and the base part, and the first mounting step is provided with a first supporting surface positioned on the assembling block and a first abutting surface positioned on the base part; a second mounting step is formed between the base part and the assembling support part, and the second mounting step is composed of a second support surface positioned on the assembling support part and a second abutting surface positioned on the base part; at least two fixing columns are arranged on the base, and the fixing columns and the assembling supporting portion are located on the same side face of the base.

3. An electronic scale according to claim 2, characterized in that: the front shell assembly further comprises a first front shell and a second front shell which is matched with the first front shell and fixedly installed; and the first front shell and the second front shell are installed and fixed through any one or combination of at least two modes of buckle fastening, mechanical fastening, fastening middleware and gluing and fixing.

4. An electronic scale according to claim 3, characterized in that: the first front shell has a first shell body, which further includes a first front side edge, a first rear side edge, a first left side edge and a first right side edge; the first front side edge, the first rear side edge, the first left side edge and the first right side edge respectively protrude to form a first front side shell, a first rear side shell, a first left side shell and a first right side shell, and the first front side shell, the first rear side shell, the first left side shell, the first right side shell and the first shell body enclose to form a first fixing space.

5. An electronic scale according to claim 4, wherein: two adjacent side edges on the first rear side shell protrude to form a first assembling plate; and a plurality of first buckles formed by protruding one side surface of the first rear side shell.

6. An electronic scale according to claim 5, characterized in that: the second front shell has a second shell body, which further includes a second front side edge, a second rear side edge, a second left side edge and a second right side edge; the second front side edge, the second rear side edge, the second left side edge and the second right side edge are respectively formed with a second front side shell, a second rear side shell, a second left side shell and a second right side shell in a protruding manner, and the second front side shell, the second rear side shell, the second left side shell, the second right side shell and the second shell body enclose to form a second fixed space.

7. An electronic scale according to claim 6, wherein: two adjacent side edges on the second rear side shell protrude to form a second assembling plate; and a plurality of second buckles formed by protruding one side surface of the second rear side shell.

8. An electronic scale according to claim 7, characterized in that: the connecting and fixing part is used for installing and fixing an assembly body formed after the first front shell and the second front shell of the front shell assembly are installed and fixed at one end of the accommodating cavity, a positioning notch is formed after the first front shell and the second front shell of the front shell assembly are assembled, the positioning block is installed in the positioning notch, the assembly block is supported against the first assembly plate and the second assembly plate, the first buckle and the second buckle are clamped in the buckle installation hole, the end edge of the first assembly plate and the end edge of the second assembly plate support against the first supporting surface, and the first supporting surface supports against the end position of the first assembly plate and the end position of the second assembly plate.

9. An electronic scale according to claim 6 or 7, wherein: after the first front shell and the second front shell are installed and fixed with each other, a fixing cavity for installing and fixing the control display component is formed by the first fixing space and the second fixing space together.

10. An electronic scale according to claim 2, characterized in that: each the weighing and measuring assembly further comprises a weighing and measuring support, each weighing and measuring support further comprises a support base plate, two opposite lateral edges of the support base plate are convexly extended to form two fixing arms, and a fixing gap is formed between the two fixing arms.

11. An electronic scale according to claim 10, characterized in that: the scale pan is provided with a substrate, two side plates which are opposite to each other and formed by bending and convexly stretching the opposite side edges of the substrate, two bending plates which are formed by convexly stretching the opposite side edges of the side plates and two fixing plates which are formed by convexly stretching the opposite side edges of the bending plates; assembling an assembly formed by assembling the bearing plate and the weighing and measuring assembly together with the connecting and fixing piece by utilizing the mutual matching of the screw, the fixing gap and the fixing column; the scale plate is buckled on the bearing plate, the front end edge of the base plate, the front end edge of the side plate, the front end edge of the bending plate and the front end edge of the fixing plate are abutted against the second abutting surface, and the second supporting surface abuts against the front end of the base plate, the front end of the side plate, the front end of the bending plate and the front end of the fixing plate.

12. An electronic scale according to claim 11, wherein: the rear shell further comprises a shell body, a jacking part and two fixing columns; a third mounting step is formed between the top supporting part and the shell body, and the third mounting step further comprises a third supporting surface and a third abutting surface; during assembly, screws penetrate through the fixed gaps to be fixed with the fixed columns in a threaded connection mode, so that an assembly formed after the bearing plate and the weighing and measuring assembly are assembled and fixed with the rear shell, the rear end edge of the base plate, the rear end edge of the side plate, the rear end edge of the bending plate, the rear end edge of the fixed plate and the rear end edge of the lower shell are abutted and held on the third abutting surface, and the third supporting surface abuts against the rear end of the base plate, the rear end of the side plate, the rear end of the bending plate, the rear end of the fixed plate and the rear end of the lower shell.