Double-lever weighing sensor and electronic balance

Abstract

The invention relates to a double-lever weighing sensor and an electronic balance, the double-lever weighing sensor comprises a base, a bearing support, a parallel conductor, a lever member and a magnetic steel set, the base comprises a mounting platform and walls arranged on two sides of the mounting platform, and the base is provided with a top lower accommodating cavity and a top accommodating cavity in sequence above the mounting platform. The base is sequentially provided with a bottom containing cavity, a bottom upper containing cavity and a bottom lower containing cavity below the installation platform, the two ends of the base are each provided with an end containing cavity, the parallel conductor comprises a top conductor and a bottom conductor, and the lever piece comprises a first-level lever and a second-level lever. According to the technical scheme, the size, especially the span in the length direction, can be effectively reduced, and the internal space of the base can be effectively utilized.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electronic balance, in particular to a double-lever weighing sensor and an electronic balance. BACKGROUND

[0002] The weighing sensor (electromagnetic force sensor) is the core measurement unit of the electronic balance, which converts mechanical force into electrical signal, and displays the result after amplification, filtering and analog-digital conversion, thereby realizing accurate weighing of the electronic balance.

[0003] At present, the commonly used weighing sensor on the electronic balance has different structures and range requirements according to different use conditions. The weighing sensor uses the principle of lever to balance a larger load force with a small electromagnetic force. For some simple structure and low range weighing sensor, the structure of single-stage lever can meet the weighing requirements. However, for large range and small volume weighing sensor, the structure of single-stage lever (single lever) often cannot meet the requirements, and it is necessary to use the form of two-stage lever (double lever) to obtain a large lever ratio.

[0004] The existing weighing sensor with two-stage lever structure generally includes a bearing frame, a base, a lever piece, a conducting piece and a magnetic steel sleeve set, etc. After assembly of each component, the overall volume is difficult to be small enough, especially the length direction span is relatively long and it is difficult to shorten.

[0005] For example, the weighing sensor with publication number CN113124968A pursues the assembly process of each component to be simplified, and the conducting piece, the bearing frame, the base, the first lever and the second lever are constructed into an integral long die-casting structure, and each component is basically in a special shape, which is not regular enough, and the difficulty of integral molding is increased. Therefore, in order to realize integral molding, the first lever and the second lever are forced to be designed to be connected in sequence along the length direction of the long rectangular die-casting structure. The first lever and the second lever themselves need to have a certain length, which makes the span of the integral structure in the length direction relatively long. In addition, the base also needs to be able to accommodate the first lever and the second lever, and the first lever and the second lever need to have a certain height difference after being connected. Therefore, the height of the base in the vertical direction is forced to increase, and the internal space of the base is basically occupied by the first lever and the second lever. In addition, the die-casting structure is further lengthened in the length direction by the installation of the mounting part protruding in the length direction at the end of the die-casting structure to install the magnetic steel sleeve set.

[0006] In summary: on the one hand, the overall span of the die-casting structure in the length direction cannot be reduced, and the height of the base also cannot be reduced because the base needs to accommodate the first lever and the second lever with a height difference inside; on the other hand, the magnetic steel sleeve set, the first lever and the second lever cannot be accommodated inside the base, and the structure of the base has deficiencies, and the internal space is not fully utilized. SUMMARY

[0007] The present disclosure aims to at least solve one of the technical problems existing in the prior art or related art.

[0008] To this end, a double-lever weighing sensor is provided in a first aspect of the present disclosure, comprising a base, a bearing support, parallel conductors, a lever member and a magnet steel sleeve set;

[0009] The bearing support is vertically arranged on the outer side of the front end of the base;

[0010] The base comprises a mounting platform and walls arranged on both sides of the mounting platform,

[0011] The top of the mounting platform and the walls on both sides form a top-down accommodating cavity, at least part of the top of the walls is recessed downward to form a top-up accommodating cavity above the top-down accommodating cavity, the bottom of the mounting platform and the walls on both sides form a bottom accommodating cavity, the bottom of the mounting platform is protruded downward at the rear end to form a bottom-up accommodating cavity through the bottom accommodating cavity together with the walls on both sides, at least part of the bottom of the walls is recessed upward to form a bottom-down accommodating cavity through the bottom accommodating cavity, the front and rear ends of the mounting platform are recessed inward relative to the end of the wall on the same side to form a mounting end, and the mounting end and the walls on both sides which are protruded outward relative to the mounting end form an end accommodating cavity;

[0012] The parallel conductors comprise top conductors and bottom conductors for connecting the bearing support and the walls, the top conductors and the bottom conductors are respectively accommodated in the top-up accommodating cavity and the bottom-down accommodating cavity and are arranged symmetrically upward and downward;

[0013] The magnet steel sleeve set is installed upside down in the bottom accommodating cavity;

[0014] The lever member comprises a first lever accommodated in the top-down accommodating cavity and a second lever accommodated in the bottom-up accommodating cavity, the first front end of the first lever is connected to the bearing support and the mounting end in front, the first rear end of the first lever is connected to the second rear end of the second lever in upward and downward alignment, and the second front end of the second lever passes through the magnet steel sleeve set and is located in the photoelectric detection slot at the front end of the base.

[0015] In a feasible implementation, the bearing support is configured as a plate-shaped structure with a first top connecting wall with the same height as the top surface of the top conductor and a first bottom connecting wall with the same height as the bottom surface of the bottom conductor, and the side wall of the plate-shaped structure is arranged in alignment with the side wall of the wall on the same side. The plate-shaped structure of the bearing support can have a certain wall thickness to meet the overall bearing strength requirement, and the overall size can be matched with the size of the base as much as possible, which contributes to the miniaturization of the weighing sensor in size, and the top connecting wall and the bottom connecting wall arranged at the same height can realize smooth and balanced transmission of force.

[0016] In an embodiment, the top surface of the unindented portion of the top of the wall forms a second top connecting wall that is level with the top surface of the top conductor, and the top surface of the unindented portion of the bottom of the wall forms a second bottom connecting wall that is level with the bottom surface of the bottom conductor, thereby maintaining a smooth and balanced transmission of force.

[0017] In an embodiment, the top of each wall is indented downward near the second top connecting wall on the same side to form a top adjustment flat wall that extends to the front end of the wall, and the bottom of each wall is indented upward near the second bottom connecting wall on the same side to form a bottom adjustment flat wall that extends to the front end of the wall, and the two top adjustment flat walls are level with each other, and the two bottom adjustment flat walls are level with each other.

[0018] Preferably, each wall is provided with an elongated adjustment hole that extends along the length of the base near the top adjustment flat wall, and each wall is provided with an adjustment slit at the rear end that corresponds to the elongated adjustment hole, and a vertical screw hole is provided in the wall at the adjustment slit, and an adjustment rod is screwed into the vertical screw hole, so that the top adjustment flat wall can be adjusted by screwing in or out of the adjustment rod, so that the two top adjustment flat walls remain relatively parallel and level with each other.

[0019] In an embodiment, the top conductor and the bottom conductor have the same shape and structure, and are configured as a frame-type plate structure, and have a first connecting front end, a first connecting rear end, and a connecting body that connects the first connecting front end and the first connecting rear end; the first connecting front end of the top conductor is connected to the first top connecting wall, and the first connecting front end of the bottom conductor is connected to the first bottom connecting wall; the first connecting rear end of the top conductor is connected to the second top connecting wall, and the first connecting rear end of the bottom conductor is connected to the second bottom connecting wall.

[0020] In an embodiment, the primary lever is configured as a frame structure, and has a first front end, a first rear end, and a connecting section that connects the first front end and the first rear end; the first front end, the first rear end, and the connecting section surround a central through hole; the first front end has a middle front end that is located in the middle and protrudes outward, and symmetrical stepped side front ends located on both sides of the middle front end, the stepped side front ends include a first side front end located inward and a second side front end located outward, the middle front end is connected to the bearing bracket, the first side front end and the second side front end are connected to the mounting end portion located in front on the mounting platform, and the middle front end and the stepped side front ends are located in the end portion located in front accommodating cavity; the first rear end has a first middle rear end located in the middle and protruding outward, and the first middle rear end is located in the end portion located in back accommodating cavity.

[0021] In an implementable embodiment, the secondary lever is configured as a T-shaped strip structure, having a second rear end, a second front end, and a main body segment connecting the second rear end and the second front end, the second rear end having a second middle rear end in the middle and outwardly convex, and side rear ends symmetrically located on both sides of the second middle rear end, the second middle rear end being connected with the first middle rear end, the side rear ends being connected with the rear installation end, the side rear ends being located in the cavity of the rear end, and the main body segment being located in the magnetic steel sleeve group.

[0022] In an implementable embodiment, the installation platform is provided with an installation hole in communication with the top cavity and the bottom cavity, and the bottom end of the magnetic steel sleeve group is fitted into the installation hole, and the remaining part of the magnetic steel sleeve group is inverted and accommodated in the bottom cavity.

[0023] In a second aspect of the present disclosure, an electronic balance is provided, comprising the double-lever weighing sensor described above.

[0024] Compared with the prior art, the present disclosure has at least the following beneficial effects:

[0025] The present disclosure forms a double-lever weighing sensor through the arrangement of the base, the bearing bracket, the parallel conductor, and the lever piece;

[0026] The base, the bearing bracket, the parallel conductor, and the lever piece of the present disclosure are of a split structure, which is easier to be processed and formed separately compared with the requirement of one-piece forming in the prior art. At this time, through the optimization and improvement design of the base structure, each cavity is formed from top to bottom in vertical height, which can realize the orderly and regular accommodation of each component, such as the parallel conductor, the lever piece, and the magnetic steel sleeve group, in it, so that the internal space of the base is fully utilized in the vertical height direction, thereby effectively reducing the length span of the load sensor as a whole, and in the height direction, each component is arranged orderly from top to bottom, and the accommodation of each component can be realized by utilizing the vertical space inside the base itself, without the need to expand the height of the base in the vertical direction, avoiding the excessive span range of the load sensor in height and length, and ensuring the miniaturization design of the weighing sensor.

[0027] The base, the bearing bracket, the top conductor, the bottom conductor, and the primary lever of the present disclosure are not of a special-shaped structure in structural arrangement, but are relatively regular, easy to be mass-produced, and conducive to regular and orderly accommodation in the base. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the illustrative embodiments. The drawings depict only exemplary embodiments and are not intended to limit the present disclosure in any way. The same reference numbers in different drawings represent the same or similar elements.

[0031] Figure 1 is a top view schematic diagram of the present disclosure;

[0032] Figure 2 is one of the partial three-dimensional structural schematic diagrams of the present disclosure;

[0033] Figure 3 is another of the partial three-dimensional structural schematic diagrams of the present disclosure;

[0034] Figure 4 is a partial exploded schematic diagram of the connection relationship between the bearing support and the primary lever of the present disclosure;

[0035] Figure 5 is a third of the partial three-dimensional structural schematic diagrams of the present disclosure;

[0036] Figure 6 is a fourth of the partial three-dimensional structural schematic diagrams of the present disclosure;

[0037] Figure 7 is a first base three-dimensional structural schematic diagram of the present disclosure;

[0038] Figure 8 is a second base three-dimensional structural schematic diagram of the present disclosure. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0040] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some of the embodiments of the present disclosure, not all the embodiments.

[0041] At present, for the double lever load cell, in order to pursue the minimalist installation, the base, the bearing support, the top conductor, the bottom conductor, the first lever and the second lever are constructed as an integral structure, and the overall die casting blank is machined to the required size and plane accuracy. Due to the shape, structure and layout of the parts, plus the need for one-piece molding, all parts cannot be constructed in the internal space of the base, resulting in that the internal space of the base cannot be fully utilized, and some parts need to be set outside the base, so that the overall length and vertical height cannot be effectively reduced, resulting in that the load cell, especially the length direction, has a longer span.

[0042] Based on this, the double lever load cell is provided, the base, the bearing support, the parallel conductor and the lever piece are a split structure, and each can be separately machined and formed. The base can be separately optimized and improved. The installation platform and the overall arrangement of the two side walls are constructed to form each accommodating chamber above the installation platform and each accommodating chamber below the installation platform, so that each component, such as the parallel conductor and the lever piece, can be formed in the upper and lower zones and sequentially accommodated in the respective accommodating chambers, thereby maximizing the utilization of the internal space of the base itself, effectively reducing the span of the load cell in length and height, providing sufficient protection for the miniaturization design of the load cell, and also designing the required double lever load cell.

[0043] The double lever load cell will be described in detail through specific embodiments as follows:

[0044] Referring to Figures 1 to 8 , a double lever load cell is provided in the first aspect of the present disclosure, which comprises a base 10, a bearing support 20, a parallel conductor, a lever piece and a magnet steel sleeve set 30. The bearing support 20 is used to bear the weight, and is vertically arranged on the front end outside of the base 10 (for reference Figure 1 , the bearing support 20 can be understood as the front), which is an integral structure. The base 10 is also an integral structure, which comprises an installation platform 101 and walls 102 arranged on both sides of the installation platform 101. At this time, the installation platform 101 is located between the two walls 102 and at the middle and upper position, that is, the span of the space below the installation platform 101 in the vertical direction is much larger than that of the space above in the vertical direction.

[0045] In the present disclosure, the base 10 is deeply optimized and improved, and the purpose is to accommodate each component, such as the parallel conductor, the lever piece and the magnet steel sleeve set 30, to form sequential accommodation in the upper and lower positions, and to maximize the utilization of the internal space of the base 10 itself.

[0046] Specifically, the top and two sides of the mounting platform 101 are provided with the wall body 102 to form a top cavity 103 arranged horizontally; the wall body 102 is at least partially recessed at the top to form a top cavity 104 arranged horizontally above the top cavity 103; the bottom and two sides of the mounting platform 101 are provided with the wall body 102 to form a bottom cavity 105 arranged vertically downward; the bottom of the mounting platform 101 is downwardly protruded at the rear end to form an extended mounting wall 1011 together with the wall body 102 to form a bottom cavity 106 arranged horizontally through the bottom cavity 105; the wall body 102 is at least partially recessed at the bottom to form a bottom cavity 107 arranged horizontally through the bottom cavity 105; the front and rear ends of the mounting platform 101 are inwardly recessed at the end of the wall body 102 to form a mounting end 108, and the mounting end 108 is arranged vertically together with the wall body 102 outwardly protruding from the mounting end 108 to form an end cavity 109. It can be seen that the base 10 is provided with cavities required by each component above and below the mounting platform 101, so that each component can be sequentially arranged in the corresponding cavity. At the same time, the base 10 is also provided with vertical cavities at the front and rear ends, which can avoid the structure protruding outwardly arranged on the mounting end 108 to form a concealed design, so that the volume of the weighing sensor can be miniaturized under the overall design and structure of the base 10, and more importantly, the basic internal space can be used to the extreme, which is particularly prominent in compact structure.

[0047] After the cavities are arranged, in order to realize the arrangement of each component, specifically, the parallel conductors in the disclosure include a top conductor 40 and a bottom conductor 50 for connecting the bearing bracket 20 and the wall body 102, and the top conductor 40 and the bottom conductor 50 are arranged symmetrically upward and downward and arranged horizontally in the top cavity 104 and the bottom cavity 107 respectively, so that the top conductor 40 and the bottom conductor 50 do not protrude outwardly after being arranged.

[0048] The magnetic steel sleeve set 30 is arranged in the bottom cavity 105 in an inverted manner, and the mounting platform 101 is located between the two wall bodies 102 and at the middle and upper position, so that the bottom cavity 105 has a large arrangement space and can satisfy the arrangement of the magnetic steel sleeve set 30 in an inverted state, and the magnetic steel sleeve set 30 does not protrude outwardly after being arranged.

[0049] The lever member includes a first lever 60 arranged in the top-down accommodating cavity 104 and a second lever 70 arranged in the bottom-up accommodating cavity 106. The first front end of the first lever 60 is connected to the bearing support 20 and the front mounting end 108. The first rear end of the first lever 60 is connected to the second rear end of the second lever 70. The second front end of the second lever 70 passes through the lower part of the inverted magnetic steel sleeve group 30 and is located in the photoelectric detection slot 80 at the front end of the base 10. In the present disclosure, the first lever 60 and the second lever 70 are arranged in the base 10 and have respective accommodating cavities. After being arranged in the base 10, one is arranged above the mounting platform 101 and the other is arranged below the mounting platform 101. The two are arranged in an upper and lower split cavity and do not interfere with each other. After being connected and arranged, the first rear end of the first lever 60 is connected to the second rear end of the second lever 70. Thus, the two levers are arranged in an upper and lower regular manner on the base and do not cause the length of the span in the length direction to be lengthened due to staggered arrangement in the length direction.

[0050] It should be noted that in the present disclosure, the mounting platform 101 of the base 10 and the wall 102 have sufficient wall thickness. The base 10 is integrally formed and has a cuboid structure. The whole is regular and is not a special-shaped structure in the prior art. It is convenient for large-scale industrial processing and molding. More importantly, it has sufficient strength and is suitable for accommodating and assembling various components. It is also easy to construct the required accommodating cavities.

[0051] In order to realize the connection of the top conductor 40, the bottom conductor 50, the bearing support 20 and the base 10, in the present disclosure, the bearing support 20 is configured as a plate-shaped structure and has a first top connecting wall 201 which is the same height as the top surface of the top conductor 40 and a first bottom connecting wall 202 which is the same height as the bottom surface of the bottom conductor 50. It should be noted that the bearing support 20 is provided with a bearing end 203 which protrudes upward in the middle of the top. The bearing end 203 is mainly used for bearing the weight of the load. In the present disclosure, the side wall of the plate-shaped structure is arranged in alignment with the side wall of the same side of the wall 102. The bearing support 20 of the plate-shaped structure can have a certain wall thickness to meet the overall bearing strength requirement. The whole can be as large as possible to match the size of the base 10. In particular, the top and the side will not protrude out of the base. It will not raise the height of the load cell. It will not lengthen the length of the load cell. At the same time, the plate-shaped structure is easy to be industrialized and mass-produced.

[0052] The top surface of the part of the wall 102 which is not indented at the top forms a second top connecting wall 1021 which is the same height as the top surface of the top conductor 40. The top surface of the part of the wall 102 which is not indented at the bottom forms a second bottom connecting wall 1022 which is the same height as the bottom surface of the bottom conductor 50.

[0053] The top conductor 40 and the bottom conductor 50 are identical in shape and structure, are both configured as a frame-type plate structure, and have a first connection front end 451, a first connection rear end 452, and a connecting body 453 connecting the first connection front end 451 and the first connection rear end 452.

[0054] At this point, after the top conductor 40 is connected with the bearing bracket 20 and the base 10, the top surface of the top conductor 40, the first top connecting wall 201, and the second top connecting wall 1021 are all at the same height and are substantially horizontal, without any significant height difference, and the surface is flat, so that force transmission is rapid, unobstructed, and very smooth, meeting the design requirements of the weighing sensor for rapid weighing. The principle of the bottom conductor 50 connected with the bearing bracket 20 and the base 10 is similar, and will not be described in detail here.

[0055] During the connection, the first connection front end 451 of the top conductor 40 is connected with the corresponding first top connecting wall 201 through two connecting spring sheets 90 symmetrically arranged on the side, and the first connection rear end 452 of the top conductor 40 is also connected with the second top connecting wall 1021 through two connecting spring sheets 90 symmetrically arranged on the side. The connection mode of the first connection front end 451 and the first connection rear end 452 of the bottom conductor 50 with the first bottom connecting wall 202 and the second bottom connecting wall 1022 is similar to that of the top conductor 40, and will not be described in detail here.

[0056] In the present disclosure, the top of the two walls 102 is recessed downward near the same side second top connecting wall 1021 to form a top adjusting flat wall 1023 extending to the front end of the wall 102, and the bottom of the two walls 102 is recessed upward near the same side second bottom connecting wall 1022 to form a bottom adjusting flat wall 1024 extending to the front end of the wall 102, the two top adjusting flat walls 1023 are arranged at the same height, and the two bottom adjusting flat walls 1024 are arranged at the same height. In the present disclosure, the top adjusting flat wall 1023 is arranged to form a vertical gap between the top surface of the wall 102 and the top conductor 40, so as to avoid the whole top conductor 40 from being tightly attached to the top surface of the wall 102 and affecting the weighing, and the bottom adjusting flat wall 1024 can also have the same effect.

[0057] In the weighing sensor, for the two top adjusting flat walls 1023, the relative height and the relative parallelism are required, in order to realize the height adjusting, in the present disclosure, the following optimization design is carried out, the two wall bodies 102 are provided with an elongated adjusting hole 1025 arranged along the length direction of the base 10 near the top adjusting flat wall 1023, the two wall bodies 10 are provided with an adjusting gap 1026 at the rear end corresponding to the elongated adjusting hole 1025, the wall body 102 at the adjusting gap 1026 is provided with a vertical screw hole 1027, and a adjusting rod (not shown) is screwed in the vertical screw hole 1027, so that the two top adjusting flat walls 1023 can be adjusted by screwing in or out the adjusting rod, so as to realize that the two top adjusting flat walls 1023 keep relative parallel and equal height. It should be noted that the adjustment is a small adjustment, not a large size adjustment, and the wall thickness of the wall body 102 between the adjusting gap 1026 and the elongated adjusting hole 1025 is narrow, the purpose is to have a certain elasticity when adjusting, so that the top adjusting flat wall 1023 can have a small height change.

[0058] In the present disclosure, for the primary lever 60 and the secondary lever 70, the following specific style structure is adopted, the primary lever 60 is configured as a rectangular frame structure, having a first front end, a first rear end and a connecting segment connecting the first front end and the first rear end, the primary lever 60 of this structure can be arranged horizontally along the length direction of the base 10; the first front end, the first rear end and the connecting segment surround a center through hole 601, after the center through hole 601 is arranged, the occupied area of the primary lever 60 can be reduced and the primary lever 60 forms a frame structure; and the first front end has a middle front end 602 located in the middle and protruding outward, and stepped side front ends symmetrically located on both sides of the middle front end 602, the stepped side front end includes a first side front end 603 located inside and a second side front end 604 located outside, the middle front end 602 is connected with the bearing bracket 20, specifically, the bearing bracket 20 is provided with a mounting connecting block 204 on the inner end side wall, the middle front end 602 is connected with the mounting connecting block 204 through a vertically arranged connecting spring sheet 90, after mounting and connecting, the connecting spring sheet 90 and the mounting connecting block 204 are further locked with a press buckle 205 at the connecting position, so as to further firmly connect the connecting spring sheet 90 to the bearing bracket 20.

[0059] The first side front end 603 and the second side front end 604 are connected with the mounting end 108 in front of the mounting platform 101 through the vertically arranged fulcrum spring sheet 100, and the connection between the fulcrum spring sheet 100 and the mounting end 108 forms the fulcrum of the primary lever 60. It should be noted that the first side front end 603 and the second side front end 604 can be selectively used to form different primary lever fulcrums, thereby forming different ranges. Generally, one weighing sensor selects one range for use. In the present disclosure, the middle front end 602 and the stepped side front end are located in the front end accommodating cavity 109, the first rear end has the first middle rear end 605 which is located in the middle and protrudes outward, and the first middle rear end 605 is located in the rear end accommodating cavity 109. It can be seen that the vertically arranged end accommodating cavity 109 can accommodate the above-mentioned components, so as to avoid the above-mentioned components from extending out of the end of the base 10 and prolonging the length of the base 10.

[0060] In the present disclosure, the primary lever 60 is matched with the secondary lever 70. Specifically, the secondary lever 70 is arranged in the following style structure: the secondary lever 70 is configured in a T-shaped long strip structure, which is easy to form up-down micro-movement to conveniently obtain the up-down micro-movement distance. The secondary lever 70 has a second rear end, a second front end 701, and a main body segment 702 connecting the second rear end and the second front end 701. The second rear end has a second middle rear end 703 which is located in the middle and protrudes outward, and side rear ends 704 which are symmetrically located on both sides of the second middle rear end 703. The second middle rear end 703 is connected with the first middle rear end 605 through the vertically arranged connecting spring sheet 90. The side rear ends 704 are connected with the rear mounting end 108 at the extended mounting wall 1011 through the fulcrum spring sheet 100, so that the connection between the fulcrum spring sheet 100 and the extended mounting wall 1011 forms the fulcrum of the secondary lever 70. The side rear ends 704 are located in the rear end accommodating cavity 109, and the main body segment 702 is located in the lower part of the magnet steel sleeve group 30, wherein the magnet steel sleeve group 30 is provided with an avoiding space in the lower part to accommodate the main body segment 702.

[0061] The primary lever 60 and the secondary lever 70 of the above-mentioned structure are arranged vertically and located in the accommodating cavity of the base 10. During weighing, the double-lever linkage of the primary lever 60 and the secondary lever 70 is realized, and the total lever ratio of the double lever is the product of the lever ratios of the primary lever and the secondary lever. Compared with the single-lever weighing sensor, the double-lever weighing sensor of the present disclosure obtains a larger lever ratio.

[0062] In the disclosure, for the inverted installation of the magnetic steel sleeve set 30, the installation platform 101 is provided with an installation hole 1012 in communication with the top accommodating cavity 103 and the bottom accommodating cavity 105, the bottom end of the magnetic steel sleeve set 30 is fitted into the installation hole 1012, and the remaining part of the magnetic steel sleeve set 30 is inverted and accommodated in the bottom accommodating cavity 105.

[0063] It can be seen that the weighing sensor of the disclosure forms a cuboid structure after the assembly of each component, the overall structure is regular, each component is arranged in order and is compact, in particular, the base 10 is provided with a plurality of accommodating cavities capable of accommodating each component, and in addition, the accommodating cavities are arranged in order from top to bottom, each component is also arranged in order from top to bottom after being accommodated, the weighing sensor will not be lengthened in the length direction and the vertical height, thereby effectively reducing the volume, at the same time, the internal space of the base 10 is fully utilized, and the overall base 10 is regular, which is beneficial to processing and molding.

[0064] It needs to be explained that, unlike the existing thinking for a long time, the magnetic steel sleeve group 30 is set in an inverted manner, at this time the installation platform 101 is located in the upper middle position between the two side walls 102, thereby making the lower part of the installation platform 101 have enough space to contain the inverted magnetic steel sleeve group 30, and after the first lever 60 and the second lever 70 are contained and connected and assembled, the second front end 701 of the second lever 70 can pass through the lower middle part of the inverted magnetic steel sleeve group 30, thereby through the cooperation of each part, the double-lever weighing sensor required by the present disclosure can be obtained, especially the effective reduction of the length direction span. Specifically: the base 10 breaks through the conventional inherent idea of the magnetic steel sleeve group 30 being set vertically, and is unconventional, and the magnetic steel sleeve group 30 is set in an inverted manner, and the installation platform 101 is set on the base 10. The upper middle part is set, thereby leaving enough installation space in the lower part of the installation platform 101 to contain the inverted magnetic steel sleeve group 30, so that the first lever 60 and the second lever 70 can be contained in the upper and lower parts of the installation platform 101, and the main body segment 702 of the second lever 70 can be located in the lower part of the inverted magnetic steel sleeve group 30, and the second front end 701 of the second lever 70 can pass through the lower part of the magnetic steel sleeve group 30 and extend into the photoelectric detection slot 80 at the front end of the base 10. The lower part of the inverted magnetic steel sleeve group 30 is provided with a space for the main body segment 702 of the second lever 70 to be located therein, and the second rear end of the second lever 70 is aligned with the first rear end of the first lever 60 contained above the installation platform 101, and is connected by the vertically arranged connecting spring sheet 90. The upper and lower parts are aligned and connected to realize force transmission. The present disclosure is based on the above concept, so that the first lever 60 and the second lever 70 can be arranged in the upper and lower parts of the base 10, and will not be arranged in the length direction. The effective reduction of the length direction of the base 10 is realized, the magnetic steel sleeve group 30 is contained in the base 10 in an inverted manner, not only avoids the increase of the magnetic steel sleeve group 30 outside the base 10, but also effectively reduces the length of the base 10, and constructs the required double-lever weighing sensor.

[0065] When the load is loaded on the load bearing support 20, the load bearing support 20 transmits the force to the primary lever 60 through the connecting spring 90 connected with the mounting connecting block 204, the primary lever 60 has an instantaneous displacement change and transmits the force to the secondary lever 70 through the connecting spring 90 connected with the first rear end 605 after the amplification through the lever ratio, the force transmitted to the secondary lever 70 is amplified again through the lever ratio of the secondary lever 70, and the second front end 701 of the secondary lever 70 (i.e. the photoelectric detection piece, which is located in the photoelectric detection slot 80 at the front end of the base 10) deviates from the original balance position. The photoelectric displacement sensor (not shown) detects the change of the light flux passing through the photoelectric detection slot 80 and feeds back to the double-lever weighing sensor circuit device to generate a corresponding compensation current. The current flows through the magnet sleeve set 30, and the magnet sleeve set 30 generates a compensation force (or a balance force) in the fixed magnetic field, so that the double lever returns to the balance state, i.e. the photoelectric detection piece returns to the balance position. The compensation current is collected and processed by the circuit part of the electronic balance to obtain the actual weight of the loaded load.

[0066] In a second aspect of the present disclosure, an electronic balance is provided, which comprises the double-lever weighing sensor provided in the first aspect of the present disclosure.

[0067] Specifically, the electronic balance can further comprise a housing, a weighing disc, a circuit part, etc.

[0068] In the present disclosure, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection; "connection" can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0069] In the description of the present disclosure, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the present disclosure.

[0070] In the description of the specification, the description of the terms "the embodiments", "this embodiment", "some embodiments", "certain embodiments" and the like is meant to include one or more embodiments or examples described in conjunction with the embodiments or examples. Illustrative expressions of the above terms do not necessarily refer to the same embodiment or example in the specification. Also, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0071] The above merely describes preferred embodiments of the present disclosure, and is not intended to limit the present disclosure. The present disclosure can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A double lever load cell, comprising: Base, bearing support, parallel conductor, lever piece and magnetic steel sleeve set; The bearing support is vertically arranged on the outer side of the front end of the base; The base comprises a mounting platform and walls arranged on both sides of the mounting platform, the top of the mounting platform and the walls on both sides jointly form a top-down accommodating cavity, the top of the wall is at least partially indented downward to form a top-up accommodating cavity above the top-down accommodating cavity, the bottom of the mounting platform and the walls on both sides jointly form a bottom accommodating cavity, the bottom of the mounting platform is downwardly protruded at the rear end to jointly form a bottom-up accommodating cavity with the walls on both sides through the bottom accommodating cavity, the bottom of the wall is at least partially indented upward to form a bottom-down accommodating cavity through the bottom accommodating cavity, the front and rear ends of the mounting platform are inwardly indented relative to the end portions of the walls on both sides to form mounting end portions, and the mounting end portions jointly form an end portion accommodating cavity with the walls on both sides which are outwardly protruded relative to the mounting end portions; The parallel conductor comprises top and bottom conductors for connecting the bearing support and the walls, the top and bottom conductors are respectively accommodated in the top-up accommodating cavity and the bottom-down accommodating cavity and are symmetrically arranged up and down; the magnetic steel sleeve set is installed upside down in the bottom accommodating cavity; The lever piece comprises a first lever accommodated in the top-down accommodating cavity and a second lever accommodated in the bottom-up accommodating cavity, the first front end of the first lever is connected with the bearing support and the mounting end portion in front, the first rear end of the first lever is connected with the second rear end of the second lever in up and down alignment, and the second front end of the second lever passes through the magnetic steel sleeve set and is located in the photoelectric detection slot at the front end of the base.

2. The dual lever load cell according to claim 1, characterized in that, The bearing support is configured as a plate structure, has a first top connecting wall with the top surface of the top conductor, a first bottom connecting wall with the bottom surface of the bottom conductor, and the side wall of the plate structure is arranged in alignment with the side wall of the wall on the same side.

3. The dual lever load cell according to claim 2, wherein, The top surface of the part of the wall top not indented forms a second top connecting wall with the top surface of the top conductor, and the top surface of the part of the wall bottom not indented forms a second bottom connecting wall with the bottom surface of the bottom conductor.

4. The dual lever load cell according to claim 3, wherein, The top of the two walls is indented downward near the second top connecting wall on the same side to form a top adjusting flat wall extending to the front end of the wall, and the bottom of the two walls is indented upward near the second bottom connecting wall on the same side to form a bottom adjusting flat wall extending to the front end of the wall, the two top adjusting flat walls are arranged in the same height, and the two bottom adjusting flat walls are arranged in the same height.

5. The dual lever load cell according to claim 4, wherein, The two walls are provided with an elongated adjusting hole arranged in the length direction of the base near the top adjusting flat wall, and the two walls are provided with an adjusting slot at the rear end corresponding to the elongated adjusting hole, a vertical screw hole is arranged on the wall at the adjusting slot, and an adjusting rod is screwed in the vertical screw hole.

6. The dual lever load cell according to claim 3, wherein, The top conductor and the bottom conductor are consistent in shape and structure, are configured as a frame type plate structure, and have a first connecting front end, a first connecting rear end, and a connecting body connecting the first connecting front end and the first connecting rear end; the first connecting front end of the top conductor is connected with the first top connecting wall, and the first connecting front end of the bottom conductor is connected with the first bottom connecting wall; the first connecting rear end of the top conductor is connected with the second top connecting wall, and the first connecting rear end of the bottom conductor is connected with the second bottom connecting wall.

7. The dual lever load cell according to claim 1, wherein, The primary lever is configured as a frame structure, having a first front end, a first rear end and a connecting section connecting the first front end and the first rear end; the first front end, the first rear end and the connecting section surround a central through hole; the first front end has a middle front end located in the middle and protruding outward, and symmetrical stepped side front ends located on both sides of the middle front end, the stepped side front ends include a first side front end located in the inside and a second side front end located in the outside, the middle front end is connected with the bearing support, the first side front end and the second side front end are connected with the front mounting end part on the mounting platform, and the middle front end and the stepped side front ends are located in the cavity of the rear end part; the first rear end has a first middle rear end located in the middle and protruding outward, and the first middle rear end is located in the cavity of the rear end part.

8. The dual lever load cell according to claim 7, characterized in that, The secondary lever is configured as a T-shaped strip structure, having a second rear end, a second front end and a main body section connecting the second rear end and the second front end, the second rear end has a second middle rear end located in the middle and protruding outward, and symmetrical side rear ends located on both sides of the second middle rear end, the second middle rear end is connected with the first middle rear end, the side rear ends are connected with the rear mounting end part, and the side rear ends are located in the cavity of the rear end part, and the main body section is located in the magnet sleeve group.

9. The dual lever load cell according to claim 1, wherein, The mounting platform is provided with a mounting hole in communication with the top cavity and the bottom cavity, and the bottom end of the magnet sleeve group is fitted into the mounting hole, and the remaining part of the magnet sleeve group is inverted and accommodated in the bottom cavity.

10. An electronic balance comprising the double-lever load cell according to any one of claims 1 to 9.

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