Load cell and its lever

Abstract

The present invention discloses a weighing sensor and a lever thereof, wherein the weighing sensor comprises: a bearing part, a fixing part and a parallel guide part connecting the bearing part and the fixing part; the parallel guide part comprises a separated upper parallel guide unit and a lower parallel guide unit, and the two ends of the upper parallel guide unit and the lower parallel guide unit are respectively connected to the bearing part and the fixing part; the extension part of the fixing part is located between the upper parallel guide unit and the lower parallel guide unit, and is provided with a distance from the upper parallel guide unit and the lower parallel guide unit and extends to the bearing part, and a gap is formed between the extension part and the bearing part; the distance between the extension part and the upper parallel guide unit allows the lever to pass through. The weighing sensor of the present invention has a simple structure, and the processing technology and assembly technology are simplified, which is convenient for production, processing and assembly.

Description

Technical Field

[0001] The invention relates to a weighing sensor and a lever thereof, in particular to a weighing sensor and a lever thereof used for an electronic balance. Background Art

[0002] At present, the weighing sensors used in electronic balances are basically electromagnetic force compensation sensors. With the continuous development and improvement of technology, higher requirements are put forward for the weighing sensors used in electronic balances, such as small size, high precision, low cost, simple assembly, etc.

[0003] Traditional weighing sensors use die-casting as the main assembly parts, so they are large in size, have many parts, are complex to assemble, have large assembly tolerances, and have unstable quality. In order to improve the shortcomings of weighing sensors with die-casting structures, currently weighing sensors use highly integrated single-module weighing sensors and semi-integrated weighing sensors. However, this structure often has complex processing technology, inconvenient assembly, and high cost.

[0004] In the process of sensor assembly, the assembly of the lever is a very important assembly process, which is directly related to the weighing performance of the weighing sensor.

[0005] At present, some lever assembly methods are to assemble it from the outside of the sensor. In this way, the size of the lever is relatively large, and because it is on the outside of the sensor, it is also easily affected by external factors.

[0006] In addition, there is an assembly method that is directly assembled from top to bottom, that is, after installing the lever, the guide plate is assembled. This assembly method requires more assembly time and assembly parts, which is not economical.

[0007] Another method is to integrate the lever and the sensor body into an integral structural part. This method does not have the above-mentioned assembly problem, but this method is very expensive and not conducive to production. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the defects of the weighing sensor in the prior art such as complex processing technology and inconvenient assembly. The structure of the weighing sensor and its lever is provided to simplify the processing technology and assembly process, thereby saving production costs.

[0009] The present invention solves the above technical problems through the following technical solutions:

[0010] The present invention provides a weighing sensor, which comprises: a bearing part, a fixing part and a parallel guide part connecting the bearing part and the fixing part;

[0011] The parallel guide portion comprises a separate upper parallel guide unit and a lower parallel guide unit, and two ends of the upper parallel guide unit and the lower parallel guide unit are respectively connected to the bearing portion and the fixing portion;

[0012] The extension portion of the fixing portion is located between the upper parallel guiding unit and the lower parallel guiding unit, is spaced apart from the upper parallel guiding unit and the lower parallel guiding unit, extends to the bearing portion, and forms a gap with the bearing portion;

[0013] The distance between the extending portion and the upper parallel guiding unit can allow a lever to pass through and enter into a lever accommodating space formed by the fixing portion, the upper parallel guiding unit and the bearing portion.

[0014] The extension part of the fixed part of the present invention divides the parallel guide part into two different spaces, wherein the distance between the upper parallel guide unit and the extension part in the space formed by the combination of the upper parallel guide unit and the extension part is large enough to allow the lever to pass through and be assembled into the space formed by the combination of the fixed part, the upper parallel guide unit and the extension part in the weighing sensor.

[0015] Preferably, the parallel guiding portion, the fixing portion and the bearing portion are integrally formed.

[0016] All components in the present invention are integrally formed. This design simplifies the structure of the weighing sensor and makes processing and assembly more convenient.

[0017] Preferably, the connection between the parallel guiding portion, the fixing portion and the bearing portion is a thin sheet.

[0018] In the present invention, the connection parts between the various components utilize the existing processing technology of the weighing sensor and require cutting and processing into thin slices, thereby enhancing the relative movement range of various parts.

[0019] Preferably, the extension portion and the bearing portion are detachably connected via a temporary connecting piece.

[0020] In the present invention, the extension part and the bearing part are fixed by a temporary fixing connection component, that is, the fixing part and the bearing part are fixed as a whole, so as to avoid the influence of accidental vibration, especially accidental vibration during transportation, on the weighing sensor.

[0021] Preferably, the extending portion and the bearing portion are connected via a connecting portion, and the connecting portion is a thin sheet.

[0022] The present invention can also pre-connect the extension part and the bearing part during the manufacturing process, and the connection is also processed into a thin sheet, which can also avoid the influence of accidental vibration on the weighing sensor. At the same time, when the connection between the extension part and the bearing part is not needed, the thin sheet can be cut off to cut off the connection between the extension part and the bearing part. In addition, this method can also use the cutting action of the thin sheet to adjust the stress in the entire weighing sensor.

[0023] Preferably, the cross-sectional lengths of the ends of the upper parallel guiding unit respectively connecting the two ends of the bearing portion and the fixing portion are the same.

[0024] For example, the upper parallel guide unit forms a rectangular shape between the bearing portion and the fixing portion, or other shapes with the same length of sides at both ends.

[0025] Preferably, when the cross-sectional lengths of the ends of the upper parallel guiding unit respectively connecting the load-bearing part and the fixed part are different, in the direction from the end connected to the load-bearing part to the end connected to the fixed part, the distance between the two sides of the upper parallel guiding unit gradually transforms from the cross-sectional length of the end connected to the load-bearing part to the cross-sectional length of the end connected to the fixed part.

[0026] The two sides of the upper parallel guide unit are two upper parallel guide unit boundary contour lines adjacent to the end portions connecting the two ends of the bearing portion and the fixing portion.

[0027] Preferably, the distance between the two sides of the upper parallel guide unit is linearly transformed from the cross-sectional length of the end connected to the bearing portion to the cross-sectional length of the end connected to the fixing portion.

[0028] Preferably, the fixing portion is provided with a mounting position for mounting the magnet, and the mounting position is provided with a plurality of slots.

[0029] The mounting position in the present invention belongs to the structure inside the fixing part, such as a mounting groove or a mounting opening provided on the fixing part.

[0030] Preferably, a groove is provided on both sides of one end of the mounting position away from the bearing portion. Stress is released by the grooves.

[0031] Preferably, the bearing portion has a protrusion extending toward the fixing portion, a through hole is provided between the bearing portion and the protrusion in a direction perpendicular to the parallel guide portion, the protrusion is provided with a mounting position for mounting a spring leaf, and the spring leaf is arranged at the mounting position through the through hole.

[0032] The present invention simplifies the structure and installation method of the bearing part and the lever through the design of the through hole.

[0033] Preferably, the protrusion is further provided with a mounting boss in a direction away from the upper parallel guiding unit.

[0034] The present invention further highlights the mounting portion for connecting the lever, so as to facilitate installation and maintenance.

[0035] Preferably, at least one through hole is provided on the bearing portion in a direction parallel to the guiding portion, wherein at least one through hole faces the mounting protrusion or the mounting position.

[0036] The present invention facilitates the operation of the installation position or the installation protrusion and the like through the through hole.

[0037] The present invention provides a lever, which is suitable for the weighing sensor as described above, and comprises a mounting portion connected to a fixing portion of the weighing sensor, a connecting portion, and a magnet connecting portion for mounting a magnet, wherein two ends of the connecting portion are respectively connected to the mounting portion and the magnet connecting portion;

[0038] The thickness of the lever can enter the lever accommodating space through the lever accommodating space opening of the weighing sensor.

[0039] In order to reduce the number of assembled parts, the present invention improves the existing form of assembling the weighing sensor from the periphery, redesigns the structure of the lever, and reduces the volume of the lever, especially the thickness of the lever, so that the lever can enter the lever accommodation space inside the weighing sensor through the opening of the lever accommodation space formed by the parallel guide part, the fixing part and the bearing part of the weighing sensor, thereby avoiding the lever being located at the periphery of the sensor.

[0040] Furthermore, since the lever accommodation space inside the existing weighing sensor is relatively large in length and width, as long as the thickness of the lever can meet the requirements, the lever can enter the lever accommodation space, thereby realizing the assembly of the lever.

[0041] Preferably, the mounting portion, the connecting portion and the magnet connecting portion are integrally formed.

[0042] The number of parts is further reduced, the difficulty of processing and assembly is reduced, and the cost is reduced.

[0043] Preferably, the connecting portion comprises a first main body portion and a second main body portion connected to each other, the first main body portion and the mounting portion are integrally formed, and the second main body portion and the magnet connecting portion are integrally formed.

[0044] The present invention can also adopt a two-section structure to make the lever.

[0045] Preferably, the mounting portion is strip-shaped, and three mounting positions are provided along the length direction of the mounting portion, and the mounting positions are all used to install the reed.

[0046] The mounting position of the mounting part in the present invention is connected to other components of the weighing sensor through a spring.

[0047] Preferably, the connecting portion is a sheet-shaped triangle, the bottom of the triangle is connected to the mounting portion, and the top of the triangle is connected to the magnet connecting portion.

[0048] The structure of the present invention is more secure and easier to install.

[0049] Of course, the present invention does not limit the specific shapes of the mounting portion and the connecting portion. The shape and size of the connecting portion and the mounting portion of the lever can be arbitrarily adjusted according to the shape of the lever accommodating space of the actual weighing sensor and the shape and size of the opening of the lever accommodating space.

[0050] Preferably, the magnet connecting part is provided with a coil assembly of a magnet or the magnet connecting part is a coil assembly of a magnet.

[0051] The present invention further directly makes the connecting part of the lever and the magnet into the coil part of the magnet, thereby simplifying the structure of the weighing sensor.

[0052] Preferably, a light shielding plate of a photoelectric sensor is also provided on the magnet connecting portion.

[0053] The present invention utilizes the movement of a lever to drive a light shielding plate of a photoelectric sensor to realize position detection.

[0054] The positive and progressive effects of the present invention are:

[0055] The weighing sensor of the present invention has a simple structure, and the processing technology and the assembly technology are simplified, so the production, processing and assembly are convenient.

[0056] In addition, the weighing sensor structure adopted by the present invention also reduces the cost of production and processing. And the assembled weighing sensor has a small volume and excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] 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 the same reference numerals always represent the same features, wherein:

[0058] Figure 1 It is a three-dimensional schematic diagram of a weighing sensor according to embodiment 1 of the present invention.

[0059] Figure 2 It is a cross-sectional view along the center line of the weighing sensor of Example 1 of the present invention.

[0060] Figure 3 It is a three-dimensional schematic diagram of a weighing sensor according to embodiment 2 of the present invention.

[0061] Figure 4 It is a three-dimensional schematic diagram of the lever of Example 1 of the present invention.

[0062] Figure 5 It is a cross-sectional view along the center line of the lever of Example 1 of the present invention.

[0063] Figure 6 It is a top view of the lever of Example 1 of the present invention.

[0064] Figure 7 It is a three-dimensional schematic diagram of the lever of Example 2 of the present invention.

[0065] Figure 8 This is a cross-sectional view of the weighing sensor along the center line.

[0066] Fig. 9 This is a cross-sectional view along the centerline of another type of weighing sensor.

[0067] Fig.10 It is a cross-sectional view of the load-bearing portion of the load cell according to the first embodiment of the present invention.

[0068] Description of Reference Numerals

[0069] Load Cell 1

[0070] Carrying part 11

[0071] Main body part 111

[0072] The first extension portion 112

[0073] The first through hole groove 113

[0074] The first connection mounting portion 114

[0075] The second through hole groove 115

[0076] The third through hole groove 116

[0077] Fixed part 12

[0078] Main body 121

[0079] Extension 122

[0080] Mounting parts 1221, 1222

[0081] Gap 123

[0082] Parallel guides 13, 13'

[0083] Upper parallel guide unit 131, 131'

[0084] Lower parallel guide unit 132, 132'

[0085] First through hole 133

[0086] The second through hole 134

[0087] Main body part 1311,1311'

[0088] Slice 1312,1312'

[0089] First Containment Space 1241

[0090] Second containment space 17, 1242

[0091] Lever 2,2'

[0092] First mounting portion 21, 21'

[0093] Second mounting portion 22, 22'

[0094] The third mounting portion 23, 23'

[0095] Main body 24,24'

[0096] Fourth mounting portion 25, 25'

[0097] Fourth mounting portion upper surface 251, 251'

[0098] Coil assembly 6,6'

[0099] Coil assembly lower surface 61, 61' DETAILED DESCRIPTION

[0100] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0101] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0102] Furthermore, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the present invention specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this document.

[0103] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings connoted by each term.

[0104] The integrally formed bearing part, fixing part and parallel guiding part of the present invention can reduce the structural complexity and the processing load degree. In addition, the installation of the lever is facilitated by controlling the distance between the extension part of the bearing part and the parallel guiding part.

[0105] In addition, the extension part and the fixing part of the load-bearing part are temporarily connected to avoid damage caused by accidental vibration and stress adjustment, and the stress of the weighing sensor is adjusted by slotting the fixing part.

[0106] The following embodiments illustrate the implementation of the present invention.

[0107] Example 1

[0108] like Figure 1 As shown, the weighing sensor 1 of this embodiment includes a bearing portion 11, a fixing portion 12, and a parallel guide portion 13 connecting the bearing portion 11 and the fixing portion 12. In this embodiment, the bearing portion 11, the fixing portion 12, and the parallel guide portion 13 are an integrally formed structure, that is, they are machined from a whole piece of material. Such a design makes the weighing sensor 1 simple in structure and more convenient to process and assemble.

[0109] Furthermore, in another embodiment, the bearing portion 11 , the fixing portion 12 and the parallel guiding portion 13 may also be separate structures, and then assembled to form the weighing sensor 1 .

[0110] The fixing part 12 includes a main body 121 and an extension part 122 extending forward from the front end surface of the main body 121. The main body 121 of the fixing part 12 is provided with a mounting position for mounting a magnet (a groove where the fixing part 12 has a circular through hole in the figure), and the mounting position is provided with a first separation groove and a second separation groove (not shown in the figure) penetrating from the upper surface to the lower surface of both sides of the main body 121. This arrangement can release the stress generated during assembly and improve the weighing performance of the weighing sensor.

[0111] In another embodiment, the number of slots at the installation position is greater, such as four slots symmetrically arranged in pairs. For those skilled in the art, the number and manner of the slots can be freely designed according to the requirements and degree of stress release, and are not limited to the number and manner of the slots cited in the embodiment.

[0112] In this embodiment, the front end surface of the extension part 122 includes mounting parts 1221 and 1222 on both sides for connecting the lever and the extension part 122. In this embodiment, the mounting parts 1221 and 1222 are connected to the lever through springs respectively. In another embodiment, the extension part can also be connected to the lever through only one spring.

[0113] The extension portion 122 and the bearing portion 11 are separated by a gap 123 extending transversely therethrough. Figure 2As shown, before the assembly is completed, in order to prevent the influence of accidental vibration during transportation, the one-piece molding technology is used in this embodiment to achieve a temporary connection between the extension part 122 and the bearing part 11 through a cut thin sheet. After the weighing sensor is assembled into a finished product, the thin sheet is cut to form a transversely penetrating gap 123, at which time the extension part 122 and the bearing part 11 can move relative to each other.

[0114] In another embodiment, the extension portion 122 and the bearing portion 11 may be fixedly connected by temporarily adding a hinged connection structure.

[0115] The parallel guide portion 13 connects the fixing portion 12 and the bearing portion 11, and includes an upper parallel guide unit 131 and a lower parallel guide unit 132, and both the upper parallel guide unit 131 and the lower parallel guide unit 132 are at a certain distance from the extension portion 122. The distance can be adjusted according to design requirements.

[0116] like Figure 1 As shown, the upper parallel guide unit 131 includes a main body 1311 and thin sheets 1312 at both ends, and the two ends of the main body 1311 are respectively connected to the fixing part 12 and the bearing part 11 through two thin sheets. Since this embodiment is integrally formed, the thin sheets 1312 are formed by cutting.

[0117] In addition, in this embodiment, for the convenience of processing, the width of the main body portion 1311 in the lateral direction is equal to the width of the fixing portion 12 in the lateral direction.

[0118] The upper parallel guide unit 131 is provided with a first through hole 133 penetrating from the upper surface to the lower surface of the upper parallel guide unit 131 near the bearing portion 11, and the upper parallel guide unit 131 is provided with a second through hole 134 penetrating from the upper surface to the lower surface of the upper parallel guide unit 131 near the fixing portion 12. The size and shape of the first through hole 133 and the second through hole 134 are changed with the structure of the lever and are not limited to the attached Figure 1 Shapes and sizes shown.

[0119] The main body 121 and the upper parallel guiding unit 131, the bearing part 11, and the extension part 122 form a first receiving space, and the main body 121 and the lower parallel guiding unit 132, the bearing part 11, and the extension part 122 form a second receiving space 17. In this embodiment, the spatial volume of the first receiving space is greater than the spatial volume of the second receiving space 17.

[0120] Such a configuration makes it easier to assemble the lever, that is, at this time, the distance between the upper parallel guide unit 131 and the extension portion 122 is large enough to allow the lever to enter the first receiving space through the upper parallel guide unit 131 and the extension portion 122. In this embodiment, the lever can enter the first receiving space from the openings on both sides of the weighing sensor 1 as shown in the figure, or can enter the first receiving space through the opening where the installation position is located. Each opening is adapted to different lever shapes, and the lever can enter the first receiving space from different openings according to different lever shapes.

[0121] like Figure 4-6 As shown, the mounting portion of the lever 2 of this embodiment connected to the fixed portion of the weighing sensor includes a first mounting portion 21, a second mounting portion 22 and a third mounting portion 23, and these three mounting portions are connected to other components of the weighing sensor through a reed. As shown in the figure, the mounting portion in this embodiment is approximately a strip-shaped structure, and in another embodiment, the mounting portion can also be an arc or other shape.

[0122] The lever 2 of this embodiment further includes a body portion 24 and a fourth mounting portion 25, one end of the body portion 24 is connected to the mounting portion, and the other end is connected to the fourth mounting portion 25. The body portion 24, the fourth mounting portion 25 and the mounting portion are integrally formed and machined from a whole piece of material, so that the lever structure is simple and easy to process.

[0123] The main body 24 is a triangular structure similar to a sheet, wherein the bottom of the triangle is connected to the mounting portion, and the top of the triangle is connected to the fourth mounting portion 25.

[0124] In another embodiment, the main body 24 is a strip-shaped structure. In a modified example, the main body is a trapezoidal structure, with the long side connected to the mounting portion and the short side connected to the fourth mounting portion 25. It can be seen that for those skilled in the art, the shape of the main body 24 can be arbitrarily selected, as long as it can enter and be placed in the lever accommodation space of the weighing sensor, it can be used in the present invention.

[0125] In this embodiment, the fourth mounting portion 25 is mounted with a coil assembly 6 having a magnet. In another embodiment, the fourth mounting portion 25 may be replaced with a coil assembly, thereby further simplifying the structure of the weighing sensor.

[0126] The lever 2 of this embodiment can be placed on Figure 8 In the first receiving space 1241 shown in FIG. 1 , the thickness of the lever 2 is smaller than the distance a or b between the upper parallel guide unit 131 and the extension portion. Figure 2 As shown, in this embodiment, the thickest part of the lever 2 is the fourth mounting portion 25 , that is, the thickness c of the fourth mounting portion 25 is smaller than the distance a or b between the upper parallel guide unit 131 and the extension portion.

[0127] like Figure 8 and Fig. 9 As shown, the accommodation space for the weighing sensor of the lever 2 is surrounded by the parallel guide part, the fixing part and its extension part, and the bearing part. The lower surface of the lower parallel guide unit 132, the bearing part, and the extension part forms a second receiving space 1242 located in the accommodation space. The extension part and the bearing part are separated by a horizontally penetrating gap 123. Figure 8 and Fig. 9 The middle extension part and the bearing part are also connected by a temporary connection part to fix the extension part and the bearing part.

[0128] It can be seen that in this embodiment, the height b of one end of the extension portion close to the fixed portion from the upper parallel guide unit 131 is equal to the height a of the other end close to the load-bearing portion from the upper parallel guide unit 131, and the height b of one end of the extension portion close to the fixed portion from the upper parallel guide unit 131 and the height a of one end close to the load-bearing portion from the upper parallel guide unit 131 are both greater than the distance c from the upper surface 251 of the fourth mounting portion 25 to the lower surface 61 of the coil assembly 6.

[0129] At this time, the lever 2 can enter the first receiving space 1241 through the opening between the upper parallel guide unit 131 and the extension portion. Thus, the assembly of the lever 2 in the weighing sensor is realized. It can be seen that although the lever is assembled in the weighing sensor, it does not need to be assembled on the periphery, but assembled inside. At the same time, since the lever enters the receiving space of the weighing sensor through the opening, it is not necessary to assemble the guide sheet and other components in sequence, which simplifies the assembly steps while reducing the assembly components.

[0130] In another embodiment, if Fig. 9 As shown, the height b' of one end of the extension part close to the fixed part from the upper parallel guide unit 131 is greater than the height a' of the other end close to the bearing part from the upper parallel guide unit 131, the height b' of one end of the extension part close to the fixed part from the upper parallel guide unit 131 is greater than the distance c from the upper surface 251 of the fourth mounting part 25 to the lower surface 61 of the coil assembly 6, and the height a' of the other end close to the bearing part from the upper parallel guide unit 131 is greater than the thickness of the body part 24 and the fixed part. This height setting can enhance the strength of the extension part of the weighing sensor.

[0131] In addition, in this embodiment, the widths d and e on the lever 2 body are smaller than the width of the through hole on the upper parallel guide unit 131. This arrangement allows the lever 2 to be assembled from the through hole on the upper parallel guide unit 131, and the lever can only be assembled from different openings of the weighing sensor.

[0132] In another embodiment, for a more compact structure, the width of the through hole on the upper parallel guide unit 131 is not wide enough for the lever 2 to enter, that is, the lever 2 can enter the first receiving space 1241 only through the opening between the parallel guide unit 131 and the extension portion.

[0133] In addition, in this embodiment, a light shielding sheet for a photoelectric sensor is also installed on the fourth mounting portion 25. The light shielding sheet in this embodiment has a notch, and the photoelectric sensor determines the position state or motion state of the lever 2 connected to the light shielding sheet by detecting whether the light passes through the notch. In this embodiment, the light shielding sheet can use light shielding sheets with different structures corresponding to photoelectric sensors with different structures.

[0134] like Fig.10 As shown, the bearing part 11 includes a main body 111, a first extension part 112 extending from the main body 111 toward the fixing part 12, a first through hole slot 113 vertically penetrating from top to bottom is provided between the main body 111 and the first extension part 112, a first connecting and mounting part 114 for mounting a connecting spring sheet extends from the lower surface of the first extension part 112, and the bearing body 111 includes two second through hole slots 115 and a third through hole slot 116 penetrating in the axial direction. The structure of the bearing part in this embodiment is more lightweight, light in weight, and has stable performance.

[0135] In another embodiment, a mounting portion for connecting the spring sheet is disposed on the first extension portion 112 , which can further simplify the structure of the bearing portion, and the through hole 116 faces the mounting portion on the first extension portion 112 .

[0136] In yet another embodiment, the through hole 115 is eliminated to further simplify the structure of the bearing portion.

[0137] The first connecting and mounting portion 114 connects the first connecting and mounting portion 114 of the bearing portion with the lever 2 through a connecting spring to serve as a force transmitting portion of the lever 2. When the load is loaded on the bearing portion 11, the force is transmitted to the lever 2 through the connecting spring, and the lever 2 loses balance. After being magnified by the long arm of the lever 2, the shading plate on the tail end of the lever 2 deviates from the original equilibrium position. In this embodiment, the photoelectric displacement sensor detects that the light flux passing through the notch of the shading plate on the lever 2 as shown in the figure changes, and feeds back to the weighing sensor circuit device to cause it to generate a corresponding compensation current. This current flows through the coil assembly 6 located at the end of the long arm of the lever, and the coil assembly 6 generates a compensation force, or a balancing force, in a fixed magnetic field, so that the lever 2 returns to a balanced state, that is, the shading plate returns to a balanced position. The compensation current is subjected to a series of data collection and data processing by the circuit part of the electronic balance to obtain the actual weight of the loaded load.

[0138] Moreover, in this embodiment, the connecting spring can be arranged between the bearing body 111 and the first extension portion 112, which can protect the connecting spring and improve the performance of the sensor, while the structure is more compact.

[0139] Example 2

[0140] like Figure 3 As shown, the difference between this embodiment and the first embodiment lies in the shape and structure of the parallel guide portion 13' and the lever 2'.

[0141] In this embodiment, the parallel guide portion 13' includes an upper parallel guide unit 131' and a lower parallel guide unit 132'. The upper parallel guide unit 131' includes a main body 1311' and thin sheets 1312' at both ends. The width of the main body 1311' in the transverse direction close to the fixing portion 12 is greater than the width in the transverse direction close to the bearing portion 11. Figure 3 As shown, the contour lines of the two sides of the upper parallel guiding unit 131 ′ are straight lines, that is, the main body 1311 ′ forms a trapezoidal shape, and the contour lines of the two sides of the upper parallel guiding unit 131 ′ are the hypotenuses of the trapezoid.

[0142] like Figure 7 As shown, the lever 2' of this embodiment is a split structure, and the lever 2' includes a mounting portion connected to the fixed portion of the weighing sensor, and the mounting portion includes a first mounting portion 21', a second mounting portion 22' and a third mounting portion 23', and these three mounting portions are connected to other components of the weighing sensor through a spring. Figure 4 As shown, this embodiment and embodiment 1 use the same mounting portion structure.

[0143] In this embodiment, the lever 2' further comprises a main body portion 24' formed by a first main body portion and a second main body portion fixedly connected to each other. The first main body portion and the mounting portion are integrally formed, and the second main body portion and the fourth mounting portion 25' are integrally formed.

[0144] The coil assembly 6' and the light shielding sheet are mounted on the fourth mounting portion 25', and the distance c from the upper surface 251' of the fourth mounting portion 26' to the lower surface 61' of the coil assembly 6' is the same as that in the first embodiment.

[0145] In another embodiment, the main body 24' is composed of three parts connected in sequence.

[0146] That is, in this embodiment, the distance between the two side edges of the upper parallel guiding unit 131 ′ is linearly transformed from the cross-sectional length of the end portion connected to the bearing portion to the cross-sectional length of the end portion connected to the fixing portion.

[0147] In another embodiment, the contour lines of the two sides may also be in the form of arcs, etc. In this embodiment, the boundary contour lines of the two sides of the upper parallel guide unit 131' are retracted toward the inside of the weighing sensor to avoid accidental contact with the upper parallel guide unit 131'.

[0148] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A weighing sensor, characterized in that: include: A bearing portion, a fixing portion, a parallel guide portion connecting the bearing portion and the fixing portion, and a lever; The parallel guide portion comprises a separate upper parallel guide unit and a lower parallel guide unit, and two ends of the upper parallel guide unit and the lower parallel guide unit are respectively connected to the bearing portion and the fixing portion; The extension portion of the fixing portion is located between the upper parallel guiding unit and the lower parallel guiding unit, is spaced apart from the upper parallel guiding unit and the lower parallel guiding unit, extends to the bearing portion, and forms a gap with the bearing portion; A through hole is provided on the upper parallel guiding unit, or an opening is provided between the upper parallel guiding unit and the fixing portion. The lever is assembled in the lever accommodating space formed by the fixing portion, the upper parallel guiding unit and the bearing portion through the through hole or the opening. The distance between the extension portion and the upper parallel guiding unit allows the lever to pass through.

2. The weighing sensor according to claim 1, characterized in that: The parallel guiding portion, the fixing portion and the bearing portion are integrally formed.

3. The weighing sensor according to claim 2, characterized in that: The extension part and the bearing part are also detachably connected via a temporary connecting sheet, or the extension part and the bearing part are connected via a connecting part, and the connecting part is a thin sheet.

4. The weighing sensor according to claim 2, characterized in that: The cross-sectional lengths of the ends of the upper parallel guide unit respectively connecting the two ends of the bearing part and the fixing part are the same, or When the cross-sectional lengths of the ends of the upper parallel guiding unit respectively connecting the load-bearing part and the fixed part are different, in the direction from the end connected to the load-bearing part to the end connected to the fixed part, the distance between the two sides of the upper parallel guiding unit gradually changes from the cross-sectional length of the end connected to the load-bearing part to the cross-sectional length of the end connected to the fixed part.

5. The weighing sensor according to claim 4, characterized in that: The distance between the two sides of the upper parallel guide unit is linearly transformed from the cross-sectional length of the end connected to the bearing portion to the cross-sectional length of the end connected to the fixing portion.

6. The weighing sensor according to claim 2, characterized in that: The fixing portion is provided with an installation position for installing the magnet, and the installation position is provided with a plurality of slots.

7. The weighing sensor according to claim 6, characterized in that: At least one groove is respectively provided on two sides of an end of the installation position away from the bearing portion.

8. The weighing sensor according to any one of claims 1 to 7, characterized in that: The bearing part has a protrusion extending toward the fixing part, a through hole is provided between the bearing part and the protrusion in a direction perpendicular to the parallel guide part, the protrusion has an installation position for installing a spring leaf, and the spring leaf is arranged at the installation position through the through hole.

9. The weighing sensor as claimed in claim 8, characterized in that The protrusion is further provided with a mounting protrusion in a direction away from the upper parallel guide unit.

10. The weighing sensor as claimed in claim 9, characterized in that At least one through hole is arranged on the bearing portion in a direction parallel to the guiding portion, wherein at least one through hole faces the mounting protrusion or the mounting position.

11. A lever, characterized in that: A weighing sensor suitable for use in any one of claims 1 to 10, comprising: A mounting portion, a connecting portion and a magnet connecting portion for installing a magnet are connected to the fixing portion of the weighing sensor, wherein two ends of the connecting portion are respectively connected to the mounting portion and the magnet connecting portion; The thickness of the lever can enter the lever accommodating space through the lever accommodating space opening of the weighing sensor.

12. The lever according to claim 11, characterized in that The mounting portion, the connecting portion and the magnet connecting portion are integrally formed, or The connecting portion includes a first body portion and a second body portion connected to each other, the first body portion and the mounting portion are integrally formed, and the second body portion and the magnet connecting portion are integrally formed.

13. The lever according to claim 11, characterized in that The connecting part is a sheet-shaped triangle, the bottom of the triangle is connected to the mounting part, and the top of the triangle is connected to the magnet connecting part.

14. The lever according to claim 11, characterized in that The magnet connection part is provided with a coil assembly of a magnet or the magnet connection part is a coil assembly of a magnet.

15. The lever according to claim 11, characterized in that A light shielding plate of a photoelectric sensor is also arranged on the magnet connecting part.

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