Anti-cheating electronic scale

Abstract

The invention relates to an anti-cheating electronic scale which comprises a front weight and a rear weight which are symmetrically arranged on the front side and the rear side of a weighing sensor, and a left weight hanging frame used for being matched with the left end of the front weight and the left end of the rear weight is arranged on a left force transmission beam. The right force transmission beam is provided with a right weight hanging frame used for being matched with the right ends of the front weight and the rear weight, and the base is provided with a weight driving mechanism used for driving the front weight and the rear weight to ascend and descend synchronously. And the front side weight and the rear side weight are driven by the weight driving mechanism to have a calibration station which moves downwards to synchronously fall on the corresponding weight hangers and an idle station which moves upwards to be separated from the corresponding weight hangers. According to the invention, the technical problem in the prior art that the calibration precision is influenced because the weight deviates to one side of the weighing sensor is solved.

Description

Technical Field

[0001] The invention relates to the field of measurement and calibration of weighing equipment, and in particular to an anti-cheating electronic scale. Background Art

[0002] Electronic scales, also known as electronic measuring scales, are a type of weighing instrument. They are commonly used in people's daily lives. They are used to weigh the mass of heavy objects. For example, vendors need to use electronic scales to weigh fruits and vegetables when selling them.

[0003] Electronic scales rely on their internal weighing sensors to weigh the weight of goods. In the prior art, some unscrupulous vendors privately adjust the weighing sensors of electronic scales in pursuit of profits, which is also called "adjusting the scales". "Seven-ounce scales" and "eight-ounce scales" have appeared in the market, so it is necessary to calibrate the electronic scales in time. For this reason, the applicant has developed a patent "an electronic weighing scale with self-calibration function" with publication number CN221260050U. The electronic weighing scale includes a shell and a base, a weighing sensor is arranged on the base, a force transmission bracket is arranged on the upper side of the weighing sensor, a scale pan for placing objects is arranged on the upper side of the force transmission bracket, the force transmission bracket includes a left force transmission beam extending in the front-to-back direction and a right force transmission beam extending in the front-to-back direction, the force transmission bracket also includes a middle force transmission beam connected between the left force transmission beam and the right force transmission beam and extending in the left-right direction, and the weighing sensor is arranged on the lower side of the middle force transmission beam.

[0004] A calibration weight that can move up and down is arranged in the shell, a weight lifting mechanism for driving the calibration weight to move up and down is arranged on the base, a weight hanger is arranged on the force transmission bracket, the calibration weight is located on the upper side of the weight hanger, and when the calibration weight is driven by the weight lifting mechanism to move up and down, it has a calibration position where it moves downward and falls on the weight hanger, and an idle position where it moves upward and is spaced apart from the weight hanger.

[0005] When the electronic scale is in normal use, the calibration weight is driven by the weight lifting mechanism to an idle position at a higher position. At this time, when the heavy object is weighed, the weight of the heavy object is transmitted to the weighing sensor through the force transmission bracket, thereby realizing the normal use of the electronic scale; when the electronic scale needs to be calibrated, the weight lifting mechanism drives the calibration weight to a lower calibration position. At this time, the weight of the weight is transmitted to the force transmission bracket through the weight hanger, and then weighed by the weighing sensor, thereby achieving the purpose of using the weight to calibrate the weighing sensor.

[0006] The problem with the existing electronic scale is that there is only one weight, which is placed on one side of the weighing sensor. Therefore, the force of the weight is not in a straight line with the weighing sensor. Under the action of the weight, the force transmission bracket will generate a deflection torque on the weighing sensor, affecting the accurate weighing process of the weighing sensor and thus affecting the calibration accuracy of the electronic scale. Summary of the invention

[0007] The object of the present invention is to provide an anti-cheating electronic scale to solve the technical problem in the prior art that the weight is biased toward one side of the weighing sensor and thus affects the calibration accuracy.

[0008] In order to solve the above technical problems, a technical solution of an anti-cheating electronic scale in the present invention is as follows: An anti-cheating electronic scale comprises a shell and a base, a weighing sensor is arranged on the base, a force transmission bracket is arranged on the upper side of the weighing sensor, a weighing pan for placing an object is arranged on the upper side of the force transmission bracket, the force transmission bracket comprises a left force transmission beam with a length extending in the front-back direction and a right force transmission beam with a length extending in the front-back direction, the force transmission bracket also comprises an intermediate force transmission beam connected between the left force transmission beam and the right force transmission beam and with a length extending in the left-right direction, the weighing sensor is arranged on the lower side of the intermediate force transmission beam, and the anti-cheating electronic scale also comprises a plurality of force transmission beams symmetrically arranged on the weighing sensor. The front weights and rear weights on the front and rear sides of the sensor, a left weight bracket for cooperating with the left ends of the front weights and the rear weights is arranged on the left force transmission beam, a right weight bracket for cooperating with the right ends of the front weights and the rear weights is arranged on the right force transmission beam, a weight driving mechanism for driving the front weights and the rear weights to rise and fall synchronously is arranged on the base, the front weights and the rear weights are driven by the weight driving mechanism to move downward and fall synchronously on the corresponding weight brackets for calibration and to move upward and separate from the corresponding weight brackets for idle positions.

[0009] Furthermore, the weight driving mechanism includes a front column and a rear column symmetrically arranged on the front and rear sides of the weighing sensor, the front side surface of the front column and the rear side surface of the rear column are arc-shaped surfaces extending along the vertical direction of the axis, the rear side surface of the front column and the front side surface of the rear column are planes perpendicular to the front and rear directions, the weight driving mechanism also includes a front lifting slider rotatably mounted on the front side surface of the front column and a rear lifting slider rotatably mounted on the rear side surface of the rear column, and the front lifting slider and the rear lifting slider are both corresponding arc-shaped surfaces An arc-shaped slider is arranged coaxially, and a front lifting protrusion is arranged on the top of the front lifting slider, and the left and right ends of the front lifting protrusion are connected to the front lifting slider through the front lifting slider transition slope, and a front weight protrusion matching with the front lifting protrusion is arranged at the bottom of the front weight; a rear lifting protrusion is arranged on the top of the rear lifting slider, and the left and right ends of the rear lifting protrusion are connected to the rear lifting slider through the rear lifting slider transition slope, and a rear weight protrusion matching with the rear lifting protrusion is arranged at the bottom of the rear weight.

[0010] Furthermore, two front guide rods arranged left and right are provided on the base at the front side of the weighing sensor, the front lifting slider is located between the two front guide rods, and the front weight cooperates with the two front guide rods to guide movement.

[0011] Furthermore, two rear guide rods arranged left and right are provided on the base at the rear side of the weighing sensor, the rear lifting slider is located between the two rear guide rods, and the rear weight cooperates with the two rear guide rods to guide movement.

[0012] Furthermore, the weight driving mechanism includes a reel whose axis is driven by a motor and extends in the up-down direction, a first pull rope and a second pull rope are wound on the reel, the first pull rope is connected to one end of the front lifting slider, a front reversing pulley for the first pull rope to be wound around and reversed is provided on the front side of the weighing sensor, and a front lifting slider reset spring is also connected to the front lifting slider; the second pull rope is connected to one end of the rear lifting slider, a rear reversing pulley for the second pull rope to be wound around and reversed is provided on the rear side of the weighing sensor, and a rear lifting slider reset spring is also connected to the rear lifting slider.

[0013] Furthermore, the drum is located at the lower side of the middle force transmission beam, the drum is located at the left side of the weighing sensor, the first pull rope is connected to the left end of the front lifting slider, and the second pull rope is connected to the left end of the rear lifting slider.

[0014] Furthermore, the front lifting slider return spring is a tension spring connected to the right end of the front lifting slider; the right lifting slider return spring is a tension spring connected to the right end of the rear lifting slider.

[0015] The beneficial effects of the present invention are as follows: in the present invention, in order to solve the problem of unbalanced loading that is easily caused by a single weight on one side of a weighing sensor in the prior art, a front weight and a rear weight are symmetrically arranged on the front and rear sides of the weighing sensor. When the weighing sensor needs to be calibrated, the weight driving mechanism drives the front weight and the rear weight to fall synchronously on the corresponding weight hanger, so that the weights at both ends of the front weight are respectively borne by the left force transmission beam and the right force transmission beam, and the weights at both ends of the rear weight are respectively borne by the left force transmission beam and the right force transmission beam. Since the left weight and the right weight are symmetrically arranged on the front and rear sides of the weighing sensor, the resultant force generated by the left weight and the right weight is in the same straight line as the weighing sensor, and no unbalanced loading is generated, thereby ensuring the accurate calibration of the weighing sensor.

[0016] Since the weight driving mechanism needs to drive the front weight and the rear weight to move synchronously, how to avoid the weighing sensor located in the middle position has become the focus of improvement of the weight driving mechanism. In the present invention, the front column and the rear column with an arc surface structure are used, which not only facilitates the guiding movement of the corresponding arc-shaped lifting slider to avoid the weighing sensor, but also adopts the corresponding reversing pulley and pull rope to avoid the weighing sensor, thereby ensuring the synchronous driving of the front weight and the rear weight by the weight driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of an embodiment of an anti-cheating electronic scale in the present invention; Figure 2 yes Figure 1 Schematic diagram of the state of the middle front weight when it is in an idle position; Figure 3 yes Figure 1 Schematic diagram of the state of the middle front weight when it is in the calibration station; Figure 4 yes Figure 1 Schematic diagram of the cooperation between the middle weight driving mechanism and the front lifting slider and the rear lifting slider; Figure 5 It is a schematic diagram of the cooperation between the front lifting slider and the front column in the present invention; 1. Base; 2. Left weight hanger; 3. Left force transmission beam; 4. Drum; 5. First pull rope; 6. Front weight; 7. Front guide rod; 8. Front lifting slider; 9. Front column; 10. Right weight frame; 11. Right force transmission beam; 12. Second pull rope; 13. Rear guide rod; 14. Rear weight; 15. Rear column; 16. Rear lifting slider; 17. Front lifting protrusion; 18. Front lifting slider transition slope; 19. Front weight protrusion; 20. Front lifting slider reset spring; 21. Front reversing pulley; 22. Rear reversing pulley; 23. Rear lifting protrusion; 24. Rear lifting slider reset spring; 25. Front guide groove; 26. Weighing sensor. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0019] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] An embodiment of the present invention of an anti-cheating electronic scale is as follows: Figures 1 to 5As shown: It includes a shell (not shown in the figure) and a base 1, a weighing sensor 26 is arranged on the base 1, a force transmission bracket is arranged on the upper side of the weighing sensor 26, a weighing pan (not shown in the figure) for placing objects is arranged on the upper side of the force transmission bracket, the force transmission bracket includes a left force transmission beam 3 extending in the front-to-back direction and a right force transmission beam 11 extending in the front-to-back direction, the force transmission bracket also includes a middle force transmission beam 27 connected between the left force transmission beam and the right force transmission beam and extending in the left-right direction, and the weighing sensor 26 is arranged on the lower side of the middle force transmission beam 27. All of the above belong to the prior art and will not be described in detail here.

[0021] The innovation of the present invention lies in that the anti-cheating electronic scale also includes a front weight 6 and a rear weight 14 symmetrically arranged on the front and rear sides of the weighing sensor, a left weight hanger 2 for cooperating with the left end of the front weight and the rear weight is provided on the left force transmission beam, a right weight hanger 10 for cooperating with the right end of the front weight and the rear weight is provided on the right force transmission beam, a weight driving mechanism for driving the front weight 6 and the rear weight 14 to rise and fall synchronously is provided on the base, and the front weight and the rear weight are driven by the weight driving mechanism to move downward and fall synchronously on the calibration station on the corresponding weight hanger and move upward and separate from the corresponding weight hanger. The left weight hanger and the right weight hanger are both C-shaped structures, and the left weight hanger and the right weight hanger can adopt the same weight hanger structure as the prior art, which will not be described in detail here.

[0022] The weight driving mechanism includes a front column 9 and a rear column 15 symmetrically arranged at the front and rear sides of the weighing sensor, the front column and the rear column are arranged vertically, and the bottoms of the front column and the rear column are fixed on the base. The front side surface of the front column and the rear side surface of the rear column are arc-shaped surfaces whose axes extend in the up-down direction, and the rear side surface of the front column and the front side surface of the rear column are planes perpendicular to the front-to-back direction.

[0023] The weight driving mechanism also includes a front lifting slider 8 rotatably mounted on the front side of the front column and a rear lifting slider 16 rotatably mounted on the rear side of the rear column. The front lifting slider can slide circumferentially along the front side of the front column, and the rear lifting slider can slide circumferentially along the rear side of the rear column. Specifically, a front guide groove 25 with a T-shaped cross section extending in the circumferential direction is provided on the front side of the front column, and the front lifting slider is guided and moved and assembled in the front guide groove 25; a rear guide groove with a T-shaped cross section extending in the circumferential direction is provided on the rear side of the rear column 15, and the rear lifting slider is guided and moved and assembled in the rear guide groove.

[0024] The front lifting slider 8 and the rear lifting slider 16 are both arc-shaped sliders arranged coaxially with the corresponding arc-shaped surfaces. A front lifting protrusion 17 is arranged on the top of the front lifting slider, and the left and right ends of the front lifting protrusion are connected to the front lifting slider through the front lifting slider transition slope 18, and a front weight protrusion 19 matching the front lifting protrusion is arranged at the bottom of the front weight; a rear lifting protrusion is arranged on the top of the rear lifting slider, and the left and right ends of the rear lifting protrusion 23 are connected to the rear lifting slider through the rear lifting slider transition slope, and a rear weight protrusion matching the rear lifting protrusion is arranged at the bottom of the rear weight.

[0025] Two front guide rods 7 arranged left and right are provided on the base at the front side of the weighing sensor, a front lifting slider 8 is located between the two front guide rods 7, and the front weight cooperates with the two front guide rods to guide and move in the up-down direction. Two rear guide rods 13 arranged left and right are provided on the base at the rear side of the weighing sensor, a rear lifting slider 16 is located between the two rear guide rods 13, and the rear weight 14 cooperates with the two rear guide rods to guide and move in the up-down direction.

[0026] The weight driving mechanism includes a drum 4 whose axis is driven by a motor and extends in the up-down direction, a first pull rope 5 and a second pull rope 12 are wound on the drum 4, the first pull rope 5 is connected to one end of the front lifting slider 8, a front reversing pulley 21 for the first pull rope 5 to be wound around for reversing is provided on the front side of the weighing sensor, and a front lifting slider reset spring 20 is also connected to the front lifting slider; the second pull rope 12 is connected to one end of the rear lifting slider 16, a rear reversing pulley 21 for the second pull rope 12 to be wound around for reversing is provided on the rear side of the weighing sensor, and a rear lifting slider reset spring 24 is also connected to the rear lifting slider. In this embodiment, there are two front reversing pulleys and two rear reversing pulleys, among which the reversing pulley close to the front lifting slider can change the direction of the first pull rope so that the force exerted by the first pull rope on the front lifting slider is consistent with the movement direction of the front lifting slider; the reversing pulley close to the rear lifting slider can change the direction of the second pull rope so that the force exerted by the second pull rope on the rear lifting slider is consistent with the movement direction of the rear lifting slider.

[0027] The drum is located at the lower side of the middle force transmission beam, and the drum is located at the left side of the weighing sensor. The first pull rope is connected to the left end of the front lifting slider, and the second pull rope is connected to the left end of the rear lifting slider. The front lifting slider reset spring 20 is a tension spring connected to the right end of the front lifting slider; the right lifting slider reset spring 24 is a tension spring connected to the right end of the rear lifting slider.

[0028] When the anti-cheating electronic scale is in normal use, the front weight and the rear weight are both in an idle position at a higher position, such as Figure 2As shown, at this time, the front lifting protrusion is in contact with the bottom of the front weight protrusion, and the rear lifting protrusion is in contact with the bottom of the rear weight protrusion. The two ends of the front weight are separated from the left weight hanger and the right weight hanger respectively, and the two ends of the rear weight are also separated from the corresponding left weight frame and the right weight frame. The distance between the bottom of the front weight and the corresponding weight frame is within 2cm, and the distance between the bottom of the rear weight and the corresponding weight frame is within 2cm. At this time, the force of the front weight and the rear weight will not act on the weighing sensor, and the electronic scale can be used normally. When the weighing sensor of the electronic scale needs to be calibrated, Figure 4 From the perspective, the drum rotates counterclockwise, the first pull rope and the second pull rope respectively pull the front lifting slider and the rear lifting slider to rotate synchronously relative to each other, the front lifting protrusion rotates away from the bottom of the front weight protrusion, and the rear lifting protrusion rotates away from the bottom of the rear weight protrusion. Under the action of gravity, the two ends of the front weight fall on the left weight hanger and the right weight hanger respectively, and the two ends of the rear weight fall on the corresponding left weight frame and the right weight hanger respectively. The combined force of the front weight and the rear weight is on the same axis as the weighing sensor, thereby realizing the calibration of the weighing sensor and avoiding vendors from cheating in adjusting the scale. After the calibration is completed, the corresponding reset springs reset the front lifting slider and the rear lifting slider.

[0029] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0030] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0031] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-cheating electronic scale, comprising a housing and a base, a weighing sensor is arranged on the base, a force transmission bracket is arranged on the upper side of the weighing sensor, a weighing pan for placing an object is arranged on the upper side of the force transmission bracket, the force transmission bracket comprises a left force transmission beam extending in the front-to-back direction and a right force transmission beam extending in the front-to-back direction, the force transmission bracket also comprises an intermediate force transmission beam connected between the left force transmission beam and the right force transmission beam and extending in the left-to-right direction, the weighing sensor is arranged on the lower side of the intermediate force transmission beam, and is characterized in that: The anti-cheating electronic scale also includes front weights and rear weights symmetrically arranged on the front and rear sides of the weighing sensor, a left weight hanger for cooperating with the left ends of the front weights and the rear weights is arranged on the left force transmission beam, a right weight hanger for cooperating with the right ends of the front weights and the rear weights is arranged on the right force transmission beam, a weight driving mechanism for driving the front weights and the rear weights to rise and fall synchronously is arranged on the base, the front weights and the rear weights are driven by the weight driving mechanism to move downward and fall synchronously on the corresponding weight hanger at a calibration station and move upward and separate from the corresponding weight hanger at an idle station.

2. The anti-cheating electronic scale according to claim 1, characterized in that: The weight driving mechanism includes a front column and a rear column symmetrically arranged on the front and rear sides of the weighing sensor, the front side surface of the front column and the rear side surface of the rear column are arc-shaped surfaces whose axes extend in the up-down direction, the rear side surface of the front column and the front side surface of the rear column are planes perpendicular to the front-to-back direction, the weight driving mechanism also includes a front lifting slider rotatably mounted on the front side surface of the front column and a rear lifting slider rotatably mounted on the rear side surface of the rear column, and the front lifting slider and the rear lifting slider are coaxial with the corresponding arc surfaces An arc-shaped slider is set, and a front lifting protrusion is set on the top of the front lifting slider, and the left and right ends of the front lifting protrusion are connected to the front lifting slider through the front lifting slider transition slope, and the bottom of the front weight is set with a front weight protrusion matching with the front lifting protrusion; a rear lifting protrusion is set on the top of the rear lifting slider, and the left and right ends of the rear lifting protrusion are connected to the rear lifting slider through the rear lifting slider transition slope, and the bottom of the rear weight is set with a rear weight protrusion matching with the rear lifting protrusion.

3. The anti-cheating electronic scale according to claim 2, characterized in that: Two front guide rods arranged left and right are arranged on the base at the front side of the weighing sensor, the front lifting slide block is located between the two front guide rods, and the front weight cooperates with the two front guide rods in guiding movement.

4. The anti-cheating electronic scale according to claim 2, characterized in that: Two rear guide rods arranged left and right are arranged on the base at the rear side of the weighing sensor, the rear lifting slide block is located between the two rear guide rods, and the rear weight is guided and moved in coordination with the two rear guide rods.

5. The anti-cheating electronic scale according to any one of claims 2 to 4, characterized in that: The weight driving mechanism includes a drum whose axis is driven by a motor and extends in the up-down direction, a first pull rope and a second pull rope are wound on the drum, the first pull rope is connected to one end of the front lifting slider, a front reversing pulley for the first pull rope to be wound around and reversed is provided on the front side of the weighing sensor, and a front lifting slider reset spring is also connected to the front lifting slider; the second pull rope is connected to one end of the rear lifting slider, a rear reversing pulley for the second pull rope to be wound around and reversed is provided on the rear side of the weighing sensor, and a rear lifting slider reset spring is also connected to the rear lifting slider.

6. The anti-cheating electronic scale according to claim 5, characterized in that: The drum is located at the lower side of the middle force transmission beam, the drum is located at the left side of the weighing sensor, the first pull rope is connected to the left end of the front lifting slider, and the second pull rope is connected to the left end of the rear lifting slider.

7. The anti-cheating electronic scale according to claim 6, characterized in that: The front lifting slider return spring is a tension spring connected to the right end of the front lifting slider; the right lifting slider return spring is a tension spring connected to the right end of the rear lifting slider.

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