A high-precision double-table dynamic scale

Abstract

The present invention discloses a high-precision dual-table dynamic scale, comprising a mounting base, a scale A conveying platform, and a scale B conveying platform. The scale A conveying platform and the scale B conveying platform are both arranged on the top of the mounting base, coplanar with each other, and spaced apart from each other between the rear end of the scale A conveying platform and the front end of the scale B conveying platform. The top surface of the mounting base is provided with weighing sensors at the front and rear ends of the scales A and B conveying platforms, respectively. The fixed ends of the weighing sensors are connected to the top surface of the mounting base, and the loading ends are connected to the front and rear ends of the scales A and B conveying platforms. Both sides of the rear end of the scale A conveying platform are connected to the loading ends of the weighing sensors located on both sides of the rear end of the scale B conveying platform using special-shaped connectors of the scale A, while both sides of the front end of the scale B conveying platform are connected to the loading ends of the weighing sensors located on both sides of the rear end of the scale A conveying platform using special-shaped connectors of the scale B. This improves the stability of the equipment and the weighing accuracy of the dual-table dynamic scale.

Description

Technical Field

[0001] The invention belongs to the field of logistics automation and relates to a high-precision double-table dynamic scale. Background Art

[0002] High throughput efficiency is a new trend in the development of dynamic DWS systems. The performance of dynamic scales is a key factor restricting the efficiency improvement of DWS systems. In order to meet the industry's demand for express sorting efficiency, and for compatible application scenarios where package lengths vary randomly, dual-table dynamic scales have more advantages in efficiency than single-table dynamic scales. Three weighing modes can be used: A-scale weighing, B-scale weighing, and A+B-scale weighing. Different weighing modes are used for packages of different lengths, which can effectively improve package weighing efficiency. Usually, in order to match the proportion of packages of different lengths, a combination of long and short scales is used. Short packages are weighed by the shorter scale, and medium-length packages are weighed by the longer scale. For weighing, a longer platform is used, and long packages are weighed on a combination platform consisting of a long and short platform, which corresponds to the three weighing modes mentioned above. However, this dual-platform structure also brings some problems. Since the support points of the short platform sensor are more concentrated, the stability of the platform is deteriorated. In the A+B weighing mode, the weighing data is the sum of the weights of the A and B platforms. However, since the A+B platforms cannot be calibrated separately, the weighing accuracy in the A+B weighing mode is reduced. In addition, when the package length is at the package length dividing point, due to the error in length measurement, packages of the same length may be in different weighing modes during repeated accuracy tests, resulting in a decrease in repeated weighing accuracy. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a high-precision dual-table dynamic scale, which not only ensures high currency efficiency and improves the stability of the equipment, but also improves the weighing accuracy of the dual-table dynamic scale.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-precision dual-table dynamic scale, comprising a mounting base, an A-scale conveying platform, and a B-scale conveying platform;

[0006] The conveying platform of scale A and scale B are both installed on the top of the installation base. The conveying platform of scale A and scale B are coplanar, and a gap is set between the rear end of the conveying platform of scale A and the front end of the conveying platform of scale B.

[0007] A weighing sensor is provided on the top surface of the mounting base at both sides of the front end of the A scale conveyor platform, both sides of the rear end of the A scale conveyor platform, both sides of the front end of the B scale conveyor platform, and both sides of the rear end of the B scale conveyor platform. The fixed ends of the weighing sensors are connected to the top surface of the mounting base, and the front ends of the A scale conveyor platform and the rear ends of the B scale conveyor platform are connected to the loading ends of the weighing sensors at the corresponding positions.

[0008] Both sides of the rear end of the A scale conveyor platform are connected to the loading ends of the weighing sensors located on both sides of the rear end of the B scale conveyor platform using the A scale special-shaped connector. Both sides of the front end of the B scale conveyor platform are connected to the loading ends of the weighing sensors located on both sides of the rear end of the A scale conveyor platform using the B scale special-shaped connector. Both the A scale special-shaped connector and the B scale special-shaped connector include two horizontal plates and one inclined plate, one of the horizontal plates is connected to both sides of the rear end of the A scale conveyor platform or both sides of the front end of the B scale conveyor platform, the other horizontal plate is connected to the loading ends of the weighing sensors, and both ends of the inclined plate are connected to the two horizontal plates.

[0009] Preferably, the weighing sensors are located on the sides of the A-scale conveying platform and the B-scale conveying platform.

[0010] Furthermore, in the A scale special-shaped connector and the B scale special-shaped connector, the horizontal plate connected to the weighing sensor is higher than the other horizontal plate.

[0011] Furthermore, a through hole is provided on the A-scale special-shaped connector or the B-scale special-shaped connector, and the A-scale special-shaped connector and the B-scale special-shaped connector are arranged to be interlaced through the through hole.

[0012] Furthermore, upper connecting plates of the weighing sensors are horizontally extended to both sides of the front end of the A scale conveying platform and the rear end of the B scale conveying platform, and the upper connecting plates of the weighing sensors are connected to the loading ends of the weighing sensors at corresponding positions.

[0013] Preferably, photoelectric sensors are provided at both the front and rear ends of the A scale conveying platform and the front and rear ends of the B scale conveying platform.

[0014] Preferably, two junction boxes are provided on the mounting base, and the input ends of the two junction boxes are respectively connected to the output ends of the weighing sensors corresponding to the A scale conveying platform and the B scale conveying platform.

[0015] Preferably, both the A-scale conveying platform and the B-scale conveying platform adopt belt conveying devices.

[0016] Preferably, the four corners of the bottom of the mounting base are each provided with an adjusting shoe angle.

[0017] Preferably, a spacer is provided between the fixed end of the weighing sensor and the mounting base.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention interchanges the sensor positions at the rear end of the A scale conveyor platform and the front end of the B scale conveyor platform. On the one hand, it avoids the problem of loss of weighing accuracy caused by the connection part of the original series weighing platform exceeding the effective weighing platform area. When collecting data in the A scale weighing mode, the entire package is always within the effective weighing platform area, avoiding the risk of low accuracy of data collected at the extended end of the A scale platform in the prior art, which causes reduced weighing accuracy. In the process of entering the B scale conveyor platform and gradually leaving the A scale conveyor platform, the package in the A+B scale weighing mode is within the effective area of ​​the A scale conveyor platform and the B scale conveyor platform, thereby improving the weighing repeatability accuracy in the A+B weighing mode. On the other hand, it improves the stability of the weighing platform structure. While keeping the overall size unchanged, it increases the effective weighing area of ​​the A scale conveyor platform and the B scale conveyor platform, thereby improving the weighing accuracy of the equipment.

[0020] Furthermore, the load cell and force transmission member are offset to the side, keeping the center of mass of the weighing platform and the axis of the load cell in the same plane. This improves dynamic stability, reduces the additional bending and torque exerted on the sensor's elastic body during package conveyance, and effectively controls the equivalent off-center load effect. This also facilitates installation, alignment, adjustment, and maintenance, improving the equipment's manufacturability and maintainability.

[0021] Furthermore, the special-shaped connectors of scale A and scale B are arranged alternately through the through holes, and the overall structure is compact and lightweight, so that the conveying platform of scale A and scale B are physically independent of each other without mechanical interference.

[0022] Furthermore, the height can be adjusted by rotating the hoof so that it can be consistent with the height of the front and rear equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the high-precision dual-table dynamic scale of the present invention;

[0024] Figure 2 It is a schematic diagram of the arrangement of the weighing sensor of the present invention;

[0025] Figure 3 This is a schematic structural diagram of the special-shaped connector of scale A of the present invention;

[0026] Figure 4 This is a schematic structural diagram of the special-shaped connector of the B scale of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection between the A scale special-shaped connector and the B scale special-shaped connector of the present invention.

[0028] Including: 1. Mounting base, 2. Adjusting shoe angle, 3. Servo motor, 4. Synchronous belt, 5. A scale inlet photoelectric device, 6. A scale conveyor platform, 7. A scale outlet photoelectric device, 8. B scale outlet photoelectric device, 9. B scale conveyor platform, 10. Weighing sensor upper connecting plate, 11. Weighing sensor, 12. A scale special-shaped connecting piece, 13. B scale special-shaped connecting piece, 14. Junction box. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figure 1 As shown, the high-precision dual-table dynamic scale of the present invention includes a mounting base 1, an A-scale conveying platform 6 and a B-scale conveying platform 9.

[0033] The A-scale conveying platform 6 and the B-scale conveying platform 9 are both arranged on the top of the installation base 1 , the A-scale conveying platform 6 and the B-scale conveying platform 9 are coplanar, and a gap is set between the rear end of the A-scale conveying platform 6 and the front end of the B-scale conveying platform 9 .

[0034] Both scale A conveyor platform 6 and scale B conveyor platform 9 utilize a belt conveyor system. Each comprises a servo motor 3, a timing belt 4, a driving roller, a driven roller, and a conveyor belt. The output of the servo motor 3 is connected to the driving roller via the timing belt 4, and the driven roller is connected to the driving roller via the conveyor belt. The entire system is powered by the servo motor 3, which drives the timing belt 4 to rotate the driving roller, driven roller, and conveyor belt, thereby conveying packages.

[0035] A weighing sensor 11 is provided on the top surface of the mounting base 1 at both sides of the front end of the A scale conveyor platform 6, both sides of the rear end of the A scale conveyor platform 6, both sides of the front end of the B scale conveyor platform 9 and both sides of the rear end of the B scale conveyor platform 9. The fixed end of the weighing sensor 11 is connected to the top surface of the mounting base 1, and the front ends of the A scale conveyor platform 6 and the rear ends of the B scale conveyor platform 9 are respectively connected to the loading ends of the weighing sensors 11 at corresponding positions.

[0036] like Figure 2 As shown, both sides of the rear end of the A scale conveyor platform 6 are connected to the loading ends of the weighing sensors 11 located on both sides of the rear end of the B scale conveyor platform 9 using the A scale special-shaped connector 12, and both sides of the front end of the B scale conveyor platform 9 are connected to the loading ends of the weighing sensors 11 located on both sides of the rear end of the A scale conveyor platform 6 using the B scale special-shaped connector 13. Figure 2 The hollow circle represents the weighing sensor 11 connected to the A scale conveyor platform 6, and the solid circle represents the weighing sensor 11 connected to the B scale conveyor platform 9, which increases the effective weighing area of ​​the A scale conveyor platform 6 and the B scale conveyor platform 9 and improves the weighing accuracy of the equipment.

[0037] like Figure 3 and Figure 4 As shown, the A scale special-shaped connecting member 12 and the B scale special-shaped connecting member 13 each include two horizontal plates and one inclined plate, wherein one horizontal plate is connected to both sides of the rear end of the A scale conveyor platform 6 or both sides of the front end of the B scale conveyor platform 9, the other horizontal plate is connected to the loading end of the weighing sensor 11, and both ends of the inclined plate are connected to the two horizontal plates.

[0038] In the prior art, the weighing sensor 11 is generally placed at the bottom of the conveying platform. In this application, the weighing sensor 11 is set on the side of the A scale conveying platform 6 and the B scale conveying platform 9.

[0039] like Figure 5 As shown, the horizontal plate connected to the load cell 11 in the A-scale and B-scale special-shaped connectors 12 and 13 is higher than the other horizontal plate. The lower horizontal plate is connected to the sides of the A-scale conveyor platform 6 and the B-scale conveyor platform 9 using a 90-degree angle joint. Connecting screws are arranged on both sides to ensure the rigidity of the connection. Furthermore, through-holes are provided in the A-scale special-shaped connector 12 or the B-scale special-shaped connector 13, through which the A-scale special-shaped connector 12 and the B-scale special-shaped connector 13 are interlaced. In this embodiment, a through-hole is provided in the B-scale special-shaped connector 13, through which the A-scale special-shaped connector 12 passes.

[0040] Weighing sensor upper connecting plates 10 extend horizontally to both sides of the front end of the A scale conveying platform 6 and the rear end of the B scale conveying platform 9, and the weighing sensor upper connecting plates 10 are connected to the loading ends of the weighing sensors 11 at corresponding positions.

[0041] A spacer is provided between the fixed end of the weighing sensor 11 and the mounting base 1 , and the loading end of the weighing sensor 11 is connected to the cross plate and the upper connecting plate 10 of the weighing sensor by using a ball joint connector.

[0042] Photoelectric sensors are provided at both ends of the A scale conveyor platform 6 and the B scale conveyor platform 9. Photoelectric sensors are provided on both sides of each end, one side is the transmitting end of the photoelectric sensor, and the other side is the receiving end of the photoelectric sensor.

[0043] Two junction boxes 14 are provided on the mounting base 1 , and input ends of the two junction boxes 14 are connected to output ends of the weighing sensors 11 corresponding to the A scale conveying platform 6 and the B scale conveying platform 9 respectively.

[0044] The four corners at the bottom of the mounting base 1 are each provided with an adjusting shoe angle 2.

[0045] In the present invention, the height can be adjusted by rotating the hoof foot 2 so that it can be consistent with the height of the front and rear equipment. In the present invention, the weighing sensor 11 and its force transmission component are offset from the bottom of the weighing conveyor platform to the side, which is convenient for installation, alignment, adjustment and maintenance, and improves the manufacturability and maintainability of the equipment. At the same time, the center of mass of the weighing conveyor platform and the axis of the weighing sensor 11 are kept in the same plane, which improves the dynamic stability, reduces the additional bending moment and torque exerted on the elastomer in the weighing sensor 11 during package transportation, and effectively controls the equivalent overload effect.

[0046] In the present invention, the effective weighing areas of the two weighing conveying platforms are spatially overlapped by the A-scale special-shaped connector 12 and the B-scale special-shaped connector 13, so that the packages in the A+B weighing mode are all within the effective areas of the A-scale conveying platform 6 and the B-scale conveying platform 9 during the process of entering the B-scale and gradually leaving the A-scale, thereby improving the accuracy of the weighing data in this process and effectively improving the weighing precision in the A+B mode.

[0047] The function of the junction box 14 in the present invention is to compensate for the output error of each weighing sensor 11 and the error caused by the different deformation of the weighing platform, thereby ensuring the consistency of the output of each weighing sensor 11 and further improving the weighing accuracy.

[0048] The principle of dynamic weighing in the present invention is that the package enters the A scale conveyor platform 6 of the equipment through the front conveyor, and the weight of the package is transmitted to the weighing sensor 11 through the connecting plate 10 and its accessories on the weighing sensor on the A scale conveyor platform 6. When the package enters the equipment, it will trigger the A scale entry photoelectric sensor 5. The length of the package is judged by the time the package blocks the A scale entry photoelectric sensor 5, and the weighing mode is selected according to the length of the package. If the longest length of the package is less than the maximum length of the weighable package of the B scale conveyor platform 9, the package will be weighed on the B scale conveyor platform 9. If the length of the package is greater than the maximum length of the weighable package of the B scale conveyor platform 9 and less than the maximum length of the weighable package of the A scale conveyor platform 6, the package will be weighed on the A scale conveyor platform 6. If the length of the package is greater than the maximum length of the weighable package of the A scale conveyor platform 6, the package will be weighed on both the A scale conveyor platform 6 and the B scale conveyor platform 9.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] It should be understood that the above description is for illustrative purposes only and is not intended to be limiting. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A high-precision dual-table dynamic scale, characterized in that: It includes a mounting base (1), an A-scale conveying platform (6), and a B-scale conveying platform (9); The A scale conveying platform (6) and the B scale conveying platform (9) are both arranged on the top of the mounting base (1), the A scale conveying platform (6) and the B scale conveying platform (9) are coplanar, and a gap is set between the rear end of the A scale conveying platform (6) and the front end of the B scale conveying platform (9); A weighing sensor (11) is provided on the top surface of the mounting base (1) at positions on both sides of the front end of the A scale conveying platform (6), both sides of the rear end of the A scale conveying platform (6), both sides of the front end of the B scale conveying platform (9), and both sides of the rear end of the B scale conveying platform (9). The fixed end of the weighing sensor (11) is connected to the top surface of the mounting base (1), and both sides of the front end of the A scale conveying platform (6) and both sides of the rear end of the B scale conveying platform (9) are respectively connected to the loading ends of the weighing sensors (11) at corresponding positions. Both sides of the rear end of the A scale conveyor platform (6) are connected to the loading ends of the weighing sensor (11) located on both sides of the front end of the B scale conveyor platform (9) using the A scale special-shaped connector (12), and both sides of the front end of the B scale conveyor platform (9) are connected to the loading ends of the weighing sensor (11) located on both sides of the rear end of the A scale conveyor platform (6) using the B scale special-shaped connector (13); the A scale special-shaped connector (12) and the B scale special-shaped connector (13) each include two horizontal plates and one inclined plate, one of the horizontal plates is connected to both sides of the rear end of the A scale conveyor platform (6) or both sides of the front end of the B scale conveyor platform (9), the other horizontal plate is connected to the loading ends of the weighing sensor (11), and both ends of the inclined plate are connected to the two horizontal plates; The weighing sensors (11) are both located on the sides of the A scale conveyor platform (6) and the B scale conveyor platform (9); The A scale conveying platform (6) and the B scale conveying platform (9) both use belt conveying devices.

2. The high-precision dual-table dynamic scale according to claim 1, characterized in that: In the A scale special-shaped connecting piece (12) and the B scale special-shaped connecting piece (13), the horizontal plate connected to the weighing sensor (11) is higher than the other horizontal plate.

3. The high-precision dual-table dynamic scale according to claim 2, characterized in that: A through hole is provided on the A-scale special-shaped connecting piece (12) or the B-scale special-shaped connecting piece (13), and the A-scale special-shaped connecting piece (12) and the B-scale special-shaped connecting piece (13) are arranged to be interlaced through the through hole.

4. The high-precision dual-table dynamic scale according to claim 1, characterized in that: Both sides of the front end of the A scale conveying platform (6) and both sides of the rear end of the B scale conveying platform (9) are horizontally extended to both sides. The upper connecting plates (10) of the weighing sensors are connected to the loading ends of the weighing sensors (11) at corresponding positions.

5. The high-precision dual-table dynamic scale according to claim 1, characterized in that: Photoelectric sensors are provided at both the front and rear ends of the A scale conveying platform (6) and the front and rear ends of the B scale conveying platform (9).

6. The high-precision dual-table dynamic scale according to claim 1, characterized in that: Two junction boxes (14) are provided on the mounting base (1), and the input ends of the two junction boxes (14) are respectively connected to the output ends of the weighing sensors (11) corresponding to the A scale conveying platform (6) and the B scale conveying platform (9).

7. The high-precision dual-table dynamic scale according to claim 1, characterized in that: The four corners at the bottom of the mounting base (1) are all provided with adjusting shoe angles (2).

8. The high-precision dual-table dynamic scale according to claim 1, characterized in that: A spacer is provided between the fixed end of the weighing sensor (11) and the mounting base (1).

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