Micro-metering electronic scale

Abstract

This application relates to a miniature weighing electronic scale. The miniature weighing electronic scale includes: a belt, a drive roller assembly, a driven roller assembly, a weighing platform assembly, a power unit, and a feeding assembly. In actual use, the material is conveyed from upstream to the belt above the drive roller assembly. The drive roller assembly drives the belt to rotate, and the belt conveys the material to the weighing platform assembly, where it is weighed for both weight and flow rate. The material is then conveyed through the driven roller assembly to the feeding assembly, and finally transported downstream or to a box through the feeding port of the cover. After the material falls from the belt, the belt rotates back from below the drive roller assembly, the weighing platform assembly, and the driven roller assembly. A scraper assembly comes into contact with the belt, scraping off fine powder or material filaments adhering to the belt, ensuring the cleanliness of the belt surface receiving the upstream material and thus guaranteeing accurate weighing measurements.

Description

Technical Field

[0001] This application relates to the field of electronic belt scale technology, and in particular to miniature measuring electronic scales. Background Technology

[0002] An electronic belt scale consists of a load-bearing device, a load cell, a speed sensor, and a weighing display. During weighing, the load-bearing device transmits the weight of the material on the belt to the load cell, which outputs a voltage (mV) signal proportional to the weight of the material. This signal is amplified and converted into a digital signal (A) by an analog-to-digital converter, then sent to the arithmetic unit. The material speed is input to the speed sensor, which outputs a pulse count (B), also sent to the arithmetic unit. The arithmetic unit calculates the amount of material in that measurement cycle by analyzing A and B. By accumulating the data for each measurement cycle, the total amount of material continuously passing through the belt can be obtained.

[0003] In the operation of electronic belt scales, the tension of the belt has a significant impact on the accuracy of the scale. Generally, the position of the driven roller is determined before the belt is installed. However, if the driven roller position is determined beforehand, it is difficult to install the belt. Once the belt is installed, the position of the driven roller is inconvenient to move, and the installation position of the load cell is not fixed, making it prone to movement with the belt as it rotates. Electronic belt scales are important auxiliary equipment in workshops, controlling the movement of the belt via a motor to transport materials and monitor the flow rate during the transport process. However, in existing electronic belt scales, after transporting fibrous or powdery materials to downstream processes, trace amounts of material adhere to the belt surface, affecting measurement accuracy. Utility Model Content

[0004] Therefore, it is necessary to provide a miniature electronic weighing scale to address the problem that trace amounts of material adhere to the surface of the belt after the existing electronic belt scales transport fibrous or powdery materials to the downstream process, which affects the measurement accuracy.

[0005] A miniature measuring electronic scale, the miniature measuring electronic scale comprising:

[0006] A miniature weighing electronic scale includes: a belt, a driving roller assembly, a driven roller assembly, a weighing platform assembly, a power unit, and a feeding assembly;

[0007] The active roller assembly, the weighing platform assembly, and the driven roller assembly are arranged at intervals along a first direction; the belt is sleeved on the active roller assembly, the weighing platform assembly, and the driven roller assembly; the power unit is connected to the active roller assembly so that the active roller assembly drives the belt to rotate, and the first direction is the conveying direction of the belt;

[0008] The feeding assembly is located on the side of the driven roller assembly away from the weighing platform assembly. The feeding assembly includes a cover and a scraper assembly. The cover covers the belt and has a feeding port. The scraper assembly is located on the cover and abuts against the outer side of the belt located below the driven roller assembly.

[0009] In one embodiment, the scraper assembly includes: a scraper strip, a scraper blade, and a soft strip;

[0010] The scraper strip, the brush strip, and the soft leather strip are all connected to the cover. The scraper strip, the brush strip, and the soft leather strip are arranged sequentially along the first direction and all abut against the outer side of the belt located below the driven roller assembly.

[0011] In one embodiment, the feeding assembly further includes two abutment plates connected to the cover;

[0012] The two abutment plates are located on both sides of the belt conveying direction and abut against the belt. The abutment plates are provided with arc-shaped grooves, and the arc-shaped grooves are adapted to the shape of the end of the driven roller assembly that is away from the weighing platform roller assembly. The scraper assembly is located between the two abutment plates.

[0013] In one embodiment, the scraper assembly further includes two sliding portions;

[0014] The two sliding parts are located on both sides of the belt conveying direction and connected to the cover. The two sliding parts correspond one-to-one with the two abutment plates. The abutment plates and the corresponding sliding parts slide in the first direction. The two ends of the scraper assembly are connected to the two abutment plates respectively. The abutment plates drive the scraper assembly to move closer to or away from the belt in the first direction.

[0015] In one embodiment, the miniature weighing scale further includes a protective cover and a cover plate. The protective cover is disposed above the weighing platform assembly, and the belt is located between the protective cover and the weighing platform assembly. The protective cover has a weight hole, and the cover plate is connected to the protective cover and can cover or open the weight hole.

[0016] In one embodiment, the miniature measuring scale also includes a moisture meter;

[0017] The top of the protective cover has a through hole, through which the moisture meter is inserted and connected to the cover body, with the moisture meter facing the belt.

[0018] In one embodiment, the weighing platform assembly includes: two first support rods, multiple first crossbeams, multiple metering rollers, and multiple sets of weight sensors;

[0019] Two first support rods are spaced apart in a direction perpendicular to the first direction and extend along the first direction; a plurality of first crossbeams are spaced apart in the first direction, and the two ends of the first crossbeams are respectively connected to the two first support rods.

[0020] Multiple sets of weight sensors are arranged at intervals along the first direction. Each set of weight sensors includes a first sensor and a second sensor. The first sensor and the second sensor are respectively disposed on the top of the two first support rods. Multiple metering rollers and multiple sets of weight sensors correspond one-to-one. The two ends of the metering rollers are rotatably connected to the corresponding first sensor and second sensor, respectively. The metering rollers are used to support the belt.

[0021] In one embodiment, the active roller assembly includes two second support rods, a second crossbeam, a receiving guide plate, and a first roller;

[0022] Two second support rods are spaced apart along a direction perpendicular to the first direction and extend along the first direction. A second crossbeam, a receiving guide plate, and a first roller are arranged in sequence along the first direction. The first roller is located on the side of the receiving guide plate away from the feeding assembly and tensions the belt. The receiving guide plate is connected to the two second support rods and receives the belt. Both ends of the second crossbeam are connected to the two second support rods. Both ends of the first roller are rotatably connected to the two second support rods respectively.

[0023] In one embodiment, the driven roller assembly includes: two third support rods, a third crossbeam, a tensioning roller group, and a second roller;

[0024] The two third support rods are spaced apart along a direction perpendicular to the first direction and extend along the first direction. The tensioning roller group, the third crossbeam and the second roller are arranged in sequence spaced apart along the first direction. The first roller is located on the side of the third crossbeam away from the weighing platform assembly and tensions the belt.

[0025] The tensioning roller assembly includes two connecting plates and a tensioning roller. The two connecting plates are rotatably connected to the two third support rods about the axis of the second direction. The two ends of the tensioning roller are rotatably connected to the two connecting plates. The two ends of the second roller are rotatably connected to the two third support rods. The second direction is the width direction of the belt.

[0026] In one embodiment, the miniature weighing scale further includes an automatic correction device, which includes: two fourth support rods, a fourth crossbeam, a third roller, and two clamping assemblies;

[0027] The two fourth support rods are spaced apart in a direction perpendicular to the first direction and extend along the first direction. The two ends of the fourth crossbeam are respectively connected to the two fourth support rods, and the two ends of the third roller are respectively rotatably connected to the two ends of the two fourth support rods.

[0028] Two clamping components are respectively mounted on two fourth support rods. The two clamping components clamp the upper and lower surfaces of the belt on both sides along the second direction. The belt moves relative to the clamping components along the first direction, where the second direction is the width direction of the belt. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a miniature electronic scale according to an embodiment.

[0030] Figure 2 for Figure 1 Another perspective view.

[0031] Figure 3 for Figure 2 Enlarged view of the feeding and unloading assembly.

[0032] Figure 4 for Figure 2 Enlarged view of the middle protective cover.

[0033] Figure 5 for Figure 2 Enlarged view of the weighing platform components.

[0034] Figure 6 for Figure 2 Enlarged view of the central active roller assembly.

[0035] Figure 7 for Figure 2 Enlarged view of the driven roller assembly.

[0036] Figure 8 for Figure 2 Enlarged view of the middle feeder assembly.

[0037] Figure 9 for Figure 2 Enlarged view of the automatic correction device in the middle.

[0038] Explanation of icon numbers:

[0039] 10-Miniature Measuring Electronic Scale;

[0040] 100-Belt;

[0041] 200-Active roller assembly; 210-Second support rod; 220-Second crossbeam; 230-Receiving guide plate; 240-First roller; 250-Active correction assembly; 251-Adjusting block; 252-Adjusting component; 253-Adjusting roller;

[0042] 300-Driven roller assembly; 310-Third support rod; 320-Third crossbeam; 330-Tension roller group; 331-Connecting plate; 332-Tension roller; 340-Second roller;

[0043] 400 - Weighing platform assembly; 410 - First support rod; 420 - First crossbeam; 430 - Measuring roller; 440 - Weight sensor; 450 - Sensor bracket; 460 - Amplifier; 470 - Adjusting bolt;

[0044] 500 - Power Unit;

[0045] 600 - Feeding assembly; 610 - Cover; 610a - Feeding port; 620 - Scraper assembly; 621 - Scraper strip; 622 - Scraper strip; 623 - Soft strip; 624 - Abutment plate; 624a - Arc groove; 625 - Sliding part;

[0046] 700-Protective cover; 701-Weight hole; 702-Through hole; 710-Cover plate; 720-Moisture meter; 730-Cover plate; 740-Blocking assembly; 741-Blocking frame; 742-Blocking strip; 743-First enclosure strip; 744-Second enclosure strip; 750-Support frame; 760-Supporting frame;

[0047] 800 - Automatic alignment device; 810 - Fourth support rod; 820 - Fourth crossbeam; 830 - Third roller; 840 - Clamping assembly; 841 - Connecting piece; 842 - Clamping piece; 843 - Limit bearing; 850 - Rotating shaft; 860 - Rotating bearing;

[0048] OX - First direction; OY - Second direction. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] See Figure 1 , Figure 1 A schematic diagram of the structure of a miniature measuring electronic scale 10 according to an embodiment of this application is shown. (See attached diagram.) Figure 1 and Figure 2 The miniature weighing electronic scale 10 provided in one embodiment of this application includes: a belt 100, a driving roller assembly 200, a driven roller assembly 300, a weighing platform assembly 400, a power unit 500, and a feeding assembly 600.

[0056] In the aforementioned miniature weighing electronic scale 10, the active roller assembly 200, the weighing platform assembly 400, and the driven roller assembly 300 are arranged sequentially at intervals along the first direction OX. A belt 100 is fitted onto the active roller assembly 200, the weighing platform assembly 400, and the driven roller assembly 300. A power unit 500 is connected to the active roller assembly 200 to drive the belt 100 to rotate; the first direction OX is the transmission direction of the belt 100. (See reference...) Figure 3 The feeding assembly 600 is located on the side of the driven roller assembly 300 away from the weighing platform assembly 400. The feeding assembly 600 includes a cover 610 and a scraper assembly 620. The cover 610 covers the belt 100 and has a feeding port 610a. The scraper assembly 620 is located on the cover 610 and abuts against the outer side of the belt 100 located below the driven roller assembly 300.

[0057] In actual use, the aforementioned miniature weighing scale 10 is used to transfer materials from upstream to the belt 100 above the drive roller assembly 200. Generally, the upstream conveying assembly is higher than the miniature weighing scale 10 of this application. The drive roller assembly 200 drives the belt 100 to rotate, and the belt 100 transfers the materials to the weighing platform assembly 400. The weighing platform assembly 400 performs weight and flow rate weighing, and then the materials are conveyed through the driven roller assembly 300 to the unloading assembly 600. The materials are then conveyed downstream or boxed through the unloading port 610a of the cover 610. After the materials fall from the belt 100, the belt 100 rotates from the bottom of the drive roller assembly 200, the weighing platform assembly 400, and the driven roller assembly 300. The scraper assembly 620 comes into contact with the belt 100, thereby scraping off the fine powder or material filaments adhering to the belt 100, ensuring that the surface of the belt 100 receiving the upstream material is clean, thus ensuring accurate weighing measurement.

[0058] See Figure 2 and Figure 3 In one embodiment, the scraper assembly 620 includes a scraper strip 621, a scraper blade 622, and a soft leather strip 623. The scraper blade 622, scraper strip 621, and soft leather strip 623 are all connected to the cover 610. The scraper blade 622, scraper strip 621, and soft leather strip 623 are arranged sequentially along the first direction OX and all abut against the outer surface of the belt 100 located below the driven roller assembly 300.

[0059] In this embodiment, a scraper strip 622 coarsely scrapes off the material powder adhering to the surface of the belt 100, a scraper brush strip 621 performs fine scraping, and a soft leather strip 623 elastically abuts against the belt 100 to isolate dust. The scraper can be a hard plate or a strip, the scraper brush strip 621 can be a bristle brush or a soft brush, and the soft leather strip 623 is made of rubber or leather, achieving dust isolation through elastic abutment.

[0060] See Figure 2 and Figure 3 In one embodiment, the feeding assembly 600 further includes two abutment plates 624 connected to the cover 610. The two abutment plates 624 are located on opposite sides of the conveyor belt 100 in the conveying direction and abut against the belt 100. Each abutment plate 624 has an arc-shaped groove 624a, which is adapted to the shape of the driven roller assembly 300 opposite to the weighing platform roller assembly. The scraper assembly 620 is located between the two abutment plates 624. Thus, by adapting the arc-shaped groove 624a of the abutment plate 624 to the shape of the belt 100 supported by the driven roller assembly 300, external space is isolated, preventing dust from entering the interior of the miniature weighing electronic scale 10.

[0061] Preferably, the miniature weighing electronic scale 10 is covered with a cover plate 730 on both sides, thereby covering the belt 100, the driving roller assembly 200, the driven roller assembly 300, the weighing platform assembly 400, and the power unit 500, thereby preventing dust from entering the interior of the miniature weighing electronic scale 10.

[0062] See Figure 1 , Figure 2 as well as Figure 8 Preferably, a baffle assembly 740 is also provided above the active roller assembly 200. The baffle assembly 740 includes a baffle frame 741 and two baffle strips 742. The baffle frame 741 is surrounded by two first enclosure strips 743 and two second enclosure strips 744. The two baffle strips 742 are respectively connected to the two first enclosure strips 743. Both the first enclosure strips 743 and the baffle strips 742 extend along the first direction OX. The baffle strips 742 are located on the side of the first enclosure strips 743 away from the discharge assembly. The length of the baffle strips 742 is less than that of the first enclosure strips 743.

[0063] Specifically, the miniature weighing scale 10 includes a support frame 750 and a support frame 760. The support frame 750 is connected to the support frame 760. The belt 100, the driving roller assembly 200, the driven roller assembly 300, the weighing platform assembly 400, the power unit 500, and the unloading assembly 600 are all housed within the support frame 760. This allows the miniature weighing scale 10 to be positioned for installation or transported.

[0064] The miniature weighing scale 10 of this application adopts a square tube support frame 750, which significantly improves strength and stability. Finite element analysis results show that the maximum stress under normal load is 2.59 MPa, which is much lower than the yield strength of the cold-rolled square tube material of 235 MPa. The maximum deformation does not exceed 0.104 mm, ensuring the overall stability of the scale frame.

[0065] See Figure 2 and Figure 3 In one embodiment, the scraper assembly 620 further includes two sliding portions 625. The two sliding portions 625 are located on opposite sides of the conveyor belt 100 in the conveying direction and are connected to the cover 610. Each sliding portion 625 corresponds to one of the two abutment plates 624. The abutment plates 624 and their corresponding sliding portions 625 slide in a first direction OX. Both ends of the scraper assembly 620 are connected to the two abutment plates 624. The abutment plates 624 move the scraper assembly 620 closer to or further away from the belt 100 along the first direction OX, thereby adjusting the degree of contact and distance between the scraper assembly 620 and the belt 100. This allows it to be applied to materials of different coarseness, improving scraping efficiency.

[0066] See Figure 1 , Figure 2 as well as Figure 4In one embodiment, the miniature weighing scale 10 further includes a protective cover 700 and a cover plate 710. The protective cover 700 covers the weighing platform assembly 400, and the belt 100 is located between the protective cover 700 and the weighing platform assembly 400. The protective cover 700 has a weight hole 701. The cover plate 710 is connected to the protective cover 700 and can cover or open the weight hole 701, thereby allowing the weight to be replaced on the weighing platform assembly 400 by opening the weight hole 701 through the cover plate 710. Preferably, a placement box or placement platform is provided inside the weight hole 701 for placing weights, ensuring the surface of the weights is clean, ensuring the accuracy of the weights, and thus ensuring the accuracy of the measurement.

[0067] See Figure 1 , Figure 2 as well as Figure 4 In one embodiment, the miniature weighing scale 10 also includes a moisture meter 720. A through hole 702 is provided at the top of the cover 700, through which the moisture meter 720 passes and is connected to the cover body 610. The moisture meter 720 faces the belt 100, thus enabling the measurement of the moisture content of the material on the belt 100. A mounting bracket is provided on the cover body 610, and the moisture meter 720 is mounted on the mounting bracket, ensuring that the moisture meter 720 is vertically oriented towards the belt 100 and guaranteeing the measurement accuracy of the moisture meter 720.

[0068] See Figure 1 , Figure 2 as well as Figure 5 In one embodiment, the weighing platform assembly 400 includes: two first support rods 410, multiple first crossbeams 420, multiple metering rollers 430, and multiple sets of weight sensors 440. The two first support rods 410 are spaced apart along a direction perpendicular to the first direction OX and extend along the first direction OX. The multiple first crossbeams 420 are spaced apart along the first direction OX, with each end of the first crossbeam 420 connected to one of the two first support rods 410. The multiple sets of weight sensors 440 are spaced apart along the first direction OX, each set of weight sensors 440 including a first sensor and a second sensor, which are respectively disposed on the top of the two first support rods 410. The multiple metering rollers 430 and the multiple sets of weight sensors 440 correspond one-to-one, with each end of the metering roller 430 rotatably connected to the corresponding first and second sensors, respectively. The metering rollers 430 support the belt 100. In this embodiment, the first crossbeams 420 support the two first support rods 410, forming the frame of the weighing platform assembly 400, thereby facilitating the installation of the metering rollers 430 and the weight sensors 440. Multiple metering rollers 430 bear the weight of the belt 100 and transmit the weight of the belt 100 to the weight sensor 440, thereby weighing the material conveyed on the belt 100.

[0069] Preferably, the weighing platform assembly 400 further includes a speed sensor, which is mounted on the first support rod 410 or the first crossbeam 420 and measures the conveying speed of the belt 100 to calculate the material conveying flow rate in conjunction with the measurement results of the weight sensor 440. The weighing platform assembly 400 also includes a sensor bracket 450 and an amplifier 460, which is connected to the weight sensor 440 and amplifies the Mv-level signal to a V-level signal. One end of the sensor bracket 450 is connected to the weight sensor 440, and the other end is connected to the first support rod 410, for supporting the weight sensor 440. The miniature weighing scale 10 also includes an electronic control system, which is connected to the weight sensor 440 and the speed sensor, and analyzes the measurement results to obtain the flow rate, cumulative value, load, and speed.

[0070] Specifically, the weighing platform assembly 400 also includes multiple adjusting bolts 470, which are connected to the first support rod 410 and threadedly connected to the support frame 760. The adjusting bolts 470 are rotatable about a vertical axis, thereby adjusting the distance between the first support rod 410 and the support frame 760 along the first direction OX, allowing them to move closer to or further away from the upper belt 100. The support rod is used to hang weights.

[0071] Metering Principle: When material (q) passes through the weighing frame, the weighing sensor experiences a force Pg proportional to the weight of the tobacco. This force is amplified by an amplifier (460° signal) and outputs a voltage signal P. This signal is then converted into a weight code Mp by an A / D converter and sent to the PC for calculation. Simultaneously, the rotary encoder of the conveyor's AC motor sends out a pulse voltage signal representing the belt speed (100°), which is converted into a speed pulse Mv by a counter. For the weighing scale, the speed value Mv is a constant. The Mp and Mv signals are used to calculate the real-time flow rate Q = Kn × Mp × Mv. After integration, the cumulative output W = ∫Qndt is obtained. Control Principle: The control scale is essentially a combination of weighing and speed regulation functions. Based on the metering principle, we can adjust the flow rate by changing the Mv value through adjusting the belt speed V. When a given flow rate Qp is set, the arithmetic unit compares it with the real-time flow rate Qn to obtain the error E = Qp - Qn. After PID calculation, an incremental control signal is output to the frequency converter to change the motor speed, achieving quantitative feeding.

[0072] See Figure 1 , Figure 2 as well as Figure 6In one embodiment, the active roller assembly 200 includes two second support rods 210, a second crossbeam 220, a receiving guide plate 230, and a first roller 240. The two second support rods 210 are spaced apart along a direction perpendicular to the first direction OX and extend along the first direction OX. The second crossbeam 220, the receiving guide plate 230, and the first roller 240 are arranged sequentially spaced apart along the first direction OX. The first roller 240 is located on the side of the receiving guide plate 230 away from the unloading assembly 600 and tensions the belt 100. The receiving guide plate 230 is connected to the two second support rods 210 and receives the belt 100. The two ends of the second crossbeam 220 are connected to the two second support rods 210, and the two ends of the first roller 240 are rotatably connected to the two second support rods 210, respectively.

[0073] In this embodiment, the frame of the active roller assembly 200 is formed by the second support rod 210 and the second crossbeam 220. The first roller 240 carries the belt 100 and tensions the belt 100. The receiving guide plate 230 carries the belt 100, so that when the material falls from the upstream onto the belt 100, the receiving guide plate 230 carries the belt 100 to prevent the belt 100 from deforming, ensuring the service life and tension of the belt 100.

[0074] See Figure 1 , Figure 2 as well as Figure 7 In one embodiment, the driven roller assembly 300 includes: two third support rods 310, a third crossbeam 320, a tension roller group 330, and a second roller 340. The two third support rods 310 are spaced apart along a direction perpendicular to the first direction OX and extend along the first direction OX. The tension roller group 330, the third crossbeam 320, and the second roller 340 are arranged sequentially spaced apart along the first direction OX. The first roller 240 is located on the side of the third crossbeam 320 away from the weighing platform assembly 400 and tensions the belt 100. The tension roller group 330 includes two connecting plates 331 and a tension roller 332. The two connecting plates 331 are rotatably connected to the two third support rods 310 about the axis of the second direction OY. The two ends of the tension roller 332 are rotatably connected to the two connecting plates 331, and the two ends of the second roller 340 are rotatably connected to the two third support rods 310, respectively. The second direction OY is the width direction of the belt 100.

[0075] In this embodiment, the frame of the active roller assembly 200 is formed by the third support rod 310 and the third crossbeam 320. The second roller 340 carries the belt 100 and tensions the belt 100. By rotating the connecting plate 331, the tensioning roller 332 is driven to move closer to or away from the third support rod 310, thereby tensioning or relaxing the belt 100.

[0076] The active roller assembly 200 also includes an active correction assembly 250, which includes two adjusting blocks 251, two adjusting members 252, and an adjusting roller 253. The two adjusting blocks 251 are connected to two second support rods 210. The adjusting members 252 are inserted through the adjusting blocks 251 to connect the adjusting blocks 251 to the second support rods 210. The two ends of the adjusting roller are rotatably connected to the two adjusting blocks 251. By rotating the adjusting members 252, the adjusting roller 253 can be adjusted along the second direction OY, thereby manually correcting the belt 100.

[0077] The miniature weighing scale 10 in this application maintains weighing accuracy while reducing space size: the wheelbase between the main and driven rollers of the miniature scale is 1380mm, and the length of the weighing area is 800mm, which is more than half the length of conventional electronic scales (2780mm and 1840mm). The designed flow rate is generally around 150kg / h. Due to the small flow rate, a 6-10kg range sensor is selected for the weight sensor 440, and a thin and lightweight belt 100 is used to minimize the impact on the tare weight.

[0078] In this application, the tensioning of the annular belt 100 is actually achieved by tensioning both ends of the conveying direction of the belt 100 through the second roller 340 and the third roller 830.

[0079] See Figure 1 , Figure 2 as well as Figure 9 In one embodiment, the miniature weighing scale 10 further includes an automatic correction device 800, which comprises two fourth support rods 810, a fourth crossbeam 820, a third roller 830, and two clamping assemblies 840. The two fourth support rods 810 are spaced apart and extend along the first direction OX, perpendicular to it. The two ends of the fourth crossbeam 820 are respectively connected to the two fourth support rods 810, and the two ends of the third roller 830 are rotatably connected to the two ends of the two fourth support rods 810. The two clamping assemblies 840 are respectively disposed on the two fourth support rods 810, and respectively clamp the upper and lower surfaces of the belt 100 along the second direction OY. The belt 100 moves relative to the clamping assemblies 840 along the first direction OX, where the second direction OY is the width direction of the belt 100.

[0080] In this embodiment, the frame of the active roller assembly 200 is formed by the fourth support rod 810 and the fourth crossbeam 820. The belt 100 is carried and tensioned by the third roller 830. The belt 100 is clamped on both sides in the width direction by the clamping assembly 840, thereby limiting the belt 100 between the two clamping assemblies 840 and preventing the belt 100 from deviating in its width direction.

[0081] The clamping assembly 840 includes a connecting piece 841 and two clamping pieces 842. One end of the connecting piece 841 extends vertically and is connected to the fourth support rod 810. The other end of the connecting piece 841, away from the fourth support rod 810, is connected to the two clamping pieces 842. The clamping pieces 842 of the two clamping assemblies 840 move closer to each other along the second direction OY, thereby placing the upper and lower limits of the belt 100 between the two clamping pieces 842 of the clamping assembly 840 and the left and right limits between the two connecting pieces 841, thus ensuring stable transmission of the belt 100.

[0082] Specifically, the clamping assembly 840 also includes two limiting bearings 843, which are arranged at intervals along the first direction OX. The two ends of the limiting bearings 843 are respectively connected to two clamping pieces 842. The belt 100 is positioned between the four limiting bearings 843, and the belt 100 rolls with the four limiting bearings 843.

[0083] The automatic correction device 800 also includes a rotating shaft 850 and a rotating bearing 860. The inner ring of the rotating shaft 850 is connected to the inner ring of the rotating bearing 860, and the outer ring of the rotating bearing 860 is connected to the fourth crossbeam 820, so that the rotating shaft 850 and the fourth crossbeam 820 are rotatably connected around the vertical axis. The end of the rotating shaft 850 away from the rotating bearing 860 is connected to the support frame 760, so that the automatic correction device 800 can rotate relative to the support frame 760 around the vertical axis. The lower belt 100 is located between the four limit bearings 843 and rolls with the four limit bearings 843. When the belt 100 deviates, the lower belt 100 will rub against the limit bearings 843, causing the fourth crossbeam 820 to rotate relative to the support frame 760. The third roller 830 is at a certain deflection angle with the lower belt 100, thus realizing the automatic correction of the belt 100 by the third roller 830.

[0084] Specifically, the power unit 500 includes: a speed reducer (not shown), a motor (not shown), and an encoder (not shown). The encoder is connected to the speed reducer and the motor, and the motor is connected to the speed reducer. The speed reducer reduces the speed of the motor to control the transmission speed of the belt 100, the motor provides transmission power, and the encoder acquires the speed signal.

[0085] The power unit can also take other forms, such as cylinders or gear transmission devices; the specific form of power supply is not limited here.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A miniature electronic weighing scale, characterized in that, The miniature weighing electronic scale includes: a belt, a driving roller assembly, a driven roller assembly, a weighing platform assembly, a power unit, and a feeding assembly; The active roller assembly, the weighing platform assembly, and the driven roller assembly are arranged at intervals along a first direction; the belt is sleeved on the active roller assembly, the weighing platform assembly, and the driven roller assembly; the power unit is connected to the active roller assembly so that the active roller assembly drives the belt to rotate, and the first direction is the conveying direction of the belt; The feeding assembly is located on the side of the driven roller assembly away from the weighing platform assembly. The feeding assembly includes a cover and a scraper assembly. The cover covers the belt and has a feeding port. The scraper assembly is located on the cover and abuts against the outer side of the belt located below the driven roller assembly.

2. The miniature measuring electronic scale according to claim 1, characterized in that, The scraper assembly includes: a scraper strip, a scraper blade, and a soft leather strip; The scraper strip, the brush strip, and the soft leather strip are all connected to the cover. The scraper strip, the brush strip, and the soft leather strip are arranged sequentially along the first direction and all abut against the outer side of the belt located below the driven roller assembly.

3. The miniature measuring electronic scale according to claim 1, characterized in that, The feeding assembly also includes two abutment plates connected to the cover; The two abutment plates are located on both sides of the belt conveying direction and abut against the belt. The abutment plates are provided with arc-shaped grooves, which are adapted to the shape of the end of the driven roller assembly away from the weighing platform assembly. The scraper assembly is located between the two abutment plates.

4. The miniature measuring electronic scale according to claim 3, characterized in that, The scraper assembly also includes two sliding parts; The two sliding parts are located on both sides of the belt conveying direction and connected to the cover. The two sliding parts correspond one-to-one with the two abutment plates. The abutment plates and the corresponding sliding parts slide in the first direction. The two ends of the scraper assembly are connected to the two abutment plates respectively. The abutment plates drive the scraper assembly to move closer to or away from the belt in the first direction.

5. The miniature measuring electronic scale according to claim 1, characterized in that, The miniature electronic scale also includes a protective cover and a cover plate. The protective cover is positioned above the scale platform assembly, and the belt is located between the protective cover and the scale platform assembly. The protective cover has a weight hole, and the cover plate is connected to the protective cover and can cover or open the weight hole.

6. The miniature measuring electronic scale according to claim 5, characterized in that, The miniature electronic scale also includes a moisture meter; The top of the protective cover has a through hole, through which the moisture meter is inserted and connected to the cover body, with the moisture meter facing the belt.

7. The miniature measuring electronic scale according to claim 1, characterized in that, The weighing platform assembly includes: two first support rods, multiple first crossbeams, multiple metering rollers, and multiple sets of weight sensors; Two first support rods are spaced apart in a direction perpendicular to the first direction and extend along the first direction; a plurality of first crossbeams are spaced apart in the first direction, and the two ends of the first crossbeams are respectively connected to the two first support rods. Multiple sets of weight sensors are arranged at intervals along the first direction. Each set of weight sensors includes a first sensor and a second sensor. The first sensor and the second sensor are respectively disposed on the top of the two first support rods. Multiple metering rollers and multiple sets of weight sensors correspond one-to-one. The two ends of the metering rollers are rotatably connected to the corresponding first sensor and second sensor, respectively. The metering rollers are used to support the belt.

8. The miniature measuring electronic scale according to claim 7, characterized in that, The active roller assembly includes two second support rods, a second crossbeam, a receiving guide plate, and a first roller; Two second support rods are spaced apart along a direction perpendicular to the first direction and extend along the first direction. A second crossbeam, a receiving guide plate, and a first roller are arranged in sequence along the first direction. The first roller is located on the side of the receiving guide plate away from the feeding assembly and tensions the belt. The receiving guide plate is connected to the two second support rods and receives the belt. Both ends of the second crossbeam are connected to the two second support rods. Both ends of the first roller are rotatably connected to the two second support rods respectively.

9. The miniature measuring electronic scale according to claim 8, characterized in that, The driven roller assembly includes: two third support rods, a third crossbeam, a tensioning roller group, and a second roller; The two third support rods are spaced apart along a direction perpendicular to the first direction and extend along the first direction. The tensioning roller group, the third crossbeam and the second roller are arranged in sequence spaced apart along the first direction. The first roller is located on the side of the third crossbeam away from the weighing platform assembly and tensions the belt. The tensioning roller assembly includes two connecting plates and a tensioning roller. The two connecting plates are rotatably connected to the two third support rods about the axis of the second direction. The two ends of the tensioning roller are rotatably connected to the two connecting plates. The two ends of the second roller are rotatably connected to the two third support rods. The second direction is the width direction of the belt.

10. The miniature measuring electronic scale according to claim 9, characterized in that, The miniature electronic scale also includes an automatic correction device, which includes: two fourth support rods, a fourth crossbeam, a third roller, and two clamping components. The two fourth support rods are spaced apart in a direction perpendicular to the first direction and extend along the first direction. The two ends of the fourth crossbeam are respectively connected to the two fourth support rods, and the two ends of the third roller are respectively rotatably connected to the two ends of the two fourth support rods. Two clamping components are respectively mounted on two fourth support rods. The two clamping components clamp the upper and lower surfaces of the belt on both sides along the second direction. The belt moves relative to the clamping components along the first direction, where the second direction is the width direction of the belt.

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