Dynamic scale body capable of being transported

Abstract

The utility model relates to the technical field of logistics transportation, and discloses a dynamic scale body capable of transportation, which comprises two groups of scale side plates, and weighing assemblies are arranged on the scale side plates. According to the dynamic scale body capable of carrying out transportation, in order to better carry out dynamic weighing and improve the transportation efficiency, the two groups of scale side plates are stably connected by arranging a weighing assembly and matching with a square pipe, and when a motor body on a motor fixing plate is started, a rotating shaft drives a driving synchronous wheel to rotate; the driving roller rotates in the mounted bearing in cooperation with transmission of the driven synchronous wheel and the synchronous belt, the belt rotates to convey materials in cooperation with auxiliary supporting of the driven shaft barrel and the lower carrier roller, and the tensioning degree of the belt can be adjusted in cooperation with the sliding groove, the deviation adjusting fixing block, the asynchronous motor, the threaded rod and the carrier roller adjusting block; and in cooperation with a sensor fixing plate, a cushion block, a weight sensor and a connector, accurate dynamic weighing is better achieved, and then the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of logistics and transportation technology, specifically to a dynamic weighing device capable of transportation. Background Technology

[0002] Weighing and transporting materials or goods are extremely common in many fields such as industrial production and logistics. As the industry develops, the requirements for these two functions are also increasing. Traditional weighing equipment and transport equipment are often independent entities, which causes many inconveniences in actual use and cannot meet the needs of efficient and accurate modern production and logistics.

[0003] Common weighing equipment, such as electronic scales, can achieve a certain level of accuracy when weighing regular items in a static environment. However, when it comes to dynamic weighing, such as weighing continuously moving materials on a production line, the accuracy is greatly reduced. This is because the materials will vibrate and be impacted during the movement, interfering with the signal acquisition of the weighing sensor and causing a large deviation in the measurement results.

[0004] Traditional weighing equipment lacks a stable support structure to make the weighing body more stable, providing solid support for materials and belts. However, belt speed and tension are inconvenient to adjust, and the transport and weighing performance of the weighing body needs to be improved. In view of this, we propose a dynamic weighing body that can be used for transport. Utility Model Content

[0005] The purpose of this invention is to provide a dynamic weighing device capable of transportation, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dynamic weighing platform capable of transportation includes two sets of weighing side plates, and a weighing component is disposed on each weighing side plate. The weighing component includes:

[0008] The two sets of weighing side plates are fixedly connected by a square tube. A motor fixing plate is fixedly installed on the outer wall of one set of weighing side plates. A motor body is fixedly installed on the outer wall of the motor fixing plate. A rotating shaft is fixedly installed at the output end of the motor body. A driving synchronous pulley is fixedly installed on the outer wall of the rotating shaft. The two ends of the driving roller are rotatably installed between the bottom centers of the two sets of weighing side plates through bearing seats. A driven synchronous pulley is fixedly installed on the outer wall of the driving roller. A synchronous belt meshes between the driving synchronous pulley and the driven synchronous pulley.

[0009] A driven shaft cylinder is rotatably mounted between the two sets of weighing side plates via bearing components. A belt is driven between the driving roller and the driven shaft cylinder. The belt slides against the outside of the lower support roller. There are two sets of lower support rollers. One set of lower support rollers is rotatably mounted between the two sets of weighing side plates via bearing components, and the other set of lower support rollers is rotatably mounted inside the support roller adjusting block via bearing components.

[0010] The side plate of the weighing device has a through groove, and the lower idler roller connected to the idler roller adjustment block passes through the groove. The lower idler roller is adjusted by the deviation adjustment mechanism.

[0011] A sensor fixing plate is fixedly installed at the bottom of the weighing side plate, and a pad is fixedly installed at the top of the transport equipment body. A weight sensor is fixedly installed between the sensor fixing plate and the pad, and a connector is provided on the weight sensor.

[0012] In a further embodiment, the square tube is provided in two sets, making the weighing body more stable.

[0013] In a further embodiment, the belt alignment mechanism includes an alignment fixing block. The alignment fixing block is fixedly installed on the outer wall of the weighing side plate. Two sets of alignment fixing blocks are provided on each set of the weighing side plate. An asynchronous motor is fixedly installed on the outer wall of the alignment fixing block. A threaded rod is fixedly installed at the output end of the asynchronous motor. The two ends of the threaded rod are rotatably installed inside the alignment fixing block through bearing components. The idler roller adjusting block is threadedly installed on the threaded rod to better adjust the tension of the belt.

[0014] In a further embodiment, four sets of sensor fixing plates, pads, weight sensors, and connectors are provided, and the four sets of sensor fixing plates, pads, weight sensors, and connectors are located at the four corners of the bottom end of the belt. The weight sensors are strain gauge type sensors, which makes the weighing accuracy higher.

[0015] In a further embodiment, an auxiliary component is provided outside the weight sensor. The auxiliary component includes a slide rod, and the slide rod is fixedly installed between the two sets of the adjustment fixing blocks. A sliding sleeve is fixedly installed inside the roller adjusting block, and the sliding sleeve is slidably installed outside the slide rod. Two sets of slide rods and sliding sleeves are provided.

[0016] In a further embodiment, a connecting rod is fixedly installed between the bottom ends of the two sets of weighing side plates, and two sets of the connecting rod are provided to make the weighing body more stable.

[0017] In a further embodiment, a support frame is fixedly installed between the tops of the two side plates. The top of the support frame is slidably fitted to the inner wall of the belt. A support beam is fixedly installed inside the support frame. The support beam is in a "rice" shape, providing continuous support for the belt and the material, reducing the sagging phenomenon of the belt caused by its own gravity and the weight of the material.

[0018] Compared with the prior art, the present utility model provides a dynamic weighing body capable of transportation, having the following beneficial effects:

[0019] 1. For the dynamic weighing body capable of transportation, in order to better perform dynamic weighing and improve transportation efficiency, by setting a weighing component, the two weighing side plates are firmly connected through square tubes. When the motor body on the motor fixing plate is started, the rotating shaft drives the driving synchronous pulley to rotate. With the transmission of the driven synchronous pulley and the synchronous belt, the driving roller rotates inside the pedestal bearing. With the auxiliary support of the driven shaft cylinder and the lower idler roller, the belt rotates for material transportation. With the chute, deviation adjustment fixing block, asynchronous motor, threaded rod and idler roller adjustment block, the tension of the belt can be adjusted. With the sensor fixing plate, cushion block, weight sensor and connector, better accurate dynamic weighing can be achieved, thereby improving production efficiency.

[0020] 2. For the dynamic weighing body capable of transportation, in order to make the weighing body more stable, by setting an auxiliary component, when the idler roller adjustment block moves, the sliding sleeve slides synchronously outside, making the movement of the idler roller adjustment block more stable, and better limiting it at the same time. With the connecting rod, the two weighing side plates are connected more firmly. With the support of the support frame and the support beam for the belt, continuous support is provided for the belt and the material, reducing the sagging phenomenon of the belt caused by its own gravity and the weight of the material, thereby making the weighing body more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic view of the overall structure of the present utility model from the first perspective;

[0022] Figure 2 is a schematic view of the overall structure of the present utility model from the second perspective;

[0023] Figure 3 is of the present utility model Figure 2 is an enlarged schematic view of the structure of area A in the present utility model;

[0024] Figure 4 is of the present utility model Figure 2 is an enlarged schematic view of the structure of area B in the present utility model;

[0025] Figure 5 is a schematic view of the overall structure of the present utility model from the third perspective;

[0026] Figure 6This is a cross-sectional view of part of the structure of this utility model;

[0027] Figure 7 This is an exploded view of part of the structure of this utility model;

[0028] Figure 8 This is a flowchart illustrating the weighing process of this utility model.

[0029] Explanation of icon numbers:

[0030] 1. Refers to the side plate;

[0031] 2. Weighing assembly; 21. Square tube; 22. Motor mounting plate; 23. Motor body; 24. Shaft; 25. Driven synchronous pulley; 26. Bearing with seat; 27. Driven roller; 28. Driven synchronous pulley; 29. ​​Synchronous belt; 210. Driven shaft cylinder; 211. Lower idler roller; 212. Belt; 213. Slide groove; 214. Adjustment fixing block; 215. Asynchronous motor; 216. Threaded rod; 217. Idler roller adjusting block; 218. Sensor mounting plate; 219. Pad; 220. Weight sensor; 221. Connector;

[0032] 3. Auxiliary components; 31. Slide rod; 32. Slide sleeve; 33. Connecting rod; 34. Support frame; 35. Support beam. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0035] Please see Figures 1-8 This utility model provides a technical solution:

[0036] A dynamic weighing device capable of transportation includes two sets of weighing side plates 1.

[0037] In one embodiment of this utility model, a weighing assembly 2 is provided on the weighing side plate 1. The weighing assembly 2 includes a square tube 21. Two sets of weighing side plates 1 are fixedly connected by the square tube 21. In addition, two sets of square tubes 21 are provided to make the weighing body more stable. A motor fixing plate 22 is fixedly installed on the outer wall of one set of weighing side plates 1. A motor body 23 is fixedly installed on the outer wall of the motor fixing plate 22. A rotating shaft 24 is fixedly installed at the output end of the motor body 23. A drive synchronous wheel 25 is fixedly installed on the outer wall of the rotating shaft 24. The two ends of the drive roller 27 are rotatably installed between the bottom centers of the two sets of weighing side plates 1 through bearings 26. The outer wall of the drive roller 27 is fixedly installed. A driven synchronous pulley 28 is fixedly installed, and a synchronous belt 29 meshes between the driving synchronous pulley 25 and the driven synchronous pulley 28. A driven shaft cylinder 210 is rotatably installed between the two ends of the two sets of weighing side plates 1 via bearing components. A belt 212 is rotatably installed between the driving roller 27 and the driven shaft cylinder 210. The belt 212 slides against the outside of the lower idler roller 211. There are two sets of lower idler rollers 211. One set of lower idler rollers 211 is rotatably installed between the two sets of weighing side plates 1 via bearing components, and the other set of lower idler rollers 211 is rotatably installed inside the idler roller adjusting block 217 via bearing components. A through groove 213 is opened on the weighing side plate 1 to connect with the idler roller. The lower idler roller 211 connected to the roller adjusting block 217 passes through the chute 213. The lower idler roller 211 is adjusted by an adjustment mechanism. Further, the adjustment mechanism includes an adjustment fixing block 214. An adjustment fixing block 214 is fixedly installed on the outer wall of the side plate 1. Two sets of adjustment fixing blocks 214 are provided on each side plate 1. An asynchronous motor 215 is fixedly installed on the outer wall of the adjustment fixing block 214. A threaded rod 216 is fixedly installed at the output end of the asynchronous motor 215. Both ends of the threaded rod 216 are rotatably installed inside the adjustment fixing block 214 via bearing components. The idler roller adjusting block 217 is threadedly installed on the threaded rod 216 for better adjustment of the belt 212. The tension is measured by a sensor fixing plate 218 fixedly installed at the bottom of the side plate 1, a pad 219 fixedly installed at the top of the transport equipment body, a weight sensor 220 fixedly installed between the sensor fixing plate 218 and the pad 219, and a connector 221 provided on the weight sensor 220. In addition, there are four sets of sensor fixing plates 218, pads 219, weight sensors 220 and connectors 221, and the four sets of sensor fixing plates 218, pads 219, weight sensors 220 and connectors 221 are located at the four corners of the bottom end of the belt 212. The weight sensor 220 is a strain gauge sensor, which makes the weighing accuracy higher.

[0038] In this embodiment, when the motor body 23 (stepper frequency converter type) is connected to 220V mains power and started under the control of the PLC controller, the output end of the motor body 23 begins to rotate, driving the rotating shaft 24 fixedly connected to it to rotate together. The driving synchronous pulley 25 rotates under the drive of the rotating shaft 24, and establishes a transmission connection with the driven synchronous pulley 28 through the synchronous belt 29. The teeth on the surface of the synchronous belt 29 mesh with the teeth of the driving synchronous pulley 25 and the driven synchronous pulley 28 to form a stable transmission system. The driven synchronous pulley 28 is fixedly installed on the driving roller 27. With the transmission of the synchronous belt 29, the driving roller 27 begins to rotate. The two ends of the driving roller 27 are rotatably installed at the bottom center of the two sets of side plates 1 through the bearing 26. The bearing 26 not only provides stable support for the driving roller 27, but also greatly reduces the friction during its rotation, so that the driving roller 27 can rotate smoothly. The rotation of the driving roller 27 is driven by friction. The belt 212 moves, carrying the material on the weighing platform. The driven shaft cylinder 210 is installed at both ends of the two sets of weighing side plates 1, forming a support frame for the belt 212 together with the drive roller 27, ensuring that the belt 212 can maintain a stable running trajectory. The lower idler roller 211 is in close contact with the outside of the belt 212, sharing the weight of the belt 212 and the pressure of the material, further improving the stability and reliability of the belt 212's operation, thereby achieving smooth and efficient transportation of materials on the belt 212. The rotational speed of the motor body 23 can be flexibly adjusted according to actual production needs. The rotational speed is adjusted by changing the frequency of the power input to the motor body 23. For example, in scenarios requiring precise weighing, the speed of the belt 212 can be reduced, allowing the weight sensor 220 more time to collect a stable weight signal; while in links with high transportation efficiency requirements, the speed of the belt 212 can be appropriately increased to achieve efficient transportation.

[0039] The alignment fixing blocks 214 are symmetrically installed on the outer wall of the weighing side plate 1. Two sets of alignment fixing blocks 214 are provided on each weighing side plate 1, providing a mounting base for the asynchronous motor 215 and the threaded rod 216. When the belt 212 becomes loose due to prolonged use or other factors, affecting transportation and weighing accuracy, the PLC controller issues a command to start the asynchronous motor 215. The threaded rod 216 at the output end of the asynchronous motor 215 begins to rotate. The idler roller adjusting block 217 is tightly connected to the threaded rod 216 via threads. When the threaded rod 216... When the 16 rotates, according to the principle of screw transmission, the roller adjusting block 217 will move laterally along the direction of the slide groove 213. The lower roller 211 connected to the roller adjusting block 217 moves with the movement of the roller adjusting block 217. When the two sets of lower rollers 211 approach each other, the belt 212 is gradually tightened, thereby realizing the precise adjustment of the belt 212 tension. This adjustment method can quickly and effectively solve the problem of belt 212 slack, ensure that the belt 212 is always in the best working condition, and improve the transportation and weighing performance of the weighing body.

[0040] At the four corners of the bottom end of the belt 212, there are arranged a sensor fixing plate 218, a cushion block 219, a weight sensor 220 and a connector 221. They together constitute a high-precision weighing system. The sensor fixing plate 218 is fixedly installed at the bottom of the weighing side plate 1, providing a stable installation platform for the entire weighing system. The cushion block 219 is installed at the top end of the transportation equipment body, playing a buffering and supporting role to ensure that the weight sensor 220 can accurately sense the pressure of the belt 212 and the material. When the material is placed on the belt 212 for transportation, the weight of the material and the weight of the belt 212 itself will exert pressure on the belt 212. This pressure is transmitted to the weight sensor 220. The weight sensor 220 adopts a strain gauge type sensor. Specifically, when the material is placed on the belt 212, the gravity of the material will act on the elastic element of the sensor. The elastic element is deformed by the force, and the strain gauge attached to its surface will also deform accordingly, thereby causing a change in the resistance value of the strain gauge. According to the piezoresistive effect in physics, the change in the resistance value is proportional to the applied pressure (i.e., the gravity of the material). The tiny change in the resistance value of the strain gauge is converted into an electrical signal output through a Wheatstone bridge circuit. However, this electrical signal is usually very weak and difficult to be directly recognized and processed by the system. Therefore, it is necessary to amplify the electrical signal through an amplifier circuit composed of multiple operational amplifiers to increase its amplitude to a suitable range for subsequent processing. The amplified electrical signal is transmitted to the data acquisition module. This module collects the signal at a very high sampling frequency to ensure that the real-time weight change of the material during transportation can be captured. The collected data is then transmitted to the microprocessor. The microprocessor with built-in algorithms, on the one hand, filters the collected original data to remove the noise signals generated by factors such as material vibration and environmental electromagnetic interference, thereby improving the accuracy of the data; on the other hand, according to the pre-calibrated sensor characteristic curve, it converts the electrical signal data into the corresponding weight value and displays it on the display screen in real time.

[0041] In an embodiment of the present utility model, an auxiliary component 3 is provided outside the weight sensor 220. The auxiliary component 3 includes a slide bar 31. The slide bar 31 is fixedly installed between two sets of deviation adjustment fixing blocks 214. A slide sleeve 32 is fixedly installed inside the roller adjustment block 217. The slide sleeve 32 is slidably installed outside the slide bar 31. There are two sets of the slide bar 31 and the slide sleeve 32. In addition, two connecting rods 33 are fixedly installed between the bottom ends of the two weighing side plates 1. There are two sets of the connecting rods 33, making the weighing body more stable. In addition, a support frame 34 is fixedly installed between the top ends of the two weighing side plates 1. The top of the support frame 34 is slidably fitted to the inner wall of the belt 212. A support beam 35 is fixedly installed inside the support frame 34. The support beam 35 is in a "rice" shape, providing continuous support force for the belt 212 and the material, and reducing the sagging phenomenon of the belt 212 caused by its own gravity and the weight of the material.

[0042] In this embodiment, the slide rod 31 is installed across the two sets of adjusting blocks 214, providing a stable guide track for the movement of the idler roller adjusting block 217. The sliding sleeve 32 is tightly fitted with the slide rod 31 and can slide freely outside the slide rod 31. When the idler roller adjusting block 217 moves laterally under the drive of the threaded rod 216, the sliding sleeve 32 slides synchronously on the slide rod 31. This cooperation between the slide rod 31 and the sliding sleeve 32 not only reduces the friction when the idler roller adjusting block 217 moves, but also plays a guiding and limiting role. During the movement of the idler roller adjusting block 217, the slide rod 31 and the sliding sleeve 32 can effectively prevent the idler roller adjusting block 217 from deviating or shaking, ensuring that it moves smoothly in the predetermined direction. This avoids the problem of inaccurate belt tension adjustment caused by the unstable movement of the idler roller adjusting block 217, thereby ensuring the normal operation of the weighing body and the weighing accuracy. The two sets of connecting rods 33 are symmetrically fixedly installed on the two sets of weighing sides. The two sets of weighing side plates 1 are tightly connected at the bottom of the plate 1, which greatly enhances the overall rigidity and stability of the weighing body. The support frame 34 is fixedly installed between the top of the two sets of weighing side plates 1, providing reliable support for the belt 212. The "rice" shaped support beam 35 inside the support frame 34 can evenly distribute the weight of the belt 212 and the material, providing continuous and stable support for the belt 212 and the material. During the transportation of materials by the belt 212, the belt 212 will sag to a certain extent due to its own weight and the weight of the material. The "rice" shaped support beam 35 can effectively resist this sag, maintain the flatness and stability of the belt 212, ensure that the material can be transported smoothly on the belt 212, and also improve the accuracy of weighing. In addition, the stable weighing body structure can also reduce the impact of vibration and shaking on electronic components (such as weight sensor 220), extend the service life of the weighing body, and reduce equipment maintenance costs.

[0043] All electrical components mentioned in this application are electrically connected to the PLC controller and 220V AC mains power. The PLC controller is a conventional and known device that can control the motor body 23, asynchronous motor 215, weight sensor 220, and connector 221. All standard parts used in this application can be purchased from the market. The specific connection methods of each part are all conventional methods such as riveting and welding, which are mature in the prior art. The standard parts are all conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art. It should be noted that the above electrical components are all prior art products. Those skilled in the art should select, install, and complete the circuit debugging work according to the needs of use to ensure that all electrical components can work normally. The components are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. No specific restrictions are made here, and no specific description will be made here.

[0044] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A transportable dynamic scale comprising scale side panels (1) provided in two sets, characterised in that: A weighing component (2) is provided on the weighing side plate (1), and the weighing component (2) includes: A square tube (21) is used to fix the two sets of weighing side plates (1) together. A motor fixing plate (22) is fixedly installed on the outer wall of one set of weighing side plates (1). A motor body (23) is fixedly installed on the outer wall of the motor fixing plate (22). A rotating shaft (24) is fixedly installed at the output end of the motor body (23). An active synchronous wheel (25) is fixedly installed on the outer wall of the rotating shaft (24). An active roller (27) is rotatably installed at both ends of the bottom center of the two sets of weighing side plates (1) through a bearing (26). A driven synchronous wheel (28) is fixedly installed on the outer wall of the active roller (27). A synchronous belt (29) is engaged between the active synchronous wheel (25) and the driven synchronous wheel (28). Driven shaft cylinder (210), driven shaft cylinder (210) is rotatably installed between the two ends of the two sets of weighing side plates (1) through bearing components. A belt (212) is installed between the driving roller (27) and the driven shaft cylinder (210). The belt (212) slides against the outside of the lower support roller (211). There are two sets of lower support rollers (211). One set of lower support rollers (211) is rotatably installed between the two sets of weighing side plates (1) through bearing components. The other set of lower support rollers (211) is rotatably installed inside the support roller adjusting block (217) through bearing components. The slide groove (213) is provided on the side plate (1), and the lower roller (211) connected to the roller adjusting block (217) passes through the slide groove (213). The lower roller (211) is adjusted by the adjustment mechanism. A sensor fixing plate (218) is fixedly installed at the bottom of the weighing side plate (1), and a pad (219) is fixedly installed at the top of the transport equipment body. A weight sensor (220) is fixedly installed between the sensor fixing plate (218) and the pad (219), and a connector (221) is provided on the weight sensor (220).

2. A transportable dynamic scale according to claim 1 wherein: The square tube (21) is provided in two sets.

3. A transportable dynamic scale according to claim 1 wherein: The adjustment mechanism includes an adjustment fixing block (214). The adjustment fixing block (214) is fixedly installed on the outer wall of the weighing side plate (1). Two sets of adjustment fixing blocks (214) are provided on the single set of the weighing side plate (1). An asynchronous motor (215) is fixedly installed on the outer wall of the adjustment fixing block (214). A threaded rod (216) is fixedly installed at the output end of the asynchronous motor (215). The two ends of the threaded rod (216) are rotatably installed inside the adjustment fixing block (214) through bearing components. The roller adjusting block (217) is threadedly installed on the threaded rod (216).

4. A transportable dynamic scale according to claim 1 wherein: There are four sets of the sensor fixing plate (218), the spacer block (219), the load cell (220) and the connector (221). The four sets of the sensor fixing plate (218), the spacer block (219), the load cell (220) and the connector (221) are located at the four corners of the bottom end of the belt (212), and the load cell (220) is a strain gauge type sensor.

5. A transportable dynamic scale according to claim 3 wherein: An auxiliary component (3) is arranged outside the load cell (220). The auxiliary component (3) includes a slide bar (31). The slide bar (31) is fixedly installed between two sets of the deviation adjusting fixing blocks (214). A slide sleeve (32) is fixedly installed inside the idler adjusting block (217). The slide sleeve (32) is slidably installed outside the slide bar (31). There are two sets of the slide bar (31) and the slide sleeve (32).

6. A transportable dynamic scale according to claim 5 wherein: A connecting rod (33) is fixedly installed between the bottom ends of two sets of the weighing side plates (1). There are two sets of the connecting rod (33).

7. A transportable dynamic scale according to claim 6 wherein: A support frame (34) is fixedly installed between the top ends of two sets of the weighing side plates (1). The top of the support frame (34) is slidably fitted to the inner wall of the belt (212). A support beam (35) is fixedly installed inside the support frame (34). The support beam (35) is in a "rice" shape.

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