A fixed-point weighing sorting system and cargo weighing method

Abstract

The present invention provides a sorting system and a cargo weighing method for fixed-point weighing; it includes a sorting machine track, a sorting trolley and a weighing module. One or more weighing modules are arranged on the sorting machine track. The weighing module includes a weighing sensor and a weighing track. The weighing track is installed on the weighing sensor. The sorting trolley includes a frame, a passive lifting structure and a cargo bearing structure. The passive lifting structure includes a lifting base, a connecting rod, a lifting bracket and a lifting roller. In the present invention, a parallelogram mechanism is used to connect the frame and the cargo bearing structure in the sorting trolley, and the lifting roller is used to cooperate with the weighing track to lift the cargo bearing structure, so that the weight of the cargo bearing structure is borne on the weighing track, thereby achieving accurate weighing; because the frame is not borne on the weighing track, the influence of the interaction force between different frames on the accuracy of weighing is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of logistics sorting equipment, and in particular relates to a fixed-point weighing sorting system and a cargo weighing method. Background Art

[0002] In the field of modern logistics and industrial production, the sorting and weighing of goods are crucial links, which are of key significance for improving logistics efficiency, ensuring accurate delivery of goods, and realizing refined management of the production process. At present, in common sorting systems, sorting carts usually adopt a structure connected in sequence to realize continuous transmission and sorting operations of goods. This structure meets the needs of large-scale cargo processing to a certain extent and improves the overall sorting efficiency.

[0003] In order to realize dynamic weighing of goods, the industry usually needs to install weighing sensors on each sorting cart. On the one hand, the solution of installing weighing sensors on all sorting carts increases the cost of the sorting machine; on the other hand, the dynamic sorting cart needs to use a busbar to upload weight data, which increases the complexity of the communication structure.

[0004] In addition, when a single sorting trolley is dynamically weighed using a section of weighing track, the connection structure and interaction force between adjacent trolleys will have a significant impact on the weighing result. For example, factors such as the vibration of adjacent trolleys and the tension of connecting parts will interfere with the trolley being weighed, causing the weighing sensor to be unable to accurately obtain the true weight of the goods on the target trolley. This interference greatly reduces the weighing accuracy of a single trolley and is prone to weighing errors.

[0005] The patent with publication number "CN116651761A" provides "a high-speed dynamic weighing and sorting machine and a dynamic weighing and sorting method thereof", in which each sorting trolley operates independently, eliminating the mutual influence between adjacent trolleys; however, in this solution, each trolley needs to be independently equipped with a power source, which is relatively costly. Summary of the invention

[0006] The object of the present invention is to provide a fixed-point weighing sorting system and a cargo weighing method.

[0007] In a first aspect, the present invention provides a sorting system for fixed-point weighing, which includes a sorting machine track, a sorting trolley and a weighing module. The sorting machine track is provided with one or more weighing modules. The weighing module includes a weighing sensor and a weighing track. The weighing track is installed on the weighing sensor.

[0008] The sorting trolley includes a frame, a passive lifting structure and a cargo carrying structure. The passive lifting structure includes a lifting base, a connecting rod, a lifting bracket and a lifting roller. The lifting base is mounted on the frame. One end of the connecting rod forms a rotating pair with the lifting base. The other end of the connecting rod forms a rotating pair with the lifting bracket. The lifting base, the lifting bracket and at least two connecting rods form a parallelogram mechanism. The cargo carrying structure is mounted on the lifting bracket. The lifting roller is mounted on the lifting bracket or the cargo carrying structure. The position of the lifting roller matches the weighing track.

[0009] When the sorting trolley passes through the weighing module, the lifting bracket is lifted under the support of the weighing track; the weighing track provides support for the lifting bracket, lifting rollers, cargo bearing structure, and cargo transported by the sorting trolley, so that the weighing sensor measures the weight of the cargo.

[0010] Preferably, the weighing module further comprises a lifting guide rail. Each weighing rail corresponds to two lifting guide rails. The weighing rail is located between the corresponding two lifting guide rails. The lifting guide rail is at the same height as the opposite end of the weighing rail. An inclined guide rail surface is provided at the end of the top surface of the lifting guide rail away from the weighing rail. The inclined guide rail surface gradually decreases in the direction away from the weighing section. In the initial state, the bottom edge of the lifting roller is lower than the top surface of the weighing rail and higher than the lowest point of the inclined guide rail surface on the lifting guide rail.

[0011] Preferably, the frame is provided with a support surface that matches the bottom of the lifting bracket. In the initial state, the lifting bracket is supported on the support surface of the frame.

[0012] Preferably, lifting rollers are rotatably mounted on both sides of the lifting bracket. Two weighing tracks located above the sorting machine track are arranged in each weighing module; and the lifting rollers on both sides of the lifting bracket correspond to the positions of the two weighing tracks in the weighing module.

[0013] Preferably, the weighing module further comprises a connecting bracket. The weighing sensor is arranged below the sorting machine track. The connecting bracket comprises a bottom connecting beam and two supporting side plates. The bottom connecting beam is fixed to the weighing sensor. The two ends of the bottom connecting beam are respectively fixed to the bottoms of the two supporting side plates. The two supporting side plates are respectively located on both sides of the sorting machine track. The two weighing tracks are respectively fixed to the tops of the opposite sides of the two supporting side plates.

[0014] Preferably, when the lifting roller is supported on the weighing track, the pulling direction of the connecting rod on the lifting bracket is parallel to the horizontal plane.

[0015] Preferably, the cargo carrying structure adopts a tilting plate carrying structure, including a flipping and resetting structure and a pallet. The flipping and resetting structure is installed on the top of the passive lifting structure; the pallet is installed on the top of the flipping and resetting structure. The flipping and resetting structure can lock the pallet in a horizontal state, and can flip to the side after unlocking.

[0016] Preferably, the weighing module is installed on a straight section of the sorting machine track.

[0017] Preferably, the frames of multiple sorting trolleys are sequentially connected through connecting rods to form a circular trolley queue, and can circulate along the sorting machine track.

[0018] Preferably, the frame is provided with a guide support wheel set that cooperates with the sorting machine track.

[0019] Preferably, a sorting grid opening is arranged on one side of the sorting machine track or sorting grid openings are arranged on both sides.

[0020] In a second aspect, the present invention provides a method for weighing goods in a sorting system, which uses the aforementioned fixed-point weighing sorting system. The method for weighing goods in the sorting system is as follows: when the sorting trolley carrying goods moves along the sorting machine track to the weighing module, the lifting roller rises along the lifting guide track; when the lifting roller reaches the weighing track, the lifting bracket, the lifting roller, the goods carrying structure and the goods are supported by the weighing track; the weight of the goods is obtained according to the detection value of the weighing sensor.

[0021] As a preference, the cargo weight G s The expression is as follows:

[0022]

[0023] in, The supporting force of the weighing track on the object above it measured by the weighing sensor is the difference between the weights measured by the weighing sensor before and after the lifting roller reaches the weighing track. is the rolling friction coefficient between the lifting roller and the weighing track; is the radius of the lifting roller. G1 is the total weight of the lifting bracket, lifting roller and cargo carrying structure. It is the angle between the pulling direction of the connecting rod on the lifting bracket and the horizontal plane.

[0024] The present invention has the following beneficial effects:

[0025] The present invention uses a parallelogram mechanism to connect the frame and the cargo carrying structure in the sorting cart, and uses lifting rollers to cooperate with the weighing track to lift the cargo carrying structure, so that the weight of the cargo carrying structure is borne on the weighing track, thereby achieving accurate weighing; because the frame is not borne on the weighing track, the influence of the interaction force between different frames on the weighing accuracy is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged view of part A.

[0028] Figure 3 It is a schematic diagram of the connection between the weighing module and the frame in the present invention.

[0029] Figure 4 It is a side schematic diagram of the sorting trolley in the present invention.

[0030] Figure 5 It is a three-dimensional schematic diagram of the sorting trolley in the present invention.

[0031] Figure 6 It is a force analysis diagram of the measured part during the weighing process of the present invention.

[0032] Figure markings: 1. Frame; 2. Sorting machine track; 3. Weighing module; 3-1. Weighing sensor; 3-2. Connecting bracket; 3-2-1. Bottom connecting beam; 3-2-2. Support side plate; 3-3. Weighing track; 3-4. Mounting bracket; 3-5. Lifting guide track; 3-5-1. Inclined guide rail surface; 4. Sorting trolley; 4-1. Frame; 4-2. Guide support wheel set; 4-3. Passive lifting structure; 4-3-1. Lifting base; 4-3-2. Connecting rod; 4-3-3. Lifting bracket; 4-3-4. Lifting roller; 4-4. Flip reset structure; 4-5. Tray. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 As shown, a fixed-point weighing sorting system comprises a frame 1, a sorting machine track 2, a sorting trolley 4 having a passive tray lifting structure 4-3, and a weighing module 3. The sorting machine track 2 is fixed on the frame 1; a plurality of sorting trolleys 4 arranged on the sorting machine track 2 are sequentially connected to form a ring, and can circulate along the sorting machine track 2. A sorting grid is arranged on one side of the sorting machine track 2 or on both sides.

[0036] like Figure 2 and Figure 3 As shown, a weighing area is provided on the sorting machine track 2. The weighing area can be set in the straight section of the sorting machine track 2 or in the curved section of the sorting machine track 2. The weighing module 3 includes a weighing sensor 3-1, a connecting bracket 3-2, a weighing track 3-3, a mounting bracket 3-4 and a lifting guide track 3-5. The weighing sensor 3-1 is installed on the frame 1 and is located directly below the weighing area of ​​the sorting machine track 2. The connecting bracket 3-2 includes a bottom connecting beam 3-2-1 and two supporting side plates 3-2-2. The bottom connecting beam 3-2-1 is fixed on the weighing sensor 3-1. The two ends of the bottom connecting beam 3-2-1 are respectively fixed to the bottom of the two supporting side plates 3-2-2. The two supporting side plates 3-2-2 are respectively located on both sides of the sorting machine track 2. The two weighing tracks 3-3 are respectively fixed to the tops of the opposite sides of the two supporting side plates 3-2-2.

[0037] The lifting guide rail 3-5 is used to guide the passive lifting structure 4-3 of the sorting trolley 4 to rise or reset smoothly. Each weighing rail 3-3 corresponds to two lifting guide rails 3-5. The weighing rail 3-3 is located between the corresponding two lifting guide rails 3-5. The lifting guide rail 3-5 and the opposite end of the weighing rail 3-3 are at the same height, close to each other and do not touch each other, so as to avoid the lifting guide rail 3-5 affecting the weighing accuracy. An inclined guide rail surface 3-5-1 is provided at one end of the top surface of the lifting guide rail 3-5 away from the weighing rail 3-3. The inclined guide rail surface 3-5-1 gradually decreases in the direction away from the weighing section.

[0038] like Figure 4 and Figure 5 As shown, the sorting trolley 4 includes a frame 4-1, a guide support wheel set 4-2, a passive lifting structure 4-3 and a tilting plate bearing structure. The guide support wheel set 4-2 is installed at the bottom of the frame 4-1 and cooperates with the sorting machine track 2 to guide and support the sorting trolley 4. The passive lifting structure 4-3 is installed on the frame 4-1; the tilting plate bearing structure is installed on the passive lifting structure 4-3 to carry and output goods.

[0039] The passive lifting structure 4-3 includes a lifting base 4-3-1, two connecting rods 4-3-2, a lifting bracket 4-3-3 and a lifting roller 4-3-4. The lifting base 4-3-1 is fixed on the frame 4-1. One end of the two connecting rods 4-3-2 and two different positions on the lifting base 4-3-1 respectively constitute a rotating pair. The other end of the two connecting rods 4-3-2 and two different positions on the lifting bracket 4-3-3 respectively constitute a rotating pair. The lifting base 4-3-1, the two connecting rods 4-3-2 and the lifting bracket 4-3-3 constitute a parallelogram mechanism, so that the lifting bracket 4-3-3 can only move along a circular trajectory, but cannot rotate. The frame 4-1 is provided with a supporting surface that cooperates with the bottom of the lifting bracket 4-3-3. The supporting surface is used to provide support for the lifting bracket 4-3-3 in the lower limit position. In the initial state without weighing, the lifting bracket 4-3-3 is supported on the supporting surface of the frame 4-1.

[0040] The lifting bracket 4-3-3 is a sheet metal bending structure, and the bottoms of its two outer sides are rotatably connected with lifting rollers 4-3-4. The two lifting rollers 4-3-4 can stably support the lifting bracket 4-3-3, the flip reset structure 4-4 and the tray 4-5 on the weighing module 3. The lifting rollers 4-3-4 on both sides of the lifting bracket 4-3-3 are matched with the two weighing tracks 3-3 in the weighing module 3 respectively.

[0041] The flip tray bearing structure includes a flip reset structure 4-4 and a tray 4-5. The flip reset structure 4-4 is installed on the top of the passive lifting structure 4-3; the tray 4-5 is installed on the top of the flip reset structure 4-4. The flip reset structure 4-4 can lock the tray 4-5 in a horizontal state, and after unlocking, it can be flipped to either side, so that the tray 4-5 can output the package to the inner or outer sorting grid 4. The flip reset structure 4-4 adopts an existing structure, for example, the flip reset structure described in the specific implementation method of the patent specification with publication number CN118419500A.

[0042] In the initial state, the bottom edge of the lifting roller 4-3-4 is lower than the top surface of the weighing track 3-3, and higher than the end of the inclined guide rail surface 3-5-1 on the lifting guide rail 3-5 that is away from the weighing track 3-3; the lifting guide rail 3-5 can guide the lifting roller 4-3-4 to rise, so that the lifting bracket 4-3-3 is separated from the supporting surface of the frame 4-1, and guide the lifting roller 4-3-4 to the weighing track 3-3.

[0043] Therefore, in the initial state, the weight of the flip reset structure 4-4, the tray 4-5 and the goods on the tray 4-5 is borne by the frame 4-1. When the sorting trolley 4 passes the weighing module 3, the weight of the flip reset structure 4-4, the tray 4-5 and the goods on the tray 4-5 is borne by the weighing track 3-3 instead of the frame 4-1, so that the weighing sensor 3-1 can measure the weight of the goods on the sorting trolley 4.

[0044] The length of the weighing track 3-3 is smaller than the pitch between adjacent sorting carts 4; the height lifting amount of the lifting roller 4-3-4 of the sorting cart 4 from the initial state to the weighing state is 5mm to 8mm; the turning angle of the connecting rod is 1.5° to 3°.

[0045] In some embodiments, the pallet 4-5 is a symmetrical structure with a concave middle portion and raised left and right sides. The front and rear sides of the pallet 4-5 are provided with upwardly folded retaining edges to prevent the goods from falling off the pallet 4-5.

[0046] When the lifting roller 4-3-4 of the sorting trolley 4 is on the weighing track 3-3, the angle between the connecting rod 4-3-2 and the horizontal plane is the inclined tension angle , the relationship between the pressure sensor detection value and the cargo weight is analyzed as follows:

[0047] The overall method is used to analyze the force on the sorting trolley 4, and the frame 4-1, the guide support wheel group 4-2, the lifting base 4-3-1, the connecting rod 4-3-2 and the pull rod are regarded as a whole, recorded as the moving part; the lifting bracket 4-3-3, the lifting roller 4-3-4, the flip reset structure 4-4, the pallet 4-5 and the goods are regarded as another whole, recorded as the measured part.

[0048] When the pull rod is located above the lifting bracket, the stress of the entire measured part is as follows: Figure 6 As shown in the figure, the pull rod of the traveling part exerts an inclined upward pulling force on the lifting bracket. , the gravity of the measured part , the support force of the weighing track on the measured part , horizontal rolling friction ; Since the car is moving at a constant speed and is in dynamic balance, the resultant force on the lifting bracket is .

[0049] Support This is the pressure value fed back by the weighing sensor (excluding the weight of the connecting bracket and the weighing track itself)

[0050] According to the balanced equation:

[0051] The forces in the vertical direction satisfy the following conditions:

[0052] Formula (1)

[0053] The forces in the horizontal direction satisfy the following conditions:

[0054] Formula (2)

[0055] From this we can get,

[0056] Formula (3)

[0057] Substituting equation (3) into equation (1), we get

[0058] Formula (4)

[0059] Similarly, when the pull rod is located below the lifting bracket, according to the equilibrium equation,

[0060] Formula (5)

[0061] In the above calculation, the tilt pull angle is an absolute value; sets the pull angle with the pull direction tilted upward Positive value, the pulling direction is inclined upward is a negative value; then the above equilibrium equations are unified into .

[0062] From equations (4) and (5), it can be seen that the difference between the weighing value and the actual value of the object is only the tangent value of the sliding friction force. The error range is obtained by calculation below.

[0063] Rolling friction The expression is as follows:

[0064] Formula (6)

[0065] In the formula, is the rolling friction coefficient, is the radius of the lifting roller.

[0066] Substituting equation (6) into equation (4), we get

[0067] Formula (7)

[0068] beg ,have to

[0069] Formula (8)

[0070] The total weight of the lifting bracket, lifting roller, flip reset structure and pallet 4-5 is recorded as G1; the weight of the cargo is recorded as G s , then the weight of the cargo is G s The expression is as follows:

[0071] Formula (9)

[0072] In some embodiments, each sorting vehicle measures the actual tilt pull angle after processing is completed. Each sorting trolley uses its corresponding actual tilt pull angle in calculation , in order to eliminate the influence of processing errors. The method of determining the serial number of the sorting trolley on the weighing track can be calculated by the running speed, or it can be detected by reading the NFC signal between the sorting trolley and the weighing track.

[0073] Example 2

[0074] A fixed-point weighing sorting system, the difference between this embodiment and embodiment 1 is that: when the lifting roller of the sorting trolley is on the weighing track, the connecting rod is in a horizontal posture, that is, the angle of the horizontal plane is the inclined tension angle is 0.

[0075] Ideally, in this embodiment, by keeping the connecting rod in a horizontal position during the weighing process, the vertical component of the pulling force of the frame on the lifting bracket can be eliminated. It is difficult to accurately control it to 0, but has a small error, which may be an upward tilt (i.e., tilt pull angle greater than 0), it may also tilt downward (i.e. tilt pull angle Less than 0). Therefore, the tilting tension angle caused by processing is calculated by the special value method. The error of the direct weighing affects the error as follows:

[0076] The weighing track is made of polyoxymethylene and the roller is made of polyurethane. The rolling friction coefficient between the two is between 0.05 and 0.1. The maximum value is 0.1.

[0077] Radius of lift roller The value of is 0.15m; the pull rod is formed due to the processing error Rounded to 1°, but actual processing and assembly errors Degrees less than this value;

[0078] The total weight G1 of the lifting bracket, lifting roller, flip reset structure and tray 4-5 is 2.098 kg, while the maximum weight of the package that can be placed on tray 4-5 is 0.5kg to 5kg. In order to facilitate the calculation of errors, the weight unit is no longer converted into the gravity unit.

[0079] Take the package weight 5kg, Take 7.1 kg; substitute into formula (7) to obtain the error relationship:

[0080] Formula (10)

[0081] That is, the weighing error range is -83g to 83g, which meets the design requirements; the actual error range should be much smaller than this value, so this embodiment can meet the weighing requirements of basic logistics sorting with higher weighing accuracy.

[0082] Take the package weight 0.5kg, Take 2.6 kg; substitute into formula (7) to obtain the error relationship:

[0083] Formula (10)

[0084] That is, the weighing error range is -30g to 30g, which meets the design requirements; the actual error range should be much smaller than this value, so this embodiment can meet the weighing requirements of basic logistics sorting with higher weighing accuracy.

[0085] In this embodiment, it is only necessary to eliminate the weight of the "connecting bracket 3-2, weighing track 3-3, lifting bracket 4-3-3, and tilting plate bearing structure" from the weight measured by the weighing sensor 3-1 by "peeling", and the net weight of the goods can be directly measured by the weighing sensor 3-1, which is simpler and more efficient than Example 1.

[0086] Example 3

[0087] A fixed-point weighing sorting system, the difference between this embodiment and embodiment 1 is that: the sorting trolley does not use a tilting tray sorting trolley, but uses a cross-belt sorting trolley; specifically, the tilting tray bearing structure is replaced by a transverse conveyor belt structure.

[0088] In some other embodiments, the tiltable support structure may also be replaced by other existing structures capable of carrying and exporting goods.

Claims

1. A fixed-point weighing sorting system, characterized by: It comprises a sorting machine track (2), a sorting trolley (4) and a weighing module (3); the sorting machine track (2) is provided with one or more weighing modules (3); the weighing module (3) comprises a weighing sensor (3-1) and a weighing track (3-3); the weighing track (3-3) is installed on the weighing sensor (3-1); The sorting trolley (4) comprises a frame (4-1), a passive lifting structure (4-3) and a cargo carrying structure; the passive lifting structure (4-3) comprises a lifting base (4-3-1), a connecting rod (4-3-2), a lifting bracket (4-3-3) and a lifting roller (4-3-4); the lifting base (4-3-1) is mounted on the frame (4-1); one end of the connecting rod (4-3-2) and the lifting base (4-3-1) form a rotating pair; the connecting rod (4-3- 2) and the other end thereof form a rotating pair with the lifting bracket (4-3-3); the lifting base (4-3-1), the lifting bracket (4-3-3) and at least two connecting rods (4-3-2) form a parallelogram mechanism; the cargo carrying structure is installed on the lifting bracket (4-3-3); the lifting roller (4-3-4) is installed on the lifting bracket (4-3-3) or the cargo carrying structure; the position of the lifting roller (4-3-4) matches the weighing track (3-3); When the sorting trolley (4) passes through the weighing module (3), the weighing track (3-3) provides support for the lifting bracket (4-3-3), the lifting roller (4-3-4), the cargo bearing structure, and the cargo transported by the sorting trolley (4), so that the weighing sensor (3-1) measures the weight of the cargo; The weighing module (3) further comprises a lifting guide rail (3-5); each weighing rail (3-3) corresponds to two lifting guide rails (3-5); the weighing rail (3-3) is located between the corresponding two lifting guide rails (3-5); the lifting guide rail (3-5) and the weighing rail (3-3) have the same height at their opposite ends; an inclined guide rail surface (3-5-1) is provided at the end of the top surface of the lifting guide rail (3-5) away from the weighing rail (3-3); the inclined guide rail surface (3-5-1) gradually decreases in a direction away from the weighing section; in an initial state, the bottom edge of the lifting roller (4-3-4) is lower than the top surface of the weighing rail (3-3) and higher than the lowest point of the inclined guide rail surface (3-5-1) on the lifting guide rail (3-5).

2. A fixed-point weighing sorting system according to claim 1, characterized in that: The vehicle frame (4-1) is provided with a support surface that matches the bottom of the lifting bracket (4-3-3); in an initial state, the lifting bracket (4-3-3) is supported on the support surface of the vehicle frame (4-1).

3. A fixed-point weighing sorting system according to claim 1, characterized in that: Lifting rollers (4-3-4) are rotatably mounted on both sides of the lifting bracket (4-3-3); two weighing tracks (3-3) located above the sorting machine track (2) are arranged at intervals in each weighing module (3); and the lifting rollers (4-3-4) on both sides of the lifting bracket (4-3-3) correspond to the positions of the two weighing tracks (3-3) in the weighing module (3).

4. A fixed-point weighing sorting system according to claim 3, characterized in that: The weighing module (3) further comprises a connecting bracket (3-2); the weighing sensor (3-1) is arranged below the sorting machine track (2); the connecting bracket (3-2) comprises a bottom connecting beam (3-2-1) and two supporting side plates (3-2-2); the bottom connecting beam (3-2-1) is fixed to the weighing sensor (3-1); the two ends of the bottom connecting beam (3-2-1) are respectively fixed to the bottoms of the two supporting side plates (3-2-2); the two supporting side plates (3-2-2) are respectively located on both sides of the sorting machine track (2); and the two weighing tracks (3-3) are respectively fixed to the tops of the opposite sides of the two supporting side plates (3-2-2).

5. A fixed-point weighing sorting system according to claim 1, characterized in that: When the lifting roller (4-3-4) is supported on the weighing track (3-3), the pulling direction of the connecting rod on the lifting bracket (4-3-3) is parallel to the horizontal plane.

6. A fixed-point weighing sorting system according to claim 1, characterized in that: The cargo carrying structure adopts a tilting plate carrying structure, comprising a flipping and resetting structure (4-4) and a pallet (4-5); the flipping and resetting structure (4-4) is installed on the top of the passive lifting structure (4-3); the pallet (4-5) is installed on the top of the flipping and resetting structure (4-4); the flipping and resetting structure (4-4) can lock the pallet (4-5) in a horizontal state, and can flip to the side after being unlocked.

7. A fixed-point weighing sorting system according to claim 1, characterized in that: The weighing module (3) is installed on the straight section of the sorting machine track (2).

8. A method for weighing goods in a sorting system, characterized in that: A sorting system with fixed-point weighing as claimed in claim 1 is used; the cargo weighing method of the sorting system is as follows: when the sorting trolley carrying the cargo moves along the sorting machine track (2) to the weighing module, the lifting roller (4-3-4) rises along the lifting guide track (3-5); when the lifting roller (4-3-4) reaches the weighing track (3-3), the lifting bracket (4-3-3), the lifting roller (4-3-4), the cargo carrying structure and the cargo are supported by the weighing track (3-3); the cargo weight is obtained according to the detection value of the weighing sensor (3-1).

9. A method for weighing goods in a sorting system according to claim 8, characterized in that: Cargo weight G s The expression is as follows: ； in, is the supporting force of the weighing track (3-3) measured by the weighing sensor (3-1); is the rolling friction coefficient between the lifting roller (4-3-4) and the weighing track (3-3); is the radius of the lifting roller; G1 is the total weight of the lifting bracket, lifting roller and cargo carrying structure; It is the angle between the pulling direction of the connecting rod on the lifting bracket (4-3-3) and the horizontal plane.

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