Automatic weighing device

Abstract

The utility model belongs to the technical field of weighing, and particularly relates to an automatic weighing device which comprises a conveyor belt used for conveying cement bags; the weighing device is arranged beside the conveying belt and used for weighing the cement bags; the transferring assembly is arranged opposite to the weighing device and used for transferring the cement bags from the conveying belt to the weighing device for weighing; the positioning sensor is positioned above the conveying belt; the reset assembly is installed on the side, away from the conveying belt, of the weighing device and used for resetting the cement bags which are weighed to be qualified to the conveying belt. The material control valve is installed on the weighing device and used for limiting the cement bags in the weighing process, and after weighing of the cement bags is not qualified, limiting is relieved so that the cement bags can automatically slide to a recycling area; when the positioning sensor monitors that the cement bag is conveyed to a weighing area, the controller controls the transferring assembly to transfer the cement bag to the weighing device to be weighed according to a preset program and receives weighing data of the weighing device, and the controller controls operation of the reset assembly or the material control valve according to the weighing data.

Description

Technical Field

[0001] This utility model belongs to the field of weighing technology, specifically relating to an automatic weighing device. Background Technology

[0002] Cement products must meet national or industry standards (such as GB 175-2023 "General Portland Cement"), which clearly stipulate the net content range for different packaging specifications (such as 50kg±1kg). Weighing ensures that the actual weight of each bag of cement conforms to the standard, avoiding reduced strength due to insufficient weight, which would affect the quality of the project. Therefore, as a basic material in the construction industry, weighing cement at the factory is a key step in ensuring product quality, compliance with regulations, and fair transactions.

[0003] Traditional cement bag weighing methods mainly rely on two technical approaches:

[0004] One method is to weigh directly on the conveyor belt: dynamic weighing is achieved by embedding a weighing module in the conveyor belt. Although this method is simple in structure and low in cost, it is easily affected by conveyor belt vibration, cement bag slippage and external interference, resulting in limited weighing accuracy and difficulty in automatically sorting out defective products.

[0005] The second method is manual assisted weighing: cement bags are manually transferred to an independent weighing platform, and after weighing, they are manually reset or defective products are rejected. Although this method can ensure weighing accuracy, it is inefficient, labor-intensive, and subject to the risk of human error, making it difficult to meet the needs of large-scale continuous production.

[0006] With the advancement of automation and intelligent upgrading in the cement industry, existing weighing technologies face the following bottlenecks:

[0007] 1. The contradiction between accuracy and efficiency: High-precision weighing requires a stable environment, but dynamic weighing of conveyor belts is difficult to eliminate vibration interference.

[0008] Second: Insufficient automation: Traditional solutions lack automatic identification and sorting functions for defective products, relying on manual intervention, which can easily lead to reduced production efficiency and quality risks.

[0009] To address the aforementioned issues, there is an urgent need to develop a high-precision, fully automated cement bag weighing device that can ensure weighing accuracy while automatically removing defective products and quickly resetting qualified products, thereby meeting the comprehensive demands of modern cement production for efficiency, quality, and intelligence. Utility Model Content

[0010] To address the above problems, the purpose of this utility model is to provide an automatic weighing device that solves the problems mentioned in the background art.

[0011] This utility model provides an automatic weighing device, including a conveyor belt for conveying cement bags; a weighing device disposed beside the conveyor belt for weighing the cement bags; a transfer component disposed opposite to the weighing device for transferring the cement bags from the conveyor belt to the weighing device for weighing; a positioning sensor located above the conveyor belt for monitoring whether the cement bags have reached the weighing area; a reset component installed on the side of the weighing device away from the conveyor belt for resetting the cement bags that have passed the weighing back onto the conveyor belt; a control valve installed on the weighing device for limiting the cement bags during the weighing process, and releasing the limit after the cement bags fail the weighing, allowing the cement bags to automatically slide into the recycling area; and a controller electrically connected to the weighing device, the transfer component, the positioning sensor, the reset component, and the control valve. When the positioning sensor detects that the cement bags have been conveyed to the weighing area, the controller controls the transfer component to transfer the cement bags to the weighing device for weighing according to a preset program, and receives the weighing data from the weighing device. The controller controls the operation of the reset component or the control valve based on the weighing data.

[0012] Preferably, the transfer assembly includes a first electric push rod, mounted on a support frame on one side of the conveyor belt frame; and a push plate, mounted on the end of the first electric push rod away from the support frame, for pushing the cement bag corresponding to the push plate onto the weighing device under the drive of the first electric push rod.

[0013] Preferably, it also includes a distance sensor mounted on the push plate, the distance sensor being used to monitor the distance from the push plate to the cement bag, the distance sensor being electrically connected to the controller, and the controller controlling the operation of the first electric push rod according to the distance signal monitored by the distance sensor.

[0014] Preferably, the material control valve includes a weighing platform disposed on the weighing device, the upper surface of which is an inclined slope; two baffles, respectively located at the lowest and highest ends of the weighing platform, for limiting the cement bag during the weighing process; a material control plate slidably connected to the baffle at the lowest end for controlling the opening and closing of the weighing platform's recovery port; and an electric telescopic rod installed on the baffle at the lowest end for driving the material control plate to slide up and down along the baffle. The electric telescopic rod is electrically connected to the controller. When the controller determines that the cement bag is not weighed properly, the controller controls the electric telescopic rod to open the recovery port, allowing the cement bag to slide down into the recovery area by its own weight.

[0015] Preferably, the reset assembly includes: a second electric push rod, mounted on a support plate connected to the bottom support platform of the weighing device; and a reset plate, fixedly mounted on the end of the second electric push rod, for resetting the weighed cement bags onto the conveyor belt under the drive of the second electric push rod.

[0016] Preferably, the second electric actuator is electrically connected to the controller, which controls the second electric actuator to travel the same distance as the first electric actuator.

[0017] The beneficial effects of this utility model are as follows: by setting up a transfer component, a positioning sensor, a reset component, and a material control valve, cement bags conveyed along the conveyor belt can be transferred to a weighing device for weighing. The cement bags are automatically classified according to the weighing data. Cement bags that pass the weighing are returned to the conveyor belt for conveying through the reset component, while cement bags that fail the weighing automatically slide down to the recycling area for further processing by their own weight. The entire weighing process has a high degree of automation, reducing the labor burden of workers. Attached Figure Description

[0018] Figure 1 This is a first-view structural diagram of the cement bag being conveyed along the conveyor belt to the weighing device according to the present invention.

[0019] Figure 2 This is a second-view structural diagram of the cement bag being conveyed along the conveyor belt to the weighing device according to the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the cement bag being conveyed along the conveyor belt to the weighing device according to the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the cement bag of this utility model, showing its transfer from the conveyor belt to the weighing device for weighing.

[0022] In the diagram: 1. Conveyor belt; 2. Weighing device; 3. Transfer assembly; 4. Positioning sensor; 5. Reset assembly; 6. Material control valve; 7. Controller; 8. First electric push rod; 9. Support frame; 10. Push plate; 11. Distance sensor; 12. Weighing platform; 13. Baffle; 14. Material control plate; 15. Electric telescopic rod; 16. Second electric push rod; 17. Support plate; 18. Reset plate. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0024] To address the problems encountered in traditional cement bag weighing methods, this invention employs the following technical solution: Figure 1-4As shown, an automatic weighing device includes a conveyor belt 1 for conveying cement bags; a weighing device 2 disposed on one side of the conveyor belt 1 for weighing the cement bags, the weighing accuracy of the weighing device 2 being ±0.1kg; a transfer assembly 3 disposed opposite to the weighing device 2, the transfer assembly 3 mainly including a first electric push rod 8 mounted on a support frame 9 on one side of the conveyor belt 1 frame and a push plate 10 mounted on the end of the first electric push rod 8 away from the support frame 9; and a material control valve 6 mounted on the weighing device 2, the material control valve 6 including a weighing platform 12 mounted on the top of the weighing device 2 with its upper surface being an inclined slope, and two valves respectively disposed at the lowest and highest points of the weighing platform 12. Baffle 13; a material control plate 14 slidably connected to the baffle 13 at the lowest end and used to control the opening and closing of the recovery port of the weighing platform 12; and an electric telescopic rod 15 installed on the baffle 13 at the lowest end and used to drive the material control plate 14 to slide up and down along the baffle 13; a reset assembly 5 installed on the side of the weighing device 2 away from the conveyor belt 1, the reset assembly 5 being used to reset the weighed and qualified cement bags onto the conveyor belt 1, the reset assembly 5 including a second electric push rod 16 installed on the support plate 17 connected to the bottom support platform of the weighing device 2 and a reset plate 18 fixedly installed at the end of the second electric push rod 16; and also including a positioning sensor 4 and a controller 7 (connected to the positioning sensor 4). (The positioning sensor 4, the first electric push rod 8, the second electric push rod 16, and the electric telescopic rod 15 are all electrically connected.) The positioning sensor 4 is installed above the conveyor belt 1 and is on the same straight line as the push plate 10 and the weighing device 2. The positioning sensor 4 can be an ultrasonic sensor. For example, the distance from the positioning sensor 4 to the surface of the conveyor belt 1 is 1 meter. When the cement bag is conveyed to the area below the positioning sensor 4, the distance detected by the positioning sensor 4 is less than 1 meter. At this time, the positioning sensor 4 transmits the distance signal to the controller 7. The controller 7 controls the first electric push rod 8 to run, driving the push plate 10 to push the cement bag that has reached the weighing area along the conveyor belt 1 onto the weighing device 2. The weighed data is then transmitted. The cement bag is handed to the controller 7. The controller 7 determines whether the weight of the cement bag is qualified according to the preset weight threshold. If it is lower or higher than the preset threshold, the controller 7 controls the electric telescopic rod 15 to run, so that the material control plate 14 slides upward along the slide rail of the baffle 13, opens the recycling port, and allows the cement bag to slide down the slope of the weighing platform 12 to the recycling area by its own weight. The slope angle of the weighing platform 12 can be controlled between 5° and 10° to facilitate the downward sliding of the cement bag under the action of gravity. If the weight of the cement bag is within the preset threshold range, the controller 7 controls the second electric push rod 16 to run, which drives the reset plate 18 to push the cement bag back onto the conveyor belt 1 for conveying.

[0025] Furthermore, such as Figure 1-4As shown, to facilitate control of the running distance of the first electric push rod 8 and the second electric push rod 16, a distance sensor 11 is installed on the push plate 10. This can be an ultrasonic distance sensor 11 or an infrared distance sensor 11. For example, in the initial state, the distance from the push plate 10 to the reset plate 18 is 2 meters, meaning the width of the conveyor belt 1 plus the weighing device 2 is 2 meters. If the width of the conveyor belt 1 is 1.5 meters and the width of the weighing device 2 is 0.5 meters, when the distance sensor 11 detects that the distance from the push plate 10 to the cement bag is 1 meter, the controller 7 controls the second electric push rod 16 to run approximately 0.5 meters according to a preset program, allowing the cement bag to reach the weighing device 2. Because the cement bag may slide on the weighing device 2 due to inertia, when the second electric push rod... After rod 16 travels 0.5 meters, the cement bag can be independently transferred to the weighing platform 12 without touching the reset plate 18, which has a certain space with the weighing device 2. To facilitate the smooth transfer of the cement bag to the weighing platform 12, the dimensions of both the weighing platform 12 and the weighing device 2 are larger than the dimensions of the cement bag. When the weight of the cement bag is qualified, the second electric push rod 16 also travels the same distance as the first electric push rod 8, i.e., 0.5 meters, so that the cement bag returns to the conveyor belt 1. However, in actual application, if the friction on the surface of the conveyor belt 1 is large or the running speed of the electric push rod is slow, the cement bag will not move forward due to inertia after being reset to the conveyor belt 1. The running speed of the second electric push rod 16 can also be adjusted accordingly, i.e., 0.6-0.8 meters.

[0026] Furthermore, such as Figure 1-2 As shown, in order to smoothly weigh and check each cement bag, a speed sensor can be installed on the drive equipment of conveyor belt 1. This speed sensor is used to monitor the conveying speed of conveyor belt 1. The controller 7 can determine the conveying speed of conveyor belt 1 based on the speed signal monitored by the speed sensor, and thus control and adjust the running speed of the first electric push rod 8, the second electric push rod 16, and the electric telescopic rod 15 accordingly. When the speed V of conveyor belt 1 increases, the speed V1 of the push rods is increased synchronously, that is, V1 = KV (K The proportional coefficient needs to be adjusted according to the actual working conditions to ensure that the material pushing speed matches the speed of conveyor belt 1, so as to avoid some cement bags being missed. The controller 7 can also be connected to a display module and an alarm module. The display module is used to display weighing data, equipment operating status and other information in real time. The alarm module is used to issue an audible and visual alarm signal when abnormal situations occur (such as the number of cement bags that fail to meet the preset threshold, equipment failure, etc.) to remind the operator to deal with it in time. Of course, in order to ensure the long-term stable operation of the system, during the application of this technical solution, it is also necessary to regularly calibrate and maintain the weighing device, push rod and telescopic rod and other equipment to overcome the possible decrease in accuracy or failure after long-term operation.

Claims

1. An automatic weighing device, characterized by: The cement bag weighing device comprises a conveying belt (1) for conveying cement bags, a weighing device (2) arranged beside the conveying path of the conveying belt (1) and used for weighing the cement bags, a transfer assembly (3) arranged opposite to the weighing device (2) and used for transferring the cement bags from the conveying belt (1) to the weighing device (2) for weighing, a positioning sensor (4) located above the conveying belt (1) and used for monitoring whether the cement bags reach the weighing area, a reset assembly (5) installed on the side of the weighing device (2) away from the conveying belt (1) and used for resetting the qualified cement bags on the conveying belt (1), a material control valve (6) installed on the weighing device (2) and used for limiting the cement bags during the weighing process and releasing the limitation to make the cement bags automatically slide to the recycling area when the cement bags are unqualified, and a controller (7) electrically connected with the weighing device (2), the transfer assembly (3), the positioning sensor (4), the reset assembly (5) and the material control valve (6), wherein when the positioning sensor (4) monitors that the cement bags are conveyed to the weighing area, the controller (7) controls the transfer assembly (3) to transfer the cement bags to the weighing device (2) for weighing according to a preset program, and receives the weighing data of the weighing device (2), and the controller (7) controls the operation of the reset assembly (5) or the material control valve (6) according to the weighing data. The transfer assembly (3) comprises a first electric push rod (8) installed on a support frame (9) on one side of the frame body of the conveying belt (1), and a push plate (10) installed on the end of the first electric push rod (8) away from the support frame (9) and used for driving the cement bags corresponding to the push plate (10) to the weighing device (2) under the drive of the first electric push rod (8). Further comprising a distance measuring sensor (11) installed on the push plate (10), wherein the distance measuring sensor (11) is used for monitoring the distance between the push plate (10) and the cement bags, the distance measuring sensor (11) is electrically connected with the controller (7), and the controller (7) controls the operation of the first electric push rod (8) according to the distance signal monitored by the distance measuring sensor (11). The material control valve (6) comprises a weighing table (12) arranged on the weighing device (2) and having an inclined slope surface on the upper surface, two baffle plates (13) respectively arranged at the lowest end and the highest end of the weighing table (12) and used for limiting the cement bags during the weighing process, a material control plate (14) slidingly connected on the baffle plate (13) at the lowest end and used for controlling the opening and closing of the recycling opening of the weighing table (12), and an electric telescopic rod (15) installed on the baffle plate (13) at the lowest end and used for driving the material control plate (14) to slide up and down along the baffle plate (13). The electric telescopic rod (15) is electrically connected with the controller (7), and when the controller (7) judges that the cement bags are unqualified, the controller (7) controls the electric telescopic rod (15) to open the recycling opening to make the cement bags slide to the recycling area by the self-gravity. The reset assembly (5) comprises a second electric push rod (16) installed on a support plate (17) connected to the bottom support platform of the weighing device (2). ​ ​ 2. An automatic weighing device according to claim 1, characterized in that: ​ ​ ​ 3. An automatic weighing apparatus according to claim 2, wherein: ​ 4. An automatic weighing device according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ 5. An automatic weighing apparatus according to claim 1, wherein: ​ ​ A reset plate (18) is fixedly installed at the end of the second electric push rod (16) and is used to reset the qualified cement bag to the conveying belt (1) under the driving of the second electric push rod (16).

6. An automatic weighing apparatus according to claim 5, wherein: The second electric push rod (16) is electrically connected with a controller (7), and the controller (7) controls the second electric push rod (16) to run the same distance according to the running distance of the first electric push rod (8).

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