High-speed high-precision instrument for weighing and force measurement

Abstract

The utility model discloses a high-speed high-precision instrument for weighing and force measurement, which comprises a front panel, a shell body arranged at the rear end of the front panel, a rear baffle arranged at the rear end of the shell body, the front panel and the rear baffle are locked at two ends of the body through screws, side edge strips are positioned on two sides of the shell body, a mainboard is arranged in the shell body, and a plurality of side edge strips are arranged on the mainboard. The mainboard is provided with a switching value circuit board through a fixing assembly, the front end of the mainboard is connected with a display board through a welding spot on the circuit board, and a circuit module is further arranged in the shell body. According to the utility model, the MCU singlechip processing circuit adopts a high-speed ARM (Advanced RISC Machines) kernel singlechip, the speed is improved through a combined filtering algorithm such as moving average and first-order filtering, the precision can reach 1 / 100000 at a low speed, sampling can reach 4800 times per second at a high speed, the highest communication speed can reach 921600 baud rate, and the MCU singlechip processing circuit can output to an upper computer through high-speed serial port communication; analog quantity output can be selected according to needs, and operation is simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of weighing and force measuring instruments, specifically a high-speed and high-precision instrument for weighing and force measurement. Background Technology

[0002] Weighing and force measuring instruments are commonly used in industrial weighing processes. They are widely used in data acquisition, signal transmission and conversion, and distributed weighing control systems and batching systems. They are mainly used in industries such as cement, concrete, glass, papermaking, plastics, chemicals, metallurgy, non-ferrous metals, cotton spinning, testing machines, 3C, automobile manufacturing, and new energy for the transmission, display, and detection of weighing signals for material level, weight load, tension, and tensile / compression.

[0003] However, existing instruments have certain shortcomings in actual use. When in use, the display accuracy of existing instruments is generally 1 / 30000 or 1 / 50000, and the speed is generally a few hundred times per second, which cannot meet the needs of some application scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a high-speed, high-precision instrument for weighing and force measurement, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-speed, high-precision instrument for weighing and force measurement, comprising a front panel, a housing body at the rear end of the front panel, a rear baffle at the rear end of the housing body, the front panel and the rear baffle being fastened to both ends of the housing body by screws, side drawers located on both sides of the housing body, a main board inside the housing body, a switch circuit board on the main board via a fixing component, a display board being soldered to the front end of the main board via solder joints on the circuit board, and a circuit module inside the housing body.

[0006] Preferably, the fixing component includes a copper pillar disposed between the switch circuit board and the main board, and both the top and bottom ends of the copper pillar are threaded with screws, and a bent steel strip is provided between the switch circuit board and the interior of the back baffle.

[0007] Preferably, the circuit module includes an MCU microcontroller processing circuit, and a filter and AD circuit are electrically connected to one side of the MCU microcontroller processing circuit. The sensor inputs the millivolt signal to the filter and AD circuit.

[0008] Preferably, the MCU microcontroller processing circuit is electrically connected to a storage circuit, a communication circuit, and an analog output circuit on one side.

[0009] Preferably, the other side of the MCU microcontroller processing circuit is electrically connected to a relay circuit, a transistor output circuit, and a transistor input circuit.

[0010] Preferably, one end of the MCU microcontroller processing circuit is electrically connected to a display circuit and a key scanning circuit.

[0011] Preferably, the circuit module also includes a power supply filter circuit, an analog power supply circuit, and a digital power supply circuit.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) The MCU microcontroller processing circuit in this instrument adopts a high-speed ARM core microcontroller and improves the speed through a combination of filtering algorithms such as sliding average and first-order filtering. It can also output to the host computer through high-speed serial communication. Analog output can also be selected as needed. At the same time, it is easy to operate and achieves high precision and high speed through adaptive software filtering algorithm. Attached Figure Description

[0014] Figure 1 This is one of the structural schematic diagrams of a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model;

[0015] Figure 2 This is the second structural schematic diagram of a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model.

[0017] Figure 4 This is a schematic diagram of the circuit module in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model.

[0018] Figure 5 This is a schematic diagram of the main board structure in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model;

[0019] Figure 6 This is a schematic diagram of the switching circuit board in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model.

[0020] Figure 7 This is a schematic diagram of the display panel in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model;

[0021] Figure 8 This is a schematic diagram of the analog output circuit in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model.

[0022] Figure 9 The circuit diagram of a relay DC load in a high-speed, high-precision instrument for weighing and force measurement proposed in this utility model;

[0023] Figure 10 The present invention provides a circuit diagram of a relay AC load in a high-speed, high-precision instrument for weighing and force measurement.

[0024] Figure 11 This invention presents a circuit diagram of a transistor output in a high-speed, high-precision instrument for weighing and force measurement.

[0025] Figure 12 This invention presents a circuit diagram of a transistor input in a high-speed, high-precision instrument for weighing and force measurement.

[0026] In the diagram: 1. Front panel; 2. Housing; 3. Rear panel; 4. Side strip; 5. Bending steel strip; 6. Screw; 7. Copper pillar; 8. Switch circuit board; 9. Main board; 10. Display board; 11. MCU microcontroller processing circuit; 12. Filtering and AD circuit; 13. Analog power supply circuit; 14. Storage circuit; 15. Communication circuit; 16. Digital power supply circuit; 17. Power supply filtering circuit; 18. Relay circuit; 19. Transistor output circuit; 20. Transistor input circuit; 21. Display circuit; 22. Key scanning circuit; 23. Analog output circuit; 24. Sensor. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1-8 This utility model provides an embodiment of a high-speed, high-precision instrument for weighing and force measurement, comprising a front panel 1, a housing 2 and a rear baffle 3 on one side of the rear end, which are fixedly connected by screws. An internal main board 9 is provided, which is connected to a switching circuit board 8 via a fixing assembly. The fixing assembly includes copper pillars 7 disposed between the switching circuit board 8 and the main board 9. A bent steel strip 5 is provided between the switching circuit board 8 and the interior of the rear baffle 3. The top and bottom ends of the copper pillars 7 are fastened by screws 6. The main board 9 has three round holes, h1, h2, and h3, and the switching circuit board 8 has round holes h4, h5, and h6 (e.g., h1, h2, h3). Figure 5 and Figure 6As shown), holes h1 and h6, h2 and h5, and h3 and h4 are respectively inserted into copper pillars 7 (with double-ended threads), which can be easily fixed by screws 6. The main board 9 and the display board 10 are connected by soldering pads on the circuit board. The switch circuit board 8 is connected to the pin header (a) on the main board 9 through the pin header (d) on the circuit board, connecting the circuits between the two circuit boards (e.g., Figure 5 and Figure 6 As shown), there are multiple openings at the rear baffle 3. The position and size of the openings are made according to the connectors on the main board 9 and the switch circuit board 8. The connectors are used to connect the external power supply, sensor 24, switch output, input, analog output and communication output, respectively.

[0029] Please see Figures 1-8 For the instrument body, there is an internal circuit module, mainly including MCU microcontroller processing circuit 11. The sensor 24 inputs the millivolt signal to the filter circuit and AD circuit 12 through the connector on the circuit board. The filter circuit + AD circuit 12 transmits the processed signal to MCU microcontroller processing circuit 11. One side of MCU microcontroller processing circuit 11 is electrically connected to storage circuit 14, communication circuit 15 and analog output circuit 23 respectively. The other side of MCU microcontroller processing circuit 11 is electrically connected to relay circuit 18, transistor output circuit 19 and transistor input circuit 20 respectively. One end of MCU microcontroller processing circuit 11 is electrically connected to display circuit 21 and key scanning circuit 22.

[0030] The millivolt signal from sensor 24 is converted into a digital signal inside the instrument through a filtering circuit, signal amplification, and AD circuit 12. Then, the signal is processed by the MCU microcontroller circuit 11, which performs software filtering, weight conversion, zeroing, tare, comparison judgment, peak and valley value detection, and other operations. Finally, it is output through the communication circuit 15 via the communication protocol, or converted into voltage and current signals through the analog output circuit 23. At the same time, the comparison judgment results and other alarm signals can also be directly output through the switch circuit (relay circuit 18 and transistor output circuit 19) to send the results to the host computer or control external alarm devices more quickly. Alternatively, external signals can be input through the transistor input circuit 20 to achieve internal zeroing, tare, and other functions. All operating parameters are stored in the storage circuit 14. The MCU displays the real-time force value, weight, and setting parameters through the display circuit 21. Users can also set and modify the internal data of the MCU through the key scanning circuit 22. Meanwhile, the digital power supply circuit 16 and the analog power supply circuit 13 power the entire hardware circuit.

[0031] The MCU microcontroller processing circuit in this instrument adopts a high-speed ARM core microcontroller and uses a combination of filtering algorithms such as moving average and first-order filtering to enable the instrument's internal speed to reach up to 4800 times per second. It can output to the host computer through high-speed serial communication (912600 baud rate). It also has RS485 and RS232 serial ports to meet the requirements of high precision and high speed. This instrument adopts a new high-precision Σ-Δ ADC and, through an adaptive software filtering algorithm, can achieve a display accuracy of 1 / 100000 at low speeds.

[0032] This instrument incorporates serial communication and analog-to-digital conversion programs in its MCU microcontroller processing circuit 11. The communication circuit 15 includes both RS485 and RS232 communication circuits. The instrument features both RS485 and RS232 serial ports. Pin headers e and f are soldered onto the analog circuit board, while pin headers b and c are soldered onto the main board 8. When the user requires analog output functionality, the analog circuit board is simply inserted into pin headers b and c via pin headers e and f. To minimize the instrument's size and reduce circuit board space, the digital circuit board 8 is designed as a separate board, allowing the two boards to be stacked. The digital circuit board 8 contains 5 transistor outputs, 2 relay outputs, and 4 transistor inputs. A 2x10 double-row pin header is located at point a on the main board 9, and a 2x10 double-row pin header is located at point d on the digital circuit board 8. By inserting the double-row pin headers at point d into the double-row pin headers at point a, the digital circuit board 8 and the main board 9 can be connected, forming a single unit. This instrument features both RS485 and RS232 serial ports, supporting Modbus RTU, ASCII, and free protocols. The two serial ports are independent, allowing simultaneous operation from two host computers. An analog module can be optionally added, supporting high-precision 16-bit analog output. Voltage and current outputs can be switched via software. It outputs standard analog signals such as 0–20mA, 4–20mA, 0–±5V, and 0–±10V. Multiple output speeds are available, including 10, 40, 80, 120, 200, 400, 600, 800, 1200, 1600, 2400, and 4800 times / second. The fastest speed of 4800 times / second can meet the needs of most users. The maximum baud rate is 921600bps, and the display accuracy can reach 1 / 100000 under low-speed, high-precision weighing conditions.

[0033] This instrument features multiple digital output circuits, allowing direct output of comparison results and alarm information. To use it, the comparison mode, data source, and comparison conditions are set within the instrument, and then the output ports are configured. The instrument has multiple output ports; after selecting one, the output port is connected to a PLC or other host computer. When the comparison conditions are met, the program controls the digital circuit and outputs a signal to the PLC or other host computer. Upon receiving the signal, the PLC or other host computer takes appropriate action. This instrument can use either relay or transistor outputs. For different devices, such as PLCs with signal inputs, transistors are more suitable due to their superior real-time performance. For devices like alarms and switches where voltage range is not critical, relay outputs are more convenient. Since relay outputs can connect to both DC and AC loads, they have a wider range of applications. The instrument has 5 transistor outputs and 2 relay outputs, along with transistor circuit 19 and relay circuit 18, meeting the user's needs for different digital outputs. Additionally, the instrument has 4 digital inputs 20, which can be zeroed or tare by providing external signals.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A high-speed, high-precision instrument for weighing and force measurement, comprising a front panel (1), characterized in that: The front panel (1) has a housing (2) at its rear end. The housing (2) has a rear baffle (3) at its rear end. The front panel (1) and the rear baffle (3) are fastened to both ends of the housing (2) by screws. Side drawers (4) are located on both sides of the housing (2). The housing (2) has a main board (9) inside. The main board (9) has a switch circuit board (8) through a fixing component. The front end of the main board (9) is electrically connected to a display board (10). The housing (2) also has a circuit module inside.

2. The high-speed, high-precision instrument for weighing and force measurement according to claim 1, characterized in that: The fixing component includes a copper pillar (7) disposed between the switch circuit board (8) and the main board (9), and the top and bottom ends of the copper pillar (7) are threaded with screws (6), and a bent steel strip (5) is provided between the switch circuit board (8) and the interior of the rear baffle (3).

3. A high-speed, high-precision instrument for weighing and force measurement according to claim 2, characterized in that: The circuit module includes an MCU microcontroller processing circuit (11), and a filter and AD circuit (12) is electrically connected to one side of the MCU microcontroller processing circuit (11). The sensor (24) inputs a millivolt signal to the filter and AD circuit (12).

4. A high-speed, high-precision instrument for weighing and force measurement according to claim 3, characterized in that: The MCU microcontroller processing circuit (11) is electrically connected to a storage circuit (14), a communication circuit (15), and an analog output circuit (23) on one side.

5. A high-speed, high-precision instrument for weighing and force measurement according to claim 4, characterized in that: The other side of the MCU microcontroller processing circuit (11) is electrically connected to a relay circuit (18), a transistor output circuit (19), and a transistor input circuit (20).

6. A high-speed, high-precision instrument for weighing and force measurement according to claim 5, characterized in that: One end of the MCU microcontroller processing circuit (11) is electrically connected to a display circuit (21) and a key scanning circuit (22).

7. A high-speed, high-precision instrument for weighing and force measurement according to claim 6, characterized in that: The circuit module also includes a power filter circuit (17), an analog power supply circuit (13), and a digital power supply circuit (16) to power the entire hardware circuit.

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