Intelligent answer sheet checking and counting device

Abstract

This application provides an intelligent answer sheet counting device, belonging to the field of office supplies technology. The device includes an LCD screen, a control board, buttons, a sensor module, and a motor module. The LCD screen, buttons, sensor module, and motor module are all connected to the control board. The LCD screen, connected to the control board, displays the number of sheets. The button module, connected to the control board, is used to start the counting process. The motor module, connected to the control board, is used for paper feeding. The sensor module, connected to the control board and installed in the paper path, monitors the status of the paper in the paper path in real time. By installing the sensor module in the paper path and connecting it to the control board, the device monitors the status of the paper in the paper path in real time, solving the problem of miscounting caused by the inability to determine whether the paper has actually moved forward in existing technologies, and realizing the confirmation of the valid passage status of each sheet of paper.

Description

Technical Field

[0001] This invention belongs to the field of office supplies technology, and in particular relates to an intelligent answer sheet counting device. Background Technology

[0002] With the continuous expansion of various paper-based examinations, the use of standardized answer sheets is growing exponentially. Examination management organizations need to complete multiple rounds of counting, including distribution, collection, and inventory verification, in the answer sheet circulation process. The number of sheets can easily reach tens of thousands, and zero errors are required. The traditional method of manually counting each sheet has become a bottleneck restricting the efficiency and security control of examination administration, and the industry's demand for automated batch counting equipment is becoming increasingly urgent.

[0003] To address scenarios involving large-volume paper counting, existing counting devices employ photoelectric sensors in conjunction with conveyor rollers: stacks of paper are placed into the paper feed channel, and the photoelectric sensors detect the obstruction signal generated by each sheet of paper as it passes through. The controller accumulates the number of obstructions and displays the result; simultaneously, the conveyor rollers continuously feed paper, achieving continuous counting. This solution can, to some extent, replace manual counting and meet basic counting functions.

[0004] The aforementioned device relies solely on a single photoelectric signal to trigger accumulation, making it unable to identify whether the paper has actually moved forward in the channel. When the paper temporarily stops due to static electricity or wrinkles while the sensor remains blocked, the system may misjudge that the paper feed has been completed and continue counting, resulting in a discrepancy between the displayed value and the actual quantity. Furthermore, if two sheets overlap, a single instance of obstruction may be counted repeatedly, also generating cumulative errors and leading to insufficient reliability of the counting results.

[0005] Therefore, the present invention provides an intelligent answer sheet counting device. Summary of the Invention

[0006] This invention provides an intelligent questionnaire counting device to at least solve the problem of insufficient reliability of counting results in the prior art.

[0007] This application provides an intelligent answer sheet counting device, which includes an LCD screen, a control board, a button module, a sensor module, and a motor module; the LCD screen, button module, sensor module, and motor module are all connected to the control board; The LCD screen is connected to the control board and is used to display the number of papers; the button module is connected to the control board and is used to start the counting; the motor module is connected to the control board and is used to feed the paper; the sensor module is connected to the control board and is installed in the paper path to monitor the status of the paper in the paper path. The sensor module includes a dual-sheet sensor, a first paper path sensor, and a second paper path sensor; the control board includes a microprocessor U12 and a memory chip U13.

[0008] Furthermore, the motor module includes a paper tray motor, a paper feed motor, a damping motor, and a paper feeding motor; The paper tray motor, paper feed motor, damping motor, and paper feeding motor are all connected to the control board.

[0009] Furthermore, the control board also includes a first PWM driver U6, a second PWM driver U7, a first motor driver U10, a second motor driver U11, a paper tray upper limit sensor interface J3, a paper tray lower limit sensor interface J2, a paper tray paper presence / absence sensor interface J12, a double sheet sensor interface J7, a first paper path sensor interface J1, a second paper path sensor interface J5, a first button interface J8, a second button interface J9, a paper tray motor interface J14, a paper feed motor interface J15, a damping motor interface J17, a paper feed motor interface J18, an LCD screen interface J10, and a power interface J13; Paper tray motor interface J14 is connected to the first PWM driver U6, and paper feed motor interface J15 is connected to the second PWM driver U7; the first PWM driver U6, the second PWM driver U7, the damping motor interface J17, the paper feed motor interface J18, the first motor driver U10, the second motor driver U11, the paper tray upper limit sensor interface J3, the paper tray lower limit sensor interface J2, the paper tray paper presence / absence sensor interface J12, the double sheet sensor interface J7, the first paper path sensor interface J1, the second paper path sensor interface J5, the first button interface J8, the second button interface J9, the LCD screen interface J10, the storage chip U13, and the power interface J13 are all connected to the microprocessor U12; Pin 1 of the power interface J13 is connected to +3.3V and connected to the VCC pin; pin 2 of the power interface J13 is connected to +5V; pin 3 of the power interface J13 is connected to +24V; and pin 4 of the power interface J13 is grounded.

[0010] Furthermore, the sensor module also includes a paper tray upper limit sensor, a paper tray lower limit sensor, and a paper tray presence / absence sensor; The paper hopper upper limit sensor is connected to the control board via the paper hopper upper limit sensor interface J3. The paper bin lower limit sensor is connected to the control board via the paper bin lower limit sensor interface J2; The paper tray paper presence / absence sensor is connected to the control board via the paper tray paper presence / absence sensor interface J12; The dual-sheet sensor is connected to the control board via the dual-sheet sensor interface J7. The first paper path sensor is connected to the control board via the first paper path sensor interface J1; The second paper path sensor is connected to the control board via the second paper path sensor interface J5.

[0011] Furthermore, the D0 pin of memory chip U13 is connected to the D0 pin of microprocessor U12, the D1 pin of memory chip U13 is connected to the D1 pin of microprocessor U12, the D2 pin of memory chip U13 is connected to the D2 pin of microprocessor U12, the D3 pin of memory chip U13 is connected to the D3 pin of microprocessor U12, the D4 pin of memory chip U13 is connected to the D4 pin of microprocessor U12, the D5 pin of memory chip U13 is connected to the D5 pin of microprocessor U12, the D6 pin of memory chip U13 is connected to the D6 pin of microprocessor U12, and the D7 pin of memory chip U13 is connected to the D7 pin of microprocessor U12. Pin D8 of memory chip U13 is connected to pin D8 of microprocessor U12; pin D9 of memory chip U13 is connected to pin D9 of microprocessor U12; pin D10 of memory chip U13 is connected to pin D10 of microprocessor U12; pin D11 of memory chip U13 is connected to pin D11 of microprocessor U12; pin D12 of memory chip U13 is connected to pin D12 of microprocessor U12; pin D13 of memory chip U13 is connected to pin D13 of microprocessor U12; pin D14 of memory chip U13 is connected to pin D14 of microprocessor U12; and pin D15 of memory chip U13 is connected to pin D15 of microprocessor U12. The A0 pin of memory chip U13 is connected to the A0 pin of microprocessor U12; the A1 pin of memory chip U13 is connected to the A1 pin of microprocessor U12; the A2 pin of memory chip U13 is connected to the A2 pin of microprocessor U12; the A3 pin of memory chip U13 is connected to the A3 pin of microprocessor U12; the A4 pin of memory chip U13 is connected to the A4 pin of microprocessor U12; the A5 pin of memory chip U13 is connected to the A5 pin of microprocessor U12; the A6 pin of memory chip U13 is connected to the A6 pin of microprocessor U12; the A7 pin of memory chip U13 is connected to the A7 pin of microprocessor U12; the memory chip U1... Pin A8 of memory chip U13 is connected to pin A8 of microprocessor U12; pin A9 of memory chip U13 is connected to pin A9 of microprocessor U12; pin A10 of memory chip U13 is connected to pin A10 of microprocessor U12; pin A11 of memory chip U13 is connected to pin A11 of microprocessor U12; pin A12 of memory chip U13 is connected to pin A12 of microprocessor U12; pin A13 of memory chip U13 is connected to pin A13 of microprocessor U12; pin A14 of memory chip U13 is connected to pin A14 of microprocessor U12; and pin A15 of memory chip U13 is connected to pin A15 of microprocessor U12. The / RD pin of the memory chip U13 is connected to the / RD pin of the microprocessor U12; the / WE pin of the memory chip U13 is connected to the / WE pin of the microprocessor U12; the / DS pin of the memory chip U13 is connected to the / DS pin of the microprocessor U12; pins 12, 34, 39 and 40 of the memory chip U13 are all grounded, and pins 11 and 33 of the memory chip U13 are connected to VCC.

[0012] Further, the IOPB0 pin of the first PWM driver U6 is connected to the IOPB0 pin of the microprocessor U12; the IOPA7 pin of the first PWM driver U6 is connected to the IOPA7 pin of the microprocessor U12; the IOPE1 pin of the first PWM driver U6 is connected to the IOPE1 pin of the microprocessor U12; the IOPB0 pin of the first PWM driver U6 is grounded through resistor R27; the IOPA7 pin of the first PWM driver U6 is grounded through resistor R23; the IOPE1 pin of the first PWM driver U6 is connected to a 5V voltage through resistor R25; the first P The GND pin of the first PWM driver U6 is grounded; the VS pin of the first PWM driver U6 is connected to +M24V voltage; the VSS pin of the first PWM driver U6 is connected to 5V voltage and then grounded through capacitor C9; the OUT1 and OUT4 pins of the first PWM driver U6 are connected to pin 2 of the paper tray motor interface J14 and grounded in reverse through diode D6, and connected to +M24V voltage in forward through diode D1; the OUT2 and OUT3 pins of the first PWM driver U6 are connected to pin 1 of the paper tray motor interface J14 and grounded in reverse through diode D5, and connected to +M24V voltage in forward through diode D2. The IOPB1 pin of the second PWM driver U7 is connected to the IOPB1 pin of the microprocessor U12; the IOPA6 pin of the second PWM driver U7 is connected to the IOPA6 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is connected to the IOPE5 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is grounded through resistor R32; the IOPA6 pin of the second PWM driver U7 is grounded through resistor R30; the IOPB1 pin of the second PWM driver U7 is connected to a 5V voltage through resistor R31. The GND pin of the second PWM driver U7 is grounded; the VS pin of the second PWM driver U7 is connected to +M24V voltage; the VSS pin of the second PWM driver U7 is connected to 5V voltage and then grounded through C11; the OUT1 and OUT4 pins of the second PWM driver U7 are connected to pin 2 of the paper feed motor interface J15 and then grounded in reverse through diode D8, and connected to +M24V voltage in forward through diode D3; the OUT2 and OUT3 pins of the second PWM driver U7 are connected to pin 1 of the paper feed motor interface J15 and then grounded in reverse through diode D7, and connected to +M24V voltage in forward through diode D4. The G pin of the first motor driver U10 is connected to the IOPB2 pin of the microprocessor U12 and grounded through resistor R33; the S pin of the first motor driver U10 is grounded; the D pin of the first motor driver U10 is connected to the 2 pin of the damping motor interface J17, and the 1 pin of the damping motor interface J17 is connected to the +M24V voltage. The G pin of the second motor driver U11 is connected to the IOPB3 pin of the microprocessor U12 and grounded through resistor R34; the S pin of the second motor driver U11 is grounded; the D pin of the second motor driver U11 is connected to pin 2 of the paper feed motor interface J18, and pin 1 of the paper feed motor interface J18 is connected to +M24V voltage.

[0013] Furthermore, pin 2 of the paper tray upper limit sensor interface J3 is connected to pin ADIN11 of the microprocessor U12 and is connected to +3.3V voltage through resistor R1. Pin 1 of the paper tray upper limit sensor interface J3 is grounded, and pin 3 of the paper tray upper limit sensor interface J3 is connected to +3.3V voltage. Pin 2 of the lower limit sensor interface J2 of the paper bin is connected to pin ADIN03 of the microprocessor U12, pin 1 of the upper limit sensor interface J3 of the paper bin is grounded through resistor R9, and pin 3 of the upper limit sensor interface J3 of the paper bin is connected to a +3.3V voltage. Pin 3 of the first paper path sensor interface J1 is connected to pin ADIN12 of the microprocessor U12, pin 1 of the paper tray upper limit sensor interface J3 is grounded through resistor R2, and pins 2 and 4 of the first paper path sensor interface J1 are connected to a +3.3V voltage. Pin 2 of the dual-sheet sensor interface J7 is connected to pin ADIN04 of the microprocessor U12, pin 1 of the dual-sheet sensor interface J7 is grounded through resistor R5, and pin 3 of the dual-sheet sensor interface J7 is connected to a +3.3V voltage. Pin 3 of the second paper path sensor interface J5 is connected to pin ADIN09 of microprocessor U12, pin 1 of the second paper path sensor interface J5 is grounded through resistor R3, and pins 2 and 4 of the second paper path sensor interface J5 are connected to +3.3V voltage. Pin 2 of the paper tray paper presence / absence sensor interface J12 is connected to pin ADIN06 of the microprocessor U12. Pin 1 of the paper tray paper presence / absence sensor interface J12 is grounded through resistor R14. Pin 3 of the paper tray paper presence / absence sensor interface J12 is connected to a +3.3V voltage.

[0014] Furthermore, the button module includes a first button and a second button; both the first button and the second button are connected to the control board. Among them, pins 3 and 4 of the first button interface J8 are connected to pin ADIN07 of microprocessor U12 and grounded through resistor R6. Pin 1 of the first button interface J8 is grounded and pin 2 of the first button interface J8 is connected to +3.3V voltage. Pins 3 and 4 of the second button interface J9 are connected to pin ADIN15 of the microprocessor U12 and grounded through resistor R7. Pin 1 of the second button interface J9 is grounded, and pin 2 of the first button interface J8 is connected to +3.3V.

[0015] Furthermore, pin 3 of the LCD screen interface J10 is connected to pin IOPF0 of the microprocessor U12 and is connected to +3.3V voltage through resistor R50. Pin IOPA3 of the microprocessor U12 is connected to pin 4 of the LCD screen interface J10 and is connected to +3.3V voltage through resistor R51. Pin 2 of the LCD screen interface J10 is grounded, and pin 1 of the LCD screen interface J10 is connected to +3.3V voltage. The control board also includes an emulator interface U14; Pin 2 of the emulator interface U14 is connected to pin 1 of the microprocessor U12. Pin 1 of the emulator interface U14 is connected to pin 144 of the microprocessor U12. Pin 7 of the emulator interface U14 is connected to pin 142 of the microprocessor U12. Pin 3 of the emulator interface U14 is connected to pin 139 of the microprocessor U12. Pins 11 and 9 of the emulator interface U14 are both connected to pin 135 of the microprocessor U12. Pin 14 of the emulator interface U14 is connected to pin 91 of the microprocessor U12. Pin 13 of the emulator interface U14 is connected to pin 90 of the microprocessor U12.

[0016] Furthermore, the dual-sheet sensor detects the signal as the paper passes through the paper path and outputs the dual-sheet detection signal to the microprocessor U12; The microprocessor U12 receives the double-sheet detection signal and compares it with a preset threshold in the storage chip U13 to determine whether the paper is a single sheet. If it is determined that the paper feed is not a single sheet, the microprocessor U12 will control the interruption of the paper feed and trigger an alarm; If it is determined that a single sheet has passed, the paper continues to move, triggering the first paper path sensor and the second paper path sensor in sequence; The microprocessor U12 monitors the trigger signal sequence of the first paper path sensor and the second paper path sensor in real time, including the trigger sequence and the trigger time difference; Based on the signal sequence, the microprocessor U12 determines whether the paper is moving normally; If the movement is determined to be normal, the microprocessor U12 performs a counting operation and updates the display; If an abnormal stoppage is detected, the microprocessor U12 will control the paper feed to pause and trigger an alarm.

[0017] As can be seen from the above technical solutions, the present invention has the following advantages: The intelligent answer sheet counting device provided in this application uses a sensor module installed in the paper path and connected to the control board to monitor the status of the paper in the paper path in real time. This solves the problem of miscounting caused by the inability to determine whether the paper has actually moved forward in the prior art, and realizes the confirmation of the effective passage status of each sheet of paper.

[0018] In this application, the motor module is connected to the control board for paper feeding, which solves the problem that the paper is prone to stagnation due to the lack of continuous and controllable power in the prior art, causing continuous obstruction of the sensor. It realizes controllable pushing of the paper feeding process, which can ensure that the paper passes through the monitoring area at a predetermined rhythm and avoids counting deviation caused by stagnation.

[0019] In this application, the button module is connected to the control board to start the counting, which solves the problem in the prior art that the count is automatically accumulated upon power-on and the operator cannot trigger the counting independently based on the actual paper loading status. The counting is started after the paper loading is completed, preventing the error in the base count caused by misreading the tattered sheets or debugging signals during the initialization stage.

[0020] In this application, the LCD screen is connected to the control board to display the number of papers, which solves the problem that the existing technology only provides background data and on-site personnel cannot intuitively know the number of papers counted in real time. It realizes the visualization of the counting process, allowing operators to check at any time whether the number of papers sent is consistent with the expected number, and promptly detect abnormalities and stop the machine for inspection. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the intelligent answer sheet counting device of the present invention.

[0023] Figure 2 This is a structural diagram of the intelligent answer sheet counting device of the present invention.

[0024] Figure 3 This is a circuit diagram of the microprocessor U12 in the intelligent answer sheet counting device of the present invention.

[0025] Figure 4 The circuit diagram shows the storage chip U13 of the intelligent answer sheet counting device of the present invention.

[0026] Figure 5 This is a circuit diagram of the motor interface of the intelligent answer sheet counting device of the present invention.

[0027] Figure 6 This is a circuit diagram of the sensor interface of the intelligent answer sheet counting device of the present invention.

[0028] Figure 7 The circuit diagram shows the button interface of the intelligent answer sheet counting device of the present invention.

[0029] Figure 8 The circuit diagram is for the LCD screen interface J10 of the intelligent answer sheet counting device of the present invention.

[0030] Figure 9 The circuit diagram is for the power interface J13 of the intelligent answer sheet counting device of the present invention.

[0031] Attached reference numerals: 1-LCD screen, 2-control board, 3-button module, 4-sensor module, 5-motor module, 6-paper feed tray, 7-paper receiving tray. Detailed Implementation

[0032] To make the purpose, features, and advantages of this application more apparent and understandable, specific embodiments and accompanying drawings will be used to clearly and completely describe the technical solution protected by this application. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] This application provides an intelligent answer sheet counting device, which solves the current urgent technical problem of achieving reliable counting results.

[0034] The technical solutions proposed in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic block diagram of an intelligent answer sheet counting device provided in an embodiment of this application. Figure 1 As shown in the figure, an intelligent answer sheet counting device provided in this application embodiment includes an LCD screen 1, a control board 2, a button module 3, a sensor module 4, and a motor module 5; the LCD screen 1, button module 3, sensor module 4, and motor module 5 are all connected to the control board 2; The LCD screen 1 is connected to the control board 2 and is used to display the number of papers; the button module 3 is connected to the control board 2 and is used to start the counting; the motor module 5 is connected to the control board 2 and is used to feed the paper; the sensor module 4 is connected to the control board 2 and is installed in the paper path to monitor the status of the paper in the paper path.

[0036] The sensor module 4 includes a dual-sheet sensor 44, a first paper path sensor 45, and a second paper path sensor 46; the control board 2 includes a microprocessor U12 and a memory chip U13.

[0037] Specifically, after the user places the answer sheet into the paper tray, the paper tray presence sensor 41 connects to the control board 2 via the paper tray presence sensor interface J12 to detect the presence of paper. If paper is detected, a signal is sent to the microprocessor U12 via the ADIN06 pin. The microprocessor then drives the paper tray motor 51 via the paper tray motor interface J14 to adjust the paper tray position, ensuring the paper is in place.

[0038] The upper limit sensor 41 monitors the paper tray height through the upper limit sensor interface J3, and the lower limit sensor 42 monitors the paper tray height through the lower limit sensor interface J2 to prevent the paper from being stacked too high or too low. The microprocessor U12 optimizes the start-up timing of the paper feed motor 52 based on these signals.

[0039] When the operator presses the button module (either the first or second button, connected via interfaces J8 and J9), the microprocessor U12 receives the start signal and controls the paper feed motor 52 (driven via interface J15) to push the paper sheets one by one into the paper path.

[0040] The paper feed motor 54 (driven via interface J18) and the damping motor 53 (driven via interface J17) work together to ensure that the paper passes through the monitoring area at a constant speed, avoiding sensor misreading due to speed fluctuations.

[0041] Combination Figure 2 The paper tray motor 51 is located on the paper inlet side of the equipment, the paper feed motor 52 is located near the paper feed roller, the damping motor 53 is located near the damping roller, and the paper feed motor 54 is located near the paper path.

[0042] After the paper enters the paper path, it first passes through the dual-sheet sensor 44. The dual-sheet sensor 44 is a through-beam photoelectric sensor composed of an IR204-A and a PT204-6B. The dual-sheet sensor 44 is connected to the microprocessor U12 via the dual-sheet sensor interface J7. When the paper thickness is abnormal, the output signal amplitude changes. The microprocessor U12 acquires the signal through the ADIN04 pin and compares it with a preset threshold in the memory chip U13. Single sheet passed: The signal is within the standard range, and counting continues.

[0043] Double sheet overlap: When the signal exceeds the threshold, the microprocessor U12 immediately interrupts all motors, and the LCD screen displays "Double sheet error". Operator intervention is required to restart.

[0044] As the paper moves forward, it first triggers the first paper path sensor 45, and then triggers the second paper path sensor 46. The microprocessor U12 monitors the signal sequence of the first paper path sensor 45 and the second paper path sensor 46 in real time via the ADIN12 and ADIN09 pins. Normal movement: After the first sensor 45 is triggered, the second sensor 46 is triggered within a predetermined time difference. The microprocessor U12 determines that the movement is valid and increments the count by 1.

[0045] Abnormal Stall: If only the first sensor 45 is continuously blocked or the signal interval is too long, the microprocessor U12 determines that the paper is stuck, immediately stops the paper feed motor 54, and displays an alarm on the LCD screen 1.

[0046] The valid count results are displayed on LCD screen 1 in real time. The microprocessor U12 updates the count each time a valid sheet is confirmed. The paper finally falls into the paper receiving tray, completing the count.

[0047] The LCD screen 1 is connected to the control board 2 via the LCD screen interface J10 and is used to display the number of papers. The button module 3 is connected to the control board 2 via the first button interface J8 and the second button interface J9, and is used to manually input commands to start the counting. The motor module 5 is connected to the control board 2 via the paper tray motor interface J14, the paper feed motor interface J15, the damping motor interface J17, the paper feed motor interface J18, the first PWM driver U6, the second PWM driver U7, the first motor driver U10, and the second motor driver U11, and is used for paper feeding. The sensor module 4 is connected to the control board 2 through the upper limit sensor interface J3, the lower limit sensor interface J2, the paper presence / absence sensor interface J12, the double sheet sensor interface J7, the first paper path sensor interface J1, and the second paper path sensor interface J5, and is installed in the paper path to monitor the state of the paper in the paper path.

[0048] In an exemplary embodiment, the motor module 5 includes a paper tray motor 51, a paper feed motor 52, a damping motor 53, and a paper feed motor 54; The paper tray motor 51, paper feed motor 52, damping motor 53, and paper feed motor 54 are all connected to the control board 2.

[0049] According to an embodiment of this application, the control board 2 further includes a first PWM driver U6, a second PWM driver U7, a first motor driver U10, a second motor driver U11, a paper tray upper limit sensor interface J3, a paper tray lower limit sensor interface J2, a paper tray paper presence / absence sensor interface J12, a double sheet sensor interface J7, a first paper path sensor interface J1, a second paper path sensor interface J5, a first button interface J8, a second button interface J9, a paper tray motor interface J14, a paper feed motor interface J15, a damping motor interface J17, a paper feed motor interface J18, an LCD screen interface J10, and a power interface J13. Paper tray motor interface J14 is connected to the first PWM driver U6, and paper feed motor interface J15 is connected to the second PWM driver U7; the first PWM driver U6, the second PWM driver U7, the damping motor interface J17, the paper feed motor interface J18, the first motor driver U10, the second motor driver U11, the paper tray upper limit sensor interface J3, the paper tray lower limit sensor interface J2, the paper tray paper presence / absence sensor interface J12, the double sheet sensor interface J7, the first paper path sensor interface J1, the second paper path sensor interface J5, the first button interface J8, the second button interface J9, the LCD screen interface J10, the storage chip U13, and the power interface J13 are all connected to the microprocessor U12; Combination Figure 9 The power interface J13 has pin 1 connected to +3.3V and connected to the VCC pin, pin 2 connected to +5V, pin 3 connected to +24V, and pin 4 grounded.

[0050] An external power supply is connected to the control board 2 via a power interface J13 to provide the necessary power to the control board 2.

[0051] Specifically, in combination Figure 3 The VSSO, VSS, VSSA, and VREFLO pins of the microprocessor U12 are all grounded. The VDD, VDDO, PLLVCCA, VCCA, and VREFHI pins of the microprocessor U12 are all connected to VCC. The VCCP (5V) pin of the microprocessor U12 is connected to +5V.

[0052] The PLLF pin of the microprocessor U12 is connected to capacitor C24 and resistor R35. The PLLF2 pin of the microprocessor U12 is connected to capacitor C23 and the other end of capacitor C24. The other end of R35 is connected to the other end of capacitor C23.

[0053] Pins 90, 91, 120, 121, and 122 of the microprocessor U12 are connected to VCC via resistors R39, R40, R41, R45, and R42, respectively. Pin 118 of the microprocessor U12 is grounded via resistor R46.

[0054] The microprocessor U12 has pins 123 connected to pin 3 of crystal oscillator Y1. Pin 4 of crystal oscillator Y1 is connected to capacitor C34 and inductor FB5 respectively. The other end of capacitor C34 is grounded and the other end of inductor FB5 is connected to VCC.

[0055] In this embodiment, the microprocessor U12 adopts the integrated circuit TMS320LF2407A.

[0056] According to yet another embodiment of the present invention, in combination with Figure 4 The D0 pin of memory chip U13 is connected to the D0 pin of microprocessor U12; the D1 pin of memory chip U13 is connected to the D1 pin of microprocessor U12; the D2 pin of memory chip U13 is connected to the D2 pin of microprocessor U12; the D3 pin of memory chip U13 is connected to the D3 pin of microprocessor U12; the D4 pin of memory chip U13 is connected to the D4 pin of microprocessor U12; the D5 pin of memory chip U13 is connected to the D5 pin of microprocessor U12; the D6 pin of memory chip U13 is connected to the D6 pin of microprocessor U12; the D7 pin of memory chip U13 is connected to the D7 pin of microprocessor U12; the memory chip U13... Pin D8 of memory chip U13 is connected to pin D8 of microprocessor U12; pin D9 of memory chip U13 is connected to pin D9 of microprocessor U12; pin D10 of memory chip U13 is connected to pin D10 of microprocessor U12; pin D11 of memory chip U13 is connected to pin D11 of microprocessor U12; pin D12 of memory chip U13 is connected to pin D12 of microprocessor U12; pin D13 of memory chip U13 is connected to pin D13 of microprocessor U12; pin D14 of memory chip U13 is connected to pin D14 of microprocessor U12; pin D15 of memory chip U13 is connected to pin D15 of microprocessor U12. The A0 pin of memory chip U13 is connected to the A0 pin of microprocessor U12; the A1 pin of memory chip U13 is connected to the A1 pin of microprocessor U12; the A2 pin of memory chip U13 is connected to the A2 pin of microprocessor U12; the A3 pin of memory chip U13 is connected to the A3 pin of microprocessor U12; the A4 pin of memory chip U13 is connected to the A4 pin of microprocessor U12; the A5 pin of memory chip U13 is connected to the A5 pin of microprocessor U12; the A6 pin of memory chip U13 is connected to the A6 pin of microprocessor U12; the A7 pin of memory chip U13 is connected to the A7 pin of microprocessor U12; the memory chip U1... Pin A8 of memory chip U13 is connected to pin A8 of microprocessor U12; pin A9 of memory chip U13 is connected to pin A9 of microprocessor U12; pin A10 of memory chip U13 is connected to pin A10 of microprocessor U12; pin A11 of memory chip U13 is connected to pin A11 of microprocessor U12; pin A12 of memory chip U13 is connected to pin A12 of microprocessor U12; pin A13 of memory chip U13 is connected to pin A13 of microprocessor U12; pin A14 of memory chip U13 is connected to pin A14 of microprocessor U12; and pin A15 of memory chip U13 is connected to pin A15 of microprocessor U12. The / RD pin of the memory chip U13 is connected to the / RD pin of the microprocessor U12; the / WE pin of the memory chip U13 is connected to the / WE pin of the microprocessor U12; the / DS pin of the memory chip U13 is connected to the / DS pin of the microprocessor U12; pins 12, 34, 39 and 40 of the memory chip U13 are all grounded, and pins 11 and 33 of the memory chip U13 are connected to VCC.

[0057] In this embodiment, the memory chip U13 is an IS61LV6416L.

[0058] In one embodiment, combined Figure 5The IOPB0 pin of the first PWM driver U6 is connected to the IOPB0 pin of the microprocessor U12; the IOPA7 pin of the first PWM driver U6 is connected to the IOPA7 pin of the microprocessor U12; the IOPE1 pin of the first PWM driver U6 is connected to the IOPE1 pin of the microprocessor U12; the IOPB0 pin of the first PWM driver U6 is grounded through resistor R27; the IOPA7 pin of the first PWM driver U6 is grounded through resistor R23; the IOPE1 pin of the first PWM driver U6 is connected to a 5V voltage through resistor R25; the first PWM... The GND pin of driver U6 is grounded; the VS pin of the first PWM driver U6 is connected to +M24V voltage; the VSS pin of the first PWM driver U6 is connected to 5V voltage and then grounded through capacitor C9; the OUT1 and OUT4 pins of the first PWM driver U6 are connected to pin 2 of the paper tray motor interface J14 and grounded in reverse through diode D6, and connected to +M24V voltage in forward through diode D1; the OUT2 and OUT3 pins of the first PWM driver U6 are connected to pin 1 of the paper tray motor interface J14 and grounded in reverse through diode D5, and connected to +M24V voltage in forward through diode D2. The IOPB1 pin of the second PWM driver U7 is connected to the IOPB1 pin of the microprocessor U12; the IOPA6 pin of the second PWM driver U7 is connected to the IOPA6 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is connected to the IOPE5 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is grounded through resistor R32; the IOPA6 pin of the second PWM driver U7 is grounded through resistor R30; the IOPB1 pin of the second PWM driver U7 is connected to a 5V voltage through resistor R31. The GND pin of the second PWM driver U7 is grounded; the VS pin of the second PWM driver U7 is connected to +M24V voltage; the VSS pin of the second PWM driver U7 is connected to 5V voltage and then grounded through C11; the OUT1 and OUT4 pins of the second PWM driver U7 are connected to pin 2 of the paper feed motor interface J15 and then grounded in reverse through diode D8, and connected to +M24V voltage in forward through diode D3; the OUT2 and OUT3 pins of the second PWM driver U7 are connected to pin 1 of the paper feed motor interface J15 and then grounded in reverse through diode D7, and connected to +M24V voltage in forward through diode D4. The G pin of the first motor driver U10 is connected to the IOPB2 pin of the microprocessor U12 and grounded through resistor R33; the S pin of the first motor driver U10 is grounded; the D pin of the first motor driver U10 is connected to the 2 pin of the damping motor interface J17, and the 1 pin of the damping motor interface J17 is connected to the +M24V voltage. The G pin of the second motor driver U11 is connected to the IOPB3 pin of the microprocessor U12 and grounded through resistor R34; the S pin of the second motor driver U11 is grounded; the D pin of the second motor driver U11 is connected to pin 2 of the paper feed motor interface J18, and pin 1 of the paper feed motor interface J18 is connected to +M24V voltage.

[0059] In this embodiment, the paper tray motor and paper feed motor are DC24-XC38MS64, and the damping motor and paper feed motor are GA25-2485.

[0060] Paper tray motor 51 is connected to control board 2 via paper tray motor interface J14; paper feed motor 52 is connected to control board 2 via paper feed motor interface J15; damping motor 53 is connected to control board 2 via damping motor interface J17; paper feed motor 54 is connected to control board 2 via paper feed motor interface J18.

[0061] Specifically, the microprocessor U12 is connected to the first PWM driver U6 via the IOPB0 pin, IOPA7 pin and IOPE1 pin. The first PWM driver U6 is connected to a paper tray motor interface J14, which is used to connect the paper tray motor 51. The microprocessor U12 controls the paper tray motor 51 through the first PWM driver U6 and the paper tray motor interface J14.

[0062] In this embodiment, the first PWM driver U6 and the second PWM driver U7 both adopt the PWM driver L298P, and the first motor driver U10 and the second motor driver U11 both adopt the driver SI9804.

[0063] As an example, combined Figure 6 The sensor module 4 includes a paper tray upper limit sensor 41, a paper tray lower limit sensor 42, a paper tray paper presence sensor 43, a double sheet sensor 44, a first paper path sensor 45, and a second paper path sensor 46. The paper tray upper limit sensor 41 is connected to the control board 2 via the paper tray upper limit sensor interface J3; The paper bin lower limit sensor 42 is connected to the control board 2 via the paper bin lower limit sensor interface J2; The paper tray paper presence / absence sensor 43 is connected to the control board 2 via the paper tray paper presence / absence sensor interface J12; The dual-sheet sensor 44 is connected to the control board 2 via the dual-sheet sensor interface J7; The first paper path sensor 45 is connected to the control board 2 through the first paper path sensor interface J1; The second paper path sensor 46 is connected to the control board 2 via the second paper path sensor interface J5.

[0064] It should be further noted that pin 2 of the paper tray upper limit sensor interface J3 is connected to pin ADIN11 of the microprocessor U12 and is connected to +3.3V voltage through resistor R1. Pin 1 of the paper tray upper limit sensor interface J3 is grounded, and pin 3 of the paper tray upper limit sensor interface J3 is connected to +3.3V voltage. Pin 2 of the lower limit sensor interface J2 of the paper bin is connected to pin ADIN03 of the microprocessor U12, pin 1 of the upper limit sensor interface J3 of the paper bin is grounded through resistor R9, and pin 3 of the upper limit sensor interface J3 of the paper bin is connected to a +3.3V voltage. Pin 3 of the first paper path sensor interface J1 is connected to pin ADIN12 of the microprocessor U12, pin 1 of the paper tray upper limit sensor interface J3 is grounded through resistor R2, and pins 2 and 4 of the first paper path sensor interface J1 are connected to a +3.3V voltage. Pin 2 of the dual-sheet sensor interface J7 is connected to pin ADIN04 of the microprocessor U12, pin 1 of the dual-sheet sensor interface J7 is grounded through resistor R5, and pin 3 of the dual-sheet sensor interface J7 is connected to a +3.3V voltage. Pin 3 of the second paper path sensor interface J5 is connected to pin ADIN09 of microprocessor U12, pin 1 of the second paper path sensor interface J5 is grounded through resistor R3, and pins 2 and 4 of the second paper path sensor interface J5 are connected to +3.3V voltage. Pin 2 of the paper tray paper presence / absence sensor interface J12 is connected to pin ADIN06 of the microprocessor U12. Pin 1 of the paper tray paper presence / absence sensor interface J12 is grounded through resistor R14. Pin 3 of the paper tray paper presence / absence sensor interface J12 is connected to a +3.3V voltage.

[0065] In this embodiment, the upper limit sensor of the paper tray is a TP807, the lower limit sensor of the paper tray is a micro switch KW4-3Z-3 pulley, and the paper tray paper presence sensor, double sheet sensor, first paper path sensor, and second paper path sensor are all IR204-A and pt204-6B through-beam combination.

[0066] The paper tray upper limit sensor interface J3, paper tray lower limit sensor interface J2, first paper path sensor interface J1, double sheet sensor interface J7, second paper path sensor interface J5, and paper tray paper presence / absence sensor interface J12 are located on control board 2 and are used to connect to each sensor. The paper tray upper limit sensor interface J3 connects to the paper tray upper limit sensor and is used to monitor whether the answer sheets in the paper tray have reached the upper limit position. The paper tray lower limit sensor interface J2 connects to the paper tray lower limit sensor to monitor whether the answer sheets in the paper tray have reached the lower limit position. The first paper path sensor interface J1 is connected to the first paper path sensor and is used to monitor the running status of the answer sheet in the paper path. The dual-sheet sensor interface J7 connects to a dual-sheet sensor, which is used to detect whether multiple answer sheets enter the paper path at the same time, preventing double sheets or overlap. Double-sheet detection principle: Pin 2 of the dual-sheet sensor interface J7 is connected to pin ADIN04 of the microprocessor U12. The dual-sheet sensor 44 detects whether the sheets are overlapping. When a single sheet passes through normally, the dual-sheet sensor 44 will output a standard signal. If multiple sheets pass through at the same time, the occlusion intensity changes, and the dual-sheet sensor will output an abnormal signal. The microprocessor U12 will then pause counting and issue an alarm.

[0067] Furthermore, the paper is pushed into the paper path by the paper feed motor 52, and the damping motor 53 and the paper feed motor 54 work together to control the paper feed speed. The double-sheet sensor 44 is a through-beam photoelectric sensor composed of IR204-A and pt204-6B. When two sheets overlap, the increased thickness of the paper will cause abnormalities in the degree or time of infrared beam obstruction, thus generating a signal different from that of a single sheet.

[0068] The dual-sheet sensor 44 is connected to the control board 2 via the dual-sheet sensor interface J7. Specifically, pin 2 of the dual-sheet sensor interface J7 is connected to the ADIN04 pin of the microprocessor U12 (for analog signal input), pin 1 of the dual-sheet sensor interface J7 is grounded through resistor R5, and pin 3 of the dual-sheet sensor interface J7 is connected to a +3.3V voltage (to provide operating power).

[0069] When the double-sheet sensor 44 detects paper, the output signal is sent to the microprocessor U12 through the ADIN04 pin. The microprocessor U12 (TMS320LF2407A) monitors the voltage change of this pin in real time: when a single sheet passes normally, the signal is a specific pulse; when two sheets overlap, the signal amplitude is abnormal.

[0070] The microprocessor U12 digitizes the analog signal through its built-in ADC module and compares it with a preset threshold in the memory chip U13. If the signal exceeds the single-sheet range, the microprocessor U12 determines that two sheets are overlapping and immediately interrupts the drive of the paper feed motor 54, while simultaneously displaying an alarm message on the LCD screen 1.

[0071] After the user places the answer sheet into the paper feed compartment (6), they click the button module (3) to start counting. The paper feed motor (52) starts working, pushing the paper into the paper path one sheet at a time.

[0072] Workflow: After the paper enters the paper path, it is first detected by the double-sheet sensor 44. Under normal circumstances, a single sheet of answer sheet passes through, and the double-sheet sensor 44 outputs a standard signal; if the two sheets overlap, the paper thickness increases, and the occlusion strength changes, the double-sheet sensor will output an abnormal signal.

[0073] The signal from the dual-sheet sensor 44 is transmitted to the microprocessor U12 via the dual-sheet sensor interface J7. The microprocessor U12 analyzes the input to the ADIN04 pin in real time. Normal signal: The microprocessor controls the paper feed motor 54 to continue working and accumulate the count.

[0074] Abnormal signal (signal high level exceeds threshold): The microprocessor determines that the two sheets are overlapping and immediately stops the damping motor 53 and the paper feed motor 54 through the first motor driver U10 and the second motor driver U11. At the same time, the LCD screen 1 displays a "double sheet error" message.

[0075] The second paper path sensor interface J5 connects to the second paper path sensor, which is used to assist in monitoring the passage status of the answer sheets in the paper path. The paper tray paper presence sensor interface J12 connects to the paper tray paper presence sensor, which is used to detect whether there are answer sheets in the paper tray. Sensor module 4 is responsible for monitoring the equipment's operating status in real time and feeding the data back to control board 2 for processing. Sensor module 4 includes a paper tray upper limit sensor, a paper tray lower limit sensor, a paper tray paper presence / absence sensor, a double-sheet sensor, a first paper path sensor, and a second paper path sensor, which are connected to control board 2 through the aforementioned interfaces. Sensor module 4 plays a crucial role when the device is working: The paper tray sensor first checks whether the answer sheet is in place. The upper and lower limits of the paper tray are used to check whether the test paper is in the correct position within the paper tray. During paper feeding, dual-sheet sensors, the first paper path sensor, and the second paper path sensor monitor the status of the answer sheets to prevent errors. Control board 2 controls the motor module 5 based on sensor feedback to achieve automatic counting.

[0076] It should be noted that the button module 3 includes a first button 31 and a second button 32; both the first button 31 and the second button 32 are connected to the control board 2. Combination Figure 7 Pins 3 and 4 of the first button interface J8 are connected to pin ADIN07 of the microprocessor U12 and grounded through resistor R6. Pin 1 of the first button interface J8 is grounded and pin 2 of the first button interface J8 is connected to +3.3V voltage. Pins 3 and 4 of the second button interface J9 are connected to pin ADIN15 of the microprocessor U12 and grounded through resistor R7. Pin 1 of the second button interface J9 is grounded, and pin 2 of the first button interface J8 is connected to +3.3V.

[0077] It needs to be further explained that, in combination Figure 8 Pin 3 of the LCD screen interface J10 is connected to pin IOPF0 of the microprocessor U12 and is connected to +3.3V voltage through resistor R50. Pin IOPA3 of the microprocessor U12 is connected to pin 4 of the LCD screen interface J10 and is connected to +3.3V voltage through resistor R51. Pin 2 of the LCD screen interface J10 is grounded, and pin 1 of the LCD screen interface J10 is connected to +3.3V voltage.

[0078] In this embodiment, the LCD screen 1 is a 0.96-inch OLED display screen, which is connected to the control board 2 through the LCD screen interface J10.

[0079] Combination Figure 2 During operation, answer sheets are placed in batches in the paper feed compartment 6. A paper presence / absence sensor 43, installed above the paper feed compartment, detects whether the answer sheets are in place and provides feedback to the control board 2 via the paper presence / absence sensor interface J12. The control board 2 then starts the paper feed compartment motor 51. Upper limit sensors 41 and lower limit sensors 42 monitor the paper feed compartment status and provide feedback to the control board 2 via the upper limit sensor interface J3 and lower limit sensor interface J2, respectively. The control board 2 then controls the answer sheets to be in place, awaiting further operation. Clicking the first button 31 starts the paper feeding motor 52, damping motor 53, and paper feeding motor 54, initiating paper feeding. Along the paper path, there are intervals for double-sheet sensors 44, first paper path sensors 45, and second paper path sensors 46. These sensors monitor the running status of the answer sheets in the paper path and provide feedback to the control board 2. The control board 2 then starts counting and displays the results on the LCD screen 1. The end of the paper path is equipped with a paper receiving compartment 7, which is used to catch the counted test papers.

[0080] Paper movement recognition principle: If the paper actually moves forward, it will trigger the first paper path sensor 45 and the second paper path sensor 46 in sequence, generating a continuous signal sequence; if the paper stops, it may only trigger the first paper path sensor 45 and continue to block it, or the signal interval may be abnormal.

[0081] Specifically, combined Figure 6 Pin 3 of the first paper path sensor interface J1 is connected to pin ADIN12 of the microprocessor U12, and pin 3 of the second paper path sensor interface J5 is connected to pin ADIN09. The sensor signals are input to the microprocessor U12 after being divided by resistors for analog-to-digital conversion and analysis. When the paper moves, the first paper path sensor 45 is triggered first (generating an obstruction signal), followed by the second paper path sensor 46 being triggered within a predetermined time. The microprocessor U12 determines whether the paper is moving continuously by comparing the time difference and sequence of the two signals. If the signal interval is too long, it is judged as a standstill or an abnormality.

[0082] In one embodiment, combined Figure 3 The control board 2 also includes an emulator interface U14; pin 2 of the emulator interface U14 is connected to pin 1 of the microprocessor U12, pin 1 of the emulator interface U14 is connected to pin 144 of the microprocessor U12, pin 7 of the emulator interface U14 is connected to pin 142 of the microprocessor U12, pin 3 of the emulator interface U14 is connected to pin 139 of the microprocessor U12, pins 11 and 9 of the emulator interface U14 are both connected to pin 135 of the microprocessor U12, pin 14 of the emulator interface U14 is connected to pin 91 of the microprocessor U12, and pin 13 of the emulator interface U14 is connected to pin 90 of the microprocessor U12.

[0083] The present invention also provides an intelligent answer sheet counting method, the method comprising: The dual-sheet sensor 44 detects the signal when the paper passes through the paper path and outputs the dual-sheet detection signal to the microprocessor U12. The microprocessor U12 receives the double-sheet detection signal and compares it with a preset threshold in the storage chip U13 to determine whether the paper is a single sheet. If it is determined that the paper feed is not a single sheet, the microprocessor U12 will control the interruption of the paper feed and trigger an alarm; If it is determined that a single sheet has passed, the paper continues to move, triggering the first paper path sensor 45 and the second paper path sensor 46 in sequence. The microprocessor U12 monitors the trigger signal sequence of the first paper path sensor 45 and the second paper path sensor 46 in real time, including the trigger sequence and the trigger time difference; Based on the signal sequence, the microprocessor U12 determines whether the paper is moving normally; If the movement is determined to be normal, the microprocessor U12 performs a counting operation and updates the display; If an abnormal stoppage is detected, the microprocessor U12 will control the paper feed to pause and trigger an alarm.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0085] For those skilled in the art, designing different forms of control circuits according to the teachings of this invention does not require creative effort. Changes, modifications, substitutions, and variations made to the embodiments without departing from the principles and spirit of this invention still fall within the scope of protection of this invention.

Claims

1. An intelligent answer sheet counting device, characterized in that, The device includes an LCD screen (1), a control board (2), a button module (3), a sensor module (4), and a motor module (5); the LCD screen (1), the button module (3), the sensor module (4), and the motor module (5) are all connected to the control board (2); The LCD screen (1) is connected to the control board (2) and is used to display the number of papers; the button module (3) is connected to the control board (2) and is used to start counting; the motor module (5) is connected to the control board (2) and is used to feed paper; the sensor module (4) is connected to the control board (2) and is installed in the paper path to monitor the state of the paper in the paper path. The sensor module (4) includes a dual-sheet sensor (44), a first paper path sensor (45), and a second paper path sensor (46); the control board (2) includes a microprocessor U12 and a memory chip U13.

2. The intelligent answer sheet counting device as described in claim 1, characterized in that, The motor module (5) includes a paper tray motor (51), a paper feed motor (52), a damping motor (53), and a paper feed motor (54). The paper tray motor (51), paper feed motor (52), damping motor (53), and paper feed motor (54) are all connected to the control board (2).

3. The intelligent answer sheet counting device as described in claim 2, characterized in that, The control board (2) also includes a first PWM driver U6, a second PWM driver U7, a first motor driver U10, a second motor driver U11, a paper tray upper limit sensor interface J3, a paper tray lower limit sensor interface J2, a paper tray paper presence / absence sensor interface J12, a double sheet sensor interface J7, a first paper path sensor interface J1, a second paper path sensor interface J5, a first button interface J8, a second button interface J9, a paper tray motor interface J14, a paper feed motor interface J15, a damping motor interface J17, a paper feed motor interface J18, an LCD screen interface J10, and a power interface J13; Paper tray motor interface J14 is connected to the first PWM driver U6, and paper feed motor interface J15 is connected to the second PWM driver U7; the first PWM driver U6, the second PWM driver U7, the damping motor interface J17, the paper feed motor interface J18, the first motor driver U10, the second motor driver U11, the paper tray upper limit sensor interface J3, the paper tray lower limit sensor interface J2, the paper tray paper presence / absence sensor interface J12, the double sheet sensor interface J7, the first paper path sensor interface J1, the second paper path sensor interface J5, the first button interface J8, the second button interface J9, the LCD screen interface J10, the storage chip U13, and the power interface J13 are all connected to the microprocessor U12; Pin 1 of the power interface J13 is connected to +3.3V and connected to the VCC pin; pin 2 of the power interface J13 is connected to +5V; pin 3 of the power interface J13 is connected to +24V; and pin 4 of the power interface J13 is grounded.

4. The intelligent answer sheet counting device as described in claim 3, characterized in that, The sensor module (4) also includes a paper tray upper limit sensor (41), a paper tray lower limit sensor (42), and a paper tray paper presence / absence sensor (43). The paper tray upper limit sensor (41) is connected to the control board (2) through the paper tray upper limit sensor interface J3. The paper bin lower limit sensor (42) is connected to the control board (2) through the paper bin lower limit sensor interface J2; The paper tray paper presence sensor (43) is connected to the control board (2) via the paper tray paper presence sensor interface J12. The dual-sheet sensor (44) is connected to the control board (2) via the dual-sheet sensor interface J7. The first paper track sensor (45) is connected to the control board (2) through the first paper track sensor interface J1. The second paper path sensor (46) is connected to the control board (2) via the second paper path sensor interface J5.

5. The intelligent answer sheet counting device as described in claim 4, characterized in that, The D0 pin of memory chip U13 is connected to the D0 pin of microprocessor U12; the D1 pin of memory chip U13 is connected to the D1 pin of microprocessor U12; the D2 pin of memory chip U13 is connected to the D2 pin of microprocessor U12; the D3 pin of memory chip U13 is connected to the D3 pin of microprocessor U12; the D4 pin of memory chip U13 is connected to the D4 pin of microprocessor U12; the D5 pin of memory chip U13 is connected to the D5 pin of microprocessor U12; the D6 pin of memory chip U13 is connected to the D6 pin of microprocessor U12; the D7 pin of memory chip U13 is connected to the D7 pin of microprocessor U12; the memory chip U1... Pin D8 of memory chip U13 is connected to pin D8 of microprocessor U12; pin D9 of memory chip U13 is connected to pin D9 of microprocessor U12; pin D10 of memory chip U13 is connected to pin D10 of microprocessor U12; pin D11 of memory chip U13 is connected to pin D11 of microprocessor U12; pin D12 of memory chip U13 is connected to pin D12 of microprocessor U12; pin D13 of memory chip U13 is connected to pin D13 of microprocessor U12; pin D14 of memory chip U13 is connected to pin D14 of microprocessor U12; and pin D15 of memory chip U13 is connected to pin D15 of microprocessor U12. The A0 pin of memory chip U13 is connected to the A0 pin of microprocessor U12; the A1 pin of memory chip U13 is connected to the A1 pin of microprocessor U12; the A2 pin of memory chip U13 is connected to the A2 pin of microprocessor U12; the A3 pin of memory chip U13 is connected to the A3 pin of microprocessor U12; the A4 pin of memory chip U13 is connected to the A4 pin of microprocessor U12; the A5 pin of memory chip U13 is connected to the A5 pin of microprocessor U12; the A6 pin of memory chip U13 is connected to the A6 pin of microprocessor U12; the A7 pin of memory chip U13 is connected to the A7 pin of microprocessor U12; the memory chip U1... Pin A8 of memory chip U13 is connected to pin A8 of microprocessor U12; pin A9 of memory chip U13 is connected to pin A9 of microprocessor U12; pin A10 of memory chip U13 is connected to pin A10 of microprocessor U12; pin A11 of memory chip U13 is connected to pin A11 of microprocessor U12; pin A12 of memory chip U13 is connected to pin A12 of microprocessor U12; pin A13 of memory chip U13 is connected to pin A13 of microprocessor U12; pin A14 of memory chip U13 is connected to pin A14 of microprocessor U12; and pin A15 of memory chip U13 is connected to pin A15 of microprocessor U12. The / RD pin of the memory chip U13 is connected to the / RD pin of the microprocessor U12; the / WE pin of the memory chip U13 is connected to the / WE pin of the microprocessor U12; the / DS pin of the memory chip U13 is connected to the / DS pin of the microprocessor U12; pins 12, 34, 39 and 40 of the memory chip U13 are all grounded, and pins 11 and 33 of the memory chip U13 are connected to VCC.

6. The intelligent answer sheet counting device as described in claim 5, characterized in that, The IOPB0 pin of the first PWM driver U6 is connected to the IOPB0 pin of the microprocessor U12; the IOPA7 pin of the first PWM driver U6 is connected to the IOPA7 pin of the microprocessor U12; the IOPE1 pin of the first PWM driver U6 is connected to the IOPE1 pin of the microprocessor U12; the IOPB0 pin of the first PWM driver U6 is grounded through resistor R27; the IOPA7 pin of the first PWM driver U6 is grounded through resistor R23; the IOPE1 pin of the first PWM driver U6 is connected to a 5V voltage through resistor R25; the first PWM driver... The GND pin of the first PWM driver U6 is grounded; the VS pin of the first PWM driver U6 is connected to +M24V voltage; the VSS pin of the first PWM driver U6 is connected to 5V voltage and then grounded through capacitor C9; the OUT1 and OUT4 pins of the first PWM driver U6 are connected to pin 2 of the paper tray motor interface J14 and grounded in reverse through diode D6, and connected to +M24V voltage in forward through diode D1; the OUT2 and OUT3 pins of the first PWM driver U6 are connected to pin 1 of the paper tray motor interface J14 and grounded in reverse through diode D5, and connected to +M24V voltage in forward through diode D2. The IOPB1 pin of the second PWM driver U7 is connected to the IOPB1 pin of the microprocessor U12; the IOPA6 pin of the second PWM driver U7 is connected to the IOPA6 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is connected to the IOPE5 pin of the microprocessor U12; the IOPE5 pin of the second PWM driver U7 is grounded through resistor R32; the IOPA6 pin of the second PWM driver U7 is grounded through resistor R30; the IOPB1 pin of the second PWM driver U7 is connected to a 5V voltage through resistor R31. The GND pin of the second PWM driver U7 is grounded; the VS pin of the second PWM driver U7 is connected to +M24V voltage; the VSS pin of the second PWM driver U7 is connected to 5V voltage and then grounded through C11; the OUT1 and OUT4 pins of the second PWM driver U7 are connected to pin 2 of the paper feed motor interface J15 and then grounded in reverse through diode D8, and connected to +M24V voltage in forward through diode D3; the OUT2 and OUT3 pins of the second PWM driver U7 are connected to pin 1 of the paper feed motor interface J15 and then grounded in reverse through diode D7, and connected to +M24V voltage in forward through diode D4. The G pin of the first motor driver U10 is connected to the IOPB2 pin of the microprocessor U12 and grounded through resistor R33; the S pin of the first motor driver U10 is grounded; the D pin of the first motor driver U10 is connected to the 2 pin of the damping motor interface J17, and the 1 pin of the damping motor interface J17 is connected to the +M24V voltage. The G pin of the second motor driver U11 is connected to the IOPB3 pin of the microprocessor U12 and grounded through resistor R34; the S pin of the second motor driver U11 is grounded; the D pin of the second motor driver U11 is connected to pin 2 of the paper feed motor interface J18, and pin 1 of the paper feed motor interface J18 is connected to +M24V voltage.

7. The intelligent answer sheet counting device as described in claim 6, characterized in that, Pin 2 of the paper tray upper limit sensor interface J3 is connected to pin ADIN11 of the microprocessor U12 and is connected to +3.3V voltage through resistor R1. Pin 1 of the paper tray upper limit sensor interface J3 is grounded, and pin 3 of the paper tray upper limit sensor interface J3 is connected to +3.3V voltage. Pin 2 of the lower limit sensor interface J2 of the paper bin is connected to pin ADIN03 of the microprocessor U12, pin 1 of the upper limit sensor interface J3 of the paper bin is grounded through resistor R9, and pin 3 of the upper limit sensor interface J3 of the paper bin is connected to a +3.3V voltage. Pin 3 of the first paper path sensor interface J1 is connected to pin ADIN12 of the microprocessor U12, pin 1 of the paper tray upper limit sensor interface J3 is grounded through resistor R2, and pins 2 and 4 of the first paper path sensor interface J1 are connected to a +3.3V voltage. Pin 2 of the dual-sheet sensor interface J7 is connected to pin ADIN04 of the microprocessor U12, pin 1 of the dual-sheet sensor interface J7 is grounded through resistor R5, and pin 3 of the dual-sheet sensor interface J7 is connected to a +3.3V voltage. Pin 3 of the second paper path sensor interface J5 is connected to pin ADIN09 of microprocessor U12, pin 1 of the second paper path sensor interface J5 is grounded through resistor R3, and pins 2 and 4 of the second paper path sensor interface J5 are connected to +3.3V voltage. Pin 2 of the paper tray paper presence / absence sensor interface J12 is connected to pin ADIN06 of the microprocessor U12. Pin 1 of the paper tray paper presence / absence sensor interface J12 is grounded through resistor R14. Pin 3 of the paper tray paper presence / absence sensor interface J12 is connected to a +3.3V voltage.

8. The intelligent answer sheet counting device as described in claim 7, characterized in that, The button module (3) includes a first button (31) and a second button (32); both the first button (31) and the second button (32) are connected to the control board (2); Among them, pins 3 and 4 of the first button interface J8 are connected to pin ADIN07 of microprocessor U12 and grounded through resistor R6. Pin 1 of the first button interface J8 is grounded and pin 2 of the first button interface J8 is connected to +3.3V voltage. Pins 3 and 4 of the second button interface J9 are connected to pin ADIN15 of the microprocessor U12 and grounded through resistor R7. Pin 1 of the second button interface J9 is grounded, and pin 2 of the first button interface J8 is connected to +3.3V.

9. The intelligent answer sheet counting device as described in claim 8, characterized in that, Pin 3 of the LCD screen interface J10 is connected to pin IOPF0 of the microprocessor U12 and is connected to +3.3V through resistor R50. Pin IOPA3 of the microprocessor U12 is connected to pin 4 of the LCD screen interface J10 and is connected to +3.3V through resistor R51. Pin 2 of the LCD screen interface J10 is grounded, and pin 1 of the LCD screen interface J10 is connected to +3.3V. The control board (2) also includes an emulator interface U14; Pin 2 of the emulator interface U14 is connected to pin 1 of the microprocessor U12. Pin 1 of the emulator interface U14 is connected to pin 144 of the microprocessor U12. Pin 7 of the emulator interface U14 is connected to pin 142 of the microprocessor U12. Pin 3 of the emulator interface U14 is connected to pin 139 of the microprocessor U12. Pins 11 and 9 of the emulator interface U14 are both connected to pin 135 of the microprocessor U12. Pin 14 of the emulator interface U14 is connected to pin 91 of the microprocessor U12. Pin 13 of the emulator interface U14 is connected to pin 90 of the microprocessor U12.

10. The intelligent answer sheet counting device as described in claim 9, characterized in that, The dual-sheet sensor (44) detects the signal when the paper passes through the paper path and outputs the dual-sheet detection signal to the microprocessor U12; The microprocessor U12 receives the double-sheet detection signal and compares it with a preset threshold in the storage chip U13 to determine whether the paper is a single sheet. If it is determined that the paper feed is not a single sheet, the microprocessor U12 will control the interruption of the paper feed and trigger an alarm; If it is determined that a single sheet passes through, the paper continues to move, triggering the first paper path sensor (45) and the second paper path sensor (46) in sequence. The microprocessor U12 monitors the trigger signal sequence of the first paper path sensor (45) and the second paper path sensor (46) in real time, including the trigger sequence and the trigger time difference; Based on the signal sequence, the microprocessor U12 determines whether the paper is moving normally; If the movement is determined to be normal, the microprocessor U12 performs a counting operation and updates the display; If an abnormal stoppage is detected, the microprocessor U12 will control the paper feed to pause and trigger an alarm.

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