A paper feeding device and method for a radioactive aerosol activity monitor

Abstract

The present invention discloses a paper feeding device and method for a radioactive aerosol activity monitor, belonging to the technical field of nuclear radiation measuring instruments. The device includes a paper feeding chassis and perforated filter paper; a paper feeding power assembly and a filter paper support assembly are provided in the paper feeding chassis, the paper feeding power assembly including a main motor and a secondary motor; the filter paper support assembly including a first filter paper shaft and a second filter paper shaft; a photoelectric switch is provided on the second filter paper shaft; the method includes: 1. filter paper installation; 2. filter paper feeding; and 3. paper feeding detection. The present invention uses a dual-motor mode to synchronously control the movement of the perforated filter paper, thereby resolving the problems of slipping or stacking of the filter paper when the driven shaft is loose under a single motor, or breaking of the filter paper when the motor pulls the filter paper when it is tight; the invention can directly eliminate the unstable factors of the traditional single-motor driven shaft tension, which cannot ensure the standardization of each adjustment due to manual non-standard adjustment, and the driven shaft gradually loosening and requiring readjustment, thereby ensuring the stability of the overall operation of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation measuring instruments, and in particular relates to a paper feeding device and method of a radioactive aerosol activity monitor. Background Art

[0002] Currently, most radioactive aerosol activity monitors on the market use a single paper feed motor to control the movement of the filter paper. The device primarily consists of the paper feed motor, photoelectric switch, active shaft, passive shaft, filter paper shaft, grating, filter paper, and other components. The paper feed motor is a standard reduction motor that runs when powered on and stops when powered off. The paper feed motor is typically mounted on the active shaft, while the filter paper is typically mounted on the passive shaft. New filter paper is placed flat on the filter paper shaft, starting at the passive shaft, and finally wound around the active shaft.

[0003] In this way, when the motor on the active shaft is powered on, it will drive the new filter paper on the driven shaft to move, thereby completing the movement and replacement of the used filter paper. In addition, to determine whether the filter paper has moved, a photoelectric switch and a grid are generally installed on the filter paper shaft. This hollow grid is engraved on a metal disc. When the motor is started, the friction of the filter paper during movement will drive the filter paper shaft to rotate, and the grid will also rotate clockwise / counterclockwise. The photoelectric switch will emit infrared light to the opposite receiving end. The hollow grid will periodically allow the infrared light emitted by the photoelectric switch to pass through. By counting the number of infrared lights passing through the grid, the distance the filter paper has advanced can be calculated, thereby achieving automatic paper feeding of the filter paper and calculating the remaining filter paper. In addition, the current state of the filter paper can be determined by judging whether the photoelectric switch is operating normally. If the photoelectric switch does not operate as required, the filter paper may be slipping or broken.

[0004] The above is the basic operating logic of a common paper feeding device. This common device has some inevitable technical problems, which makes it easy to induce various faults during actual use.

[0005] 1. The paper feed motor has no operational feedback. If the motor is faulty, there is no efficient way to determine if the motor is damaged. The only option is to remove the device and power it on separately to observe if the motor is rotating. The motor is quiet when it is running. The noise is blocked by the device and the noise from the surrounding environment and the device itself during operation, so the sound of the motor rotating cannot be heard. Therefore, it is necessary to determine if the motor is faulty.

[0006] 2. The driven shaft requires manual adjustment. If the shaft is too tight, the filter paper may be torn; if it is too loose, the filter paper may be piled up in the air chamber, resulting in waste. For mass-produced equipment, the use of different staff and non-standard manual adjustments will bring instability to the operation of the device, which is prone to frequent failures. In addition, as the damping of the driven shaft gradually decreases during rotation, the device needs regular maintenance, which consumes manpower costs and has unsatisfactory operation and maintenance results.

[0007] 3. Friction needs to be increased between the filter paper shaft and the filter paper so that the filter paper shaft can drive the grating to rotate when the filter paper moves. If the filter paper is not sufficiently frictional, causing the grating to be unable to rotate, an error will be reported externally, and unused filter paper will be wasted, increasing operation and maintenance costs. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to address the deficiencies in the above-mentioned prior art and provide a paper feeding device for a radioactive aerosol activity monitor. Through the dual-motor mode of the main motor and the auxiliary motor, the movement of the porous filter paper is synchronously controlled to solve the problems of slipping or stacking of the filter paper when the driven shaft is loose in the case of a single motor, or breaking of the filter paper caused by the motor pulling the filter paper when it is tight. The use of dual motors to control the movement of the porous filter paper can directly eliminate the problems of the traditional single-motor case in which the tightness of the driven shaft cannot be ensured by manual non-standard adjustment each time, and the unstable factor that the driven shaft will gradually loosen and need to be readjusted during use, thereby ensuring the stability of the operation of the entire device.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: a paper feed device of a radioactive aerosol activity monitor: comprising a paper feed box and a perforated filter paper installed in the paper feed box;

[0010] A paper feed power assembly and a filter paper support assembly coordinated with the paper feed power assembly are provided in the paper feed chassis. The paper feed power assembly includes a main motor and an auxiliary motor both provided below the paper feed chassis. The main motor and the auxiliary motor are respectively arranged on both sides of the paper feed chassis. The main shaft of the main motor passes through the paper feed chassis and extends to the other side of the paper feed chassis. The auxiliary shaft of the auxiliary motor passes through the paper feed chassis and extends to the other side of the paper feed chassis. The main shaft and the auxiliary shaft are arranged in parallel, and the radius of the main shaft and the auxiliary shaft are equal.

[0011] The filter paper support assembly includes a first filter paper shaft and a second filter paper shaft, both of which are arranged above the paper feeder box. The first filter paper shaft and the main motor are arranged on the same side, and the second filter paper shaft and the auxiliary motor are arranged on the same side. A first support frame is provided on the first filter paper shaft, and a second support frame is provided on the second filter paper shaft.

[0012] A photoelectric switch is provided on the second filter paper shaft;

[0013] A communication interface is provided at the bottom of the paper feeder chassis, and the communication interface is connected to an external control box. A circuit board is provided in the control box, and a controller and a memory connected to the controller are integrated on the circuit board. The signal output end of the photoelectric switch is connected to the signal input end of the controller;

[0014] The perforated filter paper is an opaque filter paper. A plurality of detection segments are provided on the perforated filter paper. The plurality of detection segments are evenly arranged in sequence along the length direction of the perforated filter paper, and the detection segments are arranged at the edge of the perforated filter paper.

[0015] Furthermore, the paper feeder chassis includes a chassis frame and a chassis body arranged in the middle of the chassis frame, the chassis frame and the chassis body are integrally formed, the chassis body is a box structure with a side opening, the open side of the chassis body is connected to the chassis frame, the main motor and the auxiliary motor are both arranged on the inner side of the chassis body, the first filter paper shaft and the second filter paper shaft, and the first support frame and the second support frame are all arranged on the outside of the chassis body.

[0016] Furthermore, the first support frame and the second support frame are both L-shaped structures, the horizontal sections of the first support frame and the second support frame are both connected to the chassis body, the first filter paper shaft is passed through the vertical section of the first support frame, and the second filter paper shaft is passed through the vertical section of the second support frame.

[0017] Furthermore, a motor speed regulator is provided in the chassis body and cooperates with the main motor and the auxiliary motor respectively. The motor speed regulator is connected to the main motor and the auxiliary motor respectively through wires.

[0018] Furthermore, the detection section includes two marking holes and a verification hole arranged on the porous filter paper, the verification hole is arranged between the two marking holes, the spacing between the verification hole and the two marking holes is equal, and the two marking holes and the verification hole are both opened on the same side of the porous filter paper; the spacing between two adjacent detection sections is equal to the spacing between the verification hole and the marking hole.

[0019] The present invention also provides a method for feeding paper in a paper feeding device of a radioactive aerosol activity monitor, the method comprising the following steps:

[0020] Step 1: Install filter paper: Place a new roll of filter paper with open pores on the secondary shaft, pull out the starting section of the new filter paper with open pores, and overlap it on the second filter paper shaft and the first filter paper shaft in sequence, so that the starting section of the new filter paper with open pores passes through the gap between the first filter paper shaft and the first support frame and adheres to the main shaft;

[0021] Step 2: Filter paper feeding, the process is as follows:

[0022] Step 201: Set the rotation speed of the main motor and rotation angle , and the rotation speed of the auxiliary motor and rotation angle And save it to the storage synchronously;

[0023] Step 202: The controller controls the auxiliary motor to rotate clockwise, and the auxiliary shaft rotates clockwise under the drive of the auxiliary motor. Simultaneously, the controller controls the main motor to rotate clockwise, and the main shaft rotates clockwise under the drive of the main motor. The perforated filter paper wound on the auxiliary shaft is peeled off layer by layer under the drive of the auxiliary motor, and the perforated filter paper on the main shaft is wound layer by layer under the drive of the main motor.

[0024] Step 3: Paper feeding detection: When the main motor and the auxiliary motor start to rotate synchronously, the controller controls the photoelectric switch to work, and the photoelectric switch detects the paper feeding of the porous filter paper. When the photoelectric switch detects a complete set of detection segments, the porous filter paper feeds normally; otherwise, the porous filter paper feeds abnormally, the buzzer on the motor speed regulator alarms, the main motor and the auxiliary motor are turned off, and the paper feeding stops.

[0025] Furthermore, in step 201, according to the rotation angle of the main shaft in the main motor and the rotation angle of the secondary shaft in the secondary motor , and the time for the main motor and auxiliary motor to rotate synchronously , the rotation speed of the main shaft in the main motor can be obtained and the rotation speed of the secondary shaft in the secondary motor , the process is as follows:

[0026] Step 2011: The main shaft and the secondary shaft need to keep rotating synchronously, that is, the linear speed of the main shaft and the secondary shaft is equal. ; In addition, the linear speed of the main shaft and the secondary shaft can be expressed by the rotational speed, that is, ;in The rotation speed of the main shaft; is the equivalent radius of the principal axis; is the rotation speed of the secondary shaft; is the equivalent radius of the secondary axis;

[0027] Step 2012: The radii of the main axis and the secondary axis are equal and both However, due to the different thickness of the filter paper wrapped around the main axis and the secondary axis, the equivalent radius of the main axis is and the equivalent radius of the secondary axis Not equal; equivalent radius of the principal axis , the equivalent radius of the secondary axis ;in, is the thickness of a single layer of filter paper, The number of layers wound on the main shaft, is the number of filter paper layers remaining on the secondary shaft;

[0028] The remaining number of layers on the secondary axis Substituting the relationship into the equivalent radius relationship of the secondary axis, we can get ; The number of filter paper layers wound on the main shaft Substituting the relationship into the equivalent radius relationship of the main axis, we can get ;

[0029] Step 2013: The rotation speed of the main shaft and the rotation angle of the spindle The relationship between ; The rotation speed of the secondary shaft and the rotation angle of the countershaft The relationship between ;

[0030] According to the relationship between the rotation speed and the rotation angle, and the relationship between the equivalent radius and the thickness of the filter paper wrapped around the axis in step 2012, the linear speed formula of the main shaft and the secondary shaft in step 2011 can be converted into ;in, is the time for the main shaft and the secondary shaft to rotate synchronously, and the total thickness of the multiple layers of filter paper wound on the secondary shaft is ;

[0031] Step 2014: When the main shaft rotates 2π radians, that is, when a circle of filter paper is wrapped around the main shaft, the circumference of the filter paper is ; When the main shaft rotates another 2π radians, the circumference of the second layer of filter paper is ; Similarly, when entangled Layer, the The perimeter of the layer is ; Sum the formula for the circumference of the filter paper wrapped around the main shaft, and Substitute into the summation formula to get the moving distance Rotation angle with the main axis The functional relationship between ,but

[0032] ;

[0033] When the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft, and the circumference of the filter paper reduced by the secondary shaft is When the secondary shaft rotates another 2π radians, the circumference of the second layer of filter paper peeled off is ; Similarly, when the secondary shaft When the first layer of filter paper is peeled off, The circumference of the peeled filter paper layer is ; Sum the formula of the perimeter of the filter paper peeled off on the secondary axis, and Substitute into the summation formula to get the moving distance and rotation angle The functional relationship between ,but

[0034] ;

[0035] Therefore, when the filter paper circumference is given When the rotation angle of the main motor is Rotation angle of auxiliary motor ; Then, according to the formula in step 2013, the time for the main shaft and the secondary shaft to rotate synchronously is obtained , and finally the rotation speed of the spindle can be obtained and the secondary shaft rotation speed .

[0036] Furthermore, in step 2012, the thickness of the single layer of filter paper is , then the number of filter paper layers wound on the secondary shaft is , when the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft; when the secondary shaft rotates another 2π radians, the second layer is peeled off; and so on, when the secondary shaft rotates an angle of When the number of filter paper layers remaining on the secondary shaft is The relationship is ;

[0037] When the main shaft rotates 2π radians, a circle of filter paper is wrapped around the main shaft; when the main shaft rotates another 2π radians, the second layer of filter paper is wrapped around the main shaft; and so on. When the number of filter paper layers wound on the main shaft is The relationship is .

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. The present invention uses a dual-motor mode of a main motor and an auxiliary motor to synchronously control the movement of the porous filter paper, thereby solving the problem of slipping or stacking of the filter paper when the driven shaft is loose in the case of a single motor, or the failure of the filter paper being pulled by the motor and causing breakage when the driven shaft is tight; and the use of dual motors to control the movement of the porous filter paper can directly eliminate the unstable factors of the traditional single-motor case in which the tightness of the driven shaft cannot be guaranteed by manual non-standard adjustment each time, and the driven shaft will gradually loosen and need to be readjusted during use, thereby ensuring the stability of the operation of the entire device.

[0040] 2. The present invention utilizes a combination of a photoelectric switch and opaque perforated filter paper to solve the problem that the filter paper cannot drive the grid on the filter paper shaft when it is smooth, resulting in abnormal paper feeding.

[0041] 3. In order to achieve synchronous rotation of the main motor and the auxiliary motor, the present invention adds a filter paper movement algorithm to calculate the rotation speed and rotation angle of the main motor and the auxiliary motor, making the filter paper movement more accurate, thereby extending the measurement time and reducing operating costs.

[0042] In summary, the present invention synchronously controls the movement of the porous filter paper through the dual-motor mode of the main motor and the auxiliary motor, thereby solving the problem of the filter paper slipping or stacking when the driven shaft is loose under the single motor condition, or the filter paper breaking caused by the motor pulling when it is tight; and the use of dual motors to control the movement of the porous filter paper can directly eliminate the problem of the tightness of the driven shaft in the traditional single-motor condition being unable to ensure the standardization of each adjustment due to manual non-standard adjustment, and the unstable factor that the driven shaft will gradually loosen and need to be readjusted during use, thereby ensuring the stability of the operation of the entire device.

[0043] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is the front view of the present invention.

[0045] Figure 2 It is a left view of the present invention.

[0046] Figure 3 Schematic diagram of the structure of the perforated filter paper of the present invention.

[0047] Figure 4 This is a circuit principle block diagram of the present invention.

[0048] Figure 5 It is a flowchart of the method of the present invention.

[0049] Description of the accompanying drawings:

[0050] 1—Paper feeder chassis; 2—Perforated filter paper; 3—Main motor;

[0051] 4—auxiliary motor; 5—main shaft; 7—first filter paper shaft;

[0052] 8—second filter paper shaft; 9—first support frame; 11—chassis frame;

[0053] 12—chassis body; 13—communication interface; 14—controller;

[0054] 15—memory; 16—photoelectric switch; 17—motor speed regulator;

[0055] 18—Electric wire; 19—Marking hole; 20—Verification hole. DETAILED DESCRIPTION

[0056] like Figures 1 to 4 The paper feed device of the radioactive aerosol activity monitor shown in the figure comprises a paper feed box 1 and a porous filter paper 2 installed in the paper feed box 1;

[0057] A paper feed power assembly and a filter paper support assembly coordinated with the paper feed power assembly are provided in the paper feed chassis 1. The paper feed power assembly includes a main motor 3 and an auxiliary motor 4, both of which are provided below the paper feed chassis 1. The main motor 3 and the auxiliary motor 4 are respectively arranged on both sides of the paper feed chassis 1. The main shaft 5 of the main motor 3 passes through the paper feed chassis 1 and extends to the other side of the paper feed chassis 1. The auxiliary shaft of the auxiliary motor 4 passes through the paper feed chassis 1 and extends to the other side of the paper feed chassis 1. The main shaft 5 and the auxiliary shaft are arranged in parallel, and the radius of the main shaft 5 and the auxiliary shaft are equal.

[0058] The filter paper support assembly includes a first filter paper shaft 7 and a second filter paper shaft 8, both of which are arranged above the paper feeder box 1. The first filter paper shaft 7 and the main motor 3 are arranged on the same side, and the second filter paper shaft 8 and the auxiliary motor 4 are arranged on the same side; a first support frame 9 is provided on the first filter paper shaft 7, and a second support frame is provided on the second filter paper shaft 8;

[0059] The second filter paper shaft 8 is provided with a photoelectric switch 16;

[0060] A communication interface 13 is provided at the bottom of the paper feeder chassis 1, and the communication interface 13 is connected to an external control box. A circuit board is provided in the control box, and a controller 14 and a memory 15 connected to the controller 14 are integrated on the circuit board. The signal output end of the photoelectric switch 16 is connected to the signal input end of the controller 14;

[0061] The porous filter paper 2 is an opaque filter paper. A plurality of detection segments are provided on the porous filter paper 2 . The plurality of detection segments are evenly arranged in sequence along the length direction of the porous filter paper 2 , and the detection segments are arranged at the edge of the porous filter paper 2 .

[0062] The present invention uses a dual-motor mode of a main motor 3 and an auxiliary motor 4 to synchronously control the movement of the porous filter paper 2, thereby solving the problem that in the case of a single motor, the filter paper slips or stacks when the driven shaft is loose, or the motor pulls the filter paper and causes it to break when it is tight; and the use of dual motors to control the movement of the porous filter paper 2 can directly eliminate the problem that the tightness of the driven shaft in the traditional single-motor case cannot be guaranteed to be standard each time due to manual non-standard adjustment, and the driven shaft will gradually loosen during use, which is an unstable factor that needs to be readjusted, thereby ensuring the stability of the operation of the entire device.

[0063] The present invention utilizes a combination of a photoelectric switch 16 and an opaque filter paper with holes 2 to solve the problem that the filter paper cannot drive the grid on the filter paper shaft when it is smooth, thus causing abnormal paper feeding.

[0064] In order to achieve synchronous rotation of the main motor 3 and the auxiliary motor 4, the present invention adds a filter paper movement algorithm to calculate the rotation speed and rotation angle of the main motor 3 and the auxiliary motor 4, so that the filter paper movement is more accurate, thereby extending the measurement time and reducing the operating cost.

[0065] It should be noted that for the paper feeding device, the movement of the filter paper is mainly fed back to the outside by a photoelectric switch, which is equipped with a hollow grating and installed on the filter paper shaft. When the filter paper is pulled and moved by the motor, the grating on the filter paper shaft will rotate synchronously due to the effect of friction. The infrared light of the photoelectric switch will feedback the bright-dark-bright information to the CPU. After receiving the correct feedback information, the CPU can determine that the filter paper is moving normally. The communication interface 13 is connected to the external control box using the CAN protocol; when the controller 14 issues a paper feeding command through the CAN protocol, assuming that the perforated filter paper 2 needs to move Lmm, the auxiliary motor 4 rotates a very small distance first. Since the main motor 3 is pulling the perforated filter paper 2 at this time, the perforated filter paper 2 can be unloaded in this way. The main motor 3 then starts to rotate again, which can ensure that the perforated filter paper 2 is not subjected to a large pulling force and thus breaks during the movement.

[0066] In particular, for the filter paper, without changing the material, it can be changed in color and slightly thickened to ensure that the infrared light emitted by the photoelectric switch 16 is not transparent to the filter paper. Then, holes are made on the surface of the filter paper at the required distance, as long as the photoelectric switch 16 can pass through the holes.

[0067] like Figure 1 As shown, in this embodiment, the paper feeding chassis 1 includes a chassis frame 11 and a chassis body 12 arranged in the middle of the chassis frame 11, the chassis frame 11 and the chassis body 12 are integrally formed, the chassis body 12 is a box structure with a side opening, the open side of the chassis body 12 is connected to the chassis frame 11, the main motor 3 and the auxiliary motor 4 are both arranged on the inner side of the chassis body 12, the first filter paper shaft 7 and the second filter paper shaft 8, and the first support frame 9 and the second support frame are all arranged on the outside of the chassis body 12.

[0068] In this embodiment, the first support frame 9 and the second support frame are both L-shaped structures, the horizontal sections of the first support frame 9 and the second support frame are connected to the chassis body 12, the first filter paper shaft 7 is passed through the vertical section of the first support frame 9, and the second filter paper shaft 8 is passed through the vertical section of the second support frame.

[0069] In this embodiment, a motor speed regulator 17 is further provided in the chassis body 12 and cooperates with the main motor 3 and the auxiliary motor 4 respectively. The motor speed regulator 17 is connected to the main motor 3 and the auxiliary motor 4 respectively through wires 18.

[0070] In this embodiment, the detection section includes two marking holes 19 and a verification hole 20 provided on the porous filter paper 2. The verification hole 20 is arranged between the two marking holes 19. The spacing between the verification hole 20 and the two marking holes 19 is equal. The two marking holes 19 and the verification hole 20 are both opened on the same side of the porous filter paper 2; the spacing between two adjacent detection sections is equal to the spacing between the verification hole 20 and the marking hole 19.

[0071] In actual use, filter paper is grouped into three holes, each designated as a test segment. The holes on either side are designated as marking holes 19, and the center hole is designated as verification hole 20. As the filter paper 2 moves, it begins at marking hole 19, passes through verification hole 20, and then ends at marking hole 19. Therefore, photoelectric switch 16 provides three feedback loops to controller 14. If the controller receives three complete feedback loops, it confirms normal paper feeding. However, if a paper feeding malfunction occurs, such as a break, the most common malfunction, the photoelectric switch 16 will provide fewer than three feedback loops to the controller, indicating a filter paper fault.

[0072] Since the openings are uniform, the actual distance the filter paper moves can be calculated using the feedback from the photoelectric switch 16. By matching the distance the motor rotates, both parties can verify each other. If the distance the motor drives the filter paper to move is greater than the calculated distance based on the photoelectric switch feedback, this can help determine if the filter paper is broken or piled up. If the distance the photoelectric switch feedback is greater than the distance the motor drives the filter paper to move, this can help determine if the motor is faulty.

[0073] like Figures 1 to 5 A method for feeding paper in a paper feeding device of a radioactive aerosol activity monitor is shown, the method comprising the following steps:

[0074] Step 1: Install filter paper: Place a new roll of perforated filter paper 2 on the secondary shaft, pull out the starting section of the new perforated filter paper 2, and overlap it on the second filter paper shaft 8 and the first filter paper shaft 7 in sequence, so that the starting section of the new perforated filter paper 2 passes through the gap between the first filter paper shaft 7 and the first support frame 9 and adheres to the main shaft 5;

[0075] Step 2: Filter paper feeding, the process is as follows:

[0076] Step 201: Set the rotation speed of the main motor 3 and rotation angle , and the rotation speed of the auxiliary motor 4 and rotation angle And synchronously save it to the memory 15;

[0077] Step 202: The controller 14 controls the auxiliary motor 4 to rotate clockwise, and the auxiliary shaft rotates clockwise under the drive of the auxiliary motor 4. At the same time, the controller 14 controls the main motor 3 to rotate clockwise, and the main shaft 5 rotates clockwise under the drive of the main motor 3. The porous filter paper 2 wound on the auxiliary shaft is peeled off layer by layer under the drive of the auxiliary motor 4, and the porous filter paper 2 on the main shaft 5 is wound layer by layer under the drive of the main motor 3.

[0078] Step 3: Paper feeding detection: When the main motor 3 and the auxiliary motor 4 start to rotate synchronously, the controller 14 controls the photoelectric switch 16 to work, and the photoelectric switch 16 detects the feeding status of the porous filter paper 2. When the photoelectric switch 16 detects a complete set of detection segments, the porous filter paper 2 feeds normally; otherwise, the porous filter paper 2 feeds abnormally, the buzzer on the motor speed regulator 17 sounds an alarm, and the main motor 3 and the auxiliary motor 4 are turned off, and the paper feeding stops.

[0079] In this embodiment, in step 201, according to the rotation angle of the main shaft 5 in the main motor 3, and the rotation angle of the secondary shaft in the auxiliary motor 4 , and the time for the main motor 3 and the auxiliary motor 4 to rotate synchronously , the rotation speed of the main shaft 5 in the main motor 3 can be obtained and the rotation speed of the secondary shaft in the auxiliary motor 4 , the process is as follows:

[0080] Step 2011: The main shaft 5 and the secondary shaft need to keep rotating synchronously, that is, the linear speeds of the main shaft 5 and the secondary shaft are equal. In addition, the linear speed of the main shaft 5 and the secondary shaft can be expressed by the rotational speed. ;in is the rotation speed of the main shaft 5; is the equivalent radius of the main axis 5; is the rotation speed of the secondary shaft; is the equivalent radius of the secondary axis;

[0081] Step 2012: The radii of the main axis 5 and the secondary axis are equal and both However, due to the different thickness of the filter paper wrapped around the main axis 5 and the secondary axis, the equivalent radius of the main axis 5 is and the equivalent radius of the secondary axis Not equal; equivalent radius of main axis 5 , the equivalent radius of the secondary axis ;in, is the thickness of a single layer of filter paper, The number of layers wound on the main shaft 5, is the number of filter paper layers remaining on the secondary shaft;

[0082] The remaining number of layers on the secondary axis Substituting the relationship into the equivalent radius relationship of the secondary axis, we can get ; The number of filter paper layers wound on the main shaft 5 Substituting the relationship into the equivalent radius relationship of the main axis 5, we can get ;

[0083] Step 2013: The rotation speed of the main shaft 5 and the rotation angle of spindle 5 The relationship between ; The rotation speed of the secondary shaft and the rotation angle of the countershaft The relationship between ;

[0084] According to the relationship between the rotation speed and the rotation angle, and the relationship between the equivalent radius and the thickness of the filter paper wound on the axis in step 2012, the linear speed formula of the main shaft 5 and the secondary shaft in step 2011 can be converted into ;in, is the time for the main shaft 5 and the secondary shaft to rotate synchronously, and the total thickness of the multiple layers of filter paper wound on the secondary shaft is ;

[0085] Step 2014: When the main shaft 5 rotates 2π radians, that is, when a circle of filter paper is wrapped around the main shaft 5, the circumference of the filter paper is When the main shaft 5 rotates another 2π radians, the circumference of the second layer of filter paper is ; Similarly, when entangled Layer, the The perimeter of the layer is ; Sum the formula of the circumference of the filter paper wound on the main shaft 5, and Substitute into the summation formula to get the moving distance Rotation angle with spindle 5 The functional relationship between ,but

[0086] ;

[0087] When the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft, and the circumference of the filter paper reduced by the secondary shaft is When the secondary shaft rotates another 2π radians, the circumference of the second layer of filter paper peeled off is ; Similarly, when the secondary shaft When the first layer of filter paper is peeled off, The circumference of the peeled filter paper layer is ; Sum the formula of the perimeter of the filter paper peeled off on the secondary axis, and Substitute into the summation formula to get the moving distance and rotation angle The functional relationship between ,but

[0088] ;

[0089] Therefore, when the filter paper circumference is given When the rotation angle of the main motor 3 is and the rotation angle of auxiliary motor 4 ; Then, according to the formula in step 2013, the time for the main shaft 5 and the secondary shaft to rotate synchronously is obtained , and finally the rotation speed of the spindle 5 can be obtained and the secondary shaft rotation speed .

[0090] In particular, for the main motor 3 and the auxiliary motor 4, when the controller 14 requires the porous filter paper 2 to move Lmm through the CAN protocol, assuming that the main shaft where the main motor 3 is located has not yet been wound around the porous filter paper 2, and the secondary shaft where the auxiliary motor 4 is located is wound around new filter paper, the secondary motor 4 and the porous filter paper 2 can be regarded as a whole, as the equivalent radius of the secondary shaft.

[0091] In this embodiment, in step 2012, the thickness of the single layer of filter paper is , then the number of filter paper layers wound on the secondary shaft is , when the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft; when the secondary shaft rotates another 2π radians, the second layer is peeled off; and so on, when the secondary shaft rotates an angle of When the number of filter paper layers remaining on the secondary shaft is The relationship is ;

[0092] When the main shaft 5 rotates 2π radians, a circle of filter paper is wrapped around the main shaft 5; when the main shaft 5 rotates another 2π radians, the second layer of filter paper is wrapped around the main shaft 5; and so on. When the number of filter paper layers wound on the main shaft 5 is The relationship is .

[0093] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A paper feed device for a radioactive aerosol activity monitor, characterized by: It comprises a paper feed box (1) and a perforated filter paper (2) installed in the paper feed box (1); The paper feed box (1) is provided with a paper feed power assembly and a filter paper support assembly coordinated with the paper feed power assembly. The paper feed power assembly includes a main motor (3) and an auxiliary motor (4) both of which are arranged below the paper feed box (1). The main motor (3) and the auxiliary motor (4) are respectively arranged on both sides of the paper feed box (1). The main shaft (5) of the main motor (3) passes through the paper feed box (1) and extends to the other side of the paper feed box (1). The auxiliary shaft of the auxiliary motor (4) passes through the paper feed box (1) and extends to the other side of the paper feed box (1). The main shaft (5) and the auxiliary shaft are arranged in parallel, and the radii of the main shaft (5) and the auxiliary shaft are equal. The filter paper support assembly comprises a first filter paper shaft (7) and a second filter paper shaft (8) both of which are arranged above the paper feeder box (1); the first filter paper shaft (7) and the main motor (3) are arranged on the same side, and the second filter paper shaft (8) and the auxiliary motor (4) are arranged on the same side; a first support frame (9) is provided on the first filter paper shaft (7), and a second support frame is provided on the second filter paper shaft (8); A photoelectric switch (16) is provided on the second filter paper shaft (8); A communication interface (13) is provided at the bottom of the paper feeder box (1), and the communication interface (13) is connected to an external control box. A circuit board is provided in the control box, and a controller (14) and a memory (15) connected to the controller (14) are integrated on the circuit board. The signal output end of the photoelectric switch (16) is connected to the signal input end of the controller (14); The perforated filter paper (2) is an opaque filter paper. A plurality of detection segments are provided on the perforated filter paper (2). The plurality of detection segments are uniformly arranged in sequence along the length direction of the perforated filter paper (2), and the detection segments are arranged at the edge of the perforated filter paper (2).

2. The paper feed device of the radioactive aerosol activity monitor according to claim 1, characterized in that: The paper feeder chassis (1) comprises a chassis frame (11) and a chassis body (12) arranged in the middle of the chassis frame (11); the chassis frame (11) and the chassis body (12) are integrally formed; the chassis body (12) is a box structure with a side opening; the open side of the chassis body (12) is connected to the chassis frame (11); the main motor (3) and the auxiliary motor (4) are arranged on the inner side of the chassis body (12); the first filter paper shaft (7) and the second filter paper shaft (8), as well as the first support frame (9) and the second support frame are arranged on the outer side of the chassis body (12).

3. The paper feed device of the radioactive aerosol activity monitor according to claim 2, characterized in that: The first support frame (9) and the second support frame are both L-shaped structures, the horizontal sections of the first support frame (9) and the second support frame are both connected to the chassis body (12), the first filter paper shaft (7) is passed through the vertical section of the first support frame (9), and the second filter paper shaft (8) is passed through the vertical section of the second support frame.

4. The paper feed device of the radioactive aerosol activity monitor according to claim 3, characterized in that: A motor speed regulator (17) is also provided in the chassis body (12) and is respectively matched with the main motor (3) and the auxiliary motor (4). The motor speed regulator (17) is respectively connected to the main motor (3) and the auxiliary motor (4) through electric wires (18).

5. The paper feed device of the radioactive aerosol activity monitor according to claim 1, characterized in that: The detection section comprises two marking holes (19) and a verification hole (20) provided on the perforated filter paper (2); the verification hole (20) is arranged between the two marking holes (19); the spacing between the verification hole (20) and the two marking holes (19) is equal; the two marking holes (19) and the verification hole (20) are both provided on the same side of the perforated filter paper (2); and the spacing between two adjacent detection sections is equal to the spacing between the verification hole (20) and the marking hole (19).

6. The method for feeding paper by a paper feeding device of a radioactive aerosol activity monitor according to claim 1, characterized in that: The method comprises the following steps: Step 1: Installing filter paper: Place a new roll of perforated filter paper (2) on the secondary shaft, pull out the starting section of the new perforated filter paper (2), and overlap it on the second filter paper shaft (8) and the first filter paper shaft (7) in sequence, so that the starting section of the new perforated filter paper (2) passes through the gap between the first filter paper shaft (7) and the first support frame (9) and adheres to the main shaft (5); Step 2: Filter paper feeding, the process is as follows: Step 201: Set the rotation speed of the main motor (3) and rotation angle , and the rotation speed of the auxiliary motor (4) and rotation angle and synchronously save it to the memory (15); Step 202: The controller (14) controls the auxiliary motor (4) to rotate clockwise, and the auxiliary shaft rotates clockwise under the drive of the auxiliary motor (4); at the same time, the controller (14) controls the main motor (3) to rotate clockwise, and the main shaft (5) rotates clockwise under the drive of the main motor (3); the perforated filter paper (2) wound on the auxiliary shaft is peeled off layer by layer under the drive of the auxiliary motor (4), and the perforated filter paper (2) on the main shaft (5) is wound layer by layer under the drive of the main motor (3); Step 3, paper feeding detection: When the main motor (3) and the auxiliary motor (4) start to rotate synchronously, the controller (14) controls the photoelectric switch (16) to work, and the photoelectric switch (16) detects the paper feeding of the porous filter paper (2). When the photoelectric switch (16) detects a complete set of detection segments, the porous filter paper (2) is feeding normally; otherwise, the porous filter paper (2) is feeding abnormally, and the buzzer on the motor speed regulator (17) sounds an alarm, turning off the main motor (3) and the auxiliary motor (4), and stopping the paper feeding.

7. The method for feeding paper in a paper feeding device of a radioactive aerosol activity monitor according to claim 6, characterized in that: In step 201, according to the rotation angle of the main shaft (5) in the main motor (3), and the rotation angle of the secondary shaft in the secondary motor (4) , and the time for the main motor (3) and the auxiliary motor (4) to rotate synchronously , the rotation speed of the main shaft (5) in the main motor (3) can be obtained and the rotation speed of the secondary shaft in the secondary motor (4) , the process is as follows: Step 2011: The main shaft (5) and the secondary shaft need to keep rotating synchronously, that is, the linear speeds of the main shaft (5) and the secondary shaft are equal. ; In addition, the linear speed of the main shaft (5) and the secondary shaft can be expressed by the rotational speed, that is, ;in is the rotation speed of the main shaft (5); is the equivalent radius of the principal axis (5); is the rotation speed of the secondary shaft; is the equivalent radius of the secondary axis; Step 2012: The radii of the main axis (5) and the secondary axis are equal and both However, due to the different thickness of the filter paper wound on the main axis (5) and the secondary axis, the equivalent radius of the main axis (5) is and the equivalent radius of the secondary axis Not equal; equivalent radius of the principal axis (5) , the equivalent radius of the secondary axis ;in, is the thickness of a single layer of filter paper, is the number of layers wound on the main shaft (5), is the number of filter paper layers remaining on the secondary shaft; The remaining number of layers on the secondary axis Substituting the relationship into the equivalent radius relationship of the secondary axis, we can get ; The number of filter paper layers wound on the main shaft (5) Substituting the relationship of into the equivalent radius relationship of the main axis (5) we can get ; Step 2013: the rotation speed of the main shaft (5) and the rotation angle of the main shaft (5) The relationship between ; The rotation speed of the secondary shaft and the rotation angle of the countershaft The relationship between ; According to the relationship between the rotation speed and the rotation angle, and the relationship between the equivalent radius and the thickness of the filter paper wrapped around the axis in step 2012, the linear velocity formula of the main axis (5) and the secondary axis in step 2011 can be converted into ;in, is the time for the main shaft (5) and the secondary shaft to rotate synchronously, and the total thickness of the multiple layers of filter paper wound on the secondary shaft is ; Step 2014: When the main shaft (5) rotates 2π radians, that is, when a circle of filter paper is wrapped around the main shaft (5), the circumference of the filter paper is ; When the main shaft (5) rotates another 2π radians, the circumference of the second layer of filter paper is ; Similarly, when entangled Layer, the The perimeter of the layer is ; Sum the formula for the circumference of the filter paper wound on the main shaft (5) and Substitute into the summation formula to get the moving distance Rotation angle with respect to the main shaft (5) The functional relationship between ,but ； When the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft, and the circumference of the filter paper reduced by the secondary shaft is When the secondary shaft rotates another 2π radians, the circumference of the second layer of filter paper peeled off is ; Similarly, when the secondary shaft When the first layer of filter paper is peeled off, The circumference of the peeled filter paper layer is ; Sum the formula of the perimeter of the filter paper peeled off on the secondary axis, and Substitute into the summation formula to get the moving distance and rotation angle The functional relationship between ,but ； Therefore, when the filter paper circumference is given When the rotation angle of the main motor (3) is obtained and the rotation angle of the auxiliary motor (4) ; Then, according to the formula in step 2013, the time for the main shaft (5) and the secondary shaft to rotate synchronously is obtained , and finally the rotation speed of the spindle (5) can be obtained and the secondary shaft rotation speed .

8. The method for feeding paper in a paper feeding device of a radioactive aerosol activity monitor according to claim 7, characterized in that: In step 2012, the thickness of the single layer of filter paper is , then the number of filter paper layers wound on the secondary shaft is , when the secondary shaft rotates 2π radians, a circle of filter paper is peeled off from the secondary shaft; when the secondary shaft rotates another 2π radians, the second layer is peeled off; and so on, when the secondary shaft rotates an angle of When the number of filter paper layers remaining on the secondary shaft is The relationship is ; When the main shaft (5) rotates 2π radians, a circle of filter paper is wound around the main shaft (5); when the main shaft (5) rotates another 2π radians, the second layer of filter paper is wound around the main shaft (5); and so on. When the number of filter paper layers wound on the main shaft (5) is The relationship is .

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