Method and device for automatically stopping can opening of can opener

Abstract

The present invention discloses a method and device for automatically stopping can opening of a can opener. According to the first frequency ratio of the rotation of the bearing in the first preset time is less than the second frequency of the rotation of the bearing in a subsequent second preset time during the can opening process of the can opener blade, when the difference between the second frequency and the first frequency reaches a preset value, it is considered that repeated cutting occurs, and the rotation of the blade is stopped in time to avoid problems caused by repeated cutting. At the same time, the data collection performed in the first preset time and the second preset time are collected in multiple times and the average value is taken, which avoids the problem of excessive instantaneous processing pressure and easy error of single data when only collecting data once, thereby improving the timeliness and accuracy of the first frequency and the second frequency, so as to achieve more accurate can opening control.

Description

Technical Field

[0001] The invention relates to the technical field of electronic product design, and in particular to a method and a device for automatically stopping a can opener from opening a can. Background Art

[0002] In the prior art, electric can openers are divided into two types, one is a top cutting function, and the other is a side cutting function.

[0003] A top-cut can opener has a characteristic, that is, the can opener blade must pierce the can and insert into the can to directly contact the food inside. After cutting, the opening of the can is sharper; when the motor drives the can opener blade to rotate a circle, the can lid and the body are separated, and the lid and the can opener blade pop open and reset together, driving the mechanical switch to cut off the power supply of the can opener motor, which can make the can opener stop automatically.

[0004] A side-cutting can opener has a feature, that is, the blade of the can opener cuts the sealed edge or sealing edge of the can from the side without touching the food inside, and the opening of the can is relatively smooth after cutting; however, after the motor rotates one circle, there is no transmission mechanism to drive the motor switch to automatically pop open, so the motor of the side-cutting can opener cannot stop automatically. If the user does not stop it in time, repeated side cutting will easily produce sharp iron filings and burrs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method and device for automatically stopping can opening of a can opener, so that the side can opener can complete can opening while avoiding problems caused by repeated cutting.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for automatically stopping a can opener from opening a can, comprising the steps of:

[0008] S1, starting the can opener, collecting the rotation frequency of the bearing multiple times within a first preset time and taking the average value as the first frequency, wherein the bearing is used to drive the rotation of the can opener blade;

[0009] S2. After the first preset time, collect the rotation frequency of the bearing multiple times within each second preset time and take the average value as the second frequency;

[0010] S3, determining whether the difference between the second frequency and the first frequency is greater than a preset value, if so, stopping the rotation of the can opener blade, if not, executing step S2.

[0011] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0012] A device for automatically stopping can opening of a can opener, comprising a control module, a photoelectric circuit breaker, a grating wheel, a power supply module, a bearing drive module with a bearing, and a can opener blade;

[0013] The control module is electrically connected to the power supply module, the bearing drive module and the photoelectric circuit breaker respectively; the power supply module is electrically connected to the bearing drive module and the photoelectric circuit breaker at the same time, the grating wheel is sleeved on the bearing and the movement track of the grating wheel passes through the photoelectric detection area of ​​the photoelectric circuit breaker, and the bearing is fixedly connected to the can opener blade;

[0014] The bearing drives the grating wheel to rotate, and the control module is used to execute the method of automatically stopping opening a can opener as described in steps S1 to S3.

[0015] In summary, the beneficial effects of the present invention are: providing a method and device for automatically stopping can opening of a can opener, according to which, in the process of can opening by the can opener blade, the first frequency ratio of the rotation of the bearing in the first preset time is less than the second frequency of the rotation of the bearing in a subsequent second preset time, when the difference between the second frequency and the first frequency reaches a preset value, it is considered that repeated cutting has occurred, and the rotation of the blade is stopped in time to avoid problems caused by repeated cutting. At the same time, the data collection performed in the first preset time and the second preset time are collected in multiple times and the average value is taken, which avoids the problem of excessive instantaneous processing pressure and easy error of single data when only collecting data once, thereby improving the timeliness and accuracy of the first frequency and the second frequency, so as to achieve more accurate can opening control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the steps of a method for automatically stopping a can opener from opening a can according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the overall structure of a device for automatically stopping can opening of a can opener according to an embodiment of the present invention;

[0018] Figure 3 A circuit diagram of a control module of a device for automatically stopping can opening of a can opener according to an embodiment of the present invention;

[0019] Figure 4 A schematic diagram of a photoelectric circuit breaker and its peripheral circuits of a can opener automatic stop opening device according to an embodiment of the present invention;

[0020] Figure 5 A circuit diagram of a bearing drive module of a can opener that automatically stops opening a can according to an embodiment of the present invention;

[0021] Figure 6A circuit diagram of a key switch module of a can opener for automatically stopping can opening according to an embodiment of the present invention;

[0022] Figure 7 This is a product structure diagram of a device for automatically stopping can opening of a can opener according to an embodiment of the present invention;

[0023] Figure 8 An exploded view of the product structure of a device for automatically stopping can opening of a can opener according to an embodiment of the present invention;

[0024] Description of labels:

[0025] 1. Control module; 2. Photoelectric circuit breaker; 3. Grating wheel; 4. Power supply module; 5. Bearing drive module; 6. Bearing; 7. Drive motor; 8. Drive gear assembly; 9. Key switch module;

[0026] C1, first capacitor; C2, second capacitor;

[0027] Q1, the first transistor; Q2, the thyristor; Q3, the second transistor;

[0028] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor;

[0029] S1, push button switch;

[0030] U1, main control chip. DETAILED DESCRIPTION

[0031] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0032] Please refer to Figure 1 , one A method for automatically stopping a can opener from opening a can comprises the following steps:

[0033] S1, start the can opener, collect the rotation frequency of the bearing 6 for multiple times within a first preset time and take the average value as the first frequency, the bearing 6 is used to drive the rotation of the can opener blade;

[0034] S2. After the first preset time, the rotation frequency of the bearing 6 is collected multiple times within each second preset time and the average value is recorded as the second frequency;

[0035] S3, determining whether the difference between the second frequency and the first frequency is greater than a preset value, if so, stopping the rotation of the can opener blade, if not, executing step S2.

[0036] From the above description, it can be seen that the beneficial effect of the present invention is to provide a method for automatically stopping the can opening of a can opener, according to which, in the process of the can opener blade opening the can, the first frequency ratio of the rotation of the bearing 6 in the first preset time is less than the second frequency of the rotation of the bearing 6 in a subsequent second preset time, when the difference between the second frequency and the first frequency reaches a preset value, it is considered that repeated cutting has occurred, and the rotation of the blade is stopped in time to avoid the problems caused by repeated cutting. At the same time, the data collection performed in the first preset time and the second preset time are collected in multiple times and the average value is taken, which avoids the problem of excessive pressure and long time of instantaneous processing when only collecting data once and the problem of easy error of single data, thereby improving the timeliness and accuracy of the first frequency and the second frequency, so as to achieve more accurate can opening control.

[0037] Furthermore, the preset value is specifically:

[0038] The first rotation frequency of the bearing 6 when the can opener blade cuts for the first time and the second rotation frequency of the bearing 6 when repeated cutting occurs during the process of opening multiple cans are collected, and the difference between the first rotation frequency and the second rotation frequency of each can is calculated to obtain the frequency difference of each can;

[0039] The preset value is obtained by taking an average value of all the frequency difference values ​​and multiplying it by a preset coefficient, and the preset coefficient has a value range of (0, 1).

[0040] As can be seen from the above description, the preset value is a value obtained in advance. For the same can opener blade, the first rotation frequency and the second rotation frequency when opening different cans are collected respectively and the difference between the two is calculated to obtain the frequency difference of each can. The average value of the frequency difference of each can is taken as a measure of the difference between the first frequency and the second frequency when the can opener opens the can, so as to determine whether repeated cutting occurs. Among them, the average value of the frequency difference is multiplied by the preset coefficient in order to more accurately find the time period when repeated cutting occurs when the second frequency is collected within the second preset time, so as to increase the reliability of the data.

[0041] Furthermore, starting the can opener in step S1 specifically includes:

[0042] Determine whether the key switch S1 is in the closed state for a third preset time, and if so, drive the can opener blade to rotate and record the rotation time;

[0043] After step S3, the following steps are also included:

[0044] S4. Determine whether the rotation time is greater than a longest can opening cycle. If so, stop the rotation of the can opener blade. The longest can opening cycle is greater than the sum of the first preset time and the second preset time.

[0045] From the above description, it can be seen that when the button switch S1 on the can opener is pressed and held by the user for a long time and reaches the third preset time, the can opener blade will start to rotate and start to calculate the rotation time of the can opener blade, and then execute the contents of step S1 to step S3. When the rotation time reaches the longest can opening cycle, even if the user still presses the button switch S1, the can opener blade will stop rotating to avoid the problem caused by repeated cutting.

[0046] Furthermore, the longest can opening cycle is T, then the first preset time is (0, T / 4], and the second preset time is (0, T / 10].

[0047] From the above description, it can be seen that when the can opener opens a can, in the longest can opening cycle defined as T, any time period in the length range of (0, T / 4] is taken as the first preset time, and in the remaining time, any time period in the length range of (0, T / 10] is taken as the second preset time. The time period of the second preset time is shorter than the first preset time because when the first preset time has passed, in order to more accurately find the time interval where the time node of the can opener blade repeatedly cuts in the remaining T time, the interval size of the second preset time is refined.

[0048] Furthermore, the step S1 specifically includes:

[0049] S1, start the can opener, divide the first preset time into a plurality of first preset intervals, collect the rotation frequency of the bearing 6 in each of the first preset intervals, remove the maximum value and the minimum value of all the collected rotation frequencies of the bearing 6 and calculate the average value to obtain the first frequency, the bearing 6 is used to drive the rotation of the can opener blade, and the rotation frequency of the bearing 6 collected in each of the first preset intervals is a fixed value or an average value obtained by multiple collections;

[0050] The step S2 specifically includes:

[0051] S2. After the first preset time, each second preset time is equally divided into a plurality of second preset intervals, the rotation frequency of the bearing 6 is collected in each of the second preset intervals, and the average value of all the collected rotation frequencies of the bearing 6 is taken to obtain the second frequency. The rotation frequency of the bearing 6 collected in each of the second preset intervals is a fixed value or an average value obtained by multiple collections.

[0052] From the above description, it can be seen that in order to improve the accuracy of the collected data, the first preset time and the second preset time are equally divided and the fixed value of the entire interval is collected in each equally divided time interval and the average value is obtained after multiple collections. Moreover, the rotation frequencies of all the bearings 6 collected in the first preset time are averaged after removing the maximum and minimum values ​​to obtain a more accurate first frequency.

[0053] Please refer to Figures 2 to 8 , a device for automatically stopping can opening of a can opener, comprising a control module 1, a photoelectric circuit breaker 2, a grating wheel 3, a power supply module 4, a bearing drive module 5 with a bearing 6 and a can opener blade;

[0054] The control module 1 is electrically connected to the power supply module 4, the bearing drive module 5 and the photoelectric circuit breaker 2 respectively, and the power supply module 4 is electrically connected to the bearing drive module 5 and the photoelectric circuit breaker 2 at the same time. The grating wheel 3 is sleeved on the bearing 6 and the movement track of the grating wheel 3 passes through the photoelectric detection area of ​​the photoelectric circuit breaker 2. The bearing 6 is fixedly connected to the can opener blade;

[0055] The bearing 6 drives the grating wheel 3 to rotate, and the control module 1 is used to execute a method for automatically stopping opening a can opener as described in steps S1 to S3.

[0056] From the above description, it can be seen that the beneficial effect of the present invention is: to provide a device for automatically stopping opening a can opener, according to which during the can opening process of the can opener blade, a first frequency ratio of the rotation of the bearing 6 within a first preset time is less than a second frequency ratio of the rotation of the bearing 6 within a subsequent second preset time, when the difference between the second frequency and the first frequency reaches a preset value, it is considered that repeated cutting has occurred, and the rotation of the blade is stopped in time to avoid problems caused by repeated cutting.

[0057] Furthermore, the control module 1 includes a main control chip U1 and a first capacitor C1;

[0058] One end of the first capacitor C1 is connected to the power supply voltage input pin of the main control chip U1 and the power supply end of the power supply module 4 at the same time, and the other end is connected to the ground pin of the main control chip U1.

[0059] From the above description, it can be known that the above are the main control chip U1 and its peripheral circuits on the control module 1. The first capacitor C1 plays a filtering role.

[0060] Furthermore, it also includes a first resistor R1, a second resistor R2 and a second capacitor C2;

[0061] One end of the first resistor R1 is connected to the first serial input / output port of the main control chip U1, and the other end is connected to the positive pin of the light emitting diode of the photoelectric circuit breaker 2, and one end of the second capacitor C2 is simultaneously connected to the collector pin of the phototransistor of the photoelectric circuit breaker 2, one end of the second resistor R2 and the second serial input / output port of the main control chip U1;

[0062] The other end of the second resistor R2 is connected to the power supply end of the power supply module 4 , and the other end of the second capacitor C2 , the cathode pin of the light emitting diode of the photoelectric circuit breaker 2 , and the emitter pin of the phototransistor are all grounded.

[0063] From the above description, it can be known that the above is the circuit of the connecting part of the main control chip U1 and the photoelectric circuit breaker 2. The main control chip U1 is connected to the light emitting diode on the photoelectric circuit breaker 2 through the first serial input and output port to power it, so that it emits a light beam, and receives the electrical signal from the phototransistor on the photoelectric circuit breaker 2 through the second serial input and output port. The frequency change of the electrical signal corresponds to: the grating wheel 3 repeatedly reflects the light beam from the photoelectric circuit breaker 2 to the phototransistor when the bearing 6 rotates, causing the change of the electrical signal output by the phototransistor, that is, the rotation frequency of the bearing 6 changes.

[0064] Further, the bearing 6 driving module 5 includes a driving motor 7, a driving gear assembly 8, a first transistor Q1, a thyristor Q2, a third resistor R3 and a fourth resistor R4;

[0065] One end of the third resistor R3 is connected to the third serial input / output port of the main control chip U1, and the other end is connected to the base of the first transistor Q1, one end of the fourth resistor R4 is connected to the collector of the first transistor Q1, and the other end is connected to the power control electrode of the thyristor Q2, the positive electrode of the thyristor Q2 is connected to the negative electrode of the drive motor 7, and the positive electrode of the drive motor 7 is connected to the power supply end of the power supply module 4;

[0066] The emitter of the first transistor Q1 and the negative electrode of the thyristor Q2 are both grounded, the bearing 6 is assembled on the driving motor 7, one end of the driving gear assembly 8 is sleeved on the bearing 6, and the other end is fixedly connected to the can opener blade, and the first transistor Q1 and the thyristor Q2 are both NPN type.

[0067] From the above description, it can be known that when the bearing is controlled to drive the can opener blade to rotate, the main control chip U1 outputs a high level through the third serial input and output port, so that the first transistor Q1 is turned on and the thyristor Q2 is turned on successively. The power supply end output value of the power supply module 4 is driven to the motor 7, so that the drive motor 7 drives the bearing 6 to rotate, and then the can opener blade also starts to rotate.

[0068] Furthermore, it also includes a key switch module 9, which includes a key switch S1, a second transistor Q3, a fourth resistor R4 and a fifth resistor R5, and the positive electrode of the drive motor 7 is connected to the power supply end of the power supply module 4 and replaced by:

[0069] One end of the key switch S1 is connected to the power supply end of the power supply module 4, and the other end is connected to the positive electrode of the drive motor 7 and one end of the fourth resistor R4 at the same time; the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the base of the second transistor Q3, and the collector of the second transistor Q3 is connected to the fourth serial input and output port of the main control chip U1;

[0070] The emitter of the second transistor Q3 is grounded, and the second transistor Q3 is of NPN type.

[0071] From the above description, it can be seen that a key switch module 9 is added between the drive motor 7 and the power supply module 4. The fourth serial input and output port of the main control chip U1 is connected to the collector of the second transistor Q3. Only when the key switch S1 is pressed, the power supply end output of the power supply module 4 can output the value to the drive motor 7; the second transistor Q3 will be turned on; the main control chip U1 can receive the electrical signal from the key switch module 9, thereby controlling the drive motor 7 to work.

[0072] The method or device for automatically stopping can opening of a can opener described in the following embodiments is suitable for a can opener that uses a side cutting method to open a can, and can perform a side cutting can opening action with automatic stop on different kinds of cans.

[0073] Please refer to Figure 1 , Embodiment 1 of the present invention is:

[0074] A method for automatically stopping a can opener from opening a can, comprising the steps of:

[0075] S1, start the can opener, collect the rotation frequency of the bearing 6 multiple times within a first preset time and take the average value as the first frequency, the bearing 6 is used to drive the rotation of the can opener blade;

[0076] S2, after the first preset time, collecting the rotation frequency of the bearing 6 multiple times within each second preset time and taking the average value as the second frequency;

[0077] S3, determining whether the difference between the second frequency and the first frequency is greater than a preset value, if so, stopping the rotation of the can opener blade, if not, executing step S2.

[0078] In this embodiment, the preset value is specifically:

[0079] The first rotation frequency of the bearing 6 when the can opener blade cuts for the first time and the second rotation frequency of the bearing 6 when repeated cutting occurs are collected during the process of opening multiple cans, and the difference between the first rotation frequency and the second rotation frequency of each can is calculated to obtain the frequency difference of each can;

[0080] Take the average value of all frequency differences and multiply it by the preset coefficient to obtain the preset value, and the preset coefficient has a value range of (0,1). Specifically, the calculation formula for the average value of all frequency differences is as follows:

[0081] θ=[(H1-G1)+(H2-G2)+(H3-G3)+…+(Hm-Gm)]÷m

[0082] Among them, θ is the average value of all frequency differences; G1, G2, G3...Gm are the first rotation frequencies corresponding to the side cutting of different kinds of cans by the can opener blade; H1, H2, H3...Hm are the second rotation frequencies corresponding to the side cutting of different kinds of cans by the can opener blade; m is the number of can types.

[0083] In this embodiment, starting the can opener in step S1 specifically includes:

[0084] Determine whether the key switch S1 is in the closed state for a third preset time, and if so, drive the can opener blade to rotate and record the rotation time;

[0085] After step S3, the following steps are also included:

[0086] S4. Determine whether the rotation time is greater than the longest can opening cycle. If so, stop the rotation of the can opener blade. The longest can opening cycle is greater than the sum of the first preset time and the second preset time.

[0087] It can be seen that the can opener blade needs the user to press and hold the button switch S1 to start rotating. When the rotation time of the can opener blade reaches the longest can opening cycle, the can opener blade will stop rotating even if the user still presses the button switch S1.

[0088] In this embodiment, the basis for the above implementation content is that for a side-cutting can opener, a certain resistance will be generated when the can opener blade cuts through the sealed edge or sealed edge of the can for the first time. At this time, since the bearing 6 on the bearing drive module 5 drives the can opener blade to rotate, the rotation frequency of the bearing 6 will be relatively stable near a frequency value, that is, the first frequency mentioned in this embodiment; at the same time, a V-shaped cutting groove will be left on the side edge of the can. We define it as a V-groove track. When the can opener completes a can opening process. At this time, if the can opener blade does not stop, the can opener blade will definitely pass through the original V-groove track again. At this time, the resistance encountered by the can opener blade will be smaller than the resistance of the original first can opening, and the corresponding rotation frequency of the bearing 6 will also change to near another rotation frequency value, that is, the second frequency in this embodiment. After multiple verifications, a conclusion is drawn: the second frequency must be greater than the first frequency. Therefore, for the same can opener, an experiment corresponding to the specific content of the above preset value is pre-performed in this embodiment, and the preset value is obtained as a reference basis for how much the second frequency must be greater than the first frequency. Then, the above steps S1 to S3 are implemented in the actual can opener process to determine the time when the can opener blade cuts repeatedly, and stop rotating the can opener blade in time to avoid problems caused by repeated cutting.

[0089] In addition, in this embodiment, considering that the time node of repeated cutting by the can opener blade at a second preset time is divided into two parts, before and after repeated cutting, the time length before repeated cutting accounts for a large proportion in the second preset time, resulting in the second frequency after the overall and the part after repeated cutting being averaged not meeting the condition that the difference between the second frequency and the first frequency is greater than the preset value, and the repeated cutting is mistakenly considered not to have occurred within the second preset time. The preset value in this embodiment is multiplied by a preset coefficient of (0,1) to reduce the error caused by the above situation. The specific preset number size can be determined according to actual conditions.

[0090] Please refer to Figure 1 , Embodiment 2 of the present invention is:

[0091] A method for automatically stopping a can opener from opening a can, based on the above-mentioned embodiment 1, step S1 specifically comprises:

[0092] S1, start the can opener, divide the first preset time into a plurality of first preset intervals, collect the rotation frequency of the bearing 6 in each first preset interval, remove the maximum value and the minimum value of all the collected rotation frequencies of the bearing 6 and calculate the average value to obtain the first frequency, the bearing 6 is used to drive the rotation of the can opener blade, and the rotation frequency of the bearing 6 collected in each first preset interval is a fixed value or an average value obtained by multiple collections;

[0093] Step S2 specifically includes:

[0094] S2. After the first preset time, each second preset time is equally divided into multiple second preset intervals, the rotation frequency of the bearing 6 is collected in each second preset interval, and the average value of all the collected rotation frequencies of the bearing 6 is taken to obtain the second frequency. The rotation frequency of the bearing 6 collected in each second preset interval is a fixed value or an average value obtained by multiple collections.

[0095] In this embodiment, it is assumed that the longest can opening cycle is T; the first preset time is T / 4; and the second preset time is T / 10. A specific application process of this embodiment is:

[0096] In a can opening cycle T, take T / 4 as the first preset time, and divide it into n first preset intervals. Among them, n can be set according to the actual application situation. In the time of 1 / 4T, the rotation frequency data of the bearing 6 in each preset interval is divided into n groups for processing, the first group of data is defined as x1, the second group of data is defined as x2, the third group of data is defined as x3... The nth group of data is defined as xn; each group of data can be a sampled fixed value or average value. Then, remove one of the maximum and one of the minimum values, and calculate according to the following formula:

[0097] f1=[x1+x2+x3+…+x(n-2)]÷(n-2)

[0098] Wherein, f1 is the first frequency.

[0099] Then, in the remaining T cycle time, every T / 10 time is divided into 5 groups of data, each group of data can be a sampled fixed value or average value. The first group of data is defined as y1, the second group of data is defined as y2... The fifth group of data is defined as y5 and is calculated according to the following formula:

[0100] f2=[y1+y2+…+y5]÷5

[0101] Wherein, f2 is the second frequency.

[0102] Finally, calculate whether the difference between the second frequency and the first frequency is greater than the preset value. If so, stop the rotation of the can opener blade. If not, continue to collect the new second frequency within the next T / 10 time, and then perform the above calculation and judgment.

[0103] Please refer to Figure 2 , Figure 7 and Figure 8 , Embodiment 3 of the present invention is:

[0104] A device for automatically stopping can opening of a can opener, comprising a control module 1, a photoelectric circuit breaker 2, a grating wheel 3, a power supply module 4, a bearing drive module 5 with a bearing 6, and a can opener blade;

[0105] The control module 1 is electrically connected to the power supply module 4, the bearing drive module 5 and the photoelectric circuit breaker 2 respectively, the power supply module 4 is electrically connected to the bearing drive module 5 and the photoelectric circuit breaker 2 at the same time, the grating wheel 3 is sleeved on the bearing 6 and the movement track of the grating wheel 3 passes through the photoelectric detection area of ​​the photoelectric circuit breaker 2, and the bearing 6 is fixedly connected to the can opener blade;

[0106] The bearing 6 drives the grating wheel 3 to rotate, and the control module 1 is used to execute the method of automatically stopping the can opener from opening a can in the first embodiment.

[0107] In this embodiment, as the grating wheel 3 rotates with the bearing 6, the grating wheel 3 will reflect the light beam from the photoelectric interrupter 2 once each time it completes one rotation, so that the light intensity received by the photoelectric interrupter 2 changes with the rotation of the grating wheel 3, and then the photoelectric interrupter 2 outputs an electrical signal representing the corresponding change. The control module 1 can obtain the frequency value of the bearing 6 rotation and its change through the electrical signal.

[0108] Please refer to Figures 3 to 6 , Embodiment 4 of the present invention is:

[0109] A device for automatically stopping the can opener, based on the above-mentioned third embodiment, as Figure 4 The control module 1 includes a main control chip U1 and a first capacitor C1, wherein one end of the first capacitor C1 is connected to the power supply voltage input pin of the main control chip U1 and the power supply end of the power supply module 4, and the other end is connected to the ground pin of the main control chip U1.

[0110] like Figure 3 and 4 As shown, it also includes a first resistor R1, a second resistor R2 and a second capacitor C2. Among them, one end of the first resistor R1 is connected to the first serial input and output port of the main control chip U1, and the other end is connected to the positive electrode pin of the light emitting diode of the photoelectric circuit breaker 2, and one end of the second capacitor C2 is simultaneously connected to the collector pin of the phototransistor of the photoelectric circuit breaker 2, one end of the second resistor R2 and the second serial input and output port of the main control chip U1;

[0111] The other end of the second resistor R2 is connected to the power supply end of the power supply module 4 , and the other end of the second capacitor C2 , the cathode pin of the light emitting diode of the photoelectric circuit breaker 2 and the emitter pin of the phototransistor are all grounded.

[0112] From the above description, it can be known that the above is the circuit of the connecting part of the main control chip U1 and the photoelectric circuit breaker 2. The main control chip U1 is connected to the light emitting diode on the photoelectric circuit breaker 2 through the first serial input and output port to power it, so that it emits a light beam, and receives the electrical signal from the phototransistor on the photoelectric circuit breaker 2 through the second serial input and output port. The frequency change of the electrical signal corresponds to: the grating wheel 3 repeatedly reflects the light beam from the photoelectric circuit breaker 2 to the phototransistor when the bearing 6 rotates, causing the change of the electrical signal output by the phototransistor, that is, the rotation frequency of the bearing 6 changes.

[0113] like Figure 3 and Figure 5 As shown, the bearing 6 driving module 5 includes a driving motor 7, a driving gear assembly 8, a first transistor Q1, a thyristor Q2, a third resistor R3 and a fourth resistor R4. Among them, one end of the third resistor R3 is connected to the third serial input and output port of the main control chip U1, and the other end is connected to the base of the first transistor Q1, one end of the fourth resistor R4 is connected to the collector of the first transistor Q1, and the other end is connected to the base of the thyristor Q2, the collector of the thyristor Q2 is connected to the negative electrode of the driving motor 7, and the positive electrode of the driving motor 7 is connected to the power supply end of the power supply module 4;

[0114] The emitter of the first transistor Q1 and the emitter of the second transistor are both grounded, the bearing 6 is assembled on the driving motor 7, one end of the driving gear assembly 8 is sleeved on the bearing 6, and the other end is fixedly connected to the can opener blade, and the first transistor Q1 is an NPN type.

[0115] like Figure 3 , Figure 5 and Figure 6 As shown, it also includes a key switch module 9, which includes a key switch, a second transistor Q3, a fourth resistor R4 and a fifth resistor R5. The positive electrode of the drive motor 7 is connected to the power supply end of the power supply module 4 and replaced by:

[0116] One end of the key switch S1 is connected to the power supply end of the power supply module 4, and the other end is connected to the positive electrode of the drive motor 7 and one end of the fourth resistor R4 at the same time; the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the base of the second transistor Q3, and the collector of the second transistor Q3 is connected to the fourth serial input and output port of the main control chip U1;

[0117] The emitter of the second transistor Q3 is grounded, and the second transistor Q3 is of NPN type.

[0118] In this embodiment, the above is a specific circuit connection diagram of the can opener device in this embodiment. A specific application process of this embodiment is as follows:

[0119] If the user keeps pressing the key switch S1, the fourth serial input / output port of the main control chip U1 will detect a square wave signal (50-60 Hz), and the first serial input / output port of the main control chip U1 will output a high level, starting the photoelectric circuit breaker 2. At the same time, the third serial input / output port of the main control chip U1 outputs a high level, so that the first transistor Q1 and the thyristor Q2 are turned on successively, and the drive motor 7 is started. The drive motor 7 starts to drive the grating wheel 3 on the bearing 6 to rotate. During the switching process of the can opener blade, the main control chip U1 will receive a frequency signal from the photoelectric circuit breaker 2 within the first preset time and the second preset time, and undergo some data processing in the above-mentioned embodiment one or two. When the collected data reaches the conditions mentioned in step S3 in the above-mentioned example, the main control chip U1 stops driving the motor 7, and the can opener blade also stops.

[0120] In this embodiment, the design of the power supply module 4 adopts a low-cost RC buck mode with a voltage regulator diode for power supply. In other equivalent embodiments, the design of the power supply module 4 can also be replaced by an isolated or non-isolated switching power supply solution and a DC-DC buck or LDO buck.

[0121] In this embodiment, the main control chip U1 is an 8-bit single-chip microcomputer in a simple sop-8 package. In other embodiments, the main control chip U1 can be implemented using different 8-bit, 16-bit or 32-bit single-chip microcomputer chips and different packaging methods.

[0122] like Figures 7 and 8 As shown, Figure 7 and Figure 8 A specific product design drawing of the present invention is involved, in which the grating wheel 3, drive motor 7 and other components are all arranged inside.

[0123] In other embodiments, the thyristor Q2 of the bearing drive module 5 can also be replaced by a thyristor Q2 of a different type or by setting a relay, which can also achieve the effect of controlling the drive motor 7 to work or stop.

[0124] In summary, the present invention discloses a method and device for automatically stopping a can opener from opening a can. In the process of the can opener blade opening a can, the first frequency ratio of the bearing rotation in the first preset time is less than the second frequency of the bearing rotation in a subsequent second preset time. When the difference between the second frequency and the first frequency reaches a preset value, it is considered that repeated cutting has occurred, and the rotation of the blade is stopped in time. In addition, due to the needs of algorithm processing, the data collection performed in the first preset time and the second preset time is divided into multiple times and the average value is taken, and the rotation frequency of all bearings collected in the first preset time is averaged after removing the maximum and minimum values, so as to further improve the accuracy of the first frequency and the second frequency. The preset value is determined through experimental experience and data, which improves its reliability as a basis for judgment, so that the present invention can effectively avoid the problem caused by repeated cutting while the side can opener completes the can opening.

[0125] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for automatically stopping a can opener from opening a can. It is characterized in that Includes steps: S1, starting the can opener, collecting the rotation frequency of the bearing multiple times within a first preset time and taking the average value as the first frequency, wherein the bearing is used to drive the rotation of the can opener blade; S2. After the first preset time, collect the rotation frequency of the bearing multiple times within each second preset time and take the average value as the second frequency; S3, determining whether the difference between the second frequency and the first frequency is greater than a preset value, if so, stopping the rotation of the can opener blade, if not, executing step S2; The preset values ​​are specifically: Collecting the first rotation frequency of the bearing when the can opener blade cuts for the first time and the second rotation frequency of the bearing when repeated cutting occurs during the process of opening multiple cans, and performing a difference calculation between the first rotation frequency and the second rotation frequency of each can to obtain a frequency difference of each can; Taking an average value of all the frequency differences and multiplying it by a preset coefficient to obtain the preset value, where the preset coefficient has a value range of (0, 1); The step S1 of starting the can opener specifically includes: Determine whether the key switch is in the closed state for a third preset time, and if so, drive the can opener blade to rotate and record the rotation time, wherein the closed state is the closed state of the key switch being pressed; After step S3, the following steps are also included: S4, determining whether the rotation time is greater than a longest can opening cycle, and if so, stopping the rotation of the can opener blade, wherein the longest can opening cycle is greater than the sum of the first preset time and the second preset time; The step S1 specifically includes: S1, start the can opener, divide the first preset time into a plurality of first preset intervals, collect the rotation frequency of the bearing in each of the first preset intervals, remove the maximum value and the minimum value of all the collected rotation frequencies of the bearing and calculate the average value to obtain the first frequency, the bearing is used to drive the rotation of the can opener blade, and the rotation frequency of the bearing collected in each of the first preset intervals is a sampled fixed value or an average value obtained by multiple collections; The step S2 specifically includes: S2. After the first preset time, each second preset time is equally divided into multiple second preset intervals, the rotation frequency of the bearing is collected in each second preset interval, and the average of all the collected rotation frequencies of the bearing is taken to obtain the second frequency. The rotation frequency of the bearing collected in each second preset interval is a sampled constant value or an average value obtained by multiple collections.

2. A method for automatically stopping a can opener from opening a can according to claim 1, It is characterized in that The longest can opening cycle is T, then the first preset time is (0, T / 4], and the second preset time is (0, T / 10].

3. A device for automatically stopping the can opener from opening the can. It is characterized in that Includes a control module, a photoelectric circuit breaker, a grating wheel, a power supply module, a bearing drive module with a bearing, and a can opener blade; The control module is electrically connected to the power supply module, the bearing drive module and the photoelectric circuit breaker respectively, the power supply module is electrically connected to the bearing drive module and the photoelectric circuit breaker at the same time, the grating wheel is sleeved on the bearing and the motion track of the grating wheel passes through the photoelectric detection area of ​​the photoelectric circuit breaker, and the bearing is fixedly connected to the can opener blade; The bearing drives the grating wheel to rotate, and the control module is used to execute the method for automatically stopping can opening of a can opener as described in claim 1.

4. A device for automatically stopping can opening of a can opener according to claim 3, It is characterized in that The control module includes a main control chip and a first capacitor; One end of the first capacitor is connected to the power supply voltage input pin of the main control chip and the power supply end of the power supply module, and the other end is connected to the ground pin of the main control chip.

5. A device for automatically stopping can opening of a can opener according to claim 4, It is characterized in that Also includes a first resistor, a second resistor and a second capacitor; One end of the first resistor is connected to the first serial input / output port of the main control chip, and the other end is connected to the positive pin of the light emitting diode of the photoelectric circuit breaker, and one end of the second capacitor is simultaneously connected to the collector pin of the phototransistor of the photoelectric circuit breaker, one end of the second resistor and the second serial input / output port of the main control chip; The other end of the second resistor is connected to the power supply end of the power supply module, and the other end of the second capacitor, the cathode pin of the light emitting diode of the photoelectric circuit breaker and the emitter pin of the phototransistor are all grounded.

6. A device for automatically stopping can opening of a can opener according to claim 4, It is characterized in that The bearing driving module includes a driving motor, a driving gear, a first transistor, a thyristor, a third resistor and a fourth resistor; One end of the third resistor is connected to the third serial input / output port of the main control chip, and the other end is connected to the base of the first transistor, one end of the fourth resistor is connected to the collector of the first transistor, and the other end is connected to the power control electrode of the thyristor, the positive electrode of the thyristor is connected to the negative electrode of the drive motor, and the positive electrode of the drive motor is connected to the power supply end of the power supply module; The emitter of the first transistor and the negative electrode of the thyristor are both grounded, the bearing is assembled on the driving motor, one end of the driving gear is sleeved on the bearing, and the other end is fixedly connected to the can opener blade, and the first transistor is an NPN type.

7. A device for automatically stopping can opening of a can opener according to claim 6, It is characterized in that It also includes a key switch, a second triode, a fourth resistor and a fifth resistor, and the positive electrode of the driving motor is connected to the power supply end of the power supply module and replaced by: One end of the key switch is connected to the power supply end of the power supply module, and the other end is connected to the positive electrode of the drive motor and one end of the fourth resistor at the same time; the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the base of the second transistor, and the collector of the second transistor is connected to the fourth serial input and output port of the main control chip; The emitter of the second transistor is grounded, and the second transistor is of NPN type.

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