A pneumatic feeding control method and feeding device for cigarette cutting grinding wheel of a cigarette receiving and assembling machine

Abstract

The present invention relates to a pneumatic feed control method for a cigarette cutting grinding wheel of a receiving and assembling machine. By counting the average working time of the cutter and the demarcation point where abnormal problems occur in cigarettes due to the cutter, the processor controls the working time of the grinding wheel separately. This technical solution uses the processor to control the working time separately according to the use time of the cutter, and performs different grinding times for cutting at different times, so that even if the thickness of the cutter increases, the thickness of the blade after grinding will not change significantly, thereby ensuring the paper cutting efficiency of the cutter and reducing the probability of abnormal paper cutting problems. It overcomes the disadvantages of rough and uneven cuts on cigarettes caused by the grinding wheel not grinding the cutter in place, and can keep the cutter sharp all the time, stabilize product quality, avoid quality risks caused by a blunt cutter, prevent the occurrence of such quality accidents, and reduce the consumption of raw and auxiliary materials.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette machinery auxiliary equipment, and in particular relates to a pneumatic feeding control method and a feeding device for a cigarette cutting grinding wheel of a cigarette assembling machine. Background Art

[0002] The current YJ29 cigarette receiving machine uses a manual grinding wheel feeding device for the final cutting of cigarettes. After the cutting blade is worn, the machine operator manually feeds the grinding wheel to sharpen the cutting blade. Specifically, the operator presses the button under the cutting blade assembly to push the push rod and use the connecting rod to drive the swing rod to swing at an angle, which then drives the screw installed on the swing rod to drive the half nut to rotate. The screw nut mechanism drives the grinding wheel installed on the pulley box assembly through the opening and closing nut seat and the bottom plate to achieve up and down position movement, thereby achieving micro-feeding of the grinding wheel. This structure has the following defects:

[0003] 1) The force applied by the manual button each time the button is pushed is inconsistent, resulting in inconsistent feed of the grinding wheel, which makes the feed of the grinding wheel unstable and constant.

[0004] 2) If the grinding wheel is not fed manually in time, it is easy to cause the cigarette cut to be rough, the cut to be not round, cigarette falling, cigarette jumping, etc., which will bring hidden dangers to product quality; increase consumption and affect equipment efficiency.

[0005] In order to overcome the above-mentioned technical problems, the inventor improved the cutting wheel feeding device of the assembly machine. The original manual button was replaced by a cylinder, and its solenoid valve was started by a PLC cumulative timer, thus realizing the timed feeding of the cutting wheel with a constant feed amount, thereby increasing the service life of the cutter.

[0006] However, during use, the inventors found that the thickness of the cutting edge of the cutter gradually increased with the extension of the use time. When a constant grinding wheel feed interval was used, the thickness of the cutting edge of the cutter gradually increased, resulting in the frequency of rough cuts, unround cuts, cigarette drops, and cigarette skipping being significantly higher in the later stage of the cutter's life than in the early stage of the cutter's use. Summary of the invention

[0007] The purpose of the present invention is to provide a pneumatic feeding control method and feeding device for a cigarette cutting grinding wheel of a cigarette assembler, so as to solve the problem that the frequency of cigarette cut roughness, unround cut, cigarette falling or cigarette jumping in the later period of the cutter's life is significantly higher than in the initial period of use of the cutter.

[0008] The present invention is achieved through the following technical solutions:

[0009] A pneumatic feeding control method for a cigarette cutting grinding wheel of a cigarette receiving and assembling machine comprises the following steps:

[0010] S1. Statistically calculate the average service life T of the cutting knife and save the average service life T in the processor;

[0011] S2. Take the time point when the frequency of abnormal cigarette sticks caused by the cutting knife problem increases within the average service life of the cutting knife as the demarcation point M;

[0012] S3. Divide the average service life of the cutting knife into a 0 - M time period and an M - T time period at the demarcation point;

[0013] S4. The processor controls the grinding wheel to feed at a first set time interval and accumulates the first set time to obtain the working duration of the cutting knife;

[0014] S5. Before each start of the grinding wheel for timed feeding, the processor judges the relationship between the working duration of the cutting knife and the average service life of the cutting knife:

[0015] When 0 < the working duration of the cutting knife < M, the processor starts the grinding wheel to feed and works for a second set time;

[0016] When M ≤ the working duration of the cutting knife < T, the processor starts the grinding wheel to feed and works for a third set time. The third set time is determined according to the following formula: the third set time = the second set time + nΔ, where n is the number of times the grinding wheel starts within the M - T time period, and n is a natural number; Δ is the set increased working time.

[0017] The demarcation point M is determined according to the median of the time points when the frequency of abnormal cigarette sticks caused by the cutting knife problem increases for each cutting knife to be statistically calculated.

[0018] Further, the range value between the minimum value and the maximum value of the time points when the frequency of abnormal cigarette sticks caused by the cutting knife problem increases for each cutting knife to be statistically calculated is used as the demarcation point M.

[0019] When the working duration of the cutting knife is within the demarcation point M range, the processor starts the grinding wheel to feed and works for a fourth set time. The fourth set time is determined according to the following formula: the fourth set time = the second set time + mΔ, where m is n / N, and N is a natural number greater than 1.

[0020] After each replacement of a new cutting knife, the processor starts accumulating from zero.

[0021] An air - operated feeding device for the cigarette - cutting grinding wheel of a cigarette assembling machine, comprising: a pulley box assembly, a lead screw - nut mechanism, a grinding wheel feeding mechanism, and a feeding control mechanism;

[0022] The lead screw - nut mechanism is connected to the pulley box assembly through a split - nut seat; the lead screw - nut mechanism is connected to the grinding wheel feeding mechanism through a lead screw shaft;

[0023] The grinding wheel feeding mechanism comprises a cylinder, a gland, a sleeve, a connecting rod, a copper sleeve, a push rod, a rocker rod and a screw seat;

[0024] The sleeve is assembled on the screw seat through a gland, the cylinder is fixed in the sleeve through a gland, and the tail end of the cylinder is connected to the control mechanism through an air pipe;

[0025] An inner circular boss is arranged in the sleeve, and the copper sleeve is fitted onto the inner circular boss;

[0026] The push rod movably passes through the copper sleeve, and one end of the push rod is connected to the piston rod of the cylinder, and the other end is connected to one end of the connecting rod, and the other end of the connecting rod is connected to the swing rod;

[0027] The swing rod is rotatably arranged in the screw seat, and the swing rod is connected and linked to one end of the screw shaft;

[0028] The feed control mechanism includes a solenoid valve and a processor; the solenoid valve is arranged on the air pipe, and the processor is connected with the solenoid valve by electrical signals.

[0029] It includes a limit switch, which is arranged on the pulley box assembly and is connected to the processor by electrical signals.

[0030] It comprises an adjusting screw, which is threadedly connected with the screw seat, and the adjusting screw is in contact with and connected with the swing rod after passing through the screw seat.

[0031] The beneficial effects of the present invention are:

[0032] The technical solution controls the working time of the cutter according to the usage time of the cutter through the processor, and performs different grinding times for the cutters at different times, so that even if the thickness of the cutter increases, the thickness of the blade after grinding will not change significantly, thereby ensuring the paper cutting efficiency of the cutter and reducing the probability of abnormal paper cutting problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a schematic diagram of the pulley box assembly, the screw nut mechanism and the grinding wheel feeding mechanism assembly;

[0035] Figure 3 Schematic diagram of the feed control mechanism.

[0036] Description of Reference Numerals

[0037] 1. Cylinder, 2. Gland, 3. Sleeve, 4. Connecting rod, 5. Copper sleeve, 6. Push rod, 7. Rocker arm, 8. Adjusting screw, 9. Screw shaft, 10. Half nut, 11. Screw seat, 12. Pulley box assembly, 13. Limit switch. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0039] like Figure 1 and Figure 2 As shown, the present application provides a pneumatic feeding device for a cigarette cutting grinding wheel of a cigarette loading machine, comprising: a pulley box assembly 12, a screw nut mechanism, a grinding wheel feeding mechanism and a feeding control mechanism; in the present application, the pulley box assembly and the screw nut mechanism are prior arts, and the specific structures of the pulley box assembly and the screw nut mechanism are not described here.

[0040] The screw nut mechanism is connected to the pulley box assembly through an opening and closing nut seat; the screw nut mechanism and the grinding wheel feeding mechanism are connected through a screw shaft; the screw shaft drives the opening and closing nut seat to feed or retract, and the opening and closing nut seat drives the pulley box assembly to perform corresponding actions. The action methods of this part are all existing technologies, and the detailed action methods are not described here.

[0041] like Figure 1 As shown, the grinding wheel feeding mechanism includes a cylinder 1, a cover plate, a pressure cover 2, a sleeve 3, a connecting rod 4, a copper sleeve 5, a push rod 6, a rocker rod 7 and a screw seat 11; in the technical solution of the present application, the cylinder is a micro cylinder, and a thread is arranged on the outer surface of the cylinder.

[0042] The sleeve is assembled on the screw seat through a cover plate, and the sleeve is connected to the screw seat. An internal thread is arranged at the outer end of the sleeve. The cylinder is threadedly connected to the sleeve, and the cylinder is fixed in the sleeve through a pressure cover to fix the position of the cylinder. The air inlet at the tail end of the cylinder is connected to the solenoid valve through an air pipe, the solenoid valve is connected to the air source, the solenoid valve is connected to the processor of the feed control mechanism by electrical signals, and the processor controls the opening of the solenoid valve and the opening time.

[0043] An inner circular boss is arranged in the sleeve, and the copper sleeve is put on the inner circular boss.

[0044] The push rod 6 movably passes through the copper sleeve, and one end of the push rod is threadedly connected to the piston rod of the cylinder to extend the length of the piston rod, and the other end of the push rod is connected to one end of the connecting rod, and the other end of the connecting rod is connected to the rocker arm 7; when the cylinder is working, the piston rod extends or contracts to drive the rocker arm to swing, thereby driving the actuators such as the screw nut mechanism and the pulley box combination to work, so as to realize the feeding of the grinding wheel.

[0045] The swing rod is rotatably arranged in the screw seat, and the swing rod is connected and linked to one end of the screw shaft; the pushing out or pulling back of the swing rod drives the screw shaft to rise or fall, thereby driving the action of the pulley box assembly.

[0046] like Figure 3 As shown, the feed control mechanism includes a solenoid valve and a processor; the solenoid valve is arranged on the air pipe, and the processor is connected to the solenoid valve by electrical signals. In this embodiment, the solenoid valve is a two-position three-way solenoid valve, and the processor includes a PLC processor and an accumulating timer.

[0047] It includes a limit switch 13, which is arranged on the pulley box assembly, and the limit switch is connected to the processor electrical signal. As the equipment is produced, the diameter of the cutter becomes smaller and smaller due to sharpening, and the sharpening wheel on the pulley box assembly is continuously moved down to compensate. A limit switch 13 is installed at the lower part of the pulley box assembly, and its position is preset. The limit position of the limit switch is set according to the radius of the minimum cutter. When the sharpening wheel installed on the pulley box assembly moves down to the minimum available radius of the cutter, the bottom of the pulley box assembly contacts the limit switch, indicating that the sharpening wheel has reached its limit position, the cutter is almost used up, the limit switch is triggered, the panel indicator light flashes to alarm, and the shutdown is delayed for 10 minutes. After replacing the cutter, the reset button is reset to restart the next automatic feeding program.

[0048] The device of the present application also includes an adjustment screw 8, which is threadedly connected to the screw seat. The adjustment screw passes through the screw seat and is in contact with the rocker arm. The contact increment between the grinding wheel and the cutter has a step range of 0 to 0.15 mm. The adjustment of the grinding wheel feed rate is controlled by the swing distance of the rocker arm driven by the micro-cylinder piston rod, and this distance can be adjusted by the adjustment screw 8. Clockwise rotation reduces the incremental step, or counterclockwise rotation increases the incremental step, the purpose of which is to adjust the swing stroke of the rocker arm so that the incremental feed of the grinding wheel is set to 0.10 mm each time.

[0049] To achieve automatic feeding of the grinding wheel, the micro cylinder uses compressed air to achieve timing work through a two-position three-way solenoid valve, which is activated by the cumulative timer. In order to prevent the micro cylinder from moving when it is stopped, causing unnecessary grinding wheel feeding, the trigger signal of the cumulative timer is taken from the start and stop signal of the cigarette cutter of the receiving machine. When the cutter working signal stops, the cumulative timer stops timing; when the cutter working signal starts, the cumulative timer continues to work. When the set interval time is reached, the processor outputs a signal to drive the solenoid valve to move, and the piston rod of the micro cylinder extends, thereby achieving automatic feeding of the grinding wheel.

[0050] The present application also includes a pneumatic feeding control method for a cigarette cutting grinding wheel of a cigarette receiving and loading machine, comprising the following steps:

[0051] Statistically calculate the average service life T of the cutting knife and save the average service life T in the processor. Specifically, conduct data statistics on the previous cutting knives, select multiple cutting knives that are working properly, count the service time of each cutting knife from installation to scrapping, and then calculate the average to obtain the average service life, denoted as T. Then, save the average service life of the cutting knife in the processor for later control. The statistics in this step can be carried out according to statistical methods.

[0052] Statistically calculate the time point M as the demarcation point when the frequency of abnormal cigarettes increases due to cutting knife problems within the average service life of the cutting knife. Specifically, count the time points when abnormal cigarettes occur due to cutting knife problems during the life cycle of each cutting knife, and record the time points when the frequency of abnormalities increases. For the time points when the frequency of abnormalities increases for all the cutting knives being statistically calculated, conduct statistics in two cases. One is to calculate the median of each time point, and the other is to determine the minimum and maximum values among all the time points.

[0053] Divide the average service life of the cutting knife into the 0 - M time period and the M - T time period at the demarcation point for separate control.

[0054] The processor controls the grinding wheel to feed at regular intervals according to the first set time interval. That is, every first set time, the accumulative timer of the processor controls the grinding wheel to start once. In this embodiment, taking the first set time as 10 minutes as an example for illustration. Each time it starts, the accumulator accumulates 10 minutes. For example, when the grinding wheel starts twice, the accumulator accumulates the sum of two 10 - minute periods, which is 20 minutes, that is, the working time of the cutting knife is 20 minutes. When the cutting knife stops midway and other situations occur, the accumulator does not return to zero. That is, when the cutting knife starts again next time, the control continues to perform the feed control according to the data in the accumulator.

[0055] Before each start of the grinding wheel for timed feeding, the processor judges the relationship between the working time of the cutting knife and the average service life of the cutting knife:

[0056] 0 < the working time of the cutting knife < M, the processor starts the grinding wheel to feed and works for the second set time. Here, it is the opening time of the electromagnetic valve controlled by the processor. When the working time of the cutting knife is within this range, the thickness at the edge of the cutting knife is relatively thin and the change is small. Therefore, the grinding time for the edge of the cutting knife is the same each time, and the impact on abnormal cigarettes is small.

[0057] M ≤ cutting tool working duration < T, the processor starts the grinding wheel feed and works for a third set time. The third set time is determined by the following formula: the third set time = the second set time + nΔ, where n is the number of times the grinding wheel needs to start within the M - T time period, and n is a natural number. That is, within the M - T time period, there are multiple first set time periods; Δ is the set increased working time. At this time, because the cutting tool has been used for a period of time, the diameter of the cutting tool decreases, and the thickness at the cutting edge has increased significantly compared to the initial stage. If the same grinding time is used, the actual cutting edge of the cutting tool is increasing. If the same grinding interval time is used, in the later stage of the interval, there will naturally be problems with abnormal cigarettes. Therefore, the third set time is such that the grinding time for each time is greater than the previous time. In this way, the thickness of the cutting edge after grinding is basically the same as the thickness of the cutting edge of the cutting tool at the initial stage, thereby reducing the probability of abnormal cigarettes caused by the cutting tool.

[0058] Specifically, at the first start within the M - T time period, that is, n = 1, the accumulator counts as 1, and the third set time of the working time length of the grinding wheel = the second set time + Δ. At the second start, the accumulator counts as 1 + 1 = 2, that is, n = 2, and the third set time = the second set time + 2Δ. At the third start, the accumulator counts as 2 + 1 = 3, that is, n = 2, and the third set time = the second set time + 3Δ, and so on.

[0059] In other technical solutions of this application, the range value between the minimum value and the maximum value of the time points when the frequency of abnormal cigarettes caused by each cutting tool due to cutting tool problems increases is used as the demarcation point M, that is, the second case of the aforementioned demarcation point. Within the range of the demarcation point M, the increase in the thickness of the cutting edge of the cutting tool has no obvious abnormal influence on the cigarettes. Therefore, the processor controls in the following manner:

[0060] When the cutting tool working duration is within the demarcation point M range, the processor starts the grinding wheel feed and works for a fourth set time. The fourth set time is determined by the following formula: the fourth set time = the second set time + mΔ, where m is n / N, and N is a natural number greater than 1. Here, for example, within the M - T time period, there are n first set time periods. When N is taken as 2, that is, when the grinding wheel starts for the first time within this time period, the working time of the grinding wheel is the second set time + 0.5Δ. When it starts for the second time, the working time of the grinding wheel is the second set time + Δ. When it starts for the third time, the working time of the grinding wheel is the second set time + 1.5Δ, and so on.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pneumatic feeding control method for a cigarette cutting grinding wheel of a cigarette receiving and assembling machine, characterized in that: Including the following steps: S1. Statistically calculate the average service life T of the cutting knife and save the average service life T in the processor; S2. Statistically calculate that within the average service life of the cutting knife, the range value between the minimum value and the maximum value of the time points when the frequency of abnormal cigarettes caused by cutting knife problems increases for each of the cutting knives to be statistically calculated is used as the demarcation point M; S3. Divide the average service life of the cutting knife into a 0-M time period and an M-T time period with the demarcation point; S4. The processor controls the grinding wheel to feed at a first set time interval regularly and accumulates the first set time to obtain the working duration of the cutting knife; S5. Before each start of the regular feeding of the grinding wheel, the processor judges the relationship between the working duration of the cutting knife and the average service life of the cutting knife: When 0 < the working duration of the cutting knife < M, the processor starts the feeding of the grinding wheel and works for a second set time; When M ≤ the working duration of the cutting knife < T, the processor starts the feeding of the grinding wheel and works for a third set time. The third set time is determined according to the following formula: the third set time = the second set time + nΔ, where n is the number of times the grinding wheel starts within the M-T time period and n is a natural number; Δ is the set increased working time; When the working duration of the cutting knife is within the demarcation point M range, the processor starts the feeding of the grinding wheel and works for a fourth set time. The fourth set time is determined according to the following formula: the fourth set time = the second set time + mΔ, where m is n / N and N is a natural number greater than 1.

2. The pneumatic feeding control method of the cigarette cutting grinding wheel of the cigarette receiving and assembling machine according to claim 1 is characterized in that: After each replacement of a new cutting knife, the processor starts accumulating from zero.

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