A cutting control method for waste mulch film rolls

Abstract

The present invention discloses a cutting control method for waste ground film rolls, which is applied to a waste ground film roll cutting machine. The cutting machine includes a ground film roll pushing mechanism, a cutting mechanism, and a detection system. The ground film roll pushing mechanism includes a chain and multiple cross bars installed on the chain, and a push plate is fixed on the cross bar; the cutting mechanism includes a cutting knife, a motor, and a lifting drive unit; the detection system includes a position sensor; the method includes: obtaining the position data of the cross bar on the chain through the position sensor; based on the position data, controlling the operation of the lifting drive unit to make the height of the cutting knife change regularly. By monitoring the cutting torque, on the one hand, the feed speed can be increased when the cutting torque is low to increase the speed of cutting the waste ground film roll, and the feed speed can be reduced when the cutting torque is high to ensure cutting safety. On the other hand, it can prevent the ground film roll from having hard debris causing an instantaneous sudden increase in the cutting torque, and can timely shut down the machine for protection to prevent damage to the cutting knife.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural residual film cutting, in particular to a cutting control method for waste ground film rolls. Background Art

[0002] Ground film is a key covering material in northern my country's agriculture, and ground film covering cultivation technology has promoted the increase of agricultural output. However, the recycling and resource utilization of waste ground film has not been effectively solved, resulting in a large amount of residual film left in the fields, causing serious pollution to the environment and attracting great attention from the country. The recycled waste ground film is usually bulky, tangled together, and mixed with sand, soil, straw and other debris, which increases the difficulty of subsequent processing and reduces the efficiency of residual film resource utilization. In order to improve the recycling efficiency of waste ground film, it needs to be cut into sections. However, existing cutting equipment is mostly used for cutting hard materials such as stone and metal, such as the cutting machine shown in patent CN108247857A. This type of cutting equipment is difficult to adapt to the continuous batch cutting needs of soft, irregular and easily deformed waste ground film rolls. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a cutting control method for waste ground film rolls that can adapt to the characteristics of waste ground film rolls and can effectively cut off the waste ground film rolls.

[0004] Technical solution: To achieve the above-mentioned purpose, the waste ground film roll cutting control method of the present invention is applied to a waste ground film roll cutting machine, the waste ground film roll cutting machine includes a table, a ground film roll pushing mechanism, a cutting mechanism and a detection system, the table includes three sub-tables, two gaps are formed between the three sub-tables, the ground film roll pushing mechanism includes a chain and a plurality of cross bars equidistantly installed on the chain, a push plate is fixed on the cross bar, the number of chains is two groups, the upper half segments of the two groups of chains are respectively placed in the two gaps, and the cross bars on the upper half segments of each group of chains are supported by the table. During operation, the waste ground film roll to be cut is placed on the table and placed between two adjacent cross bars. When the cross bar moves with the chain, the push plate pushes the waste ground film roll to move horizontally past the cutting knife; the cutting mechanism includes a cutting knife, a motor and a lifting drive unit that drives the lifting movement of the cutting knife. In this solution, the lifting drive unit is an oil cylinder; the detection system includes a position sensor;

[0005] The method comprises:

[0006] Acquiring position data of the crossbar on the chain through the position sensor;

[0007] Based on the position data, the lifting drive unit is controlled to operate so that the height of the cutting knife changes regularly; specifically, when the cross bar is placed directly below the cutting knife, the cutting knife as a whole is higher than the cross bar; when the front-to-back offset distance between the rotating axis of the cutting knife and the nearest cross bar is greater than a preset distance, the lowest point of the cutting knife is lower than the highest point of the cross bar.

[0008] Furthermore, based on the position data, controlling the operation of the lifting drive unit so that the height of the cutting knife changes regularly includes:

[0009] For each crossbar approaching the cutting knife, the displacement calculation starting point is the previous crossbar passing directly below the cutting knife; when the displacement of the crossbar reaches a first distance, the lifting drive unit is controlled to operate to cause the cutting knife to move downward;

[0010] When the displacement of the crossbar is between the first distance and the second distance, the lowest point of the cutting knife has a moment lower than the highest point of the crossbar;

[0011] When the displacement of the cross bar reaches a second distance, the lifting drive unit is controlled to operate so that the cutting knife moves upward until the cutting knife is entirely higher than the cross bar.

[0012] Furthermore, a plurality of different target displacement values ​​are set between the first distance and the second distance; when the displacement of the crossbar is between the first distance and the second distance, the moment when the lowest point of the cutting knife is lower than the highest point of the crossbar specifically includes:

[0013] Whenever the displacement of the crossbar reaches a target displacement value, a preset instruction corresponding to the target displacement value is executed, wherein the preset instruction includes raising the cutting knife, lowering the cutting knife, and maintaining the height of the cutting knife unchanged. The preset instruction also includes a target height of the cutting knife.

[0014] The distance between two adjacent crossbars is the maximum displacement S of each crossbar. A target displacement value less than S / 2 corresponds to a preset instruction to lower the cutter blade or maintain its height. A target displacement value greater than S / 2 corresponds to a preset instruction to raise the cutter blade or maintain its height. This allows the cutter blade to be gradually lowered in the first half of the crossbar's travel and gradually raised in the second half, ensuring optimal control of the cutter blade and improving the cutting effect.

[0015] Furthermore, the position sensors are inductive sensors, with multiple position sensors arranged in a linear array. As the crossbar approaches directly below the cutter, it passes each position sensor in turn, generating a trigger signal. The control system determines a target displacement value based on the number of the position sensor generating the trigger signal and executes a preset instruction corresponding to the target displacement value. This allows the cutter to gradually descend and then ascend, while maintaining simple control logic and low cost.

[0016] Furthermore, a torque sensor is provided in the transmission mechanism between the cutting knife and the motor; and the method further comprises:

[0017] collecting the cutting torque by the torque sensor;

[0018] Determining whether the cutting torque is within a preset torque range;

[0019] When the cutting torque is within a preset torque range, the chain feed speed is adjusted based on the cutting torque. Specifically, the values ​​within the preset torque range can be segmented to form multiple torque intervals, each corresponding to a feed speed. The greater the cutting torque, the slower the feed speed.

[0020] When the cutting torque exceeds the preset torque range, the operation of the chain is stopped and the cutting knife is raised.

[0021] Beneficial effects: The cutting control method of the waste mulch film roll of the present invention has the following beneficial effects:

[0022] (1) The control method of the present invention can fully adapt to the irregular and easily deformed characteristics of the waste ground film roll, and can increase the cutting feed depth of the cutter as much as possible, so that the cutter can be fed to the bottom of the table to cut the waste ground film roll, and the cutter can avoid the cross bar in time, so that the waste ground film roll is fully cut off, avoiding that part of the ground film is still connected on both sides of the cutting part and affecting subsequent processing, and preventing the cutter from colliding with the cross bar and causing damage to the cutter.

[0023] (2) By monitoring the cutting torque, on the one hand, the feed speed can be increased when the cutting torque is low to increase the speed of cutting the waste film roll, and on the other hand, the feed speed can be reduced when the cutting torque is high to ensure cutting safety. On the other hand, it can prevent the presence of hard debris in the film roll from causing a sudden increase in the cutting torque, and can stop the machine in time to prevent damage to the cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional structural diagram of a waste film roll cutting machine;

[0025] Figure 2This is the front view structural diagram of the waste film roll cutting machine;

[0026] Figure 3 A state diagram for a state of a cutting machine;

[0027] Figure 4 A state diagram for another state of the cutting machine;

[0028] Figure 5 The figure is a flow chart of a method for controlling the cutting of waste mulch rolls;

[0029] Figure 6 It is a structural diagram of the crossbar in the preferred embodiment;

[0030] Figure 7 This is a state diagram of the cutting knife when it drops to the low position in the preferred embodiment.

[0031] In the figure: 1-chain; 2-crossbar; 3-lifting drive unit; 4-cutting knife; 5-push plate; 6-table; 7-position sensor; 8-motor; 9-torque sensor. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2 The illustrated method for controlling the cutting of waste mulch rolls is applied to a waste mulch roll cutting machine. The machine comprises a table 6, a mulch roll pushing mechanism, a cutting mechanism, and a detection system. The table 6 comprises three sub-tables, with two gaps formed between them. The mulch roll pushing mechanism comprises a chain 1 and multiple crossbars 2 equidistantly mounted on the chain 1. There are two sets of chains 1, each with three push plates 5 fixed to the left, center, and right sides. The upper half segments of the two chains 1 are placed in the two gaps, respectively. The crossbars 2 on the upper half of each chain 1 are supported by the table 6, and the push plates 5 on the crossbars 2 on the upper half of the chain are higher than the crossbars 2 on which they are located. There are also two cutting mechanisms, one for each of the two gaps.

[0034] During operation, the waste ground film roll to be cut is placed on the table 6 and placed between two adjacent cross bars 2. When the cross bar 2 moves with the chain 1, the push plate 5 pushes the waste ground film roll to move horizontally past the cutting knife 4; the cutting mechanism includes the cutting knife 4, the motor 8 and the lifting drive unit 3 that drives the cutting knife 4 to move up and down. In this embodiment, the lifting drive unit 3 is an oil cylinder; the detection system includes a position sensor 7.

[0035] like Figure 5 As shown, the method includes the following steps S101-S102:

[0036] Step S101, obtaining position data of the crossbar 2 on the chain 1 through the position sensor 7;

[0037] Step S102: Based on the position data, the lifting drive unit 3 is controlled to operate so that the height of the cutting knife 4 changes regularly; specifically, when the cross bar 2 is placed directly below the cutting knife 4, the cutting knife 4 is higher than the cross bar 2 as a whole. Figure 3 When the rotation axis of the cutter 4 and the closest front and rear staggered distance of the cross bar 2 is greater than the preset distance, the lowest point of the cutter 4 is lower than the highest point of the cross bar 2, as shown; Figure 4 shown.

[0038] By adopting the above-mentioned control method, the cutting feed depth of the cutting knife 4 can be increased as much as possible, and the cutting knife can avoid the cross bar 2 in time, so that the waste film roll is fully cut off, avoiding that part of the film is still connected on both sides of the cutting part to affect subsequent processing, and preventing the cutting knife 4 from colliding with the cross bar 2 and causing damage to the cutting knife 4.

[0039] Preferably, the step S102 described above of controlling the lifting drive unit 3 to operate based on the position data so that the height of the cutting knife 4 changes regularly includes the following steps S201-S203:

[0040] Step S201: For each crossbar 2 approaching the cutting knife 4, the point where the previous crossbar 2 passes directly below the cutting knife 4 is used as a starting point for displacement calculation; when the displacement of the crossbar 2 reaches a first distance, the lifting drive unit 3 is controlled to operate so that the cutting knife 4 moves downward;

[0041] Step S202, when the displacement of the crossbar 2 is between the first distance and the second distance, and the lowest point of the cutting knife 4 is lower than the highest point of the crossbar 2;

[0042] Step S203 : When the displacement of the cross bar 2 reaches a second distance, the lifting drive unit 3 is controlled to operate so that the cutting knife 4 moves upward until the cutting knife 4 is higher than the cross bar 2 as a whole.

[0043] Preferably, a plurality of different target displacement values ​​are set between the first distance and the second distance; in the above step S202, when the displacement of the cross bar 2 is between the first distance and the second distance, the moment when the lowest point of the cutting knife 4 is lower than the highest point of the cross bar 2 specifically includes:

[0044] Whenever the displacement of the crossbar 2 reaches a target displacement value, a preset instruction corresponding to the target displacement value is executed. The preset instruction includes raising the cutting knife 4, lowering the cutting knife 4, and maintaining the height of the cutting knife unchanged. The preset instruction also includes the target height of the cutting knife 4.

[0045] The distance between two adjacent crossbars 2 is equal to the maximum displacement S of each crossbar 2. A target displacement value less than S / 2 corresponds to a preset instruction to lower the cutter 4 or maintain its height. A target displacement value greater than S / 2 corresponds to a preset instruction to raise the cutter 4 or maintain its height. A target displacement value equal to S / 2 corresponds to a preset instruction to maintain its height. This allows the cutter 4 to be gradually lowered in the first half of the crossbar 2's travel and gradually raised in the second half, ensuring optimal control of the cutter 4 and improving the cutting effect.

[0046] Preferably, if Figure 6 As shown, the crossbar 2 includes an intermediate rod 22a and two end rods 22b located at both ends of the intermediate rod 22a. The intermediate rod 22a and each end rod 22b are connected by a U-shaped avoidance piece 22c. When the crossbar 22 approaches the cutting knife 4, the top of the avoidance piece 22c is located on the side away from the cutting knife 4 relative to the intermediate rod 22a. In this way, when the cutting operation is performed, when the pressure applied by the cutting knife 4 to the residual film roll makes the residual film roll abut against the corner between the table 6 and the push plate 5, as shown in FIG. Figure 7 As shown, the cutter 4 can be fed between the middle rod 22a and the end rod 22b to cut through the residual film roll, ensuring that the residual film roll is completely cut off. In the process of cutting the residual film roll, the cutter 4 applies downward pressure to the residual film roll while also applying a lateral thrust to the residual film roll, so that the residual film roll rests on the push plate 5. When calculating the displacement of the crossbar 2, the position of the end rod 22b is determined according to the position sensor 7, and then the position determined by the position sensor 7 is compensated according to the offset distance between the end rod 22b and the bottom of the groove in the avoidance member 22c. The cutter 4 is controlled to move up and down according to the compensated position. In this way, the cutter 4 can partially enter the groove of the avoidance member 22c during the cutting process and avoid the bottom position of the groove of the avoidance member 22c.

[0047] Preferably, the position sensors 7 are inductive sensors, with multiple position sensors 7 arranged in a linear array. As the crossbar 2 approaches directly below the cutter 4, it passes each position sensor 7 in sequence, generating a trigger signal. The control system determines the target displacement value based on the number of the position sensor 7 that generated the trigger signal and executes a preset instruction corresponding to the target displacement value. This allows the cutter 4 to gradually descend and then ascend, while maintaining simple control logic and low cost.

[0048] Preferably, a torque sensor 9 is provided in the transmission mechanism between the cutting knife 4 and the motor 8; the method further comprises the following steps S301-S304:

[0049] Step S301, collecting cutting torque through the torque sensor 9;

[0050] Step S302, determining whether the cutting torque is within a preset torque range;

[0051] Step S303: When the cutting torque is within a preset torque range, the feed speed of the chain 1 is adjusted based on the cutting torque. Specifically, the values ​​within the preset torque range may be segmented to form multiple torque intervals, each corresponding to a feed speed. The greater the cutting torque, the slower the feed speed.

[0052] Step S304: When the cutting torque exceeds the preset torque range, the chain 1 is stopped and the cutting knife 4 is raised.

[0053] By monitoring the cutting torque, the feed speed can be increased when the cutting torque is low to speed up the cutting of waste film rolls, and the feed speed can be reduced when the cutting torque is high to ensure cutting safety. On the other hand, it can prevent the sudden increase in cutting torque caused by hard debris in the film roll, and can stop the machine in time to prevent damage to the cutter 4.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cutting control method for waste film rolls, which is applied to a waste film roll cutting machine, characterized in that: The waste film roll cutting machine comprises a film roll pushing mechanism, a cutting mechanism and a detection system, wherein the film roll pushing mechanism comprises a chain (1) and a plurality of cross bars (2) equidistantly mounted on the chain (1), and a push plate (5) is fixed on the cross bar (2); the cutting mechanism comprises a cutting knife (4), a motor (8) and a lifting drive unit (3) for driving the cutting knife (4) to move upward and downward; the detection system comprises a position sensor (7); The method comprises: Acquiring position data of the crossbar (2) on the chain (1) through the position sensor (7); Based on the position data, the lifting drive unit (3) is controlled to operate so that the height of the cutting knife (4) changes regularly; specifically, when the cross bar (2) is placed directly below the cutting knife (4), the cutting knife (4) is higher than the cross bar (2) as a whole; when the front-to-back offset distance between the rotation axis of the cutting knife (4) and the closest cross bar (2) is greater than a preset distance, the lowest point of the cutting knife (4) is lower than the highest point of the cross bar (2); Based on the position data, controlling the lifting drive unit (3) to operate so that the height of the cutting knife (4) changes regularly includes: For each crossbar (2) approaching the cutting knife (4), the point where the previous crossbar (2) passes directly below the cutting knife (4) is used as a starting point for displacement calculation; when the displacement of the crossbar (2) reaches a first distance, the lifting drive unit (3) is controlled to operate so that the cutting knife (4) moves downward; When the displacement of the crossbar (2) is between the first distance and the second distance, the lowest point of the cutting knife (4) is lower than the highest point of the crossbar (2); When the displacement of the crossbar (2) reaches a second distance, the lifting drive unit (3) is controlled to operate so that the cutting knife (4) moves upward until the cutting knife (4) is entirely higher than the crossbar (2).

2. The cutting control method of waste mulch roll according to claim 1, characterized in that: A plurality of different target displacement values ​​are set between the first distance and the second distance; when the displacement of the cross bar (2) is between the first distance and the second distance, the moment when the lowest point of the cutting knife (4) is lower than the highest point of the cross bar (2) specifically includes: Whenever the displacement of the crossbar (2) reaches a target displacement value, a preset instruction corresponding to the target displacement value is executed, and the preset instruction includes raising the cutting knife (4), lowering the cutting knife (4), and maintaining the height of the cutting knife unchanged.

3. The cutting control method of waste ground film roll according to claim 1, characterized in that: The position sensor (7) is an inductive sensor, and a plurality of the position sensors (7) are arranged in a linear array.

4. The cutting control method of waste film roll according to claim 1, characterized in that: A torque sensor (9) is provided in the transmission mechanism between the cutting knife (4) and the motor (8); the method further comprises: collecting the cutting torque via the torque sensor (9); Determining whether the cutting torque is within a preset torque range; When the cutting torque is within a preset torque range, adjusting the feed speed of the chain (1) based on the cutting torque; When the cutting torque exceeds the preset torque range, the operation of the chain (1) is stopped and the cutting knife (4) is raised.

Images