An automatic packaging device for PP strapping tape

Abstract

The present invention relates to the field of automatic packaging technology, and in particular to an automatic packaging device for PP strapping tape, comprising: a supply module for conveying goods and PP strapping tape to a packaging position respectively; a packaging module for packaging the goods, comprising a strapping unit arranged above the conveying unit for strapping the goods and a cutting unit arranged below the strapping unit for cutting the strapped PP strapping tape; a control module for adjusting the tension of the PP strapping tape or adjusting the supply speed of the PP strapping tape according to the proportion of successful strapping times of the PP strapping tape when judging that the running stability of the automatic packaging device does not meet the requirements according to the variance of the offset of the PP strapping tape, and adjusting the cutting pressure of the strapping tape cutter in combination with the proportion of successful strapping times of the PP strapping tape and the average strapping time of the PP strapping tape. The present invention improves the running stability of the automatic packaging device.

Description

Technical Field

[0001] The invention relates to the technical field of automatic packaging, in particular to an automatic packaging device for PP packing tape. Background Art

[0002] In the prior art, PP strapping tape is a plastic strapping tape formed by extrusion and unidirectional stretching with polypropylene as the main material. PP strapping tape is usually used to bundle goods, packaging boxes, building materials, pipes and other items. It is a very convenient and fast packaging method that saves manpower and time. However, sometimes the strapping tape becomes loose and the roller part does not slide smoothly, which makes the operation stability of the automatic packaging device insufficient.

[0003] Chinese Patent Publication No.: CN105035391A discloses an automatic packaging system for light steel keels, comprising an unpowered roller line, a lifting and transplanting device, a conveyor belt one, an inner turning mechanism, a conveyor belt two, a "cross" code bundling mechanism, a conveyor roller line, a PP strapping machine, a palletizer, a rotating conveyor roller, a packaging machine and an automatic control device for the entire system, wherein the unpowered roller line is connected to the end of the light steel keel production line, the unpowered roller line, the lifting and transplanting device, a conveyor belt one, an inner turning mechanism, a conveyor belt two, a "cross" code bundling mechanism, a conveyor roller line, a PP strapping machine, a palletizer, a rotating conveyor roller, a packaging machine and an automatic control device for the entire system. The conveyor roller and the baler are connected in sequence. The formed fixed-length keels on the light steel keel production line are conveyed to the lifting and transplanting device through the unpowered roller line for steering. The keels are conveyed to the inner-closing flipping mechanism in sequence through the conveyor belt one to achieve the staggered buckling of two adjacent keels. The two buckled keels are conveyed to the "cross"-shaped bundling mechanism through the conveyor belt two for bundling. Then the conveyor roller line conveys the paired buckled keels into the PP strapping machine for PP strapping, and then into the palletizing machine for palletizing. The keels are conveyed to the rotating conveyor roller through the conveyor roller to rotate 90° and conveyed to the baler to achieve fully automatic packaging of light steel keels. It can be seen that the automatic packaging system of light steel keels has the problem that dust and oil accumulate on the surface of the roller used to convey the strapping tape, which increases the friction between the roller and the strapping tape, resulting in unsmooth supply of the strapping tape, and then causes the position of the PP strapping tape to shift, thereby reducing the operating stability of the automatic packaging device. Summary of the invention

[0004] To this end, the present invention provides an automatic packaging device for PP strapping tape, which is used to overcome the problem in the prior art that dust and oil accumulate on the surface of the roller used to convey the strapping tape, resulting in increased friction between the roller and the strapping tape, causing unsmooth supply of the strapping tape, and further causing the position of the PP strapping tape to shift, thereby reducing the operating stability of the automatic packaging device.

[0005] To achieve the above-mentioned object, the present invention provides an automatic packaging device for PP strapping tape, comprising: a supply module, for conveying goods and PP strapping tape to a packaging position respectively, comprising a conveying unit for conveying the goods and a supply unit for conveying the PP strapping tape, wherein the supply unit comprises a supply motor for providing conveying power for the PP strapping tape; a packaging module, which is connected to the supply module, for packaging the goods, comprising a strapping unit arranged above the conveying unit for strapping the goods and a cutting unit arranged below the strapping unit for cutting the strapped PP strapping tape, wherein the cutting unit comprises a strapping tape cutter for cutting the PP strapping tape; a control module, which is respectively connected to the supply module and the packaging module, for adjusting the tension of the PP strapping tape or adjusting the supply speed of the PP strapping tape according to the proportion of successful strapping times of the PP strapping tape when determining that the running stability of the automatic packaging device does not meet the requirements according to the variance of the offset of the PP strapping tape, and adjusting the cutting pressure of the strapping tape cutter in combination with the proportion of successful strapping times of the PP strapping tape and the average strapping time of the PP strapping tape.

[0006] Furthermore, the control module is also used to calculate the variance of the offset of the PP strapping tape according to the obtained offsets of the several PP strapping tapes that have been strapped, and to determine that the operation stability of the automatic packaging device does not meet the requirements when the variance of the offset of the PP strapping tape meets the first variance condition or the second variance condition;

[0007] Among them, the first variance condition is that the variance of the offset of the PP strapping tape is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the offset of the PP strapping tape is greater than the preset second variance.

[0008] Furthermore, when the variance of the offset of the PP strapping tape only satisfies the first variance condition, the control module determines the packaging effectiveness of the PP strapping tape in combination with the proportion of successful strapping times of the PP strapping tape.

[0009] Further, the control module increases the tension of the PP strapping tape when the variance of the offset of the PP strapping tape only satisfies the second variance condition;

[0010] The increase range of the tension of the PP strapping tape is determined by the difference between the variance of the offset of the PP strapping tape and a preset second variance.

[0011] Further, the control module is also used to calculate the proportion of successful PP strapping times according to the acquired number of successful PP strapping times and the total number of PP strapping times, and, when the proportion of successful PP strapping times satisfies the first proportion condition or the second proportion condition, determine that the packaging effectiveness of the PP strapping does not meet the requirements;

[0012] Among them, the first proportion condition is that the proportion of successful times of PP strapping is greater than the preset first proportion and less than or equal to the preset second proportion; the second proportion condition is that the proportion of successful times of PP strapping is greater than the preset second proportion.

[0013] Furthermore, the proportion of successful times of PP strapping is the ratio of successful times of PP strapping to the total times of PP strapping.

[0014] Furthermore, when the proportion of the number of successful strapping of the PP strapping tape only meets the second proportion condition, the control module determines the operation stability of the cutting unit in combination with the average strapping time of the PP strapping tape.

[0015] Furthermore, the control module reduces the supply speed of the PP strapping tape when the proportion of the number of successful strapping of the PP strapping tape only meets the first proportion condition;

[0016] The reduction range of the supply speed of the PP strapping tape is determined by the difference between the proportion of successful strapping times of the PP strapping tape and a preset first proportion.

[0017] Furthermore, the control module is also used to calculate the average packing time of the PP packing tape according to the obtained packing time of the PP packing tape during several packing times, and when the average packing time of the PP packing tape is greater than the preset packing time, determine that the operating stability of the cutting unit does not meet the requirements, and increase the cutting pressure of the packing tape cutter.

[0018] Furthermore, the increase range of the cutting pressure of the strapping tape cutter is determined by the difference between the average strapping time of the PP strapping tape and the preset strapping time.

[0019] Compared with the prior art, the beneficial effect of the present invention lies in that the device of the present invention adjusts the tension of the PP strapping tape according to the variance of the offset of the PP strapping tape by setting a supply module, a packaging module and a control module. Due to the accumulation of dust and oil on the surface of the roller used to convey the strapping tape, the friction between the roller and the strapping tape increases, resulting in unsmooth supply of the strapping tape, which causes the position of the PP strapping tape to shift. By increasing the tension of the PP strapping tape, it is ensured that there is sufficient pressure between the strapping tape and the roller, and the probability of position shift is reduced. By adjusting the supply speed of the PP strapping tape according to the proportion of the number of successful strapping of the PP strapping tape, the clamping device in the strapping device is damaged due to long-term use. Wear and tear will cause the strapping tape to be unable to be firmly clamped, resulting in loose strapping tape, which will lead to a decrease in the success rate of strapping. By reducing the supply speed of the PP strapping tape, the clamping device has enough time to clamp the strapping tape. By adjusting the cutting pressure of the strapping tape cutter according to the average strapping time of the PP strapping tape, the nut that fixes the tool will loosen due to the long-term operation of the cutting device, causing the blade to tilt, resulting in uneven cutting force of the blade, which will increase the strapping time. By increasing the cutting pressure of the strapping tape cutter, the blade is more firmly fixed in the device, reducing the probability of the blade tilting and shaking, improving the cutting stability of the cutting device, and realizing the improvement of the operating stability of the automatic packaging device.

[0020] Furthermore, the device of the present invention adjusts the tension of the PP strapping tape by setting a preset first variance and a preset second variance. Since dust and oil accumulate on the surface of the roller used to convey the strapping tape, the friction between the roller and the strapping tape increases, resulting in unsmooth supply of the strapping tape, which causes the position of the PP strapping tape to shift. By increasing the tension of the PP strapping tape, sufficient pressure is ensured between the strapping tape and the roller, reducing the probability of position shift, thereby further improving the operating stability of the automatic packaging device.

[0021] Furthermore, the device described in the present invention adjusts the supply speed of the PP strapping tape by setting a preset first ratio and a preset second ratio. The clamping device in the strapping device is worn due to long-term use, resulting in the inability to firmly clamp the strapping tape, causing the strapping tape to loosen, thereby reducing the success rate of strapping. By reducing the supply speed of the PP strapping tape, the clamping device is allowed to have enough time to clamp the strapping tape, thereby further improving the operating stability of the automatic packaging device.

[0022] Furthermore, the device of the present invention adjusts the cutting pressure of the strapping tape cutter by setting a preset strapping time. Due to the long-term operation of the cutting device, the nut fixing the tool becomes loose, causing the blade to tilt, resulting in uneven cutting force of the blade, thereby increasing the strapping time. By increasing the cutting pressure of the strapping tape cutter, the blade is more firmly fixed in the device, reducing the probability of the blade tilting and shaking, improving the cutting stability of the cutting device, and further achieving the improvement of the operating stability of the automatic packaging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the automatic packaging device of the PP strapping tape according to the embodiment of the present invention;

[0024] Figure 2 It is a block diagram of the overall structure of the automatic packaging device of the PP strapping tape according to the embodiment of the present invention;

[0025] Figure 3 It is a logic flow chart of the automatic packaging device of PP strapping tape according to an embodiment of the present invention;

[0026] Figure 4 It is a specific structural block diagram of the supply module of the automatic packaging device of PP strapping tape according to the embodiment of the present invention;

[0027] The reference numerals are as follows: 1-workbench, 2-roller, 3-strap cutter, 4-tension controller, 5-gantry, 6-vision sensor, 7-roller, 8-strap reel, 9-supply motor, 10-drive motor, 11-roller motor. DETAILED DESCRIPTION

[0028] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0030] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall structural schematic diagram, an overall structural block diagram, a logic flow chart and a specific structural block diagram of a supply module of an automatic packaging device for PP strapping tape according to an embodiment of the present invention. An automatic packaging device for PP strapping tape according to the present invention comprises:

[0033] A supply module, used to transport the goods and the PP strapping tape to the packaging position respectively, including a conveying unit for conveying the goods and a supply unit for conveying the PP strapping tape, wherein the supply unit includes a supply motor 9 for providing conveying power for the PP strapping tape;

[0034] A packaging module, which is connected to the supply module and is used to package the goods, including a strapping unit arranged above the conveying unit for strapping the goods and a cutting unit arranged below the strapping unit for cutting the strapped PP strapping tape, wherein the cutting unit includes a strapping tape cutter 3 for cutting the PP strapping tape;

[0035] A control module is connected to the supply module and the packaging module respectively, and is used to adjust the tension of the PP strapping tape or adjust the supply speed of the PP strapping tape according to the proportion of successful strapping times of the PP strapping tape when it is determined that the operating stability of the automatic packaging device does not meet the requirements according to the variance of the offset of the PP strapping tape, and to adjust the cutting pressure of the strapping tape cutter 3 in combination with the proportion of successful strapping times of the PP strapping tape and the average strapping time of the PP strapping tape.

[0036] Specifically, the conveying unit includes:

[0037] Roller 2, used to limit the moving track of goods;

[0038] The drum motor 11 is connected to the drum 2 to provide rotational power for the drum 2 .

[0039] Specifically, the supply unit also includes:

[0040] A strapping tape reel 8, which is arranged below the drum 2 and is used to store the PP strapping tape;

[0041] The roller 7 is arranged above the strapping tape reel 8 and is used for conveying the PP strapping tape to the strapping position.

[0042] Specifically, the strapping unit includes:

[0043] A gantry 5 is arranged above the strapping tape cutter 3 to guide the PP strapping tape to wrap the goods;

[0044] A visual sensor 6, which is connected to the gantry 5, is used to detect the offset of the PP strapping tape after bundling;

[0045] A tension controller 4 is connected to the gantry 5 and is used to adjust the tension of the PP strapping tape.

[0046] Specifically, the cutting unit further includes a driving motor 10 connected to the strap cutter 3 for providing cutting power.

[0047] Specifically, an automatic packaging device for PP strapping tape also includes a workbench 1 for providing a packaging place.

[0048] Specifically, the cutting pressure of the strapping cutter 3 is adjusted by changing the rotation speed of the driving motor 10 .

[0049] In practice, the device of the present invention is provided with a supply module, a packaging module and a control module, and the tension of the PP strapping tape is adjusted according to the variance of the offset of the PP strapping tape. Due to the accumulation of dust and oil on the surface of the roller 7 for conveying the strapping tape, the friction between the roller 7 and the strapping tape increases, resulting in unsmooth supply of the strapping tape, which causes the position of the PP strapping tape to shift. By increasing the tension of the PP strapping tape, it is ensured that there is sufficient pressure between the strapping tape and the roller 7, and the probability of position shift is reduced. By adjusting the supply speed of the PP strapping tape according to the proportion of the number of successful strapping of the PP strapping tape, the clamping device in the strapping device is worn due to long-term use, resulting in failure to The method of firmly clamping the strapping tape causes the strapping tape to loosen, thereby reducing the success rate of strapping. By reducing the supply speed of the PP strapping tape, the clamping device has enough time to clamp the strapping tape. By adjusting the cutting pressure of the strapping tape cutter 3 according to the average strapping time of the PP strapping tape, the nut fixing the tool becomes loose due to the long-term operation of the cutting device, causing the blade to tilt, resulting in uneven cutting force of the blade, thereby increasing the strapping time. By increasing the cutting pressure of the strapping tape cutter 3, the blade is more firmly fixed in the device, reducing the probability of the blade tilting and shaking, improving the cutting stability of the cutting device, and achieving an improvement in the operating stability of the automatic packaging device.

[0050] Specifically, the control module is also used to calculate the variance of the offset of the PP strapping tape according to the obtained offsets of the several PP strapping tapes that have been strapped, and to determine that the operating stability of the automatic packaging device does not meet the requirements when the variance of the offset of the PP strapping tape meets the first variance condition or the second variance condition;

[0051] Among them, the first variance condition is that the variance of the offset of the PP strapping tape is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the offset of the PP strapping tape is greater than the preset second variance.

[0052] It can be understood that the three intervals corresponding to the preset first variance Q1 and the preset second variance Q2 correspond to three situations respectively. The first situation is Q≤Q1, and it is determined that the operating stability of the automatic packaging device meets the requirements; the second situation is Q1<Q≤Q2, and long-term use causes the clamping device in the strapping device to wear, resulting in the inability to firmly clamp the strapping tape, causing the strapping tape to loosen; the third situation is Q>Q2, and dust and oil accumulate on the surface of the roller 7 used to convey the strapping tape, resulting in increased friction between the roller 7 and the strapping tape, resulting in unsmooth supply of the strapping tape, which causes the position of the PP strapping tape to shift. In practice, Q1 is generally selected in the range of [2mm 2 , 4mm 2], Q2 is generally selected in the range of [4.5mm 2 , 5.5mm 2 ].

[0053] Preferably, the first variance Q1 is preset to be 3 mm. 2 , preset the second variance Q2=5mm 2 .

[0054] Specifically, the variance of the offset of the PP strapping tape is recorded as Q.

[0055] Specifically, the variance of the offset of the PP strapping tape is the variance of the offset of several completed PP strapping tapes. The calculation method of the variance of the offset of the PP strapping tape is a conventional technical means well known to those skilled in the art. Therefore, the calculation process of the variance of the offset of the PP strapping tape will not be repeated here.

[0056] In implementation, the device of the present invention determines the operating stability of the automatic packaging device by setting a preset first variance and a preset second variance, thereby reducing the impact of the reduced operating accuracy of the automatic packaging device due to inaccurate judgment of the operating stability of the automatic packaging device, and further improving the operating stability of the automatic packaging device.

[0057] Specifically, when the variance of the offset of the PP strapping tape only satisfies the first variance condition, the control module determines the packaging effectiveness of the PP strapping tape in combination with the proportion of successful strapping times of the PP strapping tape.

[0058] Specifically, the control module increases the tension of the PP strapping tape when the variance of the offset of the PP strapping tape only satisfies the second variance condition;

[0059] The increase range of the tension of the PP strapping tape is determined by the difference between the variance of the offset of the PP strapping tape and a preset second variance.

[0060] Specifically, the calculation formula for the increased tension of the PP strapping tape is:

[0061] ;

[0062] Among them, V' is the increased tension of the PP strapping tape, V is the current tension of the PP strapping tape, A is the minimum unit variance for adjusting the tension of the PP strapping tape, and v is the tension of the PP strapping tape when the variance of the offset of the PP strapping tape is the minimum unit variance.

[0063] In practice, the value of A is generally 4 mm. 2 ~6mm 2 , preferably, the preferred embodiment of A is 5mm 2.

[0064] In implementation, the optional range of the value of v is [70N, 90N]. Preferably, when the tension of the PP strapping tape is less than 80N, the position of the PP strapping tape may be offset. Therefore, the preferred embodiment of v is 80N.

[0065] For example, the goods are packed using an automatic packing device with PP packing tape, where V=60N, Q=7mm 2 , calculated .

[0066] In implementation, the device of the present invention adjusts the tension of the PP strapping tape by setting a preset first variance and a preset second variance. Since dust and oil accumulate on the surface of the roller 7 for conveying the strapping tape, the friction between the roller 7 and the strapping tape increases, resulting in unsmooth supply of the strapping tape, which causes the position of the PP strapping tape to shift. By increasing the tension of the PP strapping tape, sufficient pressure is ensured between the strapping tape and the roller 7, reducing the probability of position shift, and further achieving improved operating stability of the automatic packaging device.

[0067] Specifically, the control module is further used to calculate the proportion of successful PP strapping times according to the acquired number of successful PP strapping times and the total number of PP strapping times, and, when the proportion of successful PP strapping times satisfies the first proportion condition or the second proportion condition, determine that the packaging effectiveness of the PP strapping does not meet the requirements;

[0068] Among them, the first proportion condition is that the proportion of successful times of PP strapping is greater than the preset first proportion and less than or equal to the preset second proportion; the second proportion condition is that the proportion of successful times of PP strapping is greater than the preset second proportion.

[0069] It can be understood that the three intervals corresponding to the preset first proportion P1 and the preset second proportion P2 correspond to three situations respectively. The first situation is P≤P1, and it is determined that the packaging effectiveness of the PP strapping tape meets the requirements; the second situation is P1<P≤P2, and long-term use causes the clamping device in the strapping device to wear, resulting in the inability to firmly clamp the strapping tape, causing the strapping tape to loosen; the third situation is P>P2, and the long-term operation of the cutting device causes the nut that fixes the tool to loosen, causing the blade to tilt, resulting in uneven cutting force of the blade, and thus increasing the packaging time. In practice, the range of P1 is generally [0.65, 0.75], and the range of P2 is generally [0.8, 0.9].

[0070] Preferably, the first proportion P1 is preset to be 0.7, and the second proportion P2 is preset to be 0.85.

[0071] Specifically, the percentage of successful PP strapping is recorded as P.

[0072] In implementation, the device of the present invention determines the packaging effectiveness of the PP strapping tape by setting a preset first ratio and a preset second ratio, thereby reducing the impact of the reduced operating stability of the automatic packaging device due to inaccurate judgment of the packaging effectiveness of the PP strapping tape, and further improving the operating stability of the automatic packaging device.

[0073] Specifically, the proportion of successful PP strapping times is the ratio of successful PP strapping times to the total number of PP strapping times.

[0074] Specifically, when the proportion of successful strapping times of the PP strapping tape only meets the second proportion condition, the control module determines the operation stability of the cutting unit in combination with the average strapping time of the PP strapping tape.

[0075] Specifically, the control module reduces the supply speed of the PP strapping tape when the proportion of the number of successful strapping of the PP strapping tape only meets the first proportion condition;

[0076] The reduction range of the supply speed of the PP strapping tape is determined by the difference between the proportion of successful strapping times of the PP strapping tape and a preset first proportion.

[0077] Specifically, the calculation formula for the reduced supply speed of the PP strapping tape is:

[0078] ;

[0079] Among them, H' is the reduced supply speed of the pp strapping tape, H is the current supply speed of the pp strapping tape, B is the minimum unit proportion for adjusting the supply speed of the pp strapping tape, and h is the supply speed of the pp strapping tape when the number of successful pp strapping tape bundling times accounts for the minimum unit proportion.

[0080] In practice, the value of B is generally 0.45 to 0.55, and preferably, the preferred embodiment of B is 0.5.

[0081] In implementation, the optional range of h is [2m / min, 4m / min]. Preferably, when the supply speed of the PP strapping tape is greater than 3m / min, the PP strapping tape may become loose. Therefore, the preferred embodiment of h is 3m / min.

[0082] For example, when using an automatic packaging device with PP strapping tape to pack goods, where H=4m / min, P=0.9, we can calculate .

[0083] In implementation, the device of the present invention adjusts the supply speed of the PP strapping tape by setting a preset first ratio and a preset second ratio. The clamping device in the strapping device is worn due to long-term use, resulting in the inability to firmly clamp the strapping tape, causing the strapping tape to loosen, thereby reducing the success rate of strapping. By reducing the supply speed of the PP strapping tape, the clamping device is allowed to have enough time to clamp the strapping tape, thereby further improving the operating stability of the automatic packaging device.

[0084] Specifically, the control module is also used to calculate the average packing time of the PP packing tape according to the obtained packing time of the PP packing tape during several packing times, and when the average packing time of the PP packing tape is greater than the preset packing time, determine that the operating stability of the cutting unit does not meet the requirements, and increase the cutting pressure of the packing tape cutter 3.

[0085] It can be understood that the two intervals corresponding to the preset packaging time Y0 correspond to two situations. The first situation is Y≤Y0, which determines that the operation stability of the cutting unit meets the requirements; the second situation is Y>Y0, and the long-term operation of the cutting device causes the nut that fixes the tool to loosen, causing the blade to tilt, resulting in uneven cutting force of the blade, which leads to an increase in the packaging time. In practice, Y0 is generally selected in the range of [0.5s, 0.7s].

[0086] Preferably, the preset packaging time Y0=0.6s.

[0087] Specifically, the average packaging time of PP strapping tape is recorded as Y.

[0088] Specifically, the calculation formula for the average packaging time of PP strapping tape is:

[0089] ;

[0090] Among them, Y is the average packaging time of PP strapping tape, X a is the packing time of the PP packing belt during the a-th packing, n is the number of packing times, and n is a natural number greater than or equal to 1.

[0091] In implementation, the device of the present invention determines the operating stability of the cutting unit by setting a preset packaging time, thereby reducing the impact of the reduced operating stability of the automatic packaging device due to inaccurate judgment of the operating stability of the cutting unit, and further improving the operating stability of the automatic packaging device.

[0092] Specifically, the increase range of the cutting pressure of the strapping tape cutter 3 is determined by the difference between the average strapping time of the PP strapping tape and the preset strapping time.

[0093] Specifically, the calculation formula of the increased cutting pressure of the strapping cutter 3 is:

[0094] ;

[0095] Among them, L' is the increased cutting pressure of the strapping tape cutter 3, L is the current cutting pressure of the strapping tape cutter 3, C is the minimum unit packaging time for adjusting the cutting pressure of the strapping tape cutter 3, and l is the cutting pressure of the strapping tape cutter 3 when the average packaging time of the PP strapping tape is the minimum unit packaging time.

[0096] In practice, the value of C is generally 0.7s to 0.9s. Preferably, the preferred embodiment of C is 0.8s.

[0097] In practice, the optional range of l is [60N, 80N]. Preferably, when the cutting pressure of the strapping cutter 3 is less than 70N, it may cause uneven cutting force of the blade. Therefore, the preferred embodiment of l is 70N.

[0098] For example, when using an automatic packaging device with PP strapping tape to pack goods, L=60N, Y=0.8s, the calculation result is .

[0099] In practice, the device of the present invention adjusts the cutting pressure of the strapping tape cutter 3 by setting a preset strapping time. Due to the long-term operation of the cutting device, the nut fixing the tool becomes loose, causing the blade to tilt, resulting in uneven cutting force of the blade, thereby increasing the strapping time. By increasing the cutting pressure of the strapping tape cutter 3, the blade is more firmly fixed in the device, reducing the probability of the blade tilting and shaking, improving the cutting stability of the cutting device, and further achieving the improvement of the operating stability of the automatic packaging device.

[0100] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An automatic packaging device for PP strapping, characterized in that: include: A supply module, used to transport the goods and the PP strapping tape to the packaging position respectively, comprising a conveying unit for conveying the goods and a supply unit for conveying the PP strapping tape, wherein the supply unit comprises a supply motor for providing conveying power for the PP strapping tape; A packaging module, which is connected to the supply module and is used to package the goods, comprising a strapping unit arranged above the conveying unit for strapping the goods and a cutting unit arranged below the strapping unit for cutting the strapped PP strapping tape, wherein the cutting unit comprises a strapping tape cutter for cutting the PP strapping tape; A control module, which is connected to the supply module and the packaging module respectively, and is used to adjust the tension of the PP strapping tape or adjust the supply speed of the PP strapping tape according to the proportion of successful strapping times of the PP strapping tape when judging that the running stability of the automatic packaging device does not meet the requirements according to the variance of the offset of the PP strapping tape, and adjust the cutting pressure of the strapping tape cutter in combination with the proportion of successful strapping times of the PP strapping tape and the average strapping time of the PP strapping tape; The control module is also used to calculate the variance of the offset of the PP strapping tape according to the obtained offsets of the several PP strapping tapes that have been strapped, and to determine that the operation stability of the automatic packaging device does not meet the requirements when the variance of the offset of the PP strapping tape meets the first variance condition or the second variance condition; Wherein, the first variance condition is that the variance of the offset of the PP strapping tape is greater than the preset first variance and less than or equal to the preset second variance; the second variance condition is that the variance of the offset of the PP strapping tape is greater than the preset second variance; The control module determines the packaging effectiveness of the PP strapping tape in combination with the proportion of successful strapping times of the PP strapping tape when the variance of the offset of the PP strapping tape only satisfies the first variance condition; The control module is also used to calculate the proportion of successful PP strapping times according to the acquired number of successful PP strapping times and the total number of PP strapping times, and to determine that the packaging effectiveness of the PP strapping does not meet the requirements when the proportion of successful PP strapping times meets the first proportion condition or the second proportion condition; Among them, the first proportion condition is that the proportion of the number of successful PP strapping is greater than the preset first proportion and less than or equal to the preset second proportion; the second proportion condition is that the proportion of the number of successful PP strapping is greater than the preset second proportion; The control module determines the operation stability of the cutting unit in combination with the average packaging time of the PP strapping tape when the proportion of the number of successful strapping of the PP strapping tape only meets the second proportion condition; The control module is also used to calculate the average packing time of the PP packing tape according to the obtained packing time of the PP packing tape during several packing times, and when the average packing time of the PP packing tape is greater than the preset packing time, determine that the operating stability of the cutting unit does not meet the requirements, and increase the cutting pressure of the packing tape cutter.

2. The automatic packaging device for PP strapping tape according to claim 1 is characterized in that: The control module increases the tension of the PP strapping tape when the variance of the offset of the PP strapping tape only satisfies the second variance condition; The increase range of the tension of the PP strapping tape is determined by the difference between the variance of the offset of the PP strapping tape and a preset second variance.

3. The automatic packaging device for PP strapping tape according to claim 2 is characterized in that: The proportion of successful PP strapping times is the ratio of successful PP strapping times to the total number of PP strapping times.

4. The automatic packaging device for PP strapping tape according to claim 3 is characterized in that: The control module reduces the supply speed of the PP strapping tape when the proportion of the number of successful strapping of the PP strapping tape only meets the first proportion condition; The reduction range of the supply speed of the PP strapping tape is determined by the difference between the proportion of successful strapping times of the PP strapping tape and a preset first proportion.

5. The automatic packaging device for PP strapping tape according to claim 4 is characterized in that: The increase range of the cutting pressure of the strapping tape cutter is determined by the difference between the average strapping time of the PP strapping tape and the preset strapping time.

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