Belt-type variable diameter round baler and control method thereof

Abstract

The application discloses a belt type variable-diameter round baler and a control method thereof, and belongs to the technical field of round balers, and solves the problem that existing balers cannot meet the forming requirements of round straw bales with different diameters; the belt type variable-diameter round baler comprises a moving frame, a picking mechanism, a feeding mechanism, a pressing chamber and a belt type baling mechanism in the pressing chamber. The main body of the round baler advances on the ground through the moving frame, and the scattered straw on the ground is sent into the feeding mechanism through the picking mechanism; the feeding mechanism sends the straw into the pressing chamber; the straw is compressed by the straw compression port of the annular belt in the pressing chamber to form a round bale; the size of the straw compression port of the annular belt is adjusted through the tension adjusting structure to adjust the diameter of the straw bale; the annular belt is always pressed against the straw bale, and the adjustment is made according to different types of straw and required diameters of the straw bale, so that the applicability and flexibility of the existing baler are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of round baler, in particular to a belt type variable-diameter round baler and a control method thereof. BACKGROUND

[0002] The baler is an important equipment in modern agricultural production, which can pick up and bundle crop straw such as rice straw, wheat straw, corn stalk, rape stalk and pasture.

[0003] The existing baler has the following disadvantages: the square baler is provided with a knotter, which is complex to operate and maintain, and the machine type has a large volume.

[0004] The compression chamber of the round baler forms a single-diameter round bale, which cannot meet the forming needs of round bales of different diameters. For example, the self-propelled baler disclosed in the Chinese Utility Model Patent No. 202020819594.X includes a self-propelled chassis, a pick-up cutting table, a feeding device, a crushing device, a throwing device and a bundling device, which can realize self-propelled continuous harvesting and bundling without stopping, but the baler forms a single-diameter bale, which cannot form round bales of different diameters in one machine. SUMMARY

[0005] In view of the above problems in the prior art, the present application provides a belt type variable-diameter round baler and a control method thereof, which solves the problem that the existing baler cannot meet the forming needs of round bales of different diameters.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] On the one hand, a belt type variable-diameter round baler is provided, which includes a round baler body, the round baler body including a movable frame, a compression chamber being provided on the movable frame, a feeding mechanism being provided at the bottom inlet of the compression chamber and fixed to the movable frame, a picking mechanism being provided at the inlet of the feeding mechanism for picking up straw, a net feeding mechanism being provided above the feeding mechanism on the compression chamber for winding net around the straw bale; a belt bundling mechanism is provided inside the compression chamber, the belt bundling mechanism including a driving round roller and a plurality of driven round rollers which are rotatably provided in the compression chamber, an annular belt being provided on the driving round roller and the plurality of driven round rollers, a compressed straw port being provided on the annular belt for compressing the straw to form a round bale, a tension adjusting structure being provided on the annular belt for adjusting the size of the compressed straw port, and at least one forming round roller being rotatably provided on the compression chamber at the compressed straw port for forming the straw bale.

[0008] The working principle of the present scheme is that the round baler body advances on the ground through the moving frame, the scattered straw on the ground enters the feeding mechanism through the pickup mechanism, the feeding mechanism sends the straw into the baling chamber, the compression straw port of the annular belt in the baling chamber compresses the straw to form a round bale, and the size of the compression straw port of the annular belt is adjusted through the tensioning and adjusting structure to adjust the diameter of the straw bale, which not only makes the annular belt always compress the straw bale, but also adjusts according to different types of straw and required bale diameter, thereby improving the applicability and flexibility of the existing baler.

[0009] Further, the baling chamber includes a front baling chamber and a rear baling chamber that are hingedly connected at the top, the feeding mechanism is arranged at the bottom inlet of the front baling chamber, and the feeding mechanism includes a forced feeding knife rotatably arranged on the moving frame, and two auxiliary feeding circular rollers rotatably arranged on the moving frame below the forced feeding knife. The combination of the forced feeding knife and the auxiliary feeding circular rollers improves the feeding speed and efficiency and reduces the risk of blockage. The front baling chamber and the rear baling chamber are connected by hingedly connecting at the top, which facilitates opening the rear baling chamber to discharge the straw bale.

[0010] Further, two forming circular rollers are rotatably arranged on the front baling chamber at the compression straw port, the two forming circular rollers are a first forming circular roller and a second forming circular roller, the second forming circular roller is located obliquely above the first forming circular roller, and a plurality of ribs are uniformly fixed on the second forming circular roller. The cooperation of the first forming circular roller and the second forming circular roller helps to form a more compact and stable bale structure. The plurality of ribs on the second forming circular roller can further compress the straw bale.

[0011] Further, one end of the second forming circular roller is connected with a driving circular roller chain transmission, the other end of the second forming circular roller is connected with one end of the first forming circular roller through chain transmission, the other end of the first forming circular roller is connected with an output shaft of a gear box through chain transmission, and the gear box is fixed on the front baling chamber. The chain transmission ensures the stability and reliability in the process of power transmission, and reduces energy loss

[0012] Further, the tensioning and adjusting structure includes two belt tensioning arms, one end of each of the two belt tensioning arms is hingedly connected to the inner top of the front baling chamber, a plurality of tensioning rollers in contact with the annular belt are rotatably arranged between the two belt tensioning arms, the middle part of each belt tensioning arm is hingedly connected with the extension end of a hydraulic rod, and the fixed end of each hydraulic rod is hingedly connected to the front baling chamber; the two belt tensioning arms are lifted upward during the increase of the straw bale and drive the extension of the extension end of the two hydraulic rods.

[0013] Further, a limiting arm for limiting the two sides of the straw bale is arranged on each side of the front baling chamber, and the two limiting arms are located at the junction of the fixed ends of the two hydraulic rods. The design of the limiting arm can effectively prevent the straw bale from deviating during compression, ensuring the consistency and stability of the bale formation.

[0014] Further, a first pressure sensor is arranged on each limiting arm, each first pressure sensor is electrically connected with a controller in the round baler body, and the controller is electrically connected with an alarm. The two first pressure sensors can monitor the pressure distribution on both sides of the straw round bale in real time, and the pressure values of the two first pressure sensors facilitate the judgment of whether the density on both sides of the straw round bale is uniform. If the pressure values of the two first pressure sensors differ too much, the alarm will be started to remind the driver to change the route, so that the density on both sides of the straw bale is kept as uniform as possible.

[0015] Further, an angle sensor is arranged at the hinged joint of each belt tensioning arm and the front pressing chamber, a displacement sensor for measuring the extension amount of the telescopic end and a second pressure sensor for measuring the pressure of the telescopic end are arranged on the hydraulic rod, and the angle sensor, the displacement sensor and the second pressure sensor are electrically connected with the controller. The angle sensor can detect the angle of the lifting of the belt tensioning arm, facilitating the conversion of the diameter and pressure of the straw bale. The displacement sensor and the second pressure sensor can detect the extension amount and the force of the hydraulic rod, facilitating the control of the angle of the lifting of the belt tensioning arm.

[0016] On the other hand, a control method of a belt type variable diameter round baler is provided, comprising the steps of:

[0017] S1, setting the baling pressure, baling diameter and net winding number of the straw bale;

[0018] S2, starting the belt type variable diameter round baler to perform the straw baling operation;

[0019] S3, controlling the extension of the telescopic end of the two hydraulic rods to drive the belt tensioning arm to rise and expand the compressed straw port on the annular belt;

[0020] Wherein, the extension amount of the hydraulic rod k1 is a proportional constant, L1 is the distance from the support end of the belt tensioning arm to the hinged joint of the belt tensioning arm and the front pressing chamber, L2 is the distance from the hinged joint of the belt tensioning arm and the hydraulic rod to the hinged joint of the belt tensioning arm and the front pressing chamber; L3 is the distance from the hinged joint of the front pressing chamber and the fixed end of the hydraulic rod to the hinged joint of the belt tensioning arm and the front pressing chamber; β is the initial included angle between the connecting line and the belt tensioning arm, the connecting line is the straight line between the telescopic end of the hydraulic rod and the hinged joint of the front pressing chamber and the hinged joint of the belt tensioning arm and the front pressing chamber; θ is the angle change amount of the belt tensioning arm; P ′ is the pressure on the telescopic end of the hydraulic rod, P is the baling pressure corresponding to the diameter of the straw bale; L Y is the initial length of the hydraulic rod;

[0021] S4, judge whether the diameter of the straw bale is greater than or equal to a set value, if yes, go to step S5, otherwise continue the work; wherein the diameter of the straw bale

[0022] S5, stop the forward movement of the belt type variable diameter round baler, and discharge the straw bale from the baling chamber after the straw bale is wrapped by the net feeding mechanism;

[0023] S6, repeat steps S2 to S5 until the belt type variable diameter round baler completes the whole straw baling work.

[0024] Further, during the straw baling work of the variable diameter round baler, if the difference between the two pressure values detected by the first pressure sensor on the two limiting arms exceeds 10%, the controller will start the alarm to alarm.

[0025] The present application discloses a belt type variable diameter round baler and a control method thereof, which has the beneficial effects that:

[0026] The main body of the round baler advances on the ground through the moving frame, and the scattered straw on the ground is fed into the feeding mechanism through the pickup mechanism, the straw is fed into the baling chamber by the feeding mechanism, and the compressed straw port of the annular belt in the baling chamber compresses the straw to form a round bale, and the diameter of the straw bale is adjusted by adjusting the size of the compressed straw port of the annular belt through the tensioning and adjusting structure, which not only makes the annular belt always compress the straw bale, but also adjusts according to different types of straw and required bale diameter, thereby improving the applicability and flexibility of the existing baler. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the belt type variable diameter round baler;

[0028] Figure 2 It is a side view of the front baling chamber;

[0029] Figure 3 It is a side view of the rear baling chamber;

[0030] Figure 4 It is a side view of the feeding mechanism;

[0031] Figure 5 It is a front view of the feeding mechanism;

[0032] Figure 6 It is a structural schematic view of the auxiliary feeding roller;

[0033] Figure 7 It is a structural schematic view of the belt baling mechanism;

[0034] Figure 8 It is a structural schematic view of the belt baling mechanism;

[0035] Figure 9 is a structural schematic diagram of a belt tensioning arm;

[0036] Figure 10 is a structural schematic diagram of a driving round roller;

[0037] Figure 11 is a structural schematic diagram of a second forming round roller;

[0038] Figure 12 is a structural schematic diagram of a second forming round roller;

[0039] Wherein: 1, moving frame; 2, picking mechanism; 3, feeding mechanism; 31, forced feeding knife; 32, auxiliary feeding round roller; 4, net conveying mechanism; 5, baling chamber; 51, front baling chamber; 52, rear baling chamber; 6, belt baling mechanism; 61, driving round roller; 62, driven round roller; 621, first driven round roller; 622, second driven round roller; 623, third driven round roller; 63, forming round roller; 631, first forming round roller; 632, second forming round roller; 64, belt tensioning arm; 641, first tensioning roller; 642, second tensioning roller; 643, third tensioning roller; 65, hydraulic rod; 66, limiting arm; 7, gear box. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application are described below to facilitate the understanding of the present application for those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, it is obvious that various changes are within the spirit and scope of the present application defined and determined by the appended claims, and all the inventions utilizing the concept of the present application are within the scope of protection.

[0041] Embodiment 1

[0042] The present embodiment provides a belt type variable diameter round baler to solve the problem that the existing baler cannot meet the forming requirements of round straw bales of different diameters.

[0043] Reference Figure 1 A belt type variable diameter round baler, comprising a round baler body, the round baler body comprising a moving frame 1, the moving frame 1, a picking mechanism 2, a feeding mechanism 3, a net conveying mechanism 4, a baling chamber 5 and a belt baling mechanism 6 in the baling chamber 5.

[0044] The moving frame 1 is used to drive the round baler body to move.

[0045] The baling chamber 5 is fixed on the moving frame 1. Referring to Figure 2 and Figure 3The compression chamber 5 comprises a front compression chamber 51 and a rear compression chamber 52 which are hingedly connected at the top, and the rear compression chamber 52 is opened to discharge the straw bale.

[0046] The feeding mechanism 3 is arranged at the bottom inlet of the compression chamber 5. Figures 4 to 6 The feeding mechanism 3 comprises a forced feeding knife 31 which is rotatably arranged on the moving frame 1, and two auxiliary feeding rollers 32 which are rotatably arranged on the moving frame 1 below the forced feeding knife 31. The combination of the forced feeding knife 31 and the auxiliary feeding rollers 32 improves the feeding speed and efficiency and reduces the risk of blockage.

[0047] The pickup mechanism 2 is arranged at the inlet of the feeding mechanism 3 for picking up the straw. The pickup mechanism 2 of the present embodiment is a prior art, and can adopt the pickup mechanism in the circular bale baler disclosed in CN112243706A. Since it is a prior art, the specific working principle and connection relationship thereof will not be described in detail.

[0048] The net conveying mechanism 4 is arranged above the feeding mechanism 3 on the compression chamber 5, and is used for netting the straw bale. The net conveying mechanism of the present embodiment can adopt the net conveying and cutting mechanism in the circular bale baler net conveying and cutting mechanism and its use method disclosed in CN115399148B. Since it is a prior art, the specific working principle and connection relationship thereof will not be described in detail.

[0049] The belt baling mechanism 6 is arranged inside the compression chamber 5, and is used for compressing the straw to form a circular bale. Referring to Figures 7 to 10 The belt baling mechanism 6 comprises a driving roller 61 and a plurality of driven rollers 62 which are rotatably arranged in the compression chamber 5, and an annular belt is sleeved on the driving roller 61 and the plurality of driven rollers 62. The annular belt is provided with a straw compression port for compressing the straw to form a circular bale, and is provided with a tension adjusting structure for adjusting the size of the straw compression port. At least one forming roller 63 for forming a straw bale is rotatably arranged on the compression chamber 5 at the straw compression port.

[0050] In the present embodiment, referring to Figure 11 and Figure 12 Two forming rollers 63 are rotatably arranged on the front compression chamber 51 at the straw compression port, and the two forming rollers 63 are respectively a first forming roller 631 and a second forming roller 632. The second forming roller 632 is located obliquely above the first forming roller 631, and a plurality of ribs are uniformly fixed on the second forming roller 632. The cooperation of the first forming roller 631 and the second forming roller 632 helps to form a more compact and stable bale structure. The plurality of ribs on the second forming roller 632 can further compress the straw bale.

[0051] As the transmission scheme of the present embodiment, one end of the second forming roller 632 is connected with the driving roller 61 by chain transmission, the other end of the second forming roller 632 is connected with one end of the first forming roller 631 by chain transmission, the other end of the first forming roller 631 is connected with the output shaft of the gear box 7 by chain transmission, and the output shaft of the gear box 7 is connected with the feeding mechanism 3 by chain transmission. The gear box 7 is fixed on the front pressing chamber 51. The chain transmission ensures the stability and reliability in the process of power transmission, and reduces the energy loss.

[0052] As a specific scheme of the tension adjusting structure, referring to Figure 7 , the tension adjusting structure includes two belt tensioning arms 64, one end of each of the two belt tensioning arms 64 is hingedly connected to the inner top of the front pressing chamber 51 on both sides, a plurality of tensioning rollers in contact with the annular belt are rotationally arranged between the two belt tensioning arms 64, the middle part of each belt tensioning arm 64 is hingedly connected with the extension end of a hydraulic rod 65, and the fixed end of each hydraulic rod 65 is hingedly connected to the front pressing chamber 51; during the increase of the straw bale, the two belt tensioning arms 64 are lifted upward and drive the extension of the extension end of the two hydraulic rods 65, and the pressure of the hydraulic rod is maintained to ensure that the straw bale is formed under a certain pressure.

[0053] Specifically, in the present embodiment, the three driven rollers 62 at the straw compression port in the belt bundling mechanism 6 are respectively a first driven roller 621, a second driven roller 622 and a third driven roller 623, wherein the first driven roller 621 is located below the driving roller 61, the second driven roller 622 is located beside the driving roller 61, and the third driven roller 623 is located below the second driven roller 622, and the belt tensioning arm 64 is provided with a first tensioning roller 641, a second tensioning roller 642 and a third tensioning roller 643, the first tensioning roller 641 is located on one side below the driving roller 61, and the second tensioning roller 642 and the third tensioning roller 643 are respectively located on both sides below the second driven roller 622. Part of the annular belt passes through the first tensioning roller 641, the driving roller 61, the first driven roller 621, the second tensioning roller 642, the second driven roller 622, the third tensioning roller 643 and the third driven roller 623 in turn. Among them, the first driven roller 621, the second tensioning roller 642, the second tensioning roller 642 and the third driven roller 623 form a triangular opening-shaped straw compression port, and the straw compression port compresses the straw bale below the two forming rollers 63.

[0054] Specifically, the front pressing chamber 51 is provided with a limiting arm 66 for limiting the two sides of the straw bale on both sides thereof, and the two limiting arms 66 are respectively located at the junction of the fixed ends of the two hydraulic rods 65. The design of the limiting arm 66 can effectively prevent the straw bale from deviating during compression, and ensure the consistency and stability of the straw bale forming.

[0055] As a further scheme of the embodiment, a first pressure sensor is arranged on each limiting arm 66, each first pressure sensor is electrically connected with a controller in the round baler body, and the controller is electrically connected with an alarm. The two first pressure sensors can monitor the pressure distribution on both sides of the straw round bale in real time, and the pressure values of the two first pressure sensors facilitate the judgment of whether the density on both sides of the straw round bale is uniform. If the pressure values of the two first pressure sensors differ too much, the alarm will be started to remind the driver to change the route, so that the density on both sides of the straw bale is kept as uniform as possible.

[0056] An angle sensor is arranged at the hinged position of each belt tensioning arm 64 and the front pressing chamber 51. The angle sensor can detect the angle of the lifting of the belt tensioning arm 64, and facilitate the conversion of the diameter and pressure of the straw bale.

[0057] A displacement sensor for measuring the extension amount of the telescopic end and a second pressure sensor for measuring the pressure of the telescopic end are arranged on the hydraulic rod 65. The angle sensor, the displacement sensor and the second pressure sensor are electrically connected with the controller. The displacement sensor and the second pressure sensor can detect the extension amount and the force of the hydraulic rod 65, and facilitate the control of the angle of the lifting of the belt tensioning arm 64. The controller of the embodiment is preferably a PLC.

[0058] In summary, the working principle of the scheme is that,

[0059] The round baler body advances on the ground through the moving frame 1. The scattered straw on the ground enters the feeding mechanism 3 through the pickup mechanism 2. The feeding mechanism 3 sends the straw into the pressing chamber 5. The compressed straw port of the annular belt in the pressing chamber 5 compresses the straw to form a round bale. The size of the compressed straw port of the annular belt is adjusted by the tensioning and adjusting structure to adjust the diameter of the straw bale. Not only does this make the annular belt always compress the straw bale, but also it adjusts according to different types of straw and the required diameter of the bale, thereby improving the applicability and flexibility of the existing baler.

[0060] Embodiment 2

[0061] This embodiment is a further limitation based on embodiment 1. The specific improvement point is how to control the belt type variable diameter round baler to carry out straw baling operation. The other parts not mentioned refer to embodiment 1 or the prior art.

[0062] The embodiment provides a control method of a belt type variable diameter round baler, which comprises the following steps:

[0063] S1, setting the baling pressure, baling diameter and net winding number of the straw bale.

[0064] S2, starting the belt type variable diameter round baler to carry out straw baling operation.

[0065] S3, control the extension of the telescopic end of the two hydraulic rods 65 to drive the belt tensioning arm 64 to rise, and expand the compressed straw port on the annular belt.

[0066] Specifically, referring to Figure 8 Because Therefore, the extension amount of the hydraulic rod 65

[0067] Wherein, k1 is a proportional constant, L1 is the distance from the support end of the belt tensioning arm 64 to the annular belt to the hinge between the belt tensioning arm 64 and the front pressing chamber 511, L2 is the distance from the hinge between the belt tensioning arm 64 and the hydraulic rod 65 to the hinge between the belt tensioning arm 64 and the front pressing chamber, L3 is the distance from the hinge between the fixed end of the hydraulic rod and the front pressing chamber to the hinge between the belt tensioning arm 64 and the front pressing chamber 511; β is the initial angle between the line and the belt tensioning arm 64, the line is the straight line between the hinge between the telescopic end of the hydraulic rod 65 and the front pressing chamber 511 to the hinge between the belt tensioning arm 64 and the front pressing chamber 511; θ is the angle change amount of the belt tensioning arm 64; P ′ P is the pressure on the telescopic end of the hydraulic rod, P is the corresponding baling pressure of the diameter of the straw bale, the larger the diameter of the straw bale, the greater the required baling pressure; L Y is the initial length of the hydraulic rod 65. a is the angle between the hydraulic rod 65 and the belt tensioning arm 64.

[0068] In this embodiment, the extension amount of the hydraulic rod is controlled by the displacement sensor, which can ensure that the corresponding baling pressure is maintained during the increase of the diameter of the straw bale. If the internal pressure is insufficient during the increase of the straw bale, the straw bale may not be tight enough, which may cause deformation or dispersion during transportation or storage; if the internal pressure of the straw bale is too high, especially for brittle straw, it may cause the straw to break, reducing the overall quality of the bale. At the same time, for the bale used as feed, the internal pressure may be too high, which may make the straw too tight, affecting the chewing and digestion of livestock. The angle sensor is provided to monitor the angle change amount of the belt tensioning arm 64 and thus to calculate the extension amount of the hydraulic rod 65.

[0069] S4, judge whether the diameter of the straw bale is greater than or equal to the set value, if yes, enter step S5, otherwise continue the work.

[0070] Wherein, referring to Figure 8 , the diameter of the straw bale 0.6 indicates that when the diameter of the straw bale is greater than 0.6m, the annular belt is gradually expanded, and the belt tensioning arm 64 starts to work. By calculating the diameter of the straw bale, compared with directly using the distance sensor, the straw is avoided to be touched, so that the controller can more accurately obtain the diameter of the straw bale.

[0071] S5. Stop the belt-driven variable diameter round baler from moving forward, and after the straw bales are wrapped with netting by the netting mechanism 4, discharge the straw bales from the baling chamber 5.

[0072] S6. Repeat steps S2 to S5 until the belt-driven variable diameter round baler completes all straw baling operations.

[0073] If one side of the straw bale has a lower density, that side may be weaker due to insufficient compression and is more prone to deformation or breakage under external force. To avoid this, in this embodiment, the variable diameter round baler will activate an alarm if the two pressure values ​​detected by the first pressure sensor on the two limit arms 66 differ by more than 10% during straw baling operations. This alarm will remind the driver to change the travel route to keep the density of the straw bale as uniform as possible on both sides.

[0074] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A belt-driven variable-diameter round strapping machine, characterized in that, The baler includes a main body, which includes a mobile frame (1) and a baling chamber (5) on the mobile frame (1). The baling chamber (5) includes a front baling chamber (51) and a rear baling chamber (52) that are hinged together at the top. A feeding mechanism (3) fixed on the mobile frame (1) is provided at the bottom entrance of the baling chamber (5). A picking mechanism (2) for picking up straw is provided at the feeding point of the feeding mechanism (3). A net feeding mechanism (4) for wrapping straw bales is provided on the baling chamber (5) above the feeding mechanism (3). The baling chamber (5) is equipped with a belt baling mechanism (6). The belt baling mechanism (6) includes a drive roller (61) and multiple driven rollers (62) rotatably arranged in the baling chamber (5). The drive roller (61) and multiple driven rollers (62) are equipped with an annular belt. The annular belt is equipped with a compression straw opening for compressing straw into a round bale. The annular belt is equipped with a tension adjustment structure for adjusting the size of the compression straw opening. At least one forming roller (63) for forming straw bales is rotatably arranged at the compression straw opening in the baling chamber (5). The tension adjustment structure includes two belt tensioning arms (64), one end of each belt tensioning arm (64) is respectively hinged to the inner top sides of the front pressure binding chamber (51), and multiple tensioning rollers that rotatably contact the annular belt are arranged between the two belt tensioning arms (64). The middle part of each belt tensioning arm (64) is hinged to the telescopic end of a hydraulic rod (65), and the fixed end of each hydraulic rod (65) is hinged to the front pressure binding chamber (51). The two belt tensioning arms (64) lift upwards during the process of increasing the size of the straw bale, and drive the telescopic ends of the two hydraulic rods (65) to extend; Both sides of the front pressure bundling chamber (51) are provided with limiting arms (66) for limiting the two sides of the straw bale. The two limiting arms (66) are located at the junction of the fixed ends of the two hydraulic rods (65). Each limit arm (66) is equipped with a first pressure sensor, and each first pressure sensor is electrically connected to the controller in the main body of the round baler. The controller is electrically connected to the alarm. An angle sensor is provided at the hinge of each belt tensioning arm (64) and the front pressure chamber (51). A displacement sensor for measuring the elongation of the telescopic end and a second pressure sensor for measuring the pressure of the telescopic end are provided on the hydraulic rod (65). The angle sensor, the displacement sensor and the second pressure sensor are all electrically connected to the controller. The control method for the belt-type variable diameter round strapper includes the following steps: S1. Set the bundling pressure, bundling diameter, and number of wrapping loops for straw bales; S2. Start the belt-driven variable diameter round baler to perform straw baling operations; S3. Control the extension of the telescopic ends of the two hydraulic rods (65) to drive the belt tensioning arm (64) to rise, thereby expanding the compression straw opening on the annular belt; Among them, the elongation of the hydraulic rod (65) , It is a proportionality constant. The distance from the end of the supporting annular belt on the belt tensioning arm (64) to the hinge point between the belt tensioning arm (64) and the front pressure chamber (51) is denoted as . The distance from the hinge point between the belt tensioning arm (64) and the hydraulic rod (65) to the hinge point between the belt tensioning arm (64) and the front pressure chamber; The distance from the hinge point between the fixed end of the hydraulic rod (65) and the front pressure chamber (51) to the hinge point between the belt tensioning arm (64) and the front pressure chamber (51); The initial angle between the connecting line and the belt tensioning arm (64) is the straight line between the hinge point of the extension end of the hydraulic rod (65) and the front pressure chamber (51) and the hinge point of the belt tensioning arm (64) and the front pressure chamber (51). The change in angle of the belt tensioning arm (64); The pressure on the telescopic end of the hydraulic rod. The bundling pressure corresponding to the diameter of the straw bale; The initial length of the hydraulic rod (65); S4. Determine if the diameter of the straw bale is greater than or equal to a set value. If yes, proceed to step S5; otherwise, continue the operation. The straw bale diameter... ; S5. Stop the belt-driven variable diameter round baler from moving forward, and after the straw bales are wrapped with netting mechanism (4), the straw bales are discharged from the baling chamber (5). S6. Repeat steps S2 to S5 until the belt-driven variable diameter round baler completes all straw baling operations.

2. The belt-driven variable-diameter round strapping machine according to claim 1, characterized in that, The feeding mechanism (3) is located at the bottom entrance of the front pressure binding chamber (51), and the feeding mechanism (3) includes a forced feeding knife (31) rotatably mounted on the moving frame (1), and two auxiliary feeding rollers (32) rotatably mounted on the moving frame (1) are provided below the forced feeding knife (31).

3. The belt-driven variable-diameter round strapping machine according to claim 2, characterized in that, Two forming rollers (63) are rotatably arranged on the front pressing chamber (51) at the straw compression opening. The two forming rollers (63) are the first forming roller (631) and the second forming roller (632), respectively. The second forming roller (632) is located diagonally above the first forming roller (631), and multiple ribs are evenly fixed on the second forming roller (632).

4. The belt-driven variable-diameter round strapping machine according to claim 3, characterized in that, One end of the second forming roller (632) is chain-driven connected to the driving roller (61), and the other end of the second forming roller (632) is chain-driven connected to one end of the first forming roller (631). The other end of the first forming roller (631) is chain-driven connected to the output shaft of the gearbox (7). The gearbox (7) is fixed on the front pressure chamber (51).

5. The belt-driven variable-diameter round strapping machine according to claim 1, characterized in that, If the pressure values ​​detected by the first pressure sensor on the two limit arms (66) differ by more than 10% during the straw baling operation of the variable diameter round baler, the controller will activate the alarm.

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