Film cutting mechanism and film cutting method of straw bale wrapping machine

Abstract

The present invention relates to the technical field of agricultural machinery operation, and specifically to a film cutting mechanism of a straw bale wrapping machine and a film cutting method thereof, comprising a film clamping mechanism, a cutting mechanism and a driving mechanism for driving the film clamping mechanism to open and close, the film clamping mechanism comprising a main clamping plate and a secondary clamping plate, the horizontal cross-section of the main clamping plate is a convex shape, and the horizontal cross-section of the secondary clamping plate is a concave structure, the cutting mechanism comprises a vertical electric cylinder and a cutting part, a vertical strip hole is arranged in the middle of the secondary clamping plate, and the driving mechanism comprises an X-shaped rotating frame, the main clamping plate and the secondary clamping plate are respectively fixed at both ends of the X-shaped rotating frame, and the present invention can realize automatic cutting of the cut-off position of the plastic film after winding, improve the cutting efficiency and the straw bale winding efficiency; can cut the unfolded plastic film, and will not make the ends of the cut plastic film stick together, and through the film clamping mechanism, the waste of the plastic film caused by the deviation of the cutting route is avoided, thereby saving costs.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural machinery operation, in particular to a film cutting mechanism of a straw bale wrapping machine and a film cutting method thereof. Background Art

[0002] The existing straw bale wrapping machine wraps the plastic film around the straw bale. After wrapping is completed, the plastic film needs to be cut off. The existing method of cutting the plastic film is to manually hold a cutting tool to press the cut position of the unfolded plastic film into a strand, and use the cutting tool to cut the cut position of the plastic film. The cutting efficiency is low, and the straw bale wrapping efficiency is reduced. Since the plastic film has a certain viscosity, the cut positions stick together, causing a certain amount of waste. Summary of the invention

[0003] The object of the present invention is to provide a film cutting mechanism and a film cutting method for a straw bale wrapping machine, so as to solve the problems raised in the above-mentioned background technology.

[0004] The technical solution of the present invention is: a film cutting mechanism of a straw bale wrapping machine, including a film clamping mechanism, a cutting mechanism and a driving mechanism for driving the film clamping mechanism to open and close, the film clamping mechanism including a vertically arranged main clamping plate and a secondary clamping plate, the horizontal cross-section of the main clamping plate is a convex shape, and the horizontal cross-section of the secondary clamping plate is a concave structure, the convex surface of the main clamping plate and the concave surface of the secondary clamping plate can be tightly fitted, the cutting mechanism includes a vertical electric cylinder vertically arranged on a side of the secondary clamping plate away from the main clamping plate and a cutting part that is driven by the vertical electric cylinder, the middle of the secondary clamping plate is provided with a vertical strip hole for avoiding the cutting part, the driving mechanism includes an X-shaped rotating frame, the main clamping plate and the secondary clamping plate are respectively fixed at two ends of the X-shaped rotating frame, the X-shaped rotating frame includes two X-shaped rotating rods that are both horizontally arranged, the two X-shaped rotating rods are spaced apart in the vertical direction and both include a first rotating rod and a second rotating rod that are rotatably matched through a vertical rotating shaft, the two first The cam is fixed with a U-shaped frame at one end of the rotating rod, and the main clamping plate is rotatably matched with the U-shaped frame through a vertically arranged rotating shaft, and a limit block is arranged at the bottom of the main clamping plate, and a limit head is arranged at the bottom of the main clamping plate to cooperate with the limit block. A reset component is arranged between the bottom of the U-shaped frame and the bottom of the main clamping plate for driving the main clamping plate to always be held against the limit block. The reset component includes a first connecting rod, a second connecting rod and a reset spring, one end of the first connecting rod is hinged to the bottom end of the U-shaped frame, the other end of the first connecting rod is hinged to one end of the second connecting rod through a vertically arranged hinge shaft, and the other end of the second connecting rod is hinged to the bottom end of the main clamping plate. One end of the reset spring is sleeved on the hinge shaft, and the other end of the reset spring is fixed to the bottom end of the rotating shaft, and the angle between the center line of the first connecting rod and the center line of the second connecting rod is always less than 180 degrees, and the angle between the center line of the first connecting rod and the center line of the second connecting rod opens toward the rotating shaft.

[0005] Preferably, a vertical plate is fixed between one end of the two second rotating rods, the vertical electric cylinder is fixed on the vertical plate, a vertically arranged slide is installed on the vertical plate, a slider is slidably fitted on the slide, the vertical electric cylinder is transmission-coordinated with the slider, the cutting part includes a fixing bolt and a cutting knife horizontally installed on the slider, the cutting knife is installed on the slider by a fixing bolt, and the plane where the cutting knife is located can extend into the vertical bar hole.

[0006] Preferably, the driving mechanism also includes a driving assembly for driving the first rotating rod and the second rotating rod to rotate relative to each other, a first vertical axis is fixed between the two halves of the first rotating rods, a second vertical axis is fixed between the two halves of the second rotating rods, a U-shaped frame is rotatably mounted on the two vertical rotating shafts of the X-shaped rotating frame, a support rod is arranged on the side of the U-shaped frame, the U-shaped frame is sleeved on the support rod through a sleeve, and a locking bolt is arranged on the sleeve.

[0007] Preferably, the driving assembly includes a first connecting rod, a second connecting rod and a driving cylinder, one end of the first connecting rod and the second connecting rod are hinged to each other, the other end of the first connecting rod is rotatably mounted on the first vertical axis, and the other end of the second connecting rod is rotatably mounted on the second vertical axis, the output end of the driving cylinder is also hinged to one end of the first connecting rod and the second connecting rod that are hinged to each other, and the end of the driving cylinder is hinged to the middle section of the U-shaped frame.

[0008] Preferably, the sides of the main clamping plate and the secondary clamping plate are respectively provided with vertical magnetic strips with opposite magnetic poles, and the main clamping plate is provided with vertical avoidance grooves with the same length as the vertical strip holes.

[0009] Preferably, proximity sensors are provided at both ends of the vertical electric cylinder, all proximity sensors are electrically connected to a controller, and the driving cylinder is electrically connected to the controller.

[0010] Preferably, a film cutting method of a film cutting mechanism of a straw bale wrapping machine comprises the following steps:

[0011] Step S1: After the plastic film passes through the X-shaped rotating frame and passes through the main clamping plate and the secondary clamping plate to wrap around the straw bale, the output shaft of the driving cylinder is extended, and the first rotating rod and the second rotating rod rotate relatively, driving the main clamping plate to move toward the secondary clamping plate, and the reset assembly makes the main clamping plate fit tightly against the secondary clamping plate to clamp the plastic film;

[0012] Step S2: The controller controls the vertical electric cylinder to drive the cutting knife to descend vertically to cut the plastic film;

[0013] Step S3: Cutting is completed. When the proximity sensor at the bottom of the vertical electric cylinder senses the slider, it transmits an electrical signal to the controller. The controller controls the vertical electric cylinder to move in the opposite direction. When the proximity sensor at the top of the vertical electric cylinder senses the slider, it transmits an electrical signal to the controller. The controller controls the vertical electric cylinder to stop, the cutting knife resets, the output shaft of the driving cylinder retracts, and the main clamping plate and the secondary clamping plate separate.

[0014] The present invention provides a film cutting mechanism and a film cutting method of a straw bale wrapping machine through improvement, which has the following improvements and advantages compared with the prior art:

[0015] First: It can automatically cut the cut-off position after the plastic film is wrapped, improving the cutting efficiency and the bale wrapping efficiency;

[0016] Second, the unfolded plastic film can be cut without causing the ends of the cut plastic film to stick together, thus avoiding cost waste.

[0017] Thirdly, the film clamping mechanism can avoid the deviation of the cutting route, avoid the waste of plastic film caused by the deviation of the cutting route, and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further explained below in conjunction with the accompanying drawings and Examples:

[0019] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 The three-dimensional structure of the present invention is shown in FIG. Figure 3 ;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the X-shaped rotating frame and the film clamping mechanism of the present invention;

[0023] Figure 5 It is a three-dimensional assembly schematic diagram of the main clamping plate and the U-shaped frame of the present invention;

[0024] Figure 6 It is a three-dimensional assembly schematic diagram of the main clamping plate, the reset assembly and the U-shaped frame of the present invention;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the reset assembly and the U-shaped frame of the present invention;

[0026] Figure 8 This is a three-dimensional assembly diagram of the secondary clamping plate and cutting mechanism of the present invention. Figure 1 ;

[0027] Fig. 9 This is a three-dimensional assembly diagram of the secondary clamping plate and cutting mechanism of the present invention. Figure 2 .

[0028] Description of reference numerals:

[0029] Film clamping mechanism 1, main clamping plate 1a, limit head 1a1, vertical avoidance groove 1a2, vertical magnetic strip 1a3, secondary clamping plate 1b, vertical strip hole 1b1, cutting mechanism 2, cutting part 2a, fixing bolt 2a1, cutting knife 2a2, vertical electric cylinder 2b, vertical plate 2c, slide 2d, slider 2e, driving mechanism 3, X-shaped rotating frame 4, X-shaped rotating rod 4a, first rotating rod 4a1, second rotating rod 4a2, vertical rotating shaft 4a3, first vertical shaft 4a4, second vertical shaft 4a5, U-shaped frame 4b, limit block 4b1, rotating shaft 4b2, driving assembly 5, first connecting rod 5a, second connecting rod 5b, driving cylinder 5c, reset assembly 6, first connecting rod 6a, second connecting rod 6b, reset spring 6c, hinge shaft 6d, support rod 7, sleeve 7a, locking bolt 7b, U-shaped frame 7c, proximity sensor 8. DETAILED DESCRIPTION

[0030] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention provides a film cutting mechanism of a straw bale wrapping machine through improvement. Figure 1-Figure 8 As shown, it includes a film clamping mechanism 1, a cutting mechanism 2 and a driving mechanism 3 for driving the film clamping mechanism 1 to open and close, the film clamping mechanism 1 includes a main clamping plate 1a and a secondary clamping plate 1b arranged vertically, the horizontal cross-section of the main clamping plate 1a is a convex shape, and the horizontal cross-section of the secondary clamping plate 1b is a concave structure, the convex surface of the main clamping plate 1a and the concave surface of the secondary clamping plate 1b can fit tightly, the cutting mechanism 2 includes a vertical electric cylinder 2b arranged vertically on the side of the secondary clamping plate 1b away from the main clamping plate 1a and a cutting part 2a that cooperates with the vertical electric cylinder 2b in transmission A vertical bar hole 1b1 is provided in the middle of the secondary clamping plate 1b for avoiding the cutting part 2a. The driving mechanism 3 includes an X-shaped rotating frame 4. The main clamping plate 1a and the secondary clamping plate 1b are respectively fixed at both ends of the X-shaped rotating frame 4. After the plastic film passes through the driving mechanism 3 and the main clamping plate 1a and the secondary clamping plate 1b are wrapped around the straw bale, the driving mechanism 3 drives the main clamping plate 1a and the secondary clamping plate 1b to move toward each other, so that the main clamping plate 1a is tightly attached to the secondary clamping plate 1b to clamp the plastic film, and the vertical electric cylinder 2b drives the cutting part 2a to descend vertically to cut the plastic film.

[0032] The X-shaped rotating frame 4 includes two X-shaped rotating rods 4a, both of which are horizontally arranged. The two X-shaped rotating rods 4a are spaced apart in the vertical direction and both include a first rotating rod 4a1 and a second rotating rod 4a2 that are rotatably matched through a vertical rotating shaft 4a3. A U-shaped frame 4b is fixed between one end of the two first rotating rods 4a1. The main clamping plate 1a is rotatably matched with the U-shaped frame 4b through a vertically arranged rotating shaft 4b2. A limiting block 4b1 is arranged at the bottom of the U-shaped frame 4b. A limiting head 1a1 that abuts against the limiting block 4b1 is arranged at the bottom of the main clamping plate 1a. A reset component 6 for driving the main clamping plate 1a to always abut against the limiting block 4b1 is arranged between the bottom of the U-shaped frame 4b and the bottom of the main clamping plate 1a.

[0033] After the plastic film passes through the X-shaped rotating frame 4 and passes through the main clamping plate 1a and the secondary clamping plate 1b to complete wrapping around the straw bale, the output shaft of the driving cylinder 5c is extended, and the first rotating rod 4a1 and the second rotating rod 4a2 rotate relative to each other, driving the main clamping plate 1a to move toward the secondary clamping plate 1b, wherein the reset component 6 makes the limit head 1a1 at the bottom of the main clamping plate 1a fit tightly on the limit block 4b1, and the reset component 6 ensures that the main clamping plate 1a has a buffering function when it is not aligned with the secondary clamping plate 1b, thereby avoiding damage to the film clamping mechanism 1.

[0034] The reset assembly 6 includes a first connecting rod 6a, a second connecting rod 6b and a reset spring 6c, one end of the first connecting rod 6a is hinged to the bottom end of the U-shaped frame 4b, the other end of the first connecting rod 6a is hinged to one end of the second connecting rod 6b through a vertically arranged hinge shaft 6d, the other end of the second connecting rod 6b is hinged to the bottom end of the main clamping plate 1a, one end of the reset spring 6c is sleeved on the hinge shaft 6d, and the other end of the reset spring 6c is fixed to the bottom end of the rotating shaft 4b2, the reset spring 6c pulls the first connecting rod 6a and the second connecting rod 6b at one end that are hinged to each other, the first connecting rod 6a and the second connecting rod 6b respectively collide, the angle between the U-shaped frame 4b and the main clamping plate 1a increases, so that the limit head 1a1 of the main clamping plate 1a is always attached to the limit block 4b1.

[0035] The angle between the center line of the first connecting rod 6a and the center line of the second connecting rod 6b is always less than 180 degrees, and the angle between the center line of the first connecting rod 6a and the center line of the second connecting rod 6b opens toward the rotating shaft 4b2. Under the action of the reset spring 6c, the angle between the center line of the first connecting rod 6a and the center line of the second connecting rod 6b can be expanded to the maximum.

[0036] A vertical plate 2c is fixed between one end of the two second rotating rods 4a2, the vertical electric cylinder 2b is fixed on the vertical plate 2c, a vertically arranged slideway 2d is installed on the vertical plate 2c, a slider 2e is slidably fitted on the slideway 2d, the vertical electric cylinder 2b is transmission-coordinated with the slider 2e, the cutting part 2a includes a fixing bolt 2a1 and a cutting knife 2a2 horizontally installed on the slider 2e, the cutting knife 2a2 is installed on the slider 2e by the fixing bolt 2a1, the plane where the cutting knife 2a2 is located can extend into the vertical bar hole 1b1, when the main clamping plate 1a and the secondary clamping plate 1b clamp the plastic film, the vertical electric cylinder 2b drives the cutting knife 2a2 to rise and fall through the vertical bar hole 1b1 to cut the plastic film between the main clamping plate 1a and the secondary clamping plate 1b.

[0037] The driving mechanism 3 also includes a driving assembly 5 for driving the first rotating rod 4a1 and the second rotating rod 4a2 to rotate relative to each other. A first vertical axis 4a4 is fixed between the two halves of the first rotating rods 4a1, and a second vertical axis 4a5 is fixed between the two halves of the second rotating rods 4a2. A U-shaped frame 7c is rotatably mounted on the two vertical rotating shafts 4a3 of the X-shaped rotating frame 4. A support rod 7 is arranged on the side of the U-shaped frame 7c. The U-shaped frame 7c is sleeved on the support rod 7 through a sleeve 7a. A locking bolt 7b is arranged on the sleeve 7a. The height of the film clamping mechanism 1 can be adjusted by adjusting the position of the sleeve 7a on the support rod 7.

[0038] The driving assembly 5 includes a first connecting rod 5a, a second connecting rod 5b and a driving cylinder 5c. One end of the first connecting rod 5a and the second connecting rod 5b are hinged to each other, the other end of the first connecting rod 5a is rotatably mounted on the first vertical shaft 4a4, and the other end of the second connecting rod 5b is rotatably mounted on the second vertical shaft 4a5. The output end of the driving cylinder 5c is also hinged to one end of the first connecting rod 5a and the second connecting rod 5b that are hinged to each other. The end of the driving cylinder 5c is connected to the U-shaped frame 7c. The middle section is hinged, and the output shaft of the driving cylinder 5c is extended, so that the first vertical axis 4a4 and the second vertical axis 4a5 rotate in opposite directions, and the first rotating rod 4a1 and the second rotating rod 4a2 move in opposite directions, so that the main clamping plate 1a and the secondary clamping plate 1b are tightly fitted, and the output shaft of the driving cylinder 5c is retracted, so that the first vertical axis 4a4 and the second vertical axis 4a5 rotate in opposite directions, and the first rotating rod 4a1 and the second rotating rod 4a2 move in opposite directions, so that the main clamping plate 1a and the secondary clamping plate 1b are separated.

[0039] The sides of the main clamping plate 1a and the secondary clamping plate 1b are respectively provided with vertical magnetic strips 1a3 with opposite magnetic poles, and the main clamping plate 1a is provided with a vertical avoidance groove 1a2 with the same length as the vertical strip hole 1b1. When the main clamping plate 1a and the secondary clamping plate 1b are tightly fitted, the vertical magnetic strip 1a3 can ensure that the main clamping plate 1a and the secondary clamping plate 1b will not shake after being tightly fitted. At the same time, the vertical avoidance groove 1a2 and the cutting knife 2a2 pass through the vertical avoidance groove 1a2 during the cutting process, ensuring that the cutting knife 2a2 can completely cut the plastic film.

[0040] Both ends of the vertical electric cylinder 2b are provided with proximity sensors 8, and all proximity sensors 8 are electrically connected to a controller. The driving cylinder 5c is electrically connected to the controller. The controller is not shown in the figure. A programmable logic controller is used. It is a digital operation controller with a microprocessor for automatic control. The control instructions can be loaded into the memory at any time for storage and execution. The programmable logic controller is a prior art and does not need to be described in detail here. The model of the programmable logic controller is SIMATIC S7-400. The model of the proximity sensor 8 is NPN type TL-Q5MC1. The proximity sensor 8 is a prior art and does not need to be described in detail here. The controller is electrically connected to a start-stop switch, and the motor of the vertical electric cylinder 2b is a servo motor.

[0041] A film cutting method of a film cutting mechanism of a straw bale wrapping machine comprises the following steps:

[0042] Step S1: After the plastic film passes through the X-shaped rotating frame 4 and passes through the main clamping plate 1a and the secondary clamping plate 1b to wrap around the straw bale, the output shaft of the driving cylinder 5c is extended, and the first rotating rod 4a1 and the second rotating rod 4a2 rotate relative to each other, driving the main clamping plate 1a to move toward the secondary clamping plate 1b, and the reset assembly 6 makes the main clamping plate 1a fit tightly on the secondary clamping plate 1b to clamp the plastic film;

[0043] Step S2: The controller controls the vertical electric cylinder 2b to drive the cutting knife 2a2 to vertically descend to cut the plastic film;

[0044] Step S3: Cutting is completed. When the proximity sensor 8 at the bottom of the vertical electric cylinder 2b senses the slider 2e, it transmits an electrical signal to the controller. The controller controls the vertical electric cylinder 2b to move in the opposite direction. When the proximity sensor 8 at the top of the vertical electric cylinder 2b senses the slider 2e, it transmits an electrical signal to the controller. The controller controls the vertical electric cylinder 2b to stop, the cutting knife 2a2 is reset, the output shaft of the driving cylinder 5c is retracted, and the main clamping plate 1a and the secondary clamping plate 1b are separated.

[0045] Working principle:

[0046] Step S1: After the plastic film passes through the X-shaped rotating frame 4 and passes through the main clamping plate 1a and the secondary clamping plate 1b to wrap the straw bale, the start-stop switch is pressed to transmit an electrical signal X1 to the controller, and the controller outputs a signal Y1 to the reversing valve on the air source of the driving cylinder 5c. The air circuit of the driving cylinder 5c is the prior art and will not be described in detail here. The output shaft of the driving cylinder 5c extends, and the first rotating rod 4a1 and the second rotating rod 4a2 rotate relative to each other, driving the main clamping plate 1a to move toward the secondary clamping plate 1b, and the reset assembly 6 makes the main clamping plate 1a fit tightly on the secondary clamping plate 1b to clamp the plastic film;

[0047] Step S2: After a certain time interval after the controller outputs the signal Y1, it outputs the signal Y2 to the vertical electric cylinder 2b again, and the vertical electric cylinder 2b drives the cutting knife 2a2 to vertically descend to cut the plastic film;

[0048] Step S3: When the proximity sensor 8 at the bottom of the vertical electric cylinder 2b senses the slider 2e, the cutting is completed and an electrical signal X2 is transmitted to the controller. The controller outputs a signal Y3 to the vertical electric cylinder 2b, and the vertical electric cylinder 2b moves in the opposite direction. When the proximity sensor 8 at the top of the vertical electric cylinder 2b senses the slider 2e, an electrical signal is transmitted to the controller. The controller controls the vertical electric cylinder 2b to stop and the cutting knife 2a2 is reset. The controller outputs a signal Y3 and a signal Y4 to the reversing valve on the air source of the driving cylinder 5c. The output shaft of the driving cylinder 5c retracts and the main clamping plate 1a and the secondary clamping plate 1b are separated.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A film cutting mechanism for a straw bale wrapping machine, characterized in that: The invention comprises a film clamping mechanism (1), a cutting mechanism (2) and a driving mechanism (3) for driving the film clamping mechanism (1) to open and close. The film clamping mechanism (1) comprises a main clamping plate (1a) and a secondary clamping plate (1b) which are arranged vertically. The horizontal cross section of the main clamping plate (1a) is a convex shape, and the horizontal cross section of the secondary clamping plate (1b) is a concave structure. The convex surface of the main clamping plate (1a) and the concave surface of the secondary clamping plate (1b) can fit tightly. The cutting mechanism (2) comprises a vertical electric cylinder (2b) which is vertically arranged on a side of the secondary clamping plate (1b) away from the main clamping plate (1a) and a cutting portion (2a) which cooperates with the vertical electric cylinder (2b) in transmission. The secondary clamping plate (1b) is provided with a vertical bar hole (1b1) in the middle thereof for avoiding the cutting portion (2a); the driving mechanism (3) comprises an X-shaped rotating frame (4); the primary clamping plate (1a) and the secondary clamping plate (1b) are respectively fixed at two ends of the X-shaped rotating frame (4); the X-shaped rotating frame (4) comprises two X-shaped rotating rods (4a) both arranged horizontally; the two X-shaped rotating rods (4a) are arranged at intervals in the vertical direction and both comprise a first rotating rod (4a1) and a second rotating rod (4a2) which are rotatably matched via a vertical rotating shaft (4a3); a U-shaped frame (4b) is fixed between one end of the two first rotating rods (4a1); The main clamping plate (1a) is rotatably matched with the U-shaped frame (4b) via a vertically arranged rotating shaft (4b2); a limit block (4b1) is arranged at the bottom of the U-shaped frame (4b); a limit head (1a1) is arranged at the bottom of the main clamping plate (1a) for contacting and matching with the limit block (4b1); a reset component (6) for driving the main clamping plate (1a) to always contact the limit block (4b1) is arranged between the bottom of the U-shaped frame (4b) and the bottom of the main clamping plate (1a); the reset component (6) comprises a first connecting rod (6a), a second connecting rod (6b) and a reset spring (6c); one end of the first connecting rod (6a) is connected to the U-shaped frame (4b); and the second connecting rod (6b) and the reset spring (6c) are connected to the U-shaped frame (4b); and the reset component (6) comprises a first connecting rod (6a), a second connecting rod (6b) and a reset spring (6c); and one end of the first connecting rod (6a) is connected to the U-shaped frame (4b); and the second connecting rod (6b) and the reset spring (6c) are connected to the U-shaped frame (4b); and the first connecting rod (6a ... The bottom end of the frame (4b) is hinged, the other end of the first connecting rod (6a) is hinged to one end of the second connecting rod (6b) through a vertically arranged hinge shaft (6d), the other end of the second connecting rod (6b) is hinged to the bottom end of the main clamping plate (1a), one end of the return spring (6c) is sleeved on the hinge shaft (6d), and the other end of the return spring (6c) is fixed to the bottom end of the rotating shaft (4b2), the center line of the first connecting rod (6a) and the center line of the second connecting rod (6b) are always less than 180 degrees, and the center line of the first connecting rod (6a) and the center line of the second connecting rod (6b) are open toward the rotating shaft (4b2).

2. The film cutting mechanism of the straw bale wrapping machine according to claim 1, characterized in that: A vertical plate (2c) is fixed between one end of the two second rotating rods (4a2); the vertical electric cylinder (2b) is fixed on the vertical plate (2c); a vertically arranged slideway (2d) is installed on the vertical plate (2c); a slider (2e) is slidably matched on the slideway (2d); the vertical electric cylinder (2b) and the slider (2e) are transmission matched; the cutting part (2a) comprises a fixing bolt (2a1) and a cutting knife (2a2) horizontally mounted on the slider (2e); the cutting knife (2a2) is mounted on the slider (2e) via the fixing bolt (2a1); and the plane where the cutting knife (2a2) is located can extend into the vertical bar hole (1b1).

3. The film cutting mechanism of the straw bale wrapping machine according to claim 2, characterized in that: The driving mechanism (3) further comprises a driving assembly (5) for driving the first rotating rod (4a1) and the second rotating rod (4a2) to rotate relative to each other; a first vertical shaft (4a4) is fixed between the two halves of the first rotating rods (4a1); a second vertical shaft (4a5) is fixed between the two halves of the second rotating rods (4a2); a U-shaped frame (7c) is rotatably mounted on the two vertical rotating shafts (4a3) of the X-shaped rotating frame (4); a supporting rod (7) is arranged on the side of the U-shaped frame (7c); the U-shaped frame (7c) is sleeved on the supporting rod (7) via a sleeve (7a); and a locking bolt (7b) is arranged on the sleeve (7a).

4. The film cutting mechanism of the straw bale wrapping machine according to claim 3, characterized in that: The driving assembly (5) comprises a first connecting rod (5a), a second connecting rod (5b) and a driving cylinder (5c); one end of the first connecting rod (5a) and the second connecting rod (5b) are hinged to each other; the other end of the first connecting rod (5a) is rotatably mounted on a first vertical shaft (4a4); the other end of the second connecting rod (5b) is rotatably mounted on a second vertical shaft (4a5); the output end of the driving cylinder (5c) is simultaneously hinged to one end of the first connecting rod (5a) and the second connecting rod (5b) that are hinged to each other; and the end of the driving cylinder (5c) is hinged to the middle section of the U-shaped frame (7c).

5. The film cutting mechanism of the straw bale wrapping machine according to claim 1, characterized in that: The sides of the main clamping plate (1a) and the secondary clamping plate (1b) are respectively provided with vertical magnetic strips (1a3) with opposite magnetic poles, and the main clamping plate (1a) is provided with a vertical avoidance groove (1a2) with the same length as the vertical strip hole (1b1).

6. The film cutting mechanism of the straw bale wrapping machine according to claim 4, characterized in that: Both ends of the vertical electric cylinder (2b) are provided with proximity sensors (8), all proximity sensors (8) are electrically connected to a controller, and the driving cylinder (5c) is electrically connected to the controller.

7. The film cutting method of the film cutting mechanism of the straw bale wrapping machine according to claim 6, characterized in that: The following steps are included: Step S1: After the plastic film passes through the X-shaped rotating frame (4) and passes through the main clamping plate (1a) and the secondary clamping plate (1b) to wrap around the straw bale, the output shaft of the driving cylinder (5c) is extended, and the first rotating rod (4a1) and the second rotating rod (4a2) rotate relative to each other, driving the main clamping plate (1a) to move toward the secondary clamping plate (1b), and the reset component (6) makes the main clamping plate (1a) fit tightly against the secondary clamping plate (1b) to clamp the plastic film; Step S2: the controller controls the vertical electric cylinder (2b) to drive the cutting knife (2a2) to descend vertically to cut the plastic film; Step S3: Cutting is completed. When the proximity sensor (8) at the bottom of the vertical electric cylinder (2b) senses the slider (2e), an electrical signal is transmitted to the controller. The controller controls the vertical electric cylinder (2b) to move in the opposite direction. When the proximity sensor (8) at the top of the vertical electric cylinder (2b) senses the slider (2e), an electrical signal is transmitted to the controller. The controller controls the vertical electric cylinder (2b) to stop, the cutting knife (2a2) is reset, the output shaft of the driving cylinder (5c) is retracted, and the main clamping plate (1a) and the secondary clamping plate (1b) are separated.

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