A compression mechanism and method for a square bale baler for grass material

Abstract

The present application relates to a kind of grass material square bale baler compression mechanism and method, belong to the technical field of agricultural machinery.The compression mechanism includes crank mechanism, including two cranks, crank shaft, crank shaft end cover and bracket bearing seat;Connecting rod, including two U-shaped channel steel frame, front end plate, reinforcing plate and rear end plate;Small piston, including two side push block, multiple intermediate push block, upper cross beam, lower cross beam, connecting rod fixed sleeve and connecting rod connecting plate;Big piston, including two side push block, multiple upper intermediate push block and lower intermediate push block, upper cross beam, lower cross beam;Piston combination and separation mechanism, including rotary cam shaft, locking vertical plate, locking vertical plate seat, upper locking slide seat, locking support, lower locking slide seat, tension spring.Piston combination and separation mechanism can realize the combination and separation of big and small piston, decompose piston mass, reduce the inertia impact and vibration when piston moves, effectively reduce the power consumption of compression mechanism in the process of grass material compression.The present application also provides a kind of grass material compression forming method.

Description

TECHNICAL FIELD

[0001] The present application relates to the agricultural machinery technology, in particular to a grass material square bale baler compression mechanism and method. BACKGROUND

[0002] The baling operation is the mechanized field harvesting of the straw of the pasture grass and the crops such as rice and wheat, and is an effective way to realize the high-value utilization. The large square bale baler with the pre-compression function has a high baling rate, and the formed bale has a regular shape, is dense, and has a large weight. The operation is efficient and reliable, and is convenient for realizing the field transportation and storage.

[0003] An important link in the operation of the square bale baler is the compression forming. The quick-return characteristic of the offset crank slider mechanism is used to convert the rotary motion of the crank into the reciprocating motion of the piston to realize the compression of the grass material. That is, the loose grass material continuously fed into the compression chamber is gradually formed into a square bale with a regular shape through the reciprocating motion of the piston of the compression mechanism to compress the grass pieces multiple times. The piston of the compression mechanism of the large square bale baler reciprocates in the compression chamber. After the grass material is fed into the compression chamber by the feeding fork of the baler, the piston pushes the loose grass material backward to gradually form the grass pieces. The required compression force gradually increases until the compression force exceeds the friction force between the grass material and the compression chamber, and then the grass pieces move backward and the compression force decreases. In order to prevent the rebound of the compressed grass material, the compression mechanism needs to continuously reciprocate to compress.

[0004] The piston of the traditional compression mechanism of the large square bale baler is usually of an integrated welded structure. The weight is large, the motion inertia is large, the impact and vibration during the movement in the compression chamber are large, the power consumption is large when the grass material is compacted according to the designed compression frequency, and the energy consumption of the whole machine is high. In addition, due to the large friction between the piston and the compression chamber during the movement, the wear is serious, the running stability of the piston is reduced, the vibration and noise are increased, and the performance of the piston is continuously reduced. With the continuous improvement of the reliability requirement of the baler, the improvement design of the piston of the compression mechanism is proposed to reduce the inertia force of the piston and the power consumption of the piston, so as to ensure the performance of the whole square bale baler. SUMMARY

[0005] The present application solves the technical problems in the prior art and provides a grass material square bale baler compression mechanism and method.

[0006] In order to achieve the above-mentioned purpose, the present application provides a grass material square bale baler compression mechanism, which comprises:

[0007] The crank mechanism comprises two cranks, a crank shaft, a crank shaft end cover and a bracket bearing seat, the small end of each crank is connected with the bracket bearing seat and the crank shaft end cover through the crank shaft, and the bracket bearing seat can rotate around the crank shaft.

[0008] The connecting rod includes two U-shaped channel steel frames, a front end plate, a reinforcing plate, and a rear end plate, arranged symmetrically;

[0009] The small piston includes two side push blocks, multiple intermediate push blocks, two upper crossbeams, a lower crossbeam, four connecting rod fixing sleeves, and four connecting rod connecting plates. The multiple intermediate push blocks are arranged in parallel at equal intervals, and the two side push blocks are arranged on both sides respectively. They are welded to the upper crossbeam and the lower crossbeam. Multiple rollers are installed on the side push blocks to reduce the resistance when the piston moves in the compression chamber. The connecting rod fixing sleeves pass through the holes of the connecting rod connecting plates and are fixed together, and then fixedly welded to the two intermediate push blocks in pairs.

[0010] A large piston includes two side thrust blocks, multiple upper intermediate thrust blocks, multiple lower intermediate thrust blocks, two upper crossbeams, and a lower crossbeam. The multiple upper and lower intermediate thrust blocks are arranged in parallel at equal intervals, with the two side thrust blocks positioned on either side and fixed to the upper and lower crossbeams. Multiple rollers are mounted on the side thrust blocks to reduce resistance during piston movement within the compression chamber.

[0011] The piston engagement / disengagement mechanism includes a rotary camshaft, a locking plate, a locking plate seat, two upper locking slide seats, four locking supports, two lower locking slide seats, and a tension spring. The lower locking slide seats and the locking supports are fixed to the middle of the upper crossbeam of the small piston, and the upper locking slide seats are fixed to the middle of the upper crossbeam of the large piston. The rotary camshaft is connected to the small piston through locking support holes. A disc-shaped cam on the rotary camshaft engages with the locking plate. When the maximum contour position of the disc-shaped cam contacts the locking plate, the protruding end of the locking plate, fixed to the locking plate seat, enters the rectangular groove of the upper locking slide seat. The large piston and the small piston are combined to form a whole, and reciprocate together with the movement of the crank and the connecting rod. When the minimum profile position of the disc cam contacts the locking plate, the protruding end of the locking plate, which is fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat. Then the large piston and the small piston separate, and only the small piston reciprocates with the movement of the crank and the connecting rod. The locking plate is fixed to the locking plate seat and embedded in the lower locking slide seat, and can slide in the slide formed by the combination of the lower locking slide seat and the upper locking slide seat. The tension spring ensures that the locking plate is in effective contact with the rotating camshaft.

[0012] The compression mechanism of the aforementioned straw bale baler further includes two connecting rod connectors and connecting rod connector pins. One end of each connecting rod connector is fixed to the connecting rod, and the other end is connected to the connecting rod fixing sleeve via the connecting rod connector pin.

[0013] In the compression mechanism of the above-mentioned square baler for straw materials, the connecting rod connects the crank to the small piston. One end of the connecting rod is fixed to the bracket bearing seat and connected to the crank, and can rotate around the crank shaft. The other end is fixed to the connecting rod connector and connected to the small piston through the connecting rod connector pin, and can rotate around the connecting rod connector pin.

[0014] The compression mechanism of the above-mentioned straw bale baler includes a piston engagement and separation mechanism that enables the engagement and separation of large and small pistons. Its structural form includes the structure shown in this invention and other structures that can achieve the same function.

[0015] To better achieve the above objectives, the present invention also provides a compression molding method, wherein the compression molding of grass material using the above-mentioned compression mechanism includes the following steps:

[0016] S100. When compression begins, the large piston and the small piston of the compression mechanism are adjusted to the engagement position according to the working conditions, so that the maximum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate fixed on the locking plate seat enters the rectangular groove of the upper locking slide seat, and the large piston and the small piston are engaged to form a whole, which is the initial position.

[0017] S200. If no forage material is fed into the compression chamber, the minimum profile position of the rotary camshaft disc cam contacts the locking plate, and the protruding end of the locking plate fixed on the locking plate seat slides out of the rectangular groove of the upper locking slide seat. Then, the large piston and the small piston separate, and the small piston reciprocates in the compression chamber under the drive of the crank and the connecting rod; until...

[0018] S300: The first batch of grass material is fed into the compression chamber. The maximum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate, fixed on the locking plate seat, enters the rectangular groove of the upper locking slide seat. The large piston and the small piston combine to form a piston assembly, which moves towards the rear of the compression chamber, pushing and compacting the grass material to form grass flakes. After the piston assembly moves to the end of its stroke, it returns to the initial position. Then, the minimum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate, fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat, and the large piston and the small piston separate.

[0019] S400, the small piston, driven by the crank mechanism and the connecting rod, continues to reciprocate within the compression chamber to compact the straw and prevent it from springing back; until...

[0020] S500, the next batch of forage is fed into the compression chamber. The maximum contour position of the rotary camshaft disc cam contacts the locking plate. The extended end of the locking plate, fixed on the locking plate seat, re-enters the rectangular groove of the upper locking slide seat. The large piston and the small piston of the compression mechanism re-combine to form a piston assembly, moving backward in the compression chamber to push the forage and the first-formed forage to compact. After the piston reaches the end of its stroke, it returns to its initial position. Then, the minimum contour position of the rotary camshaft disc cam contacts the locking plate. The extended end of the locking plate, fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat. The large piston and the small piston separate again.

[0021] S600, S400 to S500 are repeated continuously to compress and shape the grass material. After the grass bale reaches the set length, it is discharged from the compression chamber. The compression mechanism operates continuously until the machine stops working.

[0022] The technical advantages of this invention are as follows:

[0023] The compression mechanism of the present invention employs a split-nested piston structure. When grass material is fed into the compression chamber, the small piston and the large piston combine to form a piston assembly that moves with the crank-connecting rod mechanism to compact the grass material. When no grass material is fed into the compression chamber, only the small piston reciprocates with the crank-connecting rod mechanism. This structure can decompose the piston mass, reduce the inertial impact and vibration during the piston movement of the compression mechanism, and effectively reduce the power consumption of the compression mechanism during the grass material compression process.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the compression mechanism structure according to an embodiment of the invention;

[0026] Figure 2 A schematic diagram of a crank mechanism according to an embodiment of the invention;

[0027] Figure 3 This is a schematic diagram of a linkage structure according to an embodiment of the invention;

[0028] Figure 4 This is a schematic diagram of a small piston structure according to an embodiment of the invention;

[0029] Figure 5 A schematic diagram of a small piston side pusher block according to an embodiment of the invention;

[0030] Figure 6 A schematic diagram of the intermediate push block structure of a small piston according to an embodiment of the invention;

[0031] Figure 7This is a schematic diagram of the small piston side push block two according to an embodiment of the invention;

[0032] Figure 8 A schematic diagram of a large piston structure according to an embodiment of the invention;

[0033] Figure 9 A schematic diagram of a large piston side thrust block according to an embodiment of the invention;

[0034] Figure 10 A schematic diagram of the intermediate push block structure on the large piston according to an embodiment of the invention;

[0035] Figure 11 A schematic diagram of the lower intermediate push block structure of a large piston according to an embodiment of the invention;

[0036] Figure 12 This is a schematic diagram of the structure of the large piston side thrust block two according to an embodiment of the invention;

[0037] Figure 13 This is a schematic diagram of the compression mechanism at a certain moment according to an embodiment of the invention.

[0038] Among them, the attached figures are labeled

[0039] 1. Crank mechanism

[0040] 11 Crank

[0041] 12 Crankshaft

[0042] 13 Crankshaft end cap

[0043] 14 Bracket Bearing Housing

[0044] 2-link

[0045] 21 U-shaped channel steel frame

[0046] 22 Front end board

[0047] 23 Reinforcing Plate

[0048] 24 Backend Board

[0049] 3 small pistons

[0050] 31 Side Push Block One

[0051] 32. Upper crossbeam

[0052] 33 Middle Push Block

[0053] 34 Side Push Block Two

[0054] 35 Lower locking slide seat

[0055] 36 Locking Support

[0056] 37 Connecting rod retaining sleeve

[0057] 38 Linkage Connector Plate

[0058] 39 Lower crossbeam

[0059] 4 large pistons

[0060] 41 Side Push Block One

[0061] 42 Upper Middle Push Block

[0062] 43. Upper crossbeam

[0063] 44 Upper locking slide seat

[0064] 45 Side Push Block Two

[0065] 46 Lower Middle Push Block

[0066] 47 Lower crossbeam

[0067] 5 Piston engagement and disengagement mechanism

[0068] 51 Locking plate

[0069] 52 Locking Stand Base

[0070] 53 Rotary Camshaft

[0071] 54 tension spring

[0072] 6 small rollers

[0073] 7 large rollers

[0074] 8. Linkage connector

[0075] 9. Connecting rod connector pin Detailed Implementation

[0076] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:

[0077] See Figure 1 , Figure 1This is a schematic diagram of the compression mechanism according to an embodiment of the invention. The compression mechanism of the hay bale baler of the present invention includes: a crank mechanism 1, a connecting rod 2, a small piston 3, a large piston 4, a locking plate 51, a locking plate seat 52, a rotary camshaft 53, a tension spring 54, a small roller 6, a large roller 7, a connecting rod connector 8, and a connecting rod connector pin 9. The small end of the crank mechanism 1 is connected to one end of the connecting rod 2 through a crankshaft 12 and a bracket bearing seat 14. The other end of the connecting rod 2 is connected to the small piston 3 through the connecting rod connector 8 and the connecting rod connector pin 9. The large piston 4 is nested outside the small piston 3. The locking plate 51 and the locking plate seat 52 are welded and fixed together. The small piston 3 and the large piston 4 are engaged and disengaged through the coordinated movement of the locking plate 51 and the rotary camshaft 53. The tension spring 54 ensures effective contact between the locking plate 51 and the rotary camshaft 53.

[0078] See Figure 2 , Figure 2 This is a schematic diagram of a crank mechanism according to an embodiment of the invention. The crank mechanism 1 includes two cranks 11, a crankshaft 12, a crankshaft end cap 13, and a bracket bearing seat 14. The small end of each crank mechanism 1 is connected to the bracket bearing seat 14 and the crankshaft end cap 13 through the crankshaft 12. The bracket bearing seat 14 is rotatable around the crankshaft 12.

[0079] See Figure 3 , Figure 3 This is a schematic diagram of a connecting rod structure according to an embodiment of the invention. The connecting rod 2 includes a U-shaped channel steel frame 21, a front end plate 22, a reinforcing plate 23, and a rear end plate 24. The two U-shaped channel steel frames 21 are symmetrically welded along their long sides, and the front end plate 22 and the rear end plate 24 are welded to their respective ends. The reinforcing plates 23 are welded to both sides, and the two frames are symmetrically arranged.

[0080] See Figure 4 , Figure 4 This is a schematic diagram of a small piston structure according to an embodiment of the invention. The small piston 3 includes a side push block 31, a side push block 34, multiple intermediate push blocks 33, two upper crossbeams 32, a lower crossbeam 39, a connecting rod fixing sleeve 37, and a connecting rod connecting plate 38. The multiple intermediate push blocks 33 are arranged in parallel at equal intervals. The side push blocks 31 and 34, which are respectively arranged on both sides, are fixed on the upper crossbeams 32 and the lower crossbeams 39. Multiple rollers are installed on the side push blocks 31 and 34 to reduce the resistance when the piston moves in the compression chamber. The connecting rod fixing sleeve 37 passes through the hole in the connecting rod connecting plate 38 and is fixed together, and then fixedly welded to the two intermediate push blocks 33 in pairs.

[0081] See Figure 5 , Figure 5 This is a schematic diagram of the structure of the small piston side pusher block 31 according to an embodiment of the invention.

[0082] SeeFigure 6 , Figure 6 A schematic diagram of the structure of the small piston intermediate pusher block 33 according to an embodiment of the invention.

[0083] See Figure 7 , Figure 7 A schematic diagram of the structure of the small piston side pusher block 34 according to an embodiment of the invention.

[0084] See Figure 8 , Figure 8 This is a schematic diagram of a large piston structure according to an embodiment of the invention. The large piston 4 includes a side push block 41, a side push block 45, multiple upper intermediate push blocks 42, multiple lower intermediate push blocks 46, two upper crossbeams 43, and a lower crossbeam 47. The multiple upper intermediate push blocks 42 and lower intermediate push blocks 46 are arranged in parallel at equal intervals in corresponding combinations. The side push blocks 41 and 45, which are respectively arranged on both sides, are fixed on the upper crossbeams 43 and lower crossbeams 47. Multiple rollers are installed on the side push blocks 41 and 45 to reduce the resistance when the piston moves in the compression chamber.

[0085] See Figure 9 , Figure 9 This is a schematic diagram of the structure of the large piston side thrust block 41 according to an embodiment of the invention.

[0086] See Figure 10 , Figure 10 This is a schematic diagram of the structure of the intermediate pusher block 42 on the large piston according to an embodiment of the invention.

[0087] See Figure 11 , Figure 11 This is a schematic diagram of the structure of the lower intermediate push block 46 of the large piston in one embodiment of the invention.

[0088] See Figure 12 , Figure 12 A schematic diagram of the structure of the large piston side thrust block 45 according to an embodiment of the invention.

[0089] See Figure 1 The piston-separation mechanism 5 includes a locking plate 51, a locking plate seat 52, a rotary camshaft 53, two upper locking slide seats 44, four locking supports 36, two lower locking slide seats 35, and a tension spring 54. The lower locking slide seats 35 and the locking supports 36 are fixed at the middle of the upper crossbeam 32 of the small piston 3, and the upper locking slide seats 44 are fixed at the middle of the upper crossbeam 43 of the large piston 4. The rotary camshaft 53 is connected to the small piston 3 through the holes of the locking supports 36 on the small piston 3. The locking plate 51 is fixed to the locking plate seat 52 and embedded in the lower locking slide seats 35, and can slide in the slide formed by the combination of the lower locking slide seats 35 and the upper locking slide seats 44. The tension spring 54 ensures that the locking plate 51 and the rotary camshaft 53 are in effective contact.

[0090] In this embodiment, the compression mechanism of the above-mentioned straw bale baler further includes two connecting rod connectors 8 and connecting rod connector pins 9. One end of the connecting rod connector 8 is fixed to the connecting rod 2, and the other end is connected to the connecting rod fixing sleeve 37 through the connecting rod connector pin 9.

[0091] In this embodiment, the compression mechanism of the above-mentioned straw bale baler includes a connecting rod 2 that connects the crank mechanism 1 to the small piston 3. One end of the connecting rod 2 is fixed to the bracket bearing seat 14 and connected to the crank mechanism 1, and can rotate around the crank shaft 12. The other end is fixed to the connecting rod connector 8 and connected to the small piston 3 through the connecting rod connector pin 9, and can rotate around the connecting rod connector pin 9.

[0092] In this embodiment, the compression mechanism of the above-mentioned straw bale baler includes a disc-shaped cam on the rotating camshaft 53 of the piston-separation mechanism 5 that contacts the locking plate 51. When the maximum contour position of the disc-shaped cam on the rotating camshaft 53 contacts the locking plate 51, the extended end of the locking plate 51 fixed on the locking plate seat 52 enters the rectangular groove of the upper locking slide seat 44, and the large piston 4 and the small piston 3 combine to form a whole, reciprocating under the drive of the crank mechanism 1 and the connecting rod 2. When the minimum contour position of the disc-shaped cam on the rotating camshaft 53 contacts the locking plate 51, the extended end of the locking plate 51 fixed on the locking plate seat 52 slides out of the rectangular groove of the upper locking slide seat 44, and the large piston 4 and the small piston 3 separate. At this time, the small piston 3 reciprocates under the drive of the crank mechanism 1 and the connecting rod 2.

[0093] In this embodiment, the compression mechanism of the above-mentioned straw bale baler includes a piston-connection and separation mechanism 5, which can realize the connection and separation of the large piston 4 and the small piston 3. Its structural form includes the structure shown in this invention and other structures that can achieve the same function.

[0094] See Figure 13 , Figure 13 This is a schematic diagram of the compression mechanism at a certain moment according to an embodiment of the invention.

[0095] To better achieve the above objectives, the present invention also provides a compression molding method, wherein the compression molding of grass material using the above-mentioned compression mechanism includes the following steps:

[0096] S100. When compression begins, adjust the large piston 4 and small piston 3 of the compression mechanism to the engagement position according to the working conditions, so that the maximum profile position of the disc cam of the rotary camshaft 53 contacts the locking plate 51, and the protruding end of the locking plate 51 fixed on the locking plate seat 52 enters the rectangular groove of the upper locking slide seat 44, then the large piston 4 and small piston 3 engage to form a whole, and this is the initial position.

[0097] S200. If no forage material is fed into the compression chamber, the minimum profile position of the disc cam on the rotary camshaft 53 contacts the locking plate 51. The protruding end of the locking plate 51, fixed on the locking plate seat 52, slides out of the rectangular groove of the upper locking slide seat 44. Then, the large piston 4 and the small piston 3 separate. The small piston 3 reciprocates in the compression chamber under the drive of the crank mechanism 1 and the connecting rod 2; until...

[0098] S300, the first batch of grass material is fed into the compression chamber. The maximum contour position of the disc cam of the rotating camshaft 53 contacts the locking plate 51. The extended end of the locking plate 51, which is fixed on the locking plate seat 52, enters the rectangular groove of the upper locking slide seat 44. The large piston 4 and the small piston 3 combine to form a piston assembly, which moves to the rear of the compression chamber, pushing and compacting the grass material to form grass flakes. After the piston moves to the end of its stroke, it returns to the initial position. Then, the minimum contour position of the disc cam of the rotating camshaft 53 contacts the locking plate 51. The extended end of the locking plate 51, which is fixed on the locking plate seat 52, slides out of the rectangular groove of the upper locking slide seat 44, and the large piston 4 and the small piston 3 separate.

[0099] S400 and small piston 3, driven by crank mechanism 1 and connecting rod 2, continue to reciprocate in the compression chamber to compact the straw and prevent it from springing back. Their working state at a certain moment is as follows: Figure 13 As shown; until

[0100] S500, the next batch of grass material is fed into the compression chamber. The maximum contour position of the disc cam of the rotary camshaft 53 contacts the locking plate 51. The extended end of the locking plate 51, which is fixed on the locking plate seat 52, re-enters the rectangular groove of the upper locking slide seat 44. The large piston 4 and the small piston 3 of the compression mechanism re-combine to form a piston assembly, which moves backward in the compression chamber to push the grass material and the grass sheet formed in the first step to compact it. After the piston moves to the end of its stroke, it returns to the initial position. Then, the minimum contour position of the disc cam of the rotary camshaft 53 contacts the locking plate 51. The extended end of the locking plate 51, which is fixed on the locking plate seat 52, slides out of the rectangular groove of the upper locking slide seat 44. The large piston 4 and the small piston 3 separate again.

[0101] S600, S400 to S500 are repeated continuously to compress and shape the grass material. After the grass bale reaches the set length, it is discharged from the compression chamber. The compression mechanism operates continuously until the machine stops working.

[0102] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A compression mechanism for a square baler for straw materials, characterized in that, include: A crank mechanism includes two symmetrically arranged cranks, a crankshaft, a crankshaft end cap, and a bracket bearing seat. The small end of each crank is connected to the bracket bearing seat and the crankshaft end cap through the crankshaft. The bracket bearing seat is rotatable around the crankshaft. The connecting rod includes two U-shaped channel steel frames, a front end plate, a reinforcing plate, and a rear end plate, arranged symmetrically; The small piston includes two side push blocks, multiple intermediate push blocks, two upper crossbeams, a lower crossbeam, four connecting rod fixing sleeves, and four connecting rod connecting plates. The multiple intermediate push blocks are arranged in parallel at equal intervals, and the two side push blocks are arranged on both sides respectively. They are welded to the upper crossbeam and the lower crossbeam. Multiple rollers are installed on the side push blocks to reduce the resistance when the piston moves in the compression chamber. The connecting rod fixing sleeves pass through the holes of the connecting rod connecting plates and are fixed together, and then fixedly welded to the two intermediate push blocks in pairs. A large piston includes two side thrust blocks, multiple upper intermediate thrust blocks, multiple lower intermediate thrust blocks, two upper crossbeams, and a lower crossbeam. The multiple upper and lower intermediate thrust blocks are arranged in parallel at equal intervals, with the two side thrust blocks positioned on either side and fixed to the upper and lower crossbeams. Multiple rollers are mounted on the side thrust blocks to reduce resistance during piston movement within the compression chamber. The piston engagement / disengagement mechanism includes a rotary camshaft, a locking plate, a locking plate seat, two upper locking slide seats, four locking supports, two lower locking slide seats, and a tension spring. The lower locking slide seats and the locking supports are fixed to the middle of the upper crossbeam of the small piston, and the upper locking slide seats are fixed to the middle of the upper crossbeam of the large piston. The rotary camshaft is connected to the small piston through locking support holes. A disc-shaped cam on the rotary camshaft engages with the locking plate. When the maximum contour position of the disc-shaped cam contacts the locking plate, the protruding end of the locking plate, fixed to the locking plate seat, enters the rectangular groove of the upper locking slide seat. The large piston and the small piston are combined to form a whole, and reciprocate together with the movement of the crank and the connecting rod. When the minimum profile position of the disc cam contacts the locking plate, the protruding end of the locking plate, which is fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat. Then the large piston and the small piston separate, and only the small piston reciprocates with the movement of the crank and the connecting rod. The locking plate is fixed to the locking plate seat and embedded in the lower locking slide seat, and can slide in the slide formed by the combination of the lower locking slide seat and the upper locking slide seat. The tension spring ensures that the locking plate is in effective contact with the rotating camshaft.

2. The compression mechanism of the square baler as described in claim 1, characterized in that, It also includes two connecting rod connectors and connecting rod connector pins. One end of the connecting rod connector is fixed to the connecting rod, and the other end is connected to the connecting rod fixing sleeve through the connecting rod connector pin.

3. The compression mechanism of the square baler as described in claim 2, characterized in that, The connecting rod connects the crank to the small piston. One end of the connecting rod is fixed to the bracket bearing seat and connected to the crank, allowing it to rotate around the crank shaft. The other end is fixed to the connecting rod connector and connected to the small piston via the connecting rod connector pin, allowing it to rotate around the connecting rod connector pin.

4. A compression molding method, characterized in that, The compression molding of straw materials using the compression mechanism described in any one of claims 1-3 includes the following steps: S100. When compression begins, the large piston and the small piston of the compression mechanism are adjusted to the engagement position according to the working conditions, so that the maximum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate fixed on the locking plate seat enters the rectangular groove of the upper locking slide seat, and the large piston and the small piston are engaged to form a whole, which is the initial position. S200. If no grass material is fed into the compression chamber, the minimum profile position of the rotary camshaft disc cam contacts the locking plate, and the extended end of the locking plate fixed on the locking plate seat slides out of the rectangular groove of the upper locking slide seat. Then the large piston and the small piston separate, and the small piston reciprocates in the compression chamber under the drive of the crank and the connecting rod. until S300: The first batch of grass material is fed into the compression chamber. The maximum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate, fixed on the locking plate seat, enters the rectangular groove of the upper locking slide seat. The large piston and the small piston combine to form a piston assembly, which moves towards the rear of the compression chamber, pushing and compacting the grass material to form grass flakes. After the piston assembly moves to the end of its stroke, it returns to the initial position. Then, the minimum contour position of the rotary camshaft disc cam contacts the locking plate. The protruding end of the locking plate, fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat, and the large piston and the small piston separate. S400, the small piston, driven by the crank mechanism and the connecting rod, continues to reciprocate within the compression chamber to compact the straw and prevent it from springing back; until... S500, the next batch of forage is fed into the compression chamber. The maximum contour position of the rotary camshaft disc cam contacts the locking plate. The extended end of the locking plate, fixed on the locking plate seat, re-enters the rectangular groove of the upper locking slide seat. The large piston and the small piston of the compression mechanism re-combine to form a piston assembly, moving backward in the compression chamber to push the forage and the first-formed forage to compact. After the piston reaches the end of its stroke, it returns to its initial position. Then, the minimum contour position of the rotary camshaft disc cam contacts the locking plate. The extended end of the locking plate, fixed on the locking plate seat, slides out of the rectangular groove of the upper locking slide seat. The large piston and the small piston separate again. S600, S400 to S500 are repeated continuously to compress and shape the grass material. After the grass bale reaches the set length, it is discharged from the compression chamber. The compression mechanism operates continuously until the machine stops working.

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