Cleaning screen device and combine harvester

Abstract

The utility model relates to the field of harvester discloses a cleaning screen device and combine harvester. The cleaning screen device is installed in the combine harvester body along the front and back direction through the rear side mounting port of the combine harvester, the cleaning screen device includes the screen frame and the upper screen, the tail screen and the lower screen installed in the screen frame along the cleaning screen device installation direction, the upper screen front side is clamped in the screen frame front side through the first joint structure, and the upper screen rear side is detachably connected to the screen frame rear side through the first connecting structure, the tail screen front side is clamped in the upper screen rear side through the second joint structure, and the tail screen rear side is detachably connected to the screen frame rear side through the second connecting structure, the lower screen front side is clamped in the screen frame front side through the third joint structure, and the lower screen rear side is detachably connected to the screen frame rear side through the third connecting structure, and the first connecting structure, the second connecting structure and the third connecting structure are close by the mounting port when the cleaning screen device is installed in the body. The cleaning screen device makes the upper screen, the tail screen and the lower screen convenient and fast replacement, and the operation is simple, time-saving and laborsaving.

Description

Technical Field

[0001] This utility model relates to the field of combine harvester technology, specifically to a cleaning and screening device and a combine harvester having the same. Background Technology

[0002] A combine harvester is a machine that harvests crops in one operation. It can complete the processes of harvesting, threshing, separating stalks, and removing debris from crops in one go. It is a harvesting machine that directly obtains grains from the field and has the advantages of saving manpower and resources and improving agricultural productivity.

[0003] Combine harvesters include a cleaning system that separates and cleans the harvested crops. The core component of the cleaning system is the cleaning screen, which consists of a screen frame and upper, lower, and tail screens located inside the frame. The operating environment of the cleaning screen is relatively complex, which can easily lead to damage to the screening components such as the upper, lower, and tail screens. Furthermore, different crops require the replacement of screening components of corresponding specifications, thus necessitating frequent replacement of the screening components within the cleaning screen.

[0004] The existing method for replacing screening components involves removing the cleaning screen from the combine harvester and then replacing the upper, lower, and tail screens inside the cleaning screen. This replacement process is time-consuming, labor-intensive, and affects screening efficiency. Utility Model Content

[0005] The purpose of this invention is to overcome the problems of time-consuming and labor-intensive replacement of screening components in existing cleaning sieves, which affects screening efficiency. This invention provides a cleaning sieve device and a combine harvester. The cleaning sieve device allows for the replacement of screening components without disassembling the entire cleaning sieve device from the combine harvester. This makes the operation simple, time-saving, and labor-saving, improves the replacement efficiency of screening components, and enhances the adaptability of the cleaning sieve device to different crops.

[0006] To achieve the above objectives, this utility model provides a cleaning sieve device. The cleaning sieve device can be installed in the body of a combine harvester along the front-to-back direction via an installation port on the rear side of the combine harvester. The cleaning sieve device includes a sieve frame and an upper sieve, a tail sieve, and a lower sieve installed within the sieve frame along the installation direction of the cleaning sieve device. Specifically: the front side of the upper sieve is engaged with the front side of the sieve frame via a first engaging structure, and the rear side of the upper sieve is detachably connected to the rear side of the sieve frame via a first connecting structure; the front side of the tail sieve is engaged with the rear side of the upper sieve via a second engaging structure, and the rear side of the tail sieve is detachably connected to the rear side of the sieve frame via a second connecting structure; and the front side of the lower sieve is engaged with the front side of the sieve frame via a third engaging structure, and the rear side of the lower sieve is detachably connected to the rear side of the sieve frame via a third connecting structure. The first, second, and third connecting structures are all accessible through the installation port when the cleaning sieve device is installed in the body of the combine harvester.

[0007] In some embodiments, the screen frame includes a left side plate and a right side plate of the screen frame arranged opposite each other in the vertical direction of the installation direction, wherein: the left side plate and the right side plate of the screen frame are respectively provided with upper screen slides extending in the installation direction, the upper screen includes an upper screen left beam and an upper screen right beam arranged opposite each other in the vertical direction of the installation direction, the upper screen left beam and the upper screen right beam are respectively slidably engaged with two upper screen slides; and / or the left side plate and the right side plate of the screen frame are respectively provided with lower screen slides extending in the installation direction, the lower screen includes a lower screen left beam and a lower screen right beam arranged opposite each other in the vertical direction of the installation direction, the lower screen left beam and the lower screen right beam are respectively slidably engaged with two lower screen slides.

[0008] In some embodiments, the screen frame further includes an upper screen thrust beam connected between the left side plate and the right side plate of the screen frame, and the upper screen further includes an upper screen front crossbeam connecting the front ends of the upper screen left beam and the upper screen right beam, the upper screen front crossbeam being snapped onto the upper screen thrust beam by the first snap-fit ​​structure; and / or the upper screen left beam and the upper screen right beam are detachably connected to the left side plate and the right side plate of the screen frame respectively by the first connecting structure.

[0009] In some embodiments, the first snap-fit ​​structure includes a first groove extending along the length of the upper screen thrust beam on the rear side of the upper screen thrust beam, and the upper screen front crossbeam can be snapped into the first groove; and / or the first connection structure includes a bolt, an upper screen fixing seat respectively disposed on the left side plate of the screen frame and the right side plate of the screen frame, and a nut, the bolt passing through the connecting hole of the upper screen left side beam or the upper screen right side beam and the upper screen fixing seat and being threadedly connected to the nut.

[0010] In some embodiments, the upper screen further includes a rear crossbeam connecting the rear ends of the left and right beams of the upper screen, and the tail screen includes a front crossbeam disposed at the front end of the tail screen, the front crossbeam being snapped to the rear crossbeam of the upper screen via a second snap-fit ​​structure; and / or the tail screen further includes a left and right beam disposed opposite to each other, the left and right beams being detachably connected to the left and right plates of the screen frame via a second connecting structure, respectively.

[0011] In some embodiments, the second snap-fit ​​structure includes a second groove extending along the length of the upper screen rear crossbeam, located on the rear side of the upper screen rear crossbeam, and the tail screen front crossbeam can snap into the second groove; and / or, the second connection structure includes a bolt, a tail screen fixing seat respectively located on the left side plate of the screen frame and the right side plate of the screen frame, and a nut, wherein the bolt passes through the connecting hole of the tail screen left side beam or the tail screen right side beam and the tail screen fixing seat and is threadedly connected to the nut.

[0012] In some embodiments, the screen frame further includes a lower screen thrust beam connected between the left side plate and the right side plate of the screen frame, and the lower screen further includes a lower screen front crossbeam connecting the front ends of the lower screen left beam and the lower screen right beam, the lower screen front crossbeam being snapped onto the lower screen thrust beam by the third snap-fit ​​structure; and / or the lower screen further includes a lower screen rear crossbeam connecting the rear ends of the lower screen left beam and the lower screen right beam, and the screen frame further includes a lower screen cross brace connected between the left side plate and the right side plate of the screen frame, the lower screen rear crossbeam being detachably connected to the lower screen cross brace by the third connecting structure.

[0013] In some embodiments, the third snap-fit ​​structure includes a third groove extending along the length of the lower screen thrust beam on the rear side of the lower screen thrust beam, and the lower screen front crossbeam can snap into the third groove; and / or the third connection structure includes a bolt and a nut, the bolt passing through the connection hole of the lower screen rear crossbeam and the lower screen cross brace and being threadedly connected to the nut.

[0014] In some embodiments, the lower screen includes a lower screen weld and a lower screen frame disposed at the edge of the lower screen weld.

[0015] The second aspect of this utility model provides a combine harvester, the combine harvester including a body and a cleaning screen device as described in any of the above embodiments, the rear side of the body is provided with an installation port, and the cleaning screen device can be installed in the body of the machine body in the front-back direction through the installation port.

[0016] Using the above technical solution, the upper screen, tail screen, and lower screen are inserted into the screen frame from the mounting port of the combine harvester along the installation direction of the cleaning screen device. The front sides of the upper and lower screens are respectively engaged with the front side of the screen frame via a first and a third engaging structure. The rear sides of the upper and lower screens are detachably connected to the screen frame via a first and a third connecting structure, respectively. The front side of the tail screen is engaged with the rear side of the upper screen via a second engaging structure, and the rear side of the tail screen is detachably connected to the screen frame via a second connecting structure. This allows the upper screen, tail screen, and lower screen to be installed inside the screen frame. The first, second, and third connecting structures, which are close to the mounting port, are then... The upper, tail, and lower screens can be removed from the screen frame via the installation port and pulled out in the opposite direction to the installation direction of the cleaning screen device. The installation port allows for convenient and quick installation and removal of the upper, tail, and lower screens. When replacing the upper, tail, and lower screens, it is not necessary to remove the entire cleaning screen device from the combine harvester body before disassembling and installing the upper, tail, and lower screens. The installation and removal of the upper, tail, and lower screens can be performed directly through the installation port on the machine body. This simple and time-saving operation improves the efficiency of screen component replacement and enhances the adaptability of the cleaning screen device to different crops. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the cleaning and screening device disclosed in this utility model;

[0018] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the combine harvester body and the cleaning and screening device disclosed in this utility model;

[0021] Figure 5 This is an exploded view of the cleaning and screening device disclosed in this utility model;

[0022] Figure 6 This utility model discloses a cleaning and screening device with only the lower screen installed in the top view.

[0023] Figure 7 yes Figure 6 Sectional view at CC;

[0024] Figure 8 This is a schematic diagram of the lower screen of the cleaning and screening device disclosed in this utility model;

[0025] Figure 9 yes Figure 8 Sectional view at point DD;

[0026] Figure 10 This is a side view of the lower sieve disclosed in this utility model;

[0027] Figure 11 yes Figure 10 A magnified view of a section at point E in the middle;

[0028] Figure 12 yes Figure 10 A magnified view of a section at point F in the middle;

[0029] Figure 13 This is a schematic diagram of the upper screen thrust beam of the cleaning screen device disclosed in this utility model;

[0030] Figure 14 This is a side view of the upper screen thrust beam of the cleaning screen device disclosed in this utility model; and

[0031] Figure 15 This is a schematic diagram of the upper screen slide of the cleaning and screening device disclosed in this utility model.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Machine body; 11. Mounting port; 2. Screen frame; 21. Upper screen thrust beam; 211. First groove; 22. Left side plate of screen frame; 23. Right side plate of screen frame; 24. Upper screen slide; 241. Upper screen slide body; 242. Upper screen slide limiting plate; 25. Lower screen thrust beam; 26. Lower screen cross brace; 27. Lower screen slide; 271. Lower screen slide body; 272. Lower screen slide limiting plate; 28. Upper screen fixing seat; 29. 3. Upper screen; 31. Front crossbeam of upper screen; 32. Left side beam of upper screen; 33. Right side beam of upper screen; 34. Rear crossbeam of upper screen; 4. Tail screen; 41. Front crossbeam of tail screen; 42. Left side beam of tail screen; 43. Right side beam of tail screen; 5. Lower screen; 51. Lower screen frame; 511. Front crossbeam of lower screen; 512. Rear crossbeam of lower screen; 513. Left side beam of lower screen; 514. Right side beam of lower screen; 52. Welding of lower screen mesh; 6. Bolts. Detailed Implementation

[0034] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0035] To address the technical problem that existing methods for replacing screening components involve disassembling the cleaning screen from the combine harvester and then replacing the upper, lower, and tail screens, which is time-consuming, labor-intensive, and affects screening efficiency, this invention proposes a cleaning screen device.

[0036] See Figures 1 to 7 The cleaning screen device can be installed in the body 1 of the combine harvester through the mounting port 11 on the rear side of the combine harvester in a front-to-back direction. The cleaning screen device includes a screen frame 2 and an upper screen 3, a tail screen 4, and a lower screen 5 installed in the screen frame 2 along the installation direction of the cleaning screen device. Specifically: the front side of the upper screen 3 is snapped to the front side of the screen frame 2 via a first snap-fit ​​structure, and the rear side of the upper screen 3 is detachably connected to the rear side of the screen frame 2 via a first connecting structure; the front side of the tail screen 4 is snapped to the rear side of the upper screen 3 via a second snap-fit ​​structure, and the rear side of the tail screen 4 is detachably connected to the rear side of the screen frame 2 via a second connecting structure; the front side of the lower screen 5 is snapped to the front side of the screen frame 2 via a third snap-fit ​​structure, and the rear side of the lower screen 5 is detachably connected to the rear side of the screen frame 2 via a third connecting structure. The first, second, and third connecting structures are all accessible through the mounting port 11 when the cleaning screen device is installed in the body 1. Along the installation direction of the cleaning screen device (e.g., ... Figure 4 (In the direction indicated by the middle arrow) Insert the upper screen 3, tail screen 4, and lower screen 5 into the screen frame 2 through the mounting port 11 of the combine harvester. Attach the front sides of the upper screen 3 and lower screen 5 to the front side of the screen frame 2 via the first and third snap-fit ​​structures, respectively. The rear sides of the upper screen 3 and lower screen 5 are detachably connected to the screen frame 2 via the first and third connecting structures, respectively. The front side of the tail screen 4 is snapped to the rear side of the upper screen 3 via the second snap-fit ​​structure, and the rear side of the tail screen 4 is detachably connected to the screen frame 2 via the second connecting structure. This allows the upper screen 3, tail screen 4, and lower screen 5 to be installed inside the screen frame 2. Then, disassemble the first, second, and third connecting structures near the mounting port 11 through the mounting port 11, and insert the upper screen 3 and tail screen 5 in the opposite direction to the installation direction of the cleaning screen device. 4 and the lower sieve 5 are pulled out from the sieve frame 2; the upper sieve 3, tail sieve 4 and lower sieve 5 can be conveniently and quickly installed and disassembled through the installation port 11; when replacing the upper sieve 3, tail sieve 4 and lower sieve 5, it is not necessary to remove the entire cleaning sieve device from the body 1 of the combine harvester and then disassemble and install the upper sieve 3, tail sieve 4 and lower sieve 5 inside the cleaning sieve device. The upper sieve 3, tail sieve 4 and lower sieve 5 can be installed and disassembled directly from the installation port of the body 1. The operation is simple and saves time and effort, which can improve the replacement efficiency of screening components and improve the adaptability of the cleaning sieve device to different crops; through the installation port 11, not only can the rear side of the tail sieve 4 and the upper sieve 3 be inspected, but the opening of the sieve plates of the tail sieve 4 and the upper sieve 3 can also be adjusted.

[0037] To facilitate the entry and exit of the upper screen 3, tail screen 4 and lower screen 5 into or out of the screen frame 2, a channel is provided on the rear side of the screen frame 2 for the upper screen 3, tail screen 4 and lower screen 5 to be inserted and removed.

[0038] In order to enable the first, second, and third connecting structures to be quickly and easily installed and disassembled from the mounting port 11, the first, second, and third connecting structures are located on the rear side of the upper screen 3, the tail screen 4, and the lower screen 5.

[0039] To facilitate the installation and disassembly of the first, second, and third connecting structures, they are inclined toward the mounting opening 11 to make it easier for operators to install and disassemble them.

[0040] In some embodiments, the first connection structure, the second connection structure, and the third connection structure include bolts 6 that are inclined toward the mounting port 11.

[0041] See Figure 2 , Figure 5 and Figure 7 To ensure the stable movement of the upper screen 3 within the screen frame 2, the screen frame 2 includes a left side plate 22 and a right side plate 23 arranged perpendicularly to each other along the installation direction. The left side plate 22 and the right side plate 23 are each provided with an upper screen slide rail 24 extending along the installation direction. The upper screen 3 includes a left side beam 32 and a right side beam 33 arranged perpendicularly to each other along the installation direction. The left side beam 32 and the right side beam 33 are slidably engaged with the two upper screen slide rails 24. The upper screen slide rails 24 on the left side plate 22 and the right side plate 23 can slidably engage with the left side beam 32 and the right side beam 33, respectively, allowing the upper screen 3 to move relative to the screen frame 2 and providing stable support for the upper screen 3, thus ensuring the stability of its movement.

[0042] In some embodiments, the upper screen slide 24 includes a groove disposed on the side of the upper screen slide 24 away from the left side plate 22 or the right side plate 23 of the screen frame, and the left side beam 32 and the right side beam 33 of the upper screen are slidably inserted into the groove.

[0043] See Figure 15 In some embodiments, the upper screen slide 24 includes an upper screen slide body 241 disposed on the left side plate 22 and the right side plate 23 of the screen frame, and an upper screen slide limiting plate 242 disposed at the front end of the upper screen slide body 241. The upper screen slide body 241 is provided with a groove, and the upper screen slide limiting plate 242 is used to restrict the upper screen 3 from disengaging from the upper screen slide body 241 in the vertical direction. See also Figure 2 , Figure 5 and Figure 7To ensure the stable movement of the lower screen 5 within the screen frame 2, the left side plate 22 and the right side plate 23 of the screen frame are respectively provided with lower screen slides 27 extending along the installation direction. The lower screen 5 includes a left lower screen beam 513 and a right lower screen beam 514 arranged perpendicularly to each other along the installation direction. The left lower screen beam 513 and the right lower screen beam 514 are slidably engaged with the two lower screen slides 27. The lower screen slides 27 on the left side plate 22 and the right side plate 23 of the screen frame can slidably engage with the left lower screen beam 513 and the right lower screen beam 514 respectively, thereby enabling the lower screen 5 to move relative to the screen frame 2 and ensuring the stability of the movement of the lower screen 5.

[0044] In some embodiments, the lower screen slide 27 includes a groove disposed on the side of the lower screen slide 27 away from the left side plate 22 and the right side plate 23 of the screen frame, and the left side beam 513 and the right side beam 514 of the lower screen are slidably inserted into the groove.

[0045] See Figure 7 In some embodiments, the lower screen slide 27 includes a lower screen slide body 271 disposed on the left side plate 22 and the right side plate 23 of the screen frame, and a lower screen slide limiting plate 272 disposed at the front end of the lower screen slide body 271. The lower screen slide body 271 is provided with a groove, and the lower screen slide limiting plate 272 is used to restrict the lower screen 5 from disengaging from the lower screen slide body 271 in the vertical direction.

[0046] See Figure 2 To achieve the snap-fit ​​connection between the front side of the upper screen 3 and the front side of the screen frame 2, the screen frame 2 also includes an upper screen thrust beam 21 connecting the left side plate 22 and the right side plate 23 of the screen frame. The upper screen 3 also includes an upper screen front crossbeam 31 connecting the front ends of the upper screen left side beam 32 and the upper screen right side beam 33. The upper screen front crossbeam 31 is snap-fitted to the upper screen thrust beam 21 through a first snap-fit ​​structure. The upper screen front crossbeam 31 is snap-fitted to the upper screen thrust beam 21 through the first snap-fit ​​structure, so that the upper screen front crossbeam 31 is fixed on the upper screen thrust beam 21, ensuring the stability of the front position of the upper screen 3.

[0047] See Figure 2 , Figure 13 and Figure 14 In some embodiments, the first engaging structure includes a first groove 211 extending along the length of the upper screen thrust beam 21 and disposed on the rear side of the upper screen thrust beam 21, and the upper screen front crossbeam 31 can engage in the first groove 211. The first groove 211 of the upper screen thrust beam 21 enables the upper screen front crossbeam 31 to engage with the upper screen thrust beam 21, ensuring the fixed connection between the front side of the upper screen 3 and the screen frame 2.

[0048] In order to facilitate the smooth insertion of the upper screen front crossbeam 31 into the first groove 211 without shaking, the width of the first groove 211 gradually increases in the direction away from the upper screen thrust beam 21.

[0049] It should be noted that the above are examples of specific methods of the first snap-fit ​​structure described in this utility model, and should not be construed as limiting the specific methods of the first snap-fit ​​structure described in this utility model. Any structure that can achieve the snap-fit ​​connection between the upper screen 3 and the screen frame 2 will fall within the protection scope of this utility model.

[0050] In some embodiments, the first snap-fit ​​structure is disposed on the rear side of the upper screen thrust beam 21 and is provided with a groove extending along the length direction of the upper screen thrust beam 21, and the upper screen front crossbeam 31 can be snapped into the groove.

[0051] In some embodiments, the first snap-fit ​​structure includes a slot disposed on the rear side of the upper screen thrust beam 21 and an elastic clip disposed on the front side of the upper screen front crossbeam 31. The elastic clip can snap into the slot, and the width of the slot and the elastic clip gradually increases in the direction away from the upper screen thrust beam 21.

[0052] In some embodiments, the slot and the resilient clip have a V-shaped cross-section along the mounting direction.

[0053] To ensure the stability of the engagement between the slot and the elastic clip, the width of the slot is smaller than the width of the elastic clip. When the elastic clip engages with the slot, it applies a spring force to the slot to ensure the stability of the engagement with the upper screen front crossbeam 31.

[0054] See Figure 3 and Figure 5 In order to ensure a stable connection between the rear side of the upper screen 3 and the screen frame 2, the left side beam 32 and the right side beam 33 of the upper screen are detachably connected to the left side plate 22 and the right side plate 23 of the screen frame through the first connection structure, respectively.

[0055] See Figure 3 To achieve a detachable connection between the left and right upper screen beams 32 and the left and right screen frame plates 22 and 23, the first connection structure includes bolts 6, upper screen fixing seats 28 respectively located on the left and right screen frame plates 22 and 23, and nuts. Bolts 6 pass through the connecting holes of the left or right upper screen beam 32 and the upper screen fixing seat 28, and are threadedly connected to the nuts. By sequentially passing through the connecting holes in the left or right upper screen beam 32 and the upper screen fixing seat 28, and then through the connecting holes in the upper screen fixing seat 28, the rear side of the upper screen 3 can be detachably connected to the screen frame 2.

[0056] It should be noted that the above are examples of specific methods of the first connecting structure described in this utility model, and should not be construed as limiting the specific methods of the first connecting structure described in this utility model. Any structure that can achieve a detachable connection between the rear side of the upper screen 3 and the screen frame 2 will fall within the protection scope of this utility model.

[0057] In some embodiments, the first connection structure is a connecting pin and an upper screen fixing seat 28 respectively disposed on the left side plate 22 and the right side plate 23 of the screen frame. The connecting pin is used to detachably connect the left side beam 32 or the right side beam 33 of the upper screen to the upper screen fixing seat 28.

[0058] In some embodiments, the upper screen fixing seat 28 is detachably connected to the left side plate 22 and the right side plate 23 of the screen frame.

[0059] To enable a detachable connection between the upper screen fixing seat 28 and the left side plate 22 and the right side plate 23 of the screen frame, bolts 6 pass through the upper screen fixing seat 28 and the left side plate 22 or the right side plate 23 of the screen frame and are threadedly connected to nuts.

[0060] In some embodiments, the upper screen fixing seat 28 includes a horizontal plate and a vertical plate fixedly connected at an angle. The vertical plate is detachably connected to the left side plate 22 or the right side plate 23 of the screen frame, and the horizontal plate is detachably connected to the left side beam 32 or the right side beam 33 of the upper screen.

[0061] See Figure 1 , Figure 3 and Figure 5 In some embodiments, the upper screen 3 further includes a rear crossbeam 34 connecting the rear ends of the left side beam 32 and the right side beam 33 of the upper screen. The tail screen 4 includes a front crossbeam 41 disposed at the front end of the tail screen 4. The front crossbeam 41 is snapped onto the rear crossbeam 34 of the upper screen via a second snap-fit ​​structure. The snap-fit ​​structure allows the front crossbeam 41 to be fixedly installed on the rear crossbeam 34 of the upper screen, ensuring the stability of the front position of the tail screen 4 and enabling the front crossbeam 41 to be quickly separated from the rear crossbeam 34 of the upper screen, thereby facilitating the installation and disassembly of the front crossbeam 41 and the rear crossbeam 34 of the upper screen.

[0062] See Figure 3 and Figure 5 In some embodiments, the second snap-fit ​​structure includes a second groove extending along the length of the upper rear crossbeam 34, located on the rear side of the upper screen rear crossbeam 34, into which the tail screen front crossbeam 41 can snap-fit. The tail screen front crossbeam 41 is inserted into the second groove, achieving snap-fit ​​between the tail screen front crossbeam 41 and the upper screen rear crossbeam 34, thereby achieving a fixed connection between the front side of the tail screen 4 and the screen frame 2.

[0063] In order to ensure that the front crossbeam 41 of the tail screen can be smoothly engaged in the second groove without shaking, the width of the second groove gradually increases in the direction away from the rear crossbeam 34 of the upper screen.

[0064] It should be noted that the above are examples of specific methods of the second snap-fit ​​structure described in this utility model, and should not be construed as limiting the specific methods of the second snap-fit ​​structure described in this utility model. Any structure that can achieve snap-fit ​​between the front side of the tail screen 4 and the screen frame 2 will fall within the protection scope of this utility model.

[0065] In some embodiments, the second snap-fit ​​structure is disposed on the rear side of the upper screen rear crossbeam 34 and is provided with a groove extending along the length direction of the upper screen rear crossbeam 34, and the tail screen front crossbeam 41 can be snapped into the groove.

[0066] To ensure a stable connection between the rear side of the tail screen 4 and the screen frame 2, the tail screen 4 also includes a left tail screen beam 42 and a right tail screen beam 43 arranged opposite to each other. The left tail screen beam 42 and the right tail screen beam 43 are detachably connected to the left side plate 22 and the right side plate 23 of the screen frame, respectively, through a second connecting structure. The second connecting structure allows the rear side of the tail screen 4 to be detachably connected to the screen frame 2, thereby realizing the installation and removal of the rear side of the tail screen 4 from the screen frame 2 and improving the replacement efficiency of the tail screen 4. The connection between the left tail screen beam 42 and the right tail screen beam 43 and the left side plate 22 and the right side plate 23 of the screen frame, respectively, makes the connection between the rear side of the tail screen 4 and the screen frame 2 more stable.

[0067] In some embodiments, the second connection structure includes a bolt 6, a tail screen fixing seat 29 respectively disposed on the left side plate 22 and the right side plate 23 of the screen frame, and a nut. The bolt 6 passes through the connecting holes of the left side beam 42 or the right side beam 43 of the tail screen and the tail screen fixing seat 29 and is threadedly connected to the nut. The engagement between the bolt 6, the connecting holes of the left side beam 42 or the right side beam 43 of the tail screen, the connecting holes of the tail screen fixing seat 29, and the nut allows the rear side of the tail screen 4 to be detachably connected to the screen frame 2.

[0068] It should be noted that the above are examples of specific methods of the second connection structure described in this utility model, and should not be construed as limiting the specific methods of the second connection structure described in this utility model. Any structure that enables a detachable connection between the rear side of the tail screen 4 and the screen frame 2 will fall within the protection scope of this utility model.

[0069] In some embodiments, the second connection structure is a connecting pin and a tail screen fixing seat 29 respectively disposed on the left side plate 22 and the right side plate 23 of the screen frame. The connecting pin is used to detachably connect the left side beam 42 or the right side beam 43 of the tail screen to the tail screen fixing seat 29.

[0070] In some embodiments, the tail screen fixing seat 29 is detachably connected to the left side plate 22 and the right side plate 23 of the screen frame.

[0071] In order to achieve a detachable connection between the tail screen fixing seat 29 and the left side plate 22 and the right side plate 23 of the screen frame, the bolt 6 passes through the tail screen fixing seat 29 and the left side plate 22 or the right side plate 23 of the screen frame and is threadedly connected to the nut.

[0072] In some embodiments, the tail screen fixing base 29 includes a horizontal plate and a vertical plate fixedly connected at an angle. The vertical plate is detachably connected to the left side plate 22 or the right side plate 23 of the screen frame, and the horizontal plate is detachably connected to the left side beam 42 or the right side beam 43 of the tail screen.

[0073] See Figure 2 and Figure 5 To achieve the snap-fit ​​connection between the front side of the lower screen 5 and the front side of the screen frame 2, the screen frame 2 also includes a lower screen thrust beam 25 connected between the left side plate 22 and the right side plate 23 of the screen frame. The lower screen 5 also includes a lower screen front crossbeam 511 connecting the front ends of the lower screen left side beam 513 and the lower screen right side beam 514. The lower screen front crossbeam 511 is snapped onto the lower screen thrust beam 25 through a third snap-fit ​​structure. The lower screen front crossbeam 511 is snapped onto the lower screen thrust beam 25 through the third snap-fit ​​structure, so that the lower screen front crossbeam 511 can be fixedly installed on the lower screen thrust beam 25, ensuring the stability of the front position of the lower screen 5, and enabling the rapid separation of the lower screen front crossbeam 511 from the lower screen thrust beam 25, so as to realize the installation and disassembly of the lower screen front crossbeam 511 and the lower screen thrust beam 25.

[0074] See Figure 1 and Figure 2 In some embodiments, the third snap-fit ​​structure includes a third groove extending along the length of the lower screen thrust beam 25 and disposed on the rear side of the lower screen thrust beam 25. The lower screen front crossbeam 511 can snap into the third groove. The lower screen front crossbeam 511 is inserted into the third groove, thereby achieving the snap-fit ​​between the lower screen front crossbeam 511 and the lower screen thrust beam 25, and thus achieving a fixed connection between the front side of the lower screen 5 and the front side of the screen frame 2.

[0075] In order to ensure that the lower screen front crossbeam 511 can be smoothly engaged in the third groove without shaking, the width of the third groove gradually increases in the direction away from the lower screen thrust beam 25.

[0076] It should be noted that the above are examples of specific methods of the third snap-fit ​​structure described in this utility model, and should not be construed as limiting the specific methods of the third snap-fit ​​structure described in this utility model. Any structure that can achieve snap-fit ​​between the front side of the lower sieve 5 and the front side of the sieve frame 2 will fall within the protection scope of this utility model.

[0077] See Figure 1 , Figure 3To achieve a detachable connection between the rear side of the lower screen 5 and the screen frame 2, the lower screen 5 also includes a rear crossbeam 512 connecting the rear ends of the left side beam 513 and the right side beam 514 of the lower screen. The screen frame 2 also includes a lower screen cross brace 26 connecting the left side plate 22 and the right side plate 23 of the screen frame. The rear crossbeam 512 is detachably connected to the lower screen cross brace 26 via a third connecting structure. The lower screen cross brace 26 connecting the left side plate 22 and the right side plate 23 of the screen frame can stably connect the rear crossbeam 512 to the screen frame 2, and the third connecting structure makes the installation and disassembly of the rear crossbeam 512 and the lower screen cross brace 26 more convenient and quick.

[0078] In some embodiments, the third connection structure includes a bolt 6 and a nut. The bolt 6 passes through the connecting holes of the lower screen crossbeam 512 and the lower screen cross brace 26 and is threadedly connected to the nut. The engagement of the bolt 6, the connecting holes of the lower screen crossbeam 512 and the lower screen cross brace 26, and the nut allows the lower screen crossbeam 512 to be detachably connected to the lower screen cross brace 26, thereby facilitating the installation and removal of the lower screen crossbeam 512 and the lower screen cross brace 26.

[0079] In some embodiments, the third connection structure includes a bolt 6 and a threaded hole disposed in the lower screen cross brace 26. The bolt 6 passes through the lower screen rear cross beam 512 and is threadedly connected to the threaded hole of the lower screen cross brace 26.

[0080] See Figures 8 to 12 To improve the overall strength of the lower screen 5, the lower screen 5 includes a lower screen weld 52 and a lower screen frame 51 disposed at the edge of the lower screen weld 52. The lower screen frame 51 enhances the strength of the lower screen weld 52 by being installed at the edge of the lower screen weld 52, and by providing the lower screen frame 51 at the edge of the lower screen weld 52, the lower screen 5 can slide on the lower screen slide 27 to realize the pulling of the lower screen 5 within the screen frame 2.

[0081] In some embodiments, the assembly position of the lower screen frame 51 and the lower screen weld 52 can be that the lower screen weld 52 is located on the upper side, middle side or lower side of the lower screen frame 51.

[0082] In order to enable the installation and disassembly of the lower screen frame 51 and the lower screen weld 52, the lower screen frame 51 and the lower screen weld 52 are detachably connected.

[0083] In some embodiments, the lower screen frame 51 and the lower screen weld 52 are detachably connected by bolts 6 and nuts.

[0084] It should be noted that the above are examples of specific methods for the detachable connection of the lower screen frame 51 and the lower screen mesh 52 as described in this utility model, and should not be construed as limiting the specific methods for the detachable connection of the lower screen frame 51 and the lower screen mesh 52 as described in this utility model. Any structure that can achieve a detachable connection of the lower screen frame 51 and the lower screen mesh 52 will fall within the protection scope of this utility model.

[0085] This utility model also provides a combine harvester. See also Figure 4 The combine harvester includes a body 1 and a cleaning screen device according to any of the above-mentioned embodiments. An installation port 11 is provided on the rear side of the body 1, through which the cleaning screen device can be installed in the body 1 in the front-to-back direction. The cleaning screen device can be installed or removed from the body 1 in the front-to-back direction through the installation port 11. Furthermore, through this installation port 11, the upper screen 3, the tail screen 4, and the lower screen 5 can be installed in or removed from the screen frame 2 of the cleaning screen device, enabling quick and convenient replacement of the upper screen 3, the tail screen 4, and the lower screen 5.

[0086] The method for replacing the upper screen 3, tail screen 4, and lower screen 5 of the cleaning screening device proposed in this utility model is as follows:

[0087] The lower screen 5 is placed on the lower screen slide 27 along the installation direction of the cleaning screen device through the mounting port 11. The lower screen front crossbeam 511 on the front side of the lower screen 5 is then connected to the lower screen thrust beam 25 through the third snap-fit ​​structure along the length direction of the lower screen slide 27. The lower screen rear crossbeam 512 is installed on the lower screen cross brace 26 of the screen frame 2 through the third connecting structure. The upper screen 3 is placed on the upper screen slide 24 along the installation direction of the cleaning screen device through the mounting port 11. The upper screen front crossbeam 31 of the upper screen 3 is then connected to the lower screen thrust beam 25 through the first snap-fit ​​structure along the length direction of the upper screen slide 24. The upper screen is inserted into the upper screen thrust beam 21, and then the upper screen left side beam 32 and upper screen right side beam 33 are installed on the screen frame left side plate 22 and screen frame right side plate 23 through the first connecting structure; the tail screen 4 is placed into the screen frame 2 along the installation direction of the cleaning screen device through the installation port 11, so that the tail screen front crossbeam 41 of the tail screen 4 is inserted into the upper screen rear crossbeam 34 through the second snap-fit ​​structure, and the tail screen left side beam 42 and tail screen right side beam 43 are installed on the screen frame left side plate 22 and screen frame right side plate 23 through the second connecting structure; the installation of the lower screen 5, upper screen 3 and tail screen 4 is realized in sequence;

[0088] The second connecting structure of the left side beam 42 and the right side beam 43 of the tail screen, which are installed on the left side plate 22 and the right side plate 23 of the screen frame, is disassembled through the mounting port 11. The front crossbeam 41 of the tail screen is then pulled out from the rear crossbeam 34 of the upper screen along the length direction of the left side beam 42 and the right side beam 43 of the tail screen. The first connecting structure of the left side beam 32 and the right side beam 33 of the upper screen, which are installed on the left side plate 22 and the right side plate 23 of the screen frame, is disassembled through the mounting port 11. The front crossbeam 31 of the upper screen is then pulled out from the thrust beam 21 of the upper screen along the length direction of the upper screen slide 24. The third connecting structure of the rear crossbeam 512 of the lower screen, which is installed on the cross brace 26 of the lower screen, is disassembled through the mounting port 11. The front crossbeam 511 of the lower screen is then pulled out from the thrust beam 25 of the lower screen along the length direction of the lower screen slide 27. Thus, the tail screen 4, the upper screen 3, and the lower screen 5 are disassembled.

[0089] Depending on the degree of damage to the upper sieve 3, the tail sieve 4, and the lower sieve 5, and the different crops to be screened, the upper sieve 3, the tail sieve 4, or the lower sieve 5 may be replaced to meet the screening function of the cleaning and screening device.

[0090] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. This includes combining various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A cleaning and screening device, characterized in that, The cleaning screen device can be installed in the body (1) of the combine harvester through the mounting port (11) on the rear side of the combine harvester in the front-to-back direction. The cleaning screen device includes a screen frame (2) and an upper screen (3), a tail screen (4) and a lower screen (5) installed in the screen frame (2) along the installation direction of the cleaning screen device, wherein: The front side of the upper sieve (3) is snapped to the front side of the sieve frame (2) through a first snap-fit ​​structure, and the rear side of the upper sieve (3) is detachably connected to the rear side of the sieve frame (2) through a first connecting structure. The front side of the tail screen (4) is snapped to the rear side of the upper screen (3) via a second snap-fit ​​structure, and the rear side of the tail screen (4) is detachably connected to the rear side of the screen frame (2) via a second connecting structure; and The front side of the lower sieve (5) is snapped to the front side of the sieve frame (2) through a third snap-fit ​​structure, and the rear side of the lower sieve (5) is detachably connected to the rear side of the sieve frame (2) through a third connecting structure. The first connection structure, the second connection structure and the third connection structure are configured to be accessible through the mounting port (11) when the cleaning screen device is installed inside the machine body (1).

2. The cleaning and screening device according to claim 1, characterized in that, The screen frame (2) includes a left side plate (22) and a right side plate (23) of the screen frame arranged opposite each other in a direction perpendicular to the installation direction, wherein: The left side plate (22) and the right side plate (23) of the screen frame are respectively provided with upper screen slides (24) extending along the installation direction. The upper screen (3) includes an upper screen left side beam (32) and an upper screen right side beam (33) arranged opposite each other in the vertical direction of the installation direction. The upper screen left side beam (32) and the upper screen right side beam (33) are respectively slidably engaged with the two upper screen slides (24); and / or The left side plate (22) and the right side plate (23) of the screen frame are respectively provided with a lower screen slide (27) extending along the installation direction. The lower screen (5) includes a lower screen left side beam (513) and a lower screen right side beam (514) arranged opposite each other in the vertical direction of the installation direction. The lower screen left side beam (513) and the lower screen right side beam (514) are respectively slidably engaged with the two lower screen slides (27).

3. The cleaning and screening device according to claim 2, characterized in that, The screen frame (2) further includes an upper screen thrust beam (21) connecting the left side plate (22) and the right side plate (23) of the screen frame. The upper screen (3) further includes an upper screen front crossbeam (31) connecting the front ends of the upper screen left side beam (32) and the upper screen right side beam (33). The upper screen front crossbeam (31) is snapped onto the upper screen thrust beam (21) by the first snap-fit ​​structure; and / or The left side beam (32) and the right side beam (33) of the upper screen are detachably connected to the left side plate (22) and the right side plate (23) of the screen frame respectively through the first connecting structure.

4. The cleaning and screening device according to claim 3, characterized in that, The first snap-fit ​​structure includes a first groove (211) extending along the length of the upper screen thrust beam (21) on the rear side of the upper screen thrust beam (21), and the upper screen front crossbeam (31) can snap into the first groove (211); and / or The first connection structure includes a bolt (6), an upper screen fixing seat (28) respectively disposed on the left side plate (22) and the right side plate (23) of the screen frame, and a nut. The bolt (6) passes through the connecting hole of the left side beam (32) or the right side beam (33) of the upper screen and the upper screen fixing seat (28) and is threadedly connected to the nut.

5. The cleaning and screening device according to claim 2, characterized in that, The upper screen (3) further includes an upper screen rear crossbeam (34) connecting the rear ends of the upper screen left side beam (32) and the upper screen right side beam (33), and the tail screen (4) includes a tail screen front crossbeam (41) disposed at the front end of the tail screen (4), the tail screen front crossbeam (41) being snapped to the upper screen rear crossbeam (34) by a second snap-fit ​​structure; and / or The tail screen (4) also includes a tail screen left side beam (42) and a tail screen right side beam (43) arranged opposite to each other. The tail screen left side beam (42) and the tail screen right side beam (43) are detachably connected to the screen frame left side plate (22) and the screen frame right side plate (23) respectively through a second connecting structure.

6. The cleaning and screening device according to claim 5, characterized in that, The second snap-fit ​​structure includes a second groove extending along the length of the upper rear crossbeam (34) located on the rear side of the upper screen, wherein the tail screen front crossbeam (41) can snap into the second groove; and / or The second connection structure includes a bolt (6), a tail screen fixing seat (29) respectively disposed on the left side plate (22) and the right side plate (23) of the screen frame, and a nut. The bolt (6) passes through the connecting hole of the left side beam (42) or the right side beam (43) of the tail screen and the tail screen fixing seat (29) and is threadedly connected to the nut.

7. The cleaning and screening device according to claim 2, characterized in that, The screen frame (2) further includes a lower screen thrust beam (25) connecting the left side plate (22) and the right side plate (23) of the screen frame. The lower screen (5) further includes a lower screen front crossbeam (511) connecting the front ends of the lower screen left side beam (513) and the lower screen right side beam (514). The lower screen front crossbeam (511) is snapped onto the lower screen thrust beam (25) by the third snap-fit ​​structure; and / or The lower screen (5) also includes a lower screen rear crossbeam (512) connecting the rear ends of the lower screen left side beam (513) and the lower screen right side beam (514). The screen frame (2) also includes a lower screen cross brace (26) connecting the screen frame left side plate (22) and the screen frame right side plate (23). The lower screen rear crossbeam (512) is detachably connected to the lower screen cross brace (26) through the third connecting structure.

8. The cleaning and screening device according to claim 7, characterized in that, The third snap-fit ​​structure includes a third groove extending along the length of the lower screen thrust beam (25) on the rear side of the lower screen thrust beam (25), and the lower screen front crossbeam (511) can snap into the third groove; and / or The third connection structure includes a bolt (6) and a nut. The bolt (6) passes through the connection holes of the lower screen rear crossbeam (512) and the lower screen cross brace (26) and is threadedly connected to the nut.

9. The cleaning and screening device according to any one of claims 1-8, characterized in that, The lower screen (5) includes a lower screen weld (52) and a lower screen frame (51) disposed at the edge of the lower screen weld (52).

10. A combine harvester, characterized in that, The combine harvester includes a body (1) and a cleaning screen device as described in any one of claims 1-9. The body (1) has an installation port (11) on its rear side, and the cleaning screen device can be installed in the body (1) in the front-rear direction through the installation port (11).

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