Header oil cylinder and harvester

Abstract

The utility model relates to the technical field of harvesters, in particular to a header oil cylinder and a harvester, the header oil cylinder comprises a guide sleeve and a piston rod arranged on the guide sleeve in a penetrating mode, a hinge rod is arranged at the end of the piston rod, and the hinge rod is used for being hinged to a lug plate on a header gap bridge; a protection structure is arranged on the outer side of the piston rod and used for preventing silt from adhering to the piston rod. The protection structure can axially move along the guide sleeve along with the piston rod, and after the piston rod extends out of the protection structure and exceeds the guide sleeve, a groove is formed among the protection barrel, the piston rod and the guide sleeve; the safety device further comprises a safety clamp, the safety clamp comprises a clamping piece, and the clamping piece is detachably arranged in the groove and used for limiting the return stroke of the piston rod; on the basis that the anti-falling function is guaranteed, effective protection can be provided for the piston rod of the header oil cylinder, damage and pollution caused by impurities such as clay are reduced, and therefore the overall reliability of the harvester is improved, and the service life of the harvester is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of harvester technology, and more specifically, to a header cylinder and a harvester. Background Technology

[0002] In existing technology, harvesters, as important agricultural machinery, play a vital role in agricultural production. The harvester's header, driven by a hydraulic system, lifts and lowers itself to adapt to different working environments and operational needs. However, in actual use, hydraulic system failures pose significant safety hazards to operators. In particular, a sudden failure of the header lifting hydraulic system could cause the header to fall unexpectedly, posing a considerable threat to personnel performing maintenance. Utility Model Content

[0003] The purpose of this utility model is to provide a cutting table cylinder that can solve the problem of the cutting table falling unexpectedly due to the sudden failure of the hydraulic system in the prior art, thereby ensuring the personal safety of maintenance personnel.

[0004] Another objective of this invention is to provide a harvester that, while ensuring the anti-fall function, also provides effective protection for the piston rod of the header cylinder, reducing damage and contamination caused by clay and other impurities, thereby improving the overall reliability and service life of the harvester.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A cutting table cylinder includes a guide sleeve and a piston rod passing through the guide sleeve. The end of the piston rod is provided with a hinge rod for hinged connection with an ear plate on the cutting table bridge. A protective structure is provided on the outside of the piston rod for preventing mud and sand from adhering to the piston rod.

[0007] The protective structure can move axially along the guide sleeve following the piston rod. After the piston rod extends beyond the guide sleeve, a groove is formed between the protective cylinder, the piston rod, and the guide sleeve.

[0008] It also includes a safety card, which includes a card element that is detachably disposed in the groove for limiting the return stroke of the piston rod.

[0009] Furthermore, the hinge rod has a first through hole, and the ear plate of the cutting table bridge has a second through hole;

[0010] The protective structure adopts a protective cylinder, and a sealing part is provided on one end of the protective cylinder near the hinge rod. A contour hole is opened on the sealing part. The shape and size of the contour hole are the same as those of the cross-section of the hinge rod. The hinge rod passes through the contour hole and there is no gap between them.

[0011] At least one connecting lug is fixedly provided on the end face of the sealing part, and the connecting lug is located on one side or opposite sides of the hinge rod. The free end of the connecting lug is provided with a hinge hole, and a pin assembly is installed in the first through hole, the second through hole and the hinge hole.

[0012] Furthermore, the cross-section of the hinge rod is waist-shaped, and the outer surface of the hinge rod has two parallel planar portions;

[0013] Two connecting lugs are fixedly provided on the end face of the sealing part, and the surfaces of the two connecting lugs are respectively arranged parallel to the planar part.

[0014] Furthermore, an outer edge is provided on the outer side of the protective cylinder at the end away from the hinge rod, a third through hole is provided on the outer edge, and a fourth through hole is provided on the clip;

[0015] When the card is installed in the groove, quick-release pins are installed in the third and fourth through holes, and the quick-release pins are used to connect the card and the protective cylinder.

[0016] Furthermore, a flexible contact portion is provided on the inner side of the card, through which the card makes flexible contact with the piston rod.

[0017] Furthermore, the card includes a connecting part, a middle part, and an abutting part connected in sequence;

[0018] The fourth through hole is provided on the connecting part to connect with the protective cylinder, the abutting part is used to abut against the end face of the guide sleeve, and the flexible contact part is provided on the inner side of the middle part.

[0019] Furthermore, the connecting part and the abutting part are both semi-circular annular plate structures, the middle part is a semi-circular cylindrical structure, and the central axes of the connecting part, the middle part and the abutting part are respectively parallel to the central axis of the piston rod.

[0020] Furthermore, the flexible contact portion is made of rubber or nylon material.

[0021] Furthermore, the clamp is a movable sleeve structure, and the clamp is composed of two semi-circular cylindrical bodies spliced ​​together;

[0022] The two semi-circular cylinders are fastened together by buckles, or the two semi-circular cylinders are bound together by ropes.

[0023] A harvester includes a header, a header bridge, and a frame. The header is connected to the frame via the header bridge. The harvester also includes a header cylinder. The bottom of the header cylinder is mounted on the frame. The hinge rod of the piston rod of the header cylinder is hinged to an ear plate on the header bridge. The header cylinder is used to raise or lower the header.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] When overhauling the cutting table, the piston rod of the hydraulic cylinder is extended to raise the cutting table, revealing the groove between the protective cylinder and the guide sleeve. At this time, the clamp is installed in the groove, and the clamp is located between the protective cylinder and the guide sleeve. The clamp blocks the protective cylinder, preventing it from sliding down and thus preventing the cutting table from falling. This solves the problem of the cutting table falling unexpectedly due to the sudden failure of the hydraulic system in the existing technology, and thus ensures the personal safety of maintenance personnel.

[0026] In addition, a protective structure is provided on the outside of the piston rod to prevent clay and other impurities from adhering to the piston rod during harvesting, and to prevent sand and gravel bounced up from sandy harvesting surfaces from hitting the piston rod. This protects the piston rod. During the process of the piston rod retracting into the guide sleeve, it will not cause unavoidable damage to the header cylinder itself, nor will it contaminate the entire hydraulic system or cause further secondary failures. This reduces the maintenance cost and time of the equipment and increases the service life of the header cylinder and the harvester. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional structural diagram of the hydraulic cylinder piston rod of this utility model after it has extended and the clamping device has been installed.

[0029] Figure 2 This is a schematic diagram of the structure of the piston rod of the cutting table cylinder when it retracts.

[0030] In the picture:

[0031] 1-Piston rod; 101-Hinged rod; 2-Guide sleeve;

[0032] 3-Protective cylinder; 301-Sealing part; 302-Shaped hole; 303-Outer edge;

[0033] 4-groove;

[0034] 501 - Connecting part; 502 - Middle part; 503 - Abutting part;

[0035] 6-Flexible contact part; 7-Pin assembly; 8-Quick-connect pin;

[0036] 9-Connecting ear plate. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] Example 1

[0045] Reference Figures 1-2 This embodiment provides a cutting table cylinder, which is a hydraulic cylinder used for lifting and lowering the cutting table. The cutting table cylinder includes a guide sleeve 2 and a piston rod 1 (which belongs to the prior art) passing through the guide sleeve 2. The end of the piston rod 1 is provided with a hinge rod 101, which is used to hinge with the ear plate on the cutting table bridge. It should be noted that since this solution focuses on the innovation of the extended end of the piston rod 1 of the cutting table cylinder, the other basic components of the cylinder will not be described in detail.

[0046] It also includes a safety clip, which comprises a clip detachably disposed in the groove 4 for limiting the return stroke of the piston rod 1. The clip can be installed after the piston rod 1 extends out and exposes the groove 4; generally, the clip is installed after the piston rod 1 is fully extended.

[0047] It should be noted that in the field of agricultural machinery, the "bridge" refers to the part that connects the header and the machine body (frame). Its main function is to transmit power and connect various working parts on the header.

[0048] Specifically, between the header (the part of the harvester responsible for cutting crops) and the main body of the machine, there is a structure for transmitting power and coordinating the movement of the header; this part is often referred to as the "bridge." It typically includes transmission devices such as pulleys and chains, which transmit the engine's power to the blades and other components on the header, enabling them to operate properly.

[0049] During maintenance of the cutting table, the piston rod 1 of the cutting table cylinder extends to raise the cutting table, revealing the groove 4 between the protective cylinder 3 and the guide sleeve 2. After the piston rod 1 is fully extended, the locking device is installed in the groove 4, positioned between the protective cylinder 3 and the guide sleeve 2. The quick-release pin 8 then secures the locking device to the protective cylinder 3. Even if the protective cylinder 3 slides down, the lower part of the locking device abuts against the end face of the guide sleeve 2, thus preventing the protective cylinder 3 from sliding further and preventing the cutting table from falling. This safety locking design solves the problem of accidental cutting table falls due to sudden hydraulic system failure in existing technologies, ensuring the safety of maintenance personnel. The locking device can be removed when maintenance is complete or when the cutting table needs to be lowered.

[0050] Example 2

[0051] In existing technologies, if the hydraulic system for lifting the cutting platform suddenly fails, the cutting platform may fall unexpectedly, which undoubtedly poses a huge threat to personnel performing maintenance.

[0052] To address this risk, major harvester manufacturers have designed safety catch devices for the header cylinders to prevent the header from suddenly falling in the event of hydraulic system failure, thus protecting the safety of maintenance personnel. However, besides sudden hydraulic system failure, another common failure mode of the header cylinder is the adhesion of impurities such as clay to the piston rod 1. These impurities, once crusted over on the surface of piston rod 1, are difficult to remove naturally. As piston rod 1 retracts into the guide sleeve 2, they not only cause unavoidable damage to the header cylinder itself but also contaminate the entire hydraulic system, further triggering secondary failures. These types of problems are often difficult to diagnose and repair, increasing equipment maintenance costs and time.

[0053] In view of this, the industry has been exploring improvement measures, attempting to optimize the design of the safety card to ensure its original safety protection function while providing effective protection for the piston rod 1 of the header cylinder, reducing damage and contamination caused by clay and other impurities, thereby improving the overall reliability and service life of the harvester.

[0054] Reference Figures 1-2 This embodiment provides a cutting table cylinder, which is a hydraulic cylinder used for lifting and lowering the cutting table. The cutting table cylinder includes a guide sleeve 2 and a piston rod 1 (which belongs to the prior art) passing through the guide sleeve 2. The end of the piston rod 1 is provided with a hinge rod 101, which is used to hinge with the ear plate on the cutting table bridge. It should be noted that since this solution focuses on the innovation of the extended end of the piston rod 1 of the cutting table cylinder, the other basic components of the cylinder will not be described in detail.

[0055] A protective structure is provided on the outer side of the piston rod 1, which is used to prevent mud and sand from adhering to the piston rod 1;

[0056] During the extension and retraction of the piston rod 1, the protective structure can move axially along the guide sleeve 2 following the piston rod 1. After the piston rod 1 extends beyond the guide sleeve 2, a groove 4 is formed between the protective cylinder 3, the piston rod 1 and the guide sleeve 2.

[0057] It also includes a safety clip, which comprises a clip detachably disposed in the groove 4 for limiting the return stroke of the piston rod 1. The clip can be installed after the piston rod 1 extends out and exposes the groove 4; generally, the clip is installed after the piston rod 1 is fully extended.

[0058] It should be noted that in the field of agricultural machinery, the "bridge" refers to the part that connects the header and the machine body (frame). Its main function is to transmit power and connect various working parts on the header.

[0059] Specifically, between the header (the part of the harvester responsible for cutting crops) and the main body of the machine, there is a structure for transmitting power and coordinating the movement of the header; this part is often referred to as the "bridge." It typically includes transmission devices such as pulleys and chains, which transmit the engine's power to the blades and other components on the header, enabling them to operate properly.

[0060] Specifically, the hinge rod 101 of the piston rod 1 has a first through hole (in actual installation, the hinge rod 101 is located at the upper end of the piston rod 1, while the bottom part of the cutting table cylinder is mounted on the frame). The cutting table bridge has an ear plate for connecting the piston rod 1, and the ear plate has a second through hole. A pin assembly 7 is installed in the first and second through holes to establish a hinge between the piston rod 1 and the cutting table bridge. The pin assembly 7 includes a matching pin and a cotter pin. Generally, ear plates and cutting table cylinders are symmetrically arranged on both sides of the cutting table bridge, and the cylinders on both sides operate synchronously to drive the lifting and lowering of the cutting table.

[0061] Specifically, the protective structure adopts a cylindrical protective cylinder 3. A sealing part 301 is provided on one end of the protective cylinder 3 near the hinge rod 101, that is, the sealing part 301 is provided on the upper end of the protective cylinder 3. The sealing part 301 and the protective cylinder 3 are integrally formed. A contour hole 302 is opened on the sealing part 301. The contour hole 302 is consistent with the shape and size of the hinge rod 101. The hinge rod 101 passes through the contour hole 302 without gaps.

[0062] At least one connecting ear plate 9 is fixedly provided on the end face of the sealing part 301, and the connecting ear plate 9 is located on one side or opposite sides of the hinge rod 101. The two ends of the connecting ear plate 9 are a fixed end and a free end, respectively. The fixed end of the connecting ear plate 9 is welded and fixed to the sealing part 301. The free end of the connecting ear plate 9 is provided with a hinge hole. The first through hole, the second through hole and the hinge hole are installed with a pin assembly 7 to establish a connection between the ear plate, the hinge rod 101 and the connecting ear plate 9 on the cutting table bridge. The connecting ear plate 9 is provided to fix the protective cylinder 3. When the pin assembly 7 is installed in the first through hole, the second through hole and the hinge hole, the protective cylinder 3 moves synchronously with the hinge rod 101 and rotates together around the pin of the pin assembly 7.

[0063] Preferably, the hinge rod 101 has an oblong cross-section, and its outer surface has two parallel planar portions; correspondingly, the contour hole 302 is also designed as an oblong hole with the same external dimensions as the hinge rod 101. This shape design of the hinge rod 101 and the contour hole 302 ensures that the hinge rod 101 will not deflect itself during rotation around the pin.

[0064] Preferably, two connecting ear plates 9 are fixedly provided on the end face of the sealing part 301. The two connecting ear plates 9 are parallel, and the plate surfaces of the two connecting ear plates 9 are respectively arranged parallel to the planar part. The pins in the pin assembly 7 are passed through the second through hole on the ear plate, the first through hole on the hinge rod 101, and the hinge hole on the connecting ear plate 9 in no particular order.

[0065] In this embodiment, an outer edge 303 is provided on the outer side of the end of the protective cylinder 3 away from the hinge rod 101, a third through hole is provided on the outer edge 303, and a fourth through hole is provided on the clip.

[0066] When the clip needs to be installed in the groove 4, a quick-connect pin 8 is installed in the third through hole and the fourth through hole. The quick-connect pin 8 can quickly connect and fix the clip and the protective cylinder 3.

[0067] Note: The quick-release pin 8 can also be replaced with a steel wire. The steel wire is passed through the third and fourth through holes to tighten and fix the clip to the protective cylinder 3.

[0068] In this embodiment, a flexible contact portion 6 is provided on the inner side of the locking component, through which the locking component flexibly contacts the piston rod 1. The flexible contact portion 6 can be made of flexible rubber or nylon material to prevent the locking component from scratching the surface of the piston rod 1 during sliding.

[0069] In this embodiment, the card has been specifically designed, such as... Figure 1As shown: The card includes a connecting part 501, a middle part 502 and an abutting part 503 connected in sequence;

[0070] The fourth through hole is provided on the connecting part 501 to connect with the protective cylinder 3, the abutting part 503 is used to abut against the end face of the guide sleeve 2, and the flexible contact part 6 is disposed on the inner side of the middle part 502.

[0071] Preferably, the connecting portion 501, the intermediate portion 502, and the abutting portion 503 of the clip are all semi-circular. The connecting portion 501 and the abutting portion 503 are semi-circular annular plate structures, and the intermediate portion 502 is a semi-circular cylindrical structure. The central axes of the connecting portion 501, the intermediate portion 502, and the abutting portion 503 are parallel to the central axis of the piston rod 1. Specifically, the connecting portion 501 is designed as a semi-circular ring to correspond to the lower edge of the protective cylinder 3, and the intermediate portion 502 is designed as a semi-circular ring to correspond to the piston rod 1 and fit over the outside of the piston rod 1. Based on this, the flexible contact portion 6 is also provided as a semi-circular ring and correspondingly disposed inside the intermediate portion 502, and the intermediate portion 502 is attached to the outside of the piston rod 1 through the flexible contact portion 6. The abutting portion 503 is designed as a semi-circular ring to abut against the guide sleeve 2.

[0072] When overhauling the cutting table, the piston rod 1 of the hydraulic cylinder of the cutting table extends and the cutting table is raised. The groove 4 between the protective cylinder 3 and the guide sleeve 2 is revealed. At this time, the clamp is installed in the groove 4. The clamp is located between the protective cylinder 3 and the guide sleeve 2. The clamp blocks the protective cylinder 3, which prevents the protective cylinder 3 from sliding down and thus prevents the cutting table from falling. This solves the problem of the cutting table falling unexpectedly due to the sudden failure of the hydraulic system in the prior art, and thus ensures the personal safety of maintenance personnel.

[0073] In addition, a protective sleeve 3 is provided on the outer side of the piston rod 1, and the contour hole 302 is a contour design. The shape and size of the contour hole 302 are consistent with the cross-section of the hinge rod 101. This not only ensures the freedom of the relative position of the piston rod 1 and the protective sleeve 3, but also prevents clay and other impurities from the harvested ground from adhering to the piston rod 1, and prevents sand and gravel bounced up from the sandy harvested ground from hitting the piston rod 1. This provides protection for the piston rod 1. During the process of the piston rod 1 retracting into the guide sleeve 2, it will not cause unavoidable damage to the header cylinder itself, nor will it contaminate the entire hydraulic system, nor will it further cause secondary failure problems. This reduces the maintenance cost and time of the equipment and improves the service life of the header cylinder and the harvester.

[0074] Example 3

[0075] This embodiment provides a cutting table hydraulic cylinder, which differs from the technical solution of Embodiment 2 in that the clamping structure is different, as detailed below:

[0076] In this embodiment, the clamp is a movable sleeve structure, and the clamp is composed of two semi-circular cylinders spliced ​​together;

[0077] The two semi-circular cylinders are fastened together by a snap fastener. When the groove 4 between the protective cylinder 3 and the guide sleeve 2 is exposed, the clip is placed in the groove 4 and fastened together by the snap fastener. The clip is located between the protective cylinder 3 and the guide sleeve 2. The clip blocks the protective cylinder 3, which prevents the piston rod 1 from sliding down and thus prevents the cutting table from falling. This solves the problem of the cutting table falling unexpectedly due to the sudden failure of the hydraulic system in the prior art, and thus ensures the personal safety of maintenance personnel.

[0078] Alternatively, after the two semi-circular cylinders are fitted over the outside of the piston rod 1, they can be tied together by ropes (e.g., steel wires).

[0079] Example 4

[0080] A harvester includes a header, a header bridge, and a frame. The header is connected to the frame via the header bridge. The harvester also includes a header cylinder as described in any of embodiments 1-3. The bottom portion of the header cylinder is mounted on the frame or the main body of the harvester. The hinge rod 101 of the piston rod 1 of the header cylinder is hinged to the ear plate on the header bridge. The header cylinder is used to raise or lower the header.

[0081] The cutter head bridge is symmetrically equipped with ear plates on both sides, and cutter head cylinders are also symmetrically installed. The cutter head cylinders on both sides operate synchronously to drive the cutter head to rise and fall.

[0082] The beneficial effects of the technical solution of this utility model are:

[0083] Without adding redundant devices, structural improvements to the safety catch of the header cylinder, and the design of the catch and protective cylinder 3, can achieve two protective functions. It can ensure the header's anti-fall function while also providing effective protection for the piston rod 1 of the header cylinder, reducing damage and contamination caused by clay and other impurities, thereby improving the overall reliability and service life of the harvester. The protection is reliable and the cost is low.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0085] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cutting table hydraulic cylinder, comprising a guide sleeve (2) and a piston rod (1) passing through the guide sleeve (2), wherein the end of the piston rod (1) is provided with a hinge rod (101), the hinge rod (101) being used for hinged to an ear plate on the cutting table bridge; characterized in that, A protective structure is provided on the outside of the piston rod (1), which is used to prevent mud and sand from adhering to the piston rod (1); The protective structure can move axially along the guide sleeve (2) following the piston rod (1). After the piston rod (1) extends beyond the guide sleeve (2) to the point where the protective structure extends beyond the guide sleeve (2), a groove (4) is formed between the protective structure, the piston rod (1) and the guide sleeve (2). It also includes a safety card, which includes a card element that is detachably disposed in the groove (4) for limiting the return stroke of the piston rod (1).

2. The cutting platform cylinder according to claim 1, characterized in that, The hinge rod (101) has a first through hole, and the ear plate of the cutting table bridge has a second through hole; The protective structure adopts a protective cylinder (3). A sealing part (301) is provided on one end of the protective cylinder (3) near the hinge rod (101). A contour hole (302) is opened on the sealing part (301). The shape and size of the contour hole (302) are the same as those of the cross section of the hinge rod (101). The hinge rod (101) passes through the contour hole (302) and there is no gap between them. At least one connecting ear plate (9) is fixedly provided on the end face of the sealing part (301), and the connecting ear plate (9) is located on one side or opposite sides of the hinge rod (101). The free end of the connecting ear plate (9) is provided with a hinge hole, and a pin assembly (7) is installed in the first through hole, the second through hole and the hinge hole.

3. The cutting platform cylinder according to claim 2, characterized in that, The hinge rod (101) has a waist-shaped cross-section, and the outer side of the hinge rod (101) has two parallel planar portions. The end face of the sealing part (301) is fixedly provided with two connecting ear plates (9), and the plate surfaces of the two connecting ear plates (9) are respectively arranged parallel to the planar part.

4. The cutting platform cylinder according to claim 2, characterized in that, An outer edge (303) is provided on the outer side of the end away from the hinge rod (101) of the protective cylinder (3), and a third through hole is provided on the outer edge (303), and a fourth through hole is provided on the clip; When the card is installed in the groove (4), quick-release pins (8) are installed in the third through hole and the fourth through hole. The quick-release pins (8) are used to connect the card and the protective cylinder (3).

5. The cutting platform cylinder according to claim 4, characterized in that, The inner side of the card is provided with a flexible contact part (6), and the card makes flexible contact with the piston rod (1) through the flexible contact part (6).

6. The cutting platform cylinder according to claim 5, characterized in that, The card includes a connecting part (501), a middle part (502), and an abutting part (503) connected in sequence; The fourth through hole is provided on the connecting part (501) to connect with the protective cylinder (3), the abutting part (503) is used to abut against the end face of the guide sleeve (2), and the flexible contact part (6) is provided on the inner side of the middle part (502).

7. The cutting platform cylinder according to claim 6, characterized in that, The connecting part (501) and the abutting part (503) are semi-circular annular plate structures, and the middle part (502) is a semi-circular cylindrical structure. The central axes of the connecting part (501), the middle part (502) and the abutting part (503) are parallel to the central axis of the piston rod (1).

8. The cutting platform cylinder according to claim 5, characterized in that, The flexible contact part (6) is made of rubber or nylon.

9. The cutting platform cylinder according to claim 1, characterized in that, The clamp is a movable sleeve structure, and the clamp is composed of two semi-circular cylinders spliced ​​together; The two semi-circular cylinders are fastened together by buckles, or the two semi-circular cylinders are bound together by ropes.

10. A harvester, comprising a header, a header bridge, and a frame, wherein the header is connected to the frame via the header bridge, characterized in that, It also includes a cutting table cylinder according to any one of claims 1-9, wherein the bottom of the cutting table cylinder is mounted on the frame, the hinge rod (101) of the cutting table cylinder is hinged to the ear plate on the cutting table bridge, and the cutting table cylinder is used to lift or lower the cutting table.

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