Oil cylinder safety clamp and harvester

Abstract

The utility model relates to the technical field of harvesters, in particular to an oil cylinder safety clamp and a harvester, the oil cylinder safety clamp comprises a sleeve and a resisting component, and the sleeve is arranged outside a telescopic cylinder rod in a sleeving mode and rotationally connected with a target object; the sleeve is connected with the telescopic cylinder rod; an auxiliary installation part is formed at the end, close to the fixed cylinder body, of the sleeve, an insertion groove is formed in the auxiliary installation part, and a part of structure of the resisting component is detachably inserted into the insertion groove. The end of the fixed cylinder body can abut against the structure, located outside the inserting groove, of the resisting component and is used for keeping the telescopic cylinder rod in the stretching-out state. Therefore, the sleeve can wrap the telescopic cylinder rod, the problem that the oil cylinder is dirty due to soil or dust on the ground during running or operation is solved, the opening or closing operation of the oil cylinder safety clamp is completed only through the insertion and extraction matching of the resisting component and the insertion groove, and the oil cylinder safety clamp is simple, convenient, time-saving and labor-saving.

Description

Technical Field

[0001] The present application relates to the technical field of harvesters, and in particular to an oil cylinder safety card and a harvester. Background Art

[0002] At present, the safety card equipped on the bridge cylinder of the harvester is generally a U-shaped bent plate structure, which has the following problems: on the one hand, the bottom of the bridge cylinder is exposed, and when the vehicle is driving or working, the mud or dust on the ground will cause the bridge cylinder to be dirty; on the other hand, when in use, the safety card needs to be assembled together with the bridge cylinder. After use, the safety card needs to be completely removed from the bridge cylinder so as not to affect the normal operation of the bridge cylinder. Since the safety card is generally bulky, installation and removal are troublesome, time-consuming and labor-intensive. Utility Model Content

[0003] The purpose of the present application is to provide a cylinder safety card, which to some extent solves the technical problems that the cylinder safety card of the harvester in the prior art generally has a U-shaped bent plate structure, so that the bottom of the bridge cylinder is exposed. When the vehicle is driving or operating, mud or dust on the ground will cause the bridge cylinder to become dirty, and the installation and disassembly of the safety card is troublesome, time-consuming and labor-intensive.

[0004] The present application provides a cylinder safety card, which is applied to an oil cylinder, and the oil cylinder includes a fixed cylinder body and a telescopic cylinder rod, and the cylinder safety card includes: a sleeve and a resisting member; wherein the sleeve is used to be sleeved on the outside of the telescopic cylinder rod and rotatably connected to a target object, and the opening of the sleeve is arranged toward one side of the fixed cylinder body; the sleeve is connected to the telescopic cylinder rod so that the fixed cylinder body can move relative to the telescopic cylinder rod and the sleeve;

[0005] An auxiliary mounting portion is formed at one end of the sleeve close to the fixed cylinder body, and a slot is formed on the auxiliary mounting portion. A portion of the structure of the retaining member is detachably inserted into the slot, and another portion of the structure extends to the outside of the slot. When the fixed cylinder body moves to the extreme position relative to the telescopic cylinder rod and the sleeve, the end of the fixed cylinder body close to the telescopic cylinder rod can abut against the structure of the retaining member exposed in the slot, so as to keep the telescopic cylinder rod in an extended state.

[0006] In the above technical solution, further, the auxiliary mounting portion includes a mounting plate and a limit plate connected to each other; wherein the mounting plate is arranged at one end of the sleeve close to the fixed cylinder body, and the limit plate is arranged at one side of the mounting plate close to the fixed cylinder body;

[0007] The mounting plate is formed with a mounting through hole connected to the sleeve, and the telescopic cylinder rod can extend into the sleeve through the mounting through hole; the limit plate is arranged on the side of the mounting through hole, and the limit plate and the mounting plate are surrounded by the slot with an end opening.

[0008] In any of the above technical solutions, further, the limiting plate is U-shaped and is arranged around the mounting through hole, so that the slots are formed on opposite sides of the mounting through hole;

[0009] The retaining member is a U-shaped plate, and the two ends of the retaining member can be inserted into the two slots in a one-to-one correspondence.

[0010] In any of the above technical solutions, further, the inner side of the slot close to the telescopic cylinder rod is open.

[0011] In any of the above technical solutions, further, the oil cylinder safety card also includes a storage pin, which is fixed to the sleeve and part of its structure is exposed from the sleeve; the resisting member is detachably connected to the structure of the storage pin exposed from the sleeve.

[0012] In any of the above technical solutions, further, the oil cylinder safety card also includes a fixing pin, and when the retaining member is inserted into the slot, the fixing pin is used to connect the retaining member and the auxiliary mounting portion, and the three are detachably connected.

[0013] In any of the above technical solutions, further, the cylinder safety card also includes an ear plate and a pin; wherein the ear plate is installed at an end of the sleeve away from the auxiliary mounting portion; the ear plate and the target object are detachably connected via the pin.

[0014] In any of the above technical solutions, further, a through hole is formed at one end of the sleeve away from the fixed cylinder body, and one end of the telescopic cylinder rod away from the fixed cylinder body passes through the through hole and is detachably connected to the ear plate and the target object through the pin shaft.

[0015] In any of the above technical solutions, further, the sleeve and the telescopic cylinder rod are detachably connected via an auxiliary pin.

[0016] The present application also provides a harvester, comprising the cylinder safety card described in any of the above technical solutions, and thus having all the beneficial technical effects of the cylinder safety card, which will not be repeated here.

[0017] In the above technical solution, further, the harvester also includes a front axle, a bridge and an oil cylinder; wherein the oil cylinder includes a fixed cylinder body and a telescopic cylinder rod connected to each other, and the fixed cylinder body is rotatably connected to the front axle, the sleeve is sleeved on the outside of the telescopic cylinder rod and rotatably connected to the bridge, and the opening of the sleeve is arranged toward one side of the fixed cylinder body;

[0018] The sleeve is connected to the telescopic cylinder rod so that the fixed cylinder body can move relative to the telescopic cylinder rod and the sleeve; the retaining member is detachably inserted into the slot, and when the fixed cylinder body moves to the extreme position relative to the telescopic cylinder rod and the sleeve, the end of the fixed cylinder body close to the telescopic cylinder rod can abut against the retaining member to keep the telescopic cylinder rod in an extended state.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The sleeve of the oil cylinder safety card can be sleeved on the outside of the telescopic cylinder rod of the oil cylinder, that is, it can wrap the telescopic cylinder rod, thereby avoiding the problem of the oil cylinder being dirty due to mud or dust on the ground during driving or operation, and the operation of opening or closing the oil cylinder safety card can be completed only by plugging and pulling out the supporting member and the slot, without removing the entire safety card from the oil cylinder, so the operation is simpler and more convenient, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of the oil cylinder safety card provided in the embodiment of the present application;

[0023] Figure 2 Another structural schematic diagram of the oil cylinder safety card provided in the embodiment of the present application;

[0024] Figure 3 An assembly diagram of the oil cylinder safety card and the oil cylinder provided in the embodiment of the present application;

[0025] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A;

[0026] Figure 5 Another assembly diagram of the oil cylinder safety card and the oil cylinder provided in the embodiment of the present application;

[0027] Figure 6 Another assembly diagram of the oil cylinder safety card and the oil cylinder provided in the embodiment of the present application;

[0028] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at B.

[0029] Reference numerals:

[0030] 1-oil cylinder, 11-fixed cylinder body, 12-telescopic cylinder rod, 2-sleeve, 21-auxiliary mounting part, 211-mounting plate, 212-limiting plate, 2121-first limiting plate, 2122-second limiting plate, 2123-connecting strip, 213-mounting through hole, 214-slot, 215-through hole, 22-ear plate, 3-resisting member, 4-storage pin, 5-fixing pin, 6-pin shaft. DETAILED DESCRIPTION

[0031] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0032] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0033] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0034] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Refer to the following Figures 1 to 7 The invention describes a cylinder safety card and a harvester according to some embodiments of the present application.

[0037] Embodiment 1

[0038] See also Figures 1 to 7 As shown, an embodiment of the present application provides a cylinder safety card, which is applied to a cylinder 1, and the cylinder 1 includes a fixed cylinder body 11 and a telescopic cylinder rod 12, and preferably, the diameter of the fixed cylinder body 11 is larger than the diameter of the telescopic cylinder rod 12, and the cylinder safety card includes: a sleeve 2 and a resisting member 3; wherein the sleeve 2 is used to be sleeved on the outside of the telescopic cylinder rod 12 and rotatably connected to the target object, and the opening of the sleeve 2 is arranged toward one side of the fixed cylinder body 11; the sleeve 2 is connected to the telescopic cylinder rod 12, so that the fixed cylinder body 11 can move relative to the telescopic cylinder rod 12 and the sleeve 2;

[0039] An auxiliary mounting portion 21 is formed at one end of the sleeve 2 close to the fixed cylinder body 11, and a slot 214 is formed on the auxiliary mounting portion 21. A portion of the structure of the resisting member 3 is detachably inserted into the slot 214, and another portion of the structure extends to the outside of the slot 214. When the fixed cylinder body 11 moves to the extreme position relative to the telescopic cylinder rod 12 and the sleeve 2, the end of the fixed cylinder body 11 close to the telescopic cylinder rod 12 can abut against the structure of the resisting member 3 exposed in the slot 214, so as to keep the telescopic cylinder rod 12 in an extended state.

[0040] Based on the structure described above, it can be known that the oil cylinder safety card provided in this application can be applied to the oil cylinder 1, and is specifically described here by taking the application on a harvester as an example:

[0041] Among them, the harvester includes a front axle, a bridge and a cylinder 1. When the cylinder safety card provided in the present application is installed on the harvester, the fixed cylinder body 11 of the cylinder 1 is rotatably connected to the front axle, the sleeve 2 is sleeved on the outside of the telescopic cylinder rod 12, and the sleeve 2 is rotatably connected to the bridge.

[0042] like Figure 6 and Figure 7As shown, when it is necessary to close the safety card of the oil cylinder, the resisting member 3 can be inserted into the slot 214 of the auxiliary mounting portion 21 at the end of the sleeve 2, so that when the fixed cylinder body 11 moves to the extreme position relative to the telescopic cylinder rod 12 and the sleeve 2, that is, when the oil cylinder 1 is depressurized, the end of the fixed cylinder body 11 close to the telescopic cylinder rod 12 can abut against the resisting member 3, thereby keeping the telescopic cylinder rod 12 in an extended state, that is, there is no risk of sudden falling of the bridge due to the depressurization of the oil cylinder 1, which is safer and more reliable.

[0043] like Figure 3 and Figure 4 As shown, when the oil cylinder safety card needs to be opened, it is only necessary to remove the blocking member 3 from the slot 214, thereby releasing the limit on the fixed cylinder body 11, and the operation is simple and convenient.

[0044] In combination with the above, it can be known that the sleeve 2 of the oil cylinder safety card can be sleeved on the outside of the telescopic cylinder rod 12 of the oil cylinder 1, that is, it can wrap the telescopic cylinder rod 12, thereby avoiding the problem of the oil cylinder 1 being dirty due to mud or dust on the ground during driving or operation, and the operation of opening or closing the oil cylinder safety card is completed only by plugging and unplugging the resisting member 3 and the slot 214, without removing the entire safety card from the oil cylinder 1, which makes the operation simpler and more convenient, saving time and effort.

[0045] In this embodiment, preferably, Figure 1 , Figure 4 and Figure 7 As shown, the auxiliary mounting portion 21 includes a mounting plate 211 and a limiting plate 212 connected to each other; wherein the mounting plate 211 is arranged at one end of the sleeve 2 close to the fixed cylinder body 11, and the limiting plate 212 is arranged at one side of the mounting plate 211 close to the fixed cylinder body 11;

[0046] The mounting plate 211 is formed with a mounting through hole 213 which is in communication with the sleeve 2, and the telescopic cylinder rod 12 can extend into the sleeve 2 through the mounting through hole 213, that is, the mounting plate 211 can be sleeved on the telescopic cylinder rod 12 through the mounting through hole 213, and does not interfere with the telescopic cylinder rod 12, so that the telescopic cylinder rod 12 can be freely extended and retracted; the limit plate 212 is arranged on the side of the mounting through hole 213, and the limit plate 212 and the mounting plate 211 are surrounded by a slot 214 with an end opening.

[0047] According to the structure described above, it can be known that the mounting plate 211 plays a role of supporting the limiting plate 212 , and together with the limiting plate 212 , forms the aforementioned slot 214 , which facilitates the insertion of the blocking member 3 .

[0048] Furthermore, preferably, the mounting plate 211 and the limiting plate 212 may be an integrated structure or a split structure, and may be assembled together later by welding or the like.

[0049] In this embodiment, preferably, Figure 1 and Figure 4 As shown, the limiting plate 212 is U-shaped and is arranged around the mounting through hole 213 so that slots 214 are formed on opposite sides of the mounting through hole 213;

[0050] The retaining member 3 is a U-shaped plate, and the two ends of the retaining member 3 can be inserted into the two slots 214 in a one-to-one correspondence.

[0051] According to the structure described above, the limiting plate 212 is arranged to be U-shaped, so that slots 214 are formed on both sides of the mounting through hole 213. Correspondingly, the retaining member 3 is also designed to be U-shaped, so that the two side ends of the retaining member 3 are inserted into two corresponding slots 214 toward the limiting plate 212, so that the assembly of the retaining member and the auxiliary mounting part 21 is more firm and more stable.

[0052] Further, preferably, the inner side of the slot 214 near the mounting through hole 213 is open, which plays a role in avoiding the inner side of the resisting member 3, avoiding interference, facilitating assembly, and allowing the inner side of the resisting member 3 to be close to the telescopic cylinder rod 12, facilitating the position limiting of the fixed cylinder body 11 connected to the telescopic cylinder rod 12. Of course, not limited to this, the inner side of the slot 214 near the telescopic cylinder rod 12 can also be closed, and in order to avoid interference with the resisting member 3, the width of the insertion end of the resisting member 3 can be reduced, thereby facilitating its insertion into the slot 214.

[0053] Further, preferably, the U-shaped opening of the U-shaped limiting plate 212 is arranged upward to facilitate the insertion of the blocking member 3. Of course, this is not limited to this. The U-shaped opening of the U-shaped limiting plate 212 can be facing the side or the bottom, which can be selected according to actual needs.

[0054] Further, preferably, Figure 1 As shown, the cross-sections of the two opposite sides of the limit plate 212 are L-shaped, that is, the two opposite sides of the limit plate 212 include a first limit plate 2121 and a second limit plate 2122; wherein, the first limit plate 2121 is vertically connected to the second limit plate 2122 and the mounting plate 211, respectively, and the mounting plate 211 and the second limit plate 2122 are both arranged along an axis perpendicular to the telescopic cylinder rod 12, and the first limit plate 2121 is arranged along an axis parallel to the telescopic cylinder rod 12, and the mounting plate 211 is used to close one side opening of the L-shape, so that the side of the slot 214 close to the telescopic cylinder rod 12 is open in design.

[0055] Further, preferably, Figure 1As shown, the limit plate 212 also includes a connecting strip 2123, and the connecting strip 2123 is arranged below the two slots 214 and is used to close the bottom of the two slots 214. The connecting strip 2123 is respectively connected to the two first limit plates 2121 and the two second limit plates 2122. In addition, an arc-shaped avoidance notch is formed on the top of the connecting strip 2123 for avoiding the cylinder rod.

[0056] It should be noted that the shape of the limiting plate 212 is not limited to the U-shape, but can also be other shapes. For example, the limiting plate 212 can be long and straight, that is, only one side of the long and straight side of the original U-shaped structure is taken as the structure of the limiting plate 212, which is arranged on one side of the mounting through hole 213. In addition, the number of slots 214 is not limited to two, but can also be one. For example, when the limiting plate 212 is long and straight, when the number of the limiting plates 212 is one, then one slot 214 is formed accordingly, and when the number of the limiting plates 212 is two, then two slots 214 are formed accordingly. The specific design should be based on actual needs.

[0057] In this embodiment, preferably, Figures 1 to 3 As shown, the oil cylinder safety card also includes a storage pin 4, which is fixed to the sleeve 2, and part of its structure is exposed from the sleeve 2; the resisting member 3 is detachably connected to the structure of the storage pin 4 exposed from the sleeve 2.

[0058] According to the structure described above, after the abutting member is taken out from the slot 214, it can be fixed on the storage pin 4. Correspondingly, a pin hole is formed on the resisting member 3 to avoid the problem of the resisting member 3 being easily lost due to random placement, and the structure is safer and more reliable.

[0059] In this embodiment, preferably, Figure 6 and Figure 7 As shown, the oil cylinder safety card further includes a fixing pin 5, and when the retaining member 3 is inserted into the slot 214, the fixing pin 5 is used to connect the retaining member 3 and the auxiliary mounting portion 21, and the three are detachably connected.

[0060] According to the structure described above, it can be known that after the resisting member 3 is inserted into the slot 214, the fixing pin 5 can be used to connect the resisting member 3 and the auxiliary mounting portion 21 together, so that the resisting member 3 is more stable and not easy to fall out of the slot 214. The structure is safer and more reliable. Moreover, the above-mentioned pin connection structure is a detachable connection method, which is convenient for the later disassembly operation of the resisting member 3.

[0061] In this embodiment, preferably, Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the cylinder safety card also includes an ear plate 22 and a pin 6; wherein the ear plate 22 is installed at the end of the sleeve 2 away from the auxiliary mounting portion 21; the ear plate 22 and the target object, i.e., the bridge, are detachably connected through the pin 6.

[0062] According to the structure described above, the ear plate 22 is connected to the bridge by using the pin 6, and the ear plate 22 and the bridge are rotatably connected, so that adaptive adjustment can be made.

[0063] In this embodiment, preferably, Figure 2 and Figure 5 As shown, a through hole 215 is formed at the end of the sleeve 2 facing away from the fixed cylinder body 11, and the end of the telescopic cylinder rod 12 away from the fixed cylinder body 11 passes through the through hole 215 and is detachably connected to the target object, i.e., the bridge, through the ear plate 22 through the pin 6. Correspondingly, auxiliary installation through holes 215 need to be provided on both the ear plate 22 and the telescopic cylinder rod 12 for installing the above-mentioned pin 6, and the diameter of the auxiliary installation through holes 215 needs to be larger than the diameter of the pin 6.

[0064] According to the structure described above, the telescopic cylinder rod 12 can extend through the rear end of the sleeve 2 to the side of the ear plate 22, and finally be rotatably connected to the bridge through the pin 6. It can be seen that the telescopic cylinder rod 12 and the sleeve 2 are simultaneously connected to the bridge using the same pin 6, which has a simple structure, is easy to operate, and saves parts.

[0065] It should be noted that: not limited to the above-mentioned structure in which the telescopic cylinder rod 12, the ear plate 22 and the bridge are connected by the same pin 6, the following structure can also be adopted: for example: only the ear plate 22 and the bridge are connected by the pin 6, while the telescopic cylinder rod 12 and the sleeve 2 can be connected by other pins, namely auxiliary pins, and preferably, the telescopic cylinder rod 12 and the sleeve 2 are both provided with auxiliary through holes 215, and the auxiliary pins are sequentially inserted into the auxiliary through holes 215 opened on the telescopic cylinder rod 12 and the sleeve 2, thereby realizing the connection between the telescopic cylinder rod 12 and the sleeve 2.

[0066] In addition, this cylinder safety card is not limited to use on the bridge cylinder of the harvester, but can also be used on the cylinders of other devices. It can prevent the risk of sudden falling of the structure connected to the telescopic cylinder rod of the cylinder due to cylinder pressure release, and is safer and more reliable.

[0067] Embodiment 2

[0068] Embodiment 2 of the present application also provides a harvester, including the cylinder safety card described in the above embodiment 1, and thus, has all the beneficial technical effects of the cylinder safety card, and the same technical features and beneficial effects are not repeated.

[0069] In this embodiment, preferably, the harvester further comprises a front axle, a bridge and an oil cylinder 1; wherein the oil cylinder 1 comprises a fixed cylinder body 11 and a telescopic cylinder rod 12 connected to each other, and the fixed cylinder body 11 is rotatably connected to the front axle, the sleeve 2 is sleeved on the outside of the telescopic cylinder rod 12, and the sleeve 2 is rotatably connected to the bridge, and the opening of the sleeve 2 is arranged toward one side of the fixed cylinder body 11;

[0070] The sleeve 2 is connected to the telescopic cylinder rod 12 so that the fixed cylinder body 11 can move relative to the telescopic cylinder rod 12 and the sleeve 2; a part of the structure of the resisting member 3 is detachably inserted into the slot 214, and another part of its structure extends to the outside of the slot 214. When the fixed cylinder body 11 moves to the extreme position relative to the telescopic cylinder rod 12 and the sleeve 2, the end of the fixed cylinder body 11 close to the telescopic cylinder rod 12 can abut against the structure of the resisting member 3 exposed in the slot 214, so as to keep the telescopic cylinder rod 12 in an extended state.

[0071] According to the structure described above, the harvester provided in the present application is equipped with a new type of cylinder safety card, wherein the sleeve 2 of the cylinder safety card can be sleeved on the outside of the telescopic cylinder rod 12 of the cylinder 1, that is, wrapping the telescopic cylinder rod 12, thereby avoiding the problem of the cylinder 1 being dirty due to mud or dust on the ground during driving or operation, and the opening or closing operation of the cylinder safety card is completed only by the plug-in cooperation of the resisting member 3 and the slot 214, without the need to remove the entire safety card from the cylinder 1, so the operation is simpler and more convenient, saving time and effort.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylinder safety card, applied to an oil cylinder, wherein the oil cylinder comprises a fixed cylinder body and a telescopic cylinder rod, characterized in that: The oil cylinder safety card comprises: a sleeve and a resisting member; wherein the sleeve is used to be sleeved on the outside of the telescopic cylinder rod and is rotatably connected to the target object, and the opening of the sleeve is arranged toward one side of the fixed cylinder body; the sleeve is connected to the telescopic cylinder rod so that the fixed cylinder body can move relative to the telescopic cylinder rod and the sleeve; An auxiliary mounting portion is formed at one end of the sleeve close to the fixed cylinder body, and a slot is formed on the auxiliary mounting portion. A portion of the structure of the retaining member is detachably inserted into the slot, and another portion of the structure extends to the outside of the slot. When the fixed cylinder body moves to the extreme position relative to the telescopic cylinder rod and the sleeve, the end of the fixed cylinder body close to the telescopic cylinder rod can abut against the structure of the retaining member exposed in the slot, so as to keep the telescopic cylinder rod in an extended state.

2. The oil cylinder safety card according to claim 1, characterized in that: The auxiliary mounting portion includes a mounting plate and a limiting plate connected to each other; wherein the mounting plate is arranged at one end of the sleeve close to the fixed cylinder body, and the limiting plate is arranged at one side of the mounting plate close to the fixed cylinder body; The mounting plate is formed with a mounting through hole connected to the sleeve, and the telescopic cylinder rod can extend into the sleeve through the mounting through hole; the limit plate is arranged on the side of the mounting through hole, and the limit plate and the mounting plate are surrounded by the slot with an end opening.

3. The oil cylinder safety card according to claim 2, characterized in that: The limiting plate is U-shaped and is arranged around the mounting through hole so that the slots are formed on opposite sides of the mounting through hole; The retaining member is a U-shaped plate, and the two ends of the retaining member can be inserted into the two slots in a one-to-one correspondence.

4. The oil cylinder safety card according to claim 2, characterized in that: The inner side of the slot close to the telescopic cylinder rod is open.

5. The oil cylinder safety card according to claim 1, characterized in that: The oil cylinder safety card also includes a storage pin, which is fixed to the sleeve and part of its structure is exposed from the sleeve; the resisting member is detachably connected to the structure of the storage pin exposed from the sleeve.

6. The oil cylinder safety card according to claim 1, characterized in that: The oil cylinder safety card also includes a fixing pin. When the retaining member is inserted into the slot, the fixing pin is used to connect the retaining member and the auxiliary mounting portion, and the three are detachably connected.

7. The oil cylinder safety card according to claim 1, characterized in that: The oil cylinder safety card also includes an ear plate and a pin; wherein the ear plate is arranged at an end of the sleeve away from the auxiliary mounting portion; and the ear plate is detachably connected to the target object via the pin.

8. The oil cylinder safety card according to claim 7, characterized in that: A through hole is formed at one end of the sleeve away from the fixed cylinder body, and one end of the telescopic cylinder rod away from the fixed cylinder body passes through the through hole and is detachably connected to the ear plate and the target object through the pin shaft.

9. The oil cylinder safety card according to any one of claims 1 to 8, characterized in that: The sleeve is detachably connected to the telescopic cylinder rod via an auxiliary pin.

10. A harvester, characterized in that: The invention comprises a front axle, a bridge, an oil cylinder and an oil cylinder safety card according to any one of claims 1 to 9; wherein the oil cylinder comprises a fixed cylinder body and a telescopic cylinder rod connected to each other, and the fixed cylinder body is rotatably connected to the front axle, the sleeve is sleeved on the outside of the telescopic cylinder rod, and the sleeve is rotatably connected to the bridge, and the opening of the sleeve is arranged toward one side of the fixed cylinder body; The sleeve is connected to the telescopic cylinder rod so that the fixed cylinder body can move relative to the telescopic cylinder rod and the sleeve; a part of the structure of the resisting member is detachably inserted into the slot, and another part of the structure extends to the outside of the slot. When the fixed cylinder body moves to the extreme position relative to the telescopic cylinder rod and the sleeve, the end of the fixed cylinder body close to the telescopic cylinder rod can abut against the structure of the resisting member exposed in the slot, so as to keep the telescopic cylinder rod in an extended state.

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