Pin shaft, pin shaft assembly and rice transplanter

Abstract

The pin shaft comprises a pin shaft body, the pin shaft body is provided with a grease storage cavity of a hollow structure and a grease filling port, a grease outlet hole is formed in the circumferential face of the pin shaft body and communicated with the grease storage cavity, a spiral line groove is formed in the circumferential face of the pin shaft body, and the spiral line groove is communicated with the grease storage cavity through the grease outlet hole. The utility model further discloses a pin shaft assembly which comprises the pin shaft and a rotating sleeve arranged on the pin shaft in a sleeving mode. The utility model further discloses a rice transplanter which comprises a rack, a pin shaft assembly and a lifting connecting rod mechanism, and the rack and the lifting connecting rod mechanism are rotationally connected through the pin shaft assembly. According to the pin shaft, the pin shaft assembly and the rice transplanter provided by the utility model, grease can be quickly and uniformly smeared on the peripheral surface of the pin shaft, an oil film capable of blocking muddy water and lubricating can be quickly formed, the preparation time before operation of the rice transplanter is effectively shortened, the rice transplanting efficiency is improved, meanwhile, the lubricating action time of the grease is prolonged, and the service life of the pin shaft is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of rice transplanter accessories, in particular to a pin shaft, a pin shaft assembly and a rice transplanter. Background Art

[0002] Current high-speed rice transplanters on the market consist of a front transplanter frame and a rear planting unit, which requires high-frequency up-and-down motion. A lifting linkage connects the two parts. A pin assembly flexibly connects the lifting linkage to the frame. Specifically, the pin is inserted into the rotating sleeve of the lifting linkage and the rotating sleeve of the frame, enabling rotational motion between the frame and the lifting linkage.

[0003] During the actual farming process of the rice transplanter, it was found that since the rice transplanter has to plant seedlings in a pond, it is inevitable to come into contact with mud and water. When the water is deep, some parts will even be soaked in water. This will cause mud and water to enter the gap between the rotating sleeve and the pin shaft, resulting in greater friction and wear between the pin shaft and the rotating sleeve, causing the lifting link to rise and fall poorly, resulting in poor transplanting effect.

[0004] The pins currently on the market are solid cylindrical pins. Manually applying grease not only lubricates the pins but also prevents mud and water from entering the gap between the rotating sleeve and the pin. However, when re-applying grease is necessary, the pins are inserted into the rotating sleeve, so applying grease from the outside cannot penetrate the gap between the two and ensure a full coating of the pin surface. This requires complete disassembly before re-applying, which is very inconvenient and seriously affects the efficiency of the rice transplanter.

[0005] The existing solution is to make the pin into a hollow structure and open a hole on the pin surface to connect to the hollow structure. When applying butter, butter can be added to the hollow structure and pressure is used to squeeze the butter from the hollow structure through the surface hole to the pin surface. However, this coating effect is not uniform.

[0006] Patent CN218441769U discloses "a lubrication structure, a lifting connecting rod and a rice transplanter". Based on the existing technology, a grease storage tank is set on the rotating sleeve. Although it can store enough grease for the lubrication structure and effectively reduce the frequency of adding butter, the butter is distributed and diffused from the two oil outlets to the circumference of the pin shaft. Due to the narrow gap between the pin shaft and the rotating sleeve and the viscosity of the butter, the farther away from the oil outlet, the greater the diffusion pressure and the slower the diffusion speed. In addition, there is more butter close to the oil outlet and less butter far away from the oil outlet. It still cannot solve the problem of fast and uniform butter application. Moreover, the part that is not applied in place will cause muddy water to enter the gap between the rotating sleeve and the pin shaft, washing away the newly applied butter and causing rapid loss of butter. Even by over-adding butter, the effect of application cannot be significantly improved, and it will also cause waste of resources. In practice, the rice transplanter typically needs to be started in advance, with the lifting link repeatedly raised and lowered for an extended period of time. The rotating pressure of the rotating sleeve evenly spreads the grease, filling the gap between the rotating sleeve and the pin, forming a grease film around the pin that lubricates and blocks mud and water. However, this lengthy preparation can severely impact the transplanter's operating efficiency.

[0007] Therefore, how to quickly and evenly spread butter on the circumference of the pin shaft and form an oil film, reduce the operation preparation time of the rice transplanter, and improve the operation efficiency of the rice transplanter is a technical problem that needs to be solved. Utility Model Content

[0008] Based on the above content, in order to solve the main technical problem of the present invention to make the butter flow and distribute more quickly and evenly around the pin shaft when adding butter, so as to quickly form an oil film that can lubricate and block mud and water, the present invention provides a pin shaft, a pin shaft assembly and a rice transplanter that are conducive to quickly and evenly applying butter, effectively reducing the long preparation work of the rice transplanter and further improving the operating efficiency of the machine.

[0009] The present invention adopts the following technical solutions to solve the above-mentioned technical problems.

[0010] [A pin]

[0011] The first aspect of the present invention provides a pin shaft, including a pin shaft body, the pin shaft body having a hollow oil storage cavity and a grease filling port connected to the oil storage cavity, an oil outlet hole is opened on the circumference of the pin shaft body, the oil outlet hole is connected to the oil storage cavity, and a spiral groove is provided on the circumference of the pin shaft body, the spiral groove is connected to the oil storage cavity through the oil outlet hole.

[0012] Furthermore, there are two oil outlet holes, which are respectively opened at both ends of the pin body, and the two oil outlet holes are opened on the circumferential surface of the pin body in a circumferentially staggered manner.

[0013] Furthermore, the circumferential offset angle of the two oil outlet holes is 180 degrees.

[0014] Furthermore, one end of the pin body is fixedly connected to a pin piece, and a waist-shaped hole is also provided on the pin piece.

[0015] When in use, the grease enters from the grease filling port, passes through the hollow structure and the oil outlet, and is directed from the inside to the outside along the direction of the spiral groove. In the prior art, the grease distribution process is a process of spreading from the oil outlet to the surrounding areas of the hole to the surface of the pin, which is essentially a distribution process from point to surface. Compared with the prior art, the grease distribution process in the present invention is a process of guiding the grease from the oil outlet to the spiral groove, and then spreading from the spiral groove to the surface of the pin. Figure 1 The diffusion method shown is essentially a distribution process from line to surface. Furthermore, during the butter filling process, the spiral grooves in the utility model guide the butter, allowing for faster and more even distribution. Furthermore, before the rice transplanter is operational, the linkage mechanism no longer needs to be repeatedly raised and lowered for extended periods of time. Only one or two up and down movements are required to evenly coat the small portion of the pin surface that has not been properly coated. This significantly reduces the preparation time for the rice transplanter and improves its efficiency.

[0016] Furthermore, the butter, which flows from the inside out along the spiral grooves, can also prevent muddy water from entering from the outside in, thereby preventing muddy water from entering. Even if muddy water eventually enters the pin assembly due to butter loss, it can be squeezed out of the pin assembly along the spiral grooves by refilling the butter.

[0017] The two oil outlets allow the grease to be distributed faster along the spiral groove at the same filling pressure. Furthermore, the staggered placement of the two outlet holes around the circumference of the grease distribution further reduces the time it takes for the lifting linkage to repeatedly raise and lower the grease. The grease is most evenly distributed around the circumference of the grease pin when the angle formed by the two outlet holes and the central axis of the pin is 180 degrees.

[0018] Compared with the circular waist hole, the waist-shaped hole in the present invention makes the installation position of the pin shaft not unique, that is, the pin shaft produced in batches can be suitable for a wider range of installation positions or transplanting machine models, reducing production costs, improving product applicability, and being conducive to the improvement of existing transplanting machines.

[0019] [A pin assembly]

[0020] The second aspect of the present invention provides a pin assembly, including a pin and a rotating sleeve, the pin including a pin body, the pin body having a hollow oil storage cavity and a grease filling port connected to the oil storage cavity, an oil outlet hole is opened on the circumferential surface of the pin body, the oil outlet hole is connected to the oil storage cavity, a spiral groove is provided on the circumferential surface of the pin body, the spiral groove is connected to the oil storage cavity through the oil outlet hole, the rotating sleeve is arranged on the pin, and at least two annular oil storage grooves are provided on the inner surface of the rotating sleeve.

[0021] Furthermore, there are two oil outlet holes, namely a first oil outlet hole and a second oil outlet hole. The two oil outlet holes are circumferentially staggered and distributed on the circumferential surface of the pin shaft body. The rotating sleeve includes a first rotating sleeve unit and a second rotating sleeve unit. The first oil outlet hole corresponds to the first rotating sleeve unit, and the second oil outlet hole corresponds to the second rotating sleeve unit.

[0022] Furthermore, there are three oil outlet holes, namely the first oil outlet hole, the second oil outlet hole and the third oil outlet hole. The second oil outlet hole and the third oil outlet hole are adjacent and circumferentially staggered on the circumferential surface of the pin body. The rotating sleeve includes a first rotating sleeve unit and a second rotating sleeve unit. The first oil outlet hole corresponds to the first rotating sleeve unit, and the second oil outlet hole corresponds to the third oil outlet hole and the second rotating sleeve unit.

[0023] Furthermore, the butter filling port is provided with a butter nipple.

[0024] The combined oil tank and spiral groove are as follows Figure 10 As shown in the figure, after the spiral groove and the oil storage tank are filled with grease, the area formed by the spiral groove line and the oil storage tank line is not only smeared with grease from the spiral groove, but also with grease from the oil storage tank. That is, the grease in the spiral groove and the oil storage tank is simultaneously smeared and distributed on the pin surface, as shown in the figure. Figure 10 The grease spreading method shown above distributes the grease more quickly and evenly. Even with just the added pressure, the grease can be quickly and evenly spread across the pin surface, eliminating the need to repeatedly raise and lower the connecting rod to ensure even grease application and fill the gap between the rotating sleeve and the pin.

[0025] Moreover, the spiral groove can also ensure that each oil storage tank passing along the diversion direction is filled with butter, without the need to open an oil outlet hole for each oil storage tank as in the prior art CN218441769U, thereby ensuring the strength of the pin shaft.

[0026] The grease ring formed between the oil reservoir and the pin shaft surface after being filled with grease ensures excellent sealing performance, preventing dust, mud, water, and other dirt from entering the internal space of the pin assembly. Multiple grease rings provide a better mud and water barrier effect. At the same time, multiple oil reservoirs can store a larger amount of grease, effectively reducing the frequency of grease refilling and further improving the operating efficiency of the rice transplanter.

[0027] Splitting the rotary sleeve into two rotary sleeve units is more suitable for situations where two parts are connected to each other. Moreover, the two rotary sleeve units cooperate with each other. Under the action of the mutual rotation and squeezing of the two rotary sleeve units, the butter can flow from the rotary sleeve unit with more butter to the rotary sleeve unit with less butter, making the butter distribution faster and more even, further reducing the preparation time before the rice transplanter operation, and also facilitating the mutual replenishment of butter between the rotary sleeve units during the operation of the rice transplanter, improving the coordination of the pin shaft butter filling, reducing the filling frequency, and improving operation efficiency.

[0028] The grease nipple can improve the convenience of adding grease.

[0029] [A rice transplanter]

[0030] The third aspect of the present invention provides a rice transplanter, comprising a frame, a pin assembly and a lifting connecting rod mechanism, the frame and the lifting connecting rod mechanism are rotatably connected through the pin assembly, the pin assembly comprises a pin assembly provided by the second aspect of the present invention, the first rotating sleeve unit is arranged on the lifting connecting rod mechanism, the second rotating sleeve unit is arranged on the frame, and the pin is inserted into the first rotating sleeve unit and the second rotating sleeve unit at the same time.

[0031] Furthermore, one end of the pin body is fixedly connected to a pin plate, and a waist-shaped hole is also provided on the pin plate. The frame is provided with a fixing plate at a position corresponding to the second rotating sleeve unit, and a nut is provided on the fixing plate. The bolt threaded with the nut passes through the waist-shaped hole and cooperates with the nut to tighten the pin.

[0032] The above-mentioned rice transplanter significantly reduces the preparation time for repeated raising and lowering of the lifting link mechanism, effectively improving the working efficiency. By tightening the pin, the rotating sleeve can rotate more significantly relative to the pin, and the butter can be evenly applied to the pin surface more quickly, thereby reducing the preparation time of the rice transplanter operation.

[0033] Compared with the prior art, the technical solution provided by this application has the following beneficial effects:

[0034] 1. The butter distribution process in the present invention is to guide the butter from the oil outlet into the spiral groove, and then diffuse it to the circumference of the pin shaft. In essence, it is a butter distribution process from line to surface. Compared with the butter distribution process from point to surface in the prior art, in which the butter diffuses from the oil outlet to the surrounding area of ​​the hole and then to the circumference of the pin shaft, the butter distribution in the present invention is faster and more uniform. The diversion effect of the spiral groove further improves the butter distribution speed and uniformity, thereby quickly forming an oil film to lubricate and block mud and water, effectively reducing the time required to prepare the rice transplanter and improving the machine's operating efficiency.

[0035] 2. The combination of the oil storage tank and the spiral groove can make the circumference of the pin shaft have a double butter distribution process by line and surface, which is beneficial to improve the distribution speed and uniformity of the butter, further accelerate the formation of the oil film on the pin shaft surface, further reduce the preparation time before the transplanter operation, and improve the transplanting efficiency of the transplanter.

[0036] 3. The grease flows from the inside to the outside along the spiral groove, which can prevent muddy water from entering from the outside to the inside, thereby playing a role in blocking muddy water. At the same time, by refilling grease, the muddy water that enters can be squeezed out of the internal space of the pin assembly along the spiral groove.

[0037] 4. Multiple oil reservoirs provide a greater butter storage capacity, effectively reducing the frequency of butter refilling and further improving the efficiency of the rice transplanter. The waist-shaped hole in the pin plate allows mass-produced pin assemblies to be adapted to a wider range of installation locations and transplanter models, increasing product applicability and facilitating the improvement of existing transplanters. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of the pin shaft in Example 1 of the present utility model;

[0039] Figure 2 It is a structural wireframe diagram of the pin in Example 1 of the present utility model;

[0040] Figure 3 This is a schematic diagram of the axial cross-section of the pin structure in Example 1 of the present invention. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the axial cross-section of the pin structure in Example 1 of the present invention. Figure 2 ;

[0042] Figure 5 This is a schematic diagram of the assembly of the pin and the pin piece in Example 1 of the present utility model;

[0043] Figure 6 This is a schematic structural diagram of the pin piece in Example 1 of the present utility model;

[0044] Figure 7 This is a schematic diagram of the structure of the rotating sleeve in the pin assembly of Example 2 of the present utility model;

[0045] Figure 8 This is a schematic axial cross-sectional view of the rotating sleeve structure in the pin assembly of Example 2 of the present utility model;

[0046] Figure 9 This is a schematic axial cross-sectional view of the pin assembly of Example 2 of the present utility model;

[0047] Figure 10 This is a schematic diagram of the combination of the spiral groove and the oil storage tank in the pin assembly of Example 2 of the present utility model;

[0048] Figure 11 This is a schematic axial cross-sectional view of the pin assembly of Example 3 of the present utility model;

[0049] Figure 12 This is a side structural diagram of a rice transplanter according to a fourth embodiment of the present invention;

[0050] Figure 13 This is an exploded view of the connection between the frame and the lifting link mechanism in the rice transplanter of Example 4 of the present utility model;

[0051] Figure 14 This is a partial enlarged view of the frame connection portion of the rice transplanter in Example 4 of the present utility model;

[0052] Description of reference numerals:

[0053] 1-pin body 11-spiral groove 12-first oil outlet 13-grease filling port 14-oil storage chamber 15-second oil outlet 2-rotating sleeve 21-oil storage tank 2'-first rotating sleeve unit 2"-second rotating sleeve unit 3-grease nipple 4-frame 5-lifting linkage 6-fixing plate 61-nut 7-bolt 8-pin plate 81-waisted hole 82-connecting hole

[0054] Notice: Figure 1 、 Figure 10 The arrow in the figure indicates the direction of butter diffusion. DETAILED DESCRIPTION

[0055] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0061] Example 1

[0062] See Figure 1 Embodiment 1 of the present invention provides a pin shaft, including a spiral groove 11, an oil outlet hole (12; 15), a grease filling port 13, and an oil storage cavity 14.

[0063] Specifically, such as Figures 1 to 4As shown, the pin body 1 is a cylinder with an axially hollow structure, which serves as an oil storage chamber 14. A grease filling port 13 is provided on one end face of the pin body 1. The inner surface of the grease filling port 13 is provided with an internal thread, which cooperates with the external thread of the purchased grease nipple 3 for external connection to the grease nipple 3. A spiral groove 11 is provided on the cylindrical circumference of the pin body 1. Two oil outlet holes are provided in the spiral groove 11. The two oil outlet holes are provided near both ends of the pin body 1 and are connected to the oil storage chamber 14. They are the first oil outlet hole 12 and the second oil outlet hole 15 respectively. The two oil outlet holes are not on the same parallel line parallel to the central axis of the pin body 1, that is, the circumferential surfaces of the two oil outlet holes are staggered and provided on the circumferential surface of the pin body 1. The circumferential misalignment angle of the two oil outlet holes ranges from 90 to 180 degrees, that is, the angle formed by the orthographic projection of the two oil outlet holes on the end face of the pin body 1 and the center point of the end face with the center point of the end face as the vertex ranges from 90 to 180 degrees.

[0064] The grease filling port 13 can also be provided on the peripheral surface of the pin body 1 close to the end surface. No matter where the grease filling port 13 is provided, it can be communicated with the oil storage cavity 14 .

[0065] like Figure 5 and Figure 6 As shown, the end of the pin body 1 without the grease filling port 13 is fixedly connected to the connecting hole 82 of the pin piece 8. The pin piece 8 is also provided with a waist-shaped hole 81 for fixing the pin.

[0066] One end of the pin body 1 where the grease filling port 13 is provided can also be fixedly connected to the connecting hole 82 of the pin piece 8 .

[0067] When in use, butter is injected into the oil storage chamber 14 from the butter filling port 13. After the oil storage chamber 14 is filled, the butter continues to flow from the oil outlet hole (12; 15) along the spiral groove 11 to the peripheral surface of the pin body 1. Figure 1 As shown, this is a butter distribution process from line to surface, and the guiding effect of the spiral groove 11 makes the butter distribute faster along the spiral groove 11 on the circumference of the pin 1 and the distribution range is wider.

[0068] With two oil outlet holes, grease can flow from two locations to the spiral groove 11. This means that at the same filling pressure, the time required for grease filling is shortened. However, considering the bearing capacity of the pin and to avoid compromising its strength, it is not advisable to have too many oil outlet holes. Furthermore, staggered grease outlet holes can effectively prevent uneven grease distribution on the shaft surface compared to non-staggered grease outlet holes, further improving the speed and uniformity of grease distribution.

[0069] The shape of the waist-shaped hole 81 makes the installation position of the pin not unique, that is to say, the pins produced in batches can be applied to a wider range of installation positions or rice transplanting machine models, thereby improving the applicability of the product.

[0070] Example 2

[0071] like Figure 9 As shown, embodiment 2 of the present invention provides a pin assembly, including the pin in embodiment 1, and further including a rotating sleeve 2 sleeved on the pin and a grease nipple 3 screwed to the internal thread of the grease filling port 13. The grease nipple 3 can be a commercially available grease nipple.

[0072] Specifically, such as Figure 7 As shown, the rotating sleeve 2 is a cylindrical body with an axial hollow structure, and both ends of the hollow structure are open. Figure 8 As shown, the inner surface of the rotating sleeve 2 is provided with at least two oil storage grooves 21, and the oil storage grooves 21 are annular grooves.

[0073] When in use, the butter gathers from the spiral groove 11 to the oil storage tank 21 under the action of the filling pressure, and the filling of butter is stopped after the oil storage tank 21 is filled with butter. The shape formed by the combination of the oil storage tank 21 and the spiral groove 11 is as follows: Figure 10 As shown, the butter ring and butter spiral ring formed after filling with butter are also as shown in FIG. Figure 10 The shape shown, therefore, Figure 10 As shown, there are two butter distribution processes from line to surface in the pin surface area clamped by the butter ring and the butter spiral ring. The butter distribution speed is faster and the lubrication effect can be achieved faster.

[0074] At the same time, the rotating extrusion effect of the rotating sleeve 2 can also accelerate the butter coating on the peripheral surface of the pin.

[0075] During machine operation, grease can be further replenished from reservoir 21 to the circumference of the pin, compensating for grease loss and reducing the frequency of grease refilling. Grease filling reservoir 21 forms multiple grease rings, which act as a multi-layered defense against dust and muddy water, reducing wear on the pin assembly and extending its service life. Multiple reservoirs also provide a higher grease storage capacity, further reducing the frequency of grease refilling.

[0076] Example 3

[0077] Combine Figure 11As shown, the third embodiment of the present invention provides a pin assembly. The difference from the pin assembly of embodiment 2 is that the rotating sleeve in the pin assembly of embodiment 3 is divided into a first rotating sleeve unit 2' and a second rotating sleeve unit 2". In other words, the rotating sleeve 2 can be a whole or multiple parts. The two oil outlets in embodiment 3 are marked as the first oil outlet 12 and the second oil outlet 15, which are respectively wrapped by the two rotating sleeve units, that is, the first oil outlet 12 corresponds to the first rotating sleeve unit 2', and the second oil outlet 15 corresponds to the second rotating sleeve unit 2". When filling butter, fill the butter into the oil storage tanks 21 of the two rotating sleeve units from the two oil outlets respectively, and combine with the attached Figure 11 Specifically, butter is filled into the oil storage tank 21 of the first rotary sleeve unit 2 ′ from the first oil outlet 12 , and butter is filled into the oil storage tank 21 of the second rotary sleeve unit 2 ″ from the second oil outlet 15 .

[0078] A third oil outlet hole (not shown in the figure) is further provided in the spiral groove on the circumference of the pin shaft wrapped by the second rotating sleeve unit 2". The second oil outlet hole 15 and the third oil outlet hole are staggered and distributed on the circumference of the pin shaft.

[0079] A fourth oil outlet hole (not shown) may also be provided in the spiral groove on the circumference of the pin shaft wrapped by the first rotating sleeve unit 2 ′. The second oil outlet hole 15 and the fourth oil outlet hole are staggered and distributed on the circumference of the pin shaft.

[0080] This embodiment 3 is suitable for situations where two components need to be connected. When in use, in addition to achieving the effects of embodiment 2, the two rotating sleeves can also cooperate with each other. Under the pressure of rotation and extrusion, butter can flow from the rotating sleeve with more butter to the rotating sleeve with less butter, which can accelerate the distribution of butter and also help replenish consumed butter.

[0081] Example 4

[0082] Combine Figures 12-14 Embodiment 4 of the present invention provides a rice transplanter using the pin assembly described in embodiment 3. The rice transplanter includes a frame 4 and a planting portion, and the two portions are connected by a lifting link mechanism 5. The pin assembly is used to rotatably connect the frame 4 and the lifting link mechanism 5.

[0083] Specifically, the first rotating sleeve unit 2' is welded to the lifting link mechanism 5, and the second rotating sleeve unit 2" is welded to the frame 4. At the same time, a fixing plate 6 is welded on the frame 4 at the corresponding position of the second rotating sleeve unit 2", and a nut 61 is provided on the fixing plate 6. The other end of the pin 1 in the pin assembly, which is opposite to the end provided with the grease filling port 13, is welded to the connecting hole 81 of the pin plate 8. The pin plate 8 can serve as a limit device to fix the pin and prevent the pin from falling out from both sides of the lifting link mechanism 5.

[0084] During installation, align the second rotating sleeve unit 2" on the frame 4 with the first rotating sleeve unit 2' on the lifting link mechanism 5, insert the pin 1 into the first rotating sleeve unit 2' and the second rotating sleeve unit 2" at the same time. After insertion, align the waist-shaped hole 82 on the pin piece 8 with the threaded hole of the welding nut 61 on the fixing piece 6, and fix the pin by screwing the fastener bolt 7 that cooperates with the nut 61 to ensure that the pin and the two rotating sleeve units form a perfectly matched pin assembly.

[0085] Before the above-mentioned rice transplanter works, the butter can be quickly and evenly applied to the circumference of the pin shaft by simply adding butter. Even if there are local areas that are not applied properly, it is only necessary to lift the connecting rod mechanism 5 up and down once or twice. The rotational pressure generated by the relative rotational movement of the rotating sleeve and the pin shaft is used to quickly and evenly apply the butter to the circumference of the pin shaft and fill the gap between the pin shaft and the rotating sleeve, thereby improving the convenience and efficiency of applying butter and allowing the rice transplanter to quickly enter the operating state.

[0086] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A pin shaft, comprising a pin shaft body (1), wherein the pin shaft body (1) has a hollow oil storage cavity (14) and a grease filling port (13) connected to the oil storage cavity (14), and an oil outlet hole is opened on the peripheral surface of the pin shaft body (1), and the oil outlet hole is connected to the oil storage cavity (14), characterized in that: A spiral groove (11) is provided on the circumferential surface of the pin shaft body (1), and the spiral groove (11) is communicated with the oil storage cavity (14) through an oil outlet hole.

2. A pin according to claim 1, characterized in that: There are two oil outlet holes, which are respectively opened at two ends of the pin body (1). The two oil outlet holes are circumferentially staggered and distributed on the circumferential surface of the pin body (1).

3. A pin according to claim 2, characterized in that: The circumferential staggered angle of the two oil outlet holes is 180 degrees.

4. A pin according to any one of claims 1 to 3, characterized in that: One end of the pin shaft body (1) is fixedly connected to a pin shaft piece (8), and a waist-shaped hole (81) is also provided on the pin shaft piece (8).

5. A pin assembly, comprising a pin and a rotating sleeve (2), wherein the pin comprises a pin body (1), the pin body (1) having a hollow oil storage cavity (14) and a grease filling port (13) connected to the oil storage cavity (14), an oil outlet hole is provided on the circumference of the pin body (1), and the oil outlet hole is connected to the oil storage cavity (14), characterized in that: A spiral groove (11) is provided on the circumferential surface of the pin shaft body (1), and the spiral groove (11) is communicated with the oil storage chamber (14) through an oil outlet hole. The rotating sleeve (2) is sleeved on the pin shaft, and at least two annular oil storage grooves (21) are provided on the inner surface of the rotating sleeve (2).

6. The pin assembly according to claim 5, characterized in that: There are two oil outlet holes, namely a first oil outlet hole (12) and a second oil outlet hole (15). The two oil outlet holes are circumferentially staggered and distributed on the circumferential surface of the pin shaft body (1). The rotating sleeve (2) includes a first rotating sleeve unit (2') and a second rotating sleeve unit (2"), the first oil outlet hole (12) corresponds to the first rotating sleeve unit (2'), and the second oil outlet hole (15) corresponds to the second rotating sleeve unit (2").

7. The pin assembly according to claim 5, characterized in that: There are three oil outlet holes, namely a first oil outlet hole (12), a second oil outlet hole (15) and a third oil outlet hole. The second oil outlet hole (15) and the third oil outlet hole are adjacent to each other and are circumferentially staggered and distributed on the circumferential surface of the pin shaft body (1). The rotating sleeve (2) includes a first rotating sleeve unit (2') and a second rotating sleeve unit (2"), the first oil outlet hole (12) corresponds to the first rotating sleeve unit (2'), and the second oil outlet hole (15) corresponds to the third oil outlet hole and the second rotating sleeve unit (2").

8. The pin assembly according to any one of claims 5 to 7, characterized in that: The butter filling port (13) is provided with a butter nozzle (3).

9. A rice transplanter, comprising a frame (4), a pin assembly and a lifting link mechanism (5), wherein the frame (4) and the lifting link mechanism (5) are rotatably connected via the pin assembly, and wherein: The pin assembly is the pin assembly according to claim 6 or 7, the first rotating sleeve unit (2') is arranged on the lifting link mechanism (5), the second rotating sleeve unit (2") is arranged on the frame (4), and the pin is inserted into the first rotating sleeve unit (2') and the second rotating sleeve unit (2") at the same time.

10. The rice transplanter according to claim 9, characterized in that: One end of the pin shaft body (1) is fixedly connected to a pin shaft piece (8), and a waist-shaped hole (81) is further provided on the pin shaft piece (8). The frame (4) is provided with a fixing piece (6) at a position corresponding to the second rotating sleeve unit (2"), and a nut (61) is provided on the fixing piece (6). A bolt (7) threadedly connected to the nut (61) passes through the waist-shaped hole (81) and cooperates with the nut (61) to tighten the pin shaft.

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