Labyrinth type sealing structure for driven carrier roller of soil feeding chain of full-film-mulching seeder

Abstract

The utility model relates to the technical field of film-covering seeding machines, in particular to a labyrinth type sealing structure for a driven carrier roller of a soil feeding chain of a full-film-covering seeding machine, which comprises a carrier roller shell, bearing glands are movably mounted at the upper end and the lower end of the carrier roller shell, and nylon sealing sleeves are fixedly mounted on the bearing glands. A carrier roller shaft is rotationally installed in the nylon sealing sleeve and fixedly installed on the nylon sealing sleeve in an interference fit mode, external threads are formed in the side wall of the carrier roller shaft, a threaded hole is formed in one end of the carrier roller shaft, and an oil seal is fixedly installed in the bearing gland. A labyrinth sealing assembly is installed between the bearing gland and the nylon sealing sleeve, and the bearing gland comprises a sealing ring and a fixing ring. According to the utility model, the gap between the carrier roller shaft and the bearing gland is hidden in the sealing structure, so that dust, sundries and the like cannot be in direct contact with the gap between the carrier roller shaft and the bearing gland, and the possibility that the dust, the sundries and the like enter the carrier roller is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mulched seeders, specifically to a labyrinth-type sealing structure for a soil chain driven roller on a fully mulched seeder. Background Technology

[0002] Currently, the soil-laying chain of full-film film machines on the market is driven by a drive sprocket, and the driven wheel uses a roller to support the chain and control the chain tension. The driven roller structure generally consists of two bearings installed inside the roller housing, with the roller shaft mounted on the bearings. The bearings are positioned by bearing covers, and the roller shaft is fixed to the frame on both sides through the bearing covers. In order to ensure the normal rotation of the roller, there must be a certain gap between the roller shaft and the bearing covers. Due to the poor working environment during sowing, there is a lot of dust, straw, stubble, residual film and other debris in the soil. When the roller rotates, dust and various debris will enter the inside of the roller through the gap between the roller shaft and the bearing covers, damaging the oil seal, bearings and other components in turn, thus causing roller failure and making the entire transmission system unable to operate normally.

[0003] According to the patent document with publication number CN222141811U, a soil chain driven idler roller oil injection and pressure relief structure for a full-film seeder includes an idler roller shell, a bearing inside the idler roller shell, an idler roller shaft passing through the bearing, and pressure caps bolted to both ends of the idler roller shell. The idler roller shaft passes through the pressure caps and is rotatably connected to them. The idler roller shaft has an axial hole and a radial hole inside, which are connected to each other. A threaded mounting hole is provided at the end of the idler roller shaft, which is connected to the axial hole. The structure also includes an oil injection cup and a pressure relief valve. An oil seal is embedded inside the pressure cap and fits against the end of the bearing. The idler roller shaft passes through the oil seal and is slidably connected to it. By using an oil seal, the sealing between the gland, the idler shaft, and the idler housing can be guaranteed. This technical solution involves a double-sided opening on the idler shaft, with axial and radial holes on each side, ensuring they communicate with each other. The axial holes on both sides are not connected, and the axes of the two radial holes are distributed at 90°. The idler shaft has threaded mounting holes for a straight-through grease cup and a pressure relief valve on both sides. This design, with a straight-through grease cup on one end and a pressure relief valve on the other, allows for easy addition of grease to the driven idler, improving reliability and extending service life. The pressure relief valve not only expels air from the idler housing but also indicates whether the amount of grease added is appropriate. However, while this solution allows for easy grease injection by expending air through the pressure relief valve, it cannot effectively seal the gap between the idler shaft and the bearing gland during use.

[0004] Therefore, a labyrinth-type sealing structure for the driven idler roller of the soil chain on a fully film-covered seeder is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a labyrinth-type sealing structure for a soil chain driven idler roller on a full-film seeder. The structure includes an idler roller shell, with bearing caps movably mounted at both the upper and lower ends of the idler roller shell. A nylon sealing sleeve is fixedly mounted on the bearing cap, and an idler roller shaft is rotatably mounted inside the nylon sealing sleeve. The idler roller shaft has external threads on its side wall and a threaded hole at one end.

[0006] Preferably, an oil seal is fixedly installed inside the bearing cap, and a labyrinth seal assembly is installed between the bearing cap and the nylon sealing sleeve.

[0007] Preferably, the bearing cap includes a sealing ring and a fixing ring, and the sealing ring and the fixing ring are integrally formed, with an annular groove formed between the sealing ring and the fixing ring.

[0008] Preferably, a convex ring is fixed on one side of the nylon sealing sleeve. The convex ring and the nylon sealing sleeve are integrally constructed. The convex ring is movably installed inside the ring groove. The nylon sealing sleeve is fixed to the idler roller shaft by an interference fit.

[0009] Preferably, the bearing cover has a fixing hole, and a fixing bolt is rotatably installed inside the fixing hole, with one end of the fixing bolt rotatably installed on the roller shell.

[0010] Compared with the prior art, this utility model provides a labyrinth-type sealing structure for the driven idler roller of the soil chain in a full-film seeder, which has the following beneficial effects:

[0011] 1. This utility model, by concealing the gap between the idler roller shaft and the bearing cover within a sealed structure, prevents dust, debris, and other contaminants from directly contacting the gap between the idler roller shaft and the bearing cover, thereby reducing the possibility of them entering the interior of the idler roller.

[0012] 2. This utility model adds a nylon sealing sleeve, which is lightweight and has good wear resistance. When it is fitted with the bearing cover, it forms a very small tortuous gap, forming a labyrinth-like sealing channel, which prevents dust, debris and other objects from entering the interior of the idler roller and extends the service life of the idler roller. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a side view of the structure of the device according to this utility model;

[0015] Figure 3 This is a side cross-sectional structural schematic diagram of the present invention;

[0016] Figure 4 This is a schematic diagram of the bearing cap structure of this utility model;

[0017] Figure 5 This is a schematic diagram of the nylon sealing sleeve of this utility model;

[0018] Figure 6 This is a three-dimensional structural diagram of the bearing cap of this utility model.

[0019] In the diagram: 1. Idler roller housing; 2. Bearing cap; 3. Nylon sealing sleeve; 4. Idler roller shaft; 5. Oil seal; 6. Labyrinth seal assembly; 7. Sealing ring; 8. Retaining ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example:

[0022] Please see Figure 1 - Figure 6 The embodiment of the soil chain driven idler labyrinth sealing structure of a full-film seeder includes an idler shell 1, bearing caps 2 are movably installed at both the upper and lower ends of the idler shell 1, nylon sealing sleeves 3 are fixedly installed on the bearing caps 2, an idler shaft 4 is rotatably installed inside the nylon sealing sleeves 3, the side wall of the idler shaft 4 has external threads, and one end of the idler shaft 4 has a threaded hole; an oil seal 5 is fixedly installed inside the bearing caps 2, and a labyrinth sealing assembly 6 is installed between the bearing caps 2 and the nylon sealing sleeves 3;

[0023] The nylon sealing sleeve 3 is made of nylon and its inner diameter is interference-fitted with the idler roller shaft 4. It is installed on the idler roller shaft 4. One side of the nylon sealing sleeve 3 is flat and contacts the main frame, fixing the nylon sealing sleeve 3 so that it does not move left or right. The other side is grooved, and the bottom plane of the groove contacts the shoulder of the idler roller shaft 4 to position the nylon sealing sleeve 3. Its outer edge extends into the groove of the bearing cover 2, thereby forming a very small tortuous gap to achieve sealing.

[0024] Please see Figure 3 and Figure 6 The bearing cap 2 includes a sealing ring 7 and a fixing ring 8, and the sealing ring 7 and the fixing ring 8 are integrally constructed. An annular groove is formed between the sealing ring 7 and the fixing ring 8. A convex ring is fixed on one side of the nylon sealing sleeve 3. The convex ring and the nylon sealing sleeve 3 are integrally constructed. The convex ring is movably installed inside the annular groove. The nylon sealing sleeve 3 is fixed on the idler roller shaft 4 by interference fit. A fixing hole is formed on the bearing cap 2. A fixing bolt is rotatably installed inside the fixing hole. One end of the fixing bolt is rotatably installed on the idler roller shell 1.

[0025] During operation, the idler roller shaft 4 and the nylon sealing sleeve 3 do not rotate, while the idler roller shell 1 and the bearing cover 2 rotate. A groove is designed on the outer plane of the bearing cover 2, and the size of the groove is designed according to the fit clearance of the nylon sealing sleeve 3.

[0026] Working principle:

[0027] During operation, the idler shaft 4 and the nylon sealing sleeve 3 do not rotate, while the idler housing 1 and the bearing cover 2 rotate. The nylon sealing sleeve 3 is made of nylon and its inner diameter is interference-fitted with the idler shaft 4. It is installed on the idler shaft 4. One side of the nylon sealing sleeve 3 is flat and contacts the main frame, fixing the nylon sealing sleeve 3 so that it does not move left or right. The other side is grooved, and the bottom plane of the groove contacts the shoulder of the idler shaft 4 to position the nylon sealing sleeve 3. The outer edge of the groove extends into the groove of the bearing cover 2, thereby forming a very small tortuous gap to achieve sealing. The bearing cover 2 and the idler housing 1 are fixedly connected by fixing bolts. By hiding the gap between the idler shaft 4 and the bearing cover 2 in the sealing structure, dust, debris and other objects cannot directly contact the gap between the idler shaft 4 and the bearing cover 2, reducing the possibility of them entering the interior of the idler housing 1.

[0028] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A labyrinth-type sealing structure for a soil chain driven idler roller on a full-film mulching seeder, characterized in that: Includes a roller shell (1), with bearing caps (2) movably installed at both the upper and lower ends of the roller shell (1), and a nylon sealing sleeve (3) fixedly installed on the bearing caps (2). A roller shaft (4) is rotatably installed inside the nylon sealing sleeve (3). The side wall of the roller shaft (4) has external threads, and one end of the roller shaft (4) has a threaded hole.

2. The labyrinth-type sealing structure of the driven idler roller on the soil chain of a full-film seeder according to claim 1, characterized in that: An oil seal (5) is fixedly installed inside the bearing cap (2), and a labyrinth seal assembly (6) is installed between the bearing cap (2) and the nylon sealing sleeve (3).

3. The labyrinth-type sealing structure of the soil chain driven idler roller in a fully film-covered seeder according to claim 2, characterized in that: The bearing cap (2) includes a sealing ring (7) and a fixing ring (8), and the sealing ring (7) and the fixing ring (8) are integrally formed, with an annular groove between the sealing ring (7) and the fixing ring (8).

4. The labyrinth-type sealing structure of the driven idler roller on the soil chain of a full-film seeder according to claim 3, characterized in that: A convex ring is fixed on one side of the nylon sealing sleeve (3). The convex ring and the nylon sealing sleeve (3) are integrally constructed. The convex ring is movably installed inside the ring groove. The nylon sealing sleeve (3) is fixed on the idler roller shaft (4) by interference fit.

5. The labyrinth-type sealing structure of the driven idler roller on the soil chain of a full-film seeder according to claim 1, characterized in that: The bearing cover (2) has a fixing hole, and a fixing bolt is rotatably installed inside the fixing hole. One end of the fixing bolt is rotatably installed on the roller shell (1).

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