A rotary cultivator with a multiple composite seal spindle bearing housing

Abstract

The utility model relates to agricultural machinery technical field especially a kind of rotary cultivator with multiple composite sealing cutter shaft bearing seat, bearing is installed on the journal of bearing seat body;The inner wall of outer sleeve is equipped with the labyrinth seal body matched with bearing seat body;Bearing seat body is equipped with the retainer ring matched with the labyrinth seal body on it;Double-layer sealing element is equipped on the bearing seat body between the labyrinth seal body and bearing, the labyrinth seal body and retainer ring form non-contact physical barrier, make silt under centrifugal force under the action of zigzag channel and throw out, intercept large particle impurities and grass clippings;Rhombic opening of double-layer sealing element self-adapting cutter shaft thermal deformation, always keep lip edge to fit, sealing bevel tooth generates one-way oil pumping effect, actively block mud and water penetration, while multiple protrusions enhance radial sealing pressure, realize mud change will zero invasion, in addition, ladder wall isolation, even if the labyrinth seal body fails, pollutants are still blocked outside bearing.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a rotary tiller with a multi-composite sealed cutter shaft bearing seat. Background Technology

[0002] A rotary tiller is a type of tillage machine driven by a tractor or other power machinery that uses rotating blades to break and mix the soil for tillage. It is widely used in agricultural land preparation and is an important tool for soil cultivation, replacing traditional plows (such as moldboard plows and disc plows).

[0003] The rotary tiller cutter shaft bearing housing is a very important component of the rotary tiller. It not only supports the cutter shaft and ensures its stable rotation, but also protects the bearing from external impurities.

[0004] The existing rotary tiller cutter shaft bearing housing typically uses a single-layer seal ring, a design with significant shortcomings. These shortcomings are specifically manifested in the following aspects:

[0005] 1. Poor sealing performance: Single-layer sealing rings are insufficient to effectively block external particles and mud in complex farmland environments. Especially in paddy fields and dry land operations, impurities such as mud and weeds can easily enter the bearing housing, leading to accelerated bearing wear and a significant reduction in service life.

[0006] 2. Lack of obstruction structure: The existing bearing housing seals rely solely on sealing rings, allowing particles or mud to easily pass through and enter the bearing housing. This not only affects the normal operation of the bearing but may also cause it to seize, thus impacting the overall performance of the rotary tiller.

[0007] 3. High maintenance costs: Due to poor sealing, the bearings need to be replaced frequently, which not only increases maintenance costs but also reduces the operating efficiency of the rotary tiller.

[0008] To address the aforementioned issues, it is necessary to improve the sealing technology of existing rotary tiller cutter shaft bearing housings to enhance their sealing performance and service life. Utility Model Content

[0009] The technical problem to be solved by this utility model is: in order to solve the problems existing in the prior art in the background art, a rotary tiller with a multi-composite sealed cutter shaft bearing seat is provided.

[0010] The technical solution adopted by this utility model to solve its technical problem is: a rotary tiller with a multi-composite sealed cutter shaft bearing seat, including cutter shaft bearing seats installed at both ends of the cutter shaft, wherein the cutter shaft bearing seat includes a bearing seat body and an outer protective sleeve covering the bearing seat body;

[0011] A bearing is mounted on the journal of the bearing housing body;

[0012] The inner wall of the outer sheath is provided with a labyrinth seal that mates with the bearing housing body;

[0013] The bearing housing body is fitted with a retaining ring that mates with the labyrinth seal.

[0014] A double-layer seal is fitted on the bearing housing body between the labyrinth seal and the bearing.

[0015] Furthermore, the double-layer seal includes a sealing ring body, which includes a main ring and a sealing lip ring concentrically connected within the main ring. The sealing lip ring has a diamond-shaped opening in the middle, which divides the sealing lip ring into two symmetrical parts.

[0016] Each part includes a lip, and the bottom inner ring of the lip is provided with a number of sealing oblique teeth, the tips of the sealing oblique teeth are set inward at an angle, and the bottom outer ring of the lip is provided with sealing straight teeth.

[0017] Multiple protrusions are provided on the outer edge of the top surface of the lip.

[0018] Furthermore, the vertical cross-sectional shape of the sealing ring body is "I-shaped", and a skeleton is provided inside the sealing ring body.

[0019] Furthermore, there are two protrusions, one with a flat top surface and the other with an arc-shaped top surface.

[0020] Furthermore, one end of the outer sheath has a stepped inner cavity, and the other end of the outer sheath has a groove. A labyrinth seal is located between the stepped inner cavity and the groove.

[0021] The vertical cross-sectional shape of the labyrinth seal is inverted L-shaped. The crossbar of the labyrinth seal divides the bottom of the groove to form an annular groove. The retaining ring extends into the annular groove. The labyrinth seal has an L-shaped mounting groove, which mates with the shaft shoulder on the bearing housing body.

[0022] The stepped inner cavity has multiple stepped cavities, with the bearing located in the outer stepped cavity and the double-layer seal located in the inner stepped cavity.

[0023] Furthermore, a cover plate is installed on the side of the outer sheath.

[0024] Furthermore, the shaft of the cutter shaft is equipped with several sets of rotary tiller blades, which are arranged in a circular array. Each set of rotary tiller blades consists of several rotary tiller blades, which are connected to each other by reinforcing plates.

[0025] Furthermore, it also includes a cover, which covers the cutter shaft, a drive motor is mounted on the cover, a gearbox is mounted on one end of the cover, one end of the cutter shaft is connected to the gearbox, and the output end of the drive motor is connected to the gearbox to drive the cutter shaft to rotate through the gearbox.

[0026] Furthermore, a connecting frame is installed on the cover for connecting to the rear of the agricultural tractor.

[0027] Furthermore, a mudguard is movably mounted on the cover, and a guide rod is installed between the cover and the mudguard, with a spring sleeved on the guide rod.

[0028] The beneficial effects of this utility model are: the labyrinth-type sealing body and the retaining ring of this utility model form a non-contact physical barrier, and the mud and sand are thrown out under the action of centrifugal force through the tortuous channel, intercepting large particles of impurities and grass clippings.

[0029] The diamond-shaped opening of the double-layer seal adapts to the thermal deformation of the cutter shaft, always maintaining lip contact. The sealing helical teeth generate a one-way pumping effect, actively blocking mud and water penetration. At the same time, multiple protrusions enhance the radial sealing pressure, achieving zero intrusion of mud and water during replacement. In addition, the stepped wall isolation ensures that even if the labyrinth seal fails, contaminants are still blocked outside the bearing.

[0030] This upgrades the protection level of the rotary tiller cutter shaft bearing from passive defense to active defense, ensuring good sealing, eliminating the need for frequent bearing replacement, reducing maintenance costs, and improving operational efficiency. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a utility model Figure 1 A structural diagram from another direction;

[0034] Figure 3 This is a cross-sectional view of the present invention;

[0035] Figure 4 This is a partial enlarged view of point A in this utility model;

[0036] Figure 5 This is a structural schematic diagram of the double-layer sealing component of this utility model;

[0037] Figure 6 This is a schematic diagram of the structure of the outer sheath of this utility model;

[0038] In the diagram: 1. Bearing housing body,

[0039] 2. Outer sheath; 21. Outer stepped cavity; 23. Annular groove; 24. Intermediate stepped cavity.

[0040] 3. Bearings

[0041] 4. Labyrinth seal, 41. Crossbar, 42. L-shaped mounting groove.

[0042] 5. Retaining ring; 6. Double-layer seal; 61. Seal ring body; 611. Main ring; 612. Seal lip; 6121. Seal helical teeth; 6122. Seal straight teeth; 6123. Protrusion.

[0043] 613. Rhomboid opening,

[0044] 7. Rotary tiller blade assembly, 8. Reinforcing plate, 9. Cover plate, 10. Housing, 11. Drive motor, 12. Gearbox, 13. Connecting frame, 14. Mudguard, 15. Guide rod, 16. Spring. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0046] like Figures 1-6 The rotary tiller shown includes a multi-composite sealed cutter shaft bearing housing, comprising cutter shaft bearing housings installed at both ends of the cutter shaft. The cutter shaft bearing housing includes a bearing housing body 1 and an outer sleeve 2 covering the bearing housing body 1. The bearing housing body 1 is the core body that carries the bearing and the cutter shaft, transmits torque and distributes the load to the frame. A cover plate 9 is installed on the side of the outer sleeve 2 to close the side opening of the outer sleeve 2, which facilitates the maintenance of the bearing 3 and the double-layer seal 6, and at the same time prevents external splashing. The outer sleeve 2, the bearing housing body 1 and the cover plate 9 form a sealed cavity.

[0047] A bearing 3 is mounted on the journal of the bearing housing body 1;

[0048] The inner wall of the outer sheath 2 is provided with a labyrinth seal 4 that cooperates with the bearing housing body 1. The labyrinth seal prevents the intrusion of mud and water vapor through the tortuous channel. The labyrinth seal path is designed to increase the difficulty for impurities and moisture to enter the bearing housing.

[0049] The bearing housing body 1 is fitted with a retaining ring 5 that cooperates with the labyrinth seal 4. The labyrinth seal 4 and the retaining ring 5 cooperate to form the first physical barrier.

[0050] A double-layer seal 6 is fitted on the bearing housing body 1 between the labyrinth seal 4 and the bearing 3. The contact seal provides a good sealing effect and prevents mud, water and particles from penetrating into the bearing 3.

[0051] like Figure 5As shown, the double-layer seal 6 includes a sealing ring body 61, which includes a main ring 611 and a sealing lip ring 612 concentrically connected within the main ring 611. The sealing lip ring 612 has a diamond-shaped opening 613 in the middle. The diamond-shaped opening 613 adapts to the thermal expansion and contraction deformation of the cutter shaft, keeping the sealing lip ring 612 in contact. The diamond-shaped opening 613 divides the sealing lip ring 612 into two symmetrical parts.

[0052] Each part includes a lip, and the bottom inner ring of the lip is provided with a plurality of sealing helical teeth 6121. The tips of the sealing helical teeth 6121 are inclined inward to form a one-way oil pumping effect and block external mud and water. The bottom outer ring of the lip is provided with sealing straight teeth 6122 to enhance radial sealing pressure.

[0053] Multiple protrusions 6123 are provided on the outer edge of the top surface of the lip. There are two protrusions 6123, one of which has a flat top surface and the other has an arc-shaped top surface, which improves the interference seal with the inner wall of the outer sheath 2.

[0054] like Figure 5 As shown, the vertical cross-sectional shape of the sealing ring body 61 is "I-shaped". The sealing ring body 61 has a skeleton inside, which is resistant to deformation, high pressure, and extends service life.

[0055] like Figure 6 As shown, one end of the outer sheath 2 has a stepped inner cavity, and the other end of the outer sheath 2 is provided with a groove. The labyrinth seal 4 is located between the stepped inner cavity and the groove.

[0056] The vertical cross-sectional shape of the labyrinth seal 4 is inverted L-shaped, and the dividing groove forms a double-channel labyrinth, which improves the sealing level;

[0057] The crossbar 41 of the labyrinth seal 4 divides the bottom of the settling tank to form an annular groove 23. The retaining ring 5 is fixed on the bearing housing body 1. The retaining edge of the retaining ring 5 extends into the annular groove 23. The labyrinth seal 4 and the retaining ring 5 cooperate to form a labyrinth channel, intercepting large particles of impurities and enhancing dustproof capability. The labyrinth seal 4 achieves dynamic dustproofing in the rotating state.

[0058] The labyrinth seal 4 has an L-shaped mounting groove 42, which mates with the shaft shoulder on the bearing housing body 1.

[0059] The stepped inner cavity has multiple stepped cavities, forming independent sealed chambers. The bearing 3 is located in the outer stepped cavity 21, and the double-layer seal 6 is located in the inner stepped cavity 24.

[0060] .like Figures 1-3 As shown, the shaft of the cutter shaft is equipped with several sets of rotary tiller blades 7, which are arranged in a circular array to ensure uniform soil breaking and reduce the eccentric load on the cutter shaft.

[0061] Each set of rotary tillers 7 consists of several rotary tillers, which are connected as one unit by reinforcing plates 8 to improve the rigidity of the rotary tillers and reduce the impact of operating vibration on the bearings 3.

[0062] It also includes a cover 10 to protect the cutter shaft and transmission components and prevent straw from getting tangled. The cover 10 covers the cutter shaft and a drive motor 11 is installed on the cover 10. A gearbox 12 is installed at one end of the cover 10. One end of the cutter shaft is connected to the gearbox 12. The output end of the drive motor 11 is connected to the gearbox 12 to drive the cutter shaft to rotate through the gearbox 12.

[0063] The cover 10 is equipped with a connecting bracket 13, which is adapted to the three-point suspension system of the tractor and is used to connect to the rear of the agricultural tractor to achieve quick attachment of the whole machine.

[0064] like Figure 2 As shown, a mudguard 14 is movably mounted on the cover 10, and a guide rod 15 is installed between the cover 10 and the mudguard 14. A spring 16 is sleeved on the rod of the guide rod 15, and the mudguard 14 forms a floating mudguard. The spring 16 adapts to the terrain and prevents mud from splashing and clogging the sealing structure of the cutter shaft bearing seat.

[0065] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A rotary tiller with a multi-layered composite sealed cutter shaft bearing housing, characterized in that: Includes cutter shaft bearing seats installed at both ends of the cutter shaft, the cutter shaft bearing seats including bearing seat body (1) and outer sleeve (2) covering the bearing seat body (1); A bearing (3) is mounted on the journal of the bearing housing body (1); The inner wall of the outer sheath (2) is provided with a labyrinth seal (4) that cooperates with the bearing housing body (1); A retaining ring (5) that matches the labyrinth seal (4) is fitted on the bearing housing body (1); A double-layer seal (6) is fitted on the bearing housing body (1) between the labyrinth seal (4) and the bearing (3).

2. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 1, characterized in that: The double-layer seal (6) includes a sealing ring body (61), the sealing ring body (61) includes a main ring (611) and a sealing lip ring (612) concentrically connected in the main ring (611), the sealing lip ring (612) has a diamond-shaped opening (613) in the middle, the diamond-shaped opening (613) divides the sealing lip ring (612) into two symmetrical parts; Each part includes a lip, and the inner circle of the bottom surface of the lip is provided with a plurality of sealing oblique teeth (6121), the tips of the sealing oblique teeth (6121) are inclined inward, and the outer circle of the bottom surface of the lip is provided with sealing straight teeth (6122). Multiple protrusions (6123) are provided at the outer edge of the top surface of the lip.

3. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 2, characterized in that: The vertical cross-sectional shape of the sealing ring body (61) is "I-shaped", and the sealing ring body (61) has a skeleton inside.

4. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 2, characterized in that: The number of protrusions (6123) is two, one of which has a flat top surface and the other has an arc-shaped top surface.

5. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 1, characterized in that: The outer sheath (2) has a stepped inner circle at one end, and a groove at the other end. The labyrinth seal (4) is located between the stepped inner cavity and the groove. The vertical cross-sectional shape of the labyrinth seal (4) is an inverted L-shape. The crossbar (41) of the labyrinth seal (4) divides the bottom of the sink into an annular groove (23). The retaining edge of the retaining ring (5) extends into the annular groove (23). The labyrinth seal (4) has an L-shaped mounting groove (42). The L-shaped mounting groove (42) mates with the shoulder on the bearing housing body (1). The stepped inner cavity has multiple stepped cavities, with the bearing (3) located in the outer stepped cavity (21) and the double-layer seal (6) located in the inner stepped cavity (24).

6. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 1, characterized in that: The outer sheath (2) is fitted with a cover plate (9) on its side.

7. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 1, characterized in that: The shaft of the blade shaft is provided with several sets of rotary tillage blades (7). The rotary tillage blades (7) are arranged in a ring array. Each set of rotary tillage blades (7) consists of several rotary tillage blades. The rotary tillage blades are connected to each other by reinforcing plates (8).

8. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 1, characterized in that: It also includes a cover (10) which covers the cutter shaft. A drive motor (11) is installed on the cover (10). A gearbox (12) is installed at one end of the cover (10). One end of the cutter shaft is connected to the gearbox (12). The output end of the drive motor (11) is connected to the gearbox (12) to drive the cutter shaft to rotate through the gearbox (12).

9. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 8, characterized in that: The cover (10) is equipped with a connecting frame (13) for connecting to the rear of an agricultural tractor.

10. A rotary tiller with a multi-composite sealed cutter shaft bearing housing according to claim 8, characterized in that: A mudguard (14) is movably installed on the cover (10), and a guide rod (15) is installed between the cover (10) and the mudguard (14). A spring (16) is sleeved on the body of the guide rod (15).

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