Maintenance-free self-aligning roller bearing seat

Abstract

The invention relates to the technical field of bearing seats, and discloses a maintenance-free self-aligning roller bearing seat which comprises an upper cover, a base and a sealing air bag, the upper cover comprises an upper cover closing plate and an upper bearing cavity, the base comprises a lower cover closing seat and a lower bearing cavity, and the upper cover closing plate and the lower cover closing seat are detachably combined; an upper sealing groove formed along the edge of the upper cover closing plate is formed in the upper cover closing plate, a lower sealing groove formed along the edge of the lower cover closing seat is formed in the lower cover closing seat, the upper sealing groove and the lower sealing groove are detachably combined, and a sealing cavity is formed after the upper sealing groove and the lower sealing groove are combined. The sealing air bag is arranged in the sealing cavity and stretches across the joint face of the upper sealing groove and the lower sealing groove. The sealing structure has the advantages that the sealing structure is suitable for a vibration environment, and the sealing failure between the joint surfaces of the upper end cover and the lower end cover of the bearing seat caused by the looseness of the bolt can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of bearing seats, and in particular to a maintenance-free spherical roller bearing seat. Background Art

[0002] On the belt conveyor used for coal transportation, a sealed spherical roller bearing is usually used. When installing, the bearing is first installed on the shaft, and then the bearing seat is installed. When installing the bearing seat, the bearing seat contacts the outer ring, the outer ring will be offset, and the bearing seal ring is easy to fall off and be damaged. Therefore, the prior art adopts a split bearing seat structure. When installing, the lower bearing seat supports the bearing, and the upper bearing seat is installed from the top of the bearing and fixed with screws, which can effectively prevent the bearing seal ring from falling off and being damaged.

[0003] However, during the coal transportation process of the belt conveyor, vibration can easily loosen the fixing screws of the upper and lower end covers, resulting in poor sealing of the upper and lower end covers of the bearings. Dust can easily invade the bearing chamber, causing the lubricating oil in the bearing chamber to gradually deteriorate, resulting in poor lubrication and accelerated wear of the bearing seat. In severe cases, the normal operation of the belt conveyor cannot be maintained and the machine must be shut down for inspection and replacement of the bearing seat.

[0004] In summary, there is an urgent need for a maintenance-free bearing seat that is suitable for use in a vibration environment and can prevent bolt loosening from causing sealing failure between the joint surfaces of the upper and lower end covers of the bearing seat. Summary of the invention

[0005] In view of the sealing problem of the upper and lower end covers of the bearing in the prior art, a maintenance-free bearing seat suitable for use in a vibration environment is proposed to avoid the sealing failure between the joint surfaces of the upper and lower end covers of the bearing seat caused by loose bolts.

[0006] In order to solve the above problems, the technical solution of the present invention is: A maintenance-free spherical roller bearing seat, comprising an upper cover, a base, and a sealing airbag, the upper cover comprising an upper closing cover plate and an upper bearing cavity, the upper closing cover plates are provided on both sides of the upper bearing cavity, the base comprises a lower closing cover seat and a lower bearing cavity, the lower closing cover seat is provided on both sides of the lower bearing cavity, the upper closing cover plate and the lower closing cover seat are detachably matched; the upper closing cover plate is provided with an upper closed groove arranged along the edge of the upper closing cover plate, the lower closing cover seat is provided with a lower closed groove arranged along the edge of the lower closing cover seat, the upper closed groove and the lower closed groove are detachably matched, and the upper closed groove and the lower closed groove form a closed cavity after being matched, the sealing airbag is arranged in the closed cavity, and the sealing airbag spans the joint surface of the upper closed groove and the lower closed groove; an elastic extrusion piece is provided in the lower closed groove, wherein the elastic extrusion piece is elastically connected to the bottom of the lower closed groove for extruding the sealing airbag.

[0007] As a preferred technical solution, an upper half seal installation groove is provided in the upper bearing cavity, and the end of the upper closed groove is located outside the upper half seal installation groove.

[0008] As a preferred technical solution, a lower half seal installation groove is provided in the lower bearing cavity, and the end of the lower closed groove is located outside the lower half seal installation groove.

[0009] As a preferred technical solution, the elastic extrusion member includes a spring block and a locking plate. The spring block is elastically connected to the bottom of the lower closed groove, and the locking plate is used to control the initial position of the spring block.

[0010] As a preferred technical solution, the locking plate includes a locking end and a triggering end, the locking end is detachably connected to the upper surface of the spring block, and the triggering end is located in the bolt hole.

[0011] As a preferred technical solution, it also includes a fastening bolt for fixing the upper cover and the base, and the fastening bolt is adaptively connected to the bolt hole, wherein the fastening bolt changes the position of the locking end by changing the position of the trigger end.

[0012] As a preferred technical solution, a roller structure is provided on the locking end, and the spring block has a side wall surface that can contact and move relatively with the roller structure.

[0013] Beneficial effects of the present invention: 1. The maintenance-free spherical roller bearing seat of the present invention is provided with a sealing cavity composed of an upper closed groove and a lower closed groove along the edge of the split surface connecting the upper cover and the base, and a sealing airbag is provided in the sealing cavity. The dimensions of the sealing airbag in various directions are slightly smaller than the dimensions of the sealing cavity in various directions, so that when the upper cover and the base are installed, the sealing airbag will not be deformed, thereby affecting the seal between the upper cover and the base. An elastic extrusion piece is provided in the lower closed groove on the base, which can squeeze the sealing airbag in the sealing cavity after the upper cover and the base are combined, so that the sealing airbag is deformed, fills the entire sealing cavity, and blocks the gap between the upper cover and the base. At the same time, when the upper cover and the base have a gap due to loosening of the bolts in a vibrating environment, the sealing airbag will continue to deform under the action of the elastic extrusion piece to block the corresponding gap, thereby preventing pollutants from entering the bearing cavity from the gap at the split between the upper cover and the base.

[0014] 2. The elastic extrusion member of the maintenance-free spherical roller bearing seat of the present invention comprises a spring block and a locking plate. The locking end on the locking plate is used to engage the spring block in the initial state to keep it in a compressed state, thereby ensuring that the sealing airbag is not squeezed when the upper cover and the base are combined. The trigger end on the locking plate is located in the bolt hole used to connect the fastening bolt. When the fastening bolt enters the bolt hole and pushes the trigger end, the position of the trigger end is changed to be engaged between the threads on the fastening bolt. At this time, the torsion spring on the locking plate can provide a stable lateral extrusion force for the fastening bolt to prevent the fastening bolt from shaking in a vibration environment and causing the bolt to loosen. At the same time, when the bolt is loosened, the upwardly rotating threads and the rising fastening bolt will drive the trigger end to move upward, and the locking end of the locking plate will resist the side wall of the spring block at this time, resulting in the trigger end of the locking plate hindering the upward movement of the fastening bolt, further preventing the bolt from loosening, thereby avoiding the generation of contaminants from the gap between the upper cover and the base. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the maintenance-free spherical roller bearing seat of the present invention; Figure 2 This is a schematic diagram of the upper cover of the maintenance-free spherical roller bearing seat of the present invention; Figure 3 A schematic diagram of the base of the maintenance-free spherical roller bearing seat of the present invention; Figure 4 for Figure 3 An enlarged schematic diagram of the middle section A; Figure 5 A schematic diagram of the elastic extrusion component of the maintenance-free spherical roller bearing seat of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of the middle B area; Figure 7 This is a cross-sectional view of the sealing airbag and the base of the maintenance-free spherical roller bearing seat of the present invention; Figure 8 It is a schematic diagram of the locking end of the maintenance-free spherical roller bearing seat of the present invention being disengaged; Fig. 9 This is a schematic diagram of the sealing gap of the sealing airbag of the maintenance-free spherical roller bearing seat of the present invention.

[0016] The reference numerals and components involved in the drawings are as follows: 1. Upper cover; 2. Base; 3. Sealing airbag; 4. Fastening bolts; 5. Bolt holes; 6. Elastic extrusion piece; 11. Upper bearing cavity; 12. Upper closing cover plate; 21. Lower closing cover seat; 22. Lower bearing cavity; 23. Mounting position; 61. Spring block; 62. Locking plate; 111. Upper bearing mounting groove; 112. Upper sealing component mounting groove; 121. Upper closed groove; 211. Lower closed groove; 221. Lower bearing mounting groove; 222. Lower sealing component mounting groove; 621. Locking end; 622. Trigger end; 623. Roller structure. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to better understand the maintenance-free spherical roller bearing seat provided in this embodiment, the existing maintenance-free spherical roller bearing seat is first briefly introduced below. The existing spherical roller bearings with cylindrical holes and tapered holes are usually adapted to split bearing seats, which mainly bear radial loads. This type of split bearing seat equipped with a spherical roller bearing is often used in conveying systems. It includes a detachable upper cover and a base, and is usually made of materials such as cast steel, aluminum alloy or high-strength alloy steel to ensure that it can withstand a large workload. Its lubrication system is a self-lubricating design using self-lubricating materials such as graphite, polytetrafluoroethylene (PTFE), etc., and does not require an external lubrication system. Multiple sealing rings or rubber sealing rings are provided at the position connected to the bearing, which can effectively prevent dust, dirt or moisture from entering the bearing seat, thereby keeping the lubricant clean and extending the bearing life. However, since the bearing seat is a split structure, its upper cover and base are fastened with bolts. In a vibrating environment such as coal transportation, the bolts are relatively easy to loosen, resulting in failure of the seal between the upper cover and the base, requiring frequent checks to see if the bolts are loose and whether the seal between the upper cover and the base is effective, which increases the maintenance process.

[0020] Please see attached Figure 1 , Figure 1: is a three-dimensional schematic diagram of the maintenance-free spherical roller bearing seat of the present invention; in order to solve the above problems, the present invention provides a maintenance spherical roller bearing seat, specifically, its structure includes: an upper cover 1, a base 2, and a sealing airbag 3, the upper cover 1 and the base 2 are detachably connected by fastening bolts 4; see the attached Figure 2 , Figure 2 Schematic diagram of the upper cover of the maintenance-free spherical roller bearing seat of the present invention; the upper cover 1 includes an upper bearing cavity 11, upper closing cover plates 12 are provided on both sides of the upper bearing cavity 11, bolt holes 5 adapted to the fastening bolts 4 are provided on the upper closing cover plates 12, an upper half bearing mounting groove 111 and an upper half sealing member mounting groove 112 are provided in the upper bearing cavity 11, two lower closing cover seats 21 are provided on the base 2, bolt holes 5 adapted to the fastening bolts 4 are also provided on the lower closing cover seats 21, a lower bearing cavity 22 is provided between the two lower closing cover seats 21, and the lower bearing cavity 22 is provided with a lower bearing mounting groove 221 and a lower sealing member mounting groove 222, wherein the upper bearing mounting groove 111 and the lower bearing mounting groove 221 form a complete bearing mounting groove for installing a spherical roller bearing, etc., the upper sealing member mounting groove 112 and the lower sealing member mounting groove 222 form a sealing member mounting groove for installing a seal, and the seal is used to seal the connection position between the shaft and the bearing seat. An installation fixing position 23 for fixing to the outside is also provided on the base 2, and the installation fixing position 23 can be a screw hole fixed to the outside by bolts, etc.

[0021] In order to solve the problem of joint sealing between the upper closing cover plate 12 and the lower closing cover seat 21, an upper closed groove 121 is provided on the upper closing cover plate 12, and the upper closed groove 121 is along the edge of the upper closing cover plate 12, and its notch faces the direction of the splitting surface, wherein the splitting surface refers to the overlapping surface when the upper closing cover plate 12 and the lower closing cover seat 21 are combined; a lower closed groove 211 is provided on the lower closing cover seat 21, and the lower closed groove 211 is along the edge of the lower closing cover plate, and its notch also faces the direction of the splitting surface, and the notches of the upper closed groove 121 and the lower closed groove 211 can be directly matched. Specifically, in this embodiment Taking the lower closing cover seat 21 as an example, the lower closing cover seat 21 is a rectangular structure with inverted corners, and the lower closed groove 211 thereon is also a U-shaped groove with a smooth transition at the corner, and the end area of ​​the lower closed groove 211 overlaps with the groove of the lower half sealing groove in the axial direction, that is, the end of the lower closed groove 211 is on the outside of the lower half sealing groove, and the outside refers to the area outside the center of the base 2. Similarly, the end of the upper closed groove 121 is on the outside of the upper half sealing groove, and the upper closed groove 121 overlaps with the lower closed groove 211 to form a sealed cavity located on the upper cover 1 and the base 2, and the sealing airbag 3 can be adapted to be installed in the sealed cavity.

[0022] Figure 4 for Figure 3Schematic diagram of the enlarged section A in the middle; in order to enable the sealing airbag 3 to fill the corresponding gap, an elastic extrusion member 6 is provided in the lower closed groove 211, and the elastic extrusion member 6 includes a spring block 61 and a locking plate 62. The spring block 61 is adapted to the lower closed groove 211 and can move up and down along the groove wall of the lower closed groove 211. The spring block 61 is connected to the bottom of the lower closed groove 211 by a spring, and a locking plate 62 is provided in the base 2 around the bolt hole 5 on the base 2; please refer to the attached Figure 5 , Attachment Figure 6 , Figure 5 This is a schematic diagram of the elastic extrusion component of the maintenance-free spherical roller bearing seat of the present invention. Figure 6 for Figure 5 The enlarged schematic diagram of the area B in the middle; the locking piece 62 includes a locking end 621 and a trigger end 622, the end of the trigger end 622 is located in the bolt hole 5, that is, the trigger end 622 is located on the entry route of the fastening bolt 4, and the cross-section of the locking end 621 is a triangular structure, and its lower plane can press the upper end plane of the spring block 61 to limit the spring block 61 from bouncing upward. In some preferred embodiments, the spring block 61 has a certain height, so that when the spring block 61 moves up and down, the tip of the triangle of the locking end 621 is always located on the side of the spring block 61. Wall, a roller structure 623 is provided on the triangular tip of the locking end 621. In the present embodiment, the locking piece 62 is an L-shaped structure, and a rotating shaft movably connected to the base 2 is provided at its L-shaped inflection point, and a torsion spring is provided on the rotating shaft to keep the locking end 621 in a limited state on the spring block 61. The length of the trigger end 622 extending into the bolt hole 5 depends on the width of the contact surface of the locking end 621 for locking. When the locking piece 62 is rotated around its rotating shaft by tightening the bolt 4, the locking end 621 is separated from the upper surface of the spring block 61.

[0023] Usage of the present invention: When using the maintenance-free spherical roller bearing of the present invention, place the bearing and the seal on the shaft in the lower bearing cavity 22 and the lower half seal installation groove 222 respectively, and then place the sealing airbag 3 in the lower closed groove 211. At this time, in the initial state, the spring block 61 in the lower closed groove 211 is in the initial state of being compressed and limited by the locking plate 62. See the attached Figure 7 , Figure 7This is a cross-sectional view of the sealing airbag and base of the maintenance-free spherical roller bearing seat of the present invention. A part of the sealing airbag 3 protrudes from the split surface of the lower base 2, and the upper cover 1 is combined with the base 2, wherein the notches of the upper closed groove 121 and the lower closed groove 211 are opposite to each other to form a complete sealing cavity, and the upper half of the sealing airbag 3 is embedded in the upper closed groove 121, and in the initial state, the height of the sealing airbag 3 is not greater than the height of the sealing cavity, and the height of the sealing cavity refers to the distance between the upper surface of the spring block 61 in the initial state and the upper top surface of the upper closed groove 121. Press the upper cover 1 and the base 2, screw the locking bolt into the bolt hole 5, and tighten the upper cover 1 and the base 2. When the lower end of the locking bolt contacts the trigger end 622 of the locking plate 62 and continues to move forward, it drives the locking plate 62 to rotate around the axis, see the attached figure. Figure 8 , Figure 8 The schematic diagram of the locking end disengaged state of the maintenance-free spherical roller bearing seat of the present invention is shown in FIG. 6 . The locking end 621 is disengaged from the upper surface of the spring block 61, so that the spring block 61 bounces upward and compresses the sealing airbag 3 in the sealing cavity. The sealing airbag 3 is deformed under pressure and fills the entire compressed sealing cavity. When there is a gap between the upper cover plate 12 and the lower cover seat 21, see the attached Fig. 9 , Fig. 9 The diagram is a schematic diagram of the sealing airbag blocking the gap of the maintenance-free spherical roller bearing seat of the present invention. The deformation zone generated by the pressure of the sealing airbag 3 will fill the gap, forming an adaptive seal, effectively preventing pollutants from entering the bearing cavity from the gap between the upper cover 1 and the base 2. Similarly, even if the fastening bolts 4 are loose, the pollutants cannot enter the bearing cavity from the gap between the upper cover 1 and the base 2 due to the blocking of the sealing airbag 3.

[0024] It should be noted that the upper closed groove 121 and the lower closed groove 211 of the maintenance-free spherical roller bearing seat of the present invention are arranged along the edges of the upper cover 1 and the base 2, effectively covering the channel for pollutants to enter from the split surface, and the end of the lower closed groove 211 is on the outside of the lower half sealing groove, and the end of the upper closed groove 121 is on the outside of the upper half sealing groove, and the seal is used to block pollutants in the edge area not covered by the end, thereby achieving complete coverage of the split surface, and the sealed cabin formed by the upper closed groove 121 and the lower closed groove 211 is filled with a sealing airbag 3, the airbag can be made of rubber material, the sealing airbag 3 spans the split between the upper cover 1 and the base 2, and can prevent pollutants from entering the bearing cavity from the split; in the present embodiment, the sealing airbag 3 is a component independent of the upper cover 1 and the base 2, and in other preferred embodiments, one end of the sealing airbag 3 can be fixedly connected to the upper top surface of the upper closed groove 121 at its upper end.

[0025] It should also be noted that, in order to ensure that the upper cover plate 12 and the lower cover seat 21 are in direct contact and connected during installation, the volume of the sealing airbag 3 does not exceed the volume of the sealing cavity, that is, preferably, the length, width and height of the sealing airbag 3 are slightly smaller than the length, width and height of the sealing cavity, so that when the sealing airbag 3 is placed, the sealing airbag 3 will not interfere with the sealing cavity, avoiding the problem of interference and extrusion during installation, resulting in the sealing material being squeezed into the gap between the upper cover plate 12 and the lower cover seat 21, affecting the joining accuracy between the upper cover 1 and the base 2, but when the size of the sealing material is smaller than the closed cavity At the same time, gaps will be created for contaminants to enter, and effective sealing will not be achieved. Therefore, in the present application, a spring block 61 is provided in the closed groove 211 that can squeeze the sealing airbag 3, change the shape of the sealing airbag 3, and correct the sealing of the split surface. On the basis of tightening the upper cover 1 and the base 2, when the fastening bolt 4 is about to be tightened, the end of the fastening bolt 4 triggers the locking plate 62, which releases the limit on the spring block 61 and releases the elastic force of the spring block 61, thereby achieving a tight closure of the gap and avoiding obstruction to the combination of the upper cover 1 and the base 2 during the installation stage.

[0026] The locking piece 62 of the present invention has a torsion spring on its rotating shaft. After the locking piece 62 is rotated to a certain angle by the tightening bolt 4, preferably, in this example, three locking pieces 62 are arranged around the bolt hole 5, wherein two locking pieces 62 are arranged opposite to each other. Under the rebound tendency of the torsion spring on the rotating shaft, the locking end 621 of the locking piece 62 tends to move upward, which will squeeze the bolt and produce a locking effect. Since the loosening of the bolt is caused by the gap between the threads, it will cause shaking and loosening in a vibration environment. Therefore, the locking piece 62 around the tightening bolt 4 of the present invention can further prevent the bolt from loosening; wherein in the preferred embodiment In the embodiment, the spring block 61 has a certain height, so that when the spring block 61 moves, the trigger end 622 of the locking plate 62 is always facing the side wall of the spring block 61, and a roller structure 623 is provided on the tip of the locking end 621 with a triangular cross-section on the spring block 61, so that when the tip of the locking end 621 contacts the outer wall of the spring block 61, it is in a rolling and sliding state to avoid affecting the up and down movement of the spring block 61. When the fastening bolt 4 loosens and moves upward, it drives the locking plate 62 to rotate upward, and when the locking end 621 contacts the spring block 61, the locking plate 62 cannot continue to rotate, thereby in turn providing further locking force to the fastening bolt 4 to prevent it from loosening.

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A maintenance-free spherical roller bearing seat, characterized in that: It includes an upper cover, a base, and a sealing airbag, wherein the upper cover includes an upper closing cover plate and an upper bearing cavity, the upper closing cover plates are provided on both sides of the upper bearing cavity, the base includes a lower closing cover seat and a lower bearing cavity, the lower closing cover seat is provided on both sides of the lower bearing cavity, the upper closing cover plate and the lower closing cover seat are detachably matched; the upper closing cover plate is provided with an upper closed groove arranged along the edge of the upper closing cover plate, the lower closing cover seat is provided with a lower closed groove arranged along the edge of the lower closing cover seat, the upper closed groove and the lower closed groove are relatively matched to form a closed cavity, the sealing airbag is arranged in the closed cavity, and the sealing airbag spans the joint surface of the upper closed groove and the lower closed groove; an elastic extrusion piece is provided in the lower closed groove, wherein the elastic extrusion piece is elastically connected to the bottom of the lower closed groove for extruding the sealing airbag.

2. The maintenance-free spherical roller bearing seat according to claim 1, characterized in that: An upper half seal installation groove is arranged in the upper bearing cavity, and an end of the upper closed groove is located outside the upper half seal installation groove.

3. The maintenance-free spherical roller bearing seat according to claim 1, characterized in that: A lower half seal installation groove is provided in the lower bearing cavity, and the end of the lower closed groove is located outside the lower half seal installation groove.

4. The maintenance-free spherical roller bearing seat according to claim 1, characterized in that: The elastic extrusion member comprises an elastic block and a locking plate. The elastic block is elastically connected to the bottom of the lower closed groove, and the locking plate is used to control the initial position of the elastic block.

5. The maintenance-free spherical roller bearing seat according to claim 4, characterized in that: The locking plate comprises a locking end and a triggering end, wherein the locking end is detachably connected to the upper surface of the spring block, and the triggering end is located in the bolt hole.

6. The maintenance-free spherical roller bearing seat according to claim 5, characterized in that: It also includes a fastening bolt for fixing the upper cover and the base, wherein the fastening bolt is adaptively connected to the bolt hole, wherein the fastening bolt changes the position of the locking end by changing the position of the trigger end.

7. The maintenance-free spherical roller bearing seat according to claim 5, characterized in that: The locking end is provided with a roller structure, and the elastic block has a side wall surface which can contact and move relatively with the roller structure.

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