阅读说明：本技术 一种带粉末润滑剂的金属板带摩擦复合装置 (Metal plate belt friction composite device with powder lubricant ) 是由 包仲南 黄伟 徐泷 马德高 陈昊 玉晓波 李代明 李卫东 安俊博 于 2020-06-24 设计创作，主要内容包括：本发明涉及一种带粉末润滑剂的金属板带摩擦复合装置,包括两个挤压辊、第一凹槽、第一流通槽、稳定槽,所述挤压辊内设置有同时处于稳定槽和第一流通槽内的弧状板,所述弧状板用于封闭第一流通槽的开口,所述弧状板朝向稳定槽内的一侧设置有第一斜面,所述挤压辊内设置有微型气缸,所述微型气缸连接有与第一斜面贴合的斜块,所述斜块的斜面与第一斜面贴合,所述第一凹槽内设置有输油管,所述输油管的外侧设置有限制输油管的流量的限制装置,两个所述挤压辊的上方设置有用于向两个挤压辊之间投料的填料装置。本发明具有对轧辊之间进行润滑的优点。(The invention relates to a metal plate friction compounding device with a powder lubricant, which comprises two extrusion rollers, a first groove, a first flow through groove and a stabilizing groove, wherein an arc-shaped plate which is positioned in the stabilizing groove and the first flow through groove at the same time is arranged in the extrusion rollers, the arc-shaped plate is used for sealing an opening of the first flow through groove, one side of the arc-shaped plate, which faces the stabilizing groove, is provided with a first inclined surface, the extrusion rollers are internally provided with micro cylinders, the micro cylinders are connected with inclined blocks which are attached to the first inclined surfaces, the inclined surfaces of the inclined blocks are attached to the first inclined surfaces, an oil conveying pipe is arranged in the first groove, the outer side of the oil conveying pipe is provided with a limiting device for limiting the flow of the oil conveying pipe, and a filling device for feeding materials between the two extrusion rollers is arranged. The invention has the advantage of lubricating the rollers.)

1. The utility model provides a take powder lubricant's metal plate strip friction set composite, includes two squeeze rolls (1), its characterized in that: the two extrusion rollers (1) are horizontally arranged, a first groove (2) is arranged in the middle of the side face of each extrusion roller (1), a plurality of first flow through grooves (3) communicated with the bottoms of the first grooves (2) are arranged in each extrusion roller (1), one end, far away from the first grooves (2), of each first flow through groove (3) is communicated with the outside, a stabilizing groove (4) is arranged at one end, far away from the first grooves (2), of each first flow through groove (3), an arc-shaped plate (5) which is simultaneously positioned in the stabilizing groove (4) and the first flow through grooves (3) is arranged in each extrusion roller (1), the arc-shaped plate (5) is used for sealing the opening of the first flow through groove (3), a first inclined face (6) is arranged on one side, facing the stabilizing groove (4), of each arc-shaped plate (5), and a micro air cylinder (7) is arranged in each extrusion roller (1), the utility model discloses a material feeding device, including miniature cylinder (7), sloping block (8) with first inclined plane (6) laminating are connected with in miniature cylinder (7), the inclined plane and the laminating of first inclined plane (6) of sloping block (8), be provided with defeated oil pipe (9) in first recess (2), the outside of defeated oil pipe (9) is provided with the limiting device of the flow of restriction defeated oil pipe (9), two the top of squeeze roll (1) is provided with and is used for throwing the packing device of material between two squeeze rolls (1).

2. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 1, wherein: limiting device includes first fixed block (10), be provided with first chute (41) that run through first fixed block (10) in first fixed block (10), defeated oil pipe (9) run through first fixed block (10) and are in one side in first chute (41), be provided with first disc (11) in first fixed block (10), the side of first disc (11) is provided with friction line, the equal body coupling in both sides of first disc (11) has head rod (12), the lateral wall of first fixed block (10) is provided with first connecting groove (13) that are used for holding head rod (12).

3. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 1, wherein: defeated oil pipe (9) are connected with raceway (14) with defeated oil pipe (9) intercommunication, second fixed block (15) have been cup jointed in the outside of raceway (14), the inside of second fixed block (15) is provided with second chute (16), raceway (14) run through second fixed block (15) and are in one side in second chute (16), be provided with second disc (17) in second fixed block (15), the side of second disc (17) is provided with friction line, the equal body coupling in both sides of second disc (17) has second connecting rod (18), the lateral wall of second fixed block (15) is provided with second spread groove (19) that are used for holding second connecting rod (18).

4. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 1, wherein: the packing device is including placing piece (20), the bottom of placing piece (20) is provided with and runs through spray opening (21) of placing piece (20), the top of spray opening (21) is provided with rotary device, the last a plurality of pieces of discharging (22) that are provided with of rotary device, piece of discharging (22) are provided with breach (23), and when piece of discharging (22) rotated the top to spray opening (21), breach (23) and spray opening (21) align.

5. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 4, wherein: the rotating device comprises a rotating motor (24) arranged on the inner side wall of the placing block (20), the rotating motor (24) is connected with a rotating disk (25), a limiting plate (26) located in the circumferential direction of the placing block (22) is arranged above the rotating disk (25), and an oscillating device is arranged above the placing block (20).

6. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 5, wherein: the oscillating device comprises a first gear (27) sleeved outside a rotating disc (25), the first gear (27) is meshed with a second gear (28), a third connecting rod (29) is fixedly connected to the middle of the second gear (28), a cross rod (30) is integrally connected to one end, away from the second gear (28), of the third connecting rod (29), a limiting plate (26) is arranged to be oval, and one end of the limiting plate (26) is connected with a spring (31) fixedly connected with a discharging block (22).

7. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 5, wherein: the one end that third connecting rod (29) was kept away from in horizontal pole (30) is provided with second recess (32), second recess (32) are connected with fixed axle (33), dwang (34) have been cup jointed in fixed axle (33), the length direction of dwang (34) is unanimous with the length direction of horizontal pole (30), torsional spring (35) that one end and fixed axle (33) are connected the other end and are connected with dwang (34) have been cup jointed in fixed axle (33).

8. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 4, wherein: one side of placing piece (20) is provided with fixed column (36), the terminal surface an organic whole of fixed column (36) is connected with connecting pipe (37), the middle part of fixed column (36) is provided with conveyer trough (38) of running through fixed column (36) and connecting pipe (37), graphite alkene powder has been placed in conveyer trough (38), the side and the external world intercommunication that squeeze roll (1) was run through in conveyer trough (38), the opening area of conveyer trough (38) in connecting pipe (37) is less than the opening of conveyer trough (38) in fixed column (36).

9. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 8, wherein: one end of the conveying groove (38) is provided with a micro fan (39).

10. The metal plate strip friction compounding device with the powder lubricant as claimed in claim 1, wherein: the extrusion roller (1) is integrally connected with a supporting block (40) positioned at an opening of the first flow through groove (3), and the supporting block (40) is positioned on one side of the arc-shaped block, which faces the first groove (2).

Technical Field

The invention relates to the technical field of metal plate strip friction compounding, in particular to a metal plate strip friction compounding device with a powder lubricant.

Background

Rolling is a plastic working method of metal in which the shape and size of a cross section of the metal are changed between rolls rotating in a rolling mill while controlling the structural state and properties thereof. Rolling is the process by which continuous plastic deformation of the metal occurs.

Because the friction between the rollers is dragged into the roller gap in the rolling process, the friction is a condition for ensuring the rolling process to be smoothly carried out, and meanwhile, the friction also causes the rolling pressure to be increased, the roller abrasion is aggravated, and the surface quality of a rolled product is deteriorated, so that process lubrication is required to be adopted and needs to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a metal plate and strip friction composite device with a powder lubricant, which has the advantage of lubricating between rollers.

In order to achieve the purpose, the invention provides the following technical scheme: a metal plate friction composite device with a powder lubricant comprises two extrusion rollers, wherein the two extrusion rollers are horizontally arranged, a first groove is formed in the middle of the side face of each extrusion roller, a plurality of first flow through grooves communicated with the bottom of the first groove are formed in each extrusion roller, one end, away from the first groove, of each first flow through groove is communicated with the outside, a stabilizing groove is formed in one end, away from the first groove, of each extrusion roller, arc-shaped plates are arranged in the stabilizing grooves and the first flow through grooves simultaneously and used for sealing openings of the first flow through grooves, a first inclined face is arranged on one side, facing the stabilizing groove, of each arc-shaped plate, a micro cylinder is arranged in each extrusion roller and connected with an inclined block attached to the first inclined face, and the inclined face of each inclined block is attached to the first inclined face, an oil delivery pipe is arranged in the first groove, a limiting device for limiting the flow of the oil delivery pipe is arranged on the outer side of the oil delivery pipe, and a filling device for feeding materials between the two extrusion rollers is arranged above the extrusion rollers.

By adopting the technical scheme, oil is conveyed into the oil conveying pipe, the oil flows into the first flow through groove from the first groove, flows out of the first flow through groove and enters between the two extrusion rollers to achieve the purpose of lubrication and can also achieve the purpose of cooling, the arrangement of the first flow through grooves enables the oil in the oil conveying pipe to flow to multiple directions of the extrusion rollers, the oil can conveniently reach the circumferential direction of the extrusion rollers under the action of centrifugal force, in addition, when the lubrication is not needed to be carried out on the side surfaces of the two extrusion rollers, the miniature air cylinder is started to drive the inclined block to move towards the direction of the arc-shaped block until the inclined block extrudes the arc-shaped block so as to enable the arc-shaped block to flow towards the opening of the first flow through groove, after the arc-shaped block moves to the opening of the first flow through groove, the arc-shaped block can seal the first flow through groove, in addition, because the two extrusion rollers are horizontally arranged, a filling device, the lubricating property between the two extrusion rollers is enhanced from the outside, the two extrusion rollers cannot be vertically arranged, and when oil transportation is not needed, the lubricating oil transportation into the oil transportation pipe can be stopped by utilizing a limiting device.

The invention is further configured to: the limiting device comprises a first fixing block, a first chute penetrating through the first fixing block is arranged in the first fixing block, one side of the oil conveying pipe penetrating through the first fixing block and located in the first chute is provided with a first disc in the first fixing block, friction grains are arranged on the side face of the first disc, first connecting rods are integrally connected to the two sides of the first disc, and first connecting grooves used for containing the first connecting rods are formed in the side wall of the first fixing block.

Through adopting above-mentioned technical scheme, the disc can only remove along the length direction of first connecting groove under the restriction of head rod, lets first disc rotate until the side of first disc extrusion defeated oil pipe, and defeated oil pipe receives the compression back of first disc, and defeated oil pipe and the space of the extrusion department of first disc will reduce until unable transportation lubricating oil, can restrict defeated oil pipe this moment.

The invention is further configured to: defeated oil pipe is connected with the raceway with defeated oil pipe intercommunication, the second fixed block has been cup jointed in the outside of raceway, the inside of second fixed block is provided with the second chute, the raceway runs through the second fixed block and is in one side in the second chute, be provided with the second disc in the second fixed block, the side of second disc is provided with friction line, the equal body coupling in both sides of second disc has the second connecting rod, the lateral wall of second fixed block is provided with the second spread groove that is used for holding the second connecting rod.

Through adopting above-mentioned technical scheme, the disc can only remove along the length direction of second spread groove under the restriction of second connecting rod, let the second disc rotate the side until the second disc extrusion raceway, who's water pipe receives the compression back of second disc, the raceway will reduce until unable transportation moisture with the space of the extrusion department of second disc, can restrict the raceway this moment, when the second disc no longer restricts the raceway, can close defeated oil pipe, open the outlet pipe alone, rivers not only can wash the lubricating oil in first recess and the first circulation inslot this moment, and can cool down the processing to two squeeze rolls.

The invention is further configured to: the packing device is including placing the piece, the bottom of placing the piece is provided with the nozzle that runs through and place the piece, the top of nozzle is provided with rotary device, the last a plurality of blowing pieces that are provided with of rotary device, the blowing piece is provided with the breach, and when the blowing piece rotated to the top of nozzle, breach and nozzle align.

Through adopting above-mentioned technical scheme, start rotary device and drive the blowing piece and rotate, when the blowing piece rotated the top to the sprinkler orifice, breach and sprinkler orifice align, and the solid-state powder in the blowing piece can be followed and spilled between two squeeze rolls in the sprinkler orifice this moment.

The invention is further configured to: the rotating device comprises a rotating motor arranged on the inner side wall of the placing block, the rotating motor is connected with a rotating disk, a limiting plate located in the circumferential direction of the placing block is arranged above the rotating disk, and an oscillating device is arranged above the placing block.

By adopting the technical scheme, the rotary motor is started to drive the rotary disk to rotate, the rotary disk can drive the discharging blocks above the rotary disk to rotate after rotating, so that the powder in one of the discharging blocks can be switched to the other discharging block in a full state after being poured, in addition, the solid powder is not easy to separate from the discharging blocks after being placed in the discharging blocks for a long time, and the discharging blocks can be oscillated by utilizing the oscillating device at the moment.

The invention is further configured to: the oscillating device comprises a first gear sleeved outside the rotating disc, the first gear is meshed with a second gear, a third connecting rod is fixedly connected to the middle of the second gear, one end, far away from the second gear, of the third connecting rod is integrally connected with a cross rod, the limiting plate is arranged to be oval, and one end of the limiting plate is connected with a spring fixedly connected with the discharging block.

Through adopting above-mentioned technical scheme, the rotary disk drives first gear rotation and then drives the second gear and rotates round the axial lead of self after rotating, the rotation of second gear can drive the rotation of third connecting rod and then drive the horizontal pole and rotate, after the horizontal pole rotates to collide with the blowing piece, can vibrate the blowing piece, the second gear can continue to rotate this moment, thereby extrude the blowing piece, let the blowing piece remove and then extrude the spring along the length direction of limiting plate, consequently, the blowing piece can not restrict the horizontal pole and continue to rotate round the axial lead of third connecting rod, and after the horizontal pole no longer extrudees the blowing piece, the blowing piece will reply to the normal position under the effect of spring.

The invention is further configured to: the one end that the third connecting rod was kept away from to the horizontal pole is provided with the second recess, second groove connection has the fixed axle, the dwang has been cup jointed to the fixed axle, the length direction of rotating rod is unanimous with the length direction of horizontal pole, the torsional spring that one end and fixed axle connection other end and dwang are connected has been cup jointed to the fixed axle.

Through adopting above-mentioned technical scheme, the removal of horizontal pole will drive the dwang and remove, and after the horizontal pole striking bleeder block, the dwang also can strike the bleeder block, and the dwang can rotate round the axial lead of fixed axle in addition, therefore the horizontal pole continues the pivoted in-process, and the dwang will not receive the restriction of bleeder block and the dead phenomenon of card appears, and the setting up of torsional spring lets the dwang reply to be in same straight line state with the dwang.

The invention is further configured to: one side of placing the piece is provided with the fixed column, the terminal surface an organic whole of fixed column is connected with the connecting pipe, the middle part of fixed column is provided with the conveyer trough that runs through fixed column and connecting pipe, graphite alkene powder has been placed in the conveyer trough, the side and the external intercommunication that the conveyer trough runs through the squeeze roll, the open area of the conveyer trough in the connecting pipe is less than the opening of the conveyer trough in the fixed column.

Through adopting above-mentioned technical scheme, in the course of work of squeeze roll, the junction of two squeeze rolls generates heat easily, causes the inhomogeneous phenomenon of heat distribution, consequently can place the stronger graphite alkene powder of heat conductivility in the conveyer trough, lets graphite alkene powder distribution between two squeeze rolls, lets the heat that produces in the squeeze roll course of work can comparatively even distribution.

The invention is further configured to: and a micro fan is arranged at one end of the conveying groove.

Through adopting above-mentioned technical scheme, the volume that graphite alkene powder was carried to between two squeeze rolls can be controlled in setting up of miniature fan.

The invention is further configured to: the extrusion roller is integrally connected with a supporting block positioned at the opening of the first flow through groove, and the supporting block is positioned on one side of the arc-shaped block facing the first groove.

By adopting the technical scheme, when the arc-shaped block is positioned at the opening of the first flow through groove, the arc-shaped block bears larger pressure, and the supporting block can bear part of the pressure.

In conclusion, the invention has the following beneficial effects:

the oil is transported in the oil transportation pipe, the oil flows into the first flow through groove from the first groove, and then flows out of the first flow through groove to enter between the two extrusion rollers, so as to achieve the purpose of lubrication and cooling, the oil in the oil transportation pipe can flow to multiple directions of the extrusion rollers through the arrangement of the first flow through grooves, the oil can conveniently reach the circumferential direction of the extrusion rollers under the action of centrifugal force, in addition, when the side surfaces of the two extrusion rollers are not required to be lubricated, the micro cylinder is started to drive the inclined block to move towards the direction of the arc-shaped block until the inclined block extrudes the arc-shaped block, so as to enable the arc-shaped block to flow towards the opening of the first flow through groove, after the arc-shaped block moves to the opening of the first flow through groove, the first flow through groove can be sealed by the arc-shaped block, in addition, because the two extrusion rollers are horizontally arranged, a filling device positioned above, the lubricating property between the two extrusion rollers is enhanced from the outside, the two extrusion rollers cannot be vertically arranged, and when oil transportation is not needed, the lubricating oil transportation into the oil transportation pipe can be stopped by utilizing a limiting device.

Drawings

FIG. 1 is a schematic view of the internal structure of the embodiment;

FIG. 2 is an enlarged view of a portion of area A of FIG. 1;

FIG. 3 is a schematic structural diagram of a connection relationship among an oil pipe, a first fixing block, a first disc, a first connecting rod, a first connecting groove and a first inclined groove in the embodiment;

FIG. 4 is a schematic structural diagram illustrating a connection relationship between the water pipe, the second fixing block, the second chute, the second disc, the second connecting rod and the second connecting groove in the embodiment;

FIG. 5 is a schematic structural diagram of the connection relationship among the rotating disc, the limiting plate, the discharging block and the spring in the embodiment;

FIG. 6 is a schematic structural diagram of the connection relationship among the cross bar, the second groove, the fixing shaft, the rotating rod and the torsion spring in the embodiment;

FIG. 7 is a transverse perspective view of the squeeze roll of the embodiment;

fig. 8 is a schematic structural view of an arc plate in the embodiment.

Reference numerals: 1. a squeeze roll; 2. a first groove; 3. a first circulation slot; 4. a stabilizing slot; 5. an arc-shaped plate; 6. a first inclined plane; 7. a micro cylinder; 8. a sloping block; 9. an oil delivery pipe; 10. a first fixed block; 11. a first disc; 12. a first connecting rod; 13. a first connecting groove; 14. a water delivery pipe; 15. a second fixed block; 16. a second chute; 17. a second disc; 18. a second connecting rod; 19. a second connecting groove; 20. placing the blocks; 21. a spray opening; 22. a material placing block; 23. a notch; 24. a rotating electric machine; 25. rotating the disc; 26. a limiting plate; 27. a first gear; 28. a second gear; 29. a third connecting rod; 30. a cross bar; 31. a spring; 32. a second groove; 33. a fixed shaft; 34. rotating the rod; 35. a torsion spring; 36. fixing a column; 37. a connecting pipe; 38. a conveying trough; 39. a micro fan; 40. a support block; 41. a first chute.

Detailed Description

The invention is further described with reference to the accompanying drawings.

A metal plate friction composite device with a powder lubricant is shown in figures 1-8 and comprises two extrusion rollers 1, wherein the two extrusion rollers 1 are horizontally arranged, a first groove 2 is arranged in the middle of the side surface of each extrusion roller 1, a plurality of first flow through grooves 3 communicated with the bottom of the first groove 2 are arranged in each extrusion roller 1, one end, far away from the first groove 2, of each first flow through groove 3 is communicated with the outside, a stabilizing groove 4 is arranged at one end, far away from the first groove 2, of each extrusion roller 1, an arc-shaped plate 5 is arranged in each first flow through groove 3, the arc-shaped plate 5 is used for sealing the opening of the corresponding first flow through groove 3, a first inclined surface 6 is arranged on one side, facing the stabilizing groove 4, of each arc-shaped plate 5, a micro air cylinder 7 is arranged in each extrusion roller 1, the micro cylinder 7 is connected with an oblique block 8 attached to the first inclined plane 6, the inclined plane of the oblique block 8 is attached to the first inclined plane 6, an oil conveying pipe 9 is arranged in the first groove 2, a limiting device for limiting the flow of the oil conveying pipe 9 is arranged on the outer side of the oil conveying pipe 9, and a filling device used for feeding materials between the two extrusion rollers 1 is arranged above the extrusion rollers 1. The oil delivery pipe 9 is inserted into the squeeze roller 1 from the middle of the squeeze roller 1, so that the rotation of the squeeze roller does not drive the rotation of the oil delivery pipe 9. The internal structure of both squeeze rolls 1 is identical.

Limiting device includes first fixed block 10, be provided with the first chute 41 that runs through first fixed block 10 in the first fixed block 10, defeated oil pipe 9 runs through first fixed block 10 and is in one side in first chute 41, be provided with first disc 11 in the first fixed block 10, the side of first disc 11 is provided with the friction line, the homogeneous body coupling in both sides of first disc 11 has head rod 12, the lateral wall of first fixed block 10 is provided with the first connecting groove 13 that is used for holding head rod 12.

Defeated oil pipe 9 is connected with raceway 14 with defeated oil pipe 9 intercommunication, second fixed block 15 has been cup jointed in the outside of raceway 14, the inside of second fixed block 15 is provided with second chute 16, raceway 14 runs through second fixed block 15 and is in one side in second chute 16, be provided with second disc 17 in the second fixed block 15, the side of second disc 17 is provided with friction line, the equal body coupling in both sides of second disc 17 has second connecting rod 18, the lateral wall of second fixed block 15 is provided with second spread groove 19 that is used for holding second connecting rod 18.

The packing device is including placing piece 20, the bottom of placing piece 20 is provided with the nozzle 21 that runs through placing piece 20, the top of nozzle 21 is provided with rotary device, the last a plurality of pieces of discharging 22 that are provided with of rotary device, the piece of discharging 22 is provided with breach 23, and when the piece of discharging 22 rotated to the top of nozzle 21, breach 23 and nozzle 21 align.

The rotating device comprises a rotating motor 24 arranged on the inner side wall of the placing block 20, the rotating motor 24 is connected with a rotating disk 25, a limiting plate 26 located on the circumferential direction of the placing block 22 is arranged above the rotating disk 25, and an oscillating device is arranged above the placing block 20. The rotating disc 25 is provided with through holes to allow the material in the emptying block 22 to pass through the rotating disc and through the spraying opening 21.

The oscillating device comprises a first gear 27 sleeved outside the rotating disc 25, the first gear 27 is meshed with a second gear 28, a third connecting rod 29 is fixedly connected to the middle of the second gear 28, one end, away from the second gear 28, of the third connecting rod 29 is integrally connected with a cross rod 30, the limiting plate 26 is arranged to be oval, and one end of the limiting plate 26 is connected with a spring 31 fixedly connected with the discharging block 22.

One end that third connecting rod 29 was kept away from to horizontal pole 30 is provided with second recess 32, second recess 32 is connected with fixed axle 33, fixed axle 33 has cup jointed dwang 34, and the length direction that the dwang 34 was searched to the Su is unanimous with the length direction of horizontal pole 30, fixed axle 33 has cup jointed the torsional spring 35 that one end and fixed axle 33 are connected the other end and are connected with dwang 34.

The graphene powder packaging device is characterized in that a fixing column 36 is arranged on one side of the placing block 20, a connecting pipe 37 is integrally connected to the end face of the fixing column 36, a conveying groove 38 penetrating through the fixing column 36 and the connecting pipe 37 is formed in the middle of the fixing column 36, graphene powder is placed in the conveying groove 38, the conveying groove 38 penetrates through the side face of the extrusion roller 1 and is communicated with the outside, and the opening area of the conveying groove 38 in the connecting pipe 37 is smaller than that of the conveying groove 38 in the fixing column 36.

One end of the conveying groove 38 is provided with a micro fan 39.

The squeeze roll 1 is integrally connected with a supporting block 40 at the opening of the first circulation groove 3, and the supporting block 40 is positioned at one side of the arc-shaped block facing the first groove 2.

The powder lubricant may be selected from glass lubricant or graphite or wax.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.