Pipe fitting lubricating method

Abstract

The invention provides a pipe fitting lubricating method which comprises the steps of a machine table, a cushion pipe, selection and placement of a block-up pipe, placement of a pipe fitting, lubrication and the like. According to the method, the block-up pipe with the pipe diameter parameter and the section shape matched with those of the pipe fitting is placed between the pipe fitting and a table top, and an oil coating part is surrounded inside; according to the oiling device, the oiling part is arranged in the heightening pipe, so that redundant grease is scraped into the heightening pipe while the oiling part downwards retracts into the heightening pipe to lubricate the pipe, the phenomenon of oil accumulation at an opening in the bottom end of the pipe is avoided, the process of manually cleaning the pipe is omitted, and the lubricating effect and the use performance of the pipe are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of furniture lifting sleeve lubrication, and in particular to a pipe lubrication method for preventing grease from accumulating at a pipe opening. Background Art

[0002] For lubrication needs, many pipe fittings need to be lubricated on their inner surfaces to meet the use requirements of the pipe fittings; for example, the telescopic structure formed by two mutually connected sleeves on the legs of a lifting table; Fig.11 As shown, on the legs of the lifting table, the outer wall of the retractable inner sleeve B is provided with a slide C which separates the inner sleeve and the outer sleeve A; since the slide C will contact the inner wall of the outer sleeve A, in order to reduce wear, it is necessary to apply oil to the inner wall of the outer sleeve A, and in order to make the oiling uniform, a pipe inner wall lubrication device came into being, which can spray oil on the inner wall of the pipe and apply it quickly and evenly on the inner wall of the pipe.

[0003] like Fig.12 As shown, an existing lubrication device includes a machine and an oiling portion 11 on the machine. The oiling portion 11 is located inside the pipe 2 to be lubricated in the initial position, and the bottom end of the pipe 2 to be lubricated is in contact with the table 1 of the machine. An oil outlet is provided on the oiling portion 11, and an oil pipeline is connected to the bottom end of the oiling portion. An oiling piece is provided on the oiling portion 11. When the pipe 2 is lubricated, the oiling portion 11 rises to the top of the pipe 2, and then the oil outlet starts to discharge oil. At this time, grease forms an adherent oil layer on the inner wall of the pipe 2, and at the same time, the oiling portion 11 starts to descend toward the bottom end of the pipe 2, and the oiling piece will smear the adherent oil layer into a lubricating oil layer 2a. However, there are problems with this lubrication method.

[0004] After the bottom end of the pipe fitting 2 contacts the table top 1, the opening at the bottom end of the pipe fitting 2 is closed. When the oiling portion 11 returns to the initial position, accumulated grease 2b will be formed near the bottom end of the pipe fitting 2, which is the so-called oil accumulation phenomenon. In order to ensure the lubrication effect of the pipe fitting 2, the accumulated grease 2b must be manually cleaned.

[0005] When manually cleaning the accumulated grease 2b, a cloth is usually used to wipe off the accumulated grease 2b, but this cleaning method is not effective, it is difficult to maintain the uniformity of the grease on the inner wall of the pipe 2, and it is easy to destroy the lubricating oil layer 2a in the uniform position, thus affecting the performance of the pipe 2. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a pipe lubrication method, by placing a section of a gasket tube whose diameter parameters and cross-sectional shape match the pipe between the pipe and the table, and enclosing the oiling portion therein, so that the oiling portion retracts downward into the gasket tube to lubricate the pipe and at the same time scrapes excess grease into the gasket tube, thereby avoiding oil accumulation at the bottom opening of the pipe, eliminating the manual cleaning process of the pipe, and ensuring the lubrication effect and performance of the pipe.

[0007] The technical solution of the present invention is achieved in this way: A pipe lubrication method comprises the following steps: S1: Select and place a gasket tube; select a section of gasket tube that matches the cross-sectional shape and diameter parameters of the pipe to be lubricated, and then place the gasket tube on the table of the machine, and make the oiling part on the table that can be extended up and down completely in the surrounding space of the gasket tube; S2: Place the pipe fitting; place the bottom end of the pipe fitting to be lubricated against the top of the gasket tube, and align the position of the pipe fitting with the gasket tube; S3: Lubrication; control the oiling part to extend upward from the surrounding space of the gasket tube into the pipe fitting to spray grease, and then retract the oiling part downward and cross the junction between the gasket tube and the pipe fitting and return completely to the surrounding space of the gasket tube, so that the oiling part spreads the grease evenly on the inner wall of the pipe fitting and scrapes excess grease into the gasket tube.

[0008] Preferably, the machine platform is provided with a support frame extending upward, with a pressure plate on the top of the support frame, and a driving cylinder is connected to the pressure plate. In step S2, when the bottom end of the pipe to be lubricated is against the top of the gasket tube, the driving cylinder drives the pressure plate to move downward and press the top of the pipe, so that the gasket tube and the pipe remain relatively fixed on the table; when the driving cylinder drives the pressure plate to press the top of the pipe, the pipe and the gasket tube remain relatively fixed in the vertical direction, and at the same time, the compressed gasket tube is tightly attached to the table to generate static friction, so that the gasket tube and the pipe remain relatively fixed in the horizontal direction, so as to facilitate the lubrication of the pipe.

[0009] Preferably, between steps S1 and S2, there is a step: S1a: Pre-set positioning base; the positioning base has a positioning hole that matches the outer diameter and cross-sectional shape of the gasket tube, and the positioning hole penetrates the positioning base; the top of the positioning base is provided with a plurality of protrusions arranged around the positioning hole, and the inner side of the protrusion matches the outer wall of the gasket tube, S1b: Connect the positioning base to the position on the table corresponding to the gasket tube, so that the top of the gasket tube passes through the positioning hole and is close to the inner side of the protrusion, and ensure that the top of the protrusion exceeds the top of the gasket tube to form an installation guide for the pipe fitting; In step S2, when the bottom end of the pipe to be lubricated is against the top of the gasket tube, the inner side of the protrusion is in close contact with the gasket tube and the pipe to prevent the pipe and the gasket tube from being misaligned during installation; and to keep the installed pipe and the gasket tube relatively fixed.

[0010] Preferably, between steps S1 and S2, there is a step: S1a: Pre-set positioning base; the positioning base is provided with a positioning hole matching the outer diameter and cross-sectional shape of the gasket tube, and the positioning hole penetrates the positioning base; S1b: Connect the positioning base to the position on the table corresponding to the pad tube, and make sure the top of the pad tube is not higher than the top of the positioning hole; In step S2, when the bottom end of the pipe to be lubricated abuts against the top end of the gasket tube, the pipe and the gasket tube are in the positioning hole and are tightly attached to the inner wall of the positioning hole. The positioning hole forms an embracing effect on the abutting pipe and the gasket tube to prevent the pipe and the gasket tube from being misaligned during installation.

[0011] Preferably, in step S1, at least one oil drain hole is provided at a position of the gasket tube close to the table surface, and in step S1a, a avoidance cavity corresponding to the position of the oil drain hole is provided on the positioning base, and the avoidance cavity is connected to the positioning hole; in step S3, after the excess grease enters the gasket tube, it can be discharged from the oil drain hole and the avoidance cavity. The excess grease scraped into the gasket tube can be discharged through the oil drain hole and the avoidance cavity, so as to avoid excessive accumulation of grease in the gasket tube.

[0012] Preferably, after step S3, there are further steps: S4: Remove the lubricated pipe fittings; S5: repeating steps S2-S4 to lubricate multiple pipes; S6: Remove the positioning base and the high pipe pad from the table top in turn, and clean the grease adhering to the table top centrally; the grease that enters the high pipe pad and adheres to the table top can be centrally cleaned and recycled, without causing material waste.

[0013] Preferably, in step S1, a plurality of screw holes are provided on the table top, in step S1a, a through hole corresponding to the position of the screw hole is provided on the positioning base, in step S2, a screw is screwed into the screw hole through the through hole to fix the positioning base on the table top; in step S6, the screw is removed to separate the positioning base from the table top. The screw connection method has a good connection effect, so that the positioning base can form a stable positioning effect for the pipe fittings and the gasket pipe, and the screw removal is also very convenient, so that the positioning base can be quickly removed from the table top.

[0014] Preferably, the pipe fitting is made of metal, and in step S1a, the positioning base is made of plastic or nylon whose hardness is lower than that of metal; so that in steps S2 and S4, the positioning base protects the pipe fitting when it contacts the pipe fitting, prevents the outer wall of the pipe fitting from being scratched, and improves the yield rate of the pipe fitting.

[0015] Preferably, in step S1, a plurality of threaded holes are provided on the table top, and at least one support plate extending outward and attached to the table top is provided at the edge of the bottom opening of the gasket tube, and the support plate is provided with through holes corresponding to the positions of the threaded holes; in step S2, screws are passed through the through holes and screwed into the threaded holes to connect the support plate to the table top; the gasket tube connected to the table top by screws will not be laterally offset when supporting the bottom end of the pipe fitting, thereby preventing misalignment between the pipe fitting and the gasket tube, thereby ensuring smooth lubrication process.

[0016] The present invention provides a pipe lubrication method, which has the following advantages over the prior art: 1. By installing the gasket tube between the pipe fitting and the table top, the oil-coated part has space to slide down from the bottom of the pipe fitting. While lubricating the pipe fitting, the excess grease can be scraped into the gasket tube, preventing oil accumulation at the opening at the bottom of the pipe fitting, and will not damage the lubricating oil layer formed on the inner wall of the pipe fitting, thus ensuring the lubrication effect and performance of the pipe fitting.

[0017] 2. The oil drain hole on the gasket tube and the avoidance cavity on the positioning base can drain the excess grease scraped into the gasket tube and clean it separately to avoid excessive accumulation of excess grease in the gasket tube; and the excess grease discharged through the oil drain hole and the avoidance cavity will adhere to the table top. Since the positioning base and the table top are connected by screws, the positioning base can be removed from the table top to facilitate manual centralized cleaning of the grease attached to the table top to ensure the cleanliness of the table top. The cleaned grease can also be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an enlarged view of the location of the pipe gasket on the lubrication equipment; Figure 2 It is a cross-sectional view of the gasket tube position when the pipe fitting is a round pipe; Figure 3 When the pipe fitting is a round pipe, it is an exploded view of the components at the position of the gasket pipe; Figure 4 It is a structural schematic diagram of the positioning base when the pipe fitting is a round pipe; Figure 5 When the pipe fitting is a square pipe, it is an exploded view of the components at the position of the gasket pipe; Figure 6 It is a cross-sectional view of the position of the gasket pipe when the pipe fitting is a square pipe; Figure 7 This is a schematic diagram showing that the oil-coated part is completely surrounded by the gasket tube before lubrication begins; Figure 8 Schematic diagram of the pipe fitting and the gasket pipe being simultaneously in the positioning hole in Example 2; Fig. 9 In Example 3, a schematic diagram of the gasket tube and the table top being connected by screws; Fig.10 A flowchart of the method steps of the present invention; Fig.11 It is an enlarged view of the position of the slide on the leg of the lifting table after cutting in the background technology; Fig.12 The schematic diagram of the principle of grease accumulation at the bottom opening of a pipe in the background technology; The figures are marked as follows: 1-table, 2-pipe fitting, 2a-lubricating oil layer, 2b-accumulated grease, 3-positioning base, 4-gasket pipe, 11-oil coating part, 31-protrusion, 32-through hole, 33-avoidance cavity, 34-positioning hole, 41-oil drain hole, 42-support plate, 43-through hole, A-outer casing, B-inner casing, C-sliding sheet. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0021] like Figure 1-10 As shown, the present invention has multiple embodiments, and the specific embodiments are as follows: Example 1: Figure 1-7 As shown, the present invention provides a pipe lubrication method, which can evenly apply grease to the inner wall of the pipe 2 while preventing excess grease from accumulating at the opening of the pipe 2. The pipe 2 is usually a steel pipe, and the cross-sectional shape of the pipe 2 can be circular or square. The method comprises the following steps: S1: Select and place a gasket tube 4; select a section of the gasket tube 4 that matches the cross-sectional shape and diameter parameters of the pipe 2 to be lubricated, and then place the gasket tube 4 on the table 1 of the machine, and make the oiling part 11 on the table that can be extended up and down completely in the enclosed space of the gasket tube 4; specifically, the bottom end of the oiling part 11 is connected to an oil delivery hard pipe, and the oil delivery hard pipe is connected to a power mechanism that drives the oil delivery hard pipe to move up and down, and the oiling part 11 is provided with a corresponding oil outlet and an oiling part. The structure of the oiling part is diverse, and it can be an oiling ring that is sleeved on the oiling part 11 and contacts the inner wall of the pipe 2, or it can be a rotating roller that is rotatably connected to the side wall of the oiling part 11 and contacts the inner wall of the pipe 2; S2: placing the pipe 2; placing the bottom end of the pipe 2 to be lubricated against the top end of the gasket tube 4, and aligning the pipe 2 with the gasket tube 4; S3: Lubrication; control the oiling part 11 to extend upward from the enclosed space of the gasket tube 4 into the pipe fitting 2 to spray grease, and then the oiling part 11 retracts downward and crosses the junction between the gasket tube 4 and the pipe fitting 2 and then completely returns to the enclosed space of the gasket tube 4, so that the oiling part 11 spreads the grease evenly on the inner wall of the pipe fitting 2 and scrapes the excess grease into the gasket tube 4; compared with the background technology in which the accumulated grease 2a accumulates at the bottom opening position of the pipe fitting 2, the present device can form a uniform lubricating oil layer 2b on the inner wall of the pipe fitting 2 while the oiling part 11 completely returns to the gasket tube 4, and scrapes the excess grease into the gasket tube 2, eliminating the process of manually cleaning the accumulated grease 2a.

[0022] Furthermore, in this embodiment, the top end of the pipe fitting 2 is compressed to make the bottom end of the pipe fitting 2 more stable after being abutted against the top end of the gasket tube 4; specifically, a support frame extending upward is provided on the machine platform, and a pressure plate 5 is provided at the top end of the support frame, and a driving cylinder 51 is connected to the pressure plate 5. In step S2, when the bottom end of the pipe fitting 2 to be lubricated abuts against the top end of the gasket tube 4, the driving cylinder 51 drives the pressure plate 5 to move downward and compress the top end of the pipe fitting 2, so that the gasket tube 4 and the pipe fitting 2 remain relatively fixed on the table 1; when the driving cylinder 51 drives the pressure plate 5 to compress the top end of the pipe fitting 2, the pipe fitting 2 and the gasket tube 4 remain relatively fixed in the vertical direction, and at the same time, the compressed gasket tube 4 is in close contact with the table 1 to generate static friction, which also keeps the gasket tube 4 and the pipe fitting 2 relatively fixed in the horizontal direction, so as to facilitate the lubrication of the pipe fitting 2.

[0023] Furthermore, the pipe fitting 2 and the gasket tube 4 are two separate parts. During installation, it is difficult to directly place the bottom end of the pipe fitting 2 against the top end of the gasket tube 4. The pipe fitting 2 and the gasket tube 4 are easily offset when placed. Therefore, there are steps between steps S1 and S2: S1a: Pre-set positioning base 3; the positioning base 3 has a positioning hole 34 that matches the outer diameter and cross-sectional shape of the gasket tube 4, and the positioning hole 34 passes through the positioning base 3; the top of the positioning base 3 is provided with a plurality of protrusions 31 arranged around the positioning hole 34, and the inner side surface of the protrusion 31 matches the outer wall surface of the gasket tube 4; S1b: Connect the positioning base 3 to the position on the table 1 corresponding to the gasket tube 4, so that the top of the gasket tube 4 passes through the positioning hole 34 and is close to the inner side of the protrusion 31, and ensure that the top of the protrusion 31 exceeds the top of the gasket tube 4 to form an installation guide for the pipe 2; when installing the pipe 2, the bottom end can be directly inserted between the protrusions 31; In step S2, when the bottom end of the pipe 2 to be lubricated is against the top of the gasket tube 4, the inner side surface of the protrusion 31 is in close contact with the gasket tube 4 and the pipe 2 at the same time, which can prevent the pipe 2 and the gasket tube 4 from being misaligned during installation and keep the installed pipe 2 and the gasket tube 4 relatively fixed between the protrusion 31.

[0024] Furthermore, the excess grease will be scraped into the gasket tube 4 by the oiling part 11, but the internal space of the gasket tube 4 is limited. After being lubricated by multiple pipes, the excess grease will not accumulate at the bottom opening of the pipe 4, but will accumulate in the gasket tube 4. Therefore, in order to avoid this situation, in step S1, at least one oil drain hole 41 is provided at a position close to the table 1 of the gasket tube 4. In step S1a, a avoidance cavity 33 corresponding to the position of the oil drain hole 41 is provided on the positioning base 3, and the avoidance cavity 33 is connected to the positioning hole 34. In step S3, the excess grease can be discharged from the oil drain hole 41 and the avoidance cavity 33 after entering the gasket tube 4. The excess grease scraped into the gasket tube can be discharged through the oil drain hole and the avoidance cavity, avoiding excessive accumulation of grease in the gasket tube.

[0025] Furthermore, after step S3, there are steps related to recovering grease: S4: Remove the lubricated pipe 2; S5: repeating steps S2-S4 to lubricate the plurality of pipe fittings 2; after the plurality of pipe fittings 2 are lubricated, the excess grease discharged through the oil drain hole 41 and the avoidance cavity 33 will mostly adhere to the table 1; S6: Remove the positioning base 3 and the gasket tube 4 from the table top 1 in turn, and clean the grease adhering to the table top 1 in a centralized manner; the grease that enters the gasket tube 4 and adheres to the table top 1 can be centrally cleaned and recycled, without causing material waste.

[0026] Furthermore, while positioning the high pipe 3 and the pipe fitting 2, the positioning base 3 itself cannot move laterally relative to the table 1. When the grease is concentrated, it must be removable from the table 1. Therefore, the positioning base 3 should be connected to the table in a detachable manner. Specifically, in step S1, a plurality of screw holes are provided on the table 1. In step S1a, a through hole 32 corresponding to the position of the screw hole is provided on the positioning base 3. In step S2, the screw passes through the through hole 32 and is screwed into the screw hole to fix the positioning base 3 on the table 1. In step S6, the screw is removed to separate the positioning base 3 from the table 1. The screw connection method has a good connection effect, so that the positioning base can form a stable positioning effect on the pipe fitting and the high pipe. The screw is also very convenient to remove, so that the positioning base can be quickly removed from the table.

[0027] Furthermore, when the pipe fitting 2 is installed or disassembled, it is inevitable that it will collide with the positioning base 3. The pipe fitting 2 is made of metal. In order to avoid collision damage to the pipe fitting 2, in step S1a, the positioning base 3 is made of plastic or nylon with a hardness lower than that of metal; so that in steps S2 and S4, the positioning base 3 protects the pipe fitting 2 when it contacts with the pipe fitting 2, so that the outer wall of the pipe fitting 2 is not scratched, thereby improving the yield rate of the pipe fitting 2.

[0028] Furthermore, the length of the gasket tube 4 refers to the distance from the top of the gasket tube 4 to the bottom of the gasket tube 4, and the length of the gasket tube 4 is much smaller than the pipe 2; specifically, the length range of the gasket tube 4 is 20mm-80mm, which is relatively reasonable, so that the gasket tube 4 can raise the pipe 2 and ensure that the retracted oil coating portion 11 can completely return to the gasket tube 4, so that the lubricating oil layer on the inner wall of the pipe 2 is more uniform.

[0029] Example 2: Figure 8 As shown, the difference between this embodiment and the above embodiment is that the positioning base 3 in this embodiment has a different structure from the positioning base 3 in the above embodiment; specifically, between steps S1 and S2, there is a step: S1a: Pre-set positioning base 3; the positioning base 3 is provided with a positioning hole 34 matching the outer diameter and cross-sectional shape of the gasket tube 4, and the positioning hole 34 penetrates the positioning base 3; S1b: Connect the positioning base 3 to the position on the table 1 corresponding to the pad tube 4, and make the top of the pad tube 4 not higher than the top of the positioning hole 34; In step S2, when the bottom end of the pipe 2 to be lubricated abuts against the top end of the gasket tube 4, the pipe 2 and the gasket tube 4 are in the positioning hole 34 and are in close contact with the inner wall of the positioning hole 34. The positioning hole 34 forms an embracing effect on the abutting pipe 2 and the gasket tube 4 to prevent the pipe 2 and the gasket tube 4 from being misaligned during installation, so as to achieve the same positioning effect as in the above embodiment.

[0030] Example 3: Fig. 9 As shown, the difference between this embodiment and the above-mentioned embodiment is that the gasket tube 2 is connected to the table top by screws, and when the bottom end of the pipe 2 is against the top end of the gasket tube 4, the pipe 2 can be prevented from being misaligned during installation; specifically, in step S1, a plurality of threaded holes are provided on the table top 1, and at least one support plate 42 extending outward and attached to the table top 1 is provided at the edge position of the bottom opening of the gasket tube 4, and the support plate 42 is provided with a through hole 43 corresponding to the position of the threaded hole; in step S2, the screw passes through the through hole 43 and is screwed into the threaded hole to connect the support plate 42 to the table top 1; the gasket tube 4 connected to the table top 1 by the screw will not be laterally offset when supporting the bottom end of the pipe 2, which will cause misalignment between the pipe 2 and the gasket tube 4, thereby ensuring the smooth progress of the lubrication process to achieve the positioning effect of the pipe 2.

[0031] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A pipe lubrication method, characterized in that: The following steps are involved: S1: Select and place a gasket tube (4); select a section of the gasket tube (4) that matches the cross-sectional shape and diameter parameters of the pipe (2) to be lubricated, and then place the gasket tube (4) on the table (1) of the machine, and make the oiling portion (11) on the table that can be extended up and down completely within the enclosed space of the gasket tube (4); S2: placing the pipe (2); placing the bottom end of the pipe (2) to be lubricated against the top end of the gasket tube (4), and aligning the pipe (2) with the gasket tube (4); S3: Lubrication; controlling the oiling portion (11) to extend upward from the enclosed space of the gasket tube (4) into the pipe fitting (2) to spray grease, and then the oiling portion (11) to retract downward and cross the junction between the gasket tube (4) and the pipe fitting (2) and then completely return to the enclosed space of the gasket tube (4), so that the oiling portion (11) spreads the grease evenly on the inner wall of the pipe fitting (2) and scrapes excess grease into the gasket tube (4).

2. A pipe lubrication method according to claim 1, characterized in that: The machine platform is provided with a support frame extending upward, with a pressing plate (5) at the top of the support frame, and a driving cylinder (51) is connected to the pressing plate (5). In step S2, when the bottom end of the pipe (2) to be lubricated abuts against the top end of the gasket pipe (4), the driving cylinder (51) acts on the pressing plate (5) to move downward and press the top end of the pipe (2), so that the gasket pipe (4) and the pipe (2) remain relatively fixed on the table (1).

3. A pipe lubrication method according to claim 1, characterized in that: Between steps S1 and S2, there are steps: S1a: A pre-positioned positioning base (3); the positioning base (3) has a positioning hole (34) that matches the outer diameter and cross-sectional shape of the gasket tube (4), and the positioning hole (34) passes through the positioning base (3); a top end of the positioning base (3) is provided with a plurality of protrusions (31) arranged around the positioning hole (34), and the inner side surface of the protrusion (31) matches the outer wall surface of the gasket tube (4), S1b: Connect the positioning base (3) to the position on the table (1) corresponding to the gasket tube (4), so that the top end of the gasket tube (4) passes through the positioning hole (34) and is in close contact with the inner side surface of the protrusion (31), and ensure that the top end of the protrusion (31) exceeds the top end of the gasket tube (4), so as to form an installation guide for the pipe (2); In step S2, when the bottom end of the pipe (2) to be lubricated abuts against the top end of the gasket tube (4), the inner side surface of the protrusion (31) is in close contact with both the gasket tube (4) and the pipe (2) to prevent the pipe (2) and the gasket tube (4) from being misaligned during installation.

4. A pipe lubrication method according to claim 1, characterized in that: Between steps S1 and S2, there are steps: S1a: pre-setting a positioning base (3); the positioning base (3) is provided with a positioning hole (34) matching the outer diameter and cross-sectional shape of the gasket tube (4), and the positioning hole (34) penetrates the positioning base (3); S1b: Connecting the positioning base (3) to a position on the table (1) corresponding to the gasket tube (4), and ensuring that the top of the gasket tube (4) does not exceed the top of the positioning hole (34); In step S2, when the bottom end of the pipe (2) to be lubricated abuts against the top end of the gasket tube (4), the pipe (2) and the gasket tube (4) are located in the positioning hole (34) and are in close contact with the inner wall of the positioning hole (34).

5. A pipe lubrication method according to claim 3 or 4, characterized in that: In step S1, at least one oil drain hole (41) is provided at a position of the gasket tube (4) close to the table top (1); in step S1a, a bypass cavity (33) corresponding to the position of the oil drain hole (41) is provided on the positioning base (3), and the bypass cavity (33) is connected to the positioning hole (34); in step S3, excess grease enters the gasket tube (4) and can be discharged from the oil drain hole (41) and the bypass cavity (33).

6. A pipe lubrication method according to claim 5, characterized in that: After step S3, there are steps: S4: Remove the lubricated pipe (2); S5: repeating steps S2-S4 to lubricate multiple pipe fittings (2); S6: Remove the positioning base (3) and the gasket tube (4) from the table top (1) in sequence, and clean the grease adhering to the table top (1) in a centralized manner.

7. A pipe lubrication method according to claim 6, characterized in that: In step S1, a plurality of screw holes are provided on the table top (1); in step S1a, a through hole (32) corresponding to the position of the screw hole is provided on the positioning base (3); in step S2, a screw is passed through the through hole (32) and screwed into the screw hole, so that the positioning base (3) is fixed on the table top (1); and in step S6, the screw is removed, so that the positioning base (3) is separated from the table top (1).

8. A pipe lubrication method according to claim 6, characterized in that: The pipe fitting (2) is made of metal. In step S1a, the positioning base (3) is made of plastic or nylon having a lower hardness than metal. This allows the positioning base (3) to protect the pipe fitting (2) when in contact with the pipe fitting (2) in steps S2 and S4.

9. A pipe lubrication method according to claim 1, characterized in that: In step S1, a plurality of threaded holes are provided on the table top (1), and at least one support plate (42) extending outward and attached to the table top (1) is provided at the edge of the bottom opening of the gasket tube (4), and a through hole (43) corresponding to the position of the threaded hole is provided on the support plate (42); in step S2, a screw passes through the through hole (43) and is screwed into the threaded hole, so that the support plate (42) is connected to the table top (1).

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