Needle roller bearing quantitative grease injection assembly machine

Abstract

The present invention relates to the technical field of needle roller bearings, and in particular to a quantitative grease injection assembly machine for needle roller bearings, comprising a bearing mechanism, on which a needle roller loading mechanism, an assembly mechanism and a grease delivery mechanism are arranged; a lifting and mounting part, which is configured to move in the X-axis direction and the vertical Z-axis direction on a parallel plane lateral to the bearing mechanism, on which a grease injection mechanism for adsorbing needle rollers and quantitatively injecting grease into the bearing is vertically installed; the needle roller loading mechanism, the assembly mechanism and the grease delivery mechanism are all located on parallel planes, the grease injection mechanism docks with the needle roller loading mechanism to adsorb the needle rollers in the needle roller loading mechanism through the grease injection mechanism, the grease injection mechanism docks with the outer ring of the bearing loaded on the assembly mechanism to load the needle roller into the bearing, and the grease injection mechanism docks with the grease delivery mechanism to replenish grease. The present invention uses the grease injection mechanism to install needles and quantitatively inject grease into the bearing, thereby reducing the loss of grease, and also reducing the production cost and labor cost, while realizing the grease injection and needle installation operations in the bearing.

Description

Technical Field

[0001] The invention relates to the technical field of needle roller bearings, in particular to a quantitative grease injection assembly machine for needle roller bearings. Background Art

[0002] Automobiles need to use various needle roller bearings. Needle rollers are usually machined on machine tools to complete the turning of the main journal, drilling of the center hole and machining of the end surface. During installation, the operator first applies grease to the inner raceway of the center hole of the bearing, and then places the needle rollers close to the grease at the installation location. In this way, the amount of grease injected cannot be effectively controlled, and excess grease often overflows, and manual grease application will have a certain loss, which causes grease waste. In addition, manual weighing and metering of grease is required, which makes the labor intensity of operators high and the production efficiency low. In addition, the amount of grease consumed by needle roller bearings is huge, which will incur high costs during mass production. At the same time, the operators' hands will be directly exposed to grease for a long time, which can easily cause skin corrosion, and thus health and safety cannot be effectively guaranteed. Therefore, an automatic oiling mechanism is used in conjunction with automatic assembly equipment to assemble needle rollers and inject grease, thereby reducing the labor intensity of operators and improving work efficiency. However, when the automatic oiling mechanism is injecting grease, since it is necessary to pressurize the oil channel inside the automatic assembly equipment, there are bubbles in the oil channel inside the automatic assembly equipment, which will cause the grease in the oil channel to fail to overflow continuously and fail to adsorb the needle roller, thereby causing an unsatisfactory assembly effect and low assembly efficiency. Summary of the invention

[0003] The present invention aims to solve the above-mentioned defects and provides a quantitative grease injection assembly machine for needle roller bearings.

[0004] In order to overcome the defects in the background technology, the technical solution adopted by the present invention to solve the technical problem is: a quantitative grease injection assembly machine for needle roller bearings, comprising a bearing mechanism, on which a needle roller loading mechanism, an assembly mechanism and a grease delivery mechanism are arranged;

[0005] A lifting and lowering installation part, which is configured to move along the X-axis direction and the vertical Z-axis direction on a parallel plane lateral to the bearing mechanism, and a grease injection mechanism for adsorbing the needle roller and injecting quantitative grease into the bearing is vertically installed thereon;

[0006] A further improvement includes that the needle roller loading mechanism, assembly mechanism and grease delivery mechanism are all located on the parallel plane, the grease injection mechanism moves on the parallel plane to the side of the support mechanism to just above the needle roller loading mechanism and docks with the needle roller loading mechanism so that the arranged needle rollers in the needle roller loading mechanism can be adsorbed by the grease injection mechanism, the grease injection mechanism moves on the parallel plane to the side of the support mechanism to just above the assembly mechanism and docks with the outer ring of the bearing loaded on the assembly mechanism so that the needle roller is loaded into the bearing and precise quantitative grease is injected at the same time, and the grease injection mechanism moves on the parallel plane to the side of the support mechanism to just above the grease delivery mechanism and docks with the grease delivery mechanism so as to replenish grease in the grease injection mechanism.

[0007] A further improvement includes that the lifting and lowering installation part moves on a parallel plane to the side of the carrying mechanism through a moving mechanism installed laterally to the carrying mechanism.

[0008] A further improvement includes that the moving mechanism includes a horizontal guide rail laid on the side of the carrying mechanism, a moving plate and a vertical guide rail laid on the moving plate, a slider B connected to the moving plate is slidably set on the horizontal guide rail to enable the moving plate to move in the X-axis direction, a slider A connected to the lifting installation part is slidably set on the vertical guide rail to enable the lifting installation part to move in the Z-axis direction, a driving motor is installed on the moving plate, a gear connected to the output end of the driving motor is meshed with a rack installed on the carrying mechanism, and the output end of the lifting cylinder installed on the moving plate is connected to the lifting installation part.

[0009] A further improvement includes that the needle loading mechanism comprises a needle loading disk with a circular ring structure, a piston cavity with a ring structure and a plurality of radially distributed needle loading cavities are provided in the needle loading disk, the needle loading cavity is located in the piston cavity and connected to the piston cavity, the needle loading disk has axially provided needle holes which are respectively connected to the needle loading cavities and used for placing the needle rollers, and the needle loading cavity is provided with a pushing block which is used for piston movement and pushing the needle roller to contact the grease injection mechanism, and the needle loading disk is provided with a connecting tube which is connected to the piston cavity.

[0010] A further improvement includes a loading chamber for accommodating a baffle plate on the inner wall of the needle loading chamber, one end of the baffle plate being rotatably disposed in the loading chamber via a rotating shaft, a thrust spring being connected between the baffle plate and the inner wall of the loading chamber, thereby pushing the baffle plate via the thrust spring to limit the movement of the roller needle in the needle loading chamber.

[0011] A further improvement includes that the assembly mechanism includes a mounting plate and a bearing positioning cylinder connected to the support mechanism, and a bearing positioning cylinder for loading the bearing outer ring is arranged above the mounting plate.

[0012] Further improvements include arranging a double cylinder under the mounting plate, and the output ends of the double cylinder are respectively connected to the limit plates to assist in keeping the needle roller in the outer ring of the bearing, the double cylinder drives the limit plates to dock with each other, and the docking ends of the limit plates are respectively provided with special-shaped openings that match the shape of the grease injection mechanism and are used to accommodate the grease injection mechanism.

[0013] Further improvements include that the grease injection mechanism includes a grease injection cylinder with a grease injection cavity inside and a driving unit installed on the grease injection cylinder, a plurality of needle loading grooves matching the shape of the needle roller and embedded in the needle roller are equidistantly provided on the butt end surface of the grease injection cylinder, a grease outlet hole for injecting the grease in the grease injection cavity into the needle loading groove is provided between the needle loading groove and the grease injection cavity, the output end of the driving unit is inserted into the grease injection cavity and connected to the piston, and a grease injection joint is provided at the butt end of the grease injection cylinder for inputting grease after docking with the grease delivery mechanism.

[0014] A further improvement includes that the grease injection joint includes a joint body, an axial delivery hole for delivering grease into the grease injection cavity, a radial contraction cavity for loading a contraction block and a strong spring, and the contraction cavity intersects the delivery hole vertically, one end of the strong spring is connected to the contraction block so as to push the contraction block to extend to the outside, and the other end is connected to the bottom wall of the contraction cavity, a through hole for passing grease is provided on the contraction block, and under normal conditions, the through hole and the delivery hole are staggered under the action of the strong spring, and when the joint body is docked with the grease delivery mechanism, the contraction block is contracted into the contraction cavity so that the through hole coincides with the delivery hole.

[0015] A further improvement includes that the fat delivery mechanism includes a mounting member arranged on the supporting mechanism and a docking sleeve arranged on the mounting member, and the docking sleeve is connected to the external fat delivery mechanism through a fat delivery tube.

[0016] The beneficial effects of the present invention are as follows: the present invention adopts an automated design to inject grease and install needles in bearings, and the grease injection mechanism is used to install needles and quantitatively inject grease into the bearings, which reduces the loss of grease during use, reduces production costs and labor costs, and realizes the grease injection and needle installation operations on the bearings at the same time, with a high degree of automation; the special structure of the grease injection mechanism utilizes negative pressure to adsorb the roller needle, and pressurizes the grease into the grease injection cavity to squeeze out the grease, without the influence of air bubbles, thereby ensuring the accuracy of quantitative grease injection in the bearings; the special structure of the needle roller loading mechanism can realize the synchronous adsorption of the roller needle by the grease injection mechanism, greatly improving the assembly efficiency and saving assembly time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1It is a front view of the present invention;

[0019] Figure 2 is a left side view of the present invention (the fat delivery mechanism is not shown);

[0020] Figure 3 is a top view of the assembly mechanism of the present invention;

[0021] Figure 4 is a cross-sectional view of the grease injection mechanism of the present invention;

[0022] Figure 5 is a cross-sectional view of the fat delivery mechanism of the present invention;

[0023] Figure 6 is a top view of the needle roller loading mechanism of the present invention;

[0024] Figure 7 yes Figure 6 Middle A enlarged view;

[0025] In the figure, 1-needle loading mechanism, 2-docking sleeve, 3-grease injection mechanism, 4-horizontal guide rail, 5-rack, 6-lifting cylinder, 7-moving plate, 8-driving motor, 9-lifting installation part, 10-assembly mechanism, 11-installation piece, 12-fat delivery tube, 13-carrying mechanism, 14-vertical guide rail, 15-slider A, 16-slider B, 17-gear;

[0026] 101-needle hole, 102-piston chamber, 103-needle loading chamber, 104-pushing block, 105-needle loading plate, 106-needle, 107-thrust spring, 108-loading chamber, 109-baffle, 110-rotating shaft, 111-connecting pipe;

[0027] 301-driving part, 302-grease injection cylinder, 303-grease outlet hole, 304-piston, 305-grease injection cavity, 306-needle installation groove, 307-grease injection connector;

[0028] 3071-contraction block, 3072-delivery hole, 3073-strong spring, 3074-through hole, 3075-contraction cavity, 3076-connector body;

[0029] 1001-mounting plate, 1002-limiting plate, 1003-bearing positioning cylinder, 1004-special-shaped mouth, 1005-double cylinder. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in 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.

[0031] according to Figure 1 and Figure 2 , a quantitative grease injection assembly machine for needle roller bearings, comprising a bearing mechanism 13, on which a needle roller loading mechanism 1, an assembly mechanism 10 and a grease delivery mechanism are arranged;

[0032] A lifting and lowering installation part 9, which is configured to move in the X-axis direction and the vertical Z-axis direction on the parallel plane of the lateral side of the bearing mechanism 13, and a grease injection mechanism 3 for adsorbing the needle roller 106 and quantitatively injecting grease into the bearing is vertically installed thereon;

[0033] The needle roller loading mechanism 1, the assembly mechanism 10 and the grease delivery mechanism are all located on the parallel planes. The grease delivery mechanism 3 moves on the parallel planes to the side of the support mechanism 13 to just above the needle roller loading mechanism 1 and docks with the needle roller loading mechanism 1 so that the arranged needle rollers 106 in the needle roller loading mechanism 1 can be adsorbed by the grease delivery mechanism 3. The grease delivery mechanism 3 moves on the parallel planes to the side of the support mechanism 13 to just above the assembly mechanism 10 and docks with the outer ring of the bearing loaded on the assembly mechanism 10 so that the needle roller 106 can be loaded into the bearing while performing precise quantitative grease delivery. The grease delivery mechanism 3 moves on the parallel planes to the side of the support mechanism 13 to just above the grease delivery mechanism and docks with the grease delivery mechanism so as to replenish grease in the grease delivery mechanism 3, thereby enabling continuous operation.

[0034] In a further embodiment, at least two lifting installation parts 9 may be provided to achieve continuous assembly and further improve assembly efficiency.

[0035] In this embodiment, if Figure 1 and Figure 2As shown, the lifting installation part 9 moves on a parallel plane to the side of the carrying mechanism 13 through a moving mechanism installed on the side of the carrying mechanism 13. In a further embodiment, the moving mechanism includes a horizontal guide rail 4 laid on the side of the carrying mechanism 13, a moving plate 7, and a vertical guide rail 14 laid on the moving plate 7. A slider B16 connected to the moving plate 7 is slidably provided on the horizontal guide rail 4 so that the moving plate 7 moves in the X-axis direction. A slider A15 connected to the lifting installation part 9 is slidably provided on the vertical guide rail 14 so that the lifting installation part Part 9 moves in the Z-axis direction, a driving motor 8 is installed on the moving plate 7, and a gear 17 connected to the output end of the driving motor 8 is meshed with a rack 5 installed on the supporting mechanism 13 to drive the moving plate 7 to automatically move in the X-axis direction. The output end of the lifting cylinder 6 installed on the moving plate 7 is connected to the lifting installation part 9 and then drives the lifting installation part 9 to automatically move in the Z-axis direction. Through the above embodiment, the lifting installation part 9 can automatically move along the X-axis direction and the vertical Z-axis direction on the lateral parallel plane of the supporting mechanism 13.

[0036] In this embodiment, if Figure 6 As shown, the needle loading mechanism 1 comprises a needle loading plate 105 of annular structure, wherein the needle loading plate 105 is provided with a piston cavity 102 of annular structure and a plurality of needle loading cavities 103 distributed radially, wherein the needle loading cavity 103 is located in the piston cavity 102 and connected to the piston cavity 102, and the needle loading plate 105 is provided with a needle hole 101 axially connected to the needle loading cavity 103 and used for placing the needle roller 106, and the needle loading cavity 103 is provided with a piston for piston movement and pushing the needle roller 106 to contact with the grease injection machine The pushing block 104 contacts the grease injection mechanism 3, and the needle loading disk 105 is provided with a connecting pipe 111 for communicating with the piston chamber 102. In order to enable the pushing block 104 to perform piston movement in the needle loading chamber 103, the connecting pipe 111 is connected to the two-way vacuum pump through a pipeline. The vacuum pump forms negative pressure and positive pressure in the piston chamber 102 to move the pushing block 104 in the needle loading chamber 103. The pushing block 104 pushes the needle roller 106 to make it contact with the grease injection mechanism 3 inserted into the inner hole of the needle loading disk 105, so that the grease injection mechanism 3 absorbs the needle roller 106.

[0037] Further embodiments, such as Figure 7As shown, a loading chamber 108 for accommodating a baffle 109 is provided on the inner wall of the needle loading chamber 103, one end of the baffle 109 is rotatably disposed in the loading chamber 108 via a rotating shaft 110, a thrust spring 107 is connected between the baffle 109 and the inner wall of the loading chamber 108, so that the baffle 109 is pushed by the thrust spring 107 to limit the movement of the needle roller 106 in the needle loading chamber 103, the baffle 109 cooperates with the pushing block 104 to form a space for accommodating the needle roller 106, the pushing block 104 pushes the needle roller 106 so that the baffle 109 compresses the thrust spring 107, and then the baffle 109 is hidden in the loading chamber 108, the pushing block 104 can push the needle roller 106 to contact with the grease injection mechanism 3, so that the grease injection mechanism 3 can absorb the needle roller 106 and then carry out subsequent assembly processes.

[0038] In this embodiment, if Figure 1 and Figure 3 As shown, the assembly mechanism 10 includes a mounting plate 1001 and a bearing positioning cylinder 1003 connected to the supporting mechanism 13. A bearing positioning cylinder 1003 for loading the bearing outer ring is arranged above the mounting plate 1001. The bearing outer ring is embedded in the bearing positioning cylinder 1003 to achieve precise positioning, so as to facilitate the precise docking of the grease injection mechanism 3 with the bearing outer ring, thereby accurately inserting it into the bearing outer ring.

[0039] In order to ensure that the needle roller 106 can remain in the outer ring of the bearing after the grease injection mechanism 3 is inserted into the outer ring of the bearing, and to prevent the needle roller 106 from being lifted up when the grease injection mechanism 3 is lifted up, a double cylinder 1005 is arranged under the mounting plate 1001, and the output ends of the double cylinder 1005 are respectively connected to the limit plates 1002 to assist the needle roller 106 to remain in the outer ring of the bearing, and the double cylinder 1005 drives the limit plates 1002 to dock with each other, and the docking ends of the limit plates 1002 are respectively provided with special-shaped openings 1004 that match the shape of the grease injection mechanism 3 and are used to accommodate the grease injection mechanism 3.

[0040] In this embodiment, if Figure 4As shown, the grease injection mechanism 3 includes a grease injection cylinder 302 with a grease injection cavity 305 inside and a driving unit 301 installed on the grease injection cylinder 302. The surface of the butt end of the grease injection cylinder 302 is equidistantly provided with a plurality of needle grooves 306 that match the shape of the needle roller 106 and are embedded in the needle roller 106. A grease outlet hole 303 is provided between the needle groove 306 and the grease injection cavity 305 for injecting the grease in the grease injection cavity 305 into the needle groove 306. The output end of the driving unit 301 is inserted into the grease injection cavity 305 and connected to the piston 304, thereby driving the piston 304 makes piston motion in the grease injection chamber 305, which is used to absorb the roller needle 106 and quantitatively inject grease. In order to be able to replenish grease in the grease injection cylinder 302 in time, the butt end of the grease injection cylinder 302 is provided with a grease injection connector 307 for inputting grease after docking with the grease delivery mechanism. The grease injection connector 307 can be connected to the grease delivery mechanism to fill the grease in the grease injection chamber 305. The grease outlet hole 303 adopts a small hole design. Under normal circumstances, grease is not easy to flow out of the grease outlet hole 303, and the grease needs to be pressurized by the piston 304 to push the grease out of the grease injection chamber 305.

[0041] In order to make the grease injection joint 307 and the grease delivery mechanism connected when they are connected, to prevent the grease from overflowing through the grease injection joint 307 when the piston 304 moves, or to prevent the air from entering through the grease injection joint 307. Figure 5 As shown, the grease injection joint 307 includes a joint body 3076, wherein the joint body 3076 has an axial delivery hole 3072 for delivering grease into the grease injection cavity 305, and a radial contraction cavity 3075 for loading a contraction block 3071 and a strong spring 3073, and the contraction cavity 3075 intersects the delivery hole 3072 vertically, one end of the strong spring 3073 is connected to the contraction block 3071 so as to push the contraction block 3071 to extend to the outside, and the other end is connected to the bottom wall of the contraction cavity 3075 so as to load the strong spring The spring 3073 exerts a continuous thrust on the shrinkage block 3071. The shrinkage block 3071 is provided with a through hole 3074 for passing grease. Under normal circumstances, the through hole 3074 and the delivery hole 3072 are staggered under the action of the strong spring 3073. When the joint body 3076 is docked with the grease delivery mechanism, the shrinkage block 3071 shrinks into the shrinkage cavity 3075 so that the through hole 3074 and the delivery hole 3072 coincide with each other. At this time, the grease can be delivered into the grease injection cavity 305 through the through hole 3074 and the delivery hole 3072.

[0042] In this embodiment, if Figure 1 and Figure 5The liposuction mechanism includes a mounting member 11 disposed on the supporting mechanism 13 and a docking sleeve 2 disposed on the mounting member 11. The docking sleeve 2 is connected to an external liposuction pump through a liposuction tube 12, so that the liposuction mechanism 3 can be regularly supplemented with grease.

[0043] Working principle: Before use, the grease injection mechanism 3 needs to be filled with grease inside through the grease delivery mechanism. Mainly, when the grease injection mechanism 3 is docked with the grease delivery mechanism, when the docking sleeve 2 is docked with the grease injection joint 307, the docking sleeve 2 presses the contraction block 3071 into the contraction cavity 3075. This step will make the delivery hole 3072 coincide with the through hole 3074, and then conduct the grease to be input into the grease injection cavity 305 through the delivery hole 3072 and the through hole 3074. At the same time, the piston 304 moves together until the grease injection cavity 305 is filled with grease. In this process, no air is mixed inside, which can ensure the accuracy of quantitative grease delivery.

[0044] After the grease is filled in the grease injection mechanism 3, the moving mechanism drives the grease injection mechanism 3 to be lifted to a certain height in the Z-axis direction, and drives it to move in the X-axis direction to just above the needle loading mechanism 1. The manipulator places the needle roller 106 into the needle roller hole 101, and places the retaining frame in the inner ring of the needle loading plate 105. The moving mechanism drives the grease injection mechanism 3 to descend in the Z-axis direction and insert it into the retaining frame. At this time, the driving unit 301 drives the piston 304 to compress the grease injection cavity 305. A part of the grease in the grease injection cavity 305 will be squeezed out from the grease outlet hole 303 into the needle loading groove 306, so that the inner wall thereof is adhered to the grease, and the needle roller 106 entering the needle roller hole 101 falls into the needle loading cavity 103. At this time, the thrust spring 107 pushes the baffle 109 to cooperate with the push block 1 04 makes the needle roller 106 located between the two and keeps in a fixed state. When the vacuum pump inflates the piston chamber 102, the air pressure pushes the push block 104 to move. The push block 104 drives the needle roller 106 to push the baffle 109 to compress the thrust spring 107. The baffle 109 is also hidden in the loading chamber 108. The push block 104 pushes the needle roller 106 to contact with the grease injection mechanism 3, so that the needle roller 106 is embedded in the needle loading groove 306. The needle roller 106 contacts the grease on the inner wall of the needle loading groove 306, and then the grease absorbs the needle roller 106. After completing this action, the driving unit 301 drives the piston 304 to reset to generate negative pressure in the grease injection chamber 305, and then absorbs the needle roller 106 through the grease outlet hole 303. The grease also plays a certain sealing role to ensure the stability of the adsorption.

[0045] After the grease injection mechanism 3 completes the needle installation process, the moving mechanism drives the grease injection mechanism 3 to be lifted to a certain height in the Z-axis direction, and drives it to move in the X-axis direction to just above the assembly mechanism. The manipulator places the outer ring of the bearing in the bearing positioning cylinder 1003, and the grease injection mechanism 3 descends and docks with the bearing positioning cylinder 1003, and places the needle roller 106 and the retaining frame into the outer ring of the bearing. At this time, the driving unit 301 drives the piston 304 to pressurize the grease injection cavity 305 again, and the grease in the grease injection cavity 305 is quantitatively injected into the bearing for lubrication. At this time, there is no adsorption force on the needle roller 106, and the grease injection mechanism 3 can be lifted by the moving mechanism. At the same time, the output ends of the double cylinder 1005 respectively drive the limit plates 1002 to move and dock. The limit plates 1002 keep the needle roller 106 and the retaining frame in the outer ring of the bearing to avoid being lifted together when the grease injection mechanism 3 is lifted. The above steps are used to achieve quantitative grease injection and needle installation of the bearing.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A needle bearing quantitative grease injection assembly machine, characterized in that: It comprises a bearing mechanism (13) on which a needle loading mechanism (1), an assembly mechanism (10) and a fat delivery mechanism are arranged; A lifting and lowering installation part (9) is configured to move in an X-axis direction and a vertical Z-axis direction on a parallel plane lateral to the bearing mechanism (13), and a grease injection mechanism (3) for adsorbing the needle roller (106) and capable of quantitatively injecting grease into the bearing is vertically installed on the lifting and lowering installation part (9); The needle roller loading mechanism (1), the assembly mechanism (10) and the grease delivery mechanism are all located on the parallel plane. The grease delivery mechanism (3) moves on the parallel plane to the side of the bearing mechanism (13) to the top of the needle roller loading mechanism (1) and docks with the needle roller loading mechanism (1) so that the needle rollers (106) arranged in the needle roller loading mechanism (1) are adsorbed by the grease delivery mechanism (3). The grease delivery mechanism (3) moves on the parallel plane to the side of the bearing mechanism (13) to the top of the assembly mechanism (10) and docks with the outer ring of the bearing loaded on the assembly mechanism (10) so that the needle rollers (106) are loaded into the bearing and grease is accurately and quantitatively injected at the same time. The grease delivery mechanism (3) moves on the parallel plane to the side of the bearing mechanism (13) to the top of the grease delivery mechanism and docks with the grease delivery mechanism so as to replenish grease in the grease delivery mechanism (3). The grease injection mechanism (3) comprises a grease injection cylinder (302) having a grease injection cavity (305) therein and a driving unit (301) mounted on the grease injection cylinder (302); a plurality of needle loading grooves (306) matching the shape of the roller needle (106) and embedded in the roller needle (106) are equidistantly provided on the butt end surface of the grease injection cylinder (302); a groove (306) is provided between the needle loading groove (306) and the grease injection cavity (305) for injecting grease in the grease injection cavity (305) into the needle loading groove (306); and a groove (306) is provided between the needle loading groove (306) and the grease injection cavity (305) for injecting grease in the grease injection cavity (305) into the needle loading groove (306). The output end of the driving unit (301) is inserted into the grease injection cavity (305) and connected to the piston (304). The butt-jointed end of the grease injection cylinder (302) is provided with a grease injection joint (307) for inputting grease after being butt-jointed with the grease delivery mechanism. The driving unit (301) drives the piston (304) to generate negative pressure in the grease injection cavity (305), thereby adsorbing the roller needle (106) through the grease outlet hole (303).

2. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 1, characterized in that: The lifting and lowering installation part (9) moves on a plane parallel to the side of the supporting mechanism (13) via a moving mechanism installed laterally on the supporting mechanism (13).

3. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 2, characterized in that: The moving mechanism comprises a horizontal guide rail (4) laid on the side of the bearing mechanism (13), a moving plate (7) and a vertical guide rail (14) laid on the moving plate (7); a slider B (16) connected to the moving plate (7) is slidably arranged on the horizontal guide rail (4) so ​​that the moving plate (7) moves in the X-axis direction; a slider A (15) connected to the lifting installation part (9) is slidably arranged on the vertical guide rail (14) so ​​that the lifting installation part (9) moves in the Z-axis direction; a driving motor (8) is installed on the moving plate (7); a gear (17) connected to the output end of the driving motor (8) is meshed with a rack (5) installed on the bearing mechanism (13); and the output end of the lifting cylinder (6) installed on the moving plate (7) is connected to the lifting installation part (9).

4. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 1, characterized in that: The needle loading mechanism (1) comprises a needle loading plate (105) of an annular structure, wherein a piston cavity (102) of an annular structure and a plurality of needle loading cavities (103) distributed radially are provided in the needle loading plate (105), wherein the needle loading cavity (103) is located in the piston cavity (102) and connected to the piston cavity (102), wherein needle holes (101) are axially provided on the needle loading plate (105) and are respectively connected to the needle loading cavities (103) and used for receiving needle rollers (106), and wherein a pushing block (104) is provided in the needle loading cavity (103) for performing piston movement and pushing the needle roller (106) to contact the grease injection mechanism (3), and wherein a connecting tube (111) for communicating with the piston cavity (102) is provided on the needle loading plate (105).

5. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 4, characterized in that: A loading chamber (108) for accommodating a baffle (109) is provided on the inner wall of the needle loading chamber (103); one end of the baffle (109) is rotatably disposed in the loading chamber (108) via a rotating shaft (110); a thrust spring (107) is connected between the baffle (109) and the inner wall of the loading chamber (108), so that the baffle (109) is pushed by the thrust spring (107) to limit the movement of the roller needle (106) in the needle loading chamber (103).

6. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 1, characterized in that: The assembly mechanism (10) comprises a mounting plate (1001) and a bearing positioning cylinder (1003) connected to the bearing mechanism (13); a bearing positioning cylinder (1003) for loading a bearing outer ring is arranged above the mounting plate (1001).

7. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 6, characterized in that: A double cylinder (1005) is arranged below the mounting plate (1001), and the output ends of the double cylinder (1005) are respectively connected to the limit plates (1002) so as to assist the needle roller (106) to remain in the outer ring of the bearing. The double cylinder (1005) drives the limit plates (1002) to dock with each other, and the docking ends of the limit plates (1002) are respectively provided with special-shaped openings (1004) that match the shape of the grease injection mechanism (3) and are used to accommodate the grease injection mechanism (3).

8. The needle roller bearing quantitative grease injection assembly machine according to claim 1, characterized in that: The grease injection joint (307) comprises a joint body (3076), wherein the joint body (3076) has an axially arranged delivery hole (3072) for delivering grease into the grease injection cavity (305), and a radially arranged contraction cavity (3075) for loading a contraction block (3071) and a strong spring (3073), wherein the contraction cavity (3075) intersects the delivery hole (3072) perpendicularly, and one end of the strong spring (3073) is connected to the contraction block (3071) so as to push the contraction block (3071) to move the contraction block (3071). 1) extends to the outside, and the other end is connected to the bottom wall of the shrinkage cavity (3075), the shrinkage block (3071) is provided with a through hole (3074) for passing grease, and under normal conditions, the through hole (3074) and the delivery hole (3072) are offset under the action of the strong spring (3073), and when the joint body (3076) is docked with the grease delivery mechanism, the shrinkage block (3071) is contracted into the shrinkage cavity (3075) so that the through hole (3074) and the delivery hole (3072) overlap.

9. A needle roller bearing quantitative grease injection assembly machine as claimed in claim 1, characterized in that: The fat delivery mechanism comprises a mounting member (11) arranged on the supporting mechanism (13) and a docking sleeve (2) arranged on the mounting member (11); the docking sleeve (2) is connected to an external fat delivery mechanism via a fat delivery tube (12).

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