A bearing grease injection head, a grease injection system and a grease injection method thereof

Abstract

The application discloses a bearing grease injection head, a grease injection system and a grease injection method thereof, and belongs to the technical field of bearing processing equipment. The system comprises a grease injection head body, a grease supply, a lifting assembly, an exhaust assembly and a trigger assembly. The outer circumferential surface of the grease injection head body is provided with positioning grooves matched with rollers, and oil outlet holes are arranged between the grooves to align the roller gaps. The grease injection head is driven to move downward by the lifting assembly, the first and second pressing plates are caused to relatively displace by the difference in pressing resistance, and then the contact inclined blocks and the driving blocks of the trigger assembly are sequentially driven to rotate the exhaust assembly to open the air suction channel and cause the sealing ring plate to move downward to form a sealing cavity. The structure automatically completes vacuum replacement by mechanical linkage before grease injection, and establishes a negative pressure environment. The application effectively solves the problems that the grease injection holes are easily blocked by the rollers and that air pockets are formed by residual internal air, realizes uniform, full and bubble-free grease filling, and improves the lubrication quality and efficiency.

Description

Technical Field

[0001] This invention relates to the field of bearing processing equipment technology, and in particular to a bearing grease injection head, grease injection system and grease injection method. Background Technology

[0002] In the lubrication process of bearing production lines, the mainstream grease injection method is the use of a pressure injection grease injector. Its working principle involves attaching the grease injector to the bearing end face and using a high-pressure grease pump to directly inject grease into the bearing. This process relies on the flow of grease under pressure, attempting to force out existing air from bearing gaps or pre-installed vents through the newly injected grease, thus completing the filling of the bearing's internal space.

[0003] However, there are drawbacks to using the existing grease injection head. When the existing grease injection head is inserted into the bearing, the position of the oil outlet hole in the circumferential direction is randomly distributed. This can easily lead to the oil outlet hole being directly facing the solid surface of the cylindrical roller during actual operation. When high-viscosity grease is directly sprayed onto the roller surface, the flow path of the grease will be blocked by the roller, resulting in a large back pressure resistance. This prevents the grease from being injected into the deep gaps on both sides of the roller and into the cage pocket along the designed path. Instead, it is forced to overflow outward along the bearing end face gap with less resistance. This flow channel blockage and flow resistance difference caused by the randomness of the grease injection angle results in uneven grease filling in different areas inside the bearing, making it difficult to ensure the consistency and effectiveness of bearing lubrication.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a bearing grease injection head, a grease injection system, and a grease injection method to solve the technical problems in the prior art where the grease injection head is easily blocked by rollers due to the random distribution of the oil outlet position, resulting in obstructed grease injection path and uneven grease filling inside the bearing.

[0006] The embodiments of the present invention adopt the following technical solution: a bearing grease injection head, a grease injection system and a grease injection method thereof, comprising a grease injection head body; The top center of the grease injection head body is provided with a threaded interface, and the inner center of the threaded interface is provided with a tapered part, which is used to divert the incoming grease. The inner wall bottom surface of the threaded interface is provided with several injection holes along the circumferential direction, and the grease injection head body is provided with several oil outlet holes along the circumferential direction near the bottom position, and the oil outlet holes are connected to the injection holes. The outer surface of the grease injection head body is provided with a plurality of positioning grooves at equal intervals along the circumferential direction. The positioning grooves are used to fit and position with the circumferential surface of the cylindrical rollers of the bearing to be greased. The position of each oil outlet hole is set between two adjacent positioning grooves to align the gap between the two cylindrical rollers.

[0007] Furthermore, the device includes the grease injection head body and grease supply assembly as described in claims. The grease supply assembly includes a support platform, a grease reservoir, a grease pump, and a grease injection cylinder. The grease reservoir is fixedly mounted on the support platform. A pressure rod extends movably into the grease reservoir. The bottom of the grease reservoir is connected to the grease pump via a grease outlet pipe. The grease pump is mounted on a valve block seat fixed on the support platform. A drive push rod is movably mounted at one end of the grease pump. The drive push rod is connected to the grease injection cylinder fixed on a fixed base. A stroke adjustment nut in the shape of a hexagonal nut is fitted on the drive push rod to adjust the effective stroke of the grease injection cylinder pushing the drive push rod. The output end of the grease pump is connected to an oil delivery pipe, and the end of the oil delivery pipe communicates with the grease injection head body.

[0008] Furthermore, it also includes a lifting assembly, an exhaust assembly, and a trigger assembly. The lifting assembly is disposed on one side of the grease supply assembly, the grease injection head body is connected to the bottom end of the lifting assembly, the exhaust assembly is disposed inside the bottom end of the lifting assembly and sleeved on the outside of the grease injection head body, and the trigger assembly is disposed on the lifting assembly and cooperates with the exhaust assembly. The lifting assembly is used to drive the grease injection head body and the trigger assembly to move downward, using the resistance difference during the downward movement to generate relative displacement, thereby driving the exhaust assembly to move through the trigger assembly.

[0009] Furthermore, the lifting assembly includes support rods, a top plate, a lifting cylinder, a first lower pressure plate, a first guide rod, a first spring, a second lower pressure plate, a positioning column, a second guide rod, a second spring, and a sealing end cap. The top plate is fixed to the top of the support rods. The lifting cylinder is vertically fixed to the center of the top plate. The first lower pressure plate is horizontally connected to the output end of the lifting cylinder and located below the top plate. The first guide rod is vertically fixed to the first lower pressure plate and moves upward through the top plate. The first spring is sleeved on the first guide rod and connected between the upper surface of the first lower pressure plate and the bottom surface of the top plate. The second lower pressure plate is located below the first lower pressure plate. The second guide rod is fixed on the second lower pressure plate and moves upward through the first lower pressure plate. The second spring is sleeved on the second guide rod and connected between the lower surface of the first lower pressure plate and the upper surface of the second lower pressure plate. The sealing end cap is fixed on the bottom surface of the second lower pressure plate, and its bottom surface has a downward-opening conical groove at the center. The grease injection head body is connected to the center of the bottom surface of the sealing end cap. The positioning pins are symmetrically fixed on the bottom surface of the second lower pressure plate. The support platform is provided with a positioning sleeve that cooperates with the positioning pin to limit the lowest position of the positioning pin's downward movement. The elastic force of the second spring is less than that of the first spring. When the lifting cylinder presses down, the second spring is compressed before the first spring.

[0010] Furthermore, the exhaust assembly includes an annular box, an annular air pipe, and a horizontal displacement rod. A horizontal groove is formed on the circumferential surface of the sealing end cap. The annular box is disposed inside the conical groove on the bottom surface of the sealing end cap and is coaxially sleeved on the grease injection head body. The annular box is connected to the top of the inner wall of the conical groove by a torsion spring. Several vent holes are equidistantly formed on the bottom surface of the annular box. The annular air pipe is disposed inside the annular box. Several suction nozzles are circumferentially formed on the bottom surface of the annular air pipe. The horizontal displacement rod is fixed to the side of the annular air pipe and passes outward through the horizontal groove formed on the annular box and the sealing end cap. In the initial state, the suction nozzles do not correspond to the vent holes. The horizontal displacement rod is used to drive the annular air pipe to rotate under force until the suction nozzles correspond and connect with the vent holes.

[0011] Furthermore, the exhaust assembly also includes a sealing ring plate, an arched frame, a guide shaft, a support spring, and a vertical displacement rod. A vertical waist groove is also formed on the circumferential surface of the sealing end cover. The sealing ring plate is disposed inside the conical groove and located below the annular box, and is horizontally sleeved on the grease injection head body. A sealing ring is provided on the outer ring of the sealing ring plate, and its diameter is adapted to the small diameter end of the conical groove. The arched frame is fixed to the top of the sealing end cover. The guide shaft is fixed on the sealing ring plate and moves upward through the sealing end cover and the arched frame in sequence. A protrusion is fixed on the guide shaft. The support spring is sleeved on the guide shaft, and its two ends are respectively connected to the bottom surface of the protrusion and the upper surface of the sealing end cover to keep the sealing ring plate initially in a suspended position. The vertical displacement rod is fixed on the side of the sealing ring plate and passes through the vertical waist groove. Its end is provided with a contact end. The sealing ring plate is used to move downward when the contact end is pushed by an external force to seal at the small diameter end of the conical groove.

[0012] Furthermore, the triggering component includes a mounting plate, a mounting base, a contact bevel block, and a push plate. The mounting plate is vertically fixed to the bottom surface of the first lower pressure plate and moves downward through the second lower pressure plate. The mounting base is fixed to the side of the mounting plate and located below the second lower pressure plate, with its top end movably embedded in the second lower pressure plate. The contact bevel block is slidably disposed on the end face of the mounting base and has an inclined surface suitable for pushing the horizontal displacement rod. A slot for engaging the horizontal displacement rod is provided on the inclined surface. The push plate is fixed to the mounting base, and a toggle block is fixed to the side of the push plate. The toggle block is used to cooperate with the contact end of the vertical displacement rod. When the first lower pressure plate moves downward relative to the second lower pressure plate, the contact bevel block first pushes the horizontal displacement rod to rotate, and then the toggle block pushes the contact end downward.

[0013] Furthermore, the triggering assembly also includes a support plate, a support column, and a return spring. The support plate is fixed to the side of the mounting plate and located above the second lower pressure plate. A contact switch is provided on the lower surface of the support plate. The support column is vertically fixed to the top of the contact inclined block. The return spring is sleeved on the support column and connected between the bottom surface of the support plate and the upper surface of the contact inclined block. A pressure sensor is embedded in the bottom surface of the toggle block. The pressure sensor is used to contact the contact end. The contact switch is used to trigger a stop air extraction signal when the support plate contacts the second lower pressure plate. The pressure sensor is used to trigger a stop grease injection signal when it senses an increase in the pressure value transmitted by the grease squeeze on the sealing ring plate.

[0014] Furthermore, the grease injection head body is connected to the oil supply pipe of the grease supply assembly via a right-angle tube, which is connected to the top of the sealing end cap and communicates with the grease injection head body.

[0015] Furthermore, this includes the following steps: Step S, Positioning: Move the grease injection head body down with the lifting assembly and place it into the bearing, using the positioning groove to fit and position it against the bearing roller; Step S, relative displacement: The lifting cylinder continues to move downwards, the grease injection head body is blocked after being stuck in the bearing, the second spring is compressed, and the first lower pressure plate continues to move downwards relative to the second lower pressure plate; Step S, triggering air extraction: During the downward movement, the contact wedge of the triggering component pushes the horizontal displacement rod to move along the horizontal waist groove, causing the annular air tube to rotate until the horizontal displacement rod is engaged in the groove. At this time, the vent hole and the air extraction nozzle are connected to each other to extract air from the inside of the bearing. Step S, Sealing: As it continues to move downward, the return spring is compressed, the actuating block contacts and pushes the contact end of the vertical displacement rod, causing the sealing ring plate to move downward until the sealing ring plate seals at the small diameter end of the tapered groove and covers the upper end face of the bearing; Step S, Grease Injection: When the sealing ring plate is in place, the support plate contacts the second lower pressure plate to trigger the contact switch, which controls the air extraction nozzle to stop pumping air, and the grease supply assembly begins to inject grease into the grease injection head body. Step S, Stop: After the grease is filled, the sealing ring plate is squeezed, and the pressure is transmitted in the reverse direction to the pressure sensor on the toggle block. When the pressure value increases, the PLC controls the grease supply assembly to stop grease injection.

[0016] The technical solutions adopted in the embodiments of the present invention can achieve the following beneficial effects: This invention achieves rapid circumferential self-positioning of the grease injection head and the bearing by setting a positioning groove on the outer surface of the grease injection head that matches the shape of the bearing rollers, utilizing the principle of mechanical fit, without the need for a complex visual alignment system. At the same time, the oil outlet is precisely set between two adjacent positioning grooves, so that the grease injection port is directly aligned with the gap between the two cylindrical rollers. Combined with the diversion effect of the internal tapered part, it ensures that high-viscosity grease can be directly and evenly injected into the most difficult-to-fill dead corner area inside the bearing, effectively solving the problem of uneven grease distribution.

[0017] This invention utilizes the resistance difference generated during the downward movement of the lifting assembly to create relative displacement. It cleverly uses a trigger assembly to sequentially drive the venting assembly. Before grease injection, the horizontal displacement rod opens the venting channel, and then the vertical displacement rod presses down on the sealing ring plate to form a sealed cavity. This establishes a high negative pressure environment inside the bearing before the grease injection begins. This process of first evacuating and then injecting grease eliminates air resistance on the back of the rollers and in the dead corners of the cage, allowing the grease to instantly collapse and fill the tiny gaps, effectively avoiding air pockets and incomplete filling, and improving the grease injection quality of the bearing.

[0018] This invention utilizes the unidirectional continuous downward pressing action of the lifting cylinder to automatically and sequentially complete a series of process actions, including downward positioning, opening the exhaust, pressing and sealing, and triggering grease injection, through the relative displacement between the first and second pressing plates and the mechanical transmission components such as the contact wedge and the toggle block. Compared with traditional equipment that requires multiple cylinders or motors to control each action separately, the design of this invention simplifies the control program and reduces the equipment failure rate and manufacturing cost.

[0019] This invention integrates a contact switch and a pressure sensor into the triggering component. The contact switch detects the contact state between the support plate and the lower pressure plate, ensuring that air extraction and grease injection are only initiated after the sealing ring plate is fully sealed. This prevents grease leakage or air extraction failure due to misoperation. The embedded pressure sensor monitors the reverse pressure of grease on the sealing ring plate in real time, directly reflecting the degree of grease injection through changes in physical pressure. Compared with simple time control or volume control, this invention can more accurately determine the grease injection endpoint and prevent insufficient or excessive grease overflow.

[0020] The grease pump in the grease supply assembly adopts a cylinder-driven piston rod structure and is equipped with a stroke adjustment nut. By finely adjusting the effective stroke of the cylinder through mechanical limiting, the amount of grease injected in a single operation can be adjusted. This allows the system to flexibly adapt to the grease injection requirements of bearings of different specifications and models, ensuring product consistency. Attached Figure Description

[0021] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0022] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a bearing grease injection head according to the present invention; Figure 2 This is a schematic diagram of the planar structure of the bearing grease injection head of the present invention; Figure 3 This is a schematic diagram of the internal structure of the bearing grease injection head of the present invention; Figure 4 This is a top view of the bearing grease injection head of the present invention; Figure 5 This is a schematic diagram of the bearing grease injection system of the present invention; Figure 6 This is a schematic diagram of the lifting component structure of the present invention; Figure 7 For the present invention Figure 6 A magnified structural diagram at point A; Figure 8 For the present invention Figure 6 Schematic diagram of the planar structure of the lifting assembly; Figure 9 For the present invention Figure 8 A schematic diagram of the bottom structure; Figure 10 For the present invention Figure 9 A magnified structural diagram at point B; Figure 11 For the present invention Figure 9 A schematic diagram of a partial structure; Figure 12 For the present invention Figure 11 A magnified structural diagram at point C; Figure 13 For the present invention Figure 11 A schematic diagram of a partial structure; Figure 14 This is an enlarged structural diagram of point D in the present invention 13; Figure 15 For the present invention Figure 13 A schematic diagram of a partial structure; Figure 16 For the present invention Figure 15 A schematic diagram of a partial structure; Figure label: 1. Grease injection head body; 11. Threaded interface; 12. Positioning groove; 13. Oil outlet hole; 14. Tapered part; 15. Injection hole; 16. Right-angle tube; 2. Grease supply assembly; 21. Support platform; 211. Positioning sleeve; 22. Grease reservoir; 221. Pressure rod; 23. Grease outlet pipe; 24. Valve block seat; 25. Grease injection pump; 26. Oil supply pipe; 27. Drive push rod; 28. Fixed seat; 29. ​​Grease injection cylinder; 210. Stroke adjusting nut; 3. Lifting assembly; 31. Support rod; 32. Top plate; 33. Lifting cylinder; 34. First lower pressure plate; 35. First guide rod; 36. First spring; 37. Second lower pressure plate; 38. Positioning 39. Column; 310. Second guide rod; 311. Second spring; 312. Sealing end cap; 313. Horizontal waist groove; 314. Vertical waist groove; 4. Exhaust assembly; 41. Annular box; 42. Vent hole; 44. Annular air pipe; 441. Air suction nozzle; 45. Horizontal displacement rod; 46. Sealing ring plate; 461. Arch frame; 462. Guide shaft; 463. Support spring; 464. Protruding edge; 47. Vertical displacement rod; 48. Contact end; 5. Trigger assembly; 51. Mounting plate; 52. Mounting seat; 53. Contact inclined block; 531. Snap groove; 54. Push plate; 55. Toggle block; 56. Support plate; 57. Support column; 58. Return spring. Detailed Implementation

[0023] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0024] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Example 1: Refer to Figures 1-4 As shown, this embodiment of the invention provides a bearing grease injection head. The grease injection head body 1 is a component that directly extends into the bearing to perform grease injection. The grease injection head body 1 has an overall cylindrical structure, and a threaded interface 11 is provided at the center of its top end for connecting to an external grease supply line. In order to ensure that the high viscosity grease can be evenly distributed to each grease injection point, a tapered part 14 is provided at the center of the threaded interface 11. The tapered part 14 has a cone structure with the tip pointing upwards, and its bottom surface is connected to the inner bottom surface of the threaded interface 11. When grease enters from the top, the tapered part 14 separates the grease flow and guides it to the surrounding area.

[0026] A plurality of injection holes 15 are provided circumferentially on the bottom surface of the inner wall of the threaded interface 11. These injection holes 15 extend downward and communicate with a plurality of oil outlet holes 13 provided circumferentially on the grease injection head body 1 near the bottom. The oil outlet holes 13 are the outlets from which the grease is finally injected into the bearing.

[0027] To achieve rapid and precise positioning of the grease injection head and the bearing, the outer surface of the grease injection head body 1 is provided with several positioning grooves 12 at equal intervals along the circumferential direction. The shape of these positioning grooves 12 matches the circumferential surface of the cylindrical rollers of the bearing to be greased (for example, it is a concave arc surface). When the grease injection head body 1 is inserted into the inner ring of the bearing, the positioning grooves 12 fit against the cylindrical rollers, thereby restricting the rotation of the grease injection head body 1 and achieving circumferential positioning. In particular, the position of each oil outlet hole 13 is set between two adjacent positioning grooves 12. This layout ensures that the oil outlet hole 13 is exactly aligned with the gap between the two cylindrical rollers, so that the grease can directly enter the back of the rollers and improve the filling efficiency.

[0028] Reference Figures 5-7 As shown, this embodiment of the invention also provides a bearing grease injection system, which includes the aforementioned grease injection head body 1, grease supply assembly 2, lifting assembly 3, venting assembly 4, and triggering assembly 5.

[0029] The grease supply assembly 2 is the power source of the system and is used to quantitatively deliver grease. The grease supply assembly 2 includes a support platform 21, a grease storage cylinder 22, a grease pump 25, and a grease injection cylinder 29. The grease storage cylinder 22 is fixedly installed on the support platform 21 near one side and is used to store a large capacity of lubricating grease. A pressure rod 221 extends movably inside the cylinder to assist in pressurizing and delivering the grease. The bottom of the grease storage cylinder 22 is connected to the grease pump 25 through a grease outlet pipe 23. The grease pump 25 is installed on a valve block seat 24 fixed on the support platform 21. A drive push rod 27 is movably installed at one end of the pump. The drive push rod 27 is connected to the grease injection cylinder 29 fixed on a fixed base 28. The grease injection cylinder 29 is horizontally fixed on the fixed base 28.

[0030] The reciprocating motion is controlled by a PLC, and a stroke adjustment nut 210 in the shape of a hexagonal nut is fitted on the drive push rod 27. By rotating the nut to adjust its position on the drive push rod 27, the effective stroke of the grease injection cylinder 29 pushing the drive push rod 27 can be mechanically limited, thereby realizing fine adjustment of the amount of grease injected at one time (adjustment accuracy can reach 0.5 grams). The output end of the grease injection pump 25 is connected to an oil supply pipe 26, and the end of the oil supply pipe 26 is connected to the threaded interface 11 at the top of the grease injection head body 1 through a right-angle pipe 16.

[0031] Reference Figures 7-11As shown, the lifting assembly 3 is located on one side of the grease supply assembly 2 and is used to drive the grease injection head body 1 to move vertically and provide the relative displacement required to trigger the venting assembly 4. The lifting assembly 3 includes several support rods 31 symmetrically arranged and fixed on the support platform 21, and a top plate 32 fixed to the top of the support rods 31. The lifting cylinder 33 is vertically fixed to the center of the top plate 32, and its output end passes downward through the top plate 32 and is horizontally connected to the first lower pressure plate 34. Two sets of first guide rods 35 are vertically fixed on the first lower pressure plate 34. The first guide rods 35 move upward through the top plate 32, and a first spring 36 is sleeved on the first guide rod 35. The two ends of the first spring 36 are respectively connected between the upper surface of the first lower pressure plate 34 and the bottom surface of the top plate 32.

[0032] A second lower pressure plate 37 is provided below the first lower pressure plate 34. A symmetrical second guide rod 39 is fixed on the second lower pressure plate 37. The second guide rod 39 moves upward through the first lower pressure plate 34. A second spring 310 is sleeved on the second guide rod 39. The two ends of the second spring 310 are respectively connected between the lower surface of the first lower pressure plate 34 and the upper surface of the second lower pressure plate 37. It should be noted that the elastic force of the second spring 310 is designed to be less than the elastic force of the first spring 36. When the lifting assembly 3 is subjected to upward resistance, the second spring 310 will be compressed before the first spring 36, so that the first lower pressure plate 34 can continue to move downward relative to the second lower pressure plate 37.

[0033] A sealing end cap 311 is fixed to the bottom surface of the second lower pressure plate 37. The bottom surface of the sealing end cap 311 protrudes from the second lower pressure plate 37 and has a downward-opening conical groove. The grease injection head body 1 is connected to the center of the bottom surface of the sealing end cap 311. A right-angle tube 16 communicating with the grease injection head body 1 is connected to the top of the sealing end cap 311. In addition, positioning posts 38 are symmetrically fixed to the bottom surface of the second lower pressure plate 37, and a positioning sleeve 211 is provided at a corresponding position on the support platform 21. The positioning posts 38 cooperate with the positioning sleeve 211 to limit the lowest mechanical position of the second lower pressure plate 37 (i.e., the grease injection head) to prevent excessive pressure damage to the bearing.

[0034] Reference Figures 11-13 and Figures 15-16As shown, the exhaust assembly 4 is disposed inside the conical groove on the bottom surface of the sealing end cap 311 and coaxially sleeved on the outside of the grease injection head body 1. The exhaust assembly 4 includes an annular box 41, an annular air pipe 44 and a horizontal displacement rod 45. A horizontal waist groove 312 is provided on the circumferential surface of the sealing end cap 311. The annular box 41 is disposed inside the bottom surface of the conical groove and is connected to the top of the inner wall of the conical groove by a torsion spring, so that it has a resetting tendency. Several vent holes 42 are equidistantly provided on the bottom surface of the annular box 41. The annular air pipe 44 is disposed inside the annular box 41 and several suction nozzles 441 are provided on the bottom surface of the annular box 41. The horizontal displacement rod 45 is fixed on the side of the annular air pipe 44 and passes outward through the horizontal waist groove 312 on the annular box 41 and the sealing end cap 311 in sequence. In the initial state, the suction nozzle 441 and the vent 42 are misaligned (not connected). When the horizontal displacement rod 45 is subjected to force and drives the annular air tube 44 to rotate at a specific angle, the suction nozzle 441 and the vent 42 are connected, and the suction channel is opened.

[0035] The exhaust assembly 4 also includes a sealing ring plate 46, an arched frame 461, a guide shaft 462, a support spring 463, and a vertical displacement rod 47. A vertical waist groove 313 is also provided on the circumferential surface of the sealing end cover 311. The sealing ring plate 46 is disposed inside the conical groove and located below the annular box 41, and is horizontally sleeved on the grease injection head body 1. A sealing ring is provided on the outer ring of the sealing ring plate 46, and its diameter is adapted to the small diameter end of the conical groove. The arched frame 461 is fixed to the top of the sealing end cover 311, and the guide shaft 462 is fixed on the sealing ring plate 46 and moves upward through the sealing end cover. 311 and arched frame 461, guide shaft 462 is fixed with a protruding edge 464, support spring 463 is sleeved on guide shaft 462, and both ends are connected to the bottom surface of protruding edge 464 and the upper surface of sealing end cover 311 respectively, to keep sealing ring plate 46 initially in a suspended position (i.e. not in contact with the bottom surface of tapered groove), vertical displacement rod 47 is fixed on the side of sealing ring plate 46 and passes through vertical waist groove 313, and its end is provided with contact end 48. Sealing ring plate 46 is used to overcome the elastic force of support spring 463 and move down when contact end 48 is pushed by external force, so as to seal at the small diameter end of tapered groove.

[0036] Reference Figure 12 and Figures 14-16 As shown, the trigger component 5 is disposed inside the lifting component 3 and is used to convert the relative displacement between the first lower pressure plate 34 and the second lower pressure plate 37 into the driving force for the exhaust component 4. The trigger component 5 includes a mounting plate 51 that is vertically fixed to the bottom surface of the first lower pressure plate 34 and moves downward through the second lower pressure plate 37, and a mounting seat 52 that is fixed to the side of the mounting plate 51 and located below the second lower pressure plate 37. The top end of the mounting seat 52 is movably embedded in the second lower pressure plate 37.

[0037] The contact inclined block 53 is slidably disposed on the end face of the mounting base 52. It has an inclined surface suitable for pushing the horizontal displacement rod 45. A latching groove 531 for engaging the horizontal displacement rod 45 is provided on the inclined surface. The top end of the contact inclined block 53 is movably embedded in the second lower pressure plate 37. A push plate 54 is fixed on the mounting base 52. The top end of the push plate 54 is embedded in the second lower pressure plate 37. A toggle block 55 is fixed on the side of the push plate 54. The toggle block 55 is used to cooperate with the contact end 48 of the vertical displacement rod 47.

[0038] In addition, to achieve signal feedback and action reset, the trigger assembly 5 also includes a support plate 56 fixed to the side of the mounting plate 51 and suspended above the second lower pressure plate 37. A contact switch (not shown in the figure) is installed on the lower surface of the support plate 56. The position of the contact switch corresponds to the upper surface of the second lower pressure plate 37 and is used to detect whether the pressing stroke is in place. A support column 57 is vertically fixed on the top of the contact wedge 53. The support column 57 passes upward through the second lower pressure plate 37 and extends to the bottom of the support plate 56. A return spring 58 is coaxially sleeved on the support column 57. The two ends of the return spring 58 are respectively connected to the bottom surface of the support plate 56 and the upper surface of the contact wedge 53 to provide buffering force and reset elasticity. In order to achieve closed-loop control of grease injection pressure, a pressure sensor (not shown in the figure) is embedded in the bottom surface of the toggle block 55. The sensing surface of the pressure sensor faces downward and is used to directly contact and sense the reverse pressure from the contact end 48.

[0039] Working Principle: The working process of the bearing grease injection system provided in this embodiment of the invention begins with the positioning and relative displacement triggering stage. First, the lifting cylinder 33 is activated to drive the first lower pressure plate 34 to move downward, and the second spring 310 drives the second lower pressure plate 37 and the bottom grease injection head body 1 to move as a whole towards the bearing. When the grease injection head body 1 is inserted into the inner ring of the bearing, the positioning groove 12 on its outer surface is tightly fitted with the circumferential surface of the cylindrical roller of the bearing, realizing the rapid circumferential positioning of the grease injection head body 1, ensuring that each oil outlet hole 13 is aligned with the gap between the two rollers. As the lifting cylinder 33 continues to drive downward, when the positioning post 38 on the bottom surface of the second lower pressure plate 37 contacts the positioning sleeve 211 on the support platform 21, the second lower pressure plate 37 stops moving downward. At this time, because the elastic force of the first spring 36 is greater than that of the second spring 310, the driving force of the lifting cylinder 33 forces the first lower pressure plate 34 to move downward. The second spring 310 continues to move downward and compress, thereby generating a vertical relative displacement between the first lower pressure plate 34 and the second lower pressure plate 37. During this process, the mounting plate 51 fixed on the first lower pressure plate 34 drives the mounting base 52 to move downward. The inclined surface of the contact inclined block 53 slidably set on the mounting base 52 gradually contacts and horizontally pushes the horizontal displacement rod 45 extending from the exhaust assembly 4. The horizontal displacement rod 45 is subjected to force and slides along the horizontal waist groove 312, causing the internal annular air pipe 44 to rotate relative to the annular box 41 until the horizontal displacement rod 45 is engaged in the latch groove 531 on the contact inclined block 53. At this time, the annular air pipe 44 rotates into place, and the bottom suction nozzle 441 is connected to the corresponding vent hole 42 on the annular box 41. The external vacuum source then evacuates the space inside the bearing and the sealing end cover 311 through the connected air passage, forming a negative pressure environment before grease injection.

[0040] As the first pressure plate 34 moves further down, although the contact block 53 remains relatively stationary due to jamming the horizontal displacement rod 45 (compressing the return spring 58 at its top), the push plate 54 fixed on the mounting base 52 and its side actuating block 55 continue to follow the first pressure plate 34 downward. The pressure sensor on the bottom of the actuating block 55 contacts and vertically presses down the contact end 48 of the vertical displacement rod 47, overcoming the resistance of the support spring 463, and driving the sealing ring plate 46 to move down in the conical groove. When the sealing ring plate 46 moves down to the small diameter end of the conical groove and is tightly pressed against the upper end face of the bearing, a closed grease injection cavity is formed. Combined with the previous evacuation action, the bearing interior... When the part is in a high vacuum state, the support plate 56 on the side of the mounting plate 51 just moves down to contact the upper surface of the second lower pressure plate 37, triggering the contact switch on the lower surface of the support plate 56. The contact switch sends a signal to control the vacuum system to stop pumping air and instruct the grease supply assembly 2 to start. The grease injection cylinder 29 pushes the drive push rod 27 of the grease injection pump 25 to press a certain amount of lubricating grease into the grease injection head body 1 through the oil supply pipe 26 and the right angle pipe 16. After the grease is diverted by the internal conical part 14, it is injected into the roller clearance of the bearing and the dead corner of the cage from each oil outlet hole 13. Since the inside of the bearing has been emptied in advance, the grease can quickly and without air bubbles fill all the tiny gaps.

[0041] As grease is continuously injected, the internal space of the bearing is gradually filled. Once the grease is full, excess grease cannot continue to enter and instead generates upward fluid pressure, squeezing the sealing ring plate 46 covering the bearing. The upward reaction force on the sealing ring plate 46 is transmitted in the reverse direction through the guide shaft 462, the vertical displacement rod 47 and its contact end 48 to the bottom surface of the actuating block 55 pressing on the contact end 48. When the pressure sensor embedded in the bottom surface of the actuating block 55 senses the sudden increase in the reverse pressure value and exceeds the preset threshold, it is determined that the grease injection is complete and the filling is full. The PLC system immediately controls the grease injection cylinder 29 to stop its operation, ending the grease injection process. Subsequently, the lifting cylinder 33 moves in the reverse direction, driving the first lower pressure plate 34 to move upward. Each spring (first spring 36, second spring 310, reset spring 58, support spring 463) releases its elastic potential energy, driving the trigger assembly 5, the exhaust assembly 4 and the lifting assembly 3 to reset in sequence. The grease injection head body 1 is disengaged from the bearing, and the system returns to its initial state, waiting for the grease injection operation of the next bearing.

[0042] Example 2: This example provides a grease injection method based on the bearing grease injection system described in Example 1. This method utilizes the stroke difference during the mechanical pressing process to automatically and systematically complete the opening of the venting channel, the construction of the sealing cavity, and the quantitative grease injection. Specifically, it includes the following steps: Step S1: Positioning and Preparation The lifting cylinder 33 of the lifting assembly 3 is activated, driving the first lower pressure plate 34 to move vertically downward. At this time, since the stiffness coefficient of the first spring 36 is designed to be greater than that of the second spring 310, the first lower pressure plate 34 pushes the second lower pressure plate 37 to move downward synchronously through the second spring 310 and the second guide rod 39.

[0043] As the second lower pressure plate 37 moves downward, the grease injection head body 1, fixed at its bottom, is inserted into the inner ring of the bearing to be greased. At this time, the positioning groove 12 on the outer surface of the grease injection head body 1 fits against the circumferential surface of the bearing cylindrical roller, thereby restricting the circumferential rotation of the grease injection head body 1, achieving rapid and accurate positioning, and ensuring that each oil outlet hole 13 at the bottom of the grease injection head body 1 is precisely aligned with the gap between two adjacent cylindrical rollers.

[0044] Step S2: Generate relative displacement The lifting cylinder 33 continues to drive downward. When the positioning post 38 on the bottom surface of the second lower pressure plate 37 contacts the positioning sleeve 211 on the support platform 21 (or when the grease injection head body 1 is completely stuck in the bearing and cannot continue to move downward), the vertical displacement of the second lower pressure plate 37 is blocked and stops.

[0045] At this time, the pressure output by the lifting cylinder 33 overcomes the elastic force of the second spring 310, causing the first lower pressure plate 34 to continue to move downward relative to the stationary second lower pressure plate 37, thereby generating a vertical relative displacement difference between the first lower pressure plate 34 and the second lower pressure plate 37.

[0046] Step S3: Mechanically trigger exhaust As the first lower pressure plate 34 continues to move downward, the trigger assembly 5, which is fixed on the mounting plate 51 on the bottom surface of the first lower pressure plate 34, also descends. The contact ramp 53, which is slidably mounted on the mounting base 52, first contacts the horizontal displacement rod 45 extending from the exhaust assembly 4. The inclined surface of the contact ramp 53 pushes the horizontal displacement rod 45 to slide laterally along the horizontal groove 312 on the sealing end cover 311.

[0047] The lateral movement of the horizontal displacement rod 45 causes the internal annular air tube 44 to rotate relative to the annular box 41. When the horizontal displacement rod 45 slides into the groove 531 on the contact inclined block 53, the annular air tube 44 rotates into place. At this time, the suction nozzle 441 at its bottom is connected to the vent hole 42 on the bottom surface of the annular box 41. The external vacuum equipment starts to forcefully evacuate the conical groove space in the sealing end cover 311 and the internal clearance of the bearing through the connected air passage to establish a negative pressure environment before grease injection.

[0048] Step S4: Press down to seal Simultaneously with (or immediately following) the suction action, the first pressure plate 34 continues to move downward. The push plate 54 fixed on the mounting base 52 and its side actuating block 55 move downward accordingly. The bottom surface of the actuating block 55 contacts and vertically presses down on the contact end 48 of the vertical displacement rod 47. This downward pressure overcomes the resistance of the support spring 463 and drives the sealing ring plate 46 to move vertically downward in the conical groove through the guide shaft 462.

[0049] The sealing ring on the bottom surface of the sealing ring plate 46 is tightly pressed against the upper end face of the bearing and the small diameter end of the tapered groove, thereby sealing the inside of the bearing and the grease injection area into an independent high vacuum cavity to prevent external air from flowing back.

[0050] Step S5: Signal Feedback and Lipid Injection Start When the sealing ring plate 46 is in place, the support plate 56 on the side of the mounting plate 51 moves down and contacts the upper surface of the second lower pressure plate 37, triggering the contact switch (such as a micro switch or limit switch) set on the lower surface of the support plate 56. The contact switch transmits the signal to the PLC control system, and the PLC system controls the vacuum valve to close (stop pumping air) and simultaneously controls the grease supply assembly 2 to start.

[0051] The grease injection cylinder 29 pushes the drive rod 27 of the grease injection pump 25 to inject a measured amount of grease into the threaded interface 11 of the grease injection head body 1 through the oil supply pipe 26 and the right-angle pipe 16. After being diverted by the internal tapered part 14, the grease is injected from each oil outlet 13 into the bearing roller clearance and cage dead corners which are already under negative pressure, achieving rapid filling without air bubbles.

[0052] Step S6: Pressure sensing stops As grease is continuously injected, the internal space of the bearing is gradually filled. Once the grease is full, the excess grease cannot be contained and instead generates upward fluid pressure, squeezing the sealing ring plate 46 covering the bearing. The upward reaction force on the sealing ring plate 46 is transmitted in the opposite direction through the guide shaft 462, the vertical displacement rod 47 and its contact end 48 to the bottom surface of the actuating block 55 pressing on the contact end 48.

[0053] A pressure sensor embedded in the bottom surface of the toggle block 55 monitors the reverse pressure in real time. When the sensed pressure value suddenly increases and exceeds the preset grease injection completion threshold, the PLC system determines that the grease injection is complete and the filling is full, and immediately controls the grease injection cylinder 29 to stop operating, ending the grease injection process.

[0054] Step S7: Reset After grease injection is completed, the lifting cylinder 33 reverses its movement, causing the first lower pressure plate 34 to move upward. Under the elastic restoring force of the first spring 36, the second spring 310, the return spring 58, and the support spring 463, each component resets in sequence. The toggle block 55 moves upward, the sealing ring plate 46 floats up and resets under the action of the support spring 463, the contact inclined block 53 moves upward, the horizontal displacement rod 45 disengages from the retaining groove 531 and resets under the action of the torsion spring, closing the exhaust passage. The second lower pressure plate 37 is lifted, the grease injection head body 1 disengages from the bearing, and the system returns to its initial state, ready to perform grease injection on the next bearing.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A bearing grease injection head, characterized in that, Including the grease injection head body (1); The top center of the grease injection head body (1) is provided with a threaded interface (11), and the inner center of the threaded interface (11) is provided with a tapered part (14), which is used to divert the incoming grease. The inner wall bottom surface of the threaded interface (11) is provided with a plurality of injection holes (15) along the circumferential direction, and the grease injection head body (1) is provided with a plurality of oil outlet holes (13) along the circumferential direction near the bottom position, and the oil outlet holes (13) are connected to the injection holes (15). The outer surface of the grease injection head body (1) is provided with a plurality of positioning grooves (12) at equal intervals along the circumferential direction. The positioning grooves (12) are used to fit and position with the circumferential surface of the cylindrical roller of the bearing to be greased. Each oil outlet hole (13) is located between two adjacent positioning grooves (12) to align the gap between the two cylindrical rollers.

2. A bearing grease injection system, characterized in that, The device includes the grease injection head body (1) and the grease supply assembly (2) as described in claim 1. The grease supply assembly (2) includes a support platform (21), a grease reservoir (22), a grease pump (25), and a grease injection cylinder (29). The grease reservoir (22) is fixedly mounted on the support platform (21). A pressure rod (221) extends movably into the grease reservoir (22). The bottom of the grease reservoir (22) is connected to the grease pump (25) through a grease outlet pipe (23). The grease pump (25) is mounted on the support platform (21). On the valve block seat (24), a drive push rod (27) is movably provided at one end of the grease pump (25). The drive push rod (27) is connected to the grease cylinder (29) fixed on the fixed seat (28). A stroke adjustment nut (210) in the shape of a hexagonal nut is sleeved on the drive push rod (27) to adjust the effective stroke of the grease cylinder (29) pushing the drive push rod (27). The output end of the grease pump (25) is connected to an oil delivery pipe (26). The end of the oil delivery pipe (26) is connected to the grease head body (1).

3. The bearing grease injection system according to claim 2, characterized in that, It also includes a lifting assembly (3), an exhaust assembly (4) and a trigger assembly (5). The lifting assembly (3) is located on one side of the grease supply assembly (2). The grease injection head body (1) is connected to the bottom end of the lifting assembly (3). The exhaust assembly (4) is located inside the bottom end of the lifting assembly (3) and sleeved on the outside of the grease injection head body (1). The trigger assembly (5) is located on the lifting assembly (3) and cooperates with the exhaust assembly (4). The lifting assembly (3) is used to drive the grease injection head body (1) and the trigger assembly (5) to move downward. The relative displacement is generated by the resistance difference during the downward movement, and then the exhaust assembly (4) is driven to move by the trigger assembly (5).

4. A bearing grease injection system according to claim 3, characterized in that, The lifting assembly (3) includes a support rod (31), a top plate (32), a lifting cylinder (33), a first lower pressure plate (34), a first guide rod (35), a first spring (36), a second lower pressure plate (37), a positioning column (38), a second guide rod (39), a second spring (310), and a sealing end cap (311). The top plate (32) is fixed at the top of several support rods (31). The lifting cylinder (33) is vertically fixed at the center of the top plate (32). The first lower pressure plate (34) is horizontally connected to the output end of the lifting cylinder (33) and located below the top plate (32). The first guide rod (35) is vertically fixed on the first lower pressure plate (34) and moves upward through the top plate (32). The first spring (36) is sleeved on the first guide rod (35) and connected between the upper surface of the first lower pressure plate (34) and the bottom surface of the top plate (32). The second lower pressure plate (37) is located below the first lower pressure plate (34). The second guide rod (39) is fixed on the second lower pressure plate (37) and moves upward through the first lower pressure plate (34). The second spring (310) is sleeved on the second guide rod (39) and connected between the lower surface of the first lower pressure plate (34) and the upper surface of the second lower pressure plate (37). The sealing end cap (311) is fixed on the bottom surface of the second lower pressure plate (37), and its bottom surface has a downward-opening conical groove at the center. The grease injection head... The main body (1) is connected to the center of the bottom surface of the sealing end cap (311). The positioning column (38) is symmetrically fixed to the bottom surface of the second pressure plate (37). The support platform (21) is provided with a positioning sleeve (211) that cooperates with the positioning column (38) to limit the lowest position of the positioning column (38) to move down. The elastic force of the second spring (310) is less than that of the first spring (36). When the lifting cylinder (33) is pressed down, the second spring (310) is compressed before the first spring (36).

5. A bearing grease injection system according to claim 4, characterized in that, The exhaust assembly (4) includes an annular box (41), an annular air pipe (44), and a horizontal displacement rod (45). A horizontal groove (312) is provided on the circumferential surface of the sealing end cap (311). The annular box (41) is disposed on the bottom surface of the conical groove of the bottom surface of the sealing end cap (311) and is coaxially sleeved on the grease injection head body (1). The annular box (41) is connected to the top of the inner wall of the conical groove by a torsion spring. A number of vent holes (42) are provided equidistantly on the bottom surface of the annular box (41). The annular air pipe (44) is disposed on the annular box (41). Inside the annular box (41), several suction nozzles (441) are arranged circumferentially on the bottom surface of the annular air pipe (44). The horizontal displacement rod (45) is fixed to the side of the annular air pipe (44) and passes through the horizontal waist groove (312) opened on the annular box (41) and the sealing end cap (311) in sequence. In the initial state, the suction nozzle (441) does not correspond to the vent hole (42). The horizontal displacement rod (45) is used to drive the annular air pipe (44) to rotate under force until the suction nozzle (441) and the vent hole (42) are connected.

6. A bearing grease injection system according to claim 5, characterized in that, The exhaust assembly (4) also includes a sealing ring plate (46), an arched frame (461), a guide shaft (462), a support spring (463), and a vertical displacement rod (47). A vertical waist groove (313) is also provided on the circumferential surface of the sealing end cover (311). The sealing ring plate (46) is located inside the conical groove and below the annular box (41), and is horizontally sleeved on the grease injection head body (1). A sealing ring is provided on the outer ring of the sealing ring plate (46), and its diameter is adapted to the small diameter end of the conical groove. The arched frame (461) is fixed on the top of the sealing end cover (311), and the guide shaft (462) is fixed on the sealing ring plate (46). The sealing end cap (311) and the arched frame (461) move upward sequentially. A protruding edge (464) is fixed on the guide shaft (462). The support spring (463) is sleeved on the guide shaft (462) and its two ends are respectively connected to the bottom surface of the protruding edge (464) and the upper surface of the sealing end cap (311) to keep the sealing ring plate (46) initially in a suspended position. The vertical displacement rod (47) is fixed on the side of the sealing ring plate (46) and passes through the vertical waist groove (313). Its end is provided with a contact end (48). The sealing ring plate (46) is used to move downward when the contact end (48) is pushed by an external force to seal at the small diameter end of the conical groove.

7. A bearing grease injection system according to claim 6, characterized in that, The triggering component (5) includes a mounting plate (51), a mounting base (52), a contact wedge (53), and a push plate (54). The mounting plate (51) is vertically fixed to the bottom surface of the first lower pressure plate (34) and moves downward through the second lower pressure plate (37). The mounting base (52) is fixed to the side of the mounting plate (51) and located below the second lower pressure plate (37), with its top end movably embedded in the second lower pressure plate (37). The contact wedge (53) is slidably disposed on the end face of the mounting base (52) and has a design suitable for pushing a horizontal displacement rod (45). The inclined surface has a groove (531) for engaging the horizontal displacement rod (45). The push plate (54) is fixed on the mounting base (52). The push plate (54) has a toggle block (55) fixed on its side. The toggle block (55) is used to cooperate with the contact end (48) of the vertical displacement rod (47). When the first pressure plate (34) moves down relative to the second pressure plate (37), the contact inclined block (53) first pushes the horizontal displacement rod (45) to rotate, and then the toggle block (55) pushes the contact end (48) to move down.

8. A bearing grease injection system according to claim 7, characterized in that, The triggering component (5) also includes a support plate (56), a support column (57), and a reset spring (58). The support plate (56) is fixed to the side of the mounting plate (51) and located above the second lower pressure plate (37). A contact switch is provided on the lower surface of the support plate (56). The support column (57) is vertically fixed to the top of the contact inclined block (53). The reset spring (58) is sleeved on the support column (57) and connected between the bottom surface of the support plate (56) and the upper surface of the contact inclined block (53). A pressure sensor is embedded in the bottom surface of the toggle block (55). The pressure sensor is used to contact the contact end (48). The contact switch is used to trigger a stop air extraction signal when the support plate (56) contacts the second lower pressure plate (37). The pressure sensor is used to trigger a stop grease injection signal when it senses an increase in the pressure value transmitted by the grease squeeze on the sealing ring plate (46).

9. A bearing grease injection system according to claim 4, characterized in that, The grease injection head body (1) is connected to the oil supply pipe (26) of the grease supply assembly (2) through a right-angle tube (16). The right-angle tube (16) is connected to the top of the sealing end cap (311) and communicates with the grease injection head body (1).

10. A method for grease injection into a bearing grease injection system as described in any one of claims 3-9, characterized in that, Includes the following steps: Step S1, Positioning: Move the grease injection head body (1) down with the lifting assembly (3) and place it into the bearing, using the positioning groove (12) to fit and position it against the bearing roller; Step S2, relative displacement: The lifting cylinder (33) continues to move downward, the grease injection head body (1) is blocked after being inserted into the bearing, the second spring (310) is compressed, and the first lower pressure plate (34) continues to move downward relative to the second lower pressure plate (37); Step S3, triggering air extraction: During the downward movement, the contact block (53) of the trigger component (5) pushes the horizontal displacement rod (45) to move along the horizontal waist groove (312), causing the annular air pipe (44) to rotate until the horizontal displacement rod (45) is engaged in the groove (531). At this time, the vent hole (42) is connected to the air extraction nozzle (441) to extract air from the inside of the bearing. Step S4, sealing: As it continues to move downward, the return spring (58) is compressed, the toggle block (55) contacts and pushes the contact end (48) of the vertical displacement rod (47), causing the sealing ring plate (46) to move downward until the sealing ring plate (46) seals at the small diameter end of the tapered groove and covers the upper end face of the bearing; Step S5, Grease Injection: When the sealing ring plate (46) is sealed in place, the support plate (56) contacts the second lower pressure plate (37) to trigger the contact switch, control the air extraction nozzle (441) to stop air extraction, and the grease supply assembly (2) begins to inject grease into the grease injection head body (1). Step S6, Stop: After the grease is filled, the sealing ring plate (46) is squeezed, and the pressure is transmitted in the reverse direction to the pressure sensor on the toggle block (55). When the pressure value increases, the PLC controls the grease supply assembly (2) to stop grease injection.

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