Coaxial gearbox transmission rod assembly for lifting table legs

Abstract

The invention discloses a coaxial gear box transmission rod assembly for lifting table legs, and belongs to the technical field of transmission assemblys.The coaxial gear box transmission rod assembly comprises a gear box, an input rod and an output rod, the input rod and the output rod both extend to the inner side of the gear box and are both rotationally connected with the gear box, and the side, extending to the gear box, of the input rod is connected with a driving bevel gear; the side, extending to the gear box, of the output rod is connected with a gear disc, a driven bevel tooth part is arranged on the periphery of the gear disc, an oil supply wheel disc is arranged on the side, located on the driving bevel gear, of the input rod, an annular oil cavity is formed in the oil supply wheel disc, and a plurality of oil outlet pipes are arranged on the side, facing the driving bevel gear, of the oil supply wheel disc in a surrounding mode. A plurality of elastic pressing air bags are arranged on the peripheral face of the oil supply wheel disc and communicate with a pressurizing pipe. Lubricating oil can be automatically supplied when the gear in the gear box works, it is ensured that the gear is lubricated in time, and the transmission rod assembly can transmit power and torque more effectively.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gear box drive rod assembly, and particularly relates to a coaxial gear box drive rod assembly for a lifting table leg. BACKGROUND

[0002] The lifting table can meet the health office needs of personnel of different heights to realize standing and sitting alternately, and the lifting device of the prior art lifting table generally comprises a driving mechanism, an input rod, two gear boxes and two output rods, the output rod is connected with the input rod in the gear box and can rotate forward and backward under the driving of the gear, and the surface of the output rod is provided with a threaded structure, so that the inner and outer pipes of the lifting table leg are relatively displaced to lift the table leg.

[0003] A lifting device of a lifting table is disclosed in Chinese Patent No. 2018213893018, in which the two drive rods in the gear box are driven by two gears to rotate and drive the table leg to lift. Lubricating oil is usually added periodically in the gear box to reduce the friction between the gears, but the working time of the gears in the gear box for lifting the table leg is different from that in other application fields. After the height of the lifting table leg is adjusted, the height is often kept fixed for a long time until different people have different needs to adjust the height of the table leg again. Therefore, the gears in the gear box are in a non-working state for a long time, and if the lubricating oil is added periodically, it will inevitably be wasted. If the lubricating oil is not added, the original lubricating oil in the gear box is easily contaminated by dust and moisture in the environment, reducing the lubricating effect. SUMMARY

[0004] To solve the above problems, the present application provides a coaxial gear box drive rod assembly for a lifting table leg, which comprises a gear box, an input rod and an output rod, the input rod and the output rod are both extended to the inside of the gear box and are both rotationally connected with the gear box, the axial directions of the input rod and the output rod are perpendicular, the input rod is connected with a driving bevel gear on one side extended to the inside of the gear box, the output rod is connected with a gear disc on one side extended to the inside of the gear box, the peripheral part of the gear disc is provided with a driven bevel part, the driving bevel gear is engaged with the driven bevel part, the side of the input rod where the driving bevel gear is located is provided with an oil supply disc, the inside of the oil supply disc is provided with an annular oil cavity, a plurality of oil outlet pipes are arranged around the side of the oil supply disc facing the driving bevel gear, a plurality of elastic pressing air bags are arranged on the outer periphery of the oil supply disc, the elastic pressing air bags are connected with a pressurizing pipe, the pressurizing pipe is connected with the annular oil cavity and the oil outlet pipes, and the inside bottom of the gear box is provided with a pressing part below the oil supply disc.

[0005] Preferably, the pressing part comprises a pressing roller and a supporting shaft, the supporting shaft is fixed at the bottom of the inside of the gear box below the oil supply wheel, and the pressing roller is rotatably arranged on the supporting shaft.

[0006] Preferably, the pressing part comprises a fixed plate and a first magnetic plate, the fixed plate is fixed at the bottom of the inside of the gear box below the oil supply wheel, the first magnetic plate is fixed above the fixed plate, the second magnetic plate is arranged on the elastic pressing air bag, and the magnetic poles of the second magnetic plate and the first magnetic plate are the same.

[0007] Preferably, the oil supply wheel is fixedly connected with the input rod, one side of the oil supply wheel facing the driving bevel gear is provided with a groove, a plurality of first extrusion surfaces and a plurality of second extrusion surfaces are arranged on the inner side wall of the groove, the first extrusion surfaces and the second extrusion surfaces are arranged adjacently, and the angle between the first extrusion surfaces and the second extrusion surfaces ranges from 100° to 160°, the driving bevel gear is connected with a sleeving pipe in the middle, the bottom of the sleeving pipe is connected with a transmission disc, the driving bevel gear and the transmission disc are sleeved on the input rod through the sleeving pipe, the transmission disc is embedded in the groove, a plurality of extrusion plates curved in one direction are arranged on the outer circumferential surface of the transmission disc, an elastic space is formed between one side of the extrusion plates and the outer circumferential surface of the transmission disc, and extrusion protrusions are arranged on the other side of the extrusion plates.

[0008] Preferably, a baffle is arranged between the oil outlet pipe and the pressurizing pipe, one side of the baffle close to the pressurizing pipe is connected with a reset spring, the end of the reset spring is connected with a piston, a communication groove is arranged on the side edge of the baffle, the pressurizing pipe is communicated with the oil outlet pipe through the communication groove when the reset spring is contracted, and an oil supply groove hole is arranged between the annular oil cavity and the pressurizing pipe.

[0009] Preferably, the oil supply groove hole is hingedly connected with a cover plate at one end close to the pressurizing pipe, and the diameter of the cover plate is greater than that of the oil supply groove hole.

[0010] Preferably, an elastic contraction air bag is arranged in the annular oil cavity, an oil delivery hole is arranged on the inside of the annular oil cavity, and a gas pressure balance hole is arranged on the outside of the elastic contraction air bag.

[0011] Preferably, a threaded part is arranged at the bottom of the output rod, a plurality of transmission pipes are arranged in the output rod, a plurality of first transmission ports are arranged in the middle of the gear disc, the first transmission ports are connected with one end of the transmission pipes, a plurality of second transmission ports are arranged on the threaded part, and the second transmission ports are connected with the other end of the transmission pipes.

[0012] Preferably, a plurality of anti-blocking discs are arranged on the transmission pipes at intervals, the anti-blocking discs are provided with a hollow structure, and the inside of the anti-blocking discs is communicated with the transmission pipes.

[0013] Preferably, the outward end of the oil outlet pipe is connected with a spray head, and the spray head is provided with a plurality of inclined spray holes.

[0014] The advantages of the present application are: 1. The present application can realize automatic lubricating oil addition on demand, and the lubricating oil is sprayed to the gear contact surface from the oil outlet pipe only when the gear in the gear box starts to work by pressing the elastic air bag to pressurize. When the gear is in a non-working state, the lubricating oil will not be wasted. Moreover, the annular oil cavity and the oil outlet pipe are relatively closed, reducing the direct contact of the lubricating oil with the external environment, thereby reducing the risk of dust and moisture pollution and prolonging the service life of the lubricating oil.

[0015] 2. In the present application, through the delayed rotation of the driving bevel gear, the lubricating oil in the oil supply wheel can be uniformly sprayed on the contact surface before the driving bevel gear and the driven bevel gear rotate, which can significantly improve the lubricating effect of the gear, reduce friction and wear, and prolong the service life of the gear.

[0016] 3. In the present application, through the combination design of the baffle, the return spring and the piston, the effective sealing between the pressurizing pipe and the oil outlet pipe is ensured when no pressure is added, preventing the lubricating oil from leaking. At the same time, it can directly prevent the direct contact of the lubricating oil with the external environment, avoiding the possibility of lubricating oil pollution.

[0017] 4. In the present application, through the gear wheel and the transmission pipe, it is ensured that the lubricating oil can cover the contact surface of the gear and the surface of the threaded part at the same time, realizing the comprehensive lubrication of the key friction parts, which helps to reduce friction and wear, improve the operation efficiency and service life of the equipment.

[0018] 5. In the present application, the anti-blocking disc is arranged on the transmission pipe at intervals, thereby reducing the risk of local lubrication deficiency caused by blockage to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole structure diagram of the present application.

[0020] Figure 2 It is an internal structure diagram of the gear box of the present application.

[0021] Figure 3 It is a cross-sectional structure diagram of the oil supply wheel of the present application.

[0022] Figure 4 It is a structure diagram of the oil supply wheel and the transmission disc of the present application.

[0023] Figure 5 It is a side view structure diagram of the oil supply wheel and the transmission disc of the present application after being nested.

[0024] Figure 6Figure 3 is a structure diagram of the pressing part in the embodiment 3 of the present application.

[0025] Figure 7 Figure 4 is a sectional structure diagram of the annular oil cavity part below the oil supply wheel in the present application.

[0026] Figure 8 Figure 5 is a diagram of the oil supply state of the annular oil cavity part below the oil supply wheel in the present application.

[0027] Figure 9 Figure 6 is a structure diagram of the annular oil cavity part provided with an elastic shrinkage air bag in the present application.

[0028] Figure 10 Figure 7 is a structure diagram of the output rod in the present application.

[0029] Figure 11 Figure 8 is a structure diagram of the gear wheel in the present application.

[0030] Figure 12 Figure 9 is a structure diagram of the transmission pipe and the anti-blocking disc.

[0031] Figure 13 Figure 10 is a structure diagram of the nozzle in the present application.

[0032] Figure 14 Figure 11 is a sectional structure diagram of the nozzle in the present application.

[0033] Figure 1 is a gear box, Figure 2 is an input rod, Figure 3 is an output rod, Figure 4 is a driving bevel gear, Figure 5 is a gear wheel, Figure 6 is a driven bevel gear part, Figure 7 is an oil supply wheel, Figure 8 is an annular oil cavity, Figure 9 is an oil outlet pipe, Figure 10 is an elastic pressing air bag, Figure 11 is a pressing pipe, Figure 12 is a pressing roller, Figure 13 is a supporting shaft, Figure 14 is a fixed plate, Figure 15 is a first magnetic plate, Figure 16 is a second magnetic plate, Figure 17 is a recess, Figure 18 is a first extrusion surface, Figure 19 is a second extrusion surface, Figure 20 is a sleeved pipe, Figure 21 is a transmission disc, Figure 22 is an extrusion plate, Figure 23 is an elastic space, Figure 24 is an extrusion protrusion, Figure 25 is a baffle, Figure 26 is a return spring, Figure 27 is a piston, Figure 28 is a communication groove, Figure 29 is an oil supply groove hole, Figure 30 is a cover plate, Figure 31 is an elastic shrinkage air bag, Figure 32 is an oil outlet hole, Figure 33 is a gas pressure balance hole, Figure 34 is a threaded part, Figure 35 is a transmission pipe, Figure 36 is a first transmission port, Figure 37 is a second transmission port, Figure 38 is an anti-blocking disc, Figure 39 is a nozzle, and Figure 40 is a spray hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0035] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped with" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In summary, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Example 1, as Figure 1 As shown, a coaxial gearbox transmission rod assembly for raising and lowering table legs includes a gearbox 1, an input rod 2, and an output rod 3. A drive motor is connected to the middle portion of the input rod 2, which drives the input rod 2 to rotate. Typically, a gearbox 1 and an output rod 3 are provided on each side of the input rod 2 to achieve simultaneous raising and lowering of the table legs on both sides. Since the structures of the gearbox 1 and output rod 3 on both sides are identical, this embodiment only shows the gearbox 1 and output rod 3 on one side.

[0038] Combination Figure 2 In this embodiment, one side of the input rod 2 extends into the inner side of the gearbox 1 and is rotatably connected to the gearbox 1. The top of the output rod 3 extends into the inner side of the gearbox 1 and is also rotatably connected to the gearbox 1. The axial directions of the input rod 2 and the output rod 3 are perpendicular. The side of the input rod 2 extending into the gearbox 1 is connected to the driving bevel gear 4, and the side of the output rod 3 extending into the gearbox 1 is connected to the gear disk 5. The periphery of the gear disk 5 is provided with a driven bevel gear 6, and the driving bevel gear 4 meshes with the driven bevel gear 6. When the drive motor drives the input rod 2 to rotate, the input rod 2 drives the output rod 3 to rotate through the driving bevel gear 4. The lower outer surface of the output rod 3 is provided with a threaded part 34, thereby causing the inner and outer tubes of the lifting table leg to move relative to each other, thus raising and lowering the table leg.

[0039] In combination Figures 2-3 , the input rod 2 is provided with an oil supply disc 7 on the side of the driving bevel gear 4, the inside of the oil supply disc 7 is provided with an annular oil cavity 8 filled with lubricating oil, the oil supply disc 7 rotates with the rotation of the input rod 2. The oil supply disc 7 is provided with a plurality of oil outlet pipes 9 around the side facing the driving bevel gear 4, the outer circumferential surface of the oil supply disc 7 is provided with a plurality of elastic pressing air bags 10, each of the elastic pressing air bags 10 is correspondingly connected with a pressurizing pipe 11, the pressurizing pipe 11 is connected with the annular oil cavity 8 and the corresponding oil outlet pipe 9. When the elastic pressing air bag 10 is pressed, the corresponding pressurizing pipe 11 will pressurize the annular oil cavity 8, under the action of the air pressure, the lubricating oil in the annular oil cavity 8 is sprayed from the oil outlet pipe 9, thereby entering the meshing part of the driving bevel gear 4 and the driven bevel gear part 6. By accurately spraying the lubricating oil on the gear contact surface, it is ensured that even if the gear has not worked for a long time, an effective oil film can be quickly formed when it is restarted, thereby reducing friction and wear. This not only avoids periodic addition of lubricating oil, but also improves the lubricating efficiency and ensures the long-term stable operation of the gear box 1 and the input rod 2 and the output rod 3.

[0040] The inside bottom of the gear box 1 is provided with a pressing part below the oil supply disc 7, after the pressing part is pressed, the lubricating oil can quickly enter the meshing part between the driving bevel gear 4 and the driven bevel gear part 6 from the oil outlet pipe 9 of the oil supply disc 7. The oil supply disc 7 and the driving bevel gear 4 rotate with the rotation of the input rod 2, while the oil supply disc 7 rotates, the elastic pressing air bags 10 on the outer circumferential surface of the oil supply disc 7 are pressed in turn by the pressing part below, thereby making the lubricating oil in the annular oil cavity 8 continuously sprayed from the oil outlet pipe 9 to the meshing part of the driving bevel gear 4 and the driven bevel gear part 6. The elastic pressing air bag 10 is preferably made of thermoplastic polyurethane, which can withstand a large deformation and quickly recover to its original state after the external force disappears, and is very suitable for making elastic air bags that need to be pressed frequently and reset. At the same time, thermoplastic polyurethane also has good weather resistance and chemical corrosion resistance, can maintain stable performance in various environmental conditions, and can further improve the pressing life. In addition to thermoplastic polyurethane, silica gel, rubber and elastomer materials can also be used to make the elastic pressing air bag 10. In order to ensure the stability of the reset of the elastic pressing air bag 10, a spring can be added inside the elastic pressing air bag 10 to ensure that the elastic pressing air bag 10 is quickly reset after being pressed and deformed. Figure 6

[0041] In combination Figure 3 ​The pressing part in the embodiment comprises a pressing roller 12 and a supporting shaft 13. The supporting shaft 13 is fixed at the bottom of the inside of the gear box 1 below the oil supply wheel 7. The pressing roller 12 is rotatably arranged on the supporting shaft 13. When the oil supply wheel 7 rotates, the elastic pressing air bag 10 on the outer circumferential surface of the oil supply wheel 7 passes through the pressing roller 12 in sequence and is extruded by the pressing roller 12. The supporting shaft 13 is fixed at the bottom of the gear box 1 to provide stable support for the pressing roller 12. This design makes the pressing roller 12 not easy to deviate or shake during rotation, thereby ensuring stable contact and effective extrusion with the elastic pressing air bag 10. Since the pressing roller 12 and the elastic pressing air bag 10 are in a rolling friction structure, the friction between them is small, which not only reduces the wear of the elastic pressing air bag 10, but also enables the pressing roller 12 to extrude the elastic pressing air bag 10 more effectively due to the smoothness of rolling friction, thereby ensuring that the lubricating oil can be smoothly sprayed from the oil outlet pipe 9.

[0042] In combination Figures 4-5 In the embodiment, the oil supply wheel 7 is fixedly connected with the input rod 2. The oil supply wheel 7 is provided with a groove 17 on the side facing the driving bevel gear 4. The inner side wall of the groove 17 is provided with a plurality of first extrusion surfaces 18 and a plurality of second extrusion surfaces 19. The first extrusion surfaces 18 and the second extrusion surfaces 19 are arranged adjacent to each other, and the angle between the first extrusion surfaces 18 and the second extrusion surfaces 19 ranges from 100° to 160°, and is 120° in the embodiment.

[0043] The driving bevel gear 4 is connected with a sleeving pipe 20. The bottom of the sleeving pipe 20 is connected with a transmission disc 21. The driving bevel gear 4 and the transmission disc 21 are sleeved on the input rod 2 through the sleeving pipe 20. The transmission disc 21 is embedded in the groove 17. The outer circumferential surface of the transmission disc 21 is provided with a plurality of extrusion plates 22 curved in one direction. An elastic space 23 is formed between one side of the extrusion plate 22 and the outer circumferential surface of the transmission disc 21. The other side of the extrusion plate 22 is provided with an extrusion protrusion 24. Figure 5As shown, the extrusion protrusion 24 is located between the included angle of the first extrusion surface 18 and the second extrusion surface 19. When the input rod 2 rotates, since the oil supply disc 7 is fixedly connected with the input rod 2, the oil supply disc 7 will immediately rotate with the input rod 2, but the driving bevel gear 4 and the transmission disc 21 are sleeved on the input rod 2 through the sleeve pipe 20, so the driving bevel gear 4 and the transmission disc 21 are not directly driven by the input rod 2. The input rod 2 will first drive the oil supply disc 7 to rotate, taking the clockwise rotation direction as an example, when the oil supply disc 7 rotates clockwise, the first extrusion surface 18 will also move clockwise, the first extrusion surface 18 will give the extrusion protrusion 24 a clockwise force. At this time, since the driving bevel gear 4 is in meshing state with the driven bevel gear part 6 on the gear disc 5, a certain force is needed to rotate the gear disc 5, so in the initial stage, the driven bevel gear part 6 will actually limit the driving bevel gear 4 and the transmission disc 21 to a certain extent. When the first extrusion surface 18 initially moves clockwise, the extrusion protrusion 24 will not immediately move clockwise, but will deform the extrusion plate 22 under the extrusion of the first extrusion surface 18, the extrusion plate 22 bends towards the elastic space 23, the extrusion protrusion 24 forms a sliding phenomenon on the first extrusion surface 18. But when the extrusion plate 22 bends to the limit, the bottom of the extrusion plate 22 abuts against the outer circumferential surface of the transmission disc 21, at this time, since the extrusion plate 22 will not continue to bend, the extrusion protrusion 24 and the first extrusion surface 18 will not slide again, the first extrusion surface 18 will drive the transmission disc 21 to rotate clockwise through the extrusion protrusion 24, so as to drive the sleeve pipe 20 and the driving bevel gear 4 to rotate clockwise. Therefore, the above-mentioned components can realize the delayed rotation of the driving bevel gear 4. When the input rod 2 rotates, the oil supply disc 7 will rotate relatively in advance with respect to the driving bevel gear 4, before the driving bevel gear 4 and the driven bevel gear part 6 rotate, the oil outlet pipe 9 can spray lubricating oil in advance to the meshing part of the driving bevel gear 4 and the driven bevel gear part 6. Similarly, when the oil supply disc 7 rotates counterclockwise, the second extrusion surface 19 can realize the delayed rotation of the driving bevel gear 4 in the counterclockwise direction. After the oil supply disc 7 rotates, the lubricating oil in the annular oil chamber 8 can be sprayed in advance before the driving bevel gear 4 rotates. Through the pre-lubrication mode, the lubrication effect of the gear can be significantly improved, the friction and wear between the driving bevel gear 4 and the driven bevel gear part 6 caused by the lack of lubricating oil in the initial stage can be avoided, and the service life of the gear is prolonged. After the transmission disc 21 is embedded in the groove 17, a ring piece can be arranged on the surface of the oil supply disc 7 or the groove can be directly closed to achieve the effect of axially limiting the transmission disc 21, such as arranging the ring piece to cover the surface of the oil supply disc 7, a through hole needs to be arranged to ensure smooth spraying of the oil outlet pipe 9.

[0044] Embodiment 2, the embodiment has the same parts as embodiment 1, such as Figure 7As shown, in this embodiment, the pressure pipe 11 is coaxially arranged with the oil outlet pipe 9. The cross-section of the pressure pipe 11 is L-shaped. A baffle 25 is provided between the oil outlet pipe 9 and the pressure pipe 11. A return spring 26 is connected to the side of the baffle 25 near the pressure pipe 11. A piston 27 is connected to the end of the return spring 26. A connecting groove 28 is provided on the upper side of the baffle 25. An oil supply groove hole 29 is connected between the annular oil chamber 8 and the pressure pipe 11. The pressure pipe 11, located below the oil supply wheel 7, is pre-filled with lubricating oil when the annular oil chamber 8 is replenished. Then, the lubricating oil in the annular oil chamber 8 is continuously replenished to the pressure pipe 11 below the oil supply wheel 7 under the action of gravity and centrifugal force. When the pressing part below squeezes the elastic pressing airbag 10, the lubricating oil in the pressure pipe 11 is pushed by the airflow from the elastic pressing airbag 10, impacting the piston 27 to the right, causing the return spring 26 to contract. Figure 8 As shown, when the return spring 26 contracts, the pressure pipe 11 can be connected to the oil outlet pipe 9 through the connecting groove 28, and the lubricating oil is supplied according to... Figure 8 The oil flows outward through the connecting groove 28 into the outlet pipe 9, as indicated by the middle arrow. When the elastic pressure bladder 10 is depressurized and resets, the return spring 26 and piston 27 also reset. Simultaneously, the lubricating oil in the annular oil chamber 8 flows into the pressurizing pipe 11 through the oil supply slot 29, awaiting the next pressurized injection. The combined design of the baffle 25, return spring 26, and piston 27 ensures an effective seal between the pressurizing pipe 11 and the outlet pipe 9 when not pressurized, preventing lubricating oil leakage and external contamination. During pressurization, the connecting groove 28 connects the two, ensuring smooth oil ejection.

[0045] Combination Figures 7-8 A cover plate 30 is hinged to one end of the oil supply slot 29 near the pressure pipe 11. The diameter of the cover plate 30 is larger than the diameter of the oil supply slot 29. When the pressure pipe 11 is propelled by airflow and the lubricating oil moves to the right, the cover plate 30 will seal the bottom of the oil supply slot 29 under the action of the lubricating oil flow, preventing the lubricating oil from flowing back into the annular oil chamber 8. When the elastic pressing airbag 10 is no longer pressurized and resets, the lubricating oil in the annular oil chamber 8 flows into the pressure pipe 11, and the cover plate 30 will automatically open, so as not to obstruct the flow of lubricating oil into the pressure pipe 11.

[0046] Combination Figure 9, the annular oil cavity 8 is provided with an oil outlet hole 32 inside the elastic contraction air bag 31, and the annular oil cavity 8 is provided with a gas pressure balance hole 33 on the outer side wall of the elastic contraction air bag 31. The lubricating oil is stored in the annular oil cavity 8 through the oil outlet hole 32, and as more lubricating oil is injected, the elastic contraction air bag 31 will gradually expand. The gas pressure balance hole 33 is connected between the outside and the inside of the annular oil cavity 8, and provides a gas pressure balance function, thereby facilitating the expansion and contraction of the elastic contraction air bag 31. After the lubricating oil fills the space inside the elastic contraction air bag 31 in the annular oil cavity 8, the oil outlet hole 32 is closed, and under the contraction action of the elastic contraction air bag 31, the lubricating oil in the annular oil cavity 8 is squeezed into the pressurizing pipe 11. Under the contraction action of the elastic contraction air bag 31, the lubricating oil is squeezed into the pressurizing pipe 11 at a stable speed and amount, avoiding the problem of poor lubricating oil supply, which leads to a decrease in lubrication effect. The elastic contraction air bag 31 is made of materials with good elasticity, such as silica gel, rubber, and thermoplastic polyurethane TPU. In its natural state, it has a tendency to contract inward. When the annular oil cavity 8 is injected with lubricating oil, the elastic contraction air bag 31 will be expanded under the action of oil pressure and store a certain amount of elastic potential energy. When the external oil injection action stops or the lubricating oil in the annular oil cavity 8 is sprayed out through the oil outlet pipe 9, the pressure in the annular oil cavity 8 decreases, and the elastic contraction air bag 31 automatically contracts due to its own elastic restoring force, thereby squeezing the lubricating oil in the annular oil cavity 8 into the pressurizing pipe 11, realizing continuous supply of lubricating oil.

[0047] Embodiment 3 has the same parts as Embodiment 1, combined with Figure 6 The difference between this embodiment and Embodiment 1 is that the pressing part includes a fixed plate 14 and a first magnetic plate 15. The fixed plate 14 is fixed to the bottom of the inside of the gear box 1 below the oil supply disc 7, and the first magnetic plate 15 is fixed above the fixed plate 14. A second magnetic plate 16 is provided on the elastic pressing air bag 10, and the second magnetic plate 16 has the same magnetic pole as the first magnetic plate 15. In this embodiment, when the elastic pressing air bag 10 on the outer periphery of the oil supply disc 7 passes through the pressing part, the second magnetic plate 16 on the elastic pressing air bag 10 is subjected to magnetic repulsion generated by the first magnetic plate 15 on the fixed plate 14, thereby playing a role in pressing the elastic pressing air bag 10. The elastic pressing air bag 10 does not need to be in contact with the pressing part when it is pressed, thereby avoiding wear and friction that may occur in the traditional pressing method, helping to maintain the integrity and sealing performance of the elastic pressing air bag 10, and avoiding the problem of lubricating oil leakage and the inability of the pressed elastic pressing air bag 10 to effectively push the lubricating oil to be sprayed.

[0048] Combined with Figures 10-12In the embodiment, a plurality of transmission pipes 35 are arranged inside the output rod 3, a plurality of first transmission openings 36 are arranged in the middle of the gear disc 5, the first transmission openings 36 are connected with one end of the transmission pipes 35, a plurality of second transmission openings 37 are arranged on the threaded part 34 below the output rod 3, the second transmission openings 37 are connected with the other end of the transmission pipes 35, after the oil outlet pipe 9 sprays lubricating oil, part of the lubricating oil forms an oil film on the contact surface of the gear, and the other part flows to the first transmission openings 36, then flows to the second transmission openings 37 through the corresponding transmission pipes 35, and finally flows to the surface of the threaded part 34, so as to provide lubricating effect for the surface of the threaded part 34. The scheme ensures that the lubricating oil can cover the contact surface of the gear and the surface of the threaded part 34 at the same time, realizes comprehensive lubrication of the key friction parts, helps to reduce friction and wear, improves the operation efficiency and service life of the equipment, and at the same time, through the connection of the transmission pipes 35, the first transmission openings 36 and the second transmission openings 37, the lubricating oil can continuously flow from the oil outlet pipe 9 to the gear and the threaded part 34, ensuring the persistence of the lubricating effect.

[0049] The transmission pipe 35 is provided with a plurality of anti-blocking discs 38 at intervals. The anti-blocking disc 38 is internally provided with a hollow structure, and the inside of the anti-blocking disc 38 communicates with a plurality of transmission pipes 35. When a certain transmission pipe 35 is blocked, the lubricating oil in the remaining transmission pipes 35 can re-enter the blocked transmission pipe 35 through the anti-blocking disc 38 below the blockage point of the transmission pipe 35, so that the lubricating oil can flow to the corresponding second transmission port 37 of the blocked transmission pipe 35, ensuring that the lubricating oil can continuously flow to all parts that need to be lubricated. The surface of the threaded part 34 cannot be lubricated due to blockage. In the present scheme, the inside of the anti-blocking disc 38 is provided with a hollow cavity, and a communication hole corresponding to the transmission pipe 35 is formed on the upper and lower sides thereof. Each transmission pipe 35 is divided into two sections by the anti-blocking disc 38, and the two sections are in communication with each other through the hollow cavity of the anti-blocking disc 38. In this way, when a certain transmission pipe 35 is blocked, the lubricating oil in the upper section of the remaining transmission pipes 35 can enter the hollow cavity of the anti-blocking disc 38 through the upper communication hole, part of the lubricating oil can directly enter the lower section of the corresponding transmission pipe 35 through the lower communication hole, and the other part can flow into the lower section of other transmission pipes 35 after accumulating in the hollow cavity, which includes the lower section of the blocked transmission pipe 35. Through the reasonable design of the structure, the flow distribution and compensation between the transmission pipes 35 can be realized, and the problem of poor lubrication caused by local blockage can be effectively avoided. In order to ensure that there is an anti-blocking disc 38 corresponding to any possible blockage position below, the interval distance of the anti-blocking disc 38 is limited in the present scheme, the anti-blocking discs 38 are uniformly arranged along the length direction of the transmission pipe 35, the interval between adjacent anti-blocking discs 38 is determined according to the multiple of the inner diameter D of the transmission pipe 35, and the interval is preferably 3D-6D, and the interval is set to 4D in the present embodiment. Experimental verification shows that when the interval is greater than 6D, under the condition of local blockage, the lubricating oil flow downstream of the anti-blocking disc 38 will be attenuated, and a lubrication dead zone is easily formed; and when the interval is controlled within the above range, no matter where the blockage point is located, there is an anti-blocking disc 38 below the blockage point, so that the lubricating oil can smoothly cross the blockage point and continue to be transported. In the present embodiment, when the upper section of a certain transmission pipe 35 is blocked, the lubricating oil in the upper section of the transmission pipe 35 cannot directly flow into the lower section, but the lubricating oil in the upper section of other transmission pipes 35 can still form a “transfer pool” through the hollow cavity of the anti-blocking disc 38, accumulate lubricating oil from other transmission pipes 35, and the liquid level of the lubricating oil in the hollow cavity rises to enter the lower end of the blocked transmission pipe 35. The lubricating oil flows into the lower section of the blocked transmission pipe 35 through the pressure difference provided by gravity under the action of gravity, realizing the flow of lubricating oil across the blockage point.

[0050] In combination Figures 13-14The oil outlet pipe 9 is connected with a spray head 39 at the outward end in the embodiment, and the spray head 39 is provided with a plurality of inclined spray holes 40. The spray head 39 is mushroom-shaped as a whole, and can be screwed or fixedly connected with the oil outlet pipe 9. The plurality of spray holes 40 on the spray head 39 are all inclined, so that the lubricating oil can be more evenly distributed on the surface of the contact surface between the driving bevel gear 4 and the driven bevel gear 6 when sprayed, avoiding the problem of uneven lubrication caused by the direct impact of the lubricating oil on the center of the gear plate 5. The inclined spray holes 40 enable the lubricating oil to cover the entire surface of the contact surface between the driving bevel gear 4 and the driven bevel gear 6 more quickly, improving the lubrication efficiency and ensuring that the gear can be timely lubricated during high-speed operation.

[0051] Embodiments of the application have been shown and described, and it will be apparent to those of ordinary skill in the art that many variations, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A coaxial gear box drive rod assembly for a lift table leg, characterized by: The utility model provides a gear box (1), input rod (2) and output rod (3), the input rod (2) and the output rod (3) all extend to gear box (1) inside and all are rotatoryly connected between gear box (1), the axial direction of input rod (2) and output rod (3) is perpendicular, the input rod (2) extends to the one side of gear box (1) inside and is connected with driving bevel gear (4), the output rod (3) extends to the one side of gear box (1) inside and is connected with gear disc (5), the peripheral portion of gear disc (5) is equipped with driven bevel gear (6), driving bevel gear (4) is engaged with driven bevel gear (6), the side of input rod (2) located driving bevel gear (4) is equipped with oil supply wheel disc (7), the inside of oil supply wheel disc (7) is equipped with annular oil chamber (8), oil supply wheel disc (7) is surrounded and is equipped with a plurality of oil outlet pipe (9) towards driving bevel gear (4) side, the outer periphery of oil supply wheel disc (7) is equipped with a plurality of elastic pressing air bag (10), elastic pressing air bag (10) is communicated with pressurizing pipe (11), pressurizing pipe (11) is communicated with annular oil chamber (8) and oil outlet pipe (9), the inside bottom of gear box (1) is located below oil supply wheel disc (7) and is equipped with pressing portion.

2. The in-line gear box drive rod assembly for a lift table leg of claim 1, wherein: The pressing portion includes a pressing roller (12) and a support shaft (13), the support shaft (13) is fixed at the position of the inside bottom of the gear box (1) below the oil supply wheel disc (7), and the pressing roller (12) is rotatably arranged on the support shaft (13).

3. The in-line gear box drive rod assembly for a lift table leg of claim 1, wherein: The pressing portion includes a fixed plate (14) and a first magnetic plate (15), the fixed plate (14) is fixed at the position of the inside bottom of the gear box (1) below the oil supply wheel disc (7), and the first magnetic plate (15) is fixed above the fixed plate (14), the second magnetic plate (16) is arranged on the elastic pressing air bag (10), and the second magnetic plate (16) has the same magnetic pole as the first magnetic plate (15).

4. The in-line gear box drive rod assembly for a lift table leg of claim 2 or claim 3, wherein: The oil supply wheel disc (7) is fixedly connected with the input rod (2), one side of the oil supply wheel disc (7) towards the driving bevel gear (4) is provided with a groove (17), a plurality of first extrusion surfaces (18) and a plurality of second extrusion surfaces (19) are arranged on the inner side wall of the groove (17), the first extrusion surfaces (18) and the second extrusion surfaces (19) are arranged adjacent to each other, and the angle between the first extrusion surfaces (18) and the second extrusion surfaces (19) ranges from 100° to 160°, the driving bevel gear (4) is connected with a sleeving pipe (20), the bottom of the sleeving pipe (20) is connected with a transmission disc (21), the driving bevel gear (4) and the transmission disc (21) are sleeved on the input rod (2) through the sleeving pipe (20), the transmission disc (21) is embedded in the groove (17), a plurality of extrusion plates (22) curved in one direction are arranged on the outer periphery of the transmission disc (21), an elastic space (23) is formed between one side of the extrusion plates (22) and the outer periphery of the transmission disc (21), and extrusion protrusions (24) are arranged on the other side of the extrusion plates (22).

5. The in-line gear box drive rod assembly for a lift table leg of claim 4, wherein: The oil outlet pipe (9) and the pressurizing pipe (11) are provided with a baffle (25), one side of the baffle (25) close to the pressurizing pipe (11) is connected with a reset spring (26), the end of the reset spring (26) is connected with a piston (27), the side of the baffle (25) is provided with a communication groove (28), when the reset spring (26) is contracted, the pressurizing pipe (11) is communicated with the oil outlet pipe (9) through the communication groove (28), the annular oil cavity (8) and the pressurizing pipe (11) are connected with an oil supply groove (29).

6. The in-line gear box drive rod assembly for a lift table leg of claim 5, wherein: The oil supply groove (29) is hinged with a cover plate (30) at one end close to the pressurizing pipe (11), the diameter of the cover plate (30) is larger than that of the oil supply groove (29).

7. The in-line gear box drive rod assembly for a lift table leg of claim 6, wherein: The annular oil cavity (8) is provided with an elastic contraction air bag (31) inside, the annular oil cavity (8) is provided with an oil delivery hole (32) inside the elastic contraction air bag (31), and the annular oil cavity (8) is provided with a gas pressure balance hole (33) outside the elastic contraction air bag (31).

8. The in-line gear box drive rod assembly for a lift table leg of claim 7, wherein: The bottom of the output rod (3) is provided with a threaded part (34), the inside of the output rod (3) is provided with a plurality of transmission pipes (35), the middle of the gear disc (5) is provided with a plurality of first transmission ports (36), the first transmission ports (36) are connected with one end of the transmission pipes (35), and the threaded part (34) is provided with a plurality of second transmission ports (37).

9. The in-line gear box drive rod assembly for a lift table leg of claim 8, wherein: A plurality of the transmission pipes (35) are provided with a plurality of anti-blocking discs (38) at intervals, the inside of the anti-blocking disc (38) is provided with a hollow structure, and the inside of the anti-blocking disc (38) is communicated with a plurality of the transmission pipes (35).

10. The in-line gear box drive rod assembly for a lift table leg of claim 9, wherein: The oil outlet pipe (9) is connected with a spray head (39) at one end outward, and the spray head (39) is provided with a plurality of inclined spray holes (40).

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