A screw lift

Abstract

The present invention relates to the technical field of screw lifts and discloses a screw lift, which solves the problem that in conventional screw lifts, there are multiple dead angles in the flow of lubricating oil inside, so that the lubricating oil cannot be fully utilized. The invention utilizes the worm body to drive the rotation of the turbine body, and synchronously drives the rotation of an integral annular mounting seat. The annular mounting seat drives the inclined clamping ring and the undulating annular plate to rotate, so that the arc-shaped piston sleeve is driven by it, and the edge performs a cyclic undulating lifting and lowering motion. The arc-shaped piston sleeve cooperates with the extrusion channel to respectively pump the lubricating liquid of the upper cavity into the middle cavity, and pump the lubricating liquid of the middle cavity into the lower cavity, so as to form a flow effect, avoid the existence of dead angles in the flow of the lubricating oil, and make full use of the lubricating oil.

Description

Technical Field

[0001] The invention relates to the technical field of screw rod lifts, in particular to a screw rod lift. Background Art

[0002] The screw lift is a commonly used lifting mechanism. Its working principle is mainly based on the screw transmission mechanism. It is widely used in industry, construction and automation. The screw transmission mechanism includes a turbine and a worm. Its transmission connection needs to be used with a lubrication mechanism to reduce its wear. The lubrication mechanism includes grease and lubricating oil.

[0003] The lubricating oil needs to be replaced regularly during the operation of the screw lift, especially in dusty environments, where the replacement cycle is more frequent. For the internal space of the screw lift, the lubricating oil in the area around the turbine and worm tends to flow more frequently, while the lubricating oil in other areas close to the dead angle has insufficient fluidity, such as near the upper and lower bearings used to rotate the turbine. When the lubricating oil in the casing cavity is replaced, all of it is replaced. This results in: on the one hand, the lubricating oil in the cavity is not fully utilized; on the other hand, when the turbidity of the discharged lubricating oil is judged by observing its turbidity, the actual turbidity of the lubricating oil flowing around the turbine and worm is often more serious, which is not conducive to controlling the lubricating oil replacement cycle. Summary of the invention

[0004] The object of the present invention is to provide a screw lift, which solves the problem that in a conventional screw lift, there are multiple dead angles in the flow of lubricating oil inside, so that the lubricating oil cannot be fully utilized.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a screw lift, comprising a housing and a turbine mechanism, the housing being provided with a worm body driving the turbine mechanism and a screw body driven by the turbine mechanism, the turbine mechanism comprising a turbine body, the turbine body being coaxially and integrally provided with a bearing inner ring and an annular mounting seat on the upper and lower parts thereof, the outer surface of the bearing inner ring being rotatably mounted with a bearing outer ring, the outer surface of the annular mounting seat being fixedly mounted with a pump mechanism for driving the flow of lubricating oil;

[0006] A vertical cavity is provided on the inner side of the shell, and two annular fixing seats are fixedly provided on the upper and lower sides of the vertical cavity, which divide the vertical cavity into an upper cavity, a middle cavity and a lower cavity. The turbine body is located in the middle cavity between the two annular fixing seats and is coaxially arranged. The outer ring of the bearing is fixedly nested inside the annular fixing seat. The two pumping mechanisms are respectively located inside the upper cavity and the lower cavity. An annular oil storage tank is provided on the upper surface of the shell, and the annular oil storage tank is communicated with the inner side of the upper cavity. A return oil pipe is provided on one side of the annular oil storage tank to communicate with the lower cavity.

[0007] The pumping mechanism includes a clamping ring obliquely fixed on the outer surface of the annular mounting seat, and the outer side of the clamping ring is coaxially embedded with an undulating annular plate, and the undulating annular plate is circumferentially movably provided with a plurality of arc-shaped piston sleeves, and the curvature of the plurality of arc-shaped piston sleeves is concentric with the geometric center of the clamping ring. The pumping mechanism also includes an annular pumping seat fixed on the side of the annular fixing seat away from the turbine body, and the surface of the annular pumping seat is provided with an extrusion channel that cooperates with the arc-shaped piston sleeve, and the extrusion channel leads to the middle cavity, and the upper cavity is unidirectionally connected to the middle cavity through the extrusion channel, and the middle cavity is unidirectionally connected to the lower cavity through the extrusion channel.

[0008] As a further description of the above technical solution: the extrusion channel includes an arc-shaped piston cylinder opened on the upper surface of the annular pump liquid seat, the arc-shaped piston sleeve moves inside the arc-shaped piston cylinder, the inner wall of the arc-shaped piston cylinder is opened with a connecting cavity connected to the inner side of the annular pump liquid seat, a first one-way valve is arranged in the arc-shaped piston sleeve, and a second one-way valve is arranged in the connecting cavity.

[0009] As a further description of the above technical solution: the arc-shaped piston sleeve is rotatably connected to the undulating annular plate through a rotating sleeve connected on one side, and an arc-shaped sealing ring is fixedly connected to the lower surface of the undulating annular plate. The outer surface of the arc-shaped sealing ring is an arc surface with the geometric center of the retaining ring as the sphere center, and the inner side of the annular pump liquid seat is provided with a fitting arc surface that movably cooperates with the arc surface of the arc-shaped sealing ring.

[0010] As a further description of the above technical solution: a horizontal stirring rod is fixedly installed in the lower cavity and on one side of the annular mounting seat.

[0011] As a further description of the above technical solution: an observation tube is connected to one end of the oil return pipe close to the lower cavity.

[0012] As a further description of the above technical solution: a three-way valve is also connected between the observation tube and the lower cavity, the annular oil storage tank includes an annular side wall, an inwardly concave annular groove is provided on the lower side of the inner wall of the annular side wall, a connecting port connected to the oil return pipe is provided on the upper side of the inner wall of the annular side wall, and an oil transfer valve connected to the annular groove is provided at the lower side opposite to the connecting port.

[0013] As a further description of the above technical solution: the inner wall of the annular side wall is piston-shaped and provided with an annular piston plate for upward and downward movement. A guide column for limiting its horizontal upward and downward movement is arranged on the surface of the annular piston plate. The guide column is located on the surface below the annular piston plate and is sleeved with a height-limiting spring. The height of the height-limiting spring is slightly higher than the vertical height of the annular groove.

[0014] As a further description of the above technical solution: a through connecting hole A is opened on the surface of the annular fixed seat at the positions of several corresponding arc-shaped piston cylinders, and the connecting hole A connects the arc-shaped piston cylinder with the middle cavity movably. A closed hole is opened on the inner wall of the connecting hole A and penetrates to the outer surface of the shell. The cross-sectional diameter of the closed hole is larger than the cross-sectional diameter of the connecting hole A. A sealing screw A is threadedly connected to the inner side of the closed hole, and a threaded groove cooperating with the sealing screw A is provided on the inner wall of the closed hole.

[0015] As a further description of the above technical solution: a worm cavity for installing the worm body is provided on one side of the middle cavity, a connecting hole C is provided on the upper surface of the worm cavity, a connecting hole B is provided on the upper surface of the annular fixing seat above the worm cavity and is connected to the connecting hole C, and a sealing screw B is provided on the outer surface of the shell which is threaded and movably inserted into the inner side of the connecting hole C for movably isolating it.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. The worm body is used to drive the rotation of the turbine body, and the annular mounting seat formed integrally therewith is driven to rotate synchronously. The annular mounting seat drives the inclined retaining ring and the undulating annular plate to rotate, so that the arc-shaped piston sleeve is driven by it to perform a circular undulating lifting and lowering motion. The arc-shaped piston sleeve cooperates with the extrusion channel to pump the lubricating fluid of the upper cavity into the middle cavity, and the lubricating fluid of the middle cavity into the lower cavity, respectively, to form a flow effect and avoid dead corners in the flow of lubricating oil. During this period, the lubricating oil also passes between the outer ring of the bearing and the inner ring of the bearing, and the lubricating oil inside is pushed and replaced, thereby achieving the effect of real-time replacement of lubricating oil in the upper and lower bearings where the turbine body is installed, which are difficult to clean.

[0018] 2. Two implementation structures and operation methods for replacing the internal lubricating oil are designed. The outlet is connected to the annular oil storage tank by adjusting the three-way valve, and then new lubricating oil is injected into the annular oil storage tank at a certain pressure through the oil delivery valve. The turbid lubricating oil is discharged in the opposite direction through the return oil pipe and the three-way valve. The simple oil change can be used in scenarios where the device maintenance time is short and needs to be put into use quickly; and after completing the simple oil change, the connecting hole A is connected to the arc piston cylinder and the middle cavity by rotating multiple sealing screws A, and then the three-way valve is rotated to connect its outlet with the lower cavity, and then the oil delivery valve is used to inject new lubricating oil with pressure. The newly injected lubricating oil squeezes the turbid lubricating oil in a laminated manner and flows to the outlet of the three-way valve, thereby achieving the purpose of overall oil change in the vertical cavity space. The two oil injection methods make it more flexible for different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the housing of the present invention;

[0022] Figure 4 It is a schematic diagram of the turbine mechanism, pump mechanism and annular fixing seat structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the turbine mechanism structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the pump mechanism of the present invention;

[0025] Figure 7 It is a schematic diagram of the logical structure of the pump mechanism of the present invention;

[0026] Figure 8 This is a schematic diagram of the disassembled structure of the liquid pump mechanism of the present invention;

[0027] Fig. 9 It is a schematic diagram of the internal cross-sectional structure of the annular fixing seat of the present invention;

[0028] Fig.10 It is a schematic diagram of the internal structure of the annular oil storage tank of the present invention.

[0029] In the figure: 10, housing; 11, worm body; 12, screw body; 13, worm cavity; 20, annular oil storage tank; 201, annular side wall; 202, annular groove; 203, connection port; 204, oil delivery valve; 21, oil return pipe; 211, observation pipe; 212, three-way valve; 22, annular piston plate; 221, guide column; 222, height limiting spring; 30, turbine mechanism; 31, turbine body; 32, bearing outer ring; 33, bearing inner ring; 34, annular mounting seat; 40. Pumping mechanism; 41. Retaining ring; 42. Undulating annular plate; 421. Arc surface sealing ring; 43. Arc-shaped piston sleeve; 431. Rotating sleeve; 432. First non-return valve; 44. Annular pumping seat; 441. Arc-shaped piston cylinder; 442. Connecting chamber; 443. Second non-return valve; 444. Fitting arc surface; 50. Annular fixing seat; 51. Connecting hole A; 52. Closing hole; 53. Sealing screw A; 54. Connecting hole B; 55. Connecting hole C; 56. Sealing screw B. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0032] Combination Figure 1-Figure 10 A screw lift includes a housing 10 and a turbine mechanism 30. The housing 10 is provided with a worm body 11 driving the turbine mechanism 30 and a screw body 12 driven by the turbine mechanism 30. The turbine mechanism 30 includes a turbine body 31. The turbine body 31 is coaxially and integrally provided with a bearing inner ring 33 and an annular mounting seat 34 on the upper and lower parts thereof. The outer surface of the bearing inner ring 33 is rotatably assembled with a bearing outer ring 32 through a ball bearing. The bearing outer ring 32 and the bearing inner ring 33 together form a bearing for rotatable mounting of the turbine body 31. The outer surface of the annular mounting seat 34 is fixedly assembled with a pump mechanism 40 for driving the flow of lubricating oil.

[0033] A vertical cavity is provided inside the housing 10, and two annular fixing seats 50 are fixedly provided at the upper and lower parts of the vertical cavity, which divide the vertical cavity into an upper cavity, a middle cavity and a lower cavity. The turbine body 31 is located in the middle cavity between the two annular fixing seats 50 and is coaxially arranged. The bearing outer ring 32 is fixedly nested inside the annular fixing seat 50. Two pumping mechanisms 40 are respectively located inside the upper cavity and the lower cavity. An annular oil storage tank 20 is provided on the upper surface of the housing 10, and the annular oil storage tank 20 is connected to the inner side of the upper cavity. A return oil pipe 21 is provided on one side of the annular oil storage tank 20 to connect to the lower cavity.

[0034] The pump mechanism 40 includes a clamping ring 41 which is fixed obliquely on the outer surface of the annular mounting seat 34, and an undulating annular plate 42 is coaxially and rotatably embedded on the outer side of the clamping ring 41. The undulating annular plate 42 is circumferentially provided with a plurality of arcuate piston sleeves 43, and the arcs of the plurality of arcuate piston sleeves 43 are arranged concentrically with the geometric center of the clamping ring 41. The pump mechanism 40 also includes an annular pump seat 44 fixed on the side of the annular fixing seat 50 away from the turbine body 31, and an extrusion channel cooperating with the arcuate piston sleeve 43 is provided on the surface of the annular pump seat 44, and the extrusion channel leads to the middle cavity, and the upper cavity is unidirectionally connected to the middle cavity through the extrusion channel, and the middle cavity is unidirectionally connected to the lower cavity through the extrusion channel;

[0035] In view of the phenomenon that there are dead angles and insufficient flow of lubricating oil in the vertical cavity, in this embodiment, the worm body 11 drives the turbine body 31 to rotate, so as to meet the basic function of the turbine mechanism 30 driving the screw body 12 to move up and down relative to each other. When the turbine body 31 rotates, the annular mounting seat 34 integrally arranged on one side thereof will drive the inclined retaining ring 41 to rotate, and the edge of the undulating annular plate 42 is driven by the retaining ring 41 to perform cyclic undulating and lifting movements, thereby further driving the arc-shaped piston sleeve 43 connected to its edge to perform cyclic lifting and lowering movements. Through the lifting and lowering movements of the arc-shaped piston sleeve 43 and the cooperation of the extrusion channel, the lubricating liquid of the upper cavity is pumped into the middle cavity, and the lubricating liquid of the middle cavity is pumped into the lower cavity, so that the lubricating oil forms a flow effect between the upper cavity, the middle cavity and the lower cavity, so as to avoid the existence of dead angles for the flow of lubricating oil in the vertical cavity; the lubricating oil flowing into the lower cavity returns to the annular oil storage tank 20 through the return oil pipe 21, and the lubricating oil in the annular oil storage tank 20 can be replenished into the upper cavity.

[0036] Combination Figure 6-Figure 8 In a further embodiment, the extrusion channel includes an arc-shaped piston cylinder 441 opened on the upper surface of the annular pump liquid seat 44, the arc-shaped piston sleeve 43 moves inside the arc-shaped piston cylinder 441, and the inner wall of the arc-shaped piston cylinder 441 is provided with a connecting cavity 442 connected to the inner side of the annular pump liquid seat 44, a first one-way valve 432 is arranged in the arc-shaped piston sleeve 43, and a second one-way valve 443 is arranged in the connecting cavity 442. For the lubricating oil to flow from the upper cavity to the middle cavity, the first one-way valve 432 and the second one-way valve 443 are unidirectionally connected from the upper cavity to the middle cavity, wherein, when the arc-shaped piston sleeve 43 slides out of the arc-shaped piston cylinder 441, the lubricating oil enters the inner side of the arc-shaped piston cylinder 441 in one direction, and when the arc-shaped piston sleeve 43 is pressed down on the inner side of the arc-shaped piston cylinder 441, the lubricating oil in the cavity is pressed out through the second one-way valve 443 to the middle cavity. The inner side of the annular pump liquid seat 44, and then the lubricating oil on the inner side of the annular pump liquid seat 44 enters into the middle cavity through the gap between the bearing outer ring 32 and the bearing inner ring 33, and a distance is left between the bearing outer ring 32 and the surface of the turbine body 31 for the lubricating oil to pass through; for the lubricating oil flowing from the middle cavity to the lower cavity, the corresponding first one-way valve 432 and the second one-way valve 443 are connected to the lower cavity in one direction from the middle cavity; through the above structure, in the forward and reverse rotation of the turbine body 31, the arcuate piston sleeve 43 will move up and down in the arcuate piston cylinder 441, so as to achieve the purpose of pumping liquid, and the lubricating oil passes between the bearing outer ring 32 and the bearing inner ring 33, and the flowing lubricating oil will also push and replace the lubricating oil inside it, which can also form a good replacement effect for the part where it is difficult to replace the lubricating oil.

[0037] Combination Figure 6-Figure 8In a further embodiment, the arc-shaped piston sleeve 43 is rotatably connected to the undulating annular plate 42 through a rotating sleeve 431 connected on one side, and an arc-shaped sealing ring 421 is fixedly connected to the lower surface of the undulating annular plate 42. The outer surface of the arc-shaped sealing ring 421 is an arc surface with the geometric center of the retaining ring 41 as the spherical center, and the inner side of the annular pump liquid seat 44 is provided with a fitting arc surface 444 that movably cooperates with the arc surface of the arc-shaped sealing ring 421, that is, the outer arc surface of the arc-shaped sealing ring 421 and the arc surface of the fitting arc surface 444 are on a common spherical surface. The edge of the undulating annular plate 42 is driven by the clamping ring 41, and is in an up-and-down undulation. The contacting arc surface 444 and the arc surface sealing ring 421 form a sealing effect between the annular pump liquid seat 44 and the undulating annular plate 42, so as to prevent the lubricating oil that enters the inner side of the annular pump liquid seat 44 through the second one-way valve 443 from flowing back to one side of the annular pump liquid seat 44 in large quantities, so that the lubricating oil cannot flow along the preset path; the arc piston sleeve 43 is rotatably connected to the undulating annular plate 42 by the rotating sleeve 431. The purpose is: during the up and down up and down movement of the edge of the undulating annular plate 42, the arc-shaped piston sleeve 43 can adapt to the angle change of the edge of the undulating annular plate 42, and the arc-shaped piston sleeve 43 is movably embedded in the annular pump liquid seat 44, which can also limit the rotation of the undulating annular plate 42, thereby preventing the undulating annular plate 42 from rotating with the retaining ring 41. As a result, the edge of the undulating annular plate 42 is on a spherical surface that only moves on the vertical plane, thereby satisfying the reciprocating movement of multiple arc-shaped piston sleeves 43 in the corresponding arc-shaped piston cylinder 441.

[0038] In a further embodiment, a horizontal stirring rod is fixedly installed in the lower cavity and on one side of the annular mounting seat 34, which is not shown in the figure. When the lubricating oil in the middle cavity flows to the lower cavity through the corresponding extrusion channel, the stirring rod can form a horizontal stirring effect, so that the lubricating oil in the lower cavity flows in a ring shape in the cavity, and thus flows evenly to the inner side of the return oil pipe 21.

[0039] Combination Figure 1 In a further embodiment, an observation tube 211 is connected to one end of the oil return pipe 21 near the lower cavity. The observation tube 211 is set to be transparent. When the lubricating oil in the lower cavity flows back to the annular oil storage tank 20 through the oil return pipe 21, the turbidity of the lubricating oil inside the vertical cavity can be directly observed through the observation tube 211.

[0040] Combination Figure 2 , 3, 9, 10, in a further embodiment, a three-way valve 212 is further connected between the observation tube 211 and the lower cavity, the annular oil storage tank 20 includes an annular side wall 201, an annular groove 202 recessed inwardly is provided on the lower side of the inner wall of the annular side wall 201, a connecting port 203 communicating with the oil return pipe 21 is provided on the upper side of the inner wall of the annular side wall 201, and an oil delivery valve 204 communicating with the annular groove 202 is provided below the side opposite to the connecting port 203;

[0041] The inner wall of the annular side wall 201 is provided with an annular piston plate 22 that moves upward and downward in a piston-like manner. A guide column 221 that limits its horizontal upward and downward movement is provided on the surface of the annular piston plate 22. The guide column 221 is located below the annular piston plate 22 and is sleeved with a height-limiting spring 222. The height of the height-limiting spring 222 is slightly higher than the vertical height of the annular groove 202.

[0042] The surface of the annular fixing seat 50 is provided with connecting holes A51 at positions corresponding to the arc-shaped piston cylinder 441. The connecting holes A51 movably connect the arc-shaped piston cylinder 441 with the middle cavity. The inner wall of the connecting hole A51 is provided with a closed hole 52 that penetrates the outer surface of the shell 10. The cross-sectional diameter of the closed hole 52 is larger than the cross-sectional diameter of the connecting hole A51. The inner side of the closed hole 52 is threadedly connected with a sealing screw A53. The inner wall of the closed hole 52 is provided with a thread groove that cooperates with the sealing screw A53.

[0043] The lubricating oil that flows back to the inner side of the oil storage tank 20 at the annular position through the oil return pipe 21 will squeeze the annular piston plate 22 downward. When the annular piston plate 22 is pressed to the horizontal range of the annular groove 202, the lubricating oil above the annular piston plate 22 can flow to the bottom through the annular groove 202, so as to be conveniently replenished into the upper cavity;

[0044] There are two methods for replacing the lubricating oil in the device: one is a simple oil change, which can be used in the scenario where the device maintenance time is short and needs to be put into use quickly. By adjusting the three-way valve 212, the outlet is connected to the annular oil storage tank 20, and then new lubricating oil is injected into the annular oil storage tank 20 at a certain pressure through the oil delivery valve 204, wherein the elastic force of the height limiting spring 222 can ensure that the annular piston plate 22 is located above the inlet of the oil delivery valve 204. During the oil injection process, it will push up the annular piston plate 22 so that the previously turbid lubricating oil is discharged in the reverse direction through the return oil pipe 21 and the three-way valve 212. The annular piston plate 22 can play a better isolation effect. After the observation tube 211 observes that the new lubricating oil passes through and the three-way valve 212 discharges the new oil in time, the valves of the three-way valve 212 and the oil delivery valve 204 can be closed to complete the simple oil change process. The newly replaced lubricating oil will gradually mix into the lubricating oil in the middle cavity, thereby reducing its turbidity so as to meet the use standard;

[0045] Secondly, for the overall oil change of the vertical cavity space, based on the completion of the above-mentioned simple oil change, multiple sealing screws A53 on the outside of the rotating shell 10 are used to make the connecting hole A51 connect the arc piston cylinder 441 and the middle cavity, and the three-way valve 212 is also rotated to make the outlet of the three-way valve 212 and the lower cavity in a connected state. At this time, the oil delivery valve 204 is used to inject new lubricating oil with pressure. The density of the newly injected lubricating oil will be lower than that of the turbid lubricating oil, and it will flow through the connecting holes A51 on the surfaces of the upper and lower annular fixing seats 50 in turn, squeezing the turbid lubricating oil in a laminating manner, so that it flows to the outlet of the three-way valve 212, thereby achieving the purpose of overall oil change in the vertical cavity space;

[0046] A worm cavity 13 for installing the worm body 11 is provided on one side of the middle cavity, a connecting hole C55 is provided on the upper surface of the worm cavity 13, a connecting hole B54 is provided on the upper surface of the annular fixing seat 50 above the worm cavity 13 and is connected to the connecting hole C55, and a sealing screw B56 is provided on the outer surface of the shell 10, which is threaded and movably inserted into the inner side of the connecting hole C55 for movably isolating it. In the overall oil change of the above-mentioned vertical cavity space, it is movably connected to the worm cavity 13 through the connecting holes B54 and C55. When changing the oil, the sealing screw B56 is rotated in the same way to keep the connecting hole C55 connected to the worm cavity 13. The new lubricating oil entering through the connecting hole B54 will enter the worm cavity 13, thereby replacing the turbid lubricating oil in the space of the worm cavity 13.

[0047] Working principle: The worm body 11 drives the turbine body 31 to rotate, and synchronously drives the integrally formed annular mounting seat 34 to rotate, and the annular mounting seat 34 drives the inclined retaining ring 41 to rotate, and the edge of the undulating annular plate 42 is driven by the retaining ring 41 to perform cyclic ups and downs, further driving the arc-shaped piston sleeve 43 at its edge to perform cyclic ups and downs. Through the lifting action of the arc-shaped piston sleeve 43 and the cooperation of the arc-shaped piston cylinder 441 and the connecting cavity 442, the lubricating fluid of the upper cavity is pumped into the middle cavity, and the lubricating fluid of the middle cavity is pumped into the lower cavity, wherein the lubricating oil The lubricating oil will also be pushed and replaced between the bearing outer ring 32 and the bearing inner ring 33; the lubricating oil will flow between the upper cavity, the middle cavity and the lower cavity, and the lubricating oil flowing into the lower cavity will return to the annular oil storage tank 20 through the return oil pipe 21. The lubricating oil returning to the inner side of the annular oil storage tank 20 will squeeze the annular piston plate 22 downward. When the annular piston plate 22 is pressed to the horizontal range of the annular groove 202, the lubricating oil above the annular piston plate 22 can flow to the bottom through the annular groove 202 and then be replenished into the upper cavity, thereby achieving the purpose of circulation.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screw lift, comprising a housing (10) and a worm gear mechanism (30), wherein the housing (10) is provided with a worm body (11) driving the worm gear mechanism (30), and a screw body (12) driven by the worm gear mechanism (30), characterized in that: The worm gear mechanism (30) comprises a worm gear body (31), wherein a bearing inner ring (33) and an annular mounting seat (34) are coaxially and integrally provided on the upper and lower parts of the worm gear body (31), a bearing outer ring (32) is rotatably mounted on the outer surface of the bearing inner ring (33) via a ball, and a pump mechanism (40) for driving the flow of lubricating oil is fixedly mounted on the outer surface of the annular mounting seat (34); A vertical cavity is provided inside the housing (10), and two annular fixing seats (50) are fixedly provided at the upper and lower parts of the vertical cavity, which divide the vertical cavity into an upper cavity, a middle cavity, and a lower cavity. The worm wheel body (31) is located in the middle cavity between the two annular fixing seats (50) and is coaxially arranged. The bearing outer ring (32) is fixedly nested inside the annular fixing seats (50). The two pumping mechanisms (40) are respectively located inside the upper cavity and the lower cavity. An annular oil storage tank (20) is provided on the upper surface of the housing (10), and the annular oil storage tank (20) is communicated with the inner side of the upper cavity. A return oil pipe (21) is provided on one side of the annular oil storage tank (20) and is communicated with the lower cavity. The pumping mechanism (40) comprises a clamping ring (41) fixed obliquely on the outer surface of the annular mounting seat (34); an undulating annular plate (42) is coaxially rotatably embedded on the outer side of the clamping ring (41); a plurality of arcuate piston sleeves (43) are circumferentially movable on the undulating annular plate (42); the arcs of the plurality of arcuate piston sleeves (43) are arranged concentrically with the geometric center of the clamping ring (41); the pumping mechanism (40) further comprises an annular pumping seat (44) fixed on a side of the annular fixing seat (50) away from the worm wheel body (31); an extrusion channel cooperating with the arcuate piston sleeve (43) is provided on the surface of the annular pumping seat (44); the extrusion channel leads to the middle cavity; the upper cavity is unidirectionally connected to the middle cavity via the extrusion channel; and the middle cavity is unidirectionally connected to the lower cavity via the extrusion channel.

2. A screw lift according to claim 1, characterized in that: The extrusion channel comprises an arc-shaped piston cylinder (441) provided on the upper surface of the annular pump fluid seat (44); the arc-shaped piston sleeve (43) moves inside the arc-shaped piston cylinder (441); the inner wall of the arc-shaped piston cylinder (441) is provided with a connecting cavity (442) connected to the inner side of the annular pump fluid seat (44); a first one-way valve (432) is provided in the arc-shaped piston sleeve (43); and a second one-way valve (443) is provided in the connecting cavity (442).

3. A screw lift according to claim 2, characterized in that: The arc-shaped piston sleeve (43) is rotatably connected to the undulating annular plate (42) via a rotating sleeve (431) connected at one side; a cambered sealing ring (421) is fixedly connected to the lower surface of the undulating annular plate (42); the outer surface of the cambered sealing ring (421) is an arc surface with the geometric center of the retaining ring (41) as the spherical center; and a fitting arc surface (444) is provided on the inner side of the annular pump fluid seat (44) for movably cooperating with the arc surface of the cambered sealing ring (421).

4. A screw lift according to claim 1, characterized in that: A horizontal stirring rod is fixedly mounted in the lower cavity and on one side of the annular mounting seat (34).

5. The screw lift according to claim 1, characterized in that: An observation tube (211) is connected to one end of the oil return pipe (21) close to the lower cavity.

6. A screw lift according to claim 5, characterized in that: A three-way valve (212) is also connected between the observation tube (211) and the lower cavity. The annular oil storage tank (20) comprises an annular side wall (201). An inwardly concave annular groove (202) is provided on the lower side of the inner wall of the annular side wall (201). A connecting port (203) communicating with the oil return pipe (21) is provided on the upper side of the inner wall of the annular side wall (201). An oil delivery valve (204) communicating with the annular groove (202) is provided below the side opposite to the connecting port (203).

7. A screw lift according to claim 6, characterized in that: An annular piston plate (22) is provided on the inner wall of the annular side wall (201) so as to move upward and downward in a piston-like manner. A guide column (221) is provided through the surface of the annular piston plate (22) to limit its horizontal upward and downward movement. A height-limiting spring (222) is sleeved on the surface of the guide column (221) below the annular piston plate (22). The height of the height-limiting spring (222) is higher than the vertical height of the annular groove (202).

8. A screw lift according to claim 7, characterized in that: The surface of the annular fixing seat (50) is provided with penetrating communication holes A (51) at positions corresponding to a plurality of arc-shaped piston cylinders (441), and the communication holes A (51) movably connect the arc-shaped piston cylinder (441) with the middle cavity. The inner wall of the communication hole A (51) is provided with a closed hole (52) penetrating to the outer surface of the shell (10), and the cross-sectional diameter of the closed hole (52) is larger than the cross-sectional diameter of the communication hole A (51). The inner side of the closed hole (52) is threadedly connected with a sealing screw A (53), and the inner wall of the closed hole (52) is provided with a thread groove that cooperates with the sealing screw A (53).

9. A screw lift according to claim 8, characterized in that: A worm cavity (13) for mounting a worm body (11) is provided on one side of the middle cavity, a connecting hole C (55) is provided on the upper surface of the worm cavity (13), a connecting hole B (54) is provided on the upper surface of the annular fixing seat (50) above the worm cavity (13) and is connected to the connecting hole C (55), and a sealing screw B (56) is provided on the outer surface of the housing (10) and is threaded and movably inserted into the inner side of the connecting hole C (55) for movably isolating the connecting hole.

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