Maintenance-free screw-type hoist

Abstract

The application provides a maintenance-free screw type opening and closing machine, which comprises a bottom plate, a support fixed on the bottom plate, a shell installed on the support, a cover body fixedly installed on the top of the shell, a worm wheel and two worm shafts rotatably installed in the shell and meshing with each other, a control screw spirally installed in the middle of the worm wheel, a shielding assembly arranged on the shell and the control screw, a driving assembly installed on the support and the two worm shafts, a stabilizing piece arranged in the support, a cleaning assembly installed on the stabilizing piece, movable holes opened in the shell, the cover body, the support and the bottom plate, and a lubricating assembly installed on the shell and the shielding assembly. The maintenance-free screw type opening and closing machine can work when the equipment works, drive the arranged lubricating assembly to work while controlling the shielding assembly to move, and maintain the control screw, the worm wheel and the two worm shafts in the shell, so that the service life of the equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of screw-type gate hoists, and in particular to a maintenance-free screw-type gate hoist. Background Art

[0002] A screw-type gate hoist is a machine that uses a threaded rod connected to the gate leaf directly or through a guide slider and connecting rod. The screw moves up and down to open and close the gate. With the widespread development of water conservancy and hydropower projects, gate hoists are widely used in projects such as reservoir irrigation areas, river dams, and hydropower stations.

[0003] However, the existing screw-type gate hoist has some defects or shortcomings:

[0004] Screw-type gate openers are generally located in high-temperature and relatively humid environments, and existing screw-type gate openers lack effective maintenance structures when in use. The threaded rods and internal structures of the screw gate openers are very easy to rust after long-term use, which can easily accelerate wear and tear, and cause rust, causing the internal transmission structure to jam, affecting normal use; and because the lower end of the threaded rod is generally exposed to the outside, it is easy to be contaminated with dust and other foreign particles. When the screw is working and rising, impurities can easily enter the equipment. As the transmission structure works, it is easy to cause wear on the screw and transmission structure, affecting the service life. Summary of the Invention

[0005] The purpose of the present invention is to provide a maintenance-free screw hoist to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a maintenance-free screw-type gate opening and closing machine, comprising: a base plate, a bracket fixed on the base plate, a shell mounted on the bracket, a cover body fixedly mounted on the top of the shell, a worm wheel and two worms rotatably mounted in the shell and meshing with each other, a control screw screwed in the middle of the worm wheel, a shielding assembly arranged on the shell and the control screw, a driving assembly mounted on the bracket and the two worms, a stabilizing member arranged in the bracket, a cleaning assembly mounted on the stabilizing member, movable holes provided in the shell, the cover body, the bracket and the base plate, and a lubrication assembly mounted on the shell and the shielding assembly, wherein

[0007] The shielding assembly is adapted to shield the top of the control screw and to move synchronously with the movement of the control screw at any time;

[0008] The driving assembly is suitable for controlling the worm gear to rotate under different conditions;

[0009] The stabilizing member is suitable for improving the stability of the control screw during operation;

[0010] The cleaning assembly is adapted to interfere with the thread groove at the lower end of the control screw;

[0011] The lubrication assembly is suitable for synchronously spraying lubricating oil on the worm wheel, the control screw and one of the worms when the shielding assembly is working.

[0012] Furthermore, the lubrication assembly includes a storage tank fixed to the outer wall of the shell, a sealing cover spirally mounted on the top of the storage tank, a piston movably arranged in the sealing cover, a sliding rod fixed to the upper surface of the piston and slidably mounted on the sealing cover, a return spring movably sleeved on the sliding rod and fixedly connected between the piston and the sealing cover, a limiting ring fixed in the storage tank, a control member mounted on the sliding rod and the shielding assembly, a first one-way valve connected to the lower end of the storage tank through a pipeline, a first oil pipe connected to the other end of the first one-way valve, a second oil pipe connected to the first oil pipe, a plurality of nozzles respectively connected to the first oil pipe and the second oil pipe, a second one-way valve connected to the storage tank, and an air intake pipe connected to the other end of the second one-way valve;

[0013] The plurality of nozzles on the first oil pipe are all arranged at the meshing position between the worm wheel and one of the worms;

[0014] The nozzle on the second oil pipe is arranged at the spiral connection between the control screw and the worm gear.

[0015] Furthermore, the control member includes a collar fixedly sleeved on the slide rod, a control ring fixed on the shielding assembly and movably sleeved on the slide rod and the collar, a plurality of movable grooves in an annular array provided in the control ring, a plurality of pressure rods movably mounted in the plurality of movable grooves, and a plurality of control springs respectively arranged in the plurality of movable grooves;

[0016] One end of the plurality of control springs is fixedly connected to the plurality of pressure rods, and the other end of the plurality of control springs is fixedly connected to the inner walls of the plurality of movable grooves;

[0017] The upper surface and the lower surface of the retaining ring are both inclined surfaces.

[0018] Furthermore, the shielding assembly includes a bearing seat mounted on the upper end of the control screw, a shielding cover fixed on the bearing seat, two guide rods symmetrically fixed to the lower surface of the shielding cover, two limit blocks symmetrically fixed to the housing, and two guide grooves respectively provided on the two limit blocks;

[0019] The two guide rods are respectively fitted and slidably inserted into the two guide grooves;

[0020] The control ring is fixed on the shielding cover.

[0021] Furthermore, the stabilizing member includes a stabilizing plate fixed in the bracket, and a stabilizing column installed on the upper surface of the stabilizing plate;

[0022] The stabilizing column is threadably connected to the control screw.

[0023] Furthermore, the cleaning assembly includes a slide groove opened on the stabilizing plate, a displacement seat slidably installed in the slide groove, a scraper fixed at the bottom of the displacement seat, a threaded scraping groove opened on the scraper and matched with the control screw thread, and an adjusting screw threadedly installed in the slide groove and rotatably connected to the displacement seat.

[0024] Furthermore, the lubrication assembly also includes an oil inlet pipe connected to the storage tank, an oil cap threadedly mounted on the other end of the oil inlet pipe, and a transparent observation window provided on the storage tank.

[0025] Furthermore, the drive assembly includes a drive motor mounted on the bracket, a first transmission wheel fixed to the output end of the drive motor, a second transmission wheel fixedly mounted on one of the worms, a transmission belt sleeved on the first transmission wheel and the second transmission wheel, a rotating disk inserted on the other worm, and a hook fixed to the bracket.

[0026] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0027] The maintenance-free screw-type gate opener can resist the lower end of the control screw during the operation of the equipment through the cleaning component, thereby scraping off dust and impurities adhering to the control screw during the movement of the control screw, preventing dust and impurities from entering the connection between the control screw and the worm gear in the housing, causing wear to the control screw and the worm gear during the operation of the equipment, and effectively extending the service life of the equipment;

[0028] The maintenance-free screw-type gate opener can shield the top of the control screw through the shielding component to prevent rainwater from entering the shell along the control screw and causing erosion to the equipment. When the equipment controls the gate to close, the shielding component is driven downward by the control screw, so that the control component can control the operation of the lubrication component, spray a certain amount of lubricating oil, and lubricate and maintain the control screw, worm gear and two worms in the shell. A lubrication maintenance operation can be performed each time the equipment is used to prevent the control screw, worm gear and two worms from rusting during long-term use, thereby ensuring the normal operation of the equipment. The operation of the control component is synchronized with the operation of the equipment, and the staff will not forget to apply the lubricating oil, thereby ensuring the maintenance effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and examples.

[0030] Figure 1 Shown is a perspective view of the present invention;

[0031] Figure 2 Shows a perspective view of another state of the present invention;

[0032] Figure 3 A partially cutaway perspective view of the present invention is shown. Figure 1 ;

[0033] Figure 4 The partially split three-dimensional Figure 1 ;

[0034] Figure 5 The partially split three-dimensional Figure 2 ;

[0035] Figure 6 The present invention is shown in a cutaway perspective view. Figure 2 ;

[0036] Figure 7 The present invention is shown Figure 3 A magnified view of point A;

[0037] Figure 8 The present invention is shown Figure 6 Enlarged view of point B.

[0038] In the picture

[0039] 1. Base plate; 2. Bracket; 3. Housing; 4. Cover; 5. Worm gear; 6. Worm; 7. Control screw; 8. Shielding assembly; 9. Drive assembly; 10. Stabilizer; 11. Cleaning assembly; 12. Active hole; 13. Lubrication assembly; 14. Storage tank; 15. Sealing cover; 16. Piston; 17. Sliding rod; 18. Return spring; 19. Limiting ring; 20. Control element; 21. First one-way valve; 22. First oil pipe; 23. Second oil pipe; 24. Nozzle; 25. Second one-way valve; 26. Inlet pipe; 27. Ring; 28. Control ring; 29. ​​Movable groove; 30. Pressure rod; 31. Control spring; 32. Shielding cover; 33. Bearing seat; 34. Guide rod; 35. Limit block; 36. Guide groove; 37. Stabilizing plate; 38. Stabilizing column; 39. Displacement seat; 40. Scraper; 41. Slide groove; 42. Threaded scraper groove; 43. Adjusting screw; 44. Oil inlet pipe; 45. Oil cover; 46. Transparent observation window; 47. Drive motor; 48. First transmission wheel; 49. Second transmission wheel; 50. Transmission belt; 51. Rotating disk; 52. Hook. DETAILED DESCRIPTION

[0040] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0041] like Figure 1-8 As shown, a maintenance-free screw-type gate opener includes: a base plate 1, a bracket 2 fixed on the base plate 1, a shell 3 installed on the bracket 2, a cover 4 fixedly installed on the top of the shell 3, a worm wheel 5 and two worms 6 rotatably installed in the shell 3 and meshing with each other, a control screw 7 spirally installed in the middle of the worm wheel 5, a shielding assembly 8 arranged on the shell 3 and the control screw 7, a driving assembly 9 installed on the bracket 2 and the two worms 6, a fixing member 10 arranged in the bracket 2, a cleaning assembly 11 installed on the fixing member 10, a movable hole 12 opened on the shell 3, the cover 4, the bracket 2 and the base plate 1, and a lubricating assembly 13 installed on the shell 3 and the shielding assembly 8, wherein

[0042] The shielding assembly 8 is adapted to shield the top of the control screw 7 and to move synchronously with the movement of the control screw 7;

[0043] The driving assembly 9 is suitable for controlling the rotation of the worm gear 5 under different conditions;

[0044] The stabilizing member 10 is adapted to improve the stability of the control screw 7 during operation;

[0045] The cleaning assembly 11 is adapted to interfere with the thread groove at the lower end of the control screw 7;

[0046] The lubricating component 13 is suitable for synchronously spraying lubricating oil on the worm gear 5, the control screw 7 and one of the worms 6 when the shielding component 8 is working. When the device is in use, under the control of the driving component 9, one of the worms 6 can be controlled to drive the worm gear 5 to rotate, and then the screw 7 can be controlled to move up to perform the gate opening operation. The driving component 9 can be driven by the driving motor 47 or by the rotating disk 51 to ensure the practicality of the driving component 9; and while the control screw 7 moves upward, the cleaning component 11 provided can ensure contact with the control screw 7, and then scrape off impurities and dust adhered to the lower end of the control screw 7, effectively preventing impurities from entering the interior of the housing 3, interfering with the cooperation between the control screw 7 and the turbine, increasing the friction between the worm gear 5 and the control screw 7, thereby reducing the wear on the worm gear 5 and the control screw 7, and effectively improving the service life of the control screw 7; and through The shielding component 8 is set to block the top of the control screw 7 to prevent rainwater from entering the shell 3 through the movable hole 12 of the cover body 4 and corroding the control screw 7; when the equipment is running, the driving component 9 controls the rotation of the worm gear 5 to drive the control screw 7 to move downward. When the gate is closed, the shielding component 8 is driven to move downward synchronously. In the process of the shielding component 8 moving down and resetting, the control component 20 can control the lubrication component 13 to work, and lubricate and maintain the control screw 7, worm gear 5 and two worms 6 in the shell 3, so that the various components are lubricated for a long time, to prevent the equipment from running at high temperature due to lack of lubricating oil, causing deformation of parts, or serious wear of the control screw 7, worm gear 5 and two worms 6 due to lack of lubricating oil; and the work of the control component 20 will be carried out synchronously with the gate closing operation, and there is no need for manual intervention in the work of the lubrication component 13, to avoid the situation where the staff forgets to spray lubricating oil.

[0047] Optionally, the lubrication assembly 13 includes a storage tank 14 fixed to the outer wall of the housing 3, a sealing cover 15 screwed onto the top of the storage tank 14, a piston 16 movably arranged in the sealing cover 15, a sliding rod 17 fixed to the upper surface of the piston 16 and slidably mounted on the sealing cover 15, a return spring 18 movably sleeved on the sliding rod 17 and fixedly connected between the piston 16 and the sealing cover 15, a limiting ring 19 fixed in the storage tank 14, a control member 20 mounted on the sliding rod 17 and the shielding assembly 8, a first one-way valve 21 connected to the lower end of the storage tank 14 through a pipeline, a first oil pipe 22 connected to the other end of the first one-way valve 21, a second oil pipe 23 connected to the first oil pipe 22, a plurality of nozzles 24 respectively connected to the first oil pipe 22 and the second oil pipe 23, a second one-way valve 25 connected to the storage tank 14, and an air intake pipe 26 connected to the other end of the second one-way valve 25;

[0048] The plurality of nozzles 24 on the first oil pipe 22 are all arranged at the meshing position between the worm wheel 5 and one of the worms 6;

[0049] The nozzle 24 on the second oil pipe 23 is set at the spiral connection between the control screw 7 and the worm gear 5. When in use, the control member 20 presses the slide rod 17 to drive the piston 16 to move downward. At this time, the return spring 18 will be stretched, and as the piston 16 moves, the lubricating oil in the storage tank 14 can be compressed into the first oil pipe 22 and the second oil pipe 23, and sprayed out through a plurality of nozzles 24, thereby lubricating the connection between the worm gear 5 and one of the worms 6 and the connection between the worm gear 5 and the control screw 7, and during the operation of the equipment, the lubricating oil is The screw 7, the worm wheel 5 and the two worms 6 are maintained to effectively improve the service life of the equipment. After the control part 20 releases the downward force on the slide rod 17, the piston 16 is controlled to reset under the elastic force of the reset spring 18. Under the control of the first one-way valve 21, the oil in the first oil pipe 22 and the second oil pipe 23 can be prevented from flowing back into the storage tank 14. With the cooperation of the air intake pipe 26 connected by the second one-way valve 25, the outside air can enter the storage tank 14, so that the piston 16 is smoothly reset, which is convenient for the next use of the lubrication component 13.

[0050] Optionally, the control member 20 includes a collar 27 fixedly sleeved on the slide rod 17, a control ring 28 fixed to the shielding assembly 8 and movably sleeved on the slide rod 17 and the collar 27, a plurality of movable grooves 29 in an annular array provided in the control ring 28, a plurality of pressure rods 30 movably mounted in the plurality of movable grooves 29, and a plurality of control springs 31 respectively disposed in the plurality of movable grooves 29;

[0051] One end of the control springs 31 is fixedly connected to the pressure rods 30 , and the other end of the control springs 31 is fixedly connected to the inner walls of the movable grooves 29 .

[0052] The upper and lower surfaces of the resisting ring 27 are both inclined surfaces. When the device controls the gate to be opened, the control screw 7 moves upward, and the control shielding assembly 8 moves upward synchronously, the control ring 28 moves upward and causes the plurality of pressure rods 30 to contact the lower surface of the resisting ring 27, while the piston 16 in the storage tank 14 is blocked by the sealing cover 15. As a result, during the upward movement of the control ring 28, the sliding rod 17 and the piston 16 cannot be driven to move upward synchronously by the resisting ring 27. Since the lower surface of the resisting ring 27 is an inclined surface, during the conflict between the plurality of pressure rods 30 and the conflicting ring, the plurality of pressure rods 30 will move in the plurality of movable grooves 29 and compress the plurality of control springs 31, so that the control ring 28 will separate from the sliding rod 17 during this movement. When the device controls the gate to be closed and the control screw 7 drives the shielding assembly 8 to move downward synchronously, the control ring 28 moves downward and This causes several pressure rods 30 to contact the upper surface of the resistance ring 27, thereby pressing the resistance ring to control the slide rod 17 to drive the piston 16 downward, so that the return spring 18 is stretched, and after the piston 16 contacts the limit ring 19, the piston 16 cannot move downward. Since the upper surface of the resistance ring 27 is a slope, during the conflict between the several pressure rods 30 and the resistance ring, the several pressure rods 30 will move in the several movable grooves 29 and compress the several control springs 31, so that the control ring 28 disengages from the slide rod 17 during this movement, releasing the force on the resistance ring 27. At this time, under the elastic force of the return spring 18, the piston 16 is reset, completing the use of the lubrication component 13. The drive of the lubrication component 13 depends on the normal operation of the equipment and does not require manual intervention, thereby avoiding the staff from forgetting to lubricate the equipment.

[0053] Optionally, the shielding assembly 8 includes a bearing seat 33 mounted on the upper end of the control screw 7, a shielding cover 32 fixed on the bearing seat 33, two guide rods 34 symmetrically fixed to the lower surface of the shielding cover 32, two limit blocks 35 symmetrically fixed to the housing 3, and two guide grooves 36 respectively provided on the two limit blocks 35;

[0054] The two guide rods 34 are respectively slidably inserted into the two guide grooves 36;

[0055] The control ring 28 is fixed on the shielding cover 32. The shielding cover 32 can effectively shield the top of the control screw 7, thereby preventing rainwater from entering the shell 3 and corroding the internal parts. With the cooperation of the two guide rods 34, the limit block 35 and the guide groove 36, the movement of the shielding cover 32 can be restricted to enable the device to work. When the control screw 7 moves upward, the shield will only move in the vertical direction and will not rotate with the control screw 7, thereby driving the control ring 28 to move in the vertical direction, facilitating the use of the control part 20 in the lubrication assembly 13.

[0056] Optionally, the stabilizing member 10 includes a stabilizing plate 37 fixed in the bracket 2 and a stabilizing column 38 installed on the upper surface of the stabilizing plate 37;

[0057] The stabilizing column 38 is threadedly connected to the control screw 7. The stabilizing plate 37 and the stabilizing column 38 can guide the movement direction of the control screw 7 to a certain extent. During the operation of the equipment, the overload of the equipment can be prevented, which may cause the control screw 7 to deviate and deform, thereby effectively improving the service life of the equipment.

[0058] Optionally, the cleaning assembly 11 includes a slide 41 provided on the stabilizing plate 37, a displacement seat 39 slidably mounted in the slide 41, a scraper 40 fixed to the bottom of the displacement seat 39, a threaded scraping groove 42 provided on the scraper 40 and threadedly matched with the control screw 7, an adjusting screw 43 threadedly mounted in the slide 41 and rotatably connected to the displacement seat 39, and the contact effect between the scraper 40 and the surface of the control screw 7 is ensured by the provision of the threaded scraping groove 42, thereby ensuring the smooth operation of the device. When the control screw 7 rotates and moves upward, the scraper 40 provided can scrape off impurities adhered to the lower end of the control screw 7 to prevent the impurities from entering the friction between the worm gear 5 and the control screw 7, causing wear to the control screw 7 and affecting the service life of the control screw 7; and when in use, the position of the control displacement seat 39 in the slide groove 41 can be controlled by rotating the adjustment screw 43, thereby controlling the contact effect between the scraper 40 and the control screw 7, which can ensure that the scraper 40 maintains contact with the control screw 7 and ensures the cleaning effect of the control screw 7.

[0059] Optionally, the lubrication assembly 13 also includes an oil inlet pipe 44 connected to the storage tank 14, an oil cap 45 threadedly mounted on the other end of the oil inlet pipe 44, and a transparent observation window 46 provided on the storage tank 14. When in use, the staff can observe the amount of lubricating oil in the storage tank 14 through the transparent observation window 46, which is convenient for the staff to replenish the lubricating oil in the storage tank 14 in time. When lubricating oil needs to be added, it is only necessary to rotate the oil cap 45 and remove it from the oil inlet pipe 44, and the lubricating oil can be replenished into the storage tank 14 through the oil inlet pipe 44, which is convenient to use.

[0060] Optionally, the drive assembly 9 includes a drive motor 47 mounted on the bracket 2, a first transmission wheel 48 fixed to the output end of the drive motor 47, a second transmission wheel 49 fixedly mounted on one of the worm gears 6, a transmission belt 50 sleeved on the first transmission wheel 48 and the second transmission wheel 49, a rotating disk 51 plugged into the other worm gear 6, and a hook 52 fixed to the bracket 2. When in use, the first transmission wheel 48 can be driven by the drive motor to rotate, and with the cooperation of the transmission belt 50, the second transmission wheel 49 can be controlled to rotate synchronously, and It drives one of the worms 6 to rotate, and then engages the transmission worm wheel 5, so that the device can work. The rotating disk 51 can be removed from the other worm 6 and placed on the hook 52 when the drive motor 47 is working, so as to avoid the rotating disk 51 being driven to rotate synchronously when the drive motor 47 controls the device to work, thereby affecting the work of the staff. When the drive motor 47 cannot be used, the rotating disk 51 can be plugged into the corresponding worm 6, and the rotating disk 51 can be rotated to control the rotation of the worm 6, engage the transmission worm wheel 5, and control the device to work, thereby ensuring the practicality of the device.

[0061] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A maintenance-free screw hoist, characterized in that: include: A base plate (1), a bracket (2) fixed on the base plate (1), a housing (3) mounted on the bracket (2), a cover (4) fixedly mounted on the top of the housing (3), a worm wheel (5) and two worms (6) rotatably mounted in the housing (3) and meshing with each other, a control screw (7) spirally mounted in the middle of the worm wheel (5), a shielding assembly (8) arranged on the housing (3) and the control screw (7), a driving assembly (9) mounted on the bracket (2) and the two worms (6), a fixing member (10) arranged in the bracket (2), a cleaning assembly (11) mounted on the fixing member (10), a movable hole (12) provided on the housing (3), the cover (4), the bracket (2) and the base plate (1), and a lubricating assembly (13) mounted on the housing (3) and the shielding assembly (8), wherein The shielding assembly (8) is suitable for shielding the top of the control screw (7) and moving synchronously with the movement of the control screw (7); The driving assembly (9) is suitable for controlling the rotation of the worm gear (5) under different circumstances; The stabilizing member (10) is suitable for improving the stability of the control screw (7) during operation; The cleaning component (11) is adapted to abut against the thread groove at the lower end of the control screw (7); The lubricating assembly (13) is suitable for synchronously spraying lubricating oil on the worm wheel (5), the control screw (7) and one of the worms (6) when the shielding assembly (8) is working; The lubricating assembly (13) includes a storage tank (14) fixed on the outer wall of the housing (3), a sealing cover (15) screwed on the top of the storage tank (14), a piston (16) movably arranged in the sealing cover (15), a slide rod (17) fixed on the upper surface of the piston (16) and slidably mounted on the sealing cover (15), a return spring (18) movably sleeved on the slide rod (17) and fixedly connected between the piston (16) and the sealing cover (15), a limiting ring (19) fixed in the storage tank (14), and an installation The control member (20) on the slide rod (17) and the shielding assembly (8) is connected to a first one-way valve (21) at the lower end of the storage tank (14) through a pipeline, a first oil pipe (22) connected to the other end of the first one-way valve (21), a second oil pipe (23) connected to the first oil pipe (22), a plurality of nozzles (24) respectively connected to the first oil pipe (22) and the second oil pipe (23), a second one-way valve (25) on the storage tank (14), and an air intake pipe (26) at the other end of the second one-way valve (25); The plurality of nozzles (24) on the first oil pipe (22) are all arranged at the meshing position between the worm wheel (5) and one of the worms (6); The nozzle (24) on the second oil pipe (23) is arranged at the spiral connection between the control screw (7) and the worm gear (5); The control member (20) includes a retaining ring (27) fixedly sleeved on the slide rod (17), a control ring (28) fixed on the shielding assembly (8) and movably sleeved on the slide rod (17) and the retaining ring (27), a plurality of movable grooves (29) arranged in an annular array in the control ring (28), a plurality of pressure rods (30) movably mounted in the plurality of movable grooves (29), and a plurality of control springs (31) respectively arranged in the plurality of movable grooves (29); One end of the plurality of control springs (31) is fixedly connected to the plurality of pressure rods (30), and the other end of the plurality of control springs (31) is fixedly connected to the inner walls of the plurality of movable grooves (29). The upper surface and the lower surface of the collar (27) are both inclined surfaces.

2. A maintenance-free screw hoist according to claim 1, characterized in that: The shielding assembly (8) includes a bearing seat (33) mounted on the upper end of the control screw (7), a shielding cover (32) fixed on the bearing seat (33), two guide rods (34) symmetrically fixed to the lower surface of the shielding cover (32), two limit blocks (35) symmetrically fixed to the housing (3), and two guide grooves (36) respectively provided on the two limit blocks (35); The two guide rods (34) are respectively fitted and slidably inserted into the two guide grooves (36); The control ring (28) is fixed on the shielding cover (32).

3. A maintenance-free screw hoist according to claim 1, characterized in that: The stabilizing member (10) includes a stabilizing plate (37) fixed in the bracket (2), and a stabilizing column (38) mounted on the upper surface of the stabilizing plate (37); The stabilizing column (38) is threadedly connected to the control screw (7).

4. A maintenance-free screw hoist as claimed in claim 3, characterized in that: The cleaning assembly (11) includes a slide groove (41) provided on the stabilizing plate (37), a displacement seat (39) slidably mounted in the slide groove (41), a scraper (40) fixed to the bottom of the displacement seat (39), a threaded scraper groove (42) provided on the scraper (40) and threadably engaged with the control screw (7), and an adjusting screw (43) threadedly mounted in the slide groove (41) and rotatably connected to the displacement seat (39).

5. A maintenance-free screw hoist according to claim 1, characterized in that: The lubrication assembly (13) further includes an oil inlet pipe (44) connected to the storage tank (14), an oil cap (45) threadedly mounted on the other end of the oil inlet pipe (44), and a transparent observation window (46) provided on the storage tank (14).

6. A maintenance-free screw hoist as claimed in claim 5, characterized in that: The driving assembly (9) includes a driving motor (47) mounted on the bracket (2), a first transmission wheel (48) fixed to the output end of the driving motor (47), a second transmission wheel (49) fixedly mounted on one of the worm gears (6), a transmission belt (50) sleeved on the first transmission wheel (48) and the second transmission wheel (49), a rotating disk (51) plugged into the other worm gear (6), and a hook (52) fixed to the bracket (2).

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