Durable ball screw system for environmental protection equipment

Abstract

The invention belongs to the technical field of environmental protection equipment, and particularly relates to a durable ball screw system for environmental protection equipment, which comprises an end plate and a sealing cavity formed in the end plate, and the sealing cavity is used for fixedly mounting an upper sealing assembly and a lower sealing assembly; the upper sealing assembly and the lower sealing assembly form a labyrinth structure and block large-particle pollutants, the second-stage sealing mechanism arranged in the sealing cavity blocks fine dust and liquid drops, and the first-stage sealing mechanism and the second-stage sealing mechanism are used for forming a two-stage cooperative sealing system. And a three-stage progressive protection structure of the ball screw system is formed by the ball screw shaft and an organ cover arranged outside the screw shaft. According to the ball screw two-stage cooperative sealing structure, the structure is compact, reliability is high, the service life is long, through the cooperative effect of non-contact sealing and contact sealing, classified filtering and blocking of pollutants of different sizes are achieved, and the durability of a ball screw system is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of environmental protection equipment, and particularly relates to a durable ball screw system for environmental protection equipment. BACKGROUND

[0002] With the rapid development of modern science and technology and engineering technology, environmental protection equipment (such as sewage treatment devices) is developing towards high efficiency, precision and long service life. The actuators in these devices often need to realize accurate linear motion and reliable positioning in harsh environments.

[0003] As a key transmission component for converting rotary motion into linear motion, the performance of the ball screw system directly affects the reliability, precision and service life of the entire environmental protection equipment Problems existing in the prior art: 1. Most general ball screw products on the market are prone to poor sealing performance in environmental protection equipment applications, which allows pollutants to easily enter the system, aggravates wear and tear, and thus reduces the service life of the ball screw system and increases maintenance costs and downtime risks.

[0004] 2. The existing ball screw usually adopts a single-layer contact type sealing ring or a simple dust cover, and the protection level is low, which is difficult to effectively block the long-term invasion of fine dust and liquid droplets.

[0005] 3. The sealing scheme adopted by most general ball screw products on the market in environmental protection equipment applications can block large particles, but still lacks protection against fine dust and splashed water. SUMMARY

[0006] The purpose of the present application is to provide a durable ball screw system for environmental protection equipment, which provides a compact, reliable and long-life ball screw two-stage collaborative sealing structure. The structure realizes the graded filtration and blocking of pollutants of different sizes through the collaborative action of non-contact and contact type sealing, and can form a three-stage progressive protection with the organ case outside the ball screw system, and improve the service life of the ball screw system.

[0007] The technical solutions adopted by the present application are as follows: A durable ball screw system for environmental protection equipment, comprising an end plate and a sealing cavity formed in the interior of the end plate, the sealing cavity being used for fixedly mounting an upper sealing assembly and a lower sealing assembly; The upper sealing assembly and the lower sealing assembly form a labyrinth structure and block large particle pollutants, the two-stage sealing mechanism arranged in the interior of the sealing cavity is used for blocking fine dust and liquid droplets, the first-stage sealing mechanism and the two-stage sealing mechanism form a two-stage collaborative sealing system, and the three-stage progressive protection structure of the ball screw system is formed with the organ case arranged outside the screw shaft. The lower sealing assembly is viscously coupled with the screw shaft by lubricating grease, so that the driving motor drives the screw shaft to drive the lower sealing assembly to rotate, and the lower sealing assembly drives the large-particle pollutants in the labyrinth structure to move centrifugally and throw the large-particle pollutants to the inner wall of the upper sealing assembly and make them settle.

[0008] The lower sealing assembly further comprises an extension ring fixedly installed at one end of the follower ring, and the outer part of the extension ring is rotatably installed with the static ring by a precision bearing, so that the extension ring drives the follower ring and the static ring to be rotatably installed. The outer surface of the follower ring is uniformly arranged with a plurality of protrusions, and the protrusions are arranged in a staggered manner with the grooves and are mutually embedded.

[0009] The grooves and the protrusions are both formed by concentric ring-shaped parts, and the gap between the grooves and the protrusions is used to form a zigzag and narrow gap channel. The upper sealing assembly further comprises a lubricating grease injection hole opened at one side of the static ring, which is used to inject lubricating grease into the gap between the grooves and the protrusions; and the upper sealing assembly and the lower sealing assembly are both made of stainless steel.

[0010] The secondary sealing mechanism comprises a lip-shaped sealing ring abutting against the inner side of the upper sealing assembly, and the inner surface of the lip-shaped sealing ring is provided with an inner dust lip and an outer dust lip, and the cross-sectional thickness of the inner dust lip is greater than that of the outer dust lip. One side of the lip-shaped sealing ring is further provided with an annular oil storage groove, which is used to store a small amount of lubricating grease and continuously cool the inner dust lip and the outer dust lip.

[0011] The lip-shaped sealing ring, the inner dust lip and the outer dust lip are integrally molded by special fluorine rubber; The inner dust lip and the outer dust lip are arranged in a stepped manner, the lip opening axial height of the inner dust lip is higher than that of the outer dust lip, and an annular grease storage groove is formed between them, the outer dust lip slightly contacts the surface of the screw shaft, which is used to scrape off large-particle dirt and guide the lubricating grease, and the inner dust lip is in interference fit with the surface of the screw shaft, which is used to provide the core radial sealing force.

[0012] The end plate is fixedly connected at both ends of the nut body, one side of the nut body is fixedly installed with a mounting assembly by a clamping seat, and both ends of the mounting assembly pass through the nut body and communicate with the large-curvature raceway groove.

[0013] The inside of the mounting assembly is provided with a sealing cavity between the large-curvature raceway groove, and the large-curvature raceway groove is also formed on the surface of the screw shaft, so that the sealing cavity moves in the raceway formed by the two sets of large-curvature raceway grooves and drives the nut body and the end plate to move axially, and the sealing cavity and the axial movement mechanism are both made of stainless steel.

[0014] The beneficial technical effects of the present application are: The two-section organ cover is fixedly installed on the two sides of the axial movement mechanism, so that the ball screw system is externally protected by the organ cover, and the first-stage sealing mechanism and the second-stage sealing mechanism installed inside the two ends of the axial movement mechanism can further provide double-stage collaborative sealing for the ball screw system, so that the three-layer progressive sealing structure formed by the organ cover, the first-stage sealing mechanism and the second-stage sealing mechanism can provide a three-layer deep protection system with clear levels and complementary functions for the ball screw system, which greatly improves the service life of the ball screw system under extremely harsh environmental conditions and improves the durability of the ball screw system.

[0015] The end plate is installed at the two ends of the axial movement mechanism, and the first-stage sealing mechanism and the second-stage sealing mechanism are installed in the sealing cavity inside the end plate, wherein the first-stage sealing mechanism is composed of an upper sealing assembly and a lower sealing assembly, the gap between the upper sealing assembly and the lower sealing assembly can form a tortuous and narrow gap channel, and the fluid mechanics principle is used to make the large particles of dust that attempt to invade lose kinetic energy, settle or collide and deflect in the channel that changes direction multiple times, and long-acting lubricating grease can be pre-filled in the gap to further enhance the blocking effect, effectively reduce the invasion of large particle pollutants, and improve the durability of the ball screw system.

[0016] The second-stage sealing mechanism is further provided inside the first-stage sealing mechanism, and the inner surface of the lip-shaped sealing ring of the second-stage sealing mechanism is provided with an inner dust lip and an outer dust lip, and the axial installation height of the inner dust lip is higher than that of the outer dust lip, so that the inner dust lip generates greater pretightening force on the screw shaft in a static state, and an annular grease storage area is naturally formed between the two lips, and when the ball screw system is running, the outer dust lip preliminarily scrapes and blocks the residual pollutants on the surface of the screw shaft, and uniformly applies lubricating grease on the surface of the screw shaft, and the inner dust lip serves as the final barrier to effectively seal fine dust and droplets with higher contact pressure, and prevents internal lubricating grease from leaking out, and through the design of one sparse and one blocked and ladder cooperation, the reliability and fault tolerance of the sealing are further improved, and the durability of the ball screw system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the axial movement mechanism of the present application; Figure 2is the schematic view of the installation structure of the primary sealing mechanism in the application; Figure 3 is the schematic view of the specific structure of the primary sealing mechanism in the application; Figure 4 is the schematic view of the section structure of the primary sealing mechanism in the application; Figure 5 is the main view of the structure of the upper and lower sealing assemblies in the application; Figure 6 is the schematic view of the structure of the installation structure of the axial movement mechanism in the application; Figure 5 is the enlarged schematic view of the structure at A in the application; Figure 7 is the schematic view of the section structure of the secondary sealing mechanism in the application; Figure 8 is the schematic view of the installation structure of the extension tooth in the application; Figure 9 is the perspective view of the overall installation structure in the application; Figure 10 is the schematic view of the installation structure of the axial movement mechanism in the application; Figure 11 is the schematic view of the section structure of the nut body in the application; Figure 12 is the schematic view of the installation assembly structure in the application; Figure 13 is the schematic view of the installation structure of the ball body and the large-curvature raceway groove in the application.

[0018] In the drawings, the components represented by the respective reference numerals are listed as follows: 1, base; 2, driving motor; 3, organ cover; 4, screw shaft; 5, axial movement mechanism; 51, end plate; 52, nut body; 53, installation assembly; 531, installation pipe; 532, through hole; 533, plug; 534, ball body; 54, sealing cavity; 55, clamping seat; 6, primary sealing mechanism; 61, upper sealing assembly; 611, static ring; 612, installation hole; 613, groove; 614, first extension tooth; 62, installation frame; 63, lower sealing assembly; 631, extension ring; 632, follower ring; 633, protrusion; 634, second extension tooth; 64, precision bearing; 7, secondary sealing mechanism; 71, lip-shaped sealing ring; 72, inner dust lip; 73, outer dust lip; 74, oil storage groove; 8, large-curvature raceway groove. DETAILED DESCRIPTION

[0019] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0020] like Figures 1-13 As shown, a durable ball screw system for environmental protection equipment includes an end plate 51 and a sealing cavity 54 formed inside the end plate 51, the sealing cavity 54 being used to fix and install an upper sealing assembly 61.

[0021] According to the above structure, the sealing cavity 54 is annularly concave, and the two concave rings form a trapezoidal structure, so that the secondary sealing mechanism 7 and the primary sealing mechanism 6 can be embedded in the end plate 51 from the inside to the outside through the sealing cavity 54. At the same time, the upper sealing component 61 of the primary sealing mechanism 6 has an outwardly extending mounting flange, so that the upper sealing component 61 can be fixedly installed with the sealing cavity 54 by a screw, thereby fixing the primary sealing mechanism 6 and the axial movement mechanism 5.

[0022] Furthermore, the secondary sealing mechanism 7 is located inside the primary sealing mechanism 6, while the primary sealing mechanism 6 and the lead screw shaft 4 adopt a non-contact seal, which can prevent large particulate pollutants from entering the interior of the axial motion mechanism 5. At the same time, the secondary sealing mechanism 7 and the lead screw shaft 4 adopt a contact seal, which can effectively block fine dust and droplets.

[0023] Please refer to the appendix for details. Figures 2 to 6 The primary sealing mechanism 6 mainly achieves sealing through the cooperation of the upper sealing component 61 and the lower sealing component 63. The upper sealing component 61 and the lower sealing component 63 can be used to form a labyrinth structure and to prevent large particulate pollutants from entering the interior of the axial movement mechanism 5. The primary sealing mechanism 6 and the secondary sealing mechanism 7 can be used to form a two-stage synergistic sealing system.

[0024] More specifically, the upper sealing assembly 61 includes a static ring 611 fixedly installed inside the sealing cavity 54, and a plurality of grooves 613 are evenly arranged inside the static ring 611. The outer surface of the follower ring 632 of the lower sealing assembly 63 is evenly arranged with a plurality of protrusions 633, and the plurality of protrusions 633 and the grooves 613 are arranged in a staggered manner.

[0025] Furthermore, the protrusions of the multiple protrusions 633 are inserted into the interior of the multiple grooves 613, so that the protrusions 633 and the grooves 613 fit together. The tooth tip of the protrusion 633 and the bottom of the groove 613 maintain a precise radial gap, preferably 0.1mm to 0.3mm. The side of the protrusion of the protrusion 633 and the side of the groove 613 also maintain a small axial gap. This axial gap is the same as the radial gap, thus forming a tortuous path like a "maze".

[0026] According to the above structure, since the middle axial gap and the radial gap are arranged between the upper sealing assembly 61 and the lower sealing assembly 63, and the grease injection hole penetrating the static ring 611 is arranged outside the static ring 611, the lubricating grease can be injected into the gap between the groove 613 and the protrusion 633, so as to fill the axial gap and the radial gap between the upper sealing assembly 61 and the lower sealing assembly 63, and the large-particle contaminants are blocked.

[0027] It should be noted that the static ring 611 adopts a two-semi-circular split structure, which can be directly sleeved outside the lower sealing assembly 63 during installation, and the two semi-circular static rings 611 are installed outside the lower sealing assembly 63 through the screw rod and the nut and the installation hole 612 arranged on the outer surface of the static ring 611, so that the lower sealing assembly 63 can be installed and fixed synchronously through the mounting frame 62 during the installation and fixation of the upper sealing assembly 61 and the end plate 51.

[0028] Referring to the accompanying drawings Figures 3 to 6 , Figure 9 and Figure 10 , the driving motor 2 is fixedly installed on the top of the base 1, and the lead screw shaft 4 is rotatably installed, the lead screw shaft 4 is driven to rotate in the axial movement mechanism 5 by the driving motor 2, and the axial movement mechanism 5 is driven to move axially, since the surface of the lead screw shaft 4 is coated with lubricating grease, and the lower sealing assembly 63 is viscously coupled with the lead screw shaft 4 through the lubricating grease.

[0029] According to the above structure, the lower sealing assembly 63 further comprises the extension ring 631 fixedly installed at one end of the follower ring 632, wherein the outer part of the extension ring 631 is rotatably installed with the static ring 611 through the precision bearing 64, and the extension ring 631 and the follower ring 632 are of an integrated structure, so that the extension ring 631 drives the follower ring 632 and the static ring 611 to be rotatably installed, since the follower ring 632 is viscously coupled with the lead screw shaft 4, the follower ring 632 can be driven to rotate synchronously by the lubricating grease under the rotation of the lead screw shaft 4.

[0030] Further, during the synchronous rotation of the follower ring 632 and the lead screw shaft 4, the rotation of the follower ring 632 will show the phenomenon of increasing rotation speed under the action of the lubricating grease, and finally the rotation speed of the follower ring 632 is approximately the same as that of the lead screw shaft 4.

[0031] Specifically, when the follower ring 632 rotates, the protrusion 633 at the top of the follower ring 632 will rotate in the groove 613, since the lubricating grease is also filled between the protrusion 633 and the groove 613, the shear force can be formed by the rotation of the protrusion 633 and the cooperation of the lubricating grease, and the centrifugal force can also be generated, so as to throw the large-particle contaminants in the labyrinth structure to the inner wall of the upper sealing assembly 61 and make them settle down, thereby improving the effect of blocking the large-particle contaminants.

[0032] In some other embodiments, very shallow helical grooves, grid-like dimples or spiral lines can be machined on the convex surface of the bump 633 and the inner wall of the groove 613, which can more effectively "pump" and "stir" the lubricating grease in the gap when rotating, forming a stronger hydrodynamic pressure effect and viscous resistance, thereby increasing the effective shear area and torque transmission capacity, especially better performance at low speed start.

[0033] More specifically, the lubricating grease filled between the upper sealing assembly 61 and the lower sealing assembly 63, and between the screw shaft 4 and the lower sealing assembly 63, under the shearing and stirring action of the follower ring 632, makes the lubricating grease always maintain uniform distribution and good fluidity, avoiding the hardening, cracking or segregation of the grease due to long-term static, while also avoiding the deposition and hardening into hard dirt.

[0034] Of course, since there is no metal contact between the screw shaft 4 and the primary sealing mechanism 6, the wear problem is fundamentally solved, and the service life is equivalent to that of the bearing and the lubricating grease, while the lubricating grease can also absorb small centering errors and vibrations, making the operation more stable and quiet, and in extreme cases, such as foreign matter jamming, viscous drive allows slipping, which can avoid damage to parts.

[0035] Among them, the lubricating grease consistency grade is preselected as NLGI 1 or 2, with moderate consistency, which can firmly adhere to the surface of the part to form a sealing layer, and will not cause too much resistance to the start of rotation of the follower ring 632, and the base oil viscosity at 40 degrees Celsius should be between 100 and 200 cSt, so as to ensure sufficient viscosity to generate the required viscous shear force to drive the lower sealing assembly 63, and to form an effective fluid barrier between the lower sealing assembly 63 and the upper sealing assembly 61.

[0036] It is worth noting that the upper sealing assembly 61, the lower sealing assembly 63, and the screw shaft 4 are all made of stainless steel material, and the surface is processed through a hardening process, specifically through a low-temperature ion nitriding technology to form a hard nitrogen layer with residual compressive stress on the surface of the part, with a depth of 0.1 mm and a surface hardness greater than or equal to 1000 HV, thereby improving the wear resistance and fatigue life of the system, while maintaining the corrosion resistance of the base body.

[0037] It is to be noted that the first extension tooth 614 is formed on the inner side of the groove 613, and the second extension tooth 634 is formed on the outer side of the protrusion 633, and the top surfaces of the first extension tooth 614 and the second extension tooth 634 are at the same level, so that no interference occurs when the upper sealing assembly 61 and the lower sealing assembly 63 are installed, and the shearing force between the upper sealing assembly 61 and the lower sealing assembly 63 is further improved, and the complexity of the labyrinth structure is improved, and the sealing effect is improved.

[0038] Referring to the drawings Figure 4 and Figure 7 The secondary sealing mechanism 7 is further arranged between the primary sealing mechanism 6 and the end plate 51, and the secondary sealing mechanism 7 comprises a lip seal 71 abutting the inner side of the upper sealing assembly 61, and the lower sealing assembly 63 is not in contact with the secondary sealing mechanism 7, so that the rotation of the lower sealing assembly 63 is not interfered by the lip seal 71.

[0039] Further, the inner surface of the lip seal 71 is provided with an inner dust lip 72 and an outer dust lip 73, and the cross-sectional thickness of the inner dust lip 72 is greater than that of the outer dust lip 73, and the inner dust lip 72 and the outer dust lip 73 are arranged in a stepped manner, and the lip height of the inner dust lip 72 is higher than that of the outer dust lip 73, and an annular grease storage groove is formed therebetween.

[0040] Further, the outer dust lip 73 is in slight contact with the surface of the screw shaft 4 for scraping off large particles of dirt and guiding the lubricating grease, and the inner dust lip 72 is in interference fit with the surface of the screw shaft 4 for providing a core radial sealing force, and an annular oil storage groove 74 is further formed on one side of the lip seal 71, and the oil storage groove 74 is used for storing a small amount of lubricating grease and continuously cooling the inner dust lip 72 and the outer dust lip 73.

[0041] It is to be noted that the lip seal 71, the inner dust lip 72 and the outer dust lip 73 are integrally molded by special fluorine rubber, so as to improve the overall sealing strength, and through the double-lip stepped design, the outer dust lip 73 can be in contact with the lubricating grease as a pilot protection, and the inner dust lip 72 is the main seal, and the division of labor is clear, and the cavity between the two lips also forms a micro-pressure buffer zone, which can balance the pressure fluctuation in the sealing cavity caused by temperature change or shaft movement, and avoid failure or excessive wear of single-lip seal due to excessive back pressure.

[0042] Specifically, the outer dustproof lip 73 is in slight contact with the screw shaft 4, and the interference amount is preferably 0.1mm to 0.2mm, while the inner dustproof lip 72 is higher than the outer dustproof lip 73 by preferably 0.5mm to 1mm, and the interference amount of the inner dustproof lip 72 with the screw shaft 4 should be designed as 0.4mm, so that the radial contact pressure generated is higher, which is the core sealing interface to block external water and dust.

[0043] More specifically, the buffer zone between the inner dustproof lip 72 and the outer dustproof lip 73 can prevent the inner dustproof lip 72 from spraying oil when the internal temperature of the device rises to generate positive pressure, while the double lips work together when there is high pressure water vapor impact from the outside, combined with the primary sealing mechanism 6, to more stably resolve the pressure and ensure that the protection level of the ball screw system is stable to reach IP65 or above.

[0044] Further referring to the accompanying drawings Figure 4 and Figure 10 The bearing seat is fixedly installed on the top of the base 1, so that the screw shaft 4 is fixedly installed with the base 1, and two sections of the organ case 3 are installed between the bearing seat and the two sides of the axial movement mechanism 5, so that the ball screw system can be externally covered and protected by the organ case 3, and the primary sealing mechanism 6 and the secondary sealing mechanism 7 arranged inside the axial movement mechanism 5 form a three-stage progressive protection structure of the ball screw system.

[0045] Further, the organ case 3 can block the dirtiest and heaviest pollutants outside the entire ball screw system, greatly reducing the working pressure of the internal two-stage sealing system, so that it mainly deals with the penetration of dust and moisture, which can further reduce the blockage of the labyrinth structure, and the heavy protection means that the accidental failure of a single component, such as a small hole in the screw shaft 4 or slight wear of the lip of the secondary sealing mechanism 7, will not immediately cause the sealing structure of the ball screw system to collapse, and the durability of the ball screw system is improved.

[0046] Referring to the accompanying drawings Figures 10 to 13 The end plate 51 is fixedly connected to the two ends of the nut body 52, and the mounting assembly 53 is fixedly installed on one side of the nut body 52 through the clamping seat 55. The two ends of the mounting assembly 53 pass through the nut body 52 and communicate with the large-curvature raceway groove 8, and the ball body 534 is filled in the mounting pipe 531 of the mounting assembly 53. The ball body 534 moves to the inside of the large-curvature raceway groove 8 through the mounting pipe 531, so that the axial movement mechanism 5 can be driven to move axially during the rotation of the large-curvature raceway groove 8.

[0047] Specifically, the mounting assembly 53 further comprises a through hole 532 formed on the surface of the mounting pipe 531, and a plug 533 is inserted into the through hole 532, and the plug 533 can be removed to fill the interior of the mounting pipe 531 with lubricating grease, so as to ensure the lubricity of the ball body 534 and reduce the wear of the ball body 534 between the screw shaft 4 and the axial movement mechanism 5.

[0048] More specifically, the mounting pipe 531 is fixedly installed on the end plate 51 through a clamping seat 55, and the two ends of the mounting pipe 531 are inserted into the nut body 52, so that the mounting pipe 531 can be detached from the surface of the nut body 52 by detaching the clamping seat 55, and the worn ball body 534 can be replaced.

[0049] It should be noted that the large-curvature raceway groove 8 formed on the surface of the screw shaft 4 and the interior of the nut body 52 is replaced by a high-order curve instead of a traditional circular interpolation theory line, so as to reduce the contact stress of the ball body 534, reduce friction and wear, improve transmission efficiency, and further improve the durability of the ball screw system.

[0050] The working principle of the present application is as follows: by installing the axial movement mechanism 5 on the outer surface of the screw shaft 4, and installing the two groups of secondary sealing mechanisms 7 in the sealing cavity 54 of the axial movement mechanism 5 through the two ends of the screw shaft 4, the lower sealing assembly 63 of the two groups of primary sealing mechanisms 6 is passed through the outside of the screw shaft 4 and moved to the two ends of the axial movement mechanism 5, the upper sealing assembly 61 is installed on the outside of the lower sealing assembly 63 through the screw and nut, and the upper sealing assembly 61 and the lower sealing assembly 63 can form a labyrinth sealing structure through their own structural characteristics, when the primary sealing mechanism 6 is assembled, the primary sealing mechanism 6 is moved to the inside of the sealing cavity 54, the upper sealing assembly 61 abuts against the secondary sealing mechanism 7, and the primary sealing mechanism 6 is fixedly installed on the axial movement mechanism 5 through bolts, in use, the lower sealing assembly 63 can rotate in the interior of the upper sealing assembly 61 due to the effect of lubricating grease, the lubricating grease in the sealing structure between the two flows, and the invading pollutants are blocked and settled, the secondary sealing mechanism 7 can effectively block fine dust and liquid droplets, the cooperation of the primary sealing mechanism 6 and the secondary sealing mechanism 7 realizes the protection level of IP65 and above, ensures that the ball screw system can operate reliably for a long time under typical working conditions of environmental protection equipment, and cooperates with the organ case 3 outside the ball screw system, further improves the front sealing effect, and improves the durability of the ball screw system.

[0051] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to the conventional means in the art, unless specifically described and limited.

Claims

1. A durable ball screw system for environmental protection equipment, characterized in that, include: End plate (51), and sealing cavity (54) opened inside the end plate (51), the sealing cavity (54) being used to fix the upper sealing assembly (61) and the lower sealing assembly (63). The upper sealing assembly (61) and the lower sealing assembly (63) form a labyrinth structure and block large particulate pollutants. The secondary sealing mechanism (7) inside the sealing cavity (54) is used to block fine dust and droplets. The primary sealing mechanism (6) and the secondary sealing mechanism (7) form a two-stage synergistic sealing system and together with the bellows cover (3) set outside the lead screw shaft (4), form a three-stage progressive protection structure for the ball screw system. The lower sealing assembly (63) is viscously coupled to the lead screw shaft (4) through grease, so that the drive motor (2) drives the lead screw shaft (4) to rotate the lower sealing assembly (63), and the lower sealing assembly (63) causes the large particulate pollutants in the labyrinth structure to move centrifugally, and throws the large particulate pollutants toward the inner wall of the upper sealing assembly (61) and settles.

2. The durable ball screw system for environmental protection equipment according to claim 1, characterized in that: The sealing cavity (54) has a trapezoidal structure, so that the secondary sealing mechanism (7) and the primary sealing mechanism (6) are embedded inside the sealing cavity (54) from the inside out, and the secondary sealing mechanism (7) is located inside the primary sealing mechanism (6).

3. The durable ball screw system for environmental protection equipment according to claim 1, characterized in that: The upper sealing assembly (61) has an outwardly extending mounting flange on its outer side, so that the upper sealing assembly (61) is fixedly installed to the sealing cavity (54) by means of a screw. The mounting bracket (62) is fixedly installed to the mounting flange by driving the extension ring (631) through the precision bearing (64).

4. A durable ball screw system for environmental protection equipment according to claim 3, characterized in that: The upper sealing assembly (61) includes a static ring (611) fixedly installed inside the sealing cavity (54). The static ring (611) is composed of two half-ring structures, and the outer surface of the static ring (611) is provided with mounting holes (612), and the static ring (611) is formed by screws and nuts. The static ring (611) has a plurality of grooves (613) evenly arranged inside, and the plurality of grooves (613) are viscously coupled to the lower sealing assembly (63) through grease.

5. A durable ball screw system for environmental protection equipment according to claim 4, characterized in that: The lower sealing assembly (63) also includes an extension ring (631) fixedly installed at one end of the follower ring (632). The outside of the extension ring (631) is rotatably installed with the static ring (611) through a precision bearing (64), so that the extension ring (631) drives the follower ring (632) and the static ring (611) to rotate and install. The outer surface of the follower ring (632) is evenly distributed with a plurality of protrusions (633), which are staggered with the grooves (613) and interlock with each other.

6. The durable ball screw system for environmental protection equipment according to any one of claims 3-5, characterized in that: The groove (613) and the protrusion (633) are both formed by concentric rings, and the gap between the groove (613) and the protrusion (633) is used to form a tortuous and narrow gap channel; The upper sealing assembly (61) also includes a grease injection hole on one side of the static ring (611) for injecting grease into the gap between the groove (613) and the protrusion (633); both the upper sealing assembly (61) and the lower sealing assembly (63) are made of stainless steel.

7. A durable ball screw system for environmental protection equipment according to claim 2, characterized in that: The secondary sealing mechanism (7) includes a lip seal ring (71) that abuts against the inner side of the upper sealing component (61). The inner surface of the lip seal ring (71) is provided with an inner dustproof lip (72) and an outer dustproof lip (73), and the cross-sectional thickness of the inner dustproof lip (72) is greater than the cross-sectional thickness of the outer dustproof lip (73). The lip seal (71) also has an annular oil reservoir (74) on one side. The oil reservoir (74) is used to store a small amount of grease and to continuously cool the inner dust lip (72) and the outer dust lip (73).

8. A durable ball screw system for environmental protection equipment according to claim 7, characterized in that: The lip seal (71), inner dustproof lip (72) and outer dustproof lip (73) are integrally molded using special fluororubber; The inner dustproof lip (72) and the outer dustproof lip (73) are arranged in a stepped manner. The axial height of the lip opening of the inner dustproof lip (72) is higher than that of the lip opening of the outer dustproof lip (73), and an annular grease reservoir is formed between them. The outer dustproof lip (73) is in slight contact with the surface of the lead screw shaft (4) to scrape off large particles of dirt and guide the grease. The inner dustproof lip (72) is in an interference fit with the surface of the lead screw shaft (4) to provide the core radial sealing force.

9. A durable ball screw system for environmental protection equipment according to claim 1, characterized in that: The end plate (51) is fixedly connected to both ends of the nut body (52). An installation component (53) is fixedly installed on one side of the nut body (52) through a bracket (55). Both ends of the installation component (53) pass through the nut body (52) and communicate with the large curvature raceway groove (8).

10. A durable ball screw system for environmental protection equipment according to claim 9, characterized in that: A sealing cavity (54) is provided between the interior of the mounting assembly (53) and the large curvature raceway groove (8). The large curvature raceway groove (8) is also opened on the surface of the lead screw shaft (4), so that the sealing cavity (54) moves in the raceway formed by the two sets of large curvature raceway grooves (8) and drives the nut body (52) and end plate (51) to move axially. The sealing cavity (54) and the axial movement mechanism (5) are both made of stainless steel.

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