Lead screw nut structure and machining equipment with same

Abstract

The utility model provides a kind of screw nut structure and the processing equipment with it, screw nut structure includes: nut body, oil inlet is provided on the end face of nut body, installation cavity is provided in nut body;Lubricating oil channel is set in nut body, to deliver lubricating oil to predetermined lubricating position;Power component, at least part of power component is set in installation cavity, power component includes rotating body and piston component, rotating body has accommodating cavity, at least part of piston component is set in accommodating cavity, and piston component is movably set relative to rotating body, piston component and rotating body between have pressure cavity.The present application solves the problem of unstable oil supply caused by external quantitative lubricating system in the prior art, and low integration.

Description

Technical Field

[0001] This utility model relates to the field of lead screw nut lubrication technology, and more specifically, to a lead screw nut structure and processing equipment having the same. Background Technology

[0002] As a core component of precision transmission systems, the dynamic accuracy and service life of ball screw assemblies directly determine the machining quality and reliability of high-end equipment such as CNC machine tools. Sufficient and precise lubrication control is a crucial prerequisite for ensuring the performance of the ball screw assembly. Insufficient lubrication leads to frictional heat between the screw and nut, causing significant axial thermal deformation, resulting in loss of repeatability and ultimately causing the scrapping of a batch of workpieces. Simultaneously, excessively high local temperatures accelerate the plastic deformation of the angular contact bearings within the support housing and cage breakage. More seriously, microscopic adhesive wear under boundary lubrication conditions continuously damages the integrity of the raceway surface. When the accumulated wear exceeds a certain level, it not only causes vibration and abnormal noise but also leads to a decrease in the rigidity of the transmission system and permanent precision failure, forcing the entire ball screw transmission mechanism to be scrapped.

[0003] The precision of metered lubrication has a dual significance in this scenario: insufficient oil supply prevents the formation of an effective oil film between the rolling elements and the raceway, drastically exacerbating the aforementioned problems; conversely, excessive oil supply allows excess lubricant to penetrate the seal lip, causing oil pressure penetration, seal failure, and inducing swelling and deformation of the dust cover. A more insidious risk lies in the fact that residual oil is flung away from the lubrication points during high-speed operation, creating oil mist that contaminates the precision machining environment and increases lubricant consumption costs.

[0004] The current mainstream solution in the CNC machine tool industry relies on an external quantitative lubrication system, which supplies oil to multiple lubrication points through a centralized oil pump and a quantitative distributor. This system has the following drawbacks:

[0005] 1. Conflict between space and reliability: In conventional solutions, every additional meter of pipeline leads to a pressure loss of nearly 0.2 MPa. To ensure the pressure at the end, the output of the pump station needs to be increased, which exacerbates the risk of leakage at high-pressure pipeline joints.

[0006] 2. There is a blind spot in lubrication monitoring: the metering valve only controls the output and cannot sense the actual oil pressure at the lubrication point (such as oil pressure loss due to blockage), and the system has no fault feedback capability;

[0007] 3. Delay in dynamic adjustment of lubrication parameters: Adjusting the oil supply parameters requires manual intervention to adjust the pump oil frequency or replace the metering valve, which cannot quickly adapt to the lubrication needs of changing operating conditions;

[0008] 4. Low integration: Existing lubrication systems all require additional pump stations, pipelines, metering valves and connectors, resulting in high installation time and requiring the entire machine to be shut down and the protective cover to be removed during maintenance. Utility Model Content

[0009] The main objective of this invention is to provide a lead screw nut structure and processing equipment thereof, in order to solve the problems of unstable oil supply and low integration caused by the external quantitative lubrication system in the prior art.

[0010] To achieve the above objectives, according to one aspect of the present invention, a lead screw nut structure is provided, comprising: a nut body, an oil inlet provided on the end face of the nut body, and an installation cavity provided within the nut body; a lubricating oil passage disposed within the nut body for delivering lubricating oil to a predetermined lubrication position; and a power assembly, at least a portion of which is disposed within the installation cavity. The power assembly includes a rotating body and a piston component. The rotating body has a receiving cavity, at least a portion of which is disposed within the receiving cavity, and the piston component is movably disposed relative to the rotating body. A pressure chamber is provided between the piston component and the rotating body. When the rotating body rotates to a first position, the pressure chamber communicates with the oil inlet, and the piston component moves in a first direction to draw oil into the pressure chamber. When the rotating body rotates to a second position, the pressure chamber communicates with the lubricating oil passage, and the piston component moves in a second direction to push oil into the lubricating oil passage.

[0011] Furthermore, a first auxiliary oil passage is provided in the nut body, which is connected to the oil inlet and the lubricating oil passage respectively, and the first auxiliary oil passage extends along the axial direction of the nut body; a protrusion is also provided on the nut body, which protrudes relative to the end face of the nut body, and at least a part of the first auxiliary oil passage is located on the protrusion.

[0012] Furthermore, a recess is provided on the circumferential side of the nut body, the recess being recessed from the circumferential side toward the center of the nut body, and the recess being located on the side of the protrusion; a second auxiliary oil passage is also provided in the nut body, the second auxiliary oil passage being connected to the lubricating oil passage, and the second auxiliary oil passage extending to the side wall surface of the recess.

[0013] Furthermore, the power assembly also includes an angle disk, which is disposed in the mounting cavity. One end of the angle disk is movably connected to the inner wall of the mounting cavity, and the other end is connected to the piston component. The rotation axis of the angle disk is set at an angle with the rotation axis of the rotating body, so that during the rotation of the rotating body, the piston component is driven to move in the first direction or the second direction by the angle disk.

[0014] Furthermore, the piston assembly has a connector at its end, at least a portion of which is a spherical structure; the angle plate has an adapter, at least a portion of which is snapped into the adapter, so that the angle plate is pivotally connected to the piston assembly.

[0015] Furthermore, there are multiple receiving cavities, which are arranged sequentially along the rotation axis of the rotating body. There are multiple piston components, which are arranged one-to-one with the multiple receiving cavities. Angle disks are connected to each piston component respectively.

[0016] Furthermore, the power assembly also includes: a partition component disposed within the mounting cavity, wherein the partition component is provided with a first connecting channel and a second connecting channel, the first connecting channel being connected to the oil inlet and the second connecting channel being connected to the lubricating oil passage; wherein, when the rotating body rotates to the first position, the pressure chamber is connected to the oil inlet through the first connecting channel, and when the rotating body rotates to the second position, the pressure chamber is connected to the lubricating oil passage through the second connecting channel.

[0017] Furthermore, the lead screw nut structure also includes a pressure detection component, which is disposed on the nut body, with at least a portion of the pressure detection component extending into the lubricating oil passage to detect the oil pressure in the lubricating oil passage.

[0018] Furthermore, the power assembly also includes a drive component, which is mounted on the nut body and has a drive shaft that is driven to rotate the rotating body.

[0019] According to another aspect of the present invention, a processing device is provided, including a lead screw and nut structure and a lead screw, wherein the lead screw and nut structure is threadedly connected to the lead screw, and the lead screw and nut structure is the lead screw and nut structure described above.

[0020] The technical solution of this utility model includes an oil inlet on the end face of the nut body for the input of lubricating oil. The nut body also has a dedicated mounting cavity, specially designed to accommodate the power assembly. The power assembly, which is crucial for achieving metered lubrication, comprises a rotating body and a piston component.

[0021] The rotating body has an internal cavity into which a portion of the piston assembly is embedded, allowing the piston assembly to move relative to the rotating body. This structural design creates a variable-volume pressure chamber between the piston assembly and the rotating body. By controlling the rotation of the rotating body, the connection between the pressure chamber and the outside can be cleverly switched, enabling the intake and delivery of oil. Specifically, when the rotating body rotates to the first position, the pressure chamber is connected to the oil inlet. At this time, the piston assembly moves in the first direction, generating a negative pressure effect that draws oil from the oil inlet into the pressure chamber. Then, when the rotating body further rotates to the second position, the pressure chamber connects to the lubrication channel. At this time, the piston assembly moves in the opposite second direction, increasing the pressure within the pressure chamber, thereby pushing the oil into the lubrication channel. Finally, the oil is guided to the predetermined lubrication position of the lead screw nut.

[0022] By cooperating with the piston component and the rotating body, precise oil intake and output can be achieved at different stages of rotation, avoiding the problems of over-lubrication and under-lubrication in traditional lubrication systems, thus improving the accuracy and efficiency of lubrication. The power component is integrated into the mounting cavity of the nut body, eliminating the need for an additional pump station and complex piping system, resulting in a more compact overall structure that facilitates installation and maintenance, making it particularly suitable for precision equipment with limited space. This application controls the angle of the rotating body to ensure that the pressure chamber is connected to the oil inlet and lubrication passage at appropriate positions, thereby reducing the possibility of lubrication failure and enhancing the overall reliability of the system. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0024] Figure 1 A first-view structural schematic diagram of the lead screw nut structure according to the present invention is shown.

[0025] Figure 2 A second-view structural schematic diagram of the lead screw nut structure according to the present invention is shown;

[0026] Figure 3 A front view of the lead screw nut structure according to the present invention is shown;

[0027] Figure 4 A side view of the lead screw nut structure according to the present invention is shown;

[0028] Figure 5 A top view of the lead screw nut structure according to the present invention is shown;

[0029] Figure 6 A first-view sectional view of the lead screw nut structure according to the present invention is shown;

[0030] Figure 7 A second-view sectional view of the lead screw nut structure according to the present invention is shown;

[0031] Figure 8 A third-view sectional view of the lead screw nut structure according to the present invention is shown;

[0032] Figure 9 A fourth-angle sectional view of the lead screw nut structure according to the present invention is shown;

[0033] Figure 10 A first-view sectional view of the power component in the lead screw nut structure according to the present invention is shown;

[0034] Figure 11 A second-view sectional view of the power component in the lead screw nut structure according to the present invention is shown;

[0035] Figure 12 A flow chart illustrating the lubrication control process of the lead screw nut structure according to this invention is shown.

[0036] The above figures include the following reference numerals:

[0037] 100. Nut body; 101. Oil inlet; 110. Mounting cavity; 120. First auxiliary oil passage; 130. Protrusion; 140. Recess; 150. Second auxiliary oil passage; 160. Lead screw nut end cap; 200. Lubricating oil passage;

[0038] 300. Power assembly; 310. Rotating body; 320. Piston assembly; 311. Receiving cavity; 330. Pressure chamber; 340. Angle plate; 321. Connector; 322. Piston end cap; 341. Adapter; 350. Separating component; 351. First connecting channel; 352. Second connecting channel; 360. Drive assembly; 361. Drive shaft; 362. Coupling; 363. Motor mounting base; 364. Ball bearing inner ring clamping nut; 365. Ball bearing; 366. Ball bearing outer ring locating block; 367. Ball bearing inner ring locating block; 371. Cylindrical roller bearing housing adapter sleeve; 372. Positioning transition sleeve; 373. Cylindrical roller bearing; 400. Pressure detection component. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Please refer to Figures 1 to 11This application provides a lead screw nut structure, including: a nut body 100, with an oil inlet 101 provided on the end face of the nut body 100, and an installation cavity 110 provided inside the nut body 100; a lubricating oil passage 200, disposed inside the nut body 100 to deliver lubricating oil to a predetermined lubrication position; and a power assembly 300, at least a portion of which is disposed within the installation cavity 110. The power assembly 300 includes a rotating body 310 and a piston component 320. The rotating body 310 has a receiving cavity 311, and at least a portion of the piston component 320 is disposed within the installation cavity 110. Within the receiving cavity 311, and with the piston component 320 movably disposed relative to the rotating body 310, a pressure chamber 330 is provided between the piston component 320 and the rotating body 310. When the rotating body 310 rotates to the first position, the pressure chamber 330 communicates with the oil inlet 101, and the piston component 320 moves in the first direction to draw oil into the pressure chamber 330. When the rotating body 310 rotates to the second position, the pressure chamber 330 communicates with the lubricating oil passage 200, and the piston component 320 moves in the second direction to push oil into the lubricating oil passage 200.

[0041] According to the lead screw nut structure provided in this application, an oil inlet 101 is provided on the end face of the nut body 100 for the input of lubricating oil. The nut body also has a dedicated mounting cavity 110, which is specially designed to accommodate the power assembly 300. The power assembly 300 is key to achieving metered lubrication; it includes a rotating body 310 and a piston component 320.

[0042] The rotating body 310 has an internal receiving cavity 311 into which a portion of the piston component 320 is embedded, and the piston component 320 can move relative to the rotating body 310 within the receiving cavity 311. This structural design creates a variable-volume pressure chamber 330 between the piston component 320 and the rotating body 310. By controlling the rotation of the rotating body 310, the connection between the pressure chamber 330 and the outside can be cleverly switched, realizing the intake and delivery of oil.

[0043] Specifically, when the rotating body 310 rotates to the first position, the pressure chamber 330 is connected to the oil inlet 101. At this time, the piston component 320 moves in the first direction, generating a negative pressure effect, which draws the oil from the oil inlet 101 into the pressure chamber 330. Then, when the rotating body 310 rotates further to the second position, the pressure chamber 330 is connected to the lubrication passage 200. At this time, the piston component 320 moves in the opposite second direction, increasing the pressure in the pressure chamber 330, thereby pushing the oil into the lubrication passage 200. Finally, the oil is guided to the predetermined lubrication position of the lead screw nut.

[0044] The predetermined lubrication location is either the threaded hole of the lead screw nut or the balls inside the lead screw nut (not shown in the figure).

[0045] Through the cooperation between the piston component 320 and the rotating body 310, precise oil intake and output can be achieved at different stages of rotation, avoiding the problems of over-lubrication and under-lubrication in traditional lubrication systems, and improving the accuracy and efficiency of lubrication. The power component 300 is integrated into the mounting cavity 110 of the nut body 100, eliminating the need for an additional pump station and complex piping system, making the overall structure more compact, easy to install and maintain, and especially suitable for precision equipment with limited space.

[0046] This application controls the angle of the rotating body 310 to ensure that the pressure chamber 330 is connected to the oil inlet 101 and the lubrication channel 200 in the appropriate position, thereby reducing the possibility of lubrication failure and enhancing the working reliability of the entire system.

[0047] Specifically, the nut body 100 is also provided with a first auxiliary oil passage 120, which is connected to the oil inlet 101 and the lubricating oil passage 200 respectively. The first auxiliary oil passage 120 extends along the axial direction of the nut body 100. The nut body 100 is also provided with a protrusion 130, which protrudes relative to the end face of the nut body 100. At least a portion of the first auxiliary oil passage 120 is located on the protrusion 130.

[0048] A first auxiliary oil passage 120 is added inside the nut body 100. This passage is connected to the oil inlet 101 and the lubrication passage 200, meaning it acts as an intermediary, guiding the lubricating oil entering from the oil inlet 101 to the main lubrication passage 200, thereby achieving directional delivery of the lubricating oil. A unique feature of this design is that the first auxiliary oil passage 120 extends along the axial direction of the nut body 100, rather than radially or laterally. This layout helps reduce the number of bends in the oil passage, lowers fluid resistance, and ensures that the lubricating oil can smoothly reach the target lubrication area with minimal pressure loss.

[0049] A protrusion 130 is provided on the end face of the nut body 100. This protrusion 130 protrudes from the end face of the nut body 100, serving not only as structural reinforcement but also providing additional space to accommodate part or all of the structure of the first auxiliary oil passage 120. By arranging the first auxiliary oil passage 120 inside or on the surface of the protrusion 130, a more complex oil circuit design can be achieved without significantly increasing the overall volume, while also facilitating subsequent maintenance and repair, as the protrusion is relatively obvious and easily accessible.

[0050] Since the first auxiliary oil passage 120 extends along the axial direction of the nut body 100, this greatly reduces the fluid resistance of the lubricating oil during the delivery process. At the same time, it facilitates the machining of the lubricating oil passage 200, ensuring that the lubricating oil can reach the lubrication point with high efficiency and low pressure loss, thereby improving lubrication efficiency and reducing energy consumption.

[0051] In the specific implementation process, such as Figure 1 and Figure 2 As shown, a recessed portion 140 is provided on the circumferential side of the nut body 100. The recessed portion 140 is recessed from the circumferential side toward the center of the nut body 100 and is located on the side of the protrusion 130. A second auxiliary oil passage 150 is also provided inside the nut body 100. The second auxiliary oil passage 150 is connected to the lubricating oil passage 200 and extends to the side wall of the recessed portion 140.

[0052] The recess 140 is a special structure provided on the circumferential side of the nut body 100. Its shape is recessed towards the center of the nut body 100, and its position is chosen to be on the side of the protrusion 130. This design is not only aesthetically pleasing, but more importantly, it provides extra space for machining the second auxiliary oil passage 150, making the lubricating oil transport path more diversified and controllable.

[0053] The second auxiliary oil passage 150 is connected to the main lubrication oil passage 200. It extends along the interior of the nut body 100 and finally reaches the side wall of the recess 140. This design makes the second auxiliary oil passage 150 a supplementary lubrication path. It can work with the first auxiliary oil passage 120 to flexibly adjust the delivery volume and direction of lubricating oil according to different working conditions and needs, so as to achieve more precise lubrication control.

[0054] In practical applications, when the lead screw nut is subjected to high loads or operates at high speeds, the demand for lubrication may increase. At this time, the second auxiliary oil passage 150 can directly deliver more lubricating oil to this area through the side wall opening of the recess 140, providing immediate lubrication replenishment. The rotating body 310 and piston component 320 in the power assembly 300 can control the amount of lubricating oil delivered by adjusting their rotation angle and speed, thereby ensuring that adequate lubrication is provided under any operating conditions.

[0055] In addition, the recessed portion 140 facilitates the machining of the second auxiliary oil passage 150.

[0056] In this application, as Figure 10 and Figure 11As shown, the power assembly 300 also includes an angle disk 340, which is disposed in the mounting cavity 110. One end of the angle disk 340 is movably connected to the inner wall of the mounting cavity 110, and the other end is connected to the piston component 320. The rotation axis of the angle disk 340 is set at an angle with the rotation axis of the rotating body 310, so that during the rotation of the rotating body 310, the piston component 320 is driven to move in the first direction or the second direction by the angle disk 340.

[0057] One end of the angle disk 340 is movably connected to the inner wall of the mounting cavity 110, allowing it to rotate freely. Specifically, a mating groove is provided on the inner wall of the mounting cavity 110, and the groove wall is spherical. A spherical body is also provided at the end of the angle disk 340, at least part of which is located within the mating groove and pivotally connected to its wall. A connecting shaft extends from the spherical body and is rotatably connected to the groove wall, allowing the angle disk 340 to rotate around the connecting shaft. The axis of the connecting shaft is the rotation axis of the angle disk 340. The other end of the angle disk 340 is connected to the piston component 320. When the rotating body 310 rotates, it drives the angle disk 340 connected to it to rotate. This rotational motion is converted into linear motion of the piston component 320 through the connection between the angle disk 340 and the piston component 320. Specifically, by setting the axis of the angle disk 340 at an angle to the axis of the rotating body 310, during the rotation of the angle disk 340, the change in the horizontal distance between the end face of the angle disk 340 facing the rotating body 310 and the rotating body 310 can drive the piston component 320 to reciprocate between the first direction and the second direction. These two directions are usually opposite to each other, such as "push" and "pull back".

[0058] When the rotating body 310 rotates to the first position, the piston component 320 is driven by the angled plate 340 to move in the first direction. At this time, the pressure chamber 330 is connected to the oil inlet 101, and the movement of the piston component 320 generates suction, drawing oil into the pressure chamber 330. Subsequently, when the rotating body 310 turns to the second position, the piston component 320 moves in the opposite second direction under the action of the angled plate 340. At this time, the pressure chamber 330 is connected to the lubrication oil passage 200, and the pushing of the piston component 320 pushes the oil into the lubrication oil passage 200, ultimately delivering it to the predetermined lubrication position.

[0059] To facilitate the connection between the piston component 320 and the angle plate 340, a connector 321 is provided at the end of the piston component 320, and at least a portion of the connector 321 is a spherical structure; an adapter 341 is provided on the angle plate 340, and at least a portion of the spherical structure is snapped into the adapter 341 so that the angle plate 340 and the piston component 320 are pivotally connected.

[0060] Specifically, the piston component 320 is equipped with a ball-shaped connector 321 at its end. This design gives the connector 321 a degree of freedom in multiple directions, allowing the piston component 320 to move more flexibly relative to the rotating body 310. A corresponding adapter 341 is provided on the angle plate 340. This adapter has a groove or snap-fit ​​structure designed to fit the ball-shaped connector 321. Thus, when at least a portion of the connector 321 is engaged with the adapter 341, a stable pivot connection point is formed.

[0061] This pivoting connection mechanism allows the piston component 320 to maintain a stable and precise relative motion with the angle disk 340, regardless of its angle, under the push of the rotating body 310. When the rotating body 310 rotates to a specific position, the piston component 320 can move along a set direction, effectively changing the volume of the pressure chamber 330, thereby achieving the intake and delivery of lubricating oil. In addition, the pivoting connection can also absorb some minor mechanical deviations or vibrations, protecting the piston component 320 from damage and ensuring that the lubrication system can operate stably under various operating conditions.

[0062] This connection method allows the piston component 320 to flexibly adjust its posture when performing lubrication tasks, even in the face of changes in external load or mechanical vibration, ensuring synchronous movement with the rotating body 310 and improving the overall adaptability and stability of the system.

[0063] There are multiple receiving cavities 311, which are arranged sequentially along the rotation axis of the rotating body 310. There are multiple piston components 320, which are arranged one-to-one with the multiple receiving cavities 311. Angle disk 340 is connected to each piston component 320 respectively.

[0064] Each receiving cavity 311 is matched with a piston component 320 to form a set of oil pumping units. This means that the rotating body 310 has an equal number of piston components 320, and each pair of piston components 320 combined with the receiving cavity 311 constitutes an independent oil pumping mechanism. This design allows for simultaneous or sequential oil suction and oil pressure actions in different receiving cavities 311, realizing continuous delivery and precise metering of lubricating oil.

[0065] The design of multiple oil pump units enables the lead screw and nut structure to withstand higher processing speeds and loads. This is because more oil pump units provide a larger oil flow, which promptly replenishes the heat generated by high friction, protects the lead screw and nut from overheating damage, thereby extending the service life of the equipment and improving production efficiency.

[0066] In a specific implementation, the power assembly 300 further includes: a partition component 350 disposed within the mounting cavity 110, wherein the partition component 350 is provided with a first connecting channel 351 and a second connecting channel 352, the first connecting channel 351 being connected to the oil inlet 101 and the second connecting channel 352 being connected to the lubricating oil passage 200; wherein, when the rotating body 310 rotates to the first position, the pressure chamber 330 is connected to the oil inlet 101 through the first connecting channel 351, and when the rotating body 310 rotates to the second position, the pressure chamber 330 is connected to the lubricating oil passage 200 through the second connecting channel 352.

[0067] When the rotating body 310 rotates to the first position, the synergistic effect of the piston component 320 and the angle disk 340 connects the pressure chamber 330 with the first connecting channel 351. At this time, the pressure chamber 330 is in an open state, and lubricating oil can flow from the oil inlet 101 through the first connecting channel 351 into the pressure chamber 330. As the piston component 320 moves, the pressure chamber 330 gradually increases, forming a negative pressure, which draws in the lubricating oil.

[0068] Next, as the rotating body 310 continues to rotate to the second position, the relative position of the piston component 320 and the angle disk 340 changes, causing the pressure chamber 330 to be disconnected from the first connecting channel 351 and connected to the second connecting channel 352. At this time, as the piston component 320 moves in the opposite direction, the oil in the pressure chamber 330 is squeezed and discharged into the lubricating oil passage 200 through the second connecting channel 352, and finally delivered to the various lubrication points of the lead screw nut.

[0069] This mechanism, which switches the connection between the two channels by rotating the body 310, is essentially a highly efficient valve control mechanism. It replaces the static valves in traditional lubrication systems and achieves precise control of the oil in a dynamic way, that is, opening or closing the channels at the appropriate time to facilitate the delivery of lubricating oil.

[0070] By controlling the dynamic channel of the separator 350, the amount of oil delivered from the inlet 101 to the lubrication channel 200 each time can be precisely controlled, avoiding the problems of over-lubrication and under-lubrication, ensuring the efficient use of the lubricating medium and reducing waste.

[0071] Traditional lubrication systems often require additional power supplies and complex wiring for valves, solenoid switches, and other control components. The dynamic valve control mechanism in this design simplifies the system structure, reduces the use of external control components, and lowers system complexity and cost. Because the rotation of the rotating body 310 is precisely controlled by a servo motor, this dynamic valve control mechanism provides more stable and consistent oil delivery, reduces lubrication fluctuations caused by valve opening and closing delays, and enhances system operational stability.

[0072] The lead screw nut structure also includes a pressure detection component 400, which is disposed on the nut body 100. At least a portion of the pressure detection component 400 extends into the lubrication oil passage 200 to detect the oil pressure in the lubrication oil passage 200.

[0073] The pressure detection component 400 can be a high-precision pressure sensor, such as a strain gauge pressure sensor, a piezoresistive pressure sensor, or a capacitive pressure sensor. Its front end is designed with a slender probe or sensing element that can extend into the oil in the lubrication channel 200, while the main body is fixed to the outside of the nut body 100 and connected to the control system via wires. When the lubricating oil flows in the lubrication channel 200, the pressure detection component 400 can collect oil pressure data in real time and transmit it to the control system, enabling the control system to adjust the operating parameters of the power component 300, such as the speed and rotation angle of the servo motor, according to the oil pressure conditions.

[0074] In actual operation, the pressure detection component 400 can monitor oil pressure changes within the lubrication passage 200, such as whether the oil pressure has reached the expected lubrication pressure threshold or whether there are abnormal fluctuations in oil pressure. This is especially important when detecting whether the lubricating oil is reaching the lubrication point smoothly and determining whether there are problems such as pipeline blockage or leakage. Based on the feedback from the pressure detection component 400, the control system can respond immediately, for example, by adjusting the stroke or speed of the piston component 320 to ensure that the lubrication point is always in the optimal lubrication state, avoiding equipment failure or performance degradation caused by poor lubrication.

[0075] The power assembly 300 also includes a drive component 360, which is disposed on the nut body 100. The drive component 360 has a drive shaft 361, which is drivenly connected to the rotating body 310 to drive the rotating body 310 to rotate.

[0076] In the design of the power assembly 300, the introduction of the drive component 360 is key to achieving automation and precise control of the entire lubrication system. The drive component 360 is typically positioned appropriately on the nut body 100 to facilitate a robust and efficient mechanical connection between its drive shaft 361 and the rotating body 310. In most cases, the drive component 360 can be a servo motor or other type of precision motor, characterized by its ability to provide precise speed and torque output, making it ideal for applications requiring a high degree of control.

[0077] In this application, the drive component 360 is a drive motor. The motor body and the drive shaft 361 are connected by a coupling 362. The drive motor is mounted on the lead screw nut end cover 160 of the nut body 100 via a motor mounting base 363. A ball bearing 365 is sleeved on the drive shaft 361. The inner and outer sides of the ball bearing 365 are respectively provided with a ball bearing inner ring positioning block 367 and a ball bearing outer ring positioning block 366. A cylindrical roller bearing housing adapter sleeve 371 is sleeved on the rotating body 310. A cylindrical roller bearing 373 is sleeved at the end of the cylindrical roller bearing housing adapter sleeve 371. A positioning transition sleeve 372 is provided between the cylindrical roller bearing 373 and the separating component 350. A piston end cover 322 is also provided at the end of the rotating body 310 near the angle plate 340 so that the piston component 320 is positioned by contacting the rotating body 310 through the piston end cover 322 during the piston's movement in the second direction.

[0078] In this application, the drive component 360 uses a drive motor as its power source. The motor body is connected to the drive shaft 361 via a coupling 362, ensuring that power is transmitted smoothly and efficiently from the motor to the rotating body 310. To securely mount the drive motor, a motor mounting base 363 is specially designed. It is mounted on the lead screw nut end cover 160 of the nut body 100, ensuring the stability of the motor and good heat dissipation, while also facilitating the integration and subsequent maintenance of the entire power assembly 300.

[0079] The ball bearing 365 mounted on the drive shaft 361 plays a crucial supporting and positioning role. Its inner and outer rings are fixed by the ball bearing inner ring positioning block 367 and the ball bearing outer ring positioning block 366 respectively, ensuring the stability of the drive shaft 361 during high-speed rotation and avoiding radial or axial displacement of the shaft, thereby improving the positioning accuracy and rotational smoothness of the rotating body 310.

[0080] The rotating body 310 is connected to the cylindrical roller bearing 373 via a cylindrical roller bearing housing adapter sleeve 371. The cylindrical roller bearing 373 maintains a distance from the separating component 350 via a positioning transition sleeve 372, forming a bearing system that is both stable and allows the rotating body 310 to rotate freely. This design not only improves the rotational accuracy of the rotating body 310 but also reduces friction, increases the service life of the bearing, and lowers system maintenance costs.

[0081] Finally, a piston end cap 322 is provided at one end of the rotating body 310 near the angle disk 340. When the piston component 320 moves in the second direction under the drive of the angle disk 340, the piston end cap 322 contacts the rotating body 310, providing additional positioning for the piston component 320, ensuring the precise stroke of the piston when compressing the oil in the pressure chamber 330, thereby ensuring the accuracy of quantitative lubrication.

[0082] This application also provides a processing device, including a lead screw and nut structure and a lead screw, wherein the lead screw and nut structure is threadedly connected to the lead screw, and the lead screw and nut structure is the lead screw and nut structure of the above embodiment.

[0083] The lead screw and nut structure of this application can solve the following problems:

[0084] 1. Eliminating pressure loss and oil supply instability in oil supply lines: Traditional long-pipeline lubrication systems suffer from significant pressure attenuation, leading to insufficient oil pressure at lubrication points. This application integrates the oil pump mechanism (power assembly 300) directly into the screw nut cavity, bringing the distance between the power source and the lubrication point close to zero, achieving high stability of oil supply pressure and significantly improving energy utilization.

[0085] 2. Achieve rapid dynamic adjustment of lubrication parameters: In view of the shortcomings of existing metering solutions that require machine shutdown and component replacement for adjustment, this invention breaks through the rigid limitation of the physical fixed volume cavity of the metering component. By using dual parameter control of servo motor speed and revolutions, it achieves stepless rapid adjustment of oil supply speed and single oil supply volume to meet the needs of equipment operating conditions.

[0086] 3. Resolve systemic risks caused by pipeline failure: By eliminating external oil outlet pipelines, lubrication interruptions caused by outlet pipe breakage and leakage and joint oil seepage are avoided, significantly reducing abnormal situations and saving installation and maintenance costs;

[0087] 4. Solve the problem of traditional open-loop lubrication solutions that cannot detect and control: Integrate a high-precision pressure sensor at the lubrication outlet to provide real-time feedback on the actual oil pressure at the lubrication point, providing significantly earlier warnings of lubrication failures and other anomalies compared to traditional solutions;

[0088] 5. Solves the problem of high installation cost of lubrication system: The power, metering and detection modules are highly integrated. During installation, only the corresponding cables, oil inlet pipe, sensor and communication interface need to be connected, which significantly saves assembly space and is suitable for compact scenarios;

[0089] 6. Reduce the risk of lubrication pollution and processing environment pollution: To address the pollution problem caused by excessive lubricating oil, this solution achieves precise quantitative control through a metering pump structure and servo motor closed-loop control, effectively reducing the amount of lubricant residue.

[0090] The quantitative oil pump mechanism is integrated into the lead screw nut flange position and driven by a servo motor. Its compact structure reduces installation costs compared to traditional external pump stations and also minimizes lubrication pressure loss from long oil outlet pipes, thereby lowering the power requirements of the pump station. Furthermore, by controlling the servo motor parameters, stepless adjustment of the lubricating oil volume and speed can be achieved. This also enables quantitative lubrication, avoiding problems such as loss of lead screw accuracy due to insufficient lubrication or contamination due to excessive lubrication.

[0091] By redesigning the lead screw nut flange and internal oil passages, the lubrication oil outlet pipe is integrated inside the lead screw nut, reducing the number of connecting pipelines during the lubrication process, reducing the risk of leakage, and solving the problem of leakage at the lubrication end connection.

[0092] An interface is designed at the oil outlet, and an oil outlet pressure sensor is installed to ensure that the oil outlet pressure meets the lubrication requirements while guaranteeing the reliability of lubrication, thereby enabling the monitoring and closed-loop control of the lubrication status at the lubrication point.

[0093] Traditional lubrication solutions for lead screws and nuts involve an external pump station pumping high-pressure lubricating oil at a set frequency. The oil travels through a long pipeline, is metered near the lubrication point by a metering valve, and then delivered to the lead screw and nut through the outlet pipeline to lubricate the rolling elements. While this solution theoretically meets the lubrication requirements of the lead screw and nut, in practical applications, it is prone to problems such as pipeline pressure loss and unstable oil supply. Furthermore, due to the numerous pipelines and high system pressure, leaks are likely to occur at pipeline connections. In addition, there are other issues such as inconvenient adjustment of lubrication parameters, high installation space and cost requirements, and inability to monitor lubrication status.

[0094] Traditional lead screw nut flanges only serve to connect and fix the moving parts. In order to facilitate the disassembly of the moving parts, the installation position of the lead screw nut of the moving parts is usually left with a notch. Therefore, there is a fan-shaped area on the lead screw nut flange that is not machined with a fixing through hole.

[0095] This application redesigns the unused sector area of ​​the lead screw nut to integrate the oil pump mechanism and lubrication passage.

[0096] The specific plan is as follows:

[0097] Thicken the non-fixed fan-shaped area of ​​the screw nut flange face (forming a protrusion 130), machine a flat surface on the front (arc surface) of the unused fan-shaped position of the flange, and machine a small recessed platform on both sides (forming a recessed part 140). Machine a plane through the oil passage to the other end on the small recessed platform, and machine two oil passages on the top surface of the flange, which intersect with the through oil passage. Figure 9 Two oil passages, one long and one short, are machined on the front of the flange. When viewed directly from the front, the left oil passage is machined as the longer one (i.e., lubrication passage 200), extending to the lubrication point or lubrication dispersion point (e.g., ...). Figure 8 The right-side oil passage is machined to connect with the side through-pass oil passage. A stepped hole and an angle plate fixing hole are machined on the flange front for the installation and positioning of the internal pumping components. See the improved isometric drawing of the lead screw and nut. Figure 1 .

[0098] An angle plate 340 is installed inside the improved lead screw and nut flange. An angle plate fixing hole is machined inside the flange to ensure that the angle plate 340 can rotate around its axis without angular wobble. Several plug adapters 341 are mounted on the angle plate 340, and piston components 320 are mounted on the adapters. The piston components 320 are inserted into corresponding plug holes in the rotating body 310, and piston end caps 322 are installed on the end faces of the plug holes. The rotating body 310 is splined to the drive shaft 361 via a spline groove, transmitting power from the servo motor to the rotating body 310 for controllable rotation. An inlet / outlet oil passage separator 350 is installed at the end of the rotating body 310, which separates the inlet / outlet oil passages and facilitates the pumping of oil between the rotating body 310 and the nut body 100. A cylindrical roller bearing 373 is installed inside the angle plate 340, with its outer ring positioned by a shoulder surface machined inside the lead screw and nut flange. The rotational support of the rotating body 310 is provided by a cylindrical roller bearing 373 via a cylindrical roller bearing housing adapter sleeve 371. The motor end of the drive shaft 361 is supported by a ball bearing 365. The positioning of the inner and outer rings of the bearing is achieved using corresponding bushings, glands, and other components. After installation, the locking nut 364 on the locking end cover is used to tighten the inner ring of the external threaded ball bearing. The servo motor is fixed to the lead screw nut end cover 160 via a motor mounting base 363, and its power is transmitted to the drive shaft 361 via a coupling 362. Figure 10 An outlet oil pressure sensor is installed in the oil passage at the pump oil outlet to detect and provide feedback on the lubrication pressure at lubrication points or lubrication dispersion points. Figure 11 ).

[0099] When the servo motor rotates at the set speed and angle, the power is transmitted to the drive shaft 361. The drive shaft 361 rotates by the corresponding angle, simultaneously driving the rotating body 310 to rotate. The rotating body 310 then drives the piston component 320 inside the sleeve to rotate around the axis of the drive shaft 361. Since the angle disc 340 can only rotate around its axis and cannot oscillate, the volume chamber between the piston component 320 and the rotating body 310 within the same plug hole constantly changes: as the piston component 320 gradually moves away from the front end face of the plug body's rotating cylinder, the pressure inside its volume chamber decreases. At this point, lubricating oil is drawn into the chamber through the oil inlet. When it rotates to the other end, the volume chamber shrinks, and the lubricating oil is expelled from the chamber. During the movement, the amount of lubricating oil drawn in and expelled is consistent for every 360° rotation of the piston component 320. The rotation angle of the rotating cylinder is related to the amount of lubricating oil expelled. Therefore, by precisely controlling the rotation angle of the servo motor, precise control of the expelled lubricating oil amount can be achieved, realizing the purpose of quantitative control. If the lubrication conditions change due to changes in equipment processing requirements, the lubrication conditions can be changed simply by changing the corresponding parameters. Through parameter adjustment, the amount of lubricating oil and the lubrication speed can be infinitely adjusted.

[0100] refer to Figure 12The working process of this device is as follows: The control system sets lubrication-related parameters (including motor rotation angle and speed, normal lubrication pressure range at lubrication points, lubrication time intervals, etc.). After system startup, the lubrication cycle begins. The system controls the servo motor to rotate according to the set parameters and simultaneously detects whether the lubrication outlet pressure meets the set range. When the detected pressure meets the range, the motor stops and waits for the next lubrication cycle. When the pressure does not meet the required range, the system checks whether the rotation angle fed back by the servo motor meets the requirements. If not, the motor continues to rotate until the pressure meets the specified range. If the detected pressure does not meet the specified range, but the number of rotations of the servo motor reaches the preset value, it indicates an abnormality in lubrication, and the equipment alarms and stops. The system must be restarted after troubleshooting to ensure it is working properly again. By adding dual detection of outlet pressure and servo motor rotation parameters, the equipment can always be in a normal lubrication state, avoiding the risk of accuracy loss or permanent failure of the lead screw pair due to lubrication failure.

[0101] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0102] 1. Integrated oil supply for lead screw and nut improves efficiency: By integrating the oil pump mechanism with the lead screw and nut in a spatial design, the pipeline pressure loss and leakage risk at the lubricating oil outlet under the traditional solution are eliminated, achieving high stability of oil supply pressure and fast dynamic response, improving energy utilization efficiency and reducing system power consumption;

[0103] 2. Breaking through the limitations of traditional solutions in terms of oil supply parameters and firmware: Based on the control of parameters such as servo motor speed and revolutions, it can break through the physical limitations of traditional metering components and realize a wide range of stepless adjustment of oil supply quantity and oil supply speed; it can adjust the corresponding motor parameters according to the lubrication quantity and lubrication speed required by real-time working conditions to solve the problems of over-lubrication and under-lubrication.

[0104] 3. Complete the construction of a closed-loop monitoring system for the lubrication system: a pressure sensor directly connected to the lubrication outlet provides real-time feedback of the outlet pressure, improving fault early warning capabilities; avoiding the risk of accuracy loss and permanent damage to the lead screw assembly due to lubrication failure;

[0105] 4. Achieving a compact lubrication system and a clean processing environment: The integrated pump mechanism eliminates redundant piping systems, significantly reducing space occupancy; quantitative control effectively suppresses oil mist contamination, meeting clean processing environment standards;

[0106] 5. Reduced overall operating costs: Lubricant consumption, maintenance time, and unexpected downtime are significantly reduced, while the lifespan of core components is extended, resulting in a decrease in the overall production cycle cost of the equipment.

[0107] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0108] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0109] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0110] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lead screw nut structure, characterized in that, include: The nut body (100) has an oil inlet (101) on its end face and an installation cavity (110) inside the nut body (100). A lubrication channel (200) is provided inside the nut body (100) to deliver lubricating oil to a predetermined lubrication position; A power assembly (300) is provided at least in the mounting cavity (110). The power assembly (300) includes a rotating body (310) and a piston component (320). The rotating body (310) has a receiving cavity (311). At least a portion of the piston component (320) is provided in the receiving cavity (311) and the piston component (320) is movably disposed relative to the rotating body (310). A pressure chamber (330) is provided between the piston component (320) and the rotating body (310). When the rotating body (310) rotates to a first position, the pressure chamber (330) communicates with the oil inlet (101), and the piston component (320) moves in a first direction to draw oil into the pressure chamber (330). When the rotating body (310) rotates to the second position, the pressure chamber (330) is connected to the lubricating oil passage (200), and the piston component (320) moves toward the second direction to push the oil into the lubricating oil passage (200).

2. The lead screw and nut structure according to claim 1, characterized in that, The nut body (100) is also provided with a first auxiliary oil passage (120), which is connected to the oil inlet (101) and the lubricating oil passage (200) respectively. The first auxiliary oil passage (120) extends along the axial direction of the nut body (100). The nut body (100) is also provided with a protrusion (130), the protrusion (130) protruding relative to the end face of the nut body (100), and at least a portion of the first auxiliary oil passage (120) is located on the protrusion (130).

3. The lead screw nut structure according to claim 2, characterized in that, A recess (140) is provided on the circumferential side surface of the nut body (100). The recess (140) is recessed from the circumferential side surface toward the center of the nut body (100). The recess (140) is located on the side of the protrusion (130). The nut body (100) is also provided with a second auxiliary oil passage (150), which is connected to the lubricating oil passage (200) and extends to the side wall of the recess (140).

4. The lead screw and nut structure according to claim 1, characterized in that, The power assembly (300) also includes: An angle disk (340) is disposed in the mounting cavity (110). One end of the angle disk (340) is movably connected to the inner wall of the mounting cavity (110), and the other end is connected to the piston component (320). The rotation axis of the angle disk (340) is set at an angle with the rotation axis of the rotating body (310) so that during the rotation of the rotating body (310), the angle disk (340) drives the piston component (320) to move in a first direction or a second direction.

5. The lead screw nut structure according to claim 4, characterized in that, The piston component (320) is provided with a connector (321) at its end, and at least a portion of the connector (321) is a spherical structure; An adapter (341) is provided on the angle disk (340), and at least a portion of the spherical structure is snapped into the adapter (341) so that the angle disk (340) is pivotally connected to the piston component (320).

6. The lead screw and nut structure according to claim 4, characterized in that, There are multiple receiving cavities (311), and the multiple receiving cavities (311) are arranged sequentially along the rotation axis of the rotating body (310). There are multiple piston components (320), and the multiple piston components (320) are arranged one-to-one with the multiple receiving cavities (311). The angle disk (340) is connected to each of the piston components (320).

7. The lead screw nut structure according to claim 1, characterized in that, The power assembly (300) also includes: A partition component (350) is disposed in the mounting cavity (110). The partition component (350) is provided with a first connecting channel (351) and a second connecting channel (352). The first connecting channel (351) is connected to the oil inlet (101), and the second connecting channel (352) is connected to the lubricating oil passage (200). When the rotating body (310) rotates to the first position, the pressure chamber (330) is connected to the oil inlet (101) through the first connecting channel (351). When the rotating body (310) rotates to the second position, the pressure chamber (330) is connected to the lubricating oil passage (200) through the second connecting channel (352).

8. The lead screw nut structure according to claim 1, characterized in that, The lead screw and nut structure also includes: A pressure detection component (400) is disposed on the nut body (100), at least a portion of the pressure detection component (400) extends into the lubrication passage (200) to detect the oil pressure in the lubrication passage (200).

9. The lead screw nut structure according to claim 1, characterized in that, The power assembly (300) also includes: A drive component (360) is disposed on the nut body (100). The drive component (360) has a drive shaft (361) which is drivenly connected to the rotating body (310) to drive the rotating body (310) to rotate.

10. A processing device, comprising a lead screw and nut structure and a lead screw, wherein the lead screw and nut structure is threadedly connected to the lead screw, characterized in that, The lead screw nut structure is the lead screw nut structure according to any one of claims 1 to 9.

Images