Anti-locking ball screw
By designing an anti-locking mechanism in the ball screw, and utilizing hydraulic and spring buffers, the problem of nut locking caused by abnormal power failure of the motor is solved, ensuring normal operation of the equipment and reducing damage.
Patent Information
- Application Number
- CN202520526492.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-03-25
AI Technical Summary
When the motor experiences an abnormal power outage, the ball screw continues to rotate due to inertia, causing the nut to come off, resulting in equipment damage and affecting the equipment's reliability and service life.
Design an anti-locking ball screw, including an anti-locking mechanism, a buffer assembly, and an auxiliary buffer assembly, utilizing hydraulic buffering principle and spring buffering to prevent the nut from locking up.
It effectively prevents the nut from locking due to inertial slippage, ensuring the normal operation of the ball screw drive system and reducing equipment damage.
Smart Images
Figure CN223635265U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of anti-lock screw rod, and particularly relates to an anti-lock ball screw. BACKGROUND
[0002] In industrial production, ball screws are widely used in various mechanical equipment as an important transmission component, such as numerical control machine tools, automated production lines, industrial robots, etc.
[0003] However, when the motor driving the screw rod encounters an abnormal power failure or other sudden situations, the motor loses power output instantaneously and cannot control the rotation of the screw rod. At this time, the screw rod will continue to rotate due to inertia, and in turn drive the nut to move along the screw rod axis. The nut will also continue to slip under the action of inertia, and it is extremely likely to move out of the normal working stroke range. Once the nut exceeds the normal stroke, it is easy to collide with the surrounding components or get stuck in an abnormal position, causing the nut to lock, so that the entire ball screw transmission system cannot operate normally. At present, the common solution to avoid such phenomena includes setting a stop ring at the end of the screw rod, relying on the abutment of the stop ring and the end of the nut to limit the displacement of the nut. However, this method has certain limitations, as the stop ring and the nut are in direct rigid contact, which may cause damage to the nut and the stop ring when subjected to a large impact force, affecting the reliability and service life of the equipment. Therefore, how to invent an anti-lock ball screw to improve these problems has become a problem that needs to be solved by technical personnel in the field. SUMMARY
[0004] To make up for the above shortcomings, the utility model provides an anti-lock ball screw, aiming to improve the problem that when the motor driving the screw rod encounters an abnormal power failure or other sudden situations, the screw rod will continue to rotate due to inertia, and the nut will move out of the normal working stroke range and collide or get stuck in an abnormal position under the action of inertia, causing the nut to lock, so that the entire ball screw transmission system cannot operate normally.
[0005] The utility model is implemented as follows: an anti-lock ball screw, comprising
[0006] A screw rod body, the screw rod body comprising a screw rod and a nut, the nut being transmissionally connected to the screw rod;
[0007] A lock prevention mechanism, the lock prevention mechanism comprising a buffer assembly, the buffer assembly being arranged at both ends of the nut, the buffer assembly comprising a buffer plate, the buffer plate being slidably connected to the buffer seat;
[0008] An auxiliary buffer assembly is arranged between the buffer plate and the buffer seat, the auxiliary buffer assembly comprising a spring, one end of the spring being connected to the buffer plate, and the other end of the spring being connected to the buffer seat.
[0009] In a preferred technical scheme of the utility model, one side of the buffer plate is fixedly connected with a sealing sliding ring, the sealing sliding ring sealingly and slidingly penetrates the buffer seat, one end of the sealing sliding ring away from the buffer plate is fixedly connected with a piston plate, and the piston plate pistonically slides inside the buffer seat.
[0010] In a preferred technical scheme of the utility model, hydraulic oil is arranged between the piston plate and the buffer seat.
[0011] In a preferred technical scheme of the utility model, an energy storage cavity is formed in the inner wall of the buffer seat, the energy storage cavity is communicated with the inside of the buffer seat through a throttle valve.
[0012] In a preferred technical scheme of the utility model, the piston plate slides with the outer wall of the energy storage cavity, the energy storage cavity and the bottom of the buffer seat are provided with a gap, and the throttle valve is located in the gap and communicated with the energy storage cavity.
[0013] In a preferred technical scheme of the utility model, the outer side of the buffer plate is provided with a rubber buffer pad.
[0014] In a preferred technical scheme of the utility model, the cross section of the buffer plate, the sealing sliding ring and the piston plate is H-shaped.
[0015] In a preferred technical scheme of the utility model, the spring is located outside the sealing sliding ring, the inner bottom of the spring is provided with a mounting column, the mounting column is fixedly connected with the buffer seat, and the spring is fixedly sleeved on the mounting column.
[0016] In a preferred technical scheme of the utility model, a limiting ring is fixedly installed on the side of the buffer plate close to the spring, and the limiting ring abuts against the spring.
[0017] In a preferred technical scheme of the utility model, the limiting ring is a Z-shaped ring rotated by 90 degrees clockwise, and the spring is arranged in the limiting ring.
[0018] The utility model discloses a kind of advantages, the utility model obtains a kind of anti-lock ball screw by the above design, the setting of locking mechanism is prevented when using, can be when the screw nut is about to move out normal working stroke range, through the buffering assembly and auxiliary buffering assembly joint action, the movement of screw nut is buffered and braked, avoid the locking of screw nut due to inertia and continue to slide, ensure that ball screw can continue normal work.
[0019] The buffer plate, the piston plate and the hydraulic oil in the buffer seat in the buffer assembly work in coordination, and the kinetic energy of the nut movement can be effectively absorbed by using the hydraulic buffering principle.
[0020] The rubber buffer pad outside the buffer plate further protects the components during the buffering process and reduces the rigid collision between the components. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can be obtained without creative labor on the basis of these drawings.
[0022] Figure 1 is a schematic diagram of the screw rod body structure provided by the embodiments of the present application;
[0023] Figure 2 is a schematic diagram of the cross-sectional structure of the anti-lock mechanism provided by the embodiments of the present application;
[0024] Figure 3 is a schematic diagram of the buffer assembly structure provided by the embodiments of the present application;
[0025] Figure 4 is a schematic diagram of the auxiliary buffer assembly structure provided by the embodiments of the present application.
[0026] In the drawings: 100-screw rod body; 110-screw; 120-nut; 200-anti-lock mechanism; 210-buffer assembly; 211-buffer plate; 212-buffer seat; 213-sealing sliding ring; 214-piston plate; 215-hydraulic oil; 216-energy storage cavity; 220-auxiliary buffer assembly; 221-limiting ring; 222-spring; 223-mounting column. DETAILED DESCRIPTION
[0027] For the purposes, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0028] Please refer to Figure 1 and Figure 2 The present application provides a technical solution: a lock prevention ball screw, comprising
[0029] The screw body 100 comprises a screw rod 110 and a nut 120, and the nut 120 is drivingly connected to the screw rod 110; the lock prevention mechanism 200 comprises a buffer assembly 210, which is arranged at both ends of the nut 120, and the buffer assembly 210 comprises a buffer plate 211, and a buffer seat 212 is arranged on the outer side of the buffer plate 211 in communication, and the buffer plate 211 is slidingly connected to the buffer seat 212; an auxiliary buffer assembly 220 is arranged between the buffer plate 211 and the buffer seat 212, and the auxiliary buffer assembly 220 comprises a spring 222, one end of which is connected to the buffer plate 211, and the other end of the spring 222 is connected to the buffer seat 212; the arrangement of the lock prevention mechanism 200 can buffer and brake the movement of the nut 120 through the joint action of the buffer assembly 210 and the auxiliary buffer assembly 220 when the nut 120 is about to move out of the normal working stroke range, so as to avoid the nut 120 from being locked due to inertia and ensure that the ball screw can continue to work normally.
[0030] Please refer to Figure 3 and Figure 4The side of the buffer plate 211 is fixedly connected with a sealing sliding ring 213, the sealing sliding ring 213 is sealingly and slidingly penetrated through the buffer seat 212, the end of the sealing sliding ring 213 away from the buffer plate 211 is fixedly connected with a piston plate 214, the piston plate 214 is slidingly arranged in the buffer seat 212, and the buffer seat 212 can be arranged on the bearing seat at the two ends of the nut 120 or the bearing seat at the two ends of the lead screw 110 (or other positions). The piston plate 214 and the buffer seat 212 are provided with hydraulic oil 215. The inner wall of the buffer seat 212 is provided with an energy storage cavity 216, the energy storage cavity 216 is in communication with the inside of the buffer seat 212 through a throttle valve. The piston plate 214 is slidingly arranged on the outer wall of the energy storage cavity 216, the energy storage cavity 216 is provided with a gap with the bottom of the buffer seat 212, and the throttle valve is arranged in the gap and in communication with the energy storage cavity 216. The outer side of the buffer plate 211 is provided with a rubber buffer pad to avoid friction. The buffer plate 211, the sealing sliding ring 213 and the piston plate 214 have a I-shaped cross section, and the buffer plate 211, the piston plate 214 and the hydraulic oil 215 in the buffer seat 212 in the buffer assembly 210 work cooperatively, and the kinetic energy of the nut 120 is effectively absorbed by using the hydraulic buffering principle.
[0031] The spring 222 is arranged outside the sealing sliding ring 213, the inner bottom of the spring 222 is provided with a mounting column 223, the mounting column 223 is fixedly connected with the buffer seat 212, and the spring 222 is fixedly sleeved on the mounting column 223. The side of the buffer plate 211 close to the spring 222 is fixedly provided with a limiting ring 221, and the limiting ring 221 abuts against the spring 222. The limiting ring 221 has a Z-shaped cross section after being rotated by 90 degrees clockwise, the spring 222 is arranged in the limiting ring 221, and the spring 222 further enhances the buffering effect, so that the buffering process is more stable, and the impact damage to the nut 120 and the lead screw body 100 is reduced.
[0032] Working principle: when the motor normally drives the lead screw body 100, the nut 120 moves along the lead screw 110 stably, the locking mechanism 200 is in a standby state, the relative static state is maintained between the components, and the buffer assembly 210 and the auxiliary buffer assembly 220 are not subjected to obvious acting force.
[0033] When the motor encounters an abnormal power failure, the lead screw 110 continues to drive the nut 120 to slide due to inertia. When the nut 120 moves close to the end of the stroke, the end of the nut 120 contacts the buffer plate 211 and pushes the buffer plate 211. The buffer plate 211 drives the sealing sliding ring 213 and the piston plate 214 to slide in the buffer seat 212, and the piston plate 214 extrudes the hydraulic oil 215 in the buffer seat 212. The hydraulic oil 215 flows to the energy storage cavity 216 through the throttle valve. Due to the flow limiting effect of the throttle valve, the flow speed of the hydraulic oil 215 is slowed down, generating a larger resistance. The piston plate 214 and the buffer plate 211 connected thereto and the nut 120 form a reverse buffering force, consuming part of the kinetic energy of the nut 120. At the same time, the spring 222 in the auxiliary buffer assembly 220 is compressed by the extrusion of the buffer plate 211, and the elastic force of the spring 222 also generates a reverse force on the nut 120, further buffering the movement of the nut 120. Under the action of the rubber buffer pad, the collision between the nut 120 and the buffer plate 211 is moderated, reducing the damage of the impact force to the components. Throughout the process, the limiting ring 221 ensures that the spring 222 remains stable during compression and expansion, and the mounting column 223 provides stable support for the spring 222. Through the double action of hydraulic buffering and spring 222 buffering, the nut 120 gradually slows down and stops before reaching the stroke limit, effectively preventing the nut 120 from moving out of the normal working stroke range and being locked, and at the same time the spring 222 will slowly drive the buffer plate 211 to rebound after the nut 120 stops for next use.
[0034] The preferred embodiments of the utility model have been described above, and are not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A self-locking ball screw, characterized by, Comprising A screw rod body comprising a screw rod and a nut, the nut being drivingly connected to the screw rod; A lock prevention mechanism comprising a buffer assembly arranged at both ends of the nut, the buffer assembly comprising a buffer plate, an outer side of the buffer plate being provided with a buffer seat, the buffer plate being slidingly connected to the buffer seat; An auxiliary buffer assembly is arranged between the buffer plate and the buffer seat, the auxiliary buffer assembly comprising a spring, one end of the spring being connected to the buffer plate, the other end of the spring being connected to the buffer seat.
2. The anti-locking ball screw according to claim 1, wherein: A sealing sliding ring is fixedly connected to one side of the buffer plate, the sealing sliding ring sealingly slidingly penetrating the buffer seat, one end of the sealing sliding ring away from the buffer plate being fixedly connected to a piston plate, the piston plate slidingly inside the buffer seat.
3. The anti-stiction ball screw of claim 2, wherein: Hydraulic oil is arranged between the piston plate and the buffer seat.
4. The anti-stiction ball screw of claim 2, wherein: An energy storage cavity is formed in the inner wall of the buffer seat, the energy storage cavity being in communication with the inside of the buffer seat through a throttle valve.
5. The anti-stiction ball screw of claim 4, wherein: The piston plate and the outer wall of the energy storage cavity slide, the energy storage cavity and the bottom of the buffer seat have a gap, and the throttle valve is located in the gap and is in communication with the energy storage cavity.
6. The anti-stiction ball screw of claim 4, wherein: A rubber buffer pad is arranged on the outer side of the buffer plate.
7. The anti-stiction ball screw of claim 4, wherein: The cross section of the buffer plate, the sealing sliding ring and the piston plate is H-shaped.
8. The anti-stiction ball screw of claim 4, wherein: The spring is located on the outer side of the sealing sliding ring, the inner bottom of the spring is provided with a mounting column, the mounting column is fixedly connected to the buffer seat, and the spring is fixedly connected to the mounting column.
9. The anti-stiction ball screw of claim 8, wherein: A limiting ring is fixedly installed on the side of the buffer plate close to the spring, and the limiting ring abuts against the spring.
10. The anti-stiction ball screw of claim 9, wherein: The limiting ring is a H-shaped ring rotated by 90 degrees clockwise, and the spring is arranged in the limiting ring.