Ball screw pair with stroke limiting structure
By adding the design of buffer spring and rubber columns to the ball screw limiting mechanism, combined with the cleaning brush on the cleaning ring, the impact problem of the limiting mechanism during limiting is solved, the stability and safety of the mechanism are improved, and Cleaning of the screw surface is achieved.
Patent Information
- Application Number
- CN202420476484.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-12
AI Technical Summary
The existing ball screw limiting mechanism is prone to withstand a large impact during limiting, resulting in damage to the mechanism and lack of a buffer mechanism to protect the limiting mechanism.
A ball screw pair with a stroke limit structure is designed. By adding abutting rubber head, a buffer spring and a support telescopic rod on the slide, the elastic action of the buffer spring provides a buffering effect, and an additional buffering effect is added to the limiting part. The rubber column further improves the cushioning effect through the connecting spring, and at the same time, a cleaning brush is provided on the cleaning ring to clean the screw surface.
Effectively reduce the impact effect of the limiting mechanism during limiting, improve the stability and safety of the limiting mechanism, and extend the service life of the limiting mechanism through the use of elastic buffering materials, while achieving cleaning of the lead screw surface .
Smart Images
Figure CN222208829U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ball screws, in particular to a ball screw pair with a stroke limiting structure. Background Art
[0002] Ball screw limit refers to the limit protection device set during the movement of the ball screw system, which is used to limit the movement range of the ball screw to avoid exceeding the set position range. Common ball screw limit devices include mechanical limit and electronic limit. Mechanical limit is usually achieved by installing limit switches or limit pins at both ends of the ball screw. When the ball screw reaches the limit position, the limit device will trigger and stop the movement of the ball screw, thereby protecting the system from exceeding the required or tolerable position range. Electronic limit is usually achieved through programming or sensors. By setting the parameters of the range of motion in the control system, when the ball screw reaches the set limit position, the control system will stop the movement of the ball screw to protect the system.
[0003] The patent specification with the announcement number CN212627749U discloses a ball screw with a limiting structure, including a base, a first connecting column fixedly connected to the left side of the base, a second connecting column fixedly connected to the right side of the base, a fixed rod fixedly connected to the top of the first connecting column and the second connecting column on the opposite side, a motor fixedly connected to the left side of the first connecting column, a coupling fixedly connected to the output end of the motor, and a lead screw fixedly connected to the right side of the coupling. The utility model can effectively solve the problem that the traditional ball screw is easily damaged by using an external stroke switch for control through the coordinated use of the base, the first connecting column, the second connecting column, the fixed rod, the motor, the coupling, the lead screw, the feed nut, the fixed block, the connecting rod, the bracket, the pulley and the slideway. The device has a good limiting structure, which can protect the feed nut from exceeding the stroke when the external stroke is damaged, thereby improving safety. The first limiting block and the second limiting block are set, which can further improve the stroke limiting function of the feed nut and ensure the stability of horizontal movement.
[0004] However, in the implementation of relevant technologies, it was found that the ball screw with a limiting structure of the above-mentioned design has the following problems: since no buffer mechanism is provided between the limiting mechanism and the feed nut when the feed nut reaches the set limiting position, it is easy for the limiting mechanism to be subjected to a large impact during limiting, resulting in damage to the limiting mechanism. In view of this, a ball screw pair with a travel limiting structure is provided to overcome the above-mentioned defects. Utility Model Content
[0005] The utility model aims to solve the shortcomings in the prior art and proposes a ball screw pair with a stroke limiting structure.
[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a ball screw pair with a stroke limiting structure, comprising a screw, a nut is arranged on the top surface of the screw, a guide bin is arranged on the outside of the screw, a guide groove is opened on the end surface of the guide bin close to the screw, and a matching slider is installed inside the guide groove, the guide bin can guide the moving nut, so that the nut is more stable when moving, buffer springs are fixedly installed on the front and rear ends of the slider, and a supporting telescopic rod is penetrated inside the buffer spring, an end of the buffer spring away from the slider is fixedly connected with an abutting rubber head, a connecting rod is arranged on one side of the slider, and the other end of the connecting rod is fixedly connected to the nut, limiting members are fixed on the front and rear sides of the screw surface, the limiting members can limit the stroke of the nut, and when the slider gradually approaches the front and rear ends of the guide groove, the abutting rubber head first abuts against the guide groove and squeezes the buffer spring and the supporting telescopic rod inward, the buffer spring and the supporting telescopic rod are gradually compressed inward, and a force in the opposite direction is generated, and the elastic effect of the buffer spring is utilized to achieve a certain buffering effect.
[0007] As a further description of the above technical solution: cleaning rings are arranged on both the front and rear sides of the nut, and a cleaning brush is arranged on the inner wall of the cleaning ring, and the cleaning ring can move synchronously with the forward and backward movement of the nut.
[0008] As a further description of the above technical solution: the cleaning brushes are distributed in a circle along the axis of the lead screw, and the cleaning brushes and the lead screw fit each other. The cleaning brushes can move synchronously under the action of the cleaning ring to clean the surface of the lead screw.
[0009] As a further description of the above technical solution: a fixing piece is installed inside the limit piece, and a connecting spring is connected to the top of the fixing piece, and a rubber column is fixed to the other end of the connecting spring. After the cleaning ring gradually approaches the limit piece, the rubber column and the cleaning ring contact each other, which plays a certain protective role on the cleaning ring.
[0010] As a further description of the above technical solution: a shock absorbing head is arranged at the top of the rubber column, and the rubber column passes through the limiting piece and is fixedly connected to the shock absorbing head. The rubber column is elastically connected to the fixing piece through a connecting spring. After the rubber column is impacted by the cleaning ring, it can be retracted to the inside of the limiting piece. Moreover, since the rubber column is a T-shaped structure, the rubber column can be limited, and the buffering effect of the limiting piece is further improved by the connecting spring.
[0011] As a further description of the above technical solution: the length of the guide groove is the same as the distance between the two sets of limit members, and the slider slides in the guide bin through the guide groove, and the guide groove guides the slider.
[0012] As a further description of the above technical solution: the abutting rubber head is elastically connected to the slider via a buffer spring and a supporting telescopic rod, and the supporting telescopic rod can limit the stretching of the buffer spring to prevent the buffer spring from being over-stretched.
[0013] The utility model has the following beneficial effects:
[0014] The utility model designs a ball screw pair with a stroke limit structure. By adding an abutting rubber head, a buffer spring and a supporting telescopic rod on the sliding block, since the length of the guide groove is the same as the distance between the two sets of limit members, when the nut reaches the set limit position, the abutting rubber head abuts against the guide groove, thereby squeezing the buffer spring and the supporting telescopic rod inwardly, and utilizing the elastic effect of the buffer spring to have a certain buffering effect on the entire guide bin.
[0015] The utility model designs a ball screw pair with a stroke limit structure. A rubber column is added to the limit member. After being hit, the rubber column can squeeze the connecting spring inward, thereby further improving the buffering effect of the screw through the connecting spring. A cleaning brush is arranged on the cleaning ring, which can move back and forth on the screw under the action of a nut to clean the surface of the screw. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0017] Figure 2 It is a structural schematic diagram of the lead screw of the utility model;
[0018] Figure 3 It is a partial structural schematic diagram of the lead screw of the utility model;
[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the limiting member of the utility model.
[0020] Legend:
[0021] 1. Guide bin; 2. Lead screw; 3. Limiting piece; 4. Guide groove; 5. Slider; 6. Cleaning ring; 7. Connecting rod; 8. Buffer spring; 9. Support telescopic rod; 10. Abutting rubber head; 11. Nut; 12. Cleaning brush; 13. Fixing piece; 14. Shock-absorbing head; 15. Rubber column; 16. Connecting spring. DETAILED DESCRIPTION
[0022] Reference Figure 1-4The utility model provides a ball screw pair with a stroke limit structure: it includes a screw 2, a nut 11 is arranged on the top surface of the screw 2, a guide bin 1 is arranged outside the screw 2, a guide groove 4 is opened on the end surface of the guide bin 1 close to the screw 2, and a matching slider 5 is installed inside the guide groove 4, the guide bin 1 can guide the moving nut 11, so that the nut 11 is more stable when moving, and buffer springs 8 are fixedly installed at both ends of the slider 5, and a supporting telescopic rod 9 is penetrated inside the buffer spring 8, and the end of the buffer spring 8 away from the slider 5 It is fixedly connected with an abutting rubber head 10, a connecting rod 7 is provided on one side of the slider 5, and the other end of the connecting rod 7 is fixedly connected with the nut 11, and the front and rear sides of the surface of the screw 2 are fixed with limiting members 3, and the limiting members 3 can limit the stroke of the nut 11, and when the slider 5 gradually approaches the front and rear ends of the guide groove 4, the abutting rubber head 10 first abuts against the guide groove 4, and squeezes the buffer spring 8 and the supporting telescopic rod 9 inward, and the buffer spring 8 and the supporting telescopic rod 9 are gradually compressed inward, and generate forces in opposite directions, and the elastic effect of the buffer spring 8 is utilized to achieve a certain buffering effect.
[0023] As a further implementation scheme of the above technical scheme: cleaning rings 6 are provided on both the front and rear sides of the nut 11 , and a cleaning brush 12 is provided on the inner wall of the cleaning ring 6 , and the cleaning ring 6 can move synchronously with the forward and backward movement of the nut 11 .
[0024] As a further implementation scheme of the above technical scheme: the cleaning brush 12 is distributed in a circle along the axis of the screw 2, and the cleaning brush 12 and the screw 2 are in contact with each other. The cleaning brush 12 can move synchronously under the action of the cleaning ring 6 to clean the surface of the screw 2.
[0025] During specific implementation, the end of the screw 2 is connected to the power output end of the motor. The motor can drive the screw 2 to rotate, so that the nut 11 makes a linear motion on the screw 2. At this time, the nut 11 drives the slider 5 to slide inside the guide groove 4 through the connecting rod 7. At the same time, the nut 11 drives the cleaning brush 12 to move back and forth on the screw 2 through the cleaning ring 6. The cleaning brush 12 can completely clean the surface of the screw 2 when moving.
[0026] As a further implementation scheme of the above technical scheme: a fixing part 13 is installed inside the limit member 3, and a connecting spring 16 is connected to the top of the fixing part 13, and a rubber column 15 is fixed to the other end of the connecting spring 16. After the cleaning ring 6 gradually approaches the limit member 3, the rubber column 15 and the cleaning ring 6 are in contact with each other, which plays a certain protective role on the cleaning ring 6.
[0027] As a further implementation scheme of the above technical scheme: a shock absorbing head 14 is arranged at the top of the rubber column 15, and the rubber column 15 passes through the limiter 3 and is fixedly connected to the shock absorbing head 14, and the rubber column 15 is elastically connected to the fixing member 13 through a connecting spring 16. After the rubber column 15 is impacted by the cleaning ring 6, it can be retracted to the inside of the limiter 3, and because the rubber column 15 is a T-shaped structure, the rubber column 15 can be limited, and the buffering effect of the limiter 3 is further improved by the connecting spring 16.
[0028] As a further implementation scheme of the above technical scheme: the length of the guide groove 4 is the same as the distance between the two sets of limit members 3, and the slider 5 slides in the guide bin 1 through the guide groove 4, and the guide groove 4 guides the slider 5.
[0029] As a further implementation scheme of the above technical scheme: the abutting rubber head 10 is elastically connected to the slider 5 through the buffer spring 8 and the supporting telescopic rod 9. The supporting telescopic rod 9 can limit the stretching of the buffer spring 8 to prevent the buffer spring 8 from being over-stretched.
[0030] During specific implementation, since the length of the guide groove 4 is the same as the distance between the two sets of limit members 3, the guide groove 4 can limit the stroke of the screw pair. When the slider 5 gradually approaches the front and rear ends of the guide groove 4, the abutting rubber head 10 first abuts against the guide groove 4 and squeezes the buffer spring 8 and the supporting telescopic rod 9 inward. The buffer spring 8 and the supporting telescopic rod 9 are gradually compressed inward and generate forces in opposite directions. The elastic effect of the buffer spring 8 is used to achieve a certain buffering effect. At the same time, the nut 11 reaches the set limit position, the cleaning ring 6 and the rubber column 15 abut against each other, and squeeze the connecting spring 16 inward, so as to further improve the buffering effect of the screw 2 through the connecting spring 16.
[0031] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A ball screw pair with a stroke limit structure, comprising a screw (2), a nut (11) being arranged on the top surface of the screw (2), a guide bin (1) being arranged outside the screw (2), a guide groove (4) being arranged on the end surface of one side of the guide bin (1) close to the screw (2), and a matching slider (5) being installed inside the guide groove (4), characterized in that: Buffer springs (8) are fixedly installed at both the front and rear ends of the slider (5), and a supporting telescopic rod (9) is inserted into the interior of the buffer spring (8). One end of the buffer spring (8) away from the slider (5) is fixedly connected to an abutting rubber head (10). A connecting rod (7) is provided on one side of the slider (5), and the other end of the connecting rod (7) is fixedly connected to a nut (11). Limiting members (3) are fixed on both the front and rear sides of the surface of the lead screw (2).
2. The ball screw pair with a travel limit structure according to claim 1, characterized in that: Cleaning rings (6) are provided on both the front and rear sides of the nut (11), and a cleaning brush (12) is provided on the inner wall of the cleaning ring (6).
3. The ball screw pair with a travel limit structure according to claim 2, characterized in that: The cleaning brushes (12) are distributed in a circular pattern along the axis of the lead screw (2), and the cleaning brushes (12) and the lead screw (2) are in close contact with each other.
4. The ball screw pair with a travel limit structure according to claim 1, characterized in that: A fixing piece (13) is installed inside the limiting piece (3), and a connecting spring (16) is connected to the top of the fixing piece (13), and a rubber column (15) is fixed to the other end of the connecting spring (16).
5. The ball screw pair with a stroke limit structure according to claim 4, characterized in that: A shock absorbing head (14) is arranged at the top end of the rubber column (15), and the rubber column (15) penetrates the limiting member (3) and is fixedly connected to the shock absorbing head (14), and the rubber column (15) is elastically connected to the fixing member (13) via a connecting spring (16).
6. The ball screw pair with a travel limit structure according to claim 1, characterized in that: The length of the guide groove (4) is the same as the distance between the two sets of position-limiting members (3), and the sliding block (5) slides in the guide bin (1) through the guide groove (4).
7. The ball screw pair with a travel limit structure according to claim 1, characterized in that: The abutting rubber head (10) is elastically connected to the sliding block (5) via a buffer spring (8) and a supporting telescopic rod (9).