Lead screw movement protection device

Abstract

The utility model discloses a lead screw motion protection device which comprises a ball screw and a lead screw nut which are matched with each other, the ball screw is fixed between a first bearing seat and a second bearing seat, one end of the first bearing seat is provided with a first magnetic ring, one end of the lead screw nut is provided with a second magnetic ring, and the other end of the lead screw nut is provided with a third magnetic ring. A fourth magnetic ring is arranged at one end of the second bearing seat; the first magnetic ring and the second magnetic ring are oppositely arranged, and when approaching to a certain distance, the first magnetic ring and the second magnetic ring are respectively electrified to form magnets with the same magnetic poles; and the third magnetic ring and the fourth magnetic ring are oppositely arranged, and are respectively electrified to form magnets with the same magnetic poles when approaching to a certain distance. According to the lead screw movement protection device, mutual repulsive force can be generated between the magnetic rings on the lead screw nut and the magnetic rings on the front and rear bearing seats at the moment that the movement of the ball screw is out of control, the closer the distance is, the larger the repulsive force is, the impact force between the lead screw nut and the front and rear devices is effectively buffered, and the lead screw nut is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a screw movement protection device. Background Art

[0002] At present, the front and rear limit protection devices for screw movement commonly used in the market are all mechanical protection devices. When the servo motor or control system is out of control, the moving parts driven by the screw nut will instantly hit the front and rear limit blocks at high speed with a large inertia. The impulse generated in the process is very large, which can easily damage the screw nut.

[0003] Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0004] In view of the above technical problems, the utility model provides a screw movement protection device and a control method, which can generate a mutual repulsive force between the screw nut and the front and rear limit devices at the moment when the ball screw moves out of control. The closer the distance, the greater the repulsive force, which can effectively alleviate the impact force between the screw nut and the front and rear limit devices and protect the screw nut.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A screw movement protection device comprises a ball screw and a screw nut which cooperate with each other, the ball screw being fixed between a first bearing seat and a second bearing seat, a first magnetic ring being provided at one end of the first bearing seat, a second magnetic ring being provided at one end of the screw nut and a third magnetic ring being provided at the other end, and a fourth magnetic ring being provided at one end of the second bearing seat; the first magnetic ring and the second magnetic ring are arranged opposite to each other, and when the two are close to a certain distance, they are respectively energized to form magnets with the same magnetic poles; the third magnetic ring and the fourth magnetic ring are arranged opposite to each other, and when the two are close to a certain distance, they are respectively energized to form magnets with the same magnetic poles; the first bearing seat is fixed on a motor support seat, and the second bearing seat is fixed on a fixed seat.

[0007] The above-mentioned screw movement protection device can generate a mutual repulsive force between the magnetic ring on the screw nut and the magnetic rings on the front and rear bearing seats at the moment when the ball screw moves out of control. The closer the distance, the greater the repulsive force, which can effectively alleviate the impact force between the screw nut and the front and rear limit devices and protect the screw nut.

[0008] According to a further optimized solution, a first magnetic isolation sleeve is provided between the first bearing seat and the first magnetic ring, a second magnetic isolation sleeve is provided between the lead screw nut and the second magnetic ring, a third magnetic isolation sleeve is provided between the lead screw nut and the third magnetic ring, and a fourth magnetic isolation sleeve is provided between the second bearing seat and the fourth magnetic ring.

[0009] A magnetic isolation sleeve is added between the lead screw nut and the magnetic ring to prevent the magnetism generated by the magnetic body from affecting the lead screw nut; a magnetic isolation sleeve is added between the front and rear bearing seats and the magnetic ring to prevent the magnetism generated by the magnetic ring from affecting the front and rear bearing seats and other parts installed in the surrounding area.

[0010] A further optimized solution further includes a servo motor and a server, wherein the servo motor is fixed on the motor support seat, and the server controls the servo motor to drive the ball screw to rotate. The servo motor is installed on the motor support seat, and the overall structure is simple and reliable, and the movement is stable.

[0011] A further optimized solution further includes a movable plate and a linear guide rail, wherein the movable plate is connected to the screw nut and moves on the linear guide rail. The screw nut drives the movable plate to move forward and backward on the linear guide rail, and other components are installed on the movable plate to ensure the stability of the movement.

[0012] A further optimized solution also includes a support platform, and the motor support seat, the fixing seat and the linear guide rail are respectively fixed on the support platform.

[0013] A further optimized solution further includes an energy recovery device, which is electrically connected to the servo motor to store excess electrical energy during the movement of the servo motor; the energy recovery device energizes the first magnetic ring, the second magnetic ring, the third magnetic ring, and the fourth magnetic ring. The use of the energy recovery device is conducive to energy saving and reduces the use cost of the protective device.

[0014] A further optimized solution further includes a controller, a first inductive switch and a second inductive switch, wherein the first inductive switch and the second inductive switch are located at both ends of the ball screw and sense the terminal positions of the movement of the two ends of the screw nut; the controller is electrically connected to the first inductive switch, the second inductive switch, the servo and the energy recovery device. The use of the controller, the first inductive switch and the second inductive switch ensures the safety of the screw nut during the normal movement stroke, avoids collision between the screw nut and the two fixed ends of the ball screw, and protects the screw nut.

[0015] Compared with the prior art, the utility model has the following technical advantages:

[0016] The screw movement protection device installs magnetic rings on the front and rear ends of the screw nut, and also installs magnetic rings at the travel end positions before and after the ball screw. The magnetic rings are energized to become magnetic bodies with the same polarity. When the magnetic body on the screw nut and the magnetic bodies before and after the ball screw approach each other, the two magnetic bodies with the same polarity generate repulsive force on each other to prevent the two from approaching each other, and the closer the distance, the greater the mutual repulsive force, which can effectively buffer the impulse of the screw nut and the fixings at both ends of the ball screw to protect the screw nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a specific embodiment of a screw rod motion protection device of the utility model;

[0018] Figure 2 yes Figure 1 Schematic diagram of the middle screw nut close to the motor support base;

[0019] Figure 3 yes Figure 1 Schematic diagram of the middle screw nut close to the fixed seat.

[0020] In the figure: servo motor 1, ball screw 2, first bearing seat 3, motor support seat 4, first magnetic isolation sleeve 5, first magnetic ring 6, second magnetic ring 7, second magnetic isolation sleeve 8, screw nut 9, movable plate 10, third magnetic isolation sleeve 11, third magnetic ring 12, fourth magnetic ring 13, fourth magnetic isolation sleeve 14, fixed seat 15, second bearing seat 16, linear guide 17, first induction switch 18, second induction switch 19, energy recovery device 20, server 21, controller 22, support platform 23. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the embodiments in the accompanying drawings.

[0022] like Figures 1 to 3 As shown, a specific embodiment of a screw rod movement protection device of the utility model is provided.

[0023] like Figure 1 As shown, the screw movement protection device of this embodiment includes a ball screw 2 and a screw nut 9 that cooperate with each other. The ball screw 2 is fixed between a first bearing seat 3 and a second bearing seat 16. A first magnetic ring 6 is provided at one end of the first bearing seat 3, a second magnetic ring 7 is provided at one end of the screw nut 9 and a third magnetic ring 12 is provided at the other end, and a fourth magnetic ring 13 is provided at one end of the second bearing seat 16; the first magnetic ring 6 and the second magnetic ring 7 are arranged opposite to each other, and when the two are close to a certain distance, they are respectively energized to form magnets with the same magnetic poles; the third magnetic ring 12 and the fourth magnetic ring 13 are arranged opposite to each other, and when the two are close to a certain distance, they are respectively energized to form magnets with the same magnetic poles.

[0024] The first magnetic ring, the second magnetic ring, the third magnetic ring and the fourth magnetic ring of the screw movement protection device are magnetic when energized, and are non-magnetic when not energized. The protection device can generate a mutual repulsive force between the magnetic ring on the screw nut and the magnetic rings on the front and rear bearing seats at the moment when the ball screw moves out of control. The closer the distance, the greater the repulsive force, which can effectively alleviate the impact force between the screw nut and the front and rear limit devices, thereby protecting the screw nut.

[0025] like Figure 1 As shown, a first magnetic isolation sleeve 5 is provided between the first bearing seat 3 and the first magnetic ring 6, a second magnetic isolation sleeve 8 is provided between the screw nut 9 and the second magnetic ring 7, a third magnetic isolation sleeve 11 is provided between the screw nut 9 and the third magnetic ring 12, and a fourth magnetic isolation sleeve 14 is provided between the second bearing seat 16 and the fourth magnetic ring 13.

[0026] A magnetic isolation sleeve is added between the lead screw nut and the magnetic ring to prevent the magnetism generated by the magnetic body from affecting the lead screw nut; a magnetic isolation sleeve is added between the front and rear bearing seats and the magnetic ring to prevent the magnetism generated by the magnetic ring from affecting the front and rear bearing seats and other parts installed in the surrounding area.

[0027] like Figure 1 As shown, the screw motion protection device also includes a servo motor 1, a servo 21, a motor support seat 4 and a fixing seat 15. The first bearing seat 3 and the servo motor 1 are fixed on the motor support seat 4, and the second bearing seat 16 is fixed on the fixing seat 15. The servo 21 controls the servo motor 1 to drive the ball screw 2 to rotate. The front and rear bearing seats are installed through the motor support seat and the fixing seat, and then the ball screw is installed. The servo motor is installed on the motor support seat. The overall structure is simple and reliable, and the movement is stable.

[0028] like Figure 1 As shown, the screw motion protection device also includes a movable plate 10 and a linear guide 17. The movable plate 10 is connected to the screw nut 9 and moves on the linear guide 17. The screw nut drives the movable plate to move back and forth on the linear guide, and other components are installed on the movable plate to ensure the stability of the movement.

[0029] like Figure 1 As shown, the screw movement protection device also includes a support platform 23, and the motor support base 4, the fixing base 15 and the linear guide rail 17 are respectively fixed on the support platform 23.

[0030] like Figure 1 As shown, the screw motion protection device also includes an energy recovery device 20, which is electrically connected to the servo motor 21 to store excess electrical energy during the movement of the servo motor 1; the energy recovery device 20 energizes the first magnetic ring 6, the second magnetic ring 7, the third magnetic ring 12, and the fourth magnetic ring 13. The use of the energy recovery device is conducive to energy saving and reduces the use cost of the protection device.

[0031] like Figure 1As shown, the screw movement protection device also includes a controller 22, a first induction switch 18 and a second induction switch 19. The first induction switch 18 and the second induction switch 19 are located at both ends of the ball screw 2 and sense the terminal positions of the movement of the two ends of the screw nut 9; the controller 22 is electrically connected to the first induction switch 18, the second induction switch 19, the server 21 and the energy recovery device 20. The use of the controller, the first induction switch and the second induction switch ensures the safety of the screw nut in the normal movement stroke, avoids the collision between the screw nut and the two fixed ends of the ball screw, and protects the screw nut.

[0032] The control method of the screw movement protection device is that when the controller 22 detects that the servo 21 or the servo motor 1 is powered off, the energy recovery device 20 energizes the first magnetic ring 6, the second magnetic ring 7, the third magnetic ring 12 and the fourth magnetic ring 13 to form magnets with the same magnetic polarity, so that when the first magnetic ring 6 and the second magnetic ring 7 approach each other, a repulsive force with the same polarity is generated, or when the third magnetic ring 12 and the fourth magnetic ring 13 approach each other, a repulsive force with the same polarity is generated;

[0033] Alternatively, when the controller 22 detects that the lead screw nut 9 moves to the position of the first induction switch 18 or the second induction switch 19, the energy recovery device 20 energizes the first magnetic ring 6, the second magnetic ring 7, the third magnetic ring 12 and the fourth magnetic ring 13 respectively to form magnets with the same magnetic polarity, so that when the first magnetic ring 6 and the second magnetic ring 7 approach each other, a repulsive force of the same polarity is generated, or when the third magnetic ring 12 and the fourth magnetic ring 13 approach each other, a repulsive force of the same polarity is generated.

[0034] like Figure 2 As shown, the lead screw nut 9 moves to the end of the motor support seat 4, and the second induction switch 19 transmits the induction signal to the controller 22 after sensing the movable plate 10. The controller 22 sends a signal to the energy recovery device 20, and the energy recovery device 20 energizes the first magnetic ring 6 and the second magnetic ring 7 respectively to form magnets with the same magnetic poles, so that the first magnetic ring 6 and the second magnetic ring 7 generate repulsive forces of the same polarity when they approach each other. The closer the distance, the greater the repulsive force, thereby avoiding high-speed collision between the lead screw nut 9 and the first bearing seat 3, and avoiding damage to the lead screw nut 9.

[0035] like Figure 3 As shown, the lead screw nut 9 moves to the end of the fixed seat 15, and the first induction switch 18 transmits the induction signal to the controller 22 after sensing the movable plate 10. The controller 22 sends a signal to the energy recovery device 20, and the energy recovery device 20 energizes the third magnetic ring 12 and the fourth magnetic ring 13 respectively to form magnets with the same magnetic poles, so that the third magnetic ring 12 and the fourth magnetic ring 13 generate repulsive forces of the same polarity when they approach each other. The closer the distance, the greater the repulsive force, thereby avoiding high-speed collision between the lead screw nut 9 and the second bearing seat 16, and avoiding damage to the lead screw nut 9.

[0036] The control method of the screw movement protection device can effectively protect the screw nut from being collided during sudden power failure and normal operation.

[0037] The screw movement protection device installs magnetic rings on the front and rear ends of the screw nut, and also installs magnetic rings at the travel end positions before and after the ball screw. The magnetic rings are energized to become magnetic bodies with the same polarity. When the magnetic body on the screw nut and the magnetic bodies before and after the ball screw approach each other, the two magnetic bodies with the same polarity generate repulsive force on each other to prevent the two from approaching each other, and the closer the distance, the greater the mutual repulsive force, which can effectively buffer the impulse of the screw nut and the fixings at both ends of the ball screw to protect the screw nut.

[0038] In summary, the utility model is as described in the specification and the illustrations, and actual samples are made and tested for multiple times. From the test results, it is proved that the utility model can achieve the expected purpose and its practicality is beyond doubt. The above embodiments are only used to facilitate the description of the content of the utility model, and are not formally limited to it; any equivalent embodiment made by partial changes or modifications made by anyone with common knowledge in the technical field of the utility model without departing from the scope of the technical features and similar features of the utility model, using the technical content disclosed by the utility model, belongs to the protection scope of the utility model.

Claims

1. A screw movement protection device, comprising a ball screw (2) and a screw nut (9) that cooperate with each other, wherein the ball screw (2) is fixed between a first bearing seat (3) and a second bearing seat (16), characterized in that: A first magnetic ring (6) is provided at one end of the first bearing seat (3), a second magnetic ring (7) is provided at one end of the screw nut (9) and a third magnetic ring (12) is provided at the other end, and a fourth magnetic ring (13) is provided at one end of the second bearing seat (16); the first magnetic ring (6) and the second magnetic ring (7) are arranged opposite to each other, and when the two are close to a certain distance, they are energized to form magnets with the same magnetic poles; the third magnetic ring (12) and the fourth magnetic ring (13) are arranged opposite to each other, and when the two are close to a certain distance, they are energized to form magnets with the same magnetic poles; the first bearing seat (3) is fixed on the motor support seat (4), and the second bearing seat (16) is fixed on the fixing seat (15).

2. The screw rod movement protection device according to claim 1 is characterized in that: A first magnetic isolation sleeve (5) is provided between the first bearing seat (3) and the first magnetic ring (6), a second magnetic isolation sleeve (8) is provided between the screw nut (9) and the second magnetic ring (7), a third magnetic isolation sleeve (11) is provided between the screw nut (9) and the third magnetic ring (12), and a fourth magnetic isolation sleeve (14) is provided between the second bearing seat (16) and the fourth magnetic ring (13).

3. The screw rod movement protection device according to claim 1 is characterized in that: It also comprises a servo motor (1) and a server (21), wherein the servo motor (1) is fixed on the motor support seat (4), and the server (21) controls the servo motor (1) to drive the ball screw (2) to rotate.

4. The screw rod movement protection device according to claim 3 is characterized in that: It also includes a movable plate (10) and a linear guide rail (17), wherein the movable plate (10) is connected to the screw nut (9) and moves on the linear guide rail (17).

5. The screw rod movement protection device according to claim 4 is characterized in that: It also includes a support platform (23), on which the motor support seat (4), the fixing seat (15) and the linear guide rail (17) are respectively fixed.

6. The screw rod movement protection device according to claim 3 is characterized in that: It also includes an energy recovery device (20), wherein the energy recovery device (20) is electrically connected to the servo (21) to store excess electrical energy during the movement of the servo motor (1); the energy recovery device (20) supplies electricity to the first magnetic ring (6), the second magnetic ring (7), the third magnetic ring (12) and the fourth magnetic ring (13).

7. The screw rod movement protection device according to claim 6 is characterized in that: The invention also comprises a controller (22), a first inductive switch (18) and a second inductive switch (19), wherein the first inductive switch (18) and the second inductive switch (19) are located at two ends of the ball screw (2) and sense the end positions of the movement of the two ends of the screw nut (9); the controller (22) is electrically connected to the first inductive switch (18), the second inductive switch (19), the server (21) and the energy recovery device (20).

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