Lead screw drive vibration control system and control method thereof

Abstract

The application provides a screw transmission vibration control system and a control method thereof. The screw transmission vibration control system comprises a movable bearing arranged at a movable end of a screw, a pushing member with one end in contact with the movable bearing, a guide member sleeved on the pushing member, an actuator connected with the other end of the pushing member, a sensor arranged at a lower end of a screw nut, and a controller connected with the sensor and the actuator respectively. The sensor collects vibration signals of the screw and transmits the vibration signals to the controller. The controller controls the actuator to output an acting force to the movable bearing to offset the axial load of the screw caused by external load. The system has the advantages of more accurate and reliable vibration reduction, strong adaptability, reduced harsh requirements on transmission clearance, and reduced machining and assembly detection difficulty of related parts of the ball screw pair.

Description

Technical Field

[0001] The present invention belongs to the fields of mechanical manufacturing and screw vibration control, and in particular relates to a screw transmission vibration control system and a control method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Ball screws are widely used due to their small size, light weight, high efficiency, and high transmission and positioning accuracy. The ball screw is installed in a housing, and the axial movement of the screw relative to the housing is compensated by the anti-backlash gasket. The anti-backlash gasket is installed on the side of the bearing blind hole, and the outer ring of the bearing and the bearing cover are in contact with each other to tighten the position. The assembly diagram is shown in the figure below. Figure 1 As shown in Figure 2, the anti-backlash washer produces an axial preload to compensate for the axial clearance of the screw.

[0004] The axial movement of the screw in the box will increase significantly with the use of the product, which will cause the axial clearance compensation effect of the anti-backlash gasket to decrease until it disappears completely, causing axial vibration in the transmission system.

[0005] In addition, under the action of external impact load, the screw nut drives the screw to move axially, and transmits the impact load to the bearing, anti-backlash gasket and end cover in the axial direction. If there is a gap, continuous oscillation will be generated. These vibrations will have a great adverse effect on the transmission and positioning accuracy of the ball screw pair.

[0006] In summary, the axial clearance of the ball screw pair transmission device has a direct impact on the vibration of the system. After the screw nut is locked, the nut will tend to move along the axial direction of the screw under the action of external load. The screw nut has an axial load acting on the screw. If there is axial clearance in the axial mounting structure of the screw, the screw will produce axial vibration under the action of external load, resulting in inaccurate positioning of the screw nut. Traditional anti-backlash measures can theoretically effectively reduce the oscillation phenomenon of the system, but they are difficult to operate and detect, and troubleshooting is complicated and inefficient. Summary of the Invention

[0007] In order to solve the above problems, the present invention proposes a screw transmission vibration control system and a control method thereof. In order to solve the technical problem that after the screw nut position is locked, the nut will have a tendency to move along the axial direction of the screw under the action of external load, and the screw nut has an axial load acting on the screw. If there is an axial gap in the axial mounting structure of the screw, the screw will produce axial vibration under the action of external load, resulting in inaccurate positioning of the screw nut.

[0008] According to some embodiments, the present invention adopts the following technical solutions:

[0009] A screw drive vibration control system, comprising:

[0010] A movable bearing is provided at the movable end of the screw;

[0011] A pusher, one end of which contacts the floating bearing;

[0012] A guide member, sleeved on the push member;

[0013] an actuator connected to the other end of the pushing member;

[0014] A sensor is provided at the lower end of the lead screw nut; and

[0015] A controller, connected to the sensor and the actuator respectively;

[0016] The sensor collects the vibration signal of the screw and transmits it to the controller. The controller controls the actuator to output a force acting on the floating bearing to offset the axial load of the screw caused by the external load.

[0017] In addition, the screw transmission vibration control system according to the embodiment of the present invention may also have the following additional technical features:

[0018] Preferably, the movable bearing is configured as a combination of a thrust bearing and an angular contact ball bearing, with the actuator disposed on one side of the thrust bearing. The actuator contacts the thrust bearing via a pusher, and the thrust bearing contacts the inner ring of the angular contact ball bearing via a spacer ring. The inner ring of the angular contact ball bearing is connected to the lead screw. The actuator is a piezoelectric ceramic actuator. On one side of the movable bearing, the thrust bearing and the angular contact ball bearing are used in conjunction. A piezoelectric ceramic actuator is assembled on one side of the thrust bearing. The piezoelectric ceramic actuator applies force to the thrust bearing, which applies force to the inner ring of the angular contact ball bearing via a spacer ring. The inner ring of the angular contact ball bearing acts on the lead screw to offset the axial load caused by external loads and achieve accurate positioning of the lead screw nut.

[0019] Preferably, the movable bearing is an angular contact ball bearing, the actuator is connected to the outer ring of the angular contact ball bearing via a pusher, and the inner ring of the angular contact ball bearing is connected to the lead screw. The actuator is a piezoelectric ceramic actuator, using only the angular contact ball bearing on one side of the movable bearing. A piezoelectric ceramic actuator is assembled on one side of the angular contact ball bearing. The piezoelectric ceramic actuator applies force to the outer ring of the angular contact ball bearing, which is then transmitted to the inner ring of the angular contact ball bearing via balls. The inner ring of the angular contact ball bearing then acts on the lead screw to offset the axial load caused by external loads, achieving accurate positioning of the lead screw nut.

[0020] Preferably, the floating bearing is a needle roller and thrust ball combination bearing, the actuator is connected to the needle roller and thrust ball combination bearing via a pusher, and the needle roller and thrust ball combination bearing is connected to the lead screw. The actuator is a piezoelectric ceramic actuator, using a needle roller and thrust ball combination bearing on one side of the floating bearing. A piezoelectric ceramic actuator is assembled on one side of the needle roller and thrust ball combination bearing. The piezoelectric ceramic actuator applies force to the needle roller and thrust ball combination bearing, and through the interaction between the needle roller and thrust ball combination bearing and the lead screw, the axial load caused by external load is offset, achieving accurate positioning of the lead screw nut.

[0021] Preferably, the pushing member is a push plate that slides relatively within the guide member. The push plate is provided to transmit the force of the piezoelectric ceramic actuator to the floating bearing, thereby enabling the piezoelectric ceramic actuator to apply the force to the floating bearing. The floating bearing and the lead screw interact to offset the axial load caused by the external load, thereby achieving accurate positioning of the lead screw nut.

[0022] Preferably, the actuator is a piezoelectric ceramic actuator, which applies force to a floating bearing, which acts on the lead screw to offset the axial load caused by the external load, thereby achieving accurate positioning of the lead screw nut.

[0023] Preferably, the guide member is an oil-free bushing. The oil-free bushing is provided to serve as a guide, ensuring that the push plate moves along the oil-free bushing, thereby acting on the floating bearing. Through the interaction between the floating bearing and the lead screw, the axial load caused by the external load is offset, thereby achieving accurate positioning of the lead screw nut.

[0024] Preferably, the sensor is a vibration sensor. The purpose of the vibration sensor is to monitor in real time whether the screw is moving axially, and then transmit a signal to the controller. The controller processes the signal and controls the piezoelectric ceramic actuator. The piezoelectric ceramic actuator applies a force to the floating bearing. Through the interaction between the floating bearing and the screw, the axial load caused by the external load is offset, thereby achieving accurate positioning of the screw nut.

[0025] Preferably, the actuator further comprises a housing, which is sleeved on the guide member and provided with a rear end cover connected to the actuator. The housing serves to support the oil-free bushing and the piezoelectric ceramic actuator, while the rear end cover serves to limit and secure the piezoelectric ceramic actuator.

[0026] The present invention also provides a method for controlling a screw transmission vibration control system, comprising the following steps:

[0027] Step (1): The sensor collects the screw vibration signal and transmits it to the controller;

[0028] Step (2): The controller processes the signal and compares it with a preset reference threshold to calculate the voltage value delivered to the actuator;

[0029] Step (3): The controller controls the actuator to apply a force opposite to the axial load of the screw to offset the axial load caused by the external load.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention employs a sensor to collect the screw's vibration signals in real time and transmits them to a controller. The controller processes the signals and then controls the actuator to output a force. The actuator applies this force to a pusher, which moves along a guide member to act on a floating bearing. The floating bearing is connected to the screw, thereby offsetting the axial load on the screw caused by external loads and controlling the screw's vibration. This closed-loop vibration control scheme with vibration reduction feedback enables more precise and reliable system vibration reduction, is highly adaptable, and reduces stringent requirements for transmission clearance, thereby reducing the difficulty of machining, assembly, and testing related components of the ball screw pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0033] Figure 1 It is a structural schematic diagram of an existing ball screw pair of the screw drive vibration control system of the present invention;

[0034] Figure 2 is a control system diagram of the screw drive vibration control system of the present invention;

[0035] Figure 3 1 is a schematic structural diagram of a screw drive vibration control system according to embodiment 1 of the present invention;

[0036] Figure 4 2 is a schematic structural diagram of a second embodiment of a screw drive vibration control system according to the present invention;

[0037] Figure 5 It is a structural diagram of Example 3 of the screw drive vibration control system of the present invention.

[0038] Description of reference numerals:

[0039] exist Figure 1-Figure 5In the figure, 01-housing, 02-screw, 03-screw nut, 04-fixed end cover, 05-angular contact ball bearing, 06-guide rod, 07-moving end cover, 08-push plate, 09-oil-free bushing, 10-housing, 11-piezoelectric ceramic actuator, 12-rear end cover, 13-thrust bearing, 14-spacer, 15-needle roller and thrust ball combination bearing, 16-anti-backlash washer, 17-angular displacement sensor. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and should not be understood as limiting the present invention.

[0044] In the present invention, terms such as "fixed connection," "connected," and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meanings of these terms in the present invention based on specific circumstances, and they should not be construed as limitations of the present invention.

[0045] like Figure 1-5As shown, a screw drive vibration control system includes a floating bearing disposed at the floating end of a screw (02). A pusher, one end of which contacts the floating bearing. A guide member, sleeved on the pusher. An actuator, connected to the other end of the pusher. A sensor, disposed at the lower end of the screw nut (03). A controller, respectively, is connected to the sensor and actuator. The sensor collects vibration signals from the screw (02) and transmits them to the controller. The controller controls the actuator to output a force acting on the floating bearing to offset the axial load on the screw (02) caused by external loads.

[0046] Example 1

[0047] like Figure 3 As shown, the floating bearing is configured as a combined bearing of a thrust bearing 13 and an angular contact ball bearing 05. The actuator is disposed on one side of the thrust bearing 13. The actuator contacts the thrust bearing 13 via a pusher. The thrust bearing 13 contacts the inner ring of the angular contact ball bearing 05 via a spacer 14. The inner ring of the angular contact ball bearing 05 is connected to the lead screw 02. On one side of the floating bearing, the thrust bearing 13 and the angular contact ball bearing 05 are used in conjunction. The piezoelectric ceramic actuator 11 is assembled on one side of the thrust bearing 13. The piezoelectric ceramic actuator 11 applies a force to the thrust bearing 13. The thrust bearing 13 applies a force to the inner ring of the angular contact ball bearing 05 via a spacer 14. The inner ring of the angular contact ball bearing 05 acts on the lead screw 02, offsetting the axial load caused by external loads and achieving accurate positioning of the lead screw nut 03.

[0048] Specifically, the screw 02 and the screw nut 03 form a ball screw pair or a threaded screw pair, the angular contact ball bearing 05 is installed at the right end of the screw 02, the right angular contact ball bearing 05 is installed in the box 01, the fixed end cover 05 is installed on the right side of the right angular contact ball bearing 05, and presses the outer ring of the right angular contact ball bearing 05, and the right angular contact ball bearing 05 is a fixed fulcrum.

[0049] In this embodiment, the angular contact ball bearing 05 on the left side of the lead screw 02 is mounted in the floating end cap 07, which is mounted on the housing 01. There is axial clearance between the left angular contact ball bearing 05 and the floating end cap 07, making the left angular contact ball bearing 05 a floating fulcrum. A thrust bearing 13 is mounted to the left side of the left angular contact ball bearing 05, with a spacer 14 installed in between. A push plate 08 is mounted on a piezoelectric ceramic actuator 11, which is mounted on a rear end cap 12, which is mounted on a housing 10. An oil-free bushing 09 is mounted within the housing 10, with one end of the rear end cap 12 extending inside the oil-free bushing 09. The push plate 08 is mounted inside the oil-free bushing 09, with the thrust bearing 13 located on the right side of the push plate 08. The housing 10 is mounted on the floating end cap 07.

[0050] In this embodiment, when the screw nut 03 is positioned, it is affected by the external load and has a tendency to move. The vibration sensor collects the signal, which is analyzed by the computer's built-in software and then given a corresponding voltage input to the piezoelectric ceramic actuator 11. The piezoelectric ceramic actuator 11 outputs a force opposite to the external load, which acts on the thrust bearing 13 through the push plate 08, and is then transmitted to the inner ring of the angular contact ball bearing 05 through the spacer ring 14 to act on the screw 02, thereby offsetting the axial load caused by the external load and achieving accurate positioning of the screw nut 03.

[0051] Example 2

[0052] like Figure 4 As shown, the floating bearing is a needle roller and thrust ball combination bearing 15. The actuator is connected to the needle roller and thrust ball combination bearing 15 via a pusher, and the needle roller and thrust ball combination bearing 15 is connected to the lead screw 02. On one side of the floating bearing, a needle roller and thrust ball combination bearing 15 is used. The piezoelectric ceramic actuator 11 is assembled on one side of the needle roller and thrust ball combination bearing 15. The piezoelectric ceramic actuator 11 applies force to the needle roller and thrust ball combination bearing 15. Through the interaction between the needle roller and thrust ball combination bearing 15 and the lead screw 02, the axial load caused by external load is offset, achieving accurate positioning of the lead screw nut 03.

[0053] Specifically, the floating bearing is an angular contact ball bearing, and the actuator is connected to the outer ring of the angular contact ball bearing via a pusher. The inner ring of the angular contact ball bearing is connected to the lead screw 02. On one side of the floating bearing, only the angular contact ball bearing 05 is used. The piezoelectric ceramic actuator 11 is assembled on one side of the angular contact ball bearing 05. The piezoelectric ceramic actuator 11 applies force to the outer ring of the angular contact ball bearing 05, and transmits this force to the inner ring of the angular contact ball bearing 05 via the ball bearing. The inner ring of the angular contact ball bearing 05 acts on the lead screw 02 to offset the axial load caused by external loads and achieve accurate positioning of the lead screw nut 03.

[0054] Specifically, the screw 02 and the screw nut 03 form a ball screw pair or a threaded screw pair, the angular contact ball bearing 05 is installed at the right end of the screw 02, the right angular contact ball bearing 05 is installed in the box 01, the end cover is installed on the right side of the right angular contact ball bearing 05, and presses the outer ring of the right angular contact ball bearing 05, and the right angular contact ball bearing 05 is a fixed fulcrum.

[0055] In this embodiment, the angular contact ball bearing 05 on the left side of the lead screw 02 is mounted in the floating end cap 07, which is mounted on the housing 01. The left angular contact ball bearing 05 serves as the floating fulcrum. The push plate 08 is mounted on the piezoelectric ceramic actuator 11, which is mounted on the rear end cap 12, which is mounted on the housing 10. The oil-free bushing 09 is mounted within the housing 10, and the rear end cap 12 is mounted inside the oil-free bushing 09. The push plate 08 is mounted inside the oil-free bushing 09. The push plate 08 is on the left side of the left angular contact ball bearing 05 and contacts the outer ring of the left angular contact ball bearing 05. The housing 10 is mounted on the floating end cap 07.

[0056] In this embodiment, when the screw nut 03 is positioned, it is subjected to the external load and has a tendency to move axially, thereby generating vibration. The vibration sensor collects the signal, which is analyzed by the computer's built-in software and then given a corresponding voltage input to the piezoelectric ceramic actuator 11. The piezoelectric ceramic actuator 11 outputs a force opposite to the external load, which acts on the outer ring of the left angular contact ball bearing 05 through the push plate 08, and is then transmitted to the inner ring of the angular contact ball bearing 05 through the rolling element, and then acts on the screw 02, thereby offsetting the axial load caused by the external load and achieving accurate positioning of the screw nut 03.

[0057] Example 3

[0058] like Figure 5 As shown, screw 02 and screw nut 03 form a ball screw pair or threaded screw pair. Angular contact ball bearing 05 is mounted on the right end of screw 02. Right angular contact ball bearing 05 is installed in housing 01. The end cover is installed on the right side of right angular contact ball bearing 05, pressing the outer ring of right angular contact ball bearing 05. Right angular contact ball bearing 05 serves as a fixed fulcrum. The needle roller and thrust ball combination bearing 15 on the left side of screw 02 is installed in floating end cover 07, which is mounted on housing 01. The left needle roller and thrust ball combination bearing 15 can slide axially left and right within floating end cover 07. The left needle roller and thrust ball combination bearing 15 serves as a floating fulcrum. The push plate 08 is installed on the piezoelectric ceramic actuator 11, the piezoelectric ceramic actuator 11 is installed on the rear end cover 12, the rear end cover 12 is installed on the housing 10, the oil-free bushing 09 is installed in the housing 10, the rear end cover 12 is on the inner side of the oil-free bushing 09, the push plate 08 is installed on the inner side of the oil-free bushing 09, the needle roller and thrust ball combination bearing 15 is inside the right side of the push plate 08, and the housing 10 is installed on the floating end cover 07.

[0059] In this embodiment, when the screw nut 03 is positioned, it is subjected to an external load and tends to move. The vibration sensor collects the signal, which is analyzed by the computer's built-in software and then applied to the piezoelectric ceramic actuator 11. The piezoelectric ceramic actuator 11 outputs a force opposite to the external load, which acts on the needle roller and thrust ball combination bearing 15 through the push plate 08 and then on the screw 02, offsetting the axial load caused by the external load and achieving accurate positioning of the screw nut 03. Compared with Examples 1 and 2, this embodiment uses a needle roller and thrust ball combination bearing 15, which can withstand greater axial loads. Example 3 is suitable for working conditions with higher axial loads.

[0060] Example 4

[0061] like Figure 2 As shown, this embodiment provides a method for controlling a screw 02 transmission vibration control system, comprising the following steps:

[0062] Step (1): The sensor collects the vibration signal of the screw 02 and transmits it to the controller.

[0063] Step (2): The controller processes the signal and compares it with a preset threshold value to calculate the voltage value delivered to the actuator.

[0064] Step (3): The controller controls the actuator to apply a force opposite to the axial load of the screw 02 to offset the axial load caused by the external load.

[0065] Specifically, the vibration sensor collects the vibration generated by the ball screw pair or the threaded screw pair, and the vibration sensor transmits the signal to the controller; the controller analyzes and processes the signal, and compares it with the threshold value trained with the reference input, and calculates the voltage value delivered to the actuator; the controller (intelligent controller) controls the intelligent actuator according to the control algorithm, and the controller controls the intelligent actuator to apply a force opposite to the axial load of the screw 02, thereby offsetting the axial load caused by the external load.

[0066] The present invention is based on a system that actively controls the axial vibration of a ball screw or threaded screw using a piezoelectric ceramic actuator and an oil-free bushing 09. During operation, the ball screw or threaded screw rotates while the screw nut 03 moves linearly, subjecting the screw 02 to radial and axial loads. Screw 02 is supported at both ends by bearings: one bearing is fixed, while the other bearing has axial clearance, allowing for movement. When the position of the screw nut 03 needs to be locked, a braking device tightens the motor shaft, locking the screw 02 through the motor shaft so that it cannot rotate, thereby locking the screw nut 03. After the screw nut 03 is locked, the nut tends to move axially along the screw 02 under the action of external loads. The screw nut 03 has an axial load acting on it. If there is axial clearance in the axial mounting structure of the screw 02, the screw 02 will vibrate axially under the action of the external load, causing the screw nut 03 to be mispositioned. The present invention installs a piezoelectric ceramic actuator 11 at the movable end of the screw 02, and through intelligent feedback control, loads axial control force on the screw 02, eliminates the axial clearance of the screw 02, and suppresses the vibration caused by the external load acting on the screw 02, so that the nut screw 02 can be accurately positioned.

[0067] like Figure 2 , wherein the driving system is the system that drives the screw 02 to rotate, that is, the motor. When the driving system stops rotating, the screw 02 stops rotating, and the screw nut 03 remains in position. At this time, under the action of vibration excitation (external load), the screw 02 will move axially. At this time, the angular displacement is sensed by the angular displacement sensor 17 and the signal is transmitted to the intelligent controller (controller). The controller processes the angular electrical signal transmitted by the angular displacement sensor 17, and compares it with the angular displacement, vibration frequency, and voltage relationship of the reference input, and then converts it into a corresponding voltage signal. The intelligent controller transmits the voltage signal corresponding to the angular displacement, vibration frequency, and amplitude to the intelligent actuator (piezoelectric ceramic actuator 11). The piezoelectric ceramic actuator 11 generates a force opposite to the axial load of the screw 02, thereby offsetting the axial load caused by the external load, reducing vibration, and making the positioning of the screw nut 03 more accurate.

[0068] A rack and a gear are set at the lower end of the screw nut 03, and the gear and the rack are meshed. The angular displacement sensor 17 is located on the gear. When the screw nut 03 moves axially, it will drive the rack to move, and the rack drives the gear to rotate, and then the angular displacement sensor 17 collects the angular displacement of the gear rotation. The angular displacement sensor 17 transmits the angle signal to the intelligent controller, and the intelligent controller calculates the vibration amplitude and frequency, and then converts it into a corresponding voltage signal to transmit to the actuator to control the output load of the actuator.

[0069] Technical effects:

[0070] The present invention employs a sensor to collect the vibration signal of the lead screw 02 in real time and transmits the collected vibration signal to a controller. The controller processes the signal and then controls the actuator to output a force. The actuator applies the force to the pusher, which moves along the guide member to act on the floating bearing. The floating bearing is connected to the lead screw 02, thereby offsetting the axial load on the lead screw 02 caused by external loads, thereby controlling the vibration of the lead screw 02. This closed-loop vibration control solution with vibration reduction effect feedback can achieve more accurate and reliable system vibration reduction, has strong adaptability, and can also reduce the stringent requirements for transmission clearance, thereby reducing the difficulty of processing, assembly and testing related components of the ball screw pair.

[0071] Specifically, the present invention acts on the lead screw 02 through a piezoelectric ceramic actuator 11, and the force output by the piezoelectric ceramic actuator 11 offsets the axial load on the lead screw 02 caused by the external load. The thrust bearing 13 is used in combination with the angular contact ball bearing 05, and the push plate 08 or the thrust bearing 13 can achieve axial sliding in the oil-free bushing 09. The piezoelectric ceramic actuator 11 applies an axial force to the combination of the thrust bearing 13 and the angular contact ball bearing 05, thereby achieving active control of the axial vibration of the lead screw 02. The piezoelectric ceramic actuator 11 applies an axial force to the angular contact ball bearing 05, thereby achieving active control of the axial vibration of the lead screw 02. The combination of the needle roller and thrust ball bearing 15 and the push plate 08 can achieve axial sliding in the oil-free bushing 09. The piezoelectric ceramic actuator 11 applies an axial force to the needle roller and thrust ball bearing 15, thereby achieving active control of the axial vibration of the lead screw 02. Compared with the existing method of using an anti-backlash washer 16, the vibration reduction effect is better.

[0072] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0073] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A screw drive vibration control system, characterized in that ,include: A movable bearing is provided at the movable end of the screw; A pusher, one end of which contacts the floating bearing; A guide member, sleeved on the push member; an actuator connected to the other end of the pushing member; A sensor is provided at the lower end of the lead screw nut; and A controller, connected to the sensor and the actuator respectively; Among them, the sensor collects the vibration signal of the screw and transmits it to the controller, and the controller controls the actuator to output a force acting on the floating bearing to offset the axial load of the screw caused by the external load; the pushing member is a push plate, and the guide member adopts an oil-free bushing. The push plate slides relatively in the guide member to ensure that the push plate moves in the oil-free bushing along the direction of the oil-free bushing, and then acts on the floating bearing. Through the action of the floating bearing and the screw, the axial load caused by the external load is offset, and the accurate positioning of the screw nut is achieved.

2. The screw drive vibration control system according to claim 1, characterized in that: The floating bearing is configured as a combined bearing of a thrust bearing and an angular contact ball bearing. The actuator is configured on one side of the thrust bearing. The actuator contacts the thrust bearing through a pushing member. The thrust bearing contacts the inner ring of the angular contact ball bearing through a spacer ring. The inner ring of the angular contact ball bearing is connected to the lead screw.

3. The screw drive vibration control system according to claim 1, characterized in that: The floating bearing is an angular contact ball bearing. The actuator is connected to the outer ring of the angular contact ball bearing through a pushing member, and the inner ring of the angular contact ball bearing is connected to the lead screw.

4. The screw drive vibration control system according to claim 1, characterized in that: The floating bearing is a needle roller and thrust ball combination bearing. The actuator is connected to the needle roller and thrust ball combination bearing through a pusher, and the needle roller and thrust ball combination bearing is connected to the screw.

5. The screw drive vibration control system according to claim 1, characterized in that: The actuator is a piezoelectric ceramic actuator.

6. The screw drive vibration control system according to claim 1, characterized in that: The sensor is an angular displacement sensor.

7. The screw drive vibration control system according to claim 1, characterized in that: It also includes a shell, which is sleeved on the guide member. The shell is provided with a rear end cover, and the rear end cover is connected to the actuator.

8. A control method for a screw transmission vibration control system, based on the screw transmission vibration control system according to any one of claims 1 to 7, characterized in that: The steps include: Step (1): The sensor collects the screw vibration signal and transmits it to the controller; Step (2): The controller processes the signal and compares it with a preset reference threshold to calculate the voltage value delivered to the actuator; Step (3): The controller controls the actuator to apply a force opposite to the axial load of the screw to offset the axial load caused by the external load.

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