High-precision self-lubricating ball screw

Abstract

The utility model provides a high-precision self-lubricating ball screw, and particularly relates to a control structure of a lubricating oil switch of the high-precision self-lubricating ball screw. The device comprises a lead screw shaft, a nut, a ball, a mounting part and an oiling device. The oil storage cavity is formed in the nut, and the oil injection switch composed of the two-way lead screw, the rotary knob, the left-handed nut, the right-handed nut and the blocking plate is arranged, so that precise control over lubricating oil supply is achieved. The position of the blocking plate can be adjusted by rotating the knob, so that the oil inlet hole is opened or closed, and lubrication starting and stopping and oil supply amount are flexibly controlled. Meanwhile, sealing rings are arranged at the two ends of the nut to prevent oil leakage and pollution, a plurality of installation holes are formed in the circumferential direction of the installation part, and connection stability is enhanced. The structure solves the problems of uncontrollable lubrication, frequent maintenance and the like of a traditional ball screw, improves the transmission efficiency, the motion precision and the system reliability, and is suitable for high-precision automatic equipment such as a numerical control machine tool and a robot.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball screw technical field, in particular to a kind of high-precision self-lubricating ball screw. BACKGROUND

[0002] Ball screw is widely used in numerical control machine tool, industrial robot, automation equipment and other high-precision motion control system as precision transmission component.In actual operation process, the friction between ball and helical groove not only can cause energy loss, but also can cause wear and tear, heat, affect transmission accuracy and system life.Therefore, reasonable and controllable lubrication mechanism is the key to guarantee the stable operation of ball screw.

[0003] Ball screw in prior art is mostly open or periodic manual oil injection mode, there is not timely lubrication, lubricating amount is uncontrollable, easy to be contaminated and other problems.Although part of self-lubricating structure is provided with oil storage device, but lack effective control means for lubricating oil supply opportunity and flow, leading to unstable lubrication effect, even oil leakage or excessive lubrication phenomenon. UTILITARY MODEL CONTENTS

[0004] In view of the above-mentioned shortcomings of prior art, the purpose of the utility model is to provide a kind of high-precision self-lubricating ball screw, for solving the problem of uncontrollable lubricating amount in prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides the following technical scheme:

[0006] A kind of high-precision self-lubricating ball screw, including: rotatable screw shaft, its outer circumferential surface is formed first helical groove along axial direction;Nut is screwed on the screw shaft, and its inner circumferential surface is formed second helical groove corresponding to the first helical groove along axial direction;Ball is placed in the ball channel formed by the cooperation of the first helical groove and second helical groove;Mounting portion is arranged at one end of the nut;Oil injection device is provided with oil injection switch and oil inlet hole, and the oil injection switch is used to block or open the oil inlet hole;Oil injection channel is connected with the oil inlet hole and the ball channel.

[0007] The ball is placed in the ball channel formed by the cooperation of the first helical groove and the second helical groove, when the screw shaft rotates, the ball rolls along the helical groove and moves in a cycle, so as to convert the rotary motion into the linear motion of the nut, and precise transmission is realized. An installation part is arranged at one end of the nut, which is used for fixing and connecting external equipment. The oil injection device comprises an oil injection switch and an oil inlet hole, which are used for controlling the injection of lubricating oil. The oil injection device is communicated with the ball channel through an oil injection channel. When lubrication is needed, the oil injection switch is opened, the lubricating oil enters the oil inlet hole and is sent into the ball channel through the oil injection channel, so as to lubricate the ball and the ball channel. The oil injection device and the oil injection channel can provide lubrication for the ball and the helical groove in real time or periodically during operation, which greatly reduces the frictional resistance in the movement process, so that the transmission is more stable and accurate, and the work scene with high position accuracy requirement is met.

[0008] In an embodiment of the present application, the oil injection device further comprises an oil storage cavity arranged on the nut, and an oil injection hole arranged on the installation part and communicated with the oil storage cavity.

[0009] The oil storage cavity is arranged on the nut. The oil storage cavity is used for storing a certain amount of lubricating oil for continuous lubrication of the ball screw during operation. By arranging the oil storage cavity, the frequency of oil injection can be reduced, and the lubricating oil can be stably supplied for a long time, so that the good lubrication state between the ball and the helical groove is ensured. An oil injection hole communicated with the oil storage cavity is arranged on the installation part. The oil injection hole is designed to facilitate the addition of lubricating oil to the oil storage cavity.

[0010] In an embodiment of the present application, the oil injection switch comprises a bidirectional screw rod arranged in the oil storage cavity, a knob located at one end of the bidirectional screw rod, left-handed and right-handed screw nuts threadedly connected to the bidirectional screw rod, and opening and closing assemblies symmetrically arranged on both sides of the bidirectional screw rod.

[0011] The knob is located at one end of the bidirectional screw rod, which is manually rotated by the operator to control the opening or closing of the oil injection switch. With the rotation of the bidirectional screw rod, the left-handed and right-handed screw nuts move in opposite directions along the bidirectional screw rod and drive the opening and closing assemblies to move. When the oil injection channel needs to be opened, the opening and closing assemblies are moved away from the oil inlet hole, so that the lubricating oil can flow from the oil storage cavity into the ball channel. Conversely, when the oil injection channel needs to be closed, the opening and closing assemblies are closed to prevent the lubricating oil from flowing.

[0012] In an embodiment of the present application, the opening and closing assemblies comprise a sealing plate, a first hinged rod hinged at one end of the sealing plate and at the other end of the left-handed screw nut, and a second hinged rod hinged at one end of the sealing plate and at the other end of the right-handed screw nut.

[0013] The plugging plate is used for plugging or opening the oil inlet, and when the left-handed nut and the right-handed nut move in opposite directions along the bidirectional screw rod, the plugging plate is driven to displace by the hinged rod, so that the opening and closing state of the oil inlet hole is controlled.

[0014] In an embodiment of the utility model, the front and rear ends of the nut are both embedded with sealing rings.

[0015] The sealing ring prevents dust, particulate matter and other external pollutants from entering the ball channel and prevents lubricating oil from leaking out of the two ends of the nut.

[0016] In an embodiment of the utility model, the mounting portion is circumferentially provided with a plurality of mounting holes.

[0017] The mounting holes are used for firmly mounting the entire ball screw assembly on a mechanical device through bolts or other fixing members.

[0018] As described above, the high-precision self-lubricating ball screw has the following beneficial effects: the high-precision self-lubricating ball screw provided by the utility model realizes accurate control and flexible adjustment of the lubricating oil supply process through the oil injection switch assembly with a reasonable structure and convenient operation. The oil injection switch includes a linkage mechanism composed of a bidirectional screw rod, a knob, a left-handed nut and a right-handed nut, and a hinged plugging plate. An operator can control the opening or closing of the plugging plate by rotating the knob, thereby realizing on-off control of the oil inlet hole. After the lubricating oil is stored in the oil storage cavity, it is uniformly delivered to the ball channel through the oil injection channel. In combination with accurate switch control, the lubrication is continuous and uniform, the service life of the ball screw is effectively prolonged, the failure rate caused by poor lubrication is reduced, and the precision and reliability of the overall operation of the equipment are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 A structure schematic view of the utility model is shown.

[0020] Fig. 2 A sectional view of the utility model is shown.

[0021] Fig. 3 A structure schematic view of the oil injection device is shown.

[0022] ELEMENT NUMBER EXPLANATION

[0023] 1, screw rod shaft; 2, first helical groove; 3, nut; 4, second helical groove; 5, ball; 6, mounting portion; 7, oil inlet hole; 8, oil injection channel; 9, oil storage cavity; 10, oil injection hole; 11, bidirectional screw rod; 12, knob; 13, left-handed nut; 14, right-handed nut; 15, plugging plate; 16, first hinged rod; 17, second hinged rod; 18, sealing ring; 19, mounting hole. DETAILED DESCRIPTION

[0024] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] Please refer to Figs. 1 to 3 The present application provides a high-precision self-lubricating ball screw, comprising: a rotatable screw shaft 1, the outer circumferential surface of which forms a first helical groove 2 along the axial direction; a nut 3 threaded on the screw shaft 1, the inner circumferential surface of which forms a second helical groove 4 corresponding to the first helical groove 2 along the axial direction; a ball 5 placed in the ball 5 channel formed by the cooperation of the first helical groove 2 and the second helical groove 4; a mounting portion provided at one end of the nut 3; an oil injection device provided with an oil injection switch and an oil inlet hole 7, the oil injection switch being used to block or open the oil inlet hole 7; an oil injection channel 8 connecting the oil inlet hole 7 and the ball 5 channel.

[0026] The ball 5 is placed in the ball 5 channel formed by the cooperation of the first helical groove 2 and the second helical groove 4, when the screw shaft 1 rotates, the ball 5 rolls along the helical groove and moves in a cycle, thereby converting the rotary motion into linear motion of the nut 3, realizing precise transmission. A mounting portion is provided at one end of the nut 3 for fixing and connecting external equipment; the oil injection device includes an oil injection switch and an oil inlet hole 7 for controlling the injection of lubricating oil; the oil injection device is connected to the ball 5 channel through the oil injection channel 8; when lubrication is needed, the oil injection switch is opened, lubricating oil enters from the oil inlet hole 7 and is sent into the ball 5 channel through the oil injection channel 8, lubricating the ball 5 and the ball 5 channel; by providing the oil injection device and the oil injection channel 8, the ball 5 and the helical groove can be lubricated in real time or periodically during operation, greatly reducing the frictional resistance during movement, making the transmission more stable and accurate, and meeting the requirements of high-precision position accuracy in working scenarios.

[0027] The oil injection device further comprises an oil storage cavity 9 provided on the nut 3, and an oil injection hole 10 provided on the mounting portion and connected to the oil storage cavity 9.

[0028] An oil storage cavity 9 is provided on the nut 3. The function of this oil storage cavity 9 is to store a certain amount of lubricating oil for continuous lubrication of the ball 5 screw during operation. By providing the oil storage cavity 9, the frequency of oil injection can be reduced, ensuring that the lubricating oil can be supplied stably for a long time, thereby ensuring good lubrication between the ball 5 and the helical groove. An oil injection hole 10 is provided on the mounting portion and connected to the oil storage cavity 9. The design of the oil injection hole 10 facilitates the addition of lubricating oil to the oil storage cavity 9.

[0029] The oil injection switch comprises a bidirectional screw rod 11 arranged in the oil storage cavity 9, a knob 12 arranged at one end of the bidirectional screw rod 11, a left-handed nut 13 and a right-handed nut 14 threadedly connected to the bidirectional screw rod 11, and an opening and closing assembly symmetrically arranged at both sides of the bidirectional screw rod 11.

[0030] The knob 12 is arranged at one end of the bidirectional screw rod 11 and is manually rotated by an operator to control the opening or closing of the oil injection switch. With the rotation of the bidirectional screw rod 11, the left-handed nut 13 and the right-handed nut 14 move in opposite directions along the bidirectional screw rod 11 and drive the opening and closing assembly to move. When it is required to open the oil injection channel 8, the opening and closing assembly is moved away from the oil inlet hole 7, so that the lubricating oil can flow from the oil storage cavity 9 into the ball 5 channel. Conversely, when it is required to close the oil injection channel 8, the opening and closing assembly is closed to prevent the lubricating oil from flowing.

[0031] The opening and closing assembly comprises a sealing plate 15, a first hinged rod 16 hingedly connected at one end to the sealing plate 15 and at the other end to the left-handed nut 13, and a second hinged rod 17 hingedly connected at one end to the sealing plate 15 and at the other end to the right-handed nut 14.

[0032] The sealing plate 15 is used for plugging or opening the oil inlet. When the left-handed nut 13 and the right-handed nut 14 move in opposite directions along the bidirectional screw rod 11, the sealing plate 15 is driven to displace by the hinged rods, so as to control the opening and closing state of the oil inlet hole 7.

[0033] Sealing rings 18 are embedded at the front and rear ends of the nut 3. The sealing rings 18 prevent dust, particulate matter and other external pollutants from entering the ball 5 channel and prevent the lubricating oil from leaking out of the two ends of the nut 3.

[0034] A plurality of mounting holes 19 are formed in the circumference of the mounting portion. The mounting holes 19 are used to firmly mount the entire ball 5 screw assembly on a mechanical device by means of bolts or other fixing members.

[0035] The above embodiments only exemplarily illustrate the principle and effects of the present application, and are not used to limit the present application. All equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A high-precision self-lubricating ball screw, characterized by, The utility model relates to a ball screw device, comprising: a rotatable screw shaft, the outer circumferential surface of which is formed with a first helical groove in the axial direction; a nut threadedly connected to the screw shaft, the inner circumferential surface of which is formed with a second helical groove corresponding to the first helical groove in the axial direction; a plurality of balls placed in a ball channel formed by the first and second helical grooves; a mounting portion provided at one end of the nut; an oil injection device, which is provided with an oil injection switch and an oil inlet hole, the oil injection switch being used to block or open the oil inlet hole; an oil injection channel, which is in communication with the oil inlet hole and the ball channel.

2. The high-precision self-lubricating ball screw according to claim 1, characterized by: The oil injection device further comprises an oil storage cavity provided on the nut and an oil injection hole provided on the mounting portion and in communication with the oil storage cavity.

3. The high-precision self-lubricating ball screw according to claim 2, characterized in that: The oil injection switch comprises a bidirectional screw rod provided in the oil storage cavity, a knob located at one end of the bidirectional screw rod, a left-handed nut and a right-handed nut threadedly connected to the bidirectional screw rod, and an opening and closing assembly symmetrically provided on both sides of the bidirectional screw rod.

4. The high-precision self-lubricating ball screw according to claim 3, characterized by: The opening and closing assembly comprises a blocking plate, a first hinged rod hingedly connected at one end to the blocking plate and at the other end to the left-handed nut, and a second hinged rod hingedly connected at one end to the blocking plate and at the other end to the right-handed nut.

5. The high-precision self-lubricating ball screw according to claim 1, characterized by: Sealing rings are embedded at both ends of the nut.

6. The high-precision self-lubricating ball screw according to claim 3, characterized by: A plurality of mounting holes are circumferentially provided on the mounting portion.

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