High-precision ball screw pair

Abstract

The utility model relates to the technical field of ball screws and discloses a high-precision ball screw pair which comprises a screw body, a sliding groove is formed in the surface of the screw body, oil injection assemblies are evenly arranged in the sliding groove, and a pressure relief assembly is arranged on the left side of the screw body. The ball screw pair has the advantages that through the oil spraying assembly in the sliding groove, when the nut operates, the rolling bead in the groove in the inner wall touches the movable block and extrudes the telescopic rod A and the spring A, sleeve lubricating oil is sprayed out through the oil outlet hole of the fixed seat, the phenomenon of dry friction is avoided, and therefore the service life of the ball screw pair is greatly prolonged; meanwhile, when the oil pressure in the screw rod main body is suddenly increased due to the fact that the movable block is blocked or other reasons occur, the oil pressure can push a baffle, the baffle drives a telescopic rod B to overcome the elastic force of a spring B to move, redundant lubricating oil flows out of a drainage pipe, the situation that the screw rod main body and an oil injection assembly are impacted by too high oil pressure is avoided, and therefore the service life is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a high-precision ball screw pair. Background Art

[0002] As a key transmission component, ball screw pairs are widely used in various types of precision machinery and equipment, such as CNC machine tools, industrial robots, and automated production lines. In these high-precision application scenarios, the performance of ball screw pairs is directly related to the operating accuracy, stability, and service life of the entire equipment.

[0003] The applicant found that the Chinese patent disclosed "a high-precision ball screw" and its publication (announcement) number is "CN 210715798 U", this patent is mainly characterized by reasonable design and easy operation. The groove handle provided on the outside of the protective cover facilitates the operator to drive the protective cover to rotate. The groove handle is humanized in design. The oil storage tube can store a certain amount of lubricating oil for lubrication operation for a period of time. The first oil outlet provided under the oil storage tube and the second oil outlet provided on the corresponding screw body facilitate the discharge of the lubricating oil in the oil storage tube. The diameters of the second oil outlet and the first oil outlet are small, so not too much will leak out. They only play a lubricating role, which facilitates the sliding of the ball on it, reduces the wear of the screw body caused by friction in a dry state, ensures the precision during work, and further protects the screw body under the action of lubricating oil, effectively prolongs the service life, and ensures that the precision of processing will not be affected in the case of wear, which will affect the processing operation. However, if the device continues to discharge oil, it will cause excessive lubrication of the screw body, which will have an adverse effect on the equipment. At the same time, the device has no safety device for the storage of lubricating oil, which may damage the equipment, thereby reducing the service life of the equipment. For this reason, we propose a high-precision ball screw pair. Utility Model Content

[0004] The purpose of the utility model is to provide a high-precision ball screw pair.

[0005] To achieve the above object, the utility model provides the following technical solution: a high-precision ball screw pair, comprising a screw body, a surface of the screw body having sliding grooves, the interior of the sliding grooves being evenly provided with oil spray assemblies, and a pressure relief assembly being provided on the left side of the screw body;

[0006] The oil injection assembly includes a sleeve, a movable block, an A telescopic rod, an A spring and a fixed seat. A hole is provided inside the sliding groove. The sleeve is fixed inside the hole. The fixed seat is fixedly connected to the bottom of the sleeve. The A telescopic rod is fixedly connected to the top of the fixed seat. The A spring is sleeved on the outer surface of the A telescopic rod. The movable block is fixedly connected to the front side of the A telescopic rod. The pressure relief assembly includes a baffle, a B telescopic rod, a B spring, a drain pipe and a pressure relief pipe. One side of the pressure relief pipe is fixedly connected to the drain pipe. The baffle, B telescopic rod and B spring are all located inside the pressure relief pipe. The baffle is located on the front side of the drain pipe. The B telescopic rod is fixedly connected to one side of the baffle. The B spring is sleeved on the outer surface of the B telescopic rod.

[0007] As a further solution of the present invention: oil outlet holes are evenly penetrated on the surface of the fixing seat.

[0008] As a further solution of the present invention: the rear side of the pressure relief pipe is connected to a rear cover by means of threads, and the interior of the rear cover is connected to one side of the telescopic rod B.

[0009] As a further solution of the present invention: a nut is sleeved on the outer surface of the screw rod body, a groove is opened on the inner wall of the nut, the groove corresponds to the sliding groove, and a rolling ball is installed inside the groove.

[0010] As a further solution of the present invention: an elastic rubber sleeve is provided on one side of the drainage pipe.

[0011] As a further solution of the present invention: an oil inlet pipe is provided on the right side of the screw rod body, two clips are evenly provided on the outside of the oil inlet pipe, and the surface of the clips is provided with threads, and a clamp is connected through the threads.

[0012] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The utility model sets an oil spray assembly in the sliding groove of the screw body. When the nut is running, the rolling ball in the inner wall groove presses the movable block, causing the movable block to squeeze the telescopic rod A and the spring A, thereby prompting the lubricating oil in the sleeve to spray out through the oil outlet hole on the surface of the fixed seat, thereby avoiding dry friction between the screw and the rolling ball due to insufficient lubrication, effectively reducing wear and extending the service life of the ball screw pair, while ensuring high transmission precision;

[0014] 2. The utility model provides a pressure relief assembly on the left side of the screw body. When the oil pressure inside the screw body is too high due to the jamming of the movable block or other reasons, the oil pressure will squeeze the baffle, causing the baffle to overcome the elastic force of the B spring and drive the B telescopic rod to move, thereby allowing excess lubricating oil to be discharged from the drain pipe, thereby avoiding damage to the screw body, the oil injection assembly and the entire ball screw pair caused by excessive oil pressure, and ensuring the stability of equipment operation and service life.

[0015] Other advantages, objectives and features of the present invention will be described in part in the following description and will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of A in the middle;

[0018] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0019] Figure 4 for Figure 3 Schematic diagram of B in the middle;

[0020] Figure 5 This is a schematic diagram of the sliding groove in the embodiment of the utility model;

[0021] Figure 6 for Figure 5 Schematic diagram of C in the figure.

[0022] In the figure: 1. Screw body; 11. Sliding groove; 2. Oil injection assembly; 21. Sleeve; 22. Movable block; 23. Telescopic rod A; 24. Spring A; 25. Fixed seat; 2501. Oil outlet hole; 3. Pressure relief assembly; 31. Baffle; 32. Telescopic rod B; 33. Spring B; 34. Back cover; 35. Drain pipe; 3501. Elastic rubber sleeve; 36. Pressure relief pipe; 5. Nut; 51. Rolling ball; 6. Oil inlet pipe; 61. Clip; 62. Clamp. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0024] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see the attached Figure 1 -Attached Figure 6 The utility model relates to a high-precision ball screw pair, comprising a screw body 1, the surface of which is designed with a sliding groove 11 for the sliding of the nut 5, and an evenly distributed oil injection assembly 2 inside the sliding groove 11, the oil injection assembly 2 consisting of a sleeve 21, a sleeve 21, a movable block 22, an A telescopic rod 23, an A spring 24 and a fixed seat 25, the sleeve 21 being firmly fixed in a specially provided hole inside the sliding groove 11, the fixed seat 25 being fixedly connected to the bottom of the sleeve 21, and the surface of the fixed seat 25 being evenly penetrated with oil outlet holes 2501, the A telescopic rod 23 being vertically fixedly connected to the top of the fixed seat 25, and the A spring 24 tightly sleeved on its outer surface providing just the right elastic feedback for this telescopic action, and the movable block 22 being fixedly connected to the front side of the A telescopic rod 23, when the nut 5 is running, the rolling ball 51 in the groove on the inner wall of the nut 5 touches it, and the movable block 22 can sense the pressure and quickly squeeze the A telescopic rod 23 The oil is then pushed out of the oil pipe 32 and the oil outlet 2501 of the fixing seat 25 to ensure that the screw body 1 and the rolling ball 51 are always in a well-lubricated state. At the same time, the left side of the screw body 1 is also equipped with a pressure relief assembly 3, which includes a baffle 31, a B telescopic rod 32, a B spring 33, a discharge pipe 35 and a pressure relief pipe 36. One side of the pressure relief pipe 36 is tightly fixedly connected to the discharge pipe 35. At the same time, the baffle 31, the B telescopic rod 32 and the B spring 33 are orderly arranged inside the pressure relief pipe 36. The baffle 31 is located at the front side of the discharge pipe 35. The B telescopic rod 32 is firmly fixedly connected to one side of the baffle 31 to provide stable support for the movement of the baffle 31. The B spring 33 is sleeved on the outer surface of the B telescopic rod 32. Once the oil pressure rises abnormally, the oil pressure will squeeze the baffle 31. When the elastic force of the B spring 33 is overcome, the B telescopic rod 32 is driven to move, thereby starting the pressure relief process in time to avoid damage to the equipment.

[0026] In the first embodiment, the surface of the fixing base 25 is uniformly penetrated with oil outlet holes 2501, the rear side of the pressure relief pipe 36 is connected to the rear cover 34 by a threaded manner, and the interior of the rear cover 34 is connected to one side of the telescopic rod B 32;

[0027] Specifically, the surface of the fixing seat 25 is evenly penetrated with oil holes 2501, and the aperture of the oil holes 2501 is moderate in size, which can ensure that when the movable block 22 is pressurized to trigger the oil injection action, the lubricating oil can be sprayed out smoothly and in sufficient quantity to meet the immediate lubrication needs between the screw body 1 and the rolling ball 51, and avoid dry friction due to insufficient lubrication, and prevent excessive oil output, resulting in waste of lubricating oil and other negative effects that may be caused. At the same time, the rear side of the pressure relief pipe 36 is connected to the rear cover 34 by a threaded connection. This threaded connection method is both convenient and reliable. During the equipment assembly stage, the operator can use simple tools and follow the standard thread screwing process to easily The rear cover 34 is installed to the rear side of the pressure relief pipe 36 to ensure that the various components fit tightly together, forming a closed and stable pressure relief space, providing a reliable placement environment for the internal baffle 31, B telescopic rod 32 and B spring 33. At the same time, the interior of the rear cover 34 is connected to one side of the B telescopic rod 32, so that it can not only provide a stable support point for the B telescopic rod 32, but also ensure the sealing of the connection part, preventing lubricating oil from leaking from the connection between the rear cover 34 and the B telescopic rod 32, ensuring that the pressure relief component 3 can efficiently start the pressure relief process when responding to an abnormal increase in oil pressure, effectively protecting the ball screw pair and the safe operation of the entire equipment, and avoiding irreparable damage to the equipment due to oil pressure out of control.

[0028] In the second embodiment, a nut 5 is sleeved on the outer surface of the screw body 1, and a groove is formed on the inner wall of the nut 5. The groove corresponds to the sliding groove 11, and a rolling ball 51 is installed inside the groove. An elastic rubber sleeve 3501 is provided on one side of the discharge pipe 35. An oil inlet pipe 6 is provided on the right side of the screw body 1. Two clips 61 are evenly provided on the outer side of the oil inlet pipe 6. The surface of the clip 61 is provided with a thread, and a clamp 62 is connected through the thread.

[0029] Specifically, a nut 5 is sleeved on the outer surface of the screw body 1, and the cooperation between the two is the key to realizing the transmission function of the ball screw pair. A groove is provided on the inner wall of the nut 5, which accurately corresponds to the sliding groove 11 on the screw body 1. This corresponding relationship ensures that the rolling ball 51 has a stable and appropriate track during operation. When the screw body 1 rotates, the nut 5 produces relative motion. The rolling ball 51 installed inside the groove rolls forward between the groove and the sliding groove 11, effectively reducing the friction between the screw body 1 and the nut 5, making the transmission smoother. An elastic rubber sleeve 3501 is provided on one side of the discharge pipe 35. Under normal operating conditions, the elastic rubber sleeve 3501 can serve as a protective barrier to prevent external dust, impurities and other foreign matter from entering the pressure relief pipe 36 through the discharge pipe 35 in the reverse direction, avoiding the baffle 31 and B extension in the pressure relief assembly 3. The retracted rod 32 and the B spring 33 are damaged, thereby affecting the normal performance of the pressure relief function. When the oil pressure suddenly increases and pressure relief is required, the elastic rubber sleeve 3501 can flexibly adapt to the rapid outflow of lubricating oil by virtue of its good elasticity, and will not hinder the discharge process. At the same time, an oil inlet pipe 6 is provided on the right side of the screw body 1, and two clips 61 are evenly provided on the outside of the oil inlet pipe 6. The surfaces of these two clips 61 are provided with threads, and a clamp 62 is connected through the threads. When an external lubricating oil source needs to be connected, the clamp 62 is loosened to facilitate the insertion of the oil pipe joint, and then the clamp 62 is tightened to tightly clamp the oil pipe joint to ensure a firm connection and prevent lubricating oil leakage. This design not only facilitates the injection operation of the lubricating oil, but also ensures the reliability of the connection between the oil inlet pipe 6 and the external oil source, providing a strong guarantee for the continuous and stable lubrication of the ball screw pair.

[0030] Working principle:

[0031] First, when the screw body 1 starts to work, the nut 5 sleeved on the outer surface of the screw body 1 will produce relative movement. Since the inner wall of the nut 5 is provided with a groove that precisely corresponds to the sliding groove 11 on the screw body 1, and a rolling ball 51 is installed inside the groove, the rolling ball 51 rolls forward between the groove and the sliding groove 11, effectively reducing the friction between the screw body 1 and the nut 5, ensuring smooth transmission. In this process, when the nut 5 is running, the rolling ball 51 in the groove on the inner wall of the nut 5 will touch the sliding groove 11. The movable block 22 of the inner oil spray assembly 2, after being squeezed, quickly squeezes the A telescopic rod 23 connected to it and the A spring 24 sleeved on the outer surface of the A telescopic rod 23. The A spring 24 provides just the right elastic feedback, and the compression action of the A telescopic rod 23 causes the lubricating oil stored in the sleeve 21 to be sprayed out smoothly and in sufficient quantity through the oil outlet holes 2501 uniformly passing through the surface of the fixed seat 25. The sprayed lubricating oil is accurately sprayed on the contact part between the screw body 1 and the rolling ball 51, meeting the immediate lubrication needs between the two. In order to avoid dry friction caused by insufficient lubrication, the wear is effectively reduced, the service life of the ball screw pair is extended, and the high precision of the transmission is ensured. At the same time, the pressure relief assembly 3 equipped on the left side of the screw body 1 is always on standby. Once the movable block 22 is stuck or other sudden reasons cause the internal oil pressure of the screw body 1 to be too high, the oil pressure will squeeze the baffle 31 in the pressure relief assembly 3. The baffle 31 overcomes the elastic force of the B spring 33 under the action of the oil pressure and drives the B telescopic rod 32 connected thereto to move. At this time, the excess lubrication The oil will flow out from the discharge pipe 35 tightly connected to one side of the pressure relief pipe 36. The elastic rubber sleeve 3501 set on one side of the discharge pipe 35 serves as a protective barrier during normal operation to prevent external dust, impurities and other foreign matter from entering the pressure relief pipe 36 through the discharge pipe 35 in reverse, thereby avoiding damage to the baffle 31, the B telescopic rod 32 and the B spring 33. During pressure relief, the elastic rubber sleeve 3501 can flexibly adapt to the rapid outflow of the lubricating oil with its own good elasticity, and will not hinder the discharge process. At this point, the entire work process ends.

[0032] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0035] For those skilled in the art, it is possible to make various changes, modifications, substitutions and variations to these embodiments without departing from the principles and spirit of the present invention, and they still fall within the scope of protection of the present invention.

Claims

1. A high-precision ball screw pair, comprising a screw body (1), wherein a sliding groove (11) is provided on the surface of the screw body (1), and characterized in that: The interior of the sliding groove (11) is evenly provided with an oil spray assembly (2), and the left side of the screw rod body (1) is provided with a pressure relief assembly (3); The oil injection assembly (2) comprises a sleeve (21), a movable block (22), an A telescopic rod (23), an A spring (24) and a fixed seat (25); a hole is provided inside the sliding groove (11); the sleeve (21) is fixed inside the hole; the fixed seat (25) is fixedly connected to the bottom of the sleeve (21); the A telescopic rod (23) is fixedly connected to the top of the fixed seat (25); the A spring (24) is sleeved on the outer surface of the A telescopic rod (23); the movable block (22) is fixedly connected to the front side of the A telescopic rod (23); The pressure relief assembly (3) includes a baffle (31), a B telescopic rod (32), a B spring (33), a discharge pipe (35) and a pressure relief pipe (36). One side of the pressure relief pipe (36) is fixedly connected to the discharge pipe (35). The baffle (31), the B telescopic rod (32) and the B spring (33) are all located inside the pressure relief pipe (36). The baffle (31) is located in front of the discharge pipe (35). The B telescopic rod (32) is fixedly connected to one side of the baffle (31). The B spring (33) is sleeved on the outer surface of the B telescopic rod (32).

2. A high-precision ball screw pair according to claim 1, characterized in that: The surface of the fixing seat (25) is evenly penetrated with oil outlet holes (2501).

3. The high-precision ball screw pair according to claim 1, characterized in that: The rear side of the pressure relief pipe (36) is connected to a rear cover (34) by means of a thread, and the interior of the rear cover (34) is connected to one side of the B telescopic rod (32).

4. The high-precision ball screw pair according to claim 1, characterized in that: The outer surface of the screw rod body (1) is sleeved with a nut (5), the inner wall of the nut (5) is provided with a groove, the groove corresponds to the sliding groove (11), and a rolling ball (51) is installed inside the groove.

5. The high-precision ball screw pair according to claim 1, characterized in that: An elastic rubber sleeve (3501) is provided on one side of the drainage pipe (35).

6. The high-precision ball screw pair according to claim 1, characterized in that: An oil inlet pipe (6) is provided on the right side of the screw rod body (1), and two clips (61) are evenly provided on the outside of the oil inlet pipe (6). The surface of the clips (61) is provided with threads, and a clamp (62) is connected through the threads.

Images