Heavy-load linear bearing

Abstract

A heavy-load linear bearing comprises an outer ring sleeve, the center of the outer ring sleeve is provided with a sliding channel which is arranged in the axial direction in a penetrating mode and used for installing a shaft body, and the heavy-load linear bearing is characterized in that a circulating groove which is through in the axial direction of the outer ring sleeve is formed in the side wall of the outer ring sleeve, and a plurality of balls which make contact with one another are contained in the circulating groove; the two ends of the outer ring sleeve are provided with steering gears used for enabling the balls to circularly move in the circulating grooves, the circulating grooves are provided with semi-open grooves communicating with the sliding channels, and the balls make contact with the shaft body installed in the sliding channels through the semi-open grooves. The device can run for a long time in medium-load and heavy-load scenes, the failure rate and the repair rate in use are reduced, the daily maintenance difficulty of operators is reduced, and the safety of subsequent production is also improved.

Description

Technical Field

[0001] The invention relates to the technical field of linear bearings, and in particular to a heavy-load linear bearing. Background Art

[0002] At present, linear bearings are mechanical components used to achieve linear motion. Through the cyclic motion of rolling elements, sliding friction is converted into rolling friction, thereby significantly reducing motion resistance. It is usually used in conjunction with optical axes or linear axes and is widely used in scenarios that require high-precision, low-friction linear motion. The structure of a linear bearing usually consists of an outer cylinder, rolling elements, a cage, and other structures. The outer cylinder is a cylindrical shell, usually made of metal or engineering plastics. The rolling elements contain multiple rows of balls or rollers, which are evenly distributed through the cage; the cage ensures that the rolling elements circulate and roll during the movement to avoid mutual collision. When the linear bearing moves along the optical axis, the internal rolling elements roll between the shaft and the bearing to reduce the contact area and friction resistance. The rolling elements form a cyclic path inside the bearing through the guidance of the cage to achieve continuous rolling. Since the rolling friction is much smaller than the sliding friction, the linear bearing can complete linear motion with low resistance and high precision. The rolling friction of the shaft body makes the movement smoother, which is suitable for high-speed or frequent start-stop scenarios.

[0003] In the Chinese invention patent with application number CN202510132454.2 and application date 2025-02-06, a new type of linear bearing retainer is recorded, which "includes an outer ring and a steel ball installed on the inner side of the outer ring, a plurality of arc-shaped retainers are installed on the inner side of the outer ring, the steel ball is located on the inner side of the arc-shaped retainer, and grooves and raised ribs are respectively provided on both sides of the arc-shaped retainer. A plurality of arc-shaped retainers are interlocked to form a complete retainer, and the front and rear ends of the retainer are fixed by retainer fixing rings, and the arc-shaped retainer is made of nylon."

[0004] The problem with the prior art is that the load capacity of the linear bearing is limited due to the presence of the cage, because a large part of the force is transmitted to the cage. When selecting a linear bearing, the load capacity of the cage needs to be considered, especially in the case of medium and heavy loads. If used for a long time, the cage will be damaged earlier than other components, which will lead to the occurrence of unstable conditions such as jamming, shaking, and swaying, thereby affecting the performance and stability of the linear bearing. Summary of the invention

[0005] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a heavy-load linear bearing. While eliminating the retaining frame, multiple sets of circulation grooves are opened inside the outer ring sleeve, and the balls are in contact with the outside of the shaft body. The outer ring sleeve bears the load of the shaft body through the balls.

[0006] The technical solution adopted by the present invention to solve its technical problems: This heavy-duty linear bearing includes an outer ring sleeve. A sliding channel that runs through axially and is used for installing a shaft body is provided in the center of the outer ring sleeve. It is characterized in that: a circulating groove that runs through in the axial direction of the outer ring sleeve is provided in the side wall of the outer ring sleeve. A number of mutually contacting balls are accommodated inside the circulating groove. Steering devices for enabling the balls to circulate in the circulating groove are installed at both ends of the outer ring sleeve. A semi-open groove that communicates with the sliding channel is provided on the circulating groove. The balls contact the shaft body installed inside the sliding channel through the semi-open groove.

[0007] For further improvement, a gasket for making the steering device closely adhere to the circulating groove is detachably connected to the inner wall of the outer ring sleeve.

[0008] For further improvement, the circulating groove includes a proximal groove and a distal groove that run through axially along the outer ring sleeve. The proximal groove is closer to the sliding channel in the radial position than the distal groove. The semi-open groove is provided on the proximal groove.

[0009] For further improvement, the line connecting the centers of the proximal groove and the distal groove forms an α angle with the line connecting the center of the proximal groove and the outer ring sleeve. The range of the α angle is 120° to 180°. The cage and the outer ring sleeve are integrally arranged, so that the available space of the circulating groove is increased, and a larger α angle can be set. The increase of the α angle enables this linear bearing to be provided with at least twice as many circulating grooves as a common linear bearing, greatly increasing the load-bearing capacity of the linear bearing.

[0010] For further improvement, the steering device includes an annular sealing sleeve fixedly installed at the ends of the proximal groove and the distal groove. A U-shaped reversing groove that communicates the proximal groove and the distal groove is provided inside the annular sealing sleeve. The balls enter and exit the proximal groove and the distal groove through the U-shaped reversing groove.

[0011] For further improvement, a positioning post is fixedly connected to the steering device, and a positioning hole is provided on the outer ring sleeve. The steering device is installed on the outer ring sleeve through the mutual cooperation of the positioning post and the positioning hole.

[0012] For further improvement, a detection piece for detecting the wear degree of the balls is installed on the outer ring sleeve. The detection piece includes a mounting seat fixedly installed on the outside of the outer ring sleeve. A transmission inner cavity is provided inside the mounting seat. A transmission plate that is hermetically slidably connected to the transmission inner cavity is provided at the bottom of the transmission inner cavity. The space between the top of the transmission inner cavity and the transmission plate is filled with hydraulic oil. A lifting groove leading to the transmission inner cavity is provided at the top of the mounting seat. The diameter of the lifting groove is smaller than the diameter of the transmission inner cavity. The transmission plate can push the hydraulic oil into the lifting groove by rising. A pressure rod that passes through the bottom of the mounting seat and the outer ring sleeve is fixedly installed on the transmission plate. The bottom of the pressure rod is semi-circular and presses against the space between two balls. The balls push the pressure rod to rise when circulating.

[0013] For further improvement, a lifting rod is slidably connected inside the lifting groove and passes through the top of the mounting seat. A turntable located at the top of the mounting seat is fixedly installed at the top of the lifting rod. A spiral groove is provided on the outer side of the lifting rod, and a guiding convex block matching the spiral groove is provided on the inner wall of the lifting groove. The lifting rod rotates during the lifting process through the cooperation of the spiral groove and the guiding convex block.

[0014] For further improvement, an indicating sleeve is rotatably connected to the outside of the mounting seat. A key block is installed on the inner wall of the indicating sleeve. A key groove matching the key block is provided on the outer side of the turntable. The turntable drives the indicating sleeve to rotate through the cooperation of the key groove and the key block. A spring is provided inside the indicating sleeve, with one end pressing against the top of the inner wall of the indicating sleeve and the other end pressing against the top of the turntable. A marking member fixedly connected to the indicating sleeve is provided on the outside of the mounting seat. The indicating sleeve can drive the marking member to scribble and mark the movement track on the outside of the mounting seat by rotation.

[0015] For further improvement, an annular clamping groove is provided on the inner wall of the indicating sleeve, and an annular plate matching the annular clamping groove is fixedly installed on the outside of the mounting seat. The indicating sleeve is rotatably connected to the mounting seat through the annular clamping groove and the annular plate.

[0016] For further improvement, the marking member includes a wiping plate with one end closely attached to the outside of the indicating sleeve. A placing groove facing the indicating sleeve and inclined downward is provided on the wiping plate. The placing groove leads to the outside of the indicating sleeve. A wiping piece relying on gravity to closely attach to the outside of the indicating sleeve is placed inside the placing groove. Graphite or pigment is mixed inside the wiping piece.

[0017] The beneficial effects of the present invention are as follows: It greatly improves the load-bearing capacity of the linear bearing, can operate for a long time in medium-load and heavy-load scenarios, reduces the failure rate and repair rate during use, reduces the daily maintenance difficulty of operators, and also improves the safety of subsequent production. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is this Figure 1 partial cross-sectional view;

[0020] Figure 3 is a schematic structural diagram of the circulation groove, steering device, and semi-open groove in the present invention;

[0021] Figure 4 is a schematic structural diagram of the proximal groove and distal groove in the present invention;

[0022] Figure 5 is a schematic structural diagram of the α angle in the present invention;

[0023] Figure 6 is a schematic structural diagram of the annular sealing sleeve and U-shaped reversing groove in the present invention;

[0024] Figure 7 Structural schematic diagram of the detection component in the present invention;

[0025] Figure 8 Axonometric view of the detection component in the present invention;

[0026] Figure 9 is Figure 8 axonometric sectional view of.

[0027] Explanation of reference numerals: outer ring sleeve 1, sliding channel 2, circulation groove 3, proximal groove 3-1, distal groove 3-2, ball 4, steering gear 5, annular sealing sleeve 5-1, U-shaped reversing groove 5-2, semi-open groove 6, gasket 7, detection component 8, mounting seat 8-1, transmission inner cavity 8-2, transmission plate 8-3, lifting groove 8-4, pressing rod 8-5, lifting rod 8-6, turntable 8-7, spiral groove 8-8, guiding convex block 8-9, indicating sleeve 8-10, key block 8-11, key groove 8-12, spring 8-13, marking component 8-14, wiping plate 8-14a, placing groove 8-14b, wiping piece 8-14c, annular clamping groove 8-15, annular plate 8-16. Detailed implementation manners

[0028] The following provides the preferred specific implementation manners of the present invention in conjunction with the accompanying drawings. What is disclosed is only the preferred specific implementation manners of the present invention. Certainly, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

[0029] Refer to attached Figure 1 ~attached Figure 9: In this embodiment, this heavy-duty linear bearing includes an outer ring sleeve 1. A sliding channel 2 that penetrates along the axial direction and is used for installing a shaft body is provided on the outer ring sleeve 1. The outer ring sleeve 1 is sleeved on the outside of the shaft body through the sliding channel 2. A circulating groove 3 is provided inside the inner wall of the outer ring sleeve 1. A number of balls 4 are accommodated inside the circulating groove 3. The number of balls 4 can fill the circulating groove 3. The outer sides of the balls 4 are in contact with each other. The balls 4 can circulate inside the circulating groove 3. The balls 4 reduce the friction generated when the shaft body slides by abutting against the outside of the shaft body. The circulating groove 3 includes a proximal groove 3-1 and a distal groove 3-2 that penetrate along the axial direction of the outer ring sleeve 1. The sizes of the proximal groove 3-1 and the distal groove 3-2 are the same. The proximal groove 3-1 is closer to the sliding channel 2 in the radial position than the distal groove 3-2. A semi-open groove 6 that communicates with the sliding channel 2 is provided on the proximal groove 3-1. The balls 4 contact the shaft body installed inside the sliding channel 2 through the semi-open groove 6. Steering devices 5 that are closely attached to both ends of the proximal groove 3-1 and the distal groove 3-2 are installed at both ends of the outer ring sleeve 1. The function of the steering device 5 is to allow the balls 4 to circulate inside the proximal groove 3-1 and the distal groove 3-2. For example, allowing the balls 4 in the proximal groove 3-1 to enter the distal groove 3-2, or allowing the balls 4 in the distal groove 3-2 to enter the proximal groove 3-1. The steering device 5 includes an annular sealing sleeve 5-1 fixedly installed at the ends of the proximal groove 3-1 and the distal groove 3-2. The inner diameter of the annular sealing sleeve 5-1 is the same as the diameter of the sliding channel 2. A U-shaped commutation groove 5-2 is provided inside the annular sealing sleeve 5-1. One end of the U-shaped commutation groove 5-2 communicates with the proximal groove 3-1, and the other end communicates with the distal groove 3-2. The balls 4 enter and exit the proximal groove 3-1 and the distal groove 3-2 through the U-shaped commutation groove 5-2. A gasket 7 that makes the steering device 5 closely attached to the circulating groove 3 is detachably connected to the inner wall of the outer ring sleeve 1. A groove body for positioning and accommodating the gasket 7 is provided on the inner wall of the outer ring sleeve 1.

[0030] Refer to the attached Figure 1 ~attached Figure 9: Since the setting of the cage is cancelled, the linear bearing can be applied to medium-load and heavy-load scenarios, but this will cause the wear of the ball 4 to accelerate. In order to detect in time the ball 4 whose wear exceeds the limit, a detecting member 8 for detecting the wear degree of the ball 4 is installed on the outer ring sleeve 1. The detecting member 8 includes a mounting seat 8-1 fixed on the outer side of the outer ring sleeve 1. The mounting seat 8-1 is of a cylindrical structure. The bottom of the mounting seat 8-1 is fixed on the outer side of the outer ring sleeve 1. A transmission inner cavity 8-2 is formed inside the mounting seat 8-1. The transmission inner cavity 8-2 is of a cylindrical setting. A transmission plate 8-3 which is hermetically and slidably connected with the transmission inner cavity 8-2 is arranged at the bottom of the transmission inner cavity 8-2. The space between the top of the transmission inner cavity 8-2 and the transmission plate 8-3 is filled with hydraulic oil. A lifting groove 8-4 leading to the transmission inner cavity 8-2 is arranged at the top of the mounting seat 8-1. The transmission plate 8-3 can push the hydraulic oil into the lifting groove 8-4 by rising. The diameter of the transmission inner cavity 8-2 is larger than that of the lifting groove 8-4. A pressure rod 8-5 which passes through the bottom of the mounting seat 8-1 and the outer ring sleeve 1 is fixedly installed on the transmission plate 8-3. The bottom of the pressure rod 8-5 is semi-circular and abuts between two balls 4. The semi-circular bottom of the pressure rod 8-5 is made of engineering plastic. When the balls 4 move in a circulating motion inside the circulating groove 3, they push the pressure rod 8-5 to rise;A lifting rod 8-6 is slidably connected inside the lifting groove 8-4 and passes through the top of the mounting seat 8-1. The lifting rod 8-6 is in sealed sliding connection and rotational connection with the inner wall of the lifting groove 8-4. The transmission plate 8-3 pushes hydraulic oil into the lifting groove 8-4 through rising. The hydraulic oil entering the lifting groove 8-4 pushes the lifting rod 8-6 to rise and fall. The larger the ratio of the radius of the lifting groove 8-4 to the radius of the transmission cavity 8-2, the larger the ratio of the rising height of the lifting rod 8-6 to the rising height of the transmission plate 8-3. That is, when the transmission plate 8-3 rises by a distance of 1 unit, the lifting rod 8-6 rises by a distance of 1X units. The value of X is positively correlated with the ratio of the radius of the lifting groove 8-4 to the radius of the transmission cavity 8-2. Since the distance that the ball 4 pushes the push rod 8-5 to rise is relatively small, the above setting is used to magnify the rising distance of the push rod 8-5. A turntable 8-7 located at the top of the mounting seat 8-1 is fixedly installed at the top of the lifting rod 8-6. A spiral groove 8-8 is provided on the outer side of the lifting rod 8-6, and a guiding convex block 8-9 cooperating with the spiral groove 8-8 is provided on the inner wall of the lifting groove 8-4. The lifting rod 8-6 rotates through the cooperation of the spiral groove 8-8 and the guiding convex block 8-9 during the lifting process. When the lifting rod 8-6 rises, the convex block 8-9 slides along the spiral groove 8-8, forcing the lifting rod 8-6 to rotate during the rising process. An indicating sleeve 8-10 is rotatably connected to the outside of the mounting seat 8-1. An annular clamping groove 8-15 is provided on the inner wall of the indicating sleeve 8-10, and an annular plate 8-16 cooperating with the annular clamping groove 8-15 is fixedly installed on the outside of the mounting seat 8-1. The indicating sleeve 8-10 is rotatably connected to the mounting seat 8-1 through the annular clamping groove 8-15 and the annular plate 8-16. The purpose of this setting is to lock the axial movement of the indicating sleeve 8-10 while not restricting the circumferential rotation of the indicating sleeve 8-10. A key block 8-11 is installed on the inner wall of the indicating sleeve 8-10, and a key groove 8-12 cooperating with the key block 8-11 is provided on the outer side of the turntable 8-7. Both the key block 8-11 and the key groove 8-12 are provided in multiple numbers. The turntable 8-7 drives the indicating sleeve 8-10 to rotate through the cooperation of the key groove 8-12 and the key block 8-11. The rotation angle of the sleeve 8-10 is positively correlated with the rising distance of the push rod 8-5. A spring 8-13 is provided inside the indicating sleeve 8-10. One end of the spring 8-13 abuts against the top inner wall of the indicating sleeve 8-10, and the other end of the spring 8-13 abuts against the top of the turntable 8-7. The spring 8-13 is used to push the push rod 8-5 back to the state before rising. The spring 8-13 is placed inside the indicating sleeve 8-10, and both ends of the spring 8-13 are not fixed to the sleeve 8-10 and the turntable 8-7 to avoid hindering the rotation of the turntable 8-7 and the indicating sleeve 8-10. A marking member 8-14 fixedly connected to the indicating sleeve 8-10 is provided on the outside of the mounting seat 8-1. The indicating sleeve 8-10 can drive the marking member 8-14 to scribble and mark the movement track on the outside of the mounting seat 8-1 through rotation.;

[0031] Refer to the appendix Figure 1~Appendix Figure 9 : The marking member 8-14 includes a wiping plate 8-14a with one end closely attached to the outer side of the indicating sleeve 8-10. A placement groove 8-14b that faces the indicating sleeve 8-10 and slopes downward is formed on the wiping plate 8-14a. The placement groove 8-14b leads to the outside of the indicating sleeve 8-10. A wiping piece 8-14c that relies on gravity to closely adhere to the outer side of the indicating sleeve 8-10 is placed inside the placement groove 8-14b. The function of this structure is that when the wiping piece 8-14c is consumed, the wiping piece 8-14c can always closely adhere to the outer side of the indicating sleeve 8-10 under the action of gravity. Substances such as graphite or pigments that can leave visible traces on the outer side of an object by smearing or rubbing are incorporated inside the wiping piece 8-14c. There can be a coating or an adhesive layer on the outer side of the indicating sleeve 8-10 to facilitate the wiping of the wiping piece 8-14c.

[0032] Refer to Appendix Figure 5 : The connecting line of the proximal groove 3-1 and the distal groove 3-2 forms an α angle with the connecting line of the proximal groove 3-1 and the outer ring sleeve 1. The range of the α angle is 120° to 180°. Compared with a common linear bearing, the setting of the α angle can increase the available space of the circulating groove 3 when the size of this bearing is the same as or similar to that of a common linear bearing, enabling the number of circulating grooves 3 that can be set to increase, and the inside can accommodate larger-sized and more numerous balls 4, thereby greatly increasing the load-bearing capacity.

[0033] During use, the shaft body is placed into the sliding channel 2, and the outer side of the shaft body contacts the balls 4. When the shaft body slides, it drives the balls 4 to circulate and roll inside the circulating groove 3. When the balls 4 are in circular motion, they push the pressure rod 8-5 to rise. The rising of the pressure rod 8-5 pushes the transmission plate 8-3 to rise. The rising of the transmission plate 8-3 pushes the hydraulic oil in the transmission cavity 8-2 into the lifting groove 8-4 from the transmission cavity 8-2. After the hydraulic oil enters the lifting groove 8-4, it pushes the lifting rod 8-6 to rise. When the lifting rod 8-6 rises, it rotates through the spiral groove 8-8 and the guiding convex block 8-9. The rotation of the lifting rod 8-6 drives the turntable 8-7 to rotate. The turntable 8-7 drives the indicating sleeve 8-10 to rotate through the key block 8-11 and the key groove 8-12. The rotation of the indicating sleeve 8-10 drives the marking member 8-14 to rotate. When the marking member 8-14 rotates, the wiping piece 8-14c wipes out a movement track on the outer side of the mounting seat 8-1. Equally spaced scale lines can be set on the outer side of the mounting seat 8-1. After the linear bearing is used for a long time, the balls 4 will wear, resulting in a decrease in diameter, causing the distance that the balls 4 can push the pressure rod 8-5 to rise and fall to become shorter. The shorter distance that the pressure rod 8-5 rises and falls will make the track wiped by the rotation of the marking member 8-14 shorter. The wear condition of the balls 4 can be indirectly observed through the length of the track. The wiping piece 8-14c can be regularly installed weekly or monthly, and then the length of the wiping track of the wiping piece 8-14c on the outer side of the mounting seat 8-1 is recorded to judge the wear condition of the balls 4.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overloaded linear bearing, comprising an outer ring sleeve (1), a sliding channel (2) which is axially penetrated and used for installing a shaft body is arranged at the center of the outer ring sleeve (1), and is characterized in that: A circulation groove (3) penetrating in the axial direction of the outer ring sleeve (1) is provided inside the side wall of the outer ring sleeve (1). A number of mutually contacting balls (4) are accommodated inside the circulation groove (3). Steering devices (5) for enabling the balls (4) to circulate inside the circulation groove (3) are installed at both ends of the outer ring sleeve (1). A semi-open groove (6) communicating with the sliding channel (2) is provided on the circulation groove (3). The balls (4) contact the shaft body installed inside the sliding channel (2) through the semi-open groove (6).

2. The heavy-duty linear bearing according to claim 1, characterized in that: A gasket (7) for closely attaching the steering device (5) to the circulation groove (3) is detachably connected to the inner wall of the outer ring sleeve (1).

3. The heavy-duty linear bearing according to claim 1, characterized in that: The circulation groove (3) includes a proximal groove (3-1) and a distal groove (3-2) penetrating in the axial direction of the outer ring sleeve (1). The proximal groove (3-1) is closer to the sliding channel (2) in the radial position than the distal groove (3-2). The semi-open groove (6) is provided on the proximal groove (3-1).

4. The heavy-duty linear bearing according to claim 3, wherein: The connecting line of the centers of the proximal groove (3-1) and the distal groove (3-2) forms an α angle with the connecting line of the centers of the proximal groove (3-1) and the outer ring sleeve (1). The range of the α angle is 120° to 180°.

5. The heavy-duty linear bearing according to claim 3, characterized in that: The steering device (5) includes an annular sealing sleeve (5-1) fixedly installed at the ends of the proximal groove (3-1) and the distal groove (3-2). A U-shaped reversing groove (5-2) communicating the proximal groove (3-1) and the distal groove (3-2) is provided inside the annular sealing sleeve (5-1). The balls (4) enter and exit the proximal groove (3-1) and the distal groove (3-2) through the U-shaped reversing groove (5-2).

6. The heavy-duty linear bearing according to claim 1, wherein: A detecting member (8) for detecting the wear degree of the balls (4) is installed on the outer ring sleeve (1). The detecting member (8) includes a mounting seat (8-1) fixed to the outside of the outer ring sleeve (1). A transmission inner cavity (8-2) is provided inside the mounting seat (8-1). A transmission plate (8-3) hermetically slidingly connected to the transmission inner cavity (8-2) is provided at the bottom of the transmission inner cavity (8-2). The space between the top of the transmission inner cavity (8-2) and the transmission plate (8-3) is filled with hydraulic oil. A lifting groove (8-4) leading to the transmission inner cavity (8-2) is provided at the top of the mounting seat (8-1). The diameter of the lifting groove (8-4) is smaller than the diameter of the transmission inner cavity (8-2). The transmission plate (8-3) can push the hydraulic oil into the lifting groove (8-4) by rising. A pressure rod (8-5) passing through the bottom of the mounting seat (8-1) and the outer ring sleeve (1) is fixedly installed on the transmission plate (8-3). The bottom of the pressure rod (8-5) is semi-circular and presses between two balls (4). The balls (4) push the pressure rod (8-5) to rise during the circular motion.

7. The heavy-duty linear bearing according to claim 6, characterized in that: A lifting rod (8-6) that penetrates through the top of the mounting base (8-1) is slidably connected inside the lifting groove (8-4). A turntable (8-7) located at the top of the mounting base (8-1) is fixedly installed at the top of the lifting rod (8-6). A spiral groove (8-8) is provided on the outer side of the lifting rod (8-6). A guiding convex block (8-9) that cooperates with the spiral groove (8-8) is provided on the inner wall of the lifting groove (8-4). The lifting rod (8-6) rotates during the lifting process through the cooperation of the spiral groove (8-8) and the guiding convex block (8-9).

8. The heavy-duty linear bearing according to claim 7, characterized in that: An indicating sleeve (8-10) is rotatably connected to the outside of the mounting base (8-1). A key block (8-11) is installed on the inner wall of the indicating sleeve (8-10). A key groove (8-12) that cooperates with the key block (8-11) is formed on the outside of the turntable (8-7). The turntable (8-7) drives the indicating sleeve (8-10) to rotate through the cooperation of the key groove (8-12) and the key block (8-11). A spring (8-13) is provided inside the indicating sleeve (8-10), with one end pressing against the top of the inner wall of the indicating sleeve (8-10) and the other end pressing against the top of the turntable (8-7). A marking member (8-14) fixedly connected to the indicating sleeve (8-10) is provided on the outside of the mounting base (8-1). The indicating sleeve (8-10) can drive the marking member (8-14) to scribble and mark the movement track on the outside of the mounting base (8-1) by rotation.

9. The heavy-duty linear bearing according to claim 8, wherein: An annular clamping groove (8-15) is provided on the inner wall of the indicating sleeve (8-10). An annular plate (8-16) that cooperates with the annular clamping groove (8-15) is fixedly installed on the outside of the mounting base (8-1). The indicating sleeve (8-10) is rotatably connected to the mounting base (8-1) through the cooperation of the annular clamping groove (8-15) and the annular plate (8-16).

10. The heavy-duty linear bearing according to claim 8, characterized in that: The marking member (8-14) includes a wiping plate (8-14a) with one end closely attached to the outside of the indicating sleeve (8-10). A placing groove (8-14b) that faces the indicating sleeve (8-10) and slopes downward is formed on the wiping plate (8-14a). The placing groove (8-14b) leads to the outside of the indicating sleeve (8-10). A wiping piece (8-14c) that closely adheres to the outside of the indicating sleeve (8-10) by gravity is placed inside the placing groove (8-14b). Graphite or pigment is incorporated inside the wiping piece (8-14c).

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