Linear guide rail facilitating prepressing of rollers

Abstract

The linear guide rail comprises a guide rail body and a sliding block moving in the length direction of the guide rail body, retainers are connected to the left side and the right side of the interior of the sliding block respectively, the retainers on the two sides are matched with the sliding block to form a roller path for the rollers to rotate circularly, and the left side wall and the right side wall of the interior of the sliding block are each provided with an annular groove. The sliding block is matched with the retainer to form an outer raceway for the rollers to move, the rollers abut against each other in the outer raceway by the sliding block and the guide rail, so that when the sliding block drives the rollers to move, the rollers always keep preset pretightening force, and the pretightening force of the rollers can be accurately adjusted by accurately controlling the size of the raceway on the sliding block, the size of the rollers and the distance between guide rail slideways. It is ensured that the pin rollers always keep uniform pre-tightening force in the outer raceway, so that vibration and deviation of the sliding block in the moving process are reduced, and the precision and stability of a system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sliders, and in particular to a linear guide rail that is convenient for roller preloading. Background Art

[0002] As an important transmission device, linear guides are widely used in various mechanical equipment, such as CNC machine tools and industrial robots. The main function of linear guides is to provide precise linear motion to ensure that mechanical parts can move smoothly and accurately along the predetermined path. However, with the development of industrial technology and the continuous improvement of application needs, traditional linear guides have gradually shown their shortcomings in some aspects.

[0003] Especially in applications with large-sized sliders and long strokes, existing linear guides face the following major problems: 1. Due to the large size of the slider and the long stroke of the raceway, the coordination between the roller, slider and guide rail becomes complicated. If the roller size, the raceway size on the slider and the distance between the guide rails are not properly coordinated, it is easy to cause uneven roller preload. This uneven preload will cause the slider to vibrate or deviate during movement, thereby affecting the accuracy and stability of the entire system; 2. Large-sized sliders usually need to bear larger loads, and the traditional single outer raceway design often cannot meet the requirements of high load-bearing capacity, which not only limits the working range of the equipment, but also may cause premature wear of the slider and shorten its service life; 3. The direct contact between the roller, slider and guide rail will generate greater friction, especially in high-speed or high-frequency movements. Long-term friction will cause wear on the roller and guide rail surfaces, increase maintenance costs, and reduce the operating efficiency of the system. Summary of the invention

[0004] The present invention aims to solve the problems existing in the above-mentioned prior art and provide a linear guide rail which is convenient for roller preloading and ensures that the roller reaches a suitable preload between the slider and the guide rail.

[0005] The present invention solves the technical problem by adopting a technical solution: the linear guide rail for roller preloading comprises: a guide rail and a slider moving along the length direction of the guide rail, wherein the left and right sides of the slider are respectively connected with retaining frames, and the retaining frames on each side cooperate with the slider to form a raceway for the roller to circulate, wherein: On the inner left and right side walls of the slider, the slider cooperates with the retaining frame to form an outer raceway for roller movement. The roller is pressed against each other by the slider and the guide rail in the outer raceway to ensure that the roller always maintains a preset preload when the slider drives the roller to move.

[0006] Preferably, a flexible guide sleeve for mounting a roller is slidably connected in the raceway, and the flexible guide sleeve drives the roller to move on the outer raceway.

[0007] Preferably, inwardly recessed guide grooves are provided on both sides of the guide rail, limit blocks are provided on the left and right sides of the slider, and a middle bracket for fixing the flexible guide sleeve is provided on the retaining frame. The middle bracket is installed on the limit blocks and is slidably connected to the guide grooves.

[0008] Preferably, two outer raceways are provided on each side of the slider, and the two outer raceway holes on the same side are arranged in a mirror image along the middle bracket on the retaining frame.

[0009] Preferably, guide grooves are formed on the left and right sides of the outer raceway, and guide blocks are provided on both sides of the flexible guide sleeve, and the guide blocks on both sides are respectively slidably connected to the guide grooves on the same side.

[0010] Preferably, the guide groove has guide parts on both sides, the guide parts are inclined toward both sides along the guide groove, the limit block is provided with a mounting part, and the roller is interference fit with the mounting part and the guide part on the outer raceway.

[0011] Preferably, the guide portion is provided with a first guide surface, the mounting portion is provided with a second guide surface, and the first guide surface is provided in parallel with the second guide surface.

[0012] Preferably, the slider includes a slider body and end covers located at both ends of the slider body, the left and right sides of the interior of the slider body are provided with inner raceway holes for roller movement, and a removable inner circulation end cover is provided on the inner side of the end cover. The inner circulation end cover cooperates with the inner raceway, retaining frame and outer raceway to form a complete raceway for the flexible guide sleeve to circulate and rotate.

[0013] Preferably, the flexible guide sleeve is evenly provided with a plurality of limit members along its length, the two sides of the limit members are respectively connected to the guide blocks on the two sides, and adjacent limit members are formed with grooves for limiting the roller.

[0014] Preferably, the limiting member includes a first clamping portion and a second clamping portion located on the left and right sides of the first clamping portion and connected to the corresponding side guide block, and the front and rear sides of the first clamping portion and the second clamping portion are both provided with an arc surface inclined from one end to the other end, wherein the direction of the first clamping portion is opposite to the direction of the second clamping portions on the left and right sides.

[0015] The present invention has the following beneficial effects: 1. By precisely controlling the raceway size, roller size and distance between the guide rails on the slider, the rollers are ensured to always maintain uniform preload in the outer raceway, thereby reducing the vibration and deviation of the slider during movement and improving the accuracy and stability of the system; 2. The design of the guide parts on both sides of the guide groove and the mounting parts on the limit block make the rollers on the outer raceway have an interference fit with the mounting parts and the guide parts, further enhancing the stability and consistency of the system operation. The design of the limiter on the flexible guide sleeve, including the arcuate surfaces of the first clamping part and the second clamping part and the opposite orientation setting, helps to correctly arrange the rollers in the flexible guide sleeve and improve the positioning accuracy and stability; 3. There are two outer raceways on each side of the slider, and the two outer raceway holes on the same side are mirrored along the middle bracket on the retaining frame. This double outer raceway design increases the load-bearing area of ​​the slider and improves the load-bearing capacity of the system, enabling it to better cope with large-size sliders and high-load applications. The design of the flexible guide sleeve reduces the direct contact between the roller and the slider and the guide rail, reduces friction, effectively reduces the wear of the roller and guide rail surface, extends the service life of the system, and improves operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a linear guide rail that is convenient for roller preloading; Figure 2 A cross-sectional view of a linear guide rail that facilitates roller preloading; Figure 3 An exploded view of a linear guide rail that facilitates roller preloading; Figure 4 It is a structural schematic diagram of the flexible guide sleeve; Figure 5 for Figure 4 A partial enlarged view of the middle A; Figure 6 is a schematic diagram of the structure of the guide rail; Figure 7 It is a structural schematic diagram of the guide groove and the middle bracket; Figure 8 It is a schematic diagram of the structure of the outer raceway of the slider; Fig. 9 It is a schematic diagram of the structure of the limit block and retaining frame in the slider.

[0017] Description of reference numerals: 1. Guide rail; 100. Guide groove; 101. Guide portion; 102. First guide surface; 2. Slider; 20. Cage; 21. Slider body; 22. End cover; 200. Outer raceway; 201. Flexible guide sleeve; 202. Limit block; 203. Middle bracket; 204. Guide groove; 205. Guide block; 206. Second guide surface; 207. Inner raceway hole; 208. Inner circulation end cover; 209. Limit member; 210. First clamping part; 211. Second clamping part; 212. Roller; 213. Mounting part. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings: See attached Figures 1 to 9 As shown: a linear guide rail that is convenient for roller preloading, comprising: a guide rail 1 and a slider 2 that moves along the length direction of the guide rail 1, wherein retaining frames 20 are respectively connected to the left and right sides of the inside of the slider 2, and the retaining frames 20 on each side cooperate with the slider 2 to form a raceway for the roller 212 to circulate and rotate, wherein, on the left and right side walls inside the slider 2, the slider 2 cooperates with the retaining frame 20 to form an outer raceway 200 for the roller 212 to move, and the roller 212 is pushed against each other by the slider 2 and the guide rail 1 in the outer raceway 200 to ensure that when the slider 2 drives the roller 212 to move, the roller 212 always maintains a preset preload.

[0019] In this embodiment, the guide rail 1 serves as a supporting base and provides a straight path; the left and right sides of the slider 2 are respectively connected to a retaining frame 20, and the retaining frame 20 cooperates with the slider 2 to form a raceway for the roller 212 to circulate. On the left and right side walls inside the slider 2, the slider 2 and the retaining frame 20 jointly form an outer raceway 200 for the roller 212 to move. The roller 212 is pressed against each other by the slider 2 and the guide rail 1 in the outer raceway 200 to ensure that when the slider 2 drives the roller 212 to move, the roller 212 always maintains a preset preload force. By accurately controlling the raceway size on the slider 2, the roller 212 size and the distance between the guide rail 1 slides, a uniform preload force is achieved, thereby reducing vibration and offset, and improving the accuracy and stability of the system. This design reduces the wear between the roller 212 and the slider 2 and the guide rail 1, prolongs the service life of the system, and is suitable for applications with large-size sliders 2 and long strokes, meeting the requirements of high precision and high load-bearing capacity.

[0020] Preferably, if Figure 2 , Figure 4 and Figure 5 As shown, a flexible guide sleeve 201 for mounting a roller 212 is slidably connected in the raceway, and the flexible guide sleeve 201 drives the roller 212 to move on the outer raceway 200 .

[0021] The flexible guide sleeve 201 is made of a wear-resistant material with a certain degree of elasticity, and is internally designed with a structure for fixing the roller 212. The flexible guide sleeve 201 reduces the direct contact between the roller 212 and the slider 2 and the guide rail 1, reduces friction, reduces wear, and improves the operating efficiency and accuracy of the system. By accurately controlling the preload force, the flexible guide sleeve 201 ensures that the roller 212 maintains uniform pressure during movement, reducing vibration and deviation.

[0022] Furthermore, if Figure 2 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, inwardly recessed guide grooves 100 are provided on both sides of the guide rail 1, limit blocks 202 are provided on the left and right sides of the slider 2, and a middle bracket 203 for fixing the flexible guide sleeve 201 is provided on the retaining frame 20. The middle bracket 203 is installed on the limit block 202 and is slidably connected to the guide groove 100.

[0023] Inwardly recessed guide grooves 100 are provided on both sides of the guide rail 1 to provide guidance and support for the slider 2. Limit blocks 202 are provided on the left and right sides of the slider 2 to limit the lateral movement of the slider 2 and provide an installation basis. A middle bracket 203 for fixing the flexible guide sleeve 201 is provided on the retaining frame 20. The bracket is installed on the limit block 202 and is slidably connected to the guide groove 100 to ensure that the position of the flexible guide sleeve 201 inside the slider 2 is stable and can move smoothly. This design improves the guiding accuracy and stability of the system, reduces friction and wear, and extends the service life.

[0024] Furthermore, if Figure 6 and Figure 7 As shown, two outer raceways 200 are provided on each side of the slider 2 , and the holes of the two outer raceways 200 on the same side are arranged in a mirror image along the middle bracket 203 on the retaining frame 20 .

[0025] Two outer raceways 200 are provided on each side of the slider 2, and the two outer raceway 200 holes on the same side are arranged in mirror symmetry along the middle bracket 203 on the retaining frame 20. The double outer raceway 200 design increases the contact area between the slider 2 and the guide rail 1, improves the load-bearing capacity and stability of the system, and the symmetrical arrangement ensures the uniform distribution of the rollers 212 inside the slider 2, reduces deviation and vibration, optimizes the preload force distribution, and thus improves the overall performance and accuracy of the system.

[0026] Furthermore, if Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, guide grooves 204 are formed on the left and right sides of the outer raceway 200 , and guide blocks 205 are provided on both sides of the flexible guide sleeve 201 . The guide blocks 205 on both sides are respectively slidably connected to the guide grooves 204 on the same side.

[0027] Guide grooves 204 are formed on the left and right sides of the outer raceway 200, and guide blocks 205 are provided on both sides of the flexible guide sleeve 201. The guide blocks 205 on both sides are respectively slidably connected to the guide grooves 204 on the same side, ensuring that the flexible guide sleeve 201 can move smoothly inside the slider 2, providing precise guidance and stable support, and reducing deviation and vibration.

[0028] Preferably, if Figure 2 , Figure 6 and Figure 7As shown, the guide groove 100 has guide parts 101 on both sides, and the guide parts 101 are inclined to both sides along the guide groove 100. The limit block 202 is provided with a mounting part 213, and the roller 212 is interference fit with the mounting part 213 and the guide part 101 on the outer raceway 200.

[0029] Guide portions 101 are provided on both sides of the guide groove 100. These guide portions 101 are located on the inner edge of the guide groove 100 and extend along the length direction of the guide groove 100. They are usually designed to be inclined surfaces or arc-shaped surfaces that gradually tilt from the bottom of the guide groove 100 to both sides, and are used to guide and support the roller 212 to ensure that it runs smoothly along a predetermined path during movement, reduce deviation and vibration, and maintain a stable position. A mounting portion 213 is provided on the limit block 202, which is located on the inner side of the limit block 202, close to the position of the outer raceway 200, and is used to fix the roller 212 and accurately control the preload force to ensure that the position of the roller 212 in the outer raceway 200 is stable. The roller 212 is interference fit with the mounting portion 213 and the guide portion 101 on the outer raceway 200, which means that the diameter of the roller 212 is slightly larger than the gap between the mounting portion 213 and the guide portion 101, thereby generating a certain clamping force, ensuring that the roller 212 is always subjected to a uniform preload force, reducing the clearance, and improving the rigidity and stability of the system.

[0030] It should be noted that in the process of achieving uniform preload, when the raceway size and the guide rail 1 slideway size remain the same, the roller 212 size will be several miu units larger than the raceway size and the guide rail 1 slideway, so that the roller can achieve surface-to-surface contact.

[0031] Furthermore, if Figure 6 , Figure 7 and Fig. 9 As shown, a first guide surface 102 is provided on the guide portion 101 , and a second guide surface 206 is provided on the mounting portion 213 . The first guide surface 102 and the second guide surface 206 are arranged in parallel.

[0032] The first guide surface 102 and the second guide surface 206 are arranged in parallel, which ensures that the roller 212 is subjected to uniform guiding force and supporting force during movement, reduces deviation and vibration, and improves the guiding accuracy and stability of the system. Through high-precision processing and measurement, the flatness and parallelism of the first guide surface 102 and the second guide surface 206 are ensured, thereby achieving uniform preload force distribution, reducing the clearance between the roller 212 and the slider 2 and the guide rail 1, and improving the rigidity and stability of the system.

[0033] Preferably, if Figure 3 and Figure 7 , Figure 8 and Fig. 9As shown, the slider 2 includes a slider body 21 and end covers 22 located at both ends of the slider body 21. The left and right sides of the interior of the slider body 21 are provided with inner raceway holes 207 for the movement of rollers 212. A detachable inner circulation end cover 208 is provided on the inner side of the end cover 22. The inner circulation end cover 208 cooperates with the inner raceway, the retaining frame 20 and the outer raceway 200 to form a complete raceway for the flexible guide sleeve 201 to circulate and rotate.

[0034] The slider 2 includes a slider body 21 and end covers 22 located at both ends of the slider body 21. The left and right sides of the interior of the slider body 21 are provided with inner raceway holes 207 for the movement of rollers 212. These inner raceway holes 207 provide an internal movement path for the rollers 212. A removable inner circulation end cover 208 is provided on the inner side of the end cover 22. The inner circulation end cover 208, the inner raceway, the retaining frame 20 and the outer raceway 200 together form a complete raceway system, ensuring that the flexible guide sleeve 201 can circulate smoothly inside the slider 2, which not only improves the maintenance convenience, but also enhances the stability of the system. By precisely controlling the position and size of each component, a uniform preload force distribution is achieved, the clearance between the roller 212 and the slider 2 and the guide rail 1 is reduced, the rigidity and precision of the system are improved, and the service life is extended.

[0035] Preferably, if Figure 2 , Figure 4 and Figure 5 As shown, the flexible guide sleeve 201 is evenly provided with a plurality of limit members 209 along its length. Both sides of the limit members 209 are respectively connected to the guide blocks 205 on both sides. Adjacent limit members 209 are formed with grooves for limiting the rollers 212 .

[0036] The flexible guide sleeve 201 is evenly provided with a number of limit members 209 along its length. Both sides of these limit members 209 are respectively connected to the guide blocks 205 on both sides of the flexible guide sleeve 201. A slot for limiting the roller 212 is formed between adjacent limit members 209, thereby ensuring the stable arrangement and correct position of the roller 212 in the flexible guide sleeve 201, reducing deviation and vibration, and enhancing the overall stability of the system. By precisely controlling the size and shape of the slot, uniform preload force distribution is achieved, thereby improving the performance and accuracy of the system.

[0037] Furthermore, if Figure 5 As shown, the limiting member 209 includes a first clamping portion 210 and a second clamping portion 211 located on the left and right sides of the first clamping portion 210 and connected to the corresponding side guide block 205, and the front and rear sides of the first clamping portion 210 and the second clamping portion 211 are both provided with an arc surface inclined from one end to the other end, wherein the direction of the first clamping portion 210 is opposite to the direction of the second clamping portions 211 on the left and right sides.

[0038] The limiting member 209 includes a first clamping portion 210 and a second clamping portion 211 located on the left and right sides thereof and connected to the corresponding side guide block 205. The front and rear sides of the first clamping portion 210 and the second clamping portion 211 are both provided with an arcuate surface inclined from one end to the other end, wherein the arcuate surface of the first clamping portion 210 is oriented opposite to the arcuate surfaces of the second clamping portions 211 on the left and right sides. This design ensures the stable arrangement and correct position of the roller 212 in the flexible guide sleeve 201, prevents the roller 212 from escaping therefrom, reduces deviation and vibration, and enhances the overall stability of the system. By precisely controlling the size and shape of the slot, uniform preload force distribution is achieved, thereby improving the performance and accuracy of the system.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A linear guide rail that facilitates roller preloading, characterized in that: include: A guide rail and a slider moving along the length direction of the guide rail, wherein the left and right sides of the slider are respectively connected with a retaining frame, and the retaining frame on each side cooperates with the slider to form a raceway for the roller to circulate and rotate, wherein: On the inner left and right side walls of the slider, the slider cooperates with the retaining frame to form an outer raceway for roller movement. The roller is pressed against each other by the slider and the guide rail in the outer raceway to ensure that the roller always maintains a preset preload when the slider drives the roller to move.

2. A linear guide rail for roller preloading according to claim 1, characterized in that: A flexible guide sleeve for mounting a roller is slidably connected in the raceway, and the flexible guide sleeve drives the roller to move on the outer raceway.

3. A linear guide rail for roller preloading according to claim 2, characterized in that: The guide rails are provided with inwardly recessed guide grooves on both sides, limit blocks are provided on the left and right sides of the slider, and the retaining frame is provided with a middle bracket for fixing the flexible guide sleeve, and the middle bracket is installed on the limit blocks and is slidably connected to the guide grooves.

4. A linear guide rail for roller preloading according to claim 3, characterized in that: The slider is provided with two outer raceways on each side, and the two outer raceway holes on the same side are arranged in a mirror image along the middle bracket on the retaining frame.

5. A linear guide rail for roller preloading according to claim 4, characterized in that: Guide grooves are formed on the left and right sides of the outer raceway, and guide blocks are arranged on both sides of the flexible guide sleeve. The guide blocks on both sides are respectively slidably connected with the guide grooves on the same side.

6. A linear guide rail for roller preloading according to claim 3, characterized in that: The guide groove has guide parts on both sides, and the guide parts are inclined toward both sides along the guide groove. The limit block is provided with a mounting part, and the roller is interference-fitted with the mounting part and the guide part on the outer raceway.

7. A linear guide rail for roller preloading according to claim 6, characterized in that: The guide portion is provided with a first guide surface, and the mounting portion is provided with a second guide surface, and the first guide surface is arranged in parallel with the second guide surface.

8. The linear guide rail for facilitating roller preloading according to claim 1, characterized in that: The slider includes a slider body and end covers at both ends of the slider body. The left and right sides of the interior of the slider body are provided with inner raceway holes for roller movement. A detachable inner circulation end cover is provided on the inner side of the end cover. The inner circulation end cover cooperates with the inner raceway, the retaining frame and the outer raceway to form a complete raceway for the flexible guide sleeve to circulate and rotate.

9. A linear guide rail for roller preloading according to claim 5, characterized in that: The flexible guide sleeve is evenly provided with a plurality of limit members along its length, and the two sides of the limit members are respectively connected to the guide blocks on the two sides, and adjacent limit members are formed with a clamping groove for limiting the roller.

10. A linear guide rail for roller preloading according to claim 9, characterized in that: The limiting member includes a first clamping portion and a second clamping portion located on the left and right sides of the first clamping portion and connected to the corresponding side guide blocks, and the front and rear sides of the first clamping portion and the second clamping portion are both provided with an arc surface inclined from one end to the other end, wherein the direction of the first clamping portion is opposite to the direction of the second clamping portions on the left and right sides.

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