Double-nut ball screw

Abstract

The utility model relates to the technical field of ball screws, and discloses a double-nut ball screw which comprises a screw, a first nut is in threaded connection with the left side of the middle of the screw, a second nut is in threaded connection with the right side of the middle of the screw, and a pre-tightening block is fixedly connected between the first nut and the second nut. A plurality of extrusion blocks are slidably connected to the inner wall of the pre-tightening block, U-shaped blocks are fixedly connected to the adjacent sides of the extrusion blocks, connecting columns are fixedly connected to the inner walls of the U-shaped blocks, upper connecting rods are rotatably connected to the outer walls of the connecting columns, and threaded sleeves are rotatably connected to the other ends of the upper connecting rods; the middle of the threaded sleeve is rotationally connected with a rotating column, and a threaded groove is formed in the bottom of the rotating column. According to the utility model, through upward displacement of the threaded sleeve, outward opening of the two U-shaped blocks, pushing of the two extrusion blocks to be opened, clearance elimination, adjustment of pre-tightening force is realized, and a good working state is kept.

Description

Technical Field

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

[0002] A ball screw is a mechanical transmission element consisting of a screw, a nut, and balls. The rolling of the balls between the screw and the nut converts rotational motion into linear motion. Ball screws have the advantages of high precision, high efficiency, and high rigidity. Their accuracy can reach the micron level, which can meet the transmission needs of various precision equipment.

[0003] The double-nut structure of the ball screw can improve the rigidity, precision and load-bearing capacity of the ball screw. By adjusting the relative position between the two nuts, the contact pressure between the ball and the screw and nut can be changed, thereby achieving different degrees of pre-tightening effect. The double-nut ball screw can quickly and accurately position and move the workpiece. The high-precision double-nut ball screw can ensure the precise assembly of each component, reducing production errors and scrap rates.

[0004] Ball screws are widely used in various fields. They are used to achieve precise feeding of tools, positioning and transmission of workpieces, and high-precision displacement control. However, the adjustment of the preload force of double-nut ball screws currently requires the use of specific measuring tools to determine the displacement of the nut, and then gradually achieve the required preload force through the adjustment device. This process is relatively complicated and tedious. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a double-nut ball screw, which aims to improve the problem that the adjustment of the preload force of the current double-nut ball screw in the existing technology requires the use of specific measuring tools to determine the displacement of the nut, and then gradually achieves the required preload force through the adjustment device, which is a relatively complicated and tedious process.

[0006] The cam is fixedly provided with a first cam and a second cam which is fixedly provided with a first cam and a second cam which is fixedly provided with a second cam and a second cam which is fixedly provided with a second cam and a second cam which is fixedly provided with a second cam and a second cam which is fixedly provided with a second cam and a second cam which is fixedly provided with a second cam and a second cam

[0007] As a further description of the above technical solution:

[0008] The detachable structure includes a disassembly groove, which is opened on the outer wall of the second nut. A plurality of fixing tubes are provided on the inner wall of the disassembly groove. A protrusion is fixedly connected to the upper end of the outer wall of the fixing tube. A groove is opened at the lower end of the fixing tube. An outer cover is engaged with the inner wall of the disassembly groove, and a clamping block is fixedly connected to the bottom of the outer cover.

[0009] As a further description of the above technical solution:

[0010] The left end of the lead screw is fixedly connected with a mounting column, and a notch is provided on the outer wall of the mounting column.

[0011] As a further description of the above technical solution:

[0012] One end of the second nut is fixedly connected to a bearing block, and an outer wall of the bearing block is provided with a mounting hole.

[0013] As a further description of the above technical solution:

[0014] An assembly key is fixedly connected to the outer wall of the extrusion block, and an assembly groove is formed on the outer wall of the second nut.

[0015] As a further description of the above technical solution:

[0016] The right end of the lead screw is fixedly connected with a fixing column, and the outer wall of the second nut is fixedly connected with an observation window.

[0017] As a further description of the above technical solution:

[0018] A cross head is fixedly connected to the top of the rotating column, and an operating hole is opened on the outer wall of the pre-tightening block.

[0019] As a further description of the above technical solution:

[0020] A plurality of balls are arranged inside the second nut, and a sealing sleeve is fixedly connected to the outer wall of the outer cover.

[0021] The utility model has the following beneficial effects:

[0022] 1. In the utility model, the pre-tightening block can make the balls inside the first nut and the second nut closely contact the threads on the screw, maintain a certain pre-tightening force, and improve the rigidity, precision and transmission stability of the ball screw. When the balls are slightly worn and affect the precision, the crosshead is rotated and the threaded sleeve is displaced upward. Under the joint action of the lower connecting rod and the upper connecting rod, the U-shaped block opens outward, pushing the two extrusion blocks to open, thereby expanding the distance between the first nut and the second nut, eliminating the gap, and realizing the adjustment of the pre-tightening force to maintain a good working condition.

[0023] 2. In the utility model, when the ball is severely worn and affects the equipment, the outer cover is opened and the fixed tube is taken out. At this time, the severely worn ball can be taken out and replaced with a good ball and placed in the ball track. Finally, the ball is placed in the fixed tube, the protrusion is aligned with the groove and placed in the disassembly groove, the clamping block and the outer cover are pressed tightly, the two ends of the fixed tube are aligned with the ball track, and finally the outer cover is fixed to complete the replacement of the ball, which can effectively ensure the normal operation of the ball screw and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front perspective view of the double-nut ball screw proposed in the utility model;

[0025] Figure 2 This is a partial structural diagram of the double-nut ball screw preload block proposed in the utility model;

[0026] Figure 3 This is a partial structural diagram of the double-nut ball screw extrusion block proposed in the utility model;

[0027] Figure 4 for Figure 3 A magnified view of point A in the figure;

[0028] Figure 5 This is a diagram showing the partial structure of the second nut of the double-nut ball screw proposed in the present invention;

[0029] Figure 6 This is a schematic diagram of the partial structure of the double-nut ball screw disassembly groove proposed in the utility model.

[0030] Legend:

[0031] 1. Screw; 2. Removable structure; 201. Disassembly groove; 202. Fixed tube; 203. Bump; 204. Groove; 205. Outer cover; 206. Pressing block; 3. First nut; 4. Second nut; 5. Preload block; 6. Extrusion block; 7. Ball; 8. Lower connecting rod; 9. Threaded groove; 10. Threaded sleeve; 11. U-shaped block; 12. Upper connecting rod; 13. Rotating column; 14. Crosshead; 15. Connecting column; 16. Bearing block; 17. Observation window; 18. Fixed column; 19. Mounting column; 20. Notch; 21. Operating hole; 22. Assembly key; 23. Assembly groove; 24. Mounting hole; 25. Sealing sleeve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Please see the attached Figure 1 - Attachment Figure 3 The utility model provides an embodiment of a double-nut ball screw, comprising a screw 1, a first nut 3 is threadedly connected to the left side of the middle part of the screw 1, and a second nut 4 is threadedly connected to the right side of the middle part of the screw 1, a pre-tightening block 5 is fixedly connected adjacent to the first nut 3 and the second nut 4, the inner wall of the pre-tightening block 5 is slidably connected to a plurality of extrusion blocks 6, an adjacent side of the extrusion block 6 is fixedly connected to a U-shaped block 11, the inner wall of the U-shaped block 11 is fixedly connected to a connecting column 15, the outer wall of the connecting column 15 is rotatably connected to an upper connecting rod 12, the other end of the upper connecting rod 12 is rotatably connected to a threaded sleeve 10, the middle of the threaded sleeve 10 is rotatably connected to a rotating column 13, a threaded groove 9 is provided at the bottom of the rotating column 13, the outer wall of the threaded groove 9 is threadedly connected to a threaded sleeve 10, the outer wall of the threaded sleeve 10 is rotatably connected to a lower connecting rod 8, the other end of the lower connecting rod 8 is rotatably connected to the outer wall of the pre-tightening block 5, and the outer wall of the second nut 4 is provided with a detachable structure 2, which is used to disassemble the nut shell;

[0034] Specifically, the screw 1 is made of high-strength material to ensure that it will not be deformed or damaged when subjected to large loads. The first nut 3 works together with the first nut 3 to provide stable transmission and support for the ball screw, and cooperates closely with the screw 1 to achieve linear motion through the rolling of the ball. The function of the pre-tightening block 5 is to adjust the pre-tightening force of the double-nut ball screw by adjusting the internal structure, thereby improving the rigidity and precision of the ball screw. The inner wall of the pre-tightening block 5 is slidably connected with a plurality of extrusion blocks 6. These extrusion blocks 6 can move inside the pre-tightening block 5, and the size of the pre-tightening force can be changed by adjusting its position. A U-shaped block 11 is fixedly connected to the adjacent side of the extrusion block 6. The U-shaped block 11 provides an installation position for the connecting column 15 and the upper connecting rod 12, and also plays a role in transmitting force. The connecting column 15 serves as the rotating axis of the upper connecting rod 12, so that the upper connecting rod 12 can rotate within a certain range, and the rotating column 13 can drive the threaded sleeve 10 to move up and down by rotation.

[0035] Please see the attached Figure 5 - Attachment Figure 6 The detachable structure 2 includes a disassembly groove 201, which is opened on the outer wall of the second nut 4. A plurality of fixing tubes 202 are provided on the inner wall of the disassembly groove 201. The upper end of the outer wall of the fixing tube 202 is fixedly connected with a protrusion 203. The lower end of the fixing tube 202 is provided with a groove 204. The inner wall of the disassembly groove 201 is clamped with an outer cover 205. The bottom of the outer cover 205 is fixedly connected with a pressing block 206.

[0036] Specifically, the disassembly groove 201 is opened on the outer wall of the second nut 4. The position of the disassembly groove 201 can ensure that the installation and disassembly of subsequent components can be carried out smoothly. The fixing tube 202 is distributed in the disassembly groove 201. The protrusion 203 cooperates with the groove 204 to play a positioning and locking role. The outer cover 205 is an important component of the detachable structure 2. Its function is to protect the internal components and also facilitate disassembly and installation operations.

[0037] Please see the attached Figure 1 - Attachment Figure 3 The left end of the screw 1 is fixedly connected to a mounting column 19, and a notch 20 is opened on the outer wall of the mounting column 19. One end of the second nut 4 is fixedly connected to the bearing block 16, and a mounting hole 24 is opened on the outer wall of the bearing block 16. The outer wall of the extrusion block 6 is fixedly connected to the assembly key 22, and the outer wall of the second nut 4 is opened with an assembly groove 23;

[0038] Specifically, the mounting column 19 plays an important connecting role in the entire double-nut ball screw structure. The notch 20 can be used for coordinated installation with other components to provide positioning or fixing. The bearing block 16 is an important component of the second nut 4. It provides a platform for installation and support of other components. The mounting hole 24 facilitates the installation of other components. The assembly key 22 plays a key role in the installation and positioning of the extrusion block 6. The assembly groove 23 is designed to be used in conjunction with the assembly key 22. When the extrusion block 6 is installed on the second nut 4, the assembly key 22 can be inserted into the assembly groove 23 to achieve precise positioning and fixing. The shape and size of the assembly groove 23 match the assembly key 22 to ensure a tight and stable fit between the two.

[0039] Please see the attached Figure 4 - Attachment Figure 6 The right end of the screw 1 is fixedly connected to a fixed column 18, the outer wall of the second nut 4 is fixedly connected to an observation window 17, the top of the rotating column 13 is fixedly connected to a crosshead 14, the outer wall of the pre-tightening block 5 is provided with an operating hole 21, a plurality of balls 7 are provided inside the second nut 4, and the outer wall of the outer cover 205 is fixedly connected to a sealing sleeve 25;

[0040] Specifically, the fixing column 18 plays an important connecting and fixing role in the double-nut ball screw and can be used to connect other components. The observation window 17 can observe the working conditions inside the double-nut ball screw, and can monitor the movement state, lubrication condition and abnormal wear of the ball 7 in real time, and take corresponding maintenance measures in time to ensure the normal operation of the ball screw. The crosshead 14 facilitates operation of the rotating column 13, and the function of the sealing sleeve 25 is to prevent dust, impurities and moisture from entering the interior of the double-nut ball screw.

[0041] Working principle: The pre-tightening block 5 can make the balls 7 inside the first nut 3 and the second nut 4 closely contact the threads on the screw 1, maintain a certain pre-tightening force, and improve the rigidity, precision and transmission stability of the ball screw. When the balls 7 are slightly worn and affect the precision, the crosshead 14 is rotated, and the threaded sleeve 10 moves upward. Under the joint action of the lower connecting rod 8 and the upper connecting rod 12, the U-shaped block 11 opens outward, pushing the two extrusion blocks 6 to open, thereby expanding the distance between the first nut 3 and the second nut 4, eliminating the gap, and realizing the adjustment of the pre-tightening force to keep it in good working condition.

[0042] When the ball 7 is severely worn and affects the equipment, open the outer cover 205 and take out the fixed tube 202. At this time, the severely worn ball 7 can be taken out and replaced with a good ball 7, which is placed in the ball track. Finally, the ball 7 is placed in the fixed tube 202, and the protrusion 203 is aligned with the groove 204 and placed in the disassembly groove 201. The clamping block 206 and the outer cover 205 are pressed tightly, so that the two ends of the fixed tube 202 are aligned with the track of the ball 7. Finally, the outer cover 205 is fixed to complete the replacement of the ball 7, which can effectively ensure the normal operation of the ball screw and extend its service life.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-nut ball screw, comprising a screw (1), characterized in that: The left side of the middle part of the lead screw (1) is threadedly connected to a first nut (3), and the right side of the middle part of the lead screw (1) is threadedly connected to a second nut (4). A pre-tightening block (5) is fixedly connected between the first nut (3) and the second nut (4). The inner wall of the pre-tightening block (5) is slidably connected to a plurality of extrusion blocks (6). An adjacent side of the extrusion block (6) is fixedly connected to a U-shaped block (11). The inner wall of the U-shaped block (11) is fixedly connected to a connecting column (15). The outer wall of the connecting column (15) is rotatably connected to an upper connecting rod (12). The upper connecting rod ( The other end of the second nut (4) is rotatably connected to a threaded sleeve (10), the middle part of the threaded sleeve (10) is rotatably connected to a rotating column (13), the bottom of the rotating column (13) is provided with a threaded groove (9), the outer wall of the threaded groove (9) is threadedly connected to the threaded sleeve (10), the outer wall of the threaded sleeve (10) is rotatably connected to a lower connecting rod (8), the other end of the lower connecting rod (8) is rotatably connected to the outer wall of the pre-tightening block (5), and the outer wall of the second nut (4) is provided with a detachable structure (2), and the detachable structure (2) is used to disassemble the nut shell.

2. The double-nut ball screw according to claim 1, characterized in that: The detachable structure (2) comprises a disassembly groove (201), the disassembly groove (201) being provided on the outer wall of the second nut (4), a plurality of fixing tubes (202) being provided on the inner wall of the disassembly groove (201), a protrusion (203) being fixedly connected to the upper end of the outer wall of the fixing tube (202), a groove (204) being provided at the lower end of the fixing tube (202), an outer cover (205) being engaged with the inner wall of the disassembly groove (201), and a pressing block (206) being fixedly connected to the bottom of the outer cover (205).

3. The double-nut ball screw according to claim 1, characterized in that: The left end of the lead screw (1) is fixedly connected to a mounting column (19), and a notch (20) is provided on the outer wall of the mounting column (19).

4. The double-nut ball screw according to claim 1, characterized in that: One end of the second nut (4) is fixedly connected to a bearing block (16), and an outer wall of the bearing block (16) is provided with a mounting hole (24).

5. The double-nut ball screw according to claim 1, characterized in that: An assembly key (22) is fixedly connected to the outer wall of the extrusion block (6), and an assembly groove (23) is provided on the outer wall of the second nut (4).

6. The double-nut ball screw according to claim 1, characterized in that: The right end of the lead screw (1) is fixedly connected to a fixing column (18), and the outer wall of the second nut (4) is fixedly connected to an observation window (17).

7. The double-nut ball screw according to claim 1, characterized in that: A crosshead (14) is fixedly connected to the top of the rotating column (13), and an operating hole (21) is opened on the outer wall of the pre-tightening block (5).

8. The double-nut ball screw according to claim 2, characterized in that: A plurality of balls (7) are provided inside the second nut (4), and a sealing sleeve (25) is fixedly connected to the outer wall of the outer cover (205).

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