Ball screw for machine tool

Abstract

The utility model relates to the technical field of mechanical transmission parts, and discloses a ball screw for a machine tool, which comprises a positioning device, a dust cover, a ball device and a screw rod, the positioning device is inserted at the tail end of the screw rod through a positioning block, the ball device is in sliding fit with the screw rod, and the dust cover is clamped at the tail end of the screw rod. The stability of the ball screw is improved when a machine tool is used for machining, the sealing performance is improved, and chippings are not prone to entering in the machining process of the machine tool.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical transmission parts, in particular to a ball screw for machine tools. Background Technique

[0002] The ball screw is an ideal product that converts rotary motion into linear motion or vice versa. It consists of a screw rod, a nut, and balls. Its function is to convert rotary motion into linear motion, which is a further extension and development of the ball screw. The significance of this development is to change the bearing from a rolling action to a sliding action. Due to its very small frictional resistance, the ball screw is widely used in various industrial equipment and precision instruments.

[0003] The existing ball screw includes a screw rod, a nut sleeved on the screw rod shaft, and a plurality of reversers spaced and combined on the nut. A plurality of balls are arranged in sequence between the nut and the screw rod. However, for high-strength machine tools, this design lacks sealing and stability, resulting in the screw rod being easily disengaged or iron filings entering the reverser. For this reason, we propose a ball screw for machine tools. Summary of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a ball screw for machine tools, which solves the above problems.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the utility model provides the following technical solutions: a ball screw for machine tools, a positioning device, a dust cover, a ball device, and a screw rod, characterized in that: the positioning device is inserted at the end position of the screw rod through a positioning block, the ball device is slidably matched with the screw rod, and the dust cover is clamped at the end position of the screw rod.

[0008] Preferably, positioning shafts are arranged around the positioning device. The positioning shafts are inserted at the end position of the positioning device. A coil is fixedly connected at the middle position of the positioning shafts. A connecting rod 1 is arranged at the gap between the middle position of the positioning shafts and the upper side position of the positioning device. And a positioning block is fixedly connected at the upper end position of the positioning shafts. A U-shaped part is arranged outside the connecting rod 1. A connecting rod 2 is inserted at the middle position of the coil.

[0009] Preferably, the connecting rod 1 is fixedly connected to the positioning shaft and inserted into the positioning device. The U-shaped part is fixedly connected to the surface of the positioning shaft and is also fixedly connected to the surface of the positioning device.

[0010] Preferably, a first positioning groove is provided inside the positioning device, the first positioning groove is adapted to the milled plane on the lead screw, and the positioning block is inserted into a second positioning groove at the position of the positioning disk on the lead screw.

[0011] Preferably, the positioning disk is a circular shaft provided at the end of the lead screw. The surface of the positioning disk is provided with a second positioning groove, and a second buckle is symmetrically arranged at an angle outside the positioning disk in a ball device group. The second positioning groove is four symmetric equilateral triangular grooves.

[0012] Preferably, the dust cover is a circular cover. A circular groove having the same diameter as the lead screw shaft is provided at the middle position of the upper end of the dust cover. A first buckle is symmetrically arranged at an angle on the lower side of the bottom end of the dust cover, and the first buckle is in snap-fit with the second buckle provided on the positioning disk.

[0013] Preferably, sliding bearings are installed at the center positions of the front and rear ends of the ball device.

[0014] (III) Beneficial effects

[0015] Compared with the prior art, the utility model provides a ball screw for a machine tool, which has the following beneficial effects:

[0016] For the ball screw for a machine tool, through the cooperation between the positioning device, the dust cover, the ball device and the lead screw, the lead screw is inserted into the pipe orifice of the positioning device. Under the positioning of the first positioning groove and the milled plane, the positioning device is clamped to the second positioning groove of the lead screw through the positioning block. And when the lead screw is inserted into the positioning device, the first connecting rod in the positioning device is extruded out of the inner pipe orifice of the positioning device, realizing the snap connection between the positioning block and the second positioning groove. Then, the dust cover is passed through the lead screw, and through the mutual cooperation between the first buckle and the second buckle, the dust cover is clamped to the positioning disk. The ball device is slidably fitted on the lead screw. And because sliding bearings are installed at the center positions of the front and rear ends of the ball device, it is possible to preferably prevent iron filings from entering and improve the stability of the ball screw during machine tool processing. Brief description of the drawings

[0017] Figure 1 is a schematic structural diagram of the utility model;

[0018] Figure 2 is a schematic diagram of the positioning device of the structure of the utility model;

[0019] Figure 3 is a schematic diagram of the dust cover of the structure of the utility model;

[0020] Figure 4 is a schematic diagram of the pipe shaft of the structure of the utility model.

[0021] In the figure: 1. Positioning device; 2. Dust cover; 3. Ball device; 4. Lead screw; 5. Positioning block; 6. Positioning shaft; 7. First positioning groove; 8. First connecting rod; 9. Coil; 10. Second connecting rod; 11. U-shaped part; 12. First buckle; 13. Circular groove; 14. Second buckle; 15. Positioning disc; 16. Second positioning groove; 17. Milled flat surface. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-4 , a ball screw for a machine tool, including a positioning device 1, a dust cover 2, a ball device 3 and a lead screw 4, characterized in that: the positioning device 1 is inserted at the end of the lead screw 4 through a positioning block 5, the ball device 3 is slidably fitted on the lead screw 4, and the dust cover 2 is clamped at the end of the lead screw 4.

[0024] Furthermore, a positioning shaft 6 is arranged around the positioning device 1, the positioning shaft 6 is inserted at the end of the positioning device 1, a coil 9 is fixedly connected to the middle position of the positioning shaft 6, a first connecting rod 8 is arranged in the gap between the upper side of the positioning shaft 6 and the positioning device 1, and a positioning block 5 is fixedly connected to the upper end of the positioning shaft 6. A U-shaped part 11 is arranged outside the first connecting rod 8, and a second connecting rod 10 is inserted into the middle position of the coil 9. The U-shaped part 11 has elasticity and can return to a stable state after the stretching or compression state ends.

[0025] Furthermore, the first connecting rod 8 is fixedly connected to the positioning shaft 6 and inserted into the positioning device 1, the U-shaped part 11 is fixedly connected to the surface of the positioning shaft 6, and the U-shaped part 11 is fixedly connected to the surface of the positioning device 1.

[0026] Furthermore, a first positioning groove 7 is arranged inside the positioning device 1, the first positioning groove 7 cooperates with the milled flat surface 17 on the lead screw 4, and the positioning block 5 is inserted into the second positioning groove 16 at the position of the positioning disc 15 on the lead screw 4.

[0027] Furthermore, the positioning disc 15 is a circular shaft arranged at the end of the lead screw 4, a second positioning groove 16 is arranged on the surface of the positioning disc 15, and four symmetric second buckles 14 are arranged outside the positioning disc 15 at an angle symmetric to the ball device 3. The second positioning groove 16 is four symmetric equilateral triangle grooves. When the positioning block 5 passes through the second positioning groove 16, under the action of the U-shaped part 11, the positioning block 5 will be clamped in the second positioning groove 16.

[0028] Furthermore, the dust cover 2 is a circular cover. A circular groove 13 with the same shaft diameter size as the lead screw 4 is provided at the middle position of the upper end of the dust cover 2. At the lower side position of the bottom end of the dust cover 2, symmetrically angled snap fasteners one 12 are provided, and the snap fasteners one 12 are in snap-fit connection with the snap fasteners two 14 provided on the positioning disk 15. The circular groove 13 provided in the middle of the dust cover 2 facilitates the dust cover 2 to pass through the lead screw 4. Through the mutual cooperation of the snap fasteners one 12 and the snap fasteners two 14, the dust cover 2 is snap-connected to the positioning disk 15.

[0029] Furthermore, sliding bearings are installed at the central positions of the front and rear ends of the ball device 3, which can preferably prevent iron filings from entering.

[0030] Working principle: Insert the lead screw 4 into the pipe orifice of the positioning device 1. Under the positioning of the positioning groove one 7 and the milling plane 17, the positioning device 1 is snap-connected to the positioning groove two 16 of the lead screw 4 through the positioning block 5. And when the lead screw 4 is inserted into the positioning device 1, the connecting rod one 8 in the positioning device 1 is extruded out of the inner pipe orifice of the positioning device 1, realizing the snap connection between the positioning block 5 and the positioning groove two 16. Then pass the dust cover 2 through the lead screw 4. Through the mutual cooperation of the snap fasteners one 12 and the snap fasteners two 14, the dust cover 2 is snap-connected to the positioning disk 15. The ball device 3 is slidably fitted on the lead screw 4. And because sliding bearings are installed at the central positions of the front and rear ends of the ball device 3, iron filings can be preferably prevented from entering. Finally, connect the positioning device 1 to the machine tool connecting piece. When taking it out, twist the dust cover 2 to make the snap fasteners one 12 disengage from the snap fasteners two 14, press the coil 9 to make the connecting rod two 10 inserted in the coil 9 enter the coil 9, and the reduction of the radius of the coil 9 drives the positioning shaft 6 to contract inward, and then the lead screw 4 can be taken out.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ball screw for machine tools, characterized in that: The invention comprises a positioning device (1), a dust cover (2), a ball device (3) and a screw rod (4); the positioning device (1) is plugged into the end position of the screw rod (4) via a positioning block (5); the ball device (3) is slidably fitted on the screw rod (4); and the dust cover (2) is clamped at the end position of the screw rod (4).

2. A ball screw for machine tools according to claim 1, characterized in that: The positioning device (1) is provided with positioning shafts (6) around it, the positioning shafts (6) are inserted at the end positions of the positioning device (1), a coil (9) is fixedly connected at the middle position of the positioning shaft (6), a connecting rod (8) is provided at the gap between the positioning shaft (6) and the upper side of the positioning device (1), and a positioning block (5) is fixedly connected at the upper end position of the positioning shaft (6), a U-shaped piece (11) is provided outside the connecting rod (8), and a connecting rod (10) is inserted at the middle position of the coil (9).

3. A ball screw for machine tools according to claim 2, characterized in that: The connecting rod 1 (8) is fixedly connected to the positioning shaft (6) and inserted into the interior of the positioning device (1), the U-shaped member (11) is fixedly connected to the surface of the positioning shaft (6), and the U-shaped member (11) is fixedly connected to the surface of the positioning device (1).

4. A ball screw for machine tools according to claim 3, characterized in that: The positioning device (1) is provided with a positioning groove (7) therein, the positioning groove (7) being matched with a milling plane (17) on the screw rod (4), and the positioning block (5) being inserted into the positioning groove (16) at the position of the positioning plate (15) on the screw rod (4).

5. A ball screw for machine tools according to claim 4, characterized in that: The positioning plate (15) is a circular shaft arranged at the end of the screw rod (4), and a second positioning groove (16) is arranged on the surface of the positioning plate (15). A second buckle (14) of a ball device (3) with symmetrical angles is arranged on the outer side of the positioning plate (15), and the second positioning groove (16) is four symmetrical regular triangular grooves.

6. A ball screw for machine tools according to claim 5, characterized in that: The dust cover (2) is a circular cover, and a circular groove (13) having the same diameter as the screw rod (4) is provided at the middle position of the upper end of the dust cover (2). A buckle 1 (12) having a symmetrical angle is provided at the lower side position of the bottom end of the dust cover (2), and the buckle 1 (12) is engaged with a buckle 2 (14) provided on the positioning plate (15).

7. The ball screw for machine tool according to claim 1, characterized in that: Sliding bearings are installed at the center positions of the front and rear ends of the ball device (3).

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