Ball screw pre-tightening device of numerical control machine tool

Abstract

The utility model discloses a ball screw pre-tightening device of a numerical control machine tool, and relates to the technical field of ball screws. The lead screw comprises a lead screw body, a lead screw nut and a pre-tightening nut, the lead screw nut and the pre-tightening nut are installed on the peripheral side face of the lead screw body, a gasket is installed between the lead screw nut and the pre-tightening nut, the pre-tightening nut comprises a first assembly and a second assembly, and first pressing grooves are formed in the two sides of the lead screw nut respectively. Second pressing grooves are formed in one surface of the first assembly and one surface of the second assembly, and flat keys are jointly installed between the first pressing grooves and the second pressing grooves. Through the flat key and the pressing key screw structure, the first assembly and the second assembly can be conveniently installed and detached from the lead screw nut, meanwhile, the first assembly and the second assembly can be conveniently detached in cooperation with the connecting plate, the extending plate and the clamping plate structure, the pre-tightening nut is made to be separated from the lead screw body, and a gasket can be conveniently added; and the screw rod body does not need to be disassembled, so that the use convenience and the working efficiency of the device are improved.

Description

Technical Field

[0001] This utility model belongs to the field of ball screw technology, and in particular relates to a ball screw preload device for CNC machine tools. Background Technology

[0002] Ball screws are ideal products for converting rotary motion into linear motion, or vice versa. They are the most commonly used transmission components in machine tools and precision machinery. Their main function is to convert rotary motion into linear motion, or torque into axial reciprocating force, while also possessing the characteristics of high precision, reversibility, and high efficiency. Due to their very low frictional resistance, ball screws are widely used in various industrial equipment and precision instruments.

[0003] In the prior art, when using the double-nut preload method, the preload is generally adjusted by adding a shim between the two nuts. However, the existing nut installation method is relatively fixed and inconvenient to disassemble, making it difficult to quickly insert the adjusting shim and hindering subsequent adjustments. Therefore, a ball screw preload device for CNC machine tools is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a ball screw preload device for CNC machine tools to solve existing problems.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a ball screw preload device for CNC machine tools, comprising a screw body, a screw nut, and a preload nut. The screw nut and preload nut are mounted on the circumferential side of the screw body and are threadedly connected to the screw body. A washer is installed between the screw nut and the preload nut. The preload nut includes a first component and a second component, which are arranged opposite to each other. A first pressure groove is formed on both sides of the screw nut, and a second pressure groove is formed on one surface of both the first and second components. The positions of the two second pressure grooves correspond to the positions of the two first pressure grooves. A flat key is installed between the first and second pressure grooves.

[0007] Furthermore, both ends of the two flat keys are screwed with key screws, and one end of each key screw penetrates a surface of the flat key and is screwed between the first key groove and the second key groove, respectively.

[0008] Furthermore, each of the first and second components has two connecting slots on its opposite surfaces, and a connecting plate is slidably installed between the two connecting slots.

[0009] Furthermore, the two connecting plates are arc-shaped plate structures, and extension plates are welded to the arc-shaped surfaces of the two connecting plates. One end of each extension plate extends to the outside of the preload nut.

[0010] Furthermore, each of the four connecting slots has two slots on one surface, and each of the two slots has a card plate engaged inside.

[0011] Furthermore, a connecting flange is welded to one end of the lead screw nut, a coupling is connected to one end of the lead screw body via a keyway, and a mounting base is rotatably mounted on one end of the coupling. The mounting base is an "L"-shaped plate structure.

[0012] Furthermore, a drive motor is bolted to one end of the mounting base, the output end of the drive motor is fixedly connected to one end of the coupling, and a bearing plate is bolted to one end of the upper surface of the mounting base.

[0013] Furthermore, the bearing plate is connected to the other end of the lead screw body, and the other end of the lead screw body is rotatably connected to the bearing plate.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model uses a flat key and a key screw structure to facilitate the installation and disassembly of the first and second components with the lead screw nut. It also facilitates the use of a connecting plate, extension plate and clamping plate structure to separate the first and second components, so that the preload nut can be separated from the lead screw body, making it easy to add a washer without disassembling the lead screw body, thus improving the ease of use and work efficiency of the device.

[0016] 2. This utility model improves the stability of the first and second components during assembly through the connecting groove and connecting plate structure, avoids loosening when the first and second components are used together, and ensures the stability of the pre-tightening device during use.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a ball screw preload device for a CNC machine tool according to the present invention;

[0020] Figure 2This utility model Figure 1 Enlarged structural diagram at point A;

[0021] Figure 3 This is a top view schematic diagram of the ball screw preload device for a CNC machine tool according to the present invention;

[0022] Figure 4 This utility model Figure 3 A schematic diagram of the cross-sectional structure at point AA.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Lead screw body; 2. Lead screw nut; 201. Connecting flange; 202. First pressure groove; 203. Gasket; 3. Preload nut; 301. First assembly; 302. Second assembly; 303. Second pressure groove; 304. Flat key; 305. Key screw; 306. Connecting groove; 307. Connecting plate; 308. Extension plate; 309. Slot; 310. Slot plate; 4. Mounting base; 5. Coupling; 6. Drive motor; 7. Bearing plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Please see Figures 1-4As shown, this utility model is a ball screw preload device for a CNC machine tool, including a screw body 1, a screw nut 2, and a preload nut 3. The screw nut 2 and the preload nut 3 are installed on the circumferential side of the screw body 1, and are threadedly driven to the screw body 1. A washer 203 is installed between the screw nut 2 and the preload nut 3. The preload nut 3 includes a first component 301 and a second component 302, which are arranged opposite to each other. A first pressure groove 202 is provided on both sides of the screw nut 2. The first component 301 and the second component 302 are arranged opposite to each other. A first pressure groove 202 is provided on both sides of the screw nut 2. Each of the two components 302 has a second pressure groove 303 on one surface. The positions of the two second pressure grooves 303 correspond to the positions of the two first pressure grooves 202. A flat key 304 is installed between the first pressure grooves 202 and the second pressure grooves 303 to facilitate the installation and disassembly of the first component 301 and the second component 302 with the lead screw nut 2. By separating the first component 301 and the second component 302, the preload nut 3 can be separated from the lead screw body 1, making it easy to add the washer 203 without disassembling the lead screw body 1, thus improving the ease of use and work efficiency of the device.

[0028] Both ends of the two flat keys 304 are screwed with key screws 305. One end of each key screw 305 passes through a surface of the flat key 304 and is screwed between the first key groove 202 and the second key groove 303 respectively. The opposite surfaces of the first component 301 and the second component 302 are each provided with two connecting grooves 306. A connecting plate 307 is slidably installed between the two connecting grooves 306.

[0029] The two connecting plates 307 are arc-shaped plate structures, and extension plates 308 are welded to the arc surfaces of the two connecting plates 307. One end of the two extension plates 308 extends to the outside of the preload nut 3.

[0030] Each of the four connecting slots 306 has two slots 309 on one surface. Each slot 309 has a retaining plate 310 inside, which improves the stability of the first component 301 and the second component 302 during assembly, prevents the first component 301 and the second component 302 from loosening when used together, and ensures the stability of the pre-tightening device during use.

[0031] A connecting flange 201 is welded to one end of the lead screw nut 2, and a coupling 5 is connected to one end of the lead screw body 1 via a keyway. A mounting base 4 is rotatably mounted on one end of the coupling 5, and the mounting base 4 is an "L" shaped plate structure.

[0032] One end of the mounting base 4 is fitted with a drive motor 6 by bolts. The output end of the drive motor 6 is fixedly connected to one end of the coupling 5. One end of the upper surface of the mounting base 4 is fitted with a bearing plate 7 by bolts. The bearing plate 7 is connected to the other end of the lead screw body 1. The other end of the lead screw body 1 is rotatably connected to the bearing plate 7.

[0033] Please see Figures 1-4As shown, this utility model is a ball screw preload device for CNC machine tools. Its usage method is as follows: When it is necessary to add or replace the shim 203, first loosen the key screw 305 and remove it from the first and second key grooves 303. Then, remove the two flat keys 304 from the first and second key grooves 202 and 303. At this time, the preload nut 3 is separated from the screw nut 2. Then, remove the four retaining plates 310 from the four retaining slots 309 respectively. Push the extension plates 308 above and below the preload nut 3 in sequence. When pushing, the extension plates 308 slide along the gap between the first component 301 and the second component 302. When the extension plates 308 move, they drive the connecting plate 307 to slide inside the connecting groove 306. After the connecting plate 307 is completely removed, the first component 301 and the second component 302 are disengaged from the lead screw body 1. At this time, add or remove the plug-in shim 203 for replacement. After the operation is completed, repeat the above steps to install the preload nut 3.

[0034] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A ball screw preload device for a CNC machine tool, comprising a screw body (1), a screw nut (2), and a preload nut (3), characterized in that: The lead screw nut (2) and the preload nut (3) are installed on the circumferential side of the lead screw body (1). The lead screw nut (2) and the preload nut (3) are threadedly driven with the lead screw body (1). A washer (203) is installed between the lead screw nut (2) and the preload nut (3). The preload nut (3) includes a first component (301) and a second component (302). The first component (301) and the second component (302) are arranged opposite to each other. The lead screw nut (2) has a first pressure groove (202) on both sides. The first component (301) and the second component (302) have a second pressure groove (303) on one surface. The positions of the two second pressure grooves (303) correspond to the positions of the two first pressure grooves (202). A flat key (304) is installed between the first pressure groove (202) and the second pressure groove (303).

2. The ball screw preload device for a CNC machine tool according to claim 1, characterized in that, Both ends of the two flat keys (304) are screwed with key screws (305), and one end of the two key screws (305) passes through a surface of the flat key (304) and is screwed between the first key groove (202) and the second key groove (303) respectively.

3. The ball screw preload device for a CNC machine tool according to claim 1, characterized in that, The first component (301) and the second component (302) each have two connecting slots (306) on their opposite surfaces, and a connecting plate (307) is slidably installed between the two connecting slots (306).

4. The ball screw preload device for a CNC machine tool according to claim 3, characterized in that, The two connecting plates (307) are arc-shaped plate structures, and extension plates (308) are welded to the arc surfaces of the two connecting plates (307). One end of the two extension plates (308) extends to the outside of the preload nut (3).

5. A ball screw preload device for a CNC machine tool according to claim 3, characterized in that, Each of the four connecting slots (306) has two slots (309) on one surface, and each of the two slots (309) has a card plate (310) inside.

6. The ball screw preload device for a CNC machine tool according to claim 1, characterized in that, The lead screw nut (2) has a connecting flange (201) welded to one end, and the lead screw body (1) has a coupling (5) connected to one end via a keyway. The coupling (5) has a mounting base (4) rotatably mounted on one end, and the mounting base (4) is an "L" shaped plate structure.

7. A ball screw preload device for a CNC machine tool according to claim 6, characterized in that, One end of the mounting base (4) is fitted with a drive motor (6) by bolts. The output end of the drive motor (6) is fixedly connected to one end of the coupling (5). One end of the upper surface of the mounting base (4) is fitted with a bearing plate (7) by bolts.

8. A ball screw preload device for a CNC machine tool according to claim 7, characterized in that, The bearing plate (7) is connected to the other end of the lead screw body (1), and the other end of the lead screw body (1) is rotatably connected to the bearing plate (7).

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