Gap eliminating mechanism for lead screw nut pair of numerically controlled lathe

Abstract

The utility model relates to the technical field of numerical control machine tools, and discloses a numerical control lathe lead screw nut pair gap eliminating mechanism which comprises a base, two baffles are fixedly connected to the surface of the base, a lead screw is rotationally connected to the surfaces of the baffles, and a nut is in threaded connection with the middle of the surface of the lead screw. And a pre-tightening mechanism is installed on one side of the nut, a connecting plate is slidably connected to the bottom of the pre-tightening mechanism, an adjusting mechanism is fixedly connected to one side of the connecting plate, and a graduated scale is installed on the surface of the connecting plate. According to the clearance eliminating mechanism for the lead screw nut pair of the numerical control lathe, through the arrangement of the pre-tightening mechanism, when the clearance eliminating mechanism is used, the pre-tightening springs and the pre-tightening blocks are arranged on the two sides of the nut, the pre-tightening blocks are used for extruding the pre-tightening springs on one side, the clearance between a lead screw and the nut is effectively eliminated, and the transmission precision is improved; it is ensured that the lead screw can keep stable pre-tightening force during positive and negative rotation, and idle stroke errors are avoided.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, and in particular to a mechanism for eliminating backlash in a CNC lathe lead screw and nut pair. Background Technology

[0002] In CNC lathes, the lead screw and nut pair is a key component of the transmission system, and its accuracy directly affects the machining accuracy of the machine tool. Due to long-term use or manufacturing errors, gaps may develop between the lead screw and nut, leading to backlash errors during transmission and affecting machining accuracy.

[0003] Existing gap elimination methods typically employ preload nuts or elastic elements for compensation, but these methods suffer from problems such as complex adjustment and poor stability. Therefore, designing a gap elimination mechanism that is simple in structure, easy to adjust, and highly stable is of great significance. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The purpose of this utility model is to provide a backlash elimination mechanism for CNC lathe lead screw and nut pairs, which solves the problems mentioned in the background art, where existing backlash elimination methods typically use pre-tightened nuts or elastic elements for compensation, but these methods have problems such as complex adjustment and poor stability.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a backlash elimination mechanism for a CNC lathe lead screw and nut pair, comprising a base, two baffles fixedly connected to the surface of the base, a lead screw rotatably connected to the surface of the baffles, a nut threadedly connected to the center of the lead screw, a pre-tightening mechanism mounted on one side of the nut, a connecting plate slidably connected to the bottom of the pre-tightening mechanism, an adjusting mechanism fixedly connected to one side of the connecting plate, a scale mounted on the surface of the connecting plate, the pre-tightening mechanism including a pre-tightening spring mounted on one side of the nut, a pre-tightening block fixedly connected to one side of the pre-tightening spring; the adjusting mechanism including a bracket fixedly connected to one side of the connecting plate, a threaded rod threadedly connected to the upper surface of the bracket, a rotating handle fixedly connected to one end of the threaded rod, and the other end of the threaded rod overlapping the surface of the pre-tightening block.

[0008] As a further embodiment of this utility model, the surface of the pre-tightening block is provided with a through hole, and the lead screw passes through the inside of the through hole. The pre-tightening block is designed to compress the pre-tightening spring.

[0009] As a further embodiment of this utility model, the bottom of the pre-tightening block is fixedly connected to an I-beam block, and the I-beam block is slidably connected to an I-beam groove on the surface of the connecting plate. The I-beam groove serves to limit the movement of the I-beam block.

[0010] As a further embodiment of this utility model, a pointer is fixedly connected to one side of the connecting plate, and the pointer slides on the surface of the scale. The pointer facilitates observation of the deformation degree of the pre-tension spring.

[0011] As a further embodiment of this utility model, a drive motor is fixedly connected to one side of the lead screw, and a motor housing is fixedly connected to the surface of the drive motor. The drive motor serves to drive the lead screw to rotate.

[0012] As a further embodiment of this utility model, the top of the nut is threadedly connected to a placement plate, and limit holes are provided on both sides of the placement plate. Limit rods are slidably connected inside the limit holes, and the placement plate is limited by the setting of the limit rods.

[0013] As a further embodiment of this utility model, four positioning holes are provided on both sides of the surface of the base. The positioning holes are connected to the external connection structure by bolts, and the positioning holes serve to fix the equipment.

[0014] (III) Beneficial Effects

[0015] This utility model provides a backlash elimination mechanism for lead screw and nut pairs in CNC lathes, which has the following beneficial effects:

[0016] 1. The CNC lathe lead screw and nut pair backlash elimination mechanism, through the setting of the preload mechanism, has preload springs and preload blocks on both sides of the nut during use. The preload blocks squeeze the preload spring on one side, effectively eliminating the backlash between the lead screw and the nut, improving transmission accuracy. The bidirectional preload structure ensures that the lead screw can maintain a stable preload force when rotating in both directions, avoiding backlash error.

[0017] 2. The CNC lathe lead screw and nut pair backlash elimination mechanism, through the adjustment mechanism and scale settings, allows the rotating handle on the support surface to be rotated during use. This rotating handle drives the threaded rod at the end to move, pushing the preload block on one side to move during the movement, thereby changing the compression of the preload spring. With the help of the scale set at the bottom of the preload block, the deformation length of the preload spring can be clearly observed, avoiding mechanism failure caused by excessive compression or insufficient preload. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the placement plate structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the pre-tightening mechanism of this utility model;

[0021] Figure 4 This is a schematic diagram of the drive motor structure of this utility model.

[0022] In the diagram: 1. Base; 2. Baffle; 3. Lead screw; 4. Nut; 5. Preload mechanism; 501. Preload spring; 502. Preload block; 6. Connecting plate; 7. Adjustment mechanism; 701. Bracket; 702. Threaded rod; 703. Rotating handle; 8. Scale; 9. Pointer; 10. Drive motor; 11. Motor box; 12. Placement plate; 13. Limiting rod; 14. I-beam block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1 to 4 This utility model provides a technical solution: a backlash elimination mechanism for a CNC lathe lead screw and nut pair, comprising a base 1, two baffles 2 fixedly connected to the surface of the base 1, a lead screw 3 rotatably connected to the surface of the baffles 2, a nut 4 threadedly connected to the center of the surface of the lead screw 3, a preload mechanism 5 installed on one side of the nut 4, the preload mechanism 5 is used to avoid backlash error, a connecting plate 6 is slidably connected to the bottom of the preload mechanism 5, and an adjusting mechanism 7 is fixedly connected to one side of the connecting plate 6, the adjusting mechanism 7 and a scale 8 are used to eliminate backlash error. To avoid mechanism failure due to excessive compression or insufficient preload, a scale 8 is installed on the surface of the connecting plate 6. The preload mechanism 5 includes a preload spring 501 installed on one side of the nut 4, and a preload block 502 is fixedly connected to one side of the preload spring 501. The adjustment mechanism 7 includes a bracket 701 fixedly connected to one side of the connecting plate 6. A threaded rod 702 is threadedly connected to the upper surface of the bracket 701. A rotating handle 703 is fixedly connected to one end of the threaded rod 702, and the other end of the threaded rod 702 overlaps the surface of the preload block 502.

[0025] The surface of the preload block 502 has a through hole, and the lead screw 3 passes through the inside of the through hole. The preload block 502 is designed to compress the preload spring 501.

[0026] The bottom of the pre-tightening block 502 is fixedly connected to an I-beam block 14. The I-beam block 14 is slidably connected to the surface of the connecting plate 6, which has an I-beam groove. The I-beam groove serves to limit the movement of the I-beam block 14.

[0027] A pointer 9 is fixedly connected to one side of the connecting plate 6. The sliding connection port of the pointer 9 is on the surface of the scale 8. The pointer 9 is designed to facilitate observation of the deformation degree of the preload spring 501.

[0028] A drive motor 10 is fixedly connected to one side of the lead screw 3, and a motor housing 11 is fixedly connected to the surface of the drive motor 10. The drive motor 10 drives the lead screw 3 to rotate.

[0029] The top of the nut 4 is threadedly connected to a placement plate 12. Limiting holes are opened on both sides of the placement plate 12. A limiting rod 13 is slidably connected inside the limiting holes. The setting of the limiting rod 13 plays the role of limiting the placement plate 12.

[0030] Four positioning holes are provided on both sides of the surface of the base 1. The positioning holes are connected to the external connection structure by bolts. The positioning holes serve to fix the equipment.

[0031] In this invention, the working steps of the device are as follows:

[0032] First step: When in use, preload springs 501 and preload blocks 502 are set on both sides of nut 4. The preload blocks 502 squeeze the preload springs 501 on one side, effectively eliminating the gap between the lead screw 3 and nut 4, improving transmission accuracy. The bidirectional preload structure ensures that the lead screw 3 can maintain a stable preload force when rotating in both directions.

[0033] The second step: When using it, the rotating handle 703 on the surface of the bracket 701 can be rotated, so that the rotating handle 703 drives the threaded rod 702 at the end to move, and pushes the preload block 502 on one side to move during the movement, thereby changing the compression of the preload spring 501. With the help of the scale 8 set at the bottom of the preload block 502, the deformation length of the preload spring 501 can be clearly observed.

[0034] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.

[0035] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backlash elimination mechanism for a CNC lathe lead screw and nut pair, comprising a base (1), characterized in that: Two baffles (2) are fixedly connected to the surface of the base (1). A lead screw (3) is rotatably connected to the surface of the baffles (2). A nut (4) is threadedly connected to the middle of the surface of the lead screw (3). A pre-tightening mechanism (5) is installed on one side of the nut (4). A connecting plate (6) is slidably connected to the bottom of the pre-tightening mechanism (5). An adjusting mechanism (7) is fixedly connected to one side of the connecting plate (6). A scale (8) is installed on the surface of the connecting plate (6). The pre-tightening mechanism (5) includes a pre-tightening spring (501) installed on one side of the nut (4), and a pre-tightening block (502) is fixedly connected to one side of the pre-tightening spring (501); The adjustment mechanism (7) includes a bracket (701) fixedly connected to one side of the connecting plate (6). A threaded rod (702) is threadedly connected to the upper surface of the bracket (701). A rotating handle (703) is fixedly connected to one end of the threaded rod (702), and the other end of the threaded rod (702) overlaps the surface of the pre-tightening block (502).

2. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: The surface of the preload block (502) has a through hole, and the lead screw (3) passes through the inside of the through hole.

3. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: The bottom of the pre-tightening block (502) is fixedly connected to an I-beam block (14), which is slidably connected to the connecting plate (6) in an I-beam groove.

4. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: A pointer (9) is fixedly connected to one side of the connecting plate (6), and the pointer (9) slides on the surface of the scale (8).

5. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: A drive motor (10) is fixedly connected to one side of the lead screw (3), and a motor housing (11) is fixedly connected to the surface of the drive motor (10).

6. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: The top of the nut (4) is threadedly connected to a placement plate (12), and limit holes are opened on both sides of the placement plate (12). A limit rod (13) is slidably connected inside the limit hole.

7. The backlash elimination mechanism for a CNC lathe lead screw and nut pair according to claim 1, characterized in that: The base (1) has four positioning holes on both sides of its surface, and the positioning holes are connected to the external connection structure by bolts.

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