Alternating type double-lead-screw driving device for long-stroke machine tool

Abstract

The utility model relates to an alternating type double-lead-screw driving device for a long-stroke machine tool, which belongs to the technical field of numerical control machine tools and comprises a machine tool body component, two groups of transmission mechanisms are symmetrically arranged in the middle of the machine tool body component, and a workbench component is arranged above the two groups of transmission mechanisms. The transmission mechanism comprises a lead screw, a driving assembly reciprocating along the lead screw is installed on the lead screw, the driving assembly comprises a nut base, a plurality of blind holes are formed in the top end of the nut base, and iron cores are arranged in the blind holes in a sliding mode; the workbench assembly comprises a workbench body, two electromagnets are oppositely arranged in the middles of the two ends of the bottom face of the workbench body, the electromagnets are fixedly connected with the workbench body, a plurality of positioning grooves are formed in the bottom faces of the electromagnets, and the positions of the positioning grooves are matched with the positions of the blind holes. The utility model effectively solves the problems of deformation and fracture in the transmission of the long-stroke screw rod of the machine tool in the prior art, and improves the machining precision and efficiency of the machine tool.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machine tool technology, specifically, it relates to an alternating double lead screw drive device for long-stroke machine tools. Background Technology

[0002] With the development and progress of science and technology, the use of large parts in various fields is increasing. Currently, gantry milling machines are generally used for machining large parts. The X-axis transmission mechanism of the moving table gantry milling machine often uses lead screw transmission, which has the advantages of low friction and high transmission efficiency. However, lead screw transmission has many limitations in long strokes. For example, the extended lead screw itself is heavier, especially in the unsupported middle part, which is prone to bending deformation, thereby reducing the linear motion accuracy of the worktable and affecting the machining accuracy of large parts, failing to meet customer requirements. In addition, longer lead screws also have a greater risk of breakage when subjected to transmission force. Existing technology can only use gear and rack transmission, which has lower accuracy and efficiency, when facing long X-axis strokes. Therefore, how to apply lead screw transmission to long stroke machine tools is the technical problem that this utility model needs to solve. Utility Model Content

[0003] To address the technical problems mentioned above, this utility model provides an alternating double lead screw drive device for long-stroke machine tools.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] An alternating double lead screw drive device for a long-stroke machine tool includes a bed assembly, two sets of transmission mechanisms are symmetrically arranged in the middle of the bed assembly, and a worktable assembly is arranged above the two sets of transmission mechanisms.

[0006] The transmission mechanism includes a lead screw, on which a drive assembly is mounted to reciprocate. The drive assembly includes a lead screw seat, and the top of the lead screw seat has several blind holes, in which an iron core is slidably disposed.

[0007] The workbench assembly includes a workbench body. Two electromagnets are disposed opposite each other at the middle of both ends of the bottom surface of the workbench body. The electromagnets are fixedly connected to the workbench body. Several positioning grooves are opened on the bottom surface of the electromagnets. The positions of the positioning grooves are matched with the positions of the blind holes.

[0008] Furthermore, the bed assembly includes a bed body, and a plurality of evenly distributed guide rails are fixedly connected to the top of the bed body, the guide rails being parallel to the length direction of the bed body.

[0009] Furthermore, the lead screw is rotatably mounted above the bed body and parallel to the guide rail, and a drive motor is installed at one end of the lead screw, with the output end of the drive motor fixedly connected to the lead screw.

[0010] Furthermore, the drive assembly also includes a nut that is threadedly connected to the lead screw, and the lead screw seat is sleeved and fixed to the outside of the nut.

[0011] Furthermore, a nylon bushing is provided around the periphery of the iron core. The nylon bushing is fixedly connected to the iron core, and its outer periphery is slidably connected to the blind hole. The low friction between the nylon bushing and the blind hole makes the iron core move more smoothly, thereby improving the reliability of the iron core's operation.

[0012] Furthermore, a spring is provided below the nylon bushing, with one end of the spring fixedly connected to the nylon bushing and the other end of the spring fixedly connected to the bottom of the blind hole. Relying solely on the gravity of the iron core may result in failure to return to its original position in time, leading to a dangerous situation. Therefore, the tension of the spring pulls the iron core wrapped in the nylon bushing back to its initial position, making the return action of the iron core more reliable.

[0013] Furthermore, a number of evenly distributed sliders are fixedly connected to the bottom surface of the workbench body, and the sliders are slidably connected to the guide rail.

[0014] Beneficial effects:

[0015] This invention features two sets of transmission mechanisms on the machine bed. The drive components in these mechanisms are respectively coupled with two electromagnets at the bottom of the worktable. By alternately energizing the two electromagnets, the connection between them and the drive components is switched, shortening the length of a single lead screw. This allows the worktable to reciprocate stably throughout the entire long stroke of the machine bed. Furthermore, by incorporating a magnetically attracted sliding iron core in the lead screw nut and a positioning groove on the electromagnet, the connection between the electromagnet and the lead screw nut becomes more precise and reliable, thus improving the overall machining accuracy and efficiency of the machine tool. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a perspective view of an alternating double lead screw drive device for a long-stroke machine tool according to the present invention.

[0018] Figure 2This is a perspective view of the concealed workbench assembly of this utility model.

[0019] Figure 3 A bottom view of the workbench assembly;

[0020] Figure 4 This is a diagram showing the working state of the worktable body when it switches from one side of the transmission mechanism to the other side.

[0021] Figure 5 This is a diagram showing the working state of the worktable body after it has been switched to the transmission mechanism on the other side.

[0022] Figure 6 This is a schematic diagram showing the state of the electromagnet and the drive assembly when the electromagnet is not energized.

[0023] Figure 7 This is a schematic diagram showing the state of the electromagnet and its driving components when the electromagnet is energized.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Bed assembly; 101. Bed body; 102. Guide rail; 2. Transmission mechanism; 201. Lead screw; 202. Drive assembly; 2021. Nut; 2022. Lead screw nut seat; 2023. Blind hole; 2024. Spring; 2025. Nylon bushing; 2026. Iron core; 203. Drive motor; 3. Worktable assembly; 301. Worktable body; 302. Slider; 303. Electromagnet; 304. Positioning groove. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-7 As shown, an alternating double lead screw drive device for a long-stroke machine tool includes a bed assembly 1, two sets of transmission mechanisms 2 are symmetrically arranged in the middle of the bed assembly 1, and a worktable assembly 3 is arranged above the two sets of transmission mechanisms 2. Under the drive of the transmission mechanisms 2, the worktable assembly 3 can slide a long stroke above the bed assembly 1.

[0028] The bed assembly 1 includes a bed body 101, and a plurality of evenly distributed guide rails 102 are fixedly connected to the top of the bed body 101. The guide rails 102 are parallel to the length direction of the bed body 101.

[0029] The transmission mechanism 2 includes a lead screw 201, which is rotatably mounted above the bed body 101 and parallel to the guide rail 102. A drive motor 203 is mounted on one end of the lead screw 201, and the output end of the drive motor 203 is fixedly connected to the lead screw 201. A drive assembly 202 is mounted on the lead screw 201. The drive assembly 202 includes a nut 2021 that is threadedly connected to the lead screw 201. A lead screw nut seat 2022 is fixedly sleeved on the outside of the nut 2021. Several blind holes 2023 are opened at the top of the lead screw nut seat 2022. A nylon bushing 2025 is slidably arranged in the blind holes 2023. An iron core 2026 is fixedly connected to the center of the nylon bushing 2025. A spring 2024 is arranged below the nylon bushing 2025. One end of the spring 2024 is fixedly connected to the nylon bushing 2025, and the other end of the spring 2024 is fixedly connected to the bottom end of the blind hole 2023.

[0030] The workbench assembly 3 includes a workbench body 301. Several evenly distributed sliders 302 are fixedly connected to the bottom surface of the workbench body 301. The sliders 302 are slidably connected to the guide rail 102. Two electromagnets 303 are oppositely arranged at the middle of both ends of the bottom surface of the workbench body 301. The electromagnets 303 are fixedly connected to the workbench body 301. Several positioning grooves 304 are opened on the bottom surface of the electromagnets 303. The positions of the positioning grooves 304 are matched with the positions of the blind holes 2023.

[0031] Working principle:

[0032] In operation, the worktable body 301 is initially positioned on one side of the bed body 101. An electromagnet 303 on one side of the bottom of the worktable body 301 is energized, while the electromagnet 303 on the other side is de-energized. One electromagnet 303 magnetically fixes the worktable body 301 to the lead screw nut 2022, while simultaneously using magnetic force to drive the iron core 2026 in the lead screw nut 2022 upwards and magnetically fix it in the positioning groove 304, thus firmly connecting the worktable body 301 and the lead screw nut 2022. The drive motor 203 is then activated, and its output drives the lead screw 201 to rotate. The lead screw 201 drives the drive assembly 202 to move, thereby causing the worktable body 301 to slide along the guide rail 102 to the other side.

[0033] When the worktable body 301 reaches the designated position in the middle of the bed body 101, the position of the electromagnet 303 on the other side coincides with that of the drive assembly 202. The electromagnet 303 on the previously energized side is de-energized. At the moment the magnetic force disappears, the iron core 2026 in the nut seat 2022 below it moves rapidly downward under the pull of the spring 2024. The iron core 2026 returns to the blind hole 2023 and is hidden. The electromagnet 303 on this side separates from the drive assembly 202, while the electromagnet 303 on the other side is energized and activated to attract and fix itself to the drive assembly 202 below it. This realizes the alternating use of the two sets of transmission mechanisms 2, so that the worktable body 301 slides back and forth over a long stroke above the bed body 101.

[0034] In the description of this specification, the 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 this utility model. 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 above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. An alternate double screw drive for a long stroke machine tool comprising a bed assembly (1) characterised in that: The middle part of the bed body assembly (1) is symmetrically provided with two groups of transmission mechanisms (2), and the upper part of the two groups of transmission mechanisms (2) is provided with a workbench assembly (3); The transmission mechanism (2) comprises a lead screw (201), a driving assembly (202) reciprocatingly arranged on the lead screw (201), the driving assembly (202) comprising a nut seat (2022), a plurality of blind holes (2023) being formed in the top end of the nut seat (2022), and an iron core (2026) being slidingly arranged in the blind hole (2023); The workbench assembly (3) comprises a workbench body (301), two electromagnets (303) being oppositely arranged at the middle part of the bottom surface of the workbench body (301), the electromagnets (303) being fixedly connected with the workbench body (301), a plurality of positioning grooves (304) being formed in the bottom surface of the electromagnets (303), and the positions of the positioning grooves (304) being matched with the positions of the blind holes (2023).

2. The alternating double screw drive for long stroke machine tools according to claim 1, characterized in that: The bed body assembly (1) comprises a bed body (101), a plurality of evenly distributed guide rails (102) being fixedly connected above the bed body (101), and the guide rails (102) being parallel to the length direction of the bed body (101).

3. An alternating double screw drive for a long stroke machine tool as claimed in claim 2, wherein: The lead screw (201) is rotatably arranged above the bed body (101) and parallel to the guide rails (102), one end of the lead screw (201) being provided with a driving motor (203), and the output end of the driving motor (203) being fixedly connected with the lead screw (201).

4. The alternating double screw drive for long stroke machine tools according to claim 1, wherein: The driving assembly (202) further comprises a nut (2021) threadedly connected with the lead screw (201), and the nut seat (2022) being fixedly sleeved outside the nut (2021).

5. The alternating double screw drive for long stroke machine tools according to claim 1, wherein: The nylon bushing (2025) is fixedly connected with the iron core (2026), and the outer periphery of the nylon bushing (2025) is slidingly connected with the blind hole (2023).

6. An alternating double screw drive for a long stroke machine tool as claimed in claim 5 wherein: The spring (2024) is arranged below the nylon bushing (2025), one end of the spring (2024) being fixedly connected with the nylon bushing (2025), and the other end of the spring (2024) being fixedly connected with the bottom end of the blind hole (2023).

7. The alternating double screw drive for long stroke machine tools according to claim 2, wherein: The bottom surface of the workbench body (301) is fixedly connected with a plurality of evenly distributed sliding blocks (302), and the sliding blocks (302) are slidingly connected with the guide rails (102).

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