Lead screw direct drive motor structure

Abstract

The utility model belongs to the technical field of machine tool equipment, and relates to a lead screw direct-drive motor structure, which comprises a lead screw assembly, the lead screw assembly comprises a lead screw and a lead screw nut, the lead screw is fixed on a base, and the lead screw nut is in threaded connection with the lead screw; the sliding table assembly is arranged on the lead screw in a sleeving mode and arranged on a guide rail parallel to the lead screw in a sliding mode, the sliding table assembly comprises a machine shell, a direct drive motor and a main shaft, the direct drive motor is arranged in the machine shell and drives the main shaft to rotate relative to the machine shell, and the end of the main shaft is fixedly connected with the lead screw nut and drives the lead screw nut to rotate synchronously. The screw rod nut drives the sliding table assembly to move in the axial direction of the screw rod when rotating. The lead screw direct drive motor structure provided by the utility model has the advantages of high displacement precision and more compact structure.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of machine tool equipment relates to a screw rod direct drive motor structure. BACKGROUND

[0002] The slide table of a machine tool is generally driven by a motor and a screw rod, and its general structure includes a driving motor, a ball screw, a screw rod nut, a guide rail, a sliding block and a slide table. The driving motor is in driving connection with the end of the ball screw and drives the rotation of the ball screw. When the ball screw rotates, the screw rod nut connected with it by screwing drives the axial displacement of the screw rod nut, which in turn drives the displacement of the sliding block fixedly connected with the screw rod nut, and finally drives the displacement of the slide table.

[0003] Chinese invention patent application CN116085434A (publication date: May 9, 2023) discloses a typical slide table structure, specifically, a high-acceleration linear ball screw module slide table, which comprises a base, the base comprises a U-shaped groove and an upper cover; a driving mechanism comprising first and second servo motors arranged on both sides of the base; a linear displacement mechanism arranged in the U-shaped groove, comprising a ball screw and a screw rod nut; a sliding support mechanism comprising guide rails arranged on both sides of the ball screw, the guide rails are provided with sliding blocks, the sliding blocks are connected with the screw rod nut, and the sliding blocks are provided with ball channels; a slide table connected with the sliding blocks.

[0004] The driving motor of the existing machine tool slide table is generally arranged on the outside of the module, which needs to occupy a certain installation space. In addition, the transmission structure of the motor and the screw rod and the rotational inertia of the screw rod will affect the displacement accuracy. UTILITY MODEL CONTENTS

[0005] The utility model provides a screw rod direct drive motor structure in view of the deficiency of prior art, has displacement accuracy high, the advantage that structure is more compact.

[0006] To solve the above technical problems, the purpose of the utility model is realized by the following technical scheme:

[0007] A screw rod direct drive motor structure, comprising,

[0008] A screw rod assembly, the screw rod assembly comprises a screw rod and a screw rod nut, the screw rod is fixed to a base, and the screw rod nut is screwed to the screw rod;

[0009] A slide table assembly, the slide table assembly is sleeved on the screw rod and is arranged in sliding mode on a guide rail parallel to the screw rod, the slide table assembly comprises a casing, a direct drive motor and a main shaft, the direct drive motor is arranged in the casing and drives the rotation of the main shaft relative to the casing, the end of the main shaft is fixedly connected with the screw rod nut and drives the synchronous rotation of the screw rod nut, and the screw rod nut drives the axial movement of the slide table assembly along the screw rod when rotating.

[0010] In the above-mentioned lead screw direct drive motor structure, a pair of fixed seats are arranged on the base, and the two ends of the lead screw are fixedly connected with the fixed seats; the guide rails are laid on the base and distributed on the two sides of the lead screw; preferably, the sliding table assembly slides on the guide rails through a plurality of sliding blocks.

[0011] In the above-mentioned lead screw direct drive motor structure, the end of the main shaft extends out of the shell and is provided with a mounting groove matched with the lead screw nut, and the outer edge of the lead screw nut is fixedly connected with the end face of the main shaft through axial fasteners.

[0012] In the above-mentioned lead screw direct drive motor structure, the end of the shell opposite to the lead screw nut is provided with a brake mechanism for braking the main shaft; the brake mechanism adopts a conventional mechanism in the field, such as an electromagnetic brake mechanism, a hydraulic brake mechanism, etc.

[0013] In the above-mentioned lead screw direct drive motor structure, an encoder for detecting the displacement of the sliding table assembly is arranged in the shell; the encoder adopts a conventional encoder in the field.

[0014] In the above-mentioned lead screw direct drive motor structure, bearings for supporting the rotation of the main shaft are arranged between the main shaft and the shell, the end of the shell is provided with an end cover, the mounting cavity of the direct drive motor is formed between the end cover and the shell, and oil seals for sealing the mounting cavity of the direct drive motor are arranged between the main shaft and the end cover.

[0015] In the above-mentioned lead screw direct drive motor structure, a cooling groove corresponding to the direct drive motor is arranged on the shell, a cooling liquid inlet and outlet in communication with the cooling groove is arranged on the shell, and the cooling groove and the cooling liquid inlet and outlet form a cooling circulation flow channel for cooling the direct drive motor.

[0016] In the above-mentioned lead screw direct drive motor structure, a rotary cylinder synchronous with the rotation of the main shaft is sleeved on the main shaft outside the shell, and lubricating oil mist ejection grooves in communication with each other are arranged on the rotary cylinder, the main shaft and the lead screw nut in the radial direction, and the lubricating oil mist ejection grooves spray lubricating oil to the lead screw.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model provides a lead screw direct drive motor structure, adopts fixed lead screw and rotatable lead screw nut structure, builds in the direct drive motor into the shell and directly drives the rotation of the main shaft, the rotation of the main shaft drives the synchronous rotation of the fixedly connected lead screw nut and generates axial displacement, to realize the function of the sliding table. In the utility model, no additional space is needed to install the driving motor, so the structure is more compact; there is no direct transmission structure between the direct drive motor and the lead screw, the lead screw is completely fixed, and the precision decline caused by the transmission structure and the rotational inertia of the lead screw is completely eliminated, so the displacement precision is higher.

[0019] 2、The utility model discloses further increase the brake mechanism, direct drive motor cooling structure and screw rod lubrication structure on the basis of screw rod direct drive motor structure, to obtain better performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the top view of the utility model;

[0021] Figure 2 is the axial section view of Figure 1 ;

[0022] Reference Signs: 1, screw rod;2, screw rod nut;3, guide rail;4, casing;5, direct drive motor;6, main shaft;7, fixed seat;8, fastener;9, brake mechanism;10, encoder;11, bearing;12, end cover;13, oil seal;14, cooling groove;15, cooling liquid inlet and outlet;16, rotary cylinder;17, lubricating oil mist spray out through groove. DETAILED DESCRIPTION

[0023] The utility model will be further described in conjunction with the specific embodiment of the drawings, referring to Figures 1-2 :

[0024] A kind of screw rod direct drive motor structure, comprising,

[0025] Screw rod assembly, the screw rod assembly includes screw rod and screw rod nut, the screw rod is fixed to base, and the screw rod nut is screwed to screw rod;

[0026] Slip table assembly, the slip table assembly is sleeved on screw rod, and is slidably arranged on guide rail parallel to screw rod, and the slip table assembly includes casing, direct drive motor and main shaft, the direct drive motor is arranged in casing and drives main shaft to rotate relative to casing, the end of the main shaft is fixedly connected with screw rod nut and drives screw rod nut to rotate synchronously, and the screw rod nut rotates and drives slip table assembly to move along the axial direction of screw rod.

[0027] In the embodiment, the outer stator assembly of the direct drive motor is fixed relative to the casing, and the inner rotor assembly is fixed relative to the main shaft, the outer stator assembly of the direct drive motor and the casing constitute a fixed part, the inner rotor assembly of the direct drive motor, the main shaft and the screw rod nut constitute a rotating part, and at the same time, the casing is constrained by the guide rail and can only move back and forth along the axial direction of the screw rod;After the direct drive motor is started, the inner rotor assembly drives the main shaft and the screw rod nut to rotate synchronously, the screw rod nut rotates around the screw rod screwed therewith and generates axial displacement, and finally drives the slip table assembly to displace synchronously along the direction defined by the guide rail.

[0028] In the embodiment, the mounting structure of the lead screw and the guide rail is that a pair of fixing bases are arranged on the base, the two ends of the lead screw are fixedly connected with the fixing bases, and the lead screw is completely fixed through the fixing bases; the guide rail is laid on the base and is distributed on the two sides of the lead screw; preferably, the sliding table assembly slides on the guide rail through a plurality of sliding blocks.

[0029] In the embodiment, the mounting structure of the main shaft and the lead screw nut is that the end of the main shaft extends out of the shell and is provided with a mounting groove matched with the lead screw nut, and the outer edge of the lead screw nut is fixedly connected with the end face of the main shaft through an axial fastener.

[0030] In order to ensure the safety of the equipment operation, the end of the shell opposite to the lead screw nut is provided with a brake mechanism for braking the main shaft; the brake mechanism adopts a conventional mechanism in the field, such as an electromagnetic brake mechanism, a hydraulic brake mechanism, etc.; specifically, the rotating part with a friction plate of the brake mechanism is fixedly connected with the main shaft, the fixed part with a brake plate is controlled by electromagnetism and spring, when started, the brake plate is pushed to abut against the friction plate, and the rotation of the main shaft is prevented through the friction torque.

[0031] The shell is provided with an encoder for detecting the displacement of the sliding table assembly; the encoder adopts a conventional encoder in the field, for example, the displacement is calculated by detecting the rotation angle of the main shaft and matching with the lead screw pitch and other parameters. The encoder can be used to detect the position of the sliding table, and can also be cooperated with the brake mechanism to link when the position of the sliding table is abnormal, so that the brake mechanism can be started in time.

[0032] The bearing for supporting the rotation of the main shaft is arranged between the main shaft and the shell, the end of the shell is provided with an end cover, the mounting cavity of the direct drive motor is formed between the end cover and the shell, and the oil seal for sealing the mounting cavity of the direct drive motor is arranged between the main shaft and the end cover.

[0033] The cooling groove corresponding to the direct drive motor is arranged on the shell, the cooling liquid inlet and outlet in communication with the cooling groove are arranged on the shell, the cooling groove and the cooling liquid inlet and outlet form a cooling circulation flow channel for cooling the direct drive motor, the cooling liquid inlet and outlet include a cooling liquid inlet and a cooling liquid outlet, the cooling liquid enters from the cooling liquid inlet, flows to the cooling groove, and then flows out from the cooling liquid outlet, so that the direct drive motor is prevented from overheating and normal work of the direct drive motor is ensured.

[0034] The rotating cylinder synchronous with the rotation of the main shaft is sleeved on the main shaft outside the shell, the lubricating oil mist spray-through groove in communication with the rotating cylinder, the main shaft and the lead screw nut is arranged in the radial direction, and the lubricating oil mist spray-through groove sprays lubricating oil to the lead screw, so as to lubricate the rotating pair of the lead screw and the lead screw nut.

[0035] The above embodiment is only a preferred embodiment of the utility model, and does not limit the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape, principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A lead screw direct drive motor structure, characterized by, The utility model relates to a linear motor drive system, which comprises a base, a screw rod assembly, a slide table assembly and a direct drive motor. The screw rod assembly comprises a screw rod (1) and a screw rod nut (2), wherein the screw rod (1) is fixed to the base, and the screw rod nut (2) is screwed to the screw rod (1). The slide table assembly is sleeved on the screw rod (1) and slides on a guide rail (3) parallel to the screw rod (1), and comprises a casing (4), a direct drive motor (5) and a main shaft (6).

2. The lead screw direct drive motor structure of claim 1, wherein, The direct drive motor (5) is arranged in the casing (4) and drives the main shaft (6) to rotate relative to the casing (4), and the end of the main shaft (6) is fixedly connected with the screw rod nut (2) and drives the screw rod nut (2) to rotate synchronously.

3. The structure of a lead screw direct drive motor according to claim 1, wherein The screw rod nut (2) drives the slide table assembly to move along the axial direction of the screw rod (1) when the screw rod nut (2) rotates.

4. The structure of a lead screw direct drive motor according to claim 1, wherein, The base is provided with a pair of fixed seats (7), and the two ends of the screw rod (1) are fixedly connected with the fixed seats (7).

5. The structure of a lead screw direct drive motor according to claim 1, wherein The guide rail (3) is laid on the base and distributed on the two sides of the screw rod (1).

6. The structure of a lead screw direct drive motor according to claim 1, wherein The end of the main shaft (6) extends out of the casing (4) and is provided with a mounting groove matched with the screw rod nut (2), and the outer edge of the screw rod nut (2) is fixedly connected with the end face of the main shaft (6) through an axial fastener (8).

7. The direct drive motor structure of claim 1, wherein, The end of the casing (4) opposite to the screw rod nut (2) is provided with a brake mechanism (9) for braking the main shaft (6).

8. The direct drive motor structure of claim 3, wherein, An encoder (10) for detecting the displacement of the slide table assembly is arranged in the casing (4). A bearing (11) for supporting the rotation of the main shaft (6) is arranged between the main shaft (6) and the casing (4), and an end cover (12) is arranged at the end of the casing (4). The end cover (12) and the casing (4) form a mounting cavity of the direct drive motor (5) therebetween, and an oil seal (13) for sealing the mounting cavity of the direct drive motor (5) is arranged between the main shaft (6) and the end cover (12). A cooling groove (14) is arranged at the position corresponding to the direct drive motor (5) of the casing (4), and a cooling liquid inlet and outlet (15) in communication with the cooling groove (14) is arranged on the casing (4). A rotary cylinder (16) rotating synchronously with the main shaft (6) is sleeved on the main shaft (6) outside the casing (4), and the rotary cylinder (16), the main shaft (6) and the screw rod nut (2) are arranged in radial direction and are provided with a lubricating oil mist spraying channel (17) in communication.

Images