Large-stroke linear motor structure

Abstract

The utility model relates to a large-stroke linear motor structure, and relates to the field of lead screw transmission equipment, the large-stroke linear motor structure comprises a motor assembly, a lead screw assembly and a positioning assembly, the lead screw assembly comprises a hollow shaft and a spline lead screw, the hollow shaft is rotatably connected in the motor assembly, the motor assembly is used for providing rotation power for the hollow shaft, and the spline lead screw is rotatably connected in the hollow shaft. An internal thread is arranged on the inner wall of the hollow shaft, an external thread is arranged at one end of the spline lead screw, the internal thread is in threaded connection with the external thread, and the end, away from the external thread, of the spline lead screw is in key connection with the positioning assembly; the hollow shaft has the beneficial effects that the internal thread is arranged on the inner wall of the hollow shaft and is in threaded connection with the external thread at the end of the spline lead screw, so that the sliding stroke of the spline lead screw can be increased under the condition that the overall occupied space is not increased, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The present application relates to the field of screw transmission equipment, and in particular to a long-stroke linear motor structure. Background Art

[0002] Linear motor is a commonly used mechanical transmission device, which consists of a spline screw, a guide sleeve, and a motor component. Its working principle is to drive the spline to move back and forth by rotating the screw, thereby achieving precise position control of the mechanical system.

[0003] The related prior art discloses a linear screw stepper motor, including a motor body and a screw, the motor body includes a front cover, a rear cover, a stator, a rotor, a first bearing, a second bearing and a rotor shaft, one end of the stator is fixedly connected to the front cover, the other end of the stator is fixedly connected to the rear cover, the rotor is located inside the stator, the first bearing is fixed in the front cover, the second bearing is fixed in the rear cover, the motor body also includes a rotating sleeve, the rotating sleeve is coaxially sleeved on the rotor shaft and the two are fixedly connected, the rotor is assembled on the rotating sleeve, one end of the rotating sleeve is inserted in the first bearing, the other end of the rotating sleeve is inserted in the second bearing and the end passes through the rear cover, the end of the rotating sleeve extending out of the rear cover is provided with a through hole along the radial direction of the rotating sleeve, and one end of the screw is provided with a fixing hole along the radial direction of the screw. When in use, when one of the motor body or the screw has a problem and is damaged, it is only necessary to unscrew the fastening bolts to replace the motor body or the screw, and then fasten the screw and the motor body by the fastening bolts to use it normally, without having to replace all the motor body and the screw, saving costs.

[0004] With respect to the above-mentioned related technologies, the linear motor manufactured by this method has a shorter screw stroke, so when a larger stroke is required, the length of the rotating sleeve has to be lengthened, but sometimes the installation space is limited and a longer installation size cannot be provided. Utility Model Content

[0005] In order to provide a larger motor stroke while saving space, the present application provides a long-stroke linear motor structure.

[0006] The present application provides a long-stroke linear motor structure that adopts the following technical solution:

[0007] A long-stroke linear motor structure includes a motor assembly, a screw assembly and a positioning assembly, the screw assembly includes a hollow shaft and a spline screw, the hollow shaft is rotatably connected to the motor assembly, the motor assembly is used to provide rotational power for the hollow shaft, the inner wall of the hollow shaft is provided with an internal thread, one end of the spline screw is provided with an external thread, the internal thread and the external thread are threadedly connected to each other, and the end of the spline screw away from the external thread is keyed to the positioning assembly.

[0008] By adopting the above technical solution, by setting an internal thread on the inner wall of the hollow shaft and threading it with the external thread on the end of the spline screw, the sliding stroke of the spline screw can be increased without increasing the overall occupied space, which is convenient and quick.

[0009] Optionally, the outer peripheral wall of the hollow shaft is rotatably connected to a bearing, and the bearing is connected to the motor assembly.

[0010] By adopting the above technical solution, the setting of the bearing can improve the rotation smoothness between the hollow shaft and the motor assembly, reduce the phenomenon of the hollow shaft and the motor assembly being stuck together during use, and improve the rotation stability of the hollow shaft.

[0011] Optionally, the motor assembly includes a first end cover, a second end cover, a stator group and a rotor group, the first end cover is installed on one side of the stator group, the second end cover is connected to a side of the stator group away from the first end cover, the rotor group is fixedly connected to the hollow shaft, and the stator group is used to electromagnetically drive the rotor group to rotate.

[0012] By adopting the above technical solution, the setting of the first end cover and the second end cover can protect the stator group and reduce the occurrence of collision damage to the stator group during use. When the stator group electromagnetically drives the rotor group, the hollow shaft of the rotor group rotates together, thereby realizing the driving of the hollow shaft.

[0013] Optionally, a sealing gasket is provided between the first end cover and the stator assembly, and between the second end cover and the stator assembly.

[0014] By adopting the above technical solution, the setting of the sealing gasket can improve the sealing between the first end cover and the stator group and between the second end cover and the stator group, reduce the occurrence of external dust and moisture entering the stator group, improve the use stability of the linear motor, and help to increase the service life of the linear motor.

[0015] Optionally, the positioning assembly includes a sleeve, the sleeve is inserted into the first end cover, the spline screw is inserted in the sleeve, and a gap is reserved between the spline screw and the sleeve.

[0016] By adopting the above technical solution, the setting of the sleeve can realize the protection of the spline screw while realizing the guidance of the spline screw, thereby reducing the occurrence of the spline screw being damaged by external collisions.

[0017] Optionally, a connection card is disposed near the sleeve at the first end cover, and a plurality of groups of the connection cards are disposed along the peripheral wall of the sleeve. A fixing nut is also threadedly connected to the connection card.

[0018] By adopting the above technical solution, the spacing between the connecting cards can be changed by rotating the fixing thread, so as to achieve the locking and loosening of the sleeve, that is, tightening the fixing nut can achieve the fixed connection between the sleeve and the first end cover, and loosening the fixing nut can achieve the disassembly of the sleeve, which is convenient and quick.

[0019] Optionally, the positioning assembly further includes a limit plate, wherein the limit plate is connected to the inner wall of the sleeve, and the spline screw is keyed to the limit plate.

[0020] By adopting the above technical solution, the setting of the limit plate can achieve the guide limit for the spline screw, reduce the occurrence of bending and deviation of the spline screw, and the setting of the limit plate can also improve the structural strength of the sleeve.

[0021] Optionally, the positioning assembly further includes a fixing bolt, the fixing sleeve is penetrated by a fixing hole, the fixing bolt is threadedly connected in the fixing hole, and the limiting plate can send elastic deformation.

[0022] By adopting the above technical solution, the fixing bolt is threadedly connected to the fixing hole so that the fixing bolt squeezes the limiting plate. When the limiting plate undergoes elastic deformation, the spline screw can be fixed and locked, which is convenient and quick.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. By arranging an internal thread on the inner wall of the hollow shaft and threadingly connecting the external threads at the end of the spline screw rod, the sliding stroke of the spline screw rod can be increased without increasing the overall occupied space, which is convenient and quick.

[0025] 2. The setting of the first end cover and the second end cover can protect the stator group and reduce the occurrence of collision damage to the stator group during use. When the stator group electromagnetically drives the rotor group, the hollow shaft of the rotor group rotates together, thereby realizing the driving of the hollow shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the long-stroke linear motor structure of an embodiment of the present application.

[0027] Figure 2 It is a schematic cross-sectional structure diagram of the long-stroke linear motor structure of an embodiment of the present application.

[0028] Explanation of the accompanying drawings: 1. Motor assembly; 11. First end cover; 12. Second end cover; 13. Stator group; 14. Rotor group; 2. Screw assembly; 21. Hollow shaft; 22. Spline screw; 3. Positioning assembly; 31. Sleeve; 32. Limit plate; 33. Fixing bolt; 4. Internal thread; 5. External thread; 6. Bearing; 7. Sealing gasket; 8. Connecting card; 9. Fixing nut; 10. Fixing hole. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-2 This application is described in further detail.

[0030] The present application embodiment discloses a long-stroke linear motor structure. Figure 1 and Figure 2 The long-stroke linear motor structure includes a motor assembly 1, a screw assembly 2 and a positioning assembly 3. The motor assembly 1 includes a first end cover 11, a second end cover 12, a stator group 13 and a rotor group 14. The first end cover 11 and the second end cover 12 are respectively fixedly installed on both sides of the stator group 13. A sealing gasket 7 is arranged between the first end cover 11 and the stator group 13 and between the second end cover 12 and the stator group 13. The material of the sealing gasket 7 in this embodiment can be rubber. The stator group 13 is used to drive the rotor group 14 to rotate by electromagnetic.

[0031] Reference Figure 1 and Figure 2 The screw assembly 2 includes a hollow shaft 21 and a spline screw 22. The hollow shaft 21 is connected to the rotor group 14 and keeps synchronous rotation with the rotor group 14. In this embodiment, the rotor group 14 is connected to the hollow shaft 21 by glue coating and baking. The outer peripheries of both ends of the hollow shaft 21 are rotatably connected with bearings 6. The bearings 6 at both ends are respectively installed on the first end cover 11 and the second end cover 12, so as to realize the rotation connection of the hollow shaft 21 in the stator group 13.

[0032] Reference Figure 1 and Figure 2 The positioning assembly 3 includes a sleeve 31, a limit plate 32 and a fixing bolt 33. One end of the sleeve 31 is inserted into the first end cover 11, and the first end cover 11 is integrally formed with a connecting card 8 near the connection of the sleeve 31. The connecting card 8 is provided with multiple groups and is evenly arranged along the peripheral wall of the sleeve 31. The side of the connecting card 8 facing away from the sleeve 31 is threadedly connected with a fixing nut 9; the spline screw 22 is inserted into the sleeve 31, and a gap is reserved between the spline screw 22 and the sleeve 31. The limit plate 32 is bonded to the inner wall of the sleeve 31 and is keyed to the spline screw 22. The material of the limit plate 32 of this embodiment can be rubber. A fixing hole 10 is opened at the fixing sleeve 31 near the limiting plate 32. The fixing bolt 33 is threadedly connected to the fixing hole 10. The fixing bolt 33 can squeeze the limiting plate 32 to make the limiting plate 32 elastically deform.

[0033] The implementation principle of a long-stroke linear motor structure in an embodiment of the present application is: when in use, when the stator group 13 receives an electromagnetic pulse, the rotor group 14 is driven to rotate to a corresponding angle according to the number of electromagnetic pulses received, and the spline screw 22 is driven to achieve reciprocating operation under the threaded connection between the internal thread 4 and the external thread 5. The spline screw 22 of this embodiment has a large stroke and is convenient and fast.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A long-stroke linear motor structure, characterized in that: The invention comprises a motor assembly (1), a screw assembly (2) and a positioning assembly (3), wherein the screw assembly (2) comprises a hollow shaft (21) and a spline screw (22), wherein the hollow shaft (21) is rotatably connected to the motor assembly (1), and the motor assembly (1) is used to provide rotational power for the hollow shaft (21), wherein the inner wall of the hollow shaft (21) is provided with an internal thread (4), and one end of the spline screw (22) is provided with an external thread (5), wherein the internal thread (4) and the external thread (5) are threadedly connected to each other, and the end of the spline screw (22) away from the external thread (5) is key-connected to the positioning assembly (3).

2. The long-stroke linear motor structure according to claim 1, characterized in that: The outer peripheral wall of the hollow shaft (21) is rotatably connected to a bearing (6), and the bearing (6) is connected to the motor assembly (1).

3. The long-stroke linear motor structure according to claim 1, characterized in that: The motor assembly (1) comprises a first end cover (11), a second end cover (12), a stator group (13) and a rotor group (14); the first end cover (11) is mounted on one side of the stator group (13); the second end cover (12) is connected to a side of the stator group (13) away from the first end cover (11); the rotor group (14) is fixedly connected to the hollow shaft (21); and the stator group (13) is used to electromagnetically drive the rotor group (14) to rotate.

4. The long-stroke linear motor structure according to claim 3, characterized in that: A sealing gasket (7) is provided between the first end cover (11) and the stator assembly (13), and between the second end cover (12) and the stator assembly (13).

5. The long-stroke linear motor structure according to claim 3, characterized in that: The positioning assembly (3) comprises a sleeve (31), the sleeve (31) is inserted into the first end cover (11), the spline screw (22) is inserted into the sleeve (31), and a gap is reserved between the spline screw (22) and the sleeve (31).

6. The long-stroke linear motor structure according to claim 5, characterized in that: The first end cover (11) is provided with a connection card (8) near the sleeve (31), and a plurality of groups of the connection cards (8) are provided along the peripheral wall of the sleeve (31). A fixing nut (9) is also threadedly connected to the connection card (8).

7. The long-stroke linear motor structure according to claim 5, characterized in that: The positioning assembly (3) further comprises a limit plate (32), the limit plate (32) being connected to the inner wall of the sleeve (31), and the spline screw (22) being key-connected to the limit plate (32).

8. The long-stroke linear motor structure according to claim 7, characterized in that: The positioning assembly (3) further comprises a fixing bolt (33); a fixing hole (10) is provided through the sleeve (31); the fixing bolt (33) is threadedly connected in the fixing hole (10); and the limiting plate (32) can send elastic deformation.

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