Rear fixed shaft type linear stepping motor

Abstract

The utility model relates to the technical field of linear stepping motors, in particular to a rear fixed shaft type linear stepping motor which comprises a base, four fixing holes are formed in the base, a linear stepping motor mechanism is installed on the base and used for converting rotary motion into linear motion, and the linear stepping motor mechanism comprises a main body assembly and a fixed shaft assembly, comprising a motor body arranged on a base, a mounting rack is fixed on the motor body, and four mounting holes are formed in the mounting rack; the installation assembly comprises an inner hexagon bolt inserted between an installation hole in the installation frame and a fixing hole in the base, a nut is installed at the lower end of the inner hexagon bolt in a threaded mode, an expansion sleeve is installed on the inner hexagon bolt in a sleeving mode, and the expansion sleeve is located in the fixing hole; the gap between the inner hexagon bolt and the fixing hole is tightly filled with the expansion sleeve, looseness and vibration are reduced, the inner hexagon bolt is tightly fixed through expansion force, and looseness caused by long-term operation or vibration is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to linear stepping motor technical field, concretely is a rear fixed axle formula linear stepping motor. BACKGROUND

[0002] The rear fixed axle formula linear stepping motor is a kind of linear stepping motor of special design, its shaft is fixed in rear part, and motor main body moves along the shaft;This structure is suitable for the application scene needing high precision, high stability and long stroke;

[0003] According to the search, the publication number: CN214756024U discloses a rear fixed axle formula linear stepping motor, and the technical scheme in this technology discloses "a rear fixed axle formula linear stepping motor, including motor shell, stator assembly, rotor assembly and rear fixing device, rotor assembly includes screw rod, nut, rotor;The output end of the screw rod is connected with equipment, and the rear fixing device includes fixed part fixedly connected with the motor shell and movable part connected with the input end of the screw rod, and the inner surface of the fixed part has toothed track;The circumferential outer surface of the movable part has outer tooth structure engaged with the toothed track" and other technical schemes, have "rear fixing device is connected on the screw rod away from the equipment one end, to increase the installation space of equipment, installation is more convenient, secondly, the rear fixing device realizes the circumferential limiting of screw rod through the cooperation of toothed track and outer tooth structure, effectively guarantees the concentricity of screw rod" and other technical effects;

[0004] The existing rear fixed axle formula linear stepping motor is usually installed on equipment or workbench by the way of base or support cooperating with bolt;However, this installation mode is prone to bolt loosening under long-term operation or vibration environment;And there can be gap between bolt and mounting hole, leading to insufficient connection rigidity, and further affecting the stability and precision of motor operation. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of prior art, the utility model provides a rear fixed axle formula linear stepping motor, which tightly fills the gap between the internal hexagonal bolt and the fixed hole by the expansion sleeve, reduces loosening and vibration, and tightly fixes the internal hexagonal bolt by expansion force to prevent loosening caused by long-term operation or vibration.

[0006] To achieve the above object, the utility model is realized by the following technical scheme: a rear fixed axle formula linear stepping motor, including base, four fixed holes are formed on the base, and the base is installed with linear stepping motor mechanism and is used for converting rotary motion into linear motion, and the linear stepping motor mechanism includes:

[0007] Main body assembly, including motor body arranged on the base, and mounting rack is fixed on the motor body, and four mounting holes are formed in the mounting rack;

[0008] The mounting assembly comprises a hexagonal socket bolt inserted between the mounting hole on the mounting frame and the fixing hole on the base, a nut is threadedly installed at the lower end of the hexagonal socket bolt, an expansion sleeve is sleeved and installed on the hexagonal socket bolt, the expansion sleeve is located inside the fixing hole, an upper pressing sleeve and a lower pressing sleeve are respectively sleeved and installed at the upper and lower ends of the screw rod of the hexagonal socket bolt, and the upper pressing sleeve and the lower pressing sleeve are respectively located at the upper and lower ends inside the expansion sleeve.

[0009] Preferably, the mounting assembly further comprises a circular truncated cone-shaped opening opened in the inner wall of the upper and lower ends of the expansion sleeve, and the upper pressing sleeve and the lower pressing sleeve are respectively matched with the circular truncated cone-shaped openings in the upper and lower ends of the inner wall of the expansion sleeve.

[0010] Preferably, the mounting assembly further comprises notches which are circumferentially and equidistantly distributed on the upper and lower ends of the outer edge of the expansion sleeve, and the notches on the upper and lower ends are staggered with each other.

[0011] Preferably, the material of the expansion sleeve is polyamide structure.

[0012] Preferably, a hexagonal hole is opened at the lower end of the fixing hole, the nut is located inside the hexagonal hole, a circular hole is opened at the upper end of the linear stepping motor mechanism, and the head of the hexagonal socket bolt is located inside the circular hole.

[0013] Preferably, a guide rail is fixed on the top of the base, a sliding block is slidingly installed on the guide rail, and a guide piece is installed on the threaded rod of the motor body and is fixedly connected with the sliding block.

[0014] Beneficial effects

[0015] The utility model provides a kind of rear fixed shaft type linear stepping motor.Compared with prior art, it has the following beneficial effects:

[0016] 1, when mounting frame is installed on base, first, upper pressing sleeve and lower pressing sleeve are respectively not completely put into the circular truncated cone-shaped opening of the upper and lower ends of expansion sleeve, then expansion sleeve is completely put into fixing hole, nut is completely put into hexagonal hole, finally, hexagonal socket bolt is inserted and is threadedly installed with nut, when hexagonal socket bolt is tightened, the head of hexagonal socket bolt extrudes upper pressing sleeve, and simultaneously drives nut to extrude lower pressing sleeve, by extruding upper pressing sleeve and lower pressing sleeve to inside expansion sleeve to make it expand, the gap between hexagonal socket bolt and fixing hole is tightly filled, looseness and vibration are reduced, and by expansion force, hexagonal socket bolt is tightly fixed, to prevent looseness caused by long-term operation or vibration.

[0017] 2, the notches which are circumferentially and equidistantly distributed on the upper and lower ends of the outer edge of the expansion sleeve, and the notches on the upper and lower ends are staggered with each other, so that the expansion sleeve has contraction or rebound space when being extruded; the material of the expansion sleeve is polyamide structure, the expansion sleeve of polyamide material has light weight and good damping performance, and can effectively absorb vibration. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0019] Figure 2 It is a sectional view of linear stepping motor mechanism in the utility model;

[0020] Figure 3 It is the utility model Figure 2 Structure schematic view of partial A in the utility model;

[0021] Figure 4 It is the split view of mounting assembly in the utility model.

[0022] In the drawing: 1, base; 2, fixed hole; 3, linear stepping motor mechanism; 31, main body assembly; 311, motor body; 312, mounting bracket; 313, mounting hole; 32, mounting assembly; 321, inner hexagonal bolt; 322, nut; 323, expansion sleeve; 324, upper force sleeve; 325, lower force sleeve; 326, circular truncated cone opening; 327, notch; 4, hexagonal hole; 5, round hole; 6, guide rail; 7, sliding block; 8, guide piece. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] Please refer to Figure 1 - Figure 4 The utility model provides a kind of technical scheme: a rear fixed shaft type linear stepping motor, including base 1, four fixed holes 2 are set on base 1, linear stepping motor mechanism 3 is installed on base 1 and is used to convert rotary motion into linear motion, linear stepping motor mechanism 3 includes:

[0025] Main body assembly 31, including the motor body 311 being arranged on base 1, mounting bracket 312 is fixed on motor body 311, four mounting holes 313 are set in mounting bracket 312 inside;

[0026] The mounting assembly 32 comprises a hexagonal socket head cap screw 321 inserted between the mounting hole 313 on the mounting frame 312 and the fixing hole 2 on the base 1, a nut 322 is screwed at the lower end of the hexagonal socket head cap screw 321, an expansion sleeve 323 is sleeved and mounted on the hexagonal socket head cap screw 321, and the expansion sleeve 323 is located inside the fixing hole 2, an upper pressing sleeve 324 and a lower pressing sleeve 325 are respectively sleeved and mounted on the upper and lower ends of the screw rod of the hexagonal socket head cap screw 321, and the upper pressing sleeve 324 and the lower pressing sleeve 325 are respectively located at the upper and lower ends inside the expansion sleeve 323.

[0027] In this embodiment, when the mounting frame 312 is mounted on the base 1, first, the upper pressing sleeve 324 and the lower pressing sleeve 325 are respectively incompletely placed into the circular truncated cone-shaped openings 326 at the upper and lower ends of the expansion sleeve 323, then the expansion sleeve 323 is completely placed into the fixing hole 2, the nut 322 is completely placed into the hexagonal hole 4, and finally the hexagonal socket head cap screw 321 is inserted and screwed with the nut 322, during the tightening of the hexagonal socket head cap screw 321, the head of the hexagonal socket head cap screw 321 extrudes the upper pressing sleeve 324, and at the same time drives the nut 322 to extrude the lower pressing sleeve 325, by extruding the upper pressing sleeve 324 and the lower pressing sleeve 325 into the expansion sleeve 323 to make it expand, the gap between the hexagonal socket head cap screw 321 and the fixing hole 2 is tightly filled, the looseness and vibration are reduced, and the hexagonal socket head cap screw 321 is tightly fixed by the expansion force to prevent looseness caused by long-term operation or vibration.

[0028] Specifically, the mounting assembly 32 further comprises circular truncated cone-shaped openings 326 opened in the inner walls of the upper and lower ends of the expansion sleeve 323, and the upper pressing sleeve 324 and the lower pressing sleeve 325 are respectively matched with the circular truncated cone-shaped openings 326 in the inner walls of the upper and lower ends of the expansion sleeve 323.

[0029] In this embodiment, after the upper pressing sleeve 324 and the lower pressing sleeve 325 are inserted into the circular truncated cone-shaped openings 326 on the expansion sleeve 323, they can be extruded from the inside to the outside to expand.

[0030] Specifically, the mounting assembly 32 further comprises notches 327 opened in the upper and lower ends of the outer edge of the expansion sleeve 323, and the notches 327 in the upper and lower ends are interlaced with each other.

[0031] In this embodiment, the expansion sleeve 323 has a space for contraction or rebound when it is extruded.

[0032] Specifically, the material of the expansion sleeve 323 is a polyamide structure.

[0033] In this embodiment, the expansion sleeve 323 made of polyamide material has the advantages of light weight and good vibration reduction performance, and can effectively absorb vibration.

[0034] Specifically, the lower end of the fixing hole 2 is provided with a hexagonal hole 4, and the nut 322 is located inside the hexagonal hole 4, and the upper end of the linear stepping motor mechanism 3 is provided with a circular hole 5, and the head of the inner hexagonal bolt 321 is located inside the circular hole 5.

[0035] In the embodiment, when the mounting frame 312 is fixed with the base 1 through the mounting assembly 32, the head of the inner hexagonal bolt 321 is located inside the circular hole 5, the nut 322 is located inside the hexagonal hole 4, and the rotation of the nut 322 is limited; so that the mounting assembly 32 is located in the mounting frame 312 and the base 1, and is not exposed outside.

[0036] Specifically, the top of the base 1 is fixed with a guide rail 6, the guide rail 6 is slidably installed with a sliding block 7, and the threaded rod of the motor body 311 is installed with a guide piece 8 and is fixedly connected with the sliding block 7.

[0037] In the embodiment, when the threaded rod of the motor body 311 rotates, the sliding block 7 is driven to move along the guide rail 6 through the guide piece 8.

[0038] The working principle and use process of the utility model are as follows: first, when the mounting frame 312 is installed on the base 1, the upper and lower pressing sleeves 324 and 325 are respectively not completely put into the circular table-shaped openings 326 at the upper and lower ends of the expansion sleeve 323, then the expansion sleeve 323 is completely put into the fixing hole 2, the nut 322 is completely put into the hexagonal hole 4, and finally the inner hexagonal bolt 321 is inserted and screwed with the nut 322, when the inner hexagonal bolt 321 is tightened, the head of the inner hexagonal bolt 321 extrudes the upper pressing sleeve 324, and simultaneously drives the nut 322 to extrude the lower pressing sleeve 325, the upper and lower pressing sleeves 324 and 325 are extruded into the expansion sleeve 323 to expand, tightly fill the gap between the inner hexagonal bolt 321 and the fixing hole 2, reduce looseness and vibration, and tightly fix the inner hexagonal bolt 321 through the expansion force, prevent looseness caused by long-term operation or vibration.

[0039] It should be noted that, in this document, the terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article, or device.

[0040] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rear fixed shaft type linear stepping motor, comprising a base (1) with four fixing holes (2) formed therein, characterized in that: The base (1) is provided with a linear stepping motor mechanism (3) for converting rotary motion into linear motion, and the linear stepping motor mechanism (3) comprises: The main body assembly (31) comprises a motor body (311) arranged on the base (1), and a mounting frame (312) fixed to the motor body (311), and four mounting holes (313) are formed in the mounting frame (312); The mounting assembly (32) comprises a hexagonal socket head cap screw (321) inserted between the mounting hole (313) on the mounting frame (312) and the fixing hole (2) on the base (1), a nut (322) threadedly connected to the lower end of the hexagonal socket head cap screw (321), an expansion sleeve (323) sleeved on the hexagonal socket head cap screw (321), and the expansion sleeve (323) is located in the fixing hole (2), an upper forced sleeve (324) and a lower forced sleeve (325) are respectively sleeved on the upper and lower ends of the screw rod of the hexagonal socket head cap screw (321), and the upper forced sleeve (324) and the lower forced sleeve (325) are respectively located at the upper and lower ends of the expansion sleeve (323).

2. The rear fixed-shaft linear stepper motor according to claim 1, characterized in that: The mounting assembly (32) further comprises a circular truncated cone-shaped opening (326) formed in the inner wall of the upper and lower ends of the expansion sleeve (323), and the upper forced sleeve (324) and the lower forced sleeve (325) are respectively matched with the circular truncated cone-shaped openings (326) in the upper and lower inner walls of the expansion sleeve (323).

3. The linear stepper motor of claim 1, wherein: the rotor includes a plurality of permanent magnets; the stator includes a plurality of coils; and the rotor is disposed within the stator. The mounting assembly (32) further comprises a plurality of notches (327) circumferentially and equidistantly distributed on the upper and lower ends of the outer edge of the expansion sleeve (323), and the notches (327) on the upper and lower ends are staggered with each other.

4. The rear fixed-shaft linear stepper motor according to claim 1, characterized in that: The material of the expansion sleeve (323) is polyamide structure.

5. The rear fixed-shaft linear stepper motor according to claim 1, wherein: A hexagonal hole (4) is formed in the lower end of the fixing hole (2), and the nut (322) is located in the hexagonal hole (4), and a circular hole (5) is formed in the upper end of the linear stepping motor mechanism (3), and the head of the hexagonal socket head cap screw (321) is located in the circular hole (5).

6. The rear fixed shaft type linear stepping motor according to claim 1, wherein: The top of the base (1) is fixed with a guide rail (6), the guide rail (6) is slidably provided with a sliding block (7), and a guide piece (8) is arranged on the threaded rod of the motor body (311) and fixedly connected with the sliding block (7).

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