Linear motor with dust cover

Abstract

The utility model provides a linear motor with dust covers. The linear motor comprises a stator group, a rotor and a pair of dust covers. The dust covers are correspondingly arranged on the upper end face and the lower end face of the rotor respectively, each dust cover comprises a plane section and telescopic sections located at the two ends of the plane section, and the plane sections are fixedly arranged on the upper end face and the lower end face of the rotor. The two telescopic sections are fixedly arranged at the front and rear ends of the first stator and the second stator respectively. Through the synergistic effect of the plane section and the telescopic section of the dust cover, the communication area between the stator set and the external environment can be directly reduced, the dust cover can specifically shield the gap between the inner side of the stator set and the rotor, and the channel caliber of external impurities entering the stator set is reduced; most of dust, metal scraps, oil stains and other impurities in the environment can be effectively prevented from directly falling into the inner side of the stator set, the impurity invasion amount is remarkably reduced, and the motor fault hidden danger caused by accumulation of a large number of impurities is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to linear motor technical field, concretely relates to a linear motor with dust cover. BACKGROUND

[0002] Linear motor is a kind of motor that directly converts electric energy into linear motion, is composed of stator and mover, moves along linear path by the interaction between magnetic field and permanent magnet, such as the integrated heat dissipation structure's ironless linear motor disclosed in China CN119813652A, stator usually needs to reserve the opening or gap for the movement of mover, and the opening or gap is easy to become the channel for environmental impurities such as dust, metal debris, oil stains to invade. When impurities enter the air gap between stator and mover, it will cause the movement of mover to be blocked, destroy the movement stability, and even cause mechanical wear of permanent magnet or winding, shorten the service life of motor. UTILITY MODEL CONTENTS

[0003] In view of the deficiencies in the prior art, the utility model aims at providing a linear motor with dust cover to solve the problems mentioned in the background art.

[0004] The utility model realizes the following technical scheme:

[0005] A linear motor with dust cover, including stator group, mover and a pair of dust cover, the mover includes framework, the outer periphery of the framework is wound with winding coil, and the winding coil is movably arranged inside the stator group, the inner side wall of the first stator is arranged with first magnet group along the length direction, the inner side wall of the second stator is arranged with second magnet group along the length direction, the mover can move linearly along the length direction of first stator and second stator, a pair of dust cover is correspondingly arranged on the upper end surface and the lower end surface of the mover, the dust cover includes plane section and telescopic section at both ends of plane section, the plane section is fixedly arranged on the upper and lower end surfaces of the mover, and the telescopic section is fixedly arranged on the front and rear ends of the first stator and the second stator.

[0006] Further, the telescopic section is contracted by wave-shaped folding mode.

[0007] Further, the dust cover includes cover surface, and the density of the cover surface is less than or equal to 0.4 kg·m 2 .

[0008] Further, the cover surface is made of PVC, TPU or PTFE material.

[0009] Further, the outer surface of the cover surface is covered with nano dustproof coating.

[0010] Further, the telescopic section is provided with a plurality of upper creases and lower creases along the length direction thereof, each of the upper creases and the lower creases is parallel to the width direction of the planar section, and the upper creases and the lower creases are used for guiding the telescopic section to fold or stretch along a preset path, the dust cover further comprises fixed rods and sliding rods, the fixed rods are arranged at the lower creases on the two sides of the first telescopic section and the second telescopic section, and the sliding rods are arranged at the remaining lower creases, and the first stator and the second stator are correspondingly provided with guide grooves extending along the length direction thereof, and the two ends of the sliding rods are respectively embedded in the guide grooves.

[0011] Further, the cover surface is integrally formed with the planar section and the telescopic section.

[0012] Further, the first stator and the second stator are provided with baffle parts at the front ends and the rear ends thereof.

[0013] The utility model discloses the beneficial effect is: the utility model discloses a dust cover is set up on the upper end surface and the lower end surface of the mover, utilizes the planar section fixedly connected with the mover and synchronously moves with the mover, cooperates the telescopic section fixedly connected with the front end and rear end of the first stator and the second stator respectively, can form dynamic shielding between the mover and the stator group in the full stroke of the mover along the length direction of the stator group, although can not completely isolate impurities, but through the cooperation of the planar section and the telescopic section of the dust cover, can directly reduce the communication area of the stator group and external environment, the dust cover can form targeted shielding between the inside of the stator group and the mover, reduce the channel caliber of the impurities into the stator group, can effectively block most of the dust, metal scraps, oil stains and other impurities in the environment from directly falling into the inside of the stator group, significantly reduce the impurity invasion amount, avoid the motor failure hidden danger caused by the large amount of impurity accumulation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of the linear motor with the dust cover of the utility model.

[0015] Figure 2 It is Figure 1 It is the section view along A-A.

[0016] Figure 3 It is the internal structure schematic view of the linear motor with the dust cover of the utility model.

[0017] Figure 4 It is the local connection schematic view of the dust cover and the first stator.

[0018] Among them, the above drawing includes the following figure marks:

[0019] 1, stator group; 11, first stator; 111, first magnet group; 112, guide groove; 12, second stator; 121, second magnet group; 13, baffle part; 2, mover; 21, framework; 22, winding coil; 3, dust cover; 31, flat section; 32, telescopic section; 321, upper crease; 322, lower crease; 33, cover surface; 34, fixed rod; 35, sliding rod; 351, roller; 4, breathable film. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be noted that the description of these embodiments is used to help understand the present application and does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0021] Referring to Figures 1 to 4 Fig. 1, a linear motor with a dust cover includes a stator group 1, a mover 2 and a pair of dust covers 3. The mover 2 includes a framework 21, and the outer periphery of the framework 21 is wound with a winding coil 22, and the winding coil 22 is movably arranged inside the stator group 1. The stator group 1 includes a first stator 11 and a second stator 12, and the inner side wall of the first stator 11 is arranged with a first magnet group 111 along the length direction thereof, and the inner side wall of the second stator 12 is arranged with a second magnet group 121 along the length direction thereof, and the mover 2 can move linearly along the length direction of the first stator 11 and the second stator 12. A pair of the dust covers 3 are respectively arranged on the upper end surface and the lower end surface of the mover 2, and the dust cover 3 includes a flat section 31 and telescopic sections 32 located at both ends of the flat section 31, and the flat section 31 is fixedly arranged on the upper and lower end surfaces of the mover 2. The two telescopic sections 32 are respectively fixedly arranged on the front and rear ends of the first stator 11 and the second stator 12.

[0022] Among them, the first stator 11 and the second stator 12 are symmetrically arranged, the first magnet group 111 and the second magnet group 121 have equal magnetic pulling force and opposite direction on the mover 2, and can offset the single-side magnetic pulling force, so that the mover 2 always keeps on the preset movement path in the middle of the stator group 1, avoids deviation, reduces the wear rate of the winding coil 22, and prolongs the service life.

[0023] The material selection and arrangement mode of the first magnet group 111 and the second magnet group 121 belong to the prior art, the first magnet group 111 and the second magnet group 121 can be selected from permanent magnets, the first magnet group 111 and the second magnet group 121 are arranged alternately with N and S poles, and the adjacent poles have opposite polarity.

[0024] Compared with the telescopic mode of two or more flat plates superimposed, the flat plate is a rigid material, the telescopic section 32 is contracted through the wave-shaped folding mode, and a continuous arc-shaped corrugated chamber is formed on the surface instead of a plane superimposed surface. When the mover 2 drives the telescopic section 32 to move back and forth at high speed, the flat plate superimposed structure of the rigid material will forcibly push the airflow in the gap between the stator and the mover 2 like a “shovel” due to the lack of buffer space between adjacent flat plates, resulting in the generation of a local transient positive pressure of 20 Pa-30 Pa. The positive pressure will break the balance of the airflow in the gap, and instead, the dust, metal debris and other impurities in the external environment will be “pushed” into the inside of the stator group 1, especially the action gap of the first magnet group 111, the second magnet group 121 and the winding coil 22.

[0025] The wave-shaped folding structure of the utility model, when the mover 2 moves, the telescopic dust cover 3 is longitudinally folded, and the airflow is absorbed by the corrugation. The corrugation refers to the continuous undulating wrinkles formed on the surface of the dust cover 3 after longitudinal folding. When the mover 2 moves to one side, the telescopic section 32 of the dust cover 3 on the corresponding side will slowly unfold, that is, the wrinkles change from the folded state to loose, and the distance between the wave peaks and the wave troughs becomes larger. At this time, the surrounding airflow will fill in because the distance between the wrinkles becomes larger, and the airflow will not rush into the stator gap, but will enter the gap between the wrinkles along the wave trough of the corrugation, and will not form impact pressure. If it is a flat plate superimposed structure, the flat plate will push away the airflow like a “shovel” when it is unfolded, and the airflow will be squeezed into the stator gap, forming positive pressure and dust.

[0026] Based on the above principle, the telescopic section 32 of the utility model is contracted through the wave-shaped folding mode, which can further reduce the probability of dust, metal debris and other impurities entering the inside of the stator group 1.

[0027] The dust cover 3 comprises a cover surface 33, and the density of the cover surface 33 is less than or equal to 0.4 kg·m 2 By setting the density of the cover surface 33 to be lower than the above parameter, the weight of the dust cover 3 itself can be significantly reduced. For example, compared with a metal dust cover 3, such as an aluminum cover surface 33 with a density of about 2.74 kg·m 2 , the weight of the cover surface 33 of the design is only 1 / 6 or less, avoiding the increase of the movement load of the mover 2.

[0028] The cover surface 33 is made of PVC, TPU or PTFE material. Among them, PVC represents polyvinyl chloride, TPU represents thermoplastic polyurethane elastomer, and PTFE represents polytetrafluoroethylene, all of which are existing materials. By selecting the above-mentioned materials to make the cover surface 33, the design requirement of light weight of the cover surface 33 is met. The PVC film can form fixed folds through hot pressing process and is not easy to break when folded; TPU has high elasticity and can stretch repeatedly without fatigue damage; although PTFE film has slightly high rigidity, it still has certain flexibility after thinning and can be smoothly unfolded or folded along the preset fold. The three materials can resist the erosion of dust, oil stains and other common in industrial environment, and avoid aging failure in a short time.

[0029] The outer surface of the cover surface 33 is entirely covered with a nano dustproof coating. Through the nano dustproof coating, the dust adhesion probability is reduced. The material and construction steps of the nano dustproof coating belong to the existing technology. The nano dustproof coating, such as nano aluminum nitride dustproof coating.

[0030] The telescopic section 32 is provided with a plurality of upper folds 321 and lower folds 322 along the length direction thereof, each of the upper folds 321 and the lower folds 322 is parallel to the width direction of the plane section 31, and the upper folds 321 and the lower folds 322 are used to guide the telescopic section 32 to fold or stretch along the preset path. The dust cover 3 further comprises fixed rods 34 and sliding rods 35. The fixed rods 34 are arranged at the lower folds 322 on both sides of the first and second ends, and the sliding rods 35 are arranged at the remaining lower folds 322. Corresponding guide grooves 112 extending along the length direction are provided on the first stator 11 and the second stator 12. The two ends of the sliding rod 35 are respectively embedded in the guide grooves 112.

[0031] The cover surface 33, the fixed rods 34 and the sliding rods 35 are adhered by glue or other means, such as modified acrylate structure glue. The glue has good compatibility with the materials of the PVC, TPU and PTFE cover surface 33, and has no volatile harmful substances after adhesion. The two ends of the sliding rod 35 are provided with rollers 351, which are embedded in the guide grooves 112. The fixed rods 34 and the sliding rods 35 can be made of carbon fiber material to reduce the weight. When the telescopic section 32 is repeatedly folded, the concave fold vertex of the lower fold 322 is the weakest area where stress is most concentrated, which is easy to produce cracks due to fatigue. The sliding rod 35 and the fixed rod 34 are arranged along the lower fold 322, which can strengthen the structural strength of the area.

[0032] The cover surface 33 is integrally formed with the plane section 31 and the telescopic section 32. The plane section 31 and the telescopic section 32 are integrally formed by processes such as hot pressing of PVC or TPU film, and PTFE die forming, and the upper folds 321 and the lower folds 322 are also formed at the same time. This facilitates processing and eliminates the need for additional adhesion process steps at the connection of the split structure.

[0033] The first stator 11 and the second stator 12 are provided with baffle parts 13 at the front and rear ends. The baffle parts 13 are used to close the openings of the guide grooves 112, and the baffle parts 13 simultaneously close the front and rear end openings of the first stator 11 and the second stator 12, further reducing the probability of impurities such as dust and metal debris entering the inside of the stator set 1.

[0034] A linear motor with a dust cover 3 further comprises a gas-permeable film 4 connected to the front and rear ends of the first stator 11 and the second stator 12, such as a PTFE microporous gas-permeable film 4 in the prior art. The gas-permeable film 4 is used to balance the air pressure inside and outside the stator enclosed cavity of the dust cover 3, while blocking the intrusion of external dust and debris.

[0035] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features.

[0037] The above is only the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A linear motor with a dust cover, characterized by: The utility model provides a dustproof motor, including stator group (1), rotor (2) and a pair of dust cover (3), the rotor (2) includes framework (21), the outer periphery of framework (21) is wound with winding coil (22), and winding coil (22) is movably arranged in the inside of stator group (1), the stator group (1) includes first stator (11) and second stator (12), the inside wall of first stator (11) is spaced apart and parallelly arranged with first magnet group (111) along its length direction, and the inside wall of second stator (12) is spaced apart and parallelly arranged with second magnet group (121) along its length direction, and the rotor (2) can do linear motion along the length direction of first stator (11) and second stator (12). A pair of dust cover (3) is correspondingly arranged on the upper end face and the lower end face of the rotor (2), and the dust cover (3) includes a flat section (31) and a telescopic section (32) at both ends of the flat section (31), and the flat section (31) is fixedly arranged on the upper and lower end faces of the rotor (2). The telescopic sections (32) are fixedly arranged on the front and rear ends of the first stator (11) and the second stator (12).

2. A linear motor with a dust cover according to claim 1, characterized in that: The telescopic section (32) is contracted by a wave-shaped folding mode.

3. A linear motor with a dust cover according to claim 1, characterized in that: The dust cover (3) comprises a cover surface (33) having a density of less than or equal to 0.4 kg·m 2 .

4. A linear motor with a dust cover according to claim 3, characterized in that: The cover surface (33) is made of PVC, TPU or PTFE material.

5. A linear motor with a dust cover according to claim 3, characterized in that: The outer surface of the cover surface (33) is entirely covered with a nano dustproof coating.

6. A linear motor with a dust cover according to claim 3, characterized in that: The telescopic section (32) is provided with a plurality of upper folds (321) and lower folds (322) along the length direction, the upper folds (321) and the lower folds (322) are parallel to the width direction of the flat section (31), and the upper folds (321) and the lower folds (322) are used to guide the telescopic section (32) to fold or stretch along a preset path. The dust cover (3) further includes a fixed rod (34) and a sliding rod (35), the fixed rod (34) is arranged on the lower folds (322) at the two ends, the sliding rod (35) is arranged on the remaining lower folds (322), the first stator (11) and the second stator (12) are provided with guide grooves (112) extending along the length direction, and the two ends of the sliding rod (35) are embedded in the guide grooves (112).

7. A linear motor with a dust cover according to claim 3, characterized in that: The cover surface (33) is integrally formed with the flat section (31) and the telescopic section (32).

8. A linear motor with a dust cover according to claim 1, characterized in that: The first stator (11) and the second stator (12) are provided with baffle parts (13) at the front and rear ends.

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