A linear motor for use in humid environments

Abstract

The present invention discloses a linear motor for use in a humid environment, wherein the motor housing comprises a housing front cover and a rear cover, wherein the housing front cover comprises a front cover plastic part and a front cover metal part which are injection molded into an integral structure, and the housing rear cover comprises a rear cover plastic part and a rear cover metal part which are injection molded into an integral structure; the housing front cover and the rear cover are spliced ​​together, and the splicing position of the housing front cover and the rear cover is welded and sealed; the housing accommodating cavity of the motor housing is embedded with a stator assembly and a rotor assembly; the stator assembly comprises a winding shaft, a middle plate, and a wiring PIN needle which are injection molded into an integral structure, and the winding groove of the winding shaft is wound with a coil winding; the rotor assembly comprises a rotor nut, a magnet, and rotor front and rear end plastic parts which are injection molded into an integral structure, and the driving push rod comprises a driving part, an optical axis part, and a screw part, wherein the screw part is screwed into the internal threaded hole of the rotor nut, and the optical axis part is equipped with a stop pin which matches the stop groove of the front cover plastic part. The present invention has the advantages of novel structural design, good moisture-proof performance, and convenient assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of linear motors, and in particular to a linear motor used in a humid environment. Background Art

[0002] With the continuous improvement of automation technology and intelligence level, more and more automatic and intelligent products are entering people's daily lives; among them, for many automatic and intelligent products, their execution structure is driven by linear motors.

[0003] It should be pointed out that the existing linear motors have particularly poor moisture resistance and are difficult to be used in humid environments with high humidity.

[0004] In addition, the existing linear motors have the disadvantage of being inconvenient to assemble and it is difficult to realize automated assembly operations. Summary of the invention

[0005] The purpose of the present invention is to provide a linear motor for use in a humid environment in view of the deficiencies in the prior art. The linear motor for use in a humid environment has a novel structural design, good moisture-proof performance and is easy to assemble.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions.

[0007] A linear motor for use in a humid environment comprises a motor housing, the motor housing comprises a housing front cover and a housing rear cover located at the rear end side of the housing front cover, the housing front cover comprises a front cover plastic part and a front cover metal part, the front cover plastic part and the front cover metal part are injection molded into an integral structure; the housing rear cover comprises a rear cover plastic part and a rear cover metal part, the rear cover plastic part and the rear cover metal part are injection molded into an integral structure; the housing front cover and the housing rear cover are spliced, and the splicing position of the housing front cover and the housing rear cover is welded and sealed;

[0008] A housing accommodating cavity is formed inside the motor housing between the housing front cover and the housing rear cover, and a stator assembly and a rotor assembly are embedded in the housing accommodating cavity; the stator assembly includes a winding shaft in a hollow shape, the winding shaft is a hard plastic part, a central electrode plate is installed in the middle of the winding shaft, and the central electrode plate and the winding shaft are injection molded into an integral structure; the winding shaft is provided with a winding groove surrounding the outer periphery of the central hole of the winding shaft, and a coil winding is wound in the winding groove; the winding shaft is also provided with a wiring PIN pin electrically connected to the coil winding, and the wiring PIN pin and the winding shaft are injection molded into an integral structure;

[0009] The rotor assembly is located in the center hole of the winding shaft, and the rotor assembly includes a rotor nut, a magnet in the shape of a ring which is sleeved on the outer periphery of the rotor nut, a rotor front end plastic part is installed at the front end of the rotor nut, and a rotor rear end plastic part is installed at the rear end of the rotor nut. The rotor nut, the magnet, the rotor front end plastic part, and the rotor rear end plastic part are injection molded into an integrated structure; the rotor assembly also includes a driving push rod, and the driving push rod includes a driving part, an optical axis part, and a screw part which are connected in sequence from front to back. The driving part, the optical axis part, and the screw part are an integrated structure. The screw portion of the rod is screwed into the internal threaded hole of the rotor nut; the optical axis portion of the driving push rod is equipped with a stop pin extending radially along the optical axis portion, and the front cover plastic part is provided with a stop groove extending along the axial direction of the driving push rod corresponding to the stop pin, and the stop pin extends into the stop groove of the front cover plastic part; the front cover plastic part is provided with a front cover through hole that opens forward and is connected to the housing accommodating cavity, the optical axis portion of the driving push rod is inserted into the front cover through hole and the outer circumferential surface of the optical axis portion contacts the interior of the front cover through hole, and the driving portion of the driving push rod extends to the front end side of the front cover plastic part.

[0010] The front cover plastic part is provided with a front cover PCB fixing part, the rear cover plastic part is provided with a rear cover PCB fixing part, a PIN pin through hole is provided between the front cover PCB fixing part and the rear cover PCB fixing part, and the wiring PIN pin passes through the PIN pin through hole from inside to outside and extends to the outer end side of the motor housing;

[0011] The linear motor used in a humid environment also includes a wiring PCB board, which is installed between the front cover PCB fixing part and the rear cover PCB fixing part, and the wiring PCB board covers the PIN pin through hole, and the wiring PIN pin is welded to the wiring PCB board.

[0012] Among them, the front cover PCB fixing part is provided with a front cover positioning column, the rear cover PCB fixing part is provided with a rear cover positioning column, and the wiring PCB board is respectively provided with positioning holes corresponding to the front cover positioning column and the rear cover positioning column, and the front cover positioning column and the rear cover positioning column are respectively inserted into the corresponding positioning holes of the wiring PCB board.

[0013] Wherein, a front end ball bearing is installed between the front end plastic part of the rotor and the front cover plastic part, and a rear end ball bearing is installed between the rear end plastic part of the rotor and the rear cover plastic part.

[0014] The optical axis portion of the driving push rod is provided with a latch mounting hole which completely penetrates radially, the anti-rotation latch is inserted into the latch mounting hole of the optical axis portion, and the anti-rotation latch is interference fit with the latch mounting hole.

[0015] The beneficial effects of the present invention are as follows: the linear motor for use in a humid environment described in the present invention comprises a motor housing, the motor housing comprises a housing front cover, and a housing rear cover located at the rear end side of the housing front cover, the housing front cover comprises a front cover plastic part and a front cover metal part, and the front cover plastic part and the front cover metal part are injection molded into an integral structure; the housing rear cover comprises a rear cover plastic part and a rear cover metal part, and the rear cover plastic part and the rear cover metal part are injection molded into an integral structure; the housing front cover and the housing rear cover are spliced, and the splicing position of the housing front cover and the housing rear cover is welded and sealed; the motor housing A shell accommodating cavity is formed inside the shell between the shell front cover and the shell rear cover, and a stator assembly and a rotor assembly are embedded in the shell accommodating cavity; the stator assembly includes a winding shaft in a hollow shape, the winding shaft is a hard plastic part, a center plate is installed in the middle of the winding shaft, and the center plate and the winding shaft are injection molded into an integral structure; the winding shaft is provided with a winding groove surrounding the periphery of the central hole of the winding shaft, and a coil winding is wound in the winding groove; the winding shaft is also provided with a wiring PIN pin electrically connected to the coil winding, and the wiring PIN pin and the winding shaft are injection molded into an integral structure; The subassembly is located in the center hole of the winding shaft, the rotor assembly includes a rotor nut, a magnet in the shape of a ring which is mounted on the outer periphery of the rotor nut, the front end of the rotor nut is equipped with a rotor front end plastic part, the rear end of the rotor nut is equipped with a rotor rear end plastic part, the rotor nut, the magnet, the rotor front end plastic part, and the rotor rear end plastic part are injection molded into an integrated structure; the rotor assembly also includes a driving push rod, the driving push rod includes a driving part, an optical axis part, and a screw part which are connected in sequence from front to back, the driving part, the optical axis part, and the screw part are an integrated structure, and the driving push rod The screw part is screwed into the internal threaded hole of the rotor nut; the optical axis part of the driving push rod is equipped with a stop pin extending radially along the optical axis part, and the front cover plastic part is provided with a stop groove extending along the axial direction of the driving push rod corresponding to the stop pin, and the stop pin extends into the stop groove of the front cover plastic part; the front cover plastic part is provided with a front cover through hole that opens forward and is connected to the housing accommodating cavity, the optical axis part of the driving push rod is inserted into the front cover through hole, and the outer circumferential surface of the optical axis part contacts the inside of the front cover through hole, and the driving part of the driving push rod extends to the front end side of the front cover plastic part. Through the above structural design, the present invention has the advantages of novel structural design, good moisture-proof performance, and convenient assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with the aid of the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of another viewing angle of the present invention.

[0019] Figure 3 It is a schematic diagram of the decomposition of the present invention.

[0020] Figure 4 It is a cross-sectional schematic diagram of the present invention.

[0021] Figure 5 It is a schematic diagram of the local structure of the present invention.

[0022] exist Figures 1 to 5 Included are:

[0023] 1——Motor housing 11——Housing cavity

[0024] 2——Housing front cover 21——Front cover plastic part

[0025] 211——Stop groove 212——Through hole of front cover

[0026] 213——Front cover PCB fixing part 2131——Front cover positioning column

[0027] 22——Front cover metal parts 3——Rear cover of the shell

[0028] 31——Back cover plastic part 311——Back cover PCB fixing part

[0029] 3111——Rear cover positioning column 32——Rear cover metal parts

[0030] 4——Stator assembly 41——Winding shaft

[0031] 411——winding groove 42——middle plate

[0032] 43——Connection PIN 5——Rotor assembly

[0033] 51——Rotor nut 52——Magnet

[0034] 53——Plastic part at the front end of the rotor 54——Plastic part at the rear end of the rotor

[0035] 55——driving push rod 551——driving part

[0036] 552——Optical axis 5521——Pin mounting hole

[0037] 553——screw part 56——stop bolt

[0038] 571 - front ball bearing 572 - rear ball bearing

[0039] 6——PIN through hole 7——Connection PCB board

[0040] 71——Positioning hole. DETAILED DESCRIPTION

[0041] The present invention is described below in conjunction with specific implementation methods.

[0042] like Figures 1 to 4 As shown, a linear motor for use in a humid environment includes a motor housing 1, the motor housing 1 includes a housing front cover 2, and a housing back cover 3 located at the rear end side of the housing front cover 2, the housing front cover 2 includes a front cover plastic part 21 and a front cover metal part 22, the front cover plastic part 21 and the front cover metal part 22 are injection molded into an integral structure; the housing back cover 3 includes a back cover plastic part 31 and a back cover metal part 32, the back cover plastic part 31 and the back cover metal part 32 are injection molded into an integral structure; the housing front cover 2 and the housing back cover 3 are spliced ​​and the splicing position of the housing front cover 2 and the housing back cover 3 is welded and sealed.

[0043] Further, such as Figure 3 and Figure 4 As shown, a housing accommodating cavity 11 is formed inside the motor housing 1 between the housing front cover 2 and the housing rear cover 3, and a stator assembly 4 and a rotor assembly 5 are embedded in the housing accommodating cavity 11; the stator assembly 4 includes a winding shaft 41 in a hollow shape, the winding shaft 41 is a hard plastic part, a center plate 42 is installed in the middle of the winding shaft 41, and the center plate 42 and the winding shaft 41 are injection molded into an integral structure; the winding shaft 41 is provided with a winding groove 411 surrounding the periphery of the central hole of the winding shaft 41, and a coil winding is wound in the winding groove 411; the winding shaft 41 is also provided with a wiring PIN pin 43 electrically connected to the coil winding, and the wiring PIN pin 43 and the winding shaft 41 are injection molded into an integral structure.

[0044] Furthermore, Figure 3 and Figure 4As shown, the rotor assembly 5 is located in the center hole of the winding shaft 41, and the rotor assembly 5 includes a rotor nut 51, a magnet 52 which is sleeved on the outer periphery of the rotor nut 51 and is in the shape of a ring, the front end of the rotor nut 51 is equipped with a rotor front end plastic part 53, and the rear end of the rotor nut 51 is equipped with a rotor rear end plastic part 54. The rotor nut 51, the magnet 52, the rotor front end plastic part 53, and the rotor rear end plastic part are injection molded into an integral structure; the rotor assembly 5 also includes a driving push rod 55, and the driving push rod 55 includes a driving part 551, an optical axis part 552, and a screw part 553 which are connected in sequence from front to back. The driving part 551, the optical axis part 552, and the screw part 553 are an integral structure, and the screw of the driving push rod 55 The portion 553 is screwed into the internal threaded hole of the rotor nut 51; the optical axis portion 552 of the driving push rod 55 is equipped with a stop pin 56 extending radially along the optical axis portion 552, and the front cover plastic part 21 is provided with a stop groove 211 extending along the axial direction of the driving push rod 55 corresponding to the stop pin 56, and the stop pin 56 extends into the stop groove 211 of the front cover plastic part 21; the front cover plastic part 21 is provided with a front cover through hole 212 which is open forward and connected to the shell accommodating cavity 11, the optical axis portion 552 of the driving push rod 55 is inserted into the front cover through hole 212 and the outer circumferential surface of the optical axis portion 552 is in contact with the interior of the front cover through hole 212, and the driving portion 551 of the driving push rod 55 extends to the front end side of the front cover plastic part 21.

[0045] It should be explained that, with respect to the anti-rotation pin 56 of the present invention, it can be installed and fastened to the optical axis portion 552 of the driving push rod 55 in the following manner. Specifically, the optical axis portion 552 of the driving push rod 55 is provided with a pin mounting hole 5521 which completely penetrates radially, and the anti-rotation pin 56 is inserted into the pin mounting hole 5521 of the optical axis portion 552, and the anti-rotation pin 56 and the pin mounting hole 5521 have an interference fit.

[0046] For the linear motor of the present invention, since the front cover 2, the rear cover 3 and the stator assembly 4 are respectively injection-molded integral parts, and the rotor nut 51, the magnet 52, the rotor front end plastic part 53 and the rotor rear end plastic part 54 of the rotor assembly 5 are also injection-molded into an integral structure, during the assembly of the linear motor, the rotor assembly 5 is first placed into the center hole of the winding shaft 41 of the stator assembly 4, and then the front cover 2 and the rear cover 3 of the housing are docked and spliced, and it is ensured that the optical axis portion 552 of the driving push rod 55 of the rotor assembly 5 passes through the front cover through hole 212 of the front cover plastic part 21; for the above-mentioned injection-molded integral structure design, the present invention can achieve the purpose of fast and convenient assembly, and is easy to realize automated assembly operations.

[0047] It should be pointed out that, since the front cover 2 of the shell and the rear cover 3 of the shell are spliced ​​and the splicing position of the front cover 2 and the rear cover 3 of the shell is welded and sealed, and the outer circumferential surface of the optical axis portion 552 of the driving push rod 55 is in contact with the inner wall of the front cover through hole 212, the above-mentioned structural design can ensure that the shell accommodating cavity 11 is a relatively sealed space, that is, the rotor assembly 5 and the stator assembly 4 are installed in a relatively sealed space. This structural design can make the present invention effectively applicable to long-term humid environments.

[0048] In the process of realizing telescopic drive of the driving push rod 55 of the present invention, the wire winding after power-on generates a magnetic field force, the stator assembly 4 drives the magnet 52 to rotate, and the rotating magnet 52 drives the rotor nut 51 to rotate; because the anti-rotation pin 56 extends into the anti-rotation groove 211 of the front cover plastic part 21, in the process of rotation of the rotor nut 51, the rotor nut 51 drives the driving push rod 55 to move straight forward and backward, thereby realizing the telescopic action.

[0049] In summary, it can be seen that through the above structural design, the present invention has the advantages of novel structural design, good moisture-proof performance and convenient assembly.

[0050] As a preferred embodiment, Figure 4 As shown, a front ball bearing 571 is installed between the front plastic part 53 of the rotor and the front cover plastic part 21 , and a rear ball bearing 572 is installed between the rear plastic part 54 of the rotor and the rear cover plastic part 31 .

[0051] By adding the front end ball bearing 571 and the rear end ball bearing 572 , the present invention can ensure that the rotor assembly 5 rotates more smoothly in the housing accommodating cavity 11 and effectively reduce noise.

[0052] As a preferred embodiment, Figures 1 to 5 As shown, the front cover plastic part 21 is provided with a front cover PCB fixing part 213, the rear cover plastic part 31 is provided with a rear cover PCB fixing part 311, a PIN pin through hole 6 is opened between the front cover PCB fixing part 213 and the rear cover PCB fixing part 311, and the wiring PIN pin 43 passes through the PIN pin through hole 6 from the inside to the outside and extends to the outer end side of the motor housing 1;

[0053] The linear motor for use in a humid environment also includes a wiring PCB board 7, which is installed between the front cover PCB fixing portion 213 and the rear cover PCB fixing portion 311, and the wiring PCB board 7 covers the PIN needle through hole 6, and the wiring PIN needle 43 is welded to the wiring PCB board 7.

[0054] It should be explained that, since the wiring PCB board 7 covers the PIN pin through hole 6 and the wiring PIN pin 43 is welded to the wiring PCB board 7, this structural design can ensure that the PIN pin through hole 6 between the front cover plastic part 21 and the rear cover plastic part 31 is blocked from the outside world, so as to further improve the sealing of the shell accommodating cavity 11.

[0055] In addition, in order to ensure that the wiring PCB board 7 can be quickly and accurately installed on the front cover PCB fixing part 213 and the rear cover PCB fixing part 311, the present invention adopts the following structural design, specifically: the front cover PCB fixing part 213 is provided with a front cover positioning column 2131, and the rear cover PCB fixing part 311 is provided with a rear cover positioning column 3111, and the wiring PCB board 7 is respectively provided with positioning holes 71 corresponding to the front cover positioning column 2131 and the rear cover positioning column 3111, and the front cover positioning column 2131 and the rear cover positioning column 3111 are respectively inserted into the corresponding positioning holes 71 of the wiring PCB board 7.

[0056] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A linear motor for use in a humid environment, characterized in that: The motor housing (1) comprises a housing front cover (2) and a housing rear cover (3) located at the rear end side of the housing front cover (2); the housing front cover (2) comprises a front cover plastic part (21) and a front cover metal part (22); the front cover plastic part (21) and the front cover metal part (22) are injection molded into an integral structure; the housing rear cover (3) comprises a rear cover plastic part (31) and a rear cover metal part (32); the rear cover plastic part (31) and the rear cover metal part (32) are injection molded into an integral structure; the housing front cover (2) and the housing rear cover (3) are spliced, and the splicing position of the housing front cover (2) and the housing rear cover (3) is welded and sealed; A housing accommodating cavity (11) is formed inside the motor housing (1) between the housing front cover (2) and the housing rear cover (3), and a stator assembly (4) and a rotor assembly (5) are embedded in the housing accommodating cavity (11); the stator assembly (4) comprises a winding shaft (41) in a hollow shape, the winding shaft (41) is a hard plastic part, a middle electrode plate (42) is installed in the middle of the winding shaft (41), and the middle electrode plate (42) and the winding shaft (41) are injection molded into an integral structure; the winding shaft (41) is provided with a winding groove (411) surrounding the outer periphery of the central hole of the winding shaft (41), and a coil winding is wound in the winding groove (411); the winding shaft (41) is also provided with a wiring PIN pin (43) electrically connected to the coil winding, and the wiring PIN pin (43) and the winding shaft (41) are injection molded into an integral structure; The rotor assembly (5) is located in the central hole of the winding shaft (41). The rotor assembly (5) comprises a rotor nut (51), a magnet (52) which is sleeved on the outer periphery of the rotor nut (51) and is in the shape of a ring. The front end of the rotor nut (51) is provided with a rotor front end plastic part (53), and the rear end of the rotor nut (51) is provided with a rotor rear end plastic part (54). The rotor nut (51), the magnet (52), the rotor front end plastic part (53), and the rotor rear end plastic part are injection molded into an integral structure. The rotor assembly (5) also comprises a driving push rod (55). The driving push rod (55) comprises a driving part (551), an optical axis part (552), and a screw part (553) which are sequentially connected from front to back. The driving part (551), the optical axis part (552), and the screw part (553) are an integral structure. The screw part (54) of the driving push rod (55) 553) is screwed into the internal threaded hole of the rotor nut (51); the optical axis portion (552) of the driving push rod (55) is equipped with a stop pin (56) extending radially along the optical axis portion (552); the front cover plastic part (21) is provided with a stop groove (211) extending along the axial direction of the driving push rod (55) corresponding to the stop pin (56); the stop pin (56) extends into the stop groove (211) of the front cover plastic part (21). 211); the front cover plastic part (21) is provided with a front cover through hole (212) which is open to the front and communicates with the housing accommodating cavity (11); the optical axis part (552) of the driving push rod (55) is inserted into the front cover through hole (212) and the outer circumferential surface of the optical axis part (552) contacts the inside of the front cover through hole (212); the driving part (551) of the driving push rod (55) extends to the front end side of the front cover plastic part (21); The front cover plastic part (21) is provided with a front cover PCB fixing part (213), the rear cover plastic part (31) is provided with a rear cover PCB fixing part (311), a PIN pin through hole (6) is provided between the front cover PCB fixing part (213) and the rear cover PCB fixing part (311), and the wiring PIN pin (43) passes through the PIN pin through hole (6) from the inside to the outside and extends to the outer end side of the motor housing (1); The linear motor for use in a humid environment further comprises a wiring PCB board (7), the wiring PCB board (7) is installed between the front cover PCB fixing portion (213) and the rear cover PCB fixing portion (311), the wiring PCB board (7) covers the PIN pin through hole (6), and the wiring PIN pin (43) is welded to the wiring PCB board (7); A front end ball bearing (571) is installed between the front end plastic part (53) of the rotor and the front cover plastic part (21), and a rear end ball bearing (572) is installed between the rear end plastic part (54) of the rotor and the rear cover plastic part (31).

2. A linear motor for use in a humid environment according to claim 1, characterized in that: The front cover PCB fixing portion (213) is provided with a front cover positioning column (2131), the rear cover PCB fixing portion (311) is provided with a rear cover positioning column (3111), the wiring PCB board (7) is provided with positioning holes (71) corresponding to the front cover positioning column (2131) and the rear cover positioning column (3111), and the front cover positioning column (2131) and the rear cover positioning column (3111) are respectively inserted into the corresponding positioning holes (71) of the wiring PCB board (7).

3. The linear motor for use in a humid environment according to claim 1, characterized in that: The optical axis portion (552) of the driving push rod (55) is provided with a latch mounting hole (5521) which completely penetrates in the radial direction, and the anti-rotation latch (56) is inserted into the latch mounting hole (5521) of the optical axis portion (552), and the anti-rotation latch (56) and the latch mounting hole (5521) are interference fit.

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