CN113541372B - Dustproof stepping motor assembly - Google Patents
Dustproof stepping motor assembly Download PDFInfo
- Publication number
- CN113541372B CN113541372B CN202111071431.3A CN202111071431A CN113541372B CN 113541372 B CN113541372 B CN 113541372B CN 202111071431 A CN202111071431 A CN 202111071431A CN 113541372 B CN113541372 B CN 113541372B
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- Prior art keywords
- centering
- driving rod
- dustproof
- assembly
- rotating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/24—Structural association with auxiliary mechanical devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/124—Sealing of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/04—Balancing means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to a dustproof stepping motor component, which comprises: the centering device is used for centering the stepping motor; the dustproof joint is fixedly arranged on a driving rod of the centering device for the stepping motor; the dustproof joint is fixedly arranged at the top end of the rotating shaft of the driving rod, and the matching surface of the dustproof joint and the sleeve of the driving rod is in a convex shape. Through setting the fitting surface to the convex surface form, prevent that liquid, dust from entering into the axis of rotation from the fitting surface in, simultaneously, because the axis of rotation rotates the centrifugal force that produces, can make the dust also liquid outwards fly away along the fitting surface of convex surface form and go out, further improvement dirt-proof effect.
Description
Technical Field
The invention relates to the field of stepping motor control, in particular to a dustproof stepping motor assembly.
Background
A stepping motor is a motor that converts an electric pulse signal into a corresponding angular displacement or linear displacement, and is widely used in various fields as one of common driving control devices.
Among the prior art, step motor drives long drive rod and drives the device on upper portion and rotate, and during the axis of rotation disect insertion device, the fitting surface was the plane, can lead to during dust liquid etc. flowed into step motor along the axis of rotation, perhaps during drive gear, leads to the life of equipment to reduce.
The above problems are currently in need of solution.
Disclosure of Invention
The invention aims to provide a dustproof stepping motor assembly.
In order to solve the above technical problem, the present invention provides a dustproof stepping motor assembly comprising: the centering device is used for centering the stepping motor;
the dustproof joint is fixedly arranged on a driving rod of the centering device for the stepping motor;
the driving rod comprises a sleeve and a rotating shaft;
the sleeve is sleeved outside the rotating shaft;
the dustproof joint is fixedly arranged at the top end of the rotating shaft of the driving rod, and the matching surface of the dustproof joint and the sleeve of the driving rod is in a convex shape.
Furthermore, a gap is arranged between the dustproof joint and the matching surface of the sleeve.
Furthermore, a plurality of bristles are arranged at the bottom of the dustproof joint.
Further, a plurality of the bristles are arranged along the bottom edge of the dustproof joint.
Furthermore, a first guide post and a second guide post are arranged at the top of the dustproof joint;
the second guide post is a circular ring block which extends out along the middle part of the first guide post in the radial direction.
Furthermore, the bottom of the dustproof joint is provided with a limiting block.
Further, the dust joint and the rotating shaft of the driving rod are integrally formed.
Further, a centering device for a stepping motor includes:
the device comprises a working platform, a stepping motor, a driving rod, a lifting assembly and a centering assembly;
the driving rod penetrates through the working platform;
the stepping motor is fixedly arranged below the working platform and is suitable for driving the driving rod to rotate;
the driving rod penetrates through the centering assembly;
the centering assembly is arranged on the lifting assembly and is suitable for centering the driving rod when the lifting assembly is lifted.
Further, the centering assembly comprises a rotating sleeve ring, a centering chain, a sliding plate, a lifting plate and three centering gears;
a centering circular groove is formed in the center of the lifting plate;
the sliding plate is embedded in the lifting plate, and the centering area of the sliding plate leaks out of the centering circular groove;
a rotating opening suitable for the rotating lantern ring to be connected in a rotating mode is formed in the center of the sliding plate;
the driving rod penetrates through the rotating lantern ring and then extends out;
the three centering gears are arranged around the rotating lantern ring in an equilateral triangle and are fixed on the sliding plate through corresponding fixing columns;
the three centering gears synchronously rotate through a centering chain;
one chain link of the centering chain is connected with the outer wall of the rotating sleeve ring and is suitable for driving the centering chain to rotate when the rotating sleeve ring rotates;
each centering gear extends out of a supporting block towards the inner wall of the centering circular groove, and the supporting blocks are suitable for supporting against the inner wall of the centering circular groove when the centering chain rotates so as to complete centering of the driving rod inserted into the rotating sleeve ring.
Furthermore, the centering chain is fixedly connected with the rotating sleeve ring through a telescopic block, and the joint of the telescopic block and the centering chain is rotatably connected.
The invention has the beneficial effects that the invention provides a dustproof stepping motor component which comprises: the centering device is used for centering the stepping motor; the dustproof joint is fixedly arranged on a driving rod of the centering device for the stepping motor; the dustproof joint is fixedly arranged at the top end of the rotating shaft of the driving rod, and the matching surface of the dustproof joint and the sleeve of the driving rod is in a convex shape. Through setting the fitting surface to the convex surface form, prevent that liquid, dust from entering into the axis of rotation from the fitting surface in, simultaneously, because the axis of rotation rotates the centrifugal force that produces, can make the dust also liquid outwards fly away along the fitting surface of convex surface form and go out, further improvement dirt-proof effect.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is an isometric view of a centering device for a stepper motor provided by the present invention.
Fig. 2 is a cross-sectional view of a centering device for a stepping motor provided in the present invention.
Fig. 3 is an enlarged view at a in fig. 2.
FIG. 4 is a state diagram of the centering assembly centering process provided by the present invention.
Fig. 5 is a state diagram after centering of the centering assembly provided by the present invention is completed.
Fig. 6 is a front view of a centering device for a stepper motor provided in accordance with the present invention.
Fig. 7 is an enlarged view at B in fig. 3.
Fig. 8 is a schematic structural view of a centering gear provided by the present invention.
Fig. 9 is a schematic structural view of the dust joint provided by the present invention.
In the figure: 110. a working platform; 120. a stepping motor; 130. a drive rod; 131. a sleeve; 1311. a stroke slot; 1311a, first stroke; 1311b, second stroke; 1311c, third stroke; 132. a rotating shaft; 140. a centering assembly; 141. rotating the lantern ring; 142. a centering chain; 1421. a telescopic block; 143. a sliding plate; 144. a lifting plate; 145. a centering gear; 1451. a holding block; 1452. a roll axis; 1453. a fixed part; 1453a, a holding plate; 1454. a bending section; 150. a lifting assembly; 151. a screw rod; 152. lifting teeth; 153. a synchronization chain; 200. a dust joint; 210. a mating surface; 220. brushing; 230. a first guide post; 240. a second guide post; 250. and a limiting block.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1
As shown in fig. 1, embodiment 1 provides a dustproof stepping motor assembly including: the centering device is used for centering the stepping motor; the dustproof joint is fixedly arranged on the driving rod 130 of the centering device for the stepping motor; the driving rod 130 includes a sleeve 131 and a rotating shaft 132; the sleeve 131 is sleeved outside the rotating shaft 132; the dust-proof joint is fixedly arranged at the top end of the rotating shaft 132 of the driving rod 130, and the matching surface of the dust-proof joint and the sleeve 131 of the driving rod 130 is convex. Through setting the fitting surface to the convex surface form, prevent that liquid, dust from entering into the axis of rotation from the fitting surface in, simultaneously, because the axis of rotation rotates the centrifugal force that produces, can make the dust also liquid outwards fly away along the fitting surface of convex surface form and go out, further improvement dirt-proof effect.
A centering device for a stepper motor 120, comprising: a working platform 110, a stepping motor 120, a driving rod 130, a lifting assembly 150 and a centering assembly 140; the drive rod 130 passes through the work platform; the stepping motor 120 is fixedly disposed below the working platform 110 and adapted to drive the driving rod 130 to rotate; the driving rod 130 passes through the centering assembly 140; the centering assembly 140 is arranged on the lifting assembly 150 and is suitable for centering the driving rod 130 when the lifting assembly 150 rises, and the liftable centering assembly 140 is arranged to finish centering the driving rod 130 in the lifting process, so that the problem that the top of the longer driving rod 130 cannot be centered through a bearing in a specific environment is solved, and the eccentricity of the driving rod 130 when a grinding wheel is driven by the driving rod 130 to polish or polish a plurality of stacked articles is avoided.
Referring to fig. 2 and 3, in the present embodiment, the centering assembly 140 includes a rotating collar 141, a centering chain 142, a sliding plate 143, a lifting plate 144 and three centering gears 145; a centering circular groove is formed in the center of the lifting plate 144; the sliding plate 143 is embedded in the lifting plate 144, and the centering area of the sliding plate 143 leaks out of the centering circular groove; a rotating port suitable for the rotating collar 141 to be rotatably connected is formed in the center of the sliding plate 143; the driving rod 130 extends out after passing through the rotating collar 141; the three centering gears 145 are arranged around the rotating collar 141 in an equilateral triangle and fixed on the sliding plate 143 through corresponding fixing posts; the three centering gears 145 rotate synchronously through the centering chain 142; one of the links of the centering chain 142 is connected to the outer wall of the rotating collar 141, and is adapted to drive the centering chain 142 to rotate when the rotating collar 141 rotates; each centering gear 145 extends to form a supporting block 1451 towards the inner wall of the circular centering groove, and the supporting block 1451 is adapted to support against the inner wall of the circular centering groove when the centering chain 142 rotates, so as to complete the centering of the driving rod 130 inserted into the rotating collar 141. The initial state of the centering assembly 140 is shown in fig. 3, in which the angle of deflection of the abutment block 1451 of each centering gear 145 is the same. The centering assembly 140 is in a centering state as shown in fig. 4, and when the rotating collar 141 rotates, the centering chain 142 is driven to move, and at this time, the centering gear 145 engaged with the centering chain 142 is simultaneously rotated by the same angle, and, when the driving lever 130 is eccentric, the supporting blocks 1451 of one or two centering gears 145 will contact with the centering circular groove first, at this time, the rotating collar 141 continues to rotate, the sliding plate 143 generates displacement in the lifting plate 144, until 3 supporting blocks 1451 all support against the inner wall of the centering circular groove, at this time, centering is completed, as shown in fig. 5, a soft centering method is adopted, i.e., the driving lever 130 is not directly moved, but the carrier of the driving lever 130, i.e., the sliding plate, is moved, to perform centering of the sliding plate, thereby indirectly enabling the driving rod 130 to complete the centering, avoiding the hard contact between the driving rod 130 and the rotating collar 141 and reducing the abrasion of the driving rod 130.
Referring to fig. 3, the centering chain 142 is fixedly connected to the rotating collar 141 through a telescopic block, and a connection portion of the telescopic block 1421 and the centering chain 142 is rotatably connected.
In this embodiment, the driving rod 130 includes a sleeve 131 and a rotating shaft 132 disposed inside the sleeve 131; the rotation shaft 132 is adapted to be rotated by the stepping motor 120. The sleeve 131 is used for protection and avoiding accidental touch, and meanwhile, the sleeve 131 can reduce abrasion between the rotating shaft 132 and the rotating collar 141.
Referring to fig. 6, a stroke groove 1311 is formed in an outer wall of the sleeve 131, and a moving block (not shown) is fixedly disposed on an inner wall of the rotating collar 141 corresponding to the stroke groove 1311; the moving block is clamped in the stroke groove 1311 and is adapted to move in the stroke groove 1311 when the rotating collar 141 moves up and down along with the lifting plate 144; the stroke slot 1311 includes a first stroke 1311a and a second stroke 1311 b; the first stroke 1311a is provided at the lower end of the sleeve 131, and the second stroke 1311b is provided at the upper portion of the first stroke 1311 a; the first stroke 1311a is arranged around the sleeve 131, and when the moving block of the rotating collar 141 moves to the boundary between the first stroke 1311a and the second stroke 1311b, each of the abutting blocks 1451 abuts against the inner wall of the centering circular groove. In the present embodiment, the encircling angle of the first stroke 1311a is related to the angle of rotation required by the centering gear 145, that is, the angle of rotation required by the centering gear 145 is related to the length of movement of the centering chain 142, and the length of movement of the centering chain 142 is related to the angle of rotation of the rotating collar 141, so that the angle of encircling required by the first stroke 1311a is defined by the angle of rotation required by the centering gear 145, and the specific corresponding relationship needs to be set according to the dimensional relationship of each component, and this embodiment is not further described.
Referring to fig. 7 and 8, the abutting block 1451 and the abutting end of the centering circular groove are provided with a rolling shaft 1452; the rolling shaft 1452 is rotatably disposed on the supporting block 1451. The rolling connection mode is adopted, so that the abrasion of the abutting block 1451 and the centering circular groove is reduced, and the service life is prolonged.
In this embodiment, the supporting block 1451 includes a fixing portion 1453 and a bending portion 1454; the fixing portion 1453 is rotatably connected to the bent portion 1454, and an engaging structure is disposed at the connection position, and the bent portion 1454 is engaged with the fixing portion 1453 when rotated; the bending portion 1454 abuts against the circular centering groove, and the engaging force between the bending portion 1454 and the fixing portion 1453 is slightly larger than the abutting force between the bending portion 1454 and the circular centering groove. When the abutting force between the bending part 1454 and the centering circular groove is larger than a normal value, the resistance applied when the lifting assembly 150 is lifted is increased, the load of the motor of the lifting assembly 150 is increased, and when the load is detected to be increased, an alarm prompt can be sent to avoid the abnormal state of the centering assembly 140.
Referring to fig. 6-8, specifically, the stroke slot 1311 further includes a third stroke 1311c, and the third stroke 1311c is disposed above the second stroke 1311b and surrounds the sleeve 131; the fixing part 1453 extends to the centering circular groove to form a butting plate 1453 a; when the rotating collar 141 slides in the third stroke, the force of the bending portion 1454 abutting against the circular centering groove gradually increases, and when the force of the bending portion 1454 abutting against the circular centering groove is greater than the force of the bending portion 1454 engaging with the fixing portion 1453, the bending portion 1454 disengages from the fixing portion 1453, and the abutting plate 1453a of the fixing portion 1453 abuts against the circular centering groove. The rising height of the centering assembly 140 is limited by setting a third stroke, when the force of the bent part 1454 abutting against the centering circular groove is greater than the force of the bent part 1454 engaging with the fixing part 1453, the bent part 1454 is disengaged from the fixing part 1453, and at this time, the load of the driving motor of the lifting assembly 150 also shows an abnormal condition, and an alarm is given to stop driving the centering assembly 140, so as to prevent the centering assembly 140 from contacting with an external device connected to the upper part of the driving rod 130.
Referring to fig. 1, in the present embodiment, the lifting assembly 150 includes a driving motor and two lead screws 151; the two screw rods 151 are rotatably arranged on the working platform 110, and the driving rod 130 is arranged between the two screw rods 151; the centering assembly 140 is provided with an internal thread at a position corresponding to the screw rod 151, and is suitable for driving the centering assembly 140 to ascend and descend when the screw rod 151 rotates; the bottom end of the screw rod 151 is fixedly provided with a lifting tooth 152 which is rotationally connected with the working platform 110; the working platform 110 is also provided with a driving gear for driving the lifting gear 152; the driving gear and the two lifting teeth 152 are arranged in a triangular shape and are connected through a synchronous chain 153; the driving motor is used for driving the driving gear to rotate, so as to drive the screw rod 151 to rotate.
The present embodiment also provides a centering method for the stepping motor 120, including the centering device for the stepping motor 120 as described above; the method completes the centering of the driving rod 130 by driving the centering assembly 140 to ascend through the lifting assembly 150. Through setting up liftable centering subassembly 140, accomplish the centering to actuating lever 130 at the lift in-process, solved longer actuating lever 130 under specific environment, can't adopt the top to carry out the problem of centering through the bearing, avoided the eccentricity of actuating lever 130 when polishing or polish a plurality of range upon range of article through actuating lever 130 drive emery wheel.
Referring to fig. 9, a gap is provided between the dust-proof joint 200 and the mating surface 210 of the sleeve 131. The slope is formed by the gap provided so that liquid and dust can be left along the slope, preventing them from entering the inside of the rotating shaft 132.
In this embodiment, the bottom of the dust-proof joint 200 is provided with a plurality of bristles 220. The plurality of bristles 220 are disposed along the bottom edge of the dust cap 200. The matching surface 210 of the sleeve 131 and the dust-proof connector 200 is cleaned by the bristles 220, and the bristles 220 complete the cleaning of the matching surface 210 during the dust-proof rotation.
In this embodiment, the top of the dust-proof joint 200 is provided with a first guiding column 230 and a second guiding column 240; the second guiding column 240 is a circular ring block extending radially from the middle of the first guiding column 230. The concentricity of the work piece attached to the dust-proof joint and the rotation shaft 132 is ensured by the first guide post 230 for the first guide and then the second guide post 240 having a larger diameter than the first guide post 230 for the second guide, preventing the work piece from being eccentric when attached.
In this embodiment, the bottom of the dust-proof joint 200 is provided with a limit block 250. Prevent through stopper 250 that the work piece from taking place relative displacement with dust joint 200, ensure the stability of work piece connection on dust joint 200, carry on spacingly when two planes through the stopper contact with the work piece.
In other embodiments, the dust joint 200 is integrally formed with the rotation shaft of the driving rod 130. The installation can be performed by inserting the rotating shaft 132 into the sleeve 131 and then connecting the rotating shaft with the driving motor in a transmission manner.
In summary, the present invention provides a dustproof stepping motor assembly, including: the centering device is used for centering the stepping motor; the dustproof joint is fixedly arranged on a driving rod of the centering device for the stepping motor; the dustproof joint is fixedly arranged at the top end of the rotating shaft of the driving rod, and the matching surface of the dustproof joint and the sleeve of the driving rod is in a convex shape. Through setting the fitting surface to the convex surface form, prevent that liquid, dust from entering into the axis of rotation from the fitting surface in, simultaneously, because the axis of rotation rotates the centrifugal force that produces, can make the dust also liquid outwards fly away along the fitting surface of convex surface form and go out, further improvement dirt-proof effect.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A dirt-proof step motor subassembly characterized in that includes: the centering device is used for centering the stepping motor;
the dustproof joint is fixedly arranged on a driving rod of the centering device for the stepping motor;
the driving rod comprises a sleeve and a rotating shaft;
the sleeve is sleeved outside the rotating shaft;
the dustproof joint is fixedly arranged at the top end of the rotating shaft of the driving rod, and the matching surface of the dustproof joint and the sleeve of the driving rod is in a convex shape;
the centering device for a stepping motor includes:
the device comprises a working platform, a stepping motor, a driving rod, a lifting assembly and a centering assembly;
the driving rod penetrates through the working platform;
the stepping motor is fixedly arranged below the working platform and is suitable for driving the driving rod to rotate;
the driving rod penetrates through the centering assembly;
the centering assembly is arranged on the lifting assembly and is suitable for centering the driving rod when the lifting assembly is lifted.
2. The dust protected stepper motor assembly of claim 1, wherein a gap is provided between the dust tab and the mating surface of the sleeve.
3. The dust protected stepper motor assembly of claim 2, wherein the bottom of the dust boot connector is provided with a plurality of bristles.
4. The dust protected stepper motor assembly of claim 3, wherein a plurality of the bristles are disposed along a bottom edge of the dust joint.
5. The dustproof stepper motor assembly of claim 1, wherein the top of the dustproof joint is provided with a first guide post and a second guide post;
the second guide post is a circular ring block which extends out along the middle part of the first guide post in the radial direction.
6. The dustproof stepper motor assembly of claim 1, wherein the bottom of the dustproof joint is provided with a stop block.
7. The dustproof stepper motor assembly of claim 1, wherein the dust tab is integrally formed with the rotational shaft of the drive rod.
8. The dustproof stepper motor assembly of claim 1,
the centering assembly comprises a rotating sleeve ring, a centering chain, a sliding plate, a lifting plate and three centering gears;
a centering circular groove is formed in the center of the lifting plate;
the sliding plate is embedded in the lifting plate, and the centering area of the sliding plate leaks out of the centering circular groove;
a rotating opening suitable for the rotating lantern ring to be connected in a rotating mode is formed in the center of the sliding plate;
the driving rod penetrates through the rotating lantern ring and then extends out;
the three centering gears are arranged around the rotating lantern ring in an equilateral triangle and are fixed on the sliding plate through corresponding fixing columns;
the three centering gears synchronously rotate through a centering chain;
one chain link of the centering chain is connected with the outer wall of the rotating sleeve ring and is suitable for driving the centering chain to rotate when the rotating sleeve ring rotates;
each centering gear extends out of a supporting block towards the inner wall of the centering circular groove, and the supporting blocks are suitable for supporting against the inner wall of the centering circular groove when the centering chain rotates so as to complete centering of the driving rod inserted into the rotating sleeve ring.
9. The dust protected stepper motor assembly of claim 8, wherein the centering chain is fixedly connected to the rotating collar via a telescoping block, the telescoping block being rotatably connected to the centering chain at a junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111071431.3A CN113541372B (en) | 2021-09-14 | 2021-09-14 | Dustproof stepping motor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111071431.3A CN113541372B (en) | 2021-09-14 | 2021-09-14 | Dustproof stepping motor assembly |
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| Publication Number | Publication Date |
|---|---|
| CN113541372A CN113541372A (en) | 2021-10-22 |
| CN113541372B true CN113541372B (en) | 2021-11-30 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101949340B (en) * | 2010-03-11 | 2019-02-22 | 哈尔滨安龙迪环保科技有限公司 | A kind of electric control EGR valve for reducing operating temperature and improving functional reliability |
| DE102017102630B4 (en) * | 2017-02-09 | 2020-08-06 | Johnson Electric Germany GmbH & Co. KG | Linear stepper motor, device and method for producing a linear stepper motor with a ball-bearing rotor shaft |
| CN106914762A (en) * | 2017-05-01 | 2017-07-04 | 桐乡市百宝电子商务有限公司 | A kind of centering and clamping apparatus of stairstepping sleeve |
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