CN218015813U - Lathe center frame capable of accurately adjusting center - Google Patents
Lathe center frame capable of accurately adjusting center Download PDFInfo
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- CN218015813U CN218015813U CN202221589886.4U CN202221589886U CN218015813U CN 218015813 U CN218015813 U CN 218015813U CN 202221589886 U CN202221589886 U CN 202221589886U CN 218015813 U CN218015813 U CN 218015813U
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Abstract
The utility model discloses a lathe centre frame that can accurate adjustment center, including centre frame body, slide, slip table and slip table drive unit, the slide be used for with the lathe in the horizontal direction relative slip, the relative slip of slip table in the longitudinal direction relative slip, the centre frame body with the slip table is fixed, the geometric centre of centre frame body and the geometric centre of main shaft, or the geometric centre collineation of tailstock, slip table drive unit drive slip table for the slide horizontal slip on the longitudinal direction, be used for the fine setting the geometric centre of centre frame body with the geometric centre of main shaft, the geometric centre collineation of tailstock. The utility model has the advantages of the adjustment speed is fast and the adjustment is accurate, requires not highly to operator's skill proficiency, is convenient for guarantee by the uniformity of processing product size. The center frame body can be quickly and accurately adjusted, so that the geometric center of the center frame body is superposed with the central axis of the main shaft, and the position of the center frame is quickly and accurately adjusted.
Description
Technical Field
The utility model relates to a lathe technical field specifically is a but the geometric center of accurate adjustment centre frame and the centre frame of the axis coincidence of main shaft.
Background
When a lathe is used for processing a long product, under the influence of gravity, the middle part of the processed product can be bent downwards, the geometric center of the cross section of the processed product is lower than the axle center of a main shaft or a top point of the lathe, when a turning tool of the lathe moves transversely along the processed part for turning, the distance between the tool nose of the turning tool and the center of the cross section of the processed part can be changed, and the error in the axial direction of the product is uneven.
The centre frame of artifical aligning that present lathe used, mostly manual mode adjustment centre frame's position, the geometric centre that makes the three supporting wheel of centre frame through the adjustment, keep coincideing with the apical axis of main shaft and tailstock, realize the purpose that the centre frame aims at the aligning, nevertheless because manual adjustment has certain subjectivity, consequently when batch production, there is the defect that the uniformity is not good in the size of by the processing product, the main problem lies in the manual adjustment back, the coincidence of the geometric centre of the three supporting wheel of centre frame and the axis of main shaft is not good enough.
The self-centering center frame is arranged on the market, the center positions of the supporting wheels of the center frame can be automatically adjusted, and the three supporting wheels of the self-centering center frame are adjusted respectively when the positions are automatically adjusted, so that the adjusting effect in actual use is not ideal, the accurate coincidence of the geometric centers of the three supporting wheels after automatic adjustment and the central axis of the main shaft cannot be ensured, and the center positioning effect is not good.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a but the position of accurate adjustment centre frame to make the lathe centre frame of the accurate coincidence of the geometric centre of the three supporting wheel of centre frame and the axis of main shaft.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a but lathe centre frame at accurate adjustment center, includes centre frame body, slide, slip table and slip table drive unit, the slide is used for with the lathe relative slip in the transverse direction, the relative slip of slip table in the longitudinal direction, the centre frame body with the slip table is fixed, the geometric centre of centre frame body and the geometric centre collineation of main shaft, slip table drive unit drive slip table for the slide horizontal slip on the longitudinal direction for the slide for the fine setting the geometric centre of centre frame body with the geometric centre of main shaft, the geometric centre collineation of tailstock.
In one embodiment, the sliding table driving unit is a gear rack device driven by a worm gear and worm reducer, a fine adjustment motor fixed with the sliding table drives a worm to rotate, the worm drives a worm wheel to rotate, the worm gear drives a gear to rotate, the rack is fixed with the sliding table, and the gear and the rack are matched with the sliding table to slide along the longitudinal direction relative to the sliding table.
In one embodiment, three supporting seats are circumferentially distributed on the center frame body at equal angles, each supporting seat is provided with a sliding device, each sliding device is provided with a telescopic rod which slides relative to the sliding device, the sliding directions of all the telescopic rods face to the geometric center of the center frame body along the radial direction of the center frame body, one end, close to the geometric center of the center frame body, of each telescopic rod is provided with a supporting wheel used for supporting the outer circular surface of a rotating processed product, and the three telescopic rods slide relative to the sliding devices in a telescopic mode and lean against or far away from the geometric center of the center frame body.
In one embodiment, the sliding device is a synchronous movement device, the three telescopic rods retract into the sliding device, when the three support wheels are stopped at the initial positions, the geometric centers of the three support wheels are coincident with the geometric center of the central frame body, and when the three telescopic rods slide towards the central frame relative to the respective sliding devices, the geometric centers of the three support wheels are kept coincident with the geometric center of the central frame body at any moment.
In one embodiment, the synchronous movement device comprises a servo motor control unit, a gear and rack transmission unit and a servo motor, wherein the servo motor control unit is connected with the servo motor, the servo motor drives a gear shaft to rotate, the gear is fixed with a gear shaft, the gear shaft is rotationally connected with a sliding device, a rack is fixed with a telescopic rod, and the rack is correspondingly meshed with the gear.
In one embodiment, the servo motor is in transmission connection with the gear shaft through a speed reducer.
In one embodiment, the laser positioning device further comprises a laser emitting head, a transmission tube and a laser receiving head, wherein the laser emitting head is used for being fixed with the spindle box, the receiving head is used for being mounted on the tailstock and corresponding to the laser emitting head in position and used for receiving reference laser emitted by the laser emitting head, the optical axis of the reference laser is parallel to the central axis of the spindle, the transmission tube is fixed on the central frame body, and the optical axis of transmission light used for transmitting the laser on the transmission tube is overlapped with the optical axis of the reference laser.
In one embodiment, the transmission tube comprises a tube barrel and two light-transmitting plates, the two light-transmitting plates are fixed on the inner wall of the tube barrel at intervals in the tube barrel, light-transmitting holes for transmitting the reference laser are correspondingly arranged at the centers of the two light-transmitting plates respectively, and the two light-transmitting holes are coincided with the axis of the transmitted light in a collinear manner.
In one embodiment, the number of the laser emitting heads, the transmission tubes and the laser receiving heads is two, the two pairs of laser emitting heads, the transmission tubes and the laser receiving heads are arranged in a collinear manner along the longitudinal direction and are correspondingly fixed with the spindle box, the center frame body and the tailstock, each pair of laser emitting heads, the transmission tubes and the laser receiving heads are arranged in a transverse collinear manner, and a connecting line of centers of each pair of laser emitting heads, the transmission tubes and the laser receiving heads is parallel to a central axis of the spindle.
In one embodiment, the center frame further comprises a vertical sliding seat, the vertical sliding seat is connected with the sliding table in a sliding mode in the vertical direction, and the center frame body is fixed with the vertical sliding seat.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a but lathe centre frame at accurate adjustment center, at first make the initial position of the geometric centre of centre frame body be located the below of the axis of main shaft, generally through setting up and adjustment in the stage of dispatching from the factory, the geometric centre that realizes the centre frame body is under the main shaft axis, in subsequent use, when the geometric centre of centre frame body and the situation of vertical skew take place for the main shaft axis, through slip table drive unit drive slip table longitudinal movement, the vertical position of correction centre frame body makes its geometric centre and the vertical correspondence of main shaft axis on the longitudinal direction, then, only need adjust the height of centre frame body on the Z axle direction, just can adjust the height of centre frame body geometric centre, coincide with the main shaft axis, just can ensure that the geometric centre of centre frame body accurately aligns with the axis of main shaft, have the fast and accurate advantage of adjustment, the skill requirement for the operator, be convenient for guarantee by the uniformity of processed product size.
In the process of processing the processed products, the three supporting seats are arranged on the center frame body in the scheme, a sliding device is arranged on each supporting seat, each sliding device is provided with a telescopic rod sliding relative to the sliding device, all the sliding directions of the telescopic rods face to the geometric center of the center frame body, the telescopic rods synchronously move towards the geometric center of the center frame body, supporting wheels are arranged at the inner ends of the telescopic rods and used for supporting the outer circular surface of the processed products in a rotating mode, the geometric centers of the supporting wheels coincide with the central axis of a main shaft, in the processing process, each supporting wheel is driven by a synchronous movement driving device and synchronously lean against the geometric center of the center frame body, only appropriate driving force needs to be set for the synchronous movement driving device, the geometric centers of the processed shaft products can be kept to coincide with the central axis of the main shaft, the diameter of the processed shaft is reduced all the time, and the three supporting wheels are close to the surface of the shaft products. The center frame body can be quickly and accurately adjusted by matching the laser emitting head, the transmission tube and the laser receiving head which are used for being fixed with the main shaft, the center frame body and the tailstock and by utilizing the laser emitting head to emit a laser line for reference of the tailstock, so that the geometric center of the center frame body is superposed with the central axis of the main shaft, and the position of the center frame is accurate after the adjustment process is quickly adjusted.
Drawings
FIG. 1 is a perspective view of the center frame of the present invention fixed to a lathe;
fig. 2 is a top view of the center frame of the present invention fixed to a lathe;
FIG. 3 is a schematic view of the laser emitting head, the transmission tube and the laser receiving head of the present invention;
FIG. 4 is a side view of the center frame body of the present invention connected to the slide base through the slide table;
FIG. 5 is a side view of the center frame body of the present invention connected to the slide base through the slide table;
fig. 6 is a schematic top view of the laser emitting head, the transmission tube and the laser receiving head of the present invention.
Description of reference numerals:
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1 and fig. 2, the present invention provides a lathe center frame capable of accurately adjusting center, which includes a center frame body 2, a sliding base 23, a sliding base 31 and a sliding base driving unit, wherein the sliding base 23 is used for sliding with the lathe 1 in the transverse direction relative to the transverse rail 26 on the lathe 1, the sliding base 31 slides relative to the sliding base in the longitudinal direction, the center frame body 2 is fixed with the sliding base 31, and the geometric center of the center frame body 2 and the geometric center of the spindle 13 or the geometric center of the tailstock 3 are collinear. Centre frame body 2 is fixed in slip table 31, slip table and slide 23 pass through the mutual sliding connection of slide rail 39 that sets up in the vertical direction, the back is debugged in the installation of lathe manufacturing usually, the geometric centre of main shaft 13 and the geometric centre of tailstock keep the coincidence state each other, it is located the axis of main shaft 13 under to ensure the geometric centre of centre frame body 2, in use often only need go on appropriate adjustment to the centre frame body in the vertical direction, make the geometric centre of centre frame body 2 and the axis coincidence of main shaft 13 can, have adjustment process convenient and fast, the high advantage of the degree of accuracy.
Referring to fig. 3, the slide table driving unit 9 drives the slide table 31 to horizontally slide in the longitudinal direction relative to the slide base 23, so as to finely adjust the geometric center of the central frame body 2 to be aligned with the geometric center of the spindle 13 or the geometric center of the tail base 3, and keep the three geometric centers in a collinear geometric relationship, so that when the processed product 5 is processed, the geometric centers of the processed product 5 at the three positions are kept on a straight line, and the center of the cross section of the processed product 5 is kept to be coincident with the central axis of the spindle, thereby improving the accuracy of the size of the processed product.
In one embodiment, the used sliding table driving unit 9 is a gear and rack driving device driven by a worm gear reducer, a fine tuning motor is fixed with the sliding seat and drives a worm to rotate, the worm drives a worm gear to rotate, the worm gear drives the gear to rotate, the rack is fixed with the sliding table, the gear is matched with the rack, the sliding table 31 slides longitudinally relative to the sliding seat, the rotation speed of the fine tuning motor is set to be a motor capable of adjusting speed through a control module, the rotation speed of the fine tuning motor is adjusted, the accuracy of longitudinal adjustment of the sliding table is improved, the geometric center of the center frame body 2 can be conveniently adjusted to be aligned with the central axis of the main shaft, and after the longitudinal position of the center frame body 2 is adjusted, the self-locking function of the worm gear reducer can prevent the sliding table 31 from moving longitudinally.
Referring to fig. 4 and 5, in order to adjust the position of the center frame body 2 in the vertical direction, a vertical sliding device sliding in the vertical direction is provided, the center frame body is fixed to a sliding sleeve on the side perpendicular to the central axis of the main shaft, the corresponding sliding rail axis is fixed to the sliding table vertically, the sliding sleeve of the center frame body is matched with a sliding rail 39 to slide relative to the sliding table, a rack 38 is fixed to the sliding table, a vertical gear motor 36 is fixed to the lower end of the center frame body, an output shaft of the vertical gear motor 36 is fixed to a gear, a matched rack is fixed to the sliding table, the rack corresponds to the position of the gear, the gear and the rack are meshed with each other, when the height of the center frame body in the vertical direction needs to be adjusted, the vertical gear motor works, the drive gear rotates, the gear and the rack is matched with the gear to push the center frame body to ascend or descend, and the vertical sliding device adjusts the geometric center of the center frame body to coincide with the central axis of the main shaft.
Referring to fig. 1 and 2, three support seats are circumferentially distributed at equal angles on the center frame body 2, each support seat is provided with a sliding device, each sliding device is provided with a telescopic rod 20 sliding relative to the sliding device, the sliding directions of all telescopic rods 20 are along the radial direction of the center frame body and face the geometric center of the center frame body, one end of each telescopic rod 20 close to the geometric center of the center frame body is provided with a support wheel 22 for supporting the outer circular surface of a rotating processed product, and the three telescopic rods 20 telescopically slide relative to the sliding devices and are close to or far away from the geometric center of the center frame body 2.
In one embodiment, the sliding device is a synchronous moving device 21, three telescopic rods retract into the sliding device, when the three support wheels 22 stop at the initial position, the geometric centers of the three support wheels 22 coincide with the geometric center of the central frame body, and during the sliding of the three telescopic rods 20 relative to the respective sliding devices toward the central frame, the geometric centers of the three support wheels 22 are kept coincident with the geometric center of the central frame body at any time.
In one embodiment, the synchronous movement device comprises a servo motor control unit, a gear and rack transmission unit and a servo motor, wherein the servo motor control unit is connected with the servo motor, the servo motor drives a gear shaft to rotate, the gear is fixed with a gear shaft, the gear shaft is rotationally connected with the sliding device, the rack is fixed with the telescopic rod, and the rack is correspondingly meshed with the gear.
In one embodiment, the servo motor is in transmission connection with the gear shaft through the speed reducer, and transmission torque is improved.
In one embodiment, the laser lathe further comprises a laser emitting head 61, a transmission tube 62 and a laser receiving head 63, wherein the laser emitting head 61 is used for being fixed with the headstock, the receiving head 63 is used for being installed on the tailstock 3 and corresponding to the position of the laser emitting head and used for receiving reference laser emitted by the laser emitting head 61, the optical axis of the reference laser is parallel to the central axis of the spindle 13, the transmission tube 62 is fixed on the central frame body, and the optical axis of transmission light used for transmitting the laser on the transmission tube 62 is coincident with the optical axis of the reference laser.
Referring to fig. 6, in one embodiment, the transmission tube 62 includes a tube and two transparent plates 65 fixed to the inner wall of the tube at intervals, the centers of the two transparent plates are respectively provided with a transparent hole 66 for transmitting the reference laser, and the two transparent holes are aligned with the axis of the transmitted light.
In one embodiment, the number of the laser emitting heads, the transmission tubes and the laser receiving heads is two, the two pairs of laser emitting heads, the transmission tubes and the laser receiving heads are arranged in a collinear manner along the longitudinal direction and are correspondingly fixed with the spindle box, the center frame body and the tailstock, each pair of laser emitting heads, transmission tubes and laser receiving heads are arranged in a collinear manner transversely, and connecting lines of centers of each pair of laser emitting heads, transmission tubes and laser receiving heads are parallel to a central axis of the spindle.
In one embodiment, the center frame further comprises a vertical sliding seat, the vertical sliding seat is connected with the sliding table in a sliding mode in the vertical direction, and the center frame body is fixed with the vertical sliding seat.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a but lathe centre frame at accurate adjustment center, at first make the initial position of the geometric centre of centre frame body, be located the below of the axis of main shaft, generally through setting up and adjustment in the stage of dispatching from the factory, make the geometric centre of centre frame body be under the main shaft axis, in subsequent use, when the geometric centre of centre frame body and the situation of vertical skew take place for the main shaft axis, through slip table drive unit drive slip table longitudinal movement, correct the longitudinal position of centre frame body, make its geometric centre and main shaft axis vertical correspondence in longitudinal direction, then, only need adjust the height of centre frame body in Z axle orientation, just can adjust the height of centre frame body geometric centre, coincide with the main shaft axis, just can ensure that the geometric centre of centre frame body accurately aligns with the axis of main shaft, have the speed of adjustment fast and adjust accurate advantage, the skill proficiency requirement to the operator is not high, be convenient for guaranteeing the uniformity of machined product size.
In the in-process of processing the product being processed, this scheme adopts and sets up three supporting seat on the centre frame body, be equipped with slider on every supporting seat, every slider sets up the gliding telescopic link of relative slider, the gliding direction of all telescopic links is towards the geometric centre of centre frame body, and the telescopic link is towards the geometric centre synchronous motion of centre frame body, telescopic link inner sets up the supporting wheel, an outer disc for supporting the product being processed is rotatory, the geometric centre of supporting wheel coincides with the axis of main shaft mutually, in the course of working, every supporting wheel is under the synchronous motion drive arrangement drive, lean on the geometric centre to the centre frame body in step, only need set up suitable drive power for the synchronous motion drive arrangement, just can make the geometric centre of axle center coincidence with the main shaft of the axle center that the axle type product was processed, along with the diameter of being processed the axle diminishes all the time, three supporting wheel is close to each other and pastes on the surface at the axle type product. The center frame body can be quickly and accurately adjusted by matching a laser emitting head, a transmission tube and a laser receiving head which are used for being fixed with the main shaft, the center frame body and the tailstock and by utilizing the laser emitting head to emit a laser line for tailstock reference, so that the geometric center of the center frame body is superposed with the central axis of the main shaft, and the position of the center frame is accurate after the adjustment process.
Those not described in detail in this specification are within the skill of the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a but lathe centre frame at accurate adjustment center which characterized in that, includes centre frame body, slide, slip table and slip table drive unit, the slide be used for with the lathe relative slip in the transverse direction, the relative slip of slip table in the longitudinal direction relative slip, the centre frame body with the slip table is fixed, the geometric centre of centre frame body and the geometric centre collineation of main shaft, slip table drive unit drive slip table for the slide horizontal slip on the longitudinal direction for the slide, be used for the fine setting the geometric centre of centre frame body with the geometric centre of main shaft, the geometric centre collineation of tailstock.
2. The lathe center rest capable of accurately adjusting the center according to claim 1, wherein: the sliding table driving unit is a gear rack device driven by a worm and gear speed reducer, a fine adjustment motor fixed with the sliding table drives a worm to rotate, the worm drives a worm wheel to rotate, a worm and gear drive gear rotates, a rack is fixed with the sliding table, and the gear and the rack are matched with the sliding table to slide along the longitudinal direction relative to the sliding table.
3. The lathe center rest capable of accurately adjusting the center according to claim 2, wherein: three supporting seats are circumferentially distributed at equal angles on the central frame body, a sliding device is arranged on each supporting seat, each sliding device is provided with a telescopic rod sliding relative to the sliding device, the sliding directions of all the telescopic rods are along the radial direction of the central frame body, and towards the geometric center of the central frame body, each telescopic rod is close to one end of the geometric center of the central frame body and is provided with a supporting wheel used for supporting the outer circular surface of a rotating processed product, and the three telescopic rods slide relative to the sliding devices in a telescopic mode and lean on the geometric center of the central frame body or far away from the geometric center of the central frame body.
4. The lathe center rest capable of accurately adjusting the center according to claim 3, wherein: the sliding device is a synchronous movement device, the three telescopic rods retract into the sliding device, when the three supporting wheels stop at initial positions, the geometric centers of the three supporting wheels coincide with the geometric center of the central frame body, the three telescopic rods slide towards the central frame relative to the respective sliding devices, and the geometric centers of the three supporting wheels are kept to coincide with the geometric center of the central frame body at any time.
5. The lathe center rest capable of accurately adjusting the center according to claim 4, wherein: the synchronous movement device comprises a servo motor control unit, a gear rack transmission unit and a servo motor, wherein the servo motor control unit is connected with the servo motor, the servo motor drives a gear shaft to rotate, the gear is fixed with a gear shaft, the gear shaft is rotationally connected with a sliding device, a rack is fixed with a telescopic rod, and the rack is correspondingly meshed with the gear.
6. The lathe center rest capable of accurately adjusting the center according to claim 5, wherein: the servo motor is in transmission connection with the gear shaft through a speed reducer.
7. A precisely adjustable lathe center rest according to any one of claims 1-6, wherein: still include laser emission head, transmission pipe and laser receiving head, the laser emission head be used for with the headstock is fixed, the receiving head be used for install in on the tailstock and with the position of laser emission head corresponds for receive the reference laser of using of laser emission head transmission, the optical axis of the reference laser of using is parallel with the axis of main shaft, the transmission pipe is fixed on the centre frame body, just be used for transmitting the transmission light optical axis of laser on the transmission pipe with the optical axis coincidence of the reference laser of using.
8. The lathe center rest capable of accurately adjusting the center according to claim 7, wherein: the transmission tube comprises a tube barrel and two light-transmitting plates, the two light-transmitting plates are fixed with the inner wall of the tube barrel at intervals in the tube barrel, light-transmitting holes for transmitting reference laser are correspondingly arranged at the centers of the two light-transmitting plates respectively, and the two light-transmitting holes and the axis of the light of the transmission light are coincided in a collinear mode.
9. The lathe center rest capable of accurately adjusting the center according to claim 8, wherein: the laser emitting heads, the transmission tubes and the laser receiving heads are arranged in a collinear manner along the longitudinal direction and are correspondingly fixed with the spindle box, the center frame body and the tailstock, each pair of laser emitting heads, the transmission tubes and the laser receiving heads are transversely arranged in a collinear manner, and connecting lines of centers of each pair of laser emitting heads, the transmission tubes and the laser receiving heads are parallel to the central axis of the spindle.
10. The lathe center rest capable of accurately adjusting the center according to claim 9, wherein: the center frame is characterized by further comprising a vertical sliding seat, the vertical sliding seat is connected with the sliding table in a sliding mode in the vertical direction, and the center frame body is fixed with the vertical sliding seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221589886.4U CN218015813U (en) | 2022-06-23 | 2022-06-23 | Lathe center frame capable of accurately adjusting center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221589886.4U CN218015813U (en) | 2022-06-23 | 2022-06-23 | Lathe center frame capable of accurately adjusting center |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218015813U true CN218015813U (en) | 2022-12-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221589886.4U Active CN218015813U (en) | 2022-06-23 | 2022-06-23 | Lathe center frame capable of accurately adjusting center |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218015813U (en) |
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2022
- 2022-06-23 CN CN202221589886.4U patent/CN218015813U/en active Active
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Address after: Plant 102, No. 508, Huangpu East Ring Road, Huangpu Community, Xinqiao Street, Bao'an District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Shute Zhijie Machinery Co.,Ltd. Address before: Plant 102, No. 508, Huangpu East Ring Road, Huangpu Community, Xinqiao Street, Bao'an District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen Zhijie Machinery Equipment Co.,Ltd. |