CN210233922U - Screw extruder gear box assembly and screw extruder - Google Patents
Screw extruder gear box assembly and screw extruder Download PDFInfo
- Publication number
- CN210233922U CN210233922U CN201921115037.3U CN201921115037U CN210233922U CN 210233922 U CN210233922 U CN 210233922U CN 201921115037 U CN201921115037 U CN 201921115037U CN 210233922 U CN210233922 U CN 210233922U
- Authority
- CN
- China
- Prior art keywords
- screw
- hole
- screw extruder
- output shaft
- rear end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a screw extruder gear box subassembly and screw extruder. The gear box component of the screw extruder comprises a box body, a screw, a transition rod, an output shaft and an end cover component, wherein the front end of the screw is provided with a thrust spiral, and the rear end of the screw is a positioning neck; the transition rod is detachably connected to the rear end of the screw rod; the output shaft is arranged on the box body, a through hole is axially formed in the output shaft, the screw rod and the transition rod can penetrate into or penetrate out of the through hole from the rear end of the output shaft, the thrust screw can penetrate out of the front end of the through hole, and the positioning neck can be detachably connected to the hole wall of the through hole through a key; an end cap assembly is removably mounted to the rear end of the output shaft to axially locate the transition rod and the screw. The screw rod can penetrate the through-hole or take out from the through-hole from the rear end of output shaft, need not dismantle a large amount of auxiliary line equipment of feed inlet department of receiving material equipment, can dismantle transition pole and screw rod, the easy dismounting of screw rod in proper order moreover.
Description
Technical Field
The utility model relates to a screw extruder gear box subassembly and screw extruder.
Background
The screw extruder is a device widely applied in the plastic rubber industry, can fully plasticize and uniformly mix materials by means of pressure and shearing force generated by rotation of a screw, and is a key device influencing product quality.
The gearbox is the power transmission component of the screw extruder apparatus. The screw is a core part in the screw extruder and is a vulnerable part, a user needs to replace the screw every 1-2 years, and the screw is periodically disassembled to perform maintenance and repair on the screw in the period. The traditional screw extruder comprises the following steps of disassembling a screw: firstly, pins on a machine barrel of the screw extruder are disassembled, a material mixing inlet of a material receiving device in front of the machine barrel is opened, and then a jack is used for ejecting the screw forward from the back of a gear box. In order to meet a certain amount of disassembly space, a large amount of auxiliary line equipment at the outlet end of the screw extruder, such as a film cooling system and the like, is required to be disassembled, so that time and labor are wasted; and because the screw rod is longer and heavier, need use large-scale hoisting equipment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a screw extruder gear box subassembly and screw extruder that can alleviate the work load when maintaining the screw rod.
To achieve the purpose, on one hand, the utility model adopts the following technical scheme:
a screw extruder gearbox assembly comprising:
a box body;
the front end of the screw is provided with a thrust spiral, and the rear end of the screw is provided with a positioning neck;
a transition rod detachably connected to a rear end of the screw;
the output shaft is arranged on the box body, a through hole is axially formed in the output shaft, the screw rod and the transition rod can penetrate into or penetrate out of the through hole from the rear end of the output shaft, the thrust screw can penetrate out of the front end of the through hole, and the positioning neck can be detachably connected to the hole wall of the through hole through a key;
an end cap assembly removably mounted to the rear end of the output shaft to axially locate the transition rod and the threaded rod.
In one embodiment, a washer is disposed between the transition rod and the rear end of the threaded rod.
In a specific embodiment, an inner hole shoulder is arranged on the inner wall of the through hole, and an outer wall shoulder is arranged on the outer wall of the transition rod and used for axially positioning the outer wall shoulder.
In a specific embodiment, the transition rod is a hollow structure with two open ends, an installation part is arranged on the inner wall of the transition rod, and a bolt penetrates through the installation part to be connected with the rear end of the screw rod.
In a specific embodiment, an internal thread is provided on the hole wall at the rear end of the through hole, the end cover assembly comprises a threaded sleeve and a rear cover, the threaded sleeve is in threaded connection with the internal thread at the rear end of the through hole, and the rear cover is connected to the rear end of the threaded sleeve.
In a specific embodiment, a first stop groove is formed in the rear cover, a second stop groove is formed in a corresponding position of the output shaft, and a stop block is clamped in the first stop groove and the second stop groove.
In a specific embodiment, a joint is arranged on the rear cover, the joint is in threaded connection with the rear cover, a water inlet and a water return port are arranged on the joint, the water inlet is communicated with a water inlet pipe on the circulating water channel on the screw rod through a water inlet pipe, and the water return port is communicated with the circulating water channel on the screw rod through a water return pipe; the water inlet pipe is arranged in the water return pipe in a penetrating mode, or the water return pipe is arranged in the water inlet pipe in a penetrating mode.
In a specific embodiment, the outer wall of the positioning neck is connected with a flat key, and the wall of the through hole is correspondingly provided with a flat key groove for accommodating the flat key.
In a specific embodiment, a helical gear is arranged on the outer wall of the output shaft, two ends of the output shaft are respectively supported on the box body through a self-aligning bearing, the middle part of the output shaft is supported on the box body through a thrust bearing, and the helical gear provides axial pretightening force for the thrust bearing when rotating.
On the other hand, the utility model adopts the following technical scheme:
a screw extruder comprising a screw extruder gearbox assembly as defined in any one of the preceding claims.
The utility model has the advantages as follows:
the utility model provides a screw extruder gear box subassembly and screw extruder after dismantling the end cover subassembly, can penetrate the screw rod into the through-hole or take out from the through-hole from the rear end of screw rod output shaft, need not to dismantle a large amount of auxiliary line equipment of receiving material equipment's feed inlet department, and the dismouting of screw rod is more convenient; and because be provided with the transition pole between screw rod and the end cover subassembly, the screw rod descends for the length and the weight of screw rod among the prior art, can dismantle transition pole and screw rod in proper order, has further simplified the dismouting of screw rod.
Drawings
FIG. 1 is a schematic structural view of a screw extruder according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a screw extruder gearbox assembly according to an embodiment of the present invention;
FIG. 3 is a partial enlarged view of the portion A in FIG. 2
Fig. 4 is a schematic structural diagram of an output shaft according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
fig. 6 is a top view along fig. 4.
Reference numerals:
100. a gear case; 200. a screw; 300. a barrel; 400. a feed inlet of the receiving equipment; 500. an auxiliary line device; 210. pushing spiral; 220. a positioning neck;
101. a box body; 102. an input shaft; 103. a primary reduction gear shaft; 104. a primary reduction gear; 105. a secondary reduction gear shaft; 106. a secondary reduction gear; 107. an output shaft; 108. an output gear; 109. a self-aligning bearing; 110. a thrust bearing; 111. a feeding gear; 112. a speed ratio gear; 113. a transition rod; 115. a through hole; 116. a key; 117. a gasket; 118. an installation part; 119. a bolt; 120. a water inlet sleeve;
1141. a threaded sleeve; 1142. a rear cover; 1143. a first stopper groove; 1144. a second detent groove; 1145. a stopper block; 1146. a joint; 1147. a water inlet pipe, 1148, a water return pipe;
1151. a keyway; 1152. an inner bore shoulder; 1153. an internal thread.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
One embodiment of the present invention provides a screw extruder, preferably a single screw extruder. As shown in fig. 1, the screw extruder includes a screw extruder gearbox assembly including a gearbox 100 and a screw 200. The discharge gate of screw extruder gear box subassembly is located receiving equipment's feed inlet 400 department to for receiving equipment's feed inlet 400 feed. The number of screw extruder gear box assemblies is selected according to the number of the types of raw materials required by the material receiving equipment, for example, when only one raw material is needed, one set of screw extruder gear box assembly is arranged at the feed inlet 400 of the material receiving equipment, and when at least two raw materials are needed, at least two sets of screw extruder gear box assemblies can be arranged at the feed inlet 400 of the material receiving equipment.
As shown in fig. 2, the gear box 100 includes a box body 101, and an input shaft 102, at least one reduction gear shaft, and an output shaft 107 are disposed in parallel on the box body 101. In this embodiment, two reduction gear shafts are taken as an example for description, the two reduction gear shafts are respectively the primary reduction gear shaft 103 and the secondary reduction gear shaft 105, but of course, one or more reduction gear shafts may be adopted in other embodiments. The input shaft 102, the primary reduction gear shaft 103, the secondary reduction gear shaft 105, and the output shaft 107 are supported by the housing 101 through bearings, respectively, and the input shaft 102 is connected to the screw 200. Specifically, a primary reduction gear 104 is provided on the primary reduction gear shaft 103, a secondary reduction gear 106 is provided on the secondary reduction gear shaft 105, and an output gear 108 is provided on the output shaft 107. The primary reduction gear 104, the secondary reduction gear 106, and the output gear 108 may each be, but are not limited to being, fixedly coupled to their respective shafts by keys. The input shaft 102 is meshed with a primary reduction gear 104, the primary reduction gear shaft 103 is meshed with a secondary reduction gear 106, and the secondary reduction gear shaft 105 is meshed with an output gear 108. The input shaft 102 drives the output shaft 107 and the screw 200 to rotate through the reduction gear shafts and the reduction gears of the respective stages.
Optionally, the output gear 108 is a helical gear, two ends of the output shaft 107 are respectively supported on the box 101 through a self-aligning bearing 109, the middle of the output shaft 107 is supported on the box 101 through a thrust bearing 110, the self-aligning bearing 109 and the thrust bearing 110 are preferably but not limited to roller bearings, and the middle thrust bearing 110 does not play a supporting role and is only used for bearing the axial thrust of the screw 200. The helical gear is located between the thrust bearing 110 and the self-aligning bearing 109 at the rear end of the output shaft 107, and the axial force provided by the helical gear in operation is directed to the self-aligning bearing 109 at the rear end of the output shaft 107 to provide an axial pre-tightening force for the thrust bearing 110.
The front end of the output shaft 107 is also preferably, but not limited to, provided with a feeding gear 111 integrated with the output shaft 107, and concentricity of the axis of the feeding gear 111 and the axis of the output shaft 107 can be ensured. The feeding gear 111 is engaged with the ratio gear 112 to effect feeding.
In order to solve the problem of difficulty in disassembling the screw 200 in the prior art, please refer to fig. 2 to 5, a thrust spiral 210 is disposed at the front end of the screw 200, a positioning neck 220 is disposed at the rear end of the screw 200, the outer diameter of the thrust spiral 210 is smaller than the outer diameter of the positioning neck 220, and a transition rod 113 is detachably connected to the rear end of the screw 200. The transition bar 113 is preferably, but not limited to, a hollow structure with both ends open to reduce weight and facilitate installation of other components. The output shaft 107 is provided with a through hole 115 along the axial direction, the screw rod 200 and the transition rod 113 can penetrate into the through hole 115 or be drawn out from the through hole 115 from the rear end of the output shaft 107, the thrust screw 210 can penetrate out from the front end of the through hole 115, the positioning neck 220 can be detachably connected to the hole wall of the through hole 115 through the key 116, and the end cover assembly is detachably mounted at the rear end of the output shaft 107 to support the transition rod 113 and axially position the transition rod 113 and the screw rod 200.
Optionally, a key 116 is circumferentially attached to the outer wall of the retaining neck 220. The number of the keys 116 is preferably, but not limited to, at least two, and the keys 116 are preferably, but not limited to, uniformly arranged in the circumferential direction. The key 116 is preferably, but not limited to, a flat key. The key 116 is preferably, but not limited to, removably attached to the retaining neck 220 by a bolted 119 connection or the like. The inner wall of the through hole 115 is correspondingly provided with a key groove 1151 for accommodating the key 116, the key 116 and the key groove 1151 are both arranged along the axial direction, the front end of the key groove 1151 is provided with a groove wall for axially positioning the front end of the key 116, so that the thrust spiral 210 can penetrate out from the front end of the through hole 115, meanwhile, the output shaft 107 and the positioning neck 220 are connected through the key 116, so that the positioning neck 220 can be axially positioned, the structure is simple, the processing is convenient, the key groove 1151 plays a role in axially positioning the screw rod 200, can effectively transmit torque and ensure the concentricity of the screw rod 200 and the output shaft 107.
In the gear box assembly of the screw extruder provided by the embodiment, after the end cover assembly is disassembled, the screw 200 can penetrate into the through hole 115 from the rear end of the output shaft 107 and the screw 200 can be pulled out from the output shaft 107 from the through hole 115, a large amount of auxiliary line equipment 500 at the positions of the machine barrel 300 and the feed inlet 400 of the material receiving equipment does not need to be disassembled, and the screw 200 is more convenient to disassemble and assemble; moreover, the transition rod 113 is arranged between the screw rod 200 and the end cover assembly, so that the length and the weight of the screw rod 200 are reduced compared with those of the screw rod 200 in the prior art, the transition rod 113 and the screw rod 200 can be sequentially disassembled, and the disassembly and the assembly of the screw rod 200 are further simplified.
As shown in fig. 3, a washer 117 is disposed between the transition rod 113 and the rear end of the screw 200. The axial positioning of the screw 200 can be ensured by selecting washers 117 of different thicknesses. An inner hole shoulder 1152 is arranged on the inner wall of the through hole 115, an outer wall shoulder is arranged on the outer wall of the transition rod 113, and the inner hole shoulder 1152 is used for axially positioning the outer wall shoulder, so that the transition rod 113 and the screw rod 200 are axially positioned. The detachable connection between the transition rod 113 and the screw rod 200 is not limited, for example, an installation portion 118 is disposed on an inner wall of the transition rod 113, and the bolt 119 passes through the installation portion 118 and is connected to the rear end of the screw rod 200.
As shown in fig. 2 and 4, an internal thread 1153 is provided on the hole wall at the rear end of the through hole 115, the end cap assembly includes a threaded sleeve 1141 and a rear cap 1142, the threaded sleeve 1141 is a hollow structure with openings at both ends, an external thread matching with the internal thread 1153 is provided on the outer wall of the threaded sleeve 1141, the thread of the threaded sleeve 1141 is connected to the rear end of the through hole 115 through the internal thread 1153 and the external thread, and the rear cap 1142 is connected to the rear end of the threaded sleeve 1141 to cover the rear end of the threaded sleeve 1141. The internal threads 1153 and external threads are preferably, but not limited to, trapezoidal threads. The threaded sleeve 1141 is in threaded connection with the output shaft 107, and the transmission between the screw rod 200 and the output shaft 107 is more stable and reliable.
The mounting manner of the rear cover 1142 is not limited, and the rear cover 1142 is coupled to the threaded sleeve 1141 by bolts 119, for example. The rear cover 1142 is provided with a first stop groove 1143, the output shaft 107 is provided with a second stop groove 1144 at a corresponding position, and the stop block 1145 is clamped in the first stop groove 1143 and the second stop groove 1144 to further prevent the relative rotation between the threaded sleeve 1141 and the output shaft 107.
As shown in fig. 2 and 4, a joint 1146 is disposed on the rear cover 1142, the joint 1146 is screwed on the rear cover 1142, a water inlet and a water return opening are disposed on the joint 1146, the water inlet is communicated with a water inlet pipe 1147, the water return opening is communicated with a water return pipe 1148, the water inlet pipe 1147 and the water return pipe 1148 are respectively communicated with the circulation water channel on the screw 200, and the water inlet pipe 1147 is inserted into the water return pipe 1148. The return pipe 1148 and the rear cover 1142 may be, but not limited to, connected by a screw. In order to ensure the sealing performance, the rear end of the screw rod 200 is provided with a water inlet sleeve 120, and one end of the water return pipe 1148 is inserted into the water inlet sleeve 120. The water inlet sleeve 120 and the screw rod 200 are preferably, but not limited to, threaded. A sealing ring is preferably, but not limited to, disposed between the water inlet sleeve 120 and the screw rod 200. A sealing ring is preferably, but not limited to, arranged between the water inlet sleeve 120 and the water return sleeve.
In other modes, the positions of the water inlet pipe 1147 and the water return pipe 1148 may be exchanged, that is, the water return pipe 1148 is inserted into the water inlet pipe 1147, and the water inlet pipe 1147 is connected to the rear cover 1142 by a screw thread.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A screw extruder gearbox assembly, comprising:
a box body (101);
the front end of the screw rod (200) is provided with a thrust spiral (210), and the rear end of the screw rod is provided with a positioning neck (220);
a transition rod (113) detachably connected to a rear end of the screw (200);
the output shaft (107) is arranged on the box body (101) and is provided with a through hole (115) along the axial direction, the screw (200) and the transition rod (113) can penetrate into or penetrate out of the through hole (115) from the rear end of the output shaft (107), the thrust screw (210) can penetrate out from the front end of the through hole (115), and the positioning neck (220) can be detachably connected to the hole wall of the through hole (115) through a key (116);
an end cap assembly removably mounted to a rear end of the output shaft (107) to axially locate the transition rod (113) and the screw (200).
2. The screw extruder gearbox assembly of claim 1,
and a gasket (117) is arranged between the transition rod (113) and the rear end of the screw rod (200).
3. The screw extruder gearbox assembly of claim 2,
an inner hole shaft shoulder (1152) is arranged on the inner wall of the through hole (115), an outer wall shaft shoulder is arranged on the outer wall of the transition rod (113), and the inner hole shaft shoulder (1152) is used for axially positioning the outer wall shaft shoulder.
4. The screw extruder gearbox assembly of claim 1,
transition pole (113) are both ends open-ended hollow structure, be provided with installation department (118) on the inner wall of transition pole (113), bolt (119) pass installation department (118) with the rear end of screw rod (200) is connected.
5. The screw extruder gearbox assembly of claim 1,
be provided with internal thread (1153) on the pore wall of through-hole (115) rear end, the end cover subassembly includes threaded sleeve (1141) and back lid (1142), threaded sleeve (1141) threaded connection in through-hole (115) rear end, back lid (1142) are connected on the rear end of threaded sleeve (1141).
6. The screw extruder gearbox assembly according to claim 5, wherein the rear cover (1142) is provided with a first stop groove (1143), the output shaft (107) is provided with a second stop groove (1144) at a corresponding position, and the stop block (1145) is clamped in the first stop groove (1143) and the second stop groove (1144).
7. The screw extruder gearbox assembly of claim 5,
a joint (1146) is arranged on the rear cover (1142), the joint (1146) is in threaded connection with the rear cover (1142), a water inlet and a water return port are arranged on the joint (1146), the water inlet is communicated with a circulating water channel on the screw rod (200) through a water inlet pipe (1147), and the water return port is communicated with the circulating water channel on the screw rod (200) through a water return pipe (1148); the water inlet pipe (1147) penetrates through the water return pipe (1148), or the water return pipe (1148) penetrates through the water inlet pipe (1147).
8. Screw extruder gearbox assembly according to any one of claims 1 to 7,
the outer wall of the positioning neck (220) is connected with a flat key, and a flat key groove used for containing the flat key is correspondingly arranged on the hole wall of the through hole (115).
9. Screw extruder gearbox assembly according to any one of claims 1 to 7,
the outer wall of the output shaft (107) is provided with a helical gear, two ends of the output shaft (107) are supported on the box body (101) through self-aligning bearings (109), the middle part of the output shaft (107) is supported on the box body (101) through a thrust bearing (110), and the helical gear provides axial pretightening force for the thrust bearing (110) when rotating.
10. Screw extruder, characterized in that it comprises a screw extruder gearbox assembly according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921115037.3U CN210233922U (en) | 2019-07-16 | 2019-07-16 | Screw extruder gear box assembly and screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921115037.3U CN210233922U (en) | 2019-07-16 | 2019-07-16 | Screw extruder gear box assembly and screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210233922U true CN210233922U (en) | 2020-04-03 |
Family
ID=69991281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921115037.3U Active CN210233922U (en) | 2019-07-16 | 2019-07-16 | Screw extruder gear box assembly and screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210233922U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110271163A (en) * | 2019-07-16 | 2019-09-24 | 南京宁嘉机电有限公司 | Screw extruder gear case assembly and screw extruder |
-
2019
- 2019-07-16 CN CN201921115037.3U patent/CN210233922U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110271163A (en) * | 2019-07-16 | 2019-09-24 | 南京宁嘉机电有限公司 | Screw extruder gear case assembly and screw extruder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210233922U (en) | Screw extruder gear box assembly and screw extruder | |
| CN105673818B (en) | Single screw extrusion machine main-gear box assembly and its application | |
| CN114988559A (en) | Environment-friendly chemical industry is aeration equipment for sewage treatment | |
| CN110271163A (en) | Screw extruder gear case assembly and screw extruder | |
| CN204746314U (en) | A equipment for retort stirring | |
| CN110694508A (en) | Position automatic adjustment double-stirring device | |
| CN203239885U (en) | Gear case for plastic extruding machine | |
| CN109317020A (en) | A kind of ice-covering-proof coatings Preparation equipment | |
| CN202377562U (en) | Multi-hole gang drill tool | |
| CN108927997A (en) | A kind of 3D printing nozzle component | |
| CN201922226U (en) | Disassembling device for main shaft of switch machine | |
| CN203685894U (en) | Device capable of rapidly replacing coupling | |
| CN108772018B (en) | Coating mixing device for high-barrier coating material coating device | |
| CN110318666A (en) | A kind of engineering machinery drilling mechanism | |
| CN214982020U (en) | Horizontal concrete mixer | |
| CN116870775B (en) | Pulping machine | |
| CN212795376U (en) | Cement pipe mould easy to assemble or disassemble | |
| CN213691146U (en) | Pharmacy is with synthesizing real device of instructing convenient to dismouting | |
| CN205618641U (en) | Single screw extruder owner gear box assembly | |
| CN220396414U (en) | Extrusion equipment speed reducer output connection structure | |
| CN220129490U (en) | Hollow blow molding machine hank material mechanism and blow molding machine | |
| CN220546845U (en) | Mixing equipment for soap powder production | |
| CN212040244U (en) | Mixer convenient to flabellum is dismantled in installation | |
| CN217633672U (en) | Take anti-vibration gear reducer of strengthening rib structure | |
| CN209255666U (en) | A kind of feeding efficiently stock shelf |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200519 Address after: 210012 Xijing Road, Airport Industrial Park, Jiangning Economic and Technological Development Zone, Nanjing City, Jiangsu Province Patentee after: NANJING HIGH-SPEED & ACCURATE GEAR GROUP Co.,Ltd. Address before: Airport Industrial Park in Jiangsu province Nanjing City Xijing road 211153 Jiangning economic and Technological Development Zone Co-patentee before: Nanjing High Precision Transmission Equipment Manufacturing Group Co., Ltd. Patentee before: NANJING NINGJIA ELECTROMECHANICAL Co.,Ltd. |