CN205036557U - Levogyration female screw rod axle of inside multislot that metal level was filled - Google Patents
Levogyration female screw rod axle of inside multislot that metal level was filled Download PDFInfo
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- CN205036557U CN205036557U CN201520569550.5U CN201520569550U CN205036557U CN 205036557 U CN205036557 U CN 205036557U CN 201520569550 U CN201520569550 U CN 201520569550U CN 205036557 U CN205036557 U CN 205036557U
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Abstract
The utility model provides a levogyration female screw rod axle of inside multislot that metal level was filled, technology is complicated when solving prior art processing screw shaft, the processing degree of difficulty is big, especially relates to the inside epaxial many thin sheet part stack that has an above groove formation mating surface, and thin sheet part is the spot welding levogyration female screw rod axle connecting and have the metal level to fill each other includes thin sheet part, axle, characterized by: thin sheet part's gabarit shape is the cross -section gabarit shape of levogyration female screw rod axle engaging piece, has the protruding hole of the convex parallel key of more than one profile of tooth shape tooth in thin sheet part's the shaft hole, and there is a laevorotary helical shape recess more than the outside in the middle section of axle, and the intussuseption of mutual clearance is filled with the metal level between axle and the multi -disc thin sheet part, form continuous left -hand teeth after the stack of multi -disc thin sheet part at the bottom of mating surface left -hand teeth push up the mating surface, reach the low cost, make the technological purpose of high physical properties screw shaft fast.
Description
Technical field
The utility model relates to the left-handed female screw axle of the inside multiple-grooved that a kind of metal layer is filled, particularly relate to and a kind of inner axle has many sheet parts superpositions of one or more groove form Surface of action, sheet parts each other spot welding connects and the left-handed female screw axle having metal layer to fill.
Background technique
Helical-lobe compressor, also screw compressor is claimed, comprise screw air compressor and screw rod technique compressor (vinyl chloride compressor etc.), helical-lobe compressor is divided into single screw compressor and double-screw compressor, and helical-lobe compressor utilizes screw axis shape rotor to compress and fed sheet of a media do rotation motion in cylinder body.
It is high that helical-lobe compressor has reliability, and component are few, do not have easily damaged parts, and thus its running is reliable, and the life-span is long, and general screw machine host header reaches 30 years projected life; Convenient operating maintenance, automaticity is high, and operator, without the need to through long-time professional training, realize unmanned running; Dynamical balancing is good, does not have unbalance inertia force, and machine can high speed operation reposefully, realizes foundation-free running; Strong adaptability, has the advantages that to force gas transmission, and volume flow is hardly by the impact of exhaust pressure, higher efficiency can be kept in the condition range of broadness, when compressor arrangement without any changes, be applicable to various working, thus be easy to sizing batch production; Multi-phase mixed delivering, in fact leaves gap between the rotor flank of tooth, thus ability hydraulic shock, can force feed containing the gas of liquid, containing dusty gas, easy polymerizable gas etc.; Guiding valve Flow-rate adjustment, do not need to return stream, can effectively reduce the advantages such as energy consumption, therefore, helical-lobe compressor is widely used.
The subject matter that current containment helical-lobe compressor develops is that the cost of helical-lobe compressor is high, the flank of tooth due to the screw axis rotor of screw machine is a space curved surface, the outer contour in its cross section is formed by connecting by the curve of multiple complexity, the curved surface of the flank of tooth of overall screw axis rotor is formed through spiral stretch by the external frame of above-mentioned complex curve, the flank of tooth of screw axis rotor is the curved surface of a complicated stereoscopic three-dimensional, therefore, turning common in machining and milling device not competent, numerical control turning general at present and milling device can not be processed, need to utilize special cutter to process on expensive special device in machining.
The processing of screw axis rotor, divides from product material, is generally divided into foundry goods cutting and forged steel pieces cutting.
The screw axis rotor that foundry goods cutting is shaped, necessary first cast form, then with machining center and dedicated tool cutting, the screw axis rotor that the quality such as rigid, wear resistance of product is cut relative to forged steel pieces is weaker.
During the screw axis rotor machining that forged steel pieces cuts, must first by steel formed by forging, then with machining center and dedicated tool repeatedly cutting, Quenching Treatment and surface finishing is carried out again after shaping, therefore, technological requirement is high, technological process is complicated, processing speed is slow, cost of production is high.
In actual production, production enterprise often adopts import machining center and import cutter to complete processing, and enterprise is when purchasing high-end import machining center, and be subject to the technology restriction of developed country, meanwhile, import equipment and import cutter substantially increase cost of production.
Summary of the invention
The technical problem that the utility model solves is: complex process during in order to solve prior art processing screw axis, long processing time, difficulty of processing are large, processing cost high-technology defect, a kind of screw axis is provided, particularly relate to and a kind of inner axle has many sheet parts superpositions of one or more groove form Surface of action, sheet parts each other spot welding connects and the left-handed female screw axle having metal layer to fill, and reaches low cost, manufactures the technical purpose of high physical property screw axis fast.
The technological scheme of the utility model technical solution problem is:
In order to achieve the above object, the left-handed female screw axle of the inside multiple-grooved that a kind of metal layer that the utility model provides is filled, comprises sheet parts, axle, it is characterized in that:
The outline shape of described sheet parts is the cross section outline shape of left-handed female screw axle engaging piece, and there is engaging piece at the bottom of the tooth concaved the outside of sheet parts, and has cambered outwards tooth top engaging piece;
Axis hole is had, the key shape tooth projecting apertures that in axis hole, more than one profile of tooth is protruded in described sheet parts;
The spiral groove that the outside in the stage casing of described axle has one or more left-handed;
The quantity that profile of tooth in described sheet parts axis hole is protruded is identical with the described quantity of the groove of the external helicoid shape of axle, and cooperatively interacts;
The cover that the outside in the stage casing of described axle is closely orderly has multi-disc sheet parts;
Relative position between described axle and multi-disc sheet parts is fixed;
Connect with spot welding between described multi-disc sheet parts, the soldering point at least two of adjacent two panels sheet parts;
Metal layer is filled with in gap mutual between described axle and multi-disc sheet parts, form Surface of action at the bottom of continuous print left-hand teeth after engaging piece superposition at the bottom of the tooth of multi-disc sheet parts, after the tooth top engaging piece superposition of multi-disc sheet parts, form the left-handed tooth top Surface of action of continuous print.
Be more preferably the metal layer left-handed female screw axle of inside multiple-grooved of filling, it is characterized in that: metal layer is selected from following any one: lead layer, tin layers, layers of copper, aluminium lamination.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, it is characterized in that: in described sheet parts, have axis hole, have the key shape tooth projecting apertures that six profiles of tooth are protruded in axis hole, there are six left-handed spiral grooves the outside in the stage casing of described axle.
A kind of process step of screw axis is as follows:
Step 1): sheet metal is machined into sheet parts;
Step 2): the outside then multi-disc sheet parts being enclosed within axle, the tooth in sheet parts axis hole is convex to cooperatively interact with the groove of the external helicoid shape of axle, forms the appearance of spiral oblique crank Z;
Step 3): the relative position then the multi-disc sheet parts of the spiral oblique crank Z after above-mentioned moulding and axle being carried out profile is fixed, and forms screw rod axis body after fixing;
Step 4): carry out the inspection of semifinished product to described screw rod axis body, qualified screw rod axis body enters next step, and defective screw rod axis body is again checked after entering the mould squeezing shaping of screw axis shape, entered next step after qualified;
Step 5): then by the surperficial prefluxing of above-mentioned screw rod axis body;
Step 6): then at the outer matel coated powder of soldering flux, metal powder is filled between each sheet parts;
Step 7): then the screw rod axis body scribbling metal powder is carried out quenching technical, while quenching technical, screw axis surface is sintered into one, and forms the screw axis of the sintering of quenching;
Step 8): then the screw axis of above-mentioned thermal sintering is carried out Checking of finished products, qualified finished product screw axis warehouse-in, defective screw axis is checked after carrying out the outer contour surface process of screw axis again, the finished product screw axis warehouse-in after qualified.
The another kind of process step of screw axis is as follows:
Step 1): sheet metal is machined into toothed sheet parts;
Step 2): the outside then multi-disc sheet parts being enclosed within axle, the tooth in sheet parts axis hole is convex to cooperatively interact with the groove of the external helicoid shape of axle, forms the appearance of spiral oblique crank Z;
Step 3): the relative position then the multi-disc sheet parts of the spiral oblique crank Z after above-mentioned moulding and axle being carried out profile is fixed, and forms screw rod axis body after fixing;
Step 4): carry out the inspection of semifinished product to described screw rod axis body, qualified screw rod axis body enters next step, and defective screw rod axis body is again checked after entering the mould squeezing shaping of screw axis shape, entered next step after qualified;
Step 5): then screw rod axis body is put into hardening furnace and heat;
Step 6): then by the surperficial prefluxing of screw rod axis body after above-mentioned heating;
Step 7): the screw rod axis body then surface being coated with fluxing agent immerses metallic solution;
Step 8): then screw rod axis body is taken out from metallic solution, carry out quench cooling technique;
Step 9): then above-mentioned screw rod axis body after quench cooling is carried out Checking of finished products, qualified finished product screw axis warehouse-in, defective screw rod axis body is checked after carrying out the outer contour surface process of screw axis again, the finished product screw axis warehouse-in after qualified.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, adopts wherein a kind of method of punching press, Linear cut, laser beam cutting, plasma cut, the cutting of high pressure liquid muscle power, sheet metal is processed into sheet parts.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, the metal powder that soldering flux is coated with outward is lead powder, glass putty, copper powder, copper alloy powder, terne metal powder.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, completes screw rod axis body quenching technical in vacuum box.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, wherein a kind of method that quenching technical adopts high frequency hardening, mid frequency induction hardening or heat treatment furnace to quench.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, when quenching in vacuum box, close vacuum pump, open suction valve fast, make air inlet fast in vacuum box, by the time, when vacuum box internal pressure and normal-pressure balance, cut out suction valve reopens vacuum pump and carries out negative-pressure ward, and above-mentioned rapid pressure and fast decompression process hocket once.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, the method that the described relative position multi-disc sheet parts of the spiral oblique crank Z after moulding and axle being carried out profile is fixed is: adopt auxiliary clamp, axial grip sheet parts while clamp shaft, and fixing relative position.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, adopts wherein a kind of method of punching press, Linear cut, laser beam cutting, plasma cut, the cutting of high pressure liquid muscle power, sheet metal is processed into sheet parts.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, the metal powder that soldering flux is coated with outward is lead powder, glass putty, copper powder, copper alloy powder, terne metal powder.
A left-handed female screw axle for the inside multiple-grooved that the metal layer be more preferably is filled, the metallic solution that screw axis immerses is plumbous liquid, tin liquor, copper liquid, copper alloy liquid, terne metal liquid.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, immerse in metallic solution manufacturing process at vacuum box inner screw axis body, close vacuum pump, open suction valve fast, make air inlet fast in vacuum box, by the time, when vacuum box internal pressure and normal-pressure balance, cut out suction valve reopens vacuum pump and carries out negative-pressure ward, and above-mentioned rapid pressure and fast decompression process hocket once.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, the method that the described relative position multi-disc sheet parts of the spiral oblique crank Z after moulding and axle being carried out profile is fixed is: with axial force clamping sheet parts on axle, and fixing relative position.
Compare with current screw axis processing technique, the Advantageous Effects that the utility model obtains is: save technological process, simplified processing process, shorten process time, the metal layer of filling is flexible metallic material, after stressed extruding, flexible metal can be extruded from the flank of tooth or remove, do not affect tooth face hardness and flank of tooth physical parameter, reduce difficulty of processing, reach low cost, the technical purpose of the high physical property screw axis of quick manufacture, solve prior art processing screw axis time complex process, long processing time, difficulty of processing is large, processing cost high-technology defect, vacuum state can discharge the gas in metallic solution, when carrying out quenching technical in vacuum box, rapid pressure and fast decompression process hocket, granulated metal is made in screw rod axis body, to produce motion after liquefaction, accelerate air in screw rod axis body to discharge, make in screw rod axis body finer and close, improve screw rod axis body mechanical property, and produce the more outstanding above-mentioned technological deficiency of large-scale screw axis, the utility model simplified processing process, shorten process time, reduce difficulty of processing, reach low cost, the technical purpose of the high physical property screw axis of quick manufacture, solve prior art processing screw axis time complex process, long processing time, difficulty of processing is large, processing cost high-technology defect, and the above-mentioned technological deficiency of more giving prominence to when producing large-scale screw axis, practicability is large.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1: be schematic diagram of the present utility model.
Fig. 2: be the utility model sheet parts schematic diagram.
Fig. 3: be the utility model left-handed female screw axle schematic diagram.
In figure: 1. sheet parts, 2. axle, 3. left-handed spiral groove, 4. engaging piece at the bottom of tooth, 5. tooth top engaging piece, 6. key shape tooth projecting apertures.
Embodiment
Below in conjunction with specific embodiment, the utility model is described further, but the protection domain required by the utility model is not limited to the scope described by specific embodiment.
Example 1: as shown in Figure 1 to Figure 3, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, comprises sheet parts 1, axle 2, it is characterized in that:
The outline shape of described sheet parts 1 is the cross section outline shape of left-handed female screw axle engaging piece, and there is engaging piece 4 at the bottom of the tooth concaved the outside of sheet parts 1, and has cambered outwards tooth top engaging piece 5;
Axis hole is had, the key shape tooth projecting apertures 6 that in axis hole, more than one profile of tooth is protruded in described sheet parts 1;
The spiral groove 3 that the outside in the stage casing of described axle 2 has one or more left-handed;
The quantity that profile of tooth in described sheet parts 1 axis hole is protruded is identical with the described quantity of the groove of the external helicoid shape of axle 2, and cooperatively interacts;
The cover that the outside in the stage casing of described axle 2 is closely orderly has multi-disc sheet parts 1;
Relative position between described axle 2 and multi-disc sheet parts 1 is fixed;
Between described multi-disc sheet parts, 1 connects with spot welding, the soldering point at least two of adjacent two panels sheet parts 1;
Metal layer is filled with in gap mutual between described axle 2 and multi-disc sheet parts 1, engaging piece 4 at the bottom of the tooth of multi-disc sheet parts 1 superposes Surface of action at the bottom of rear formation continuous print left-hand teeth, and the tooth top engaging piece 5 of multi-disc sheet parts 1 superposes the left-handed tooth top Surface of action of rear formation continuous print.
A left-handed female screw axle for the inside multiple-grooved that the metal layer that is more preferably is filled, is characterized in that: metal layer is selected from following any one: lead layer, tin layers, layers of copper, aluminium lamination.
The left-handed female screw axle of the inside multiple-grooved that a kind of metal layer be more preferably is filled, it is characterized in that: in described sheet parts 1, have axis hole, have the key shape tooth projecting apertures 6 that six profiles of tooth are protruded in axis hole, there are six left-handed spiral grooves 3 outside in the stage casing of described axle 2.
Screw axis process step is as follows:
Step 1): sheet metal is machined into sheet parts 1;
Step 2): the outside then multi-disc sheet parts 1 being enclosed within axle 2, the tooth in sheet parts 1 axis hole is convex to cooperatively interact with the groove of the external helicoid shape of axle 2, forms the appearance of spiral oblique crank Z;
Step 3): then the relative position that the multi-disc sheet parts 1 of the spiral oblique crank Z after above-mentioned moulding and axle 2 carry out profile is fixed, after fixing, form screw rod axis body;
Step 4): carry out the inspection of semifinished product to described screw rod axis body, qualified screw rod axis body enters next step, and defective screw rod axis body is again checked after entering the mould squeezing shaping of screw axis shape, entered next step after qualified;
Step 5): then by the surperficial prefluxing of above-mentioned screw rod axis body;
Step 6): then at the outer matel coated powder of soldering flux, metal powder is filled between each sheet parts 1;
Step 7): then the screw rod axis body scribbling metal powder is carried out quenching technical, while quenching technical, screw axis surface is sintered into one, and forms the screw axis of the sintering of quenching;
Step 8): then the screw axis of above-mentioned thermal sintering is carried out Checking of finished products, qualified finished product screw axis warehouse-in, defective screw axis is checked after carrying out the outer contour surface process of screw axis again, the finished product screw axis warehouse-in after qualified.
Example 2: the structure of screw axis is identical with example 1, the another kind of process step of screw axis is as follows:
Step 1): sheet metal is machined into toothed sheet parts 1;
Step 2): the outside then multi-disc sheet parts 1 being enclosed within axle 2, the tooth in sheet parts 1 axis hole is convex to cooperatively interact with the groove of the external helicoid shape of axle 2, forms the appearance of spiral oblique crank Z;
Step 3): the relative position then the multi-disc sheet parts 1 of the spiral oblique crank Z after above-mentioned moulding and axle being carried out profile is fixed, and forms screw rod axis body after fixing;
Step 4): carry out the inspection of semifinished product to described screw rod axis body, qualified screw rod axis body enters next step, and defective screw rod axis body is again checked after entering the mould squeezing shaping of screw axis shape, entered next step after qualified;
Step 5): then screw rod axis body is put into hardening furnace and heat;
Step 6): then by the surperficial prefluxing of screw rod axis body after above-mentioned heating;
Step 7): the screw rod axis body then surface being coated with fluxing agent immerses metallic solution;
Step 8): then screw rod axis body is taken out from metallic solution, carry out quench cooling technique;
Step 9): then above-mentioned screw rod axis body after quench cooling is carried out Checking of finished products, qualified finished product screw axis warehouse-in, defective screw rod axis body is checked after carrying out the outer contour surface process of screw axis again, the finished product screw axis warehouse-in after qualified.
Example 3: as shown in Fig. 1 to Fig. 3 and example 1 or example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, adopt wherein a kind of method of punching press, Linear cut, laser beam cutting, plasma cut, the cutting of high pressure liquid muscle power, sheet metal is processed into sheet parts 1.
Example 4: as shown in Fig. 1 to Fig. 3 and example 1, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, the metal powder that soldering flux is coated with outward is lead powder, glass putty, copper powder, copper alloy powder, terne metal powder.
Example 5: as shown in Fig. 1 to Fig. 3 and example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, the metallic solution that screw axis immerses is plumbous liquid, tin liquor, copper liquid, copper alloy liquid, terne metal liquid.
Example 6: as shown in Fig. 1 to Fig. 3 and example 1, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, completes screw rod axis body quenching technical in vacuum box.
Example 7: as shown in Fig. 1 to Fig. 3 and example 1 or example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, wherein a kind of method that quenching technical adopts high frequency hardening, mid frequency induction hardening or heat treatment furnace to quench.
Example 8: as shown in Fig. 1 to Fig. 3 and example 6, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, when quenching in vacuum box, close vacuum pump, open suction valve fast, make air inlet fast in vacuum box, by the time when vacuum box internal pressure and normal-pressure balance, cut out suction valve reopens vacuum pump and carries out negative-pressure ward, and above-mentioned rapid pressure and fast decompression process hocket once.
Example 9: as shown in Fig. 1 to Fig. 3 and example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, immerse in metallic solution manufacturing process at vacuum box inner screw axis body, close vacuum pump, open suction valve fast, make air inlet fast in vacuum box, by the time when vacuum box internal pressure and normal-pressure balance, cut out suction valve reopens vacuum pump and carries out negative-pressure ward, and above-mentioned rapid pressure and fast decompression process hocket once.
Example 10: as shown in Fig. 1 to Fig. 3 and example 1 or example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, the method that the described relative position multi-disc sheet parts 1 of the spiral oblique crank Z after moulding and axle 2 being carried out profile is fixed is: with axial force clamping sheet parts 1 on axle, and fixing relative position.
Example 11: as shown in Fig. 1 to Fig. 3 and example 1 or example 2, the left-handed female screw axle of the inside multiple-grooved that disclosed a kind of metal layer is filled, the method that the described relative position multi-disc sheet parts 1 of the spiral oblique crank Z after moulding and axle 2 being carried out profile is fixed is: adopt auxiliary clamp, axial grip sheet parts 1 while clamp shaft, and fixing relative position.
Below by reference to the accompanying drawings mode of execution of the present utility model is explained in detail; but the utility model is not limited thereto; in the ken that person of ordinary skill in the field possesses; can also make a variety of changes under the prerequisite not departing from the utility model aim; person of ordinary skill in the field is from above-mentioned design; without performing creative labour, done all conversion, all drop within protection domain of the present utility model.
Claims (2)
1. a left-handed female screw axle for the inside multiple-grooved of metal layer filling, comprises sheet parts (1), axle (2), it is characterized in that:
The outline shape of described sheet parts (1) is the cross section outline shape of left-handed female screw axle engaging piece, and there is engaging piece (4) at the bottom of the tooth concaved the outside of sheet parts (1), and has cambered outwards tooth top engaging piece (5);
Described sheet parts (1) adopts punching press, Linear cut, sheet metal is processed into sheet parts (1);
There is axis hole in described sheet parts (1), in axis hole, have key shape tooth projecting apertures (6) that more than one profile of tooth is protruded;
The spiral groove (3) that the outside in the stage casing of described axle (2) has one or more left-handed;
The quantity that profile of tooth in described sheet parts (1) axis hole is protruded is identical with the described quantity of the groove of the external helicoid shape of axle (2), and cooperatively interacts;
The cover that the outside in the stage casing of described axle (2) is closely orderly has multi-disc sheet parts (1);
Relative position between described axle (2) and multi-disc sheet parts (1) is fixed;
Connect with spot welding between described multi-disc sheet parts (1), the soldering point at least two of adjacent two panels sheet parts (1);
Metal layer is filled with in gap mutual between described axle (2) and multi-disc sheet parts (1), form Surface of action at the bottom of continuous print left-hand teeth after engaging piece (4) superposition at the bottom of the tooth of multi-disc sheet parts (1), after tooth top engaging piece (5) superposition of multi-disc sheet parts (1), form the left-handed tooth top Surface of action of continuous print.
2. the left-handed female screw axle of the inside multiple-grooved of a kind of metal layer filling according to claim 1, it is characterized in that: in described sheet parts (1), have axis hole, have key shape tooth projecting apertures (6) that six profiles of tooth are protruded in axis hole, there are six left-handed spiral grooves (3) outside in the stage casing of described axle (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520569550.5U CN205036557U (en) | 2015-08-02 | 2015-08-02 | Levogyration female screw rod axle of inside multislot that metal level was filled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520569550.5U CN205036557U (en) | 2015-08-02 | 2015-08-02 | Levogyration female screw rod axle of inside multislot that metal level was filled |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205036557U true CN205036557U (en) | 2016-02-17 |
Family
ID=55295462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520569550.5U Expired - Fee Related CN205036557U (en) | 2015-08-02 | 2015-08-02 | Levogyration female screw rod axle of inside multislot that metal level was filled |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205036557U (en) |
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2015
- 2015-08-02 CN CN201520569550.5U patent/CN205036557U/en not_active Expired - Fee Related
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160217 Termination date: 20160802 |
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| CF01 | Termination of patent right due to non-payment of annual fee |