CN219853582U - Twist drill sharpening auxiliary device - Google Patents
Twist drill sharpening auxiliary device Download PDFInfo
- Publication number
- CN219853582U CN219853582U CN202321099808.0U CN202321099808U CN219853582U CN 219853582 U CN219853582 U CN 219853582U CN 202321099808 U CN202321099808 U CN 202321099808U CN 219853582 U CN219853582 U CN 219853582U
- Authority
- CN
- China
- Prior art keywords
- sleeve
- auxiliary
- twist drill
- vertical frame
- sleeved
- 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
- 230000007306 turnover Effects 0.000 description 7
- 238000005498 polishing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The utility model discloses a twist drill sharpening auxiliary device, which relates to the technical field of twist drill sharpening, and solves the technical problems that the twist drill is inconvenient to polish and support due to the limited supporting angle of the twist drill when sharpening the twist drill, and the sharpening efficiency of the twist drill is lower due to the complex clamping mode when sharpening a large number of twist drills; the device comprises a supporting vertical frame, wherein an auxiliary sleeve box is arranged on one side of the supporting vertical frame, a roll-over stand is fixedly arranged between the supporting vertical frame and the auxiliary sleeve box, an arc-shaped sliding plate is fixedly arranged on one side of the auxiliary sleeve box, and one end of the arc-shaped sliding plate is in sliding sleeve joint with the supporting vertical frame; the utility model can drive the auxiliary sleeve box to adjust the overturning angle by rotating the adjusting screw rod, and can realize quick and convenient stretching of the movable sleeve rod to drive the two clamping rotating plates to open and close, so that the twist drill can be quickly and conveniently replaced.
Description
Technical Field
The utility model relates to the technical field of twist drill polishing, in particular to an auxiliary device for sharpening a twist drill.
Background
Twist drills are tools that drill round holes in a workpiece by rotating them about a fixed axis, named as twist-like flutes with 2, 3 or more flutes, but 2 flutes are most common, twist drills can be clamped on hand-held drilling tools or drills, milling machines, lathes or even machining centers, which are manual, electric, and the drill bit material is typically high-speed tool steel or cemented carbide; however, when polishing the twist drill blade, the twist drill is inconvenient to polish and support due to limited supporting angle, and when polishing a large number of twist drills, the polishing efficiency of the twist drill is low due to complex clamping mode;
for this purpose, twist drill sharpening aids are designed to solve the above-mentioned problems.
Disclosure of Invention
The utility model provides an auxiliary sharpening device for twist drills, which solves the technical problems that when the twist drills are sharpened, the twist drills are inconvenient to polish and support due to limited supporting angles, and when a large number of twist drills are sharpened, the sharpening efficiency of the twist drills is low due to complex clamping modes.
In order to solve the technical problems, the twist drill sharpening auxiliary device provided by the utility model comprises a supporting vertical frame, an auxiliary sleeve box is arranged on one side of the supporting vertical frame, a roll-over stand is fixedly arranged between the supporting vertical frame and the auxiliary sleeve box, an arc-shaped sliding plate is fixedly arranged on one side of the auxiliary sleeve box, one end of the arc-shaped sliding plate is in sliding sleeve joint with the supporting vertical frame, a limiting plate is fixedly sleeved in the arc-shaped sliding plate, a connecting transverse plate is fixedly arranged at the top of the supporting vertical frame, an angle adjusting assembly is arranged between the supporting vertical frame and the auxiliary sleeve box, a servo hydraulic cylinder is fixedly sleeved in the auxiliary sleeve box, and a clamping assembly is arranged in the auxiliary sleeve box.
Preferably, the angle modulation subassembly is including the switching frame, cup joints revolving rack, pivot sleeve, screw thread sleeve, adjusting screw, adjustment handle and connection round bar, one side fixed mounting of auxiliary sleeve case has the switching frame, the outside of switching frame has rotated through the connection round bar and has cup jointed the revolving rack, one side fixed mounting who cup joints the revolving rack has the screw shaft sleeve, the screw thread sleeve has been cup jointed to the inside fixed of supporting the vertical frame, screw thread sleeve's internal thread has cup jointed adjusting screw, screw thread sleeve is run through to adjusting screw's one end, and adjusting screw's one end and screw shaft sleeve rotate and cup joint, adjusting screw's the other end fixedly connected with adjustment handle.
Preferably, two fixing screws are arranged in the supporting vertical frame, and the threaded sleeve is fixedly connected with the supporting vertical frame through the two fixing screws.
Preferably, the clamping assembly comprises a linking sleeve plate, a movable sleeve, a folding rotating frame, a folding connecting plate, a supporting rotating frame, a sleeve connecting rod, a clamping rotating plate, a movable sleeve rod and an anti-slip pad, wherein the linking sleeve plate is fixedly sleeved in the auxiliary sleeve box, the movable sleeve is fixedly sleeved in the linking sleeve plate, the movable sleeve rod is movably sleeved in the movable sleeve, the supporting rotating frame is fixedly connected with the top end of the movable sleeve rod, the two clamping rotating plates are rotatably sleeved at the top of the supporting rotating frame through the sleeve connecting rod, the folding rotating frame is fixedly arranged on one side of the clamping rotating plate and on two sides of the movable sleeve, the folding connecting plate is rotatably sleeved between each two corresponding folding rotating frames, three anti-slip pads are fixedly sleeved in the inner part of the clamping rotating plate, and the bottom end of the movable sleeve rod is fixedly connected with the hydraulic support rod in the servo hydraulic cylinder.
Preferably, each folding rotating frame is fixedly sleeved with a supporting round rod, and two ends of each folding connecting plate are rotatably sleeved with the folding rotating frame through the supporting round rods.
Preferably, two fixing frames are fixedly arranged in the auxiliary sleeve box, and the connecting sleeve plate is fixedly sleeved with the auxiliary sleeve box through the two fixing frames.
Compared with the related art, the twist drill sharpening auxiliary device provided by the utility model has the following beneficial effects:
the utility model provides a twist drill sharpening auxiliary device, which is characterized in that a supporting vertical frame is fixed at the bottom of a drill grinder through a connecting transverse plate, a turnover frame is fixedly arranged at one side of the supporting vertical frame, so that an auxiliary sleeve box can be rotatably supported at one side of the supporting vertical frame, an arc-shaped sliding plate is fixedly connected to one side of the auxiliary sleeve box in a movable sleeving manner with the supporting vertical frame in a matched manner, the auxiliary sleeve box can stably slide, a sleeving turnover frame is rotatably sleeved at one side of the auxiliary sleeve box through the turnover frame in a matched manner, a rotating shaft sleeve is fixedly arranged at one side of the sleeving rotary frame, an adjusting screw is fixedly sleeved in the supporting vertical frame in a threaded sleeve in a threaded manner, one end of the adjusting screw is rotatably sleeved with the rotating shaft sleeve, and the auxiliary sleeve box can be driven to rotate by rotating the adjusting screw to adjust a turnover angle; through the inside fixed mounting at supplementary pouring jacket has two mounts for connect the nest plate and fix in the inside of supplementary pouring jacket, secondly at the inside fixed movable sleeve that has cup jointed of linking the nest plate, and at movable telescopic inside through movable loop bar activity cup joint support revolving rack, the cooperation has rotated the outside of having cup jointed two clamp revolving plates at the support revolving rack, and cup joint six slipmats in the inside of two clamp revolving plates, make when pressing from both sides the twist drill, avoid appearing dropping, the cooperation has again rotated between two clamp revolving plates and movable sleeve and has cup jointed the receipts and has closed the even board, and then can rotate the support to the clamp revolving plate, the cooperation has cup jointed servo hydraulic cylinder at the inside fixed of supplementary pouring jacket again, make servo hydraulic cylinder and movable loop bar fixed connection, realize quick convenient tensile movable loop bar, drive two clamp revolving plates and open and shut, so that quick convenient is to twist drill into the line and change the dress.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a partial side view of the present utility model;
FIG. 3 is an enlarged schematic view of the structure of the present utility model A;
fig. 4 is an enlarged schematic view of the structure of the present utility model at B.
Reference numerals in the drawings: 1. supporting the vertical frame; 2. a roll-over stand; 3. an auxiliary sleeve box; 4. an arc-shaped sliding plate; 5. a connecting transverse plate; 6. an angle adjusting component; 601. a transfer frame; 602. sleeving a rotating frame; 603. a rotating shaft sleeve; 604. a threaded sleeve; 605. adjusting a screw; 606. adjusting the handle; 607. connecting round rods; 7. a limiting plate; 8. a fixing frame; 9. a clamping assembly; 901. a linking sleeve plate; 902. a movable sleeve; 903. a folding rotating frame; 904. folding the connecting plate; 905. supporting a rotating frame; 906. sleeving a rotating rod; 907. clamping the rotating plate; 908. a movable loop bar; 909. an anti-slip pad; 10. a set screw; 11. a servo hydraulic cylinder; 12. and supporting the round rod.
Description of the embodiments
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model; all other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
According to the first embodiment, as shown in fig. 1-4, the utility model comprises a supporting vertical frame 1, an auxiliary sleeve box 3 is arranged on one side of the supporting vertical frame 1, a roll-over stand 2 is fixedly arranged between the supporting vertical frame 1 and the auxiliary sleeve box 3, an arc-shaped sliding plate 4 is fixedly arranged on one side of the auxiliary sleeve box 3, one end of the arc-shaped sliding plate 4 is in sliding sleeve joint with the supporting vertical frame 1, a limiting plate 7 is fixedly sleeved in the arc-shaped sliding plate 4, a connecting transverse plate 5 is fixedly arranged at the top of the supporting vertical frame 1, an angle adjusting assembly 6 is arranged between the supporting vertical frame 1 and the auxiliary sleeve box 3, a servo hydraulic cylinder 11 is fixedly sleeved in the auxiliary sleeve box 3, and a clamping assembly 9 is arranged in the auxiliary sleeve box 3.
In the second embodiment, based on the first embodiment, the angle adjusting assembly 6 includes a adapting frame 601, a socket rotating frame 602, a rotating shaft sleeve 603, a threaded sleeve 604, an adjusting screw 605, an adjusting handle 606 and a connecting round rod 607, wherein one side of the auxiliary sleeve 3 is fixedly provided with the adapting frame 601, the external part of the adapting frame 601 is rotationally sleeved with the socket rotating frame 602 through the connecting round rod 607, one side of the socket rotating frame 602 is fixedly provided with the rotating shaft sleeve 603, the internal part of the supporting vertical frame 1 is fixedly sleeved with the threaded sleeve 604, the internal thread of the threaded sleeve 604 is sleeved with the adjusting screw 605, one end of the adjusting screw 605 penetrates through the threaded sleeve 604, one end of the adjusting screw 605 is rotationally sleeved with the rotating shaft sleeve 603, and the other end of the adjusting screw 605 is fixedly connected with the adjusting handle 606, so that the angle adjustment of the twist drill blade inside the auxiliary sleeve 3 is conveniently carried out, and the twist drill blade is conveniently contacted with the outer wall of the polishing turntable.
In the third embodiment, on the basis of the second embodiment, two fixing screws 10 are provided in the support frame 1, and the threaded sleeve 604 is fixedly connected with the support frame 1 through the two fixing screws 10, so that the threaded sleeve 604 can be fixed in the support frame 1.
In the fourth embodiment, based on the first embodiment, the clamping assembly 9 includes a linking sleeve 901, a movable sleeve 902, a folding rotating frame 903, a folding connecting plate 904, a supporting rotating frame 905, a sleeving rotating rod 906, a clamping rotating plate 907, a movable sleeve 908 and an anti-slip pad 909, the linking sleeve 901 is fixedly sleeved in the auxiliary sleeve 3, the movable sleeve 902 is fixedly sleeved in the linking sleeve 901, the movable sleeve 908 is movably sleeved in the movable sleeve 902, the supporting rotating frame 905 is fixedly connected to the top of the movable sleeve 908, the folding rotating frame 903 is fixedly mounted on one side of the two clamping rotating plates 907 and on two sides of the movable sleeve 902 through the sleeving rotating rod 906, the folding connecting plate 904 is fixedly sleeved between each two corresponding folding rotating frames 903, three pads 909 are fixedly sleeved in the interiors of the two clamping rotating plates 907, and the bottom end of the movable sleeve 908 is fixedly connected with a hydraulic strut in the servo hydraulic cylinder 11, so that quick twist drills can be quickly and efficiently used for polishing the twist drills.
In the fifth embodiment, on the basis of the fourth embodiment, the inner part of each folding rotating frame 903 is fixedly sleeved with a supporting round rod 12, and two ends of two folding connecting plates 904 are rotatably sleeved with the folding rotating frame 903 through the supporting round rod 12, so that the two folding connecting plates 904 are rotatably sleeved between the movable sleeve 902 and the folding connecting plates 904.
In the sixth embodiment, on the basis of the fourth embodiment, two fixing frames 8 are fixedly installed in the auxiliary casing 3, and the adapter sleeve plate 901 is fixedly sleeved with the auxiliary casing 3 through the two fixing frames 8, so that the adapter sleeve plate 901 can be fixed in the auxiliary casing 3.
Working principle: firstly, fixing a supporting vertical frame 1 at the bottom of a drill bit grinding machine through a connecting transverse plate 5, secondly, fixedly mounting a turnover frame 2 on one side of the supporting vertical frame 1, so that an auxiliary sleeve box 3 can be rotatably supported on one side of the supporting vertical frame 1, fixedly connecting an arc-shaped sliding plate 4 on one side of the auxiliary sleeve box 3 to be movably sleeved with the supporting vertical frame 1, so that the auxiliary sleeve box 3 can stably slide, rotatably sleeved with a sleeved rotary frame 602 through a turnover frame 601 on one side of the auxiliary sleeve box 3, fixedly mounting a rotary shaft sleeve 603 on one side of the sleeved rotary frame 602, fixedly sleeved with a threaded sleeve 604 in the supporting vertical frame 1, and rotatably sleeved with an adjusting screw 605, so that one end of the adjusting screw 605 is rotatably sleeved with the rotary shaft sleeve 603, and the auxiliary sleeve box 3 can be driven to perform turnover angle adjustment by rotating the adjusting screw 605; through the inside fixed mounting at supplementary pouring jacket 3 has two mounts 8 for linking the pouring jacket 901 and fixing in the inside of supplementary pouring jacket 1, secondly at the inside fixed movable sleeve 902 that has cup jointed of linking pouring jacket 901, and the inside through movable loop 908 movable sleeve that has cup jointed support revolving rack 905 at movable sleeve 902, the cooperation has cup jointed two clamp revolving racks 907 in the outside rotation of support revolving rack 905, and cup joint six slipmat 909 in the inside of two clamp revolving racks 907, when making to press from both sides tight to the fluted drill, avoid appearing dropping, the cooperation has cup jointed receipts and has closed even board 904 again in the rotation between two clamp revolving racks 907 and movable sleeve 902, and then can rotate the support to clamp revolving racks 907, the cooperation has cup jointed servo hydraulic cylinder 11 again in the inside fixed of supplementary pouring jacket 3, make servo hydraulic cylinder 11 and movable loop 908 fixed connection, realize quick convenient tensile movable loop 908, drive two clamp revolving racks 907 open and shut, so that quick convenient to the change to the fluted drill into.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a fluted twist drill sharpening auxiliary device, includes support vertical frame (1), its characterized in that: the utility model discloses a support vertical frame (1), support vertical frame (1) and auxiliary sleeve (3) are fixed mounting has roll-over stand (2) between one side, one side fixed mounting of auxiliary sleeve (3) has arc slide (4), the one end of arc slide (4) is slided and is cup jointed with support vertical frame (1), limiting plate (7) have been cup jointed to the inside of arc slide (4), the top fixed mounting of support vertical frame (1) has connection diaphragm (5), be equipped with angle modulation subassembly (6) between support vertical frame (1) and auxiliary sleeve (3), servo pneumatic cylinder (11) have been cup jointed to the inside fixed of auxiliary sleeve (3), the inside of auxiliary sleeve (3) is equipped with clamping assembly (9).
2. The twist drill sharpening auxiliary device according to claim 1, wherein the angle adjusting component (6) comprises a switching frame (601), a sleeving rotating frame (602), a rotating shaft sleeve (603), a threaded sleeve (604), an adjusting screw (605), an adjusting handle (606) and a connecting round rod (607), the switching frame (601) is fixedly arranged on one side of the auxiliary box (3), the sleeving rotating frame (602) is rotatably sleeved outside the switching frame (601) through the connecting round rod (607), the rotating shaft sleeve (603) is fixedly arranged on one side of the sleeving rotating frame (602), the threaded sleeve (604) is fixedly sleeved inside the supporting vertical frame (1), the adjusting screw (605) is sleeved on an internal thread of the threaded sleeve (604), one end of the adjusting screw (605) penetrates through the threaded sleeve (604), one end of the adjusting screw (605) is rotatably sleeved with the rotating shaft sleeve (603), and the adjusting handle (606) is fixedly connected with the other end of the adjusting screw (605).
3. The twist drill sharpening aid as defined in claim 2, wherein two fixing screws (10) are provided inside the support stand (1), and the threaded sleeve (604) is fixedly connected with the support stand (1) by means of the two fixing screws (10).
4. The twist drill sharpening auxiliary device according to claim 1, wherein the clamping assembly (9) comprises a connecting sleeve plate (901), a movable sleeve (902), a folding swivel (903), folding connecting plates (904), supporting swivel (905), a sleeving rotating rod (906), clamping swivel (907), movable sleeve rods (908) and anti-slip pads (909), the connecting sleeve plate (901) is fixedly sleeved in the auxiliary sleeve box (3), the movable sleeve (902) is fixedly sleeved in the connecting sleeve plate (901), the movable sleeve rod (908) is movably sleeved in the movable sleeve (902), the supporting swivel (905) is fixedly connected to the top end of the movable sleeve rod (908), the two clamping swivel (907) are rotatably sleeved on the top of the supporting swivel (905) through the sleeving rotating rod (906), the folding swivel (903) are fixedly mounted on one side of each clamping swivel (907) and on two sides of the movable sleeve (902), the two corresponding clamping swivel (903) are fixedly sleeved with each other, and the two clamping swivel (904) are fixedly connected with the inner side of each clamping swivel (908), and the two corresponding clamping swivel (904) are fixedly sleeved with the inner connecting sleeve rods (908).
5. The twist drill sharpening auxiliary device according to claim 4, wherein each folding turret (903) is fixedly sleeved with a supporting round rod (12), and two ends of each folding connecting plate (904) are rotatably sleeved with the folding turret (903) through the supporting round rods (12).
6. The twist drill sharpening auxiliary device according to claim 4, wherein two fixing frames (8) are fixedly arranged in the auxiliary sleeve box (3), and the engagement sleeve plate (901) is fixedly sleeved with the auxiliary sleeve box (3) through the two fixing frames (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321099808.0U CN219853582U (en) | 2023-05-09 | 2023-05-09 | Twist drill sharpening auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321099808.0U CN219853582U (en) | 2023-05-09 | 2023-05-09 | Twist drill sharpening auxiliary device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219853582U true CN219853582U (en) | 2023-10-20 |
Family
ID=88344580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321099808.0U Active CN219853582U (en) | 2023-05-09 | 2023-05-09 | Twist drill sharpening auxiliary device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219853582U (en) |
-
2023
- 2023-05-09 CN CN202321099808.0U patent/CN219853582U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS60141402A (en) | Lathe | |
| CN208195703U (en) | A kind of chuck strong based on lathe stability | |
| CN210967098U (en) | Double-end drilling machine for processing upper center hole of hinge shaft connecting lug | |
| CN214814931U (en) | Clamping device for machining shaft parts | |
| CN219853582U (en) | Twist drill sharpening auxiliary device | |
| CN213702507U (en) | Turning and milling composite machine tool with replaceable tailstock | |
| CN213858468U (en) | Tool production is with high-efficient grinding device | |
| CN110712040B (en) | Motor casing drilling and tapping equipment | |
| CN208853719U (en) | Lathe is used in a kind of production of copper rod | |
| CN214925049U (en) | Blow molding pipe drilling equipment | |
| CN109462316A (en) | It is a kind of to facilitate fixed rotor auxiliary processing device | |
| CN213438661U (en) | Clamping device of grinding head of numerical control cylindrical grinding machine | |
| CN109693113A (en) | A kind of processing unit (plant) and method of lifting lug support | |
| CN213052776U (en) | Numerical control lathe processing clamping device | |
| CN208067825U (en) | A kind of fixture of novel carving and milling machine | |
| CN221047835U (en) | Floor type boring machine workbench | |
| CN217941959U (en) | Automatic metal drilling machine | |
| CN212917671U (en) | Radial drill big work piece clamping device | |
| CN109128248A (en) | Beam drill is used in a kind of processing of air cooler air flue | |
| CN219005482U (en) | Five-axis numerical control tool grinding machine | |
| CN220007211U (en) | High-efficient accurate vertical machining center | |
| CN210877913U (en) | Locomotive engine transmission shaft machining device | |
| CN217254557U (en) | Ring type part adding type special clamp for numerical control vertical lathe | |
| CN218983649U (en) | Welding equipment for fan processing | |
| CN216421930U (en) | Knife sharpener |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No.8, Dongqiang Road, Xindong industrial cluster, Xinxiang City, Henan Province Patentee after: Henan Heyi Precision Tools Co.,Ltd. Country or region after: China Address before: No.8, Dongqiang Road, Xindong industrial cluster, Xinxiang City, Henan Province Patentee before: HENAN YIGONG DRILLING INDUSTRY CO.,LTD. Country or region before: China |