CN216398063U - Contact assembly for core expansion tool and tool structure thereof - Google Patents
Contact assembly for core expansion tool and tool structure thereof Download PDFInfo
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- CN216398063U CN216398063U CN202122352787.6U CN202122352787U CN216398063U CN 216398063 U CN216398063 U CN 216398063U CN 202122352787 U CN202122352787 U CN 202122352787U CN 216398063 U CN216398063 U CN 216398063U
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- 230000006978 adaptation Effects 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The utility model discloses a contact assembly for an expanding core tool and a tool structure thereof, relates to the technical field of auxiliary tools of milling machines, and solves the technical problems of small contact surface and low stability of a contact part for supporting a cylinder part on the existing expanding core tool. The contact assembly comprises a contact assembly body, an adaptation assembly is arranged on the contact assembly body, the adaptation assembly comprises a contact plate, an inner screw rod, a locking nut and a locking nut, wherein one end of the inner screw rod is connected with the contact plate, the other end of the inner screw rod movably penetrates through the contact assembly body and then is in threaded connection with the locking nut, and the locking nut is in contact with one side, far away from the contact plate, of the contact assembly body; one end of the contact plate, which is far away from the inner screw rod, is a cylindrical arc surface A. According to the utility model, the contact surface of the contact assembly and the cylindrical part is increased through the contact plate and the cylindrical arc surface A which is arranged on the contact plate and has the same inner diameter with the cylindrical part, so that the stability of the tool structure adopting the contact assembly for supporting the cylindrical part is improved, and subsequent related operations can be smoothly carried out.
Description
Technical Field
The utility model relates to the technical field of auxiliary tools of milling machines, in particular to the technical field of adjustable clamps for numerical control milling machines.
Background
The tooling fixture is a tooling for short, namely a technical device, and specifically refers to a general name of various tools used in the manufacturing process. The tool comprises a cutter, a clamp, a die, a measuring tool, a checking fixture, an auxiliary tool, a bench tool, a station tool and the like. The clamp is a device for clamping a workpiece or guiding a cutter.
In the clamping for processing the cylindrical part with a large radius, conventional clamping tools such as a three-jaw chuck and the like are mainly adopted at present, and the clamping efficiency is low due to the fact that the conventional clamping tools are troublesome to use and complex to adjust. Based on this, a core frock that rises has been designed. The part for supporting the cylinder part on the core expanding tool is that the plane end of the core expanding tool is in contact with the inner circumferential surface of the cylinder, so that the contact part is two points, the contact surface is small, and the stability is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: in order to solve the technical problem, the utility model provides a contact assembly for an expanding core tool and a tool structure thereof.
The utility model specifically adopts the following technical scheme for realizing the purpose:
a contact assembly for an expanding core tool comprises a contact assembly body, wherein an adaptation assembly is arranged on the contact assembly body and comprises a contact plate and an inner screw rod, one end of the inner screw rod is connected with the contact plate, the other end of the inner screw rod movably penetrates through the contact assembly body and then is in threaded connection with a locking nut, and the locking nut is in contact with one side, far away from the contact plate, of the contact assembly body;
one end of the contact plate, which is far away from the inner screw rod, is a cylindrical arc surface A.
Further, the both sides that the contact plate is close to the one end of interior screw rod all are provided with the butt subassembly, the butt subassembly includes that the middle part links firmly U-shaped frame and joint on the contact plate in the inboard block rubber of U-shaped frame, keep away from on the block rubber one side indent of contact plate and become the cylinder arcwall face B with cylinder arcwall face A concentric circles.
Further, the U-shaped frame is fixed on the contact plate by screws.
Further, the rubber block is in interference fit with the inner side of the U-shaped frame.
Furthermore, a rectangular groove is formed in one side, close to the contact assembly body, of the contact plate, and a rectangular shaft body matched with the rectangular groove is formed in the top of the contact assembly body in a protruding mode.
Furthermore, a metal gasket is arranged between the bottom of the rectangular groove and the rectangular shaft body.
A tool structure comprises a supporting cylinder and a plurality of core expansion units arranged in an inner hole of the supporting cylinder, wherein each core expansion unit comprises a contact assembly, a top plate and an adjusting assembly, the contact assembly is any one of the contact assemblies, one end of a contact assembly body is matched with the top plate, the other end of the contact assembly body movably penetrates through the side wall of the supporting cylinder, the adjusting assembly is fixed on the supporting cylinder, is matched with the top plate and adjusts the size of the contact assembly body penetrating out of the side wall of the supporting cylinder by adjusting the radial position of the top plate relative to the axis of the supporting cylinder;
the contact plate is located the support section of thick bamboo outside, and cylindrical arc face A is coaxial with the support section of thick bamboo, lock nut is located the support section of thick bamboo hole.
Furthermore, the contact component body is a top pin, one end of the contact component body movably penetrates through the supporting cylinder, and the other end of the contact component body is matched with the top plate.
Furthermore, the knock pin is of a two-stage stepped shaft structure, a large-diameter end of the knock pin movably penetrates through the supporting cylinder, a small-diameter end of the knock pin movably penetrates through the top plate, a jacking spring is sleeved on the contact assembly, and two ends of the jacking spring are respectively abutted to the inner wall of the supporting cylinder and the top plate.
Furthermore, the adjusting component comprises a main screw rod, one end of the main screw rod is in threaded connection with the supporting cylinder, and the other end of the main screw rod movably penetrates through the top plate and then is in threaded connection with the main nut.
The utility model has the following beneficial effects:
1. the contact plate and the cylindrical arc surface A which is arranged on the contact plate and has the same inner diameter with the cylindrical part increase the contact surface of the contact assembly and the cylindrical part, improve the stability of the tool structure adopting the contact assembly for supporting the cylindrical part and facilitate the smooth follow-up related operation;
2. the contact plate which needs to be consistent with the inner diameter of the cylinder part is arranged to be detachable, so that the corresponding contact plate can be replaced according to the cylinder parts with different inner diameters, and the applicability of the utility model is improved; moreover, the contact plate is simple in mounting structure and convenient to replace, so that lower tooling cost can be controlled, and convenience in replacing the contact plate can be improved;
3. the abutting assembly is arranged to support the suspended part of the contact plate, so that a larger supporting area can be obtained through the larger contact plate, the suspended part of the larger contact plate can be supported, the situations of material fatigue and fracture caused by larger stress between the suspended part and the part of the stressed contact assembly body are prevented, and the service life of the utility model is prolonged;
4. the tool structure is simple in structure, low in manufacturing cost, simple to use, convenient to adjust and high in clamping efficiency, and facilitates smooth follow-up operation.
Drawings
FIG. 1 is a schematic structural view of a contact assembly;
FIG. 2 is a cross-sectional view of another view of the contact assembly;
FIG. 3 is a schematic view of a tooling structure;
FIG. 4 is a side view of the tooling structure;
fig. 5 is a schematic diagram of a position of the tooling structure for supporting a large-size cylindrical part.
Reference numerals: 1-contact assembly body, 2-contact plate, 3-locking nut, 4-internal screw, 5-U-shaped frame, 6-rubber block, 7-rectangular groove, 8-metal gasket, 9-supporting cylinder, 10-top plate, 11-tightening spring, 12-main nut, 13-main screw and 14-cylinder part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 2, a contact assembly for a core expansion tool comprises a contact assembly body 1, wherein an adaptation assembly is arranged on the contact assembly body 1, the adaptation assembly comprises a contact plate 2, an inner screw rod 4, one end of which is connected with the contact plate 2, the other end of which movably penetrates through the contact assembly body 1 and is in threaded connection with a locking nut 3, and the locking nut 3 is in contact with one side of the contact assembly body 1, which is far away from the contact plate 2;
one end of the contact plate 2, which is far away from the inner screw rod 4, is a cylindrical arc surface A.
The contact plate 2 is used for contacting with the inner circumferential surface of a large-size cylindrical part, in particular a cylindrical arc surface A is contacted with the inner circumferential surface of the cylindrical part, as shown in FIG. 5; meanwhile, according to the cylinder parts of different inner diameters, it is sufficient to assemble the contact plate 2 having the cylindrical arc face a in conformity with the inner diameter, specifically: the locking nut 3 is disassembled, the locking of the locking nut 3 combined with the contact plate 2 to the axial movement of the inner screw rod is released, then the inner screw rod 3 moves towards the contact plate 2 until the whole contact assembly body is withdrawn, then the inner screw rod fixedly connected with the contact plate 2 with the cylindrical arc-shaped surface A with the required size movably penetrates through the contact assembly body 1 and then is in threaded connection with the locking nut 3, and the contact plate and the locking nut are respectively contacted with two ends of the contact assembly body so that the contact plate is fixed relative to the contact assembly body.
According to the utility model, the contact surface of the contact assembly and the cylindrical part is increased through the contact plate 2 and the cylindrical arc surface A which is arranged on the contact plate and has the same inner diameter with the cylindrical part, so that the stability of the tool structure adopting the contact assembly for supporting the cylindrical part is improved, and subsequent related operations can be performed smoothly.
Meanwhile, in the utility model, the contact plate 2 which needs to be consistent with the inner diameter of the cylinder part is arranged in a detachable manner, so that the corresponding contact plate 2 can be replaced according to the cylinder parts with different inner diameters, and the applicability of the utility model is improved. And, the mounting structure of contact plate 2 is simple, it is convenient to change, can control lower frock cost, can improve the convenience of changing contact plate 2 again.
Example 2
A contact assembly for an expanding core tool comprises a contact assembly body 1, wherein an adaptation assembly is arranged on the contact assembly body 1, the adaptation assembly comprises a contact plate 2, an inner screw rod 4, one end of the inner screw rod is connected with the contact plate 2, the other end of the inner screw rod movably penetrates through the contact assembly body 1 and then is in threaded connection with a locking nut 3, and the locking nut 3 is in contact with one side, far away from the contact plate 2, of the contact assembly body 1;
one end of the contact plate 2, which is far away from the inner screw rod 4, is a cylindrical arc surface A.
The both sides that contact plate 2 is close to the one end of interior screw rod 4 all are provided with the butt subassembly, the butt subassembly includes that the middle part links firmly U-shaped frame 5 and joint on contact plate 2 in the inboard block rubber 6 of U-shaped frame, keep away from on block rubber 6 one side indent of contact plate 2 and become the cylinder arcwall face B with the cylinder arcwall face A concentric circles of a circle.
The fixing with respect to the U-shaped frame 5 is as follows: the U-shaped bracket 5 is fixed to the contact plate 2 by screws. The abutment assembly is an optional component and is therefore removably secured to the contact plate 2 by screws. The abutting assembly is arranged to support the suspended part of the contact plate, so that a larger supporting area can be obtained through the larger contact plate 2, the suspended part of the larger contact plate can be supported, the situation that the material is fatigued and broken due to larger stress between the suspended part and the part of the stressed contact assembly body is prevented, and the service life of the utility model is prolonged.
Further, the rubber block 6 is interference fitted inside the U-shaped frame 5. The supporting radiuses of the cylindrical parts with different radiuses are different, so that the rubber block 6 is directly clamped in the U-shaped frame 5, the rubber block 6 can be quickly detached and installed, and convenience in early-stage component preparation is improved.
Further, a rectangular groove 7 is formed in one side, close to the contact assembly body 1, of the contact plate 2, and the top of the contact assembly body 1 protrudes outwards to form a rectangular shaft body matched with the rectangular groove 7.
Further, a metal gasket 8 is arranged between the bottom of the rectangular groove 7 and the rectangular shaft body. The metal gasket 8 is arranged to enable the contact surface between the rectangular groove 7 and the rectangular shaft body to be stressed more uniformly.
Example 3
A tool structure comprises a supporting cylinder 9 and a plurality of expansion core units arranged in an inner hole of the supporting cylinder 9, wherein each expansion core unit comprises a contact assembly, a top plate 10 and an adjusting assembly, each contact assembly comprises a contact assembly body 1, an adaptation assembly is arranged on each contact assembly body 1, each adaptation assembly comprises a contact plate 2, an inner screw rod 4, one end of each inner screw rod is connected with the corresponding contact plate 2, the other end of each inner screw rod movably penetrates through the corresponding contact assembly body 1 and then is in threaded connection with a locking nut 3, and the locking nut 3 is in contact with one side, far away from the corresponding contact plate 2, of the corresponding contact assembly body 1;
one end, far away from the inner screw rod 4, of the contact plate 2 is a cylindrical arc-shaped surface A, one end of the contact assembly body 1 is matched with the top plate 10, the other end of the contact assembly body is movably penetrated through the side wall of the supporting cylinder 9, the adjusting assembly is fixed on the supporting cylinder 9 and matched with the top plate 10, and the size of the contact assembly body 1 penetrating out of the side wall of the supporting cylinder 9 is adjusted through adjusting the radial position of the top plate 10 relative to the axis of the supporting cylinder 9;
the contact plate 2 is located the outside of a supporting cylinder 9, and cylindrical arc face A is coaxial with a supporting cylinder 9, lock nut 3 is located in the hole of a supporting cylinder 9.
The core expansion unit is arranged in the support cylinder and comprises a contact component, a top plate and an adjusting component, the contact component adjusts the size of the support cylinder extending out of the contact component through the adjusting component, and the adjusting component can adopt a link mechanism, a gear and rack combination, a hydraulic cylinder and the like. The adjusting assembly adjusts the position of the top plate so that the contact assembly moves with the movement of the top plate.
When the large-size cylindrical part is fixed, the cylindrical part is sleeved on the supporting cylinder, the contact component radially supports the large-size cylindrical part through the adjusting component, so that an annular space is formed between the cylindrical part and the supporting cylinder, and the supporting and positioning of the large-size cylindrical part are completed, as shown in fig. 5.
The tool structure for fixing the large-size cylindrical part is simple in structure, low in manufacturing cost, simple to use, convenient to adjust, high in clamping efficiency and beneficial to smooth follow-up operation.
Example 4
A tool structure comprises a supporting cylinder 9 and a plurality of expansion core units arranged in an inner hole of the supporting cylinder 9, wherein each expansion core unit comprises a contact assembly, a top plate 10 and an adjusting assembly, each contact assembly comprises a contact assembly body 1, an adaptation assembly is arranged on each contact assembly body 1, each adaptation assembly comprises a contact plate 2, an inner screw rod 4, one end of each inner screw rod is connected with the corresponding contact plate 2, the other end of each inner screw rod movably penetrates through the corresponding contact assembly body 1 and then is in threaded connection with a locking nut 3, and the locking nut 3 is in contact with one side, far away from the corresponding contact plate 2, of the corresponding contact assembly body 1;
one end, far away from the inner screw rod 4, of the contact plate 2 is a cylindrical arc-shaped surface A, one end of the contact assembly body 1 is matched with the top plate 10, the other end of the contact assembly body is movably penetrated through the side wall of the supporting cylinder 9, the adjusting assembly is fixed on the supporting cylinder 9 and matched with the top plate 10, and the size of the contact assembly body 1 penetrating out of the side wall of the supporting cylinder 9 is adjusted through adjusting the radial position of the top plate 10 relative to the axis of the supporting cylinder 9;
the contact plate 2 is located the outside of a supporting cylinder 9, and cylindrical arc face A is coaxial with a supporting cylinder 9, lock nut 3 is located in the hole of a supporting cylinder 9.
Preferably, the expansion core unit includes two contact assemblies, as shown in fig. 3, which are respectively located at both sides of the adjustment assembly. The contact assemblies are adjusted through the adjusting assembly, the supporting of the large-size cylindrical part by the point positions can be synchronously adjusted, the adjustment of obtaining the supporting point positions through one-time adjustment is realized, and the convenience of adjustment and the supporting stability are improved.
Preferably, the core expansion units are four in number and are distributed along the axis center of the support cylinder symmetrically. The large-size cylindrical part is circumferentially supported by the multiple groups of core expanding units, so that the supporting points are multiple and uniform, and the fixing stability of the large-size cylindrical part is ensured.
The contact component body 1 is a top pin, one end of the contact component body movably penetrates through the supporting cylinder 9, and the other end of the contact component body is matched with the top plate 10.
The ejector pin has the following specific structure: the knock pin is the second grade stepped shaft structure, and its big footpath end activity runs through a supporting cylinder 9, and its path end activity runs through roof 10, and the cover is equipped with a top tension spring 11 on the contact assembly, the both ends of top tension spring 11 respectively with supporting cylinder 9 inner wall and roof 10 butt.
Through the arrangement of the jacking spring, the pre-tightening force can be provided on the contact assembly, so that the contact assembly can support a large-size cylindrical part conveniently; and the contact assembly and the top plate can be directly connected in an inserting manner to form a simple matching structure, so that the structure of the core expansion tool is further simplified, the early-stage manufacturing cost is reduced, the later-stage maintenance convenience is improved, and the processing cost of parts such as large-size cylindrical parts is favorably controlled.
The specific embodiments regarding the adjustment assembly are as follows: as shown in fig. 3, the adjusting assembly includes a main screw 13 having one end connected to the supporting cylinder 9 by screw threads and the other end movably penetrating the top plate 10 and then connected to a main nut 12 by screw threads.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A contact assembly for an expanding core tool comprises a contact assembly body (1), and is characterized in that an adaptation assembly is arranged on the contact assembly body (1), the adaptation assembly comprises a contact plate (2), an inner screw rod (4) with one end connected with the contact plate (2) and the other end movably penetrating through the contact assembly body (1) and then in threaded connection with a locking nut (3), and the locking nut (3) is in contact with one side, far away from the contact plate (2), of the contact assembly body (1);
one end of the contact plate (2) far away from the inner screw (4) is a cylindrical arc surface A.
2. The contact assembly for the core expanding tool is characterized in that abutting assemblies are arranged on two sides of one end, close to an inner screw rod (4), of the contact plate (2), each abutting assembly comprises a U-shaped frame (5) and a rubber block (6), the middle portion of each abutting assembly is fixedly connected onto the contact plate (2), the rubber block (6) is connected to the inner side of the U-shaped frame (5), and one side, far away from the contact plate (2), of the rubber block (6) is inwards concave to form a cylindrical arc-shaped surface B which is concentric with the cylindrical arc-shaped surface A.
3. The contact assembly for the expansion core tool is characterized in that the U-shaped frame (5) is fixed on the contact plate (2) through screws.
4. The contact assembly for the core expanding tool as claimed in claim 2, wherein the rubber block (6) is in interference fit with the inner side of the U-shaped frame (5).
5. The contact assembly for the expansion core tool as claimed in claim 1, wherein a rectangular groove (7) is formed in one side of the contact plate (2) close to the contact assembly body (1), and the top of the contact assembly body (1) protrudes outwards to form a rectangular shaft body matched with the rectangular groove (7).
6. The contact assembly for the expansion core tool as claimed in claim 5, wherein a metal gasket (8) is arranged between the bottom of the rectangular groove (7) and the rectangular shaft body.
7. A tool structure is characterized by comprising a support cylinder (9) and a plurality of expansion core units arranged in an inner hole of the support cylinder (9), wherein each expansion core unit comprises a contact assembly, a top plate (10) and an adjusting assembly, the contact assembly is the contact assembly of any one of claims 1-6, one end of a contact assembly body (1) is matched with the top plate (10), the other end of the contact assembly body movably penetrates through the side wall of the support cylinder (9), the adjusting assembly is fixed on the support cylinder (9), is matched with the top plate (10) and adjusts the size of the contact assembly body (1) penetrating out of the side wall of the support cylinder (9) by adjusting the radial position of the top plate (10) relative to the axis of the support cylinder (9);
the contact plate (2) is located the outside of the supporting cylinder (9), the arc-shaped surface A of the cylinder is coaxial with the supporting cylinder (9), and the locking nut (3) is located in an inner hole of the supporting cylinder (9).
8. A tooling structure according to claim 7, characterized in that the contact assembly body (1) is a knock pin, one end of which is movably passed through the support cylinder (9) and the other end of which is engaged with the top plate (10).
9. The tooling structure of claim 8, wherein the ejector pin is of a two-stage stepped shaft structure, the large-diameter end of the ejector pin movably penetrates through the supporting cylinder (9), the small-diameter end of the ejector pin movably penetrates through the top plate (10), the contact assembly is sleeved with an ejecting spring (11), and two ends of the ejecting spring (11) are respectively abutted to the inner wall of the supporting cylinder (9) and the top plate (10).
10. A tooling structure according to claim 8, wherein the adjusting assembly comprises a main screw (13) having one end in threaded connection with the supporting cylinder (9) and the other end movably penetrating through the top plate (10) and then in threaded connection with the main nut (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352787.6U CN216398063U (en) | 2021-09-27 | 2021-09-27 | Contact assembly for core expansion tool and tool structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352787.6U CN216398063U (en) | 2021-09-27 | 2021-09-27 | Contact assembly for core expansion tool and tool structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216398063U true CN216398063U (en) | 2022-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122352787.6U Active CN216398063U (en) | 2021-09-27 | 2021-09-27 | Contact assembly for core expansion tool and tool structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216398063U (en) |
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2021
- 2021-09-27 CN CN202122352787.6U patent/CN216398063U/en active Active
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Effective date of registration: 20240228 Address after: No. 119, Group 16, Huahua New Village, Hong'an Town, Longquanyi District, Chengdu City, Sichuan Province, 610100 Patentee after: Zhong Jinfu Country or region after: China Address before: 550009 facade 5, building 12, xinglongyuan, Southwest Ring Road, economic and Technological Development Zone, Guiyang, Guizhou Patentee before: GUIZHOU YIWEIXIN ELECTROMECHANICAL EQUIPMENT Co.,Ltd. Country or region before: China |
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Effective date of registration: 20240313 Address after: No. 1 Factory Building, 200 Checheng East Fifth Road, Baihe Town, Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan Province, 610100 Patentee after: Chengdu Wantang Technology Co.,Ltd. Country or region after: China Address before: No. 119, Group 16, Huahua New Village, Hong'an Town, Longquanyi District, Chengdu City, Sichuan Province, 610100 Patentee before: Zhong Jinfu Country or region before: China |
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