CN114643307A - Automobile part precision mold with in-mold tapping cooling structure - Google Patents
Automobile part precision mold with in-mold tapping cooling structure Download PDFInfo
- Publication number
- CN114643307A CN114643307A CN202210200505.7A CN202210200505A CN114643307A CN 114643307 A CN114643307 A CN 114643307A CN 202210200505 A CN202210200505 A CN 202210200505A CN 114643307 A CN114643307 A CN 114643307A
- Authority
- CN
- China
- Prior art keywords
- tapping
- mold
- cooling structure
- positioning seat
- positioning
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/16—Thread cutting; Automatic machines specially designed therefor in holes of workpieces by taps
- B23G1/18—Machines with one working spindle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an automobile part precision die with an in-die tapping cooling structure, which belongs to the technical field of dies and comprises an upper die base and a lower die base, wherein the upper die base is provided with a tapping structure, the lower die base is provided with a positioning seat, a plurality of cooling structures and a plurality of conveying structures, a pressure sensor is arranged in the positioning seat, a part is placed on the positioning seat, the positioning seat is provided with a plurality of positioning blocks, the positioning blocks are positioned at two sides of the part, the tapping structure comprises a rotary motor base, connecting bearing and tapping lead screw, cooling structure includes the pump body, spray pipe and inlet tube, and conveying structure includes driving motor and transmission lead screw, the last controller that is provided with of driving motor, is provided with the mounting groove on the positioning seat, and driving motor installs in the mounting groove, and transmission lead screw passes the positioning seat and connects on driving motor, and a plurality of transmission lead screw is located the part both sides. According to the invention, the tapping efficiency and tapping quality of the die are ensured by the mutual matching of the tapping structure, the cooling structure and the transmission structure.
Description
Technical Field
The invention belongs to the technical field of dies, and particularly relates to an automobile part precision die with an in-die tapping cooling structure.
Background
At present, in the whole stamping industry, an in-mold tapping cooling system always puzzles manufacturers, particularly in automobile part manufacturers, all automobile part parts are high-strength steel plates or even ultrahigh-strength steel plates at present, a rotating shaft and a door lock system of automobile parts are provided with tapping products, most of products change the traditional single-process die into progressive die production for improving production efficiency, in-mold tapping equipment is added, hole flanging and tapping of the products are completed in a mold, when the products are subjected to hole flanging and enter a tapping process, tooth hole burning and screw tap temperature overhigh abrasion are often caused, so that torsion and thrust of the products cannot be met, and finally, inestimable economic loss is brought to a stamping manufacturer by a client.
At present, adopt oil, trachea to carry out the cooling of the interior tooth operation of attacking of mould usually, but the position of generally using oil or trachea to attack the tooth in the mould cools off, very easily leads to the sweeps or the oil of attacking the tooth to mix, leads to the later stage not well to clear up, and because oil has the consistency, glues the sweeps on attacking the tooth lead screw, leads to the trachea can't blow away the sweeps for attack the tooth position and keep clean and tidy, thereby influence automobile parts's the quality of attacking the tooth.
Disclosure of Invention
The invention aims to: the precision die is used for solving the problem that in the process of tapping the existing automobile parts, the existing automobile parts are cooled by using oil or air pipes in a matching mode, but the oil is easy to adhere scraps on a tapping screw rod, so that the tapping screw rod is influenced in tapping the automobile parts, and the precision die is provided with the in-die tapping cooling structure.
In order to achieve the purpose, the invention adopts the following technical scheme: an automobile part precision die with an in-die tapping cooling structure comprises an upper die base and a lower die base, wherein the upper die base is provided with a tapping structure, the lower die base is provided with a positioning seat, a plurality of cooling structures and a plurality of conveying structures, a pressure sensor is arranged in the positioning seat, a part is placed on the positioning seat, the positioning seat is provided with a plurality of positioning blocks, the positioning blocks are positioned on two sides of the part, the tapping structure comprises a rotary motor base, a connecting bearing and a tapping screw rod, the cooling structure comprises a pump body, a water spray pipe and a water inlet pipe, the conveying structure comprises a driving motor and a transmission screw rod, the driving motor is provided with a controller, the positioning seat is provided with a mounting groove, the driving motor is mounted in the mounting groove, the transmission screw rod penetrates through the positioning seat and is connected to the driving motor, the plurality of transmission screw rods are positioned on two sides of the part.
As a further description of the above technical solution:
the upper die base is provided with a guide pillar, the lower die base is provided with a guide groove body, and the guide pillar corresponds to the guide groove body.
As a further description of the above technical solution:
the upper die base is provided with a plurality of connecting columns, and the connecting columns are connected to the lifting mechanism in a threaded mode.
As a further description of the above technical solution:
the quantity of locating piece has 2, 2 enclose between the locating piece and keep off and form the constant head tank, the part is located in the constant head tank.
As a further description of the above technical solution:
the water spraying device is characterized in that a pipe groove is formed in the lower die base, the water inlet pipe is installed in the pipe groove, the pump body is connected to the water inlet pipe, and the water spraying pipe is connected to the pump body.
As a further description of the above technical solution:
the spray pipes are in an arc shape which is bent downwards, and the spray pipes face the positioning grooves.
As a further description of the above technical solution:
the periphery of the positioning block is provided with a water collecting tank, a drain pipe is arranged in the lower die seat, and the water collecting tank is communicated with the drain pipe.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
in the invention, a conveying structure and a cooling structure are arranged on a lower die base, a tapping structure is arranged on an upper die base, the conveying structure comprises a driving motor and a transmission screw rod, the cooling structure comprises a pump body, a water inlet pipe and a water spray pipe, a part is placed in a positioning groove, the upper die base descends under the driving of a lifting mechanism, the tapping screw rod is driven by the rotating motor to rotate so as to tap the part, the lower die base is not stressed after tapping, a pressure sensor in the lower die base transmits a signal to a controller, the controller controls the driving motor to drive the transmission screw rod to convey, the transmission screw rod is matched with a rotating screw rod arranged at the relative position of the transmission screw rod so as to move the part forwards, meanwhile, the water spray pipe sprays water towards the tapping position in the tapping process, the tapping position is cooled, and simultaneously, the cooled water enters a water drainage pipe along a water collection groove to be discharged, the height of spray pipe is less than the height of leading positive cell body, when avoiding the upper die base to push down, damages the spray pipe, and the oil cooling has been avoided in the design of this structure for the sweeps glues on attacking the tooth lead screw, influences the efficiency of attacking the tooth and the quality of attacking the tooth.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a front view of an automotive part precision mold with an in-mold tapping cooling structure.
FIG. 2 is a top view of a lower die holder in an automobile part precision die with an in-die tapping cooling structure.
Fig. 3 is a schematic structural diagram of a spray pipe in an automobile part precision mold with an in-mold tapping and cooling structure.
Illustration of the drawings:
1-an upper die holder; 2-a lower die holder; 3, tapping structure; 31-a rotating motor base; 32-connecting bearings; 33-tapping screw rod; 4-positioning seat; 5-a cooling structure; 51-a pump body; 52-water spray pipe; 53-water inlet pipe; 6-a transfer structure; 61-a drive motor; 62-a transmission screw rod; 7-a pressure sensor; 8-parts; 9-positioning blocks; 10-a controller; 11-mounting grooves; 12-a guide post; 13-a guide groove body; 14-connecting column; 15-positioning grooves; 16-a water collection tank; 17-a drain pipe.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
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 invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "upper", "inner", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides an automobile parts precision mould with attack tooth cooling structure in mould, includes upper die base 1 and die holder 2, be provided with on the upper die base 1 and attack tooth structure 3, be provided with positioning seat 4, a plurality of cooling structure 5 and a plurality of conveying structure 6 on the die holder 2, be provided with pressure sensor 7 in the positioning seat 4, part 8 is placed on the positioning seat 4, be provided with a plurality of locating piece 9 on the positioning seat 4, locating piece 9 is located the both sides of part 8, attack tooth structure 3 and include rotating electrical machines seat 31, coupling bearing 32 and attack tooth lead screw 33, cooling structure 5 includes the pump body 51, spray pipe 52 and inlet tube 53, conveying structure 6 includes driving motor 61 and drive lead screw 62, be provided with controller 10 on the driving motor 61, be provided with mounting groove 11 on the positioning seat 4, driving motor 61 installs in mounting groove 11, the transmission screw rods 62 penetrate through the positioning seat 4 and are connected to the driving motor 61, and the transmission screw rods 62 are located on two sides of the part 8.
The upper die holder 1 is provided with a guide pillar 12, the lower die holder 2 is provided with a guide groove body 13, and the guide pillar 12 corresponds to the guide groove body 13. Ensure the guiding between the upper die holder and the lower die holder.
The upper die holder 1 is provided with a plurality of connecting columns 14, and the connecting columns 14 are in threaded connection with the lifting mechanism.
The quantity of locating piece 9 has 2, 2 enclose between the locating piece 9 and keep off and form constant head tank 15, part 8 is located in constant head tank 15. The part is positioned, and the part is prevented from displacing in the tapping process.
The lower die holder 2 is provided with a pipe groove, the water inlet pipe 53 is installed in the pipe groove, the pump body 51 is connected to the water inlet pipe 53, and the water spray pipe 52 is connected to the pump body 51. Water is pumped into the pump body, so that the water has certain injection pressure through the water spray pipe, and the water can be accurately injected at the tapping position through the water spray pipe.
The spray pipes 52 are curved downward, and a plurality of the spray pipes 52 face the positioning groove 15. The water of the water spray pipe can be accurately sprayed to the tapping position.
The periphery of the positioning block 9 is provided with a water collecting tank 16, a drain pipe 17 is arranged in the lower die holder 2, and the water collecting tank 16 is communicated with the drain pipe 17. The water at the tapping position can be discharged in time by spraying, and the influence on the normal use of the die caused by the flowing of excessive water to other places is avoided.
The water catch bowl 16 is provided with the filter screen with the drain pipe intercommunication department, filters the sweeps, prevents that the sweeps from blockking up in the drain pipe, influences the cooling work of mould.
The working principle is as follows: the lower die base is provided with a conveying structure and a cooling structure, the upper die base is provided with a tapping structure, the conveying structure comprises a driving motor and a transmission screw rod, the cooling structure comprises a pump body, a water inlet pipe and a water spray pipe, a part is placed in a positioning groove, the upper die base descends under the driving of a lifting mechanism, the tapping screw rod is driven by the rotating motor to rotationally drive, so that the part is tapped, the lower die base is not stressed after tapping is completed, a pressure sensor in the lower die base transmits a signal to a controller, the controller controls the driving motor to drive the transmission screw rod to convey, the transmission screw rod is matched with a rotating screw rod arranged at the relative position of the transmission screw rod to move the part forwards, meanwhile, the water spray pipe sprays water towards the tapping position in the tapping process, the tapping position is cooled, and meanwhile, the cooled water enters a water drainage pipe along a water collection groove to be discharged, the height of spray pipe is less than the height of leading positive cell body, when avoiding the upper die base to push down, damages the spray pipe, and the oil cooling has been avoided in the design of this structure for the sweeps glues on attacking the tooth lead screw, influences the efficiency of attacking the tooth and the quality of attacking the tooth.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (7)
1. The precise mold for the automobile parts with the in-mold tapping cooling structure is characterized by comprising an upper mold base (1) and a lower mold base (2), wherein the upper mold base (1) is provided with a tapping structure (3), the lower mold base (2) is provided with a positioning seat (4), a plurality of cooling structures (5) and a plurality of conveying structures (6), a pressure sensor (7) is arranged in the positioning seat (4), a part (8) is placed on the positioning seat (4), a plurality of positioning blocks (9) are arranged on the positioning seat (4), the positioning blocks (9) are positioned on two sides of the part (8), the tapping structure (3) comprises a rotating motor base (31), a connecting bearing (32) and a tapping screw rod (33), the cooling structure (5) comprises a pump body (51), a water spray pipe (52) and a water inlet pipe (53), conveying structure (6) include driving motor (61) and transmission lead screw (62), be provided with controller (10) on driving motor (61), be provided with mounting groove (11) on positioning seat (4), driving motor (61) are installed in mounting groove (11), transmission lead screw (62) are passed positioning seat (4) are connected on driving motor (61), a plurality of transmission lead screw (62) are located part (8) both sides.
2. The precision mold for automobile parts with the in-mold tapping cooling structure as claimed in claim 1, wherein a guide post (12) is arranged on the upper mold base (1), a guide groove body (13) is arranged on the lower mold base (2), and the guide post (12) corresponds to the guide groove body (13).
3. The precision mold for automobile parts with the in-mold tapping and cooling structure as claimed in claim 1, wherein a plurality of connecting columns (14) are arranged on the upper mold base (1), and the connecting columns (14) are screwed on the lifting mechanism.
4. The precision mold for automobile parts with the in-mold tapping cooling structure as claimed in claim 1, wherein the number of the positioning blocks (9) is 2, 2 positioning blocks (9) are surrounded and blocked to form positioning grooves (15), and the part (8) is located in the positioning grooves (15).
5. The precision mold for automobile parts with the in-mold tapping cooling structure as claimed in claim 1, wherein a pipe groove is formed on the lower mold base (2), the water inlet pipe (53) is installed in the pipe groove, the pump body (51) is connected to the water inlet pipe (53), and the water spray pipe (52) is connected to the pump body (51).
6. The precision mold for automobile parts with in-mold tapping cooling structure as claimed in claim 1, wherein said water spray pipes (52) are in the shape of arc bent downwards, and a plurality of said water spray pipes (52) are all facing said positioning grooves (15).
7. The precision mold with the in-mold tapping cooling structure for the automobile parts as claimed in claim 1, wherein a water collecting tank (16) is disposed around the positioning block (9), a water draining pipe (17) is disposed in the lower mold base (2), and the water collecting tank (16) is communicated with the water draining pipe (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210200505.7A CN114643307A (en) | 2022-03-01 | 2022-03-01 | Automobile part precision mold with in-mold tapping cooling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210200505.7A CN114643307A (en) | 2022-03-01 | 2022-03-01 | Automobile part precision mold with in-mold tapping cooling structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114643307A true CN114643307A (en) | 2022-06-21 |
Family
ID=81993345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210200505.7A Pending CN114643307A (en) | 2022-03-01 | 2022-03-01 | Automobile part precision mold with in-mold tapping cooling structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114643307A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10109225A (en) * | 1996-10-03 | 1998-04-28 | Murata Mach Ltd | Turret punch press |
| CN103192143A (en) * | 2013-04-24 | 2013-07-10 | 广州市毅峰汽配制造有限公司 | Workpiece tapping machine |
| CN108637224A (en) * | 2018-05-02 | 2018-10-12 | 益阳仪纬科技有限公司 | A kind of aluminium alloy mold for making toe-in of automobile controller |
| CN109807408A (en) * | 2019-02-19 | 2019-05-28 | 深圳市禾凯五金制品有限公司 | A kind of tapping device for shaft processing |
| CN110369611A (en) * | 2019-07-24 | 2019-10-25 | 深圳数码模汽车技术有限公司 | A kind of stamping die and cooling means with adaptive cooling body |
| CN210648874U (en) * | 2019-08-06 | 2020-06-02 | 马鞍山市瑞东仪表有限责任公司 | Fixing mechanism of tapping device of pressure transmitter |
| CN211162247U (en) * | 2019-11-25 | 2020-08-04 | 广州康欣五金制品有限公司 | Tapping device |
| CN212286172U (en) * | 2019-12-01 | 2021-01-05 | 武汉墨尔泰自动化设备有限公司 | Automatic tapping machine for feeding through vibrating disc |
| CN213672280U (en) * | 2020-11-27 | 2021-07-13 | 宋亚夺 | Tapping device in railway signal relay part mould |
-
2022
- 2022-03-01 CN CN202210200505.7A patent/CN114643307A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10109225A (en) * | 1996-10-03 | 1998-04-28 | Murata Mach Ltd | Turret punch press |
| CN103192143A (en) * | 2013-04-24 | 2013-07-10 | 广州市毅峰汽配制造有限公司 | Workpiece tapping machine |
| CN108637224A (en) * | 2018-05-02 | 2018-10-12 | 益阳仪纬科技有限公司 | A kind of aluminium alloy mold for making toe-in of automobile controller |
| CN109807408A (en) * | 2019-02-19 | 2019-05-28 | 深圳市禾凯五金制品有限公司 | A kind of tapping device for shaft processing |
| CN110369611A (en) * | 2019-07-24 | 2019-10-25 | 深圳数码模汽车技术有限公司 | A kind of stamping die and cooling means with adaptive cooling body |
| CN210648874U (en) * | 2019-08-06 | 2020-06-02 | 马鞍山市瑞东仪表有限责任公司 | Fixing mechanism of tapping device of pressure transmitter |
| CN211162247U (en) * | 2019-11-25 | 2020-08-04 | 广州康欣五金制品有限公司 | Tapping device |
| CN212286172U (en) * | 2019-12-01 | 2021-01-05 | 武汉墨尔泰自动化设备有限公司 | Automatic tapping machine for feeding through vibrating disc |
| CN213672280U (en) * | 2020-11-27 | 2021-07-13 | 宋亚夺 | Tapping device in railway signal relay part mould |
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