CN210280437U - Plug-in all-welded ball valve necking processing equipment - Google Patents
Plug-in all-welded ball valve necking processing equipment Download PDFInfo
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- CN210280437U CN210280437U CN201920976354.8U CN201920976354U CN210280437U CN 210280437 U CN210280437 U CN 210280437U CN 201920976354 U CN201920976354 U CN 201920976354U CN 210280437 U CN210280437 U CN 210280437U
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- necking
- mould
- fixing device
- ball valve
- connecting plate
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Abstract
The utility model relates to the valve manufacturing field, and discloses an inserted all-welded ball valve necking processing device, which comprises a four-column hydraulic machine, a necking mould and an inserted mould fixing device; the necking mould comprises a cylindrical mould body; a radial end surface of the mould body is provided with a forming groove along the axial direction; the necking mould comprises an upper necking mould and a lower necking mould, and the upper necking mould is connected with the lower end of the fixed middle beam; the lower necking mould is connected with the upper end of the base; the upper necking mould and the lower necking mould are coaxially arranged, and the forming groove of the upper necking mould and the forming groove of the lower necking mould are oppositely arranged; the mould fixing device comprises an upper fixing device connected with the fixed middle beam and a lower fixing device connected with the base; the position of the upper fixing device and the position of the lower fixing device can be inserted and connected with the four-column hydraulic press. The utility model discloses a processing equipment is high-efficient, degree of automation is high, can guarantee the quality and the precision of ball valve throat.
Description
Technical Field
The utility model relates to a valve processing technology field, concretely relates to bayonet all-welded ball valve throat processing equipment.
Background
Compared with the traditional cast steel ball valve, the all-welded ball valve adopts the integral welded ball valve formed by pressing the carbon steel seamless steel tube, can bear frequent operation under the condition of impurities and chemical substances, has long service life, and does not have the phenomena of external leakage and the like. Sometimes in order to use needs, the all-welded ball valve is used for holding spheroidal valve body both ends and need carry out the throat, but throat equipment automation degree on the existing market is low, efficiency and position accuracy are also lower to the convenient throat processing that can only carry out fixed size ball valve body of same equipment, in addition because each structural connection mode is fixed on the equipment, the loading and unloading is inconvenient, thereby has restricted the production and the use of the all-welded ball valve that have the throat.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the above-mentioned technical problem who exists among the prior art, provide a loading and unloading convenience, the high bayonet all-welded ball valve throat processing equipment of degree of automation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a kind of plug-in all welded ball valve throat processing unit, including four-column hydraulic press, throat clamping fixture and plug-in clamping fixture;
the four-column hydraulic machine comprises an upper cross beam, a base and a hydraulic pump working box; a plurality of guide columns are arranged between the upper cross beam and the base; a hydraulic tank is arranged at the top end of the upper cross beam, and a liquid pressure transmission pipe is arranged between the hydraulic pump working tank and the hydraulic tank; a telescopic hydraulic cylinder is embedded in one side of the upper cross beam opposite to the hydraulic tank, and the bottom end of the telescopic hydraulic cylinder is connected with a fixed middle beam;
the necking mould comprises a cylindrical mould body; a radial end surface of the mould body is provided with a forming groove along the axial direction; the necking mould comprises an upper necking mould and a lower necking mould, and the upper necking mould is connected with the lower end of the fixed middle beam; the lower necking mould is connected with the upper end of the base; the upper necking mould and the lower necking mould are coaxially arranged, and the forming groove of the upper necking mould and the forming groove of the lower necking mould are oppositely arranged;
the clamping fixture fixing device comprises an upper fixing device connected with the fixed middle beam and a lower fixing device connected with the base; and the position of the upper fixing device and the position of the lower fixing device are respectively inserted into the four-column hydraulic machine.
Furthermore, a positioning ring groove is formed in the middle of the outer wall of the mould body along the circumferential direction; the forming groove comprises a straight wall matched with the outer wall of the ball valve body and a positioning body matched with the inner wall of the ball valve body; an arc inner wall for forming a necking of the ball valve is arranged below the straight wall; the arc inner wall and the straight wall are connected into a whole; and a plurality of threaded connecting holes are uniformly distributed in the circumferential direction on the other radial end surface of the mould body.
Furthermore, two rows of L-shaped baffles I used for supporting the upper fixing device are arranged at the lower end of the fixed middle beam, and each baffle I comprises a first vertical part for limiting the upper fixing device in the horizontal direction and a first horizontal part for supporting the upper fixing device in the vertical direction; the first vertical part is welded with the bottom of the fixed middle beam, and the first horizontal part is provided with a threaded hole.
Further, the upper fixing device comprises an upper connecting plate; the bottom of the upper connecting plate is connected with the upper necking mould through the threaded connecting hole.
Furthermore, a plurality of upper positioning structures clamped with the positioning ring grooves are arranged on the periphery of the upper necking mould; the upper positioning structure comprises an upper positioning plate, and the upper positioning plate is in threaded connection with the upper connecting plate.
Furthermore, the upper connecting plate is arranged above the two rows of baffle plates I, and a first tightening screw for reinforcing the upper connecting plate is arranged on the horizontal part I.
Furthermore, two rows of L-shaped baffles II for being inserted into the lower fixing devices are arranged at the upper ends of the bases, and each baffle II comprises a vertical part II for limiting the lower fixing devices in the horizontal direction and a horizontal part II for limiting the lower fixing devices in the vertical direction; the vertical part II is welded with the upper end of the base, and the horizontal part II is provided with a threaded hole.
Further, the lower fixing device comprises a lower connecting plate; the top of the lower connecting plate is connected with the lower necking mould through the threaded connecting hole.
Furthermore, a plurality of lower positioning structures clamped with the positioning ring grooves are arranged on the periphery of the lower necking mould; the lower positioning structure comprises a lower positioning plate, and the lower positioning plate and the lower connecting plate are connected into a whole through threads.
Furthermore, the lower connecting plate is arranged between the two rows of second baffle plates, and a second tightening screw for reinforcing the lower connecting plate is arranged on the horizontal part downwards.
The utility model has the advantages and positive effects that:
the necking mould and the mould fixing device are arranged on the four-column hydraulic press, so that the high-efficiency and automatic production of the necking ball valve can be realized; in addition, the upper clamping fixture fixing device can ensure the position precision of the ball valve in the necking processing process, and the processing quality is ensured; the pluggable clamping fixture fixing structure can be conveniently assembled and disassembled with a four-column hydraulic machine, and the clamping fixture fixing structure is suitable for machining ball valve bodies of different sizes and is good in interchangeability.
Description of the drawings:
FIG. 1 is a front view of a ball valve body before necking in the preferred embodiment of the present invention;
FIG. 2 is a front view of the ball valve body after necking in the preferred embodiment of the present invention;
FIG. 3 is a front view of a four-column hydraulic machine in example 1;
FIG. 4 is a front view of the necking die of example 1;
FIG. 5 is a top view of the necking die of example 1;
FIG. 6 is a bottom view of the necking die of example 1;
FIG. 7 is a front view of an all-welded ball valve necking processing apparatus in embodiment 1;
FIG. 8 is a front view of an all-welded ball valve necking processing apparatus in embodiment 2;
FIG. 9 is a schematic view showing the construction of an upper positioning plate in embodiment 2;
FIG. 10 is a front view of an all-welded ball valve necking processing apparatus in embodiment 3;
FIG. 11 is an enlarged partial view of the upper fixture of FIG. 10;
fig. 12 is an enlarged view of a portion of the lower fixture of fig. 10.
Wherein: 1. a four-column hydraulic press; 1-1, an upper beam; 1-2, a base; 1-3, a hydraulic pump work box; 1-4, a hydraulic tank; 1-5, a liquid pressure transmission pipe; 1-6, a telescopic hydraulic cylinder; 1-7, fixing the middle beam; 1-8, a guide post;
2. necking mould; 2-1, a mould body; 2-2, a positioning ring groove; 2-3, forming grooves; 2-31, straight wall; 2-32, arc inner wall; 2-4, a positioning body; 2-5, connecting a threaded hole; 2-6, an upper necking mould; 2-7, a lower necking mould;
3. an upper fixing device; 3-1, connecting column; 3-2, arranging a positioning plate; 3-21, arc surface; 3-22, an upper connecting hole; 3-3, an upper connecting plate; 3-4, connecting a bolt I; 3-5, a first baffle; 3-51, vertical part one; 3-52 and a horizontal part I; 3-6, screwing the first screw;
4. a lower fixing device; 4-1, a lower connecting column; 4-2, a lower positioning plate; 4-3, a lower connecting plate; 4-4, connecting a second bolt; 4-5, a second baffle; 4-51, vertical part two; 4-52 and a horizontal part II; 4-6, tightening a second screw;
5. a ball valve body.
Detailed Description
The necking processing equipment of the utility model processes the ball valve body 5 of figure 1 into the shape shown in figure 2;
for further understanding of the contents, features and functions of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:
as shown in fig. 3 to 12, the utility model discloses an insertion type all-welded ball valve necking processing device, which comprises a four-column hydraulic press 1, a necking mould 2 and a mould fixing device;
the four-column hydraulic machine 1 comprises an upper beam 1-1, a base 2 and a hydraulic pump working box 1-3 which can control the working stroke of the hydraulic machine; a plurality of guide columns 21-8 are arranged between the upper cross beam 1-1 and the base 2; a hydraulic tank 1-4 is arranged at the top end of the upper cross beam 1-1, and a liquid pressure transmission pipe 1-5 is arranged between the hydraulic pump working tank 1-3 and the hydraulic tank 1-4; a telescopic hydraulic cylinder 1-6 is embedded in one side of the upper cross beam 1-1 opposite to the hydraulic tank 1-4, and the bottom end of the telescopic hydraulic cylinder 1-6 is connected with a fixed middle beam 1-7;
the necking mould 2 comprises a cylindrical mould body 2-1; a positioning ring groove 2-2 is formed in the middle of the outer wall of the mould body 2-1 along the circumferential direction; a radial end face of the mould body 2-1 is provided with a forming groove 2-3 along the axial direction; the forming groove 2-3 comprises a straight wall 2-31 matched with the outer wall of the ball valve body 5 and a positioning body 2-4 matched with the inner wall of the ball valve body 5; an arc inner wall 2-32 for forming a ball valve necking is arranged below the straight wall 2-31; the arc inner walls 2-32 and the straight walls 2-31 are connected into a whole; the positioning body 2-4 is a cylindrical body arranged at the center of the forming groove 2-3, and the diameter of the positioning body 2-4 is matched with that of the inner wall of the ball valve body 5; a plurality of threaded connecting holes 2-5 are uniformly distributed on the other radial end face of the mould body 2-1 in the circumferential direction;
the necking mould 2 comprises an upper necking mould 2-6 and a lower necking mould 2-7, and the upper necking mould 2-6 is connected with the lower end of the fixed middle beam 1-7; the lower necking mould 2-7 is connected with the upper end of the base 2; the upper necking mould 2-6 and the lower necking mould 2-7 are coaxially arranged, and the forming groove of the upper necking mould 2-6 is opposite to the forming groove of the lower necking mould 2-7;
the mould fixing device comprises an upper fixing device 3 connected with the fixed middle beams 1-7 and a lower fixing device 4 connected with the base 2; the upper fixing device 3 and the lower fixing device 4 are fixed and non-detachable structures.
Specifically, the upper fixing device 3 comprises a plurality of upper connecting columns 3-1 uniformly arranged around an upper necking mould 2-6, the upper ends of the upper connecting columns 3-1 are welded with the lower ends of fixed middle beams 1-7, and the lower ends of the upper connecting columns 3-1 are welded with upper positioning plates 3-2; the upper positioning plate 3-2 is clamped with the positioning ring groove 2-2 of the upper necking mould 2-6; the contact part of the upper positioning plate 3-2 and the upper necking mould 2-6 is provided with an arc surface 3-21 matched with the positioning ring groove 2-2; the upper fixing device 3 ensures that the upper necking mould 2-6 is stably connected on the fixed middle beam 1-7 without displacement and falling off by clamping the upper necking mould 2-6.
The lower fixing device 4 comprises a plurality of lower connecting columns 4-1 which are uniformly arranged around a lower necking mould 2-7, the lower ends of the lower connecting columns 4-1 are welded with the upper end of the base 2, and the upper ends of the lower connecting columns 4-1 are welded with lower positioning plates 4-2 which have the same structures as the upper positioning plates 3-2; the lower positioning plate 4-2 is clamped with the positioning ring groove 2-2 of the lower necking mould 2-7; the contact part of the lower positioning plate 4-2 and the lower necking mould 2-7 is provided with an arc surface 3-21 matched with the positioning ring groove 2-2; the lower fixing device 4 ensures that the lower necking dies 2-7 are stably connected on the base 2 and do not shift by clamping the lower necking dies 2-7.
Example 2:
in the embodiment, only the upper fixing device 3 and the lower fixing device 4 are designed into structures convenient for installation and disassembly, and the structures of other parts are the same as those of the first embodiment;
specifically, the upper fixing device 3 comprises an upper connecting plate hole 3-3 connected with a fixed middle beam 1-7; the bottoms of the upper connecting plate holes 3-3 are connected with an upper necking mould 2-6 through the threaded connecting holes 2-5; a plurality of upper positioning structures clamped with the positioning ring grooves 2-2 are arranged around the upper necking mould 2-6; the upper positioning structure comprises an upper positioning plate 3-2, and a circular arc surface 3-21 matched with the positioning ring groove 2-2 is arranged at the contact part of the upper positioning plate 3-2 and the upper necking mould 2-6; in addition, an upper connecting hole 3-22 is formed in the upper positioning plate 3-2; the lower end face of the fixed middle beam 1-7 is provided with a through T-shaped groove corresponding to the upper connecting hole 3-22; the fixed middle beam 1-7 is connected with the upper positioning plate 3-2 through a connecting bolt I3-4; specifically, a nut of the first connecting bolt 3-4 is arranged in the T-shaped groove, and a screw rod of the first connecting bolt 3-4 is connected with a threaded hole of the upper positioning plate 3-2; the bottom of the upper positioning plate 3-2 is provided with a nut for screwing a first connecting bolt 3-4;
the lower fixing device 4 comprises a lower connecting plate 4-3 in threaded connection with the base 2; the top of the lower connecting plate 4-3 is connected with a lower necking mould 2-7 through the threaded connecting hole 2-5; a plurality of lower positioning structures clamped with the positioning ring grooves 2-2 are arranged around the lower necking mould 2-7; the lower positioning structure comprises a lower positioning plate 4-2, and a circular arc surface 3-21 matched with the positioning ring groove 2-2 is also arranged at the contact part of the lower positioning plate 4-2 and the lower necking mould 2-7; in addition, the lower positioning plate 4-2 is also provided with a lower connecting hole; a threaded hole is formed in the position, corresponding to the lower connecting hole, of the lower connecting plate 4-3; a second connecting bolt 4-4 and a matched nut are arranged between the connecting hole and the threaded hole;
preferably, the upper connecting holes 3-22 and the lower connecting holes are all long holes; therefore, the positions of the upper and lower positioning plates 4-2 can be adjusted along the radial direction of the necking mould, thereby being suitable for necking moulds with different diameters.
Example 3:
in the embodiment, the structure of the upper fixing device 3 and the lower fixing device 4 is improved to be connected with the four-column hydraulic press 1 in an inserting way on the basis of the adjustable structure, and the structures of other parts are the same as those of the embodiment;
preferably, the upper fixing device 3 comprises an upper connecting plate hole 3-3; the bottoms of the upper connecting plate holes 3-3 are connected with an upper necking mould 2-6 through the threaded connecting holes 2-5; a plurality of upper positioning structures clamped with the positioning ring grooves 2-2 are arranged around the upper necking mould 2-6; the upper positioning structure comprises an upper positioning plate 3-2, and the upper positioning plate 3-2 and the upper connecting plate hole 3-3 are connected into a whole through threads; the contact part of the upper positioning plate 3-2 and the upper necking mould 2-6 is provided with an arc surface 3-21 matched with the positioning ring groove 2-2; two rows of L-shaped baffle plates 3-5 for supporting the upper fixing device 3 are arranged at the lower ends of the fixed middle beams 1-7, and each baffle plate 3-5 comprises a vertical part 3-51 for limiting the upper connecting plate hole 3-3 in the horizontal direction and a horizontal part 3-52 for supporting the upper connecting plate hole 3-3 in the vertical direction; the vertical part I3-51 is welded with the bottom of the fixed middle beam 1-7, and the horizontal part I3-52 is provided with a threaded hole; when the device is installed, the upper connecting plate holes 3-3 connected with the upper necking clamping tools 2-6 are placed on the two rows of baffle plates 3-5, and the horizontal parts 3-52 are provided with the screwing screws 3-6 to reinforce the upper connecting plate holes 3-3;
similarly, the lower fixing device 4 comprises a lower connecting plate 4-3; the top of the lower connecting plate 4-3 is connected with a lower necking mould 2-7 through the threaded connecting hole 2-5; a plurality of lower positioning structures clamped with the positioning ring grooves 2-2 are arranged around the lower necking mould 2-7; the lower positioning structure comprises a lower positioning plate 4-2, and the lower positioning plate 4-2 and the lower connecting plate 4-3 are connected into a whole through threads; the contact part of the lower positioning plate 4-2 and the lower necking mould 2-7 is also provided with an arc surface 3-21 matched with the positioning ring groove 2-2; two rows of L-shaped baffle plates 4-5 inserted with the lower fixing device are arranged at the upper end of the base 2, and each baffle plate 4-5 comprises a vertical part 4-51 for limiting the lower connecting plate 4-3 in the horizontal direction and a horizontal part 4-52 for limiting the lower connecting plate 4-3 in the vertical direction; the vertical part II 4-51 is welded with the upper end of the base 2, and the horizontal part II 4-52 is provided with a threaded hole; when the device is installed, the lower connecting plate 4-3 connected with the lower necking clamping fixture 2-7 is placed between the two rows of baffle plates 4-5, and the horizontal part is downwards provided with a screwing screw II 4-6 to reinforce the lower connecting plate 4-3;
the utility model discloses an go up fixing device 3 and fixing device 4 replacement of the necking mould of being convenient for down, the installation is simple and convenient with the maintenance, also can be applicable to the necking mould of different diameters.
The working principle is as follows:
placing a ball valve body 5 to be necked in a lower necking mould 2-7 for positioning, starting a four-column hydraulic machine 1, and driving a hydraulic tank 1-4 to work by a hydraulic pump working tank 1-3 through a hydraulic pressure transmission pipe 1-5; the telescopic hydraulic cylinder 1-6 drives the fixed middle beam 1-7 to move downwards until the upper necking mould 2-6 contacts with the ball valve body 5 to be necked, and the upper end and the lower end of the ball valve body 5 to be necked form a necking under the action of the necking mould along with the continuous descending of the fixed middle beam 1-7; and after the telescopic hydraulic cylinders 1-6 return to the proper position, taking down the processed ball valve body 5.
The embodiments of the present invention have been described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (10)
1. The utility model provides a bayonet all-welded ball valve throat processing equipment which characterized in that: comprises a four-column hydraulic press, a necking mould and an inserted mould fixing device;
the four-column hydraulic machine comprises an upper cross beam, a base and a hydraulic pump working box; a plurality of guide columns are arranged between the upper cross beam and the base; a hydraulic tank is arranged at the top end of the upper cross beam, and a liquid pressure transmission pipe is arranged between the hydraulic pump working tank and the hydraulic tank; a telescopic hydraulic cylinder is embedded in one side of the upper cross beam opposite to the hydraulic tank, and the bottom end of the telescopic hydraulic cylinder is connected with a fixed middle beam;
the necking mould comprises a cylindrical mould body; a radial end surface of the mould body is provided with a forming groove along the axial direction; the necking mould comprises an upper necking mould and a lower necking mould, and the upper necking mould is connected with the lower end of the fixed middle beam; the lower necking mould is connected with the upper end of the base; the upper necking mould and the lower necking mould are coaxially arranged, and the forming groove of the upper necking mould and the forming groove of the lower necking mould are oppositely arranged;
the clamping fixture fixing device comprises an upper fixing device connected with the fixed middle beam and a lower fixing device connected with the base; and the position of the upper fixing device and the position of the lower fixing device are respectively inserted into the four-column hydraulic machine.
2. An insertion type all-welded ball valve necking processing device according to claim 1, wherein: a positioning ring groove is formed in the middle of the outer wall of the mould body along the circumferential direction; the forming groove comprises a straight wall matched with the outer wall of the ball valve body and a positioning body matched with the inner wall of the ball valve body; an arc inner wall for forming a necking of the ball valve is arranged below the straight wall; the arc inner wall and the straight wall are connected into a whole; and a plurality of threaded connecting holes are uniformly distributed in the circumferential direction on the other radial end surface of the mould body.
3. An insertion type all-welded ball valve necking processing device according to claim 1, wherein: the lower end of the fixed middle beam is provided with two rows of L-shaped baffle plates I for supporting the upper fixing device, and each baffle plate I comprises a vertical part I for limiting the upper fixing device in the horizontal direction and a horizontal part I for supporting the upper fixing device in the vertical direction; the first vertical part is welded with the bottom of the fixed middle beam, and the first horizontal part is provided with a threaded hole.
4. An insertion type all-welded ball valve necking processing device according to claim 2, wherein: the upper fixing device comprises an upper connecting plate; the bottom of the upper connecting plate is connected with the upper necking mould through the threaded connecting hole.
5. An insertion type all-welded ball valve necking processing device according to claim 4, wherein: a plurality of upper positioning structures clamped with the positioning ring grooves are arranged on the periphery of the upper necking mould; the upper positioning structure comprises an upper positioning plate, and the upper positioning plate is in threaded connection with the upper connecting plate.
6. An insertion type all-welded ball valve necking processing device according to claim 4, wherein: the upper connecting plate is inserted into the two rows of baffle plates, and a first tightening screw for reinforcing the upper connecting plate is arranged on the horizontal part I.
7. An insertion type all-welded ball valve necking processing device according to claim 2, wherein: two rows of L-shaped baffle plates II for inserting with the lower fixing device are arranged at the upper end of the base, and each baffle plate II comprises a vertical part II for limiting the lower fixing device in the horizontal direction and a horizontal part II for limiting the lower fixing device in the vertical direction; the vertical part II is welded with the upper end of the base, and the horizontal part II is provided with a threaded hole.
8. An insertion type all-welded ball valve necking processing device according to claim 7, wherein: the lower fixing device comprises a lower connecting plate; the top of the lower connecting plate is connected with the lower necking mould through the threaded connecting hole.
9. An insertion type all-welded ball valve necking processing device according to claim 8, wherein: a plurality of lower positioning structures clamped with the positioning ring grooves are arranged on the periphery of the lower necking mould; the lower positioning structure comprises a lower positioning plate, and the lower positioning plate and the lower connecting plate are connected into a whole through threads.
10. An insertion type all-welded ball valve necking processing device according to claim 8, wherein: the lower connecting plate is inserted with the two rows of baffles II; and a second tightening screw for reinforcing the lower connecting plate is arranged downwards on the horizontal part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920976354.8U CN210280437U (en) | 2019-06-25 | 2019-06-25 | Plug-in all-welded ball valve necking processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920976354.8U CN210280437U (en) | 2019-06-25 | 2019-06-25 | Plug-in all-welded ball valve necking processing equipment |
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| Publication Number | Publication Date |
|---|---|
| CN210280437U true CN210280437U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920976354.8U Expired - Fee Related CN210280437U (en) | 2019-06-25 | 2019-06-25 | Plug-in all-welded ball valve necking processing equipment |
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| CN (1) | CN210280437U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115532954A (en) * | 2022-12-02 | 2022-12-30 | 沈阳铁路信号有限责任公司 | Hydraulic pipe fitting necking sealing device and method |
-
2019
- 2019-06-25 CN CN201920976354.8U patent/CN210280437U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115532954A (en) * | 2022-12-02 | 2022-12-30 | 沈阳铁路信号有限责任公司 | Hydraulic pipe fitting necking sealing device and method |
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