CN111456978A - Ultrahigh pressure proportional unloading valve - Google Patents
Ultrahigh pressure proportional unloading valve Download PDFInfo
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- CN111456978A CN111456978A CN202010431700.1A CN202010431700A CN111456978A CN 111456978 A CN111456978 A CN 111456978A CN 202010431700 A CN202010431700 A CN 202010431700A CN 111456978 A CN111456978 A CN 111456978A
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- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 238000007667 floating Methods 0.000 claims abstract description 31
- 210000004907 gland Anatomy 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 34
- 210000001503 joint Anatomy 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 9
- 239000010720 hydraulic oil Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000462 isostatic pressing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to the technical field of unloading valves, in particular to an ultrahigh pressure proportional unloading valve, and aims to solve the technical problem that the pressure of a system is not proportional to the time in the later pressure relief period of an existing isostatic pressure cavity. The following technical scheme is adopted: include from supreme main pressure relief mechanism who sets gradually down, guide control mechanism, hydraulic drive mechanism, main pressure relief mechanism includes lower valve body, the disk seat, the floating spool, guide control mechanism includes the valve body, fixed spool, the current-limiting spool, hydraulic drive mechanism includes the piston, the piston gland, main pressure relief mechanism is used for assuming the most task of pressure release, guide control mechanism mainly is used for controlling main pressure relief mechanism, only guide control mechanism starts main pressure relief mechanism and just can start, and be the continuous formula of slowing down to main pressure relief mechanism's regulation mode, avoided because main pressure relief mechanism and the direct butt joint of hydraulic drive mechanism lead to the pressure release assault too big, thereby the life of off-load valve has been guaranteed.
Description
Technical Field
The invention relates to the technical field of unloading valves, in particular to an ultrahigh pressure proportional unloading valve.
Background
Isostatic presses often require a controlled reduction of the working pressure in proportion to time during use. The prior art generally adopts the following method for pressure relief: the isostatic pressing cavity is provided with a discharge port with a fixed size, a switch for controlling the opening and the closing of the isostatic pressing cavity is arranged, and liquid in the cavity is subjected to stepped pressure relief along with time by opening the discharge port. However, the above method has certain disadvantages: along with the reduction of system pressure, the liquid velocity of flow of emission can reduce to system pressure and the time that leads to the work later stage can not carry out the pressure release in proportion, can't satisfy the industrial demand.
Disclosure of Invention
The invention aims to solve the technical problem that the pressure and the time of a system are not proportional in the later pressure relief period of the existing isostatic pressure cavity.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the ultrahigh pressure proportional unloading valve comprises a main pressure relief mechanism (for bearing the main pressure relief effect), a pilot control mechanism (for the premise of the work of the main pressure relief mechanism, the pilot control effect on the main pressure relief mechanism is achieved), and a hydraulic drive mechanism (for the adjustment power of the whole unloading valve, the state of the unloading valve can be changed by changing the input hydraulic pressure); the main pressure relief mechanism comprises a lower valve body, a valve seat and a floating valve core, wherein the middle part of the lower valve body is provided with a first through hole with an axis arranged up and down, the first through hole is a first-stage stepped hole with a large-diameter hole positioned below, the valve seat is in threaded connection with the large-diameter hole of the first through hole, the side wall of the top of the valve seat is in sealing connection with the large-diameter hole wall of the first through hole, the valve seat is provided with a second through hole coaxial with the first through hole, the upper part of the second through hole is in sliding embedding with the floating valve core, the outer wall of the upper part of the floating valve core is in sealing connection with the inner wall of the second through hole, the diameter of the axial middle part of the second through hole is reduced to form a limiting part matched with the lower end face of the floating valve core, the floating valve core floats between the limiting part and the stepped face of the first through hole, the, the floating valve core is internally provided with a third through hole coaxial with the second through hole, a spring is arranged in the third through hole, and the diameter of the lower end of the third through hole is reduced to form a supporting part; the pilot control mechanism comprises an upper valve body, a fixed valve core and a flow limiting valve core, wherein the upper valve body is fixed at the upper end of a lower valve body in a sealing manner, the fixed valve core is clamped and fixed between the upper valve body and the lower valve body, two ends of a spring are respectively abutted against the fixed valve core and a supporting part, the upper valve body is provided with a fourth through hole coaxial with a third through hole, the fixed valve core is provided with a fifth through hole coaxial with the fourth through hole, the upper part of the fixed valve core is arranged at the lower part of the fourth through hole, the flow limiting valve core is arranged in the fourth through hole, the flow limiting valve core is of a barrel-shaped structure with a downward opening, a gap is sleeved on the outer side of the upper part of the fixed valve core (the gap is sleeved for allowing liquid to flow through between the flow limiting valve core and the fixed valve core), a sealing cover body for sealing the fifth through hole is arranged between the flow, the second pressure relief channel is communicated with the flow limiting channel; the hydraulic driving mechanism comprises a piston and a piston gland, the piston gland is fixed at the upper end of the fourth through hole in a sealing mode, the piston is located between the piston gland and the flow limiting valve core and is abutted to the flow limiting valve core, and the piston gland is provided with an oil filling hole.
The invention has the beneficial effects that:
1) the ultrahigh pressure proportional unloading valve is provided with the hydraulic driving mechanism, and can control the pressure of liquid in the high-pressure cavity by controlling the pressure of hydraulic oil input into the hydraulic driving mechanism, so that controllable unloading is achieved;
2) according to the ultrahigh pressure proportional unloading valve, the pilot control mechanism is arranged between the hydraulic driving mechanism and the main pressure relief mechanism, the main pressure relief mechanism is used for bearing most of the tasks of pressure relief, the pilot control mechanism is mainly used for controlling the main pressure relief mechanism, the main pressure relief mechanism can be started only when the pilot control mechanism starts the main pressure relief mechanism, the adjusting mode of the main pressure relief mechanism is a continuous reducing mode, the phenomenon that pressure relief impact is overlarge due to the fact that the main pressure relief mechanism is directly butted with the hydraulic driving mechanism is avoided, and therefore the service life of the unloading valve is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an ultrahigh pressure proportional unloading valve;
FIG. 2 is a view of FIG. 1
A partial enlargement of (a);
FIG. 3 is a view of FIG. 1
A partial enlargement of (c).
In the figure:
1 ┄ lower valve body; 2 ┄ valve seat; 3 ┄ floating spool; 4 ┄ a first pressure relief passage; 5 ┄ spring; 6 ┄ an upper valve body; 7 ┄ fixed valve core; 8 ┄ flow restriction valve core; 9 ┄ sealing the cover; 10 ┄ flow restricting passage; 11 ┄ second pressure relief passage; 12 ┄ piston; 13 ┄ piston gland; 14 ┄ oil holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1 to 3, an ultrahigh pressure proportional unloading valve includes a main pressure relief mechanism, a pilot control mechanism, and a hydraulic drive mechanism, which are sequentially arranged from bottom to top; the main pressure relief mechanism comprises a lower valve body 1, a valve seat 2 and a floating valve core 3, wherein a first through hole with an axis arranged up and down is arranged in the middle of the lower valve body 1, the first through hole is a first-stage stepped hole with a large-diameter hole positioned below, the valve seat 2 is in threaded connection with the large-diameter hole of the first through hole, the side wall of the top of the valve seat 2 is in sealing connection with the large-diameter hole wall of the first through hole, the sealing connection is a technology known by persons in the art, and a sealing ring and the like can be adopted for sealing during specific implementation; the valve seat 2 is provided with a second through hole coaxial with the first through hole, the upper part of the second through hole is embedded with the floating valve core 3 in a sliding way, the upper outer wall of the floating valve core 3 is connected with the inner wall of the second through hole in a sealing way, the sliding embedding belongs to the technology known by people in the field of machinery, the outer wall of the floating valve core 3 and the inner wall of the second through hole can be matched in a clearance way during specific implementation, and the sealing connection is realized by embedding a sealing ring on the outer wall of the floating valve core 3 or the inner wall of the second through hole; the diameter of the axial middle part of the second through hole is reduced to form a limiting part matched with the lower end face of the floating valve core 3, and the limiting part are in sealed connection; the floating valve core 3 floats between the limiting part and the step surface of the first through hole, the lower valve body 1 and the valve seat 2 together form a first pressure relief channel 4, and the first pressure relief channel 4 can be processed into a straight shape in the figure or a bent shape or other shapes in specific implementation; the inner end of the first pressure relief channel 4 is adjacently arranged above the limiting part, a third through hole coaxial with the second through hole is arranged in the floating valve core 3, a spring 5 is placed in the third through hole, the diameter of the lower end of the third through hole is reduced to form a supporting part, and the supporting part is used for supporting the spring 5 and can be machined into a circular table surface or a plane and the like in a graph during specific implementation; the pilot control mechanism comprises an upper valve body 6, a fixed valve core 7 and a flow limiting valve core 8, wherein the upper valve body 6 is fixed at the upper end of the lower valve body 1 in a sealing manner, the sealing and fixing are well-known technologies of the technical field, and the specific implementation can be realized by matching a sealing ring with connecting structures such as threads, buckles, welding and the like; the fixed valve core 7 is clamped and fixed between the upper valve body 6 and the lower valve body 1, and the clamping and fixing can be realized by various structures known in the field during specific implementation, as long as the fixed valve core 7 is clamped in the middle through the upper valve body 6 and the lower valve body 1; the two ends of the spring 5 are respectively abutted against the fixed valve core 7 and the supporting part, the upper valve body 6 is provided with a fourth through hole coaxial with the third through hole, the fixed valve core 7 is provided with a fifth through hole coaxial with the fourth through hole, the upper part of the fixed valve core 7 is arranged at the lower part of the fourth through hole, the flow limiting valve core 8 is positioned in the fourth through hole, the flow limiting valve core 8 is of a barrel-shaped structure with a downward opening, the outer side of the upper part of the fixed valve core 7 is sleeved with a gap, a sealing cover body 9 for sealing the fifth through hole is arranged between the flow limiting valve core 8 and the fixed valve core 7 or integrated with the flow limiting valve core 8, and the sealing cover body 9 can be a part of the flow limiting valve core 8 or a part such as a sphere and the like which is independently arranged; a flow limiting channel 10 is formed between the flow limiting valve core 8 and the hole wall of the fourth through hole, a second pressure relief channel 11 is formed in the upper valve body 6, and the second pressure relief channel 11 can be arranged to be a straight channel or a curved channel as shown in the figure in specific implementation; the second pressure relief channel 11 is communicated with the flow limiting channel 10; the hydraulic driving mechanism comprises a piston 12 and a piston gland 13, the piston gland 13 is fixed at the upper end of the fourth through hole in a sealing mode, the piston 12 is located between the piston gland 13 and the flow limiting valve core 8 and is abutted to the flow limiting valve core 8, and the piston gland 13 is provided with an oil injection hole 14.
When the high-pressure cavity needs unloading, firstly, hydraulic oil with specific pressure is input into the hydraulic driving mechanism from the oil injection hole 14, the pressure of the input hydraulic oil is ensured to be smaller than the pressure required by the balance of the piston 12, at the moment, the sealing cover body 9, the flow-limiting valve core 8 and the piston 12 are regarded as a whole, the lower stress of the whole is larger than the upper stress, so the whole can move upwards to be separated from the upper end of the fifth through hole, liquid in the high-pressure cavity can sequentially pass through the second through hole, the third through hole, the first through hole, the fifth through hole, a gap between the fixed valve core 7 and the flow-limiting valve core 8, the flow-limiting channel 10 and the second pressure relief channel 11 and then be discharged, at the moment, the pressure of the hydraulic oil above the floating valve core 3 can be reduced, the upper stress of the floating valve core 3 is smaller than the lower stress, the floating valve core 3 can move upwards, so the inner, the liquid in the high-pressure cavity is discharged through the first pressure relief channel 4 to be relieved; when the pressure of the high-pressure cavity is reduced to a certain degree, so that the stress below the sealing cover body 9 is smaller than the stress above the sealing cover body, the piston 12, the flow limiting valve core 8 and the sealing cover body 9 can integrally move downwards to enable the sealing cover body 9 to seal the fifth through hole, the pilot control mechanism is closed, the floating valve core 3 moves to the limiting part under the action of the spring 5, the main pressure relief structure is closed, and pressure relief is stopped. The pressure of the hydraulic oil in the hydraulic control mechanism is adjusted, so that the pressure of the liquid in the high-pressure cavity is adjusted, and controllable pressure relief is realized.
Preferably, the fourth through hole is a first-stage stepped hole with a small diameter hole positioned below, the piston gland 13 is in threaded connection with the inner wall of the upper part of the large diameter hole of the fourth through hole, the piston 12 is a reducing piston consisting of a large diameter part and a small diameter part, the large diameter part of the piston 12 is positioned at the lower part of the large diameter hole of the fourth through hole and can slide between the piston gland 13 and the stepped surface of the fourth through hole, and the small diameter part of the piston 12 is positioned at the upper part of the small diameter hole of the fourth through hole and is abutted against the top surface of the flow limiting valve core 8.
Preferably, the flow limiting valve core 8 is provided with an external thread, a flow limiting channel 10 is formed between the external thread of the flow limiting valve core 8 and the inner wall of the fourth through hole, and the threaded flow limiting channel 10 is easy to process and stable in performance.
Furthermore, the fifth through hole is a first-level stepped hole with a small diameter hole positioned above, the sealing cover body 9 is spherical, the upper end surface of the fixed valve core 7 is arranged to be a spherical surface matched with the sealing cover body 9, the central shaft of the spherical surface is coaxial with the fifth through hole, and the structural matching of the stepped hole and the spherical sealing cover body 9 enables the stress area corresponding to liquid in the high-pressure cavity to be smaller, so that the pressure of the liquid in the required hydraulic driving mechanism becomes smaller, the control cost is lower, and the energy consumption is lower.
Preferably, the outer diameter of the lower end of the floating valve core 3 is reduced to form a circular truncated cone side surface, the limiting portion is the circular truncated cone side surface matched with the lower end of the floating valve core 3, the floating valve core 3 can move more smoothly due to the circular truncated cone side surface, the clamping condition cannot exist, and the sealing structure is favorably arranged.
Preferably, the lower part of the fixed valve core 7 is of a structure formed by two circular truncated cones which are coaxial and have opposite large-diameter bottom surfaces, the axis of the circular truncated cone of the fixed valve core 7 is coaxial with the first through hole, the diameters of the upper end of the first through hole and the lower end of the fourth through hole are increased to form a circular truncated cone-shaped flared part, and the lower part of the fixed valve core 7 is clamped and fixed in the two flared parts, so that the stress direction of the fixed valve core 7 is perpendicular to the direction of the side surface of the circular truncated cone and is not straight up or straight down, and the connection failure of the upper valve body 1 and the lower valve body due to the overlarge stress of.
The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. The ultrahigh pressure proportional unloading valve is characterized in that: the hydraulic pressure relief device comprises a main pressure relief mechanism, a pilot control mechanism and a hydraulic drive mechanism which are sequentially arranged from bottom to top; the main pressure relief mechanism comprises a lower valve body (1), a valve seat (2) and a floating valve core (3), wherein a first through hole with a vertical axis is arranged in the middle of the lower valve body (1), the first through hole is a first-stage stepped hole with a large-diameter hole positioned below, the valve seat (2) is in threaded connection with the large-diameter hole of the first through hole, the side wall of the top of the valve seat (2) is in sealed connection with the large-diameter hole wall of the first through hole, the valve seat (2) is provided with a second through hole coaxial with the first through hole, the floating valve core (3) is embedded in the upper part of the second through hole in a sliding manner, the outer wall of the upper part of the floating valve core (3) is in sealed connection with the inner wall of the second through hole, the axial middle diameter of the second through hole is reduced to form a limiting part matched with the lower end surface of the floating valve core (3) and the two are in sealed connection, the floating valve core (3) floats between the, the inner end of the first pressure relief channel (4) is adjacently arranged above the limiting part, a third through hole coaxial with the second through hole is arranged in the floating valve core (3), a spring (5) is arranged in the third through hole, and the diameter of the lower end of the third through hole is reduced to form a supporting part; the pilot control mechanism comprises an upper valve body (6), a fixed valve core (7) and a flow limiting valve core (8), wherein the upper valve body (6) is fixed at the upper end of a lower valve body (1) in a sealing way, the fixed valve core (7) is clamped and fixed between the upper valve body (6) and the lower valve body (1), two ends of a spring (5) are respectively abutted against the fixed valve core (7) and a supporting part, a fourth through hole coaxial with a third through hole is formed in the upper valve body (6), a fifth through hole coaxial with the fourth through hole is formed in the fixed valve core (7), the upper part of the fixed valve core (7) is arranged at the lower part of the fourth through hole, the flow limiting valve core (8) is positioned in the fourth through hole, the flow limiting valve core (8) is of a barrel-shaped structure with a downward opening and is sleeved at the outer side of the upper part of the fixed valve core (7) in a clearance way, a sealing cover body (9) for sealing the fifth through, a flow limiting channel (10) is formed between the flow limiting valve core (8) and the hole wall of the fourth through hole, a second pressure relief channel (11) is formed in the upper valve body (6), and the second pressure relief channel (11) is communicated with the flow limiting channel (10); the hydraulic driving mechanism comprises a piston (12) and a piston gland (13), the piston gland (13) is fixed at the upper end of the fourth through hole in a sealing mode, the piston (12) is located between the piston gland (13) and the flow limiting valve core (8) and is abutted to the flow limiting valve core (8), and the piston gland (13) is provided with an oil filling hole (14).
2. The ultra-high pressure proportional unloader valve according to claim 1, wherein: the fourth through-hole is the one-level shoulder hole that the path hole is located the below, piston gland (13) threaded connection is on the inner wall on fourth through-hole major diameter hole upper portion, piston (12) are the reducing piston of compriseing major diameter portion and minor diameter portion, the major diameter portion of piston (12) is located the major diameter hole's of fourth through-hole the lower part and can slide between the ladder surface of piston gland (13) and fourth through-hole, the path position of piston (12) is located the top surface of the upper portion and the butt current-limiting valve core (8) of the minor diameter hole of fourth through-hole.
3. The ultra-high pressure proportional unloader valve according to claim 2, wherein: the flow limiting valve core (8) is provided with an external thread, and a flow limiting channel (10) is formed between the external thread of the flow limiting valve core (8) and the inner wall of the fourth through hole.
4. The ultra-high pressure proportional unloader valve according to claim 3, wherein: the fifth through hole is a first-stage stepped hole with a small-diameter hole positioned above, the upper end face of the fixed valve core (7) is a spherical surface matched with the sphere, and the central axis of the spherical surface is coaxial with the fifth through hole.
5. The ultra-high pressure proportional unloader valve according to any one of claims 1 to 4, wherein: the outer diameter of the lower end of the floating valve core (3) is reduced to form a circular truncated cone side surface, and the limiting part is the circular truncated cone side surface matched with the lower end of the floating valve core (3).
6. The ultra-high pressure proportional unloader valve according to claim 5, wherein: the lower part of the fixed valve core (7) is of a structure formed by two circular truncated cones which are coaxial and have opposite large-diameter bottom surfaces, the axis of the circular truncated cone of the fixed valve core (7) is coaxial with the first through hole, the diameters of the upper end of the first through hole and the lower end of the fourth through hole are increased to form a circular truncated cone-shaped flared part, and the lower part of the fixed valve core (7) is clamped and fixed in the two flared parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010431700.1A CN111456978A (en) | 2020-05-20 | 2020-05-20 | Ultrahigh pressure proportional unloading valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010431700.1A CN111456978A (en) | 2020-05-20 | 2020-05-20 | Ultrahigh pressure proportional unloading valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111456978A true CN111456978A (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010431700.1A Pending CN111456978A (en) | 2020-05-20 | 2020-05-20 | Ultrahigh pressure proportional unloading valve |
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| Country | Link |
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| CN (1) | CN111456978A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114550957A (en) * | 2022-01-28 | 2022-05-27 | 清华大学 | Passive flow limiting device for low-temperature reactor coolant pipeline |
| CN114550957B (en) * | 2022-01-28 | 2024-06-21 | 清华大学 | Passive flow-limiting device for low-temperature reactor coolant pipeline |
-
2020
- 2020-05-20 CN CN202010431700.1A patent/CN111456978A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114550957A (en) * | 2022-01-28 | 2022-05-27 | 清华大学 | Passive flow limiting device for low-temperature reactor coolant pipeline |
| CN114550957B (en) * | 2022-01-28 | 2024-06-21 | 清华大学 | Passive flow-limiting device for low-temperature reactor coolant pipeline |
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Address after: 030013 Xiangyang Town Xiangyang Village, Jiancaoping District, Taiyuan City, Shanxi Province Applicant after: Shanxi Hongyi Machinery Equipment Co.,Ltd. Address before: 030013 Xiangyang Town Xiangyang Village, Jiancaoping District, Taiyuan City, Shanxi Province Applicant before: TAIYUAN HONGHUO MACHINERY EQUIPMENT Co.,Ltd. |
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