CN113733008A - 'O' -shaped sealing ring and retaining ring gentle expansion tool - Google Patents
'O' -shaped sealing ring and retaining ring gentle expansion tool Download PDFInfo
- Publication number
- CN113733008A CN113733008A CN202110979912.8A CN202110979912A CN113733008A CN 113733008 A CN113733008 A CN 113733008A CN 202110979912 A CN202110979912 A CN 202110979912A CN 113733008 A CN113733008 A CN 113733008A
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- expansion
- bush
- support
- bushing
- expanding
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- 238000007789 sealing Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 241000446313 Lamella Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/0028—Tools for removing or installing seals
Abstract
The invention discloses an O-shaped sealing ring and check ring gentle expansion tool, which comprises a screw rod, a support bushing, an expansion bushing, a sliding block and a nut, wherein the support, the support bushing, the expansion bushing and the sliding block are sequentially sleeved at one end of the screw rod and then connected with the nut, and the other end of the screw rod is a free end; the expansion bush is a structural member formed by enclosing at least two fan-shaped pieces, the longitudinal section of the expansion bush is circular in a use state, the inner surface of the expansion bush is matched with the outer surface of the sliding block in shape, the O-shaped sealing ring and the retainer ring are flatly expanded, and the O-shaped sealing ring or the retainer ring can be flatly, quickly and undistorted by rotating the handle only by sleeving the O-shaped sealing ring and the retainer ring on the expansion bush.
Description
Technical Field
The invention belongs to the technical field of aerospace manufacturing, and particularly relates to a tool for gently expanding O-shaped sealing rings and check rings.
Background
In the domestic aerospace industry, the problems of 'running, overflowing, dripping and leaking' are always pending and troubles various host factories for a long time. In the pipelines of hydraulic and fuel oil systems of airplanes, O-shaped sealing rings and check rings are mostly arranged in sealing grooves for soft sealing at present; the sealing principle mainly comprises the following steps: the O-shaped sealing ring is compressed through pretightening force to provide sealing force, and the O-shaped check ring is mainly used for preventing the sealing ring from being pressed into a gap between two parts under unilateral pressure to cause damage to the sealing ring and cause sealing failure.
When installing "O" type sealing washer, retaining ring need expand its internal diameter earlier, and traditional inflation mode is with the help of a tapering round pin, expands "O" type sealing washer, retaining ring through gliding mode slowly, and at the slip in-process, "O" type sealing washer, retaining ring can receive the yawing force, produces the distortion easily. 2014 a certain type of machine hydraulic system certain joint oil leak, unpack up the discovery, "O" type sealing washer, retaining ring real object not damaged, only partial distortion, later experimental discovery, "O" type sealing washer, retaining ring directly influence sealed effect in the gesture of seal groove.
Based on the O-shaped sealing ring and the check ring, a tool for gently expanding is researched, developed and designed.
Disclosure of Invention
In order to solve one of the problems, the invention provides an O-shaped sealing ring and retaining ring gentle expansion tool, which comprises a screw rod, a support bush and an expansion bush, wherein the O-shaped sealing ring or the retaining ring is sleeved on the expansion outer sleeve, a handle is screwed to slowly enlarge the outer diameter of the expansion bush, so that the O-shaped sealing ring or the retaining ring is expanded, and the problems are solved: in the prior art, the technical problem that sealing effect is influenced by the fact that an O-shaped sealing ring and a check ring are distorted by external force or damaged by unilateral pressure in the expanding process of a taper pin is adopted.
A tool for gently expanding an O-shaped sealing ring and a check ring comprises a screw rod, a support bushing, an expansion bushing, a sliding block and a nut, wherein the support, the support bushing, the expansion bushing and the sliding block are sequentially sleeved at one end of the screw rod and then connected with the nut, and the other end of the screw rod is a free end;
the expansion bush is a structural part formed by enclosing at least two fan-shaped parts, the longitudinal section of the expansion bush is circular in a use state, and the inner surface of the expansion bush is matched with the outer surface of the sliding block in shape.
The present application primarily considers: in the pipeline of the hydraulic and fuel oil system of the airplane, an o-shaped sealing ring and a check ring are usually installed in a sealing groove for soft sealing. When the O-shaped sealing ring and the check ring are installed, the O-shaped sealing ring and the check ring need to be expanded slowly.
In the existing expansion mode, such as a taper pin, in the sliding process, the O-shaped sealing ring and the check ring are distorted due to lateral force, and the sealing effect is poor. Among this technical scheme, adopt the gentle instrument of expandeing, in this instrument, the science has designed the bush structure of expandeing, specifically is enclosed the structure that closes and form by 2 lamella fan-shaped pieces at least, preferably 3 lamellas, establishes ring spring in the periphery cover of the bush of expandeing simultaneously.
The specific operation process comprises the following steps: the screw rod is rotated by external force to drive the nut connected with the screw rod, the nut continuously moves towards the inner bottom surface close to the expansion bush, after the end surface of the nut is attached to the end surface of the sliding block, the screw rod is continuously screwed, the sliding block continuously applies acting force to the inner surface of the expansion bush on the whole under the acting force of the nut, the acting force direction is the radial direction and the left direction or the direction close to the support bush, but the support bush structure is installed, so that the nut is powerfully limited in the left direction, and can only move in the radial direction, and the inner diameters of the O-shaped sealing ring and the check ring sleeved on the nut are amplified along with the inner diameter.
In the process, the inner side surfaces of the O-shaped sealing ring and the check ring are uniformly subjected to external force transmitted by the expanded bushing, local stress is not uniform, local damage or lateral force is caused, distortion occurs, and the sealing effect of the O-shaped sealing ring and the check ring is influenced.
Further, the inner surface of the expansion bush is a 45-degree conical surface, and the sliding block is of a 45-degree conical structure. In order to enable the inner surface of the expansion bush and the appearance shape of the sliding block to be more adaptive in the operation process, and under the rotation of the screw rod, the acting force transmitted to the sliding block is fully contacted with the inner surface of the expansion bush through the sliding block. Specifically be, the slider transmits the face-to-face mode of radial effort to expand to the bush, and the structure that corresponds preferred slider and expand the bush adaptation is: the inner surface of the expansion bush is designed into a 45-degree conical surface, the sliding block is of a 45-degree conical block structure, the shape of the sliding block is matched, meanwhile, in the contact process of the sliding block to the bottom surface of the inner edge of the expansion bush, the contact surface is gradually increased, the acting force is also gradually increased, and the acting force transmitted to the contact surface of the expansion bush is uniform. So, the corresponding cover is established and is evenly stressed at "O" type sealing washer, the retaining ring of the bloated bush of the cover, and increases gradually, and then gradually bloated, ensures that the leakproofness is good.
Furthermore, in order to ensure that the annular spring sleeved on the expansion bush can slide freely without the action of external force, the outer surface of the expansion bush is provided with an annular spring groove for installing the annular spring (6). Thus, the contact area of the annular spring and the expansion bush is fixed, 1) the annular spring can be prevented from being connected with an O-shaped sealing ring and a check ring; 2) the entire received or transmitted force is uniform whether the ring spring is in an extended or retracted state.
Further, the annular spring groove is located between two adjacent segments. If the expansion bush is composed of two fan-shaped structural members, two annular spring grooves are arranged on the expansion bush, part of the annular spring in contact with the annular spring grooves is inserted into the groove body, and the rest part of the annular spring is in contact with the surface of the expansion spring.
Further, the expansion bush is a structural member formed by enclosing three-segment sector parts.
Further, the screw rod is connected with the handle through a pin. One end of the screw rod connected with the handle is fixed through a pin. The screw rod is inserted into the handle and is in threaded connection with the handle. In order to transmit force to the screw rod when the handle is rotated more smoothly, the connection part between the screw rod and the handle may be fixed by a pin or may be fixed by another method.
Further, the support bushing and the expansion bushing are sequentially connected to form an integral structure, and the screw rod sequentially penetrates through the centers of the support, the support bushing, the expansion bushing and the sliding block.
Furthermore, the support bushing and the expansion bushing are sequentially connected and form an integral structure, and the transverse centers of the support, the support bushing and the expansion bushing are on the same horizontal line.
Further, the periphery of the expansion bush is sleeved with an annular spring. The function of the annular spring is that after the expanding bush loses the 45-degree end face supporting force of the sliding block, the annular spring is restored to the original shape under the action of the restoring force of the annular spring, and the annular spring is convenient to use for the next time.
Further, the annular spring is located in the middle of the outer periphery of the expansion outer sleeve. After the expansion tool is used up, the expansion bush loses 45-degree end face supporting force of the sliding block, and the expansion bush is restored to the original size under the action of the restoring force of the annular spring, so that the O-shaped sealing ring and the check ring can be expanded next time conveniently.
The beneficial effect of this application:
1) the invention relates to a gentle expansion tool for an O-shaped sealing ring and a check ring, which is a simple tool and only needs to arrange the O-shaped sealing ring and the check ring on an expansion bush. The expansion bush is a structural part formed by enclosing at least two fan-shaped pieces, the inner surface of the expansion bush is a 45-degree conical surface, the sliding block is of a 45-degree conical structure, the expansion bush is matched with the sliding block structure, the sliding block is driven by the screw rod, and meanwhile, under the structural limitation of the supporting bush, the expansion bush can only do radial enlarging movement, so that the inner diameters of the O-shaped sealing ring and the check ring are enabled. Can be flatly, quickly and without distortion.
2) The sealing ring and the check ring only have radial load under the action of the expansion bush, and have no load in other directions, so that the distortion phenomenon cannot be generated, and the condition of unilateral stress does not exist, thereby improving the quality and the service cycle of the sealing ring and the check ring.
3) The expansion tool disclosed by the invention has the advantages of simple structure, low manufacturing cost, short specific operation time, convenience in maintenance and the like, and has quite strong application value in the aspects of manufacturing and installation in the aerospace field.
Drawings
FIG. 1 is a front view of a gentle expansion tool for O-ring and retainer rings in accordance with the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural view of the gentle expanding tool for the O-shaped sealing ring and the check ring of the invention;
FIG. 4 is a schematic structural view of example 1 of the present invention;
wherein: 1-handle, 2-pin, 3-screw, 4-support, 5-support bush, 6-ring spring, 7-expansion bush, 8-slide block, 9-nut, 10-ring spring groove.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification 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.
Example 1:
as shown in fig. 1-4, an O-shaped seal ring and retainer ring gentle expansion tool comprises a screw 3, a support 4, a support bushing 5, an expansion bushing 7, a slider 8 and a nut 9, wherein the support 4, the support bushing 5, the expansion bushing 7 and the slider 8 are sequentially sleeved at one end of the screw 3 and then connected with the nut 9, and the other end of the screw 3 is a free end;
the expansion bush 7 is a structural member formed by enclosing at least two fan-shaped pieces, in a use state, the longitudinal section of the expansion bush 7 is circular, the inner surface of the expansion bush 7 is matched with the outer surface of the sliding block 8 in shape, and the periphery of the expansion bush 7 is sleeved with the annular spring 7.
Expand bush 7 and 8 shape adaptations of slider, preferred specific adaptation structure is: the inner surface of the expansion bush 7 is a 45-degree conical surface, and the sliding block 8 is of a 45-degree conical structure.
Besides the screw rod 3 is rotated by external force, the free end of the screw rod 3 can be connected with the handle 1. Preferably, the handle 1 is rotated to drive the screw 3.
Wherein, the screw rod 3 is connected with the handle 1 through the pin 2. The support 4, the support bushing 5 and the expansion bushing 7 are sequentially connected and form an integral structure, and the screw rod 3 sequentially penetrates through the centers of the support 4, the support bushing 5, the expansion bushing 7 and the sliding block 8. Wherein, in the using state, the centers of the support 4, the support bush 5, the expansion bush 7, the slide block 8, the handle 1 and the nut 9 are on the same horizontal line.
In this embodiment, the specific installation process of the expansion tool: the handle 1 is connected with the screw rod 3 through threads, in order to prevent relative movement between the handle 1 and the screw rod 3, when the free end of the screw rod 3 is inserted into a position with internal threads of the handle 1, a phi 3 hole is drilled in the handle 1, then a pin is inserted, two points are punched at two ends of the pin, the connection between the screw rod 3 and the handle 1 is strengthened, and looseness is avoided. And then, the screw 3 sequentially passes through the support 4, the support bush 5, the expansion bush 6 and the slide block 8, finally, the nut 9 is screwed, when the distance between the end surface of the nut 9 and the end surface of the screw 3 is 1-1.5 screw pitches, 3 points are punched at the threaded connection part along the circumferential direction to be loosened, and finally, the annular spring 6 is arranged on the expansion bush 7 to form an O-shaped sealing ring and a retaining ring gentle expansion tool.
The specific working process is as follows: when the expansion bush is used, in a free state, namely the position shown in figure 1, an O-shaped sealing ring or a check ring is sleeved on the expansion bush 7, the handle 1 is screwed anticlockwise, the nut 9 is driven to move leftwards through thread transmission, after one end face of the nut 9 is attached to the end face of the sliding block 8, the handle 1 is continuously screwed anticlockwise, the sliding block 8 slides the whole leftwards under the action force of the nut 9 leftwards, the force transmitted by the 45-degree conical surface is transmitted to the expansion bush 7, the expansion bush 7 has the movement trend of increasing leftwards and radially, the leftward movement is limited by the support bush 5 and can only move in the direction of increasing radially, and the inner diameter of the O-shaped sealing ring or the check ring sleeved on the expansion bush is increased along with the inner diameter of the O-shaped sealing ring or the check ring.
The nut in the above description may be specifically an M6 nut, and the pin may be a D3 pin.
The specific structure of the support bushing 5, the seat 4, the pin 2, the handle 1, etc., and the operation principle thereof, which are referred to in this embodiment, are well known to those skilled in the art and will not be described in detail herein.
Example 2:
in this embodiment, on the basis of embodiment 1, in order to ensure that the annular spring 6 sleeved on the outer surface of the expansion bush 7 does not slide on the surface of the expansion bush 7 during the process of expanding the "O" ring or the retainer ring, the normal operation is not affected. Thus, the outer surface of the expansion bush 7 is provided with an annular spring groove 10, and the annular spring groove 10 is used for mounting the annular spring 6. Wherein the annular spring groove 10 is located between two adjacent segments.
In the embodiment, the arrangement of the annular spring groove 10 is beneficial to slowly and gradually expanding the expansion bush 7 to open the O-shaped sealing ring or the retainer ring under the radial acting force of the sliding block 8; meanwhile, the force transmitted to the inner side surface of the O-shaped sealing ring or the check ring by the expansion bush 7 is the same and uniform, so that local stress is avoided to the maximum extent, or the O-shaped sealing ring or the check ring is distorted in the stress process to influence the sealing effect.
After the use, the handle 1 is rotated clockwise until the supporting force of the sliding block 8 on the end face of 45 degrees is lost, and the expansion bush 7 restores the original size under the action of the restoring force of the annular spring 6, so that the expansion of the next time is facilitated.
Example 3:
in this embodiment, in addition to the above-described embodiments, it is preferable that the expansion bush 7 is a structural member formed by surrounding three segments. The three-segment fan-shaped part is formed, so that the expansion bush 7 is more favorably stressed uniformly, and the structure is stable in the radial stress process.
In this embodiment, on the basis of embodiment 1, in order to further enhance the force uniformity of the expanding outer sleeve, the ring spring 6 is located in the middle of the outer periphery of the expanding outer sleeve 7, and the ring spring may also be mounted on other parts of the expanding outer sleeve 7 with equivalent technical effects, which are within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Finally, it should be noted that: the embodiment of the present invention is disclosed only as a preferred embodiment of the present invention, which is only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a "O" type sealing washer, retaining ring gently expand instrument, its characterized in that: the nut expanding device comprises a screw rod (3), a support (4), a support bushing (5), an expanding bushing (7), a sliding block (8) and a nut (9), wherein the support (4), the support bushing (5), the expanding bushing (7) and the sliding block (8) are sequentially sleeved at one end of the screw rod (3) and then connected with the nut (9), and the other end of the screw rod (3) is a free end;
the expansion bush (7) is a structural member formed by enclosing at least two fan-shaped pieces, the longitudinal section of the expansion bush (7) is circular in a use state, the inner surface of the expansion bush (7) is matched with the outer surface of the sliding block (8) in shape, and the periphery of the expansion bush (7) is sleeved with the annular spring (7).
2. The gentle expanding instrument of "O" type sealing washer, retaining ring according to claim 1 characterized in that: the inner surface of the expansion bush (7) is a 45-degree conical surface, and the sliding block (8) is of a 45-degree conical structure.
3. The O-ring and retainer ring gentle expansion tool of claim 1 or 2, wherein: and the outer surface of the expansion bush (7) is provided with an annular spring groove (10) for mounting an annular spring (6).
4. The gentle expanding instrument of "O" type sealing washer, retaining ring according to claim 3 characterized in that: the annular spring groove (10) is positioned between two adjacent sectors.
5. The gentle expanding instrument of "O" type sealing washer, retaining ring according to claim 4 characterized in that: the expansion bush (7) is a structural part formed by enclosing three-segment fan-shaped parts.
6. The gentle expanding instrument of "O" type sealing washer, retaining ring according to claim 4 characterized in that: the free end of the screw rod (3) is connected with the handle (1).
7. The gentle instrument of expanding of "O" type sealing washer, retaining ring according to claim 6 characterized in that: the screw rod (3) is connected with the handle (1) through a pin (2).
8. The gentle expanding instrument of "O" type sealing washer, retaining ring according to claim 7 characterized in that: the support (4), the support bushing (5) and the expansion bushing (7) are sequentially connected to form an integral structure, and the screw rod (3) sequentially penetrates through the centers of the support (4), the support bushing (5), the expansion bushing (7) and the sliding block (8).
9. The gentle instrument of expanding of "O" type sealing washer, retaining ring of claim 8 characterized in that: in a use state, the centers of the support (4), the support bush (5), the expansion bush (7), the sliding block (8), the handle (1) and the nut (9) are on the same horizontal line.
10. The gentle instrument of expanding of "O" type sealing washer, retaining ring of claim 8 characterized in that: the annular spring (6) is positioned in the middle of the periphery of the expansion outer sleeve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110979912.8A CN113733008A (en) | 2021-08-25 | 2021-08-25 | 'O' -shaped sealing ring and retaining ring gentle expansion tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110979912.8A CN113733008A (en) | 2021-08-25 | 2021-08-25 | 'O' -shaped sealing ring and retaining ring gentle expansion tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113733008A true CN113733008A (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110979912.8A Pending CN113733008A (en) | 2021-08-25 | 2021-08-25 | 'O' -shaped sealing ring and retaining ring gentle expansion tool |
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| CN (1) | CN113733008A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201816024U (en) * | 2010-09-30 | 2011-05-04 | 中国石油化工股份有限公司 | Slip embedded tensioner |
| CN202316817U (en) * | 2011-09-14 | 2012-07-11 | 刘工勤 | Pipeline orifice expander |
| CN203566622U (en) * | 2013-11-14 | 2014-04-30 | 内蒙古第一机械集团有限公司 | Elastic press-fitting device of seal ring of piston |
| CN204036370U (en) * | 2014-07-30 | 2014-12-24 | 中国石油天然气股份有限公司 | Check valve spool extractor |
| CN204396948U (en) * | 2014-12-08 | 2015-06-17 | 朱裕生 | A kind of excircle of barrel-shaped parts Special Fixture for Machining |
| CN109732301A (en) * | 2019-01-30 | 2019-05-10 | 苏州纽威阀门股份有限公司 | A kind of ball valve assembly tooling and assembly technology |
| US20200072021A1 (en) * | 2018-08-31 | 2020-03-05 | Xi'an Well-Good Energy Technology Co.,Ltd. | Dissolvable, variable-diameter metal sealing and fracturing bridge plug |
| CN210414376U (en) * | 2019-08-17 | 2020-04-28 | 石家庄科源机械设备有限公司 | Sealing ring installation tool for horizontal feeding body of dry-process granulator |
-
2021
- 2021-08-25 CN CN202110979912.8A patent/CN113733008A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201816024U (en) * | 2010-09-30 | 2011-05-04 | 中国石油化工股份有限公司 | Slip embedded tensioner |
| CN202316817U (en) * | 2011-09-14 | 2012-07-11 | 刘工勤 | Pipeline orifice expander |
| CN203566622U (en) * | 2013-11-14 | 2014-04-30 | 内蒙古第一机械集团有限公司 | Elastic press-fitting device of seal ring of piston |
| CN204036370U (en) * | 2014-07-30 | 2014-12-24 | 中国石油天然气股份有限公司 | Check valve spool extractor |
| CN204396948U (en) * | 2014-12-08 | 2015-06-17 | 朱裕生 | A kind of excircle of barrel-shaped parts Special Fixture for Machining |
| US20200072021A1 (en) * | 2018-08-31 | 2020-03-05 | Xi'an Well-Good Energy Technology Co.,Ltd. | Dissolvable, variable-diameter metal sealing and fracturing bridge plug |
| CN109732301A (en) * | 2019-01-30 | 2019-05-10 | 苏州纽威阀门股份有限公司 | A kind of ball valve assembly tooling and assembly technology |
| CN210414376U (en) * | 2019-08-17 | 2020-04-28 | 石家庄科源机械设备有限公司 | Sealing ring installation tool for horizontal feeding body of dry-process granulator |
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Application publication date: 20211203 |