A plugging and separating device for the oil passage hole inside a speed regulator

Abstract

The application discloses a plugging and separating device for an oil passage hole in a speed regulator, relates to the technical field of speed regulator pressure maintaining test, and discloses that a strip-shaped hole is formed in an outer wall surface of a speed regulator body, a plurality of oil passing channels in the speed regulator body all penetrate and communicate with the strip-shaped hole, the communication positions of the plurality of oil passing channels and the strip-shaped hole are arranged at intervals along the length direction of the strip-shaped hole, and the device comprises an expansion cylinder, a plurality of radially expandable sealing convex rings are coaxially arranged on the outer peripheral wall of the expansion cylinder, the plurality of sealing convex rings are arranged at intervals along the axial direction of the expansion cylinder, and an expansion plug rod is inserted into the top end cylinder opening of the expansion cylinder at one end, so that the cylinder wall of the expansion cylinder inserted into the strip-shaped hole is expanded, and then the plurality of sealing convex rings are all plugged in the strip-shaped hole, and a plurality of communication channels corresponding to the plurality of oil passing channels are formed between the outer wall of the expansion cylinder and the inner wall of the strip-shaped hole and between any two adjacent sealing convex rings. The device has the advantages of simple structure, convenient installation and removal, high pressure resistance, and reliability and stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of governor pressure test, in particular to a plugging and separating device for oil passage holes in a governor. BACKGROUND

[0002] In order to verify whether the oil passage in the governor body has casting defects, a manual hydraulic pump is used to sequentially press and test the oil passage in the governor, and a certain oil pressure needs to be maintained for a short time. The strip-shaped holes formed by machining are connected to the oil passages in the governor body. When the oil passages are tested independently, the oil passages need to be separated to maintain the independence of each oil passage. In order to achieve the independence of the oil passages in the governor body, a plugging and separating device for the oil passage holes in the governor is designed. The commonly used method is to use multiple O-rings inserted into the strip-shaped holes to sequentially plug the strip-shaped holes and separate each oil passage to prevent the adjacent oil passages from being connected through the strip-shaped holes. Referring to Figure 1 , an iron ring 34 is placed between the adjacent O-rings 33 (the outer wall of the iron ring 34 has an annular groove 341 in the middle to maintain the connection of the same oil passage corresponding to the strip-shaped hole 32), and then the O-rings 33 are compressed to be flattened and expanded to seal the strip-shaped hole 32, thereby forming multiple separation sections in the axial direction of the strip-shaped hole 32 to separate the oil passages 31. However, due to the existence of metal sharp edges in the strip-shaped holes drilled, the O-rings may be cut and damaged when they are inserted, which reduces the sealing performance. In addition, during the test process, the oil pressure is greater than or equal to 12 MPa, and external pressure needs to be applied to compress and expand the O-rings so that they can block the oil pressure during the test process. The O-rings may be crushed during the expansion process, which may cause the adjacent oil passages to be connected and affect the test results, making the pressure test process difficult.

[0003] Therefore, according to the structural characteristics of the oil passages and the strip-shaped holes in the governor body, it is necessary to design a plugging and separating device for the oil passages, which is suitable for entering the strip-shaped holes, easy to disassemble and assemble, and resistant to high pressure. SUMMARY

[0004] Therefore, the present application provides a plugging and separating device for oil passage holes in a governor, which solves the technical problems of poor sealing effect, inconvenient disassembly and assembly, and poor high-pressure resistance of the O-rings used to plug and separate the oil passages in the conventional pressure test of the oil passages in the governor.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The application provides a plugging and separating device for an oil passage hole in a speed regulator.

[0007] An expansion cylinder is inserted into the strip-shaped hole from the bottom end of the strip-shaped hole; a plurality of radially expandable sealing convex rings are coaxially arranged on the outer circumferential wall of the expansion cylinder; and the plurality of sealing convex rings are axially spaced apart along the expansion cylinder.

[0008] An expansion plug rod is inserted into the expansion cylinder from the top end of the expansion cylinder, so that the cylinder wall of the expansion cylinder inserted into the strip-shaped hole expands, thereby causing the plurality of sealing convex rings to be plugged in the strip-shaped hole and forming a plurality of communication channels corresponding to the plurality of oil passage channels between the outer wall of the expansion cylinder and the inner wall of the strip-shaped hole and between any two adjacent sealing convex rings.

[0009] The device for plugging and separating the oil passage hole in the speed regulator is used by first inserting the bottom end of the expansion cylinder into the bottom of the strip-shaped hole, then gradually inserting one end of the expansion plug rod into the cylinder cavity of the expansion cylinder from the top end of the expansion cylinder, and expanding the expansion cylinder radially under the extrusion of the expansion plug rod, thereby expanding each sealing convex ring, and the outer circumferential wall of each sealing convex ring is tightly fitted against the inner wall of the strip-shaped hole to achieve sealing and plugging. At this time, a communication channel is formed between the outer wall of the expansion cylinder and the inner wall of the strip-shaped hole and between any two adjacent sealing convex rings, and each communication channel is used to communicate a corresponding oil passage channel to ensure the smoothness of the oil passage channel during pressure testing, but any two adjacent oil passage channels in the strip-shaped hole are blocked by the corresponding sealing convex ring to avoid oil leakage between the adjacent oil passage channels under high pressure testing. After testing, the expansion plug rod is pulled out, and then the expansion cylinder is removed. The device is easy to install and disassemble and resistant to high pressure, and can effectively plug and isolate the oil passage channels corresponding to the strip-shaped hole on the speed regulator body. The ring hole of the sealing convex ring has stronger pressure resistance under the support of the expansion plug rod, so that the plugging and isolation have better reliability.

[0010] As a further improvement of the above technical solution, the expansion cylinder comprises an elastic expansion cylinder body and a flexible sealing sleeve.

[0011] The cylinder cavity of the elastic expansion cylinder body is a tapered cylinder cavity that gradually narrows from the top end to the bottom end; a plurality of annular protrusions are coaxially and integrally connected to the outer circumferential wall of the elastic expansion cylinder body; and the plurality of annular protrusions are axially spaced apart along the elastic expansion cylinder body.

[0012] The flexible sealing sleeve is arranged and attached to the outer peripheral wall of the elastic expansion cylinder and forms a radially expandable sealing convex ring at the position corresponding to the annular protrusion; one end of the expansion plug rod is inserted into the top end of the elastic expansion cylinder to make it expand.

[0013] The beneficial effects of the above technical solution are: the elastic expansion cylinder serves as the support framework of the flexible sealing sleeve, supports and shapes the flexible sealing sleeve, the part of the flexible sealing sleeve corresponding to the annular protrusion forms a sealing convex ring, the sealing convex ring is more stable in structure and can withstand high pressure under the support of the annular protrusion, and the flexible sealing sleeve is directly pressed and attached to the inner wall of the strip-shaped hole to play a sealing role. The expansion cylinder structure is simple, easy to manufacture and low in cost.

[0014] As a further improvement of the above technical solution, the expansion cylinder further comprises a guide cylinder; the guide cylinder is a trumpet-shaped opening gradually expanding from the bottom end to the top end; the bottom end of the guide cylinder is coaxially and fixedly arranged at the top end of the elastic expansion cylinder.

[0015] The beneficial effects of the above technical solution are: the trumpet-shaped guide cylinder plays a guiding role in the insertion of the expansion plug rod.

[0016] As a further improvement of the above technical solution, the flexible sealing sleeve is a silica gel or rubber sealing sleeve.

[0017] As a further improvement of the above technical solution, a plurality of strip-shaped division seams are arranged along the length direction of the outer peripheral wall of the elastic expansion cylinder, the strip-shaped division seams are uniformly distributed along the circumference of the elastic expansion cylinder, the cylinder wall of the elastic expansion cylinder is divided into a plurality of elastic strips by the strip-shaped division seams, and the annular protrusions are divided into expansion plug protrusions distributed on the corresponding elastic strips.

[0018] The beneficial effects of the above technical solution are: the elastic expansion cylinder is divided into a plurality of elastic strips by the strip-shaped division seams, the expansion plug protrusions on the elastic strips jointly form an annular protrusion, in use, the elastic strips are radially expanded under the extrusion and pushing of the expansion plug rod, thereby driving each expansion plug protrusion to move radially to provide radial support force for the flexible sealing sleeve; each expansion plug protrusion only moves radially and the structure shape remains stable, which can make the support structure of the annular protrusion more stable and improve the pressure resistance of the device.

[0019] As a further improvement of the above technical solution, the elastic expansion cylinder is a conical frustum-shaped cylinder, the material thereof is spring steel, and the taper thereof is 1°.

[0020] The beneficial effects of the above technical solution are: the conical frustum-shaped elastic expansion cylinder is more convenient to insert into the strip-shaped hole, and can be closely attached to the strip-shaped hole after expansion.

[0021] As a further improvement of the above technical solution, a through hole is formed in the outer peripheral wall of the elastic expansion cylinder corresponding to the top end of each strip-shaped partition slot.

[0022] The beneficial effects of the above technical solution are that the through hole formed in the top end of the strip-shaped partition slot facilitates the expansion and contraction of the elastic strip and the opening and closing.

[0023] As a further improvement of the above technical solution, the bottom end of the strip-shaped partition slot extends to the bottom end of the elastic expansion cylinder to form an opening.

[0024] The beneficial effects of the above technical solution are that the opening at the bottom end of the strip-shaped partition slot facilitates the smooth insertion and extraction of the expansion plug rod.

[0025] As a further improvement of the above technical solution, a ring groove is formed in the outer peripheral wall of the top of the expansion plug rod, and the bottom end has a circular arc chamfer.

[0026] The beneficial effects of the above technical solution are that the circular arc chamfer structure at the bottom end of the expansion plug rod facilitates its smooth insertion into the cylinder cavity of the expansion cylinder, and the ring groove at the top of the expansion plug rod facilitates the extraction of the expansion plug rod.

[0027] As a further improvement of the above technical solution, the expansion plug rod is a metal rod.

[0028] Through the above technical solution, compared with the prior art, the present application provides a plugging and separating device for the oil passage hole in the governor, which has the following advantages and beneficial effects:

[0029] 1. The plugging and separating device for the oil passage in the governor has a simple structure and is easy to disassemble and assemble. The sealing protruding ring has stronger pressure resistance and is more resistant to high pressure under the support of the expansion plug rod, making the plugging and separating performance more reliable and stable.

[0030] 2. After the expansion plug rod is extracted after use, the elastic strip can be automatically and reliably reset under the elastic force of the elastic strip and the contraction elastic force of the flexible sealing sleeve, and can be repeatedly used multiple times. The elastic expansion cylinder with a conical cylindrical cavity can be more smoothly inserted into the strip-shaped hole, and can avoid being damaged by the metal sharp edges at the hole opening and the oil passage hole opening in the strip-shaped hole during insertion.

[0031] 3. Each expansion plug block on the elastic expansion cylinder is radially expanded under the push of the expansion plug rod to drive the flexible sealing sleeve to radially press against the sealing strip-shaped hole, and the radial pressing force is stronger, and the sealing effect is better. Thus, the technical defects of poor sealing effect and poor pressure resistance caused by insufficient radial support force in the traditional O-shaped sealing ring by axial flattening to achieve radial expansion and pressing are effectively overcome. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only aim at the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on the provided drawings.

[0033] Figure 1 Structure schematic diagram of the prior art plugging and separating device for the oil passage hole in the governor;

[0034] Figure 2 Structure schematic diagram of the expansion cylinder of the plugging and separating device for the oil passage hole in the governor in the installed state in the strip-shaped hole;

[0035] Figure 3 The present application Figure 2 Structure enlarged schematic diagram of the A;

[0036] Figure 4 Structure schematic diagram of the elastic expansion cylinder body and the guide cylinder body of the plugging and separating device for the oil passage hole in the governor;

[0037] Figure 5 Structure schematic diagram of the flexible sealing sleeve of the plugging and separating device for the oil passage hole in the governor in the sleeved state on the elastic expansion cylinder body;

[0038] Figure 6 Top view schematic diagram of the expansion cylinder of the plugging and separating device for the oil passage hole in the governor;

[0039] Figure 7 Structure schematic diagram of the expansion plug rod of the plugging and separating device for the oil passage hole in the governor in the inserted state in the expansion cylinder;

[0040] In the drawings: 1, expansion cylinder; 11, elastic expansion cylinder body; 111, strip-shaped partitioning seam; 112, elastic strip plate; 1121, expansion plug protrusion; 1122, annular protrusion; 113, through hole; 12, flexible sealing sleeve; 121, sealing protruding ring; 1211, communication channel; 13, guide cylinder body; 2, expansion plug rod; 21, annular groove; 3, governor body; 31, oil passage; 32, strip-shaped hole; 33, O-shaped sealing ring; 34, iron ring; 341, annular groove; 35, T-shaped rod; 36, annular pressing block. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0044] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] As shown in Figure 1 The speed regulator body 3 has a strip-shaped hole 32 formed on one wall surface, and the middle part of the plurality of oil passing channels 31 inside the speed regulator body 3 penetrates the hole peripheral wall of the strip-shaped hole 32 and communicates with the strip-shaped hole 32, and the communication positions of the plurality of oil passing channels 31 and the strip-shaped hole 32 are arranged along the length direction of the strip-shaped hole 32.

[0046] The existing speed regulator body inside the oil passage plugging and separation device generally uses a plurality of O-shaped sealing rings 33 inserted into the strip-shaped hole 32 to sequentially block the strip-shaped hole 32 and separate each oil passage 31 to prevent adjacent oil passages 31 from being connected through the strip-shaped hole 32; an iron ring 34 is arranged between adjacent O-shaped sealing rings 33, and a ring-shaped groove 341 is formed in the middle of the outer wall of the iron ring 34 to keep the same oil passage 31 on both sides of the corresponding strip-shaped hole 32 connected, and then the ring-shaped pressing block 36 is pressed to make the O-shaped sealing ring 33 flatten and expand to realize the axial sealing of the strip-shaped hole 32, thereby forming a plurality of separation sections in the axial direction of the strip-shaped hole 32 to separate the adjacent oil passages 31, so as to avoid the connection of the adjacent oil passages 31 at the strip-shaped hole 32 during the pressure test, thereby affecting the reliability of the test results. As shown in Figure 1 , the ring-shaped pressing block 36, the O-shaped sealing ring 33 and the iron ring 34 are sleeved on the T-shaped rod 35 and are inserted into the strip-shaped hole 32 together, so that the ring-shaped groove 341 of the iron ring 34 corresponds to the oil passage of the corresponding oil passage 31; one of the oil passages 31 is taken as a test oil passage, one end of the test oil passage is closed, and test oil is input from the other end and is pressurized, while the other oil passages 31 are kept open; if the input test oil leaks from the other oil passages 31, it indicates that there is a crack or sand hole between the test oil passage and the oil leakage oil passage 31 in the speed regulator body 3; if the pressure fluctuation of the test oil passage meets the requirements after the pressure test, it indicates that the test oil passage is normal, and the pressure test is carried out one by one to judge the quality of the speed regulator body.

[0047] According to the embodiment of the present application, as shown in Figures 2 to 7 , a plugging and separation device for the oil passage hole in the speed regulator includes an expansion cylinder 1 and an expansion plug rod 2.

[0048] The bottom end of the expansion cylinder 1 can be inserted into the strip-shaped hole 32 from the hole of the strip-shaped hole 32; a plurality of sealing convex rings 121 coaxially arranged on the outer wall of the expansion cylinder 1 can be radially expanded and contracted; and the plurality of sealing convex rings 121 are arranged at intervals in the axial direction of the expansion cylinder 1. One end of the expansion plug rod 2 can be inserted into the top cylinder of the expansion cylinder 1, so that the cylinder wall of the expansion cylinder 1 inserted into the strip-shaped hole 32 expands, thereby making the plurality of sealing convex rings 121 block the strip-shaped hole 32, and forming a plurality of communication channels 1211 corresponding to the plurality of oil passages 31 in communication between the outer wall of the expansion cylinder 1 and the inner wall of the strip-shaped hole 32 and corresponding to any two adjacent sealing convex rings 121.

[0049] The plugging and separating device for the oil passage hole in the speed regulator provided by the embodiment is used in the following way: first, the bottom end of the expansion cylinder 1 is inserted into the bottom of the strip-shaped hole 32, and then one end of the expansion plug rod 2 is gradually inserted into the cylinder cavity from the top end of the expansion cylinder 1, so that the expansion cylinder 1 is radially expanded under the extrusion of the expansion plug rod 2, and each sealing convex ring 121 is expanded, and the outer peripheral wall surface of each sealing convex ring 121 is tightly fitted against the inner wall surface of the strip-shaped hole 32 to achieve sealing and plugging. At this time, a communication passage 1211 is formed between the outer wall surface of the expansion cylinder 1 and the inner wall surface of the strip-shaped hole 32 and between any two adjacent sealing convex rings 121, and the function of each communication passage 1211 is to communicate with a corresponding oil passage 31 to ensure the smoothness of the oil passage 31 during pressure testing, but any two adjacent oil passages 31 in the strip-shaped hole 32 are blocked by the corresponding sealing convex ring 121 to avoid oil leakage between adjacent oil passages under high pressure testing. After the test is completed, the expansion plug rod 2 is pulled out, and then the expansion cylinder 1 is removed. The device is simple to install and remove and can withstand high pressure, and can effectively plug and isolate the oil passage 31 at the corresponding strip-shaped hole 32 of the speed regulator body 3. The ring hole of the sealing convex ring 121 has stronger pressure resistance under the support of the expansion plug rod 2, so that the reliability of plugging and isolation is better.

[0050] In some embodiments, the expansion cylinder 1 includes an elastic expansion cylinder body 11 and a flexible sealing sleeve 12.

[0051] The cylinder cavity of the elastic expansion cylinder body 11 is a tapered cylinder cavity that gradually narrows from the top end to the bottom end. The outer peripheral wall of the elastic expansion cylinder body 11 is coaxially and integrally connected with a plurality of annular protrusions 1122. The plurality of annular protrusions 1122 are arranged axially and spaced apart along the elastic expansion cylinder body 11.

[0052] The flexible sealing sleeve 12 is fitted and attached to the outer peripheral wall of the elastic expansion cylinder body 11 and forms a sealing convex ring 121 that can be radially expanded and contracted at the corresponding annular protrusion 1122. One end of the expansion plug rod 2 can be inserted into the elastic expansion cylinder body 11 from the top end of the cylinder to expand it.

[0053] The elastic expansion cylinder body 11 serves as a support framework for the flexible sealing sleeve 12 and supports and shapes the flexible sealing sleeve 12. The part of the flexible sealing sleeve 12 corresponding to the annular protrusion 1122 forms a sealing convex ring 121, which is more stable in structure and can withstand high pressure under the support of the annular protrusion 1122. The flexible sealing sleeve 12 is directly pressed against and tightly fitted to the inner wall surface of the strip-shaped hole 32, thereby achieving the sealing effect. The expansion cylinder 1 is simple in structure, easy to manufacture and low in cost.

[0054] In some embodiments, the elastic expansion cylinder body 11 can be designed as an elastic rubber sleeve or a plastic sleeve that can be radially expanded and contracted.

[0055] In some embodiments, the inflation cylinder 1 further comprises a guide cylinder body 13; the guide cylinder body 13 is a horn-shaped body gradually expanding from the bottom end to the top end; the bottom end of the guide cylinder body 13 is coaxially and fixedly fitted at the top end of the elastic inflation cylinder body 11. The horn-shaped guide cylinder body 13 plays a role of guiding the insertion of the plug rod 2.

[0056] In some embodiments, the flexible sealing sleeve 12 is a silica gel or rubber sealing sleeve.

[0057] In some embodiments, the outer peripheral wall of the elastic inflation cylinder body 11 is provided with a plurality of strip-shaped segmentation slits 111 along the length direction; the plurality of strip-shaped segmentation slits 111 are uniformly distributed along the circumferential direction of the elastic inflation cylinder body 11, so as to divide the cylinder wall of the elastic inflation cylinder body 11 into a plurality of elastic strip plates 112, and divide the plurality of annular protrusions 1122 into plug protrusions 1121 distributed on the corresponding elastic strip plates 112.

[0058] The plurality of elastic strip plates 112 are formed by dividing the elastic inflation cylinder body 11 through the plurality of strip-shaped segmentation slits 111, and the plug protrusions 1121 on the plurality of elastic strip plates 112 jointly enclose to form the annular protrusion 1122; in the use process, the elastic strip plates 112 are radially expanded under the extrusion and pushing of the plug rod 2, thereby driving each plug protrusion 1121 to move radially to provide radial support force for the flexible sealing sleeve 12; each plug protrusion 1121 only moves radially while the structure shape thereof remains stable, so as to make the support structure of the annular protrusion 1122 more stable and improve the pressure resistance of the device.

[0059] In some embodiments, the elastic inflation cylinder body 11 can be designed as a plastic sleeve or a metal sleeve.

[0060] In some embodiments, the elastic inflation cylinder body 11 is a circular conical frustum-shaped cylinder body, the material thereof is spring steel, and the taper thereof is 1°; the outer diameter of the top end of the elastic inflation cylinder body 11 is less than or equal to the hole diameter of the strip-shaped hole 32.

[0061] The circular conical frustum-shaped elastic inflation cylinder body 11 is more convenient to insert into the strip-shaped hole 32, and can be tightly fitted to the strip-shaped hole 32 after the inflation of the elastic inflation cylinder body 11.

[0062] In some embodiments, the outer peripheral wall of the elastic inflation cylinder body 11 is provided with a through hole 113 at the top end corresponding to each strip-shaped segmentation slit 111.

[0063] The through hole 113 at the top end of the strip-shaped segmentation slit 111 can facilitate the expansion and contraction and opening and closing of the elastic strip plate 112.

[0064] In some embodiments, the bottom end of the strip-shaped segmentation slit 111 extends to the bottom end of the elastic inflation cylinder body 11 to form an opening.

[0065] The bottom end opening of the strip-shaped dividing slit 111 can facilitate smooth insertion and removal of the expansion plug 2.

[0066] In some embodiments, an annular groove 21 is formed on the outer peripheral wall of the top of the expansion plug 2, and the bottom end thereof has an arc chamfer.

[0067] The arc chamfered structure at the bottom end of the expansion plug rod 2 facilitates its smooth insertion into the barrel cavity of the expansion cylinder 1; the annular groove 21 at the top of the expansion plug rod 2 serves to facilitate the removal of the expansion plug rod 2.

[0068] In some embodiments, the expansion rod 2 is a metal rod.

[0069] Specifically, the expansion plug 2 is a round rod made of 45-gauge steel. Before sealing the oil passage, to ensure smooth insertion of the metal rod into the expansion cylinder, the outer surface of the insertion portion is maintained to a certain roughness requirement, i.e., a certain degree of smoothness. Lubricating oil may also be applied before insertion to facilitate insertion and removal of the metal rod. The outer diameter of the expansion plug 2 can be the same as the inner diameter of the top opening of the elastic expansion cylinder 11.

[0070] It should be noted that the elastic expansion cylinder 11 is made of 60Si2Mn spring steel, and after heat treatment, its hardness is 55 to 60HRC, with good wear resistance and toughness. In order to ensure that the expansion plug rod 2 can smoothly enter the interior of the elastic expansion cylinder 11 and be taken out, and that the flexible sealing sleeve 12 can be smoothly put on the elastic expansion cylinder 11, the inner hole and outer circle of the elastic expansion cylinder 11 are smoothed to meet certain roughness requirements. In order to ensure that the elastic expansion cylinder 11 with the flexible sealing sleeve 12 can smoothly enter the strip hole 32 of the speed regulator body, the elastic expansion cylinder 11 is designed as a conical cylinder. A trumpet-shaped guide cylinder 13 is provided at the top of the elastic expansion cylinder 11. The trumpet-shaped guide cylinder 13 and the elastic expansion cylinder 11 can be integrally formed to ensure a smooth transition between the inner cavity surfaces of the two. The expansion plug rod 2 can be smoothly inserted into the elastic expansion cylinder 11 along the arc-shaped inner cavity surface of the guide cylinder 13. The flexible sealing sleeve 12 is made of nitrile rubber, which has good elasticity, oil resistance, wear resistance and aging resistance. The flexible sealing sleeve 12 is put on the elastic expansion cylinder 11 to ensure that it can tightly adhere to the outer wall surface of the elastic expansion cylinder 11; the flexible sealing sleeve 12 can be replaced when the quality deteriorates and the sealing effect is reduced.

[0071] It should be further explained that the number and position of the annular protrusions 1122 of the elastic expansion cylinder 11 are determined according to the number of oil passages 31 passing through the strip hole 32 and the intervals between adjacent oil passages 31 .

[0072] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearance of the above-mentioned terms in various places in the specification does not necessarily refer to the same embodiment or example. Moreover, the particular features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the specification.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A device for sealing and separating an oil passage hole inside a speed regulator, wherein a strip hole (32) is provided on an outer wall of a speed regulator body (3), and a plurality of oil passages (31) inside the speed regulator body (3) all pass through the hole wall of the strip hole (32) and communicate with the strip hole (32), and the communication positions of the plurality of oil passages (31) and the strip hole (32) are arranged at intervals along the length direction of the strip hole (32), characterized in that: include: An expansion cylinder (1), wherein the bottom end of the expansion cylinder (1) can be inserted into the strip hole (32) from the opening of the strip hole (32); a plurality of radially expandable and contractible sealing convex rings (121) are coaxially provided on the outer peripheral wall of the expansion cylinder (1); the plurality of sealing convex rings (121) are spaced apart along the axial direction of the expansion cylinder (1); An expansion plug rod (2), one end of which can be inserted from the top end of the expansion cylinder (1) to expand the cylinder wall of the expansion cylinder (1) inserted into the strip hole (32), thereby causing the multiple sealing convex rings (121) to be sealed in the strip hole (32), and forming multiple communication channels (1211) that are connected to the multiple oil passages (31) between the outer wall of the expansion cylinder (1) and the inner wall of the strip hole (32) and between any two adjacent sealing convex rings (121).

2. A device for sealing and separating the oil passage hole inside a speed regulator according to claim 1, characterized in that: The expansion cylinder (1) comprises an elastic expansion cylinder body (11) and a flexible sealing sleeve (12); The cylinder cavity of the elastic expansion cylinder (11) is a tapered cylinder cavity that gradually narrows from the top end to the bottom end; a plurality of annular protrusions (1122) are coaxially and integrally connected to the outer peripheral wall of the elastic expansion cylinder (11); the plurality of annular protrusions (1122) are arranged at intervals along the axial direction of the elastic expansion cylinder (11); The flexible sealing sleeve (12) is adapted to fit the outer peripheral wall of the elastic expansion cylinder (11) and forms a radially expandable and contractible sealing convex ring (121) corresponding to the annular convex block (1122); one end of the expansion plug rod (2) can be inserted from the top end of the elastic expansion cylinder (11) to expand it.

3. A device for sealing and separating the oil passage hole inside a speed regulator according to claim 2, characterized in that: The expansion cylinder (1) further comprises a guide cylinder (13); the guide cylinder (13) is in a trumpet shape that gradually expands from the bottom end to the top end; the bottom end of the guide cylinder (13) is coaxially adapted and fixed to the top end of the elastic expansion cylinder (11).

4. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 2, characterized in that: The flexible sealing sleeve (12) is a silicone or rubber sealing sleeve.

5. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 2, characterized in that: The outer peripheral wall of the elastic expansion cylinder (11) is provided with a plurality of strip-shaped dividing slits (111) along the longitudinal direction. The plurality of strip-shaped dividing slits (111) are evenly distributed along the circumference of the elastic expansion cylinder (11) so as to divide the cylinder wall of the elastic expansion cylinder (11) into a plurality of elastic strip plates (112), and divide the plurality of annular protrusions (1122) into expansion plug protrusions (1121) distributed on the corresponding elastic strip plates (112).

6. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 5, characterized in that: The elastic expansion cylinder (11) is a truncated cone-shaped cylinder made of spring steel with a taper of 1°.

7. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 5, characterized in that: A through hole (113) is provided on the outer peripheral wall of the elastic expansion cylinder (11) corresponding to the top end of each strip-shaped dividing seam (111).

8. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 7, characterized in that: The bottom end of the strip-shaped dividing seam (111) extends to the bottom end of the elastic expansion cylinder (11) to form an opening.

9. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 1, characterized in that: The top outer peripheral wall of the expansion plug rod (2) is provided with an annular groove (21), and the bottom end thereof has an arc chamfer.

10. The device for sealing and separating the oil passage hole inside the speed regulator according to claim 1, characterized in that: The expansion plug rod (2) is a metal rod.

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