Plugging and separating device for oil way hole in speed regulator

Abstract

The invention discloses a blocking and separating device for an oil way hole in a speed regulator, and relates to the technical field of speed regulator pressure maintaining tests. A strip-shaped hole is formed in one outer wall face of a speed regulator body, and a plurality of oil passing channels in the speed regulator body penetrate through and communicate with the strip-shaped hole; the communication positions of the multiple oil passing channels and the strip-shaped hole are arranged at intervals in the length direction of the strip-shaped hole, and the device comprises an expansion cylinder, and a plurality of sealing convex rings capable of expanding and shrinking in the radial direction are coaxially arranged on the peripheral wall of the expansion cylinder; the multiple sealing convex rings are arranged at intervals in the axial direction of the expansion cylinder. One end of the expansion plug rod can be inserted from a barrel opening in the top end of the expansion barrel, so that the barrel wall, inserted into the strip-shaped hole, of the expansion barrel expands, and then the multiple sealing convex rings are all plugged in the strip-shaped hole; a plurality of communicating channels communicating with the oil passing channels in a one-to-one correspondence mode 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 is simple in structure, convenient to mount and dismount, resistant to high pressure, reliable and stable.

Description

Technical Field

[0001] The invention relates to the technical field of speed regulator pressure-maintaining test, and in particular to a blocking and separating device for an oil passage hole inside a speed regulator. Background Art

[0002] In order to verify whether there are casting defects in the oil circuit inside the speed regulator body, it is necessary to use a manual hydraulic pump to perform pressure-maintaining tests on each oil circuit inside the speed regulator in turn, and a certain oil pressure must be maintained for a short period of time. Parts of the cast oil passages (oil circuits) inside the speed regulator body are connected by strip holes formed by machine processing. When each oil passage is independently subjected to a pressure-maintaining test, each oil passage needs to be separated so that each oil passage remains independent. In order to achieve the independence of each oil passage inside the speed regulator body, it is necessary to design a sealing and separation device for the oil circuit holes inside the speed regulator. The currently commonly used method is to use multiple O-rings placed in the strip holes to seal the strip holes in turn and separate each oil passage to prevent adjacent oil passages from being connected through the strip holes; see Figure 1 , an iron ring 34 is placed between adjacent O-rings 33 (an annular groove 341 is provided in the middle of the outer peripheral wall of the iron ring 34 to keep the same oil passage of the corresponding strip hole 32 connected) and then pressed to flatten and expand the O-ring 33 to seal the strip hole 32, and then multiple separation sections are formed at axial intervals of the strip hole 32 to separate the oil passages 31. However, due to the presence of metal sharp edges at the position of the drilled strip hole, the O-ring may be sheared and scratched by the metal sharp edges when entering, thereby reducing the sealing performance; in addition, during the test, the oil pressure is ≥12MPa, and external pressure needs to be applied to flatten and expand the O-ring so that it can block the oil pressure during the test. The O-ring may also be crushed during the expansion process, resulting in the adjacent oil passages being connected, affecting the test results and making the pressure test process difficult.

[0003] To this end, according to the structural characteristics of the oil passage and the strip hole inside the speed regulator body, it is an urgent problem for technical personnel in this field to design an oil passage blocking and separation device that is suitable for entering the strip hole, easy to disassemble and assemble, and resistant to high pressure. Summary of the invention

[0004] In view of this, the present invention proposes a sealing and separating device for the internal oil passage holes of a speed regulator, aiming to solve the technical problems in the pressure test of the internal oil passages of the above-mentioned traditional speed regulator, that is, the method of sealing and separating the oil passages by using O-rings has poor sealing effect, is inconvenient to disassemble and assemble, and has poor high pressure resistance.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a blocking and separating device for an oil passage hole inside a speed regulator, wherein a strip hole is provided on an outer wall surface of a speed regulator body, and a plurality of oil passages inside the speed regulator body all penetrate the hole peripheral wall of the strip hole and communicate with the strip hole, and the communicating positions of the plurality of oil passages and the strip hole are arranged at intervals along the length direction of the strip hole, comprising:

[0007] An expansion cylinder, wherein the bottom end of the expansion cylinder can be inserted into the strip hole from the opening of the strip hole; a plurality of sealing convex rings that can expand and contract radially are coaxially arranged on the outer peripheral wall of the expansion cylinder; the plurality of sealing convex rings are spaced apart along the axial direction of the expansion cylinder;

[0008] An expansion plug rod, one end of which can be inserted from the top end of the expansion cylinder to expand the cylinder wall of the expansion cylinder inserted into the strip hole, thereby making the multiple sealing convex rings all sealed in the strip hole, and forming a plurality of connecting channels that correspond to the multiple oil passage channels between the outer wall of the expansion cylinder and the inner wall of the strip hole and between any adjacent two sealing convex rings.

[0009] When the sealing and separating device for the internal oil passage hole of the speed regulator provided by the present invention is used, the bottom end of the expansion cylinder is first inserted into the bottom of the strip hole, and then one end of the expansion plug rod is gradually inserted into the cylinder cavity from the top end of the expansion cylinder. Under the squeezing of the expansion plug rod, the expansion cylinder expands radially, and then each sealing convex ring expands. The outer peripheral wall surface of each sealing convex ring is adapted to be tightly pressed against the inner wall surface of the strip hole to achieve sealing and plugging; at this time, a connecting channel is formed between the outer wall surface of the expansion cylinder and the inner wall surface of the strip hole and between any two adjacent sealing convex rings. The function of each connecting channel is to connect a corresponding oil passage to ensure that the oil passage is unobstructed during pressure testing, but any two adjacent oil passages in the strip hole are blocked by corresponding sealing convex rings to avoid oil leakage between adjacent oil passages under high pressure testing. After the test is completed, pull out the expansion plug rod, and then take out the expansion cylinder. The device of the present invention is easy to install and disassemble and is resistant to high pressure. It can effectively seal and isolate the oil passage at the corresponding strip hole on the speed regulator body; and the ring hole of the sealing convex ring has stronger pressure resistance under the support of the expansion plug rod, so that the reliability of sealing and isolation is better.

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

[0011] The cylinder cavity of the elastic expansion cylinder is a tapered cylinder cavity which gradually narrows from the top to the bottom; a plurality of annular protrusions are coaxially connected to the outer peripheral wall of the elastic expansion cylinder; the plurality of annular protrusions are arranged at intervals along the axial direction of the elastic expansion cylinder;

[0012] The flexible sealing sleeve is adapted to fit the outer peripheral wall of the elastic expansion cylinder and forms a radially expandable and contractible sealing convex ring corresponding to the annular convex block; one end of the expansion plug rod can be inserted from the top end of the elastic expansion cylinder to expand it.

[0013] The beneficial effects of the above technical solution are: the elastic expansion cylinder serves as a supporting frame of the flexible sealing sleeve, plays a role in supporting and shaping the flexible sealing sleeve, and the portion of the flexible sealing sleeve corresponding to the annular convex block forms a sealing convex ring, which is more stable and resistant to high pressure under the support of the annular convex block; the flexible sealing sleeve is directly pressed and fits on the inner wall of the strip hole, playing a sealing role. The expansion cylinder has a simple structure, is easy to manufacture and has low cost.

[0014] As a further improvement of the above technical solution, the expansion cylinder also includes a guide cylinder; the guide cylinder is a trumpet-shaped body that gradually expands from the bottom end to the top end; the bottom end of the guide cylinder is coaxially adapted and fixed to the top end of the elastic expansion cylinder.

[0015] The beneficial effect of the above technical solution is that the bell-shaped guide cylinder plays a role in guiding the insertion of the expansion plug rod.

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

[0017] As a further improvement of the above technical solution, the outer peripheral wall of the elastic expansion cylinder is provided with a plurality of strip dividing slits along the length direction, and the plurality of strip dividing slits are evenly distributed along the circumference of the elastic expansion cylinder to divide the cylinder wall of the elastic expansion cylinder into a plurality of elastic strips, and to divide the plurality of annular protrusions into expansion plug protrusions distributed on the corresponding elastic strips.

[0018] The beneficial effect of the above technical solution is: the elastic expansion cylinder is divided by a plurality of strip-shaped dividing seams to form a plurality of elastic strips that can be expanded and reset independently, and the expansion plug protrusions on the plurality of elastic strips are jointly enclosed to form an annular protrusion. During use, the elastic strips are radially opened under the squeezing 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 while its own structural shape remains stable, which can make the supporting structure of the composed 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 truncated cone-shaped cylinder made of spring steel with a taper of 1°.

[0020] The beneficial effects of the above technical solution are: the truncated cone-shaped elastic expansion cylinder is more convenient to insert into the strip hole, and can fit tightly into the strip hole after the elastic expansion cylinder is expanded.

[0021] As a further improvement of the above technical solution, a through hole is provided on the outer peripheral wall of the elastic expansion cylinder corresponding to the top of each strip-shaped dividing seam.

[0022] The beneficial effect of the above technical solution is that the through hole at the top of the strip-shaped dividing seam can facilitate the expansion, contraction and opening and closing of the elastic strip.

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

[0024] The beneficial effect of the above technical solution is that the bottom opening of the strip-shaped dividing seam can facilitate the smooth insertion and removal of the expansion plug.

[0025] As a further improvement of the above technical solution, an annular groove is provided on the outer peripheral wall at the top of the expansion plug rod, and the bottom end thereof has an arc chamfer.

[0026] The beneficial effects of the above technical solution are: the arc chamfered structure at the bottom of the expansion plug rod facilitates its smooth insertion into the barrel cavity of the expansion cylinder; the annular groove at the top of the expansion plug rod facilitates the removal of the expansion plug rod.

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

[0028] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a blocking and separating device for the internal oil passage hole of the speed regulator, which has the following advantages and beneficial effects:

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

[0030] 2. After the use of the sealing and separating device for the oil passage inside the speed regulator of the present invention is completed and the expansion plug rod is pulled out, the elastic strip plate can be automatically and reliably reset under its own elastic force and the contraction elastic force of the flexible sealing sleeve, and can be repeatedly used; the truncated cone-shaped elastic expansion cylinder with a tapered cylinder cavity can be inserted into the strip hole more smoothly, and can avoid being scratched by the metal sharp edges at the opening of the strip hole and the opening of the oil passage in the hole during the insertion process.

[0031] 3. Under the push of the expansion rod, each expansion plug protrusion on the elastic expansion cylinder of the present invention opens radially to drive the flexible sealing sleeve to radially press the sealing strip hole, so that the radial pressing force is stronger and the sealing effect is better; thereby effectively overcoming the technical defects of the traditional O-ring that the radial expansion and pressing is achieved by axial flattening, which has insufficient radial supporting force and causes poor sealing effect and poor pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a blocking and separating device for an oil passage hole inside a speed regulator in the prior art;

[0034] Figure 2 A schematic diagram of the expansion cylinder of the device for blocking and separating the oil passage hole inside the speed regulator according to the present invention being installed in the strip hole;

[0035] Figure 3 The present invention Figure 2 A is an enlarged schematic diagram of the structure;

[0036] Figure 4 A schematic diagram of the structure of the elastic expansion cylinder and the guide cylinder of the device for blocking and separating the oil passage hole inside the speed regulator according to the present invention;

[0037] Figure 5 A schematic diagram of a state in which a flexible sealing sleeve of the device for blocking and separating the oil passage hole inside the speed regulator according to the present invention is sleeved on an elastic expansion cylinder;

[0038] Figure 6 A schematic top view of an expansion cylinder of a device for sealing and separating an oil passage hole inside a speed regulator according to the present invention;

[0039] Figure 7 A schematic diagram of a state in which an expansion plug rod of a device for plugging and separating an oil passage hole inside a speed regulator according to the present invention is inserted into an expansion cylinder;

[0040] In the figure: 1, expansion cylinder; 11, elastic expansion cylinder body; 111, strip dividing seam; 112, elastic strip plate; 1121, expansion plug convex block; 1122, annular convex block; 113, through hole; 12, flexible sealing sleeve; 121, sealing convex ring; 1211, connecting channel; 13, guide cylinder body; 2, expansion plug rod; 21, annular groove; 3, speed regulator body; 31, oil passage; 32, strip hole; 33, O-ring; 34, iron ring; 341, annular groove; 35, T-bar; 36, annular pressure block. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] like Figure 1 As shown, a strip hole 32 is opened on a wall surface of the speed regulator body 3, and the middle parts of multiple oil passages 31 inside the speed regulator body 3 all penetrate the hole wall of the strip hole 32 and are connected with the strip hole 32, and the connecting positions of the multiple oil passages 31 and the strip hole 32 are arranged at intervals along the length direction of the strip hole 32.

[0046] The method commonly used in the existing sealing and separation device of the oil passage inside the speed regulator body is to use multiple O-rings 33 placed in the strip holes 32 to seal the strip holes 32 in turn and separate each oil passage 31 to prevent adjacent oil passages 31 from connecting through the strip holes 32; an iron ring 34 is placed between adjacent O-rings 33, and an annular groove 341 is opened in the middle of the outer peripheral wall of the iron ring 34 to keep the same oil passage 31 on both sides of the corresponding strip hole 32 connected, and then the annular pressure block 36 is pressed to flatten and expand the O-ring 33 to achieve axial sealing of the strip hole 32, and then multiple separation sections are formed at axial intervals of the strip hole 32 to achieve separation between adjacent oil passages 31, so as to avoid adjacent oil passages 31 from connecting and leaking at the strip hole 32 during pressure application, thereby affecting the reliability of the test results. During the test, the annular pressure block 36, O-ring 33 and iron ring 34 are placed as shown in the figure. Figure 1 As shown, the sleeve is arranged on the T-bar 35 and is placed in the strip hole 32 together, so that the annular groove 341 of the iron ring 34 corresponds to the oil channel opening of the corresponding oil channel 31; one of the oil channels 31 is taken as the test oil channel, one port of the test oil channel is closed and the test oil is input from the other port and pressurized, while the ports of the other oil channels 31 are kept open; if the input test oil leaks out from the ports of other oil channels 31, it means that there is a connected crack or sand hole between the test oil channel and the leaking oil channel 31 in the governor body 3; if the pressure fluctuation of the test oil channel meets the requirements after the pressure holding test, it means that the test oil channel is normal, and the quality of the governor body can be judged by performing pressurization and pressure holding tests one by one.

[0047] According to an embodiment of the present invention, Figures 2 to 7 As shown, a device for sealing and separating the oil passage hole inside the speed regulator comprises: 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 hole 32 from the opening of the strip hole 32; the outer peripheral wall of the expansion cylinder 1 is coaxially provided with a plurality of radially expandable and contractible sealing convex rings 121; the plurality of sealing convex rings 121 are arranged at intervals along the axial direction of the expansion cylinder 1. One end of the expansion plug 2 can be inserted from the top opening of the expansion cylinder 1 to expand the cylinder wall of the expansion cylinder 1 inserted into the strip hole 32, thereby making the plurality of sealing convex rings 121 all blocked in the strip hole 32, and forming a plurality of communication channels 1211 corresponding to the plurality of oil passage channels 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.

[0049] When the sealing and separating device for the internal oil path hole of the speed regulator provided in this embodiment is used, the bottom end of the expansion cylinder 1 is first inserted into the bottom of the strip hole 32, and then one end of the expansion plug rod 2 is gradually inserted into the cylinder cavity of the expansion cylinder 1 from the top cylinder mouth. Under the squeezing of the expansion plug rod 2, the expansion cylinder 1 expands radially, and then each sealing convex ring 121 expands, and the outer peripheral wall surface of each sealing convex ring 121 is adapted to be tightly pressed against the inner wall surface of the strip hole 32 to achieve sealing and plugging; at this time, a connecting channel 1211 is formed between the outer wall surface of the expansion cylinder 1 and the inner wall surface of the strip hole 32 and between any two adjacent sealing convex rings 121. The function of each connecting channel 1211 is to connect a corresponding oil passage 31 to ensure that the oil passage 31 is unobstructed during pressure testing, but any two adjacent oil passages 31 in the strip 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 taken out. The device of the present invention is easy to install and disassemble and is resistant to high pressure, and can effectively block and isolate the oil passage 31 at the corresponding strip hole 32 on the governor body 3; and the ring hole of the sealing convex ring 121 has a stronger pressure resistance under the support of the expansion plug rod 2, so that the reliability of blocking 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 11 is a tapered cylinder cavity that gradually narrows from the top to the bottom; a plurality of annular protrusions 1122 are coaxially 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;

[0052] The flexible sealing sleeve 12 is adapted to fit the outer peripheral wall of the elastic expansion cylinder 11 and forms a radially expandable sealing convex ring 121 at the corresponding 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.

[0053] The elastic expansion cylinder 11 serves as a supporting frame of the flexible sealing sleeve 12, and plays a role in supporting and shaping the flexible sealing sleeve 12. The portion of the flexible sealing sleeve 12 corresponding to the annular protrusion 1122 forms a sealing protrusion 121. The sealing protrusion 121 is more stable and can withstand high pressure under the support of the annular protrusion 1122. The flexible sealing sleeve 12 is directly pressed and fits on the inner wall of the strip hole 32, which plays a sealing role. The expansion cylinder 1 has a simple structure, is easy to manufacture and has low cost.

[0054] In some embodiments, the elastic expansion cylinder 11 can be designed as a rubber sleeve or a plastic sleeve that is elastic and radially expandable and contractible.

[0055] In some embodiments, the expansion cylinder 1 further includes a guide cylinder 13; the guide cylinder 13 is a trumpet-shaped cylinder that gradually expands from the bottom to the top; the bottom end of the guide cylinder 13 is coaxially adapted and fixed to the top of the elastic expansion cylinder 11. The trumpet-shaped guide cylinder 13 serves to guide the expansion plug rod 2 to be inserted.

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

[0057] In some embodiments, a plurality of strip-shaped dividing slits 111 are opened on the outer wall of the elastic expansion cylinder 11 along the length direction, and the plurality of strip-shaped dividing slits 111 are evenly distributed along the circumference of the elastic expansion cylinder 11 to divide the cylinder wall of the elastic expansion cylinder 11 into a plurality of elastic strips 112, and to divide a plurality of annular protrusions 1122 into expansion protrusions 1121 distributed on the corresponding elastic strips 112.

[0058] The elastic expansion cylinder 11 is divided by a plurality of strip-shaped dividing seams 111 to form a plurality of elastic strips 112 that can be expanded and reset independently, and the expansion plug protrusions 1121 on the plurality of elastic strips 112 are jointly enclosed to form an annular protrusion 1122. During use, the elastic strips 112 are radially opened under the squeezing and pushing of the expansion plug rod 2, thereby driving each expansion plug protrusion 1121 to move radially to provide radial support force for the flexible sealing sleeve 12; each expansion plug protrusion 1121 only moves radially while its own structural shape remains stable, so that the supporting structure of the formed annular protrusion 1122 can be made more stable, thereby improving the pressure resistance of the device.

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

[0060] In some embodiments, the elastic expansion cylinder 11 is a truncated cone-shaped cylinder made of spring steel with a taper of 1°; the outer diameter of the top of the elastic expansion cylinder 11 is less than or equal to the diameter of the strip hole 32 .

[0061] The truncated cone-shaped elastic expansion cylinder 11 is more convenient to be inserted into the strip hole 32 , and can fit tightly into the strip hole 32 after the elastic expansion cylinder 11 is expanded.

[0062] In some embodiments, a through hole 113 is formed on the outer peripheral wall of the elastic expansion cylinder 11 corresponding to the top of each strip-shaped dividing seam 111 .

[0063] The through hole 113 is provided at the top of the strip-shaped dividing seam 111 to facilitate the expansion, contraction and opening and closing of the elastic strip plate 112 .

[0064] In some embodiments, 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.

[0065] The bottom 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 rod 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 rod 2 is a round rod made of 45# steel. Before blocking the oil passage, in order to ensure that the metal rod can smoothly enter the expansion cylinder, the outer surface of the insertion portion thereof guarantees a certain roughness requirement, that is, a certain smoothness, and lubricating oil can also be applied before inserting into the expansion cylinder to facilitate the insertion and removal of the metal rod; the outer diameter of the expansion plug rod 2 can be the same as the inner diameter of the top end of the elastic expansion cylinder 11.

[0070] It should be noted that the elastic expansion cylinder 11 is made of 60Si2Mn spring steel, and the hardness is 55-60HRC after heat treatment, with good wear resistance and toughness. In order to ensure that the expansion plug rod 2 can smoothly enter the elastic expansion cylinder 11 and be taken out, and the flexible sealing sleeve 12 can be smoothly sleeved on the elastic expansion cylinder 11, the inner hole and outer circle of the elastic expansion cylinder 11 are smoothed to ensure certain roughness requirements. In order to ensure that the elastic expansion cylinder 11 with the flexible sealing sleeve 12 smoothly enters 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 set 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 make the inner cavity surfaces of the two smoothly transition and connect, and 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 sleeved on the elastic expansion cylinder 11 to ensure that it can tightly adhere to the outer peripheral wall of the elastic expansion cylinder 11; the flexible sealing sleeve 12 can be replaced when its quality deteriorates and the sealing effect decreases.

[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 holes 32 and the intervals between adjacent oil passages 31 .

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

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 surface of a speed regulator body (3), a plurality of oil passages (31) inside the speed regulator body (3) all penetrate the peripheral wall of the strip hole (32) and communicate with the strip hole (32), and the communicating 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 arranged 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 connecting channels (1211) that are connected to the multiple oil passage channels (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 blocking and separating device for an 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; the outer peripheral wall of the elastic expansion cylinder (11) is coaxially and integrally connected with a plurality of annular protrusions (1122); 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) at a position 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 blocking and separating device for an 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. A blocking and separating device for an oil passage hole inside a speed regulator according to claim 2, characterized in that: The flexible sealing sleeve (12) is a silicone or rubber sealing sleeve.

5. A blocking and separating device for an oil passage hole inside a 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 length 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 plugging protrusions (1121) distributed on the corresponding elastic strip plates (112).

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

7. A blocking and separating device for an oil passage hole inside a 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. A blocking and separating device for an oil passage hole inside a 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. A blocking and separating device for an oil passage hole inside a 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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