Inner hole sealing device for pipe parts

Abstract

The utility model belongs to the technical field of sealing, and particularly relates to an inner hole sealing device for pipe parts. The device comprises a stepped screw, the stepped screw is sequentially sleeved with a wedge block, a rubber plug and a base from top to bottom, the lower end of the rubber plug is arranged at the upper end of the base in a sleeved mode, the longitudinal section of the base is in an inverted-T shape, a channel A which is the same as the wedge block in shape is formed in the center in the rubber plug in the axial direction, and the size of the channel A is smaller than that of the wedge block. A pressing cover is arranged at the top of the wedge block, the center of the pressing cover is in threaded connection with the top of the stepped screw through a hexagon socket cap screw, the stepped screw is sleeved with a ball bearing, the ball bearing is located between the pressing cover and the wedge block, the lower end of the stepped screw is in threaded connection with a hexagon nut, and the hexagon nut is located below the base. The device solves the problem that sealing is difficult when grooves or holes exist in the end faces of the pipe parts, and is suitable for sealing operation of various pipe structures.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing, and in particular relates to an inner hole sealing device for pipe parts. Background Art

[0002] Currently, tubular components such as vehicle axles often require leak testing to verify their sealing performance. This involves sealing the inner holes at both ends of the tubular component, then ventilating it and immersing it in water to test for leaks. Conventional seals use an external buckle mechanism, sealing the outer end face of the tubular component. However, when the tubular component has grooves or holes on the end face, this external buckle seal cannot meet the requirements solely by sealing the outer end face, resulting in poor sealing performance. Utility Model Content

[0003] The utility model provides an inner hole sealing device for a pipe part, which solves the problem that the pipe part is difficult to seal when there are grooves or holes on the end surface thereof, and is applicable to sealing operations of various pipe structures.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] A device for sealing an inner hole of a pipe part comprises a stepped screw, wherein the stepped screw is sequentially sleeved with a wedge, a rubber plug and a base from top to bottom, the lower end of the rubber plug is sleeved on the upper end of the base, the longitudinal cross-section of the base is an inverted T-shape, the inner center of the rubber plug is axially provided with a channel A having the same shape as the outer shape of the wedge, the size of the channel A is smaller than the size of the wedge, a pressure cover is provided on the top of the wedge, the center of the pressure cover is connected to the top of the stepped screw by a hexagonal cylindrical head screw, a ball bearing is sleeved on the outside of the stepped screw, the ball bearing is located between the pressure cover and the wedge, the lower end of the stepped screw is threadedly connected to a hexagonal nut, and the hexagonal nut is located below the base.

[0006] Through the above technical solution, the hexagon socket head screw is used to fix the wedge and transmit the power of the stepped screw; the pressure cover is used to fix the ball bearing and the wedge, receive the power transmitted by the hexagon socket head screw and continue to transmit it downward; the ball bearing can prevent the wedge from getting stuck during rotation, resulting in incomplete sealing and loose fixation; the wedge can receive the downward power of the pressure cover and move downward, and the size difference between the wedge and the rubber plug enables the wedge to better wedge into the rubber plug and squeeze and tighten the rubber plug downward; the rubber plug can be deformed under the action of the wedge and the base, expand to the surroundings, and then connect to the rubber plug after expansion. It touches the wall of the pipe that needs to be sealed, and the rubber plug fills the pipe under the action of continuous deformation and friction to achieve sealing and fixation; the base plays a fixing role by contacting with the orifice of the pipe, and provides an upward extrusion force to the rubber plug; the hexagonal nut can receive external power and convert it into rotational power; the stepped screw can receive the rotational power of the hexagonal nut and convert it into horizontal force, and the stepped screw is connected to the M8 hexagon socket head screw through the threaded hole at the top, and the movement of the wedge is fixed through the first stepped part, and the movement of the ball bearing is fixed through the second stepped part.

[0007] Optionally, the base is provided with a through hole along the axial direction, the through hole is cylindrical, the upper end of the stepped screw passes through the through hole, the stepped screw is gap-fitted with the through hole, the diameter of the upper end surface of the base is smaller than the inner diameter of the pipe to be sealed, and the diameter of the lower end surface of the base is larger than the outer diameter of the pipe to be sealed.

[0008] Through the above technical solution, the upper end face is smaller than the diameter of the pipe, which is convenient for extending into the interior of the pipe, so that the wedge can be deformed and tightened at the appropriate position during operation; the lower end face is larger than the outer diameter of the pipe, which is convenient for fixing the entire sealing device. During operation, the lower end face is placed close to the end face of the pipe to be sealed, and the nut is tightened.

[0009] Optionally, the longitudinal cross-section of the channel A is an inverted isosceles trapezoid, a channel B is opened in the inner center of the wedge block, the channel B is cylindrical, the upper end of the stepped screw is gap-fitted with the inner side wall of the wedge block, a threaded hole is opened at the top of the stepped screw, and the lower end of the hexagon socket head screw is threadedly connected to the threaded hole.

[0010] Through the above technical solution, the cooperation between channel A and the wedge block enables the wedge block to squeeze channel A after being subjected to force, so that the rubber plug can expand and contact the pipe wall of the pipe to be sealed. The setting of the threaded hole can improve the firmness and stability of the connection between the stepped screw and the pressure cover.

[0011] Optionally, the hexagon socket head screw sleeve is provided with an annular screw gasket, the screw gasket is located between the hexagon socket head screw and the gland, and an annular gland gasket is provided between the gland and the top of the wedge block.

[0012] Through the above technical solution, the screw gasket is a rubber gasket, which can prevent gas and liquid from penetrating from the hexagon socket cylindrical head screw connection; the gland gasket is a rubber gasket, which can prevent liquid and gas from penetrating from the gland.

[0013] Optionally, the stepped screw is divided into four step portions with different diameters from top to bottom, and the diameters of the four step portions of the stepped screw increase successively from top to bottom. The first step portion and the second step portion of the stepped screw are located in the channel B, the third step portion of the stepped screw is located in the channel A, and the fourth step portion of the stepped screw is located in the through hole.

[0014] Through the above technical solution, the stepped screw is introduced from top to bottom. The first step part is a threaded hole on the top, which is convenient for connecting and fixing the pressure cover with screws; the second step part is a bearing step, which is used to limit the ball bearing; the third step part is the limit of the wedge block; the fourth step part is a threaded part, which is convenient for connecting the hexagonal nut.

[0015] Optionally, a groove A is opened at the top center of the wedge block, a groove B is opened at the bottom center of the pressure cover, the ball bearing is located in the groove A and the groove B, and the ball bearing is located in the first step portion of the stepped screw.

[0016] Through the above technical solution, groove A and groove B can limit the ball bearing and improve the stability of the ball bearing.

[0017] After adopting the above technical solution, the beneficial effects of the utility model are:

[0018] The sealing mechanism of this invention utilizes a rubber plug that expands under pressure and comes into contact with the pipe wall, achieving both fastening and sealing through friction and the rubber's sealing properties. The design of sealing from within the pipe makes the mechanism more versatile and suitable for a variety of pipe and shaft structures. The rubber plug design provides enhanced sealing performance. Operation is simple; simply insert the mechanism and tighten the hexagonal nut. For enhanced sealing, waterproof rubber gaskets are designed in areas prone to leakage. A ball bearing structure ensures smoother operation. The small volume exposed outside the workpiece is less likely to affect its processing and operation, making it suitable for a variety of scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 is a schematic cross-sectional structural diagram of the sealing device in the embodiment;

[0021] Figure 2 is a schematic diagram of the three-dimensional structure of the sealing device in the embodiment;

[0022] Figure 3 2. It is a schematic cross-sectional view of the sealing device sealing the axle housing shaft head in the embodiment;

[0023] Figure 4 2 is a schematic diagram of the cross-sectional structure of the stepped screw and the base in the embodiment;

[0024] Figure 5 Schematic diagram of the structure of the gland, wedge block and upper end of the stepped screw in the embodiment;

[0025] Figure 6 2. It is a schematic diagram of the cross-sectional structure of the rubber stopper under stress in the embodiment;

[0026] Figure 7 is an exploded view of the sealing device in the embodiment;

[0027] Figure 8 3 is a schematic diagram of the cross-sectional structure of the sealing device in the embodiment under the explosion state.

[0028] Explanation of the accompanying reference numerals: 1. Hexagon socket head screw; 2. Screw washer; 3. Pressure cap; 4. Pressure cap gasket; 5. Ball bearing; 6. Wedge; 7. Rubber plug; 8. Base; 9. Hexagonal nut; 10. Step screw; 11. First step portion; 12. Second step portion; 13. Third step portion; 14. Fourth step portion; 15. Bridge housing shaft head; 16. Through hole; 17. Channel A; 18. Channel B. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The present application discloses an inner hole sealing device for a pipe part, which is described by taking the shaft head sealing inspection at the insertion point of the drive axle housing half shaft as an example.

[0031] Example

[0032] according to Figures 1 to 8 As shown, a sealing device for the inner hole of a pipe part includes a wedge 6, a sealing fixing part, and a transmission part. The wedge 6 includes a hexagon socket head cap screw 1, a screw washer 2, a gland 3, a gland gasket 4, a ball bearing 5, and the wedge 6. The sealing fixing part includes a rubber plug 7, and the transmission part includes a base 8, a stepped screw 10, and a hexagonal nut 9. The hexagon socket head cap screw 1 is an M8 hexagon socket head cap screw, and the hexagonal nut 9 is an M16 hexagonal nut.

[0033] The base 8 is cylindrical, and the upper and lower end faces of the base 8 are both flat. The diameter of the upper end face of the base 8 is smaller than the diameter of the lower end face of the base 8. The diameter of the upper end face of the base 8 is smaller than the inner diameter of the pipe to be sealed, and the diameter of the lower end face of the base 8 is larger than the outer diameter of the pipe to be sealed.

[0034] A through hole 16 is opened in the axial direction of the base 8, and a stepped screw 10 is inserted into the through hole 16. The stepped screw 10 is divided into four stepped parts with different diameters from top to bottom. The diameters of the four stepped parts of the stepped screw 10 increase successively from top to bottom, and the stepped screw 10 is loosely matched with the through hole 16.

[0035] The lower end of the stepped screw 10 is threadedly connected to a hexagonal nut 9, which is located outside the through hole 16. The upper end of the base 8 is sleeved with a rubber plug 7, and the base 8 is in surface contact with the rubber plug 7. A channel A17 is axially opened in the center of the rubber plug 7. The longitudinal section of the channel A17 is an inverted isosceles trapezoid. The upper end of the stepped screw 10 passes through the through hole 16 and the channel A17 in sequence, and the upper end of the stepped screw 10 is located outside the rubber plug 7.

[0036] The upper end of the stepped screw 10 is sleeved with a wedge 6, and the stepped screw 10 is clearance-matched with the inner side wall of the wedge 6. The longitudinal section of the wedge 6 is an isosceles trapezoid. The size of the wedge 6 is larger than the size of the channel A17. A channel B18 is opened in the inner center of the wedge 6. The channel B18 is cylindrical. The upper end of the stepped screw 10 is located in the channel B18. A pressure cap 3 is provided on the top of the wedge 6. A hexagon socket head screw 1 is inserted in the center of the pressure cap 3. The lower end of the hexagon socket head screw 1 extends into the stepped screw 10. The stepped screw 1 0 is provided with a threaded hole on the top, and the lower end of the hexagon socket head screw 1 is threadedly connected to the threaded hole. The hexagon socket head screw 1 is provided with an annular screw gasket 2, which is located between the hexagon socket head screw 1 and the gland 3. An annular gland gasket 4 is provided between the gland 3 and the top of the wedge 6. A ball bearing 5 is placed between the top of the wedge 6 and the bottom of the gland 3. A groove A is provided in the center of the top of the wedge 6, and a groove B is provided in the center of the bottom of the gland 3. The ball bearing 5 is located in the groove A and the groove B.

[0037] The first step portion 11 and the second step portion 12 of the stepped screw 10 are located in the channel B18 , the third step portion 13 of the stepped screw 10 is located in the channel A17 , and the fourth step portion 14 of the stepped screw 10 is located in the through hole 16 .

[0038] The hexagon socket head screw 1 is used to fix the wedge 6 and transmit the power of the stepped screw 10; the screw gasket 2 is a rubber gasket, which can prevent gas and liquid from penetrating from the connection of the hexagon socket head screw 1; the pressure cover 3 is used to fix the ball bearing 5 and the wedge 6, receive the power transmitted by the hexagon socket head screw 1 and continue to transmit it downward; the pressure cover gasket 4 is a rubber gasket, which can prevent liquid and gas from penetrating from the pressure cover 3; the ball bearing 5 can prevent the wedge 6 from getting stuck during rotation, resulting in incomplete sealing and loose fixation; the wedge 6 can receive the downward power of the pressure cover 3 and move downward. The outer side of the wedge 6 is designed to be an angle of 30°, which is convenient for gradually opening the rubber plug 7, and can better wedge into the rubber plug 7 to squeeze and tighten the rubber plug 7 downward; the rubber The rubber plug 7 can be deformed by the force of both the wedge block 6 and the base 8, and expand in all directions. After expansion, it contacts the wall of the pipe to be sealed. Under the action of continuous deformation and friction, the rubber plug 7 fills the pipe to achieve sealing and fixation; the base 8 plays a fixing role by contacting with the orifice of the pipe, and provides an upward extrusion force to the rubber plug 7; the hexagonal nut 9 can receive external power and convert it into rotational power; the stepped screw 10 can receive the rotational power of the hexagonal nut 9 and convert it into horizontal force. The stepped screw 10 is connected to the M8 hexagon socket head screw through the threaded hole at the top, and fixes the movement of the wedge block 6 through the first stepped part, and fixes the movement of the ball bearing 5 through the second stepped part.

[0039] Working principle:

[0040] The half-axle of the drive axle mainly connects the differential with the drive wheel and works inside the drive axle, and the inside of the drive axle is filled with gear oil, so the sealing performance of the axle housing shaft head 15 where the half-axle is inserted needs to be tested.

[0041] The principle of this device is: when the hexagonal nut 9 is screwed, the stepped screw 10 receives the power of the hexagonal nut 9 and moves downward, driving the wedge block 6 to move partially downward, and the wedge block 6 contacts the rubber plug 7 to tighten it and expand it. After the rubber plug 7 expands, it contacts the tube wall of the bridge housing shaft head 15, and uses friction and the sealing performance of rubber to achieve tightening and sealing.

[0042] When the transmission part is working, the base 8 contacts the pipe hole of the axle housing shaft head 15 and remains stationary. Turn the hexagonal nut 9, which converts the rotation through the thread into the horizontal movement of the stepped screw 10 to the left. Figure 3 and Figure 4 shown.

[0043] The working of the sealing and fixing part is as follows: when the device is working, the rubber plug 7 is squeezed downward by the wedge block 6 and pressed upward by the base 8. Under the action of both the wedge block 6 and the base 8, the rubber plug 7 is deformed by force and expands to the surroundings. After expansion, it contacts the pipe wall. Under the action of continuous deformation and friction, the rubber plug 7 fills the pipe to achieve sealing and fixation.

[0044] The wedge block 6 mainly receives the downward power transmitted by the stepped screw 10 to continue moving downward, compressing the rubber plug 7 and preventing liquid from penetrating from the wedge block 6.

[0045] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An inner hole sealing device for a pipe part, characterized in that: It includes a stepped screw, which is sequentially sleeved with a wedge, a rubber plug and a base from top to bottom. The lower end of the rubber plug is sleeved on the upper end of the base. The longitudinal cross-section of the base is an inverted T-shape. The inner center of the rubber plug is axially opened with a channel A with the same shape as the outer shape of the wedge. The size of the channel A is smaller than the size of the wedge. A pressure cover is provided on the top of the wedge. The center of the pressure cover is connected to the top of the stepped screw through a hexagonal cylindrical head screw. A ball bearing is sleeved on the outside of the stepped screw, and the ball bearing is located between the pressure cover and the wedge. The lower end of the stepped screw is threadedly connected with a hexagonal nut, and the hexagonal nut is located below the base.

2. The inner hole sealing device of a pipe part according to claim 1, characterized in that: The base is provided with a through hole along the axial direction, and the through hole is cylindrical. The upper end of the stepped screw passes through the through hole, and the stepped screw is loosely fitted with the through hole. The diameter of the upper end surface of the base is smaller than the inner diameter of the pipe to be sealed, and the diameter of the lower end surface of the base is larger than the outer diameter of the pipe to be sealed.

3. The inner hole sealing device of a pipe part according to claim 2, characterized in that: The longitudinal cross-section of the channel A is an inverted isosceles trapezoid, and a channel B is provided in the inner center of the wedge block. The channel B is cylindrical, and the upper end of the stepped screw is clearance-matched with the inner side wall of the wedge block. A threaded hole is provided at the top of the stepped screw, and the lower end of the hexagon socket head screw is threadedly connected to the threaded hole.

4. The inner hole sealing device of a pipe part according to claim 1, characterized in that: The hexagon socket head screw sleeve is provided with an annular screw gasket, which is located between the hexagon socket head screw and the gland. An annular gland gasket is provided between the gland and the top of the wedge block.

5. The inner hole sealing device of a pipe part according to claim 3, characterized in that: The stepped screw is divided into four stepped portions with different diameters from top to bottom, and the diameters of the four stepped portions of the stepped screw increase successively from top to bottom. The first stepped portion and the second stepped portion of the stepped screw are located in the channel B, the third stepped portion of the stepped screw is located in the channel A, and the fourth stepped portion of the stepped screw is located in the through hole.

6. The inner hole sealing device of a pipe part according to claim 5, characterized in that: A groove A is provided at the top center of the wedge block, a groove B is provided at the bottom center of the pressure cover, the ball bearing is located in the groove A and the groove B, and the ball bearing is located at the first step portion of the stepped screw.

Images