Air tightness detection device for shaft seat

Abstract

The utility model discloses an air tightness detection device for a shaft seat, which relates to the technical field of casting production and comprises a sealing shaft, a sealing seat is arranged at one end of the sealing shaft, a connecting hole is formed in the center of the sealing seat, a sealing cover is arranged on one side of the sealing seat, and a screw is arranged at the position, corresponding to the connecting hole, of the sealing cover. The sealing cover is in threaded connection with the sealing shaft through a screw rod, a locking pad is arranged at the other end of the sealing shaft, and the locking pad and the sealing seat are used for blocking and sealing the two sides of the floating sealing chamber; the sealing seat is further provided with an inflating nozzle used for pressurizing the interior of the floating sealing chamber and a pressure gauge used for detecting the pressure of the floating sealing chamber. According to the utility model, through the arrangement of the sealing shaft, the sealing seat, the sealing cover and the locking pad, the two sides of the floating sealing chamber can be sealed, and the detection of the sealing performance of the floating sealing chamber is realized through the cooperation of the inflating nozzle and the pressure gauge, so that the operation is simple, and the sealing performance of the floating sealing chamber is improved. And the detection efficiency and quality are high.

Description

Technical Field

[0001] The utility model relates to the technical field of casting production, in particular to an air tightness detection device for an axle seat. Background Art

[0002] The guide wheel is an important component in the travel system of large-scale construction machinery such as excavators. It is installed on the crawler to guide the crawler. Its main function is to guide the crawler to wind correctly. At the same time, the tensioning device is used to move the guide wheel to adjust the tension of the crawler. Therefore, the guide wheel is both the guide wheel of the crawler and the tensioning wheel in the tensioning device.

[0003] The guide wheel bracket of the excavator is used for installing the guide wheel. The guide wheel bracket is produced by casting, and a floating seal chamber is processed at the axis position. The floating seal chamber is mainly used for floating oil seal.

[0004] Floating oil seals are also commonly called permanent seals, double cone oil seals or annular oil seals, etc. They are mainly used in engineering machinery and working conditions with harsh working conditions and severe wear. Floating oil seals are generally composed of a pair of wear-resistant floating seal rings and a pair of rubber rings. They are assembled in a special sealing cavity - the floating seal seat. The floating seal ring is an axially saddle-shaped floating end face sealing ring made of iron alloy material. The rubber ring is a rubber ring with a circular axial cross-section and a thicker cross-sectional diameter.

[0005] If the floating oil seal is installed in the floating seal chamber, poor air tightness will lead to oil leakage, which will in turn aggravate the wear between the guide wheel and the guide wheel bracket, thereby shortening the service life of the equipment. The existing detection device has high requirements on the workers' skill level during operation, and the entire device has a large number of parts and takes a long time to assemble, which reduces the efficiency and quality of the detection.

[0006] Therefore, the utility model proposes an air tightness detection device for a shaft seat, which is used to simplify the operating steps of air tightness detection of a floating seal chamber and improve detection efficiency and quality. Utility Model Content

[0007] In view of the above technical problems, the utility model provides an air tightness detection device for an axle seat, which is used to solve the problems that the existing detection devices have complicated operation steps and many components resulting in low detection efficiency and quality.

[0008] The above technical objectives of the utility model are achieved through the following technical solutions:

[0009] An air tightness detection device for a shaft seat, comprising a sealing shaft, a sealing seat is provided at one end of the sealing shaft, a connecting hole is opened at the center of the sealing seat, a sealing cover is provided on a side of the sealing seat away from the sealing shaft, a screw is provided at a position of the sealing cover corresponding to the connecting hole, the sealing cover is threadedly connected to the sealing shaft through the screw, a locking pad is provided at the other end of the sealing shaft, and the locking pad and the sealing seat are used to seal both sides of a floating seal chamber;

[0010] The sealing seat is also provided with an air-injection nozzle for pressurizing the floating seal chamber and a pressure gauge for detecting the pressure of the floating seal chamber;

[0011] A first sealing ring is arranged on the outer wall of the sealing shaft, and a second sealing ring is arranged on the sealing seat and located outside the floating sealing chamber.

[0012] Furthermore, a receiving hole is formed through the sealing shaft near the screw rod, a connecting shaft is welded and fixed in the receiving hole, and a threaded hole is formed on the connecting shaft at a concentric position of the screw rod, and the threaded hole is matched with the screw rod thread.

[0013] Furthermore, one end of the connecting shaft extends beyond the accommodating hole.

[0014] Furthermore, a T-shaped clamp is welded on one end of the connecting shaft located at the locking pad, and the T-shaped clamp is used to engage with the locking pad.

[0015] Furthermore, the sealing seat comprises a base plate, a sealing ring is provided on a side of the base plate close to the sealing shaft, and the inner diameter of the sealing ring is greater than the outer diameter of the floating seal chamber.

[0016] Furthermore, the outer wall of the sealing ring is sloped, and the height decreases gradually in the direction away from the substrate.

[0017] Furthermore, a first sealing groove is formed on the outer wall of the sealing shaft, and the first sealing ring is installed in the first sealing groove.

[0018] Furthermore, a second sealing groove is provided on the outer side of the sealing ring, and a second sealing ring is installed in the second sealing groove.

[0019] Furthermore, the diameter of the locking gasket is larger than the inner diameter of the floating seal chamber, and the diameter of the sealing seat is larger than the outer diameter of the floating seal chamber.

[0020] In summary, the beneficial technical effects of the utility model are:

[0021] (1) The screw on the sealing cover is connected to the sealing shaft, so that the sealing seat and the locking gasket can be tightened and sealed to the two ends of the floating seal chamber. At the same time, the first sealing ring and the second sealing ring are used to make the floating seal chamber in a sealed state. At the same time, the pressure is pumped into the floating seal chamber through the air pump nozzle, and the pressure in the floating seal chamber is detected by the pressure gauge. During the entire detection process, the assembly steps of the detection device are simple and easy to use, and the skill requirements for workers are low, which indirectly improves the efficiency and quality of the airtightness detection of the floating seal chamber.

[0022] (2) The use of the connecting shaft reduces the space occupied by the entire sealing shaft in the floating seal chamber, thereby increasing the volume and pressure of air flowing into the floating seal chamber, ensuring that the floating seal chamber can be tested at a higher pressure, thereby improving the quality of the test.

[0023] (3) By utilizing the clamping fit between the T-shaped clamp and the locking pad, the locking pad can be quickly replaced after being deformed during the detection process, thereby ensuring the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of the guide wheel bracket;

[0025] Figure 2 It is a schematic diagram of the assembly of the utility model;

[0026] Figure 3 It is a schematic diagram of the structure of the sealing shaft;

[0027] Figure 4 It is a structural schematic diagram of the sealing seat;

[0028] Figure 5 1 is a schematic diagram of the structure of the sealing cover;

[0029] Figure 6 It is a schematic diagram of the structure of the locking pad;

[0030] Figure 7 It is a schematic diagram of the use of the utility model;

[0031] Figure 8 yes Figure 7 A magnified schematic diagram of part A.

[0032] Figure numerals: 1. guide wheel bracket; 2. floating seal chamber; 3. sealing shaft; 4. sealing seat; 5. sealing cover; 6. locking gasket; 7. T-shaped clamp; 8. connecting shaft; 9. threaded hole; 10. first sealing groove; 11. first sealing ring; 12. base plate; 13. connecting hole; 14. sealing ring; 15. second sealing groove; 16. second sealing ring; 17. cover plate; 18. screw; 19. air nozzle; 20. pressure gauge; 21. U-shaped bayonet; 22. third sealing ring. DETAILED DESCRIPTION

[0033] The present invention will be described clearly and completely below in conjunction with the embodiments.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "disposed", "connected" 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 it can be connected through an intermediate medium, or it can be a communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] See attached Figure 1 As shown, a guide wheel bracket 1 for an excavator has a circular floating seal chamber 2 penetrating the center of the guide wheel bracket 1. The floating seal chamber 2 is used to install a floating oil seal. Before installing the floating oil seal, the air tightness of the floating seal chamber 2 needs to be tested to ensure that there is no oil leakage after the floating oil seal is installed.

[0037] See attached Figure 2-6 , shown is an air tightness detection device for a shaft seat, which is used to detect the air tightness of a floating seal chamber 2, and specifically includes a sealing shaft 3 sleeved in the floating seal chamber 2, a receiving hole is provided through the center of the sealing shaft 3, a connecting shaft 8 is welded and fixed in the receiving hole, one end of the connecting shaft 8 extends out of the receiving hole, wherein a threaded hole 9 is provided at the center of the connecting shaft 8, a sealing cover 5 is provided on one side of the sealing shaft 3, the sealing cover 5 includes a cover plate 17, a screw 18 is provided at the center of the cover plate 17 and on one side close to the connecting shaft 8, the screw 18 cooperates with the threaded hole 9 to realize the connection between the sealing cover 5 and the sealing shaft 3, and a sealing seat 4 is provided between the sealing shaft 3 and the sealing cover 5;

[0038] The sealing seat 4 includes a base plate 12, which is basically circular and has a diameter larger than the outer diameter of the floating seal chamber 2. The base plate 12 is located at the position of the floating seal chamber 2 and is respectively provided with an air pump 19 for pressurization and a pressure gauge 20 for detecting the pressure in the floating seal chamber 2. At the same time, a sealing ring 14 is provided on the side of the base plate 12 close to the sealing shaft 3. The inner diameter of the sealing ring 14 just accommodates the outer diameter of the floating seal chamber 2. When in use, the sealing seat 4 is sealed by fitting the sealing ring 14 on the outer circle of the floating seal chamber 2, and at the same time, one side of the base plate 12 abuts against the port of the floating seal chamber 2 to achieve blocking of one side of the floating seal chamber 2. At the same time, a connecting hole 13 is opened at the central position of the base plate 12. When installing the sealing seat 4, the sealing seat 4 is firstly fitted on the outer circle of the floating seal chamber 2, and then the screw 18 of the sealing cover 5 passes through the connecting hole 13 to achieve connection with the threaded hole 9. In this way, the sealing seat 4 is clamped between the cover plate 17 and the sealing shaft 3 by the sealing cover 5.

[0039] In addition, a first sealing groove 10 is provided on the outer wall of the sealing shaft 3, a first sealing ring 11 is installed in the first sealing groove 10, and the first sealing ring 11 is used to contact with the inner wall of the floating sealing chamber 2 to achieve sealing. At the same time, a second sealing groove 15 is provided on the outer wall of the sealing ring 14 and close to one end of the floating sealing chamber 2, and a second sealing ring 16 is installed on the second sealing groove 15. When the sealing seat 4 is sleeved on the outer circle of the floating sealing chamber 2, the second sealing ring 16 abuts against the outer wall of the floating sealing chamber 2 to achieve sealing;

[0040] At the same time, in order to improve the sealing performance of the sealing seat 4 to the port of the floating sealing chamber 2, the outer wall of the sealing ring 14 is set to be sloped, and the height decreases from the direction away from the substrate 12, so that when the sealing seat 4 is clamped by the sealing cover 5, the sealing ring 14 moves inwards to gradually increase the contact area between the sealing ring 14 and the second sealing ring 16, so that the expansion area of ​​the second sealing ring 14 is increased, thereby increasing the sealing area;

[0041] At the same time, a T-shaped clamp 7 is welded on the other end of the connecting shaft 8 located at the sealing shaft 3, and a locking pad 6 is clamped on the T-shaped clamp 7. The diameter of the locking pad 6 is larger than the diameter of the other end of the floating sealing chamber 2. The locking pad 6 is provided with a U-shaped bayonet 21 that cooperates with the T-shaped clamp 7. During the inspection, the locking pad 6 is first clamped to the T-shaped clamp 7 through the U-shaped bayonet 21, and then the sealing shaft 3 is inserted into the floating sealing chamber 2, and then the sealing seat 4 is sleeved on the outer circle of the floating sealing chamber 2, and the screw 18 on the sealing cover 5 cooperates with the threaded hole 9 to gradually reduce the distance between the sealing cover 5 and the locking pad 6, so that the two are tightly attached to the two ends of the floating sealing chamber 2 to achieve sealing;

[0042] Therefore, through the above description, the utility model arranges the sealing shaft 3, the sealing seat 4, the sealing cover 5 and the locking gasket 6, the number of components used in the whole detection device is small, and the operation steps during assembly are simple and easy to learn. Under the premise of ensuring the detection quality, the detection efficiency is greatly improved.

[0043] At the same time, in order to improve the sealing performance between the sealing cover 5 and the side wall of the substrate 12, a third sealing ring 22 is installed on the sealing cover 5 inside the cover plate 17. The third sealing ring 22 increases the sealing performance between the cover plate 17 and the substrate 12, thereby preventing pressure from escaping from between the cover plate 17 and the substrate 12 and causing detection errors.

[0044] Please refer to the attached Figure 7-8 First, the locking gasket 6 is clamped to the T-shaped clamp 7 of the sealing shaft 3, and then the sealing shaft 3 with the locking gasket 6 installed is inserted into the floating sealing chamber 2 and one side of the locking gasket 6 is abutted against a port of the floating sealing chamber 2, and then the sealing seat 4 is mounted on the outer circle of the floating sealing chamber 2 through the sealing ring 14, and one side of the substrate 12 is abutted against the port of the floating sealing chamber 2, and then the screw 18 of the sealing cover 5 is passed through the connecting hole 13 and threadedly matched with the threaded hole 9 of the connecting shaft 8. As the sealing cover 5 rotates, the sealing seat 4 and the locking gasket 6 are gradually pulled closer by the screw 18, shortening the distance between the two and finally achieving the sealing of the floating sealing chamber 2, and then high-pressure air is introduced into the floating sealing chamber 2 through the air pump 19. When the pressure reaches the set pressure, the pressure is maintained. During the pressure maintenance process, the pressure change is observed by the pressure gauge 20 to analyze the air tightness in the floating sealing chamber 2.

[0045] The above description is only a preferred specific implementation method of the present utility model, and does not limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An air tightness detection device for a shaft seat, characterized in that: The invention comprises a sealing shaft (3), one end of which is provided with a sealing seat (4), a connection hole (13) being provided at the center of the sealing seat (4), a sealing cover (5) being provided on a side of the sealing seat (4) away from the sealing shaft (3), a screw rod (18) being provided on the sealing cover (5) at a position corresponding to the connection hole (13), the sealing cover (5) being threadedly connected to the sealing shaft (3) via the screw rod (18), a locking gasket (6) being provided on the other end of the sealing shaft (3), the locking gasket (6) and the sealing seat (4) being used to seal and plug the two sides of the floating seal chamber (2); The sealing seat (4) is also provided with an air-injection nozzle (19) for pressurizing the inside of the floating seal chamber (2) and a pressure gauge (20) for detecting the pressure of the floating seal chamber (2); A first sealing ring (11) is provided on the outer wall of the sealing shaft (3), and a second sealing ring (16) is provided on the sealing seat (4) located outside the floating sealing chamber (2).

2. The air tightness detection device for a shaft seat according to claim 1, characterized in that: A receiving hole is formed through the sealing shaft (3) near the screw rod (18), a connecting shaft (8) is welded and fixed in the receiving hole, and a threaded hole (9) is formed on the connecting shaft (8) at a concentric position of the screw rod (18), and the threaded hole (9) is threadedly matched with the screw rod (18).

3. The air tightness detection device for a shaft seat according to claim 2, characterized in that: One end of the connecting shaft (8) extends beyond the accommodating hole.

4. The air tightness detection device for a shaft seat according to claim 2, characterized in that: A T-shaped clamp (7) is welded to one end of the connecting shaft (8) located on the locking pad (6), and the T-shaped clamp (7) is used for clamping and matching with the locking pad (6).

5. The air tightness detection device for a shaft seat according to claim 1, characterized in that: The sealing seat (4) comprises a base plate (12), and a sealing ring (14) is provided on a side of the base plate (12) close to the sealing shaft (3), wherein the inner diameter of the sealing ring (14) is greater than the outer diameter of the floating sealing chamber (2).

6. The air tightness detection device for a shaft seat according to claim 5, characterized in that: The outer wall of the sealing ring (14) is sloped, and its height decreases in a direction away from the substrate (12).

7. The air tightness detection device for a shaft seat according to claim 1, characterized in that: A first sealing groove (10) is provided on the outer wall of the sealing shaft (3), and the first sealing ring (11) is installed in the first sealing groove (10).

8. The air tightness detection device for a shaft seat according to claim 5, characterized in that: A second sealing groove (15) is provided on the outer side of the sealing ring (14), and a second sealing ring (16) is installed in the second sealing groove (15).

9. The air tightness detection device for a shaft seat according to claim 1, characterized in that: The diameter of the locking gasket (6) is greater than the inner diameter of the floating seal chamber (2), and the diameter of the sealing seat (4) is greater than the outer diameter of the floating seal chamber (2).

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