阅读说明：本技术 一种油管车使用的防倾泄露的呼吸阀 (Anti-tipping leakage breather valve for oil pipe vehicle ) 是由 韩叶忠 徐顺和 诸悦 陈冲 王健 于 2020-07-03 设计创作，主要内容包括：本发明属于呼吸阀技术领域,尤其涉及一种油管车使用的防倾泄露的呼吸阀,它包括呼吸阀本体,本发明设计的呼吸阀,只有当油罐倾翻到大于20度时,配重块、安装杆和安装底座组成的结构才会倾倒,带动架体和密封板摆动,使得密封板上所开的第二气孔与密封盖上所开的第一气孔相互一一对应错位,使得安装套筒与呼吸阀本体之间的通道关闭,起到防泄漏的效果；而当油罐的倾角小于20度时,因安装底座大于配重块和安装杆在安装底座上的投影面积,所以配重块、安装杆和安装底座组成的结构不会倾倒。本发明考虑架体和安装杆复位不容易的情况,设计了复位机构,保证安装杆和架体方便的复位。(The invention belongs to the technical field of breather valves, and particularly relates to a breather valve capable of preventing leakage during tilting for an oil pipe vehicle, which comprises a breather valve body, wherein only when an oil tank is tilted to a temperature greater than 20 degrees, a structure consisting of a balancing weight, an installation rod and an installation base can be tilted to drive a frame body and a sealing plate to swing, so that a second air hole formed in the sealing plate and a first air hole formed in a sealing cover are correspondingly staggered one by one, a channel between an installation sleeve and the breather valve body is closed, and a leakage-proof effect is achieved; and when the inclination angle of the oil tank is less than 20 degrees, the installation base is larger than the projection area of the balancing weight and the installation rod on the installation base, so that the structure formed by the balancing weight, the installation rod and the installation base cannot topple over. According to the invention, the reset mechanism is designed in consideration of the condition that the reset of the frame body and the mounting rod is not easy, so that the mounting rod and the frame body are ensured to be conveniently reset.)

1. The utility model provides a breather valve that anti-tilt that oil pipe car used revealed, it includes the breather valve body, its characterized in that: also comprises an anti-leakage mechanism;

the anti-leakage mechanism comprises a resetting mechanism, an installation sleeve, a sealing plate, a telescopic rod, a frame body, a balancing weight, an installation rod, a fixed shell and an installation base, wherein the upper end and the lower end of the installation sleeve are respectively provided with a flange plate, the flange plate at the lower end is fixedly installed at an oil port of an oil tank through a bolt, and the flange plate at the upper end is fixedly connected with an inlet at the lower end of the breather valve body through a bolt; the inner circle surface of the upper end of the mounting sleeve is fixedly provided with a sealing cover, the sealing cover is provided with an inner sphere surface and an outer sphere surface, and the inner sphere surface and the outer sphere surface of the sealing cover are provided with first air holes which are uniformly distributed and run through; the lower end of the frame body is arranged in the mounting sleeve through a universal joint, and the upper end of the frame body is fixedly provided with a sealing plate; the sealing plate is positioned in the mounting sleeve and is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate is tightly attached to the inner spherical surface of the sealing cover; the inner spherical surface and the outer spherical surface of the sealing plate are provided with second air holes which are uniformly distributed and communicated, and the second air holes on the sealing plate and the first air holes on the sealing cover are correspondingly matched with each other;

the upper end of the fixed shell is an open end, and the lower end of the fixed shell is detachably arranged in the mounting sleeve through a support frame and is positioned at the lower end of the mounting sleeve; the lower end of the mounting rod is detachably provided with a mounting base, and the mounting base is placed in the fixed shell; the upper end of the mounting rod is fixedly provided with a balancing weight which is positioned at the upper side of the universal joint; the upper end of the telescopic rod is fixedly arranged on the inner spherical surface of the sealing plate, and the lower end of the telescopic rod is connected with the upper end of the balancing weight through a spherical hinge; the fixed shell is positioned at the lower side of the universal joint, and the mounting rod penetrates through the center of the universal joint; the resetting mechanism is arranged at the lower end of the mounting sleeve and plays a resetting role in the swinging of the mounting rod.

2. The anti-leakage breather valve for the oil pipe truck as claimed in claim 1, wherein: the outer circular surface of the lower end of the mounting sleeve is provided with a mounting hole, the mounting shell is fixedly mounted on the outer circular surface of the lower end of the mounting sleeve, a sliding groove is formed in the mounting shell, and the sliding groove is communicated with the mounting hole; a through trigger hole is formed between the sliding groove and the end face of the mounting shell, which is far away from one end of the mounting sleeve;

the reset mechanism comprises a reset plate, a first rack and a reset spring, wherein the reset plate is of an arc-shaped structure, two ends of the reset plate are provided with uniformly distributed crossed grooves, and the two reset plates are slidably arranged in the mounting sleeve; two ends of the two reset plates are in one-to-one correspondence and contact with each other, and the crossed grooves formed on the two reset plates are distributed in a staggered manner; one end of the first rack penetrates through a trigger hole and a sliding groove formed in the mounting shell and a mounting hole formed in the mounting sleeve to be slidably mounted on a shell formed by the mounting shell and the mounting sleeve; a return spring is arranged between the first rack and the inner end surface of the sliding groove formed on the mounting shell; the first rack slides to control the two reset plates to be mutually folded and unfolded through the transmission of the gear and the rack.

3. The anti-leakage breather valve for the oil pipe truck as claimed in claim 2, wherein: and a guide sleeve which plays a role in guiding and supporting the first rack sliding into the mounting sleeve is fixedly mounted on the inner circular surface at the lower end of the mounting sleeve.

4. The anti-leakage breather valve for the oil pipe truck as claimed in claim 2, wherein: the outer arc surfaces of the two reset plates are fixedly provided with first connecting plates, and one ends of the two first guide supports are symmetrically arranged on the inner circular surface of the mounting sleeve; two first connecting plates arranged on the two reset plates are slidably arranged on the two first guide supports in a one-to-one correspondence manner.

5. The anti-leakage breather valve for the oil pipe truck as claimed in claim 4, wherein: one ends of the two first connecting plates, which are far away from the corresponding reset plates, are fixedly provided with second connecting plates, one ends of the two third connecting plates are respectively and fixedly arranged on the two second connecting plates, and one ends of the two second racks are respectively and fixedly arranged at the other ends of the two third connecting plates; the two second racks are distributed in a staggered and parallel manner; the gear is rotatably arranged in the mounting sleeve and is respectively meshed with the two second racks; the first rack is meshed with the gear.

6. The anti-leakage breather valve for the oil pipe truck as claimed in claim 5, wherein: the fixed support is fixedly arranged in the mounting sleeve, one end of the fixed shaft is fixedly arranged on the fixed support, and the gear is rotatably arranged on the fixed shaft.

7. The anti-leakage breather valve for the oil pipe truck as claimed in claim 4, wherein: two second guide supports which play a role in guiding and supporting the two second racks are symmetrically arranged on the inner circular surface at the lower end of the mounting sleeve.

8. The anti-leakage breather valve for the oil pipe truck as claimed in claim 1, wherein: and a spring fixing plate is arranged on the first rack and is in sliding fit with the sliding groove formed in the mounting shell, one end of a return spring is fixedly arranged on the spring fixing plate, and the other end of the return spring is fixedly arranged on the inner end surface of the sliding groove.

9. The anti-leakage breather valve for the oil pipe truck as claimed in claim 2, wherein: the mounting shell is provided with a first lock hole communicated with the trigger hole, and the inner circular surface of the first lock hole is provided with an internal thread; a second lock hole is formed in one end, located on the outer side of the mounting shell and the mounting sleeve, of the first rack, an internal thread is formed in the inner circular surface of the second lock hole, and the second lock hole is matched with the first lock hole;

when the leakage-proof function of the leakage-proof mechanism is not needed, the first rack is pressed down, and then the first rack is fixed on the mounting shell through the locking bolt, the second locking hole formed in the first rack and the first locking hole formed in the mounting shell.

10. The anti-leakage breather valve for the oil pipe truck as claimed in claim 5, wherein: the gear is mounted on the fixed shaft through a bearing.

Technical Field

The invention belongs to the technical field of breather valves, and particularly relates to a breather valve capable of preventing leakage during tilting and used for an oil pipe vehicle.

Background

The breather valve consists of a pressure valve and a vacuum valve, is arranged on the air permeability pipe of the storage tank, and can be automatically opened and closed along with the change of positive pressure and negative pressure of oil gas in the storage tank, so that the pressure difference between the inside and the outside of the storage tank is kept within an allowable value range.

The breather valve is a safe and energy-saving product for maintaining the air pressure balance of the storage tank and reducing the volatilization of media, the breather valve fully utilizes the bearing capacity of the storage tank to reduce the discharge of the media, and the principle of the breather valve is to utilize the weight of a positive-negative pressure valve disc to control the positive exhaust pressure and the negative suction pressure of the storage tank. When the pressure of the medium in the tank is within the control operation pressure range of the breather valve, the breather valve does not work, and the airtightness of the oil tank is kept; when the medium is supplemented into the tank, the pressure of the upper gas space in the tank is raised, and the positive pressure of the operation of the breather valve is reached, the pressure valve is opened, and the gas escapes from the breather valve, so that the pressure in the tank is not increased any more; when the medium is pumped out of the tank, the pressure of the upper gas space in the tank is reduced, and the operation negative pressure of the breather valve is reached, the negative pressure valve disc of the top breather valve is pushed open by the atmosphere outside the tank, so that the external gas enters the tank, the pressure in the tank is not reduced any more, the pressure inside the tank is balanced with the pressure outside the tank, and the safety device of the storage tank is protected.

When the oil tank is dumped, the breather valve can leak due to the fact that the breather valve cannot bear oil pressure, and therefore the breather valve needs to be sealed; in the prior art, a copper semicircular weight is arranged at the bottom of a valve, and is positioned at the bottom of the valve under normal conditions; when the valve is tipped over, the weight turns over under the action of weight to seal the valve port; however, the technology is suitable for the situation that the tank is tilted over at a large angle, generally more than 30 degrees; for the risks of small-angle tipping in reality, such as when a fully loaded oil tank truck goes up and down a slope or the tipping angle of a side slope is more than 20 degrees and less than 30 degrees, and when the tipping angle of the oil tank which is static and filled with oil on the ground is more than 20 degrees and less than 30 degrees after the ground is collapsed, the existing anti-leakage technology cannot meet the anti-leakage requirement in the state, so that the design of the breather valve which can seal and prevent leakage in small-angle tipping is necessary. Storage tank

The invention designs an anti-leakage breather valve used for an oil pipe truck, which solves the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a respiratory valve for preventing the oil pipe vehicle from inclining and leaking, which is realized by adopting the following technical scheme.

The utility model provides a breather valve that anti-tilt that oil pipe car used revealed, it includes the breather valve body, its characterized in that: also included is an anti-leak mechanism.

The anti-leakage mechanism comprises a resetting mechanism, an installation sleeve, a sealing plate, a telescopic rod, a frame body, a balancing weight, an installation rod, a fixed shell and an installation base, wherein the upper end and the lower end of the installation sleeve are respectively provided with a flange plate, the flange plate at the lower end is fixedly installed at an oil port of an oil tank through a bolt, and the flange plate at the upper end is fixedly connected with an inlet at the lower end of the breather valve body through a bolt; the inner circle surface of the upper end of the mounting sleeve is fixedly provided with a sealing cover, the sealing cover is provided with an inner sphere surface and an outer sphere surface, and the inner sphere surface and the outer sphere surface of the sealing cover are provided with first air holes which are uniformly distributed and run through; the lower end of the frame body is arranged in the mounting sleeve through a universal joint, and the upper end of the frame body is fixedly provided with a sealing plate; the sealing plate is positioned in the mounting sleeve and is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate is tightly attached to the inner spherical surface of the sealing cover; the inner spherical surface and the outer spherical surface of the sealing plate are provided with second air holes which are uniformly distributed and communicated, and the second air holes formed in the sealing plate and the first air holes formed in the sealing cover are correspondingly matched with each other.

The upper end of the fixed shell is an open end, and the lower end of the fixed shell is detachably arranged in the mounting sleeve through a support frame and is positioned at the lower end of the mounting sleeve; the lower end of the mounting rod is detachably provided with a mounting base, and the mounting base is placed in the fixed shell; the upper end of the mounting rod is fixedly provided with a balancing weight which is positioned at the upper side of the universal joint; the upper end of the telescopic rod is fixedly arranged on the inner spherical surface of the sealing plate, and the lower end of the telescopic rod is connected with the upper end of the balancing weight through a spherical hinge; the fixed shell is positioned at the lower side of the universal joint, and the mounting rod penetrates through the center of the universal joint; the resetting mechanism is arranged at the lower end of the mounting sleeve and plays a resetting role in the swinging of the mounting rod.

As a further improvement of the technology, the outer circular surface of the lower end of the mounting sleeve is provided with a mounting hole, the mounting shell is fixedly mounted on the outer circular surface of the lower end of the mounting sleeve, a sliding groove is formed in the mounting shell, and the sliding groove is communicated with the mounting hole; and a through triggering hole is formed between the sliding groove and the end face of one end, far away from the mounting sleeve, of the mounting shell.

The reset mechanism comprises a reset plate, a first rack and a reset spring, wherein the reset plate is of an arc-shaped structure, two ends of the reset plate are provided with uniformly distributed crossed grooves, and the two reset plates are slidably arranged in the mounting sleeve; two ends of the two reset plates are in one-to-one correspondence and contact with each other, and the crossed grooves formed on the two reset plates are distributed in a staggered manner; one end of the first rack penetrates through a trigger hole and a sliding groove formed in the mounting shell and a mounting hole formed in the mounting sleeve to be slidably mounted on a shell formed by the mounting shell and the mounting sleeve; a return spring is arranged between the first rack and the inner end surface of the sliding groove formed on the mounting shell; the first rack slides to control the two reset plates to be mutually folded and unfolded through the transmission of the gear and the rack.

As a further improvement of the technology, a guide sleeve which plays a role in guiding and supporting the first rack sliding into the mounting sleeve is fixedly arranged on the inner circular surface of the lower end of the mounting sleeve.

As a further improvement of the technology, the outer cambered surfaces of the two reset plates are fixedly provided with first connecting plates, and one ends of the two first guide supports are symmetrically arranged on the inner circular surface of the mounting sleeve; two first connecting plates arranged on the two reset plates are slidably arranged on the two first guide supports in a one-to-one correspondence manner.

As a further improvement of the technology, one ends of the two first connecting plates, which are far away from the corresponding reset plates, are fixedly provided with second connecting plates, one ends of the two third connecting plates are respectively and fixedly arranged on the two second connecting plates, and one ends of the two second racks are respectively and fixedly arranged at the other ends of the two third connecting plates; the two second racks are distributed in a staggered and parallel manner; the gear is rotatably arranged in the mounting sleeve and is respectively meshed with the two second racks; the first rack is meshed with the gear.

As a further improvement of the technology, a fixed support is fixedly arranged in the mounting sleeve, one end of a fixed shaft is fixedly arranged on the fixed support, and a gear is rotatably arranged on the fixed shaft.

As a further improvement of the technology, two second guide supports which play a guide support role for the two second racks are symmetrically arranged on the inner circular surface of the lower end of the mounting sleeve.

As a further improvement of the present technology, a spring fixing plate is mounted on the first rack, the spring fixing plate is in sliding fit with the sliding groove formed in the mounting shell, one end of the return spring is fixedly mounted on the spring fixing plate, and the other end of the return spring is fixedly mounted on the inner end surface of the sliding groove.

As a further improvement of the technology, the mounting shell is provided with a first lock hole communicated with the trigger hole, and the inner circular surface of the first lock hole is provided with an internal thread; the first rack is located the installation shell and installs the sleeve outside one end and opens there is the second lockhole, has the internal thread on the interior disc of second lockhole, and second lockhole and first lockhole mutually support.

When the leakage-proof function of the leakage-proof mechanism is not needed, the first rack is pressed down, and then the first rack is fixed on the mounting shell through the locking bolt, the second locking hole formed in the first rack and the first locking hole formed in the mounting shell.

As a further improvement of the present technique, the gear is mounted on the fixed shaft through a bearing.

Compared with the traditional breather valve technology, the breather valve has the following beneficial effects:

1. according to the breather valve designed by the invention, only when the oil tank is tilted to a temperature greater than 20 degrees, the structure consisting of the balancing weight, the mounting rod and the mounting base can be tilted to drive the frame body and the sealing plate to swing, so that the second air holes formed in the sealing plate and the first air holes formed in the sealing cover are correspondingly staggered one by one, the channel between the mounting sleeve and the breather valve body is closed, and a leakage-proof effect is achieved; and when the inclination angle of the oil tank is less than 20 degrees, the installation base is larger than the projection area of the balancing weight and the installation rod on the installation base, so that the structure formed by the balancing weight, the installation rod and the installation base cannot topple over.

2. According to the breather valve designed by the invention, when the anti-leakage mechanism is not needed, the rack is pressed down, and then the first rack is fixed on the mounting shell through the locking bolt, the second lock hole formed in the rack and the first lock hole formed in the mounting shell; in this case, the leakage preventing mechanism corresponds to a through pipe installed between the oil tank and the breather valve body.

3. According to the invention, the reset mechanism is designed in consideration of the condition that the reset of the frame body and the mounting rod is not easy, so that the mounting rod and the frame body are ensured to be conveniently reset.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is an external view of the leakage preventing mechanism.

Fig. 3 is a schematic structural view of the leakage preventing mechanism.

Fig. 4 is a schematic view of the reset mechanism installation.

Fig. 5 is a schematic view of the mounting sleeve structure.

Fig. 6 is a schematic view of the first rack mounting.

Fig. 7 is a schematic view of the reset mechanism and the leak prevention mechanism in cooperation.

Fig. 8 is a schematic structural view of the return mechanism.

Fig. 9 is a gear installation schematic.

Fig. 10 is a schematic structural view of the return mechanism.

Number designation in the figures: 1. a breather valve body; 2. an anti-leakage mechanism; 3. a reset mechanism; 4. mounting a barrel sleeve; 5. a telescopic rod; 6. a frame body; 7. a balancing weight; 8. mounting a rod; 9. a stationary case; 10. a sealing cover; 11. a first air hole; 12. a guide sleeve; 13. mounting a shell; 14. mounting holes; 15. a sliding groove; 16. a trigger hole; 17. a first rack; 18. a gear; 20. a return spring; 21. a second air hole; 22. a sealing plate; 23. a universal joint; 24. a reset plate; 25. a first connecting plate; 26. a first guide support; 27. a second connecting plate; 28. a second rack; 29. a second guide support; 30. fixing and supporting; 31. a spring mounting plate; 32. a second lock hole; 33. a cross slot; 34. a fixed shaft; 35. a third connecting plate; 36. a support frame; 37. installing a base; 38. spherical hinge; 39. a first lock hole; 40. and (4) bolts.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, it comprises a breather valve body 1, characterized in that: also included is an anti-leak mechanism 2. The structure and the function of the breather valve body 1 designed by the invention are completely the same as those of the existing breather valve; the pressure difference between the inside and the outside of the storage tank is kept within an allowable value range.

As shown in fig. 2 and 3, the leakage-proof mechanism 2 includes a reset mechanism 3, an installation sleeve 4, a sealing plate 22, an expansion link 5, a frame body 6, a counterweight 7, an installation rod 8, a fixed shell 9, and an installation base 37, wherein as shown in fig. 5, the upper and lower ends of the installation sleeve are respectively provided with a flange, the flange at the lower end is fixedly installed at an oil port of an oil tank through a bolt 40, and the flange at the upper end is fixedly connected with an inlet at the lower end of the breather valve body 1 through a bolt 40; according to the invention, the sealing gaskets are sleeved at the joints of the flange plates to seal the channels among the oil tank, the leakage-proof mechanism and the breather valve; a sealing cover 10 is fixedly arranged on the inner circular surface at the upper end of the mounting sleeve, the sealing cover 10 is provided with an inner spherical surface and an outer spherical surface, and the inner spherical surface and the outer spherical surface of the sealing cover 10 are provided with first air holes 11 which are uniformly distributed and run through; as shown in fig. 3 and 7, the lower end of the frame body 6 is mounted in the mounting sleeve through a universal joint 23, and as shown in fig. 10, the upper end of the frame body 6 is fixedly mounted with a sealing plate 22; the sealing plate 22 is positioned in the mounting sleeve, the sealing plate 22 is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate 22 is tightly attached to the inner spherical surface of the sealing cover 10; the inner and outer spherical surfaces of the sealing plate 22 are provided with second air holes 21 which are uniformly distributed and run through, and the second air holes 21 formed on the sealing plate 22 are correspondingly matched with the first air holes 11 formed on the sealing cover 10; under the normal non-tipping state, the outer spherical surface of the sealing plate 22 is tightly attached to the inner spherical surface of the sealing cover 10, and the second air hole 21 formed in the sealing plate 22 and the first air hole 11 formed in the sealing cover 10 are correspondingly communicated with each other, so that the mounting sleeve and the breather valve body 1 are in a mutually communicated state, the gas in the oil tank is communicated with the breather valve body 1, the state is the same as the state that the normal breather valve is mounted on the oil tank, and only a section of through pipeline is added between the breather valve and the oil tank; in the invention, only when the oil tank is tilted to a temperature greater than 20 ℃, the structure consisting of the balancing weight 7, the mounting rod 8 and the mounting base 37 can be tilted to drive the frame body 6 and the sealing plate 22 to swing, so that the second air holes 21 formed in the sealing plate 22 and the first air holes 11 formed in the sealing cover 10 are correspondingly staggered one by one, the channel between the mounting sleeve and the breather valve body 1 is closed, and the leakage-proof effect is achieved; when the inclination angle of the oil tank is less than 20 degrees, the mounting base 37 is larger than the projection area of the counterweight 7 and the mounting rod 8 on the mounting base 37, so that the structure formed by the counterweight 7, the mounting rod 8 and the mounting base 37 cannot topple.

As shown in fig. 10, the upper end of the fixed casing 9 is an open end, and the lower end of the fixed casing 9 is detachably mounted in the mounting sleeve through a support bracket 36 and is located at the lower end of the mounting sleeve; the lower end of the mounting rod 8 is detachably provided with a mounting base 37, as shown in fig. 3, the mounting base 37 is placed in the fixed shell 9; the upper end of the mounting rod 8 is fixedly provided with a balancing weight 7, and the balancing weight 7 is positioned on the upper side of the universal joint 23; the upper end of the telescopic rod 5 is fixedly arranged on the inner spherical surface of the sealing plate 22, and the lower end of the telescopic rod 5 is connected with the upper end of the counterweight 7 through a spherical hinge 38; the fixed shell 9 is positioned at the lower side of the universal joint 23, and the mounting rod 8 penetrates through the center of the universal joint 23; as shown in fig. 4 and 6, the reset mechanism 3 is mounted at the lower end of the mounting sleeve, and the reset mechanism 3 plays a reset role in the swinging of the mounting rod 8. In the invention, because the center of the universal joint 23 and the hinge point of the spherical hinge 38 are not at the same position, the center of the installation rod 8 driving the sealing plate 22 to swing and the center of the frame body 6 driving the sealing plate 22 to swing are not at the same position, and in order to prevent interference, the spherical hinge 38 and the sealing plate 22 are connected through the telescopic rod 5, and the interference is prevented through the expansion and contraction of the telescopic rod 5.

The universal joint 23 designed by the invention has the functions of supporting the frame body 6 and the sealing plate 22 on one hand, and ensuring that the sealing plate 22 and the sealing cover 10 are tightly attached through the universal joint 23 on the other hand, so that the second air hole 21 formed in the sealing plate 22 is matched with the first air hole 11 formed in the sealing cover 10.

The lower end of a fixed shell 9 is detachably arranged in a mounting sleeve through a support frame 36 and is positioned at the lower end of the mounting sleeve; the lower end of the mounting rod 8 is detachably provided with a mounting base 37, and the lower end of the mounting rod 8 is mounted in the fixed shell 9 through the mounting base 37; the reason for the detachable installation is that the installation chassis and the fixed shell 9 with different sizes are selected and replaced according to the state of the road surface on which the oil tank truck frequently runs or the actual state of the storage area of the oil tank truck, so that the requirements of the oil tank on different tipping angles are met.

As shown in fig. 6, a mounting hole 14 is formed on the outer circumferential surface of the lower end of the mounting sleeve, a mounting shell 13 is fixedly mounted on the outer circumferential surface of the lower end of the mounting sleeve, a sliding groove 15 is formed in the mounting shell 13, and the sliding groove 15 is communicated with the mounting hole 14; a through triggering hole 16 is arranged between the sliding groove 15 and the end face of the mounting shell 13 far away from the mounting sleeve.

As shown in fig. 6 and 8, the reset mechanism 3 includes a reset plate 24, a first rack 17, and a reset spring 20, wherein the reset plate 24 is an arc-shaped structure, two ends of the reset plate 24 are provided with uniformly distributed crossed grooves 33, and the two reset plates 24 are slidably mounted in the mounting sleeve; two ends of the two reset plates 24 are in one-to-one correspondence and contact with each other, and the crossed grooves 33 formed on the two reset plates 24 are distributed in a staggered manner; one end of the first rack 17 passes through a trigger hole 16 formed on the mounting shell 13, a sliding groove 15 and a mounting hole 14 formed on the mounting sleeve and is slidably mounted on the mounting shell 13 and a shell formed by the mounting sleeve; a return spring 20 is arranged between the first rack 17 and the inner end surface of the sliding groove 15 formed on the mounting shell 13; the sliding of the first rack 17 controls the two reset plates 24 to be closed and opened mutually through the transmission of the gear 18 and the rack.

As shown in fig. 6, a guide sleeve 12 for guiding and supporting the first rack 17 sliding into the mounting sleeve is fixedly mounted on the inner circumferential surface of the lower end of the mounting sleeve.

As shown in fig. 8 and 9, the outer arc surfaces of the two reset plates 24 are fixedly provided with first connecting plates 25, and one ends of the two first guide supports 26 are symmetrically arranged on the inner circular surface of the mounting sleeve; the two first link plates 25 mounted on the two returning plates 24 are slidably mounted on the two first guide supports 26 in a one-to-one correspondence.

As shown in fig. 8, the ends of the two first connecting plates 25 away from the corresponding reset plate 24 are fixedly provided with second connecting plates 27, one ends of the two third connecting plates 35 are respectively fixedly provided on the two second connecting plates 27, and one ends of the two second racks 28 are respectively fixedly provided on the other ends of the two third connecting plates 35; the two second racks 28 are distributed in parallel in a staggered way; the gear 18 is rotatably mounted in the mounting sleeve, and the gear 18 is respectively meshed with the two second racks 28; the first rack 17 is engaged with the gear 18. The two racks and the gear 18 are matched to ensure the sliding synchronism of the two reset plates 24.

As shown in fig. 9, the fixed support 30 is fixedly mounted in the mounting sleeve, one end of the fixed shaft 34 is fixedly mounted on the fixed support 30, and the gear 18 is rotatably mounted on the fixed shaft 34.

As shown in fig. 4, 6 and 8, two second guide supports 29 for guiding and supporting the two second racks 28 are symmetrically mounted on the inner circumferential surface of the lower end of the mounting sleeve.

As shown in fig. 9, a spring fixing plate is mounted on the first rack 17, the spring fixing plate is slidably engaged with the sliding groove 15 formed in the mounting housing 13, one end of the return spring 20 is fixedly mounted on the spring fixing plate, and the other end of the return spring 20 is fixedly mounted on the inner end surface of the sliding groove 15.

As shown in fig. 6, the mounting shell 13 is provided with a first locking hole 39 communicated with the triggering hole 16, and an inner circular surface of the first locking hole 39 is provided with an internal thread; as shown in fig. 8, the first rack 17 has a second locking hole 32 at one end thereof located outside the mounting case 13 and the mounting sleeve, the second locking hole 32 has an internal thread on an inner circumferential surface thereof, and the second locking hole 32 and the first locking hole 39 are engaged with each other.

When the leakage preventing function of the leakage preventing mechanism 2 is not required, the first rack 17 is pressed down, and then the first rack 17 is fixed to the mounting case 13 through the locking bolt 40, the second locking hole 32 formed in the first rack 17, and the first locking hole 39 formed in the mounting case 13.

After the first rack 17 is pressed down, the two reset plates 24 are drawn together through the transmission of the gear 18, the second rack 28, the third connecting plate 35, the second connecting plate 27 and the third connecting plate 35, so that the mounting rod 8 is vertically locked, namely the sealing plate 22 and the sealing cover 10 are locked with each other, and the second air holes 21 formed in the sealing plate 22 and the first air holes 11 formed in the sealing cover 10 are aligned one by one; in this case, the leakage preventing mechanism corresponds to a through pipe installed between the oil tank and the breather valve body 1.

The gear 18 is mounted on a fixed shaft 34 by means of bearings.

The specific working process is as follows: when the breather valve designed by the invention is applied, when the oil tank is tipped over, the gravity center of the balancing weight 7 shifts, when the tipping angle of the oil tank is less than 20 degrees, the gravity center of the balancing weight 7 does not shift enough to enable the balancing weight 7 to drive the installation base 37 to turn over relative to the fixed shell 9 through the installation rod 8 under the action of the self weight, and the bottom surface of the installation base 37 is always in a contact state with the bottom surface in the fixed shell 9; the tipping angle is not enough to ensure that the breather valve cannot bear the oil pressure in the oil tank to cause leakage or the oil poured into the oil tank by the oil tank cannot flood the breather valve; when the oil tank is tilted to a position larger than 20 degrees, the gravity center offset angle of the balancing weight 7 is enough to enable the balancing weight 7 to drive the mounting base 37 to turn laterally relative to the fixed shell 9 through the mounting rod 8 under the action of the self weight of the balancing weight 7 by taking the outer circular surface on one side of the mounting base 37 as a fulcrum, the bottom surface of the mounting base 37 is separated from the bottom surface in the fixed shell 9, at the moment, the balancing weight 7 swings to drive the telescopic rod 5 to swing through the spherical hinge 38, the telescopic rod 5 swings to drive the sealing plate 22 to swing relative to the mounting sleeve, and namely, the. The frame body 6 and the sealing plate 22 of the invention also have the tendency of toppling in the toppling process of the oil tank, but whether the toppling is mainly influenced by the counterweight 7 and the mounting rod 8, so the weight of the counterweight 7 is heavier than that of the related structure.

When the anti-leakage mechanism is triggered and the mounting rod 8 and the frame body 6 are reset after being tilted, firstly, the first rack 17 is manually pressed down, so that the first rack 17 slides towards the inner side of the mounting sleeve, the first rack 17 slides to drive the gear 18 to rotate, the gear 18 rotates to drive the two second racks 28 to slide, the two second racks 28 slide to drive the two third connecting plates 35 to slide, the two third connecting plates 35 slide to drive the two second connecting plates 27 to slide, the two second connecting plates 27 slide to drive the two first connecting plates 25 to slide, the two first connecting plates 25 slide to drive the two reset plates 24 to slide and approach each other, and when the two reset plates 24 slide and approach each other, the crossed grooves 33 formed on the two reset plates 24 are crossed; in-process that draws close each other at two reset plates 24, after two reset plates 24 and installation pole 8 contact, two reset plates 24 will extrude installation pole 8 and make installation pole 8 vertical centering gradually, reset to initial state, the in-process that installation pole 8 resets can drive balancing weight 7, installation base 37, support body 6 and closing plate 22 reset, finally make the bottom surface in installation base 37 and the bottom surface in the set casing 9 in close contact with, 7 vertical distributions of balancing weight, 11 one-to-one alignments in the first gas pocket of opening on second gas pocket 21 and the sealed lid 10 of opening on the closing plate 22.

When the first rack 17 is released, the first rack 17 slides towards the outside of the mounting sleeve under the action of the return spring 20, and the two return plates 24 are separated again by the transmission of the gear 18, the second rack 28, the third connecting plate 35, the second connecting plate 27 and the third connecting plate 35.