阅读说明：本技术 一种具有外泄漏防务功能的液压阻尼器 (Hydraulic damper with external leakage service prevention function ) 是由 钱雪松 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种具有外泄漏防务功能的液压阻尼器,包括右销头、右端盖、外缸筒、辅油箱右活塞、内缸筒、阻尼器活塞、阻尼器活塞杆、辅油箱左活塞、左端盖、左销头、辅油箱活塞复位弹簧和中间缸筒。本发明通过创新的结构设计,在液压阻尼器的活塞杆和端盖之间设置双层密封装置,在两层密封装置之间开设泄漏油槽,通过相关油路引出进入低压辅油箱内,大大降低液压阻尼器的外泄漏风险,保证液压阻尼器可靠工作,具有广泛的应用前景。(The invention discloses a hydraulic damper with an external leakage service-preventing function, which comprises a right pin head, a right end cover, an outer cylinder barrel, an auxiliary oil tank right piston, an inner cylinder barrel, a damper piston rod, an auxiliary oil tank left piston, a left end cover, a left pin head, an auxiliary oil tank piston return spring and a middle cylinder barrel. According to the invention, through an innovative structural design, the double-layer sealing device is arranged between the piston rod and the end cover of the hydraulic damper, the oil leakage groove is formed between the two layers of sealing devices, and the oil leakage groove is led out into the low-pressure auxiliary oil tank through a related oil way, so that the external leakage risk of the hydraulic damper is greatly reduced, the reliable work of the hydraulic damper is ensured, and the hydraulic damper has a wide application prospect.)

1. The utility model provides a hydraulic damper with external leakage service prevention function which characterized in that: the hydraulic cylinder comprises a right pin head (1), a right end cover (2), an outer cylinder barrel (3), an auxiliary oil tank right piston (4), an inner cylinder barrel (5), a damper piston (6), a damper piston rod (7), an auxiliary oil tank left piston (8), a left end cover (9), a left pin head (10), an auxiliary oil tank piston return spring (11) and a middle cylinder barrel (12);

a right end cover first step (2-5), a right end cover second step (2-6) and a right end cover third step (2-7) are sequentially processed on the outer circumferential wall of the right end cover (2) from left to right, and a right end cover first oil through hole (2-3) is radially processed at the upper part of the right end cover third step (2-7); a right end cover second oil through hole (2-4) is axially processed on the right side end face of the right end cover first step (2-5), and the right end of the right end cover second oil through hole (2-4) is communicated with the right end cover first oil through hole (2-3); a right end cover damping hole (2-2) is formed in the upper side of the left portion of the right end cover (2), the left end of the right end cover damping hole (2-2) penetrates through the left end face of the right end cover (2), and the right end of the right end cover damping hole (2-2) is communicated with a first right end cover oil through hole (2-3); a right end cover normally-open one-way valve (2-1) is installed on the lower side of the left part of the right end cover (2), an outlet of the right end cover normally-open one-way valve (2-1) is communicated to the left end face of the right end cover (2), and an inlet of the right end cover normally-open one-way valve (2-1) is communicated with a first oil through hole (2-3) of the right end cover; an auxiliary oil tank right piston right side inner annular groove (4-1) is machined on the inner side of the right end of the auxiliary oil tank right piston (4), an auxiliary oil tank right piston left side annular groove (4-2) is machined on the inner side of the left end of the auxiliary oil tank right piston (4), sealing ring grooves are machined on the inner side and the outer side of the middle part of the auxiliary oil tank right piston (4), and an auxiliary oil tank right piston inner sealing ring and an auxiliary oil tank outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; steps are processed at the left end and the right end of the damper piston (6), a first damper piston oil through hole (6-1) which is radially communicated is processed on the left step of the damper piston (6), a second damper piston oil through hole (6-4) which is radially communicated is processed on the right step of the damper piston (6), a first damper piston normally-open one-way valve (6-2) and a second damper piston normally-open one-way valve (6-3) are installed inside the damper piston (6), an outlet of the first damper piston normally-open one-way valve (6-2) is communicated with the first damper piston oil through hole (6-1), an outlet of the second damper piston normally-open one-way valve (6-3) is communicated with the second damper piston oil through hole (6-4), and an inlet of the first damper piston normally-open one-way valve (6-2) is communicated with an inlet of the second damper piston normally-open one-way valve (6-3) Are communicated with each other; a damper piston damping hole (6-5) is formed in the damper piston (6), the left end of the damper piston damping hole (6-5) is communicated with a damper piston first oil through hole (6-1), and the right end of the damper piston damping hole (6-5) is communicated with a damper piston second oil through hole (6-4); an auxiliary oil tank left piston left side inner annular groove (8-1) is processed on the inner side of the left end of the auxiliary oil tank left piston (8), an auxiliary oil tank left piston right side annular groove (8-2) is processed on the inner side of the right end of the auxiliary oil tank left piston (8), sealing ring grooves are processed on the inner side and the outer side of the middle part of the auxiliary oil tank left piston (8), and an auxiliary oil tank left piston inner sealing ring and an auxiliary oil tank outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; a left end cover annular oil groove (9-1) is machined in the middle of an inner hole of the left end cover (9), a left end cover first step (9-4), a left end cover second step (9-5) and a left end cover third step (9-6) are sequentially machined on the outer circumferential wall of the left end cover (9) from right to left, a left end cover first oil through hole (9-2) is radially machined in the upper portion of the left end cover third step (9-6), and the left end cover first oil through hole (9-2) is communicated with the left end cover annular oil groove (9-1); a left end cover second oil through hole (9-3) is axially machined in the left end face of the left end cover first step (9-4), and the left end of the left end cover second oil through hole (9-3) is communicated with the left end cover first oil through hole (9-2); the right pin head (1) and the right end cover (2) are reliably connected into a whole; the right end of the inner cylinder barrel (5) is sleeved on the first step (2-5) of the right end cover, and reliable sealing is formed between the inner hole of the right end of the inner cylinder barrel (5) and the first step (2-5) of the right end cover; the damper piston (6) and the damper piston rod (7) form reliable connection and sealing; the damper piston (6) and the damper piston rod (7) are inserted into the inner cylinder (5), and reliable sealing and guiding are formed between the damper piston (6) and the inner cylinder (5); the right end of the middle cylinder barrel (12) is sleeved on a second step (2-6) of the right end cover; the auxiliary oil tank right piston (4), the auxiliary oil tank piston return spring (11) and the auxiliary oil tank left piston (8) are sequentially sleeved on the outer cylindrical wall of the middle cylinder barrel (12) from left to right, the left end of the auxiliary oil tank piston return spring (11) is installed into the auxiliary oil tank left piston right annular groove (8-2), the right end of the auxiliary oil tank piston return spring (11) is installed into the auxiliary oil tank right piston left annular groove (4-2), the left end and the right end of the auxiliary oil tank piston return spring (11) respectively abut against the auxiliary oil tank left piston (8) and the auxiliary oil tank right piston (4), and reliable sealing is formed between the auxiliary oil tank right piston (4), the auxiliary oil tank left piston (8) and the outer cylindrical wall of the middle cylinder barrel (12); the outer cylinder barrel (3) is sequentially sleeved on the maximum outer cylinder on the right sides of the auxiliary oil tank left piston (8), the auxiliary oil tank right piston (4) and the right end cover (2) from left to right, and reliable sealing is formed between the inner hole of the outer cylinder barrel (3) and the outer walls of the auxiliary oil tank left piston (8) and the auxiliary oil tank right piston (4) respectively; the right end of the outer cylinder barrel (3) is reliably connected and sealed with the right end cover (2); the left end cover (9) is sleeved on the damper piston rod (7), the first step (9-4) of the left end cover is inserted into the left end of the inner cylinder barrel (5), the second step (9-5) of the left end cover is inserted into the left end of the middle cylinder barrel (12), and meanwhile, the outermost circumference of the left end cover (9) is inserted into the left end of the outer cylinder barrel (3); the left end cover (9) and the left end of the outer cylinder barrel (3) form reliable connection and sealing; a reliable seal is formed between the first step (9-4) of the left end cover and the left end of the inner cylinder barrel (5); a dustproof device and a sealing device are respectively arranged on the left side of the annular oil groove (9-1) of the left end cover between the left end cover (9) and the damper piston rod (7), and reliable dustproof and sealing are formed between the left end cover (9) and the damper piston rod (7); a sealing device and a guiding device are respectively arranged on the right side of the annular oil groove (9-1) of the left end cover between the left end cover (9) and the damper piston rod (7), and reliable sealing and guiding are formed between the left end cover (9) and the damper piston rod (7); the left pin head (10) is reliably connected with the left end of the damper piston rod (7); the right inner annular groove (4-1) of the right piston of the auxiliary oil tank is communicated with the first oil through hole (2-3) of the right end cover; the left inner annular groove (8-1) of the left piston of the auxiliary oil tank is communicated with the first oil through hole (9-2) of the left end cover; a damper left working cavity A is formed between the left side of the damper piston (6) and the left end cover (9), a damper left working cavity B is formed between the right side of the damper piston (6) and the right end cover (2), and a return spring cavity C is formed between the auxiliary oil tank left piston (8) and the auxiliary oil tank right piston (4); an auxiliary oil tank left oil chamber D is formed between the left end cover (9) and the auxiliary oil tank left piston (8); an auxiliary oil tank right oil chamber E is formed between the right end cover (2) and the auxiliary oil tank right piston (4); an annular oil passage F is formed between the inner wall of the middle cylinder barrel (12) and the outer wall of the inner cylinder barrel (5); the left end cover annular oil groove (9-1), the left end cover first oil through hole (9-2), the left end cover second oil through hole (9-3), the auxiliary oil tank left oil chamber D, the annular oil through way F, the auxiliary oil tank right oil chamber E, the right end cover second oil through hole (2-4) and the right end cover first oil through hole (2-3) are communicated with each other; the hydraulic damper working oil is filled in the damper left working cavity A, the damper left working cavity B, the auxiliary oil tank left oil chamber D, the auxiliary oil tank right oil chamber E, the annular oil passage F and the communicated oil through holes and oil grooves through oil filling ports; and working oil in the annular oil groove (9-1) of the left end cover is in a low-pressure state.

2. The hydraulic damper with external leakage service prevention function according to claim 1, characterized in that: and working oil in the auxiliary oil tank left oil chamber D and the auxiliary oil tank right oil chamber E is in a low-pressure state.

Technical Field

The invention relates to a hydraulic damper, in particular to a hydraulic damper with an external leakage service-proof function, and belongs to the fields of machinery, hydraulic pressure, damping buffering, shock resistance and the like.

Background

At present, the hydraulic damper is widely applied to the field of anti-seismic and shock absorption. In the application process of the hydraulic damper, the oil leakage condition of the hydraulic damper often occurs, once the oil leakage occurs to the hydraulic damper, on one hand, the environment can be polluted, on the other hand, the hydraulic damper can lose the damping function and cannot work normally. The leakage form of the hydraulic damper comprises an inner leakage form and an outer leakage form, particularly, the outer leakage needs to be strictly controlled, in some special occasions, the outer leakage of the hydraulic damper is strictly forbidden, and the outer leakage of a hydraulic oil cylinder is commonly existed in dynamic sealing occasions, such as between a piston rod and an end cover of the hydraulic damper.

Disclosure of Invention

In order to effectively solve the problem of external leakage of the hydraulic damper, the invention provides the hydraulic damper with the function of external leakage prevention.

The technical scheme of the invention is as follows:

a hydraulic damper with an external leakage service-prevention function comprises a right pin head, a right end cover, an outer cylinder barrel, an auxiliary oil tank right piston, an inner cylinder barrel, a damper piston rod, an auxiliary oil tank left piston, a left end cover, a left pin head, an auxiliary oil tank piston return spring and a middle cylinder barrel;

a right end cover first step, a right end cover second step and a right end cover third step are sequentially processed on the outer circumferential wall of the right end cover from left to right, and a right end cover first oil through hole is radially processed at the upper part of the right end cover third step; a right end cover second oil through hole is axially processed on the right side end face of the right end cover first step, and the right end of the right end cover second oil through hole is communicated with the right end cover first oil through hole; a right end cover damping hole is formed in the upper side of the left part of the right end cover, the left end of the right end cover damping hole penetrates through the left end face of the right end cover, and the right end of the right end cover damping hole is communicated with the right end cover first oil through hole; a right end cover normally open one-way valve is mounted on the lower side of the left part of the right end cover, an outlet of the right end cover normally open one-way valve is communicated to the left end face of the right end cover, and an inlet of the right end cover normally open one-way valve is communicated with the right end cover first oil through hole; an auxiliary oil tank right piston right inner ring groove is processed on the inner side of the right end of the auxiliary oil tank right piston, an auxiliary oil tank right piston left ring groove is processed on the inner side of the left end of the auxiliary oil tank right piston, sealing ring grooves are processed on the inner side and the outer side of the middle part of the auxiliary oil tank right piston, and an auxiliary oil tank right piston inner sealing ring and an auxiliary oil tank right piston outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; steps are processed at the left end and the right end of the damper piston, a first damper piston oil through hole which is radially communicated is processed on the left step of the damper piston, a second damper piston oil through hole which is radially communicated is processed on the right step of the damper piston, a first damper piston normally-open check valve and a second damper piston normally-open check valve are installed inside the damper piston, the outlet of the first damper piston normally-open check valve is communicated with the first damper piston oil through hole, the outlet of the second damper piston normally-open check valve is communicated with the second damper piston oil through hole, and the inlet of the first damper piston normally-open check valve is communicated with the inlet of the second damper piston normally-open check valve; a damper piston damping hole is formed in the damper piston, the left end of the damper piston damping hole is communicated with a first oil through hole of the damper piston, and the right end of the damper piston damping hole is communicated with a second oil through hole of the damper piston; an auxiliary oil tank left piston left inner ring groove is processed on the inner side of the left end of the auxiliary oil tank left piston, an auxiliary oil tank left piston right ring groove is processed on the inner side of the right end of the auxiliary oil tank left piston, sealing ring grooves are processed on the inner side and the outer side of the middle part of the auxiliary oil tank left piston, and an auxiliary oil tank left piston inner sealing ring and an auxiliary oil tank left piston outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; a left end cover annular oil groove is processed in the middle of an inner hole of the left end cover, a left end cover first step, a left end cover second step and a left end cover third step are sequentially processed on the outer circumferential wall of the left end cover from right to left, a left end cover first oil through hole is radially processed in the upper portion of the left end cover third step, and the left end cover first oil through hole is communicated with the left end cover annular oil groove; a left end cover second oil through hole is axially processed on the left end face of the left end cover first step, and the left end of the left end cover second oil through hole is communicated with the left end cover first oil through hole; the right pin head and the right end cover are reliably connected into a whole; the right end of the inner cylinder barrel is sleeved on the first step of the right end cover, and reliable sealing is formed between the right end inner hole of the inner cylinder barrel and the first step of the right end cover; the damper piston and the damper piston rod form reliable connection and sealing; the damper piston and the damper piston rod are inserted into the inner cylinder barrel, and reliable sealing and guiding are formed between the damper piston and the inner cylinder barrel; the right end of the middle cylinder barrel is sleeved on a second step of the right end cover; the auxiliary oil tank right piston, the auxiliary oil tank piston reset spring and the auxiliary oil tank left piston are sequentially sleeved on the outer cylindrical wall of the middle cylinder barrel from left to right, the left end of the auxiliary oil tank piston reset spring is installed into the right annular groove of the auxiliary oil tank left piston, the right end of the auxiliary oil tank piston reset spring is installed into the left annular groove of the auxiliary oil tank right piston, the left end and the right end of the auxiliary oil tank piston reset spring respectively abut against the auxiliary oil tank left piston and the auxiliary oil tank right piston, and reliable sealing is formed between the auxiliary oil tank right piston and the auxiliary oil tank left piston and the outer cylindrical wall of the middle cylinder barrel; the outer cylinder barrel is sequentially sleeved on the maximum outer cylinder on the right sides of the auxiliary oil tank left piston, the auxiliary oil tank right piston and the right end cover from left to right, and reliable sealing is formed between the inner hole of the outer cylinder barrel and the outer walls of the auxiliary oil tank left piston and the auxiliary oil tank right piston respectively; the right end of the outer cylinder barrel is reliably connected and sealed with the right end cover; the left end cover is sleeved on the damper piston rod, the first step of the left end cover is inserted into the left end of the inner cylinder barrel, the second step of the left end cover is inserted into the left end of the middle cylinder barrel, and meanwhile, the outermost circumference of the left end cover is inserted into the left end of the outer cylinder barrel; the left end cover and the left end of the outer cylinder barrel form reliable connection and sealing; a reliable seal is formed between the first step of the left end cover and the left end of the inner cylinder barrel; a dustproof device and a sealing device are respectively arranged on the left side of the annular oil groove of the left end cover between the left end cover and the damper piston rod, and reliable dustproof and sealing are formed between the left end cover and the damper piston rod; a sealing device and a guiding device are respectively arranged on the right side of the annular oil groove of the left end cover between the left end cover and the damper piston rod, and reliable sealing and guiding are formed between the left end cover and the damper piston rod; the left pin head is reliably connected with the left end of the damper piston rod; the right inner annular groove of the right piston of the auxiliary oil tank is communicated with the first oil through hole of the right end cover; the inner annular groove in the left side of the left piston of the auxiliary oil tank is communicated with the first oil through hole of the left end cover; a damper left working cavity A is formed between the left side of the damper piston and the left end cover, a damper left working cavity B is formed between the right side of the damper piston and the right end cover, and a return spring cavity C is formed between the auxiliary oil tank left piston and the auxiliary oil tank right piston; an auxiliary oil tank left oil chamber D is formed between the left end cover and the auxiliary oil tank left piston; an auxiliary oil tank right oil chamber E is formed between the right end cover and the auxiliary oil tank right piston; an annular oil passage F is formed between the inner wall of the middle cylinder barrel and the outer wall of the inner cylinder barrel; the left end cover annular oil groove, the left end cover first oil through hole, the left end cover second oil through hole, the auxiliary oil tank left oil chamber D, the annular oil through path F, the auxiliary oil tank right oil chamber E, the right end cover second oil through hole and the right end cover first oil through hole are communicated with each other; the hydraulic damper working oil is filled in the damper left working cavity A, the damper left working cavity B, the auxiliary oil tank left oil chamber D, the auxiliary oil tank right oil chamber E, the annular oil passage F and the communicated oil through holes and oil grooves through oil filling ports; and working oil in the annular oil groove of the left end cover is in a low-pressure state.

And the working oil in the auxiliary oil tank left oil chamber D and the auxiliary oil tank right oil chamber E is in a low-pressure state.

The working process is as follows:

when the damper piston rod drives the damper piston to move leftwards at a low speed, the first normally-open check valve of the damper piston and the second normally-open check valve of the damper piston are in a normally-open state. At the moment, on one hand, working oil in the left working cavity A of the damper can flow into the left working cavity B of the damper through the first damper piston oil through hole, the first damper piston normally-open check valve, the second damper piston normally-open check valve and the second damper piston oil through hole, on the other hand, working oil in the left working cavity A of the damper can also flow into the left working cavity B of the damper through the first damper piston oil through hole, the damper piston damping hole and the second damper piston oil through hole, and meanwhile, working oil in the right oil chamber E of the auxiliary oil tank can be supplemented into the left working cavity B of the damper through the first right end cover oil through the normally-open check valve of the right end cover and the damping hole of the right end cover respectively;

when the damper piston rod drives the damper piston to move rightwards at a low speed, the first normally-open check valve of the damper piston and the second normally-open check valve of the damper piston are in a normally-open state. At the moment, on one hand, the working oil in the left working cavity B of the damper can flow into the left working cavity A of the damper through the second oil through hole of the damper piston, the second normally open check valve of the damper piston, the first normally open check valve of the damper piston and the first oil through hole of the damper piston, and on the other hand, the working oil in the left working cavity B of the damper can also flow into the left working cavity A of the damper through the second oil through hole of the damper piston, the damping hole of the damper piston and the first oil through hole of the damper piston, and meanwhile, the working oil in the left working cavity B of the damper can flow into the right oil chamber E of the auxiliary oil tank through the normally open check valve of the right end cover and the damping hole of the right end cover respectively;

when the damper piston rod drives the damper piston to move leftwards rapidly, the first normally open check valve of the damper piston is in a locking state. At the moment, the working oil in the left working cavity A of the damper can only flow into the left working cavity B of the damper through the first oil through hole of the damper piston, the damping hole of the damper piston and the second oil through hole of the damper piston, and when the working oil flows through the damping hole of the damper piston, a damping effect is formed, so that a damping force is generated on the damper piston, and the working oil does work outwards, consumes external energy and plays a role in shock absorption and shock resistance; because the working oil in the annular oil groove of the left end cover is in a lower pressure state, the risk of leakage of the working oil is reduced, and the working reliability of the oil damper is improved;

when the damper piston rod drives the damper piston to move rightwards rapidly, the second normally-open check valve of the damper piston and the normally-open check valve of the right end cover are in a locking state. At the moment, on the one hand, the working oil in the left working cavity B of the damper can flow into the left working cavity A of the damper through the second oil through hole of the damper piston, the damping hole of the damper piston and the first oil through hole of the damper piston, on the other hand, the working oil in the left working cavity B of the damper can also flow into the right oil chamber E of the auxiliary oil tank through the damping hole of the right end cover, when the working oil flows through the damping hole of the damper piston and the damping hole of the right end cover, a damping effect is formed, damping force is generated on the damper piston, work is done outwards, external energy is consumed, and the shock absorption and shock resistance effects are achieved.

From the working process analysis of the hydraulic damper, the pressure of the working oil in the annular oil groove of the left end cover is in a lower state, and the sealing device on the left side of the annular oil groove of the left end cover between the left end cover of the hydraulic damper and the damper piston rod is always in a low-pressure working state, so that the risk of external leakage of the working oil is reduced, and the working reliability of the oil damper is improved.

The invention has the following beneficial effects:

according to the invention, the double-layer sealing device is arranged between the piston rod and the end cover of the hydraulic damper, the oil leakage groove is formed between the two layers of sealing devices, and the oil leakage groove is led out into the low-pressure auxiliary oil tank through the related oil way, so that the external leakage risk of the hydraulic damper is greatly reduced, and the reliable work of the hydraulic damper is ensured.

Drawings

The present invention will be described in further detail with reference to the following examples, which are given in the accompanying drawings.

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, a hydraulic damper with an external leakage service-proof function comprises a right pin head 1, a right end cover 2, an outer cylinder 3, an auxiliary oil tank right piston 4, an inner cylinder 5, a damper piston 6, a damper piston rod 7, an auxiliary oil tank left piston 8, a left end cover 9, a left pin head 10, an auxiliary oil tank piston return spring 11 and a middle cylinder 12;

a right end cover first step 2-5, a right end cover second step 2-6 and a right end cover third step 2-7 are sequentially processed on the outer circumferential wall of the right end cover 2 from left to right, and a right end cover first oil through hole 2-3 is radially processed at the upper part of the right end cover third step 2-7; a right end cover second oil through hole 2-4 is axially processed on the right side end face of the right end cover first step 2-5, and the right end of the right end cover second oil through hole 2-4 is communicated with the right end cover first oil through hole 2-3; a right end cover damping hole 2-2 is formed in the upper side of the left portion of the right end cover 2, the left end of the right end cover damping hole 2-2 penetrates through the left end face of the right end cover 2, and the right end of the right end cover damping hole 2-2 is communicated with a right end cover first oil through hole 2-3; a right end cover normally-open one-way valve 2-1 is installed on the lower side of the left part of the right end cover 2, an outlet of the right end cover normally-open one-way valve 2-1 is communicated to the left end face of the right end cover 2, and an inlet of the right end cover normally-open one-way valve 2-1 is communicated with a first oil through hole 2-3 of the right end cover; an auxiliary oil tank right piston right side inner ring groove 4-1 is processed on the inner side of the right end of the auxiliary oil tank right piston 4, an auxiliary oil tank right piston left side ring groove 4-2 is processed on the inner side of the left end of the auxiliary oil tank right piston 4, sealing ring grooves are processed on the inner side and the outer side of the middle part of the auxiliary oil tank right piston 4, and an auxiliary oil tank right piston inner sealing ring and an auxiliary oil tank outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; steps are respectively processed at the left end and the right end of the damper piston 6, a first damper piston oil through hole 6-1 which is radially communicated is processed on the left step of the damper piston 6, a second damper piston oil through hole 6-4 which is radially communicated is processed on the right step of the damper piston 6, a first damper piston normally-open one-way valve 6-2 and a second damper piston normally-open one-way valve 6-3 are arranged inside the damper piston 6, the outlet of the first damper piston normally-open one-way valve 6-2 is communicated with the first damper piston oil through hole 6-1, the outlet of the second damper piston normally-open one-way valve 6-3 is communicated with the second damper piston oil through hole 6-4, and the inlet of the first damper piston normally-open one-way valve 6-2 is communicated with the inlet of the second damper piston normally-open one-way valve 6-3; a damper piston damping hole 6-5 is formed in the damper piston 6, the left end of the damper piston damping hole 6-5 is communicated with a damper piston first oil through hole 6-1, and the right end of the damper piston damping hole 6-5 is communicated with a damper piston second oil through hole 6-4; an auxiliary oil tank left piston left side inner annular groove 8-1 is processed on the inner side of the left end of the auxiliary oil tank left piston 8, an auxiliary oil tank left piston right side annular groove 8-2 is processed on the inner side of the right end of the auxiliary oil tank left piston 8, sealing ring grooves are processed on the inner side and the outer side of the middle part of the auxiliary oil tank left piston 8, and an auxiliary oil tank left piston inner sealing ring and an auxiliary oil tank outer sealing ring are respectively installed in the inner sealing ring groove and the outer sealing ring groove; a left end cover annular oil groove 9-1 is machined in the middle of an inner hole of the left end cover 9, a left end cover first step 9-4, a left end cover second step 9-5 and a left end cover third step 9-6 are sequentially machined on the outer circumferential wall of the left end cover 9 from right to left, a left end cover first oil through hole 9-2 is radially machined in the upper portion of the left end cover third step 9-6, and the left end cover first oil through hole 9-2 is communicated with the left end cover annular oil groove 9-1; a left end cover second oil through hole 9-3 is axially machined in the left end face of the left end cover first step 9-4, and the left end of the left end cover second oil through hole 9-3 is communicated with the left end cover first oil through hole 9-2; the right pin head 1 and the right end cover 2 are reliably connected into a whole; the right end of the inner cylinder 5 is sleeved on the first step 2-5 of the right end cover, and reliable sealing is formed between the inner hole at the right end of the inner cylinder 5 and the first step 2-5 of the right end cover; a reliable connection and sealing is formed between the damper piston 6 and the damper piston rod 7; the damper piston 6 and the damper piston rod 7 are inserted into the inner cylinder 5, and reliable sealing and guiding are formed between the damper piston 6 and the inner cylinder 5; the right end of the middle cylinder barrel 12 is sleeved on the second step 2-6 of the right end cover; the auxiliary oil tank right piston 4, the auxiliary oil tank piston return spring 11 and the auxiliary oil tank left piston 8 are sequentially sleeved on the outer cylindrical wall of the middle cylinder barrel 12 from left to right, the left end of the auxiliary oil tank piston return spring 11 is installed into an auxiliary oil tank left piston right annular groove 8-2, the right end of the auxiliary oil tank piston return spring 11 is installed into an auxiliary oil tank right piston left annular groove 4-2, the left end and the right end of the auxiliary oil tank piston return spring 11 respectively abut against the auxiliary oil tank left piston 8 and the auxiliary oil tank right piston 4, and reliable sealing is formed between the auxiliary oil tank right piston 4 and the auxiliary oil tank left piston 8 and the outer cylindrical wall of the middle cylinder barrel 12; the outer cylinder barrel 3 is sequentially sleeved on the maximum outer cylinder on the right sides of the auxiliary oil tank left piston 8, the auxiliary oil tank right piston 4 and the right end cover 2 from left to right, and reliable sealing is formed between the inner hole of the outer cylinder barrel 3 and the outer walls of the auxiliary oil tank left piston 8 and the auxiliary oil tank right piston 4 respectively; the right end of the outer cylinder barrel 3 is reliably connected and sealed with the right end cover 2; the left end cover 9 is sleeved on the damper piston rod 7, the first step 9-4 of the left end cover is inserted into the left end of the inner cylinder 5, the second step 9-5 of the left end cover is inserted into the left end of the middle cylinder 12, and meanwhile, the outermost circumference of the left end cover 9 is inserted into the left end of the outer cylinder 3; the left end cover 9 and the left end of the outer cylinder barrel 3 form reliable connection and sealing; a reliable seal is formed between the first step 9-4 of the left end cover and the left end of the inner cylinder 5; a dustproof device and a sealing device are respectively arranged on the left side of the annular oil groove 9-1 of the left end cover between the left end cover 9 and the damper piston rod 7, and reliable dustproof and sealing are formed between the left end cover 9 and the damper piston rod 7; a sealing device and a guiding device are respectively arranged on the right side of the annular oil groove 9-1 of the left end cover between the left end cover 9 and the damper piston rod 7, and reliable sealing and guiding are formed between the left end cover 9 and the damper piston rod 7; the left pin head 10 and the left end of the damper piston rod 7 form reliable connection; the right inner annular groove 4-1 of the right piston of the auxiliary oil tank is communicated with the first oil through hole 2-3 of the right end cover; the left inner annular groove 8-1 of the left piston of the auxiliary oil tank is communicated with the first oil through hole 9-2 of the left end cover; a damper left working cavity A is formed between the left side of the damper piston 6 and the left end cover 9, a damper left working cavity B is formed between the right side of the damper piston 6 and the right end cover 2, and a return spring cavity C is formed between the auxiliary oil tank left piston 8 and the auxiliary oil tank right piston 4; an auxiliary oil tank left oil chamber D is formed between the left end cover 9 and the auxiliary oil tank left piston 8; an auxiliary oil tank right oil chamber E is formed between the right end cover 2 and the auxiliary oil tank right piston 4; an annular oil passage F is formed between the inner wall of the middle cylinder barrel 12 and the outer wall of the inner cylinder barrel 5; the left end cover annular oil groove 9-1, the left end cover first oil through hole 9-2, the left end cover second oil through hole 9-3, the auxiliary oil tank left oil chamber D, the annular oil through path F, the auxiliary oil tank right oil chamber E, the right end cover second oil through hole 2-4 and the right end cover first oil through hole 2-3 are communicated with each other; the hydraulic damper working oil is filled in the damper left working cavity A, the damper left working cavity B, the auxiliary oil tank left oil chamber D, the auxiliary oil tank right oil chamber E, the annular oil passage F and the communicated oil through holes and oil grooves through oil filling ports; and the working oil in the annular oil groove 9-1 of the left end cover is in a low-pressure state.

And the working oil in the auxiliary oil tank left oil chamber D and the auxiliary oil tank right oil chamber E is in a low-pressure state.

The working process is as follows:

when the damper piston rod 7 drives the damper piston 6 to move leftwards at a low speed, the first normally-open check valve 6-2 and the second normally-open check valve 6-3 of the damper piston are in a normally-open state. At the moment, on one hand, the working oil in the left working cavity A of the damper can flow into the left working cavity B of the damper through the first oil through hole 6-1 of the damper piston, the first normally open check valve 6-2 of the damper piston, the second normally open check valve 6-3 of the damper piston and the second oil through hole 6-4 of the damper piston, on the other hand, the working oil in the left working cavity A of the damper can also flow into the left working cavity B of the damper through the first oil through hole 6-1 of the damper piston, the damping hole 6-5 of the damper piston and the second oil through hole 6-4 of the damper piston, meanwhile, working oil in the right oil chamber E of the auxiliary oil tank can be supplemented into the left working chamber B of the damper through a first oil through hole 2-3 of the right end cover and a normally open check valve 2-1 of the right end cover and a damping hole 2-2 of the right end cover respectively;

when the damper piston rod 7 drives the damper piston 6 to move rightwards at a low speed, the damper piston first normally-open check valve 6-2 and the damper piston second normally-open check valve 6-3 are in a normally-open state. At the moment, on one hand, the working oil in the left working cavity B of the damper can flow into the left working cavity A of the damper through the second oil through hole 6-4 of the damper piston, the second normally open check valve 6-3 of the damper piston, the first normally open check valve 6-2 of the damper piston and the first oil through hole 6-1 of the damper piston, on the other hand, the working oil in the left working cavity B of the damper can also flow into the left working cavity A of the damper through the second oil through hole 6-4 of the damper piston, the damping hole 6-5 of the damper piston and the first oil through hole 6-1 of the damper piston, meanwhile, working oil in the left working cavity B of the damper can respectively flow into the right oil chamber E of the auxiliary oil tank through the right end cover normally open one-way valve 2-1 and the right end cover damping hole 2-2 and the right end cover first oil through hole 2-3;

when the damper piston rod 7 drives the damper piston 6 to move leftwards rapidly, the first normally open check valve 6-2 of the damper piston is in a locking state. At the moment, the working oil in the left working cavity A of the damper can only flow into the left working cavity B of the damper through the first oil through hole 6-1 of the damper piston, the damping hole 6-5 of the damper piston and the second oil through hole 6-4 of the damper piston, when the working oil flows through the damping hole 6-5 of the damper piston, a damping effect is formed, a damping force is generated on the damper piston 6, the external work is done outwards, the external energy is consumed, and the shock absorption and shock resistance effects are achieved, meanwhile, the working oil in the right oil chamber E of the auxiliary oil tank can be supplemented into the left working cavity B of the damper through the first oil through hole 2-3 of the right end cover and through the normally-open check valve 2-1 of the right end cover and the damping hole 2-2 of the right end cover respectively; because the working oil in the annular oil groove 9-1 of the left end cover is in a lower pressure state, the risk of external leakage of the working oil is reduced, and the working reliability of the oil damper is improved;

when the damper piston rod 7 drives the damper piston 6 to move rightwards rapidly, the second normally-open one-way valve 6-3 and the normally-open one-way valve 2-1 of the right end cover of the damper piston are in a locking state. At the moment, on one hand, the working oil in the left working cavity B of the damper can flow into the left working cavity A of the damper through the second oil through hole 6-4 of the damper piston, the damping hole 6-5 of the damper piston and the first oil through hole 6-1 of the damper piston, on the other hand, the working oil in the left working cavity B of the damper can also flow into the right oil chamber E of the auxiliary oil tank through the damping hole 2-2 of the right end cover and the first oil through hole 2-3 of the right end cover, and when the working oil flows through the damping hole 6-5 of the damper piston and the damping hole 2-2 of the right end cover, a damping effect is formed, damping force is generated on the damper piston 6, work is done outwards, external energy is consumed, and a shock absorption and shock resistance effect is achieved.

From the working process analysis of the hydraulic damper, it can be seen that the pressure of the working oil in the left end cover annular oil groove 9-1 is in a low state, and a sealing device between the left end cover 9 and the damper piston rod 7 of the hydraulic damper and on the left side of the left end cover annular oil groove 9-1 is always in a low-pressure working state, so that the risk of working oil leakage is reduced, and the working reliability of the oil damper is improved.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.