阅读说明：本技术 一种井下多功能服务车油气悬挂减震系统 (Oil-gas suspension damping system of underground multifunctional service vehicle ) 是由 候军强 罗祥 齐吉富 崔凯凯 刘鑫 李达 于 2021-08-26 设计创作，主要内容包括：本发明公开了一种井下多功能服务车油气悬挂减震系统,包括连杆、活塞和缸筒,活塞外周侧和缸筒内壁滑动密封连接,活塞下侧和连杆上端连接,缸筒内壁固定有位于活塞上方的分割板,分割板上开设有阻尼穿孔,阻尼穿孔上滑动密封穿设有滑动杆,滑动杆的下端和活塞的上侧连接,滑动杆外周侧沿其长度方向开设有内陷槽,内陷槽上沿其长度方向开设有导向深槽,导向深槽内滑动密封安装有滑动插杆,滑动杆外周侧开设有连通导向深槽下部内外的导液孔。本系统实现了在压缩行程和恢复行程不同的油液阻尼效果,实现本系统在恢复行程中快速复位、保证压缩行程的振幅,保证本系统的减震效果,并且降低油液受压升温导致的油液流动阻尼的变化。(The invention discloses an oil-gas suspension damping system of an underground multifunctional service vehicle, which comprises a connecting rod, a piston and a cylinder barrel, wherein the periphery side of the piston is connected with the inner wall of the cylinder barrel in a sliding and sealing manner, the lower side of the piston is connected with the upper end of the connecting rod, a partition plate positioned above the piston is fixed on the inner wall of the cylinder barrel, a damping through hole is formed in the partition plate, a sliding rod penetrates through the damping through hole in a sliding and sealing manner, the lower end of the sliding rod is connected with the upper side of the piston, an inner sunken groove is formed in the periphery side of the sliding rod along the length direction of the sliding rod, a guide deep groove is formed in the periphery side of the sliding rod along the length direction of the sliding rod, a sliding insertion rod is arranged in the guide deep groove in a sliding and sealing manner, and a liquid guide hole communicated with the inside and the outside of the lower part of the guide deep groove is formed in the periphery side of the sliding rod. This system has realized at the different fluid damping effect of compression stroke and recovery stroke, realizes that this system resets fast, guarantees the amplitude of compression stroke in recovering the stroke, guarantees the shock attenuation effect of this system to reduce the fluid flow damping's that fluid pressurized intensifies and leads to change.)

1. The utility model provides a multi-functional service truck oil gas hangs shock mitigation system in pit, includes connecting rod (2), piston (7) and lower extreme open-ended cylinder (1), the inner wall sliding seal of piston (7) periphery side and cylinder (1) is connected, the downside of piston (7) and the upper end of connecting rod (2) are connected, its characterized in that: a partition plate (6) positioned above a piston (7) is fixed on the inner wall of the cylinder barrel (1), a damping through hole is formed in the partition plate (6), a sliding rod (3) penetrates through the damping through hole in a sliding sealing mode, the lower end of the sliding rod (3) is connected with the upper side of the piston (7), an invagination groove is formed in the outer peripheral side of the sliding rod (3) along the length direction of the sliding rod, a guide deep groove (9) is formed in the invagination groove along the length direction of the invagination groove, and a sliding insertion rod (5) is installed in the invagination deep groove (9) in a sliding sealing mode;

and a thermal expansion sheet (4) is fixed at the position of the side surface of the sliding inserted rod (5) outside the guide deep groove (9).

2. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: the outer peripheral side of the sliding rod (3) is provided with a liquid guide hole (10) which is communicated with the inside and the outside of the lower part of the guide deep groove (9);

when the piston (7) is in a compression stroke, the sliding inserted rod (5) slides out of the guide deep groove (9), and the side surface of the sliding inserted rod (5) is in contact with the inner wall of the damping perforation;

when the piston (7) is in a recovery stroke, the sliding inserted bar (5) slides in the guide deep groove (9), and the side surface of the sliding inserted bar (5) is separated from the inner wall of the damping perforation.

3. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: the upper end and the lower end of the guide deep groove (9) are preferably in arc transition.

4. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: oil and gas are injected into the cylinder barrel (1), and the oil in the cylinder barrel (1) overflows the partition plate (6).

5. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: an adjusting assembly is arranged between the sliding rod (3) and the piston (7), the adjusting assembly comprises a first permanent magnet (11), a bracket (17) and a sleeve (14) sleeved on the sliding rod (3), the inner wall of the sleeve (14) is in threaded connection with the lower part of the outer periphery of the sliding rod (3), the lower end of the sleeve (14) is connected with the upper side of the piston (7) through a rotating part, and the outer periphery of the sleeve (14) is fixedly provided with the first permanent magnet (11) through the bracket (17);

and a driving mechanism (12) is installed on the upper part of the connecting rod (2), and a second permanent magnet (13) corresponding to the first permanent magnet (11) is installed on the driving mechanism (12).

6. The downhole utility vehicle pneumatic suspension shock absorption system of claim 5, wherein: the joint hole has been seted up to the lower extreme of slide bar (3), the upside of piston (7) is fixed with guide bar (16), guide bar (16) and joint hole slip joint.

7. The downhole utility vehicle pneumatic suspension shock absorption system of claim 5, wherein: the driving mechanism (12) is a hub motor or a flat hollow motor, the driving mechanism (12) comprises a stator and a rotor, the stator is located on the inner side and provided with a through hole, the rotor is located on the outer side, and the second permanent magnet (13) is installed on the rotor of the driving mechanism (12).

8. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: the lower part of the sleeve (14) is provided with a through hole communicated with the inside and the outside of the sleeve.

9. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: and a buffer piece (8) is fixed on the lower part of the inner wall of the cylinder barrel (1).

10. The downhole utility vehicle pneumatic suspension shock absorption system of claim 1, wherein: the opening part of the lower end of the cylinder barrel (1) is provided with a fixing plate, and the fixing plate is provided with a through hole matched with the connecting rod (2).

Technical Field

The invention relates to the technical field of suspension, in particular to an oil-gas suspension damping system of an underground multifunctional service vehicle.

Background

When the single-air-chamber oil-gas suspension is in a compression stroke, the piston rod assembly extends into the cylinder barrel, oil in the cylinder barrel is extruded and flows through the damping holes, the damping force of the oil is generated by the oil flowing through the damping holes, the elastic force is generated by compressed gas (inert gas such as nitrogen, argon and the like), the damping force provided by the damping holes is increased in a nonlinear manner along with the increase of the flow velocity of the oil, and the vibration of a vehicle can be rapidly reduced; when the stroke is recovered, the piston rod assembly is pulled away from the cylinder barrel, so that the volume of the cylinder barrel is enlarged, and the oil flows back from the cavity through the damping hole to generate damping force.

However, when the mine car travels in a mine tunnel or a mine, the smoothness of a traveling road is poor, the recovery speed of the conventional oil-gas suspension recovery stroke is influenced by the diameter of the cross section of the damping hole, the oil-gas suspension recovery speed is low, the amplitude of a compression stroke is influenced, and the damping effect of the oil-gas suspension is influenced.

Disclosure of Invention

The invention aims to overcome the existing defects and provide an underground multifunctional service vehicle oil-gas suspension damping system, which realizes quick reset in a recovery stroke, ensures the amplitude of the compression stroke and the damping effect of the system under the condition of different oil damping effects of the compression stroke and the recovery stroke, reduces the change of oil flow damping caused by the temperature rise of oil under pressure and can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a multi-functional service car oil gas in pit hangs shock mitigation system, includes connecting rod, piston and lower extreme open-ended cylinder, the inner wall sliding seal of piston periphery side and cylinder connects, the downside of piston and the upper end of connecting rod are connected, the cylinder inner wall is fixed with the partition plate that is located the piston top, it perforates to have seted up the damping on the partition plate, sliding seal wears to be equipped with the slide bar on the perforation of damping, the lower extreme of slide bar and the upside of piston are connected, the slide bar periphery side has seted up the undercut groove along its length direction, the direction deep trouth has been seted up along its length direction on the undercut groove, sliding seal installs the slip inserted bar in the direction deep trouth, the inside and outside drain hole in intercommunication direction deep trouth lower part has been seted up to the slide bar periphery side.

And a thermal expansion sheet is fixed at the position of the side surface of the sliding inserted bar outside the guide deep groove.

As a preferable aspect of the present invention, when the piston is in the compression stroke, the sliding rod slides out of the guide deep groove, and the side surface of the sliding rod contacts with the inner wall of the damping through hole, and when the piston is in the recovery stroke, the sliding rod slides into the guide deep groove, and the side surface of the sliding rod is separated from the inner wall of the damping through hole.

As a preferred technical scheme of the invention, the upper end and the lower end of the guide deep groove are in arc transition.

As a preferred technical scheme of the invention, oil liquid and gas are injected into the cylinder barrel, and the oil liquid in the cylinder barrel overflows the dividing plate.

As a preferred technical scheme of the invention, an adjusting assembly is arranged between the sliding rod and the piston, the adjusting assembly comprises a first permanent magnet, a bracket and a sleeve sleeved on the sliding rod, the inner wall of the sleeve is in threaded connection with the lower part of the outer periphery of the sliding rod, the lower end of the sleeve is connected with the upper side of the piston through a rotating part, and the outer periphery of the sleeve is fixed with the first permanent magnet through the bracket;

and a driving mechanism is installed at the upper part of the connecting rod, and a second permanent magnet corresponding to the first permanent magnet is installed on the driving mechanism.

As a preferable technical scheme of the invention, the lower end of the sliding rod is provided with a clamping hole, the upper side of the piston is fixed with a guide rod, and the guide rod is clamped with the clamping hole in a sliding manner.

As a preferred embodiment of the present invention, the driving mechanism is a hub motor or a flat hollow motor, the driving mechanism includes a stator located inside and provided with a through hole and a rotor located outside, and the second permanent magnet is mounted on the rotor of the driving mechanism.

As a preferable technical scheme of the invention, the lower part of the sleeve is provided with a through hole communicated with the inside and the outside of the sleeve.

In a preferred embodiment of the present invention, a buffer member is fixed to a lower portion of an inner wall of the cylinder.

As a preferred technical scheme of the invention, a fixing plate is arranged at an opening at the lower end of the cylinder barrel, and a through hole matched with the connecting rod is formed in the fixing plate.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the oil-gas suspension damping system of the underground multifunctional service vehicle, on one hand, the sliding inserted rod extends out of the guiding deep groove in the compression stroke and slides in the guiding deep groove in the recovery stroke, so that the switching of the flow cross-sectional area of oil liquid in the compression stroke and the recovery stroke of a damping perforation is realized, the oil-gas suspension damping system of the underground multifunctional service vehicle is convenient to recover quickly after being impacted, and the damping effect of the oil-gas suspension damping system of the underground multifunctional service vehicle is ensured; on the other hand, the thermal expansion sheet expands when heated, the horizontal cross section area of the thermal expansion sheet is increased, the oil flow cross section area at the damping perforation is reduced, the oil flow is blocked, and the stable pressure flow of the oil is realized.

2. According to the oil-gas suspension damping system of the underground multifunctional service vehicle disclosed by the invention, when the piston is in a compression stroke, the sliding insertion rod slides outside the guide deep groove, the side surface of the sliding insertion rod is in contact with the inner wall of the damping perforation, oil liquid below the partition plate flows out through the gap between the damping hole and the sliding insertion rod to realize damping, when the piston is in a recovery stroke, the sliding insertion rod slides into the guide deep groove, the side surface of the sliding insertion rod is separated from the inner wall of the damping perforation, the oil liquid below the partition plate flows out through the gap between the damping hole and the sliding insertion rod, and as the cross section of the oil liquid flowing through the partition plate is increased, the quick reset of the oil-gas suspension damping system of the underground multifunctional service vehicle is realized, and the stroke of the compression stroke and the damping effect of the oil-gas suspension damping system of the underground multifunctional service vehicle are ensured.

3. According to the oil-gas suspension damping system of the underground multifunctional service vehicle, the thermal expansion pieces expand when heated, the horizontal cross section area of the thermal expansion pieces is increased, the flowing performance of oil is blocked, the stable flowing of the oil is realized, the flowing performance of the oil becomes good when the oil is heated, the oil flowing speed at the damping holes of the partition plates is increased, the damping effect of the oil is weakened, the thermal expansion pieces are heated, the flowing cross section of the oil at the arc-shaped notch is reduced, the oil flowing speed at the arc-shaped notch is reduced, and the influence caused by the overheating of the oil is reduced.

4. According to the oil-gas suspension damping system of the underground multifunctional service vehicle disclosed by the invention, the sleeve rotates relative to the sliding rod to enable the sliding rod to move relative to the position of the piston, so that the position of the sunken groove in the sliding rod, which corresponds to the partition plate, is kept in a certain range, and the damping effect of the oil-gas suspension damping system of the underground multifunctional service vehicle is ensured.

5. According to the oil-gas suspension damping system of the underground multifunctional service vehicle disclosed by the invention, when the piston moves and is close to the opening of the cylinder barrel, the damping piece is contacted with the piston, and the damping piece provides extra damping resistance for the piston, so that the stroke of the piston is limited, and the piston is prevented from being separated from the cylinder barrel; and the buffer piece avoids the impact collision between the driving mechanism and the fixing plate, thereby ensuring the safety of the driving mechanism.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the partial cross-sectional structure of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 2 showing the slide rod and the slide insert rod separated from each other;

FIG. 4 is a schematic cross-sectional view of the slide rod and the slide rod during the compression stroke of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the slide rod and the slide rod during the return stroke of FIG. 1;

FIG. 6 is a schematic structural diagram of another embodiment of the present invention;

FIG. 7 is an enlarged view of the structure at A in FIG. 6;

FIG. 8 is a cross-sectional structural view of the compression stroke of FIG. 6;

fig. 9 is a sectional structural view of a recovery stroke of fig. 6.

In the figure: the device comprises a cylinder barrel 1, a connecting rod 2, a sliding rod 3, a thermal expansion sheet 4, a sliding inserted rod 5, a partition plate 6, a piston 7, a buffer member 8, a guide deep groove 9, a liquid guide hole 10, a first permanent magnet 11, a driving mechanism 12, a second permanent magnet 13, a sleeve 14, a limiting groove 15, a guide rod 16 and a bracket 17.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: referring to fig. 1-5, the present embodiment discloses a downhole multi-function service cart oil-gas suspension damping system, which includes a connecting rod 2, a piston 7, and a cylinder 1 with an opening at the lower end, wherein the outer peripheral side of the piston 7 is connected with the inner wall of the cylinder 1 in a sliding and sealing manner, the lower side of the piston 7 is connected with the upper end of the connecting rod 2, a partition plate 6 is fixed on the inner wall of the cylinder 1, the partition plate 6 is located above the piston 7, a vertical damping through hole is formed on the partition plate 6, a sliding rod 3 is penetrated through the damping through hole in a sliding and sealing manner, the lower end of the sliding rod 3 is connected with the upper side of the piston 7, when the piston 7 moves up and down, the piston 7 drives the sliding rod 3 to move up and down along the damping through hole, an inner concave groove is formed on the outer peripheral side of the sliding rod 3 along the length direction, the upper and lower ends of the inner concave groove are sealed, a guiding deep groove 9 is formed on the inner concave groove along the length direction, a sliding and sealing manner is provided with a sliding insertion rod 5, the periphery of the sliding rod 3 is provided with a liquid guide hole 10 which is communicated with the inside and the outside of the lower part of the guide deep groove 9.

Wherein, when the piston 7 is in the compression stroke, the sliding inserted bar 5 slides to the outside of the guiding deep groove 9, the side surface of the sliding inserted bar 5 is contacted with the inner wall of the damping perforation, and the sliding inserted bar 5 keeps blocking the guiding deep groove 9.

When the piston 7 is in the return stroke, the sliding inserted rod 5 slides in the guiding deep groove 9, and the side surface of the sliding inserted rod 5 is separated from the contact with the inner wall of the damping perforation.

Specifically, as shown in fig. 2 and 3, the thermal expansion piece 4 is fixed to the side surface of the slide insert rod 5 at a position outside the guide deep groove 9, and the thermal expansion piece 4 does not affect the sliding of the slide insert rod 5 along the guide deep groove 9.

Preferably, the upper end and the lower end of the guide deep groove 9 are both in arc transition.

In the present embodiment, oil and gas are injected into the cylinder 1, and the oil in the cylinder 1 flows over the partition plate 6.

The working process and principle of the embodiment are as follows:

the middle part of the sunken groove of the sliding rod 3 is arranged corresponding to the dividing plate 6.

When the underground multifunctional service vehicle oil-gas suspension damping system is in a compression stroke, the piston 7 moves towards the inside of the cylinder barrel 1, at the moment, the pressure of oil below the partition plate 6 is greater than that of oil above the partition plate 6, the oil below the partition plate 6 enters the guide deep groove 9 of the sliding rod 3 through the liquid guide hole 10, the gas at the upper part of the inner cavity of the cylinder barrel 1 is compressed to a smaller volume, the pressure on the outer side surface of the sliding insertion rod 5 is smaller than that on the inner part of the guide deep groove 9 of the sliding insertion rod 5, the sliding insertion rod 5 slides towards the outside of the guide deep groove 9, the side surface of the sliding insertion rod 5 is in contact with the inner wall of the damping through hole, and the oil below the partition plate 6 flows out through the gap between the damping hole and the sliding insertion rod 5, so that damping is realized.

When the piston 7 is in a recovery stroke, the piston 7 moves towards the outside of the cylinder barrel 1, the pressure of oil below the dividing plate 6 is lower than that of oil above the dividing plate 6, the oil in the guide deep groove 9 flows to the lower part of the dividing plate 6 through the liquid guide hole 10, the sliding insertion rod 5 slides in the guide deep groove 9, the side surface of the sliding insertion rod 5 is separated from the inner wall of the damping through hole, the oil below the dividing plate 6 flows out through the enlarged gap between the damping hole and the sliding insertion rod 5, and the cross section of the oil flowing through the dividing plate 6 is enlarged, so that the quick reset of the oil-gas suspension damping system of the underground multifunctional service vehicle is realized.

The fluid frequently pressurized converts partial mechanical energy into heat energy, fluid is heated mobility and becomes good, the damping effect variation of fluid, the heat expansion piece adopts the metal of big expansion coefficient like copper, aluminium, copper alloy etc, heat expansion piece 4 is heated its horizontal cross sectional area increase of expansion and hinders the flow property of fluid, realize the steady voltage of fluid and flow, fluid is heated mobility and becomes good, the fluid velocity of flow grow of 6 damping holes department of partition plate makes the damping effect weak, and heat expansion piece 4 is heated the cross section that the fluid that reduces arc breach department flows, make arc breach fluid velocity of flow diminish, reduce the overheated influence that causes of fluid.

The thermal expansion coefficient of the thermal expansion sheet is larger than the thermal expansion coefficient of the slide insert rod 5 and the thermal expansion coefficient of the partition plate 6, and the slide insert rod 5 and the partition plate 6 are made of cast iron or heat-resistant steel.

Both ends are the arc transition about the direction deep trouth 9, move to the position that is close to direction deep trouth 9 tip when cutting board 6, the cross section that 6 damping hole department fluid of cutting board flows diminishes, avoid slide bar 3 and 6 damping holes of cutting board to break away from, guarantee this multi-function service car oil gas in pit and hang damping system's reliability, and this multi-function service car oil gas in pit hangs the terminal damping effect reinforcing of damping system travel, strengthen this multi-function service car oil gas in pit and hang damping system to the shock attenuation effect of strikeing by a wide margin.

Example two: as shown in fig. 6-9, the present embodiment discloses a pneumatic suspension damping system for a downhole multi-function service vehicle, which has a structure substantially the same as that of the first embodiment, except that an adjusting assembly is disposed between the sliding rod 3 and the piston 7, the adjusting assembly includes a first permanent magnet 11, a bracket 17, and a sleeve 14 sleeved on the sliding rod 3, an inner wall of the sleeve 14 is in threaded connection with a lower portion of an outer peripheral side of the sliding rod 3, a lower end of the sleeve 14 is connected with an upper side of the piston 7 through a rotating member, the rotating member includes but is not limited to a bearing or a rotating pin ring, and the first permanent magnet 11 is fixed on the outer peripheral side of the sleeve 14 through the bracket 17;

a drive mechanism 12 is attached to an upper portion of the link 2, and a second permanent magnet 13 corresponding to the first permanent magnet 11 is attached to the drive mechanism 12.

Furthermore, the lower part of the sleeve 14 is provided with a through hole for communicating the inside and the outside of the sleeve 14, so that the inside and the outside of the sleeve 14 are communicated, and oil is filled or discharged from the inside of the sleeve 14 when the sliding rod 3 moves up and down.

The lower part of the outer periphery of the sliding rod 3 is provided with a first thread, the inner wall of the sleeve 14 is provided with a second thread matched with the first thread, the sleeve 14 is in threaded connection with the sliding rod 3, and when the sleeve 14 rotates relative to the sliding rod 3, the sleeve 14 moves along the length direction of the sliding rod 3.

Wherein the slide bar 3 cannot rotate about the vertical axis.

The working process and principle of the embodiment are as follows:

when the underground multifunctional service vehicle oil-gas suspension damping system is installed between a carriage and a frame of a mine car, the pressure of gas in the cylinder barrel 1 is low and the pressure of oil is low when the carriage of the mine car is in no-load; when the carriage of mine car was in when loading overweight goods, gas received pressure grow, the volume diminishes in 1 cylinder, and the length grow of 6 tops of partition plate is stretched into to the last indent groove of slide bar 3, and the distance of its compression stroke is little when this multi-functional service car oil gas suspension damping system in pit receives the impact, influences this multi-functional service car oil gas suspension damping system's in pit shock attenuation effect.

Actuating mechanism 12 drives second permanent magnet 13 and rotates, and the magnetic attraction between second permanent magnet 13 and the first permanent magnet 11 drives first permanent magnet 11 and rotates, and first permanent magnet 11 passes through support 17 and drives sleeve pipe 14 rotatory, and sleeve pipe 14 makes slide bar 3 reciprocate for piston 7 position for slide bar 3 is rotatory, makes the position that the indent groove corresponds division board 6 on the slide bar 3 keep at certain extent, guarantees this multi-function service car oil gas suspension damping system's in pit shock attenuation effect.

Example three: as shown in fig. 6 and 7, the present embodiment discloses a pneumatic suspension damping system for a downhole multi-function service vehicle, which has a structure substantially the same as that of the second embodiment, except that a clamping hole is formed at the lower end of the sliding rod 3 of the present embodiment, a guide rod 16 is fixed at the upper side of the piston 7, the upper portion of the guide rod 16 is slidably clamped with the clamping hole, the horizontal cross section of the guide rod 16 is a non-circular section such as a rectangle, an ellipse, or a triangle, the preferred outer peripheral side of the guide rod 16 is vertically provided with a vertical recessed groove or a gap exists between the guide rod 16 and the clamping hole, so as to realize the flow of oil inside and outside the clamping hole, the sliding rod 3 enables the guide rod 16 to move up and down and cannot rotate around a vertical shaft, and the position of the sliding rod 3 relative to the piston 7 is adjusted by an adjusting component.

In another preferred embodiment, the sliding bar 3 has a non-circular plane in horizontal cross section.

Example four: as shown in fig. 6, 8 and 9, the present embodiment discloses a pneumatic suspension damping system for a downhole multi-function service vehicle, in the second or third embodiment, the driving mechanism 12 of the present embodiment is a hub motor or a flat hollow motor, the driving mechanism 12 includes a stator located at the inner side and provided with a through hole and a rotor located at the outer side, the connecting rod 2 passes through the through hole of the stator of the driving mechanism 12 and the stator of the driving mechanism 12 is fixedly connected with the connecting rod 2, and the second permanent magnet 13 is mounted on the rotor of the driving mechanism 12.

The input of the drive mechanism 12 is electrically connected to the output of an external control switch.

The first permanent magnet 11 includes, but is not limited to, neodymium iron boron magnet, ferrite magnet, alnico magnet, samarium cobalt magnet; the second permanent magnet 13 includes, but is not limited to, neodymium iron boron magnets, ferrite magnets, alnico magnets, samarium cobalt magnets.

Preferably, a gap is provided between each of the second permanent magnet 13 and the first permanent magnet 11 and the surface of the piston 7, so that the friction force when the second permanent magnet 13 and the first permanent magnet 11 move relative to the piston 7 is reduced.

Preferably, the central axis of the sleeve 14 and the central axis of the drive mechanism 12 coincide.

The hub motor or the flat hollow motor used in the present invention are common electronic components in the prior art, and the working mode and the circuit structure thereof are well known technologies, which are not described herein.

The driving mechanism 12 drives the second permanent magnet 13 to rotate, the magnetic attraction between the second permanent magnet 13 and the first permanent magnet 11 drives the first permanent magnet 11 to rotate, the first permanent magnet 11 drives the sleeve 14 to rotate through the bracket 17, and the sleeve 14 rotates relative to the sliding rod 3 to enable the sliding rod 3 to move relative to the piston 7.

The drive mechanism 12 may also be replaced with a hollow hydraulic motor of the type commonly used in the art, which includes an inner stator and an outer rotor.

Example five: as shown in fig. 1-9, the present embodiment discloses a gas suspension damping system for a downhole multi-function service vehicle, and on the basis of the first embodiment, the second embodiment, the third embodiment or the fourth embodiment, a buffer member 8 is fixed on the lower portion of the inner wall of the cylinder barrel 1 of the present embodiment; the buffer 8 is an elastic air bag, a spring or an elastic block, when the piston 7 moves and is close to the opening of the cylinder barrel 1, the buffer 8 is in contact with the piston 7, the buffer 8 provides extra buffer resistance for the piston 7, the stroke of the piston 7 is limited, and the piston 7 is prevented from being separated from the cylinder barrel 1.

Furthermore, a fixing plate is arranged at an opening at the lower end of the cylinder barrel 1, and a through hole matched with the connecting rod 2 is formed in the fixing plate.

The through hole on the fixing plate carries out auxiliary support to the connecting rod 2, avoids the connecting rod 2 to incline askew to guarantee the leakproofness between piston 7 and the cylinder 1 inner wall, and the buffer avoids actuating mechanism 12 and fixing plate impact collision, guarantees actuating mechanism 12's safety.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.