阅读说明：本技术 一种具有缓冲结构的叉车门架 (Fork truck portal with buffer structure ) 是由 叶国云 储江 郭宏斌 叶青云 傅敏 于 2021-10-15 设计创作，主要内容包括：本发明涉及叉车技术领域,具体是涉及一种具有缓冲结构的叉车门架,包括外门架、内门架和货叉架、液压缸、油泵和缓冲结构,缓冲结构包括分流器、蓄能器和释能器,所述分流器设置在外门架和内门架的顶端,分流器包括触发部,分流器还包括进油口、出油口和分油口,进油口与油泵的输油端连通,出油口与液压缸的一连通口连通；蓄能器包括蓄能部,蓄能部与分油口连通,蓄能器还包括蓄能状态下能够相对外界移动的传导部；释能器设置在蓄能器一侧,释能器包括驱动部,本申请的缓冲结构中的分流器对油泵与液压缸之间的液压油进行分流,并将其储存在蓄能器中,无需加大油泵负荷,且结构稳定,易于安装。(The invention relates to the technical field of forklifts, in particular to a forklift mast with a buffering structure, which comprises an outer mast, an inner mast, a fork frame, a hydraulic cylinder, an oil pump and the buffering structure, wherein the buffering structure comprises a shunt, an energy accumulator and an energy releaser, the shunt is arranged at the top ends of the outer mast and the inner mast, the shunt comprises a trigger part, and further comprises an oil inlet, an oil outlet and an oil distributing port, the oil inlet is communicated with an oil conveying end of the oil pump, and the oil outlet is communicated with a communicating port of the hydraulic cylinder; the energy accumulator comprises an energy storage part, the energy storage part is communicated with the oil distributing port, and the energy accumulator further comprises a conduction part which can move relative to the outside in an energy storage state; the energy release ware sets up in energy storage ware one side, and the energy release ware includes the drive division, and the shunt among the buffer structure of this application shunts the hydraulic oil between oil pump and the pneumatic cylinder to store it in the energy storage ware, need not to increase the oil pump load, and stable in structure, easily installation.)

1. A forklift mast with a buffering structure comprises an outer mast (1), an inner mast (2), a fork frame (3), hydraulic cylinders for driving the inner mast (2) to slide relative to the outer mast (1) and the fork frame (3) to slide relative to the inner mast (2) and oil pumps for driving the hydraulic cylinders to output, and is characterized by further comprising the buffering structure which comprises a flow divider (4), an energy accumulator (5) and an energy release device (6),

the flow divider (4) is arranged at the top ends of the outer gantry (1) and the inner gantry (2), the flow divider (4) comprises a trigger part, the trigger part projects at the top end of the inner gantry (2) or the fork frame (3) along the output direction of the hydraulic cylinder, the flow divider (4) further comprises an oil inlet, an oil outlet and an oil distributing opening, the oil inlet is communicated with the oil conveying end of the oil pump, the oil outlet is communicated with a communicating opening of the hydraulic cylinder, and the oil inlet is communicated with the oil outlet under the action of no external force of the trigger part; under the continuous action of external force, the state that the oil inlet is communicated with the oil outlet is firstly converted into the state that the oil inlet, the oil outlet and the oil distributing opening are communicated, and then the state that the oil outlet is communicated with the oil distributing opening is converted into the state that the oil outlet is communicated with the oil distributing opening;

the energy accumulator (5) comprises an energy storage part, the energy storage part is communicated with the oil distributing opening and is used for storing hydraulic oil when the oil inlet, the oil outlet and the oil distributing opening are communicated with each other, and the energy accumulator (5) further comprises a conduction part which can move relative to the outside in an energy storage state;

energy release ware (6) set up in energy storage ware (5) one side, energy release ware (6) including can cause the drive division that conduction portion resets, and energy release ware (6) are used for when oil outlet portion and part oil portion intercommunication drive division transmission conduction portion release the hydraulic oil in energy storage ware (5).

2. The forklift mast with buffer structure according to claim 1, characterized in that the diverter (4) comprises a first sealing cylinder (4 a), a first movable plug (4 b) and a first butting rod (4 c),

the first sealing cylinder (4 a) is arranged at the top end of the outer gantry (1) or the inner gantry (2) in the vertical direction, the first sealing cylinder (4 a) projects to the top end of the inner gantry (2) or the fork frame (3) in the output direction of the hydraulic cylinder, an oil inlet pipe (4 a 1), an oil outlet pipe (4 a 2) and an oil distribution pipe (4 a 3) which extend along the radial direction of the first sealing cylinder are sequentially arranged on the circumferential surface of the first sealing cylinder (4 a) from bottom to top, the oil inlet pipe (4 a 1) is communicated with the oil delivery end of an oil pump, the oil outlet pipe (4 a 2) is communicated with a communication port of the hydraulic cylinder, and the oil distribution pipe (4 a 3) is communicated with an energy storage part of the energy accumulator (5);

the first movable plug (4 b) is coaxially arranged in the first sealing cylinder (4 a) in a sliding mode, the inner cavity of the first sealing cylinder (4 a) is divided into an upper cavity and a lower cavity which are mutually independent by the first movable plug (4 b), a first annular groove (4 b 1) which is coaxial with the first movable plug (4 b) is arranged on the circumferential surface of the first movable plug (4 b), and when the first movable plug (4 b) abuts against the bottom end of the inner cavity of the first sealing cylinder (4 a), the oil inlet pipe (4 a 1), the first annular groove (4 b 1) and the oil outlet pipe (4 a 2) are communicated; when the oil distribution pipe (4 a 3), the first ring groove (4 b 1) and the oil outlet pipe (4 a 2) are communicated, the first movable plug (4 b) seals the oil inlet pipe (4 a 1);

the first abutting rod (4 c) is coaxially and fixedly arranged at the bottom end of the first movable plug (4 b), and the first abutting rod (4 c) penetrates through the bottom end of the first sealing cylinder (4 a) along the axial direction.

3. The forklift mast with buffer structure according to claim 1, characterized in that the diverter (4) comprises a first sealing cylinder (4 a), a first movable plug (4 b) and a first butting rod (4 c),

the first sealing cylinder (4 a) is arranged at the top end of the outer portal frame (1) or the inner portal frame (2) in the vertical direction, the first sealing cylinder (4 a) projects at the top end of the inner portal frame (2) or the fork frame (3) in the output direction of the hydraulic cylinder, an oil inlet pipe (4 a 1), an oil outlet pipe (4 a 2) and an oil distribution pipe (4 a 3) which extend along the radial direction of the first sealing cylinder (4 a) are sequentially arranged on the circumferential surface of the first sealing cylinder (4 a) from bottom to top, the oil inlet pipe (4 a 1) is communicated with the oil delivery end of an oil pump, the oil outlet pipe (4 a 2) is communicated with a communication port of the hydraulic cylinder, the oil distribution pipe (4 a 3) is communicated with the energy storage part of the energy accumulator (5), and the oil inlet pipe (4 a 1), the oil outlet pipe (4 a 2) and the oil distribution pipe (4 a 3) are positioned on the same radial vertical surface of the first sealing cylinder (4 a);

the first movable plug (4 b) is coaxially arranged in the first sealing cylinder (4 a) in a sliding mode, the inner cavity of the first sealing cylinder (4 a) is divided into an upper cavity and a lower cavity which are independent of each other by the first movable plug (4 b), an oil hole (4 b 2) penetrating along the radial direction of the first movable plug (4 b) is formed in the first movable plug (4 b), and when the first movable plug (4 b) abuts against the bottom end of the inner cavity of the first sealing cylinder (4 a), the oil inlet pipe (4 a 1), the oil hole (4 b 2) and the oil outlet pipe (4 a 2) are communicated; when the oil distribution pipe (4 a 3), the oil hole (4 b 2) and the oil outlet pipe (4 a 2) are communicated, the first movable plug (4 b) blocks the oil inlet pipe (4 a 1);

the first abutting rod (4 c) is coaxially and fixedly arranged at the bottom end of the first movable plug (4 b), and the first abutting rod (4 c) penetrates through the bottom end of the first sealing cylinder (4 a) along the axial direction.

4. The forklift mast with a buffering structure as claimed in claim 3, wherein the first sealing cylinder (4 a) is uniformly provided at its inner circumference with an oil inlet pipe (4 a 1) extending axially therealong, the first movable plug (4 b) is uniformly provided at its circumferential surface with a stopper groove (4 b 3) extending radially therealong, and the stopper groove (4 b 3) is axially slidably fitted with the oil inlet pipe (4 a 1).

5. The forklift mast with the buffering structure as claimed in any one of claims 2-4, wherein the flow divider (4) further comprises a first spring (4 d), a bottom end of the circumferential surface of the first butt rod (4 c) is coaxially provided with a spacing ring (4 c 1), the first spring (4 d) is sleeved on the first butt rod (4 c), and two ends of the first spring (4 d) abut against the bottom end of the first sealing barrel (4 a) and the top end of the spacing ring (4 c 1), respectively.

6. The forklift mast with a buffering structure as claimed in claim 5, further comprising a pressure sensor (7), wherein the pressure sensor (7) is arranged on a connecting pipeline between the oil delivery end of the oil pump and the oil inlet pipe (4 a 1).

7. The forklift mast with buffering structure according to any one of claims 2 to 4, characterized in that the accumulator (5) comprises a second sealing cylinder (5 a), a second movable plug (5 b), a second butting rod (5 c) and a second spring (5 d),

the second sealing cylinder (5 a) is arranged on one side of the flow divider (4);

the second movable plug (5 b) is coaxially and slidably arranged in the second sealing cylinder (5 a), the inner cavity of the second sealing cylinder (5 a) is divided into an energy storage cavity and a compression cavity which are mutually independent by the second movable plug (5 b), and the energy storage cavity is communicated with the oil distribution pipe (4 a 3);

the second abutting rod (5 c) is coaxially arranged in the compression cavity, one end of the second abutting rod (5 c) is fixedly connected with the second movable plug (5 b), the other end of the second abutting rod (5 c) axially penetrates through the second sealing cylinder (5 a), the energy releaser (6) is coaxially arranged at one end of the second sealing cylinder (5 a), and the driving part of the energy releaser (6) faces the outer end of the second abutting rod (5 c).

8. The forklift mast with a buffering structure according to claim 7, characterized in that the energy accumulator (5) further comprises a second spring (5 d), the second spring (5 d) is sleeved on the second movable plug (5 b), and two ends of the second spring (5 d) respectively abut against the second movable plug (5 b) and the opposite end of the compression cavity.

9. The forklift mast with the buffering structure as claimed in claim 7, wherein the accumulator (5) further comprises a sealing ring (5 e), the sealing ring (5 e) is sleeved on the circumferential surface of the second movable plug (5 b), and the sealing ring (5 e) is in interference fit with the inner circumferential surface of the second sealing cylinder (5 a).

10. The forklift mast with a buffering structure according to claim 7, characterized in that the energy release device (6) comprises a bracket (6 a) and an electric push rod (6 b), the bracket (6 a) is coaxially arranged at one end of the second sealing cylinder (5 a) positioned in the compression cavity thereof, the electric push rod (6 b) is fixedly arranged on the bracket (6 a), and the end of the output shaft of the electric push rod (6 b) is coaxially towards the outer end of the second butting rod (5 c).

Technical Field

The invention relates to the technical field of forklifts, in particular to a forklift gantry with a buffering structure.

Background

When the forklift mast is lifted to the top, namely after the stroke of the oil cylinder is finished, large impact can be caused due to the action of inertia and heavy objects, so that the vibration of the whole forklift is brought, and the discomfort of a driver is caused; in addition, the impact also affects the safety and stability of the cargo.

At present, few forklift hoisting systems have the upper buffer mechanism when the gantry is hoisted to the top, only a few of the forklift hoisting systems realize the buffer function through hoisting the oil cylinder, the throttling technology is adopted in the oil cylinder, the structure is complex, the processing difficulty is large, the cost is high, and once the oil cylinder fails in buffering, the forklift hoisting system is not reliable.

Chinese patent CN201922067582.6 discloses a high-low position speed-limiting buffer device of a forklift mast, which comprises an outer mast and an inner mast which are connected in a vertical sliding manner, wherein a lifting oil cylinder for driving the outer mast to slide vertically is arranged on the inner mast, and the high-low position speed-limiting buffer device also comprises a high position speed-limiting buffer part and a low position speed-limiting buffer part which are arranged on the mast; the high-position speed-limiting buffer part comprises a position switch positioned on the outer gantry of the forklift and an induction support plate positioned on the inner gantry of the forklift; the low-position speed-limiting buffer part comprises a lifting oil cylinder, a guide post is arranged at the bottom end of the oil cylinder main body, and the guide post and the spacer bush are correspondingly arranged.

This buffer is through the pipe diameter that reduces the pipeline that hydraulic oil flows for the flow of hydraulic oil reduces, leads to the output speed of pneumatic cylinder to reduce, but, the velocity of flow of hydraulic oil can increase, and the flow variation that leads to hydraulic oil is few, is difficult to play the purpose that reduces pneumatic cylinder output speed, simultaneously, still can lead to the fact great load for the oil pump, influences the steady operation of oil pump and life-span, and can cause the temperature rise of narrow footpath department hydraulic oil.

Disclosure of Invention

In view of this, it is necessary to provide a forklift mast with a buffering structure to solve the problems in the prior art.

In order to solve the problems of the prior art, the invention adopts the technical scheme that:

a forklift mast with a buffering structure comprises an outer mast, an inner mast and a fork frame which are sequentially arranged in a sliding manner, a hydraulic cylinder for driving the inner mast to slide relative to the outer mast and the fork frame to slide relative to the inner mast, and an oil pump for driving the hydraulic cylinder to output, wherein the buffering structure comprises a shunt, an energy accumulator and an energy releaser; under the continuous action of external force, the state that the oil inlet is communicated with the oil outlet is firstly converted into the state that the oil inlet, the oil outlet and the oil distributing opening are communicated, and then the state that the oil outlet is communicated with the oil distributing opening is converted into the state that the oil outlet is communicated with the oil distributing opening; the energy accumulator comprises an energy storage part, a transmission part and a hydraulic oil storage part, wherein the energy storage part is communicated with the oil distributing port and is used for storing hydraulic oil when the oil inlet, the oil outlet and the oil distributing port are communicated with each other; the energy release device is arranged on one side of the energy accumulator and comprises a driving part capable of triggering the reset of the conduction part, and the energy release device is used for releasing hydraulic oil in the energy accumulator by the driving part when the oil outlet part is communicated with the oil distribution part.

Preferably, the flow divider comprises a first sealing cylinder, a first movable plug and a first butt rod, the first sealing cylinder is arranged at the top end of the outer gantry or the inner gantry along the vertical direction, the first sealing cylinder projects at the top end of the inner gantry or the fork frame along the output direction of the hydraulic cylinder, an oil inlet pipe, an oil outlet pipe and an oil distribution pipe which extend along the radial direction of the first sealing cylinder are sequentially arranged on the circumferential surface of the first sealing cylinder from bottom to top, the oil inlet pipe is communicated with the oil delivery end of the oil pump, the oil outlet pipe is communicated with a communication port of the hydraulic cylinder, and the oil distribution pipe is communicated with the energy storage part of the energy accumulator; the first movable plug is coaxially and slidably arranged in the first sealing cylinder, the inner cavity of the first sealing cylinder is divided into an upper cavity and a lower cavity which are mutually independent by the first movable plug, a first annular groove coaxial with the first movable plug is arranged on the circumferential surface of the first movable plug, and when the first movable plug is abutted against the bottom end of the inner cavity of the first sealing cylinder, the oil inlet pipe, the first annular groove and the oil outlet pipe are communicated; when the oil distribution pipe, the first annular groove and the oil outlet pipe are communicated, the first movable plug blocks the oil inlet pipe; first butt pole sets up the bottom at first activity stopper with the axial is fixed, and first butt pole runs through the bottom of a first sealed section of thick bamboo along the axial.

Preferably, the flow divider comprises a first sealing cylinder, a first movable plug and a first butt rod, the first sealing cylinder is arranged at the top end of the outer gantry or the inner gantry along the vertical direction, the first sealing cylinder projects at the top end of the inner gantry or the fork frame along the output direction of the hydraulic cylinder, an oil inlet pipe, an oil outlet pipe and an oil distribution pipe which extend along the radial direction of the first sealing cylinder are sequentially arranged on the circumferential surface of the first sealing cylinder from bottom to top, the oil inlet pipe is communicated with the oil delivery end of the oil pump, the oil outlet pipe is communicated with a communication hole of the hydraulic cylinder, the oil distribution pipe is communicated with an energy storage part of the energy accumulator, and the oil inlet pipe, the oil outlet pipe and the oil distribution pipe are positioned on the same radial vertical surface of the first sealing cylinder; the first movable plug is coaxially and slidably arranged in the first sealing cylinder, the inner cavity of the first sealing cylinder is divided into an upper cavity and a lower cavity which are independent of each other by the first movable plug, an oil hole penetrating through the first movable plug along the radial direction of the first movable plug is formed in the first movable plug, and when the first movable plug is abutted against the bottom end of the inner cavity of the first sealing cylinder, the oil inlet pipe, the oil hole and the oil outlet pipe are communicated; when the oil distribution pipe, the oil hole and the oil outlet pipe are communicated, the first movable plug blocks the oil inlet pipe; first butt pole sets up the bottom at first activity stopper with the axial is fixed, and first butt pole runs through the bottom of a first sealed section of thick bamboo along the axial.

Preferably, the oil inlet pipe extending along the axial direction of the first sealing cylinder is uniformly arranged on the inner periphery of the first sealing cylinder, the limiting groove extending along the radial direction of the first sealing cylinder is uniformly arranged on the circumferential surface of the first movable plug, and the limiting groove is in sliding fit with the oil inlet pipe along the axial direction.

Preferably, the shunt further comprises a first spring, a limiting ring is coaxially arranged at the bottom end of the circumferential surface of the first abutting rod, the first spring is sleeved on the first abutting rod, and two ends of the first spring abut against the bottom end of the first sealing barrel and the top end of the limiting ring respectively.

Preferably, the oil pump further comprises a pressure sensor, and the pressure sensor is arranged on a connecting pipeline between the oil delivery end of the oil pump and the oil inlet pipe.

Preferably, the accumulator comprises a second sealing cylinder, a second movable plug, a second abutting rod and a second spring, and the second sealing cylinder is arranged on one side of the flow divider; the second movable plug is coaxially and slidably arranged in the second sealing cylinder, the inner cavity of the second sealing cylinder is divided into an energy storage cavity and a compression cavity which are mutually independent by the second movable plug, and the energy storage cavity is communicated with the oil distribution pipe; the second butt pole sets up at the compression intracavity with the axial, and the one end and the second movable plug fixed connection of second butt pole, and the other end of second butt pole runs through the sealed section of thick bamboo of second along the axial, and energy release ware sets up the one end at the sealed section of thick bamboo of second with the axial, and the drive division of energy release ware towards the outer end of second butt pole.

Preferably, the accumulator further comprises a second spring, the second spring is sleeved on the second movable plug, and two ends of the second spring abut against the second movable plug and opposite ends of the compression cavity respectively.

Preferably, the energy accumulator further comprises a sealing ring, the sealing ring is sleeved on the circumferential surface of the second movable plug, and the sealing ring is in interference fit with the inner circumferential surface of the second sealing cylinder.

Preferably, the energy release device comprises a support and an electric push rod, the support is coaxially arranged at one end, located in the compression cavity, of the second sealing barrel, the electric push rod is fixedly arranged on the support, and the end portion of an output shaft of the electric push rod coaxially faces the outer end of the second abutting rod.

Compared with the prior art, the beneficial effect of this application is:

1. according to the hydraulic buffer device, the buffer structures connected with the oil pressure and the hydraulic cylinder are arranged on the outer door frame and the inner door frame, so that the inner door frame or the fork frame can be buffered when sliding to the stroke end, namely, the hydraulic oil between the oil pump and the hydraulic cylinder is shunted through the shunt and stored in the energy accumulator, and when the inner door frame or the fork frame is reset, the energy accumulator can lead out the shunted hydraulic oil from the energy accumulator, so that the load of the oil pump is not required to be increased, the structure is stable, and the hydraulic buffer device is easy to install;

2. according to the hydraulic oil distribution device, the inner door frame or the pallet fork frame is abutted against the first abutting rod, so that the first movable plug can orderly reach the oil inlet pipe, the oil outlet pipe and the oil distribution pipe when sliding in the first sealing cylinder, and then hydraulic oil can be conveniently distributed for buffering;

3. according to the buffering device, the first spring is sleeved on the first abutting rod, so that when the inner gantry or the fork frame is reset, the limiting ring drives the first abutting rod to reset automatically under the elastic action of the first spring, and the next buffering operation is facilitated;

4. according to the oil pump control device, the pressure sensor is arranged on the connecting pipeline between the oil pump and the oil inlet pipe, so that the oil pressure of the pipeline can be detected conveniently, the oil pump can be closed in time by the controller, and high pressure in the pipe is prevented;

5. according to the hydraulic cylinder, the second movable plug is arranged on the second sealing cylinder in a sliding mode, so that hydraulic oil shunted through the oil distribution pipe can be stored in the energy storage cavity conveniently, and the hydraulic cylinder can be shut down slowly;

6. according to the buffering device, the second spring is sleeved on the second abutting rod, so that hydraulic oil needs to overcome the elastic force of the second spring to drive the second movable plug to slide in the second sealing cylinder, and the buffering process is more stable;

7. this application passes through the support with electric putter setting in the one end of the sealed section of thick bamboo of second to start electric putter and promote the second butt link, make the energy storage chamber reduce so that hydraulic oil discharges.

Drawings

FIG. 1 is a perspective view of a forklift mast with a cushioning structure according to an embodiment;

FIG. 2 is a top view of the forklift mast with a cushioning structure of the embodiment;

FIG. 3 is a front view of a forklift mast with a cushioning structure of an embodiment;

FIG. 4 is a perspective view of a cushioning structure of an embodiment from a first perspective;

FIG. 5 is a perspective view of the cushioning structure of the embodiment from a second perspective;

FIG. 6 is a front view of a cushioning structure of an embodiment;

FIG. 7 is a cross-sectional view taken in the direction D-D of FIG. 6;

FIG. 8 is an axial cross-sectional view of a flow diverter according to the first embodiment with the inlet pipe, the outlet pipe and the oil distribution pipe in communication;

FIG. 9 is an axial cross-sectional view of the flow line and the flow distribution line of the first embodiment of the flow divider in communication;

FIG. 10 is a perspective view of a first movable plug and a first butt rod of the first embodiment;

FIG. 11 is a front view of a flow diverter of the second embodiment;

FIG. 12 is a sectional view taken in the direction G-G of FIG. 11;

fig. 13 is a perspective view of a first movable plug and a first butting bar of the second embodiment;

FIG. 14 is a front view of an accumulator and a release of an embodiment;

fig. 15 is a sectional view taken in the direction H-H of fig. 14.

The reference numbers in the figures are:

1-outer gantry; 2-inner door frame; 3-the fork carriage; 4-a flow divider; 4 a-a first sealing cylinder; 4a 1-oil inlet pipe; 4a 2-flowline; 4a 3-oil separation pipe; 4a 4-limit tab; 4 b-a first movable stopper; 4b1 — first ring groove; 4b 2-oil hole; 4b 3-limit groove; 4 c-a first abutment bar; 4c 1-stop collar; 4 d-a first spring; 5-an accumulator; 5 a-a second sealing cylinder; 5 b-a second movable plug; 5b 1-second ring groove; 5 c-a second abutment bar; 5 d-a second spring; 5 e-sealing ring; 6-energy release device; 6 a-a scaffold; 6 b-an electric push rod; 7-pressure sensor.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1, 2, 3, 4 and 5:

a forklift mast with a buffering structure comprises an outer mast 1, an inner mast 2 and a fork frame 3 which are sequentially arranged in a sliding manner, a hydraulic cylinder used for driving the inner mast 2 to slide relative to the outer mast 1 and the fork frame 3 to slide relative to the inner mast 2, and an oil pump used for driving the output of the hydraulic cylinder, wherein the buffering structure comprises a flow divider 4, an energy accumulator 5 and an energy releaser 6, the flow divider 4 is arranged at the top ends of the outer mast 1 and the inner mast 2, the flow divider 4 comprises a triggering part, the triggering part projects to the top end of the inner mast 2 or the fork frame 3 along the output direction of the hydraulic cylinder, the flow divider 4 further comprises an oil inlet, an oil outlet and an oil distributing port, the oil inlet is communicated with an oil conveying end of the oil pump, the oil outlet is communicated with a communicating port of the hydraulic cylinder, and the oil inlet is communicated with the oil outlet under the no external force action of the triggering part; under the continuous action of external force, the state that the oil inlet is communicated with the oil outlet is firstly converted into the state that the oil inlet, the oil outlet and the oil distributing opening are communicated, and then the state that the oil outlet is communicated with the oil distributing opening is converted into the state that the oil outlet is communicated with the oil distributing opening; the energy accumulator 5 comprises an energy storage part, the energy storage part is communicated with the oil distributing opening and is used for storing hydraulic oil when the oil inlet, the oil outlet and the oil distributing opening are communicated with each other, and the energy accumulator 5 further comprises a conduction part which can move relative to the outside in an energy storage state; the energy release device 6 is arranged on one side of the energy accumulator 5, the energy release device 6 comprises a driving part capable of triggering the reset of the conduction part, and the energy release device 6 is used for releasing hydraulic oil in the energy accumulator 5 by the driving part when the oil outlet part is communicated with the oil distribution part.

Based on the above embodiment, the device further comprises a controller, and the oil pump and the energy releaser 6 are both electrically connected with the controller;

the oil pump is started to convey hydraulic oil to the hydraulic cylinder, so that the hydraulic cylinder can drive the inner gantry 2 to move on the outer gantry 1 or the fork frame 3 to slide on the inner gantry 2, and the flow divider 4 is arranged at the top ends of the outer gantry 1 and the inner gantry 2, namely when the top end of the inner gantry 2 or the fork frame 3 is not abutted against the trigger part, only the oil inlet is communicated with the oil outlet, so that the oil pump can drive the hydraulic cylinder to work through the flow divider 4 at full flow;

when the top end of the inner gantry 2 or the fork frame 3 abuts against the trigger part, the controller closes the oil pump, and due to the inertia effect, the oil pump still pumps out a part of hydraulic oil, so that the hydraulic cylinder still outputs work, and further the inner gantry 2 or the fork frame 3 continues to abut against the trigger part, so that the flow divider 4 is firstly converted from the state that the oil inlet and the oil outlet are communicated with each other to the state that the oil inlet, the oil outlet and the oil distributing port are communicated with each other and then to the state that the oil outlet and the oil distributing port are communicated with each other;

when the oil inlet is communicated with the oil outlet and the oil distributing opening, half of hydraulic oil pumped out by the oil pump when the oil pump is stopped drives the hydraulic cylinder to continue working through the flow divider 4, and the other half of the hydraulic oil flows into the energy storage part of the energy accumulator 5 through the oil distributing opening, so that the energy storage part stores the hydraulic oil, and the conducting part of the energy accumulator 5 moves relative to the outside, thereby achieving the buffer effect on the inner gantry 2 or the fork frame 3;

until the flow divider 4 is only communicated with the oil outlet and the oil dividing port, hydraulic oil pumped out by the oil pump due to inertia cannot flow into the oil outlet and the oil dividing port through the oil inlet;

when the hydraulic oil stored in the energy accumulator 5 reaches a certain value, the controller controls the driving part of the energy releaser 6 to do work on the conduction part of the energy accumulator 5 because the oil pressure of the energy storage part, the oil pressure of the oil outlet and the oil pressure in the hydraulic cylinder are balanced, so that the hydraulic oil in the energy storage part can be discharged to the oil outlet through the oil outlet, the hydraulic oil can continuously drive the hydraulic cylinder to output a distance and then stop, and the buffer effect between the outer gantry 1 and the inner gantry 2 or between the inner gantry 2 and the fork frame 3 is achieved;

and when the inner gantry 2 or the fork frame 3 is separated from the abutting triggering part, the flow divider 4 is firstly switched from the state that the oil outlet is communicated with the oil distributing port to the state that the oil inlet is communicated with the oil outlet and the oil distributing port is communicated with each other, and then is switched to the state that the oil inlet is communicated with the oil outlet, so that the aim of continuous buffering can be fulfilled.

Further, as a first embodiment of the present application, in order to solve the problem of how to selectively communicate the oil inlet, the oil outlet and the oil distribution port when the top end of the inner mast 2 or the fork carriage 3 abuts against the trigger portion, as shown in fig. 6, 7, 8, 9 and 10:

the flow divider 4 comprises a first sealing cylinder 4a, a first movable plug 4b and a first butting rod 4c, the first sealing cylinder 4a is arranged at the top end of the outer portal frame 1 or the inner portal frame 2 along the vertical direction, the first sealing cylinder 4a is projected at the top end of the inner portal frame 2 or the fork frame 3 along the output direction of the hydraulic cylinder, an oil inlet pipe 4a1, an oil outlet pipe 4a2 and an oil distribution pipe 4a3 which extend along the radial direction of the first sealing cylinder are sequentially arranged on the circumferential surface of the first sealing cylinder 4a from bottom to top, the oil inlet pipe 4a1 is communicated with the oil delivery end of the oil pump, the oil outlet pipe 4a2 is communicated with a through hole of the hydraulic cylinder, and the oil distribution pipe 4a3 is communicated with the energy storage part of the energy accumulator 5; the first movable plug 4b is coaxially and slidably arranged in the first sealing cylinder 4a, the inner cavity of the first sealing cylinder 4a is divided into an upper cavity and a lower cavity which are independent of each other by the first movable plug 4b, a first annular groove 4b1 which is coaxial with the first movable plug 4b is arranged on the circumferential surface of the first movable plug 4b, and when the first movable plug 4b abuts against the bottom end of the inner cavity of the first sealing cylinder 4a, the oil inlet pipe 4a1, the first annular groove 4b1 and the oil outlet pipe 4a2 are communicated; when the oil distribution pipe 4a3, the first annular groove 4b1 and the oil outlet pipe 4a2 are communicated, the first movable plug 4b seals the oil inlet pipe 4a 1; the first abutting rod 4c is coaxially and fixedly arranged at the bottom end of the first movable plug 4b, and the first abutting rod 4c axially penetrates through the bottom end of the first sealing cylinder 4 a.

Based on the above embodiment, when the top end of the inner gantry 2 or the fork carriage 3 has no abutting acting force on the bottom end of the first movable plug 4b, the first movable plug 4b abuts on the bottom end of the inner cavity of the first sealing cylinder 4a, so that the oil inlet pipe 4a1, the oil outlet pipe 4a2 and the first annular groove 4b1 are communicated, and the oil pump can drive the hydraulic pump to work at full flow;

when the top end of the inner door frame 2 or the fork arm carrier 3 abuts against the bottom end of the first movable plug 4b, so that the first movable plug 4b moves in the first sealing cylinder 4a along the sliding direction of the inner door frame 2 or the fork arm carrier 3, the pressure of the upper cavity is reduced, the pressure of the upper cavity is increased until the oil inlet pipe 4a1, the oil outlet pipe 4a2, the oil distribution pipe 4a3 and the first annular groove 4b1 are communicated with each other, the oil pump stops working at the same time, and half of hydraulic oil pumped out by the oil pump due to inertia flows into an energy storage cavity of the energy accumulator 5 through the oil distribution pipe 4a3, so that the hydraulic cylinder slows down the output speed and continues outputting;

then until the oil inlet pipe 4a1 is blocked by the first movable plug 4b, and the oil outlet pipe 4a2, the first annular groove 4b1 and the oil distribution pipe 4a3 are communicated, so that the hydraulic oil pumped out by inertia cannot continuously flow into the oil outlet pipe 4a2, the oil distribution pipe 4a3 and the first annular groove 4b1, and the hydraulic cylinder is stopped slowly;

and when the inner gantry 2 or the fork carrier 3 is reset, namely the bottom end of the first movable plug 4b has no abutting acting force, the pressure in the upper cavity is greater than that in the lower cavity, so that the first movable plug 4b is reset under the action of the pressure in the upper cavity, and continuous buffering is facilitated.

Further, as the second embodiment of the present application, in order to solve the problem of how to selectively communicate the oil inlet, the oil outlet and the oil distribution port when the top end of the inner mast 2 or the fork carriage 3 abuts against the trigger portion, as shown in fig. 11, 12 and 13:

the flow divider 4 comprises a first sealing cylinder 4a, a first movable plug 4b and a first butting rod 4c, wherein the first sealing cylinder 4a is arranged at the top end of the outer portal frame 1 or the inner portal frame 2 along the vertical direction, the first sealing cylinder 4a is projected at the top end of the inner portal frame 2 or the fork frame 3 along the output direction of the hydraulic cylinder, an oil inlet pipe 4a1, an oil outlet pipe 4a2 and an oil distribution pipe 4a3 which extend along the radial direction of the first sealing cylinder are sequentially arranged on the circumferential surface of the first sealing cylinder 4a from bottom to top, the oil inlet pipe 4a1 is communicated with the oil delivery end of the oil pump, the oil outlet pipe 4a2 is communicated with a through hole of the hydraulic cylinder, the oil distribution pipe 4a3 is communicated with the energy storage part of the energy accumulator 5, and the oil inlet pipe 4a1, the oil outlet pipe 4a2 and the oil distribution pipe 4a3 are positioned on the same radial vertical surface of the first sealing cylinder 4 a; the first movable plug 4b is coaxially and slidably arranged in the first sealing cylinder 4a, the inner cavity of the first sealing cylinder 4a is divided into an upper cavity and a lower cavity which are independent of each other by the first movable plug 4b, an oil hole 4b2 penetrating along the radial direction of the first movable plug 4b is arranged on the first movable plug 4b, and when the first movable plug 4b abuts against the bottom end of the inner cavity of the first sealing cylinder 4a, the oil inlet pipe 4a1, the oil hole 4b2 and the oil outlet pipe 4a2 are communicated; when the oil distribution pipe 4a3, the oil hole 4b2 and the oil outlet pipe 4a2 are communicated, the first movable plug 4b blocks the oil inlet pipe 4a 1; the first abutting rod 4c is coaxially and fixedly arranged at the bottom end of the first movable plug 4b, and the first abutting rod 4c axially penetrates through the bottom end of the first sealing cylinder 4 a.

Based on the above embodiment, when the top end of the inner gantry 2 or the fork carriage 3 has no abutting acting force on the bottom end of the first movable plug 4b, the first movable plug 4b abuts on the bottom end of the inner cavity of the first sealing cylinder 4a, so that the oil inlet pipe 4a1, the oil outlet pipe 4a2 and the first annular groove 4b1 are communicated, and the oil pump can drive the hydraulic pump to work at full flow;

when the top end of the inner gantry 2 or the fork carriage 3 abuts against the bottom end of the first movable plug 4b, so that the first movable plug 4b moves in the first sealing cylinder 4a along the sliding direction of the inner gantry 2 or the fork carriage 3, the pressure of the upper chamber is reduced, the pressure of the upper chamber is increased until the oil inlet pipe 4a1, the oil outlet pipe 4a2, the oil distribution pipe 4a3 and the oil hole 4b2 are communicated with each other, the oil pump stops working, and half of hydraulic oil pumped out by the oil pump due to inertia flows into an energy storage cavity of the energy accumulator 5 through the oil distribution pipe 4a3, so that the hydraulic cylinder slows down the output speed and continues outputting;

then, the oil inlet pipe 4a1 is blocked by the first movable plug 4b, and the oil outlet pipe 4a2, the oil hole 4b2 and the oil distribution pipe 4a3 are communicated, so that the hydraulic oil pumped out by inertia cannot continuously flow into the oil outlet pipe 4a2, the oil distribution pipe 4a3 and the oil hole 4b2, and the hydraulic cylinder is stopped slowly;

and when the inner gantry 2 or the fork carrier 3 is reset, namely the bottom end of the first movable plug 4b has no abutting acting force, the pressure in the upper cavity is greater than that in the lower cavity, so that the first movable plug 4b is reset under the action of the pressure in the upper cavity, and continuous buffering is facilitated.

Further, in the second embodiment provided by the present application, the first movable plug 4b slides in the first sealing cylinder 4a, and still has the defect that the first movable plug 4b is easy to coaxially rotate in the first sealing cylinder 4a, and in order to solve this problem, as shown in fig. 12 and 13:

the inner circumference of the first sealing cylinder 4a is uniformly provided with an oil inlet pipe 4a1 extending along the axial direction thereof, the circumferential surface of the first movable plug 4b is uniformly provided with a limiting groove 4b3 extending along the radial direction thereof, and the limiting groove 4b3 is in sliding fit with the oil inlet pipe 4a1 along the axial direction.

Based on the above embodiment, the limiting groove 4b3 on the circumferential surface of the first movable plug 4b is axially slidably engaged with the limiting convex strip 4a4, so that the first movable plug 4b is not easy to rotate in the first sealing cylinder 4a, and the oil hole 4b2 is convenient to selectively communicate with the oil inlet pipe 4a1, the oil outlet pipe 4a2 and the oil distribution pipe 4a 3.

Further, the first movable plug 4b provided by the present application still has a defect that after the buffering is finished, the first movable plug 4b cannot be stably reset to the bottom end of the inner cavity of the first sealing cylinder 4a after the first movable plug 4b slides in the first sealing cylinder 4a, and in order to solve this problem, as shown in fig. 7 and 12:

the shunt 4 further comprises a first spring 4d, the bottom end of the circumferential surface of the first abutting rod 4c is coaxially provided with a limiting ring 4c1, the first spring 4d is sleeved on the first abutting rod 4c, and two ends of the first spring 4d abut against the bottom end of the first sealing barrel 4a and the top end of the limiting ring 4c1 respectively.

Based on the above embodiment, the bottom end of the circumferential surface of the first abutting rod 4c is provided with the limiting ring 4c1, so that the first spring 4d can be sleeved on the first abutting rod 4c and cannot fall off, and when the bottom end of the first spring 4d is subjected to abutting force, the first abutting rod 4c needs to overcome the elastic force of the first spring 4d to move upwards, and further when the inner gantry 2 or the fork carriage 3 is reset, the first abutting rod 4c is reset due to the elastic force of the first spring 4d, so that continuous buffering is performed on the sliding inner gantry 2 or the fork carriage 3.

Further, when the first movable plug 4b slides in the axial direction to block the oil inlet pipe 4a1, the oil pressure of the oil inlet pipe 4a1 and the oil pump connecting section increases rapidly, if the oil pump is not in time, the connecting end pipe is deformed by high pressure, and in order to solve the problem, as shown in fig. 7:

the oil pump further comprises a pressure sensor 7, and the pressure sensor 7 is arranged on a connecting pipeline between the oil conveying end of the oil pump and the oil inlet pipe 4a 1.

Based on above-mentioned embodiment, oil pump and pressure sensor 7 all are connected with the controller electricity, slide and then the shutoff advances the in-process of oil pipe 4a1 when first movable stopper 4b slides in first sealed section of thick bamboo 4a, the oil pressure increase of the connecting line of oil pump and oil pipe 4a1, can in time detect the oil pressure and feed back to the controller through pressure sensor 7, close the oil pump by the controller, prevent that the oil pump from continuing work and make the connecting line pressurized deformation.

Further, in order to solve the problem of how the accumulator 5 collects, as shown in fig. 14 and fig. 15:

the energy accumulator 5 comprises a second sealing cylinder 5a, a second movable plug 5b, a second abutting rod 5c and a second spring 5d, and the second sealing cylinder 5a is arranged on one side of the flow divider 4; the second movable plug 5b is coaxially and slidably arranged in the second sealing cylinder 5a, the inner cavity of the second sealing cylinder 5a is divided into an energy storage cavity and a compression cavity which are mutually independent by the second movable plug 5b, and the energy storage cavity is communicated with the oil distribution pipe 4a 3; the second abutting rod 5c is coaxially arranged in the compression cavity, one end of the second abutting rod 5c is fixedly connected with the second movable plug 5b, the other end of the second abutting rod 5c axially penetrates through the second sealing cylinder 5a, the energy release device 6 is coaxially arranged at one end of the second sealing cylinder 5a, and the driving part of the energy release device 6 faces the outer end of the second abutting rod 5 c.

Based on the above embodiment, the hydraulic oil flows into the energy storage cavity through the oil distribution pipe 4a3, and the second movable plug 5b is slidably disposed in the second sealing cylinder 5a, so that the hydraulic oil can push the second movable plug 5b to move in the second sealing cylinder 5a, and further the second movable plug 5b pushes the second abutting rod 5c to extend outward, so as to collect the hydraulic oil in the flow divider 4, and when the energy release device 6 is started, the working end thereof can push the second movable plug 5b to slide in the second sealing cylinder 5a through the second abutting rod 5c, so that the hydraulic oil in the energy storage cavity is re-discharged into the pipeline through the oil inlet pipe 4a1, and further the hydraulic oil can be collected next time.

Further, when the second movable plug 5b provided by the present application slides in the second sealing cylinder 5a, it still has the defect that it cannot stably slide and reset, and in order to solve this problem, as shown in fig. 15:

the energy accumulator 5 further comprises a second spring 5d, the second spring 5d is sleeved on the second movable plug 5b, and two ends of the second spring 5d are respectively abutted against the second movable plug 5b and the opposite end of the compression cavity.

Based on the above embodiment, the second spring 5d is sleeved on the second abutting rod 5c, so that the elastic force of the second spring 5d is overcome when the hydraulic oil enters the energy storage cavity, the oil pressure is buffered, and the buffering structure is more stable.

Further, the second movable plug 5b provided by the present application slides in the second sealing cylinder 5a to divide the inner cavity thereof into an energy storage cavity and a compression cavity, and still has a defect that hydraulic oil in the energy storage cavity easily flows into the compression cavity through a gap, in order to solve the problem, as shown in fig. 15:

the energy accumulator 5 further comprises a sealing ring 5e, the sealing ring 5e is sleeved on the circumferential surface of the second movable plug 5b, and the sealing ring 5e is in interference fit with the inner circumferential surface of the second sealing cylinder 5 a.

Based on the above embodiment, the sealing ring 5e in interference fit with the inner circumference of the second sealing cylinder 5a is sleeved on the circumferential surface of the second movable plug 5b, so that the energy storage cavity and the compression cavity are relatively closed, and hydraulic oil in the energy storage cavity is prevented from flowing into the compression cavity through a gap.

As some optional embodiments of the present application, a second ring groove 5b1 is further coaxially disposed on the circumferential surface of the second movable plug 5b, the sealing ring 5e is sleeved on the second ring groove 5b1, and the sealing ring 5e is sleeved on the second ring groove 5b1, so that when the second ring groove 5b1 slides relative to the inner circumferential surface of the second sealing cylinder 5a, the sealing ring 5e is not easy to fall off along the axis on the second movable plug 5b, thereby ensuring the sealing performance.

Further, to solve the problem of how the energy release 6 resets the second abutment bar 5c, as shown in fig. 15:

the energy releaser 6 comprises a bracket 6a and an electric push rod 6b, the bracket 6a is coaxially arranged at one end of the second sealing cylinder 5a, which is positioned in a compression cavity of the second sealing cylinder, the electric push rod 6b is fixedly arranged on the bracket 6a, and the end part of an output shaft of the electric push rod 6b coaxially faces the outer end of the second abutting rod 5 c.

Based on the above embodiment, the bracket 6a is arranged at one end of the second sealing cylinder 5a, and the electric push rod 6b and the second abutting rod 5c are coaxially arranged on the bracket 6a in a manner of being away from each other, so that the electric push rod 6b does not affect the normal sliding of the second abutting rod 5c, and the output shaft of the electric push rod 6b can push the second abutting rod 5c into the second sealing cylinder 5a by starting the electric push rod 6 b.

The above examples, which are intended to represent only one or more embodiments of the present invention, are described in greater detail and with greater particularity, and are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.