CN107055328A - Hydraulic system and the hoisting apparatus for rescue - Google Patents

Abstract

The invention discloses a hydraulic system and a lifting device for rescue. The hydraulic system includes: a telescopic oil cylinder; luffing oil; a lifting motor; a rotary motor; The hydraulic oil is provided by the width oil cylinder and the lifting motor; the first hydraulic transformer is a booster transformer, and the first hydraulic transformer has a first system interface, a first load interface and a first oil return interface; an accumulator; among them: the main system The pipeline is connected to the first system interface, and the main system pipeline is provided with a first check valve, the rodless chamber of the telescopic cylinder is connected to the first load interface, and the accumulator is connected to the first system interface, so that: when the hydraulic When the pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the rodless chamber of the telescopic cylinder through the first hydraulic transformer to extend the piston rod of the telescopic cylinder and drive the telescopic arm to extend; When the arm retracts, the hydraulic oil in the rodless chamber of the telescopic oil cylinder enters the accumulator through the first hydraulic transformer.

Description

Hydraulic system and lifting gear for rescue

technical field

The invention relates to the technical field of engineering vehicles, in particular to a hydraulic system and a lifting device for rescue.

Background technique

Lifting vehicles, such as lifting vehicles used for rescue, usually include a lifting device, which generally consists of a telescopic arm, a hoist, and a turntable. The telescopic arm is arranged on the turntable, and the rotation of the turntable makes The telescopic arm rotates so that the heavy object can be hoisted from one position to another. The telescopic arm can be stretched and stretched to change the length through the drive of the telescopic oil cylinder, so as to meet the adjustment of the lifting height of the heavy object. The angle between the telescopic arm and the ground can also be controlled, so that the position and height of the heavy object can also be changed. The winch is driven by the hoisting motor to rotate, so that the sling moves to lift the heavy object or make the heavy object fall.

The hydraulic system used to drive and control the lifting device in the prior art has the following two disadvantages:

1. The pressure of the hydraulic oil provided by the hydraulic pump used to supply oil to the oil cylinder and motor is not stable enough, which makes the system pressure unstable and insufficient, resulting in the expansion and contraction of the oil cylinder and the unstable rotation speed and torque of the motor.

2, the expansion and contraction of the oil cylinder, the two-way rotation of the motor, the hydraulic oil (this hydraulic oil also has a certain pressure and stores a certain capacity) at the pressure relief port is directly returned to the oil tank, thereby causing a waste of energy. For example, when the telescopic arm is retracted, the height of the arm tube of the telescopic arm is continuously reduced, and its gravitational potential energy is converted into kinetic energy to make the piston rod of the telescopic cylinder retract naturally, so that the gravitational potential energy of the arm tube is converted into the pressure potential energy of the hydraulic oil Or kinetic energy, and this part of energy is wasted due to the direct return of hydraulic oil to the oil tank.

Contents of the invention

Aiming at the above-mentioned technical problems existing in the prior art, the implementation of the present invention provides a hydraulic system and a lifting device for rescue.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A hydraulic system for a lifting device, the lifting device includes a telescopic arm, a winch and a turntable, the hydraulic system includes:

a telescopic oil cylinder, which is used to drive the telescopic arm to make the telescopic arm telescopic;

luffing oil cylinder, which is used to drive the telescopic arm to change the angle of the telescopic arm relative to the ground;

a hoisting motor, which is used to drive the winch to rotate;

a rotary motor, which is used to drive the rotary table to rotate;

A hydraulic pump, which provides hydraulic oil for the telescopic oil cylinder, the luffing oil cylinder, and the lifting motor through the main system pipeline;

A first hydraulic transformer, which is a booster transformer, and the first hydraulic transformer has a first system interface, a first load interface, and a first oil return interface;

Accumulators; of which:

The main system pipeline is connected to the first system interface, and a first check valve is arranged on the main system pipeline, the rodless chamber of the telescopic oil cylinder is connected to the first load interface, and the accumulator The enabler is interfaced with the first system such that:

When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the rodless cavity of the telescopic oil cylinder through the first hydraulic transformer to make the telescopic oil cylinder The piston rod of the telescopic cylinder is extended to drive the telescopic arm to extend; when the telescopic arm retracts, the hydraulic oil in the rodless cavity of the telescopic cylinder enters the accumulator through the first hydraulic transformer.

Preferably, the rodless chamber of the luffing cylinder is connected to the first load interface, and the accumulator is connected to the first system interface, so that:

When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the rodless chamber of the luffing cylinder through the first hydraulic transformer to make the luffing cylinder The piston rod of the luffing cylinder is extended to drive the luffing cylinder to extend; when the luffing cylinder retracts, the hydraulic oil in the rodless chamber of the luffing cylinder enters the luffing cylinder through the first hydraulic transformer Accumulator.

Preferably, the hydraulic system further includes a second hydraulic transformer, the second hydraulic transformer is a booster transformer, and the second hydraulic transformer has a second system interface, a second load interface and a second oil return interface;

The main system pipeline is connected to the second system interface, the first working interfaces of the hoisting motor and the slewing motor are both connected to the second load interface, and the hoisting motor and the slewing motor The second working interfaces are all connected to the second system interface, and the accumulator is connected to the second system interface, so that:

When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open and enters the first working interface of the lifting motor through the second hydraulic transformer. The lift motor rotates in its first direction, and the hydraulic oil flowing out from the second working interface of the lift motor enters the accumulator; and when the lift motor needs to face in the first direction with the lift motor said accumulator powers said hoist motor during rotation in a second, opposite direction; and

When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the first working interface of the swing motor through the second hydraulic transformer, and the swing motor Rotating in its first direction, the hydraulic oil flowing out from the second working interface of the swing motor enters the accumulator; and when the swing motor needs to turn in a second direction opposite to the first direction of the swing motor When turning, the accumulator powers the swing motor.

The invention also discloses a lifting device for rescue, which includes the above-mentioned hydraulic system.

Compared with the prior art, the beneficial effect of the hydraulic system and the lifting device of the present invention is that the hydraulic transformer and the accumulator in the hydraulic system of the present invention not only make the lifting device move smoothly, but also save energy.

Description of drawings

Fig. 1 is a schematic structural diagram of a hydraulic system provided by an embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG. 1 .

In the picture:

10-engine; 20-hydraulic pump; 21-main system pipeline; 30-first hydraulic transformer; 31-first system interface; 32-first load interface; 33-first oil return interface; 40-second hydraulic pressure Transformer; 41-second system interface; 42-second load interface; 43-second oil return interface; 50-telescopic oil cylinder; 60-luffing oil cylinder; 70-rotary motor; 80-lifting motor; 90-energy storage 100-switch valve; 110-oil outlet branch; 120-oil inlet branch; 200-reducing cylinder; 201-big diameter piston; 202-first large diameter chamber; Chamber; 204-the first large-diameter interface; 205-the second large-diameter interface; 206-the small-diameter piston; 207-the first small-diameter chamber; 208-the second small-diameter chamber; 209-the first small-diameter inlet; 210-the first Small-diameter outlet; 211-second small-diameter inlet; 212-second small-diameter outlet; 213-two-position four-way reversing valve; 214-first control rod; 215-second control rod; 216-connecting rod; 217-circulation pipe Road; 218-two-position three-way reversing valve.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Fig. 1, the embodiment of the present invention discloses a hydraulic system, which is applied to a lifting device, and the lifting device includes a telescopic arm, a winch and a turntable, and the telescopic arm is arranged on the turntable to follow The turntable rotates, the hoist is arranged on the telescopic arm, and the hoist winds the sling to lift or drop the heavy object. The hydraulic system of the present invention includes telescopic oil cylinder 50, which is used to drive the telescopic arm to make the telescopic arm telescopic; luffing oil cylinder 60, which is used to drive the telescopic arm to change the angle of the telescopic arm relative to the ground; lifting motor 80, which is used to to drive the winch to rotate; the rotary motor 70 is used to drive the rotary table to rotate; the hydraulic pump 20 is driven by the engine 10 and provides telescopic oil cylinder 50, luffing oil cylinder 60 and lifting motor 80 through the main system pipeline 21; Hydraulic oil; the first hydraulic transformer 30, which is a booster transformer, the first hydraulic transformer 30 has a first system interface 31, a first load interface 32, and a first oil return interface 33; an accumulator 90; wherein: the main system pipe The pipeline 21 is connected to the first system interface 31, and the main system pipeline 21 is provided with a first check valve, the rodless cavity of the telescopic oil cylinder 50 is connected to the first load interface 32, and the accumulator 90 is connected to the first system interface 31 Connected so that: when the hydraulic pump 20 supplies oil to the main system pipeline 21, the hydraulic oil makes the first one-way valve open, and enters the rodless cavity of the telescopic oil cylinder 50 through the first hydraulic transformer 30 to make the piston of the telescopic oil cylinder 50 The rod stretches out to drive the telescopic arm to extend; when the telescopic arm retracts, the hydraulic oil in the rodless chamber of the telescopic oil cylinder 50 enters the accumulator 90 through the first hydraulic transformer 30 .

In a preferred embodiment of the present invention, the rodless chamber of the luffing cylinder 60 is connected to the first load interface 32, and the accumulator 90 is connected to the first system interface 31, so that: when the hydraulic pump 20 is the main system pipeline 21 When supplying oil, the hydraulic oil makes the first one-way valve open, and enters the rodless chamber of the luffing cylinder 60 through the first hydraulic transformer 30 to extend the piston rod of the luffing cylinder 60, driving the luffing cylinder 60 to extend; When the luffing cylinder 60 retracts, the hydraulic oil in the rodless cavity of the luffing cylinder 60 enters the accumulator 90 through the first hydraulic transformer 30 .

In a preferred embodiment of the present invention, the hydraulic system further includes a second hydraulic transformer 40, the second hydraulic transformer 40 is a booster transformer, and the second hydraulic transformer 40 has a second system interface 41, a second load interface 42 and a second The oil return interface 43; the main system pipeline 21 is connected to the second system interface 41, the first working interface of the lifting motor 80 and the swing motor 70 are connected to the second load interface 42, the first working interface of the lifting motor 80 and the swing motor 70 Both working interfaces are connected to the second system interface 41, and the accumulator 90 is connected to the second system interface 41, so that: when the hydraulic pump 20 supplies oil to the main system pipeline 21, the hydraulic oil makes the first one-way valve open, And enter the first working interface of the lifting motor 80 through the second hydraulic transformer 40, the lifting motor 80 rotates toward its first direction, and the hydraulic oil flowing out from the second working interface of the lifting motor 80 enters the accumulator 90; and When the hoist motor 80 needs to rotate in a second direction opposite to the first direction of the hoist motor 80, the accumulator 90 provides power for the hoist motor 80; and when the hydraulic pump 20 supplies oil to the main system pipeline 21 , the hydraulic oil makes the first one-way valve open, and enters the first working interface of the swing motor 70 through the second hydraulic transformer 40, the swing motor 70 rotates in its first direction, and the hydraulic oil flowing out of the second working interface of the swing motor 70 into the accumulator 90 ; and the accumulator 90 powers the swing motor 70 when the swing motor 70 needs to rotate in a second direction opposite to the first direction of the swing motor 70 .

It should be explained that: the control valves (two-position two-way electromagnetic reversing in the accompanying drawings) that control the above-mentioned telescopic oil cylinder 50, luffing oil cylinder 60, lifting motor 80, and swing motor 70 are different from the control valves in the prior art. Same, no more details here.

The working process of the hydraulic system of the present invention will be described below by introducing the action of the lifting device, and thereby the advantages of the hydraulic system of the present invention will be described.

The telescopic action of the telescopic arm

Extension of the telescopic arm: the extension of the piston rod of the telescopic oil cylinder 50 drives the extension of the arm cylinder in the telescopic arm. In this action, the hydraulic oil provided by the hydraulic pump 20 passes through the first hydraulic transformer 30, the pressure increases, and then enters the The rodless chamber of the telescopic oil cylinder 50 pushes against the piston rod and stretches out, so that the arm barrel is stretched out; in this process, the hydraulic pump 20 in the prior art is directly connected with the rodless chamber of the telescopic oil cylinder 50, and the hydraulic pump 20 The pressure provided is not stable enough, so that the extension speed and force of the piston rod of the telescopic oil cylinder 50 are not stable enough, thereby causing the arm cylinder to vibrate during the extension process; The load interface 32 can provide high-pressure and stable hydraulic oil, so that the extension speed and force of the telescopic oil cylinder 50 are relatively stable, thereby preventing shaking during the extension process of the arm barrel.

Retraction of the telescopic arm: when the arm barrel retracts, the arm barrel retracts using the gravity of the arm barrel and the weight itself, and the hydraulic pump 20 stops. At this time, the hydraulic oil in the rodless chamber in the telescopic oil cylinder 50 starts A load interface 32 enters the first hydraulic transformer 30, and then flows out from the first system interface 31 of the first hydraulic transformer 30. Due to the reverse check effect of the first check valve, the hydraulic oil enters the accumulator 90 (for the accumulator The accumulator 90 is filled with liquid), so that the energy storage of the accumulator 90 is increased, and the energy stored in the accumulator 90 can be used as a power source in combination with the hydraulic pump 20.

The luffing action of the telescopic arm:

Lifting of the telescopic arm (increasing the angle with the ground): In this action, the hydraulic oil provided by the hydraulic pump 20 passes through the first hydraulic transformer 30, the pressure increases, and then enters the rodless cavity of the luffing cylinder 60, thereby pushing The piston rod is stretched out to increase the angle between the telescopic arm and the ground. During this process, the hydraulic pump 20 in the prior art is directly connected to the rodless chamber of the luffing cylinder 60. The pressure provided by the hydraulic pump 20 is not stable enough. Instead, the extension speed and force of the piston rod of the luffing oil cylinder 60 are not stable enough, thereby causing the telescopic arm to vibrate during the lifting process; and the hydraulic system of the present invention is capable of High pressure and stable hydraulic oil is provided, so that the extension speed and force of the luffing oil cylinder 60 are relatively stable, thereby preventing the shaking of the telescopic arm during lifting.

The bending of the telescopic arm (increasing the angle with the ground): In this action, the telescopic arm leans over (decreases the angle with the ground) by utilizing the gravity of the telescopic arm and the weight itself. At this time, the luffing cylinder 60 The hydraulic oil in the rodless cavity enters the first hydraulic transformer 30 from the first load port 32, and then flows out from the first system port 31 of the first hydraulic transformer 30. Due to the reverse check effect of the first one-way valve, the hydraulic oil The oil enters the accumulator 90 to increase the energy stored in the accumulator 90 , and the energy stored in the accumulator 90 can be used as a power source in conjunction with the hydraulic pump 20 .

Winding rotation:

When hoisting and winding the suspension rope: the hydraulic oil provided by the hydraulic pump 20 passes through the second hydraulic transformer 40, the pressure increases, and then enters the hoisting motor 80 through the first working interface of the hoisting motor 80, and then the hydraulic oil from the hoisting motor 80 The second working interface of the motor 80 flows out, and the outflowing hydraulic oil enters the second hydraulic transformer 40 through the second system interface 41 again. During this process, the hydraulic pump 20 in the prior art is directly connected to the first working interface of the lifting motor 80, and the second working interface of the lifting motor 80 is directly connected to the oil tank; on the one hand, the hydraulic pump 20 provides The pressure is not stable enough, but the rotation speed and torque of the lifting motor 80 are not stable enough, which causes the suspension rope to be unstable when lifting heavy objects, and even causes decoupling; The hydraulic oil (the hydraulic oil has a certain pressure and stores a certain energy) directly returns to the oil tank, thereby wasting energy; and the hydraulic system of the present invention can provide higher and stable hydraulic pressure due to the second load interface 42 of the second hydraulic transformer 40. Oil, so that the rotation speed and twist of the lifting motor 80 are relatively stable, thereby preventing the shaking of the heavy object during the lifting process, and the hydraulic oil flowing out from the second working interface of the lifting motor 80 (the hydraulic oil has a certain pressure) , to store a certain amount of energy) enters the second hydraulic transformer 40 again, so as to participate in driving the hoisting motor 80 again, so that the energy can be reused.

When it is necessary to drop a heavy object, due to gravity, the heavy object reverses the winch through the sling, thereby driving the hoisting motor 80 to reverse, and the reversed hoisting motor 80 makes the hydraulic oil work from the second part of the hoisting motor 80. The interface enters and flows out from the first working interface, and the outflow hydraulic oil enters the second hydraulic transformer 40 from the second load interface 42 of the second hydraulic transformer 40, and then flows out from the second system interface 41, and the outflow hydraulic oil enters the accumulator 90, and then store the energy for subsequent power use (for example, as a power source like the hydraulic pump 20, or jointly used with the hydraulic pump 20).

During the rotation of the turntable, the action of the turn motor 70 driving the turntable to rotate, the role played by the second hydraulic transformer 40 is the same as that in the process of driving the hoisting motor 80, and will not be repeated here.

Preferably, the transformation ratio of the first hydraulic transformer 30 is adjustable, and the adjustment range is 1.5-2.5.

Preferably, the transformation ratio of the second hydraulic transformer 40 is adjustable, and the adjustment range is 1.5-2.5.

According to the above, it can be seen that the hydraulic transformer and the accumulator 90 in the hydraulic system of the present invention not only make the movement of the lifting device stable, but also save energy.

In fact, when the telescopic arm retracts, the weight falls and the telescopic arm leans over, the telescopic arm and the heavy load on the telescopic cylinder 50, the luffing cylinder 60 and the lifting motor 80 are far less than the telescopic arm. During the lifting process of the heavy object and the lifting process of the telescopic arm, that is to say, for example, when the telescopic arm is retracted, the pressure of the hydraulic oil in the rodless cavity of the telescopic cylinder 50 is less than that of the telescopic arm extended The pressure of the hydraulic oil in the rodless cavity of the telescopic oil cylinder 50 is lower than that provided by the hydraulic pump 20. pressure. The above situation also exists in other actions of the lifting device. In this way, the returned hydraulic oil cannot be quickly stored in the accumulator 90 due to its low pressure, which in turn affects the retraction action of the telescopic oil cylinder 50, thereby affecting the movement of the telescopic arm. retract.

In order to solve the above problems, as shown in FIG. 2 and in conjunction with FIG. 1 , the hydraulic system of the present invention further includes a pressure adjustment mechanism. The pressure adjustment mechanism includes a variable-diameter cylinder 200, which forms two chambers with different cross-sections and not connected to each other, that is, a large-diameter chamber and a small-diameter chamber; a large-diameter piston 201 is arranged in the large-diameter chamber , the large-diameter piston 201 divides the large-diameter chamber into a first large-diameter chamber 202 and a second large-diameter chamber 203, and the small-diameter piston 206 divides the small-diameter chamber into a first small-diameter chamber 207 and a second small-diameter chamber chamber 208, the small diameter piston 206 and the large diameter piston 201 are connected by a connecting rod 216, and the variable diameter cylinder 200 between the large diameter chamber and the small diameter chamber is also provided with a two-position four-way reversing valve. A first control rod 214 and a second control rod 215 are respectively provided at both ends of the position four-way reversing valve, and the first control rod 214 and the second control rod 215 extend into the second large-diameter chamber 203 and the first control rod 203 respectively. In the small diameter chamber 207.

Wherein, the first small-diameter chamber 207 is provided with a first small-diameter inlet 209 and a first small-diameter outlet 210, and the second small-diameter chamber 208 is provided with a second small-diameter inlet 211 and a second small-diameter outlet 212; the first large-diameter chamber 202 is provided with a first large-diameter interface 204 , and the second large-diameter chamber 203 is provided with a second large-diameter interface 205 .

An on-off valve 100 is arranged on the liquid-filling pipeline connected to the accumulator 90, and an oil outlet branch 110 and an oil-inlet branch 120 respectively lead out from the liquid-fill pipeline on both sides of the on-off valve 100, and the oil outlet branch 110 Divide into three branches again and communicate with the oil inlet of the first small diameter inlet 209, the second small diameter inlet 211 and the two-position four-way reversing valve 213 respectively, and the oil inlet branch 120 is connected with the first small diameter outlet 210 and the second small diameter respectively. The outlet 212 is connected, and the two working ports of the two-position four-way reversing valve 213 are respectively connected with the first large-diameter interface 204 and the second large-diameter interface 205 .

In this way, when the telescopic arm is retracted and the pressure of the hydraulic oil in the liquid-filled pipeline for charging the accumulator 90 is small, the on-off valve 100 is closed to allow the hydraulic oil to enter the oil outlet branch 110 and pass through the first small-diameter inlet. 209 and the second small-diameter inlet 211 enter the first small-diameter chamber 207 and the second small-diameter chamber 208, and at the same time, the hydraulic oil enters the first large-diameter chamber 202 and the second large-diameter chamber through the two-position four-way reversing valve 213 If one of 203 enters the first large-diameter chamber 202, the hydraulic oil pushes the large-diameter piston 201 to move to the right, the pressure of the hydraulic oil in the second small-diameter chamber 208 increases, and the hydraulic oil in the second small-diameter chamber 208 passes through The oil inlet branch 120 fills the accumulator 90 with liquid; when the large-diameter piston 201 moves to the rightmost end, the first control rod 214 is triggered, and the two-position four-way reversing valve 213 is reversed, so that the oil in the oil outlet branch 110 The hydraulic oil enters the second large-diameter chamber 203 through the two-position four-way reversing valve 213, and the hydraulic oil in the second large-diameter chamber 203 pushes the large-diameter piston 201 to move left, so that the hydraulic oil in the first small-diameter chamber 207 increase, the hydraulic oil in the first small-diameter chamber 207 fills the accumulator 90 through the oil inlet branch 120, and when the small-diameter piston 206 moves to the leftmost end, the small-diameter piston 206 triggers the second control rod 215, and the oil outlet branch The road 110 enters the first large-diameter chamber 202 again through the two-position four-way reversing valve 213, and then the above-mentioned actions are repeated.

The above-mentioned pressure adjustment mechanism drives the reciprocating motion of the large-diameter piston 201 to increase the hydraulic oil in the small-diameter chamber and continuously fill the accumulator 90 , thereby increasing the pressure of the hydraulic oil filling the accumulator 90 .

The pressure regulating mechanism of the present invention actually increases the pressure of the hydraulic oil through the reciprocating motion of the two pistons in the variable diameter cylinder 200 .

To prevent that when the large-diameter piston 201 moves to the right, the hydraulic oil in the second large-diameter chamber 203 directly returns to the oil tank to waste energy, or in order to prevent that when the large-diameter piston 201 moves to the left, the hydraulic oil in the first large-diameter chamber 202 The hydraulic oil directly returns to the oil tank to waste energy. The oil return port of the two-position four-way reversing valve 213 is connected to the oil inlet of the two-position three-way reversing valve 218 through the circulation pipeline 217. The first large-diameter chamber 202 is connected to the second The two large-diameter chambers 203 are connected to the two working ports of the two-position three-way reversing ring, so that when the large-diameter piston 201 moves to the right, the two-position three-way reversing valve 218 is controlled so that the second large-diameter chamber 203 The hydraulic oil inside enters the first large-diameter chamber 202 through the two-position four-way reversing valve 213 and the two-position three-way reversing valve 218, and participates in pushing the large-diameter piston 201 to move to the right as supplementary hydraulic oil; when the large-diameter piston 201 When moving to the left, control the two-position three-way reversing valve 218 so that the hydraulic oil in the first large-diameter chamber 202 enters the second large-diameter chamber through the two-position four-way reversing valve 213 and the two-position three-way reversing valve 218 In the chamber 203, as supplementary hydraulic oil, it participates in pushing the large-diameter piston 201 to move to the left.

The pressure adjusting mechanism of the present invention can not only increase the pressure of the hydraulic oil filling the accumulator 90, but also use the pressure energy of the hydraulic oil as the circulation power, thereby saving energy.

The invention also discloses a lifting device for rescue, which includes the above-mentioned hydraulic system.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present invention within the spirit and protection scope of the present invention, and such modifications or equivalent replacements should also be deemed to fall within the protection scope of the present invention.

Claims (4)

1. A hydraulic system is used for a lifting device, and the lifting device includes a telescopic arm, a winch and a turntable, and it is characterized in that the hydraulic system includes: a telescopic oil cylinder, which is used to drive the telescopic arm to make the telescopic arm telescopic; luffing oil cylinder, which is used to drive the telescopic arm to change the angle of the telescopic arm relative to the ground; a hoisting motor, which is used to drive the winch to rotate; a rotary motor, which is used to drive the rotary table to rotate; A hydraulic pump, which provides hydraulic oil for the telescopic oil cylinder, the luffing oil cylinder, and the lifting motor through the main system pipeline; A first hydraulic transformer, which is a booster transformer, and the first hydraulic transformer has a first system interface, a first load interface, and a first oil return interface; Accumulators; of which: The main system pipeline is connected to the first system interface, and a first check valve is arranged on the main system pipeline, the rodless chamber of the telescopic oil cylinder is connected to the first load interface, and the accumulator The enabler is interfaced with the first system such that: When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the rodless cavity of the telescopic oil cylinder through the first hydraulic transformer to make the telescopic oil cylinder The piston rod of the telescopic cylinder is extended to drive the telescopic arm to extend; when the telescopic arm retracts, the hydraulic oil in the rodless cavity of the telescopic cylinder enters the accumulator through the first hydraulic transformer. 2. The hydraulic system according to claim 1, wherein the rodless chamber of the luffing cylinder is connected to the first load interface, and the accumulator is connected to the first system interface, so that : When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the rodless chamber of the luffing cylinder through the first hydraulic transformer to make the luffing cylinder The piston rod of the luffing cylinder is extended to drive the luffing cylinder to extend; when the luffing cylinder retracts, the hydraulic oil in the rodless chamber of the luffing cylinder enters the luffing cylinder through the first hydraulic transformer Accumulator. 3. The hydraulic system according to claim 1, characterized in that, the hydraulic system also includes a second hydraulic transformer, the second hydraulic transformer is a booster transformer, and the second hydraulic transformer has a second system interface, The second load port and the second oil return port; The main system pipeline is connected to the second system interface, the first working interfaces of the hoisting motor and the slewing motor are both connected to the second load interface, and the hoisting motor and the slewing motor The second working interfaces are all connected to the second system interface, and the accumulator is connected to the second system interface, so that: When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the first working interface of the lifting motor through the second hydraulic transformer, and the lifting motor The lift motor rotates in its first direction, and the hydraulic oil flowing out from the second working interface of the lift motor enters the accumulator; and when the lift motor needs to face in the first direction with the lift motor said accumulator powers said hoist motor during rotation in a second, opposite direction; and When the hydraulic pump supplies oil to the main system pipeline, the hydraulic oil makes the first one-way valve open, and enters the first working interface of the swing motor through the second hydraulic transformer, and the swing motor Rotating in its first direction, the hydraulic oil flowing out from the second working interface of the swing motor enters the accumulator; and when the swing motor needs to turn in a second direction opposite to the first direction of the swing motor When turning, the accumulator powers the swing motor. 4. A lifting device for rescue, characterized in that the lifting device for rescue comprises the hydraulic system according to any one of claims 1-3.