CN103754736B - Dual Drive elevating mechanism - Google Patents

Abstract

The invention discloses a double-drive lifting mechanism, which includes two power-driven lifting mechanisms, a mechanical power-driven lifting mechanism and a hydraulic power-driven lifting mechanism, and the two sets of power-driven lifting mechanisms can work independently or simultaneously. The invention provides a double-drive lifting mechanism, in which any set of driving lifting mechanisms fails, and the other set of driving lifting mechanisms can immediately enter the main driving state to realize the continuous operation of the lifting mechanism. At the same time, in the double-drive lifting mechanism, when any set of driving lifting mechanism is working as the main drive, the other set of driving lifting mechanism will automatically be used as a safety protection device to protect the lifting mechanism, which improves the reliability and reliability of the lifting mechanism. safety.

Description

Double drive lifting mechanism

technical field

The invention relates to a double-drive elevating mechanism, in particular to a mechanical-hydraulic double-drive elevating mechanism, which belongs to the field of electric and electromechanical technology.

Background technique

At present, lifting mechanisms are widely used in lifting, loading, transportation and other fields. Common lifting mechanisms include cranes and elevators. It is mainly composed of lifting motor, reducer, steel cable, winch wheel and so on. Its basic working principle is: by controlling the rotation direction of the lifting motor, it drives the positive and negative rotation of the winch wheel, realizes the retraction and release of the winch wheel to the steel cable, and completes the lifting of the lifting object. But for some more important occasions, such as the lifting of important equipment, more safety and reliability need to be considered. Therefore, once the lifting mechanism fails, on the one hand, more safety measures must be taken to prevent the lifting object from falling quickly. , damage the lifting object; on the other hand, it must be able to quickly eliminate the fault, or be able to start the second set of lifting mechanism to ensure that the lifting mechanism can work normally and continuously.

For some special occasions, in order to ensure that the lifting mechanism can work normally and continuously, and to improve the reliability and safety of the lifting mechanism, the present invention hopes to provide a set of technical solutions for the lifting mechanism driven by dual power, so as to ensure the reliable operation of the lifting mechanism. provide assurance.

Contents of the invention

In order to improve the reliability and safety of the lifting mechanism, the present invention provides a double-drive lifting mechanism, which includes two power-driven lifting mechanisms, a mechanical power-driven lifting mechanism and a hydraulic power-driven lifting mechanism.

In order to achieve the above object, technical scheme of the present invention is as follows:

A double-drive lifting mechanism, which includes: a fixed frame and a lifting frame, and includes a mechanical power lifting system and a hydraulic power lifting system;

The mechanical power lifting system includes a lifting motor, a reducer, a gear, and a rack; the lifting motor has a braking device; the lifting motor is installed on a motor mounting base, and the motor mounting base is fixed on the lifting frame; The left end of the lifting motor is equipped with a reducer, the output shaft of the reducer is connected to the gear, the rotation of the lifting motor can be transmitted to the gear after being decelerated by the reducer, and the gear is driven to rotate; the rack is installed on a fixed The frame is fixed on the left column of the frame and meshes with the gear; through the rotary motion of the lifting motor installed on the lifting frame, and through the deceleration of the reducer, the driving gear rotates to realize the vertical movement of the gear in the vertical direction of the rack , to realize the lifting action of the lifting frame;

The hydraulic power lifting system includes a hydraulic system, an oil cylinder, an oil cylinder lower connector, an oil cylinder lower mounting seat, a lower pin shaft, an oil cylinder upper mounting seat, and an upper pin shaft. The oil cylinder includes an oil cylinder barrel, an oil cylinder upper end cover, a piston, and a piston rod , lower end cover; the upper mounting seat of the oil cylinder is installed on the fixed frame crossbeam of the fixed frame, and the upper end cover of the oil cylinder is hinged with the upper mounting seat of the oil cylinder through the upper pin; the lower mounting seat of the oil cylinder is installed on the lifting frame , the upper part of the lower connecting head of the oil cylinder is connected with the piston rod of the oil cylinder through threads, and the lower part of the lower connecting head of the oil cylinder is hinged with the lower mounting seat of the oil cylinder through the lower pin; the hydraulic system includes an oil tank, an oil filter, an oil pump, a balance overflow Flow valve, overflow valve, electromagnetic reversing valve, one-way valve and several pipelines; the pipelines are pipeline one, pipeline two, pipeline three, pipeline four, pipeline five, pipeline six, pipeline Road seven, pipeline eight, the oil tank and the oil filter are connected through pipeline two, the oil filter and the oil pump are connected through pipeline three, and the oil pump and the electromagnetic reversing valve are connected through pipeline Four connections, the electromagnetic reversing valve and the one-way valve are connected through the pipeline five; the piston and the piston rod are connected to each other, the oil cylinder has an upper chamber and a lower chamber of the oil cylinder, and the upper end cover of the oil cylinder is opened There are oil hole 1, oil hole 2 and the upper oil port of the oil cylinder. The upper chamber of the oil cylinder passes through the oil hole 1, the oil hole 2 on the upper end cover of the oil cylinder, the upper oil port of the oil cylinder and one end of the pipeline 6 of the hydraulic system. The other end of the pipeline six is connected with the electromagnetic reversing valve; the lower end cover is provided with the oil hole three, the oil hole four and the lower oil port of the oil cylinder, and the upper end of the oil hole three is installed There is a plug, and a damping hole is opened on the plug, and the lower chamber of the oil cylinder is connected in eight phases through the damping hole, the third oil hole, the fourth oil hole, the lower oil port of the oil cylinder and the pipeline of the hydraulic system; the balance Pipeline 1 is set between the overflow valve and pipeline 8, and pipeline 7 is set between the one-way valve and pipeline 8; the hydraulic system provides high-pressure oil to the oil cylinder, which enters the upper chamber of the oil cylinder and the oil cylinder respectively. The lower chamber can drive the piston to drive the piston rod, and move up and down through the piston rod, the lower connector of the oil cylinder, the lower pin, the lower mounting seat of the oil cylinder and the lifting frame to realize the lifting action of the lifting frame.

The braking device of the above-mentioned lifting motor can brake the lifting motor through power failure, and release the braking of the lifting motor through power-on. The braking device of the lifting motor has two working modes: independent working mode and coordinated working mode ;

Independent working mode: When the lifting motor is not powered on, the braking device of the lifting motor can work independently, that is, the lifting motor can be braked by power failure, and the lifting motor can be released by power-on;

Coordinated working mode: Both the lifting motor and the braking device of the lifting motor are energized at the same time, the braking device releases the brake, and the lifting motor rotates; both the lifting motor and the braking device of the lifting motor lose power at the same time, the lifting motor stops, and the brake The moving device brakes the lifting motor.

A guiding device may be arranged between the above-mentioned fixed frame and the lifting frame.

The above-mentioned damping holes can be arranged at any position on the lower end cover on the communication path from the lower cavity of the oil cylinder to the lower oil port of the oil cylinder.

The above-mentioned lifting motor is a common motor or a servo motor.

The balance overflow valve and the one-way valve in the above-mentioned hydraulic system play a balancing role, which can balance the gravity of the lifting frame.

The median function of the electromagnetic directional valve in the above hydraulic system is "H" type.

Beneficial effects are: a double-drive lifting mechanism provided by the present invention includes two sets of power-driven lifting mechanisms, a mechanical power-driven lifting mechanism and a hydraulic power-driven lifting mechanism, and the two sets of power-driven lifting mechanisms can work independently. can work simultaneously.

The present invention provides a double-drive lifting mechanism, in which any set of driving lifting mechanisms fails, and the other set of driving lifting mechanisms can immediately enter the main driving state to realize continuous operation of the lifting mechanism. At the same time, when any set of driving lifting mechanisms in the dual-drive lifting mechanism is working as the main drive, the other set of driving lifting mechanisms will automatically serve as a safety protection device to protect the lifting mechanism, improving the reliability and safety of the lifting mechanism. sex.

Description of drawings

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

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a double-drive lifting mechanism includes: a fixed frame 1 and a lifting frame 2, and includes a mechanical power lifting system and a hydraulic power lifting system;

The mechanical power lifting system includes lifting motor 3, reducer 5, gear 6, and rack 7; 3 to achieve braking, and to release the braking of the lifting motor 3 by being powered on. The braking device of the lifting motor 3 has two working modes: independent working mode and coordinated working mode. Independent working mode: When the lifting motor 3 is not energized, the braking device of the lifting motor 3 can work independently, that is, the lifting motor 3 can be braked by power failure, and the lifting motor 3 can be released by power-on. Coordinated working mode: Both the lifting motor 3 and the braking device of the lifting motor 3 are energized at the same time, the braking device releases the brake, and the lifting motor 3 rotates; both the lifting motor 3 and the braking device of the lifting motor 3 are powered off at the same time, the lifting The motor 3 stalls, and the braking device brakes the lifting motor 3.

The lifting motor 3 is installed on the motor mounting base 4, and the motor mounting base 4 is fixed on the lifting frame 2. The left end of lift motor 3 is equipped with reducer 5, and the output shaft of reducer 5 is connected with gear 6, and the rotary motion of lift motor 3 can be passed to gear 6 after reducer 5 decelerates, and drive gear 6 rotates. Rack 7 is installed on the fixed frame left column 8 of fixed frame 1, and is meshed with gear 6. Through the rotary motion of the lifting motor 3 installed on the lifting frame 2, and through the deceleration of the reducer 5, the driving gear 6 rotates to realize the vertical movement of the gear 6 in the vertical direction of the rack 7, and realize the lifting action of the lifting frame 2.

The hydraulic power lifting system comprises a hydraulic system, an oil cylinder, an oil cylinder lower connector 16, an oil cylinder lower mount 17, a lower pin 18, an oil cylinder upper mount 10, and an upper pin 11. Oil cylinder comprises oil cylinder barrel, oil cylinder upper end cover 12, piston 13, piston rod 14, lower end cover 15. The upper mounting seat 10 of the oil cylinder is installed on the fixed frame beam 9 of the fixed frame 1, and the upper end cover 12 of the oil cylinder is hinged with the upper mounting seat 10 of the oil cylinder through the upper pin shaft 11. The lower mounting base 17 of the oil cylinder is installed on the lifting frame 2, the lower connecting head 16 top of the oil cylinder is connected with the oil cylinder piston rod 14 by threads, and the lower connecting head 16 bottom of the oil cylinder is hinged with the lower mounting base 17 of the oil cylinder by the lower bearing pin 18. The hydraulic system includes an oil tank 29, an oil filter 33, an oil pump 34, a balance overflow valve 30, an overflow valve 32, an electromagnetic reversing valve 35, a one-way valve 36 and several pipelines. The pipeline is pipeline one 31, pipeline two 37, pipeline three 38, pipeline four 39, pipeline five 40, pipeline six 41, pipeline seven 42, pipeline eight 43; oil tank 29 and oil filter 33 The oil filter 33 and the oil pump 34 are connected through the pipeline three 38, the oil pump 34 and the electromagnetic reversing valve 35 are connected through the pipeline four 39, and the electromagnetic reversing valve 35 and the one-way The valves 36 are connected by the pipeline 5 40; the piston 13 and the piston rod 14 are connected to each other, the oil cylinder has an upper chamber 27 and a lower chamber 28 of the oil cylinder, and the upper end cover 12 of the oil cylinder is provided with an oil passage 1 24 and an oil passage 2 25 and the upper oil port 26 of the oil cylinder, the upper oil cylinder 27 communicates with one end of the pipeline six 41 of the oil cylinder 26 and the hydraulic system through the oil through hole one 24 on the upper end cover 12 of the oil cylinder, the oil through hole two 25, the oil cylinder The other end of the road six 41 is connected with the electromagnetic reversing valve 35, and the lower end cover 15 is provided with the oil passage three 21, the oil passage four 22 and the lower oil port 23 of the oil cylinder, and the upper end of the oil passage three 21 is provided with a plug 19, the plug 19 is provided with a damping hole 20, and the oil cylinder lower cavity 28 is connected with the pipeline eight 43 of the hydraulic system through the damping hole 20, the third oil hole 21, the fourth oil hole 22, the lower oil port 23 of the oil cylinder. A pipeline one 31 is arranged between the balance overflow valve 30 and the pipeline eight 43 , and a pipeline seven 42 is arranged between the check valve 36 and the pipeline eight 43 . The hydraulic system provides high-pressure oil to the cylinder, which enters the cylinder upper chamber 27 and the cylinder lower chamber 28 respectively, and can drive the piston 13 to drive the piston rod 14, and through the piston rod 14, the lower connector 16 of the cylinder, the lower pin 18, and the cylinder The lower mounting base 17 and the lifting frame 2 move up and down to realize the lifting action of the lifting frame 2.

A guiding device can be set between the fixed frame 1 and the lifting frame 2; the damping hole 20 can be arranged on the lower end cover 15 at any position on the lower end cover 15 from the oil cylinder lower chamber 28 to the oil cylinder lower oil port 23; the lifting motor 3 can be a common motor, It can also be a servo motor; the balance overflow valve 30 and the one-way valve 36 in the hydraulic system play a balancing role, which can balance the gravity of the lifting frame. The neutral function of the electromagnetic reversing valve 35 in the hydraulic system is "H" type.

The invention provides a double-drive lifting mechanism, which includes a mechanical power-driven lifting mechanism and a hydraulic power-driven lifting mechanism that can work independently or simultaneously.

The independent working principle of the mechanical power driven lifting mechanism:

(1) By driving the lifting motor 3 installed on the lifting frame 2 to generate rotational motion, and through the speed reducer 5 to decelerate and drive the gear 6 to rotate, the vertical movement of the gear 6 in the vertical direction of the rack 7 is realized, and the lifting frame 2 is realized. lifting action. By changing the direction of rotation of the lifting motor 3, the lifting and lowering actions of the lifting frame 2 can be realized respectively. When the hoisting motor 3 was working, the braking device of the hoisting motor 3 was in an energized state, and the braking of the hoisting motor 3 was released.

(2), when the lifting motor 3 stops working, the braking device of the lifting motor 3 is in a power-off state, and the braking of the lifting motor 3 is realized.

Independent working principle of hydraulic power driven lifting mechanism:

(1) The lifting state of the hydraulic power-driven lifting mechanism: the electromagnetic reversing valve 35 is in the right position, the oil inlet of the oil pump 34 absorbs oil from the oil tank 29 through the oil filter 33, and the high-pressure oil at the oil outlet of the oil pump 34 passes through the Pipeline 4 39, electromagnetic reversing valve 35 right position, pipeline 5 40, check valve 36, pipeline 7 42, pipeline 8 43, oil cylinder lower port 23, oil hole 4 22, oil hole 3 21 , the damping hole 20, enters the lower cavity 28 of the oil cylinder, and the oil pressure acts on the piston 13 to form a lifting force. Gravity realizes the lifting action of the lifting frame 2. The hydraulic oil in the upper chamber 27 of the oil cylinder passes through the oil hole 1 24, the oil hole 2 25, the oil cylinder upper oil port 26, the pipeline 6 41, and the electromagnetic reversing valve 35. to tank 29.

(2) The descending state of the hydraulic power-driven lifting mechanism: the electromagnetic reversing valve 35 is in the left position, the oil inlet of the oil pump 34 absorbs oil from the oil tank 29 through the oil filter 33, and the high-pressure oil at the oil outlet of the oil pump 34 passes through the Pipeline four 39, electromagnetic reversing valve 35 left position, pipeline six 41, oil cylinder upper oil port 26, oil through hole two 25, oil through hole one 24 enter the upper chamber 27 of the oil cylinder, and the oil pressure acts on the piston 13 to generate Downward thrust, at this time, due to the combined action of the lifting frame 2 gravity and the thrust formed by the oil pressure in the upper chamber 27 of the oil cylinder, the oil pressure formed inside the lower chamber 28 of the oil cylinder reaches the working pressure set by the balance overflow valve 30, and the balance overflow The flow valve 30 is opened under the action of pressure to realize the descending action of the lifting frame 2. The hydraulic oil in the lower chamber 28 of the oil cylinder passes through the damping hole 20, the third oil hole 21, the fourth oil hole 22, the lower oil port 23 of the oil cylinder, and the pipeline. Eight 43, pipeline one 31, balance overflow valve 30 returns to oil tank 29;

(3) The stop state of the hydraulic power-driven lifting mechanism: the electromagnetic reversing valve 35 is in the neutral working state. If the oil pump 34 does not stop working, the oil inlet of the oil pump 34 absorbs oil from the oil tank 29 through the oil filter 33, and the oil pump 34 The oil at the oil outlet returns to the oil tank 29 through the pipeline 4 39 and the electromagnetic reversing valve 35, and the gravity of the lifting frame is acted by the lower mounting seat 17 of the oil cylinder, the lower pin shaft 18, the lower connector 16 of the oil cylinder, and the piston rod 14. On the piston 13, the oil in the lower cavity of the oil cylinder 28 is closed under the joint action of the balance overflow valve 30 and the one-way valve 36 and cannot flow. Gravity makes the lifting frame 2 stop.

When the lifting mechanism driven by mechanical power is the main drive, the working principle of the hydraulic power driven lifting mechanism:

The oil pump 34 is in a stopped working state, and the electromagnetic reversing valve 35 is in a neutral working state.

(1) The lifting state of the lifting mechanism 2: the brake device of the lifting motor 3 is in the energized state, the brake on the lifting motor 3 is released, the lifting motor 3 rotates forward, and the gear 6 is driven forward through the reducer 5, and the gear 6 Engage with the rack 7, overcome the gravity of the lifting frame 2, and realize the lifting action of the lifting frame 2. While the lifting frame 2 is being lifted, the piston 13 is driven to move upward through the lower mounting seat 17 of the oil cylinder, the lower pin shaft 18, the lower connector 16 of the oil cylinder, and the piston rod 14. 21. Oil hole four 22, oil cylinder lower oil port 23, pipeline eight 43, one-way valve 36, pipeline five 40, electromagnetic reversing valve 35, the middle position absorbs oil from the oil tank 29, and the hydraulic oil in the upper chamber 27 of the oil cylinder Through oil hole one 24, oil hole two 25, oil cylinder upper oil port 26, pipeline six 41, electromagnetic reversing valve 35, the middle position returns to the oil tank 29, and the oil cylinder is in the follow-up state.

(2) The falling state of the lifting mechanism 2: the braking device of the lifting motor 3 is in the energized state, the lifting motor 3 is released, the lifting motor 3 rotates in the reverse direction, and the gear 6 is driven to rotate in the reverse direction through the reducer 5, and the gear 6 Engage with the rack 7 to realize the descending action of the lifting frame 2. When the lifting frame 2 descends, the piston 13 is driven to move downward through the lower mounting seat 17 of the oil cylinder, the lower pin shaft 18, the lower connector 16 of the oil cylinder, and the piston rod 14. function, the oil pressure formed inside the lower chamber 28 of the oil cylinder reaches the working pressure set by the balance relief valve 30, the balance relief valve 30 opens under the pressure, and the hydraulic oil in the lower chamber 28 of the oil cylinder passes through the damping hole 20 and the oil passage three 21. Oil hole 4 22, oil cylinder lower oil port 23, pipeline 8 43, pipeline 1 31, balance overflow valve 30 and return to the fuel tank 29; oil cylinder upper cavity 27 passes through oil hole 1 24, oil hole 2 25 , Oil cylinder upper oil port 26, pipeline six 41, electromagnetic reversing valve 35 middle positions draw oil liquid from fuel tank 29, and oil cylinder is in follow-up state.

(3), the stopping state of the lifting mechanism 2: the lifting motor 3 is in a power failure state, the braking device of the lifting motor 3 is in a power failure state, the lifting motor 3 is braked, the gear 6 stops, and the lifting frame 2 stops moving. Once the braking device of the lifting motor 3 breaks down, the lifting motor 3 cannot be braked, and the hydraulic power-driven lifting mechanism will play a protective role. Due to the failure of the braking device of the lifting motor 3, the braking of the lifting motor 3 cannot be achieved. The gravity of the lifting frame 2 acts on the piston 13 through the lower mounting seat 17, the lower pin shaft 18, the lower connector 16 of the oil cylinder, and the piston rod 14. Up, the oil in the lower cavity of the oil cylinder 28 is closed under the combined action of the balance overflow valve 30 and the one-way valve 36 and cannot flow. The lower cavity of the oil cylinder 28 forms a corresponding oil pressure to balance the gravity of the lifting frame 2, so that Elevating frame 2 is in stop state. If the balance overflow valve 30 or the one-way valve 36 also fails, the lifting frame 2 will move downward under the action of gravity, and the oil in the lower chamber of the oil cylinder 28 will flow out through the damping hole 20, because the damping hole 20 will have a large impact on the lower chamber of the oil cylinder. The oil liquid flowing out of 28 produces a damping effect, and the outflow speed of oil liquid 28 in the lower cavity of the load oil cylinder is limited, which is equivalent to limiting the descending speed of piston 13 and piston rod 14, that is, to ensure that the lifting frame 2 can only be operated according to a certain speed even if it is in a fault state. Move down at a low speed until the lifting frame 2 touches the ground, or the oil cylinder has finished the stroke, and the piston 13 is close to the lower end cover 15 of the oil cylinder, so as to avoid the rapid decline of the lifting frame 2 to form an impact and cause losses.

When hydraulic power drives the lifting mechanism as the main drive, the state of the mechanical power driving lifting mechanism:

(1) When the hydraulic power drives the lifting mechanism to lift and lower the lifting frame 2, the lifting motor 3 is in a power-off state, and the braking device of the lifting motor 3 is in a power-on state, the brake on the lifting motor 3 is released, and the lifting motor 3 In follow-up state.

(2), when the hydraulic power drives the lifting mechanism to stop working, the lifting motor 3 is in a power failure state, and the braking device of the lifting motor 3 is in a power failure state, which brakes the lifting motor 3 and protects the lifting frame 2.

Beneficial effects are: a double-drive lifting mechanism provided by the present invention includes two sets of power-driven lifting mechanisms, a mechanical power-driven lifting mechanism and a hydraulic power-driven lifting mechanism, and the two sets of power-driven lifting mechanisms can work independently. can work simultaneously.

The present invention provides a double-drive lifting mechanism, in which any set of driving lifting mechanisms fails, and the other set of driving lifting mechanisms can immediately enter the main driving state to realize continuous operation of the lifting mechanism. At the same time, when any set of driving lifting mechanisms in the dual-drive lifting mechanism is working as the main drive, the other set of driving lifting mechanisms will automatically serve as a safety protection device to protect the lifting mechanism, improving the reliability and safety of the lifting mechanism. sex.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A double-drive lifting mechanism, characterized in that it comprises: a fixed frame and a lifting frame, and includes a mechanical power lifting system and a hydraulic power lifting system; The mechanical power lifting system includes a lifting motor, a reducer, a gear, and a rack; the lifting motor has a braking device; the lifting motor is installed on a motor mounting base, and the motor mounting base is fixed on the lifting frame; The left end of the lifting motor is equipped with a reducer, the output shaft of the reducer is connected to the gear, the rotation of the lifting motor is transmitted to the gear after being decelerated by the reducer, and the gear is driven to rotate; the rack is installed on the fixing machine The rack is fixed on the left column of the rack and meshes with the gears; through the rotary motion of the lifting motor installed on the lifting frame, and through the deceleration of the reducer, the gears are driven to rotate, and the gears move up and down in the vertical direction of the rack. Realize the lifting action of the lifting frame; The hydraulic power lifting system includes a hydraulic system, an oil cylinder, an oil cylinder lower connector, an oil cylinder lower mounting seat, a lower pin shaft, an oil cylinder upper mounting seat, and an upper pin shaft. The oil cylinder includes an oil cylinder barrel, an oil cylinder upper end cover, a piston, and a piston rod , lower end cover; the upper mounting seat of the oil cylinder is installed on the fixed frame crossbeam of the fixed frame, and the upper end cover of the oil cylinder is hinged with the upper mounting seat of the oil cylinder through the upper pin; the lower mounting seat of the oil cylinder is installed on the lifting frame , the upper part of the lower connecting head of the oil cylinder is connected with the piston rod of the oil cylinder through threads, and the lower part of the lower connecting head of the oil cylinder is hinged with the lower mounting seat of the oil cylinder through the lower pin; the hydraulic system includes an oil tank, an oil filter, an oil pump, a balance overflow Flow valve, overflow valve, electromagnetic reversing valve, check valve and several pipelines; said several pipelines are pipeline one, pipeline two, pipeline three, pipeline four, pipeline five, pipeline six, Pipeline 7 and pipeline 8, the oil tank and the oil filter are connected through pipeline 2, the oil filter and the oil pump are connected through pipeline 3, and the oil pump and the electromagnetic reversing valve are connected through pipeline The electromagnetic reversing valve and the one-way valve are connected through the pipeline five; the piston and the piston rod are connected to each other, the oil cylinder has an upper cavity and a lower cavity of the oil cylinder, and the upper end cover of the oil cylinder There are oil hole 1, oil hole 2 and the upper oil port of the oil cylinder. The upper chamber of the oil cylinder passes through the oil hole 1, the oil through hole 2, the upper oil port of the oil cylinder and the pipeline 6 of the hydraulic system on the upper end cover of the oil cylinder. One end is connected, and the other end of the pipeline six is connected with the electromagnetic reversing valve; the lower end cover is provided with the oil hole three, the oil hole four and the lower oil port of the oil cylinder, and the upper end of the oil hole three A plug is installed, and a damping hole is opened on the plug, and the lower cavity of the oil cylinder is connected in eight phases through the damping hole, the oil hole three, the oil hole four, the lower oil port of the oil cylinder and the pipeline of the hydraulic system; Pipeline 1 is set between the balance overflow valve and pipeline 8, and pipeline 7 is set between the one-way valve and pipeline 8; the hydraulic system provides high-pressure oil to the oil cylinder, which enters the upper chamber of the oil cylinder and the oil cylinder respectively. In the lower cavity of the oil cylinder, the driving piston drives the piston rod, and moves up and down through the piston rod, the lower connector of the oil cylinder, the lower pin shaft, the lower mounting seat of the oil cylinder and the lifting frame to realize the lifting action of the lifting frame. 2. The double-drive lifting mechanism according to claim 1, characterized in that: the braking device of the lifting motor brakes the lifting motor through power loss, and releases the braking of the lifting motor through power-on, and the lifting The braking device of the motor has two working modes: independent working mode and coordinated working mode; Independent working mode: When the lifting motor is not energized, the braking device of the lifting motor can work independently, that is, the lifting motor can be braked by power failure, and the lifting motor can be released by power-on; Coordinated working mode: Both the lifting motor and the braking device of the lifting motor are energized at the same time, the braking device releases the brake, and the lifting motor rotates; both the lifting motor and the braking device of the lifting motor lose power at the same time, the lifting motor stops, and the brake The moving device brakes the lifting motor. 3. The double-drive lifting mechanism according to claim 1, characterized in that: a guiding device is provided between the fixed frame and the lifting frame. 4. The double-drive lifting mechanism according to claim 1, characterized in that: the lifting motor is a common motor or a servo motor. 5. The double-drive lifting mechanism according to claim 1, characterized in that: the balance overflow valve and the one-way valve in the hydraulic system play a balancing role to balance the gravity of the lifting frame. 6. The double-drive lifting mechanism according to claim 1, characterized in that: the neutral function of the electromagnetic reversing valve in the hydraulic system is "H" type.