CN217555675U - Hydraulic control system of motor, control valve group and hoisting equipment - Google Patents

Abstract

The utility model relates to an engineering machine tool technical field, concretely relates to hydraulic control system and hoist of motor. A hydraulic control system for a motor, comprising: the oil tank is used for storing hydraulic oil; the pump and the hydraulic motor are used for driving the traction winch to act and retracting the traction rope; a first oil passage and a second oil passage; the hydraulic oil pumped out of the oil tank by the pump flows back to the oil tank through the first oil way, the hydraulic motor and the second oil way in sequence; a relief valve for defining a maximum pressure at the pump outlet; and at least one flow rate control valve provided in the second oil passage for controlling a rotation speed of the hydraulic motor. The rotation speed of the hydraulic motor is further controlled by providing a flow rate control valve on the second oil passage.

Description

Hydraulic control system of motor, control valve group and hoisting equipment

Technical Field

The utility model relates to an engineering machine tool technical field, concretely relates to hydraulic control system and hoist of motor.

Background

In the hoisting operation process of the hoisting machine, in order to improve the stability and avoid large amplitude shaking in the hoisting object moving process, two or more actions of the walking action, the hoisting action and the rotation action can be carried out in sequence, such as hoisting first and then rotating, or walking first and then rotating and other action modes.

In some special hoisting machinery work occasions, such as the capital construction industry, pit hoisting work conditions, or the weight of the hoisted hoisting object is relatively light, in order to improve the efficiency of the whole construction, the rotation or hoisting speed is further selected to be improved. In the process of quick rotation, the suspended load is influenced by centrifugal force and is far away from the crane. The faster the rotation speed, the greater the centrifugal force applied to the suspended load and the greater the shaking amplitude. Or after the suspended load is influenced by external force, the suspended load can shake to influence the hoisting process.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a hydraulic control system and a lifting apparatus for solving the problem that the rotating speed of a motor is difficult to control.

In order to solve the technical problem, the utility model provides a hydraulic control system of motor, include: the oil tank is used for storing hydraulic oil; the pump and the hydraulic motor are used for driving the traction winch to act and retracting the traction rope; a first oil passage and a second oil passage; hydraulic oil pumped out from the oil tank by the pump flows back to the oil tank through the first oil way, the hydraulic motor and the second oil way in sequence; a relief valve for defining a maximum pressure at the pump outlet; and at least one flow rate control valve provided in the second oil passage for controlling a rotation speed of the hydraulic motor.

Furthermore, the second oil path is provided with one flow rate control valve, and the hydraulic motor can be controlled to rotate by adjusting the flow rate control valve through hydraulic oil flowing out of the hydraulic motor passing through the flow rate control valve.

Further, the second oil passage is provided with at least two flow rate control valves, and the flow rate control valves are arranged in parallel with each other.

Further, the flow rate control valve is one of a throttle valve and a proportional valve.

Further, the hydraulic control system of motor still includes: a switching valve having at least two operating positions; in the first working position, hydraulic oil pumped by the pump completely flows into an oil tank through the hydraulic motor; in the second operating position, the hydraulic oil pumped by the pump flows completely through the directional control valve into the oil tank.

Further, the hydraulic control system of motor still includes: the one-way valve is arranged between the oil tank and the oil outlet of the pump; the hydraulic oil in the oil tank can flow into the oil outlet of the pump through the one-way valve.

Further, a control valve group for a hydraulic control system of a motor, the control valve group having an overflow valve, a switching valve, a check valve; the switch valve, the one-way valve and the overflow valve are arranged in parallel.

Further, hoisting equipment has the structure of getting off, the structure of getting on the bus, and the structure of getting on the bus rotates to be connected on the structure of getting off, still includes: a traction winch on which a traction rope is wound; the hydraulic control system for a motor of any one of claims 1 to 6, wherein the hydraulic motor is used to drive the traction winch.

Further, hoisting equipment still includes: the guide pulley is arranged on the hoisting equipment; one end of the traction rope penetrates through the groove of the guide pulley.

Further, hoisting equipment still includes: the arm support is rotatably arranged at one end of the upper vehicle structure; the guide pulley is installed on one side, close to the hoisting object, of the arm support.

The utility model has the advantages of as follows:

1. when the hoisting equipment works, the highest limiting pressure of the overflow valve is adjusted for hoisting objects with different weights, so that the application range of a hydraulic control system of the motor is wider;

2. the second oil way is provided with the flow rate control valve, so that the rotating speed of the hydraulic motor can be further adjusted, and the retracting speed of the traction rope on the traction winch can be adjusted according to the requirement of actual working conditions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 illustrates a front view of a prior art lifting apparatus in a construction condition;

fig. 2 shows a front view of the hoisting device of the present invention in a construction situation;

FIG. 3 shows a partial enlarged view of FIG. 2 at C;

figure 4 shows a schematic diagram of the hydraulic control system of the motor of the present invention;

fig. 5 shows an enlarged partial view of the control valve block of fig. 4.

A hoisting device 100, a transportation vehicle 200, a suspended load 300,

A lower vehicle structure 11, an upper vehicle structure 12, an arm support 13, a guide pulley 14, a steel wire rope 15,

The hydraulic control system comprises a pump 20, a first oil path 30, a second oil path 40, a hydraulic motor 50, a control valve group 60, a switch valve 61, a one-way valve 62, an overflow valve 63, a flow rate control valve 70, a traction winch 80, a traction rope 81 and an oil tank 90.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The hoisting device is used for moving the hoisted objects from a low position to a high position, and then the hoisted objects are horizontally moved to a target position through a rotary motion. In order to reduce the shaking of the hoisting object, the hoisting of heavy hoisting objects or hoisting objects with larger sizes can adopt a method of reducing the moving speed, such as hoisting a dome in a nuclear power construction site. The hoisting device is characterized in that the hoisting object moves from a low position to a high position, then the hoisting object horizontally moves to a target position through a rotary motion, the movement speed is reduced, namely, the rotation speed of a hoisting winch in the hoisting device and the rotation motion speed are reduced, and the shaking amplitude of the hoisting object relative to the hoisting device in the hoisting object moving process is reduced through the reduction of the movement speed, so that accurate hoisting is realized.

However, the solution is applied to the process of hoisting the small-sized hoisting object 300, and has the defect of reducing the overall construction efficiency. For example, in the construction of a subway tunnel, the earth underground is transported out of the construction site, the hoisting device 100 is required to move the earth from the ground to the transport vehicle 200 and then transported out of the construction site by the transport vehicle 200, and this process is repeated several times until the earth under the ground is completely transported. Reducing the speed of the drive structure (one of the hoist, hydraulic motor, or electric motor) in the hoisting equipment reduces the overall construction speed.

The speed of a driving structure on the hoisting equipment can be increased, and a method for installing a traction winch device on the hoisting equipment is adopted, namely, a traction rope led out from the traction winch is connected to the hoisting object in the process of moving the hoisting object. When the suspended load shakes, the suspended load is driven to move due to the speed of the driving structure of the hoisting equipment or external influence factors (such as wind, lateral force applied to the suspended load). Traction force is provided through the traction rope so as to reduce the shaking amplitude of the suspended load. Through the operating speed who improves drive structure, and provide traction force through the haulage rope, realize improving holistic efficiency of construction.

Taking a walking type hoisting device as an example, the hoisting device is provided with a lower vehicle structure 11, and the lower vehicle structure 11 can be a crawler type, a wheel type or a fixed type (equivalent to ground fixing). The top of the lower vehicle structure 11 is provided with an upper vehicle structure 12, and the upper vehicle structure 12 is connected with the lower vehicle structure 11 through a slewing bearing. The upper vehicle structure 12 can be pivoted relative to the lower vehicle structure 11 by means of a pivot bearing. And an arm support 13 is arranged at one end of the upper vehicle structure 12 through a pin shaft. An amplitude variation device is arranged between the arm support 13 and the upper vehicle structure 12, and an included angle between the arm support 13 and the top of the upper vehicle structure 12 is changed through the amplitude variation device.

A traction winch 80 is mounted on the superstructure 12. One end of a traction rope 81 on the traction winch 80 is connected to the traction winch 80, and the other end is connected with the suspended load 300. The traction winch 80 can adjust the traction force applied to the suspended load 300 by winding and unwinding the length of the traction rope 81.

In order to avoid the friction between the traction rope 81 extending from the traction winch 80 and the crane, which causes the abrasion of the traction rope 81. A guide pulley 14 is mounted on the boom 13 of the hoisting apparatus 100. The traction rope 81 extending from the traction winch 80 passes through the groove of the guide pulley 14 and then is connected with the suspended load 300.

For an external power source of the traction winch, a hydraulic motor or a motor or other execution mechanisms can be adopted to provide power for the traction winch. The hydraulic motor is used to provide power to the winch, and the rotation speed of the hydraulic motor 50 is generally controlled by controlling the flow rate of hydraulic oil flowing through the hydraulic motor.

As for the hydraulic control system of the hydraulic motor, as shown in fig. 4, the hydraulic control system of the motor includes a pump 20, and the pump 20 can move hydraulic oil in an oil tank 90 into a hydraulic line. The pump 20 is powered by an external device (e.g., an engine). The pump 20 is rigidly connected to the engine (not shown), i.e. the pump 20 is operated when the lifting device is in operation. The pump 20 is a fixed-quantity gear pump.

And a hydraulic motor 50 having two working ports, one of which is communicated with the oil outlet of the pump 20 through the first oil passage 30, and the other of which is communicated with the oil tank through the second oil passage 40. That is, the pump 20 sends the hydraulic oil in the oil tank 90 to the hydraulic motor 50 through the first oil passage 30, and the hydraulic oil flows back to the oil tank through the hydraulic motor 50 and the second oil passage 40.

The traction winch 80 has a drum on which a traction rope 81 is sequentially wound. The output shaft of the hydraulic motor 50 is directly or indirectly connected with the winding drum of the traction winch 80, so that the hydraulic motor 50 drives the traction winch 80 to rotate, and the traction rope 81 is wound and unwound. One section of haulage rope 81 can be dismantled and connect on pulling hoist 80, and the other end is connected with the suspended load thing, and pulling hoist 80 provides traction force through haulage rope 81, reaches the effect that reduces the suspended load thing amplitude of rocking.

It will be appreciated that as the pump 20 is driven to rotate faster, the greater the amount of hydraulic oil pumped by the pump 20 per unit time, the faster the corresponding hydraulic motor 50 rotates. So that the speed of the traction winch 80 for winding and unwinding the traction rope 81 is faster.

During the operation of the pump 20, hydraulic oil is continuously pumped from the oil tank 90 and flows back to the oil tank through the first oil path 30, the hydraulic motor 50 and the second oil path 40. To avoid the hydraulic pressure in the first oil passage 30 from becoming too high, resulting in disconnection of the connecting shaft between the engine and the pump 20. An overflow valve 63 is arranged between the first oil path 30 and the oil tank, and the overflow valve 63 is matched with the constant delivery pump 20 to achieve the pressure stabilizing effect. The maximum limiting pressure of the overflow valve 63 is adjustable in this embodiment. When the weight of the suspended load is changed, the maximum limit pressure of the relief valve 63 can be adjusted. When the weight of the suspended load is increased, the maximum limit pressure of the overflow valve 63 can be increased.

In one embodiment, the relief valve 63 is an electric proportional relief valve, and the maximum limiting pressure can be adjusted by directly controlling the control current of the electric proportional relief valve.

The control end of the electric proportional overflow valve can be arranged in the cab, and the control current of the electric proportional overflow valve can be directly adjusted through the control end.

In order to control the on/off of the hydraulic oil flowing through the hydraulic motor 50, a control valve group 60 is provided between the first oil passage 30 and the second oil passage 40. In the present exemplary embodiment, the control valve assembly 60 is a directional control valve 61, the directional control valve 61 having at least 2 operating positions, in the first operating position, hydraulic oil flowing completely through the hydraulic motor 50 into the tank. In the second operating position, the hydraulic oil pumped by the pump 20 flows completely into the tank via the directional control valve 61.

In the present embodiment, the direction valve 61 is a normally open type two-position two-way direction valve. When the crane stops working, the normally open type reversing valve is in a conducting state, namely the reversing valve 61 is located at the first working position, and hydraulic oil pumped out by the pump 20 directly flows into the oil tank through the reversing valve 61. When the crane works and the traction winch works, the normally open type reversing valve is adjusted to be in a cut-off state, namely the reversing valve 61 is located at the second working position. The hydraulic oil pumped by the pump 20 is required to flow back to the oil tank through the hydraulic motor 50. Of course, the control valve may also be a common switch valve, which is opened or closed by manual, electric, hydraulic, pneumatic, electromagnetic hydraulic, electro-hydraulic, pneumatic hydraulic, etc. The direction valve 61 is an electromagnetic direction valve.

In order to prevent the hydraulic oil in the oil tank from flowing back to one side of the hydraulic motor 50 after the hydraulic motor 50 rotates at a high speed, a check valve 62 is provided between the first oil passage 30 and the oil tank. The hydraulic oil in the tank can flow into the first oil passage 30 through the check valve 62, and the hydraulic oil in the first oil passage 30 cannot flow into the tank through the check valve 62.

In order to save installation space and avoid installation errors among hydraulic pipelines, the reversing valve 61, the check valve 62 and the overflow valve 63 are integrated into a control valve group 60.

To adjust the rotational speed of the hydraulic motor 50, the flow rate of the hydraulic oil flowing through the flow rate control valve 70 is controlled by the flow rate control valve 70.

In one embodiment, at least one flow rate control valve 70 is provided in series in the second oil passage 40. The flow rate of the hydraulic oil flowing from the hydraulic motor 50 to the oil tank is controlled by controlling the opening of the flow rate control valve 70, so that the rotation speed of the hydraulic motor 50 is controlled, and the rotation speed of the traction winch 80 and the retraction speed of the traction rope 81 are controlled.

In one embodiment, two identical flow rate control valves 70 are provided on the second oil passage 40, and the two identical flow rate control valves 70 are provided in parallel with each other. After one of the flow rate control valves 70 is damaged, the other flow rate control valve 70 can work normally, so that the hydraulic motor 50 cannot further adjust the rotating speed due to the damage of the flow rate control valve 70 to the hydraulic system is prevented from being influenced.

In one embodiment, two flow rate control valves 70 for adjusting the throttle cross-sectional areas of the oil passages are provided in the second oil passage 40. The flow rate control valve 70 for adjusting the throttle cross section of the oil path can be selected differently for suspended loads 300 of different weights or different use conditions. If precise control of the operation of the traction rope 81 is required, the flow rate control valve 70 that enables a small range of adjustment of the throttle cross section of the oil passage can be selected. Normally, the flow rate control valve 70 that adjusts the throttle cross section of the oil passage over a wide range is selected. In the case where one flow rate control valve 70 is used, the other flow rate control valve 70 is not used, avoiding mutual interference. The two flow rate control valves 70 are arranged in parallel with each other.

The flow rate control valve 70 is one of a throttle valve, a proportional valve, or other hydraulic components to adjust the rotation speed of the hydraulic motor, so as to control the retraction speed of the pull rope 81.

Referring to fig. 2, when the wire rope 15 of the hoisting apparatus 100 is released from a high position to a low position, the traction rope 81 is connected to the outside of the housing for loading the suspended load 300 and released from the high position to the low position. Can be quickly released from high position to low position. After the hoist 300 is loaded, the hoisting device 100 hoists from the low position to the high position, and the traction winch 80 is controlled to take in the traction rope 81.

When the suspended load 300 is heavy during the movement of the suspended load 300, the maximum limit pressure of the relief valve 63 is increased, and conversely, the maximum limit pressure is decreased. In the whole process of moving the suspended load, the rotation speed of the hydraulic motor 50 is further controlled by adjusting the flow rate control valve 70, so that the rope winding and unwinding speed of the traction rope 81 is controlled.

During the hoisting operation, the hoisting object 300 is subjected to centrifugal force due to the rapid rotation of the hoisting equipment 100, and the maximum limit pressure of the relief valve 63 can be adjusted to be high, so that the traction force provided by the hydraulic motor 50 is increased, and the shaking amplitude of the hoisting object 300 is reduced. During the slow rotation of the hoisting equipment 100, the centrifugal force applied to the hoisted object 300 is small, the highest limiting pressure of the overflow valve 63 is reduced, and the situation that the hoisted object 300 is caused by the fact that the traction rope 81 provides too much traction force due to the rotation of the hydraulic motor 50 and the potential safety hazard is possibly caused by the fact that the too much traction force is drawn to lean against the hoisting equipment is avoided.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims (10)

1. A hydraulic control system for a motor, comprising: an oil tank (90) for storing hydraulic oil; a pump (20), characterized by further comprising:

the hydraulic motor (50) is used for driving the traction winch (80) to act and retracting the traction rope (81);

a first oil passage (30) and a second oil passage (40);

the hydraulic oil pumped out of the oil tank (90) by the pump (20) flows back to the oil tank (90) through the first oil path (30), the hydraulic motor (50) and the second oil path (40) in sequence;

a relief valve (63) for defining a maximum pressure at an outlet of the pump (20);

at least one flow rate control valve (70) provided in the second oil passage (40) for controlling a rotational speed of the hydraulic motor (50).

2. The hydraulic control system of a motor according to claim 1, wherein the second oil passage (40) is provided with a flow rate control valve (70), and the hydraulic oil from the hydraulic motor (50) passes through the flow rate control valve (70), and the rotational speed of the hydraulic motor (50) is controlled by adjusting the flow rate control valve (70).

3. The hydraulic control system of a motor according to claim 1, wherein the second oil passage (40) is provided with at least two flow rate control valves (70), and a plurality of the flow rate control valves (70) are arranged in parallel with each other.

4. The hydraulic control system of a motor according to claim 1, wherein the flow rate control valve (70) is one of a throttle valve and a proportional valve.

5. The hydraulic control system of a motor according to claim 1, further comprising:

an on-off valve (61), said on-off valve (61) having at least two operating positions;

in the first working position, the hydraulic oil pumped by the pump (20) completely flows into the oil tank through the hydraulic motor (50);

in the second operating position, the hydraulic oil pumped by the pump (20) flows completely into the tank via the switching valve (61).

6. The hydraulic control system of a motor according to claim 1, further comprising:

a one-way valve (62) disposed between a tank and an outlet of the pump (20);

the hydraulic oil in the oil tank can flow into the oil outlet of the pump (20) through the one-way valve (62).

7. A control valve group for a hydraulic control system of a motor, characterized in that said control valve group (60) has an overflow valve (63), an on-off valve (61), a non-return valve (62);

the switch valve (61), the one-way valve (62) and the overflow valve (63) are arranged in parallel.

8. The utility model provides a hoisting equipment, has the structure of getting off, the structure of getting on the bus rotates to be connected on the structure of getting off, its characterized in that still includes:

a traction winch (80) on which a traction rope (81) is wound;

a hydraulic control system for a motor as claimed in any one of claims 1 to 6, in which a hydraulic motor (50) is used to drive the traction winch (80).

9. The hoisting device of claim 8, further comprising:

a guide pulley (14) mounted on the hoisting device;

one end of the traction rope (81) passes through the groove of the guide pulley (14).

10. The hoisting device of claim 9, further comprising:

the arm support (13), the said arm support (13) is set up in one end of the upper vehicle structure rotatably;

the guide pulley (14) is arranged on one side of the arm support (13) close to the hanging object (300).

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