CN111271342A - Oil cylinder bending-prevention overvoltage protection system, oil cylinder overvoltage protection method and crane - Google Patents
Oil cylinder bending-prevention overvoltage protection system, oil cylinder overvoltage protection method and crane Download PDFInfo
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- CN111271342A CN111271342A CN202010134090.9A CN202010134090A CN111271342A CN 111271342 A CN111271342 A CN 111271342A CN 202010134090 A CN202010134090 A CN 202010134090A CN 111271342 A CN111271342 A CN 111271342A
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- pressure
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- pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
- B66C23/80—Supports, e.g. outriggers, for mobile cranes hydraulically actuated
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- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
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Abstract
The invention provides an oil cylinder bending-prevention overvoltage protection system, an oil cylinder overvoltage protection method and a crane, and relates to the technical field of hydraulic pressure. Compared with the prior art, the oil cylinder bending-prevention overvoltage protection system provided by the invention has the advantages that the pressure relief pipeline is additionally arranged, the pressure stop valve is arranged on the pressure relief pipeline and selectively conducts or blocks the pressure relief pipeline according to the oil pressure, so that the oil pressure can be timely relieved when the oil pressure rises due to the fact that the horizontal oil cylinder is blocked due to stretching and retracting, the horizontal oil cylinder is prevented from being deviated or bent, the safety of the horizontal oil cylinder is improved, and the horizontal oil cylinder is effectively protected.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to an oil cylinder bending-prevention overvoltage protection system, an oil cylinder overvoltage protection method and a crane.
Background
The horizontal supporting leg of the crane is an important link of the whole lower-car supporting leg system, and the horizontal oil cylinder undertakes the expansion and contraction of the movable supporting leg box. The support leg is widely applied to medium and small tonnage H-shaped support leg systems.
The horizontal oil cylinder is a non-bearing part in the working process, the cylinder diameter and the rod diameter of the oil cylinder are designed to be small, but in an actual working scene, for example, clamping stagnation in the telescopic process, collision of movable supporting legs against obstacles in the telescopic process and misoperation can cause bending of the horizontal oil cylinder, so that equipment cannot work normally in a light condition, and safety accidents are caused in a heavy condition.
The inventor researches and discovers that the reason for bending the horizontal oil cylinder is that the pressure in the oil cylinder is too high to release pressure, so that the horizontal supporting leg is deflected and bent during stretching, and further normal stretching of the horizontal supporting leg is influenced.
In view of this, it is very important to design and manufacture an oil cylinder bending-prevention overpressure protection system which can timely release pressure of an oil cylinder and prevent the oil cylinder from deviating when stretching.
Disclosure of Invention
The invention aims to provide an oil cylinder bending-prevention overpressure protection system which can timely perform pressure relief operation on a horizontal oil cylinder, avoid continuous extension of the horizontal oil cylinder under high pressure due to overhigh pressure in the horizontal oil cylinder and prevent the oil cylinder from deviating during extension.
Another object of the present invention is to provide an oil cylinder overpressure protection method, which can perform a pressure relief operation on a horizontal oil cylinder in time to avoid an excessive internal pressure of the oil cylinder.
Another object of the present invention is to provide a crane, which can prevent the internal pressure of the cylinder from being too high through a pressure relief manner, and prevent the cylinder from shifting when it extends and retracts, thereby preventing the horizontal leg from shifting and bending, and ensuring the safe use of the horizontal leg.
The invention is realized by adopting the following technical scheme.
In one aspect, the invention provides an oil cylinder bending-prevention overvoltage protection system which comprises a plurality of horizontal oil cylinders, a multi-way valve, a pressure relief pipeline and a pressure cut-off valve, wherein the multi-way valve is provided with a plurality of oil paths, the oil paths are connected with the horizontal oil cylinders in a one-to-one correspondence manner, one end of the pressure relief pipeline is respectively connected with the horizontal oil cylinders, the other end of the pressure relief pipeline is used for pressure relief, the pressure cut-off valve is arranged on the pressure relief pipeline, and the pressure cut-off valve is used for plugging the pressure relief pipeline when the pressure of the pressure relief pipeline is smaller than a preset pressure value and conducting the pressure relief pipeline when the pressure of the pressure relief pipeline is larger than or equal to the preset pressure value.
The oil cylinder bending-prevention overvoltage protection system further comprises a pressure sensor and a control assembly, wherein the pressure sensor is arranged on the pressure relief pipeline and used for detecting the pressure on the pressure relief pipeline, the pressure sensor is also used for generating a first pressure signal when the pressure of the pressure relief pipeline is smaller than a preset pressure value, and generating a second pressure signal when the pressure of the pressure relief pipeline is larger than or equal to the preset pressure value;
the control assembly is respectively connected with the pressure sensor and the pressure stop valve electrically and is used for controlling the pressure stop valve to block the pressure relief pipeline according to the first pressure signal and controlling the pressure stop valve to conduct the pressure relief pipeline according to the second pressure signal.
Further, the control assembly includes controller and relay, the relay with the pressure trip valve electricity is connected, the controller respectively with pressure sensor with the relay is connected the electricity and is connected, is used for the foundation first pressure signal control the relay power supply, so that the shutoff of pressure trip valve the pressure release pipeline, the controller still is used for the foundation second pressure signal control the relay outage, so that the pressure trip valve switches on the pressure release pipeline.
Further, the preset pressure value is 5 MPa.
Furthermore, each horizontal oil cylinder comprises an oil cylinder body, a piston and a telescopic rod, the piston is arranged in the oil cylinder body, the telescopic rod extends into the oil cylinder body and is connected with one side of the piston, an oil cavity is formed between one side, far away from the telescopic rod, of the piston and the inner wall of the oil cylinder body, and the oil circuit and the pressure relief pipeline are respectively communicated with the oil cavity.
Furthermore, one end of the pressure relief pipeline, which is far away from the horizontal oil cylinder, is provided with a load relief device, and the load relief device is used for receiving hydraulic oil flowing out of the pressure relief pipeline.
Furthermore, the pressure relief pipeline comprises a plurality of shunting sections, a plurality of flow collecting sections and a pressure relief section, the shunting sections are all connected with the horizontal oil cylinder, the flow collecting sections are respectively connected with the shunting sections, one end of the pressure relief section is connected with the flow collecting section, and the pressure stop valve is arranged on the pressure relief section.
In another aspect, the invention provides an oil cylinder overvoltage protection method, which is suitable for the oil cylinder bending-prevention overvoltage protection system and comprises the following steps:
detecting the pressure of a pressure relief pipeline;
when the pressure of the pressure relief pipeline is smaller than a preset pressure value, the pressure relief pipeline is blocked;
and when the pressure of the pressure relief pipeline is greater than or equal to the preset pressure value, the pressure relief pipeline is conducted.
In another aspect, the invention provides a crane, which includes an oil cylinder bending and overvoltage preventing protection system, where the oil cylinder bending and overvoltage preventing protection system includes a plurality of horizontal oil cylinders, a multi-way valve, a pressure relief pipeline and a pressure cut-off valve, the multi-way valve has a plurality of oil paths, the plurality of oil paths are connected to the plurality of horizontal oil cylinders in a one-to-one correspondence manner, one end of the pressure relief pipeline is connected to the plurality of horizontal oil cylinders, the other end of the pressure relief pipeline is used for pressure relief, the pressure cut-off valve is disposed on the pressure relief pipeline, and the pressure cut-off valve is used for plugging the pressure relief pipeline when the pressure of the pressure relief pipeline is less than a preset pressure value, and conducting the pressure relief pipeline when the pressure of the pressure relief pipeline is.
Furthermore, the crane further comprises a crane body and a plurality of horizontal supporting legs, the horizontal oil cylinders are arranged on the crane body, and the horizontal supporting legs are respectively connected with the horizontal oil cylinders and used for being close to or far away from the crane body under the driving of the horizontal oil cylinders.
The invention has the following beneficial effects:
the invention provides an oil cylinder bending-prevention overvoltage protection system, which is characterized in that a plurality of oil paths of a multi-way valve are respectively connected with a plurality of horizontal oil cylinders so as to supply oil to the plurality of horizontal oil cylinders, and meanwhile, a pressure relief pipeline is respectively connected with the plurality of horizontal oil cylinders so as to enable the pressure relief pipeline to be communicated with the horizontal oil cylinders, the pressure of the pressure relief pipeline is the pressure of the horizontal oil cylinders, a pressure cut-off valve is arranged on the pressure relief pipeline, when the pressure of the pressure relief pipeline is smaller than a preset pressure value, the horizontal oil cylinders are indicated to normally operate, at the moment, the pressure cut-off valve is selected to be in a blocking state, so that hydraulic oil in the horizontal oil; when horizontal hydro-cylinder is flexible to be obstructed, inevitably lead to the interior oil pressure of horizontal hydro-cylinder to uprise, thereby make pressure release pipeline oil pressure uprise, when pressure when the pressure of pressure release pipeline reaches or surpasss preset pressure value, the pressure trip valve is in the on-state, make the pressure release pipeline switch on, hydraulic oil accessible pressure release pipeline in the horizontal hydro-cylinder carries out the pressure release operation, hydraulic oil in avoiding the horizontal hydro-cylinder lasts to pile up and leads to the oil pressure too high, avoided the horizontal hydro-cylinder to stretch out and draw back by force and lead to the condition of skew or bending, protected horizontal hydro-cylinder effectively. Compared with the prior art, the oil cylinder bending-prevention overvoltage protection system provided by the invention has the advantages that the pressure relief pipeline is additionally arranged, the pressure stop valve is arranged on the pressure relief pipeline and selectively conducts or blocks the pressure relief pipeline according to the oil pressure, so that the oil pressure can be timely relieved when the oil pressure rises due to the fact that the horizontal oil cylinder is blocked due to stretching and retracting, the horizontal oil cylinder is prevented from being deviated or bent, the safety of the horizontal oil cylinder is improved, and the horizontal oil cylinder is effectively protected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic overall structural diagram of an oil cylinder bending-prevention overvoltage protection system according to a first embodiment of the invention;
FIG. 2 is a block diagram of the connections of the control assembly of FIG. 1;
FIG. 3 is a schematic structural diagram of the horizontal cylinder in FIG. 1;
fig. 4 is a schematic partial structural view of an oil cylinder bending-prevention overvoltage protection system according to a first embodiment of the invention;
fig. 5 is a schematic structural diagram of a crane according to a third embodiment of the present invention.
Icon: 100-oil cylinder bending-prevention overvoltage protection system; 110-horizontal oil cylinder; 111-cylinder body; 113-a piston; 115-a telescopic rod; 130-a multiplex valve; 131-oil path; 150-pressure relief pipeline; 151-a splitting section; 153-a manifold section; 155-pressure relief section; 170-pressure shut-off valve; 180-pressure sensor; 190-a control component; 191-a controller; 193-a relay; 200-a crane; 210-horizontal legs; 230-vehicle body.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships conventionally put on the products of the present invention when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly and may, for example, be 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Just as disclose in the background art, the horizontal landing leg of hoist among the prior art, can meet the flexible condition of hindering occasionally when flexible, if not in time handle, horizontal landing leg can be flexible by force under the hydraulic pressure effect, and because its hindering effect point does not coincide with flexible direction for horizontal landing leg can receive the ascending power of vertical direction, and then makes horizontal landing leg take place to squint or crooked, light then leads to the unable normal work of equipment, heavy then leads to the incident.
In the prior art, aiming at the problems, the common method is that an overflow valve and a single valve are connected on an oil path from a multi-way valve to a horizontal oil cylinder, but the pressure relief function can not be achieved, the overflow valve is easy to generate pressure overshoot, and the protection function cannot be achieved. According to the invention, the pressure relief pipeline is arranged, the pressure stop valve is arranged on the pressure relief pipeline, and when the pressure in the pressure relief pipeline reaches a preset pressure value, the pressure stop valve is opened, so that the horizontal oil cylinder can perform pressure relief operation through the pressure relief pipeline, the pressure in the horizontal oil cylinder is reduced, and the horizontal oil cylinder is prevented from shifting or bending caused by forced expansion and contraction.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.
First embodiment
Referring to fig. 1 and fig. 2 in combination, the present embodiment provides an oil cylinder bending-prevention overvoltage protection system 100, which can timely release pressure, prevent the oil cylinder from being forcibly stretched, and effectively protect the oil cylinder.
The oil cylinder bending-prevention overvoltage protection system 100 provided by the embodiment comprises a plurality of horizontal oil cylinders 110, a multi-way valve 130, a pressure relief pipeline 150, a pressure cut-off valve 170, a pressure sensor 180 and a control assembly 190, the multi-way valve 130 is provided with a plurality of oil ways 131, the oil ways 131 are connected with the horizontal oil cylinders 110 in a one-to-one correspondence manner, one end of the pressure relief pipeline 150 is connected with the horizontal oil cylinders 110 respectively, the other end of the pressure relief pipeline 150 is used for pressure relief, the pressure cut-off valve 170 is arranged on the pressure relief pipeline 150, the pressure cut-off valve 170 is used for plugging the pressure relief pipeline 150 when the pressure of the pressure relief pipeline 150 is smaller than a preset pressure value, and the pressure relief pipeline 150 is conducted. The pressure sensor 180 is disposed on the pressure relief pipeline 150 and configured to detect a pressure on the pressure relief pipeline 150, and the pressure sensor 180 is further configured to generate a first pressure signal when the pressure on the pressure relief pipeline 150 is smaller than a preset pressure value, and generate a second pressure signal when the pressure on the pressure relief pipeline 150 is greater than or equal to the preset pressure value. The control assembly 190 is electrically connected to the pressure sensor 180 and the pressure cut-off valve 170, and is configured to control the pressure cut-off valve 170 to block the pressure relief pipeline 150 according to a first pressure signal, and further control the pressure cut-off valve 170 to open the pressure relief pipeline 150 according to a second pressure signal.
In this embodiment, the horizontal oil cylinder 110 is an oil cylinder disposed on the crane 200 and used for extending and retracting the horizontal supporting leg 210, the multi-way valve 130 is connected to an external oil inlet pipeline, hydraulic oil enters the horizontal oil cylinders 110 through the oil passages 131 after passing through the multi-way valve 130, and the horizontal oil cylinders 110 drive the horizontal supporting leg 210 to extend and retract, so as to support the crane 200. The specific structure can be seen in the horizontal leg 210 of the existing crane 200. Of course, the horizontal cylinder 110 may be a cylinder at other positions and on other apparatuses, such as a telescopic cylinder of a telescopic arm of an excavator, or a lift cylinder of a lift, and the like, and is not limited in detail herein.
It should be noted that, since the pressure relief pipeline 150 is connected to the horizontal cylinder 110, so that the horizontal cylinder 110 is communicated with the pressure relief pipeline 150, that is, the internal pressure value of the horizontal cylinder 110 is the same as the pressure value on the pressure relief pipeline 150, the pressure sensor 180 substantially detects the pressure value of the horizontal cylinder 110.
In this embodiment, the pressure sensor 180 may be an electronic pressure gauge, which is directly installed on the pressure relief pipeline 150, and can directly detect the pressure value of the pressure relief pipeline 150, generate a corresponding first pressure signal or second pressure signal, and transmit the first pressure signal or second pressure signal to the control component 190.
The control assembly 190 comprises a controller 191 and a relay 193, the relay 193 is electrically connected with the pressure cut-off valve 170, the controller 191 is respectively electrically connected with the pressure sensor 180 and the relay 193 and used for controlling the relay 193 to supply power according to a first pressure signal so that the pressure cut-off valve 170 blocks the pressure relief pipeline 150, and the controller 191 is also used for controlling the relay 193 to be powered off according to a second pressure signal so that the pressure cut-off valve 170 conducts the pressure relief pipeline 150.
In this embodiment, the pressure cut-off valve 170 is an electromagnetic valve, the relay 193 is arranged on a power supply line of the electromagnetic valve, the electromagnetic valve plays a role of a switch, when the controller 191 receives a first pressure signal, the relay 193 is controlled to supply power, the pressure cut-off valve 170 is in a normally energized state, the pressure cut-off valve 170 blocks the pressure relief pipeline 150, and the horizontal oil cylinder 110 normally stretches out and draws back. When the controller 191 receives the second pressure signal, the control relay 193 is powered off, so that the pressure cut-off valve 170 is in a power-off state, the pressure cut-off valve 170 is enabled to conduct the pressure relief pipeline 150, hydraulic oil is unloaded through the pressure relief pipeline 150, and the horizontal oil cylinder 110 is protected.
In this embodiment, the preset pressure value is 5 MPa. Specifically, when the pressure values of the pressure relief pipeline 150 and the horizontal cylinder 110 reach 5MPa, the pressure relief pipeline 150 is conducted to unload, and otherwise, the pressure relief pipeline normally stretches. Of course, the preset pressure value is set according to the specific size of the horizontal cylinder 110, and in other preferred embodiments, the preset pressure value may be other values, such as 8MPa or 10 MPa.
It should be noted that the pressure value mentioned in the present embodiment refers to the internal pressure, which can indicate the magnitude of the pressure applied in the unit area.
Referring to fig. 3, each horizontal cylinder 110 includes a cylinder body 111, a piston 113 and a telescopic rod 115, the piston 113 is disposed in the cylinder body 111, the telescopic rod 115 extends into the cylinder body 111 and is connected to one side of the piston 113, an oil chamber is formed between one side of the piston 113 away from the telescopic rod 115 and the inner wall of the cylinder body 111, and an oil path 131 and a pressure relief pipeline 150 are respectively communicated with the oil chamber.
In this embodiment, the oil path 131 is communicated with one side of the oil chamber, the pressure relief pipeline 150 is communicated with the other side of the oil chamber, the cylinder body 111 is cylindrical, the piston 113 is cylindrical and can be sealed in the cylinder body 111, and the telescopic rod 115 is connected with the external horizontal leg 210 for driving the horizontal leg 210 to open or close. Of course, the cylinder body 111 may be a rectangular cylinder or a triangular cylinder, and the shape of the piston 113 is matched with that of the cylinder body 111, which is not limited herein.
It should be noted that, in the present embodiment, the thickness of the piston 113 in the extending and contracting direction should be at least 1/3 of the cylinder body 111, so as to avoid the easy deviation phenomenon caused by the over-thin piston 113.
In this embodiment, a load relief device is disposed at an end of the pressure relief pipeline 150 away from the horizontal cylinder 110, and the load relief device is configured to receive hydraulic oil flowing out from the pressure relief pipeline 150. Specifically, the unloading device is for connecing the oil tank, and it can receive the hydraulic oil that overflows when horizontal cylinder 110 pressure is too big, and simultaneously, connects the oil tank and still is connected with the circulating line, can carry out cyclic utilization with the hydraulic oil of pressure release.
Referring to fig. 4, the pressure relief pipeline 150 includes a plurality of flow dividing segments 151, a flow collecting segment 153, and a pressure relief segment 155, the flow dividing segments 151 are all connected to the horizontal cylinder 110, the flow collecting segment 153 is connected to the flow dividing segments 151, respectively, one end of the pressure relief segment 155 is connected to the flow collecting segment 153, and the pressure cut-off valve 170 and the pressure sensor 180 are both disposed on the pressure relief segment 155.
To sum up, this embodiment provides a hydro-cylinder bending-prevention overvoltage protection system 100, and its theory of operation is as follows: when the horizontal oil cylinder 110 is not blocked in extension, the pressure sensor 180 detects a lower pressure value in the pressure relief pipeline 150 and generates a first pressure signal, the controller 191 receives the first pressure signal and then controls the relay 193 to supply power, so that the pressure cut-off valve 170 is always in a blocking state, the pressure relief pipeline 150 is blocked, and the horizontal oil cylinder 110 is normally extended; when horizontal cylinder 110 is flexible obstructed, the pressure in the oil chamber rises steeply, thereby make the increase of pressure value on the pressure release pipeline 150, when the pressure value reaches 5MPa, pressure sensor 180 detects the pressure value and generates the second pressure signal, controller 191 receives behind the second pressure signal control relay 193 and loses the electricity, thereby make pressure trip valve 170 lose the electricity and make pressure release pipeline 150 switch on, the hydraulic oil in the oil chamber carries out the pressure release through pressure release pipeline 150 under the pressure effect this moment, the oil pressure in the oil chamber has been reduced, horizontal cylinder 110 has been avoided flexible and lead to the skew or crooked under the pressure effect by force, protect horizontal cylinder 110 effectively.
Second embodiment
The embodiment provides an oil cylinder overvoltage protection method, which is suitable for an oil cylinder bending-prevention overvoltage protection system 100 disclosed in the first embodiment, the oil cylinder bending-prevention overvoltage protection system 100 comprises a plurality of horizontal oil cylinders 110, a multi-way valve 130, a pressure relief pipeline 150, a pressure cut-off valve 170, a pressure sensor 180 and a control assembly 190, the multi-way valve 130 is provided with a plurality of oil paths 131, the plurality of oil paths 131 are connected with the plurality of horizontal oil cylinders 110 in a one-to-one correspondence manner, one end of the pressure relief pipeline 150 is respectively connected with the plurality of horizontal oil cylinders 110, the other end of the pressure relief pipeline 150 is used for pressure relief, the pressure cut-off valve 170 is arranged on the pressure relief pipeline 150, and the pressure cut-off valve 170 is used for plugging the pressure relief pipeline 150 when the pressure of the pressure relief pipeline 150 is smaller than a preset pressure. The pressure sensor 180 is disposed on the pressure relief pipeline 150 and configured to detect a pressure on the pressure relief pipeline 150, and the pressure sensor 180 is further configured to generate a first pressure signal when the pressure on the pressure relief pipeline 150 is smaller than a preset pressure value, and generate a second pressure signal when the pressure on the pressure relief pipeline 150 is greater than or equal to the preset pressure value. The control assembly 190 is electrically connected to the pressure sensor 180 and the pressure cut-off valve 170, and is configured to control the pressure cut-off valve 170 to block the pressure relief pipeline 150 according to a first pressure signal, and further control the pressure cut-off valve 170 to open the pressure relief pipeline 150 according to a second pressure signal.
The oil cylinder overpressure protection method provided by the embodiment comprises the following steps:
s1: the pressure in the pressure relief line 150 is sensed.
Specifically, the pressure of the pressure relief line 150 is detected by a pressure sensor 180 provided on the pressure relief line 150, and the generated pressure signal is transmitted to the control assembly 190.
When the pressure of the pressure relief pipeline 150 is smaller than the preset pressure value, step S2 is executed: the pressure relief line 150 is plugged.
Specifically, when the pressure of the pressure relief pipeline 150 is smaller than a preset pressure value, the pressure relief pipeline 150 is blocked by the pressure cut-off valve 170, and at this time, the horizontal oil cylinder 110 normally extends and retracts.
When the pressure of the pressure relief pipeline 150 is greater than or equal to the preset pressure value, executing step S3: the pressure relief line 150 is opened.
Specifically, when the pressure of the pressure relief pipeline 150 is greater than or equal to a preset pressure value, the pressure relief pipeline 150 is conducted through the pressure cut-off valve 170, and at this time, the horizontal oil cylinder 110 is relieved through the pressure relief pipeline 150.
Third embodiment
Referring to fig. 5, the present embodiment provides a crane 200, which includes a crane body 230, a plurality of horizontal legs 210 and a cylinder bending-prevention overpressure protection system 100, the basic structure and principle of the cylinder bending-prevention overpressure protection system 100 and the technical effects thereof are the same as those of the first embodiment, and for the sake of brief description, reference may be made to the corresponding contents of the first embodiment where no part is mentioned in the present embodiment.
The oil cylinder bending-prevention overvoltage protection system 100 comprises a plurality of horizontal oil cylinders 110, a multi-way valve 130, a pressure relief pipeline 150 and a pressure cut-off valve 170, the multi-way valve 130 is provided with a plurality of oil ways 131, the oil ways 131 are connected with the horizontal oil cylinders 110 in a one-to-one manner, one end of the pressure relief pipeline 150 is respectively connected with the horizontal oil cylinders 110, the other end of the pressure relief pipeline 150 is used for pressure relief, the pressure cut-off valve 170 is arranged on the pressure relief pipeline 150, the pressure cut-off valve 170 is used for plugging the pressure relief pipeline 150 when the pressure of the pressure relief pipeline 150 is smaller than a preset pressure value, and the pressure relief pipeline 150 is conducted when the pressure.
The plurality of horizontal oil cylinders 110 are arranged on the vehicle body 230, and the plurality of horizontal supporting legs 210 are respectively connected with the plurality of horizontal oil cylinders 110 and are driven by the horizontal oil cylinders 110 to be close to or far away from the vehicle body 230.
In the crane 200 according to the present embodiment, the pressure release line 150 having the pressure cut-off valve 170 is connected to the horizontal cylinder 110, and the pressure can be released through the pressure release line 150, thereby preventing the horizontal leg 210 from being bent or displaced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an oil cylinder prevents curved overvoltage protection system, its characterized in that, includes a plurality of horizontal oil cylinders, multiple unit valve, pressure release pipeline and pressure trip valve, the multiple unit valve has a plurality of oil circuits, and is a plurality of oil circuit one-to-one ground and a plurality of horizontal oil cylinder connects, the one end of pressure release pipeline is respectively with a plurality of horizontal oil cylinder connects, the other end of pressure release pipeline is used for the pressure release, the pressure trip valve sets up on the pressure release pipeline, the pressure trip valve is used for the shutoff when the pressure value of pressure release pipeline is less than preset pressure value the pressure release pipeline, and the pressure value of pressure release pipeline is greater than or equal to switch on when presetting the pressure value the pressure release pipeline.
2. The oil cylinder bending-prevention overvoltage protection system according to claim 1, further comprising a pressure sensor and a control component, wherein the pressure sensor is arranged on the pressure relief pipeline and used for detecting a pressure value on the pressure relief pipeline, the pressure sensor is further used for generating a first pressure signal when the pressure value of the pressure relief pipeline is smaller than a preset pressure value, and generating a second pressure signal when the pressure value of the pressure relief pipeline is larger than or equal to the preset pressure value;
the control assembly is respectively connected with the pressure sensor and the pressure stop valve electrically and is used for controlling the pressure stop valve to block the pressure relief pipeline according to the first pressure signal and controlling the pressure stop valve to conduct the pressure relief pipeline according to the second pressure signal.
3. The oil cylinder bending-prevention overvoltage protection system according to claim 2, characterized in that the control assembly comprises a controller and a relay, the relay is electrically connected with the pressure cut-off valve, the controller is respectively electrically connected with the pressure sensor and the relay for controlling the power supply of the relay according to the first pressure signal, so that the pressure cut-off valve blocks the pressure release pipeline, and the controller is also used for controlling the power off of the relay according to the second pressure signal, so that the pressure cut-off valve is conducted to the pressure release pipeline.
4. The oil cylinder bending-prevention overpressure protection system as claimed in claim 1, wherein the preset pressure value is 5 MPa.
5. The oil cylinder bending-prevention overpressure protection system as claimed in claim 1, wherein each horizontal oil cylinder includes an oil cylinder body, a piston and a telescopic rod, the piston is disposed in the oil cylinder body, the telescopic rod extends into the oil cylinder body and is connected with one side of the piston, an oil cavity is formed between one side of the piston, which is far away from the telescopic rod, and the inner wall of the oil cylinder body, and the oil channel and the pressure relief pipeline are respectively communicated with the oil cavity.
6. The oil cylinder bending-prevention overpressure protection system as claimed in claim 1, wherein a load relief device is arranged at one end of the pressure relief pipeline, which is far away from the horizontal oil cylinder, and the load relief device is used for receiving hydraulic oil flowing out of the pressure relief pipeline.
7. The oil cylinder bending-prevention overvoltage protection system according to claim 1, wherein the pressure relief pipeline comprises a plurality of shunting sections, a flow collecting section and a pressure relief section, the shunting sections are all connected with the horizontal oil cylinder, the flow collecting section is respectively connected with the shunting sections, one end of the pressure relief section is connected with the flow collecting section, and the pressure cut-off valve is arranged on the pressure relief section.
8. A cylinder overpressure protection method, which is suitable for the cylinder bending-prevention overpressure protection system according to any one of claims 1 to 7, and is characterized by comprising the following steps:
detecting the pressure of a pressure relief pipeline;
when the pressure of the pressure relief pipeline is smaller than a preset pressure value, the pressure relief pipeline is blocked;
and when the pressure of the pressure relief pipeline is greater than or equal to the preset pressure value, the pressure relief pipeline is conducted.
9. A crane, characterized in that it comprises a cylinder bend over-pressure protection system according to any of claims 1-7.
10. The crane according to claim 9, further comprising a crane body and a plurality of horizontal legs, wherein the plurality of horizontal cylinders are disposed on the crane body, and the plurality of horizontal legs are respectively connected to the plurality of horizontal cylinders for moving toward or away from the crane body under the driving of the horizontal cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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