CN114294274B - Hydraulic elevator control system and control method - Google Patents
Hydraulic elevator control system and control method Download PDFInfo
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- CN114294274B CN114294274B CN202111457489.1A CN202111457489A CN114294274B CN 114294274 B CN114294274 B CN 114294274B CN 202111457489 A CN202111457489 A CN 202111457489A CN 114294274 B CN114294274 B CN 114294274B
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Abstract
The invention discloses a hydraulic elevator control system and a control method, belonging to the technical field of petroleum drilling equipment; the system comprises a first reversing electromagnetic valve for controlling the opening/closing of the elevator, a control oil way for controlling the opening/closing of the elevator through the first reversing electromagnetic valve, and an execution oil cylinder for driving through the control oil way, wherein the opening/closing of the elevator is controlled through the execution oil cylinder; the hydraulic elevator control system and the control method solve the problems that the traditional hydraulic elevator usually adopts a mechanical arm or a manual operation mode, the opening and closing efficiency of the elevator is effectively improved through hydraulic control, and the hydraulic elevator control system has a better automation effect and higher operation efficiency for petroleum drilling site operation.
Description
Technical Field
The invention relates to a hydraulic elevator control system and a control method, and belongs to the technical field of petroleum drilling equipment.
Background
Hydraulic elevator is one of the key equipment for oil production. The function is mainly used for clamping the pipe columns such as a drill rod, an oil pipe, a sleeve pipe and the like, assisting other equipment and completing tripping operation of the drill string.
The hydraulic elevator in the prior art generally adopts a side-by-side door structure, and at present, in the domestic drilling and well repairing tripping operation, the applied elevator is mostly a mechanical manual elevator, and workers need to repeatedly and manually open and close the elevator in the operation, so that the degree of automation is low, the working efficiency is low, the operation labor intensity of the technical workers is high, and potential safety hazards exist. Along with the automation and unmanned drilling, the automatic control of the elevator is a necessary trend of development.
Disclosure of Invention
The invention aims at: aiming at the problems, the hydraulic elevator control system and the hydraulic elevator control method are provided, the designed elevator adopts hydraulic automatic control, the structure adopts a side-by-side combination door, the automation degree is high, the operation is convenient, and the on-site operation and the hoisting effect of a drill rod are facilitated.
The technical scheme adopted by the invention is as follows:
A hydraulic elevator control system, characterized by: the control oil way is used for controlling the opening/closing of the elevator, and the actuating oil cylinder is driven by the control oil way and controls the opening/closing of the elevator through the actuating oil cylinder;
the execution oil cylinder comprises a first oil cylinder and a second oil cylinder, and the first oil cylinder and the second oil cylinder are communicated with the control oil way in parallel;
The control oil way comprises an oil inlet end P and an oil return end T, a first oil way end and a second oil way end are arranged after the oil inlet end is communicated with the first reversing electromagnetic valve, and the first oil way end and the second oil way end are controlled to serve as the oil inlet end or the oil outlet end through the first reversing electromagnetic valve, so that the liquid circulation loop is controlled to realize the control of the expansion and contraction of the execution oil cylinder;
The control oil way is provided with a first direction valve which is arranged near the second oil way end, and the reversing of the first direction valve is triggered according to whether the drill rod enters into place or not, one state of the first direction valve is a one-way circulation state, and the first direction valve is in a normal communication state after reversing;
when the elevator is started, high-pressure oil enters from the first oil way end; when the elevator is closed, high-pressure oil enters from the second oil path end.
Further, a second direction valve is further arranged on the control oil path, the second direction valve is arranged close to the first oil path end, and the direction of the second direction valve is changed by the weight of the elevator, so that the second direction valve is opened/closed;
and a first one-way valve is arranged between pipelines outside the two end parts of the second direction valve, so that oil return is facilitated when the second oil path end T enters high-pressure oil.
Further, a first hydraulic control one-way valve is arranged on a pipeline where the end part of the first direction valve far away from the second oil path end T is located, and the hydraulic pressure of the first hydraulic control one-way valve is taken from the pipeline where the first oil path end flows into the actuating mechanism, so that the circulation of an oil path during oil return is realized.
Further, a third oil cylinder for controlling the first direction valve is arranged on one side of the first direction valve, and the opening and closing of the first direction valve can be controlled through the expansion and the contraction of the third oil cylinder;
a second hydraulic control one-way valve is further arranged at one end part of the third oil cylinder;
When high-pressure oil enters from the first oil way end, the second hydraulic control one-way valve is hydraulically taken from an oil inlet end for contraction of the third oil cylinder; when the high-pressure oil enters from the second oil path end, the oil path can directly enter the third oil cylinder to realize the extending action.
Further, the hydraulic direction valve is further arranged on the oil way of the opening signal switch and the closing signal switch, two ends of the opening signal switch and the closing signal switch are controlled to be correspondingly communicated with the first oil way end and the second oil way end respectively, and the opening/closing of the indication signal is realized by changing the internal oil pressure.
Further, on the oil path of high pressure oil entering from the first oil path end, a first sequence valve and a third hydraulic control one-way valve are further arranged on the oil path before the high pressure oil enters into the third oil cylinder, and the third hydraulic control one-way valve oil path is controlled through the first sequence valve.
Further, a third direction valve is communicated before an oil inlet end of the actuating mechanism when the elevator is opened, the third direction valve is controlled to be opened/closed through the first oil cylinder, and the third direction valve is communicated with an opening signal switch;
a fourth oil cylinder is further communicated between the first sequence valve and the second direction valve, a fourth direction valve is further communicated on an oil way close to the second oil way end, the fourth direction valve is controlled to be opened/closed through the fourth oil cylinder, and the fourth direction valve is communicated with a closing signal switch;
When the actuating mechanism is used for opening the elevator, the oil outlet end of the actuating mechanism is communicated with the other end of the fourth oil cylinder, so that the fourth oil cylinder can be reversely controlled when the second oil way end is used for oil inlet.
Further, when the actuating mechanism is used for opening the elevator, the oil outlet end of the actuating mechanism is communicated with the other end of the fourth oil cylinder, and a second sequence valve is further arranged in an oil way between the actuating mechanism and the fourth oil cylinder so as to control the closing signal switch after the actuating mechanism is closed.
Further, the device further comprises a turnover execution oil way, wherein the turnover execution oil way comprises a fifth oil cylinder, the fifth oil cylinder is sequentially connected in series with a first one-way throttle valve, a balance valve and a third sequence valve, and the third sequence valve is communicated to the front of an oil inlet end of the actuating mechanism when the actuating mechanism is used for opening the elevator so as to facilitate oil return when the elevator is controlled to be closed.
Further, a fourth sequence valve and a shuttle valve are further communicated in series among the oil path near the second oil path end, the fourth direction valve and the oil path between the closing signal switch, and the shuttle valve is further communicated with the balance valve.
Further, a throttle valve and a second one-way valve are also connected in series between the oil path between the fourth sequence valve and the shuttle valve and the oil path between the first sequence valve and the second direction valve.
Further, the first sequence valve and the third sequence valve are communicated with an oil way close to the second oil way end so as to facilitate oil return.
Further, the first oil path end is also communicated with a first pressure reducing overflow valve, a second reversing electromagnetic valve and a first overflow valve, and the first overflow valve is communicated with an oil return end T;
the second oil path end is also communicated with a second pressure-reducing overflow valve, a third reversing electromagnetic valve and a second overflow valve, and the second overflow valve is communicated with an oil return end T;
The first pressure reducing overflow valve and the second pressure reducing overflow valve are respectively provided with a bypass, and a third one-way valve and a fourth one-way valve are respectively arranged on the bypass so as to smoothly pass through when oil returns.
Further, the first oil cylinder is further provided with a second one-way throttle valve at the oil inlet end oil way of the executing and opening elevator.
A hydraulic elevator control method comprises the following steps of
Opening an elevator;
The electromagnet YV02 is powered on, the elevator starts a door opening command, the first reversing electromagnetic valve reverses, and when the elevator does not bear the weight of a drill rod, the second direction valve is in a connection state as a protection valve, and the elevator executes the door opening command; the high-pressure oil path passes through an oil inlet end P port, and is divided into two branches to flow after passing through a first pressure reducing overflow valve, and a branch-hydraulic direction valve is switched to enable a closing signal switch to be communicated with an oil return end T, so that pressure relief is finished, and a closing signal switch controls a closing signal lamp to be extinguished; the high-pressure oil of the branch circuit II flows to the fourth oil cylinder through the second direction valve, the fourth oil cylinder works to open the latch, and the latch is opened to cause the fourth direction valve to change direction, so that a door closing signal oil way is completely disconnected; after the latch is opened, the fourth oil cylinder is in a pressure holding state, the pressure of the high-pressure oil way is increased to reach the opening pressure of the first sequence valve, the first sequence valve is opened to enable the third hydraulic control one-way valve to be opened, and the high-pressure oil flows to five branches after passing through the third hydraulic control one-way valve: the first branch and the second branch respectively enter the first oil cylinder and the second oil cylinder, so that the oil cylinders move to perform door opening actions; the third branch flows to the third sequence valve, and as the door opening pressure is limited by the first pressure reducing overflow valve and the first overflow valve in the door opening action of the elevator, the first overflow valve is used as a second-stage pressure regulating valve to limit the door opening pressure to be lower than the set pressure of the third sequence valve, and the third branch oil way is stopped by the third sequence valve and does not advance; the fourth branch enters a third oil cylinder, and a second hydraulic control one-way valve is opened to enable the third oil cylinder to move, and the third oil cylinder has the function of resetting the drill rod triggering mechanism; the fifth branch enters a pilot cavity of the first hydraulic control one-way valve, so that the first hydraulic control one-way valve is opened, and oil return of the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder is completed through the first direction valve, the fourth one-way valve and the first reversing electromagnetic valve; triggering a third directional valve to change direction after the latch door is completely opened, enabling high-pressure oil to enter a door opening signal switch through the third directional valve, closing a door opening signal switch contact after the specified pressure is reached, and lighting a door opening signal lamp;
Closing the elevator;
Giving electromagnet YV03 power supply, starting a door closing instruction by the elevator, reversing by the first reversing electromagnetic valve, and dividing the high-pressure oil path into two branch flows after passing through the oil inlet end P port and the second pressure reducing overflow valve: the first branch circuit pushes the hydraulic direction valve to change direction, so that the door opening signal switch is communicated with the oil return end T, pressure relief is completed, and the door opening signal switch is extinguished; the second branch high-pressure oil flows to a fourth sequence valve, a fourth direction valve and a first direction valve, when a drill rod is put into the elevator, the first direction valve is reversed by the drill rod triggering mechanism; the high-pressure oil is divided into four branches after passing through the first direction valve and the first hydraulic control one-way valve: the first branch passes through the second hydraulic control one-way valve and then enters the third oil cylinder, and the third oil cylinder moves to enable the drill rod triggering mechanism to be in a contracted state, so that the triggering mechanism is prevented from being always propped against the drill rod and wearing the drill rod; the second branch and the third branch respectively enter the first oil cylinder and the second oil cylinder to enable the elevator to perform door closing action; the branch four flows to the fourth oil cylinder, the first oil cylinder and the second oil cylinder are in a pressure-holding state after the closing action of the door is completed, and after the pressure reaches the set value of the second sequence valve, the second sequence valve is opened and flows to the fourth oil cylinder to complete the closing action of the door latch; after the door latch is completely closed, the fourth direction valve is triggered, high-pressure oil flows to the door closing signal switch after reversing, after the pressure reaches a set value, the contact of the door closing signal switch is closed, and a door closing signal lamp is lighted; at the moment, the door closing pressure is limited by the second pressure reducing overflow valve and the second overflow valve, the second overflow valve is used as a second-stage pressure regulating valve to limit the door closing pressure to be lower than the set pressure of the fourth sequence valve, high-pressure oil does not advance after being cut off by the fourth sequence valve, but the high-pressure oil in the door closing signal switch can enter the pilot cavity of the balance valve through the shuttle valve, the balance valve is opened, hydraulic oil in the fifth oil cylinder flows to the third hydraulic control one-way valve and the first one-way valve through the first one-way throttle valve, the balance valve and the third sequence valve to finish oil return, and the floating function is realized.
Further, if there is no drill rod in the elevator, or the drill rod is not in place, i.e. the first directional valve does not complete reversing, at this time, a door closing command is given to the elevator, and the elevator will not close.
Further, the elevator overturning device also comprises an elevator overturning device;
When the elevator door is in an open state and needs to be turned up, a door opening signal is firstly given to enable YV02 to be powered on, then an electromagnet YV01 is simultaneously powered on, a second reversing electromagnetic valve reverses under the action of the electromagnet YV01, an oil way of a first relief valve is cut off, the door opening pressure is determined by the first relief valve, the set pressure of the first relief valve is larger than that of a third sequence valve, after high-pressure oil passes through the third hydraulic control one-way valve, the oil way passes through the third sequence valve, a balance valve and the first one-way throttle valve to a fifth oil cylinder, a jaw of an elevator main body starts to be turned up, YV01 is powered off when the elevator main body is in a proper position, and the elevator main body is opened and kept in the existing position.
Further, the elevator is forced to float;
If the valve needs to be turned down for adjustment after turning over, a door closing signal is firstly given to enable YV03 to be powered on, then YV04 is simultaneously given to be powered on, at the moment, a second overflow valve oil way is cut off, door closing pressure is set by a third reversing electromagnetic valve, a pressure set value of the third reversing electromagnetic valve is higher than that of a fourth sequence valve, when high-pressure oil flows to a first direction valve, because a drill rod does not exist in an elevator, a drill rod triggering mechanism cannot work, the high-pressure oil can only flow to the fourth sequence valve and the fourth sequence valve, and because door closing action is not completed, the valve is also in a cut-off state, after the fourth sequence valve is opened, the high-pressure oil enters a pilot cavity of a balance valve through a shuttle valve, the balance valve is opened, hydraulic oil in a fifth oil cylinder flows to a third hydraulic control one-way valve and the first one-way valve through a first one-way throttle valve, the balance valve and the third sequence valve to complete oil return, a floating function is realized, when the elevator begins to float and fall, YV04 is powered off when the elevator body is finely adjusted to a proper position, and the elevator body is kept at an existing position.
Further, the method also comprises a load protection;
When the elevator main body bears the weight of the drill rod, the second direction valve is triggered to be disconnected, the elevator door is in a closed state, even if the electromagnet YV02 is electrified at the moment, a door opening command is given, the elevator is still in a locking state, and the safety problem caused by misoperation is avoided.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. The hydraulic elevator control system and the control method solve the problems that the traditional hydraulic elevator usually adopts a mechanical arm or a manual operation mode, the opening and closing efficiency of the elevator is effectively improved through hydraulic control, and the hydraulic elevator control system has a more automatic effect and higher operation efficiency for petroleum drilling site operation;
2. according to the hydraulic elevator control system and the control method, the control on the opening or closing of the elevator is effectively realized through the design of the signal indicator lamp, the effective monitoring of the execution action state of the elevator is realized, and the automatic effect of the elevator is effectively improved under the condition of the mode;
3. the hydraulic elevator control system and the control method of the invention combine with the belt load protection and the design of ensuring the safety state in the execution process, effectively ensure the safety performance of the whole action of the elevator, and avoid unnecessary loss caused by incorrect operation, thereby ensuring the working efficiency of the elevator.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the flow direction of an oil path for opening a door of the elevator of the present invention.
Fig. 3 is a schematic diagram of the flow direction of the oil path of the elevator door of the present invention.
Fig. 4 is a schematic diagram of the flow direction of the oil path for the elevator of the present invention.
FIG. 5 is a schematic flow diagram of an oil circuit with an elevator of the present invention forced to float.
Fig. 6 is a schematic diagram of the flow direction of the oil path of the hanging clip belt protection of the present invention.
The marks in the figure: the oil return valve comprises a 1-solenoid valve block area, a 101-first reversing solenoid valve, a 102-first overflow valve, a 103-hydraulic direction valve, a 104-second reversing solenoid valve, a 105-first pressure reducing overflow valve, a 106-third one-way valve, a 107-fourth one-way valve, a 108-second pressure reducing overflow valve, a 109-third reversing solenoid valve, a 110-second overflow valve, a 111-first oil path end, a 112-second oil path end, a 201-opening signal switch, a 202-closing signal switch, a 3-hydraulic control valve block area, a 301-first one-way valve, a 302-second one-way valve, a 303-first one-way throttle valve, a 304-balance valve, a 305-throttle valve, a 306-shuttle valve, a 307-second sequence valve, a 308-fourth sequence valve, a 309-third sequence valve, a 310-third one-way valve, a 311-first hydraulic one-way valve, a 312-second one-way valve, a 313-first sequence valve, a 314-second one-way throttle valve, a 4-second direction valve, a 5-fifth oil cylinder, a 6-fourth one-way valve, a 7-third one-way valve, a 8-third direction oil cylinder, a third direction cylinder, a 8-third direction cylinder, a 11-direction cylinder, a third direction cylinder and a third direction cylinder.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
A hydraulic elevator control system, as shown in fig. 1 to 6, comprises a first reversing solenoid valve 101 for controlling the opening/closing of an elevator, a control oil path for controlling the opening/closing of the elevator through the first reversing solenoid valve 101, and an execution cylinder for driving through the control oil path, wherein the opening/closing of the elevator is controlled through the execution cylinder;
The execution oil cylinder comprises a first oil cylinder 9 and a second oil cylinder 10, and the first oil cylinder 9 and the second oil cylinder 10 are communicated with a control oil way in parallel;
the control oil way comprises an oil inlet end P and an oil return end T, a first oil way end 111 and a second oil way end 112 are arranged after the oil inlet end is communicated with the first reversing electromagnetic valve 101, and the first oil way end 111 and the second oil way end 112 are controlled to serve as the oil inlet end or the oil outlet end through the first reversing electromagnetic valve 1, so that the liquid circulation loop is controlled to realize the expansion and contraction of the control execution oil cylinder;
The control oil way is provided with a first direction valve 11, the first direction valve 11 is arranged near a second oil way end 112, the reversing of the first direction valve 11 is triggered according to whether a drill rod enters into place, one state of the first direction valve 11 is a one-way circulation state, and the first direction valve 11 is in a normal communication state after reversing;
When the elevator is started, high-pressure oil enters from the first oil path end 111; when the elevator is closed, high pressure oil enters from the second oil circuit end 112.
In this embodiment, taking the above and the following descriptions as references, the components on the pipeline responding with the references in the actual elevator action process are adopted, and the components and the pipeline are not affected when the elevator performs another action. In the above specific structural design, as the specific description of the oil way, the hydraulic control is adopted, so that the process of controlling the elevator by the oil way is forward or reverse flow, thereby controlling the expansion and contraction effect of the execution cylinder, and realizing the action of the execution cylinder due to the hydraulic difference at the two ends of the cylinder. For better expression, the specific structure and the laying of the oil path pipeline are mainly described by taking a main oil path as a description, and other branches can be implemented in further designs.
Through the design of the specific structure, the trouble brought by a field circuit is effectively avoided by realizing hydraulic control, meanwhile, the precise control of the elevator is further effectively improved, the safety performance of the whole elevator is realized, and the operation performance of the elevator is further improved.
In principle, in another embodiment, the control oil path is further provided with a second direction valve 4, the second direction valve 4 is disposed near the first oil path end 111, and the direction of the second direction valve 4 is changed by the weight of the elevator, so as to realize opening/closing of the second direction valve 4;
A first check valve 301 is disposed between the pipelines outside the two ends of the second direction valve 4, so that oil return is facilitated when the second oil path end 112 enters high-pressure oil.
In this design, the main purpose application of the second direction valve 4 is to realize better load protection, especially in the process of needing to open the door, the second direction valve 4 is triggered to be in a closed state due to the load condition, so that the door can not be opened effectively, and in the state of keeping closed, the door closing action can be continuously performed due to the arrangement of the first one-way valve 301, so that the load protection is effectively performed.
As a specific description, in this design, the second direction valve 4 is used as a passage in the closed and the closed states, but when the second direction valve 4 is subjected to a force, it is reversed, and the oil passage can only pass through the first check valve 301, and the oil return process for closing the door, that is, can only perform the closing operation, and even if the door opening signal is given, the second direction valve 4 is in the open state at this time, so that the load protection is realized by the second direction valve 4.
As a more specific design, the pipeline where the end part of the first direction valve 11 far away from the second oil path end is provided with a first hydraulic control one-way valve 311, and the hydraulic pressure of the first hydraulic control one-way valve 311 is taken from the pipeline where the first oil path end 111 flows into the actuating mechanism, so as to realize the circulation of the oil path during oil return. The mode can effectively ensure that the oil paths of the device can carry out different flow directions when different actions are executed.
On the basis of a more specific design, a third oil cylinder 12 for controlling the first direction valve 11 is further arranged on one side of the first direction valve 11, and the opening and closing of the first direction valve 11 can be controlled through the expansion and the contraction of the third oil cylinder 12;
a second hydraulic control one-way valve 312 is also arranged at one end part of the third oil cylinder 12;
when high pressure oil enters from the first oil passage end 111, the second hydraulic control check valve 312 is hydraulically taken from the oil inlet end for contraction of the third cylinder 12; when high-pressure oil enters from the second oil path end 112, the oil path can directly enter the third oil cylinder 12 to realize the extending action.
In the design of the structure, the third oil cylinder 12 can effectively control the trigger mechanism to stretch and retract, particularly under the condition of putting a drill rod, the mode can effectively ensure that the drill rod enters into place, and simultaneously effectively avoid the trigger mechanism from contacting with the drill rod for a long time.
The expansion and contraction of the third oil cylinder 12 controls the first direction valve 11, when the drill rod contacts the trigger mechanism, the third oil cylinder 12 is extended, the first direction valve 11 is triggered to open a passage, the passage of a door closing oil way is promoted, the third oil cylinder 12 can drive the trigger mechanism to shrink under the action of hydraulic pressure after the passage, the trigger mechanism is restored to the original position, and the first direction valve 11 keeps the original state under the action of the trigger mechanism, so that the whole door closing action is continuously completed; when the door is opened, the drill rod is taken out, the trigger mechanism is not affected by the drill rod, meanwhile, the third oil cylinder 12 is in a contracted state under the action of oil pressure, and the first direction valve 11 is in a state of a one-way passage, so that oil return in the door opening process is facilitated. The first directional valve 11 differs from the second directional valve 4 in that the commutation of the first directional valve 11 is a free path and a unidirectional path; the commutation of the second directional valve 4 is a free path and open circuit commutation.
On the basis of the design of the specific structure, the hydraulic directional valve 103 is further arranged on the oil path of the opening signal switch 201 and the closing signal switch 202, and the two ends corresponding to the opening signal switch 201 and the closing signal switch 202 are controlled to be respectively communicated with the first oil path end 111 and the second oil path end 112, so that the opening/closing of the indication signal is realized by changing the internal oil pressure. In the design of this structure, its specific design is mainly in order to better show the state of closing the door or opening the door, provides more accurate suggestion for the operator, need not the artificial observation to the elevator actual conditions again.
Based on the design of the above embodiment, as a further design, in the implementation of another embodiment, on the oil path of the high-pressure oil entering from the first oil path end 111, the first sequence valve 313 and the third pilot check valve 310 are further disposed on the oil path before the high-pressure oil enters into the third cylinder 12, and the oil path of the third pilot check valve 310 is controlled by the first sequence valve 313. The design of this structure is mainly to ensure the oil pressure to realize the action of the fourth oil cylinder 6, thereby controlling the disconnection of the closing signal switch 202 and realizing the communication of the opening signal switch 201.
As a more specific design, a third direction valve 8 is further communicated before an oil inlet end of the actuating mechanism when the elevator is opened, the third direction valve 8 is controlled to be opened/closed by a first oil cylinder, and the third direction valve 8 is communicated with an opening signal switch 201;
A fourth cylinder 6 is further communicated between the first sequence valve 313 and the second direction valve 4, a fourth direction valve 7 is further communicated on an oil path close to the second oil path end 112, the fourth direction valve 7 is controlled to be opened/closed by the fourth cylinder 6, and the fourth direction valve 7 is communicated with a closing signal switch 202;
When the actuating mechanism is used for opening the elevator, the oil outlet end of the actuating mechanism is communicated with the other end of the fourth oil cylinder 6, so that the fourth oil cylinder 6 can be reversely controlled when the second oil path end 112 is used for oil feeding.
Based on the above specific structure, as a more specific design, when the actuator is used for opening the elevator, the oil outlet end of the actuator is communicated with the other end of the fourth cylinder 6, and the oil path between the actuator and the fourth cylinder is further provided with a second sequence valve 307 so as to control the closing signal switch 202 after the elevator is closed.
In this process, the fourth cylinder 6 is used to open and close the fourth direction valve 7, when the door opening signal is sent, based on the above structural design, the fourth cylinder 6 is contracted, after contraction, the direction of the fourth direction valve 7 is triggered to disconnect the oil path, and the oil path continuously enters the first cylinder 9 and the second cylinder 10, at this time, the first cylinder 9 and the second cylinder 10 are in an extended state, which can realize the door opening action, and in synchronization, the extension of the first cylinder 9 triggers the direction of the third direction valve 8, at this time, the third direction valve 8 is in a path state, thereby realizing the opening of the door opening signal.
When the door is closed, the oil way is in the reverse direction, and at the moment, the oil way of the fourth oil cylinder 6 is in the reverse direction, and the second one-way throttle valve 314 is arranged on the passage of the first oil cylinder 9, so that the oil way firstly enters the fourth oil cylinder 6 to realize the extension of the fourth oil cylinder 6, and after the extension, the fourth direction valve 7 is reversed to realize the communication of the oil way; in synchronization, the first oil cylinder 9 and the second oil cylinder 10 are in a contracted state, so that a door closing action is performed, when the first oil cylinder 9 contracts, the third direction valve 8 reverses, and is in an open circuit state, so that a door opening signal is closed, and a door closing signal is opened.
The principle of reversing the second direction valve 4, the third direction valve 8, the fourth direction valve 7 is the same here, both being the reversing of the free path and the open path, while the reversing of the first direction valve 11 is the reversing of the free path and the unidirectional path.
As a further design, more specific, the device further comprises a turnover execution oil way, wherein the turnover execution oil way comprises a fifth oil cylinder 5, and the fifth oil cylinder is sequentially connected in series with a first one-way throttle valve 303, a balance valve 304 and a third sequence valve 309, and is communicated to the front of an oil inlet end when an executing mechanism is used for opening the elevator through the third sequence valve so as to be convenient for returning oil when the elevator is controlled to be closed. The fifth oil cylinder 5 can realize overturning according to the condition of oil pressure, and particularly in the structural design, an automatic pressure relief process is adopted, and the pressure relief process can realize floating downwards under the action of gravity.
Based on the design of the specific structure, a fourth sequence valve 308 and a shuttle valve 306 are also connected in series between the oil path near the second oil path end 112, the oil path between the fourth direction valve 7 and the closing signal switch 202, and the shuttle valve 306 is also connected with the balance valve 304.
Further, in the preferred design, specifically, a throttle valve 305 and a second check valve 302 are connected in series between the oil path between the fourth sequence valve 308 and the shuttle valve 306 and the oil path between the first sequence valve 313 and the second direction valve 4.
As a more specific design, further, the first sequence valve 313 and the third sequence valve 309 communicate with an oil path near the second oil path end 112 to facilitate oil return.
In the whole signal acquisition and oil path control realization design, the first oil path end 111 is further communicated with a first pressure reducing and overflow valve 105, a second reversing electromagnetic valve 104 and a first overflow valve 102, and the first overflow valve 102 is communicated with an oil return end T;
The second oil path end 112 is further communicated with a second pressure reducing overflow valve 108, a third reversing electromagnetic valve 109 and a second overflow valve 110, and the second overflow valve 110 is communicated with an oil return end T;
the first relief valve 105 and the second relief valve 108 are both provided with bypasses, and a third check valve 106 and a fourth check valve 107 are respectively provided on the bypasses for smooth passage in oil return.
More specifically, the first oil cylinder 9 is further provided with a second one-way throttle 314 at the oil inlet end oil path for opening the elevator.
As a design of the above specific structure, specifically describing that in the region 1, the valve blocks are all electrically controlled valve blocks, wherein the valves 101, 104, 109 are solenoid valves, 102, 110 are relief valves, 103 are directional valves, 105, 108 are pressure reducing/relief valves, and 106, 107 are check valves;
201 and 202 are pressure switches;
Other valve blocks include hydraulic control valve blocks in region 3.
The method of use thereof and the control method implemented to the whole structure will be presented one by one.
Example 2
A hydraulic elevator control method comprising the steps of:
opening an elevator;
As shown in fig. 2, the electromagnet YV02 is powered on, the elevator starts a door opening command, the first reversing electromagnetic valve 101 reverses, and when the elevator does not bear the weight of a drill rod, the second directional valve 4 is in an on state as a protection valve, and the elevator executes the door opening command; the high-pressure oil path passes through an oil inlet end P port and is divided into two branches to flow after passing through a first pressure reducing overflow valve 105, a branch-hydraulic direction valve 103 is reversed, a closing signal switch 202 is communicated with an oil return end T to finish pressure relief, and a closing signal switch 202 controls a closing signal lamp to be turned off; the high-pressure oil of the second branch flows to the fourth oil cylinder 6 through the second direction valve 4, the fourth oil cylinder 6 works to open a latch, and the latch is opened to cause the fourth direction valve 7 to change direction, so that a door closing signal oil way is thoroughly disconnected; after the latch is opened, the fourth oil cylinder 6 is in a pressure-holding state, the pressure of the high-pressure oil line is increased to reach the opening pressure of the first sequence valve 313, the third hydraulic control one-way valve 310 is opened after the first sequence valve 313 is opened, and the high-pressure oil flows to five branches again after passing through the third hydraulic control one-way valve 310: the first branch and the second branch respectively enter the first oil cylinder 9 and the second oil cylinder 10, so that the oil cylinders move to perform door opening actions; the third branch flows to the third sequence valve 309, and as the door opening pressure is limited by the first pressure reducing overflow valve 105 and the first overflow valve 102 in the door opening action of the elevator, the first overflow valve 102 is used as a secondary pressure regulating valve to limit the door opening pressure to be lower than the set pressure of the third sequence valve 309, and the third branch oil passage is not advanced after being blocked by the third sequence valve 309; the fourth branch enters the third oil cylinder 12, the second hydraulic control one-way valve 312 is opened, the third oil cylinder 12 moves, and the third oil cylinder 12 has the function of resetting the drill rod triggering mechanism; the fifth branch enters a pilot cavity of the first hydraulic control one-way valve 311, so that the first hydraulic control one-way valve 311 is opened, and oil return of the first oil cylinder 9, the second oil cylinder 10, the third oil cylinder 12 and the fourth oil cylinder 6 is completed through the first direction valve 11, the fourth one-way valve 107 and the first reversing electromagnetic valve 101; triggering the third direction valve 8 to change direction after the latch door is completely opened, enabling high-pressure oil to enter the door opening signal switch 201 through the third direction valve 8, closing contacts of the door opening signal switch 201 after the specified pressure is reached, and lighting a door opening signal lamp;
Closing the elevator;
As shown in fig. 3, the electromagnet YV03 is powered, the elevator starts a door closing command, the first reversing electromagnetic valve 101 reverses, and the high-pressure oil path passes through the oil inlet port P and is divided into two branches after passing through the second pressure-reducing overflow valve 108 to flow: the first branch circuit pushes the hydraulic direction valve 103 to change direction, so that the door opening signal switch 201 and the oil return end T are connected, pressure relief is completed, and the door opening signal switch 201 is extinguished; the high-pressure oil of the branch II flows to the fourth sequence valve 308, the fourth direction valve 7 and the first direction valve 11, and when a drill rod is put into the elevator, the first direction valve 11 is reversed by the drill rod triggering mechanism; the high-pressure oil is divided into four branches again after passing through the first directional valve 11 and the first hydraulic control one-way valve 311: the first branch passes through the second hydraulic control one-way valve 312 and then enters the third oil cylinder 12, and the third oil cylinder 12 moves to enable the drill rod trigger mechanism to be in a contracted state, so that the trigger mechanism is prevented from being always propped against the drill rod and wearing the drill rod; the second branch and the third branch respectively enter a first oil cylinder 9 and a second oil cylinder 10, so that the elevator performs door closing action; the branch four flows to the fourth oil cylinder 6, the first oil cylinder 9 and the second oil cylinder 10 are in a pressure-holding state after the closing action is completed, after the pressure reaches the set value of the second sequence valve 307, the second sequence valve 307 is opened, and flows to the fourth oil cylinder 6, so that the closing action of a latch is completed; after the door latch is completely closed, the fourth direction valve 7 is triggered, high-pressure oil flows to the door closing signal switch 202 after reversing, after the pressure reaches a set value, the contact of the door closing signal switch 202 is closed, and a door closing signal lamp is lightened; at this time, the closing pressure is limited by the second pressure reducing relief valve 108 and the second relief valve 110, the second relief valve 110 acts as a secondary pressure regulating valve, so that the closing pressure is lower than the set pressure of the fourth sequence valve 308, the high-pressure oil does not advance after being blocked by the fourth sequence valve 308, but the high-pressure oil in the closing signal switch 202 can enter the pilot cavity of the balance valve 304 through the shuttle valve 306, the balance valve 304 is opened, and the hydraulic oil in the fifth oil cylinder 5 flows to the third pilot check valve 310 and the first check valve 301 through the first check throttle valve 303, the balance valve 304 and the third sequence valve 309 to complete oil return, thereby realizing the floating function.
In the specific method, especially in the process of closing the elevator, if the elevator has no drill rod or the drill rod is not placed in place, that is, the first directional valve 11 does not complete reversing, a door closing command is given, and the elevator is not closed.
Example 3
Taking fig. 4 as an example on the basis of the design of the embodiment 2, the elevator overturning device also comprises an elevator overturning device;
When the elevator door is in an open state and needs to be turned up, a door opening signal is firstly given to enable YV02 to be powered up, then an electromagnet YV01 is simultaneously powered up, a second reversing electromagnetic valve 104 reverses under the action of the electromagnet YV01, an oil way of the first overflow valve 102 is cut off, at the moment, the door opening pressure is determined by the first pressure reducing overflow valve 105, the set pressure of the first pressure reducing overflow valve 105 is larger than that of the third sequence valve 309, after high-pressure oil passes through the third hydraulic control one-way valve 310, the oil way passes through the third sequence valve 309, the balance valve 304 and the first one-way throttle valve 303 to the fifth oil cylinder 5, the jaw of the main body of the elevator starts to be turned up, the YV01 is powered down when the jaw of the main body of the elevator is in a proper position, and the main body of the elevator is opened and kept in the existing position.
Example 4
Taking fig. 5 as an example, the design base of the embodiment 2 and the embodiment 3 further comprises an elevator forced floating;
If the valve is required to be turned down for adjustment after turning over, firstly, a door closing signal is given to enable YV03 to be powered on, then YV04 is powered on simultaneously, at this time, an oil way of the second overflow valve 110 is cut off, the door closing pressure is set by the third reversing electromagnetic valve 109, the pressure setting value of the third reversing electromagnetic valve 109 is higher than that of the fourth sequence valve 308, when high-pressure oil flows to the first direction valve 11, because a drill rod does not exist in the elevator, a drill rod triggering mechanism cannot work, the high-pressure oil can only flow to the fourth sequence valve 308 and the fourth direction valve 7, and because the door closing action is not completed, the valve 7 is also in a cut-off state, after the fourth sequence valve 308 is opened, the high-pressure oil enters a pilot cavity of the balance valve 304 through the shuttle valve 306, the balance valve 304 is opened, oil in the fifth oil cylinder 5 flows to the third hydraulic control one-way valve 310 and the first one-way valve 301 through the first one-way throttle valve 303, the balance valve 304 and the third sequence valve 309 to complete oil return, a floating function is realized, the elevator begins to float and falls, when the elevator is finely tuned to a proper position, YV04 is deenergized, and the main body is kept at the existing position.
Specifically, the throttle valve 305 and the second check valve 302 mainly perform the pressure release function in this operation, so as to ensure that the elevator body is locked to the set position in time. Because of the floating performed in the open state, called forced floating
The design is more specific and further comprises a load protection;
When the elevator main body bears the weight of a drill rod, the second direction valve 4 is triggered to be disconnected, the elevator door is in a closed state, even if the electromagnet YV02 is electrified at the moment, a door opening command is given, the elevator is still in a locking state, and the safety problem caused by misoperation is avoided.
Example 5
A drilling rig comprising a hydraulic elevator control system of embodiment 1.
Example 6
A drilling rig comprising a hydraulic elevator control method as described in any one of embodiments 2 to 4.
To sum up:
1. The hydraulic elevator control system and the control method solve the problems that the traditional hydraulic elevator usually adopts a mechanical arm or a manual operation mode, the opening and closing efficiency of the elevator is effectively improved through hydraulic control, and the hydraulic elevator control system has a more automatic effect and higher operation efficiency for petroleum drilling site operation;
2. according to the hydraulic elevator control system and the control method, the control on the opening or closing of the elevator is effectively realized through the design of the signal indicator lamp, the effective monitoring of the execution action state of the elevator is realized, and the automatic effect of the elevator is effectively improved under the condition of the mode;
3. the hydraulic elevator control system and the control method of the invention combine with the belt load protection and the design of ensuring the safety state in the execution process, effectively ensure the safety performance of the whole action of the elevator, and avoid unnecessary loss caused by incorrect operation, thereby ensuring the working efficiency of the elevator.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (8)
1. A hydraulic elevator control system, characterized by: the control oil way is used for controlling the opening/closing of the elevator, and the actuating oil cylinder is driven by the control oil way and controls the opening/closing of the elevator through the actuating oil cylinder;
the execution oil cylinder comprises a first oil cylinder and a second oil cylinder, and the first oil cylinder and the second oil cylinder are communicated with the control oil way in parallel;
The control oil way comprises an oil inlet end P and an oil return end T, a first oil way end and a second oil way end are arranged after the oil inlet end is communicated with the first reversing electromagnetic valve, and the first oil way end and the second oil way end are controlled to serve as the oil inlet end or the oil outlet end through the first reversing electromagnetic valve, so that the liquid circulation loop is controlled to realize the control of the expansion and contraction of the execution oil cylinder;
The control oil way is provided with a first direction valve which is arranged near the second oil way end, and the reversing of the first direction valve is triggered according to whether the drill rod enters into place or not, one state of the first direction valve is a one-way circulation state, and the first direction valve is in a normal communication state after reversing;
When the elevator is started, high-pressure oil enters from the first oil way end; when the elevator is closed, high-pressure oil enters from the second oil path end;
the control oil path is also provided with a second direction valve which is arranged close to the first oil path end and changes the direction by using an elevator to bear load so as to realize the opening/closing of the second direction valve;
A first one-way valve is arranged between pipelines outside two end parts of the second direction valve, so that oil return is facilitated when high-pressure oil enters through a second oil way end;
The end part of the first direction valve, which is far away from the second oil path end, is provided with a first hydraulic control one-way valve, and the hydraulic pressure of the first hydraulic control one-way valve is taken from the pipeline of the first oil path end flowing into the actuating mechanism so as to realize the circulation of an oil path during oil return;
A third oil cylinder for controlling the first direction valve is further arranged on one side of the first direction valve, and the opening and closing of the first direction valve can be controlled through the extension and contraction of the third oil cylinder;
The hydraulic direction valve is further arranged on an oil way of the opening signal switch and the closing signal switch, the opening signal switch and the closing signal switch are controlled to be respectively communicated with the oil return end T correspondingly, and the opening/closing of the indication signal is realized by changing the internal oil pressure;
The oil way before the high-pressure oil enters the first oil cylinder is further provided with a first sequence valve and a third hydraulic control one-way valve, and the third hydraulic control one-way valve oil way is controlled through the first sequence valve;
A third direction valve is communicated in front of the oil inlet end when the actuating mechanism is used for opening the elevator, the third direction valve is controlled to be opened/closed through the first oil cylinder, and the third direction valve is communicated with an opening signal switch;
a fourth oil cylinder is further communicated between the first sequence valve and the second direction valve, a fourth direction valve is further communicated on an oil way close to the second oil way end, the fourth direction valve is controlled to be opened/closed through the fourth oil cylinder, and the fourth direction valve is communicated with a closing signal switch;
When the actuating mechanism is used for opening the elevator, the oil outlet end of the actuating mechanism is communicated with the other end of the fourth oil cylinder, so that the fourth oil cylinder can be reversely controlled when the second oil way end is used for oil inlet;
When the actuating mechanism is used for opening the elevator, the oil outlet end of the actuating mechanism is communicated with the other end of the fourth oil cylinder, and a second sequence valve is further arranged in an oil way between the actuating mechanism and the fourth oil cylinder so as to control the closing signal switch after the actuating mechanism is closed.
2. A hydraulic elevator control system as set forth in claim 1, wherein: the device comprises an actuating mechanism, a first one-way throttle valve, a balance valve and a third sequence valve, wherein the first one-way throttle valve, the balance valve and the third sequence valve are sequentially connected in series, and the third sequence valve is communicated to the front of an oil inlet end of the actuating mechanism when the actuating mechanism is used for opening the elevator so as to facilitate oil return when the elevator is controlled to be closed.
3. A hydraulic elevator control system as set forth in claim 2, wherein: a fourth sequence valve and a shuttle valve are also communicated in series among the oil way near the second oil way end, the fourth direction valve and the oil way between the closing signal switch, and the shuttle valve is also communicated with the balance valve;
A throttle valve and a second one-way valve are also connected in series between the oil circuit between the fourth sequence valve and the shuttle valve and the oil circuit between the first sequence valve and the second direction valve;
the first sequence valve and the third sequence valve are communicated with an oil way close to the second oil way end so as to facilitate oil return.
4. A hydraulic elevator control system as set forth in claim 3, wherein: the first oil path end is also communicated with a first pressure reducing overflow valve, a second reversing electromagnetic valve and a first overflow valve, and the first overflow valve is communicated with an oil return end T;
the second oil path end is also communicated with a second pressure-reducing overflow valve, a third reversing electromagnetic valve and a second overflow valve, and the second overflow valve is communicated with an oil return end T;
The first pressure reducing overflow valve and the second pressure reducing overflow valve are respectively provided with a bypass, and a third one-way valve and a fourth one-way valve are respectively arranged on the bypass so as to smoothly pass through when oil returns.
5. A hydraulic elevator control system as set forth in claim 1, wherein: the first oil cylinder is further provided with a second one-way throttle valve at the oil inlet end oil way of the execution opening elevator.
6. A hydraulic elevator control method using a hydraulic elevator control system of claim 4, characterized by: comprises the following steps
Opening an elevator;
The electromagnet YV02 is powered on, a first reversing valve is correspondingly controlled, the elevator starts a door opening command, the first reversing electromagnetic valve reverses, when the elevator does not bear the weight of a drill rod, the second direction valve is in a switch-on state as a protection valve, and the elevator executes the door opening command; the high-pressure oil path passes through an oil inlet end P port, and is divided into two branches to flow after passing through a first pressure reducing overflow valve, and a branch-hydraulic direction valve is switched to enable a closing signal switch to be communicated with an oil return end T, so that pressure relief is finished, and the closing signal switch controls a door closing signal lamp to be extinguished; the high-pressure oil of the branch circuit II flows to the fourth oil cylinder through the second direction valve, the fourth oil cylinder works to open the latch, and the latch is opened to cause the fourth direction valve to change direction, so that a door closing signal oil way is completely disconnected; after the latch is opened, the fourth oil cylinder is in a pressure holding state, the pressure of the high-pressure oil way is increased to reach the opening pressure of the first sequence valve, the first sequence valve is opened to enable the third hydraulic control one-way valve to be opened, and the high-pressure oil flows to five branches after passing through the third hydraulic control one-way valve: the first branch and the second branch respectively enter the first oil cylinder and the second oil cylinder, so that the oil cylinders move to perform door opening actions; the third branch flows to the third sequence valve, and as the door opening pressure is limited by the first pressure reducing overflow valve and the first overflow valve in the door opening action of the elevator, the first overflow valve is used as a second-stage pressure regulating valve to limit the door opening pressure to be lower than the set pressure of the third sequence valve, and the third branch oil way is stopped by the third sequence valve and does not advance; the fourth branch enters a third oil cylinder, and a second hydraulic control one-way valve is opened to enable the third oil cylinder to move, and the third oil cylinder has the function of resetting the drill rod triggering mechanism; the fifth branch enters a pilot cavity of the first hydraulic control one-way valve, so that the first hydraulic control one-way valve is opened, and the first oil cylinder, the second oil cylinder, the third oil cylinder and the fourth oil cylinder pass through the first direction valve, the fourth one-way valve and the first reversing electromagnetic valve to finish oil return; triggering a third directional valve to change direction after the lifting door is completely opened, enabling high-pressure oil to enter an opening signal switch through the third directional valve, closing a contact of the opening signal switch after the specified pressure is reached, and lighting a door opening signal lamp;
Closing the elevator;
Giving the electromagnet YV03 power supply, correspondingly controlling a first reversing valve, starting a door closing instruction by the elevator, reversing by the first reversing electromagnetic valve, and dividing a high-pressure oil path into two branch flows after passing through a second pressure reducing overflow valve through an oil inlet end P port: the first branch circuit pushes the hydraulic direction valve to change direction, so that the opening signal switch is communicated with the oil return end T, pressure relief is completed, and the opening signal switch is extinguished; the second branch high-pressure oil flows to a fourth sequence valve, a fourth direction valve and a first direction valve, when a drill rod is put into the elevator, the first direction valve is reversed by the drill rod triggering mechanism; the high-pressure oil is divided into four branches after passing through the first direction valve and the first hydraulic control one-way valve: the first branch passes through the second hydraulic control one-way valve and then enters the third oil cylinder, and the third oil cylinder moves to enable the drill rod triggering mechanism to be in a contracted state, so that the triggering mechanism is prevented from being always propped against the drill rod and wearing the drill rod; the second branch and the third branch respectively enter the first oil cylinder and the second oil cylinder to enable the elevator to perform door closing action; the branch four flows to the fourth oil cylinder, the first oil cylinder and the second oil cylinder are in a pressure-holding state after the closing action of the door is completed, and after the pressure reaches the set value of the second sequence valve, the second sequence valve is opened and flows to the fourth oil cylinder to complete the closing action of the door latch; after the latch is completely closed, the fourth direction valve is triggered, high-pressure oil flows to the closing signal switch after reversing, after the pressure reaches a set value, the contact of the closing signal switch is closed, and a door closing signal lamp is lighted; at the moment, the door closing pressure is limited by the second pressure reducing overflow valve and the second overflow valve, the second overflow valve is used as a second-stage pressure regulating valve to limit the door closing pressure to be lower than the set pressure of the fourth sequence valve, high-pressure oil does not advance after being cut off by the fourth sequence valve, but high-pressure oil in the closing signal switch can enter the pilot cavity of the balance valve through the shuttle valve, the balance valve is opened, hydraulic oil in the fifth oil cylinder flows to the third hydraulic control one-way valve and the first one-way valve through the first one-way throttle valve, the balance valve and the third sequence valve to finish oil return, and the floating function is realized.
7. The hydraulic elevator control method of claim 6, wherein: if the elevator does not have a drill rod or the drill rod is not placed in place, namely the reversing of the first direction valve is not completed, at the moment, a door closing command is given to the elevator, and the elevator cannot be closed.
8. The hydraulic elevator control method of claim 6, wherein: the elevator is turned over;
When the elevator door is in an open state and needs to be turned up, a door opening signal is firstly given to enable the electromagnet YV02 to be powered on, the first reversing valve is correspondingly controlled, then the electromagnet YV01 is correspondingly controlled to be powered on, the second reversing electromagnetic valve is correspondingly controlled to be reversed under the action of the electromagnet YV01, an oil way of the first relief valve is cut off, the door opening pressure is determined by the first relief valve, the set pressure of the first relief valve is larger than the pressure of the third sequence valve, after high-pressure oil passes through the third hydraulic control one-way valve, the oil way passes through the third sequence valve, the balance valve and the first one-way throttle valve to the fifth oil cylinder, the jaw of the main body of the elevator starts to be turned up, the electromagnet YV01 is powered off when the jaw of the main body of the elevator is in a proper position, and the main body of the elevator is opened and kept in the existing position
Or further comprises forced floating of the elevator;
If the lifting clamp is required to be turned down for adjustment, a door closing signal is firstly given to enable the electromagnet YV03 to be powered on, the first reversing valve is correspondingly controlled, then the electromagnet YV04 is simultaneously powered on, and the third reversing electromagnetic valve is correspondingly controlled, at the moment, the oil way of the second overflow valve is cut off, the door closing pressure is set by the third reversing electromagnetic valve, the pressure setting value of the third reversing electromagnetic valve is higher than that of the fourth sequence valve, when high-pressure oil flows to the first direction valve, as a drill rod in the lifting clamp cannot work, the high-pressure oil can only flow to the fourth sequence valve and the fourth direction valve, as the door closing action is not completed, the fourth direction valve is also in a cut-off state, after the fourth sequence valve is opened, the high-pressure oil enters a pilot cavity of the balance valve through the shuttle valve, the balance valve is opened, hydraulic oil in the fifth oil cylinder flows to the third hydraulic control one-way valve and the first one-way valve through the first one-way throttle valve, the balance valve is completed, the floating function is realized, the lifting clamp begins to float and fall, when the lifting clamp is finely adjusted to a proper position, the electromagnet YV04 loses electricity, and the lifting clamp main body is kept at the existing position;
Or further comprises a load protection;
When the elevator main body bears the weight of a drill rod, the second direction valve is triggered to be disconnected, the elevator door is in a closed state, even if the electromagnet YV02 is electrified at the moment, a door opening command is given to correspondingly control the first direction valve, the elevator is still in a locking state, and the safety problem caused by misoperation is avoided.
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