CN113007159B - Hydraulic tensioning method, hydraulic tensioning device and continuous miner - Google Patents
Hydraulic tensioning method, hydraulic tensioning device and continuous miner Download PDFInfo
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- CN113007159B CN113007159B CN202110181430.8A CN202110181430A CN113007159B CN 113007159 B CN113007159 B CN 113007159B CN 202110181430 A CN202110181430 A CN 202110181430A CN 113007159 B CN113007159 B CN 113007159B
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D55/00—Endless track vehicles
- B62D55/08—Endless track units; Parts thereof
- B62D55/30—Track-tensioning means
- B62D55/305—Track-tensioning means acting on pivotably mounted idlers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
- E21C29/22—Propulsion of machines for slitting or completely freeing the mineral from the seam by wheels, endless tracks or the like
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
Abstract
The invention discloses a hydraulic tensioning method, a hydraulic tensioning device and a continuous miner, wherein the hydraulic tensioning method connects a working oil port of an unloading valve with one end of a main tensioning oil way and controls the initial pressure of a main tensioning oil way to reach a first preset value; controlling the final pressure of the main tensioning oil way to reach a second preset value by using a constant-value pressure reducing valve; the first sub-tensioning oil circuit is used for supplying oil to the first tensioning oil cylinder to control the first tensioning oil cylinder to be tensioned, and the second sub-tensioning oil circuit is used for supplying oil to the second tensioning oil cylinder to control the second tensioning oil cylinder to be tensioned; the first check valve is used for controlling the tensioning pressure of the first tensioning oil cylinder to be larger than the final pressure of the main tensioning oil way, and the second check valve is used for controlling the tensioning pressure of the second tensioning oil cylinder to be larger than the final pressure of the main tensioning oil way.
Description
Technical Field
The invention relates to the technical field of tensioning of tracks of coal mining machines, in particular to a hydraulic tensioning method, a hydraulic tensioning device and a continuous coal mining machine.
Background
In the continuous miner in the related art, grease is injected into an oil filling nozzle arranged on an oil cylinder of a guide tensioning device by using a grease gun to tension a track chain, after the tensioning is finished, a proper amount of backing plates and a locking plate are arranged, a screw plug of the oil filling nozzle is unscrewed, the pressure in the oil cylinder is released, and then the screw plug is screwed, so that a piston of a tensioning oil cylinder cannot bear the tensioning force in the normal working process of the machine. The tensioning mode needs manual check to judge whether the crawler chain needs to be tensioned and whether the tensioning degree is proper, when a large amount of manpower is consumed, the crawler chain is easy to loosen or excessively tension due to untimely maintenance or improper maintenance, and a sun gear shaft and a crawler pin of the walking speed reducer are broken or a crawler pin hole is excessively abraded and deformed.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, an embodiment of the present invention provides a hydraulic tensioning method, which can achieve automatic tensioning of a first tensioning cylinder and a second tensioning cylinder through a hydraulic oil path.
The embodiment of the invention provides a hydraulic tensioning device which can realize automatic tensioning of a first tensioning oil cylinder and a second tensioning oil cylinder within a certain pressure range.
Embodiments of the present invention provide a continuous miner capable of achieving automatic tensioning of a track chain.
The hydraulic tensioning method comprises the following steps:
connecting a working oil port of an unloading valve with one end of a main tensioning oil way, and controlling the initial pressure of the main tensioning oil way to reach a first preset value;
connecting a constant-value pressure reducing valve with the main tightening oil way, and controlling the final pressure of the main tightening oil way to reach a second preset value;
connecting the other end of the main tightening oil way with the first sub-tensioning oil way and the second sub-tensioning oil way respectively, and communicating the main tightening oil way with the first sub-tensioning oil way and the second sub-tensioning oil way;
the first sub-tensioning oil circuit is used for supplying oil to a first tensioning oil cylinder to control the first tensioning oil cylinder to be tensioned, and the second sub-tensioning oil circuit is used for supplying oil to a second tensioning oil cylinder to control the second tensioning oil cylinder to be tensioned; and
and a first check valve is arranged on the first sub-tensioning oil path, the tensioning pressure of the first tensioning oil cylinder is controlled to be larger than the final pressure of the main tensioning oil path, a second check valve is arranged on the second sub-tensioning oil path, and the tensioning pressure of the second tensioning oil cylinder is controlled to be larger than the final pressure of the main tensioning oil path.
According to the hydraulic tensioning method provided by the embodiment of the invention, the initial pressure of the main oil-tight passage is adjusted to the first preset value through the unloading valve, and the final pressure of the main oil-tight passage is adjusted to the second preset value through the constant-value pressure reducing valve, so that the pressure of the main oil-tight passage is gradually changed, the instantaneous and large-amplitude change of the pressure of the main oil-tight passage is avoided, and the stability of the main oil-tight passage is facilitated.
The main tensioning oil path supplies oil to the first tensioning oil cylinder through the first sub-tensioning oil path, and supplies oil to the second tensioning oil cylinder through the second sub-tensioning oil path, so that the tensioning pressure of the bases of the first tensioning oil cylinder and the second tensioning oil cylinder is ensured.
In addition, the first check valve can prevent hydraulic oil of the first sub-tensioning oil way from flowing back to the main tensioning oil way, the second check valve can prevent hydraulic oil of the second sub-tensioning oil way from flowing back to the main tensioning oil way, pressure increase of the main tensioning oil way can be avoided, stability of the main tensioning oil way can be guaranteed, and the first tensioning oil cylinder and the second tensioning oil cylinder can have large tensioning pressure.
Therefore, the hydraulic tensioning method has the advantages of automatic tensioning and good stability.
In some embodiments, the hydraulic tensioning method further comprises:
connecting a first overflow valve with a part of the first sub-tensioning oil path between the first tensioning oil cylinder and the first one-way valve, controlling the tensioning pressure of the first tensioning oil cylinder to be smaller than the maximum value, connecting a second overflow valve with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and controlling the tensioning pressure of the second tensioning oil cylinder to be smaller than the maximum value; and
and connecting a first pressure sensor with a part of the first sub-tensioning oil path between the first tensioning oil cylinder and the first one-way valve, monitoring the tensioning pressure of the first tensioning oil cylinder, connecting a second pressure sensor with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and monitoring the tensioning pressure of the second tensioning oil cylinder.
In some embodiments, the hydraulic tensioning method further comprises:
connecting a first stop valve with a part of the first sub-tensioning oil path, which is positioned between the first tensioning oil cylinder and the first one-way valve, opening the first stop valve to unload the first tensioning oil cylinder when a fault occurs,
and connecting a second stop valve with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and opening the second stop valve to unload the second tensioning oil cylinder when a fault occurs.
In some embodiments, the hydraulic tensioning method further comprises:
connecting a control valve with a part of the main oil tightening circuit, which is positioned between one end of the main oil tightening circuit and the fixed value pressure reducing valve, and controlling the initial pressure of the main oil tightening circuit to reach the first preset value; and
and connecting a third pressure sensor to a part of the main tightening oil circuit between the other end of the main tightening oil circuit and the constant value pressure reducing valve, and monitoring the final pressure of the main tightening oil circuit.
According to an embodiment of the invention, a hydraulic tensioning device comprises:
a source of oil;
a first tank and a second tank;
maintaining a tight oil path;
an oil inlet of the unloading valve is connected with the oil source, a working oil port of the unloading valve is connected with one end of the main tightening oil way, and an oil drainage port of the unloading valve is communicated with the first oil tank so as to enable the initial pressure of the main tightening oil way to reach a first preset value;
the first tensioning oil cylinder and the second tensioning oil cylinder;
one end of the first sub-tensioning oil way is connected with the other end of the main tensioning oil way, the other end of the first sub-tensioning oil way is connected with the rodless cavity of the first tensioning oil cylinder so as to control the tensioning of the first tensioning oil cylinder, one end of the second sub-tensioning oil way is connected with the other end of the tensioning oil way, and the other end of the second sub-tensioning oil way is connected with the rodless cavity of the second tensioning oil cylinder so as to control the tensioning of the second tensioning oil cylinder;
the constant value pressure reducing valve is arranged on the main tightening oil way, and an oil drainage port of the constant value pressure reducing valve is communicated with the second oil tank so as to control the final pressure of the main tightening oil way to reach a second preset value; and
the first check valve is arranged on the first sub-tensioning oil path so as to control the tensioning pressure of the first tensioning oil cylinder to be larger than the final pressure of the main tensioning oil path, and the second check valve is arranged on the second sub-tensioning oil path so as to control the tensioning pressure of the second tensioning oil cylinder to be larger than the final pressure of the main tensioning oil path.
According to the hydraulic tensioning device provided by the embodiment of the invention, the unloading valve adjusts the initial pressure of the main tightening oil circuit to the first preset value, and the constant-value pressure reducing valve adjusts the final pressure of the main tightening oil circuit to the second preset value, so that the instantaneous and large-amplitude change of the pressure of the main tightening oil circuit is avoided, and the stability of the main tensioning oil circuit is facilitated.
The main tensioning oil path supplies oil to the first tensioning oil cylinder through the first sub-tensioning oil path, and supplies oil to the second tensioning oil cylinder through the second sub-tensioning oil path, so that the tensioning pressure of the bases of the first tensioning oil cylinder and the second tensioning oil cylinder is ensured.
In addition, the first check valve can prevent hydraulic oil of the first sub-tensioning oil way from flowing back to the main tensioning oil way, the second check valve can prevent hydraulic oil of the second sub-tensioning oil way from flowing back to the main tensioning oil way, pressure increase of the main tensioning oil way can be avoided, stability of the main tensioning oil way can be guaranteed, and the first tensioning oil cylinder and the second tensioning oil cylinder can have large tensioning pressure.
Therefore, the hydraulic tensioning method provided by the embodiment of the invention has the advantages of automatic tensioning and good stability.
In some embodiments, the hydraulic tensioning device further comprises:
the oil inlet of the throttling valve is connected with a part of the main oil tight path, which is positioned between one end of the main oil tight path and the constant-value pressure reducing valve; and
each of an oil inlet of the control valve and a control oil port of the control valve is communicated with an oil outlet of the throttling valve, a working oil port of the control valve is communicated with a first control oil port of the unloading valve, the oil source is connected with a second control oil port of the unloading valve, and an oil drainage port of the control valve is communicated with the second oil tank.
In some embodiments, the hydraulic tensioning device further comprises:
an oil inlet of the first overflow valve is connected with a part, positioned between the first check valve and the first tensioning oil cylinder, of the first sub-tensioning oil way, and an oil outlet of the first overflow valve is communicated with the first oil tank; and
and an oil inlet of the second overflow valve is connected with a part of the second sub-tensioning oil path between the second one-way valve and the second tensioning oil cylinder, and an oil outlet of the second overflow valve is communicated with the first oil tank.
In some embodiments, the hydraulic tensioning device further comprises:
the oil inlet of the first stop valve is connected with the part, positioned between the first one-way valve and the first tensioning oil cylinder, of the first sub-tensioning oil way, and the oil outlet of the first stop valve is communicated with the first oil tank;
an oil inlet of the second stop valve is connected with a part, located between the second one-way valve and the second tensioning oil cylinder, of the second sub-tensioning oil path, and an oil outlet of the second stop valve is communicated with the first oil tank;
the first pressure sensor is connected with a part, positioned between the first check valve and the first tensioning oil cylinder, of the first sub-tensioning oil way so as to monitor the tensioning pressure of the first tensioning oil cylinder;
a second pressure sensor connected to a portion of the second sub-tensioning oil path between the second check valve and the second tensioning cylinder so as to monitor a tensioning pressure of the second tensioning cylinder; and
a third pressure sensor connected to a portion of the main emergency oil passage between the other end of the main emergency oil passage and the fixed-value pressure reducing valve, so as to monitor a final pressure of the main emergency oil passage.
The continuous miner according to the embodiment of the invention comprises:
the crawler frame is provided with a guide frame and a plurality of travelling wheels, and the guide frame is provided with a guide groove;
the crawler chain is arranged on the crawler frame and matched with the plurality of walking wheels, and part of the walking wheels are driven by a motor;
the hydraulic tensioning device is the hydraulic tensioning device of any one of the embodiments;
the tensioning oil cylinder is a first tensioning oil cylinder or a second tensioning oil cylinder of the hydraulic tensioning device, at least part of the tensioning oil cylinder is located in the guide groove, the tensioning oil cylinder is provided with a cylinder body and a piston rod, the cylinder body can move relative to the piston rod in the length direction of the piston rod, the length direction of the piston rod is parallel to the front-back direction, and one end of the rear part of the piston rod is in contact with the bottom wall of the guide groove; and
the tensioning wheel is rotatably arranged on the cylinder body, the tensioning wheel is matched with the track chain, and the tensioning wheel is located between the track chain and the guide frame in the front-back direction.
According to the continuous miner provided by the embodiment of the invention, the tensioning wheel and the hydraulic tensioning device of any one of the embodiments can be used for automatically tensioning the track chain, and the advantages of automatic tensioning and good stability are achieved.
In some embodiments, the continuous miner further includes:
the fixed plate is arranged on the guide frame and is positioned above the guide groove;
a proximity sensor mounted on the fixed plate; and
the moving plate is arranged on the cylinder body and can move in the front-rear direction relative to the fixed plate, a baffle is arranged at one end of the rear side of the moving plate, and the baffle corresponds to the proximity sensor in the front-rear direction.
Drawings
FIG. 1 is a schematic diagram of a hydraulic tensioner of an embodiment of the present invention.
FIG. 2 is a schematic view of an unloader valve.
Fig. 3 is a schematic diagram of a control valve.
Fig. 4 is a partial structural schematic view of a continuous miner according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of the tensioning cylinder and the tensioning wheel.
Fig. 6 is a tensioning control flow diagram of the continuous miner according to an embodiment of the invention.
Reference numerals:
a track frame 10; a guide frame 11; a guide groove 12; a bottom wall 121;
a track chain 20;
a tensioner 30;
a tensioning cylinder 40; a cylinder 41; a piston rod 42;
a fixed plate 51; a moving plate 52; a proximity sensor 53;
an unloading valve 100;
a control valve 200;
a constant-value pressure reducing valve 300;
a main tension oil passage 410; the first sub-tension oil passage 420; the second sub-tension oil passage 430;
a first tensioning cylinder 510; a second tensioning cylinder 520;
a first pressure sensor 610; a second pressure sensor 620; 630. a third pressure sensor;
a first shut-off valve 710; a second shut-off valve 720;
a first relief valve 810; a second relief valve 820;
a first one-way valve 910; a second one-way valve 920;
an oil source P; a first tank T1; and a second tank T2.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A hydraulic tensioning method of an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1 to 3, a hydraulic tensioning method according to an embodiment of the present invention includes the steps of:
connecting a working oil port of the unloading valve 100 with one end of the main tightening oil path 410, and controlling the initial pressure of the main tightening oil path 410 to reach a first preset value, specifically, the first preset value is greater than or equal to 13MP and less than or equal to 18MP;
connecting the constant-value pressure reducing valve 300 with the main tensioning oil path 410, and controlling the final pressure of the main tensioning oil path 410 to reach a second preset value, specifically, the second preset value is greater than or equal to 9MP and less than or equal to 11MP;
connecting the other end of the main tensioning oil passage 410 to the first sub tensioning oil passage 420 and the second sub tensioning oil passage 430, respectively, and communicating the main tensioning oil passage 410 with the first sub tensioning oil passage 420 and the second sub tensioning oil passage 430;
the first sub-tensioning oil path 420 is used for supplying oil to the first tensioning oil cylinder 510 to control the tensioning of the first tensioning oil cylinder 510, and the second sub-tensioning oil path 430 is used for supplying oil to the second tensioning oil cylinder 520 to control the tensioning of the second tensioning oil cylinder 520; and
the first check valve 910 is provided to the first sub-tensioning oil passage 420 to control the tensioning pressure of the first tensioning cylinder 510 to be greater than the final pressure of the main tensioning oil passage 410, and the second check valve 920 is provided to the second sub-tensioning oil passage 430 to control the tensioning pressure of the second tensioning cylinder 520 to be greater than the final pressure of the main tensioning oil passage 410.
According to the hydraulic tensioning method provided by the embodiment of the invention, the initial pressure of the main tensioning oil path 410 is adjusted to the first preset value through the unloading valve 100, and the final pressure of the main tensioning oil path 410 is adjusted to the second preset value through the constant-value reducing valve 300, so that the pressure of the main tensioning oil path 410 is changed step by step, the instantaneous and large-amplitude change of the pressure of the main tensioning oil path 410 is avoided, and the stability of the main tensioning oil path 410 is facilitated.
It can be understood that, when the unloading valve 100 is unloading, the unloading valve 100 is reversed to directly communicate the oil source P with the first oil tank T1, and the amount of hydraulic oil delivered to the main tightening oil path 410 is reduced, so that the initial pressure of the main tightening oil path 410 is adjusted to the first preset value. In the unloading process, the hydraulic oil directly enters the first oil tank T1, the resistance is small, the heat productivity is low, and the heat productivity of the unloading valve 100 can be further reduced.
The main tensioning oil passage 410 supplies oil to the first tensioning cylinder 510 through the first sub tensioning oil passage 420, and supplies oil to the second tensioning cylinder 520 through the second sub tensioning oil passage 430, thereby ensuring the tensioning pressure of the basis of the first tensioning cylinder 510 and the second tensioning cylinder 520.
In addition, the first check valve 910 can prevent the hydraulic oil of the first sub-tensioning oil passage 420 from flowing back to the main tensioning oil passage 410, and the second check valve 920 can prevent the hydraulic oil of the second sub-tensioning oil passage 430 from flowing back to the main tensioning oil passage 410, can prevent the pressure of the main tensioning oil passage 410 from increasing, is beneficial to maintaining the stability of the main tensioning oil passage 410, and can enable the first tensioning cylinder 510 and the second tensioning cylinder 520 to have larger tensioning pressure.
Therefore, the hydraulic tensioning method provided by the embodiment of the invention has the advantages of automatic tensioning and good stability.
In some embodiments, the hydraulic tensioning method of embodiments of the present invention further comprises:
connecting a first overflow valve 810 with a part of the first sub-tensioning oil path 420 between the first tensioning oil cylinder 510 and the first check valve 910, controlling the tensioning pressure of the first tensioning oil cylinder 510 to be smaller than a maximum value, wherein the maximum value is 35MP, connecting a second overflow valve 820 with a part of the second sub-tensioning oil path 430 between the second tensioning oil cylinder 520 and the second check valve 920, and controlling the tensioning pressure of the second tensioning oil cylinder 520 to be smaller than the maximum value; and
the first pressure sensor 510 is connected to a portion of the first sub-tensioning oil passage 420 between the first tensioning cylinder 510 and the first check valve 910 to monitor the tensioning pressure of the first tensioning cylinder 510, and the second pressure sensor 620 is connected to a portion of the second sub-tensioning oil passage 430 between the second tensioning cylinder 520 and the second check valve 920 to monitor the tensioning pressure of the second tensioning cylinder 520.
The first overflow valve 810 controls the tension pressure of the first tension cylinder 510 to be lower than 35MP, and the second overflow valve 820 controls the tension pressure of the second tension cylinder 520 to be lower than 35MP, so that the excessive tension pressure can be avoided, and the first tension cylinder 510, the second tension cylinder 520 and the tension oil path can be protected.
In some embodiments, the hydraulic tensioning method of embodiments of the present invention further comprises:
the first check valve 710 is connected to a portion of the first sub-tensioning oil path 420 between the first tensioning cylinder 510 and the first check valve 910, and, when a failure occurs, the first check valve 710 is opened to unload the first tensioning cylinder 510,
the second cutoff valve 720 is connected to a portion of the second sub-tensioning oil path 430 between the second tensioning cylinder 520 and the second check valve 920, and when a failure occurs, the second cutoff valve 720 is opened to unload the second tensioning cylinder 520.
When the tensioning oil way and the tensioning oil cylinder are in failure, unloading can be performed by opening the first stop valve 710 and the second stop valve 720, and overhauling, disassembly and assembly are facilitated.
In some embodiments, the hydraulic tensioning method of embodiments of the present invention further comprises:
connecting the control valve 200 with a portion of the main tight oil path 410, which is located between one end of the main tight oil path and the fixed value pressure reducing valve 300, and controlling the initial pressure of the main tight oil path 410 to reach a first preset value, that is, controlling the unloading valve 100 by using the control valve 200 so that the initial pressure of the main tight oil path 410 reaches the first preset value; and
the third pressure sensor 630 is connected to a portion of the main relief circuit 410 between the other end of the main relief circuit and the fixed-value relief valve 300, and the final pressure of the main relief circuit 410 is monitored.
As shown in fig. 1, a throttle valve is further provided between the control valve 200 and the main hydraulic circuit 410, the throttle valve can reduce the flow rate of the hydraulic oil, can avoid frequent actions of the control valve 200, and controls the first preset value to be between 13MP and 18 MP.
A hydraulic tensioner of an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, a hydraulic tensioning apparatus according to an embodiment of the present invention includes an oil source P, a first oil tank T1, a second oil tank T2, a main tensioning oil passage 410, an unloading valve 100, a first tensioning cylinder 510, a second tensioning cylinder 520, a first sub tensioning oil passage 420, a second sub tensioning oil passage 430, a constant pressure reducing valve 300, a first check valve 910, and a second check valve 920.
An oil inlet 110 of the unloading valve 100 is connected with an oil source P, a working oil port 120 of the unloading valve 100 is connected with one end of the main tightening oil path 410, and an oil drainage port 130 of the unloading valve 100 is communicated with a first oil tank T1, so that the initial pressure of the main tightening oil path 410 reaches a first preset value.
One end of the first sub-tensioning oil passage 420 is connected to the other end of the main tensioning oil passage 410, the other end of the first sub-tensioning oil passage 420 is connected to the rodless chamber of the first tensioning cylinder 510 to control tensioning of the first tensioning cylinder 510, one end of the second sub-tensioning oil passage 430 is connected to the other end of the tensioning oil passage, and the other end of the second sub-tensioning oil passage 430 is connected to the rodless chamber of the second tensioning cylinder 520 to control tensioning of the second tensioning cylinder 520.
The constant pressure reducing valve 300 is provided on the main tension oil path 410, and the drain port 240 of the constant pressure reducing valve 300 is communicated with the second tank T2 so as to control the final pressure of the main tension oil path 410 to reach a second preset value.
A first check valve 910 is provided on the first sub-tensioning oil passage 420 to control the tensioning pressure of the first tensioning cylinder 510 to be greater than the final pressure of the main tensioning oil passage 410, and a second check valve 920 is provided on the second sub-tensioning oil passage 430 to control the tensioning pressure of the second tensioning cylinder 520 to be greater than the final pressure of the main tensioning oil passage 410.
According to the hydraulic tensioning device provided by the embodiment of the invention, the unloading valve 100 adjusts the initial pressure of the main oil-tight passage 410 to the first preset value, and the constant-value pressure reducing valve 300 adjusts the final pressure of the main oil-tight passage 410 to the second preset value, so that the pressure of the main oil-tight passage 410 is changed step by step, the instantaneous and large-amplitude change of the pressure of the main oil-tight passage 410 is avoided, and the stability of the main oil-tight passage 410 is facilitated.
It can be understood that, when the unloading valve 100 is unloading, the unloading valve 100 is reversed to directly communicate the oil source P with the first oil tank T1, so as to reduce the amount of hydraulic oil delivered to the main tightening oil passage 410, thereby adjusting the initial pressure of the main tightening oil passage 410 to the first preset value. In the unloading process, the hydraulic oil directly enters the first oil tank T1, the resistance is small, the heat productivity is low, and the heat productivity of the unloading valve 100 can be further reduced.
The main tensioning oil passage 410 supplies oil to the first tensioning cylinder 510 through the first sub tensioning oil passage 420, and supplies oil to the second tensioning cylinder 520 through the second sub tensioning oil passage 430, thereby ensuring the tensioning pressure of the basis of the first tensioning cylinder 510 and the second tensioning cylinder 520.
In addition, the first check valve 910 can prevent the hydraulic oil of the first sub-tensioning oil passage 420 from flowing back to the main tensioning oil passage 410, and the second check valve 920 can prevent the hydraulic oil of the second sub-tensioning oil passage 430 from flowing back to the main tensioning oil passage 410, so that the pressure increase of the main tensioning oil passage 410 can be avoided, the stability of the main tensioning oil passage 410 can be maintained, and the first tensioning oil cylinder 510 and the second tensioning oil cylinder 520 can have larger tensioning pressure.
Therefore, the hydraulic tensioning method provided by the embodiment of the invention has the advantages of automatic tensioning and good stability.
As shown in fig. 1-3, in some embodiments, the hydraulic tensioning device of embodiments of the present invention further includes a throttle and control valve 200.
An oil inlet of the throttle valve is connected to a portion of the main pressure-reducing oil path 410 between one end of the main pressure-reducing oil path 410 and the fixed-value pressure-reducing valve 300. Each of the oil inlet 210 of the control valve 200 and the control oil port 230 of the control valve 200 is communicated with an oil outlet of the throttle valve, the working oil port 220 of the control valve 200 is communicated with the first control oil port 140 of the unloading valve 100, the oil source P is connected with the second control oil port 150 of the unloading valve 100, and the oil drain port 240 of the control valve 200 is communicated with the second oil tank T2.
The control valve 200 is displaced according to the pressure of the main tightening oil path 410, and further, the unloading valve 100 is controlled to be displaced, so that the initial pressure of the tightening oil path 410 can be maintained at the first preset value.
As shown in fig. 1 to 3, the linkage process of the control valve 200 and the unloading valve 100 is as follows:
at the moment when the oil source P starts to work, the second control oil port 150 receives a pressure signal of the oil source P, the unloading valve 100 is in the right position, hydraulic oil provided by the oil source P enters the unloading valve 100 from the oil inlet 110 and is directly discharged from the working oil port 120, and the initial pressure of the tight oil path 410 is considered to be greater than a first preset value;
the control oil port 230 of the control valve 200 receives an initial pressure signal for maintaining the tight oil path 410, the control valve 200 is in the right position, hydraulic oil for maintaining the tight oil path 410 enters the control valve 200 from the oil inlet 210 of the control valve 200 and flows out from the working oil port 220 of the control valve 200, the first control oil port 140 of the unloading valve 100 receives a hydraulic oil pressure signal for the working oil port 220 of the control valve 200, and the unloading valve 100 is switched to the left position;
when the unloading valve 100 is in the left position, after hydraulic oil provided by the oil source P enters the unloading valve 100 from the oil inlet 110, a part of the hydraulic oil is discharged to the first oil tank T1 from the oil discharge port 130, and the other part of the hydraulic oil is discharged from the working oil port 120, so that the initial pressure of the main tensioning oil path 410 is kept at a first preset value;
after a certain time, maintaining that the initial pressure of the oil tightening circuit 410 is smaller than a first preset value;
the control oil port 230 of the control valve 200 receives an initial pressure signal for maintaining the tight oil path 410, the control valve 200 is reversed to the left position, the hydraulic oil entering the control valve 200 is discharged to the second oil tank T2 through the oil discharge port 240, the first control oil port 140 of the unloading valve 100 stops receiving the hydraulic oil pressure signal of the working oil port 220 of the control valve 200, and the unloading valve 100 is changed to the right position under the control of the second control oil port 150;
the above process is repeated such that the initial pressure of main emergency circuit 410 is dynamically at the first preset value.
Further, the throttle valve can reduce the flow of the hydraulic oil entering the control valve 200, further slow down the frequency of displacement of the control valve 200, prolong the service life of the control valve 200 and the unloading valve 100, and control the first preset value between 13MP and 18 MP.
As shown in fig. 1, in some embodiments, the hydraulic tensioning device of embodiments of the present invention further includes a first relief valve 810 and a second relief valve 820.
An oil inlet of the first overflow valve 810 is connected with a part, located between the first check valve 910 and the first tensioning oil cylinder 510, of the first sub-tensioning oil path 420, and an oil outlet of the first overflow valve 810 is communicated with the first oil tank T1. An oil inlet of the second overflow valve 820 is connected with a part, located between the second check valve 920 and the second tensioning oil cylinder 520, of the second sub-tensioning oil path 430, and an oil outlet of the second overflow valve 820 is communicated with the first oil tank T1.
The first overflow valve 810 controls the tension pressure of the first tension cylinder 510 to be lower than 35MP, and the second overflow valve 820 controls the tension pressure of the second tension cylinder 520 to be lower than 35MP, so that the excessive tension pressure can be avoided, and the first tension cylinder 510, the second tension cylinder 520 and the tension oil path can be protected.
As shown in fig. 1, the hydraulic tensioner of an embodiment of the present invention further includes a first shut-off valve 710 and a second shut-off valve 720.
An oil inlet of the first cut-off valve 710 is connected with a portion of the first sub-tensioning oil path 420 between the first check valve 910 and the first tensioning cylinder 510, and an oil outlet of the first cut-off valve 710 is communicated with the first oil tank T1. An oil inlet of the second cut-off valve 720 is connected with a portion, located between the second check valve 920 and the second tensioning oil cylinder 520, of the second sub-tensioning oil path 430, and an oil outlet of the second cut-off valve 720 is communicated with the first oil tank T1. When the tensioning oil way and the tensioning oil cylinder are in failure, unloading can be performed by opening the first stop valve 710 and the second stop valve 720, and overhauling, disassembly and assembly are facilitated.
Further, as shown in fig. 1, the hydraulic tensioner of the present embodiment of the invention further includes a first pressure sensor 510, a second pressure sensor 620, and a third pressure sensor 630.
The first pressure sensor 510 is connected to a portion of the first sub-tensioning oil passage 420 between the first check valve 910 and the first tensioning cylinder 510 to monitor the tensioning pressure of the first tensioning cylinder 510. The second pressure sensor 620 is connected to a portion of the second sub-tensioning oil passage 430 between the second check valve 920 and the second tensioning cylinder 520 so as to monitor the tensioning pressure of the second tensioning cylinder 520. The third pressure sensor 630 is connected to a portion of the main tightening oil passage 410 between the other end of the main tightening oil passage and the constant pressure reducing valve 300 so as to monitor the final pressure of the main tightening oil passage 410. Therefore, the hydraulic tensioning device of the embodiment of the invention can timely repair the hydraulic tensioning device when monitoring the tensioning pressure of the first tensioning cylinder 510, the pressure of the second tensioning cylinder 520 and the final pressure of the main tensioning oil circuit 410 to be abnormal.
A continuous miner according to an embodiment of the present invention is described below with reference to the drawings.
As shown in fig. 1 to 6, the continuous miner according to an embodiment of the present invention includes a track frame 10, a track chain 20, a hydraulic tensioner, a tensioning cylinder 40, and a tensioning wheel 30.
The track frame 10 has a guide frame 11 and a plurality of road wheels, and the guide frame 11 is provided with a guide groove 12. The track chain 20 is disposed on the track frame 10 and is engaged with a plurality of traveling wheels, and a part of the traveling wheels are driven by a motor.
The hydraulic tensioner may be the hydraulic tensioner of any of the embodiments described above, and the tensioning cylinder 40 is the first tensioning cylinder 510 or the second tensioning cylinder 520 of the hydraulic tensioner. At least a part of the tension cylinder 40 is located in the guide groove 12, the tension cylinder has a cylinder body 41 and a piston rod 42, the cylinder body 41 is movable relative to the piston rod 42 in a longitudinal direction of the piston rod 42, the longitudinal direction of the piston rod 42 is parallel to the front-rear direction, and a rear end of the piston rod 42 is in contact with the bottom wall 121 of the guide groove 12.
According to the continuous miner provided by the embodiment of the invention, the crawler chain 20 can be automatically tensioned by using the hydraulic tensioning device, and the continuous miner has the advantages of automatic tensioning and good stability.
As shown in fig. 4, in some embodiments, the continuous miner of embodiments of the invention also includes a fixed plate 51, a proximity sensor 53, and a moving plate 52.
The fixed plate 51 is provided on the guide frame 11 above the guide groove 12, and the proximity sensor 53 is attached to the fixed plate 51. The moving plate 52 is provided on the cylinder 41, the moving plate 52 is movable in the front-rear direction with respect to the fixed plate 51, and one end of the moving plate 52 on the rear side has a shutter corresponding to the proximity sensor 53 in the front-rear direction.
As shown in fig. 3, the proximity sensor 53 can detect that the tensioning cylinder 40 drives the tensioning wheel 30 to the limit position, so that an alarm signal can be provided to the controller, and the walking motor and the hydraulic tensioning device stop working and are overhauled.
The first pressure sensor 510 can detect that the tensioning pressure of the first tensioning cylinder 510 is abnormal, and the second pressure sensor 620 can detect that the tensioning pressure of the second tensioning cylinder 520 is abnormal, so that an alarm signal can be provided to the controller, and the walking motor and the hydraulic tensioning device stop working and are overhauled.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of hydraulic tensioning, comprising the steps of:
connecting a working oil port of an unloading valve with one end of a main tensioning oil way, and controlling the initial pressure of the main tensioning oil way to reach a first preset value;
connecting a constant-value pressure reducing valve with the main tight oil circuit, and controlling the final pressure of the main tight oil circuit to reach a second preset value;
connecting each of an oil inlet and a control oil port of a control valve with a part between one end of a main tensioning oil path and a fixed value pressure reducing valve on a main tensioning oil path, and connecting a working oil port of the control valve with a first control oil port of an unloading valve so that the control valve controls the unloading valve to control the initial pressure of the main tensioning oil path to reach a first preset value;
connecting the other end of the main tightening oil way with a first sub-tensioning oil way and a second sub-tensioning oil way respectively, and communicating the main tightening oil way with the first sub-tensioning oil way and the second sub-tensioning oil way;
the first sub-tensioning oil circuit is used for supplying oil to a first tensioning oil cylinder to control the first tensioning oil cylinder to be tensioned, and the second sub-tensioning oil circuit is used for supplying oil to a second tensioning oil cylinder to control the second tensioning oil cylinder to be tensioned; and
and a first check valve is arranged on the first sub-tensioning oil path, the tensioning pressure of the first tensioning oil cylinder is controlled to be larger than the final pressure of the main tensioning oil path, a second check valve is arranged on the second sub-tensioning oil path, and the tensioning pressure of the second tensioning oil cylinder is controlled to be larger than the final pressure of the main tensioning oil path.
2. The hydraulic tensioning method according to claim 1, further comprising:
connecting a first overflow valve with a part of the first sub-tensioning oil path between the first tensioning oil cylinder and the first one-way valve, controlling the tensioning pressure of the first tensioning oil cylinder to be smaller than the maximum value, connecting a second overflow valve with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and controlling the tensioning pressure of the second tensioning oil cylinder to be smaller than the maximum value; and
and connecting a first pressure sensor with a part of the first sub-tensioning oil path between the first tensioning oil cylinder and the first one-way valve, monitoring the tensioning pressure of the first tensioning oil cylinder, connecting a second pressure sensor with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and monitoring the tensioning pressure of the second tensioning oil cylinder.
3. The hydraulic tensioning method according to claim 2, further comprising:
connecting a first stop valve with a part of the first sub-tensioning oil path, which is positioned between the first tensioning oil cylinder and the first one-way valve, opening the first stop valve to unload the first tensioning oil cylinder when a fault occurs,
and connecting a second stop valve with a part of the second sub-tensioning oil path between the second tensioning oil cylinder and the second one-way valve, and opening the second stop valve to unload the second tensioning oil cylinder when a fault occurs.
4. The hydraulic tensioning method according to claim 1, further comprising:
connecting a control valve with a part of the main oil tightening circuit, which is positioned between one end of the main oil tightening circuit and the fixed value pressure reducing valve, and controlling the initial pressure of the main oil tightening circuit to reach the first preset value; and
and connecting a third pressure sensor to a part of the main emergency oil passage between the other end of the main emergency oil passage and the constant pressure reducing valve, and monitoring the final pressure of the main tensioning oil passage.
5. A hydraulic tensioner, comprising:
a source of oil;
a first tank and a second tank;
maintaining a tight oil path;
an oil inlet of the unloading valve is connected with the oil source, a working oil port of the unloading valve is connected with one end of the main tightening oil way, and an oil drainage port of the unloading valve is communicated with the first oil tank so as to enable the initial pressure of the main tightening oil way to reach a first preset value;
the first tensioning oil cylinder and the second tensioning oil cylinder;
one end of the first sub-tensioning oil way is connected with the other end of the main tensioning oil way, the other end of the first sub-tensioning oil way is connected with the rodless cavity of the first tensioning oil cylinder so as to control the tensioning of the first tensioning oil cylinder, one end of the second sub-tensioning oil way is connected with the other end of the main tensioning oil way, and the other end of the second sub-tensioning oil way is connected with the rodless cavity of the second tensioning oil cylinder so as to control the tensioning of the second tensioning oil cylinder;
the constant value pressure reducing valve is arranged on the main tightening oil way, and an oil drainage port of the constant value pressure reducing valve is communicated with the second oil tank so as to control the final pressure of the main tightening oil way to reach a second preset value; and
a first check valve and a second check valve, wherein the first check valve is arranged on the first sub-tensioning oil path so as to control the tensioning pressure of the first tensioning oil cylinder to be greater than the final pressure of the main tensioning oil path, and the second check valve is arranged on the second sub-tensioning oil path so as to control the tensioning pressure of the second tensioning oil cylinder to be greater than the final pressure of the main tensioning oil path;
each of an oil inlet of the control valve and a control oil port of the control valve is connected with a part, located between one end of the main tightening oil path and the fixed value pressure reducing valve, of the main tightening oil path, and a working oil port of the control valve is connected with a first control oil port of the unloading valve, so that the control valve controls the initial pressure of the unloading valve to control the main tensioning oil path to reach a preset value; the oil source is connected with the first control oil port of the unloading valve, and the oil unloading port of the control valve is connected with the second oil tank.
6. The hydraulic tensioner as in claim 5, further comprising:
the oil inlet of the throttling valve is connected with a part of the main oil tight path, which is positioned between one end of the main oil tight path and the constant-value pressure reducing valve; and
each of the oil inlet of the control valve and the control oil port of the control valve is communicated with the oil outlet of the throttle valve.
7. The hydraulic tensioning device of claim 6, further comprising:
an oil inlet of the first overflow valve is connected with a part, located between the first check valve and the first tensioning oil cylinder, of the first sub-tensioning oil way, and an oil outlet of the first overflow valve is communicated with the first oil tank; and
and an oil inlet of the second overflow valve is connected with a part of the second sub-tensioning oil path between the second one-way valve and the second tensioning oil cylinder, and an oil outlet of the second overflow valve is communicated with the first oil tank.
8. The hydraulic tensioning device of claim 6, further comprising:
the oil inlet of the first stop valve is connected with the part, positioned between the first one-way valve and the first tensioning oil cylinder, of the first sub-tensioning oil way, and the oil outlet of the first stop valve is communicated with the first oil tank;
an oil inlet of the second stop valve is connected with a part, located between the second one-way valve and the second tensioning oil cylinder, of the second sub-tensioning oil path, and an oil outlet of the second stop valve is communicated with the first oil tank;
the first pressure sensor is connected with a part, located between the first one-way valve and the first tensioning oil cylinder, of the first sub-tensioning oil way, so that the tensioning pressure of the first tensioning oil cylinder can be monitored;
a second pressure sensor connected to a portion of the second sub-tensioning oil path between the second check valve and the second tensioning cylinder so as to monitor a tensioning pressure of the second tensioning cylinder; and
a third pressure sensor connected to a portion of the main emergency oil passage between the other end of the main emergency oil passage and the fixed-value pressure reducing valve, so as to monitor a final pressure of the main emergency oil passage.
9. A continuous miner, comprising:
the crawler frame is provided with a guide frame and a plurality of travelling wheels, and the guide frame is provided with a guide groove;
the crawler chain is arranged on the crawler frame and matched with the plurality of walking wheels, and part of the walking wheels are driven by a motor;
a hydraulic tensioning device, said hydraulic tensioning device being a hydraulic tensioning device as claimed in any one of claims 5 to 8;
the tensioning oil cylinder is a first tensioning oil cylinder or a second tensioning oil cylinder of the hydraulic tensioning device, at least part of the tensioning oil cylinder is located in the guide groove, the tensioning oil cylinder is provided with a cylinder body and a piston rod, the cylinder body can move relative to the piston rod in the length direction of the piston rod, the length direction of the piston rod is parallel to the front-back direction, and one end of the rear part of the piston rod is in contact with the bottom wall of the guide groove; and
the tensioning wheel is rotatably arranged on the cylinder body, is matched with the track chain and is positioned between the track chain and the guide frame in the front-rear direction.
10. The continuous miner of claim 9, further comprising:
the fixed plate is arranged on the guide frame and is positioned above the guide groove;
a proximity sensor mounted on the fixed plate; and
the moving plate is arranged on the cylinder body and can move in the front-rear direction relative to the fixed plate, a baffle is arranged at one end of the rear side of the moving plate, and the baffle corresponds to the proximity sensor in the front-rear direction.
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