Protecting device for hydraulic system of coal mining machine
阅读说明：本技术 采煤机液压系统保护装置 (Protecting device for hydraulic system of coal mining machine ) 是由 李鹏 王东林 杨勇 郑茂慧 孙炳清 杨朋威 王辉 苏岳 张正萌 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种采煤机液压系统保护装置,包括：外罩,用以将液压系统罩住以进行防止煤矸掉落到液压系统内部对液压系统产生损坏；刮板,用以将掉落在外罩上表面的煤矸刮除；固定管,用以保持外罩内液压系统的温度；散热片,用以吸收所述液压系统产生的热量；吸风管,用以运输所述散热片吸收的液压系统的热量；冷却扇,用以将所述吸风管运输过来的热量进行冷却；夹块,用以将液压系统的油管进行固定。从而能够有效防止顶板冒落煤矸,砸坏或掩埋机组上的液压配件及管路,降低了安全隐患,延长了液压系统的使用寿命。(The invention relates to a protection device for a hydraulic system of a coal mining machine, which comprises: the outer cover is used for covering the hydraulic system to prevent the gangue from falling into the hydraulic system to damage the hydraulic system; the scraper is used for scraping the coal gangue falling on the upper surface of the outer cover; a fixed pipe for maintaining the temperature of the hydraulic system in the housing; a heat sink for absorbing heat generated by the hydraulic system; the air suction pipe is used for transporting the heat of the hydraulic system absorbed by the radiating fins; the cooling fan is used for cooling the heat transported by the suction pipe; and the clamping block is used for fixing an oil pipe of the hydraulic system. Therefore, the coal gangue can be effectively prevented from falling off from the top plate, hydraulic fittings and pipelines on the unit are broken or buried, potential safety hazards are reduced, and the service life of a hydraulic system is prolonged.)
1. The utility model provides a coal-winning machine hydraulic system protection device which characterized in that includes:
the outer cover is connected with the scraper and used for preventing the coal gangue from falling into the hydraulic system to damage the hydraulic system, and the upper surface of the outer cover is provided with a weight detector and used for measuring the weight borne by the upper surface of the outer cover in real time; before the hydraulic system operates, the central control module sets a preset bearable weight value of the outer cover according to the bearing capacity of the outer cover; when the hydraulic system runs, the central control module compares the measured value of the weight detector with a preset outer cover bearable weight value to judge whether the central control module needs to control a scraper to scrape the coal gangue on the upper surface of the outer cover;
the scraping plate is connected with the outer cover, arranged at the upper end of the side surface of the outer cover and used for scraping coal gangue falling on the upper surface of the outer cover;
the fixed pipe is connected with the outer cover and used for keeping the temperature of a hydraulic system in the outer cover, and a temperature detector is arranged in the fixed pipe and used for detecting the temperature in the outer cover in real time; before the hydraulic system operates, the central control module sets an overheating protection value according to the bearing capacity of the hydraulic system; when the hydraulic system operates, the central control module compares the measured value of the temperature detector with an overheat protection value to judge whether the central control module needs to control the radiating fins to absorb heat or not;
a heat sink disposed within the fixed tube to absorb heat generated by the hydraulic system;
the air suction pipe is connected with the fixed pipe and is used for transporting the heat absorbed by the radiating fins;
the cooling fan is connected with the air suction pipe and used for cooling heat output by the air suction pipe;
the clamping block is connected with the hydraulic system and used for fixing an oil pipe of the hydraulic system, and an extrusion force sensor is arranged on the clamping block and used for converting the extrusion force borne by the oil pipe into a usable output signal and transmitting the usable output signal to the central control module; before the hydraulic system operates, the central control module sets a preset bearable extrusion pressure value according to the force required by the extrusion deformation of the oil pipe; when the hydraulic system runs, the central control module reads a signal output by the extrusion force sensor to obtain an actual extrusion pressure value borne by an oil pipe, and compares the actual extrusion pressure value with a preset bearable extrusion pressure value to determine whether an alarm needs to be sent;
the central control module is connected with each component in the protection device respectively and used for sequentially adjusting the operation parameters of each component to corresponding values when the protection device operates;
the central control module is provided with a preset outer cover bearable weight difference value matrix delta m0 and a preset scraper thrust matrix N0; setting a delta m0 (delta m1, delta m2 and delta m3) for the preset housing bearable weight difference matrix delta m0, wherein delta m1 represents a first difference value of the preset housing bearable weight, delta m2 represents a second difference value of the preset housing bearable weight, delta m3 represents a third difference value of the preset housing bearable weight, and delta m1 < deltam 2 < deltam 3; for the preset scraper thrust matrix N0, N0(N1, N2, N3, N4) is set, where N1 denotes a preset scraper first thrust, N2 denotes a preset scraper second thrust, N3 denotes a preset scraper third thrust, N4 denotes a preset scraper fourth thrust, N1 < N2 < N3 < N4;
when the coal gangue falls on the upper surface of the outer cover, the actual bearing weight value of the outer cover measured by the weight detector is m, and meanwhile, the central control module sets a preset outer cover bearing weight value as m0 according to the bearing capacity of the outer cover;
when the hydraulic system is operated, the central control module compares the actual bearing weight value m of the housing with a preset housing bearing weight value m 0:
if m is less than or equal to m0, the central control module judges that a scraper is not required to be controlled to scrape the coal gangue on the upper surface of the outer cover;
if m is larger than m0, the central control module judges that a scraper needs to be controlled to scrape the coal gangue on the upper surface of the outer cover;
when the central control module judges that the scraper needs to be controlled to scrape the coal gangue on the upper surface of the outer cover, the central control module calculates the bearing weight difference Delta m of the outer cover and compares the bearing weight difference Delta m with the parameters in a preset outer cover bearing weight difference matrix Delta m0,
if Deltam is less than Deltam 1, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover with the force of N1;
if the Deltam is more than or equal to Deltam 1 and less than Deltam 2, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover by the force of N2;
if the Deltam is more than or equal to Deltam 2 and less than Deltam 3, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover by the force of N3;
if the Deltam is more than or equal to Deltam 3, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover with the force of N4;
wherein the difference Δ m in the weight borne by the cover is calculated as follows,
△m＝(m-m0)×δa；
wherein δ a represents a cover bearing weight coefficient, δ a ═ m/m0 × [ (m + m0)/(m-m0) ].
2. The protection device for the hydraulic system of the coal mining machine according to claim 1, characterized in that when the hydraulic system is in operation, the temperature detector records the measured actual temperature value as β, and the central control module sets the overheat protection value as β 0 according to the bearing capacity of the hydraulic system;
when the temperature detector detects an actual temperature beta and the central control module sets the overheating protection value as beta 0, the central control module compares the actual temperature value beta with the overheating protection value beta 0:
if beta is less than or equal to beta 0, the central control module judges that the heat sink does not need to be controlled to absorb heat;
and if the beta is larger than the beta 0, the central control module judges that the heat radiating fins need to be controlled to absorb heat.
3. The protection device for the hydraulic system of the coal mining machine according to claim 2, characterized in that the central control module is further provided with a preset temperature difference matrix Δ β 0 and a preset heat sink power matrix P0; setting delta beta 0 (delta beta 1, delta beta 2, delta beta 3) for the preset temperature difference matrix delta beta 0, wherein delta beta 1 represents a preset first temperature difference value, delta beta 2 represents a preset second temperature difference value, delta beta 3 represents a preset third temperature difference value, and delta beta 1 is smaller than delta beta 2 is smaller than delta beta 3; setting PO (P1, P2, P3 and P4) for the preset heat sink power matrix P0, wherein P1 represents a preset heat sink first power, P2 represents a preset heat sink second power, P3 represents a preset heat sink third power, P4 represents a preset heat sink fourth power, P1 < P2 < P3 < P4;
when the central control module judges that the heat absorption of the radiating fins needs to be controlled, the central control module calculates a temperature difference value delta beta and compares the temperature difference value delta beta with parameters in a preset temperature difference value matrix delta beta 0:
if delta beta is less than delta beta 1, the central control module controls the radiating fin to absorb heat generated by the hydraulic system at a preset radiating fin first power P1;
if the delta beta 1 is more than or equal to the delta beta and less than the delta beta 2, the central control module controls the radiating fins to absorb the heat generated by the hydraulic system with preset radiating fin second power P2;
if delta beta 2 is more than or equal to delta beta and less than delta beta 3, the central control module controls the radiating fins to absorb heat generated by the hydraulic system with preset radiating fin third power P3;
if the delta beta is more than or equal to the delta beta 3, the central control module controls the radiating fins to absorb the heat generated by the hydraulic system at a preset radiating fin fourth power P4.
4. The protection device for the hydraulic system of the coal mining machine according to claim 3, characterized in that the central control module is further provided with a preset actual bearing value matrix M0 and a preset heat dissipation power adjustment coefficient matrix e 0; for the preset actual bearing value matrix M0, setting M0(M1, M2, M3), wherein M1 represents a preset actual first bearing value, M2 represents a preset actual second bearing value, M3 represents a preset actual third bearing value, and M1 < M2 < M3; for the preset heat dissipation power adjustment coefficient matrix e0, setting e0(e1, e2, e3, e4), wherein e1 represents a first preset heat dissipation power adjustment coefficient, e2 represents a second preset heat dissipation power adjustment coefficient, e3 represents a third preset heat dissipation power adjustment coefficient, and e4 represents a fourth preset heat dissipation power adjustment coefficient;
when the coal gangue falls on the upper surface of the outer cover, the central control module compares the actual bearing weight value M of the outer cover with the parameters in a preset actual bearing value matrix M0:
if M is less than M1, the central control module selects e1 to correct the ith power Pi of the preset radiating fin;
if M is not less than M2 and not more than M1, the central control module selects e2 to correct the ith power Pi of the preset radiating fin;
if M is not less than M3 and not more than M2, the central control module selects e3 to correct the ith power Pi of the preset radiating fin;
if m is larger than m3, the central control module selects e4 to correct the ith power Pi of the preset radiating fin;
when the central control module selects ej to correct Pi, setting j to be 1,2,3,4 and i to be 1,2,3,4, and the central control module calculates the corrected fin power to be Pi ', and sets Pi' to be Pi multiplied by ej.
5. The protecting device for the hydraulic system of the coal mining machine according to claim 4, characterized in that when the central control module controls the heat radiating fins to absorb the heat generated by the hydraulic system at the ith power Pi of the preset heat radiating fins, i is set to be 1,2,3,4, and the central control module calculates the time T for starting the heat radiating fins to absorb the heat according to the actual temperature value β, and the calculation formula is as follows:
T＝β/Pi。
6. the protection device for the hydraulic system of the coal mining machine according to claim 4, wherein when the central control module determines that the heat radiating fins need to be controlled to absorb heat, the central control module calculates a temperature difference coefficient δ b according to a housing bearing weight coefficient δ a, and the calculation formula is as follows:
δb＝0.5×δa×(β/β0)；
after the calculation is finished, the central control module calculates the temperature difference value delta beta according to the temperature difference coefficient delta b, the calculation formula is as follows,
△β＝(β-β0)×δb；
in the formula, β represents an actual temperature value measured by the temperature detector, and β 0 represents an overheat protection value.
7. The protection device for the hydraulic system of the coal mining machine according to claim 1, wherein when the hydraulic system is in operation, the actual extrusion pressure value transmitted to the central control module by the extrusion pressure sensor is J, and meanwhile, the central control module sets a preset bearable extrusion pressure value to be J0 according to the force required by the extrusion deformation of the oil pipe;
when the hydraulic system operates, the central control module compares an actual extrusion pressure value J with a preset bearable extrusion pressure value J0:
if J is less than or equal to J0, the central control module judges that an alarm does not need to be sent out;
if J > J0, the central control module determines that an alarm needs to be raised.
8. The protection device for the hydraulic system of the coal mining machine according to claim 7, characterized in that the central control module is further provided with a preset extrusion force difference interval matrix Δ J0 and a preset time period matrix t 0;
for the preset extrusion force difference interval matrix delta J0, delta J0 (delta J1, delta J2, delta J3 and delta J4) is set, wherein delta J1 represents a first difference interval of preset extrusion force, delta J2 represents a second difference interval of preset extrusion force, delta J3 represents a third difference interval of preset extrusion force, delta J4 represents a fourth difference interval of preset extrusion force, and the numerical ranges of the areas are not overlapped;
for the preset time period matrix t0, t0(t1, t2, t3) is set, where t1 represents a first time period, t2 represents a second time period, t3 represents a third time period, 0 < t1 < t2 < t 3;
when the central control module judges that an alarm needs to be sent out, the central control module calculates an extrusion force difference value delta J and matches the extrusion force difference value delta J with parameters in a preset extrusion force difference value interval matrix delta J0:
if the delta J is within the range of delta J1, the central control module judges that an alarm is sent out immediately;
if the delta J is within the range of the delta J2, the central control module judges that an alarm is given out after a first time period t 1;
if the delta J is within the range of the delta J3, the central control module judges that an alarm is given out after a second time period t 2;
and if the delta J is within the range of the delta J4, the central control module judges that an alarm is given after a third time period t 3.
9. The protection device for the hydraulic system of the coal mining machine according to claim 6, wherein when the central control module determines that an alarm needs to be sent, the central control module calculates a squeezing force difference value delta J by combining a housing bearing weight coefficient delta a and a temperature difference coefficient delta b, and the calculation formula is as follows:
△J＝(J-J0)×(δa/δb)；
wherein J represents an actual squeezing pressure value, and J0 represents a preset sustainable squeezing pressure value.
10. The shearer hydraulic system protection device of claim 1, wherein the protection device further comprises:
the protective cylinder is connected with the air suction pipe and used for preventing the heat absorbed by the radiating fins from diffusing;
the connecting piece is respectively connected with the air suction pipe and the fixed pipe and is used for connecting the air suction pipe and the fixed pipe together;
the base is respectively connected with the cooling fan and the adjusting rod and used for supporting the protection device;
the adjusting rod is respectively connected with the base and the clamping block and used for fixing oil pipes at different positions;
the bolt is connected with the clamping block, and the oil pipe can be fixed by screwing the bolt to enable the inner surface walls on the two sides of the clamping block to mutually extrude the oil pipe;
and the alarm is connected with the clamping block and used for giving an alarm to remind people to check the oil pipe when the central control module judges that an alarm needs to be given.
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a protection device for a hydraulic system of a coal mining machine.
Background
The coal mining machine is one of important equipment for realizing mechanization and modernization of coal mine production, is a large-scale complex system integrating machinery, electricity and hydraulic pressure, has a severe working environment, and can cause interruption of the whole coal mining work if a fault occurs, thereby causing huge economic loss.
The hydraulic system of the coal mining machine has the function of increasing acting force by changing pressure intensity. A complete hydraulic system consists of five parts, namely a power element, an actuator, a control element, an auxiliary element (attachment) and hydraulic oil. Hydraulic systems can be divided into two categories, hydraulic transmission systems and hydraulic control systems. Hydraulic drive systems have as a primary function the transmission of power and motion. Hydraulic control systems are designed to provide a hydraulic system output that meets specific performance requirements (particularly dynamic performance), and are generally referred to as hydraulic drive systems.
The existing hydraulic system of the coal mining machine is exposed outside, and in the cutting process, because of vibration generated by a roller, coal and gangue are always blown off from a top plate, hydraulic fittings and pipelines on a unit are broken or buried, and serious potential safety hazards exist.
Disclosure of Invention
Therefore, the protection device for the hydraulic system of the coal mining machine provided by the invention can effectively solve the technical problems of high potential safety hazard and short service life of the hydraulic system caused by the fact that the coal and gangue fall from the top plate and the hydraulic fittings and pipelines on the unit are broken or buried.
In order to achieve the above object, the present invention provides a protection device for a hydraulic system of a coal mining machine, comprising:
the outer cover is connected with the scraper and used for preventing the coal gangue from falling into the hydraulic system to damage the hydraulic system, and the upper surface of the outer cover is provided with a weight detector and used for measuring the weight borne by the upper surface of the outer cover in real time; before the hydraulic system operates, the central control module sets a preset bearable weight value of the outer cover according to the bearing capacity of the outer cover; when the hydraulic system runs, the central control module compares the measured value of the weight detector with a preset outer cover bearable weight value to judge whether the central control module needs to control a scraper to scrape the coal gangue on the upper surface of the outer cover;
the scraping plate is connected with the outer cover, arranged at the upper end of the side surface of the outer cover and used for scraping coal gangue falling on the upper surface of the outer cover;
the fixed pipe is connected with the outer cover and used for keeping the temperature of a hydraulic system in the outer cover, and a temperature detector is arranged in the fixed pipe and used for detecting the temperature in the outer cover in real time; before the hydraulic system operates, the central control module sets an overheating protection value according to the bearing capacity of the hydraulic system; when the hydraulic system operates, the central control module compares the measured value of the temperature detector with an overheat protection value to judge whether the central control module needs to control the radiating fins to absorb heat or not;
a heat sink disposed within the fixed tube to absorb heat generated by the hydraulic system;
the air suction pipe is connected with the fixed pipe and is used for transporting the heat absorbed by the radiating fins;
the cooling fan is connected with the air suction pipe and used for cooling heat output by the air suction pipe;
the clamping block is connected with the hydraulic system and used for fixing an oil pipe of the hydraulic system, and an extrusion force sensor is arranged on the clamping block and used for converting the extrusion force borne by the oil pipe into a usable output signal and transmitting the usable output signal to the central control module; before the hydraulic system operates, the central control module sets a preset bearable extrusion pressure value according to the force required by the extrusion deformation of the oil pipe; when the hydraulic system runs, the central control module reads a signal output by the extrusion force sensor to obtain an actual extrusion pressure value borne by an oil pipe, and compares the actual extrusion pressure value with a preset bearable extrusion pressure value to determine whether an alarm needs to be sent;
the central control module is connected with each component in the protection device respectively and used for sequentially adjusting the operation parameters of each component to corresponding values when the protection device operates;
the central control module is provided with a preset outer cover bearable weight difference value matrix delta m0 and a preset scraper thrust matrix N0; setting a delta m0 (delta m1, delta m2 and delta m3) for the preset housing bearable weight difference matrix delta m0, wherein delta m1 represents a first difference value of the preset housing bearable weight, delta m2 represents a second difference value of the preset housing bearable weight, delta m3 represents a third difference value of the preset housing bearable weight, and delta m1 < deltam 2 < deltam 3; for the preset scraper thrust matrix N0, N0(N1, N2, N3, N4) is set, where N1 denotes a preset scraper first thrust, N2 denotes a preset scraper second thrust, N3 denotes a preset scraper third thrust, N4 denotes a preset scraper fourth thrust, N1 < N2 < N3 < N4;
when the coal gangue falls on the upper surface of the outer cover, the actual bearing weight value of the outer cover measured by the weight detector is m, and meanwhile, the central control module sets a preset outer cover bearing weight value as m0 according to the bearing capacity of the outer cover;
when the hydraulic system is operated, the central control module compares the actual bearing weight value m of the housing with a preset housing bearing weight value m 0:
if m is less than or equal to m0, the central control module judges that a scraper is not required to be controlled to scrape the coal gangue on the upper surface of the outer cover;
if m is larger than m0, the central control module judges that a scraper needs to be controlled to scrape the coal gangue on the upper surface of the outer cover;
when the central control module judges that the scraper needs to be controlled to scrape the coal gangue on the upper surface of the outer cover, the central control module calculates the bearing weight difference Delta m of the outer cover and compares the bearing weight difference Delta m with the parameters in a preset outer cover bearing weight difference matrix Delta m0,
if Deltam is less than Deltam 1, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover with the force of N1;
if the Deltam is more than or equal to Deltam 1 and less than Deltam 2, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover by the force of N2;
if the Deltam is more than or equal to Deltam 2 and less than Deltam 3, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover by the force of N3;
if the Deltam is more than or equal to Deltam 3, the central control module controls the scraper to scrape the coal gangue on the upper surface of the outer cover with the force of N4;
wherein the difference Δ m in the weight borne by the cover is calculated as follows,
△m＝(m-m0)×δa；
wherein δ a represents a cover bearing weight coefficient, δ a ═ m/m0 × [ (m + m0)/(m-m0) ].
Further, when the hydraulic system runs, the temperature detector records the measured actual temperature value as beta, and the central control module sets the overheating protection value as beta 0 according to the bearing capacity of the hydraulic system;
when the temperature detector detects an actual temperature beta and the central control module sets the overheating protection value as beta 0, the central control module compares the actual temperature value beta with the overheating protection value beta 0:
if beta is less than or equal to beta 0, the central control module judges that the heat sink does not need to be controlled to absorb heat;
and if the beta is larger than the beta 0, the central control module judges that the heat radiating fins need to be controlled to absorb heat.
Further, the central control module is also provided with a preset temperature difference matrix delta beta 0 and a preset cooling fin power matrix P0; setting delta beta 0 (delta beta 1, delta beta 2, delta beta 3) for the preset temperature difference matrix delta beta 0, wherein delta beta 1 represents a preset first temperature difference value, delta beta 2 represents a preset second temperature difference value, delta beta 3 represents a preset third temperature difference value, and delta beta 1 is smaller than delta beta 2 is smaller than delta beta 3; setting PO (P1, P2, P3 and P4) for the preset heat sink power matrix P0, wherein P1 represents a preset heat sink first power, P2 represents a preset heat sink second power, P3 represents a preset heat sink third power, P4 represents a preset heat sink fourth power, P1 < P2 < P3 < P4;
when the central control module judges that the heat absorption of the radiating fins needs to be controlled, the central control module calculates a temperature difference value delta beta and compares the temperature difference value delta beta with parameters in a preset temperature difference value matrix delta beta 0:
if delta beta is less than delta beta 1, the central control module controls the radiating fin to absorb heat generated by the hydraulic system at a preset radiating fin first power P1;
if the delta beta 1 is more than or equal to the delta beta and less than the delta beta 2, the central control module controls the radiating fins to absorb the heat generated by the hydraulic system with preset radiating fin second power P2;
if delta beta 2 is more than or equal to delta beta and less than delta beta 3, the central control module controls the radiating fins to absorb heat generated by the hydraulic system with preset radiating fin third power P3;
if the delta beta is more than or equal to the delta beta 3, the central control module controls the radiating fins to absorb the heat generated by the hydraulic system at a preset radiating fin fourth power P4.
Furthermore, the central control module is also provided with a preset actual bearing value matrix M0 and a preset heat dissipation power adjustment coefficient matrix e 0; for the preset actual bearing value matrix M0, setting M0(M1, M2, M3), wherein M1 represents a preset actual first bearing value, M2 represents a preset actual second bearing value, M3 represents a preset actual third bearing value, and M1 < M2 < M3; for the preset heat dissipation power adjustment coefficient matrix e0, setting e0(e1, e2, e3, e4), wherein e1 represents a first preset heat dissipation power adjustment coefficient, e2 represents a second preset heat dissipation power adjustment coefficient, e3 represents a third preset heat dissipation power adjustment coefficient, and e4 represents a fourth preset heat dissipation power adjustment coefficient;
when the coal gangue falls on the upper surface of the outer cover, the central control module compares the actual bearing weight value M of the outer cover with the parameters in a preset actual bearing value matrix M0:
if M is less than M1, the central control module selects e1 to correct the ith power Pi of the preset radiating fin;
if M is not less than M2 and not more than M1, the central control module selects e2 to correct the ith power Pi of the preset radiating fin;
if M is not less than M3 and not more than M2, the central control module selects e3 to correct the ith power Pi of the preset radiating fin;
if m is larger than m3, the central control module selects e4 to correct the ith power Pi of the preset radiating fin;
when the central control module selects ej to correct Pi, setting j to be 1,2,3,4 and i to be 1,2,3,4, and the central control module calculates the corrected fin power to be Pi ', and sets Pi' to be Pi multiplied by ej.
Further, when the central control module controls the heat radiating fins to absorb the heat generated by the hydraulic system with the preset i-th power Pi of the heat radiating fins, i is set to 1,2,3,4, and the central control module calculates the time T for starting the heat radiating fins to absorb the heat according to the actual temperature value β, and the calculation formula is as follows:
T＝β/Pi。
further, when the central control module determines that the heat sink needs to be controlled to absorb heat, the central control module calculates a temperature difference coefficient δ b according to the outer cover bearing weight coefficient δ a, and the calculation formula is as follows:
δb＝0.5×δa×(β/β0)；
after the calculation is finished, the central control module calculates the temperature difference value delta beta according to the temperature difference coefficient delta b, the calculation formula is as follows,
△β＝(β-β0)×δb；
in the formula, β represents an actual temperature value measured by the temperature detector, and β 0 represents an overheat protection value.
Further, when the hydraulic system is in operation, the actual extrusion pressure value transmitted to the central control module by the extrusion force sensor is J, and meanwhile, the central control module sets a preset bearable extrusion pressure value to be J0 according to the force required by the extrusion deformation of the oil pipe;
when the hydraulic system operates, the central control module compares an actual extrusion pressure value J with a preset bearable extrusion pressure value J0:
if J is less than or equal to J0, the central control module judges that an alarm does not need to be sent out;
if J > J0, the central control module determines that an alarm needs to be raised.
Further, the central control module is further provided with a preset extrusion force difference value interval matrix delta J0 and a preset time period matrix t 0;
for the preset extrusion force difference interval matrix delta J0, delta J0 (delta J1, delta J2, delta J3 and delta J4) is set, wherein delta J1 represents a first difference interval of preset extrusion force, delta J2 represents a second difference interval of preset extrusion force, delta J3 represents a third difference interval of preset extrusion force, delta J4 represents a fourth difference interval of preset extrusion force, and the numerical ranges of the areas are not overlapped;
for the preset time period matrix t0, t0(t1, t2, t3) is set, where t1 represents a first time period, t2 represents a second time period, t3 represents a third time period, 0 < t1 < t2 < t 3;
when the central control module judges that an alarm needs to be sent out, the central control module calculates an extrusion force difference value delta J and matches the extrusion force difference value delta J with parameters in a preset extrusion force difference value interval matrix delta J0:
if the delta J is within the range of delta J1, the central control module judges that an alarm is sent out immediately;
if the delta J is within the range of the delta J2, the central control module judges that an alarm is given out after a first time period t 1;
if the delta J is within the range of the delta J3, the central control module judges that an alarm is given out after a second time period t 2;
and if the delta J is within the range of the delta J4, the central control module judges that an alarm is given after a third time period t 3.
Further, when the central control module determines that an alarm needs to be sent, the central control module calculates an extrusion force difference value delta J by combining a bearing weight coefficient delta a and a temperature difference coefficient delta b of the outer cover, and the calculation formula is as follows:
△J＝(J-J0)×(δa/δb)；
wherein J represents an actual squeezing pressure value, and J0 represents a preset sustainable squeezing pressure value.
Further, the protection device further comprises:
the protective cylinder is connected with the air suction pipe and used for preventing the heat absorbed by the radiating fins from diffusing;
the connecting piece is respectively connected with the air suction pipe and the fixed pipe and is used for connecting the air suction pipe and the fixed pipe together;
the base is respectively connected with the cooling fan and the adjusting rod and used for supporting the protection device;
the adjusting rod is respectively connected with the base and the clamping block and used for fixing oil pipes at different positions;
the bolt is connected with the clamping block, and the oil pipe can be fixed by screwing the bolt to enable the inner surface walls on the two sides of the clamping block to mutually extrude the oil pipe;
and the alarm is connected with the clamping block and used for giving an alarm to remind people to check the oil pipe when the central control module judges that an alarm needs to be given.
Compared with the prior art, the invention has the beneficial effects that the measured value of the weight detector is compared with the preset outer cover bearable weight value to judge whether the central control module needs to control the scraper to scrape the coal gangue on the upper surface of the outer cover, the measured value of the temperature detector is compared with the overheat protection value to judge whether the central control module needs to control the radiating fins to absorb heat, the actual extrusion pressure value is compared with the preset bearable extrusion pressure value to determine whether an alarm needs to be sent, and the borne weight difference value Delta m is compared with the parameters in the preset outer cover weight difference value matrix Delta m0 to determine the force path of the scraper, so that the coal gangue falling from a top plate can be effectively prevented, hydraulic fittings and pipelines on a unit are crushed or buried, the potential safety hazard is reduced, and the service life of a hydraulic system is prolonged.
Furthermore, the invention compares the actual temperature value beta with the overheating protection value beta 0 to judge whether the radiating fins need to be started to absorb heat, thereby accurately controlling the radiating condition, saving energy and improving the radiating effect.
Furthermore, the temperature difference value delta beta is matched with the parameters in the preset temperature difference value matrix delta beta 0 to determine the heat absorption power of the heat dissipation sheet, so that the heat on the hydraulic system equipment can be quickly absorbed on the premise of saving resources, and the heat dissipation effect is good.
Further, the invention compares the actual extrusion pressure value J with the preset bearable extrusion pressure value J0 to determine whether an alarm needs to be given, thereby reducing the hidden danger and prolonging the service life of the hydraulic system.
Furthermore, the time for sending the alarm is determined by matching the extrusion force difference value delta J with the parameters in the preset extrusion force difference value interval matrix delta J0, so that the hidden danger can be reduced, and the service life of the hydraulic system is prolonged.
Furthermore, the protection cylinder can effectively prevent heat absorbed by the radiating fins from diffusing, and the alarm can timely remind people to check the oil pipe, so that coal gangue falling from the top plate can be effectively prevented, hydraulic fittings and pipelines on the unit can be prevented from being broken or buried, potential safety hazards are reduced, and the service life of a hydraulic system is prolonged.
Drawings
Fig. 1 is a schematic front view of a protection device of a hydraulic system of a coal mining machine according to the present invention;
FIG. 2 is a schematic side view of a stationary tube of the protection device for a hydraulic system of a coal mining machine according to the present invention;
fig. 3 is a schematic structural view of a housing of the hydraulic system protection device of the coal mining machine of the present invention;
FIG. 4 is a schematic diagram of a side view of a clamp block of the protection device for the hydraulic system of the coal mining machine according to the present invention;
the notation in the figure is: 1. an air suction pipe; 2. a connecting member; 3. a fixed tube; 4. a protective cylinder; 5. a cooling fan; 6. a base; 7. a heat sink; 8. adjusting a rod; 9. a clamping block; 10. a bolt; 11. an alarm; 12. a housing; 13. a scraper.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1,2,3 and 4, the present invention provides a protection device for a hydraulic system of a coal mining machine, including:
the outer cover 12 is connected with the scraper 13 and used for preventing the coal gangue from falling into the hydraulic system to damage the hydraulic system, and the weight detector is arranged on the upper surface of the outer cover 12 and used for measuring the weight borne by the upper surface of the outer cover 12 in real time; before the hydraulic system operates, the central control module sets a preset bearable weight value of the outer cover 12 according to the bearing capacity of the outer cover 12; when the hydraulic system is operated, the central control module compares the measured value of the weight detector with a preset bearable weight value of the outer cover 12 to judge whether the central control module needs to control the scraper 13 to scrape the coal gangue on the upper surface of the outer cover 12;
the scraping plate 13 is connected with the outer cover 12, is arranged at the upper end of the side surface of the outer cover 12 and is used for scraping coal gangue falling on the upper surface of the outer cover 12;
the fixed pipe 3 is connected with the outer cover 12 and used for keeping the temperature of a hydraulic system in the outer cover 12, and a temperature detector is arranged in the fixed pipe 3 and used for detecting the temperature in the outer cover 12 in real time; before the hydraulic system operates, the central control module sets an overheating protection value according to the bearing capacity of the hydraulic system; when the hydraulic system is operated, the central control module compares the measured value of the temperature detector with an overheat protection value to judge whether the central control module needs to control the radiating fins 7 to absorb heat or not;
a fin 7 provided in the fixed tube 3 to absorb heat generated by the hydraulic system;
the air suction pipe 1 is connected with the fixed pipe 3 and is used for transporting heat absorbed by the radiating fins 7;
the cooling fan 5 is connected with the air suction pipe 1 and used for cooling heat output by the air suction pipe 1;
the clamping block 9 is connected with the hydraulic system and used for fixing an oil pipe of the hydraulic system, and an extrusion force sensor is arranged on the clamping block 9 and used for converting the extrusion force borne by the oil pipe into a usable output signal and then transmitting the usable output signal to the central control module; before the hydraulic system operates, the central control module sets a preset bearable extrusion pressure value according to the force required by the extrusion deformation of the oil pipe; when the hydraulic system runs, the central control module reads a signal output by the extrusion force sensor to obtain an actual extrusion pressure value borne by an oil pipe, and compares the actual extrusion pressure value with a preset bearable extrusion pressure value to determine whether an alarm needs to be sent;
the central control module is connected with each component in the protection device respectively and used for sequentially adjusting the operation parameters of each component to corresponding values when the protection device operates;
the central control module is provided with a preset weight difference matrix Delta m0 bearable by the outer cover 12 and a preset scraper 13 thrust matrix N0; for the weight difference matrix Δ m0 bearable by the preset housing 12, Δ m0(Δ m1, Δ m2, Δ m3) is set, wherein Δ m1 represents a first difference in the weight bearable by the preset housing 12, Δ m2 represents a second difference in the weight bearable by the preset housing 12, Δ m3 represents a third difference in the weight bearable by the preset housing 12, and Δ m1 < [ delta ] m2 < [ delta ] m 3; for the preset scraper 13 thrust matrix N0, N0(N1, N2, N3, N4) is set, where N1 represents a preset scraper 13 first thrust, N2 represents a preset scraper 13 second thrust, N3 represents a preset scraper 13 third thrust, N4 represents a preset scraper 13 fourth thrust, N1 < N2 < N3 < N4;
when the coal gangue falls on the upper surface of the outer cover 12, the actual bearing weight value of the outer cover 12 measured by the weight detector is m, and meanwhile, the central control module sets the preset bearing weight value of the outer cover 12 to m0 according to the bearing capacity of the outer cover 12;
when the hydraulic system is in operation, the central control module compares the actual bearing weight value m of the housing 12 with the preset bearing weight value m0 of the housing 12:
if m is less than or equal to m0, the central control module judges that the scraper 13 is not required to be controlled to scrape the coal gangue on the upper surface of the outer cover 12;
if m is larger than m0, the central control module judges that the scraper 13 needs to be controlled to scrape the coal gangue on the upper surface of the outer cover 12;
when the central control module judges that the scraper 13 needs to be controlled to scrape the coal gangue on the upper surface of the outer cover 12, the central control module calculates the bearing weight difference Deltam of the outer cover 12 and compares the bearing weight difference Deltam with the parameters in a preset bearing weight difference matrix Deltam 0 of the outer cover 12,
if Deltam is less than Deltam 1, the central control module controls the scraper 13 to scrape coal gangue on the upper surface of the outer cover 12 with the force of N1;
if the Deltam is more than or equal to Deltam 1 and less than Deltam 2, the central control module controls the scraper 13 to scrape the coal gangue on the upper surface of the outer cover 12 by the force of N2;
if the Deltam is more than or equal to Deltam 2 and less than Deltam 3, the central control module controls the scraper 13 to scrape the coal gangue on the upper surface of the outer cover 12 by the force of N3;
if the Deltam is more than or equal to Deltam 3, the central control module controls the scraper 13 to scrape the coal gangue on the upper surface of the outer cover 12 with the force of N4;
wherein the bearing weight difference Deltam of the outer cover 12 is calculated as follows,
△m＝(m-m0)×δa；
where δ a represents a weight coefficient of the housing 12, and δ a is (m/m0) × [ (m + m0)/(m-m0) ].
According to the embodiment of the invention, the measured value of the weight detector is compared with the preset bearable weight value of the outer cover 12 to judge whether the central control module needs to control the scraper 13 to scrape the coal gangue on the upper surface of the outer cover 12, the measured value of the temperature detector is compared with the overheat protection value to judge whether the central control module needs to control the heat radiation fins 7 to absorb heat, the actual extrusion pressure value is compared with the preset bearable extrusion pressure value to determine whether an alarm needs to be sent, and the borne weight difference value delta m is compared with the parameter in the bearable weight difference matrix delta m0 of the preset outer cover 12 to determine the force path of the scraper 13, so that the coal gangue falling from a top plate can be effectively prevented, hydraulic fittings and pipelines on a unit are broken or buried, the potential safety hazard is reduced, and the service life of a hydraulic system is prolonged.
Specifically, when the hydraulic system operates, the temperature detector records the measured actual temperature value as beta, and the central control module sets the overheat protection value as beta 0 according to the bearing capacity of the hydraulic system;
when the temperature detector detects an actual temperature beta and the central control module sets the overheating protection value as beta 0, the central control module compares the actual temperature value beta with the overheating protection value beta 0:
if beta is less than or equal to beta 0, the central control module judges that the heat sink 7 does not need to be controlled to absorb heat;
if β > β 0, the central control module determines that it is necessary to control the heat sink 7 to absorb heat.
According to the embodiment of the invention, the actual temperature value beta is compared with the overheating protection value beta 0 to judge whether the heat sink 7 needs to be started to absorb heat, so that the heat dissipation condition can be accurately controlled, the energy is saved, and the heat dissipation effect is improved.
Specifically, the central control module is further provided with a preset temperature difference matrix delta beta 0 and a preset heat sink 7 power matrix P0; setting delta beta 0 (delta beta 1, delta beta 2, delta beta 3) for the preset temperature difference matrix delta beta 0, wherein delta beta 1 represents a preset first temperature difference, delta beta 2 represents a preset second temperature difference, delta beta 3 represents a preset third temperature difference, and delta beta 1 is smaller than delta beta 2 is smaller than delta beta 3; setting PO (P1, P2, P3 and P4) for the preset heat sink 7 power matrix P0, wherein P1 represents a preset heat sink 7 first power, P2 represents a preset heat sink 7 second power, P3 represents a preset heat sink 7 third power, P4 represents a preset heat sink 7 fourth power, P1 < P2 < P3 < P4;
when the central control module determines that the heat sink 7 needs to be controlled to absorb heat, the central control module calculates a temperature difference value delta beta and compares the temperature difference value delta beta with parameters in a preset temperature difference value matrix delta beta 0:
if delta beta is less than delta beta 1, the central control module controls the radiating fin 7 to preset a first power P1 of the radiating fin 7 to absorb heat generated by the hydraulic system;
if the delta beta 1 is more than or equal to the delta beta and less than the delta beta 2, the central control module controls the radiating fins 7 to absorb the heat generated by the hydraulic system with preset second power P2 of the radiating fins 7;
if delta beta 2 is more than or equal to delta beta and less than delta beta 3, the central control module controls the radiating fins 7 to preset third power P3 of the radiating fins 7 to absorb heat generated by the hydraulic system;
if Δ β is greater than or equal to Δ β 3, the central control module controls the heat sink 7 to preset a fourth power P4 of the heat sink 7 to absorb heat generated by the hydraulic system.
According to the embodiment of the invention, the power of the heat absorption of the heat sink 7 is determined by matching the temperature difference delta beta with the parameters in the preset temperature difference matrix delta beta 0, so that the heat on the hydraulic system equipment can be absorbed rapidly on the premise of saving resources, and the heat dissipation effect is good.
Specifically, the central control module is further provided with a preset actual bearing value matrix M0 and a preset heat dissipation power adjustment coefficient matrix e 0; for the preset actual bearing value matrix M0, setting M0(M1, M2, M3), wherein M1 represents a preset actual first bearing value, M2 represents a preset actual second bearing value, M3 represents a preset actual third bearing value, and M1 < M2 < M3; for the preset heat dissipation power adjustment coefficient matrix e0, setting e0(e1, e2, e3, e4), wherein e1 represents a first preset heat dissipation power adjustment coefficient, e2 represents a second preset heat dissipation power adjustment coefficient, e3 represents a third preset heat dissipation power adjustment coefficient, and e4 represents a fourth preset heat dissipation power adjustment coefficient;
when the coal gangue falls on the upper surface of the outer cover 12, the central control module compares the actual bearing weight value M of the outer cover 12 with the parameters in a preset actual bearing value matrix M0:
if M is less than M1, the central control module selects e1 to correct the ith power Pi of the preset radiating fin 7;
if M is not less than M2 and not more than M1, the central control module selects e2 to correct the ith power Pi of the preset radiating fin 7;
if M is not less than M3 and not more than M2, the central control module selects e3 to correct the ith power Pi of the preset radiating fin 7;
if m is larger than m3, the central control module selects e4 to correct the ith power Pi of the preset radiating fin 7;
when the central control module selects ej to correct Pi, setting j to be 1,2,3,4, setting i to be 1,2,3,4, and the central control module calculates the corrected power of the heat dissipation fin 7 to be Pi ', and sets Pi' to be Pi × ej.
Specifically, when the central control module controls the heat sink 7 to absorb the heat generated by the hydraulic system with the preset i-th power Pi of the heat sink 7, i is set to 1,2,3,4, and the central control module calculates the time T for starting the heat sink 7 to absorb the heat according to the actual temperature value β, and the calculation formula is as follows:
T＝β/Pi。
specifically, when the central control module determines that the heat sink 7 needs to be controlled to absorb heat, the central control module calculates a temperature difference coefficient δ b according to a weight coefficient δ a borne by the housing 12, and the calculation formula is as follows:
δb＝0.5×δa×(β/β0)；
after the calculation is finished, the central control module calculates the temperature difference value delta beta according to the temperature difference coefficient delta b, the calculation formula is as follows,
△β＝(β-β0)×δb；
in the formula, β represents an actual temperature value measured by the temperature detector, and β 0 represents an overheat protection value.
Specifically, in the operation process of the hydraulic system, the actual extrusion pressure value transmitted to the central control module by the extrusion pressure sensor is J, and meanwhile, the central control module sets a preset bearable extrusion pressure value to be J0 according to the force required by the extrusion deformation of the oil pipe;
when the hydraulic system operates, the central control module compares an actual extrusion pressure value J with a preset bearable extrusion pressure value J0:
if J is less than or equal to J0, the central control module judges that an alarm does not need to be sent out;
if J > J0, the central control module determines that an alarm needs to be raised.
According to the embodiment of the invention, the actual extrusion pressure value J is compared with the preset bearable extrusion pressure value J0 to determine whether an alarm needs to be sent or not, so that the hidden danger can be reduced, and the service life of the hydraulic system can be prolonged.
Specifically, the central control module is further provided with a preset extrusion force difference value interval matrix delta J0 and a preset time period matrix t 0;
for the preset extrusion force difference interval matrix delta J0, delta J0 (delta J1, delta J2, delta J3 and delta J4) is set, wherein delta J1 represents a first difference interval of preset extrusion force, delta J2 represents a second difference interval of preset extrusion force, delta J3 represents a third difference interval of preset extrusion force, delta J4 represents a fourth difference interval of preset extrusion force, and the numerical ranges of the areas are not overlapped;
for the preset time period matrix t0, t0(t1, t2, t3) is set, where t1 represents a first time period, t2 represents a second time period, t3 represents a third time period, 0 < t1 < t2 < t 3;
when the central control module judges that an alarm needs to be sent out, the central control module calculates an extrusion force difference value delta J and matches the extrusion force difference value delta J with parameters in a preset extrusion force difference value interval matrix delta J0:
if the delta J is within the range of delta J1, the central control module judges that an alarm is sent out immediately;
if the delta J is within the range of the delta J2, the central control module judges that an alarm is given out after a first time period t 1;
if the delta J is within the range of the delta J3, the central control module judges that an alarm is given out after a second time period t 2;
and if the delta J is within the range of the delta J4, the central control module judges that an alarm is given after a third time period t 3.
According to the embodiment of the invention, the time for sending the alarm is determined by matching the extrusion force difference value delta J with the parameters in the preset extrusion force difference value interval matrix delta J0, so that the hidden danger can be reduced, and the service life of the hydraulic system is prolonged.
Specifically, when the central control module determines that an alarm needs to be sent, the central control module calculates an extrusion force difference value Δ J in combination with a weight bearing coefficient δ a and a temperature difference value coefficient δ b of the outer cover 12, and a calculation formula is as follows:
△J＝(J-J0)×(δa/δb)；
wherein J represents an actual squeezing pressure value, and J0 represents a preset sustainable squeezing pressure value.
Specifically, the protection device further includes:
a protective cylinder 4 connected to the air suction pipe 1 for preventing heat absorbed by the heat radiating fins 7 from being diffused;
the connecting piece 2 is respectively connected with the air suction pipe 1 and the fixed pipe 3 and is used for connecting the air suction pipe 1 and the fixed pipe 3 together;
a base 6 connected to the cooling fan 5 and the adjusting lever 8, respectively, for supporting the protection device;
the adjusting rod 8 is respectively connected with the base 6 and the clamping block 9 and is used for fixing oil pipes at different positions;
the bolt 10 is connected with the clamping block 9, and the oil pipe can be fixed by screwing the bolt 10 to enable the inner surface walls on the two sides of the clamping block 9 to mutually extrude the oil pipe;
and the alarm is connected with the clamping block 9 and used for giving an alarm to remind people to check the oil pipe when the central control module judges that an alarm needs to be given.
The protection cylinder 4 in the embodiment of the invention can effectively prevent the heat absorbed by the radiating fins 7 from diffusing, and the alarm can remind people to check the oil pipe in time, so that the coal gangue falling from the top plate can be effectively prevented, and the hydraulic fittings and pipelines on the unit can be prevented from being broken or buried, the potential safety hazard is reduced, and the service life of a hydraulic system is prolonged.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.