CN209483403U - A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system - Google Patents
A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system Download PDFInfo
- Publication number
- CN209483403U CN209483403U CN201822065743.3U CN201822065743U CN209483403U CN 209483403 U CN209483403 U CN 209483403U CN 201822065743 U CN201822065743 U CN 201822065743U CN 209483403 U CN209483403 U CN 209483403U
- Authority
- CN
- China
- Prior art keywords
- hydraulic
- port
- oil
- reversing valve
- hydraulic pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
本实用新型公开了一种三柱式液压支架，属于液压支架技术领域，包括底座，所述底座连接有支撑机构，支撑机构的顶部连接有顶梁，顶梁的前端铰接有伸缩梁，伸缩梁铰接有护帮板；所述顶梁的后端铰接有掩护梁，掩护梁的底部通过角度调节机构与底座后端连接；所述支撑机构包括三根支撑立柱，所述三根支撑立柱呈“前一后二”的等腰三角形布置。本实用新型不仅能解决传统四连杆液压支架的种种问题，还可以降低对顶板的伤害，升柱、支撑和降柱的调整过程简单快速精准，并且也不会挤占底座有限的空间，保证矿道的通畅性。
The utility model discloses a three-column hydraulic support, which belongs to the technical field of hydraulic supports, and comprises a base, the base is connected with a support mechanism, the top of the support mechanism is connected with a top beam, the front end of the top beam is hinged with a telescopic beam, and the telescopic beam A side guard is hinged; the rear end of the top beam is hinged with a cover beam, and the bottom of the cover beam is connected to the rear end of the base through an angle adjustment mechanism; the support mechanism includes three support columns, and the three support columns are in the shape of "the previous one". The last two" isosceles triangle arrangement. The utility model can not only solve various problems of the traditional four-link hydraulic support, but also reduce the damage to the roof. The patency of the road.
Description
Technical Field
The utility model relates to a hydraulic support technical field, in particular to three-column hydraulic support, stand hydraulic system and electric hydraulic control system thereof.
Background
China is a large coal resource country, comprehensive mechanical coal mining is a current trend method for coal mining, and a hydraulic support is important supporting equipment of a coal mining working face, so that the design and the use of the hydraulic support are reasonable, and the safety of workers and various operations is ensured. The hydraulic support has a history of more than 50 years in China, the hydraulic support used at present is improved and upgraded on the basis of a four-bar linkage mechanism, but the four-bar linkage mechanism is a plane hyperstatic mechanism and has a large self-internal force, meanwhile, the plane mechanism does not have the capability of resisting lateral component force and cannot bear lateral component force, the coal distribution range of China is wide, the coal bed conditions are complex and changeable, in practical application, due to the unevenness of a top plate and the change of the coal bed inclination angle, the pressure of the top plate on the hydraulic support inevitably has the lateral component force, and large additional load is generated, so that the major safety accidents of damage to a shield beam, falling over, sliding down and the like are caused.
In order to solve the above problems, chinese patent document discloses a patent technology entitled as three-degree-of-freedom parallel hydraulic support with CN103899343a, which uses a three-translational three-degree-of-freedom parallel mechanism as a main supporting mechanism of the hydraulic support, and can realize limited designated yielding movement and effective bearing of the hydraulic support relative to a top plate and a bottom plate, but the hydraulic support uses a parallel supporting mechanism and a back parallel supporting mechanism as the supporting mechanism of the hydraulic support, even though six hydraulic supports are used for controlling the hydraulic support to perform posture adjustment, the six hydraulic upright posts not only bring large pressure to the top plate, which results in the reduction of the service life of the top plate, the support adjustment process is complicated and slow, and cannot quickly and accurately adjust the lifting, supporting and lowering columns of the hydraulic support, but also can squeeze the space of the base which is not large, and affect the smoothness of the mine tunnel, the hydraulic support is not beneficial to the passing of workers or machinery, and therefore, the development of a hydraulic support which is high in efficiency, high in precision adjustment and free of influence on the smoothness of a mine tunnel is quite necessary in the coal mining industry at present.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a three-column hydraulic support; this three-column hydraulic support can not only solve various problems of traditional four-bar hydraulic support, can also reduce the injury to the roof, rises the post, supports and falls the simple quick accurate of adjustment process of post to also can not crowd and account for the limited space of base, guarantee the patency of ore deposit way.
In order to solve the technical problem, the utility model provides a three-column hydraulic support, which comprises a base, wherein the base is connected with a supporting mechanism, the top of the supporting mechanism is connected with a top beam, the front end of the top beam is hinged with a telescopic beam, and the telescopic beam is hinged with a side protection plate; the rear end of the top beam is hinged with a shield beam, and the bottom of the shield beam is connected with the rear end of the base through an angle adjusting mechanism; the supporting mechanism comprises three supporting stand columns, and the three supporting stand columns are arranged in an isosceles triangle shape of a front supporting stand column and a rear supporting stand column.
The utility model discloses an above-mentioned design, can not only solve all kinds of problems of traditional four-bar hydraulic support, can also reduce the injury to the roof, rise the post, support and fall the adjustment process of post simple quick accurate to also can not crowd and account for the limited space of base, guarantee the patency of ore deposit way.
The utility model discloses an in the further improvement, above-mentioned support post includes the articulated ear seat of being connected with the base, and articulated ear seat articulates there is double-acting hydraulic cylinder, and double-acting hydraulic cylinder's top is connected with the universal joint, and the universal joint is connected with the engaging lug seat, engaging lug seat and back timber fixed connection.
Through above-mentioned design, this patent can be better the performance bear the weight of the effect, and supporting mechanism is used for bearing the lateral load of the vertical direction of country rock effect between base and back timber and other directions.
When the hydraulic support works, the telescopic length of the double-acting hydraulic cylinder of the supporting mechanism is adjusted according to the actual requirement of a supporting working surface, and the three hydraulic cylinders are independently controlled to move, so that the top beam is lifted to prop against the surrounding rock at the top.
The utility model discloses a in the further improvement, above-mentioned two effect pneumatic cylinders adopt the flexible two effect pneumatic cylinders of two-stage.
Through the design, the patent can better reduce research and development expenditure and ensure the production as soon as possible.
The utility model discloses a in the further improvement, above-mentioned back timber is provided with flexible roof beam jack with flexible roof beam articulated department, flexible roof beam is provided with the hinge of group's board of protecting the jack of group's board.
Through the design, the effect is strutted in the better performance of this patent, during the use, can play the effect that keeps off the waste rock, prevent down the regulation frame and extend hydraulic support and strut working range.
The utility model discloses a in the further improvement, above-mentioned angle adjustment mechanism includes the connection ear seat of being connected with the shield roof beam bottom, and the connection ear seat is connected with the universal joint, and the universal joint is connected with the angle modulation jack, and the angle modulation jack is articulated to be connected the otic placode, connects otic placode and base rear end fixed connection.
Through above-mentioned design, this patent can be better top rear portion country rock, and hydraulic support during operation, supporting mechanism support withstands top country rock after, but the flexible length of jack is adjusted with angle regulation, makes to shield the roof beam and expandes backward, withstands rear portion country rock.
A three-column hydraulic support upright hydraulic system adopts a closed hydraulic system, and the closed hydraulic system comprises a first closed loop, a second closed loop, a third closed loop and a regulation and control loop; the regulating and controlling loop comprises a system pressure regulating and controlling loop and an oil supplementing pressure regulating and controlling loop;
the system pressure regulation circuit comprises a first return channel and a second return channel; the third closed loop is communicated with the first hydraulic pump of the first closed loop through a first return channel, and the second closed loop is communicated with the first hydraulic pump of the first closed loop through a second return channel;
the system pressure regulating and controlling loop is communicated with a first overflow valve through an oil outlet of a first hydraulic pump of a first closed loop, and the first overflow valve is communicated with an oil tank;
the oil supplementing pressure regulating and controlling loop is respectively communicated with the first closed loop, the second closed loop and the third closed loop through check valves.
Through the design, the posture adjustment can be carried out more quickly and stably in the hydraulic support, the closed hydraulic system is compact in structure, the loop pressure loss is small, the chance of contacting with air is less, the air is not easy to permeate into the system, the transmission is stable and quick, and the posture adjustment of the hydraulic support is more facilitated.
In the further improvement of the utility model, the first closed loop comprises a first hydraulic pump, a first reversing valve and a first hydraulic cylinder; an oil outlet of the first hydraulic pump is communicated with a port P of the first reversing valve, a port B of the first reversing valve is communicated with a rodless cavity of the first hydraulic cylinder through a hydraulic bidirectional lock, a rod cavity of the first hydraulic cylinder is communicated with a port A of the first reversing valve, and a port T of the first reversing valve is communicated with an oil inlet of the first hydraulic pump;
the second closed loop comprises a second hydraulic pump, a second reversing valve and a second hydraulic cylinder; an oil outlet of the second hydraulic pump is communicated with a port P of a second reversing valve, a port B of the second reversing valve is communicated with a rodless cavity of a second hydraulic cylinder through a hydraulic bidirectional lock, a rod cavity of the second hydraulic cylinder is communicated with a port A of the second reversing valve, and a port T of the second reversing valve is communicated with an oil inlet of the second hydraulic pump;
the third closed loop comprises a third hydraulic pump, a third reversing valve and a third hydraulic cylinder; an oil outlet of the third hydraulic pump is communicated with a port P of a third reversing valve, a port B of the third reversing valve is communicated with a rodless cavity of a third hydraulic cylinder through a hydraulic bidirectional lock, a rod cavity of the third hydraulic cylinder is communicated with a port A of the third reversing valve, and a port T of the third reversing valve is communicated with an oil inlet of the third hydraulic pump;
the first return channel comprises a first one-way valve, an oil inlet of the first one-way valve is communicated with a T port of the third reversing valve, and an oil outlet of the first one-way valve is communicated with an oil inlet of the first hydraulic pump; the first return passage allows excess hydraulic oil to return from the third hydraulic cylinder to the first hydraulic pump;
the second return channel comprises a second one-way valve, an oil inlet of the second one-way valve is communicated with a T port of the second reversing valve, and an oil outlet of the second one-way valve is communicated with an oil inlet of the first hydraulic pump; the second return passage allows excess hydraulic oil to return from the second hydraulic cylinder to the first hydraulic pump;
the oil supplementing pressure regulating and controlling loop comprises an auxiliary pump communicated with the oil tank, the auxiliary pump is communicated with a second overflow valve, and the second overflow valve is communicated with the oil tank; the auxiliary pump is respectively communicated with the oil outlet end of the first hydraulic pump, the oil outlet end of the second hydraulic pump and the oil outlet end of the third hydraulic pump through the one-way valve.
Through above-mentioned design, the posture adjustment that carries on that this patent can be better, moreover, what the first hydraulic pump of this patent, second hydraulic pump and third hydraulic pump adopted is the variable displacement pump, can be according to the required speed output of actuating mechanism system flow that corresponds, consequently, this hydraulic system is more efficient than traditional open hydraulic system.
In the system, the auxiliary pump provides external control pressure for variable pumps (a first hydraulic pump, a second hydraulic pump and a third hydraulic pump) and supplies oil for the whole closed system, the check valve plays a role in isolation during oil supply, the second overflow valve is used for adjusting the oil supply pressure, and the first overflow valve is used for adjusting the pressure of the closed system.
The utility model discloses a in the further improvement, the lift column: after a double-acting hydraulic cylinder closed hydraulic system is electrified, a first hydraulic pump, a second hydraulic pump and/or a third hydraulic pump are/is started, and a port A and a port T of a port B of a first reversing valve, a port A and a port T of a port B of a second reversing valve and/or a port A and a port T of a port B of a third reversing valve are/is started;
the hydraulic oil is pressurized by the first hydraulic pump and then is conveyed to the rodless cavity of the first hydraulic cylinder through the P port and the B port of the first reversing valve and the hydraulic bidirectional lock, the hydraulic oil in the rod cavity of the first hydraulic cylinder is conveyed to the oil inlet of the first hydraulic pump through the hydraulic bidirectional lock, the A port and the T port of the first reversing valve under pressure, and the piston rod of the first hydraulic cylinder rises;
and/or hydraulic oil is pressurized by a second hydraulic pump and then is conveyed to a rodless cavity of a second hydraulic cylinder through a port P and a port B of a second reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rod cavity of the second hydraulic cylinder is conveyed to an oil inlet of the second hydraulic pump through the hydraulic bidirectional lock, the port A and the port T of the second reversing valve under pressure, and a piston rod of the second hydraulic cylinder rises;
and/or hydraulic oil is pressurized by a third hydraulic pump and then is conveyed to a rodless cavity of a third hydraulic cylinder through a port P and a port B of a third reversing valve and a hydraulic bidirectional lock, the hydraulic oil in a rod cavity of the third hydraulic cylinder is conveyed to an oil inlet of the third hydraulic pump through the hydraulic bidirectional lock, the port A and the port T of the third reversing valve under pressure, and a piston rod of the third hydraulic cylinder rises;
supporting: the first hydraulic pump, the second hydraulic pump and/or the third hydraulic pump are/is closed, the port A and the port T of the port B of the first reversing valve, the port A and the port T of the port B of the second reversing valve and/or the port A and the port T of the port B of the third reversing valve are/is closed, and the piston rod of the first hydraulic cylinder, the piston rod of the second hydraulic cylinder and/or the piston rod of the third hydraulic cylinder stop rising;
descending the column: opening a first hydraulic pump, a second hydraulic pump and/or a third hydraulic pump, and opening a port A and a port T of a port B of a first reversing valve, a port A and a port T of a port B of a second reversing valve and/or a port A and a port T of a port B of a third reversing valve;
the hydraulic oil is pressurized by the first hydraulic pump and then is conveyed to the rod cavity of the first hydraulic cylinder through the P port and the A port of the first reversing valve and the hydraulic bidirectional lock, the hydraulic oil in the rodless cavity of the first hydraulic cylinder is conveyed to the oil inlet of the first hydraulic pump through the hydraulic bidirectional lock, the B port and the T port of the first reversing valve under pressure, and the piston rod of the first hydraulic cylinder descends;
and/or hydraulic oil is pressurized by a second hydraulic pump and then is conveyed to a rod cavity of a second hydraulic cylinder through a port P and a port A of a second reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rodless cavity of the second hydraulic cylinder is conveyed to an oil inlet of the second hydraulic pump through the hydraulic bidirectional lock, a port B and a port T of the second reversing valve under pressure, and a piston rod of the second hydraulic cylinder descends;
and/or hydraulic oil is pressurized by a third hydraulic pump and then is conveyed to a rod cavity of a third hydraulic cylinder through a port P and a port A of a third reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rodless cavity of the third hydraulic cylinder is conveyed to an oil inlet of the third hydraulic pump through the hydraulic bidirectional lock, the port B and a port T of the third reversing valve under pressure, and a piston rod of the third hydraulic cylinder descends;
pressure regulation: the excessive hydraulic oil of the third hydraulic cylinder returns to the first hydraulic pump through the first one-way valve of the first return channel; the excessive hydraulic oil of the second hydraulic cylinder returns to the first hydraulic pump through a second one-way valve of a second return passage; excess hydraulic oil is conveyed to an oil tank through a first hydraulic pump and a first overflow valve, and a closed hydraulic system of the double-acting hydraulic cylinder is decompressed;
oil supplement: the hydraulic oil of the oil tank is respectively fed to the oil outlet end of the first hydraulic pump, the oil outlet end of the second hydraulic pump and the oil outlet end of the third hydraulic pump through an oil feeding pressure regulating and controlling loop and a one-way valve;
oil supplement and pressure regulation: and hydraulic oil is output from the oil tank and returns to the oil tank through an auxiliary pump and a second overflow valve of the oil supplementing pressure regulating and controlling loop, and the oil supplementing pressure regulating and controlling loop releases pressure.
Through above-mentioned design, this patent can make better and roof country rock coupling of back timber, and the during operation, three stands can be controlled independently, and the workman can alternate three support post to different heights as required promptly for the back timber can with roof country rock further coupling.
A three-column type hydraulic support electrohydraulic control system comprises a hydraulic support, wherein a support controller is arranged on the hydraulic support, the support controller is connected with a control terminal, an information acquisition device and an electromagnetic driver, and the electromagnetic driver is connected with an electrohydraulic control valve group; the information acquisition device comprises pressure sensors, wherein the pressure sensors comprise upright post pressure sensors arranged inside the three upright posts of the hydraulic support and top beam pressure sensors arranged on the upper surface of the top beam of the hydraulic support corresponding to the positions of the three upright posts of the hydraulic support; the top beam pressure sensor comprises a top beam pressure sensor I, a top beam pressure sensor II and a top beam pressure sensor III, and the stand column pressure sensor comprises a stand column pressure sensor I, a stand column pressure sensor II and a stand column pressure sensor III.
Through the design, the gesture of the more accurate adjustment hydraulic support that this patent can be better, can know the pressure that hydraulic support back timber received pressure and stand provided at any time through back timber pressure sensor and stand sensor, and adjust the pump sending volume of hydraulic pump according to both, make the back timber can realize the coupling with the roof rock stratum better, protect the integrality of back timber to a certain extent, effectively improve hydraulic support's support performance, improve the reliability of strutting, security and stability.
In a further improvement of the present invention, the rack controller comprises a central control module, an information acquisition module, a transceiving control module and an electromagnetic driving module, wherein the information acquisition module, the transceiving control module and the electromagnetic driving module are connected with the central control module; wherein,
the information acquisition module is used for carrying out analog-to-digital conversion on the signals received from the pressure sensor and providing the signals to the central control module;
the receiving and transmitting control module is used for data transmission between the central control module and the control terminal;
the electromagnetic driving module is used for outputting the instruction of the central control module to the electromagnetic driver;
the central control module is used for controlling the analog-to-digital conversion of the information acquisition module, the data transmission of the transceiving control module and the instruction output to the electromagnetic driving module.
Through the design, the posture of the hydraulic support can be adjusted more accurately.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses can not only solve all kinds of problems of traditional four-bar hydraulic support, can be fine avoid shielding the emergence of major incident such as roof beam damage, fall the frame and glide, can also reduce the injury to the roof, rise the post, support and fall the adjustment process of post simple quick accurate to can not crowd the limited space of base yet, guarantee the patency of ore deposit way.
Compared with the traditional four-connecting-rod hydraulic support, the hydraulic support has the advantages that in the aspect of space stress, the hydraulic support has the compressive capacity in three directions in space, and comprises the lateral compressive capacity which is not possessed by the traditional hydraulic support, so that the top beam and the base of the hydraulic support have higher stability of a large inclination angle, the support performance of the hydraulic support is effectively improved, and major safety accidents such as damage to a shield beam, falling of the support, sliding and the like can be well avoided; meanwhile, compared with a CN103899343A three-degree-of-freedom double-parallel hydraulic support, the frequency of repeated support and damage of the support to the top plate can be obviously reduced, and the maintenance of the top plate is facilitated; simultaneously this patent structure is simpler for the hydraulic pressure operating system that it used is also simpler, more does benefit to the quick accurate action of support, rises the post promptly, supports and falls the simple quick accurate more that the adjustment process of post becomes, moreover can also leave more spacious passageway, guarantees the patency of ore deposit way.
Drawings
To more clearly illustrate the background art or the technical solution of the present invention, the drawings used in conjunction with the prior art or the detailed description are briefly described below; it should be apparent that the following drawings in conjunction with the detailed description are only for the convenience of understanding the embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partially enlarged schematic view of the present invention.
Fig. 3 is a schematic view of the force analysis of the present invention.
Fig. 4 is a schematic diagram of the column hydraulic system of the present invention.
Fig. 5 is a schematic diagram of the electro-hydraulic control system of the present invention.
Shown in the figure: 1-a base; 2-top beam; 3-a telescopic beam; 4-side protection plate; 5-covering the beam; 6-hinged ear mount; 7-double acting hydraulic cylinder; 8-universal joint; 9-connecting the ear seat; 10-a telescopic beam jack; 11-an angle adjustment jack; 12-connecting ear plates; 13-a push rod; 14-a first hydraulic pump; 15-a first direction valve; 16-a first hydraulic cylinder; 17-hydraulic bidirectional lock; 18-a second hydraulic pump; 19-a second reversing valve; 20-a second hydraulic cylinder; 21-a third hydraulic pump; 22-a third directional valve; 23-a third hydraulic cylinder; 24-a first overflow valve; 25-an oil tank; 26-an auxiliary pump; 261-an electric motor; 27-a second overflow valve; 28-a one-way valve; 100-a first return channel; 101-a first one-way valve; 200-a second return channel; 201-second one-way valve.
Detailed Description
In order to make the technical solution in the present invention better understand, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by the person skilled in the art without creative work should belong to the protection scope of the present invention.
As shown in fig. 1 and 2, a three-column hydraulic support comprises a base 1, wherein the base 1 is connected with a supporting mechanism, the top of the supporting mechanism is connected with a top beam 2, the front end of the top beam 2 is hinged with a telescopic beam 3, and the telescopic beam 3 is hinged with a side protection plate 4; the rear end of the top beam 2 is hinged with a shield beam 5, and the bottom of the shield beam 5 is connected with the rear end of the base through an angle adjusting mechanism; the supporting mechanism comprises three supporting stand columns, the three supporting stand columns are arranged in a shape of a front isosceles triangle and a rear isosceles triangle, and a push rod 13 is arranged in the middle of the front end of the base 1 and used for pushing the hydraulic support and a scraper conveyor which works with the hydraulic support in a matched mode.
In the supporting mechanism, three supporting upright posts and a top beam are respectively contacted with three points A, B, C, and the three points A, B, C form a triangle; because A, B, C has various position relations on the top beam, the stress analysis is carried out on three upright posts located at A, B, C to obtain A, B, C the best position relation on the top beam, as shown in fig. 3.
As shown in the following figure, the opening JKMN is a top beam, E is a vertical point from a point B to an edge MN, D is a vertical point from the point B to an edge JK, H is a vertical point from a point A to the edge MN, and I is a vertical point from the point B to the edge JK.
(1) When the three upright posts are distributed at the front position, the middle position and the rear position, A, C, B has the following distribution positions on the top beam:
(A) the X axis and the transverse central axis of the JKMN coincide, the point A is on the X axis, the two points B, C are respectively arranged on two sides of the X axis, and the distance from the point B to the X axis is equal to the distance from the point C to the X axis;
(B) the X axis is positioned on the upper side of the transverse central axis of the JKMN, the point A is positioned on the X axis, the two points B, C are respectively positioned on the two sides of the X axis, and the distance from the point B to the X axis is greater than the distance from the point C to the X axis;
(C) the X axis is positioned at the lower side of the transverse central axis of the JKMN, the point A is positioned on the X axis, the two points B, C are respectively positioned at the two sides of the X axis, and the distance from the point B to the X axis is smaller than that from the point C to the X axis;
by comparing the above solutions, (A) solution A has equal moments on both sides, so (A) solution is preferable.
(2) When three upright posts adopt an upright post at the front end and two upright posts at the rear end, A, C, B points have the following distribution positions on the top beam:
(A) the X axis and the transverse central axis of the JKMN are coincident, the point A is on the X axis, the point B, C are respectively arranged on two sides of the X axis, the distance from the point B to the X axis is equal to the distance from the point C to the X axis, and the triangle ABC is an isosceles triangle;
(B) the X axis and the transverse central axis of the JKMN coincide, the point A is on the X axis, the two points B, C are respectively arranged on two sides of the X axis, and the distance from the point C to the X axis is smaller than that from the point B to the X axis;
(C) the X axis is positioned at the lower side of the transverse central axis of the JKMN, the point A is positioned on the X axis, the two points B, C are respectively positioned at the two sides of the X axis, and the distance from the point C to the X axis is greater than that from the point B to the X axis;
by comparing the above schemes, (A) the moments on both sides of the point A are equal, and the moments on the two points B, C are equal, so the scheme (A) is preferred.
(3) When the three upright posts adopt two upright posts at the front end and one upright post at the rear end, A, C, B points have the following distribution positions on the top beam:
(A) the X axis and the transverse central axis of the JKMN coincide, the point A is on the X axis, the two points B, C are respectively arranged on two sides of the X axis, and the distance from the point C to the X axis is equal to the distance from the point B to the X axis;
(B) the X axis is positioned at the lower side of the transverse central axis of the JKMN, the point A is positioned on the X axis, the two points B, C are respectively positioned at the two sides of the X axis, and the distance from the point C to the X axis is greater than that from the point B to the X axis;
(C) the X axis and the transverse central axis of the JKMN are coincident, the point B is on the X axis, the two points A, C are respectively arranged on two sides of the X axis, the distance from the point A to the X axis is equal to the distance from the point C to the X axis, and the triangle ABC is an isosceles triangle;
comparing the two schemes (B) and (C), the scheme (C) is preferred because the moments at the points B are not equal.
By comparing the arrangement schemes of the three modes (1), (2) and (3), because the moments on two sides of the point B in the scheme (A) are not equal to cause uneven stress distribution of the top beam, (3) the point A in the scheme (C) is less stressed, and the moments on two sides of the point A in the scheme (A) are equal to each other and B, C points are equal to each other, the scheme (2) is preferably selected, namely three columns adopt one column at the front end and two columns at the rear end, and the triangle ABC is an isosceles triangle.
When the hydraulic lifting device is used, the telescopic lengths of the double-acting hydraulic cylinders of the three support columns of the support mechanism are adjusted according to the actual requirement of a supporting working surface to lift the top beam to prop against top surrounding rocks, the three hydraulic cylinders synchronously move, the front cylinder continues to move upwards after the platform moves upwards to a certain height, the two rear cylinders keep still, the front cylinder stops moving after reaching a specified position, the superposition of the top beam and the working surface of the surrounding rocks is ensured by adjusting the telescopic lengths of the two rear cylinders, and the three hydraulic cylinders independently control to move; when the three hydraulic cylinders are arranged in an isosceles triangle, the telescopic lengths of the two rear cylinders can be adjusted simultaneously, and the required time is short; when the three hydraulic cylinders are not arranged in an isosceles triangle, the telescopic lengths of the other two cylinders need to be adjusted respectively, and the required time is long; in summary, in the supporting mechanism, it is more advantageous that the three hydraulic cylinders are arranged in an isosceles triangle with a front part and a rear part.
The support post includes articulated ear seat 6 of being connected with base 1, and articulated ear seat 6 articulates there is two effect pneumatic cylinder 7, and the top of two effect pneumatic cylinder 7 is connected with universal joint 8, and universal joint 8 is connected with connection ear seat 9, connects ear seat 9 and back timber 2 fixed connection, two effect pneumatic cylinder 7 adopt the flexible two effect pneumatic cylinder of two-stage.
And a telescopic beam jack 10 is arranged at the hinged position of the top beam 2 and the telescopic beam 3, and a side protection plate jack is arranged at the hinged position of the telescopic beam 3 and the side protection plate 4.
The angle adjusting mechanism comprises a connecting lug seat 9 connected with the bottom of the shield beam 5, the connecting lug seat 9 is connected with a universal joint 8, the universal joint 8 is connected with an angle adjusting jack 11, the angle adjusting jack 11 is hinged with a connecting lug plate 12, and the connecting lug plate 12 is fixedly connected with the rear end of the base 1.
The shield beam 5 is located at the rear end of the top beam 2, and the shield beam 5 is mainly used for bearing the horizontal force of the hydraulic support and the pressure of caving roof rocks, preventing the falling gangue in the goaf from entering the lower part of the hydraulic support, ensuring the working safety of personnel and equipment below the hydraulic support, bearing the horizontal acting force from the top plate and the top beam, and improving the stability of the hydraulic support for controlling the top plate.
When the hydraulic support works, the telescopic length of the double-acting hydraulic cylinders of the supporting mechanism is adjusted according to the actual requirement of a supporting working surface, the three hydraulic cylinders independently control to move, so that the top beam is lifted to prop against surrounding rocks at the top, then the telescopic beam jack is adjusted to extend the telescopic beam, the working space of the hydraulic support is extended, and then the side protection plate jack is adjusted to respectively unfold the side protection plates; then adjusting the telescopic length of the angle adjusting jack to enable the shield beam to expand backwards and prop against surrounding rocks at the rear part; and finally, under the working state, the push rod of the base extends out, so that the function of pushing and sliding the scraper conveyor is realized.
When the hydraulic support needs to be moved, the telescopic lengths of the double-acting hydraulic cylinder, the telescopic beam jack and the angle adjusting jack are adjusted, so that the top beam is lowered, the telescopic beam is retracted, the shield beam is retracted, the side guard plate is retracted, and finally the push rod of the base is retracted, so that the support moving function is realized.
As mentioned above, the structure of the hydraulic support is simpler than that of a three-degree-of-freedom double-parallel hydraulic support, namely, a corresponding hydraulic operating system is simpler, and the quick action of the support is facilitated.
The three-column hydraulic support can be well coupled with a top plate rock stratum, integrity of a top beam is protected to a certain degree, limited appointed yielding movement and effective bearing of the hydraulic support relative to a top plate and a bottom plate can be achieved, lateral component forces from other directions can be borne except for vertical pressure exerted on the hydraulic support by the top plate and the bottom plate, supporting performance of the hydraulic support can be effectively improved, and reliability, safety and stability of supporting are improved.
As shown in fig. 4, the present patent provides a hydraulic system for a three-column hydraulic support column, where the hydraulic system for the column adopts a closed hydraulic system, and the closed hydraulic system includes a first closed circuit, a second closed circuit, a third closed circuit, and a regulation and control circuit; the regulating and controlling loop comprises a system pressure regulating and controlling loop and an oil supplementing pressure regulating and controlling loop; the system pressure regulation circuit includes a first return passage 100 and a second return passage 200; the third closed circuit is communicated with the first hydraulic pump of the first closed circuit through a first return passage 100, and the second closed circuit is communicated with the first hydraulic pump of the first closed circuit through a second return passage 200; the system pressure regulating and controlling loop is communicated with a first overflow valve through an oil outlet of a first hydraulic pump of a first closed loop, and the first overflow valve is communicated with an oil tank; the oil supplementing pressure regulating and controlling loop is respectively communicated with the first closed loop, the second closed loop and the third closed loop through check valves.
The first closed circuit comprises a first hydraulic pump 14, a first reversing valve 15 and a first hydraulic cylinder 16; an oil outlet of the first hydraulic pump 14 is communicated with a port P of a first reversing valve 15, a port B of the first reversing valve 15 is communicated with a rodless cavity of a first hydraulic cylinder 16 through a hydraulic bidirectional lock 17, a rod cavity of the first hydraulic cylinder 16 is communicated with a port A of the first reversing valve 15, and a port T of the first reversing valve 15 is communicated with an oil inlet of the first hydraulic pump 14;
the second closed loop comprises a second hydraulic pump 18, a second reversing valve 19 and a second hydraulic cylinder 20; an oil outlet of the second hydraulic pump 18 is communicated with a port P of a second reversing valve 19, a port B of the second reversing valve 19 is communicated with a rodless cavity of a second hydraulic cylinder 20 through a hydraulic bidirectional lock 17, a rod cavity of the second hydraulic cylinder 20 is communicated with a port A of the second reversing valve 19, and a port T of the second reversing valve 19 is communicated with an oil inlet of the second hydraulic pump 18;
the third closed circuit comprises a third hydraulic pump 21, a third directional control valve 22 and a third hydraulic cylinder 23; an oil outlet of the third hydraulic pump 21 is communicated with a port P of a third reversing valve 22, a port B of the third reversing valve 22 is communicated with a rodless cavity of a third hydraulic cylinder 23 through a hydraulic bidirectional lock 17, a rod cavity of the third hydraulic cylinder 23 is communicated with a port A of the third reversing valve 22, and a port T of the third reversing valve 22 is communicated with an oil inlet of the third hydraulic pump 21;
the first return channel 100 comprises a first one-way valve 101, an oil inlet of the first one-way valve 101 is communicated with a T port of the third reversing valve 22, and an oil outlet of the first one-way valve 101 is communicated with an oil inlet of the first hydraulic pump 14; the first return passage 100 allows excess hydraulic oil to return from the third hydraulic cylinder 23 to the first hydraulic pump 14;
the second return channel 200 comprises a second one-way valve 201, an oil inlet of the second one-way valve 201 is communicated with a T port of the second reversing valve 19, and an oil outlet of the second one-way valve 201 is communicated with an oil inlet of the first hydraulic pump 14; the second return passage 200 allows excess hydraulic oil to return from the second hydraulic cylinder 20 to the first hydraulic pump 14;
the oil supplementing pressure regulating and controlling loop comprises an auxiliary pump 26 communicated with the oil tank 25, the auxiliary pump 26 is communicated with a second overflow valve 27, and the second overflow valve 27 is communicated with the oil tank 25; the auxiliary pump 26 is communicated with the oil outlet side of the first hydraulic pump 14, the oil outlet side of the second hydraulic pump 18 and the oil outlet side of the third hydraulic pump 21 through check valves 28, respectively.
Lifting the column: after a double-acting hydraulic cylinder closed hydraulic system is electrified, a first hydraulic pump, a second hydraulic pump and/or a third hydraulic pump are/is started, and a port A and a port T of a port B of a first reversing valve, a port A and a port T of a port B of a second reversing valve and/or a port A and a port T of a port B of a third reversing valve are/is started;
the hydraulic oil is pressurized by the first hydraulic pump and then is conveyed to the rodless cavity of the first hydraulic cylinder through the P port and the B port of the first reversing valve and the hydraulic bidirectional lock, the hydraulic oil in the rod cavity of the first hydraulic cylinder is conveyed to the oil inlet of the first hydraulic pump through the hydraulic bidirectional lock, the A port and the T port of the first reversing valve under pressure, and the piston rod of the first hydraulic cylinder rises;
and/or hydraulic oil is pressurized by a second hydraulic pump and then is conveyed to a rodless cavity of a second hydraulic cylinder through a port P and a port B of a second reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rod cavity of the second hydraulic cylinder is conveyed to an oil inlet of the second hydraulic pump through the hydraulic bidirectional lock, the port A and the port T of the second reversing valve under pressure, and a piston rod of the second hydraulic cylinder rises;
and/or hydraulic oil is pressurized by a third hydraulic pump and then is conveyed to a rodless cavity of a third hydraulic cylinder through a port P and a port B of a third reversing valve and a hydraulic bidirectional lock, the hydraulic oil in a rod cavity of the third hydraulic cylinder is conveyed to an oil inlet of the third hydraulic pump through the hydraulic bidirectional lock, the port A and the port T of the third reversing valve under pressure, and a piston rod of the third hydraulic cylinder rises;
supporting: the first hydraulic pump, the second hydraulic pump and/or the third hydraulic pump are/is closed, the port A and the port T of the port B of the first reversing valve, the port A and the port T of the port B of the second reversing valve and/or the port A and the port T of the port B of the third reversing valve are/is closed, and the piston rod of the first hydraulic cylinder, the piston rod of the second hydraulic cylinder and/or the piston rod of the third hydraulic cylinder stop rising;
descending the column: opening a first hydraulic pump, a second hydraulic pump and/or a third hydraulic pump, and opening a port A and a port T of a port B of a first reversing valve, a port A and a port T of a port B of a second reversing valve and/or a port A and a port T of a port B of a third reversing valve;
the hydraulic oil is pressurized by the first hydraulic pump and then is conveyed to the rod cavity of the first hydraulic cylinder through the P port and the A port of the first reversing valve and the hydraulic bidirectional lock, the hydraulic oil in the rodless cavity of the first hydraulic cylinder is conveyed to the oil inlet of the first hydraulic pump through the hydraulic bidirectional lock, the B port and the T port of the first reversing valve under pressure, and the piston rod of the first hydraulic cylinder descends;
and/or hydraulic oil is pressurized by a second hydraulic pump and then is conveyed to a rod cavity of a second hydraulic cylinder through a port P and a port A of a second reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rodless cavity of the second hydraulic cylinder is conveyed to an oil inlet of the second hydraulic pump through the hydraulic bidirectional lock, a port B and a port T of the second reversing valve under pressure, and a piston rod of the second hydraulic cylinder descends;
and/or hydraulic oil is pressurized by a third hydraulic pump and then is conveyed to a rod cavity of a third hydraulic cylinder through a port P and a port A of a third reversing valve and a hydraulic bidirectional lock, hydraulic oil in a rodless cavity of the third hydraulic cylinder is conveyed to an oil inlet of the third hydraulic pump through the hydraulic bidirectional lock, the port B and a port T of the third reversing valve under pressure, and a piston rod of the third hydraulic cylinder descends;
pressure regulation: the excessive hydraulic oil of the third hydraulic cylinder returns to the first hydraulic pump through the first one-way valve of the first return channel; the excessive hydraulic oil of the second hydraulic cylinder returns to the first hydraulic pump through a second one-way valve of a second return passage; excess hydraulic oil is conveyed to an oil tank through a first hydraulic pump and a first overflow valve, and a closed hydraulic system of the double-acting hydraulic cylinder is decompressed;
oil supplement: the hydraulic oil of the oil tank is respectively fed to the oil outlet end of the first hydraulic pump, the oil outlet end of the second hydraulic pump and the oil outlet end of the third hydraulic pump through an oil feeding pressure regulating and controlling loop and a one-way valve;
oil supplement and pressure regulation: and hydraulic oil is output from the oil tank and returns to the oil tank through an auxiliary pump and a second overflow valve of the oil supplementing pressure regulating and controlling loop, and the oil supplementing pressure regulating and controlling loop releases pressure.
In the technical scheme, the first reversing valve controls the movement of the first hydraulic cylinder, the second reversing valve controls the movement of the second hydraulic cylinder, the third reversing valve controls the movement of the third hydraulic cylinder, and the three hydraulic cylinders all move independently.
And the first reversing valve, the second reversing valve and the third reversing valve are all electromagnetic three-position four-way reversing valves, the loss of hydraulic oil in the system mainly comprises internal leakage of the hydraulic pump and the hydraulic cylinder and overflow from the first overflow valve and the second overflow valve, all system oil leakage returns to the oil tank, and then is supplemented to a closed system by an auxiliary pump, so that the oil quantity of the closed system is ensured.
An auxiliary pump may provide externally controlled pressure to the hydraulic pump via an electric motor 261, the auxiliary pump communicating with the tank and the second overflow valve and being connected to the overall system circuit via a check valve.
At present four connecting rod hydraulic support, perhaps CN103899343A three degree of freedom double-parallel hydraulic support adopts all open hydraulic system, the oscillation very easily appears during the support adjustment, influence hydraulic support's lift post, support and fall the post, and this patent is through foretell closed hydraulic system, not only variable pump (first hydraulic pump, second hydraulic pump and third hydraulic pump) can be according to the required speed output system flow that corresponds of actuating mechanism, it still has closed hydraulic system compact structure itself, the chance with air contact is less, the difficult infiltration system of air, the advantage fast that the transmission is steady, more do benefit to hydraulic support's posture adjustment, consequently, this hydraulic system is higher than traditional open hydraulic system efficiency.
Wherein the pressurized hydraulic oil is discharged with hydraulic pumps (a first hydraulic pump, a second hydraulic pump, and a third hydraulic pump); the pressurized hydraulic oil is led to the first hydraulic cylinder through the first closed loop, the flow direction of the hydraulic oil passing through the first hydraulic cylinder is selectively switched through the first reversing valve, and then the first hydraulic cylinder is made to ascend or descend; the pressurized hydraulic oil is led to the second hydraulic cylinder through the second closed loop, the flow direction of the hydraulic oil passing through the second hydraulic cylinder is selectively switched through the second reversing valve, and then the second hydraulic cylinder is made to ascend or descend; and the pressurized hydraulic oil is led to the third hydraulic cylinder through the third closed loop, and the flow direction of the hydraulic oil passing through the third hydraulic cylinder is selectively switched through the third reversing valve, so that the third hydraulic cylinder is lifted or lowered.
The utility model discloses a hydraulic support uses closed hydraulic system to carry out attitude adjustment, makes hydraulic support's accommodation process complex operation degree further reduce, and quicker, accurate realization hydraulic support is at the lift column, support and fall the post.
As shown in fig. 5, the present patent provides a three-column hydraulic support electrohydraulic control system, which includes a hydraulic support, a support controller is disposed on the hydraulic support, the support controller is connected to a control terminal, an information acquisition device and an electromagnetic driver, the electromagnetic driver is connected to an electrohydraulic control valve set, and the control terminal is an underground host, a ground host and/or a human-computer interface box in the prior art; the information acquisition device comprises pressure sensors, wherein the pressure sensors comprise upright post pressure sensors arranged inside the three upright posts of the hydraulic support and top beam pressure sensors arranged on the upper surface of the top beam of the hydraulic support corresponding to the positions of the three upright posts of the hydraulic support; the top beam pressure sensor comprises a top beam pressure sensor I, a top beam pressure sensor II and a top beam pressure sensor III, and the stand column pressure sensor comprises a stand column pressure sensor I, a stand column pressure sensor II and a stand column pressure sensor III.
The bracket controller comprises a central control module, an information acquisition module, a transceiving control module and an electromagnetic driving module which are connected with the central control module; the information acquisition module is used for carrying out analog-to-digital conversion on signals received from the pressure sensor and providing the signals to the central control module; the receiving and transmitting control module is used for data transmission between the central control module and the control terminal; the electromagnetic driving module is used for outputting the instruction of the central control module to the electromagnetic driver; the central control module is used for controlling the analog-to-digital conversion of the information acquisition module, the data transmission of the transceiving control module and the instruction output to the electromagnetic driving module.
At present, the design of pressure monitoring is not yet carried out on the top beam, only hydraulic prop, so often lead to the unmatched problem of pressure that the pillar provided and top beam received, make the top beam can not obtain effective holding power, and then make the top beam can not with the more agreeable coupling of roof country rock, so this patent has added top beam pressure monitoring design on the basis of current electrohydraulic control system, make the workman can know the pressure that the top beam received (as before, top beam pressure sensor sets up the hydraulic support top beam upper surface corresponding with three stand positions of hydraulic support, the measuring also is the power of three points of top beam "preceding one back two", so that the height of actually controlling three support posts in real time is for the effectual support with the top beam, even further, three stand of this patent can be independently controlled, namely the workman can change three support posts to different heights according to the three pressure of top beam pressure sensor transmission, so that the top beam can be further coupled with the roof surrounding rock.
The design concept of this patent: 1. the structure of the prior four-bar hydraulic support and the three-degree-of-freedom hydraulic support is changed, so that the defects of the prior four-bar hydraulic support can be overcome, the coupling with a top plate rock stratum is well realized, the integrity of a top beam is protected to a certain extent, meanwhile, the limited appointed yielding movement and effective bearing of the hydraulic support relative to a top plate and a bottom plate are realized, the hydraulic support can bear lateral component forces from other directions besides the vertical pressure exerted on the hydraulic support by the top plate and the bottom plate, the support performance of the hydraulic support is effectively improved, the support reliability, the support safety and the support stability are improved, the complex structure and the difficulty in realization of the three-degree-of-freedom hydraulic support can be avoided, and the high pressure is brought to the top plate, so that the service life of the top plate is reduced, the support adjustment process is complicated and slow, the hydraulic support lifting columns, the support, the smoothness of the mine path is influenced, the problems of being not beneficial to workers or machinery to pass through and the like are solved, and the development of the current coal mining industry is facilitated;
2. the current situation that an open hydraulic system is commonly used in the conventional hydraulic support is changed, the problems that the open hydraulic system is complex in structure and easy to oscillate during operation are solved, and the hydraulic support can be quickly and accurately adjusted in the process of lifting, supporting and lowering the column;
3. increase back timber pressure monitoring's design in current electric liquid control system, set up back timber pressure sensor on the back timber for hydraulic prop carries out scientific and reasonable's attitude adjustment more, makes the back timber laminate more with the coupling of roof surrounding rock, makes the back timber obtain more effective support.
It introduces to have carried out the detailed description above the technical scheme of the embodiment of the utility model discloses, this part adopts concrete embodiment to be right the utility model discloses a principle and implementation mode have been elucidated, and the description of above embodiment is only used for helping to understand the utility model discloses a core thought, under the condition that does not deviate from the utility model discloses a technical staff in the field is not making all other embodiments that obtain under the creative work prerequisite, all should belong to the scope of the protection of the utility model.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822065743.3U CN209483403U (en) | 2018-12-10 | 2018-12-10 | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822065743.3U CN209483403U (en) | 2018-12-10 | 2018-12-10 | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209483403U true CN209483403U (en) | 2019-10-11 |
Family
ID=68118249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822065743.3U Expired - Fee Related CN209483403U (en) | 2018-12-10 | 2018-12-10 | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209483403U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707428A (en) * | 2018-12-10 | 2019-05-03 | 山东华丰机电设备有限公司 | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system |
| CN116536996A (en) * | 2023-03-28 | 2023-08-04 | 武汉船用机械有限责任公司 | Flexible supporting device, using method and transport mechanism of heavy-load mine car |
-
2018
- 2018-12-10 CN CN201822065743.3U patent/CN209483403U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707428A (en) * | 2018-12-10 | 2019-05-03 | 山东华丰机电设备有限公司 | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system |
| CN109707428B (en) * | 2018-12-10 | 2024-05-31 | 山东华丰机电设备有限公司 | A three-column hydraulic support, column hydraulic system and electro-hydraulic control system thereof |
| CN116536996A (en) * | 2023-03-28 | 2023-08-04 | 武汉船用机械有限责任公司 | Flexible supporting device, using method and transport mechanism of heavy-load mine car |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109707428A (en) | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system | |
| CN2420422Y (en) | Automatic controlled top coal working rack | |
| CN106150382B (en) | It bores anchor and visits Multi Role Aircraft | |
| CN101182780A (en) | Coal mine down-hole splited articulated look ahead supporting support | |
| CN209483403U (en) | A kind of three pillar type hydraulic support, column hydraulic system and its electrohydraulic control system | |
| CN106704313B (en) | Rotary drilling rig and mast hydraulic control system and mast raising/decline control method | |
| CN109931083B (en) | Three-telescopic stand column with two-stage supporting function | |
| CN109339702A (en) | A digital multifunctional vehicle-mounted drilling and repairing machine | |
| CN201137500Y (en) | Coal mine down-hole split articulation type advanced support bracket | |
| CN103452585A (en) | Monorail crane with anchor protection mechanism | |
| CN201982127U (en) | Multistage plug-in connecting rod type filling hydraulic support | |
| CN102251790A (en) | Mining and filling integrated hydraulic support enabling double top beams to be coaxially hinged with four connecting rods | |
| CN105366604A (en) | Working bucket leveling mechanism of hydraulic aerial cage | |
| CN109610537A (en) | A construction vehicle bucket leveling mechanism | |
| CN205025484U (en) | Electrohydraulic control waste filling mines hydraulic support | |
| CN201190575Y (en) | Covering and connecting rod hydraulic support in fully mechanized mining face in thin coal seam | |
| US4613256A (en) | Supporting frame | |
| CN202181910U (en) | Mining and filling integrated hydraulic support frame with double top beam and four-connecting rod coaxially-hinged | |
| CN205170326U (en) | Working bucket leveling mechanism for aerial platform truck | |
| CN204283455U (en) | Novel thin coal seam filling hydraulic support | |
| CN209742887U (en) | Crushing device and arch center mounting crushing arm | |
| CN1052526C (en) | Light low-level hydraulic prop for caving coal-mining method | |
| CN216888546U (en) | Scraper tail adjustable cushion frame with supporting function | |
| CN103147779A (en) | Overall top beam statically indeterminate hydraulic bracket | |
| CN113277446B (en) | Automatic leveling system for battery platform of mining ground rail transportation equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191011 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |