CN107401419B - A kind of coal working face physical simulation bracket with setting load - Google Patents
A kind of coal working face physical simulation bracket with setting load Download PDFInfo
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- CN107401419B CN107401419B CN201710627991.XA CN201710627991A CN107401419B CN 107401419 B CN107401419 B CN 107401419B CN 201710627991 A CN201710627991 A CN 201710627991A CN 107401419 B CN107401419 B CN 107401419B
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- bracket
- upright post
- load
- backplate
- force
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
Abstract
The invention discloses a kind of coal working face physical simulation bracket with setting load, including support skeleton, bracket upright post, force-measuring sensing system and display table；Support skeleton includes pedestal, connecting rod, shielding plate and top backplate；Force-measuring sensing system is fixed on the pedestal in support skeleton；Load cell system is electrically connected by signal transmssion line with display table；Bracket upright post is length-adjustable telescopic column, and the lower end of bracket upright post and the upper face of force-measuring sensing system are fixed, and the lower surface of the top backplate of the upper end and support skeleton of bracket upright post is fixed.Physical simulation bracket provided by the invention with setting load can be improved test accuracy, the reliability that can be simulated realistically engineering site, realize result.
Description
Technical field
The invention belongs to physical simulation experimental rig field, in particular to a kind of coal working face with setting load
Physical simulation bracket.
Background technique
Hydraulic support is the capital equipment for ensureing stope (such as coal face) safety and upkeep operation space, and research bracket closes
The working resistance of reason and " bracket-country rock " relationship have great importance to the type selecting of hydraulic support.Physical simulation test
It is mining engineering research mine pressure and support load is effective and one of reliable means.Test uses and practical rock stratum physical force
The similar material of property is learned, by reasonably matching, according to the prototype actually exploited, it then follows certain scale smaller is made into test
Model.It the case where further according to practical exploitation, is excavated in a model, simulates the practical work such as propulsion or roadway excavation of working face
Journey, at the same in record cast digging process support load data, and corresponding observing and nursing formation damage and it is mobile situations such as.Afterwards
Phase analyzes test result, and the load that model support records is converted into the magnitude of load actually exploited according to formula, from
And achievees the purpose that simulation and actually exploit and realize Support selection.
Currently, model support used by physical simulation is tested does not have setting load, only pushing away with working face
Into when top plate occurs to destroy mobile, model support can just monitor the pressure on top plate, so the data of support load exist partially
Difference.In addition, when carrying out shifting frame, can not achieve the process of drop column, setting prop after excavation simulation one circulation, thus model support exists
Top top plate can be inevitably destroyed when mobile, influences the accuracy of load.The load data of test gained bracket is related to engineering reality
The type selecting of hydraulic support in border, this is related to production safety, and closely bound up with face investment is adopted.
In mining engineering, using physical simulation test carry out analog study when, also usually using model support come
The load of bracket during the record advance of the face.However, model support can not achieve the simulation to setting load, lead to load
It records not accurate enough；In addition, since column cannot drop in model support, being caused when mobile to top plate when carrying out shifting frame after excavation simulation
Damage, load data is affected when excavating again, further influences the precision of test.Therefore, load record is that physics is similar
Mostly important one of link, accurate load data have great importance to the success of test in simulation test.
To sum up, currently, the model support that physical simulation test uses mainly has the disadvantages that
(1) do not have setting load.Each step model working face excavation before, due to model support can not setting prop, thus
Without setting load, the active force very little between model support and top top plate, is not inconsistent with practical the case where exploiting at this time.
(2) easily top plate is formed when moving frame and is destroyed.When the model support in test moves frame at present, due to can not achieve drop column
It is operated with setting prop etc., bracket can only be forcibly moved to working face wall, this is applied with human interference to top plate, destroys top plate
Structural form influences it and is caving process, and there are deviations for legitimate reading.
(3) by (1), (2) analysis it is found that model support used at present there are drawbacks, thus give later stage arrange
Data and summary phenomenon bring difficulty.
Therefore, physical simulation test is not only required in similar to practical rock stratum on material, more will be in digging process power
Ask unified with practical the case where exploiting, thus model support used by test is to be improved.Upper analysis, model support carry accordingly
The record of lotus still has one of urgent problem to be solved in drawback and simulation test.
Summary of the invention
The purpose of the present invention is overcoming above-mentioned problems of the prior art, a kind of coal-getter with setting load is provided
Make face physical simulation bracket, to improve test accuracy, simulates realistically the reliability of engineering site, realization result.
The technical scheme is that a kind of coal working face physical simulation bracket with setting load, including branch
Frame skeleton, bracket upright post, force-measuring sensing system and display table；The support skeleton includes pedestal, connecting rod, shielding plate and top
Backplate, the pedestal are fixedly connected with the lower end of connecting rod, and the upper end of connecting rod is fixedly connected with shielding plate, shielding plate and top backplate it
Between be connected, and push up backplate can adjust its position down in vertical direction；The force-measuring sensing system is fixed in support skeleton
Susceptor surface, force-measuring sensing system includes upper face, lower face and the load cell being fixed between upper and lower plate face,
The load cell is electrically connected by signal transmssion line with display table；The bracket upright post is length-adjustable telescopic column,
The lower end of bracket upright post and the upper face of force-measuring sensing system are fixed, under the upper end of bracket upright post and the top backplate of support skeleton
Surface is fixed；The bracket upright post includes head, screw rod, nut and sleeve, and the lower end of screw rod, screw rod are fixed in the head
Upper threaded coupling nut is socketed the sleeve on the screw rod above nut, and nut forms upward support to sleeve；The head
Portion is welded on the upper face of force-measuring sensing system, and the upper end of the sleeve is welded in the lower surface of the top backplate of support skeleton；
The quantity of the bracket upright post is a.
The upper face is set to the upper surface of load cell, and Upper gasket is equipped between load cell；Under described
Plate face is set to the lower surface of load cell, and lower gasket is equipped between load cell.
The display table includes shell, and controller is equipped in shell, and shell is equipped with display screen；Load cell passes through letter
Number transmission line is electrically connected with the controller, and controller is electrically connected with display screen.
The shielding plate and the specific connection structure pushed up between backplate are: the two sides of the shielding plate upper end offer spiral shell
Hole, screw hole internal screw thread are connected with bolt, and the two sides of the top backplate are respectively equipped with the side guard plate perpendicular to top backplate plate face, side shield
Adjustment hole is offered on plate, the bolt is passed through adjustment hole and fastened with nut.
The chassis side of the support skeleton offers threading hole, and the signal transmssion line passes through the threading hole and display table
Electrical connection.
The force-measuring sensing system is sandwiched by two threaded rods being threadedly connected on support skeleton and is positioned at bracket
On intraskeletal pedestal.
For the shielding plate horizontal by angle shape, screening plate includes caving shield and the caving shield side on caving shield
Backplate, the connecting rod are mutually fixed with caving shield；The top backplate is parallel to the horizontal plane, top backplate include top beam and be set to top beam
On top beam backplate.
The connecting rod includes two groups of struts, and every group of strut includes two struts, and the pedestal two side ends are respectively with one
The lower end of two struts of group strut is fixed, and the upper end of two struts is mutually fixed with the caving shield.
The controller is the PLC controller or MSP430 single-chip microcontroller of model OMRON CP1E-N20DR-D.
Beneficial effects of the present invention: in the embodiment of the present invention, a kind of coal working face physics phase with setting load is provided
Like simulation bracket, the present invention includes following technological merit:
(1) bracket of the present invention has setting load, and the operating process for applying setting load is simple, can accurately reach model branch
The predetermined value of setting load needed for frame.
(2) when bracket of the present invention moves frame, the processes such as drop column, setting prop is can be realized, the damage to top plate is reduced, improve
The precision of test result.
(3) with practical exploitation situation more closely, test result is more credible.
(4) bracket working principle of the present invention is easy-to-understand, and operating process is simple and convenient, and each section component is relatively inexpensive and easy
In replacement.
To sum up, the physical simulation bracket provided by the invention with setting load, can be improved test accuracy, more really
Simulation engineering site, realize result reliability, have the characteristics that accurately, conveniently, component it is simple.
Detailed description of the invention
Fig. 1 is the overall structure diagram of bracket of the present invention；
Fig. 2 is load cell system schematic；
Fig. 3 is load cell top panel projecting end force diagram；
Fig. 4 is that display of the invention indicates to be intended to；
Fig. 5 is bracket upright post schematic diagram of the invention；
Fig. 6 is support skeleton of the invention；
Fig. 7 is the partial enlarged view for screening junction between plate and the side guard plate for pushing up backplate plate face.
Description of symbols: 1, support skeleton；2, bracket upright post；3, force-measuring sensing system；4, table is shown；5, threaded rod；
6, side guard plate；1-1, shielding plate；1-2, connecting rod；1-3, pedestal；1-4, top backplate；1-5, bolt；1-6, nut；1-7, adjusting
Hole；2-1, head；2-2, screw rod；2-3, nut；2-4, sleeve；3-1, load cell；3-2, top panel；3-3, Upper gasket；
3-4, signal transmssion line；3-5, lower panel；3-6, lower gasket.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the present invention is described in detail, it is to be understood that of the invention
Protection scope be not limited by the specific implementation.
Referring to Fig. 1, the embodiment of the invention provides a kind of coal working face physical simulation bracket with setting load,
Including support skeleton 1, bracket upright post 2, force-measuring sensing system 3 and display table 4；The support skeleton 1 includes pedestal 1-3, connects
Bar 1-2, shielding plate 1-1 and top backplate 1-4, the pedestal 1-3 are fixedly connected with the lower end of connecting rod 1-2, the upper end of connecting rod 1-2
It is fixedly connected, is connected between shielding plate 1-1 and top backplate 1-4, and pushing up backplate 1-4 can be in vertical direction with shielding plate 1-1
Lower its position of adjusting；Pedestal, connecting rod and shielding plate 1-1 connect into stable three-legged structure.The force-measuring sensing system 3 is fixed on
The surface pedestal 1-3 in support skeleton 1, force-measuring sensing system 3 include upper face 3-2, lower face 3-5 and are fixed on upper and lower
Load cell 3-1, the load cell 3-1 between plate face 3-2,3-5 are electrically connected by signal transmssion line with display table 4
It connects；The bracket upright post 2 is length-adjustable telescopic column, the lower end of bracket upright post 2 and the upper face 3- of force-measuring sensing system 3
2 is fixed, and the lower surface of the top backplate 1-4 of the upper end and support skeleton 1 of bracket upright post 2 is fixed.
The bracket upright post 2 includes head 2-1, screw rod 2-2, nut 2-3 and sleeve 2-4, and the head 2-1 is fixed on
The lower end of screw rod 2-2 is socketed the sleeve 2-4 on the screw rod 2-2 above threaded coupling nut 2-3 on screw rod 2-2, nut 2-3,
And nut 2-3 forms upward support to sleeve 2-4；The head 2-1 is welded on the upper face 3-2 of force-measuring sensing system 3,
The upper end of the sleeve 2-4 is welded in the lower surface of the top backplate 1-4 of support skeleton 1；The quantity of the bracket upright post 2 is 2.
The upper face 3-2 is set to the upper surface of load cell 3-1, and upper pad is equipped between load cell 3-1
Piece 3-3；The lower face 3-5 is set to the lower surface of load cell 3-1, and lower gasket is equipped between load cell 3-1
3-6。
The force-measuring sensing system is using resistance strain weighing transducer principle, and upper face is set as vacantly tying with lower face
Structure, its purpose is to the systems to generate elastic deformation under the effect of the pressure, send out the foil gauge of sensor elastomer therewith
Raw deformation, causes the variation of resistance, thus the electric signal of output and pressure linear proportional；Upper and lower plate face, gasket and sensor
Between be to be welded and fixed.
The display table 4 includes shell, and controller is equipped in shell, and shell is equipped with display screen；Load cell 3-1 is logical
It crosses signal transmssion line to be electrically connected with the controller, controller is electrically connected with display screen.
The shielding plate 1-1 and the specific connection structure pushed up between backplate 1-4 are: the two sides of the shielding upper end plate 1-1
Screw hole is offered, screw hole internal screw thread is connected with bolt 1-5, and the two sides of the top backplate 1-4 are respectively equipped with perpendicular to top backplate 1-4
The side guard plate 6 of plate face, offers adjustment hole 1-7 on side guard plate 6, and the bolt 1-5 passes through adjustment hole 1-7 and tight with nut 1-6
Gu.The adjustment hole 1-7 is extended in longitudinal direction, for adjusting the height of top backplate 1-4, specific structure in vertical direction
As shown in fig. 7, top backplate 1-4 can be freely lifted, be displaced in vertical direction is not influenced by shielding plate 1-1 connection type enlarged drawing.
The side pedestal 1-3 of the support skeleton 1 offers threading hole, and the signal transmssion line is by the threading hole and shows
Show that table 4 is electrically connected.
The force-measuring sensing system 3 is sandwiched by two threaded rods 5 being threadedly connected on support skeleton 1 and is positioned at branch
On pedestal 1-3 in frame skeleton 1.
For the shielding plate 1-1 horizontal by angle shape, screening plate 1-1 includes caving shield and covering on caving shield
Guard beam side guard plate, the connecting rod 1-2 are mutually fixed with caving shield；The top backplate 1-4 is parallel to the horizontal plane, and top backplate 1-4 includes
Top beam and the top beam backplate on top beam.
The connecting rod 1-2 includes two groups of struts, and every group of strut includes two struts, the pedestal 1-3 two side ends point
Lower end not with two struts of one group of strut is fixed, and the upper end of two struts is mutually fixed with the caving shield, two branch
It is not parallel between bar, and the distance between two strut upper ends are less than their the distance between lower end.
The controller is the PLC controller or MSP430 single-chip microcontroller of model OMRON CP1E-N20DR-D.
(1) the specific introduction of each component of the invention:
1) force-measuring sensing system
A, load cell system principle: in model working face digging process, top panel be will receive under the transmitting of top top plate
The pressure come, and the end A of sensor is passed to by Upper gasket, the foil gauge for being pasted onto sensor elastomer at this time generates therewith
Deformation, so as to cause the variation of resistance, the bridge circuit disequilibrium for forming resistance strain gage, output one and pressure are at line
The electric signal of property direct ratio, electric signal can be transmitted by transmission line 4.
B, form: load cell system is mainly made of load cell, upper and lower panel, upper lower gasket and transmission line.
C, it acts on: perception top roof pressure, and it is converted into electric signal output.
D, parameter: load cell system major parameter is shown in Table 1:
1 load cell system major parameter of table
E, the Stren gsth test of component:
Load cell system is easiest to that failure by shear (Fig. 2) occurs at a of top panel, if the load foot that top applies
It is enough big, more than top panel shearing strength when, then may occur failure by shear at a, thus will the intensity to component carry out school
It tests, to guarantee its reliability used.
Its stress is analyzed, as shown in Figure 3 as research object in the part to overhang using top panel.
Assuming that top panel is uniformly distributed loaded, considers the overload capacity 150% of sensor, take the situation of top roof pressure maximum
(the 150% of transducer range), to overhanging part, uniform load are as follows:
By equilibrium equation Σ Fy=0, it acquires:
Wherein, F is the range of sensor；FsFor the shearing at top panel a；ldFor the length of Upper gasket；lmFor top panel
Length；M is constraint couple.
By F=100N, lm=0.08m；ld=0.03m brings formula (2) into and can obtain:
Fs=93.75N
Section shearing stress are as follows:
Bringing data into can obtain:
In formula, τ is section shearing stress；A is shear surface area at a；[τ] is allowable shear stress.
It follows that load cell system meets intensity requirement, will not destroy.
2) table is shown
Such as Fig. 4, display table connects with the transmission line of load cell, the electric signal that sensor exports is shown, i.e.,
The pressure size that top top plate is transmitted, unit kg can be read on dial plate.
3) bracket upright post
Bracket upright post is as shown in Figure 5.
A, principle: by nut on screw rod, the diameter dimension of sleeve, which should meet, can be sleeved on the screw rod and be placed in spiral shell
On mother.When the downward precession of nut, sleeve declines therewith, simulates the drop column process of bracket at this time；When nut screws out upwards, sleeve
It rises with it, simulates the setting prop process of bracket at this time.Support setting load is achieved the purpose that by adjusting nut to realize.
B, form: model support column is mainly made of bolt (head, screw rod), nut and sleeve.
C, it acts on: transmitting the pressure of frame upper；It can be realized bracket drop column and setting prop process.
D, parameter: the major parameter of bracket upright post component is shown in Table 2:
The major parameter of 2 bracket upright post of table
E, the verification of component strength, stabilization and rigidity:
Since the top of sleeve is connect with set cap, the pressure of set cap transmitting is born, considers it for circular ring shape steel
Pipe is component the weakest in bracket upright post, thus is verified to indexs such as the intensity of sleeve.
It is circular ring shape steel pipe between sleeve, thus by the component strength of the Axial-compression Column in steel construction principle, stabilization
And the Method for Checking of rigidity is verified:
I, Stren gsth test: the support strength of sleeve is determined by following formula:
In formula, σ is the support strength of sleeve；N is support pressure；A1For sleeve area of section.
Due to sensor overload capacity be 150%, range 10kg, therefore:
N=150% × 10 × 10N=150N
Data are brought into formula (4), are obtained:
In formula, f is sleeve compression strength design value, takes f=215MPa.
Therefore the intensity of sleeve is met the requirements.
II, stablize verification:
If meeting formula (5), the monolithic stability of sleeve meets the requirements:
In formula,For the coefficient of stability.
It needs to determine at this timeWhen meeting formula (6),
Have:
In formula, λnFor dimensionless slenderness ratio；λ is the slenderness ratio of sleeve；fykFor the yield strength value of sleeve, f is takenyk=
235MPa；E is the elasticity modulus of sleeve, takes E=206GPa；α1For coefficient, α1=0.65.
λ is determined by formula (8), (9) and (10):
In formula, I be inertia away from；α=d/D；D is sleeve diameter, d=12mm；D is sleeve outer diameter D=15mm；μ is length
Factor, μ=0.7；L is the length of sleeve, l=20mm.
Bringing data into can acquire: λ=2.92, λn=0.031≤0.215.
Therefore:
At this point,
Therefore sleeve meets stability requirement.
III, rigidity verifies:
The rigidity of sleeve is verified with following formula:
λmax≤[λ] (11)
In formula, λmaxFor each axial maximum slenderness-ratio of sleeve, since sleeve is circular ring shape, λmax=λ=2.92；[λ] is to hold
Perhaps slenderness ratio, [λ]=150.
Formula (11) is obviously set up, therefore sleeve meets the requirement of rigidity.
To sum up, the design of bracket upright post is met the requirements.
4) support skeleton
Support skeleton is as shown in Figure 6.
A, principle: based on the hydraulic support used is actually exploited, in conjunction with the demand of test.Shielding plate is the shielding portion of bracket
Part prevents the spoil of inbreak from scurrying into model support；Connecting rod connects pedestal and superstructure；Pedestal supports whole model support；Top
Backplate carrying top rock stratum simultaneously prevents spoil from scurrying into.
B, it forms: being mainly made of components such as shielding plate, connecting rod, pedestal, top backplates.
C, act on: simulation actual bracket shape carries top strata structure, maintenance work space and accommodate sensor etc. its
His component.
D, the size of set cap are as follows: length × width x thickness=120mm × 80mm × 2mm.
E, it Stren gsth test: since the main body of simulation rack bearing is bracket upright post and load cell system, therefore is not required to pair
The intensity of support skeleton is verified.
(2) connection and cooperation of each component of model support
Such as Fig. 1, the connection of each component and cooperate as follows:
1) load cell system is interposed in the suitable position of bracket base, and is fixed by bolt 1；
2) head of two model support columns is weldingly fixed on the upper surface of load cell system plate, the upper end of sleeve
It is weldingly fixed on the downside of set cap；
3) transmission line of load cell system is stretched out by threading hole, and is connect with display table.
It is as shown in Figure 1 after the completion of model support combination.
(3) processing of the scope of application and test data of model support
1) scope of application
The scope of application of model support, mould are determined according to the range of load cell in the height of model support and bracket
The height dimension of each component is shown in Table 3 in quasi- bracket.
The height dimension of 3 model support of table
As seen from the above table, according to the height of model support, preliminary judgement has following two usable condition:
A, using the likelihood ratio of 1:50, mining height is simulated the 3.0-3.5m the case where；
B, using the likelihood ratio of 1:100, mining height is simulated the 6.0-7.0m the case where.
For both the above situation, analysis is separately verified in conjunction with the range of load cell:
A:
αf1=5.3 × 10-6
In formula, αl1For geometric similarity ratio；αf1For force ratio；n1For a model support supporting area and a practical branch
Frame supporting area ratio；SModelFor model support supporting area (i.e. top beam area)；SIt is practicalFor actual bracket supporting area；F1For mould
The maximum load of type bracket analog actual hydraulic pressure bracket.
B:
αf2=6.7 × 10-7
In formula, αl2For geometric similarity ratio；αf2For force ratio；n2For a model support supporting area and a practical branch
Frame supporting area ratio；F2For the maximum load of model support analog actual hydraulic pressure bracket.
According to mining Practice, mining height support load in 3.0-3.5m is respectively less than 10482kN, mining height branch in 6.0-7.0m
Frame load is respectively less than 20353kN.Thus, the hydraulic support when range ability of model support is all satisfied practical exploitation in the case of two kinds
Magnitude of load.Therefore the invention patent is suitable for above-mentioned two situations.
2) processing of experimental data
A, the likelihood ratio of 1:50 simulates mining height 3.0-3.5m
It will show that meter reading is converted into the support load that simulation is actually exploited by formula (12):
In formula, FaTo simulate the support load actually exploited；mIt readsFor the reading for showing table.
B, the likelihood ratio of 1:100 simulates mining height 6.0-7.0m
It will show that meter reading is converted into the support load that simulation is actually exploited by formula (13):
In formula, FbTo simulate the support load actually exploited.
(4) use of model support
1) after the working face open-off cut of physical simulation test, model support is put into simulation working face.
2) display table switch is opened, " zero setting " button is clicked, the nut of bracket upright post is screwed out upwards so that sleeve is able to
Lifting, and by set cap and top top plate contact, at this point, pressure reading occurs in display table, continue to screw out nut until aobvious
Until showing the size that the reading of table reaches the scheduled setting load of model support.
3) excavated surface, while support load data are recorded by display table.
4) after the completion of model excavation step, following advancing process is carried out:
A, drop column: the nut of downward precession bracket upright post declines sleeve, at this point, set cap declines therewith, model branch
Frame is separated with top plate；
B, model support is moved to new working face wall；
C, setting prop: repeating step 2) and 3) carries out the digging process of a new step.
5) after all being excavated to model, model support is gently taken out, and closes display table switch.
6) hydraulic support magnitude of load when converting engineering practical exploitation for load data by formula (12) or (13), it is whole
Reason data are simultaneously analyzed, and are finally drawn a conclusion.
In conclusion a kind of coal working face physical simulation bracket with setting load provided by the invention, including
Following technological merit:
(1) bracket of the present invention has setting load, and the operating process for applying setting load is simple, can accurately reach model branch
The predetermined value of setting load needed for frame.
(2) when bracket of the present invention moves frame, the processes such as drop column, setting prop is can be realized, the damage to top plate is reduced, improve
The precision of test result.
(3) with practical exploitation situation more closely, test result is more credible.
(4) bracket working principle of the present invention is easy-to-understand, and operating process is simple and convenient, and each section component is relatively inexpensive and easy
In replacement.
To sum up, the physical simulation bracket provided by the invention with setting load, can be improved test accuracy, more really
Simulation engineering site, realize result reliability, have the characteristics that accurately, conveniently, component it is simple.
Disclosed above is only several specific embodiments of the invention, and still, the embodiment of the present invention is not limited to this, is appointed
What what those skilled in the art can think variation should all fall into protection scope of the present invention.
Claims (5)
1. a kind of coal working face physical simulation bracket with setting load, which is characterized in that including support skeleton (1),
Bracket upright post (2), force-measuring sensing system (3) and display table (4)；
The support skeleton (1) includes pedestal (1-3), connecting rod (1-2), shielding plate (1-1) and top backplate (1-4), the bottom
Seat (1-3) is fixedly connected with the lower end of connecting rod (1-2), and the upper end of connecting rod (1-2) is fixedly connected with shielding plate (1-1), screens plate
It is connected between (1-1) and top backplate (1-4), and push up backplate (1-4) its position can be adjusted down in vertical direction；
The force-measuring sensing system (3) is fixed on surface pedestal (1-3) in support skeleton (1), and force-measuring sensing system (3) includes
Upper face (3-2), lower face (3-5) and the load cell (3-1) being fixed between upper and lower plate face (3-2,3-5), it is described
Load cell (3-1) is electrically connected by signal transmssion line with display table (4)；The force-measuring sensing system is to utilize resistance-strain type
Weighing sensor principle, upper face and lower face are set as hanging structure, and force-measuring sensing system generates elasticity under the effect of the pressure
Deformation, making the foil gauge of sensor elastomer, deformation occurs therewith, causes the variation of resistance, so that output and pressure are linear just
The electric signal of ratio；The upper face (3-2) is set to the upper surface of load cell (3-1), and between load cell (3-1)
Equipped with Upper gasket (3-3)；The lower face (3-5) be set to load cell (3-1) lower surface, and with load cell (3-
1) lower gasket (3-6) is equipped between；
The bracket upright post (2) is length-adjustable telescopic column, lower end and force-measuring sensing system (3) of bracket upright post (2)
Upper face (3-2) is fixed, and the lower surface of the top backplate (1-4) of the upper end and support skeleton (1) of bracket upright post (2) is fixed；It is described
Bracket upright post (2) includes head (2-1), screw rod (2-2), nut (2-3) and sleeve (2-4), and the head (2-1) is fixed on
The lower end of screw rod (2-2), threaded coupling nut (2-3) on screw rod (2-2) are socketed institute on the screw rod (2-2) above nut (2-3)
It states sleeve (2-4), and nut (2-3) forms upward support to sleeve (2-4)；The head (2-1) is welded in force-measuring sensing
On the upper face (3-2) of system (3), the upper end of the sleeve (2-4) is welded under the top backplate (1-4) of support skeleton (1)
Surface；The quantity of the bracket upright post (2) is 2；By nut on screw rod, when the downward precession of nut, sleeve is under
Drop simulates the drop column process of bracket at this time；When nut screws out upwards, sleeve is risen with it, and simulates the setting prop process of bracket at this time；
Support setting load is achieved the purpose that by adjusting nut to realize；
For the shielding plate (1-1) horizontal by angle shape, screening plate (1-1) includes caving shield and covering on caving shield
Guard beam side guard plate, the connecting rod (1-2) are mutually fixed with caving shield；The top backplate (1-4) is parallel to the horizontal plane, and pushes up backplate (1-
It 4) include top beam and the top beam backplate on top beam；Specific connection between shielding plate (1-1) and top backplate (1-4)
Structure is: the two sides of described shielding upper end plate (1-1) offer screw hole, and screw hole internal screw thread is connected with bolt (1-5), the top shield
The two sides of plate (1-4) are respectively equipped with the side guard plate (6) perpendicular to top backplate (1-4) plate face, and side guard plate offers adjustment hole on (6)
(1-7), the bolt (1-5) pass through adjustment hole (1-7) and with nut (1-6) fastenings；
The substructure height 2mm, load cell system altitude 20.7mm, bracket upright post height 35-45mm push up backplate height
2mm, simulation bracket total height are 59.7-69.7mm；The screw diameter 10mm；Length sleeve is 20mm, wall thickness 1.5mm, outside
Diameter 15mm, internal diameter 12mm；
The display table (4) includes shell, and controller is equipped in shell, and shell is equipped with display screen；Load cell (3-1) is logical
It crosses signal transmssion line to be electrically connected with the controller, controller is electrically connected with display screen.
2. a kind of coal working face physical simulation bracket with setting load as described in claim 1, which is characterized in that
Side pedestal (1-3) of the support skeleton (1) offers threading hole, and the signal transmssion line passes through the threading hole and display table
(4) it is electrically connected.
3. a kind of coal working face physical simulation bracket with setting load as described in claim 1, which is characterized in that
The force-measuring sensing system (3) is sandwiched by two threaded rods (5) being threadedly connected on support skeleton (1) and is positioned at bracket
On pedestal (1-3) in skeleton (1).
4. a kind of coal working face physical simulation bracket with setting load as described in claim 1, which is characterized in that
The connecting rod (1-2) includes two groups of struts, and every group of strut includes two struts, pedestal (1-3) two side ends respectively with
The lower end of two struts of one group of strut is fixed, and the upper end of two struts is mutually fixed with the caving shield.
5. a kind of coal working face physical simulation bracket with setting load as described in claim 1, which is characterized in that
The controller is the PLC controller or MSP430 single-chip microcontroller of model OMRON CP1E-N20DR-D.
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| CN201710627991.XA CN107401419B (en) | 2017-07-28 | 2017-07-28 | A kind of coal working face physical simulation bracket with setting load |
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| CN107401419B true CN107401419B (en) | 2019-09-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109339843B (en) * | 2018-09-05 | 2022-02-11 | 安徽理工大学 | Support running gear suitable for similar simulation coal petrography excavation |
| CN109707418B (en) * | 2019-03-08 | 2023-06-09 | 安徽理工大学 | Simulation support for measuring roof pressure by ore pressure simulation experiment |
| CN110566258A (en) * | 2019-08-22 | 2019-12-13 | 天地科技股份有限公司 | Support model for simulating fully mechanized caving mining of coal mine |
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| SU1469168A1 (en) * | 1986-11-10 | 1989-03-30 | Всесоюзный научно-исследовательский и проектно-конструкторский угольный институт "КузНИУИ" | Bed for investigating the interaction of power support with loose roof through canopy |
| CN102261972A (en) * | 2011-04-19 | 2011-11-30 | 中国矿业大学(北京) | Experimental platform for relation between mining fully-mechanized support and surrounding rocks |
| CN102866032A (en) * | 2012-09-27 | 2013-01-09 | 安徽理工大学 | Similar material simulation test system |
| CN104807666A (en) * | 2015-05-15 | 2015-07-29 | 安徽理工大学 | Experimental device based on coal face timbering and dynamic moving frame simulation |
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| SU1469168A1 (en) * | 1986-11-10 | 1989-03-30 | Всесоюзный научно-исследовательский и проектно-конструкторский угольный институт "КузНИУИ" | Bed for investigating the interaction of power support with loose roof through canopy |
| CN102261972A (en) * | 2011-04-19 | 2011-11-30 | 中国矿业大学(北京) | Experimental platform for relation between mining fully-mechanized support and surrounding rocks |
| CN102866032A (en) * | 2012-09-27 | 2013-01-09 | 安徽理工大学 | Similar material simulation test system |
| CN104807666A (en) * | 2015-05-15 | 2015-07-29 | 安徽理工大学 | Experimental device based on coal face timbering and dynamic moving frame simulation |
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