CN109387126A - It is a kind of not couple cumulative escapement and its using the structure in non-coal mine blasthole - Google Patents
It is a kind of not couple cumulative escapement and its using the structure in non-coal mine blasthole Download PDFInfo
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- CN109387126A CN109387126A CN201811551051.8A CN201811551051A CN109387126A CN 109387126 A CN109387126 A CN 109387126A CN 201811551051 A CN201811551051 A CN 201811551051A CN 109387126 A CN109387126 A CN 109387126A
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- rubber band
- hangnail
- buckle
- cumulative
- escapement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- Geophysics And Detection Of Objects (AREA)
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Abstract
Cumulative escapement is not coupled the present invention relates to one kind and its using the structure in non-coal mine blasthole, cumulative escapement is not coupled wherein to include tray body and be located at tray body periphery for blocking the upper hangnail and lower hangnail of hole wall, the tray body includes back taper disk body and is located on back taper disk body upper surface tool internal thread internal threaded column, the inner wall of the internal threaded column is equipped with a suspension rubber band buckle, it is located at the rubber band hole being equipped with below internal threaded column for wearing rubber band on back taper disk body, the lower hangnail upper surface is equipped with the buckle to internal beam rubber band, internal beam rubber band is equipped on the buckle on each lower hangnail surface, the internal beam end of the internal beam rubber band passes through rubber band hole and is connected on suspension rubber band buckle, the primacord hole for wearing primacord is additionally provided on the tray body.The present invention is installed by the pallet between blocking and powder charge, prevents the generation of chongtian mortar, reduces slungshot, improves burst safety factor.
Description
Technical field:
Cumulative escapement is not coupled the present invention provides one kind and its using the structure in non-coal mine blasthole, belongs to non-coal
The construction fields such as the outdoor, underground explosion in mine.
Background technique:
Spaced loading is under the premise of guaranteeing that ore-rock is sufficiently broken, and using bottom hole underground borehole blasting, explosive is divided into independence
Several sections of powder columns, every section of powder column is designed with independent detonation and detonation train, has finally been connected into all detonating cords by ground
Quick-fried network.When detonation, the Explosive stress wave that same several sections of powder columns of blasthole explosive charge moment generate is overlapped mutually, and detonation gas produces
Object interaction influences each other, and finally can effectively improve the accumulation shape of demolition effect and rock slag, for reducing explosion shake
Dynamic peak particle vibration velocity, reduction boulder yield and reduction foundation has extremely important meaning.
The interval substance mainly used at present is mainly air, and demolition site applies more air-spacer, is to utilize
Polyethylene plastic bag is inflated by compressed gas, achievees the purpose that airspace.Such air-spacer not only production cost
It is higher, and have higher requirement to the safety of the steel cylinder of the compressed gas of storage.This air-spacer is to blasthole simultaneously
Inside the control ability of the degree of coupling is not lower, cannot reach the best demolition effect of Uncoincided charge.
Summary of the invention:
In place of against the above deficiency, provides one kind and do not couple cumulative escapement and its use in non-coal
Structure in the blasthole of mine.
The present invention does not couple cumulative escapement, it is characterised in that: including tray body and is located at tray body periphery for blocking
The firmly upper hangnail of hole wall and lower hangnail, the tray body include back taper disk body and are located on back taper disk body upper surface with interior
The internal threaded column of screw thread, the inner wall of the internal threaded column are equipped with a suspension rubber band buckle, internal screw thread are located on back taper disk body
The rubber band hole for wearing rubber band is equipped with below column, the lower hangnail upper surface is equipped with the buckle to internal beam rubber band, each
Internal beam rubber band is equipped on the buckle on lower hangnail surface, the internal beam end of the internal beam rubber band passes through rubber band hole and is connected to suspension rubber band
On buckle, the primacord hole for wearing primacord is additionally provided on the tray body.
Further, above-mentioned suspension rubber band buckle connects the shape that turns formed by two vertical scale coppers, and oral area is upward.
Further, external thread rod is bolted on above-mentioned internal threaded column, the external thread rod surface is provided with from bottom to top
Scale, the scale, using 5cm as unit scale, are successively marked along shaft axially upwards using external thread rod bottom as zero graduation line
It carves.
Further, above-mentioned upper hangnail is connected to form sharp cone distal with lower hangnail by two rectangular copper thin slices, two long
One short side of rectangular copper foil is fixed together, and opposite short side is separately fixed on tray body periphery, it is described buckle by
Two vertical copper sheets connect the shape that turns to be formed, and oral area is outwardly.
Further, above-mentioned upper hangnail is staggered 15 ° with lower hangnail circumferencial direction and is arranged.
Further, above-mentioned internal beam rubber band is threaded through on the buckle on each lower hangnail surface and forms circle, so that each lower hangnail
Interior receipts generate pretension, and the internal beam end of internal beam rubber band is placed on suspension rubber band buckle by drawing.
The present invention uses and does not couple structure of the cumulative escapement in non-coal mine blasthole, it is characterised in that: is included in
The blasthole being drilled in non-coal mine is equipped at intervals with several from bottom hole to aperture in the blasthole and does not couple cumulative escapement,
The cumulative escapement that do not couple includes tray body and is located at tray body periphery for blocking the upper hangnail and lower hangnail of hole wall,
The tray body includes back taper disk body and is located on back taper disk body upper surface tool internal thread internal threaded column, the interior spiral shell
The inner wall of line column is equipped with a suspension rubber band buckle, is located at below internal threaded column on back taper disk body and is equipped with for wearing rubber band
Rubber band hole, the lower hangnail upper surface are equipped with the buckle to internal beam rubber band, are equipped on the buckle on each lower hangnail surface
Internal beam rubber band, the internal beam end of the internal beam rubber band pass through rubber band hole and are connected on suspension rubber band buckle, also set on the tray body
There is the primacord hole for wearing primacord;Fill part powder type explosive between cumulative escapement is not coupled adjacent in blasthole
Or bag powder and reserve airspace.
Further, above-mentioned suspension rubber band buckle connects the shape that turns formed by two vertical scale coppers, and oral area is upward;In described
External thread rod is bolted in threaded post, the external thread rod surface is provided with scale from bottom to top, and the scale is with external thread rod
Bottom is zero graduation line, using 5cm as unit scale, successively along shaft marking axially upwards.
Further, above-mentioned upper hangnail is connected to form sharp cone distal with lower hangnail by two rectangular copper thin slices, two long
One short side of rectangular copper foil is fixed together, and opposite short side is separately fixed on tray body periphery, it is described buckle by
Two vertical copper sheets connect the shape that turns to be formed, and oral area is outwardly.
Further, above-mentioned upper hangnail is staggered 15 ° with lower hangnail circumferencial direction and is arranged;The internal beam rubber band be threaded through it is each under
Circle is formed on the buckle on hangnail surface, generates pretension so as to receive in each lower hangnail, the internal beam end of internal beam rubber band is hung by drawing
It is placed on suspension rubber band buckle.
The present invention does not couple the tray body of cumulative escapement in inverted cone shape, is on the one hand support so as to form sockets for collecting energy
After explosive initiation below disk body, during detonation wave upwardly propagates, the concavity that tray body, hangnail and sockets for collecting energy are formed is anti-
It penetrates, is more concentrated at detonation wave to blasthole hole wall and propagates, reduce the boulder yield of ore-rock, increase burst strength;On the other hand, pallet
After explosive initiation above body, according to sockets for collecting energy principle, the energy near sockets for collecting energy is concentrated, and the explosive of surrounding keeps original
Power, and the energy concentrated then just is being used on the ore-rock of broken lower air compartment, reduces the big of the ore-rock of the part
Block rate improves production efficiency, increases economic benefit.
Compared with prior art, the invention has the following advantages: being directed to non-coal mine perron, underground medium-length hole
Etc. in a variety of explosions designs using Uncoincided charge, the complicated construction technique of blasthole Uncoincided charge, to the blasthole not degree of coupling
Controlling it is poor the problems such as, by the application external thread rod and bottom tray body cooperation, utilize the graduated scale of external thread rod
Know accurate control tray body and specifically fix position inside blasthole, passes through the airspace of the fixed control blast hole projectile filling of tray body
Length reaches the not degree of coupling accurately controlled in blasthole, keeps diffusion of the burst stress in hole more uniform, reduces ore-rock
Boulder yield obtains better demolition effect.By the pallet installation between blocking and powder charge, enhances the blocking intensity of blasthole, prevent
The only generation of chongtian mortar reduces slungshot, improves burst safety factor.
Detailed description of the invention:
The invention patent is further illustrated with reference to the accompanying drawing.
Fig. 1 is the structural schematic diagram of blasting charge and installation cumulative escapement of the present invention when igniting in blasthole;
Fig. 2 is the main view of cumulative escapement tray body;
Fig. 3 is the side view of cumulative escapement tray body;
Fig. 4 is the top view of cumulative escapement tray body;
Fig. 5 is cumulative escapement external thread rod schematic diagram;
Fig. 6 is schematic diagram after cumulative escapement external thread rod is connect with tray body;
In figure: I-partial size is not more than the stemming of 0.3cm;II-powdery or bag powder;III-airspace;
1- copper sheet;The upper hangnail of 2-;Hangnail under 3-;4- internal threaded column;5- tray body;61- suspension;62- internal beam rubber band;7 rubber band holes;
8- primacord hole;9 suspension rubber band buckles;The buckle of 10- internal beam rubber band;11- external thread rod;Back taper disk body K;M- blasthole wall.
Specific embodiment:
The present invention is further described with reference to the accompanying drawings and detailed description.
The present invention does not couple cumulative escapement and includes tray body 5 and be located at 5 periphery of tray body for blocking hole wall
Hangnail 2 and lower hangnail 3, the tray body 5 include back taper disk body K and are located on the upper surface back taper disk body K with internal screw thread
Internal threaded column 4, which can be entity material quality, be also possible to hollow, and the periphery of back taper disk body K is connected with
Copper sheet 1, upper hangnail 2 and lower hangnail 3 are connected on 1 outer peripheral surface of copper sheet, and the inner wall of the internal threaded column 4 is equipped with a suspension rubber band card
Button 9 is located at the rubber band hole 7 being equipped with below internal threaded column 4 for wearing rubber band, the lower hangnail upper surface on back taper disk body
It is equipped with the buckle 10 to internal beam rubber band, internal beam rubber band 61, the internal beam skin are equipped on the buckle on each lower hangnail surface
The internal beam end of muscle passes through rubber band hole and is connected on suspension rubber band buckle 9, is additionally provided on the tray body for wearing primacord
Primacord hole 8.
In the present embodiment, in order to design rationally, above-mentioned suspension rubber band buckle connected by two vertical scale coppers formed turn shape,
Oral area is upward.
In the present embodiment, in order to design rationally, external thread rod 11, the external thread rod table are bolted on above-mentioned internal threaded column
Face is provided with scale from bottom to top, and the scale is using external thread rod bottom as zero graduation line, using 5cm as unit scale, successively
Along shaft marking axially upwards.
In the present embodiment, in order to design rationally, above-mentioned upper hangnail connects shape by two rectangular copper thin slices with lower hangnail
At sharp cone distal, a short side of two rectangular copper thin slices is fixed together, and opposite short side is separately fixed on outside tray body
Zhou Shang, the buckle connect the shape that turns formed by two vertical copper sheets, and oral area is outwardly.
In the present embodiment, in order to design rationally, above-mentioned upper hangnail is staggered 15 ° with lower hangnail circumferencial direction to be arranged.
In the present embodiment, in order to design rationally, above-mentioned internal beam rubber band 62 is threaded through on the buckle on each lower hangnail surface and is formed
Circle generates pretension so as to receive in each lower hangnail, and the internal beam end of internal beam rubber band is placed on suspension rubber band buckle by drawing, interior
The internal beam section of beam rubber band is properly termed as suspension rubber band 61.
In the present embodiment, away from rubber band hole 7 is equipped at central axis 1.5cm on tray body, the rubber band hole is for running through
Rubber band is hung, the suspension rubber band material is rubber, and suppleness is big, is not easy to break.
In the present embodiment, the internal threaded column inner wall is away from setting suspension rubber band buckle 9, the suspension at capital down 2cm
Rubber band buckle is two vertical scale copper compositions, and ductility is strong.
In the present embodiment, the upper hangnail material is copper foil, and ductility is strong, and rigidity is big, convenient for being firmly embedded in hole wall.
In the present embodiment, the internal beam rubber band buckle is located at lower hangnail center 1cm on the upper side, and the internal beam rubber band buckle is two
Vertical scale copper composition, the internal beam rubber band material is rubber, and suppleness is big, is not easy to break.
In the present embodiment, primacord hole 8 is used to run through each section of explosive primacord, each interval primacord hole court
To consistent, convenient for worker's blast charging and interval work.
The present invention is included in non-coal mine and bores using structure of the cumulative escapement in non-coal mine blasthole is not coupled
If blasthole (blasthole formed blasthole wall M), be equipped at intervals with several from bottom hole to aperture in the blasthole and do not couple cumulative interval
Device, the cumulative escapement that do not couple include tray body 5 and are located at 5 periphery of tray body for blocking the upper hangnail 2 of hole wall
With lower hangnail 3, the tray body 5 is including back taper disk body K and is located on the upper surface back taper disk body K spiral shell in tool internal thread
Line column 4, the back taper disk body can be entity material quality, be also possible to hollow, and the periphery of back taper disk body K is connected with copper sheet 1,
Upper hangnail 2 and lower hangnail 3 are connected on 1 outer peripheral surface of copper sheet, and the inner wall of the internal threaded column 4 is equipped with a suspension rubber band buckle 9,
It is located at the rubber band hole 7 being equipped with below internal threaded column 4 for wearing rubber band on back taper disk body, the lower hangnail upper surface is equipped with
To the buckle 10 of internal beam rubber band, be equipped with internal beam rubber band 61 on the buckle on each lower hangnail surface, the internal beam rubber band it is interior
Shu Duan passes through rubber band hole and is connected on suspension rubber band buckle 9, and the primacord for wearing primacord is additionally provided on the tray body
Hole 8;Adjacent in blasthole fill part powder type explosive or bag powder II between cumulative escapement are not coupled and reserve sky
Gas interval III does not couple space between cumulative escapement and is not filled up completely full explosive adjacent.
Further, above-mentioned suspension rubber band buckle connects the shape that turns formed by two vertical scale coppers, and oral area is upward;In described
External thread rod is bolted in threaded post, the external thread rod surface is provided with scale from bottom to top, and the scale is with external thread rod
Bottom is zero graduation line, using 5cm as unit scale, successively along shaft marking axially upwards.
Further, above-mentioned upper hangnail is connected to form sharp cone distal with lower hangnail by two rectangular copper thin slices, two long
One short side of rectangular copper foil is fixed together, and opposite short side is separately fixed on tray body periphery, it is described buckle by
Two vertical copper sheets connect the shape that turns to be formed, and oral area is outwardly.
Further, above-mentioned upper hangnail is staggered 15 ° with lower hangnail circumferencial direction and is arranged;The internal beam rubber band be threaded through it is each under
Circle is formed on the buckle on hangnail surface, generates pretension so as to receive in each lower hangnail, the internal beam end of internal beam rubber band is hung by drawing
It is placed on suspension rubber band buckle.
The present invention does not couple cumulative escapement and has several advantages that
1, middle part back taper disk body cone mouth forms sockets for collecting energy downward, and sockets for collecting energy can well gather the explosion energy of each section of powder stick
Collection, then leads down, and the rock boulder yield that can solve blasthole bottom and compartment is high and the problems such as lumpiness is uneven.
2, it is marked with scale on external thread rod matched with internal threaded column, can more accurately determines stem length, makes demolition effect
Reach best.3, existing air-spacer mostly makes polyvinyl chloride plastic material bag expansion fashion realize that airspace is made using inflation
With, usually easily there is situations such as bag body is damaged, utilization rate is relatively low, and the present invention occurs from spacer structure, no this problem,
Utilization rate is high.4, it when the present invention is applied to interval blocking material and powder stick, can be reached a certain level by upper barb structure stifled
Fill in effect.
The present invention does not couple the application method of cumulative escapement, comprising the following steps:
Step S1: according to blasting design scheme, drilling device is utilized in designated position, digs out the blasthole of certain inclination angle and depth;
Step S2: whether before powder charge, rechecking in the depth and inclination angle and hole of each blasthole has water;
Step S3: determining the not degree of coupling in blasthole, determines each section of loaded length and Air space length;
Step S4: when powder type explosive or bag powder powder charge, when powder charge reaches a quarter of loaded length, it is put into primacord
Or after igniting primer, 3/4ths powder charge after the completion, it is desirable that suitably loaded length is detected in powder charge process;
Step S5: by the internal threaded column in the external thread rod precession tray body in cumulative escapement, the two is made to be connected to one
It rises;
Step S6: by the relative position of external thread rod high scale mark and blasthole aperture, primacord aperture in tray body is determined
Circumferential position, and the Nonel detonator of igniting primer or primacord are passed through into primacord hole;
Step S7: it according to the Air space length of design, is identified using external thread rod high scale, by what is connect with external thread rod
It pushes away and is put to accurate location under tray body is slow;
Step S8: by the frictional force of upper hangnail and blasthole inner wall in device, rotation external thread rod further gos deep into tray body
Female thread portion, destroy internal screw thread in suspension rubber band buckle, so that tray body is fixed on the corresponding position of blasthole, by external screw thread
Bar screws out the internal threaded column of tray body, extracts blasthole out;
Step S9: repeating the process of step S4 to step S8, until charge segment is completed;
Step S10: will be filled into blasthole in stemming around aperture, and reject the biggish stone of partial size, until ground.
Further, in step s 6, the fixation position by control tray body in blasthole, controls and does not couple in blasthole
Spend and accurately control Air space length.
In the present embodiment, in step s 4, the internal screw thread in the external thread rod precession tray body in cumulative escapement
The length of column is 5-7mm;
Further, in step s 8, rotation external thread rod further gos deep into the female thread portion of tray body until suspension rubber band
Buckle is corrupted such that in tray body that internal beam rubber band is switched to relax by tight state, and lower hangnail is due to internal beam rubber band in tray body
Relaxation and itself existing flexible deformation, during reinstatement, the space by blasthole inner wall is limited, cannot be complete
It restores to the original state, so that lower hangnail periphery and blasthole inner wall are in close contact and generate the pressure of increasing, by lower hangnail and blasthole
Frictional force between wall supports the load-bearing of tray body.
The present invention does not couple the tray body of cumulative escapement in inverted cone shape, is on the one hand support so as to form sockets for collecting energy
After explosive initiation below disk body, during detonation wave upwardly propagates, the concavity that tray body, hangnail and sockets for collecting energy are formed is anti-
It penetrates, is more concentrated at detonation wave to blasthole hole wall and propagates, reduce the boulder yield of ore-rock, increase burst strength;On the other hand, pallet
After explosive initiation above body, according to sockets for collecting energy principle, the energy near sockets for collecting energy is concentrated, and the explosive of surrounding keeps original
Power, and the energy concentrated then just is being used on the ore-rock of broken lower air compartment, reduces the big of the ore-rock of the part
Block rate improves production efficiency, increases economic benefit.
Compared with prior art, the invention has the following advantages: being directed to non-coal mine perron, underground medium-length hole
Etc. in a variety of explosions designs using Uncoincided charge, the complicated construction technique of blasthole Uncoincided charge, to the blasthole not degree of coupling
Controlling it is poor the problems such as, by the application external thread rod and bottom tray body cooperation, utilize the graduated scale of external thread rod
Know accurate control tray body and specifically fix position inside blasthole, passes through the airspace of the fixed control blast hole projectile filling of tray body
Length reaches the not degree of coupling accurately controlled in blasthole, keeps diffusion of the burst stress in hole more uniform, reduces ore-rock
Boulder yield obtains better demolition effect.By the pallet installation between blocking and powder charge, enhances the blocking intensity of blasthole, prevent
The only generation of chongtian mortar reduces slungshot, improves burst safety factor.
Above-listed preferred embodiment, has been further described the object, technical solutions and advantages of the present invention, is answered
Understand, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. one kind does not couple cumulative escapement, it is characterised in that: including tray body and be located at tray body periphery for blocking hole
The upper hangnail of wall and lower hangnail, the tray body include back taper disk body and are located on back taper disk body upper surface with internal screw thread
Internal threaded column, the inner wall of the internal threaded column is equipped with a suspension rubber band buckle, is located under internal threaded column on back taper disk body
Side is equipped with the rubber band hole for wearing rubber band, and the lower hangnail upper surface is equipped with the buckle to internal beam rubber band, falls at each time
It pierces on the buckle on surface and is equipped with internal beam rubber band, the internal beam end of the internal beam rubber band passes through rubber band hole and is connected to suspension rubber band buckle
On, the primacord hole for wearing primacord is additionally provided on the tray body.
2. one kind according to claim 1 does not couple cumulative escapement, it is characterised in that: suspension rubber band buckle by
Two vertical scale coppers connect the shape that turns to be formed, and oral area is upward.
3. one kind according to claim 1 does not couple cumulative escapement, it is characterised in that: be spirally connected on the internal threaded column
There is external thread rod, the external thread rod surface is provided with scale from bottom to top, and the scale was zero quarter with external thread rod bottom
Line is spent, using 5cm as unit scale, successively along shaft marking axially upwards.
4. one kind according to claim 1 does not couple cumulative escapement, it is characterised in that: the upper hangnail and lower hangnail
It connects to form sharp cone distal by two rectangular copper thin slices, a short side of two rectangular copper thin slices is fixed together, phase
Pair short side be separately fixed on tray body periphery, the buckle by two vertical copper sheets connects the shape that turns formed, and oral area is outwardly.
5. one kind according to claim 1 does not couple cumulative escapement, it is characterised in that: the upper hangnail and lower hangnail
Circumferencial direction, which is staggered 15 °, to be arranged.
6. one kind according to claim 1 does not couple cumulative escapement, it is characterised in that: the internal beam rubber band is threaded through
Circle is formed on the buckle on each lower hangnail surface, generates pretension so as to receive in each lower hangnail, the internal beam end of internal beam rubber band is led
Drawing is placed on suspension rubber band buckle.
7. a kind of use does not couple structure of the cumulative escapement in non-coal mine blasthole, it is characterised in that: be included in non-coal
The blasthole being drilled in mine is equipped at intervals with several from bottom hole to aperture in the blasthole and does not couple cumulative escapement, described
Cumulative escapement is not coupled to include tray body and be located at upper hangnail and lower hangnail that tray body periphery is used to block hole wall, it is described
Tray body includes back taper disk body and is located on back taper disk body upper surface tool internal thread internal threaded column, the internal threaded column
Inner wall be equipped with a suspension rubber band buckle, be located at below internal threaded column on back taper disk body and be equipped with rubber band for wearing rubber band
Hole, the lower hangnail upper surface are equipped with the buckle to internal beam rubber band, are equipped with internal beam on the buckle on each lower hangnail surface
Rubber band, the internal beam end of the internal beam rubber band pass through rubber band hole and are connected on suspension rubber band buckle, are additionally provided with use on the tray body
In the primacord hole for wearing primacord;In blasthole it is adjacent do not couple between cumulative escapement fill part powder type explosive or
Bag powder simultaneously reserves airspace.
8. feature exists according to claim 7 using structure of the cumulative escapement in non-coal mine blasthole is not coupled
In: the suspension rubber band buckle connects the shape that turns formed by two vertical scale coppers, and oral area is upward;It is bolted on the internal threaded column
External thread rod, the external thread rod surface are provided with scale from bottom to top, and the scale is using external thread rod bottom as zero graduation
Line, using 5cm as unit scale, successively along shaft marking axially upwards.
9. feature exists according to claim 7 using structure of the cumulative escapement in non-coal mine blasthole is not coupled
In: the upper hangnail is connected to form sharp cone distal with lower hangnail by two rectangular copper thin slices, and the one of two rectangular copper thin slices
Short side is fixed together, and opposite short side is separately fixed on tray body periphery, and the buckle is connected by two vertical copper sheets
What is formed turns shape, and oral area is outwardly.
10. feature exists according to claim 7 using structure of the cumulative escapement in non-coal mine blasthole is not coupled
In: the upper hangnail is staggered 15 ° with lower hangnail circumferencial direction to be arranged;The internal beam rubber band is threaded through the buckle on each lower hangnail surface
Upper formation circle generates pretension so as to receive in each lower hangnail, and the internal beam end of internal beam rubber band is placed in suspension rubber band card by drawing
It buckles.
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CN109373842A (en) * | 2018-12-18 | 2019-02-22 | 福州大学 | A kind of blasthole being applicable in non-coal mine does not couple cumulative escapement and its application method |
CN110779409A (en) * | 2019-09-17 | 2020-02-11 | 中国水利水电第四工程局有限公司 | Single-hole double-plug section type blasting method |
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CN207703092U (en) * | 2017-12-28 | 2018-08-07 | 中国电建集团成都勘测设计研究院有限公司 | Deep hole explosive airspace device |
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CN109373842A (en) * | 2018-12-18 | 2019-02-22 | 福州大学 | A kind of blasthole being applicable in non-coal mine does not couple cumulative escapement and its application method |
CN110779409A (en) * | 2019-09-17 | 2020-02-11 | 中国水利水电第四工程局有限公司 | Single-hole double-plug section type blasting method |
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