CN208505124U - A kind of electromagnetism memorial alloy double control priming device - Google Patents
A kind of electromagnetism memorial alloy double control priming device Download PDFInfo
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- CN208505124U CN208505124U CN201820696528.0U CN201820696528U CN208505124U CN 208505124 U CN208505124 U CN 208505124U CN 201820696528 U CN201820696528 U CN 201820696528U CN 208505124 U CN208505124 U CN 208505124U
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- electromagnetism
- spiral shell
- memorial alloy
- transmission part
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Abstract
A kind of electromagnetism memorial alloy double control priming device, belongs to blasting technique field.The utility model includes electromagnetism promotional implement, memorial alloy pin removal, detonation transmission part, electric cap, detonation component, ontology, steel ball, ball stud, driving spring, small pressure spiral shell, pressure spiral shell I, big pressure spiral shell and pressure spiral shell II.Usually detonation transmission part is locked in the position of separate electric cap by electromagnetism promotional implement and memorial alloy pin removal, and will not detonate detonation transmission part electric cap accidental action；After memorial alloy pin removal energization action, locking to detonation transmission part is released, detonation transmission part is pushed to electric cap to positive status, original place pushes ball stud that detonation transmission part is locked in state in place in the driving spring of compressive state by electromagnetism promotional implement energization action again.The utility model has many advantages, such as that remote controlled, locking is reliable, highly-safe.
Description
Technical field
The utility model belongs to blasting technique field, in particular to a kind of electromagnetism memorial alloy double control priming device.
Background technique
With the fast development of blasting technique, building explosion, the tasks such as dangerous material ignition tend to diversification and complicate, more
Need to have the characteristics that remote controlled, reliable effect, highly-safe come more demolition sets.
Current explosion initiation ends generally use electric cap or Nonel detonator detonates, using Nonel detonator or electricity
Detonator is generally susceptible to the interference of electrostatic, radio frequency electrical and stray electrical current as initiation ends, is easy to cause early quick-fried accident, deposit
In biggish security risk.
Utility model content
Aiming at the above defects or improvement requirements of the prior art, the utility model provides a kind of electromagnetism memorial alloy double control
Priming device, the control device for detonation of electric is using electromagnetism promotional implement and memorial alloy pin removal as constraint mechanism, by detonation transmission part
It is locked in the position far from electric cap, will not detonate detonation transmission part electric cap accidental action, while also having and locking in place
Determine function, the utility model has many advantages, such as remote controlled, highly-safe, reliable effect.
A kind of electromagnetism memorial alloy double control priming device of the utility model, which is characterized in that including electromagnetism promotional implement,
Memorial alloy pin removal, detonation transmission part, electric cap, detonation component, ontology and steel ball；
The electromagnetism promotional implement is made of armature, yoke, tension spring, solenoid component, sleeve and shell one, and armature is a step
Shape cylindrical body is made of big cylinder and small column, and big cylinder one end has tapped blind hole, to one end of fixed tension spring, great circle
The other end of column is inclined-plane, and the angle of the central axes of the inclined-plane and armature is 30 °, and one end of small column has screw thread, to even
Detonation transmission part is connect, yoke is a stepped cylindrical body, and the inner hollow of yoke, one end has bellmouth, the bellmouth and yoke
The angles of central axes be 30 °, solenoid component is made of coil holder and circle enameled wire, and circle enameled wire is on coil holder, coil holder material
Material is that non-magnetic metal material passes through walking for coil holder one end after one end of coil holder has cable hole, conducting wire to connect with circle enameled wire
String holes is drawn, and sleeve is a stepped cylindrical body, and inside has step-like big hole and threaded apertures, and tension spring is placed in sleeve,
Tension spring in step-like big hole is free state, can be with external force amoeboid movement, and the tension spring in threaded apertures is about
Pencil state, the armature, yoke and shell one are all made of electromagnetic pure iron material；Sleeve is non-magnet material, solenoid component suit
Between shell one and yoke, when the electromagnetic force between armature and yoke is greater than the drag of tension spring, yoke adsorbs armature motion；
The memorial alloy pin removal is by pin shaft, spring, pin removal pressure spiral shell, shell two, marmem sleeve and leads
Line is constituted, and usually marmem sleeve limits pin shaft, spring and pin shaft is limited in original state, spring is in
Compressive state, when marmem sleeve is powered it is heated after, marmem sleeve temperature distortion, along internal diameter direction to
External diameter expansion releases the limitation to pin shaft, and the spring driving bearing pin movement in compressive state reaches memorial alloy pin removal
The pin shaft of outside pulls out back；
The detonation transmission part is made of shell, booster gains, flame proof block and paper washer, and wherein shell is a stepped cylindrical
Body, one end have blind hole, and booster gains is placed in the blind hole, have a circle uniform around the corresponding upper outer circumference of the blind hole of shell
The circular groove of distribution, the setting of circular groove reduce the intensity of shell, when ensure that detonation transmission part movement in place, electric thunder
Pipe reliably breaks through the obstruction of shell, and detonate booster gains, and blind via bottom has chamfering, and the middle part of shell has trapezoidal groove, should
The angle that lower inclined plane forms on trapezoidal groove is 90 °~150 °, so set, guaranteeing that steel ball reliably releases the lock to detonation transmission part
Fixed, the other end of shell has threaded hole, and by rolling to tube shell bottom chamfering, booster gains, paper washer and flame proof block are encapsulated
In shell, detonation transmission part is fixed on electromagnetism promotional implement by the threaded hole on shell, and the setting of paper washer ensure that booster explosive
Column is compacted, the setting of flame proof block, when ensure that detonation transmission part is locked, even if electric cap accidental action, due to flame proof block
In the presence of electric cap will not ignite booster gains；
The electric cap is placed in the corresponding aperture of ontology, electric cap far from detonation component, the output end face of electric cap every
Quick-fried piece, even if electric cap accidental action, due to the presence of flame proof block, flame proof block can decline the output detonation power of electric cap
Subtract, electric cap will not detonate booster gains and detonation component, when detonation transmission part movement in place after, electric cap face booster gains
Position, booster gains face primary explosive column can detonate booster gains after electric cap effect at this time, and booster gains detonates detonation in turn
Powder column；
The detonation component is made of primary explosive column, medicine seat and protection pad, and protection pad is the aluminium foil of 0.3mm~0.5mm thickness, glue
Stickup is attached on medicine seat, and the big cylindrical section in medicine seat outer end has screw thread, is fixed detonation component on the body by the screw thread.
Further, a kind of electromagnetism memorial alloy double control priming device also has ball stud, driving spring, small pressure
Spiral shell, pressure spiral shell I, big pressure spiral shell and pressure spiral shell II, ball stud, driving spring and small pressure spiral shell constitute locking mechanism, when electromagnetism pin removal and electromagnetism
After the successive energization action of promotional implement, electric cap, detonation transmission part and detonation component are in positive status, are now in compressive state
Detonation transmission part is locked in state in place by driving spring driving ball stud, and pressure spiral shell I, big pressure spiral shell and pressure spiral shell II are respectively to fixed electric thunder
The middle part of pipe, electromagnetism promotional implement and electromagnetism pin removal, pressure spiral shell I, big pressure spiral shell and pressure spiral shell II all has through-hole, and electric cap, electromagnetism push away
The lead-out wire for selling device and electromagnetism pin removal is drawn from the through-hole of each pressure spiral shell.
Further, the circle enamel-cover linear diameter of the electromagnetism promotional implement is 0.2mm~0.4mm, the stroke of electromagnetism promotional implement
For 3mm~3.5mm.
Further, the circle enamel-cover linear diameter of the electromagnetism promotional implement is 0.3mm, and the stroke of electromagnetism promotional implement is 3.5mm.
Such setting is because electromagnetism promotional implement will drive detonation transmission part, in order to guarantee reset condition (electric cap and flame proof
Block is to just, the state of detonation transmission part and detonation component sequence) when, propagation of explosion portion will not be ignited electric cap accidental action
Part, inevitable requirement detonation transmission part farther out, require the stroke of electromagnetism promotional implement larger accordingly apart from electric cap, while to guarantee to pass
Quick-fried component reliable movement in place, electromagnetism promotional implement to overcome detonation transmission part and ontology corresponding aperture frictional force and ball stud and
The hindering factors such as the normal pressure that driving spring forms detonation transmission part, the driving force of inevitable requirement electromagnetism promotional implement is larger, therefore circle
Enameled wire accordingly selects larger line footpath.
The working principle of the utility model is as follows:
Usually, detonation transmission part is locked in the reset condition of separate electric cap by memorial alloy pin removal and electromagnetism promotional implement,
Even if electric cap accidental action will not ignite detonation transmission part.
After memorial alloy pin removal is powered, the resistance exercise of steel ball is overcome in place, then to electromagnetism promotional implement to be powered,
Electromagnetism promotional implement pushes detonation transmission part to move to booster gains and electric cap to positive state, and at the same time, driving spring pushes ball
Detonation transmission part is locked in state in place by head pin, even if electromagnetism promotional implement powers off, detonation transmission part will not return to reset condition, when
After electric cap is connected to firing command again, detonation transmission part, detonation transmission part and then ignition detonation component are ignited in electric cap effect.
The beneficial effects of the utility model are embodied in:
A) detonation transmission part is locked in far from electric thunder as constraint mechanism using memorial alloy pin removal and electromagnetism promotional implement
The position of pipe, will not detonate detonation transmission part electric cap accidental action, and memorial alloy pin removal and electromagnetism promotional implement pass through
Connecting cable can remotely issue action command, improve the safety of entire mechanism；
B) friction factor is further decreased as transmission mechanism using steel ball, while the work for improving entire mechanism can
By property；
C) setting of spring and ball stud is driven, it is ensured that detonation transmission part moves in place and can be positively locked in shape in place
State improves the Reliability of Microprocessor of entire mechanism.
Detailed description of the invention
Fig. 1 is a kind of electromagnetism memorial alloy double control priming device original state figure of the utility model；
Fig. 2 is a kind of electromagnetism memorial alloy double control priming device state diagram in place of the utility model；
Fig. 3 is a kind of electromagnetism promotional implement original state figure of electromagnetism memorial alloy double control priming device of the utility model；
Fig. 4 is a kind of electromagnetism promotional implement state diagram in place of electromagnetism memorial alloy double control priming device of the utility model；
Fig. 5 is a kind of memorial alloy pin removal original state of electromagnetism memorial alloy double control priming device of the utility model
Figure；
Fig. 6 is a kind of memorial alloy pin removal of electromagnetism memorial alloy double control priming device of the utility model state in place
Figure；
Fig. 7 is that a kind of detonation transmission part of electromagnetism memorial alloy double control priming device of the utility model forms figure；
Fig. 8 is a kind of shell structure figure of electromagnetism memorial alloy double control priming device of the utility model；
Fig. 9 is a kind of detonation component diagram of electromagnetism memorial alloy double control priming device of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and specifically
Embodiment is described in further detail the utility model.It should be appreciated that specific embodiment described herein is only used to solve
The utility model is released, is not used to limit the utility model.In addition, in the various embodiments of the present invention described below
Involved technical characteristic can be combined with each other as long as they do not conflict with each other.
A kind of electromagnetism memorial alloy double control priming device better embodiment of the utility model, structure and component relationship
As depicted in figs. 1 and 2, which is characterized in that including electromagnetism promotional implement 1, memorial alloy pin removal 2, detonation transmission part 3, electric cap 4,
Detonate component 5, ontology 6 and steel ball 7；
The electromagnetism promotional implement 1 as shown in Figure 3 and Figure 4, by armature 1-1, yoke 1-2, tension spring 1-3, solenoid component 1-4,
Sleeve 1-5 and one 1-6 of shell composition, armature 1-1 are a stepped cylindrical body, are made of big cylinder and small column, big cylinder one
End has tapped blind hole, and to one end of fixed tension spring 1-3, the other end of big cylinder is inclined-plane, in the inclined-plane and armature 1-1
The angle of axis is 30 °, and one end of small column has screw thread, and to connect detonation transmission part 3, yoke 1-2 is a stepped cylindrical
Body, the inner hollow of yoke 1-2, one end have bellmouth, and the bellmouth and the angle of the central axes of yoke 1-2 are 30 °, line packet
Component 1-4 is made of coil holder and circle enameled wire, and circle enameled wire is on coil holder, and coil holder material is 7A09 aluminum material, coil holder
It after one end has cable hole, conducting wire to connect with circle enameled wire, is drawn by the cable hole of coil holder one end, sleeve 1-5 is one step-like
Cylindrical body, inside have step-like big hole and threaded apertures, and tension spring 1-3 is placed in sleeve 1-5, in step-like big hole
Tension spring 1-3 be free state, can be with external force amoeboid movement, tension spring 1-3 in threaded apertures is restrained condition, described
Armature 1-1, yoke 1-2 and one 1-6 of shell are all made of electromagnetic pure iron DT4C material；Sleeve 1-5 is 7A09 aluminum material, line package
Part 1-4 is sleeved between shell one 1-6 and yoke 1-2, after being powered to solenoid component 1-4, between armature 1-1 and yoke 1-2
The electromagnetic force of formation is greater than the drag of tension spring 1-3, and yoke 1-2 adsorbs armature 1-1 movement, and electromagnetism promotional implement 1 at this time is by Fig. 3
Shown in original state move to state in place as shown in Figure 4；
The memorial alloy pin removal 2 presses spiral shell 2-3, shell as shown in Figure 5 and Figure 6, by pin shaft 2-1, spring 2-2, pin removal
Two 2-4 of body, marmem sleeve 2-5 and conducting wire are constituted, and usually marmem sleeve 2-5 limits pin shaft 2-1
Position, is limited in the original state such as Fig. 5 for spring 2-2 and pin shaft 2-1, and spring 2-2 is in compressive state, when shape memory closes
Golden sleeve 2-5 be powered it is heated after, marmem sleeve 2-5 temperature distortion releases pair along internal diameter direction to external diameter expansion
The limitation of pin shaft 2-1, the spring 2-2 driving bearing pin 2-1 movement in compressive state reach 2 outside of memorial alloy pin removal
Pin shaft 2-1 pull out back, the state moved in place is as shown in Figure 6；
The detonation transmission part 3 as shown in fig. 7, be made of shell 3-1, booster gains 3-2, flame proof block 3-3 and paper washer 3-4,
Wherein shell 3-1 is as shown in figure 8, be a stepped cylindrical body, there is blind hole 3-1a, booster gains 3-2 to be placed in the blind hole for one end
In 3-1a, there is the equally distributed circular groove 3-1c of a circle around the corresponding upper outer circumference of blind hole 3-1a of shell 3-1, it is blind
The hole bottom 3-1a has chamfering 3-1e, and the middle part of shell 3-1 has trapezoidal groove 3-1b, lower inclined plane group on trapezoidal groove 3-1b
At angle be 120 °, the other end of shell 3-1 has threaded hole 3-1d, by being rolled to shell 3-1 bottom chamfer 3-1e,
Booster gains 3-2, paper washer 3-4 and flame proof block 3-3 are encapsulated in shell 3-1, detonation transmission part 3 passes through the screw thread on shell 3-1
Hole 3-1d is fixed on electromagnetism promotional implement 1；
The electric cap 4 is placed in the corresponding aperture of ontology 6, and electric cap 4 is rectified far from detonation component 5, the output of electric cap 4
To flame proof block 3-3；
As shown in figure 9, being made of primary explosive column 5-1, medicine seat 5-2 and protection pad 5-3, protection pad 5-3 is the detonation component 5
The aluminium foil of 0.5mm thickness, gluing are attached on medicine seat 5-2, and the big cylindrical section in the outer end medicine seat 5-2 has screw thread, will be risen by the screw thread
Quick-fried component 5 is fixed on ontology 6.
Further, the present embodiment also has ball stud 8, driving spring 9, small pressure spiral shell 10, pressure spiral shell I 11, big pressure spiral shell 12 and pressure
Spiral shell II 13, ball stud 8, driving spring 9 and small pressure spiral shell 10 constitute locking mechanism, and detonation transmission part 3 is locked in state in place, presses spiral shell I
11, pressure spiral shell 12 and pressure spiral shell II 13 press spiral shell I respectively to fixed electric cap 4, electromagnetism promotional implement 1 and memorial alloy pin removal 2 greatly
11, the middle part of pressure spiral shell 12 and pressure spiral shell II 13 greatly all has through-hole, the extraction of electric cap 4, electromagnetism promotional implement 1 and electromagnetism pin removal 2
Line from pressure spiral shell I 11, big pressure spiral shell 12 and presses the middle through-hole of spiral shell II 13 to draw respectively, external cable.
Further, the circle enamel-cover linear diameter of the electromagnetism promotional implement 1 is 0.3mm, and the stroke of electromagnetism promotional implement 1 is
3.5mm。
The working principle of the present embodiment is as follows:
Usually, detonation transmission part 3 is locked in the original shape of separate electric cap 4 by memorial alloy pin removal 2 and electromagnetism promotional implement 1
State, even if 4 accidental action of electric cap, will not ignite detonation transmission part 3.
After being powered by cable remote to memorial alloy pin removal 2, memorial alloy pin removal 2 overcomes the resistance of steel ball 7
Movement in place, then by cable remote is powered to electromagnetism promotional implement 1, and electromagnetism promotional implement 1 pushes detonation transmission part 3 to move to biography
Quick-fried powder column 3-2 and electric cap 4 are to positive state, and at the same time, driving spring 9 pushes ball stud 8 to be locked in detonation transmission part 3 in place
State, even if electromagnetism promotional implement 1 powers off, detonation transmission part 3 will not return to reset condition, when electric cap 4 is connected to firing command again
Afterwards, electric cap 4 acts on, and ignites detonation transmission part 3, detonation transmission part 3 and then ignition detonation component 5.
The above is only the preferred embodiment of the utility model, it should be pointed out that: for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (4)
1. a kind of electromagnetism memorial alloy double control priming device, which is characterized in that pulled out including electromagnetism promotional implement (1), memorial alloy
Sell device (2), detonation transmission part (3), electric cap (4), detonation component (5), ontology (6) and steel ball (7)；
The electromagnetism promotional implement (1) is by armature (1-1), yoke (1-2), tension spring (1-3), solenoid component (1-4), sleeve (1-5)
It is formed with shell one (1-6), armature (1-1) is a stepped cylindrical body, is made of big cylinder and small column, big cylinder one end tool
There is tapped blind hole, to the one end of fixed tension spring (1-3), the other end of big cylinder is inclined-plane, in the inclined-plane and armature (1-1)
The angle of axis is 30 °, and one end of small column has screw thread, and to connect detonation transmission part (3), yoke (1-2) is one step-like
Cylindrical body, the inner hollow of yoke (1-2), one end have bellmouth, and the bellmouth and the angle of the central axes of yoke (1-2) are
30 °, solenoid component (1-4) is made of coil holder and circle enameled wire, and for circle enameled wire on coil holder, coil holder material is non-magnetic
Metal material after one end of coil holder has cable hole, conducting wire to connect with circle enameled wire, is drawn, set by the cable hole of coil holder one end
Cylinder (1-5) is a stepped cylindrical body, and inside has step-like big hole and threaded apertures, and tension spring (1-3) is placed in sleeve (1-5)
Interior, the tension spring (1-3) in step-like big hole is free state, can be with external force amoeboid movement, in threaded apertures
Tension spring (1-3) is restrained condition, and the armature (1-1), yoke (1-2) and shell one (1-6) are all made of electromagnetic pure iron material；Set
Cylinder (1-5) is non-magnet material, and solenoid component (1-4) is sleeved between shell one (1-6) and yoke (1-2), as armature (1-1)
When electromagnetic force between yoke (1-2) is greater than the drag of tension spring (1-3), yoke (1-2) adsorbs armature (1-1) movement；
The memorial alloy pin removal (2) presses spiral shell (2-3), shell two (2-4), shape by pin shaft (2-1), spring (2-2), pin removal
Shape memory alloys sleeve (2-5) and conducting wire are constituted, and usually marmem sleeve (2-5) limits pin shaft (2-1), will
Spring (2-2) and pin shaft (2-1) are limited in original state, and spring (2-2) is in compressive state, when marmem sleeve
After (2-5) energization is heated, marmem sleeve (2-5) temperature distortion is released along internal diameter direction to external diameter expansion to pin
The limitation of axis (2-1), spring (2-2) driving bearing pin (2-1) movement in compressive state, reaches memorial alloy pin removal
(2) pin shaft (2-1) outside pulls out back；
The detonation transmission part (3) is made of shell (3-1), booster gains (3-2), flame proof block (3-3) and paper washer (3-4), wherein
Shell (3-1) is a stepped cylindrical body, and one end has blind hole (3-1a), and booster gains (3-2) is placed in the blind hole (3-1a),
There is an equally distributed circular groove (3-1c) of circle, blind hole around the corresponding upper outer circumference of the blind hole (3-1a) of shell (3-1)
The bottom (3-1a) has chamfering (3-1e), and the middle part of shell (3-1) has trapezoidal groove (3-1b), on the trapezoidal groove (3-1b)
The angle of lower inclined plane composition is 90 °~150 °, and the other end of shell (3-1) has threaded hole (3-1d), by shell (3-1)
Bottom chamfer (3-1e) rolling, booster gains (3-2), paper washer (3-4) and flame proof block (3-3) are encapsulated in shell (3-1), are passed
Quick-fried component (3) is fixed on electromagnetism promotional implement (1) by the threaded hole (3-1d) on shell (3-1)；
The electric cap (4) is placed in the corresponding aperture of ontology (6), electric cap (4) far from detonation component (5), electric cap (4) it is defeated
Outlet face flame proof block (3-3)；
The detonation component (5) is made of primary explosive column (5-1), medicine seat (5-2) and protection pad (5-3), and protection pad (5-3) is 0.3mm
The aluminium foil of~0.5mm thickness, gluing are attached on medicine seat (5-2), and the big cylindrical section in the outer end medicine seat (5-2) has screw thread, pass through the spiral shell
Detonation component (5) is fixed on ontology (6) by line.
2. a kind of electromagnetism memorial alloy double control priming device according to claim 1, which is characterized in that also have bulb
It sells (8), driving spring (9), small pressure spiral shell (10), pressure spiral shell I (11), press spiral shell (12) and pressure spiral shell II (13), ball stud (8), driving spring greatly
(9) and small pressure spiral shell (10) constitutes locking mechanism, detonation transmission part (3) is locked in state in place, pressure spiral shell I (11) presses spiral shell (12) greatly
Through-hole is all had in the middle part of spiral shell II (13) with pressing, pressure spiral shell I (11) presses greatly spiral shell (12) and pressure spiral shell II (13) respectively to fixed electricity thunder
Manage (4), electromagnetism promotional implement (1) and memorial alloy pin removal (2).
3. a kind of electromagnetism memorial alloy double control priming device according to claim 1, it is characterised in that:
The circle enamel-cover linear diameter of the electromagnetism promotional implement (1) is 0.2mm~0.4mm, the stroke of electromagnetism promotional implement (1) be 3mm~
3.5mm。
4. a kind of electromagnetism memorial alloy double control priming device according to claim 1 or 3, it is characterised in that:
The circle enamel-cover linear diameter of the electromagnetism promotional implement (1) is 0.3mm, and the stroke of electromagnetism promotional implement (1) is 3.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820696528.0U CN208505124U (en) | 2018-05-10 | 2018-05-10 | A kind of electromagnetism memorial alloy double control priming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820696528.0U CN208505124U (en) | 2018-05-10 | 2018-05-10 | A kind of electromagnetism memorial alloy double control priming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208505124U true CN208505124U (en) | 2019-02-15 |
Family
ID=65298310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820696528.0U Expired - Fee Related CN208505124U (en) | 2018-05-10 | 2018-05-10 | A kind of electromagnetism memorial alloy double control priming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208505124U (en) |
-
2018
- 2018-05-10 CN CN201820696528.0U patent/CN208505124U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190215 |
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| CF01 | Termination of patent right due to non-payment of annual fee |