CN207882098U - Make the abrasion tester of pick firm by ramming - Google Patents
Make the abrasion tester of pick firm by ramming Download PDFInfo
- Publication number
- CN207882098U CN207882098U CN201720743515.XU CN201720743515U CN207882098U CN 207882098 U CN207882098 U CN 207882098U CN 201720743515 U CN201720743515 U CN 201720743515U CN 207882098 U CN207882098 U CN 207882098U
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- Prior art keywords
- pick
- ramming
- connect
- firm
- ballast
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Abstract
The utility model discloses a kind of abrasion testers for making pick firm by ramming, including pneumatic hammer fuselage, tup, tamping tool, ballast slot, motor, cam and elasticity reset device, the tup is connect with the pneumatic hammer fuselage, the tamping tool is connect with the tup, the ballast slot is set to below the tamping tool, movable striker plate is arranged in ballast slot side, one elasticity reset device is set between the striker plate and the cam, the cam is connect with the motor, the motor drives the cam rotation, the cam pushes the elasticity reset device and striker plate to do reciprocating.The utility model is simple in structure, and experimental reliability is high.
Description
Technical field
The utility model is related to railway tamping pick head degree of wear experimental technique fields, and in particular to one kind making pick firm by ramming
Abrasion tester.
Background technology
China's national territorial area ranks the third of the world, thing span 5400km, north and south span 5200km, various regions resource distribution in addition
Difference, this makes the mutual transport of domestic goods and materials become inevitable, and railway transportation has compared to the means of transportation of other forms
The features such as haul distance is long, and freight volume is big, at low cost, speed, therefore railway transportation is handed in the national economic development and regional substance
It changes and plays an important role, but the line service of railway is also very heavy, wherein railway ballast ballast is exactly loosely day
The problem often safeguarded can usually be used to hand vibrating cylinder or be made firm by ramming so that ballast is closely arranged again under sleeper
Vehicle fulfils assignment, and due to generating severe friction with ballast under high speed vibration, the abrasion of tamping pick head is extremely serious.This practicality
The novel working condition by simulating tamping pick head provides effective experimental data to develop wear-resistant tamping pickaxe worth material；
The utility model is characterized by cam mechanism and completes ballast loose handling, and vibrations are made in tamping tool completion firm by ramming, and pneumatic hammer drives
Tamping tool moves up and down.For pneumatic hammer, application No. is 201620516585.7 Chinese patents to disclose a kind of intelligent air
Hammer, main includes hammering body into shape, working cylinder, the parts such as intelligent pressure regulating controller, and fundamental diagram meets the air of this experiment porch
Hammer traction element into shape.Since both rear market has matured product so that this testing machine system is realized more convenient.
Utility model content
The utility model overcomes the deficiencies in the prior art, provides a kind of wear test realized and more easily make pick firm by ramming
Machine.
In view of the above problem of the prior art, according to one side disclosed by the utility model, the utility model uses
Following technical scheme：
A kind of abrasion tester for making pick firm by ramming, including it is pneumatic hammer fuselage, tup, tamping tool, ballast slot, motor, convex
Wheel and elasticity reset device, the tup are connect with the pneumatic hammer fuselage, and the tamping tool is connect with the tup, the stone
Quarrel slot is set to below the tamping tool, and movable striker plate, the striker plate and the cam is arranged in ballast slot side
Between an elasticity reset device is set, the cam connect with the motor, and the motor drive cam revolves
Turn, the cam pushes the elasticity reset device and striker plate to do reciprocating.
In order to which the utility model is better achieved, further technical solution is：
An embodiment according to the present utility model, the elasticity reset device include reciprocating lever, supporting rack A, spring
With idler wheel B, it is set to described reciprocating lever one end for the idler wheel B with the cam engagement, the reciprocating lever other end is logical
It crosses bolt connection piece C with the attachment device on the outside of the striker plate to be connected, the spring is set on the reciprocating lever, described
The fixed block that spring one end setting one is fixedly connected with the reciprocating lever, the spring other end setting one can be relatively described past
The sliding block of compound lever sliding, the sliding block are fixedly connected with support frame as described above A.
Idler wheel A connecting shafts, the idler wheel A are arranged on the striker plate for another embodiment according to the present utility model
Setting idler wheel A, the idler wheel A can be slided on the ballast slot at connecting shaft both ends.
Another embodiment according to the present utility model is arranged for the sliding to the idler wheel A on the ballast slot
The lower retainer and upper retainer that position is limited.
Chip ballast collecting tank is arranged in another embodiment according to the present utility model, ballast slot lower part.
Another embodiment according to the present utility model, the tamping tool include tamping tool fuselage, gasoline engine, power biography
Delivery device, pick clamping device and tamping pick head, the tamping tool fuselage are fixedly connected with the tup, and the gasoline engine is set
It is placed on the tamping tool fuselage, the power transmission is located in the tamping tool fuselage and connects the gasoline engine and institute
Pick clamping device is stated, the pick clamping device is connect with the tamping pick head.
Another embodiment according to the present utility model, the power transmission include worm shaft, worm gear, bent axle,
Connecting rod and piston, the worm shaft are connect with the gasoline engine, the worm shaft again with the worm gear, the worm gear and institute
Bent axle connection is stated, the connecting rod is connect with the bent axle, and the piston is connect with the connecting rod, and the piston is located at piston bore
Interior, pick clamping device one end is connect with piston bore, and the pick clamping device other end is connect with tamping pick head.
Pitman shaft is arranged in the junction of another embodiment according to the present utility model, the connecting rod and the bent axle
Watt.
The utility model can also be：
Sensor stand, the sensor is arranged on the ballast slot in another embodiment according to the present utility model
Laser photoelectricity sensor is set on holder, and the laser photoelectricity sensor is connect with one-chip computer module again.
Another embodiment according to the present utility model further includes pedestal and ballast slot supporting rack, the pneumatic hammer machine
Body, motor and ballast slot supporting rack are all set on the pedestal, and the ballast slot is set on the ballast slot supporting rack.
Compared with prior art, one of the beneficial effects of the utility model are：
A kind of abrasion tester for making pick firm by ramming of the utility model, has：
1, the recovery of rear building stones state is made firm by ramming by being implemented in combination with for cam mechanism and ballast slot each time, is ground for pick
The reliability of damage experimental result provides guarantee；
2, it is smash by the tamping tool device altitude simulation after selecting pneumatic hammer device ripe on the market and simplifying
Gu working condition when machine operation；
3, this experiment crane platform structure is simple, convenient for building.
Description of the drawings
Illustrate present specification embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment
Or attached drawing needed in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the reference to some embodiments in present specification, for those skilled in the art, what is do not made the creative labor
In the case of, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the abrasion tester structural schematic diagram for making pick firm by ramming according to the utility model one embodiment.
Fig. 2 is the structural schematic diagram according to the power transmission of the utility model one embodiment.
Fig. 3 is the pneumatic hammer baric systerm principle schematic according to the utility model one embodiment.
Wherein, entitled corresponding to the reference numeral in attached drawing：
1- pedestals, 2- belt wheels, 3- pneumatic hammer fuselages, 4- tups, 5- bolt connection pieces A, 6- make machine cap firm by ramming,
7- tamping tool fuselages, 8- gasoline engines, 9- gasoline engine racks, 10- piston bores, 11- pick clamping devices, 12- make firm by ramming
Pick pick, 13- ballast slots, 14- laser photoelectricity sensors, 15- sensor stands, 16- bolt connection pieces B, 17- monolithic
Machine module, 18- ballast slot supporting racks, 19- screws A, 20- triangle floor, 21- chip ballast collecting tanks, 22- backgauges
Plate, 23- bolt connection pieces C, 24- screw B, 25- supporting rack A, 26- motor, 27- idler wheels A, 28- spring, 29- rollings
Take turns B, 30- cams, 31- idler wheel A connecting shafts, retainer under 32-, the upper retainers of 33-, 34- bearing A end caps, 35- axis
Hold A, 36- worm shafts, 37- worm gears, 38- bent axles, 39- screws C, 40- connecting rod bearing shell, 41- connecting rods, 42- pistons,
43- piston pins, 44- bearings B, 45- bearing B end caps.
Specific implementation mode
The utility model is described in further detail with reference to embodiment, but the embodiment of the utility model is not
It is limited to this.
As shown in Figure 1, Fig. 1 shows the knot of the abrasion tester for making pick firm by ramming according to the utility model one embodiment
A kind of structure, abrasion tester for making pick firm by ramming, is related to such as lower component：
Pneumatic hammer traction element：Its pneumatic hammer may include the components such as pneumatic hammer fuselage 3, tup 4 and belt wheel 2, tup 4 and sky
Pneumatic hammer fuselage 3 is connected and can be moved up and down, and has belt wheel 2 on pneumatic hammer fuselage 3.Pneumatic hammer can be structure as shown in Figure 1,
It can be with existing other structures.Wherein 4 lower end tablet of tup is bolted part A 5 and is connected with tamping tool fuselage 7, passes through tup
4 up and down motion in the cylinder and then traction tamping tool movement, concrete structure can refer to existing procucts on the market, due to making firm by ramming
Pick is per minute when working normally to make number firm by ramming about at 18~25 times and in view of making process firm by ramming, therefore selected pneumatic hammer should expire
Foot fast feed when moving downward, work feed when making firm by ramming, these three working conditions of fast fallback, the utility model are attached when rising
A kind of pneumatic hammer baric systerm figure is provided in Fig. 3 and electromagnet action sequence list, operation principle are as follows：When two five energization magnetic
When reversal valve 1YA obtains electric, right position work, gas pressure is in the rodless cavity of cylinder, and the gas of rod chamber is through 2/2-way electromagnetism
Reversal valve left position is quickly discharged, that is, realizes the fast feed campaign of piston rod；When piston rod proceeds to travel switch 2XK, 2XK
It is electric that signalling makes 2YA obtain, and the right position work of 2/2-way solenoid directional control valve, the circuit are cut off at this time, and rod chamber gas can only lead to
The one-way throttle valve discharge for crossing larger air resistance, that is, realize the work feed campaign of piston rod；Piston rod proceeds to stroke
When switch 1XK, 1XK signallings make 1YA dead electricity, at this time two five electric change valve left positions work, and gas pressure is in cylinder
Rod chamber, and the gas of rodless cavity is quickly discharged through check valve, that is, realizes the fast fallback movement of piston rod.
Tamping tool shaking part：The tup 4 of the tamping tool and pneumatic hammer connects, and tamping tool may include tamping tool fuselage 7, vapour
Oil machine 8, power transmission, pick clamping device 11 and tamping pick head 12, setting tamping tool top on the tamping tool fuselage 7
Lid 6, the tamping tool fuselage 7 be bolted part A be connected with the transverse slat on tup 4 realize the tamping tool fuselage 7 with
Tup 4 is fixedly connected, and the gasoline engine 8 is set on the tamping tool fuselage 7, and the power transmission is located at described smash
Gu in machine fuselage 7 and connecting the gasoline engine 8 and the pick clamping device 11, the pick clamping device 11 is made firm by ramming with described
Pick pick 12 connects.
As shown in Fig. 2, Fig. 2 shows the structure according to the power transmission of the utility model one embodiment, packet
Worm shaft 36, worm gear 37, bent axle 38, connecting rod 41 and piston 42 are included, the worm shaft 36 is connect with the gasoline engine 8, the snail
Bar axis 36 coordinates with the worm gear 37 again, and the worm gear 37 is connect with the bent axle 38, and the connecting rod 41 connects with the bent axle 38
It connects, it is preferred that can connecting rod bearing shell 40 be set in the junction of connecting rod 41 and the bent axle 38；The piston 42 and the connecting rod 41
Connection, the piston 42 are located in piston bore 10, and described 11 one end of pick clamping device is connect with piston bore 10, the pick
Head 11 other end of clamping device is connect with tamping pick head 12.It is made firm by ramming more specifically, worm shaft 36 is fixed on by a pair of bearings A
On machine fuselage 7, the gasoline engine 8 is located in gasoline engine rack 9, and the worm gear 37 on bent axle 38 is nibbled with 36 phase of above-mentioned worm shaft
It closes, setting bearing A35 and bearing A end caps 34 on worm shaft 36, the bent axle 38 is fixed on by a pair of bearings B 44 makes firm by ramming
On machine fuselage 7, and setting bearing B end caps 45 thereon, 41 major part of connecting rod passes through screw C 39 and 40 phase of connecting rod bearing shell
Revolute pair even and with the crank throw on bent axle 38 is formed, the piston 42 is connected by piston pin 43 with 41 lower end of connecting rod.
Gasoline engine 8 is located in gasoline engine rack 9 to move up and down together with tamping tool, and the gasoline engine 8 imparts power to
Worm shaft 36, since worm shaft 36 is engaged with the worm gear 37 on bent axle 38,41 lower end of connecting rod is connected by piston pin 43 and piston 42
Connect and under the drive of bent axle 38 in piston bore 10 high-speed motion up and down, impact force is passed into tamping pick head 12, it is real
Now shake.
Ballast process part：Ballast slot 13 is set to below the tamping tool, and 13 side of the ballast slot setting is movable
Striker plate 22, between the striker plate 22 and the cam 30 be arranged an elasticity reset device, the cam 30 with it is described
Motor 26 connect, the motor 26 drive the cam 30 rotate, the cam 30 push the elasticity reset device and
Striker plate 22 does reciprocating.Idler wheel A connecting shafts 31 can be also set on striker plate 22, and 31 both ends of idler wheel A connecting shafts are set
Setting idler wheel A27, the idler wheel A27 can slide on the ballast slot 13；It is arranged for the idler wheel A27 on ballast slot 13
The lower retainer 32 that is limited of sliding position and upper retainer 33.Chip ballast collecting tank 21 can be arranged in 13 lower part of ballast slot.
Wherein, elasticity reset device may include reciprocating lever, supporting rack A25, spring 28 and idler wheel B29, for it is described convex
The idler wheel B29 of 30 cooperation of wheel is set to described reciprocating lever one end, and the reciprocating lever other end passes through the bolt connection piece
C23 is connected with the attachment device in 22 outside of the striker plate, and the spring 28 is set on the reciprocating lever, the spring
The fixed block that 28 one end setting one is fixedly connected with the reciprocating lever, 28 other end of spring setting one can be relatively described past
The sliding block of compound lever sliding, the sliding block are fixedly connected with support frame as described above A25.That is idler wheel A 27 is total by cam 30 and spring 28
Same-action realizes that camber roll, the striker plate 22 and one are fixed with the reciprocating lever of idler wheel B on the striker plate 22 of ballast slot 13
It is connected, which forms sliding pair with supporting rack A 25, and supporting rack A 25 is fixed on by screw B 24 on pedestal 1, institute
Cam 30 is stated with the motor shaft of motor 26 to be connected.
And pneumatic hammer fuselage 3, motor 26 and ballast slot supporting rack 18 all may be disposed on the pedestal 1, the stone
Quarrel slot 13 is set on the ballast slot supporting rack 18, and ballast slot supporting rack 18 is fixed on by screw A 19 on pedestal 1, stone
Setting triangle floor 20 on quarrel slot supporting rack 18.
The cam 30 for driving striker plate 22 to move is contacted with idler wheel B formation lines when movement, when cam 30 is in rise,
When spring 28 is compressed, the axis due to being fixed with idler wheel B on supporting rack A 25 and shelves flitch 22 forms sliding pair, so striker plate
22 tilt upward to move along fixed angle, and are connected with a pair of of idler wheel A27 by idler wheel A connecting shafts 31 on striker plate 22 so that
Suffered friction smaller when moving of striker plate 22；When cam 30 is in backhaul, spring 28 restores so that striker plate 22 is diagonally downward
Movement；When cam is in far angle of repose, striker plate 22 remains stationary as at contact above retainer 33.
Make counting how many times part firm by ramming：Sensor stand 15 can be also set on ballast slot 13, set on the sensor stand 15
A pair of of laser photoelectricity sensor 14 is set, sensor stand 15 is bolted part B 16 and is fixed on ballast slot 13, described to swash
Light photoelectric sensor 14 is connect with one-chip computer module 17 again, and 17 preferable STC89C51 microcontrollers of one-chip computer module are simultaneously set to
On ballast slot 13, laser photoelectricity sensor 14 acquires 12 exercise data of tamping pick head and acquisition information is transferred to microcontroller mould
Block 17 carries out data processing or display.
Experimental method：
When preparing wear test, testing machine tamping pick head 12 and striker plate 22 are first placed in initial position, started immediately
Gasoline engine 8 makes tamping head first shake, and starts pneumatic hammer power source and motor 26 simultaneously later, when striker plate 22 tilts
When moving up, tamping tool moves down vertically under pneumatic hammer effect, and tup 4 is in fast feed state at this time, and tamping pick head 12 is logical
It is recorded number when crossing laser photoelectric sensor 14, when cam 30 is in far angle of repose, striker plate 22 is in the upper retainer of contact
It is remained stationary as at 33, and tamping pick head 12 contacts rock ballast and starts simulation job, tup 4 is in work feed state at this time, when
When cam is in backhaul, tamping tool moves up vertically under pneumatic hammer effect, and tup 4 is in fast fallback state at this time, and striker plate
22 inclinations, which move down, keeps ballast loose, so that ballast tightness is restored when lower subjob, so just completes once to smash
Gu continue reciprocal experiment, finally record make number firm by ramming after can combine correlation test machine and complete tamping pickaxe worth and wear journey
The research of the contents such as degree and service life.
Experiment can change the tamping pickaxe up and down reciprocatingly vibration frequency of frequency and tamping pick head, to study two kinds of frequencies
The influence that rate wears tamping pick head.
Experiment can change the hardness for fiddling with building stones, particle size, to study the hardness size of building stones to tamping pickaxe pick
The influence of head abrasion.
Different shape, the tamping pick head of unlike material can be used to be tested, analysis, which is made firm by ramming, does pick shape material pair
The influence of abrasion so as to optimization design tamping pick head shape, and is tamping pick head reasonable material.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with it is other
The difference of embodiment, identical similar portion cross-reference between each embodiment.
" one embodiment " for being spoken of in the present specification, " another embodiment ", " embodiment ", etc., refer to tying
Specific features, structure or the feature for closing embodiment description are included at least one embodiment of the application generality description
In.It is not centainly to refer to the same embodiment that statement of the same race, which occur, in multiple places in the description.Appoint furthermore, it is understood that combining
When one embodiment describes a specific features, structure or feature, to be advocated be realized in conjunction with other embodiment it is this
Feature, structure or feature are also fallen in the scope of the utility model.
Although reference be made herein to the utility model is described in multiple explanatory embodiments of the utility model, still,
It should be understood that those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations
It will fall within scope and spirit disclosed in the present application.More specifically, it is disclosed and the scope of the claims in the application
It is interior, a variety of variations and modifications can be carried out to the building block and/or layout of theme combination layout.In addition to building block and/
Or outside the variations and modifications of layout progress, to those skilled in the art, other purposes also will be apparent.
Claims (10)
1. a kind of abrasion tester for making pick firm by ramming, it is characterised in that including pneumatic hammer fuselage (3), tup (4), tamping tool, stone
Be cut slot (13), motor (26), cam (30) and elasticity reset device, and the tup (4) connects with the pneumatic hammer fuselage (3)
It connects, the tamping tool is connect with the tup (4), and the ballast slot (13) is set to below the tamping tool, the ballast slot
(13) movable striker plate (22) is arranged in side, and it is multiple that the elasticity is arranged between the striker plate (22) and the cam (30)
Position device, the cam (30) connect with the motor (26), and the motor (26) drives cam (30) rotation, institute
Stating cam (30) pushes the elasticity reset device and striker plate (22) to do reciprocating.
2. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that the elasticity reset device includes
Reciprocating lever, supporting rack A (25), spring (28) and idler wheel B (29), the idler wheel B (29) for coordinating with the cam (30)
It is set to described reciprocating lever one end, part C (23) and the striker plate (22) outside is bolted in the reciprocating lever other end
Attachment device be connected, the spring (28) is set on the reciprocating lever, described spring (28) one end setting one with it is described
The sliding block of the relatively described reciprocating lever sliding is capable of in the fixed block that reciprocating lever is fixedly connected, spring (28) other end setting one,
The sliding block is fixedly connected with support frame as described above A (25).
3. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that be arranged on the striker plate (22)
Idler wheel A connecting shafts (31), idler wheel A connecting shafts (31) the both ends setting idler wheel A (27), the idler wheel A (27) can be in the stone
It is slided on quarrel slot (13).
4. the abrasion tester according to claim 3 for making pick firm by ramming, it is characterised in that be arranged on the ballast slot (13)
The lower retainer (32) and upper retainer (33) limited for the sliding position to the idler wheel A (27).
5. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that ballast slot (13) lower part is set
Set chip ballast collecting tank (21).
6. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that the tamping tool includes tamping tool
Fuselage (7), gasoline engine (8), power transmission, pick clamping device (11) and tamping pick head (12), the tamping tool machine
Body (7) is fixedly connected with the tup (4), and the gasoline engine (8) is set on the tamping tool fuselage (7), and the power passes
Delivery device is located in the tamping tool fuselage (7) and connects the gasoline engine (8) and the pick clamping device (11), the pick
Head clamping device (11) is connect with the tamping pick head (12).
7. the abrasion tester according to claim 6 for making pick firm by ramming, it is characterised in that the power transmission includes
Worm shaft (36), worm gear (37), bent axle (38), connecting rod (41) and piston (42), the worm shaft (36) and the gasoline engine (8)
Connection, the worm shaft (36) coordinate with the worm gear (37) again, and the worm gear (37) connect with the bent axle (38), the company
Bar (41) is connect with the bent axle (38), and the piston (42) connect with the connecting rod (41), and the piston (42) is located at piston
In cylinder barrel (10), described pick clamping device (11) one end is connect with piston bore (10), and the pick clamping device (11) is another
One end is connect with tamping pick head (12).
8. the abrasion tester according to claim 7 for making pick firm by ramming, it is characterised in that the connecting rod (41) and the song
The junction setting connecting rod bearing shell (40) of axis (38).
9. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that be arranged on the ballast slot (13)
Sensor stand (15), setting laser photoelectricity sensor (14), the laser photoelectricity sensor on the sensor stand (15)
(14) it is connect again with one-chip computer module (17).
10. the abrasion tester according to claim 1 for making pick firm by ramming, it is characterised in that further include pedestal (1) and ballast
Slot supporting rack (18), the pneumatic hammer fuselage (3), motor (26) and ballast slot supporting rack (18) are all set to the pedestal
(1) on, the ballast slot (13) is set on the ballast slot supporting rack (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720743515.XU CN207882098U (en) | 2017-06-22 | 2017-06-22 | Make the abrasion tester of pick firm by ramming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720743515.XU CN207882098U (en) | 2017-06-22 | 2017-06-22 | Make the abrasion tester of pick firm by ramming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207882098U true CN207882098U (en) | 2018-09-18 |
Family
ID=63499916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720743515.XU Expired - Fee Related CN207882098U (en) | 2017-06-22 | 2017-06-22 | Make the abrasion tester of pick firm by ramming |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207882098U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421835A (en) * | 2017-06-22 | 2017-12-01 | 西华大学 | Make the reliability test system of pick firm by ramming |
-
2017
- 2017-06-22 CN CN201720743515.XU patent/CN207882098U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107421835A (en) * | 2017-06-22 | 2017-12-01 | 西华大学 | Make the reliability test system of pick firm by ramming |
| CN107421835B (en) * | 2017-06-22 | 2023-06-02 | 西华大学 | Reliability test system for tamping pick |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180918 Termination date: 20210622 |
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| CF01 | Termination of patent right due to non-payment of annual fee |