CN108222993A - Horizontal shaft type vehicle-mounted temporary support device for development machine - Google Patents
Horizontal shaft type vehicle-mounted temporary support device for development machine Download PDFInfo
- Publication number
- CN108222993A CN108222993A CN201810215385.1A CN201810215385A CN108222993A CN 108222993 A CN108222993 A CN 108222993A CN 201810215385 A CN201810215385 A CN 201810215385A CN 108222993 A CN108222993 A CN 108222993A
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- CN
- China
- Prior art keywords
- oil cylinder
- development machine
- station
- support device
- horizontal shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000009434 installation Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 241000153246 Anteros Species 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/04—Safety devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
Abstract
The invention discloses horizontal shaft type vehicle-mounted temporary support device for development machine, including main branch overhead guard, set of standing, stand pipe, oscillating oil cylinder, telescopic oil cylinder, support cylinder, there are two crossheads for the monosymmetric installation of branch overhead guard, the branch overhead guard is connect by the oil cylinder that protracts with extension upper frame, the crosshead positioned at homonymy is hinged respectively at station pipe and support cylinder, the station pipe sleeve is connected in the set of station and is driven by telescopic oil cylinder, the support cylinder other end is hinged on station set end side, and station set bottom is hinged by supporting front axle with main carriage；Compared with prior art, horizontal shaft type vehicle-mounted temporary support device for development machine of the invention, can axis connection or so main carriage before and after realization entirety, globality is strong, and integral runners can be moved forward and backward, and for set of standing for external connection ear structure, upper frame being capable of integral telescopic.
Description
Technical field
The present invention relates to colliery tunnel support apparatus fields, are specifically exactly horizontal shaft type development machine piggyback temporary support dress
It puts.
Background technology
It manually being altered present in pipe front canopy support during to solve the disadvantage that traditional coal mine roadway opening, improving comprehensive digging equipment
Degree realizes the piercing technique of quick safety, now mostly using piggyback temporary support device, safety is realized to empty top zone, can
It leans on, quick support process.
But existing piggyback temporary support device is also there are many drawbacks, such as the interim branch in patent CN202832541
Protection unit, complicated, flexibility and poor reliability are only applicable to longitudinal axis development machine, and horizontal shaft type development machine does not have longitudinal axis formula
All piggyback temporary support device for mechanical structures can only be mounted on development machine protecting cover by the so-called antero posterior axis of development machine.Cause
Before this fixation hinge joint for being badly in need of a kind of piggyback temporary support device of integral installation on development machine protecting cover is designed as monoblock type
The temporary support device of rear axle.
Invention content
The purpose of the present invention is to provide horizontal shaft type vehicle-mounted temporary support device for development machine, which can realize with whole
Axis connection or so main carriage before and after body, globality is strong, and integral runners can be moved forward and backward, and set of standing is external connection ear structure, upper frame
It being capable of integral telescopic.
The technical scheme adopted by the invention to solve the technical problem is that：Horizontal shaft type vehicle-mounted temporary support device for development machine,
Including main branch overhead guard, set of standing, stand pipe, oscillating oil cylinder, telescopic oil cylinder, support cylinder, the branch overhead guard is monosymmetric
There are two crossheads for installation, and the branch overhead guard is connect by the oil cylinder that protracts with extension upper frame, positioned at the cross of homonymy
Head is hinged respectively at station pipe and support cylinder, and the station pipe sleeve is connected in the set of station and is driven by telescopic oil cylinder, support oil
The cylinder other end is hinged on station set end side, and station set bottom is hinged by supporting front axle with main carriage, station set
Side is equipped with connecting plate, and both ends are separately installed with supporting front axle and supporting rear axle, the supporting at the top of the main carriage
Rear axle both ends are hinged with oscillating oil cylinder, and the oscillating oil cylinder other end is hinged with connecting plate, and the main carriage is slidably installed
In fixed main skid, slideway oil cylinder is installed, the slideway oil cylinder is connect with main carriage in the fixation main skid.
As an optimization, securing plate between the fixation main skid is installed, fixation is installed at the top of the main carriage
Device, the fixed seat that the fixing device is symmetrically installed by two pieces form, be equipped in the fixed seat supporting front axle and
Supporting rear axle, shaft length, which is more than, after the supporting front axle and supporting reinforces version, and the main carriage is close to the one of slideway oil cylinder
End is provided with sealing plate.
As an optimization, the crosshead length being connect with station pipe is more than the crosshead being connect with support cylinder.
As an optimization, the main branch overhead guard is fixed integrally in frame structure including connector, bracing means, body frame
Pipe, the connector are symmetrically mounted on main branch overhead guard both sides, and the connector bottom is equipped with crosshead, frame structure
Middle junction is provided with bracing means, and the body frame fixing pipe is fixedly connected with extension oil cylinder.
As an optimization, the extension upper frame is integrally in frame structure, including extension upper frame supervisor, magnetic box, crossbeam, institute
The extension upper frame edge stated is provided with magnetic box, and extension upper frame supervisor installs with beam vertical, the extension top
Frame is responsible for is provided with bracing means with crossbeam junction.
As an optimization, extension upper frame supervisor is socketed in crossbeam.
As an optimization, the station, which covers one end and is provided with the closure other end, is provided with connecting portion, close to the connecting portion
End side connecting plate is installed.
The beneficial effects of the invention are as follows：Compared with prior art, horizontal shaft type development machine piggyback temporary support of the invention dress
The fixation hinge joint for putting the suspension device on development machine protecting cover is designed as monoblock type antero posterior axis, ensure that the concentric of left and right hinge joint
Degree, left and right main carriage is attached with whole antero posterior axis, left and right main carriage can not only be connected into the entirety of a high rigidity, but also protect
The intensity as hinge joint is demonstrate,proved；Piggyback temporary support device can exceed development machine as possible in use, integral runners forward movement
Cutterhead, when development machine works, integral runners move backward, and can reduce the interference to development machine to the greatest extent；Set stand as external even ear
Structure,, will so as to make full use of space by the way that each hinge joint of supporting four-bar mechanism is changed to stereo staggered by plane superposition
Overall structure reduced height；Upper frame is designed as whole structure of protracting, and compared with commonly extension upper frame, expands working face forepart
Supporting area, improves security protection, during convenient for supporting construction, carries out steel band and anchor net is fixed and front and back position adjustment.
Description of the drawings
Fig. 1 is main structure figure of the present invention；
Fig. 2 is overlooking structure figure of the present invention；
Fig. 3 is collapsed state main view enlarged drawing of the present invention；
Fig. 4 is the main branch overhead guard top perspective view of the present invention；
Fig. 5 is the A of Fig. 4 of the present invention to partial view；
Fig. 6 is present invention extension upper frame top perspective view；
Fig. 7 is the B of Fig. 6 of the present invention to partial view；
Fig. 8 covers main view enlarged drawing for present invention station；
Fig. 9 is the sectional structure chart of Fig. 8 of the present invention；
Figure 10 is the C-C sectional views of Fig. 9 of the present invention；
Figure 11 is main carriage section view amplification assumption diagram of the present invention；
Wherein, the 1 main extension of branch overhead guard 1,2 upper frame 2,3 crossheads 3,4 stations cover 4,5 station pipes 5,6 connecting plates 6,7 oscillating oil cylinders 7,8
Telescopic oil cylinder 8,9 support cylinders 9,10 extension oil cylinder 10,11 supporting front axles 11,12 supporting rear axles 12,13 fix main skid 13,14
Main carriage 14,15 slideway oil cylinders 15；
101 connectors, 102 bracing means, 103 body frame fixing pipes；
201 extension upper frame supervisors, 202 magnetic box, 203 crossbeams；
401 closures, 402 connecting portions；
1401 fixed seats, 1402 sealing plates.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be configured to arrange and design with a variety of different.Therefore, below to provide in the accompanying drawings the present invention reality
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of the selected implementation of the present invention
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall within the protection scope of the present invention.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need to that it is further defined and explained in subsequent attached drawing.
As shown in Figs. 1-2 in embodiment, horizontal shaft type vehicle-mounted temporary support device for development machine, including main branch overhead guard 1, set of standing
4th, it stands pipe 5, oscillating oil cylinder 7, telescopic oil cylinder 8, support cylinder 9, there are two crosses for the 1 monosymmetric installation of branch overhead guard
First 3, the branch overhead guard 1 by protract oil cylinder 10 with extension upper frame 2 connect, positioned at homonymy the crosshead 3 respectively at
Standing, pipe 5 and support cylinder 9 are hinged, and the station pipe 5 is socketed in station set 4 and is driven by telescopic oil cylinder 8, the support cylinder 9
The other end is hinged on station 4 end sides of set, and the station covers 4 bottoms and is hinged by supporting front axle 11 and main carriage 14, described
Stand set 4 sides connecting plate 6 is installed, the 14 top both ends of main carriage are separately installed with supporting front axle 11 and supporting rear axle
12,12 both ends of supporting rear axle are hinged with oscillating oil cylinder 7, and 7 other end of oscillating oil cylinder is hinged with connecting plate 6, institute
The main carriage 14 stated is slidably mounted in fixed main skid 13, and slideway oil cylinder 15, institute are equipped in the fixation main skid 13
The slideway oil cylinder 15 stated is connect with main carriage 14.
In specific implementation process, slideway oil cylinder 15 says that main carriage 14 is whole and releases that oscillating oil cylinder 7 extends control station set 4
It being rotated clockwise around supporting front axle 11, the elongation of support cylinder 9 control upper frame 1 keeps horizontality while oscillating oil cylinder 7 extends,
Until oscillating oil cylinder 7 and support cylinder 9 are extended to being fully deployed.Then the elongation of telescopic oil cylinder 8 drives station pipe 5, support cylinder 9 same
When along station set upward sliding, after development machine is equipped with piggyback temporary support device, piggyback temporary support device is in use, operating attitude
Should be more than the cutterhead of development machine as possible, to provide larger working space for worker；When development machine works, piggyback temporary support
Device should collapse minimum posture as possible, to reduce the influence to work development machine.The main carriage 14 of piggyback temporary support device
It is designed to be moved forward and backward along fixed main skid 13, exactly in order to meet above-mentioned requirements.Piggyback temporary support device is in use, main
Balladeur train 13 moves forward, and can exceed cutting head of roadheader as possible；When development machine works, main carriage 13 moves backward, and can subtract as possible
Few interference to development machine.The length mounted on main carriage 14 top shield rear axle 12 parallel with supporting front axle 11 of supporting rear axle 12
Degree is more than supporting front axle 11, and 12 both ends of supporting rear axle are hinged oscillating oil cylinder 7, and 7 other end of oscillating oil cylinder is hinged with connecting plate 6, branch
Shield front axle 11 both ends are hingedly stood set 4, from vertical view（Fig. 2）It can be seen that the side of station set 4 is installed with connecting plate 6, stand
Set 4 is arranged on 7 inside of oscillating oil cylinder, and such setting ensure that the concentric of 11 or so hinge joint of supporting rear axle 12 and supporting front axle
Degree.Main carriage 14 is attached with whole antero posterior axis, the main carriage 14 of both sides can not only be connected into the entirety of a high rigidity, but also
It ensure that the intensity as hinge joint.
In embodiment as shown in Figure 3,4 outside setting connecting plate 6 of pipe of standing, when not in use, stretch suspension device oil first
Cylinder 8 shrinks support cylinder 9 and station pipe 5 and top section entire lowering, and oscillating oil cylinder 7 and support cylinder 9 be simultaneously after decline
It shrinks, branch overhead guard 1 rotates counterclockwise around crosshead 3 and station 5 hinged place of pipe at this time, and set 4 of standing turns counterclockwise around supporting front axle 11
It is dynamic, due to 7 inside setting station pipe 4 of oscillating oil cylinder, can staggeredly be stored with oscillating oil cylinder 7 after pipe 4 of standing rotation, and make full use of sky
Between, by overall structure reduced height, therefore occupy little space after suspension device is packed up as shown in Fig. 3.
In embodiment as shown in figs. 4-7, main 1 function of branch overhead guard of piggyback temporary support device is, support steel band and
Anchor net, and top plate is supported, play gib function.Main branch overhead guard 1 is designed as whole structure of protracting.The structure has
There is advantage：
1. compared with commonly extension upper frame, the supporting area of working face forepart is expanded, improves security protection.
2. it during convenient for supporting construction, carries out steel band and anchor net is fixed and front and back position adjustment.It commonly protracts main supporting top
During 1 supporting construction of frame, extension upper frame need to be first stretched out, could carry out being laid with steel band and anchor net, reaching top plate needs front and rear adjustment position
When, since extension oil cylinder cannot stretch again, angling cylinder can only be operated and support oil cylinder that could adjust front and back position, it is very not square
Just.Whole extension upper frame can first set steel band and anchor net laying fixed on extension upper frame, when being raised to top plate, can be stretched by upper frame
Oil cylinder easily adjusts front and back position.
Main branch overhead guard 1 is whole in frame structure, including connector 101, bracing means 102, body frame fixing pipe 103, connects
It connects device 101 and is symmetrically mounted on main 1 both sides of branch overhead guard, 101 bottom of connector is equipped with crosshead 3, junction in frame structure
Bracing means 102 is provided with, body frame fixing pipe 103 is fixedly connected with extension oil cylinder 10.The whole upper frame 2 that protracts is in frame structure,
Including extension upper frame supervisor 201, magnetic box 202, crossbeam 203,2 edge of extension upper frame is provided with magnetic box 202, and protract upper frame
Supervisor 201 and 203 right angle setting of crossbeam, extension upper frame supervisor 201 are provided with bracing means 102 with 203 junction of crossbeam, protract
Upper frame supervisor 201 is socketed in crossbeam 203, stabilized structure.Pass through the oil cylinder 10 that protracts between main branch overhead guard 1 and extension upper frame 2
Connection is realized extension 2 morning of upper frame extension and is shunk.
In embodiment as seen in figs. 8-10, the setting of connecting plate 6 station 4 sides far from supporting front axle 11 of set.It stands and covers 4 one end
It is provided with 401 other end of closure and is provided with connecting portion 402, connecting plate is installed close to the end side of the connecting portion 402
6。
In embodiment as shown in figure 11, securing plate is installed between fixed main skid 13,14 top of main carriage is equipped with
Fixing device, fixing device are made of two pieces of fixed seats being symmetrically installed 1401, and supporting front axle 11 is equipped in fixed seat 1401
With supporting rear axle 12, supporting front axle 11 and 12 length of supporting rear axle are more than reinforcing version, and main carriage 14 is close to the one of slideway oil cylinder 15
End is provided with sealing plate 1402.
Above-mentioned specific embodiment is only the specific case of the present invention, and scope of patent protection of the invention includes but not limited to
The product form and style of above-mentioned specific embodiment, any horizontal shaft type development machine for meeting claims of the present invention is airborne to be faced
When suspension device and any person of an ordinary skill in the technical field appropriate variation or modification done to it, should all fall into this
The scope of patent protection of invention.
Claims (7)
1. horizontal shaft type vehicle-mounted temporary support device for development machine, including main branch overhead guard（1）, set of standing（4）, pipe of standing（5）, oscillating oil cylinder
（7）, telescopic oil cylinder（8）, support cylinder（9）, it is characterised in that：The branch overhead guard（1）There are two monosymmetric installations
Crosshead（3）, the branch overhead guard（1）Pass through the oil cylinder that protracts（10）With the upper frame that protracts（2）Connection, positioned at described the ten of homonymy
Prefix（3）It is managed respectively at station（5）And support cylinder（9）Hinged, described station pipe（5）It is socketed in station set（4）It is interior by telescopic oil cylinder
（8）Driving, the support cylinder（9）The other end is hinged on station set（4）End side, station set（4）Bottom passes through branch
Protect front axle（11）With main carriage（14）Hinged, described station set（4）Side is equipped with connecting plate（6）, the main carriage（14）
Top both ends are separately installed with supporting front axle（11）With supporting rear axle（12）, the supporting rear axle（12）Both ends and oscillating oil cylinder
（7）Hinged, described oscillating oil cylinder（7）The other end and connecting plate（6）Hinged, described main carriage（14）It is slidably mounted on fixation
Main skid（13）Interior, described fixation main skid（13）Slideway oil cylinder is inside installed（15）, the slideway oil cylinder（15）With master
Balladeur train（14）Connection.
2. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 1, it is characterised in that：The fixed master
Slideway（13）Between securing plate, the main carriage are installed（14）Top is equipped with fixing device, the fixing device by
Two pieces of fixed seats being symmetrically installed（1401）Composition, the fixed seat（1401）Supporting front axle is inside installed（11）After supporting
Axis（12）, the supporting front axle（11）With supporting rear axle（12）Length, which is more than, reinforces version, the main carriage（14）Close to sliding
Road oil cylinder（15）One end be provided with sealing plate（1402）.
3. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 1, it is characterised in that：It is managed with station（5）Even
The crosshead connect（3）Length is more than and support cylinder（9）The crosshead of connection（3）.
4. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 1, it is characterised in that：The main supporting
Upper frame（1）Whole is in frame structure, including connector（101）, bracing means（102）, body frame fixing pipe（103）, the company
Connect device（101）It is symmetrically mounted on main branch overhead guard（1）Both sides, the connector（101）Bottom is equipped with crosshead（3）, frame
Junction is provided with bracing means in frame structure（102）, the body frame fixing pipe（103）With the oil cylinder that protracts（10）It is fixed to connect
It connects.
5. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 1, it is characterised in that：The extension top
Frame（2）Whole is in frame structure, including extension upper frame supervisor（201）, magnetic box（202）, crossbeam（203）, the extension top
Frame（2）Edge is provided with magnetic box（202）, described extension upper frame supervisor（201）With crossbeam（203）Right angle setting, it is described
Extension upper frame supervisor（201）With crossbeam（203）Junction is provided with bracing means（102）.
6. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 5, it is characterised in that：The extension top
Frame is responsible for（201）It is socketed in crossbeam（203）It is interior.
7. horizontal shaft type vehicle-mounted temporary support device for development machine according to claim 1, it is characterised in that：The station set
（4）One end is provided with closure（401）The other end is provided with connecting portion（402）, close to the connecting portion（402）End side
Connecting plate is installed（6）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810215385.1A CN108222993A (en) | 2018-03-15 | 2018-03-15 | Horizontal shaft type vehicle-mounted temporary support device for development machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810215385.1A CN108222993A (en) | 2018-03-15 | 2018-03-15 | Horizontal shaft type vehicle-mounted temporary support device for development machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108222993A true CN108222993A (en) | 2018-06-29 |
Family
ID=62659496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810215385.1A Pending CN108222993A (en) | 2018-03-15 | 2018-03-15 | Horizontal shaft type vehicle-mounted temporary support device for development machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108222993A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3561221A (en) * | 1968-10-23 | 1971-02-09 | Hemscheidt Maschf Hermann | Roof-supporting assemblies |
| CN2613592Y (en) * | 2003-03-14 | 2004-04-28 | 煤炭科学研究总院南京研究所 | Machine carried temporary support for coal mine tunnel |
| CN202832541U (en) * | 2012-10-12 | 2013-03-27 | 邹城兖矿泰德工贸有限公司 | Onboard temporary supporting device |
| CN205840903U (en) * | 2016-07-25 | 2016-12-28 | 济宁亨瑞达机电设备有限公司 | Temporary support device is visited before a kind of overlength |
| CN206016841U (en) * | 2016-09-19 | 2017-03-15 | 田胜利 | Development machine temporary support device |
| CN207960657U (en) * | 2018-03-15 | 2018-10-12 | 邹城兖矿泰德工贸有限公司 | Horizontal shaft type vehicle-mounted temporary support device for development machine |
-
2018
- 2018-03-15 CN CN201810215385.1A patent/CN108222993A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3561221A (en) * | 1968-10-23 | 1971-02-09 | Hemscheidt Maschf Hermann | Roof-supporting assemblies |
| CN2613592Y (en) * | 2003-03-14 | 2004-04-28 | 煤炭科学研究总院南京研究所 | Machine carried temporary support for coal mine tunnel |
| CN202832541U (en) * | 2012-10-12 | 2013-03-27 | 邹城兖矿泰德工贸有限公司 | Onboard temporary supporting device |
| CN205840903U (en) * | 2016-07-25 | 2016-12-28 | 济宁亨瑞达机电设备有限公司 | Temporary support device is visited before a kind of overlength |
| CN206016841U (en) * | 2016-09-19 | 2017-03-15 | 田胜利 | Development machine temporary support device |
| CN207960657U (en) * | 2018-03-15 | 2018-10-12 | 邹城兖矿泰德工贸有限公司 | Horizontal shaft type vehicle-mounted temporary support device for development machine |
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