CN110878571A - Swing ladder safety control system for electric shovel - Google Patents
Swing ladder safety control system for electric shovel Download PDFInfo
- Publication number
- CN110878571A CN110878571A CN201911280227.5A CN201911280227A CN110878571A CN 110878571 A CN110878571 A CN 110878571A CN 201911280227 A CN201911280227 A CN 201911280227A CN 110878571 A CN110878571 A CN 110878571A
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- ladder
- electromagnetic valve
- swing
- swing ladder
- valve
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- 230000001960 triggered effect Effects 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000003584 silencer Effects 0.000 abstract description 6
- 230000000630 rising effect Effects 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 7
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0833—Improving access, e.g. for maintenance, steps for improving driver's access, handrails
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ladders (AREA)
Abstract
The invention discloses a safety control system of a swing ladder for an electric shovel, which comprises a single-action cylinder, an air path assembly, a mechanical limiter, a controller and an operating piece, wherein the single-action cylinder is arranged on the air path assembly; the head end of a main gas path of the gas path assembly is connected with a gas source, the tail end of the main gas path is communicated with the single-action cylinder, a pressure reducing valve, a first electromagnetic valve, a one-way valve and an emergency release valve are sequentially arranged on the main gas path, the head end of a branch gas path of the gas path assembly enters the main gas path from the position between the one-way valve and the emergency release valve, the tail end of the branch gas path is provided with an adjustable silencer, and; when the operating piece is in a rising position, the first electromagnetic valve is opened, the second electromagnetic valve is closed, the swing ladder rises, when the swing ladder rises to the horizontal position, the mechanical limiter is triggered, the first electromagnetic valve is closed, the swing ladder is locked, when the operating piece is in a falling position, the first electromagnetic valve is closed, the second electromagnetic valve is opened, and the swing ladder falls. The system can realize the lifting of the swing ladder in the cab, has adjustable lifting speed, can rapidly evacuate through the emergency release valve at any time, improves the safety during operation and has low cost.
Description
Technical Field
The invention belongs to the field of mining equipment, and particularly relates to a safety control system of a swing ladder for an electric shovel.
Background
The electric shovel is special excavating equipment for an open mine driven by electric power, the ladder is a necessary component of the electric shovel, and an operator can get on or off the electric shovel equipment only through the ladder. The main structural form of the ladder usually includes a hanging ladder, a telescopic ladder, a folding ladder, a swinging ladder and the like, the existing electric shovel ladder mostly adopts the structural form of the swinging ladder, as shown in fig. 1, a walking board 11 is of a welded frame structure and is arranged on the right side and fixedly connected with an electric shovel platform through bolts, a swinging ladder 12 is hinged with the walking board 11 through a central rotating shaft 13, a cylinder body and a piston rod of a cylinder 14 are respectively hinged with the walking board 11 and the swinging ladder 12, the swinging ladder 12 is driven to swing around the central rotating shaft 13 through the expansion and contraction of the cylinder 14 to realize the lifting function of the ladder, when the cylinder 14 is completely retracted, the swinging ladder 12 inclines about 50 degrees with the ground, the lower end is contacted with the ground, an operator can go up and down the equipment through the swinging ladder 12, and when the cylinder 14 extends out to drive the swinging ladder 12 to ascend until the swinging ladder 12 is.
The current shovel swing ladder has the potential safety hazard, in case the power failure appears, the cylinder damages, gas circuit trouble or electrical system trouble, all can lead to swing ladder unstability, from falling to contact ground at the horizontality rotation in the twinkling of an eye, people, the thing of ladder below cause serious injury, and there is the risk of electrocuteeing, if the shovel is just going on the operation action of gyration this moment, the swing ladder still can directly collide with running gear, cause the ladder, running gear, parts such as platform and electrical components damage, take place serious incident.
Disclosure of Invention
The invention aims to provide a safety control system of a swing ladder for an electric shovel, which can realize the lifting of the swing ladder by operating in a cab, has adjustable lifting speed, can quickly evacuate through an emergency release valve at any time, improves the safety and reliability during operation and has low cost.
The technical scheme adopted by the invention is as follows:
a safety control system of a swing ladder for an electric shovel comprises a single-action air cylinder for driving the swing ladder to lift, an air channel assembly for driving the single-action air cylinder, a mechanical limiter, a controller and an operating piece which is positioned on a cab control panel and is used for controlling the swing ladder to lift; the gas circuit component comprises a main gas circuit and a branch gas circuit, the head end of the main gas circuit is connected with a gas source, the tail end of the main gas circuit is communicated with the single-action cylinder, a pressure reducing valve, a first electromagnetic valve, a one-way valve and an emergency release valve are sequentially arranged on the main gas circuit from the head end to the tail end, the head end of the branch gas circuit enters the main gas circuit from the position between the one-way valve and the emergency release valve, the tail end of the branch gas circuit is provided; when the control piece is located at the ascending position, the controller enables the first electromagnetic valve to be opened and the second electromagnetic valve to be closed, so that the swinging ladder ascends, when the swinging ladder ascends to the level, the mechanical limiter is triggered, the controller enables the first electromagnetic valve to be closed, so that the swinging ladder is locked, and when the control piece is located at the descending position, the controller enables the first electromagnetic valve to be closed and the second electromagnetic valve to be opened, so that the swinging ladder descends.
Furthermore, when the swing ladder swings to the horizontal position, the mechanical limiter is triggered, the first electromagnetic valve is closed through the controller, the swing ladder is locked, and meanwhile the display screen on the cab control panel displays that the swing ladder rises to the position through the controller.
Furthermore, the swing ladder is driven synchronously by two single-acting cylinders, and the two single-acting cylinders share one group of gas circuit components.
Furthermore, a pressure gauge is arranged at the upstream position on the main air path.
Further, an air treatment unit is arranged at the upstream position on the main air path.
Further, the air handling unit is an air filter.
Further, the operating member is a knob.
Further, the first electromagnetic valve and the second electromagnetic valve are both two-position two-way electromagnetic valves.
The invention has the beneficial effects that:
the system can realize the lifting of the swing ladder by operating in a cab and the lifting speed is adjustable, namely when a first electromagnetic valve is opened and a second electromagnetic valve is closed, the swing ladder is lifted and the lifting speed is adjusted by a pressure reducing valve, when the swing ladder is lifted to the horizontal, a mechanical limiter is triggered, the first electromagnetic valve is closed, the swing ladder is suspended and locked under the combined action of system pressure and a one-way valve, when the first electromagnetic valve is closed and the second electromagnetic valve is opened, air in a single-acting cylinder is released to the atmosphere through the second electromagnetic valve and an adjustable silencer, the swing ladder continuously descends under the combined action of gravity and pneumatic control pressure, and the descending speed is adjusted by the opening degree of a throttling hole of the adjustable silencer;
the system can remotely control the swing ladder to lift in the cab, is convenient and reliable to operate, reduces the labor intensity of operators, and does not cause unnecessary damage to the operators; when unpredictable events such as cylinder damage, gas circuit failure, electrical failure or fire disaster occur, the operator does not need to return to the cab, the emergency release valve can be opened at any time, the swing ladder quickly descends to the ground, the electric shovel equipment is quickly evacuated, and the personal safety of the operator is protected to the greatest extent; experiments prove that the system greatly improves the safety and reliability of the electric shovel during operation.
The system can fully utilize the existing pneumatic system in the electric shovel as a power source, and is locally additionally improved, so that the cost is low.
Drawings
FIG. 1 is a schematic structural view of an electric shovel swing ladder;
in the figure: 11-right side walking board; 12-a swing ladder; 13-a central rotating shaft; 14-cylinder.
FIG. 2 is a schematic diagram of an air circuit assembly of a swing ladder safety control system for an electric shovel in an embodiment of the present invention;
in the figure: 21-pressure gauge; 22-a pressure relief valve; 23-an air handling unit; 24-a first electromagnetic valve; 25-a one-way valve; 26-a second electromagnetic valve; 27-an emergency release valve; 28-single acting cylinder; 29-tunable silencer.
Detailed Description
The invention is further described below with reference to the figures and examples.
A safety control system of a swing ladder for an electric shovel comprises a single-action cylinder 28 for driving the swing ladder to lift, a gas circuit assembly for driving the single-action cylinder 28, a mechanical limiter, a controller and an operating piece which is positioned on a cab control panel and is used for controlling the swing ladder to lift; as shown in fig. 2, the gas path assembly comprises a main gas path and a branch gas path, the head end of the main gas path is connected with a gas source, the tail end of the main gas path is communicated with a single-acting cylinder 28, a pressure reducing valve 22, a first electromagnetic valve 24, a one-way valve 25 and an emergency release valve 27 are sequentially arranged on the main gas path from the head end to the tail end, the head end of the branch gas path enters the main gas path from the position between the one-way valve 25 and the emergency release valve 27, the tail end of the branch gas path is provided; when the control piece is in the ascending position, the controller enables the first electromagnetic valve 24 to be opened and the second electromagnetic valve 26 to be closed, the swinging ladder is lifted, when the swinging ladder is lifted to be horizontal, the mechanical limiter is triggered, the first electromagnetic valve 24 is closed through the controller, the swinging ladder is locked, and when the control piece is in the descending position, the first electromagnetic valve 24 is closed through the controller, the second electromagnetic valve 26 is opened through the controller, and the swinging ladder is descended.
The system can realize the lifting of the swing ladder by operating in a cab and the lifting speed is adjustable, namely when a first electromagnetic valve 24 is opened and a second electromagnetic valve 26 is closed, the swing ladder is lifted and the lifting speed is adjusted by a pressure reducing valve 22, when the swing ladder is lifted to the horizontal, a mechanical limiter is triggered, the first electromagnetic valve 24 is closed, the swing ladder is hovered and locked under the combined action of system pressure and a one-way valve 25, when the first electromagnetic valve 24 is closed and the second electromagnetic valve 26 is opened, air in a single-acting air cylinder 28 is released to the atmosphere through the second electromagnetic valve 26 and an adjustable silencer 29, the swing ladder continuously descends under the combined action of gravity and pneumatic control pressure, and the descending speed is adjusted by the opening degree of a throttling hole of the adjustable silencer 29; the system can remotely control the swing ladder to lift in the cab, is convenient and reliable to operate, reduces the labor intensity of operators, and does not cause unnecessary damage to the operators; when unpredictable events such as cylinder damage, gas circuit failure, electrical failure or fire occur, the operator does not need to return to the cab, the emergency release valve 27 can be opened at any time, the swing ladder quickly descends to the ground, the electric shovel equipment is quickly evacuated, and the personal safety of the operator is protected to the greatest extent; tests prove that the system greatly improves the safety and reliability of the electric shovel during operation; the system can fully utilize the existing pneumatic system in the electric shovel as a power source, and is locally additionally improved, so that the cost is low.
In this embodiment, when the swing ladder swings to the horizontal position, the mechanical limiter is triggered, the controller enables the first electromagnetic valve 24 to be closed, the swing ladder is locked, meanwhile, the controller enables the display screen on the cab control panel to display that the swing ladder rises in place, and the rear equipment operation is conveniently executed.
As shown in fig. 2, in this embodiment the escalator is driven synchronously by two single-acting cylinders 28, the two single-acting cylinders 28 sharing a set of air path assemblies.
As shown in fig. 2, in the present embodiment, a pressure gauge 21 and an air handling unit 23 (e.g., an air filter) are further provided at an upstream position on the main air path.
In the present embodiment, the operating member is a knob, but may be a lever.
In this embodiment, the first solenoid valve 24 and the second solenoid valve 26 are two-position two-way solenoid valves.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides an electric shovel is with swing ladder safety control system which characterized in that: the device comprises a single-action cylinder for driving the swing ladder to lift, a gas circuit assembly for driving the single-action cylinder, a mechanical limiter, a controller and an operating piece which is positioned on a cab control panel and is used for controlling the swing ladder to lift; the gas circuit component comprises a main gas circuit and a branch gas circuit, the head end of the main gas circuit is connected with a gas source, the tail end of the main gas circuit is communicated with the single-action cylinder, a pressure reducing valve, a first electromagnetic valve, a one-way valve and an emergency release valve are sequentially arranged on the main gas circuit from the head end to the tail end, the head end of the branch gas circuit enters the main gas circuit from the position between the one-way valve and the emergency release valve, the tail end of the branch gas circuit is provided; when the control piece is located at the ascending position, the controller enables the first electromagnetic valve to be opened and the second electromagnetic valve to be closed, so that the swinging ladder ascends, when the swinging ladder ascends to the level, the mechanical limiter is triggered, the controller enables the first electromagnetic valve to be closed, so that the swinging ladder is locked, and when the control piece is located at the descending position, the controller enables the first electromagnetic valve to be closed and the second electromagnetic valve to be opened, so that the swinging ladder descends.
2. The swing ladder safety control system for an electric shovel of claim 1, wherein: when the swing ladder swings to the horizontal position, the mechanical limiter is triggered, the first electromagnetic valve is closed through the controller, the swing ladder is locked, and meanwhile, the controller enables the display screen on the cab control panel to display that the swing ladder rises in place.
3. The swing ladder safety control system for an electric shovel of claim 1, wherein: the swing ladder is driven by two single-acting cylinders synchronously, and the two single-acting cylinders share one group of gas circuit components.
4. The swing ladder safety control system for an electric shovel of claim 1, wherein: and a pressure gauge is arranged at the upstream position on the main air path.
5. The swing ladder safety control system for an electric shovel of claim 1, wherein: an air treatment unit is arranged at the upstream position on the main air path.
6. The swing ladder safety control system for electric shovel of claim 5, characterized in that: the air handling unit is an air filter.
7. The swing ladder safety control system for an electric shovel of claim 1, wherein: the operating member is a knob.
8. The swing ladder safety control system for an electric shovel of claim 1, wherein: the first electromagnetic valve and the second electromagnetic valve are both two-position two-way electromagnetic valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280227.5A CN110878571A (en) | 2019-12-13 | 2019-12-13 | Swing ladder safety control system for electric shovel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911280227.5A CN110878571A (en) | 2019-12-13 | 2019-12-13 | Swing ladder safety control system for electric shovel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110878571A true CN110878571A (en) | 2020-03-13 |
Family
ID=69731578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911280227.5A Pending CN110878571A (en) | 2019-12-13 | 2019-12-13 | Swing ladder safety control system for electric shovel |
Country Status (1)
| Country | Link |
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| CN (1) | CN110878571A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6279315B1 (en) * | 1996-04-01 | 2001-08-28 | Safe Net I Harads Ab | Pneumatic unlocking and closing apparatus |
| JP2016074326A (en) * | 2014-10-07 | 2016-05-12 | 株式会社タダノ | Working vehicle |
| KR20160068355A (en) * | 2014-12-05 | 2016-06-15 | 평화산업 (주) | Working platform towed by tractor for fruit tree work |
| CN208293647U (en) * | 2018-05-02 | 2018-12-28 | 中铁工程机械研究设计院有限公司 | Electrohydraulic push rod formula power shovel airstair apparatus for automatically lifting |
| JP2019019448A (en) * | 2017-07-11 | 2019-02-07 | 日立建機株式会社 | Lifting device of construction machinery |
| CN110206769A (en) * | 2019-06-06 | 2019-09-06 | 徐州徐工筑路机械有限公司 | The hydraulic overturning ladder of one kind and control method |
| CN211472668U (en) * | 2019-12-13 | 2020-09-11 | 中铁工程机械研究设计院有限公司 | Swing ladder safety control system for electric shovel |
-
2019
- 2019-12-13 CN CN201911280227.5A patent/CN110878571A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6279315B1 (en) * | 1996-04-01 | 2001-08-28 | Safe Net I Harads Ab | Pneumatic unlocking and closing apparatus |
| JP2016074326A (en) * | 2014-10-07 | 2016-05-12 | 株式会社タダノ | Working vehicle |
| KR20160068355A (en) * | 2014-12-05 | 2016-06-15 | 평화산업 (주) | Working platform towed by tractor for fruit tree work |
| JP2019019448A (en) * | 2017-07-11 | 2019-02-07 | 日立建機株式会社 | Lifting device of construction machinery |
| CN208293647U (en) * | 2018-05-02 | 2018-12-28 | 中铁工程机械研究设计院有限公司 | Electrohydraulic push rod formula power shovel airstair apparatus for automatically lifting |
| CN110206769A (en) * | 2019-06-06 | 2019-09-06 | 徐州徐工筑路机械有限公司 | The hydraulic overturning ladder of one kind and control method |
| CN211472668U (en) * | 2019-12-13 | 2020-09-11 | 中铁工程机械研究设计院有限公司 | Swing ladder safety control system for electric shovel |
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