CN103867876B - A kind of building hoist lubricating oil spray equipment - Google Patents
A kind of building hoist lubricating oil spray equipment Download PDFInfo
- Publication number
- CN103867876B CN103867876B CN201410105569.4A CN201410105569A CN103867876B CN 103867876 B CN103867876 B CN 103867876B CN 201410105569 A CN201410105569 A CN 201410105569A CN 103867876 B CN103867876 B CN 103867876B
- Authority
- CN
- China
- Prior art keywords
- oil
- building hoist
- gear
- injection pump
- lubricating oil
- 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.)
- Expired - Fee Related
Links
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 35
- 239000007921 spray Substances 0.000 title claims abstract description 23
- 239000003921 oil Substances 0.000 claims abstract description 107
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 33
- 239000000446 fuel Substances 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 6
- 230000000750 progressive effect Effects 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 2
- 239000002828 fuel tank Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Abstract
The present invention relates to building hoist technical field, more particularly to a kind of building hoist lubricating oil spray equipment, it includes fuel reserve tank, for engaging the gear of construction elevator rack, gear reducer, oil cylinder, the injection pump of adjustable distributive value.In the use of the present invention, engaged by gear with the rack of building hoist, there is provided power, without special configuration motor, therefore, present invention manufacture cost is low, simple in structure；Moreover, limitation of the present invention by the first unilateral bearing, makes building hoist only when declining, gear could drive gear reducer by shaft, device is worked, so as to will not additionally increase the line load of building hoist；Further, the present invention is using the injection pump for adjusting distributive value, so as to adjust each distributive value size according to actual needs so that operate with extremely convenient.
Description
Technical field
The present invention relates to building hoist technical field, more particularly to a kind of building hoist lubricating oil spray equipment.
Background technology
In skyscraper building site, it will usually be provided with building hoist.General building hoist is by carriage, driving machine
A few part compositions such as structure, standard knot, attached wall, chassis, fence, electrical system.It is to be attached to outside one kind in construction main body
Use carriage（Also known as, work cage）Make along track mast frame vertical（Or tilt）Move up and down, relatively large applied for manned, loading
Work machinery.
Wherein, it is the normal operation of guarantee building hoist, it is often necessary to which the track and rack of track mast frame are mended
Oil lubrication.Traditional way is：Manipulate worker and climb up car roof, artificial brushing lubricating oil or play butter, it is evident that is this to do
Method, painting efficiency is relatively low, brushes uneven, dangerous to manipulate worker greatly and easily fall, generation worker's casualty accident.
In addition, there are some producers to devise building hoist lubricating oil spray equipment.But these building hoists lubricate
Most of oily spray equipment needs to configure special motor, and to drive injection pump to spray lubricating oil, manufacture cost is higher, and structure is multiple
It is miscellaneous；In addition, its injection pump cannot adjust each distributive value size, spraying grease can only be pinpointed, operates with inconvenience.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art and provide that a kind of manufacture cost is low, simple in structure, operation
Building hoist lubricating oil spray equipment easy to use.
To achieve these goals, the present invention provides a kind of building hoist lubricating oil spray equipment, including fuel reserve tank, uses
In the gear of engagement construction elevator rack, gear reducer, oil cylinder, the injection pump of adjustable distributive value；It is provided with the gear
Rotation axis, the gear are sequentially connected by the input shaft of rotation axis and the gear reducer, and the gear is single by first
It is sequentially connected to bearing and the rotation axis, the rotation axis is passed by the input shaft of the second unilateral bearing and the gear reducer
Dynamic connection, the input shaft that the gear reducer can be driven by making the gear rotate；The oil cylinder is located at the bottom of the fuel reserve tank, and
The oil cylinder is connected with the fuel reserve tank；The injection pump is located in the oil cylinder, the output shaft of the gear reducer and the spray
Oil pump transmission connects, and the gear reducer is driven the injection pump oil spout.
Wherein, the injection pump includes oil pump housing, the piston moved back and forth being arranged in the oil pump housing, uses
In the shifting block for driving the piston；The shifting block is fixed on the top of the piston, and the top middle portion of the oil pump housing is opened
Equipped with the straight slot for protruding and moving for the shifting block, the output shaft of the gear reducer is provided with for stirring the convex of the shifting block
Block；The front portion of the oil pump housing is provided with oil inlet area, and the top in the oil inlet area offers fuel feed hole, before the oil pump housing
End is provided with atomizer, and check valve is provided between the oil inlet area and atomizer；Outer spiral shell is provided with the outside of the check valve
Line, is provided with and the matched internal thread of the external screw thread of the check valve in the oil pump housing.
Wherein, the rear end of the oil pump housing is threaded with adjusting screw, is set between the adjusting screw and piston
There is spring, the spring one end props up the adjusting screw, and the spring other end is fixed by socket in the rear end of the piston.
Wherein, the atomizer of the injection pump protrudes from the front side of the oil cylinder.
Wherein, the adjusting screw protrudes from the rear side of the oil cylinder.
Wherein, progressive separator is further included, the oil inlet of the progressive separator passes through oil pipe and the injection pump
Atomizer connection.
Wherein, the progressive separator is provided with 8 oil outlets.
Wherein, case lid is provided with the top of the fuel reserve tank, the case lid is provided with handle.
Wherein, the bottom of the fuel reserve tank, the top of oil cylinder offer the through hole to circulate for lubricating oil, and the oil
Transparent observing window is provided with the outside of cylinder.
Beneficial effect of the present invention is：
In the use of the present invention, engaged by gear with the rack of building hoist, there is provided power, without special configuration electricity
Machine, therefore, present invention manufacture cost are low, simple in structure；Moreover, the present invention makes construction liter by the limitation of the first unilateral bearing
For drop machine only when declining, gear could drive gear reducer by shaft, device is worked, and be risen so as to will not additionally increase construction
The line load of drop machine；Further, the present invention is using the injection pump for adjusting distributive value, so as to be adjusted according to actual needs
Save each distributive value size so that operate with extremely convenient.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the structure diagram at another visual angle of the present invention.
Fig. 3 is the structure diagram when present invention conceals fuel reserve tank and progressive separator.
Fig. 4 is structure diagram when Fig. 3 conceals oil cylinder.
Fig. 5 is the diagrammatic cross-section of the injection pump of the present invention.
Fig. 6 is the decomposition diagram of the injection pump of the present invention.
Fig. 7 is the structure diagram of the gear reducer of the present invention.
Include in Fig. 1~7：
1 --- fuel reserve tank, 11 --- case lid, 12 --- handle, 2 --- gear, 3 --- gear reducer, 31 --- input shaft,
32 --- output shaft, 33 --- convex block, 4 --- oil cylinder, 41 --- transparent observing window, 5 --- injection pump, 51 --- outside oil pump
Shell, 511 --- straight slot, 512 --- oil inlet area, 513 --- fuel feed hole, 52 --- piston, 53 --- shifting block, 54 --- oil spout
Mouth, 55 --- check valve, 551 --- external screw thread, 56 --- adjusting screw, 57 --- spring, 6 --- rotation axis, 7 --- first
Unilateral bearing, 8 --- the second unilateral bearing, 9 --- progressive separator, 91 --- oil inlet, 92 --- oil outlet.
Embodiment
For the technical solution that the present invention will be described in detail, below in conjunction with the attached drawing of the embodiment of the present invention, to of the invention real
The technical solution for applying example carries out clear, complete description.Obviously, described embodiment is the part of the embodiment of the present invention,
Instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art are without creative
All other embodiments obtained on the premise of work, belong to the scope of protection of the invention.
Please refer to Fig.1~7, building hoist lubricating oil spray equipment of the invention, including fuel reserve tank 1, applied for engaging
The gear 2 of work elevator rack, gear reducer 3, oil cylinder 4, the injection pump 5 of adjustable distributive value.Wherein, it is provided with and turns in gear 2
Moving axis 6, gear 2 are sequentially connected by rotation axis 6 and the input shaft 31 of gear reducer 3, and gear 2 is by the first unilateral bearing 7
Be sequentially connected with rotation axis 6, rotation axis 6 is sequentially connected by the input shaft 31 of the second unilateral bearing 8 and gear reducer 3, make tooth
Wheel 2 can drive the input shaft 31 of gear reducer 3 to rotate.
I.e. gear 2 can drive rotation axis 6 to rotate when rotating, and the setting of the first unilateral bearing 7, be turned to limit
Moving axis 6 can only one-directionally rotate；So when building hoist is rotated in rising with moving gear 2（Such as：Rotate forward）When, due to
The limitation of one unilateral bearing 7, rotation axis 6 will not rotate at this time, device is not worked；When building hoist is in decline and with moving teeth
Wheel 2 rotates（Such as：Reversion）When, then gear 2 can drive rotation axis 6 to rotate, and device is worked.So design of the invention,
The line load of building hoist will not additionally be increased, the security of building hoist will not be influenced.
And the setting of the second unilateral bearing 8, it is that can only be one-directionally rotated to limit the input shaft 31 of gear reducer 3, with protection
Injection pump 5, because when the input shaft 31 of gear reducer 3 rotates backward and when causing the output shaft 32 of gear reducer 3 to rotate backward, easily
Cause the damage of injection pump 5.
Oil cylinder 4 is located at the bottom of fuel reserve tank 1, and oil cylinder 4 is connected with fuel reserve tank 1, the lubricating oil in fuel reserve tank 1 is flowed into
In oil cylinder 4.Injection pump 5 is located in oil cylinder 4, and output shaft 32 and the injection pump 5 of gear reducer 3 are sequentially connected, and gear reducer 3 is driven
5 oil spout of injection pump.
Preferably, injection pump 5 includes oil pump housing 51, the piston 52 moved back and forth being arranged in oil pump housing 51,
For driving the shifting block 53 of piston 52.Therefore, by stirring shifting block 53 piston 52 can be driven to carry out oil spout.Specifically, shifting block
53 are fixed on the top of piston 52, and the top middle portion of oil pump housing 51 offers the straight slot 511 for protruding and moving for shifting block 53,
The output shaft 32 of gear reducer 3 is provided with the convex block 33 for stirring shifting block 53.When 32 per revolution of output shaft of gear reducer 3,
With regard to driving convex block 33 to stir shifting block 53 once, so that 5 oil spout of injection pump is once.
Wherein, as shown in figure 5, the front portion of oil pump housing 51 is provided with oil inlet area 512, the top in the oil inlet area 512 opens up
There is fuel feed hole 513, the front end of oil pump housing 51 is provided with atomizer 54, is provided between oil inlet area 512 and atomizer 54 unidirectional
Valve 55, the effect of check valve 55 are the lubricating oil in oil inlet area 512 is entered atomizer 54, atomizer by check valve 55
Lubricating oil in 54 cannot be flowed back into oil inlet area 512.
Further, the outside of check valve 55 is provided with external screw thread 551, is provided with oil pump housing 51 outer with check valve 55
551 matched internal thread of screw thread, i.e. check valve 55 are fixed in oil pump housing 51 for threaded connection, moreover, such structure, can
The size of 5 each distributive value of injection pump is adjusted by adjusting the depth of the installation of check valve 55.Wherein, the front end of check valve 55 is set
The groove for turning is equipped with, i.e. check valve 55 is screwed into from the front end of oil pump housing 51；When the depth that check valve 55 is screwed into
When smaller, then the space in oil inlet area 512 is larger so that injection pump 5 it is each distributive value it is larger；It is screwed into when check valve 55
When depth is larger, then the space in oil inlet area 512 is smaller so that injection pump 5 it is each distributive value it is smaller.Therefore, the present invention can
To adjust each distributive value size according to actual needs so that operate with extremely convenient.
Preferably, the rear end of oil pump housing 51 is threaded with adjusting screw 56, is set between adjusting screw 56 and piston 52
Spring 57 is equipped with, 57 one end of spring props up adjusting screw 56, and 57 other end of spring is fixed by socket in the rear end of piston 52.It is such
Structure, can be by adjusting being screwed into depth and adjusting the compression degree of spring 57 for adjusting screw 56, so as to adjust the spray of injection pump 5
Oil pressure.Specifically, when the depth that adjusting screw 56 is screwed into is smaller, then the compression degree of spring 57 is smaller, make piston 52 by
The pressure arrived is smaller, so that the injection pressure of injection pump 5 is smaller；When the depth that adjusting screw 56 is screwed into is larger, then spring
57 compression degree is larger, makes the pressure that piston 52 is subject to larger, so that the injection pressure of injection pump 5 is larger.Therefore, this hair
It is bright can be according to actual needs（Such as：The factors such as the viscosity of lubricating oil, the size of distributive value）And adjust the oil spout of injection pump 5
Pressure.
Preferably, the atomizer 54 of injection pump 5 protrudes from the front side of oil cylinder 4, in order to connected pipes；Adjusting screw 56 is convex
For the rear side of oil cylinder 4, in order to adjust.Certainly, the gap between the component such as fuel reserve tank 1, oil cylinder 4, injection pump 5, with close
Packing seals, and prevents oil leak.
Preferably, present invention additionally comprises progressive separator 9, the oil inlet 91 of progressive separator 9 to pass through oil pipe and spray
The atomizer 54 of oil pump 5 connects, and the lubricating oil that injection pump 5 sprays is delivered to progressive separator 9.Wherein, progressive point
Oily device 9, which is provided with 8 oil outlets, 92,8 oil outlets 92 and is connected to building hoist by oil pipe respectively, to be needed at lubrication,
Due to for progressive separator 9, so, 8 oil outlets 92 is are sequentially output lubricating oil.Specifically, when injection pump 5 sprays for the first time
When oily, then progressive separator 9 controls its first oil outlet 92 to export lubricating oil；When 5 second of oil spout of injection pump, then pass
Its second oil outlet 92 is controlled to export lubricating oil into formula separator 9；The rest may be inferred, so that building hoist each needs
At lubrication, sufficient lubricating oil is all can obtain, and uniformly.
Preferably, the top of fuel reserve tank 1 is provided with case lid 11, and case lid 11 is provided with handle 12, in order to open case lid 11,
Add lubricating oil.Wherein, the bottom of fuel reserve tank 1, the top of oil cylinder 4 offer the through hole to circulate for lubricating oil, make oil storage
The lubricating oil of case 1 can be flowed into oil cylinder 4；, and the outside of oil cylinder 4 is provided with transparent observing window 41, to facilitate in observation oil cylinder 4
The working condition of lubrication oil and all parts.
The present invention connects oil pipe, and fix before use, it is necessary to gear 2 is engaged with the rack of building hoist
All parts.
When in use, operation principle of the invention is：When building hoist rise and when being rotated with moving gear 2, due to the
The limitation of one unilateral bearing 7, rotation axis 6 will not rotate at this time, device is not worked；When building hoist decline with moving gear
During 2 rotation, then gear 2 can drive rotation axis 6 to rotate, then drive the input shaft 31 of gear reducer 3 to rotate by rotation axis 6, so that
The output shaft 32 of gear reducer 3 rotates, and the rotation of the output shaft 32 of gear reducer 3 can drive convex block 33 to rotate, and then stirs injection pump 5
Shifting block 53 be moved rearwards, piston 52 is also moved rearwards and is compressed spring 57, meanwhile, the lubricating oil of oil cylinder 4 is from fuel feed hole 513
Into oil inlet area 512；When convex block 33 leaves shifting block 53, piston 52 moves forward under the restoring force of spring 57, by oil inlet area
Lubricating oil in 512 is pressed out to atomizer 54 from check valve 55, then is delivered to progressive separator by oil pipe by atomizer 54
9, being finally delivered to building hoist by progressive separator 9 needs lubrication, so as to fulfill automatic lubricating oil spraying.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of scope is protected, although being explained with reference to preferred embodiment to the present invention, those of ordinary skill in the art should
Work as understanding, to technical scheme technical scheme is modified or replaced equivalently, belong to protection scope of the present invention.
Claims (8)
1. a kind of building hoist lubricating oil spray equipment, including fuel reserve tank, it is characterised in that：Further include and risen for engaging construction
The gear of drop machine rack, gear reducer, oil cylinder, the injection pump of adjustable distributive value；
Rotation axis is provided with the gear, the gear is sequentially connected by the input shaft of rotation axis and the gear reducer, and
The gear be sequentially connected by the first unilateral bearing and the rotation axis, the rotation axis be by the second unilateral bearing with
The input shaft of the gear reducer is sequentially connected, and the input shaft that the gear reducer can be driven by making the gear rotates；
The oil cylinder is located at the bottom of the fuel reserve tank, and the oil cylinder is connected with the fuel reserve tank；The injection pump is located at institute
State in oil cylinder, the output shaft of the gear reducer is sequentially connected with the injection pump, the gear reducer is driven the injection pump
Oil spout；
The injection pump includes oil pump housing, the piston moved back and forth being arranged in the oil pump housing, for driving
State the shifting block of piston；
The shifting block is fixed on the top of the piston, and the top middle portion of the oil pump housing is offered and protruded for the shifting block
And mobile straight slot, the output shaft of the gear reducer are provided with the convex block for stirring the shifting block；
The front portion of the oil pump housing is provided with oil inlet area, and the top in the oil inlet area offers fuel feed hole, the oil pump housing
Front end is provided with atomizer, and check valve is provided between the oil inlet area and atomizer；It is provided with the outside of the check valve outer
Screw thread, is provided with and the matched internal thread of the external screw thread of the check valve in the oil pump housing.
2. building hoist lubricating oil spray equipment according to claim 1, it is characterised in that：After the oil pump housing
End is threaded with adjusting screw, spring is provided between the adjusting screw and piston, the spring one end props up the tune
Screw is saved, the spring other end is fixed by socket in the rear end of the piston.
3. building hoist lubricating oil spray equipment according to claim 2, it is characterised in that：The oil spout of the injection pump
Mouth protrudes from the front side of the oil cylinder.
4. building hoist lubricating oil spray equipment according to claim 3, it is characterised in that：The adjusting screw protrusion
In the rear side of the oil cylinder.
5. building hoist lubricating oil spray equipment according to claim 4, it is characterised in that：Further include progressive point of oil
Device, the oil inlet of the progressive separator are connected by oil pipe with the atomizer of the injection pump.
6. building hoist lubricating oil spray equipment according to claim 5, it is characterised in that：The progressive separator
It is provided with 8 oil outlets.
7. building hoist lubricating oil spray equipment according to any one of claims 1 to 6, it is characterised in that：The storage
Case lid is provided with the top of fuel tank, the case lid is provided with handle.
8. building hoist lubricating oil spray equipment according to claim 7, it is characterised in that：The bottom of the fuel reserve tank
End, the top of oil cylinder offer the through hole for lubricating oil circulation, and transparent observing window is provided with the outside of the oil cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410105569.4A CN103867876B (en) | 2014-03-20 | 2014-03-20 | A kind of building hoist lubricating oil spray equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410105569.4A CN103867876B (en) | 2014-03-20 | 2014-03-20 | A kind of building hoist lubricating oil spray equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103867876A CN103867876A (en) | 2014-06-18 |
| CN103867876B true CN103867876B (en) | 2018-04-27 |
Family
ID=50906716
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410105569.4A Expired - Fee Related CN103867876B (en) | 2014-03-20 | 2014-03-20 | A kind of building hoist lubricating oil spray equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103867876B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197175A (en) * | 2014-09-01 | 2014-12-10 | 王积文 | Automatic lubrication device of construction lifter |
| CN104843560A (en) * | 2015-05-26 | 2015-08-19 | 张巍 | Automatic oiling machine of electric construction elevator |
| CN104964152A (en) * | 2015-07-07 | 2015-10-07 | 赵明 | High-rise building construction hoist oiling pump |
| CN111001740B (en) * | 2019-11-28 | 2021-02-26 | 铜陵市兆林工贸有限责任公司 | Forging method of cold-rolled roller blank |
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| CN1763382A (en) * | 2005-10-13 | 2006-04-26 | 何贤能 | Hydraulic and automatic flow control valve |
| CN102644839A (en) * | 2012-05-12 | 2012-08-22 | 李历强 | Lubricating grease filling machine for building machinery |
| CN202812728U (en) * | 2012-08-31 | 2013-03-20 | 三明市金达机电设备有限公司 | Oil injection driving device for automatic oiling machine of elevator |
| CN203269273U (en) * | 2012-12-17 | 2013-11-06 | 冯吉茹 | Lubricating grease painting device for guide rail of construction lifting machine |
| CN203273249U (en) * | 2013-05-19 | 2013-11-06 | 王金宝 | Pinion-and-rack type construction hoist self-lubrication delivery pump |
| CN203319453U (en) * | 2013-07-02 | 2013-12-04 | 李文明 | Building construction elevator lubricator |
| CN203743797U (en) * | 2014-03-20 | 2014-07-30 | 李燕强 | Lubricating oil spraying device in construction hoist |
-
2014
- 2014-03-20 CN CN201410105569.4A patent/CN103867876B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1763382A (en) * | 2005-10-13 | 2006-04-26 | 何贤能 | Hydraulic and automatic flow control valve |
| CN102644839A (en) * | 2012-05-12 | 2012-08-22 | 李历强 | Lubricating grease filling machine for building machinery |
| CN202812728U (en) * | 2012-08-31 | 2013-03-20 | 三明市金达机电设备有限公司 | Oil injection driving device for automatic oiling machine of elevator |
| CN203269273U (en) * | 2012-12-17 | 2013-11-06 | 冯吉茹 | Lubricating grease painting device for guide rail of construction lifting machine |
| CN203273249U (en) * | 2013-05-19 | 2013-11-06 | 王金宝 | Pinion-and-rack type construction hoist self-lubrication delivery pump |
| CN203319453U (en) * | 2013-07-02 | 2013-12-04 | 李文明 | Building construction elevator lubricator |
| CN203743797U (en) * | 2014-03-20 | 2014-07-30 | 李燕强 | Lubricating oil spraying device in construction hoist |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103867876A (en) | 2014-06-18 |
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