CN104148922B - Workpiece detaching device - Google Patents
Workpiece detaching device Download PDFInfo
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- CN104148922B CN104148922B CN201410361305.5A CN201410361305A CN104148922B CN 104148922 B CN104148922 B CN 104148922B CN 201410361305 A CN201410361305 A CN 201410361305A CN 104148922 B CN104148922 B CN 104148922B
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- hole
- workpiece
- jack
- piston rod
- support
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention provides a workpiece detaching device comprising a jack and a connecting device used for connecting the jack to to-be-detached workpiece. The jack comprises a piston rod and a cylinder body. The connecting device is particularly used for connecting the end of the piston rod to the to-be-detached workpiece. In working, the jack enables the piston rod to shrink and drives the to-be-detached workpiece to move towards the shrinking direction of the piston rod through the connecting device. According to the arrangement, the problems of the conventional workpiece detaching method that the workpiece is pulled out manually during detaching so as to cause a complicated and clumsy detaching process and mass labor cost are solved.
Description
Technical field
The present invention relates to workpiece dismantling technology, more particularly, to a kind of workpiece provision for disengagement.
Background technology
With the development of coal mining industries, hydraulic support is extensive as the vitals controlling coal-face mine pressure
Use, due to the demand of condition of work, the usual volume of hydraulic support is larger and heavy, and because working strength is big, ring
The factors such as border difference, it usually needs detachable maintaining is carried out to hydraulic support；Specifically, the dismounting to hydraulic support, mainly to liquid
On pressure support, the hinged stub between each part is dismantled, and one end of this hinged stub generally has screwed hole, extracting tool
On there is the threaded rod being used in combination, the threaded rod of this extracting tool is screwed in the screwed hole of this stub attendant,
By manpower, this hinged stub is pulled out from hydraulic support.
In prior art, dismounting mode is carried out to stub hinged in hydraulic support, due to needing to rely on people during dismounting
Hinged stub is pulled out by power by pure craft, thus leading to unloading process complicated, clumsy, and consumes a large amount of human costs.
Content of the invention
The present invention provides a kind of workpiece provision for disengagement, to solve to carry out dismounting mode to workpiece in support in prior art,
Due to needing to rely on manpower to pull out workpiece by pure craft during dismounting, thus leading to unloading process complicated, clumsy, and
And consume the problem of a large amount of human costs.
The present invention provides a kind of workpiece provision for disengagement, including：Jack, and it is used for connecting described jack and to be removed
The attachment means of workpiece；
Described jack includes piston rod and cylinder body, described attachment means specifically for connect described piston rod end and
Described workpiece, wherein, makes described piston rod shrink during described jack work, and drives described work by described attachment means
Part moves to the direction that described piston rod shrinks.
Device as above, wherein, described attachment means include connecting rod, connector and restriction bearing pin, wherein, described
First through hole is provided with the horizontal axis of connector, one end of described first through hole is screwed hole, described workpiece to be removed
One end has screwed hole；
The two ends of described connecting rod are disposed as threaded rod, connect the screwed hole of described connector and described to be removed respectively
The screwed hole of workpiece one end；
The second through hole being intersected vertically with described first through hole, described piston are provided with the vertical direction of described connector
One end of bar is provided with third through-hole, and wherein, the other end of described first through hole is used for inserting one end of described piston rod, and
The third through-hole of the second through hole of described connector and described piston rod is overlapping, and described restriction bearing pin is used for inserting described second and leads to
In hole and described third through-hole.
Device as above, wherein, described device also includes barrel support, and the horizontal direction of described barrel support is provided with
Fourth hole, described barrel support is sheathed on one end, one end of described workpiece to be removed and the described attachment means of described jack
On, described one end limiting bearing pin is stretched out from the fourth hole of described barrel support, and wherein, the piston rod of described jack moves
When, drive described restriction bearing pin to move in described fourth hole.
Device as above, wherein, described barrel support includes the first support section and the second support section, and described first
Support section is specifically sheathed on the piston rod of one end, described attachment means and described jack of described workpiece to be removed, institute
State the second support section to be specifically set on the cylinder body of described jack.
Device as above, wherein, the quantity of the fourth hole of described barrel support is four, is specifically located at described the
On one support section.
Device as above, wherein, described device also includes bracing frame, for supporting described jack, described waiting to tear open
Unload workpiece, described attachment means and described barrel support.
As shown from the above technical solution, workpiece provision for disengagement provided by the present invention, connects jack by attachment means
Piston rod and workpiece to be removed, so that piston rod is shunk, and driven by attachment means to be removed
Workpiece is moved it is achieved that being dismantled to workpiece by the mechanical movement of jack to the direction that piston rod shrinks, and solves existing
There is the dismounting mode to workpiece in support in technology, due to needing to rely on manpower to draw workpiece by pure craft during dismounting
Going out, thus leading to unloading process complicated, clumsy, and consuming the problem of a large amount of human costs so that dismantlement work is more light
Loose measure just, and correspondingly reduces dismantlement work intensity and human cost.
Brief description
A kind of structural representation of workpiece provision for disengagement that Fig. 1 is provided by the embodiment of the present invention；
A kind of structural representation of hydraulic support that Fig. 2 provides for prior art；
Fig. 3 is the structural representation of the hinged stub in hydraulic support shown in Fig. 2；
The structural representation of another kind of workpiece provision for disengagement that Fig. 4 is provided by the embodiment of the present invention；
The structural representation of connecting rod in the workpiece provision for disengagement that Fig. 5 provides for embodiment illustrated in fig. 4；
The front view of connector in the workpiece provision for disengagement that Fig. 6 provides for embodiment illustrated in fig. 4；
The top view of connector in the workpiece provision for disengagement that Fig. 7 provides for embodiment illustrated in fig. 4；
The structural representation of another workpiece provision for disengagement that Fig. 8 is provided by the embodiment of the present invention；
A kind of structural representation of barrel support in the workpiece provision for disengagement that Fig. 9 provides for embodiment illustrated in fig. 8；
Profile on horizontal axis for the barrel support that Figure 10 provides for embodiment illustrated in fig. 9；
The structural representation of another kind of barrel support in the workpiece provision for disengagement that Figure 11 provides for embodiment illustrated in fig. 8.
Specific embodiment
A kind of structural representation of workpiece provision for disengagement that Fig. 1 is provided by the embodiment of the present invention.As shown in figure 1, this reality
The workpiece provision for disengagement 10 that applying example is provided includes：Jack 100, and be used for connecting this jack 100 and workpiece to be removed
200 attachment means 300；This jack 100 includes piston rod 110 and cylinder body 120, and attachment means 300 are lived specifically for connecting
The end of stopper rod 110 and workpiece to be removed 200, wherein, make piston rod 110 shrink during jack 100 work, and by this even
Connection device 300 drives workpiece 200 to be removed to move to the direction that piston rod 110 shrinks.
The workpiece provision for disengagement 10 that the present embodiment is provided, for removing and installing the workpiece on support, the present embodiment has
Body pass through the hinged stub being installed on hydraulic support is dismantled as a example be explained, Fig. 2 provide for prior art one
Plant the structural representation of hydraulic support, Fig. 3 is the structural representation of the hinged stub in hydraulic support shown in Fig. 2, needs explanation
, because the volume of hydraulic support 20 is larger, a part for hydraulic support 20 is only shown in Fig. 2, this part includes hydraulic pressure and props up
The hinged stub connect between each part is used on frame 20, that is, in the present embodiment, needs the workpiece to be removed 200 dismantled；For
Make hinged stub 200 be easy to pull-out from hydraulic support 20, screwed hole can be designed in its end in design processing
210, the diameter of this screwed hole 210 can be preset fixed dimension, correspondingly, extracting tool is provided with and screwed hole 210
The threaded rod using cooperatively, as shown in Fig. 2 the screwed hole 210 being arranged on the hinged stub 200 on hydraulic support 20 is hinged at this
The right-hand member of stub 200, that is, this hinged stub 200 can pull out from the right side of hydraulic support 20；Specifically, this is torn open by attendant
The threaded rod unloading instrument is screwed in the screwed hole 210 of hinged stub 200, is propped up this hinged stub 200 from hydraulic pressure by manpower
Pull out in the right side of frame 20, however, hydraulic support 20 after down-hole use due to wearing and tearing the reason such as corrosion by manpower very
Hinged stub 200 is pulled out by hardly possible, increased the difficulty dismantling this hinged stub 200.
Dismantle by way of hinged stub 200 compared in prior art by direct manpower, the work that the present embodiment is provided
Hinged stub 200 to be removed and jack 100 are fixed together, concrete by part provision for disengagement 10 by attachment means 300
In realization, one end of attachment means 300 be also equipped with the threaded rod using cooperatively with the screwed hole 210 of hinged stub 200 so that
One end that this attachment means 300 has threaded rod is screwed in the screwed hole 210 of this hinged stub 200, the other end and jack
100 piston rod 110 is fixing, and this hinged stub 200, attachment means 300 are connected in same level axial direction with jack 100
Connect.
Similarly, in the present embodiment, the connected mode of the piston rod 110 of attachment means 300 and jack 100 for example also may be used
With the cooperation by screwed hole and threaded rod, the present embodiment does not limit the connected mode of attachment means 300 and piston rod 110, only
If can in the way of jack 100 and hinged stub 200 to be connected in same level axial direction.
Jack 100 in the present embodiment can be for example hydraulic jack, before dismantlement work, the work of jack 100
Stopper rod 110 stretches out state, when dismantlement work starts, makes cylinder body by injection emulsion in the cylinder body 120 to jack
120 motions, and drive piston rod 110 to be retracted in cylinder body 120, the dismantlement work being injected to hinged stub 200 of this emulsion
Provide power source, therefore, also received to piston rod 110 by the hinged stub 200 that attachment means 300 are connected with piston rod 110
Contracting direction move, that is, the present embodiment provide workpiece provision for disengagement 10 using jack 100 as power source, especially by very heavy
This hinged stub 200 is pulled out from hydraulic support 20 by the mechanical movement on top 100, and the piston rod 110 of jack 100 shrinks, draws
The feature stretched disclosure satisfy that the work requirements dismantling hinged stub 200, therefore, simplifies dismantlement work intensity so that dismantling work
Make more easy and convenient.
It should be noted that the present embodiment is not limited to the concrete workpiece that workpiece provision for disengagement 10 is dismantled, for example permissible
To the hinged stub in the hydraulic support described in the present embodiment being dismantled it is also possible to other larger equipment or support
The more firm workpiece of middle fixation is dismantled, and reduces working strength and the human cost of dismounting workpiece.
The workpiece provision for disengagement that the present embodiment is provided, connects the piston rod of jack and to be removed by attachment means
Workpiece, makes when jack works piston rod shrink, and drives workpiece to be removed to shrink to piston rod by attachment means
Direction is moved it is achieved that being dismantled to workpiece by the mechanical movement of jack, solves in prior art to work in support
The dismounting mode of part, due to needing to rely on manpower to pull out workpiece by pure craft during dismounting, thus lead to dismantle
Journey is complicated, clumsy, and consumes the problem of a large amount of human costs so that dismantlement work is more easy and convenient, and correspondingly
Reduce dismantlement work intensity and human cost.
The structural representation of another kind of workpiece provision for disengagement that Fig. 4 is provided by the embodiment of the present invention.Above-mentioned as Fig. 1 institute
On the basis of showing device, in the workpiece provision for disengagement 10 that the present embodiment is provided, attachment means 300 include connecting rod 310, connect
320 and limit bearing pin 330, wherein, the horizontal axis of connector 320 is provided with first through hole 321, this first through hole 321
One end be screwed hole 321a, one end of workpiece 200 to be removed has screwed hole 210；The two ends of connecting rod 310 are disposed as spiral shell
Rasp bar, connects the screwed hole 321a of this connector 320 and the screwed hole 210 of workpiece to be removed 200 one end respectively；Connector 320
Vertical direction on be provided with the second through hole 322 intersecting vertically with first through hole 321, one end of piston rod 110 is provided with
Three through holes 111, wherein, the other end of first through hole 321 is used for inserting one end of this piston rod 110, and this connector 320
The third through-hole 111 of the second through hole 322 and this piston rod 110 is overlapping, limits bearing pin 330 and is used for inserting this second through hole 322 He
In this third through-hole 111.
The structural representation of connecting rod in the workpiece provision for disengagement that Fig. 5 provides for embodiment illustrated in fig. 4, Fig. 6 is shown in Fig. 4
The front view of connector, the workpiece provision for disengagement that Fig. 7 provides for embodiment illustrated in fig. 4 in the workpiece provision for disengagement that embodiment provides
The top view of middle connector.Refer to Fig. 4 to Fig. 7, in the present embodiment, especially by connecting rod 310, connector 320 and limit
The attachment means 300 that rationed marketing axle 330 is constituted, by the piston rod 110 of workpiece 200 to be removed and jack 100 on horizontal axis
Link together, identical with the dismounting mode described in above-described embodiment, it is all by the mechanical movement of jack 100, workpiece to be drawn
Go out；In the present embodiment, cooperating by the threaded rod of connecting rod 310, connector 320 and restriction bearing pin 330, meets
The connection of hinged stub 200 and both jack 100, due in unloading process the piston rod 110 of jack 100 can produce with
The relative position change of hydraulic support 20, because attachment means 300 are specifically threaded, prevents hinged master in unloading process
Pin 200 is produced relative rotation thus coming off with jack 100.
Further, the structural representation of another workpiece provision for disengagement that Fig. 8 is provided by the embodiment of the present invention, Fig. 9
A kind of structural representation of barrel support in the workpiece provision for disengagement providing for embodiment illustrated in fig. 8, Figure 10 is embodiment illustrated in fig. 9
Profile on horizontal axis for the barrel support providing.The present embodiment again may be by the hinge being installed on hydraulic support 20
Connect as a example stub 200 is dismantled and be explained, in the present embodiment, workpiece provision for disengagement 10 can also include barrel support 400,
Fourth hole 411 is provided with the horizontal direction of this barrel support 400, this barrel support 400 is sheathed on one end of jack 100, hinge
Connect on one end and attachment means 300 of stub 200, the one end limiting bearing pin 330 is from the fourth hole 411 of this barrel support 400
Stretch out, wherein, when the piston rod 110 of this jack 100 is mobile, drive this restriction bearing pin 330 to move in this fourth hole 411
Dynamic.
The structural representation of another kind of barrel support, this reality in the workpiece provision for disengagement that Figure 11 provides for embodiment illustrated in fig. 8
Apply example in implementing, this barrel support 400 can include the first support section 410 and the second support section 420, this first
Support part is divided on the piston rod 110 of 410 one end, attachment means 300 and jack 100 being specifically sheathed on hinged stub 200, and this
Two support sections 420 are specifically set on the cylinder body 120 of jack 100.
Refer to Fig. 8 to Figure 11, in the present embodiment, the barrel support 400 in this workpiece provision for disengagement 10 is set in hinged
One end that stub 200 is connected with attachment means 300, and be integrally set in attachment means 300, also it is set in jack 100
Piston rod 110 and a part for cylinder body 120, specific frock process typically, by the threaded rod of connecting rod 310 one end with
The screwed hole 321a of connector 320 is connected, and piston rod 110 is inserted in the first through hole 321 of connector 320, and adjustment is even
The relative position of joint 320 and piston rod is so that the third through-hole 111 of the second through hole 322 of connector 320 and piston rod 110
Overlap, starts to be inserted in barrel support 400 so that the second support section 420 is set in jack from the other end of connecting rod 310
On 100 cylinder body 120, and the first support section 410 is set on whole attachment means 300 and piston rod 110, adjusts further
The position of the fourth hole 411 on whole barrel support 400 is so that this fourth hole 411 and the second through hole 322 and third through-hole 111
Overlap, and then bearing pin 330 will be limited through the 4th by the 411, second through hole 322 and third through-hole 111.It should be noted that
The present embodiment is only gived and hinged stub 200 and jack 100 is attached admittedly by attachment means 300 and barrel support 400
A kind of fixed mode, the invention is not restricted to the mode of the present embodiment offer, as long as consolidating shown by the present embodiment can be reached
Determine the mounting means of effect, may be incorporated in the installation of workpiece provision for disengagement 10 of the present embodiment offer.
The workpiece provision for disengagement 10 that the present embodiment provides, adds the design of barrel support 400, the first support section 410 exists
Effectively avoid hinged stub 200 in drawing process under the auxiliary of spacing bearing pin 330 and produce relative turning with jack 100
Dynamic, specifically, made piston rod 110 and the connecting rod 310 of jack 100 by the effect of spacing bearing pin 330 by connector 320
Be connected, simultaneously by the railway effect between spacing bearing pin 330 and barrel support 400 make hydraulic support 20 hinged stub 200,
Can not relatively rotate between connecting rod 310, connector 320 and jack 100, play a protective role, and limit pin
Axle 330 can move in fourth hole 411 with the motion of piston rod 110, in the first support section 410 and the second support section
The relative position between attachment means 300 and jack 100, and hydraulic support 20 can be limited under 420 cooperation.
Alternatively, the quantity of the fourth hole 410 of this barrel support 400 is four, is specifically located at its first support section
On 410, because this first support section 410 is specifically set in attachment means 300, and limit one end of bearing pin 330 from this
Stretch out in fourth hole 411, therefore, barrel support 400 limits the rotation of attachment means 300 especially by this fourth hole 411, that is,
Define relatively rotating of hinged stub 200 and jack 100.Thus the joining of workpiece provision for disengagement 10 providing in the present embodiment
Under conjunction, the operation optimizing hinged stub 200 dismounting, so that the unloading process of hinged stub 200 is convenient, realizes mechanization
Operation, and correspondingly save human cost.
Further, the workpiece provision for disengagement that the present embodiment provides, can also include bracing frame 30, very heavy for supporting
Top 100, hinged stub 200, attachment means 300 and barrel support 400, are the dismounting of hinged stub 200 of hydraulic support 20 in work
One support platform is provided in work.Further improve the convenience of dismantlement work.
Finally it should be noted that：Various embodiments above only in order to technical scheme to be described, is not intended to limit；To the greatest extent
Pipe has been described in detail to the present invention with reference to foregoing embodiments, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, or wherein some or all of technical characteristic is entered
Row equivalent；And these modifications or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention technology
The scope of scheme.
Claims (5)
1. a kind of workpiece provision for disengagement is it is characterised in that include：Jack, and it is used for connecting described jack and to be removed
The attachment means of workpiece；
Described jack includes piston rod and cylinder body, and described attachment means are specifically for connecting the end of described piston rod and described
Workpiece to be removed, wherein, is made described piston rod shrink during described jack work, and is driven by described attachment means described
Workpiece to be removed moves to the direction that described piston rod shrinks；
Described attachment means include connecting rod, connector and restriction bearing pin, wherein, the horizontal axis of described connector are provided with
First through hole, one end of described first through hole is screwed hole, and one end of described workpiece to be removed has screwed hole；
The two ends of described connecting rod are disposed as threaded rod, connect the screwed hole of described connector and described workpiece to be removed respectively
The screwed hole of one end；
The second through hole being intersected vertically with described first through hole is provided with the vertical direction of described connector, described piston rod
One end is provided with third through-hole, and wherein, the other end of described first through hole is used for inserting one end of described piston rod, and described
The third through-hole of the second through hole of connector and described piston rod is overlapping, described restriction bearing pin be used for inserting described second through hole and
In described third through-hole.
2. device according to claim 1 is it is characterised in that described device also includes barrel support, the water of described barrel support
Square set up fourth hole, described barrel support is sheathed on one end of described jack, one end of described workpiece to be removed
In described attachment means, described one end limiting bearing pin is stretched out from the fourth hole of described barrel support, wherein, described very heavy
When the piston rod on top is mobile, described restriction bearing pin is driven to move in described fourth hole.
3. device according to claim 2 is it is characterised in that described barrel support includes the first support section and the second support
Part, described first support section is specifically sheathed on one end, described attachment means and the described jack of described workpiece to be removed
Piston rod on, described second support section is specifically set on the cylinder body of described jack.
4. device according to claim 3, it is characterised in that the quantity of the fourth hole of described barrel support is four, has
Body is arranged on described first support section.
5. the device according to any one of Claims 1 to 4, it is characterised in that described device also includes bracing frame, is used for
Support described jack, described workpiece to be removed, described attachment means and described barrel support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410361305.5A CN104148922B (en) | 2014-07-25 | 2014-07-25 | Workpiece detaching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410361305.5A CN104148922B (en) | 2014-07-25 | 2014-07-25 | Workpiece detaching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104148922A CN104148922A (en) | 2014-11-19 |
| CN104148922B true CN104148922B (en) | 2017-02-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410361305.5A Active CN104148922B (en) | 2014-07-25 | 2014-07-25 | Workpiece detaching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104148922B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113199226B (en) * | 2021-03-30 | 2022-11-01 | 武汉船用机械有限责任公司 | A dismouting device for axle type work piece |
| CN115182767A (en) * | 2022-06-30 | 2022-10-14 | 郑州煤矿机械集团股份有限公司 | Quick dismounting and mounting method for hydraulic support balance jack |
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|---|---|---|---|---|
| CN203210301U (en) * | 2013-04-03 | 2013-09-25 | 孙效 | Tool for dismantling taper pin with internal threads |
| CN203317336U (en) * | 2013-06-28 | 2013-12-04 | 淮南矿业(集团)有限责任公司 | Pin pulling device |
| CN103769843A (en) * | 2012-10-23 | 2014-05-07 | 湖北兴发化工集团股份有限公司 | Adjustable taper pin hydraulic puller |
| CN203956462U (en) * | 2014-07-25 | 2014-11-26 | 淮南郑煤机舜立机械有限公司 | Workpiece provision for disengagement |
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2014
- 2014-07-25 CN CN201410361305.5A patent/CN104148922B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103769843A (en) * | 2012-10-23 | 2014-05-07 | 湖北兴发化工集团股份有限公司 | Adjustable taper pin hydraulic puller |
| CN203210301U (en) * | 2013-04-03 | 2013-09-25 | 孙效 | Tool for dismantling taper pin with internal threads |
| CN203317336U (en) * | 2013-06-28 | 2013-12-04 | 淮南矿业(集团)有限责任公司 | Pin pulling device |
| CN203956462U (en) * | 2014-07-25 | 2014-11-26 | 淮南郑煤机舜立机械有限公司 | Workpiece provision for disengagement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104148922A (en) | 2014-11-19 |
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Address after: Wang Feng Gang Zhen Xiejiaji District 232046 Anhui city of Huainan Province Co-patentee after: Huainan Mining (Group) Co., Ltd. Patentee after: Huainan Shunli Machine Co., Ltd. Address before: Wang Feng Gang Zhen Xiejiaji District 232046 Anhui city of Huainan Province Co-patentee before: Huainan Mining (Group) Co., Ltd. Patentee before: Huainan Zheng Coal Machine Shunli Machinery Co., Ltd. |
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