CN109230274A - Hand chain tightener - Google Patents
Hand chain tightener Download PDFInfo
- Publication number
- CN109230274A CN109230274A CN201811186286.1A CN201811186286A CN109230274A CN 109230274 A CN109230274 A CN 109230274A CN 201811186286 A CN201811186286 A CN 201811186286A CN 109230274 A CN109230274 A CN 109230274A
- Authority
- CN
- China
- Prior art keywords
- ratchet
- duplicate gear
- gear
- pedestal
- input unit
- 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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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/44—Belt or chain tensioning arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a kind of hand chain tighteners, it includes retarder, rack tube, rack gear, the first coupler body and the second coupler body, the rack tube is fixedly connected with the retarder, the rack gear is assemblied in rack tube, the output section of the rack gear and the retarder is sequentially connected, the rack gear is connect with first coupler body, and second coupler body is connect with the rack tube, and the input unit of the retarder connects ratchet mechanism.Chain tightener of the invention is small in size.
Description
Technical field
The present invention relates to tightening equipment technical field, in particular to a kind of hand chain tighteners.
Background technique
The present invention belongs to the relevant technologies related to the present invention for the description of background technique, be only used for explanation and just
In understanding summary of the invention of the invention, it should not be construed as applicant and be specifically identified to or estimate applicant being considered of the invention for the first time
The prior art for the applying date filed an application.
Chain tightener is used for multiple industries, such as the matched drag conveyor of coalcutter.The conveying of underground coal mine scraper plate
The chain connected between each scraper plate in machine, scraper chain overrelaxation will cause chain and are blocked in derailleur, scraper chain is caused to be jumped
Chain such as falls chain, slides down at the accidents.And chain tightener can further scraper plate, tear open the operation such as chain.
General chain tightener all uses motor driven, this kind of chain tightener is chiefly used in large scale equipment.Due to chain tightener
It carries out loosening, tighten operation, therefore its driving mechanism is driven to need positive and negative operating.Using higher cost when motor driven, volume
Greatly, it is not suitable for small-sized drag conveyor.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of hand chain tightener, main purpose is to provide a kind of small in size
Chain tightener.
In order to achieve the above objectives, present invention generally provides following technical solutions:
In a first aspect, the embodiment of the invention provides a kind of hand chain tighteners comprising retarder, rack tube, tooth
Item, the first coupler body and the second coupler body, the rack tube are fixedly connected with the retarder, and the rack gear is assemblied in rack tube,
The output section of the rack gear and the retarder is sequentially connected, and the rack gear is connect with first coupler body, second coupler body
It is connect with the rack tube, the input unit of the retarder connects ratchet mechanism.
As an alternative embodiment, the ratchet mechanism includes:
Ratchet portion is connect with the input unit of the retarder, and the ratchet portion drives the input unit rotation；
Check pawl, hinged with retarder, the check pawl acts on the ratchet in the ratchet portion, so that described
Ratchet one-way rotation；
Rocking bar is connect with the ratchet portion, to drive the ratchet portion to rotate.
As an alternative embodiment, the ratchet portion includes:
First pedestal is sheathed in the input unit, has axial stop, the axial stop in the input unit
Limit the maximum distance of free end of first pedestal apart from the input unit；
Ratchet is sheathed in the input unit；
Second pedestal is threadedly coupled with the input unit, and the ratchet is set to first pedestal and second pedestal
Between；
The rocking bar is connect with second pedestal.
As an alternative embodiment, first pedestal and the input unit are circumferentially fixed.
As an alternative embodiment, the ratchet portion further includes friction plate, between first pedestal and the ratchet
Equipped with the friction plate, and/or
The friction plate is equipped between second pedestal and the ratchet.
As an alternative embodiment, the rocking bar and the ratchet portion are rotatablely connected, the pivot center of the rocking bar with
The axis of ratchet in the ratchet portion is overlapped, and is hinged with the driving pawl for acting on ratchet on the rocking bar.
As an alternative embodiment, the rocking bar is fixedly connected with the ratchet portion.
As an alternative embodiment, the retarder includes:
Cabinet；
Input shaft stretches out input unit of the one end of the cabinet as the retarder；
First output shaft, one end stretch out the cabinet；
Second output shaft, one end export the cabinet；
Master gear is set on the input shaft, and the master gear rotates under the drive of the input shaft；
First duplicate gear is rotatablely connected with the input shaft；
Second duplicate gear is rotatablely connected with first output shaft；
Third duplicate gear is rotatablely connected with second output shaft；
4th duplicate gear is rotatablely connected with first output shaft；
5th duplicate gear is rotatablely connected with second output shaft；
Wherein the master gear engages respectively with second duplicate gear and the third duplicate gear, described in driving
Second duplicate gear and third duplicate gear rotation；
The third duplicate gear and second duplicate gear are engaged with first duplicate gear respectively, to drive
State the rotation of the first duplicate gear；
First duplicate gear engages respectively with the 4th duplicate gear and the 5th duplicate gear, to drive
State the 4th duplicate gear and the 5th duplicate gear rotation；
One tooth of the 4th duplicate gear stretches out the cabinet as the first output section, and the one of the 5th duplicate gear
Tooth stretches out the cabinet as the second output section.
As an alternative embodiment, first coupler body is fixedly connected with the rack gear.
Compared with prior art, the beneficial effect of the embodiment of the present invention is:
Hand chain tightener provided in an embodiment of the present invention is driven using ratchet mechanism, small in size, direct labor
Operation, the cable etc. without auxiliary, using flexible tear the operation such as chain open suitable for small-sized drag conveyor.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of an embodiment of hand chain tightener of the present invention；
Fig. 2 shows the schematic diagram of internal structures of an embodiment of hand chain tightener of the present invention；
Fig. 3 shows the exploded structural schematic diagram of an embodiment of hand chain tightener of the present invention；
Fig. 4 shows the exploded structural schematic diagram of an embodiment of hand chain tightener of the present invention.
Specific embodiment
Present invention is further described in detail combined with specific embodiments below, but not as a limitation of the invention.?
In following the description, what different " embodiment " or " embodiment " referred to is not necessarily the same embodiment.In addition, one or more are implemented
Special characteristic, structure or feature in example can be combined by any suitable form.
The embodiment of the invention provides a kind of hand chain tighteners.Fig. 1 shows hand chain tightener of the present invention
The structural schematic diagram of one embodiment；Fig. 2 shows the schematic diagram of internal structures of an embodiment of hand chain tightener of the present invention；
Fig. 3 shows the exploded structural schematic diagram of an embodiment of hand chain tightener of the present invention；Fig. 4 shows hand of the present invention
The exploded structural schematic diagram of one embodiment of dynamic formula chain tightener.Referring to Fig. 1 to Fig. 4, the hand of the embodiment of the present invention
Chain tightener includes retarder 200, rack tube 700, rack gear 800, the first coupler body 900 and the second coupler body 400, rack tube 700 with
Retarder 200 is fixedly connected, and rack gear 800 is assemblied in rack tube 700, and the output section of rack gear 800 and retarder 200, which is driven, to be connected
It connects, rack gear 800 is connect with the first coupler body 900, and the second coupler body 400 is connect with rack tube 700, the input unit connection of retarder 200
Ratchet mechanism 100.
Hand chain tightener provided in an embodiment of the present invention is driven using ratchet mechanism 100, small in size, direct people
Work operation, the cable etc. without auxiliary, using flexible tear the operation such as chain open suitable for small-sized drag conveyor.
In an alternative embodiment of the invention, include: referring to figure, 1 Fig. 3 and Fig. 4, ratchet mechanism 100
Ratchet portion 110 is connect with the input unit of retarder, and ratchet portion 110 drives input unit rotation；
Check pawl 120, hinged with retarder, check pawl 120 acts on the ratchet 112 in ratchet portion 110, so that
Ratchet 112 one-directionally rotates；
Rocking bar 130 is connect with ratchet portion 110, with the rotation of driving pawl portion 110.
In the present embodiment, ratchet portion 110 is driven to rotate by rocking bar 130, check pawl 120 acts on ratchet portion 110
Ratchet 112 rotate ratchet 112 can only in one direction, and the favorite outer revolution of tight chain process is avoided to cause the accident.
In the embodiment of the present invention, ratchet portion 110 can only include ratchet 112.It, can when ratchet portion 110 only includes ratchet 112
To be to be fixed ratchet 112 with input unit by screw element (such as nut) etc..Ratchet portion 110 can also include other assemblies with
Ratchet fits together.For example, with reference to Fig. 3, ratchet portion 110 includes:
First pedestal 111, is sheathed in input unit, has axial stop, axial stop limitation first in input unit
The maximum distance of the free end in pedestal distance input portion；
Ratchet 112, is sheathed in input unit；
Second pedestal 113, is threadedly coupled with input unit, and ratchet 112 is set between the first pedestal 111 and the second pedestal 113；
Rocking bar 130 is connect with the second pedestal 113.
In the present embodiment, the first pedestal 111 and ratchet 112 are sheathed in input unit, the second pedestal 113 and input unit screw thread
Connection, when shaking rocking bar 130 the second pedestal 113 being driven to rotate to the direction for screwing in screw thread, the second pedestal 113 is to the first pedestal
111 directions are mobile, and due to the blocking of axial stop, the first pedestal 111 can not be moved, and ratchet 112 is by the second pedestal 113 and the
One pedestal 111 clamps, and under the action of frictional force, the first pedestal 111, ratchet 112 and the second pedestal 113 rotate together, then
Ratchet portion 110 drives input unit rotation, and check pawl 120, which acts on ratchet 112, one-directionally rotates ratchet portion.So as to so as to divide
Two objects (such as scraper plate) for not connecting the first coupler body 900 and the second coupler body 400 are close to each other, so as to complete related work
Industry (such as tearing chain open).After the completion of related operation, when the output section of retarder and input unit need to rotate backward, due to non-return spine
The effect of pawl 120, ratchet 112 cannot rotate backward.At this point, the second pedestal 113 is rotated backward by rocking bar 130, in screw thread
Under effect, the second pedestal 113 is mobile to the end of input unit, input unit and is freely rotated relative to ratchet 112.
In the above-described embodiments, ratchet portion 110 can be is driven by frictional force, is also possible to pass by other means
It is dynamic.For example, the first pedestal 111 and input unit are circumferentially fixed as alternative embodiment.Above-mentioned circumferentially fixed concrete mode is not
Limit.Such as it can be circumferentially fixed by the cooperation realization of key and keyway.Or it is non-circular for being also possible to the hole of the first pedestal 111
Shape hole, input unit have the fixed part matched with the non-circular hole.It is polygon that above-mentioned non-circular hole, which for example can be section,
The hole of shape (such as quadrangle, hexagon etc.), and be then corresponding polygonal body with the fixed part that the polygonal hole matches.
In order to increase frictional force, the corresponding face of the first pedestal 111, ratchet 112 and the second pedestal 113 can increase surface
Roughness, or the material big in corresponding surface recombination frictional force.
As alternative embodiment, referring to Fig. 3 and Fig. 4, ratchet portion 110 further includes axle sleeve, and axle sleeve 114 is sheathed on input unit
On, ratchet 112 is sheathed on axle sleeve 114.Wherein, axle sleeve 114 can be an independent component.Axle sleeve 114 be also possible to
First pedestal, 111 one.That is it axially extends to form axle sleeve 114 on the first pedestal 111.The specific can be that axle sleeve 114 and
One pedestal 111 is integrally formed, and the one end for being also possible to axle sleeve 114 is fixedly connected by modes such as welding with the first pedestal.
As alternative embodiment, referring to fig. 4, ratchet portion 110 further includes friction plate 115, the first pedestal 111 and ratchet 112
Between be equipped with friction plate 115, and/or
Friction plate 115 is equipped between second pedestal 113 and ratchet 112.
The frictional force between each component is increased by the way that friction plate is arranged.In addition, setting friction plate also may be implemented flexibly
Replacement.
An alternative embodiment of the invention, referring to fig. 2, rocking bar 130 is fixedly connected with ratchet portion 110.In the present embodiment, lead to
It crosses rocking bar 130 and increases power arm, realize tight chain so as to apply lesser power.For example, when ratchet portion 110 only includes ratchet
When 112, rocking bar 130, which can be, to be directly fixedly connected with ratchet 112.For example, ratchet portion 110 includes second in above-described embodiment
When pedestal 113, rocking bar 130 can be to be fixedly connected with the second pedestal 113.Alternatively, in another alternative embodiment of the invention,
Rocking bar 130 and ratchet portion 110 are hinged, and the driving pawl for acting on ratchet is hinged on rocking bar 130.For example, working as ratchet portion 110 only
When including ratchet 112, rocking bar 130 can be directly hinged with ratchet 112.For example, ratchet portion 110 includes in above-described embodiment
When the second pedestal 113, rocking bar 130 can be hinged with the second pedestal 113.In the embodiment, it can be set on the second pedestal 113
Positioning column.Positioning column can be fixedly connected with the second pedestal 113, be also possible to be detachably connected by modes such as screw threads.Rocking bar
130 turn to when being in contact with positioning column, the second pedestal 113 can be made to rotate, and then ratchet portion 110 is opposite with input unit solid
It is fixed.The present embodiment is hinged by rocking bar 130 and ratchet portion 110, and rocking bar 130 drives ratchet wheel by driving pawl, is shaking
In the identical situation of 130 length of bar, the power arm of the present embodiment is bigger, operates more labor-saving.
Deceleration implement body in the embodiment of the present invention can be gear set, and the output section of retarder can be uniaxial output,
It is also possible to twin shaft output.Referring to fig. 2, in an alternative embodiment of the invention, retarder 200 includes:
Cabinet 201；
Input shaft 202 stretches out input unit of the one end of cabinet 201 as retarder；
First output shaft 203, one end stretch out cabinet 201；
Second output shaft 204, one end export cabinet 201；
Master gear 205 is set on input shaft 202, and master gear 205 rotates under the drive of input shaft 202；
First duplicate gear 205 is rotatablely connected with input shaft 202；
Second duplicate gear 207 is rotatablely connected with the first output shaft 203；
Third duplicate gear 208 is rotatablely connected with the second output shaft 204；
4th duplicate gear 209 is rotatablely connected with the first output shaft 203；
5th duplicate gear 210 is rotatablely connected with the second output shaft 204；
Wherein master gear 205 engages respectively with the second duplicate gear 207 and third duplicate gear 208, to drive second pair
Join gear 207 and third duplicate gear 208 rotates；
Third duplicate gear 208 and the second duplicate gear 207 are engaged with the first duplicate gear 206 respectively, to drive first
Duplicate gear rotation；
First duplicate gear 206 engages respectively with the 4th duplicate gear 209 and the 5th duplicate gear 210, to drive the 4th
Duplicate gear 209 and the rotation of the 5th duplicate gear 210；
One tooth of the 4th duplicate gear 209 stretches out cabinet 201 and is used as the first output section, a tooth of the 5th duplicate gear 210
It stretches out cabinet 201 and is used as the second output section.
The first coupler body 900 in the embodiment of the present invention can be to be fixedly connected with rack gear 800.Such as first coupler body 900 can
Being welded with rack gear 800.Alternatively, the first coupler body 900 is also possible to rotatably connect by connecting mechanism for rotating and rack gear 800
It connects.In the present embodiment, the first coupler body 900 can be rotated relative to rack gear 800, when the object tilt of its connection, avoid tight chain
Device receives distortion power.
In one embodiment of the invention, the first coupler body 900 can be with rack gear 800 and can relatively rotate in a direction,
Can be can relatively rotate in a plurality of directions.For example, rotary shaft and tooth that the first coupler body 900 is rotated relative to rack gear 800
Item 800 is parallel.Rack gear 800 be strip object, therefore it is parallel with rack gear 800 refer to along 800 length direction of rack gear extension
Straight line parallel.The present embodiment can be such that chain tightener turns round to avoid the inclination due to the object connecting with chain tightener (such as scraper plate)
It is bent.
The specific structure of connecting mechanism for rotating is unlimited in the embodiment of the present invention, for example, can be the first coupler body 900 relative to
Rack gear 800 is rotated along fixing axle or connecting mechanism for rotating may be joint coupling.The first coupler body 900 can be made opposite
It is rotated in a plurality of directions in rack gear 800.
In the present invention, term " first ", " second " etc. are only used for the purpose of description, are not understood to indicate or imply
Relative importance or sequence；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can
Dismantling connection, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In description of the invention, it is to be understood that the orientation or positional relationship of the instructions such as term " on ", "lower" be based on
Orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion institute
The device or unit of finger must have specific direction, be constructed and operated in a specific orientation, it is thus impossible to be interpreted as to this hair
Bright limitation.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. hand chain tightener comprising retarder, rack tube, rack gear, the first coupler body and the second coupler body, the rack tube with
The retarder is fixedly connected, and the rack gear is assemblied in rack tube, and the output section of the rack gear and the retarder, which is driven, to be connected
It connects, the rack gear is connect with first coupler body, and second coupler body is connect with the rack tube, the input unit of the retarder
Connect ratchet mechanism.
2. hand chain tightener according to claim 1, which is characterized in that the ratchet mechanism includes:
Ratchet portion is connect with the input unit of the retarder, and the ratchet portion drives the input unit rotation；
Check pawl, hinged with retarder, the check pawl acts on the ratchet in the ratchet portion, so that the ratchet
One-directional rotation；
Rocking bar is connect with the ratchet portion, to drive the ratchet portion to rotate.
3. hand chain tightener according to claim 2, which is characterized in that the ratchet portion includes:
First pedestal is sheathed in the input unit, has axial stop, the axial stop limitation in the input unit
The maximum distance of free end of first pedestal apart from the input unit；
Ratchet is sheathed in the input unit；
Second pedestal is threadedly coupled with the input unit, and the ratchet is set between first pedestal and second pedestal；
The rocking bar is connect with second pedestal.
4. hand chain tightener according to claim 3, which is characterized in that first pedestal and input unit week
To fixation.
5. hand chain tightener according to claim 3, which is characterized in that the ratchet portion further includes friction plate, institute
It states and is equipped with the friction plate between the first pedestal and the ratchet, and/or
The friction plate is equipped between second pedestal and the ratchet.
6. hand chain tightener according to claim 3, which is characterized in that ratchet portion further includes axle sleeve, and axle sleeve is arranged
In in input unit, ratchet sleeve is set on axle sleeve.
7. according to the described in any item hand chain tighteners of claim 2 to 6, which is characterized in that the rocking bar and the spine
Wheel portion rotation connection, the pivot center of the rocking bar are overlapped with the axis of the ratchet in the ratchet portion, hinged on the rocking bar
There is the driving pawl for acting on ratchet.
8. according to the described in any item hand chain tighteners of claim 2-6, which is characterized in that the rocking bar and the ratchet
Portion is fixedly connected.
9. hand chain tightener according to claim 1, which is characterized in that the retarder includes:
Cabinet；
Input shaft stretches out input unit of the one end of the cabinet as the retarder；
First output shaft, one end stretch out the cabinet；
Second output shaft, one end export the cabinet；
Master gear is set on the input shaft, and the master gear rotates under the drive of the input shaft；
First duplicate gear is rotatablely connected with the input shaft；
Second duplicate gear is rotatablely connected with first output shaft；
Third duplicate gear is rotatablely connected with second output shaft；
4th duplicate gear is rotatablely connected with first output shaft；
5th duplicate gear is rotatablely connected with second output shaft；
Wherein the master gear engages respectively with second duplicate gear and the third duplicate gear, to drive described second
Duplicate gear and third duplicate gear rotation；
The third duplicate gear and second duplicate gear are engaged with first duplicate gear respectively, to drive described
The rotation of one duplicate gear；
First duplicate gear engages respectively with the 4th duplicate gear and the 5th duplicate gear, to drive described
Four duplicate gears and the 5th duplicate gear rotation；
One tooth of the 4th duplicate gear stretches out the cabinet as the first output section, and a tooth of the 5th duplicate gear is stretched
The cabinet is as the second output section out.
10. hand chain tightener according to claim 1, which is characterized in that first coupler body and the rack gear are solid
Fixed connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186286.1A CN109230274A (en) | 2018-10-11 | 2018-10-11 | Hand chain tightener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186286.1A CN109230274A (en) | 2018-10-11 | 2018-10-11 | Hand chain tightener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109230274A true CN109230274A (en) | 2019-01-18 |
Family
ID=65052023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811186286.1A Pending CN109230274A (en) | 2018-10-11 | 2018-10-11 | Hand chain tightener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109230274A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2095747U (en) * | 1991-07-13 | 1992-02-12 | 沈献刚 | Quick assembling chain tool |
| CN201647582U (en) * | 2010-04-09 | 2010-11-24 | 鲍云长 | Chain-driving machine for scraper conveyor |
| CN102785215A (en) * | 2012-08-24 | 2012-11-21 | 长治市远路矿用设备有限责任公司 | Chain tightener |
| CN203332841U (en) * | 2013-05-10 | 2013-12-11 | 莱芜钢铁集团有限公司 | Chain tensioning device |
| CN205441746U (en) * | 2016-02-24 | 2016-08-10 | 四川科伦药业股份有限公司 | chain tensioning tool |
| CN106168274A (en) * | 2016-08-30 | 2016-11-30 | 山西晋城无烟煤矿业集团有限责任公司 | Chain tensioning device |
| WO2017153055A1 (en) * | 2016-03-09 | 2017-09-14 | Bobst Mex Sa | Chain tensioner, machine for processing sheet-form elements, and method for tensioning the sets of chains |
-
2018
- 2018-10-11 CN CN201811186286.1A patent/CN109230274A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2095747U (en) * | 1991-07-13 | 1992-02-12 | 沈献刚 | Quick assembling chain tool |
| CN201647582U (en) * | 2010-04-09 | 2010-11-24 | 鲍云长 | Chain-driving machine for scraper conveyor |
| CN102785215A (en) * | 2012-08-24 | 2012-11-21 | 长治市远路矿用设备有限责任公司 | Chain tightener |
| CN203332841U (en) * | 2013-05-10 | 2013-12-11 | 莱芜钢铁集团有限公司 | Chain tensioning device |
| CN205441746U (en) * | 2016-02-24 | 2016-08-10 | 四川科伦药业股份有限公司 | chain tensioning tool |
| WO2017153055A1 (en) * | 2016-03-09 | 2017-09-14 | Bobst Mex Sa | Chain tensioner, machine for processing sheet-form elements, and method for tensioning the sets of chains |
| CN106168274A (en) * | 2016-08-30 | 2016-11-30 | 山西晋城无烟煤矿业集团有限责任公司 | Chain tensioning device |
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Application publication date: 20190118 |