CN106672761A - Elevator - Google Patents
Elevator Download PDFInfo
- Publication number
- CN106672761A CN106672761A CN201611255943.4A CN201611255943A CN106672761A CN 106672761 A CN106672761 A CN 106672761A CN 201611255943 A CN201611255943 A CN 201611255943A CN 106672761 A CN106672761 A CN 106672761A
- Authority
- CN
- China
- Prior art keywords
- car
- lift
- hoist ropes
- spring
- pouring weight
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/043—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/02—Cages, i.e. cars
- B66B11/0226—Constructional features, e.g. walls assembly, decorative panels, comfort equipment, thermal or sound insulation
- B66B11/024—Ventilation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B17/00—Hoistway equipment
- B66B17/12—Counterpoises
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/02—Guideways; Guides
- B66B7/04—Riding means, e.g. Shoes, Rollers, between car and guiding means, e.g. rails, ropes
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Cage And Drive Apparatuses For Elevators (AREA)
Abstract
The invention relates to an elevator. The elevator comprises an elevator car mounted on a guide rail, a counterweight, a hoisting rope with the two ends correspondingly connected with the elevator car and the counterweight and a tractor for pulling the hoisting rope to drive the elevator car and the counterweight to move up and down. The elevator further comprises a rolling wheel for changing the direction of the hoisting rope and a compensation chain with the two ends correspondingly connected to the elevator car and the lower end of the counterweight. The elevator further comprises a cable with one end fixed to the bottom of the elevator car and the other end fixed into a shaft. The cable moves along with up-down movement of the elevator car.
Description
Technical field
The invention belongs to, and in particular to a kind of lift.
Background technology
In the prior art, various working linings are mainly used for transporting the special cargo lift product of goods between building storey height
Between goods transport up and down；Vehicle hoisting etc. between multi-storied garage and underground garage floor height.Product hydraulic system sets anti-fall, overload peace
Full protection device, each floor and lifting platform work top can be set operation button, realize multiparty control.Product structure is firm,
Bearing capacity is big, and lifting is steady, installs and safeguards simple and convenient, is the preferable goods conveying that economical and practical lowrise interlayer substitutes elevator
Equipment.
The content of the invention
It is a primary object of the present invention to provide a kind of lift, the problems such as to overcome prior art.
To realize aforementioned invention purpose, the technical solution adopted by the present invention includes：
A kind of lift, described lift includes that car, counterweight, the two ends on guide rail connect described respectively
Car and the hoist ropes to pouring weight, for pulling hoist ropes so that described car and the traction machine moved up and down to pouring weight, institute
The lift stated also includes the roller in the direction for changing described hoist ropes, and described lift is also distinguished including both ends
The compensated chain of car and counterweight lower end described in being connected to, described lift is also fixed on described car including one end
Bottom, the other end is fixed on the cable in hoistway, and described cable is moved with moving up and down for car.
Preferably, described traction machine includes base, the decelerator on base, traction sheave and described for driving
Traction sheave motor, described traction machine is typically mounted at the upper side position of hoistway, the fortune for controlling described hoist ropes
It is dynamic.
Preferably, described car includes car body, is provided with described car body for balancing gas in car
The barometric control unit of pressure, described barometric control unit include for conveyed in described car gas ventilating fan,
For air exhauster, the regulation for adjusting described ventilating fan and air exhauster of discharging the gas in described car
Valve.
Preferably, described car is additionally provided with multiple ducts for being used for ventilating fan and air exhauster air inlet and exhaust,
The uniform top for being arranged on described car body in described duct, described car is additionally provided with for measuring described sedan-chair
The pressure test device of air pressure in railway carriage or compartment, described car also includes the result control for the pressure test device detection according to
The controller of the described regulating valve of system.
Preferably, described lift also includes hoist ropes fixing device, and described hoist ropes fixing device is used to install
At car or the top to pouring weight.
Preferably, described hoist ropes fixing device include for be set on described hoist ropes tapered sleeve, be arranged on
The spring assembly being set on described hoist ropes below described tapered sleeve, be provided with the upside of described spring assembly for
The fixed plate of fixed described hoist ropes, described hoist ropes sets through described fixed plate on the downside of described spring assembly
Locking nut is equipped with, described spring assembly is fixed between described fixed plate and described locking nut, described bullet
Spring device includes the first spring, is separately positioned on the spring pad of the described upper and lower both sides of the first spring.
Preferably, described lift also includes boot guiding device, and described boots of leading include shoe, end and described shoe
Rotate connection two wheel arm, be rotatably mounted at the guide wheel of the described wheel arm other end, the boot guiding device also includes one
Guide rod, the two ends of described guide rod are provided with stopper, and two described wheel arm are arranged between two described stoppers, institute
Be additionally provided with two compression springs on the guide rod stated, the compression spring described in two be separately positioned on described stopper with it is described
Wheel arm between, the one end of described compression spring acts on described stopper, and the other end acts on described wheel arm, institute
Two guide wheels for leading boots stated clamp described guide rail under the action of the spring so that car can only be in the vertical fortune of above-below direction
It is dynamic, without vacillating now to the left, now to the right.
Preferably, described counterweight includes framework, and described framework includes being located at the side frame of both sides, is arranged on two
Upper ledge and lower frame between described side frame, be provided with described framework it is multiple be layered on top of each other to pouring weight, described counterweight
Block is provided with the through hole for running through up and down, and the through hole to pouring weight described in multiple is mutually aligned to form penetrating via, and described passes through
Connecting screw rod is provided with break-through road, the upper end of described connecting screw rod is connected with for will be fixed to pouring weight described in multiple
Fixing bolt on framework.
Preferably, mutually it is fixedly connected by L-type fixture between described body side frame and described upper ledge, described fixation
Part includes the longitudinal side plate being mutually fixedly connected with described side frame and the horizontal side plate being mutually fixedly connected with described upper ledge, described
Upper ledge on be provided with multiple cables, the rope hitch plate run through for described multiple cables, described rope hitch plate is provided with multiple confessions
The through hole that described cable runs through, the evenly distributed setting of length direction of the rope hitch plate described in described through hole edge.
Preferably, the sidepiece of described side frame is additionally provided with multiple sliding blocks, and the sidepiece of described side frame is provided with 4 cunnings
Block, respectively positioned at the top and bottom of two side-frames, the bottom of described lower frame is provided with for hanging benefit 4 described sliding blocks
Repay the compensation block of chain.
The present invention relates to a kind of lift, described lift, including car, counterweight, two on guide rail
End connects described car and the hoist ropes to pouring weight respectively, for pulling hoist ropes so that described car and upper and lower to pouring weight
The traction machine of motion, simple structure is easy to use.
Brief description of the drawings
Accompanying drawing described here is only used for task of explanation, and is not intended to by any way limit model disclosed in the present application
Enclose.In addition, shape and proportional sizes of each part in figure etc. are only schematical, the understanding to the application is used to help, and
It is not the shape and proportional sizes for specifically limiting each part of the application.Those skilled in the art, can under teachings of the present application
To select various possible shapes and proportional sizes to implement the application as the case may be.In the accompanying drawings：
Accompanying drawing 1 is a kind of elevator structural representation of the present invention；
Accompanying drawing 2 is a kind of structural representation of car described herein；
Accompanying drawing 3 is a kind of structural representation of hoist ropes fixing device described herein；
Accompanying drawing 4 is a kind of structural representation of traction machine described herein；
Accompanying drawing 5 is a kind of structural representation for leading boots described herein；
Accompanying drawing 6 is a kind of structural representation of counterweight described herein,
In the figures above：1st, car；2nd, counterweight；3rd, traction machine；4th, roller；5th, cable；6th, compensated chain；7th, hoist ropes；
11st, car body；12nd, barometric control unit；13rd, controller；
71st, tapered sleeve；72nd, fixed plate；73rd, spring pad；74th, the first spring；75th, locking nut；
31st, base；32nd, decelerator；33rd, traction sheave；34th, motor；
81st, guide wheel；82nd, wheel arm；83rd, guide rod；84th, stopper；85th, compression spring；86th, shoe；
21st, to pouring weight；22nd, upper ledge；23rd, lower frame；24th, side frame；25th, fixing bolt；26th, sliding block；27th, rope hitch plate；28th, cable；
29th, fixture；20th, compensation block.
Specific embodiment
The application is described in detail below with reference to specific embodiment shown in the drawings.But these implementation methods are simultaneously
The application is not limited, structure that one of ordinary skill in the art is made according to these implementation methods, method or functionally
Conversion is all contained in the protection domain of the application.
In each diagram of the application, for the ease of diagram, structure or some partial sizes can be relative to other knots
Structure or partial enlargement, therefore, it is only used for the basic structure of the theme of diagram the application.
As shown in figure 1, being a kind of lift described herein, described lift includes the car on guide rail
1st, counterweight 2, two ends connect described car 1 and the hoist ropes 7 to pouring weight 21 respectively, for pulling hoist ropes 7 so that institute
The car 1 stated and the traction machine 3 moved up and down to pouring weight 21.Described lift is also included for changing described hoist ropes 7
Direction roller 4.Described lift is also connected to described car 1 and the lower end of counterweight 2 including both ends
Compensated chain 6.Described lift is also fixed on the described bottom of car 1 including one end, and the other end is fixed on the cable in hoistway
5.Described cable 5 is moved with moving up and down for car 1.
As shown in Fig. 2 being the car 1 of lift described herein, described car 1 includes car body 11, described
Car body 11 on be provided with barometric control unit 12 for balancing air pressure in car 1, described barometric control unit 12
Including for the ventilating fan of conveying gas, the exhaust for the gas in described car 1 to be discharged in described car 1
Blower fan, the regulating valve for adjusting described ventilating fan and air exhauster.Described car 1 is additionally provided with multiple for air inlet
Blower fan and the duct of air exhauster air inlet and exhaust, the uniform top for being arranged on described car body 11 in described duct.
Described car 1 is additionally provided with the pressure test device for measuring air pressure in described car 1.Described car 1 also includes
The controller 13 of the regulating valve described in output control detected for the pressure test device described in basis.
Fig. 3 is a kind of fixing device of hoist ropes 7 of lift described herein, and the described fixing device of hoist ropes 7 is used
In installed in car 1 or the top to pouring weight 21, for the hoist ropes 7 described in stabilization, it is set not rock.Described hoist ropes 7
Fixing device include for be set on described hoist ropes 7 tapered sleeve 71, be arranged on being set in for the described lower section of tapered sleeve 71
Spring assembly on described hoist ropes 7, is provided with consolidating for the hoist ropes 7 described in fixation on the upside of described spring assembly
Fixed board 72, described hoist ropes 7 is provided with locking nut 75 through described fixed plate 72 on the downside of described spring assembly,
Described spring assembly is fixed between described fixed plate 72 and described locking nut 75.Described spring assembly includes
First spring 74, the spring pad 73 for being separately positioned on first described spring both sides about 74.
As shown in figure 4, being the traction machine 3 of lift described herein, described traction machine 3 includes base 31, installs
Decelerator 32, traction sheave 33 on base 31 and the motor 34 for driving described traction sheave 33.Described traction machine 3 one
As be arranged on the upper side position of hoistway, the motion for controlling described hoist ropes 7.
As shown in figure 5, being the boot guiding device of lift described herein, described car 1 can typically install multiple and lead
Boots, it is described lead boots rotated with described shoe 86 including shoe 86, end be connected two wheel arm 82, be rotatably mounted at
The guide wheel 81 of the described other end of wheel arm 82, the boot guiding device for being also includes a guide rod 83, the two ends of described guide rod 83
Stopper 84 is provided with, two described wheel arm 82 are arranged between two described stoppers 84.On described guide rod 83 also
Two compression springs 85 are provided with, the compression spring 85 described in two is separately positioned on described stopper 84 and described wheel arm
Between 82, the one end of described compression spring 85 acts on described stopper 84, and the other end acts on described wheel arm 82.
Described two guide wheels 81 for leading boots clamp described guide rail under the action of the spring so that car 1 can only be perpendicular in above-below direction
Straight motion, without vacillating now to the left, now to the right.
As shown in fig. 6, being a kind of counterweight 2 of lift described herein, described counterweight 2 includes frame
Frame, described framework includes the side frame 24 for being located at both sides, the upper ledge 22 and lower frame 23 that are arranged between the side frame 24 described in two,
Be provided with described framework it is multiple be layered on top of each other to pouring weight 21, it is described that run through up and down logical is provided with to pouring weight 21
Hole, the through hole to pouring weight 21 described in multiple is mutually aligned to form penetrating via, and connection spiral shell is provided with described penetrating via
Bar, the upper end of described connecting screw rod is connected with for by the fixing bolt being fixed on to pouring weight 21 on framework described in multiple
25.Mutually it is fixedly connected by L-type fixture 29 between the described frame of side frame 24 and described upper ledge 22, described fixture 29 is wrapped
Include the longitudinal side plate being mutually fixedly connected with described side frame 24 and the horizontal side plate being mutually fixedly connected with described upper ledge 22.It is described
Upper ledge 22 on be provided with multiple cables 28, the rope hitch plate 27 run through for described multiple cables 28, described rope hitch plate 27 sets
Multiple through holes run through for described cable 28 are equipped with, the length direction of the rope hitch plate 27 described in described through hole edge is uniform
Spread configuration.The sidepiece of described side frame 24 is additionally provided with multiple sliding blocks 26.The sidepiece of described side frame 24 is provided with 4 sliding blocks
26,4 described sliding blocks 26 are respectively positioned at the top and bottom of two side-frames 24.The bottom of described lower frame 23 be provided with for
Hang the compensation block 20 of compensated chain 6.
It should be noted that in the description of the present application, in the description of the present application, unless otherwise indicated, " multiple "
It is meant that two or more.
Using term "comprising" or " including " come describe element here, composition, part or step combination it is also contemplated that
The basic implementation method being made up of these elements, composition, part or step.Here by using term " can with ", it is intended to illustrate
Described any attribute that " can with " includes all is optional.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.Alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" of description element, composition, part or step is not said to exclude other elements, composition, part
Or step.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouching
State, many implementation methods and many applications outside the example for being provided all will be for a person skilled in the art aobvious and easy
See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to preceding claims and this
The four corner of the equivalent that a little claims are possessed determines.It is for comprehensive purpose, all articles and special with reference to including
The disclosure of profit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as applicant the theme is not thought of as it is disclosed
Apply for a part for theme.
Those listed above it is a series of describe in detail only for the application feasibility implementation method specifically
It is bright, they and be not used to limit the application protection domain, all equivalent implementations made without departing from the application skill spirit
Or change should be included within the protection domain of the application.
Claims (10)
1. a kind of lift, it is characterised in that：Described lift includes car, counterweight, the two ends on guide rail
Connect described car and the hoist ropes to pouring weight respectively, for pulling hoist ropes so as to described car and transport up and down to pouring weight
Dynamic traction machine, described lift also includes the roller in the direction for changing described hoist ropes, and described lift is also
The compensated chain of described car and counterweight lower end is connected to including both ends, described lift is also solid including one end
Described cage bottom is scheduled on, the other end is fixed on the cable in hoistway, and described cable is moved with moving up and down for car
It is dynamic.
2. a kind of lift according to claim 1, it is characterised in that：Described traction machine is including base, the bottom of installed in
Decelerator, traction sheave on seat and the motor for driving described traction sheave.
3. a kind of lift according to claim 2, it is characterised in that：Described car includes car body, described
Be provided with the barometric control unit for balancing air pressure in car in car body, described barometric control unit include being used for
The ventilating fan of conveying gas in described car, for by the air exhauster of the gas discharge in described car, for adjusting
The regulating valve of the described ventilating fan of section and air exhauster.
4. a kind of lift according to claim 3, it is characterised in that：Described car is additionally provided with multiple for air inlet
Blower fan and the duct of air exhauster air inlet and exhaust, the uniform top for being arranged on described car body in described duct, institute
The car stated is additionally provided with the pressure test device for measuring air pressure in described car, and described car also includes being used for root
According to the controller of the regulating valve described in the output control that described pressure test device is detected.
5. a kind of lift according to claim 4, it is characterised in that：Described lift also includes that hoist ropes fixes dress
Put, described hoist ropes fixing device is used to be arranged on car or the top to pouring weight.
6. a kind of lift according to claim 5, it is characterised in that：Described hoist ropes fixing device is included for covering
The tapered sleeve being located on described hoist ropes, the spring being set on the described hoist ropes dress being arranged on below described tapered sleeve
Put, the fixed plate for the hoist ropes described in fixation is provided with the upside of described spring assembly, described hoist ropes passes through institute
The fixed plate stated, is provided with locking nut on the downside of described spring assembly, described spring assembly is fixed on described consolidating
Between fixed board and described locking nut, described spring assembly includes the first spring, is separately positioned on the first described spring
The spring pad of upper and lower both sides.
7. a kind of lift according to claim 6, it is characterised in that：Described lift also includes boot guiding device, institute
State lead boots rotated with described shoe including shoe, end be connected two wheel arm, be rotatably mounted at described wheel arm
The guide wheel of the other end, the boot guiding device also includes a guide rod, and the two ends of described guide rod are provided with stopper, described two
Wheel arm is arranged between two described stoppers, and two compression springs, the pressure described in two are additionally provided with described guide rod
Contracting spring is separately positioned between described stopper and described wheel arm, and the one end of described compression spring acts on described
Stopper, the other end acts on described wheel arm, and described two guide wheels for leading boots are clamped described under the action of the spring
Guide rail so that car can only be in the vertical motion of above-below direction, without vacillating now to the left, now to the right.
8. a kind of lift according to claim 7, it is characterised in that：Described counterweight includes framework, described
Framework includes the side frame for being located at both sides, the upper ledge and the lower frame that are arranged between the side frame described in two, is set in described framework
Have it is multiple be layered on top of each other to pouring weight, it is described to be provided with the through hole for running through up and down to pouring weight, described in multiple to pouring weight
Through hole is mutually aligned to form penetrating via, is provided with connecting screw rod in described penetrating via, the upper end of described connecting screw rod
Portion is connected with for by the fixing bolt being fixed on to pouring weight on framework described in multiple.
9. a kind of lift according to claim 8, it is characterised in that：Lead between described body side frame and described upper ledge
L-type fixture is crossed mutually to be fixedly connected, described fixture include the longitudinal side plate being mutually fixedly connected with described side frame and with institute
The horizontal side plate that the upper ledge stated mutually is fixedly connected, is provided with multiple cables, runs through for described multiple cables on described upper ledge
Rope hitch plate, described rope hitch plate is provided with multiple through holes run through for described cables, and described through hole is described in
The evenly distributed setting of length direction of rope hitch plate.
10. a kind of lift according to claim 9, it is characterised in that：The sidepiece of described side frame is additionally provided with multiple
Sliding block, the sidepiece of described side frame is provided with 4 sliding blocks, and 4 described sliding blocks are located at the top and bottom of two side-frames respectively,
The bottom of described lower frame is provided with the compensation block for hanging compensated chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611255943.4A CN106672761A (en) | 2016-12-30 | 2016-12-30 | Elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611255943.4A CN106672761A (en) | 2016-12-30 | 2016-12-30 | Elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106672761A true CN106672761A (en) | 2017-05-17 |
Family
ID=58872739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611255943.4A Pending CN106672761A (en) | 2016-12-30 | 2016-12-30 | Elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106672761A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110027972A (en) * | 2019-05-17 | 2019-07-19 | 南通通途机电制造有限公司 | A kind of hoist ropes disconnection early warning fall arrest elevator counterweight |
| US11040859B2 (en) | 2018-08-20 | 2021-06-22 | Otis Elevator Company | Frameless elevator counterweight |
| CN115214725A (en) * | 2022-07-14 | 2022-10-21 | 北京双泰气动设备有限公司 | Four-wheel clamping rail follow-up constant pressure traction device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201250037Y (en) * | 2008-07-17 | 2009-06-03 | 西子奥的斯电梯有限公司 | Elevator wire rope internal torque force releasing device |
| CN102869595A (en) * | 2010-05-14 | 2013-01-09 | 奥的斯电梯公司 | Elevator system with rope sway mitigation |
| CN204751844U (en) * | 2015-07-20 | 2015-11-11 | 苏迅电梯有限公司 | Simple and easy elevator is to heavy |
| CN106044468A (en) * | 2015-04-02 | 2016-10-26 | 株式会社日立制作所 | Elevator guide device |
| CN106241562A (en) * | 2015-06-04 | 2016-12-21 | 株式会社日立制作所 | Elevator and the air pressure control method of elevator |
-
2016
- 2016-12-30 CN CN201611255943.4A patent/CN106672761A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201250037Y (en) * | 2008-07-17 | 2009-06-03 | 西子奥的斯电梯有限公司 | Elevator wire rope internal torque force releasing device |
| CN102869595A (en) * | 2010-05-14 | 2013-01-09 | 奥的斯电梯公司 | Elevator system with rope sway mitigation |
| CN106044468A (en) * | 2015-04-02 | 2016-10-26 | 株式会社日立制作所 | Elevator guide device |
| CN106241562A (en) * | 2015-06-04 | 2016-12-21 | 株式会社日立制作所 | Elevator and the air pressure control method of elevator |
| CN204751844U (en) * | 2015-07-20 | 2015-11-11 | 苏迅电梯有限公司 | Simple and easy elevator is to heavy |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11040859B2 (en) | 2018-08-20 | 2021-06-22 | Otis Elevator Company | Frameless elevator counterweight |
| CN110027972A (en) * | 2019-05-17 | 2019-07-19 | 南通通途机电制造有限公司 | A kind of hoist ropes disconnection early warning fall arrest elevator counterweight |
| CN115214725A (en) * | 2022-07-14 | 2022-10-21 | 北京双泰气动设备有限公司 | Four-wheel clamping rail follow-up constant pressure traction device |
| CN115214725B (en) * | 2022-07-14 | 2023-12-22 | 北京双泰气动设备有限公司 | Traction device with four-wheel clamping rail follow-up constant pressure |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170517 |
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