CN114536533A - Tower crane counter weight making devices - Google Patents

Tower crane counter weight making devices Download PDF

Info

Publication number
CN114536533A
CN114536533A CN202210215535.5A CN202210215535A CN114536533A CN 114536533 A CN114536533 A CN 114536533A CN 202210215535 A CN202210215535 A CN 202210215535A CN 114536533 A CN114536533 A CN 114536533A
Authority
CN
China
Prior art keywords
tower crane
push rod
electric push
lower extreme
frame
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
Application number
CN202210215535.5A
Other languages
Chinese (zh)
Inventor
张景永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinan Hengqi Construction Machinery Co ltd
Original Assignee
Jinan Hengqi Construction Machinery Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jinan Hengqi Construction Machinery Co ltd filed Critical Jinan Hengqi Construction Machinery Co ltd
Priority to CN202210215535.5A priority Critical patent/CN114536533A/en
Publication of CN114536533A publication Critical patent/CN114536533A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215Feeding the moulding material in measured quantities from a container or silo
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B17/00Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/067Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

The invention provides a device for manufacturing a tower crane counterweight, and relates to the technical field of tower cranes. This based on tower crane counter weight making devices, including a supporting bench, the left end of brace table runs through and is provided with the shifting chute, and is provided with second electric putter at the left end portion, second electric putter's left end is provided with the slider, the left end of slider is provided with the alignment jig, the right-hand member of alignment jig runs through and is provided with the adjustment chute, the upper end of alignment jig just runs through for the inside of adjustment chute and is provided with the motor, the lower extreme of motor extends there is the motor shaft, and the lower extreme of motor shaft is provided with the lead screw, the lead screw runs through and is provided with the movable block, movable block and lead screw threaded connection, the one end of movable block is provided with the carriage, the upper end of carriage is provided with the concrete box, the lower extreme of concrete box is provided with the delivery pump, the lower extreme of delivery pump is provided with the passage. Through the device, can high-efficiently make the use to the tower crane counter weight.

Description

Tower crane counterweight manufacturing device
Technical Field
The invention relates to the technical field of tower cranes, in particular to a device for manufacturing a tower crane counterweight.
Background
The tower crane is the most common hoisting equipment in construction sites, and is used for hoisting construction raw materials such as reinforcing steel bars, wood ridges, concrete, steel pipes and the like for construction. The tower crane is an indispensable device on a construction site. The tower crane tip has the function of bearing the upper load transmitted by the boom pull rope and the balance arm pull rope, and directly transmits the upper load to the tower body structure through the rotary tower, the rotary table, the bearing seat and other structural components. The self-elevating tower top is provided with a truncated cone column type, a forward-inclined or backward-inclined truncated cone column type, a herringbone frame type and an inclined support frame type. The upper slewing tower crane is required to be provided with a balance weight, and the function of the upper slewing tower crane is to support the balance weight so as to form a balance moment which is required by design and has the action direction opposite to the lifting moment direction. In addition to the counterweight, a hoisting mechanism is often provided at the tail. The hoisting mechanism and the balance weight are arranged at the tail end of the balance arm together, so that partial balance weight function can be achieved, and the distance between the rope reel and the tower tip guide wheel is increased, so that the steel wire rope can be conveniently wound and rope disorder is avoided.
In the prior art, the manufacturing device for the tower crane counterweight has the defects of time and labor consumption, enhanced use and operation strength and lower manufacturing convenience, and compared with the prior art, the manufacturing device for the tower crane counterweight can be efficiently manufactured and used, the manufacturing convenience is improved, multi-angle adjustment manufacturing is effectively performed, the manufacturing efficiency is effectively improved, and the use strength of operators is effectively reduced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a device for manufacturing a tower crane counterweight, which solves the problem of inconvenience in manufacturing the tower crane counterweight.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the tower crane counterweight manufacturing device comprises a supporting table, wherein buffer structures are arranged on two sides of the lower end of the supporting table, a moving groove is formed in the left end of the supporting table in a penetrating mode, a second electric push rod is arranged at the left end of the supporting table, a sliding block is arranged at the left end of the second electric push rod, an adjusting frame is arranged at the left end of the sliding block, an adjusting groove is formed in the right end of the adjusting frame in a penetrating mode, a motor is arranged at the upper end of the adjusting frame in a penetrating mode and corresponds to the inside of the adjusting groove, a motor shaft extends from the lower end of the motor, a lead screw is arranged at the lower end of the motor shaft and is provided with a moving block in a penetrating mode, the moving block is in threaded connection with the lead screw, and a supporting frame is arranged at the right end of the moving block;
the utility model discloses a concrete feeding device, including a supporting frame, supporting bench, stand, supporting frame, the supporting frame runs through and is provided with the sliding opening, the upper end of supporting frame is provided with the concrete box, the lower extreme of concrete box is provided with the delivery pump, the lower extreme of delivery pump is provided with the passage, the side all runs through and is provided with the resettlement groove around the upper end of supporting bench, the inside lower extreme both sides of resettlement groove all are provided with third electric putter, third electric putter's upper end is provided with the lifter plate, the upper end of lifter plate is provided with the upper shed iron box.
Preferably, a control device is provided on the front end surface of the support table.
Preferably, buffer structure includes the supporting seat, the lower extreme of supporting seat is run through and is provided with the dashpot, the inside upper end of dashpot is provided with the telescopic link, the telescopic link is provided with a plurality ofly and equidistant range.
Preferably, the side of the lower end of the telescopic rod is provided with a spring, the lower end of the telescopic rod is provided with a buffer plate, and the lower end of the buffer plate is provided with universal wheels.
Preferably, the lower end of the inside of the adjusting groove is provided with a bearing, and an inner sleeve of the bearing is connected with the lower end of the screw rod.
Preferably, the right end of the supporting frame is provided with a first electric push rod in a penetrating mode, and one end of the first electric push rod is connected with the delivery pump.
Preferably, a fixing block is arranged on the side face of the third electric push rod, and the lower end of the fixing block is connected with the lower end of the interior of the placement groove.
Preferably, a protective cover is arranged on the outer surface of the second electric push rod.
(III) advantageous effects
The invention provides a device for manufacturing a tower crane counterweight. The method has the following beneficial effects:
1. according to the tower crane counterweight manufacturing device, the second electric push rod drives the sliding block to move back and forth, so that the back and forth position of the adjusting frame is adjusted, the back and forth use position of the material guide pipe is adjusted, effective concrete introduction is used, the motor at the adjusting frame drives the lead screw to rotate, the moving block is adjusted in the vertical height direction, the use height of the supporting frame is adjusted, the use height of the material guide pipe is adjusted, the use depth of the upper opening iron box is adapted, effective concrete introduction is carried out, counterweight manufacturing is used, and the use efficiency is effectively improved.
2. According to the tower crane counterweight manufacturing device, the horizontal using positions of the delivery pump and the concrete box are adjusted through the first electric push rod, so that the material guide pipe uniformly guides concrete into the upper opening iron box for forming use, and the uniform effect of the counterweight is improved.
3. According to the tower crane counterweight manufacturing device, after the counterweight is manufactured, the lifting plate is driven by the third electric push rod to adjust the use height of the upper opening iron box, so that the upper opening iron box can be conveniently moved to use, and the use convenience is improved.
4. According to the tower crane counterweight manufacturing device, the supporting table is formed through the buffer structure, and when the supporting table moves through the universal wheels, the supporting table is used for buffer protection, so that the use stability is improved.
Drawings
FIG. 1 is an external view of a device for manufacturing a tower crane counterweight according to the present invention;
FIG. 2 is a schematic structural diagram of an adjusting bracket of the tower crane counterweight manufacturing device of the invention;
FIG. 3 is a left end view of a support table of the apparatus for fabricating a tower crane counterweight according to the present invention;
FIG. 4 is a schematic view of the internal structure of a support table of the apparatus for manufacturing a tower crane counterweight according to the present invention;
FIG. 5 is a front view of a support frame of the tower crane counterweight making apparatus of the present invention;
FIG. 6 is a schematic view of a buffering structure of the tower crane counterweight manufacturing device of the present invention.
Wherein, 1, a protective cover; 2. a support table; 3. a control device; 4. a universal wheel; 5. an adjusting bracket; 6. a support frame; 7. an electric motor; 8. a concrete box; 9. a material guide pipe; 10. a sliding port; 11. a first electric push rod; 12. a placing groove; 13. an iron box with an upper opening; 14. a moving block; 15. an adjustment groove; 16. a bearing; 17. a lead screw; 18. a moving groove; 19. a slider; 20. a second electric push rod; 21. a third electric push rod; 22. a fixed block; 23. a lifting plate; 24. a delivery pump; 25. a buffer structure; 251. a telescopic rod; 252. a buffer tank; 253. a spring; 254. a buffer plate; 255. and (4) supporting the base.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 6, an embodiment of the invention provides a tower crane counterweight manufacturing device, which includes a support table 2, a control device 3 is disposed on a front end surface of the support table 2, a moving groove 18 is disposed at a left end of the support table 2 in a penetrating manner, a second electric push rod 20 is disposed at a left end portion of the support table, a protective cover 1 is disposed on an outer surface of the second electric push rod 20, a slider 19 is disposed at a left end of the second electric push rod 20, an adjusting frame 5 is disposed at a left end of the slider 19, the slider 19 is driven by the second electric push rod 20 to move forward and backward, so as to adjust a forward and backward position of the adjusting frame 5, so as to adjust a forward and backward use position of a material guiding pipe 9, so as to effectively guide and use concrete, an adjusting groove 15 is disposed at a right end of the adjusting frame 5 in a penetrating manner, a motor 7 is disposed at an upper end of the adjusting frame 5 and in an inner portion of the adjusting groove 15, and a motor shaft extends from a lower end of the motor 7, a lead screw 17 is arranged at the lower end of the motor shaft, a moving block 14 penetrates through the lead screw 17, the moving block 14 is in threaded connection with the lead screw 17, a bearing 16 is arranged at the lower end inside an adjusting groove 15, an inner sleeve of the bearing 16 is connected with the lower end of the lead screw 17, a supporting frame 6 is arranged at the right end of the moving block 14, the motor 7 at the adjusting frame 5 drives the lead screw 17 to rotate, so that the moving block 14 is adjusted in the vertical height, the using height of the supporting frame 6 is adjusted, the using height of the guide pipe 9 is adjusted, the using depth of the upper opening iron box 13 is adapted, concrete is effectively guided in, and balance weight manufacturing and using are carried out;
a sliding opening 10 is arranged in a support frame 6 in a penetrating way, a concrete box 8 is arranged at the upper end of the support frame 6, a delivery pump 24 is arranged at the lower end of the concrete box 8, a first electric push rod 11 is arranged at the right end of the support frame 6 in a penetrating way, one end of the first electric push rod 11 is connected with the delivery pump 24, a material guide pipe 9 is arranged at the lower end of the delivery pump 24, the horizontal using position of the delivery pump 24 and the concrete box 8 is adjusted through the first electric push rod 11, so that the material guide pipe 9 can uniformly guide concrete into the upper opening iron box 13 for molding use, a placing groove 12 is arranged at the front side and the rear side of the upper end of a support platform 2 in a penetrating way, third electric push rods 21 are arranged at two sides of the lower end of the interior of the placing groove 12, a fixing block 22 is arranged at the side surface of the third electric push rod 21, the lower end of the fixing block 22 is connected with the lower end of the interior of the placing groove 12, a lifting plate 23 is arranged at the upper end of the third electric push rod 21, the upper end of the lifting plate 23 is provided with the upper opening iron box 13, and after the balance weight is manufactured, the lifting plate 23 is driven by the third electric push rod 21 to adjust the use height of the upper opening iron box 13, so that the upper opening iron box 13 can be conveniently moved to use, and the use convenience is improved;
the lower extreme both sides of propping up supporting bench 2 all are provided with buffer structure 25, buffer structure 25 includes supporting seat 255, the lower extreme of supporting seat 255 runs through and is provided with dashpot 252, the inside upper end of dashpot 252 is provided with telescopic link 251, telescopic link 251 is provided with a plurality of and equidistant range, the lower extreme side of telescopic link 251 is provided with spring 253, the lower extreme of telescopic link 251 is provided with buffer board 254, the lower extreme of buffer board 254 is provided with universal wheel 4, form supporting bench 2 through buffer structure 25 when carrying out position shift through universal wheel 4, carry out the buffering protection and use, and the stability in use is improved.
The working principle is as follows: the second electric push rod 20 drives the sliding block 19 to move back and forth to adjust the back and forth position of the adjusting frame 5, the guide pipe 9 is adjusted back and forth using position, effective concrete introduction is used, the motor 7 at the adjusting frame 5 drives the screw rod 17 to rotate, the moving block 14 is adjusted up and down to adjust the using height of the supporting frame 6, the guide pipe 9 is adjusted to use, the using depth of the upper opening iron box 13 is adapted, effective concrete introduction is carried out, counterweight manufacturing is used, the first electric push rod 11 is used for adjusting the using horizontal position of the conveying pump 24 and the concrete box 8, the guide pipe 9 uniformly introduces the concrete into the upper opening iron box 13 to be molded, after counterweight manufacturing is finished, drive lifter plate 23 through third electric putter 21 and come to adjust the use height of upper shed iron box 13 to be convenient for carry out position removal to upper shed iron box 13 and use, well-stood up and use the convenience.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. Tower crane counter weight making devices, including brace table (2), its characterized in that: the two sides of the lower end of the supporting platform (2) are respectively provided with a buffer structure (25), the left end of the supporting platform (2) is provided with a moving groove (18) in a penetrating way, a second electric push rod (20) is arranged at the left end part, a slide block (19) is arranged at the left end of the second electric push rod (20), an adjusting frame (5) is arranged at the left end of the sliding block (19), an adjusting groove (15) is arranged at the right end of the adjusting frame (5) in a penetrating way, an electric motor (7) penetrates through the upper end of the adjusting frame (5) and is arranged in the adjusting groove (15), a motor shaft extends from the lower end of the electric motor (7), a lead screw (17) is arranged at the lower end of the motor shaft, a moving block (14) is arranged through the lead screw (17), the moving block (14) is in threaded connection with a lead screw (17), and a supporting frame (6) is arranged at the right end of the moving block (14);
the utility model discloses a concrete storage tank, including bearing frame (6), carriage (6), baffle pipe (9), stand table (2), the lower extreme of bearing frame (6) runs through and is provided with spout (10), the upper end of bearing frame (6) is provided with concrete box (8), the lower extreme of concrete box (8) is provided with delivery pump (24), the lower extreme of delivery pump (24) is provided with passage (9), the side all runs through around the upper end of brace table (2) and is provided with resettlement groove (12), the inside lower extreme both sides of resettlement groove (12) all are provided with third electric putter (21), the upper end of third electric putter (21) is provided with lifter (23), the upper end of lifter (23) is provided with upper shed iron box (13).
2. The tower crane counterweight making device according to claim 1, characterized in that: the front end face of the support table (2) is provided with a control device (3).
3. The tower crane counterweight manufacturing device according to claim 1, wherein: buffer structure (25) include supporting seat (255), the lower extreme of supporting seat (255) is run through and is provided with buffer slot (252), the inside upper end of buffer slot (252) is provided with telescopic link (251), telescopic link (251) are provided with a plurality ofly and equidistant range.
4. The tower crane counterweight manufacturing device according to claim 3, wherein: the side face of the lower end of the telescopic rod (251) is provided with a spring (253), the lower end of the telescopic rod (251) is provided with a buffer plate (254), and the lower end of the buffer plate (254) is provided with a universal wheel (4).
5. The tower crane counterweight manufacturing device according to claim 1, wherein: the lower end of the inside of the adjusting groove (15) is provided with a bearing (16), and an inner sleeve of the bearing (16) is connected with the lower end of a screw rod (17).
6. The tower crane counterweight manufacturing device according to claim 1, wherein: the right end of the supporting frame (6) is provided with a first electric push rod (11) in a penetrating mode, and one end of the first electric push rod (11) is connected with the conveying pump (24).
7. The tower crane counterweight manufacturing device according to claim 1, wherein: a fixing block (22) is arranged on the side face of the third electric push rod (21), and the lower end of the fixing block (22) is connected with the lower end of the interior of the placement groove (12).
8. The tower crane counterweight manufacturing device according to claim 1, wherein: and a protective cover (1) is arranged on the outer surface of the second electric push rod (20).
CN202210215535.5A 2022-03-07 2022-03-07 Tower crane counter weight making devices Pending CN114536533A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210215535.5A CN114536533A (en) 2022-03-07 2022-03-07 Tower crane counter weight making devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210215535.5A CN114536533A (en) 2022-03-07 2022-03-07 Tower crane counter weight making devices

Publications (1)

Publication Number Publication Date
CN114536533A true CN114536533A (en) 2022-05-27

Family

ID=81662413

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210215535.5A Pending CN114536533A (en) 2022-03-07 2022-03-07 Tower crane counter weight making devices

Country Status (1)

Country Link
CN (1) CN114536533A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140076937A (en) * 2012-12-13 2014-06-23 강남훈 3D precast slab track manufacturing device
CN211306666U (en) * 2019-12-26 2020-08-21 杭州尊狐包装制品有限公司 Automatic forming machine for wooden box packaging edge strips
CN113246260A (en) * 2021-05-13 2021-08-13 赵军民 Cement prefabricated part pouring forming system
CN113263089A (en) * 2021-04-27 2021-08-17 惠州市乐达智能自动化有限公司 Hardware die machining device and method
CN113547680A (en) * 2021-08-09 2021-10-26 陕西中科非开挖技术股份有限公司 High pressure resistant pipeline inside lining forming device
CN215671155U (en) * 2021-09-18 2022-01-28 四川省凡灯环保科技有限责任公司 Vibration device for assembly type building
CN215791118U (en) * 2021-08-05 2022-02-11 莆田浩步鞋业有限公司 Injection molding device for sole production and processing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140076937A (en) * 2012-12-13 2014-06-23 강남훈 3D precast slab track manufacturing device
CN211306666U (en) * 2019-12-26 2020-08-21 杭州尊狐包装制品有限公司 Automatic forming machine for wooden box packaging edge strips
CN113263089A (en) * 2021-04-27 2021-08-17 惠州市乐达智能自动化有限公司 Hardware die machining device and method
CN113246260A (en) * 2021-05-13 2021-08-13 赵军民 Cement prefabricated part pouring forming system
CN215791118U (en) * 2021-08-05 2022-02-11 莆田浩步鞋业有限公司 Injection molding device for sole production and processing
CN113547680A (en) * 2021-08-09 2021-10-26 陕西中科非开挖技术股份有限公司 High pressure resistant pipeline inside lining forming device
CN215671155U (en) * 2021-09-18 2022-01-28 四川省凡灯环保科技有限责任公司 Vibration device for assembly type building

Similar Documents

Publication Publication Date Title
CN209881225U (en) Trolley for mounting cable trough box
CN110436355A (en) A kind of mechanical engineering Multi-functional suspension equipment
CN104386588B (en) At deep-well environment radiation appliance is remotely controlled and safeguards special lifting three-axis platform
CN204224186U (en) Fork truck
CN108750961B (en) Crane convenient to move
CN114536533A (en) Tower crane counter weight making devices
CN211366748U (en) U-shaped cement tank hoisting mechanism
CN111994809A (en) Deep basal pit section of jurisdiction installation guiding device
CN210558998U (en) Steel construction section bar lifting device
CN210563301U (en) Concrete pouring workbench for house construction
CN104310279A (en) Forklift
CN207288471U (en) A kind of interlocked numerical controlled plate bending machine of dual stage
CN207107926U (en) Lift material-strewing device
CN212355317U (en) Angle-adjustable inclined construction elevator
CN112209283B (en) Construction is with mechanical lifting means of operation of being convenient for
CN210048399U (en) Crane convenient to height-adjusting
CN114455486A (en) Tensile counterweight balance tower crane
CN112678717A (en) Light hoister
CN208261833U (en) A kind of molten iron forging loading and unloading robot
CN217148437U (en) Quick lifting means of building material transportation usefulness
CN200940337Y (en) Direct current speed reducing wall whitewashing machine
CN214641447U (en) Numerical control steel bar bending center shaping and welding device
CN110790153A (en) Mechanical lifting type engineering machinery transfer device
CN214976884U (en) Bending device is used in steel construction production
CN214611167U (en) Operation platform for hoisting concrete prefabricated part

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination