CN214944738U - Locking dish convenient to production and processing - Google Patents

Locking dish convenient to production and processing Download PDF

Info

Publication number
CN214944738U
CN214944738U CN202120497903.0U CN202120497903U CN214944738U CN 214944738 U CN214944738 U CN 214944738U CN 202120497903 U CN202120497903 U CN 202120497903U CN 214944738 U CN214944738 U CN 214944738U
Authority
CN
China
Prior art keywords
ring
disc
locking
hole
correspondingly
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.)
Active
Application number
CN202120497903.0U
Other languages
Chinese (zh)
Inventor
白坤
宫平声
李振
鲜继红
闫燕
张国栋
黎亮
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.)
Luoyang Pneumatic Tool Co ltd
Original Assignee
Luoyang Pneumatic Tool 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 Luoyang Pneumatic Tool Co ltd filed Critical Luoyang Pneumatic Tool Co ltd
Priority to CN202120497903.0U priority Critical patent/CN214944738U/en
Application granted granted Critical
Publication of CN214944738U publication Critical patent/CN214944738U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

A locking disc convenient to produce and process relates to the technical field of wind power generation equipment, and is used for locking a shaft sleeve body and a main shaft body, wherein one end of the main shaft body is coaxially inserted into the shaft sleeve body; an inner ring is sleeved on the sleeve body of the shaft sleeve body, the outer edge of the inner ring is of a conical structure, and the central hole of the outer ring is a conical hole correspondingly matched with the conical outer edge of the inner ring; the large end of the inner ring is provided with a connecting disc which is correspondingly and fixedly connected with the corresponding end surface of the shaft sleeve body, the connecting disc is of an annular structure, a plurality of mounting holes are formed in the connecting disc at intervals and in a ring shape, the outer side of the inner ring is corresponding to the connecting disc, locking screws which are correspondingly and fixedly connected with the outer ring are mounted in the mounting holes, and the large end surface of the inner ring is correspondingly abutted against the connecting disc; the utility model discloses simple structure, easily assembly, manufacturing cost is lower, compares with traditional locking dish structure, very big improvement machining efficiency, can effectively reduce the processing cost.

Description

Locking dish convenient to production and processing
Technical Field
The utility model belongs to the technical field of wind power generation equipment technique and specifically relates to a locking dish convenient to production and processing is related to.
Background
The locking disc is an important component of a transmission system of a wind generating set, and is also called a wind power contraction disc, the locking disc mainly comprises an inner ring, an outer ring and bolts, a flange and an outer conical surface are arranged on the outer circle of the inner ring of the traditional locking disc, and the flange is provided with screw through holes which are as many as the screw through holes corresponding to the threaded holes on the step of the outer ring; due to the characteristics of the structural shape of the inner ring, the structure of the inner ring is only about 20% of the total amount of the blank, the waste of steel is huge, the processing consumable material accounts for a high ratio, and the processing time is long; in addition, the traditional locking disc is limited to the structural influence, so that the installation and disassembly processes are complex, time and labor are consumed, and the phenomenon is a problem to be solved urgently by a technical staff in the field;
the prior patent discloses a wind-powered electricity generation locking dish inner ring tang clamping component device, the inner ring tip of this patent sets up the inner ring flange, sets up the tang joint between inner ring flange and the inner ring, though this patent inner ring and inner ring flange can be processed respectively, practice thrift steel, but this patent need pass through inner ring tang card key connection with inner ring and inner ring flange and just can use as an organic whole, and assembly process is complicated, and it is inconvenient to use.
Disclosure of Invention
In order to overcome the not enough in the background art, the utility model discloses a locking dish convenient to production and processing.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a locking disc convenient to produce and process is used for locking a shaft sleeve body and a main shaft body, wherein one end of the main shaft body is coaxially inserted into the shaft sleeve body, and the locking disc further comprises an outer ring, an inner ring and a connecting disc; an inner ring is sleeved on the sleeve body of the shaft sleeve body, the outer edge of the inner ring is of a conical structure, and the central hole of the outer ring is a conical hole correspondingly matched with the conical outer edge of the inner ring; the large end of the inner ring is provided with a connecting disc which is correspondingly and fixedly connected with the corresponding end surface of the shaft sleeve body, the connecting disc is of an annular structure, a plurality of mounting holes are formed in the connecting disc at intervals and in a ring shape, the outer side of the inner ring is corresponding to the connecting disc, locking screws which are correspondingly and fixedly connected with the outer ring are mounted in the mounting holes, and the large end surface of the inner ring is correspondingly abutted against the connecting disc; the connecting disc quotation is equipped with the jackscrew hole, and the jackscrew hole and locking screw mutually noninterfere influence.
Preferably, the connecting disc is correspondingly and fixedly connected with the shaft sleeve body through a positioning piece.
Preferably, the positioning parts can be arranged in a plurality of rings, or the positioning parts are of a circular ring structure, or the positioning parts and the connecting disc are of an integrated structure.
Preferably, one end of the connecting disc, corresponding to the inner ring, is provided with a sinking groove which is coaxial with the connecting disc, and the bottom of the sinking groove is provided with a screw which is correspondingly and fixedly connected with the end face of the corresponding end of the shaft sleeve body.
Preferably, the end face of the big end of the inner ring is provided with an oil filling hole I communicated with the joint surface of the inner ring and the outer ring, a through hole is formed in the position, corresponding to the oil filling hole I, of the connecting disc, or the end face of the big aperture end of the outer ring or the outer edge of the outer ring is provided with an oil filling hole II communicated with the joint surface of the inner ring and the outer ring.
Preferably, a ring groove I is formed in the position, corresponding to the oil injection hole I, of the outer edge of the inner ring; or the inner edge of the outer ring is provided with an annular groove II at a position corresponding to the oil injection hole II.
Preferably, oil filler point I and oil filler point II are a plurality of, and the equipartition sets up.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:
the utility model discloses a locking dish convenient to production and processing, simple structure, easily assembly, manufacturing cost is lower, compares with traditional locking dish structure, and the inner ring can directly utilize the pipe to carry out the shaping processing, very big improvement machining efficiency, improved material utilization simultaneously, can effectively reduce the processing cost, and the big aperture end of outer loop centre bore need not to process the heavy groove, under the prerequisite that provides equal transmission torque, can reduce the external diameter size of outer loop, saves material, lightens weight;
in addition, the big end face of the inner ring is provided with an oil filling hole I communicated with the junction surface of the inner ring and the outer ring, or the big diameter end face of the outer ring or the outer edge of the outer ring is provided with an oil filling hole II communicated with the junction surface of the inner ring and the outer ring.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a conventional locking disk;
FIG. 3 is a schematic structural view of a positioning member;
FIG. 4 is another structural diagram of the connecting disc;
FIG. 5 is a schematic structural view of the oil filler hole I;
FIG. 6 is a first structural view of a filler point II;
FIG. 7 is a second structural view of the oil filler hole II;
fig. 8 is a structural schematic diagram of the locking state of the present invention;
fig. 9 is a schematic diagram of torque transmission according to the present invention;
fig. 10 is a schematic view of torque transmission of a conventional locking disk.
In the figure: 1. a shaft sleeve body; 2. a main shaft body; 3. an outer ring; 4. an inner ring; 5. a connecting disc; 6. locking the screw; 7. a positioning member; 8. a jackscrew hole; 9. an oil filling hole I; 10. and an oil filling hole II.
Detailed Description
The present invention will be explained in detail by the following embodiments, and it is to be understood that the present invention is intended to protect all technical improvements within the scope of the present invention, and in the description of the present invention, it is to be understood that if there are the terms "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, it is only corresponding to the drawings of the present application, and for the convenience of description of the present invention, it is not intended to indicate or imply that the device or element referred to must have a specific orientation.
With reference to the attached drawings 1-8, the locking disc convenient to produce and process is used for locking a shaft sleeve body 1 and a main shaft body 2, one end of the main shaft body 2 is coaxially inserted into the shaft sleeve body 1, and the locking disc further comprises an outer ring 3, an inner ring 4 and a connecting disc 5; an inner ring 4 is sleeved on the sleeve body of the shaft sleeve body 1, the outer edge of the inner ring 4 is of a conical structure, and the central hole of the outer ring 3 is a conical hole correspondingly matched with the conical outer edge of the inner ring 4; an annular connecting disc 5 is arranged at the large end of the inner ring 4, a plurality of mounting holes are formed in the connecting disc 5 at intervals corresponding to the outer side of the inner ring 4, locking screws 6 which are correspondingly and fixedly connected with the outer ring 3 are arranged in the mounting holes, the large end face of the inner ring 4 is correspondingly abutted to the connecting disc 5, namely the outer ring 3 can be pulled through the locking screws 6 when the spindle is used, so that the outer ring 3 and the inner ring 4 generate relative axial displacement, an inner conical surface of the outer ring 3 is combined with an outer conical surface of the inner ring 4, the axial force applied to the outer ring 3 by the locking screws 6 is converted into a radial tightening force applied to the inner ring 4 by the outer ring 3, and the inner ring 4 generates corresponding reducing deformation until the spindle body 2 is locked by the spindle sleeve body 1;
compared with the traditional locking disc structure, the inner ring 4 can be directly formed and processed by using a circular tube, so that the processing efficiency is greatly improved, the material utilization rate is improved, the processing cost can be effectively reduced, a large-hole-diameter end of a central hole of the outer ring 3 is not required to be processed with a sink groove, the outer diameter size of the outer ring 3 can be reduced under the condition of providing the same transmission torque, the material is saved, and the weight is reduced;
with reference to fig. 9 to 10, for example, in a product, the diameter di (mm) =100 of the inner hole of the spindle body 2, the matching diameter dw (mm) =690H7/g6 of the spindle body 2 and the sleeve body 1, and the matching diameter d (mm) = 800H 7/f7 of the sleeve body 1 and the locking disc;
if the locking disk for the wind driven generator is adopted, the outer diameter d (mm) =1205 of the outer ring 3, the width l (mm) =296 of the inner ring 4, the average diameter df (mm) =827.959 of the inner and outer ring conical surfaces, the bevel angle alpha (°) =2.7 of the inner and outer ring conical surfaces, and the stroke h (mm) =39.35 of the inner and outer rings is 1601 Kg;
uw =3.7114mm (taper section interference) can be calculated according to the stroke;
the transmission torque it can provide:
Δ dwmax (mm) (maximum clearance between spindle and sleeve) =0.154
Δ dmax (mm) (maximum clearance between sleeve and locking disk) =0.24
P2=222.41MPa
Pa= 219.101MPa
Pw=212.787MPa
Mt=π*dw^2*L*uw*Pw/2= 7065.565kN.m;
If a traditional locking disc is adopted to provide equal transmission torque, the outer diameter D (mm) =1270 of an outer ring, the total width L (mm) =296 of an inner ring, the width L1(mm) =55 of a first section of the inner ring, the average diameter df1(mm) =969.784 of the first section of the inner ring, the width L2(mm) =241 of a second section of the inner ring, the average diameter df2(mm) =825.365 of the second section of the inner ring, the bevel angle alpha (°) =2.7 of an inner-outer ring conical surface, the stroke H (mm) =39.5 of the inner-outer ring, the gap between an inner-outer ring flange and an outer ring flange is 0.2mm, and the weight is 1800 Kg;
the following can be calculated according to the stroke and the clearance between the inner ring flange and the outer ring flange:
uw1=3.3255mm (interference at the position of the inner and outer ring flanges)
Uw2=3.7255mm (interference of long cone segment)
The transmission torque it can provide:
Δ dwmax (mm) (maximum clearance between spindle and sleeve) =0.154
Δ dmax (mm) (maximum clearance between sleeve and locking disk) =0.24
Calculating in two sections:
first section (inner and outer ring flange position)
P21=135.407MPa
Pa1= 119.986MPa
Pw1=114.215MPa
Mt1=π*dw^2*L1*uw*Pw1/2= 704.682kN.m
Second section (Long conical section)
P22=244.919MPa
Pa2= 241.881MPa
Pw2=235.443MPa
Mt2=π*dw^2*L2*uw*Pw2/2= 6365.213kN.m
The total transferable torque is added in two stages:
mt = Mt1+ Mt2=7069.895kn.m, provides equal 7069.895kn.m transmission torque promptly, the utility model discloses an outer 3 external diameters of outer ring are less than traditional locking dish outer ring external diameter, and weight can alleviate 11%.
The first embodiment is as follows:
an outer ring 3, an inner ring 4 and a connecting disc 5 are coaxially sleeved on the sleeve body of the shaft sleeve body 1 in sequence; a locking screw 6 is arranged in a mounting hole of the connecting disc 5, the outer ring 3 is pulled through the locking screw 6, so that the inner conical surface of the outer ring 3 is combined with the outer conical surface of the inner ring 4, the axial force applied to the outer ring 3 by the locking screw 6 is converted into the radial tightening force applied to the inner ring 4 by the outer ring 3, and the main shaft body 2 is locked by the shaft sleeve body 1; during disassembly, the locking screws 6 can be loosened to disengage the outer ring 3 from the inner ring 4.
Example two:
the connecting disc 5 is correspondingly sleeved with the sleeve body of the shaft sleeve body 1, a positioning piece 7 for positioning the connecting disc 5 is fixedly connected with one end face of the shaft sleeve body 1 corresponding to the connecting disc 5, a top thread hole 8 is formed in the disc face of the connecting disc 5, namely the connecting disc 5 and the shaft sleeve body 1 can be correspondingly and fixedly connected through the positioning piece 7, on one hand, the locking operation between the outer ring 3 and the inner ring 4 can be facilitated, the outer ring 3 and the inner ring 4 can be prevented from accidentally moving along the shaft sleeve body 1 before locking, so that the anti-loosening purpose is achieved, meanwhile, the position of the connecting disc 5 is fixed after the connecting disc 5 and the shaft sleeve body 1 are correspondingly and fixedly connected through the positioning piece 7, the outer ring 3 can only move close to the connecting disc 5 along the axial direction of the shaft sleeve body 1 during the locking operation, and the position of the connecting disc 5 on the sleeve body of the shaft sleeve body 1 can be changed by replacing the positioning pieces 7 with different sizes, thereby achieving the purpose of controlling the distance between one end of the outer ring 3 departing from the connecting disc 5 and the shaft sleeve body 1; on the other hand, during maintenance, if the outer ring 3 and the inner ring 4 are not separated after the locking screw 6 is disassembled, a jackscrew can be installed at the position of the jackscrew hole 8, so that the jackscrew is correspondingly abutted against the end surface of the corresponding end of the outer ring 3 and is continuously screwed, and the outer ring 3 and the inner ring 4 can be correspondingly separated by jacking the outer ring 3 through the jackscrew; according to the requirement, the positioning piece 7 is correspondingly and fixedly connected with the connecting disc 5, or the positioning piece 7 and the connecting disc 5 are in an integrated structure; the positioning pieces 7 can be arranged in a plurality of rings, or the positioning pieces 7 are of a circular ring structure, so that the installation is convenient, and the operation is simple.
Example three:
the connecting disc 5 corresponds the fastening with the corresponding end terminal of axle sleeve body 1 and connects, or the connecting disc 5 corresponds the one end of inner ring 4 and is equipped with the heavy groove that corresponds coaxial with connecting disc 5, and this heavy groove tank bottom is equipped with the screw that corresponds the fastening with the corresponding end terminal of axle sleeve body 1 and connects, connecting disc 5 quotation is equipped with jackscrew hole 8, can make connecting disc 5 and axle sleeve body 1 directly correspond the fastening and connect promptly, when overhauing and maintaining, if dismantle behind locking screw 6 outer loop 3 and inner ring 4 and do not throw off, can install the jackscrew in jackscrew hole 8 positions, make the jackscrew correspond with the corresponding end terminal of outer loop 3 and contradict and continue to screw up the jackscrew, push up outer loop 3 through the jackscrew, can make outer loop 3 and inner ring 4 correspond and throw off.
Example four:
an oil filling hole I9 communicated with a joint surface of the inner ring 4 and the outer ring 3 is formed in the end face of the large end of the inner ring 4, and a through hole is formed in the position, corresponding to the oil filling hole I9, of the connecting disc 5, namely when maintenance is carried out, if the outer ring 3 and the inner ring 4 are not separated after the locking screw 6 is disassembled, high-pressure oil or high-pressure grease can be injected into the joint surface of the inner ring 4 and the outer ring 3 through the oil filling hole I9 until the inner ring 4 and the outer ring 3 generate axial relative displacement, the outer ring 3 and the inner ring 4 can be separated correspondingly, the maintenance operation is facilitated, and the working efficiency of maintenance can be effectively improved; according to the requirement, the oil injection holes I9 are uniformly distributed, so that the pressure can be uniformly applied to the joint surface of the inner ring 4 and the outer ring 3, and the accidental blocking of the inner ring 4 and the outer ring 3 is avoided; the position that the 4 outer fringe of inner ring corresponds oil filler point I9 is equipped with annular I, when pouring into high-pressure oil or high-pressure grease into the faying face of inner ring 4 and outer loop 3 promptly, high-pressure oil or high-pressure grease can get into annular I, can increase the lifting surface area on the one hand, make outer loop 3 and inner ring 4 throw off more easily, and on the other hand can guarantee that the atress is even, makes outer loop 3 and inner ring 4 keep coaxial, avoids unexpected card to die.
Example five:
an oil injection hole II 10 communicated with a joint surface of the inner ring 4 and the outer ring 3 is formed in the end face of the large aperture end of the outer ring 3 or the outer edge of the outer ring 3, namely, when maintenance is carried out, if the outer ring 3 and the inner ring 4 are not separated after the locking screw 6 is disassembled, high-pressure oil or high-pressure grease can be injected into the joint surface of the inner ring 4 and the outer ring 3 through the oil injection hole II 10 until the inner ring 4 and the outer ring 3 generate axial relative displacement, the outer ring 3 and the inner ring 4 can be correspondingly separated, the maintenance operation is convenient, and the working efficiency of maintenance can be effectively improved; according to the requirement, the oil injection holes II 10 are uniformly distributed, so that the joint surface of the inner ring 4 and the outer ring 3 can be uniformly pressed, and the inner ring 4 and the outer ring 3 are prevented from being accidentally clamped; the inner edge of the outer ring 3 is provided with an annular groove II corresponding to the oil injection hole II 10, namely when high-pressure oil or high-pressure grease is injected into the joint surface of the inner ring 4 and the outer ring 3, the high-pressure oil or the high-pressure grease can enter the annular groove II, so that the stress area can be increased, the outer ring 3 and the inner ring 4 can be separated easily, the uniform stress can be ensured, the outer ring 3 and the inner ring 4 can be kept coaxial, and accidental blocking is avoided.
The part of the utility model not detailed is prior art.

Claims (8)

1. The utility model provides a locking dish convenient to production and processing for locking axle sleeve body (1) and main shaft body (2), coaxial grafting has the one end of main shaft body (2), characterized by in axle sleeve body (1): the device also comprises an outer ring (3), an inner ring (4) and a connecting disc (5); an inner ring (4) is sleeved on the sleeve body of the shaft sleeve body (1), the outer edge of the inner ring (4) is of a conical structure, and a central hole of the outer ring (3) is a conical hole correspondingly matched with the conical outer edge of the inner ring (4); a connecting disc (5) which is correspondingly and fixedly connected with the end face of the corresponding end of the shaft sleeve body (1) is installed at the big end of the inner ring (4), the connecting disc (5) is of an annular structure, a plurality of installing holes are annularly formed in the outer side of the connecting disc (5) corresponding to the inner ring (4) at intervals, locking screws (6) which are correspondingly and fixedly connected with the outer ring (3) are installed in the installing holes, and the end face of the big end of the inner ring (4) is correspondingly abutted against the connecting disc (5); the disc surface of the connecting disc (5) is provided with a jackscrew hole (8), and the jackscrew hole (8) and the locking screw (6) are not interfered mutually.
2. The locking disk of claim 1 which facilitates manufacturing operations, wherein: the connecting disc (5) is correspondingly and fixedly connected with the shaft sleeve body (1) through a positioning piece (7).
3. The locking disk of claim 2 which facilitates manufacturing operations, wherein: the positioning pieces (7) can be arranged in a plurality of rings, or the positioning pieces (7) are of a circular ring structure.
4. The locking disk of claim 2 which facilitates manufacturing operations, wherein: the positioning piece (7) and the connecting disc (5) are of an integrated structure.
5. The locking disk of claim 1 which facilitates manufacturing operations, wherein: one end of the connecting disc (5) corresponding to the inner ring (4) is provided with a sinking groove which is coaxial with the connecting disc (5), and the bottom of the sinking groove is provided with a screw which is fixedly connected with the corresponding end surface of the shaft sleeve body (1) in a corresponding manner.
6. The locking disk of claim 1 which facilitates manufacturing operations, wherein: the large-end face of the inner ring (4) is provided with an oil filling hole I (9) communicated to a joint face of the inner ring (4) and the outer ring (3), a through hole is formed in a position, corresponding to the oil filling hole I (9), of the connecting disc (5), or the large-aperture end face of the outer ring (3) or the outer edge of the outer ring (3) is provided with an oil filling hole II (10) communicated to a joint face of the inner ring (4) and the outer ring (3).
7. The locking disk facilitating the production process as set forth in claim 6, wherein: an annular groove I is formed in the position, corresponding to the oil injection hole I (9), of the outer edge of the inner ring (4); or the inner edge of the outer ring (3) is provided with a ring groove II at the position corresponding to the oil injection hole II (10).
8. The locking disk facilitating the production process as set forth in claim 6, wherein: oil filler point I (9) and oil filler point II (10) are a plurality of, and the equipartition sets up.
CN202120497903.0U 2021-03-09 2021-03-09 Locking dish convenient to production and processing Active CN214944738U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120497903.0U CN214944738U (en) 2021-03-09 2021-03-09 Locking dish convenient to production and processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120497903.0U CN214944738U (en) 2021-03-09 2021-03-09 Locking dish convenient to production and processing

Publications (1)

Publication Number Publication Date
CN214944738U true CN214944738U (en) 2021-11-30

Family

ID=79118778

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120497903.0U Active CN214944738U (en) 2021-03-09 2021-03-09 Locking dish convenient to production and processing

Country Status (1)

Country Link
CN (1) CN214944738U (en)

Similar Documents

Publication Publication Date Title
CN214944738U (en) Locking dish convenient to production and processing
CN202531671U (en) Hydraulic locking disk
CN112943544A (en) Locking disc for wind driven generator
CN105081014A (en) Straightening-ring locking device combining taper sleeve expansion and key transmission
CN214945859U (en) Locking dish convenient to dismantle and maintain
CN202251493U (en) Locking connecting flange
CN212584487U (en) Flange fast-assembling device
CN211449432U (en) Hydraulic locking disc
CN202607338U (en) Boring tool at end cover of speed reduction box
CN204912365U (en) Aligning circle locking device that taper sleeve expands tightly and keydrive combines together
CN202073941U (en) Expansion coupling sleeve
CN203696078U (en) Assembled milling cutter
CN204517312U (en) Wind power generation penetration pipe structure
CN212552531U (en) Detachable water supply pump body pipeline butt welding positioning tool
CN109555723B (en) Detachable impeller seal head structure for dredge pump
CN106763249A (en) A kind of assembly method of wind-power locking disc inner ring seam clip assembly device
US20200056641A1 (en) Assembly Method of Inner Ring Threaded-Connection Component Device of Wind-Power Locking Plate
CN209007474U (en) Steering tool is used in a kind of installation of composite fibre bearing
CN211116156U (en) Steam exhaust guide ring for steam turbine in power plant
CN215333744U (en) Novel press machine oil cylinder fixing structure
CN215444991U (en) Hand-operated power distribution device
CN214291760U (en) Hydraulic installation device for installing gear on cutter shaft of flying shear
CN202493824U (en) High-pressure expansion joint for steel structure
CN209903116U (en) Guide device for mounting large-sized nut
CN214402191U (en) Detachable connecting structure of composite material part and metal structural part

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant