CN209872109U - A jib frock for dismouting portal - Google Patents
A jib frock for dismouting portal Download PDFInfo
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- CN209872109U CN209872109U CN201920582643.XU CN201920582643U CN209872109U CN 209872109 U CN209872109 U CN 209872109U CN 201920582643 U CN201920582643 U CN 201920582643U CN 209872109 U CN209872109 U CN 209872109U
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Abstract
The utility model discloses a boom tool for dismounting a gantry, which comprises a main rod, a limiting component arranged inside the main rod and a turning component arranged at the lower part of the main rod; when the hanger rod is assembled and disassembled on the portal frame, the upper part of the main rod is connected with the hoisting equipment, the lower part of the main rod penetrates through a hoisting hole of an upper cross beam of the portal frame, the overturning assembly is positioned below the upper cross beam, and the lifting rod of the limiting assembly is positioned above the upper cross beam; the limiting assembly can move up and down in the main rod along the vertical direction; the turnover plate of the turnover assembly is limited by the positioning rod of the limiting assembly. The utility model discloses the jib frock includes mobile jib, spacing subassembly and upset subassembly, and overall structure is simple, convenient to use has reduced manufacturing and processing cost, and the jib frock can play good additional action at portal dismouting in-process, can also realize self breaking away from fast of portal entablature lifting eye, is favorable to using widely.
Description
Technical Field
The utility model relates to a portal dismouting technical field specifically is a jib frock for dismouting portal.
Background
In prior art, under the different operating modes, the customer needs the not portal of co-altitude, and at present, the highest portal of customer's demand has 6 meters more, and when the portal of on-the-spot dismouting 3 meters above, need use the jib frock.
And in the in-process of dismantling at the jib frock, need the workman to climb or the operation of ascending a height, the manual jib frock with higher portal breaks away from in the lifting eye of portal entablature, each one of the lifting eye bilateral symmetry of entablature, the workman dismantles wherein with the jib frock of lifting in-hole installation, need climb again to the opposite side and dismantle the jib frock of opposite side, there is very big potential safety hazard like this, simultaneously, more consume workman's physical power, dismantle every to have 5 minutes time at least that the jib frock is extravagant, lead to the dismantlement inefficiency of jib frock.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a jib frock for dismouting portal to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a boom tool for dismounting a gantry comprises a main rod, a limiting assembly arranged inside the main rod and an overturning assembly arranged at the lower part of the main rod;
when the hanger rod is assembled and disassembled on the portal frame, the upper part of the main rod is connected with the hoisting equipment, the lower part of the main rod penetrates through a hoisting hole of an upper cross beam of the portal frame, the overturning assembly is positioned below the upper cross beam, and the lifting rod of the limiting assembly is positioned above the upper cross beam;
the limiting assembly can move up and down in the main rod along the vertical direction;
the turnover plate of the turnover assembly is limited by the positioning rod of the limiting assembly.
As a further aspect of the present invention: the upper part of the main rod is longitudinally provided with a lifting through hole, and the bottom end of the main rod is longitudinally provided with an overturning hole;
the lifting through hole and the overturning hole are positioned on the same vertical line, the lifting through hole is a waist-shaped hole, and the overturning hole is a waist-shaped hole with an open lower end.
As a further aspect of the present invention: a cylindrical through hole is formed in the inner part of the main rod between the lifting through hole and the overturning hole along the longitudinal direction;
the cylindrical through hole is located in the middle of the inner part of the main rod.
As a further aspect of the present invention: a hoisting through hole is transversely formed at the position, close to the upper end, of the main rod, and a pin shaft hole is transversely formed at the position, close to the lower end, of the main rod;
the lifting through hole is located above the lifting through hole, the pin shaft hole is located in the middle of the turnover hole, and the depth direction of the pin shaft hole is perpendicular to the depth direction of the turnover hole.
As a further aspect of the present invention: the limiting assembly comprises a positioning rod and a lifting rod which are in a T-shaped structure;
the positioning rod longitudinally penetrates through the cylindrical through hole in the main rod, and the lifting rod is transversely placed in the lifting through hole in the upper part of the main rod;
the upper part of the positioning rod is connected with the middle part of the lifting rod.
As a further aspect of the present invention: the positioning rod is an integral cylindrical rod, a positioning section is arranged at the lower end of the positioning rod, and the diameter of the positioning rod is larger than that of the positioning section.
As a further aspect of the present invention: the turnover assembly comprises a turnover shaft penetrating through the pin shaft hole and a turnover plate arranged on the turnover shaft;
the turnover plate is positioned in the turnover hole at the lower part of the main rod and can rotate around the turnover shaft.
As a further aspect of the present invention: the middle position of the upper end face of the turnover plate is provided with a transverse positioning groove, the middle position of one side face of the turnover plate is provided with a longitudinal positioning groove, and the transverse positioning groove and the longitudinal positioning groove are matched with the positioning section at the lower end of the positioning rod.
As a further aspect of the present invention: the turnover plate is a flat plate with uniform density and uniform thickness;
the width of the turnover plate is smaller than the inner diameter of an upper beam lifting hole of the portal frame;
the distance from one side surface of the turnover plate provided with the longitudinal positioning grooves to the straight line of the pin shaft is a, the distance from one side surface of the turnover plate not provided with the longitudinal positioning grooves to the straight line of the pin shaft is b, and the distance a and the distance b have a relation of a < b.
As a further aspect of the present invention: the hanger rod tool is used in pairs when the door frame is detached.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the hanger rod tool comprises a main rod, a limiting assembly and a turning assembly, is simple in overall structure and convenient to use, reduces the manufacturing and processing cost, can play a good auxiliary role in the process of mounting and dismounting the portal frame, can also realize quick separation of the hanger rod tool from a lifting hole of an upper beam of the portal frame, and is favorable for popularization and use;
(2) the limiting assembly arranged inside the main rod of the suspender tool is matched with the overturning assembly arranged at the lower part of the main rod for use, so that the overturning plate of the suspender tool can be in a horizontal state under the action of the limiting assembly when the gantry is lifted, and the stability of the gantry in the dismounting process is ensured; meanwhile, the turnover plate of the turnover assembly can realize automatic turnover, so that the boom tool can be conveniently separated from the lifting hole of the upper beam of the portal frame, potential safety hazards caused by manual climbing or high-altitude operation are eliminated, time and labor are saved, the time for separating the boom tool from the lifting hole of the upper beam of the portal frame is greatly shortened, and the dismantling efficiency of the boom tool is improved;
(3) the limiting assembly is arranged into a T-shaped structure capable of moving up and down along the vertical direction, so that the limiting assembly can position the turnover plate in different states, and the turnover plate is simple in structure and convenient to use;
(4) the overturning assembly is arranged to be of a structure comprising an overturning plate and an overturning shaft, and the overturning plate is arranged to be a flat plate with uniform density and uniform thickness, so that the width of the overturning plate is smaller than the inner diameter of an upper beam lifting hole of the portal frame; and the mass of the section of the turnover plate provided with the longitudinal positioning groove is smaller than that of the section of the turnover plate not provided with the longitudinal positioning groove, so that the turnover plate can be automatically turned over.
Drawings
FIG. 1 is a diagram of a working state of the boom assembly of the present invention when the gantry is disassembled;
fig. 2 is a three-dimensional structure diagram of the boom tool of the present invention;
fig. 3 is a side view of the boom tool of the present invention;
fig. 4 is a cross-sectional view of the boom assembly of the present invention when the gantry is disassembled;
figure 5 is the cross-sectional view of the utility model discloses when jib frock breaks away from in lifting by crane the hole.
In the figure:
1-a main rod, 11-a lifting through hole, 12-a turning hole, 13-a lifting through hole, 14-a pin shaft hole and 101-a gantry upper beam;
2-a limiting component, 21-a positioning rod, 22-a lifting rod and 201-a positioning section;
3-turnover component, 31-turnover shaft, 32-turnover plate, 301-transverse positioning groove and 302-longitudinal positioning groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a boom tool for disassembling and assembling a gantry is used in pairs when disassembling the gantry. Every jib frock includes mobile jib 1, sets up in the inside spacing subassembly 2 of mobile jib and sets up the upset subassembly 3 in the mobile jib lower part. When the gantry crane is used specifically, when the boom is assembled and disassembled, the upper part of the main rod 1 is connected with a hoisting device, the lower part of the main rod penetrates through a hoisting hole of an upper beam 101 of the gantry, the overturning assembly 3 is positioned below the upper beam, and the lifting rod 22 of the limiting assembly 2 is positioned above the upper beam; a main rod 1 of a suspender tool penetrates through hoisting holes at two ends of an upper beam 101 of a gantry, and a turning assembly 3 arranged at the lower part of the main rod is turned, so that the turning assembly 3 is horizontally arranged and cannot be separated from the hoisting holes of a gantry beam; the overturning assembly 3 is required to be limited through the limiting assembly 2 arranged in the main rod 1 after overturning, and the overturning assembly 3 is prevented from being automatically overturned to be separated from a lifting hole of the gantry upper cross beam 101.
After the boom tool is installed on the upper cross beam 101 of the portal, the upper part of the main rod 1 of the boom tool is connected with the hoisting equipment, the hoisting equipment is controlled to work, and then the hoisting and descending of the whole portal are realized, so that the requirement of the portal in the dismounting process is met, the use is convenient, the operation is simple, and the dismounting efficiency of the portal is improved.
Referring to fig. 2-3, the boom assembly includes a main boom 1, a limiting assembly 2 disposed inside the main boom, and an overturning assembly 3 disposed at a lower portion of the main boom, wherein a lifting through hole 11 is longitudinally formed at an upper portion of the main boom 1, and an overturning hole 12 is longitudinally formed at a bottom end of the main boom; the lifting through hole 11 and the turning hole 12 are located on the same vertical line, the lifting through hole 11 is a waist-shaped hole, and the turning hole 12 is a waist-shaped hole with an open lower end.
When the lifting and pulling assembly is used, the lifting and pulling rod 22 of the limiting assembly 2 is transversely placed in the lifting through hole 11, and the whole limiting assembly 2 can vertically move up and down by lifting or lowering the horizontal height of the lifting and pulling rod 22; the roll-over plate 32 of the roll-over assembly 3 is located the roll-over hole 12, and the direction that the roll-over plate 32 was placed is perpendicular with the degree of depth direction of roll-over hole 12, and then makes the roll-over plate 32 rotate around trip shaft 31 in the roll-over hole 12 to realize the demand of jib frock under different user state.
A hoisting through hole 13 is transversely formed at the position, close to the upper end, of the main rod 1, and a pin shaft hole 14 is transversely formed at the position, close to the lower end, of the main rod; the hoisting through hole 13 is positioned above the lifting through hole 11, the pin shaft hole 14 is positioned in the middle of the turnover hole 12, and the depth direction of the pin shaft hole 14 is vertical to the depth direction of the turnover hole 12.
Referring to fig. 4-5, the position limiting assembly 2 can move up and down in the main rod 1 along the vertical direction; the turnover plate 32 of the turnover assembly 3 is limited by the positioning rod 21 of the limiting assembly 2.
A cylindrical through hole is formed in the inner part of the main rod 1 between the lifting through hole 11 and the turning hole 12 along the longitudinal direction; the cylindrical through hole is located in the middle of the inner part of the main rod 1.
The limiting assembly 2 comprises a positioning rod 21 and a lifting rod 22 which are in a T-shaped structure; namely, the whole limiting assembly 2 is in a T-shaped structure, the positioning rod 21 longitudinally penetrates through a cylindrical through hole in the main rod 1, and the lifting rod 22 is transversely placed in the lifting through hole 11 at the upper part of the main rod 1;
the upper part of the positioning rod 21 is connected with the middle part of the lifting rod 22.
The positioning rod 21 is an integral cylindrical rod, a positioning section 201 is arranged at the lower end of the positioning rod 21, and the diameter of the positioning rod 21 is larger than that of the positioning section 201.
The overturning component 3 comprises an overturning shaft 31 penetrating through the pin shaft hole and an overturning plate 32 arranged on the overturning shaft; the turning plate 32 is positioned in the turning hole 12 at the lower part of the main rod and can rotate around the turning shaft 31.
The middle position of the upper end face of the turnover plate 32 is provided with a transverse positioning groove 301, the middle position of one side face of the turnover plate is provided with a longitudinal positioning groove 302, and the transverse positioning groove 301 and the longitudinal positioning groove 302 are matched with the positioning section 201 at the lower end of the positioning rod.
The turnover plate 32 is a flat plate with uniform density and uniform thickness; the width of the turnover plate 32 is smaller than the inner diameter of a lifting hole of the upper beam 101 of the gantry;
the distance from one side surface of the turning plate 32 provided with the longitudinal positioning groove 302 to the straight line of the pin shaft is a, the distance from one side surface not provided with the longitudinal positioning groove 302 to the straight line of the pin shaft is b, and the relationship of a < b exists between the distance a and the distance b.
Principle and process that the jib frock breaks away from in portal entablature 101 hoisting hole:
when the suspender tool is in a hoisting state, the turnover plate 32 of the turnover assembly 3 is in a horizontal state, and the upper end surface of the turnover plate 32, which is provided with the transverse positioning groove 301, is upward in a horizontal state; at this time, the lifting rod 22 of the limiting assembly 2 is located at the lower position of the lifting through hole 11, the lower end of the positioning rod 21 of the limiting assembly 2 is in contact with the upper end of the turnover plate 32, specifically, the positioning section 201 arranged at the lower end of the positioning rod is matched with the transverse positioning groove 301 arranged on the upper end face of the turnover plate 32, the turnover plate 32 is limited to rotate in the vertical plane in the depth direction of the turnover hole 12, and the upper end face of the turnover plate 32 extending out of the turnover hole 12 is in contact with the lower bottom face of the gantry upper beam 101. When the lifting equipment connected with the upper part of the main rod 1 works, the lifting of the whole gantry can be realized through the suspender tool.
The process that the jib frock breaks away from in the portal entablature 101 lifting eye does:
(1) promote spacing subassembly 2: lifting the lifting rod 22 upwards from the lower part of the lifting through hole 11 along the vertical direction until the positioning section 201 at the lower part of the limiting rod of the limiting component 2 is separated from the transverse positioning groove 301 of the turnover plate 32;
(2) the overturning component 3 automatically overturns: after the positioning section 201 at the lower part of the limiting rod is separated from the transverse positioning groove 301, the turning plate 32 is a flat plate with uniform density and uniform thickness, and the distance a from the side surface of the turning plate 32 provided with the longitudinal positioning groove 302 to the straight line of the pin shaft is smaller than the distance b from the side surface of the turning plate 32 not provided with the longitudinal positioning groove 302 to the straight line of the pin shaft, so that the weight of the turning plate 32 on two sides of the vertical line of the turning shaft 31 is unequal, that is, the mass of the turning plate 32 provided with the longitudinal positioning groove 302 is smaller than that of the turning plate 32 not provided with the longitudinal positioning groove 302.
When the positioning section 201 at the lower part of the limiting rod is separated from the transverse positioning groove 301, the turnover plate 32 rotates around the turnover shaft 31 under the action of self gravity, so that the section with smaller mass is turned over to the upper part, the section with larger mass is turned over to the lower part, namely the section with the longitudinal positioning groove 302 is turned over to the upper part, and the section without the longitudinal positioning groove 302 is turned over to the lower part, so that the side surface of the turnover plate 32 with the longitudinal positioning groove 302 is in a horizontal state;
(3) the limiting component 2 limits the overturning plate 32: when the turnover plate 32 of the turnover assembly 3 is automatically turned over, one side provided with the longitudinal positioning groove 302 is in a horizontal state, and at the moment, the longitudinal positioning groove 302 arranged on the turnover plate 32 is just positioned under the limiting rod;
the height of the limiting component 2 is reduced, namely the lifting rod 22 is lowered downwards along the vertical direction from the upper position of the lifting through hole 11 until the positioning section 201 at the lower part of the limiting rod of the limiting component 2 falls into the longitudinal positioning groove 302 of the turnover plate 32, the turnover plate 32 is in a vertical state, and the position of the turnover plate 32 in the vertical state can be limited by positioning the turnover plate 32 through the positioning section 201 at the lower part of the limiting rod of the limiting component 2;
moreover, the turnover plate 32 is automatically turned over under the action of the gravity of the turnover plate, so that when the turnover plate 32 is in a vertical state, the limiting assembly 2 does not need to limit the position of the turnover plate 32 in the vertical state;
(4) the suspender tool is pulled out from the hoisting hole: because the width of the turnover plate 32 is smaller than the inner diameter of the lifting hole of the upper beam 101 of the portal, when the turnover plate 32 is in a vertical state, the lifting rod tool can be separated from the lifting hole of the upper beam 101 of the portal by lifting the height of the whole lifting rod tool or reducing the height of the whole portal.
Through setting whole jib frock to mobile jib 1, upset subassembly 3 and spacing subassembly 2's structure for upset board 32 of subassembly 3 can rotate around trip shaft 31 in vertical plane, and the spacing subassembly 2 height-adjustable that is used for injecing the upset board 32 level or vertical state simultaneously makes the jib frock can play the additional function that lifts by crane whole portal when the dismouting portal, can also realize that the automation of jib frock breaks away from.
Compared with the prior art, the jib frock of this application can realize through simple operation that it breaks away from in the hoisting hole of portal entablature 101, the material resources of using manpower sparingly, the potential safety hazard that exists when having eliminated the workman and needing climbing or high altitude construction, and simultaneously, only need artifical simple tool such as lifting hook or bracing piece to control spacing subassembly 2's height below the portal, can realize the automatic upset of returning face plate 32 and lift by crane downthehole the breaking away from portal entablature 101, the time of dismantling in the jib frock lifts by crane downthehole from portal entablature 101 has been shortened greatly, the dismantlement efficiency of jib frock has been improved.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a jib frock for dismouting portal which characterized in that: comprises a main rod (1), a limiting component (2) arranged inside the main rod and a turning component (3) arranged at the lower part of the main rod;
when the hanger rod is assembled and disassembled on the portal frame, the upper part of the main rod (1) is connected with a hoisting device, the lower part of the main rod penetrates through a hoisting hole of an upper cross beam (101) of the portal frame, the overturning assembly (3) is positioned below the upper cross beam, and the lifting rod (22) of the limiting assembly (2) is positioned above the upper cross beam;
the limiting assembly (2) can move up and down in the main rod (1) along the vertical direction;
the turnover plate (32) of the turnover assembly (3) is limited by the positioning rod (21) of the limiting assembly (2).
2. The boom tool for disassembling and assembling a gantry of claim 1, wherein: the upper part of the main rod (1) is longitudinally provided with a lifting through hole (11), and the bottom end of the main rod is longitudinally provided with an overturning hole (12);
the lifting through hole (11) and the turning hole (12) are located on the same vertical line, the lifting through hole (11) is a waist-shaped hole, and the turning hole (12) is a waist-shaped hole with the lower end open.
3. The boom tool for disassembling and assembling a gantry of claim 2, wherein: a cylindrical through hole is formed in the inner part of the main rod (1) between the lifting through hole (11) and the overturning hole (12) along the longitudinal direction;
the cylindrical through hole is located in the middle of the inner portion of the main rod (1).
4. The boom tool for dismounting and mounting a gantry of claim 1 or 2, wherein: a hoisting through hole (13) is transversely formed at the position, close to the upper end, of the main rod (1), and a pin shaft hole (14) is transversely formed at the position, close to the lower end, of the main rod;
the hoisting through hole (13) is located above the lifting through hole (11), the pin shaft hole (14) is located in the middle of the turnover hole (12), and the depth direction of the pin shaft hole (14) is perpendicular to the depth direction of the turnover hole (12).
5. The boom tool for disassembling and assembling a gantry of claim 1, wherein: the limiting assembly (2) comprises a positioning rod (21) and a lifting rod (22) which are in a T-shaped structure;
the positioning rod (21) longitudinally penetrates through a cylindrical through hole in the main rod (1), and the lifting rod (22) is transversely placed in a lifting through hole (11) in the upper part of the main rod (1);
the upper part of the positioning rod (21) is connected with the middle part of the lifting rod (22).
6. The boom tool for disassembling and assembling a mast according to claim 5, wherein: the positioning rod (21) is an integral cylindrical rod, a positioning section (201) is arranged at the lower end of the positioning rod (21), and the diameter of the positioning rod (21) is larger than that of the positioning section (201).
7. The boom tool for disassembling and assembling a gantry of claim 1, wherein: the overturning assembly (3) comprises an overturning shaft (31) penetrating through the pin shaft hole and an overturning plate (32) arranged on the overturning shaft;
the turning plate (32) is positioned in the turning hole (12) at the lower part of the main rod and can rotate around the turning shaft (31).
8. The boom tool for disassembling and assembling a mast according to claim 7, wherein: the middle position of the upper end face of the turnover plate (32) is provided with a transverse positioning groove (301), the middle position of one side face is provided with a longitudinal positioning groove (302), and the transverse positioning groove (301) and the longitudinal positioning groove (302) are matched with a positioning section (201) at the lower end of the positioning rod.
9. The boom tool for dismounting and mounting a gantry of claim 7 or 8, wherein: the turnover plate (32) is a flat plate with uniform density and uniform thickness;
the width of the turnover plate (32) is smaller than the inner diameter of a lifting hole of the upper beam (101) of the gantry;
the distance from one side surface of the turnover plate (32) provided with the longitudinal positioning groove (302) to the straight line of the pin shaft is a, the distance from one side surface not provided with the longitudinal positioning groove (302) to the straight line of the pin shaft is b, and the distance a and the distance b have a relation of a < b.
10. The boom tool for disassembling and assembling a gantry of claim 1, wherein: the hanger rod tool is used in pairs when the door frame is detached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920582643.XU CN209872109U (en) | 2019-04-25 | 2019-04-25 | A jib frock for dismouting portal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920582643.XU CN209872109U (en) | 2019-04-25 | 2019-04-25 | A jib frock for dismouting portal |
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| Publication Number | Publication Date |
|---|---|
| CN209872109U true CN209872109U (en) | 2019-12-31 |
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ID=68962243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920582643.XU Active CN209872109U (en) | 2019-04-25 | 2019-04-25 | A jib frock for dismouting portal |
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| CN (1) | CN209872109U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109987498A (en) * | 2019-04-25 | 2019-07-09 | 安徽合力股份有限公司 | It is a kind of for dismounting the sunpender tooling of door frame |
| CN111184952A (en) * | 2020-03-11 | 2020-05-22 | 上海良相智能化工程有限公司 | Electric door breaking machine |
-
2019
- 2019-04-25 CN CN201920582643.XU patent/CN209872109U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109987498A (en) * | 2019-04-25 | 2019-07-09 | 安徽合力股份有限公司 | It is a kind of for dismounting the sunpender tooling of door frame |
| CN111184952A (en) * | 2020-03-11 | 2020-05-22 | 上海良相智能化工程有限公司 | Electric door breaking machine |
| CN111184952B (en) * | 2020-03-11 | 2024-03-12 | 上海良相智能化工程有限公司 | Electric door breaker |
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