CN113182381A - Square sleeve machining method - Google Patents
Square sleeve machining method Download PDFInfo
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- CN113182381A CN113182381A CN202110476663.0A CN202110476663A CN113182381A CN 113182381 A CN113182381 A CN 113182381A CN 202110476663 A CN202110476663 A CN 202110476663A CN 113182381 A CN113182381 A CN 113182381A
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- iron sheet
- bedplate
- processing method
- edge
- narrow edge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/065—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes starting from a specific blank, e.g. tailored blank
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/002—Positioning devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a square sleeve processing method, and belongs to the technical field of auxiliary processing of iron sheets. The method comprises the following steps: firstly, folding edges: selecting an iron sheet with a specified width, and then folding edges of the iron sheet by a processing device at the same interval along the length direction of the iron sheet from the front end of the iron sheet, wherein the bending angle is 90 degrees, and repeating for four times; II, reserving edges: cutting after a narrow edge with the edge distance of 3cm is reserved from the fourth bending position to the rear end of the iron sheet along the length direction of the iron sheet; thirdly, fixing: and a hole is formed in the narrow edge, a hole is formed in the position corresponding to the head end of the iron sheet, and the fastener sequentially penetrates through the holes in the narrow edge and the head end of the iron sheet to fix the narrow edge and the head end of the iron sheet. The invention has simple operation, and the sleeve processing process does not need flame welding, but adopts a fastener connection mode, so that the connection structure is more effective.
Description
Technical Field
The invention belongs to the technical field of auxiliary processing of iron sheets, and particularly relates to a square sleeve processing method.
Background
The iron sheet sleeve is a structural member commonly used in building construction, wherein before the square sleeve is applied, the iron sheet needs to be bent according to the size requirement of a use environment.
At present, a flanging machine is usually adopted for processing square sleeves in the market, but the special flanging machine for the market is high in price, can only bend iron sheets below 1.6mm, and is easy to damage machines when the thickness of the iron sheets is higher than 1.6 mm; manual processing is used on site, after the thickness of the iron sheet reaches 1.6mm, the iron sheet is not easy to bend by manual beating and bending, the iron sheet is relatively sharp, construction workers are easy to hurt, the finished product has poor effect, the welding process is used for cutting the iron sheet, welding leakage is easy to occur, time and labor are wasted, and the cost is increased; the market purchases the customized sleeve, the arrival time is long, the size is fixed, the sleeve cannot be replaced in time after being changed on site, the construction period is influenced, and the cost is high; therefore, an auxiliary processing technology capable of effectively assisting in bending the iron sheet with the thickness of more than 1.6mm is needed.
Through retrieval, the Chinese patent publication number: CN 102430618A; the publication date is as follows: 2012, 5 month 2 day; the square folding device comprises two supports, the tops of the supports are provided with flange plates, the flange plates are connected with connecting bases, front and rear upright posts are arranged on the connecting bases, a fixed beam and a movable beam are arranged in a slide way between the front and rear upright posts, the movable beam can slide in the slide way, bearing covers at the top ends of the front and rear upright posts are provided with screw sleeves in threaded connection with screw rods, the upper ends of the screw rods are connected with rotating hand wheels, the lower ends of the screw rods are connected with screw rod seats, one end of the movable beam is welded below the screw rod seats, the inner side of each front upright post is connected with a rotating shaft sleeve at the fixed beam, the rotating shaft sleeves are connected with turnover rods through rotating shaft connecting pieces respectively, the bottom ends of the turnover rods are connected with operating hand rods, the upper surfaces of the turnover rods are provided with edge pressing members, the movable beams can move up and down in the slide way, and the turnover rods can rotate around the rotating shaft seats. Although the device of this application can reach the novel of supplementary bending iron sheet, the device of this application is buckled the operation complicacy, and the device is with high costs, is not convenient for use widely.
Disclosure of Invention
In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided a method for processing a square sleeve, comprising the steps of:
firstly, folding edges: selecting an iron sheet with a specified width, and then folding edges of the iron sheet by a processing device at the same interval along the length direction of the iron sheet from the front end of the iron sheet, wherein the bending angle is 90 degrees, and repeating for four times;
II, reserving edges: cutting after a narrow edge with the edge distance of 3cm is reserved from the fourth bending position to the rear end of the iron sheet along the length direction of the iron sheet;
thirdly, fixing: and a hole is formed in the narrow edge, a hole is formed in the position corresponding to the head end of the iron sheet, and the fastener sequentially penetrates through the holes in the narrow edge and the head end of the iron sheet to fix the narrow edge and the head end of the iron sheet.
According to the square sleeve processing method of the embodiment of the present invention, optionally, the processing device of the first step includes:
the workbench consists of a horizontally arranged bedplate and supporting legs fixedly connected to the bottom of the bedplate;
the pressing plate mechanism is arranged on the top surface of the front end of the bedplate, and an insertion seam for the iron sheet to be processed to pass through is reserved between the pressing plate mechanism and the top surface of the bedplate;
and the bent plate part is a flat plate and is arranged on the front end surface of the bedplate, and one end of the bent plate part is hinged with the front end surface of the bedplate.
According to the square sleeve processing method provided by the embodiment of the invention, optionally, one end of the bent plate part is hinged with the front end face of the bedplate through a hinge shaft, and two sides of the other end of the bent plate part are fixedly connected with the operating handle.
According to the square sleeve processing method provided by the embodiment of the invention, optionally, the height of the insertion slot is 3 mm.
According to the square sleeve processing method of the embodiment of the invention, optionally, the pressing plate mechanism comprises:
the first steel bars are two angle steels, are parallel to each other and are symmetrically arranged at the top of the bedplate along the width direction of the bedplate;
and the second steel bar is an angle steel and is arranged between the first two steel bars along the length direction of the bedplate, and the two ends of the transverse edge of the second steel bar are fixedly connected with the front ends of the transverse edges of the first steel bars respectively.
According to the square sleeve processing method provided by the embodiment of the invention, optionally, the thickness of one transverse edge of the steel bar of the pressing plate mechanism is 3 mm.
According to the square sleeve processing method provided by the embodiment of the invention, optionally, the corner of the second steel bar of the pressing plate mechanism faces the rear end of the bedplate, and the end of the transverse edge faces the front end of the bedplate.
According to the square sleeve processing method provided by the embodiment of the invention, optionally, the end parts of the two transverse sides of the steel bar are contact parts, and the end surfaces of the contact parts are cambered surfaces.
Advantageous effects
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the square sleeve processing method is simple to operate, and the sleeve processing process does not need flame welding, but adopts a fastener connection mode, so that the connection structure is more effective;
(2) according to the square sleeve processing method, the adopted processing device only needs to penetrate the iron sheet to be processed through the insertion seam, then the bending plate part is rotated upwards, the edge folding processing can be carried out, the processing of the square sleeve can be completed through repeated edge folding processing, the processing efficiency is far higher than that of manual processing, the processing quality is guaranteed, the processing method is safe and reliable, the square sleeve processing method can adapt to the processing of iron sheets with the thickness of 1.6mm, below 1.6mm and above, and the device cost is originally lower than that of a commercially available edge folding machine;
(3) according to the square sleeve processing method, the processing device is provided with the operating handle at the end part of the bent plate, an operator can hold the operating handle to drive the bent plate part to rotate, and the operation is more convenient;
(4) according to the square sleeve processing method, the height of the insertion seam of the adopted processing device is reasonable, the assembly requirement of the iron sheet with the thickness exceeding 1.6mm can be met, the situation of iron sheet position deviation caused by overlarge upward movement stroke of the iron sheet at the insertion seam can be prevented, and the flanging processing quality is ensured;
(5) according to the square sleeve processing method, the angle steel is adopted to manufacture the pressing plate mechanism, the structural cost is low, and the pressing plate mechanism meeting the plate bending requirement can be manufactured with little processing amount by utilizing the shape characteristics of the angle steel.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIG. 1 is a front view of a machining apparatus used in the square casing machining method of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a plan view of the processing apparatus according to example 3;
FIG. 4 shows a side view of the processing apparatus of example 3;
FIG. 5 is a front view of the platen mechanism of embodiment 5;
FIG. 6 is a plan view showing a platen mechanism of embodiment 5;
FIG. 7 is a side view of a platen mechanism of embodiment 7;
reference numerals:
1. a work table; 10. a platen; 11. supporting legs;
2. a platen mechanism; 20. inserting into the seam; 21. a first steel bar; 22. a second steel bar; 220. a contact portion;
3. a bent plate portion; 30. hinging a shaft; 31. an operating handle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.
Example 1
The square sleeve processing method of the embodiment comprises the following steps:
firstly, folding edges: selecting an iron sheet with a specified width, and then folding edges of the iron sheet by a processing device at the same interval along the length direction of the iron sheet from the front end of the iron sheet, wherein the bending angle is 90 degrees, and repeating for four times;
II, reserving edges: cutting after a narrow edge with the edge distance of 3cm is reserved from the fourth bending position to the rear end of the iron sheet along the length direction of the iron sheet;
thirdly, fixing: and a hole is formed in the narrow edge, a hole is formed in the position corresponding to the head end of the iron sheet, and the fastener sequentially penetrates through the holes in the narrow edge and the head end of the iron sheet to fix the narrow edge and the head end of the iron sheet.
Current direction sleeve pipe adopts welding process when connecting the iron sheet, leak easily and weld, waste time and energy, and the pleasing to the eye degree of finished product effect is poor, there is the quality problem still in the junction, to this, this embodiment has designed a square sleeve pipe processing method, after quartic hem, reserve 3cm wide narrow limit back cutting iron sheet, utilize narrow limit and iron sheet front end department to fix, can adopt riveting or bolted connection's mode, whole course of working need not the flame welding, there is not the problem of weld leakage, and the pleasing to the eye degree of cost effect promotes greatly, connection quality has still been guaranteed.
Example 2
The method for processing the square sleeve of the embodiment is further improved on the basis of the embodiment 1, and the processing device of the first step comprises:
a workbench 1 which is composed of a horizontal bedplate 10 and supporting legs 11 fixedly connected with the bottom of the bedplate 10;
the pressing plate mechanism 2 is arranged on the top surface of the front end of the bedplate 10, and an insertion seam 20 for the iron sheet to be processed to pass through is reserved between the pressing plate mechanism 2 and the top surface of the bedplate 10;
and a bent plate portion 3 which is a flat plate and is provided on the front end surface of the bedplate 10, wherein one end of the bent plate portion 3 is hinged to the front end surface of the bedplate 10.
Although the flanging machine special for the existing market has high flanging efficiency, the cost is high, the machine is easy to damage when the flanging is carried out on an iron sheet with the thickness of more than 1.6mm, the manual machining efficiency is low, the quality of a finished product cannot be ensured, and potential safety hazards exist.
As shown in fig. 1 and 4, the workbench 1 of the present embodiment is composed of a bedplate 10 and supporting legs 11, wherein the bedplate 10 is a steel plate, is rectangular and horizontally arranged, the supporting legs 11 are triangular, the top part is welded and fixed on the bottom surface of the bedplate 10, the bottom part of the supporting legs 11 is fixed with the ground, and further the bedplate 10 is stably supported; one end of the bedplate 10 along the width direction is a front end, the other end is a rear end, the pressing plate mechanism 2 is fixed on the top surface of the front end, the pressing plate mechanism 2 is mainly used for pressing and fixing the iron sheet when bending the iron sheet to prevent the iron sheet from sliding and jumping randomly, two sides of the bottom end of the pressing plate mechanism 2 are fixedly welded with the top surface of the bedplate 10, a gap is left between the middle part of the bottom end and the top surface of the bedplate 10 to form an insertion seam 20, and as shown in fig. 1 and 2, when the bedplate is used, the iron sheet to be processed penetrates through the insertion seam 20; the tip of bent plate portion 3 is articulated with platen 10 preceding terminal surface, and bent plate portion 3 can rotate around the hinged end, waits to process the iron sheet and passes insertion seam 20 and stretch out from platen 10 front end, and through upwards rotating bent plate portion 3, the top surface of bent plate portion 3 drives the iron sheet upward movement with the iron sheet contact back, and then reaches the effect of bending, through to iron sheet hem four times, then with iron sheet end to end fixed, can accomplish the processing to the side sleeve pipe.
Utilize the processingequipment of this embodiment, only need to wait to process the iron sheet and pass after inserting seam 20, through to upwards rotating bent plate portion 3, can carry out the hem processing, can accomplish square sheathed tube processing through hem processing many times, machining efficiency is far more than artifical manual processing, and processingquality is guaranteed, and safe and reliable can adapt to the processing of iron sheet more than 1.6mm, and the device cost is far less than the commercially available flanging machine.
Example 3
The method for processing the square sleeve according to the embodiment is further improved on the basis of the embodiment 2, wherein one end of the bent plate part 3 is hinged to the front end face of the bedplate 10 through a hinge shaft 30, and operation handles 31 are fixedly connected to two sides of the other end of the bent plate part 3.
As shown in fig. 2 and 3, the hinge shaft 30 includes a sleeve portion at both ends and a rotation shaft portion at a middle portion, the sleeve portion is fixedly welded to the front end surface of the bedplate 10, both ends of the rotation shaft portion are rotatably connected to the sleeve portions, and one end portion of the bent plate portion 3 is fixedly welded to the rotation shaft portion, thereby forming the hinge joint of the bent plate portion 3 and the hinge shaft 30.
As shown in fig. 3 and 4, two operation handles 31 are fixedly welded on two sides of the other end of the bent plate portion 3, and an operator can hold the operation handles 31 to drive the bent plate portion 3 to rotate, so that the operation is more convenient.
Further, a gap is reserved between the rotating shaft portion and the front end face of the bedplate 10, the vertex of the rotating shaft portion is flush with the top face of the bedplate 10, the bent plate portion 3 is welded and fixed on the rotating shaft portion, when the bent plate portion 3 is horizontally arranged, the top face of the bent plate portion 3 is flush with the top face of the bedplate 10, and from the horizontal position of the bent plate portion 3, when the bent plate portion 3 upwards rotates for at least 90 degrees, the bent plate portion 3 cannot be in interference contact with the bedplate 10 or the pressing plate mechanism 2.
Example 4
The processing method of the square sleeve of the embodiment is further improved on the basis of the embodiment 3, and the height of the insertion slot 20 is 3 mm.
The height of the insertion slot 20 is 3mm in the embodiment, on one hand, the assembly of the iron sheet with the thickness exceeding 1.6mm can be met, on the other hand, when the bent plate part 3 rotates upwards to drive the iron sheet to be bent, the height of the insertion slot 20 is controlled to be 3mm, the situation that the position of the iron sheet is deviated due to the fact that the upward movement stroke of the iron sheet at the insertion slot 20 is too large can be prevented, and the flanging processing quality is ensured.
Example 5
The method for processing the square sleeve of the embodiment is further improved on the basis of the embodiment 4, and the pressing plate mechanism 2 includes:
the first steel bars 21 are two angle steels, are parallel to each other, and are symmetrically arranged at the top of the bedplate 10 along the width direction of the bedplate 10;
and a second steel bar 22 which is an angle steel and is arranged between the two first steel bars 21 along the length direction of the bedplate 10, and the two end parts of the transverse edge of the second steel bar 22 are fixedly connected with the front ends of the transverse edges of the first steel bars 21 respectively.
As shown in fig. 5 and 6, the platen mechanism 2 is made of angle steel, which is a finished product profile commonly used in the field of building construction, and the present embodiment utilizes waste angle steel scraps and is designed as the platen mechanism 2.
Two 21 length directions of billet arrange along the width direction of platen 10, and two 21 symmetrical formulas of billet arrange, fixed welding is at platen 10 front end top, leave the distance of settling billet two 22 between two billet one 21, arrange billet two 22 length directions along platen 10 length direction, the both ends on the horizontal limit of billet two 22 respectively with the horizontal limit front end welding of each billet one 21, the gap of the horizontal limit bottom surface of billet two 22 and platen 10 top surface has constituted insertion gap 20 promptly, insertion gap 20's height is just billet one 21 horizontal limit thickness promptly.
Further, the thickness of the transverse edge of the first 21 steel bar is 3mm, so that the assembly requirement that the thickness exceeds 1.6mm of an iron sheet can be met, the situation that the position of the iron sheet deviates due to the fact that the upward movement stroke of the iron sheet at the insertion seam 20 is too large can be prevented, and the flanging processing quality is ensured.
Example 6
The method for processing a square sleeve according to this embodiment is further improved from embodiment 5 in that the corner of the second steel bar 22 of the platen mechanism 2 faces the rear end of the platen 10, and the end of the transverse edge faces the front end of the platen 10.
The tip of the horizontal limit of two 22 billet is towards platen 10 front end, and when the iron sheet was bent, the iron sheet contacted with the bottom surface on the horizontal limit of two 22 billets, and mainly took place to bend under the effect of horizontal limit front end, if the bight of two 22 billet is towards platen 10 front end, when the iron sheet was bent, the iron sheet part that bent plate portion 3 drove can contact with the perpendicular limit of two 22 billets, the condition that the angle of buckling is less than 90 probably appears.
Example 7
The method for processing the square sleeve of the embodiment is further improved on the basis of the embodiment 6, wherein the end of the transverse edge of the second steel bar 22 is a contact part 220, and the end face of the contact part 220 is an arc surface.
As shown in fig. 7, the end face of the contact portion 220 is set to be an arc surface, so that when the iron sheet is in contact with the contact portion 220 in the bending process, the contact portion of the iron sheet can be prevented from generating sharp indentations, and the influence on the processing quality of the finally formed square sleeve can be avoided.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A square sleeve processing method is characterized by comprising the following steps:
firstly, folding edges: selecting an iron sheet with a specified width, and then folding edges of the iron sheet by a processing device at the same interval along the length direction of the iron sheet from the front end of the iron sheet, wherein the bending angle is 90 degrees, and repeating for four times;
II, reserving edges: cutting after a narrow edge with the edge distance of 3cm is reserved from the fourth bending position to the rear end of the iron sheet along the length direction of the iron sheet;
thirdly, fixing: and a hole is formed in the narrow edge, a hole is formed in the position corresponding to the head end of the iron sheet, and the fastener sequentially penetrates through the holes in the narrow edge and the head end of the iron sheet to fix the narrow edge and the head end of the iron sheet.
2. The method for machining the square sleeve according to claim 1, wherein the machining device in the first step comprises:
the workbench consists of a horizontally arranged bedplate and supporting legs fixedly connected to the bottom of the bedplate;
the pressing plate mechanism is arranged on the top surface of the front end of the bedplate, and an insertion seam for the iron sheet to be processed to pass through is reserved between the pressing plate mechanism and the top surface of the bedplate;
and the bent plate part is a flat plate and is arranged on the front end surface of the bedplate, and one end of the bent plate part is hinged with the front end surface of the bedplate.
3. The square bushing processing method according to claim 2, wherein: one end of the bent plate part is hinged with the front end face of the bedplate through a hinge shaft, and two sides of the other end of the bent plate part are fixedly connected with operating handles.
4. The square bushing processing method according to claim 2, wherein: the insertion slit height was 3 mm.
5. The square bushing processing method according to claim 2, wherein the pressing plate mechanism comprises:
the first steel bars are two angle steels, are parallel to each other and are symmetrically arranged at the top of the bedplate along the width direction of the bedplate;
and the second steel bar is an angle steel and is arranged between the first two steel bars along the length direction of the bedplate, and the two ends of the transverse edge of the second steel bar are fixedly connected with the front ends of the transverse edges of the first steel bars respectively.
6. The square bushing processing method according to claim 5, wherein: the thickness of a transverse edge of a steel bar of the pressing plate mechanism is 3 mm.
7. The square bushing processing method according to claim 6, wherein: the corner of a steel bar II of the pressing plate mechanism faces the rear end of the bedplate, and the end part of the transverse edge faces the front end of the bedplate.
8. The square bushing processing method according to claim 7, wherein: the end parts of the two transverse edges of the steel bar are contact parts, and the end faces of the contact parts are cambered surfaces.
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| CN205613878U (en) * | 2016-03-18 | 2016-10-05 | 胡佩军 | Manual trigger |
| CN206392639U (en) * | 2016-11-04 | 2017-08-11 | 中建安装工程有限公司 | Airduct wall bushing prefabricated platform |
| CN109130333A (en) * | 2017-06-16 | 2019-01-04 | 深圳市云罐科技有限公司 | A kind of paper can production method |
| CN206838812U (en) * | 2017-06-19 | 2018-01-05 | 中国化学工程第三建设有限公司 | A kind of steel plate bending instrument |
| CN209174620U (en) * | 2018-09-12 | 2019-07-30 | 上海绿地建设(集团)有限公司 | Rapid shaping Simple bending tool |
| CN209491199U (en) * | 2018-12-29 | 2019-10-15 | 佛山市顺德区惠尔家电器制品有限公司 | Automatically the metal plate bending machine of rectangular moulding is bent |
| CN111842545A (en) * | 2019-04-26 | 2020-10-30 | 周兆弟 | Square pile hoop manufacturing equipment |
| CN210098596U (en) * | 2019-05-08 | 2020-02-21 | 中国电建集团河南工程有限公司 | Manual sheet metal angle folding device |
| CN210208191U (en) * | 2019-06-28 | 2020-03-31 | 青岛昌龙金属制品有限公司 | Sheet steel bending and shaping device |
| CN211161337U (en) * | 2019-12-16 | 2020-08-04 | 张大勋 | Bending device is used in garbage bin production |
| CN211489132U (en) * | 2019-12-17 | 2020-09-15 | 尹大春 | Manual type aluminum buckle plate bending machine |
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