CN218361323U - Roll changing device for perforating machine - Google Patents
Roll changing device for perforating machine Download PDFInfo
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- CN218361323U CN218361323U CN202222717418.7U CN202222717418U CN218361323U CN 218361323 U CN218361323 U CN 218361323U CN 202222717418 U CN202222717418 U CN 202222717418U CN 218361323 U CN218361323 U CN 218361323U
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- main transmission
- transmission shaft
- carrier roller
- lifting
- shifting fork
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Abstract
The utility model relates to a roll changing device for a perforating machine, which belongs to the technical field of metal rolling and comprises a supporting device and a disengaging gear which are arranged under a main transmission shaft and are arranged in the front and back direction; the supporting device comprises a lifting carrier roller, the lifting carrier roller is provided with a limiting structure to limit the axial position of the main transmission shaft, the lifting carrier roller is connected with a lifting driving device, and the lifting driving device drives the lifting carrier roller to ascend to support the main transmission shaft; disengaging device includes the shift fork just to the flexible spline position setting of final drive shaft, the fork mouth both sides inboard of shift fork is equipped with the gyro wheel relatively, the stalk portion of shift fork articulates on the disengaging device base, be equipped with shift fork actuating mechanism on the disengaging device base, shift fork actuating mechanism drive shift fork is around its articulated center certain angle of swing to it is flexible with setting up at final drive shaft flexible spline department and being the preceding disc of pushing away of arranging around and pushing away the disc effect after and stirring final drive shaft, the unbalance loading and the card of current side sliding frame structure have been avoided and have been hindered, roll changing efficiency has been improved.
Description
Technical Field
The utility model belongs to the technical field of the metal rolling, a roll changing device for puncher is related to.
Background
The common hot-rolled seamless steel tube production process method uses a puncher to punch a solid tube blank, and the puncher mainly comprises a front-stage blank pushing machine, a puncher body, a rear-stage first section, a rear-stage second section and a roller transmission device.
The puncher body comprises two conical rollers which are arranged up and down, the axes of the rollers form a certain included angle, two semi-circular arc-shaped guide plates are arranged on the left and right, and a closed circular hole pattern is formed by matching the rollers.
The outlet of the puncher is sequentially provided with a background section, a background section and a roller transmission device, wherein the background section mainly comprises 5-6 centering embrace rollers and a group of conveying roller ways, the tail end of each conveying roller way is provided with a pipe-releasing clamp and a top cooling device or a top circulating replacement device, and the background section mainly comprises a gantry thrust seat, a top rod trolley, a track and the like.
The mandril of the puncher is a special tool for manufacturing a hollow steel pipe with the length of about 15-20 meters, the head of the mandril is provided with a conical mandril, and the tail of the mandril is connected with a two-section mandril trolley at the background. The push rod trolley is driven by a steel wire rope or a rack and can move forwards and backwards quickly. When the push rod moves forwards, the push rod can be driven to move forwards, after the push head is extended to a set position in the perforating machine, the gantry thrust block locks the push rod trolley to bear the axial thrust of perforation, and meanwhile, the centering holding roller at one section of the background holds the push rod to ensure that the center line of the push head is consistent with the center line of perforation rolling.
The roller transmission device comprises a motor, a speed reducer, a main transmission shaft and a supporting and releasing device of the main transmission shaft. The main transmission shaft is a telescopic universal shaft, the rear part of the universal shaft is a whole, the middle part and the front part of the universal shaft are a whole, and the two parts can realize relative telescopic through a spline pair.
The perforation process comprises the following steps: the heating furnace heats the solid pipe blank to about 1250 ℃, the solid pipe blank is conveyed to a front stage of the perforating machine, a blank pushing machine at the front stage pushes the high-temperature pipe blank into the perforating machine, upper and lower rollers rotating at high speed bite the pipe blank for skew rolling, and the pipe blank is rolled into a hollow pipe (about 5-10 meters in length) in a tool cavity formed by the upper and lower rollers, the left and right guide plates and the conical top. After the perforation is completed, the hollow pipe is conveyed out of the perforating machine by the background section, the hollow pipe is blocked by the pipe-releasing clamp at the tail end of the conveying roller way, meanwhile, the ejector rod trolley of the background section retreats to draw the ejector rod out of the hollow pipe, and the hollow pipe is transversely pulled out of the background section by the pulling machine. The ejector rod drives the ejector head to return to the ejector head cooling device after the pipe clamp is removed to cool the ejector head or the ejector head is replaced through the ejector head circulating replacement device. After the ejector head is cooled or replaced, the ejector rod moves forward again, and a new round of perforation technological process is started.
The roller is a main tool die for perforation deformation, endures high temperature and high pressure during work, has serious surface abrasion, and needs to be replaced after 1-2 weeks of work. When the roller is replaced, a supporting device is needed to support the main transmission shaft of the roller, a connecting bolt between the front end of the main transmission shaft and the tail part of the roller is manually removed, then the main transmission shaft is backwards separated by 400-500 mm, the old roller is taken out by a crane, a new roller is installed, and the main transmission shaft is pushed forwards and connected with the tail part of the roller.
The main transmission shaft supporting device of the existing punching machine is a U-shaped bracket which is arranged in the middle of the shaft and can be lifted and pushed and pulled back and forth. The base of the shaft supporting device is arranged on the side face of a main transmission shaft in order to let the puncher back-stage equipment at one section, a plurality of guide rods and a sliding frame are installed on the base, a U-shaped bracket and a lifting cylinder are installed on the sliding frame, and the sliding frame is driven by a push-pull hydraulic cylinder to slide back and forth. When the roller is changed, the U-shaped bracket is driven by the lifting hydraulic cylinder to lift up, then supports the main shaft and just clamps the disc in the middle of the main shaft, and then the sliding frame is driven by the push-pull hydraulic cylinder to move forwards and backwards, so that the main shaft is driven to stretch. The whole device is arranged eccentrically, only the U-shaped bracket is suspended below a disc extending to the middle part of the main shaft, and the push-pull hydraulic cylinder drives the sliding frame to move forwards and backwards, so that the sliding frame is frequently blocked on the guide rod due to stress unbalance loading, manual repeated intervention has to be carried out, the roller changing time is prolonged, and the roller changing efficiency is reduced.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a roll changing device for piercing mill to improve roll changing efficiency.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a roll changing device for a perforating machine comprises a supporting device and a disengaging device which are arranged under a main transmission shaft and are arranged in front and back; the supporting device comprises a lifting carrier roller, the lifting carrier roller is provided with a limiting structure to limit the axial position of the main transmission shaft, the lifting carrier roller is connected with a lifting driving device, and the lifting driving device drives the lifting carrier roller to ascend to support the main transmission shaft; the disengaging device comprises a shifting fork which is just opposite to the telescopic spline position of the main transmission shaft, the inner sides of two sides of a fork opening of the shifting fork are relatively provided with idler wheels, a handle part of the shifting fork is hinged on a disengaging device base, a shifting fork driving mechanism is arranged on the disengaging device base, the shifting fork driving mechanism drives the shifting fork to swing for a certain angle around a hinge center of the shifting fork, and the shifting fork drives the main transmission shaft to stretch under the action of a front push disc and a rear push disc which are arranged at the telescopic spline position of the main transmission shaft in a front-back mode through the two idler wheels.
Optionally, the action points of the two rollers and the forward pushing disc and the backward pushing disc are centrosymmetric about the central line of the main transmission shaft.
Optionally, the fork opening of the shifting fork is U-shaped or V-shaped.
Optionally, the lifting driving device is a swinging device, the swinging device includes a swinging rod fixedly connected with the lifting carrier roller and vertically arranged with the lifting carrier roller, the other end of the swinging rod is hinged on a supporting device base through a rotating shaft arranged in parallel with the lifting carrier roller, the rotating shaft is connected with a rotating shaft driving device for driving the rotating shaft driving device to rotate, and the supporting device base is fixed on a ground foundation.
Optionally, the rotating shaft driving device is driven by a hydraulic or electric motor.
Optionally, the lifting driving device is a vertical lifting device, and the vertical lifting device is a jacking hydraulic cylinder or a screw nut transmission mechanism driven by a motor.
Optionally, the shifting fork driving mechanism comprises a linear hydraulic cylinder arranged on the base of the disengaging device, the output end of the linear hydraulic cylinder is hinged with a bayonet lock, the bayonet lock is in sliding connection with a limiting hole which is located on the shifting fork handle part and is long in strip shape and is arranged along the length direction of the shifting fork handle part, and two ends of the bayonet lock are provided with limiting structures to prevent slipping from the limiting hole.
Optionally, the forward pushing disc and the backward pushing disc are welded with the telescopic shaft section of the main transmission shaft into a whole.
Optionally, the limiting structure is in a shape of an inward concave arc or a V.
Optionally, the lifting carrier roller is a tapered shaft with two large ends and a small middle, so that a limiting structure is formed by the circumferential surface of the lifting carrier roller.
The beneficial effects of the utility model reside in that: the separated main transmission shaft supporting device and the separating device are adopted, the separating device is arranged at the middle rear part of the main transmission shaft and right below the telescopic spline pair, and a shifting fork of the separating device is driven to adopt a swing arm type structure, so that the unbalance loading and the blocking of the existing side sliding frame structure are avoided; when the roller wheel on the inner side of the fork opening of the shifting fork pulls the main transmission shaft to stretch, the center of acting force is consistent with the stretching direction of the shaft, the blocking of a spline pair can be effectively reduced, and the roller changing time of the puncher is reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a first schematic structural view of a roll changing device according to the present invention;
FIG. 2 is a schematic structural view II of the roll changing device of the present invention;
FIG. 3 is a schematic structural view of the supporting device;
fig. 4 is a schematic view of the release device.
Reference numerals are as follows: the device comprises an upper roller 1, a main transmission shaft 2, a speed reducer 3, a motor 4, a supporting device 5, a disengaging device 6, a lower roller 7, a rear pushing disc 8, a front pushing disc 9, a lifting carrier roller bearing block 10, a lifting carrier roller 11, a lifting carrier roller driving hydraulic cylinder 12, a supporting device base 13, a roller 14, a shifting fork 15, a shifting fork bearing block 16, a shifting fork driving hydraulic cylinder 17 and a disengaging device base 18.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, the figures are shown in schematic form and not in pictorial form; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1-4, a roll changing device for a perforating machine comprises a supporting device 5 and a disengaging device 6 which are arranged in the front and back direction and are arranged right below a main transmission shaft 2; the supporting device 5 comprises a lifting carrier roller 11 positioned right below the main transmission shaft 2, the lifting carrier roller 11 is provided with a limiting structure to limit the axial position of the main transmission shaft 2, the lifting carrier roller 11 is connected with a lifting driving device, and the lifting driving device drives the lifting carrier roller 11 to ascend to support the main transmission shaft 2; the disengaging device 6 comprises a shifting fork 15 which is just opposite to the telescopic spline of the main transmission shaft 2, the inner sides of two sides of a fork opening of the shifting fork 15 are relatively provided with idler wheels 14, the handle part of the shifting fork 15 is hinged on a disengaging device base 18, a shifting fork driving mechanism is arranged on the disengaging device base 18, the shifting fork driving mechanism drives the shifting fork 15 to swing by a certain angle around a hinge center of the shifting fork, and the main transmission shaft 2 is stirred to stretch under the action of two idler wheels 14 and a front push disc 9 and a rear push disc 8 which are arranged at the telescopic spline of the main transmission shaft 2 in a front-back mode. The fork opening of the shifting fork 15 can be U-shaped or V-shaped, so that the roller 14 is convenient to install.
The utility model discloses a strutting arrangement 5 and the disengaging gear 6 of separation, disengaging gear 6 arrange under flexible spline is vice, and disengaging gear 6's shift fork drive adopts swing arm formula structure, has avoided the unbalance loading and the card of current side sliding frame structure to hinder.
In order to make gyro wheel 14 when stirring final drive shaft 2 flexible, the center of effort is unanimous with the flexible direction of axle, alleviates the vice card that comes from the spline and hinders, the utility model discloses a two gyro wheels 14 all are central symmetry about final drive shaft 2 with the action point that pushes away disc 9 before and after with 8 discs.
The lifting driving device of the utility model can be a swinging device, the swinging device comprises a swinging rod which is fixedly connected with a lifting carrier roller 11 and is vertically arranged with the lifting carrier roller 11 so as to form a swinging arm type structure, the other end of the swinging rod is hinged on a supporting device base 13 through a rotating shaft which is arranged in parallel with the lifting carrier roller 11, the rotating shaft is connected with a rotating shaft driving device which drives the rotating shaft driving device, and the supporting device base 13 is fixed on a ground foundation; the rotating shaft driving device can be driven by hydraulic pressure or a motor.
The utility model discloses a lift drive also can be vertical lift device, and vertical lift device can be jacking pneumatic cylinder or by motor drive's screw-nut drive mechanism.
The utility model discloses a shift fork actuating mechanism is including setting up the linear hydraulic cylinder on disengaging device base 18, and linear hydraulic cylinder's output articulates there is the bayonet lock, the bayonet lock with be located shift fork stalk portion and along the spacing hole sliding connection that is rectangular shape that shift fork stalk portion length direction seted up, and the both ends of bayonet lock are equipped with limit structure in order to prevent from spacing downthehole slippage.
The utility model discloses a but preceding disc 9 and the back of pushing away disc 8 and final drive shaft 2's scalable shaft section welding is as an organic whole, also can adopt other fixed connection modes. The limiting structure can be in an inwards concave arc shape or a V shape. The limiting structure can be formed by the circumferential surface of the lifting carrier roller 11, for example, the circumferential surface of a tapered shaft with two large ends and a small middle can form the limiting structure.
Examples
A roll changing device for a perforating machine is disclosed, referring to figure 1, and comprises a supporting device and a disengaging device which are arranged at the back of the perforating machine; an upper roller main transmission system of the perforating machine comprises an upper roller 1, a main transmission shaft 2, a speed reducer 3 and a motor 4, wherein the upper roller 1 and a lower roller 7 form a certain included angle; in FIG. 1, A is the rear position of the main transmission shaft, B is the telescopic spline pair position of the main transmission shaft, C is the middle position of the main transmission shaft, and D is the connecting position of the front part of the main transmission shaft and the tail part of the roller; a support device 5 of the main transmission shaft 2 is arranged at the middle position C of the main transmission shaft 2; at the position B of the telescopic spline pair of the main drive shaft 2, a disengagement device 6 of the main drive shaft 2 is provided.
Referring to the attached drawings 1 and 2, a backward pushing disc 8 and a forward pushing disc 9 are arranged at the position B of the telescopic spline pair of the main transmission shaft 2 and are welded with the telescopic part of the main transmission shaft 2 into a whole.
The supporting device 5: referring to attached drawings 2 and 3, the hydraulic cylinder is arranged in the middle of the main transmission shaft 2 and is used for driving the lifting carrier roller 11, when the perforating machine works, the lifting carrier roller 11 is in a descending position and is not in contact with the main transmission shaft 2, and when the roller is changed, the hydraulic cylinder drives the lifting carrier roller 11 to ascend to support the main transmission shaft 2. The concrete structure is as follows: the lifting carrier roller 11 is of a swing arm type structure, a swing arm is installed on a lifting carrier roller bearing seat 10 through a sliding rotating pair, the swing arm is driven by a lifting carrier roller driving hydraulic cylinder 12 to rotate around the center of the lifting carrier roller bearing seat 10, the lifting carrier roller 11 can be lifted up and down, and the lifting carrier roller bearing seat 10 and the lifting carrier roller driving hydraulic cylinder 12 are installed on a supporting device base 13.
Disengaging device 6: referring to the attached drawings 2 and 4, the hydraulic cylinder is arranged at the middle rear part of the main transmission shaft 2 and is positioned right below the telescopic spline of the main transmission shaft 2, and the hydraulic cylinder is adopted to drive the shifting fork 15 of the U-shaped fork opening to swing, and the specific structure is as follows: the shifting fork 15 is of a swing arm type structure, a swing arm is arranged on a shifting fork bearing seat 16 through a sliding rotating pair, the swing arm is driven by a hydraulic cylinder 17 driven by the shifting fork, the forward and backward swinging of the shifting fork 15 can be realized, a roller 14 is arranged on the inner side of a fork opening of the shifting fork 15, and the center of the roller 14 is approximately superposed with the center of the main transmission shaft 2; when the perforating machine works, the roller 14 is positioned in the middle of the two disks and is not contacted with the disks; both the fork carrier 16 and the fork drive cylinder 17 are mounted on the release base 18.
The specific operation method of the embodiment is as follows: when the roller of the puncher needs to be replaced, the lifting carrier roller driving hydraulic cylinder 12 of the driving device 5 drives the lifting carrier roller 11 to rise to support the main transmission shaft 2, the connecting bolts at the front part of the main transmission shaft 2 and the tail part of the upper roller 1 are manually removed, the shifting fork driving hydraulic cylinder 17 of the main transmission shaft disconnecting device 6 drives the shifting fork 15 to swing backwards, the roller 14 shifts the rear push disc 8 to push the telescopic front part and the middle part of the main transmission shaft 2 to retreat and the tail part of the upper roller 1 to disconnect, the roller is replaced, then the shifting fork driving hydraulic cylinder 17 drives the shifting fork 15 to swing forwards, the roller 14 shifts the front push disc 9 to push the telescopic front part and the middle part of the main transmission shaft 2 to advance and approach the tail part of the upper roller 1, and the connecting bolts for manually connecting the head part of the main transmission shaft 2 and the tail part of the upper roller 1 connect the main transmission shaft 2 and the tail part of the upper roller 1. The lifting carrier roller 11 of the supporting device 5 descends and is not in contact with the main transmission shaft 2, the shifting fork 15 of the main transmission shaft disengaging device 6 swings backwards by a certain angle, and the roller 14 is not in contact with the backward pushing disc 8 and the forward pushing disc 9 of the main transmission shaft 2, so that a cycle process of changing the roller of the perforating machine is completed.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (10)
1. A roll changing device for a perforating machine, characterized in that: comprises a supporting device and a disengaging device which are arranged under a main transmission shaft and are arranged in front and back; the supporting device comprises a lifting carrier roller, the lifting carrier roller is provided with a limiting structure to limit the axial position of the main transmission shaft, the lifting carrier roller is connected with a lifting driving device, and the lifting driving device drives the lifting carrier roller to ascend to support the main transmission shaft; the disengaging device comprises a shifting fork which is just opposite to the position of the telescopic spline of the main transmission shaft, the inner sides of two sides of a fork opening of the shifting fork are relatively provided with idler wheels, a handle part of the shifting fork is hinged on a disengaging device base, a shifting fork driving mechanism is arranged on the disengaging device base, the shifting fork driving mechanism drives the shifting fork to swing by a certain angle around a hinge center of the shifting fork, and the main transmission shaft is stirred to stretch under the action of a front pushing disc and a rear pushing disc which are arranged at the position of the telescopic spline of the main transmission shaft and arranged front and back through the two idler wheels.
2. The roll changing device for a piercing mill according to claim 1, wherein: the action points of the two rollers and the forward pushing disc and the backward pushing disc are centrosymmetric about the central line of the main transmission shaft.
3. The roll changing device for a piercing mill according to claim 1, wherein: and the fork opening of the shifting fork is U-shaped or V-shaped.
4. The roll changing device for a piercing mill according to claim 1, wherein: the lifting driving device is a swinging device, the swinging device comprises a swinging rod which is fixedly connected with the lifting carrier roller and is vertically arranged with the lifting carrier roller, the other end of the swinging rod is hinged on a supporting device base through a rotating shaft which is arranged in parallel with the lifting carrier roller, the rotating shaft is connected with a rotating shaft driving device which drives the rotating shaft driving device to rotate, and the supporting device base is fixed on a ground foundation.
5. The roll changing device for a piercing mill according to claim 4, wherein: the rotating shaft driving device is driven by hydraulic pressure or a motor.
6. The roll changing device for a piercing mill according to claim 1, wherein: the lifting driving device is a vertical lifting device, and the vertical lifting device is a jacking hydraulic cylinder or a lead screw nut transmission mechanism driven by a motor.
7. The roll changing device for a piercing mill according to claim 1, wherein: the shifting fork driving mechanism comprises a linear hydraulic cylinder arranged on a base of the disengaging device, the output end of the linear hydraulic cylinder is hinged with a clamping pin, the clamping pin is in sliding connection with a limiting hole which is located on the shifting fork handle portion and is long in strip shape and is arranged along the length direction of the shifting fork handle portion, and the two ends of the clamping pin are provided with limiting structures to prevent slipping from the limiting hole.
8. The roll changing device for the perforating machine as claimed in claim 1, characterized in that: the forward push disc and the backward push disc are welded with the telescopic shaft section of the main transmission shaft into a whole.
9. The roll changing device for a piercing mill according to claim 1, wherein: the limiting structure is in an inwards concave arc shape or V shape.
10. The roll changing device for a piercing mill according to claim 1, wherein: the lifting carrier roller is a tapered shaft with two large ends and a small middle part, and a limiting structure is formed by the circumferential surface of the lifting carrier roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222717418.7U CN218361323U (en) | 2022-10-12 | 2022-10-12 | Roll changing device for perforating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222717418.7U CN218361323U (en) | 2022-10-12 | 2022-10-12 | Roll changing device for perforating machine |
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| Publication Number | Publication Date |
|---|---|
| CN218361323U true CN218361323U (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222717418.7U Active CN218361323U (en) | 2022-10-12 | 2022-10-12 | Roll changing device for perforating machine |
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| CN (1) | CN218361323U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116851985A (en) * | 2023-09-01 | 2023-10-10 | 烟台万捷新材料股份有限公司 | Welding device for machining steel grating |
-
2022
- 2022-10-12 CN CN202222717418.7U patent/CN218361323U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116851985A (en) * | 2023-09-01 | 2023-10-10 | 烟台万捷新材料股份有限公司 | Welding device for machining steel grating |
| CN116851985B (en) * | 2023-09-01 | 2023-11-03 | 烟台万捷新材料股份有限公司 | Welding device for machining steel grating |
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