CN219852749U - Intelligent welding robot workstation for oil cylinder for engineering machinery - Google Patents

Intelligent welding robot workstation for oil cylinder for engineering machinery Download PDF

Info

Publication number
CN219852749U
CN219852749U CN202320763116.5U CN202320763116U CN219852749U CN 219852749 U CN219852749 U CN 219852749U CN 202320763116 U CN202320763116 U CN 202320763116U CN 219852749 U CN219852749 U CN 219852749U
Authority
CN
China
Prior art keywords
oil cylinder
welding robot
guide
welded
seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202320763116.5U
Other languages
Chinese (zh)
Inventor
朱小明
张丰裕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Auto Automation Co ltd
Original Assignee
Nanjing Auto Automation Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Auto Automation Co ltd filed Critical Nanjing Auto Automation Co ltd
Priority to CN202320763116.5U priority Critical patent/CN219852749U/en
Application granted granted Critical
Publication of CN219852749U publication Critical patent/CN219852749U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Machines For Laying And Maintaining Railways (AREA)

Abstract

The utility model relates to an intelligent welding robot workstation for an oil cylinder of engineering machinery, which comprises a welding robot (2), a bracket (3), a deflection device (4) and a preheating device (5), wherein the welding robot (2) is matched with an oil cylinder (1) to be welded, the welding robot (2) is fixed on a trolley (6), the trolley (6) is connected on a travelling slide rail (7) in a sliding way, the bottom of the oil cylinder (1) to be welded is arranged on a group of brackets (3) which are parallel to each other, two ends of the oil cylinder (1) to be welded are clamped between a driving rotary deflection machine (41) and a driven rotary deflection machine (42), the side surface of the oil cylinder (1) to be welded is provided with the preheating device (5), and the preheating device (5) comprises an automatic feeding device (51), a manual fine adjustment device (52) and a heating device (53). The utility model has the advantages of improving the welding efficiency and safety of the oil cylinder, improving the labor intensity of workers, saving the cost of human resources, reducing the requirements on the operation technology of the workers and ensuring the welding quality of the oil cylinder.

Description

Intelligent welding robot workstation for oil cylinder for engineering machinery
Technical Field
The utility model relates to the technical field of automatic welding equipment, in particular to an intelligent welding robot workstation for an oil cylinder for engineering machinery.
Background
The hydro-cylinder generally comprises cylinder, cylinder bottom chassis, cylinder bottom welding piece and glib, need weld above-mentioned each position in the in-process of manufacturing the hydro-cylinder, and the diameter of hydro-cylinder for engineering machine tool is generally at 200~1000mm, and the longest reaches 6m, adopts manual welding or semi-automatic welding generally at present, but the group when large-scale barrel welds is to and deformation control when welding is comparatively difficult, and welding robot welding operation visual angle scope is little simultaneously, to 360 circumference welding of large-scale barrel longitudinal joint, and the construction is comparatively difficult, does not have comparatively suitable frock to guarantee welding quality, has seriously restricted production efficiency, and intensity of labour is big simultaneously, and work efficiency is low.
Disclosure of Invention
The utility model aims to solve the problems of high welding difficulty, low efficiency and difficult quality assurance of the existing oil cylinder, and provides an intelligent welding robot workstation for an oil cylinder for engineering machinery, which improves the welding efficiency of the oil cylinder, improves the labor intensity of workers, saves the labor resource cost, reduces the requirements on the operation technology of the workers, improves the safety of welding work and ensures the welding quality of the oil cylinder.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the intelligent welding robot workstation for the oil cylinder for the engineering machinery comprises a welding robot matched with an oil cylinder to be welded, a bracket, a deflection device and a preheating device, wherein the welding robot is fixed on a trolley, and the trolley is connected onto a travelling crane sliding rail on one side of the oil cylinder to be welded in a sliding manner so that the robot can move along the sliding rail to weld a position to be welded of the oil cylinder;
the bottom of the cylinder to be welded is arranged on a group of brackets which are parallel to each other, the brackets comprise a main body bracket, a lifting motor is arranged in the main body bracket, the output end of the lifting motor is connected with a horizontal transmission shaft, the two ends of the transmission shaft are respectively connected with a vertical lifting shaft through connecting pieces, a horizontal lifting plate is connected to the lifting shaft, a guide rail seat is fixed on the lifting plate, a pair of supporting wheel mounting seats are connected to the guide rail seat, the two support wheel mounting seats form sliding guide fit, and each supporting wheel mounting seat is connected with a supporting wheel so as to adjust the distance between the supporting wheels through moving the mounting seats;
the two ends of the cylinder to be welded are connected to a displacement device, the displacement device comprises a driving rotary displacement machine and a driven rotary displacement machine which are matched with each other, a three-jaw chuck is connected to the driving rotary displacement machine, a rotary center is connected to the driven rotary displacement machine, the rotary center is arranged opposite to the center shaft of the three-jaw chuck, and the two are positioned on the same axis so as to clamp the cylinder to be welded between the chuck and the center;
the side surface of the cylinder to be welded is provided with a preheating device which is fixed on a trolley of the welding robot and comprises an automatic feeding device, a manual fine adjustment device and a heating device, wherein the automatic feeding device comprises a feeding motor, a feeding connecting rod and a feeding platform, a horizontal sliding seat is connected to the feeding platform, the feeding motor, the feeding connecting rod and the feeding platform form sliding guide fit, and one end of the sliding seat is connected with the feeding connecting rod so as to drive the sliding seat to move along the feeding platform through the feeding motor;
the manual fine adjustment device is connected to the sliding seat and comprises a screw rod sliding rail mechanism arranged in the fine adjustment box body, the screw rod sliding rail mechanism is connected with the coil mounting seat and forms sliding guide fit with the coil mounting seat, and one end of the screw rod sliding rail mechanism penetrates out of the fine adjustment box body to be connected with a fine adjustment handle so as to be used for controlling the fine adjustment distance of the sliding seat through rotating the handle;
the heating device comprises a heating control box and a C-shaped induction heating coil which are connected, the heating control box is fixed on a coil mounting seat, the C-shaped induction heating coil is arranged towards a cylinder to be welded, a gap which is arranged along a central line is formed in the C-shaped induction heating coil, the length of the gap is smaller than that of the central line of the C-shaped induction heating coil, a horizontal notch is formed in the middle of the C-shaped induction heating coil, the width of the notch is half of the width of the C-shaped induction heating coil, and the notch is connected with the middle point of the gap so as to be used for uniformly preheating a welding part on the cylinder to be welded.
Further, still be equipped with a walking motor in the main part support of bracket, the bottom plate that the vertical downwardly-directed bracket of output of walking motor was worn out links to each other with a walking gear, the below of bracket is equipped with the removal slide rail with walking gear matched with, the below of main part support still has a pair of tripod, the tripod is located the both sides of bottom plate and is parallel to the removal slide rail setting, every tripod has the guide holder towards one side of removing the slide rail even, be equipped with the guide way in the guide holder, the removal slide rail has the guide block towards one side of tripod even, the guide block inlays in the guide way for the spacing effect of direction is played.
Further, the three-jaw chuck rotates around the center shaft and is connected with three chuck guide rails, the chuck guide rails are uniformly distributed on the three-jaw chuck in a radial mode around the center shaft, each chuck guide rail is connected with a jaw block, the two jaw blocks form sliding guide fit, and one side of each jaw block, facing the center shaft, is provided with anti-slip stripes for increasing friction force of the jaw clamping cylinder.
Further, the live center comprises a columnar structure and a conical center which are integrally formed, and the central connecting line of the conical center and the three-jaw chuck is parallel to the central line between the two supporting wheels, so that the axis of the oil cylinder is ensured to coincide with the central line of the equipment.
Further, welding robot locates one side of waiting to weld the oil cylinder, and the opposite side of waiting to weld the oil cylinder still is equipped with the walking board, and the walking board is parallel to the removal slide rail setting to the operating personnel observes the welding condition of monitoring.
According to the technical scheme, the automatic lifting centering of the oil cylinder can be realized by adjusting the height of the bracket and the distance between the supporting wheels, the three-jaw electric chuck of the driving rotary chuck positioner has an automatic centering function, and the three-jaw electric chuck is matched with the rotary center on the driven rotary positioner for use, so that the center line of the oil cylinder can be quickly determined, and a workpiece can be conveniently clamped; meanwhile, the device can realize that the oil cylinder with the length of 3 meters and the weight of less than 1 ton can be normally used in a one-card-one-top mode under the condition of not using the bracket for supporting, thereby meeting the welding of some special workpieces of users. The workstation improves the welding efficiency of the oil cylinder, improves the labor intensity of workers, saves the cost of human resources, reduces the requirements on the operation technology of the workers and improves the safety of welding work.
Drawings
FIG. 1 is an overall assembly diagram of an intelligent welding robot workstation for an oil cylinder for engineering machinery;
FIG. 2 is a schematic view of a bracket structure according to the present utility model;
FIG. 3 is a schematic diagram of an active rotary positioner according to the present utility model;
FIG. 4 is a schematic view of a driven rotary positioner according to the present utility model;
fig. 5 is a schematic structural diagram of a preheating device according to the present utility model.
Detailed Description
Examples
In order to make the present utility model more clear, the following description of an intelligent welding robot workstation for an oil cylinder for engineering machinery according to the present utility model is provided by way of illustration only and not by way of limitation.
Referring to fig. 1, an intelligent welding robot workstation for an oil cylinder for engineering machinery comprises a welding robot 2 matched with an oil cylinder 1 to be welded, a bracket 3, a deflection device 4 and a preheating device 5, wherein the welding robot 2 is fixed on a trolley 6, and the trolley 6 is slidably connected on a travelling crane slide rail 7 on one side of the oil cylinder 1 to be welded, and is characterized in that:
referring to fig. 1 and 2, the bottom of the cylinder 1 to be welded is arranged on a group of brackets 3 parallel to each other, the brackets 3 comprise a main body bracket 30, a lifting motor 31 is arranged in the main body bracket 30, the output end of the lifting motor 31 is connected with a horizontal transmission shaft 32, two ends of the transmission shaft 32 are respectively connected with a vertical lifting shaft 34 through a connecting piece 33, a horizontal lifting plate 35 is connected to the lifting shaft 34, a guide rail seat 36 is fixed on the lifting plate 35, a pair of supporting wheel mounting seats 37 are connected to the guide rail seat 36, sliding guide fit is formed between the guide rail seat and the supporting wheel mounting seats, and a supporting wheel 38 is connected to each supporting wheel mounting seat 37 so as to adjust the distance between the supporting wheels by moving the mounting seats;
a traveling motor 39 is further arranged in the main body support 30 of the bracket 3, the output end of the traveling motor 39 vertically penetrates through the bottom plate 310 of the bracket 3 downwards to be connected with a traveling gear 311, a movable sliding rail 8 matched with the traveling gear 311 is arranged below the bracket 3, a pair of triangular frames 312 are further connected below the main body support 30, the triangular frames 312 are arranged on two sides of the bottom plate 310 and are parallel to the movable sliding rail 8, a guide seat 313 is connected to one side, facing the movable sliding rail 8, of each triangular frame 312, a guide groove 313a is formed in the guide seat 313, a guide block 8a is connected to one side, facing the triangular frame 312, of the movable sliding rail 8, and the guide block 8a is embedded in the guide groove 313a so as to play a role in guide limiting;
referring to fig. 1 and 3, two ends of an oil cylinder 1 to be welded are connected to a displacement device 4, the displacement device 4 comprises a driving rotary displacement machine 41 and a driven rotary displacement machine 42 which are mutually matched, the driving rotary displacement machine 41 is connected with a three-jaw chuck 411, the three-jaw chuck 411 rotates around a central shaft 411a and is connected with three chuck guide rails 4111, the chuck guide rails 4111 are uniformly distributed on the three-jaw chuck 411 in a radial manner around the central shaft 411a, each chuck guide rail 4111 is connected with a jaw block 4112, the two blocks form sliding guide fit, and one side of each jaw block 4112 facing the central shaft is provided with an anti-skid stripe 4112a for increasing friction force of the jaw clamping oil cylinder;
referring to fig. 1, 3 and 4, the driven rotary positioner 42 is connected with a rotary center 421, the rotary center 421 comprises a columnar structure 4211 and a conical center 4212 which are integrally formed, and the central connecting line of the conical center 4212 and the three-jaw chuck 411 is parallel to the central line between the two supporting wheels 38, so as to ensure that the axis of the oil cylinder coincides with the central line of the equipment;
referring to fig. 1 and 5, a preheating device 5 is arranged on the side surface of the oil cylinder 1 to be welded, the preheating device 5 is fixed on a trolley 6 of the welding robot 2, the preheating device comprises an automatic feeding device 51, a manual fine adjustment device 52 and a heating device 53, the automatic feeding device 51 comprises a feeding motor 511, a feeding connecting rod 512 and a feeding platform 513, a horizontal sliding seat 54 is connected to the feeding platform 513, the two sliding seats form sliding guide fit, and one end of the sliding seat 54 is connected with the feeding connecting rod 512 for driving the sliding seat to move along the feeding platform through the feeding motor;
the manual fine adjustment device 52 is connected to the sliding seat 54, and comprises a screw rod sliding rail mechanism 522 arranged in the fine adjustment box 521, wherein the screw rod sliding rail mechanism 522 is connected with the coil mounting seat 55 and forms sliding guiding fit with the coil mounting seat, and one end of the screw rod sliding rail mechanism 522 penetrates out of the fine adjustment box 521 to be connected with a fine adjustment handle 523 for controlling the fine adjustment distance of the sliding seat through a rotating handle;
the heating device 53 comprises a heating control box 531 and a C-shaped induction heating coil 532 which are connected, the heating control box 531 is fixed on a coil mounting seat 55, the C-shaped induction heating coil 532 is arranged towards a cylinder 1 to be welded, a gap 532a which is arranged along a central line is arranged on the heating control box 531, the length of the gap 532a is smaller than that of the central line of the C-shaped induction heating coil 532, a horizontal notch 532b is arranged in the middle of the C-shaped induction heating coil 532, the width of the notch 532b is half of that of the C-shaped induction heating coil 532, and the notch 532b is connected with the middle point of the gap 532a so as to be used for uniformly preheating a welding part on the cylinder to be welded;
referring to fig. 1, the welding robot 2 is disposed on one side of the cylinder 1 to be welded, a walking board 9 is disposed on the other side of the cylinder 1 to be welded, and the walking board 9 is parallel to the moving slide rail 8, so that an operator can observe and monitor welding conditions.
In use, the device of the utility model can be operated according to the following steps:
(1) According to the specification of the oil cylinder to be welded, the brackets 3 can automatically adjust the distance between the two brackets 3 to a proper position; the distance between the supporting wheels 38 and the height of the lifting plate 35 are adjusted so as to ensure that the axis of the oil cylinder coincides with the center line of the equipment;
(2) The cylinder 1 to be welded is hoisted on the supporting wheel 38 of the bracket 3, and the bracket 3 is manually controlled to axially walk until one end of the cylinder contacts the three-jaw chuck 411. One end of an electric three-jaw chuck clamping cylinder on the active rotary positioner 41 is controlled; the other end controls the driven rotary positioner 42 to walk, and the rotary center 421 is used for propping up the oil cylinder and fixing;
(3) The welding robot trolley with the preheating device 5 is driven to a preheating position, the automatic preheating device is started, the C-shaped induction heating coil 532 is matched with a positioner to rotate for uniformly preheating a welding part, and the preheating device 5 is controlled to retract to the initial position after the preheating is finished;
(4) Automatically starting a welding robot trolley to a welding position, automatically calling a welding program according to current oil cylinder information by a system, and automatically welding the clamped oil cylinders by the welding robot;
(5) After the welding is finished, the trolley of the welding robot automatically opens to a proper position so that the oil cylinders are not interfered when being lifted out;
(6) The driven rotary positioner is controlled to retract manually, the driving rotary positioner loosens the clamping jaw, the bracket is moved to a proper lifting position, and the pipe fitting is safely lifted out by using the lifting appliance.
The device can realize the automatic functions of lifting centering, axial propping, chuck clamping, rotation, weld preheating and robot welding of the oil cylinder with the diameter of 200-1000 mm and the longest length of 6m, improve the welding efficiency and operation safety of the oil cylinder, improve the labor intensity of workers, save the labor resource cost, reduce the requirement on the operation technology of the workers and ensure the welding quality of the oil cylinder.
In addition to the embodiments described above, other embodiments of the utility model are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the utility model.

Claims (5)

1. The utility model provides an intelligent welding robot workstation of hydro-cylinder for engineering machine tool, includes with wait to weld jar (1) complex welding robot (2), bracket (3), positioner (4) and preheating device (5), and welding robot (2) are fixed in on platform truck (6), and platform truck (6) sliding connection is on driving slide rail (7) of waiting to weld jar (1) one side, its characterized in that:
the bottom of the cylinder (1) to be welded is arranged on a group of brackets (3) which are parallel to each other, the brackets (3) comprise a main body bracket (30), a lifting motor (31) is arranged in the main body bracket (30), the output end of the lifting motor (31) is connected with a horizontal transmission shaft (32), two ends of the transmission shaft (32) are respectively connected with a vertical lifting shaft (34) through connecting pieces (33), a horizontal lifting plate (35) is connected to the lifting shaft (34), a guide rail seat (36) is fixed to the lifting plate (35), a pair of supporting wheel mounting seats (37) are connected to the guide rail seat (36), sliding guide matching is formed between the guide rail seat and the pair of supporting wheel mounting seats, and a supporting wheel (38) is connected to each supporting wheel mounting seat (37);
the two ends of the cylinder (1) to be welded are connected to a displacement device (4), the displacement device (4) comprises a driving rotary displacement machine (41) and a driven rotary displacement machine (42) which are mutually matched, a three-jaw chuck (411) is connected to the driving rotary displacement machine (41), a rotary center (421) is connected to the driven rotary displacement machine (42), and the rotary center (421) is arranged opposite to the middle shaft of the three-jaw chuck (411) and is positioned on the same axis;
the side of the cylinder (1) to be welded is provided with a preheating device (5), the preheating device (5) is fixed on a trolley (6) of the welding robot (2), the preheating device comprises an automatic feeding device (51), a manual fine adjustment device (52) and a heating device (53), the automatic feeding device (51) comprises a feeding motor (511), a feeding connecting rod (512) and a feeding platform (513), a horizontal sliding seat (54) is connected to the feeding platform (513), the two sliding seats form sliding guide fit, and one end of the sliding seat (54) is connected with the feeding connecting rod (512);
the manual fine adjustment device (52) is connected to the sliding seat (54) and comprises a screw rod sliding rail mechanism (522) arranged in the fine adjustment box body (521), the screw rod sliding rail mechanism (522) is connected with the coil mounting seat (55) and forms sliding guide fit with the coil mounting seat, and one end of the screw rod sliding rail mechanism (522) penetrates out of the fine adjustment box body (521) to be connected with a fine adjustment handle (523);
heating device (53) are including continuous heating control box (531) and C type induction heating coil (532), heating control box (531) are fixed on coil mount pad (55), C type induction heating coil (532) are towards waiting to weld jar (1) setting, and be equipped with gap (532 a) of a setting along the central line on it, the length of gap (532 a) is less than the central line length of C type induction heating coil (532), the middle part of C type induction heating coil (532) is equipped with a horizontally breach (532 b), the width of breach (532 b) is half of C type induction heating coil (532) width, and breach (532 b) links to each other with the midpoint of gap (532 a).
2. The intelligent welding robot workstation for an oil cylinder for engineering machinery according to claim 1, wherein:
the novel walking device is characterized in that a walking motor (39) is further arranged in a main body support (30) of the bracket (3), the output end of the walking motor (39) vertically penetrates out of a bottom plate (310) of the bracket (3) downwards to be connected with a walking gear (311), a movable sliding rail (8) matched with the walking gear (311) is arranged below the bracket (3), a pair of triangular brackets (312) are further connected below the main body support (30), the triangular brackets (312) are arranged on two sides of the bottom plate (310) and are parallel to the movable sliding rail (8), a guide seat (313) is connected to one side of each triangular bracket (312) facing the movable sliding rail (8), a guide groove (313 a) is formed in each guide seat (313), and a guide block (8 a) is embedded in each guide groove (313 a) and is connected to one side of each movable sliding rail (8) facing the triangular bracket (312).
3. The oil cylinder intelligent welding robot workstation for engineering machinery according to claim 1 or 2, characterized in that:
the three-jaw chuck (411) rotates around a central shaft (411 a) and is connected with three chuck guide rails (4111), the chuck guide rails (4111) are uniformly distributed on the three-jaw chuck (411) in a radial mode around the central shaft (411 a), each chuck guide rail (4111) is connected with a jaw block (4112) which forms sliding guide fit, and one side, facing the central shaft (411 a), of each jaw block (4112) is provided with an anti-slip stripe (4112 a).
4. The oil cylinder intelligent welding robot workstation for engineering machinery according to claim 1 or 2, characterized in that:
the rotary center (421) comprises a columnar structure (4211) and a conical center (4212) which are integrally formed, and the central connecting line of the conical center (4212) and the three-jaw chuck (411) is parallel to the central line between the two supporting wheels (38).
5. The oil cylinder intelligent welding robot workstation for engineering machinery according to claim 1 or 2, characterized in that:
the welding robot (2) is arranged on one side of the cylinder (1) to be welded, a walking board (9) is arranged on the other side of the cylinder (1) to be welded, and the walking board (9) is arranged parallel to the movable sliding rail (8).
CN202320763116.5U 2023-04-10 2023-04-10 Intelligent welding robot workstation for oil cylinder for engineering machinery Active CN219852749U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320763116.5U CN219852749U (en) 2023-04-10 2023-04-10 Intelligent welding robot workstation for oil cylinder for engineering machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320763116.5U CN219852749U (en) 2023-04-10 2023-04-10 Intelligent welding robot workstation for oil cylinder for engineering machinery

Publications (1)

Publication Number Publication Date
CN219852749U true CN219852749U (en) 2023-10-20

Family

ID=88321865

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320763116.5U Active CN219852749U (en) 2023-04-10 2023-04-10 Intelligent welding robot workstation for oil cylinder for engineering machinery

Country Status (1)

Country Link
CN (1) CN219852749U (en)

Similar Documents

Publication Publication Date Title
CN204080138U (en) The automatic prestripping device of a kind of novel colored metal level for negative plate
CN116275739A (en) Intelligent welding robot workstation for oil cylinder for engineering machinery
CN109176567A (en) Gear carries detection assistance mechanical arm
CN2754796Y (en) Arm automatic build-up welder of roller
CN110745691A (en) Method for repairing universal shaft of vertical rolling mill and special tool
CN219852749U (en) Intelligent welding robot workstation for oil cylinder for engineering machinery
CN114634098A (en) Track part replacing and hoisting device and operation method thereof
CN109290908A (en) Two-sided sanding machine for trapezoidal rails
CN210147358U (en) Support arrangement suitable for shaped steel welding process, upset
CN217458481U (en) Track component hoisting device
CN218050983U (en) Robot welding equipment for large oil cylinder
CN105537962A (en) Special equipment for large cylinder butt milling and welding
CN213289380U (en) Rolling slats door axis of rotation welding equipment of polishing
CN114715777A (en) Track component hoisting device and operation method thereof
CN212823663U (en) Welding machine for small-sized roller
CN210150580U (en) Multi-functional handling clamping device suitable for shaped steel transport
CN103722114A (en) Hot die forging machine forge piece transporting device
CN210099198U (en) Semi-automatic resistance welding gun for inner end of steel coil
CN202607181U (en) Crankshaft fillet rolling machine
CN106391881A (en) Quick hoisting type mold changing trolley and mold changing method thereof
CN112643221A (en) Special cutting equipment of multi-functional nodular cast iron
CN217965224U (en) ESP production line hot roll way collector pipe welding system
CN210147153U (en) Chassis cutting machine
CN220998293U (en) Automatic grabbing device of preheating running frame before welding
CN214114686U (en) Main shaft hoisting device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant