CN220998293U - Automatic grabbing device of preheating running frame before welding - Google Patents

Abstract

The utility model discloses an automatic grabbing device for a pre-welding preheating walking frame, which comprises a frame, a lifting driving device, more than two groups of clamping jaws, a clamping jaw moving driving device and a clamping jaw driving device, wherein the lifting frame is arranged on the frame and forms a vertical moving pair with the frame, the lifting driving device is arranged on the frame and is used for driving the lifting frame to vertically move on the frame, the clamping jaws are arranged on the lifting frame and form a horizontal moving pair with the lifting frame, the clamping jaw moving driving device is used for driving the clamping jaws to move on the lifting frame along the length direction of the lifting frame and is used for adjusting the distance between the clamping jaws, and the clamping jaw driving device is used for driving the clamping jaws to move on the lifting frame along the width direction of the lifting frame and is used for clamping the walking frame to be grabbed. The utility model reduces personnel safety problems caused by factors such as labor cost, lifting, high temperature and the like when the material taking and discharging of the travelling crane are subjected to preheating treatment, has high efficiency of taking and discharging the travelling crane, and has the advantage of simple structure.

Description

Automatic grabbing device of preheating running frame before welding

Technical Field

The utility model relates to an automatic grabbing device for a pre-welding preheating travelling crane.

Background

The crane is characterized in that the crane is generally subjected to preheating treatment before welding, preheating material taking and discharging of the crane are not realized by lifting the crane, the crane is hooked and lifted by a lifting hook of the crane, the crane is required to be supported by personnel no matter whether the lifting hook is hooked on the crane or is prevented from swinging in the upward lifting process, no matter whether the swinging of the crane possibly damages personnel or scalds to the personnel due to the high temperature of a preheated workpiece, the potential safety hazards to the personnel are eliminated, and due to the lack of special equipment capable of avoiding the approach of the personnel to operation, the potential safety hazards in the material taking and discharging process of the crane still cannot be eliminated, and due to the lifting of the crane, the personnel needs to move along with the workpiece back and forth, the crane swings in the material taking and discharging process, the stability of the crane is poor, the lifting speed of the crane is generally slow, and the whole efficiency is difficult to be improved.

Disclosure of Invention

The utility model aims to provide an automatic gripping device for a pre-welding preheating crane, which solves the technical defects of low safety and working efficiency in the prior art that the crane is used for hoisting and taking and discharging during the preheating of the crane.

In order to solve the problems, the utility model adopts the following technical scheme: the automatic gripping device for the pre-welding preheating travelling crane comprises a frame, and further comprises a lifting frame, a lifting driving device, more than two groups of gripping claws, a gripping claw moving driving device and a gripping claw driving device, wherein the lifting frame is arranged on the frame and forms a vertical moving pair with the frame, the lifting driving device is arranged on the frame and is used for driving the lifting frame to vertically move on the frame, the gripping claws are arranged on the lifting frame and form a horizontal moving pair with the lifting frame, the gripping claw moving driving device drives the gripping claws to move on the lifting frame along the length direction of the lifting frame and is used for adjusting the distance between the gripping claws, and the gripping claw driving device drives the gripping claws to move on the lifting frame along the width direction of the lifting frame and is used for clamping the travelling crane to be gripped. The utility model adopts the clamping jaw to clamp the row frame to be preheated, the lifting frame and the clamping jaw arranged on the lifting frame are driven by the lifting driving device to lift, so that the clamping jaw clamps the row frame to move in the vertical direction, the clamping jaw moves horizontally on the lifting frame and is used for horizontally moving the row frame so as to be suitable for the row frames with different specifications.

As a further improvement of the utility model, more than one guide rod is fixed on the frame at the two ends of the lifting frame, the two ends of the lifting frame are provided with guide wheels matched with the guide rods, and the guide wheels roll on the guide rods along with the vertical movement of the lifting frame. According to the utility model, the guide rod is arranged on the frame, and the vertical movement of the lifting frame is guided by the cooperation of the guide rod and the guide wheel, so that the vertical movement of the lifting frame is more stable.

As a further improvement of the utility model, the upper and lower sides of the two ends of the lifting frame are respectively provided with a guide wheel mounting frame corresponding to the guide rod, and each guide wheel mounting frame is respectively provided with more than one guide wheel in a rotating way. The guide wheel mounting frame is arranged, so that the guide wheels are convenient to mount, and the guide wheels are arranged on the upper side and the lower side of the lifting frame, so that the stability of vertical movement of the lifting frame can be further improved.

As a further improvement of the utility model, the lifting frame is rotatably provided with a synchronous shaft along the length direction, two ends of the synchronous shaft are respectively provided with a gear A, the guide rods at two ends of the synchronous shaft are respectively fixedly provided with a rack A, the racks A are meshed with the gears A, and the synchronous shaft and the gears A at two ends of the synchronous shaft are synchronously rotated to ensure that the two ends of the lifting frame synchronously lift in the state that the lifting frame vertically moves. According to the utility model, the synchronous shafts are arranged, and the gears A at the two ends of the synchronous shafts and the synchronous shafts synchronously rotate, so that the two ends of the lifting frame can be effectively and synchronously lifted through the engagement of the gears A and the racks A, and the stability of the row frame clamped by the clamping jaw on the lifting frame when the row frame moves vertically along with the lifting frame is improved.

As a further improvement of the utility model, each group of the clamping jaws is arranged on a moving rod arranged along the width direction of the lifting frame, the moving rod is arranged on the lifting frame in a sliding manner and driven by a clamping jaw moving driving device to slide along the length direction of the lifting frame, the clamping jaws are driven by the clamping jaw driving device to slide along the length direction of the moving rod, and the clamping jaw driving device is arranged on the moving rod. According to the utility model, the movable rod is arranged, and the clamping jaw moves along the length direction of the lifting frame relative to the lifting frame through the horizontal movement between the movable rod and the lifting frame, so that the clamping jaw and the lifting frame can be conveniently installed in a sliding manner.

As a further improvement of the utility model, the clamping jaw moving driving device is a clamping jaw driving motor, the clamping jaw driving motor is arranged on the moving rod, a rack B is arranged on the lifting frame along the length direction of the lifting frame, a gear B is arranged on an output shaft of the clamping jaw driving motor, and the gear B is meshed with the rack B and is used for driving the moving rod and the clamping jaw to move on the lifting frame. According to the utility model, the gear B is meshed with the rack B, and when the gear B rotates, the moving rod is driven to move on the lifting frame along the length direction of the lifting frame.

As a further improvement of the utility model, the clamping jaw driving device comprises two clamping jaw driving hydraulic cylinders, each group of clamping jaw comprises two clamping jaw units, the two clamping jaw units are arranged on the moving rod in a sliding manner, the cylinder bodies of the two clamping jaw driving hydraulic cylinders are arranged on the moving rod, the piston rods of the two clamping jaw driving hydraulic cylinders are respectively connected with the two clamping jaw units, and the piston rods of the two clamping jaw driving hydraulic cylinders are respectively used for driving the two clamping jaw units to move on the moving rod and are used for clamping or loosening the row frame to be preheated. According to the utility model, the piston rods of the two clamping jaw driving hydraulic cylinders are used for driving the two clamping jaw units to be close to or far away from each other in a telescopic manner, so that the line frame is clamped and released.

As a further improvement of the utility model, a hydraulic cylinder mounting seat is mounted at the middle part of the moving rod, the cylinder body of the clamping jaw driving hydraulic cylinder is mounted on the hydraulic cylinder mounting seat, and the piston rods of the clamping jaw driving hydraulic cylinders are arranged in directions away from each other. According to the utility model, the hydraulic cylinder mounting seat is arranged on the movable rod, so that the clamping jaw can conveniently drive the hydraulic cylinder to be arranged with the movable rod.

As a further improvement of the utility model, the movable rod is matched with the sliding block by adopting the guide rail to be slidably arranged on the lifting frame, and the clamping jaw is also slidably arranged on the movable rod in a mode of matching the guide rail with the sliding block. According to the utility model, the guide rail is matched with the sliding block, so that the relative sliding between the moving rod and the lifting frame and between the clamping jaw and the moving rod is realized.

As a further improvement of the utility model, the lifting driving device is two hydraulic cylinder lifting driving hydraulic cylinders, two hydraulic cylinder supporting beams are respectively arranged at two ends of the top of the frame, the cylinder bodies of the two hydraulic cylinder lifting driving hydraulic cylinders are respectively arranged on the two hydraulic cylinder supporting beams, the piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders are downwards arranged and respectively connected with two ends of the lifting frame, and the piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders synchronously extend or retract to drive the lifting frame to vertically move. According to the lifting device, the lifting frame is driven to vertically move by stretching the piston rod of the hydraulic cylinder in a lifting manner, the hydraulic cylinder supporting beam is arranged, the hydraulic cylinder lifting driving hydraulic cylinder is convenient to install, the piston rod of the hydraulic cylinder lifting driving hydraulic cylinder can be connected with the middle parts of the two ends of the lifting frame, and the lifting stability of the lifting frame is further improved.

In summary, the beneficial effects of the utility model are as follows: the utility model reduces personnel safety problems caused by factors such as labor cost, lifting, high temperature and the like when the material taking and discharging of the travelling crane are subjected to preheating treatment, has high efficiency of taking and discharging the travelling crane, and has the advantage of simple structure.

Drawings

Fig. 1 is a left side view of the present utility model.

Fig. 2 is a cross-sectional view A-A of fig. 1.

Fig. 3 is a front view of the present utility model.

Fig. 4 is a B-B cross-sectional view of fig. 3.

Fig. 5 is a D-D cross-sectional view of fig. 3.

Fig. 6 is a top view of the present utility model.

Fig. 7 is a C-C cross-sectional view of fig. 6.

Wherein: 1. a frame; 101. an X-direction beam A; 102. a Y-direction cross beam A; 103. a support column; 104. a support plate; 105. a reinforcing plate; 2. a lifting frame; 201. an X-direction beam B; 202. a Y-direction beam B; 3. a lifting driving device; 4. a clamping jaw; 5. a jaw movement drive; 6. jaw drive means; 7. a guide rod; 8. a guide wheel; 9. a guide wheel mounting frame; 10. a synchronizing shaft; 11. a gear A; 12. a rack A; 13. a moving rod; 14. a rack B; 15. a gear B; 16. a hydraulic cylinder mounting seat; 17. a hydraulic cylinder support beam; 18. a connecting rod; 19. a sliding block A; 20. a guide rail A; 21. a guide rail B; 22. and a sliding block B.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings.

The automatic gripping device of the pre-welding preheating walking frame as shown in fig. 1 to 7 comprises a frame 1, a lifting frame 2, a lifting driving device 3, more than two groups of clamping jaws 4, a clamping jaw moving driving device 5 and a clamping jaw driving device 6, wherein the frame 1 comprises two X-direction cross beams A101 which are arranged in parallel, two Y-direction cross beams A102 which are arranged in parallel and four support columns 103, two ends of the two Y-direction cross beams A102 are respectively welded and fixed with two ends of the two X-direction cross beams A101, two ends of the four support columns 103 are respectively welded and fixed with two ends of the two X-direction cross beams A101, a supporting plate 104 is welded and fixed at the bottom of the support column 103 for increasing the contact area with the ground in use, and a plurality of reinforcing plates 105 are welded and fixed at the connecting parts of the support columns 104 and the supporting plate 104 to improve the connecting strength of the two. When the utility model is used, the output ends of the lifting driving device 3, the clamping jaw moving driving device 5 and the clamping jaw driving device 6 can be connected with an intelligent system of a welding bus, and the PLC program is adopted for control so as to realize integral automatic operation.

The lifting frame 2 comprises four X-direction beams B201 which are arranged in parallel and three Y-direction beams B202 which are arranged in parallel, the three Y-direction beams B202 are arranged at equal intervals, two ends of the two Y-direction beams B202 are respectively welded and fixed with two ends of the four X-direction beams B201, two ends of the other Y-direction beams B202 are respectively welded and fixed with the two X-direction beams B201 which are positioned in the middle, the lifting frame 2 is arranged on the Y-direction beam A102 of the frame 1 and forms a vertical moving pair with the frame 1, the lifting driving device 3 is arranged on the frame 1 and used for driving the lifting frame 2 to vertically move on the frame 1, the clamping jaw 4 is arranged on the lifting frame 2 and forms a horizontal moving pair with the lifting frame 2, the clamping jaw 4 is driven to move on the lifting frame 2 in the length direction of the lifting frame 2 in a using state and used for adjusting the distance between the clamping jaws 4 so as to be suitable for clamping the frames to be pre-heated, the clamping jaws 6 are driven to be used for clamping the frames to be pre-heated in different sizes, and the clamping jaws 2 are also driven to move on the lifting frame 2 in the width direction of the lifting frame 2 in the using state, and the clamping jaws 4 are synchronously lifted and the lifting frame 4 are clamped on the lifting frame is arranged in the lifting frame 2 is clamped in the lifting frame is a moving mode.

In order to ensure synchronous lifting of two ends of a lifting frame 2 and improve stability when the lifting frame is clamped, more than one guide rod 7 is fixed on a frame 1 at two ends of the lifting frame 2, namely, the guide rods 7 are arranged on Y-direction cross beams A102, two guide rods 7 are optimally arranged on each Y-direction cross beam A102, protrusions are arranged on one side, away from each other, of the same Y-direction cross beam A102 along the vertical direction, guide wheels 8 matched with the guide rods 7 are arranged on two ends of the lifting frame 2, specifically, the guide wheels 8 are matched with the protrusions on the guide rods 7, the guide wheels 8 roll along the protrusions on the guide rods 7 along with vertical movement of the lifting frame 2, and as the protrusions on the guide rods 7 are arranged on one side, away from each other, of the guide rods 7, the guide wheels 8 guide the vertical movement of the lifting frame 2 and limit the lifting frame 2 along the horizontal direction, so that the lifting frame 2 can only move vertically but cannot move horizontally. In order to facilitate the installation of the guide wheels 8, the upper and lower sides of the Y-direction cross beam B202 at two ends of the lifting frame 2 are fixedly provided with the guide wheel mounting frames 9 corresponding to the guide rods 7, each guide wheel mounting frame 9 is rotatably provided with more than one guide wheel 8, and the guide wheels 8 are rotatably installed on each guide wheel mounting frame 9 in a preferred mode, namely, the upper and lower sides of the lifting frame 2 are provided with the guide wheels 8 matched with the guide rods 7, so that the whole lifting frame 2 has better stability in vertical movement.

According to the utility model, two hydraulic cylinder lifting driving hydraulic cylinders are preferably adopted in the lifting driving device 3, two hydraulic cylinder supporting beams 17 are respectively arranged at the two ends of the top of two X-direction cross beams A101 of a frame 1, namely, the hydraulic cylinder supporting beams 17 are parallel to Y-direction cross beams A102, cylinder bodies of the two hydraulic cylinder lifting driving hydraulic cylinders are respectively detachably arranged at the middle parts of the two hydraulic cylinder supporting beams 17 by bolts, piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders are downwards arranged and respectively connected with the two ends of a lifting frame 2, the piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders synchronously extend or shrink in the vertical direction to drive the lifting frame 2 to vertically move, a connecting rod 18 is welded and fixed between two guide wheel mounting frames 9 positioned below the two Y-direction cross beams B202 at the two ends, and the end parts of the piston rods of the hydraulic cylinder lifting driving hydraulic cylinders are connected with the middle parts of the connecting rod 18. In order to ensure the synchronism of the vertical lifting of the lifting frame 2, the utility model rotationally arranges a synchronizing shaft 10 on the lifting frame 2 along the length direction thereof, the synchronizing shaft 10 passes through three Y-direction cross beams 202 and is rotationally connected with the three Y-direction cross beams 202 by adopting bearings, two ends of the synchronizing shaft 10 are respectively provided with a gear A11, the gear A11 is a straight gear, the guide rods 7 at two ends of the synchronizing shaft 10 are respectively welded and fixed with a rack A12 along the vertical direction, the racks A12 are meshed with the gears A11, and the synchronizing shaft 10 and the gears A11 at two ends thereof synchronously rotate to ensure the synchronous lifting of the two ends of the lifting frame 2 under the state of the vertical movement of the lifting frame 2 so as to make up the problem of the difference of the lifting of the two ends of the lifting frame 2 caused by the difference of the lifting synchronism of the piston rods of the lifting driving hydraulic cylinders, thereby being more beneficial to ensure the stability of clamping the walking frame to be preheated.

In order to facilitate the sliding connection between the clamping jaw 4 and the lifting frame 2, each group of clamping jaw 4 is arranged on a moving rod 13 arranged along the width direction of the lifting frame 2, the moving rod 13 is arranged on the lifting frame 2 in a sliding way and is driven by a clamping jaw moving driving device 5 to slide along the length direction of the lifting frame 2, four sliding blocks A19 are preferably detachably arranged at the top of the moving rod 13 by bolts, a guide rail A20 is respectively detachably arranged at the bottom of each X-direction cross beam B202 by bolts, the four sliding blocks A19 are respectively matched with the four guide rails A20 to realize the sliding connection of the moving rod 13 and the lifting frame 2, the clamping jaw 4 is driven by a clamping jaw driving device 6 to slide along the length direction of the moving rod 13, and the clamping jaw driving device 6 in the utility model is arranged on the moving rod 13. The jaw moving driving device 5 in the utility model preferably adopts a jaw driving motor, the jaw driving motor is arranged at the top of the moving rod 13, a rack B14 is fixedly arranged on the lifting frame 2 along the length direction of the rack B, a gear B15 is arranged on an output shaft of the jaw driving motor, the gear B15 is meshed with the rack B14 and is used for driving the moving rod 13 and the jaw 4 to move on the lifting frame 2, and when the jaw driving motor drives the gear B15 to rotate, the gear B15 is meshed with the rack B14 and is relatively fixed between the rack B14 and the lifting frame 2, so that the moving rod 13 can be driven to move along the length direction of the rack B14.

The clamping jaw driving device 6 comprises two clamping jaw driving hydraulic cylinders, each clamping jaw 4 comprises two clamping jaw units, the two clamping jaw units are arranged on a moving rod 13 in a sliding mode, a guide rail B21 is detachably arranged at the bottom of the moving rod 13 through bolts, more than one sliding block B22 is detachably arranged at the top of the clamping jaw units through bolts, the sliding blocks B22 are matched with the guide rail B21 to realize sliding connection between the clamping jaw units and the moving rod, cylinder bodies of the two clamping jaw driving hydraulic cylinders are arranged on the moving rod 13, piston rods of the two clamping jaw driving hydraulic cylinders are connected with the two clamping jaw units respectively, and piston rods of the two clamping jaw driving hydraulic cylinders are used for driving the two clamping jaw units to move on the moving rod 13 respectively in a telescopic mode and used for clamping or loosening a row frame to be preheated. In order to facilitate the installation of the clamping jaw driving hydraulic cylinders, the middle part of the moving rod 13 is detachably provided with the hydraulic cylinder installation seat 16 by adopting a bolt, the upper part of the hydraulic cylinder installation seat 16 is connected with the moving rod 13, the cylinder bodies of the clamping jaw driving hydraulic cylinders are installed at the lower part of the hydraulic cylinder installation seat 16, the piston rods of the two clamping jaw driving hydraulic cylinders are arranged in the directions far away from each other, the piston rods of the two clamping jaw driving hydraulic cylinders synchronously extend or synchronously shrink, the piston rods of the two clamping jaw driving hydraulic cylinders synchronously extend, the two clamping jaw units are pushed in the directions far away from each other, a row frame clamped by the two clamping jaw units can be constructed, and when the piston rods of the two clamping jaw hydraulic cylinders simultaneously shrink, the two clamping jaw units are pulled in the directions close to each other so as to clamp the row frame to be preheated, and then the row frame is moved in the vertical direction and the horizontal direction by the vertical movement of the lifting frame 2 and the horizontal movement of the moving rod.

Parts of the above description not specifically described are either prior art or may be implemented by prior art. Moreover, the embodiments of the present utility model are described in the preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Equivalent changes and modifications of the utility model are to be considered as technical scope of the present utility model.

Claims (10)

1. The utility model provides a preheating frame automatic grabbing device before welding, includes frame (1), its characterized in that: still include crane (2), lift drive (3), clamping jaw (4) more than two sets of, clamping jaw removes drive (5) and clamping jaw drive (6), crane (2) set up on frame (1) and constitute perpendicular kinematic pair with frame (1), lift drive (3) are installed and are used for driving crane (2) and move perpendicularly on frame (1), clamping jaw (4) set up on crane (2) and constitute horizontal migration pair with crane (2), clamping jaw removes drive (5) drive clamping jaw (4) and remove along the length direction of crane (2) on crane (2) for adjust the distance between clamping jaw (4), clamping jaw drive (6) drive clamping jaw (4) remove along the width direction of crane (2) on crane (2), be used for pressing from both sides the line frame that waits to snatch.

2. The pre-weld preheating rack automatic grabbing device according to claim 1, wherein: more than one guide rod (7) is fixed at the two ends of the lifting frame (2) on the frame (1), guide wheels (8) matched with the guide rods (7) are arranged at the two ends of the lifting frame (2), and the guide wheels (8) roll on the guide rods (7) along with the vertical movement of the lifting frame (2).

3. The pre-weld preheating rack automatic grabbing device according to claim 2, wherein: the upper and lower both sides at crane (2) both ends all are provided with leading wheel mounting bracket (9) corresponding with guide bar (7), are provided with more than one leading wheel (8) on each leading wheel mounting bracket (9) respectively rotates.

4. A pre-weld preheating rack automatic gripping device according to claim 2 or 3, characterized in that: the lifting frame (2) is rotatably provided with a synchronizing shaft (10) along the length direction thereof, two ends of the synchronizing shaft (10) are respectively provided with a gear A (11), the guide rods (7) at two ends of the synchronizing shaft (10) are respectively fixedly provided with a rack A (12), the racks A (12) are meshed with the gears A (11), and the synchronizing shaft (10) and the gears A (11) at two ends thereof synchronously rotate to ensure that the two ends of the lifting frame (2) synchronously lift under the state that the lifting frame (2) vertically moves.

5. The pre-weld preheating rack automatic grabbing device according to claim 1, wherein: each group of clamping jaw (4) is arranged on a moving rod (13) arranged along the width direction of the lifting frame (2), the moving rod (13) is arranged on the lifting frame (2) in a sliding mode, the clamping jaw moving driving device (5) drives the clamping jaw (4) to slide along the length direction of the lifting frame (2), the clamping jaw driving device (6) drives the clamping jaw (4) to slide along the length direction of the moving rod (13), and the clamping jaw driving device (6) is arranged on the moving rod (13).

6. The pre-weld preheating rack automatic grabbing device according to claim 5, wherein: the clamping jaw moving driving device (5) is a clamping jaw driving motor, the clamping jaw driving motor is arranged on the moving rod (13), a rack B (14) is arranged on the lifting frame (2) along the length direction of the lifting frame, a gear B (15) is arranged on an output shaft of the clamping jaw driving motor, the gear B (15) is meshed with the rack B (14) and is used for driving the moving rod (13) and the clamping jaw (4) to move on the lifting frame (2).

7. The pre-weld preheating rack automatic grabbing device according to claim 5 or 6, wherein: the clamping jaw driving device (6) comprises two clamping jaw driving hydraulic cylinders, each clamping jaw (4) comprises two clamping jaw units, the two clamping jaw units are arranged on the moving rod (13) in a sliding mode, cylinder bodies of the two clamping jaw driving hydraulic cylinders are arranged on the moving rod (13), piston rods of the two clamping jaw driving hydraulic cylinders are connected with the two clamping jaw units respectively, and piston rods of the two clamping jaw driving hydraulic cylinders are used for driving the two clamping jaw units to move on the moving rod (13) respectively in a telescopic mode and used for clamping or loosening a row frame to be preheated.

8. The pre-weld preheating rack automatic grabbing device according to claim 7, wherein: the middle part of the movable rod (13) is provided with a hydraulic cylinder mounting seat (16), the cylinder body of the clamping jaw driving hydraulic cylinder is arranged on the hydraulic cylinder mounting seat (16), and the piston rods of the clamping jaw driving hydraulic cylinders are arranged in the direction away from each other.

9. The pre-weld preheating rack automatic grabbing device according to claim 5 or 6, wherein: the movable rod (13) is matched with the sliding block by adopting a guide rail and is slidably arranged on the lifting frame (2), and the clamping jaw (4) is also slidably arranged on the movable rod (13) in a mode of matching the guide rail and the sliding block.

10. The pre-weld preheating rack automatic grabbing device according to claim 1, wherein: the lifting driving device (3) is two hydraulic cylinder lifting driving hydraulic cylinders, two ends of the top of the frame (1) are respectively provided with a hydraulic cylinder supporting beam (17), the cylinder bodies of the two hydraulic cylinder lifting driving hydraulic cylinders are respectively arranged on the two hydraulic cylinder supporting beams (17), the piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders are downwards arranged and respectively connected with two ends of the lifting frame (2), and the piston rods of the two hydraulic cylinder lifting driving hydraulic cylinders synchronously extend or shrink to be used for driving the lifting frame (2) to vertically move.