Connecting device for metal top beam

Abstract

The connecting device for the metal top beam comprises a concave clamping plate with a downward notch, hinge holes are formed in the left outer side wall and the right outer side wall of the clamping plate, limiting mechanisms are arranged on the front sides and the rear sides of the hinge holes, each limiting mechanism comprises a limiting cylinder, an opening of each limiting cylinder is fixedly connected with the clamping plate, and a first sliding groove is formed in the clamping plate. Limiting columns are slidably connected into the first sliding grooves, the opposite faces of the two limiting columns are inclined faces inclining towards the notch direction of the clamping plate, a shielding plate is arranged at the bottom of the clamping plate in an attached mode, fixing rods are arranged at the top of the shielding plate, the transverse distance between the two fixing rods forms a limiting cylinder fixing space, and a driving mechanism is arranged on the shielding plate. The top beam fixing device has the advantages that a worker can conveniently hinge the two top beams together, the hinged position of the two top beams is protected, falling rocks are prevented from directly falling to the connecting position of the two top beams, and the worker can conveniently disassemble and assemble the shielding plate on the clamping plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine support technical field, concretely point to a kind of connecting device for metal roof beam. BACKGROUND

[0002] In order to prevent the occurrence of top stone falling in coal mine, it is often necessary to use multiple hinged roof beams to fit the top of the mine, and then use support columns below the roof beams for support to protect when the top stone falls. However, the existing roof beams are only hinged by bolts, and there is no buffer at the hinge of the two roof beams when the top stone falls, which directly impacts the hinge of the roof beam, easily causing damage to the roof beam and reducing its service life.

[0003] To solve these technical problems, the existing technology CN218293626U provides a coal mine roof beam connecting device. The staff only needs to hinge connect the corresponding sides of the two roof beams with the device, and then when the rockfall occurs, the shock absorber can buffer the roof beam connection. The setting of the clamping plate can roughly limit the rotation range of the two roof beams to prevent uneven stress on the roof beam due to excessive rotation range. The setting of the shielding plate further limits the two roof beams, allowing them to reach a horizontal state more quickly. The setting of the limiting block and hinge hole facilitates better placement of the roof beam by the staff, preventing eccentricity at the hinge point of the two roof beams. The setting of the shock-absorbing plate facilitates shock-absorbing treatment of the roof beam. The setting of the limiting cylinder, sliding groove, and limiting column facilitates limiting the roof beam. The setting of the elastic buckle and the clamping groove facilitates better disassembly of the shielding plate.

[0004] However, there are certain technical problems in its use, such as: when the device is in use, the staff needs to rotate multiple elastic buckles on the shielding plate one by one to achieve the disassembly and assembly of the shielding plate on the clamping plate. However, this process may cause inconvenience to the staff in use, making it difficult for them to operate the device smoothly. UTILITY MODEL CONTENTS

[0005] The utility model provides a connecting device for metal roof beam that not only facilitates the staff to hinge the two roof beams together and protect the hinge of the two roof beams, but also facilitates the staff to disassemble and assemble the shielding plate on the clamping plate, to address the deficiencies of the prior art.

[0006] The utility model discloses a connecting device for metal roof beam, including concave and notching down clamping plate, the left and right two outer lateral wall of clamping plate is seted up and the hinge hole of its axle direction is perpendicular to the length direction of clamping plate through, the front and back two sides of hinge hole are provided with limit mechanism, the limit mechanism includes the limit cylinder of opening and clamping plate fixed connection, the first sliding slot of being seted up with limit cylinder intercommunication is seted up on the clamping plate, the limit post of sliding connection through spring and limit cylinder fixed is connected in the first sliding slot, the opposite surface of two limit post is the inclined plane of inclining to the notching direction of clamping plate, the bottom of clamping plate is pasted and is provided with the baffle, the top of baffle is provided with the fixed link of abutting with the front and back two lateral walls of limit cylinder, and the transverse distance between two fixed links forms limit cylinder fixed space, be provided with the drive mechanism of making two fixed links move towards on the baffle.

[0007] The utility model discloses a card plate is provided with the first sliding slot and the limiting post in the first sliding slot, and the limiting post is fixed through the spring and the limiting cylinder, and the opposite surface of two limiting posts is the inclined surface that inclines to the recess direction of card plate, and the bottom of card plate is attached with the baffle, the top of baffle is provided with the fixed link that abuts with the front and back two side walls of limiting cylinder, and the transverse distance between two fixed links forms the limiting cylinder fixed space, and the driving mechanism that makes two fixed links move towards each other is provided on the baffle, when using, need first through the control driving mechanism and make two fixed links move in the baffle top direction away from limiting cylinder, so that the front and back two fixed links no longer abut together with the front and back two side walls of limiting cylinder, and then through the control baffle and move down, make limiting cylinder from the limiting cylinder fixed space that the transverse distance between two fixed links formed is separated, then the hinging end of two roof beams is inserted into card plate, and then the staff inserts bolt into hinging hole, so that two roof beams are hinged, when two roof beams are hinged, the staff makes the both ends of card plate swing, and the roof beam is pressed to the inclined surface of limiting post, so that the limiting post moves in the first sliding slot direction limiting cylinder and compresses spring, and then the roof beam enters into the bottom wall and limiting post in card plate, when the roof beam and the inclined surface of limiting post are separated, the limiting post restores to the initial position under the action of spring, so that the roof beam is limited, and then the baffle is moved up, and the baffle returns to the initial position, the limiting cylinder reenters into the limiting cylinder fixed space that the transverse distance between two fixed links formed, then the driving mechanism is controlled, and two fixed links move in the baffle top direction limiting cylinder, so that the front and back two fixed links abut together with the front and back two side walls of limiting cylinder, and the baffle is fixed with card plate again, and two roof beams are further limited, which can conveniently hinge two roof beams together, protect the hinge of two roof beams, avoid falling stone directly falling on the hinge of two roof beams, and conveniently disassemble the baffle on card plate.

[0008] As preferred, the driving mechanism comprises a second sliding groove which is opened on the top of the shielding plate and extends transversely along the length direction of the clamping plate, a rotating rod is arranged in the second sliding groove, two screw grooves are opened on the outer side wall of the rotating rod and are distributed along the length extension direction of the rotating rod, the screw rotation directions of the two screw grooves are opposite, two sliders which are matched with the inner side wall of the second sliding groove are sleeved on the two screw grooves, the top of each slider is fixedly connected with the bottom of each fixed rod, a turbine is fixedly connected with the outer side wall of the rotating rod, a worm is arranged in the second sliding groove and is engaged with the turbine, and the worm extends transversely through the shielding plate to the side of the shielding plate which is away from the clamping block in the direction away from the clamping block. The driving mechanism comprises a second sliding groove which is opened on the top of the shielding plate and extends transversely along the length direction of the clamping plate, a rotating rod is arranged in the second sliding groove, two screw grooves are opened on the outer side wall of the rotating rod and are distributed along the length extension direction of the rotating rod, the screw rotation directions of the two screw grooves are opposite, two sliders which are matched with the inner side wall of the second sliding groove are sleeved on the two screw grooves, the top of each slider is fixedly connected with the bottom of each fixed rod, a turbine is fixedly connected with the outer side wall of the rotating rod, a worm is arranged in the second sliding groove and is engaged with the turbine, and the worm extends transversely through the shielding plate to the side of the shielding plate which is away from the clamping block in the direction away from the clamping block. When the device is used, the turbine in the second sliding groove is driven to rotate by controlling the forward rotation or reverse rotation of the worm in the shielding plate, the rotating rod is driven to rotate in the second sliding groove along with the rotation of the turbine, the screw grooves are driven to rotate, at this time, the front and rear sliders will not be driven to rotate by the front and rear screw grooves because the sliders are matched with the inner side wall of the second sliding groove, but will move in the second sliding groove to be close to or away from the limiting cylinder in the driving of the rotation of the front and rear screw grooves, so as to drive the front and rear fixed rods to move and make the front and rear fixed rods abut against or be separated from the limiting cylinder.

[0009] As preferred, a limiting block is fixedly connected with the inner bottom wall of the clamping plate, and the side of the limiting block which is close to the notch of the clamping plate is an arc-shaped hole which is concentric with the hinge hole and is concave. By fixing the limiting block with the inner bottom wall of the clamping plate, the side of the limiting block which is close to the notch of the clamping plate is an arc-shaped hole which is concentric with the hinge hole and is concave, the limiting block can be used to conveniently place the top beams and prevent the hinge points of the two top beams from being eccentric.

[0010] Preferably, the limiting block is provided with damping plates on the front and back sides, which are fixed to the inner bottom wall of the clamping plate through damping spring shock absorbers, and the left and right side walls of the damping plates are respectively arranged in close contact with the left and right inner side walls of the clamping plate. By arranging damping plates on the front and back sides of the limiting block, which are fixed to the inner bottom wall of the clamping plate through damping spring shock absorbers, and the left and right side walls of the damping plates are respectively arranged in close contact with the left and right inner side walls of the clamping plate, during the process of hinging the two roof beams, the roof beams will compress the damping plates, at this time the spring in the damping spring shock absorber is compressed to a certain extent, when the stones above the coal mine cave fall down, the two roof beams swing relative to each other, at this time the two roof beams further compress the damping plates, thereby absorbing the force on the roof beams through the damping spring shock absorber.

[0011] Preferably, the spring is provided with a connecting rod fixed to the side wall of the limiting cylinder toward the limiting column, one end of the connecting rod extends transversely through the limiting cylinder toward the direction away from the limiting column, and the same side two ends of the connecting rod are fixed to the same pull rod. By arranging a connecting rod in the spring, which is fixed to the side wall of the limiting cylinder toward the limiting column, one end of the connecting rod extends transversely through the limiting cylinder toward the direction away from the limiting column, and the same side two ends of the connecting rod are fixed to the same pull rod, during use, by controlling the pull rod to move away from the clamping plate, the connecting rod fixed thereto also moves away from the clamping plate, thereby making the limiting column move with the connecting rod and compressing the spring, which facilitates the roof beam to enter between the inner bottom wall of the clamping plate and the limiting column.

[0012] Preferably, the worm is fixed at one end away from the shielding plate with a rotating handle. By fixing a rotating handle at one end of the worm away from the shielding plate, the rotating handle can be used to conveniently drive the worm to rotate in the shielding plate.

[0013] Preferably, the shielding plate is provided with connecting rods fixed at one end away from the rotating handle to the left and right worms, and the connecting rods are rotatably connected to the shielding plate. By arranging connecting rods in the shielding plate, which are fixed at one end away from the rotating handle to the left and right worms, and the connecting rods are rotatably connected to the shielding plate, the connecting rods can be used to conveniently drive the left and right turbines to rotate in the left and right second sliding grooves at the same time.

[0014] The utility model discloses an advantageous effect is: through setting concave and notching down clamping plate, the left and right two outer lateral wall of clamping plate is provided with the articulated hole that its axis direction is perpendicular to the length direction of clamping plate and penetrates, the front and back two sides of articulated hole are provided with the limiting mechanism, and the limiting mechanism includes the limiting cylinder of opening and clamping plate fixed connection, and the first sliding slot that clamping plate is provided with and communicates with limiting cylinder, the limiting post that is fixed with limiting cylinder through spring is slidably connected in the first sliding slot, and the opposite surface of two limiting posts is the inclined plane that inclines to the direction of clamping plate recess, and the blocking plate is attached to the bottom of clamping plate, and the fixed link is set up with the abutting of the front and back two side walls of limiting cylinder on the top of blocking plate, and the transverse distance between two fixed links forms limiting cylinder fixed space, and the drive mechanism that makes two fixed links move towards each other is set up on the blocking plate, when the device is in use, need first through control drive mechanism makes two fixed links move in the top of blocking plate and inclines to the direction of limiting cylinder, to this makes the front and back two fixed links no longer abut together with the front and back two side walls of limiting cylinder, again through control blocking plate and moves down, makes limiting cylinder from the limiting cylinder fixed space that the transverse distance between two fixed links formed separates, then inserts the articulated end of two roof beams into clamping plate, and then lets staff insert bolt into articulated hole, to this two roof beams are articulated, when two roof beams are articulated, staff lets clamping plate both ends swing, and the roof beam is pressed to the inclined plane of limiting post, thereby makes limiting post move in the first sliding slot and inclines to the direction of limiting cylinder, and the spring is compressed, and then makes the roof beam enter to the bottom wall between clamping plate and limiting post, when the roof beam and the inclined plane of limiting post separate, under the action of spring, limiting post restores to initial position, thereby the roof beam is positioned, again through control blocking plate and moves up, makes blocking plate return to initial position, and limiting cylinder reenters into the limiting cylinder fixed space that the transverse distance between two fixed links formed, then control drive mechanism again, makes two fixed links move in the top of blocking plate and inclines to the direction of limiting cylinder, thereby makes the front and back two fixed links abut together with the front and back two side walls of limiting cylinder again, makes blocking plate fix with clamping plate again, and the further positioning of two roof beams is carried out, this not only can conveniently staff two roof beams articulate together, protect two roof beam articulated places, avoid rock to drop directly in two roof beam connecting places, but also can facilitate staff to dismount blocking plate on clamping plate. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is structure schematic view of the utility model;

[0016] Figure 2 It is structure perspective view of the utility model;

[0017] Figure 3 It is structure side view of the utility model;

[0018] Figure 4 It is Figure 3 It is structure perspective view of A part in the utility model;

[0019] Figure 5 The structure top view of the utility model;

[0020] Figure 6 The Figure 5 The structure perspective view of B part;

[0021] As shown in the figure:

[0022] 1, card board, 2, shield board, 3, hinge hole, 4, fixed rod, 5, pull rod, 6, worm, 7, rotating handle, 8, limit cylinder, 9, thread groove, 10, sliding block, 11, turbine, 12, second sliding slot, 13, connecting rod, 14, limit block, 15, damping spring shock absorber, 16, shock-absorbing plate, 17, limit column, 18, connecting rod, 19, rotating rod, 20, spring, 21, first sliding slot. DETAILED DESCRIPTION

[0023] To clearly illustrate the technical features of the scheme, the following through specific implementation, the scheme is described.

[0024] As Figures 1-6 The utility model discloses a connecting device for metal roof beam, including concave and concave downward card board 1, the left and right two outer side wall of card board 1 is seted up and the hinge hole 3 of its axis direction is perpendicular to the length direction of card board 1 through, the front and back two sides of hinge hole 3 are provided with limiting mechanism, the limiting mechanism includes the limiting cylinder 8 of the opening and the fixed connection of card board 1, the first sliding slot 21 of communicating with limiting cylinder 8 is seted up on card board 1, the limiting column 17 of being fixed with limiting cylinder 8 through spring 20 is slidably connected in the first sliding slot 21, the opposite surface of two limiting column 17 is the inclined surface of the direction of card board 1 recess direction inclination towards, the bottom of card board 1 is pasted with the shield board 2, the top of shield board 2 is provided with the fixed rod 4 of the abutment of the front and back two side walls of limiting cylinder 8, and the transverse distance between two fixed rod 4 forms the fixed space of limiting cylinder 8, and the driving mechanism of making two fixed rod 4 move towards each other is seted up on shield board 2.

[0025] The driving mechanism comprises a second sliding groove 12 formed in the top of the shielding plate 2 and extending transversely along the length direction of the clamping plate 1, a rotating rod 19 arranged in the second sliding groove 12, two screw grooves 9 formed in the outer side wall of the rotating rod 19 and extending along the length direction of the rotating rod 19, the screw grooves 9 being opposite in screw rotation direction, two sliding blocks 10 fitted on the screw grooves 9 and matched with the inner side wall of the second sliding groove 12, the top of each sliding block 10 being fixedly connected with the bottom of a fixed rod 4, a turbine 11 fixedly connected with the outer side wall of the rotating rod 19, a worm 6 arranged in the second sliding groove 12 and engaged with the turbine 11, the worm 6 extending transversely through the shielding plate 2 and reaching the side of the shielding plate 2 away from the clamping block, and the device is used by controlling the forward rotation or reverse rotation of the worm 6 in the shielding plate 2 to drive the turbine 11 in the second sliding groove 12 to rotate and drive the rotating rod 19 to rotate in the second sliding groove 12, so as to drive the screw grooves 9 to rotate, at this time, the two sliding blocks 10 will not rotate under the driving of the two screw grooves 9 due to the matching of the sliding blocks 10 with the inner side wall of the second sliding groove 12, but will move in the second sliding groove 12 towards or away from the limiting cylinder 8 under the rotating driving of the two screw grooves 9, so as to drive the two fixed rods 4 to move and make the two fixed rods 4 abut against or be separated from the limiting cylinder 8. The limiting block 14 is fixedly connected with the inner bottom wall of the clamping plate 1, the side of the limiting block 14 away from the notch of the clamping plate 1 is an arc-shaped hole 3 concentric with and recessed in the hole 3, the limiting block 14 can be used to conveniently place the top beams and prevent the eccentricity of the hinge joints of the two top beams. The damping plates 16 are fixedly connected with the inner bottom wall of the clamping plate 1 through the damping spring shock absorbers 15 arranged on the front and back sides of the limiting block 14, the left and right side walls of the damping plates 16 are respectively arranged in abutment with the left and right inner side walls of the clamping plate 1, the device is used in the process of hinge connection of the two top beams, the top beams will press the damping plates 16, at this time, the spring 20 in the damping spring shock absorber 15 is compressed to a certain extent, when the stones above the coal mine cave fall down, the two top beams swing relatively, at this time, the two top beams further press the damping plates 16, so that the damping spring shock absorber 15 absorbs and dampens the force received by the top beams. The connecting rods 13 are fixedly connected with the limiting cylinder 17 through the limiting rods 17 arranged in the spring 20, one end of each connecting rod 13 extends transversely through the limiting cylinder 8 away from the limiting rod 17, and the end portions of the connecting rods 13 on the same side are fixedly connected with the same pull rod 5, the device is used by controlling the pull rod 5 to move away from the clamping plate 1, driving the connecting rods 13 fixedly connected with the pull rod 5 to move away from the clamping plate 1, so that the limiting rods 17 move with the connecting rods 13 to compress the spring 20, thereby conveniently enabling the top beams to enter between the inner bottom wall of the clamping plate 1 and the limiting rods 17. The rotating handle 7 is fixedly connected with the end of the worm away from the shielding plate, and the rotating handle 7 can be used to conveniently drive the worm to rotate in the shielding plate.By setting the connecting rod 18 which is fixed with the left and right worm 6 far away from the rotating handle 7 in the shielding plate 2, the connecting rod 18 is rotatably connected with the shielding plate 2, and the connecting rod 18 can conveniently drive the left and right turbines 11 to rotate in the left and right second sliding grooves 12. By setting the fixed rod 4 as an inverted J shape, when the front and rear fixed rods 4 abut against the limiting cylinder 8, the curved part of the fixed rod 4 is hung on the limiting cylinder 8, thereby improving the stability between the shielding plate 2 and the clamping plate 1 during use of the device.

[0026] In combination with the accompanying drawings Figures 1-6The utility model discloses a method as follows: first, reverse rotation is conducted to one rotating handle 7, drives the worm 6 connected therewith to rotate reversely in the baffle 2, and drives the other worm 6 to rotate reversely in the baffle 2 through the transmission of the connecting rod 18, so that the staff drives the turbine 11 in the second sliding slot 12 to rotate, and the rotating rod 19 rotates in the second sliding slot 12 along with the rotation of the turbine 11, to drive the screw groove 9 to rotate, at this time, the sliding block 10 is matched with the inner side wall of the second sliding slot 12, so the two sliding blocks 10 will not rotate under the drive of the two screw grooves 9, but will move in the second sliding slot 12 away from the limiting cylinder 8 under the rotary drive of the two screw grooves 9, to drive the two fixed rods 4 to move, so that the two fixed rods 4 are separated from the limiting cylinder 8, and the two side walls of the limiting cylinder 8 are no longer abutted together, then the baffle 2 is controlled to move downwards, the limiting cylinder 8 is separated from the limiting cylinder 8 fixed space formed by the transverse distance between the two fixed rods 4, then the hinged ends of the two roof beams are inserted into the clamping plate 1, and the staff inserts the bolt into the hinge hole 3, to hinge the two roof beams, when the two roof beams are hinged, the pull rod 5 is controlled to move away from the clamping plate 1, drives the connecting rod 13 connected therewith to move away from the clamping plate 1, so that the limiting column 17 moves in the first sliding slot 21 along with the connecting rod 13, to compress the spring 20, so that the limiting column 17 no longer blocks the roof beam, and the roof beam enters between the bottom wall of the clamping plate 1 and the limiting column 17, when the roof beam enters between the bottom wall of the clamping plate 1 and the limiting column 17, the pull rod 5 is loosened, the limiting column 17 returns to the initial position under the action of the spring 20, to limit the roof beam, then the baffle 2 is controlled to move upwards, the baffle 2 returns to the initial position, the limiting cylinder 8 reenters the limiting cylinder 8 fixed space formed by the transverse distance between the two fixed rods 4, then the other rotating handle 7 is controlled to rotate forward, drives the worm 6 connected therewith to rotate forward in the baffle 2, and drives the other worm 6 to rotate forward in the baffle 2 through the transmission of the connecting rod 18, so that the staff drives the turbine 11 in the second sliding slot 12 to rotate, and the rotating rod 19 rotates in the second sliding slot 12 along with the rotation of the turbine 11, to drive the screw groove 9 to rotate, at this time, the sliding block 10 is matched with the inner side wall of the second sliding slot 12, so the two sliding blocks 10 will not rotate under the drive of the two screw grooves 9, but will move in the second sliding slot 12 towards the limiting cylinder 8 under the rotary drive of the two screw grooves 9, to drive the two fixed rods 4 to move, so that the two fixed rods 4 abut against the two side walls of the limiting cylinder 8 again, the baffle 2 is fixed with the clamping plate 1 again, and the two roof beams are further limited, when the stones above the coal mine cave fall downwards, the two roof beams swing relatively, the two roof beams further compress the damping plate 16,Thus, the force on the roof beam is absorbed and damped by the damper spring 20, the limiting block 14 can facilitate the staff to better place the roof beam, and prevent eccentricity at the hinged point of the two roof beams.

[0027] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using the prior art, which will not be described here; the above examples and drawings are only used to illustrate the technical scheme of the utility model and are not a limitation on the utility model, the preferred embodiments of the utility model are described in detail, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A connecting device for a metal top beam, comprising a concave plate (1) with the notch facing downwards, wherein hinge holes (3) are provided on the left and right outer side walls of the plate (1) with their axial direction perpendicular to the length direction of the plate (1), and limiting mechanisms are provided on the front and rear sides of the hinge holes (3), wherein the limiting mechanisms include limiting cylinders (8) with openings fixed to the plate (1), and a first sliding groove (21) communicating with the limiting cylinder (8) is provided on the plate (1), wherein limiting posts (17) are slidably connected in the first sliding groove (21) and fixed to the limiting cylinder (8) by springs (20), and the opposing surfaces of the two limiting posts (17) are inclined surfaces inclined toward the notch direction of the plate (1), characterized in that: The bottom of the card plate (1) is attached with a shielding plate (2), the top of the shielding plate (2) is provided with a fixed rod (4) abutting against the front and rear sidewalls of the limiting cylinder (8), the transverse distance between the two fixed rods (4) forms a limiting cylinder (8) fixing space, and the shielding plate (2) is provided with a driving mechanism for moving the two fixed rods (4) towards each other.

2. The connection device for a metal roof beam according to claim 1, characterized in that: The driving mechanism comprises a second sliding groove (12) opened in the top of the shielding plate (2) and extending transversely along the length direction of the card plate (1), a rotating rod (19) is arranged in the second sliding groove (12), two threaded grooves (9) are opened in the outer sidewall of the rotating rod (19), the screw threads of the two threaded grooves (9) are opposite in rotation direction, two sliding blocks (10) are sleeved on the two threaded grooves (9) and matched with the inner sidewall of the second sliding groove (12), the top of each sliding block (10) is fixedly connected with the bottom of each fixed rod (4), a turbine (11) is fixedly connected to the outer sidewall of the rotating rod (19), a worm (6) is arranged in the second sliding groove (12) and engaged with the turbine (11), and the worm (6) extends transversely through the shielding plate (2) and to the side of the shielding plate (2) away from the card block.

3. The connection device for a metal roof beam according to claim 1, characterized in that: A limiting block (14) is fixedly connected to the inner bottom wall of the card plate (1), and the side of the limiting block (14) facing the notch of the card plate (1) is an arc-shaped concave hole (3) concentric with the hole.

4. The connection device for a metal roof beam according to claim 3, characterized in that: The front and rear sides of the limiting block (14) are provided with damping plates (16) fixedly connected to the inner bottom wall of the card plate (1) through damping spring shock absorbers (15), and the left and right sidewalls of the damping plates (16) are attached to the left and right inner sidewalls of the card plate (1).

5. The connection device for a metal roof beam according to claim 4, characterized in that: A connecting rod (13) is arranged in the spring (20) and fixedly connected to the sidewall of the limiting cylinder (8) on the side of the limiting column (17), one end of the connecting rod (13) extends transversely through the limiting cylinder (8) away from the limiting column (17), and the end portions of the two connecting rods (13) on the same side are fixedly connected with the same pull rod (5).

6. The connection device for a metal roof beam according to claim 2, characterized in that: The end of the worm (6) away from the shielding plate (2) is fixedly connected with a rotating handle (7).

7. The connection device for a metal roof beam according to claim 5, characterized in that: The shielding plate (2) is provided with connecting rods (18) fixedly connected to the ends of the left and right worms (6) away from the rotating handle (7), and the connecting rods (18) are rotatably connected to the shielding plate (2).

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