Plate blank clamp

Abstract

The plate blank clamp comprises a hanging beam and a middle beam, a shutter is arranged between the hanging beam and the middle beam, two clamp arm sets are symmetrically arranged at the bottoms of the two ends of the hanging beam, and the two clamp arm sets are connected through the middle beam; hoisting pulley blocks are arranged at the two ends of the hoisting beam, each hoisting pulley block comprises a first pulley and a second pulley of which the axes are symmetrically distributed on the two sides of the vertical bisection surface of the hoisting beam, and the vertical bisection surface of the hoisting beam is parallel to the length direction of the hoisting beam; the clamp arm set comprises two symmetrically-crossed clamp arms and two symmetrically-crossed connecting rods, the middles of the clamp arms are hinged to the middle beam, clamp teeth are arranged at one ends of the clamp arms, the other ends of the clamp arms are hinged to one ends of the connecting rods, and the other ends of the connecting rods are hinged to the hanging beam. In the advancing process of the bridge crane, the slab clamp is not prone to shaking, the transverse width of the slab clamp is correspondingly reduced, the actual stroke of the bridge crane is closer to the designed stroke of the bridge crane, and then the utilization rate of the plant space is increased.

Description

Technical Field

[0001] The invention relates to the technical field of lifting slings, in particular to a slab clamp. Background Art

[0002] Mechanical slab clamps (gravity clamps) are widely used in the continuous casting workshop of steel mills, the slab warehouse of hot rolling mills, and in stations, freight yards, ports and other places in the transportation industry for the handling and loading and unloading of slabs. Due to its simple structure and convenient maintenance, it is very popular in the industry.

[0003] Mechanical slab clamps are usually used in conjunction with bridge cranes and wire ropes. However, the structure of traditional mechanical slab clamps is Fig.11 As shown in the figure, it is easy to shake during the movement of the bridge crane, and its lateral size is large. This requires that when using the bridge crane in the factory, sufficient distance must be reserved to avoid collision with the side wall of the factory. Therefore, the actual travel of the bridge crane will be significantly smaller than its designed travel, which in turn limits the area in the factory where the slab can be placed. For companies with limited factory space, the impact of this problem is particularly significant. Summary of the invention

[0004] The present invention provides a slab clamp to alleviate the above problems.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A slab clamp comprises: a hanging beam and an intermediate beam, an opener and a closeer are arranged between the hanging beam and the intermediate beam, two clamp arm groups are symmetrically arranged at the bottom of both ends of the hanging beam, and the two clamp arm groups are connected by the intermediate beam;

[0007] Both ends of the suspension beam are provided with a lifting pulley block, the lifting pulley block comprises a first pulley and a second pulley symmetrically distributed on both sides of a vertical bisector of the suspension beam, and the vertical bisector of the suspension beam is parallel to the length direction of the suspension beam;

[0008] The clamp arm group includes two symmetrically crossed clamp arms and two symmetrically crossed connecting rods. The middle part of the clamp arm is hinged to the middle beam. One end of the clamp arm is provided with clamp teeth. The other end of the clamp arm is hinged to one end of the connecting rod. The other end of the connecting rod is hinged to the suspension beam.

[0009] Furthermore, it also includes an anti-sway structure arranged between the suspension beam and the middle beam, and the anti-sway structure is used to restrict the movement of the middle beam relative to the suspension beam in the width direction.

[0010] Furthermore, the anti-sway structure includes two symmetrically arranged first connecting rods and two symmetrically arranged second connecting rods, one end of the first connecting rod is hinged to the middle beam, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the suspension beam;

[0011] The axes of the hinge shafts between the middle beam and the first connecting rod, between the first connecting rod and the second connecting rod, and between the second connecting rod and the suspension beam are parallel to the width direction of the middle beam;

[0012] The two first connecting rods are fixedly connected via a first connecting plate, and the two second connecting rods are fixedly connected via a second connecting plate.

[0013] Furthermore, a plurality of hooks are provided on the outer periphery of the suspension beam.

[0014] Furthermore, the suspension beam is also provided with a hook stopper for preventing the steel wire rope from detaching from the suspension hook, the hook stopper is hinged to the suspension beam, and the hook stopper is located at the hook opening of the suspension hook;

[0015] When the hook stopper is subjected to an external force applied from the hook mouth to the inside of the hook, the hook stopper swings relative to the suspension beam, so that an opening is formed between the hook and the hook stopper to allow the wire rope to enter and exit;

[0016] When the hook stopper is not subjected to the external force applied from the hook mouth to the inside of the hook, the hook stopper is reset under the action of its own weight.

[0017] Furthermore, it also includes a locking device, which includes a fixed support, a rotating support and a connecting rod;

[0018] The fixed support is fixed on the suspension beam, a first pin hole is provided on the fixed support, the rotating support is fixed on the middle beam, one end of the connecting rod is hinged to the rotating support, and the other end of the connecting rod is provided with a second pin hole;

[0019] When the jaws of the pliers arm assembly are opened to a maximum angle, the first pin hole and the second pin hole can be aligned to insert a pin for locking.

[0020] Furthermore, the hook stopper comprises two symmetrically arranged triangular plates, a baffle is fixedly arranged between the two triangular plates, one corner of the triangular plate is hinged to the hanging beam, and the baffle is located at the other corner of the triangular plate;

[0021] When the hook stopper does not bear the external force applied from the hook mouth to the inside of the hook, the baffle abuts against the hook tip of the hook.

[0022] Furthermore, the shutter comprises a base fixed on the middle beam and two ear plates symmetrically arranged on the suspension beam, a limit stopper is arranged between the two ear plates, the ear plate is movably connected to the lock hook plate through a first pin shaft, and a T-shaped locking shaft pin is arranged at the bottom of the lock hook plate;

[0023] The base is opened upward, a stop pin and a triangular hook plate with a concave bottom edge are fixed on the base, the stop pin is located below the triangular hook plate, and the base is hinged to a J-shaped plate with an inclined top edge through a second pin shaft;

[0024] The J-shaped plate can contact the top of the triangular hook plate, the top side of the J-shaped plate can be connected with the top side of the triangular hook plate to form an inclined straight line, and the T-shaped locking shaft pin can slide along the inclined straight line and hook the triangular hook plate;

[0025] The inner side edge of the J-shaped plate can form a gap channel with the inner side edge of the triangular hook plate to allow the T-shaped locking shaft pin to pass from bottom to top;

[0026] It also includes a pointer fixed on the top of the lock hook plate and a scale plate fixed on the suspension beam, and the pointer can follow the swing of the lock hook plate to point to different scales on the scale plate.

[0027] Furthermore, it also includes a trigger, the trigger includes a trigger roller and a trigger rod, and the trigger rod is provided with a long hole;

[0028] The middle beam is provided with a guide hole for allowing the trigger rod to slide up and down, and a limit pin is provided in the long hole, and the limit pin is fixed on the middle beam;

[0029] A limit switch is also provided on the middle beam, the limit switch is located above the trigger rod, and the limit switch is electrically connected to the warning light;

[0030] When the middle beam falls to the lowest limit position, the top end of the trigger rod triggers the limit switch;

[0031] When the middle beam is away from the slab, the trigger rod is reset under the action of its own weight.

[0032] Furthermore, it also includes a first stopper and a second stopper fixed on the clamp arm, wherein the first stopper and the second stopper are located between the clamp teeth and the hinge point between the clamp arm and the middle beam;

[0033] When the jaws of the clamp arm group are opened to the maximum angle, a first stopper on one of the clamp arms abuts against an end of another clamp arm away from the clamp teeth, preventing the jaws from further opening;

[0034] When the jaws of the clamp arm group are closed to a minimum angle, the second stopper on the clamp arm abuts against the middle beam to prevent the jaws from further closing.

[0035] Beneficial effects:

[0036] Different from the slab clamp in the prior art in which only a single row of pulleys is arranged on the hanging beam, the slab clamp disclosed in the present invention arranges the first pulley and the second pulley on the hanging beam, which are symmetrically distributed on both sides of the vertical bisecting plane of the hanging beam, so that when the bridge crane lifts the slab clamp through the steel wire rope on the drum, the steel wire rope can be distributed into two symmetrical paths, and the drum, the first pulley and the second pulley can be distributed in a triangular shape, so that the slab clamp is not easy to shake during the travel of the bridge crane, thereby reducing the distance reserved between the bridge crane and the side wall of the factory building;

[0037] By configuring two symmetrically crossed clamp arms and two symmetrically crossed connecting rods on the clamp arm group, and making the two connecting rods individually hinged to the suspension beam, while ensuring that the maximum and minimum angles of the jaws of the clamp arm group can be opened and closed are the same, compared with the slab clamp in the prior art in which only one hinge point is set on the suspension beam with two connecting rods of a single clamp arm group, the connecting rod length of the slab clamp disclosed in the present invention is shorter, so that the lateral width of the slab clamp is correspondingly reduced, which further reduces the reserved distance between the bridge crane and the side wall of the factory building, makes the actual stroke of the bridge crane closer to its designed stroke, and thereby improves the utilization rate of the factory building space. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a structural schematic diagram of a slab clamp disclosed in the present invention;

[0040] Figure 2 It is a side view schematic diagram of a slab clamp disclosed in the present invention;

[0041] Figure 3 It is a schematic front view of a slab clamp disclosed in the present invention;

[0042] Figure 4 for Figure 2 AA cross-sectional view of ;

[0043] Figure 5 for Figure 3 BB cross-sectional view;

[0044] Figure 6 for Figure 4 An enlarged schematic diagram of point C;

[0045] Figure 7 for Figure 2 An enlarged schematic diagram of point D;

[0046] Figure 8 for Figure 4 An enlarged schematic diagram of point E;

[0047] Fig. 9 It is a schematic diagram of an unlocked state of an opener and shutter of a slab clamp disclosed in the present invention;

[0048] Fig.10 It is a schematic diagram of a locking state of an opener and shutter of a slab clamp disclosed in the present invention;

[0049] Fig.11 It is a structural schematic diagram of an existing slab clamp.

[0050] In the figure:

[0051] 1. Hanging beam;

[0052] 2. Middle beam;

[0053] 3. Clamp arm;

[0054] 4. Connecting rod;

[0055] 5. Opener and closer; 51. Ear plate; 52. First pin; 53. Limit stopper; 54. Lock hook plate; 55. T-shaped locking pin; 56. J-shaped plate; 57. Second pin; 58. Base; 59. Triangular hook plate; 510. Stop pin; 511. Top side of J-shaped plate; 512. Top side of triangular hook plate; 513. Inner side of J-shaped plate; 514. Scale plate; 515. Pointer;

[0056] 6. Hook stopper; 61. Triangular plate; 62. Baffle;

[0057] 7. Locking device; 71. Fixed support; 72. Rotating support; 73. Connecting rod;

[0058] 8. Anti-sway structure; 81. First connecting rod; 82. Second connecting rod; 83. First connecting plate; 84. Second connecting plate;

[0059] 9. Hook;

[0060] 10. trigger; 101. trigger roller; 102. trigger rod; 103. long hole; 104. limit pin;

[0061] 11. First pulley;

[0062] 12. Second pulley;

[0063] 13. First stop;

[0064] 14. Second stop;

[0065] 15. Limit switch;

[0066] 16. Synchronous rod;

[0067] 17. Roller. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] Example 1

[0070] This embodiment provides a slab clamp, such as Figure 1 and Figure 2 As shown, it comprises: a hanging beam 1 and a middle beam 2, an opener 5 is arranged between the hanging beam 1 and the middle beam 2, two clamp arm groups are symmetrically arranged at the bottom of both ends of the hanging beam 1, and the two clamp arm groups are connected through the middle beam 2;

[0071] Both ends of the hanging beam 1 are provided with lifting pulley blocks. Figure 5 As shown, the lifting pulley block comprises a first pulley 11 and a second pulley 12 symmetrically distributed on both sides of a vertical bisector of the hanging beam 1, and the vertical bisector of the hanging beam 1 is parallel to the length direction of the hanging beam 1;

[0072] The clamp arm group includes two symmetrically crossed clamp arms 3 and two symmetrically crossed connecting rods 4. The middle of the clamp arm 3 is hinged to the middle beam 2. One end of the clamp arm 3 is provided with clamp teeth. The other end of the clamp arm 3 is hinged to one end of the connecting rod 4. The other end of the connecting rod 4 is hinged to the suspension beam 1.

[0073] In this embodiment, if Figure 5 As shown, the clamp arm assembly further includes a synchronization rod 16, and both ends of the synchronization rod 16 are respectively hinged to the two clamp arms 3 to ensure that the two clamp arms 3 remain synchronized during the action.

[0074] Compared with the slab clamp (such as Fig.11Different from the above, the slab clamp disclosed in the present invention is provided with a first pulley 11 and a second pulley 12 whose axes are symmetrically distributed on both sides of the vertical bisecting plane of the suspension beam 1, so that when the bridge crane lifts the slab clamp through the steel wire rope on the drum of the bridge crane, the steel wire rope can be distributed into two symmetrical paths, and the drum, the first pulley 11 and the second pulley 12 can be distributed in a triangular shape, so that the slab clamp is not easy to shake during the movement of the bridge crane, thereby reducing the reserved distance between the bridge crane and the side wall of the factory building;

[0075] By configuring two symmetrically crossed clamp arms 3 and two symmetrically crossed connecting rods 4 on the clamp arm group, and making the two connecting rods 4 independently hinged to the hanging beam 1, on the basis of ensuring that the maximum angle and the minimum angle of the jaws of the clamp arm group can be opened and closed are the same, compared with the slab clamp in the prior art in which the two connecting rods of a single clamp arm group are only provided with one hinge point on the hanging beam (such as Fig.11 As shown in the figure, the connecting rod 4 of the slab clamp disclosed in the present invention is shorter, so that the lateral width of the slab clamp is reduced accordingly, which further reduces the distance reserved between the bridge crane and the side wall of the factory building, makes the actual stroke of the bridge crane closer to its designed stroke, and thus improves the utilization rate of the factory building space.

[0076] In a specific embodiment, Figure 3 As shown, it also includes an anti-sway structure 8 disposed between the suspension beam 1 and the middle beam 2, and the anti-sway structure 8 is used to restrict the movement of the middle beam 2 relative to the suspension beam 1 in the width direction;

[0077] In the width direction of the middle beam 2, the top end of the connecting rod 4 is not constrained, which may cause the middle beam 2 to swing relative to the hanging beam 1 during the movement of the bridge crane. Therefore, an anti-sway structure 8 is provided to constrain and prevent the middle beam 2 from swinging relative to the hanging beam 1. Compared with the existing slab clamps, this design not only further reduces the reserved distance between the bridge crane and the side wall of the factory building, but also ensures that the opener 5 between the hanging beam 1 and the middle beam 2 can be accurately positioned for normal use.

[0078] In a specific embodiment, Figure 4 As shown, the anti-sway structure 8 includes two symmetrically arranged first connecting rods 81 and two symmetrically arranged second connecting rods 82, one end of the first connecting rod 81 is hinged to the middle beam 2, the other end of the first connecting rod 81 is hinged to one end of the second connecting rod 82, and the other end of the second connecting rod 82 is hinged to the suspension beam 1. In this embodiment, a first support hinged to the first connecting rod 81 is welded to the middle beam 2, and a second support hinged to the second connecting rod 82 is welded to the suspension beam 1;

[0079] The axes of the hinge shafts between the middle beam 2 and the first connecting rod 81, between the first connecting rod 81 and the second connecting rod 82, and between the second connecting rod 82 and the suspension beam 1 are parallel to the width direction of the middle beam 2;

[0080] The two first connecting rods 81 are fixed by welding via a first connecting plate 83 , and the two second connecting rods 82 are fixed by welding via a second connecting plate 84 .

[0081] In a specific embodiment, Figure 2 and Figure 3 As shown, a plurality of hooks 9 are welded to the outer periphery of the hanging beam 1;

[0082] For enterprises with limited production conditions (limited factory space or limited equipment investment), it is difficult to install additional lifting equipment in the factory. Therefore, a hook 9 is added to the lifting beam 1. When the slab is not being lifted, other components can be directly hung through the hook 9 in combination with a separate wire rope.

[0083] In a specific embodiment, Figure 3 As shown, the hanging beam 1 is also provided with a hook stopper 6 for preventing the steel wire rope from escaping from the hook 9, the hook stopper 6 is hinged to the hanging beam 1, and the hook stopper 6 is located at the hook mouth of the hook 9;

[0084] When the hook stopper 6 is subjected to an external force applied from the hook mouth to the inside of the hook, the hook stopper 6 swings relative to the suspension beam 1, so that an opening is formed between the hook 9 and the hook stopper 6 to allow the wire rope to enter and exit;

[0085] When the hook stopper 6 is not subjected to the external force applied from the hook mouth to the inside of the hook, the hook stopper 6 is reset under the action of its own weight;

[0086] In actual use, when it is necessary to hook the wire rope, the operator can move the hook stopper 6 to put the wire rope into the hook, and when it is necessary to remove the wire rope, the operator can move the hook stopper 6 again to take the wire rope out of the hook.

[0087] In a specific embodiment, Figure 1 As shown, it also includes a locking device 7, such as Figure 3 As shown, the locking device 7 includes a fixed support 71, a rotating support 72 and a connecting rod 73;

[0088] The fixed support 71 is welded and fixed on the suspension beam 1, and a first pin hole is provided on the fixed support 71. The rotating support 72 is welded and fixed on the middle beam 2. One end of the connecting rod 73 is hinged to the rotating support 72, and the other end of the connecting rod 73 is provided with a second pin hole.

[0089] When the jaws of the clamp arm assembly are opened to the maximum angle, the operator rotates the connecting rod 73 so that the first pin hole and the second pin hole can be aligned to insert a pin for locking. In actual use, a bolt can be inserted into the first pin hole and the second pin hole instead of the pin for locking.

[0090] When the hook 9 is used for lifting, in order to prevent the middle beam 2 from accidentally touching the machines or workpieces stacked in the factory and causing the closer 5 to open, so that the jaws of the clamp arm group can shrink freely and the clamp arm 3 extends downward and hits the machine or workpiece, a locking device 7 is provided so that when the hook 9 is used for lifting, the middle beam 2 and the lifting beam 1 remain locked.

[0091] In a specific embodiment, Figure 6 As shown, the hook stopper 6 includes two symmetrically arranged triangular plates 61, a baffle 62 is welded between the two triangular plates 61, one corner of the triangular plate 61 is hinged to the hanging beam 1, and the baffle 62 is located at the other corner of the triangular plate 61;

[0092] When the hook stopper 6 is not subjected to the external force applied from the hook mouth to the inside of the hook, the baffle 62 abuts against the hook tip of the hook 9 .

[0093] In a specific embodiment, Figure 1 As shown, it also includes a trigger 10, such as Figure 7 As shown, the trigger 10 includes a trigger roller 101 and a trigger rod 102, and the trigger rod 102 is provided with a long hole 103;

[0094] In this embodiment, if Figure 7 As shown, two rollers 17 are also provided at the bottom of the middle beam 2 to prevent the steel structure of the middle beam 2 from directly colliding with the slab;

[0095] The middle beam 2 is provided with a guide hole for allowing the trigger rod 102 to slide up and down, and a limit pin 104 is provided in the long hole 103. The limit pin 104 is fixed on the middle beam 2, and the limit pin 104 prevents the trigger rod 102 in the guide hole from being separated from the middle beam 2;

[0096] The intermediate beam 2 is also provided with a limit switch 15, which is located above the trigger rod 102, and the limit switch 15 is electrically connected to the warning light in the driver's cab;

[0097] When the middle beam 2 falls to the lowest limit position (i.e., the middle beam 2 falls to the position where the bottom abuts against the slab and cannot fall further), the trigger roller 101 in contact with the slab drives the top of the trigger rod 102 to trigger the limit switch 15, and the warning light comes on to remind the driver that the slab clamp is in place;

[0098] When the middle beam 2 is away from the slab, the trigger rod 102 is reset under the action of its own weight and away from the limit switch 15 .

[0099] In a specific embodiment, Figure 2 As shown, it also includes a first stopper 13 and a second stopper 14 welded and fixed on the clamp arm 3, and the first stopper 13 and the second stopper 14 are located between the clamp teeth and the hinge point between the clamp arm 3 and the middle beam 2;

[0100] When the jaws of the clamp arm group are opened to the maximum angle, the first stopper 13 on one of the clamp arms 3 abuts against the end of the other clamp arm 3 away from the clamp teeth, preventing the jaws from opening further;

[0101] When the jaws of the clamp arm group are closed to the minimum angle, the second stopper 14 on the clamp arm 3 abuts against the middle beam 2 to prevent the jaws from further closing;

[0102] The maximum angle and the minimum angle correspond to the extreme opening and closing positions of the jaws of the clamp arm assembly. The first stopper 13 and the second stopper 14 prevent the jaws from opening too large or too small, thereby effectively preventing damage to the slab clamps.

[0103] Example 2

[0104] This embodiment provides a slab clamp, the main structure of which is the same as that of Embodiment 1, and the difference between this embodiment and Embodiment 1 is as follows:

[0105] In this embodiment, if Figures 8 to 10 As shown, the shutter 5 comprises a base 58 fixed on the middle beam 2 and two ear plates 51 symmetrically welded and fixed on the suspension beam 1, a limit stopper 53 is provided between the two ear plates 51, the ear plate 51 is movably connected to the lock hook plate 54 through a first pin shaft 52, and a T-shaped locking shaft pin 55 is provided at the bottom of the lock hook plate 54;

[0106] The base 58 opens upward, and a stop pin 510 and a triangular hook plate 59 with a concave bottom edge are fixed on the base 58. The stop pin 510 is located below the triangular hook plate 59. The base 58 is hinged to the J-shaped plate 56 with an inclined top edge through a second pin shaft 57.

[0107] The J-shaped plate 56 can contact the top of the triangular hook plate 59, the top side 511 of the J-shaped plate can be connected with the top side 512 of the triangular hook plate to form an inclined straight line, and the T-shaped locking pin 55 can slide along the inclined straight line and hook the triangular hook plate 59;

[0108] The inner side edge 513 of the J-shaped plate can form a gap channel with the inner side edge of the triangular hook plate 59 to allow the T-shaped locking shaft pin 55 to pass from bottom to top;

[0109] It also includes a pointer 515 fixed on the top of the lock hook plate 54 and a dial 514 fixed on the suspension beam 1 . The pointer 515 can follow the swing of the lock hook plate 54 to point to different scales on the dial 514 .

[0110] In this embodiment, the structure of the switch 5 is the same as that of the "lifting sling switch" in Patent No. CN101372307B except for the pointer 515 and the dial 514. The specific working principle will not be described in detail here, and only the purpose of the newly added pointer 515 and the dial 514 will be explained;

[0111] The dial 514 should be provided with at least two scales corresponding to the locked and unlocked states of the switch. The pointer 515 swings with the lock hook plate 54 and points to the corresponding scale. The operator of the bridge crane can judge the state of the switch by observing the pointer 515.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slab clamp, comprising: A hanging beam (1) and an intermediate beam (2), wherein an opener (5) is provided between the hanging beam (1) and the intermediate beam (2), two clamp arm groups are symmetrically provided at the bottom of both ends of the hanging beam (1), and the two clamp arm groups are connected through the intermediate beam (2), characterized in that: Both ends of the suspension beam (1) are provided with a lifting pulley block, the lifting pulley block comprising a first pulley (11) and a second pulley (12) symmetrically distributed on both sides of a vertical bisector of the suspension beam (1), the vertical bisector of the suspension beam (1) being parallel to the length direction of the suspension beam (1); The clamp arm group comprises two symmetrically crossed clamp arms (3) and two symmetrically crossed connecting rods (4); the middle part of the clamp arm (3) is hinged to the middle beam (2); one end of the clamp arm (3) is provided with clamp teeth; the other end of the clamp arm (3) is hinged to one end of the connecting rod (4); and the other end of the connecting rod (4) is hinged to the suspension beam (1).

2. The slab clamp according to claim 1, characterized in that: It also includes an anti-sway structure (8) arranged between the suspension beam (1) and the middle beam (2), wherein the anti-sway structure (8) is used to restrict the movement of the middle beam (2) relative to the suspension beam (1) in the width direction.

3. The slab clamp according to claim 1, characterized in that: The anti-sway structure (8) comprises two symmetrically arranged first connecting rods (81) and two symmetrically arranged second connecting rods (82), one end of the first connecting rod (81) is hinged to the middle beam (2), the other end of the first connecting rod (81) is hinged to one end of the second connecting rod (82), and the other end of the second connecting rod (82) is hinged to the suspension beam (1); The axes of the hinge shafts between the middle beam (2) and the first connecting rod (81), between the first connecting rod (81) and the second connecting rod (82), and between the second connecting rod (82) and the suspension beam (1) are parallel to the width direction of the middle beam (2); The two first connecting rods (81) are fixedly connected via a first connecting plate (83), and the two second connecting rods (82) are fixedly connected via a second connecting plate (84).

4. The slab clamp according to claim 1, characterized in that: A plurality of hooks (9) are provided on the outer periphery of the suspension beam (1).

5. The slab clamp according to claim 4, characterized in that: The hanging beam (1) is also provided with a hook stopper (6) for preventing the steel wire rope from detaching from the hanging hook (9); the hook stopper (6) is hinged to the hanging beam (1), and the hook stopper (6) is located at the hook mouth of the hanging hook (9); When the hook stopper (6) is subjected to an external force applied from the hook mouth to the inside of the hook, the hook stopper (6) swings relative to the suspension beam (1), so that an opening is formed between the hook (9) and the hook stopper (6) to allow the steel wire rope to enter and exit; When the hook stopper (6) does not bear the external force applied from the hook mouth to the inside of the hook, the hook stopper (6) is reset under the action of its own weight.

6. The slab clamp according to claim 4, characterized in that: It also includes a locking device (7), wherein the locking device (7) includes a fixed support (71), a rotating support (72) and a connecting rod (73); The fixed support (71) is fixed on the suspension beam (1), and a first pin hole is provided on the fixed support (71); the rotating support (72) is fixed on the intermediate beam (2); one end of the connecting rod (73) is hinged to the rotating support (72), and the other end of the connecting rod (73) is provided with a second pin hole; When the jaws of the pliers arm assembly are opened to a maximum angle, the first pin hole and the second pin hole can be aligned to insert a pin for locking.

7. The slab clamp according to claim 1, characterized in that: The hook stopper (6) comprises two symmetrically arranged triangular plates (61), a baffle (62) is fixedly arranged between the two triangular plates (61), one corner of the triangular plate (61) is hinged to the hanging beam (1), and the baffle (62) is located at the other corner of the triangular plate (61); When the hook stopper (6) is not subjected to external force applied from the hook mouth to the inside of the hook, the baffle (62) abuts against the hook tip of the hook (9).

8. The slab clamp according to claim 1, characterized in that: The shutter (5) comprises a base (58) fixed on the middle beam (2) and two ear plates (51) symmetrically arranged on the suspension beam (1), a limit stopper (53) is arranged between the two ear plates (51), the ear plates (51) are movably connected to the lock hook plate (54) through a first pin shaft (52), and a T-shaped locking shaft pin (55) is arranged at the bottom of the lock hook plate (54); The base (58) is open upwards, a stop pin (510) and a triangular hook plate (59) with a concave bottom edge are fixed on the base (58), the stop pin (510) is located below the triangular hook plate (59), and the base (58) is hinged to a J-shaped plate (56) with an inclined top edge through a second pin shaft (57); The J-shaped plate (56) can contact the top end of the triangular hook plate (59), the top side edge of the J-shaped plate (56) can be connected with the top side edge of the triangular hook plate (59) to form an inclined straight line, and the T-shaped locking shaft pin (55) can slide along the inclined straight line and hook the triangular hook plate (59); The inner side edge of the J-shaped plate (56) can form a slit channel with the inner side edge of the triangular hook plate (59) to allow the T-shaped locking shaft pin (55) to pass from bottom to top; It also comprises a pointer (515) fixed on the top of the lock hook plate (54) and a dial (514) fixed on the suspension beam (1); the pointer (515) can follow the swing of the lock hook plate (54) to point to different scales on the dial (514).

9. The slab clamp according to claim 1, characterized in that: It also comprises a trigger (10), wherein the trigger (10) comprises a trigger roller (101) and a trigger rod (102), and the trigger rod (102) is provided with an elongated hole (103); The middle beam (2) is provided with a guide hole for allowing the trigger rod (102) to slide up and down, and a limit pin (104) is provided in the long hole (103), and the limit pin (104) is fixed on the middle beam (2); The intermediate beam (2) is also provided with a limit switch (15), the limit switch (15) is located above the trigger rod (102), and the limit switch (15) is electrically connected to the warning light; When the middle beam (2) falls to the lowest limit position, the top end of the trigger rod (102) triggers the limit switch (15); When the middle beam (2) is away from the slab, the trigger rod (102) is reset under the action of its own weight.

10. The slab clamp according to claim 1, characterized in that: It also comprises a first stopper (13) and a second stopper (14) fixed on the clamp arm (3), wherein the first stopper (13) and the second stopper (14) are located between the clamp teeth and the hinge point between the clamp arm (3) and the middle beam (2); When the jaws of the clamp arm group are opened to a maximum angle, a first stopper (13) on one of the clamp arms (3) abuts against an end of another clamp arm (3) away from the clamp teeth, thereby preventing the jaws from further opening; When the jaws of the clamp arm group are closed to a minimum angle, the second stopper (14) on the clamp arm (3) abuts against the middle beam (2) to prevent the jaws from continuing to close.

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