Plate blank clamp

Abstract

The utility model discloses a plate blank clamp which 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 utility model relates to hoist technology field especially relates to slab tongs. BACKGROUND

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

[0003] Mechanical slab tongs are usually used with bridge cranes and steel wire ropes. However, the structure of the traditional mechanical slab tongs, as shown in Figure 11 , is prone to sway during the movement of the bridge crane, and its transverse dimension is large. This requires that when a bridge crane is used in a factory building, sufficient distance must be reserved to avoid collision with the side wall of the factory building. Therefore, the actual travel of the bridge crane will be significantly less than its designed travel, thereby limiting the area in the factory building where slabs can be placed. For enterprises with limited factory space, the impact of this problem is particularly significant. SUMMARY

[0004] The utility model provides a kind of slab tongs to alleviate the above problems.

[0005] To achieve the above purpose, the technical scheme of the utility model is:

[0006] A slab tong includes a hoist beam and an intermediate beam, an opening and closing device is provided between the hoist beam and the intermediate beam, two tong arm groups are symmetrically provided at the bottom of both ends of the hoist beam, and the two tong arm groups are connected by the intermediate beam.

[0007] A hoist pulley block is provided at both ends of the hoist beam, the hoist pulley block includes a first pulley and a second pulley that are symmetrically distributed on both sides of a vertical bisector plane of the hoist beam, and the vertical bisector plane of the hoist beam is parallel to the length direction of the hoist beam.

[0008] The tong arm group includes two symmetrically intersecting tong arms and two symmetrically intersecting connecting rods, the middle part of the tong arm is hinged to the intermediate beam, one end of the tong arm is provided with a tong tooth, the other end of the tong arm is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the hoist beam.

[0009] Further, a sway prevention structure is provided between the hoist beam and the intermediate beam, and the sway prevention structure is used to constrain the movement of the intermediate beam relative to the hoist beam in the width direction.

[0010] Further, the anti-swing structure comprises two symmetrically arranged first connecting rods and two symmetrically arranged second connecting rods, one end of the first connecting rod is hingedly connected with the intermediate beam, the other end of the first connecting rod is hingedly connected with one end of the second connecting rod, and the other end of the second connecting rod is hingedly connected with the hanging beam;

[0011] The axes of the hinge shafts of the intermediate beam, the first connecting rod, the second connecting rod and the hanging beam are parallel to the width direction of the intermediate beam.

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

[0013] Further, a plurality of hooks are arranged on the outer periphery of the hanging beam.

[0014] Further, a hook stopper for preventing the steel wire rope from being separated from the hook is further arranged on the hanging beam, the hook stopper is hingedly connected with the hanging beam, and the hook stopper is located at the hook opening of the hook.

[0015] When the hook stopper bears an external force applied from the hook opening to the hook, the hook stopper swings relative to the hanging beam, so that an opening allowing the steel wire rope to enter and exit is formed between the hook and the hook stopper.

[0016] When the hook stopper does not bear the external force applied from the hook opening to the hook, the hook stopper is reset under the action of gravity.

[0017] Further, a locking device is further included, the locking device comprises a fixed support, a rotating support and a connecting rod;

[0018] The fixed support is fixed on the hanging beam, the fixed support is provided with a first pin hole, the rotating support is fixed on the intermediate beam, one end of the connecting rod is hingedly connected with the rotating support, and the other end of the connecting rod is provided with a second pin hole.

[0019] When the jaw opening of the jaw group is opened to the maximum angle, the first pin hole and the second pin hole can be aligned to insert a pin for locking.

[0020] Further, 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 hingedly connected with 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 opening to the hook, the baffle abuts against the hook tip of the hook.

[0022] Further, the shutter comprises a base fixed on the middle beam and two ear plates symmetrically arranged on the hanging beam, a limiting block is arranged between the two ear plates, the ear plates are movably connected with the hook plate through a first pin shaft, and a T-shaped locking shaft pin is arranged at the bottom of the hook plate;

[0023] The base is upwardly open, a blocking pin and a triangular hook plate with an inwardly recessed bottom edge are fixed on the base, the blocking pin is located below the triangular hook plate, and a J-shaped plate with an inclined top edge is hingedly connected to the base through a second pin shaft;

[0024] The J-shaped plate can be in contact with the top tip 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 of the J-shaped plate can form a gap channel allowing the T-shaped locking shaft pin to pass from bottom to top with the inner side of the triangular hook plate;

[0026] A pointer fixed on the top of the hook plate and a scale disc fixed on the hanging beam are further included, the pointer can swing to point to different scales on the scale disc.

[0027] Further, a trigger is further included, the trigger comprises a trigger roller and a trigger lever, and a long hole is arranged on the trigger lever;

[0028] A guide hole allowing the trigger lever to slide up and down is arranged on the middle beam, a limiting pin is arranged in the long hole, and the limiting pin is fixed on the middle beam;

[0029] A limiting switch is further arranged on the middle beam, the limiting switch is located above the trigger lever, and the limiting switch is electrically connected with a warning lamp;

[0030] When the middle beam is placed to the lowest limit position, the top end of the trigger lever triggers the limiting switch;

[0031] When the middle beam is away from the plate blank, the trigger lever is reset under the action of gravity.

[0032] Further, a first stopper and a second stopper fixed on the arm are further included, the first stopper and the second stopper are located between the jaw teeth and the hinge point of the arm and the middle beam;

[0033] When the jaw opening of the arm group is opened to the maximum angle, the first stopper on one of the arms abuts against the end of the other arm away from the jaw teeth, so as to block the jaw opening from being continuously opened;

[0034] When the jaws of the clamp arm assembly close to the minimum angle, the second stop on the clamp arm abuts against the intermediate beam, preventing the jaws from closing further.

[0035] Beneficial effects:

[0036] Unlike existing slab clamps that only have a single row of pulleys on the lifting beam, the slab clamp disclosed in this utility model has a first pulley and a second pulley symmetrically distributed on both sides of the vertical bisecting plane of the lifting beam. This allows the wire rope on the drum to be distributed into two symmetrical paths when the bridge crane lifts the slab clamp, and the drum, the first pulley, and the second pulley can be triangularly distributed. This makes the slab clamp less prone to swaying during the movement 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 intersecting clamp arms and two symmetrically intersecting connecting rods on the clamp arm assembly, and making each connecting rod individually hinged to the lifting beam, while ensuring that the maximum and minimum opening angles of the clamp jaws of the clamp arm assembly are the same, compared with the slab clamps in the prior art where the two connecting rods of a single clamp arm assembly only have one hinge point on the lifting beam, the connecting rod length of the slab clamp disclosed in this utility model is shorter, thereby reducing the lateral width of the slab clamp. This further reduces the distance reserved between the bridge crane and the side wall of the factory building, making the actual stroke of the bridge crane closer to its design stroke, and thus improving the utilization rate of the factory space. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a slab clamp disclosed in this utility model;

[0040] Figure 2 This is a side view of a slab clamp disclosed in this utility model;

[0041] Figure 3 This is a front view schematic diagram of a slab clamp disclosed in this utility model;

[0042] Figure 4 for Figure 2 AA sectional view;

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

[0044] Figure 6 is a zoomed-in view of C of Figure 4 ;

[0045] Figure 7 is a zoomed-in view of D of Figure 2 ;

[0046] Figure 8 is a zoomed-in view of E of Figure 4 ;

[0047] Figure 9 is a schematic view of the unlocking state of the shutter of the slab clamp disclosed by the present application;

[0048] Figure 10 is a schematic view of the locking state of the shutter of the slab clamp disclosed by the present application;

[0049] Figure 11 is a schematic view of the structure of the existing slab clamp.

[0050] In the drawings:

[0051] 1. a hanging beam;

[0052] 2. a middle beam;

[0053] 3. a clamp arm;

[0054] 4. a connecting rod;

[0055] 5. a shutter; 51, an ear plate; 52, a first pin shaft; 53, a limiting stopper; 54, a lock hook plate; 55, a T-shaped lock shaft pin; 56, a J-shaped plate; 57, a second pin shaft; 58, a base; 59, a triangular hook plate; 510, a blocking pin; 511, a top side edge of the J-shaped plate; 512, a top side edge of the triangular hook plate; 513, an inner side edge of the J-shaped plate; 514, a scale disc; 515, a pointer;

[0056] 6. a hook stopper; 61, a triangular plate; 62, a baffle;

[0057] 7. a locking device; 71, a fixed support; 72, a rotating support; 73, a connecting rod;

[0058] 8. an anti-swing structure; 81, a first connecting rod; 82, a second connecting rod; 83, a first connecting plate; 84, a second connecting plate;

[0059] 9. a hook;

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

[0061] 11. a first pulley;

[0062] 12. second pulley;

[0063] 13. first stop;

[0064] 14. second stop;

[0065] 15. limit switch;

[0066] 16. synchronization rod;

[0067] 17. roller. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0069] Embodiment 1

[0070] The embodiment provides a slab clamp, as shown in Figure 1 and Figure 2 It comprises a hanging beam 1 and an intermediate beam 2, a shutter 5 is arranged between the hanging beam 1 and the intermediate 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 intermediate beam 2.

[0071] Both ends of the hanging beam 1 are provided with a hoisting pulley block, as shown in Figure 5 The hoisting pulley block comprises a first pulley 11 and a second pulley 12 which are symmetrically distributed on both sides of a vertical bisector plane of the hanging beam 1, and the vertical bisector plane of the hanging beam 1 is parallel to the length direction of the hanging beam 1.

[0072] The clamp arm group comprises two symmetrically intersecting clamp arms 3 and two symmetrically intersecting connecting rods 4, the middle part of the clamp arm 3 is hinged to the intermediate beam 2, one end of the clamp arm 3 is provided with a clamp tooth, 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 hanging beam 1.

[0073] In the embodiment, as shown in Figure 5 The clamp arm group further comprises a synchronization rod 16, both ends of the synchronization rod 16 are respectively hinged to the two clamp arms 3, and the two clamp arms 3 are ensured to keep synchronization during the action.

[0074] Compared with the slab clamp in the prior art which only sets a single pulley on the hanging beam (as shown in Figure 11The utility model discloses a billet clamp, through setting up the first pulley 11 and the second pulley 12 of axis symmetry distribution in the vertical bisector surface both sides of the hanging beam 1, when the steel wire rope of the drum of bridge crane is lifted, the steel wire rope can be distributed into two symmetrical ways, the drum, the first pulley 11 and the second pulley 12 can be triangular distribution, so that the billet clamp is not easy to sway in the process of bridge crane, and the distance that the bridge crane and factory building lateral wall reserve can reduce further,

[0075] Through the configuration of two symmetrical cross jaw arms 3 and two symmetrical cross connecting rods 4 on the jaw arm group, and the two connecting rods 4 are individually hinged with the hanging beam 1, on the basis of ensuring that the maximum angle and minimum angle of the jaw opening of the jaw arm group are the same, compared with the billet clamp in the prior art (such as Figure 11 The utility model discloses a billet clamp, through setting up the first pulley 11 and the second pulley 12 of axis symmetry distribution in the vertical bisector surface both sides of the hanging beam 1, when the steel wire rope of the drum of bridge crane is lifted, the steel wire rope can be distributed into two symmetrical ways, the drum, the first pulley 11 and the second pulley 12 can be triangular distribution, so that the billet clamp is not easy to sway in the process of bridge crane, and the distance that the bridge crane and factory building lateral wall reserve can reduce further,

[0076] In specific embodiments, as shown in Figure 3 It further includes the anti-swing structure 8 arranged between the hanging beam 1 and the intermediate beam 2, and the anti-swing structure 8 is used for restricting the movement of the intermediate beam 2 relative to the hanging beam 1 in the width direction;

[0077] In the width direction of the intermediate beam 2, the top end of the connecting rod 4 is not restricted, which leads to the shaking of the intermediate beam 2 relative to the hanging beam 1 in the process of the movement of the bridge crane. Therefore, the anti-swing structure 8 is arranged to restrict the shaking of the intermediate beam 2 relative to the hanging beam 1. Compared with the existing billet clamp, the design not only further reduces the distance reserved between the bridge crane and the factory building lateral wall, but also ensures the accurate positioning of the shutter 5 between the hanging beam 1 and the intermediate beam 2 for normal use.

[0078] In specific embodiments, as shown in Figure 4 The anti-swing 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 with the intermediate beam 2, the other end of the first connecting rod 81 is hinged with one end of the second connecting rod 82, and the other end of the second connecting rod 82 is hinged with the hanging beam 1. In the embodiment, the intermediate beam 2 is welded with a first support hinged with the first connecting rod 81, and the hanging beam 1 is welded with a second support hinged with the second connecting rod 82;

[0079] The axis of the hinge shaft of the intermediate beam 2, the first connecting rod 81, the second connecting rod 82 and the hanging beam 1 is parallel to the width direction of the intermediate beam 2;

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

[0081] In specific embodiments, as shown in Figure 2 and Figure 3 A plurality of hooks 9 are welded on 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 set up additional lifting equipment in the factory, so the hooks 9 are added to the hanging beam 1, and when the plate blank is not lifted, other components can be directly hung by the hooks 9 in cooperation with a separate steel wire rope.

[0083] In specific embodiments, as shown in Figure 3 A hook stop 6 for blocking the steel wire rope from disengaging from the hook 9 is further arranged on the hanging beam 1, the hook stop 6 is hinged to the hanging beam 1, and the hook stop 6 is located at the hook opening of the hook 9;

[0084] When the hook stop 6 bears an external force applied from the hook opening to the hook, the hook stop 6 swings relative to the hanging beam 1, so that an opening allowing the steel wire rope to enter and exit is formed between the hook 9 and the hook stop 6;

[0085] When the hook stop 6 does not bear an external force applied from the hook opening to the hook, the hook stop 6 is reset under the action of gravity;

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

[0087] In specific embodiments, as shown in Figure 1 Further comprising a locking device 7, as shown in Figure 3 The locking device 7 comprises a fixed support 71, a rotating support 72 and a connecting rod 73;

[0088] The fixed support 71 is welded and fixed on the hanging beam 1, the fixed support 71 is provided with a first pin hole, the rotating support 72 is welded and 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;

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

[0090] When using the hook 9 for lifting, in order to prevent the intermediate beam 2 from accidentally touching the machines or workpieces stacked in the factory and causing the opening and closing device 5 to open, which would allow the jaws of the clamp arm assembly to retract freely and cause the clamp arm 3 to extend downward and hit the machine or workpiece, a locking device 7 is set up so that the intermediate beam 2 and the lifting beam 1 remain locked when the hook 9 is used for lifting.

[0091] In a specific embodiment, such as Figure 6 As shown, the hook stop 6 includes two symmetrically arranged triangular plates 61, and a baffle 62 is welded between the two triangular plates 61. One corner of the triangular plate 61 is hinged to the lifting beam 1, and the baffle 62 is located at the other corner of the triangular plate 61.

[0092] When the hook stop 6 does not bear the external force applied from the hook opening to the hook inside, the baffle 62 abuts against the hook tip of the hook 9.

[0093] In a specific embodiment, such as Figure 1 As shown, it also includes 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 an elongated hole 103;

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

[0095] The intermediate beam 2 is provided with a guide hole that allows the trigger rod 102 to slide up and down. The elongated hole 103 is provided with a limiting pin 104. The limiting pin 104 is fixed on the intermediate beam 2 and prevents the trigger rod 102 in the guide hole from separating from the intermediate beam 2.

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

[0097] When the intermediate beam 2 is lowered to the lowest limit position (that is, when the intermediate beam 2 is lowered to the bottom and touches the slab, and can no longer fall), 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 illuminates to remind the driver that the slab clamp is in place.

[0098] When the intermediate beam 2 moves away from the slab, the trigger rod 102 resets under its own weight and moves away from the limit switch 15.

[0099] In a specific embodiment, such as Figure 2 As shown, it also includes a first stop 13 and a second stop 14 welded and fixed to the clamp arm 3, the first stop 13 and the second stop 14 being located between the clamp teeth and the hinge point of the clamp arm 3 and the intermediate beam 2;

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

[0101] When the jaws of the clamp arm assembly close to the minimum angle, the second stop 14 on the clamp arm 3 abuts against the intermediate beam 2, preventing the jaws from closing further.

[0102] The maximum and minimum angles correspond to the limit positions of the jaws opening and closing of the clamp arm assembly. The first stop 13 and the second stop 14 prevent the jaws from opening too wide or too small, effectively preventing damage to the slab clamps.

[0103] Example 2

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

[0105] In this embodiment, as Figure 8 to Figure 10 As shown, the opening and closing device 5 includes a base 58 fixed on the intermediate beam 2 and two ear plates 51 symmetrically welded and fixed on the hanging beam 1. A limiting block 53 is provided between the two ear plates 51. The ear plates 51 are movably connected to the locking hook plate 54 through the first pin 52. The bottom of the locking hook plate 54 is provided with a T-shaped locking pin 55.

[0106] The base 58 has an upward opening, and a stop pin 510 and a triangular hook plate 59 with an inwardly recessed 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 57.

[0107] The J-shaped plate 56 can contact the tip 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 513 of the J-shaped plate can form a gap channel with the inner side of the triangular hook plate 59, allowing the T-shaped locking pin 55 to pass through from bottom to top.

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

[0110] In this embodiment, the structure of the opening and closing device 5, except for the pointer 515 and the dial 514, is the same as that of the "lifting device opening and closing device" in patent number CN101372307B. The specific working principle will not be described in detail here, but only the purpose of the newly added pointer 515 and dial 514 will be explained.

[0111] The dial 514 should have at least two scales corresponding to the locked and unlocked states of the opener / closer. The pointer 515 swings with the hook plate 54 and points to the corresponding scale. The operator of the bridge crane can judge the status of the opener / closer by observing the pointer 515.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A slab clamp comprising: The crane beam (1) and the middle beam (2) are provided with an opening and closing device (5) between the crane beam (1) and the middle beam (2), and two pincer arm groups are symmetrically arranged at the bottom of both ends of the crane beam (1), and the two pincer arm groups are connected through the middle beam (2). The crane beam (1) is provided with a lifting pulley block at both ends, the lifting pulley block comprises a first pulley (11) and a second pulley (12) which are symmetrically distributed on both sides of the vertical bisector plane of the crane beam (1), and the vertical bisector plane of the crane beam (1) is parallel to the length direction of the crane beam (1). The pincer arm group comprises two symmetrically intersecting pincer arms (3) and two symmetrically intersecting connecting rods (4), the middle part of the pincer arm (3) is hinged to the middle beam (2), one end of the pincer arm (3) is provided with a pincer tooth, the other end of the pincer 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 crane beam (1).

2. The slab clamp according to claim 1, characterized in that Further comprising an anti-swing structure (8) arranged between the crane beam (1) and the middle beam (2), the anti-swing structure (8) is used for restricting the movement of the middle beam (2) relative to the crane beam (1) in the width direction.

3. The slab clamp according to claim 2, characterized in that The anti-swing 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 crane beam (1); The axis of the hinge shaft of the middle beam (2), the first connecting rod (81) and the second connecting rod (82) and the crane beam (1) is parallel to the width direction of the middle beam (2); The two first connecting rods (81) are fixedly connected through a first connecting plate (83), and the two second connecting rods (82) are fixedly connected through a second connecting plate (84).

4. The slab clamp of claim 1, wherein, A plurality of lifting hooks (9) are arranged on the outer periphery of the crane beam (1).

5. The slab clamp according to claim 4, characterized in that A lifting hook stopper (6) is further arranged on the crane beam (1) and used for blocking the steel wire rope from being separated from the lifting hook (9), the lifting hook stopper (6) is hinged to the crane beam (1), and the lifting hook stopper (6) is located at the hook opening of the lifting hook (9); When the lifting hook stopper (6) bears an external force applied from the hook opening to the hook, the lifting hook stopper (6) swings relative to the crane beam (1), so that an opening allowing the steel wire rope to enter and exit is formed between the lifting hook (9) and the lifting hook stopper (6); When the lifting hook stopper (6) does not bear the external force applied from the hook opening to the hook, the lifting hook stopper (6) is reset under the action of gravity.

6. The slab clamp according to claim 4, characterized in that Further comprising a locking device (7), the locking device (7) comprises a fixed support (71), a rotating support (72) and a connecting rod (73); The fixed support (71) is fixed on the crane beam (1), the fixed support (71) is provided with a first pin hole, the rotating support (72) is 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; When the jaw of the jaw arm group is opened to the 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 5, characterized in that The hook stopper (6) comprises two symmetrical triangular plates (61), a baffle (62) is fixed between the two triangular plates (61), one corner of the triangular plate (61) is hinged to the suspension beam (1), and the baffle (62) is located at the other corner of the triangular plate (61). When the hook stopper (6) does not bear external force applied from the hook opening to the hook, the baffle (62) abuts against the hook tip of the hook (9).

8. The slab clamp of claim 1, wherein, The opening and closing device (5) comprises a base (58) fixed on the middle beam (2) and two symmetrical ear plates (51) fixed on the suspension beam (1), a limiting stopper (53) is arranged between the two ear plates (51), the ear plate (51) is movably connected with a hook plate (54) through a first pin shaft (52), and a T-shaped locking shaft pin (55) is arranged at the bottom of the hook plate (54). The base (58) is upwardly open, a baffle pin (510) and a triangular hook plate (59) with a concave bottom edge are fixed on the base (58), the baffle 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 be in contact with the top tip 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 gap channel allowing the T-shaped locking shaft pin (55) to pass from bottom to top with the inner side edge of the triangular hook plate (59). A pointer (515) fixed on the top of the hook plate (54) and a scale disc (514) fixed on the suspension beam (1) are further arranged, and the pointer (515) can swing to point to different scales on the scale disc (514) following the hook plate (54).

9. The slab clamp of claim 1, wherein, A trigger (10) is further arranged, the trigger (10) comprises a trigger roller (101) and a trigger lever (102), and a long hole (103) is arranged on the trigger lever (102). A guide hole allowing the trigger lever (102) to slide up and down is arranged on the middle beam (2), a limiting pin (104) is arranged in the long hole (103), and the limiting pin (104) is fixed on the middle beam (2). A limiting switch (15) is further arranged on the middle beam (2), the limiting switch (15) is located above the trigger lever (102), and the limiting switch (15) is electrically connected with a warning light. When the middle beam (2) is placed to the lowest limit, the top end of the trigger lever (102) triggers the limiting switch (15). When the middle beam (2) is away from the slab, the trigger lever (102) is reset under the action of gravity.

10. The slab clamp of claim 1, wherein, Also included are a first stop (13) and a second stop (14) fixed on the jaw arms (3), which are located between the jaw teeth and the hinge points of the jaw arms (3) and the middle beam (2); When the jaw opening of the jaw arm group is opened to the maximum angle, the first stop (13) on one of the jaw arms (3) abuts against the end of the other jaw arm (3) away from the jaw teeth, blocking the jaw opening from continuing to open; When the jaw opening of the jaw arm group is closed to the minimum angle, the second stop (14) on the jaw arms (3) abuts against the middle beam (2), blocking the jaw opening from continuing to close.

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