Large-tonnage buffering lifting hook

Abstract

The utility model discloses a large-tonnage buffering lifting hook which comprises a buffering mechanism, a lifting hook connecting mechanism and a lifting hook body, the buffering mechanism comprises a connecting frame assembly, a pressing frame assembly, a lever assembly, a connecting rod assembly, an ejector rod assembly, an elastic assembly and a guide assembly, and the pressing frame assembly, the lever assembly, the connecting rod assembly, the ejector rod assembly, the elastic assembly and the guide assembly are arranged in the connecting frame assembly. The pressing frame assembly is arranged in the connecting frame; the lever assemblies are respectively arranged on the left and right sides of the pressing frame assembly, the upper ends are contacted with the pressing frame assembly, and the middle parts are connected with the connecting frame assembly; the connecting rod assemblies are respectively arranged below the two lever assemblies, and the upper ends of the connecting rod assemblies are connected with the lever assemblies; one end of the ejector rod assembly is movably connected with the connecting rod assembly; the elastic assembly is arranged on the lower portion of the connecting frame assembly and connected with one ends of the two ejector rod assemblies. The guide assemblies make contact with the ejector rod assemblies correspondingly. The lifting hook connecting mechanism is connected with the pressing frame assembly; the lifting hook body is connected with the lower part of the connecting frame assembly. The shock absorption effect of the lifting hook can be effectively achieved, the requirement for large-tonnage lifting operation is met, and meanwhile cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tower crane hoist technology field especially, relate to a big tonnage buffer lifting hook. BACKGROUND

[0002] Tower crane hook is an important component of tower crane, mainly used for lifting various heavy and goods. At present, the domestic and foreign existing buffer type lifting hook lifting capacity is only about 5 tons, used for lifting brittle material. One of the development trends of hoisting machinery is super large lifting weight, but the large tonnage lifting hook generally does not have the buffering function, when the lifting weight is very large, if the lifting instantaneous acceleration is large, the hook head will produce a great impact force, if the hook head has material defects inside and leads to insufficient strength, the hook head may break, thereby the tower crane jib is impacted by the reverse hoisting load, which has a great risk of tower collapse accident.

[0003] Chinese utility model patent (publication number: CN207158611U) discloses a tower crane buffer hook, including hook connecting rod, the bottom end of the hook connecting rod is hinged with base hook, the upper side of the hook connecting rod is provided with upper cover plate, and the lower side is provided with lower base, the upper cover plate is fixedly connected with the lower base, a buffer seat is sleeved between the upper cover plate and the lower base, a cylindrical cavity is arranged in the center of the buffer seat, the cylindrical cavity outwardly extends horizontally and is provided with an abutment plate abutting against the upper cover plate, at least two groups of compression elastic members are sleeved on the hook connecting rod, the compression elastic members are located between the buffer seat and the lower base and between the cylindrical cavity and the hook connecting rod. The utility model provides a tower crane buffer hook with simple structure, strong applicability and stable buffering effect, which has good buffering effect when lifting relatively light building materials.

[0004] Chinese utility model patent (publication number: CN205676009U) discloses a buffer hook, which comprises an arc-shaped lifting ring, two ends of the lifting ring are fixed on a horizontally arranged cover plate through slotted nuts respectively, a spring lower seat is arranged in parallel below the cover plate, the cover plate is connected with the spring lower seat through four pull rod studs, a buffer unit is arranged between the cover plate and the spring lower seat, the buffer unit is connected with a hook connecting seat through the spring lower seat, and a hook is connected to the lower end of the hook connecting seat. The utility model discloses a buffer hook, which solves the problem of poor buffering effect of large lifting hook when lifting small weight.

[0005] The utility model discloses a crane hook device (CN211594778U) is disclosed, which includes a rotating device and a buffer hook device. The rotating device includes a pulley block, and the lower end of the pulley block is provided with a base for fixing the buffer hook device. The base is provided with a rolling bearing inside. The lower end of the base is fixedly connected with a fixed housing with a hollow inside. The fixed housing is installed with a positioning disc matched with the buffer hook device inside the hollow. The positioning disc is provided with a plurality of positioning holes. The positioning disc is also provided with a positioning shaft matched with the positioning holes. The buffer hook device includes a rotating rod connected with the rolling bearing inside the base. The lower end of the rotating rod is fixedly connected with a horizontally arranged cover plate. The cover plate is parallel to a spring lower seat arranged below the cover plate. The cover plate and the spring lower seat are provided with a buffer unit therebetween.

[0006] However, in the above technical solutions, vertical coaxial compression springs are used as damping elements. The disadvantage is that the force on the spring in the vertical direction is equal to the lifting weight. When the hoisting mass is large, the size of the spring is large, the structure size is large, the cost is high, the stiffness coefficient of the main load-bearing spring is large, the hook is subjected to a large impact force in a short time after lifting, and the damping effect is poor.

[0007] The invention patent (CN112027887A) discloses a flexible buffer crane hook, which includes a pulley block mechanism, a flexible buffer mechanism, and a hook mechanism. The pulley block mechanism, the flexible buffer mechanism, and the hook mechanism are arranged in order from top to bottom. The flexible buffer mechanism includes a flexible buffer beam, a main frame, two elastic members, and two parallel arranged rollers. The flexible buffer beam is built into the main frame. The two sides of the flexible buffer beam are symmetrically provided with arc load-bearing surfaces. Two rollers are slidingly connected with the main frame. The opposite sides of the two rollers are respectively tangent to the two arc load-bearing surfaces. The opposite sides of the two rollers are respectively connected with two elastic members. The two elastic members are fixed on the main frame. The technical problem of the prior art that the stress of the entire lifting system changes sharply when the hook lifts and unloads the goods, especially when the load is too large, is solved.

[0008] The technical solution uses a sliding block and a compression spring damping structure. The force on the spring in the horizontal direction is equal to half of the lifting weight, which can reduce the size of the spring and reduce the cost. However, since the sliding block is a sliding friction, when the hoisting mass is large, the friction force will be large, which may cause the sliding block to be stuck in the sliding groove, and the reliability is not high. The friction between the sliding block and the frame also reduces the service life of the element, which can only be applied to small-tonnage hooks.

[0009] Therefore, the prior art has the disadvantages of poor damping effect and high cost, which cannot meet the technical requirements of large-tonnage buffer hooks. Utility model content

[0010] The utility model discloses a large tonnage buffer lifting hook to solve the technical problem in the background art.

[0011] In order to realize above-mentioned purpose, the utility model adopts the following technical scheme:

[0012] A large tonnage buffer lifting hook, including buffer mechanism, hook connecting mechanism, hook body, the buffer mechanism includes connecting frame assembly and be located in the pressing frame assembly of connecting frame assembly, lever assembly, connecting rod assembly, jacking rod assembly, elastic component, guide component, the connecting frame assembly vertical arrangement, the pressing frame assembly is movably arranged in the upper side of the middle part of connecting frame, the lever assembly is equipped with two, respectively arranged in the left and right sides of pressing frame assembly, and its upper end is in contact with the pressing frame assembly, and the middle part is movably connected with the connecting frame assembly, the connecting rod assembly is equipped with two, and is arranged below two lever assemblies, and its upper end is movably connected with the lower end of lever assembly, the jacking rod assembly is horizontally provided with two, and one end of two jacking rod assemblies towards the vertical center line of connecting frame assembly is movably connected with the lower end of connecting rod assembly, the elastic component is equipped with two, and is arranged in the lower part of connecting frame assembly respectively, and is connected with one end of two jacking rod assemblies away from the vertical center line of connecting frame assembly respectively, the guide component is equipped with two with the jacking rod assembly, and the top surface and bottom surface of two jacking rod assemblies are in contact with guide component respectively, the hook connecting mechanism is vertically arranged, and its upper portion passes through the front and rear sidewalls of connecting frame assembly and is connected with the pressing frame assembly, and can move on the connecting frame assembly, the hook body is movably connected with the lower part of connecting frame assembly.

[0013] Further, the connecting frame assembly includes a frame plate, the frame plate is arranged in two, and the two frame plates are fixedly connected on opposite sides, and a cavity is formed between the two frame plates, the pressing frame assembly includes a support plate, an inclined pressing plate and a pressing frame rib plate, the support plate is arranged in a Y-shaped structure vertically, and two support plates are arranged in two, and the two support plates are fixedly connected on opposite sides through the pressing frame rib plate, and the inclined pressing plate is arranged on the inclined surfaces on the left and right sides of the upper portions of the two support plates.

[0014] Further, a groove is arranged in the middle of the top surface of the frame plate, the top portion of the support plate is higher than the groove bottom surface, and a limiting plate is further arranged, the limiting plate is horizontally arranged on the top surface of the support plate, and the limiting plate extends out of the groove of the support plate at the front and rear ends.

[0015] Further, it further comprises a first moving bearing, a bearing plate, a second moving bearing, the support plate is connected with the first moving bearing through a pin shaft on the upper part of the opposite side of the left and right sides, the bearing plate is vertically arranged on the opposite side of the two support plates, and the bearing plate on each support plate is arranged at intervals on the left and right sides, and the second moving bearing is connected between the two bearing plates through a pin shaft, and the second moving bearing is in contact with the opposite side of the frame plate.

[0016] Further, it further comprises an upper baffle and a lower baffle, the upper baffle and the lower baffle are arranged between the two frame plates, the upper baffle is vertically arranged on the left and right sides of the upper part of the pressing frame assembly, the front and back sides of the upper baffle are fixedly connected with the opposite side of the two frame plates, and the opposite side of the two upper baffles is in contact with the first moving bearing, the lower baffle is vertically arranged on the left and right sides of the lower part of the pressing frame assembly, the front and back sides of the lower baffle are fixedly connected with the opposite side of the two frame plates, and the opposite side of the two lower baffles is in contact with the second moving bearing.

[0017] Further, the lever assembly comprises a lever plate, a lever rib and a lever bearing, the lever plate is arranged at intervals on the front and back sides, the opposite side of the two lever plates is fixedly connected through the lever rib, the upper part of the opposite side of the two lever plates is connected with the lever bearing through a pin shaft, and the middle part is movably connected with the two frame plates through a pin shaft, and the lever bearings of the two lever assemblies are in contact with the inclined pressing plate.

[0018] Further, the connecting rod assembly comprises a connecting rod, and the upper part of the connecting rod is rotatably connected with the two lever plates away from the inclined pressing plate.

[0019] Further, the top rod assembly comprises a side plate, a pad plate, a top rod, a spring positioning block and a top rod bearing, the side plate is horizontally arranged and arranged at intervals on the front and back sides, the bottom of the opposite side of the two side plates is an inclined surface inclined to the two side plates, and the upper part of the opposite side of the two side plates away from the vertical center line direction of the frame plate is connected with the top rod bearing through a pin shaft, the pad plate is arranged on the opposite side of the side plate, the top rod is horizontally arranged between the pad plates and fixedly connected with the pad plates, one end of the top rod away from the vertical center line direction of the frame plate extends out of the side plate and is rotatably connected with the lower part of the connecting rod, and the spring positioning block is horizontally arranged on the side of the two side plates away from the vertical center line direction of the frame plate.

[0020] Further, the elastic assembly comprises a spring fixing seat and a compression spring, the spring fixing seat is arranged on the left and right sides of the lower part between the two frame plates corresponding to the spring positioning block of the top rod assembly, and is fixedly connected with the frame plate, and one end of the spring fixing seat is open, and the compression spring is horizontally arranged, one end of the compression spring is connected with the spring positioning block, and the other end is connected with the spring fixing seat.

[0021] Further, the guide assembly comprises a guide groove, a guide bearing and a guide limiting plate; the guide groove is horizontally arranged at the lower left and right sides of each rack plate on the opposite side and below the top rod assembly, the guide grooves below the left and right sides of the two rack plates are correspondingly arranged, and the guide grooves are arranged at a certain angle with the vertical plane of the rack plate and are inclined, the top surface of the guide groove is open, the guide bearing is connected to the front and rear sides of the guide groove through a pin shaft, the top surface of the guide bearing extends out of the top surface of the guide groove and is in contact with the inclined surface of the lower part of the side plate; the guide limiting plate is horizontally arranged above the top rod assembly and is in contact with the top rod bearing at the bottom surface.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] 1、The buffer mechanism of the utility model, through setting up the pressure frame assembly, lever assembly, connecting rod assembly, top rod assembly, elastic assembly, stroke two-stage force reduction mechanism, gradually disperses and transmits the huge impact force borne by the lifting hook to the compression spring of the elastic assembly, according to the lever principle and the specific structure and connection relation of each component, the effective reduction of spring stress is realized, the maximum stress is only 1 / 15-1 / 20 of the maximum lifting capacity, compared with the traditional coaxial type compression spring mode without force reduction, the spring stiffness coefficient is significantly reduced, the damping effect is greatly improved, large-tonnage lifting operation can be met, the risk of the lifting hook head breaking due to strong impact during large-tonnage lifting operation is avoided, the reverse impact on the crane boom is effectively reduced, and the tower collapse accident is greatly reduced.

[0024] 2The two-stage force reduction mechanism formed by the buffer mechanism of the utility model greatly reduces the load borne by the spring in the entire buffer system, so that a compression spring with smaller specification and lower cost can be selected, and the reduction of the size of the compression spring also optimizes the space occupation of the entire buffer mechanism, further reducing the material cost and manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structure schematic diagram of the utility model;

[0026] Figure 2 It is the sectional view of the utility model under no-load condition;

[0027] Figure 3 It is the sectional view of the utility model under full-load condition;

[0028] Figure 4 It is the structure schematic diagram of the connecting frame assembly of the utility model;

[0029] Figure 5 It is the sectional view of the connecting frame assembly of the utility model;

[0030] Figure 6It is the internal structure schematic view of the connecting frame assembly of the utility model;

[0031] Figure 7 It is the structure schematic view of the pressing frame assembly of the utility model;

[0032] Figure 8 It is the sectional view of the pressing frame assembly of the utility model;

[0033] Figure 9 It is the structure schematic view of the lever assembly of the utility model;

[0034] Figure 10 It is the structure schematic view of the connecting rod assembly of the utility model;

[0035] Figure 11 It is the structure schematic view of the ejector rod assembly of the utility model;

[0036] Figure 12 It is the front view of the ejector rod assembly of the utility model;

[0037] Figure 13 It is the structure schematic view of the utility model Figure 2 The enlarged view of A place in the utility model

[0038] In the drawing, 1-buffer mechanism;

[0039] 11-connecting frame assembly; 111-frame body plate; 1111-groove; 1112-channel; 1113-mounting hole; 1114-through hole; 1115-connecting bearing; 112-upper baffle; 113-lower baffle;

[0040] 12-pressing frame assembly; 121-support plate; 1211-connecting hole; 122-inclined pressing plate; 123-pressing frame rib plate; 124-limiting plate; 125-one moving bearing; 126-bearing plate; 127-second moving bearing;

[0041] 13-lever assembly; 131-lever plate; 1311-first movable hole; 1312-second movable hole; 1313-third movable hole; 132-lever rib; 133-lever bearing;

[0042] 14-connecting rod assembly; 141-connecting rod piece; 1411-fourth movable hole; 1412-fifth movable hole; 142-connecting rod bearing;

[0043] 15-ejector rod assembly; 151-side plate; 152-pad plate; 153-ejector rod; 1531-sixth movable hole; 154-spring positioning block; 155-ejector rod bearing;

[0044] 16-elastic assembly; 161-spring fixing seat; 162-compression spring;

[0045] 17 - guide assembly; 171 - guide groove; 172 - guide bearing; 173 - guide limit plate;

[0046] 2 - hook connecting mechanism; 21 - connecting plate; 211 - round hole; 22 - hook nut; 23 - thrust bearing; 24 - hook cross beam;

[0047] 3 - hook body; 31 - anti-off frame; 4 - small hook frame; 5 - large hook frame; 6 - pulley assembly. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following preferred embodiments are given with reference to the drawings, and the utility model is further explained in detail. However, it should be noted that many details listed in the specification are only for the reader to have a thorough understanding of one or more aspects of the utility model, and the aspects of the utility model can be realized even without these specific details.

[0049] As Figures 1-13As shown, a large tonnage buffer hook, including buffer mechanism 1, hook connecting mechanism 2, hook body 3, the buffer mechanism 1 includes connecting frame assembly 11 and the pressure frame assembly 12 arranged in connecting frame assembly 11, lever assembly 13, connecting rod assembly 14, top rod assembly 15, elastic assembly 16, guide assembly 17, the connecting frame assembly 11 is vertically arranged; The pressure frame assembly 12 is movably arranged on the upper side of the middle part of the connecting frame assembly 11; The lever assembly 13 is provided with two, which are respectively arranged on the left and right sides of the pressure frame assembly 12, the upper end thereof is in contact with the pressure frame assembly 12, and the middle part is movably connected with the connecting frame assembly 11; The connecting rod assembly 14 is provided with two, which are respectively arranged below the two lever assemblies 13, and the upper end thereof is movably connected with the lower end of the lever assembly 13; The top rod assembly 15 is horizontally provided with two, one end of the two top rod assemblies 15 towards the vertical center line of the connecting frame assembly 11 is movably connected with the lower end of the connecting rod assembly 14; The elastic assembly 16 is provided with two, which are respectively arranged at the lower part of the connecting frame assembly 11 and are respectively connected with one end of the two top rod assemblies 15 away from the vertical center line of the connecting frame assembly 11; The guide assembly 17 is arranged below the top rod assembly 15, and the top surface thereof is in contact with the bottom surface of the top rod assembly 15; The hook connecting mechanism 2 is vertically arranged, the upper part thereof passes through the front and rear sidewalls of the connecting frame assembly 11 and is connected with the pressure frame assembly 12, and can move on the connecting frame assembly 11; The hook body 3 is movably connected with the lower part of the connecting frame assembly 11, and the hook body 3 is provided with an anti-disengagement frame 31. When the hook is fully loaded, the hook and the hook connecting mechanism 2 move downward, driving the pressure frame assembly 12 to move downward in the connecting frame assembly 11, when the pressure frame assembly 12 moves, the lever assembly 13 is pressed downward, the lever assembly 13 rotates based on the connecting point with the connecting frame assembly 11, so that the lower end of the lever assembly 13 rotates upward, pulling the connecting rod assembly 14 to move upward, when the connecting rod assembly 14 moves upward, the lower end pushes the top rod assembly 15 into the elastic assembly 16; When the hook is unloaded, the elastic assembly 16 pushes the top rod assembly 15 to move in the direction of the vertical center line of the frame body plate 111, in the moving process, the top rod assembly 15 pushes the lower end of the connecting rod assembly 14, so that the upper end of the connecting rod assembly 14 pulls the lever assembly 13 downward, the lever assembly 13 rotates based on the connecting point with the connecting frame assembly 11, so that the upper end pushes the pressure frame assembly 12 upward, and the pressure frame assembly 12 moves upward to reset.

[0050] As Figures 1-6As shown, the connecting frame assembly 11 comprises a frame plate 111; the frame plate 111 is provided with two frame plates 111 spaced apart front and back, and the opposite sides of the two frame plates 111 are fixedly connected, and a cavity is formed between the two frame plates 111; a front and back through channel 1112 is formed in the middle of the frame plate 111, mounting holes 1113 are formed in the upper left and right sides, and front and back through holes 1114 are formed in the left and right sides of the channel 1112; the mounting hole 1113 on the left side of the frame plate 111 is used to connect the small hook frame 4, and the mounting hole 1113 on the right side is used to connect the large hook frame 5; the small hook frame 4 and the large hook frame 5 are internally provided with a pulley assembly 6 for winding the lifting rope; the through hole 1114 is internally provided with a connecting bearing 1115 for connecting the lever assembly 13.

[0051] As shown in Figures 7-8 The pressing frame assembly 12 comprises a support plate 121, an inclined pressing plate 122, and a pressing frame rib plate 123; the support plate 121 is vertically arranged in a Y-shaped structure, and two support plates 121 are spaced apart front and back; the opposite sides of the two support plates 121 are fixedly connected by the pressing frame rib plate 123; a front and back through connecting hole 1211 is formed in the lower part of the support plate 121, and the position of the connecting hole 1211 corresponds to the position of the channel 1112 of the frame plate 111; a pin shaft is passed through the connecting hole 1211 of the support plate 121 and the channel 1112 of the frame plate 111 to connect the hook connecting mechanism 2 with the support plate 121; the hook connecting mechanism 2 can move along the channel 1112; when fully loaded, the hook body 3 drives the hook connecting mechanism to move downward in the channel 1112, so that the pressing frame assembly 12 moves downward in the frame plate 111; the inclined pressing plate 122 is arranged on the inclined surface on the left and right sides of the upper part of the two support plates 121; when the pressing frame assembly 12 moves downward, the inclined pressing plate 122 moves downward to press the lever assembly 13.

[0052] As shown in Figures 1-8 The top surface of the frame plate 111 is provided with a groove 1111; the top of the support plate 121 is higher than the groove bottom surface of the groove 1111; further comprising a limiting plate 124; the limiting plate 124 is horizontally arranged on the top surface of the support plate 121, and the front and back ends of the limiting plate 124 extend out of the groove 1111 of the frame plate 111. When unloaded, the limiting plate 124 is at a certain distance from the groove bottom surface of the groove 1111; when fully loaded, the limiting plate 124 moves downward and is clamped on the groove 1111; the limiting plate 124 is used to prevent the compression spring 162 of the elastic assembly 16 from failing, and to prevent the hook body 3 from suddenly falling and causing a safety accident.

[0053] As shown in Figures 7-8As shown, the support plate 121 is provided with a first movable bearing 125, a bearing plate 126 and a second movable bearing 127. The left and right sides of the upper and lower parts of the opposite side of the support plate 121 are connected with the first movable bearing 125 through a pin shaft, and the inner ring of the first movable bearing 125 is fixedly sleeved on the pin shaft. The bearing plate 126 is vertically arranged on the opposite side of the two support plates 121, and the bearing plate 126 on each support plate 121 is arranged in two parts with a left and right interval. The second movable bearing 127 is connected between the two bearing plates 126 through a pin shaft, and the inner ring of the second movable bearing 127 is fixedly sleeved on the pin shaft. The second movable bearing 127 is in contact with the opposite side of the frame plate 111. When the pressing frame assembly 12 moves, the second movable bearing 127 can slide on the frame plate 111, so as to ensure the stability and smoothness of the movement of the pressing frame assembly 12.

[0054] As shown in the drawings, Figures 2-6 The upper baffle 112 and the lower baffle 113 are arranged between the two frame plates 111. The upper baffle 112 is vertically arranged in two parts and located on the left and right sides of the upper part of the pressing frame assembly 12. The front and rear sides of the two upper baffles 112 are fixedly connected with the opposite side of the two frame plates 111, and the opposite side of the two upper baffles 112 is in contact with the first movable bearing 125. The lower baffle 113 is vertically arranged in two parts and located on the left and right sides of the lower part of the pressing frame assembly 12. The front and rear sides of the two lower baffles 113 are fixedly connected with the opposite side of the two frame plates 111, and the opposite side of the two lower baffles 113 is in contact with the second movable bearing 127. When the pressing frame assembly 12 moves, the first movable bearing 125 on the upper part of the support plate 121 can move on the upper baffle 112, the second movable bearing 127 on the lower part can move on the lower baffle 113, and the second movable bearing 127 on the front and rear sides can move on the frame plate 111, so as to further ensure the stability of the movement of the pressing frame assembly 12 and prevent the deviation. At the same time, the upper baffle 112 and the lower baffle 113 are used to connect the frame plates 111 with each other.

[0055] As shown in the drawings, Figure 9As shown, the lever assembly 13 includes a lever plate 131, a lever rib 132, and a lever bearing 133. Two lever plates 131 are arranged at intervals in front and back, and the opposite sides of the two lever plates 131 are fixedly connected by the lever rib 132. The first movable hole 1311, the second movable hole 1312, and the third movable hole 1313 are arranged at intervals on the two lever plates 131. The first movable hole 1311 on the upper part of the opposite side of the lever plate 131 is connected with the lever bearing 133 through a pin shaft. The inner ring of the lever bearing 133 is fixedly sleeved on the pin shaft. The second movable hole 1312 in the middle part is connected with the connecting bearing 1115 in the through hole 1114 of the two frame plate 111 through a pin shaft, so that the lever plate 131 can rotate based on the pin shaft through the second movable hole 1312. The lever bearings 133 of the two lever assemblies 13 are in contact with the inclined pressing plate 122. When fully loaded, the inclined pressing plate 122 presses the lever bearing 133 downward when the pressing frame assembly 12 moves downward, so that the lever plate 131 rotates. When unloaded, the lever plate 131 rotates, so that the lever bearing 133 pushes the pressing frame assembly 12 upward to reset.

[0056] In further embodiments, the lever plate force arm ratio is set to 1.5-2. At this force arm ratio, the lever plate 131 can effectively transmit the force transmitted by the pressing frame assembly 12 to the connecting rod assembly 14, so that the connecting rod assembly 14 obtains appropriate tension, so that the compression spring 162 of the elastic assembly 16 can be more reasonably compressed, and the buffering effect of the entire buffering mechanism is optimized.

[0057] As shown in Figure 10 The connecting rod assembly 14 includes a connecting rod 141. The fourth movable hole 1411 is arranged on the upper part of the connecting rod 141, and the fifth movable hole 1412 is arranged on the lower part of the connecting rod 141. The connecting rod bearing 142 is arranged in the fourth movable hole 1411 and the fifth movable hole 1412. The connecting rod bearing 142 in the fourth movable hole 1411 on the upper part of the connecting rod 141 is rotatably connected with the third movable hole 1313 at the end of the two lever plates 131 away from the inclined pressing plate 122 through a pin shaft. When fully loaded, the lower end of the lever plate 131 pulls the upper end of the connecting rod 141 upward, so that the lower end of the connecting rod 141 pushes the top rod assembly 15 to move away from the vertical center line of the frame plate 11. When unloaded, the top rod assembly 15 moves to the vertical center line of the frame plate 11, pushes the lower end of the connecting rod 141, and pulls the lower end of the lever plate 131 downward, so that the upper end of the lever plate 131 rotates upward, and the lever bearing 133 pushes the pressing frame assembly 12 to reset upward.

[0058] As shown in Figure 3As shown, the connecting rod 141 is designed to have an angle of 5° between the connecting rod 141 and the vertical plane when fully loaded, which can optimize the force transmission path. When the lever assembly 13 rotates due to the downward pressure of the pressing frame assembly 12, the angle helps to more reasonably decompose the force to the direction of moving the push rod assembly 15. In this way, the force transmitted to the push rod assembly 15 can act in the expected direction and size, so that the push rod assembly 15 exerts a suitable pressure on the compression spring 162 of the elastic assembly 16, and finally the maximum stress of the compression spring 162 is only 1 / 15-1 / 20 of the maximum lifting capacity, effectively reducing the burden of the compression spring 162.

[0059] As shown in Figures 11-12 , the push rod assembly 15 includes side plates 151, backing plates 152, push rods 153, spring positioning blocks 154, and push rod bearings 155. The side plates 151 are horizontally arranged and spaced apart front and back. The opposite bottom of the two side plates 151 is a 45° chamfered inclined surface inclined to the space between the two side plates 151. The opposite side of the upper part of the two side plates 151 away from the vertical center line of the frame plate 111 is connected to the push rod bearing 155 through a pin shaft. The inner ring of the push rod bearing 155 is fixedly connected with the pin shaft, and the bottom of the side plate 151 is chamfered at 45°. The backing plate 152 is arranged on the opposite side of the side plate 151. The top of the side plate 151 and the backing plate 152 near the vertical center line of the frame plate 111 is chamfered to avoid the connecting rod assembly 14 and prevent movement interference. The push rod 153 is horizontally arranged between the backing plates 152 and fixedly connected with the backing plates 152. The end of the push rod 153 towards the vertical center line of the frame plate 111 extends out of the side plate 151 and is provided with a sixth movable hole 1531. The sixth movable hole 1531 of the push rod 153 is rotatably connected with the connecting rod bearing 142 in the fifth movable hole 1412 of the connecting rod 141 through a pin shaft. The spring positioning block 154 is horizontally arranged on the side of the two side plates 151 away from the vertical center line of the frame plate 111.

[0060] As shown in Figures 2-3 , 5-6, the elastic assembly 16 includes a spring fixing seat 161 and a compression spring 162. The spring fixing seat 161 is provided with two, respectively corresponding to the spring positioning block 154 of the push rod assembly 15 and arranged on the left and right sides of the lower part between the two frame plates 111, and the end thereof towards the spring positioning block 154 is open. The compression spring 162 is horizontally arranged, one end of which is connected with the spring positioning block 154, and the other end is connected with the spring fixing seat 161. Under full load, the push rod assembly 15 moves away from the vertical center line of the frame plate 111, and the spring positioning block 154 compresses the compression spring 162. Under no load, the compression spring 162 pushes the push rod assembly 15 to reset the pressing frame assembly 12.

[0061] AsFigures 2-3 As shown in Figures 5-6, the guide assembly 17 includes a guide groove 171, a guide bearing 172, and a guide limiting plate 173. The guide groove 171 is horizontally arranged on the lower left and right sides of the opposite side of each frame plate 111, and is located below the top rod assembly 15. The guide grooves 171 on the lower left and right sides of the two frame plates 111 are correspondingly arranged, and the guide grooves 171 are set at a 45° angle with the frame plates 111, so that the guide bearing 172 can contact the chamfered surface of the lower part of the side plate 151. The top surface of the guide groove 171 is open, and the guide bearing 172 is connected to the front and rear sides of the inside by a pin. The inner ring of the guide bearing 172 is fixedly sleeved on the pin. The top surface of the guide bearing 172 extends out of the top surface of the guide groove 171 and contacts the chamfered bottom surface of the side plate 151 of the top rod assembly 15. The guide limiting plate 173 is horizontally arranged above the top rod assembly 15, and its bottom surface contacts the top rod bearing 155. When the top rod assembly 15 moves, the top rod bearing 155 can move on the bottom surface of the limiting plate 124 to ensure the stability of the movement of the connecting rod assembly 14. At the same time, the guide limiting plate 173 connects the two frame plates 111 to each other. The guide bearing 172 and the guide limiting plate 173 restrict the movement of the top rod assembly 15. The inclined guide groove 171 and the guide bearing 172 can restrict the top rod assembly 15 from moving downwards and forwards and backwards, and the guide limiting plate 173 restricts the top rod assembly 15 from moving upwards. Thus, the top rod assembly 15 can only move in the horizontal direction. At the same time, the top rod bearing 155 moves on the bottom of the limiting plate 124, and the bottom of the side plate 151 moves on the guide bearing 172 to ensure the stability of the movement of the top rod assembly 15.

[0062] like Figure 13 As shown, the hook connecting mechanism 2 includes a connecting plate 21, a hook nut 22, a thrust bearing 23, and a hook beam 24. The connecting plates 21 are vertically arranged, with two plates spaced apart. The upper and lower parts of the connecting plates 21 have circular holes 211. The opposite sides of the two connecting plates 21 are located on opposite sides of the two frame plates 111, and the circular holes 211 on the upper parts of the connecting plates 21 correspond to the channels 1112 on the frame plates 111. A pin passes through the channel 1112, the circular holes 211 on the upper parts of the connecting plates 21, and the connecting holes 1211 on the support plate 121, thus connecting the connecting plates 21... The frame plate 111 and the support plate 121 of the pressure frame assembly 12 are rotatably connected; the hook beam 24 is horizontally arranged on one side opposite to the two connecting plates 21, and round rods are provided on the front and rear sides of the hook beam 24. The hook beam 24 is rotatably connected to the round rods and the round holes 211 at the bottom of the connecting plate 21; the thrust bearing 23 is horizontally arranged, and its outer ring is fixedly arranged in the middle of the hook beam 24; the upper part of the hook body 3 is provided with threads, and the upper part of the hook body 3 passes upward through the inner ring of the thrust bearing 23 and is screwed into the upper part of the hook body 3 through the hook nut 22, so that the hook body 3 is installed on the hook beam 24.

[0063] The working mode of the utility model is:

[0064] When the hook is in full load state, i.e. when the hook starts to lift the heavy object, the hook body 3 generates downward tension due to the gravity of the heavy object, and the tension is transmitted to the press frame assembly 12 through the hook connecting mechanism 2. After the press frame assembly 12 is stressed, it moves stably downward along the channel 1112 on the frame plate 111 of the connecting frame assembly 11. In the moving process, the inclined press plate 122 of the press frame assembly 12 exerts downward pressure on the lever bearing 133 at the upper end of the lever assembly 13. The lever plate 131 of the lever assembly 13 rotates around the connecting point with the frame plate 111, and the lower end of the lever plate 131 is lifted upward, thereby pulling the upper end of the connecting rod piece 141 of the connecting rod assembly 14 through the connecting rod bearing 142, making the connecting rod piece 141 rotate, and further pushing the top rod 153 of the top rod assembly 15 through the lower end of the connecting rod piece 141. Under the pushing of the connecting rod piece 141, the top rod assembly 15 moves horizontally away from the vertical center line of the frame plate 111 under the cooperative constraint of the limiting plate 124, the top rod bearing 155 and the guide bearing 172. The spring positioning block 154 of the top rod assembly 15 exerts pressure on the compression spring 162 of the elastic assembly 16 in the moving process, so that the compression spring 162 is gradually compressed, thereby converting the impact force generated by the hook lifting the heavy object into the elastic potential energy of the spring and storing it, effectively buffering the impact force on the hook, ensuring the stability and safety of the whole lifting process, and avoiding safety accidents such as breakage of the hook head or damage of the crane boom caused by excessive impact force.

[0065] When the hook is in the empty state, the compression spring 162 in the elastic assembly 16 exerts an outward pushing force on the spring positioning block 154 of the top rod assembly 15 by virtue of its own elastic restoring force. Under the action of the pushing force, the side plate 151 of the top rod assembly 15 is rolled along the guide bearing 172 of the guide assembly 17, and can only stably move along the vertical center line direction of the frame plate 111 in the horizontal direction under the limitation of the guide limiting plate 173. At this time, the top rod 153 of the top rod assembly 15 pushes the lower end of the connecting rod 141 of the connecting rod assembly 14 through the connecting rod bearing 142, so that the connecting rod 141 rotates around the connecting point with the lever assembly 13, thereby generating a downward pulling force on the lower end of the lever plate 131 of the lever assembly 13. The lever plate 131 rotates around the connecting point with the through hole 1114 of the frame plate 111, and the lever bearing 133 at the upper end of the lever plate 131 pushes the inclined pressing plate 122 of the pressing frame assembly 12 upward. During the movement of the pressing frame assembly 12, the first moving bearing 125 on the support plate 121 stably rolls on the upper stop plate 112, and the second moving bearing 127 rolls on the lower stop plate 113 and the frame plate 111, which ensures that the pressing frame assembly 12 can stably move upward along the predetermined track, thereby driving the hook connecting mechanism 2 and the hook body 3 connected therewith to move upward synchronously, so that the entire hook system returns to the initial empty position and waits for the next hoisting task.

[0066] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A large tonnage cushioned hook comprising a cushioning mechanism, a hook connecting mechanism, a hook body, characterized in that: The buffering mechanism comprises a connecting frame assembly, a pressing frame assembly, a lever assembly, a connecting rod assembly, a top rod assembly, an elastic assembly and a guide assembly, the connecting frame assembly is vertically arranged, the pressing frame assembly is movably arranged on the upper side of the middle part of the connecting frame, the lever assembly is provided with two levers, which are arranged on the left and right sides of the pressing frame assembly, the upper end of each lever is in contact with the pressing frame assembly, and the middle part of each lever is movably connected with the connecting frame assembly, the connecting rod assembly is provided with two connecting rods, which are arranged below the two levers, the upper end of each connecting rod is movably connected with the lower end of the lever, the top rod assembly is horizontally provided with two top rods, one end of each top rod, which faces the vertical center line of the connecting frame assembly, is movably connected with the lower end of the connecting rod, the elastic assembly is provided with two elastic components, which are arranged on the lower part of the connecting frame assembly and are connected with the end of the top rod, which is away from the vertical center line of the connecting frame assembly, the guide assembly is provided with two guides, which are arranged on the top surface and the bottom surface of the top rod, and the hook connecting mechanism is vertically arranged, the upper part of the hook connecting mechanism penetrates through the front and rear sidewalls of the connecting frame assembly and is connected with the pressing frame assembly, and the hook connecting mechanism can move on the connecting frame assembly, and the hook body is movably connected with the lower part of the connecting frame assembly.

2. A large tonnage cushioned hook according to claim 1, characterized in that: The connecting frame assembly comprises a frame plate, the frame plate is vertically arranged, the frame plate is provided with two frame bodies, which are arranged at intervals, the two frame bodies are fixedly connected with each other, and a cavity is formed between the two frame bodies, the pressing frame assembly comprises a support plate, an inclined pressing plate and a pressing rib plate, the support plate is vertically arranged in a Y-shaped structure, the support plate is provided with two support plates, which are arranged at intervals, the opposite sides of the two support plates are fixedly connected with each other through the pressing rib plate, and the inclined pressing plate is arranged on the inclined surface on the left and right sides of the upper part of the two support plates.

3. A large tonnage cushioned hook according to claim 2, characterized in that: The top surface of the frame plate is provided with a groove, the top of the support plate is higher than the groove bottom surface, the limiting plate is horizontally arranged on the top surface of the support plate, and the front and rear ends of the limiting plate extend out of the groove of the support plate.

4. A large tonnage cushioned hook according to claim 3, wherein: The first moving bearing, the bearing plate and the second moving bearing are further arranged, the opposite sides of the support plate are provided with the first moving bearing, which is arranged on the upper left and right sides, the bearing plate is vertically arranged on the opposite side of the two support plates, the bearing plate is provided with two bearing plates, which are arranged at intervals on the left and right sides of each support plate, the second moving bearing is arranged between the two bearing plates through a pin shaft, and the second moving bearing is in contact with the opposite side of the frame plate.

5. A large tonnage cushioned hook according to claim 4, wherein: The upper baffle and the lower baffle are further arranged, the upper baffle and the lower baffle are arranged between the two frame bodies, the upper baffle is vertically arranged on the left and right sides of the upper part of the pressing frame assembly, the front and rear sides of the upper baffle are fixedly connected with the opposite sides of the two frame bodies, the opposite sides of the two upper baffles are in contact with the first moving bearing, the lower baffle is vertically arranged on the left and right sides of the lower part of the pressing frame assembly, the front and rear sides of the lower baffle are fixedly connected with the opposite sides of the two frame bodies, and the opposite sides of the two lower baffles are in contact with the second moving bearing.

6. A large tonnage cushioned hook as claimed in claim 3, wherein: The lever assembly comprises a lever plate, a lever rib and a lever bearing; two lever plates are arranged at intervals in front and back, and the opposite sides of the two lever plates are fixedly connected through the lever rib; the upper part of the opposite side of the two lever plates is connected with the lever bearing through a pin shaft, and the middle part is movably connected with the two frame body plates through a pin shaft; the lever bearings of the two lever assemblies are in contact with the inclined pressing plate.

7. A large tonnage cushioned hook according to claim 6, wherein: The connecting rod assembly comprises a connecting rod; the upper part of the connecting rod is rotatably connected with the two lever plates away from the inclined pressing plate.

8. A large tonnage cushioned hook according to claim 7, characterized in that: The ejector rod assembly comprises a side plate, a backing plate, an ejector rod, a spring positioning block and an ejector rod bearing; the side plate is horizontally arranged and arranged at intervals in front and back; the bottom of the opposite side of the two side plates is an inclined surface inclined to the two side plates; the upper part of the opposite side of the two side plates away from the vertical center line of the frame body plate is connected with the ejector rod bearing through a pin shaft; the backing plate is arranged on the opposite side of the side plate; the ejector rod is horizontally arranged between the backing plates and fixedly connected with the backing plates; the end of the ejector rod towards the vertical center line of the frame body plate extends out of the side plate and is rotatably connected with the lower part of the connecting rod; the spring positioning block is horizontally arranged on the side of the two side plates away from the vertical center line of the frame body plate.

9. A large tonnage cushioned hook according to claim 8, wherein: The elastic assembly comprises a spring fixing seat and a compression spring; the spring fixing seat is arranged on the left and right sides of the lower part between the two frame body plates corresponding to the spring positioning block of the ejector rod assembly, and is fixedly connected with the frame body plate; the end of the spring fixing seat towards the spring positioning block is open; the compression spring is horizontally arranged, and one end of the compression spring is connected with the spring positioning block, and the other end of the compression spring is connected with the spring fixing seat.

10. A large tonnage cushioned hook as claimed in claim 8, wherein: The guide assembly comprises a guide groove, a guide bearing and a guide limiting plate; the guide groove is horizontally arranged on the left and right sides of the lower part of the opposite side of each frame body plate and below the ejector rod assembly; the guide grooves on the left and right sides below the two frame body plates are correspondingly arranged, and the guide grooves are inclinedly arranged at a certain angle with the vertical surface of the frame body plate; the top surface of the guide groove is open, and the guide bearing is connected with the guide groove through a pin shaft; the top surface of the guide bearing extends out of the top surface of the guide groove and is in contact with the inclined surface of the lower part of the side plate; the guide limiting plate is horizontally arranged above the ejector rod assembly, and the bottom surface of the guide limiting plate is in contact with the ejector rod bearing.

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