Large-tonnage buffering lifting device

Abstract

The large-tonnage buffering lifting device 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 guiding assembly, and the pressing frame assembly, the lever assembly, the connecting rod assembly, the ejector rod assembly, the elastic assembly and the guiding 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 damping effect of the lifting hook can be effectively achieved, large-tonnage lifting operation is met, and meanwhile cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of tower crane hoisting equipment, and in particular relates to a large-tonnage buffer hoisting device. Background Art

[0002] The tower crane hook is an important part of the tower crane, mainly used to lift various heavy objects and cargoes. At present, the existing buffer hooks at home and abroad have a lifting capacity of only about 5 tons, which are used to lift brittle materials. One of the development trends of lifting machinery is super-large lifting weight, but large-tonnage lifting hooks generally do not have a buffering function. When the lifting weight is large, if the lifting instantaneous acceleration is large, the hook head will generate a large impact force. If there are material defects inside the hook head that lead to insufficient strength, it may cause the hook head to break, so that the crane boom receives the impact of the reverse lifting load, causing a high risk of tower collapse accidents.

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

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

[0005] A Chinese utility model patent (publication number: CN211594778U) discloses a hook device for a crane, comprising a rotating device and a buffering hook device; wherein the rotating device comprises a pulley block, a base for fixing the buffering hook device is arranged at the lower end of the pulley block, and a rolling bearing is arranged in the base; a fixed shell with a cavity inside is fixedly connected to the lower end of the base, a positioning plate cooperating with the buffering hook device is installed inside the cavity of the fixed shell, a plurality of positioning holes are arranged on the positioning plate, and a positioning shaft cooperating with the positioning holes is also arranged on the positioning plate; and the buffering hook device comprises a rotating rod connected to the rolling bearing in the base, a horizontally arranged cover plate is fixedly connected to the lower end of the rotating rod, a spring lower seat is arranged in parallel directly below the cover plate, and a buffer unit is arranged between the cover plate and the spring lower seat.

[0006] However, in the above technical solutions, vertical coaxial compression springs are used as shock-absorbing element structures. The disadvantage is that the force applied to the spring in the vertical direction is equal to the lifting weight. When the lifting weight is large, the corresponding spring specifications are large, the structural dimensions are large, the cost is high, and 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 shock-absorbing effect is not good.

[0007] The Chinese invention patent (publication number: CN112027887A) discloses a flexible buffer crane hook, comprising a pulley block mechanism, a flexible buffer mechanism and a hook mechanism, wherein the pulley block mechanism, the flexible buffer mechanism and the hook mechanism are arranged in sequence from top to bottom; the flexible buffer mechanism comprises a flexible buffer beam, a main frame, two elastic members and two rollers arranged in parallel, the flexible buffer beam is built into the main frame, arc bearing surfaces are symmetrically arranged on both sides of the flexible buffer beam, the two rollers are slidably connected to the main frame, the opposite sides of the two rollers are respectively tangent to the two arc bearing surfaces, the opposite sides of the two rollers are respectively connected to the two elastic members, and the two elastic members are fixed to the main frame; the technical problem that the force of the entire lifting system changes sharply when the hook is lifting and unloading goods in the prior art, especially when the load is too large, the system force condition is poor and the impact is huge when the goods are taken and placed is solved.

[0008] This technical solution adopts a slider and compression spring shock-absorbing structure. The force applied to the spring in the horizontal direction is equal to half of the lifting weight, which can reduce the specifications of the spring and reduce costs. However, since the slider is a sliding friction, when the lifting mass is very large, it will cause a lot of friction, which may cause the slider to be stuck in the slide groove. The reliability is not high, and the friction between the slider and the frame also reduces the life of the component. It can only be used on small-tonnage hooks.

[0009] Therefore, the prior art has the disadvantages of poor shock absorption effect and high cost, and cannot meet the technical requirements of large-tonnage buffer hooks. Summary of the invention

[0010] The purpose of the present invention is to provide a large-tonnage buffer crane device to solve the technical problems raised in the above-mentioned background technology.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A large-tonnage buffer lifting device comprises a buffer mechanism, a hook connecting mechanism, and a hook body. The buffer mechanism comprises a connecting frame assembly and a pressure frame assembly, a lever assembly, a connecting rod assembly, a push rod assembly, an elastic assembly, and a guide assembly arranged in the connecting frame assembly. The connecting frame assembly is vertically arranged; the pressure frame assembly is movably arranged on the upper side of the middle part of the connecting frame; two lever assemblies are provided, which are respectively arranged on the left and right sides of the pressure frame assembly, and the upper ends thereof are in contact with the pressure frame assembly, and the middle parts are movably connected to the connecting frame assembly; two connecting rod assemblies are provided, which are respectively arranged under the two lever assemblies, and the upper ends thereof are movably connected to the lower ends of the lever assemblies ; Two push rod assemblies are horizontally provided, and one end of the two push rod assemblies facing the vertical center line of the connecting frame assembly is movably connected to the lower end of the connecting rod assembly; Two elastic assemblies are respectively provided at the lower part of the connecting frame assembly, and are respectively connected to one end of the two push rod assemblies away from the vertical center line of the connecting frame assembly; Two guide assemblies are provided corresponding to the push rod assemblies, and the guide assemblies are in contact with the top and bottom surfaces of the two push rod assemblies respectively; The hook connecting mechanism is vertically arranged, and its upper part passes through the front and rear side walls of the connecting frame assembly to be connected to the pressing frame assembly, and can move on the connecting frame assembly; The hook body is movably connected to the lower part of the connecting frame assembly.

[0013] Furthermore, the connecting frame assembly includes a frame plate; two frame plates are arranged at intervals in the front and rear, and the opposite sides of the two frame plates are fixedly connected, and a cavity is formed between the two frame plates; the pressing frame assembly includes a support plate, an inclined pressure plate, and a pressing frame rib plate, and the support plate is a vertically arranged Y-shaped structure, and two are arranged at intervals in the front and rear, and the opposite sides of the two support plates are fixedly connected by the pressing frame rib plate; the inclined pressure plate is arranged on the inclined surfaces on the left and right sides of the upper part of the two support plates.

[0014] Furthermore, a groove is provided in the middle of the top surface of the frame plate; the top of the support plate is higher than the bottom surface of the groove; and a limit plate is also included; the limit plate is horizontally arranged on the top surface of the support plate, and the front and rear ends thereof extend out of the groove of the support plate.

[0015] Furthermore, it also includes a first movable bearing, a bearing plate, and a second movable bearing. The first movable bearing is connected to the left and right sides of the upper part of the opposite side of the support plate through a pin shaft; the bearing plate is vertically arranged on the opposite side of the two support plates, and two bearing plates are arranged on each support plate at intervals on the left and right, and the second movable bearing is connected between the two bearing plates through a pin shaft; the second movable bearing is in contact with the opposite side of the frame plate.

[0016] Furthermore, it also includes an upper baffle plate and a lower baffle plate; the upper baffle plate and the lower baffle plate are arranged between the two frame plates; two upper baffle plates are vertically arranged, respectively located on the left and right sides of the upper part of the pressure frame assembly, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates, and the opposite sides of the two upper baffle plates are respectively in contact with the first movable bearing; two lower baffle plates are vertically arranged, respectively located on the left and right sides of the lower part of the pressure frame assembly, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates, and the opposite sides of the two lower baffle plates are respectively in contact with the second movable bearing.

[0017] Furthermore, the lever assembly includes a lever plate, a lever rib, and a lever bearing; two lever plates are arranged at intervals in the front and rear, the opposite sides of the two lever plates are fixedly connected by the lever rib, the upper parts of the opposite sides of the two lever plates are connected to the lever bearings by pins, and the middle parts are movably connected to the two frame plates by pins; the lever bearings of the two lever assemblies are in contact with the inclined pressure plate.

[0018] Furthermore, the connecting rod assembly comprises a connecting rod member; the upper portion of the connecting rod member is rotatably connected to one end of the two lever plates away from the inclined pressure plate.

[0019] Furthermore, the push rod assembly includes side plates, pads, push rods, spring positioning blocks, and push rod bearings; the side plates are horizontally arranged, and two are spaced apart in the front and rear, the bottoms of the opposite sides of the two side plates are inclined surfaces inclined toward between the two side plates, and the upper parts of the opposite sides of the two side plates away from the vertical centerline of the frame plate are connected to the push rod bearings through pins; the pads are arranged on the side opposite to the side plates; the push rod is horizontally arranged between the pads and fixedly connected to the pads, and one end of the push rod extends out of the side plate toward the vertical centerline of the frame plate and is rotatably connected to 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 centerline of the frame plate.

[0020] Furthermore, the elastic component includes a spring fixing seat and a compression spring; the spring fixing seat is provided with two, and the spring positioning blocks corresponding to the push rod assembly are arranged on the left and right sides of the lower part between the two frame plates, and are fixedly connected to the frame plates, and one end of it is open toward the spring positioning block; the compression spring is arranged horizontally, one end of it is connected to the spring positioning block, and the other end is connected to the spring fixing seat.

[0021] Furthermore, the guide assembly includes a guide groove, a guide bearing, and a guide limit plate; the guide groove is horizontally arranged on the left and right sides of the lower part of the opposite side of each frame plate, and is located below the push rod assembly, the guide grooves on the left and right sides below the two frame plates are arranged correspondingly, and the guide grooves are inclined at a certain angle to the vertical surface of the frame plate, the top surface is open, and the front and rear sides inside are connected to the guide bearings by pins, the top surface of the guide bearing extends out of the top surface of the guide groove and contacts with the inclined surface of the lower part of the side plate; the guide limit plate is horizontally arranged above the push rod assembly, and its bottom surface contacts with the push rod bearing.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The buffer mechanism of the present invention gradually disperses and transmits the huge impact force borne by the hook to the compression spring of the elastic component by arranging a pressure frame assembly, a lever assembly, a connecting rod assembly, a push rod assembly, an elastic component, and a two-stage force reduction mechanism. According to the lever principle and the specific structure and connection relationship of each component, the spring force is effectively reduced, so that the maximum force is only 1 / 15-1 / 20 of the maximum lifting weight. Compared with the traditional coaxial unreduced compression spring method, the spring stiffness coefficient is significantly reduced, the shock absorption effect is greatly improved, and it can meet large-tonnage lifting operations. The risk of the hook head being broken due to strong impact during large-tonnage lifting operations is effectively avoided. At the same time, the reverse impact on the crane boom is effectively reduced, and the occurrence of tower collapse accidents is greatly reduced.

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

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 is a cross-sectional view of the present invention in an unloaded state;

[0027] Figure 3 is a cross-sectional view of the present invention when fully loaded;

[0028] Figure 4 It is a structural schematic diagram of the connecting frame assembly of the present invention;

[0029] Figure 5 is a cross-sectional view of a connecting frame assembly of the present invention;

[0030] Figure 6 It is a schematic diagram of the internal structure of the connecting frame assembly of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the press frame assembly of the present invention;

[0032] Figure 8 is a cross-sectional view of a press frame assembly of the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the lever assembly of the present invention;

[0034] Fig.10 It is a structural schematic diagram of the connecting rod assembly of the present invention;

[0035] Fig.11 It is a structural schematic diagram of the ejector assembly of the present invention;

[0036] Fig.12 is a front view of the ejector assembly of the present invention;

[0037] Fig.13 The present invention Figure 2 The enlarged view of point A in the middle;

[0038] In the accompanying drawings; 1- buffer mechanism;

[0039] 11-connecting frame assembly; 111-frame 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-supporting plate; 1211-connecting hole; 122-oblique pressing plate; 123-pressing frame rib plate; 124-limiting plate; 125-a movable bearing; 126-bearing plate; 127-a second movable 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 member; 1411-fourth movable hole; 1412-fifth movable hole; 142-connecting rod bearing;

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

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

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

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

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

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0049] like Figure 1-13As shown, a large-tonnage buffer lifting device includes a buffer mechanism 1, a hook connecting mechanism 2, and a hook body 3. The buffer mechanism 1 includes a connecting frame assembly 11 and a pressure frame assembly 12, a lever assembly 13, a connecting rod assembly 14, a push rod assembly 15, an elastic assembly 16, and a guide assembly 17 arranged in the connecting frame assembly 11. 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; there are two lever assemblies 13, which are respectively arranged on the left and right sides of the pressure frame assembly 12, and the upper ends thereof are in contact with the pressure frame assembly 12, and the middle parts are movably connected to the connecting frame assembly 11; there are two connecting rod assemblies 14, which are respectively arranged under the two lever assemblies 13, and the upper ends thereof are connected to the lower parts of the lever assemblies 13. The ends are movably connected; the described push rod assemblies 15 are horizontally provided with two, and one end of the two push rod assemblies 15 facing the vertical center line of the connecting frame assembly 11 is movably connected to the lower end of the connecting rod assembly 14; the described elastic assemblies 16 are provided with two, which are respectively arranged at the lower part of the connecting frame assembly 11, and are respectively connected to one end of the two push rod assemblies 15 away from the vertical center line of the connecting frame assembly 11; the described guide assembly 17 is arranged below the push rod assembly 15, and its top surface is in contact with the bottom surface of the push rod assembly 15; the described hook connecting mechanism 2 is vertically arranged, and its upper part passes through the front and rear side walls of the connecting frame assembly 11 and is connected to the pressing frame assembly 12, and can move on the connecting frame assembly 11; the described hook body 3 is movably connected to the lower part of the connecting frame assembly 11, and the hook body 3 is provided with an anti-drop 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 down, and the lever assembly 13 rotates based on the connection 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 push rod assembly 15 into the elastic assembly 16; when the hook is unloaded, the elastic assembly 16 pushes the push rod assembly 15 to move toward the vertical center line of the frame plate 111. During the movement, the push 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, and the lever assembly 13 rotates based on the connection 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 and resets.

[0050] like Figure 1-6As shown, the connecting frame assembly 11 includes a frame plate 111; two frame plates 111 are arranged at intervals in the front and rear, and the two frame plates 111 are fixedly connected on opposite sides, and a cavity is formed between the two frame plates 111; a front-to-back through channel 1112 is opened in the middle of the frame plate 111, and mounting holes 1113 are opened on the left and right sides of the upper part, and through holes 1114 are opened on 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 provided with a pulley assembly 6 for winding the lifting rope; the through hole 1114 is provided with a connecting bearing 1115 for connecting the lever assembly 13.

[0051] like Figure 7-8 As shown, the press frame assembly 12 includes a support plate 121, an inclined pressure plate 122, and a press frame rib plate 123. The support plate 121 is a vertically arranged Y-shaped structure, and two support plates 121 are arranged at intervals in front and behind. The opposite sides of the two support plates 121 are fixedly connected by the press frame rib plate 123. A connecting hole 1211 that passes through the front and back is opened at the lower part of the support plate 121. The position of the connecting hole 1211 corresponds to the position of the channel 1112 of the frame plate 111. The connecting hole 1211 of the support plate 121 is passed through the pin shaft. 1 and the channel 1112 of the frame plate 111, the hook connection mechanism 2 is connected to the support plate 121, the hook connection mechanism 2 can move along the channel 1112, when fully loaded, the hook body 3 drives the hook connection structure to move downward in the channel 1112, so that the pressing frame assembly 12 moves downward in the frame plate 111; the inclined pressure plate 122 is arranged on the inclined surfaces on the left and right sides of the upper parts of the two support plates 121; when the pressing frame assembly 12 moves downward, the inclined pressure plate 122 moves downward, thereby pressing the lever assembly 13 downward.

[0052] like Figure 1-8 As shown, a groove 1111 is provided in the middle of the top surface of the frame plate 111; the top of the support plate 121 is higher than the bottom surface of the groove 1111; and a limit plate 124 is also included; the limit plate 124 is horizontally arranged on the top surface of the support plate 121, and its front and rear ends extend out of the groove 1111 of the frame plate 111. When unloaded, the limit plate 124 is a certain distance away from the bottom surface of the groove 1111, and when fully loaded, the limit plate 124 moves downward and is stuck on the groove 1111; the limit plate 124 is used to prevent the hook body 3 from suddenly falling down and causing a safety accident when the compression spring 162 of the elastic component 16 fails.

[0053] like Figure 7-8As shown, it also includes a first movable bearing 125, a bearing plate 126, and a second movable bearing 127. The first movable bearing 125 is connected to the upper and lower left and right sides of the opposite side of the support plate 121 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 two bearing plates 126 are arranged on each support plate 121 at intervals on the left and right, and a 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 pressure frame assembly 12 moves, the second movable bearing 127 can slide on the frame plate 111 to ensure the movement stability and smoothness of the pressure frame assembly 12.

[0054] like Figure 2-6 As shown, it also includes an upper baffle plate 112 and a lower baffle plate 113; the upper baffle plate 112 and the lower baffle plate 113 are arranged between the two frame plates 111; two upper baffle plates 112 are vertically arranged, respectively located on the left and right sides of the upper part of the pressure frame assembly 12, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates 111, and the opposite sides of the two upper baffle plates 112 are respectively in contact with the first movable bearing 125; two lower baffle plates 113 are vertically arranged, respectively located on the left and right sides of the lower part of the pressure frame assembly 12, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates 111, and the opposite sides of the two lower baffle plates 113 are respectively in contact with the second movable bearing 127. When the pressure frame assembly 12 moves, the first movable bearing 125 on the upper part of the support plate 121 can move on the upper baffle plate 112, and the second movable bearing 127 on the lower part can move on the lower baffle plate 113. The second movable bearings 127 on the front and rear sides can move on the frame plate 111, further ensuring the movement stability of the pressure frame assembly 12 and preventing swinging and deviation. At the same time, the upper baffle plate 112 and the lower baffle plate 113 are used to connect the frame plates 111 to each other.

[0055] like Fig. 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, and the two lever plates 131 are spaced apart and provided with a first movable hole 1311, a second movable hole 1312, and a third movable hole 1313; the first movable hole 1311 on the upper part of the opposite side of the lever plate 131 is connected to the lever bearing 133 through a pin, and the inner ring of the lever bearing 133 is fixedly sleeved on the pin, and the second movable hole 1312 in the middle is connected to the connecting bearing 1115 in the through hole 1114 of the two frame plates 111 through the pin, so that the lever plate 131 can rotate based on the pin through the second movable hole 1312; the lever bearings 133 of the two lever assemblies 13 are in contact with the inclined pressure plate 122. When fully loaded, when the pressing frame assembly 12 moves downward, the inclined pressure plate 122 presses down the lever bearing 133 to rotate the lever plate 131; when unloaded, the lever plate 131 rotates to push the lever bearing 133 upward to reset the pressing frame assembly 12.

[0056] In a further embodiment, the lever plate force arm ratio is set to 1.5-2. Under this force arm ratio, the lever plate 131 can effectively transmit the force transmitted from the pressure 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, thereby optimizing the buffering effect of the entire buffer mechanism.

[0057] like Fig.10 As shown, the connecting rod assembly 14 includes a connecting rod 141; the connecting rod 141 is provided with a fourth movable hole 1411 at the upper part and a fifth movable hole 1412 at the lower part, and connecting rod bearings 142 are provided in the fourth movable hole 1411 and the fifth movable hole 1412, and the connecting rod bearings 142 in the fourth movable hole 1411 at the upper part of the connecting rod 141 are rotatably connected with the third movable hole 1313 at one end of the two lever plates 131 away from the inclined pressure 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 push rod assembly 15 to move away from the vertical center line of the frame plate 11; when unloaded, the push rod assembly 15 moves toward the vertical center line of the frame plate 11, pushing the lower end of the connecting rod 141, so that the upper end of the connecting rod 141 pulls the lower end of the lever plate 131 downward, thereby causing the upper end of the lever plate 131 to rotate upward, so that the lever bearing 133 pushes the frame pressing assembly 12 to reset upward.

[0058] like Figure 3As shown, the connecting rod 141 is set to: when fully loaded, the angle between the connecting rod 141 and the vertical plane is 5°. This design can optimize the force transmission path. When the lever assembly 13 rotates due to the downward pressure of the pressure frame assembly 12 and pulls the upper end of the connecting rod 141, this angle helps to more reasonably decompose the force into the direction of pushing the push rod assembly 15 to move. In this way, the force transmitted to the push rod assembly 15 can act in the expected direction and magnitude, so that the push rod assembly 15 applies appropriate pressure to the compression spring 162 of the elastic assembly 16, and finally the maximum force of the compression spring 162 is only 1 / 15-1 / 20 of the maximum lifting weight, which effectively reduces the burden of the compression spring 162.

[0059] like Figure 11-12 As shown, the push rod assembly 15 includes a side plate 151, a pad 152, a push rod 153, a spring positioning block 154, and a push rod bearing 155; the side plate 151 is horizontally arranged, and two are arranged at intervals in front and behind, the bottom of the opposite side of the two side plates 151 is a 45° chamfered inclined surface inclined toward the two side plates 151, and the upper part of the opposite side of the two side plates 151 away from the vertical center line direction 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 to the pin shaft, and the bottom of the side plate 151 is a 45° chamfer; the pad 152 is arranged on the side opposite to the side plate 151; the side plate 15 1 and the top of the pad 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 pads 152 and fixedly connected to the pad 152, and its end facing the vertical center line direction 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 member 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 direction of the frame plate 111.

[0060] like Figure 2-3 As shown in Figures 5-6, the elastic component 16 includes a spring fixing seat 161 and a compression spring 162; the spring fixing seat 161 is provided with two spring positioning blocks 154 of the push rod assembly 15, which are respectively arranged on the left and right sides of the lower part between the two frame plates 111, and one end of which is open toward the spring positioning block 154; the compression spring 162 is arranged horizontally, one end of which is connected to the spring positioning block 154, and the other end is connected to 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 condition, the compression spring 162 pushes the push rod assembly 15 to reset the frame pressing assembly 12.

[0061] like Figure 2-3 As shown in , 5-6, the guide assembly 17 includes a guide groove 171, a guide bearing 172, and a guide limit 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 push rod assembly 15, the guide grooves 171 on the left and right sides below the two frame plates 111 are correspondingly arranged, and the guide grooves 171 and the frame plates 111 are arranged at 45°, so that the guide bearing 172 can contact the chamfered inclined surface of the lower part of the side plate 151, the top surface of the guide groove 171 is open, and the front and rear sides of the interior are connected with the guide bearing 172 through a pin shaft, and the inner ring of the guide bearing 172 is fixedly sleeved on the pin shaft; the top surface of the guide bearing 172 extends out of the top surface of the guide groove 171, and contacts with the chamfered bottom surface of the side plate 151 of the push rod assembly 15; the guide limit plate 173 is horizontally arranged above the push rod assembly 15, and its bottom surface contacts with the push rod bearing 155. When the push rod assembly 15 moves, the push rod bearing 155 can move on the bottom surface of the limit plate 124 to ensure the movement stability of the connecting rod assembly 14, and the guide limit plate 173 connects the two frame plates 111 to each other. The guide bearing 172 and the guide limit plate 173 limit the movement of the push rod assembly 15, wherein the inclined guide groove 171 and the guide bearing 172 can limit the push rod assembly 15 from moving downward and forward and backward, and the guide limit plate 173 limits the push rod assembly 15 from moving upward, so that the push rod assembly 15 can only move in the horizontal direction, and at the same time, the push rod bearing 155 moves at the bottom of the limit plate 124, and the bottom of the side plate 151 moves on the guide bearing 172, so as to ensure the movement stability of the push rod assembly 15.

[0062] like Fig.13 As shown, the hook connection mechanism 2 includes a connection plate 21, a hook nut 22, a thrust bearing 23, and a hook crossbeam 24; the connection plate 21 is vertically arranged, and two are arranged at intervals in front and behind, and circular holes 211 are opened on the upper and lower parts of the connection plate 21, and the opposite sides of the two connection plates 21 correspond to the opposite sides of the two frame plates 111, and the circular hole 211 on the upper part of the connection plate 21 corresponds to the channel 1112 on the frame plate 111, and the connection plate 21 is connected by passing the pin through the channel 1112 and the circular hole 211 on the upper part of the connection plate 21 and the connection hole 1211 of the support plate 121. , 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 the opposite side of 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 through the round rods and the round holes 211 at the lower part of the connecting plates 21; the thrust bearing 23 is horizontally arranged, and its outer ring is fixedly arranged in the middle part of the hook beam 24; the upper part of the hook body 3 is provided with a thread, and the upper part of the hook body 3 passes through the inner ring of the thrust bearing 23 upwards, 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 present invention is:

[0064] When the hook is in a fully loaded state, that is, when it starts to lift a heavy object, the hook body 3 generates a downward pulling force due to the gravity of the heavy object, and the pulling force is transmitted to the press frame assembly 12 via the hook connection mechanism 2. After the press frame assembly 12 is subjected to force, it moves downward stably along the channel 1112 on the frame plate 111 of the connecting frame assembly 11. During the movement, the inclined pressure plate 122 of the press frame assembly 12 applies downward pressure to 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 connection point between it and the frame plate 111, and the lower end of the lever plate 131 is lifted upward, and the upper end of the connecting rod member 141 of the connecting rod assembly 14 is pulled through the connecting rod bearing 142, so that the connecting rod member 141 rotates, and then the lower end of the connecting rod member 141 pushes the top rod 153 of the top rod assembly 15. The push rod assembly 15, under the push of the connecting rod 141, moves horizontally in the direction away from the vertical center line of the frame plate 111 under the coordinated constraints of the limit plate 124, the push rod bearing 155 and the guide bearing 172. The spring positioning block 154 of the push rod assembly 15 applies pressure to the compression spring 162 of the elastic assembly 16 during the movement, so that the compression spring 162 is gradually compressed, thereby converting the impact force generated by the heavy object when the hook is lifted into the elastic potential energy of the spring for storage, effectively buffering the impact force on the hook, ensuring the stability and safety of the entire lifting process, and avoiding safety accidents such as the hook head breaking or the crane boom being damaged due to excessive impact force.

[0065] When the hook is in an unloaded state, the compression spring 162 in the elastic assembly 16 applies an outward thrust to the spring positioning block 154 of the push rod assembly 15 by virtue of its own elastic restoring force. Under the action of this thrust, the bottom surface of the side plate 151 of the push rod assembly 15 rolls along the guide bearing 172 of the guide assembly 17, and under the restriction of the guide limit plate 173, it can only stably move in the horizontal direction toward the vertical center line direction of the frame plate 111. At this time, the push rod 153 of the push rod assembly 15 pushes the lower end of the connecting rod member 141 of the connecting rod assembly 14 through the connecting rod bearing 142, so that the connecting rod member 141 rotates around the connection point between it and the lever assembly 13, so that the upper end of the connecting rod member 141 generates a downward pulling force on the lower end of the lever plate 131 of the lever assembly 13. The lever plate 131 rotates with the connection point between it and the connecting bearing 1115 in the through hole 1114 of the frame plate 111 as the axis, and the lever bearing 133 at the upper end of the lever plate 131 pushes upward the inclined pressure plate 122 of the pressing frame assembly 12. During the movement of the pressing frame assembly 12, the first movable bearing 125 on the support plate 121 rolls smoothly on the upper baffle plate 112, and the second movable bearing 127 rolls on the lower baffle plate 113 and the frame plate 111, ensuring that the pressing frame assembly 12 can move upward stably along the predetermined trajectory, thereby driving the hook connection mechanism 2 and the hook body 3 connected thereto to move upward synchronously, so that the entire hook system returns to the initial no-load position, waiting for the next lifting task.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A large-tonnage buffer lifting device, comprising a buffer mechanism, a hook connecting mechanism, and a hook body, characterized in that: The buffer mechanism includes a connecting frame assembly and a pressure frame assembly, a lever assembly, a connecting rod assembly, a push rod assembly, an elastic assembly, and a guide assembly arranged in the connecting frame assembly. The connecting frame assembly is vertically arranged; the push rod assembly is movably arranged on the upper middle side of the connecting frame; there are two lever assemblies, which are respectively arranged on the left and right sides of the pressure frame assembly, and the upper ends thereof are in contact with the pressure frame assembly, and the middle parts are movably connected to the connecting frame assembly; there are two connecting rod assemblies, which are respectively arranged under the two lever assemblies, and the upper ends thereof are movably connected to the lower ends of the lever assemblies; there are two push rod assemblies horizontally, One end of the two push rod assemblies facing the vertical center line of the connecting frame assembly is movably connected to the lower end of the connecting rod assembly; two elastic assemblies are provided, which are respectively arranged at the lower part of the connecting frame assembly, and are respectively connected to one end of the two push rod assemblies away from the vertical center line of the connecting frame assembly; two guide assemblies are provided corresponding to the push rod assemblies, and the guide assemblies are in contact with the top and bottom surfaces of the two push rod assemblies respectively; the hook connecting mechanism is vertically arranged, and its upper part passes through the front and rear side walls of the connecting frame assembly to be connected to the pressure frame assembly, and can move on the connecting frame assembly; the hook body is movably connected to the lower part of the connecting frame assembly.

2. A large-tonnage buffer crane device according to claim 1, characterized in that: The connecting frame assembly includes a frame plate; two frame plates are arranged at intervals in front and back, and the opposite sides of the two frame plates are fixedly connected, forming a cavity between the two frame plates; the pressing frame assembly includes a support plate, an inclined pressure plate, and a pressing frame rib plate, the support plate is a vertically arranged Y-shaped structure, and two are arranged at intervals in front and back, and the opposite sides of the two support plates are fixedly connected by the pressing frame rib plate; the inclined pressure plate is arranged on the inclined surfaces on the left and right sides of the upper part of the two support plates.

3. A large-tonnage buffer crane device according to claim 2, characterized in that: A groove is provided in the middle of the top surface of the frame plate; the top of the support plate is higher than the bottom surface of the groove; and a limit plate is also included; the limit plate is horizontally arranged on the top surface of the support plate, and the front and rear ends thereof extend out of the groove of the support plate.

4. A large-tonnage buffer crane device according to claim 3, characterized in that: It also includes a first movable bearing, a bearing plate, and a second movable bearing. The first movable bearing is connected to the left and right sides of the upper part of the opposite side of the support plate through a pin shaft; the bearing plate is vertically arranged on the opposite side of the two support plates, and two bearing plates are arranged on each support plate at intervals on the left and right, and the second movable bearing is connected between the two bearing plates through a pin shaft; the second movable bearing is in contact with the opposite side of the frame plate.

5. A large-tonnage buffer crane device according to claim 4, characterized in that: It also includes an upper baffle plate and a lower baffle plate; the upper baffle plate and the lower baffle plate are arranged between the two frame plates; two upper baffle plates are vertically arranged, respectively located on the left and right sides of the upper part of the pressure frame assembly, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates, and the opposite sides of the two upper baffle plates are respectively in contact with the first movable bearing; two lower baffle plates are vertically arranged, respectively located on the left and right sides of the lower part of the pressure frame assembly, and the front and rear sides thereof are fixedly connected to the opposite side of the two frame plates, and the opposite sides of the two lower baffle plates are respectively in contact with the second movable bearing.

6. A large-tonnage buffer crane device according to claim 3, characterized in that: The lever assembly includes a lever plate, a lever rib, and a lever bearing; two lever plates are arranged at intervals in front and back, the opposite sides of the two lever plates are fixedly connected by the lever rib, the upper parts of the opposite sides of the two lever plates are connected to the lever bearings by pins, and the middle parts are movably connected to the two frame plates by pins; the lever bearings of the two lever assemblies are in contact with the inclined pressure plate.

7. A large-tonnage buffer crane device according to claim 6, characterized in that: The connecting rod assembly comprises a connecting rod member; the upper part of the connecting rod member is rotatably connected to one end of the two lever plates away from the inclined pressure plate.

8. A large-tonnage buffer crane device according to claim 7, characterized in that: The push rod assembly includes side plates, pads, push rods, spring positioning blocks, and push rod bearings; the side plates are horizontally arranged, and two are spaced apart in the front and rear, the bottom of the opposite side of the two side plates is an inclined surface inclined toward between the two side plates, and the upper parts of the opposite sides of the two side plates away from the vertical centerline of the frame plate are connected to the push rod bearings through pins; the pads are arranged on the side opposite to the side plates; the push rod is horizontally arranged between the pads and fixedly connected to the pads, and one end of the push rod extends out of the side plate toward the vertical centerline of the frame plate and is rotatably connected to 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 centerline of the frame plate.

9. A large-tonnage buffer crane device according to claim 8, characterized in that: The elastic component includes a spring fixing seat and a compression spring; the spring fixing seat is provided with two, and the spring positioning blocks corresponding to the push rod assembly are arranged on the left and right sides of the lower part between the two frame plates, and are fixedly connected to the frame plates, and one end of it is open toward the spring positioning block; the compression spring is arranged horizontally, one end of it is connected to the spring positioning block, and the other end is connected to the spring fixing seat.

10. A large-tonnage buffer crane device according to claim 8, characterized in that: The guide assembly includes a guide groove, a guide bearing, and a guide limit plate; the guide groove is horizontally arranged on the left and right sides of the lower part of the opposite side of each frame plate, and is located below the push rod assembly. The guide grooves on the left and right sides below the two frame plates are arranged correspondingly, and the guide grooves are inclined at a certain angle to the vertical surface of the frame plate. The top surface is open, and the guide bearings are connected to the front and rear sides of the interior through pins. The top surface of the guide bearing extends out of the top surface of the guide groove and contacts the inclined surface of the lower part of the side plate; the guide limit plate is horizontally arranged above the push rod assembly, and its bottom surface contacts the push rod bearing.

Images