Small-sized manual rocker arm crane

Abstract

The utility model discloses a small-sized manual rocker arm crane which comprises a supporting stand column, a rotating main shaft is arranged on the supporting stand column, the lower end of the rotating main shaft is connected with the supporting stand column in a rotating mode, a first pull rod and a second pull rod are arranged at the upper end of the rotating main shaft, and a main hanging beam and an auxiliary hanging beam are arranged on the rotating main shaft. The first pull rod is connected with a main lifting beam, the second pull rod is connected with an auxiliary lifting beam, a lifting group is slidably connected to the main lifting beam, a driving mechanism is arranged on the auxiliary lifting beam and drives the lifting group to slide back and forth on the main lifting beam, a counterweight mechanism is arranged on the auxiliary lifting beam, and a hoisting mechanism is arranged on the lifting group. The hoisting mechanism on the hoisting group can rotate through the rotating main shaft after hoisting an object to a certain height, meanwhile, the hoisting group can slide on the main hoisting beam, the moving range of the object is widened, and the balance weight mechanism is arranged on the auxiliary hoisting beam, so that the maximum bearing weight of the main hoisting beam is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting equipment, and more specifically relates to a small manual swing jib crane. Background Art

[0002] At present, small cranes are widely used, such as for car repair in a fitter's workshop, processing, assembling or disassembling of mechanical equipment parts, and production and assembly of small mechanical equipment, or for installation and lifting of underground and underwater operation equipment in the open air, or for loading and unloading of goods in daily production and life.

[0003] At present, most small cranes are of a single-arm structure on one side or a gantry type. The single-arm structure can drive an object to rotate, but its maximum load-bearing capacity is generally small (less than 500 kg). The gantry crane has a large load-bearing capacity, but it can only drive the object to move horizontally left and right, with great limitations. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a small manual swing jib crane, which can drive an object to move and rotate after lifting the object, improving the moving range of the object and having a large load-bearing capacity.

[0005] To achieve the above object, the utility model provides the following technical solution: A small manual swing jib crane includes a support column, a rotating main shaft is arranged on the support column, the lower end of the rotating main shaft is rotationally connected to the support column, a first pull rod and a second pull rod are arranged at the upper end of the rotating main shaft, a main lifting beam and a secondary lifting beam are arranged on the rotating main shaft, the first pull rod is connected to the main lifting beam, the second pull rod is connected to the secondary lifting beam, a lifting assembly is slidably connected to the main lifting beam, a driving mechanism is arranged on the secondary lifting beam, the driving mechanism drives the lifting assembly to slide back and forth on the main lifting beam, a counterweight mechanism is arranged on the secondary lifting beam, and a hoisting mechanism is arranged on the lifting assembly.

[0006] Further, the lifting assembly includes support plates on both sides of the main lifting beam, two support wheels and two guide wheels are arranged on the support plates, the support wheels are in rolling connection above the main lifting beam, the guide wheels are in rolling connection below the main lifting beam, two parallel connecting shafts are arranged between the two support plates, the guide wheels are rotationally connected to the connecting shafts, a lifting lug is arranged on one of the connecting shafts, the lifting lug is connected to the hoisting mechanism, and the two support plates are connected to a driving machine.

[0007] Further, support shafts corresponding to each support wheel are arranged on the support plates, and the support wheels are rotationally connected to the support shafts.

[0008] Further, the driving mechanism includes a wire rope contraction wheel, a first wire rope and a second wire rope wound around the wire rope contraction wheel. Two symmetric thread contraction grooves are provided on the wire rope contraction wheel. When the first wire rope rotates and winds around the wire rope contraction wheel, the second wire rope pays out. When the second wire rope rotates and winds around the wire rope contraction wheel, the first wire rope pays out. A first connecting plate and a second connecting plate are respectively provided on the two support plates. Fixed components are provided on both the first connecting plate and the second connecting plate, and the fixed component on the first connecting plate is above the fixed component on the second connecting plate. The end of the first wire rope is fixedly connected to the fixed component on the first connecting plate. A steering guide wheel is provided at the end of the main lifting beam. The second wire rope passes over the fixed component on the second connecting plate, bypasses the steering guide wheel and is fixedly connected to the fixed component on the second connecting plate.

[0009] Further, the fixed component includes a fixed column, a spring seat is provided on the fixed column, an adjusting spring is provided between the spring seat and the fixed rod, and the wire rope passes through the fixed rod and the adjusting spring and is fixedly connected to the spring seat.

[0010] Further, a tensioning mechanism is provided on the rotating main shaft. The tensioning mechanism includes a tensioning seat. Two tensioning rods corresponding to the first wire rope and the second wire rope are slidably connected to the tensioning seat. Tensioning springs are sleeved on the tensioning rods, and the wire rope passes through the tensioning rods.

[0011] Further, a servo motor or a manual driving device is connected to the wire rope contraction wheel.

[0012] Further, the manual driving device includes a driving shaft, two ratchets with opposite ratchet teeth on the driving shaft, and a fixed seat fixedly connected to the driving shaft. The driving shaft is connected to the rotating shaft of the wire rope contraction wheel. A handle seat is rotatably connected to the fixed seat. Two sliding sleeves are slidably connected to the handle seat. Poking pins corresponding to the ratchets are slidably connected in the sliding sleeves. A first spring is provided between the sliding sleeve and the fixed seat. A second spring is provided between the poking pin and the sliding sleeve. A fork is movably connected to the handle seat. The fork is located below the sliding sleeve, and the poking rods on both sides thereof are respectively abutted against the two sliding sleeves. A connecting rod is connected to the bottom end of the handle seat. A driving sleeve is sleeved on the connecting rod. The driving sleeve is movably connected to the connecting rod. The end face of the driving sleeve close to the fork is an inclined plane, and one side of the end is a tip. A fixing mechanism is provided between the driving sleeve and the connecting rod. A handle sleeve is connected to the driving sleeve.

[0013] Further, the fixing mechanism includes a spring positioning pin telescopically connected to the connecting rod. One end of the spring positioning pin extends out of the surface of the connecting rod and abuts against the lower end of the handle sleeve. A retaining ring is provided on the connecting rod, and the retaining ring is located below the spring positioning pin.

[0014] Furthermore, the counterweight mechanism includes a counterweight hook located on the auxiliary lifting beam and a fixed flange located on the support column, and a lifting hole corresponding to the counterweight hook is provided on the fixed flange.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: after the lifting mechanism on the lifting unit lifts an item to a certain height, it can rotate by rotating the main shaft, and at the same time, the lifting unit can also slide on the main lifting beam, improving the moving range of the item. A counterweight mechanism is provided on the auxiliary lifting beam, thereby increasing the maximum load-bearing weight of the main lifting beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the small manual jib crane of the present utility model;

[0017] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0018] Figure 3 is Figure 1 a cross-sectional view taken along line B-B in

[0019] Figure 4 is a schematic diagram of the structure of the tensioning mechanism in the small manual jib crane of the present utility model;

[0020] Figure 5 is a schematic diagram of the side structure of the lifting unit in the small manual jib crane of the present utility model;

[0021] Figure 6 is a schematic diagram of the cross-sectional structure of the lifting unit in the small manual jib crane of the present utility model when viewed from above;

[0022] Figure 7 is a schematic diagram of the structure of the manual driving device in the small manual jib crane of the present utility model;

[0023] Figure 8 is a schematic diagram of the structure of the fixing mechanism in the small manual jib crane of the present utility model;

[0024] Figure 9 is a schematic diagram of the structure of the wire rope retraction wheel in the small manual jib crane of the present utility model;

[0025] Figure 10 is Figure 1 an enlarged view of part C in

[0026] Figure 11 is another placement diagram of the manual driving device on the auxiliary lifting beam in the small manual jib crane of the present utility model.

[0027] Figure numerals: support column 1; rotating main shaft 2; first tie rod 3; second tie rod 4; main suspension beam 5; auxiliary suspension beam 6; suspension group 7; driving mechanism 8; counterweight mechanism 9; lifting mechanism 10 support plate 11; support wheel 12; guide wheel 13; connecting shaft 14; lifting lug 15; support shaft 16; fixed block 17; safety block 18; pull plate 19; pull plate bolt 20; adjusting nut 21; limit bolt 22; waist-shaped vertical hole 23; wire rope retraction wheel 24; first wire rope 25; second wire rope 26; threaded retraction groove 27; first connecting plate 28; second connecting plate 29; fixing assembly 30; steering guide wheel 31; fixing column 32; spring seat 33; adjusting spring 34; wheel seat 35; rotating shaft 36; transmission block 37; tensioning seat 38; tensioning rod 39; tensioning spring 40; driving shaft 41; ratchet 42; fixing seat 43; handle seat 44; sliding sleeve 45; toggle pin 46; first spring 47; second spring 48; shift fork 49; connecting rod 50; driving sleeve 51; spline shaft 52; waist-shaped through hole 53; elastic pin 54; spring locating pin 55; retaining ring 56; fixing flange 57; support frame 58; handle sleeve 59. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" and "a number" is two or more, unless otherwise clearly and specifically defined.

[0030] Reference Figures 1 to 11 The utility model is further described.

[0031] A small manual jib crane, comprising a support column 1, a rotating main shaft 2 is arranged on the support column 1, the lower end of the rotating main shaft 2 is rotatably connected to the support column 1, a first pull rod 3 and a second pull rod 4 are arranged at the upper end of the rotating main shaft 2, a main lifting beam 5 and a secondary lifting beam 6 are arranged on the rotating main shaft 2, the first pull rod 3 is connected to the main lifting beam 5, the second pull rod 4 is connected to the secondary lifting beam 6, a lifting assembly 7 is slidably connected to the main lifting beam 5, a driving mechanism 8 is arranged on the secondary lifting beam 6, the driving mechanism 8 drives the lifting assembly 7 to slide back and forth on the main lifting beam 5, a counterweight mechanism 9 is arranged on the secondary lifting beam 6, and a hoisting mechanism 10 is arranged on the lifting assembly 7.

[0032] As Figures 1 to 11 shown, after the hoisting mechanism 10 on the lifting assembly 7 hoists an item to a certain height, it can rotate through the rotating main shaft 2. At the same time, the lifting assembly 7 can also slide on the main lifting beam 5, improving the moving range of the item. A counterweight mechanism 9 is arranged on the secondary lifting beam 6, thereby increasing the maximum load-bearing weight of the main lifting beam 5.

[0033] As Figure 1 shown, preferably in this embodiment, the support column 1 comprises a plurality of cylindrical columns, and the diameters of the plurality of cylindrical columns gradually decrease from bottom to top. The cylindrical column with a large diameter is sleeved outside the cylindrical column with a small diameter and welded. An appropriate number of cylindrical columns can be selected for combination according to the on-site hoisting requirements.

[0034] As Figure 2 and Figure 3 shown, preferably in this embodiment, the lifting assembly 7 comprises support plates 11 on both sides of the main lifting beam 5. Two support wheels 12 and two guide wheels 13 are arranged on the support plates 11. The support wheels 12 are in rolling connection above the main lifting beam 5, and the guide wheels 13 are in rolling connection below the main lifting beam 5. Two parallel connecting shafts 14 are arranged between the two support plates 11. The guide wheels 13 are rotatably connected to the connecting shafts 14. A lifting lug 15 is arranged on one of the connecting shafts 14. The lifting lug 15 is connected to the hoisting mechanism 10, and the two support plates 11 are connected to the driving mechanism 8.

[0035] Specifically, the driving mechanism 8 can pull the support plates 11 on both sides of the support plates 11, enabling the support plates 11 to slide horizontally left and right on the main lifting beam 5. The support wheels 12 roll above the main lifting beam 5, and the guide wheels 13 provide stability for the movement of the lifting assembly 7.

[0036] Specifically, guide rails corresponding to the support wheels 12 and the guide wheels 13 are arranged on both the upper side and the lower side of the main lifting beam 5.

[0037] As Figure 2 and Figure 3 shown, specifically, the main lifting beam 5 is an I-beam or composed of two channel steels attached back to back, and the guide rails are the sides of the I-beam or the channel steels.

[0038] As Figure 2 shown, preferably in this embodiment, a support shaft 16 corresponding to each support wheel 12 is provided on the support plate 11, and the support wheel 12 is rotatably connected to the support shaft 16.

[0039] As Figure 1 shown, preferably in this embodiment, two fixed stoppers 17 are fixedly connected to the main lifting beam 5. A safety stopper 18 is arranged between the two fixed stoppers 17. The upper ends on both sides of the safety stopper 18 are stuck on the guide rails of the main lifting beam 5, and the lower end is located between the two fixed stoppers 17. The sliding range of the lifting assembly 7 can be limited by the safety stopper 18, and at the same time, the continuous sliding of the lifting assembly 7 can also be prevented, including when the lifting assembly 7 is on the left side, right side of the safety stopper 18 or between the two support wheels 12.

[0040] As Figure 10 shown, preferably in this embodiment, two pull plates 19 are arranged on the rotating main shaft 2. The two pull plates 19 are connected by a pull plate bolt 20 and a nut. A spacer sleeve is sleeved on the pull plate bolt 20. The two pull plates 19 are respectively located on both sides of the end of the rotating main shaft 2. The first pull rod 3 and the second pull rod 4 are respectively connected to the spacer sleeve. An adjusting nut 21 is arranged below the pull plate 19. The adjusting nut 21 is threadedly connected to the rotating main shaft 2. The adjusting nut 21 supports the two pull plates 19. A limit bolt 22 is arranged between the two pull plates 19. A kidney-shaped vertical hole 23 is arranged on the rotating main shaft 2. The limit bolt 22 passes through the kidney-shaped vertical hole 23.

[0041] As Figures 1 to 9 shown, preferably in this embodiment, the driving mechanism 8 includes a wire rope contraction wheel 24 and a first wire rope 25 and a second wire rope 26 wound around the wire rope contraction wheel 24. Two symmetric threaded contraction grooves 27 are arranged on the wire rope contraction wheel 24. When the first wire rope 25 rotates and winds with the wire rope contraction wheel 24, the second wire rope 26 pays out. When the second wire rope 26 rotates and winds with the wire rope contraction wheel 24, the first wire rope 25 pays out. A first connecting plate 28 and a second connecting plate 29 are respectively arranged on the two support plates 11. Fixed components 30 are arranged on both the first connecting plate 28 and the second connecting plate 29, and the fixed component 30 on the first connecting plate 28 is located above the fixed component 30 on the second connecting plate 29. The end of the first wire rope 25 is fixedly connected to the fixed component 30 on the first connecting plate 28. A steering guide wheel 31 is arranged at the end of the main lifting beam 5. The second wire rope 26 passes over the fixed component 30 on the second connecting plate 29, bypasses the steering guide wheel 31 and is fixedly connected to the fixed component 30 on the second connecting plate 29.

[0042] Specifically, when the wire rope retraction wheel 24 rotates to retract the first wire rope 25, the second wire rope 26 pays out. At this time, the first wire rope 25 pulls the first connecting plate 28, thereby pulling the entire lifting group 7 towards the wire rope retraction wheel 24. When the wire rope retraction wheel 24 rotates in the reverse direction, the first wire rope 25 pays out and the second wire rope 26 retracts. Through the steering action of the steering guide wheel 31, when the second wire rope 26 pulls the second connecting plate 29, the lifting group 7 moves away from the wire rope retraction wheel 24, thereby realizing the reciprocating movement of the lifting group 7 on the main lifting beam 5.

[0043] Specifically, when the wire rope contracts and winds, it contracts and winds through the threaded contraction groove 27, improving the accuracy and stability when the wire rope contracts or pays out. Of course, a smooth wire rope retraction wheel 24 can be selected according to the type and size of the wire rope and the user's needs.

[0044] As Figure 6 shown, in this embodiment, preferably, the fixing assembly 30 includes a fixing column 32. A spring seat 33 is provided on the fixing column 32. An adjusting spring 34 is provided between the spring seat 33 and the fixing rod. The wire rope passes through the fixing rod and the adjusting spring 34 and is fixedly connected to the spring seat 33.

[0045] Specifically, the elastic force when the adjusting spring 34 is compressed can adjust the interval when the two wire ropes contract and pay out, eliminate the linear error of the wire rope retraction wheel 24, and ensure that the force on the contracting wire rope is greater than the force on the paying-out wire rope during the movement of the lifting group 7.

[0046] As Figure 9 shown, in this embodiment, preferably, the wire rope retraction wheel 24 includes two retraction wheels. Two symmetric threaded contraction grooves 27 are respectively located on the two retraction wheels, and the threaded contraction groove 27 can be set to be left-handed or right-handed. A wheel seat 35 is provided on the auxiliary lifting beam 6. A rotating shaft 36 is rotatably connected to the wheel seat 35. A transmission block 37 is provided on the rotating shaft 36. Both retraction wheels are connected to the transmission block 37.

[0047] Specifically, when the threaded contraction groove 27 is left-handed, the ends of the two wire ropes are respectively connected to the opposite sides of the two retraction wheels. When the threaded contraction groove 27 is right-handed, the wire rope is connected to the adjacent side of the retraction wheel, or the left and right positions of the first wire rope 25 and the second wire rope 26 are swapped.

[0048] As Figure 1 shown, in this embodiment, preferably, a tensioning mechanism is provided on the rotating main shaft 2. The tensioning mechanism includes a tensioning seat 38. Two tensioning rods 39 corresponding to the first wire rope 25 and the second wire rope 26 are slidably connected to the tensioning seat 38. A tensioning spring 40 is sleeved on the tensioning rod 39. The wire rope passes through the tensioning rod 39.

[0049] Specifically, a tension through-hole is provided at the end of the tension rod 39, and the steel wire rope passes through the tension through-hole.

[0050] Specifically, a certain tension is provided for the steel wire rope to avoid the steel wire rope from loosening. At the same time, the interval between the two steel wire ropes during contraction and wire pay-out is adjusted, and the linear error of the steel wire rope contraction wheel 24 is eliminated.

[0051] Preferably in this embodiment, a rotatable tension guide wheel is provided at the end of the tension rod 39, and the steel wire rope can be directly tensioned through the tension guide wheel.

[0052] Preferably in this embodiment, a servo motor or a manual driving device is connected to the steel wire rope contraction wheel 24.

[0053] Specifically, a servo motor and a manual driving device can also be simultaneously provided on the steel wire rope contraction wheel 24. When lifting heavy objects, it can be driven by the servo motor. When lifting light objects or when the servo motor cannot be used, it can be driven by the manual driving device.

[0054] As Figure 7 shown, preferably in this embodiment, the manual driving device includes a driving shaft 41, two ratchets 42 with opposite ratchet teeth on the driving shaft 41, and a fixed seat 43 fixedly connected to the driving shaft 41. The driving shaft 41 is connected to the rotating shaft 36 of the steel wire rope contraction wheel 24. A handle seat 44 is rotatably connected to the fixed seat 43. Two sliding sleeves 45 are slidably connected to the handle seat 44. A toggle pin 46 corresponding to the ratchet 42 is slidably connected in the sliding sleeve 45. A first spring 47 is provided between the sliding sleeve 45 and the fixed seat 43. A second spring 48 is provided between the toggle pin 46 and the sliding sleeve 45. A fork 49 is movably connected to the handle seat 44. The fork 49 is located below the sliding sleeve 45, and the lever rods on both sides thereof are respectively abutted against the two sliding sleeves 45. A connecting rod 50 is connected to the bottom end of the handle seat 44. A driving sleeve 51 is sleeved on the connecting rod 50. The driving sleeve 51 is movably connected to the connecting rod 50. The end face of the driving sleeve 51 close to the fork 49 is an inclined surface, and one side of the end is a tip. A fixing mechanism is provided between the driving sleeve 51 and the connecting rod 50. A handle sleeve 59 is connected to the driving sleeve 51.

[0055] Specifically, when manually driving the wire rope retraction wheel 24 to rotate, rotate the handle sleeve 59 to drive the drive sleeve 51 to rotate. The tip of the drive sleeve 51 contacts one of the lever rods on one side of the fork 49 during rotation and pushes the lever rod upward. The lever rod then drives the corresponding sliding sleeve 45 above, causing the sliding sleeve 45 to move upward. At the same time, the toggle pin 46 on the sliding sleeve 45 is driven, and the end of the toggle pin 46 is inserted between the ratchet teeth of the ratchet wheel 42. At this time, swing the handle sleeve 59 to drive the connecting rod 50, and then the drive shaft 41 connected to the ratchet wheel 42 can be driven to rotate, driving the wire retraction wheel to rotate;

[0056] When the tip of the drive sleeve 51 is in the middle of the two lever rods, the fork 49 will reset to a horizontal state. This state is the neutral state. At this time, swinging the handle sleeve 59 will not drive the wire rope retraction wheel to rotate. In this state, after pushing the handle sleeve 59 upward, the end of the drive sleeve 51 will drive the entire fork 49 to move upward, and the two lever rods will simultaneously push the sliding sleeve 45 upward, causing the two toggle pins 46 to contact the two ratchet wheels 42 simultaneously and respectively. After the handle sleeve 59 is pushed upward, the position of the drive sleeve 51 can be fixed through the fixing mechanism. At this time, both toggle pins 46 are in contact with the corresponding ratchet wheels 42 respectively, so that the handle sleeve 59 cannot be swung, which is the locked state.

[0057] Specifically, the two ratchet wheels 42 respectively correspond to the clockwise and counterclockwise rotations of the wire rope retraction wheel 24. As long as the handle sleeve 59 rotates 180 degrees, the original toggle pin 46 can be separated from the ratchet wheel 42, and the other toggle pin 46 can be brought into contact with the other ratchet wheel 42.

[0058] Specifically, when the lever rod descends, the sliding sleeve 45 is bounced back to its original position by the compressed second spring 48. When the toggle pin 46 toggles the ratchet wheel 42, the first spring 47 can make the toggle pin 46 retract into the sliding sleeve 45 and then extend again, so that the end of the toggle pin 46 extends into the next ratchet tooth space of the ratchet wheel 42.

[0059] Specifically, even when there is no load on the lifting unit 7, that is, in the no-load condition, the friction between the mechanisms is greater than the force generated by the first spring 47 when the toggle pin 46 swings in the reverse direction, avoiding the reverse rotation of the ratchet wheel 42 driven by the toggle pin 46 when the handle sleeve 59 swings in the reverse direction.

[0060] As Figure 7 shown, specifically, a spline shaft 52 is connected to the rotating shaft. The ratchet wheel 42 is spline-connected to the spline shaft 52, and the fixed seat 43 is connected to the spline shaft 52.

[0061] As Figure 7As shown, specifically, a waist-shaped through hole 53 is provided on the connecting rod 50, and an elastic pin 54 is provided in the waist-shaped through hole 53. The elastic pin 54 is connected to the fork 49, so that the fork 49 swings at a certain angle around the axis of the elastic pin 54 on the connecting rod 50 through the elastic pin 54, and the elastic pin 54 can move up and down in the waist-shaped through hole 53, that is, the up and down movement of the fork 49 is realized.

[0062] like Figure 1 As shown, in this example, preferably, the fixing mechanism includes a spring positioning pin 55 telescopically connected to the connecting rod 50 , and a retaining ring 56 is provided on the connecting rod 50 , and the retaining ring 56 is located below the spring positioning pin 55 .

[0063] like Figure 8 As shown, specifically, when the handle sleeve 59 swings and rotates, the drive sleeve 51 is blocked by the retaining ring 56 below to prevent the drive sleeve 51 from being separated from the connecting rod 50, and at this time the spring locating pin 55 is retracted into the interior of the connecting rod 50, and when the handle sleeve 59 is pushed upward, the bottom of the drive sleeve 51 passes over the spring locating pin 55, and the spring locating pin 55 is extended and abuts against the bottom of the drive sleeve 51, and the drive sleeve 51 can be fixed by the spring locating pin 55.

[0064] Specifically, the end of the spring locating pin 55 is an arc end. When the manual drive mechanism 8 is to be unlocked from the locked state, the handle sleeve 59 is directly rotated. During the rotation, the tip of the drive sleeve 51 presses the fork 49, so that one of the shift pins 46 is connected to the ratchet 42. At the same time, the lower end of the drive sleeve 51 squeezes the arc end of the spring locating pin 55, so that it is retracted into the connecting rod 50, thereby completing the unlocking and preventing the lifting group 7 loaded with items from moving.

[0065] like Figure 1 As shown, in this example, preferably, the counterweight mechanism 9 includes a counterweight hook located on the secondary suspension beam 6 and a fixed flange 57 located on the support column 1, and the fixed flange 57 is provided with a hanging hole corresponding to the counterweight hook.

[0066] Specifically, a counterweight block can be hung on the counterweight hook, or the counterweight hook can be directly hung on the lifting hole of the fixed flange 57. At this time, a triangular structure is formed between the supporting column 1, the rotating main shaft 2, the auxiliary hanging beam 6 and the counterweight hook. In this state, the lifting load capacity of the main hanging beam 5 is the largest, but the rotating main shaft 2 cannot rotate.

[0067] Specifically, the rotation of the rotating main shaft 2 on the supporting column 1 can be driven by a reduction motor or manually. If manual drive is adopted, its structure can be the same as the manual drive device for driving the wire rope retracting wheel 24.

[0068] like Figure 11As shown in the figure, specifically, a support frame 58 can be arranged below the auxiliary lifting beam 6 according to the height of the main lifting beam 5 on the support column 1, and the wire rope retraction wheel 24 and the manual driving device are arranged on the support frame 58, so as to reduce the height of manual operation. Guide wheels corresponding to the wire ropes are arranged on the auxiliary lifting beam 6.

[0069] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A small manual rocker crane, characterized in that: It includes a supporting column, a rotating main shaft is arranged on the supporting column, the lower end of the rotating main shaft is rotatably connected to the supporting column, a first pull rod and a second pull rod are arranged on the upper end of the rotating main shaft, a main suspension beam and an auxiliary suspension beam are arranged on the rotating main shaft, the first pull rod is connected to the main suspension beam, the second pull rod is connected to the auxiliary suspension beam, a suspension group is slidably connected to the main suspension beam, a driving mechanism is arranged on the auxiliary suspension beam, the driving mechanism drives the suspension group to slide back and forth on the main suspension beam, a counterweight mechanism is arranged on the auxiliary suspension beam, and a lifting mechanism is arranged on the suspension group.

2. The small manual rocker crane according to claim 1, characterized in that: The lifting group includes support plates located on both sides of the main lifting beam, two support wheels and two guide wheels are arranged on the support plates, the support wheels are rollingly connected to the top of the main lifting beam, and the guide wheels are rollingly connected to the bottom of the main lifting beam, two parallel connecting shafts are arranged between the two support plates, the guide wheels are rotatably connected to the connecting shafts, one of the connecting shafts is provided with a lifting ear, the lifting ear is connected to the lifting mechanism, and the two support plates are connected to the driving machine.

3. The small manual rocker crane according to claim 2, characterized in that: The support plate is provided with a support shaft corresponding to each support wheel, and the support wheel is rotatably connected to the support shaft.

4. The small manual rocker crane according to claim 2, characterized in that: The driving mechanism includes a wire rope retraction wheel and a first wire rope and a second wire rope wound on the wire rope retraction wheel, the wire rope retraction wheel is provided with two symmetrical threaded retraction grooves, when the first wire rope is rotated and wound with the wire rope retraction wheel, the second wire rope is released, when the second wire rope is rotated and wound with the wire rope retraction wheel, the first wire rope is released, a first connecting plate and a second connecting plate are respectively provided on the two support plates, the first connecting plate and the second connecting plate are both provided with a fixing component, and the fixing component on the first connecting plate is located above the fixing component on the second connecting plate, the end of the first wire rope is fixedly connected to the fixing component on the first connecting plate, a steering guide wheel is provided at the end of the main hanging beam, the second wire rope passes over the fixing component on the second connecting plate, and is fixedly connected to the fixing component on the second connecting plate after bypassing the steering guide wheel.

5. The small manual rocker crane according to claim 4, characterized in that: The fixing assembly comprises a fixing column, a spring seat is arranged on the fixing column, an adjusting spring is arranged between the spring seat and the fixing rod, and the steel wire rope passes through the fixing rod and the adjusting spring and is fixedly connected to the spring seat.

6. The small manual rocker crane according to claim 5, characterized in that: The rotating main shaft is provided with a tensioning mechanism, which includes a tensioning seat, and the tensioning seat is slidably connected with two tensioning rods corresponding to the first steel wire rope and the second steel wire rope respectively. The tensioning rod is sleeved with a tensioning spring, and the steel wire rope passes through the tensioning rod.

7. The small manual rocker crane according to claim 4, characterized in that: The wire rope retracting wheel is connected with a servo motor or a manual driving device.

8. The small manual rocker crane according to claim 7, characterized in that: The cam is provided with a plurality of springs, each of which is connected with a plurality of gears, and the plurality of gears are connected with the plurality of gears, and the plurality of gears are connected with the plurality of gears.

9. The small manual rocker crane according to claim 8, characterized in that: The fixing mechanism comprises a spring positioning pin which is telescopically connected to the connecting rod. A retaining ring is arranged on the connecting rod and is located below the spring positioning pin.

10. The small manual rocker crane according to claim 1, characterized in that: The counterweight mechanism comprises a counterweight hook located on the auxiliary suspension beam and a fixing flange located on the supporting column, and the fixing flange is provided with a hanging hole corresponding to the counterweight hook.

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