Trolley with built-in pulley block

Abstract

The built-in pulley system lifting vehicle includes a base and a boom assembly, wherein the boom assembly is hinged to the base and includes a control handle. A hook is located at the front end of the boom assembly, and a lifting cylinder is hinged between the boom assembly and the base. The advantages of this invention are: it avoids overloading during lifting. Because the lifting power is provided by a hydraulic system, even if the weight of the goods exceeds the load capacity of the hydraulic system when lifting goods of unknown weight, the hydraulic system will automatically depressurize and discharge oil, preventing the electric winch motor from burning out due to overloading. The winch also eliminates the need for a drum, motor, reducer, braking mechanism, and rope guide, resulting in a simple structure, small size, and convenient maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, in particular to a crane trolley with a built-in pulley block. Background Art

[0002] When lifting and transporting goods, existing cranes are generally fixed in one place for lifting operations, and then the goods are transported by rotating the boom or using other transportation equipment. If the boom is rotated to transport goods, it cannot adapt to long-distance transportation, and there are also high space requirements for the operating environment. If other transportation equipment is used to complete the transportation of goods, the goods need to be unloaded onto the transportation equipment first, and secondary loading and unloading are required after the transportation is completed, which consumes more labor and production costs, and the transportation efficiency is low. How to solve the above problems is a significant problem currently faced by cranes. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide an internal block and tackle trolley, which can complete the lifting and transportation of goods without rotating the boom. The internal block and tackle trolley can lift the goods and place them on the vehicle body under the boom, so that the entire internal block and tackle trolley can move together with the hoisted goods. In addition, the internal block and tackle trolley can turn on the spot, the corner radius is zero, the steering is flexible, and the requirements for the operating environment are low. While saving labor, it can also significantly improve the efficiency of the overall lifting operation.

[0004] The technical solution adopted by the present invention to solve its technical problem is: the internal pulley group lifting vehicle described in the present invention comprises a base and a boom assembly, wherein the boom assembly is hingedly installed on the base, comprises a control handle, a hook is provided at the front end of the boom assembly, and a lifting cylinder is also hinged between the boom assembly and the base, a steering mechanism is installed at the front end of the lower side of the base, a driving wheel is installed at the rear end of the lower side of the base, the driving wheel is connected with the control handle through a transmission mechanism, a hydraulic station is also provided on the base, the hydraulic station can control the steering mechanism to steer, the steering mechanism comprises two steering wheels, the steering wheels are both installed on the base through a rotating shaft, a connecting plate is fixedly installed on the rotating shaft located on the lower side of the base, a same transmission rod is hinged between the two connecting plates, a steering cylinder is hingedly installed on the lower side of the base, the piston rod end of the steering cylinder is hinged on the transmission rod, and the steering wheels on both sides can be driven to steer synchronously when the piston rod is extended or retracted. The boom assembly includes a first boom hinged on a base, a lifting cylinder is hinged between the first boom and the base, a second boom that can move along the first boom is installed in cooperation with the first boom, a limit plate is installed on the upper end of the second boom extending out of the first boom, a driving cylinder is hingedly installed between the limit plate and the first boom, a third boom that can move along the second boom is installed in cooperation with the second boom, a fourth boom that can move along the third boom is installed in cooperation with the third boom, and a hook is provided on the upper end of the fourth boom extending out of the third boom, wherein a first follower device is installed between the second boom and the third boom, and the first follower device includes a fixed device installed in the second boom A first pulley of the part, a first transmission rope is wound around the first pulley, one end of the first transmission rope is fixedly mounted on the first boom, the other end of the first transmission rope is fixedly mounted on the third boom, a second driven device is installed between the third boom and the fourth boom, the second driven device includes a second pulley fixedly mounted inside the third boom, a second transmission rope is wound around the second pulley, one end of the second transmission rope is fixedly mounted on the second boom, the other end of the second transmission rope is fixedly mounted on the fourth boom, when the driving cylinder pushes the second boom to extend out of the first boom, the third boom can synchronously extend out of the second boom, and the fourth boom can synchronously extend out of the third boom.The winch body is installed inside the boom assembly, the winch body includes a first mounting plate fixedly installed inside the boom assembly, a telescopic oil cylinder is provided on the first mounting plate, a second mounting plate is fixed on the piston rod of the telescopic oil cylinder, and the second mounting plate can move in the boom assembly, and a folding arm is also fixedly installed at the front end of the boom assembly, and a first fixed pulley and a second fixed pulley are provided on both sides of the folding arm, and a pulley group mechanism is installed on both sides of the first mounting plate and the second mounting plate, and the pulley group mechanism includes a first front wheel group installed on the side of the second mounting plate and a first rear wheel group installed on the side of the first mounting plate, wherein the number of wheels of the first rear wheel group is always one more than the number of wheels of the first front wheel group, and a lifting rope is fixedly installed on both sides of the second mounting plate, the lifting rope first passes around the first rear wheel group, then passes around the first front wheel group and then passes back to the first rear wheel group, and then extends out of the boom assembly, passes around the first fixed pulley and the second fixed pulley, and then is connected to the hook. The rotating shaft of the first rear wheel group is hingedly installed on the boom assembly, and two groups of locking and positioning devices are provided between the telescopic cylinder and the boom assembly, each group of locking and positioning devices includes a cylinder positioning block fixedly installed on the telescopic cylinder, a reinforcement plate is provided on the boom assembly corresponding to the position of the cylinder positioning block, and a pressure block is matched with the inner thread of the reinforcement plate. The pressure block can be rotated to press the cylinder positioning block, and a hexagonal bolt is installed in the pressure block. The cylinder positioning block is provided with a screw hole matching the hexagonal bolt, and a first pressure plate is provided between the end of the hexagonal bolt and the reinforcement plate, and the hexagonal bolt can be rotated into the cylinder positioning block to fix the telescopic cylinder to the boom assembly. A second front wheel group and a second rear wheel group are provided between the first front wheel group and the first rear wheel group, wherein the second front wheel group is mounted on the second mounting plate, and the second rear wheel group is mounted on the first mounting plate, the second front wheel group and the second rear wheel group have the same number of wheels, and the wheel diameters of the second front wheel group and the second rear wheel group are both smaller than the wheel diameters of the first front wheel group and the first rear wheel group, the lifting rope passes around the second rear wheel group, the second front wheel group, the first rear wheel group and the first front wheel group in sequence, and then passes back to the first rear wheel group, and then extends out of the boom assembly, passes around the first fixed pulley and the second fixed pulley, and is connected to the lifting hook.The lifting rope of the pulley block mechanism on both sides is the same, and the middle position of the lifting rope is fixed to the bottom of the second mounting plate by a fastening device. The fastening device includes a rope rack, a rope pressing block, an inclined iron and a fastening bolt. A mounting groove matched with the fastening device is also provided at the bottom of the second mounting plate, wherein one end of the mounting groove is a first inclined surface matched with the inclined iron, and the inclined iron is installed with the first inclined surface by a fastening bolt, and the rope rack is fixedly installed at the other end of the mounting groove, and a rope pressing block is provided between the rope rack and the inclined iron, and two sides of the rope rack are provided with a first inclined surface matched with the lifting A first through hole for matching with the rope, a convex block is provided at the middle position of one end of the rope rack near the rope pressing block, a second through hole for matching with the lifting rope is provided on the convex block, the second through hole is arranged perpendicular to the first through hole, a pressing groove for matching with the second through hole is provided at one end of the rope pressing block near the rope rack, a through groove for matching with the convex block is provided between the pressing grooves, a second inclined surface for matching with the inclined iron is provided at one end of the rope pressing block near the inclined iron, when the fastening bolt is rotated to press the inclined iron, the pressing groove on the rope pressing block can press and fix the lifting rope in the second through hole. The lifting ropes of the pulley block mechanisms on both sides are the same, a third pulley arranged horizontally is installed at the bottom of the second mounting plate, and the lifting rope is wound around the third pulley. The hook includes a hook body, which is installed in the first counterweight, and a second counterweight is installed on the first counterweight by bolts. A receiving plate is provided between the first counterweight and the second counterweight, and a gap is left between the receiving plate and the second counterweight. Three blocks are installed at the bottom of the second counterweight, and a wedge is provided between the two blocks. A second pressure plate is fixedly installed at the bottom of the block and the wedge, and a third through hole matching with the lifting rope is also provided on the second counterweight, and the lifting rope can be fixed to the second counterweight by the wedge when passing through the third through hole. The transmission mechanism includes a vertical shaft installed on the control handle, a first gear is installed at the bottom of the vertical shaft, a first rack meshing with the first gear is installed on the base, a second gear is installed on the rotating shaft of the driving wheel, and a second rack meshing with the second gear is installed on the base, wherein the first rack and the second rack are fixedly connected, and a guide plate matching with the first rack and the second rack is also provided on the base. The positive effects of the present invention are: the internal pulley block trolley described in the present invention can complete the lifting and transportation of goods without rotating the boom, the overall internal pulley block trolley can move together with the hoisted goods, the steering range during movement is large and flexible, there are no special requirements for the operating environment, and the labor demand is reduced while the efficiency of the overall lifting operation can be significantly improved. The driven device installed between the multi-stage booms can ensure that all booms are fully extended under the drive of a driving cylinder, simplifying the structural setting of the boom, and both sides of the winch inside the boom are provided with multi-stage wheel groups, on which the hoisting rope is wound back and forth. Under the premise that the hoisting cylinder has the same extension and retraction stroke, the hoisting rope can be controlled to be extended and retracted for a longer distance, thereby greatly improving the scope of application of the overall device.The main components of the hoist of the built-in pulley block hoisting vehicle are distributed along the length direction. Its overall shape is slender, which is convenient for installation inside the boom, does not occupy additional space outside the boom, and can make the crane body have enough space to hold the hoisted goods, so that the crane has the dual functions of hoisting and transportation, and is particularly suitable for small and medium-sized cranes. It uses a hydraulic system to achieve braking, does not require brake pads, can fundamentally solve the problem that the brake pads are easy to wear and need to be replaced frequently during use, and can also greatly improve the safety of hoisting operations. Its main components are hydraulic cylinders and pulley blocks, with simple structure, low processing and manufacturing costs, and long service life. It has the advantage of avoiding overweight lifting. Since its lifting power is provided by the hydraulic system, when hoisting goods of unknown weight, even if the weight of the goods exceeds the load capacity of the hydraulic system, the hydraulic system will automatically release pressure and discharge oil, and there will be no situation where the motor of the electric hoist is burned when the crane is overloaded. The hoist also omits mechanisms such as the drum, motor, reducer, brake mechanism and rope arrangement device, and has a simple structure, small size and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front view of the present invention; Figure 3 yes Figure 2 Right view of; Figure 4 yes Figure 2 A magnified view of the local view in the A direction; Figure 5 It is a schematic diagram of the structure of the internal section of the boom; Figure 6 yes Figure 5 An enlarged view of the BB section view; Figure 7 It is a structural schematic diagram of another cut-away method inside the boom; Figure 8 It is a structural diagram of the winch; Fig. 9 yes Figure 8 A partial enlarged view of middle II; Fig.10 Figure 8 A partial enlarged view of middle III; Fig.11 It is a structural schematic diagram of a locking and positioning device; Fig.12 is a schematic diagram of the three-dimensional structure of the fastening device; Fig.13 It is a schematic diagram of the structure of the rope rack; Fig.14 It is a schematic diagram of the structure in which the same suspension rope is installed on the third pulley; Fig.15 It is a schematic diagram of the structure of the hook; Fig.16 yes Fig.15 Middle CC section view; Fig.17 yes Figure 1 A partial enlarged view of middle I; Fig.18 This is a schematic diagram of the winding of the hoisting rope on the winch, where Fig.18As shown in B, the pulley assembly mechanism only includes a first front wheel assembly (431) and a first rear wheel assembly (411); Fig.18 As shown in A, the wheel set mechanism includes a first front wheel set (431), a first rear wheel set (411), a second rear wheel set (412) and a second front wheel set (432); Fig.19 It is a structural diagram of the coordinated installation of the rope rack, the rope pressing block and the inclined iron; Fig. 20 It is a schematic diagram of the structure of the inclined iron; Fig.21 It is a structural schematic diagram of the rope pressing block; Fig. 22 It is a schematic diagram of the distribution of steel wire ropes in a pulley assembly mechanism including only a first front wheel assembly (431) and a first rear wheel assembly (411); Fig.23 The invention is a schematic diagram of the distribution of steel wire ropes of a pulley assembly mechanism including a first front wheel assembly (431), a first rear wheel assembly (411), a second rear wheel assembly (412) and a second front wheel assembly (432).

[0006] In the figure, 1 base 11 counterweight 12 hydraulic station 13 steering mechanism 131 steering wheel 132 rotating shaft 133 connecting plate 134 transmission rod 135 steering cylinder 136 piston rod 14 driving wheel 15 lifting cylinder 2 control handle 21 vertical shaft 22 first gear 23 first rack 24 second gear 25 second rack 26 guide plate 3 boom assembly 31 first boom 32 second boom 33 third boom 34 fourth boom 35 driving cylinder 36 limiting plate 321 first pulley 322 first transmission rope 331 second pulley 332 second transmission rope 4 winch body 41 first mounting plate 42 telescopic cylinder 43 second mounting plate 44 folding arm 45 second fixed pulley 46 lifting rope 47 first fixed pulley 431 first front wheel group 411 first rear wheel group 432 second front wheel group 412 second rear wheel group 5 hook 51 hook body 52 first counterweight iron 53 second counterweight iron 54 receiving plate 55 stopper 56 wedge iron 57 second pressing plate 58 third through hole 61 rope rack 62 rope pressing block 63 inclined iron 64 fastening bolt 65 installation groove 66 first inclined surface 67 third pulley 611 first through hole 612 protrusion 613 second through hole 621 pressing groove 622 second inclined surface 623 through groove 71 oil cylinder positioning block 72 reinforcing plate 73 pressing block 74 hexagonal bolt 75 first pressing plate DETAILED DESCRIPTION

[0007] The invention provides a trolley with an internal pulley block, such as Figure 1As shown, it includes a base 1, a control handle 2 and a boom assembly 3. The boom assembly 3 is hingedly mounted on the base 1, and a hook 5 is provided at the front end of the boom assembly 3. A lifting cylinder 15 is also hinged between the boom assembly 3 and the base 1. The lifting cylinder 15 can push the boom assembly 3 and the hook 5 to swing and lift the goods. A steering mechanism 13 is installed at the front end of the lower side of the base 1. A driving wheel 14 is installed at the rear end of the lower side of the base 1. The driving wheel 14 can be an existing electric vehicle motor and a rubber tire is installed on the periphery. The driving wheel 14 is connected to the control handle 2 through a transmission mechanism. A counterweight 11 and a hydraulic station 12 are also provided on the base 1. The hydraulic station 12 can control the steering mechanism 13 to steer, and the control handle 2 can control the driving wheel 14 to steer. The counterweight 11 can lower the center of gravity of the overall built-in pulley block trolley to prevent the device from tipping over when lifting goods. The hydraulic station 12 is provided with corresponding control switches, valves and oil circuits, which can control the extension and contraction of each oil cylinder to complete the lifting of goods and the steering of the steering mechanism 13 through the control switch. The hydraulic control system for controlling the hydraulic cylinder is an existing hydraulic system.

[0008] like Figure 4 As shown, the steering mechanism 13 includes two steering wheels 131, and the steering wheels 131 are installed on the base 1 through a rotating shaft 132. A connecting plate 133 is fixedly installed on the rotating shaft 132 located at the lower side of the base 1, and a same transmission rod 134 is hinged between the two connecting plates 133, and the two ends of the transmission rod 134 are respectively hinged to the two connecting plates 133. A steering cylinder 135 is hingedly installed on the lower side of the base 1, and the end of the piston rod 136 of the steering cylinder 135 is hinged on the transmission rod 134. When the piston rod 136 is extended and retracted, the connecting plates 133 and the rotating shaft 132 on both sides can be driven to rotate in the same direction and at the same angle through the transmission rod 134, that is, the steering wheels 131 on both sides can be driven to steer synchronously. After the boom assembly 3 lifts the cargo, it can be placed on the front end of the base 1. The steering mechanism 13 and the driving wheel 14 can be adjusted to rotate 90 degrees, so that the overall built-in pulley trolley can be moved horizontally along the width direction of the base 1, and the steering and movement are more flexible, which greatly improves the efficiency of cargo lifting and transportation. The steering cylinder 135 can also be an existing cylinder or electric push rod, but the cylinder and hydraulic system are more suitable for the design requirements of the present invention.

[0009] In order to simplify the driving structure of the boom assembly 3, a single oil cylinder can be used to achieve synchronous extension and retraction of multiple booms, such as Figure 5 , Figure 6 and Figure 7As shown, the boom assembly 3 includes a first boom 31 hinged on the base 1, and a lifting cylinder 15 is hinged between the first boom 31 and the base 1. A second boom 32 that can move along the first boom 31 is installed in cooperation with the first boom 31. A limit plate 36 is installed on the upper end of the second boom 32 extending out of the first boom 31, and a driving cylinder 35 is hingedly installed between the limit plate 36 and the first boom 31. The cylinder body of the driving cylinder 35 is hinged to the first boom 31, and its piston rod is hinged to the limit plate 36. When the driving cylinder 35 is extended or retracted, it can synchronously drive the second boom 32 to telescopically move relative to the first boom 31.

[0010] like Figure 5 As shown, a third arm 33 is installed inside the second arm 32 and can move along it, and a fourth arm 34 is installed inside the third arm 33 and can move along it. The upper end of the fourth arm 34 extending out of the third arm 33 is provided with a hook 5, wherein a first driven device is installed between the second arm 32 and the third arm 33, as shown in FIG. Figure 5 and Figure 6 As shown, the first driven device includes a first pulley 321 fixedly mounted inside the second boom 32, a first transmission rope 322 is wound around the first pulley 321, one end of the first transmission rope 322 is fixedly mounted on the first boom 31, and the other end of the first transmission rope 322 is fixedly mounted on the third boom 33.

[0011] like Figure 6 and Figure 7 As shown, a second driven device is installed between the third boom 33 and the fourth boom 34, and the second driven device includes a second pulley 331 fixedly installed inside the third boom 33, and a second transmission rope 332 is wound around the second pulley 331, one end of the second transmission rope 332 is fixedly installed on the second boom 32, and the other end of the second transmission rope 332 is fixedly installed on the fourth boom 34.

[0012] Analyze the action linkage relationship of the first driven device between the second arm 32 and the third arm 33: when the driving cylinder 35 pushes the second arm 32 to extend relative to the first arm 31, the first arm 31 is fixed and motionless. Since the first pulley 321 is fixedly mounted on the second arm 32, the first pulley 321 also extends and moves relative to the first arm 31. One end of the first transmission rope 322 wound on the first pulley 321 is fixedly mounted on the first arm 31 and cannot move, and the other end is fixedly mounted on the third arm 33. Since the overall length of the first transmission rope 322 remains unchanged, when the first pulley 321 extends relative to the first arm 31, it will drive the third arm 33 to extend relative to the second arm 32.

[0013] Similarly, the second driven device between the third boom 33 and the fourth boom 34 is analyzed. Since the third boom 33 extends relative to the second boom 32, the second pulley 331 fixedly mounted on the third boom 33 also extends and moves relative to the second boom 32. One end of the second transmission rope 332 wound around the second pulley 331 is fixedly mounted on the second boom 32, and the other end is fixedly mounted on the fourth boom 34. Since the overall length of the second transmission rope 332 remains unchanged, when the second pulley 331 extends relative to the second boom 32, it will drive the fourth boom 34 to extend relative to the third boom 33. That is, when the driving cylinder 35 pushes the second boom 32 to extend from the first boom 31, the third boom 33 can extend from the second boom 32 synchronously, and the fourth boom 34 can extend from the third boom 33 synchronously. One cylinder can push the multi-stage boom to extend and retract.

[0014] A winch body 4 for driving the lifting rope 46 to extend and retract is installed inside the boom assembly 3. Figure 8 , Fig. 9 and Fig.10 As shown, the hoist body 4 includes a first mounting plate 41 fixedly mounted inside the boom assembly 3, a telescopic oil cylinder 42 is provided on the first mounting plate 41, a second mounting plate 43 is fixed on the piston rod of the telescopic oil cylinder 42, and the second mounting plate 43 can move inside the boom assembly 3. A folding arm 44 is also fixedly mounted at the front end of the boom assembly 3, and a first fixed pulley 47 and a second fixed pulley 45 are provided on both sides of the folding arm 44. The lifting rope 46 extending from the inside of the hoist body 4 passes around the first fixed pulley 47 and the second fixed pulley 45 and is connected to the hook 5, wherein the folding arm 44 can be installed at the front end of the fourth boom 34, that is, the frontmost position of the boom assembly 3.

[0015] Pulley block mechanisms are installed on both sides of the first mounting plate 41 and the second mounting plate 43. The pulley block mechanisms include a first front wheel group 431 installed on the side of the second mounting plate 43 and a first rear wheel group 411 installed on the side of the first mounting plate 41, wherein the number of wheels of the first rear wheel group 411 is always one more than the number of wheels of the first front wheel group 431. Suspension ropes 46 are fixedly installed on both sides of the second mounting plate 43. The suspension ropes 46 are wound between the first front wheel group 431 and the first rear wheel group 411. Corresponding to the position of the wheel group, a guard frame matching the same is also provided on the mounting plate to prevent the suspension ropes 46 from falling off. The number of wheels of the first front wheel group 431 is at least one, and the number of wheels of the first rear wheel group 411 is at least two. Fig.18 As shown in FIG. 1B , the lifting rope 46 first passes around the first rear wheel set 411, then passes around the first front wheel set 431 and then passes back to the first rear wheel set 411, then extends out of the boom assembly 3, passes around the first fixed pulley 47 and the second fixed pulley 45, and then is connected to the hook 5. The purpose of the first rear wheel set 411 always having one more wheel than the first front wheel set 431 is to enable the lifting rope 46 to pass back to the first rear wheel set 411 and then extend out from the inside of the boom assembly 3. Fig. 9 and 10 As shown, the first front wheel group 431 has three wheels, the first rear wheel group 411 has four wheels, and the ratio of the moving distance of the telescopic cylinder 42 to the telescopic distance of the suspension rope 46 is related to the number of wheels. When the moving distance of the telescopic cylinder 42 is the same, the more wheels there are, the longer the telescopic distance of the suspension rope 46. The arrangement of the winch body 4 inside the boom assembly 3 can minimize the telescopic distance of the telescopic cylinder 42 while ensuring that the telescopic length of the suspension rope 46 is sufficient, and can also reduce the length setting of the entire boom assembly 3.

[0016] In order to accurately install the hoist body 4 in the boom assembly 3 and avoid shaking when lifting goods, Fig.11 As shown, the rotating shaft of the first rear wheel group 411 is hingedly mounted on the boom assembly 3, and a mounting hole matching the rotating shaft is provided on the side wall of the boom assembly 3. Two sets of locking and positioning devices are also provided between the telescopic cylinder 42 and the boom assembly 3, and each set of locking and positioning devices includes a cylinder positioning block 71 fixedly mounted on the telescopic cylinder 42. Corresponding to the position of the cylinder positioning block 71, a reinforcing plate 72 is provided on the boom assembly 3, and a pressure block 73 is matched with the internal thread of the reinforcing plate 72. The pressure block 73 can be rotated to press the cylinder positioning block 71, and a light hole is provided in the pressure block 73, and a hexagonal bolt 74 is installed in the light hole. A screw hole matching the hexagonal bolt 74 is provided on the cylinder positioning block 71, and a first pressure plate 75 is provided between the end of the hexagonal bolt 74 and the reinforcing plate 72. The hexagonal bolt 74 can be rotated into the cylinder positioning block 71 to fix the telescopic cylinder 42 to the boom assembly 3.

[0017] During installation, first extend the winch body 4 into the boom assembly 3, so that the shaft of the first rear wheel group 411 is hinged on the boom assembly 3, and then screw the pressure blocks 73 into the reinforcement plates 72 on both sides of the boom assembly 3, so that the pressure blocks 73 on both sides press the cylinder positioning block 71, and adjust the positions of the pressure blocks 73 on both sides so that the telescopic cylinder 42 is located in the middle position of the boom assembly 3. At this time, one person is required to adjust at the back and one person is required to check whether it has been adjusted at the front. After the adjustment is completed, screw the hexagonal bolt 74 into the light hole of the pressure block 73 and the screw hole of the cylinder positioning block 71 to position the pressure block 73 and complete the fixation between the telescopic cylinder 42 and the boom assembly 3. The overall installation operation is easy to implement and the positioning is accurate, which can ensure that the overall winch body 4 will not shake when lifting goods. The top of the pressure block 73 is provided with an inner hexagon to facilitate manual screwing of the pressure block 73 into the reinforcement plate 72.

[0018] In order to further increase the telescopic length of the control rope 46 and reduce the overall width of the boom assembly 3 while keeping the maximum telescopic length of the telescopic cylinder 42 unchanged, a second front wheel group 432 and a second rear wheel group 412 are provided between the first front wheel group 431 and the first rear wheel group 411. Fig.10 As shown, the second front wheel set 432 is mounted on the second mounting plate 43, as shown in FIG. Fig. 9 As shown, the second rear wheel set 412 is mounted on the first mounting plate 41, and the second front wheel set 432 and the second rear wheel set 412 have the same number of wheels. In order to ensure that the suspension ropes 46 wound on each wheel set do not affect each other, the wheel diameters of the second front wheel set 432 and the second rear wheel set 412 are smaller than the wheel diameters of the first front wheel set 431 and the first rear wheel set 411. By adding a second front wheel set 432 and a second rear wheel set 412 with the same number of wheels as the first front wheel set 431, the suspension rope 46 can increase the telescopic distance several times under the premise that the telescopic cylinder 42 moves the same distance. Fig.18 As shown in FIG. 1A, the lifting rope 46 is wound around the second rear wheel group 412, the second front wheel group 432, the first rear wheel group 411 and the first front wheel group 431 in sequence, and then wound back to the first rear wheel group 411, and then extended out of the boom assembly 3 to pass through the first fixed pulley 47 and the second fixed pulley 45, and then connected to the hook 5. The lifting rope 46 is first wound between the second rear wheel group 412 and the second front wheel group 432, and then wound around the first wheel group after winding the number of wheels on the second wheel group. The winding sequence between the second rear wheel group 412 and the second front wheel group 432 is from the outside to the inside, and the winding sequence between the first front wheel group 431 and the first rear wheel group 411 is from the inside to the outside, so as to enable the lifting rope 46 wound out of the first rear wheel group 411 to extend out of the boom assembly 3 from the outside of the wheel group, so as to avoid the situation of entanglement and obstruction between each section of the lifting rope 46. When there are only the first front wheel group 431 and the first rear wheel group 411 on the winch body 4, the winding order of the lifting rope 46 on the first front wheel group 431 and the first rear wheel group 411 is from the inside to the outside, so that the lifting rope 46 wound by the first rear wheel group 411 extends out of the boom assembly 3 from the outside of the wheel group.

[0019] Example of pulley mechanism:

[0020] 1. The wire rope distribution example of the pulley block mechanism including only the first front wheel group 431 and the first rear wheel group 411 is as follows: Fig. 22 As shown, the first rear wheel group 411 is composed of three pulleys, B1, B2 and B3, and the first front wheel group 431 is composed of two pulleys, F1 and F2, and the distribution pattern of the wire ropes is as follows: the free end of the wire rope 46 extends backward from 43, first bypasses the innermost B1, then bypasses the innermost F1, then bypasses B2, then bypasses F2, and finally bypasses B3, and after bypassing B3, extends forward outside the boom 3.

[0021] 2. When the pulley assembly includes the first front wheel assembly 431, the first rear wheel assembly 411, the second rear wheel assembly 412 and the second front wheel assembly 432, the wire rope distribution example is as follows: Fig.23 As shown, the first rear wheel group 411 is composed of three pulleys B1, B2 and B3, the first front wheel group 431 is composed of two pulleys F1 and F2, the second rear wheel group 412 is composed of two pulleys b1 and b2, and the second front wheel group 432 is composed of two pulleys f1 and f2.

[0022] The wire rope distribution law is divided into the first winding stage and the second winding stage:

[0023] First winding stage: the free end of the steel wire rope 46 extends backward from the second mounting plate 43, first around the outermost b1, then around the outermost f1, then around b2, then around f2 and extending toward B1.

[0024] The second winding stage: the wire rope from f2 first goes around the innermost B1, then around the innermost F1, then around B2, then around F2, and finally around B3, and after going around B3, it extends forward outside the boom 3.

[0025] The lifting ropes 46 of the pulley block mechanisms on both sides are two ropes respectively fixedly mounted on the second mounting plate 43. For the convenience of manufacturing and installation, the lifting ropes 46 of the pulley block mechanisms on both sides are the same rope. The middle part of the lifting rope 46 is fixed to the bottom of the second mounting plate 43 by a fastening device. The two sections of the lifting ropes 46 located at the pulley block mechanisms on both sides are equal in length and are both connected to the hook 5, which can ensure that the pulley block mechanisms on both sides are subjected to the same pulling force when lifting goods. Fig.12 As shown, the fastening device includes a rope rack 61, a rope pressing block 62, an inclined iron 63 and a fastening bolt 64. A mounting groove 65 matching the fastening device is also provided at the bottom of the second mounting plate 43, wherein one end of the mounting groove 65 is a first inclined surface 66 matching the inclined iron 63, and the inclined iron 63 is mounted in cooperation with the first inclined surface 66 through the fastening bolt 64. The rope rack 61 is fixedly installed at the other end of the mounting groove 65, and a rope pressing block 62 is provided between the rope rack 61 and the inclined iron 63. Fig.13As shown, first through holes 611 cooperating with the suspension rope 46 are provided on both sides of the rope rack 61, a protrusion 612 is provided at the middle position of the rope rack 61 near one end of the rope pressing block 62, a second through hole 613 cooperating with the suspension rope 46 is provided on the protrusion 612, the second through hole 613 is vertically arranged with the first through hole 611, and the middle position of the suspension rope 46 is located in the protrusion 612. A pressing groove 621 cooperating with the second through hole 613 is provided at one end of the rope pressing block 62 close to the rope rack 61, and a through groove 623 cooperating with the protrusion 612 is provided between the pressing grooves 621. A second inclined surface 622 cooperating with the inclined iron 63 is provided at one end of the rope pressing block 62 close to the inclined iron 63. When the fastening bolt 64 is rotated to press the inclined iron 63, the inclined iron 63 moving into the mounting groove 65 can push the rope pressing block 62 to move and press the rope rack 61, so that the pressing groove 621 on the rope pressing block 62 presses and fixes the suspension rope 46 in the second through hole 613, thereby completing the fixation of the suspension rope 46 and the second mounting plate 43.

[0026] Under the premise that the lifting rope 46 of the pulley block mechanism on both sides is the same, if the internal pulley block trolley is parked at a fixed position to lift the rows of goods, when the goods are far away from the internal pulley block trolley, it is necessary to lengthen the lifting rope 46 and move the hook 5 to the position of the goods. However, when lifting the goods, the lifting ropes 46 on both sides are in an inclined state and the forces they are subjected to are unbalanced. After long-term use, the installation strength of the lifting ropes 46 on both sides will be seriously affected, and even fall off. In order to avoid the above situation, Fig.14 As shown, a horizontally arranged third pulley 67 is installed at the bottom of the second mounting plate 43, and the sling rope 46 is wound around the third pulley 67. When the sling rope 46 is in an inclined state to lift the goods, since the sling ropes 46 on both sides are the same and can rotate with the third pulley 67, the sling ropes 46 on both sides can always be of equal length and bear the same tension.

[0027] Furthermore, if Fig.15 and Fig.16 As shown, the hook 5 includes a hook body 51, which is installed in the first counterweight 52. The second counterweight 53 is installed on the first counterweight 52 by bolts. A receiving plate 54 is provided between the first counterweight 52 and the second counterweight 53. A gap is left between the receiving plate 54 and the second counterweight 53. Three blocks 55 are installed at the bottom of the second counterweight 53. A wedge 56 is provided between the two blocks 55. A second pressure plate 57 is fixedly installed at the bottom of the block 55 and the wedge 56. A third through hole 58 that cooperates with the lifting rope 46 is also opened on the second counterweight 53. The lifting rope 46 passes through the third through hole 58 and can be fixed to the second counterweight 53 by the wedge 56.

[0028] The transmission mechanism between the driving wheel 14 and the control handle 2 can be an existing screw nut transmission mechanism or a belt transmission wheel transmission mechanism. In order to facilitate installation and precise control, Fig.17 As shown, the transmission mechanism includes a vertical shaft 21 installed on the control handle 2, a first gear 22 is installed at the bottom of the vertical shaft 21, a first rack 23 meshing with the first gear 22 is installed on the base 1, a second gear 24 is installed on the rotating shaft of the driving wheel 14, a second rack 25 meshing with the second gear 24 is installed on the base 1, wherein the first rack 23 and the second rack 25 are fixedly connected, and a guide plate 26 matching the first rack 23 and the second rack 25 is also provided on the base 1. Rotating the control handle 2 can drive the driving wheel 14 to rotate synchronously through the vertical shaft 21, the first gear 22, the first rack 23, the second rack 25 and the second gear 24 in sequence, wherein the transmission mechanism can also be replaced by an existing electronic steering gear.

[0029] The technical solution of the present invention is not limited to the scope of the embodiments described in the present invention. The technical contents not described in detail in the present invention are all well-known technologies.

Claims

1. A trolley with an internal pulley block, comprising a base (1) and a boom assembly (3), wherein the boom assembly (3) is hingedly mounted on the base (1), characterized in that: The invention comprises a control handle (2), a hook (5) is provided at the front end of a boom assembly (3), a lifting cylinder (15) is hingedly connected between the boom assembly (3) and a base (1), a steering mechanism (13) is installed at the front end of the lower side of the base (1), a driving wheel (14) is installed at the rear end of the lower side of the base (1), the driving wheel (14) is connected to the control handle (2) through a transmission mechanism, a hydraulic station (12) is also provided on the base (1), the hydraulic station (12) can control the steering mechanism (13) to steer, the steering mechanism (13) comprises two steering wheels (131), the steering wheel (131) Both are mounted on the base (1) via a rotating shaft (132); a connecting plate (133) is fixedly mounted on the rotating shaft (132) located at the lower side of the base (1); a common transmission rod (134) is hingedly connected between the two connecting plates (133); a steering cylinder (135) is hingedly mounted on the lower side of the base (1); an end of a piston rod (136) of the steering cylinder (135) is hingedly connected to the transmission rod (134); when the piston rod (136) is extended or retracted, it can drive the steering wheels (131) on both sides to perform synchronous steering; a winch body (4) is mounted inside the boom assembly (3); the winch body (4) The invention comprises a first mounting plate (41) fixedly mounted inside a boom assembly (3), a telescopic oil cylinder (42) being arranged on the first mounting plate (41), a second mounting plate (43) being fixed on the piston rod of the telescopic oil cylinder (42), the second mounting plate (43) being movable inside the boom assembly (3), a folding arm (44) being fixedly mounted on the front end of the boom assembly (3), a first fixed pulley (47) and a second fixed pulley (45) being arranged on both sides of the folding arm (44), a pulley block mechanism being installed on both sides of the first mounting plate (41) and the second mounting plate (43), the pulley block mechanism comprising a pulley block mechanism installed on the second mounting plate ( A first front wheel group (431) is mounted on the side of the first mounting plate (43) and a first rear wheel group (411) is mounted on the side of the first mounting plate (41), wherein the number of wheels of the first rear wheel group (411) is always one more than the number of wheels of the first front wheel group (431), and a lifting rope (46) is fixedly mounted on both sides of the second mounting plate (43), wherein the lifting rope (46) first passes around the first rear wheel group (411), then passes around the first front wheel group (431), and then passes back to the first rear wheel group (411), and then extends out of the boom assembly (3), passes around the first fixed pulley (47) and the second fixed pulley (45), and then is connected to the hook (5);The lifting rope (46) of the pulley block mechanisms on both sides is the same. The middle position of the lifting rope (46) is fixed to the bottom of the second mounting plate (43) by a fastening device. The fastening device includes a rope rack (61), a rope pressing block (62), an inclined iron (63) and a fastening bolt (64). A mounting groove (65) matching with the fastening device is also provided at the bottom of the second mounting plate (43). One end of the mounting groove (65) is a first inclined surface (66) matching with the inclined iron (63). The inclined iron (63) is mounted with the first inclined surface (66) by the fastening bolt (64). The rope rack (61) is fixedly installed at the other end of the mounting groove (65). A rope pressing block (62) is provided between the rope rack (61) and the inclined iron (63). First through holes (611) matching with the lifting rope (46) are provided on both sides of the rope rack (61). A convex block (612) is provided at the middle position of the rope rack (61) near one end of the rope pressing block (62). A second through hole (613) is provided on the rope holder (612) and is matched with the suspension rope (46). The second through hole (613) is arranged perpendicular to the first through hole (611). A pressing groove (621) is provided on one end of the rope pressing block (62) close to the rope holder (61) and is matched with the second through hole (613). A through groove (623) is provided between the pressing grooves (621) and is matched with the protrusion (612). The rope pressing block (62) is provided on one end close to the inclined iron (63). There is a second inclined surface (622) matched with the inclined iron (63), and when the fastening bolt (64) is rotated to press the inclined iron (63), the pressing groove (621) on the rope pressing block (62) can press and fix the suspension rope (46) in the second through hole (613); the suspension rope (46) of the pulley block mechanisms on both sides is the same, and a third pulley (67) arranged horizontally is installed at the bottom of the second mounting plate (43), and the suspension rope (46) is wound around the third pulley (67). ; 2. The internal pulley trolley according to claim 1, characterized in that: The boom assembly (3) comprises a first boom (31) hinged on a base (1), a lifting cylinder (15) being hinged between the first boom (31) and the base (1), a second boom (32) being mounted inside the first boom (31) and being movable along the first boom, a limiting plate (36) being mounted on the upper end of the second boom (32) extending out of the first boom (31), a driving cylinder (35) being hingedly mounted between the limiting plate (36) and the first boom (31), a third boom (33) being mounted inside the second boom (32) and being movable along the second boom, a fourth boom (34) being mounted inside the third boom (33) and being movable along the third boom, a hook (5) being mounted on the upper end of the fourth boom (34) extending out of the third boom (33), wherein a first driven device is mounted between the second boom (32) and the third boom (33), the first driven device comprising a first pulley ( 321), a first transmission rope (322) is wound around the first pulley (321), one end of the first transmission rope (322) is fixedly mounted on the first boom (31), the other end of the first transmission rope (322) is fixedly mounted on the third boom (33), a second follower device is installed between the third boom (33) and the fourth boom (34), the second follower device comprises a second pulley (331) fixedly mounted inside the third boom (33), a second transmission rope (332) is wound around the second pulley (331), one end of the second transmission rope (332) is fixedly mounted on the second boom (32), the other end of the second transmission rope (332) is fixedly mounted on the fourth boom (34), when the driving cylinder (35) pushes the second boom (32) to extend out of the first boom (31), the third boom (33) can synchronously extend out of the second boom (32), and the fourth boom (34) can synchronously extend out of the third boom (33).

3. The internal pulley trolley according to claim 1, characterized in that: The rotating shaft of the first rear wheel assembly (411) is hingedly mounted on the boom assembly (3), and two sets of locking and positioning devices are provided between the telescopic oil cylinder (42) and the boom assembly (3), each set of locking and positioning devices comprising an oil cylinder positioning block (71) fixedly mounted on the telescopic oil cylinder (42), a reinforcing plate (72) on the boom assembly (3) corresponding to the position of the oil cylinder positioning block (71), and a pressure block (73) is matched with the internal thread of the reinforcing plate (72), The pressing block (73) can be rotated to press the oil cylinder positioning block (71), a hexagonal bolt (74) is installed in the pressing block (73), a screw hole matching the hexagonal bolt (74) is opened on the oil cylinder positioning block (71), a first pressing plate (75) is provided between the end of the hexagonal bolt (74) and the reinforcing plate (72), and the hexagonal bolt (74) can be rotated into the oil cylinder positioning block (71) to fix the telescopic oil cylinder (42) and the boom assembly (3).

4. The internal pulley trolley according to claim 1, characterized in that: A second front wheel group (432) and a second rear wheel group (412) are provided between the first front wheel group (431) and the first rear wheel group (411), wherein the second front wheel group (432) is mounted on the second mounting plate (43), and the second rear wheel group (412) is mounted on the first mounting plate (41). The second front wheel group (432) and the second rear wheel group (412) have the same number of wheels, and the wheel diameters of the second front wheel group (432) and the second rear wheel group (412) are both smaller than the wheel diameters of the first front wheel group (431) and the first rear wheel group (411). The lifting rope (46) passes through the second rear wheel group (412), the second front wheel group (432), the first rear wheel group (411) and the first front wheel group (431) in sequence, and then passes back to the first rear wheel group (411), and then extends out of the boom assembly (3), passes through the first fixed pulley (47) and the second fixed pulley (45), and is connected to the lifting hook (5).

5. The internal pulley trolley according to claim 1, characterized in that: The hook (5) comprises a hook body (51), the hook body (51) being mounted in a first counterweight (52), a second counterweight (53) being mounted on the first counterweight (52) by means of bolts, a receiving plate (54) being arranged between the first counterweight (52) and the second counterweight (53), a gap being left between the receiving plate (54) and the second counterweight (53), three stoppers (55) being mounted on the bottom of the second counterweight (53), a wedge (56) being arranged between the two stoppers (55), a second pressing plate (57) being fixedly mounted on the bottoms of the stoppers (55) and the wedges (56), and a third through hole (58) being arranged on the second counterweight (53) to match the lifting rope (46), the lifting rope (46) being fixed to the second counterweight (53) by the wedges (56) after passing through the third through hole (58).

6. The internal pulley trolley according to claim 1, characterized in that: The transmission mechanism comprises a vertical shaft (21) mounted on the control handle (2), a first gear (22) being mounted at the bottom of the vertical shaft (21), a first rack (23) being mounted on the base (1) and meshing with the first gear (22), a second gear (24) being mounted on the rotating shaft of the driving wheel (14), a second rack (25) being mounted on the base (1) and meshing with the second gear (24), wherein the first rack (23) and the second rack (25) are fixedly connected, and a guide plate (26) matching the first rack (23) and the second rack (25) is also provided on the base (1).

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