A large-tonnage folding-arm truck-mounted crane

Abstract

The present invention discloses a large-tonnage folding arm truck-mounted crane, belonging to the field of crane technology. The large-tonnage folding arm truck-mounted crane includes a base, a folding arm, a telescopic assembly, a fixed pulley, and a hook. A wire rope is connected to the hook, and the wire rope passes over the fixed pulley on the folding arm and is connected to an external winch. A bending assembly is installed on the folding arm, and the bending assembly is used to bend the wire rope section between the fixed pulley and the hook. A release assembly is provided on the bending assembly, and the release assembly is used to disable the bending assembly when the hook moves upward to a fixed position. In the present invention, the bending assembly bends the wire rope. When a top-out phenomenon occurs, the release assembly will trigger an action, thereby disabling the bending assembly, and then the bent portion of the wire rope returns to a straight state, causing the lower end of the wire rope to move downward, reducing the upward movement caused by inertia, and avoiding damage to the crane and objects during top-out.

Description

Technical Field

[0001] The invention belongs to the technical field of cranes, and in particular relates to a large-tonnage folding-arm truck-mounted crane. Background Art

[0002] A crane is a multi-action lifting machine capable of vertically lifting and horizontally transporting heavy objects within a certain range. It is also known as an overhead crane, overhead crane, or overhead crane. The key feature of a tire crane is its combined operating cab and lifting control cabin. Evolved from crawler cranes, the crawler tracks and running frame of the traveling mechanism are replaced by a tire-covered chassis, overcoming the disadvantage of crawler cranes' track plates causing damage to the road surface. It is classified as a material handling machine. A bridge crane is a type of lifting equipment used horizontally above workshops, warehouses, and material yards to lift materials. Because its ends rest on tall concrete columns or metal supports, it resembles a bridge. The bridge crane's girth runs longitudinally along tracks laid on elevated platforms on both sides, fully utilizing the space beneath it to lift materials without obstruction from ground-based equipment. It is the most widely used and most numerous type of lifting machine. The operating characteristic of this type of lifting equipment is intermittent motion, meaning that the corresponding mechanisms for retrieving, transporting, and unloading materials operate alternately within a single operating cycle. Cranes are becoming increasingly popular in the market. Lifting and traveling with a load without outriggers often leads to accidents, and the crane travels faster than crawler cranes. Cranes offer stable operation, a large lifting capacity, and can travel with a load within a specified range. However, the road must be smooth and firm, the tire pressure must meet requirements, and the crane must not be more than 50 cm above the ground. Long-distance travel with a load is prohibited. To ensure operational safety, lifting without outriggers is generally prohibited in China. Wire ropes used with cranes include phosphate-coated, galvanized, and smooth-surfaced wire ropes.

[0003] The prior art, such as a folding arm truck crane disclosed in Chinese utility model patent publication number CN205204682U, belongs to the technical field of truck cranes. The technical problem to be solved is to provide a gantry folding arm truck crane with a simple structure, high reliability, and easy installation and maintenance. The technical solution adopted is: the bottom end of the column is offset and mounted on one side of the base assembly through a slewing drive, the hydraulic oil tank is fixedly mounted on the other side of the base assembly, the hydraulic motor is fixedly mounted on the slewing drive side, the upper end of the column is hinged to one end of the boom assembly, the other end of the boom assembly is hinged to one end of the arm assembly, and the other end of the boom assembly is hinged to the hook assembly. The cylinder body of the boom cylinder is hinged to the bottom of the column and the end of its piston rod is hinged to the middle of the boom assembly. The cylinder body of the boom cylinder is hinged to the middle of the boom assembly and the end of its piston rod is hinged to the boom assembly. The electrical system is controlled by a wired remote control. The utility model adopts column offset, overall rotation, and gantry folding to simplify the structure of the crane and improve its reliability.

[0004] The folding arm crane in the above-mentioned prior art mainly uses a winch to lift objects when hoisting objects, that is, the objects are lifted by the cooperation of the winch and the wire rope. When the winch lifts the objects, it is necessary to control the lifting height of the wire rope to prevent the top-hitting phenomenon. However, the existing crane mainly uses sensors to prevent the top-hitting phenomenon. In this case, since the wire rope has a certain inertia when hitting the top, especially when hoisting light objects, even if the sensor can detect it and generate an induction signal, the top-hitting phenomenon still exists due to the action of inertia. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a large-tonnage folding arm truck crane.

[0006] The technical solution adopted to solve the above technical problems is: a large-tonnage folding arm truck crane, comprising:

[0007] A base mounted on the external mobile body, wherein a folding arm is mounted on the base, and the folding arm is driven to move up and down by a telescopic assembly mounted on the base;

[0008] A fixed pulley is mounted on the folding arm, and a hook is provided below one of the fixed pulleys away from the base. A steel wire rope is connected to the hook, and the steel wire rope passes over the fixed pulley on the folding arm and is connected to an external winch;

[0009] a rope bending assembly mounted on the folding arm, the rope bending assembly being used to bend the steel wire rope segment between the fixed pulley and the hook;

[0010] A release assembly is provided on the bending rope assembly, and the release assembly is used to disable the bending rope assembly when the hook moves upward to a fixed position.

[0011] Through the above technical solution, the wire rope is bent by the bending rope assembly. When a top-impact phenomenon occurs, the release assembly will trigger an action, thereby causing the bending rope assembly to fail, and then the bent part of the wire rope to return to a straight state, so that the lower end of the wire rope moves downward, reducing the upward movement amplitude caused by inertia, and avoiding damage to the crane and objects during a top-impact phenomenon.

[0012] Furthermore, the folding arm includes a main folding arm hingedly mounted on the base, a main telescopic arm is hingedly mounted on one end of the main folding arm away from the base, and a secondary telescopic arm is telescopically mounted in the main telescopic arm.

[0013] Through the above technical solution, the secondary telescopic arm telescopically slides in the main telescopic arm, thereby enabling the hook to move. In addition, the main folding arm can rotate on the base, and the main telescopic arm can rotate on the main folding arm, thereby enabling the hook to move up and down.

[0014] Furthermore, the telescopic assembly includes a main driving cylinder hingedly mounted on the base, the telescopic rod end of the main driving cylinder hingedly mounted on the main folding arm, the main telescopic arm is equipped with a main telescopic cylinder, the telescopic rod end of the main telescopic cylinder is connected to the secondary telescopic arm, the main folding arm is hingedly mounted with a secondary driving cylinder, the telescopic rod end of the secondary driving cylinder is hinged to the main telescopic arm.

[0015] Through the above technical solution, the main driving cylinder drives the main folding arm to swing up and down along the hinge with the base, and the auxiliary driving cylinder drives the main telescopic arm to swing, thereby realizing the up and down movement of the hook.

[0016] Furthermore, there are multiple auxiliary telescopic arms, and the multiple auxiliary telescopic arms are telescopically plugged in sequence. A secondary telescopic oil cylinder is installed on the auxiliary telescopic arm, and the telescopic rod end of the secondary telescopic oil cylinder is connected to an adjacent auxiliary telescopic arm.

[0017] Through the above technical solution, the secondary telescopic arm is driven by the secondary telescopic oil cylinder to move linearly, thereby enabling the hook to move linearly.

[0018] Furthermore, the lower end of the wire rope is fixedly connected to a connecting rod, the lower end of the connecting rod is rotatably connected to a connecting seat, the lower end of the connecting seat is hingedly installed with an adjustment seat, the upper end of the hook is rotatably connected to the bottom of the adjustment seat, and the adjustment seat is provided with a rotating adjustment component for driving the hook to rotate in a horizontal plane.

[0019] Through the above technical solution, the rotary adjustment assembly drives the hook to rotate on the horizontal plane, so that the hook can hook objects more conveniently to facilitate quick lifting operations.

[0020] Furthermore, the rotation adjustment assembly includes a motor vertically mounted on the inner top wall of the adjustment seat, and the upper end of the hook is fixed with a rotating part, and the rotating part is drivingly connected to the motor shaft of the motor.

[0021] Through the above technical solution, the motor shaft of the motor rotates, thereby driving the rotating part to rotate. When the rotating part rotates, it can drive the upper end of the hook to rotate, thereby enabling the hook to rotate.

[0022] Furthermore, the rope bending assembly includes a fixed seat fixedly connected to the folding arm, a fixed cylinder extending downwardly fixedly connected to the fixed seat, a fixed arm fixedly connected to the outer wall of the lower end of the fixed cylinder, the fixed arm extends downwardly at one end away from the fixed cylinder and is horizontally penetrated by a sliding arm, the sliding arm slides freely on the fixed arm, and the sliding arm is rotatably connected to a bending rope wheel at one end away from the fixed arm, the wire rope passes around the bending rope wheel, and a tightening unit is provided on the fixed cylinder, and the tightening unit is used to drive the sliding arm to move in the direction of the wire rope, so that the bending rope wheel generates a lateral extrusion force on the wire rope, thereby causing the wire rope to be in a bent state.

[0023] Through the above technical solution, the pressing unit drives the sliding arm to move in a direction away from the fixed cylinder, thereby causing the bending wheel to squeeze the wire rope, so that the wire rope is in a bent state.

[0024] Furthermore, the tightening unit includes a rack rod fixedly connected to the end of the sliding arm away from the bending rope wheel, the lower end of the fixed cylinder is rotatably fitted with a rotating part, the periphery of the rotating part is provided with a gear part, the gear part and the rack rod are in an external meshing state, a sliding rod is telescopically installed in the fixed cylinder, a sliding hole is provided in the fixed cylinder for the sliding rod to pass freely, a transmission structure is provided between the sliding rod and the rotating part, the transmission structure is used to drive the rotating part to rotate circumferentially when the sliding rod moves vertically, and the periphery of the sliding rod is key-connected to the wall of the sliding hole.

[0025] Through the above technical solution, the sliding rod moves downward, and the transmission structure can drive the rotating part to rotate. When the rotating part rotates, the sliding arm is driven to move in the direction away from the fixed cylinder, thereby causing the bending rope wheel to squeeze the wire rope to make the wire rope curved.

[0026] Furthermore, the release assembly includes a floating arm horizontally fixed to the lower end of the sliding rod, and a rope hole is provided on the floating arm for the free passage of the steel wire rope. A tightening cylinder is vertically installed on the fixed arm, and the cylinder rod end of the tightening cylinder is abutted against the upper surface of the floating arm. The floating arm is used in conjunction with the connecting rod, and a guide wheel is installed on the upper surface of the floating arm. After the steel wire rope passes around the guide wheel, it passes through the rope hole.

[0027] Through the above technical solution, the pressing cylinder generates a downward squeezing force on the floating arm, which prevents the sliding rod from moving upward, so that the transmission structure cannot drive the rotating part to rotate, and the bending rope wheel is in a squeezing state on the wire rope, and the wire rope is in a bent state at the same time.

[0028] Furthermore, a return spring is vertically installed in the sliding hole, and two ends of the return spring in the elastic force direction elastically press against the upper end surface of the sliding rod and the top wall of the sliding hole respectively.

[0029] Through the above technical solution, the return spring has an elastic downward supporting force on the sliding rod, so that when the hook is in an unloaded state and the cylinder rod pressed against the cylinder is out of contact with the floating arm, the sliding rod will move downward and cause the rotating part to rotate, thereby causing the sliding arm to move away from the fixed cylinder, so that the bending rope wheel can squeeze the wire rope.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. In the present invention, the wire rope is bent by the bending assembly. When a head-over phenomenon occurs, the release assembly will trigger an action, thereby rendering the bending assembly inoperative, thereby restoring the bent portion of the wire rope to a straight state, causing the lower end of the wire rope to move downward, reducing the upward movement caused by inertia and avoiding damage to the crane and objects during a head-over phenomenon.

[0032] 2. In the present invention, the pressing cylinder exerts downward pressure on the floating arm, preventing the sliding rod from moving upward. This prevents the transmission structure from driving the rotating part to rotate, and causes the bending pulley to squeeze the wire rope, causing the wire rope to be bent.

[0033] 3. In the present invention, the return spring has an elastic downward pressing force on the sliding rod, so that when the hook is in an unloaded state and the cylinder rod pressed against the cylinder is out of contact with the floating arm, the sliding rod will move downward and cause the rotating part to rotate, thereby causing the sliding arm to move away from the fixed cylinder, so that the bending pulley can squeeze the wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a large-tonnage folding arm truck crane according to an embodiment of the present invention;

[0035] Figure 2 yes Figure 1 Enlarged schematic diagram of the local structure at point A

[0036] Figure 3 yes Figure 1 A schematic diagram of the positional relationship from another perspective;

[0037] Figure 4 This is a schematic diagram of the positional relationship among the adjusting seat, the hook and the connecting seat after assembly in the present invention;

[0038] Figure 5 This is a schematic diagram of the positional relationship among the fixed cylinder, the fixed arm, and the floating arm after assembly in the present invention;

[0039] Figure 6 yes Figure 5 Schematic diagram of the positional relationship of the middle part structure after it is cut open;

[0040] Figure 7 yes Figure 6 A magnified schematic diagram of the local structure at point B in the middle;

[0041] Figure 8 It is a structural schematic diagram of the rotating part in the present invention.

[0042] Figure numerals: 1. base; 2. main driving cylinder; 3. auxiliary driving cylinder; 4. main folding arm; 5. main telescopic arm; 6. main telescopic cylinder; 7. auxiliary telescopic cylinder; 8. auxiliary telescopic arm; 9. fixed pulley; 10. wire rope; 11. return spring; 12. hook; 13. adjustment seat; 14. rotating part; 15. motor; 16. connecting seat; 17. connecting rod; 18. fixed seat; 19. fixing cylinder; 20. tightening cylinder; 21. fixed arm; 22. bending rope pulley; 23. sliding arm; 24. guide wheel; 25. rack rod; 26. floating arm; 27. sliding rod; 28. spiral rolling groove; 29. ​​gear part; 30. rack segment; 31. perforation; 32. ball; 33. rotating part; 34. sliding hole. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] like Figures 1-8 As shown, this embodiment provides a large-tonnage folding arm truck crane, including a base 1 installed on an external mobile body. Specifically, the base 1 can be connected to the mobile body by screws or welding, so that the base 1 can move with the vehicle. A main folding arm 4 is hingedly installed on the base 1, and a main telescopic arm 5 is hingedly installed on the end of the main folding arm 4 away from the base 1. A multi-section auxiliary telescopic arm 8 is telescopically inserted and installed on the main telescopic arm 5. The two adjacent sections of the auxiliary telescopic arm 8 are telescopically inserted and connected, that is, a section of the auxiliary telescopic arm 8 away from the main telescopic arm 5 is telescopically inserted into a section of the auxiliary telescopic arm 8 adjacent to the main telescopic arm 5, so that the multi-section auxiliary telescopic arm 8 can be extended and retracted. The main folding arm 4, the main telescopic arm 5 and the multi-section auxiliary telescopic arm 8 are combined into a folding arm;

[0045] A main driving cylinder 2 is hingedly installed on the base 1, and the end of the telescopic rod of the main driving cylinder 2 is hingedly installed on the main folding arm 4, and a main telescopic cylinder 6 is installed on the main telescopic arm 5, and the end of the telescopic rod of the main telescopic cylinder 6 is connected to the auxiliary telescopic arm 8. A secondary driving cylinder 3 is hingedly installed on the main folding arm 4, and the end of the telescopic rod of the auxiliary driving cylinder 3 is hinged to the main telescopic arm 5. When the telescopic rod of the main driving cylinder 2 is extended, it will drive the main folding arm 4 to swing up and down along the hinge with the base 1, and the extension of the auxiliary driving cylinder 3 will drive the main telescopic arm 5 to swing up and down along the hinge with the main folding arm 4. A secondary telescopic cylinder 7 is installed on the auxiliary telescopic arm 8, and the end of the telescopic rod of the auxiliary telescopic cylinder 7 is connected to an adjacent auxiliary telescopic arm 8. When the telescopic rod of the auxiliary telescopic cylinder 7 is extended, it will drive one auxiliary telescopic arm 8 to telescopically slide inside the other auxiliary telescopic arm 8;

[0046] A fixed pulley 9 is installed on each of the main telescopic arm 5 and the multi-section auxiliary telescopic arm 8. A steel wire rope 10 is wound around the fixed pulleys 9. One end of the steel wire rope 10 is connected to a winch installed on the mobile vehicle body. The winch can pull the steel wire rope 10 to move. The end of the steel wire rope 10 away from the base 1 is fixedly connected to a connecting rod 17. The lower end of the connecting rod 17 is rotatably connected to a connecting seat 16. The lower end of the connecting seat 16 is hingedly installed with an adjusting seat 13. The bottom of the adjusting seat 13 is installed with a hook 12. Specifically, the hook 1 The upper end of the hook 12 is cylindrical and is rotatably connected to the bottom of the adjustment seat 13 by installing a bearing. The interior of the adjustment seat 13 is hollow, and a motor 15 is vertically installed on the top wall of the inner cavity of the adjustment seat 13. The upper end of the hook 12 is coaxially fixed with a rotating part 14. The rotating part 14 is driven by the motor shaft of the motor 15. When the motor shaft of the motor 15 rotates, it drives the rotating part 14 to rotate, thereby enabling the hook 12 to rotate around the axial direction of its upper end in a horizontal plane, thereby changing the direction of the hook 12;

[0047] A fixing seat 18 is welded to a secondary telescopic arm 8 away from the base 1. A fixing cylinder 19 extending downward is fixedly connected to the fixing seat 18. A fixing arm 21 is fixedly connected to the outer wall of the lower end of the fixing cylinder 19. The end of the fixing arm 21 away from the fixing cylinder 19 extends downward and is horizontally penetrated by a sliding arm 23. The sliding arm 23 slides freely on the fixing arm 21. The end of the sliding arm 23 away from the fixing arm 21 is rotatably connected to a bending rope wheel 22. The wire rope 10 passes around the bending rope wheel 22.

[0048] The sliding arm 23 is fixed with a rack rod 25 at one end away from the bending rope wheel 22, and a rotating part 33 is rotatably mounted on the lower end of the fixed cylinder 19. A gear portion 29 is provided on the periphery of the rotating part 33, and the gear portion 29 is in an external meshing state with the rack rod 25. Specifically, a rack segment 30 is provided on the outer wall of the rack rod 25, and the rack segment 30 is in an external meshing state with the gear portion 29. A sliding rod 27 is telescopically installed in the fixed cylinder 19, and a sliding hole 34 is provided in the fixed cylinder 19 for the sliding rod 27 to pass freely. A transmission structure is provided between the sliding rod 27 and the rotating part 33. The transmission structure is used to drive the rotating part 33 to rotate circumferentially when the sliding rod 27 moves vertically. The periphery of the sliding rod 27 is connected to the inner wall of the fixed cylinder 19 The cavity wall is keyed, and a through-hole 31 is provided on the end surface of the rotating portion 33 for the sliding rod 27 to pass freely. Specifically, the transmission structure includes a ball 32 rotatably mounted on the inner wall of the through-hole 31 of the rotating portion 33. The number of balls 32 is set to two and they are symmetrically arranged along the axial direction of the rotating portion 33. A spiral rolling groove 28 for the ball 32 to engage is provided on the periphery of the sliding rod 27. Since the periphery of the sliding rod 27 is keyed to the inner wall of the sliding hole 34, when the sliding rod 27 is telescopically inserted and extended in the sliding hole 34 of the fixed cylinder 19, the sliding rod 27 will not produce circumferential rotation, but the ball 32 will roll in the spiral rolling groove 28, causing the rotating portion 33 to produce rotational motion.

[0049] The lower end of the sliding rod 27 is horizontally fixed with a floating arm 26, and a rope hole is opened on the floating arm 26 for the free passage of the wire rope 10. A tightening cylinder 20 is vertically installed on the fixed arm 21. The cylinder rod end of the tightening cylinder 20 is against the upper surface of the floating arm 26. The floating arm 26 is used in conjunction with the connecting rod 17. A guide wheel 24 is installed on the upper surface of the floating arm 26. After the wire rope 10 passes around the guide wheel 24, it passes through the rope hole. A return spring 11 is vertically installed in the sliding hole 34. The elastic direction of the return spring 11 is The two ends elastically press against the upper end surface of the sliding rod 27 and the inner top wall of the sliding hole 34 respectively. In addition, a sensing block (not shown in the figure) is provided on the connecting seat 16, and a sensor (not shown in the figure) is provided on the floating arm 26. The sensor is used in conjunction with the sensing block. When the sensing block enters the sensing range of the sensor, it indicates that the hook 12 may have a top-impact phenomenon. The sensor generates a sensing signal and transmits it to an external control cabinet. The external control cabinet controls the external winch to stop working to prevent the wire rope 10 from continuing to pull the hook 12 upward.

[0050] The working principle of this embodiment is as follows:

[0051] When the hook 12 is unloaded, the cylinder rod of the cylinder 20 is in a retracted state, that is, the end of the cylinder rod of the cylinder 20 is out of contact with the surface of the floating arm 26. At this time, the return spring 11 has a downward elastic supporting force on the sliding rod 27, thereby causing the sliding rod 27 to move downward. It should be noted that the return spring 11 in this embodiment is selected by those skilled in the art so that the elastic supporting force of the return spring 11 on the sliding rod 27 is greater than the gravity of the connecting seat 16, the hook 12, the motor 15, the adjusting seat 13 and other components, thereby ensuring that when the return spring 11 is extended downward, the sliding rod 27 can overcome the gravity of the connecting seat 16, the hook 12, the motor 15, the adjusting seat 13 and other components and move downward. When the sliding rod 27 moves downward, the ball 32 is in the spiral rolling groove 28 The gear 29 on the gear 29 and the gear 30 on the rack rod 25 are meshed with each other, so that the rack rod 25 can drive the sliding arm 23 to move in the direction away from the fixed cylinder 19, and the bending pulley 22 squeezes the wire rope 10 between the fixed pulley 9 and the hook 12, so that the wire rope 10 is bent, which is equivalent to increasing the length of the wire rope 10 between the fixed pulley 9 (a fixed pulley 9 away from the base 1) and the hook 12.

[0052] When the wire rope 10 is bent, the pressing cylinder 20 is activated, the cylinder rod of the pressing cylinder 20 is extended, and the end of the cylinder rod of the pressing cylinder 20 presses against the floating arm 26 to prevent the floating arm 26 from moving upward. In this way, when the hook 12 retrieves an object, the wire rope 10 exerts a lateral force on the bending pulley 22 due to the increase in gravity, which in turn causes the sliding arm 23 to move in the opposite direction.

[0053] When hoisting objects, first the telescopic rod of the main driving oil cylinder 2 is extended, driving the main folding arm 4 to swing up and down along the hinge with the base 1, and the telescopic extension of the auxiliary driving oil cylinder 3 drives the main telescopic arm 5 to swing up and down along the hinge with the main folding arm 4, and the auxiliary telescopic oil cylinder 7 is installed on the auxiliary telescopic arm 8. The end of the telescopic rod of the auxiliary telescopic oil cylinder 7 is connected to an adjacent auxiliary telescopic arm 8. When the telescopic rod of the auxiliary telescopic oil cylinder 7 is extended, it will drive one auxiliary telescopic arm 8 to telescope and slide inside the other auxiliary telescopic arm 8, so that the hook 12 can move to the place where the object is to be hoisted, and then by starting the motor 15, the motor shaft of the motor 15 rotates, so that the direction of the hook 12 can be changed, and then the hook 12 can hook the object, so that the object can be hung on the hook 12 without manual means, and then the main driving oil cylinder 2, the auxiliary driving oil cylinder 3, the main telescopic oil cylinder 6, and the auxiliary telescopic oil cylinder 7 are extended and retracted, so as to realize the hoisting operation of the hook 12 on the object;

[0054] If a top collision occurs, the connecting rod 17 moves upward and causes the sensing block to move upward, and then enters the sensing range of the sensor. The sensor generates a sensing signal and transmits it to the external control cabinet. The external control cabinet controls the external winch to stop working, preventing the wire rope 10 from continuing to pull the hook 12 upward, and the control cabinet simultaneously controls the tightening cylinder 20 to start, and the cylinder rod of the tightening cylinder 20 retracts and breaks away from the contact state with the floating arm 26. At the same time, if the connecting rod 17 hits the top with a large amplitude, the connecting rod 17 will contact the floating arm 26 and cause the floating arm 26 to move upward. When the floating arm 26 moves upward, it will drive the sliding rod 27 to move upward. Since the periphery of the sliding rod 27 is key-connected with the inner wall of the sliding hole 34, when the sliding rod 27 is telescopically inserted in the sliding hole 34 of the fixed cylinder 19, the sliding rod 27 will not produce circumferential rotation, and the ball 32 will roll in the spiral rolling groove 28, and cause the rotating part 33 to produce rotation. When the rotating part 33 rotates, the gear part 29 on the rotating part 33 and the rack segment 30 on the rack rod 25 are meshed and transmitted, thereby enabling the rack rod 25 to drive the sliding arm 23 to move in the direction close to the fixed cylinder 19, thereby causing the rope bending wheel 22 to move in the direction close to the fixed cylinder 19, so that the squeezing state of the rope bending wheel 22 on the wire rope 10 disappears, and the part of the wire rope 10 that was originally in a bent state will naturally become vertical, which is equivalent to increasing the longitudinal distance between the hook 12 and the fixed pulley 9, thereby reducing the distance between the hook 12 and the fixed pulley 9, and the potential energy of the hook 12 hitting the top will increase, thereby reducing the inertial movement distance when hitting the top. Compared with the existing technology that simply uses sensor detection, it can largely avoid the damage caused by hitting the top. In addition, during the upward movement of the sliding rod 27, it will squeeze the return spring 11, causing the return spring 11 to generate elastic potential energy, thereby buffering the top impact of the hook 12;

[0055] After the top protection operation, since the wire rope 10 does not continue to pull the hook 12, and the hook 12 and the object are in a static state, the winch is started at this time, and the winch slowly unwinds the wire rope 10 downward, so that the hook 12 moves the object downward. When moving downward, the floating arm 26 will gradually move away from the connecting rod 17, and then the main driving cylinder 2, the auxiliary driving cylinder 3, the main telescopic cylinder 6 and the auxiliary telescopic cylinder 7 will cooperate to place the object in the lifting area and make the hook 12 is separated from the object, and the hook 12 is in an unloaded state. Then the pressing cylinder 20 is started, and the cylinder rod of the pressing cylinder 20 is extended, and the end of the cylinder rod of the pressing cylinder 20 gradually approaches the floating arm 26. After contacting the floating arm 26, the cylinder rod of the pressing cylinder 20 continues to extend, thereby driving the floating arm 26 to move downward. When the floating arm 26 moves downward, it will drive the sliding rod 27 to move downward. When the sliding rod 27 slides downward in the sliding hole 34, it will cause the roller When the gear 33 is in the state of being rotated, the gear 33 of the gear 33 is engaged with the gear 30 of the gear 33 and the gear 30 of the gear 33. When the gear 33 is in the state of being rotated, the gear 33 of the gear 33 is engaged with ...

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A large-tonnage folding arm truck crane, characterized in that: include: A base (1) mounted on an external mobile vehicle body, a folding arm mounted on the base (1), and the folding arm is driven to move up and down by a telescopic assembly mounted on the base (1); A fixed pulley (9) is mounted on the folding arm, and a hook (12) is provided below one of the fixed pulleys (9) away from the base (1). A steel wire rope (10) is connected to the hook (12). The steel wire rope (10) passes around the fixed pulley (9) on the folding arm and is connected to an external winch. The lower end of the steel wire rope (10) is fixedly connected to a connecting rod (17), the lower end of the connecting rod (17) is rotatably connected to a connecting seat (16), the lower end of the connecting seat (16) is hingedly mounted with an adjusting seat (13), the upper end of the hook (12) is rotatably connected to the bottom of the adjusting seat (13), and the adjusting seat (13) is provided with a rotating adjustment component for driving the hook (12) to rotate in a horizontal plane; A rope bending assembly is mounted on the folding arm, and is used to bend the steel wire rope (10) between the fixed pulley (9) and the hook (12). The rope bending assembly includes a fixing seat (18) fixed to the folding arm, a fixing cylinder (19) extending downward is fixed to the fixing seat (18), a fixing arm (21) is fixed to the outer wall of the lower end of the fixing cylinder (19), and the fixing arm (21) extends downward at one end away from the fixing cylinder (19) and is horizontally penetrated by a sliding arm (23). The sliding arm (23) slides freely on the fixed arm (21), and one end of the sliding arm (23) away from the fixed arm (21) is rotatably connected to a bending rope wheel (22), and the steel wire rope (10) passes around the bending rope wheel (22). A tightening unit is provided on the fixed cylinder (19), and the tightening unit is used to drive the sliding arm (23) to move in the direction of the steel wire rope (10), so that the bending rope wheel (22) generates a lateral squeezing force on the steel wire rope (10), thereby causing the steel wire rope (10) to be bent; The tightening unit includes a rack rod (25) fixed to one end of the sliding arm (23) away from the bending rope wheel (22), a rotating part (33) is rotatably mounted on the lower end of the fixed cylinder (19), a gear part (29) is provided on the periphery of the rotating part (33), and the gear part (29) is in an external meshing state with the rack rod (25), a sliding rod (27) is telescopically inserted and installed in the fixed cylinder (19), a sliding hole (34) is provided in the fixed cylinder (19) for the sliding rod (27) to pass freely, a transmission structure is provided between the sliding rod (27) and the rotating part (33), and the transmission structure is used to drive the rotating part (33) to rotate circumferentially when the sliding rod (27) moves vertically, and the periphery of the sliding rod (27) is key-connected to the wall of the sliding hole (34); A release assembly is provided on the bending rope assembly, and the release assembly is used to disable the bending rope assembly when the hook (12) moves upward to a fixed position. The release assembly includes a floating arm (26) fixed horizontally to the lower end of the sliding rod (27), and a rope hole is provided on the floating arm (26) for the free passage of the wire rope (10). A tightening cylinder (20) is vertically installed on the fixed arm (21), and the cylinder rod end of the tightening cylinder (20) is in contact with the floating arm (26). The upper surfaces of the movable arm (26) are pressed against each other, and the floating arm (26) is used in conjunction with the connecting rod (17). A guide wheel (24) is installed on the upper surface of the floating arm (26). After the wire rope (10) passes through the guide wheel (24), it passes through the rope hole. A return spring (11) is vertically installed in the sliding hole (34). The two ends of the return spring (11) in the elastic force direction elastically press against the upper end surface of the sliding rod (27) and the inner top wall of the sliding hole (34).

2. A large-tonnage folding arm truck crane according to claim 1, characterized in that: The folding arm comprises a main folding arm (4) hingedly mounted on the base (1); a main telescopic arm (5) is hingedly mounted on one end of the main folding arm (4) away from the base (1); and a secondary telescopic arm (8) is telescopically mounted inside the main telescopic arm (5).

3. The large-tonnage folding arm truck crane according to claim 2, characterized in that: The telescopic assembly comprises a main driving oil cylinder (2) hingedly mounted on the base (1); the end of the telescopic rod of the main driving oil cylinder (2) is hingedly mounted on the main folding arm (4); a main telescopic oil cylinder (6) is mounted on the main telescopic arm (5); the end of the telescopic rod of the main telescopic oil cylinder (6) is connected to the auxiliary telescopic arm (8); a secondary driving oil cylinder (3) is hingedly mounted on the main folding arm (4); the end of the telescopic rod of the auxiliary driving oil cylinder (3) is hingedly connected to the main telescopic arm (5).

4. The large-tonnage folding arm truck crane according to claim 2, characterized in that: A plurality of auxiliary telescopic arms (8) are provided, and the plurality of auxiliary telescopic arms (8) are telescopically plugged in and connected in sequence. An auxiliary telescopic oil cylinder (7) is installed on the auxiliary telescopic arm (8), and the end of the telescopic rod of the auxiliary telescopic oil cylinder (7) is connected to an adjacent auxiliary telescopic arm (8).

5. The large-tonnage folding arm truck crane according to claim 1, characterized in that: The rotary adjustment assembly comprises a motor (15) vertically mounted on the inner top wall of the adjustment seat (13); a rotating portion (14) is fixedly connected to the upper end of the hook (12); and the rotating portion (14) is drivingly connected to the motor shaft of the motor (15).

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