Electric control gantry crane lifting appliance

Abstract

The invention relates to the technical field of gantry cranes, and particularly discloses an electric control gantry crane lifting appliance which comprises a portal frame, sliding grooves, an electric hoist, an overload protection mechanism and a stabilizing mechanism, the sliding grooves are formed in the left end and the right end of the front side and the rear side of the portal frame in the vertical direction, and the electric hoist is arranged in the middle of the top end of the portal frame; the overload protection mechanism is arranged at the bottom end of the electric hoist. The stabilizing mechanism is arranged in the middle of the outer wall of the portal frame. According to the device, the risks of structural instability and equipment damage caused by overload are completely eradicated, potential safety hazards caused by manual misjudgment are remarkably reduced, the swing amplitude of goods can be strictly controlled within a safety threshold value, the stability during long-distance transportation and emergency braking is ensured, in addition, the risk of goods falling is eliminated, and the safety and reliability are improved. And an efficient, safe and reliable operation guarantee is provided for scenes such as port loading and unloading, warehouse logistics and heavy machinery manufacturing.

Description

Technical Field

[0001] The invention relates to the technical field of gantry cranes, and in particular to an electric controlled gantry crane hoist. Background Art

[0002] As a key equipment in the field of modern industrial handling, the technological evolution of electric controlled gantry cranes has always been centered around the two core goals of improving operating efficiency and ensuring operational safety. Electric gantry cranes use a gantry structure that spans the operating area and an electric hoist system that can move longitudinally along the track to achieve precise lifting and spatial transfer of heavy goods. They are widely used in port loading and unloading, warehousing and logistics, and heavy machinery manufacturing. This type of equipment replaces traditional manual operation with electric drive, significantly improving the single lifting weight and operation continuity, but the accompanying technical challenges cannot be ignored; The existing electric gantry crane system has significant defects in terms of safety control. On the one hand, although the equipment has a preset maximum load limit, in actual operation, it is often overloaded due to human misjudgment of the load or loose cargo bundling. When the lifting weight exceeds the design threshold, it may cause a chain reaction such as wire rope breakage, motor overload and burning, or even gantry structure instability, which will not only cause equipment damage but also endanger the safety of workers below. On the other hand, the existing hoists lack effective anti-sway and anti-slip mechanisms during dynamic handling. The cargo is prone to violent swinging due to inertia during lifting and translation stages, especially in long-distance transportation or emergency braking, the swing amplitude may exceed the safety range. At the same time, when encountering emergencies such as motor failure, brake system failure or power outage, the hoist lacks redundant protection design and is prone to cargo falling accidents, posing a major threat to surrounding equipment and personnel. Summary of the invention

[0003] The purpose of the present invention is to provide an electrically controlled gantry crane to solve the problem of potential safety hazards in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: an electric controlled gantry crane, comprising: a gantry, a slide, an electric hoist, an overload protection mechanism and a stabilizing mechanism, wherein slides are provided at both the front and rear sides and the left and right ends of the gantry in the up and down directions, the electric hoist is arranged at the middle of the top of the gantry, the overload protection mechanism is arranged at the bottom of the electric hoist, and the stabilizing mechanism is arranged at the middle of the outer wall of the gantry; The overload protection mechanism includes: a hanger, a gravity linkage component and a hook. The hanger is arranged at the bottom end of the electric hoist, and the gravity linkage component is arranged in the inner cavity of the hanger. The gravity linkage component can make corresponding actions according to the weight of the suspended object, and the hook is arranged at the bottom end of the gravity linkage component.

[0005] Preferably, the gravity linkage assembly comprises: a support rod, a spring, a linkage block, a first connecting rod, a second connecting rod, a push rod and an emergency stop switch, the left and right ends of the support rod are respectively arranged at the bottom ends of the left and right sides of the inner cavity of the hanger, the spring is sleeved on the middle part of the outer wall of the support rod, the number of the linkage blocks is two, the two linkage blocks are respectively slidably sleeved on the left and right sides of the outer wall of the support rod, the left and right ends of the spring are respectively clamped on the inner sides of the two linkage blocks, the number of the first connecting rods is two, the top ends of the two first connecting rods are respectively rotatably arranged at the bottom ends of the two linkage blocks through pins, the bottom ends of the two first connecting rods are respectively rotatably arranged at the left and right sides of the top end of the hook through pins, the number of the second connecting rods is two, the bottom ends of the two second connecting rods are respectively rotatably arranged at the top ends of the two linkage blocks through pins, the left and right sides of the bottom end of the push rod are respectively rotatably arranged at the top ends of the two second connecting rods through pins, the emergency stop switch is arranged in the middle part of the top end of the hanger, the position of the emergency stop switch corresponds to the position of the push rod, and the emergency stop switch is electrically connected to the electric hoist.

[0006] Preferably, a limiting plate is provided at the top end of the inner cavity of the hanger, and the top end of the outer wall of the push rod can be slidably adapted to be inserted into the inner cavity of the limiting plate.

[0007] Preferably, the stabilizing mechanism comprises: a lifting assembly and a stabilizing cable, the number of the lifting assemblies is two, and the two lifting assemblies are respectively arranged on the left and right sides of the outer wall of the gantry, the number of the stabilizing cables is several, and the several stabilizing cables are equally divided into two groups, the two ends of the two groups of stabilizing cables are respectively arranged on the inner sides of the two lifting assemblies, and the outer walls of the two groups of stabilizing cables are respectively slidably arranged on the front and rear sides of the hanger.

[0008] Preferably, the lifting assembly includes: a rack, a support plate, a slider, a connecting rod, a gear and a driving assembly, the number of the racks is two, and the two racks are respectively arranged on the left and right sides of the gantry, the number of the support plates is two, and the two support plates can be slidably sleeved on the left and right sides of the outer wall of the gantry, the two ends of the stabilizing cable are respectively arranged on the inner sides of the two support plates, the number of the sliders is four, and the four sliders are respectively arranged on the front and back sides of the inner cavity of the two support plates, the sliders can be slidably adapted and inserted in the inner cavity of the slide groove, the front and back ends of the connecting rod are respectively rotatably arranged on the front and back inner ends of the inner cavity of the support plate through bearings, the gear is sleeved on the outer wall of the connecting rod and locked by a top screw, the gear and the rack are meshed, and the driving assembly is arranged in the inner cavity of the support plate.

[0009] Preferably, the driving assembly includes: a worm wheel, a motor and a worm, the worm wheel is sleeved on the outer wall of the connecting rod and locked by a top screw, the motor is screwed to the bottom end of the support plate, the motor and the electric hoist are electrically connected, the bottom end of the worm is locked to the output end of the motor through a coupling, the top end of the worm can be rotatably extended into the inner cavity of the support plate, and the worm and worm wheel are meshed.

[0010] Preferably, the distance between the top end of the push rod and the bottom end of the emergency stop switch is smaller than the length of the second connecting rod.

[0011] Preferably, the cooperation between the gear and the rack causes the support plate to move upward or downward and positions the support plate.

[0012] Preferably, the rotation of the worm drives the gear to rotate through the worm wheel and the connecting rod, and the cooperation between the worm and the worm wheel is used to prevent the gear from driving the worm wheel to rotate due to gravity.

[0013] The electric controlled gantry crane proposed by the present invention has the following beneficial effects: The present invention can lift objects by the hook, and use the electric hoist to drive the hanger to rise. When the hanger rises, the supporting rod can drive the linkage block to rise. When the linkage block rises, the first link and the hook can be used to drive the object to rise. Since the object itself has a certain gravity, when the supporting rod rises, the weight of the object itself can be used to pull the hook to move downward. When the hook moves downward, the two first links can be used to pull the two linkage blocks to move inward synchronously, and the springs can be squeezed to produce elastic deformation. When the two linkage blocks move inward synchronously, the two second links can be used to push the push rod to move upward, until the two linkage blocks move to a suitable position. At this time, the gravity of the object itself can no longer Continue to squeeze the spring to cause elastic deformation, and use the electric hoist to continuously drive the hanger to move upward, so that the object can be lifted up through the cooperation between the support rod, the linkage block, the first connecting rod and the hook. When the weight of the object is greater than the maximum load capacity of the electric hoist or the gantry, the two first connecting rods can be used to drive the two linkage blocks to move inward, and at the same time, the linkage block can be used to drive the bottom end of the second connecting rod to move inward, and then the top end of the second connecting rod can be used to push the push rod upward until the top end of the push rod contacts the emergency stop switch, and the push rod is used to squeeze the emergency stop switch to prompt the electric hoist to stop moving, thereby stopping the continued pulling of the object upward and preventing damage to the electric hoist or the gantry.

[0014] 2. The present invention can ensure the stability of the hanger by stabilizing the cable, thereby reducing the swing amplitude of the object. When encountering sudden situations such as electric hoist failure, brake system failure or power outage, which causes the traction force of the electric hoist to fail, the cooperation between the worm wheel and the worm can prevent the worm wheel from rotating, so that the worm wheel can prevent the connecting rod and the gear from rotating, and the cooperation between the gear and the rack can ensure the stability of the support plate position, so that the cooperation between the support plate and the stabilizing cable can prevent the object from falling, thereby eliminating safety hazards.

[0015] 3. This device eliminates the risk of structural instability and equipment damage caused by overloading, significantly reduces the safety hazards caused by human misjudgment, and can strictly control the swing amplitude of goods within the safety threshold to ensure stability during long-distance transportation and emergency braking. In addition, it eliminates the risk of falling goods and provides efficient, safe and reliable operation guarantees for port loading and unloading, warehousing logistics and heavy machinery manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 The local structure diagram of Figure 3 An exploded view of the present invention; Figure 4 This is the structural diagram of the overload protection mechanism; Figure 5 This is the exploded diagram of the overload protection mechanism; Figure 6 An exploded view of the stabilizing mechanism; Figure 7 for Figure 3 A magnified image of point A; Figure 8 for Figure 6 Enlarged view of point B.

[0017] In the figure: 1. gantry; 2. slide; 3. overload protection mechanism; 31. hanger; 32. limit plate; 33. support rod; 34. spring; 35. linkage block; 36. first connecting rod; 37. hook; 38. second connecting rod; 39. push rod; 310. emergency stop switch; 4. stabilizing mechanism; 41. rack; 42. support plate; 43. slider; 44. connecting rod; 45. gear; 46. worm gear; 47. motor; 48. worm; 49. stabilizing cable; 5. electric hoist. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 8 The present invention provides a technical solution for an electrically controlled gantry crane, comprising: a gantry 1, a slide 2, an overload protection mechanism 3, a stabilizing mechanism 4 and an electric hoist 5. Slides 2 are provided on both the front and rear sides and the left and right ends of the gantry 1 in the up and down directions. The electric hoist 5 is arranged in the middle of the top of the gantry 1. The electric hoist 5 is a prior art and will not be described in detail herein. The electric hoist 5 is used for lifting objects. The overload protection mechanism 3 is arranged at the bottom of the electric hoist 5. When the weight of the object lifted by the electric hoist 5 exceeds the maximum load of the electric hoist 5 and the gantry 1, the overload protection mechanism 3 can automatically shut down the electric hoist 5 to prevent the electric hoist 5 from continuing to work. The stabilizing mechanism 4 is arranged in the middle of the outer wall of the gantry 1. The stabilizing mechanism 4 is used to reduce the swing amplitude of the suspended object.

[0020] As a preferred solution, further, the overload protection mechanism 3 includes: a hanger 31, a gravity linkage assembly and a hook 37. The hanger 31 is arranged at the bottom end of the electric hoist 5, and the gravity linkage assembly is arranged in the inner cavity of the hanger 31. The gravity linkage assembly can make corresponding actions according to the weight of the suspended object. The hook 37 is arranged at the bottom end of the gravity linkage assembly, and the hook 37 is used to hook up the object.

[0021] As a preferred solution, further, the gravity linkage assembly includes: a limit plate 32, a support rod 33, a spring 34, a linkage block 35, a first connecting rod 36, a second connecting rod 38, a push rod 39 and an emergency stop switch 310. The left and right ends of the limit plate 32 are respectively arranged at the top ends of the left and right sides of the inner cavity of the hanger 31. The limit plate 32 is used to limit the push rod 39. The left and right ends of the support rod 33 are respectively arranged at the bottom ends of the left and right sides of the inner cavity of the hanger 31. The support rod 33 is used to support the lifted objects. The spring The spring 34 is sleeved on the middle part of the outer wall of the support rod 33. The spring 34 is a rotation spring. It undergoes elastic deformation after being squeezed or stretched by external force, and returns to its initial state after the external force is removed. The spring 34 is used to support the object. There are two linkage blocks 35. The two linkage blocks 35 are slidably sleeved on the left and right sides of the outer wall of the support rod 33 respectively. The left and right ends of the spring 34 are respectively clamped on the inner sides of the two linkage blocks 35. There are two first connecting rods 36. The top ends of the two first connecting rods 36 are rotatably arranged on the bottom ends of the two linkage blocks 35 through pins respectively. The bottom ends of the two first connecting rods 36 are rotatably arranged on the left and right sides of the top end of the hook 37 through pins respectively. There are two second connecting rods 38. The bottom ends of the two second connecting rods 38 are rotatably arranged on the top ends of the two linkage blocks 35 through pins respectively. The bottom ends of the push rods 39 are rotatably arranged on the top ends of the two second connecting rods 38 through pins respectively. The top end of the outer wall of the push rods 39 is slidably adapted to be inserted into the limit plate 32. Inner cavity, the push rod 39 is used to press the emergency stop switch 310, the emergency stop switch 310 is set in the middle of the top of the hanger 31, the position of the emergency stop switch 310 corresponds to the position of the push rod 39, the emergency stop switch 310 and the electric hoist 5 are electrically connected, and the electric hoist 5 can be shut down by pressing the emergency stop switch 310. The distance between the top of the push rod 39 and the bottom of the emergency stop switch 310 is less than the length of the second connecting rod 38, ensuring that the push rod 39 can contact the emergency stop switch 310.

[0022] As a preferred solution, further, the stabilizing mechanism includes: a lifting component and a stabilizing cable 49. There are two lifting components, which are respectively arranged on the left and right sides of the outer wall of the gantry 1. The lifting components are used to drive the stabilizing cables 49 to move up and down. There are several stabilizing cables 49, and several stabilizing cables 49 are equally divided into two groups. The two ends of the two groups of stabilizing cables 49 are respectively arranged on the inner sides of the two lifting components, and the outer walls of the two groups of stabilizing cables 49 are respectively slidably arranged on the front and rear sides of the hanger 31. The stabilizing cables 49 are used to ensure the stability of the hanger 31 and reduce the swing amplitude of the hanger 31. When encountering emergencies such as electric hoist failure, brake system failure or power outage, the stabilizing cables 49 can be used to pull objects to prevent them from falling.

[0023] As a preferred solution, further, the lifting assembly includes: a rack 41, a support plate 42, a slider 43, a connecting rod 44, a gear 45 and a driving assembly. The number of racks 41 is two, and the two racks 41 are respectively arranged on the left and right sides of the gantry 1. The number of support plates 42 is two, and the two support plates 42 are respectively slidably sleeved on the left and right sides of the outer wall of the gantry 1. The two ends of the stabilizing cable 49 are respectively arranged on the inner sides of the two support plates 42. The number of sliders 43 is four, and the four sliders 43 are respectively arranged on the front and rear sides of the inner cavities of the two support plates 42. The sliders 43 can slide The slider 43 is adapted to be inserted into the inner cavity of the slide 2, and the support plate 42 can be limited by the cooperation between the slider 43 and the slide 2. The front and rear ends of the connecting rod 44 are rotatably arranged at the inner ends of the front and rear sides of the inner cavity of the support plate 42 through bearings respectively. The gear 45 is sleeved on the outer wall of the connecting rod 44 and locked by a top screw. The gear 45 and the rack 41 are meshed. The cooperation between the gear 45 and the rack 41 can cause the support plate 42 to move up and down and position the support plate 42. The driving component is arranged in the inner cavity of the support plate 42, and the driving component is used to drive the gear 45 to rotate.

[0024] As a preferred solution, further, the driving assembly includes: a worm gear 46, a motor 47 and a worm 48. The worm gear 46 is sleeved on the outer wall of the connecting rod 44 and locked by a top screw. The motor 47 is screwed to the bottom end of the support plate 42. The motor 47 and the electric hoist 5 are electrically connected. The motor 47 is a prior art. The motor 47 is a servo motor, which will not be described in detail here. The motor 47 is used here to drive the worm 48 to rotate. The bottom end of the worm 48 is locked at the output end of the motor 47 through a coupling. The top end of the worm 48 can rotatably extend into the inner cavity of the support plate 42. The worm 48 and the worm wheel 46 are meshed. The rotation of the worm 48 can drive the gear 45 to rotate through the worm wheel 46 and the connecting rod 44, and the cooperation between the worm 48 and the worm wheel 46 can prevent the gear 45 from driving the worm wheel 46 to rotate due to gravity.

[0025] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0026] When in use, start the electric hoist 5, and use the electric hoist 5 to drive the hanger 31 to descend. At the same time, start the motor 47, and use the output end of the motor 47 to drive the worm 48 to rotate. The rotation of the worm 48 can drive the connecting rod 44 to rotate through the worm gear 46, and then the connecting rod 44 can drive the gear 45 to rotate. The gear 45 can cooperate with the rack 41 to cause the support plate 42 to move downward. The downward movement of the support plate 42 can drive the stabilizing cable 49 to move downward synchronously with the hanger 31 until the hanger 31 descends to a suitable position, and the objects to be lifted are hung on the hook 37. Start the electric hoist 5, and use the electric hoist 5 to pull the hanger 31 up. At the same time, start the motor 47, and use the output end of the motor 47 to drive the worm 48 to rotate in the opposite direction. The support plate 42 rotates, and then moves in the opposite direction to the above, so that the support plate 42 drives the stabilizing cable 49 to move upward synchronously with the hanger 31. The upward movement of the hanger 31 can use the gravity of the object itself to pull the hook 37 downward, so that the hook 37 can pull the bottom ends of the two first connecting rods 36 to move downward, and then the top ends of the two first connecting rods 36 can be used to pull the two linkage blocks 35 to move synchronously inward along the outer wall of the support rod 33, and squeeze the spring 34 to undergo elastic deformation. The synchronous inward movement of the two linkage blocks 35 can drive the bottom ends of the two second connecting rods 38 to move synchronously inward, and then the top ends of the two second connecting rods 38 can be used to push the push rod 39 to move upward until the two linkage blocks 35 slide inward to a suitable position. The spring 34 is placed in a position and squeezed to a suitable degree. Under the elastic support of the spring 34, the weight of the object can no longer continue to cause the top ends of the two first connecting rods 36 to pull the two linkage blocks 35 to move inward to squeeze the spring 34. Then, as the electric hoist 5 continues to pull the hanger 31 upward, the hanger 31 can be used to pull the object upward through the support rod 33, the first connecting rod 36 and the hook 37, and the stability of the movement of the hanger 31 is ensured by the stabilizing cable 49, thereby reducing the swaying degree of the object. When the weight of the object lifted by the hook 37 is greater than the maximum load of the electric hoist 5 or the gantry 1, the first connecting rod 36 can be used to pull the linkage block 35 inward under the weight of the object, and squeeze the spring 34 to cause elastic deformation, thereby The linkage block 35 can be used to push the push rod 39 upward through the second connecting rod 38 until the top of the push rod 39 contacts the emergency stop switch 310, and the top of the push rod 39 can be used to press the emergency stop switch 310, so that the electric hoist 5 can be stopped and prevented from continuing to lift objects, thereby preventing the objects from falling off the ground, and further preventing the electric hoist 5 from causing a chain reaction such as wire rope breakage, motor overload burning, and even gantry structure instability due to overload, thereby eliminating safety hazards. When encountering an emergency situation in which the electric hoist 5 loses traction due to a fault in the electric hoist 5, a failure in the brake system, or a power outage, the cooperation between the worm 48 and the worm wheel 46 can prevent the gear 45 from driving the worm wheel 46 to rotate through the connecting rod 44.Therefore, the position of the support plate 42 can be fixed by the cooperation between the gear 45 and the rack 41, and then the hanger 31 can be pulled by the stabilizing cable 49, so as to prevent the suspended objects from falling due to the loss of traction of the electric hoist 5, thereby eliminating the potential safety hazard.

[0027] This device eliminates the risk of structural instability and equipment damage caused by overloading, significantly reduces the safety hazards caused by human misjudgment, and can strictly control the swing amplitude of cargo within the safety threshold to ensure stability during long-distance transportation and emergency braking. In addition, it eliminates the risk of cargo falling, and provides efficient, safe and reliable operation guarantees for port loading and unloading, warehousing logistics, and heavy machinery manufacturing.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electrically controlled gantry crane, characterized in that: include: A gantry (1), wherein the gantry (1) is provided with slide grooves (2) in the up-down direction on both the front and rear sides and the left and right ends; An electric hoist (5), wherein the electric hoist (5) is arranged at the middle of the top end of the gantry (1); An overload protection mechanism (3), wherein the overload protection mechanism (3) is arranged at the bottom end of the electric hoist (5); A stabilizing mechanism (4), wherein the stabilizing mechanism (4) is arranged in the middle of the outer wall of the gantry (1); The overload protection mechanism (3) comprises: A hanger (31), wherein the hanger (31) is arranged at the bottom end of the electric hoist (5); A gravity linkage component, the gravity linkage component being arranged in the inner cavity of the hanger (31), and the gravity linkage component being capable of performing corresponding actions according to the weight of the suspended object; A hook (37) is arranged at the bottom end of the gravity linkage assembly.

2. The electric controlled gantry crane according to claim 1, characterized in that: The gravity linkage assembly comprises: A support rod (33), the left and right ends of the support rod (33) being respectively arranged at the bottom ends of the left and right sides of the inner cavity of the hanger (31); A spring (34), wherein the spring (34) is sleeved on a middle portion of an outer wall of the support rod (33); Linkage blocks (35), the number of the linkage blocks (35) being two, the two linkage blocks (35) being slidably sleeved on the left and right sides of the outer wall of the support rod (33), and the left and right ends of the spring (34) being respectively clamped on the inner sides of the two linkage blocks (35); A first connecting rod (36), wherein the number of the first connecting rods (36) is two, the top ends of the two first connecting rods (36) are rotatably disposed at the bottom ends of the two linkage blocks (35) via pins, and the bottom ends of the two first connecting rods (36) are rotatably disposed at the left and right sides of the top end of the hook (37) via pins; A second connecting rod (38), wherein the number of the second connecting rods (38) is two, and the bottom ends of the two second connecting rods (38) are rotatably arranged at the top ends of the two linkage blocks (35) via pins; A push rod (39), wherein the left and right sides of the bottom end of the push rod (39) are rotatably arranged on the top ends of the two second connecting rods (38) via pins; An emergency stop switch (310) is arranged at the middle of the top end of the hanger (31), the position of the emergency stop switch (310) corresponds to the position of the push rod (39), and the emergency stop switch (310) is electrically connected to the electric hoist (5).

3. The electric controlled gantry crane according to claim 2, characterized in that: A limiting plate (32) is provided at the top end of the inner cavity of the hanger (31), and the top end of the outer wall of the push rod (39) can be slidably adapted to be inserted into the inner cavity of the limiting plate (32).

4. The electric controlled gantry crane according to claim 3, characterized in that: The stabilizing mechanism comprises: Lifting components, the number of the lifting components being two, and the two lifting components being respectively arranged on the left and right sides of the outer wall of the gantry (1); Stabilizing cables (49), the number of the stabilizing cables (49) is several, and the several stabilizing cables (49) are equally divided into two groups, the two ends of the two groups of stabilizing cables (49) are respectively arranged on the inner sides of the two lifting components, and the outer walls of the two groups of stabilizing cables (49) are respectively slidably arranged on the front and rear sides of the hanger (31).

5. The electric controlled gantry crane according to claim 4, characterized in that: The lifting assembly comprises: Racks (41), the number of the racks (41) being two, and the two racks (41) being respectively arranged on the left and right sides of the gantry (1); Support plates (42), the number of the support plates (42) being two, the two support plates (42) being slidably sleeved on the left and right sides of the outer wall of the gantry (1), and the two ends of the stabilizing cable (49) being respectively arranged on the inner sides of the two support plates (42); Slide blocks (43), the number of the slide blocks (43) being four, the four slide blocks (43) being respectively arranged at the front and rear sides of the inner cavity of the two support plates (42), the slide blocks (43) being slidably adapted to be plugged into the inner cavity of the slide groove (2); A connecting rod (44), wherein the front and rear ends of the connecting rod (44) are rotatably disposed at the front and rear inner ends of the inner cavity of the support plate (42) via bearings; A gear (45), wherein the gear (45) is sleeved on the outer wall of the connecting rod (44) and is locked by a top screw, and the gear (45) is meshed with the rack (41); A drive assembly, wherein the drive assembly is arranged in the inner cavity of the support plate (42).

6. The electric controlled gantry crane according to claim 5, characterized in that: The drive assembly comprises: A worm wheel (46), wherein the worm wheel (46) is sleeved on the outer wall of the connecting rod (44) and is locked by a top screw; A motor (47), the motor (47) being screw-connected to the bottom end of the support plate (42), and the motor (47) being electrically connected to the electric hoist (5); A worm (48), wherein the bottom end of the worm (48) is locked to the output end of the motor (47) through a coupling, and the top end of the worm (48) is rotatably extended into the inner cavity of the support plate (42), and the worm (48) is meshed with the worm wheel (46).

7. The electric controlled gantry crane according to claim 6, characterized in that: The distance between the top end of the push rod (39) and the bottom end of the emergency stop switch (310) is smaller than the length of the second connecting rod (38).

8. The electric controlled gantry crane according to claim 6, characterized in that: The cooperation between the gear (45) and the rack (41) causes the support plate (42) to move upward or downward, and positions the support plate (42).

9. The electric controlled gantry crane according to claim 6, characterized in that: The rotation of the worm (48) drives the gear (45) to rotate through the worm wheel (46) and the connecting rod (44), and the cooperation between the worm (48) and the worm wheel (46) prevents the gear (45) from driving the worm wheel (46) to rotate due to gravity.

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