A four-point box-type lifting device

Abstract

The present invention provides a four-point box-type sling, comprising: a fixed bracket, a rotary lock mechanism, a driving mechanism, a positioning component and a detection component; the rotary lock mechanism is distributed at four points of the fixed bracket; the positioning component is arranged around the fixed bracket, extending outward from the fixed bracket body, and is positioned by the positioning component and the frame beam of the box body to realize the X and Y direction constraints of the sling and the box body; the detection component is arranged at the four corners of the fixed bracket, and is used to judge whether the sling and the box body are in place after the positioning component is positioned; the driving mechanism is arranged on the fixed bracket, and is used to drive the rotary lock mechanism to rotate, so that the rotary lock mechanism is dragged under the box body frame to realize the Z direction locking of the sling and the box body. The present invention realizes full automation and intelligence, and avoids manual fixing of the rotary lock.

Description

Technical Field

[0001] The invention relates to the field of container lifting, and in particular to a four-point box-type lifting device. Background Art

[0002] At present, in the field of container lifting, container lifting fixtures use a four-point rotating manual lock method to hang the container and the lifting device on the lifting device, and then use the four sets of wire rope pulley winches on the gantry to lift the container vertically. There are the following problems: the use of manual locks cannot achieve automation, low efficiency, high labor costs, and long operation time; the wire rope winch winding is connected to the lifting device through four sets of pulleys, with a complex structure and high cost; the four-point suspension height cannot be adjusted horizontally, the driving method is single, and the wire rope winding method must be used to ensure the synchronization of the four points.

[0003] After searching, it was found that the Chinese patent with application number 200710194919.9 disclosed an automatic rotary lock device for container spreaders, including a rotary lock mechanism and a lock pin at the end of the spreader, and a solenoid valve for driving the lock pin. The controller, the spreader position sensor, the lock pin locking sensor and the lock pin unlocking sensor are respectively connected to the input end of the controller, and the solenoid valve is connected to the output end of the controller and connected to the lock pin. When the spreader is in the container position, the position sensor sends a container signal to the controller, and the controller outputs a control signal to the solenoid valve to drive the lock pin to lock, and the lock pin locking sensor and the lock pin unlocking sensor send a lock or unlock position signal to the controller. However, the above patent has a complex structure and high cost. Summary of the invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide a four-point box-type lifting device with simple structure, low cost and automation.

[0005] According to the present invention, a four-point box-type lifting device is provided, comprising: a fixed bracket, a rotary lock mechanism, a driving mechanism, a positioning component and a detection component; wherein,

[0006] The rotary lock mechanism is distributed at four points of the fixed bracket;

[0007] The positioning components are arranged around the fixing bracket and extend outward from the fixing bracket body. The positioning components are positioned with the frame beam of the box to be hoisted to realize the X and Y direction constraints between the lifting device and the box;

[0008] The detection components are arranged at the four corners of the fixing bracket, and are used to judge whether the lifting device and the box to be lifted are in place after the positioning component is positioned;

[0009] The driving mechanism is arranged on the fixed bracket, and is used for driving the rotary lock mechanism to rotate, so that the rotary lock mechanism is dragged under the frame beam, so as to realize the Z-direction locking of the hanger and the box.

[0010] Preferably, it also includes a suspension mechanism, which includes a suspension chain, a chain fixing seat, a screw half-gear ring, a pressure ball bearing and an adjusting screw; wherein,

[0011] The chain fixing seat is formed by connecting two symmetrical parts into one body, and has a containing space inside;

[0012] The screw half-gear ring and the pressure ball bearing are arranged in the chain fixing seat, wherein the screw half-gear ring is located above the pressure ball bearing, the pressure ball bearing is connected to the adjusting screw, and the screw half-gear ring is embedded in the screw groove of the adjusting screw;

[0013] The chain fixing seat is arranged at the bottom end of the suspension chain, and the suspension chain is connected to the adjusting screw;

[0014] The adjusting screw is arranged on the main beam of the fixing bracket.

[0015] Preferably, the suspension mechanism further comprises: an anti-sway docking rod, and the anti-sway docking rod is sleeved on the chain fixing seat and the outside of the suspension chain.

[0016] Preferably, the driving mechanism comprises: a rotating shaft, an electric push rod and an electric push rod connecting arm, the rotating shaft is arranged horizontally, the electric push rod is connected to the rotating shaft through the electric push rod connecting arm, and the electric push rod drives the rotating shaft to rotate;

[0017] A first rotating shaft connecting arm and a second rotating shaft connecting arm, wherein the first rotating shaft connecting arm and the second rotating shaft connecting arm are respectively arranged at two ends of the rotating shaft and connected to the rotating shaft, and the rotating shaft drives the rotating shaft connecting arms at both ends to rotate around the rotating shaft through the rotation of the rotating shaft;

[0018] A first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein one end of the first connecting rod and the second connecting rod is connected to the first rotating shaft connecting arm, and the first rotating shaft connecting arm drives the first connecting rod and the second connecting rod to rotate around the rotating shaft, and one end of the third connecting rod and the fourth connecting rod is connected to the second rotating shaft connecting arm, and the second rotating shaft connecting arm drives the third connecting rod and the fourth connecting rod to rotate around the rotating shaft;

[0019] Four padlock connecting arms, the four padlock connecting arms are respectively arranged at the bottom of the other end of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod, the four padlock connecting arms are arranged horizontally, and the four padlock connecting arms are driven to rotate radially through the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod;

[0020] The four padlock connecting arms are respectively connected to the rotary lock mechanisms at four points, and the rotary lock mechanisms are driven to rotate radially through the four padlock connecting arms, thereby realizing four-point synchronous drive full-automatic locking.

[0021] Preferably, a locking and unlocking position switch is also provided on the rotating shaft for detecting the angular position of the electric push rod connecting arm; the locking and unlocking position switch is fixed by a bracket, and the locking and unlocking position switch is parallel to the rotating shaft and perpendicular to the electric push rod connecting arm.

[0022] Preferably, the driving mechanism further comprises: a rotating shaft support bearing and a rotating shaft support bearing seat, the rotating shaft support bearing is arranged at both ends of the rotating shaft, and the rotating shaft support bearing is fixed to the fixed bracket through the rotating shaft support bearing seat.

[0023] Preferably, the rotary lock mechanism comprises:

[0024] A hook, the hook is located at the bottom end of the rotary lock mechanism, the hook is provided with a hook shaft, the hook can rotate along the hook shaft; the upper end of the hook shaft is provided with a keyway for connecting with the padlock connecting arm;

[0025] Hook bearings, two of which are connected to the hook shaft and are used to constrain the hook shaft in XY directions;

[0026] A pressure ball and a U-shaped anti-loosening nut, wherein the pressure ball is connected to the hook shaft, and the U-shaped anti-loosening nut is arranged above the pressure ball;

[0027] A hook bearing support seat, the hook bearing support seat has a accommodating space, a partition with a central through hole is provided in the accommodating space, and the partition divides the accommodating space into an upper space and a lower space; the hook bearing support seat is sleeved on the hook shaft, and the hook shaft passes through the central through hole of the partition, the two hook bearings are located in the lower space, and the pressure ball is located in the upper space; the upper end outer wall of the hook bearing support seat is provided with a circle of outer edge for fixing with the fixed bracket.

[0028] Preferably, the positioning component includes four guide blocks, and the four guide blocks are divided into two groups of guide blocks, and each group of guide blocks is symmetrically arranged on both sides of the fixing bracket.

[0029] Preferably, the guide block includes a connecting plate, and two ribs are provided above the connecting plate; the connecting plate is fixed to the bottom surface of the side of the fixed frame, and the two ribs are clamped on the outer ridge of the side of the fixed frame; a downwardly extending protrusion is provided below the connecting plate, and one side edge of the protrusion and the bottom surface of the connecting plate form an L-shaped slot for socketing the frame beam; the lower end of the protrusion is a conical structure.

[0030] Preferably, the detection component is a detection position switch.

[0031] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0032] The device of the present invention is fully automated and intelligent, and avoids manual fixing of the rotary lock.

[0033] The device of the present invention has four-point suspension height that can be adjusted, and the driving device adopts a single push rod to control the rotation of the odd and even strands of the rotary lock at four points, which has low cost and high efficiency.

[0034] The above-mentioned device of the present invention adopts a suspension mechanism with good applicability, can be applicable to various box hoisting, and can be applicable to various lifting and hoisting systems, such as wire rope hoisting system and chain hoist.

[0035] The device of the present invention has high safety and reliability because the height and the lock position are detected by setting a switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1 It is a structural schematic diagram of a hanger in a preferred embodiment of the present invention;

[0038] Figure 2a It is a structural schematic diagram of a box in a preferred embodiment of the present invention;

[0039] Figure 2b for Figure 2a A partial schematic diagram of

[0040] Figure 3 It is an exploded schematic diagram of the connection between the hanger and the box in a preferred embodiment of the present invention;

[0041] Figure 4 It is a schematic diagram of the connection between the sling and the box in a preferred embodiment of the present invention;

[0042] Figure 5 It is a schematic diagram of the structural decomposition of the suspension mechanism in a preferred embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the structural decomposition of the rotary lock mechanism in a preferred embodiment of the present invention;

[0044] Figure 7a It is a structural schematic diagram of a hanger in a preferred embodiment of the present invention;

[0045] Figure 7b for Figure 7a Bottom view of

[0046] Figure 7c for Figure 7a Schematic diagram of the assembly process;

[0047] The symbols in the figure are respectively represented as: fixed bracket 1, rotary lock mechanism 2, suspension mechanism 4, box to be lifted 7, electric push rod 301, electric push rod connecting arm 302, lock and unlock position switch 303, rotating shaft 304, rotating shaft support bearing 305, first connecting rod 306a, second connecting rod 306d, third connecting rod 306b, fourth connecting rod 306c, first rotating shaft connecting arm 307a, second rotating shaft connecting arm 307b, first padlock connecting arm 308a, third padlock connecting arm 308b, hook 201, hook bearing support seat 202, hook bearing 203, hook shaft 204, pressure ball 205, U-shaped anti-loosening nut 206, chain fixing seat 401, screw half-gear ring 402, pressure ball bearing 403, adjusting screw 404, anti-sway docking rod 405, guide block 501, detection position switch 601, frame beam 701, first shell 801, second shell 802, third shell 803, fourth shell 804, fifth shell 805. DETAILED DESCRIPTION

[0048] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0049] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] Reference Figure 1-7cAs shown, it is a structural schematic diagram of a four-point box-type sling of a preferred embodiment of the present invention, the sling includes a fixed bracket 1, four rotary lock mechanisms 2, a driving mechanism, a positioning component and a detection component; wherein, the four rotary lock mechanisms 2 are distributed at four points of the fixed bracket 1; the positioning component is arranged around the fixed bracket 1, extending outward from the main body of the fixed bracket 1, and is positioned with the frame beam 701 of the box body 7 to be lifted by the positioning component, so as to realize the X and Y direction constraints of the sling and the box body 7 to be lifted; the detection component is arranged at the four corners of the fixed bracket 1, and is used to judge whether the four corners of the sling and the box body 7 are in place after the positioning component is positioned; the driving mechanism 3 is arranged on the fixed bracket 1, and is used to drive the rotary lock mechanism 2 to rotate, so that the hook at the bottom of the rotary lock mechanism 2 is dragged under the frame beam 701, so as to realize the Z direction locking of the sling and the box body 7 to be lifted.

[0051] Reference Figure 1 As shown, the detection components are four detection position switches 601, and the four detection position switches 601 are respectively vertically arranged at the four corners of the fixed bracket 1. Two horizontal brackets are respectively installed at both ends of the fixed bracket 1, and the four detection position switches 601 are respectively installed on the two horizontal brackets and located at the four corners of the fixed bracket 1. The four detection position switches 601 can sense their positions by facing the main beam of the frame vertically.

[0052] Reference Figure 2a , 2b As shown, the box body 7 to be hoisted includes a frame beam 701 located at the upper part, which is used to connect with the hoist. The frame beam 701 can be any frame, such as Figure 2b The main beam of the rectangular frame shown can form a locking structure with the rotary lock mechanism 2, without the need to add an additional locking support that matches the rotary lock mechanism 2.

[0053] Reference Figure 3 , Figure 4 As shown, the shape of the fixing bracket 1 is a rectangular parallelepiped frame structure, which matches the shape of the frame beam 701. The size of the fixing bracket 1 is slightly smaller than the frame beam 701, so that the periphery of the fixing bracket 1 is positioned on the box frame beam 701 through a positioning component.

[0054] The above embodiment does not need to add additional locking supports to match the rotary lock mechanism 2 to the lifting box 7. The rotary lock mechanism 2 can be directly towed under the frame beam 701 to achieve Z-axis locking. The X and Y directions are constrained by the positioning components on all sides. Before the sling fits the box 7 to be lifted, the XY guide takes precedence over the box 7 to produce a positioning effect. The positioning component can position the sling within an error of + / -100mm to achieve a wide range of error positioning. After the sling fits the box 7 in place, four detection in-place switches 601 (i.e., detection components) are configured at four points. The sling is determined to be in place through the four-point switches, and the drive mechanism 3 can be started to drive the rotary lock mechanism 2 to rotate 90 degrees, so that the rotary lock mechanism 2 is towed under 701.

[0055] In other preferred embodiments, refer to Figure 5 As shown, it also includes four suspension mechanisms 4, each of which includes a suspension chain, a chain fixing seat 401, a screw half-gear ring 402, a pressure ball bearing 403 and an adjusting screw 404; wherein,

[0056] The chain fixing seat 401 is composed of two symmetrical parts connected together to form an integral body, and has a accommodating space inside; the screw half-gear ring 402 and the pressure ball bearing 403 are arranged in the chain fixing seat 401, wherein the screw half-gear ring 402 is located above the pressure ball bearing 403, the pressure ball bearing 403 is connected to the adjusting screw 404, and the screw half-gear ring 402 is embedded in the screw groove of the adjusting screw 404 for limiting; the chain fixing seat 401 is arranged at the bottom end of the suspension chain, and the suspension chain is connected to the adjusting screw 404; the adjusting screw 404 is arranged on the main beam of the fixed bracket 1.

[0057] The four suspension points of the four suspension mechanisms 4 can be connected by a standard hoisting hoist hook method. The four suspension mechanisms 4 are connected to the main beam of the fixed bracket 1 through four adjusting screws 404, respectively, and can be adjusted within a certain range in the Z direction without disassembling the chain, which overcomes the problem that the four-point suspension height cannot be adjusted horizontally. The suspension chain is used in the suspension mechanism 4, and the suspension chain can float in any direction, further cooperating with the positioning of the sling.

[0058] Further, refer to Figure 7a , Figure 7b and Figure 7c As shown, the suspension mechanism 4 also includes four anti-sway docking rods 405, which are sleeved on the chain fixing seat 401 and the outside of the suspension chain, and the bottom of the anti-sway docking rod 405 is fixed to the fixing bracket 1 by bolts. In the process of lifting, it plays a role in preventing the suspension chain from swinging.

[0059] In other preferred embodiments, the driving mechanism 3 includes: a rotating shaft 304, an electric push rod 301 and an electric push rod connecting arm 302, the electric push rod 301 is connected to the rotating shaft 304 through the electric push rod connecting arm 302; the rotating shaft 304 is horizontally arranged, and the electric push rod 301 drives the rotating shaft 304 to rotate.

[0060] The first rotating shaft connecting arm 307a and the second rotating shaft connecting arm 307b are respectively arranged at two ends of the rotating shaft 304 and connected to the rotating shaft 304. The rotating shaft 304 rotates to drive the rotating shaft connecting arms at both ends to rotate around the rotating shaft 304.

[0061] A first connecting rod 306a, a second connecting rod 306d, a third connecting rod 306b and a fourth connecting rod 306c, wherein the first connecting rod 306a and the second connecting rod 306d are respectively arranged perpendicular to the rotating shaft 304, one end of the first connecting rod 306a and the second connecting rod 306d are connected to the first rotating shaft connecting arm 307a, and the first rotating shaft connecting arm 307a drives the first connecting rod 306a and the second connecting rod 306d to rotate around the rotating shaft 304;

[0062] The third link 306b and the fourth link 306c are respectively arranged perpendicular to the rotating shaft 304, and one end of the third link 306b and the fourth link 306c are connected to the second rotating shaft connecting arm 307b, and the third link 306b and the fourth link 306c are driven to rotate around the rotating shaft 304 through the second rotating shaft connecting arm 307b.

[0063] The first padlock connecting arm 308a, the second padlock connecting arm 308d, the third padlock connecting arm 308b and the fourth padlock connecting arm 308c (not shown in the figure), wherein the first padlock connecting arm 308a is arranged horizontally and connected to the bottom of the other end of the first connecting rod 306a; the second padlock connecting arm 208d is arranged horizontally and connected to the bottom of the other end of the second connecting rod 306d; the third padlock connecting arm 308b is arranged horizontally and connected to the bottom of the other end of the third connecting rod 306b; the fourth padlock connecting arm 308c (not shown in the figure) is arranged horizontally and connected to the bottom of the other end of the fourth connecting rod 306c; the four padlock connecting arms are driven to rotate radially by the first connecting rod 306a, the second connecting rod 306d, the third connecting rod 306b and the fourth connecting rod 306c respectively; the four padlock connecting arms are respectively connected to the four-point rotary lock mechanism 2, and the rotary lock mechanism 2 is driven to rotate radially by the four padlock connecting arms, thereby realizing four-point synchronous drive full-automatic locking.

[0064] In the specific implementation process, the hook 201 of the rotary lock mechanism 2 is horizontally arranged with the box frame beam 701, and the driving mechanism 3 drives the hook 201 to rotate 90 degrees to be perpendicular to the box frame beam 701 to achieve Z-direction locking.

[0065] In other preferred embodiments, the driving mechanism 3 further includes: two rotating shaft support bearings 305 and two rotating shaft support bearing seats. The two rotating shaft support bearings 305 are respectively arranged at the two ends of the rotating shaft 304, and the two rotating shaft support bearings 305 are respectively fixed to the fixed bracket 1 through the two rotating shaft support bearing seats. Furthermore, a locking and unlocking position switch 303 is also provided on the rotating shaft 304. The locking and unlocking position switch 303 is used to detect the angular position of the connecting arm (metal sensing). The locking and unlocking position switch 303 is fixed by the bracket, and the position of the locking and unlocking position switch 303 can be adjusted, refer to Figure 1 As shown, the lock and unlock position switch 303 is parallel to the rotating shaft 304 and can sense its position by facing the connecting arm vertically.

[0066] In other preferred embodiments, refer to Figure 6 As shown, the rotary lock mechanism 2 includes: a hook 201, the hook 201 is located at the bottom end of the rotary lock mechanism 2, a hook shaft 204 is provided on the hook 201, and the hook 201 can rotate along the hook shaft 204; a keyway is provided at the upper end of the hook shaft 204 for connecting with the padlock connecting arm; two hook bearings 203, the two hook bearings 203 are connected to the hook shaft 204, and are used to constrain the hook shaft 204 in the XY direction; the rotary lock mechanism 2 is supported by bearings, which is flexible in rotation, prolongs the service life and improves the operating efficiency. Pressure ball 205 and U-shaped anti-loosening nut 206, pressure ball 205 is connected with hook shaft 204, U-shaped anti-loosening nut 206 is arranged above pressure ball 205; hook bearing support seat 202, hook bearing support seat 202 has a containing space, a partition with a central through hole is arranged in the containing space, and the partition divides the containing space into an upper space and a lower space; hook bearing support seat 202 is sleeved on hook shaft 204, hook shaft 204 passes through the central through hole of the partition, two hook bearings 203 are located in the lower space, and pressure ball 205 is located in the upper space; the upper end outer wall of hook bearing support seat 202 is provided with an outer edge for fixing with fixing bracket 1. In other embodiments, pressure ball 205 can also be replaced with needle bearing.

[0067] In other preferred embodiments, the positioning component includes four guide blocks 501, which are divided into two groups of guide blocks 501, and each group of guide blocks 501 is symmetrically arranged on both sides of the fixed bracket 1. Specifically, the guide blocks 501 include a connecting plate, and two ribs are arranged above the connecting plate; the connecting plate is fixed to the bottom surface of the side of the fixed frame, and the two ribs are clamped on the outer ridges of the side of the fixed frame; a downwardly extending protrusion is arranged below the connecting plate, and one side of the protrusion and the bottom surface of the connecting plate form an L-shaped slot for inserting and plugging the frame main beam of the box body 7; the lower end of the protrusion is a tapered structure, which plays a guiding role.

[0068] In other preferred embodiments, refer to Figure 7b , Figure 7c As shown, the sling also includes a first shell 801, a second shell 802, a third shell 803, a fourth shell 804 and a fifth shell 805. Figure 7cAs shown, the first shell 801, the second shell 802, the third shell 803, the fourth shell 804 and the fifth shell 805 are respectively assembled on the respective components above the fixed bracket 1, the first shell 801 and the fifth shell 805 are respectively installed above the detection component and fixed to the fixed bracket 1 by bolts, the second shell 802, the third shell 803 and the fourth shell 804 are respectively installed above the driving component and fixed to the fixed bracket 1 by bolts, the detection component and the driving component are accommodated inside the shell and isolated from the external environment, which plays a protective role and prolongs the service life.

[0069] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A four-point box-type sling, characterized in that: include: Fixed bracket, rotary lock mechanism, driving mechanism, positioning component and detection component; wherein, The rotary lock mechanism is distributed at four points of the fixed bracket; The positioning components are arranged around the fixing bracket and extend outward from the fixing bracket body. The positioning components are positioned with the frame beam of the box to be hoisted to realize the X and Y direction constraints between the hoist and the box; The detection components are arranged at the four corners of the fixing bracket, and are used to judge whether the lifting device and the box to be lifted are in place after the positioning component is positioned; The driving mechanism is arranged on the fixed bracket, and is used to drive the rotary lock mechanism to rotate, so that the rotary lock mechanism is dragged under the frame beam to achieve Z-direction locking of the sling and the box body; It also includes a suspension mechanism, which includes a suspension chain, a chain fixing seat, a screw half-gear ring, a pressure ball bearing and an adjusting screw; wherein, The chain fixing seat is formed by connecting two symmetrical parts into one body, and has a containing space inside; The screw half-gear ring and the pressure ball bearing are arranged in the chain fixing seat, wherein the screw half-gear ring is located above the pressure ball bearing, the pressure ball bearing is connected to the adjusting screw, and the screw half-gear ring is embedded in the screw groove of the adjusting screw; The chain fixing seat is arranged at the bottom end of the suspension chain, and the suspension chain is connected to the adjusting screw; The adjusting screw is arranged on the main beam of the fixing bracket; The suspension mechanism further comprises: an anti-sway docking rod, the anti-sway docking rod being sleeved on the chain fixing seat and the outside of the suspension chain; The driving mechanism comprises: a rotating shaft, an electric push rod and an electric push rod connecting arm, the rotating shaft is arranged horizontally, the electric push rod is connected to the rotating shaft through the electric push rod connecting arm, and the electric push rod drives the rotating shaft to rotate; A first rotating shaft connecting arm and a second rotating shaft connecting arm, wherein the first rotating shaft connecting arm and the second rotating shaft connecting arm are respectively arranged at two ends of the rotating shaft and connected to the rotating shaft, and the rotating shaft drives the rotating shaft connecting arms at both ends to rotate around the rotating shaft through the rotation of the rotating shaft; A first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein one end of the first connecting rod and the second connecting rod is connected to the first rotating shaft connecting arm, and the first rotating shaft connecting arm drives the first connecting rod and the second connecting rod to rotate around the rotating shaft, and one end of the third connecting rod and the fourth connecting rod is connected to the second rotating shaft connecting arm, and the second rotating shaft connecting arm drives the third connecting rod and the fourth connecting rod to rotate around the rotating shaft; Four padlock connecting arms, the four padlock connecting arms are respectively arranged at the bottom of the other end of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod, the four padlock connecting arms are arranged horizontally, and the four padlock connecting arms are driven to rotate radially through the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod; The four padlock connecting arms are respectively connected to the rotary lock mechanisms at four points, and the rotary lock mechanisms are driven to rotate radially through the four padlock connecting arms, thereby realizing four-point synchronous drive full-automatic locking.

2. A four-point box-type sling according to claim 1, characterized in that: The rotating shaft is also provided with a locking and unlocking position switch for detecting the angular position of the electric push rod connecting arm; the locking and unlocking position switch is fixed by a bracket, and the locking and unlocking position switch is parallel to the rotating shaft and perpendicular to the electric push rod connecting arm.

3. A four-point box-type sling according to claim 1, characterized in that: The driving mechanism further includes: a rotating shaft support bearing and a rotating shaft support bearing seat, wherein the rotating shaft support bearing is arranged at both ends of the rotating shaft, and the rotating shaft support bearing is fixed to the fixing bracket through the rotating shaft support bearing seat.

4. A four-point box-type sling according to claim 1, characterized in that: The rotary lock mechanism comprises: A hook, the hook is located at the bottom end of the rotary lock mechanism, the hook is provided with a hook shaft, the hook can rotate along the hook shaft; the upper end of the hook shaft is provided with a keyway for connecting with the padlock connecting arm; Hook bearings, two of which are connected to the hook shaft and are used to constrain the hook shaft in XY directions; A pressure ball and a U-shaped anti-loosening nut, wherein the pressure ball is connected to the hook shaft, and the U-shaped anti-loosening nut is arranged above the pressure ball; The hook bearing support seat has a accommodating space, in which a partition with a central through hole is provided, and the partition divides the accommodating space into an upper space and a lower space; the hook bearing support seat is sleeved on the hook shaft, and the hook shaft passes through the central through hole of the partition, the two hook bearings are located in the lower space, and the pressure ball is located in the upper space; the upper end outer wall of the hook bearing support seat is provided with a circle of outer edge for fixing with the fixed bracket.

5. A four-point box-type sling according to any one of claims 1-4, characterized in that: The positioning component includes four guide blocks, and the four guide blocks are divided into two groups of guide blocks. The guide blocks in each group are symmetrically arranged on both sides of the fixing bracket.

6. A four-point box-type sling according to claim 5, characterized in that: The guide block includes a connecting plate, and two ribs are arranged above the connecting plate; the connecting plate is fixed to the bottom surface of the side of the fixed frame, and the two ribs are clamped on the outer ridges of the side of the fixed frame; A downwardly extending protrusion is provided below the connecting plate, and one side of the protrusion and the bottom surface of the connecting plate form an L-shaped slot for receiving and inserting the frame beam; the lower end of the protrusion is a conical structure.

7. A four-point box-type sling according to any one of claims 1-4, characterized in that: The detection component is a detection position switch.

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