Automatic switching and connecting device for electric lifting appliance

Abstract

The invention relates to the field of electric lifting appliances, and particularly discloses an automatic conversion connecting device for an electric lifting appliance, which comprises an upper connecting mechanism and a lower connecting mechanism, the upper connecting mechanism comprises a locking assembly, a fixed seat and an upper mounting plate, the fixed seat is fixedly connected with the upper mounting plate, the locking assembly is mounted on the upper mounting plate and comprises a driving part, a moving plate, a bolt, a connecting plate, a rotating shaft and a locking plate, the driving part is fixed on the fixed seat, and a driving part of the driving part is in linkage connection with the moving plate to drive the moving plate to move; a limiting hole is formed in the connecting plate, the bolt is fixedly connected with the moving plate and inserted into the limiting hole, the rotating shaft penetrates through the upper mounting plate and the connecting plate and is fixedly connected with the rotating shaft, the moving plate is in linkage fit with the rotating shaft through the bolt and the connecting plate, and the locking plate is fixedly connected to the end, facing the lower connecting mechanism, of the rotating shaft. The lower connecting mechanism comprises a lower mounting plate, and a locking insertion hole corresponding to the locking plate is formed in the lower mounting plate.

Description

Technical Field

[0001] The invention relates to the field of electric spreaders, and in particular to an automatic conversion connection device for electric spreaders. Background Art

[0002] Electric spreaders are divided into various types according to the objects they are lifted. The main ones used in metallurgical steel plants are: slab spreaders, steel coil spreaders, roll spreaders, etc. Electric spreaders are mainly composed of: main hanger, hanging beam body, connecting parts, transmission mechanism, electrical control system and other parts.

[0003] Existing, a sling used on a dock crane with a patent application number of CN201520193566.0 includes an upper sling body and a lower sling body, wherein a circular hole is provided in the middle of the upper sling body and the lower sling body, and a connecting shaft passes through the circular hole of the upper sling body and the circular hole of the lower sling body in turn, and its upper end is arranged on the upper sling body through a fixing part, and bearings are provided at the connection between the connecting shaft and the upper and lower sling bodies.

[0004] As mentioned above, the connection between the upper hoist body and the lower hoist body in the existing electric hoist is usually achieved only by a connecting shaft at the center passing through the two. When bearing heavy objects or dynamic loads, this connection method may become loose or damaged due to uneven force or vibration. It lacks sufficient stability, and if the connecting shaft or bearing fails, it may be necessary to disassemble the entire hoist body for repair or replacement, which increases the complexity and cost of maintenance. Due to insufficient connection stability and wear problems, this connection method may pose a safety hazard. In extreme cases, it may cause the hoisted object to fall off or the crane to lose control, resulting in serious consequences. Summary of the invention

[0005] The invention provides an automatic conversion connection device for an electric spreader to solve the technical problems in the prior art of lack of sufficient stability, high maintenance cost and low safety.

[0006] In order to solve the above problems, the present invention provides an automatic conversion connection device for electric spreaders, which adopts the following technical solution: comprising an upper connection mechanism and a lower connection mechanism;

[0007] The upper connecting mechanism includes a locking assembly, a fixed seat and an upper mounting plate, the fixed seat and the upper mounting plate are fixedly connected, the locking assembly is installed on the upper mounting plate, the locking assembly includes a driving member, a moving plate, a latch, a connecting plate, a rotating shaft, and a locking plate, the driving member is fixed on the fixed seat, the driving part of the driving member is linked to the moving plate to drive the moving plate to move, a limited hole is arranged on the connecting plate, the latch is fixedly connected to the moving plate and the latch is inserted in the limited hole, the rotating shaft passes through the upper mounting plate, the connecting plate is fixedly connected to the rotating shaft, the moving plate is linked with the rotating shaft through the latch, the connecting plate and the rotating shaft, so that the movement of the moving plate can drive the rotating shaft, and the locking plate is fixedly connected to one end of the rotating shaft toward the lower connecting mechanism;

[0008] The lower connecting mechanism comprises a lower mounting plate, on which a locking socket corresponding to the locking plate is arranged.

[0009] Furthermore, the movable plate includes a fixing portion, a mounting portion, and a connecting portion, wherein the connecting portion is located on the top end surface of the fixing portion, the driving portion of the driving member is connected to the link, the mounting portion is located on the side wall of the fixing portion, and the latch is installed on the mounting portion.

[0010] Furthermore, a slide rail is provided on the upper mounting plate, and the movable plate is slidably mounted on the upper mounting plate via the slide rail.

[0011] Furthermore, the upper connecting mechanism also includes a limiting member, which is located at the front end and / or the rear end of the movable plate to limit the movable range of the movable plate.

[0012] Furthermore, along the vertical direction, there is a gap between the fixing seat and the upper mounting plate, the locking assembly is installed between the fixing seat and the upper mounting plate, and the lower connecting mechanism is located below the upper mounting plate.

[0013] Furthermore, the rotating shaft, connecting plate, latch, locking plate, and locking socket each include two groups and correspond one to one, the two groups of rotating shafts are respectively located on both sides of the horizontal center axis of the movable plate, and the two groups of connecting plates are symmetrically distributed on both sides of the horizontal center axis of the movable plate.

[0014] Further, the length of the locking plate is greater than its width; or, the length of the locking plate is smaller than its width.

[0015] Furthermore, a plug assembly is installed on the lower mounting plate, and the plug assembly is used to be electrically connected to a device that needs power supply. A socket that plugs and cooperates with the plug assembly is installed on the upper mounting plate, and the socket is electrically connected to the power supply.

[0016] Furthermore, the plug assembly includes an electrical connection contact, a spring, and a shell. The spring and the shell are sequentially mounted on the outer circumference of the electrical contact from the inside to the outside. The shell is fixedly connected to the lower mounting plate. The upper and lower ends of the spring are respectively abutted against the shell and the electrical contact. The electrical connection contact includes an extending end, which is in electrical contact with the socket and extends out of the shell.

[0017] Furthermore, a guide plate matching the lower mounting plate is provided on one side of the upper mounting plate facing the lower connecting mechanism, and an end of the guide plate away from the upper mounting plate is provided as an inverted funnel-shaped structure.

[0018] The beneficial effects of the automatic conversion connection device for electric spreaders provided by the present invention are:

[0019] 1. When the driving member starts and drives the moving plate to move linearly, the latch moves with the moving plate. Since the latch is inserted into the limiting hole, it can adapt to the rotation of the connecting plate and maintain a linkage relationship with the connecting plate through the limiting hole;

[0020] 2. As the bolt moves, the connecting plate is driven, and then the rotation of the rotating shaft is realized through the fixed connection. The rotation of the rotating shaft finally drives the locking plate to swing, and the locking plate cooperates with the locking socket of the lower connecting mechanism to realize the locking or unlocking function;

[0021] 3. The device realizes the automation of locking and unlocking functions through precise control of the driving parts, which can effectively improve work efficiency, reduce the complexity of manual operation, and has high space utilization while maintaining good stability and reliability and being able to withstand large loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0023] Figure 1 It is a structural schematic diagram of an automatic conversion connection device for an electric spreader of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an upper connection mechanism of an automatic conversion connection device for an electric spreader of the present invention;

[0025] Figure 3 It is a schematic diagram of the top view of the upper connection mechanism of the automatic conversion connection device of an electric spreader of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a movable plate of an automatic conversion connection device for an electric spreader of the present invention;

[0027] Figure 5 It is a bottom view structural schematic diagram of an upper connection mechanism of an automatic conversion connection device for an electric spreader of the present invention;

[0028] Figure 6It is a structural schematic diagram of a lower connection mechanism of an automatic conversion connection device for an electric spreader of the present invention;

[0029] Figure 7 The present invention is a schematic cross-sectional structural diagram of a plug assembly of an automatic conversion connection device for an electric hoist.

[0030] Description of reference numerals:

[0031] 1. Upper connecting mechanism; 11. Locking assembly; 111. Driving member; 112. Moving plate; 1121. Fixing part; 1122. Mounting part; 1123. Connecting part; 113. Latch; 114. Connecting plate; 1141. Limiting hole; 115. Rotating shaft; 116. Locking plate; 12. Fixed seat; 13. Upper mounting plate; 131. Slide rail; 132. Guide plate; 14. Limiting member; 141. Movable slot; 15. Socket;

[0032] 2. Lower connecting mechanism; 21. Plug assembly; 211. Electrical connection contact; 212. Spring; 213. Housing; 22. Lower mounting plate; 221. Locking socket. DETAILED DESCRIPTION

[0033] 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. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0035] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0036] The present invention provides an automatic switching connection device for electric spreaders, such as Figures 1 to 3 As shown, it includes an upper connecting mechanism 1 and a lower connecting mechanism 2.

[0037] In this embodiment, the upper connection mechanism 1 is responsible for connecting with the upper hoisting equipment or structure, and has the function of locking and releasing the lower connection mechanism 2 .

[0038] In this embodiment, the upper connecting mechanism 1 includes a locking assembly 11, a fixed seat 12 and an upper mounting plate 13, the fixed seat 12 and the upper mounting plate 13 are fixedly connected, the locking assembly 11 is installed on the upper mounting plate 13, the locking assembly 11 includes a driving member 111, a moving plate 112, a latch 113, a connecting plate 114, a rotating shaft 115, and a locking plate 116, the driving member 111 is fixed on the fixed seat 12, and the driving part of the driving member 111 is linked to the moving plate 112 to drive the moving plate 112 to move A limiting hole 1141 is provided on the connecting plate 114, the latch 113 is fixedly connected to the movable plate 112 and the latch 113 is inserted into the limiting hole 1141, the rotating shaft 115 passes through the upper mounting plate 13, the connecting plate 114 is fixedly connected to the rotating shaft 115, and the movable plate 112 cooperates with the rotating shaft 115 through the latch 113, the connecting plate 114 and the rotating shaft 115, so that the movement of the movable plate 112 can drive the rotating shaft 115, and the locking plate 116 is fixedly connected to one end of the rotating shaft 115 facing the lower connecting mechanism 2.

[0039] In this embodiment, the fixing seat 12 is fixedly connected to the upper mounting plate 13 as the support base of the entire upper connecting mechanism 1, providing an installation position for other components. In this embodiment, the upper mounting plate 13 is fixedly connected to the fixing seat 12 by bolts, providing an installation platform for the locking assembly 11.

[0040] In this embodiment, in the locking assembly 11, the driving member 111 is the main power source, and the movable plate 112 moves linearly under the drive of the driving member 111. The pin 113 is fixedly connected to the movable plate 112 and can move with the movement of the movable plate 112. The pin 113 is connected to the connecting plate 114 through the limiting hole 1141, allowing the pin 113 to have a certain degree of freedom of movement and rotation in the limiting hole 1141. When the movable plate 112 drives the pin 113 to move, the pin 113 can slide in the limiting hole 1141, thereby driving the connecting plate 114 and the rotating shaft 115 connected thereto to rotate. The setting of the limiting hole 1141 enables the connecting plate 114 to adapt to the angle change with the rotation of the rotating shaft 115, which can effectively increase the flexibility and adaptability of the locking assembly 11.

[0041] In this embodiment, the limiting hole 1141 is a bar-shaped hole.

[0042] In this embodiment, when the driving member 111 is started and drives the moving plate 112 to move linearly, the latch 113 moves with the moving plate 112. Since the latch 113 is inserted in the limiting hole 1141, it can adapt to the rotation of the connecting plate 114 and maintain a linkage relationship with the connecting plate 114 through the limiting hole 1141. With the movement of the latch 113, the connecting plate 114 is driven, and then the rotation of the rotating shaft 115 is realized through the fixed connection. The rotation of the rotating shaft 115 finally drives the locking plate 116 to swing, and the locking plate 116 cooperates with the locking socket (described below) of the lower connecting mechanism 2 to realize the locking or unlocking function.

[0043] In other embodiments, the driving member 111 may be a motor, a cylinder, or other devices capable of generating linear or rotational motion.

[0044] It should be noted that the moving distance and direction of the moving plate 112 are determined by the output characteristics of the driving member 111 , and the material and structure of the moving plate 112 must ensure its rigidity and guidance to ensure that it can move smoothly and accurately.

[0045] In this embodiment, the movable plate 112 includes a fixing portion 1121, an installation portion 1122, and a connecting portion 1123. The connecting portion 1123 is located on the top end surface of the fixing portion 1121, the driving portion of the driving member 111 is connected to the link, the installation portion 1122 is located on the side wall of the fixing portion 1121, and the pin 113 is installed on the installation portion 1122.

[0046] In this embodiment, the fixing portion 1121 is the basic structure of the movable plate 112, which is mainly used to provide stable support and positioning functions to ensure that the movable plate 112 can remain stable when subjected to driving force and does not deform or displace; the mounting portion 1122 is located on the side wall of the fixing portion 1121, and is the mounting position of the latch 113. The mounting portion 1122 is configured to be a boss or bracket protruding from the side wall of the fixing portion 1121 to facilitate the installation and fixation of the latch 113, ensuring that the latch 113 can remain stable during movement and will not fall off due to vibration or impact, and a socket is designed on the mounting portion 1122 for firmly mounting the latch 113 on the movable plate 112; the connecting portion 1123 is located on the top end surface of the fixing portion 1121, and is the connecting point between the driving member 111 and the movable plate 112. Through the connecting portion 1123, the driving member 111 can transmit the driving force to the movable plate 112, so that it moves in a predetermined direction.

[0047] In this embodiment, when the driving member 111 is started, its driving part cooperates with the connecting part 1123 of the movable plate 112 to transmit the driving force to the movable plate 112. After receiving the driving force, the movable plate 112 moves along a predetermined direction through the stable support and positioning function provided by the fixing part 1121. At the same time, the pin 113 installed on the installation 1122 cooperates with the limiting hole 1141 on the connecting plate 114 and slides with the movement of the movable plate 112.

[0048] In this embodiment, the upper mounting plate 13 is provided with a slide rail 131, and the movable plate 112 is slidably mounted on the upper mounting plate 13 through the slide rail 131. In this embodiment, the movable plate 112 cooperates with the slide rail 131 through the slide groove or slider at the bottom thereof to form a sliding connection, thereby realizing a slidable installation on the upper mounting plate 13, allowing the movable plate 112 to perform a linear motion under the guidance of the slide rail 131 without deflection or shaking, and the slide rail 131 not only provides a sliding path for the movable plate 112, but also plays a role in guiding and positioning, ensuring that the movable plate 112 always maintains a correct position and posture during the sliding process.

[0049] It should be noted that when the device is in use, the upper mounting plate 13 is usually fixed and does not move, providing a mounting base for other components.

[0050] In other embodiments, the mobile plate 112 may be installed with various functional components, such as sensors, actuators, etc., as needed.

[0051] In this embodiment, when the driving member 111 is started, its driving part transmits power to the movable plate 112 through the connecting part 1123 thereof. Under the action of the power, the movable plate 112 begins to move linearly along the slide rail 131. Due to the precise guiding and positioning function of the slide rail 131, the movable plate 112 can be moved smoothly and accurately to the predetermined position.

[0052] In other embodiments, the slide rail 131 is fixedly mounted on the surface of the upper mounting plate 13 by bolt connection, welding or other fastening methods.

[0053] In this embodiment, the upper connecting mechanism 1 further includes a limiter 14, which is located at the front end and / or rear end of the movable plate 112 to limit the movable range of the movable plate 112. The setting of the limiter 14 can effectively increase the safety of the locking assembly 11 and prevent damage or danger caused by excessive movement of the movable plate 112. In this embodiment, the limiter 14 includes two groups, and the two groups of limiters 14 are respectively located at the front end and rear end of the movable plate 112. The limiter 14 is fixedly mounted on the side wall of the upper mounting plate 13 by welding. When the driving member 111 starts and drives the movable plate 112 to slide along the slide rail 131, the movable plate 112 will be limited by the limiter 14. When the front end or rear end of the movable plate 112 contacts the limiter 14, the limiter 14 will prevent it from continuing to move, thereby ensuring that the movable plate 112 remains within the predetermined range of motion.

[0054] In this embodiment, the limiting member 14 includes a movable groove 141 for accommodating the movable plate 112. One end of the movable plate 112 is always located in the movable groove 141, which can ensure that the movable plate 112 always maintains the correct position and posture during the sliding process, thereby improving the accuracy of the locking assembly 11.

[0055] In this embodiment, the arrangement of the slide rail 131 and the stopper 14 can ensure the smooth and accurate movement of the moving plate 112, thereby effectively improving the energy transfer efficiency.

[0056] In this embodiment, along the vertical direction, there is a gap between the fixing seat 12 and the upper mounting plate 13, the locking assembly 11 is installed between the fixing seat 12 and the upper mounting plate 13, and the lower connecting mechanism 2 is located below the upper mounting plate 13. In this embodiment, the fixing seat 12 and the upper mounting plate 13 are the main supporting components in the structure, and the locking assembly 11 is installed between the fixing seat 12 and the upper mounting plate 13. The various parts cooperate with each other through ingenious design, so as to achieve the stability and accuracy of the structure and maximize the space utilization.

[0057] In this embodiment, the rotating shaft 115, the connecting plate 114, the latch 113, the locking plate 116, and the locking socket are respectively included in two groups and correspond to each other. The two groups of the rotating shaft 115 are respectively located on both sides of the horizontal center axis of the moving plate 112, and the two groups of the connecting plates 114 are symmetrically distributed on both sides of the horizontal center axis of the moving plate 112. In this embodiment, each group of the rotating shaft 115, the connecting plate 114, the latch 113, the locking plate 116, and the locking socket are matched and cooperated with each other to realize the rotation of the rotating shaft 115 by driving the moving plate 112 to move.

[0058] In this embodiment, the layouts of the two groups of rotating shafts 115 and the two groups of connecting plates 114 are symmetrical relative to the center of the movable plate 112, which helps to maintain the balance and stability of the mechanical structure while providing sufficient strength and reliability.

[0059] In this embodiment, four latches 113 and rotating shafts 115 are provided, which are respectively located at the four top corners of the lower mounting plate (as described below), which can ensure that the mechanical structure can evenly distribute the load when subjected to force and reduce local stress concentration.

[0060] It should be noted that the number of latches 113 and shafts 115 is usually selected based on the functional requirements, stability requirements, material properties, etc. of the mechanical structure. Four latches 113 and four shafts 115 may mean that the mechanical structure needs to provide stable connection and rotation support in multiple directions.

[0061] In this embodiment, the length of the locking plate 116 is greater than its width; or, the length of the locking plate 116 is less than its width. In this embodiment, the locking plate 116 has different dimensions in the horizontal direction (length) and the vertical direction (width) so that the locking plate 116 can be rotated to cooperate with the locking socket (described below) of the lower connecting mechanism 2 to achieve the locking or unlocking function.

[0062] In other embodiments, the locking plate 116 may be in any shape with unequal length-to-width ratios.

[0063] In this embodiment, the locking assembly 11 achieves rapid response of locking and unlocking through precise control of the driving member 111, which can effectively improve work efficiency.

[0064] In this embodiment, the lower connecting mechanism 2 includes a lower mounting plate 22, on which a locking socket 221 corresponding to the locking plate 116 is provided. The locking socket 221 is used to receive the locking force from the upper connecting mechanism 1, thereby achieving a stable connection with the upper connecting mechanism.

[0065] It should be noted that the shape, position and number of the locking holes 221 match the shape, size and installation requirements of the locking plate 116 .

[0066] In this embodiment, when the upper and lower connection mechanisms need to be connected, the lower connection machine 2 rises, the locking plate 116 is inserted into the locking socket 221 of the lower connection machine 2, and the driving member 111 is started to drive the movable plate 112 to move in a certain direction. The movable plate 112 drives the connecting plate 114 to slide in the limiting hole 1141 through the latch 113, and then drives the rotating shaft 115 to rotate. When the rotating shaft 115 rotates, the locking plate 116 at its end rotates accordingly to achieve locking. Conversely, when the connection needs to be disconnected, the driving member 111 drives the movable plate 112 to move in the reverse direction to achieve unlocking, and then drives the lower connection machine 2 to descend, so that the locking plate 116 is disengaged from the locking socket 221 of the lower connection mechanism 2, and the lower connection machine 2 is released.

[0067] In this embodiment, a plug assembly 21 is installed on the lower mounting plate 22, and the plug assembly 21 is used to electrically connect to a device that requires power. A socket 15 that plugs into and mates with the plug assembly 21 is installed on the upper mounting plate 13, and the socket 15 is electrically connected to a power source.

[0068] It should be noted that the plug assembly 21 and the socket 15 are plugged together to achieve electrical connection, which is a prior art. Those skilled in the art should be aware of its structure, principle, and usage, so a detailed description is not given here.

[0069] In this embodiment, the plug assembly 21 includes an electrical connection contact 211, a spring 212, and a shell 213. The spring 212 and the shell 213 are sequentially mounted on the outer periphery of the electrical contact from the inside to the outside. The shell 213 is fixedly connected to the lower mounting plate 22. The upper and lower ends of the spring 212 are respectively abutted against the shell 213 and the electrical contact. The electrical connection contact 211 includes an extending end, which is in electrical contact with the socket 15 and extends out of the shell 213. The shell 213 is mainly used to protect the electrical connection contact 211, making it less susceptible to damage, thereby effectively reducing maintenance costs.

[0070] In this embodiment, since the spring 212 has a certain elasticity, it can adapt to the slight tolerance differences that may exist between the plug assembly 21 and the socket 15. Even if the position or shape of the socket 15 changes slightly, the spring 212 can ensure the close contact between the electrical connection contact 211 and the socket 15. In addition, the buffering effect of the spring 212 can effectively reduce the direct impact and wear between the electrical connection contact 211 and the socket 15, which helps to extend the service life of the plug assembly 21 and the socket 15 and reduce damage caused by frequent plugging and unplugging.

[0071] In this embodiment, a guide plate 132 matching the lower mounting plate 22 is provided on the side of the upper mounting plate 13 facing the lower connecting mechanism 2, and the end of the guide plate 132 away from the upper mounting plate 13 is provided with an inverted funnel-shaped structure. The guide plate 132 plays a guiding role, which helps to guide the lower connecting mechanism 2 to rise along the correct path and cooperate with the upper connecting mechanism 1, thereby effectively improving the accuracy of the connection and reducing the risk of misoperation.

[0072] The present invention provides an automatic conversion connection device for an electric hoist. The device adopts a modular design, so that each component is easy to install, disassemble and maintain, thereby reducing maintenance costs, and can be customized and expanded according to actual needs. In addition, the integrated design makes the entire device compact and occupies a small space, suitable for various complex environments, while maintaining good stability and reliability and being able to withstand large loads. The device achieves multiple benefits such as reliability, flexibility, compactness, efficient energy transfer, and easy maintenance and replacement of the mechanical structure through precise coordination and efficient linkage between multiple components. At the same time, it also meets the needs for locking and unlocking functions in specific application scenarios.

[0073] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0074] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. An automatic switching connection device for electric spreaders, characterized in that: comprising an upper connecting mechanism and a lower connecting mechanism; The upper connecting mechanism includes a locking assembly, a fixed seat and an upper mounting plate, the fixed seat and the upper mounting plate are fixedly connected, the locking assembly is installed on the upper mounting plate, the locking assembly includes a driving member, a moving plate, a latch, a connecting plate, a rotating shaft, and a locking plate, the driving member is fixed on the fixed seat, the driving part of the driving member is linked to the moving plate to drive the moving plate to move, a limited hole is provided on the connecting plate, the latch is fixedly connected to the moving plate and the latch is inserted in the limited hole, the rotating shaft passes through the upper mounting plate, the connecting plate is fixedly connected to the rotating shaft, the moving plate is linked with the rotating shaft through the latch, the connecting plate and the rotating shaft, so that the movement of the moving plate can drive the rotating shaft, and the locking plate is fixedly connected to one end of the rotating shaft toward the lower connecting mechanism; The lower connecting mechanism comprises a lower mounting plate, on which a locking socket corresponding to the locking plate is arranged.

2. The automatic switching connection device for electric spreaders according to claim 1, characterized in that: The movable plate comprises a fixing part, an installation part and a connecting part, wherein the connecting part is located at the top end surface of the fixing part, the driving part of the driving member is connected with the link, the installation part is located at the side wall of the fixing part, and the latch is installed on the installation part.

3. The automatic switching connection device for electric spreaders according to claim 1, characterized in that: The upper mounting plate is provided with a slide rail, and the movable plate is slidably mounted on the upper mounting plate through the slide rail.

4. An automatic switching connection device for electric spreaders according to any one of claims 1 to 3, characterized in that: The upper connecting mechanism also includes a limiting member, which is located at the front end and / or the rear end of the movable plate to limit the movable range of the movable plate.

5. The automatic switching connection device for electric spreaders according to any one of claims 1 to 3, characterized in that: In the vertical direction, there is a gap between the fixing seat and the upper mounting plate, the locking assembly is installed between the fixing seat and the upper mounting plate, and the lower connecting mechanism is located below the upper mounting plate.

6. An automatic switching connection device for electric spreaders according to any one of claims 1 to 3, characterized in that: The rotating shaft, connecting plate, latch, locking plate and locking socket respectively include two groups and correspond to each other. The two groups of rotating shafts are respectively located on both sides of the horizontal center axis of the moving plate, and the two groups of connecting plates are symmetrically distributed on both sides of the horizontal center axis of the moving plate.

7. The automatic switching connection device for electric spreaders according to claim 6, characterized in that: The length of the locking plate is greater than its width; alternatively, the length of the locking plate is less than its width.

8. An automatic switching connection device for electric spreaders according to any one of claims 1 to 3, characterized in that: A plug assembly is installed on the lower mounting plate, and the plug assembly is used to be electrically connected to a device that needs power supply. A socket that plugs and cooperates with the plug assembly is installed on the upper mounting plate, and the socket is electrically connected to a power source.

9. The automatic switching connection device for electric spreaders according to claim 8, characterized in that: The plug assembly includes an electrical connection contact, a spring, and a shell. The spring and the shell are sequentially mounted on the outer circumference of the electrical contact from the inside to the outside. The shell is fixedly connected to the lower mounting plate. The upper and lower ends of the spring are respectively abutted against the shell and the electrical contact. The electrical connection contact includes an extending end, which is in electrical contact with the socket and extends out of the shell.

10. An automatic switching connection device for electric spreaders according to any one of claims 1 to 3, characterized in that: A guide plate matching the lower mounting plate is arranged on one side of the upper mounting plate facing the lower connecting mechanism, and an end of the guide plate away from the upper mounting plate is arranged as an inverted funnel-shaped structure.

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