Container spreader

Abstract

The present application relates to a kind of container spreader, including hanger and spinlock mechanism, spinlock mechanism includes the spinlock shaft fixedly arranged in the side of hanger, spinlock body is rotatably assembled on spinlock shaft and the locating fitting structure for locking spinlock body, spinlock body includes rotating main body, rotating main body is sleeved on spinlock shaft and is rotatably matched with spinlock shaft, multiple hooks are arranged on the outer cylinder wall of the same rotating main body and the hook is axially and circumferentially staggered arrangement, hook rotates around spinlock shaft with rotating main body and has lifting position and disengagement position, the hook for being in lifting position is used to be hooked with container, when the hook on rotating main body is in lifting position, other hooks are in disengagement position.The container spreader of the present application is provided with spinlock mechanism with multiple hooks on the side of hanger, different hooks are switched by rotating spinlock mechanism, to adaptively hoist different transverse size containers, simple structure, easy to operate, and ensure hoisting strength.

Description

Technical Field

[0001] This invention relates to the field of logistics and transportation technology, and specifically to a container lifting device. Background Technology

[0002] Lifting tools refer to devices used in lifting machinery to lift heavy objects. They are widely used in the lifting and hoisting industry. Commonly used lifting tools include chain slings such as hooks and shackles, as well as specialized lifting tools with specific lifting interfaces such as suction cups and grippers. In the lifting of naval ammunition containers, to ensure convenient and stable lifting, these containers are generally equipped with four standard corner brackets at the four top corners (see reference). Figure 3 As shown in the figure, the standard corner bracket is provided with lifting holes for connecting and cooperating with the spreader. The special spreader of the container is hooked and cooperated with the standard corner bracket to achieve lifting.

[0003] In practical lifting applications, containers come in various models and sizes. Lifting different models of containers requires corresponding changes to the container spreader. However, container spreaders are large and changing them is complex, leading to low lifting efficiency. To improve efficiency, existing technologies have modified the container spreader's frame into a telescopic structure capable of horizontally extending and adjusting its width to adapt to container dimensions. For example, a container spreader disclosed in Chinese utility model patent application CN216426460U mainly includes a horizontally telescopic adjustable spreader beam, a drive device, and locks (i.e., hooks). When lifting different models of containers, the drive device adjusts the length of the spreader beam accordingly, so that the spacing between the locks corresponds to the lifting holes on the container's corner fittings, achieving adaptable lifting for different container models.

[0004] However, since the spreader beam of this type of container spreader is driven to extend and retract by a drive device, the drive device needs to be installed on the spreader beam, making the structure relatively complex. Furthermore, the specific extension and retraction length of the spreader beam needs to be precisely adjusted to match the container model, which is inconvenient to operate. At the same time, since the spreader beam is a telescopic structure, its structural strength is difficult to guarantee, resulting in poor reliability. Summary of the Invention

[0005] To address the aforementioned problems, the present invention provides a container spreader that solves the issues of inconvenience in using existing adaptable and adjustable container spreaders and low lifting strength.

[0006] To achieve the above objectives, the container spreader of this invention adopts the following technical solution: It includes a spreader and hooks, the hooks being used to engage with lifting holes on the container; it also includes a twist-locking mechanism, with at least four twist-locking mechanisms all located on the side of the spreader. The twist-locking mechanisms are positioned corresponding to the lifting holes on the container. The hooks are mounted on the twist-locking mechanisms. Each twist-locking mechanism includes a twist-locking shaft, a twist-locking body, and a positioning and engaging structure. The twist-locking shaft is fixedly located on the side of the spreader and extends horizontally away from the spreader, so that the axial direction of the twist-locking shaft corresponds to the lateral direction of the container. The twist-locking body includes a rotating body, which is a horizontally extending cylindrical body. The rotating body is fitted onto the twist-locking shaft and rotatably engages with the twist-locking shaft. Each twist-locking mechanism... Each rotating body is equipped with multiple hooks, which are mounted on the outer wall of the rotating body. The hooks on the same rotating body are staggered in both the axial and circumferential directions to form different lateral lifting dimensions, thus adapting to the lifting of containers with different lateral dimensions. The hooks rotate around the pivot shaft with the rotating body. During rotation, the hooks have a lifting position and a disengagement position. The hooks in the lifting position are used to engage with the corresponding lifting holes on the container, and the hooks in the disengagement position are disengaged from the lifting holes on the container. When one hook on the rotating body is in the lifting position, the other hooks on the same rotating body are in the disengagement position. The positioning and engagement structure is used to lock the position of the hook relative to the pivot shaft when the hook rotates to the lifting position.

[0007] Its beneficial effects are as follows: The container spreader of the present invention has a rotatable locking mechanism consisting of a rotatable locking body and a rotatable locking shaft on the side of the spreader frame. Multiple hooks are set on the rotatable locking body of the same rotatable locking mechanism in an axial and circumferentially staggered manner, so that the hooks follow the rotation of the rotatable locking body around the rotatable locking shaft and have freely switchable lifting positions and disengagement positions. Moreover, the axial direction of the rotatable locking shaft corresponds to the lateral direction of the container. Thus, different hooks have different lateral lifting dimensions when switched to the lifting position, so as to adapt to the lifting of containers with different lateral dimensions. The operation is simple and easy to adjust. At the same time, there is no need to set an additional drive or telescopic structure on the spreader frame, which simplifies the spreader structure and ensures the lifting strength of the spreader.

[0008] Preferably, the positioning and fitting structure includes a positioning groove, a positioning hole, and a positioning pin. The positioning groove is provided on the outer peripheral surface of the rotary lock shaft. Multiple positioning grooves are provided on the outer peripheral surface of the rotary lock shaft at the same axial position. The positioning hole is provided through the cylindrical wall of the rotating body. The positioning pin passes through the positioning hole and is inserted into the positioning groove to lock the position of the rotating body relative to the rotary lock shaft.

[0009] Preferably, a locking protrusion is provided on the outer wall of the rotating body corresponding to the position of the positioning hole. The locking protrusion is located outside the positioning hole, and the positioning hole passes through the locking protrusion in the radial direction of the rotating body. A self-locking groove is provided on the outer circumferential surface of the positioning pin. A spring ball is provided in the locking protrusion perpendicular to the axial direction of the positioning pin. The ball at the end of the spring ball is pressed into the self-locking groove to realize the self-locking of the position of the positioning pin in the positioning hole.

[0010] Its beneficial effects are as follows: the self-locking of the positioning pin is achieved by the spring ball and the self-locking groove on the outer circumference of the positioning pin, which can effectively prevent the positioning pin from falling off, ensure the reliability of hoisting, and facilitate operation.

[0011] Preferably, two self-locking grooves are provided at intervals along the axial direction of the positioning pin. The self-locking groove includes a sliding self-locking groove and a positioning self-locking groove. The distance between the sliding self-locking groove and the positioning groove is smaller than the distance between the positioning self-locking groove and the positioning groove. When the positioning pin is inserted into the positioning groove, the spring ball is pressed against the positioning self-locking groove. When the positioning pin is pulled out of the positioning groove, the spring ball is pressed against the sliding self-locking groove.

[0012] Its beneficial effects are as follows: two self-locking grooves are axially spaced on the outer circumferential surface of the locating pin, which ensures that the locating pin can be fixed on the rotary locking mechanism after it is disengaged from the locating groove, making it easy to operate and effectively preventing the locating pin from being lost.

[0013] Preferably, the positioning and fitting structure further includes a groove formed on the outer peripheral surface of the rotary lock shaft. The depth of the groove is less than the depth of the positioning groove. The groove is used to guide the positioning pin to guide its movement path. When the spring ball is pressed against the sliding self-locking groove on the positioning pin, the positioning pin can be guided to move within the groove. The groove includes multiple axial groove sections and one circumferential groove section. The axial groove sections are connected to the positioning groove and extend along the axial direction of the rotary lock shaft. The circumferential groove section extends along the circumferential direction of the rotary lock shaft. The circumferential groove section connects the ends of each axial groove section away from the positioning groove, thereby connecting each positioning groove through the groove.

[0014] Its beneficial effects are as follows: by using the guide cooperation of the slide groove and the positioning pin, the rotation state switching between the swivel lock body and the swivel lock shaft of the swivel lock mechanism is guided, which facilitates the rapid switching of the hook on the swivel lock body between the lifting position and the detachment position, and helps to improve the lifting efficiency.

[0015] Preferably, the outer peripheral surface of the locating pin and the wall of the locating hole are provided with mating threads, and the locating pin and the locating hole threads are mated to achieve the self-locking of the locating pin position.

[0016] Preferably, the rotary lock shaft is further provided with a lubricating oil passage, which includes a main oil passage and a branch oil passage. The main oil passage extends axially from the end of the rotary lock shaft away from the hanger toward the hanger, and the branch oil passage extends from the main oil passage to the outer peripheral surface of the rotary lock shaft, connecting the main oil passage with the outer peripheral surface of the rotary lock shaft.

[0017] Its beneficial effects are as follows: by using the lubrication channel to inject oil between the swivel lock shaft and the swivel lock body, it is beneficial to ensure that the swivel lock body slides and rotates smoothly on the swivel lock shaft, ensures rapid hook switching, and improves lifting efficiency.

[0018] Preferably, an oil cup is inserted into the main oil passage, and the oil cup is used to deliver lubricating oil into the main oil passage.

[0019] Preferably, the hook includes a first hook and a second hook, which are fixedly disposed on opposite sides of the outer cylinder wall of the rotating body. The first hook is disposed at the end of the rotating body closer to the jack to accommodate containers with a first lateral dimension, and the second hook is disposed at the end of the rotating body away from the jack to accommodate containers with a second lateral dimension, wherein the first lateral dimension is smaller than the second lateral dimension.

[0020] Preferably, the rotary lock shaft further includes a screw portion for threaded connection with the hanger to fix the rotary lock shaft to the hanger. The horizontal position of the hook can be finely adjusted by turning the rotary lock shaft.

[0021] Its beneficial effects are as follows: the screw lock shaft is threaded on the lifting frame, and the horizontal position of the screw lock mechanism can be finely adjusted by turning the screw lock shaft, thereby adjusting the horizontal position of the hook, so that the hook can be more properly hooked and matched with the container, ensuring the reliability of the lifting. Attached Figure Description

[0022] Figure 1 This is a structural diagram of a container in the prior art;

[0023] Figure 2 This is a front view of the container spreader according to Embodiment 1 of the present invention;

[0024] Figure 3 for Figure 2 A side view of the container spreader in the middle;

[0025] Figure 4 This is a schematic diagram of the rotary lock mechanism;

[0026] Figure 5 This is a schematic diagram of the twistlock shaft.

[0027] Figure 6 This is a cross-sectional view of the rotary lock shaft;

[0028] Figure 7 This is a schematic diagram illustrating the usage process of the container spreader of the present invention.

[0029] In the diagram: 1. Container; 2. Corner fitting; 3. Lifting hole; 4. Guide pulley block; 5. Lifting frame; 6. Twisting lock mechanism; 7. Twisting lock shaft; 71. Positioning groove; 72. Slide groove; 721. First slide groove section; 722. Second slide groove section; 723. Third slide groove section; 73. Main oil passage; 74. Branch oil passage; 75. Oil cup; 8. Twisting lock body; 81. Rotating main body; 82. First hook; 83. Second hook; 84. Positioning hole; 85. Locking protrusion; 9. Positioning pin; 91. Sliding self-locking groove; 92. Positioning self-locking groove; 10. Spring ball. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely one embodiment of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] The features and performance of the present invention will be further described in detail below with reference to examples.

[0034] A specific embodiment of the container spreader of the present invention is as follows: Figure 2 and Figure 3As shown, the container spreader mainly includes a guide pulley block 4, a lifting frame 5, and a twist-locking mechanism 6. The guide pulley block 4 is fixedly installed above the lifting frame 5 and is connected to the crane lifting mechanism via wire rope to move the entire container spreader. The twist-locking mechanism 6 is equipped with hooks for hooking and engaging with the corresponding container 1.

[0035] The specific structure of container 1 is referenced. Figure 1 As shown, a corner piece 2 is fixedly installed at the top corner of container 1. The corner piece 2 is composed of three mutually perpendicular plates to correspond and fit with the top corner of container 1. Each of the three plates that make up the corner piece 2 is provided with a lifting hole 3. The lifting hole 3 is used to hook and cooperate with the hook of the container spreader to realize the lifting of container 1.

[0036] There are four twist-locking mechanisms 6, all of which are located on the side of the lifting bracket 5 and correspond to the positions of the lifting holes 3 on the four corner fittings 2 of the top of the container 1. Combined with... Figure 4 As shown, the rotary locking mechanism 6 mainly includes a rotary locking shaft 7, a rotary locking body 8, a positioning pin 9, and a spring ball 10. The rotary locking shaft 7 is provided with a screw part, which is threadedly fixed to the side of the hanger 5 to fix the rotary locking shaft 7 on the side of the hanger 5. The rotary locking shaft 7 extends horizontally away from the hanger 5 so that the axial direction of the rotary locking shaft 7 corresponds to the lateral direction of the container 1. The rotary locking body 8 is rotatably assembled on the rotary locking shaft 7 and has a hook. The positioning pin 9 is used to lock the relative position of the rotary locking shaft 7 and the rotary locking body 8 in the rotation direction to adjust the position of the hook. The spring ball 10 is used to fix the positioning pin 9.

[0037] Reference Figure 5 and Figure 6 As shown, the rotary lock shaft 7 is provided with a sliding groove 72, a positioning groove 71, and a lubrication oil passage. The lubrication oil passage is located inside the rotary lock shaft 7, while the sliding groove 72 and the positioning groove 71 are located on the outer circumferential surface of the rotary lock shaft 7. The positioning groove 71 is used for the insertion of the positioning pin 9 to lock the position of the rotary lock body 8 relative to the rotary lock shaft 7. The depth of the positioning groove 71 is greater than the depth of the sliding groove 72. The sliding groove 72 comprises three continuous parts: a first sliding groove section 721 and a third sliding groove section 723 respectively disposed opposite to each other on the circumferential surface of the rotary lock shaft 7, and a second sliding groove section 722 connecting the first sliding groove section 721 and the third sliding groove section 723.

[0038] The first slide section 721 and the second slide section 722 extend axially along the pivot shaft 77. The second slide section 722 extends circumferentially along the pivot shaft 77. Both ends of the second slide section 722 are connected to the ends of the first slide section 721 and the third slide section 723 away from the hanger 5, respectively. There are two positioning grooves 71, which are respectively located at the ends of the first slide section 721 and the third slide section 723 near the hanger 5. The slide 72 is used to guide and cooperate with the positioning pin 9 to avoid and guide the movement path of the positioning pin 9, thereby guiding the movement of the pivot body 8 relative to the pivot shaft 7.

[0039] The lubrication channel includes a main oil channel 73 and a branch oil channel 74. The main oil channel 73 extends from the end of the rotary lock shaft 7 away from the hanger 5 toward the hanger 5. An oil cup 75 is inserted into the main oil channel 73 for injecting lubricating oil into the main oil channel 73. The branch oil channel 74 extends from the main oil channel 73 to the outer peripheral surface of the rotary lock shaft 7 to connect the main oil channel 73 and the outer peripheral surface of the rotary lock shaft 7, thereby delivering lubricating oil to the outer peripheral surface of the rotary lock shaft 7 and ensuring smooth sliding between the rotary lock body 8 and the rotary lock shaft 7.

[0040] like Figure 4 As shown, the rotary lock body 8 includes a rotating body 81, and hooks are disposed on the outer side wall of the rotating body 81. The hooks specifically include a first hook 82 and a second hook 83. The rotating body 81 is a horizontally extending cylinder. The rotating body 81 is fitted onto the rotary lock shaft 7 and rotates in cooperation with the rotary lock shaft 7. The first hook 82 and the second hook 83 are fixedly disposed on opposite sides of the outer cylinder wall of the rotating body 81. The first hook 82 and the second hook 83 are offset in the axial direction of the rotating body 81. The first hook 82 is disposed at the end of the rotating body 81 near the lifting frame 5 to accommodate the container 1 with a first lateral dimension. The second hook 83 is disposed at the end of the rotating body 81 away from the lifting frame 5 to accommodate the container 1 with a second lateral dimension. The first lateral dimension is smaller than the second lateral dimension. The hook rotates around the pivot shaft 7 with the pivot lock body 8 and has a set position: a lifting position and a disengaged position. The hook in the lifting position is used to hook and cooperate with the corresponding lifting hole 3 on the top of the container 1. The hook in the disengaged position is disengaged from the lifting hole 3 of the container 1 and can be used as a handle to adjust the pivot lock mechanism 6. When the first hook 82 is in the lifting position, the second hook 83 is in the disengaged position, and when the first hook 82 is in the disengaged position, the second hook 83 is in the lifting position.

[0041] The outer wall of the rotating body 81 is provided with a locking protrusion 85. A positioning hole 84 is provided through the locking protrusion 85 along the radial direction of the rotating body 81. The positioning pin 9 passes through the positioning hole 84 and is inserted into the positioning groove 71 on the rotary lock shaft 7 to fix the position of the rotary lock body 8 relative to the rotary lock shaft 7 after it is adjusted to the hoisting position. Self-locking grooves are provided at intervals along the axial direction on the outer circumference of the positioning pin 9. A spring ball 10 is provided in the locking protrusion 85 perpendicular to the axial direction of the positioning pin 9. The ball at the end of the spring ball 10 presses against the self-locking groove of the positioning pin 9 to achieve self-locking of the positioning pin 9 in the positioning hole 84. The self-locking groove includes a sliding self-locking groove 91 and a positioning self-locking groove 92. When the positioning pin 9 is inserted into the positioning groove 71, the spring ball 10 is pressed against the positioning self-locking groove 92. When the positioning pin 9 is pulled out into the sliding groove 72, the spring ball 10 is pressed against the sliding self-locking groove 91.

[0042] The following section uses a single twist-lock mechanism 6 as an example to describe in detail the usage process of the container spreader of the present invention. Figure 7 As shown, the container spreader of the present invention includes the following state changes during use: (1) First lifting state: At this time, the container 1 being lifted by the container spreader has a small lateral dimension. The first hook 82 is located below the swivel lock shaft 7 and is in the lifting position. The second hook 83 is located above the swivel lock shaft 7 and is in the disengaged position. The first hook 82 is hooked and engaged with the lifting hole 3 on the top of the container 1. The positioning pin 9 passes through the positioning hole 84 and is inserted into the positioning groove 71 on the swivel lock shaft 7. The spring ball 10 presses against the positioning self-locking groove 92 of the positioning pin 9 to fix the position of the positioning pin 9, thereby locking the swivel lock body 8 and the swivel lock shaft 7, that is, locking the lifting position of the first hook 82; (2) Unlocking state: Pull the positioning pin 9 outward to make the spring ball 10 automatically retract and roll into the sliding self-locking groove 91 of the positioning pin 9. The end face of the positioning pin 9 is basically flush with the bottom surface of the sliding groove 72, thus releasing the first hook 82. (3) Twist lock sliding state: Pull the twist lock body 8 outward in the direction away from the jack 5, and the positioning pin 9 is guided to slide in the corresponding slide groove 72 section on the twist lock shaft 7 to the second slide groove section 722; (4) Twist lock adjustment state: Rotate the twist lock body 8, and the positioning pin 9 is guided to slide in the second slide groove section 722 to another slide groove section 72. At this time, the first hook 82 flips to the top of the twist lock shaft 7 and switches to the disengaged position, and the second hook 83 flips to the bottom of the twist lock shaft 7 and switches to the lifting position; (5) Second lifting state: Push the twist lock body 8 in the direction close to the jack 5, and the positioning pin 9 is guided to slide in the slide groove 72 to another positioning groove 71. Insert the positioning pin 9 inward, and the spring ball 10 automatically retracts and rolls into the positioning self-locking groove 92 of the positioning pin 9 to achieve the self-locking of the positioning pin 9, so as to lock the lifting position of the second hook 83, and then realize the lifting of another container 1 with a larger lateral dimension.

[0043] The container spreader described above in this invention can be adjusted according to the model and size of the container 1 to be lifted during use. By correspondingly converting different hooks, it is possible to lift different models of containers 1 without requiring special settings for the spreader 5. This is convenient to use and ensures the strength of the lifting structure.

[0044] Of course, the container spreader of the present invention is not limited to the embodiments described above. This article also provides several other embodiments of container spreaders based on the design concept of the present invention, as follows:

[0045] In other embodiments, unlike the embodiments described above, the outer circumferential surface of the rotary lock shaft may not have a sliding groove, but only a positioning groove. Correspondingly, the rotary lock body may not have a locking protrusion and a spring ball, and the positioning pin can be directly pulled out of the positioning hole.

[0046] In other embodiments, unlike the embodiments described above, the self-locking structure of the locating pin may not be a spring ball, or mating threads may be provided on the outer peripheral surface of the locating pin and the wall of the locating hole.

[0047] In other embodiments, unlike the embodiments described above, the hooks on the twistlock body can be provided in more than two ways. Each hook is staggered in the axial direction of the twistlock body, ensuring that they do not interfere with each other. Correspondingly, the positioning grooves on the twistlock shaft are also provided in more than two ways, and the axial sliding grooves are also provided in more than two sections to connect the positioning grooves.

[0048] In other embodiments, unlike the embodiments described above, the positioning and fitting structure between the rotary lock body and the rotary lock shaft may not be a positioning pin and a positioning groove, but may also be a positioning protrusion on the rotary lock body. The rotary lock body is fixedly connected to the hanger through the positioning protrusion to achieve the fixation of the relative position between the rotary lock body and the rotary lock shaft.

[0049] In other embodiments, unlike the embodiments described above, the twistlock mechanism may not be limited to four; it may be configured to correspond to the number and position of the lifting holes on the container, meaning that there may be more than four twistlock mechanisms.

[0050] In other embodiments, unlike the embodiments described above, the screw portion may not be provided on the swivel lock shaft, or the swivel lock shaft may be directly fixed to the hanger by welding or fasteners.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A container spreader comprising a spreader bar and a spreader hook for hooking engagement with a lifting hole on a container, characterised in that: The rotating locking mechanism is arranged on the side of the hanger and corresponds to the lifting holes on the four corners of the top of the container. The hook is arranged on the rotating locking mechanism. The rotating locking mechanism comprises a rotating shaft, a rotating body and a positioning structure. The rotating shaft is fixedly arranged on the side of the hanger and extends horizontally away from the hanger, so that the axial direction of the rotating shaft corresponds to the transverse direction of the container. The rotating body comprises a rotating main body which is a horizontally extending cylinder. The rotating main body is sleeved on the rotating shaft and is rotationally connected with the rotating shaft. A plurality of hooks are arranged on the rotating main body. The hooks are arranged on the outer cylinder wall of the rotating main body. The hooks on the same rotating main body are arranged in a staggered manner in the axial direction and the circumferential direction of the rotating main body, so as to form different transverse lifting sizes and adapt to the lifting of containers with different transverse sizes. The hook rotates around the rotating shaft with the rotating main body. The hook has a lifting position and a disengagement position in the rotating process. The hook in the lifting position is used for hooking and cooperating with the lifting hole on the container. The hook in the disengagement position is disengaged from the lifting hole on the container. When one hook on the rotating main body is in the lifting position, the other hooks on the same rotating main body are in the disengagement position. The positioning structure is used for locking the position of the hook relative to the rotating shaft when the hook rotates to the lifting position. The positioning structure comprises a positioning groove, a positioning hole and a positioning pin. The positioning groove is arranged on the outer circumferential surface of the rotating shaft. A plurality of positioning grooves are arranged on the outer circumferential surface at the same axial position of the rotating shaft. The positioning hole is arranged through the cylinder wall of the rotating main body. The positioning pin is inserted into the positioning groove through the positioning hole, so as to lock the position of the rotating main body relative to the rotating shaft.

2. The container spreader as claimed in claim 1, characterized in that A locking protrusion is arranged on the outer cylinder wall of the rotating main body and corresponds to the position of the positioning hole. The locking protrusion is arranged on the outer side of the positioning hole. The positioning hole penetrates the locking protrusion in the radial direction of the rotating main body. A self-locking groove is arranged on the outer circumferential surface of the positioning pin. A spring ball is arranged in the locking protrusion and is perpendicular to the axial direction of the positioning pin. The ball end of the spring ball is pressed into the self-locking groove, so as to self-lock the position of the positioning pin in the positioning hole.

3. The container spreader as claimed in claim 2, characterized in that Two self-locking grooves are arranged in the axial direction of the positioning pin. The self-locking grooves comprise a sliding self-locking groove and a positioning self-locking groove. The distance between the sliding self-locking groove and the positioning groove is smaller than the distance between the positioning self-locking groove and the positioning groove. When the positioning pin is inserted into the positioning groove, the spring ball is pressed and cooperates with the positioning self-locking groove. When the positioning pin is pulled out of the positioning groove, the spring ball is pressed and cooperates with the sliding self-locking groove.

4. The container spreader as claimed in claim 3, characterized in that The positioning fitting structure further comprises a sliding groove formed on the outer circumferential surface of the spin-locked shaft, the depth of the sliding groove is less than the depth of the positioning groove, the sliding groove is used for guiding the positioning pin to move along a path, when the spring ball is in pressure contact with the sliding self-locking groove on the positioning pin, the positioning pin can move along the sliding groove, the sliding groove comprises a plurality of axial sliding groove segments and a circumferential sliding groove segment, the axial sliding groove segments are in communication with the positioning grooves and extend along the axial direction of the spin-locked shaft, the circumferential sliding groove segment extends along the circumferential direction of the spin-locked shaft, and the circumferential sliding groove segment is in communication with one end of each axial sliding groove segment away from the positioning groove, so that each positioning groove is in communication through the sliding groove.

5. The container spreader as claimed in claim 1, characterized in that, The outer circumferential surface of the positioning pin is provided with a matching thread on the hole wall of the positioning hole, and the positioning pin is in threaded connection with the positioning hole to realize self-locking of the position of the positioning pin.

6. The container spreader as claimed in claim 1, characterized in that The spin-locked shaft is further provided with a lubricating oil channel, the lubricating oil channel comprises a main oil channel and a branch oil channel, the main oil channel extends axially from one end of the spin-locked shaft away from the hanger towards the hanger, and the branch oil channel extends from the main oil channel to the outer circumferential surface of the spin-locked shaft, so that the main oil channel is in communication with the outer circumferential surface of the spin-locked shaft.

7. The container spreader as claimed in claim 6, characterized in that An oil cup is inserted into the main oil channel, and the oil cup is used for delivering lubricating oil into the main oil channel.

8. The container spreader as claimed in claim 1, characterized in that The hanger comprises a first hanger and a second hanger, the first hanger and the second hanger are fixedly arranged on the outer cylinder wall of the rotating main body on opposite sides, the first hanger is arranged at one end of the rotating main body close to the hanger to adapt to a first transverse dimension container, the second hanger is arranged at one end of the rotating main body away from the hanger to adapt to a second transverse dimension container, and the first transverse dimension is less than the second transverse dimension.

9. A container spreader according to any of claims 1-8, characterized in that, The spin-locked shaft further comprises a screw portion, the screw portion is used for threaded connection with the hanger to fixedly connect the spin-locked shaft to the hanger, and the horizontal position of the hanger can be finely adjusted by rotating the spin-locked shaft.

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