Automatic unloading device for unattended ship unloader

Abstract

The application discloses an automatic unloading device for an unattended ship unloader, which comprises a workbench, a height adjusting mechanism, a steering adjusting mechanism and a loading mechanism. The height adjusting mechanism is connected to the bottom of the workbench, the steering adjusting mechanism is connected to the bottom of the height adjusting mechanism, and the loading mechanism is located on the top of the workbench. The loading mechanism comprises a guide plate, a collecting box and an unloading box. The unloading box is slidably connected to the guide plate through a first guide structure. The collecting box is located at the two ends of a second guide structure, and the two collecting boxes move relative to the second guide structure. The automatic unloading device for the unattended ship unloader has the advantages of efficient and stable unloading, flexible unloading height and unloading direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine equipment, and particularly relates to an automatic unloading device for an unattended ship unloader. BACKGROUND

[0002] The ship unloader is a special machine which uses continuous conveying machinery to make a machine head capable of lifting bulk materials, or has self-retrieving capacity, or is equipped with a material taking and feeding device, and continuously puts bulk materials out of the ship cabin, and then unloads the bulk materials to the boom or frame and can be transported to the main conveying system on the shore, so as to greatly improve the unloading efficiency, maintain the environment clean with minimum dust pollution, and be high in efficiency and environmental protection. However, the related technology still has the following problems in the actual application process: the unloading work efficiency is low and is not fast and stable, because the structure used in the unloading in the above patent file is simple, so that the unloading work efficiency is low and is not fast and stable. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, an embodiment of the present application provides an automatic unloading device for an unattended ship unloader, which has the advantages of efficient and stable unloading, flexible unloading height and unloading direction.

[0004] The automatic unloading device for an unattended ship unloader according to the embodiment of the present application comprises a workbench, a height adjusting mechanism, a steering adjusting mechanism and a loading mechanism, the height adjusting mechanism is connected to the bottom of the workbench, the steering adjusting mechanism is connected to the bottom of the height adjusting mechanism, the loading mechanism is located at the top of the workbench, the loading mechanism comprises a guide plate, a collecting box and an unloading box, the unloading box is slidably connected to the guide plate through a first guide structure, the collecting box is located at both ends of a second guide structure, and the two collecting boxes move relative to the second guide structure.

[0005] The automatic unloading device for an unattended ship unloader according to the embodiment of the present application has the advantages of efficient and stable unloading, flexible unloading height and unloading direction.

[0006] In some embodiments, a guide groove and a first sliding groove are arranged on the guide plate, the first guide structure comprises a guide column, a sliding groove rod, a driving member and a guide rod, a first end of the guide column is connected to a connecting block, a second end of the guide column is provided with a sliding sleeve, the second end of the guide column passes through the guide groove and the sliding groove rod and is slidably connected to the guide rod through the sliding sleeve, a distal end of the guide rod away from the sliding groove slides along the first sliding groove, the driving member is connected to the guide plate and is rotationally connected to the sliding groove rod through an output end, a bottom of the connecting block is connected to a rectangular plate, and the rectangular plate is connected to the second guide structure.

[0007] In some embodiments, the guide groove is a U-shaped groove, the U-shaped groove comprises a horizontal segment and two vertical segments, the first sliding groove is located below the vertical segment and parallel to the horizontal segment.

[0008] In some embodiments, the guide rod is an L-shaped rod, the short rod of the L-shaped rod enters the first sliding groove, and the long rod of the L-shaped rod is sleeved with the sliding sleeve and is slidably connected with the sliding sleeve.

[0009] In some embodiments, the second guide structure comprises a sliding rod, a second driving member, a first connecting rod and a second connecting rod, two ends of the sliding rod are respectively slidably connected with the collection box, the second driving member is connected with the end of the connecting block, the output end of the second driving member is connected with the middle part of the second connecting rod, two ends of the second connecting rod are respectively pivotally connected with the first end of the first connecting rod, and the second end of the first connecting rod is pivotally connected with the collection box.

[0010] In some embodiments, the two collection boxes are oppositely arranged, and the end of the connecting block extends along a direction perpendicular to the axial direction of the sliding rod.

[0011] In some embodiments, the height adjusting mechanism comprises an adjusting plate, a third driving member, a third connecting rod, a fourth connecting rod and a sliding groove, the sliding groove is located at the bottom of the workbench and the top of the adjusting plate, the first end of the fourth connecting rod is slidably connected with the workbench through the sliding groove, the second end of the fourth connecting rod is pivotally connected with the adjusting plate, the first end of the third connecting rod is pivotally connected with the bottom of the workbench, the second end of the third connecting rod is slidably connected with the adjusting plate through the sliding groove, the second end of the third connecting rod corresponds to the first end of the fourth connecting rod, the output end of the third driving member is connected with a sliding block, and the sliding block is connected with the second end of the third connecting rod.

[0012] In some embodiments, the sliding groove has a through groove, a pin shaft passes through the sliding block and the through grooves of the two sliding grooves in the same plane, and two ends of the pin shaft are respectively connected with the second end of the third connecting rod or the first end of the fourth connecting rod.

[0013] In some embodiments, the extension direction of the through groove is the same as the moving direction of the third driving member, and the middle part of the third connecting rod is pivotally connected with the middle part of the fourth connecting rod.

[0014] In some embodiments, the steering adjusting mechanism comprises a base plate, a rotating shaft, a first gear, a second gear and a fourth driving member, a first end of the rotating shaft is connected with the adjusting plate, a second end of the rotating shaft is pivotally connected with the base plate, the first gear is sleeved on the rotating shaft, the fourth driving member is located on the base plate, the second gear is sleeved on an output end of the fourth driving member, and the first gear and the second gear are engaged.

[0015] Compared with the prior art, the application has the following advantages:

[0016] 1. In the application, the motor drives the sliding groove rod to rotate, the sliding groove rod drives the guide column to slide from the horizontal section to the vertical section in the inner side of the guide groove and then starts to descend, so that the collecting box descends, the material to be unloaded is between the two collecting boxes, the motor drives the second connecting rod to rotate, under the action of the first connecting rod, the left and right collecting boxes simultaneously slide on the sliding rod and approach each other, the material is clamped in the collecting box, then the motor reversely rotates, the collecting box moves upward to the top end first, then moves to the front end, and then continues to descend, so that the collecting box is at the specified location, then the motor is started again to drive the second connecting rod to rotate, the second connecting rod drives the left and right collecting boxes to simultaneously slide and move away from each other through the first connecting rod, so that the material is unloaded, thereby achieving a high-efficiency and stable automatic unloading effect, and improving the unloading work efficiency, which is more practical.

[0017] 2. In the application, the electric push rod drives the sliding block to move, the sliding column moves to drive the first connecting rod and the second connecting rod to rotate, so that the included angle between the two changes, the workbench is lifted and lowered, the height of the workbench is flexibly adjusted, the unloading height is flexibly controlled, different use requirements can be adapted, which is more convenient and practical.

[0018] 3. In the application, the motor drives the second gear to rotate, the first gear and the rotating shaft rotate, the adjusting plate rotates, the orientation of the collecting box is adjusted, the orientation of the entire device during unloading is flexibly adjusted, different unloading requirements can be adapted, which is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of the automatic unloading device for the unattended ship unloader according to the embodiment of the application.

[0020] Figure 2 It is Figure 1 the enlarged structure schematic view of the A area in the application.

[0021] Figure 3 It is a partial structure schematic view of the automatic unloading device for the unattended ship unloader according to the embodiment of the application.

[0022] Figure 4 It is the applicationFigure 3 A magnified structural diagram of region B in the middle.

[0023] Figure 5 For the present invention Figure 3 A magnified structural diagram of region C in the middle.

[0024] Figure 6 This is a partial schematic diagram of the second gear of the automatic unloading device for an unattended ship unloader in an embodiment of the present invention.

[0025] Reference numerals: 1. Base plate; 2. Adjusting plate; 3. Sliding column; 4. Sliding block; 5. Sliding groove block; 6. First connecting rod; 7. Second connecting rod; 8. Guide plate; 9. Sliding groove rod; 10. Guide rod; 11. Sliding sleeve; 12. Guide column; 13. Connecting block; 14. Rectangular plate; 15. Fixing block; 16. Sliding rod; 17. Collection box; 18. First connecting rod; 19. Second connecting rod; 20. First driving component; 21. Second driving component; 22. Unloading box; 24. Third driving component; 25. Rotating shaft; 26. First gear; 27. Fourth driving component; 28. Second gear; 29. ​​Guide groove; 30. Worktable; 31. First sliding groove. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] An automatic unloading device for an unattended ship unloader according to an embodiment of the present invention, such as... Figures 1 to 6 As shown, the automatic unloading device for the unmanned ship unloader includes a worktable, a height adjustment mechanism, a steering adjustment mechanism, and a loading mechanism. The height adjustment mechanism is connected to the bottom of the worktable, and the steering adjustment mechanism is connected to the bottom of the height adjustment mechanism. The loading mechanism is located at the top of the worktable and includes a guide plate, a collection box, and an unloading box. The unloading box is slidably connected to the guide plate through a first guide structure, and the collection box is located at both ends of a second guide structure. The two collection boxes move relative to each other with the second guide structure. A material unloading box is placed on the workbench, and a loading and unloading mechanism on the workbench is used to load and unload materials. A height adjustment mechanism connected to the workbench can change the height of the workbench. A steering adjustment mechanism connected to the height adjustment mechanism can drive the workbench to change the orientation of the loading and unloading mechanism. A first guide structure can raise and lower the height of the collection box, and a second guide structure can move the two collection boxes relative to each other or away from each other. The collection box descends with the first guide structure, so that the material to be unloaded is between the two collection boxes. The second guide structure drives the two collection boxes to move relative to each other, clamping the material inside the collection box. The first guide structure drives the collection box to rise, and the second guide structure drives the collection boxes to move away from each other, realizing automatic unloading.

[0028] The automatic unloading device for the unattended ship unloader has the advantages of efficient and stable unloading, flexible unloading height and unloading direction.

[0029] In some embodiments, the guide plate is provided with a guide groove and a first sliding groove, the first guide structure includes a guide column, a sliding groove rod, a driving member and a guide rod, the first end of the guide column is connected with the connecting block, the second end of the guide column is provided with a sliding sleeve, the second end of the guide column passes through the guide groove and the sliding groove rod and is slidably connected with the guide rod through the sliding sleeve, the end of the guide rod away from the sliding groove slides along the first sliding groove, the driving member is connected with the guide plate and is rotationally connected with the sliding groove rod through the output end, the bottom of the connecting block is connected with a rectangular plate, and the rectangular plate is connected with the second guide structure.

[0030] Specifically, the first end of the guide column is connected with the connecting block, the second end of the guide column passes through the guide groove, the guide groove is a through groove, the second end of the guide column is fixed with a sliding sleeve, the sliding sleeve is sleeved on the guide rod, the sliding sleeve slides with the guide rod, the other end of the guide rod slides on the first sliding groove of the guide plate, the guide rod plays a guiding and restraining role on the guide column, the driving member is a motor, the motor is arranged at the center of the guide plate, the output end of the motor is rotationally connected with the sliding groove rod, the motor drives the sliding groove rod to rotate, the sliding groove rod has a hollow groove, the sliding groove rod is connected with the guide column through the sliding groove, the sliding groove rod rotates around the motor, the sliding groove rod can drive the guide column to move on the guide groove, and the second guide structure is arranged on the rectangular plate at the bottom of the connecting block, so that the first guide structure can drive the second guide structure to rise and fall.

[0031] In some embodiments, the guide groove is a U-shaped groove, the U-shaped groove includes a horizontal section and two vertical sections, and the first sliding groove is located below the vertical section and parallel to the horizontal section.

[0032] Specifically, the guide groove extends in the vertical direction and the horizontal direction, the two ends of the horizontal section are connected with the two vertical sections, as the guide column moves in the guide groove in the order of the vertical section, the horizontal section and the vertical section, the collecting box realizes the moving track of rising, translating and descending, when the motor reversely rotates, the collecting box realizes the moving track of rising, translating and descending, and the first sliding groove is arranged below the vertical section and maintains a certain distance from the vertical section.

[0033] In some embodiments, the guide rod is an L-shaped rod, the short rod of the L-shaped rod enters the first sliding groove, and the long rod of the L-shaped rod is sleeved with the sliding sleeve and is slidably connected with the sliding sleeve.

[0034] Specifically, the guide rod is an L-shaped rod, which is convenient for providing a rotating space for the sliding groove rod and being connected with the first sliding groove, and the length of the short rod is greater than the sum of the first sliding groove depth and the sliding groove rod width.

[0035] In some embodiments, the second guiding structure comprises a slide rod, a second driving member, a first connecting rod and a second connecting rod, two ends of the slide rod are respectively connected with the collecting boxes in sliding mode, the second driving member is connected with the end of the connecting block, the output end of the second driving member is connected with the middle part of the second connecting rod, two ends of the second connecting rod are respectively connected with the first ends of the first connecting rods in pivotable mode, the second end of the first connecting rod is pivotably connected with the collecting box.

[0036] Specifically, the second driving member of the second guiding structure is an electric motor, the output end of the electric motor is connected with the middle part of the second connecting rod, the electric motor drives the second connecting rod to rotate, two ends of the second connecting rod are both rotatably connected with a first connecting rod, the other end of the first connecting rod is rotatably connected with the collecting box through a pin shaft, a fixed block is arranged on the collecting box and is connected with the slide rod in sliding mode. When the electric motor rotates, the second connecting rod drives the first connecting rod to rotate, when the second connecting rod rotates to shorten the distance between the first connecting rods, the two collecting boxes move relative to each other, when the second connecting rod rotates to increase the distance between the first connecting rods, the two collecting boxes move away from each other.

[0037] In some embodiments, the two collecting boxes are arranged oppositely, and the end of the connecting block extends in a direction perpendicular to the axial direction of the slide rod.

[0038] Specifically, the collecting box has an opening, the openings of the two collecting boxes are opposite, and the end of the connecting block extends towards the collecting box so that the second connecting rod and the electric motor are located at the middle position of the two collecting boxes, which can better drive the collecting boxes to move close to each other.

[0039] In some embodiments, the height adjusting mechanism comprises an adjusting plate, a third driving member, a third connecting rod, a fourth connecting rod and a sliding groove member, the sliding groove member is located at the bottom of the workbench and the top of the adjusting plate, the first end of the fourth connecting rod is slidably connected with the workbench through the sliding groove member, the second end of the fourth connecting rod is pivotably connected with the adjusting plate, the first end of the third connecting rod is pivotably connected with the bottom of the workbench, the second end of the third connecting rod is slidably connected with the adjusting plate through the sliding groove member, the second end of the third connecting rod corresponds to the first end of the fourth connecting rod, the output end of the third driving member is connected with a sliding block, and the sliding block is connected with the second end of the third connecting rod.

[0040] Specifically, the third driving member can be an electric push rod, a hydraulic push rod or other linear driving device, the third connecting rod and the fourth connecting rod intersect, the third connecting rod and the fourth connecting rod are arranged between the bottom of the workbench and the adjusting plate, the sliding groove member is arranged on the same side of the adjusting plate and the workbench, the output end of the electric push rod is connected with the sliding block, the sliding block drives the second end of the third connecting rod to slide in the sliding groove member, as the third connecting rod slides in the sliding groove member, the angle of the third connecting rod relative to the adjusting plate changes, when the angle increases, the third connecting rod and the fourth connecting rod cooperate to lift the workbench, and when the angle decreases, the third connecting rod and the fourth connecting rod cooperate to lower the workbench.

[0041] In some embodiments, the sliding groove piece has a through slot, a pin shaft passes through the sliding block and the through slots of the two sliding groove pieces in the same plane, and the two ends of the pin shaft are connected to the second end of the first connecting rod or the first end of the fourth connecting rod.

[0042] Specifically, two third connecting rods, two fourth connecting rods and four sliding groove pieces are arranged between the workbench and the adjusting plate, the sliding groove pieces are arranged on the bottom surface of the workbench and the adjusting plate in pairs, an electric push rod is arranged on the adjusting plate, a pin shaft passes through the sliding block and is in sliding fit with the two sliding groove pieces on the adjusting plate, a pin shaft is in sliding fit with the two sliding groove pieces on the bottom of the workbench, the through slots of the sliding groove pieces limit the movement range of the third connecting rod and the fourth connecting rod, the electric push rod drives the sliding block to move and drives the third connecting rod to move, and the third connecting rod drives the fourth connecting rod to move.

[0043] In some embodiments, the extension direction of the through slot is the same as the movement direction of the third driving piece, and the middle parts of the third connecting rod and the fourth connecting rod are rotationally connected.

[0044] Specifically, the middle parts of the third connecting rod and the fourth connecting rod are rotationally connected by a pin to form a scissors structure, and the extension direction of the through slot is the same as the movement direction of the electric push rod, so that when the electric push rod is elongated, the end part of the third connecting rod moves correspondingly in the through slot.

[0045] In some embodiments, the steering adjusting mechanism comprises a bottom plate, a rotating shaft, a first gear, a second gear and a fourth driving piece, the first end of the rotating shaft is connected to the adjusting plate, the second end of the rotating shaft is pivotally connected to the bottom plate, the first gear is sleeved on the rotating shaft, the fourth driving piece is located on the bottom plate, the second gear is sleeved on the output end of the fourth driving piece, and the first gear and the second gear are engaged.

[0046] Specifically, the steering mechanism supports the workbench and the height adjusting mechanism through the bottom plate, the fourth driving piece is an electric motor, the electric motor drives the second gear to rotate, the second gear is engaged with the first gear and drives the first gear to rotate, the first gear is fixedly connected to the rotating shaft, the first gear drives the rotating shaft to rotate, the rotating shaft is fixedly connected to the adjusting plate, the rotating shaft is rotationally connected to the bottom plate, the rotating shaft drives the adjusting plate to rotate and further drives the workbench to rotate, thereby changing the unloading direction.

[0047] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0051] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" or "including" and their derivatives, mean "including but not limited to". The terms "coupled" and "connected", along with their derivatives, mean "directly or indirectly connected".

[0052] Although the embodiments of the present disclosure have been shown and described above, it should be understood by those having ordinary skill in the art that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure, and the changes, modifications, replacements, and variations made by those having ordinary skill in the art to the above-mentioned embodiments are within the protection scope of the present disclosure.

Claims

1. An automatic unloading device for an unattended ship unloader, characterized by, The utility model relates to a kind of loading mechanism, including: workbench, height adjusting mechanism, steering adjusting mechanism, loading mechanism, the height adjusting mechanism is connected with the bottom of the workbench, the height adjusting mechanism includes adjusting plate, third driving part, third connecting rod, fourth connecting rod and sliding groove piece, the sliding groove piece is located in the bottom of the workbench and the top of the adjusting plate, fourth connecting rod's first end is slidably connected with the workbench by the sliding groove piece, fourth connecting rod's second end is pivotably connected with the adjusting plate, the first end of the third connecting rod is pivotably connected with the bottom of the workbench, the second end of the third connecting rod is slidably connected with the adjusting plate by sliding groove piece, the second end of the third connecting rod corresponds with the first end of the fourth connecting rod, the output end of third driving part is connected with slider, and the slider is connected with the second end of the third connecting rod;The steering adjusting mechanism is connected with the bottom of the height adjusting mechanism, and the steering adjusting mechanism includes bottom plate, rotating shaft, first gear, second gear and fourth driving part, the first end of the rotating shaft is connected with adjusting plate, the second end of the rotating shaft is pivotably connected with the bottom plate, the first gear is sleeved on the rotating shaft, the fourth driving part is located on the bottom plate, the output end of the fourth driving part is sleeved with the second gear, and the first gear and the second gear are engaged; The loading mechanism is located on the top of the workbench, and the loading mechanism includes guide plate, collection box and unloading box, the unloading box is slidably connected with the guide plate by first guide structure, the collection box is located at the both ends of second guide structure, and two collection boxes move relative to second guide structure, the guide plate is provided with guide slot and first sliding groove, the first guide structure includes guide column, sliding groove rod, driving part and guide rod, the first end of the guide column is connected with connecting block, the second end of the guide column is provided with sliding sleeve, the second end of the guide column passes through the guide slot and the sliding groove rod and is slidably connected with the guide rod by the sliding sleeve, the end of the guide rod away from sliding groove slides along the first sliding groove, the driving part is connected with the guide plate and is pivotably connected with the sliding groove rod by output end, the bottom of the connecting block is connected with rectangular plate, the rectangular plate is connected with second guide structure, the guide slot is U-shaped slot, the U-shaped slot includes horizontal section and two vertical sections, the first sliding groove is located below the vertical section and is parallel with the horizontal section, the guide rod is L-shaped rod, the short rod of the L-shaped rod enters the first sliding groove, the long rod of the L-shaped rod is sleeved with the sliding sleeve and is slidably connected with the sliding sleeve, the second guide structure includes sliding rod, second driving part, first connecting rod and second connecting rod, the both ends of the sliding rod are slidably connected with collection box respectively, the second driving part is connected with the end of the connecting block, the output end of the second driving part is connected with the middle part of the second connecting rod, the both ends of the second connecting rod are pivotably connected with the first end of the first connecting rod respectively, and the second end of the first connecting rod is pivotably connected with the collection box. Two collection boxes are oppositely arranged, and the end of the connecting block extends in the direction perpendicular to the axial direction of the sliding rod. ​ ​ 2. The automatic unloading device for the unattended ship unloader according to claim 1, characterized in that, ​ 3. The automatic unloading device for the unattended ship unloader according to claim 1, characterized in that, The sliding groove piece has a through slot, a pin shaft passes through the sliding block and the through slots of the two sliding groove pieces in the same plane, and two ends of the pin shaft are connected with the second end of the third connecting rod or the first end of the fourth connecting rod.

4. The automatic unloading device for the unattended ship unloader according to claim 3, characterized in that, The extension direction of the through slot is the same as the moving direction of the third driving piece, and the middle part of the third connecting rod is rotationally connected with the middle part of the fourth connecting rod.

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