A cart for transporting a display screen

Abstract

A kind of trolley for transporting display screen, for transporting multiple display screen boxes, the trolley includes load floor, side support frame, movable baffle and latch device, the load floor is provided with floor latch, the floor latch is used to be connected with the socket of the bottom of the display screen box, the side support frame is detachably mounted on the load floor, the movable baffle is movably connected to the side support frame, the latch device includes limiting component and elastic lock pin component, the limiting component and elastic lock pin component are all installed on the movable baffle, the limiting component is configured to be assembled with the side support frame in multiple positions so that the movable baffle can be in the position close to or away from the side of the display screen box, the elastic lock pin component is configured to be inserted and fixed with the socket of the side of the display screen box, and the trolley has the characteristics of stable and reliable, and can be assembled with the box.

Description

Technical Field

[0001] This utility model relates to the field of display screen technology, and specifically to a trolley for transporting display screens. Background Technology

[0002] With the development of the times, display screens are widely used in government squares, National Day celebrations, leisure squares, large entertainment squares, bustling commercial centers, advertising information boards, commercial streets, railway stations, waiting rooms, performing arts centers, live television broadcasts, exhibition halls, concert venues and other places.

[0003] Traditional display screen transfer trolleys typically transport multiple individual display screens. After arriving at the work site, these individual display screens need to be unloaded and then reassembled into a combined screen. This results in low on-site installation efficiency and is time-consuming and labor-intensive. Therefore, there is an urgent need for a transfer trolley for display screens to solve these problems. Utility Model Content

[0004] In view of this, a sturdy and reliable trolley for transporting display screens that can be fitted with modular cases is provided.

[0005] A trolley for transporting multiple display screen housings includes a load-bearing base plate, side support frames, a movable baffle, and a pin device. The load-bearing base plate has a base plate pin for connecting to a socket on the bottom of the display screen housing. The side support frames are detachably mounted on the load-bearing base plate, and the movable baffle is movably connected to the side support frames. The pin device includes a limiting component and a resilient locking pin component, both of which are mounted on the movable baffle. The limiting component is configured to be assembled with the side support frames at multiple positions, allowing the movable baffle to be positioned close to or away from the side of the display screen housing. The resilient locking pin component is configured to be inserted and fixed into a socket on the side of the display screen housing.

[0006] Furthermore, the elastic locking pin assembly includes a locking plate mounting base, a locking cover, a pressing locking plate, a first elastic element, and a locking pin. The locking plate mounting base is connected to the locking cover and the movable baffle respectively. The pressing locking plate includes a pressing part and a locking plate part connected to the pressing part. The locking plate part is installed between the locking plate mounting base and the locking cover. The locking plate part has a locking hole. The locking pin passes through the locking hole and is connected to the locking plate mounting base through the first elastic element.

[0007] Furthermore, the locking pin is provided with a slot, the movable baffle is provided with a through hole corresponding to the locking pin, and the elastic locking pin assembly also includes a second elastic element. One end of the second elastic element acts on the locking plate part, and the other end acts on the locking plate mounting seat. When the locking pin is pushed through the through hole and inserted into the insertion hole on the side of the display screen cabinet, the locking plate part, under the elastic force of the second elastic element, causes the edge of the locking hole to automatically engage and fix with the slot, thereby fixing the locking pin to the insertion hole on the side of the display screen cabinet.

[0008] Furthermore, the elastic locking pin assembly also includes a limiting plate, which is mounted on the locking plate mounting seat. The limiting plate is provided with a limiting protrusion, and the locking pin is provided with a limiting groove. The limiting protrusion is used to cooperate with the limiting groove to limit the locking pin and prevent the locking pin from disengaging from the locking plate mounting seat. The length of the limiting groove extends from the slot to another end, and the end has a stop groove wall.

[0009] Furthermore, the movable baffle is provided with multiple visual observation windows, each of which has a hollow structure. Each visual observation window corresponds to one of the display screen housings. The movable baffle includes a baffle body, upper and lower side plates vertically connected to the upper and lower sides of the baffle body, and left and right side plates vertically connected to the left and right sides of the baffle body. The baffle body is used to set the elastic locking pin assembly and the visual observation windows. The upper and lower side plates are used to install the baffle handle, and the left and right side plates are used to install the limiting assembly.

[0010] Furthermore, the limiting component includes a limiting screw and a limiting pin. The side support frame is provided with a movable guide groove, a locking limiting hole, and an unlocking limiting hole. The limiting screw is threaded to the inner side of the movable baffle and passes through the movable baffle to connect with the movable guide groove. The limiting pin is threaded to the inner side of the movable baffle and passes through the movable baffle, selectively connecting with the locking limiting hole or the unlocking limiting hole. The length direction of the movable guide groove is perpendicular to the length direction of the movable baffle.

[0011] Furthermore, the limiting pin includes a pin sleeve, a pull ring, a pull rod, and a third elastic element. The pin sleeve is threadedly connected to the movable baffle, and the pull rod is elastically connected to the pin sleeve through the third elastic element. The end of the pin sleeve is provided with a straight opening, and the pull rod is connected to the straight opening. The pull rod is connected to the pull ring.

[0012] Furthermore, when the pull ring is pulled and rotated until it is perpendicular to the straight opening, the pull ring abuts against the straight opening, causing the lever of the limiting pin to retract into the movable baffle and remain in the retracted state. When the pull ring is parallel to the straight opening, the lever passes through the movable baffle and is inserted into the locking limiting hole or the unlocking limiting hole under the action of the third elastic element.

[0013] Furthermore, the trolley also includes foam, which is attached to the side of the movable baffle facing the display screen housing.

[0014] Furthermore, the locking limit hole and the unlocking limit hole are arranged in a direction parallel to the movable guide groove, and the distance between the locking limit hole and the unlocking limit hole is less than the length of the movable guide groove; the side support frame cooperates with at least two sets of the pin devices in the vertical direction, and the two ends of the movable baffle in the length direction are assembled to the two side support frames through the limiting components.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: This type of transport display trolley uses an elastic locking pin assembly to connect and fix the display cabinet to the insertion hole on the side, achieving a stable lock between the cabinet and the trolley and preventing shaking during transportation. Specifically, the elastic locking pin assembly uses a second elastic element to automatically engage the locking pin's slot with the edge of the locking hole, thus achieving a stable and reliable connection between the locking pin and the insertion hole on the side of the display cabinet. When unlocking is required, pressing the pressing part causes the locking pin's slot to disengage from the edge of the locking hole. Under the action of the first elastic element, the locking pin resets and retracts, quickly disengaging from the insertion hole on the side of the display cabinet to unlock. The operation is simple. Moreover, each set of locking pin devices corresponds to one display cabinet unit, and the side support frame cooperates with at least two sets of locking pin devices in the vertical direction, enabling the trolley to transport display cabinet units formed by vertically splicing multiple display cabinet units. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a trolley for loading a display screen housing according to an embodiment of the present utility model.

[0017] Figure 2 yes Figure 1 A magnified view of part A in the diagram.

[0018] Figure 3 This is an exploded view of the structure of a trolley for a transfer display screen according to an embodiment of this utility model.

[0019] Figure 4 yes Figure 3 A magnified view of part B in the diagram.

[0020] Figure 5 This is an exploded view of the elastic locking pin assembly of a trolley for a transfer display screen according to an embodiment of the present invention.

[0021] Figure 6 This is an exploded view of the structure of the limiting pin of a trolley for a transfer display screen according to an embodiment of this utility model.

[0022] Figure 7 This is a three-dimensional structural diagram of the movable baffle of a trolley for a transfer display screen according to an embodiment of the present invention.

[0023] Figure 8 This is a cross-sectional schematic diagram showing the locking pin of a trolley for transporting a display screen in connection with the insertion hole on the side of the display screen housing, according to an embodiment of this utility model.

[0024] Figure 9 yes Figure 8 A magnified view of part C in the diagram.

[0025] Figure 10 This is a cross-sectional schematic diagram of the locking pin of a trolley for transporting a display screen in an embodiment of the present invention, showing the state of the trolley being disconnected from the insertion hole on the side of the display screen housing.

[0026] Figure 11 yes Figure 10 A magnified view of part D in the middle.

[0027] 1. Display screen housing; 2. Load-bearing base plate; 3. Side support frame; 4. Movable baffle; 5. Base plate pin; 6. Lock plate mounting seat; 7. Lock cover; 8. Press-lock plate; 9. First elastic element; 10. Locking pin; 11. Pressing part; 12. Lock plate part; 13. Lock hole; 14. Slot; 15. Second elastic element; 16. Limiting plate; 17. Limiting protrusion; 18. Limiting groove; 19. Visual observation window; 20. Limiting screw; 1. Limit pin; 22. Movable guide groove; 23. Locking limit hole; 24. Unlocking limit hole; 25. Pin sleeve; 26. Pull ring; 27. Pull rod; 28. Third elastic element; 29. ​​Straight opening; 30. Foam; 31. Baffle body; 32. Upper and lower side plates; 33. Left and right side plates; 34. Baffle handle; 35. First connecting hole; 36. Second connecting hole; 37. Third connecting hole; 38. Fourth connecting hole; 39. Through hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1 to 11 This illustration shows a trolley for transporting multiple display screen housings 1, provided by an embodiment of the present invention. The trolley includes a load-bearing base plate 2, side support frames 3, movable baffles 4, and a pin device. The load-bearing base plate 2 is provided with a base plate pin 5, which is used to connect with the insertion hole at the bottom of the display screen housing 1. The side support frames 3 are detachably mounted on the load-bearing base plate 2, and the movable baffles 4 are movably connected to the side support frames 3. The pin device includes a limiting component and an elastic locking pin component, both of which are installed on the movable baffles 4. The limiting component is configured to be assembled with the side support frames 3 at multiple positions so that the movable baffles 4 can be positioned close to or away from the side of the display screen housing 1. The elastic locking pin component is configured to be inserted and fixed into the insertion hole on the side of the display screen housing 1.

[0030] Specifically, the elastic locking pin assembly includes a locking plate mounting base 6, a locking cover 7, a pressing locking plate 8, a first elastic element 9, and a locking pin 10. The locking plate mounting base 6 is connected to the locking cover 7 and the movable baffle 4 respectively. The pressing locking plate includes a pressing part 11 and a locking plate part 12 connected to the pressing part 11. The locking plate part 12 is installed between the locking plate mounting base 6 and the locking cover 7. The locking plate part 12 is provided with a locking hole 13. The locking pin 10 passes through the locking hole 13 and is connected to the locking plate mounting base 6 through the first elastic element 9.

[0031] More specifically, the locking pin 10 is provided with a slot 14, the movable baffle 4 is provided with a through hole 39 corresponding to the locking pin 10, and the elastic locking pin assembly also includes a second elastic element 15. One end of the second elastic element 15 acts on the locking plate part 12, and the other end acts on the locking plate mounting seat 6. When the locking pin 10 is pushed through the through hole 39 and inserted into the insertion hole on the side of the display screen cabinet 1, the locking plate part 12, under the elastic force of the second elastic element 15, causes the edge of the locking hole 13 to automatically engage and fix with the slot 14, thereby fixing the locking pin 10 to the insertion hole on the side of the display screen cabinet 1. Preferably, the locking plate mounting base 6 is provided with two elastic element receiving grooves. The second elastic element 15 is made of two springs, which are respectively installed in the two elastic element receiving grooves. The two elastic element receiving grooves are symmetrically arranged on the upper and lower sides of the inner wall of the locking plate mounting base 6 so that the locking plate part 12 is subjected to the uniform elastic force of the two springs, avoiding the situation where the locking plate part 12 is only subjected to the elastic force on one side and deflects. Moreover, the double spring structure can disperse the fatigue wear of the springs and extend the service life of the elastic element.

[0032] In some specific embodiments, the second elastic element 15 is initially in a compressed and energy-storing state. When the locking pin 10 is pushed by hand until it extends into the insertion hole on the side of the display screen housing 1, the slot 14 of the locking pin 10 moves to the corresponding lock hole 13. At this time, the second elastic element 15 releases its elastic force, pushing the locking plate 12 to automatically engage the edge of the lock hole 13 with the slot 14 of the locking pin 10, thereby fixing the locking pin 10 to the insertion hole on the side of the display screen housing 1. At this time, the first elastic element 9 is in a compressed and energy-storing state. When it is necessary to remove the locking pin 10 from the insertion state, it is only necessary to press the pressing part 11. The pressing part 11 drives the locking plate 12 to move in the direction of compressing the second elastic element 15, thereby disengaging the edge of the lock hole 13 from the slot 14 of the locking pin 10 and releasing the engagement. After disengagement, the elastic force of the first elastic element 9 is released, and under the action of the elastic force of the first elastic element 9, the locking pin 10 is reset and withdrawn. More specifically, when locking the display screen housing 1 to the side, first move the movable baffle 4 until the pull rod 27 is aligned with the locking limit hole 23, then insert the pull rod 27 into the locking limit hole 23 to position the movable baffle 4, and finally push the locking pin 10 until it extends into the insertion hole on the side of the display screen housing 1 to lock it; when unlocking the display screen housing 1 to the side, first move the movable baffle 4 until the pull rod 27 is aligned with the unlocking limit hole 24, then insert the pull rod 27 into the unlocking limit hole 24 to position the movable baffle 4, and finally press the pressing part 11 to reset and retract the locking pin 10. At this time, the display screen housing 1 can be lifted upwards and removed from the trolley after disengaging from the bottom plate pin 5.

[0033] More specifically, the elastic locking pin assembly further includes a limiting plate 16, which is mounted on the locking plate mounting base 6. The limiting plate 16 is provided with a limiting protrusion 17, and the locking pin 10 is provided with a limiting groove 18. The limiting protrusion 17 is used to cooperate with the limiting groove 18 to limit the locking pin 10 to prevent the locking pin 10 from disengaging from the locking plate mounting base 6. The length of the limiting groove 18 extends from the slot 14 to another end, and the end has a stop groove wall.

[0034] Specifically, the movable baffle 4 is provided with multiple visual observation windows 19, each of which has a hollow structure, and each visual observation window 19 corresponds to one of the display screen housings 1. The visual observation windows 19 are used to observe the internal structure of the trolley from the outside. The movable baffle 4 includes a baffle body 31, upper and lower side plates 32 vertically connected to the upper and lower sides of the baffle body 31, and left and right side plates 33 vertically connected to the left and right sides of the baffle body 31. The baffle body 31 is used to set the elastic locking pin assembly and the visual observation windows 19. The upper and lower side plates 32 are used to install the baffle handle 34, and the left and right side plates 33 are used to install the limiting assembly. More specifically, the movable baffle 4 as a whole... It has a box-shaped structure. The baffle body 31 is the bottom of the box, and the upper and lower side plates 32 and the left and right side plates 33 are the sides of the box. The baffle body 31 is provided with a first connecting hole 35 and a through hole 39. The locking plate mounting seat 6 is connected to the first connecting hole 35, and the locking pin 10 passes through the through hole 39. The left and right side plates 33 are provided with a second connecting hole 36 and a third connecting hole 37. The limiting screw 20 is connected to the second connecting hole 36, and the limiting pin 21 is connected to the third connecting hole 37. The upper and lower side plates 32 are provided with a fourth connecting hole 38, and the baffle handle 34 is connected to the fourth connecting hole 38.

[0035] Specifically, the limiting component includes a limiting screw 20 and a limiting pin 21. The side support frame 3 is provided with a movable guide groove 22, a locking limiting hole 23 and an unlocking limiting hole 24. The limiting screw 20 is threaded to the inner side of the movable baffle 4 and passes through the movable baffle 4 to connect with the movable guide groove 22. The limiting pin 21 is threaded to the inner side of the movable baffle 4 and passes through the movable baffle 4 to selectively connect with the locking limiting hole 23 or the unlocking limiting hole 24. The length direction of the movable guide groove 22 is perpendicular to the length direction of the movable baffle 4.

[0036] More specifically, the limiting pin 21 includes a pin sleeve 25, a pull ring 26, a pull rod 27, and a third elastic element 28. The pin sleeve 25 is threadedly connected to the movable baffle 4. The pull rod 26 is elastically connected to the pin sleeve 25 through the third elastic element 28. The end of the pin sleeve 25 is provided with a straight opening 29. The pull rod 27 is connected to the straight opening 29 and is connected to the pull ring 26. In some specific embodiments, the pull rod 27 includes a thicker rod portion and a thinner rod portion. The pin sleeve 25 has a through hole. The thicker rod portion passes through the through hole and protrudes from the other end of the pin sleeve 25 away from the inverted opening 29. The thinner rod portion is connected to the pull ring 26. A third elastic element 28 is sleeved on the pull rod 27. One end of the third elastic element 28 acts on the pull rod 27, and the other end acts on the pin sleeve 25. Specifically, the third elastic element 28 can be sleeved on the thinner rod portion of the pull rod 27, and one end is bonded to the bottom end of the inverted opening 29, and the other end is bonded to the connection between the thinner rod portion and the pull ring 26. At the connection point, in the initial state, the thicker part of the pull rod 27 protrudes from the sleeve 25. When the pull ring 26 is pulled outward and rotated to the vertical I-shaped opening 29, the pull ring 26 is locked in the I-shaped opening 29. At this time, the third elastic element 28 stretches and stores force, and the thicker part of the pull rod 27 retracts into the sleeve 25 simultaneously. When the pull ring 26 is rotated to be parallel to the I-shaped opening 29, the lock of the pull ring 26 is released. Under the action of the restoring force of the third elastic element 28, the thicker part of the pull rod 27 returns to its original position and protrudes from the sleeve 25, so that it can be inserted into the locking limit hole 23 or the unlocking limit hole 24.

[0037] More specifically, when the pull ring 26 is pulled and rotated until it is perpendicular to the straight opening 29, the pull ring 26 abuts against the straight opening 29, causing the pull rod 27 of the limiting pin 21 to retract into the movable baffle 4 and remain in the retracted state. At this time, the limiting screw 20 is loosened, and the limiting screw 20 can move laterally in the movable guide groove 22, causing the movable baffle 4 to move towards or away from the side of the display screen housing 1. When the pull ring 26 is parallel to the straight opening 29, the pull rod 27 passes through the movable baffle 4 under the action of the third elastic member 28 and is inserted into the locking limiting hole 23 or the unlocking limiting hole 24. More specifically, the lateral movement of the limiting screw 20 in the movable guide groove 22 causes the movable baffle 4 to move towards the side of the display screen housing 1. When the pull rod 27 is aligned with the locking limiting hole 23, the pull ring 26 is parallel to the straight opening 29, and the pull rod 27 is inserted into the locking limiting hole 23. At the same time, the foam 30 clamps the side of the display screen housing 1. Similarly, the lateral movement of the limiting screw 20 in the movable guide groove 22 causes the movable baffle 4 to move away from the side of the display screen housing 1. When the pull rod 27 is aligned with the unlocking limiting hole 24, the pull ring 26 is parallel to the straight opening 29, and the pull rod 27 is inserted into the unlocking limiting hole 24. At the same time, a gap appears between the foam 30 and the side of the display screen housing 1, and the side of the display screen housing 1 is no longer pressed by the foam 30.

[0038] Specifically, the trolley also includes foam 30, which is attached to the side of the movable baffle 4 facing the display screen housing 1. The foam 30 is preferably EVA foam, which is used to clamp the movable baffle 4 between the movable baffle 4 and the display screen housing 1 to absorb vibration, thereby preventing the display screen housing 1 from loosening and avoiding impact damage.

[0039] More specifically, the locking limit hole 23 and the unlocking limit hole 24 are arranged in a direction parallel to the movable guide groove 22, and the distance between the locking limit hole 23 and the unlocking limit hole 24 is less than the length of the movable guide groove 22, so that the translation range of the pull rod 27 of the limit pin 21 can completely cover the locking limit hole 23 and the unlocking limit hole 24, and thus the pull rod 27 can be inserted into the locking limit hole 23 or the unlocking limit hole 24 respectively; the side support frame 3 cooperates with at least two sets of the pin devices in the vertical direction, and each set of pin devices is correspondingly inserted and fixed to a display screen unit cabinet. The two or more sets of pin devices in the vertical direction of the side support frame 3 can be correspondingly inserted and fixed to the combined cabinet formed by vertically splicing two or more display screen unit cabinets, that is, the trolley supports the transportation of the combined cabinet, and the combined cabinet can be directly removed as a whole during disassembly, which greatly saves the on-site assembly time and improves the on-site installation efficiency. The two ends of the movable baffle 4 in the length direction are assembled to the two side support frames 3 through the limit components.

[0040] In summary, this type of transport display trolley is fixed to the display cabinet 1 by inserting the elastic locking pin assembly into the insertion hole on the side, thus achieving a stable lock between the cabinet and the trolley and preventing shaking during transportation. Specifically, the elastic locking pin assembly uses a second elastic element 15 to automatically engage the locking pin 10's slot 14 with the edge of the locking hole 13, thereby fixing the locking pin 10 to the insertion hole on the side of the display cabinet 1. This is stable and reliable. When unlocking is required, pressing the pressing part 11 causes the locking pin 10's slot 14 to disengage from the edge of the locking hole 13. Under the action of the first elastic element 9, the locking pin 10 resets and retracts, quickly disengaging from the insertion hole on the side of the display cabinet 1 to unlock. The operation is simple. Moreover, each set of pin devices corresponds to one display cabinet unit, and the side support frame 3 cooperates with at least two sets of the aforementioned pin devices in the vertical direction, enabling the trolley to transport display cabinet units formed by vertically splicing multiple display cabinet units.

[0041] It should be noted that this utility model is not limited to the above-described embodiments. Based on the inventive spirit of this utility model, those skilled in the art can make other changes, and these changes made based on the inventive spirit of this utility model should be included within the scope of protection claimed by this utility model.

Claims

1. A trolley for transporting display screens, used to transport multiple display screen housings, characterized in that, The trolley includes a load-bearing base plate, side support frames, a movable baffle, and a pin device. The load-bearing base plate is provided with a base plate pin, which is used to connect with the insertion hole at the bottom of the display screen housing. The side support frames are detachably mounted on the load-bearing base plate, and the movable baffle is movably connected to the side support frames. The pin device includes a limiting component and an elastic locking pin component, both of which are installed on the movable baffle. The limiting component is configured to be assembled with the side support frames in multiple positions so that the movable baffle can be positioned close to or away from the side of the display screen housing. The elastic locking pin component is configured to be inserted and fixed into the insertion hole on the side of the display screen housing.

2. The trolley for transferring a display screen as described in claim 1, characterized in that, The elastic locking pin assembly includes a locking plate mounting base, a locking cover, a pressing locking plate, a first elastic element, and a locking pin. The locking plate mounting base is connected to the locking cover and the movable baffle respectively. The pressing locking plate includes a pressing part and a locking plate part connected to the pressing part. The locking plate part is installed between the locking plate mounting base and the locking cover. The locking plate part has a locking hole. The locking pin passes through the locking hole and is connected to the locking plate mounting base through the first elastic element.

3. The trolley for transferring a display screen as described in claim 2, characterized in that, The locking pin has a slot, and the movable baffle has a through hole corresponding to the locking pin. The elastic locking pin assembly also includes a second elastic element. One end of the second elastic element acts on the locking plate part, and the other end acts on the locking plate mounting seat. When the locking pin is pushed through the through hole and inserted into the insertion hole on the side of the display screen cabinet, the locking plate part, under the elastic force of the second elastic element, causes the edge of the locking hole to automatically engage and fix with the slot, thereby fixing the locking pin to the insertion hole on the side of the display screen cabinet.

4. The trolley for transferring a display screen as described in claim 3, characterized in that, The elastic locking pin assembly also includes a limiting plate, which is mounted on the locking plate mounting seat. The limiting plate is provided with a limiting protrusion, and the locking pin is provided with a limiting groove. The limiting protrusion is used to cooperate with the limiting groove to limit the locking pin and prevent the locking pin from disengaging from the locking plate mounting seat. The length of the limiting groove extends from the slot to another end, and the end has a stop groove wall.

5. The trolley for transferring a display screen as described in claim 1, characterized in that, The movable baffle is provided with multiple visual observation windows, each of which has a hollow structure. Each visual observation window corresponds to one of the display screen housings. The movable baffle includes a baffle body, upper and lower side plates vertically connected to the upper and lower sides of the baffle body, and left and right side plates vertically connected to the left and right sides of the baffle body. The baffle body is used to set the elastic locking pin assembly and the visual observation windows. The upper and lower side plates are used to install baffle handles, and the left and right side plates are used to install the limiting assembly.

6. The trolley for transferring a display screen as described in claim 1, characterized in that, The limiting assembly includes a limiting screw and a limiting pin. The side support frame is provided with a movable guide groove, a locking limiting hole, and an unlocking limiting hole. The limiting screw is threaded to the inner side of the movable baffle and passes through the movable baffle to connect with the movable guide groove. The limiting pin is threaded to the inner side of the movable baffle and passes through the movable baffle, selectively connecting with the locking limiting hole or the unlocking limiting hole. The length direction of the movable guide groove is perpendicular to the length direction of the movable baffle.

7. The trolley for transferring a display screen as described in claim 6, characterized in that, The limiting pin includes a pin sleeve, a pull ring, a pull rod, and a third elastic element. The pin sleeve is threadedly connected to the movable baffle. The pull rod is elastically connected to the pin sleeve through the third elastic element. The end of the pin sleeve has a straight opening. The pull rod is connected to the straight opening and is connected to the pull ring.

8. The trolley for transferring a display screen as described in claim 7, characterized in that, When the pull ring is pulled and rotated until it is perpendicular to the straight opening, the pull ring abuts against the straight opening, causing the pull rod of the limiting pin to retract into the movable baffle and remain in the retracted state. When the pull ring is parallel to the straight opening, the pull rod passes through the movable baffle and is inserted into the locking limiting hole or the unlocking limiting hole under the action of the third elastic element.

9. A trolley for transferring a display screen as described in claim 1, characterized in that, The trolley also includes foam, which is attached to the side of the movable baffle facing the display screen housing.

10. A trolley for transferring a display screen as described in claim 6, characterized in that, The locking limit hole and the unlocking limit hole are arranged in a direction parallel to the movable guide groove, and the distance between the locking limit hole and the unlocking limit hole is less than the length of the movable guide groove; the side support frame cooperates with at least two sets of the pin devices in the vertical direction, and the two ends of the movable baffle in the length direction are assembled to the two side support frames through the limiting components.

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