A small transport vehicle that is easy to use

Abstract

The utility model relates to the technical field of small transport vehicle, concretely relates to a small transport vehicle convenient to use, include: electric trolley chassis, the upper surface of electric trolley chassis is equipped with the openwork type bearing plate, the openwork type bearing plate one end is connected with electric trolley chassis between not less than 2's bolt type hinged component no.

Description

Technical Field

[0001] This utility model relates to the field of small transport vehicle technology, and in particular to a small transport vehicle that is easy to use. Background Technology

[0002] Small transport vehicles are typically used for short-distance, small-batch cargo transportation. Their dimensions, load capacity, power, and other parameters all meet specific standards. They mainly consist of a vehicle chassis, a cargo box, and wheels mounted on the chassis. To facilitate unloading, the cargo box and the vehicle chassis generally use a rotating connection structure, allowing the user to manually tilt the cargo box to one side to complete the unloading. At the same time, the side panels and load-bearing plates of the cargo box are hinged, making it easy to move goods into the cargo box after flipping the side panels.

[0003] Regarding the above-mentioned technology, the inventors discovered two problems: First, after the user drives the vehicle body to rotate at a certain angle so that the goods slide down the slope for unloading, the vehicle body needs to be pulled to swing back to its original position. After resetting, the vehicle body must be manually fixed to the vehicle chassis using a pin structure, which reduces the ease of operation. Second, when transporting large-volume, lightweight goods, the limited number of goods that can be transported at one time is due to the limiting effect of the side panels and the area limitation of the load-bearing plate, resulting in reduced transportation efficiency. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a small transport vehicle that is easy to use, thereby improving the convenience of operation and transportation efficiency.

[0005] To solve the above-mentioned technical problems, the present invention provides a convenient small transport vehicle, comprising: an electric trolley chassis with a rolling function; a hollowed-out support plate on the upper surface of the electric trolley chassis; at least two pin-type hinge components connecting one end of the hollowed-out support plate to the electric trolley chassis; a fixed side panel connected to one side of the hollowed-out support plate in the width direction; and flip-up side panels on the other three sides of the hollowed-out support plate. At least two pin-type hinge components connecting the flip-up side panels to the electric trolley chassis are respectively provided. Telescopic horizontal support frames are respectively provided below the flip-up side panels, and the telescopic horizontal support frames are respectively connected to the electric trolley chassis, suitable for supporting the flip-up side panels in a horizontal state. It also includes a drop-type self-locking mechanism, suitable for preventing the hollowed-out support plate from flipping and separating relative to the electric trolley chassis.

[0006] By adopting the above technical solution, goods are transported to the perforated support plate during use. The flip-up sideboards are then swung to a vertical position. The J-shaped rod sliding connection assembly detachably connects adjacent flip-up sideboards. Both ends of the fixed sideboards are detachably connected to their corresponding flip-up sideboards via the J-shaped rod sliding connection assembly. The use of both fixed and flip-up sideboards prevents goods from sliding off the perforated support plate. When unloading is required, since one end of the perforated support plate is connected to the electric trolley frame via a pin-type hinge assembly, forcefully driving the perforated support plate to swing at a certain angle and tilt it allows the goods to slide diagonally downwards along the slope of the perforated support plate, achieving rapid unloading. Next, pull the flip-up panel connected to the side of the perforated support plate. Under the combined force of the pull and the weight of the perforated support plate, the flip-up panel, and the fixed panel, the perforated support plate swings in the opposite direction and resets. Through the use of a drop-type self-locking mechanism, the perforated support plate is detachably connected to the electric trolley frame via a snap-fit ​​mechanism, achieving a locking effect. This eliminates the need for the user to operate the pin structure to connect the perforated support plate to the electric trolley frame, improving operational convenience. When transporting large, lightweight goods, operate the telescopic horizontal support frame to unfold it. Then, operate the flip-up panel to flip it outwards and connect it to the telescopic horizontal support frame. The flip-up panel is now horizontal and can be used as a load-bearing surface. Goods can be placed on the perforated support plate and the flip-up panel, expanding the load-bearing area, increasing the amount of goods transported at one time, and improving transportation efficiency.

[0007] In a preferred embodiment, the present invention can be further configured as follows: the falling self-locking mechanism includes a telescopic hand lever assembly, a hinged spring-loaded grip, and a U-shaped rod assembly; the hinged spring-loaded grip includes a slot that can engage with the U-shaped rod assembly; both the telescopic hand lever assembly and the U-shaped rod assembly are connected to the electric trolley frame; and the hinged spring-loaded grip is connected to the telescopic hand lever assembly.

[0008] By adopting the above technical solution, during the process of the hollowed-out support plate being pulled back to its original position, it will drive the telescopic handrail assembly to swing synchronously. The telescopic handrail assembly will then drive the hinged spring-loaded grip to swing. When the hinged spring-loaded grip contacts the U-shaped rod assembly, it will be squeezed, causing the slot to move accordingly. When the slot aligns with the U-shaped rod assembly, under the rebound force of the hinged spring-loaded grip, the slot will lock onto the telescopic handrail assembly, thereby preventing the telescopic handrail assembly from separating from the U-shaped rod assembly, ultimately achieving a locking effect. When the telescopic handrail assembly is gripped tightly by hand and its rebound force is overcome, the slot can be driven to separate from the U-shaped rod assembly, thereby causing the hollowed-out support plate to flip to an inclined state, thus achieving the purpose of detachably connecting the hollowed-out support plate and the electric trolley frame.

[0009] In a preferred embodiment, the present invention can be further configured as follows: the telescopic handheld rod assembly includes a rectangular plate, a circular tube connected to the rectangular plate, and a handheld rod slidably connected to the inner hole of the circular tube. The rectangular plate is connected to the bottom of the hollowed-out support plate. A nut is connected to the outer circle of the circular tube. A handle is internally threaded onto the nut. One end of the handle passes through the tube wall of the circular tube and is tightly connected to the handheld rod. A spring is sleeved on the outer circle of the screw of the handle.

[0010] By employing the above technical solution, after pulling the handle outward for axial sliding, rotating the handle fixes the handle to the cylindrical body. Gripping the handle and lifting it drives the perforated support plate to flip to an inclined state, increasing the distance between the force point and the pin-type hinge assembly, thus increasing the torque and achieving a labor-saving effect. Next, rotating the handle in the opposite direction pushes the handle in the opposite direction, preventing the user from colliding with the handle during walking. The use of a spring prevents the handle from becoming loose.

[0011] In a preferred embodiment, the present invention can be further configured as follows: the hinged spring-loaded grip includes a U-shaped base, a cylinder, and a grip rod. The grip rod is provided with the aforementioned slot. The U-shaped base is connected to a telescopic hand handle assembly. It also includes a round rod passing through the U-shaped base and a torsion spring with one end radially passing through the cylinder. One end of the grip rod extends into the U-shaped base and is fixedly connected to the round rod. The torsion spring is sleeved on the outer circles of both ends of the round rod. A limiting shaft passes through the U-shaped base. The other end of the torsion spring abuts against the outer circle of the limiting shaft. The U-shaped base is provided with a groove, and the cylinder is located in the groove.

[0012] By employing the above technical solution, the combined force of the tension and the gravity of the hollowed-out support plate, fixed railing, and flip-up railing overcomes the torsion of the torsion spring, ensuring precise alignment between the slot and the U-shaped rod assembly. Subsequently, the slot engages with the U-shaped rod assembly, achieving structural locking. By gripping the handle and overcoming the torsion of the torsion spring, the slot can be separated from the U-shaped rod assembly. At this point, the hollowed-out support plate can be freely flipped, completing the unlocking operation.

[0013] In a preferred embodiment, the present invention can be further configured such that: the U-shaped rod assembly includes a U-shaped fixing seat and a U-shaped rod body, both ends of the U-shaped rod body are connected to the U-shaped fixing seat, the U-shaped rod body is engaged in the slot, and the U-shaped fixing seat is connected to the electric trolley frame.

[0014] By adopting the above technical solution, the U-shaped rod is engaged in the slot to achieve the purpose of locking, and the U-shaped rod is separated from the slot to achieve the unlocking operation.

[0015] In a preferred embodiment, the present invention can be further configured as follows: the telescopic horizontal support frame includes a transverse tube and longitudinal tubes respectively connected to the lower planes at both ends thereon; a fixed tube body is slidably connected to the outer side of the longitudinal tube; the fixed tube body is connected to a hollow bearing plate; and an end plate is connected to the end of the longitudinal tube away from the transverse tube, which is suitable for preventing the longitudinal tube from detaching from the inner hole of the fixed tube body.

[0016] By adopting the above technical solution, during use, pulling the horizontal tube outward a certain distance causes the vertical tube to slide within the fixed tube body. The horizontal tube abuts against the corresponding tilting side panel, keeping the tilting side panel horizontal, facilitating the placement of goods on the tilting side panel and expanding the carrying capacity of the small transport vehicle.

[0017] In a preferred embodiment, the present invention can be further configured as follows: the pin-type hinge assembly includes a first U-shaped plate and connecting plates disposed on both sides thereof, the first U-shaped plate and the connecting plates are connected by a pin shaft, the first U-shaped plate is connected to a hollowed-out support plate, and the connecting plates are connected to the electric trolley chassis.

[0018] By adopting the above technical solution, since the first U-shaped plate and the connecting plate are connected by a pin, it is easy to flip the hollowed-out carrier plate, which improves the convenience of operation.

[0019] In a preferred embodiment, the present invention can be further configured as follows: the second pin-type hinge assembly includes a third U-shaped plate and a T-shaped plate, the two ends of the third U-shaped plate are respectively connected to a first sleeve, and a second sleeve fixed to the T-shaped plate is provided between the first sleeves. The first sleeve and the second sleeve are concentrically arranged and are provided with a compression-opening pin. The third U-shaped plate is connected to a flip-type railing, and the T-shaped plate is connected to a hollowed-out support plate.

[0020] By adopting the above technical solution, the extrusion-type open pin is inserted into the inner hole of sleeve one and sleeve two. Sleeve one is connected to the flip-type guardrail through the third U-shaped plate, and sleeve two is connected to the hollow-type support plate through the T-shaped plate, which facilitates the flip-type guardrail to flip relative to the hollow-type support plate and improves the convenience of operation.

[0021] In a preferred embodiment, the present invention can be further configured such that: the J-shaped rod sliding connection assembly includes an inverted J-shaped rod, with a limiting tube one and a limiting tube two respectively fitted on the two sides of the J-shaped rod, and a plastic handle threadedly connected to one end of the J-shaped rod.

[0022] By adopting the above technical solution, when the J-shaped rod is simultaneously inserted into the inner holes of limiting tube one and limiting tube two, a detachable connection can be achieved between adjacent flip-type railings, or a detachable connection can be achieved between a fixed railing and a corresponding flip-type railing. When one side of the J-shaped rod is moved out of the inner hole of limiting tube one, the disassembly of adjacent flip-type railings, or the disassembly of a fixed railing and a corresponding flip-type railing, can be easily completed. The overall structure is simple and easy to operate.

[0023] In summary, this utility model has at least one of the following beneficial technical effects: 1. The flip-up sideboard prevents goods from slipping. When unloading, tilting the load-bearing plate will allow the goods to slide down. After resetting, the falling self-locking mechanism will automatically lock, eliminating the need for manual pin operation and improving the convenience of operation.

[0024] 2. When transporting large-volume lightweight goods, unfolding the telescopic horizontal support frame and operating the flip-up sideboard to achieve a horizontal state can expand the load-bearing area, increase the single-trip cargo capacity, and improve transportation efficiency. The overall operation is simple and highly practical. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of a convenient small transport vehicle according to the present invention.

[0026] Figure 2 This is another structural schematic diagram of the present invention.

[0027] Figure 3 yes Figure 2 A schematic diagram of the structure of the middle pin-type hinge assembly.

[0028] Figure 4 yes Figure 1 A schematic diagram of the structure of the second type of middle pin hinge assembly.

[0029] Figure 5 yes Figure 1 A schematic diagram of the structure of a telescopic horizontal support frame.

[0030] Figure 6 yes Figure 2 Enlarged view of a portion of point A in the middle.

[0031] Figure 7 yes Figure 1 A schematic diagram of the connection between the hinged spring-loaded grip and the U-shaped bar assembly.

[0032] Figure 8 yes Figure 1 Another schematic diagram of the connection between the hinged spring-loaded grip and the U-shaped bar assembly.

[0033] In the diagram: 1. Electric trolley chassis; 2. Hollowed-out support plate; 30. Pin-type hinge assembly one; 40. Pin-type hinge assembly two; 50. Telescopic horizontal support frame; 60. Telescopic handrail assembly; 70. Hinged spring-loaded grip; 80. U-shaped rod assembly; 90. J-shaped rod sliding connection assembly; 11. Fixed guardrail; 12. Flip-up guardrail. 31. First U-shaped plate; 32. Connecting plate; 41. Third U-shaped plate; 42. T-shaped plate; 43. Sleeve 1; 44. Sleeve 2; 45. Press-opening pin; 51. Horizontal pipe; 52. Longitudinal pipe; 53. Fixed pipe body; 54. End plate; 61. Rectangular plate; 62. Circular tube; 63. Hand handle; 64. Handle; 65. Spring; 71. Slot; 72. U-shaped seat; 73. Handle bar; 74. Round rod; 75. Torsion spring; 76. Limiting shaft; 77. Groove; 78. Cylinder; 81. U-shaped fixing seat; 82. U-shaped rod; 91. J-shaped rod; 92. Limiting tube one; 93. Limiting tube two; 94. Plastic handle. Detailed Implementation

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] Reference Figures 1-8This utility model discloses a convenient small transport vehicle, comprising: an electric trolley chassis 1 with a rolling function; a hollowed-out support plate 2 on the upper surface of the electric trolley chassis 1; at least two pin-type hinge components 30 connecting one end of the hollowed-out support plate 2 to the electric trolley chassis 1; a fixed side panel 11 connected to one side of the hollowed-out support plate 2 in the width direction; and flip-up side panels 12 respectively provided on the other three sides of the hollowed-out support plate 2. At least two pin-type hinge components 40 connecting the flip-up side panels 12 to the electric trolley chassis 1; and J-shaped rod sliding connection components 90 connecting adjacent flip-up side panels 12. The two ends of the fixed side panel 11 are respectively connected to the corresponding flip-up side panel 12 by the aforementioned J-shaped rod sliding connection components 90.

[0037] The pin-type hinge assembly 30 includes a first U-shaped plate 31 and connecting plates 32 disposed on both sides thereof. The first U-shaped plate 31 and the connecting plates 32 are connected by a pin. The first U-shaped plate 31 is connected to the hollowed-out support plate 2, and the connecting plates 32 are connected to the electric trolley frame 1. Because the first U-shaped plate 31 and the connecting plates 32 are connected by a pin, the hollowed-out support plate 2 can be easily flipped, improving the convenience of operation.

[0038] The second pin-type hinge assembly 40 includes a third U-shaped plate 41 and a T-shaped plate 42. Both ends of the third U-shaped plate 41 are connected to sleeves 43. A second sleeve 44, fixed to the T-shaped plate 42, is provided between the sleeves 43. Sleeves 43 and 44 are concentrically arranged and have a press-fit open-type pin 45 inserted through them. The third U-shaped plate 41 is connected to the flip-up guardrail 12, and the T-shaped plate 42 is connected to the hollow-out support plate 2. The press-fit open-type pin 45 is inserted into the inner holes of sleeves 43 and 44. Sleeve 43 is connected to the flip-up guardrail 12 via the third U-shaped plate 41, and sleeve 44 is connected to the hollow-out support plate 2 via the T-shaped plate 42. This facilitates the flip-up guardrail 12 relative to the hollow-out support plate 2, improving operational convenience.

[0039] The J-shaped rod sliding connection assembly 90 includes an inverted J-shaped rod 91. Limiting tube 92 and limiting tube 93 are respectively fitted onto the two sides of the J-shaped rod 91. A plastic handle 94 is threaded onto one end of the J-shaped rod 91. When the J-shaped rod 91 is simultaneously inserted into the inner holes of both limiting tube 92 and limiting tube 93, a detachable connection can be achieved between adjacent flip-type railings 12, or between a fixed railing 11 and a corresponding flip-type railing 12. When one side of the J-shaped rod 91 is removed from the interior of the limiting tube 92, the adjacent flip-type railings 12 can be easily disassembled, or the fixed railing 11 and the corresponding flip-type railing 12 can be easily disassembled. The overall structure is simple and easy to operate.

[0040] Below the flip-up panel 12, there are telescopic horizontal support frames 50. The telescopic horizontal support frames 50 are connected to the electric trolley base frame 1 and are suitable for supporting the flip-up panel 12 in a horizontal state.

[0041] The telescopic horizontal support frame 50 includes a transverse tube 51 and longitudinal tubes 52 connected to the lower planes at both ends of the transverse tube 51. A fixed tube body 53 is slidably connected to the outer side of the longitudinal tube 52. The fixed tube body 53 is connected to the perforated support plate 2. An end plate 54 is connected to the end of the longitudinal tube 52 away from the transverse tube 51, which is suitable for preventing the longitudinal tube 52 from detaching from the inner hole of the fixed tube body 53. In use, the transverse tube 51 is pulled outward a certain distance, and the transverse tube 51 drives the longitudinal tube 52 to slide within the fixed tube body 53. The transverse tube 51 abuts against the corresponding flip-up side panel 12, so that the flip-up side panel 12 is in a horizontal state, which facilitates the placement of goods on the flip-up side panel 12 and expands the carrying area of ​​the small transport vehicle.

[0042] It also includes a falling self-locking mechanism, which is suitable for preventing the hollowed-out support plate 2 from flipping and separating relative to the electric trolley base 1.

[0043] The drop-type self-locking mechanism includes a telescopic hand lever assembly 60, a hinged spring-loaded grip 70, and a U-shaped bar assembly 80. The hinged spring-loaded grip 70 includes a slot 71 that can engage with the U-shaped bar assembly 80. Both the telescopic hand lever assembly 60 and the U-shaped bar assembly 80 are connected to the electric trolley frame 1, and the hinged spring-loaded grip 70 is connected to the telescopic hand lever assembly 60. During the process of the hollowed-out support plate 2 being pulled back to its original position, it will cause the telescopic hand lever assembly 60 to swing synchronously. The telescopic hand lever assembly 60 will then cause the hinged spring-loaded grip 70 to swing. When the hinged spring-loaded grip 70 contacts the U-shaped rod assembly 80, it will be squeezed, causing the slot 71 to move accordingly. When the slot 71 aligns with the U-shaped rod assembly 80, under the action of the rebound force of the hinged spring-loaded grip 70, the slot 71 will lock onto the telescopic hand lever assembly 60, thereby preventing the telescopic hand lever assembly 60 from separating from the U-shaped rod assembly 80, and finally achieving a locking effect. When the telescopic hand lever assembly 60 is gripped tightly by hand and its rebound force is overcome, the slot 71 can be driven to separate from the U-shaped rod assembly 80, thereby causing the hollowed-out support plate 2 to flip to an inclined state, thus achieving the purpose of detachably connecting the hollowed-out support plate 2 and the electric trolley frame 1.

[0044] The telescopic handheld lever assembly 60 includes a rectangular plate 61, a cylindrical tube 62 connected to the rectangular plate 61, and a handheld lever 63 slidably connected to the inner hole of the cylindrical tube 62. The rectangular plate 61 is connected to the bottom of the perforated support plate 2. A nut is connected to the outer circle of the cylindrical tube 62, and a handle 64 is threaded onto the nut. One end of the handle 64 passes through the wall of the cylindrical tube 62 and is tightly connected to the handheld lever 63. A spring 65 is sleeved on the outer circle of the screw of the handle 64. After pulling the handheld lever 63 outward for axial sliding, rotating the handle 64 fixes the handheld lever 63 to the cylindrical tube 62. Gripping the handheld lever 63 and lifting it can drive the perforated support plate 2 to flip to an inclined state, increasing the distance between the force point and the pin-type hinge assembly 30, increasing the torque, and having a labor-saving effect. Next, rotating the handle 64 in the opposite direction pushes the handheld lever 63 in the opposite direction to prevent the user from colliding with the handheld lever 63 during walking. The use of the spring 65 prevents the handle 64 from becoming loose.

[0045] The hinged spring-loaded grip 70 includes a U-shaped base 72, a cylinder 78, and a grip rod 73. The grip rod 73 has a slot 71. The U-shaped base 72 is connected to the telescopic hand handle assembly 60. It also includes a round rod 74 passing through the U-shaped base 72 and a torsion spring 75 with one end radially passing through the cylinder 78. One end of the grip rod 73 extends into the U-shaped base 72 and is fixedly connected to the round rod 74. The torsion spring 75 is sleeved on the outer circles of both ends of the round rod 74. A limiting shaft 76 passes through the U-shaped base 72. The other end of the torsion spring 75 abuts against the outer circle of the limiting shaft 76. The U-shaped base 72 has a groove 77, and the cylinder 78 is located in the groove 77. Under the combined action of tension and the gravity of the hollowed-out support plate 2, the fixed guardrail 11, and the flip-up guardrail 12, the torsion of the torsion spring 75 is overcome, so that the slot 71 and the U-shaped rod assembly 80 are precisely aligned. Subsequently, the slot 71 engages with the U-shaped rod assembly 80, achieving structural locking. By gripping the handle rod 73 and overcoming the torque of the torsion spring 75, the slot 71 can be separated from the U-shaped rod assembly 80. At this point, the hollowed-out support plate 2 can be freely flipped, completing the unlocking operation.

[0046] The U-shaped rod assembly 80 includes a U-shaped fixing seat 81 and a U-shaped rod body 82. Both ends of the U-shaped rod body 82 are connected to the U-shaped fixing seat 81, and the U-shaped rod body 82 is engaged in the slot 71. The U-shaped fixing seat 81 is connected to the electric trolley base frame 1. The U-shaped rod body 82 is engaged in the slot 71 to achieve the purpose of locking, and the U-shaped rod body 82 is separated from the slot 71 to achieve the operation of unlocking.

[0047] The implementation principle of this embodiment is as follows: During use, goods are transported onto the perforated support plate 2, and then the flip-up railing 12 is swung to a vertical position. The J-shaped rod sliding connection assembly 90 is used to detachably connect adjacent flip-up railings 12. Both ends of the fixed railing 11 are detachably connected to the corresponding flip-up railing 12 via the J-shaped rod sliding connection assembly 90. The use of the fixed railing 11 and the flip-up railing 12 prevents goods from sliding off the perforated support plate 2. When unloading is required, since one end of the perforated support plate 2 is connected to the electric trolley frame 1 via a pin-type hinge assembly 30, forcefully driving the perforated support plate 2 causes it to swing at a certain angle, tilting the goods downwards along the slope of the perforated support plate 2, achieving rapid unloading. Next, pull the flip-up panel 12 connected to the side of the perforated support plate 2. Under the interaction of the pulling force and the weight of the perforated support plate 2, the flip-up panel 12, and the fixed panel 11, the perforated support plate 2 swings in the opposite direction and resets. Through the use of the falling self-locking mechanism, the perforated support plate 2 and the electric trolley base frame 1 are connected in a snap-fit ​​manner, achieving the purpose of locking. The user does not need to operate the pin structure to connect the perforated support plate 2 and the electric trolley base frame 1, which improves the convenience of operation. When it is necessary to transport large and light goods, operate the telescopic horizontal support frame 50 to unfold it. Next, operate the flip-up panel 12 to flip outward and connect it to the telescopic horizontal support frame 50. The flip-up panel 12 is in a horizontal state and can be used as a bearing surface. That is, the goods can be placed on the perforated support plate 2 and the flip-up panel 12, which expands the bearing area, increases the number of goods transported at one time, and improves the transportation efficiency.

[0048] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A compact transport vehicle for ease of use, comprising: An electric trolley chassis (1) with a rolling function is provided with a hollowed-out support plate (2) on the upper surface of the electric trolley chassis (1). One end of the hollowed-out support plate (2) is connected to the electric trolley chassis (1) by at least two pin-type hinge components (30). The hollowed-out support plate (2) is characterized in that a fixed guardrail (11) is connected to one side of the hollowed-out support plate (2) in the width direction, and a flip-type guardrail (12) is provided on the other three sides of the hollowed-out support plate (2). At least two pin-type hinge components (40) are connected to the flip-type guardrail (12) and the electric trolley chassis (1). A J-shaped rod sliding connection component (90) is connected between adjacent flip-type guardrails (12). The two ends of the fixed guardrail (11) are connected to the corresponding flip-type guardrail (12) by the J-shaped rod sliding connection component (90). Below the flip-type railing (12) are telescopic horizontal support frames (50), which are connected to the electric trolley base frame (1) and are suitable for supporting the flip-type railing (12) in a horizontal state. It also includes a drop-type self-locking mechanism, which is suitable for preventing the hollowed-out support plate (2) from flipping and separating relative to the electric trolley frame (1).

2. The compact transport vehicle of claim 1, wherein, The drop-type self-locking mechanism includes a telescopic hand lever assembly (60), a hinged spring-loaded grip (70), and a U-shaped rod assembly (80). The hinged spring-loaded grip (70) includes a slot (71) that can engage with the U-shaped rod assembly (80). Both the telescopic hand lever assembly (60) and the U-shaped rod assembly (80) are connected to the electric trolley frame (1). The hinged spring-loaded grip (70) is connected to the telescopic hand lever assembly (60).

3. The compact transport vehicle of claim 2, wherein, The telescopic handheld rod assembly (60) includes a rectangular plate (61), a cylindrical tube (62) connected to the rectangular plate (61), and a handheld rod (63) slidably connected to the inner hole of the cylindrical tube (62). The rectangular plate (61) is connected to the bottom of the hollowed-out support plate (2). A nut is connected to the outer circle of the cylindrical tube (62), and a handle (64) is connected to the inner thread of the nut. One end of the handle (64) passes through the tube wall of the cylindrical tube (62) and is tightly connected to the handheld rod (63). A spring (65) is sleeved on the outer circle of the screw of the handle (64).

4. The compact transport vehicle of claim 2, wherein, The hinged spring-loaded grip (70) includes a U-shaped base (72), a cylinder (78), and a grip rod (73). The grip rod (73) is provided with the slot (71). The U-shaped base (72) is connected to the telescopic hand handle assembly (60). It also includes a round rod (74) passing through the U-shaped base (72) and a torsion spring (75) with one end radially passing through the cylinder (78). One end of the grip rod (73) extends into the U-shaped base (72) and is fixedly connected to the round rod (74). The torsion spring (75) is sleeved on the outer circles of both ends of the round rod (74). A limiting shaft (76) passes through the U-shaped base (72). The other end of the torsion spring (75) abuts against the outer circle of the limiting shaft (76). The U-shaped base (72) is provided with a groove (77). The cylinder (78) is located in the groove (77).

5. The compact transport vehicle of claim 2, wherein, The U-shaped rod assembly (80) includes a U-shaped fixing seat (81) and a U-shaped rod body (82). Both ends of the U-shaped rod body (82) are connected to the U-shaped fixing seat (81). The U-shaped rod body (82) is engaged in the slot (71). The U-shaped fixing seat (81) is connected to the electric trolley chassis (1).

6. The compact transport vehicle of claim 1, wherein, The telescopic horizontal support frame (50) includes a transverse tube (51) and longitudinal tubes (52) connected to the lower planes at both ends of the transverse tube (52). A fixed tube body (53) is slidably connected to the outer side of the longitudinal tube (52). The fixed tube body (53) is connected to the hollow bearing plate (2). An end plate (54) is connected to the end of the longitudinal tube (52) away from the transverse tube (51), which is suitable for preventing the longitudinal tube (52) from detaching from the inner hole of the fixed tube body (53).

7. The compact transport vehicle of claim 1, wherein, The pin-type hinge assembly (30) includes a first U-shaped plate (31) and connecting plates (32) disposed on both sides thereof. The first U-shaped plate (31) and the connecting plates (32) are connected by a pin shaft. The first U-shaped plate (31) is connected to the hollowed-out bearing plate (2). The connecting plates (32) are connected to the electric trolley chassis (1).

8. The compact transport vehicle of claim 1, wherein, The second pin-type hinge assembly (40) includes a third U-shaped plate (41) and a T-shaped plate (42). The two ends of the third U-shaped plate (41) are respectively connected to a first sleeve (43). A second sleeve (44) is fixed on the T-shaped plate (42) between the first sleeve (43). The first sleeve (43) and the second sleeve (44) are concentrically arranged and are provided with a squeeze-opening pin (45). The third U-shaped plate (41) is connected to the flip-up guardrail (12), and the T-shaped plate (42) is connected to the hollowed-out support plate (2).

9. The compact transport vehicle of claim 1, wherein, The J-shaped rod sliding connection assembly (90) includes an inverted J-shaped rod (91), with limit tube one (92) and limit tube two (93) respectively fitted on the two sides of the J-shaped rod (91), and a plastic handle (94) threadedly connected to one end of the J-shaped rod (91).

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