Loading and unloading platform

Abstract

The loading and unloading platform provided by the present invention includes a load-bearing platform, a lifting device, a guardrail, a lap plate, a first and a second control circuit, and a first and a second driving mechanism. By arranging a first contact assembly in series on the first control circuit at the bottom of the load-bearing platform, the first contact assembly can be connected only when the lap plate rotates to a folded working state, thereby connecting the first control circuit, that is, only when the lap plate rotates to the folded working state, the first control circuit can control the lifting device to move and lift the load-bearing platform; by arranging a second contact assembly in series on the second control circuit at the bottom of the load-bearing platform, the second contact assembly can be connected only when the guardrail is dropped to a lower working state, thereby connecting the second control circuit, that is, only when the guardrail is dropped to a lower working state, the second control circuit can control the second driving mechanism to move and rotate the lap plate; the action control has high efficiency and good reliability, simple control structure and low cost.

Description

Technical Field

[0001] The invention relates to the field of lifting machinery, and in particular to a loading and unloading platform. Background Art

[0002] A loading and unloading platform refers to a liftable mechanical device that can help users load and unload trucks of various heights and sizes safely and efficiently. When raised, the load-bearing platform of the loading and unloading platform is overlapped on the rear of the truck, allowing a forklift to enter the truck from the load-bearing platform to load and unload goods. When lowered, the load-bearing platform of the loading and unloading platform retracts into the pit to make the ground level.

[0003] To facilitate the overlapping of the load-bearing platform, a rotatable overlapping plate is often provided on the side of the load-bearing platform. To improve the safety of the transport forklift on the load-bearing platform, a liftable guardrail is often provided on both sides of the load-bearing platform. When in use, the lifting and lowering action of the load-bearing platform, the rotating action of the overlapping plate, and the lifting and lowering action of the guardrail need to be performed step by step to avoid unsafe phenomena such as the overlapping plate hitting the edge of the pit or the transport forklift falling from the load-bearing platform. The motion control of the existing loading and unloading platform usually adopts the manual operation method after manual observation. This method is inefficient, prone to misoperation, and has poor reliability. If program control devices such as PLC and sensors are purchased for control, the requirements of automatic control can be met, but the circuit design of the entire loading and unloading platform is complicated and the cost is high. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a loading and unloading platform with high motion control efficiency, good reliability, simple control structure and low cost.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is that the loading and unloading platform comprises:

[0006] A bearing platform, the bearing platform is arranged in the pit in a liftable manner, and the projection of the bearing platform in the vertical direction is a rectangle;

[0007] A lifting device, the lifting device is used to drive the carrying platform to rise and fall, and the lifting device is an electric lifting device;

[0008] A first control circuit, wherein the first control circuit is used to control the action of the lifting device;

[0009] A guardrail, the guardrail is a frame structure, the guardrail is escalably arranged on the long side of the carrying platform, the guardrail has an upper working state and a lower working state, when the guardrail is in the upper working state, the upper part of the guardrail protrudes from the upper surface of the carrying platform to protect the long side of the carrying platform, when the guardrail is in the lower working state, the upper end surface of the guardrail is flush with the upper surface of the carrying platform;

[0010] A first driving mechanism, the first driving mechanism is used to drive the guardrail to rise and fall;

[0011] A lap plate, the lap plate is rotatably arranged on the short side of the load-bearing platform, the lap plate has an extended working state and a folded working state, when the lap plate is in the extended working state, the upper surface of the lap plate is flush with the upper surface of the load-bearing platform, when the lap plate is in the folded working state, the plane where the lap plate is located is perpendicular to the upper surface of the load-bearing platform;

[0012] A second driving mechanism, the second driving mechanism is used to drive the overlap plate to rotate so that it can be changed to the expanded working state or the folded working state;

[0013] A second control circuit, the second control circuit is used to control the action of the second driving mechanism;

[0014] A first contact assembly is provided at the bottom of the short side of the carrier platform, and the first contact assembly is connected in series to the first control circuit. When the lap plate rotates to a folded working state, the lap plate connects the first contact assembly to connect the first control circuit.

[0015] A second contact assembly is provided at the bottom of the long side of the support platform, and the second contact assembly is connected in series to the second control circuit. When the guardrail descends to the lower working state, the guardrail connects the second contact assembly to turn on the second control circuit.

[0016] Preferably, a downwardly extending mounting plate is provided on the short side of the supporting platform, and the mounting plate is an insulating plate. The first contact assembly includes a first contact and a second contact arranged at the upper end of the mounting plate. When the lap plate is rotated to a retracted working state, the upper end of the lap plate contacts the first contact, and the lower end of the lap plate contacts the second contact, so that the first contact assembly is connected.

[0017] Further preferably, a first connecting bar is provided on the lap board, the first connecting bar is a copper bar, the first connecting bar is insulated from the lap board, and when the lap board is rotated to a folded working state, the first connecting bar is located on the inner side of the lap board and connects the first contact and the second contact.

[0018] Preferably, a mounting seat protruding outward is provided on the long side of the supporting platform, and the mounting seat is insulated from the supporting platform. The second contact assembly includes a third contact arranged at the left end of the mounting seat and a fourth contact arranged at the right end of the mounting seat. When the guardrail descends to the lower working state, the top crossbeam of the guardrail contacts the third contact and the fourth contact, so that the second contact assembly is connected.

[0019] Further preferably, a second connecting bar is provided on the lower end surface of the top cross beam, the second connecting bar is a copper bar, and the second connecting bar is provided to be insulated from the top cross beam.

[0020] Further preferably, the mounting seat is made of an insulating material, and a metal rod that can slide up and down is provided on the mounting seat, and annular flanges are provided at both ends of the metal rod. The metal rod includes a first metal rod located at the left end of the mounting seat and a second metal rod located at the right end of the mounting seat, the annular flange at the lower end of the first metal rod constitutes the third contact, and the annular flange at the upper end of the second metal rod constitutes the fourth contact.

[0021] Further preferably, a spring for driving the metal rod to move upward is also provided on the mounting seat, and the spring includes a first spring and a second spring, the first spring is sleeved on the first metal rod, the lower end of the first spring is pressed against the top of the mounting seat, and the upper end of the first spring is pressed against the third contact, the second spring is sleeved on the second metal rod, the lower end of the second spring is pressed against the top of the mounting seat, and the upper end of the second spring is pressed against the fourth contact.

[0022] Preferably, the first driving mechanism includes a first hydraulic cylinder, the cylinder body of the first hydraulic cylinder is arranged on a connecting seat extending downward on the long side of the supporting platform, the connecting seat is located in the middle position of the long side of the supporting platform, and the lifting rod of the first hydraulic cylinder is connected to the middle position of the top crossbeam of the guardrail.

[0023] Preferably, the loading and unloading platform also includes a guiding device for guiding the lifting and lowering of the guardrail, the guiding device includes a linear guide rail and a linear slider arranged on the guardrail, the linear guide rail is arranged in a vertical direction, the two ends of the linear guide rail are respectively fixed on the top beam and the bottom beam of the guardrail, and the linear slider is fixed on the side wall of the long side of the load-bearing platform.

[0024] Preferably, the second driving mechanism comprises a second hydraulic cylinder, a cylinder body of the second hydraulic cylinder is rotatably connected to the bottom of the supporting platform, and an end of a lifting rod of the second hydraulic cylinder is rotatably connected to the lap plate.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] The loading and unloading platform provided by the present invention includes a load-bearing platform, a lifting device, a guardrail, a lap plate, a first and a second control circuit, and a first and a second driving mechanism. By arranging a first contact assembly in series on the first control circuit at the bottom of the load-bearing platform, the first contact assembly can be connected only when the lap plate rotates to a folded working state, thereby connecting the first control circuit, that is, only when the lap plate rotates to the folded working state, the first control circuit can control the lifting device to move and lift the load-bearing platform; by arranging a second contact assembly in series on the second control circuit at the bottom of the load-bearing platform, the second contact assembly can be connected only when the guardrail is dropped to a lower working state, thereby connecting the second control circuit, that is, only when the guardrail is dropped to a lower working state, the second control circuit can control the second driving mechanism to move and rotate the lap plate; the action control has high efficiency and good reliability, simple control structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main view in the preferred embodiment of the present invention. At this time, the bearing platform is not raised, the lap plate is in a retracted working state, and the guardrail is in a lower working state.

[0028] Figure 2 It is a schematic diagram of the main view in the preferred embodiment of the present invention. At this time, the bearing platform has been raised, the lap plate is in a retracted working state, and the guardrail is in a lowered working state.

[0029] Figure 3 It is a schematic diagram of the main view in the preferred embodiment of the present invention. At this time, the bearing platform has been raised, the lap plate is in the unfolded working state, and the guardrail is in the upper working state.

[0030] Figure 4 yes Figure 2 A partial enlarged view of point A in the middle.

[0031] Figure 5 yes Figure 2 The front view of the second driving mechanism in the figure shows that the lap plate is in a retracted working state.

[0032] Figure 6 yes Figure 2 Schematic diagram of the front view of the second driving mechanism in the figure, at this time, the lap plate is in the expanded working state.

[0033] in:

[0034] 10. Carrying platform; 11. Mounting plate; 12. Mounting seat; 121. First metal rod; 122. Second metal rod; 123. Annular flange; 124. First spring; 125. Second spring; 20. Lifting device; 30. Guardrail; 31. Top beam; 311. Insulating plate; 312. Second connecting strip; 32. Bottom beam; 40. First hydraulic cylinder; 41. Cylinder body; 42. Lifting rod; 50. Lap plate; 51. Insulating plate; 52. First connecting strip; 60. Second hydraulic cylinder; 61. Cylinder body; 62. Lifting rod; 70. First contact assembly; 71. First contact; 72. Second contact; 80. Second contact assembly; 81. Third contact; 82. Fourth contact; 90. Guide device; 91. Linear guide rail; 92. Linear slider. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0036] The up and down directions described in the present invention refer to Figure 2 The up-down direction in the present invention refers to the left-right direction. Figure 2 The left and right direction in .

[0037] like Figure 1-3 As shown, the loading and unloading platform provided by the present invention includes: a load-bearing platform 10, a lifting device 20, a first control circuit, a guardrail 30, a first driving mechanism, a lap plate 40, a second driving mechanism, a second control circuit, a first contact assembly 70, a second contact assembly 80 and a guide device 90.

[0038] The supporting platform 10 is liftably disposed in the pit, and the projection of the supporting platform 10 in the vertical direction is a rectangle.

[0039] The lifting device 20 is used to drive the load-bearing platform 10 to rise and fall. The lifting device 20 is an electric lifting device. The lifting device 20 includes a support frame, a hydraulic cylinder, an oil pump, an oil pump motor and other components. The specific connection relationship and position relationship thereof are prior art and will not be repeated here.

[0040] The first control circuit is a control circuit of the oil pump motor of the lifting device 20, and the first control circuit is used to control the action of the lifting device.

[0041] The guardrail 30 is a frame structure. The guardrail 30 can be raised and lowered and is arranged on the long side of the load-bearing platform 10. The guardrail 30 has an upper working state and a lower working state. When the guardrail 30 is in the upper working state, the upper part of the guardrail 30 protrudes from the upper surface of the load-bearing platform 10 to protect the long side of the load-bearing platform 10. When the guardrail 30 is in the lower working state, the upper end surface of the guardrail 30 is flush with the upper surface of the load-bearing platform 10.

[0042] The first driving mechanism is used to drive the guardrail 30 to rise and fall. The first driving mechanism includes a first hydraulic cylinder 40. The cylinder body 41 of the first hydraulic cylinder 40 is arranged on a connecting seat 13 extending downward on the long side of the supporting platform 10. The connecting seat 13 is located in the middle position of the long side of the supporting platform 10. The lifting rod 42 of the first hydraulic cylinder 40 is connected to the middle position of the top cross beam 31 of the guardrail 30.

[0043] The lap plate 50 is rotatably arranged on the short side of the supporting platform 10. The lap plate 50 has an extended working state and a folded working state. When the lap plate 50 is in the extended working state, the upper surface of the lap plate 50 is flush with the upper surface of the supporting platform 10. When the lap plate 50 is in the folded working state, the plane where the lap plate 50 is located is perpendicular to the upper surface of the supporting platform 10.

[0044] The second driving mechanism is used to drive the lap plate 50 to rotate so that the lap plate 50 can be transformed to the expanded working state or the folded working state. The second driving mechanism includes a second hydraulic cylinder 60, an oil pump and an oil pump motor used in conjunction with the second hydraulic cylinder 60. The cylinder body 61 of the second hydraulic cylinder 60 is rotatably connected to the bottom of the supporting platform 10, and the end of the lifting rod 62 of the second hydraulic cylinder 60 is rotatably connected to the lap plate 50.

[0045] The second control circuit is a control circuit of the oil pump motor of the second hydraulic cylinder 60 , and the second control circuit is used to control the action of the second hydraulic cylinder 60 .

[0046] The first contact assembly 70 is arranged at the bottom of the short side of the supporting platform 10, and the first contact assembly 70 is connected in series to the above-mentioned first control circuit. When the connecting plate 50 rotates to the folded working state, the connecting plate 50 connects to the first contact assembly 70, so that the above-mentioned first control circuit is turned on, so that the supporting platform 10 can be lifted and lowered under the drive of the lifting device 20.

[0047] The second contact assembly 80 is arranged at the bottom of the long side of the supporting platform 10, and the second contact assembly 80 is connected in series to the above-mentioned second control circuit. When the guardrail 30 descends to the lower working state, the top crossbeam 31 of the guardrail 30 connects to the second contact assembly 80, so that the above-mentioned second control circuit is turned on, so that the lap plate 50 can be transformed from the extended working state to the retracted working state under the drive of the second hydraulic cylinder 60.

[0048] To facilitate installation and improve connectivity between the jumper plate 50 and the first contact assembly 70 when in the folded working state, a downwardly extending mounting plate 11 is provided on the short side of the carrier 10, and the mounting plate 11 is an insulating plate. The first contact assembly 70 includes a first contact 71 and a second contact 72 arranged at the upper end of the mounting plate 11, and a first connecting strip 52 is provided on the jumper plate 50. The first connecting strip 52 is a copper strip, and the first connecting strip 52 is connected to the jumper plate 50 through the insulating plate 51, so that the first connecting strip 52 is insulated from the jumper plate 50. When the jumper plate 50 rotates to the folded working state, the first connecting strip 52 is located on the inner side of the jumper plate 50, and the upper end of the first connecting strip 52 contacts with the first contact 71, and the lower end of the first connecting strip 52 contacts with the second contact 72, thereby connecting the first contact 71 and the second contact 72, so that the first contact assembly 70 is turned on.

[0049] In order to facilitate installation and improve the connectivity between the guardrail 30 and the second contact assembly 80 when the guardrail 30 is in the lower working state, a mounting seat 12 protruding outward is provided on the long side of the carrier 10. The mounting seat 12 is made of an insulating material so that the mounting seat 12 is insulated from the carrier 10. A metal rod that can slide up and down is provided on the mounting seat 12. An annular flange 123 is provided at both ends of the metal rod. The metal rod includes a first metal rod 121 located at the left end of the mounting seat 12 and a second metal rod 122 located at the right end of the mounting seat 12. The annular flange 123 at the lower end of the first metal rod 121 constitutes The third contact 81 and the annular flange 123 at the upper end of the second metal rod 122 constitute the fourth contact 82. A second connecting strip 312 is provided on the top cross beam 31 of the guardrail 30. The second connecting strip 312 is a copper strip. The second connecting strip 312 is provided on the lower end surface of the top cross beam 31 through an insulating plate 311, so that the second connecting strip 312 is insulated from the top cross beam 31. When the guardrail 30 descends to the lower working state, the second connecting strip 312 on the top cross beam 31 of the guardrail 30 contacts the third contact 81 and the fourth contact 82, so that the second contact assembly 80 is connected.

[0050] Since the action of the hydraulic cylinder has a certain hysteresis, in order to prevent the guardrail 30 from crushing the second contact assembly 80 and to enable the second contact assembly 80 to better fit the second connecting strip 312, a spring for driving the metal rod to move upward is also provided on the mounting seat 12, and the spring includes a first spring 124 and a second spring 125. The first spring 124 is sleeved on the first metal rod 121, and the lower end of the first spring 124 is pressed against the top of the mounting seat 12, and the upper end of the first spring 124 is pressed against the third contact 81. The second spring 125 is sleeved on the second metal rod 122, and the lower end of the second spring 125 is pressed against the top of the mounting seat 12, and the upper end of the second spring 125 is pressed against the fourth contact 82.

[0051] The guiding device 90 includes a linear guide rail 91 and a linear slider 92 arranged on the guardrail 30. The linear guide rail 91 is arranged in the vertical direction. The two ends of the linear guide rail 91 are respectively fixed on the top beam 31 and the bottom beam 32 of the guardrail 30. The linear guide rail 91 plays a guiding role and also plays a role in supporting the top beam 31 and the bottom beam 32. The linear slider 92 is fixed on the side wall of the long side of the load-bearing platform 10.

[0052] It should be noted that most oil pump motors use a low-voltage circuit to control the operation of a high-voltage main circuit. The control circuit is a low-voltage circuit that is lower than the safety voltage, and connecting the contact assembly in series to the control circuit is not dangerous.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. Loading and unloading platform, including: A bearing platform, the bearing platform is arranged in the pit in a liftable manner, and the projection of the bearing platform in the vertical direction is a rectangle; A lifting device, the lifting device is used to drive the carrying platform to rise and fall, and the lifting device is an electric lifting device; A first control circuit, wherein the first control circuit is used to control the action of the lifting device; A guardrail, the guardrail is a frame structure, the guardrail is escalably arranged on the long side of the carrying platform, the guardrail has an upper working state and a lower working state, when the guardrail is in the upper working state, the upper part of the guardrail protrudes from the upper surface of the carrying platform to protect the long side of the carrying platform, when the guardrail is in the lower working state, the upper end surface of the guardrail is flush with the upper surface of the carrying platform; A first driving mechanism, the first driving mechanism is used to drive the guardrail to rise and fall; A lap plate, the lap plate is rotatably arranged on the short side of the load-bearing platform, the lap plate has an extended working state and a folded working state, when the lap plate is in the extended working state, the upper surface of the lap plate is flush with the upper surface of the load-bearing platform, when the lap plate is in the folded working state, the plane where the lap plate is located is perpendicular to the upper surface of the load-bearing platform; A second driving mechanism, the second driving mechanism is used to drive the overlapping plate to rotate so that it can be changed to the extended working state or the folded working state; a second control circuit, the second control circuit being used to control the action of the second driving mechanism; Features: A first contact assembly is provided at the bottom of the short side of the carrier platform, and the first contact assembly is connected in series to the first control circuit. When the lap plate rotates to a folded working state, the lap plate connects the first contact assembly to connect the first control circuit. A second contact assembly is provided at the bottom of the long side of the carrying platform, and the second contact assembly is connected in series to the second control circuit. When the guardrail is lowered to the lower working state, the guardrail connects the second contact assembly to turn on the second control circuit. A mounting plate extending downward is provided on the short side of the carrier, the mounting plate is an insulating plate, the first contact assembly includes a first contact and a second contact arranged at the upper end of the mounting plate, when the lap plate rotates to a retracted working state, the upper end of the lap plate contacts the first contact, and the lower end of the lap plate contacts the second contact, so that the first contact assembly is connected; The lap board is provided with a first connecting bar, the first connecting bar is a copper bar, the first connecting bar is insulated from the lap board, and when the lap board is rotated to a folded working state, the first connecting bar is located on the inner side of the lap board and connects the first contact and the second contact; A mounting seat protruding outward is provided on the long side of the carrying platform, and the mounting seat is insulated from the carrying platform. The second contact assembly includes a third contact arranged at the left end of the mounting seat and a fourth contact arranged at the right end of the mounting seat. When the guardrail is lowered to the lower working state, the top crossbeam of the guardrail contacts the third contact and the fourth contact, so that the second contact assembly is connected; The mounting seat is made of an insulating material, and a metal rod that can slide up and down is arranged on the mounting seat, and an annular flange is arranged at both ends of the metal rod, and the metal rod includes a first metal rod located at the left end of the mounting seat and a second metal rod located at the right end of the mounting seat, and the annular flange at the upper end of the first metal rod constitutes the third contact, and the annular flange at the upper end of the second metal rod constitutes the fourth contact; The mounting seat is also provided with a spring for driving the metal rod to move upward, and the spring includes a first spring and a second spring, the first spring is sleeved on the first metal rod, the lower end of the first spring is pressed against the top of the mounting seat, and the upper end of the first spring is pressed against the third contact, the second spring is sleeved on the second metal rod, the lower end of the second spring is pressed against the top of the mounting seat, and the upper end of the second spring is pressed against the fourth contact.

2. The loading and unloading platform according to claim 1, characterized in that: A second connecting bar is arranged on the lower end surface of the top cross beam, the second connecting bar is a copper bar, and the second connecting bar is arranged to be insulated from the top cross beam.

3. The loading and unloading platform according to claim 1, characterized in that: The first driving mechanism includes a first hydraulic cylinder, the cylinder body of the first hydraulic cylinder is arranged on a connecting seat extending downward on the long side of the supporting platform, the connecting seat is located in the middle position of the long side of the supporting platform, and the lifting rod of the first hydraulic cylinder is connected to the middle position of the top crossbeam of the guardrail.

4. The loading and unloading platform according to claim 1, characterized in that: The loading and unloading platform also includes a guide device for guiding the lifting and lowering of the guardrail, the guide device includes a linear guide rail and a linear slider arranged on the guardrail, the linear guide rail is arranged in a vertical direction, the two ends of the linear guide rail are respectively fixed on the top beam and the bottom beam of the guardrail, and the linear slider is fixed on the side wall on the long side of the load-bearing platform.

5. The loading and unloading platform according to claim 1, characterized in that: The second driving mechanism comprises a second hydraulic cylinder, a cylinder body of the second hydraulic cylinder is rotatably connected to the bottom of the bearing platform, and an end of a lifting rod of the second hydraulic cylinder is rotatably connected to the lap plate.

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