A safety protection device for a variable attitude printing test platform

Abstract

The present invention discloses a safety protection device for a variable attitude printing test platform, which includes a platform base, a platform flipping module and a motion protection module; the platform flipping module includes a driving mechanism and a ferromagnetic plate, and the ferromagnetic plate is rotationally fixed to the platform base through an optical axis provided on the back; the output end of the driving mechanism is connected to one end of the optical axis; the motion protection module includes a protection ring provided on the front of the ferromagnetic plate for accommodating a ferromagnetic printing device, and four groups of thin rotating shafts and four rotating synchronous belt pulleys are evenly and alternately arranged on the outer side of the protection ring; four equal-length sliding grooves are provided on the front of the ferromagnetic plate near the four sides, and a support sliding seat is provided in each sliding groove; the four groups of thin rotating shafts, the four rotating synchronous belt pulleys and the four support sliding seats are sequentially connected in series through a synchronous belt to form a closed loop. By using the present invention, the safety and stability of the moving mechanism at various inclination angles can be ensured, especially preventing the device from slipping during high-inclination operation.

Description

Technical Field

[0001] The present invention relates to the field of printing devices, and particularly to a safety protection device for a variable attitude printing test platform. Background Art

[0002] For a moving robot or trolley equipped with an additive and subtractive device, when performing maintenance tasks on equipment such as ships and large storage tanks, complex working conditions with large inclinations are often encountered. In such an environment, it is difficult to comprehensively simulate the real working conditions only by relying on computer modeling and simulation or conducting motion tests based on a self-built physical platform. In addition, the self-built platform usually lacks effective protection and automatic flipping functions, making it difficult to ensure the safety and stability of the equipment.

[0003] For example, the Chinese patent document with the publication number CN113181664A discloses a rotatable multi-degree-of-freedom motion platform, which includes a lifting support unit and a mounting platform. The lifting support unit includes at least two lifting units and a support unit, or at least three lifting units. The lifting unit includes a first motor drive assembly, a chain drive assembly, a sliding assembly, a lifting assembly, and a universal joint. The chain drive assembly includes a driving gear, a driven gear, a traction chain, and a gear mounting seat. The sliding assembly includes at least two support seats, a sliding track supported between at least two support seats, a first slider assembly and a second slider assembly sliding on the sliding track. The lifting assembly includes a first support frame and a second support frame in an "H" shape. The support unit includes a universal joint and a column hinged to the base.

[0004] The Chinese patent document with the publication number CN105690376A discloses a multi-degree-of-freedom motion platform, which includes a base, connecting rods, and a top plate; there are at least 3 groups of connecting rods, and every two are in a group; the upper end of each connecting rod is rotationally connected to the top plate through an upper connecting member, and the lower ends of the two connecting rods in the same group are both rotationally connected to the same power transmission device through a lower connecting member. The power transmission device is installed on the base, and at least one motor is connected to one power transmission device; there are at least 3 power transmission devices, and one power transmission device drives the lower ends of a group of connecting rods to move linearly. The movement trajectories of the lower ends of the two connecting rods in the same group are parallel or collinear, and the movement trajectories of the lower ends of adjacent groups of connecting rods intersect.

[0005] However, the existing multi-degree-of-freedom motion platforms still have certain limitations in practical applications. For example, in large-angle working conditions, the motion mechanism lacks effective protection measures and may accidentally drop due to slipping. In addition, the existing platforms are mainly applicable to the motion simulation of small motion mechanisms, and when facing large-weight mechanisms, their torque support capabilities are limited and it is difficult to meet the motion requirements of higher loads. Summary of the Invention

[0006] To address the risk that a heavy mobile mechanism equipped with additive and subtractive manufacturing devices may experience unpredictable slippage during operation at large inclinations in magnetic working conditions such as the bottom of storage tanks and ships, which could lead to the equipment falling, the present invention provides a safety protection device for a variable-attitude printing test platform, which can ensure the safety and stability of the mobile mechanism at various inclinations, especially preventing the equipment from slipping during high-inclination operations.

[0007] A safety protection device for a variable-attitude printing test platform, comprising a platform base, a platform flipping module, and a motion protection module;

[0008] The platform flipping module includes a driving mechanism and a ferromagnetic plate. The ferromagnetic plate is rotationally fixed to the platform base through a optical axis provided on its back; the output end of the driving mechanism is connected to one end of the optical axis, and the ferromagnetic plate is controlled by the driving mechanism to achieve 0-180° rotation;

[0009] The motion protection module includes a protection ring provided on the front of the ferromagnetic plate for accommodating a ferromagnetic mobile printing device. Four groups of thin rotating shafts and four rotating synchronous pulleys are evenly and alternately arranged on the outer side of the protection ring, and each group of thin rotating shafts has two thin rotating shafts;

[0010] Four equally long sliding grooves are provided on the front of the ferromagnetic plate near the four sides, and each sliding groove is provided with a support sliding seat; the four groups of thin rotating shafts, the four rotating synchronous pulleys, and the four support sliding seats are sequentially connected in series by a synchronous belt to form a closed loop. Among them, the synchronous belt formed by connecting each group of thin rotating shafts and the corresponding support sliding seat in series is perpendicular to the sliding groove where the support sliding seat is located.

[0011] In the present invention, the platform flipping module is used to carry the ferromagnetic mobile printing device and the motion protection module, and can achieve 0-180° flipping to meet the requirements of various working angles. The platform flipping module itself is made of ferromagnetic material and undergoes special magnetization treatment, which can reliably adsorb the ferromagnetic mobile printing device (cart), thereby firmly fixing the cart on the ferromagnetic plate and preventing accidental movement during the flipping process. Four equally long sliding grooves are provided near the four sides of the ferromagnetic plate, and these sliding grooves are used to guide the movement of the motion protection module of the mobile printing device on the platform. When the cart moves within the protection ring, it will push the protection ring to move together. The movement of the protection ring is transmitted to the support sliding seat through the synchronous belt, and then drives the support sliding seat to move within the sliding groove of the ferromagnetic plate, realizing the free and stable positioning and movement of the cart on the ferromagnetic plate. The motion protection module is used to provide protection during the flipping of the platform or the movement of the mobile printing device itself, preventing the cart from accidentally sliding out of the ferromagnetic plate, especially when the ferromagnetic plate is at a large inclination.

[0012] Furthermore, the driving mechanism includes a reduction motor fixed on the platform base, and the output shaft of the reduction motor is connected to one end of the optical axis through a reduction gear set.

[0013] The maximum output torque of the driving mechanism can reach more than 3000 N·M, which can provide powerful power for the flipping of the ferromagnetic plate, ensuring a smooth and reliable flipping motion even when carrying a heavy trolley.

[0014] Furthermore, both ends of the optical axis are rotationally fixed to two bearing seats provided on the platform base. One end of the optical axis is provided with a keyway and a shaft sleeve. The keyway is used to cooperate with the output end of the reduction gear set to transmit power, and the shaft sleeve is used for axially fixing the optical axis.

[0015] Furthermore, a plurality of rib plates are provided on the back of the ferromagnetic plate, and the optical axis is fixed to the back of the ferromagnetic plate through a plurality of optical axis fixing seats.

[0016] Furthermore, a synchronous pulley for cooperating with the synchronous belt is provided on the front side of the support sliding seat, and an I-shaped sliding seat for cooperating with the sliding groove is provided on the rear side. This structure can precisely cooperate with the sliding groove on the ferromagnetic plate, enabling the support sliding seat to move freely and stably within the sliding groove, thereby driving the movement of the trolley on the ferromagnetic plate.

[0017] To provide safety protection in case the trolley may slip, preferably, at least two support sliding seats are provided with a braking mechanism for braking when the speed of the synchronous belt is abnormal.

[0018] Furthermore, the braking mechanism includes a grooved thin shaft connected to the rotating shaft of the synchronous pulley and an eccentric wheel provided on the grooved thin shaft;

[0019] A through hole for accommodating the eccentric wheel is provided at the upper end of the support sliding seat. Ratchet teeth are provided on the inner side of the through hole and the outer side of the eccentric wheel. When the rotational speed of the synchronous pulley exceeds a preset threshold, the movement of the eccentric wheel triggers the ratchet teeth of the through hole and the eccentric wheel to lock, preventing the synchronous pulley from continuing to rotate.

[0020] When the trolley undergoes rapid sliding, it will drive the protective ring and the synchronous belt to move rapidly, resulting in a sharp increase in the speed of the synchronous belt. At this time, the eccentric wheel will trigger the locking of the ratchet teeth due to inertia, causing the ratchet to lock quickly, thereby immediately braking the movement of the synchronous belt.

[0021] Preferably, the braking mechanisms are arranged in pairs, including a forward braking mechanism and a reverse braking mechanism. In the two braking mechanisms, the meshing directions of the ratchet teeth are opposite, respectively used for braking the synchronous belt moving in opposite directions.

[0022] By setting two braking mechanisms with opposite directions, which are respectively used to cope with the forward or backward sliding of the trolley, it is ensured that no matter which direction the synchronous belt accelerates, it can be effectively braked. Since the synchronous belt is closely connected to the protective ring, after the synchronous belt stops moving, the protective ring cannot continue to move. Even if the trolley still has a tendency to slide, it will be restricted by the protective ring, ultimately preventing the trolley from sliding out of the platform, thereby ensuring the safety of the equipment.

[0023] Preferably, the inner side of the protective ring is a smooth wall, and the inner diameter of the protective ring is slightly larger than the size of the ferromagnetic mobile printing device, so that the ferromagnetic mobile printing device can perform a predetermined movement within the protective ring, ensuring that there is no interference when the trolley moves therein.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention is provided with a mutually cooperating driving mechanism, a ferromagnetic plate and a protective ring, and a closed-loop synchronous belt system is arranged to connect the synchronous belt pulley outside the protective ring and the synchronous belt pulley installed on the support slide. It can effectively protect the heavy trolley (ferromagnetic mobile printing device) carrying the additive and subtractive mechanism at various inclination angles. Even under the working condition of a large inclination angle exceeding 45°, it can significantly reduce the risk of accidental sliding and falling of the mobile printing device, greatly improving the safety and reliability of mobile printing or manufacturing operations under complex working conditions such as simulated storage tanks and the bottom of ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a safety protection device for a variable attitude printing test platform of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the driving mechanism in an embodiment of the present invention.

[0028] Figure 3 It is a front schematic diagram of the ferromagnetic plate in an embodiment of the present invention.

[0029] Figure 4 It is a back schematic diagram of the ferromagnetic plate in an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the forward braking mechanism in an embodiment of the present invention.

[0031] In the figure: 1. Platform base, 2. Driving mechanism, 3. Electric hoist, 4. Gantry, 5. Forward braking mechanism, 6. Mobile printing device, 7. Ferromagnetic plate, 8. Synchronous belt, 9. Protection disc mechanism, 10. Reverse braking mechanism, 11. Optical axis, 12. Rib plate, 13. Optical axis fixing seat, 14. Support sliding seat, 201. Reduction motor, 202. Driven gear, 203. Driving shaft, 204. Bush, 205. Driving gear, 206. Bearing seat, 501. Grooved thin shaft, 502. Synchronous belt pulley, 503. Eccentric wheel, 504. I-shaped sliding seat, 901. Protection ring, 902. Rotating synchronous belt pulley, 903. Thin rotating shaft. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention and do not impose any limitations on it.

[0033] As Figures 1 - 3 shown, a safety protection device for a variable attitude printing test platform includes a platform base 1, a platform flipping module and a motion protection module.

[0034] The platform flipping module includes a driving mechanism 2 and a ferromagnetic plate 7. The ferromagnetic plate 7 is rotatably fixed to the platform base 1 through an optical axis 11 provided on the back surface; the output end of the driving mechanism 2 is connected to one end of the optical axis 11, and the ferromagnetic plate 7 is controlled by the driving mechanism 2 to rotate by 0 - 180°.

[0035] The motion protection module includes a protection disc mechanism 9, a support sliding seat 14, a forward braking mechanism 5, a reverse braking mechanism 10 and a synchronous belt 8.

[0036] The protection disc mechanism 9 is composed of a hollow thin-walled protection ring 901, four groups of eight thin rotating shafts 903 and four rotating synchronous belt pulleys 902. The protection ring 901 is arranged on the front surface of the ferromagnetic plate 7 and is used to accommodate the ferromagnetic mobile printing device 6 (cart). Four groups of thin rotating shafts 903 and four rotating synchronous belt pulleys 902 are evenly and alternately arranged on the outer side of the protection ring 901, and each group of thin rotating shafts 903 is provided with two thin rotating shafts 903. The thin rotating shafts 903 and the rotating synchronous belt pulleys 902 are used for the steering and motion constraint of the synchronous belt 8.

[0037] The ferromagnetic plate 7 has a length and width of 2 m × 2 m. Through magnetic treatment, it can adsorb the ferromagnetic mobile printing device 6. Four equally long chutes are provided on the front of the ferromagnetic plate 7 near the four sides, and each chute is provided with a support sliding seat 14; four groups of thin rotating shafts 903, four rotating synchronous belt wheels 902 and four support sliding seats 14 are sequentially connected in series through a synchronous belt 8 to form a closed loop. Among them, the synchronous belt formed by connecting each group of thin rotating shafts in series with the corresponding support sliding seat 14 is perpendicular to the chute where the support sliding seat 14 is located. The thin rotating shafts 903 and the rotating synchronous belt wheels 902 are evenly distributed on the outside of the protective disc to ensure the stability and correct steering of the synchronous belt 8 during movement.

[0038] As Figure 2 shown, the drive mechanism 2 includes a reduction motor 201 fixed on the platform base 1. The driving shaft 203 of the reduction motor 201 is connected to one end of the optical axis 11 through a reduction gear set composed of a driving gear 205 and a driven gear 202.

[0039] Both ends of the optical axis 11 are rotatably fixed to two bearing seats 206 provided on the platform base 1. One end of the optical axis is provided with a keyway and a shaft sleeve 204. The keyway is used to cooperate with the output end of the reduction gear set to transmit power, and the shaft sleeve 204 is used for axially fixing the optical axis 11.

[0040] The drive mechanism 2 outputs a torque of more than 3000 N·m at most. Its output torque is transmitted to the rotating shaft of the ferromagnetic plate to drive the ferromagnetic plate to flip. Specifically, the reduction motor 201 is adjusted by a frequency converter, and the lowest speed can be reduced to less than 6 revolutions per minute, with an output torque of 1000 N·m, providing power for the flipping of the ferromagnetic plate. The reduction ratio of the reduction gear set is 3, which is used to increase the output torque of the reduction motor 201 to more than 3000 N·m and reduce the output speed to 2 revolutions per minute to achieve a low-speed and stable flip of the ferromagnetic plate.

[0041] As Figure 4 shown, at least three rib plates 12 are provided on the back of the ferromagnetic plate 7. The optical axis 11 is fixed to the back of the ferromagnetic plate 7 through at least four optical axis fixing seats 13.

[0042] In the embodiment of the present invention, at least two support sliding seats are provided with a brake structure, a braking mechanism, which is used for braking when the speed of the synchronous belt 8 is abnormal. The braking mechanisms are arranged in pairs and include a forward braking mechanism and a reverse braking mechanism. In the two braking mechanisms, the meshing directions of the ratchet racks are opposite, which are respectively used for braking the synchronous belt 8 moving in opposite directions.

[0043] As Figure 5As shown, taking the forward brake mechanism 5 as an example, the front side of the support slide 14 is provided with a synchronous pulley 502 that cooperates with the synchronous belt 8, and the rear side is provided with an I-shaped slide 504 that cooperates with the slide groove. The forward brake mechanism 5 includes a slotted thin shaft 501 connected to the rotating shaft of the synchronous pulley 502 and an eccentric wheel 503 arranged on the slotted thin shaft 501. There is a thin strip at the upper end of the slotted thin shaft 501, which plays a physical restraining role on the eccentric wheel 503.

[0044] A through hole for accommodating the eccentric wheel 503 is provided at the upper end of the support slide 14, and ratchet bars are provided on the inner side of the through hole and the outer side of the eccentric wheel 503. When the rotation speed of the synchronous pulley 502 exceeds a preset threshold, the movement of the eccentric wheel 503 triggers the through hole and the ratchet bar of the eccentric wheel 503 to lock, thereby preventing the synchronous pulley 502 from continuing to rotate.

[0045] The working process of the safety protection device of the variable posture printing test platform of this embodiment is as follows:

[0046] 1. Preparation of equipment for operation: First, the operator will safely hoist the ferromagnetic mobile printing equipment 6 (trolley) for printing or additive manufacturing, which usually carries a strong magnet, to the top of the platform flip module through the gantry 4 and the electric hoist 3. Make sure that the trolley is stably placed in the protective ring 901 on the front of the ferromagnetic plate 7, and use magnetic force to firmly adsorb and fix the trolley on the ferromagnetic plate 7 to ensure a stable state before the operation begins.

[0047] 2. Platform angle adjustment: According to specific operation requirements, the operator starts the driving mechanism 2 of the platform flip module through the control system. The system accurately controls the speed and direction of the reduction motor 201, and drives the reduction gear set to rotate the optical axis 11 and the ferromagnetic plate 7. The operator can control the ferromagnetic plate 7 to rotate slowly and steadily to the target angle according to the preset operation angle. For example, an inclination angle of more than 45° may be required when printing the bottom of a ship. When the ferromagnetic plate 7 reaches the specified angle, the reduction motor 201 is powered off and self-locked, and the ferromagnetic plate 7 is firmly maintained in the tilted state, providing a stable working basis for subsequent printing or manufacturing operations.

[0048] 3. Execute printing or manufacturing tasks: When the ferromagnetic plate 7 is kept at the required tilt angle, the ferromagnetic mobile printing device 6 (trolley) starts to execute the predetermined printing or additive and subtractive manufacturing tasks. The trolley moves along the set trajectory in the inner ring of the protective ring 901. The movement of the trolley will push the protective ring 901 to move with it. Since the protective ring 901 is connected to the support slide 14 located in the ferromagnetic plate slot through a closed-loop synchronous belt system, the movement of the protective ring 901 will be converted into the movement of the synchronous belt 8, thereby driving the support slide 14 to move synchronously in the slot. This linkage mechanism ensures the controllable movement of the trolley on the ferromagnetic plate, enabling it to accurately complete various operations.

[0049] 4. Protection response to accidental slippage: During the operation at a large inclination angle, if the ferromagnetic mobile printing device 6 (the trolley) experiences an accidental slippage beyond the control range due to insufficient adsorption force or other reasons, its moving speed will increase sharply. This sudden speed change will be directly transmitted to the protection ring 901 connected to the trolley, causing the closed-loop synchronous belt system to move rapidly accordingly. At this time, the braking mechanism installed on the support slide 14 will respond quickly. When the moving speed of the synchronous belt 8 exceeds the preset safety threshold, the ratchet rack on the eccentric wheel 503 inside the braking mechanism will immediately engage with the ratchet rack on the support slide, generating a strong braking force to forcibly lock the synchronous belt pulley 502 connected to this braking mechanism, thereby quickly braking the movement of the entire closed-loop synchronous belt system. Since the synchronous belt 8 is tightly connected to the thin rotating shaft 903 and the rotating synchronous belt pulley 902 in the protection ring 901, the stop of the synchronous belt 8 will immediately limit the movement of the protection ring 901. Even if the trolley still tries to continue sliding due to inertia or other reasons and pushes the protection ring 901, it will not be able to achieve because the synchronous belt system is firmly locked, ultimately effectively preventing the trolley from sliding out of the ferromagnetic plate 7 and protecting the device from damage.

[0050] 5. Completion of operation and reset of equipment: When the printing or manufacturing task is completed, the operator can control the platform flipping module to restore the ferromagnetic plate 7 to the horizontal state. Then, the trolley is safely removed from the ferromagnetic plate 7 through the gantry 4 and the electric hoist 3, completing the entire operation process.

[0051] The above-described embodiments have elaborated in detail the technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modification, supplement, and equivalent replacement made within the scope of the principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A safety protection device for a variable attitude printing test platform, characterized in that, It includes a platform base (1), a platform flipping module, and a motion protection module; The platform flipping module includes a driving mechanism (2) and a ferromagnetic plate (7). The ferromagnetic plate (7) is rotationally fixed to the platform base (1) through a optical axis (11) provided on the back surface. The output end of the driving mechanism (2) is connected to one end of the optical axis (11), and the ferromagnetic plate (7) is controlled by the driving mechanism (2) to achieve a 0 - 180° rotation; The motion protection module includes a protection ring (901) provided on the front surface of the ferromagnetic plate (7) for accommodating a ferromagnetic mobile printing device. Four groups of thin rotating shafts (903) and four rotating synchronous pulleys (902) are evenly and alternately provided on the outer side of the protection ring (901). Each group of thin rotating shafts (903) has two thin rotating shafts (903); On the front surface of the ferromagnetic plate (7), four equal - length sliding grooves are provided near the four sides. A support sliding seat (14) is provided in each sliding groove. Four groups of thin rotating shafts (903), four rotating synchronous pulleys (902), and four support sliding seats (14) are sequentially connected in series through a synchronous belt (8) to form a closed loop. Among them, the synchronous belt formed by connecting in series between each group of thin rotating shafts and the corresponding support sliding seat (14) is perpendicular to the sliding groove where the support sliding seat (14) is located.

2. The safety protection device for the variable attitude printing test platform according to claim 1, wherein The driving mechanism (2) includes a reduction motor (201) fixed on the platform base (1). The output shaft of the reduction motor (201) is connected to one end of the optical axis (11) through a reduction gear set.

3. The safety protection device for the variable attitude printing test platform according to claim 2, characterized in that Both ends of the optical axis are rotationally fixed to two bearing seats (206) provided on the platform base (1). One end of the optical axis is provided with a key groove and a shaft sleeve (204). The key groove is used to cooperate with the output end of the reduction gear set to transmit power, and the shaft sleeve (204) is used for axially fixing the optical axis (11).

4. The safety protection device for the variable attitude printing test platform according to claim 1, characterized in that On the back surface of the ferromagnetic plate (7), multiple rib plates (12) are provided. The optical axis (11) is fixed to the back surface of the ferromagnetic plate (7) through multiple optical axis fixing seats (13).

5. The safety protection device for the variable attitude printing test platform according to claim 1, wherein, On the front side of the support sliding seat (14), a synchronous pulley (502) for cooperating with the synchronous belt (8) is provided, and on the back side, an I - shaped sliding seat (504) for cooperating with the sliding groove is provided.

6. The safety protection device for the variable attitude printing test platform according to claim 5, characterized in that, At least two support sliding seats are provided with a braking mechanism for braking when the speed of the synchronous belt (8) is abnormal.

7. The safety protection device for the variable attitude printing test platform according to claim 6, characterized in that, The braking mechanism includes a grooved thin shaft (501) connected to the rotating shaft of the synchronous pulley (502) and an eccentric wheel (503) provided on the grooved thin shaft (501); A through - hole for accommodating the eccentric wheel (503) is provided at the upper end of the support sliding seat. Ratchet teeth are provided on the inner side of the through - hole and the outer side of the eccentric wheel (503). When the rotational speed of the synchronous pulley (502) exceeds a preset threshold, the movement of the eccentric wheel (503) triggers the ratchet teeth of the through - hole and the eccentric wheel (503) to lock, preventing the synchronous pulley (502) from continuing to rotate.

8. The safety protection device for the variable attitude printing test platform according to claim 6, characterized in that, The braking mechanism is provided in pairs, including a forward braking mechanism and a reverse braking mechanism. In the two braking mechanisms, the meshing directions of the ratchet teeth are opposite, and are respectively used for braking the synchronous belt (8) moving in opposite directions.

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