An accumulation-type BUFFER pallet conveyor device

Abstract

This invention discloses an accumulation-type BUFFER pallet conveying device, including a frame (1), on which a transmission chain is provided. The transmission chain drives multiple pallet assemblies to circulate and reciprocate on the frame (1). The device is characterized in that: the transmission chain is driven by a drive motor (2), and an overload protection mechanism is provided in conjunction with the drive motor (2). Pallet flipping mechanisms matching the pallet assemblies are provided at both ends of the frame (1). A chain protection tensioning mechanism is provided at the center of the top surface of the frame (1). At the same time, interlocking stop mechanisms matching the pallet assemblies are also provided at the front and rear of the frame (1).

Description

Technical Field

[0001] This invention relates to an automated conveying device, and more particularly to an accumulation-type BUFFER pallet conveying device. Background Technology

[0002] Conveyor line equipment is one of the main pieces of equipment on automotive welding production lines. Traditional conveyor line buffer equipment lacks accumulation functionality. Its structure consists of a basic frame with a drive shaft connected to a reducer and motor at one end and a driven shaft at the other. A chain drive connects the drive and driven shafts, and a pallet directly transports the workpieces. The required automotive parts are placed on the pallet, which circulates under the drive of the chain, transporting the pallet carrying the workpieces from one end of the frame to the other. Regardless of whether there are parts on the pallet, as long as the motor starts, it drives the chain, causing the pallet to move regardless of whether there are parts on it. When the workpiece reaches the loading port, a detection switch will detect a pallet with a workpiece. At this point, the motor stops, and the other pallets stop simultaneously. After the robot removes the workpiece, it sends a signal, restarts the motor, and continues operation. Additionally, when workers manually load items at the loading port, they need to press the start / stop button to stop the motor and the entire equipment. After loading, the worker presses the start / stop button again to restart the equipment. This method lacks an accumulation function, resulting in low equipment utilization, and the frequent starting and stopping of the motor can easily cause malfunctions. Furthermore, it cannot be guaranteed that all pallets passing through the loading port will be loaded with workpieces.

[0003] Meanwhile, in traditional transmission line equipment, if the chain or sprocket jams, it may cause the chain to break and the motor to overload and burn out, resulting in significant economic losses.

[0004] Furthermore, after prolonged use, the transmission chain will inevitably become elongated. Once the chain length increases, it will directly affect the transmission effect. In severe cases, the drive wheel may spin freely, and the motor's torque transmission may fail.

[0005] While conventional tensioner mechanisms can solve the above problems to some extent, they are limited in function, only providing tension within a certain range. Operators cannot know the current state of the tensioner mechanism. Furthermore, if the chain stretches too far beyond its effective range, or if the chain breaks, the conventional tensioner mechanism will also fail. Since conventional tensioner mechanisms cannot automatically detect these issues, operators may not be able to identify them in time, leading to even greater problems.

[0006] Meanwhile, traditional conveying equipment includes an interlocking stop mechanism. However, the conventional interlocking stop mechanism means that each cylinder can only control one stop lever. To achieve the same function, three sets of single-cylinder interlocking stop mechanisms are required. The linkage requires control based on switch signal programs, resulting in a complex structure, high cost, complex control, high spare parts cost, and low operating rate.

[0007] Therefore, a method or device is needed to solve the above-mentioned problems. Summary of the Invention

[0008] The present invention addresses the aforementioned shortcomings of the prior art by proposing an ingeniously designed and rationally laid-out BUFFER pallet conveying device that protects the drive motor, ensures smooth pallet rotation, protects the conveyor chain, and enables stop-and-go linkage using only one cylinder.

[0009] The technical solution of the present invention is: an accumulation-type buffer pallet conveying device, including a frame 1, on which a transmission chain is provided, and the transmission chain drives multiple pallet assemblies to circulate and reciprocate on the frame 1. The device is characterized in that: the transmission chain is driven by a drive motor 2, and an overload protection mechanism is provided in conjunction with the drive motor 2; pallet flipping mechanisms matching the pallet assemblies are respectively provided at both ends of the frame 1; a chain protection tensioning mechanism is provided at the center of the top surface of the frame 1; and interlocking stop mechanisms matching the pallet assemblies are also provided at the front and rear of the frame 1.

[0010] The pallet assembly includes a pallet body 1-1. A pair of limiting posts 1-2 are respectively provided on the front and rear sides of the pallet body 1-1. A pair of guide wheels 1-3 are respectively provided on the left and right ends of the pallet body 1-1. A first support 1-4 is provided in the middle of the bottom surface of the pallet body 1-1. Two symmetrically distributed drive gears 1-5 are rotatably supported on the first support 1-4. A damper 1-6, matching the drive gears 1-5, is also provided on the first support 1-4. The working end of the damper 1-6 contacts the side of the drive gear 1-5. Two symmetrically distributed tilting wheel mechanisms 1-7 are also provided on the bottom surface of the pallet body 1-1, with the two tilting wheel mechanisms 1-7 respectively located on both sides of the first support 1-4.

[0011] The flipping wheel mechanism 1-7 includes a second bracket 1-8 fixedly mounted on the bottom surface of the tray body 1-1. A first flipping wheel 1-9 is rotatably supported at the end of the second bracket 1-8. A swing frame 1-10 is rotatably connected to the top of the second bracket 1-8 via a pivot. A second flipping wheel 1-11 is rotatably connected to the end of the swing frame 1-10. A first spring 1-12 is also provided below the swing frame 1-10.

[0012] The pallet flipping mechanism includes a drive motor 2, the output end of which is connected to a drive shaft 1-14. A transmission chain gear 1-15 is provided in the middle of the drive shaft 1-14. The transmission chain gear 1-15 meshes with the transmission chain, and the transmission chain meshes with the drive gear 1-5. Two symmetrically distributed flipping drive disks 1-16 are also connected to the drive shaft 1-14. Multiple slots 1-17 are evenly distributed in the circumferential direction on the outer circumference of the flipping drive disks 1-16. The slots 1-17 are arc-shaped, and two adjacent slots 1-17 match the flipping wheel group composed of the first flipping wheel 1-9 and the second flipping wheel 1-11.

[0013] The overload protection mechanism includes a connector 2-2 fixedly connected to the drive motor 2, with a protrusion 2-3 on the connector 2-2. The overload protection mechanism also includes a C-shaped frame 2-4 fixedly connected to the frame 1. An adjusting bolt 2-7 is threaded onto the base plate 2-6 of the C-shaped frame 2-4, and a first preload nut 2-8 is threaded onto the adjusting bolt 2-7. The first preload nut 2-8 is located below the base plate 2-6. An adjusting sleeve 2-9 and a second spring 2-10 are also movably fitted onto the adjusting bolt 2-7. A groove 2-11 is provided inside the adjusting sleeve 2-9, and the bottom end of the second spring 2-10 is located within the groove 2-11.

[0014] The protrusion 2-3 is located inside the C-shaped frame 2-4. A long groove 2-12 is formed on the protrusion 2-3, and the adjusting bolt 2-7 is movably inserted into the long groove 2-12. Simultaneously, the top end of the adjusting bolt 2-7 also passes through a connecting hole 2-14 on the top plate 2-13 of the C-shaped frame 2-4. The adjusting sleeve 2-9 and the second spring 2-10 are located between the protrusion 2-3 and the bottom plate 2-6, with the top end of the second spring 2-10 contacting the bottom surface of the protrusion 2-3.

[0015] The adjusting bolt 2-7 is provided with a step 2-15, and the bottom of the adjusting sleeve 2-9 is provided with a limiting groove 2-16 that matches the step 2-15.

[0016] A sensor bracket 2-17 is provided on the top plate 2-13, and a sensor 2-18 that matches the end of the protrusion 2-3 is provided on the sensor bracket 2-17.

[0017] The chain protection tensioning mechanism includes a third bracket 3-1, on which multiple transmission wheels 3-2 are rotatably supported. A through hole is formed in one end plate 3-3 of the third bracket 3-1, and a tensioning shaft 3-4 is movably connected within the through hole. A pressure block 3-5 is movably sleeved on one end of the tensioning shaft 3-4. A pair of second tightening nuts 3-6, threadedly connected to the tensioning shaft 3-4, are also provided on the outside of the pressure block 3-5. The other end of the tensioning shaft 3-4 is connected to a connecting seat 3-7, which is slidably connected within the third bracket 3-1. A tensioning wheel 3-8 is rotatably supported on the connecting seat 3-7. A third spring 3-9 is also sleeved on the outside of the tensioning shaft 3-4, located between the end plate 3-3 and the pressure block 3-5.

[0018] A first pointer 3-10 is provided on the side of the pressure block 3-5, and a first label 3-11 matching the first pointer 3-10 is provided on the base plate of the third bracket 3-1. Indicator lines are drawn on the first label 3-11.

[0019] A second pointer is provided on the side of the connector 3-7, and a second label matching the second pointer is provided on the third bracket 3-1. Indicator lines are drawn on the second label.

[0020] The third bracket 3-1 is provided with a sensor bracket 3-14, and the sensor bracket 3-14 is provided with a long connecting groove 3-15. The long connecting groove 3-15 is connected to a sensor 3-16, and the sensor 3-16 is matched with a baffle 3-17 provided on the connecting seat 3-7.

[0021] The interlocking stop mechanism includes two symmetrically distributed support frames 4-1, and two symmetrically distributed rotating shafts 4-2 are rotatably supported between the two support frames 4-1. The support frames 4-1 and the rotating shafts 4-2 together form a rectangle. A dual-output cylinder 4-3 is set at the center of the rectangle. The two output ends of the dual-output cylinder 4-3 are respectively hinged to one end of a push-pull rod 4-4, while the other end of the push-pull rod 4-4 is hinged to the bottom end of a connecting block 4-5 fixedly connected to the rotating shaft 4-2.

[0022] A first stop block 4-6 and a second stop block 4-7 are also provided on the rotating shaft 4-2. Both the first stop block 4-6 and the second stop block 4-7 are parallel to the connecting block 4-5. The first stop block 4-6 is located in the material-feeding direction of the connecting block 4-5, while the second stop block 4-7 is located between the first stop block 4-6 and the connecting block 4-5. The length of the second stop block 4-7 is greater than the length of the first stop block 4-6. A third stop block 4-8 ​​is also provided at one end of the rotating shaft 4-2 in the material-discharging direction, and the third stop block 4-8 ​​is also parallel to the connecting block 4-5.

[0023] The interlocking stop mechanism further includes a first sensor 4-9, a second sensor 4-10, a third sensor 4-11, and a fourth sensor 4-12. The first sensor 4-9 and the second sensor 4-10 are respectively matched with different positions of one output end of the dual-output cylinder 4-3 in the extended and retracted states. The third sensor 4-11 corresponds to the material-stopping position of the third stop block 4-8, and the fourth sensor 4-12 is matched with the material-releasing position of the interlocking stop mechanism.

[0024] The first stop block 4-6 and the third stop block 4-8 ​​are connected to the same side of the rotating shaft 4-2, and the second stop block 4-7 and the first stop block 4-6 are respectively arranged on both sides of the rotating shaft 4-2.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] This type of accumulating BUFFER pallet conveyor is simple in structure, ingenious in design, and rational in layout. Addressing the various problems existing in current accumulating pallet conveyors, it features a unique structure. The pallet is equipped with an accumulating drive mechanism, allowing it to stop in certain situations to adjust its relative position to the tilting mechanism. Furthermore, it has two tilting wheels, one of which is floating and adjustable within a certain range. The pallet tilting mechanism includes a tilting drive disc with multiple arc-shaped grooves on its outer circumference. These grooves match the tilting wheels. When the pallet contacts the tilting mechanism, if their relative positions are incorrect, the tilting wheels automatically slide into place under the action of the arc-shaped grooves, thus automatically adjusting the relative position between the pallet and the tilting mechanism to prevent jamming.

[0027] The overload protection mechanism uses adjusting bolts, adjusting sleeves, springs, and other fastening mechanisms to secure the connector to the motor housing. When the motor is operating normally, the fastening force provided by these mechanisms holds the motor housing in the BUFFER device. However, if the motor is overloaded, the motor housing will experience a reverse torque. The connector then transmits this torque to the connecting mechanism, compressing the spring within. This compression causes the connector, directly connected to the motor housing, to move relative to the sensor in the device. The sensor automatically detects this change, determining that the motor is overloaded and automatically stopping the motor. This system can quickly and promptly identify abnormal motor conditions and automatically stop the motor, effectively protecting it.

[0028] The chain tensioning mechanism, in addition to tensioning the chain, can also display the current chain elongation in real time and promptly detect excessive chain elongation or chain breakage, alerting staff to intervene immediately. On one hand, it visually displays the chain's status, helping staff monitor its operation; on the other hand, it provides timely alerts for abnormalities, preventing major accidents.

[0029] The interlocking stop mechanism uses a dual-output cylinder as the actuator. Through a special transmission structure, it drives all the stops to move in tandem, thereby realizing the stopping or releasing operation of the pallet. It greatly simplifies the overall structure of the interlocking stop mechanism. Since the number of specific actuators (cylinders or hydraulic cylinders) is greatly reduced, its cost is greatly reduced. At the same time, its stop position is adjustable, it is easy to combine, each set of stops has an interlocking structure, the working process is stable and reliable, and it has the characteristics of easy disassembly and easy replacement of spare parts.

[0030] In summary, this device possesses numerous advantages and is particularly suitable for widespread application in this field, with a very broad market prospect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0032] Figure 2 This is a three-dimensional structural diagram of the tray portion in an embodiment of the present invention.

[0033] Figure 3 This is a three-dimensional structural diagram of the tray flipping mechanism in an embodiment of the present invention.

[0034] Figure 4 This is a three-dimensional structural diagram of the overload protection mechanism in an embodiment of the present invention.

[0035] Figure 5 This is a structural diagram of the connecting parts in the overload protection mechanism.

[0036] Figure 6 This is a structural diagram of the C-shaped frame part in the overload protection mechanism.

[0037] Figure 7 This is a schematic diagram of the working status of the overload protection mechanism.

[0038] Figure 8 This is a three-dimensional structural schematic diagram (direction one) of the chain protection tensioning mechanism in an embodiment of the present invention.

[0039] Figure 9 This is a three-dimensional structural diagram of the chain protection tensioning mechanism (direction two).

[0040] Figure 10 This is a schematic diagram of the working state of the chain protection tensioning mechanism.

[0041] Figure 11 This is a three-dimensional structural diagram of the interlocking stop mechanism in an embodiment of the present invention.

[0042] Figure 12 This is the main view of the interlocking stop mechanism (working state one).

[0043] Figure 13 This is a side view of the interlocking stop mechanism (working state one).

[0044] Figure 14 This is the main view of the interlocking stop mechanism (working state two).

[0045] Figure 15 This is a side view of the interlocking stop mechanism (working state two). Detailed Implementation

[0046] The specific embodiments of the present invention will be described below with reference to the accompanying drawings: Figures 1 to 15 As shown, an accumulation-type buffer pallet conveying device includes a frame 1, on which a transmission chain is provided. The transmission chain drives multiple pallet assemblies to reciprocate on the frame 1. The transmission chain is driven by a drive motor 2, and an overload protection mechanism is provided in conjunction with the drive motor 2. Pallet flipping mechanisms matching the pallet assemblies are respectively provided at both ends of the frame 1. A chain protection tensioning mechanism is provided at the center of the top surface of the frame 1. At the same time, interlocking stop mechanisms matching the pallet assemblies are also provided at the front and rear of the frame 1.

[0047] The pallet assembly includes a pallet body 1-1. A pair of limiting posts 1-2 are respectively provided on the front and rear sides of the pallet body 1-1. A pair of guide wheels 1-3 are respectively provided on the left and right ends of the pallet body 1-1. A first support 1-4 is provided in the middle of the bottom surface of the pallet body 1-1. Two symmetrically distributed drive gears 1-5 are rotatably supported on the first support 1-4. A damper 1-6, matching the drive gears 1-5, is also provided on the first support 1-4. The working end of the damper 1-6 contacts the side of the drive gear 1-5. Two symmetrically distributed tilting wheel mechanisms 1-7 are also provided on the bottom surface of the pallet body 1-1, with the two tilting wheel mechanisms 1-7 respectively located on both sides of the first support 1-4.

[0048] The flipping wheel mechanism 1-7 includes a second bracket 1-8 fixedly mounted on the bottom surface of the tray body 1-1. A first flipping wheel 1-9 is rotatably supported at the end of the second bracket 1-8. A swing frame 1-10 is rotatably connected to the top of the second bracket 1-8 via a pivot. A second flipping wheel 1-11 is rotatably connected to the end of the swing frame 1-10. A first spring 1-12 is also provided below the swing frame 1-10.

[0049] The pallet flipping mechanism includes a drive motor 2, the output end of which is connected to a drive shaft 1-14. A transmission chain gear 1-15 is provided in the middle of the drive shaft 1-14. The transmission chain gear 1-15 meshes with the transmission chain, and the transmission chain meshes with the drive gear 1-5. Two symmetrically distributed flipping drive disks 1-16 are also connected to the drive shaft 1-14. Multiple slots 1-17 are evenly distributed in the circumferential direction on the outer circumference of the flipping drive disks 1-16. The slots 1-17 are arc-shaped, and two adjacent slots 1-17 match the flipping wheel group composed of the first flipping wheel 1-9 and the second flipping wheel 1-11.

[0050] The overload protection mechanism includes a connector 2-2 fixedly connected to the drive motor 2, with a protrusion 2-3 on the connector 2-2. The overload protection mechanism also includes a C-shaped frame 2-4 fixedly connected to the frame 1. An adjusting bolt 2-7 is threaded onto the base plate 2-6 of the C-shaped frame 2-4, and a first preload nut 2-8 is threaded onto the adjusting bolt 2-7. The first preload nut 2-8 is located below the base plate 2-6. An adjusting sleeve 2-9 and a second spring 2-10 are also movably fitted onto the adjusting bolt 2-7. A groove 2-11 is provided inside the adjusting sleeve 2-9, and the bottom end of the second spring 2-10 is located within the groove 2-11.

[0051] The protrusion 2-3 is located inside the C-shaped frame 2-4. A long groove 2-12 is formed on the protrusion 2-3, and the adjusting bolt 2-7 is movably inserted into the long groove 2-12. Simultaneously, the top end of the adjusting bolt 2-7 also passes through a connecting hole 2-14 on the top plate 2-13 of the C-shaped frame 2-4. The adjusting sleeve 2-9 and the second spring 2-10 are located between the protrusion 2-3 and the bottom plate 2-6, with the top end of the second spring 2-10 contacting the bottom surface of the protrusion 2-3.

[0052] The adjusting bolt 2-7 is provided with a step 2-15, and the bottom of the adjusting sleeve 2-9 is provided with a limiting groove 2-16 that matches the step 2-15.

[0053] A sensor bracket 2-17 is provided on the top plate 2-13, and a sensor 2-18 that matches the end of the protrusion 2-3 is provided on the sensor bracket 2-17.

[0054] The chain protection tensioning mechanism includes a third bracket 3-1, on which multiple transmission wheels 3-2 are rotatably supported. A through hole is formed in one end plate 3-3 of the third bracket 3-1, and a tensioning shaft 3-4 is movably connected within the through hole. A pressure block 3-5 is movably sleeved on one end of the tensioning shaft 3-4. A pair of second tightening nuts 3-6, threadedly connected to the tensioning shaft 3-4, are also provided on the outside of the pressure block 3-5. The other end of the tensioning shaft 3-4 is connected to a connecting seat 3-7, which is slidably connected within the third bracket 3-1. A tensioning wheel 3-8 is rotatably supported on the connecting seat 3-7. A third spring 3-9 is also sleeved on the outside of the tensioning shaft 3-4, located between the end plate 3-3 and the pressure block 3-5.

[0055] A first pointer 3-10 is provided on the side of the pressure block 3-5, and a first label 3-11 matching the first pointer 3-10 is provided on the base plate of the third bracket 3-1. Indicator lines are drawn on the first label 3-11.

[0056] A second pointer is provided on the side of the connector 3-7, and a second label matching the second pointer is provided on the third bracket 3-1. Indicator lines are drawn on the second label.

[0057] The third bracket 3-1 is provided with a sensor bracket 3-14, and the sensor bracket 3-14 is provided with a long connecting groove 3-15. The long connecting groove 3-15 is connected to a sensor 3-16, and the sensor 3-16 is matched with a baffle 3-17 provided on the connecting seat 3-7.

[0058] The interlocking stop mechanism includes two symmetrically distributed support frames 4-1, and two symmetrically distributed rotating shafts 4-2 are rotatably supported between the two support frames 4-1. The support frames 4-1 and the rotating shafts 4-2 together form a rectangle. A dual-output cylinder 4-3 is set at the center of the rectangle. The two output ends of the dual-output cylinder 4-3 are respectively hinged to one end of a push-pull rod 4-4, while the other end of the push-pull rod 4-4 is hinged to the bottom end of a connecting block 4-5 fixedly connected to the rotating shaft 4-2.

[0059] A first stop block 4-6 and a second stop block 4-7 are also provided on the rotating shaft 4-2. Both the first stop block 4-6 and the second stop block 4-7 are parallel to the connecting block 4-5. The first stop block 4-6 is located in the material-feeding direction of the connecting block 4-5, while the second stop block 4-7 is located between the first stop block 4-6 and the connecting block 4-5. The length of the second stop block 4-7 is greater than the length of the first stop block 4-6. A third stop block 4-8 ​​is also provided at one end of the rotating shaft 4-2 in the material-discharging direction, and the third stop block 4-8 ​​is also parallel to the connecting block 4-5.

[0060] The interlocking stop mechanism further includes a first sensor 4-9, a second sensor 4-10, a third sensor 4-11, and a fourth sensor 4-12. The first sensor 4-9 and the second sensor 4-10 are respectively matched with different positions of one output end of the dual-output cylinder 4-3 in the extended and retracted states. The third sensor 4-11 corresponds to the material-stopping position of the third stop block 4-8, and the fourth sensor 4-12 is matched with the material-releasing position of the interlocking stop mechanism.

[0061] The first stop block 4-6 and the third stop block 4-8 ​​are connected to the same side of the rotating shaft 4-2, and the second stop block 4-7 and the first stop block 4-6 are respectively arranged on both sides of the rotating shaft 4-2.

[0062] The working process of the accumulating BUFFER pallet conveying device in this embodiment of the invention is as follows: When multiple pallets are needed to transport workpieces, the drive motor 2 is started by the control system. The drive motor 2 drives the conveyor chain to move. During the movement of the conveyor chain, the pallet assembly connected to it will move along the frame 1. When the pallet assembly moves to both ends of the frame 1, it will be flipped 180° under the action of the pallet flipping mechanism, flipping from the bottom of the frame 1 to the top of the frame 1, and then continues to move. During the movement, the workpieces on the pallet are transported from one end of the frame 1 to the other end.

[0063] During operation, the chain tensioning mechanism can tension the chain while effectively protecting it from breakage, while the interlocking stop mechanism can sequentially stop the pallet near the pallet flipping position; the overload protection mechanism can prevent the motor from overloading and malfunctioning when the chain jams.

[0064] The pallet flipping mechanism is set at both ends of the frame 1. At the same time, closed racetrack-shaped conveying and guide rails are also set on both sides of the frame 1. The guide wheels 3 in the pallet assembly are connected to the above-mentioned guide rails and cannot be dislodged from them.

[0065] When drive motor 2 starts, it drives the transmission chain gear 1-15 and the tilting drive disk 1-16 to rotate synchronously via drive shaft 1-14. Transmission chain gear 1-15 drives the transmission chain. During this movement, drive gear 1-5 meshes with it and, under the action of damper 1-6, prevents drive gear 1-5 from rotating relative to pallet body 1-1. Therefore, the transmission chain drives the pallet body 1-1 to move as a whole via drive gear 1-5. During the movement of pallet body 1-1, guide wheels 1-3 at its left and right ends roll in guide rails, providing guidance. Simultaneously, a pair of limiting posts 1-2 are provided on the front and rear ends of pallet body 1-1. These limiting posts 1-2 prevent collisions between adjacent pallet bodies 1-1, protecting the pallet body 1-1 itself, and ensuring a certain distance between adjacent pallet bodies 1-1.

[0066] If the pallet 1-1 encounters resistance under certain circumstances, the static friction between the damper 1-6 and the drive gear 1-5 is insufficient to resist the resistance. In this case, the drive gear 1-5 will overcome the static friction and rotate. At this time, the pallet 1-1 will remain at its current position, while the drive gear 1-5 will rotate relative to the pallet 1-1. The conveyor chain will continue to move normally. In other words, the stopping of one (or several) pallets 1-1 will not affect the normal operation of the conveyor chain.

[0067] When the tray body 1-1 moves to the flip drive disk 1-16, the first flip wheel 1-9 is engaged in a slot 1-17, and the second flip wheel 1-11 is engaged in another slot 1-17 adjacent to the first slot 1-17. At this time, through the two flip wheels and the slot structure, a temporary connection between the tray body 1-1 and the flip drive disk 1-16 is achieved. In this way, the rotation of the flip drive disk 1-16 will drive the tray body 1-1 to flip (up or down) until it flips 180°.

[0068] During the above process, since the tray body 1-1 itself is rigid and the two adjacent slots 1-17 are on the same arc, theoretically it is impossible for the two flipping wheels to be stuck in the two slots 1-17 at the same time. Therefore, the tray body 1-1 may fall off the flipping drive disk 1-16 during the flipping process.

[0069] To avoid the aforementioned problems, a floating flipping wheel mechanism 1-7 is provided on the tray in this device. The relative position between the first flipping wheel 1-9 and the tray body 1-1 in this mechanism is fixed, but the second flipping wheel 1-11 is set on a swing frame 1-10. When the two flipping wheels are connected in the slots 1-17 at the same time and flip with the flipping drive disk 1-16, the swing frame 1-10 will apply a certain pressure to the slots 1-17 that are in contact with the second flipping wheel 1-11 under the action of the spring 1-12, thereby ensuring that the two flipping wheels can contact the two slots 1-17 at the same time and preventing the tray body 1-1 from falling off during the flipping process.

[0070] At the same time, this design of the flipping wheel and the arc-shaped slot allows the flipping wheel to smoothly enter the slot and lock in place, even if there is a certain deviation in the relative position between the two, thus avoiding the problem that the flipping mechanism cannot drive the pallet to flip.

[0071] The overload protection mechanism operates as follows: First, the connector 2-2 is fixedly installed on the drive motor 2 using bolts and other fasteners, making them a single unit. The protrusion 2-3 extends into the C-shaped frame 2-4. An adjusting bolt 2-7 is threaded through the base plate 2-6 of the C-shaped frame 2-4. The top of the adjusting bolt 2-7 passes through the long slot 2-12 on the protrusion 2-3 and is inserted into the connecting hole 2-14 on the top plate 2-13 of the C-shaped frame 2-4. At this time, the spring 2-10 presses the protrusion 2-3 firmly against the bottom surface of the top plate 2-13. The protrusion 2-3 is then fixed to the frame 2-5 of the BUFFER device via the C-shaped frame 2-4.

[0072] During normal operation, drive motor 2 operates, outputting torque to drive the chain or sprocket, and the device functions normally. In this state, sensor 2-18 can detect protrusion 2-3, and the control system connected to sensor 2-18 knows that drive motor 2 is in normal operating condition.

[0073] If the chain or sprocket jams, the output shaft of drive motor 2 will not be able to continue rotating. At this time, the torque will be transmitted to drive motor 2 in the reverse direction. The housing of drive motor 2 will rotate under the force. When it rotates, it will drive the connecting part 2-2 to rotate synchronously. The protrusion 2-3 will press down on spring 2-10. Spring 2-10 will be compressed, and protrusion 2-3 will swing downward. If sensor 2-18 cannot detect protrusion 2-3, it will send a signal to the control system. After receiving the signal, the control system will immediately control the motor to stop, thereby achieving the purpose of overload protection.

[0074] During use, the clamping force of spring 2-10 on protrusion 2-3 can be adjusted according to actual conditions and needs. To adjust, simply rotate adjusting bolt 2-7 to make it move axially relative to base plate 2-6. When adjusting bolt 2-7 moves, step 2-15 on it will push the limiting groove 2-16 at the bottom of adjusting sleeve 2-9, thereby pushing adjusting sleeve 2-9 to move relative to base plate 2-6. Since the bottom of spring 2-10 is located in the groove on adjusting sleeve 2-9, the compression degree of spring 2-10 in the initial state can be changed in this way, thereby adjusting the clamping force on protrusion 2-3. After adjustment, rotate tightening nut 2-8 to lock adjusting bolt 2-7.

[0075] The chain protection tensioning mechanism works as follows: The chain is wound around the mechanism, and the third spring 3-9 always presses against the pressure block 3-5. Therefore, under the action of the third spring 3-9, the tensioning shaft 3-4 will apply a force to the connecting seat 3-7 in the direction of the end plate 3-3. Under the action of the spring force, the tensioning wheel 3-8 supported on the connecting seat 3-7 is rotated to tension the chain.

[0076] As the working time increases, the chain may lengthen under the action of tension. When the chain lengthens, the tension wheel 3-8 and the connecting seat 3-7 will move along the axial direction of the tension shaft 3-4 under the action of the third spring 3-9. The above movement can compensate for the chain's extension, thereby ensuring that the chain always maintains a stable connection with all the sprockets.

[0077] Under normal operating conditions, sensor 3-16 can detect the baffle 3-17 set on connector 3-7. However, once the chain extension exceeds the upper limit, the displacement of connector 3-7 becomes too large, causing sensor 3-16 to fail to detect baffle 3-17. The sensor will then send a signal to the control system connected to it via a wire. The control system will then know that the chain extension is too large and will control the drive motor 2 to stop to prevent safety accidents or unexpected events. At the same time, it will also issue an alarm through an audible and visual warning device to remind the staff to handle the situation in a timely manner.

[0078] If the chain breaks, under the action of the third spring 3-9, the connecting seat 3-7 will move quickly, and the baffle 3-17 will also leave the detection range of the sensor 3-16. The working process of the control system is the same as described above.

[0079] Under normal working conditions, as the connecting seat 3-7 moves, the second pointer connected to it will also shift relative to the bracket 3-1. In this way, the second pointer will indicate different scale lines on the second label. The staff only needs to observe the second label to intuitively determine the current extension of the chain.

[0080] When installing this mechanism, the user needs to drive the pressure block 3-5 to move on the tension shaft 3-4 by rotating the first pre-tightening nut 3-6 to compress the third spring 3-9. During operation, the user can observe the position indicated by the first pointer 3-10 on the first label 3-11 and use the indicator line on the first label 3-11 as a reference to determine the pressing position of the pressure block 3-5. After the pressure block 3-5 is in place, tighten the second pre-tightening nut 3-6.

[0081] The working process of the interlocking stop mechanism is as follows: In the initial state, a tray body 1-1 is first released, and the dual output cylinder 4-3 is in the retraction state. At this time, the first stop block 4-6, the second stop block 4-7 and the third stop block 4-8 ​​are all in the vertical state. At this time, the third stop block 4-8 ​​blocks the first tray body 1-1, and the first stop block 4-6 blocks the second tray body 1-1.

[0082] Then the control system sends a signal to the device, and the dual-output cylinder 4-3 simultaneously drives the two push-pull rods 4-4 to extend. The other end of the push-pull rod 4-4 pushes the bottom end of the connecting block 4-5, which in turn drives the rotating shaft 4-2 to rotate. Since the two push-pull rods 4-4 move in opposite directions, the two rotating shafts 4-2 also rotate in opposite directions.

[0083] When the rotating shaft 4-2 rotates, its first stop 4-6, second stop 4-7, and third stop 4-8 all swing outwards. When the third stop 4-8 swings into position, it no longer obstructs the limiting post 1-2 on the first pallet 1-1, and the first pallet 1-1 will move forward under the action of the conveyor belt and flip along the conveyor belt track. Similarly, the first stop 4-6 no longer obstructs the limiting post 1-2 on the second pallet 1-1, and the second pallet 1-1 also moves forward under the action of the conveyor belt. However, at this time, the second stop 4-7 blocks the path of the second pallet 1-1, so the second pallet 1-1 will be blocked by the second stop 4-7.

[0084] When the dual-output cylinder 4-3 extends, the third stop 4-8 releases the first tray body 1-1, and the second stop 4-7 blocks the second tray 4-13;

[0085] When the third sensor 4-11 detects that the material blocking position of the third stop 4-8 is empty, and the fourth sensor 4-12 detects that a pallet 1-1 is passing by the material feeding position on the conveyor belt, the control system determines that the second pallet 1-1 can be released at this time. The control system then sends a command to the dual-output cylinder 4-3, which simultaneously drives the two push-pull rods 4-4 to retract, and the two rotating shafts 4-2 swing in opposite directions at the same time. The first stop 4-6, the second stop 4-7, and the third stop 4-8 return to the vertical state. At this time, the second stop 4-7 no longer blocks the second pallet 1-1. The second pallet 1-1 stops moving when it reaches the third stop 4-8, while the third pallet 4-13 is blocked by the first stop 4-6. At this time, the device returns to the initial state.

[0086] When the dual-output cylinder 4-3 is retracted, the second stop 4-7 releases the second tray body 1-1, and the second tray body 1-1 is stopped at the third stop 4-8, while the first stop 64 blocks the third tray body 1-1.

[0087] By repeating the above operations, the stopping and releasing operations of multiple pallets 1-1 can be performed one by one;

[0088] During the above process, the first sensor 4-9 and the second sensor 4-10 can detect the working status of the dual-output cylinder 4-3 so that the control system can keep track of the current status of the dual-output cylinder 4-3 at any time.

Claims

1. An accumulation-type buffer pallet conveying device, comprising a frame (1), wherein a transmission chain is provided on the frame (1), and the transmission chain drives multiple pallet assemblies to reciprocate on the frame (1), characterized in that: The transmission chain is driven by a drive motor (2), and an overload protection mechanism is provided in conjunction with the drive motor (2). The two ends of the frame (1) are respectively provided with pallet flipping mechanisms that match the pallet assembly. A chain protection tensioning mechanism is provided at the center of the top surface of the frame (1). At the same time, interlocking stop mechanisms that match the pallet assembly are also provided at the front and rear of the frame (1). The overload protection mechanism includes a connector (2-2) fixedly connected to the drive motor (2), and a protrusion (2-3) provided on the connector (2-2). The overload protection mechanism also includes a C-shaped frame (2-4), which is fixedly connected to the frame (1). An adjusting bolt (2-7) is threadedly connected to the base plate (2-6) of the C-shaped frame (2-4). A first tightening nut (2-8) is threadedly connected to the adjusting bolt (2-7). The first tightening nut (2-8) is located below the base plate (2-6). An adjusting sleeve (2-9) and a second spring (2-10) are also movably sleeved on the adjusting bolt (2-7). A groove (2-11) is provided inside the adjusting sleeve (2-9), and the bottom end of the second spring (2-10) is located inside the groove (2-11). The protrusion (2-3) is located inside the C-shaped frame (2-4). A long groove (2-12) is provided on the protrusion (2-3). The adjusting bolt (2-7) is movably inserted into the long groove (2-12). Simultaneously, the top end of the adjusting bolt (2-7) is also inserted into a connecting hole (2-14) on the top plate (2-13) of the C-shaped frame (2-4). The adjusting sleeve (2-9) and the second spring (2-10) are located between the protrusion (2-3) and the bottom plate (2-6). Simultaneously, the top end of the second spring (2-10) contacts the bottom surface of the protrusion (2-3). The adjusting bolt (2-7) is provided with a step (2-15), and the bottom of the adjusting sleeve (2-9) is provided with a limiting groove (2-16) that matches the step (2-15). A sensor bracket (2-17) is provided on the top plate (2-13), and a sensor (2-18) that matches the end of the protrusion (2-3) is provided on the sensor bracket (2-17). The interlocking stop mechanism includes two symmetrically distributed support frames (4-1). Two symmetrically distributed rotating shafts (4-2) are rotatably supported between the two support frames (4-1). The support frames (4-1) and rotating shafts (4-2) together form a rectangle. A dual-output cylinder (4-3) is located at the center of this rectangle. The two output ends of the dual-output cylinder (4-3) are respectively hinged to one end of a push-pull rod (4-4), while the other end of the push-pull rod (4-4) is hinged to the bottom end of a connecting block (4-5) fixedly connected to the rotating shaft (4-2). A first stop (4-6) and a second stop (4-7) are also provided on the rotating shaft (4-2). Both the first stop (4-6) and the second stop (4-7) are parallel to the connecting block (4-5). The first stop (4-6) is located in the material-feeding direction of the connecting block (4-5), while the second stop (4-7) is located between the first stop (4-6) and the connecting block (4-5). The length of the second stop (4-7) is greater than the length of the first stop (4-6). A third stop (4-8) is also provided at one end of the rotating shaft (4-2) in the material-discharging direction, and the third stop (4-8) is also parallel to the connecting block (4-5). The interlocking stop mechanism further includes a first sensor (4-9), a second sensor (4-10), a third sensor (4-11), and a fourth sensor (4-12). The first sensor (4-9) and the second sensor (4-10) are respectively matched with different positions of one output end of the dual-output cylinder (4-3) in the extended and retracted states. The third sensor (4-11) corresponds to the material-stopping position of the third stop block (4-8), and the fourth sensor (4-12) is matched with the material-releasing position of the interlocking stop mechanism. The first stop (4-6) and the third stop (4-8) are connected on the same side of the rotating shaft (4-2), and the second stop (4-7) and the first stop (4-6) are respectively located on both sides of the rotating shaft (4-2).

2. The accumulating buffer pallet conveying device according to claim 1, characterized in that: The pallet assembly includes a pallet body (1-1). A pair of limiting posts (1-2) are respectively provided on the front and rear sides of the pallet body (1-1). A pair of guide wheels (1-3) are respectively provided on the left and right ends of the pallet body (1-1). A first support (1-4) is provided in the middle of the bottom surface of the pallet body (1-1). Two symmetrically distributed drive gears (1-5) are rotatably supported on the first support (1-4). A damper (1-6) matching the drive gears (1-5) is also provided on the first support (1-4). The working end of the damper (1-6) contacts the side of the drive gear (1-5). Two symmetrically distributed tilting wheel mechanisms (1-7) are also provided on the bottom surface of the pallet body (1-1), and the two tilting wheel mechanisms (1-7) are respectively located on both sides of the first support (1-4). The flipping wheel mechanism (1-7) includes a second bracket (1-8) fixedly mounted on the bottom surface of the tray body (1-1). The end of the second bracket (1-8) is rotatably supported by a first flipping wheel (1-9). At the same time, a swing frame (1-10) is rotatably connected to the top of the second bracket (1-8) via a pivot. The end of the swing frame (1-10) is rotatably connected to a second flipping wheel (1-11). A first spring (1-12) is also provided below the swing frame (1-10). The pallet flipping mechanism includes a drive motor (2), the output end of which is connected to a drive shaft (1-14). A transmission chain gear (1-15) is provided in the middle of the drive shaft (1-14). The transmission chain gear (1-15) meshes with the transmission chain, and the transmission chain meshes with the drive gear (1-5). Two symmetrically distributed flipping drive disks (1-16) are also connected to the drive shaft (1-14). Multiple slots (1-17) are evenly distributed in the circumferential direction on the outer circumference of the flipping drive disk (1-16). The slots (1-17) are arc-shaped, and two adjacent slots (1-17) match the flipping wheel group composed of the first flipping wheel (1-9) and the second flipping wheel (1-11).

3. The accumulating buffer pallet conveying device according to claim 1, characterized in that: The chain protection tensioning mechanism includes a third bracket (3-1), on which multiple transmission wheels (3-2) are rotatably supported. A through hole is provided on one end plate (3-3) of the third bracket (3-1), and a tensioning shaft (3-4) is movably connected within the through hole. A pressure block (3-5) is movably sleeved on one end of the tensioning shaft (3-4). A pair of second tightening nuts (3-6) threadedly connected to the tensioning shaft (3-4) are also provided on the outside of the pressure block (3-5). The other end of the tensioning shaft (3-4) is connected to a connecting seat (3-7), which is slidably connected within the third bracket (3-1). A tensioning wheel (3-8) is rotatably supported on the connecting seat (3-7). A third spring (3-9) is also sleeved on the outside of the tensioning shaft (3-4), located between the end plate (3-3) and the pressure block (3-5). The pressure block (3-5) has a first pointer (3-10) on its side, and a first label (3-11) matching the first pointer (3-10) is provided on the base plate of the third bracket (3-1). Indicator lines are drawn on the first label (3-11). A second pointer is provided on the side of the connector (3-7), and a second label matching the second pointer is provided on the third bracket (3-1). The second label has indicator lines drawn on it. The third bracket (3-1) is provided with a sensor bracket (3-14), and the sensor bracket (3-14) is provided with a long connecting groove (3-15). A sensor (3-16) is connected in the long connecting groove (3-15), and the sensor (3-16) is matched with a baffle (3-17) provided on the connecting seat (3-7).

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