Multi-layer drying production line

Abstract

This invention discloses a device comprising a drying oven, a pallet stacking device, and a pallet unpacking device. The pallet stacking device includes a feeding conveyor mechanism, a first pallet lifting mechanism, and a first pallet supporting mechanism. The supporting component of the first pallet lifting mechanism extends upward through the gap in the feeding conveyor mechanism, lifting the pallets on the feeding conveyor mechanism to the first pallet supporting mechanism. A pair of support plates of the first pallet supporting mechanism extend out to support the pallets, and multiple pallets are stacked sequentially on the first pallet supporting mechanism from bottom to top. The pallet stacking device of this invention neatly stacks multiple pallets containing workpieces from bottom to top, and the feeding conveyor mechanism feeds multiple layers of pallets into the drying oven. This process is repeated to achieve multi-layer pallet assembly line feeding. The pallet unpacking device disassembles each stack of pallets sequentially from bottom to top, facilitating the unloading of dried workpieces and the loading of workpieces to be dried. This cycle enables multi-layer continuous flow drying operations for workpieces.

Description

Technical Field

[0001] This invention relates to the field of workpiece drying in industrial production lines, and more particularly to a multi-layer drying production line. Background Technology

[0002] High-voltage insulators are core components of power transmission systems, and their production process must strictly adhere to requirements for insulation performance and structural precision. The production process mainly includes key stages such as raw material handling, molding, curing, processing, and testing. Curing is a crucial step in the production of high-voltage insulators, primarily achieved using drying ovens or drying furnaces. In actual production, traditional tunnel drying ovens are mostly single-layer drying systems, resulting in low drying efficiency and failing to meet the demands of large-scale insulator drying. Therefore, some companies have improved the drying efficiency of insulators by installing multiple layers of conveyor rollers within tunnel drying ovens. However, due to the often long length of tunnel drying ovens, the large number of rollers per layer, and the multiple layers of rollers, maintenance is extensive and difficult. Summary of the Invention

[0003] In view of this, the present invention proposes a multi-layer drying production line, which realizes multi-layer continuous drying of workpieces without increasing the number of roller layers in the drying furnace, thus significantly improving drying efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The multi-layer drying production line of the present invention includes a drying oven with a built-in conveyor roller conveyor, and also includes a pallet stacking device and a pallet unloading device. The pallet stacking device is located on the inlet side of the drying oven and includes a feeding conveyor mechanism connected to the input end of the conveyor roller conveyor, a first pallet lifting mechanism located below the feeding conveyor mechanism, and a first pallet supporting mechanism located above the feeding conveyor mechanism. The supporting component of the first pallet lifting mechanism extends upward through the gap in the feeding conveyor mechanism, lifting the pallets on the feeding conveyor mechanism to the first pallet supporting mechanism. A pair of pallet plates of the first pallet supporting mechanism extend out to support the pallets, and multiple pallets are stacked sequentially from bottom to top. The first pallet support mechanism is located on the outlet side of the drying oven. The pallet dismantling device includes a feeding conveyor connected to the output end of the conveyor roller, a second pallet lifting mechanism located below the feeding conveyor, and a second pallet support mechanism located above the feeding conveyor. The support component of the second pallet lifting mechanism extends upward through the gap of the feeding conveyor and lifts multiple pallets, so that the second pallet from bottom to top rises to the second pallet support mechanism. The second pallet support mechanism lifts the second pallet below it, and the second pallet lifting mechanism drives the lowest pallet down onto the feeding conveyor, so that multiple pallets are dismantled onto the feeding conveyor in sequence from bottom to top.

[0005] The beneficial effects are as follows: This invention installs a pallet stacking device at the inlet end of the drying oven, which can stack multiple pallets containing workpieces together from bottom to top. Then, the feeding conveyor mechanism sends the multi-layered pallets into the drying oven, and this process is repeated to realize the feeding of materials on the production line. This invention also installs a pallet unpacking device at the outlet end of the drying wheel, which can disassemble each stack of pallets from bottom to top, facilitating the unloading of dried workpieces from the pallets and the loading of workpieces to be dried. This cycle can realize multi-layer continuous flow drying of workpieces, improving drying efficiency.

[0006] Preferably, the pallet includes a horizontally arranged base frame, a support net disposed on the base frame, and support legs disposed at each corner of the base frame. Positioning holes are formed on the bottom surface of each corner of the base frame, and each pallet has a positioning head on its top that mates with the positioning holes, allowing multiple pallets to be sequentially inserted from bottom to top through the positioning holes and positioning heads. In this invention, pallets are neatly stacked through the positioning holes and positioning heads, further ensuring the stable transport of each stack of pallets and improving safety.

[0007] Preferably, the first pallet lifting mechanism and the second pallet lifting mechanism have the same structure. The first pallet support mechanism includes a base mounting frame, a power mechanism, a lifting structure driven by the power mechanism, and a guide structure for guiding and limiting the lifting structure. The power mechanism includes a motor, a primary transmission assembly connected to the motor, and a secondary transmission assembly connected to the primary transmission assembly. The primary transmission assembly includes a pair of transmission shafts rotatably mounted on the base mounting frame. The two transmission shafts are horizontally arranged above the base mounting frame. Each end of the transmission shaft is provided with a secondary transmission assembly. The secondary transmission assembly is a rocker arm structure, which includes a rocker arm with one end mounted on the transmission shaft and a roller at the other end of the rocker arm. The roller is rotatably connected to the mounting shaft at the end of the rocker arm. The lifting structure is a lifting frame located outside the power mechanism. The support assembly is located on the lifting frame and above the power mechanism. The lifting frame has a pair of vertical mounting plates on both sides of the transmission shaft. Each vertical mounting plate has a horizontally provided limiting groove at its lower part. The length direction of the limiting groove is perpendicular to the transmission shaft. The roller of the secondary transmission assembly is located in the corresponding limiting groove. The beneficial effects are as follows: The first and second pallet lifting mechanisms in this invention have identical structures. Both use a motor as a power source and achieve power output through two drive shafts. Each drive shaft has a rocker arm-type secondary transmission assembly installed at both ends, thus achieving smooth lifting of the lifting frame and further ensuring smooth lifting of the support assembly. The lifting frame adopts a square frame structure, which is structurally stable and has high structural strength, providing reliable support for the support assembly. Furthermore, both the first and second pallet lifting mechanisms of this invention can adjust the height of the pallets, cooperating with their respective matching pallet support mechanisms to achieve pallet stacking and unpacking.

[0008] Preferably, the primary transmission assembly includes two chain drive pairs with reduction ratios. The driving gear of each chain drive pair is mounted on the motor shaft of the motor, and the driven gears of the two chain drive pairs are correspondingly mounted on the two transmission shafts. The motor transmits torque synchronously to the two transmission shafts through the two chain drive pairs.

[0009] Preferably, the bottom mounting frame includes a pair of longitudinal beams spaced apart from each other on the left and right and a pair of transverse beams. The longitudinal beams are spaced apart and parallel to the limiting groove. The end of the drive shaft is rotatably mounted on the longitudinal beams through a bearing seat. The crossbeam is parallel to the drive shaft and located outside the drive shaft; the guide structure consists of two sets, with each crossbeam connected to the lifting frame via a set of guide structures. The guide structure includes at least two guide shafts spaced apart on the crossbeam, a linear bearing matched with each guide shaft, and a first connecting plate connecting the at least two linear bearings together; the lifting frame also includes a pair of second connecting plates connecting the two vertical mounting plates, with the bottom flange of each second connecting plate fixedly connected to the corresponding first connecting plate. The lifting frame also includes a pair of horizontally arranged reinforcing beams, which are located outside the crossbeam, and each of the reinforcing beams is fixedly connected to the two limiting grooves at both ends.

[0010] The beneficial effects are: the pallet lifting mechanism of the present invention uses a motor as a power source, which transmits power synchronously to two horizontally arranged drive shafts through a chain drive pair, and then to the lifting frame through a rocker arm structure, thus realizing the smooth lifting and lowering of the lifting frame, improving load-bearing capacity, and extending the maintenance cycle.

[0011] Preferably, the supporting components consist of two sets, each set including a portal frame and supporting plates disposed on both sides of the connecting beam of the portal frame. The two vertical legs of the portal frame are respectively fixedly connected to a vertical mounting plate. In this invention, each pallet lifting mechanism has two sets of supporting components, which work together to provide a safe and reliable foundation support for the pallet, thus improving safety.

[0012] Preferably, the first pallet supporting mechanism and the second pallet supporting mechanism have the same structure. The first pallet supporting mechanism includes a frame disposed at the entrance of the drying oven and telescopic mechanisms disposed on the front and rear sides of the frame. Each telescopic mechanism includes a mounting component fixed to the frame, a linear power source disposed on the mounting component, and a pallet. The pallet is slidably disposed on the upper part of the mounting component and is connected to the linear power source. The supporting end of the pallet has an avoidance notch to avoid the supporting pallet. The two telescopic mechanisms are disposed opposite to each other, and the pallets of the two telescopic mechanisms extend in opposite directions at the same time to support the pallet.

[0013] In this invention, the supporting component is a vertically arranged portal frame, and each pallet has an avoidance notch, so that after the pallet lifting mechanism lifts the pallet into place, a pair of pallets of the pallet supporting mechanism can move towards each other to the bottom of the pallet, ensuring that the pallet supporting mechanism can support the pallet, so as to facilitate the stacking of the next pallet or the unpacking of pallets one by one from bottom to top, thereby improving the automation level of the drying production line of this invention.

[0014] Preferably, the linear power source is a horizontally arranged hydraulic cylinder or a horizontally arranged pneumatic cylinder, or a motor and a synchronous belt drive pair connected to the motor, or a motor and an eccentric roller connected to the motor; the top of the mounting component is provided with a slide rail at intervals, and the bottom of the pallet is provided with a slider to ensure the linear reciprocating motion of the pallet.

[0015] Preferably, the multi-layer drying production line of the present invention further includes a chain conveyor mechanism disposed on the front or rear side of the drying furnace, the chain conveyor mechanism being parallel to the conveying roller conveyor; an upstream end of the feeding conveyor mechanism is also provided with a feeding chain mechanism, a first feeding turning platform is disposed within the frame of the feeding chain mechanism, and a second feeding turning platform is disposed at one end of the chain conveyor mechanism, the first feeding turning platform being connected to the second feeding turning platform via a feeding connecting roller conveyor; a downstream end of the unloading conveyor mechanism is provided with an unloading chain mechanism, a first unloading turning platform is disposed within the frame of the unloading chain mechanism, and a second unloading turning platform is disposed at the other end of the chain conveyor mechanism, the first unloading turning platform being connected to the second unloading turning platform via a unloading connecting roller conveyor. The beneficial effect is that the present invention installs a chain conveyor mechanism outside the drying furnace, which forms a closed loop with the conveying roller conveyor inside the drying furnace through the turning platforms and connecting roller conveyors at both ends, achieving high-efficiency recycling and reuse of pallets, improving the drying efficiency of workpieces in the production line, and thus improving production efficiency.

[0016] Compared with the prior art, the advantages of the present invention are as follows: This invention installs a pallet stacking device at the inlet of the drying oven, which can stack multiple pallets containing workpieces together from bottom to top. Then, the feeding conveyor sends the multi-layered pallets into the drying oven, and this process is repeated to achieve continuous feeding on the production line. This invention also installs a pallet unpacking device at the outlet of the drying wheel, which can disassemble each stack of pallets from bottom to top, facilitating the unloading of dried workpieces from the pallets and the loading of workpieces to be dried. This cycle enables multi-layer continuous flow drying of workpieces, improving drying efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2This is a schematic diagram of the tray of the present invention (a is the front view, b is the top view).

[0019] Figure 3 This is a schematic diagram of a multi-layered tray in a drying oven.

[0020] Figure 4 This is the front view of the pallet palletizing device.

[0021] Figure 5 This is a schematic diagram of the first pallet lifting mechanism. Figure 1 .

[0022] Figure 6 This is a schematic diagram of the first pallet lifting mechanism. Figure 2 .

[0023] Figure 7 This is a schematic diagram of the first pallet lifting mechanism. Figure 3 .

[0024] Figure 8 This is a schematic diagram of the first pallet lifting mechanism. Figure 4 .

[0025] Figure 9 This is a schematic diagram of the first pallet lifting mechanism and the first pallet supporting mechanism. Figure 1 .

[0026] Figure 10 This is a top view of the first pallet support mechanism.

[0027] Figure 11 This is a side view of the first pallet support mechanism. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0029] It should be noted that, in the description of this invention, relational terms such as “first” and “second” are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] like Figure 1 and Figure 4 As shown, this invention proposes a multi-layer drying production line, including a drying oven 100 with a built-in conveyor roller conveyor (powered roller conveyor), a pallet stacking device located on the inlet side of the drying oven 100, and a pallet unloading device located on the outlet side of the drying oven 100. The pallet stacking device is located outside the drying oven 100 and includes a feeding conveyor mechanism 200 (which can be a chain conveyor or a powered roller conveyor) connected to the input end of the conveyor roller conveyor (i.e., the inlet end of the drying oven 100), a first pallet lifting mechanism 400 located below the feeding conveyor mechanism 200, and a first pallet supporting mechanism 300 located above the feeding conveyor mechanism 200. The supporting component of the first pallet lifting mechanism 400 is located from... The gap in the feeding conveyor 200 extends upwards, lifting the pallet on the feeding conveyor 200 to a certain height, so that the pallet is above the pallet plate 304 of the first pallet support mechanism 300, and the pallet plate 304 of the first pallet support mechanism 300 extends to support the pallet; the first pallet support mechanism 300 descends below the feeding conveyor 200, and lifts the next pallet conveyed to the feeding conveyor 200 upwards to above the pallet plate 304, and the pallet plate 304 extends again to support the pallet, and so on, so that multiple pallets can be stacked together from bottom to top; after each stack of pallets is completed, the feeding conveyor 200 is used to transport it into the drying oven 100, and so on, to achieve multi-layer continuous drying; The pallet unpacking device is located outside the drying oven 100. It includes a feeding conveyor 500 (which can be a chain conveyor or a powered roller conveyor) connected to the output end of the conveyor roller (i.e., the outlet end of the drying oven 100), a second pallet lifting mechanism 600 located below the feeding conveyor 500, and a second pallet supporting mechanism 700 located above the feeding conveyor 500. The supporting component of the second pallet lifting mechanism 600 extends upward through the gap of the feeding conveyor 200 to lift the pallet, so that the second pallet below rises to above the support plate 304 of the second pallet supporting mechanism 700. The support plate 304 of the second pallet supporting mechanism 700 extends to lift the pallets except the bottom one upward. The second pallet lifting mechanism 600 lowers the bottom pallet, so that the pallet falls onto the feeding conveyor 500 and is output through the feeding conveyor 500. This process is repeated to unpack the multi-layer pallets sequentially from bottom to top.

[0032] This invention installs a pallet stacking device at the inlet end of the drying oven 100, which can stack multiple pallets containing workpieces together from bottom to top. Then, the feeding conveyor 200 sends the multi-layered pallets into the drying oven 100, and this process is repeated to realize the feeding of materials on the production line. This invention also installs a pallet unpacking device at the outlet end of the drying wheel, which can disassemble each stack of pallets from bottom to top, facilitating the unloading of dried workpieces and the loading of workpieces to be dried. This cycle enables multi-layer continuous flow drying of workpieces, improves drying efficiency, and also improves the degree of automation to a certain extent, which helps to realize intelligent production.

[0033] Combination Figure 2-3 As can be seen, pallet F includes a horizontally arranged base frame F1 (the base frame has a rectangular structure), a support net F2 set on the base frame F1, and support legs F3 set at each corner of the base frame F1 (i.e., each pallet has four support legs F3). Positioning holes are opened on the bottom surface of each corner of the base frame F1, and each support leg F3 of pallet F has a positioning head F4 on its top that mates with the positioning hole. When pallets are stacked one on top of the other, the positioning heads of the support legs of the lower pallet are inserted into the positioning holes of the upper pallet, ensuring that multiple pallets are stacked neatly, further ensuring the smooth transport of each stack of pallets and improving safety. Of course, in actual installation, the base frame of the pallet can also adopt a grid structure to ensure load-bearing capacity while meeting ventilation requirements.

[0034] In actual installation, the first pallet lifting mechanism 400 and the second pallet lifting mechanism 600 of the present invention have completely identical structures. The present invention will be described in detail using the first pallet lifting mechanism 400 as an example: [In conjunction with...] Figures 5-8 It is understood that the first pallet lifting mechanism 400 includes a base mounting frame 401, a power mechanism, a lifting structure driven by the power mechanism, and a guide structure for guiding and limiting the lifting structure. The power mechanism includes a motor 402a (or, depending on actual needs, an integrated motor + reducer), a primary transmission assembly connected to the motor 402a, and a secondary transmission assembly connected to the primary transmission assembly. The primary transmission assembly includes a pair of drive shafts 402b rotatably mounted on the base mounting frame 401. The two drive shafts 402b are horizontally arranged and mounted on the base mounting frame 401 via bearing seats 402g. Each end of the drive shafts 402b is provided with a secondary transmission assembly (i.e., four sets of secondary transmission assemblies are installed on each of the two drive shafts 402b), so that the lifting structure is balanced by force and ensures stable lifting. During operation, the motor 402a transmits torque to the two drive shafts 402b, and the two drive shafts 402b drive the lifting structure to rise and fall smoothly through the four secondary transmission assemblies.

[0035] Combination Figures 5-8It can be seen that the secondary transmission component is a rocker arm structure, including a rocker arm 402c and a roller 402d. One end of the rocker arm 402c is fixedly connected to the end of the transmission shaft 402b, and the other end of the rocker arm 402c is provided with a mounting shaft. The roller 402d is rotatably connected to the mounting shaft through a bearing. The lifting structure includes a lifting frame provided outside the power mechanism and a support component provided on the lifting frame. The support component is located above the power mechanism. The lifting frame has a pair of vertical mounting plates 403a provided on both sides of the transmission shaft 402b. The vertical mounting plates 403a are perpendicular to the axial direction of the transmission shaft 402b. The lower part of each vertical mounting plate 403a is horizontally provided with a limiting groove 403b perpendicular to the transmission shaft 402b. The roller 402d is located in the corresponding limiting groove 403b. During operation, motor 402a transmits torque to two drive shafts 402b. As the two drive shafts 402b rotate synchronously, they drive four rocker arms 402c to rotate around the drive shafts 402b. Because the rollers 402d at the ends of the rocker arms 402c are located within the limiting grooves 403b, the external force on the rocker arms 402c is decomposed into horizontal and vertical components. The horizontal component promotes the horizontal linear movement of the rollers 402d within the limiting grooves 403b, while the vertical component causes the rocker arms to lift and lower. The frame is raised and lowered; when the rocker arm 402c rotates upward around the drive shaft 402b, the lifting frame rises. When the roller 402d of the rocker arm 402c is at its highest position, the lifting frame is at its highest position, and the supporting component lifts the pallet to the highest position. When the rocker arm 402c rotates downward around the drive shaft 402b, the lifting frame descends. When the rocker arm 402c rotates to its lowest position, the lifting frame is at its lowest position, and at this time the supporting component is located below the feeding conveyor mechanism 200.

[0036] This invention decomposes the circumferential force of the transmission shaft 402b through a rocker arm-type secondary transmission assembly and a horizontally arranged limiting groove 403b. The two transmission shafts 402b are spaced apart, and the four rocker arm-type secondary transmission assemblies are arranged in a rectangular pattern, which significantly improves the stability of the lifting frame and further ensures the smooth lifting of the support assembly. The lifting frame adopts a square frame structure, which has high stability and high strength. As the installation base of the support assembly, it provides reliable support for the support assembly, further improving the stability and load-bearing capacity of this invention.

[0037] Combination Figures 5-8 It is understood that the lifting frame also includes a pair of horizontally arranged reinforcing beams 403c. The reinforcing beams 403c are located outside the crossbeam 401b and are parallel to the drive shaft 402b. The reinforcing beams 403c and the second connecting plate 403d are arranged parallel to each other vertically and at intervals. Both reinforcing beams 403c are connected to the longitudinally arranged vertical mounting plates 403a, which improves the structural strength and stability of the lifting frame and ensures its smooth lifting. During installation, the two ends of each reinforcing beam 403c extend into the limiting grooves 403b on both sides, which can limit the rollers 402d and prevent the rollers 402d from disengaging from the limiting grooves 403b.

[0038] Combination Figures 5-8 As can be seen, the primary transmission assembly includes two chain drive pairs with reduction ratios. The driving gear 402e of the chain drive pair is a small gear, and its driven gear 402f is a large gear. The two driving gears 402e are installed alternately on the motor shaft of the motor 402a (of course, when the reduction of the chain drive pair cannot meet the actual needs, the power source can also be a motor + reducer, and the two driving gears 402e can be installed alternately on the output shaft of the reducer). The two driven gears 402f are respectively installed on the transmission shaft 402b (i.e., one driven gear 402f is installed on each transmission shaft 402b). When the motor is working, the torque is synchronously transmitted to the two transmission shafts 402b through the two chain drive pairs, thereby ensuring the synchronicity of the transmission shafts 402b. This invention uses the motor 402a as the power source, the chain drive pair to transmit torque, and the transmission shaft 402b as the torque output, which can ensure the smooth lifting and lowering of the lifting frame and improve stability. Of course, in actual installation, if the installation space allows, a gear pair with a reduction ratio can also be used to transmit the torque of the motor 402a to the drive shaft 402b. The primary transmission in this embodiment is not limited to a chain drive pair.

[0039] Combination Figures 5-8 As can be seen, the base mounting frame 401 includes a pair of longitudinal beams 401a spaced apart from each other and a pair of transverse beams 401b. The longitudinal beams 401a are parallel to and spaced apart from the limiting grooves 403b, and the transverse beams 401b are parallel to the drive shaft 402b. The direction of the longitudinal beams 401a is perpendicular to the axial direction of the drive shaft 402b. The two transverse beams 401b and the longitudinal beams 401a form a rectangular frame. Each end of the drive shaft 402b is connected to the longitudinal beam 401a located below it through a bearing seat 202g, thereby realizing the installation of the drive shaft 402b. A base mounting plate 401c is fixedly connected between the two longitudinal beams 401a, and the motor 402a is fixedly mounted on the base mounting plate 401c. The invention also includes four foot supports 401d. The base mounting frame 401 is mounted on the foot supports 401d, so that the motor 402a is located at a certain height above the ground to meet the relevant specifications. Both the longitudinal beam 401a and the transverse beam 401b are made of channel steel. Since the two ends of the drive shaft are respectively installed on the longitudinal beam 401a, multiple reinforcing plates 401e are welded at intervals inside the longitudinal beam 401a to improve the structural strength and load-bearing capacity.

[0040] Combination Figures 5-8It is understood that there are two sets of guide structures, with each crossbeam 401b connected to the lifting frame via a set of guide structures to ensure smooth lifting and lowering of the lifting frame. Taking one of the guide structures as an example: the guide structure includes two guide shafts 404a spaced apart on the crossbeam 401b, a linear bearing 404b matching each guide shaft 404a, and a first connecting plate 404c connecting the two linear bearings 404b together; a pair of second connecting plates 403d parallel to the drive shaft 402b are spaced apart between the two vertical mounting plates 403a of the lifting frame, with the second connecting plates 403d located at the ends of the vertical mounting plates 403a. The first connecting plate 404c of each guide structure is fixed to the second connecting plate 403d above it by bolts. When the lifting frame rises or falls, the second connecting plate 403d drives each set of linear bearings 404b to rise and fall through the first connecting plate 404c. The linear bearings 404b and the guide shafts 404a cooperate to prevent the lifting frame from twisting during lifting and lowering, further improving the stability of the lifting frame.

[0041] Combination Figures 5-8 It is understood that there are two sets of support components. Each set of support components includes a vertically installed portal frame 405a and a pair of support plates 405b disposed on both sides of the connecting beam of the portal frame 405a. The two vertical legs of the portal frame 405a are respectively fixedly connected to the vertical mounting plate 403a. The two sets of support components of the present invention are arranged at intervals, and the two sets of support plates 405b support the material or workpiece, so that the material or workpiece is subjected to force balance and the support stability is ensured. In addition, the portal frame structure of the support components ensures that the support plate 304 with the avoidance notch 305 described later can freely extend and retract from under the pallet, meeting the support switching requirements.

[0042] The working process and principle of the first pallet lifting mechanism 400 in this invention are briefly described as follows: When lifting operations are required, the motor 402a is started. The motor 402a drives the two transmission shafts 402b to rotate synchronously through two sets of chain transmission pairs. The transmission shafts 402b drive the two rocker arms 402c connected to them to rotate synchronously. The rollers 402d at the ends of the rocker arms 402c are in the limiting grooves 403b, thereby decomposing the force transmitted by the rocker arms 402c into horizontal and vertical forces, so that the rollers 402d roll linearly in the limiting grooves 403b, and the lifting frame is simultaneously lifted or lowered by the force. Specifically, when the rocker arm 402c rotates from bottom to top, the lifting frame and the supporting assembly rise as a whole. When the rocker arm 402c rotates to its highest position, the supporting assembly is at its highest position, which lifts the pallet to its highest position. When the rocker arm 402c rotates from top to bottom, the lifting frame and the supporting assembly rise as a whole. When the rocker arm 402c rotates to its lowest position, the supporting assembly is at its lowest position (located below the feeding conveyor mechanism 200), ensuring the operation of the unloading conveyor mechanism 500.

[0043] It should be noted that, in this invention, the supporting component of the second pallet lifting mechanism 600 is located below the unloading conveying mechanism 500 when it is at its lowest position, so as to avoid interference between the unloading conveying mechanism 500 and the second pallet lifting mechanism 600 and ensure that they work normally.

[0044] The first pallet lifting mechanism 400 and the second pallet lifting mechanism 600 in this invention have the same structure. Both use a motor 402a as a power source and output power through two transmission shafts 402b. Each transmission shaft 402b has a rocker arm-type secondary transmission assembly installed at both ends, thereby realizing the smooth lifting of the lifting frame and further ensuring the smooth lifting of the support assembly. The lifting frame adopts a square frame structure, which is stable and has high structural strength, providing reliable support for the support assembly.

[0045] In this invention, the first pallet support mechanism 300 and the second pallet support mechanism 700 have identical structures. Taking the first pallet support mechanism 300 installed on the inlet side of the drying oven 100 as an example: [The following is a description of the first pallet support mechanism 300 and its installation on the inlet side of the drying oven 100.] Figures 9-11 It is known that the first pallet support mechanism 300 includes a frame 301 set at the entrance of the drying oven 100 and telescopic mechanisms set on the front and rear sides of the frame 301. The present invention uses the frame as the installation base for the telescopic mechanism to ensure the stability of the telescopic mechanism. Each telescopic mechanism includes a mounting component 302 fixed to the frame 301, a linear power source 303 mounted on the mounting component 302, and a support plate 304. The support plate 304 is slidably mounted on the upper part of the mounting component 302 and is connected to the linear power source 303. Two clearance notches 305 are provided at the supporting end of the support plate 304 to avoid interference with the support plate 405b, allowing the support plate 304 to move under the pallet to lift it and the support plate 405b to descend freely. The two telescopic mechanisms are located on both sides of the frame 301. When the support plates 304 of the two telescopic mechanisms extend simultaneously in opposite directions (i.e., the two support plates 304 extend towards each other, and the distance between them decreases), they can extend under the pallet to support it. When the two support plates 304 move simultaneously in opposite directions (i.e., the support plates retract), the distance between them increases, and the pallet can be released. The support component is a vertically arranged portal frame 405a, which ensures that it can freely pass through the gap between the roller conveyors of the loading and unloading conveyors; the pair of pallet plates 304 of the pallet support mechanism can move towards each other to the bottom of the pallet, ensuring that the pallet support mechanism can support the pallet; the support component and the pallet with the clearance notch 305 together can realize the free switching between the support and support states of the pallet lifting mechanism and the pallet support mechanism, thereby meeting the pallet stacking and unpacking operation requirements.

[0046] Combination Figure 11It can be seen that the top of the mounting component 302 is provided with a sliding rail at intervals, and the bottom of the support plate 304 is provided with a slider to ensure the straight reciprocating motion of the support plate 304 and avoid twisting. In addition, during actual installation, the linear power source 303 is a horizontally positioned hydraulic cylinder or a horizontally positioned pneumatic cylinder, or a motor and a synchronous belt drive connected to the motor, or an eccentric roller connected to the motor drive. Combined with... Figures 9-11 As can be seen, in this embodiment, the linear power source 303 preferably uses a drive motor 303a and an eccentric roller 303b. The drive motor is fixed to the bottom of the mounting component 301. The eccentric roller 303b is eccentrically arranged relative to the motor shaft of the drive motor 303a. The drive part of the pallet has a guide groove 303c that cooperates with the eccentric roller 303b. The length direction of the guide groove 303c is perpendicular to the movement direction of the pallet. The force of the eccentric roller 303b is decomposed by the action of the guide groove 303c and the drive motor 303a, causing it to drive the pallet to extend or retract, so as to meet the support requirements during the pallet stacking and unpacking process.

[0047] During actual installation, the pallet 304 is also equipped with a lateral limiting plate 306 for the pallet. The two pallets 304 are set opposite each other, so that the two limiting plates 306 are arranged opposite each other, which improves the stability of the pallet stacking process.

[0048] In a more preferred embodiment of the present invention, combined with Figure 1 As can be seen, the multi-layer drying production line of the present invention also includes a chain conveyor mechanism M1 disposed outside the drying furnace 100, the chain conveyor mechanism M1 being parallel to the conveying roller conveyor; a feeding chain mechanism M2 is also disposed at the upstream end of the feeding conveyor mechanism 200, the chain conveying direction of the feeding chain mechanism M2 being consistent with the conveying direction of the feeding conveyor mechanism 200; a first feeding turning platform M3 is disposed inside the frame of the feeding chain mechanism M2, and a second feeding turning platform M4 is disposed at one end of the chain conveyor mechanism M1, the first feeding turning platform M3 being connected to the second feeding turning platform M4 via the feeding connecting roller conveyor M5. The first and second feeding turning platforms M3 and M4 are connected by a roller lifting platform (the lifting system can be a scissor-type hydraulic lifting system) with the same conveying direction. The first and second feeding turning platforms M3 and M4 are connected by a feeding connecting roller conveyor M5. The conveying direction of the feeding connecting roller conveyor M5 is the same as that of the first feeding turning platform M3, so that the pallet on the chain conveyor mechanism M1 enters the feeding conveyor mechanism 200 successively through the second feeding turning platform M4, the feeding connecting roller conveyor M5, the first feeding turning platform M3 and the feeding chain mechanism M2. Similarly, a feeding chain mechanism M6 is provided at the downstream end of the feeding conveyor mechanism 500. A first feeding turning platform M7 is provided inside the frame of the feeding chain mechanism M6. A second feeding turning platform M8 is provided at the other end of the chain conveyor mechanism M1. The first feeding turning platform M7 is connected to the second feeding turning platform M8 through the feeding connecting roller conveyor M9. The first unloading turning platform M7 and the second unloading turning platform M8 are both roller-type lifting platforms (the lifting system can be a scissor-type hydraulic lifting system) with the same conveying direction. The first unloading turning platform M7 and the second unloading turning platform M8 are connected by the unloading connecting roller conveyor M9. The conveying direction of the unloading connecting roller conveyor M9 is the same as that of the first unloading turning platform M7. This allows the pallets coming out of the drying oven 100 to pass through the first unloading turning platform M7, the unloading chain mechanism M6, the unloading connecting roller conveyor M9, and the second unloading turning platform M8 before entering the chain conveyor mechanism M1. This allows the chain conveyor mechanism M1 and the drying oven 100 to form a closed loop, realizing the assembly line circulation of pallets and improving production efficiency.

[0049] In actual installation, both the unloading connecting roller conveyor M9 and the loading connecting roller conveyor M5 are powered roller conveyors, and both the unloading chain mechanism M6 and the loading chain mechanism M2 are chain conveying mechanisms, i.e., chain conveying of pallets. It should also be noted that, to ensure automatic pallet stacking and unpacking operations, the height of a single pallet (when not being lifted) on the loading conveyor mechanism 200 is lower than the height of the two pallets 304 of the first pallet support mechanism 300; similarly, the height of a single pallet on the unloading conveyor mechanism 500, when not being lifted, is lower than the height of the two pallets 304 of the second pallet support mechanism 700.

[0050] In this embodiment, unloading and loading stations can be arranged at intervals on the chain conveyor M1. At the unloading station, the dried workpieces are removed from the tray, and at the loading station, the workpieces to be dried are placed in the tray. The chain conveyor M1 transports the tray containing the workpieces to the second loading turning platform M4 at its rightmost end. The second loading turning platform M4 rises to lift the tray to a certain height and transports it to the loading connecting roller conveyor M5. The first loading turning platform M3 rises to the same conveying height as the loading connecting roller conveyor M5 and receives the tray on the loading connecting roller conveyor M5. The first loading turning platform M3 descends to place the tray on the loading chain mechanism M2, and the loading chain mechanism M2 transports the tray to the loading conveyor 200. When a pallet arrives at the feeding conveyor 200, the pair of supporting components of the first pallet lifting mechanism 400 lift the pallet upwards to above the height of the pallet plate 304. The pair of pallet plates 304 of the first pallet supporting mechanism 300 extend relative to each other to the bottom of the pallet. The supporting components of the first pallet lifting mechanism 400 descend below the feeding conveyor 200, awaiting the next pallet. The first pallet supporting mechanism 300 supports the pallet. When the second pallet moves to the feeding conveyor 200, the first pallet lifting mechanism 400 lifts the second pallet upwards to a certain height. The clearance gap 305 allows the support plate 405b to rise freely, enabling the second pallet and the upper pallet to rise synchronously. The first pallet support mechanism 300's plate 304 retracts, and the first pallet lifting mechanism 400 continues to rise until the bottom of the lower pallet is higher than the plate 304. Then, the plate 304 extends, and the first pallet lifting mechanism 400 resets. This process is repeated to achieve pallet stacking. After stacking, the unloading conveyor mechanism 500 transports the stack of pallets into the drying oven 100. This process is repeated to achieve multi-layer continuous drying operation. After drying, each set of pallets moves from the outlet of the drying oven 100 to the unloading conveyor mechanism 500. A pair of pallet plates 304 of the second pallet supporting mechanism 700 extend to support the other pallets except the bottom one. The unloading conveyor mechanism 500 conveys the bottom pallet to the unloading chain mechanism M6, and then to the first unloading turning platform M7. The first unloading turning platform M7 rises to a certain height and conveys the pallet to the unloading connecting roller conveyor M9. The second unloading turning platform M8 rises to a certain height and connects with the unloading connecting roller conveyor M9, so that the pallet moves to the second unloading turning platform M8. The second unloading turning platform M8 drives the pallet to descend so that the pallet is located on the conveying chain of the chain conveyor mechanism M1. The dried workpiece is taken out at the unloading station, and the workpiece to be dried is put into the pallet at the loading station. This cycle is repeated to achieve continuous drying operation. During the unpacking process, after the bottom pallet is removed, the supporting components of the second pallet lifting mechanism 600 rise and lift the supporting pallets (multiple pallets) upwards, making the height of the bottom pallet higher than the pair of pallet plates 304 of the second pallet supporting mechanism 700, allowing the pair of pallet plates 304 of the second pallet supporting mechanism 700 to retract smoothly. After the second pallet supporting mechanism 700 retracts, the second pallet lifting mechanism 600 drives multiple pallets to descend as a whole until the bottom pallet is completely lowered onto the unloading conveyor mechanism 500. At this time, the pallet plates 304 of the second pallet supporting mechanism 700 extend to support the other pallets except the bottom pallet. This process is repeated to achieve automatic unpacking of each stack of pallets. In this invention, the pallet movement path is a closed loop, realizing the recycling and reuse of pallets.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layer drying production line, comprising a drying oven with a built-in conveyor roller conveyor, characterized in that: It also includes a pallet stacking device and a pallet unloading device. The pallet stacking device is located on the inlet side of the drying oven and includes a feeding conveyor mechanism connected to the input end of the conveyor roller conveyor, a first pallet lifting mechanism located below the feeding conveyor mechanism, and a first pallet supporting mechanism located above the feeding conveyor mechanism. The supporting component of the first pallet lifting mechanism extends upward through the gap in the feeding conveyor mechanism, lifting the pallets on the feeding conveyor mechanism to the first pallet supporting mechanism. A pair of pallet plates of the first pallet supporting mechanism extend out to support the pallets, and multiple pallets are stacked sequentially on the first pallet supporting mechanism from bottom to top. The pallet unloading device... The tray device is located on the outlet side of the drying oven and includes a feeding conveyor connected to the output end of the conveyor roller, a second tray lifting mechanism located below the feeding conveyor, and a second tray support mechanism located above the feeding conveyor. The support component of the second tray lifting mechanism extends upward through the gap of the feeding conveyor and lifts multiple trays, so that the second tray from bottom to top rises to the second tray support mechanism. The second tray support mechanism lifts the second tray below, and the second tray lifting mechanism drives the lowest tray to descend onto the feeding conveyor, so that multiple trays are disassembled onto the feeding conveyor in sequence from bottom to top.

2. The multi-layer drying production line according to claim 1, characterized in that: The pallet includes a horizontally arranged base frame, a support net arranged on the base frame, and support legs arranged at each corner of the base frame. A positioning hole is provided on the bottom surface of each corner of the base frame, and a positioning head that mates with the positioning hole is provided on the top of each pallet, so that multiple pallets can be inserted sequentially from bottom to top through the positioning hole and the positioning head.

3. The multi-layer drying production line according to claim 1, characterized in that: The first pallet lifting mechanism and the second pallet lifting mechanism have the same structure. The first pallet lifting mechanism includes a base mounting frame, a power mechanism, a lifting structure driven by the power mechanism, and a guide structure for guiding and limiting the lifting structure. The power mechanism includes a motor, a primary transmission assembly connected to the motor, and a secondary transmission assembly connected to the primary transmission assembly. The primary transmission assembly includes a pair of transmission shafts rotatably mounted on the base mounting frame, and the two transmission shafts are horizontally arranged above the base mounting frame. Each end of the drive shaft is provided with a secondary transmission assembly, which is a rocker arm type structure, including a rocker arm with one end set on the drive shaft and a roller set at the other end of the rocker arm, and the roller is rotatably connected to the mounting shaft at the end of the rocker arm; the lifting structure is a lifting frame set outside the power mechanism, and the supporting assembly is set on the lifting frame and located above the power mechanism; The lifting frame has a pair of vertical mounting plates arranged on both sides of the drive shaft. Each vertical mounting plate has a horizontally arranged limit groove at its lower part. The length direction of the limit groove is perpendicular to the drive shaft, and the roller of the secondary transmission component is located in the corresponding limit groove.

4. The multi-layer drying production line according to claim 3, characterized in that: The primary transmission assembly includes two chain drive pairs with reduction ratios. The driving gear of each chain drive pair is mounted on the motor shaft of the motor, and the driven gears of the two chain drive pairs are correspondingly mounted on the two transmission shafts. The motor transmits torque synchronously to the two transmission shafts through the two chain drive pairs.

5. The multi-layer drying production line according to claim 3, characterized in that: The bottom mounting frame includes a pair of longitudinal beams spaced apart to the left and right and a pair of transverse beams. The longitudinal beams are parallel to and spaced apart from the limiting grooves. The end of the drive shaft is rotatably mounted on the longitudinal beams via bearing seats. The transverse beams are parallel to the drive shafts and located outside the drive shafts. The guide structure consists of two sets. Each transverse beam is connected to the lifting frame via a set of guide structures. The guide structure includes at least two guide shafts spaced apart on the transverse beams, a linear bearing matching each guide shaft, and a first connecting plate connecting the at least two linear bearings together. The lifting frame also includes a pair of second connecting plates connecting the two vertical mounting plates. The bottom flange of each second connecting plate is fixedly connected to the corresponding first connecting plate. The lifting frame also includes a pair of horizontally arranged reinforcing beams located outside the transverse beams. The two ends of each reinforcing beam are fixedly connected to the two limiting grooves respectively.

6. The multi-layer drying production line according to claim 3, characterized in that: The supporting components are in two sets. Each set of supporting components includes a portal frame and supporting plates on both sides of the connecting beam of the portal frame. The two vertical legs of the portal frame are respectively fixed to the vertical mounting plate.

7. The multi-layer drying production line according to claim 6, characterized in that: The first pallet support mechanism and the second pallet support mechanism have the same structure. The first pallet support mechanism includes a frame located at the entrance of the drying oven and telescopic mechanisms located on the front and rear sides of the frame. Each telescopic mechanism includes a mounting component fixed to the frame, a linear power source located on the mounting component, and a pallet plate. The pallet plate is slidably located on the upper part of the mounting component and is connected to the linear power source. The supporting end of the pallet plate has a clearance notch to avoid the supporting pallet plate. The two telescopic mechanisms are arranged opposite to each other, and the pallets of the two telescopic mechanisms extend in opposite directions at the same time to support the pallet.

8. The multi-layer drying production line according to claim 7, characterized in that: The linear power source is a horizontally arranged hydraulic cylinder or a horizontally arranged pneumatic cylinder, or a motor and a synchronous belt drive pair connected to the motor, or a motor and an eccentric roller connected to the motor; the top of the mounting component is provided with slide rails at intervals, and the bottom of the support plate is provided with sliders.

9. The multi-layer drying production line according to claim 1, characterized in that: It also includes a chain conveyor mechanism disposed on the front or rear side of the drying oven, the chain conveyor mechanism being parallel to the conveying roller conveyor; an upstream end of the feeding conveyor mechanism is also provided with a feeding chain mechanism, a first feeding turning platform is disposed within the frame of the feeding chain mechanism, a second feeding turning platform is disposed at one end of the chain conveyor mechanism, the first feeding turning platform being connected to the second feeding turning platform via a feeding connecting roller conveyor; a downstream end of the unloading conveyor mechanism is provided with an unloading chain mechanism, a first unloading turning platform is disposed within the frame of the unloading chain mechanism, a second unloading turning platform is disposed at the other end of the chain conveyor mechanism, the first unloading turning platform being connected to the second unloading turning platform via a unloading connecting roller conveyor.

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