An automatic unloading device for a power-and-free chain conveyor system

Abstract

The present invention relates to the field of material conveying technology, specifically an automatic unloading device for an accumulation chain conveying system, including a guide rail, a pallet assembly, a transmission chain and an automatic clamp, there are multiple pallet assemblies, multiple pallet assemblies are slidably arranged on the guide rail, the transmission chain is arranged on the guide rail, the transmission chain can rotate circumferentially around the guide rail, and the pallet assembly and the transmission chain have a first matching form and a second matching form. The present invention provides a pallet assembly, the pallet assembly includes a frame, a side rod, a roller and a replacement unit, the present invention provides a pallet assembly, the pallet assembly includes a frame, a side rod, a roller and a replacement unit, after the pallet assembly moves to the accumulation interval, the rollers on the side rods are replaced by the replacement unit, thereby optimizing the equipment structure, balancing the load force borne by the frame, and preventing the difference in the degree of wear of the rollers on the left and right sides of the frame from becoming larger, so as to extend the service life of the pallet assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and in particular to an automatic unloading device for a stacking and releasing chain conveying system. Background Art

[0002] The accumulation chain conveyor system is a special material handling equipment that combines chain drive and cargo accumulation functions. It can temporarily store or buffer products without affecting subsequent workstations. The main parts of the accumulation chain conveyor system include chains, pallets, guide rails, drive devices, control systems and accumulation systems. The chain is responsible for transmitting power and supporting the load unit. It is usually made of high-strength alloy steel with good wear resistance and fatigue resistance. The pallet is responsible for transporting materials, and the guide rail is used to guide the chain and pallet along the predetermined path to ensure a smooth and reliable material transportation process. The drive device provides power for the entire system. The control system is used to monitor and manage the operating status of the system, such as speed regulation and fault diagnosis. The accumulation system is used to flexibly adjust the working mode of each section according to the actual working conditions to achieve effective accumulation and release of materials.

[0003] The pallet trolley consists of a trolley and an automatic gripper. The trolley's rollers engage the guide rails, and the trolley, carrying the automatic gripper, moves along the rail's pre-set trajectory. Because the material gripped by the automatic gripper may be irregularly shaped (i.e., with a center of gravity not located at the geometric center or with a non-symmetrical geometry), the left and right sides of the trolley experience uneven loads. This imbalance persists throughout a program cycle, leading to increasing wear differences between the left and right rollers, thus reducing the trolley's service life. Summary of the Invention

[0004] Based on this, it is necessary to address the problems existing in the current material handling equipment and provide an automatic unloading device for the accumulation chain conveyor system to solve the problem that when the pallet clamps the special-shaped materials through the automatic gripper, the loads on the rollers on the left and right sides of the trolley are different, resulting in an increasingly large difference in the degree of wear of the rollers on the left and right sides of the trolley.

[0005] The above purpose is achieved through the following technical solutions:

[0006] An automatic unloading device for a power-and-free chain conveyor system comprises:

[0007] guide;

[0008] Tray assembly, there are multiple tray assemblies, and the multiple tray assemblies are slidably arranged on the guide rail;

[0009] A transmission chain is provided on the guide rail, and the transmission chain can rotate circumferentially around the guide rail, and the tray assembly and the transmission chain have a first cooperation form and a second cooperation form. In the first cooperation form, the tray assembly and the transmission chain rotate synchronously, and in the second cooperation form, the tray assembly and the transmission chain rotate relative to each other;

[0010] There are multiple automatic grippers, and the multiple automatic grippers are connected to the multiple tray assemblies in a one-to-one correspondence;

[0011] The tray assembly includes a frame, a trolley chain, a trolley sprocket, a center sprocket, a side rod, a roller and a replacement unit. The trolley sprockets are four and divided into two groups, with two in each group. The two groups of trolley sprockets are spaced front and back and rotatably arranged on the frame. The two trolley sprockets in each group are spaced left and right and coaxially arranged. There are two trolley chains. The two trolley chains are transmission-connected to the two groups of trolley sprockets. The center sprocket is located between the two trolley sprockets spaced left and right and is coaxially arranged with the trolley sprocket. The center sprocket is transmission-connected to the transmission chain, and the center sprocket can rotate around its axis. There are multiple side rods, and the multiple side rods are divided into two groups. The two groups of side rods are spaced left and right, and the multiple side rods in each group are equally spaced inside the trolley chain on the corresponding side. There are multiple rollers and divided into multiple groups. The multiple groups of rollers are alternately left and right and rotatably arranged outside the side rods on the corresponding side. The rollers are in rolling contact with the guide rails. The replacement unit is provided on the frame, and the replacement unit is used to exchange positions of the multiple groups of rollers between the corresponding left and right groups of side rods.

[0012] In one embodiment, the exchange unit includes an intermediate rod, a sliding block, a first electric telescopic rod, a double-headed electric telescopic rod, a toggle block and an electromagnetic block, the sliding block is slidably connected to the frame, and the sliding block can slide linearly in the front-to-back direction, there are two electromagnetic blocks, and the two electromagnetic blocks are arranged at intervals on the upper part of the sliding block in the front-to-back direction, the first electric telescopic rod can rotate around its axis, the first electric telescopic rod is rotatably arranged on the upper part of the sliding block, and the axis of the first electric telescopic rod passes through the center point of the line connecting the two electromagnetic blocks in the front-to-back direction, and the first electric telescopic rod can rotate around its axis, the axis of the double-headed electric telescopic rod is perpendicular to the axis of the first electric telescopic rod, and the center point of the double-headed electric telescopic rod is located on the axis of the first electric telescopic rod, and there are two toggle blocks and are respectively arranged at both ends of the double-headed electric telescopic rod;

[0013] A slot is provided at the upper end of the electromagnetic block, and the middle rod is movably placed in the slot;

[0014] When the axis of the middle rod coincides with the axis of the side rod in the left-right direction and the electromagnetic block is de-energized, the middle rod can be moved out of the slot and coaxially abut against the left and right side rods;

[0015] When the axis of the middle rod coincides with the axis of the side rod in the left-right direction and the electromagnetic block is energized, the middle rod can be reset and moved into the slot.

[0016] In one embodiment, the end surface of the side rod away from the trolley chain is an elliptical surface, and the axis of the elliptical surface is inclined downward;

[0017] The end faces at both ends of the middle rod are also elliptical surfaces, and the end faces at both ends of the middle rod can be in surface contact with the end face of the side rod away from the trolley chain.

[0018] In one embodiment, an annular groove is provided on the outer peripheral surface of the roller;

[0019] The end of the toggle block is provided with a toggle protrusion, which is matched with the annular groove.

[0020] In one embodiment, the exchange unit also includes a first motor, a driving screw and a guide rod, the first motor is arranged on the frame, the output end of the first motor is fixedly connected to the driving screw, the driving screw is threadedly connected to the sliding block, and the axis of the driving screw extends in the front-to-back direction, the two ends of the guide rod are connected to the frame, and the guide rod is slidably connected to the sliding block, and the axis of the guide rod is parallel to the axis of the driving screw.

[0021] In one embodiment, a trigger is provided at the rear end of the frame;

[0022] The tray assembly also includes a brake unit, which is arranged in the frame and cooperates with the central sprocket. The brake unit is also connected to the trigger signal;

[0023] The brake unit is configured to restrict the central sprocket from rotating about its own axis when the trigger is not triggered;

[0024] The brake unit is further configured to remove the restriction on the central sprocket from rotating around its own axis when the trigger is triggered.

[0025] In one embodiment, an automatic unloading device for a stacking chain conveying system also includes a driving sprocket and a driven sprocket. The driving sprocket and the driven sprocket have the same diameter and are spaced apart from each other. The driving sprocket can rotate around its own axis. Both the driving sprocket and the driven sprocket are connected to the transmission chain.

[0026] In one embodiment, the front and rear ends of the frame are further provided with arc-shaped plates, and the diameter of the arc-shaped plates is adapted to the diameter of the driving sprocket.

[0027] In one embodiment, a first magnet is embedded at both ends of the middle rod, and a second magnet is embedded at one end of the side rod away from the frame;

[0028] The magnetic properties of the sides of the first magnet and the second magnet facing each other are opposite.

[0029] In one embodiment, a plurality of rigid support frames are provided on the inner side of the guide rail, and the plurality of rigid support frames are arranged at intervals along the length direction of the guide rail.

[0030] The beneficial effects of the present invention are:

[0031] The present invention is provided with a pallet assembly, which includes a frame, side rods, rollers and a replacement unit. After the pallet assembly moves to the accumulation area, the rollers on the side rods are replaced by the replacement unit, thereby optimizing the equipment structure and balancing the load force borne by the frame, which is beneficial to preventing the wear degree difference of the rollers on the left and right sides of the frame from becoming larger, so as to extend the service life of the pallet assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an overall schematic diagram of an automatic unloading device for a power-and-free chain conveying system according to the present invention;

[0033] Figure 2 This is a structural schematic diagram of a pallet assembly in an automatic unloading device for a power-and-free chain conveyor system according to the present invention;

[0034] Figure 3 This is a schematic diagram of the installation and coordination of side rods and rollers in an automatic unloading device for a power-and-free chain conveying system according to the present invention;

[0035] Figure 4 This is a schematic diagram of the cooperation between rollers and guide rails in an automatic unloading device for a power-and-free chain conveying system according to the present invention;

[0036] Figure 5 This is a schematic structural diagram of a replacement unit in an automatic unloading device for a power-and-free chain conveying system according to the present invention;

[0037] Figure 6 This is a schematic diagram of a first state of a double-headed electric telescopic rod of an automatic unloading device for a power-and-free chain conveyor system according to the present invention;

[0038] Figure 7 This is a schematic diagram of a second working state of a double-headed electric telescopic rod in an automatic unloading device for a power-and-free chain conveying system according to the present invention.

[0039] in:

[0040] 100, guide rail; 110, rigid support frame;

[0041] 200, tray assembly; 210, frame; 220, trolley chain; 230, trolley sprocket; 240, center sprocket; 250, side rod; 260, roller; 261, annular groove;

[0042] 270, exchange unit; 271, intermediate rod; 272, sliding block; 273, first electric telescopic rod; 274, double-ended electric telescopic rod; 275, toggle block; 2751, toggle protrusion; 276, electromagnetic block; 2761, slot; 277, first motor; 278, drive screw; 279, guide rod;

[0043] 280, trigger;

[0044] 290, curved plate;

[0045] 300, transmission chain; 310, driving sprocket; 320, driven sprocket;

[0046] 400. Automatic gripper. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0049] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] like Figure 1-Figure 7As shown, an automatic unloading device for a stacking chain conveying system includes a guide rail 100, a tray assembly 200, a transmission chain 300 and an automatic clamp 400. There are multiple tray assemblies 200, and the multiple tray assemblies 200 are slidably arranged on the guide rail 100. The transmission chain 300 is transmission-arranged on the guide rail 100. The transmission chain 300 can rotate circumferentially around the guide rail 100, and the tray assembly 200 and the transmission chain 300 have a first matching form and a second matching form. In the first matching form, the tray assembly 200 and the transmission chain 300 are in a first matching form. The strip 300 rotates synchronously. In the second cooperation form, the tray assembly 200 rotates relative to the transmission chain 300. There are multiple automatic grippers 400, and the multiple automatic grippers 400 are connected to the multiple tray assemblies 200 in a one-to-one correspondence. The tray assembly 200 includes a frame 210, a trolley chain 220, a trolley sprocket 230, a center sprocket 240, a side rod 250, a roller 260 and a replacement unit 270. There are four trolley sprockets 230 and they are divided into two groups, each group has two, and the two groups of trolley sprockets 230 are spaced front and back and rotated. On the vehicle frame 210, the two trolley sprockets 230 of each group are spaced apart and coaxially arranged. There are two trolley chains 220, and the two trolley chains 220 are transmission-connected to the two groups of trolley sprockets 230. The center sprocket 240 is located between the two trolley sprockets 230 spaced apart on the left and right sides and the center sprocket 240 is coaxially arranged with the trolley sprocket 230. The center sprocket 240 is transmission-connected to the transmission chain 300, and the center sprocket 240 can rotate around its axis. There are multiple side rods 250, and the multiple side rods 250 are divided into two groups. The two groups of side rods 250 on the left and right sides are connected. Right interval, multiple side rods 250 of each group are evenly spaced and arranged on the inner side of the trolley chain 220 on the corresponding side, there are multiple rollers 260 and they are divided into multiple groups, and multiple groups of rollers 260 are alternately and rotated left and right and are arranged on the outside of the side rod 250 on the corresponding side, and the rollers 260 are in rolling contact with the guide rail 100, and the exchange unit 270 is provided on the frame 210. When the tray assembly 200 and the transmission chain 300 are in the second matching form, the exchange unit 270 is used to exchange the positions of the multiple groups of rollers 260 between the left and right groups of side rods 250 corresponding to them.

[0051] Before the pallet assembly 200 moves to the accumulation interval, the pallet assembly 200 and the transmission chain 300 are in the first cooperation form. At this time, the pallet assembly 200 and the transmission chain 300 rotate synchronously. Under the transmission action of the transmission chain 300, the automatic clamp 400 clamps the material in the loading interval and then follows the pallet assembly 200 to move synchronously to the accumulation interval. After the pallet assembly 200 moves to the accumulation interval, the cooperation form of the pallet assembly 200 and the transmission chain 300 is switched to the second cooperation form. At this time, the pallet assembly 200 and the transmission chain 300 rotate relative to each other, that is, the transmission cooperation between the pallet assembly 200 and the transmission chain 300 is disengaged, and the pallet assembly 200 temporarily stays in the accumulation interval, and the transmission chain 300 continues to transmit circumferentially.

[0052] After the tray assembly 200 and the transmission chain 300 are in the second matching form, the exchange unit 270 is used to exchange the positions of multiple rollers 260 between the corresponding left and right groups of side rods 250, so that the rollers 260 rotatably connected on the left side rod 250 are exchanged to the right side rod 250 through the exchange unit 270, and the rollers 260 rotatably connected on the right side rod 250 are exchanged to the left side rod 250 through the exchange unit 270, so that the installation positions of the rollers 260 are exchanged between the left and right sides of the frame 210. During the operation of the accumulation chain conveyor system, whenever the pallet assembly 200 moves to the accumulation area, the exchange unit 270 exchanges the left and right positions of the rollers 260 installed on its side rods 250, thereby preventing the difference in the degree of wear of the rollers 260 on the left and right sides of the frame 210 from becoming larger. Therefore, the equipment structure is optimized and the load force borne by the frame 210 is balanced, so as to extend the service life of the pallet assembly 200.

[0053] When the time that the pallet assembly 200 stays in the accumulation interval reaches the set time length of the accumulation program, the pallet assembly 200 and the transmission chain 300 switch to the first cooperation form. At this time, the transmission chain 300 continues to drive the pallet assembly 200 to transmit circumferentially. Under the transmission action of the transmission chain 300, the automatic gripper 400 follows the pallet assembly 200 to move synchronously from the accumulation interval to the unloading interval. After the automatic gripper 400 arrives at the unloading interval, the automatic gripper 400 automatically places the clamped material in the designated position. Then, under the transmission action of the transmission chain 300, the automatic gripper 400 follows the pallet assembly 200 to continue moving to the loading interval. After arriving at the loading interval, the automatic gripper 400 clamps the material again. This cycle is repeated, and the material in the loading interval is transported to the unloading interval through the accumulation chain conveying system.

[0054] In a further embodiment, Figure 3-Figure 7As shown, the exchange unit 270 includes an intermediate rod 271, a sliding block 272, a first electric telescopic rod 273, a double-headed electric telescopic rod 274, a toggle block 275 and an electromagnetic block 276. The sliding block 272 is slidably connected to the frame 210, and the sliding block 272 can slide linearly in the front-to-back direction. There are two electromagnetic blocks 276, and the two electromagnetic blocks 276 are spaced apart in the front-to-back direction on the upper part of the sliding block 272. The first electric telescopic rod 273 can rotate around its axis. The first electric telescopic rod 273 is rotatably set on the upper part of the sliding block 272 and the axis of the first electric telescopic rod 273 passes through the center point of the line connecting the two electromagnetic blocks 276 in the front-to-back direction. The axis of the double-headed electric telescopic rod 274 is perpendicular to the first electric telescopic rod. The axis of the rod 273, and the center point of the double-headed electric telescopic rod 274 is located on the axis of the first electric telescopic rod 273, there are two toggle blocks 275 and they are respectively arranged at both ends of the double-headed electric telescopic rod 274, and a slot 2761 is opened at the upper end of the electromagnetic block 276, and the middle rod 271 is movably placed in the slot 2761. When the electromagnetic block 276 is not energized and the axis of the middle rod 271 coincides with the axis of the side rod 250 in the left and right directions, the middle rod 271 can be moved out of the slot 2761 and coaxially abut against the left and right side rods 250. When the electromagnetic block 276 is energized and the axis of the middle rod 271 coincides with the axis of the side rod 250 in the left and right directions, the middle rod 271 can be reset and moved into the slot 2761.

[0055] It should also be noted that a trigger 280 is provided at the rear end of the frame 210, and the tray assembly 200 also includes a braking unit, which is provided in the frame 210 and cooperates with the center sprocket 240. The braking unit is also connected to the trigger 280 by signal. The braking unit is configured to limit the center sprocket 240 from rotating around its own axis when the trigger 280 is not triggered. The braking unit is also configured to cancel the restriction on the center sprocket 240 from rotating around its own axis when the trigger 280 is triggered.

[0056] In the second cooperation form, in order to enable relative rotation between the transmission chain 300 and the pallet assembly 200, specifically, after the current pallet assembly 200 moves to the accumulation interval and the current pallet assembly 200 abuts against the trigger 280 of the pallet assembly 200 adjacent to and located in front of it, the trigger 280 corresponding to the pallet assembly 200 in front of it is triggered, and the braking unit of the current pallet assembly 200 cancels the restriction on the movement of the center sprocket 240 around its own axis after receiving the electrical signal. At this time, relative rotation is achieved between the transmission chain 300 and the pallet assembly 200, and the pallet assembly 200 no longer rotates synchronously with the transmission chain 300.

[0057] In the second matching form, under the transmission action of the transmission chain 300, the center sprocket 240 rotates around its own axis, and the center sprocket 240 drives the trolley sprocket 230 arranged coaxially therewith to rotate synchronously. The trolley sprocket 230 drives the trolley chain 220 to transmit circumferentially. The side rod 250 is arranged on the inner side of the trolley chain 220, so the side rod 250 rotates synchronously with the trolley chain 220. When the trolley chain 220 rotates until the axis of the side rod 250 coincides with the axis of the intermediate rod 271 in the left and right directions, the electromagnetic block 276 takes When the power is turned off, the magnetic attraction force of the electromagnetic block 276 on the middle rod 271 disappears, and the two middle rods 271 are simultaneously moved out of the slots 2761 and coaxially abutted with the corresponding left and right side rods 250. Since the side rods 250 and the middle rods 271 have the same diameter, the side rods 250 can use the middle rods 271 as a "bridge" to exchange positions between the corresponding left and right side rods 250. Specifically, at this time, the sliding block 272 moves from front to back, so that the moving linear speed of the sliding block 272 adapts to the speed of the transmission chain 300. The linear speed of movement is adjusted so that the sliding block 272 and the middle rod 271 and the side rod 250 connected coaxially remain relatively stationary. At the same time, the telescopic end of the first electric telescopic rod 273 extends outward and the first electric telescopic rod 273 rotates around its axis so that the toggle block 275 abuts against the roller 260. After the toggle block 275 abuts against the roller 260, the first electric telescopic rod 273 stops extending and continues to rotate. Next, the telescopic end of the double-headed electric telescopic rod 274 shortens and then extends adaptively. At this time, the left side The roller 260 on the rod 250 is subjected to the pushing force from the toggle block 275 and moves along the axis of the side rod 250 with the middle rod 271 as a "bridge" from the current left side rod 250 to the coaxial right side rod 250. At the same time, the roller 260 on the right side rod 250 is subjected to the pushing force from the toggle block 275 and moves along the axis of the side rod 250 with the middle rod 271 as a "bridge" from the current right side rod 250 to the coaxial left side rod 250, so that the position of the roller 260 can be swapped.

[0058] After the position exchange of the current roller 260 is completed, the electromagnetic block 276 is energized. Under the magnetic action of the electromagnetic block 276, the two intermediate rods 271 are simultaneously reset and moved into the locking groove 2761. Then the sliding block 272 is reset, and the first electric telescopic rod 273 and the double-headed electric telescopic rod 274 are also reset. When the intermediate rod 271 coincides with the axis of the other side rod 250 in the left-right direction again (at this time, the side rod 250 opposite to the previous installation position of the roller 260 should be selected), the telescopic end of the first electric telescopic rod 273 is extended outward and the first electric telescopic rod 273 rotates in the opposite direction about its axis so that the toggle block 275 contacts the roller 260 on the left. After the toggle block 275 contacts the roller 260, the first electric telescopic rod 273 stops extending and continues to rotate in the opposite direction. Then the telescopic end of the double-headed electric telescopic rod 274 is retracted to exchange the position of the roller 260 left and right. The above-mentioned procedure is then repeated so that the positions of all the rollers 260 are switched left and right.

[0059] In the initial state, the axis of the double-headed electric telescopic rod 274 remains vertical and is at the maximum extended length.

[0060] It should also be noted that to allow the intermediate rod 271 to be removed from the slot 2761 and coaxially abut the side rod 250, first magnets are embedded at both ends of the intermediate rod 271, and a second magnet is embedded at the end of the side rod 250 away from the vehicle frame 210. The first and second magnets have opposite magnetic properties on the sides facing each other. When the electromagnetic block 276 is de-energized, the electromagnetic block 276 loses its magnetic attraction to the intermediate rod 271. At this point, the magnetic attraction of the second magnet in the side rod 250 causes the intermediate rod 271 to be coaxially connected to the side rod 250, allowing the roller 260 to swap positions between the left and right side rods 250, using the intermediate rod 271 as a "bridge."

[0061] It should also be noted that the end surface of the side rod 250 away from the trolley chain 220 is an elliptical surface, with the axis of the elliptical surface tilted downward. The end surfaces of the intermediate rod 271 are also elliptical surfaces, and the end surfaces of the intermediate rod 271 can contact the end surface of the side rod 250 away from the trolley chain 220. This arrangement is to use the elliptical surfaces for guiding and centering. Even if the intermediate rod 271 moves slightly along its axis, the intermediate rod 271 and the two side rods 250 can still be connected as a whole, allowing the roller 260 to swap positions between the left and right side rods 250, using the intermediate rod 271 as a "bridge."

[0062] It should also be noted that in order to enable the first electric telescopic rod 273 to rotate around its axis, specifically, a gear ring (not shown in the figure) can be coaxially sleeved on the outside of the first electric telescopic rod 273, and a drive motor (not shown in the figure) is provided on the upper part of the sliding block 272, so that the output end of the drive motor is fixedly connected to a gear (not shown in the figure), and the gear is engaged with the gear ring, so that the rotation of the drive motor drives the gear ring to rotate, and the gear ring drives the fixed end of the first electric telescopic rod 273 to rotate, so that the first electric telescopic rod 273 rotates around its own axis.

[0063] It can be understood that by providing the roller 260 instead of the walking wheel in the prior art, when the pallet assembly 200 is stationary (for example, when the pallet assembly 200 enters the accumulation interval), the circumferential transmission of the transmission chain 300 drives the roller 260 to rotate and follow the trolley chain 220 to revolve, which can effectively solve the problem of the large resistance of the pallet assembly 200 when the automatic gripper 400 is restarted when the load is large, thereby improving the smoothness of the operation of the pallet assembly 200.

[0064] In a further embodiment, the number of the side rods 250 in each group is two, and correspondingly, the number of the rollers 260 in each group is also two.

[0065] The advantage of such a setting is that, by making the reset linear velocity value of the sliding block 272 twice the rotation linear velocity value of the transmission chain 300, after the sliding block 272 is reset, the intermediate rod 271 can coincide with the axis of the other side rods 250 in the left and right directions again, and the position of the roller 260 on the side rod 250 at this time is exactly opposite to the position of the roller 260 on the side rod 250 that previously coincided with the intermediate rod 271. Next, it is only necessary to extend the telescopic end of the first electric telescopic rod 273 outward and rotate the first electric telescopic rod 273 in the opposite direction around its axis so that the toggle block 275 abuts against the roller 260 on the left. After the toggle block 275 abuts against the roller 260, the first electric telescopic rod 273 stops extending and continues to rotate in the opposite direction. Next, the telescopic end of the double-headed electric telescopic rod 274 contracts, so that the position of the roller 260 can be swapped left and right. In this way, after the trolley chain 220 rotates one circle, the rollers 260 installed on the side rods 250 that rotate to coincide with the axis of the middle rod 271 are all swapped left and right, so that the rollers 260 can be evenly stressed and the wear difference is reduced.

[0066] In a further embodiment, Figure 7 As shown, an annular groove 261 is formed on the outer circumference of the roller 260 , and an end of the toggle block 275 is provided with a toggle protrusion 2751 , which is matched with the annular groove 261 .

[0067] The purpose of providing the toggle protrusion 2751 and the annular groove 261 is to increase the connection stability between the roller 260 and the toggle block 275 , so as to ensure that the toggle block 275 can toggle the roller 260 to move along the axis of the side rod 250 .

[0068] In a further embodiment, the exchange unit 270 also includes a first motor 277, a drive screw 278 and a guide rod 279. The first motor 277 is arranged on the frame 210, and the output end of the first motor 277 is fixedly connected to the drive screw 278. The drive screw 278 is threadedly connected to the sliding block 272, and the axis of the drive screw 278 extends in the front and rear directions. Both ends of the guide rod 279 are connected to the frame 210, and the guide rod 279 is slidably connected to the sliding block 272, and the axis of the guide rod 279 is parallel to the axis of the drive screw 278.

[0069] During use, the first motor 277 is started, and the drive screw 278 is driven to rotate through the output end of the first motor 277 , and the drive screw 278 drives the sliding block 272 to move back and forth along the axis of the guide rod 279 .

[0070] In a further embodiment, Figure 1 As shown, an automatic unloading device for a stacking chain conveying system further includes a driving sprocket 310 and a driven sprocket 320. The driving sprocket 310 and the driven sprocket 320 have the same diameter and are spaced apart from each other. The driving sprocket 310 can rotate around its own axis. Specifically, a second motor can be arranged on the outside of the guide rail 100 so that the output end of the second motor is fixedly connected to the driving sprocket 310. Both the driving sprocket 310 and the driven sprocket 320 are transmission-connected to the transmission chain 300.

[0071] When in use, the second motor is started to drive the driving sprocket 310 to rotate, the driving sprocket 310 drives the transmission chain 300 to rotate, and the transmission chain 300 drives the driven sprocket 320 to rotate, thereby achieving stable circumferential transmission of the transmission chain 300.

[0072] In a further embodiment, Figure 2 As shown, arc-shaped plates 290 are further provided at the front and rear ends of the vehicle frame 210 , and the diameter of the arc-shaped plates 290 is adapted to the diameter of the driving sprocket 310 .

[0073] The arc plate 290 is provided so that when the tray assembly 200 moves to the corner position of the guide rail 100, the arc plate 290 can cooperate with the guide of the corner area of the guide rail 100 to enable the tray assembly 200 to move from the upper part of the guide rail 100 to the lower part of the guide rail 100 or from the lower part of the guide rail 100 to the upper part of the guide rail 100.

[0074] In a further embodiment, Figure 1As shown, a plurality of rigid support frames 110 are provided on the inner side of the guide rail 100 , and the plurality of rigid support frames 110 are arranged at intervals along the length direction of the guide rail 100 .

[0075] A plurality of rigid support frames 110 are provided to support the guide rail 100 and prevent the guide rail 100 from being deformed.

[0076] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic unloading device for a power-and-free chain conveyor system, characterized in that: include: guide; Tray assembly, there are multiple tray assemblies, and the multiple tray assemblies are slidably arranged on the guide rail; A transmission chain is provided on the guide rail, and the transmission chain can rotate circumferentially around the guide rail, and the tray assembly and the transmission chain have a first cooperation form and a second cooperation form. In the first cooperation form, the tray assembly and the transmission chain rotate synchronously, and in the second cooperation form, the tray assembly and the transmission chain rotate relative to each other; There are multiple automatic grippers, and the multiple automatic grippers are connected to the multiple tray assemblies in a one-to-one correspondence; The tray assembly includes a frame, a trolley chain, a trolley sprocket, a center sprocket, a side rod, a roller and a replacement unit. The trolley sprockets are four and divided into two groups, with two in each group. The two groups of trolley sprockets are spaced front and back and rotatably arranged on the frame. The two trolley sprockets in each group are spaced left and right and coaxially arranged. There are two trolley chains. The two trolley chains are transmission-connected to the two groups of trolley sprockets. The center sprocket is located between the two trolley sprockets spaced left and right and is coaxially arranged with the trolley sprocket. The center sprocket is transmission-connected to the transmission chain, and the center sprocket can rotate around its axis. There are multiple side rods, and the multiple side rods are divided into two groups. The two groups of side rods are spaced left and right, and the multiple side rods in each group are equally spaced inside the trolley chain on the corresponding side. There are multiple rollers and divided into multiple groups. The multiple groups of rollers are alternately left and right and rotatably arranged outside the side rods on the corresponding side. The rollers are in rolling contact with the guide rails. The replacement unit is provided on the frame, and the replacement unit is used to exchange positions of the multiple groups of rollers between the corresponding left and right groups of side rods.

2. The automatic unloading device for a power-and-free chain conveyor system according to claim 1, characterized in that: The exchange unit includes an intermediate rod, a sliding block, a first electric telescopic rod, a double-headed electric telescopic rod, a toggle block and an electromagnetic block. The sliding block is slidably connected to the frame and can slide linearly in the front-to-back direction. There are two electromagnetic blocks, which are arranged at intervals on the upper part of the sliding block in the front-to-back direction. The first electric telescopic rod can rotate around its axis. The first electric telescopic rod is rotatably arranged on the upper part of the sliding block and the axis of the first electric telescopic rod passes through the center point of the line connecting the two electromagnetic blocks in the front-to-back direction. The first electric telescopic rod can rotate around its axis. The axis of the double-headed electric telescopic rod is perpendicular to the axis of the first electric telescopic rod, and the center point of the double-headed electric telescopic rod is located on the axis of the first electric telescopic rod. There are two toggle blocks and are respectively arranged at both ends of the double-headed electric telescopic rod. A slot is provided at the upper end of the electromagnetic block, and the middle rod is movably placed in the slot; When the axis of the middle rod coincides with the axis of the side rod in the left-right direction and the electromagnetic block is de-energized, the middle rod can be moved out of the slot and coaxially abut against the left and right side rods; When the axis of the middle rod coincides with the axis of the side rod in the left-right direction and the electromagnetic block is energized, the middle rod can be reset and moved into the slot.

3. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: The end surface of the side rod away from the trolley chain is an elliptical surface, and the axis of the elliptical surface is inclined downward; The end faces at both ends of the middle rod are also elliptical surfaces, and the end faces at both ends of the middle rod can be in surface contact with the end face of the side rod away from the trolley chain.

4. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: An annular groove is provided on the outer peripheral surface of the roller; The end of the toggle block is provided with a toggle protrusion, which is matched with the annular groove.

5. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: The exchange unit also includes a first motor, a driving screw and a guide rod. The first motor is arranged on the frame, the output end of the first motor is fixedly connected to the driving screw, the driving screw is threadedly connected to the sliding block, and the axis of the driving screw extends in the front and rear directions. Both ends of the guide rod are connected to the frame, and the guide rod is slidably connected to the sliding block, and the axis of the guide rod is parallel to the axis of the driving screw.

6. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: A trigger is provided at the rear end of the frame; The tray assembly also includes a brake unit, which is arranged in the frame and cooperates with the central sprocket. The brake unit is also connected to the trigger signal; The brake unit is configured to restrict the central sprocket from rotating about its own axis when the trigger is not triggered; The brake unit is further configured to remove the restriction on the central sprocket from rotating around its own axis when the trigger is triggered.

7. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: It also includes a driving sprocket and a driven sprocket. The driving sprocket and the driven sprocket have the same diameter and are spaced apart from each other. The driving sprocket can rotate around its own axis. Both the driving sprocket and the driven sprocket are connected to the transmission chain.

8. The automatic unloading device for a power-and-free chain conveyor system according to claim 7, characterized in that: The front and rear ends of the frame are further provided with arc-shaped plates, and the diameter of the arc-shaped plates is adapted to the diameter of the driving sprocket.

9. The automatic unloading device for a power-and-free chain conveyor system according to claim 2, characterized in that: The first magnets are embedded at both ends of the middle rod, and the second magnet is embedded at one end of the side rod away from the frame; The magnetic properties of the sides of the first magnet and the second magnet facing each other are opposite.

10. The automatic unloading device for a power-and-free chain conveyor system according to claim 1, characterized in that: A plurality of rigid support frames are provided on the inner side of the guide rail, and the plurality of rigid support frames are arranged at intervals along the length direction of the guide rail.

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