Double-working-position stacker with built-in buffer area and docking area working method thereof

Abstract

The present invention relates to a double-working position stacker with a built-in buffer zone and a working method for a docking area thereof, comprising a stacker seat and a lifting mechanism, wherein the stacker seat is provided with a buffer zone, the buffer zone comprises multiple layers of buffer conveyor belts, the buffer zones are open at both ends of the buffer conveyor belt in the conveying direction, and each layer of the buffer conveyor belts can be independently driven in both directions; the stacker seat is provided with cargo platforms at both ends of the buffer conveyor belt in the conveying direction, the lifting mechanism is used to drive the lifting of the cargo platform, and the maximum lifting height of the cargo platform is not less than the sum of the height of the cargo platform and the height of the buffer zone; the cargo platform is provided with a lower conveying mechanism and a liftable upper clamping mechanism, and the lower conveying mechanism comprises a conveyor belt that can be driven in both directions; the advantage is that the stacker has multiple buffer positions, and for particularly long lanes, storage and retrieval integration can be achieved, and in the process of walking from one end of the lane to the other end, goods can be stored and retrieved at the same time, which saves the walking time of the stacker and improves efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of stackers, and in particular relates to a double-working position stacker with a buffer area and a working method of a docking area thereof. Background Art

[0002] The automated warehouse is a new concept in logistics warehousing. It is a warehouse that uses high-rise shelves to store materials, is controlled and managed by computers, and uses automatically controlled stackers to store and retrieve materials. The aisle stacker is a special crane developed with the emergence of automated warehouses. It is usually referred to as a stacker and is the most important lifting and transportation equipment in automated warehouses. The stacker runs along the track in the aisle of the automated warehouse, and stores the materials at the entrance of the aisle into the designated cargo compartment, or takes out the materials in the designated cargo compartment and transports them to the aisle entrance, completing the storage and retrieval of materials.

[0003] Traditional stackers have the following defects: there are no cache slots on the stacker or there is only one cache slot on each layer, which makes the efficiency of taking goods low; the goods must be packaged in fixed sizes or placed on fixed-size carriers, and there are certain requirements for the packaging method or carrier. For smart warehouses with a large number of products in and out of the warehouse, the normal daily check-in and check-out quantity can only be met by increasing the number of stackers.

[0004] Based on this, this case is brought forward. Summary of the invention

[0005] The object of the present invention is to provide a double-working position stacker with a built-in buffer area and a working method of a docking area thereof, so as to realize storage and retrieval integration, save the walking time of the stacker and improve the efficiency.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A double-working-position stacker with a built-in buffer zone comprises a stacker seat and a lifting mechanism, wherein the stacker seat is provided with a buffer zone, the buffer zone comprises multiple layers of buffer conveyor belts, the buffer zones are open at both ends located in the conveying direction of the buffer conveyor belts and each layer of the buffer conveyor belts can be independently driven in both directions; the stacker seat is provided with a cargo platform at both ends located in the conveying direction of the buffer conveyor belts, the lifting mechanism is used to drive the lifting of the cargo platform, and the maximum lifting height of the cargo platform is not less than the sum of the height of the cargo platform and the height of the buffer zone; the cargo platform is provided with a lower conveying mechanism and a liftable upper clamping mechanism, the lower conveying mechanism comprises a conveying conveyor belt that can be driven in both directions, and the conveying conveyor belt and the buffer conveyor belt cooperate to realize the transportation of goods.

[0008] Furthermore, each layer of the buffer conveyor belt is provided with telescopic blocking blocks at both ends in the conveying direction.

[0009] Furthermore, each layer of the buffer conveyor belt is divided into a plurality of cargo positions in the conveying direction, and a detection sensor is provided on each cargo position.

[0010] Furthermore, the cargo platform includes a cargo platform frame, the upper clamping mechanism includes a welding frame slidably connected to the cargo platform frame and a welding frame lifting drive mechanism for controlling the lifting of the welding frame, the welding frame is connected to a screw rod through a bearing and is provided with a first driving part for driving the screw rod, the screw rod is connected to two screw nuts with opposite rotation directions, a bidirectional telescopic manipulator is fixed to the screw nut, and the two bidirectional telescopic manipulators are arranged opposite to each other.

[0011] Furthermore, the welding rack lifting drive mechanism includes a screw rod 2 and a second drive unit for driving the screw rod 2, the second drive unit is fixed on the cargo platform frame, the screw rod 2 is connected to the cargo platform frame through a bearing, and the screw rod 2 is provided with a screw rod nut 2 fixed to the welding rack.

[0012] Furthermore, the lower conveying mechanism includes a conveyor belt transmission system for driving the conveyor belt, and the conveyor belt transmission system includes a third driving unit and a driving shaft arranged above the cargo platform frame, the third driving unit is used to drive the driving shaft, and a driven shaft is provided on the conveyor belt, and synchronous wheels are provided on the driving shaft and the driven shaft, and the synchronous wheels on the driving shaft and the driven shaft are driven by synchronous belts, and the synchronous belts, synchronous wheels and driving shafts are arranged along the frame of the cargo platform frame.

[0013] Furthermore, there are multiple conveyor belts, and a smoothing bar device is provided between two adjacent conveyor belts, and a smoothing bar lifting and driving mechanism is provided on the cargo platform frame.

[0014] Furthermore, each open end side of the stacker seat located in the buffer area is provided with a column, the cargo platform frame is slidably connected to the column, and the height of the column above the buffer area is not less than the height of the cargo platform.

[0015] Furthermore, bottom running wheels for running on the track are installed on both sides of the stacker seat, and top running wheels for running on the track are installed on the top of the column.

[0016] A docking area working method of a double-working position stacker with a buffer zone, comprising the above-mentioned stacker, wherein the docking area is provided with a warehouse-out area and a warehouse-in area with the same structure as the buffer zone, and the warehouse-out area and the warehouse-in area are provided with warehouse area conveyor belts of which each layer can be independently driven in both directions, and the docking area working method comprises the following steps:

[0017] S1. When the stacker approaches the outbound or inbound area, the loading platform on the docking area side rises above the buffer area to make room for docking;

[0018] S2. The buffer area is connected to the outbound area or inbound area;

[0019] S3. The warehouse conveyor belt and the buffer conveyor belt cooperate to transport the goods.

[0020] The advantages of the present invention are:

[0021] 1. The stacker has multiple cache locations. Each layer of the cache area can be independently and bidirectionally transferred. For particularly long aisles, it can realize integrated storage and retrieval. In the process of walking from one end of the aisle to the other, the stacker can store and retrieve goods at the same time, which saves the walking time of the stacker and improves efficiency.

[0022] 2. The cargo platform of the stacker has a two-way synchronous clamping system on the upper layer and a conveying mechanism on the lower layer. The two-way synchronous clamping system can realize the picking and placing of soft-packaged goods within a certain size range between the lifting cargo platform of the aisle stacker and the shelf. At the same time, the double-layer mechanism of the cargo platform can realize the movement of goods in four directions: X+, X-, Y+ and Y-.

[0023] 3. The stacker is equipped with two symmetrical lifting platforms. When entering the warehouse, one side of the platform is used to fork the goods from the platform to the warehouse, while the other side is used to transfer the goods from the buffer area to the platform. When leaving the warehouse, one side of the platform is used to drag the goods from the warehouse to the platform, while the other side is used to transfer the goods from the platform to the buffer area, which improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the three-dimensional structure of a stacker in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the main view;

[0026] Figure 3 This is a schematic diagram of the structure of the cargo platform in the embodiment;

[0027] Figure 4 This is a schematic diagram of the structure of the cargo platform frame in the embodiment;

[0028] Figure 5 Schematic diagram of the structure of the upper clamping mechanism in the embodiment;

[0029] Figure 6 for Figure 5 A top view of a

[0030] Figure 7 It is a schematic diagram of the structure of the conveyor belt transmission system in the embodiment;

[0031] Figure 8 This is a schematic diagram of the installation of the conveyor belt and the smooth strip device in the embodiment;

[0032] Fig. 9 A schematic diagram of the structure of a bidirectional telescopic manipulator in an embodiment;

[0033] Fig.10 for Figure 3 Schematic diagram of the operating status;

[0034] Fig.11 Schematic diagram of the cooperation between the stacker and the docking area in the embodiment;

[0035] Description of symbols

[0036] 100. Cargo platform frame, 101. C-shaped groove, 102. Guide rail 2;

[0037] 200. upper clamping mechanism, 201. welding frame, 202. guide wheel, 203 slider, 204. first driving part, 205. guide rail 1, 206. mounting plate, 207. screw rod 1, 208. screw rod nut 1, 209. screw rod 2, 210. second driving part, 211. screw rod nut 2;

[0038] 300. lower conveying mechanism, 301. conveying conveyor belt, 302. smooth strip device, 303. synchronous belt, 304. smooth strip lifting drive mechanism, 305. third driving part, 306. driving shaft, 307. driven shaft, 308. synchronous wheel;

[0039] 400. Bidirectional telescopic manipulator, 401. Fork-pull, 402. Fork-push;

[0040] 501. Dual ground tracks, 502. Dual sky tracks;

[0041] 600. Buffer area, buffer conveyor belt 601, telescopic blocking block 602, detection sensor 603;

[0042] 700. Stacker seat, 701. Bottom running wheel, 702 top running wheel, 703 cargo platform lifting mechanism;

[0043] 800. Column, 801 three-sided surrounding guide wheel;

[0044] 900 outbound area, 901 inbound area, 902 warehouse area conveyor belt. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below in conjunction with embodiments, and the X direction and Y direction in the following description shall be based on the directions indicated in the drawings.

[0046] like Figure 1 and 2As shown, this embodiment proposes a double-working position stacker with a built-in buffer area, including a stacker seat 700, a translation mechanism, a cargo platform lifting mechanism 703, a cargo platform and a buffer area 600. The stacker seat 700 is a plate-type structure, and the translation mechanism is installed on the stacker seat 700, including a bottom running wheel 701, a top running wheel 702 and a reduction motor driving the bottom running wheel 701 to run. The buffer area 600 is fixed above the middle of the stacker seat 700. Since the stacker is equipped with a buffer area 600, it is more cumbersome than a traditional stacker, and a total of four tracks need to be set up in the warehouse, namely, Figure 1 The double ground rails 501 and the double overhead rails 502 are used to improve the walking stability of the stacker. Figure 1 The double ground rails 501 are raised by angle steel, and the stacker seat 700 is not placed on the bottom running wheels 701, but the bottom running wheels 701 are placed on both sides of the stacker seat 700, so that the stacker seat 700 can sink. This design can reduce the requirements for the warehouse floor and save space in the height direction.

[0047] In this embodiment, the buffer area 600 has a total of 8 layers, each layer is provided with a buffer conveyor belt 601 that can be driven in both directions independently, the buffer conveyor belt 601 runs along the X direction, and telescopic blocking blocks 602 are provided at both ends of the conveying direction. Each layer of the buffer conveyor belt 601 is divided into three storage positions along the X direction, and a detection sensor 603 is provided on each storage position. Figure 1 As shown, since the buffer area 600 of this embodiment is open at both ends of the buffer conveyor belt 601, loading at one end and unloading at the other end can be achieved through the buffer conveyor belt 601. When only goods are loaded, the telescopic blocking block 602 at the loading end shrinks and gives way, and the telescopic blocking block 602 at the unloading end extends to stop; when only goods are unloaded, the telescopic blocking block 602 at the unloading end shrinks and gives way, and the telescopic blocking block 602 at the loading end extends to stop; when loading at one end and unloading at the other end at the same time, the telescopic blocking blocks 602 at both ends shrink and give way at the same time; when the loading and unloading process is not performed, the telescopic blocking block 602 extends to stop at both ends. The detection sensor 603 is used to confirm whether the goods are delivered in place to ensure the accuracy of each loading and unloading.

[0048] In the present embodiment, there are two cargo platforms and cargo platform lifting mechanisms 703, which are respectively placed at the two ends of the buffer area 600 in the X direction. The buffer area 600 in the present embodiment is a rectangular structure, so two columns 800 are provided at each open end of the buffer area 600, and the four columns 800 are arranged in close contact with the frame of the buffer area 600. The cargo platform is slidably connected to the columns 800 through three-sided surrounding guide wheels 801, and vertical lifting is achieved through the cargo platform lifting mechanism 703. The height of the column 800 above the buffer area 600 is not less than the height of the cargo platform, so that the maximum lifting height of the cargo platform is not less than the sum of the height of the cargo platform and the height of the buffer area 600. Fig.11 As shown, the docking area is provided with a warehouse-out area 900 and a warehouse-in area 901 of the same structure as the buffer area 600, and a track is provided at the bottom of the docking area, which can be translated in the Y direction. The warehouse-out area 900 and the warehouse-in area 901 are also provided with 8 layers, and each layer is provided with a warehouse conveyor belt 902 that can be driven independently in both directions. The warehouse-out area 900 is used to receive the goods on the buffer area 600 to realize warehouse-out, and the warehouse-in area 901 is used to transport the goods to the buffer area 600 to realize warehouse-in. When the stacker needs to cooperate with the docking area, the cargo platform on the side of the docking area can be raised to the top (that is, raised to the part where the column 800 is higher than the buffer area 600) to make way for the docking of the docking area and the buffer area 600.

[0049] like Figures 3 to 10 As shown, this embodiment proposes a cargo platform for transporting goods in non-fixed-size soft packages on a three-dimensional warehouse aisle stacker, including a cargo platform frame 100, a lower conveying mechanism 300, and an upper clamping mechanism 200. The cargo platform frame 100 is used for sliding connection with the column 800.

[0050] like Figure 5 As shown, the upper clamping mechanism 200 includes a U-shaped welding frame 201 and a welding frame lifting driving mechanism for controlling the lifting of the welding frame 201. The welding frame 201 is slidably connected to the cargo platform frame 100. The middle part of the welding frame 201 is connected to a screw rod 207 through a bearing and is provided with a first driving part 204 for driving the screw rod 207. The screw rod 207 is arranged along the X direction. The first driving part 204 adopts a servo motor with a reducer and is installed in the middle of the screw rod 207. Two screw rod nuts 208 with opposite rotation directions are connected to the screw rod 207 on both sides of the first driving part 204. The screw rod nut 208 is fixedly connected to the two-way telescopic manipulator 400 that is telescopic along the Y direction through the mounting plate 206. Through the screw rod 207, the two two-way telescopic manipulators 400 are synchronously approached or separated, and the clamping and releasing actions are realized.

[0051] The bidirectional synchronous clamping drive system can realize the picking and placing of soft-packaged goods within a certain size range between the lifting platform of the aisle stacker and the shelf. At the same time, compared with the traditional method, this function can well ensure that the position of the materials can always be placed in the center during the operation between the warehouse and the loading platform, especially for soft-packaged goods, which are difficult to ensure that their position is always centered during the transfer process using traditional methods.

[0052] like Figure 6As shown, in order to make the approaching or moving away movement and the bidirectional telescopic movement of the bidirectional telescopic manipulator 400 more stable, in this embodiment, guide rails 205 parallel to the screw rod 207 are provided at both ends of the welding frame 201 in the Y direction, and the bidirectional telescopic manipulator 400 and the guide rail 205 are slidably connected via a mounting plate 206, that is, each bidirectional telescopic manipulator 400 is connected to the welding frame 201 via three mounting plates 206.

[0053] like Figures 4 to 6 As shown, a linear guide mechanism is provided between the welding frame 201 and the cargo platform frame 100, that is, a guide wheel 202 and a slider 203 are provided on both sides of the welding frame 201 in the X direction, and a C-shaped groove 101 matching with the slider 203 and a guide rail 102 matching with the slider 203 are provided on the cargo platform frame 100. Such a design can reduce the precision requirements of the lifting action for machining. The welding frame lifting drive mechanism of this embodiment includes a screw rod 209 and a second driving part 210 for driving the screw rod 209. The second driving part 210 adopts a motor and is fixed on the cargo platform frame 100. The screw rod 209 is connected to the cargo platform frame 100 through a bearing. The screw rod 209 is provided with a screw nut 211 fixed to the welding frame 201. The length of the screw rod 209 of this embodiment needs to be less than the height of the cargo platform frame 100 to avoid interference between the upper clamping mechanism 200 and the lower conveying mechanism 300.

[0054] The lower conveying mechanism 300 includes a conveyor belt 301 and a conveyor belt transmission system. The conveyor belt 301 can move goods from the stacker buffer area 600 to the cargo platform or from the cargo platform to the buffer area 600 in both directions. Compared with relying on a manipulator to push the material to move, it not only saves space, but also makes it easier to accurately and easily move back and forth between two positions for materials with high friction and easy deformation. Figure 7 and 8As shown, the conveyor belt transmission system of this embodiment includes a third driving unit 305 and a driving shaft 306 arranged above the cargo platform frame 100. The third driving unit 305 adopts a motor with a reducer, and the driving shaft 306 is connected to the cargo platform frame 100 through a bearing. The third driving unit 305 is used to drive the driving shaft 306 to rotate (the transmission between the two can be through gears, or through the synchronous wheel 308 and the synchronous belt 303 shown in the figure). A driven shaft 307 is provided on the conveyor belt 301, and the conveyor belt 301 is driven to rotate by the driven shaft 307. Both ends of the driving shaft 306 and the driven shaft 307 are provided with synchronous wheels 308. The synchronous wheels 308 on the driving shaft 306 and the synchronous wheels 308 on the driven shaft 307 are driven by the synchronous belt 303. The synchronous belt 303, synchronous wheel 308 and driving shaft 306 of this embodiment are arranged along the frame of the cargo platform 100, and the driving mechanism is arranged above the cargo platform frame 100, which can make the transmission area more concise and reduce interference.

[0055] Furthermore, the conveyor belt 301 of this embodiment is divided into multiple strips, and a smooth strip device 302 is provided between two adjacent conveyor belts 301. The smooth strip device 302 is used to reduce the friction between the goods and the lifting platform. At the same time, since the conveying direction of the conveyor belt 301 and the telescopic direction of the two-way telescopic manipulator 400 are generally not in the same direction, the present embodiment is also provided with a smooth strip lifting drive mechanism 304 on the top of the platform frame 100. For example, in the device of this embodiment, the transmission belt is conveyed along the X direction, and the two-way telescopic manipulator 400 is telescopic along the Y direction, that is, the friction between the goods and the platform includes friction in the X-axis and Y-axis directions. When the goods are transferred along the Y axis, the smooth strip device 302 rises to prevent the conveyor belt from being rubbed laterally; when the goods are transferred along the X axis, the smooth strip device 302 falls, and the goods are completely in contact with the conveyor belt and are conveyed by the conveyor belt. Compared with the design of the traditional stacker lifting platform to change the conveying direction by rotating the fork, the structure of this embodiment is simpler.

[0056] The bidirectional telescopic manipulator 400 of this embodiment is a prior art, a three-stage structure (it can be more stages or a two-stage structure), and a built-in driving device to achieve bidirectional telescopic. The first stage of the bidirectional telescopic manipulator 400 is used to achieve fixation with the welding frame 201, and the second and third stages are used for bidirectional movement in the Y-axis direction. At the same time, a fork is provided at both ends of the bidirectional telescopic manipulator 400 in the Y direction. The fork is connected to the bidirectional telescopic manipulator 400 through a bearing and is controlled by the built-in motor of the bidirectional telescopic manipulator 400 to achieve rotation. Whenever the bidirectional telescopic manipulator 400 is telescoped to the specified position, the fork rotates 90 degrees. When the bidirectional telescopic manipulator 400 performs the next action (lifting or shrinking), the goods are pulled or pushed to the corresponding position by the fork.

[0057] The use process of this embodiment is as follows:

[0058] When cooperating with the docking area: when the stacker approaches the outgoing area 900 or the incoming area 901, the cargo platform on the docking area side rises above the buffer area 600 to make room for docking; the buffer area 600 docks with the outgoing area 900 or the incoming area 901; the warehouse conveyor belt 902 cooperates with the buffer conveyor belt 601 to realize the transportation of goods.

[0059] When picking up goods from the shelf: Assuming that the goods to be picked up by the stacker are A0, the stacker moves to the designated position, and the cargo platform lifting mechanism 703 lifts the cargo platform (in this paragraph Figure 2 The loading platform on the right side of the middle is taken as an example) and is lifted to the specified height. The smooth bar lifting drive mechanism 304 works, and the smooth bar device 302 rises; at the same time, the welding rack lifting drive mechanism works to lower the welding rack 201 to the working position; the two bidirectional telescopic manipulators 400 work synchronously and extend in the Y+ direction to the position, such as Fig.10 As shown; the first driving part 204 drives the two-way telescopic manipulators 400 on both sides to synchronously clamp the cargo A0 through the screw rod 207 and the screw nut 208; the fork-pull 401 rotates 90 degrees to reach the blocking position; the two-way telescopic manipulator 400 works, moves the cargo A0 along the smooth strip to the Y-direction, and enters the cargo platform; the fork-pull rotates and retracts, and at the same time, the two-way telescopic manipulators 400 on both sides are released; the welding frame lifting drive mechanism works to drive the welding frame 201 to rise and return to the avoidance position; the smooth strip lifting drive mechanism 304 drives the smooth strip device 302 to descend, and the cargo AO is placed on the conveyor belt 301; the cargo platform lifting mechanism 703 lifts the cargo platform to be flush with a certain layer of the buffer area 600, and the conveyor belt 301 and the buffer conveyor belt 601 work synchronously to transfer the cargo from the cargo platform to the buffer area 600 along the X+ direction.

[0060] When loading goods onto the shelf, assume that the goods to be loaded and unloaded by the stacker are A1. A1 moves in the X-direction through the buffer conveyor belt 601 in the buffer area 600. At the same time, the loading platform (in this paragraph, Figure 2 (Taking the cargo platform on the right side in the middle as an example) the conveyor belt 301 works, docks the cargo A1 in the buffer area 600, and transfers A1 from the buffer area 600 to the cargo platform; at the same time, the stacker walks to the specified position, and then the cargo platform is lifted and lowered to the specified height with the cargo A1; the smooth bar lifting drive mechanism 304 works, and the smooth bar device 302 rises; the welding frame lifting drive mechanism drives it to descend to the working position; the first driving part 204 drives the two-way telescopic manipulators 400 on both sides to synchronously clamp the cargo A1 through the screw rod 207 and the screw rod nut 208; at the same time, the fork-push 402 rotates 90 degrees to reach the blocking position; the two-way telescopic manipulator 400 works, and extends A1 to the Y+ direction into place; A1 is pushed into the cargo position, and the two-way telescopic manipulator 400 synchronously moves to both sides to release A1, and at the same time the fork-push 402 is reset; the two-way telescopic manipulator 400 works and retracts to its original position.

[0061] Since two symmetrical loading platforms are provided, when entering the warehouse, while the cargo is forked from the loading platform to the cargo warehouse by one side, the cargo is transferred from the buffer area 600 to the loading platform by one side; when leaving the warehouse, while the cargo is dragged from the cargo warehouse to the loading platform by one side, the cargo is transferred from the loading platform to the buffer area 600 by one side, thereby improving work efficiency.

[0062] The above embodiments are only used to explain the concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A double-working-station stacker with a built-in buffer zone, comprising a stacker seat and a lifting mechanism, characterized in that: The stacker seat is provided with a buffer area, which includes multiple layers of buffer conveyor belts. The buffer areas are open at both ends of the buffer conveyor belt in the conveying direction, and each layer of the buffer conveyor belt can be independently driven in both directions; the stacker seat is provided with cargo platforms at both ends of the buffer conveyor belt in the conveying direction, and the lifting mechanism is used to drive the lifting of the cargo platform, and the maximum lifting height of the cargo platform is not less than the sum of the height of the cargo platform and the height of the buffer area; the cargo platform is provided with a lower conveying mechanism and a liftable upper clamping mechanism, and the lower conveying mechanism includes a conveying conveyor belt that can be driven in both directions, and the conveying conveyor belt and the buffer conveyor belt cooperate to realize the transportation of goods; The cargo platform comprises a cargo platform frame, the upper clamping mechanism comprises a welding frame slidably connected to the cargo platform frame and a welding frame lifting driving mechanism for controlling the lifting of the welding frame, the welding frame is connected to a screw rod 1 through a bearing and is provided with a first driving part for driving the screw rod 1, the screw rod 1 is connected to two screw rod nuts 1 with opposite rotation directions, a bidirectional telescopic manipulator is fixed to the screw rod nut 1, and the two bidirectional telescopic manipulators are arranged oppositely; There are multiple conveyor belts, a smoothing strip device is provided between two adjacent conveyor belts, and a smoothing strip lifting and driving mechanism is provided on the cargo platform frame; The two ends of the bidirectional telescopic manipulator in the telescopic direction are provided with forks, and the built-in motor of the bidirectional telescopic manipulator controls the forks to rotate. Whenever the bidirectional telescopic manipulator is telescoped to a specified position, the forks rotate 90 degrees. When the bidirectional telescopic manipulator performs the next action, the goods are pulled or pushed to the corresponding position by the forks.

2. A double-station stacker with a built-in buffer area as claimed in claim 1, characterized in that: Each layer of the buffer conveyor belt is provided with telescopic blocking blocks at both ends of the conveying direction.

3. A double-station stacker with a built-in buffer area as claimed in claim 1, characterized in that: Each layer of the buffer conveyor belt is divided into multiple cargo positions in the conveying direction, and each cargo position is equipped with a detection sensor.

4. A double-station stacker with a built-in buffer area as claimed in claim 1, characterized in that: The welding rack lifting drive mechanism includes a screw rod 2 and a second drive unit for driving the screw rod 2, the second drive unit is fixed on the cargo platform frame, the screw rod 2 is connected to the cargo platform frame through a bearing, and the screw rod 2 is provided with a screw rod nut 2 fixed to the welding rack.

5. A double-station stacker with a built-in buffer area as claimed in claim 1, characterized in that: The lower conveying mechanism includes a conveyor belt transmission system for driving the conveyor belt, and the conveyor belt transmission system includes a third driving unit and a driving shaft arranged above the cargo platform frame. The third driving unit is used to drive the driving shaft. A driven shaft is provided on the conveyor belt. Both the driving shaft and the driven shaft are provided with synchronous wheels. The synchronous wheels on the driving shaft and the synchronous wheels on the driven shaft are driven by synchronous belts. The synchronous belts, synchronous wheels and driving shafts are arranged along the frame of the cargo platform frame.

6. A double-station stacker with a built-in buffer area as claimed in claim 1, characterized in that: Each open end side of the stacker seat located in the buffer area is provided with a column, and the cargo platform frame is slidably connected to the column, and the height of the column above the buffer area is not less than the height of the cargo platform.

7. A double-station stacker with a built-in buffer area as claimed in claim 6, characterized in that: Bottom running wheels for running on the track are installed on both sides of the stacker seat, and top running wheels for running on the track are installed on the top of the column.

8. A docking area working method of a double-working-station stacker with a built-in buffer area based on any one of claims 1 to 7, characterized in that: The docking area is provided with a warehouse-out area and a warehouse-in area with the same structure as the buffer area. The warehouse-out area and the warehouse-in area are provided with warehouse area conveyor belts of which each layer can be independently driven in both directions. The working method of the docking area includes the following steps: S1. When the stacker approaches the outbound or inbound area, the loading platform on the docking area side rises above the buffer area to make room for docking; S2. The buffer area is connected to the outbound area or inbound area; S3. The warehouse conveyor belt and the buffer conveyor belt cooperate to transport the goods.

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