Tray feeding system for trolley

Abstract

The tray feeding system for the trolley comprises a machine frame, at least two feeding and discharging stations containing skip cars, a transplanting mechanism and a mechanical arm are arranged in the machine frame, a set of trays can be stacked in the skip cars layer by layer, a lifting mechanism capable of driving the skip cars to ascend and descend is arranged in the feeding and discharging stations, and the mechanical arm is arranged in the lifting mechanism. Separating mechanisms located on the left side and the right side of the skip car are arranged on the top of the feeding and discharging station and used for separating the trays. The transplanting mechanism comprises a moving track erected above a set of feeding and discharging stations and a clamp horizontally moving along the moving track, and the clamp is located above the separating mechanism, located on the front side and the rear side of the material disc and used for clamping the material disc separated by the separating mechanism. The mechanical arm picks up materials in the material disc clamped by the clamp, and the material disc is switched between the two feeding and discharging stations through translation of the clamp. According to the scheme, stable feeding and discharging of the skip car are guaranteed through the result of maximizing and compacting the feeding and discharging stations, rotary switching operation among the multiple feeding and discharging stations is achieved in cooperation with the transplanting mechanism, and the feeding and discharging efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a feeding device technical field, specifically relates to a tray feeding system for trolley. BACKGROUND

[0002] In the mechanical processing industry, workpiece automatic feeding device occupies quite important position. The processing of a product often involves multiple processes, at present, in the automatic equipment, according to the structure of workpiece, there are various mechanical hand feeding devices, but some small workpieces such as the mechanical hand feeding, the cost is too high, it is difficult to be adopted by enterprises, and some workpieces are small in size or special in form, are not suitable for being grabbed by mechanical hand. Usually, loading and supporting are carried out by using tray, and then the tray is transported to carry out feeding, as disclosed in the announcement no. CN 210794879 U.

[0003] The conventional feeding tool that adopts tray to feed usually is equipped with a conveying trolley to convey trays in batches, and the existing feeding tool is one kind of lifting mechanism to grab trays one by one to feed, which needs a gripper that can be lifted up and down to grab and convey trays; the other kind is to lift up the tray from the bottom of a stack of trays, and to transplant the tray on the top of the group of trays to be lifted to realize switching, which needs a space between the surface of the trolley and the bottom tray to enable the lifting mechanism to be inserted to separate and lift the tray from the trolley. No matter which method is used, a gap is formed between the upper and lower stations and the four sides of the trolley and the tray, which causes space waste, limits the number of trays that can be conveyed at a time, and easily causes the tray to shake during the up and down movement, which makes it difficult to align and stack the tray, and even causes the materials in the tray to shake and fall. Therefore, a feeding mechanism with more compact space is needed. SUMMARY

[0004] The utility model aims at overcoming the deficiencies in the prior art, and provides a tray feeding system for trolley.

[0005] The utility model discloses a tray feeding system for trolley, which comprises a trolley body, a tray conveying mechanism and a tray lifting mechanism.

[0006] The tray feeding system for trolley comprises a rack, at least two loading and unloading stations for accommodating trolleys, a transplanting mechanism and a mechanical hand are arranged in the rack, a group of trays can be stacked in layers in the trolley, a lifting mechanism for driving the trolley to lift is arranged in the loading and unloading station, and a separation mechanism is arranged on the top of the loading and unloading station and located on the left and right sides of the trolley for separating the trays; the transplanting mechanism comprises a moving track arranged above a group of the loading and unloading stations and a clamp for translating along the moving track, the clamp is located above the separation mechanism and on the front and back sides of the tray for clamping the tray separated by the separation mechanism, the mechanical hand picks up the material in the tray clamped by the clamp, and the tray is switched between the two loading and unloading stations through the translation of the clamp.

[0007] Preferably, the trolley comprises a supporting plate, rollers and a handle, a group of the rollers are arranged at the bottom of the supporting plate, the handle is detachably inserted into the side of the supporting plate through a bolt, the supporting plate is matched with the tray, and a group of limiting blocks matched with the bottom of the tray are arranged on the supporting plate to limit the tray.

[0008] Preferably, the lifting mechanism comprises a lifting motor, a connecting baffle and a supporting plate, the lifting motor is arranged on the rack, the motor shaft of the lifting motor drives the connecting baffle to lift up and down, two supporting plates are vertically fixed on the connecting baffle and extend outwardly and straightly from inside to outside, a positioning block is asymmetrically arranged on the top surface of each of the two supporting plates, a positioning hole matched with the positioning block is arranged on the bottom of the supporting plate, when the trolley is inserted into the loading and unloading station, the lifting motor drives the connecting baffle to move upward to make the positioning block and the positioning hole be connected, thereby completing the connection with the trolley.

[0009] Preferably, the front side of the loading and unloading station is open and connected with a door plate, limiting plates are arranged on the left and right sides thereof, and the lifting mechanism is arranged on the back side thereof, the inner side of the door plate is provided with a limiting vertical rod matched with the back side of the trolley, when the door plate is closed, the two limiting plates limit the left and right positions of the trolley, and the connecting baffle and the limiting vertical rod limit the front and back positions of the trolley.

[0010] Preferably, the rear bottom of the feeding and discharging station is provided with a position detector, the triggering end of which is opposite to the front side of the supporting plate; the left or right bottom of the feeding and discharging station is provided with a positioning cylinder whose cylinder end is opposite to the side of the supporting plate, and the side of the supporting plate is provided with a limiting through slot which matches the cylinder end of the positioning cylinder; when the trolley is inserted into the feeding and discharging station, the front side of the trolley abuts against the triggering end to trigger the position detector, the position detector controls the cylinder end of the positioning cylinder to extend into the limiting through slot, and simultaneously controls the lifting mechanism motor to drive the connecting baffle to move upward and abut against the trolley.

[0011] Preferably, the separating mechanism comprises a first assembly and a second assembly which are identical in structure and symmetrically arranged, and each of the first assembly and the second assembly comprises a first connecting plate and a second connecting plate, the bottom of the first connecting plate is slidably arranged on the rack by a horizontal cylinder, the bottom of the first connecting plate is vertically provided with a vertical cylinder which synchronously translates, the cylinder end of the vertical cylinder is fixedly connected to the bottom center of the second connecting plate to drive the second connecting plate to vertically move relative to the first connecting plate, the top of the first connecting plate and the second connecting plate is respectively provided with a first limiting block and a second limiting block which extend inwardly and horizontally, there are equidistant intervals between the sides of the two trays or between the tray and the supporting plate, the horizontal cylinder drives the first assembly and the second assembly to synchronously move relative to the two sides of the tray, so that the first limiting block and the second limiting block are simultaneously inserted into the first interval at the top, the vertical cylinder drives the second connecting plate to move upward, so that the second limiting block lifts the tray at the bottom, and the separation between the two trays or between the tray and the supporting plate is realized.

[0012] Preferably, the clamp comprises a first clamp arm and a second clamp arm which are identical in structure and symmetrically arranged, the first clamp arm and the second clamp arm are slidably arranged on the moving track through a sliding connecting plate, the two sliding connecting plates are connected by a connecting strip and synchronously move by a driving motor, the first clamp arm and the second clamp arm each comprise a clamping plate and a clamping cylinder, the clamping cylinder is arranged on the sliding connecting plate and drives the clamping plate to translate relative to the front and back sides of the tray to clamp or release the tray.

[0013] Preferably, the first clamp arm and the second clamp arm each comprise two clamping plates which are arranged at two corner edges of one side of the tray, and the inner side of the clamping plate is fixedly provided with a clamping block which matches the corner edge of the tray.

[0014] Preferably, three feeding and discharging stations are arranged in the rack, and each of the three feeding and discharging stations accommodates two trolleys stacked with trays and one empty trolley at a time, so that feeding and discharging is realized by rotating and switching the transplanting mechanism.

[0015] The beneficial effects of the utility model mainly show in:

[0016] 1、The trolley and the tray are formed into an integrated structure, and are lifted as a whole to maximize the saving of the accommodation space required by the trolley, save the space required by the feeding and discharging stations, make the feeding and discharging station structure more compact, form reliable and effective limiting for the trolley at the same time, ensure the stable lifting of the trolley, and then ensure the alignment and stable movement of the tray when the tray switches the feeding and discharging station, and avoid the shaking of the tray caused by knocking to cause the spilling of materials;

[0017] 2、The in-position detector and the positioning cylinder are arranged in the feeding and discharging station to cooperate with the lifting mechanism to realize the automatic operation of controlling the lifting of the trolley, so as to facilitate the improvement of the automation degree and efficiency of feeding and discharging;

[0018] 3、The separation mechanism is arranged to cooperate with the clamp to quickly clamp the tray, so as to avoid the difficulty in transplanting caused by the suction of the trays to each other. BRIEF DESCRIPTION OF DRAWINGS

[0019] The technical scheme of the utility model will be further described below in combination with the drawings:

[0020] Figure 1 : The schematic diagram of the embodiment of the utility model;

[0021] Figure 2 : The partial schematic diagram of the embodiment of the utility model;

[0022] Figure 3 : The schematic diagram of the trolley in the embodiment of the utility model;

[0023] Figure 4 : The schematic diagram of the supporting plate in the embodiment of the utility model;

[0024] Figure 5 : The schematic diagram of another angle of the supporting plate in the embodiment of the utility model;

[0025] Figure 6 : The schematic diagram of the separation mechanism in the embodiment of the utility model;

[0026] Figure 7 : The schematic diagram of the clamp in the embodiment of the utility model;

[0027] Figure 8 : The sectional view of the embodiment of the utility model;

[0028] Figure 9 : Figure 8 The enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0029] The utility model will be described in detail below in combination with the specific embodiments shown in the drawings. However, these embodiments are not limited to the utility model, and the changes in structure, method or function made by those skilled in the art based on these embodiments are all included in the protection scope of the utility model.

[0030] In the description of the scheme, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, the operator is taken as the reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0031] As shown in Figures 1 to 9 The utility model discloses a tray feeding system for trolley, including frame 1, at least two loading and unloading stations 100 that accommodate material car 2 are provided in frame 1, transplanting mechanism and manipulator 8, a group of material tray 200 can be stacked in material car 2 layer by layer, the lifting mechanism that can drive material car 2 lifts is provided in loading and unloading station 100, and the top of loading and unloading station 100 is provided with the separation mechanism located on the left and right sides of material car 2, for separating material tray 200, the transplanting mechanism includes the mobile track 301 that is set up on a group of loading and unloading stations 100 above and the clamp 3 that is translated along mobile track 301, clamp 3 is located above separation mechanism and is located on the front and rear sides of material tray 200, for clamping material tray 200 separated by separation mechanism, the manipulator 8 picks up the material in material tray 200 that clamp 3 holds, material tray 200 is switched between two loading and unloading stations 100 through the translation of clamp 3.

[0032] In the scheme, the material car 2 and the material tray 200 are formed into an integrated structure and are lifted as a whole to maximize the accommodation space required by the material car 2, thereby saving the space required by the loading and unloading station 100, making the loading and unloading station 100 more compact while reliably and effectively limiting the material car 2, ensuring the stable lifting of the material car 2, and further ensuring the alignment and stable movement of the material tray 200 when switching the loading and unloading station 100, avoiding shaking of the material tray 2 caused by knocking, and causing the material to spill.

[0033] Specifically as Figures 3-5As shown, the trolley 2 comprises a supporting plate 201, rollers 202 and a handle 203. A set of rollers 202 are arranged at the bottom of the supporting plate 201. The handle 203 is detachably inserted into the side of the supporting plate 201 through a pin 204. The supporting plate 201 is matched with the tray 200 to ensure that the tray 200 is stacked behind the supporting plate 201 to form an integrity. A set of limiting blocks 205 are arranged on the supporting plate 201 to match the bottom of the tray 200 to limit the tray 200. The limiting blocks 205 are arranged around the supporting plate 201 to ensure the stable placement of the tray 200. Further, two positioning columns 208 are asymmetrically arranged on two edges of the supporting plate 201 to form an error-proof structure to limit the placement direction of the tray 200 and avoid placing the tray 200 in reverse.

[0034] As shown, one side end of the handle 203 is detachably connected with the supporting plate 201 through the pin 204. When the trolley 2 needs to be pushed, the handle 203 is installed. After the trolley 2 is pushed into the feeding and discharging station 100, the pin 204 is pulled out to detach the handle 203, so as to eliminate the obstruction of the handle 203 to the trolley 2 in the lifting process of feeding and discharging, and simplify the space of the rack 1 and the feeding and discharging station 100.

[0035] As shown, Figure 2 The lifting mechanism comprises a lifting motor 401, a connecting baffle 402 and a supporting plate 403. The lifting motor 401 is arranged on the rack 1. The motor shaft drives the connecting baffle 402 to move up and down through a driving connection assembly. The driving connection assembly comprises a lead screw, a lead screw nut, a synchronous wheel and a synchronous belt. The synchronous wheel is connected with the lead screw nut through the synchronous belt. The motor shaft drives the synchronous wheel to rotate, so as to move the lead screw nut along the lead screw, thereby converting the rotary motion of the motor shaft of the lifting motor 401 into the linear motion of up and down. This is a prior art and will not be described in detail. The connecting baffle 402 is fixed on the lead screw nut to move synchronously. Two supporting plates 403 are vertically fixed on the connecting baffle 402 and extend outwardly and straightly from inside to outside. Two positioning blocks 404 are asymmetrically arranged on the top surfaces of the two supporting plates 403. The bottom of the supporting plate 201 is provided with positioning holes 206 which can be inserted with the positioning blocks 404. When the trolley 2 is inserted into the feeding and discharging station 100, the lifting motor 401 drives the connecting baffle 402 to move upward, so that the positioning blocks 404 are clamped with the positioning holes 206, thereby completing the butt joint with the trolley 2. The trolley 2 is stably butt jointed with the supporting plates 403, so that the lifting mechanism can drive the trolley 2 to move up and down to realize feeding or discharging.

[0036] AsFigure 1 、 Figure 2 and Figure 8 As shown in

[0037] Further, as shown in Figure 8 and Figure 9 The rear side of the feeding and discharging station 100 is provided with a position detector 5, the trigger end 501 of which is opposite to the front side of the supporting plate 201; the left or right side of the bottom of the feeding and discharging station 100 is provided with a positioning cylinder 6, the cylinder end of which is opposite to the side of the supporting plate 201; the side of the supporting plate 201 is provided with a limiting through slot 207 matched with the cylinder end of the positioning cylinder 6; when the trolley 2 is inserted into the feeding and discharging station 100, the front side of the trolley 2 abuts against the trigger end 501 to trigger the position detector 5, the position detector 5 controls the cylinder end of the positioning cylinder 6 to extend and be clamped into the limiting through slot 207, and at the same time controls the lifting mechanism motor 401 to drive the connecting baffle 4 to move upward and be connected with the trolley 2. The position detector 5 and the positioning cylinder 6 can jointly cooperate with the lifting mechanism to realize the automatic operation of controlling the lifting of the trolley 2, so as to facilitate the improvement of the automation degree and efficiency of feeding and discharging.

[0038] As shown in Figure 6As shown, the separation mechanism includes a first component and a second component which are identical in structure and symmetrically arranged, and each of the first component and the second component includes a first connecting plate 701 and a second connecting plate 702. The bottom of the first connecting plate 701 is slidably arranged on the rack 1 through a horizontal air cylinder 703, and a vertical air cylinder 705 is vertically arranged at the bottom of the first connecting plate 701 to synchronously translate. The cylinder end of the vertical air cylinder 705 is fixedly connected to the bottom center of the second connecting plate 702 to drive the second connecting plate 702 to vertically move relative to the first connecting plate 701. The top of the first connecting plate 701 and the top of the second connecting plate 702 are respectively provided with a first limiting block 704 and a second limiting block 706 which extend inwardly and horizontally. There are equidistant intervals between the side edges of the trays 200 or between the side edges of the trays 200 and the supporting plates 201. The horizontal air cylinder 703 drives the first component and the second component to synchronously move relative to the two sides of the trays 200, so that the first limiting block 704 and the second limiting block 706 are simultaneously inserted into the first interval at the top. The vertical air cylinder 705 drives the second connecting plate 702 to move upward, so that the second limiting block 704 lifts the tray 200 at the bottom, and the separation between the trays 200 or between the trays 200 and the supporting plates 201 is realized. In order to ensure the stability of the movement of the second connecting plate 702, a guide rod is arranged between the first connecting plate 701 and the second connecting plate 702.

[0039] In order to facilitate description, the tray 200 located at the first position from top to bottom is defined as the "first tray", and the tray 200 located at the second position is defined as the "second tray". The "first limiting block 704 and the second limiting block 706 are simultaneously inserted into the first interval at the top" means that the second limiting block 706 is located at the bottom of the side edge of the first tray, and the first limiting block 704 is located at the top of the side edge of the second tray. When the vertical air cylinder 705 drives the second connecting plate 702 to move upward, the second limiting block 704 lifts the first tray, and the separation between the first tray and the second tray is realized. The separation mechanism can be matched with the clamp 3 to quickly clamp the tray 200, and the trays 200 are prevented from being attracted together to cause transplanting difficulty.

[0040] As Figure 7As shown, the clamp 3 includes a first clamping arm and a second clamping arm with the same structure and symmetrically arranged. The first clamping arm and the second clamping arm are both slidably mounted on the moving track 301 via sliding connecting plates 302. The two sliding connecting plates 302 are connected by connecting strips 303 and driven to move synchronously by a drive motor 304. The first clamping arm and the second clamping arm each include a clamping plate 305 and a clamping cylinder 306. The clamping cylinder 306 is disposed on the sliding connecting plate 302 and drives the clamping plate 305 to translate relative to the front and rear sides of the material tray 200 to clamp or release the material tray 200.

[0041] Furthermore, both the first clamping arm and the second clamping arm include two clamping plates 305, which are respectively disposed at two corners on one side of the material tray 200. The inner side of the clamping plate 305 is fixed with a locking block 306 that matches the corner of the material tray 200 to achieve a better clamping effect and reduce wear on the material tray 200.

[0042] like Figure 2 As shown, in a preferred embodiment, the frame 1 of this solution is provided with three loading and unloading stations 100. Each of the three loading and unloading stations 100 accommodates two carts 2 stacked with material trays 200 and one empty cart 2 at a time, allowing loading and unloading to be achieved through a rotating transfer mechanism, thereby further improving loading and unloading efficiency. Of course, in other feasible embodiments, the frame 1 is not limited to having three loading and unloading stations 100; more than three loading and unloading stations 100 can be provided for rotating operation. The transfer mechanism in this solution is also not limited to one and can be increased according to the number of loading and unloading stations 100.

[0043] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0044] The detailed descriptions listed above are merely specific descriptions of feasible implementations of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementations or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pallet feeding system for trolleys, characterised in that: The application relates to a material loading and unloading device, which comprises a rack (1), at least two loading and unloading stations (100) provided in the rack (1) and containing trolleys (2), a transplanting mechanism and a mechanical hand (8), a group of material trays (200) can be stacked in the trolley (2) layer by layer, a lifting mechanism for driving the trolley (2) to lift is arranged in the loading and unloading station (100), and a separation mechanism is arranged on the top of the loading and unloading station (100) and located on the left and right sides of the trolley (2) for separating the material trays (200); the transplanting mechanism comprises a moving track (301) arranged above a group of the loading and unloading stations (100) and a clamp (3) which translates along the moving track (301), the clamp (3) is located above the separation mechanism and on the front and back sides of the material tray (200) and is used for clamping the material tray (200) separated by the separation mechanism, the mechanical hand (8) picks up the material in the material tray (200) clamped by the clamp (3), and the material tray (200) is switched between two loading and unloading stations (100) through the translation of the clamp (3).

2. The pallet feeding system for a trolley according to claim 1, characterized in that: The trolley (2) comprises a supporting plate (201), rollers (202) and a handle (203), a group of the rollers (202) are arranged at the bottom of the supporting plate (201), the handle (203) is detachably inserted into the side of the supporting plate (201) through a bolt (204), the supporting plate (201) is matched with the material tray (200), and a group of limiting blocks (205) matched with the bottom of the material tray (200) are arranged on the supporting plate (201) to limit the material tray (200).

3. The pallet feeding system for a trolley as claimed in claim 2, characterized in that: The lifting mechanism comprises a lifting motor (401), a connecting baffle (402) and supporting plates (403), the lifting motor (401) is arranged on the rack (1), a motor shaft of the lifting motor (401) drives the connecting baffle (402) to lift up and down, two supporting plates (403) are vertically fixed on the connecting baffle (402) and extend outwardly and horizontally from inside to outside, a positioning block (404) is asymmetrically arranged on the top surface of each of the two supporting plates (403), a positioning hole (206) matched with the positioning block (404) is arranged at the bottom of the supporting plate (201), when the trolley (2) is inserted into the loading and unloading station (100), the lifting motor (401) drives the connecting baffle (402) to move upwards so that the positioning block (404) is clamped with the positioning hole (206), and the connection with the trolley (2) is completed.

4. The pallet feeding system for a trolley according to claim 3, characterized in that: The front side of the loading and unloading station (100) is open and connected with a door plate (101), the left and right sides of the loading and unloading station (100) are provided with limiting plates (102), and the rear side of the loading and unloading station (100) is provided with the lifting mechanism, the inner side of the door plate (101) is provided with a limiting vertical rod (103) matched with the rear side of the trolley (2), when the door plate (101) is closed, the left and right positions of the trolley (2) are defined by the two limiting plates (102), and the front and rear positions of the trolley (2) are defined by the connecting baffle (402) and the limiting vertical rod (103).

5. The pallet feeding system for a trolley as claimed in claim 4, wherein: The rear bottom of the feeding and discharging station (100) is provided with a position detector (5), the triggering end (501) of which is opposite to the front side of the supporting plate (201); the bottom left or right side of the feeding and discharging station (100) is provided with a positioning cylinder (6) with the cylinder end opposite to the side of the supporting plate (201); the side of the supporting plate (201) is provided with a limiting through slot (207) matched with the cylinder end of the positioning cylinder (6); when the dolly (2) is inserted into the feeding and discharging station (100), the front side of the dolly (2) abuts against the triggering end (501) to trigger the position detector (5); the position detector (5) controls the cylinder end of the positioning cylinder (6) to extend into the limiting through slot (207), and controls the lifting motor (401) to drive the connecting baffle (402) to move upward and abut against the dolly (2) at the same time.

6. The pallet feeding system for a trolley according to claim 5, characterized in that: The separation mechanism comprises a first assembly and a second assembly which are symmetrically arranged and have the same structure, and each of the first assembly and the second assembly comprises a first connecting plate (701) and a second connecting plate (702). The bottom sides of the first connecting plate (701) are slidably arranged on the rack (1) by a horizontal cylinder (703), and a vertical cylinder (705) is vertically arranged at the bottom of the first connecting plate (701) to synchronously translate. The cylinder end of the vertical cylinder (705) is fixedly connected with the bottom center of the second connecting plate (702) to drive the second connecting plate (702) to vertically move relative to the first connecting plate (701). The top of the first connecting plate (701) and the top of the second connecting plate (702) are respectively provided with a first limiting block (704) and a second limiting block (706) which extend inwardly and horizontally. The side between two adjacent trays (200) or the side between the tray (200) and the supporting plate (201) has an equidistant interval. The horizontal cylinder (703) drives the first assembly and the second assembly to synchronously move relative to the two sides of the tray (200) to simultaneously insert the first limiting block (704) and the second limiting block (706) into the first interval at the top. The vertical cylinder (705) drives the second connecting plate (702) to move upward to lift the tray (200) at the bottom, thereby separating the two adjacent trays (200) or the tray (200) and the supporting plate (201).

7. The pallet feeding system for a trolley as claimed in claim 6, characterized in that: The clamp (3) comprises a first clamp arm and a second clamp arm which are identical in structure and symmetrically arranged, the first clamp arm and the second clamp arm are both slidably arranged on the moving track (301) through a sliding connecting plate (302), the two sliding connecting plates (302) are connected through a connecting strip (303) and synchronously moved by a driving motor (304), the first clamp arm and the second clamp arm both comprise a clamp plate (305) and a clamping cylinder (306), the clamping cylinder (306) is arranged on the sliding connecting plate (302) and drives the clamp plate (305) to translate relative to the front and back sides of the tray (200) to clamp or release the tray (200).

8. The pallet feeding system for a trolley according to claim 7, characterized in that: The first clamp arm and the second clamp arm both comprise two clamp plates (305), the two clamp plates (305) are separately arranged at two corner edges on one side of the tray (200), and the inner side of the clamp plate (305) is fixedly provided with a clamping block matched with the corner edge of the tray (200).

9. The pallet feeding system for a pallet car according to any one of claims 1 to 8, characterized in that: The rack (1) is provided with three feeding and discharging stations (100), and each of the three feeding and discharging stations (100) accommodates two trolleys (2) stacked with trays (200) and one empty trolley (2) at a time, so that feeding and discharging can be realized by rotating and switching the transplanting mechanism.

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