CN113678671B - Automatic tray placing device for greenhouse with seedling tray - Google Patents

Abstract

The invention belongs to the technical field of transplanting seedlings in greenhouses. The purpose is to provide an automatic tray placement device for greenhouse with seedling trays. The tray placement device should integrate the functions of greenhouse tray acquisition, transportation, and tray placement, and has the characteristics of simple structure, low cost, good tray placement effect, and labor-saving. The technical solution is: an automatic tray placement device with seedling trays in a greenhouse, characterized in that it includes a frame, arranged sequentially from top to bottom, and can slide vertically along the frame to transport several trays that are lifted, turned, and transported Mechanism, a positioning mechanism installed on the frame and positioning the vertical position of each tray lifting and turning conveying mechanism, and a hole arranged directly below each tray lifting and turning conveying mechanism so as to reset the position of each tray lifting and turning conveying mechanism The reset mechanism of the tray transport rack and the tray transfer and release mechanism located at the lower part of the outlet side of each tray lifting and turning conveying mechanism to receive the trays.

Description

An automatic device for placing seedling trays in a greenhouse

technical field

The invention belongs to the technical field of transplanting seedlings in greenhouses, in particular to an automatic placing device for seedlings in greenhouses.

Background technique

During the transplanting process or before transplanting the seedlings in the greenhouse, a plate of seedlings with good growth should be placed on the tray conveyor belt, transported to the designated position by the tray conveyor belt, and then transplanted at the fixed point . The plug seedlings are placed on racks with different heights before being placed on the plug conveyor belt. The traditional method is still to manually take out the plug trays with different layer heights one by one and put them on the plug conveyor belt; The labor intensity is high, the efficiency is low, and in the case of the high transplanting efficiency of the transplanting hand and the fast operation of the tray conveyor belt, manual handling alone is far from meeting the transplanting requirements. In recent years, a small number of tray transfer trolleys have appeared on the market to replace manual labor; however, most of the existing machinery still mainly lifts the entire tray transfer trolley directly. Layer seedlings are transported to the transfer trolley, and finally the transfer trolley is transported to the corresponding conveyor belt, so as to realize the sequential placement of the seedling trays in the greenhouse. The effect of this type of mechanical tray placement is average, and there are disadvantages such as only one tray can be placed at a time, the process is complicated, the efficiency is low, and other auxiliary sprockets are needed for transportation.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the background technology, and to provide a device for automatically placing trays with seedlings in a greenhouse. It has the characteristics of good effect and saving manpower.

The technical scheme provided by the invention is:

An automatic placing device for seedling trays in a greenhouse, characterized in that it includes a frame, arranged in sequence from top to bottom and can vertically slide along the frame to transport several tray lifting and turning conveying mechanisms, installed on The positioning mechanism for positioning the vertical position of each tray lifting and turning conveying mechanism on the frame, and the tray conveying frame reset that is arranged directly below each tray lifting and turning conveying mechanism so as to reset the position of each tray lifting and turning conveying mechanism Mechanism and the tray transfer and release mechanism located at the lower part of the exit side of each tray lifting and turning conveying mechanism to receive the trays.

The tray lifting and turning conveying mechanism includes a sliding frame that is vertically slidably connected with the frame and matched with a positioning mechanism, a power roller conveyor that can swing around a horizontal axis and is positioned inside the sliding frame, and is fixed on the sliding frame to drive A plurality of overturning cylinders for the power roller conveyor to swing; the swing axis of the power roller conveyor is perpendicular to the conveying direction of the power roller conveyor.

The positioning mechanism includes two support frames symmetrically arranged on the left and right sides of each tray lifting and turning conveying mechanism, a number of tray frame side fixing parts symmetrically arranged on the front and rear sides of each tray lifting and turning conveying mechanism, and for driving The support frame and the side fixing parts of the tray rack alternately support the drive assembly of each tray lifting and turning conveying mechanism; the side fixing parts of the tray rack are arranged horizontally and the two ends are respectively slidably positioned on the two supporting frames; The quantity of the side fixing parts of the tray frame on the side is the same as the quantity of the tray lifting and turning conveying mechanism.

The support frame includes a door-shaped bracket fixedly connected to the frame, a number of expansion plate fixing shafts horizontally fixed on the bracket along the front and rear directions, and a number of crescent plate fixing shafts positioned on the bracket rotatably around its own axis; The number of the fixed shafts of the spreader plate and the fixed shafts of the crescent plate is the same as the number of the tray lifting and turning conveying mechanism, and the fixed shafts of the spreader plate and the fixed shafts of the crescent plate are parallel to each other and arranged alternately from top to bottom; A number of expansion plates are slidably positioned in the middle of the plate fixing shaft; two groups of the expansion plates are combined and driven by the driving mechanism to approach or move away from each other; the two ends of the expansion plate fixing shaft are respectively fixed with positioning shaft caps; At least two crescent plates for supporting the lifting and turning conveying mechanism of the trays are fixed on the fixed shaft of the crescent plates.

The two ends of the fixed shaft of the expansion plate extend outwards through the bracket respectively to form an extension section; the side fixing frame of the tray holder is slidably positioned on the extension section of the fixed shaft of the expansion plate; the positioning shaft cap A compression spring is sleeved on the fixed shaft of the expansion plate between the side fixing parts of the tray frame; shaft sleeve.

The drive assembly includes a vertically arranged conical block power shaft, a conical block fixed on the conical block power shaft and corresponding to the position of the spreader plate, a pressing shaft horizontally fixed on the conical block power shaft, and Vertically fixed on the support to drive the drive cylinder for the vertical movement of the power shaft of the conical block; the sides of the pressing shaft and the slide frame are all corresponding to the position of the crescent plate.

The tray transfer and release mechanism includes a mounting frame, a non-powered roller conveyor that can swing around a horizontal axis and is positioned on the mounting frame, a number of lifting cylinders that are vertically fixed on the mounting frame to drive the non-powered roller conveyor to swing, The limiting plate that is rotatably positioned at the outlet end of the unpowered roller conveyor to buffer the tray, the driving motor that is fixed on the mounting frame and drives the limiting plate to turn over, and the push cylinder that is horizontally fixed on the frame and drives the mounting frame to move .

The reset mechanism of the tray conveying frame includes a reset plate that can slide vertically along the frame, a number of reset profiles fixed on the reset plate to support the tray lifting and turning conveying mechanism, and fixed on the frame to drive the reset plate to move vertically. reset cylinder.

A gas spring for buffering is installed at the bottom of the power roller conveyor; a buffer wheel is rotatably positioned at the exit of the power roller conveyor.

The inner walls of the powered roller conveyor and the non-powered roller conveyor are both provided with sensors.

The beneficial effects of the present invention are:

The invention drives each tray lifting and turning conveying mechanism to fall layer by layer through the support structure, transports the trays through each tray lifting and turning conveying mechanism, receives the trays in turn through the tray transfer mechanism, and resets the tray through the tray transport frame. The lifting and turning conveying mechanism of each tray is reset, so as to realize the continuous transfer and release operation of the greenhouse seedlings, optimize the bulky mechanical structure, improve the effect of placing the trays, and ensure the timely continuation of the greenhouse seedlings. In addition, multi-stage buffering is carried out by gas springs and buffer wheels, which prevents the seedlings in the tray from being damaged due to too much impact during the falling process of the tray lifting and turning conveying mechanism. The whole machine is relatively light, the power transmission is simple, the cost is low, the labor intensity of manual disk placement is greatly reduced, the degree of automation is high, and it is suitable for popularization and application.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.

Fig. 2 is one of the three-dimensional structural schematic diagrams of the support mechanism of the present invention.

Fig. 3 is the second schematic view of the three-dimensional structure of the supporting mechanism of the present invention.

Fig. 4 is one of the three-dimensional structural schematic diagrams of the lifting and turning conveying mechanism of the tray according to the present invention.

Fig. 5 is the second schematic diagram of the three-dimensional structure of the tray lifting and turning conveying mechanism according to the present invention (hidden sliding frame).

Fig. 6 is a schematic diagram of the three-dimensional structure of the tray transfer mechanism according to the present invention.

Fig. 7 is a three-dimensional structural schematic diagram of the reset mechanism of the tray transport rack according to the present invention.

Reference signs:

1. Rack;

2. Tray lifting and turning conveying mechanism; 2-1, sliding frame; 2-2, sliding rail; 2-3, sliding block; 2-4, power roller conveyor; 2-5, first gas spring; 2- 6. Flip cylinder; 2-7, limit roller; 2-8, buffer wheel; 2-9, first sensor; 2-10, isolation profile;

3. Positioning mechanism; 3-1. Fixing piece on the side of the tray frame; 3-2. The fixed shaft of the expansion plate; 3-3. The expansion plate; 3-4. The fixed shaft of the crescent plate; 3-5. The crescent Plate; 3-6, shaft side fixed plate; 3-7, cylinder fixed plate; 3-8, positioning shaft cap; 3-9, compression spring; 3-10, conical block power shaft; 3-11, conical block; 3-12, compression shaft; 3-13, drive cylinder; 3-14, four-way connector; 3-15, shaft sleeve;

4. The reset mechanism of the hole tray conveying frame; 4-1, the reset plate; 4-2 the reset cylinder; 4-3, the reset profile; 4-4, the reset cylinder fixed plate;

5. Tray transfer mechanism; 5-1. Mounting frame; 5-2. Unpowered roller conveyor; 5-3. Lifting cylinder; 5-4. Limiting plate; 5-5. Drive motor; 5- 6. Push the cylinder; 5-7, the second sensor; 5-8, the second gas spring;

6. Roller;

7. Cave plate.

Detailed ways

Further description will be given below in conjunction with the embodiments shown in the accompanying drawings.

As shown in Figure 1, the automatic tray-setting device with seedling trays in a greenhouse includes a frame 1, a plurality of tray lifting and turning conveying mechanisms 2, a positioning mechanism 3, a tray transport frame reset mechanism 4, and a tray transfer mechanism 5 . In this embodiment, the frame has four layers, and each layer is provided with a lifting and turning conveying mechanism for the tray. Rollers 6 are installed at the bottom of the frame.

As shown in Figures 1 to 5, four tray lifting and turning conveying mechanisms are arranged sequentially from top to bottom; each tray lifting and turning conveying mechanism includes a sliding frame 2-1, a power roller conveyor 2-4 and several ( Be 2 among the figure) overturn cylinder 2-6. The sliding frame can vertically slide along the frame through the sliding pair, wherein the sliding pair is composed of a slide rail 2-2 fixed on the frame and a slide block 2-3 fixed on the sliding frame; The positions of the mechanisms are corresponding, so that the positioning mechanism supports the entire tray lifting and turning conveying mechanism through the sliding frame. The power roller conveyor can be oscillated around the horizontal axis and positioned inside the sliding frame, wherein the swing axis of the power roller conveyor is perpendicular to the conveying direction of the power roller conveyor; the bottom of the power roller conveyor is installed with a first Gas spring 2-5, can not destroy the seedling in the hole plate because of too big impact in the process of falling layer by layer to ensure that the hole plate lifting and turning conveying mechanism. The cylinder body of the turning cylinder is fixed on the sliding frame and its push rod is fixedly connected with the bottom of the power roller conveyor to drive the power roller conveyor to swing. When the tray is transported, the tray 7 is placed on the power roller conveyor, and then the cylinder is turned over to drive the power roller conveyor to turn over and tilt at an appropriate angle, and the power roller conveyor is started, so that the tray is transported from the outlet of the power roller conveyor to the hole. Disk transfer mechanism. As a preference, the inner wall of the power roller conveyor is rotatably provided with limit rollers 2-7 for pressing the edge of the tray, and buffer wheels 2-8 are rotatably positioned on both sides of the outlet of the power roller conveyor , to ensure the stability of the tray transport; the inner wall of the power roller conveyor is provided with a first sensor 2-9 to detect the transport status of the tray on the power roller conveyor.

As shown in Figure 2 and Figure 3, the positioning mechanism is installed on the frame, and the positioning mechanism cooperates with each tray lifting and turning conveying mechanism to support and position each tray lifting and turning conveying mechanism. The positioning mechanism includes two support frames, several tray frame side fixing parts 3-1 and a drive assembly. Two supporting frames are symmetrically arranged on the left and right sides of each tray lifting and turning conveying mechanism. The front and rear sides of each tray lifting and turning conveying mechanism are symmetrically provided with the side fixing parts of the tray rack, and the quantity of the side fixing parts of the tray rack on each side is the same as the quantity of the tray lifting and turning conveying mechanism (that is, each side The side fixing parts of the tray frame are all four); the side fixing parts of the tray frame are arranged horizontally and the two ends are respectively slidably positioned on the two support frames; during work, the sides of the tray rack on both sides Driven by the driving assembly, the side fixing parts can move toward each other along the front and rear directions. The driving assembly is installed on the supporting frame, and is used to drive the supporting frame and the side fixing parts of the tray frame to alternately support the lifting and turning conveying mechanism of each tray.

Each bracing frame all comprises bracket, some spreader plate fixing shafts 3-2, some spreader plates 3-3, some crescent plate fixing shafts 3-4 and some crescent plates 3-5. The support is arranged in a door shape, and the support includes two shaft-side fixing plates 3-6 vertically fixed on the frame at intervals and a cylinder fixing plate 3-7 horizontally connecting the top of the two shaft-side fixing plates. The fixed shaft of the expansion plate is arranged horizontally along the front and rear direction, and the two ends are respectively fixed on the two shaft-side fixing plates; The extension section is used for slidingly connecting the side fixing frame of the tray holder. A plurality of the spreader plates are slidably positioned in the middle of the fixed shaft of the spreader plates; two sets of the spreader plates are driven by a driving mechanism to approach or move away from each other. Positioning shaft caps 3-8 are respectively fixed at the two ends of the fixed shaft of the spreader plate, so as to prevent the tray frame side fixing frame from slipping off from the extension; between the positioning shaft cap and the tray frame side fixing parts The expansion plate fixed shaft is sleeved with compression spring 3-9. A shaft sleeve 3-15 sleeved on the fixed shaft of the expansion plate is arranged between the expansion plate and the side fixing part of the tray frame. The fixed shaft of the crescent plate can be rotatably positioned on the support around its own axis; the number of fixed shafts of the crescent plate and the fixed shaft of the expansion plate are all the same as the number of the tray lifting and turning conveying mechanisms (all are four), and the crescent plate The fixed shafts and the fixed shafts of the expansion plates are parallel to each other and arranged alternately from top to bottom. At least two crescent plates are fixed on the fixed shaft of the crescent plates, and the crescent plates can support the lifting and turning conveying mechanism of the supporting tray.

In this embodiment, two groups of driving assemblies are arranged on the side close to the outlet of the tray lifting and turning conveying mechanism, and the distance between the two groups of driving assemblies is greater than the width of the power roller conveyor, so as to prevent the trays from being separated from each other during the conveying process. Interference occurs in the driving components; a group of driving components is arranged in the middle of the side far away from the lifting and turning conveying mechanism of the tray.

Every group of driving assemblies all comprises conical block power shaft 3-10, several conical blocks 3-11, pressing shaft 3-12 and driving cylinder 3-13. The power axis of the conical block is arranged vertically. The number of the conical blocks is the same as the number of the tray lifting and turning conveying structure (that is, each group of drive components includes four conical blocks), and each conical block is fixed on the power shaft of the conical block and combined with each two The positions of the expansion plates correspond to each other one by one. The pressing shaft is horizontally fixed on the power shaft of the conical block through a four-way connector 3-14. The driving cylinder is arranged vertically, wherein the cylinder body of the driving cylinder is fixed on the cylinder fixing plate and its push rod is fixedly connected with the power shaft of the conical block to drive the power shaft of the conical block to move vertically. Both the pressing shaft and the conveying frame correspond to the position of the crescent plate. In this embodiment, there are four conical block power shafts in total, and the four conical block power shafts are located on the same vertical line, wherein the uppermost conical block power shaft is connected to the driving cylinder, and the remaining three conical block power The shaft can pass through the expansion plate to fix the shaft; when working, the drive cylinder drives the power shaft of the uppermost conical block to move downward, and the conical block touches the lower conical block to fix the shaft, so that each conical block fixes the shaft The same distance is moved vertically downwards successively; the fixed shafts of each tapered block can also be integrally connected.

The above support mechanism works as follows:

During the initial position, each pressing shaft and each sliding frame are all compressed on the corresponding crescent plate to form a dynamic balance. At this time, the crescent plate is clamped, and each tray lifting and turning conveying mechanism is positioned on the crescent plate. When the trays are transported, the driving cylinder shrinks, and the power shaft of each conical block moves upward, so that all the clamped crescent plates are released, the sliding frame loses balance, and the lifting and turning conveying mechanism of each tray gradually falls under the action of gravity. At this time, all the conical blocks are above the corresponding expansion plates, and the distance between the support plates combined in pairs is the closest. The tray delivery rack is just stuck on the side fixing parts of the tray rack on both sides below. Then the turnover cylinder of the lowermost layer of tray lifting and turning conveying mechanism acts, and the layer of tray lifting and turning conveying mechanism is turned and tilted. Under the action of the power roller conveyor, the layer of greenhouse seedlings is transported to the tray transfer mechanism. After the work of conveying the bottom hole tray is completed, the driving cylinder extends downward, and the power shaft of each conical block moves downward, so that each conical block gradually moves downward and is under the corresponding expansion plate. At this time, two or two The distance between the combined support plates is the farthest. The side fixing parts of the tray frame overcome the elastic force of the compression spring and move away from each other. , the lowermost tray lifting and turning conveying mechanism falls directly on the tray conveying rack reset mechanism, and at this time the pressing shaft is pressed against the crescent plate again, so that the remaining three layers of tray lifting and turning conveying mechanism on the upper side fall to the bottom. On the crescent plate, the crescent plate is clamped tightly, and the flipping cylinder in the lowermost tray lifting and turning conveying mechanism moves, thereby transporting the second tray of greenhouse seedlings to the tray transfer mechanism. Repeating the above actions can realize the purpose of moving downward layer by layer between the lifting and turning conveying mechanisms of each tray and transporting the seedlings of the trays sequentially.

As shown in FIG. 6 , the tray transferring and placing mechanism is arranged at the lower part of the exit side of each tray lifting and turning conveying mechanism for receiving the trays. The tray transfer and release mechanism includes a mounting frame 5-1, an unpowered roller conveyor 5-2 (available for purchase), several (two in the figure) lifting cylinders 5-3, and a limit plate 5-4 , drive motor 5-5 and promote cylinder 5-6. Rollers 6 are installed at the bottom of the mounting frame. The unpowered roller conveyor can be swingably positioned on the mounting frame around the horizontal axis; the side wall of the unpowered roller conveyor is provided with a second sensor 5-7 to detect the conveying status of the tray on the unpowered roller conveyor; The bottom of the unpowered roller conveyor is equipped with a second gas spring 5-8, which can buffer the trays falling on the unpowered roller conveyor. The lifting cylinder is vertically fixed on the mounting frame to drive the unpowered roller conveyor to swing; the limit plate is rotatably positioned at the outlet end of the unpowered roller conveyor for buffering the tray; the driving motor It is fixed on the installation frame and its output shaft is fixedly connected with the limit plate to drive the limit plate to turn over; the push cylinder is set horizontally, and the cylinder body of the push cylinder is fixed on the frame and its push rod is fixedly connected with the mount frame . When working, the unpowered roller conveyor receives the tray, and the lifting cylinder drives the unpowered roller conveyor to swing at an appropriate angle and then tilts. Under the action of gravity, the tray is transported to the limit plate for buffering, and then drives the motor to drive the limit plate. The positioning plate is turned over, so that the trays slide out from the exit of the unpowered roller conveyor to the external conveyor belt (not shown in the figure), and the automatic tray placement operation is completed.

As shown in Figure 7, the tray transport frame reset mechanism is installed on the frame and is located directly below each tray lifting and turning conveying mechanism, so as to reset the position of each tray lifting and turning conveying mechanism, so as to ensure that the device continues to put trays Operation. The reset mechanism of the tray transport rack includes a reset plate 4-1 and a reset cylinder 4-2. The reset plate can slide vertically along the frame; the reset plate is provided with a number of reset profiles 4-3, and the reset profiles correspond to the isolation profiles 2-1 at the bottom of the sliding frame; When it reaches the lowest position, it is just supported by the reset profile, so that there is a certain distance between the lowermost tray lifting and turning conveying mechanism and the reset plate, so as to ensure the smooth reset of subsequent tray lifting and turning conveying mechanisms. The reset cylinder is vertically arranged, wherein the cylinder body of the reset cylinder is fixed on the frame by the reset cylinder fixing plate 4-4 and its push rod is fixedly connected with the reset plate to drive the reset plate to move vertically. When all the lifting and turning conveying mechanisms of the trays are lowered to the reset plate, the reset cylinder pushes the lifting and turning conveying mechanisms of the trays to move upwards. The fixing parts are far away from each other, and at the same time, the crescent plates are loosened, so as to ensure that the upward movement of the lifting and turning conveying mechanism of each tray will not be hindered. After the lifting and turning conveying mechanism of each tray rises to the height of the initial position, the driving cylinder shrinks, so that each pressing shaft presses the crescent plate, and then the reset cylinder shrinks, and the lifting and turning conveying mechanism of each tray can be clamped on the crescent plate , to realize the reset action of each tray lifting and turning conveying mechanism.

The working principle of the present invention is:

When working, the seedlings in the plug trays are placed on the tray lifting and turning conveying mechanism between different layers, and then the positioning mechanism drives each tray lifting and turning conveying mechanism to fall layer by layer, and the trays are transferred to the tray transfer turning mechanism to complete the hole The lifting and turning conveying mechanism of the trays transported by the trays will descend to the reset mechanism of the tray conveying frame. Resetting is performed to realize continuous tray placement, which greatly improves the tray tray placement efficiency.

Finally, it should be noted that what is listed above are only specific embodiments of the present invention. Apparently, the present invention is not limited to the above embodiments, and there may be multiple modifications, for example, the lifting and turning conveying mechanism of the trays may be set to five layers or above. All deformations that can be directly derived or associated by those skilled in the art from the content disclosed in the present invention should be considered as the protection scope of the present invention.

Claims (3)

1. An automatic tray-discharging device with seedling trays in a greenhouse, characterized in that it includes a frame (1), which is arranged sequentially from top to bottom and can slide vertically along the frame to transport several holes of the tray (7) Tray lifting and turning conveying mechanism (2), positioning mechanism (3) installed on the frame and positioning the vertical position of each tray lifting and turning conveying mechanism, arranged directly below each tray lifting and turning conveying mechanism so that each tray The tray conveyor rack reset mechanism (4) for resetting the position of the lifting and turning conveying mechanism, and the tray transfer and releasing mechanism (5) located at the lower part of the outlet side of each tray lifting and turning conveying mechanism to receive the trays; The positioning mechanism includes two support frames symmetrically arranged on the left and right sides of each tray lifting and turning conveying mechanism, and several tray frame side fixing parts (3-1) symmetrically arranged on the front and rear sides of each tray lifting and turning conveying mechanism ) and a driving assembly for driving the support frame and the side fixing parts of the tray rack to alternately support each tray lifting and turning conveying mechanism; the side fixing parts of the tray rack are arranged horizontally and the two ends are slidably positioned on two On the support frame; the number of fixing parts on the side of the tray frame on each side is the same as the number of the tray lifting and turning conveying mechanism; The support frame includes a door-shaped bracket fixedly connected to the frame, several expansion plate fixing shafts (3-2) horizontally fixed on the bracket along the front and rear directions, and several crescents positioned on the bracket rotatably around their own axes. Plate fixing shafts (3-4); the number of the spreading plate fixing shafts and the crescent plate fixing shafts is the same as the number of the tray lifting and turning conveying mechanism, and the spreading plate fixing shafts and the crescent plate fixing shafts are parallel to each other and from Arranged alternately from top to bottom; the middle part of the fixed shaft of the expansion plate is slidably positioned with a number of expansion plates (3-3); two groups of the expansion plates are driven by the driving mechanism to approach or move away from each other; the Positioning shaft caps (3-8) are respectively fixed to the two ends of the fixed shaft of the spreading plate; at least two crescent plates (3-5) for supporting the lifting and turning conveying mechanism of the tray are fixed on the fixed shaft of the crescent plate; The two ends of the fixed shaft of the expansion plate extend outwards through the bracket respectively to form an extension section; the side fixing frame of the tray holder is slidably positioned on the extension section of the fixed shaft of the expansion plate; the positioning shaft cap A compression spring (3-9) is sheathed on the fixing shaft of the expansion plate between the side fixing parts of the tray frame; Sleeve (3-15) on the fixed shaft of the plate; The driving assembly includes a vertically arranged conical block power shaft (3-10), a conical block (3-11) fixed on the conical block power shaft and corresponding to the position of the expansion plate, and a horizontally fixed conical block The pressing shaft (3-12) on the shaped block power shaft and the drive cylinder (3-13) vertically fixed on the bracket to drive the vertical movement of the tapered block power shaft; the side of the pressing shaft and the sliding frame The sides correspond to the position of the crescent plate; The tray lifting and turning conveying mechanism includes a sliding frame (2-1) vertically slidably connected with the frame and matched with a positioning mechanism, and a power roller conveyor (2-1) positioned inside the sliding frame so as to swing around a horizontal axis. 4) and a number of turning cylinders (2-6) fixed on the sliding frame to drive the power roller conveyor to swing; the swing axis of the power roller conveyor is perpendicular to the conveying direction of the power roller conveyor; The tray transfer mechanism includes a mounting frame (5-1), an unpowered roller conveyor (5-2) positioned on the mounting frame that can swing around a horizontal axis, and is vertically fixed on the mounting frame to drive an unpowered roller conveyor. A number of lifting cylinders (5-3) for the swing of the powered roller conveyor, rotatably positioned at the outlet end of the unpowered roller conveyor to buffer the limit plate (5-4) of the tray, fixed on the mounting frame and driven to limit the position The drive motor (5-5) for board flipping and the push cylinder (5-6) that is horizontally fixed on the frame and drives the movement of the mounting frame; The reset mechanism of the tray transport rack includes a reset plate (4-1) that can slide vertically along the frame, several reset profiles (4-2) fixed on the reset plate to support the lifting and turning transport mechanism of the tray, and fixed on the The reset cylinder (4-3) on the frame and drives the reset plate to move vertically. 2. The device for automatically placing trays with seedlings in greenhouses according to claim 1, characterized in that: the bottom of the power roller conveyor is equipped with a first gas spring (2-5) for buffering; the power roller Buffer wheels (2-8) are rotatably positioned at the outlet of the conveyor. 3. The device for automatically placing trays with seedlings in a greenhouse according to claim 2, characterized in that: the inner walls of the powered roller conveyor and the non-powered roller conveyor are both provided with sensors.

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