Conveying device and engraving and milling machine

Abstract

The utility model is applicable to the technical field of glass processing, and provides a conveying device and an engraving and milling machine, the conveying device comprises a bottom plate, the two sides of the top of the bottom plate are respectively provided with a stock bin of a frame structure, and a lifting mechanism is arranged on the bottom plate and between the two stock bins. A conveying belt extending backwards is arranged above the position between the two stock bins, and a material taking mechanism for transferring materials to the conveying belt from the interiors of the stock bins is arranged above the front end of the conveying belt. According to the conveying device, the two stock bins are alternately used, when one stock bin is used for feeding, the other stock bin can carry out material loading work, and the two stock bins carry out loading and feeding in a circulating mode, so that equipment can carry out continuous machining, and the situation that work is interrupted due to insufficient material supply is avoided; idling or shutdown of equipment caused by material loading is avoided, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of glass processing, in particular to a conveying device and a precision engraving machine. Background Art

[0002] A precision engraving machine is a type of CNC machine tool that performs non-contact cutting and drilling on metal or non-metallic sheets and pipes. The production of glass products like tempered glass for mobile phones and glass cover panels involves a series of operations, including cutting, polishing, and laminating, to create the final product. These operations require the use of a precision engraving machine.

[0003] The raw materials for the above-mentioned glass products are usually glass plates and glass sheets. The stacked raw materials need to be separated and arranged one by one so that the raw materials can be transported backward according to the specified spacing, so that the subsequent robot can grab the materials and place them in the processing position for processing.

[0004] Chinese patents CN109809187A and CN110181324A disclose a stacked glass sheet separation and positioning device and a separation and feeding device for thin sheet materials, respectively. Both devices realize automatic feeding of materials by placing stacked materials in a hopper and lifting them upward, then separating the raw materials, grabbing them one by one, and transferring them to a conveyor belt for feeding and transportation. However, each device has only one hopper. After the materials in the hopper are consumed, the lifting component needs to be reset downward, and then a stack of materials needs to be reloaded for the next round of upward feeding and transportation. During this process, the equipment is in a vacuum period and is in an idling or shutdown state. This interrupts the working process of the equipment and makes it impossible to continue processing. A lot of time is consumed in loading work, and the equipment cannot be used with maximum efficiency, which affects the processing speed and production efficiency.

[0005] At present, there are some feeding devices using a double-silo structure in the industry, but the two silos use a set of lifting equipment and transfer equipment respectively, which leads to high equipment manufacturing and use costs, and is more troublesome to maintain, and there are some inconveniences in use. Utility Model Content

[0006] The utility model provides a conveying device and a precision engraving machine, aiming to solve the problem that the existing feeding device uses a single material bin to feed materials, the equipment processing is interrupted during the loading process, and the production efficiency is affected.

[0007] The utility model is realized as follows: a conveying device comprises a bottom plate, a frame-structured silo is respectively provided on both sides of the top of the bottom plate, a lifting mechanism is provided on the bottom plate between the two silos, a conveyor belt extending backward is provided above the two silos, and a material taking mechanism for transferring materials from the silo to the conveyor belt is provided above the front end of the conveyor belt;

[0008] Each of the silos is provided with a tray assembly that can move in the vertical direction, and the lifting mechanism can be connected to a tray assembly to push the material in the corresponding silo upward;

[0009] The material-taking mechanism includes a mounting frame, a movable plate that can be moved left and right to above any material bin is provided at the bottom of the mounting frame, a pushing cylinder that drives the movable plate to move is provided at the bottom of the mounting frame, and a suction cup assembly is provided at the bottom of the movable plate.

[0010] Preferably, the suction cup assembly includes a shaftless cylinder fixedly mounted on the bottom of the movable plate, a material picking cylinder is vertically arranged at the bottom of the slider of the shaftless cylinder, a suction cup seat is arranged at the bottom end of the material picking cylinder, and a pneumatic suction cup for sucking materials is arranged at the bottom end of the suction cup seat.

[0011] Preferably, the pallet assembly includes a movable seat and a supporting rack, the movable seat is located outside the silo, the supporting rack is located inside the silo and the bottom extends outward and is fixedly connected to the movable seat, one side of the movable seat extends toward the lifting mechanism and is provided with a connecting slot, and the lifting mechanism is connected to the movable seat through the connecting slot and drives it to rise and fall.

[0012] Preferably, the lifting mechanism includes a driving motor and a threaded screw, the threaded screw is rotatably arranged vertically on the top of the base plate, the driving motor is fixedly installed on the bottom of the base plate to drive the threaded screw to rotate, the surface of the threaded screw is threadedly connected with a threaded sleeve, a moving block is fixedly installed on the threaded sleeve, a slide cylinder is provided on the rear side of the moving block, a connecting plate is fixedly installed on the slider of the slide cylinder, and both ends of the connecting plate are respectively provided with connecting protrusions that can be connected to the tray assembly.

[0013] Preferably, the silo includes a rear mounting seat, a front mounting seat, a left mounting seat and a right mounting seat arranged on the bottom plate, and a rear limit plate, a front limit plate, a left limit plate and a right limit plate are fixedly installed on the rear mounting seat, the front mounting seat, the left mounting seat and the right mounting seat respectively. The rear limit plate, the front limit plate, the left limit plate and the right limit plate form a silo cavity, and the tray assembly moves up and down in the silo cavity.

[0014] Preferably, the front mounting seat can be slidably arranged on the top of the base plate, and the left mounting seat and the right mounting seat can be slidably arranged on the top of the base plate respectively. The left mounting seat and the right mounting seat are fixedly connected to a connecting frame extending to the bottom of the base plate, and the two connecting frames are respectively fixedly connected to a rack, and the two racks are arranged opposite to each other. A gear is rotatably provided at the bottom of the base plate and located between the two racks, and the two sides of the gear are respectively engaged with a rack so that the two move synchronously in opposite directions.

[0015] A precision engraving machine comprises the above-mentioned conveying device.

[0016] Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: a conveying device of the present invention is provided with two silos for alternating use, one of which is used for feeding while the other is used for loading materials, and the two silos are used for loading and feeding in a cycle, so that the equipment can carry out continuous processing without interruption of work due to insufficient material supply, avoiding idling or shutdown of the equipment due to loading materials, and improving production efficiency;

[0018] A set of lifting mechanisms is used to drive two tray assemblies to lift and feed materials. A set of retrieving assemblies is used to adjust the position, and materials can be taken from two silos for transfer. One set of equipment can complete the feeding and retrieving work of two silos. The equipment cost is lower, the structure is simple and reasonable, and it is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a structural diagram of the material taking mechanism in the utility model;

[0021] Figure 3 This is a structural diagram of the lifting mechanism and the silo in the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the lifting mechanism in the utility model;

[0023] Figure 5 For this utility model Figure 4 A partial enlarged view of point A in the middle;

[0024] Figure 6 This is a structural diagram of the silo in the utility model;

[0025] Figure 7 This is a structural diagram of the silo in the utility model;

[0026] Figure 8 This is a structural diagram of the silo in the utility model;

[0027] Figure 9 It is a structural diagram of the rack and gear in the utility model.

[0028] In the figure: 1-base plate, 2-lifting mechanism, 21-drive motor, 22-threaded screw, 23-threaded sleeve, 24-moving block, 25-slide cylinder, 26-connecting plate, 27-connecting seat, 3-material bin, 31-rear mounting seat, 32-front mounting seat, 33-left mounting seat, 34-right mounting seat, 35-rear limit plate, 36-front limit plate, 37-left limit plate, 38-right limit plate, 39-connecting frame, 310-rack, 311-gear, 4-feeding mechanism, 41-mounting frame, 42-movable plate, 43-shaftless cylinder, 44-feeding cylinder, 45-suction cup seat, 46-pushing cylinder, 5-conveyor belt, 6-tray assembly, 61-moving seat, 62-supporting rack, 7-vertical plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] See also Figure 1-9 The utility model provides a technical solution: a conveying device, including a base plate 1, a frame-structured silo 3 is respectively provided on both sides of the top of the base plate 1, a lifting mechanism 2 is provided on the base plate 1 between the two silos 3, a conveyor belt 5 extending backward is provided above the two silos 3, and a material taking mechanism 4 for transferring materials from the silo 3 to the conveyor belt 5 is provided above the front end of the conveyor belt 5.

[0031] Each of the silos 3 is provided with a tray assembly 6 that can move in the vertical direction, and the lifting mechanism 2 can be connected to a tray assembly 6 respectively to push the material in the corresponding silo upward.

[0032] The base plate 1 can be mounted on the body of the engraving machine by means of bolts or the like, and the entire body consisting of the base plate 1, the lifting mechanism 2 and the hopper 3 can be mounted and fixed.

[0033] A group of silos 3 are respectively arranged on both sides of the top of the base plate 1. The materials are stacked on the tray assembly 6 in the silo 3. The lifting mechanism 2 drives one tray assembly 6 to rise, thereby lifting the material in the corresponding silo 3 upward. After the material is taken out by the material taking mechanism 4, it is transferred to the conveyor belt 5 for backward transportation.

[0034] The two silos 3 are used alternately. When one of them is feeding, the other can be used to load materials. When the material in the first silo 3 is consumed, the lifting mechanism 2 resets downward and connects to the tray assembly 6 in the other silo 3 that is loaded with materials, thereby driving the material in the silo 3 to move upward for feeding. At this time, the first silo 3 is loading materials, and the two silos 3 are cyclically loaded and fed, so that the equipment can carry out continuous processing, avoiding idling or shutdown of the equipment due to loading materials, and improving production efficiency.

[0035] The material-taking mechanism 4 includes a mounting frame 41, and a movable plate 42 that can be moved left and right to above any silo 3 is provided at the bottom of the mounting frame 41. A pushing cylinder 46 that drives the movable plate 42 to move is provided at the bottom of the mounting frame 41, and a suction cup assembly is provided at the bottom of the movable plate 42.

[0036] In this embodiment, the mounting bracket 41 is fixedly mounted on the engraving machine body by bolts or the like.

[0037] The movable plate 42 is slidably connected to the bottom of the mounting frame 41. The output end of the push cylinder 46 is connected to one end of the movable plate 42. The extension and contraction of the push cylinder 46 drives the movable plate 42 to move left and right, thereby changing the working position of the suction cup assembly. The movable plate 42 has two positions, left and right, to retrieve and transfer materials from different silos 3.

[0038] Furthermore, the suction cup assembly includes a shaftless cylinder 43 fixedly mounted on the bottom of the movable plate 42, a material picking cylinder 44 is vertically arranged at the bottom of the slider of the shaftless cylinder 43, a suction cup seat 45 is arranged at the bottom end of the material picking cylinder 44, and a pneumatic suction cup for sucking materials is arranged at the bottom end of the suction cup seat 45.

[0039] The pushing cylinder 46 and the taking-up cylinder 44 are supplied with air through the drag chain.

[0040] In this embodiment, the stroke of the shaftless cylinder 43 can cover the range of one of the silos 3 and the conveyor belt 5. For example, when the silo 3 on the left is in the feeding state, the pushing cylinder 46 drives the movable plate 42 to move to the left position. At this time, the left and right ends of the stroke of the shaftless cylinder 43 are respectively located above the left silo 3 and the conveyor belt 5. When the slider of the shaftless cylinder 43 slides to the left end, the pneumatic suction cup is located above the left silo 3, and then the material-picking cylinder 44 extends to drive the suction cup seat 45 to descend, thereby driving the pneumatic suction cup to descend, sucking the top layer of material and then resetting upward. Then the slider of the shaftless cylinder 43 slides to the right end, so that the pneumatic suction cup moves to above the front end of the conveyor belt 5, and then the material-picking cylinder 44 extends to move the material downward to close to the conveyor belt 5, and the pneumatic suction cup 5 releases the material and drops it onto the surface of the conveyor belt 5, which is transported backward by the conveyor belt 5.

[0041] When the material in the left silo 3 is consumed and the material in the right silo 3 is loaded, the lifting mechanism 2 drives the tray assembly 6 in the silo 3 to descend to the lowest point and reset, then disconnects from the tray assembly 6, connects to the tray assembly 6 in the right silo 3, moves upward, and lifts the material in the right silo 3 upward for feeding. At this time, the material loading operation is performed on the left silo 3.

[0042] As the material in a silo 3 is fed, the top piece of material is continuously removed. The lifting mechanism 2 continues to operate, driving the stacked material upwards, so that the top piece of material is always at the top of the silo 3 cavity, at the working height of the material removal mechanism 4. The speed of the lifting mechanism 2 can be adjusted to match the speed of material rise with the speed of material removal and transfer.

[0043] When the right silo 3 is switched to feed, the push cylinder 46 extends to drive the movable plate 42 to move to the right. The stroke of the shaftless cylinder 43 covers the conveyor belt 5 and the right silo 3. When the pneumatic suction cup moves to the right end, it descends to absorb the material, and then moves to the left to above the conveyor belt 5 after rising, and releases the material after descending.

[0044] Furthermore, the tray assembly 6 includes a movable seat 61 and a supporting rack 62, the movable seat 61 is located outside the silo 3, the supporting rack 62 is located inside the silo 3 and the bottom extends outward and is fixedly connected to the movable seat 61, one side of the movable seat 61 extends toward the lifting mechanism 2 and is provided with a connecting slot, and the lifting mechanism 2 is connected to the movable seat 61 through the connecting slot and drives it to rise and fall.

[0045] The support rack 62 includes a support rod and a tray at the top. The lower part of the support rod is bent outward and fixedly connected to the movable seat 61. The support rod is outside the inner cavity of the silo 3. The edge of the tray forms a connection position extending outward and is connected to the top of the support rod. The tray is located in the inner cavity of the silo 3, so that when the support rack 62 descends, the support rod will not be blocked by the bottom plate 1 and the silo 3 structure.

[0046] In this embodiment, the movable seat 61 is located outside the rear side of the base plate 1, so that when the movable seat 61 and the supporting rack 62 descend, the movable seat 61 can move to the bottom of the base plate 1, so that the supporting rack 62 moves to the lowest point for material loading.

[0047] Furthermore, the lifting mechanism 2 includes a driving motor 21 and a threaded screw 22. The threaded screw 22 is rotatably arranged vertically on the top of the base plate 1. The driving motor 21 is fixedly installed on the bottom of the base plate 1 to drive the threaded screw 22 to rotate. The surface of the threaded screw 22 is threadedly connected with a threaded sleeve 23. A moving block 24 is fixedly installed on the threaded sleeve 23. A slide cylinder 25 is provided on the rear side of the moving block 24. A connecting plate 26 is fixedly installed on the slider of the slide cylinder 25. The two ends of the connecting plate 26 are respectively provided with connecting protrusions that can be connected to the tray assembly 6.

[0048] In this embodiment, the driving motor 21 drives the threaded screw 22 to rotate, thereby driving the threaded sleeve 23 to move up and down, thereby driving the moving block 24 to move up and down. When the slider of the slide cylinder 25 slides, it will drive the connecting plate 26 to move left or right. The connecting protrusion of the connecting plate 26 can be inserted into the connecting groove on the side of the moving seat 61 to realize the connection between the connecting plate 26 and the moving seat 61, so that when the threaded sleeve 23 moves up and down, the connected moving seat 61 can be driven to move through the connecting plate 26, thereby driving the support rack 61 in a silo 3 to rise and fall.

[0049] The lowest position of the connecting plate 26 corresponds to the lowest position of the movable seat 61, which facilitates the connection.

[0050] For example, when the left hopper 3 is feeding, the slider of the slide cylinder 25 is on the left side, so that the connecting protrusion of the connecting plate 26 is stuck in the connecting groove of the tray assembly 6 on the left, and the threaded screw 22 rotates, thereby driving the threaded sleeve 23 to move upward, and then driving the left tray assembly 6 to move upward through the connecting plate 26, thereby lifting and feeding the material in the left hopper. At this time, the tray assembly 6 in the right hopper 3 is at the lowest point for material loading. When the material in the left hopper 3 is consumed, the driving motor 21 drives the threaded screw 22 to reverse, driving the threaded sleeve 23 to move downward, thereby driving the connecting plate 26 and the left tray assembly 6 to move to the lowest point, and then the slider of the slide cylinder 25 moves to the right, so that the connecting plate 26 is disengaged from the left moving seat 61 and connected to the right moving seat 61, and then drives the right tray assembly 6 to move upward, to lift and feed the material. At this time, the hopper 3 on the left is loaded with materials.

[0051] A vertical plate 7 is provided on the rear side of the middle of the base plate 1 , and a plurality of guide rails are vertically provided on the vertical plate 7 . The two movable seats 61 are slidably connected to the guide rails through sliders, thereby supporting, limiting and guiding the movable seats 61 to keep them moving smoothly.

[0052] Similarly, a connecting block 27 is fixedly connected to the moving block 24 on the surface of the threaded sleeve 23. The cross-section of the connecting block 27 is U-shaped or N-shaped. It bypasses the slide cylinder 25 and the connecting plate 25 and is slidably connected to a guide rail through a slider to guide and limit the threaded sleeve 23, the slide cylinder 25, the connecting plate 26 and other components so that they can only move vertically.

[0053] Furthermore, the silo 3 includes a rear mounting seat 31, a front mounting seat 32, a left mounting seat 33 and a right mounting seat 34 arranged on the base plate 1, and a rear limit plate 35, a front limit plate 36, a left limit plate 37 and a right limit plate 38 are fixedly installed on the rear mounting seat 31, the front mounting seat 32, the left mounting seat 33 and the right mounting seat 34 respectively. The rear limit plate 35, the front limit plate 36, the left limit plate 37 and the right limit plate 38 form a silo cavity, and the tray assembly 6 moves up and down in the silo cavity.

[0054] The tops of the rear limiting plate 35 and the front limiting plate 36 are both provided with air flotation joints for blowing the uppermost sheet to float and separate the sheet, thereby preventing it from adhering to the lower sheet.

[0055] In this embodiment, the rear limit plate 35, the front limit plate 36, the left limit plate 37 and the right limit plate 38 are surrounded by a frame structure with an open top, forming a silo cavity in the middle. The tray part of the tray assembly 6 rises and falls in the cavity, and the material is loaded on the pallet.

[0056] The movable seat 61 is located at the rear of the rear mounting seat 31 , and its movement will not be affected by the rear mounting seat 31 and the rear limiting plate 35 .

[0057] Furthermore, the front mounting seat 32 is slidably disposed on the top of the base plate 1 , and the left mounting seat 33 and the right mounting seat 34 are slidably disposed on the top of the base plate 1 .

[0058] In this embodiment, the rear mounting seat 31 is fixedly mounted on the base plate 1, and the front mounting seat 32 can move forward and backward. When loading materials, the front mounting seat 32 and the front limit plate 36 can be moved forward to increase the space and facilitate the loading of materials. After loading is completed, the front mounting seat 32 and the front limit plate 36 are moved backward to a suitable position and fixed so that they can limit the stacked materials to avoid collapse and deviation.

[0059] Similarly, the left and right mounting seats and the limit plates can also move left and right to increase the space for loading, or they can reduce the space according to the size of the material to maintain the limiting and guiding effect on the material.

[0060] Three slide rails are provided on the base plate 1 , and the front mounting seat 32 , the left mounting seat 33 and the right mounting seat 34 are slidably connected to the slide rails via sliders to achieve position adjustment.

[0061] The left mounting seat 33 and the right mounting seat 34 are both fixedly connected to a connecting frame 39 extending to the bottom of the base plate 1. The two connecting frames 39 are respectively fixedly connected to a rack 310. The two racks 310 are arranged opposite to each other. A gear 311 is rotatably provided at the bottom of the base plate 1 and located between the two racks 310. The two sides of the gear 311 are respectively engaged with a rack 310 so that the two move synchronously in opposite directions.

[0062] By setting the gear 311 and the rack 310, when the left mounting seat 33 is pushed to the right, the corresponding rack 310 moves to the right, driving the gear 311 to rotate, thereby driving the rack 310 on the right mounting seat 34 to move to the left, so that the two are brought closer to each other, reducing the space. The same is true when the left mounting seat 33 is pulled outward, so that the two are moved away from each other, expanding the space.

[0063] The two connecting frames 39 can extend downward from the outside of the bottom plate 1, or a long slot can be opened on the bottom plate 1 for the two connecting frames 39 to move.

[0064] Positioning screws are provided on the front mounting seat 32 and the left mounting seat 33, and positioning strips are provided on the base plate 1 below the positioning screws along the movement direction of the two. By tightening the positioning screws downward so that they are pressed against the positioning strips, the front mounting seat 32 and the left mounting seat 33 can be positioned so that they cannot move on their own, and the right mounting seat 34 is also fixed accordingly.

[0065] The lifting speed of the lifting mechanism 2 should match the material picking and transfer speed of the material picking mechanism 4 and the rotation speed of the conveyor belt 5 so that there will be no mutual interference, and it can be ensured that a piece of the stacked raw materials is separated and sucked and transferred to the conveyor belt 5 and arranged equidistantly on the conveyor belt.

[0066] A precision engraving machine comprises the above-mentioned conveying device.

[0067] The working principle and use process of this utility model: After the utility model is installed,

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A conveying device, characterized in that: The invention comprises a bottom plate (1), a frame-structured silo (3) is respectively provided on both sides of the top of the bottom plate (1), a lifting mechanism (2) is provided on the bottom plate (1) between the two silos (3), a conveyor belt (5) extending backward is provided above the two silos (3), and a material taking mechanism (4) for transferring materials from the silo (3) to the conveyor belt (5) is provided above the front end of the conveyor belt (5); Each of the silos (3) is provided with a tray assembly (6) that can move in a vertical direction, and the lifting mechanism (2) can be connected to a tray assembly (6) to push the material in the corresponding silo upwards; The material taking mechanism (4) includes a mounting frame (41), the bottom of the mounting frame (41) is provided with a movable plate (42) that can be moved left and right to above any material bin (3), the bottom of the mounting frame (41) is provided with a pushing cylinder (46) that drives the movable plate (42) to move, and the bottom of the movable plate (42) is provided with a suction cup assembly.

2. A conveying device according to claim 1, characterized in that: The suction cup assembly comprises a shaftless cylinder (43) fixedly mounted on the bottom of the movable plate (42); a material taking cylinder (44) is vertically arranged at the bottom of the slider of the shaftless cylinder (43); a suction cup seat (45) is arranged at the bottom end of the material taking cylinder (44); and a pneumatic suction cup for sucking materials is arranged at the bottom end of the suction cup seat (45).

3. A conveying device according to claim 1, characterized in that: The tray assembly (6) comprises a movable seat (61) and a supporting frame (62), wherein the movable seat (61) is located outside the silo (3), and the supporting frame (62) is located inside the silo (3) and has a bottom portion extending outward and fixedly connected to the movable seat (61). One side of the movable seat (61) extends toward the lifting mechanism (2) and is provided with a connecting notch, and the lifting mechanism (2) is connected to the movable seat (61) through the connecting notch and drives the movable seat (61) to move upward and downward.

4. A conveying device according to claim 1, characterized in that: The lifting mechanism (2) comprises a driving motor (21) and a threaded screw (22), wherein the threaded screw (22) is rotatably arranged vertically on the top of the base plate (1), and the driving motor (21) is fixedly installed on the bottom of the base plate (1) to drive the threaded screw (22) to rotate, and a threaded sleeve (23) is threadedly connected to the surface of the threaded screw (22), and a moving block (24) is fixedly installed on the threaded sleeve (23), and a slide cylinder (25) is provided on the rear side of the moving block (24), and a connecting plate (26) is fixedly installed on the slider of the slide cylinder (25), and both ends of the connecting plate (26) are respectively provided with connecting protrusions that can be connected to the tray assembly (6).

5. A conveying device according to claim 1, characterized in that: The silo (3) comprises a rear mounting seat (31), a front mounting seat (32), a left mounting seat (33) and a right mounting seat (34) which are arranged on the bottom plate (1); a rear limiting plate (35), a front limiting plate (36), a left limiting plate (37) and a right limiting plate (38) are fixedly mounted on the rear mounting seat (31), the front mounting seat (32), the left limiting plate (33) and the right limiting plate (34) respectively; the rear limiting plate (35), the front limiting plate (36), the left limiting plate (37) and the right limiting plate (38) form a silo cavity, and the tray assembly (6) moves up and down in the silo cavity.

6. A conveying device according to claim 5, characterized in that: The front mounting seat (32) can be slidably arranged on the top of the base plate (1) in a forward and backward manner, and the left mounting seat (33) and the right mounting seat (34) can be slidably arranged on the top of the base plate (1) in a forward and backward manner, respectively. The left mounting seat (33) and the right mounting seat (34) are both fixedly connected to a connecting frame (39) extending to the bottom of the base plate (1), and the two connecting frames (39) are respectively fixedly connected to a rack (310). The two racks (310) are arranged opposite to each other. A gear (311) is rotatably arranged at the bottom of the base plate (1) and located between the two racks (310). The two sides of the gear (311) are respectively engaged with a rack (310) so that the two move synchronously in opposite directions.

7. A precision engraving machine, characterized in that: The invention comprises the conveying device according to any one of claims 1 to 6.

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