A conveying device for plastic bottles and a three-color screen printing machine

Abstract

The utility model relates to the technical field of plastics processing discloses a conveying device and three -color silk screen printing machine for plastic bottle, include: clamping mechanism, push mechanism, rotating mechanism and fixed side plate, clamping mechanism includes first air cylinder and clamping block, through first air cylinder drive clamping block clamping plastic bottle, push mechanism includes second air cylinder, and the output shaft of second air cylinder is installed with connecting plate, and push mechanism drives clamping mechanism to stretch out and retract through connecting plate, rotating mechanism includes drive part and rotating shaft, and rotating shaft installs on the mounting shaft of drive part, and the shell of rotating shaft is fixedly connected with vertical plate, and the shell of second air cylinder is fixed on vertical plate, rotating mechanism drives push mechanism and clamping mechanism to rotate through vertical plate, fixed side plate sets up in the both sides of push mechanism, and fixed side plate is used for fixing the position of conveying device. The utility model's conveying device can be used for feeding and discharging respectively, realizes structural integration, reduces manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, specifically to a conveying device for plastic bottles and a three-color screen printing machine. Background Technology

[0002] A three-color screen printing machine is a screen printing device that can complete three-color printing on plastic products in one pass. Its core principle is the same as a single-color screen printing machine: computer control converts the pattern to be printed into digital signals, and the control system drives a flat turntable to rotate, precisely conveying the plastic product sequentially to each station. At the printing station, the squeegee applies pressure to the ink on the screen printing plate, forcing the ink through the mesh of the image area onto the plastic product. After one color printing is completed, the turntable moves the product to the next printing station for the second and third colors. After each printing, the ink is quickly cured by UV LED lamps, ultimately completing the three-color printing. A three-color screen printing machine includes a multi-station turntable, loading and unloading devices, and a UV LED curing system.

[0003] The efficiency and precision of the plastic bottle conveying device in a three-color screen printing machine directly affect the overall production capacity and product quality of the three-color screen printing machine production line. In existing three-color screen printing machines, the plastic bottle conveying device usually adopts an independent actuator design for loading and unloading. However, when conveying plastic bottles, loading and unloading are each equipped with independent power components and control modules, resulting in redundant structure, large size, and high manufacturing cost.

[0004] Therefore, there is an urgent need to develop a conveying device for plastic bottles and a three-color screen printing machine to address the shortcomings of existing technologies. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a conveying device and a three-color screen printing machine for plastic bottles, which can be used for loading and unloading respectively, achieving structural integration and reducing manufacturing costs. The implementation of this technical solution is as follows:

[0006] A conveying device for plastic bottles, comprising:

[0007] A clamping mechanism, comprising a first cylinder and a clamping block, wherein the clamping block is driven by the first cylinder to clamp the plastic bottle;

[0008] A pushing mechanism, which includes a second cylinder, the output shaft of which is equipped with a connecting plate, and the pushing mechanism drives the clamping mechanism to extend and retract through the connecting plate;

[0009] A rotating mechanism includes a driving component and a rotating shaft. The rotating shaft is mounted on the mounting shaft of the driving component. A longitudinal plate is fixedly connected to the housing of the rotating shaft, and the housing of the second cylinder is fixed to the longitudinal plate. The rotating mechanism drives a pushing mechanism and a clamping mechanism to rotate via the longitudinal plate.

[0010] Fixed side plates are disposed on both sides of the pushing mechanism and are used to fix the position of the conveying device.

[0011] Preferably, the clamping mechanism further includes:

[0012] A push plate, which is fixed on the output shaft of the first cylinder, and the push plate is provided with mutually symmetrical sliding holes;

[0013] A double swing arm, each of which is provided with a sliding pin, the sliding pin being inserted into a sliding hole;

[0014] The first guide rail is mounted on the connecting plate, and two first sliders are slidably mounted on the first guide rail. The two first sliders are respectively mounted on the swing arm.

[0015] Preferably, a second guide rail is provided on each side of the longitudinal plate, and a second slider is slidably mounted on the second guide rail, and the second slider is mounted on the connecting plate.

[0016] Preferably, the rotating shaft is rotatably inserted into the fixed side plate.

[0017] Preferably, a bearing is provided between the rotating shaft and the fixed side plate, and the bearing is used to enable the rotating shaft to rotate on the fixed side plate.

[0018] Preferably, the connecting plate is provided with a limiting block, the longitudinal plate is provided with a support block, and the limiting block is located above the support block.

[0019] Preferably, the swing arm is provided with a plurality of clamping blocks.

[0020] Preferably, a clamping arm is provided between the swing arm and the clamping block, one end of the clamping arm is fixedly connected to the clamping block, and the other end is slidably connected to the swing arm.

[0021] This application also relates to a three-color screen printing machine, including the aforementioned conveying device and a turntable; the turntable is provided with a plurality of top mold mechanisms, the plurality of top mold mechanisms being evenly arranged along the axis of the turntable, and the turntable driving the plurality of top mold mechanisms to rotate.

[0022] Preferably, the top mold mechanism includes:

[0023] Base, which is mounted on a turntable;

[0024] The third cylinder is fixed on the base. The output shaft of the third cylinder is equipped with a main guide plate. The main guide plate has main guide columns on both sides, and the main guide columns on both sides pass through the base.

[0025] A secondary guide plate is provided, with one end of the main guide column fixed to the secondary guide plate, and secondary guide columns provided on both sides of the secondary guide plate; the secondary guide columns are respectively inserted into the base;

[0026] The top plate has one end of the auxiliary guide post fixed to it, and a top head is installed in the middle of the top plate. The top head is used to abut against one end of the plastic bottle.

[0027] The motor is fixed on the base, and the output shaft of the motor is mounted with a base plate, which is used to abut against the other end of the plastic bottle.

[0028] Compared with the prior art, this application has the following advantages:

[0029] This technical solution's conveying device, through the coordinated operation of a clamping mechanism, a pushing mechanism, and a rotating mechanism, can precisely convey vertically placed plastic bottles to a horizontal position by rotating them 90° during loading, and then precisely transport them to a preset workstation. During unloading, the plastic bottles are detached, rotated back to a vertical position, and pushed to the discharge position. Continuous operation is achieved through repetitive actions. Simultaneously, a fixed side plate ensures stable installation, and the smooth coordination of each mechanism's actions achieves structural integration, reducing manufacturing costs. This effectively solves the compatibility problem of loading and unloading plastic bottles with three-color screen printing machines.

[0030] The clamping mechanism of this technical solution adopts a structure of a first cylinder driving a push plate, double swing arms cooperating with a first guide rail. Through the transmission of sliding holes and sliding pins and the guiding action of the slider, the clamping blocks can be opened and closed smoothly. Each swing arm is equipped with two clamping blocks to increase the contact area with the plastic bottle, improve the clamping stability, and prevent the plastic bottle from falling off. The pushing mechanism, with the guidance of the second guide rail and the second slider, ensures the stability of the extension and retraction trajectory of the clamping mechanism. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 for Figure 1 Another perspective view;

[0034] Figure 3 This is a schematic diagram of the clamping mechanism and the pushing mechanism of this utility model;

[0035] Figure 4 for Figure 3 Exploded view;

[0036] Figure 5 A schematic diagram of the structure for fixing the side plate and rotating shaft;

[0037] Figure 6 This is a schematic diagram of a three-color screen printing machine;

[0038] Figure 7 This is a schematic diagram of the top mold mechanism;

[0039] Figure 8 This is another perspective view of the top mold mechanism.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Clamping mechanism; 11. First cylinder; 12. Push plate; 121. Sliding hole; 13. Swing arm; 131. Sliding pin; 132. Clamping block; 133. Clamping arm; 1331. Connecting part; 134. Long slot; 14. First guide rail; 141. First slider;

[0042] 2. Pushing mechanism; 21. Second cylinder; 22. Second guide rail; 221. Second slider; 23. Connecting plate; 231. Limiting block;

[0043] 3. Rotating mechanism; 31. Driving component; 32. Rotating shaft; 33. Longitudinal plate; 331. Support block;

[0044] 4. Fixed side plate; 41. Bearing;

[0045] 5. Turntable;

[0046] 6. Top mold mechanism; 61. Base; 62. Third cylinder; 621. Main guide plate; 622. Secondary guide plate; 623. Main guide column; 624. Secondary guide column; 63. Top plate; 631. Top head; 64. Motor; 641. Base plate. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0048] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] The conveying device of this application is used to convey plastic bottles to or from a three-color screen printing machine, that is, to realize the feeding and unloading functions of plastic bottles through the conveying device of this application.

[0051] Embodiments of this application provide a conveying device for plastic bottles, such as... Figure 1-5 As shown, the device includes: a clamping mechanism 1, a pushing mechanism 2, a rotating mechanism 3, and a fixed side plate 4. The clamping mechanism 1 includes a first cylinder 11 and a clamping block 132, with the first cylinder 11 driving the clamping block 132 to clamp the plastic bottle. The pushing mechanism 2 includes a second cylinder 21, with a connecting plate 23 mounted on the output shaft of the second cylinder 21. The pushing mechanism 2 drives the clamping mechanism 1 to extend and retract via the connecting plate 23. The rotating mechanism 3 includes a driving component 31 and a rotating shaft 32, with the rotating shaft 32 mounted on the mounting shaft of the driving component 31. A longitudinal plate 33 is fixedly connected to the housing of the rotating shaft 32, and the housing of the second cylinder 21 is fixed to the longitudinal plate 33. The rotating mechanism 3 drives the pushing mechanism 2 and the clamping mechanism 1 to rotate via the longitudinal plate 33. The fixed side plate 4 is located on both sides of the pushing mechanism 2 and is used to fix the position of the conveying device.

[0052] To better understand some embodiments of this application, two application scenarios of the conveying device protected by this application are as follows:

[0053] During loading, the plastic bottle is placed vertically and clamped by the clamping mechanism 1, fixing the bottle to the clamping mechanism 1. Then, the rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90°, changing the plastic bottle to a horizontal position. The pushing mechanism 2 then transports the plastic bottle to the preset station of the three-color screen printing machine. Subsequently, the clamping mechanism 1 releases the plastic bottle, the pushing mechanism 2 retracts, and the rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90° in the opposite direction, returning to the initial position. The above steps are repeated to achieve continuous loading.

[0054] During feeding, the plastic bottle is placed horizontally on the three-color screen printing machine. The rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90°, so that the clamping mechanism 1 is aligned with the plastic bottle and can clamp it. Then, the pushing mechanism 2 drives the plastic bottle to detach from the three-color screen printing machine. Next, the rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90° in the opposite direction, returning to the initial position, so that the plastic bottle is placed vertically. Then, the pushing mechanism 2 pushes the plastic bottle to the discharge position. The above steps are repeated to achieve the function of continuous feeding.

[0055] In some implementations, such as Figure 3-4 As shown, the clamping mechanism 1 further includes a push plate 12, double swing arms 13, and a first guide rail 14. The push plate 12 is fixed on the output shaft of the first cylinder 11, and the push plate 12 has symmetrical sliding holes 121. The swing arms 13 are respectively provided with sliding pins 131, which are inserted into the sliding holes 121. The first guide rail 14 is mounted on the connecting plate 23, and two first sliders 141 are slidably mounted on the first guide rail 14. The two first sliders 141 are respectively mounted on the swing arms 13. The clamping block 132 is mounted on the lower part of the swing arms 13. Through the opening and clamping actions of the two swing arms 13, the clamping block 132 is driven to clamp and release the plastic bottle.

[0056] Specifically, the first cylinder 11 is a linear cylinder. The extension and retraction of the first cylinder 11 drives the push plate 12 to move up and down, and simultaneously drives the swing arm 13 to move left and right, thereby clamping and releasing the plastic bottle. Specifically, when the output shaft of the first cylinder 11 extends, the push plate 12 moves downwards along with the cylinder's output shaft, and the sliding pin 131 of the swing arm 13 moves synchronously along the sliding hole 121 of the push plate 12. Figure 3-4As shown, the two swing arms 13 separate to the left and right, respectively, causing the clamping block 132 to move away from the plastic bottle, thus releasing the plastic bottle. Since the two swing arms 13 are respectively engaged with the first guide rail 14 through the first slider 141, it is ensured that the two swing arms 13 move smoothly along the horizontal direction of the first guide rail 14, avoiding deviation. When the output shaft of the first cylinder 11 retracts, the push plate 12 moves upward with the output shaft of the cylinder, and the sliding pin 131 of the swing arm 13 moves in the opposite direction along the sliding hole 121 of the push plate 12. The two swing arms 13 move closer to each other, driving the clamping block 132 to move closer to and clamp the plastic bottle, thus achieving a stable clamping of the plastic bottle. Through the sliding engagement of the first guide rail with the double swing arms and the first slider, the spacing between the swing arms of the clamping mechanism can be flexibly adjusted according to the diameter of the plastic bottle. Without replacing the clamping block or adjusting the overall structure of the device, it can adapt to the clamping requirements of different specifications of plastic bottles, greatly improving the versatility and applicability of the device; at the same time, the guiding effect of the first guide rail ensures the clamping stability of the clamping block during the spacing adjustment process.

[0057] In some implementations, such as Figure 1 As shown, the two swing arms 13 are provided with a plurality of clamping blocks 132. Preferably, each swing arm 13 has two clamping blocks 132 spaced apart along its length. The end of each clamping block 132 facing the plastic bottle has an arc-shaped portion. The clamping blocks 132 on the two swing arms 13 are symmetrically distributed, and the arc-shaped portions of the clamping blocks 132 are also arranged opposite each other. When the two swing arms 13 slide towards each other to achieve a clamping action, the opposite arc-shaped portions can jointly enclose to form a clamping space that matches the contour of the outer wall of the plastic bottle. The shape of this clamping space matches the cylindrical structure of the plastic bottle and can closely fit the side wall of the plastic bottle. At the same time, the layout of multiple clamping blocks 132 achieves large-area clamping of the plastic bottle. The design of multiple clamping blocks 132 increases the contact area between the clamping mechanism 1 and the plastic bottle, improves the clamping stability, and can effectively prevent the plastic bottle from shaking or falling during conveying and rotation. It is especially suitable for clamping plastic bottles of different specifications and enhances the versatility of the device.

[0058] In some implementations, such as Figure 3As shown, a clamping arm 133 is also provided between the swing arm 13 and the clamping block 132. One end of the clamping arm 133 is fixedly connected to the clamping block 132, and the other end is slidably connected to the swing arm 13. Specifically, the swing arm 13 has an elongated opening 134 along its length direction. The end of the clamping arm 133 near the swing arm 13 has a connecting part 1331 that matches the elongated opening 134. A fixing member (not shown) passes through the elongated opening 134 and cooperates with the connecting part 1331 to lock the clamping arm 133 in a preset position of the swing arm 13. The fixing member can be a bolt, a hand screw, or other components. When the vertical position of clamp 132 needs to be adjusted according to the height specifications of the plastic bottle, simply loosen the fixing piece, allowing clamp arm 133 to slide along the length of the elongated opening 134, causing clamp 132 to move up and down synchronously. After clamp 132 moves to a position suitable for the height of the plastic bottle, tighten the fixing piece to relock clamp arm 133 and swing arm 13, thus fixing the position of clamp 132. Through the sliding connection between clamp arm 133 and swing arm 13, and the cooperation of elongated opening 134 and fixing piece, the position of clamp 132 can be flexibly adjusted along the height direction of the plastic bottle. Without replacing swing arm 133 or clamp 132, it can adapt to plastic bottles of different height specifications, further expanding the compatibility range of the device with plastic bottle specifications and improving the versatility of the device.

[0059] In some implementations, such as Figure 3-4 As shown, the vertical plate 33 is provided with second guide rails 22 on both sides, and second sliders 221 are slidably mounted on the second guide rails 22. The second sliders 221 are mounted on the connecting plate 23. Specifically, the second cylinder 21 is a linear cylinder. Since the second sliders 221 are mounted on the connecting plate 23, the output shaft of the second cylinder 21 drives the connecting plate 23 to move up and down, thereby making the clamping mechanism 1 move synchronously along the sliding direction of the second guide rails 22. Through the cooperation of the second guide rails 22 and the second sliders 221, precise guidance is provided for the telescopic movement of the clamping mechanism 1, ensuring that the movement trajectory of the clamping mechanism 1 is stable during the pushing process, avoiding deviation or jamming, improving the accuracy of the plastic bottle conveying position, and ensuring the precise docking of the conveying device of this application with the three-color screen printing machine station.

[0060] In some implementations, such as Figure 3-4 As shown, the connecting plate 23 is provided with a limit block 231, and the longitudinal plate 33 is provided with a support block 331. The limit block 231 is located above the support block 331. The function of setting the limit block 231 and the support block 331 is to prevent the second cylinder 21 from driving the clamping mechanism 1 to move beyond the stroke range, thereby achieving the limiting function and ensuring the safety and stability of the conveying process.

[0061] In some implementations, such as Figure 2 and Figure 5As shown, the rotating shaft 32 is rotatably inserted into the fixed side plate 4. A bearing 41 is provided between the rotating shaft 32 and the fixed side plate 4. The bearing 41 is used to enable the rotating shaft 32 to rotate on the fixed side plate 4. The bearing 41 is used to reduce the friction between the rotating shaft 32 and the fixed side plate 4, so that the rotating shaft 32 can rotate flexibly on the fixed side plate 4. Specifically, the driving component 31 is a rotary cylinder or a servo motor. When the driving component 31 is started, it drives the rotating shaft 32 to rotate. Since the longitudinal plate 33 is fixed on the rotating shaft 32, the pushing mechanism 2 and the clamping mechanism 1 can rotate with the rotating shaft 32.

[0062] like Figure 6-8 As shown, an embodiment of this application also provides a three-color screen printing machine, including the aforementioned conveying device and a turntable 5; the turntable 5 is provided with a plurality of top mold mechanisms 6, which are evenly arranged along the axis of the turntable 5, and the turntable 5 drives the plurality of top mold mechanisms 6 to rotate; preferably, there are 10 top mold mechanisms 6, which is equivalent to 10 workstations on the turntable 5, respectively used to realize different processing steps of the three-color screen printing machine on plastic bottles, forming a complete continuous operation process.

[0063] In some implementations, such as Figure 7-8 As shown, the top mold mechanism 6 includes: a base 61, a third cylinder 62, a secondary guide plate 622, a top plate 63, and a motor 64; the base 61 is mounted on the turntable 5; the third cylinder 62 is fixed on the base 61, and a main guide plate 621 is mounted on the output shaft of the third cylinder 62; main guide columns 623 are provided on both sides of the main guide plate 621, and the main guide columns 623 on both sides are respectively inserted into the base 61; one end of the main guide column 623 is fixed to the secondary guide plate 622. On plate 622, secondary guide posts 624 are provided on both sides of the secondary guide plate 622; the secondary guide posts 624 are respectively inserted into the base 61; one end of the secondary guide post 624 is fixed to the top plate 63, and a top head 631 is installed in the middle of the top plate 63, the top head 631 is used to abut against one end of the plastic bottle; the motor 64 is fixed to the base 61, and the output shaft of the motor 64 is mounted on a base plate 641, the base plate 641 is used to abut against the other end of the plastic bottle. Specifically, the top head 631 is rotatably mounted on the top plate 63; the rotatable design of the top head 631, in conjunction with the base plate 641 driven by the motor 64, can drive the plastic bottle to rotate synchronously, providing stable support for the uniform circumferential printing of the plastic bottle during the three-color screen printing process.

[0064] In some embodiments, during loading, when the conveying device clamps the plastic bottle to the preset station, the plastic bottle is placed horizontally. At this time, the third cylinder 62 is activated, and its output shaft drives the main guide plate 621, main guide column 623, auxiliary guide plate 622, and auxiliary guide column 624 to move linearly, causing the top head 631 on the top plate 63, which is fixedly connected to the auxiliary guide column 624, to move towards the plastic bottle. During this process, the top head 631 and the bottom plate 641 respectively abut against the two ends of the plastic bottle, so that the plastic bottle is clamped on the top mold mechanism 6. Then, the clamping mechanism 1 of the conveying device releases the plastic bottle, the pushing mechanism 2 retracts, and then the rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90° in the opposite direction, returning to the initial position; the plastic bottle is no longer clamped. Then, the motor 64 drives the bottom plate 641 to rotate, thereby driving the plastic bottle to rotate synchronously for processing.

[0065] In some embodiments, during unloading, the motor 64 stops rotating, the plastic bottle processing stops, and the conveying device rotates to clamp the plastic bottle. At this time, the third cylinder 62 starts, and its output shaft drives the main guide plate 621, the main guide column 623, the secondary guide plate 622, and the secondary guide column 624 to move linearly, causing the top head 631 on the top plate 63, which is fixedly connected to the secondary guide column 624, to move away from the plastic bottle, so that the top head 631 and the bottom plate 641 no longer abut against the two ends of the plastic bottle. Then, the pushing mechanism 2 drives the plastic bottle to detach from the top mold mechanism 6. Then, the rotating mechanism 3 drives the clamping mechanism 1 and the pushing mechanism 2 to rotate 90° in the opposite direction, returning to the initial position, so that the plastic bottle is placed vertically, completing the unloading.

[0066] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A conveying device for plastic bottles, characterized in that, include: A clamping mechanism, comprising a first cylinder and a clamping block, wherein the clamping block is driven by the first cylinder to clamp the plastic bottle; A pushing mechanism, which includes a second cylinder, the output shaft of which is equipped with a connecting plate, and the pushing mechanism drives the clamping mechanism to extend and retract through the connecting plate; A rotating mechanism includes a driving component and a rotating shaft. The rotating shaft is mounted on the mounting shaft of the driving component. A longitudinal plate is fixedly connected to the housing of the rotating shaft, and the housing of the second cylinder is fixed to the longitudinal plate. The rotating mechanism drives a pushing mechanism and a clamping mechanism to rotate through the longitudinal plate. Fixed side plates are disposed on both sides of the pushing mechanism and are used to fix the position of the conveying device.

2. The conveying device according to claim 1, characterized in that, The clamping mechanism further includes: A push plate, which is fixed on the output shaft of the first cylinder, and the push plate is provided with mutually symmetrical sliding holes; A double swing arm, each of which is provided with a sliding pin, the sliding pin being inserted into a sliding hole; The first guide rail is mounted on the connecting plate, and two first sliders are slidably mounted on the first guide rail. The two first sliders are respectively mounted on the swing arm.

3. The conveying device according to claim 2, characterized in that, The longitudinal plate is provided with a second guide rail on each side, and a second slider is slidably mounted on the second guide rail. The second slider is mounted on the connecting plate.

4. The conveying device according to claim 1, characterized in that, The rotating shaft is rotatably inserted into the fixed side plate.

5. The conveying device according to claim 4, characterized in that, A bearing is provided between the rotating shaft and the fixed side plate, and the bearing is used to enable the rotating shaft to rotate on the fixed side plate.

6. The conveying device according to claim 3, characterized in that, The connecting plate is provided with a limit block, the longitudinal plate is provided with a support block, and the limit block is located above the support block.

7. The conveying device according to claim 3, characterized in that, The swing arm is equipped with several clamping blocks.

8. The conveying device according to claim 7, characterized in that, A clamping arm is provided between the swing arm and the clamping block. One end of the clamping arm is fixedly connected to the clamping block, and the other end is slidably connected to the swing arm.

9. A three-color screen printing machine, characterized in that, The device includes a conveying device as described in any one of claims 1-8, and a turntable; the turntable is provided with a plurality of top mold mechanisms, the plurality of top mold mechanisms are evenly arranged along the axis of the turntable, and the turntable drives the plurality of top mold mechanisms to rotate.

10. The three-color screen printing machine according to claim 9, characterized in that, The top mold mechanism includes: Base, which is mounted on a turntable; The third cylinder is fixed on the base. The output shaft of the third cylinder is equipped with a main guide plate. The main guide plate has main guide columns on both sides, and the main guide columns on both sides pass through the base. A secondary guide plate is provided, with one end of the main guide column fixed to the secondary guide plate, and secondary guide columns provided on both sides of the secondary guide plate; the secondary guide columns are respectively inserted into the base; The top plate has one end of the auxiliary guide post fixed to it, and a top head is installed in the middle of the top plate. The top head is used to abut one end of the plastic bottle. The motor is fixed on the base, and the output shaft of the motor is mounted with a base plate, which is used to abut against the other end of the plastic bottle.

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