A screen printing machine with a plastic casing

Abstract

This utility model relates to the field of plastic shell processing technology, specifically a screen printing machine for plastic shells, including a frame. This screen printing machine for plastic shells, through the cooperation of a double-belt conveyor, a push-top, a limiting component, and a tilting component, achieves fully automated operation of the plastic shell from conveying, positioning, flipping to screen printing. It eliminates the need for manual placement or transfer, significantly reducing labor costs and avoiding operational errors caused by human fatigue. The limiting component uses a side-push cylinder and a stop bar to limit the shell conveying. The tilting component clamps the shell with a push-push cylinder, and the push-top ensures stable support after the shell is detached from the conveyor belt. Multiple components work together to ensure the shell is transferred to the bottom of the screen printing component for operation. With its simple mechanical structure, the equipment purchase cost is lower, and the cylinder components are easy and inexpensive to maintain, requiring no professional technicians for daily maintenance, thus reducing the burden of production and maintenance for enterprises.

Description

Technical Field

[0001] This utility model relates to the field of plastic shell processing technology, specifically a screen printing machine for plastic shells. Background Technology

[0002] In the production of plastic casings for communication equipment, the screen printing process is crucial, directly affecting the casing's aesthetics, the clarity of markings, and the overall image of the product. Traditional screen printing operations have many drawbacks. Typically, when plastic casings are transported to the screen printing station via a conveyor belt, the screen printing operation relies heavily on manual labor to place each casing under the stencil. This manual operation method is extremely inefficient, has high labor costs, and workers are prone to fatigue and operational errors due to prolonged repetitive labor, resulting in inaccurate casing placement and consequently causing deviations, blurring, or defects in the screen printing pattern, seriously affecting product quality and yield. Although some large enterprises use robotic arms to assist in transferring casings under the stencil, such equipment has high purchase costs, complex maintenance, and requires highly skilled operators. Utility Model Content

[0003] To achieve the above objectives, this utility model provides the following technical solution: a screen printing machine with a plastic shell, comprising a frame, on which a double belt conveyor is mounted and a vertical frame is fixed on one side of the double belt conveyor. A screen printing assembly is mounted on the vertical frame, and a tilting assembly is also mounted on the vertical frame. A base plate is fixed to the bottom of the double belt conveyor, and a pusher is mounted on the base plate. An upper top plate that can pass through the gap between the double belt conveyor is fixed to the pusher top. The tilting assembly includes a base that slides with the vertical frame, a bearing plate is hinged to the base, a pair of side rails are fixed to the bearing plate, and a clamping part located between the side rails is also fixed. A flipping and pushing part is also mounted on the base, and the flipping end of the flipping and pushing part is hinged to the bearing plate.

[0004] Furthermore, the flipping and pushing part includes a top-pushing cylinder mounted on the base and a pair of side-pushing cylinders hinged to the base. A vertical plate is fixed on the upright frame. The piston rod of the top-pushing cylinder is fixed to the vertical plate, and the piston rod of the side-pushing cylinder is hinged to the bearing plate.

[0005] Furthermore, a stop block is fixed on one side of the base, located below the support plate, to support the support plate.

[0006] Furthermore, the clamping part consists of a pair of push cylinders fixed to the support plate.

[0007] Furthermore, the pusher includes an upper pusher cylinder installed at the bottom of the base plate and a pair of guide rods passing through it. The piston rod of the upper pusher cylinder is fixed to the upper top plate, and the top end of the guide rod is also fixed to the upper top plate.

[0008] Furthermore, a limiting component is fixed on the platform, located on the other side of the double belt conveyor and opposite to the upright. The limiting component includes a side plate and a pair of platform plates fixed on the platform, with a long plate fixed between the platform plates. A side push cylinder and a stop rod are hinged to the side plate, and the piston rod of the side push cylinder is hinged to one end of the stop rod.

[0009] Furthermore, the screen printing assembly includes a lower top cylinder installed on the top of the stand, the piston rod of the lower top cylinder is fixed to a lower top plate that slides between itself and the upper column of the stand, a screen plate located above the support plate is fixed to the bottom side of the lower top plate, a front push cylinder is installed on the top of the lower top plate, a push cylinder is fixed to the piston rod of the front push cylinder, a top push cylinder is fixed to the piston rod of the push cylinder, and two sets of screws are threaded to the ejector end of the top push cylinder, a frame rod is limited and passes through between the screws, the frame rod is in the shape of a mountain, and a scraper that can be located in the screen plate is installed at the bottom, and a spring is sleeved on the outside of the screw.

[0010] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0011] This screen printing machine for plastic shells achieves fully automated operation from conveying, positioning, flipping to screen printing of plastic shells through the cooperation of a double belt conveyor, a push-top, a limiting component, and a tilting table component. It eliminates the need for manual placement or transfer, significantly reducing labor costs and avoiding operational errors caused by human fatigue. The limiting component uses a side-push cylinder and a stop bar to limit the conveying of the shells. The tilting table component clamps the shells with a push-push cylinder and pushes the top to ensure stable support after the shells are detached from the conveyor belt. The multiple components work together to ensure that the shells are transferred to the bottom of the screen printing component to complete the operation. With its simple mechanical structure, the equipment purchase cost is lower, and the cylinder components are easy and inexpensive to maintain. Daily maintenance can be completed without professional technicians, reducing the production and maintenance burden on enterprises. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a three-dimensional structural diagram of the limiting component in this utility model;

[0014] Figure 3 This is a three-dimensional schematic diagram of the bottom plate connection structure on the double belt conveyor platform of this utility model.

[0015] Figure 4 This is a three-dimensional schematic diagram of the frame connection structure of this utility model.

[0016] In the diagram: 1. Frame; 2. Double belt conveyor; 3. Limiting component; 31. Platform; 32. Long plate; 33. Side plate; 34. Side push cylinder; 35. Stop bar; 4. Screen printing component; 41. Lower top cylinder; 42. Lower top plate; 43. Mesh plate; 44. Front push cylinder; 45. Push cylinder; 46. Top push cylinder; 47. Screw; 48. Spring; 49. Frame rod; 410. Scraper; 5. Turning table component; 51. Base; 52. Vertical plate; 53. Push cylinder; 54. Bearing plate; 55. Side push cylinder; 56. Opposite push cylinder; 57. Side stop; 58. Stop block; 6. Base plate; 7. Upper top cylinder; 8. Guide rod; 9. Upper top plate; 10. Frame. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-4 This embodiment of a screen printing machine for plastic shells includes a frame 1. A double belt conveyor 2 is fixedly installed on the top of the frame 1 for conveying plastic shells to be screen printed. A base plate 6 is fixed to the bottom of the double belt conveyor 2. A pusher is installed on the base plate 6. The pusher includes an upper lifting cylinder 7 fixed to the bottom of the base plate 6 and a pair of guide rods 8 vertically passing through the base plate 6. The piston rod of the upper lifting cylinder 7 is fixed to an upper top plate 9 connected to the guide rods 8. The upper top plate 9 can pass vertically through the gap between the two belts of the double belt conveyor 2 to lift the plastic shells on the conveyor and remove them from the belts, facilitating subsequent positioning and flipping.

[0019] like Figure 2 A limiting component 3 is fixed on the platform 1, located on the front of the double belt conveyor 2. The limiting component 3 includes a pair of platform plates 31 and a side plate 33 fixed on the platform 1. A long plate 32 is horizontally fixed between the pair of platform plates 31 to form a limiting support structure. A side push cylinder 34 is hinged to the back of the side plate 33 and a stop rod 35 is hinged to the right side. The piston rod of the side push cylinder 34 is hinged to one end of the stop rod 35. The extension and retraction of the side push cylinder 34 can drive the stop rod 35 to rotate around the hinge point, thereby limiting the conveying of the plastic shell on the double belt conveyor 2 and ensuring that the shell is accurately stopped at the corresponding position of the screen printing station.

[0020] like Figure 4The platform 1 is fixed with a vertical frame 10 located on the back of the double belt conveyor 2 and distributed opposite to the long plate 32. The vertical frame 10 is divided into an upper plate, a lower plate and a column. A flip-top assembly 5 is slidably installed on the top of the lower plate, and a screen printing assembly 4 is installed between the upper plate and the column, with the flip-top assembly 5 located below the screen printing assembly 4.

[0021] The flip-table assembly 5 includes a base 51 slidably connected to a lower plate. The top of the base 51 has two sets of L-shaped plates. A bearing plate 54 is hinged between the tops of the plates of the base 51. The bearing plate 54 is used to place the plastic shells to be screen-printed. A pair of oppositely arranged side guards 57 are fixed on the top of the bearing plate 54. A clamping part is fixed between the side guards 57 on the top of the bearing plate 54. The clamping part is a pair of horizontally oppositely arranged counter-push cylinders 56. By extending and retracting the counter-push cylinders 56, a certain number of plastic shells can be clamped to prevent the shells from shifting. A push-top cylinder 53 is installed on the base 51. A vertical plate 52 is fixed on the lower plate. The piston rod of the push-top cylinder 53 is fixed to the vertical plate 52. A side-push cylinder 55 is hinged to the other end of each plate of the base 51 and is hinged to the bearing plate 54. The extension and retraction of the side-push cylinder 55 can drive the bearing plate 54 to rotate around its hinge point with the base 51, thus making the bearing plate upright. The extension and retraction of the push cylinder 53 can drive the base 51 to move along the stand 10, so that the bearing plate can be close to the side of the outer shell pushed up by the top plate. In addition, when the outer shell is clamped by the push cylinder, the retraction of the side-push cylinder and the push cylinder can drive the outer shell to rotate and place the side below the mesh plate. The side of the base 51 plate is fixed with a stop block 58 located below the bearing plate 54, which is used to limit and support when the bearing plate is upright to ensure the bearing stability.

[0022] Additionally, the screen printing assembly 4 includes a lower top cylinder 41 fixed to the top of the upper plate. A lower top plate 42 is fixed to the bottom end of the piston rod of the lower top cylinder 41, and the lower top plate 42 slides in cooperation with the column on the support frame 10. The lower top plate 42 can be driven to slide up and down along the column by the extension and retraction of the lower top cylinder 41. A screen plate 43 is fixedly installed on the bottom side of the lower top plate 42, located directly above the support plate 54, for shaping the screen printing pattern. A front push cylinder 44 is fixedly installed on the top of the lower top plate 42. A push cylinder 45 is fixed to the end of the piston rod of the front push cylinder 44, and a top push cylinder 46 is fixed to the end of the piston rod of the push cylinder 45. The ejector end of the push cylinder 46 is connected by two sets of parallel screws 47 via threads. A support rod 49 is provided between the two sets of screws 47 to limit their movement. The support rod 49 has a mountain-shaped structure, and a scraper 410 is fixedly installed at its bottom. The scraper 410 can extend into the screen plate 43. A spring 48 is sleeved on the outside of the screws 47 to buffer the contact pressure between the scraper 410 and the screen plate 43, so as to avoid damage to the screen plate or the outer shell, and at the same time ensure uniform screen printing. The lower top plate is driven to rise by the lower push cylinder to leave space for the bearing plate to flip. At the same time, it can move down to get close to the outer shell. The scraper is driven to complete the screen printing by the cooperation of the push cylinder, the push cylinder and the front push cylinder.

[0023] The working principle described above is as follows:

[0024] The plastic casing of the communication equipment to be screen-printed is fed into the double-belt conveyor via the feeding mechanism. The double-belt conveyor starts, moving the casing towards the screen-printing station. When the casing approaches the station, the side-push cylinder in the limiting assembly extends, pushing the stop rod to rotate around the hinge point with the side plate, preventing further movement of the casing and achieving precise positioning of the casing directly below the screen-printing station. The top-push cylinder starts, extending the piston rod upwards, causing the top plate to rise vertically along the guide rod. The top plate passes through the gap between the two belts of the double-belt conveyor, lifting the positioned plastic casing until it detaches from the belt surface. Simultaneously, the side-push cylinder of the tilting assembly extends or retracts its piston rod, driving the carrier plate to tilt around the hinge point with the base to a preset angle. The stop block provides support when the carrier plate is horizontal, ensuring the casing's stability during tilting. The push-top cylinder starts, extending the piston rod towards the casing, driving the base to slide horizontally along the frame until the carrier plate is in contact with the casing, positioning the casing between the two sets of side stops. Then, the push-off cylinder starts simultaneously, clamping the casing with its ejector end. The process begins with horizontal clamping and positioning of the outer shell. Then, the top and side cylinders reset, and the bottom cylinder activates. The piston rod drives the bottom plate vertically downwards along the support column until the bottom of the mesh plate is tightly fitted against the top surface of the outer shell. Subsequently, the front, push, and top cylinders activate in tandem. The top cylinder drives the scraper to press firmly against the mesh plate, and the screw and spring provide cushioning, adjusting the pressure of the scraper on the mesh plate. The front and push cylinders then move the scraper, ensuring it slides at a uniform speed on the mesh plate, thus securing the mesh plate... The ink on the screen is transferred to the surface of the outer shell through the mesh, completing the screen printing. After the screen printing is completed, the lower top cylinder resets, the screen rises and detaches from the outer shell, the side push cylinder pushes it out, and then the top push cylinder retracts, making the support plate stand upright, so that the outer shell is placed back on the upper top plate. The back push cylinder retracts, and then the upper top cylinder retracts, so that the screen-printed outer shell returns to the double belt conveyor for transfer. At the same time, the side push cylinder pushes it out, so that the stop bar returns to its position. Therefore, the outer shell is transported through the double belt conveyor, and then the above operation is repeated to achieve continuous screen printing.

[0025] The entire workflow is now complete, and anything not described in detail in this specification is existing technology known to those skilled in the art.

[0026] It should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silk screen printing machine for plastic shell, comprising a frame (1), a double-belt conveying table (2) is installed on the frame (1), a stand (10) is fixed on one side of the double-belt conveying table (2), a silk screen printing assembly (4) is installed on the stand (10), characterized in that: The stand (10) is also equipped with a turning table assembly (5), and the bottom of the double belt conveyor (2) is fixed with a base plate (6). A pusher is installed on the base plate (6), and the pusher is fixed with an upper top plate (9) that can pass through the gap of the double belt conveyor (2). The flip-top assembly (5) includes a base (51) that slides with the upright (10), a bearing plate (54) is hinged on the base (51), a pair of side rails (57) are fixed on the bearing plate (54), and a clamping part located between the side rails (57) is also fixed. A flip-pushing part is also installed on the base (51), and the flipping end of the flip-pushing part is hinged to the bearing plate (54).

2. A silk screening machine for plastic shells as claimed in claim 1 wherein: The flipping and pushing part includes a push cylinder (53) mounted on the base (51) and a pair of side push cylinders (55) hinged to the base (51). A standing plate (52) is fixed on the stand (10). The piston rod of the push cylinder (53) is fixed to the standing plate (52), and the piston rod of the side push cylinder (55) is hinged to the bearing plate (54).

3. A screen printer for plastic enclosures as defined in claim 2, wherein: A stop (58) is fixed on one side of the base (51) and located below the support plate (54) to support the support plate (54).

4. A screen printer for plastic enclosures as defined in claim 1, wherein: The clamping part is a pair of push cylinders (56) fixed on the support plate (54).

5. A silk screening machine for plastic shells as claimed in claim 1 wherein: The pusher includes an upper cylinder (7) installed at the bottom of the base plate (6) and a pair of guide rods (8) passing through it. The piston rod of the upper cylinder (7) is fixed to the upper plate (9), and the top of the guide rods (8) is also fixed to the upper plate (9).

6. A screen printer for plastic enclosures as defined in claim 1, wherein: A limiting component (3) is fixed on the platform (1) on the other side of the double belt conveyor (2) and opposite to the upright (10). The limiting component (3) includes a side plate (33) and a pair of platform plates (31) fixed on the platform (1). A long plate (32) is fixed between the platform plates (31). A side push cylinder (34) and a stop rod (35) are hinged on the side plate (33). The piston rod of the side push cylinder (34) is hinged to one end of the stop rod (35).

7. A screen printer for plastic enclosures as defined in claim 1, wherein: The screen printing assembly (4) includes a lower top cylinder (41) installed on the top of the stand (10). The piston rod of the lower top cylinder (41) is fixed to a lower top plate (42) that slides between the upper column of the stand (10). A screen plate (43) located above the support plate (54) is fixed to the side of the bottom of the lower top plate (42). A front push cylinder (44) is installed on the top of the lower top plate (42). A push cylinder (45) is fixed to the piston rod of the front push cylinder (44). A top push cylinder (46) is fixed to the piston rod of the push cylinder (45). Two sets of screws (47) are threaded to the ejector end of the top push cylinder (46). A frame rod (49) is provided between the screws (47). The frame rod (49) is in the shape of a mountain and a scraper (410) that can be located in the screen plate (43) is installed at the bottom. A spring (48) is sleeved on the outside of the screw (47).

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