Printing ink preheating device of pad printing equipment

Abstract

The utility model provides a printing ink preheating device of pad printing equipment, which comprises a first air duct arranged around the peripheral side of a positioning table for positioning a workpiece, an air inlet pipe for enabling airflow to enter the first air duct, and an electric heating device for heating the airflow entering the first air duct, and an air outlet gap for obliquely and upwards discharging air is formed around the inner circumferential side of the first air duct. Due to the fact that the first air channel is arranged around the positioning table, in the process that the glue head descends to conduct transfer printing, hot air is blown out obliquely upwards from the air outlet gap, in other words, preheating of printing ink can be completed through the hot air in the descending process of the glue head, and compared with the prior art, the equipment structural layout is simplified, and the production efficiency is improved; due to the fact that hot air is actively blown to the ink on the bottom face of the rubber head from the air outlet gaps distributed in the circumferential direction, the hot air flow speed is high, ink heating is more uniform, the heating time is further shortened, and the printing quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pad printing equipment, in particular to a preheating device for preheating ink to be pad printed on a silicone head. Background Art

[0002] With the rapid development of electronic devices such as mobile phones, tablet computers, and smart watches, the production equipment that supports them also needs to be updated and iterated. Among them, pad printing equipment for printing ink on the frame of the glass panel of electronic products is one of them. Traditional pad printing equipment usually needs to be set up with a printing plate engraved with a pattern, an oil pan for inking the printing plate, a mobile rubber head for transfer, a heating device for preheating the ink on the rubber head, a positioning table for positioning the glass, and a cleaning component for removing the residual ink on the rubber head. Among them, the heating device of the existing pad printing equipment is usually set independently. During the production process, the rubber head needs to be moved to the heating device for ink preheating and then moved to the next process for transfer. Since the ink preheating effect will directly affect the transfer quality, it is necessary to ensure the heating time, which makes the production efficiency of the equipment low. In addition, in the process of heating the ink, due to the uneven heat distribution and the overall short heating time, it is difficult to achieve uniform preheating of the ink at various positions on the rubber strip, thereby affecting the printing quality. Therefore, it is necessary to improve the existing equipment. Utility Model Content

[0003] The utility model aims to provide an ink preheating device for pad printing equipment with high production efficiency and uniform heating.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An ink preheating device for pad printing equipment includes a first air duct arranged around the outer peripheral side of a positioning table for positioning a workpiece, an air inlet pipe for allowing air flow to enter the first air duct, and an electric heating device for heating the air flow entering the first air duct, and an air outlet gap for obliquely discharging air upwards is arranged around the inner peripheral side of the first air duct.

[0006] A preferred solution also includes a second air duct arranged at intervals on the outer peripheral side of the first air duct, the air inlet pipe is connected to the head end of the second air duct, and the tail end of the second air duct is provided with an air outlet, and a solenoid valve for controlling the opening and closing of the air outlet, the second air duct is connected to the first air duct through a plurality of guide gaps evenly distributed along the extension direction of the air duct, the guide gaps are arranged obliquely so that the airflow direction in the guide gaps is opposite to the air inlet direction in the second air duct.

[0007] In a preferred embodiment, the electric heating device is arranged on the outer periphery of the air inlet pipe at the head end of the second air duct.

[0008] In a preferred embodiment, the preheating device includes a first flat plate and a second flat plate which are arranged in a vertical manner, the top surface of the second flat plate below is formed with the first air duct, the second air duct, and the guide gap which are concave, and the first flat plate above closes the top surfaces of the first air duct, the second air duct, and the guide gap.

[0009] In a preferred embodiment, the first flat plate and the second flat plate are both provided with an air outlet inclined surface connected to the first air duct around the inner circumference, and a gap is provided between the two air outlet inclined surfaces to form the air outlet gap.

[0010] In a preferred embodiment, the inner side walls of the first flat plate and the second flat plate are both wind-guiding inclined surfaces that expand upward.

[0011] In a preferred embodiment, the inner circumference of the second flat plate also extends radially inwardly to form a horizontal wind-shielding step.

[0012] The beneficial effect of the utility model is that since the first air duct is arranged around the positioning table, during the transfer process when the rubber head descends, hot air is blown out obliquely upward from the air outlet gap, that is, the ink can be preheated by the hot air at the same time during the descent of the rubber head. Compared with the prior art, the equipment structure layout is simplified and the production efficiency is improved. Since the hot air is actively blown toward the ink on the bottom surface of the rubber head from the circumferentially distributed air outlet gaps, the hot air flow rate is fast and the ink is heated more evenly, which further shortens the heating time and improves the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the overall installation structure of the preheating device and the positioning platform in the embodiment;

[0015] Figure 2 It is a schematic diagram of the transverse cross-sectional structure of the preheating device in the embodiment;

[0016] Figure 3 Schematic diagram of the partial structure of the longitudinal section of the preheating device in the embodiment. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] It should be noted that the words indicating directions in the present application document, such as above, below, top surface, vertical, etc., are only for the convenience of a more intuitive description of the structure in combination with the drawings, and are not intended to limit the product structure.

[0019] refer to Figures 1 to 3The ink preheating device of a pad printing device of the present embodiment includes a first air duct 2 arranged around the outer peripheral side of a positioning table 1 for positioning a workpiece, an air inlet pipe 3 for allowing air flow to enter the first air duct 2, and an electric heating device 4 for heating the air flow entering the first air duct 2, and an air outlet gap 5 for obliquely discharging air upward is arranged around the inner peripheral side of the first air duct 2.

[0020] During operation, the workpiece to be printed is placed on the positioning table 1 for positioning, and the corresponding rubber head with the ink pattern on the top of the positioning table 1 moves downward to prepare to transfer the ink pattern to the surface of the workpiece. At this time, the external air inlet pipe 3 inputs the pressurized airflow into the first air duct 2, and the airflow is heated by the electric heating device 4 to form hot air, and is blown upward obliquely to the bottom surface of the rubber head through the air outlet gap 5, so that the ink is quickly preheated during the descent of the rubber head. Since the first air duct 2 is arranged around the positioning table 1, the hot air is blown upward obliquely from the air outlet gap 5 during the descent of the rubber head for transfer, that is, the ink can be preheated by hot air at the same time during the descent of the rubber head. Compared with the existing technology, the equipment structure layout is simplified and the production efficiency is improved. Since the hot air is actively blown from the circumferentially distributed air outlet gaps 5 to the ink on the bottom surface of the rubber head, the hot air flow rate is fast and the ink is heated more evenly, which further shortens the heating time and improves the printing quality.

[0021] A preferred solution, this embodiment also includes a second air duct 6 arranged at intervals on the outer peripheral side of the first air duct 2, the air inlet pipe 3 is connected to the head end of the second air duct 6, and the tail end of the second air duct 6 is provided with an air outlet 61, and a solenoid valve 7 for controlling the opening and closing of the air outlet 61, the second air duct 6 is connected to the first air duct 2 through a plurality of guide gaps 8 evenly distributed along the extension direction of the air duct, the guide gaps 8 are arranged obliquely, so that the airflow direction in the guide gaps 8 is opposite to the air intake direction in the second air duct 6. When production starts, the pressurized airflow enters the second air duct 6 from the air inlet pipe 3 and blows out from the air outlet 61 of the second air duct 6. At the same time, the airflow is heated by the electric heating device 4 so that the airflow in the second air duct 6 reaches a preset temperature, and then the air outlet 61 is closed by the solenoid valve 7. At this time, the air pressure in the second air duct 6 increases rapidly, and the airflow flows back and forth in the second air duct 6, so that the temperature of the airflow quickly reaches a uniform state, which improves the heating efficiency of the airflow. In the process of further increasing the air pressure, the heated airflow is forced to enter the first air duct 2 from the guide gap 8 in the opposite direction, and then blown out from the air outlet gap 5 on the inner side of the first air duct 2. As a result, the airflow pressure and temperature distribution in the first air duct 2 are more uniform, so that the preheating effect of the ink is optimal, thereby improving the printing quality. In the process of placing the workpiece into the positioning table 1 in each printing cycle, the solenoid valve 7 can be opened to blow the airflow out from the air outlet 61 of the second air duct 6 to avoid affecting the placement of the workpiece.

[0022] In a preferred embodiment, the electric heating device 4 of this embodiment is arranged on the periphery of the air inlet pipe 3 at the head end of the second air duct 6. The electric heating device 4 is arranged on the periphery of the air inlet pipe 3 at the head end of the second air duct 6. On the one hand, all airflows entering the second air duct 6 are heated, thereby improving the airflow heating efficiency. On the other hand, the heating device is not arranged in the second air duct 6, thereby preventing the local airflow temperature in the second air duct 6 from being too high and affecting the ink preheating effect.

[0023] In a preferred embodiment, the preheating device of this embodiment comprises a first flat plate 9a and a second flat plate 9b which are arranged in a vertically laminated manner, the top surface of the second flat plate 9b at the bottom is formed with the first air duct 2, the second air duct 6, and the guide slit 8 which are concave, and the first flat plate 9a at the top closes the top surfaces of the first air duct 2, the second air duct 6, and the guide slit 8. The processing of the air duct and the guide slit 8 is greatly simplified by making grooves on the second flat plate 9b and closing the top surface with the first flat plate 9a.

[0024] In a preferred embodiment, the first flat plate 9a and the second flat plate 9b of this embodiment are both provided with an air outlet inclined surface connected to the first air duct 2 around the inner circumference, and a gap is provided between the two air outlet inclined surfaces to form the air outlet gap 5. The air outlet gap 5 is formed by the gap between the first flat plate 9a and the second flat plate 9b, which further simplifies the processing of the air outlet gap 5.

[0025] In a preferred embodiment, the inner side walls of the first flat plate 9a and the second flat plate 9b of this embodiment are both upwardly expanded wind guide slopes 10. Compared with a vertical surface, the expanded wind guide slope 10 of the preheating device does not block the air flow from the side walls and can be more evenly and obliquely blown upward to the ink on the rubber head.

[0026] In a preferred embodiment, the inner circumference of the second flat plate 9b of this embodiment further extends radially inwardly to form a horizontal windshield step 11. The windshield step 11 can limit the downward flow of the blown airflow, avoid heat loss, and prevent the hot air from causing the workpiece on the positioning table 1 to move or be heated.

[0027] The above description does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ink preheating device for pad printing equipment, characterized in that: It includes a first air duct arranged around the outer peripheral side of a positioning table for positioning a workpiece, an air inlet pipe for allowing air flow to enter the first air duct, and an electric heating device for heating the air flow entering the first air duct. An air outlet gap for obliquely discharging air upwards is arranged around the inner peripheral side of the first air duct.

2. The ink preheating device of a pad printing device according to claim 1, characterized in that: It also includes a second air duct arranged at intervals on the outer peripheral side of the first air duct, the air inlet pipe is connected to the head end of the second air duct, and the tail end of the second air duct is provided with an air outlet, and a solenoid valve for controlling the opening and closing of the air outlet, the second air duct is connected to the first air duct through a plurality of guide gaps evenly distributed along the extension direction of the air duct, the guide gaps are arranged obliquely, so that the airflow direction in the guide gaps is opposite to the air inlet direction in the second air duct.

3. The ink preheating device of a pad printing device according to claim 2, characterized in that: The electric heating device is arranged on the outer periphery of the air inlet pipe at the head end of the second air duct.

4. The ink preheating device of a pad printing device according to claim 2, characterized in that: The preheating device includes a first flat plate and a second flat plate which are arranged in a vertical manner. The top surface of the second flat plate below is formed with the first air duct, the second air duct, and the guide gap which are concave, and the first flat plate above closes the top surfaces of the first air duct, the second air duct, and the guide gap.

5. The ink preheating device of pad printing equipment according to claim 4, characterized in that: The first flat plate and the second flat plate are both provided with an air outlet inclined surface connected to the first air duct around the inner circumference, and a gap is provided between the two air outlet inclined surfaces to form the air outlet gap.

6. The ink preheating device of pad printing equipment according to claim 5, characterized in that: The inner side walls of the first flat plate and the second flat plate are both wind guiding inclined surfaces expanding upward.

7. The ink preheating device of pad printing equipment according to claim 6, characterized in that: The inner circumference of the second flat plate also extends radially inward to form a horizontal wind-shielding step.

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