Automatic slurry detecting and supplementing device for screen printing machine

Abstract

The utility model relates to the technical field of screen printing equipment, in particular to an automatic slurry detecting and supplementing device for a screen printing machine, which comprises a screen printing machine body and a slurry supplementing mechanism arranged at one end of the screen printing machine body. The screen printing machine body comprises a base, a printing machine head, a PLC (programmable logic controller) and a counting sensor, the slurry supplementing mechanism comprises a slurry storage hopper, a laser range finder, a liquid level meter and a storage box, the device can judge the stock of slurry above a screen printing plate by automatically detecting the thickness change of the slurry above the screen printing plate after the slurry is flatly laid, and the slurry is supplemented in time; according to different models of screen printing machines and screen printing plates, the slurry supplementing rate can be adjusted, it is guaranteed that ink return is even, the phenomena of skip printing and uneven printing are avoided, the printing quality and efficiency are guaranteed, the defect rate of printed matter is reduced, and resource waste is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of screen printing equipment, and specifically discloses an automatic slurry detection and replenishment device for a screen printing machine. Background Art

[0002] Screen printing machine is a kind of printing machine that uses screen printing plate to print. Screen printing machine is a more representative printing equipment among stencil printing machines. It can be divided into flat screen printing machine, curved screen printing machine and rotary screen printing machine. In the process of using screen printing machine, there are usually two ways to replenish slurry: automatic slurry replenishing device and manual replenishment. In the process of replenishing slurry, the existing automatic slurry replenishing device replenishes slurry according to the preset replenishment rate. Due to the differences between screen printing machines and screens, when the same replenishment rate is applied to different screens and screen printing machines, it often results in untimely replenishment and excessive replenishment. When replenishment is untimely, , which will lead to insufficient ink return of the slurry, no slurry on the screen printing area, missing printing and uneven printing, and it will take time to reprint and reprint. When the amount of replenishment is excessive, it will lead to insufficient ink return, resulting in drag printing, which will affect the printing efficiency and quality to a certain extent. The manual replenishment of slurry requires workers to replenish it at irregular intervals according to the remaining slurry on the screen. The working status of the workers can easily affect the replenishment efficiency, resulting in untimely replenishment, and the manual replenishment of slurry is not conducive to saving labor costs. Therefore, in order to solve the above problems, the utility model proposes an automatic slurry detection and replenishment device for a screen printing machine. Utility Model Content

[0003] The utility model aims to provide an automatic slurry detection and replenishment device for a screen printing machine, which can automatically detect the thickness change of the slurry above the screen after it is laid flat, judge the stock of the slurry above the screen, and replenish the slurry in time, and can adjust the slurry replenishment rate according to different screen printing machines and screen models to ensure uniform ink return, avoid missed printing and uneven printing, ensure the quality and efficiency of printing, reduce the defective rate of printed products, and reduce waste of resources.

[0004] The utility model is realized by the following technical solutions:

[0005] An automatic slurry detection and replenishment device for a screen printing machine comprises a screen printing machine body and a slurry replenishment mechanism, wherein the slurry replenishment mechanism is arranged at one end of the screen printing machine body, the screen printing machine body comprises a base, a printing head, a PLC controller and a counting sensor, and the slurry replenishment mechanism comprises a slurry storage hopper, a laser rangefinder, a liquid level meter and a storage box.

[0006] As a further configuration of the above scheme, a PLC controller is provided on one side of the base, a screen is connected to the upper side of the base, a printing head is provided above the screen, ink return blades and scrapers are respectively connected to the two sides below the printing head, and a counting sensor is connected to one end of the screen. The above design facilitates the control of the operation of the printing press to print related materials, and can calculate the number of times the ink return blade and the scraper run, laying the foundation for subsequent judgment of the slurry inventory above the screen.

[0007] As a further configuration of the above scheme, the upper and lower ends of the pulp storage bucket are respectively connected with a top cover and a pulp outlet pipe, one end of the pulp outlet pipe is provided with a solenoid valve, the lower end of the pulp outlet pipe is connected with a liquid guide pipe, and the two sides of the pulp outlet pipe are respectively provided with a first connecting frame and a second connecting frame, the two ends of the first connecting frame are respectively connected to the pulp storage bucket and the liquid guide pipe, the inner side of the second connecting frame is connected with a laser rangefinder, the upper side of the pulp storage bucket is provided with a liquid level meter, and the outer side of the pulp storage bucket is connected with a bracket. The above design facilitates the injection of a sufficient amount of liquid into the pulp storage bucket. The slurry is discharged onto the screen through the slurry outlet pipe and the liquid guide pipe. The slurry discharge volume can be controlled and adjusted according to different screen printing machines and screens to match the slurry discharge volume with the screen printing machine and the screen. The distance between the liquid surface after the slurry is spread on the screen and the detection head of the laser rangefinder can be measured in real time, and the height and volume of the slurry consumed in a single printing can be calculated by cooperating with the counting sensor, providing a reference for the opening and closing adjustment of the solenoid valve, and the slurry stock in the slurry storage hopper can be monitored in real time, so that the workers can replenish the slurry storage hopper with sufficient slurry in time.

[0008] As a further arrangement of the above scheme, a counterweight block is provided at the lower end of the bracket, a plurality of universal brake wheels are provided below the counterweight block, a plurality of threaded holes are provided on one side of the counterweight block, a threaded rod is provided through the inside of the threaded hole, an anti-slip pad is connected to the lower end of the threaded rod, a buckle is connected to the outer side of the threaded rod, and a storage box is connected to one side of the bracket. The above design can provide stable support for the slurry storage bucket and its connecting parts, facilitate the adjustment of the position of the slurry replenishing mechanism and fix it, and can avoid the phenomenon of unbalanced weight of the slurry replenishing mechanism, so that the slurry replenishing mechanism remains stable during use.

[0009] As a further configuration of the above scheme, a plurality of partitions are provided inside the storage box, and a plurality of slurry tanks are placed above the partitions. The above design can store a plurality of slurry tanks in layers, making it convenient for workers to use them.

[0010] As a further configuration of the above scheme, the counting sensor, solenoid valve, laser rangefinder and liquid level meter are all connected to the PLC controller through electrical signals. The above design facilitates adjustment of the connection relationship and operating frequency of the above components in the PLC controller, so as to adjust the slurry replenishment rate according to the differences in the screen printing machine and the screen, thereby realizing automatic and stable replenishment of the slurry. Beneficial Effects

[0011] The combined use of the laser rangefinder and the solenoid valve can measure and calculate the distance between the laser rangefinder detection head and the screen and the height difference between the slurry liquid surface after the slurry is flattened by a single opening and closing of the solenoid valve and the detection head. The use of the counting sensor can calculate the number of times the ink return knife and the scraper run, and calculate and obtain the corresponding values ​​in the PLC controller. According to the obtained values, the early warning values ​​matching the counting sensor, laser rangefinder and solenoid valve are calculated, and the laser rangefinder, counting sensor and solenoid valve are connected to achieve the purpose of automatic detection and replenishment of the slurry.

[0012] The combination of the universal brake wheel and the threaded rod makes it easy to adjust the position of the slurry replenishing mechanism and fix it. The use of the counterweight block can prevent the slurry replenishing mechanism from being overweight, so that the slurry replenishing mechanism remains stable during use. The use of the storage box and partitions makes it easy to place multiple slurry tanks in layers, which is convenient for workers to use. There is enough space between the storage box and the counterweight block, so that the slurry replenishing mechanism can be used for both the printing line and the single printing operation of the screen printing machine, enriching the scope of application of the device and improving the utilization rate of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 is a perspective view of the utility model;

[0015] Figure 2 It is a combination diagram of the screen plate and the counting sensor of the utility model;

[0016] Figure 3 It is a first perspective view of the slurry replenishing mechanism in the utility model;

[0017] Figure 4 It is a second perspective view of the slurry replenishing mechanism in the utility model.

[0018] In the figure: 1. screen printing machine body; 2. slurry replenishing mechanism; 3. slurry tank; 11. base; 12. printing head; 121. ink return knife; 122. scraper; 13. PLC controller; 14. screen; 15. counting sensor; 21. slurry storage bucket; 211. top cover; 212. slurry outlet pipe; 213. solenoid valve; 214. liquid guide pipe; 215. first connecting frame; 22. second connecting frame; 23. laser rangefinder; 24. liquid level meter; 25. bracket; 26. counterweight; 261. universal brake wheel; 262. threaded hole; 263. threaded rod; 264. anti-slip pad; 265. buckle; 27. storage box; 271. partition. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 4 , and describes the application in detail with reference to embodiments.

[0021] The embodiment discloses an automatic slurry detection and replenishment device for a screen printing machine, comprising a screen printing machine body 1 and a slurry replenishing mechanism 2, wherein the slurry replenishing mechanism 2 is arranged at one end of the screen printing machine body 1, the screen printing machine body 1 comprises a base 11, a printing head 12, a PLC controller 13 and a counting sensor 15, and the slurry replenishing mechanism 2 comprises a slurry storage bucket 21, a laser rangefinder 23, a liquid level meter 24 and a storage box 27.

[0022] like Figure 1 and Figure 2 As shown, a PLC controller 13 is provided on one side of the base 11, a screen 14 is connected to the upper side of the base 11, a printing head 12 is provided above the screen 14, and ink return blades 121 and scrapers 122 are respectively connected to the lower sides of the printing head 12. A counting sensor 15 is connected to one end of the screen 14 to facilitate controlling the operation of the printing press to print related materials. The counting sensor 15 can calculate the number of times the ink return blade 121 and the scraper 122 run, laying a foundation for subsequent judgment of the slurry inventory above the screen 14.

[0023] like Figure 1 , Figure 3 and Figure 4As shown, the upper and lower ends of the pulp storage bucket 21 are respectively connected with a top cover 211 and a pulp discharge pipe 212, one end of the pulp discharge pipe 212 is provided with a solenoid valve 213, the lower end of the pulp discharge pipe 212 is connected with a liquid guide pipe 241, and the two sides of the pulp discharge pipe 212 are respectively provided with a first connecting frame 215 and a second connecting frame 22, the two ends of the first connecting frame 215 are respectively connected to the pulp storage bucket 21 and the liquid guide pipe 241, the inner side of the second connecting frame 22 is connected with a laser rangefinder 23, the upper side of the pulp storage bucket 21 is provided with a liquid level meter 24, and the outer side of the pulp storage bucket 21 is connected with a bracket 25, which is convenient for pumping liquid into the pulp storage bucket 21. A sufficient amount of slurry is injected into the screen 14 and discharged onto the screen 14 through the slurry outlet pipe 212 and the liquid guide pipe 241. The slurry discharge volume can be controlled and adjusted according to different screen printing machines and screens 14, so that the slurry discharge volume matches the screen printing machine and the screen 14. The distance between the liquid surface after the slurry is spread on the screen 14 and the detection head of the laser rangefinder 23 can be measured in real time, and the height and volume of the slurry consumed in a single printing can be calculated by cooperating with the counting sensor 15, providing a reference for the opening and closing adjustment of the solenoid valve 213, and the stock of the slurry in the slurry storage bucket 21 can be monitored in real time, so that the workers can replenish the slurry storage bucket 21 with a sufficient amount of slurry in time.

[0024] like Figure 1 , Figure 3 and Figure 4 As shown, a counterweight block 26 is provided at the lower end of the bracket 25, and a plurality of universal brake wheels 261 are provided below the counterweight block 26. A plurality of threaded holes 262 are provided on one side of the counterweight block 26, and a threaded rod 263 is provided inside the threaded hole 262. An anti-slip pad 264 is connected to the lower end of the threaded rod 263, and a buckle 265 is connected to the outer side of the threaded rod 263. A storage box 27 is connected to one side of the bracket 25, which can provide stable support for the slurry storage bucket 21 and its connecting parts, facilitate the adjustment of the position of the slurry replenishing mechanism 2 and fix it, and can avoid the phenomenon of unbalanced weight of the slurry replenishing mechanism 2, so that the slurry replenishing mechanism 2 remains stable during use.

[0025] like Figure 1 , Figure 3 and Figure 4 As shown, a plurality of partitions 271 are provided inside the storage box 27, and a plurality of slurry tanks 3 are placed above the partitions 271, so that the plurality of slurry tanks 3 can be stored in layers for easy access by workers.

[0026] like Figure 1As shown, the counting sensor 15, the solenoid valve 213, the laser rangefinder 23 and the liquid level meter 24 are all connected to the PLC controller 13 through electrical signals, so that the connection relationship and the operating frequency of the above components can be adjusted in the PLC controller 13, so as to adjust the slurry replenishment rate according to the screen printing machine and the screen 14, thereby realizing automatic and stable replenishment of the slurry.

[0027] The automatic slurry detection and replenishment device for a screen printing machine disclosed in this embodiment, before use, open the top cover 211, pour a sufficient amount of slurry into the slurry storage bucket 21, close the top cover 211, set the warning value of the liquid level meter 24 in the PLC controller 13, use the laser rangefinder 23 to measure the distance between the detection head of the laser rangefinder 23 and the screen 14, and transmit the measured data to the PLC controller 13 in real time. Then, use the PLC controller 13 to preliminarily set the opening and closing time of the electromagnetic valve 213, set it to H, and open the electromagnetic valve 213, so that the slurry in the slurry storage bucket 21 is released to the screen 14 through the slurry outlet pipe 212 and the liquid guide pipe 241, and measure the slurry liquid level after the slurry is spread and the slurry level after the slurry is spread. The distance between the detection heads is calculated in the PLC controller 13 by measuring the height difference between the two sides, which is set as A. Then, the warning value of the counting sensor 15 is preliminarily set on the PLC controller 13, which is set as B. The printing head 12 and the counting sensor 15 are started by the PLC controller 13 to print. During the printing process, the counting sensor 15 calculates the number of times the ink return knife 121 and the scraper 122 run. After printing B amount of materials, the value of B is adjusted according to the remaining amount of slurry on the screen 14, so that after printing B sheets of materials, there is still a certain amount of slurry on the screen 14. The printing head 12 is closed, and the laser rangefinder 23 is used again to measure the distance between the slurry liquid level and the laser rangefinder 23. Set it as C, and transmit the measured data to the PLC controller 13. In the PLC controller 13, subtract C from A to get the height of the slurry consumed by printing B quantity of materials, set it as D, and then divide the obtained height D by B to get the height E of the slurry consumed by printing one sheet of material. Then set the time for the electromagnetic valve 213 to be opened for the slurry consumed by printing B quantity of materials as h, use the formula: HC×H÷A to get the value of h, and then divide h by B to get the time for the electromagnetic valve 213 to be opened for the slurry used to print one sheet of material, set it as M, and then adjust the electromagnetic valve 213, the laser rangefinder 23 and the counting sensor in the PLC controller 13 according to the obtained data. 15, so that the warning value of the laser rangefinder 23 is greater than or equal to C, the warning value of the laser rangefinder 23 is divided by E to obtain the corresponding warning value of the counting sensor 15, and the warning value of the counting sensor 15 is multiplied by M to obtain the opening and closing gap of the electromagnetic valve 213. According to the warning value and the opening and closing gap, the counting sensor 15, the laser rangefinder 23 and the electromagnetic valve 213 are adjusted to be linked in the running program of the PLC controller 13, that is, when the laser rangefinder 23 and the counting sensor 15 reach the warning value, the electromagnetic valve 213 is automatically opened, and when the opening time of the electromagnetic valve 213 is reached, the electromagnetic valve 213 is closed, and the warning prompt is closed, thereby realizing the purpose of automatic detection and replenishment of slurry.

[0028] When the liquid level of the slurry in the slurry storage bucket 21 reaches the warning value of the liquid level meter 24, the PLC controller 13 issues a voice prompt. After hearing the prompt, the staff promptly takes out a sufficient amount of slurry tank 3 from the storage box 27, opens the top cover 211, and pours the slurry in the slurry tank 3 into the slurry storage bucket 21 in turn, and then covers the top cover 211.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic slurry detection and replenishment device for a screen printing machine, comprising a screen printing machine body and a slurry replenishment mechanism, characterized in that: A slurry replenishing mechanism is arranged at one end of the screen printing machine body. The screen printing machine body comprises a base, a printing head, a PLC controller and a counting sensor. The slurry replenishing mechanism comprises a slurry storage hopper, a laser rangefinder, a liquid level meter and a storage box.

2. The automatic slurry detection and replenishment device for a screen printing machine according to claim 1, characterized in that: A PLC controller is arranged on one side of the base, a screen is connected to one side above the base, a printing head is arranged above the screen, an ink return knife and a scraper are respectively connected to the two sides below the printing head, and a counting sensor is connected to one end of the screen.

3. The automatic slurry detection and replenishment device for a screen printing machine according to claim 1, characterized in that: The upper and lower ends of the slurry storage bucket are respectively connected with a top cover and a slurry discharge pipe, one end of the slurry discharge pipe is provided with a solenoid valve, the lower end of the slurry discharge pipe is connected with a liquid guide pipe, the two sides of the slurry discharge pipe are respectively provided with a first connecting frame and a second connecting frame, the two ends of the first connecting frame are respectively connected with the slurry storage bucket and the liquid guide pipe, the inner side of the second connecting frame is connected with a laser rangefinder, a liquid level meter is provided on the upper side of the slurry storage bucket, and the outer side of the slurry storage bucket is connected with a bracket.

4. The automatic slurry detection and replenishment device for a screen printing machine according to claim 3, characterized in that: A counterweight block is provided at the lower end of the bracket, and a plurality of universal brake wheels are provided below the counterweight block. A plurality of threaded holes are provided on one side of the counterweight block, and a threaded rod is provided passing through the threaded hole. An anti-slip pad is connected to the lower end of the threaded rod, and a buckle is connected to the outer side of the threaded rod. A storage box is connected to one side of the bracket.

5. The automatic slurry detection and replenishment device for a screen printing machine according to claim 4, characterized in that: A plurality of partitions are arranged inside the storage box, and a plurality of slurry tanks are placed above the partitions.

6. The automatic slurry detection and replenishment device for a screen printing machine according to claim 1, characterized in that: The counting sensor, electromagnetic valve, laser distance meter and liquid level meter are all connected with the PLC controller through electrical signals.

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