Vacuum protection system for glass cover plate engraving and milling machine workshop

Abstract

The vacuum protection system is used for the glass cover plate engraving and milling workshop, a power distribution cabinet, a CNC engraving and milling machine table, a pressure storage tank and a water cooling tower are arranged in the workshop, the pressure storage tank and the water cooling tower are connected through a circulating pipeline, a water supply circulating pump and a vacuum pump, and the water cooling tower is connected with a pure water supplementing pipeline. The vacuum protection system comprises a floating ball switch installed in the water cooling tower, a first negative pressure meter installed on the pressure storage tank and an alarm element in electric signal connection with the power distribution cabinet, the power distribution cabinet is provided with an intermediate relay and a frequency converter, and the intermediate relay is provided with a plurality of switches. Wherein the circulating pipeline comprises a water return pipeline and a water supply pipeline, the water return pipeline is connected with the pressure storage tank through the vacuum pump, the water supply pipeline is connected with the bottom of the water cooling tower and the vacuum pump, the water supply circulating pump is arranged on the water supply pipeline, and the float switch, the first negative pressure meter, the power distribution cabinet and the electromagnetic valve are in electric signal connection, so that the overall vacuum degree stability of the workshop can be maintained.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for glass cover plate processing, and in particular to a vacuum protection system for a glass cover plate engraving machine workshop. Background Technology

[0002] The glass cover plate engraving workshop has a high degree of automation. It often requires vacuum adsorption of glass for processing and feeding, and has high requirements for the overall vacuum degree and requires the vacuum degree to be stable.

[0003] In actual production, the number of machines in operation is unstable due to factors such as planned production output and shift handover. If fewer machines are in operation, it can easily lead to increased vacuum consumption, which in turn increases the vacuum of normally operating machines. In addition, high circulating water temperature or insufficient water supply in summer can affect the overall vacuum level and cause it to decrease.

[0004] When the overall vacuum level is high, the vacuum pump will be under greater load, and the pump body will be prone to vibration, which will affect the life of the vacuum pump. In addition, it will also cause product deformation or even product breakage when vacuum adsorption and gripping glass. When the overall vacuum level is low, the adsorption force is weak, and it is easy to fail to adsorb products. All machines will alarm on site, affecting production capacity and increasing scrap rate.

[0005] In addition, vacuum pump rooms are usually independent and unattended. By the time inspections reveal that the vacuum pump is vibrating excessively or that the water supply is insufficient, the vacuum pump (which is quite valuable, costing 8,000 yuan per unit) has already been damaged, or the mechanical seal of the pump head has been damaged due to high temperature, affecting the pump's lifespan and increasing downtime. Utility Model Content

[0006] This application provides a vacuum protection system for a glass cover plate engraving machine workshop, which can maintain a stable vacuum level in the glass cover plate engraving workshop at a low cost, and can save manpower, save energy, and ensure the safe use of equipment.

[0007] This application provides a vacuum protection system for a glass cover plate engraving machine workshop. The workshop includes a power distribution cabinet, a CNC engraving machine, a pressure tank, and a cooling tower connected in sequence. The pressure tank and the cooling tower are connected via a circulation pipeline, a water circulation pump, and a vacuum pump. The pressure tank provides negative pressure to the CNC engraving machine. The cooling tower is connected to a pure water inlet pipeline equipped with a solenoid valve. The vacuum protection system includes a float installed inside the cooling tower to monitor the water level. The system includes a switch, a first negative pressure gauge installed on the pressure tank, and an alarm element electrically connected to the distribution cabinet. The distribution cabinet is equipped with an intermediate relay and a frequency converter for controlling the vacuum pump. The intermediate relay has multiple switches. The circulation pipeline includes a return water pipeline and a supply water pipeline. The return water pipeline is connected to the pressure tank through the vacuum pump. The supply water pipeline is connected to the bottom of the cooling tower and the vacuum pump. The supply water circulation pump is located on the supply water pipeline. The float switch, the first negative pressure gauge, the distribution cabinet, and the solenoid valve are electrically connected.

[0008] In one possible implementation, the power distribution cabinet is also equipped with a start button, which is electrically connected to the frequency converter to control the forward and reverse rotation of the vacuum pump through the frequency converter.

[0009] In one possible implementation, the first negative pressure gauge is a mechanical negative pressure gauge.

[0010] In one possible implementation, a second negative pressure gauge is also installed on the distribution cabinet, and the second negative pressure gauge is connected to the alarm element via the electrical signal of the intermediate relay.

[0011] In one possible implementation, the alarm element is an alarm horn or a combination of an alarm horn and a flashing light.

[0012] In one possible implementation, the CNC engraving machine is also connected to a pressure relief pipe, and a pressure relief solenoid valve is provided on the pressure relief pipe. The pressure relief solenoid valve is electrically connected to the intermediate relay.

[0013] In one possible implementation, the pressure relief pipeline is further provided with a manual ball valve, which is located downstream of the pressure relief solenoid valve.

[0014] In one possible implementation, the CNC engraving machine is also connected to a pressure stabilizing pipe, the end of which is equipped with a pressure stabilizing tank, and the pressure relief pipe is connected to the pressure stabilizing pipe.

[0015] In one possible implementation, an adjustable negative pressure valve is provided on the pipe connecting the pressure tank and the CNC engraving machine.

[0016] Beneficial effects: Compared with the prior art, the vacuum protection system for the glass cover plate engraving machine workshop provided in this application can control the replenishment of pure water through a solenoid valve when the float switch detects that the water level in the cooling tower has dropped to a predetermined height. This prevents the cooling tower from becoming too dry, which would cause the vacuum pump to fail to reach its full performance and thus reduce the overall vacuum level of the workshop. By feeding back the pressure of the pressure tank to the frequency converter through the first negative pressure gauge, the pressure in the system can be adjusted by the vacuum pump. This ensures that the overall vacuum level of the workshop is maintained within a stable range, preventing the vacuum from being too high or too low. This avoids damage to the equipment due to vacuum issues, ensures the stability of vacuum adsorption products, reduces scrap rates, and minimizes downtime. Furthermore, the overall cost of this vacuum protection system is low.

[0017] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0018] Figure 1 A schematic diagram of the vacuum protection system for a glass cover plate engraving machine workshop is shown.

[0019] Figure 2 A schematic diagram of the pressure regulation principle in this application is shown.

[0020] Figure 3 A schematic diagram illustrating the controlled principle of the solenoid valve and the pressure relief solenoid valve in this application is shown.

[0021] Figure 4 A schematic diagram of the control principle of the frequency converter in this application is shown. Detailed Implementation

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, the above terms should not be construed as limitations on this utility model.

[0024] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0025] refer to Figures 1 to 4 This application provides a vacuum protection system for a glass cover plate engraving machine workshop. The glass cover plate engraving workshop is equipped with a power distribution cabinet, a CNC engraving machine, a pressure tank, and a cooling tower connected in sequence. The pressure tank and the cooling tower are connected by a circulation pipeline, a water supply circulation pump 11, and a vacuum pump 12. The pressure tank provides negative pressure to the CNC engraving machine. The cooling tower is connected to a pure water supply pipeline S1, and the pure water supply pipeline S1 is equipped with a solenoid valve YV2, which controls the supply of pure water to the cooling tower at appropriate times. The vacuum protection system includes a float switch SF installed in the cooling tower to monitor the water level, a first negative pressure gauge P1 installed on the pressure tank, and an alarm element HA connected to the distribution cabinet by an electrical signal. The distribution cabinet is equipped with an intermediate relay and a frequency converter (such as a Delta MS300 frequency converter) for controlling the vacuum pump 12. The intermediate relay is equipped with multiple switches, such as a first switch KA1, a second switch KA2, a third switch KA3, and a fourth switch KA4.

[0026] In addition, the circulation pipeline includes a return water pipeline S2, a supply water pipeline S3, and a supply water overflow pipeline S4. The return water pipeline S2 is connected to the pressure tank through the vacuum pump 12. The supply water pipeline S3 is connected to the bottom of the cooling tower and the vacuum pump 12. The supply water circulation pump 11 is installed on the supply water pipeline S3. One end of the supply water overflow pipeline S4 is connected to the upper part of the cooling tower, and the other end of the supply water overflow pipeline S4 is connected between the supply water circulation pump 11 and the vacuum pump 12. The supply water overflow pipeline S4 is equipped with a supply water overflow valve. At the same time, the float switch SF, the first negative pressure gauge P1, the power distribution cabinet, and the solenoid valve YV2 are electrically connected.

[0027] The specific tasks are as follows:

[0028] When the float switch SF detects that the water level in the cooling tower has dropped to a predetermined height or reached a predetermined water level, the fourth switch KA4 of the intermediate relay is activated, which in turn triggers the solenoid valve YV2 to open. Pure water is then supplied to the cooling tower through the pure water supply pipeline S1, which can prevent the cooling tower from being unable to meet the performance requirements of the vacuum pump 12 due to lack of water, thus preventing a decrease in the overall vacuum level of the workshop.

[0029] When the pressure of the pressure tank is set to be below -45 kPa, it is considered a low pressure condition, and the first switch KA1 will output. When the pressure of the pressure tank is set to be above -85 kPa, it is considered a high pressure condition, and the second switch KA2 will output.

[0030] When the first negative pressure gauge P1 detects low pressure in the pressure tank, the first switch KA1 is activated, the inverter terminal MI5 receives a signal, and the inverter runs at high speed of 60Hz to quickly increase the system pressure; at the same time, the field alarm element HA sounds to remind the operator to pay attention to the pressure.

[0031] When the first negative pressure gauge P1 detects high pressure in the pressure tank, the second switch KA2 is activated, the inverter terminal MI3 receives a signal, and the inverter runs at a low speed of 30Hz.

[0032] When the first negative pressure gauge P1 detects that the pressure inside the pressure tank is maintained between -45kpa and -85kpa, neither the first switch KA1 nor the second switch KA2 will activate. The inverter terminal MI4 receives a signal and the inverter runs at 50Hz.

[0033] Therefore, the vacuum protection system for glass cover plate engraving machine workshops provided in this application, through the cooperation of the aforementioned components and with the help of existing equipment in the glass cover plate engraving machine workshops, can effectively maintain the overall vacuum level of the glass cover plate engraving machine workshop within a preset range, thereby ensuring the stability of the vacuum level and preventing it from being too high or too low. This can effectively protect the various components and prevent them from being damaged, thus saving equipment costs. In addition, by maintaining the stability of the vacuum level, the stability of vacuum adsorption products can also be ensured, reducing the product scrap rate and saving costs. Furthermore, the overall cost of this vacuum protection system is low, making it easy to promote and apply on a large scale.

[0034] In one embodiment, a start button SB is also installed on the power distribution cabinet. The start button SB is electrically connected to the frequency converter to control the forward and reverse rotation of the vacuum pump 12. When the start button SB is activated, the frequency converter MI2 receives a signal, allowing the forward and reverse rotation of the vacuum pump 12 to be set according to the on-site conditions, making operation convenient.

[0035] In one embodiment, the first negative pressure gauge P1 is a mechanical negative pressure gauge.

[0036] In one embodiment, a second negative pressure gauge P2 is also installed on the distribution cabinet, and the second negative pressure gauge P2 is connected to the alarm element HA via the intermediate relay electrical signal. When the pressure in the pressure tank reaches the warning value of -90 kPa, the third switch KA3 is activated, and the on-site alarm element HA sounds, which can remind the staff to pay attention to the pressure situation in advance, so as to prevent damage to the vacuum pump 12 or the mechanical seal of the pump head.

[0037] More preferably, the alarm element HA is an alarm horn, or a combination of an alarm horn and a flashing light.

[0038] In one embodiment, the CNC engraving machine is also connected to a pressure relief pipe S5, and a pressure relief solenoid valve YV1 is provided on the pressure relief pipe S5. The pressure relief solenoid valve YV1 is electrically connected to the intermediate relay. Thus, when the pressure in the pressure tank is too high, the second switch KA2 outputs, and the pressure is relieved through the cooperation of the pressure relief solenoid valve YV1 and the pressure relief pipe S5.

[0039] More preferably, the pressure relief pipe S5 is also equipped with a manual ball valve 13, wherein the manual ball valve 13 is located downstream of the pressure relief solenoid valve YV1, so that the pressure relief size can be adjusted according to the site conditions to keep the system pressure within the required range, and the operation is convenient.

[0040] In one embodiment, the CNC engraving machine is also connected to a pressure stabilizing pipe S6, and a pressure stabilizing tank is provided at the end of the pressure stabilizing pipe S6. The pressure relief pipe S5 is connected to the pressure stabilizing pipe S6. The pressure stabilizing tank is preferably a 3-ton pressure stabilizing tank, which can effectively maintain the stability of the vacuum pressure of the system over a long distance.

[0041] In one embodiment, an adjustable negative pressure valve 14 is provided on the pipe connecting the pressure tank and the CNC engraving machine. The adjustable negative pressure valve 14 can be a Roots blower adjustable spring type 2-inch negative pressure valve, which can adjust the pressure relief value according to the actual use. It can also form a double protection with the pressure relief solenoid valve YV1. When the electrical system fails to relieve pressure, it can mechanically protect against pressure relief and effectively prevent losses caused by electrical problems.

[0042] In addition, the bottom of the pressure tank is equipped with an automatic drainage pipe S7 to promptly drain the cutting fluid entering from the vacuum end, so as to maintain stable system pressure.

[0043] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance, and can be interpreted as names.

[0044] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A vacuum protection system for a glass cover plate fine carving workshop, for a glass cover plate fine carving workshop, wherein a power distribution cabinet, a CNC fine carving machine table, a pressure storage tank and a cooling tower are connected in sequence in the glass cover plate fine carving workshop, the pressure storage tank and the cooling tower are connected through a circulating pipeline, a water supply circulating pump and a vacuum pump, the CNC fine carving machine table is provided with negative pressure through the pressure storage tank, the cooling tower is connected with a pure water supplement pipeline, and an electromagnetic valve is arranged on the pure water supplement pipeline. The vacuum protection system comprises a float ball switch installed in the cooling tower to monitor the water level, a first negative pressure gauge installed on the storage tank, and an alarm element connected to the power distribution cabinet by an electric signal, wherein the power distribution cabinet is installed with an intermediate relay and a frequency converter for controlling the vacuum pump, the intermediate relay is provided with a plurality of switches, the circulating pipeline comprises a return water pipeline and a water supply pipeline, the return water pipeline is connected to the storage tank through the vacuum pump, the water supply pipeline is connected to the bottom of the cooling tower and the vacuum pump, a water supply circulating pump is arranged on the water supply pipeline, and the float ball switch, the first negative pressure gauge, the power distribution cabinet and the electromagnetic valve are connected by an electric signal.

2. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 1, wherein, A start button is further installed on the power distribution cabinet and connected to the frequency converter by an electric signal to control the forward and reverse rotation of the vacuum pump through the frequency converter.

3. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 1, wherein, The first negative pressure gauge is a mechanical negative pressure gauge.

4. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 3, wherein, A second negative pressure gauge is further installed on the power distribution cabinet and connected to the alarm element by an electric signal through the intermediate relay.

5. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 4, wherein, The alarm element is an alarm horn or a combination of an alarm horn and a flashing light.

6. The vacuum containment system for a glass cover sheet fine carving machine shop of claim 1, wherein, The CNC precision carving machine is further connected to a pressure relief pipeline, the pressure relief pipeline is provided with a pressure relief electromagnetic valve, and the pressure relief electromagnetic valve is connected to the intermediate relay by an electric signal.

7. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 6, wherein, A manual ball valve is further arranged on the pressure relief pipeline, and the manual ball valve is located downstream of the pressure relief electromagnetic valve.

8. The vacuum containment system for a glass cover sheet fine carving machine shop of claim 6, wherein, The CNC precision carving machine is further connected to a pressure stabilizing pipeline, the end of the pressure stabilizing pipeline is provided with a pressure stabilizing tank, and the pressure relief pipeline is connected to the pressure stabilizing pipeline.

9. The vacuum containment system for a glass cover sheet fine carving machine workshop of claim 1 or 6, wherein, An adjustable negative pressure valve is arranged on the pipeline connecting the storage tank and the CNC precision carving machine.

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