Vacuum equipment with automatic alarm function and control system thereof

Abstract

The utility model provides an automatic alarm vacuum device and a control system thereof, the automatic alarm vacuum device comprises a vacuum device connected with a tank body, the vacuum device is electrically connected with a driving motor, the tank body is communicated with an electric contact type pressure gauge, and the electric contact type pressure gauge is also electrically connected with an alarm in an interlocking manner. The interlocking type electrical connection comprises a first control circuit and a second control circuit which are arranged in parallel, and in the first control circuit, an electric contact type pressure gauge, an alarm and a second contactor are arranged in series; and in the second control circuit, a group of normally closed contacts of the second contactor are connected in series with a first contactor, and a group of normally open contacts of the first contactor are electrically connected with a driving motor of the vacuum equipment. According to the utility model, the automatic monitoring and warning functions of the vacuum degree in the plastic production extrusion equipment are realized, so that the quality problem caused by the blockage of plastic particles is reduced. In addition, aiming at the vacuum pump body, structures such as a valve and a universal wheel are further improved, so that the vacuum pump is convenient to overhaul and maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump technical field, concretely relates to a kind of automatic alarm's vacuum equipment and its control system. BACKGROUND

[0002] In the process of plastic extrusion granulation, tank is connected with vacuum pump through pipeline to carry out vacuumizing, which is a common process step, and the main purpose is to improve the quality and performance of product. Plastic raw materials may entrain air, adsorbed moisture, residual monomer, low-boiling plasticizer and volatile oligomers at molding temperature during extrusion. If these components are not excluded, they will form pores, bubbles and mottling on the surface and inside of the product, affecting the appearance of the product, especially the appearance of the line produced during extrusion drawing, and the quality of the product. The utility model patent with publication number CN202174730U discloses a vacuumizing device of plastic extruder, reflecting the connection relationship between plastic granulator and vacuumizing device.

[0003] Most of the conventional vacuum pumps use mechanical vacuum degree display devices. When the vacuum pipeline or vacuum port is blocked, it is difficult to timely and effectively notify the operator, which often leads to insufficient vacuum degree, affecting production efficiency and product quality, and causing unnecessary cost. The main solutions include regular inspection and reliance on manual monitoring of vacuum gauge changes. Although these methods can prevent faults to some extent, they are low in efficiency and accuracy. In addition, traditional mechanical vacuum gauges have low precision and are easily affected by environmental factors, making it difficult to meet the requirements of accurate control in modern industrial production. UTILITY MODEL CONTENT

[0004] The utility model aims to overcome the shortcomings of the prior art, improve the vacuum pump and its control system, effectively monitor the working state of the vacuum system, and immediately issue an alarm in abnormal conditions, so that the operator can respond quickly.

[0005] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows:

[0006] An automatic alarm vacuum equipment and its control system, comprising a vacuum equipment connected with a tank, the tank is communicated with a vacuum pipeline, the vacuum equipment is electrically connected with a driving motor, an electric contact pressure gauge is communicated with the tank and is electrically connected with an alarm, when the actual vacuum degree value is higher or lower than the set range, the alarm reminds the operator.

[0007] Further, the electric contact pressure gauge and the alarm are interlocked electrically connected.

[0008] Interlocked electrical connection includes a first control circuit and a second control circuit arranged in parallel, wherein:

[0009] In the first control circuit: the electric contact pressure gauge, the alarm, and the second contactor are connected in series.

[0010] In the second control circuit: a group of normally closed contacts of the second contactor are connected in series with the first contactor, and a group of normally open contacts of the first contactor are electrically connected with a driving motor of the vacuum equipment.

[0011] Further, the second control circuit further has a thermal relay connected in series.

[0012] Further, the second control circuit further has an emergency stop switch connected in series.

[0013] Further, the alarm in the first control circuit comprises a warning light and / or a buzzer.

[0014] To facilitate maintenance and ensure the sealing effect of the tank, the utility model provides a technical scheme further comprising that a valve is arranged at one end of the tank through a hinge, a rotating seat is fixedly arranged on the outer wall of the tank, a threaded rod is rotatably connected to the rotating seat, the threaded rod is connected to a rotary valve, a clamping seat adapted to the threaded rod and the rotary valve is arranged on the outer periphery of the valve, and when the threaded rod is rotated into the clamping seat, the rotary valve is tightened, and the pressure between the rotary valve and the rotating seat locks the valve.

[0015] To enable the vacuum pump to move flexibly, the utility model provides a technical scheme further comprising that a bottom plate is further arranged below the vacuum pump and the motor, and a plurality of universal wheels are fixedly arranged below the bottom plate.

[0016] To facilitate quick reflection of the blockage site, the utility model provides a technical scheme further comprising that the tank is connected to the extrusion equipment through a pipeline, and a vacuum gauge is further arranged on the pipeline, and the blockage site is determined by judging the difference between the readings of the electric contact pressure gauge and the vacuum gauge and the alarm condition.

[0017] The utility model has the advantages and beneficial effects that:

[0018] 1. The mechanical vacuum gauge is replaced by the electric contact pressure gauge, and the electric contact pressure gauge is electrically connected with the alarm in interlocking mode, so that the vacuum gauge can quickly issue an alarm when detecting that the vacuum degree of the extrusion equipment is reduced due to blockage, and the operator is reminded.

[0019] 2. The thermal relay is arranged in the vacuum equipment circuit to realize automatic overload protection and maintain the safety of the equipment.

[0020] 3. The hinge-connected valve and the threaded rod rotary valve are arranged on the tank of the vacuum equipment, which provides convenience for maintenance under the condition of ensuring the sealing state. DRAWINGS

[0021] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0022] Figure 2 is the local enlarged structure schematic view of the embodiment A of the utility model;

[0023] Figure 3 is the interlocking circuit block diagram of the utility model embodiment;

[0024] Figure 4 is the connection structure schematic view of the extrusion equipment and vacuum pump of the utility model embodiment;

[0025] In the figure:

[0026] 1-tank body, 2-driving motor, 3-electric contact pressure gauge, 4-alarm, 5-hinge, 6-valve, 7-rotary seat, 8-threaded rod, 9-rotary valve, 10-clamping seat, 11-bottom plate, 12-universal wheel, 13-emergency stop indicator light, 14-vacuum gauge,

[0027] Among them, the electric element mark includes:

[0028] KM1-first contactor, KM2-second contactor, SB1-starting switch, SB2-emergency stop switch, FR-thermal relay. DETAILED DESCRIPTION

[0029] Electric contact pressure gauge is a kind of various gas and liquid medium to be measured (controlled) pressure realizes automatic control by instrument The instrument device, built-in measurement system, spring tube in measurement system is forced to produce corresponding elastic deformation-displacement at the end of spring tube under the pressure of measured medium, by means of pull rod transmission and amplification by gear transmission mechanism, the measured value is indicated on the scale by the fixed gear on the indicating (together with the contact) The moment when it is in contact with the contact (upper limit or lower limit) on the setting pointer (moving break or moving combination), the circuit in the control system can be disconnected or connected.

[0030] Contactor is a kind of electric element, divided into ac contactor and dc contactor, it is applied to electric power, power distribution and power consumption. Contactor is generally referred to as the industry that uses coil current to produce magnetic field, makes contactor close or open, to achieve the control of load electric appliance.

[0031] The working principle of thermal relay is that the heat generated by the current flowing into the thermal element makes the bimetallic strip with different expansion coefficients deform, when the deformation reaches a certain distance, the connecting rod is driven to act, the control circuit is disconnected, so that the contactor loses power, the main circuit is disconnected, the overload protection of motor is realized.

[0032] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the present application, and cannot be used to limit the protection scope of the present application.

[0033] Embodiment

[0034] Please refer to Figures 1-3 A kind of automatic alarm vacuum equipment and control system thereof, including the vacuum equipment containing jar body 1, jar body 1 is connected with vacuum pipeline, the vacuum equipment is electrically connected with driving motor 2, driving motor 2 drives vacuum equipment to form negative pressure and realizes vacuumizing, jar body 1 is connected with electric contact type pressure gauge 3, electric contact type pressure gauge 3 is electrically connected with a alarm 4, when actual vacuum degree value is higher than or lower than set range, alarm 4 alarms and reminds operator, electric contact type pressure gauge 3 and alarm 4 are interlocked electrically connected.Through the above technical scheme, the vacuum degree in the alarm can quickly and rapidly respond to the situation of equipment, so that operator responds quickly, avoid the problem that product line appears air hole and needs rework caused by insufficient vacuum degree.

[0035] Interlocked electrically connected includes the first control circuit and the second control circuit of parallelly arranged, in the first control circuit: electric contact type pressure gauge 3, alarm 4, second contactor KM2 are connected in series;In the second control circuit: the first contactor KM1 that a group of normally closed contact of second contactor KM2 is connected in series is set, the normally open contact of first contactor KM1 is electrically connected with the driving motor of vacuum equipment.A thermal relay FR and an emergency stop switch SB2 are also connected in series in the second control circuit.A group of normally open contact of first contactor KM1 is equipped with start switch SB1.Emergency stop switch is also provided with emergency stop indicator 13, and it is well known in the art that emergency stop indicator 13 has a separate power supply circuit, and when the normally closed emergency stop switch SB2 is opened, the emergency stop indicator lights up, indicating the state of the equipment.

[0036] Jar body 1 is provided with valve 6 at one end through hinge 5, rotating seat 7 is fixedly installed on the outer wall of jar body 1, screw rod 8 is rotatably connected with rotating seat 7, and rotating valve 9 is rotatably connected with screw rod 8 through screw thread, clamping seat 10 adapted to screw rod 8 and rotating valve 9 is arranged on the outer periphery of valve 6, when screw rod 8 is rotated into clamping seat 10 with rotating seat 7, rotating valve 9 is tightened, and valve 6 is locked between rotating valve 9 and rotating seat 7 by pressure.A bottom plate 11 is also arranged below the vacuum equipment and driving motor 2, and a plurality of universal wheels 12 are fixedly installed below the bottom plate 11.Through the above technical scheme, the vacuum equipment is easy to move and open the valve to check the blockage of internal pipeline and vacuum port.

[0037] Please refer to Figure 4, the tank 1 is connected to the extrusion equipment through flange and pipeline, and a vacuum gauge 14 can be arranged on the pipeline, and the difference between the indication of the vacuum gauge 14 and the electric contact pressure gauge 3 can be used to determine the position where the blockage occurs. Specifically, in the normal working state, the electric contact pressure gauge 3 displays that the internal pressure is equal to or slightly lower than the vacuum gauge 14, in this case, when the alarm is triggered, the tank 1 should be checked for blockage, and when the electric contact pressure gauge 3 displays that the pressure is higher than the positive air table 14, it indicates that the pipeline is blocked, and the operator needs to repair the pipeline.

[0038] Working principle:

[0039] First, press the start button SB1, the first contactor KM1 in the second control circuit is powered on, a group of normally open contacts of the first contactor KM1 is closed, the motor 2 is driven to work, and the vacuum equipment starts to vacuum; in the first control circuit, the electric contact pressure gauge 3 detects the pressure (i.e. the converted vacuum degree) in the tank 1, if the pressure in the tank 1 exceeds or is lower than the working range, the internal contacts of the electric contact pressure gauge 3 are connected, a path is formed, the alarm 4 and the second contactor 2 are powered on, a group of normally closed contacts of the second contactor KM2 is disconnected, so that the second control circuit is disconnected, and the driving motor is stopped; at the same time, the alarm gives an alarm. When the driving motor is overloaded, the thermal relay FR triggers the overload protection, cuts off the second control circuit, and stops the driving motor.

[0040] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, some improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. An automatic alarm vacuum device and a control system thereof, comprising a vacuum device connected with a tank, the vacuum device being electrically connected with a driving motor, characterized in that, An electric contact pressure gauge is arranged in communication with the tank body, and the electric contact pressure gauge is electrically connected with the alarm; The electric contact pressure gauge is electrically connected with the alarm in interlocking mode; The electric connection in interlocking mode includes a first control circuit and a second control circuit arranged in parallel, wherein: In the first control circuit: the electric contact pressure gauge, the alarm, and a second contactor are arranged in series; In the second control circuit: a group of normally closed contacts of the second contactor are arranged in series with a first contactor, and a group of normally open contacts of the first contactor are electrically connected with a driving motor of the vacuum equipment.

2. The self alarming vacuum apparatus and control system thereof according to claim 1, wherein, A thermal relay is further arranged in series in the second control circuit.

3. The self alarming vacuum apparatus and control system thereof according to claim 1, wherein, An emergency stop switch is further arranged in series in the second control circuit.

4. The self-alarming vacuum apparatus and control system thereof according to any one of claims 1 to 3, wherein, The alarm includes an emergency stop indicator light and / or a buzzer.

5. The self alarming vacuum apparatus and control system thereof according to claim 1, wherein, One end of the tank body is provided with a valve through a hinge, a rotating seat is fixedly arranged on the outer wall of the tank body, a threaded rod is rotationally connected to the rotating seat, a rotary valve is connected to the threaded rod, and a clamping seat adapted to the threaded rod and the rotary valve is arranged on the outer periphery of the valve.

6. The self alarming vacuum apparatus and control system thereof according to claim 1, wherein, A bottom plate is further arranged below the vacuum equipment and the driving motor, and a plurality of universal wheels are fixedly arranged below the bottom plate.

7. The self alarming vacuum apparatus and control system thereof according to claim 1, wherein, The vacuum equipment is connected to an extrusion device through a pipeline, and a vacuum gauge is further arranged in communication with the pipeline.

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