Curing agent conveying system

Abstract

The utility model provides a curing agent conveying system, which relates to the technical field of conveying equipment and comprises a curing agent storage device, a conveying device and a mixing device. A liquid inlet of the back pressure valve is communicated with a liquid outlet of the conveying pump; a liquid inlet of the switch valve is communicated with a liquid outlet of the back pressure valve, and a liquid outlet of the switch valve is communicated with the material mixing device; a liquid inlet of the pressure release valve is communicated between a liquid outlet of the delivery pump and a liquid inlet of the back pressure valve; a liquid outlet of the pressure release valve is communicated between a liquid outlet of the curing agent storage device and a liquid inlet of the conveying pump, curing agent fluid in a pipeline can be conveyed at stable pressure through the dual functions of pressure maintaining of the back pressure valve and pressure release of the pressure release valve, the conveying system has the high response speed, and the conveying efficiency is improved. Input of curing agent fluid into the mixing device can be quickly started and stopped, and the conveying amount of the curing agent fluid can be more accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of conveying equipment, and particularly relates to a curing agent conveying system. Background Art

[0002] In the process of preparing simulated marble, a curing agent is usually used as a gelling material. With the gradual improvement of production environment requirements, the curing agent is generally conveyed to a mixing device by a closed conveying device. In the mixing device, the curing agent participates in the reaction. This conveying device usually uses the mutual cooperation of a pump body and a conveying pipeline to achieve the purpose of conveying the curing agent. The conveying amount of the curing agent is controlled by controlling the operation time of the pump. However, when the pump starts and stops, there is a large difference between the flow rate output by the conveying device and the flow rate output during normal operation. When the pump is started, the curing agent cannot be output in time. When the pump stops, the flow cannot be cut off in time. The accuracy of the conveying amount of the curing agent is relatively low, and the phenomena of air bubbles or flow interruption are likely to occur. In the prior art, a peristaltic pump is often used to convey the curing agent, and the dosing amount is controlled according to the rotation speed and time of the pump. However, the peristaltic pump conveys by alternately squeezing and releasing a hose with rollers, which will generate a large pulse during operation, the flow rate conveying is not stable enough, and when there are air bubbles or flow interruption phenomena, manual observation is required and it cannot be judged in time, resulting in uneven dosing of the curing agent and inaccurate flow rate, thus affecting the quality of the marble finished product. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a curing agent conveying system to solve the problems existing in the above-mentioned prior art. Through the dual functions of pressure maintaining by a back pressure valve and pressure relief by a pressure relief valve, the curing agent fluid in the pipeline can be conveyed at a stable pressure. The conveying system has a fast response speed, can quickly open and block the input of the curing agent fluid into the mixing device, and can more accurately control the conveying amount of the curing agent fluid.

[0004] To achieve the above purpose, the utility model provides the following solution: Provide a curing agent conveying system, including a curing agent storage device, a conveying device, and a mixing device. The conveying device includes:

[0005] A conveying pump, the inlet of which is communicated with the curing agent storage device;

[0006] A back pressure valve, the inlet of which is communicated with the outlet of the conveying pump;

[0007] A switching valve, the inlet of which is communicated with the outlet of the back pressure valve, and the outlet of which is communicated with the mixing device;

[0008] A pressure relief valve, the inlet of the pressure relief valve is connected between the outlet of the delivery pump and the inlet of the back pressure valve; the outlet of the pressure relief valve is connected between the outlet of the curing agent storage device and the inlet of the delivery pump.

[0009] Preferably, a flow meter is connected between the delivery pump and the back pressure valve, the outlet of the delivery pump is connected to the inlet of the flow meter, and the outlet of the flow meter is connected to the inlet of the back pressure valve.

[0010] Preferably, a pressure detection device is connected between the outlet of the delivery pump and the inlet of the flow meter.

[0011] Preferably, the pressure detection device includes a pressure transmitter, and the pressure transmitter is connected between the outlet of the delivery pump and the inlet of the flow meter through a pressure transmitter root valve.

[0012] Preferably, the inlet of the pressure relief valve is connected between the pressure transmitter root valve and the flow meter.

[0013] Preferably, the conveying device includes a controller and an AC servo device that are electrically connected, the AC servo device is electrically connected to the delivery pump, and the controller is electrically connected to the flow meter, the pressure transmitter, and the switching valve.

[0014] Preferably, the conveying device further includes a human-machine interface, and the human-machine interface is electrically connected to the controller.

[0015] Preferably, a Y-type filter for filtering solid particles is provided between the outlet of the curing agent storage device and the inlet of the delivery pump.

[0016] Preferably, a manual switching valve is connected between the outlet of the curing agent storage device and the inlet of the Y-type filter.

[0017] Preferably, the delivery pump is a gear pump.

[0018] The present utility model has achieved the following technical effects compared with the prior art:

[0019] The curing agent is transported to the back pressure valve through a pipeline by a transfer pump. When the pressure in the pipeline is greater than the opening pressure value of the back pressure valve, the back pressure valve opens, and the curing agent fluid passes through the back pressure valve and flows to the switching valve, stabilizing the pressure of the curing agent fluid in the pipeline. The switching valve opens, and the curing agent fluid with stable pressure quickly reaches the mixing device. When the delivery volume of the curing agent fluid reaches the preset value, the transfer pump shuts off, and the pressure of the curing agent fluid in the pipeline decreases. When the pressure is lower than the opening pressure value of the back pressure valve, the back pressure valve quickly closes, and at the same time, the switching valve is controlled to close, blocking the delivery of the curing agent. When the pressure of the curing agent fluid in the delivery pipeline is greater than the preset delivery pressure value, the curing agent fluid opens the pressure relief valve, and the curing agent fluid flows into the pipeline between the curing agent storage device and the transfer pump. At the same time, the volume of the curing agent fluid output from the curing agent storage device will decrease, realizing pressure relief for the pipeline on the rear side of the delivery direction of the transfer pump. Under the dual actions of the pressure maintaining of the back pressure valve and the pressure relief of the pressure relief valve, the curing agent fluid in the pipeline can be transported at a stable pressure in the present utility model, ensuring the stability and accuracy of the delivery of the curing agent fluid. At the same time, before the switching valve opens, the pressure of the curing agent fluid in the pipeline is at the preset delivery pressure value. When the switching valve opens, the curing agent fluid can quickly flow into the mixing device; when the transfer pump shuts off, the pressure of the curing agent fluid in the pipeline decreases, then the back pressure valve and the switching valve quickly close, immediately cutting off the input of the curing agent fluid into the mixing device. The delivery system of the present utility model has a relatively fast response speed, can quickly open and block the input of the curing agent fluid into the mixing device, and can more accurately control the delivery volume of the curing agent fluid. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the curing agent delivery system of the present utility model.

[0022] Among them, 1. Transfer pump; 2. Back pressure valve; 3. Switching valve; 4. Pressure relief valve; 5. Flowmeter; 6. Pressure transmitter; 7. Root valve of the pressure transmitter; 8. Controller; 9. AC servo device; 10. Human-machine interface; 11. Y-type filter; 12. Manual switching valve; 13. Delivery pipeline system; 14. Electric control system. Detailed Embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please refer to Figure 1 As shown, in this embodiment, a curing agent delivery system is provided, including a curing agent storage device, a delivery device, and a mixing device. The inlet end of the delivery device is communicated with the curing agent storage device. The curing agent storage device is preferably a curing agent raw material tank, and the curing agent raw material tank is a sealed device. The outlet end of the delivery device is communicated with the mixing device. The mixing device is preferably a mixing tank, and the mixing tank can also be a sealed structure. The delivery device includes a delivery pump 1, a back pressure valve 2, a switching valve 3, and a pressure relief valve 4. The inlet of the delivery pump 1 is communicated with the curing agent storage device. The inlet of the back pressure valve 2 is communicated with the outlet of the delivery pump 1. The inlet of the switching valve 3 is communicated with the outlet of the back pressure valve 2, and the outlet of the switching valve 3 is communicated with the mixing device. The inlet of the pressure relief valve 4 is communicated between the delivery pump 1 and the back pressure valve 2, and the outlet of the pressure relief valve 4 is communicated between the curing agent storage device and the delivery pump 1. All components are connected through pipelines with good sealing performance.

[0026] Working principle: An internal spring is provided in the back pressure valve 2. When the pressure in the delivery pipeline is small, the diaphragm blocks the pipeline under the elastic force of the spring. When the pressure of the curing agent fluid in the pipeline is greater than the opening pressure value of the back pressure valve 2 body, the curing agent fluid pushes the diaphragm to compress the spring, and at this time the back pressure valve 2 is in an open state. The opening pressure value in the back pressure valve 2 is preset, and at the same time, the delivery pressure value in the delivery pipeline is set so that the curing agent fluid can be transported in the pipeline according to the delivery pressure value. The value of the delivery pressure value is greater than the value of the opening pressure value of the back pressure valve 2.

[0027] During operation, the curing agent in the curing agent storage device is transported through a pipeline to the back pressure valve 2 by the transfer pump 1. The liquid pressure in the pipeline continuously increases. When the pressure in the pipeline is greater than the opening pressure value of the back pressure valve 2, the back pressure valve 2 is in an open state. The curing agent fluid passes through the back pressure valve 2 and flows in the pipeline to the on-off valve 3 until the pressure of the curing agent fluid in the pipeline is stable. Then, the on-off valve 3 is controlled to open, and the curing agent fluid quickly passes through the on-off valve 3 and is introduced into the mixing device to participate in the preparation of artificial marble. When the delivery volume of the curing agent fluid reaches the preset value, the transfer pump 1 is controlled to close. At this time, the pressure of the curing agent fluid in the pipeline decreases. When the pressure is lower than the opening pressure value of the back pressure valve 2, the back pressure valve 2 quickly closes to block the delivery of the curing agent. At the same time, the on-off valve 3 is controlled to close to further block the delivery of the curing agent.

[0028] Meanwhile, when the pressure of the curing agent fluid in the delivery pipeline is greater than the preset delivery pressure value, the pressure relief valve 4 is opened by the curing agent fluid with a relatively high pressure in the pipeline between the transfer pump 1 and the back pressure valve 2. The curing agent fluid is introduced into the pipeline between the curing agent storage device and the transfer pump 1, thereby realizing pressure relief for the pipeline on the rear side of the delivery direction of the transfer pump 1. At this time, the amount of the curing agent fluid output from the curing agent storage device will decrease. The curing agent fluid output from the curing agent storage device is mixed with the curing agent fluid output from the pressure relief valve 4 and then jointly re-introduced into the transfer pump 1 to ensure the stable supply of the curing agent fluid.

[0029] Under the dual actions of the pressure maintaining of the back pressure valve 2 and the pressure relief of the pressure relief valve 4 in the present utility model, the curing agent fluid in the pipeline can be transported at a stable pressure. The transportation process of the curing agent fluid is stable, avoiding the situation of interrupted flow, and there will be no bubbles in the curing agent fluid, ensuring the stability and accuracy of the transportation of the curing agent fluid. At the same time, before the on-off valve 3 is opened, the curing agent fluid has passed through the back pressure valve 2 and reached the on-off valve 3. The pressure of the curing agent fluid in the pipeline is at the preset delivery pressure value. When the on-off valve 3 is opened, the curing agent fluid can quickly be introduced into the mixing device. When the transfer pump 1 is closed, the pressure of the curing agent fluid in the pipeline decreases, then the back pressure valve 2 and the on-off valve 3 quickly close, immediately cutting off the input of the curing agent fluid into the mixing device. The delivery system of the present utility model has a relatively fast response speed, can quickly open and block the input of the curing agent fluid into the mixing device, and can more accurately control the delivery volume of the curing agent fluid.

[0030] In one embodiment, the transfer pump 1 is preferably a gear pump, and the transportation process of the curing agent is more stable.

[0031] In one embodiment, a flowmeter 5 is connected between the delivery pump 1 and the back pressure valve 2. The liquid outlet of the delivery pump 1 is connected to the liquid inlet of the flowmeter 5, and the liquid outlet of the flowmeter 5 is connected to the liquid inlet of the back pressure valve 2. The flowmeter 5 is preferably a mass flowmeter, which includes a flow detection module, a temperature detection module, and a density detection module. The instantaneous flow information, temperature information, and density information of the curing agent fluid can be calculated through the mass flowmeter, and the flow rate, temperature, and mixed density of the curing agent fluid can be measured through the mass flowmeter. Preferably, the accuracy of the flowmeter 5 is at least two-thousandths, and the flowmeter 5 is a Coriolis flowmeter.

[0032] In this embodiment, a pressure detection device is further included, which is connected between the liquid outlet of the delivery pump 1 and the liquid inlet of the flowmeter 5. The pressure in the delivery pipeline can be detected through the pressure detection device.

[0033] In this embodiment, the pressure detection device includes a pressure transmitter 6 and a pressure transmitter root valve 7. The pressure transmitter 6 is connected to the pressure transmitter root valve 7, and the inlet end of the pressure transmitter root valve 7 is connected between the liquid outlet of the delivery pump 1 and the liquid inlet of the flowmeter 5. The limit pressure value in the pipeline is preset in advance, and the pressure in the delivery pipeline is detected through the pressure transmitter 6 and the pressure transmitter root valve 7. When the real-time pressure value in the pipeline approaches or is greater than the limit pressure value, the delivery pump 1 is immediately shut down to stop delivering the curing agent into the pipeline, preventing the pressure in the pipeline from further increasing. This limit pressure value serves as a safety guarantee, and the value of the limit pressure value is greater than the value of the preset delivery pressure value in the pipeline.

[0034] In this embodiment, the liquid inlet of the pressure relief valve 4 is connected between the pressure transmitter root valve 7 and the liquid inlet of the flowmeter 5. The pressure relief valve 4 can play a role in stabilizing the pressure in the delivery pipeline, ensuring the stability of the pressure of the curing agent fluid passing through the flowmeter 5. There is a spring structure inside the pressure relief valve 4. When the pressure in the pipeline behind the delivery pump 1 is small, the pressure relief valve 4 is in a closed state. When the pressure in the pipeline reaches the delivery pressure value, the pressure relief valve 4 opens and the opening degree increases as the pipeline pressure increases, allowing more curing agent to flow back to the front end of the delivery pump 1 through the pressure relief valve 4, thereby reducing the pressure in the pipeline behind the delivery pump 1. The pre-tightening force of the valve can be adjusted by rotating the handle of the pressure relief valve 4, thereby adjusting the delivery pressure value and limiting the pressure behind the delivery pump 1 below the preset delivery pressure value.

[0035] In this embodiment, it includes a controller 8 and an AC servo device 9. The controller 8 is electrically connected to the AC servo device 9, and the AC servo device 9 is electrically connected to the delivery pump 1. Specifically, the output end of the AC servo device 9 is electrically connected to the input end of the delivery pump 1. The controller 8 is also electrically connected to a flowmeter 5, a pressure transmitter 6, and a switching valve 3. Specifically, the output end of the controller 8 is connected to the input end of the switching valve 3, and the controller 8 sends an opening and closing command to the switching valve 3, and the switching valve 3 performs an opening and closing action according to the command. The AC servo device 9 can control the delivery pump 1 to operate at a certain rotational speed according to the parameters provided by the controller 8, and can control the on-off time of the delivery pump 1. The controller 8 can receive the flow information transmitted by the flowmeter 5, and the controller 8 can monitor whether there is a no-flow situation according to the instantaneous flow information provided by the flowmeter 5, and alarm and control the system to stop when the no-flow reaches a certain time. At the same time, during the feeding process, the controller 8 monitors whether the temperature of the curing agent is within the set range according to the temperature information provided by the flowmeter 5. If it exceeds the set range, an alarm is given and the system is controlled to stop. During the feeding process, the controller 8 monitors whether the density fluctuation of the curing agent is within the normal range according to the density information provided by the flowmeter 5. If the density fluctuation exceeds the set range, an alarm is given.

[0036] In this embodiment, it further includes a human-machine interface 10. The human-machine interface 10 is electrically connected to the controller 8. A Y-type filter 11 is provided between the liquid outlet of the curing agent storage device and the liquid inlet of the delivery pump 1. Solid particles are filtered through the Y-type filter 11. The substances that can be filtered include, but are not limited to, iron filings, plastic residues, stone powder, or solid impurities inherent in the curing agent brought in during storage and transportation. The Y-type filter 11 can protect the equipment in the system such as the delivery pump 1, the flowmeter 5, the back pressure valve 2, and the pressure relief valve 4, preventing equipment damage. A manual switching valve 12 is connected between the liquid outlet of the curing agent storage device and the liquid inlet of the Y-type filter 11, and the opening and closing of the system can be manually controlled through the manual switching valve 12. The switching valve 3 is an outlet pneumatic valve.

[0037] Working principle: The flow rate of the curing agent and the total feeding amount of the curing agent are pre-entered in the human-machine interface 10 of the electric control system 14. Click the start button, and the controller 8 automatically calculates the appropriate starting rotational speed control parameters of the delivery pump 1 and outputs them to the AC servo device 9. The AC servo device 9 controls the delivery pump 1 to start at a certain rotational speed according to the parameters provided by the controller 8, and the curing agent enters the delivery pipeline system 13.

[0038] After the transfer pump 1 is started, the curing agent first enters the Y-type filter 11 from the manual switch valve 12 for filtration. The filtered curing agent enters the transfer pump 1 for pressurized transportation. When the pipeline pressure after the transfer pump 1 exceeds the preset transportation pressure value, the curing agent passing through the transfer pump 1 flows back through the pressure relief valve 4 to between the outlet of the Y-type filter 11 and the inlet of the transfer pump 1, reducing the input amount of the curing agent in the curing agent storage device, thereby limiting the pressure within a certain range.

[0039] Meanwhile, the curing agent passing through the transfer pump 1 reaches the detection point of the pressure transmitter 6 via the pressure transmitter root valve 7. The pressure transmitter 6 outputs the pipeline pressure information after the transfer pump 1 to the controller 8, and the controller 8 determines whether the pipeline pressure after the transfer pump 1 exceeds the limit pressure value. If it does not exceed, the system operates normally; if it exceeds, an alarm is given and a shutdown signal is output to the AC servo device 9, and the AC servo device 9 controls the transfer pump 1 to stop running.

[0040] After the rotation speed of the transfer pump 1 stabilizes, click the feeding button on the man-machine interface 10. After receiving the information, the controller 8 controls the opening of the switch valve 3. The curing agent passing through the transfer pump 1 enters the flowmeter 5. The flowmeter 5 outputs the instantaneous flow rate information, temperature information, and density information of the curing agent to the controller 8. The curing agent passing through the flowmeter 5 passes through the back pressure valve 2 to ensure that there is a certain pressure in the pipeline of the curing agent, thereby reducing the flow rate fluctuation. The curing agent passing through the back pressure valve 2 enters the mixing device through the switch valve 3.

[0041] During the feeding process, the controller 8 automatically calculates the appropriate pump operating speed control parameters based on the instantaneous flow rate information provided by the flowmeter 5 and outputs them to the AC servo device 9. The AC servo device 9 controls the transfer pump 1 to operate at the required speed according to the parameters provided by the controller 8, thereby ensuring the stability of the flow rate.

[0042] During the feeding process, the controller 8 automatically calculates the cumulative flow rate. When the cumulative flow rate reaches the total feeding amount input in the man-machine interface 10, it controls the switch valve 3 to close and the transfer pump 1 to stop running. In the present utility model, it can automatically calculate the starting speed of the transfer pump 1 for transportation according to the flow rate and total feeding amount input by the user, and adjust the speed of the transfer pump 1 in real time during transportation to ensure that the flow rate is stable near the input flow rate value, and automatically stop after reaching the total feeding amount. Moreover, the transportation system of the present utility model has a fast response speed, can quickly open and block the input of the curing agent fluid into the mixing device, and can more accurately control the transportation amount of the curing agent fluid.

[0043] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0044] Specific examples are used in the present utility model to elaborate on the principles and implementation manners of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A curing agent conveying system, comprising a curing agent storage device, a conveying device, and a mixing device, characterized in that, The conveying device includes: A conveying pump (1), the inlet of the conveying pump (1) is communicated with the curing agent storage device; A back pressure valve (2), the inlet of the back pressure valve (2) is communicated with the outlet of the conveying pump (1); A switching valve (3), the inlet of the switching valve (3) is communicated with the outlet of the back pressure valve (2), and the outlet of the switching valve (3) is communicated with the mixing device; A pressure relief valve (4), the inlet of the pressure relief valve (4) is communicated between the outlet of the conveying pump (1) and the inlet of the back pressure valve (2); the outlet of the pressure relief valve (4) is communicated between the outlet of the curing agent storage device and the inlet of the conveying pump (1).

2. The curing agent delivery system according to claim 1, wherein A flow meter (5) is communicated between the conveying pump (1) and the back pressure valve (2), the outlet of the conveying pump (1) is communicated with the inlet of the flow meter (5), and the outlet of the flow meter (5) is communicated with the inlet of the back pressure valve (2).

3. The curing agent delivery system according to claim 2, wherein, A pressure detection device is communicated between the outlet of the conveying pump (1) and the inlet of the flow meter (5).

4. The curing agent delivery system according to claim 3, wherein The pressure detection device includes a pressure transmitter (6), and the pressure transmitter (6) is communicated between the outlet of the conveying pump (1) and the inlet of the flow meter (5) through a pressure transmitter root valve (7).

5. The curing agent delivery system according to claim 4, wherein The inlet of the pressure relief valve (4) is communicated between the pressure transmitter root valve (7) and the flow meter (5).

6. The curing agent delivery system according to claim 5, wherein, The conveying device includes a controller (8) and an AC servo device (9) which are electrically connected. The AC servo device (9) is electrically connected with the conveying pump (1), and the controller (8) is electrically connected with the flow meter (5), the pressure transmitter (6) and the switching valve (3).

7. The curing agent delivery system according to claim 6, characterized in that, The conveying device further includes a human-machine interface (10), and the human-machine interface (10) is electrically connected with the controller (8).

8. The curing agent delivery system according to claim 1, wherein A Y-type filter (11) for filtering solid particles is arranged between the outlet of the curing agent storage device and the inlet of the conveying pump (1).

9. The curing agent delivery system according to claim 8, wherein, A manual switching valve (12) is communicated between the outlet of the curing agent storage device and the inlet of the Y-type filter (11).

10. The curing agent delivery system according to claim 1, wherein, The conveying pump (1) is a gear pump.

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