Paraffin conveying system

Abstract

The utility model belongs to the technical field of density board production equipment, and discloses a paraffin conveying system which comprises a paraffin tank, a first three-way valve, a first branch pipeline, a second branch pipeline, a connecting pipe, a second three-way valve, a circulating pipeline, a discharging pipeline and a spiral conveyor, and the paraffin tank is provided with a paraffin outlet and a paraffin backflow inlet; the first three-way valve is provided with a feeding inlet end, a first outlet end and a second outlet end, and the feeding inlet end is communicated with a paraffin outlet of the paraffin tank; one end of the first branch pipeline is communicated with a first outlet end of the first three-way valve; one end of the second branch pipeline is communicated with a second outlet end of the first three-way valve; one end of the connecting pipe is communicated with the other end of the first branch pipeline, a communicating port is formed in the side wall of the connecting pipe, and the communicating port is communicated with the other end of the second branch pipeline; according to the paraffin conveying device, paraffin can be stably and continuously conveyed, production continuity is ensured, and impurities in the conveying process are removed.

Description

Technical Field

[0001] This utility model relates to a paraffin wax conveying system, belonging to the technical field of MDF production equipment. Background Technology

[0002] In the production of medium- and high-density fiberboard (MDF), waterproofing is a crucial step in ensuring the performance of the boards, and paraffin wax is typically used as a waterproofing agent. Paraffin wax possesses excellent water repellency and process adaptability, allowing it to be thoroughly mixed with high-temperature fibers. In existing processes, molten paraffin wax is transported to a discharge screw via a delivery pump, metering device, and piping system, ultimately mixing with the fibers in a thermal mill. However, this process places high demands on the continuity of paraffin wax delivery, temperature stability, and filtration efficiency.

[0003] After searching the existing technology, Chinese patent CN204981775U was found to provide a chlorinated paraffin transportation and cooling pipeline system. This system achieves temperature regulation through a main transportation pipeline and a graphite cooler, and is suitable for the storage and transportation of chlorinated paraffin. However, this solution is mainly for chlorinated paraffin with higher chemical stability, and its cooling and transportation mechanism cannot be directly applied to the needs of paraffin transportation. Ordinary paraffin is prone to viscosity changes and impurity blockage during high-temperature transportation. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a paraffin conveying system that can achieve stable and continuous conveying of paraffin, ensure production continuity, and remove impurities during the conveying process.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A paraffin delivery system, comprising:

[0007] A paraffin wax container, wherein the paraffin wax container is provided with a paraffin wax outlet and a paraffin wax reflux inlet;

[0008] The first three-way valve has a feed inlet end, a first outlet end and a second outlet end, and the feed inlet end is connected to the paraffin outlet of the paraffin tank;

[0009] The first branch pipeline, one end of which is connected to the first outlet end of the first three-way valve;

[0010] The second branch pipeline, one end of which is connected to the second outlet end of the first three-way valve;

[0011] A connecting pipe, one end of which is connected to the other end of the first branch pipe, and a connecting port is provided on the side wall of the connecting pipe, which is connected to the other end of the second branch pipe;

[0012] The second three-way valve has a feed inlet, a first outlet end and a second outlet end, and the feed inlet is connected to the other end of the connecting pipe;

[0013] A circulation pipeline, one end of which is connected to the first outlet end of the second three-way valve, and the other end of which is connected to the paraffin reflux inlet of the paraffin tank;

[0014] A discharge pipe, one end of which is connected to the second outlet end of the second three-way valve;

[0015] A screw conveyor, wherein the inlet of the screw conveyor is connected to the other end of the outlet pipe.

[0016] Furthermore, the first branch pipeline is provided with the following sequentially along the transmission direction:

[0017] A first jacketed filter, wherein the first jacketed filter is provided with a filter inlet and a filter outlet.

[0018] The filter inlet is connected to the first outlet end of the first three-way valve;

[0019] A paraffin wax delivery pump, wherein the paraffin wax delivery pump is provided with a pump inlet and a pump outlet, and the pump inlet is connected to the filter outlet of the first jacketed filter;

[0020] A first valve assembly is disposed between the pump outlet of the paraffin delivery pump and one end of the connecting pipe, and the first valve assembly is adapted to control the flow state of paraffin in the first branch pipeline.

[0021] Furthermore, the paraffin delivery system also includes a first thermometer, which is installed on the outer wall of the first jacketed filter and is adapted to detect the temperature of the paraffin inside the first jacketed filter.

[0022] Furthermore, the second branch pipeline is provided with the following sequentially along the transmission direction:

[0023] The second jacketed filter has a filter inlet and a filter outlet, and the filter inlet is connected to the second outlet end of the first three-way valve;

[0024] A backup paraffin delivery pump, wherein the backup paraffin delivery pump is provided with a pump inlet and a pump outlet, and the pump inlet is connected to the filter outlet of the second jacketed filter;

[0025] The second valve assembly is disposed between the pump outlet of the standby paraffin delivery pump and the connection port of the connecting pipe, and the second valve assembly is adapted to control the flow state of paraffin in the second branch pipeline.

[0026] Furthermore, the paraffin delivery system also includes a second thermometer, which is installed on the outer wall of the second jacketed filter and is adapted to detect the temperature of the paraffin inside the second jacketed filter.

[0027] Furthermore, the paraffin conveying system also includes a one-way valve, which is installed on the discharge pipeline. The one-way valve has a valve inlet end and a valve outlet end. The valve inlet end is connected to the second outlet end of the second three-way valve, and the valve outlet end of the one-way valve is connected to the feed port of the screw conveyor.

[0028] Furthermore, the paraffin delivery system also includes a flow meter, which is installed on the connecting pipe and located between the side wall connection port and the feed inlet of the second three-way valve.

[0029] Furthermore, the paraffin conveying system also includes a manual ball valve and a pneumatic ball valve, which are installed in series on the discharge pipeline.

[0030] Furthermore, the first branch pipeline, the second branch pipeline, the connecting pipe, and the circulation pipeline are all heat-conducting oil jacketed insulated pipelines.

[0031] Furthermore, the paraffin delivery system also includes a circulation control valve, which is installed on the circulation pipeline.

[0032] By adopting the above technical solution, this utility model has the following beneficial effects:

[0033] In this invention, after the paraffin wax flows out of the paraffin wax tank, it can be selectively directed to either the first branch pipeline or the second branch pipeline via the first three-way valve. One of these pipelines ultimately merges with the second three-way valve via a connecting pipe. The second three-way valve can switch the paraffin wax to the discharge pipeline to enter the screw conveyor, or return it to the paraffin wax tank via the circulation pipeline, ensuring continuous production. Simultaneously, the circulation pipeline can maintain the circulating flow of paraffin wax in a standby state, preventing the paraffin wax from solidifying during the transportation process.

[0034] In addition, the first thermometer and the second thermometer monitor the temperature of the first jacketed filter and the second jacketed filter, respectively; the flow meter is installed on the connecting pipe to monitor the total conveying capacity; the check valve is installed on the discharge pipe to prevent paraffin backflow; the manual ball valve and the pneumatic ball valve are installed in series on the discharge pipe to regulate the flow rate; and the circulation control valve regulates the paraffin flow rate in the circulation pipe.

[0035] In summary, this utility model, through its dual-circuit redundancy design and constant-temperature insulation structure, effectively solves the technical problems of unstable filtration and inability to switch faults in existing paraffin delivery systems, and significantly improves the reliability and stability of paraffin delivery during the production of medium and high density boards. Attached Figure Description

[0036] Figure 1 A schematic diagram of the paraffin delivery system of this utility model. Detailed Implementation

[0037] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0038] like Figure 1 As shown, a paraffin delivery system includes:

[0039] Paraffin wax tank 1, which is equipped with a paraffin wax outlet and a paraffin wax reflux inlet;

[0040] The first three-way valve 2 is provided with a feed inlet end, a first outlet end and a second outlet end, and the feed inlet end is connected to the paraffin outlet of the paraffin tank 1.

[0041] The first branch pipeline has one end connected to the first outlet end of the first three-way valve 2;

[0042] The second branch pipeline has one end connected to the second outlet end of the first three-way valve 2;

[0043] Connecting pipe 4, one end of connecting pipe 4 is connected to the other end of the first branch pipe, and the side wall of connecting pipe 4 is provided with a connecting port, which is connected to the other end of the second branch pipe;

[0044] The second three-way valve (not shown in the figure) has a feed inlet, a first outlet end and a second outlet end, and the feed inlet is connected to the other end of the connecting pipe 4.

[0045] The circulation pipeline 5 has one end connected to the first outlet end of the second three-way valve, and the other end connected to the paraffin reflux inlet of the paraffin tank 1.

[0046] Discharge pipe 6, one end of which is connected to the second outlet end of the second three-way valve;

[0047] The screw conveyor 7 has its inlet connected to the other end of the outlet pipe 6.

[0048] In this embodiment, as Figure 1As shown, after the paraffin wax flows out of the paraffin wax tank 1, it can be selected to enter either the first branch pipeline or the second branch pipeline through the first three-way valve 2. One of these pipelines ultimately merges with the second three-way valve via the connecting pipe 4. The second three-way valve can switch the paraffin wax to the discharge pipeline 6 to enter the screw conveyor 7, or return it to the paraffin wax tank 1 through the circulation pipeline 5, ensuring continuous production. Simultaneously, the circulation pipeline 5 can maintain the circulating flow of paraffin wax in the standby state, preventing the paraffin wax from solidifying during the transportation process.

[0049] Specifically, such as Figure 1 As shown, the first branch pipeline is provided with the following components along the transmission direction:

[0050] The first jacketed filter 8 is provided with a filter inlet and a filter outlet, and the filter inlet is connected to the first outlet end of the first three-way valve 2.

[0051] Paraffin delivery pump 9 is provided with a pump inlet and a pump outlet. The pump inlet is connected to the filter outlet of the first jacketed filter 8.

[0052] The first valve group 10 is located between the pump outlet of the paraffin delivery pump 9 and one end of the connecting pipe 4. The first valve group 10 is suitable for controlling the flow state of paraffin in the first branch pipeline.

[0053] Specifically, such as Figure 1 As shown, the paraffin delivery system also includes a first thermometer 11, which is installed on the outer wall of the first jacketed filter 8. The first thermometer 11 is adapted to detect the temperature of the paraffin inside the first jacketed filter 8.

[0054] Specifically, such as Figure 1 As shown, the second branch pipeline is provided with the following components along the transmission direction:

[0055] The second jacketed filter 12 is provided with a filter inlet and a filter outlet, and the filter inlet is connected to the second outlet end of the first three-way valve 2.

[0056] A spare paraffin delivery pump 14 is provided with a pump inlet and a pump outlet. The pump inlet is connected to the filter outlet of the second jacketed filter 12.

[0057] The second valve group 15 is located between the pump outlet of the standby paraffin delivery pump 14 and the connection port of the connecting pipe 4. The second valve group 15 is suitable for controlling the flow state of paraffin in the second branch pipeline.

[0058] Specifically, such as Figure 1 As shown, the paraffin delivery system also includes a second thermometer 16, which is installed on the outer wall of the second jacketed filter 12 and is adapted to detect the temperature of the paraffin inside the second jacketed filter 12.

[0059] In this embodiment, as Figure 1 As shown, when production is required, paraffin wax flows out from paraffin wax tank 1. The first three-way valve 2 allows selection of either the first branch pipeline or the second branch pipeline. When using the first branch pipeline, the paraffin wax passes through the first jacketed filter 8 to filter impurities, the first thermometer 11 monitors the paraffin wax temperature in real time, and is pressurized and transported by the paraffin wax delivery pump 9. The first valve group 10 controls the flow of the paraffin wax, which enters the connecting pipe 4, flows through the flow meter 18, and then the second three-way valve selects the output direction. When the discharge mode is selected, the paraffin wax enters the discharge pipeline 6 through the second outlet end of the second three-way valve. Controlled by the manual ball valve 19 and the pneumatic ball valve 20, and prevented from flowing back by the check valve 17, it enters the screw conveyor 7. When the circulation mode is selected, the paraffin wax enters the circulation pipeline 5 through the first outlet end of the second three-way valve, and after being controlled by the circulation control valve 21, it flows back to the paraffin wax tank 1.

[0060] The second branch pipeline serves as a backup pathway, with a structure similar to the first branch pipeline. It can be activated when the first branch pipeline requires maintenance or malfunctions. Paraffin wax enters the second branch pipeline through the second outlet of the first three-way valve 2, is filtered by the second jacketed filter 12, and its temperature is monitored by the second thermometer 16. It is then pressurized and transported by the backup paraffin wax delivery pump 14, with the flow controlled by the second valve group 15. Finally, it enters the main channel of the connecting pipe 4 through the connecting port, and the subsequent process is the same as that of the first branch pipeline. Both the paraffin wax delivery pump 9 and the backup paraffin wax delivery pump 14 are driven by electric motors; alternatively, a hydraulic motor or a combination of a hydraulic motor and a reducer can be used as the drive source.

[0061] The first jacketed filter 8, the second jacketed filter 12, and the connecting pipe 4 in the paraffin conveying system all adopt a heat-conducting oil jacketed insulated pipe structure to ensure that the paraffin maintains a suitable temperature throughout the conveying process. The pneumatic ball valve 20 can be remotely controlled according to production needs; while the manual ball valve 19 can be manually adjusted when needed. The screw conveyor 7 can use an electric screw mechanism to ensure stable paraffin output.

[0062] Specifically, such as Figure 1 As shown, the paraffin conveying system also includes a one-way valve 17, which is installed on the discharge pipeline 6. The one-way valve 17 has a valve inlet end and a valve outlet end. The valve inlet end is connected to the second outlet end of the second three-way valve, and the valve outlet end of the one-way valve 17 is connected to the feed port of the screw conveyor 7.

[0063] Specifically, such as Figure 1 As shown, the paraffin conveying system also includes a flow meter 18, which is installed on the connecting pipe 4 and located between the side wall connection port and the feed inlet of the second three-way valve.

[0064] In this embodiment, as Figure 1As shown, flow meter 18 is used to monitor the flow rate of paraffin in the paraffin delivery system.

[0065] The flow meter 18 can be a turbine flow meter, electromagnetic flow meter, mass flow meter or Coriolis flow meter, etc., and the appropriate type should be selected according to the physical properties of paraffin.

[0066] In the paraffin conveying circulation mode, the flow meter 18 can monitor the amount of paraffin returning to the paraffin tank 1; in the discharge mode, the flow meter 18 can monitor the amount of paraffin conveyed to the screw conveyor 7.

[0067] Specifically, such as Figure 1 As shown, the paraffin conveying system also includes a manual ball valve 19 and a pneumatic ball valve 20, which are connected in series on the discharge pipeline 6.

[0068] In this embodiment, as Figure 1 As shown, a manual ball valve 19 and a pneumatic ball valve 20 are connected in series on the discharge pipe 6 to control the flow of paraffin wax from the discharge pipe 6 to the screw conveyor 7. The manual ball valve 19 is manually operated; the operator can control the opening and closing of the valve by rotating the handle, making it suitable for applications requiring manual intervention. The pneumatic ball valve 20 can be remotely controlled.

[0069] During normal production, the manual ball valve 19 remains open, and the output of paraffin is mainly controlled by the pneumatic ball valve 20; when the system needs maintenance or an emergency occurs, emergency shut-off can be achieved through the manual ball valve 19.

[0070] Specifically, such as Figure 1 As shown, the first branch pipeline, the second branch pipeline, the connecting pipe 4, and the circulation pipeline 5 are all heat transfer oil jacketed insulated pipelines.

[0071] In this embodiment, as Figure 1 As shown, the first branch pipe, the second branch pipe, the connecting pipe 4, and the circulation pipe 5 are all heat transfer oil jacketed insulated pipes. The heat transfer oil jacketed insulated pipe consists of two layers of pipes, an inner layer for transporting paraffin wax, and an outer layer forming an annular space filled with heat transfer oil as the heat medium. The heat transfer oil, heated by an external heat source, circulates within the jacket, transferring heat to the paraffin wax in the inner pipe and maintaining the paraffin wax at a suitable temperature.

[0072] Specifically, such as Figure 1 As shown, the paraffin delivery system also includes a circulation control valve 21, which is installed on the circulation pipeline 5.

[0073] In this embodiment, as Figure 1As shown, the circulation control valve 21 is installed on the circulation pipeline 5 to control the flow state of paraffin wax in the circulation loop. The circulation control valve 21 can adjust its opening degree according to process requirements to control the amount of paraffin wax returning to the paraffin wax tank 1, maintaining a constant circulation of paraffin wax in the system. The circulation control valve 21 ensures that the system can maintain the fluidity of paraffin wax in standby mode, avoiding pipeline blockage caused by prolonged stagnation.

[0074] In the standby state of the paraffin delivery system, when the first outlet end of the second three-way valve is opened, the paraffin flows back to the paraffin tank 1 through the circulation pipeline 5, forming a closed loop. The circulation control valve 21 can be a ball valve, butterfly valve, or regulating valve, etc.

[0075] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A paraffin delivery system characterized by, Comprising: a paraffin tank (1) provided with a paraffin outlet and a paraffin return inlet; a first three-way valve (2) provided with a feed inlet end, a first outlet end and a second outlet end, the feed inlet end being in communication with the paraffin outlet of the paraffin tank (1); a first branch pipeline, one end of which being in communication with the first outlet end of the first three-way valve (2); a second branch pipeline, one end of which being in communication with the second outlet end of the first three-way valve (2); a connecting pipe (4), one end of which being in communication with the other end of the first branch pipeline, the side wall of the connecting pipe (4) being provided with a communication port, the communication port being in communication with the other end of the second branch pipeline; a second three-way valve, the second three-way valve being provided with a feed inlet, a first outlet end and a second outlet end, the feed inlet being in communication with the other end of the connecting pipe (4); a circulation pipeline (5), one end of the circulation pipeline (5) being in communication with the first outlet end of the second three-way valve, the other end of the circulation pipeline (5) being in communication with the paraffin return inlet of the paraffin tank (1); a discharge pipeline (6), one end of the discharge pipeline (6) being in communication with the second outlet end of the second three-way valve; a screw conveyor (7), the feed port of the screw conveyor (7) being in communication with the other end of the discharge pipeline (6).

2. The paraffin conveying system according to claim 1, wherein the first branch pipeline is sequentially provided with, along the conveying direction: a first jacketed filter (8) provided with a filter inlet and a filter outlet, the filter inlet being in communication with the first outlet end of the first three-way valve (2); a paraffin conveying pump (9) provided with a pump inlet and a pump outlet, the pump inlet being in communication with the filter outlet of the first jacketed filter (8); a first valve group (10) arranged between the pump outlet of the paraffin conveying pump (9) and one end of the connecting pipe (4), the first valve group (10) being adapted to control the flow state of paraffin in the first branch pipeline. Further comprising a first thermometer (11) mounted on the outer wall of the first jacketed filter (8), the first thermometer (11) being adapted to detect the temperature of paraffin in the first jacketed filter (8).

3. The paraffin delivery system of claim 2, wherein:

4. The paraffin conveying system according to claim 1, wherein the second branch pipeline is sequentially provided with, along the conveying direction: a second jacketed filter (12) provided with a filter inlet and a filter outlet, the filter inlet being in communication with the second outlet end of the first three-way valve (2); a standby paraffin conveying pump (14) provided with a pump inlet and a pump outlet, the pump inlet being in communication with the filter outlet of the second jacketed filter (12); ​ ​ A second valve group (15) is arranged between the pump outlet of the standby paraffin delivery pump (14) and the communicating port of the connecting pipe (4), and is adapted to control the flow state of paraffin in the second branch pipe.

5. The paraffin delivery system of claim 4, wherein: A second thermometer (16) is also included, which is installed on the outer wall of the second jacket filter (12) and is adapted to detect the temperature of paraffin in the second jacket filter (12).

6. The paraffin delivery system of claim 1, wherein: A one-way valve (17) is also included, which is installed on the discharge pipeline (6) and is provided with a valve inlet end and a valve outlet end. The valve inlet end is communicated with the second outlet end of the second three-way valve, and the valve outlet end is communicated with the feeding port of the screw conveyor (7).

7. The paraffin delivery system of claim 1, wherein: A flowmeter (18) is also included, which is installed on the connecting pipe (4) between the side wall communicating port and the feeding inlet of the second three-way valve.

8. The paraffin transport system of claim 1, wherein: A manual ball valve (19) and a pneumatic ball valve (20) are also included, which are installed in series on the discharge pipeline (6).

9. The paraffin delivery system of claim 1, wherein: The first branch pipe, the second branch pipe, the connecting pipe (4) and the circulating pipeline (5) are all heat-conducting oil jacketed heat preservation pipes.

10. The paraffin transport system of claim 1, wherein: A circulating control valve (21) is also included, which is installed on the circulating pipeline (5).

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