Self-control type hot-pressing system with steam exhaust energy saving and control method thereof

Abstract

The application discloses a self-control type hot-pressing system with steam exhaust energy saving and a control method thereof, which is divided into three parts of heating steam exhaust, automatic control and water vapor collection and separation. The opening and closing of each valve are automatically controlled to realize steam exhaust and separation and collection of steam generated at a mold, and the collected steam can be sent back to the mold for heating the mold. The system has the characteristics of automatic control, fast exhaust speed, automatic water vapor separation, hot steam backflow heating product, low overall energy consumption and the like. Water and hot steam generated when a wet blank is hot-pressed in a hot-pressing forming process are automatically controlled through a control valve, and are collected in a water collecting tank and a hot steam tank after being separated. After vacuum suction, the water and hot steam are in a low-pressure state, the evaporation temperature of water in the wet blank is reduced, and the energy consumption is reduced. Finally, the hot steam stored in the hot steam tank is made to flow back to heat the lower mold through the control valve or a fan, so that the energy consumption of the overall hot-pressing process is greatly reduced, and the production cost is saved.

Description

Technical Field

[0001] This invention relates to a hot pressing system for hot pressing wet blanks and its control method, and more particularly to a self-controlled hot pressing system with exhaust steam saving and its control method. Background Technology

[0002] The original hot press mold heating plate is located below the lower mold. During the hot pressing process, a large amount of water vapor is generated. The water vapor will remain in the two molds, resulting in slow water vapor discharge. Moreover, the water vapor cannot be recycled after discharge, and the heat carried by the high temperature water vapor is lost, resulting in waste and insufficient energy saving.

[0003] In addition, water and high-temperature steam are generated during the hot pressing process of hot pressing wet blanks. Existing molds use natural discharge of water and high-temperature steam under atmospheric pressure, without the function of automatic suction and recycling, which leads to the following disadvantages: 1. It stays in the mold cavity during discharge, resulting in slow discharge speed; 2. The heat of high-temperature steam and water will be lost and cannot be recovered and reused. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art by proposing a belt cutting saw.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A self-controlled hot pressing system with energy-saving exhaust includes a control section and a hot pressing section and a steam exhaust recovery and utilization section controlled by the control section. The hot pressing section is a hot pressing mold with an exhaust channel inside. The exhaust channel includes a mold cavity, an exhaust hole, a steam chamber, an exhaust duct, and a water vapor collection chamber connected in sequence. The outlet of the water vapor collection chamber is connected to the steam exhaust recovery and utilization section, which includes three pipelines connected to the outlet. The three pipelines are a low-pressure suction pipeline, a circulation separation pipeline, and a circulation recovery pipeline. The suction pipeline is connected to the outside and is equipped with a suction vacuum valve. The circulation separation pipeline is connected to a water vapor separation mechanism and is equipped with an outlet valve for controlling the connection of the pipeline. The circulation recovery pipeline is connected to the gas section of the water vapor separation mechanism and is equipped with a circulation recovery valve for controlling the connection of the pipeline.

[0007] Preferably, the water vapor separation mechanism includes a hot steam tank, a water vapor isolation valve, and a water collection point. The end of the circulation recovery pipeline is divided into two branches, one of which is connected to the water collection tank and the other is connected to the water vapor isolation valve, which is connected to the hot steam tank. The water collection tank is equipped with a drainage pipeline, and a drain valve is provided on the drainage pipeline.

[0008] Preferably, the hot steam tank is equipped with a first vent pipe that connects to the outside and a first vent valve; the circulating recovery pipeline is equipped with a second vent pipe that connects to the outside and a second vent valve.

[0009] Preferably, the circulation recovery pipeline is equipped with a first circulation recovery valve and a second circulation recovery valve. The first circulation recovery valve is located on one side of the hot steam tank. A power replenishment pipeline is provided between the first circulation recovery valve and the second circulation recovery valve, and between the second circulation recovery valve and the outlet. A fan and a steam inlet valve are provided on the power replenishment pipeline.

[0010] As a preferred option, a branch pipe connected to the outside is provided on the power supplement pipeline between the fan and the steam inlet valve, and the branch pipe is equipped with a suction and exhaust valve.

[0011] Preferably, the hot pressing mold includes an upper mold and a lower mold, with a sealing structure between the upper mold and the lower mold; the lower mold is provided with a steam venting mechanism, which includes a steam vent hole located in the lower mold and communicating with each mold cavity, as well as a steam cavity and a water vapor collection cavity located in the lower mold. The mold cavity, steam vent hole, steam cavity and water vapor collection cavity are sequentially connected to form a steam venting channel, and the steam venting channel is connected to the pipeline of the steam venting system.

[0012] Preferably, the lower mold includes a lower mold, a steam chamber plate, and a lower heat insulation plate arranged sequentially from top to bottom. The steam vent is located inside the lower mold and there are multiple sets of them, each set corresponding to a mold cavity. The steam chamber plate is provided with several steam chambers, and each steam chamber corresponds to one set of steam vents. The lower heat insulation plate is provided with a water vapor conduit, and the water vapor collection chamber is located below the water vapor conduit, and the steam chamber is connected to the water vapor collection chamber through the water vapor conduit.

[0013] Preferably, the upper mold includes an upper heat insulation plate, a heating plate and an upper mold arranged sequentially from top to bottom, with the upper heat insulation plate and the movable middle plate fixed to the output end of the lifting cylinder arranged at the top.

[0014] Preferably, the sealing structure includes an annular sealing boss disposed on the top surface of the lower mold, with a mesh frame disposed inside the sealing boss; several annular sealing bosses are provided, each sealing boss being disposed around the mold cavity and surrounding the mold cavity inside; at least two annular sealing rings are embedded on the sealing bosses; the sealing rings are of two types: circular cross-section and rectangular cross-section.

[0015] Preferably, a rust-proof plate is provided below the lower insulation plate, and a shell with a water vapor collection chamber is connected to the rust-proof plate via a flange; the rust-proof plate has several through holes for connecting the water vapor duct and the steam collection chamber; the water vapor collection chamber is a conical structure with a diameter that gradually decreases from top to bottom, and its exhaust port is located at the bottom.

[0016] A control method for a steam-exhaust energy-saving self-controlled hot pressing system includes a control unit connected to the lifting cylinder and heating plate of the hot pressing section. The control unit controls the mold closing action of the lifting cylinder and also controls the heating temperature of the heating plate. The control unit is also connected to various valves and fans in the steam exhaust recovery and utilization section to control the transport of water vapor in each pipeline section. The control method includes the following steps: S1, controlling the heating plate to heat to the set temperature; S2, controlling the lifting cylinder to lift and lower to complete the mold closing action; S3, in this step, the transport of water vapor includes two lines: one is where the control unit controls the closure of other valves and opens the suction vacuum valve to extract water and steam from the exhaust channel; the other is where the control unit controls the closure of the suction vacuum valve and opens the valve on the circulation separation pipeline. The door transports water and steam to the water-vapor separation mechanism for water-vapor separation. After separation, the steam is located in the hot steam tank. The control unit controls the opening of the valve of the steam circulation recovery pipeline and the closing of the valves at other pipelines to transport the steam to the steam chamber of the lower mold to heat the lower mold. The steam circulation recovery pipeline includes two parallel pipelines, which are switched to one with a fan when the steam pressure is low. In addition, in this step, the parallel pipelines in the circulation separation pipeline, steam circulation recovery pipeline and gas circulation recovery pipeline are equipped with steam exhaust pipelines and corresponding control valves to discharge the steam or vapor in the pipelines; S4, the water separated by the water-vapor separation mechanism is collected through the water collection tank, and discharged through the drain valve when the water level in the water collection tank reaches the preset value.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In the hot pressing process of the present application, the water and hot steam generated during the hot pressing of the wet blank are first automatically controlled by the control valve and then collected in the water collection tank and the hot steam tank respectively after separation; then, after vacuum suction, they are in a low-pressure state, which reduces the evaporation temperature of water in the wet blank and reduces energy consumption; finally, the hot steam stored in the hot steam tank is refluxed to heat the lower mold again by the control valve or the fan, thereby greatly reducing the energy consumption of the overall hot pressing process and saving production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the principle of the present invention.

[0019] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0020] In the diagram: 101—Heating plate, 102—Upper heat insulation plate, 103—Upper mold, 104—Sealing structure, 1041—Sealing boss, 1042—Sealing ring (rectangular cross-section), 1043—Sealing ring (circular cross-section), 105—Lower mold, 1051—Mesh frame, 106—Steam chamber plate, 1061—Steam chamber, 107—Lower heat insulation plate, 108—Steam vent, 109—Steam duct, 110—Rust-proof plate, 111—Water vapor collection chamber, 112—Exit outlet, 201—Suction pipe 202—Outlet valve, 203—Circulation recovery pipeline, 204—Suction vacuum valve, 205—Circulation separation pipeline, 206—Water vapor isolation valve, 207—Water tank, 208—Hot steam tank, 209—First circulation recovery valve, 210—Second circulation recovery valve, 211—Power replenishment pipeline, 212—Fan, 213—Steam inlet valve, 214—Suction exhaust valve, 215—Water drain valve, 216—Second vent valve, 217—First vent valve. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figures 1-2 A self-controlled hot pressing system with energy-saving exhaust includes a control section, a hot pressing section controlled by the control section, and a steam exhaust recovery and utilization section. The hot pressing section is a hot pressing mold, which has an exhaust channel. The exhaust channel includes a mold cavity, an exhaust hole 108, a steam chamber 1061, an exhaust duct 109, and a water vapor collection chamber 111 connected in sequence. The outlet 112 of the water vapor collection chamber 111 is connected to the steam exhaust recovery and utilization section, which includes components connected to the outlet 112. The system consists of three interconnected pipelines: a low-pressure suction pipeline 201, a circulation separation pipeline 205, and a circulation recovery pipeline 203. The suction pipeline 201 is connected to the outside environment and is equipped with a suction vacuum valve 204. The circulation separation pipeline 205 is connected to the water vapor separation mechanism and is equipped with an outlet valve 202 for controlling the connection of the pipeline. The circulation recovery pipeline 203 is connected to the gas section of the water vapor separation mechanism and is equipped with a circulation recovery valve for controlling the connection of the pipeline.

[0023] Preferably, the water vapor separation mechanism includes a hot steam tank 208, a water vapor isolation valve 206, and a water collection point. The end of the circulation recovery pipeline 203 is divided into two branches, one of which is connected to the water collection tank 207, and the other branch is connected to the water vapor isolation valve 206. The water vapor isolation valve 206 is connected to the hot steam tank 208. The water collection tank 207 is provided with a drainage pipeline, and a drain valve 215 is provided on the drainage pipeline.

[0024] Preferably, the hot steam tank 208 is provided with a first vent pipe that connects to the outside, and the first vent pipe is equipped with a first vent valve 217; the circulation recovery pipeline 203 is provided with a second vent pipe that connects to the outside, and the second vent pipe is equipped with a second vent valve 216.

[0025] Preferably, the circulation recovery pipeline 203 is provided with a first circulation recovery valve 209 and a second circulation recovery valve 210. The first circulation recovery valve 209 is located on one side of the hot steam tank 208. A power supplement pipeline 211 is provided between the first circulation recovery valve 209 and the second circulation recovery valve 210, and between the second circulation recovery valve 210 and the outlet 112. A fan 212 and a steam inlet valve 213 are provided on the power supplement pipeline 211.

[0026] As a preferred embodiment, a branch pipe connected to the outside is provided on the power supplement pipeline 211 between the fan 212 and the steam inlet valve 213, and a suction and exhaust valve 214 is provided on the branch pipe.

[0027] Preferably, the hot pressing mold includes an upper mold and a lower mold, with a mold-closing sealing boss 1041 between the upper mold and the lower mold; the lower mold is provided with a steam venting mechanism, which includes a steam venting hole 108 disposed in the lower mold and communicating with each mold cavity, as well as a steam cavity 1061 and a water vapor collection cavity 111 disposed in the lower mold. The mold cavity, the steam venting hole 108, the steam cavity 1061 and the water vapor collection cavity 111 are sequentially connected to form a steam venting channel, and the steam venting channel is connected to the pipeline of the steam venting system.

[0028] Preferably, the lower mold includes a lower mold 105, a steam chamber plate 106, and a lower heat insulation plate 107 arranged sequentially from top to bottom. The steam vent 108 is arranged in the lower mold 105 in multiple sets, each set corresponding to a mold cavity. The steam chamber plate 106 is provided with a number of steam chambers 1061, and the steam chambers 1061 correspond one-to-one with each set of steam vent 108. The lower heat insulation plate 107 is provided with a water vapor conduit, and the water vapor collection chamber 111 is arranged below the water vapor conduit, and the steam chambers 1061 are connected to the water vapor collection chamber 111 through the water vapor conduit.

[0029] Preferably, the upper mold includes an upper heat insulation plate 102, a heating plate 101 and an upper mold 103 arranged sequentially from top to bottom, with the upper heat insulation plate 102 and the movable middle plate fixed to the output end of the lifting cylinder arranged at the top.

[0030] Preferably, the sealing boss 1041 includes an annular sealing boss disposed on the top surface of the lower mold, and a mesh frame 1051 is disposed on the inner side of the sealing boss; a plurality of annular sealing bosses are disposed, each sealing boss being disposed around the mold cavity and surrounding the mold cavity inside; at least two annular sealing rings are embedded on the sealing bosses; the sealing rings are of two types: circular cross-section and rectangular cross-section.

[0031] Preferably, a rust-proof plate 110 is provided below the lower heat insulation plate 107, and a shell with a water vapor collection chamber 111 is connected to the lower part of the rust-proof plate 110 via a flange; the rust-proof plate 110 is provided with several through holes, which are used to connect the water vapor duct and the steam collection chamber; the water vapor collection chamber 111 is a conical structure with a diameter that gradually decreases from top to bottom, and its exhaust port 108 is located at the bottom.

[0032] A control method for a steam-exhaust energy-saving self-controlled hot pressing system includes a control unit connected to the lifting cylinder and heating plate 101 of the hot pressing section. The control unit controls the mold closing action of the lifting cylinder and the heating temperature of the heating plate 101. It is also connected to the valves and fan 212 of the steam exhaust recovery and utilization section to control the transport of water vapor in each pipeline section. The control method includes the following steps: S1, controlling the heating plate 101 to heat to the set temperature; S2, controlling the lifting cylinder to lift and lower to complete the mold closing action; S3, in this step, the transport of water vapor includes two lines: one is where the control unit controls the closure of other valves and opens the suction vacuum valve 204 to extract water and steam from the exhaust channel; the other is where the control unit controls the closure of the suction vacuum valve 204 and opens the valve on the circulation separation pipeline 205 to release water and steam. The steam is transported to the steam separation mechanism for steam separation. After separation, the steam is located in the hot steam tank 208. The control unit controls the opening of the valve of the steam circulation recovery pipeline 203 and the closing of the valves at other pipelines to transport the steam to the steam chamber 1061 of the lower mold for heating. The steam circulation recovery pipeline 203 includes two parallel pipelines, which are switched to one with a fan 212 when the steam pressure is low. In addition, in this step, the parallel pipelines in the circulation separation pipeline 205, the steam circulation recovery pipeline 203 and the gas circulation recovery pipeline 203 are all equipped with steam discharge pipelines and corresponding control valves to discharge the steam in the pipelines. S4, the water separated by the steam separation mechanism is collected through the water collection tank 207 and discharged through the drain valve 215 when the water level in the water collection tank 207 reaches the preset value.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-controlled hot pressing system with exhaust energy saving, comprising a control section and a hot pressing section and a steam exhaust recovery and utilization section controlled by the control section, wherein the control section and the hot pressing section are characterized in that: The hot pressing section is a hot pressing mold, which contains a steam venting channel. This channel includes a mold cavity, a steam vent, a steam chamber, a steam duct, and a water vapor collection chamber connected sequentially. The outlet of the water vapor collection chamber connects to a steam emission recovery and utilization section. This section includes three pipelines connected to the outlet: a low-pressure suction pipeline, a circulation separation pipeline, and a circulation recovery pipeline. The suction pipeline is connected to the outside and equipped with a suction vacuum valve. The circulation separation pipeline connects to a water vapor separation mechanism and is equipped with an outlet valve to control its connection. The circulation recovery pipeline connects to the gas section of the water vapor separation mechanism and is equipped with a circulation recovery valve to control its connection. The water vapor separation mechanism includes a hot steam tank, a water vapor isolation valve, and a water collection area. The end of the circulation recovery pipeline branches into two branches. One branch line connects to a water tank, and the other branch line connects to a water vapor isolation valve, which in turn connects to a steam tank. The water tank has a drain pipe with a drain valve. The steam tank has a first empty pipe connected to the outside, equipped with a first empty valve. A second empty pipe connected to the outside is located on the circulation recovery pipe, equipped with a second empty valve. The circulation recovery pipe has a first circulation recovery valve and a second circulation recovery valve. The first circulation recovery valve is located on one side of the steam tank. Power supply pipes are located between the first and second circulation recovery valves, and between the second circulation recovery valve and the outlet. These power supply pipes include a fan and a steam inlet valve. A branch pipe connected to the outside is located on the power supply pipe between the fan and the steam inlet valve, equipped with a suction and exhaust valve. The control unit is connected to the lifting cylinder and heating plate of the hot pressing section to control the mold closing of the lifting cylinder and also to control the heating temperature of the heating plate. The control unit is connected to the various valves and fans of the steam emission recovery and utilization section to control the transportation of water vapor in each section of the pipeline; the control method includes the following steps: S1, the control unit controls the heating plate to heat up to the set temperature; S2, the control unit controls the lifting cylinder to lift and lower to complete the mold closing action; S3, in this step, the water vapor transport includes two lines. First, the control unit closes the suction vacuum valve and opens the valve on the circulation separation pipeline to transport water and steam to the water vapor separation mechanism for separation. Second, the control unit closes other valves and opens the suction vacuum valve to extract the remaining water and steam from the exhaust channel and reduce the pressure inside the mold, thus lowering the evaporation temperature of the water in the wet preform. The separated steam is located in a hot steam tank. The control unit opens the valve on the steam circulation recovery pipeline and closes the valves on other pipelines to transport the steam from the steam tank to the lower mold. The lower mold is heated in the steam chamber. The steam circulation and recovery pipeline includes two parallel pipelines, which are switched to one with a fan when the steam pressure is low. In addition, the pipeline from the exhaust port to the second circulation recovery valve, the fan, and the suction exhaust valve can be used alone or together with the pipeline from the exhaust port to the suction vacuum valve to extract the remaining water and steam in the exhaust channel after recovery. Finally, in this step, the parallel pipelines in the circulation separation pipeline, the steam circulation and recovery pipeline, and the gas circulation and recovery pipeline are all equipped with external steam discharge pipelines and corresponding control valves to discharge the steam or vapor in the pipelines. S4 collects the water separated by the water vapor separation mechanism through the water collection tank, and discharges it through the drain valve when the water level in the water collection tank reaches the preset value.

2. The self-controlled hot press system with exhaust steam energy saving according to claim 1, characterized in that: The hot press mold includes an upper mold and a lower mold, with a sealing structure between the upper mold and the lower mold; the lower mold is equipped with a steam venting mechanism, which includes a steam vent hole located in the lower mold and connected to each mold cavity, as well as a steam cavity and a water vapor collection cavity located in the lower mold. The mold cavity, steam vent hole, steam cavity and water vapor collection cavity are connected in sequence to form a steam venting channel, which is connected to the pipeline of the steam venting system.

3. The self-controlled hot press system with exhaust steam energy saving according to claim 1, characterized in that: The lower mold includes a lower mold, a steam chamber plate, and a lower heat insulation plate arranged sequentially from top to bottom. The steam vent is located inside the lower mold and there are multiple sets of them, each set corresponding to a mold cavity. The steam chamber plate is provided with several steam chambers, and each steam chamber corresponds to one set of steam vents. The lower heat insulation plate is provided with a water vapor conduit, and the water vapor collection chamber is located below the water vapor conduit, and the steam chamber is connected to the water vapor collection chamber through the water vapor conduit.

4. The self-controlled hot press system with exhaust steam energy saving according to claim 3, characterized in that: The upper mold includes an upper heat insulation plate, a heating plate and an upper mold arranged from top to bottom. The upper heat insulation plate and the movable middle plate are fixed to the output end of the lifting cylinder arranged at the top.

5. The self-controlled hot press system with exhaust steam energy saving according to claim 3, characterized in that: The sealing structure includes an annular sealing boss located on the top surface of the lower mold, with a mesh frame inside the sealing boss; several annular sealing bosses are provided, each sealing boss surrounding the mold cavity and enclosing the mold cavity inside; at least two annular sealing rings are embedded on the sealing bosses; the sealing rings are of two types: circular cross-section and rectangular cross-section.

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