Vacuum negative pressure device for lost foam casting

Abstract

The utility model relates to the technical field of casting, in particular to a vacuum negative pressure device for lost foam casting. According to the technical scheme, the device comprises a mounting bottom plate, a vacuum pump is arranged above the mounting bottom plate, a pressure stabilizing assembly is arranged at the position, located on the mounting bottom plate, of the air inlet end of the vacuum pump, a filtering assembly is arranged on one side of the pressure stabilizing assembly, a negative pressure pipe is arranged on a connecting pipe, and a vacuum distribution mechanism is arranged at the end, away from the connecting pipe, of the negative pressure pipe. The filtering assembly adopts a multi-layer composite filtering structure, so that impurities in gas can be efficiently removed, meanwhile, the system pressure can be monitored and adjusted in real time through an intelligent central controller in the pressure stabilizing assembly, pressure fluctuation is effectively buffered, a stable negative pressure environment is provided for lost foam casting, and the production efficiency is improved. And meanwhile, the vacuum distribution mechanism is designed in a modularized mode, negative pressure distribution can be accurately controlled according to different production requirements, the air exhaust efficiency is improved, and the production efficiency of lost foam casting and the precision of castings can be improved.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a vacuum negative pressure device for lost foam casting. Background Technology

[0002] Lost foam casting, as an advanced casting process, has many advantages, such as eliminating the need for parting and core setting, and being suitable for the production of complex-shaped castings. In the lost foam casting process, a vacuum negative pressure device plays a crucial role; it compacts the molding sand within the sand box and extracts the gas generated by the vaporization of the foam model during pouring.

[0003] However, existing vacuum negative pressure devices for lost foam casting have some shortcomings. Firstly, the gas extracted from the sand box often contains impurities such as molding sand dust and fumes. These impurities can easily clog vacuum pumps and other equipment, affecting their normal operation, reducing equipment lifespan, and increasing maintenance costs. Secondly, existing devices lack pressure stabilization performance, resulting in significant system pressure fluctuations. This can adversely affect the casting process and make it difficult to guarantee the quality stability of castings. Furthermore, in scenarios requiring large-scale production, existing vacuum negative pressure devices struggle to meet the demands for efficient and precise production in terms of extraction efficiency and vacuum control. Therefore, we propose a new vacuum negative pressure device for lost foam casting. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a vacuum negative pressure device for lost foam casting.

[0005] The technical solution of this utility model is as follows: A vacuum negative pressure device for lost foam casting includes a mounting base plate, a vacuum pump is arranged above the mounting base plate, a pressure stabilizing component is arranged on the mounting base plate at the air inlet end of the vacuum pump, a filter component is arranged on one side of the pressure stabilizing component, the filter component is respectively provided with a coarse filter screen and a fine filter layer, a connecting pipe is arranged between the vacuum pump and the pressure stabilizing component, a negative pressure pipe is arranged on the connecting pipe, and a vacuum distribution mechanism is arranged at the end of the negative pressure pipe away from the connecting pipe. The vacuum distribution mechanism includes a vacuum distributor, and multiple sets of distribution pipes are symmetrically arranged on the vacuum distributor. Each set of distribution pipes is provided with a flow regulating valve and a vacuum degree monitoring instrument.

[0006] Preferably, the mounting end of the vacuum pump is installed corresponding to the upper side of the mounting base plate, the pressure stabilizing component includes a pressure stabilizing tank, the mounting end of the pressure stabilizing tank is installed corresponding to the upper side of the mounting base plate, one end of the connecting pipe is installed corresponding to the air inlet of the vacuum pump, and the other end of the connecting pipe is installed corresponding to the air outlet of the pressure stabilizing tank.

[0007] Preferably, an intelligent control center is provided above the pressure stabilizing tank, and a pressure display and a pressure sensor are also provided on one side of the intelligent control center on the pressure stabilizing tank. The intelligent control center is electrically connected to the pressure display and the pressure sensor respectively.

[0008] Preferably, the mounting end of the filter assembly is installed corresponding to the upper side of the mounting base plate, the mounting ends of the coarse filter screen and the fine filter layer are both installed corresponding to the inner wall of the filter assembly, and activated carbon particles are filled between the coarse filter screen and the fine filter layer inside the filter assembly.

[0009] Preferably, a connecting pipe is provided between the top of the filter assembly and the pressure stabilizing tank, and an air inlet valve is provided on the connecting pipe. The intelligent control center is electrically connected to the air inlet valve.

[0010] Preferably, one end of the negative pressure pipe is installed correspondingly to the connecting pipe, the negative pressure pipe and the connecting pipe are in communication, a control valve is provided on the connecting pipe on one side of the negative pressure pipe, and the fine filter layer is electrically connected to the control valve.

[0011] Preferably, a stable base is provided on the mounting base plate, the mounting end of the vacuum distributor is installed corresponding to the top of the stable base, one end of the negative pressure pipe is installed corresponding to the connection end of the vacuum distributor, the mounting end of the distribution pipe is installed corresponding to the vacuum distributor, each set of the distribution pipes can be assembled with a set of sand boxes respectively, and the mounting ends of the flow regulating valve and the vacuum degree monitor are respectively installed corresponding to the distribution pipes.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] This invention features a simple overall structure. The multi-layer composite filtration system efficiently removes impurities from the gas, significantly reducing clogging and wear on equipment such as vacuum pumps, extending equipment lifespan, and lowering maintenance costs. Simultaneously, the intelligent control unit in the pressure stabilizing component monitors and adjusts system pressure in real time, effectively buffering pressure fluctuations and providing a stable negative pressure environment for lost foam casting. This ensures the smooth progress of the casting process and improves the quality stability of the castings. Furthermore, the modular design of the vacuum distribution mechanism allows for precise control of negative pressure distribution according to different production needs, improving pumping efficiency. This ensures that each sand box can be compacted and poured under a stable and suitable negative pressure, contributing to increased production efficiency and casting precision in lost foam casting, meeting the demands of large-scale production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2This is a schematic diagram of the structure of this utility model from another perspective;

[0016] Figure 3 This is a cross-sectional view of the filter component in this utility model.

[0017] Reference numerals: 1. Mounting base plate; 2. Vacuum pump; 3. Pressure stabilizing assembly; 31. Pressure stabilizing tank; 32. Intelligent control center; 33. Pressure display; 34. Pressure sensor; 4. Filter assembly; 41. Coarse filter screen; 42. Fine filter layer; 5. Connecting pipe; 6. Negative pressure pipe; 7. Vacuum distribution mechanism; 71. Vacuum distributor; 72. Distribution pipe; 73. Flow regulating valve; 74. Vacuum degree monitor; 8. Connecting pipe; 9. Inlet valve; 10. Stable base; 11. Activated carbon granules. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example

[0020] like Figure 1-3As shown, this utility model proposes a lost foam casting vacuum negative pressure device, including a mounting base plate 1. A vacuum pump 2 is mounted on the top of the mounting base plate 1, with the mounting end of the vacuum pump 2 corresponding to one side of the top of the mounting base plate 1. The mounting end of the vacuum pump 2 is fixedly connected to the mounting base plate 1 by anchor bolts. A pressure stabilizing component 3 is mounted on the mounting base plate 1 at the air inlet end of the vacuum pump 2. The pressure stabilizing component 3 includes a pressure stabilizing tank 31, with the mounting end of the pressure stabilizing tank 31 corresponding to the top of the mounting base plate 1 and fixedly connected to the mounting base plate 1. A connecting pipe 5 is provided between the vacuum pump 2 and the pressure stabilizing component 3. One end of the connecting pipe 5 is installed corresponding to the air inlet of the vacuum pump 2 and fixedly connected to the air inlet of the vacuum pump 2. The other end of the connecting pipe 5 is installed corresponding to the air outlet pipe of the pressure stabilizing tank 31 and fixedly connected to the air outlet pipe of the pressure stabilizing tank 31. The connecting pipe 5 allows the vacuum pump 2 and the pressure stabilizing tank 31 to be assembled in a sealed manner, ensuring the vacuum pump 2... To ensure a tight seal between the pressure stabilizing tank 31 and the pressure tank 31, an intelligent control center 32 is installed above the pressure stabilizing tank 31. A pressure display 33 and a pressure sensor 34 are also installed on one side of the intelligent control center 32 on the pressure stabilizing tank 31. The mounting ends of the intelligent control center 32, pressure display 33, and pressure sensor 34 are all fixedly connected to the pressure stabilizing tank 31. The pressure sensor 34 allows for accurate monitoring of pressure changes inside the pressure stabilizing tank 31, and the pressure display 33 displays the pressure value detected by the pressure sensor 34. The intelligent control center 32 is electrically connected to both the pressure display 33 and the pressure sensor 34. The intelligent control center 32 allows the operator to set a threshold for pressure changes. Through its interaction with the pressure display 33 and pressure sensor 34, it can monitor and adjust the system pressure in real time, effectively buffering pressure fluctuations, providing a stable negative pressure environment for lost foam casting, ensuring the smooth progress of the casting process, and improving the quality stability of the castings.

[0021] A filter assembly 4 is installed on one side of the pressure stabilizing component 3. The mounting end of the filter assembly 4 is installed corresponding to the upper side of the mounting base plate 1. The mounting end of the filter assembly 4 is fixedly connected to the mounting base plate 1. A connecting pipe 8 connects the top of the filter assembly 4 to the pressure stabilizing tank 31. The two ends of the connecting pipe 8 are fixedly connected to the filter assembly 4 and the pressure stabilizing tank 31 respectively. The connecting pipe 8 can make the filter assembly 4 and the pressure stabilizing tank 31 in a sealed communication state. An air inlet valve 9 is installed on the connecting pipe 8. The mounting end of the air inlet valve 9 is fixedly connected to the connecting pipe 8. The air inlet valve 9 can regulate and control the gas flow rate in the connecting pipe 8. The intelligent control center 32 is electrically connected to the air inlet valve 9. The intelligent control center 32 can intelligently control the air inlet valve 9, so that it can accurately control the opening and closing of the air inlet valve 9 according to the pressure change to ensure stable negative pressure. Coarse filters are installed inside the filter assembly 4. The installation ends of the coarse filter 41 and the fine filter layer 42 are installed corresponding to the inner wall of the filter assembly 4. The coarse filter 41 and the fine filter layer 42 are fixedly connected to the filter assembly 4. The coarse filter 41 and the fine filter layer 42 divide the internal space of the filter assembly 4 into three areas. The coarse filter 41 can intercept and filter larger particles of molding sand dust. Activated carbon particles 11 are filled between the coarse filter 41 and the fine filter layer 42 inside the filter assembly 4. The activated carbon particles 11 can adsorb harmful impurities and odors in the gas. The fine filter layer 42 can filter and intercept smoke and fine dust particles. The filter assembly 4 adopts a multi-layer composite filter structure, which can efficiently remove impurities in the gas, greatly reduce the clogging and wear of impurities on equipment such as vacuum pumps, extend the service life of the equipment, and reduce maintenance costs.

[0022] A negative pressure pipe 6 is installed on the connecting pipe 5. One end of the negative pressure pipe 6 is installed correspondingly to the connecting pipe 5 and is fixedly connected to the connecting pipe 5. The negative pressure pipe 6 and the connecting pipe 5 are sealed, but also connected. A control valve is installed on the connecting pipe 5 on one side of the negative pressure pipe 6. The fine filter layer 42 is electrically connected to the control valve. The control valve can regulate the gas pressure in the negative pressure pipe 6, thereby ensuring gas pressure stability. A vacuum distribution mechanism 7 is installed on the end of the negative pressure pipe 6 away from the connecting pipe 5. The vacuum distribution mechanism 7 includes a vacuum distributor 71. A stable base 10 is provided on the mounting plate 1. The mounting end of the stable base 10 is fixedly connected to the mounting plate 1. The mounting end of the vacuum distributor 71 is installed correspondingly to the top of the stable base 10. The vacuum distributor 71 is fixedly connected to the stable base 10. One end of the negative pressure pipe 6 is installed correspondingly to the connection end of the vacuum distributor 71. The negative pressure pipe 6 and the vacuum distributor 71 are sealed together. Multiple sets of distribution pipes 72 are symmetrically arranged on the vacuum distributor 71. The mounting ends of the distribution pipes 72 are installed correspondingly to the vacuum distributor 71. 2. Fixedly connected to the vacuum distributor 71, each set of distribution pipes 72 can be assembled with a corresponding set of sand boxes. Multiple sets of distribution pipes 72 are modularly arranged. The vacuum distributor 71 can generate a negative pressure from the vacuum pump 2, which is stabilized by the pressure stabilizing component 3 and then evenly distributed to each sand box through the distribution pipes 72. This meets the requirement of compacting the molding sand in the sand box under a stable negative pressure field in the lost foam casting process. Each set of distribution pipes 72 is equipped with a flow regulating valve 73 and a vacuum degree monitor 74. The mounting ends of the flow regulating valve 73 and the vacuum degree monitor 74 are respectively installed corresponding to the distribution pipes 72. Both valve 73 and vacuum monitor 74 are fixedly connected to distribution pipe 72. The flow regulating valve 73 can regulate the gas flow rate in distribution pipe 72, and the vacuum monitor 74 can regulate and display the gas pressure in distribution pipe 72. The vacuum distribution mechanism 7 has a modular design, which can accurately control the negative pressure distribution according to different production needs, improve the pumping efficiency, and enable each sand box to be compacted and poured under a stable and appropriate negative pressure. This helps to improve the production efficiency and casting accuracy of lost foam casting and meet the needs of large-scale production.

[0023] In this embodiment, the operator first powers on the vacuum pump 2 and observes its operating status to ensure normal operation. Then, the intelligent control center 32 sequentially opens the control valve, the inlet valve 9, and the flow regulating valve 73 to gradually build up negative pressure in the system. During the process of building up negative pressure, the vacuum degree monitor 74 observes the changes in negative pressure in each sand box, and the pressure sensor 34 monitors the pressure changes in the pressure stabilizing tank and displays them on the pressure display 33 to ensure that the system pressure and the negative pressure of the sand box are within the normal range.

[0024] During the lost foam casting process, when sand box molding is required, the flow regulating valve 73 in the vacuum distribution mechanism 7 precisely adjusts the negative pressure distributed to each sand box according to the size of the sand box and the process requirements, so that the molding sand in the sand box is compacted under a stable negative pressure field. During the pouring process, the vacuum pump 2 is continuously running, and the gas generated by the vaporization of the foam model is continuously extracted through the filter component 4. At the same time, the system pressure is stabilized through the pressure stabilizing component 3 to ensure that the pouring process proceeds smoothly.

[0025] After the lost foam casting process is completed, first turn off the power to vacuum pump 2 and stop its operation. Then, turn off the control valve, inlet valve 9 and flow regulating valve 73 in sequence. Finally, after stopping the device, inspect and maintain the device, clean the impurities collected inside the filter assembly, and check whether any parts are damaged or abnormal, in order to prepare for the next use.

[0026] The above-described specific embodiments are merely preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above-described specific embodiments.

Claims

1. A vacuum negative pressure device for lost foam casting, comprising a mounting base plate (1), characterized in that: A vacuum pump (2) is installed above the mounting base plate (1). The air inlet of the vacuum pump (2) is located on the mounting base plate (1) and a pressure stabilizing component (3) is installed. A filter component (4) is installed on one side of the pressure stabilizing component (3). A coarse filter screen (41) and a fine filter layer (42) are respectively installed in the filter component (4). A connecting pipe (5) is installed between the vacuum pump (2) and the pressure stabilizing component (3). A negative pressure pipe (6) is installed on the connecting pipe (5). A vacuum distribution mechanism (7) is installed at the end of the negative pressure pipe (6) away from the connecting pipe (5). The vacuum distribution mechanism (7) includes a vacuum distributor (71). Multiple sets of distribution pipes (72) are symmetrically arranged on the vacuum distributor (71). Each set of distribution pipes (72) is equipped with a flow regulating valve (73) and a vacuum degree monitor (74).

2. The vacuum negative pressure device for lost foam casting according to claim 1, characterized in that, The mounting end of the vacuum pump (2) is installed corresponding to the upper side of the mounting base plate (1). The pressure stabilizing component (3) includes a pressure stabilizing tank (31). The mounting end of the pressure stabilizing tank (31) is installed corresponding to the upper side of the mounting base plate (1). One end of the connecting pipe (5) is installed corresponding to the air inlet of the vacuum pump (2), and the other end of the connecting pipe (5) is installed corresponding to the air outlet of the pressure stabilizing tank (31).

3. The vacuum negative pressure device for lost foam casting according to claim 2, characterized in that, An intelligent control center (32) is provided above the pressure stabilizing tank (31). A pressure display (33) and a pressure sensor (34) are also provided on one side of the intelligent control center (32) on the pressure stabilizing tank (31). The intelligent control center (32) is electrically connected to the pressure display (33) and the pressure sensor (34) respectively.

4. The lost foam casting vacuum negative pressure device according to claim 3, characterized in that, The mounting end of the filter assembly (4) is installed corresponding to the upper side of the mounting base plate (1). The mounting ends of the coarse filter screen (41) and the fine filter layer (42) are both installed corresponding to the inner wall of the filter assembly (4). Activated carbon particles (11) are filled between the coarse filter screen (41) and the fine filter layer (42) inside the filter assembly (4).

5. The lost foam casting vacuum negative pressure device according to claim 4, characterized in that, The top of the filter assembly (4) is connected to the pressure tank (31) by a connecting pipe (8), and an air inlet valve (9) is provided on the connecting pipe (8). The intelligent control center (32) is electrically connected to the air inlet valve (9).

6. The lost foam casting vacuum negative pressure device according to claim 5, characterized in that, One end of the negative pressure pipe (6) is installed corresponding to the connecting pipe (5). The negative pressure pipe (6) and the connecting pipe (5) are in communication. A control valve is provided on the connecting pipe (5) on one side of the negative pressure pipe (6). The fine filter layer (42) is electrically connected to the control valve.

7. A vacuum negative pressure device for lost foam casting according to claim 6, characterized in that, A stable base (10) is provided on the mounting base plate (1). The mounting end of the vacuum distributor (71) is installed corresponding to the top of the stable base (10). One end of the negative pressure pipe (6) is installed corresponding to the connection end of the vacuum distributor (71). The mounting end of the distribution pipe (72) is installed corresponding to the vacuum distributor (71). Each set of distribution pipes (72) can be assembled with a set of sand boxes respectively. The mounting ends of the flow regulating valve (73) and the vacuum monitor (74) are respectively installed corresponding to the distribution pipes (72).

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