Ventilation and heat uniformity structure of tungsten powder compression soft mold drying equipment

Abstract

The utility model discloses tungsten powder pressing soft mould drying equipment ventilation even heating structure belongs to powder metallurgy equipment technical field, and the structure includes vacuum powder extractor, vibration feeder, positioning plate, powder loading line, drying line, demolding line, discharge line and washing line, and the clamping device that can transfer soft membrane between each station is matched with each line top, the drying line rear side is equipped with drying box, the demolding line bottom is equipped with the ejection bottom plate and the jacks, and the discharge line bottom is equipped with the moulding transmission plate. The utility model discloses the automatic production line design of integration, has solved the low production efficiency, the problem of great labour intensity and the product quality instability of the uneven heating of soft mould in prior art, has realized the full process automation from filling to demolding cleaning, and has guaranteed the uniformity of drying process, has improved production efficiency and product pass rate significantly.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy equipment technology, and in particular to the ventilation and heat uniformity structure of tungsten powder pressing soft mold drying equipment. Background Technology

[0002] Tungsten powder pressing is an important step in powder metallurgy. A soft film is usually used as a mold to fill and initially shape the tungsten powder. After shaping, the soft film needs to go through a drying and curing process to give the internal tungsten powder blank sufficient strength for subsequent processing.

[0003] In existing production processes, the filling of tungsten powder, the transfer of soft molds, and the drying and curing are often carried out in a decentralized manner, requiring a large amount of manual intervention. This not only results in low production efficiency and high labor intensity, but also makes it easy for manual operation to lead to quality differences between batches of products, making it difficult to achieve standardized and automated continuous production.

[0004] More importantly, in the drying and curing process, traditional drying equipment often uses static heating or simple hot air direct blowing. This method is very likely to cause uneven temperature distribution inside the drying chamber, resulting in significant differences in the degree of heating of different parts of the soft film. Some areas may overheat and sinter, while other areas may underheat and not cure completely. This uneven heating directly affects the mechanical properties and dimensional accuracy of the final tungsten rod product, and in severe cases, it may even lead to product scrapping and reduce the yield.

[0005] Therefore, this utility model proposes a ventilation and heat uniformity structure for a tungsten powder pressing soft mold drying equipment to address the shortcomings of existing technologies. Utility Model Content

[0006] In view of the problems existing in the tungsten powder pressing soft mold drying equipment, such as dispersed production processes, low degree of automation, high labor intensity, and especially the problem of uneven heating of the soft mold during the drying and curing process leading to unstable product quality, this utility model aims to provide a tungsten powder pressing soft mold drying equipment with an improved structure that can realize automated continuous production and ensure uniform ventilation and heating during the drying process.

[0007] This utility model provides a ventilation and heat distribution structure for a tungsten powder pressing soft mold drying equipment, including: a vacuum powder extractor, a vibrating feeder fixedly installed at the rear of the vacuum powder extractor, a positioning plate, and a powder loading line arranged at the discharge end of the vibrating feeder; and a drying line, a demolding line, a discharge line, and a cleaning line arranged sequentially along the process flow, with a clamp above each line, a drying box fixedly installed at the rear of the drying line, a molding transfer plate fixedly installed at the bottom of the discharge line, an ejection base plate fixedly installed at the bottom of the demolding line, an ejector rod vertically sliding inside the ejection base plate, and a cleaning fixture plate fixedly installed at the bottom of the cleaning line.

[0008] The clamp is used to grasp the soft film and transfer it between the powder loading line, the drying line, the demolding line, the discharge line and the cleaning line; the drying box has a ventilated and uniformly heated space inside to heat and solidify the soft film; the push rod can pass through the ejector plate and act on the bottom of the soft film.

[0009] Furthermore, the vacuum powder extractor, the vibrating feeder, the positioning plate, the powder loading line, the drying line, the demolding line, the discharge line, the cleaning line, the clamping device, the drying box, the ejector base plate, the ejector rod, the mold forming transfer plate, and the cleaning fixture plate are combined through a preset process flow and spatial position relationship to form an automated production line, realizing continuous operation from soft film filling, drying and curing, finished product demolding to mold cleaning.

[0010] Preferably, the gripper moves via a slide rail on the middle shelf, and the lower end of the gripper is provided with a robotic gripper for grasping the soft film. The gripping end of the robotic gripper abuts against the outer wall of the soft film. By driving the gripper to move along the slide rail, the soft film can be accurately and quickly transferred between various workstations.

[0011] Preferably, the top surface of the positioning plate is provided with a groove-shaped slot, the inner wall shape of which is adapted to the bottom shape of the soft film. When the soft film is placed on the positioning plate by the clamp, the slot can limit and center the bottom of the soft film, ensuring its stability during the filling process.

[0012] Preferably, the drying chamber is provided with a ventilation and heating chamber, and the inner wall of the ventilation and heating chamber is provided with a hot air circulation fan and a guide plate. The guide plate is used to guide the hot air generated by the hot air circulation fan to the soft film located in the drying chamber, forming forced convection, thereby ensuring that the soft film is heated evenly as a whole.

[0013] Preferably, the top end of the ejector rod can pass through the ejector base plate and act directly on the bottom of the soft film. During demolding, driving the ejector rod to move upward can separate the formed tungsten rod from the soft film, achieving non-destructive and efficient automatic demolding.

[0014] Preferably, the upper surface of the molding transfer plate is a planar bearing structure, and the output end of the molding transfer plate is connected to a collection box. The molding transfer plate is used to carry and transfer the tungsten rods separated from the soft film to the collection box for collection.

[0015] Preferably, a powder storage bin is connected to the outside of the vibrating feeder. The powder storage bin is connected to the vacuum powder extractor through a conveying pipe. The vacuum powder extractor is used to transport tungsten powder from the raw material bag to the powder storage bin by vacuum suction, so as to provide a continuous and stable powder supply for the vibrating feeder.

[0016] Preferably, the cleaning line is equipped with a cleaning air shower device, which is used to clean and air shower the soft film after demolding. The cleaning fixture plate is used to place the cleaned soft film to achieve the cleaning and recycling of the mold.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problems of scattered and independent processes, low efficiency and high labor intensity in the production of tungsten powder soft molds in the prior art by integrating a vacuum powder pump, a vibrating feeder and a clamping and conveying system that runs through the entire process of powder loading, drying, demolding and cleaning. It achieves fully automated continuous production from raw material supply to soft mold filling to finished product demolding and mold cleaning, significantly improving production efficiency and reducing labor costs.

[0018] 2. This utility model solves the problem in the prior art of incomplete curing or stress defects in products caused by uneven local heating during static drying of soft molds by setting a hot air circulation fan inside the drying oven and constructing an annular ventilation duct with a guide plate fixed to the inner wall. It achieves the effect of forming a forced convection circulating heat field, eliminating drying dead corners, ensuring uniform heating of the soft film in all directions, and thus ensuring the consistency of tungsten rod curing quality.

[0019] 3. This utility model solves the problems of material spillage due to inaccurate filling alignment and difficulty in demolding after curing, which easily damages the finished tungsten rod, by setting a positioning plate with a slot adapted to the shape of the bottom of the soft film and an ejection base plate and ejector rod mechanism with automatic ejection function. It achieves the effects of accurate positioning and filling of the soft film, reducing material waste, and realizing non-destructive automatic demolding to improve the yield. Attached Figure Description

[0020] Figure 1 A three-dimensional schematic diagram of the ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment proposed in this utility model; Figure 2 This is a schematic diagram of the drying box of the tungsten powder pressing soft mold drying equipment with ventilation and uniform heating structure proposed in this utility model; Figure 3 This is a schematic diagram of the clamping device for the ventilation and heat equalization structure of the tungsten powder pressing soft mold drying equipment proposed in this utility model. Figure 4 This is a schematic diagram of the top plate of the ventilation and heat-uniforming structure of the tungsten powder pressing soft mold drying equipment proposed in this utility model.

[0021] Legend: 1. Vacuum powder extraction machine; 2. Vibrating feeder; 3. Powder loading line; 4. Clamping device; 5. Soft film; 6. Positioning plate; 7. Cleaning line; 8. Demolding line; 9. Discharge line; 10. Drying line; 11. Mold forming transfer plate; 12. Drying box; 13. Cleaning fixture plate; 14. Ejector base plate; 15. Ejector rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Example: Please refer to Figures 1 to 4 This utility model provides a ventilation and uniform heating structure for a tungsten powder pressing soft mold drying equipment, which aims to solve the problems of low automation and uneven drying heating in the production process of tungsten powder soft molds, which lead to unstable curing quality.

[0024] Please refer to Figure 1 and Figure 2As shown, the ventilation and heating structure of the tungsten powder pressing soft mold drying equipment includes a vacuum powder extractor 1. The vacuum powder extractor 1 serves as the power source for the front-end feeding system, used to draw tungsten powder raw materials from the packaging bag into the interior through vacuum suction. A vibrating feeder 2 is bolted to the rear side of the vacuum powder extractor 1. The vibrating feeder 2 receives the tungsten powder from the vacuum powder extractor 1 and uses its own vibration mechanism to uniformly and accurately convey the tungsten powder downwards. A powder loading line 3 is arranged directly below the discharge end of the vibrating feeder 2. The powder loading line 3... The support platform for the filling station is used to place the soft film 5 to be filled. To achieve automated connection of the entire process from filling to finished product output, it also includes a drying line 10, a demolding line 8, a discharge line 9, and a cleaning line 7 arranged sequentially along the process flow direction. Above the powder filling line 3, drying line 10, demolding line 8, discharge line 9, and cleaning line 7, a clamp 4 is installed, running through the entire working area. The clamp 4 is installed on the slide rail at the top of the middle shelf through a sliding fit. The clamp 4 is used for the drive machine... Under the action of the mechanism, the material moves reciprocatingly along the slide rail to grab the soft film 5 and accurately transfer it between each station. To ensure drying quality, a drying box 12 is fixedly installed at the rear of the drying line 10. The interior of the drying box 12 forms a ventilated and uniformly heated space to accommodate the soft film 5 and uniformly heat and cure it. To achieve automatic demolding after curing, an ejector plate 14 is fixedly installed at the bottom of the demolding line 8. The ejector plate 14 is used to limit the bottom of the soft film 5 after it is transferred to the position. The interior of the ejector plate 14 is vertically slidingly connected. There is an ejector rod 15, which is used to move upward under the drive of the power source to pass through the ejector base plate 14 and act on the bottom of the soft film 5 to eject the formed tungsten rod. In order to achieve orderly output of finished products, a mold forming transfer plate 11 is fixedly installed at the bottom of the discharge line 9. The mold forming transfer plate 11 is used to carry the separated tungsten rod and transport it outward. In order to achieve the recycling of the mold, a cleaning fixture plate 13 is fixedly installed at the bottom of the cleaning line 7. The cleaning fixture plate 13 is used to position and place the empty soft film 5 after demolding to facilitate subsequent cleaning operations.

[0025] To address the technical problem of tungsten powder spillage due to displacement of the soft mold during filling, the core of this embodiment's technical solution lies in the inclusion of a positioning plate 6. The positioning plate 6 is fixedly installed on the rear frame of the vacuum powder extraction machine 1 by bolt fastening. The top surface of the positioning plate 6 has a groove-shaped slot, the inner wall size of which matches the bottom contour size of the soft film 5. When the soft film 5 is placed in the slot, the inner wall of the slot directly abuts against the bottom of the outer wall of the soft film 5. The positioning plate 6 uses the slot structure to forcibly center and position the soft film 5, ensuring that the top opening of the soft film 5 is vertically aligned with the bottom discharge port of the vibrating feeder 2.

[0026] Please refer to Figure 3The core structure for automated transfer is described in detail below. The gripper 4 includes a lifting cylinder and a mechanical finger connected to the output end of the lifting cylinder. The inner side of the mechanical finger is covered with an anti-slip rubber pad. The gripping width of the mechanical finger matches the outer diameter of the soft film 5. The gripper 4 slides on the slide rail on the middle shelf through the top slider structure. Driven by the drive source, the gripper 4 reciprocates linearly along the length of the slide rail. The gripper 4 uses the opening and closing action of the mechanical finger to grab or release the soft film 5. The gripper 4 transfers the soft film 5 from the powder loading line 3 to the drying line 10, the demolding line 8, the discharge line 9, and the cleaning line 7 in sequence.

[0027] Please refer to Figure 2 The core structure for achieving uniform ventilation and heating is described in detail below. To ensure the uniform heating of the soft film 5 during the drying and curing process, the drying chamber 12 is equipped with a hot air circulation fan and a guide plate. The guide plate is fixed to the inner wall of the drying chamber 12 by welding. An annular ventilation channel is formed between the guide plate and the inner wall of the drying chamber 12. The outlet of the hot air circulation fan is directly opposite the annular ventilation channel. When the soft film 5 is located in the ventilated and uniformly heated space inside the drying chamber 12, the hot air flow generated by the hot air circulation fan flows along the annular ventilation channel under the guidance of the guide plate and evenly wraps the surface of the soft film 5. This forced convection circulation structure eliminates the temperature dead zone inside the drying chamber 12.

[0028] To ensure a continuous and stable supply of tungsten powder, a powder storage bin is fixedly connected to the outside of the vibrating feeder 2. The top inlet of the powder storage bin is sealed to the output end of the vacuum powder extractor 1 through a sealed pipe. When the vacuum powder extractor 1 starts, the negative pressure suction generated draws the tungsten powder in the outer packaging bag into the powder storage bin for temporary storage. The discharge port at the bottom of the powder storage bin is connected to the feed channel of the vibrating feeder 2. The vibrating feeder 2 uses high-frequency vibration to quantitatively transport the tungsten powder in the powder storage bin to the soft membrane 5 located on the positioning plate 6.

[0029] Based on the above embodiments, the present invention may further include the following preferred technical solutions. As a preferred embodiment, in order to achieve automated demolding of the soft film 5 after curing and ensure the integrity of the tungsten rod, please refer to... Figure 4 An ejector plate 14 is fixedly installed at the bottom of the demolding line 8. A through hole for the ejector rod 15 to pass through is opened at the center of the ejector plate 14. The bottom end of the ejector rod 15 is connected to a cylinder drive mechanism. When the cylinder drive mechanism receives the demolding command, it drives the ejector rod 15 to move vertically upward. The top end of the ejector rod 15 passes through the through hole of the ejector plate 14 and directly abuts against the bottom of the soft film 5 located on the ejector plate 14. As the ejector rod 15 continues to move upward, the formed tungsten rod is ejected upward, thereby separating it from the soft film 5.

[0030] In another preferred embodiment, in order to achieve automated collection and transfer of finished products, a molding transfer plate 11 is fixedly installed at the bottom of the discharge line 9. The upper surface of the molding transfer plate 11 is a planar bearing structure. The two sides of the molding transfer plate 11 are provided with baffles to prevent tungsten rods from rolling off. The molding transfer plate 11 is driven by a belt conveyor. The end of the belt conveyor is connected to a collection box. The separated tungsten rods are placed on the molding transfer plate 11 by the clamp 4 and move backward with the belt conveyor until they fall into the collection box to complete the collection.

[0031] In another preferred embodiment, in order to achieve the cleaning and reuse of the mold, a cleaning air shower device is provided above the interior of the cleaning line 7. The cleaning air shower device includes a high-pressure spray head and a drying nozzle. Several positioning posts for fixing the soft film 5 are arranged in an array on the cleaning fixture plate 13. When the empty soft film 5 after demolding is placed on the positioning post by the clamp 4, the high-pressure spray head sprays cleaning liquid to rinse the inner and outer walls of the soft film 5 to remove residual tungsten powder. Then the drying nozzle sprays high-pressure air to quickly dry the soft film 5. The cleaning fixture plate 13 is used to carry the cleaned soft film 5 to wait for the next production cycle.

[0032] Working principle: When the user uses the device, the vacuum powder extractor 1 starts and uses vacuum suction to transport the tungsten powder raw material in the packaging bag to the powder storage bin outside the vibrating feeder 2. Under the action of the vibration mechanism, the vibrating feeder 2 accurately feeds the powder filling line 3. At this time, the clamp 4 grabs the soft film 5 and places it in the slot of the positioning plate 6 to complete the positioning. The positioning plate 6 ensures that the opening of the soft film 5 is aligned with the discharge port of the vibrating feeder 2 through the slot structure to ensure that the tungsten powder can be accurately poured into the soft film 5. After filling is completed, the clamp 4 continues to drive the soft film 5 to complete the rubber stopper assembly and sealing verification in the powder filling line 3. Then, the clamp 4 grabs the soft film 5 through the slide rail on the middle shelf and transfers it to the drying box 12 fixedly installed at the rear of the drying line 10. In the drying box 12, the hot air flow generated by the hot air circulation fan is guided by the guide plate to form a ring-shaped circulating air in the ventilated and uniformly heated space. The circulating air evenly wraps the surface of the soft film 5 to achieve ventilated, uniformly heated drying and curing. After the soft film 5 has been cured in the drying oven 12, it is picked up again by the clamp 4 and transferred to the demolding line 8. The ejection plate 14 fixedly installed at the bottom of the demolding line 8 limits the bottom of the soft film 5. The ejector rod 15 is pushed upward under the drive of the cylinder and acts directly on the bottom of the soft film 5, thereby realizing the automatic separation of the tungsten rod and the soft film 5. The separated tungsten rod is then placed by the clamp 4 on the molding transfer plate 11 at the bottom of the discharge line 9 and transferred to the collection box by the support of the molding transfer plate 11. After demolding, the empty soft film 5 is held by the clamp 4 and sent into the cleaning line 7. The soft film 5 is cleaned by the high-pressure spray head and air-dried by the air-drying nozzle in the cleaning line 7 to remove residual tungsten powder. After cleaning, the soft film 5 is placed on the cleaning fixture plate 13 fixedly installed at the bottom of the cleaning line 7. Finally, the cleaned soft film 5 is stored and waits for recycling.

Claims

1. A ventilation and heat-dissipating structure for a tungsten powder pressing soft mold drying equipment, including a vacuum powder extractor (1), a vibrating feeder (2) fixedly installed on the rear side of the vacuum powder extractor (1) and a positioning plate (6), and a powder loading line (3) arranged at the discharge end of the vibrating feeder (2). Its features are, It also includes a drying line (10), a demolding line (8), a discharge line (9) and a cleaning line (7) arranged sequentially along the process flow. Above the powder loading line (3), the drying line (10), the demolding line (8), the discharge line (9) and the cleaning line (7) are clamps (4) that are slidably installed on the slide rail. The clamps (4) are used to grab the soft film (5) and transfer it between the lines. A drying box (12) is fixedly installed on the rear side of the drying line (10), a molding transfer plate (11) is fixedly installed on the bottom of the discharge line (9), an ejector plate (14) is fixedly installed on the bottom of the demolding line (8), an ejector rod (15) is vertically slidably fitted inside the ejector plate (14), and a cleaning fixture plate (13) is fixedly installed on the bottom of the cleaning line (7).

2. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The gripper (4) moves via the slide rail on the middle shelf. The lower end of the gripper (4) is provided with a mechanical gripper for grasping the soft membrane (5). The gripping end of the mechanical gripper abuts against the outer wall of the soft membrane (5).

3. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The top surface of the positioning plate (6) is provided with a groove-shaped slot, the inner wall shape of which is adapted to the bottom shape of the soft film (5). The positioning plate (6) is used to position the soft film (5) during the filling and transfer of tungsten powder.

4. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The drying chamber (12) is provided with a ventilation and heat equalization chamber. The inner wall of the ventilation and heat equalization chamber is provided with a hot air circulation fan and a guide plate. The guide plate is used to uniformly guide the hot air generated by the hot air circulation fan to the soft film (5) located in the drying chamber (12).

5. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The top end of the push rod (15) can pass through the ejector plate (14) and act directly on the bottom of the soft film (5) to separate the formed tungsten rod from the soft film (5).

6. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The upper surface of the forming transfer plate (11) is a planar bearing structure. The output end of the forming transfer plate (11) is connected to a receiving box. The forming transfer plate (11) is used to carry and transfer the soft film (5).

7. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The vibrating feeder (2) is connected to a powder storage bin on its outer side. The powder storage bin is connected to the vacuum powder extractor (1) through a conveying pipe. The vacuum powder extractor (1) is used to transport tungsten powder to the powder storage bin by vacuum suction.

8. The ventilation and heat distribution structure of the tungsten powder pressing soft mold drying equipment according to claim 1, characterized in that, The cleaning line (7) is equipped with a cleaning air shower device, which is used to clean and air shower the soft film (5) after demolding. The cleaning fixture plate (13) is used to place the cleaned soft film (5).

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