High-precision flow control valve for metal powder and using method of high-precision flow control valve

Abstract

The invention belongs to the technical field of metal powder flow control, and particularly relates to a high-precision flow control valve for metal powder and a using method of the high-precision flow control valve. According to the high-precision flow control valve, by means of a precise structure that the driving gear and the driven gear are meshed with each other, metal powder is finely controlled through tooth gaps, the valve can accurately match the corresponding flow in real time according to actual requirements, the metal powder is evenly and compactly filled in the sheath, and the service life of the valve is prolonged. Product defects caused by non-uniform powder filling are greatly reduced, the physical performance and mechanical strength of powder metallurgy parts are improved, the size precision of finished products is easier to reach the standard, and the rejection rate is remarkably reduced. Through a real-time feedback adjusting mechanism of the powder bearing plate and the force-electricity converter, the metal powder flow always tends to a set constant value; compared with a traditional control means, the method does not depend on artificial experience judgment and afterward adjustment any more, flow fluctuation in the production process can be rapidly responded, the process stability can be maintained, and smooth continuous production is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of metal powder flow control, and in particular relates to a high-precision flow control valve for metal powder and a use method thereof. Background Art

[0002] In the crucial industrial field of powder metallurgy, metal powder occupies a core position and has extremely wide applications. From a macroscopic perspective, metal powder exhibits fluid-like properties and has a certain degree of fluidity. This fluidity is particularly important in pre-treatment processes such as metal powder screening and electrostatic impurity removal, because these processes require precise control of the flow rate of metal powder to ensure the quality and performance of subsequent powder metallurgy parts.

[0003] Especially in the production process of powder metallurgy parts, the fluidity of metal powder is fully utilized in the filling process. Especially in the hot isostatic pressing package filling process, the precise control of metal powder flow rate becomes one of the key factors determining product quality. The hot isostatic pressing process has extremely high requirements for the filling density of metal powder inside the package. Only by accurately matching the appropriate powder flow rate at each stage of package filling can the metal powder be ensured to be evenly and densely filled in the package.

[0004] However, the current existing technical means have obvious deficiencies in metal powder flow control, and it is difficult to achieve effective control of metal powder flow. Therefore, a new solution is urgently needed to fill this technical gap and improve the level and accuracy of metal powder flow control.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to overcome the above-mentioned shortcomings of the prior art and to provide a high-precision flow control valve for metal powder and a method for using the same.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In one aspect, the present invention provides a high-precision flow control valve for metal powder, comprising a valve body, wherein a KF interface (KF vacuum flange interface) is provided on the upper portion of the valve body;

[0009] A cavity is provided in the middle part for accommodating a driving gear and a driven gear, the driving gear and the driven gear are meshed with each other, and the flow rate of the metal powder is controlled by the tooth gap. A servo motor for driving the driving gear to rotate is also fixed outside the valve body, and the rotating shafts of the driving gear and the driven gear are both rotationally fixed to the valve body;

[0010] The lower part is a tube body, and a powder receiving plate is provided on the side wall of the tube body. One end of the powder receiving plate extends into the tube body and is used to receive metal powder falling from the gear gap. The middle part is hinged with the side wall of the tube body, and the other end is connected to a force-electric converter for detecting the weight of metal powder falling on the powder receiving plate per unit time. A gap is left between the end of the powder receiving plate extending into the tube body and the tube body to facilitate the falling of metal powder.

[0011] The servo motor is electrically connected to the force-to-electricity converter.

[0012] Specifically, the powder receiving plate is connected to the electromechanical converter via a strain spring.

[0013] Specifically, a rectangular hole for arranging a powder receiving plate is formed on the side wall of the tube body, and a rotating shaft for hingedly connecting the powder receiving plate is formed on a side of the rectangular hole away from the cavity.

[0014] Specifically, one end of the powder receiving plate away from the tube body is a folded edge structure bent toward the cavity.

[0015] Specifically, in the valve body, the connection between the cavity and the tube body is a conical structure that facilitates the flow of metal powder.

[0016] Specifically, the servo motor is connected to the force-electricity converter via a wire.

[0017] Specifically, a sealing gasket is provided between the driving gear, the driven gear and the inner wall of the valve body to prevent leakage of metal powder, and the shape of the sealing gasket is adapted to the shape of the cavity; further, the sealing gasket is made of silicone.

[0018] In another aspect, the present invention provides a method for using the high-precision flow control valve for metal powder as described above, which is specifically as follows:

[0019] First, the metal powder enters the valve body through the KF interface and fills the upper cavity of the valve body. The servo motor drives the driving gear to rotate clockwise at a specific speed, and the corresponding driven gear rotates counterclockwise under the meshing action, thereby quantitatively transporting the metal powder in the upper cavity of the valve body to the tube of the valve body; then the metal powder enters the tube of the valve body and falls on the powder receiving plate;

[0020] If the metal powder falling onto the powder receiving plate per unit time is consistent with the set powder flow rate, the electromechanical converter will not work and the servo motor speed will not change;

[0021] If the metal powder falling onto the powder receiving plate per unit time is lower than the set powder flow rate, the force-electric converter transmits a signal of reduced force to the servo motor, and the servo motor increases the speed through the control system, thereby increasing the speed of the driving gear and the driven gear, and controlling the powder flow rate to increase to the set value; vice versa;

[0022] The flow rate of metal powder can be adjusted to be constant by adjusting the speed of the servo motor in real time.

[0023] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0024] The high-precision flow control valve of the present invention, relying on the precise structure of the mutual meshing of the driving gear and the driven gear, utilizes the tooth gap to perform fine control on the metal powder. The valve can accurately match the appropriate flow rate in real time according to actual needs, so that the metal powder is evenly and densely filled in the package, greatly reducing product defects caused by uneven powder filling, improving the physical properties and mechanical strength of powder metallurgy parts, making it easier for the finished product size accuracy to meet the standards, and significantly reducing the scrap rate.

[0025] Through the ingenious design of the powder receiving plate and the electromechanical converter, the valve is endowed with the ability to monitor the metal powder flow in real time; this closed-loop real-time feedback adjustment mechanism allows the metal powder flow to always approach the set constant value; compared with traditional control methods, it no longer relies on manual experience judgment and subsequent adjustments, and can quickly respond to flow fluctuations in the production process, maintain process stability, and ensure smooth continuous production.

[0026] The high-precision flow control valve of the present invention has good compatibility, provides accurate flow control solutions for powder metallurgy production of different scales and different process requirements, and accelerates the promotion and application of new technologies and new processes in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the operating principle of the present invention.

[0031] Among them: 1 is a valve body; 2 is a driving gear; 3 is a driven gear; 4 is a powder receiving plate; 5 is a strain spring; 6 is a force-electric converter; 7 is a servo motor; 8 is metal powder; 9 is a rotating shaft; and 10 is a wire. DETAILED DESCRIPTION

[0032] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention as detailed in the appended claims.

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] Example

[0035] See also Figure 1-2 As shown, this embodiment provides a high-precision flow control valve for metal powder, comprising a valve body 1, wherein a KF interface is provided on the upper portion of the valve body 1, and the KF interface is used to connect a powder storage device;

[0036] A cavity for accommodating a driving gear 2 and a driven gear 3 is provided in the middle. The driving gear 2 and the driven gear 3 mesh with each other and use the tooth gap to control the flow rate of the metal powder 8. A servo motor 7 for driving the driving gear 2 to rotate is also fixed outside the valve body 1. The rotating shafts of the driving gear 2 and the driven gear 3 are both rotationally fixed to the valve body 1.

[0037] The lower part is a tube body, and a powder receiving plate 4 is provided on the side wall of the tube body. One end of the powder receiving plate 4 extends into the tube body and is used to receive the metal powder 8 falling from the gear gap. The middle part is hinged with the side wall of the tube body, and the other end is connected with a force-electric converter 6 for detecting the weight of the metal powder 8 falling on the powder receiving plate 4 per unit time. A gap is left between the end of the powder receiving plate 4 extending into the tube body and the tube body to facilitate the falling of the metal powder 8. The lower end of the tube body is used to connect the powder using equipment.

[0038] The servo motor 7 is electrically connected to the power-to-electric converter 6 .

[0039] Specifically, the powder receiving plate 4 is connected to the electromechanical converter 6 via a strain spring 5 .

[0040] Specifically, a rectangular hole for setting the powder receiving plate 4 is opened on the side wall of the tube body, and a rotating shaft 9 for hingedly connecting the powder receiving plate 4 is provided on the side of the rectangular hole away from the cavity.

[0041] Specifically, one end of the powder receiving plate 4 away from the tube body is a folded edge structure bent toward the cavity.

[0042] Specifically, in the valve body 1 , the connection between the cavity and the tube body is a conical structure that facilitates the flow of the metal powder 8 .

[0043] Specifically, the servo motor 7 is connected to the power-to-electric converter 6 via a wire 10 .

[0044] Specifically, a sealing gasket is provided between the driving gear 2, the driven gear 3 and the inner wall of the valve body 1 to prevent the metal powder 8 from leaking out, and the shape of the sealing gasket is adapted to the shape of the cavity; further, the sealing gasket is made of silicone.

[0045] In another aspect, the present invention provides a method for using the high-precision flow control valve for metal powder as described above, which is specifically as follows:

[0046] First, the metal powder 8 enters the valve body 1 through the KF interface and fills the upper cavity of the valve body 1. The servo motor 7 drives the driving gear 2 to rotate clockwise at a specific speed, and the corresponding driven gear 3 rotates counterclockwise under the meshing action, thereby quantitatively transporting the metal powder 8 in the upper cavity of the valve body 1 to the tube body of the valve body 1; then, after the metal powder 8 enters the tube body of the valve body 1, it falls on the powder receiving plate 4;

[0047] If the metal powder 8 falling onto the powder receiving plate 4 per unit time is consistent with the set powder flow rate, the strain spring 5 does not act, the force-electric converter 6 does not act, and the speed of the servo motor 7 does not change;

[0048] If the metal powder 8 in the upper cavity of the valve body 1 is too little or the gear is subjected to friction and the rotation speed is reduced, and the metal powder 8 falling on the powder receiving plate 4 per unit time is lower than the set powder flow rate, the strain spring 5 will contract, and the force-electric converter 6 will transmit the signal of reduced force to the servo motor 7. The servo motor 7 increases the rotation speed through the control system, thereby increasing the rotation speed of the driving gear 2 and the driven gear 3, and controlling the powder flow rate to increase to the set value;

[0049] If the powder in the upper cavity of the valve body 1 is denser and the gear speed does not change, the metal powder 8 falling onto the powder plate 4 per unit time will be higher than the set powder flow rate, then the strain spring 5 will stretch, and the force-electric converter 6 will transmit the signal of increased force to the servo motor 7. The servo motor 7 will reduce the speed through the control system setting, thereby reducing the speed of the driving gear 2 and the driven gear 3, and controlling the powder flow rate to be reduced to the set value.

[0050] By adjusting the rotation speed of the servo motor 7 in real time, the flow rate of the metal powder 8 is adjusted to be constant, thereby meeting the precise control of the flow rate of the metal powder 8 .

[0051] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0052] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A high-precision flow control valve for metal powder, characterized in that: It comprises a valve body (1), wherein the upper part of the valve body (1) is provided with a KF interface; A cavity is provided in the middle for accommodating a driving gear (2) and a driven gear (3), the driving gear (2) and the driven gear (3) mesh with each other and use the tooth gap to control the flow rate of the metal powder (8), and a servo motor (7) is fixedly provided outside the valve body (1) for driving the driving gear (2) to rotate, and the rotating shafts of the driving gear (2) and the driven gear (3) are both rotationally fixed to the valve body (1); The lower part is a tube body, and a powder receiving plate (4) is provided on the side wall of the tube body. One end of the powder receiving plate (4) extends into the tube body, the middle part is hinged to the side wall of the tube body, and the other end is connected to a force-electric converter (6) for detecting the weight of metal powder (8) falling on the powder receiving plate (4) per unit time; a gap is left between the end of the powder receiving plate (4) extending into the tube body and the tube body to facilitate the falling of the metal powder (8); The servo motor (7) is electrically connected to the power-electric converter (6).

2. The high-precision flow control valve for metal powder according to claim 1, characterized in that: The powder receiving plate (4) is connected to the electromechanical converter (6) via a strain spring (5).

3. The high-precision flow control valve for metal powder according to claim 1, characterized in that: A rectangular hole for arranging a powder receiving plate (4) is provided on the side wall of the tube body, and a rotating shaft (9) for hingedly connecting the powder receiving plate (4) is provided on the side of the rectangular hole away from the cavity.

4. The high-precision flow control valve for metal powder according to claim 1, characterized in that: One end of the powder receiving plate (4) away from the tube body is a folded edge structure bent towards the cavity.

5. The high-precision flow control valve for metal powder according to claim 1, characterized in that: In the valve body (1), the connection between the cavity and the tube body is a conical structure that facilitates the flow of metal powder (8).

6. The high-precision flow control valve for metal powder according to claim 1, characterized in that: The servo motor (7) is connected to the power-electric converter (6) via a wire (10).

7. The high-precision flow control valve for metal powder according to claim 1, characterized in that: A sealing gasket is provided between the driving gear (2), the driven gear (3) and the inner wall of the valve body (1) to prevent the metal powder (8) from leaking out, and the shape of the sealing gasket matches the shape of the cavity.

8. The high-precision flow control valve for metal powder according to claim 7, characterized in that: The sealing pad is made of silicone.

9. A method for using a high-precision flow control valve for metal powder according to any one of claims 1 to 8, characterized in that: The details are as follows: First, the metal powder (8) enters the interior of the valve body (1) through the KF interface and fills the upper cavity of the valve body (1). The servo motor (7) drives the driving gear (2) to rotate clockwise at a specific speed, and the corresponding driven gear (3) rotates counterclockwise under the meshing action, thereby quantitatively transporting the metal powder (8) in the upper cavity of the valve body (1) to the tube body of the valve body (1); then, after the metal powder (8) enters the tube body of the valve body (1), it falls on the powder receiving plate (4); If the amount of metal powder (8) that falls onto the powder receiving plate (4) per unit time is consistent with the set powder flow rate, the electromechanical converter (6) does not operate and the speed of the servo motor (7) remains unchanged; If the amount of metal powder (8) falling onto the powder receiving plate (4) per unit time is lower than the set powder flow rate, the force-electric converter (6) transmits a signal indicating a force reduction to the servo motor (7), and the servo motor (7) increases the rotation speed through the control system, thereby increasing the rotation speeds of the driving gear (2) and the driven gear (3), and controlling the powder flow rate to increase to the set value; and vice versa; The flow rate of the metal powder (8) is adjusted to be constant by regulating the rotation speed of the servo motor (7) in real time.

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