A metal powder injection molding apparatus including a powder preheating structure

Abstract

The application relates to the technical field of metal powder injection equipment, and discloses metal powder injection molding equipment containing a powder preheating structure, which comprises an operation main body, the operation main body comprises a rack, the inner wall bottom of the rack is fixedly connected with a supporting seat; a preheating part is located in the space surrounded by the rack as a whole, the preheating part comprises a treatment barrel, the circumferential outer surface of the treatment barrel is closely combined with the arc surface of the supporting seat, and the treatment barrel is rotationally connected in the interior of the rack through the pin shaft arranged on the circumferential outer surface. The metal powder injection molding equipment containing the powder preheating structure can effectively solve the problem that the heat transfer efficiency of hot air is limited in the prior art, heat needs a long time to penetrate into the interior for larger particles or thicker accumulated metal powder, the temperature of different positions of the metal powder surface and the interior is inconsistent, and it is difficult to realize uniform temperature distribution.

Description

Technical Field

[0001] This invention relates to the field of metal powder injection equipment technology, and more specifically to a metal powder injection molding equipment that includes a powder preheating structure. Background Technology

[0002] Metal powder injection molding technology is a new type of near-net-shape forming technology in powder metallurgy that introduces modern plastic injection molding technology into the field of powder metallurgy. It involves uniformly mixing metal powder with organic binder, granulating the powder, and then injecting it into the mold cavity in a heated and plasticized state using an injection molding machine to solidify and form the product. The binder in the preform is then removed by chemical or thermal decomposition methods, and finally, the product is obtained by sintering and densification.

[0003] Before metal powder injection, the metal powder needs to be preheated. Preheating allows the metal powder and binder to achieve better fusion at a specific temperature. Heat is generated by heating elements within an oven and transferred to the metal powder via hot air convection. The hot air circulates continuously within the oven, surrounding the metal powder from all directions, gradually increasing its temperature and thus preheating it. However, the heat transfer efficiency of hot air is limited. For larger particles or thicker deposits of metal powder, heat takes a longer time to penetrate, resulting in inconsistent temperatures across different parts of the powder and making it difficult to achieve a uniform temperature distribution. This negatively impacts the quality of the final product. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a metal powder injection molding apparatus that includes a powder preheating structure. This effectively solves the problem in existing technologies where, for larger particles or thicker deposits of metal powder, heat takes a long time to penetrate the interior, resulting in inconsistent temperatures at different locations of the metal powder and difficulty in achieving uniform temperature distribution, which in turn affects the quality of the final product.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a metal powder injection molding apparatus including a powder preheating structure, comprising:

[0008] The operating body includes a frame, and a support base is fixedly connected to the bottom of the inner wall of the frame;

[0009] The preheating section is located entirely within the space enclosed by the frame. The preheating section includes a processing barrel, and the outer circumferential surface of the processing barrel is in close contact with the arc surface of the support base. The processing barrel is rotatably connected to the inside of the frame by a pin provided on its outer circumferential surface. Heating elements are detachably installed on the outer circumferential surface of the processing barrel, and the heating elements are distributed in an array around the outer circumferential surface of the processing barrel.

[0010] The processing tank is equipped with a stirring roller for turning metal powder. An annular plate is fixedly connected to the inner wall of the processing tank. Two annular plates are symmetrically distributed on the left and right sides of the processing tank. A movable block that fits against the inner wall of the processing tank is rotatably connected to the side of the annular plate away from the support base. The movable block is connected to the inner wall of the processing tank by a strong spring at its end. A gear ring is fixedly connected to the side of the annular plate away from the support base. The stirring roller is rotatably connected to a mounting plate through a mounting shaft at its end. A gear that meshes with the gear ring is fixedly connected to the outer circumference of the mounting shaft.

[0011] Furthermore, an external telescopic unit is detachably installed inside the frame on the side away from the discharge inclined plate, and the output end of the external telescopic unit is connected to the outer circumferential surface of the processing barrel through a bushing.

[0012] Furthermore, a discharge ramp is fixedly connected to the side of the frame, and the discharge ramp is located directly below the discharge port. A feed pipe is fixedly connected to the outer circumference of the processing barrel, and the opening of the feed pipe faces upward. A discharge port is opened on the side of the processing barrel away from the feed pipe. Baffles that can be used to seal the processing barrel are respectively provided in the discharge port and the feed pipe.

[0013] Furthermore, the mounting plate is rotatably connected to the side wall of the processing tank via a rotating shaft disposed therein. An external drive unit is detachably mounted on the side of the processing tank near the feed pipe, and the output end of the external drive unit is connected to the rotating shaft near the feed pipe.

[0014] Furthermore, the stirring roller is slidably connected to a T-shaped block that fits against the inner wall of the processing tank via a groove on its outer circumference. The T-shaped block is hollow, and a pressure plate is slidably connected inside the cavity of the T-shaped block. A fixing rod is fixedly connected to the surface of the pressure plate, and the fixing rod passes through the cavity of the T-shaped block and is fixedly connected to the inner wall of the groove. A return spring is sleeved on the outer circumference of the fixing rod. The arc-shaped surfaces of the T-shaped block and the pressure plate are respectively provided with first slots. There are multiple first slots arranged in a circular array along the central axis of the T-shaped block. There are multiple second slots arranged in a linear array along the plane of the T-shaped block, and the diameter of the second slot is larger than that of the first slot.

[0015] Furthermore, the second slot includes a conical hole and a round hole, and the conical hole is connected to the round hole. The conical hole is opened at a certain angle to the plane of the T-shaped block.

[0016] Furthermore, the processing tank includes an outer tank and an inner tank, and the outer circumferential surface of the inner tank is connected to the inner wall of the outer tank by an elastic element.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] This invention features a stirring roller and a T-shaped block. As the stirring roller rotates continuously, the T-shaped block sequentially contacts the inner wall of the processing tank. Agglomerated metal powder particles enter the cavity of the block through the second slot. The pressure plate, in conjunction with the inner wall of the cavity, "squeezes" the agglomerated metal powder particles, breaking them down into smaller particles. The "broken" metal powder, aided by the centrifugal force generated by the rotation of the stirring roller, leaves the cavity along the first slot and re-enters the processing tank, preventing the metal powder from agglomerating and forming large particle piles. Simultaneously, the inner tank is struck during the rotation of the stirring roller, and the resulting vibrations inhibit the formation of new agglomerates. The metal powder particles are in a state of continuous movement and collision under vibration. This dynamic process makes it difficult for the particles to maintain close contact for a long time and form agglomerates, allowing the metal powder to maintain a good dispersion state during preheating, which is beneficial for subsequent processing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the processing tank according to an embodiment of the present invention;

[0022] Figure 3 This is an embodiment of the present invention. Figure 2 Enlarged structural diagram at point A in the middle;

[0023] Figure 4 This is a schematic diagram of the three-dimensional separation of the preheating section according to an embodiment of the present invention;

[0024] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged structural diagram at point B;

[0025] Figure 6 This is an embodiment of the present invention. Figure 4 Enlarged structural diagram at point C;

[0026] Figure 7 This is a schematic diagram of the three-dimensional separation of the stirring roller and the T-shaped block in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the internal structure of the T-shaped block according to an embodiment of the present invention;

[0028] Figure 9 This is an embodiment of the present invention. Figure 8 Enlarged structural diagram at point D.

[0029] The labels in the diagram represent: 1. Operating body; 11. Frame; 12. Preheating section; 121. Processing tank; 122. Heating element; 123. Feed pipe; 124. Discharge port; 125. Baffle; 126. Agitator roller; 1261. Mounting plate; 1262. Gear; 1263. T-block; 1264. Pressure plate; 1265. Fixing rod; 1266. Return spring; 1267. First slot; 1268. Second slot; 127. Ring plate; 1271. Movable block; 1272. Gear ring; 13. Discharge inclined plate; 14. Support base. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] The present invention will be further described below with reference to embodiments.

[0032] Example:

[0033] Please see Figures 1-9 The present invention provides a technical solution: a metal powder injection molding equipment including a powder preheating structure, comprising:

[0034] Operating body 1, which includes a frame 11, with a support base 14 fixedly connected to the bottom of the inner wall of the frame 11;

[0035] The preheating section 12 is located entirely within the space enclosed by the frame 11. The preheating section 12 includes a processing tank 121, and the outer circumferential surface of the processing tank 121 is in close contact with the arc surface of the support base 14. The processing tank 121 is rotatably connected to the inside of the frame 11 by a pin provided on its outer circumferential surface. A heating element 122 is detachably installed on the outer circumferential surface of the processing tank 121, and the heating element 122 is distributed in an array around the outer circumferential surface of the processing tank 121.

[0036] The processing tank 121 is equipped with a stirring roller 126 for turning metal powder. An annular plate 127 is fixedly connected to the inner wall of the processing tank 121. Two annular plates 127 are provided and are symmetrically distributed on the left and right sides with the processing tank 121 as the center. A movable block 1271 that fits against the inner wall of the processing tank 121 is rotatably connected to the side of the annular plate 127 away from the support base 14. The movable block 1271 is connected to the inner wall of the processing tank 121 by a strong spring at its end. A gear ring 1272 is fixedly connected to the side of the annular plate 127 away from the support base 14. The stirring roller 126 is rotatably connected to a mounting plate 1261 through a mounting shaft at its end. A gear 1262 that meshes with the gear ring 1272 is fixedly connected to the outer circumference of the mounting shaft.

[0037] An external telescopic unit is detachably installed on the side of the frame 11 away from the discharge inclined plate 13, and the output end of the external telescopic unit is connected to the outer circumferential surface of the processing barrel 121 through a bushing.

[0038] A discharge ramp 13 is fixedly connected to the side of the frame 11, and the discharge ramp 13 is located directly below the discharge port 124. A feed pipe 123 is fixedly connected to the outer circumference of the processing barrel 121, and the opening of the feed pipe 123 faces upward. A discharge port 124 is provided on the side of the processing barrel 121 away from the feed pipe 123. Baffles 125 that can be used to seal the processing barrel 121 are respectively provided in the discharge port 124 and the feed pipe 123.

[0039] Mounting plate 1261 is rotatably connected to the side wall of processing tank 121 via a rotating shaft located inside it. An external drive unit is detachably mounted on the side of processing tank 121 near feed pipe 123, and the output end of the external drive unit is connected to the rotating shaft near feed pipe 123.

[0040] The stirring roller 126 is slidably connected to a T-shaped block 1263 that fits against the inner wall of the processing tank 121 via a groove on its outer circumference. The T-shaped block 1263 is hollow, and a pressure plate 1264 is slidably connected inside the cavity of the T-shaped block 1263. A fixing rod 1265 is fixedly connected to the surface of the pressure plate 1264, and the fixing rod 1265 passes through the cavity of the T-shaped block 1263 and is fixedly connected to the inner wall of the groove. A sleeve is provided on the outer circumference of the fixing rod 1265. The return spring 1266, the T-shaped block 1263 and the pressure plate 1264 are respectively provided with first slots 1267. There are multiple first slots 1267 and they are arranged in a circular array around the central axis of the T-shaped block 1263. There are multiple second slots 1268 in the plane position of the T-shaped block 1263 and they are arranged in a linear array around the plane of the T-shaped block 1263. The diameter of the second slot 1268 is larger than that of the first slot 1267.

[0041] The second slot 1268 includes a tapered hole and a round hole, and the tapered hole is connected to the round hole. The tapered hole is opened at a certain angle to the plane of the T-shaped block 1263.

[0042] The processing tank 121 includes an outer tank and an inner tank, and the outer circumferential surface of the inner tank is connected to the inner wall of the outer tank through an elastic element.

[0043] refer to Figures 1-9 It can effectively solve the problem that the heat transfer efficiency of hot air is limited in the existing technology. For larger particles or thicker metal powders, heat takes a long time to penetrate into the interior. That is, the temperature of the surface and interior of the metal powder and different locations are inconsistent, making it difficult to achieve a uniform temperature distribution, which may affect the quality of the final product.

[0044] To overcome the aforementioned defects, this invention designs a metal powder injection molding equipment that includes a powder preheating structure.

[0045] Before preheating the metal powder:

[0046] First, the operator installs the frame 11 onto the metal powder injection machine with bolts, and aligns the discharge ramp 13 with the material cylinder on the metal powder injection machine. Then, by opening the baffle 125 on the feed pipe 123 (the baffle 125 can be opened manually, or it can be automatically opened and closed using some driving components; driving components such as stepper motors and electric push rods are preferred here, as they can improve the automation level of the equipment and reduce the workload of the operators), the operator adds the metal powder from the external storage device into the processing tank 121 through the feed pipe 123, and then closes the baffle 125.

[0047] Metal powder preheating process:

[0048] When the metal powder enters the processing barrel 121, a heating element 122 (which can be a resistance heating tube, an induction heater, etc., and can be selected by the operator according to the preheating requirements of the metal powder) is installed on the outside of the processing barrel 121 to heat the processing barrel 121, thereby increasing the temperature inside the processing barrel 121 and preheating the metal powder inside the processing barrel 121.

[0049] Since the metal powder in the processing tank 121 mainly relies on the convection of hot air within the tank to transfer heat, for thicker layers of metal powder, heat takes a long time to penetrate, resulting in a longer preheating time and affecting the preheating efficiency of the metal powder. In this case, by controlling an external drive unit, the mounting plate 1261 can rotate within the preheating tank, allowing the stirring roller 126 to rotate at a uniform speed within the tank 121. Because the gear 1262 and gear ring 1272 on the stirring roller 126 mesh with each other, the stirring roller 126 can rotate on its own axis while revolving around the processing tank 121. Combined with the T-shaped block 1263 installed on the stirring roller 126, the accumulated metal powder within the processing tank 121 can be stirred. This stirring continuously agitates the metal powder, breaking up its accumulation and allowing heat to be evenly transferred to each metal powder particle, ensuring uniform heat distribution. During injection, this prevents uneven preheating of the metal powder from affecting the dimensional accuracy of the molded parts.

[0050] The process of breaking up agglomerated metal powder:

[0051] When the stirring roller 126 rotates at a constant speed inside the processing tank 121, the gear 1262 on the stirring roller 126 and the gear ring 1272 on the ring plate 127 mesh with each other, allowing the stirring roller 126 to both revolve around the processing tank 121 and rotate on its own axis. At all times, a T-shaped block 1263 remains in contact with the inner wall of the processing tank 121. When the T-shaped block 1263 is in contact with the inner wall of the processing tank 121 (the arc surface of the T-shaped block 1263 gradually thins along its rotation direction), the T-shaped block 1263... When block 1263 just comes into contact with the inner wall of the processing barrel 121, the thickest part of the arc surface of T-shaped block 1263 comes into contact with the inner wall of the processing barrel 121 first. At this time, there will be a gap between the arc surface of T-shaped block 1263 and the inner wall of the processing barrel 121. As it rotates, the arc surface of T-shaped block 1263 gradually comes into complete contact with the inner wall of the barrel. During the contact process, the metal powder in the barrel will be compressed and the agglomerated metal powder will be dispersed. T-shaped block 1263 will move along the groove on the stirring roller 126. When the T-shaped block 1263 moves completely into the slot, the second slot 1268 on the plane of the T-shaped block 1263 is blocked. Other T-shaped blocks 1263 that are not in contact with the inner wall of the processing barrel 121 can maintain their initial position with the cooperation of the return spring 1266. That is, the T-shaped block 1263 extends out of the slot, and the second slot is fully exposed. Thus, the metal powder in the processing barrel 121 will enter the inner cavity of the T-shaped block 1263 through the second slot 1268 (the second slot 1268 adopts a combination of round hole and conical hole. The size of the round hole is larger than that of the conical hole, which can facilitate the agglomerated metal powder to enter the conical hole. In addition, the conical hole is at a certain angle to the plane of the T-shaped block 1263, ensuring that the agglomerated metal powder particles can only enter the cavity in one direction until they are "broken" by the pressure plate 1264).

[0052] As the stirring roller 126 continues to move, the T-shaped blocks 1263 will sequentially adhere to the inner wall of the processing tank 121. If the cavity of the T-shaped blocks 1263 contains agglomerated metal powder particles (metal powder particles may agglomerate due to surface energy, environmental humidity, and surface adsorption, resulting in larger "metal powder particles"), when the T-shaped blocks 1263 enter the slot completely, the pressure plate 1264 inside the cavity will "squeeze" the agglomerated metal powder particles against the inner wall of the cavity (the inner wall of the cavity uses uniformly distributed ridges and grooves, which can increase the shear force on the agglomerated metal powder and help to break up the agglomeration phenomenon between metal powders), causing the agglomerated metal powder particles to be "broken" and restored to small metal particles. The metal powder, after being "broken," will remain in the cavity of the T-shaped block 1263. Due to the transmission ratio between the gear ring 1272 and the gear 1262, the stirring roller 126 will rotate at high speed. Under the cooperation of centrifugal force, the metal powder that has been dispersed in the cavity will leave the cavity along the first slot 1267 and enter the processing tank 121 to continue preheating. The agglomerated metal powder that has not passed through the second slot 1268 and remains on the plane of the T-shaped block 1263 will be "broken" during the shrinkage of the T-shaped block 1263 due to the combined pressure of the plane at the slot and the plane of the T-shaped block 1263. By dispersing the agglomerated metal powder in the processing tank 121 in multiple ways, it is beneficial to increase the uniformity of metal powder preheating.

[0053] Meanwhile, during rotation, the mounting plate 1261 continuously presses against the movable block 1271 (the side of the mounting plate 1261 closest to the movable block 1271 is arc-shaped, and the side of the movable block 1271 that contacts the mounting plate 1261 is chamfered to ensure smooth contact and prevent motion interference). When the movable block 1271 is pressed, one end lifts, and the other end compresses the strong spring. When the mounting plate 1261 and the movable block 1271 separate, the strong spring, under its own elastic force, will cause the lifted end of the movable block 1271 to strike the inner wall of the processing tank 121 (the movable block 1271 is equipped with rubber pads and other elastic materials). The elastic element prevents direct contact and rigid collision between the movable block 1271 and the processing tank 121, thus acting as a buffer to avoid damage to the movable block 1271 and the processing tank 121 and affect their service life. This causes the inner wall of the processing tank 121 to vibrate. Since the processing tank 121 adopts a double-tank design, that is, an inner tank is nested inside an outer tank, and the inner tank and the outer tank are connected by an elastic element (the elastic element can be an elastic plate, rubber pad, etc., with rubber pad being preferred here). When the movable block 1271 strikes the inner tank, the inner tank can vibrate in conjunction with the outer tank and the elastic element, thereby causing the metal powder adhering to the inner wall of the processing tank 121 to fall back into the processing tank 121.

[0054] Metal powder preheating complete:

[0055] After the metal powder is preheated, the external drive unit stops working. Then, the external telescopic unit on the frame 11 can lift one side of the preheating barrel, so that the preheating barrel is tilted at a certain angle inside the frame 11. The baffle 125 at the discharge port 124 will be opened. At this time, the preheated metal powder will fall from the processing barrel 121 onto the discharge inclined plate 13. Along the discharge inclined plate 13, the preheated metal powder will enter the next process.

[0056] This application employs a processing tank 121, a stirring roller 126, a ring plate 127, and a T-shaped block 1263 in combination, which has the following advantages:

[0057] One advantage is that, by controlling the external drive unit, with the cooperation of gear 1262, gear ring 1272, and mounting plate 1261, the stirring roller 126 can not only revolve around the processing barrel 121, but also rotate on its own axis. The revolve of the stirring roller 126 allows it to agitate the metal powder over a large range, moving the metal powder along the inner edge and central area of ​​the processing barrel 121. The rotation of the stirring roller 126 ensures that all parts of its surface can fully contact the metal powder during rotation, pushing the metal powder from different angles and allowing the powder particles to be fully mixed even in a smaller area. The combination of revolve and rotation ensures that the metal powder is fully agitated within the processing barrel 121, ensuring uniform heat transfer between the powder particles.

[0058] Secondly, baffles 125 are installed on the discharge port 124 and the feed pipe 123. During the preheating process of the metal powder, the baffles 125 will seal the processing tank 121, thereby forming a relatively independent thermal environment, which can effectively reduce heat loss. At the same time, the sealed environment can also prevent various impurities in the external environment from entering the processing tank 121 and affecting subsequent processing. The sealed processing tank 121 can also prevent metal powder from leaking into the external environment, avoid the leakage of harmful substances contained in some metal powder, and protect the health of operators and the safety of the surrounding environment.

[0059] Thirdly, after the metal powder is preheated, the processing barrel 121 can be tilted inside the frame 11 by the external telescopic unit, so that it can form a suitable angle. Thus, the metal powder in the processing barrel 121 can automatically flow out of the processing barrel 121 and can proceed to the next process along the processing ramp. The degree of automation is high, reducing manual operation, reducing the workload of the staff, and improving their work efficiency.

[0060] Fourthly, during the rotation of the stirring roller 126, the mounting plate 1261 continuously abuts against the movable block 1271, causing one end of the movable block 1271 to lift up and the other end of the movable block 1271 to compress a strong spring. When the mounting plate 1261 and the movable block 1271 separate, the movable block 1271 intermittently strikes the inner wall of the processing tank 121. Since the processing tank 121 adopts a double-tank design, with the inner and outer tanks connected by an elastic element, when the inner tank is struck, it vibrates. The vibration generated by the striking can inhibit the formation of new agglomerates. The metal powder particles are in a state of continuous movement and collision under the vibration environment. This dynamic process makes it difficult for the particles to maintain close contact for a long time and form agglomerates. Through continuous intermittent striking, the metal powder can maintain a good dispersion state during the preheating process, which is beneficial to subsequent processing.

[0061] Fifthly, the metal powder in the processing tank 121 enters the inner cavity of the T-shaped block 1263 through the second slot 1268. As the stirring roller 126 moves continuously, the T-shaped block 1263 will successively adhere to the inner wall of the processing tank 121. If the cavity of the T-shaped block 1263 contains agglomerated metal powder particles, the pressure plate 1264 and the inner wall of the cavity will "squeeze" the agglomerated metal powder particles, causing the agglomerated metal powder particles to be "broken" and restored to small metal powder particles. The "broken" metal powder will leave the cavity along the first slot 1267 and re-enter the processing tank 121. This is beneficial for the metal powder particles to directly contact the surrounding thermal environment, and the heat can be conducted more quickly between the particles, so that the entire powder system can reach the preheating temperature more quickly, thereby improving the preheating efficiency. At the same time, the second slot 1268 adopts a combination of conical and round holes, which can prevent the agglomerated metal powder particles that have not been "broken" from flowing out of the cavity.

[0062] Advantage six: When the stirring roller 126 rotates at a constant speed in the processing tank 121, due to the transmission ratio between the gear ring 1272 and the gear 1262, the stirring roller 126 will rotate rapidly. As a result, the metal powder "broken" in the cavity of the T-shaped block 1263 will be released from the space along the first slot 1267 under the action of centrifugal force and re-enter the processing tank 121, thus avoiding too much metal powder remaining in the cavity of the T-shaped block 1263 and affecting the preheating efficiency of the metal powder.

[0063] Advantage 7: The arc surface of the T-shaped block 1263 gradually thins along its rotation direction. When the arc surface of the T-shaped block 1263 just contacts the inner wall of the processing barrel 121, the thickest part of the arc surface contacts first. At this time, there will be a large gap between the arc surface of the T-shaped block 1263 and the inner wall of the processing barrel 121. As the stirring roller 126 rotates, the arc surface of the T-shaped block 1263 will completely fit with the inner wall of the processing barrel 121. During the fitting process, the arc surface of the T-shaped block 1263 will squeeze the metal powder in the gap, thereby "breaking up" the agglomerated metal powder that has not entered the cavity of the T-shaped block 1263.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal powder injection molding apparatus comprising a powder preheating structure, characterized in that, include: The operating body (1) includes a frame (11), and a support base (14) is fixedly connected to the bottom of the inner wall of the frame (11); The preheating section (12) is located entirely within the space enclosed by the frame (11). The preheating section (12) includes a processing barrel (121), and the outer circumferential surface of the processing barrel (121) is tightly fitted with the arc surface of the support base (14). The processing barrel (121) is rotatably connected to the inside of the frame (11) by a pin provided on its outer circumferential surface. A heating element (122) is detachably installed on the outer circumferential surface of the processing barrel (121), and the heating element (122) is arrayed around the outer circumferential surface of the processing barrel (121). The processing tank (121) is equipped with a stirring roller (126) for turning metal powder. A ring plate (127) is fixedly connected to the inner wall of the processing tank (121). There are two ring plates (127) symmetrically distributed on the left and right sides with the processing tank (121) as the center. A movable block (1271) that fits against the inner wall of the processing tank (121) is rotatably connected to the side of the ring plate (127) away from the support base (14). The movable block (1271) is connected to the inner wall of the processing tank (121) by a strong spring at its end. A gear ring (1272) is fixedly connected to the side of the ring plate (127) away from the support base (14). The stirring roller (126) is rotatably connected to a mounting plate (1261) through a mounting shaft at its end. A gear (1262) that meshes with the gear ring (1272) is fixedly connected to the outer circumference of the mounting shaft.

2. The metal powder injection molding equipment including a powder preheating structure according to claim 1, characterized in that: An external telescopic unit is detachably installed on the side of the frame (11) away from the discharge inclined plate (13), and the output end of the external telescopic unit is connected to the outer circumferential surface of the processing barrel (121) through a bushing.

3. A metal powder injection molding apparatus including a powder preheating structure according to claim 1, characterized in that: A discharge ramp (13) is fixedly connected to the side of the frame (11), and the discharge ramp (13) is located directly below the discharge port (124). A feed pipe (123) is fixedly connected to the outer circumference of the processing barrel (121), and the opening of the feed pipe (123) faces upward. A discharge port (124) is provided on the side of the processing barrel (121) away from the feed pipe (123). Baffles (125) that can be used to seal the processing barrel (121) are respectively provided in the discharge port (124) and the feed pipe (123).

4. A metal powder injection molding apparatus including a powder preheating structure according to claim 1, characterized in that: The mounting plate (1261) is rotatably connected to the side wall of the processing tank (121) via a rotating shaft located inside it. An external drive unit is detachably installed on the side of the processing tank (121) near the feed pipe (123), and the output end of the external drive unit is connected to the rotating shaft near the feed pipe (123).

5. A metal powder injection molding apparatus including a powder preheating structure according to claim 1, characterized in that: The stirring roller (126) is slidably connected to a T-shaped block (1263) that fits against the inner wall of the processing tank (121) via a groove on its outer circumference. The T-shaped block (1263) is hollow, and a pressure plate (1264) is slidably connected inside the cavity of the T-shaped block (1263). A fixing rod (1265) is fixedly connected to the surface of the pressure plate (1264), and the fixing rod (1265) passes through the cavity of the T-shaped block (1263) and is fixedly connected to the inner wall of the groove. The outer circumference of the fixing rod (1265) is sleeved with a composite... The spring (1266) has a first slot (1267) on the arc-shaped surface of the T-shaped block (1263) and the pressure plate (1264). The first slot (1267) has a plurality of holes and is arranged in a circular array around the central axis of the T-shaped block (1263). The T-shaped block (1263) has a second slot (1268) on its planar position. The second slot (1268) has a plurality of holes and is arranged in a linear array around the planar surface of the T-shaped block (1263). The diameter of the second slot (1268) is larger than that of the first slot (1267).

6. A metal powder injection molding apparatus including a powder preheating structure according to claim 5, characterized in that: The second slot (1268) includes a conical hole and a round hole, and the conical hole is connected to the round hole. The conical hole is opened at a certain angle to the plane of the T-shaped block (1263).

7. A metal powder injection molding apparatus including a powder preheating structure according to claim 1, characterized in that: The processing tank (121) includes an outer tank and an inner tank, and the outer circumferential surface of the inner tank is connected to the inner wall of the outer tank by an elastic element.

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