Crushing mechanism for powder metallurgy green body

Abstract

The utility model discloses a powder metallurgy green blank crushing mechanism, which belongs to the field of metal powder processing, and comprises a grinding chamber with a feed port and a discharge port and grinding rollers symmetrically arranged in the grinding chamber and in close contact, the grinding rollers are cooperatively driven to rotate by a driving device, and the discharge port of the grinding chamber is further provided with a material receiving device. A sieve plate with the high middle and the two ends gently and downwards extending to the edge of the grinding roller is arranged below the grinding roller, elastic plates are arranged on the edges of the two sides of the sieve plate in a sliding mode, springs connected with the inner wall of the grinding chamber are connected below the elastic plates, sieve assisting wheels which rotate along with the driving device and knock the sieve plate to shake are arranged above the elastic plates, and guide faces facing the grinding roller are arranged above the elastic plates. Large-particle metallurgical green bodies which do not pass through the sieve holes can effectively roll to the elastic plates on the two sides of the sieve plate and rebound under knocking of the sieve assisting wheels and cannot be blocked by the grinding rollers, and the situation that large-particle substances are accumulated below the grinding rollers, and consequently grinding abrasion cannot fall into a collecting device through the sieve holes is avoided.

Description

Technical Field

[0001] The utility model relates to the field of metal powder processing, in particular to a powder metallurgy green embryo pulverizing mechanism. Background Art

[0002] Prior art CN218693883U- discloses a pulverizing device for metal powder processing. The invention comprises a driving motor and a grinding chamber, wherein two rotating shafts are arranged in the grinding chamber, the output end of the driving motor is fixedly connected to the rotating shaft on one side and is connected to the rotating shaft on the other side through a gear transmission member, a grinding roller is fixedly connected to the rotating shaft, and two adjacent grinding rollers are in close contact with each other, an inner wall of the grinding chamber located at the bottom of the two grinding rollers is connected with a sieve plate through a spring member, both ends of the grinding rollers are provided with auxiliary sieve wheels for driving the sieve plate to shake, and the output end of the driving motor is connected with a transport shaft through a belt transmission member, and the working principle; a pulverizing device for metal powder processing, wherein two rotating shafts are arranged in the grinding chamber, the output end of the driving motor is fixedly connected to the rotating shaft on one side and is connected to the rotating shaft on the other side through a gear transmission member, a grinding roller is fixedly connected to the rotating shaft, an inner wall of the grinding chamber located at the bottom of the two grinding rollers is connected with a sieve plate through a spring member, both ends of the grinding rollers are provided with auxiliary sieve wheels for driving the sieve plate to shake, the driving motor drives the auxiliary sieve wheel to rotate, and the extension roller on the auxiliary sieve wheel will hit the sieve plate to drive the sieve plate to shake, and the shaking sieve plate will knock the large pieces of metallurgical green embryos that have not leaked from the sieve plate back into the grinding roller. However, the sieve plate in the prior art is flat and relatively far away from the grinding roller. The large pieces of metallurgical embryos that have not passed through the sieve plate will be concentrated under the gap between the two grinding rollers, hitting the sieve plate and knocking the sieve plate metallurgical embryos away. The metallurgical embryos will be easily blocked by the grinding rollers and cannot fly back to the top of the grinding rollers for re-grinding. Utility Model Content

[0003] The utility model aims to provide a powder metallurgy green embryo pulverizing mechanism, which solves the problem that a large number of existing flat sieve plate particles are concentrated below the center line of two grinding rollers and cannot be knocked to fly above the grinding rollers.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a powder metallurgy embryo crushing mechanism, comprising a grinding chamber with a feed port and a discharge port and grinding rollers symmetrically arranged in the grinding chamber and in close contact, the grinding rollers are driven to rotate by a driving device, the discharge port of the grinding chamber is also provided with a material receiving device, a sieve plate with a middle height and two ends extending gently downward to the edge of the grinding roller is provided below the grinding roller, spring plates are slidably provided on the edges of both sides of the sieve plate, a spring connected to the inner wall of the grinding chamber is connected below the spring plate, an auxiliary sieve wheel is provided above the spring plate, which rotates with the driving device and knocks the sieve plate to vibrate, and a guide surface facing the grinding roller is provided above the spring plate.

[0005] Furthermore, the center line of the sieve plate is perpendicular to the tangent lines of the two grinding rollers.

[0006] Furthermore, a limiting platform extending toward the bottom of the screen plate is provided on one side where the spring plate and the screen plate slide.

[0007] Furthermore, the two upper inner corners of the grinding chamber are set as arc chamfers or arc plates are fixedly arranged at the two upper inner corners of the grinding chamber.

[0008] Furthermore, the two symmetrical grinding rollers and the screening wheel are rotatably connected to the grinding chamber via shafts.

[0009] Furthermore, the driving device includes a driving motor and a gear transmission component, the driving motor is fixed on one side of the grinding chamber, the gear transmission component is composed of four gears that mesh with each other, the four gears are respectively connected to the shaft of the grinding roller and the shaft of the auxiliary screening wheel, and the driving motor is connected to the shaft connected to the grinding roller.

[0010] Furthermore, the screening-aiding wheel comprises a knocking roller, on which a knocking head is rotatably provided.

[0011] Furthermore, the material receiving device includes a transport pipe and a spiral pusher blade rotatably arranged in the transport pipe.

[0012] Furthermore, the transport pipe is communicated with the discharge port of the grinding chamber and is located below the sieve plate.

[0013] Furthermore, a hopper is fixedly connected to the top of the grinding chamber, and a cover plate is slidably connected to the top of the hopper.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The present invention creatively sets the screen plate to be a structure that is high in the middle and gradually descends at both ends, and the sides of the screen plate extend to the two side edges of the two grinding rollers. At the same time, the spring plates are separately set on both sides of the screen plate, that is, outside the side edges of the two grinding rollers, so that large particles of metallurgical green embryos that have not passed through the screen holes can effectively roll onto the spring plates on both sides of the screen plate. The spring plates are located on the outside of the grinding rollers, and the rebound under the knocking of the auxiliary screen wheel will not be blocked by the grinding rollers. It also avoids the accumulation of large particles under the grinding rollers, resulting in the inability of the ground anti-wear to pass through the screen holes and fall into the collection device.

[0016] 2. At the same time, a guide surface is provided just above the spring plate to guide the material to flow back to the space between the two grinding rollers. The material that is hit by the auxiliary screen wheel and flies up can be accurately returned to the crushing area between the grinding rollers along the guide surface, further improving the re-grinding efficiency of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A patent application entitled "Crushing mechanism for powder metallurgy green embryos" includes four drawings in its specification, and the drawings of these drawings are described as follows:

[0018] Figure 1 It is a three-dimensional diagram of the crushing mechanism of the powder metallurgy green embryo;

[0019] Figure 2 This is a schematic diagram of the structure of the sieve plate as scheme one;

[0020] Figure 3 This is a schematic diagram of the structure of the sieve plate for Scheme 2;

[0021] Figure 4 This is a schematic diagram of the structure of the sieve plate in scheme three;

[0022] Figure 5 It is a schematic diagram of a structure in which the guide surface is an arc chamfer;

[0023] Figure 6 It is a schematic diagram of the internal structure of the material collecting device.

[0024] In the figure: 1-grinding chamber, 11-feeding port, 12-discharging port, 13-hopper, 14-cover plate, 2-grinding roller, 3-screen plate, 4-spring plate, 41-limiting table, 5-spring, 6-screening wheel, 61-knocking roller, 62-knocking head, 7-guide surface, 71-arc chamfer, 72-arc plate, 8-driving device, 81-driving motor, 82-gear transmission part, 9-receiving device, 91-transport pipe, 92-spiral pushing blade. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0026] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0027] like Figures 1 to 6As shown, the utility model provides a powder metallurgy green embryo pulverizing mechanism, comprising a grinding chamber 1 with a feed port 11 and a discharge port 12 and a grinding roller 2 symmetrically arranged in the grinding chamber 1 and in close contact, the grinding roller 2 is driven to rotate by a driving device 8, the discharge port 12 of the grinding chamber 1 is also provided with a receiving device 9, a sieve plate 3 with a middle height and two ends extending gently downward to the edge of the grinding roller 2 is provided below the grinding roller 2, spring plates 4 are slidably provided on the edges of both sides of the sieve plate 3, a spring 5 connected to the inner wall of the grinding chamber 1 is connected below the spring plate 4, a sieve wheel 6 that rotates with the driving device 8 and knocks the sieve plate 3 to vibrate is provided above the spring plate 4, and a guide surface 7 facing the grinding roller 2 is provided above the spring plate 4. The grinding chamber 1 is composed of a rectangular iron box and a funnel-shaped iron box. The rectangular iron box is located on the funnel-shaped iron box. Two grinding rollers 2 are symmetrically installed in the rectangular iron box through an axle rod. Both grinding rollers 2 are provided with a plurality of mutually staggered grinding teeth. A sieve plate 3 with a middle height and a gradually descending structure at both ends is provided below the two grinding rollers 2. The sieve plate 3 is also provided with sieve holes. The sieve plate 3 is installed below the grinding roller 2 through a spring 5. The spring plate 4 is an inverted L-shaped structure. The spring plates 4 are slidably arranged on both sides of the sieve plate 3. One vertical end of the L-shaped spring plate 4 slides in contact with the side of the sieve plate 3, and the other horizontal end is installed parallel to the side of the sieve plate 3. Both ends of the sieve plate 3 extend gently downward to the edge of the grinding roller 2, that is, the spring plate 4 is located outside the side of the two grinding rollers 2. At the same time, a guide surface 7 for guiding the material to flow back between the two grinding rollers 2 is provided directly above the spring plate 4.

[0028] The structure of the sieve plate 3 of the present invention includes various schemes; Figure 2-Figure 3 Shown

[0029] Scheme 1: The sieve plate 3 is an arc-shaped structure;

[0030] Scheme 2: The sieve plate 3 is an isosceles triangle;

[0031] Scheme 3: The sieve plate 3 is an isosceles trapezoid;

[0032] Working principle: the metallurgical green material can be transported to the feed port 11 of the grinding chamber 1 through a conveyor belt or an elevator. The material is put into the feed port 11 and enters the grinding area between the two grinding rollers 2. As the driving device 8 drives the grinding rollers 2 to rotate, the metallurgical green material is ground into powder. The powder will fall onto the screen plate 3 and fall into the receiving device 9 below through the sieve holes of the screen plate 3. At this time, the large particles of metallurgical green material that have not passed through the sieve holes can effectively roll down along the inclined surfaces on both sides of the screen plate 3 to the spring plates 4 on both sides of the screen plate 3, away from the two grinding rollers. In the grinding area of ​​the grinding tube, the spring plate 4 is located on the outside of the grinding roller 2, which ensures that the rebound under the knocking of the auxiliary screening wheel 6 will not be blocked by the grinding roller 2, and also avoids the accumulation of large particles under the grinding roller 2, resulting in the inability of the ground anti-wear to fall into the collection device through the sieve hole; at the same time, a guide surface 7 is provided directly above the spring plate 4 to guide the material to flow back between the two grinding rollers 2. The flying material after being knocked by the auxiliary screening wheel 6 can be accurately returned to the crushing area between the grinding rollers 2 along the guide surface 7, further improving the re-grinding efficiency of the material.

[0033] In order to ensure that the large particles of metallurgical green embryos that have not passed through the sieve holes can slide evenly to both sides of the sieve plate 3 , the center line of the sieve plate 3 is perpendicular to the tangent lines of the two grinding rollers 2 .

[0034] like Figure 1 As shown, in order to prevent large-particle metallurgical green embryos from accumulating in the middle or on both sides of the sieve plate 3, a limit platform 41 perpendicular to the vertical side of the spring plate 4 is provided on one side where the L-shaped spring plate 4 slides with the side edge of the sieve plate 3. When the auxiliary screen wheel 6 strikes the spring plate 4 and rebounds, the spring 5 will jump up and down, and at the same time drive the limit platform 41 located below the sieve plate 3 to strike the sieve plate 3, so that the sieve plate 3 vibrates. The vibration can make the large-particle metallurgical green embryos accumulated in the middle or on both sides of the sieve plate 3 slide down, thereby solving the problem that the large-particle metallurgical green embryos accumulate in the middle or on both sides of the sieve plate 3 and the powder cannot pass through the sieve holes.

[0035] like Figure 2 and Figure 5 As shown, in order to distinguish large-particle metallurgical green embryos that rebound on the spring plate 4 and accurately return to the grinding area between the grinding rollers 2, in a first solution, arc chamfers 71 are provided at the two upper inner corners of the grinding chamber 1, and the bounced metallurgical green embryos will slide into the grinding area along the arc chamfers 71; in a second solution, arc plates 72 are installed at the positions of the two upper inner corners of the grinding chamber 1, and the arc plates 72 also play the role of guiding the metallurgical green embryos to slide into the grinding area along the arc chamfers 71, thereby further improving the re-grinding efficiency of the material.

[0036] Again, the two grinding rollers 2 and the two auxiliary screening wheels 6 of the utility model are respectively installed on the grinding chamber 1 through the shaft, and the driving device 8 includes a driving motor 81 and a gear transmission member 82. The driving motor 81 is fixed to one side of the grinding chamber 1 through a support plate and screws. The gear transmission member 82 is composed of four gears that mesh with each other. The four gears are respectively connected to the shaft of the grinding roller 2 and the shaft of the auxiliary screening wheel 6. The driving motor 81 is connected to the shaft connected to the grinding roller 2. The operation of the driving motor 81 drives the entire gear transmission member 82 to rotate synchronously, so that the grinding of the metallurgical green embryo is completed through the grinding roller 2 and the auxiliary screening wheel 6 is driven to rotate and knock the spring plate 4.

[0037] like Figure 2 As shown, a plurality of outwardly extending knocking rollers 61 are provided on the circumferential surface of the auxiliary screening wheel 6, a plurality of slots are provided at the front end of the knocking roller 61, and a connecting rod passes through all the slots. The knocking head 62 is a rubber roller, which is installed in the slot and is rotatably connected to the connecting rod. When the auxiliary screening wheel 6 rotates, the knocking roller 61 is driven to rotate, and the knocking head 62 located on the rotating knocking roller 61 will knock on the spring plate 4, causing the spring plate 4 to rebound repeatedly. By arranging a plurality of slotted knocking rollers 61 on the circumferential surface of the auxiliary screening wheel 6, and assembling rubber rollers as knocking heads 62, a continuous and gentle knocking effect on the spring plate 4 is achieved. It can not only effectively promote the large-particle metallurgical green embryos to be repeatedly knocked back from the spring plate 4 to the grinding area, thereby improving the recycling rate of the materials, but also ensure the efficient implementation of the screening process, reduce the residence time of large-particle materials in the grinding system, and improve the overall crushing efficiency; the use of a rubber roller as the knocking head 62 significantly reduces the noise level during the knocking process compared to hard materials. The use of the rubber roller not only reduces the impact and wear on the spring plate 4 and other components during the knocking process, but its low friction characteristics effectively reduce the mechanical loss of the auxiliary screening wheel 6 and the knocking system, thereby improving the durability and service life of the entire crushing mechanism.

[0038] like Figure 6 As shown, in order to quickly collect the ground metallurgical powder, the collecting device 9 connected to the discharge port 12 of the grinding chamber 1 includes a transport pipe 91 and a spiral pusher blade 92 rotatably arranged in the transport pipe 91. The transport pipe 91 is a hollow cylinder installed under the grinding chamber 1 through a support plate. The spiral pusher blade 92 is composed of an axial rod and a spiral welded or wound on the axial rod to form a spiral shape of the blade. The axial rod portion of the spiral pusher blade 92 extends out of the transport pipe 91, and a driving wheel is installed at the extended position, and the drive is connected to the output shaft of the driving motor 81 through a belt.

[0039] Working principle: An opening is opened on the transport pipe 91 and connected to the discharge port 12. The powder ground from the grinding chamber 1 will directly fall into the transport pipe 91 through the discharge port 12. The traction drive wheel is driven by the drive motor 81 to rotate, and the spiral pusher blade 92 is driven to rotate. The rotating spiral pusher blade 92 will push the powder from the transport pipe 91 to the discharge port 12 of the conveying pipe. The continuous rotation of the spiral pusher blade 92 not only ensures the continuity of the powder flow, but also increases the transmission speed, avoiding the accumulation or blockage of the powder during the transmission process. In addition, the directly connected collecting device 9 can collect the finished powder in real time, shorten the material processing time, and improve the overall work efficiency.

[0040] like Figure 6 As shown, in order to facilitate the transportation of metallurgical green embryos into the grinding chamber 1, an inverted trapezoidal feed hopper 13 is fixedly connected to the top of the grinding chamber 1, and a cover plate 14 is slidably connected to the top of the feed hopper 13. The design of the inverted trapezoidal feed hopper 13 is conducive to the natural sliding of the metallurgical green embryos, reducing the need for manual intervention, reducing the difficulty of operation and safety risks. At the same time, the sliding connection of the cover plate 14 facilitates daily cleaning and inspection, making equipment maintenance simpler and faster, extending the service life of the equipment, and reducing maintenance costs.

[0041] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A powder metallurgy green embryo pulverizing mechanism, comprising a grinding chamber with a feed inlet and a discharge outlet and grinding rollers symmetrically arranged in the grinding chamber and in close contact, the grinding rollers being driven to rotate by a driving device, and the discharge outlet of the grinding chamber is also provided with a receiving device, characterized in that: A sieve plate is provided below the grinding roller, which is high in the middle and extends gently downward to the edge of the grinding roller at both ends. Spring plates are slidably provided on the edges of both sides of the sieve plate. A spring connected to the inner wall of the grinding chamber is provided below the spring plate. An auxiliary sieve wheel is provided above the spring plate, which rotates with the driving device and strikes the sieve plate to make it shake. A guide surface facing the grinding roller is provided directly above the spring plate.

2. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The center line of the screen plate is perpendicular to the tangent lines of the two grinding rollers.

3. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; A limiting platform extending toward the bottom of the screen plate is provided on one side where the spring plate slides with the screen plate.

4. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The two upper inner corners of the grinding chamber are set as arc chamfers or arc plates are fixedly arranged at the two upper inner corners of the grinding chamber.

5. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The two symmetrical grinding rollers and the screening aid wheel are rotatably connected to the grinding chamber via shafts.

6. The powder metallurgy green body pulverizing mechanism according to claim 5, characterized in that; The driving device includes a driving motor and a gear transmission member. The driving motor is fixed on one side of the grinding chamber. The gear transmission member is composed of four gears that mesh with each other. The four gears are respectively connected to the shaft of the grinding roller and the shaft of the auxiliary screening wheel. The driving motor is connected to the shaft connected to the grinding roller.

7. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The screening-aiding wheel comprises a knocking roller, on which a knocking head is rotatably provided.

8. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The material receiving device comprises a transport pipe and a spiral material pushing blade in the transport pipe which is driven to rotate by a driving motor, and the spiral material pushing blade is rotatably arranged in the transport pipe.

9. The powder metallurgy green body pulverizing mechanism according to claim 8, characterized in that; The transport pipe is communicated with the discharge port of the grinding chamber and is located below the sieve plate.

10. The powder metallurgy green body pulverizing mechanism according to claim 1, characterized in that; The top of the grinding chamber is fixedly connected with a feeding hopper, and the top of the feeding hopper is slidably connected with a cover plate.

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