Compression molding device for real gold pressed powder

Abstract

The invention belongs to the technical field of true gold powder compression molding equipment, and particularly relates to a true gold powder compression molding device which comprises a supporting table, a fixing frame is fixedly connected to the edge of the upper surface of the supporting table, an adjusting cylinder is fixedly connected to the inner wall of a mounting hole of the fixing frame, and a mold pressure adjusting mechanism is fixedly connected to the wall of the fixing hole of the adjusting cylinder. The compression molding device not only has the functions of automatic quantification and layer-by-layer automatic compression molding of the real gold pressed powder, but also has the heating auxiliary compression molding capability, so that the stress uniformity of the real gold pressed powder during compression molding is effectively improved, the compression molding processing efficiency and the qualification rate of the real gold powder are improved, and the production cost is reduced. In addition, the compression molding device can adaptively adjust the compression molding die pressure according to the particle size of the real gold powder, the situation that irreversible caking occurs during compression molding of the real gold powder is avoided, and the use reliability of the compression molding device for the real gold powder cakes is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of real gold powder die forming equipment, in particular to a real gold powder cake die forming device. BACKGROUND

[0002] Real gold powder is a high-purity gold powder made of leftover materials from gold wire or foil production through special grinding process. In application scenarios, real gold powder exhibits multiple values. In the field of calligraphy and painting, it can be used for gold calligraphy and Chinese painting, giving works a luxurious texture. In handicraft processing, it is suitable for traditional techniques such as gold lacquer wood carving, gold lacquer, and gold paste, highlighting the noble style of objects. It also plays a key role in the fields of Thangka making, scripture copying, Buddha statue gilding, and cultural heritage restoration, and restores cultural heritage styles with unique gold texture and weight.

[0003] Currently, when real gold powder exists in powder state after grinding, its high specific surface area characteristics cause it to easily scatter due to air flow disturbance, container vibration, etc. during production and transportation, not only causing waste of valuable raw materials, but also affecting production environment safety due to powder diffusion. Therefore, it is necessary to use die forming equipment to make real gold powder into stable structure real gold powder cakes. The real gold powder cakes after die forming not only can significantly improve the structural stability during storage and transportation, reducing transportation loss, but also can achieve precise quantity control through quantitative die forming, and can restore powder state after simple grinding and dispersion, fully retaining the use characteristics of real gold powder.

[0004] Currently, during real gold powder die forming process, workers need to manually weigh real gold powder and pour it into the die forming cavity. As high-value raw materials, real gold powder requires high measurement accuracy. Manual weighing is not only tedious, time-consuming and labor-intensive, but also difficult to adapt to batch production requirements. It is more likely to cause single feeding quantity fluctuation due to human operation errors (such as weighing tool calibration deviation, visual reading error, etc.). When the error exceeds the allowed range, it not only directly affects the forming density and specification consistency of real gold powder cakes, but also may affect the pass rate of real gold powder cake die forming due to excess or insufficient raw materials, and also affects the efficiency of real gold powder cake die forming.

[0005] In addition, there is natural friction resistance between real gold powder particles, and the amount of powder in the die cavity is large during die pressing, and the powder is easy to form local accumulation under the action of gravity, causing the "bridge effect" (particles support each other to form a gap). The existing equipment usually adopts a single whole pressing mode, and the die pressing force is easy to attenuate during transmission, that is, the real gold powder at the edge of the die cavity is first pressed and quickly compacted, while the real gold powder at the center of the die cavity cannot obtain sufficient pressure due to the blockage of the outside resistance, resulting in insufficient compaction. At the same time, the real gold powder needs to avoid irreversible bonding (clumping) between particles caused by excessive die pressing force, which requires the die pressing force to be strictly controlled in a safe range, further aggravating the problem of insufficient internal compaction. The formed real gold powder cake presents the structural defect of "dense outside and loose inside", and then the real gold powder cake is easy to crumble when subjected to jolt impact in the conveying belt transfer scene, not only causing secondary scattering and waste of real gold powder, causing economic loss, but also affecting the quality of the die pressing of the real gold powder cake, and reducing the long-term use reliability of the die pressing equipment.

[0006] To this end, we propose a die pressing forming device for real gold powder cakes to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a die pressing forming device for real gold powder cakes to solve the above problems.

[0008] To achieve the above purpose, the following technical scheme is adopted: a die pressing forming device for real gold powder cakes, comprising a support table, a fixed frame is fixedly connected to the upper surface edge of the support table, an adjusting cylinder is fixedly connected to the inner wall of the mounting hole of the fixed frame, and a die pressing force adjusting mechanism is fixedly connected to the fixed hole wall of the adjusting cylinder;

[0009] The inner wall of the side end movable hole of the adjusting cylinder is movably connected with a moving rod, one end of the moving rod inside the adjusting cylinder is fixedly connected with a sealing piston movably connected with the inner wall of the adjusting cylinder, and the outer end of the moving rod is fixedly connected with a plugging block, and the connecting end of the plugging block is movably sleeved with a die pressing metal cylinder;

[0010] The upper surface of the die pressing metal cylinder is fixedly connected with an L-shaped plate, the top end of the L-shaped plate is fixedly embedded with a transparent hopper, the top end of the transparent hopper is fixedly connected with an elastic rubber sealing cover, the bottom end of the transparent hopper is fixedly connected with a quantitative mechanism, and the bottom end of the quantitative mechanism passes through the top end of the die pressing metal cylinder and is fixedly communicated with the die pressing cavity of the die pressing metal cylinder;

[0011] The inner wall of the die pressing metal cylinder is movably connected with a die pressing mechanism, and the bottom end of the die pressing metal cylinder is fixedly connected with a die pressing auxiliary mechanism.

[0012] In the above-mentioned die forming device of real gold powder cake, the die pressure adjusting mechanism comprises a first electric push rod fixedly embedded at the side end of the adjusting cylinder, a first support plate is fixedly connected to the moving end of the first electric push rod, a first sealing ring is fixedly connected to the outer wall of the first support plate, a connecting hole one and a connecting hole two are formed in the outer wall of the first support plate, the hole wall of the connecting hole one is fixedly connected with a gas pressure sensor, the hole wall of the connecting hole two is fixedly connected with a fixed ring, and the inner wall of the fixed ring is fixedly connected with a normally open electromagnetic valve.

[0013] In the above-mentioned die forming device of real gold powder cake, the quantitative mechanism comprises an annular housing fixedly communicated with the discharge end of the transparent hopper, a guide hopper is fixedly communicated with the bottom end of the annular housing, the bottom end of the guide hopper passes through the top end of the die metal cylinder and is fixedly communicated with the die cavity of the die metal cylinder, connecting bearings are fixedly connected to the outer walls of both sides of the annular housing, a rotating rod is fixedly connected to the inner walls of the two connecting bearings, a rotating circular block is fixedly sleeved to the rod wall of the rotating rod, three quantitative material grooves are uniformly formed in the outer wall of the rotating circular block, a sealing rubber film layer is fixedly sleeved to the outer wall of the rotating circular block and in contact with the inner wall of the annular housing, a servo motor is fixedly connected to the outer wall of the annular housing, and the driving end of the servo motor is fixedly connected with the side end of the rotating rod.

[0014] In the above-mentioned die forming device of real gold powder cake, the die forming device comprises a die forming cylinder movably connected with the inner wall of the die metal cylinder, a horizontal rod is fixedly connected to the inner wall of the die forming cylinder, a plurality of air holes are formed in the outer wall of the die forming cylinder, and ceramic air-permeable filter blocks are fixedly connected to the hole walls of the air holes.

[0015] In the above-mentioned die forming device of real gold powder cake, the die pressing auxiliary mechanism comprises a rectangular heat insulation box fixedly connected with the outer wall of the bottom end of the die pressing metal cylinder, the bottom end of the rectangular heat insulation box is fixedly connected with the upper surface of the support table, the top end of the rectangular heat insulation box is fixedly communicated with a first air outlet one-way valve and a first air inlet one-way valve, the inside of the die pressing metal cylinder is provided with an annular cavity, the top end of the first air outlet one-way valve and the first air inlet one-way valve is fixedly communicated with the annular cavity in the inside of the die pressing metal cylinder, the inner wall of the rectangular heat insulation box is sealingly movably connected with a second sealing ring, the inner wall of the second sealing ring is fixedly connected with a second support plate, the outer wall of the second support plate is provided with a connecting hole three, and the hole wall of the connecting hole three is fixedly connected with a second air outlet one-way valve, the outer wall of the rectangular heat insulation box is fixedly embedded with a sealing shaft sleeve, the inner wall of the sealing shaft sleeve is movably connected with an L-shaped rod, the horizontal end of the L-shaped rod is fixedly connected with the outer wall of the second support plate, the inner wall of the rectangular heat insulation box is fixedly connected with a heating wire, the outer wall of the rectangular heat insulation box is provided with a connecting hole four, and the inner wall of the connecting hole four is fixedly connected with a temperature sensor, the vertical end of the L-shaped rod is fixedly connected with the side end of the cross rod through bolts, and the outer wall of the rectangular heat insulation box is fixedly connected with a second electric push rod, and the moving end of the second electric push rod is fixedly connected with the rod wall of the L-shaped rod.

[0016] In the above-mentioned die forming device of real gold powder cake, the outer wall of the die forming cylinder is fixedly connected with two symmetrically distributed mounting holes, and the hole wall of the mounting hole is fixedly connected with a damping rubber air bag.

[0017] In the above-mentioned die forming device of real gold powder cake, the upper surface of the support table is fixedly connected with a belt conveyor, and the discharge end of the die pressing metal cylinder is located directly above the belt conveyor.

[0018] In the above-mentioned die forming device of real gold powder cake, the bottom end of the support table is fixedly connected with a PLC controller and a control panel, and the lower surface of the support table is fixedly connected with support legs at the four corners.

[0019] Compared with the prior art, the die forming device of real gold powder cake has the following advantages:

[0020] 1. By arranging the elastic rubber sealing cover, when the real gold powder needs to be die pressed into a real gold powder cake after being ground, the elastic rubber sealing cover is first sleeved on the discharge port of the real gold powder grinding equipment, and the top end connection of the elastic rubber sealing cover is tightly bound by a cable tie, then the ground real gold powder falls into the transparent hopper for temporary storage, and sufficient real gold powder is provided for the real gold powder cake die forming device, and the problem of waste and pollution caused by the scattering of real gold powder is avoided by the elastic rubber sealing cover.

[0021] 2. Through the set mold pressure adjustment mechanism, the staff uses the particle size of the ground gold powder as a basis and presets the safety mold pressure threshold P in the PLC controller through the control panel. This is because the larger the gold powder particles are, the greater the molding resistance generated during the molding process after accumulation, which makes the safety mold pressure required to mold the gold powder into a gold powder cake also greater. Air is injected into the adjustment cylinder through the air inflation device, and the air pressure value of the cavity B between the first support plate and the sealing piston is ensured by the normally open solenoid valve to reach the safety mold pressure threshold P preset by the PLC controller. Then, the PLC controller controls the normally open solenoid valve to be energized and closed to ensure that there is sufficient mold pressure when the sealing block and the molding cylinder are matched, so as to ensure uniform force during the molding of the gold powder and improve the quality of the molding process.

[0022] 3. Through the set quantitative mechanism, the three quantitative troughs of the quantitative mechanism can quantitatively deliver real gold powder from the transparent hopper. The amount of real gold powder measured by one quantitative trough is one-third of the total amount of real gold powder cake. When the rotating block rotates once, the three quantitative troughs can accurately measure the real gold powder, so that the staff does not need to spend time and effort weighing, reducing the error of manual weighing. This not only improves the convenience and efficiency of real gold powder cake molding, but also reduces the labor intensity of the staff.

[0023] 4. The molding process involves a pressure adjustment mechanism, a metering mechanism, a molding mechanism, a second electric push rod, and an L-shaped rod. The operator then sends commands to the PLC controller via the control panel. Upon receiving the commands, the PLC controller controls the servo motor, heating wire, second electric push rod, and belt conveyor to automatically perform the molding process for the gold powder cake. The servo motor drives the rotating block to rotate 60° every 10 seconds, with each 60° rotation taking 2 seconds. This ensures that the three metering troughs continuously deliver gold powder. During one rotation of the rotating block, the three metering troughs of the metering mechanism accurately deliver the gold powder. The powder molding mechanism, in conjunction with the molding pressure adjustment mechanism, molding mechanism, first electric push rod, second electric push rod, and L-shaped rod, under the control of the PLC controller, can realize automatic layer-by-layer molding of real gold powder cakes. This effectively improves the uniformity of force during molding of real gold powder cakes, ensuring that the center position of the real gold powder cake is firmly molded. After molding, the real gold powder cake is transferred to the belt conveyor by the robotic arm and negative pressure suction cup. The belt conveyor transfers the real gold powder cake to the next production process, avoiding the situation of the real gold powder cake breaking during the transfer process and avoiding the economic loss caused by the real gold powder scattering. This improves the efficiency and pass rate of real gold powder molding and forming.

[0024] 5、By setting the mold pressing auxiliary mechanism, when the mold pressing forming device processes the real gold powder cake, the PLC controller also controls the start of the mold pressing auxiliary mechanism, the mold pressing auxiliary mechanism heats the mold pressing metal cylinder, so that the internal temperature of the mold pressing metal cylinder is maintained at the temperature threshold value preset by the PLC controller, so that the mold pressing cavity of the mold pressing metal cylinder forms a high-temperature environment, the yield strength of the real gold powder in the high-temperature environment of the mold pressing cavity will be significantly reduced, and the plastic deformation ability of the particles will be greatly enhanced, which makes the real gold powder particles more easily flow under the action of the mold pressing external force, can fill the gap between the particles, recesses and corners, further avoid the defect of local loose caused by particle rigid collision, at the same time, high temperature can also reduce the friction coefficient of the surface of the real gold powder particles, reduce mechanical jam, let the mold pressing pressure more evenly transmit to the inside of the powder cake, and the natural cooling shrinkage process after the mold pressing is completed further strengthens the performance of the powder cake, can make the mechanical occlusion of the particle mold pressing more closely, improve the structural stability and bending strength, avoid the real gold powder cake from cracking during the transfer process, at the same time, avoid the economic loss caused by the scattering of real gold powder, improve the efficiency and qualified rate of the mold pressing forming process of real gold powder. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of a mold pressing forming device for real gold powder cake provided by the application;

[0026] Figure 2 It is a structure schematic view of a mold pressing force adjusting mechanism in a mold pressing forming device for real gold powder cake provided by the application;

[0027] Figure 3 It is a structure schematic view of a sealing piston part in a mold pressing forming device for real gold powder cake provided by the application;

[0028] Figure 4 It is a structure schematic view of a quantitative mechanism in a mold pressing forming device for real gold powder cake provided by the application;

[0029] Figure 5 It is Figure 4 a structure schematic view of a part in section;

[0030] Figure 6 It is a structure schematic view of a mold pressing mechanism in a mold pressing forming device for real gold powder cake provided by the application;

[0031] Figure 7 It is a structure schematic view of a part in section of a mold pressing auxiliary mechanism in a mold pressing forming device for real gold powder cake provided by the application;

[0032] Figure 8 It is a structure schematic view of the outside of a rectangular heat insulation box in a mold pressing forming device for real gold powder cake provided by the application;

[0033] Figure 9 is a schematic view of the structure of the second air outlet one-way valve part of a real gold powder cake mold forming device provided by the present application.

[0034] In the figure: 1 support table, 2 fixed frame, 3 adjusting cylinder, 4 mold pressure adjusting mechanism, 41 first electric push rod, 42 first support plate, 43 first sealing ring, 44 air pressure sensor, 45 fixed ring, 46 normally open solenoid valve, 5 moving rod, 6 quantitative mechanism, 61 annular shell, 62 material guide hopper, 63 connecting bearing, 64 rotating rod, 65 rotating circular block, 66 quantitative material groove, 67 sealing rubber film layer, 68 servo motor, 7 mold mechanism, 71 mold forming cylinder, 72 crossbar, 73 ceramic breathable filter block, 8 mold auxiliary mechanism, 81 rectangular heat insulation box, 82 first air outlet one-way valve, 83 first air inlet one-way valve, 84 annular cavity, 85 second sealing ring, 86 second support plate, 87 second air outlet one-way valve, 88 sealing shaft sleeve, 89 L-shaped rod, 810 heating wire, 811 temperature sensor, 812 second electric push rod, 9 damping rubber air bag, 10 plugging block, 11 mold metal cylinder, 12 sealing piston, 13 L-shaped plate, 14 transparent hopper, 15 elastic rubber sealing cover, 16 belt conveyor, 17 PLC controller, 18 control panel, 19 support leg. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] As shown in Figures 1-9 A mold forming device for real gold powder cakes includes a support table 1, a fixed frame 2 is fixedly connected to the upper surface edge of the support table 1, an adjusting cylinder 3 is fixedly connected to the mounting hole inner wall of the fixed frame 2, and a mold pressure adjusting mechanism 4 is fixedly connected to the fixing hole wall of the adjusting cylinder 3. The mold pressure adjusting mechanism 4 includes a first electric push rod 41 fixedly embedded at the side end of the adjusting cylinder 3, a first support plate 42 is fixedly connected to the moving end of the first electric push rod 41, a first sealing ring 43 is fixedly connected to the outer wall of the first support plate 42, a connecting hole one and a connecting hole two are formed in the outer wall of the first support plate 42, an air pressure sensor 44 is fixedly connected to the hole wall of the connecting hole one, a fixed ring 45 is fixedly connected to the hole wall of the connecting hole two, and a normally open solenoid valve 46 is fixedly connected to the inner wall of the fixed ring 45.

[0037] The inner wall of the side end movable hole of the adjusting cylinder 3 movably connects a moving rod 5, one end of the moving rod 5 fixedly connected to the inner wall of the adjusting cylinder 3 movably connects a sealing piston 12, the outer end of the moving rod 5 fixedly connects a blocking block 10, the connecting end of the blocking block 10 movably and sealingly sleeves a die metal cylinder 11, the upper surface of the die metal cylinder 11 fixedly connects an L-shaped plate 13, the top end of the L-shaped plate 13 fixedly embeds a transparent hopper 14, the top end of the transparent hopper 14 fixedly connects an elastic rubber sealing cover 15, the bottom end of the transparent hopper 14 fixedly communicates with a quantitative mechanism 6, the bottom end of the quantitative mechanism 6 passes through the top end of the die metal cylinder 11 and fixedly communicates with the die cavity of the die metal cylinder 11.

[0038] The quantitative mechanism 6 includes an annular shell 61 fixedly communicated with the discharge end of the transparent hopper 14, the bottom end of the annular shell 61 fixedly communicates with a guide hopper 62, the bottom end of the guide hopper 62 passes through the top end of the die metal cylinder 11 and fixedly communicates with the die cavity of the die metal cylinder 11, the outer wall of the annular shell 61 fixedly connects a connecting bearing 63, the inner wall of the two connecting bearings 63 fixedly connects a rotating rod 64, the rod wall of the rotating rod 64 fixedly sleeves a rotating circular block 65, the outer wall of the rotating circular block 65 uniformly opens three quantitative grooves 66, the outer wall of the rotating circular block 65 fixedly sleeves a sealing rubber film layer 67 in contact with the inner wall of the annular shell 61, the outer wall of the annular shell 61 fixedly connects a servo motor 68, the driving end of the servo motor 68 fixedly connects the side end of the rotating rod 64.

[0039] The inner wall of the die metal cylinder 11 movably connects a die mechanism 7, the die mechanism 7 includes a die forming cylinder 71 movably connected with the inner wall of the die metal cylinder 11, the inner wall of the die forming cylinder 71 fixedly connects a cross rod 72, the outer wall of the die forming cylinder 71 opens a plurality of air holes, and the hole wall of the air hole fixedly connects a ceramic air permeable filter block 73, the outer wall of the die forming cylinder 71 fixedly connects two symmetrically distributed mounting holes, and the hole wall of the mounting hole fixedly connects a damping rubber air bag 9.

[0040] The bottom end of the die pressing metal cylinder 11 is fixedly connected with a die pressing auxiliary mechanism 8, the die pressing auxiliary mechanism 8 comprises a rectangular heat insulation box 81 fixedly connected with the outer wall of the bottom end of the die pressing metal cylinder 11, the bottom end of the rectangular heat insulation box 81 is fixedly connected with the upper surface of the support table 1, the top end of the rectangular heat insulation box 81 is fixedly communicated with a first air outlet one-way valve 82 and a first air inlet one-way valve 83, the inside of the die pressing metal cylinder 11 is provided with an annular cavity 84, the top end of the first air outlet one-way valve 82 and the first air inlet one-way valve 83 is fixedly communicated with the annular cavity 84 in the inside of the die pressing metal cylinder 11, the inner wall of the rectangular heat insulation box 81 is sealingly and movably connected with a second sealing ring 85, the inner wall of the second sealing ring 85 is fixedly connected with a second support plate 86, the outer wall of the second support plate 86 is provided with a connecting hole three, and the hole wall of the connecting hole three is fixedly connected with a second air outlet one-way valve 87, the outer wall of the rectangular heat insulation box 81 is fixedly embedded with a sealing shaft sleeve 88, the inner wall of the sealing shaft sleeve 88 is movably connected with an L-shaped rod 89, the horizontal end of the L-shaped rod 89 is fixedly connected with the outer wall of the second support plate 86, the inner wall of the rectangular heat insulation box 81 is fixedly connected with a heating wire 810, the outer wall of the rectangular heat insulation box 81 is provided with a connecting hole four, and the inner wall of the connecting hole four is fixedly connected with a temperature sensor 811, the vertical end of the L-shaped rod 89 is fixedly connected with the side end of the horizontal rod 72 through bolts, the outer wall of the rectangular heat insulation box 81 is fixedly connected with a second electric push rod 812, and the moving end of the second electric push rod 812 is fixedly connected with the rod wall of the L-shaped rod 89.

[0041] The upper surface of the support table 1 is fixedly connected with a belt conveyor 16, the discharge end of the die pressing metal cylinder 11 is located directly above the belt conveyor 16, the bottom end outer wall of the support table 1 is fixedly connected with a PLC controller 17 and a control panel 18, and the lower surface of the support table 1 is fixedly connected with support legs 19 at the four corners.

[0042] The first electric push rod 41, the normally open electromagnetic valve 46, the servo motor 68, the heating wire 810, the second electric push rod 812 and the belt conveyor 16 are all electrically connected with the output end of the PLC controller 17 through wires, and the air pressure sensor 44, the temperature sensor 811 and the control panel 18 are all electrically connected with the input end of the PLC controller 17 through wires, and the above-mentioned power supply devices and electrical connections are all prior art and will not be described here.

[0043] The operation principle of the present application is described as follows: when the real gold powder needs to be die pressed into real gold powder cakes after being ground, the elastic rubber sealing cover 15 is first sleeved on the discharge port of the real gold powder grinding equipment, and the top end connection of the elastic rubber sealing cover 15 is tightened by a cable tie, so as to avoid the problem of waste and pollution caused by the scattering of real gold powder through the elastic rubber sealing cover 15;

[0044] The ground real gold powder falls into the transparent hopper 14 for temporary storage and provides sufficient real gold powder for the real gold powder cake molding device. Meanwhile, the staff determines the particle size of the ground real gold powder and sets the safe molding pressure threshold P in the PLC controller 17 through the control panel 18. The larger the real gold powder particles, the greater the molding resistance generated during the molding process after stacking, and the greater the safe molding pressure required for molding the real gold powder into a real gold powder cake. At this time, the insertion part of the blocking block 10 is fully inserted into the inside of the molding metal cylinder 11, ensuring that the distance between the inside end of the insertion part of the blocking block 10 and the molding forming cylinder 71 is one-third of the thickness of the real gold powder cake. Then the staff connects the air outlet of the inflator to the air nozzle of the adjusting cylinder 3, and the inflator fills the cavity B between the first support plate 42 and the sealing piston 12 with air through the adjusting cylinder 3 and the normally open electromagnetic valve 46, and raises the air pressure of the cavity B. Until the air pressure value detected by the air pressure sensor 44 reaches the safe molding pressure threshold P preset by the PLC controller 17, the PLC controller 17 controls the normally open electromagnetic valve 46 to be energized. After the normally open electromagnetic valve 46 is energized, the internal electromagnetic part works and makes the normally open electromagnetic valve 46 close and maintain the air pressure in the area between the first support plate 42 and the sealing piston 12 stable. Then the inflator is removed.

[0045] Then the staff sends instructions to the PLC controller 17 through the control panel 18, and the PLC controller 17 receives the instructions and controls the servo motor 68, heating wire 810, second electric push rod 812 and belt conveyor 16 to work and automatically process the molding of the real gold powder cake. The driving end of the servo motor 68 drives the rotating block 65 to rotate 60° every 10 seconds, and each 60° rotation process takes 2 seconds, so that the three quantitative hoppers 66 (A1, A2 and A3) can continuously convey real gold powder. The specific steps are as follows:

[0046] The first step is when the quantitative hopper 66 (A1) of the rotating block 65 is at the uppermost position, the real gold powder inside the transparent hopper 14 will fall and fill the quantitative hopper 66 (A1). At this time, the amount of real gold powder in the quantitative hopper 66 (A1) is one-third of the amount of real gold powder in the real gold powder cake.

[0047] The second step is that the driving end of the servo motor 68 first controls the rotating block 65 to continue rotating 60°, and then during the 10 seconds of this step, the quantitative hopper 66 (A1) filled with real gold powder is at the position of the right oblique top of the annular shell 61. The quantitative hopper 66 (A1) filled with real gold powder is sealed by the inner wall of the annular shell 61, and at the same time the inner wall of the annular shell 61 will scrape off the excess real gold powder on the top of the quantitative hopper 66 (A1), thereby ensuring the accuracy of the quantitative hopper 66 (A1) for real gold powder.

[0048] The third step, first servo motor 68 control rotating block 65 rotate 60 ° again, at this time, the previous full of real gold powder quantitative hopper 66 (A1) is rotated to the right oblique lower position of the annular shell 61, then in the 10 seconds of this step, the quantitative hopper 66 (A2) on the rotating block 65 is rotated to the uppermost of the annular shell 61, and is in communication with the transparent hopper 14, at the same time, the first step is carried out, and the quantitative conveying of real gold powder is carried out to carry out the real gold powder cake molding work;

[0049] The fourth step, first servo motor 68 control rotating block 65 continue to rotate 60 °, at this time, the quantitative hopper 66 (A1) is rotated to the lowermost of the annular shell 61, then in the 10 seconds of this step, the real gold powder in the quantitative hopper 66 (A1) is poured into the molding cavity of the molding metal cylinder 11 through the guide hopper 62, and the quantitative hopper 66 (A2) is in the process of the second step;

[0050] The fifth step, first servo motor 68 drive rotating block 65 continue to rotate 60 °, at this time, the quantitative hopper 66 (A1) is in the left oblique lower position of the annular shell 61, then in the 10 seconds of this step, in the 2-5 seconds, the second electric push rod 812 moves the end to retract completely, the second electric push rod 812 moves the end to retract, the L-shaped rod 89 retracts, the L-shaped rod 89 pushes the molding forming cylinder 71 to approach the blocking block 10 through the cross rod 72, at the same time, the molding forming cylinder 71 pushes the real gold powder entering the molding cavity to approach the blocking block 10, and cooperates with the blocking block 10 to mold the real gold powder into a powder cake, in this process, the air in the molding metal cylinder 11 enters the molding forming cylinder 71 through the ceramic air permeable filter block 73, finally makes the damping rubber air bag 9 slightly expand to store air temporarily, the volume of the damping rubber air bag 9 changes little after expansion, does not contact with the inner wall of the molding metal cylinder 11, avoids the friction damage of the damping rubber air bag 9, the real gold powder in the molding cavity is hindered by the ceramic air permeable filter block 73, guarantees the accuracy of the real gold powder cake forming processing, and since the blocking block 10 contacts with the cavity B through the moving rod 5 and the sealing piston 12, the air pressure of the cavity B can hinder the backward movement of the blocking block 10 and push the blocking block 10 backward, so that the real gold powder can be subjected to bidirectional stress during the process that the blocking block 10 and the molding forming cylinder 71 mold the real gold powder, guaranteeing that the real gold powder is subjected to uniform stress during the molding process, improving the molding effect, and the closest state between the blocking block 10 and the molding forming cylinder 71 is maintained for 2 seconds (i.e. 5-7 seconds of the 10 seconds of this step), so that the real gold powder is subjected to uniform and reliable stress during the molding process;

[0051] Then after the compression molding (i.e. the last 3 seconds of the 10 seconds of this step), the PLC controller 17 not only controls the moving end of the second electric push rod 812 to fully extend, but also controls the moving end of the second electric push rod 812 to push the L-shaped rod 89 to move outward, and the L-shaped rod 89 drives the compression molding cylinder 71 to move outward through the horizontal rod 72, so that the compression molding cylinder 71 is not located below the material guide hopper 62, avoiding the compression molding cylinder 71 from blocking the true gold powder inside the material guide hopper 62 from falling into the compression cavity of the compression metal cylinder 11, and at the same time, a negative pressure environment is generated in the compression metal cylinder 11, and the air in the damping rubber air bag 9 returns to the compression cavity under the influence of the negative pressure environment, so as to maintain the pressure balance of the compression cavity, and in the process of returning, the ceramic air-permeable filter block 73 can also be back-flushed to ensure that the ceramic air-permeable filter block 73 can work continuously and reliably, and the PLC controller 17 also controls the moving end of the first electric push rod 41 to retract one-third of the thickness of the true gold powder cake (the specific value of the thickness can be pre-set by the PLC controller 17), and the moving end of the electric push rod drives the first support plate 42 to retract, and due to the sealing of the first sealing ring 43 and the air pressure balance characteristics of the cavity B, the sealing piston 12, the moving rod 5 and the blocking block 10 move outward synchronously by a distance of one-third of the thickness of the true gold powder cake, thereby reserving a cavity of one-third of the thickness of the true gold powder cake inside the compression metal cylinder 11 to continue the compression molding process of the true gold powder inside the quantitative material groove 66 (A2);

[0052] At this time, the quantitative material groove 66 (A2) is in the process of the third step, and the quantitative material groove 66 (A3) is in the process of the first step;

[0053] The sixth step, first, the servo motor 68 continues to drive the rotating circular block 65 to rotate 60°, then the quantitative material groove 66 (A1) is located at the left inclined top of the annular shell 61, the quantitative material groove 66 (A2) is located at the lowermost part of the annular shell 61 and is in the process of the fourth step, and the quantitative material groove 66 (A3) is in the process of the second step;

[0054] Then when the quantitative tank 66 (A2) is in the late stage of the fifth step, the PLC controller 17 controls the first electric push rod 41 to continue to retract the thickness of the gold powder cake by one third, and the thickness of the gold powder cake reaches two thirds. When the quantitative tank 66 (A3) is in the late stage of the fifth step, the thickness of the gold powder cake is qualified, and the PLC controller 17 controls the first electric push rod 41 to fully retract, and the sealing block 10 is completely separated from the mold metal cylinder 11 through the mold pressure adjusting mechanism 4, the sealing piston 12 and the moving rod 5, so that the qualified gold powder cake leaks out, and the gold powder cake in the mold metal cylinder 11 is sucked out by the mechanical arm and the negative pressure suction disc, and is conveyed to the conveying belt surface of the belt conveyor 16, and then is conveyed to the next production process through the belt conveyor 16. At the same time, in the last second of this step, the PLC controller 17 controls the first electric push rod 41 to fully extend, and the moving end of the first electric push rod 41 inserts the sealing block 10 into the mold metal cylinder 11 again through the mold pressure adjusting mechanism 4, the sealing piston 12 and the moving rod 5. Thus, the gold powder cake is formed by layer-by-layer mold pressing, which avoids the internal loose defect of the gold powder cake, ensures the firm and reliable structure of the gold powder cake, avoids the cracking of the gold powder cake during transportation, avoids the economic damage caused by the scattering of the gold powder, and improves the reliability of the mold pressing device.

[0055] During the process of molding the real gold powder cake, the PLC controller 17 also controls the heating wire 810 to work. The heating wire 810 generates heat to raise the temperature of the air inside the rectangular heat insulation box 81, and the temperature of the air is monitored in real time through the temperature sensor 811. The temperature sensor 811 transmits the detected temperature value to the PLC controller 17 in the form of an electric signal. If the temperature of the air inside the rectangular heat insulation box 81 reaches the preset temperature threshold (such as 75 degrees Celsius) of the PLC controller 17, the PLC controller 17 controls the heating power of the heating wire 810 to ensure that the temperature inside the rectangular heat insulation box 81 is maintained at the preset temperature threshold. In addition, during the reciprocating movement of the L-shaped rod 89 driven by the second electric push rod 812, the L-shaped rod 89 drives the second supporting plate 86 to move. When the L-shaped rod 89 drives the second supporting plate 86 to move, the hot air in the rectangular heat insulation box 81 enters the annular cavity 84 through the first air outlet check valve 82, and the temperature of the molding cavity inside the molding metal cylinder 11 is raised, so that the temperature of the molding cavity also reaches the preset temperature threshold of the PLC controller 17. At the same time, the air in the annular cavity 84 enters the side of the rectangular heat insulation box 81 away from the heating wire 810 through the first air inlet check valve 83. When the L-shaped rod 89 pulls the second supporting plate 86 to move, the air on the side of the rectangular heat insulation box 81 away from the heating wire 810 enters the space close to the heating wire 810 through the second air outlet check valve 87, and is heated by the heating wire 810 to adjust the temperature, so that the air temperature meets the preset temperature threshold of the PLC controller 17. In this way, the annular cavity 84 can continuously flow into hot air, and the high-temperature environment of the molding cavity inside the molding metal cylinder 11 is maintained;

[0056] When the real gold powder is molded in a high-temperature environment, the high temperature can improve the physical properties of the real gold powder. Although the melting point of real gold is as high as 1064°C, the yield strength of real gold in a high-temperature environment in the molding cavity will be significantly reduced, and the plastic deformation ability of the particles will be greatly enhanced. This makes the real gold powder particles more prone to flow under the action of external molding force, and can fully fill the gaps between particles, recesses and corner gaps, further avoiding the formation of local loose defects caused by particle rigid collision. At the same time, high temperature can also reduce the friction coefficient of the surface of the real gold powder particles, reduce mechanical jamming, make the molding pressure more uniformly transmitted to the inside of the powder cake, solve the problem of "compaction on the outside and looseness on the inside", and further improve the overall density and filling uniformity;

[0057] The natural cooling shrinkage process after the compression molding further enhances the performance of the powder cake. The real gold has stable thermal expansion characteristics, and when it cools from high temperature to room temperature, it will produce uniform shrinkage (shrinkage rate of about 0.05%). The "holding force" generated by this shrinkage can make the mechanical interlocking of the particles formed by the compression molding more tightly, like "cold shrinkage fastening" to consolidate the density, and the shrinkage process can release the residual stress accumulated during compression molding, making the internal stress distribution more uniform, reducing the risk of fragmentation of the real gold powder cake during transportation due to impact force, and also promoting the reduction of interatomic distance on the particle surface, enhancing the cold welding effect, improving the structural stability and bending strength. More importantly, the entire process relies on pure physical bonding (mechanical interlocking and cold welding), without involving chemical bonding or high-temperature sintering (far below the sintering temperature of real gold above 800°C), so during later use, only a small external force such as grinding or shaking is needed to break the physical bonding between the particles, easily restoring the real gold powder form, and because there is no chemical residue, it is almost impossible to produce hard-to-disperse lumps, perfectly balancing the forming strength and flexibility during later use.

[0058] The compression molding device of the present application not only has the functions of automatic quantification and automatic layer-by-layer compression molding of the real gold powder cake, effectively improving the uniformity of the force during compression molding of the real gold powder cake, ensuring that the center position of the real gold powder cake is firmly molded, but also has the ability to assist in compression molding by heating. When heated, it can reduce the frictional resistance between the real gold powders, improve the compaction degree, and avoid structural defects such as "dense outside and loose inside". After the real gold powder cake cools down, the cold welding effect produced by cold shrinkage further improves the structural strength of the real gold powder cake, avoiding the situation of cracking during transportation of the real gold powder cake, and avoiding economic losses caused by the scattering of real gold powder, improving the efficiency and qualification rate of real gold powder compression molding processing, and reducing the labor intensity of workers. In addition, the compression molding device can also adaptively adjust the compression molding force according to the size of the real gold powder particles, avoiding the irreversible clumping of the real gold powder during compression molding, and improving the reliability of the real gold powder compression molding device.

[0059] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A molding apparatus for a real gold powder compact, comprising a support platform (1), characterized in that, A fixing frame (2) is fixedly connected to the upper surface edge of the support platform (1), and an adjusting cylinder (3) is fixedly connected to the inner wall of the mounting hole of the fixing frame (2), and a mold pressure adjusting mechanism (4) is fixedly connected to the fixing hole wall of the adjusting cylinder (3). A movable rod (5) is movably connected to the inner wall of the movable hole at the side end of the regulating cylinder (3). A sealing piston (12) is fixedly connected to one end of the movable rod (5) located inside the regulating cylinder (3) and is movably connected to the inner wall of the regulating cylinder (3). A sealing block (10) is fixedly connected to the outer end of the movable rod (5). A molded metal cylinder (11) is movably sleeved at the connecting end of the sealing block (10). An L-shaped plate (13) is fixedly connected to the upper surface of the molded metal cylinder (11). A transparent hopper (14) is fixedly embedded at the top of the L-shaped plate (13). An elastic rubber sealing cover (15) is fixedly connected to the top of the transparent hopper (14). A metering mechanism (6) is fixedly connected to the bottom of the transparent hopper (14). The bottom of the metering mechanism (6) passes through the top of the molded metal cylinder (11) and is fixedly connected to the molding cavity of the molded metal cylinder (11). The inner wall of the molded metal cylinder (11) is sealed and movably connected to a molding mechanism (7), and the bottom end of the molded metal cylinder (11) is fixedly connected to a molding auxiliary mechanism (8).

2. The molding apparatus for a real gold powder compact according to claim 1, characterized in that, The mold pressure regulating mechanism (4) includes a first electric push rod (41) fixedly embedded in the side end of the regulating cylinder (3). The moving end of the first electric push rod (41) is fixedly connected to a first support plate (42). The outer wall of the first support plate (42) is fixedly connected to a first sealing ring (43). The outer wall of the first support plate (42) is provided with a first connection hole and a second connection hole. The wall of the first connection hole is fixedly connected to a pressure sensor (44). The wall of the second connection hole is fixedly connected to a fixing ring (45). The inner wall of the fixing ring (45) is fixedly connected to a normally open solenoid valve (46).

3. The molding apparatus for a real gold powder compact according to claim 1, characterized in that, The metering mechanism (6) includes an annular shell (61) fixedly connected to the discharge end of the transparent hopper (14). The bottom end of the annular shell (61) is fixedly connected to a guide hopper (62). The bottom end of the guide hopper (62) passes through the top end of the molded metal cylinder (11) and is fixedly connected to the molding cavity of the molded metal cylinder (11). Both outer walls of the annular shell (61) are fixedly connected to connecting bearings (63). The inner walls of the two connecting bearings (63) are fixedly connected to a rotating rod (64). The rod wall of the rotating rod (64) is fixedly sleeved with a rotating block (65). The outer wall of the rotating block (65) is evenly provided with three metering grooves (66). The outer wall of the rotating block (65) is fixedly sleeved with a sealing rubber film layer (67) that contacts the inner wall of the annular shell (61). The outer wall of the annular shell (61) is fixedly connected to a servo motor (68). The drive end of the servo motor (68) is fixedly connected to the side end of the rotating rod (64).

4. The molding apparatus for a real gold powder compact according to claim 1, characterized in that, The molding mechanism (7) includes a molding cylinder (71) that is sealed and movably connected to the inner wall of the molding metal cylinder (11). A crossbar (72) is fixedly connected to the inner wall of the molding cylinder (71). A plurality of ventilation holes are opened on the outer wall of the molding cylinder (71), and ceramic breathable filter blocks (73) are fixedly connected to the hole walls of the ventilation holes.

5. The molding apparatus for a real gold powder compact according to claim 4, characterized in that, The molding auxiliary mechanism (8) includes a rectangular heat insulation box (81) fixedly connected to the outer wall of the bottom end of the molding metal cylinder (11). The bottom end of the rectangular heat insulation box (81) is fixedly connected to the upper surface of the support platform (1). The top end of the rectangular heat insulation box (81) is fixedly connected to a first exhaust check valve (82) and a first intake check valve (83). An annular cavity (84) is opened inside the molding metal cylinder (11). The top ends of the first exhaust check valve (82) and the first intake check valve (83) are fixedly connected to the annular cavity (84) inside the molding metal cylinder (11). A second sealing ring (85) is movably connected to the inner wall of the rectangular heat insulation box (81). A second support plate (86) is fixedly connected to the inner wall of the second sealing ring (85). A connection hole three is opened on the outer wall of the second support plate (86). A second venting check valve (87) is fixedly connected to the wall of the connecting hole three. A sealing bushing (88) is fixedly embedded in the outer wall of the rectangular heat insulation box (81). An L-shaped rod (89) is movably connected to the inner wall of the sealing bushing (88). The horizontal end of the L-shaped rod (89) is fixedly connected to the outer wall of the second support plate (86). A heating wire (810) is fixedly connected to the inner wall of the rectangular heat insulation box (81). A connecting hole four is opened on the outer wall of the rectangular heat insulation box (81), and a temperature sensor (811) is fixedly connected to the inner wall of the connecting hole four. The vertical end of the L-shaped rod (89) is fixedly connected to the side end of the crossbar (72) by bolts. A second electric push rod (812) is fixedly connected to the outer wall of the rectangular heat insulation box (81). The moving end of the second electric push rod (812) is fixedly connected to the rod wall of the L-shaped rod (89).

6. The molding apparatus for a real gold powder compact according to claim 4, characterized in that, The outer wall of the molding cylinder (71) is fixedly connected to two symmetrically distributed mounting holes, and the wall of the mounting holes is fixedly connected to a damping rubber airbag (9).

7. The molding apparatus for a real gold powder compact according to claim 1, characterized in that, A belt conveyor (16) is fixedly connected to the upper surface of the support platform (1), and the discharge end of the molded metal cylinder (11) is located directly above the belt conveyor (16).

8. The molding apparatus for a real gold powder compact according to claim 1, characterized in that, The bottom outer wall of the support platform (1) is fixedly connected to a PLC controller (17) and a control panel (18), and support legs (19) are fixedly connected to the four corners of the lower surface of the support platform (1).

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