Bronze-clad iron composite iron powder and its manufacturing method and device

Abstract

This scheme belongs to the technical field of metal powder preparation, and specifically relates to a bronze-clad iron composite iron powder and a manufacturing method and device thereof. A bronze-clad iron composite iron powder includes: a composite powder composed of iron, copper and tin, and the mass ratio of the iron, copper and tin is 5:4:1; a bronze-clad iron composite iron powder manufacturing device includes: a solid-liquid reaction device, a liquid separation and drying device, a reduction device and a diffusion device, and the solid-liquid separation and drying device, the reduction device and the diffusion device are connected in sequence; a bronze-clad iron composite iron powder manufacturing method uses a bronze-clad iron composite iron powder manufacturing device to manufacture a bronze-clad iron composite iron powder. This scheme solves the characteristics of low hardness and weak corrosion resistance of copper-clad iron powder, and also selects a physical stirring method to solve the problem of uneven mixing after the iron powder is put into the copper sulfate solution without excessively increasing the production cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal powder preparation, and specifically relates to a bronze-clad iron composite iron powder and a manufacturing method and device thereof. Background Art

[0002] Copper powder and bronze powder are used in oil-containing bearings, diamond products and friction materials, either alone or in combination, or mixed with iron powder. However, the use of copper powder and bronze powder alone is expensive; the use of copper powder and bronze powder mixed with iron powder will inevitably cause component segregation, and the independent hard iron particles will inevitably have a negative impact on the product. In order to solve this problem, copper-clad iron composite powder has been developed. The existence of copper-clad iron composite powder reduces production costs, solves the problem of powder segregation, and the complete copper coating on the surface of iron particles also improves product quality.

[0003] However, copper-clad iron composite powder has the disadvantages of low hardness and weak corrosion resistance when making oil-containing bearings and tiny structural parts. In the existing technology, copper powder and tin powder are mixed with iron powder to produce special oil-containing bearings and tiny structural parts, considering the requirements of high hardness and high corrosion resistance. At present, there is no copper-clad iron composite powder that has the characteristics of high hardness and high corrosion resistance at the same time.

[0004] At present, the preparation method of copper-clad iron composite iron powder mainly comprises: placing iron powder into copper sulfate solution for replacement to form copper-clad iron powder, and then drying, reducing and screening the obtained copper-clad iron powder to obtain copper-clad iron powder that meets the requirements. In the process of using this method to produce copper-clad iron composite iron powder, the prior art device has the problem of uneven copper-coated iron powder, which causes a reduction in the copper-clad iron powder obtained by subsequent screening, thereby reducing the production output of the copper-clad iron composite iron powder.

[0005] In order to solve the problem of uneven copper-coated iron powder, Chinese patent CN101116909A proposes an improved method after referring to a method for manufacturing copper-coated iron composite powder disclosed in Chinese patent CN1209216C and Chinese patent CN100348351C. Although the method of "using turbine stirring in the preparation process" mentioned in the method of Chinese patent CN101116909A can achieve the iron powder being drawn up from the middle and diffused radially, the diffusion effect achieved by turbine stirring alone is limited, and there are still many large-particle copper-coated iron powders that are clumped in the production process. The method proposed in Chinese patent CN106077623B is "taking iron powder and adding it to a sensitizing solution for sensitization, then adding it to an activating solution for activation to obtain activated iron powder, then mixing disodium ethylenediaminetetraacetic acid, copper sulfate solution, hydrazine solution and other substances to prepare a copper sulfate plating solution, adopting a reduction method with hydrazine as a reducing agent to reduce copper sulfate into copper powder and uniformly coating the activated iron powder to obtain a uniformly coated copper-coated iron composite powder". Although this method improves the uniformity of the copper-coated iron powder, it requires more cost to prepare the copper sulfate plating solution, and the cost of treating its waste liquid is also very high. Summary of the invention

[0006] The first purpose of this scheme is to provide a bronze-clad iron composite iron powder to solve the characteristics of low hardness and weak corrosion resistance of copper-clad iron powder.

[0007] The second purpose of this scheme is to provide a bronze-clad iron composite iron powder manufacturing device and method, select a physical stirring method, and solve the problem of uneven mixing after the iron powder is placed in the copper sulfate solution without excessively increasing the production cost.

[0008] In order to achieve the first purpose above, this scheme is implemented through the following schemes:

[0009] Provided is a bronze-clad iron composite iron powder, comprising: a composite powder consisting of iron, copper and tin, wherein the mass ratio of the iron, copper and tin is 5:4:1.

[0010] The principle and technical effect of this solution are:

[0011] Due to the addition of tin, the copper-tin alloy wrapped with iron powder has higher strength and hardness than pure copper, which makes them more suitable for bearing larger loads and pressures; the copper-tin alloy wrapped with iron powder has better corrosion resistance than pure copper and can maintain its performance in a variety of environments. At the same time, the copper-tin alloy wrapped with iron powder has good wear resistance and corrosion resistance than pure copper, especially in applications that require wear resistance and durability.

[0012] Copper-tin alloys also have the following advantages: Copper-tin alloys have a low melting point, which gives them better plasticity during casting and processing of oil bearings and tiny structural parts; Copper-tin alloys have excellent anti-friction properties, which makes them very suitable for applications that need to reduce friction and wear (such as oil bearings and tiny structural parts).

[0013] When the proportion of tin exceeds 10%, the bronze clad iron powder needs to be manufactured by casting, which will greatly increase the production cost. The bronze clad iron powder produced by using a tin content of less than 7% is not hard enough. The present invention sets the tin content to 8%-10% to ensure that the bronze clad iron powder has sufficient hardness without increasing the production cost.

[0014] It can be seen from this that a bronze-clad iron composite iron powder solves the characteristics of low hardness and weak corrosion resistance of copper-clad iron powder, and also has the advantages of high plasticity and high friction reduction performance.

[0015] In order to achieve the above second purpose, this scheme is implemented through the following schemes:

[0016] A bronze-clad iron composite iron powder manufacturing device was invented, comprising:

[0017] A bronze-clad iron composite iron powder manufacturing device, comprising: a solid-liquid reaction device, a solid-liquid separation and drying device, a reduction device and a diffusion device, wherein the solid-liquid reaction device, the solid-liquid separation and drying device, the reduction device and the diffusion device are connected in sequence, and further comprising:

[0018] The solid-liquid reaction device includes a reactor, a frame, a sleeve and a stirring device, wherein the reactor and the stirring device are both fixed on the frame; the stirring device includes a stirring component and a driving component for driving the stirring component, wherein the driving component includes a motor and a gear coaxially connected to the output shaft of the motor, wherein the gear is meshed with a rack, wherein the rack is rotatably connected to a driving rod, wherein an external thread is provided on an outer wall of the driving rod, wherein an internal thread is provided on the sleeve, wherein the sleeve is threadedly connected to the driving rod, wherein the sleeve is fixedly connected to the frame, and wherein the stirring component is arranged on the driving rod.

[0019] A method for manufacturing bronze-clad iron composite iron powder is provided, comprising the following steps:

[0020] S10: preparing iron powder, tin powder and copper sulfate solution according to the mass ratio of iron, copper and tin;

[0021] S20: putting the copper sulfate solution into the reactor, starting the solid-liquid reaction device, driving the stirring component to rotate and move downward while rotating and stirring the copper sulfate solution, and adding the prepared iron powder after the stirring device is turned on, and the iron powder is added to the copper sulfate solution to undergo a replacement reaction with the copper sulfate solution;

[0022] S30: After the rack moves to the maximum range of movement, the stirring device stops moving and rotating. After the reactor is left to stand until the liquid level does not change, the pressure detection device reads the pressure data. If:

[0023] S30a: The pressure detection device reads the pressure data, and the driving component drives the stirring component to move in the opposite direction of the previous movement direction and rotate and stir, and S3 is executed again;

[0024] S30b: The pressure detection device does not read the pressure data, and the solid-liquid mixture is released from the reactor;

[0025] S40: sending the solid-liquid mixture to a separation and drying device and a reduction device, and obtaining copper-coated iron powder by separation, drying, and introduction of hydrogen for reduction reaction. Then, the copper-coated iron powder is sent to a diffusion device and the prepared tin powder is added. The tin powder diffuses and fuses with copper in the diffusion device to obtain bronze-coated iron powder.

[0026] The principle and technical effect of this solution are:

[0027] A stirring device in a bronze-clad iron composite iron powder manufacturing device allows a motor and a coaxially connected gear to drive a meshing rack and a driving rod connected to a rack sliding rod to move in vertical and horizontal directions, and through the driving rod and a sleeve threadedly connected to the driving rod, the driving rod is rotated while moving vertically, thereby increasing the stirring range of the stirring device and achieving the effect of uniformly stirring a solid-liquid mixture in a reaction kettle; at the same time, the manufacturing cost of the stirring device is low. Compared with the prior art, the added gears, racks, sleeves and threaded rods only require a small amount of cost.

[0028] Since the stirring range is increased in a bronze-clad iron composite iron powder manufacturing device, the effect of uniformly stirring the solid-liquid mixture in the reaction kettle is achieved, so that the contact area between the copper sulfate solution and the iron powder is increased, thereby increasing the replacement reaction speed of the copper sulfate solution and the iron powder, reducing the reaction time of the replacement reaction, and achieving the result of improving production efficiency.

[0029] A method for manufacturing bronze-clad iron composite iron powder comprises first adding a copper sulfate solution, stirring the copper sulfate solution and adding the iron powder, so that the iron powder can be quickly dispersed after being added to the copper sulfate solution, thereby solving the problem of uneven mixing of the iron powder after being put into the copper sulfate solution.

[0030] In the prior art, in order to obtain specific information on the progress of the replacement reaction, two methods are usually used: observing the liquid level in the reactor or detecting the iron sulfate concentration of the liquid in the reactor. The method of detecting the iron sulfate concentration requires collecting high-temperature liquid from the reactor, which has a high safety risk; the method of observing the liquid level in the reactor requires stopping stirring and standing still for a period of time, but stopping stirring will cause the precipitate to stick together, which is not conducive to the full reaction and contact between the iron powder and the copper sulfate solution; in the actual production process, the stirring time of the iron powder in the copper sulfate solution is increased to allow the replacement reaction to be fully reacted in an over-mixing manner, but this method sacrifices production efficiency and increases production costs.

[0031] This scheme can indirectly judge the progress of the reaction without collecting high-temperature liquid, which increases the safety of the production process; this scheme can fully stir the solid-liquid mixture evenly when stirring the solid mixture, and even if there is adhesion during precipitation, the adhering solids can be separated; compared with the actual production process, the reduced production time of this scheme is greater than the time for stopping stirring and reading the pressure detection data. It can be seen that this scheme can judge the progress of the reaction while improving production efficiency, thereby improving production efficiency while avoiding cost waste.

[0032] It can be seen from this that this scheme selects the physical stirring method, which solves the problem of uneven mixing after the iron powder is put into the copper sulfate solution without excessively increasing the production cost, while also improving the production efficiency and avoiding cost waste.

[0033] Furthermore, a pressure detection device is provided in the reactor.

[0034] The method of setting up the pressure detection device avoids the potential safety hazards of manual observation. At the same time, compared with the use of invasive detection tools, it saves the time of invasive operation, improves work efficiency, and thus reduces production costs.

[0035] Furthermore, the distance between the gear and the sleeve is greater than the length of the rack and less than the distance between the gear and the stirring member.

[0036] This approach can prevent the drive rod from being separated from the sleeve, thereby preventing production safety hazards.

[0037] Furthermore, the solid-liquid reaction device also includes an air wall device, which includes an air pump and an air jet component. The air pump is used to inject air into the air jet component, and the air outlet of the air jet component is arranged at the upper end of the reactor.

[0038] In this way, during stirring, the rack drives the piston rod to move up and down, and the air pump provides gas to the jet component, so that the jet component blows air toward the upper end of the reactor. The gas blown out by the jet component can prevent foreign matter from entering the reactor, thereby preventing the displacement reaction liquid level detection and the displacement reaction results from being affected by foreign matter, avoiding the pressure detection device from receiving detection interference, and improving the production quality of copper-clad iron powder.

[0039] Furthermore, the air wall device also includes an air storage device, the air inlet of the air storage device is connected to the air outlet of the air pump, and the air outlet of the air storage device is connected to the air inlet of the injection component.

[0040] Furthermore, in the steps S2-S3, when the driving component drives the stirring component to move up and down, the following steps are also included:

[0041] A1: The rack in the driving component drives the piston rod to move synchronously, and the air pump fills the connected air storage device with gas;

[0042] A2: The gas storage device stores the gas filled by the air pump.

[0043] The method of setting up the gas storage device can make full use of every portion of gas charged by the air pump. At the same time, the gas stored in the gas storage device can also be continuously provided to the injection component when the stirring device stops, so that the upper end of the reactor can continuously prevent foreign matter from entering the reactor, further increasing the effect of avoiding detection interference of the pressure detection device and improving the production quality of copper-clad iron powder.

[0044] Furthermore, the rack is slidably connected to a limiting component, and the sleeve is fixedly connected to the limiting component.

[0045] This prevents the gear from disengaging from the rack when rotating at high speed.

[0046] Furthermore, between the steps S1 and S2, the following steps are also included:

[0047] S15: Start the gas wall device, and the gas storage device determines the gas reserve amount, if:

[0048] S15a: If the gas reserve is less than or equal to 30%, a prompt tone is sounded, waiting for gas to be filled, and the system returns to S2a after filling the gas;

[0049] S15b: If the gas reserve is greater than 30%, gas is ejected toward the jetting component.

[0050] In the actual production process, since the surrounding air flow rate increases when copper sulfate solution is added, foreign matter in the air is more likely to enter the copper sulfate solution and the reactor, causing the copper sulfate solution to be contaminated. This solution opens the air wall device before adding the copper sulfate solution. This method can prevent foreign matter from entering the reactor earlier. Since the air pump starts to fill the gas storage device with gas after the air wall device is opened for a period of time, if the gas storage device is not equipped with enough gas in advance, the air wall device will not be able to continuously spray air to the upper end of the reactor before the air pump inflates, thereby failing to achieve the effect of continuously preventing foreign matter from entering the reactor. It can be seen that this solution further enhances the effect of preventing the pressure detection device from being interfered with and improving the production quality of copper-clad iron powder.

[0051] In summary: (1) This solution solves the problem of low hardness and weak corrosion resistance of copper-clad iron powder. (2) This solution uses physical stirring to solve the problem of uneven mixing of iron powder after it is put into copper sulfate solution without excessively increasing production costs. (3) This solution also has the additional effects of improving production efficiency, reducing production costs, improving production safety and improving production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic front view of the structure of a bronze-clad iron composite iron powder manufacturing device.

[0053] Figure 2 It is a partial side cross-sectional view of a bronze-clad iron composite iron powder manufacturing device.

[0054] The following is a further detailed description through specific implementation methods:

[0055] The figure marks in the drawings of the specification include: 1. motor; 2. motor shaft; 3. gear; 4. rack; 5. limit component; 6. sleeve; 7. air pump; 8. air storage device; 9. jet component; 10. feeding component; 11. baffle plate; 12. support member; 13. support shaft; 14. reactor; 15. stirring blade; 16. stirring rod; 17. driving rod; 18. elastic member. DETAILED DESCRIPTION

[0056] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0057] Example 1

[0058] A bronze-clad iron composite iron powder comprises: a composite powder composed of iron, copper and tin, wherein the mass ratio of the iron, copper and tin is 5:4:1.

[0059] A bronze-clad iron composite iron powder manufacturing device comprises: a solid-liquid reaction device, a solid-liquid separation and drying device, a reduction device and a diffusion device, wherein the solid-liquid reaction device, the solid-liquid separation and drying device, the reduction device and the diffusion device are connected in sequence (the reduction device and the diffusion device can use existing devices, and the solid-liquid separation and drying device can be selected by combining the solid-liquid separation device and the drying device).

[0060] like Figure 1-2 As shown, the solid-liquid reaction device includes a reactor 14, a frame, a sleeve 6 and a stirring device. The reactor 14 and the stirring device are both arranged on the frame (the reactor 14 and the stirring device are connected to the frame nuts, and can also be fixedly connected by welding, bonding, etc., the purpose of which is to keep the reactor 14 and the stirring device firmly placed during operation); the stirring device includes a stirring component and a driving component for driving the stirring component, the driving component includes a motor 1 and a gear 3 coaxially connected to the output shaft of the motor 1 (the motor shaft 2 is fixedly connected to the center of the gear 3, and the motor 1 can be an industrial motor with a larger power in the prior art. The weight and stirring speed of the stirring component must be considered when selecting the motor 1. A motor with too small power cannot drive the stirring component to move and rotate), the gear 3 is meshed with a rack 4, the rack 4 is rotatably connected to a driving rod 17, the outer wall of the driving rod 17 is provided with an external thread, the sleeve 6 is provided with an internal thread, the sleeve 6 is threadedly connected to the driving rod 17, the sleeve 6 is fixedly connected to the frame, and the stirring component is arranged on the driving rod 17.

[0061] A pressure detection device is provided in the reactor 14 . The pressure detection device is located on the inner wall of the reactor 14 , which is closest to the liquid level when the replacement reaction between the iron powder and the copper sulfate solution is complete and at a position where the pressure data cannot be read. The pressure detection device should be embedded in the inner wall of the reactor 14 .

[0062] The distance between the gear 3 and the sleeve 6 is greater than the length of the rack 4 and less than the distance between the gear 3 and the stirring member.

[0063] The rack 4 is slidably connected to the limiting component 5, and the sleeve 6 is fixedly welded to the limiting component 5.

[0064] A method for manufacturing bronze-clad iron composite iron powder comprises the following steps:

[0065] S10: preparing iron powder, tin powder and copper sulfate solution according to the mass ratio of iron, copper and tin;

[0066] S20: putting the copper sulfate solution into the reaction kettle 14, starting the solid-liquid reaction device, driving the stirring component to rotate and move downward while rotating and stirring the copper sulfate solution, and adding the prepared iron powder after the stirring device is turned on, and the iron powder is added to the copper sulfate solution to undergo a replacement reaction with the copper sulfate solution;

[0067] S30: After the rack moves to the maximum range of movement, the stirring device stops moving and rotating. After the reactor is left to stand until the liquid level does not change, the pressure detection device reads the pressure data. If:

[0068] S30a: The pressure detection device reads the pressure data, and the driving component drives the stirring component to move in the opposite direction of the previous movement direction and rotate and stir, and S3 is executed again;

[0069] S30b: The pressure detection device does not read the pressure data, and the solid-liquid mixture is released from the reaction kettle 14;

[0070] S40: sending the solid-liquid mixture to a separation and drying device and a reduction device, and obtaining copper-coated iron powder by separation, drying, and introduction of hydrogen for reduction reaction. Then, the copper-coated iron powder is sent to a diffusion device and the prepared tin powder is added. The tin powder diffuses and fuses with copper in the diffusion device to obtain bronze-coated iron powder.

[0071] When a bronze-clad-iron composite iron powder manufacturing device and method are used to manufacture a bronze-clad-iron composite iron powder, an operator is used as an executor of the method and an operator of the device.

[0072] When the operator operated for the first time, he prepared 200kg of iron powder, 10kg of tin powder and 100kg of copper sulfate solution according to a ratio of bronze-coated iron composite iron powder; the operator put the copper sulfate solution into the reactor 14, and after the copper sulfate solution was completely put in, the operator started the stirring device, and then put 200kg of iron powder completely into the reactor 14. After starting the stirring device, the motor 1 and the coaxially connected gear 3 rotate together, and the rotating gear 3 causes the meshing rack 4 to move downward, and at the same time, the driving rod 17 connected to the rack 4 moves downward; during the downward movement of the driving rod 17, the sleeve 6 (fixed on the frame) connected to the nut of the driving rod 17 causes the driving rod 17 to rotate in the threaded direction. The driving rod 17 moves downward with the fixed welded stirring component and rotates at the same time, so that the stirring component stirs the copper sulfate solution and the added iron powder downward. After the rack 4 moves to the maximum range, the motor 1 stops, and then the stirring device stops stirring. After waiting for a period of time, the liquid level in the reactor 14 tends to be calm, and the pressure detection device reads the pressure data. The motor 1 starts again and rotates in the opposite direction. Then the stirring device moves the stirring component upward and rotates to stir the solid-liquid mixture. After the rack 4 moves to the maximum range again, the stirring device stops stirring again. After waiting for a period of time, the liquid level in the reactor 14 tends to be calm again. The pressure detection device does not read the pressure data, and the reactor 14 releases the solid-liquid mixture. The operator sends the released solid-liquid mixture into the separation and drying device and the reduction device. Through separation, drying, and introduction of hydrogen to generate reduction reaction, copper-coated iron powder is obtained. The copper-coated iron powder is then sent to the diffusion device and the prepared 10kg tin powder is added. The 10kg tin powder is diffused and fused with copper in the diffusion device to obtain bronze-coated iron powder.

[0073] During the second operation, the operator prepared a copper sulfate solution containing 200 kg of iron powder, 10 kg of tin powder and 100 kg of copper sulfate according to a bronze-coated iron composite iron powder ratio; the operator put the copper sulfate solution into the reactor 14, and after the copper sulfate solution was completely put in, the operator started the stirring device, and then put 200 kg of iron powder into the reactor 14 completely. After starting the stirring device, the stirring device moves the stirring component downward and rotates to stir the copper sulfate solution and iron powder. After the rack 4 moves to the maximum range, the stirring device stops stirring, and the pressure detection device does not read the pressure data after the liquid surface tends to be calm. The reactor 14 releases the copper sulfate solution, and the motor 1 is started again, and the stirring component is brought back to the top and the stirring device is closed. The operator sends the released solid-liquid mixture into the separation and drying device and the reduction device, and obtains copper-coated iron powder by separation, drying, and introduction of hydrogen to generate reduction reaction, and then sends the copper-coated iron powder into the diffusion device and adds the prepared 10 kg of tin powder. The 10 kg of tin powder diffuses and fuses with copper in the diffusion device to obtain bronze-coated iron powder.

[0074] Example 2

[0075] Figure 1 , Figure 2 As shown, the solid-liquid reaction device also includes a gas wall device, which includes an air pump 8 and an air jet component 9. The air pump 7 is used to inject air into the air jet component 9. The air outlet of the air jet component 9 is arranged at the upper end of the reactor 14 (the air jet component 9 is adhered to the upper end of the reactor 14, as shown in FIG. Figure 2 As shown, the jet component 9 is provided with a plurality of air outlets, and the curvature of the jet component 9 is consistent with the curvature of the upper end of the reaction kettle 14).

[0076] The air wall device also includes an air storage device 8, the air inlet of the air storage device 8 is connected to the air outlet of the air pump 7, the air outlet of the air storage device 8 is connected to the air inlet of the jet component 9, the air inlet of the air pump 7 is connected to the outside, and a one-way valve is provided in the air pump. The one-way valve allows the gas passing through the air inlet of the air pump to flow only from the outside of the air pump to the inside of the air pump, and the gas passing through the air outlet of the air pump can only flow from the inside of the air pump to the air storage device.

[0077] Between steps S1 and S2, the following steps are also included:

[0078] S15: Start the gas wall device, and the gas storage device 8 determines the gas reserve amount. If:

[0079] S15a: If the gas reserve is less than or equal to 30%, a prompt tone is sounded, waiting for gas to be filled, and the system returns to S2a after filling the gas;

[0080] S15b: If the gas reserve amount is greater than 30%, gas is sprayed toward the spraying component 9.

[0081] In the steps S2-S3, when the driving component drives the stirring component to move up and down, the following steps are also included:

[0082] A1: The rack 4 in the driving component drives the piston rod to move synchronously, and the air pump 7 fills the connected air storage device 8 with gas;

[0083] A2: The gas storage device 8 stores the gas charged by the gas pump 7.

[0084] When a bronze-clad-iron composite iron powder manufacturing device and method are used to manufacture a bronze-clad-iron composite iron powder, an operator is used as an executor of the method and an operator of the device.

[0085] When the operator first operates, after preparing iron powder, tin powder and copper sulfate solution, the gas wall device is started. The gas storage device 8 determines that the gas reserve is greater than 30%. The gas storage device 8 releases the existing gas to the jet component 9. The jet component 9 sprays the gas to the upper end of the reactor 14. The sprayed gas forms a gas wall at the upper end of the reactor 14, and the horizontal range of the upper end of the reactor 14 is covered by the gas wall. After the reactor 14 completely releases the solid-liquid mixture, when the reactor 14 is closed again, the gas wall device is closed.

[0086] When the operator operates for the first time, after the motor 1 is started, the rack 4 moves downward with the piston rod connected to the nut. When the rack 4 moves upward again, the air pump 7 fills a large amount of gas into the air storage device 8, and the air storage device 8 receives and stores the gas filled by the air pump 7.

[0087] When the operator operates for the second time, the solid-liquid reaction device is started and then the gas wall device is started. The gas storage device 8 determines that the gas reserve is less than 30%. The operator removes the gas storage device 8 and fills the gas reserve in the gas storage device 8 to 50%, and then connects the gas storage device 8 to the air charging pump 7 and the jet component 9. The gas storage device 8 determines that the gas reserve is greater than 30%, and the gas storage device 8 releases the stored gas to the jet component 9 until the reaction kettle 14 is closed again, and the gas wall device is closed.

[0088] Example 3

[0089] The difference between this embodiment and embodiment 2 is that: it also includes a continuous stirring device, which includes a cylinder and a second driving rod 17 driven by the cylinder (the cylinder piston rod is nut-connected to the second driving rod 17), the outer wall of the second driving rod 17 is provided with a thread, the second driving rod 17 is provided with a second stirring component, the second driving rod 17 is threadedly connected to the second sleeve 6, the cylinder and the second sleeve 6 are both arranged on the frame (the outer wall of the cylinder and the outer wall of the sleeve 6 are nut-connected to the frame), the continuous stirring device is arranged on the frame above the reactor 14 (the second stirring component of the continuous stirring device is suspended in the reactor 14), and the piston rod is fixedly connected to the air pump 7 (the cylinder piston rod is nut-connected to the piston rod of the air pump 7).

[0090] During specific implementation, an operator is used as an operator of the continuous stirring device.

[0091] After the operator puts the copper sulfate solution into the reactor in the actual production of the prior art, the continuous stirring device is started, and then the cylinder piston rod drives the second driving rod 17 to move in the vertical direction, and the second sleeve 6 causes the second driving rod 17 to move up and down while rotating and stirring the solid-liquid mixture. After the operator closes the cylinder, the reactor in the actual production of the prior art releases the solid-liquid mixture.

[0092] Comparative Example

[0093] In this scheme, the production raw materials are prepared according to the ratio of 5:4:1 of the mass ratio of iron, copper and tin in the composite powder: 200kg iron powder, 100kg copper sulfate solution and 10kg tin powder; copper-clad iron powder is prepared by using any one of the devices in Example 2, and the prepared copper-clad iron powder is mixed with the prepared tin powder to obtain sample a, bronze-clad iron powder is prepared by using any one of the devices in Example 2 as sample b, and copper-clad iron powder is prepared by using any one of the devices in Example 2 as sample c; the same micro parts are made by using sample a, sample b and sample c, and 3 groups are made respectively; the hardness, plasticity, friction reduction and corrosion resistance of the micro parts of each of the three samples are tested, and the test results shown in Table 1 are obtained:

[0094]

[0095] From the test results in Table 1, we can see that:

[0096] (1) The hardness, plasticity, friction reduction and corrosion resistance of copper-coated iron powder (sample c) are not as good as those of bronze-coated iron powder (sample a);

[0097] (2) Copper-clad iron powder mixed with tin powder (sample b) has better hardness, plasticity, friction reduction, and corrosion resistance than copper-clad iron powder, but there is segregation, which will affect the production of tiny parts (the third group of sample b has segregation);

[0098] (3) Bronze-coated iron powder (sample a) has better hardness, plasticity, friction reduction, and corrosion resistance than copper-coated iron powder (sample c), is less likely to segregate, and can produce micro-parts with more stable quality than copper-coated iron powder mixed with tin powder (sample b).

[0099] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A bronze-clad iron composite iron powder manufacturing device, comprising: A solid-liquid reaction device, a solid-liquid separation and drying device, a reduction device and a diffusion device, wherein the solid-liquid reaction device, the solid-liquid separation and drying device, the reduction device and the diffusion device are connected in sequence, and characterized in that they also include: The solid-liquid reaction device comprises a reactor, a frame, a sleeve and a stirring device, wherein the reactor and the stirring device are both fixed on the frame; the stirring device comprises a stirring component and a driving component for driving the stirring component, wherein the driving component comprises a motor and a gear coaxially connected to an output shaft of the motor, wherein the gear is meshed with a rack, wherein the rack is rotatably connected to a driving rod, wherein an outer wall of the driving rod is provided with an external thread, and an inner thread is provided on the sleeve, wherein the sleeve is threadedly connected to the driving rod, wherein the sleeve is fixedly connected to the frame, and wherein the stirring component is arranged on the driving rod; The solid-liquid reaction device also includes a gas wall device, which includes an air pump and an air jet component. The air pump is used to inject air into the air jet component, and the air outlet of the air jet component is arranged at the upper end of the reactor; The air wall device also includes an air storage device, the air inlet of the air storage device is connected to the air outlet of the air pump, the air outlet of the air storage device is connected to the air inlet of the jet component, and when the rack moves upward, the air pump fills the air storage device with gas; A pressure detection device is provided in the reactor. The pressure detection device is embedded in the inner wall of the reactor and is closest to the liquid level when the substitution reaction between iron powder and copper sulfate solution is complete, and a position where pressure data cannot be read.

2. The bronze-clad-iron composite iron powder manufacturing device according to claim 1, characterized in that: A bronze-clad-iron composite iron powder manufactured by a bronze-clad-iron composite iron powder manufacturing device is a composite powder consisting of iron, copper and tin, wherein the mass ratio of the iron, copper and tin is 5:4:

1.

3. The bronze-clad-iron composite iron powder manufacturing device according to claim 1, characterized in that: The distance between the gear and the sleeve is greater than the length of the rack and less than the distance between the gear and the stirring component.

4. The bronze-clad-iron composite iron powder manufacturing device according to claim 1, characterized in that: The rack is slidably connected to a limiting component, and the sleeve is fixedly connected to the limiting component.

5. A method for manufacturing bronze-clad-iron composite iron powder using the bronze-clad-iron composite iron powder manufacturing device according to claim 1, characterized in that: The bronze-clad iron composite iron powder manufacturing device according to claim 1 comprises the following steps: S10: preparing iron powder, tin powder and copper sulfate solution according to the mass ratio of iron, copper and tin; S20: putting the copper sulfate solution into the reactor, starting the solid-liquid reaction device, driving the stirring component to rotate and move downward while rotating and stirring the copper sulfate solution, and adding the prepared iron powder after the stirring device is turned on, and the iron powder is added to the copper sulfate solution to undergo a replacement reaction with the copper sulfate solution; S30: After the rack moves to the maximum range of movement, the stirring device stops moving and rotating. After the reactor is left to stand until the liquid level does not change, the pressure detection device reads the pressure data. If: S30a: The pressure detection device reads the pressure data, and the driving component drives the stirring component to move in the opposite direction of the previous movement direction and rotate and stir, and S30 is executed again; S30b: The pressure detection device does not read the pressure data, and the solid-liquid mixture is released from the reactor; S40: sending the solid-liquid mixture to a separation and drying device and a reduction device, and obtaining copper-coated iron powder by separation, drying, and introduction of hydrogen for reduction reaction. Then, the copper-coated iron powder is sent to a diffusion device and the prepared tin powder is added. The tin powder diffuses and fuses with copper in the diffusion device to obtain bronze-coated iron powder.

6. The method for manufacturing bronze-clad iron composite iron powder according to claim 5, characterized in that: Between the steps S10 and S20, the following steps are also included: S15: Start the gas wall device, and the gas storage device determines the gas reserve amount, if: S15a: If the gas reserve is less than or equal to 30%, a prompt tone is sounded, waiting for gas to be filled, and the system returns to S15 after filling the gas; S15b: If the gas reserve is greater than 30%, gas is ejected toward the jetting component.

7. The method for manufacturing bronze-clad iron composite iron powder according to claim 6, characterized in that: In the steps S20-S30, when the driving component drives the stirring component to move up and down, the following steps are also included: A1: The rack in the driving component drives the piston rod to move synchronously, and the air pump fills the connected air storage device with gas; A2: The gas storage device stores the gas filled by the air pump.

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