Water stop angle valve body forming process and forming equipment thereof

Abstract

The invention belongs to the technical field of valve body manufacturing, and particularly relates to a water stop angle valve body forming process and forming equipment thereof.The water stop angle valve body forming process comprises the following steps that S1, stainless steel powder and plastic particles are prepared and mixed through an internal mixer; s2, heating the mixture at 160-220 DEG C to form a molding material with fluidity, and injecting the molding material into a mold for injection molding to obtain a green body; s3, the green body is heated to 600-700 DEG C, atomized oxalic acid is injected at the same time, catalytic degreasing is conducted to remove plastic particles in the green body, and nitrogen is introduced to exhaust waste gas; s4, the green body obtained after catalytic degreasing is fed into a sintering furnace, the temperature in the furnace is controlled to range from 1100 DEG C to 1500 DEG C in the vacuum environment, the green body is heated and cured, and protective gas is injected into the furnace; s5, a valve body of the water stop angle valve is obtained after cooling; catalytic degreasing is carried out by adopting oxalic acid and a heating environment, the operation is simple, the relative cost is relatively low, complicated equipment and process are not needed, integral forming is realized, and the possibility of possible leakage is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of valve body manufacturing, and in particular relates to a valve body molding process and molding equipment of a water stop angle valve. Background Art

[0002] Angle water-stop valve is the abbreviation of angle valve with water-stop function. In addition to the water inlet end, water outlet end and the main part for installing valve core and other components, the valve body is also provided with a snap joint for installing water-stop core and connecting water pipe. The snap joint of traditional stainless steel angle water-stop valve is usually threadedly connected to the water outlet end of the valve body, that is, the valve body and the snap joint are manufactured separately and then connected, which can easily affect the sealing between the water outlet end of the valve body and the snap joint, and there is a risk of leakage.

[0003] For example, Chinese patent publication number (CN109894618A) discloses a high-strength blended chair rocking gear part and a method for making the same, which is prepared by mixing metal powder and a binder to form granules, and then injection molding the preforms through an injection mold, and then placing the preforms into an extraction liquid to remove the binder, and finally sintering the preforms in a sintering furnace to obtain an integrally formed workpiece, but the cost of the extractant is high, and special equipment and processes are required for the extraction operation. Summary of the invention

[0004] The purpose of the present invention is to provide a water stop angle valve body forming process and forming equipment thereof in order to solve the above-mentioned technical problems, so as to achieve the effect of simple operation and low cost.

[0005] In view of this, the present invention provides a water stop angle valve body forming process, comprising the following steps: S1: Stainless steel powder and plastic granules are batched and mixed by an internal mixer; S2: heating the mixed material at 160°C-220°C to form a fluid plastic material, and injecting it into a mold for injection molding to obtain a green body; S3: heating the green body to 600°C-700°C, injecting atomized oxalic acid to perform catalytic degreasing to remove plastic particles in the green body, and introducing nitrogen to discharge waste gas; S4: The green body after catalytic debinding is sent into a sintering furnace, the temperature in the furnace is controlled to be 1100°C-1500°C in a vacuum environment, the green body is heated and solidified, and a protective gas is injected into the furnace; S5: After cooling, the water stop angle valve body is obtained.

[0006] In the above technical solution, further: Stainless steel powder includes C, O, Si, S, P, Mn, Cr, Ni, Fe; The plastic particles are a polyoxymethylene mixture.

[0007] In the above technical solution, further: The shielding gas in S4 is nitrogen and argon or a mixture of the two.

[0008] The present invention provides a forming device for a water stop angle valve body forming process, comprising: Internal mixer for batching and mixing stainless steel powder and plastic granules; An injection molding machine, comprising an injection mechanism and a mold mechanism, and used for molding a green body; The debinding furnace comprises a furnace body, a supporting mechanism installed in the furnace body, a heating mechanism, a nitrogen supply mechanism and a spraying mechanism, and is used for catalytic debinding of green bodies; The sintering furnace is used to heat and solidify the green body after catalytic degreasing, and is connected with a vacuum extraction mechanism.

[0009] In the above technical solution, further, it also includes: A rotating shaft is axially mounted in the furnace body and has a plurality of supporting plates arranged around its circumference; A driving assembly is installed on the side of the furnace body and is used to drive the rotating shaft to rotate; The trigger assembly is installed on the side of the furnace body and is used to trigger the spray mechanism to spray the furnace body intermittently and is triggered by the drive assembly; Among them, a plurality of supporting mechanisms are arranged in the furnace body, and include a plug-in plate plugged with the supporting plate and a bracket installed on the plug-in plate for supporting and fixing the workpiece.

[0010] In the above technical solution, further, the trigger component includes: A shell is installed on the side of the furnace body, and a first electrode block and a second electrode block are respectively embedded on two inner walls opposite to each other in the shell; A movable block is slidably connected to the inner walls on both sides of the housing, and comprises a driven part and a triggering part for triggering the first electrode block to be electrically connected to the second electrode block; A driving block is mounted on the rotating shaft and is used to follow the rotating shaft to rotate clockwise or counterclockwise; The first elastic member is installed in the housing and is slidably connected with the movable block in the horizontal direction and is used for slowly resetting the movable block after vertical lifting; The second elastic member is installed in the housing and is slidably connected with the movable block in the vertical direction and is used for slowly resetting the movable block after horizontal movement; When the driving block rotates clockwise or counterclockwise following the rotating shaft, it drives the movable block to be vertically lifted or to move horizontally away from the driving block respectively. When lifted vertically, the trigger part is separated from the first electrode block and the second electrode block. When moved horizontally, the trigger part is contacted and connected with the first electrode block and the second electrode block. After resetting in the vertical direction or the horizontal direction, the trigger part is released from contact with the first electrode block and the second electrode block.

[0011] In the above technical solution, further: The trigger part is located between the first electrode block and the second electrode block, and the resetting force of the first elastic member and the second elastic member is greater than the static friction between the trigger part and the first electrode block and the second electrode block, and can slowly reset the movable block; The distance dimension of the movable block to be reset in the horizontal direction is greater than the length dimension of the triggering part and the first electrode block and the second electrode block that can be in contact and connected in the horizontal direction.

[0012] In the above technical solution, further, the spray mechanism includes: A spray pipe is installed in the furnace body, and a plurality of atomizing nozzles are installed on the surface and connected to the spray pipe; A first input pipe is installed on the side of the furnace body and is used to transport oxalic acid into the spray pipe; The solenoid valve is used to control the opening and closing between the first input pipe and the spray pipe, and is triggered by the trigger component; A venturi tube, mounted on the first input pipe; A connecting pipe, one end of which is connected to the nitrogen supply mechanism, and the other end of which is connected to the venturi tube; The automatic control valve is installed on the connecting pipe and opens and closes following the opening and closing of the solenoid valve; Among them, when the solenoid valve is opened, the automatic control valve is opened, and when the solenoid valve is closed, the automatic control valve is closed.

[0013] In the above technical solution, further, the automatic control valve includes: A valve body connected to the connecting pipe; The valve core is installed in the valve body and abuts against a side of the valve body close to the nitrogen supply mechanism; A spring is installed in the valve body and is used to abut the valve core against a side of the valve body close to the nitrogen supply mechanism; Among them, the force exerted by the air pressure of the nitrogen supply mechanism entering the connecting pipe on the valve core is smaller than the force exerted by the spring on the valve core, and the sum of the force exerted by the negative pressure generated by the venturi tube at one end of the connecting pipe on the valve core and the force exerted by the air pressure of the nitrogen supply mechanism entering the connecting pipe on the valve core is greater than the force exerted by the spring on the valve core.

[0014] In the above technical solution, further: The furnace body comprises an inner furnace wall and an outer furnace wall, an inner chamber is formed in the inner furnace wall, a sandwich is formed between the inner furnace wall and the outer furnace wall, and an air outlet pipe is connected to the high inner wall of the inner chamber; The nitrogen supply mechanism includes a gas supply source and a second input pipe, and the second input pipe enters the interlayer and is arranged spirally around the inner furnace wall; Wherein, one end of the second input pipe away from the air supply source passes through the lower inner wall of the inner chamber and communicates with the inner chamber, and one end of the connecting pipe is connected to the first input pipe.

[0015] The beneficial effects of the present invention are: 1. The green body is obtained by injection molding using stainless steel powder and plastic particles as a binder as raw materials, and then catalytically degreasing it by injecting atomized oxalic acid in a high temperature environment of 600℃-700℃, and finally sent to a sintering furnace for heating and curing, so as to realize the one-piece molding of the complex structure of the water stop angle valve body, and eliminate the possible leakage between the water outlet end of the valve body and the snap joint; and the catalytic degreasing by using oxalic acid and a heated environment is simple to operate, relatively low in cost, and does not require complex equipment and processes; 2. By setting a rotating shaft and rotating the rotating shaft under the action of a driving component, the workpiece in the degreasing furnace is rotated, thereby effectively improving the uniformity of spraying oxalic acid on the workpiece and the uniformity of heating the workpiece, and effectively improving the effect of catalytic degreasing; 3. While the driving component drives the rotating shaft to rotate, the trigger component can be triggered according to the forward and reverse rotation, so as to achieve intermittent spraying of the spray mechanism, that is, it can improve the utilization rate of oxalic acid, avoid the waste of oxalic acid, and further reduce the cost; 4. The movable block is pushed to move by the driving block following the rotation of the shaft, and is slowly reset under the action of the first elastic member and the second elastic member. That is to say, the opening and closing of the spray mechanism can correspond to the forward and reverse rotation of the shaft, which has a good control effect and improves convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the degreasing furnace of the present invention; Figure 3 is a partial cross-sectional view of the degreasing furnace of the present invention; Figure 4 It is a schematic diagram of the structure of the trigger component of the present invention; Figure 5 It is a schematic diagram of different positions of the active block of the trigger component of the present invention; Figure 6 It is a partial schematic diagram of the spray mechanism of the present invention; The symbols in the figure are as follows: 1, internal mixer; 2, injection molding machine; 20, injection mechanism; 21, mold mechanism; 3, degreasing furnace; 4, furnace body; 40, inner furnace wall; 41, outer furnace wall; 42, inner chamber; 43, interlayer; 44, air outlet pipe; 5, supporting mechanism; 50, plug board; 51, bracket; 6, heating mechanism; 7, spray mechanism; 70, spray pipe; 71, atomizing nozzle; 72, first input pipe; 73, solenoid valve; 74, venturi tube; 75, connecting pipe; 76, venturi tube; 77, venturi tube; 78, venturi tube; 79, venturi tube; 80, venturi tube; 81, venturi tube; 82, venturi tube; 83, venturi tube; 84, venturi tube; 85, venturi tube; 86, venturi tube; 87, venturi tube; 88, venturi tube; 89, venturi tube; 90, venturi tube; 91, venturi tube; 92, venturi tube; 93, venturi tube; 94, venturi tube; 95, venturi tube; 96, venturi tube; 97, venturi tube; 98, venturi tube; 99, venturi tube; 100, venturi tube; 101, venturi tube; 102, venturi tube; 103, venturi tube; 104, venturi tube; 105, venturi tube; 106, venturi tube; 107, venturi tube; 108, venturi tube; 109, venturi tube; 110, venturi tube; 111, venturi tube; 112, vent 6. Automatic control valve; 760. Valve body; 761. Valve core; 762. Spring; 8. Sintering furnace; 9. Vacuum extraction mechanism; 10. Rotating shaft; 11. Support plate; 12. Driving assembly; 13. Triggering assembly; 130. Shell; 131. First electrode block; 132. Second electrode block; 133. Movable block; 1330. Follower; 1331. Triggering section; 134. Driving block; 135. First elastic member; 136. Second elastic member; 14. Second input pipe. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0018] Embodiment 1: This embodiment provides a water stop angle valve body forming process, comprising the following steps: S1: Stainless steel powder and plastic granules are batched and mixed by an internal mixer; S2: heating the mixed material at 160°C-220°C to form a fluid plastic material, and injecting it into a mold for injection molding to obtain a green body; S3: heating the green body to 600°C-700°C, injecting atomized oxalic acid to perform catalytic degreasing to remove plastic particles in the green body, and introducing nitrogen to discharge waste gas; S4: The green body after catalytic debinding is sent into a sintering furnace, the temperature in the furnace is controlled to be 1100°C-1500°C in a vacuum environment, the green body is heated and solidified, and a protective gas is injected into the furnace; S5: After cooling, the water stop angle valve body is obtained.

[0019] It can be seen from the present embodiment that a green body is obtained by injection molding using stainless steel powder and plastic particles as a binder as raw materials, which is then catalytically degreased by injecting atomized oxalic acid in a high temperature environment of 600°C-700°C, and finally sent to a sintering furnace for heating and curing, thereby achieving one-piece molding of the complex structure of the water-stop angle valve body, eliminating possible leakage between the water outlet end of the valve body and the snap joint; and by using oxalic acid and a heated environment for catalytic degreasing, the operation is simple, the cost is relatively low, and no complicated equipment and processes are required.

[0020] Embodiment 2: This embodiment provides a water stop angle valve body forming process, which, in addition to the technical solutions of the above embodiments, also has the following technical features: Stainless steel powder includes C, O, Si, S, P, Mn, Cr, Ni, Fe; The plastic particles are a polyoxymethylene mixture.

[0021] It can be seen from this embodiment that stainless steel powder and a polyoxymethylene mixture are used as the plastic particles used as the binder. During production, nitrogen can take the generated waste gas out of the degreasing furnace, and polyoxymethylene is decomposed by heat to produce formaldehyde, carbon dioxide and water, and oxalic acid is decomposed by heat to produce carbon dioxide and water, which has little impact on the production environment and can achieve large-scale clean production. In addition, the one-piece water-stop angle valve body formed of stainless steel has high structural strength, good surface finish, high product precision, and after sintering in a sintering furnace, the valve body has high density, good internal structural uniformity, and no internal stress and segregation.

[0022] Embodiment 3: This embodiment provides a water stop angle valve body forming process, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The shielding gas in S4 is nitrogen and argon or a mixture of the two.

[0023] It can be seen from this embodiment that by using one or a mixture of nitrogen and argon as the protective gas, it can achieve good anti-oxidation effect, sintering effect and surface performance, thereby ensuring the smoothness of the valve body surface and product precision. In addition, argon as a protective gas can improve the density and uniformity of the material, make the particles more closely combined, and improve the density and mechanical properties of the material.

[0024] Embodiment 4: This embodiment provides a molding device for a water stop angle valve body molding process, including: Internal mixer 1, used for batching and mixing stainless steel powder and plastic granules; An injection molding machine 2, comprising an injection mechanism 20 and a mold mechanism 21, and used for molding a green body; The debinding furnace 3 comprises a furnace body 4, a supporting mechanism 5 installed in the furnace body 4, a heating mechanism 6, a nitrogen supply mechanism and a spray mechanism 7, and is used for catalytic debinding of green bodies; A sintering furnace 8 is used to heat and solidify the green body after catalytic degreasing, and is connected to a vacuum pumping mechanism 9; Among them, the specific structures of the heating mechanism 6 in the internal mixer 1, injection molding machine 2, sintering furnace 8 and degreasing furnace 3 are all existing mature technologies, and the heating mechanism 6 can be heated by resistance wire, which is known to technicians in the relevant field from traditional internal mixers 1, injection molding machines 2, sintering furnace 8 and degreasing furnace 3, and will not be repeated here.

[0025] It can be seen from this embodiment that by using the spray mechanism 7 in the degreasing furnace 3, oxalic acid can be evenly sprayed on the surface of the green body, effectively improving the uniformity of catalytic degreasing of multiple green bodies and ensuring product quality.

[0026] Embodiment 5: This embodiment provides a molding device for a water stop angle valve body molding process, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: The rotating shaft 10 is axially mounted in the furnace body 4 and is provided with a plurality of supporting plates 11 on the circumference; A driving assembly 12 is installed on the side of the furnace body 4 and is used to drive the rotating shaft 10 to rotate; The trigger assembly 13 is installed on the side of the furnace body 4 and is used to trigger the spray mechanism 7 to intermittently spray the furnace body 4, and is triggered by the driving assembly 12; The supporting mechanism 5 is provided in plurality in the furnace body 4 and includes a plug-in plate 50 plugged into the supporting plate 11 and a bracket 51 installed on the plug-in plate 50 for supporting and fixing the workpiece; Meanwhile, the drive assembly 12 may be a motor; The connection between the support plate 11 and the plug plate 50 is specifically that a slide groove is provided on the support plate 11, and the plug plate 50 is slidably connected with the slide groove, and the bracket 51 can be a tree branch type, and the valve body of the water stop angle valve is fixed by a locking member after passing through the tree branch, and the specific locking member can be a locking block threadedly connected with the tree branch; Four support plates 11 may be used and arranged at equal intervals on the circumference, and the slide grooves may be arranged on both sides of the support plate 11 , that is, eight plug plates 50 are arranged on the circumference, and a plurality of brackets 51 are arranged on the plug plates 50 at equal intervals.

[0027] It can be seen from this embodiment that by providing the rotating shaft 10 and rotating the rotating shaft 10 under the action of the driving assembly 12, the workpiece in the degreasing furnace 3 is rotated, thereby effectively improving the uniformity of spraying oxalic acid on the workpiece and the uniformity of heating the workpiece, and effectively improving the effect of catalytic degreasing; The use of the slide grooves on the plug plate 50 and the support plate 11 for plugging can effectively improve the convenience of loading, and the water stop angle valve body is placed on the tree branch-shaped bracket 51 and locked by a threaded locking block. This can improve the convenience of installing the valve body 760 and ensure stability during rotation, thereby ensuring the uniformity of oxalic acid spraying by the spray mechanism 7.

[0028] Embodiment 6: This embodiment provides a molding device for a water stop angle valve body molding process, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The trigger component 13 includes: The shell 130 is installed on the side of the furnace body 4, and a first electrode block 131 and a second electrode block 132 are respectively embedded on two opposite inner walls of the shell 130; The movable block 133 is slidably connected to the inner walls on both sides of the housing 130 and includes a driven part 1330 and a triggering part 1331 for triggering the first electrode block 131 to be electrically connected to the second electrode block 132; The driving block 134 is mounted on the rotating shaft 10 and is used to rotate clockwise or counterclockwise with the rotating shaft 10; The first elastic member 135 is installed in the housing 130 and is slidably connected with the movable block 133 in the horizontal direction and is used for slowly returning the movable block 133 after being vertically lifted; The second elastic member 136 is installed in the housing 130 and is slidably connected to the movable block 133 in the vertical direction and is used for slowly resetting the movable block 133 after horizontal movement; When the driving block 134 rotates clockwise or counterclockwise following the rotating shaft 10, the movable block 133 is driven to be vertically lifted or horizontally moved away from the driving block 134, and when it is vertically lifted, the triggering part 1331 is separated from the first electrode block 131 and the second electrode block 132, and when it is horizontally moved, the triggering part 1331 is in contact with the first electrode block 131 and the second electrode block 132, and after being reset in the vertical direction or the horizontal direction, the triggering part 1331 is released from contact with the first electrode block 131 and the second electrode block 132; The first elastic member 135 and the second elastic member 136 can both adopt abutment plates and a plurality of springs 762, and the first electrode block 131 and the second electrode block 132 can serve as two contacts of the start switch of the spray mechanism 7, and the trigger part 1331 serves as the switch blade.

[0029] It can be seen from the present embodiment that the spray mechanism 7 is started and closed by using the triggering part 1331 to conduct and separate the first electrode block 131 and the second electrode block 132, and the driving block 134 follows the rotation of the rotating shaft 10 to push the movable block 133 to drive the movement of the triggering part 1331, so that the control of the spray mechanism 7 can be converted into the forward and reverse rotation of the rotating shaft 10, so that the intermittent spraying of the spray mechanism 7 can be controlled by changing the rotation direction, which effectively improves the convenience of control; After the driving block 134 drives the movable block 133 to move, it can be slowly reset under the action of the first elastic member 135 and the second elastic member 136. On the one hand, it can reduce the force of the driving block 134 on the movable block 133 after the first push, and reduce the impact of the abutment between the driving block 134 and the movable block 133 on the rotation of the rotating shaft 10. On the other hand, it can avoid the disconnection of the contact between the trigger part 1331 and the first electrode block 131 and the second electrode block 132, that is, avoid frequent contact and disconnection between the trigger part 1331 and the first electrode block 131 and the second electrode block 132, avoid frequent startup of the spray mechanism 7 in a short time, and ensure the control of intermittent spraying. At the same time, the driving block 134 is rotated in different directions to abut against and push the driven portion 1330 of the movable block 133. Specifically, it is assumed that when the trigger portion 1331 is located on the right side of the rotating shaft 10, and the driven portion 1330 extends from the trigger portion 1331 to one side of the rotating shaft 10 and is located above the rotating shaft 10; When the driving block 134 rotates clockwise along with the rotating shaft 10, the driving block 134 will abut against the end of the driven part 1330 away from the triggering part 1331, and push the movable block 133 to move rightward, so that the triggering part 1331 is in contact with the first electrode block 131 and the second electrode block 132, and the spray mechanism 7 is started. After the driving block 134 rotates past the driven part 1330, it is separated from the driven part 1330, and the movable block 133 slowly moves toward the rotating shaft 10 under the action of the second elastic member 136. When the driving block 134 rotates again and abuts against the driven part 1330, it will push the movable block 133 to compress the second elastic member 136 again, and this is repeated, so that the triggering part 1331 is always in contact with the first electrode block 131 and the second electrode block 132, thereby realizing the continuous opening of the spray mechanism 7. When the driving block 134 follows the shaft 10 and then stops and then reverses counterclockwise, the movable block 133 slowly moves toward the side of the shaft 10 under the action of the second elastic member 136, and the counterclockwise reverse rotation of the driving block 134 does not abut against the end of the driven portion 1330 away from the trigger portion 1331, but abuts against the bottom of the driven portion 1330. That is to say, as the driving block 134 reverses counterclockwise, the movable block 133 is urged to move upward and compress the first elastic member 135, thereby causing the trigger portion 1331 to contact the first electrode block 131 and the second electrode block 1331. The electrode block 132 is released from contact and the spray mechanism 7 is closed. When the second elastic member 136 is not completely reset, the movable block 133 will be repeatedly pushed and lifted by the driving block 134 to prevent the trigger part 1331 from contacting and connecting with the first electrode block 131 and the second electrode block 132 again, thereby effectively ensuring the closure of the spray mechanism 7. That is, by controlling the forward and reverse rotation of the rotating shaft 10, the opening and closing of the spray mechanism 7 are controlled in conjunction. There is no need for an additional control unit to control the opening and closing of the spray mechanism 7, thereby effectively improving the convenience of control.

[0030] Embodiment 7: This embodiment provides a molding device for a water stop angle valve body molding process, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The triggering part 1331 is located between the first electrode block 131 and the second electrode block 132, and the restoring force of the first elastic member 135 and the second elastic member 136 is greater than the static friction between the triggering part 1331 and the first electrode block 131 and the second electrode block 132, and can slowly restore the movable block 133; The distance dimension of the movable block 133 being reset in the horizontal direction is greater than the length dimension of the triggering part 1331 being able to contact and connect with the first electrode block 131 and the second electrode block 132 in the horizontal direction; At the same time, the first electrode block 131 and the second electrode block 132 both slightly protrude from the surface of the inner wall of the shell 130, and the trigger part 1331 will be stuck between the two, thereby generating static friction between the trigger part 1331 and the first electrode block 131 and the second electrode block 132, and the movable block 133 is slowly reset under the action of the second elastic member 136. Similarly, a protrusion is provided on the inner wall of the shell 130 located on the first elastic member 135, which is used to realize the slow reset of the movable block 133 under the action of the first elastic member 135.

[0031] It can be seen from the present embodiment that the trigger part 1331 is caused to reset slowly under the action of the second elastic member 136 by using the static friction force generated by the trigger part 1331 being stuck between the first electrode block 131 and the second electrode block 132, so as to ensure that the trigger part 1331 will not be released from contact with the first electrode block 131 and the second electrode block 132 in the gap between the trigger part 1331 and the driven part 1330 twice in a row; and the reset distance dimension in the horizontal direction is greater than the length dimension of the first electrode block 131 and the second electrode block 132 in contact with the trigger part 1331 in the horizontal direction, so as to ensure that after the trigger part 1331 is completely reset in the horizontal direction, the contact between the trigger part 1331 and the first electrode block 131 and the second electrode block 132 can be released, so as to ensure that the spray mechanism 7 is closed; Similarly, the slow resetting in the vertical direction can allow the movable block 133 to slowly fall after being lifted by the driving block 134, thereby avoiding the situation in which, at the initial stage of the forward and reverse switching of the rotating shaft 10, the trigger part 1331 has not yet been reset in the vertical direction to the length of the first electrode block 131 and the second electrode block 132 in the horizontal direction. If it is quickly reset, it will cause the trigger part 1331 to re-contact and connect with the first electrode block 131 and the second electrode block 132, thereby effectively ensuring the timely and continuous closure of the spray mechanism 7.

[0032] Embodiment 8: This embodiment provides a molding device for a water stop angle valve body molding process, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the spray mechanism 7 includes: The spray pipe 70 is installed in the furnace body 4, and a plurality of atomizing nozzles 71 are installed on the surface and communicated with the spray pipe 70; A first input pipe 72 is installed on the side of the furnace body 4 and is used to transport oxalic acid into the spray pipe 70; The solenoid valve 73 is used to control the opening and closing between the first input pipe 72 and the spray pipe 70, and is triggered by the trigger component 13; A venturi tube 74 is installed on the first input pipe 72; A connecting pipe 75, one end of which is connected to the nitrogen supply mechanism, and the other end of which is connected to the venturi tube 74; The automatic control valve 76 is installed on the connecting pipe 75 and opens and closes following the opening and closing of the solenoid valve 73; When the solenoid valve 73 is opened, the automatic control valve 76 is opened, and when the solenoid valve 73 is closed, the automatic control valve 76 is closed; Meanwhile, the specific structures of the atomizing nozzle 71 and the solenoid valve 73 are both existing mature technologies, which are known to technicians in the relevant technical field from the traditional atomizing nozzle 71 and the solenoid valve 73, and will not be described in detail here.

[0033] It can be seen from this embodiment that by using a spray pipe 70 and a plurality of atomizing nozzles 71 as the spray mechanism 7, the oxalic acid solution is finely divided, and the oxalic acid solution is sprayed on the surface of the water stop angle valve body. In addition, the electromagnetic valve 73 is used to facilitate the opening and closing of the electromagnetic valve 73 by the trigger component 13, thereby improving convenience, and the structure is simple and easy to control. The arrangement of the venturi tube 74, the connecting pipe 75 and the automatic control valve 76 can introduce a small stream of nitrogen into the first input pipe 72 to mix with the oxalic acid solution when the spray mechanism 7 is opened. Since the temperature of the nitrogen is usually lower than that of the oxalic acid solution, the small stream of nitrogen is mixed with the oxalic acid solution and then sprayed through the atomizing nozzle 71, which can further improve the refinement effect and reduce the temperature of the atomized oxalic acid solution, thereby reducing the gasification of the oxalic acid solution caused by the high temperature in the degreasing furnace 3, and can increase the ease of oxalic acid to adhere to the surface of the water stop angle valve body far from the spray mechanism 7, thereby ensuring the catalytic degreasing effect. In addition, the arrangement of the automatic control valve 76 can close the connecting pipe 75 when the spray mechanism 7 is closed, thereby achieving a good control effect. At the same time, it is worth mentioning that the introduction of nitrogen causes the temperature of the oxalic acid solution to drop, which in turn causes the oxalic acid solution to crystallize. That is to say, the oxalic acid solution may crystallize at the atomizing nozzle 71 and cause the atomizing nozzle 71 to be blocked. Therefore, the spray pipe 70 and the plurality of atomizing nozzles 71 are all arranged in the furnace body 4, and the spray mechanism 7 adopts intermittent spraying, so that even if oxalic acid crystals are precipitated in the atomizing nozzle 71, they will be melted by the high temperature of the heating mechanism 6 and the furnace body 4, and will not cause blockage to the next spraying of the atomizing nozzle 71, thereby achieving a good self-cleaning effect.

[0034] Embodiment 9: This embodiment provides a molding device for a water stop angle valve body molding process. In addition to the technical solutions of the above embodiments, it also has the following technical features. The automatic control valve 76 includes: The valve body 760 is connected to the connecting pipe 75; The valve core 761 is installed in the valve body 760 and abuts against the side of the valve body 760 close to the nitrogen supply mechanism; The spring 762 is installed in the valve body 760 and is used to abut the valve core 761 against the side of the valve body 760 close to the nitrogen supply mechanism; The force exerted by the air pressure of the nitrogen supply mechanism entering the connecting pipe 75 on the valve core 761 is smaller than the force exerted by the spring 762 on the valve core 761, and the sum of the force exerted by the negative pressure generated by the venturi tube 74 at one end of the connecting pipe 75 on the valve core 761 and the force exerted by the air pressure of the nitrogen supply mechanism entering the connecting pipe 75 on the valve core 761 is greater than the force exerted by the spring 762 on the valve core 761. Meanwhile, the valve core 761 may be a spherical body.

[0035] It can be seen from the present embodiment that, through the above arrangement, when the first input pipe 72 is opened, a negative pressure is generated at the venturi tube 74, and the negative pressure and the air pressure of the nitrogen supply mechanism entering the connecting pipe 75 simultaneously act on the valve core 761, thereby prompting the valve core 761 to compress the spring 762 to open the connecting pipe 75, so that while the oxalic acid solution is input, a small amount of nitrogen can be prompted to enter the first input pipe 72 to mix with the oxalic acid solution, thereby reducing the temperature of the oxalic acid solution, ensuring that the oxalic acid solution can be evenly attached to the valve body surfaces of all water stop angle valves in the furnace body 4, thereby improving the catalytic degreasing effect; After the solenoid valve 73 is closed, the negative pressure is lost at the venturi tube 74, and the valve core 761 is closed instantly under the action of the spring 762 to prevent the nitrogen from continuing to enter the first input pipe 72, and the force of the air pressure of the nitrogen supply mechanism entering the connecting pipe 75 is toward the first input pipe 72. That is to say, when the negative pressure is lost, the air pressure of the nitrogen supply mechanism entering the connecting pipe 75 can temporarily block the oxalic acid solution from flowing to the side of the nitrogen supply mechanism, and then under the resetting action of the spring 762, the valve core 761 can be closed instantly, thereby preventing the oxalic acid solution from flowing to the nitrogen supply mechanism through the connecting pipe 75.

[0036] Embodiment 10: This embodiment provides a molding device for a water stop angle valve body molding process, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The furnace body 4 includes an inner furnace wall 40 and an outer furnace wall 41, wherein an inner chamber 42 is formed in the inner furnace wall 40, an interlayer 43 is formed between the inner furnace wall 40 and the outer furnace wall 41, and an air outlet pipe 44 is connected to the high inner wall of the inner chamber 42; The nitrogen supply mechanism includes a gas supply source and a second input pipe 14, and the second input pipe 14 enters the interlayer 43 and is arranged spirally around the inner furnace wall 40; Among them, one end of the second input pipe 14 away from the air supply source passes through the lower inner wall of the inner chamber 42 and communicates with the inner chamber 42, and one end of the connecting pipe 75 is connected to the first input pipe 72; At the same time, the number of turns of the second input pipe 14 spirally wrapped in the interlayer 43 can be controlled according to the preheating requirements; The gas supply source is a conventional nitrogen supply device, and its specific structure is prior art and is known to technicians in the relevant technical field from the conventional nitrogen supply device, so it will not be described in detail here.

[0037] It can be seen from this embodiment that when nitrogen is input into the inner chamber 42 through the second input pipe 14, it first flows around the inner furnace wall 40 in a spiral manner, which can achieve the effect of preheating the nitrogen, reduce the excessive fluctuation of the temperature of the inner chamber 42 caused by the injection of nitrogen into the inner chamber 42, improve the stability of the temperature of the inner chamber 42, and improve the stability of the catalytic degreasing; In addition, the nitrogen is spirally flowed around the inner furnace wall 40, which can reduce the heating of the high-temperature furnace on the external environment and effectively reduce the impact on the workshop temperature. Especially in the hot summer, improving the workshop temperature can effectively reduce the energy consumption of the refrigeration equipment in the workshop, achieving a better energy-saving and environmental protection effect; It is worth mentioning that compared with directly introducing nitrogen into the inner chamber 42, after the nitrogen is spirally flowed around the inner furnace wall 40, the nitrogen first exchanges heat with the heat at the inner furnace wall 40, and then enters the inner chamber 42 to exchange heat with the heat in the inner chamber 42, which can reduce the heat loss on the surface of the high-temperature furnace. However, the method of directly introducing nitrogen into the inner chamber 42 will cause the nitrogen to only exchange heat with the heat in the inner chamber 42, which undoubtedly increases the impact on the temperature in the inner chamber 42 and increases energy consumption.

[0038] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A water stop angle valve body forming process, characterized in that: The following steps are involved: S1: Stainless steel powder and plastic granules are batched and mixed by an internal mixer; S2: heating the mixed material at 160°C-220°C to form a fluid plastic material, and injecting it into a mold for injection molding to obtain a green body; S3: heating the green body to 600°C -700°C, injecting atomized oxalic acid to perform catalytic degreasing to remove plastic particles in the green body, and introducing nitrogen to discharge waste gas; S4: sending the green body after catalytic debinding into a sintering furnace, controlling the temperature in the furnace to 1100°C-1500°C in a vacuum environment, heating and curing the green body, and injecting protective gas into the furnace; S5: After cooling, the water stop angle valve body is obtained.

2. The process for forming a water stop angle valve body according to claim 1, characterized in that: The stainless steel powder includes C, O, Si, S, P, Mn, Cr, Ni, and Fe; The plastic particles are a polyoxymethylene mixture.

3. The process for forming a water stop angle valve body according to claim 1, characterized in that: The shielding gas in S4 is nitrogen and argon or a mixture of the two.

4. A molding device for a water stop angle valve body according to any one of claims 1 to 3, characterized in that: include: An internal mixer (1) for batching and mixing stainless steel powder and plastic granules; An injection molding machine (2) comprising an injection mechanism (20) and a mold mechanism (21), and used for molding a green body; A degreasing furnace (3) comprises a furnace body (4), a supporting mechanism (5) installed in the furnace body (4), a heating mechanism (6), a nitrogen supply mechanism and a spraying mechanism (7), and is used for catalytic degreasing of green bodies; The sintering furnace (8) is used to heat and solidify the green body after catalytic degreasing, and is connected to a vacuum extraction mechanism (9).

5. The molding equipment of the water stop angle valve body according to claim 4, characterized in that: Also includes: A rotating shaft (10) is axially mounted in the furnace body (4) and is provided with a plurality of supporting plates (11) on its circumference; A driving assembly (12) is mounted on a side of the furnace body (4) and is used to drive the rotating shaft (10) to rotate; A trigger assembly (13) is installed on the side of the furnace body (4) and is used to trigger the spray mechanism (7) to intermittently spray the furnace body (4) and is triggered by the drive assembly (12); The support mechanism (5) is provided in plurality in the furnace body (4), and comprises a plug plate (50) plugged into the support plate (11) and a bracket (51) mounted on the plug plate (50) for supporting and fixing the workpiece.

6. The molding equipment of the water stop angle valve body according to claim 5, characterized in that: The trigger component (13) comprises: A shell (130) is mounted on a side of the furnace body (4), and a first electrode block (131) and a second electrode block (132) are respectively embedded in two inner walls opposite to each other in the shell (130); A movable block (133) is slidably connected to the inner walls on both sides of the housing (130), and comprises a driven part (1330) and a triggering part (1331) for triggering the first electrode block (131) to be electrically connected to the second electrode block (132); A driving block (134) is mounted on the rotating shaft (10) and is used to rotate clockwise or counterclockwise along with the rotating shaft (10); A first elastic member (135) is installed in the housing (130) and is slidably connected to the movable block (133) in a horizontal direction and is used for slowly resetting the movable block (133) after vertical lifting; A second elastic member (136) is installed in the housing (130) and is slidably connected to the movable block (133) in a vertical direction and is used for slowly resetting the movable block (133) after horizontal movement; When the driving block (134) rotates clockwise or counterclockwise following the rotating shaft (10), it drives the movable block (133) to be lifted vertically or to move horizontally in a direction away from the driving block (134), and when lifted vertically, the triggering part (1331) is separated from the first electrode block (131) and the second electrode block (132); when moving horizontally, the triggering part (1331) is in contact and connection with the first electrode block (131) and the second electrode block (132); and after being reset in the vertical direction or the horizontal direction, the triggering part (1331) is released from contact with the first electrode block (131) and the second electrode block (132).

7. The molding equipment of the water stop angle valve body according to claim 6, characterized in that: The trigger part (1331) is located between the first electrode block (131) and the second electrode block (132), and the resetting force of the first elastic member (135) and the second elastic member (136) is greater than the static friction between the trigger part (1331) and the first electrode block (131) and the second electrode block (132), and can cause the movable block (133) to slowly relocate; The distance dimension of the movable block (133) being reset in the horizontal direction is greater than the length dimension of the contact connection between the trigger part (1331) and the first electrode block (131) and the second electrode block (132) in the horizontal direction.

8. The molding equipment of the water stop angle valve body according to claim 5, characterized in that: The spray mechanism (7) comprises: A spray pipe (70) is installed in the furnace body (4), and a plurality of atomizing nozzles (71) are installed on the surface and communicate with the spray pipe (70); A first input pipe (72) is installed on the side of the furnace body (4) and is used to transport oxalic acid into the spray pipe (70); A solenoid valve (73) for controlling the opening and closing of the first input pipe (72) and the spray pipe (70), and is triggered by a trigger assembly (13); A venturi tube (74) mounted on the first input pipe (72); A connecting pipe (75), one end of which is connected to the nitrogen supply mechanism, and the other end of which is connected to the venturi tube (74); The automatic control valve (76) is installed on the connecting pipe (75) and opens and closes following the opening and closing of the solenoid valve (73); When the solenoid valve (73) is opened, the automatic control valve (76) is opened, and when the solenoid valve (73) is closed, the automatic control valve (76) is closed.

9. The molding equipment of the water stop angle valve body according to claim 8, characterized in that: The automatic control valve (76) comprises: A valve body (760) connected to the connecting pipe (75); The valve core (761) is installed in the valve body (760) and abuts against a side of the valve body (760) close to the nitrogen supply mechanism; A spring (762) is installed in the valve body (760) and is used to make the valve core (761) abut against a side of the valve body (760) close to the nitrogen supply mechanism; The force exerted on the valve core (761) by the air pressure of the nitrogen supply mechanism entering the connecting pipe (75) is smaller than the sum of the force exerted on the valve core (761) by the spring (762) and the force exerted on the valve core (761) by the water pressure inside the connecting pipe (75) close to the first input pipe (72), and the sum of the force exerted on the valve core (761) by the negative pressure generated by the venturi tube (74) at one end of the connecting pipe (75) and the force exerted on the valve core (761) by the air pressure of the nitrogen supply mechanism entering the connecting pipe (75) is greater than the force exerted on the valve core (761) by the spring (762).

10. The molding equipment of the water stop angle valve body according to claim 8, characterized in that: The furnace body (4) comprises an inner furnace wall (40) and an outer furnace wall (41), an inner chamber (42) is formed in the inner furnace wall (40), an interlayer (43) is formed between the inner furnace wall (40) and the outer furnace wall (41), and an air outlet pipe (44) is connected to the high inner wall of the inner chamber (42); The nitrogen supply mechanism comprises a gas supply source and a second input pipe (14), wherein the second input pipe (14) enters the interlayer (43) and is arranged in a spiral manner around the inner furnace wall (40); The end of the second input pipe (14) away from the air supply source passes through the lower inner wall of the inner chamber (42) and communicates with the inner chamber (42), and one end of the connecting pipe (75) is connected to the first input pipe (72).

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