Impeller mold of centrifugal pump

Abstract

The utility model relates to the technical field of die equipment, in particular to an impeller die of a centrifugal pump, which comprises a base, a bottom die arranged on the base, a push rod arranged in the bottom die, a movable connecting rod arranged at the top of the bottom die, a sliding rod connected to the bottom of the movable connecting rod, an adjusting wheel connected to the sliding rod, and a guide rod connected to the adjusting wheel. A gear is arranged on the side wall of the push rod, a telescopic plate is arranged at the bottom of the gear, racks are arranged on the side wall of the push rod and the telescopic plate, the racks are in meshed connection with the gear, a grinding piece is arranged at the tail end of the telescopic plate and is parallel to the bottom die, an impeller cavity is formed in an upper cover of the bottom die, an upper die is connected to the upper cover of the impeller cavity, a cover plate is arranged at the top of the upper die, and a groove is formed in the bottom of the cover plate. And baffles are arranged on the side wall of the upper die and the side wall of the bottom die. Through linkage cooperation of the movable connecting rod, the guide rod, the push rod and the telescopic plate, the automatic demolding function of an impeller casting is achieved after the impeller mold of the centrifugal pump completes the casting and the cover plate is opened, and meanwhile the automatic grinding function can be completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of mold equipment, in particular to an impeller mold of a centrifugal pump. Background Art

[0002] A centrifugal pump is a machine for conveying liquid or pressurizing liquid. A centrifugal pump is mainly composed of a pump body and an impeller, so the production of impellers is a very important industrial technology. At present, casting molds are usually used for the rapid production of centrifugal pump impellers.

[0003] A Chinese patent with publication number CN113145831A discloses an impeller mold for a centrifugal pump, including a bottom box and a mold body. The bottom box is provided with a vertical plate, the vertical plate is provided with a top plate, the top plate is provided with a cooling mechanism and a reflux mechanism, and a driving motor is provided in the bottom box. The device can quickly cool down the mold base and the lower plate of the mold to reduce safety hazards, and at the same time can effectively control the thermal expansion of the mold and improve the molding quality of the impeller.

[0004] In the impeller mold of the above-mentioned centrifugal pump, after the impeller is formed, it is necessary to apply additional traction force to the impeller casting inside the cavity for demolding. The automatic demolding effect of the device is not good enough. At the same time, the impeller may produce burrs on the edges and surfaces during the molding process, which may affect the normal operation of the centrifugal pump. The device needs to be polished after demolding, which wastes time and the polishing efficiency is not high enough. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, the utility model proposes an impeller mold for a centrifugal pump. The technical solution adopted by the utility model to solve its technical problems is: the impeller mold for a centrifugal pump described in the utility model includes a base, a bottom mold is provided on the base, a push rod is provided inside the bottom mold, a movable connecting rod is provided on the top of the bottom mold, a sliding rod is slidably connected to the bottom of the movable connecting rod, a first spring is provided at the end of the sliding rod, an adjusting wheel is rotatably connected to the sliding rod, a guide rod is movably connected to the adjusting wheel, the top of the guide rod is movably connected to the push rod, a gear is provided on the outer side of the left and right side walls of the push rod, a telescopic plate is provided at the bottom of the gear, and racks are provided on the left and right side walls of the push rod and the telescopic plate, so that The rack is meshingly connected with the gear, the rack and the telescopic plate are staggered front and back, a grinding plate is provided at the end of the telescopic plate, the grinding plate is parallel to the bottom mold, an impeller cavity is provided on the bottom mold, the impeller cavity includes a plurality of fan blade grooves and a circular protrusion, a circumferential array of the fan blade grooves is distributed on the outside of the circular protrusion, an upper mold is connected to the upper cover of the impeller cavity, the outer wall of the upper mold is fitted with the inner wall of the impeller cavity, a cover plate is provided on the top of the upper mold, a groove corresponding to the movable connecting rod is opened at the bottom of the cover plate, baffles are provided on the side walls of the upper mold and the side walls of the bottom mold, and channels are formed between the baffles. The push rod inside the bottom mold can move left and right. When the push rod moves to the right and passes through the bottom of the impeller cavity and contacts the impeller casting in the impeller cavity, a rightward thrust is generated on the impeller casting, pushing the impeller casting to the side close to the upper mold and away from the bottom mold. The impeller casting falls under the influence of gravity and completes demoulding. A rack is provided at the bottom of the push rod, and the rack is meshed with a gear. The push rod moves left and right to drive the gear to rotate. The rotation of the gear further affects the movement state of the telescopic plate meshed with the gear. The movement of the telescopic plate drives the grinding sheet to move, and the blade side of the impeller casting mold is polished. The grinding process controls the movement of the cover plate to make the upper mold and the bottom mold contact or separate, and further drives the movement of the push rod and the grinding sheet, so that the mold can realize the automatic demolding function after the casting is completed. At the same time, the fan blade side of the impeller mold can be polished during the automatic demolding process. Subsequently, the push rod continues to push the impeller casting to the right under the influence of the spring reset inside the bottom mold and no longer contacts the grinding sheet. The impeller casting falls under the influence of gravity and falls into the baffle for surface grinding, thereby realizing the automatic demolding and automatic grinding functions of the impeller mold of the centrifugal pump.When using the impeller mold of the centrifugal pump, the cover plate is pushed to move to the left and the upper mold at the bottom of the cover plate is in contact with the bottom mold on the left. The impeller cavity shapes on the upper mold and the bottom mold are consistent, so that the upper mold and the bottom of the impeller cavity fit together. At this time, the groove opened on the cover plate fits with the movable connecting rod at the top of the bottom mold. The movement of the cover plate causes the groove to generate thrust on the movable connecting rod, and the movable connecting rod contracts inward and drives the slide rod to move to the left. The first spring provided at the bottom of the slide rod is squeezed and deformed. At the same time, the slide rod generates a force on the adjusting wheel, which causes the adjusting wheel to rotate and drives the guide rod to generate a leftward pulling force on the push rod. The push rod completely leaves the impeller cavity, and the impeller cavity and the upper mold form a closed space, which is convenient for the impeller casting mold work. When the push rod is pulled to the left by the guide rod, the rack at the bottom of the push rod moves to the left, and the gear meshing with the rack rotates and drives the telescopic plate meshing with the side to move outward. The telescopic plate is connected to the grinding sheet, so that the grinding sheet moves to both sides of the bottom mold to prevent the grinding sheet from blocking between the bottom mold and the upper mold and affecting the mold work. The casting is injected into the impeller cavity from the cover plate to start the mold casting. After the mold is completed, the motor drives the cover plate to open, the groove moves to the right and disengages from the movable connecting rod. The movable connecting rod is no longer subjected to the pressure of the groove. The first spring at the bottom of the slide rod resets and pushes the slide rod to the right. The slide rod drives the adjusting wheel to rotate in the opposite direction. The adjusting wheel rotating in the opposite direction drives the guide rod to generate a rightward thrust on the push rod. The push rod enters the impeller cavity from the bottom of the impeller cavity and presses against the bottom of the casting inside the impeller cavity, so that the casting moves to the right and disengages from the bottom mold, and the casting completes the demolding work. When the push rod is pushed to the right by the guide rod, the rack at the bottom of the push rod moves to the right, and the gear meshing with the rack rotates and drives the telescopic plate meshing with the side to move inward. The telescopic plate is connected to the grinding sheet, so that the grinding sheet moves from both sides of the bottom mold to the middle and merges together to form a hollow three-dimensional structure. The grinding sheet is located above the impeller cavity. When the push rod pushes the casting out of the impeller cavity, the blades of the impeller casting contact and rub against the side walls of the grinding sheet. The grinding sheet grinds the burrs and uneven parts on the side of the blades. When the push rod completely pushes the casting out of the impeller cavity, the push rod continues to push the impeller casting to the right until the impeller casting passes through the grinding sheet as a whole. At this time, the blades of the entire impeller casting are polished, and the impeller casting falls under the influence of gravity and falls into the channel inside the baffle. The baffle further grinds the surface of the impeller casting. After the impeller casting is demoulded and polished, it is separated from the impeller mold of the centrifugal pump, and then the motor is turned on to drive the cover plate to move left and wait for the next casting work.

[0006] Preferably, a chute is provided at the connection between the guide rod and the push rod, a wheel rod is provided inside the chute, and the bottoms of the wheel rods are connected by a second spring. When the guide rod is affected by the rotating adjusting wheel to generate a pulling force to the left on the push rod, the chute connected between the push rod and the guide rod is offset and the wheel rod inside the chute moves to both sides. When the guide rod is affected by the reverse rotating adjusting wheel to generate a thrust to the right on the push rod, the chute connected between the push rod and the guide rod is reversely offset and the wheel rod inside the chute moves inwardly. At this time, the second spring between the bottoms of the wheel rods is deformed and shortened by the thrust to the inside. Since the second spring itself is in a reset state during the shortening process, the speed of the chute reversely deflects faster, the speed of the push rod moving to the right is faster, and the speed of the push rod pushing the casting inside the impeller cavity is accelerated, so that the casting demolding efficiency is higher.

[0007] Preferably, the channel is composed of a plurality of extrusion plates, the distance between two opposite extrusion plates is not greater than the depth of the impeller cavity, and a third spring is provided on the outer side of the extrusion plate. A plurality of extrusion plates are provided on the inner side of the baffle plate, and a third spring is provided on the bottom of each extrusion plate. The extrusion plates grind the surface of the impeller casting passing through the channel. When there is a height difference on the surface of the impeller casting, the deformation degree of the third spring is inconsistent, so that various parts of the surface of the impeller casting are squeezed and polished by different extrusion plates, so that the surface of the impeller casting is polished and smooth, and at the same time, the wear and damage of the baffle plate on the height difference and curvature of the impeller casting surface is reduced.

[0008] Preferably, the bottom of the channel is provided with an arc surface, the end of the arc surface is a horizontal plane, and a bracket perpendicular to the horizontal plane is provided at the end of the arc surface. After the impeller casting passes through the channel, the arc surface at the bottom of the channel causes the impeller casting to change its sliding trajectory, and the final running trajectory is in the horizontal direction. A bracket is provided at the end of the arc surface. When the impeller casting slides to the end of the arc surface, the impeller casting detaches from the arc surface and falls due to gravity. At this time, the circular notch on the surface of the impeller casting is plugged into the bracket to facilitate the collection of the impeller casting. At the same time, the phenomenon of blade wear caused by collision between impeller castings that slide to the bottom surface is reduced.

[0009] Preferably, the grinding sheet is in the shape of a semi-hollow cylinder, and the opening of the grinding sheet faces the side close to the bottom mold. The grinding sheet has a semi-hollow cylindrical appearance, and when the grinding sheets on both sides are combined together, a hollow cylinder is formed. The hollow cylinder is placed on the right side of the impeller cavity, so that when the impeller casting moves to the right, the blade side of the impeller casting is subjected to the same friction force, making the side of the impeller casting smoother and reducing the wear of some parts of the casting due to excessive grinding.

[0010] Preferably, the polishing sheet is provided with a notch and a protrusion inserted into the notch at the fitting place, and the inner wall of the polishing sheet is provided with several layers of guide rails. Since the polishing sheet is connected to the telescopic plate, when the push rod pushes the impeller casting to the right, the blades of the impeller casting generate a rightward thrust on the polishing sheet while the polishing sheet remains in its original position, so that the polishing sheet generates friction on the blades of the impeller casting. The polishing sheets are connected by the notch and the protrusion, so that the two polishing sheets fit firmly and the side walls of the polishing sheets form a closed surface, so that the polishing effect of the impeller casting is better. The guide rails on the inner wall of the polishing sheet ensure that the impeller casting is always stuck on each layer of the guide rails during the process of passing through the polishing sheet, and it is not easy to slip, causing the entire casting to shift, thereby affecting the subsequent polishing of the surface.

[0011] Preferably, a rotating shaft is provided at the bottom of the upper mold, and the size of the rotating shaft is the same as the size of the circular protrusion inside the impeller cavity. When the upper mold and the bottom mold are separated, the rotating shaft at the bottom of the upper mold starts to rotate under the influence of the motor, and the impeller casting inside the impeller cavity moves right under the influence of the bottom push rod and is sleeved on the outside of the rotating shaft. The rotating shaft drives the impeller casting to rotate continuously during the rightward movement, so that the grinding effect of the blade side of the impeller casting is better. When the push rod pushes the impeller casting away from the grinding sheet, the rotating shaft stops rotating and detaches from the impeller casting, so that the impeller casting falls into the baffle under the influence of gravity and starts to grind the surface.

[0012] Preferably, a stripper plate is provided on the top of the push rod, and a fourth spring is provided between the stripper plate and the push rod. The fourth spring provided on the top of the push rod can provide a buffering effect when the push rod moves to the right and generates thrust on the impeller casting. At the same time, the surface area of ​​the stripper plate is much larger than that of the push rod, which can reduce the pressure of the push rod on the bottom of the impeller casting and reduce the possibility of the push rod damaging the impeller casting.

[0013] The beneficial effects of the utility model are:

[0014] 1. The impeller mold of a centrifugal pump described in the utility model realizes the automatic demoulding function of the impeller casting after the impeller mold of the centrifugal pump is completed and the cover plate is opened through the linkage cooperation of the movable connecting rod, the guide rod and the push rod.

[0015] 2. The impeller mold of a centrifugal pump described in the utility model drives the telescopic plate to move up and down by moving the push rod, so that the impeller casting can complete the automatic grinding function of the side of the impeller mold blade during the demolding process. At the same time, the baffles arranged on the side walls of the upper mold and the impeller bottom mold enable the impeller casting to complete the automatic grinding function of the upper and lower surfaces of the impeller mold after demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a front view of the utility model;

[0019] Figure 3 This is an internal cross-sectional view of the utility model after the mold is completed;

[0020] Figure 4 It is an internal cross-sectional view of the mold casting process of the utility model;

[0021] Figure 5 It is a combined stereogram of the push rod, the adjusting wheel, the guide rod and the slideway;

[0022] Figure 6 It is a combined stereogram of a push rod, a gear, a telescopic plate and a rack;

[0023] Figure 7 is a stereogram of the slider;

[0024] Figure 8 It is a front view of the combination of the movable link, the slide bar and the first spring;

[0025] Fig. 9 is the plan view of the extruded plate;

[0026] Fig.10 It is a three-dimensional picture of the notches and protrusions on the grinding sheet;

[0027] Fig.11 This is a three-dimensional image of the polishing sheets after merging;

[0028] Fig.12 It is a combined three-dimensional diagram of the upper mold and the cover plate;

[0029] Fig.13 It is a combined stereogram of the push rod, the stripper plate and the fourth spring.

[0030] In the figure: 1. base; 2. bottom mold; 3. push rod; 4. movable connecting rod; 5. sliding rod; 6. first spring; 7. adjusting wheel; 8. guide rod; 9. gear; 10. telescopic plate; 11. rack; 12. grinding disc; 13. impeller cavity; 14. upper mold; 15. cover plate; 16. groove; 17. baffle; 18. channel; 19. slide groove; 20. wheel rod; 21. second spring; 22. extrusion plate; 23. third spring; 24. arc surface; 25. bracket; 26. notch; 27. protrusion; 28. guide rail; 29. ​​rotating shaft; 30. stripping plate; 31. fourth spring; 32. straight rod; 33. rotating wheel; 34. spherical groove; 35. ball; 36. rotating arm. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1:

[0033] like Figures 1 to 9 As shown, an impeller mold of a centrifugal pump according to an embodiment of the utility model, wherein Figure 1The direction shown is the standard direction, which includes a base 1, a bottom mold 2 is provided on the base 1, a push rod 3 is provided inside the bottom mold 2, a movable connecting rod 4 is movably inserted at the top of the bottom mold 2, a sliding rod 5 is fixedly connected to the left end of the movable connecting rod 4, a first spring 6 is provided at the end of the sliding rod 5, and the sliding rod 5 includes a straight rod 32 and a rotating wheel 33, wherein the straight rod 32 is connected to the outside of a spherical groove 34, a round ball 35 is clamped in the spherical groove 34, a rotating arm 36 is provided on the top of the round ball 35, and the outer side of the rotating arm 36 is rotatably connected to the rotating wheel 33. When the sliding rod 5 is subjected to the force of the upper push rod 3, the straight rod 32 moves left and right, so that the round ball 35 in the spherical groove 34 rotates, the round ball 35 drives the rotating arm 36 to rotate, and the rotating arm 36 drives the rotating wheel 33 to rotate, and the end of the sliding rod 5 is rotatably connected to an adjusting wheel 7, and the adjusting wheel 7 is driven to rotate by the rotating wheel 33 at the bottom of the sliding rod 5, and a guide rod 8 is movably connected to the adjusting wheel 7, and the top of the guide rod 8 is movably connected to the push rod 3 Next, a gear 9 and a telescopic plate 10 are installed inside the bottom mold 2. The gear 9 is arranged on the outer side of the left and right side walls of the push rod 3, and the telescopic plate 10 is located below the gear 9. Racks 11 are arranged on the left and right side walls of the push rod 3 and the telescopic plate 10. The racks 11 are meshed with the gear 9, and the racks 11 and the telescopic plate 10 are staggered front and back. A grinding sheet 12 is arranged at the end of the telescopic plate 10, and the grinding sheet 12 is parallel to the bottom mold 2. An impeller cavity 13 is arranged on the bottom mold 2. The impeller cavity 13 includes a plurality of fan blade cavities and a circular through opening. The fan blade grooves 16 are distributed in a circular array on the outer side of the circular protrusion 27. The impeller cavity 13 is covered with an upper mold 14. The outer wall of the upper mold 14 is fitted with the inner wall of the impeller cavity 13. A cover plate 15 is arranged on the top of the upper mold 14. A groove 16 corresponding to the movable connecting rod 4 is opened at the bottom of the cover plate 15. Baffles 17 are arranged on the side walls of the upper mold 14 and the side walls of the bottom mold 2, and a channel 18 is formed between the baffles 17.

[0034] The push rod 3 can move left and right inside the bottom mold 2. When the push rod 3 moves to the right, the top of the push rod 3 can penetrate into the impeller cavity 13 and generate thrust to the inside of the impeller cavity 13. When the push rod 3 contacts the impeller casting formed inside the impeller cavity 13, the push rod 3 generates a rightward thrust to the impeller casting, pushing the impeller casting to the side close to the upper mold 14 and separating the impeller casting from the bottom mold 2. The impeller casting falls due to the influence of gravity and completes the automatic demolding function. A rack 11 is provided at the bottom of the push rod 3, and the rack 11 is meshed with the gear 9. When the push rod 3 moves left and right under the influence of the guide rod 8, the push rod 3 drives the gear 9 to rotate, and the gear 9 in a rotating state affects the movement state of the telescopic plate 10 meshed with the gear 9. A grinding sheet 12 is provided at the end of the telescopic plate 10, and the grinding sheets 12 are arranged on both sides above the impeller cavity 13. The telescopic plate 10 starts to move and drives the grinding sheets 12 to move. According to the moving direction of the grinding sheets 12, the grinding sheets 12 can be separated from each other or merged together. The cover plate 15 moves left and right, and the upper mold 14 under the cover plate 15 moves with the movement of the cover plate 15, while the bottom mold 2 remains in its original position, so that the upper mold 14 and the bottom mold 2 are in contact or separated, and the push rod 3 and the grinding sheet 12 are further driven to move, so that after the impeller mold is completed, the automatic demoulding function can be realized. At the same time, the side walls of the combined grinding sheets 12 are closed. When the impeller casting passes through the grinding sheet 12, the blade side of the impeller casting contacts and generates friction with the grinding sheet 12, so that the blade side of the impeller casting can be polished during the automatic demoulding process. After the polishing process is performed, the push rod 3 continues to push the impeller casting to the right and disengages from the polishing sheet 12 under the influence of the spring return inside the bottom mold 2. After there is no support of the polishing sheet 12 below the impeller casting, the impeller casting falls under the influence of gravity and falls into the baffle 17. Since the baffle 17 is arranged on both sides of the falling impeller casting, when the impeller casting passes through the channel 18, the upper and lower surfaces of the impeller casting are rubbed by the baffles 17 on both sides, completing the automatic polishing function of the surface of the impeller casting, thereby realizing the automatic demoulding and automatic polishing functions of the impeller mold of the centrifugal pump.

[0035] When using the impeller mold of the centrifugal pump, the cover plate 15 is pushed to move to the left and the upper mold 14 at the bottom of the cover plate 15 contacts the bottom mold 2 on the left. The impeller cavity 13 on the upper mold 14 and the bottom mold 2 are consistent in shape so that the upper mold 14 fits the bottom of the impeller cavity 13. At this time, the groove 16 opened on the cover plate 15 fits the movable connecting rod 4 at the top of the bottom mold 2. The movement of the cover plate 15 causes the groove 16 to generate a thrust on the movable connecting rod 4. The movable connecting rod 4 contracts inwardly and drives the slide bar 5 to move to the left. The first spring 6 provided at the bottom of the slide bar 5 is squeezed and deformed. At the same time, the slide bar 5 generates a force on the adjusting wheel 7, which makes the adjusting wheel 7 rotate in place and drives the guide rod 8 to generate a leftward pulling force on the push rod 3. The push rod 3 completely leaves the impeller cavity 13. The impeller cavity 13 and the upper mold 14 form a closed space, which is convenient for the impeller casting mold work. When the push rod 3 is pulled to the left by the guide rod 8, the rack 11 at the bottom of the push rod 3 moves to the left, and the gear 9 meshing with the rack 11 rotates and drives the telescopic plate 10 meshing with the side to move outward. The telescopic plate 10 is connected to the grinding sheet 12, so that the grinding sheet 12 moves to both sides of the bottom mold 2 to prevent the grinding sheet 12 from blocking between the bottom mold 2 and the upper mold 14 and affecting the mold work. The casting is injected into the impeller cavity 13 from the cover plate 15 to start the mold. After the mold is completed, the motor drives the cover plate 15 to open, the groove 16 moves right and disengages from the movable link 4, and the movable link 4 is no longer subjected to the pressure of the groove 16. The first spring 6 at the bottom of the slide bar 5 is reset and pushes the slide bar 5 to move right, and the slide bar 5 drives the adjusting wheel 7 to rotate in the opposite direction. The adjusting wheel 7 rotating in the opposite direction drives the guide rod 8 to generate a rightward thrust on the push rod 3. The push rod 3 enters the impeller cavity 13 from the bottom of the impeller cavity 13 and presses against the bottom of the casting inside the impeller cavity 13, so that the casting moves to the right and disengages from the bottom mold 2, and the casting completes the demoulding work. When the push rod 3 is pushed to the right by the guide rod 8, the rack 11 at the bottom of the push rod 3 moves to the right, and the gear 9 meshing with the rack 11 rotates and drives the telescopic plate 10 meshing with the side to move inward, and the telescopic plate 10 is connected to the grinding sheet 12, so that the grinding sheet 12 moves from both sides of the bottom mold 2 to the middle and merges together to form a hollow three-dimensional structure. The grinding sheet 12 is located above the impeller cavity 13. When the push rod 3 pushes the casting out of the impeller cavity 13, the blades of the impeller casting contact the side wall of the grinding sheet 12 and produce friction. The grinding sheet 12 grinds the burrs and uneven parts on the side of the blades. After the push rod 3 completely pushes the casting out of the impeller cavity 13, the push rod 3 continues to push the impeller casting to the right until the impeller casting passes through the grinding sheet 12 as a whole. At this time, the blades of the entire impeller casting are polished. The impeller casting falls under the influence of gravity and falls into the channel 18 inside the baffle 17. The baffle 17 further grinds the surface of the impeller casting. After the impeller casting is demolded and polished, it is separated from the impeller mold of the centrifugal pump, and then the motor is turned on to drive the cover plate 15 to move left, and wait for the next mold work.

[0036] A slide groove 19 is provided at the connection between the guide rod 8 and the push rod 3, a wheel rod 20 is provided inside the slide groove 19, and the bottoms of the wheel rod 20 are connected by a second spring 21. When the guide rod 8 is affected by the rotating adjustment wheel 7 to generate a leftward pulling force on the push rod 3, the slide groove 19 connected between the push rod 3 and the guide rod 8 is offset and the wheel rod 20 inside the slide groove 19 moves to both sides. At this time, the second spring 21 between the bottoms of the wheel rod 20 is deformed and elongated by the outward pulling force. When the guide rod 8 is affected by the reverse rotating adjusting wheel 7 to generate a rightward thrust on the push rod 3, the slide slot 19 connected between the push rod 3 and the guide rod 8 is reversely offset and causes the wheel rod 20 inside the slide slot 19 to move inward. At this time, the second spring 21 between the bottom of the wheel rod 20 is deformed and shortened by the inward thrust. Since the second spring 21 itself is in a reset state during the shortening process, the second spring 21 generates a pulling force on the wheel rod 20 and causes the slide slot 19 to reversely offset faster, causing the push rod 3 to move to the right faster, and the push rod 3 pushes the casting inside the impeller cavity 13 faster, making the casting demolding more efficient, thereby improving the operating efficiency of the entire device.

[0037] The channel 18 is composed of a plurality of extrusion plates 22, the distance between two relative extrusion plates 22 is not greater than the depth of the impeller cavity 13, and a third spring 23 is arranged on the outer side of the extrusion plate 22. Since the blades of the centrifugal pump impeller may have a height difference, the curvature formed by this height difference can improve the efficiency of the centrifugal pump. When the impeller casting with a curvature on the surface passes through the channel 18, it is rubbed by the baffles 17 on both sides, which may cause the original curvature of the surface to wear and affect the normal use of the impeller. A plurality of extrusion plates 22 are arranged on the inner side of the baffle 17, and a third spring 23 is arranged at the bottom of the extrusion plate 22. The extrusion plate 22 polishes the surface of the impeller casting passing through the channel 18. When there is a height difference on the surface of the impeller casting, the deformation degree of the third spring 23 is inconsistent, so that each part of the surface of the impeller casting is squeezed and polished by different extrusion plates 22, so that the surface of the impeller casting is polished and smooth, and at the same time, the wear and damage of the baffle 17 on the height difference and curvature of the impeller casting surface is reduced.

[0038] The bottom of the channel 18 is provided with an arc surface 24, the end of the arc surface 24 is a horizontal plane, and a bracket 25 perpendicular to the horizontal plane is provided at the end of the arc surface 24. After the impeller casting passes through the channel 18, the arc surface 24 at the bottom of the channel 18 changes the sliding running track of the impeller casting, and the final running track is in the horizontal direction. The end of the arc surface 24 is provided with a bracket 25. When the impeller casting slides to the end of the arc surface 24, the impeller casting is separated from the arc surface 24 and falls due to the influence of gravity. At this time, the circular through hole on the surface of the impeller casting is plugged into the bracket 25, which is convenient for collecting the impeller casting. At the same time, the phenomenon of blade wear caused by collision between the impeller castings that slide to the bottom is reduced.

[0039] The grinding sheet 12 is in the shape of a semicircular ring, and the opening of the grinding sheet 12 faces the side close to the bottom mold 2. The grinding sheet 12 has a semi-hollow cylinder appearance. When the grinding sheets 12 on both sides are combined together, a hollow cylinder is formed. The hollow cylinder is placed on the right side of the impeller cavity 13, so that when the impeller casting moves to the right, the blade side of the impeller casting is subjected to the same friction force, making the side of the impeller casting smoother and reducing the wear of some parts of the casting due to excessive grinding.

[0040] Embodiment 2:

[0041] like Figures 10 to 13 As shown, the grinding sheet 12 is provided with a notch 26 and a protrusion 27 inserted into the notch 26 at the fitting part, and a plurality of guide rails 28 are provided on the inner wall of the grinding sheet 12. Since the grinding sheet 12 is connected to the telescopic plate 10, when the push rod 3 pushes the impeller casting to the right, the blades of the impeller casting generate a rightward thrust on the grinding sheet 12 while the grinding sheet 12 remains in its original position, so that the grinding sheet 12 generates friction force on the blades of the impeller casting. The grinding sheets 12 are connected by the notch 26 and the protrusion 27, so that the two grinding sheets 12 fit firmly and the side walls of the grinding sheets 12 form a closed surface, so that the grinding effect of the impeller casting is better. The guide rails 28 on the inner wall of the grinding sheet 12 ensure that the impeller casting is always stuck on each layer of the guide rails 28 during the process of passing through the grinding sheet 12, and it is not easy to slip, causing the entire casting to deviate, thereby affecting the subsequent surface grinding work.

[0042] A rotating shaft 29 is provided at the bottom of the upper mold 14, and the size of the rotating shaft 29 is the same as the size of the circular protrusion 27 inside the impeller cavity 13. When the upper mold 14 and the bottom mold 2 are separated, the rotating shaft 29 at the bottom of the upper mold 14 starts to rotate under the influence of the motor, and the impeller casting inside the impeller cavity 13 moves rightward under the influence of the bottom push rod 3 and is sleeved on the outside of the rotating shaft 29. The rotating shaft 29 drives the impeller casting to continue to rotate during the rightward movement, so that the grinding effect of the blade side of the impeller casting is better. When the push rod 3 pushes the impeller casting away from the grinding sheet 12, the rotating shaft 29 stops rotating and detaches from the impeller casting, so that the impeller casting falls into the baffle 17 under the influence of gravity and starts to grind the surface.

[0043] A stripper plate 30 is provided on the top of the push rod 3, and a fourth spring 31 is provided between the stripper plate 30 and the push rod 3. The fourth spring 31 provided on the top of the push rod 3 enables the push rod 3 to produce a buffering effect when it moves to the right and generates thrust on the impeller casting. At the same time, the surface area of ​​the stripper plate 30 is much larger than that of the push rod 3, which can reduce the pressure of the push rod 3 on the bottom of the impeller casting and reduce the possibility of the push rod 3 damaging the impeller casting.

[0044] Working principle: push the cover plate 15 to move to the left and make the upper mold 14 at the bottom of the cover plate 15 contact with the bottom mold 2 on the left side. The impeller cavity 13 on the upper mold 14 and the bottom mold 2 are consistent in shape so that the upper mold 14 and the bottom of the impeller cavity 13 fit together. At this time, the groove 16 opened on the cover plate 15 fits with the movable connecting rod 4 at the top of the bottom mold 2. The movement of the cover plate 15 causes the groove 16 to generate a thrust on the movable connecting rod 4. The movable connecting rod 4 contracts inwardly and drives the slide rod 5 to move to the left. The first spring 6 at the bottom of the slide rod 5 is squeezed and deformed. At the same time, the slide rod 5 generates a force on the adjusting wheel 7, which makes the adjusting wheel 7 rotate and drives the guide rod 8 to generate a leftward pulling force on the push rod 3. The push rod 3 and the impeller cavity 13 are not in contact. When the push rod 3 is pulled to the left by the guide rod 8, the rack 11 at the bottom of the push rod 3 moves to the left, and the gear 9 meshing with the rack 11 rotates and drives the telescopic plate 10 meshing with the side to move outward. The telescopic plate 10 is connected to the grinding sheet 12, so that the grinding sheet 12 moves to both sides of the bottom mold 2 to prevent the grinding sheet 12 from blocking between the bottom mold 2 and the upper mold 14 and affecting the mold work. The casting is injected into the impeller cavity 13 from the cover plate 15, and the mold is started. After the mold is completed, the cover plate 15 moves to the right to make the groove 16 disengage from the movable connecting rod 4, the first spring 6 at the bottom of the slide rod 5 resets and pushes the slide rod 5 to the right, the slide rod 5 drives the adjusting wheel 7 to rotate in the opposite direction, and the adjusting wheel 7 drives the guide rod 8 to generate a rightward thrust on the push rod 3, and the push rod 3 enters the impeller cavity 13, and the casting completes the demolding work. When the push rod 3 is pushed to the right by the guide rod 8, the rack 11 at the bottom of the push rod 3 moves to the right, and the gear 9 meshing with the rack 11 rotates and drives the telescopic plate 10 meshing with the side to move inward, and the telescopic plate 10 is connected to the grinding sheet 12, so that the grinding sheet 12 is merged together. When the push rod 3 pushes the casting out of the impeller cavity 13, the blades of the impeller casting and the side wall of the grinding sheet 12 contact and generate friction, and the push rod 3 continues to push the impeller casting to the right until the impeller casting passes through the grinding sheet 12 as a whole. The impeller casting falls under the influence of gravity and falls into the channel 18 inside the baffle 17, and the baffle 17 further grinds the surface of the impeller casting.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An impeller mold for a centrifugal pump, comprising a base (1), characterized in that: The base (1) is provided with a bottom mold (2), a push rod (3) is provided inside the bottom mold (2), a movable connecting rod (4) is provided on the top of the bottom mold (2), a sliding rod (5) is slidably connected to the bottom of the movable connecting rod (4), a first spring (6) is provided at the end of the sliding rod (5), an adjusting wheel (7) is rotatably connected to the sliding rod (5), a guide rod (8) is movably connected to the adjusting wheel (7), the top of the guide rod (8) is movably connected to the push rod (3), a gear (9) and a telescopic plate (10) are installed inside the bottom mold (2), the gear (9) is arranged on the outer side of the left and right side walls of the push rod (3), the telescopic plate (10) is located below the gear (9), the left and right side walls of the push rod (3) and the telescopic plate (10) are both provided with racks (11), the rack (11) and the gear (9) are meshingly connected. The rack (11) and the telescopic plate (10) are staggered front and back, a grinding sheet (12) is provided at the end of the telescopic plate (10), the grinding sheet (12) is parallel to the bottom mold (2), the bottom mold (2) is covered with an impeller cavity (13), the impeller cavity (13) includes a plurality of fan blade grooves and a circular protrusion, the fan blade grooves are distributed in a circular array on the outside of the circular protrusion, the impeller cavity (13) is covered with an upper mold (14), the outer wall of the upper mold (14) is fitted with the inner wall of the impeller cavity (13), a cover plate (15) is provided on the top of the upper mold (14), and a groove (16) corresponding to the movable connecting rod is opened at the bottom of the cover plate (15), and baffles (17) are provided on the side walls of the upper mold (14) and the side walls of the bottom mold (2), and a channel (18) is formed between the baffles (17).

2. The impeller mold of a centrifugal pump according to claim 1, characterized in that: A slide groove (19) is provided at the connection between the guide rod (8) and the push rod (3), a wheel rod (20) is provided inside the slide groove (19), and the bottoms of the wheel rod (20) are connected via a second spring (21).

3. The impeller mold of a centrifugal pump according to claim 1, characterized in that: The channel (18) is composed of a plurality of extrusion plates (22), the distance between two opposite extrusion plates (22) is no greater than the depth of the impeller cavity (13), and a third spring (23) is provided on the outer side of the extrusion plate (22).

4. The impeller mold of a centrifugal pump according to claim 1, characterized in that: The bottom of the channel (18) is provided with a curved surface (24), the end of the curved surface (24) is a horizontal plane, and the end of the curved surface (24) is provided with a bracket (25) perpendicular to the horizontal plane.

5. The impeller mold of a centrifugal pump according to claim 1, characterized in that: The grinding sheet (12) is in the shape of a semi-hollow cylinder, and the opening of the grinding sheet (12) faces the side close to the bottom mold (2).

6. The impeller mold of a centrifugal pump according to claim 1, characterized in that: A notch (26) and a protrusion (27) inserted into the notch (26) are provided at the abutting position of the grinding sheet (12), and a plurality of layers of guide rails (28) are provided on the inner wall of the grinding sheet (12).

7. The impeller mold of a centrifugal pump according to claim 1, characterized in that: A rotating shaft (29) is provided at the bottom of the upper mold (14), and the size of the rotating shaft (29) is the same as the size of the circular protrusion inside the impeller cavity (13).

8. The impeller mold of a centrifugal pump according to claim 1, characterized in that: A stripping plate (30) is provided on the top of the push rod (3), and a fourth spring (31) is provided between the stripping plate (30) and the push rod (3).

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