Casting device for pump valve casting production

Abstract

The invention relates to the technical field of casting equipment, in particular to a casting device for pump valve casting production, which comprises a conveying rack, a mold frame mounted on the conveying rack, and a sand injection station, the sand injection station comprises a mounting frame, a sand discharging mechanism mounted on the mounting frame and a tamping mechanism for tamping molding sand. According to the casting device for pump valve casting production, by arranging the discharging mechanism, when a motor drives a discharging roller to discharge materials in a feeding hopper, a screening disc can be synchronously driven to move up and down, and discharged molding sand is screened; meanwhile, when the molding sand falls on the screen, the middle of the screen is raised, so that the molding sand is more uniformly distributed in the mold frame; and meanwhile, the materials in the mold frame are preliminarily hammered and tamped.

Description

Technical Field

[0001] The present invention relates to the technical field of casting equipment, and particularly relates to a casting device for the production of pump valve castings. Background Art

[0002] In the pump valve industry, castings are core components. Among them, the commonly used process is sand-coated iron mold casting; this technology is a casting process that combines a metal mold (iron mold) with molding sand; Modern casting devices are developing towards mechanization, automation, and intelligence; the sand-coated mold production line is equipped with equipment such as a top-hole cleaning machine, a temperature control device, and a sand-coated molding machine, realizing full-process automation from molding to mold opening, with a production efficiency of 30 molds / h and a significant reduction in labor intensity; at the same time, combined with sensor and data analysis technologies, the production process can be monitored in real time, and process parameters can be optimized to further improve product quality.

[0003] Patent Application No. CN202410407016.8 discloses a casting device for the production of pump valve castings, including a bearing structure, a lower sand structure, and a hammer pressing structure; the lower sand structure is movably arranged above the bearing structure, and the hammer pressing structure is movably arranged in front of the bearing structure. In the present invention, the lower sand structure independently promotes material feeding, and the hammer pressing structure compacts and levels, greatly reducing manual operations and improving production efficiency; since the green sand can fully enter the mold frame and be fully compacted, the accuracy of model forming and the surface quality can be ensured; the reduction of manual operations required reduces labor costs and can also avoid errors caused by human fatigue or carelessness; the automated operation can quickly complete steps such as the loading, compaction, and leveling of green sand, shortening the production cycle and improving production efficiency.

[0004] However, this patent has a defect of insufficient adjustment accuracy of the feeding amount by independently promoting material feeding; excessive feeding at one time easily leads to uneven distribution of sand materials in the mold cavity, forming gaps, and at the same time causing sand overflow; these problems will have a potential impact on the stability of the subsequent compaction process.

[0005] Therefore, it is necessary to provide a new technical solution to overcome the above defects. Summary of the Invention

[0006] The purpose of the present invention is to provide a casting device for the production of pump valve castings that can effectively solve the above technical problems.

[0007] To achieve the purpose of the present invention, the following technical solutions are adopted: A casting device for the production of pump valve castings, including: a conveying frame, a mold frame installed on the conveying frame, and a sand injection station; The sand injection station includes: a mounting frame, a lower sand mechanism installed on the mounting frame, and a ramming mechanism for ramming the molding sand; The lower sand feeding mechanism includes: a feeding hopper fixedly installed on the installation frame, a rotating rod rotatably installed at the bottom of the feeding hopper, a blanking roller slidably installed on the rotating rod, a first motor for driving the rotating rod to rotate, and an adjusting assembly for adjusting the blanking amount; the output shaft of the first motor is fixedly connected to the blanking roller.

[0008] Further, the adjusting assembly includes: a cylinder for driving the blanking roller to move; a blanking groove is formed on the blanking roller; the notch of the blanking groove gradually narrows from one side to the other side; the telescopic rod of the cylinder is fixedly connected to the blanking roller through a bearing.

[0009] Further, the blanking groove can be divided into a fast blanking section, a medium blanking section, and a slow blanking section according to the notch width.

[0010] Further, the lower sand feeding mechanism further includes: a screening assembly for screening the molding sand during blanking: The screening assembly includes: a turntable coaxially and fixedly connected to the conveying shaft of the first motor; a driving rod rotatably installed on the turntable, a slider rotatably connected to the other end of the driving rod, and the slider is elastically installed on the screening plate; the driving rod is rotatably installed at a non-central end of the turntable; a limiting rod is provided on the installation frame; the screening plate is slidably installed on the limiting rod.

[0011] Further, the screening plate is composed of a screen frame and a screen mesh; the screen mesh is a screen mesh with a middle bulge and gradually decreasing towards both sides.

[0012] Further, the ramming mechanism includes: a second motor fixedly installed on the conveying frame, a rotating rod fixedly connected to the output shaft of the second motor, a driving gear slidably installed on the rotating rod, a driven gear meshing with the driving gear, a hammer fixedly connected to the driven gear, a second return spring for driving the driven gear to reset, and a connecting rod rotatably connected to the axis of the driven gear; the connecting rod is fixedly installed on the conveying frame.

[0013] Further, the driving gear is composed of multiple gears with different tooth numbers; the driving gear is connected to the telescopic rod of the cylinder through a synchronizing rod; one end of the synchronizing rod is rotatably connected to the driving gear.

[0014] Further, the driving gear is divided into a fast ramming section, a medium ramming section, and a slow ramming section.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In a casting device for producing pump valve castings according to the present invention, by providing a blanking mechanism, when the motor drives the blanking roller to feed the material in the feeding hopper, it can also drive the screening plate to move up and down synchronously to screen the fed molding sand; at the same time, when the molding sand falls on the screen, the middle of the screen bulges, realizing a more uniform distribution of the molding sand in the mold frame; at the same time, the material in the mold frame is initially hammered and tamped. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

[0017] Figure 1 is a schematic structural diagram of a casting device for producing pump valve castings according to the present invention; Figure 2 is a sectional view of a casting device for producing pump valve castings according to the present invention; Figure 3 is a schematic structural diagram of the sand injection station in the present invention; Figure 4 is a schematic structural diagram of the lower sand mechanism in the present invention; Figure 5 is Figure 4 a partial enlarged view of part A in Figure 6 is a schematic structural diagram of the adjusting assembly in the present invention; Figure 7 is a schematic structural diagram of the feeding hopper in the present invention; Figure 8 is a schematic structural diagram of the screening plate in the present invention; Figure 9 is a schematic structural diagram of the driving gear in the present invention; Figure 10 is a schematic structural diagram of the ramming mechanism in the present invention; Figure 11 is Figure 10 a schematic structural diagram of part B in

[0018] In the figure: 1. Conveyor frame; 2. Mould frame; 3. Sand injection station; 31. Mounting frame; 32. Lower sand mechanism; 33. Tamping mechanism; 321. Feeding hopper; 322. Rotating rod; 323. Lowering roller; 324. First motor; 325. Adjusting assembly; 3251. Cylinder; 3252. Lowering chute; 3253. Bearing; 34. Sieving assembly; 341. Turntable; 342. Driving rod; 343. Slide block; 344. First spring; 345. Limiting rod; 346. Sieving plate; 3461. Sieving frame; 3462. Sieve mesh; 331. Second motor; 332. Rotating rod; 333. Driving gear; 334. Driven gear; 335. Hammer; 336. Second reset spring; 337. Connecting rod; 338. Synchronizing rod; 3331. Fast knocking section; 3332. Medium knocking section; 3333. Slow knocking section. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some but not all of the embodiments of the present invention.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "transverse", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0021] As Figures 1 to 11 shown, a casting device for producing pump valve castings according to the present invention includes a conveyor frame 1, a mould frame 2 mounted on the conveyor frame 1, and a sand injection station 3; It should be expanded here that a melting station, a sand injection station 3, and a pouring station are sequentially provided along the transmission direction of the conveyor frame 1; The melting station: responsible for melting metal raw materials into liquid metal to provide necessary materials for the subsequent casting process; The sand injection station 3: uses sand mold materials to make a sand mold that matches the shape of the pump valve casting, providing a space for the injection of liquid metal; The casting station: injects liquid metal into the prepared sand mold to complete the preliminary forming of the casting; The sand injection station 3 includes: a mounting frame 31, a lower sand mechanism 32 mounted on the mounting frame 31, and a ramming mechanism 33 for ramming the molding sand; The specific structures in the above melting station and casting station are prior art and will not be elaborated here.

[0022] During the intelligent forging process of the pump valve casting, the operator triggers the intelligent transmission system of the conveying rack 1 through the human-machine interface, enabling the mold frame 2 to achieve multi-station collaborative transfer along a preset trajectory; the mold frame 2 first moves to the sand injection station 3, and the automatic sand feeding device performs the quantitative filling operation of the molding sand, forming a sand mold cavity adapted to the structure of the pump valve casting through the sand compacting process; then the mold frame 2 is transferred to the casting station, and the intelligent casting system automatically performs the high-pressure casting process according to the process parameters. This process relies on a central control system based on PLC to achieve closed-loop regulation of process parameters, integrates the action timings of each execution unit through the OPC communication protocol, realizes the full-process intelligent integration of the casting unit, significantly reduces the intensity of human intervention, and improves the control accuracy of the production rhythm.

[0023] The lower sand mechanism 32 includes: a feeding hopper 321 fixedly installed on the mounting frame 31, a rotating rod 322 rotatably installed at the bottom of the feeding hopper 321, a feeding roller 323 slidably installed on the rotating rod 322, a first motor 324 for driving the rotating rod 322 to rotate, and an adjusting component 325 for adjusting the sand feeding amount; the output shaft of the first motor 324 is fixedly connected to the feeding roller 323; When the conveying rack 1 conveys the mold frame 2 below the feeding hopper 321, the first motor 324 drives the rotating rod 322 to rotate, and the feeding roller 323 slidably installed on the rotating rod 322 rotates accordingly. It should be added here that the rotating rod 322 is limited by a keyway with the feeding roller 323 - specifically, the rectangular key on the inner wall of the feeding roller 323 and the keyway in the outer cavity of the rotating rod 322 form a precision spline pair structure; thus, when the first motor 324 drives the rotating rod 322 to rotate, the feeding roller 323 drives the feeding roller 323 to rotate under the limitation of the limiting protrusion and the limiting groove; as the feeding roller 323 rotates, the molding sand in the feeding hopper 321 is put into the mold frame 2; this rotary feeding mode effectively avoids the density gradient distribution of the molding sand accumulation, eliminates the air gap defect in the pre-compaction stage in the mold cavity, and creates the best sand mold density basic condition for the subsequent high-frequency impact compaction process.

[0024] As a further extension of this application, in order to improve the stability of material feeding, the device is provided with two material feeding rollers 323. The two material feeding rollers 323 are meshed with each other through gears. When the first motor 324 drives the gear 333 to rotate, the two material feeding rollers 323 rotate towards each other under the meshing of the gears. The molding sand is forced to be extruded and sheared through the gap between the two rollers, forming a stable material feeding flow, thereby avoiding the unstable material feeding amount caused by the rotational speed fluctuation of a single roller; the contact surface of the double rollers is larger, reducing the phenomenon of molding sand caking or jamming.

[0025] The adjusting assembly 325 includes: a cylinder 3251 that drives the material feeding roller 323 to move; a material feeding groove 3252 is formed on the material feeding roller 323; the notch of the material feeding groove 3252 gradually narrows from one side to the other side; the telescopic rod of the cylinder 3251 is fixedly connected to the material feeding roller 323 through a bearing 3253.

[0026] When the material feeding roller 323 rotates and performs the material feeding operation on the molding sand in the feeding hopper 321, the cylinder 3251 drives the material feeding roller 323 to axially move to a specified position along the rotating rod 322 according to a preset material feeding duration (the material feeding duration is set manually according to experience according to the specifications of the mold frame 2); in view of the material feeding groove 3252 formed on the surface of the material feeding roller 323, the width of its notch gradually narrows from one end to the other end (as Figure 6 、 7 shown), the material feeding groove 3252 can be divided into a fast material feeding section, a medium material feeding section, and a slow material feeding section according to the notch width. Therefore, when the cylinder 3251 pushes the material feeding roller 323 to generate an axial displacement, the effective notch width of the material feeding groove 3252 decreases accordingly, thereby resulting in a reduction in the material feeding amount; specifically: At the start stage of the material feeding operation, in order to quickly fill the bottom of the mold frame 2 and shorten the filling cycle, it is necessary to ensure that the fast material feeding section with a larger notch width on the material feeding roller 323 is aligned with the material feeding port of the feeding hopper 321. By driving the material feeding roller 323 to rotate through the first motor 324, efficient and large-scale material feeding of the molding sand can be achieved.

[0027] When the molding sand is filled to half of the height of the mold frame 2, the cylinder 3251 drives the material feeding roller 323 to move axially in the direction of increasing notch width, so that the medium material feeding section is aligned with the lower part of the feeding hopper 321. At this time, the material feeding amount is regulated through the medium material feeding section, realizing the uniform accumulation and gradual compaction of the molding sand in the mold frame 2, effectively avoiding the molding sand from being embedded in the surface of the cavity due to excessive material feeding impact force.

[0028] Finally, in the stage when the molding sand is nearly full of the mold frame 2, the cylinder 3251 synchronously drives the material feeding roller 323, so that the slow material feeding section with the smallest notch width moves to the corresponding position of the feeding hopper 321. This can significantly reduce the looseness of the molding sand at the top of the mold frame 2, improve the density and uniformity of the molding sand filling, and thus reduce the surface defect rate of the casting and ensure the overall quality of the casting.

[0029] The lower sand mechanism 32 further includes a screening component 34 for screening the fed molding sand: The screening component 34 includes a turntable 341 coaxially and fixedly connected to the conveying shaft of the first motor 324; a driving rod 342 rotatably mounted on the turntable 341, a slider 343 rotatably connected to the other end of the driving rod 342, and the slider 343 is elastically mounted on the screening plate 346; the driving rod 342 is rotatably mounted at a non-central end of the turntable 341; a limiting rod 345 is provided on the mounting frame 31; the screening plate 346 is slidably mounted on the limiting rod 345; When the motor drives the blanking roller 323 to rotate for blanking, the motor synchronously drives the turntable 341 to rotate. The rotation of the turntable 341 drives the screen 3462 to move up and down along the limiting rod 345, so that the fed molding sand will first fall into the screening plate 346 and move up and down with the screening plate 346, screening the molding sand falling into the screening plate 346, thereby preventing larger particles from being doped in the molding sand, which may cause defects such as sand holes and slag inclusions on the surface of the casting during casting, seriously affecting the quality and performance of the casting. In addition, the presence of large particles may also affect the air permeability and fluidity of the molding sand, making the casting process more difficult and even possibly resulting in the scrapping of the casting.

[0030] During the process of blanking through the hopper 321, it is possible that the accumulation rate of materials directly below the blanking port is too fast, resulting in more materials accumulated in the central area of the mold frame 2 and relatively less materials distributed around the mold frame 2, thus forming a relatively significant height difference. In this case, manual or mechanical methods still need to be used for leveling treatment to prevent the problem of insufficient filling caused by uneven material filling.

[0031] The screening plate 346 is composed of a screen frame 3461 and a screen 3462; the screen 3462 is a screen 3462 with a raised middle and gradually decreasing towards both sides; Specifically, when the molding sand falls on the screen 3462, due to the raised middle of the screen 3462, the molding sand will roll towards both sides of the screen 3462 under the combined action of gravity and the shape of the screen 3462; this process not only helps to achieve a more uniform distribution of materials in the mold frame 2, but also can perform preliminary screening and grading of the materials; through this movement and action mechanism of the screen 3462, the uneven material accumulation condition can be effectively improved during the blanking process, reducing the workload of subsequent leveling treatment and improving production efficiency and product quality.

[0032] It should be added here that the screening plate 346 can be assembled with screening plates 346 of different sizes by people according to the size of the mold frame 2; thus, when feeding materials, the materials can be better dispersed on both sides of the mold frame 2. Moreover, when the mold frame 2 is almost filled with molding sand, the bottom of the screening mesh 3462 will continuously hammer down and flatten. It should be noted here that the slider 343 is elastically installed on the screening plate. Thus, when the height of the molding sand in the mold frame 2 gradually increases, through the elastic force relief of the first spring 344, damage to the structure can be prevented; on the one hand, the materials in the mold frame 2 are initially hammered and tamped; on the other hand, to prevent the molding sand from overflowing the mold frame 2 due to excessive feeding, manual secondary collection is still required, which reduces production efficiency.

[0033] It should be summarized here that when the motor drives the feeding roller 323 to feed the materials in the feeding hopper 321, it can also drive the screening plate 346 to move up and down synchronously to screen the fed molding sand; at the same time, when the molding sand falls on the screening mesh 3462, since the middle of the screening mesh 3462 bulges, a more uniform distribution of the molding sand in the mold frame 2 is achieved; at the same time, the materials in the mold frame 2 are initially hammered and tamped.

[0034] The ramming mechanism 33 includes: a second motor 331 fixedly installed on the conveying frame 1, a rotating rod 332 fixedly connected to the output shaft of the second motor 331, a driving gear 333 slidably installed on the rotating rod 332, a driven gear 334 meshing with the driving gear 333, a knocking hammer 335 fixedly connected to the driven gear 334, a second return spring 336 for driving the driven gear 334 to reset, and a connecting rod 337 rotatably connected to the axis of the driven gear 334; the connecting rod 337 is fixedly installed on the conveying frame.

[0035] After the molding sand in the feeding hopper 321 is fed into the mold frame 2, the second motor 331 is started at this time. This second motor 331 serves as a power source to drive the rotating rod 332 to perform a rotational motion. The rotating rod 332 is connected to the driving gear 333, and its rotation then drives the driving gear 333 to rotate synchronously. This driving gear 333 is designed as a semi-tooth gear, that is, its teeth do not cover the entire circumference but only occupy a partial circumferential area.

[0036] During the rotation of the driving gear 333, it will synchronously drive the driven gear 334 meshing with it to rotate. The driven gear 334 is connected to the knocking hammer 335. Therefore, when the driven gear 334 rotates, it will drive the knocking hammer 335 to perform a circular motion and knock on the side wall of the mold frame 2 during this process. This way of knocking while feeding can perform a preliminary ramming action on the molding sand in the mold frame 2, making the arrangement of the molding sand particles closer, thereby effectively improving the density of the materials.

[0037] Since the driving gear 333 is a semi-tooth gear, when the second motor 331 drives the driving gear 333 to rotate to the toothless section, the meshing relationship between the driving gear 333 and the driven gear 334 will be temporarily interrupted. At this time, the driven gear 334 will perform a reset movement under the action of the second spring, that is, return to its initial position or a specific position. When the driving gear 333 continues to rotate to the toothed section, it will mesh with the driven gear 334 again and drive the driven gear 334 and the knocking hammer 335 to perform the next round of knocking movement.

[0038] Through this design, the knocking hammer 335 can continuously knock on the side wall of the mold frame 2, so as to ensure that the molding sand in the mold frame 2 can be continuously tamped during the entire blanking process. This mechanical structure not only improves the density of the material, but also enhances the stability and reliability of the entire blanking process, which helps to improve the quality of the subsequent formed products.

[0039] The driving gear 333 is composed of multiple groups of gears with different tooth amounts; the driving gear 333 is connected to the telescopic rod of the air cylinder 3251 through a synchronous rod 338, and one end of the synchronous rod 338 is rotatably connected to the driving gear 333.

[0040] In the casting production or related material handling process, when the air cylinder 3251 executes the extending action to push the blanking roller 323 to move, it will synchronously drive the driving gear 333 to displace on the connecting rod 337. Along with the extending direction of the air cylinder 3251, the number of tooth sections on its gear gradually decreases, while the number of teeth corresponding to each section gradually increases (the specific structure can be referred to Figure 9 as shown), based on this characteristic, the driving gear 333 can be divided into a fast knocking section 3331, a medium knocking section 3332, and a slow knocking section 3333.

[0041] When the air cylinder 3251 pushes the blanking roller 323 to move to the fast blanking section, the blanking speed is at a relatively high level. At this time, the fast knocking section 3331 of the driving gear 333 meshes with the driven gear 334. The fast knocking section 3331 has a large number of tooth sections and a small number of teeth in a single tooth section, which can generate a relatively high knocking frequency but a relatively low amplitude. This high-frequency and low-amplitude knocking method can apply continuous impact force to the material just entering the mold frame 2 to achieve vibration and dispersion, trigger the propagation of stress waves in the material and produce a superposition effect, and promote the rearrangement of material particles before the molding sand naturally accumulates due to factors such as gravity, effectively avoiding the edge void problem caused by high-speed blanking, and improving the filling uniformity and density of the material in the mold frame 2.

[0042] When the air cylinder 3251 pushes the blanking roller 323 to move to the transition stage between the fast blanking section and the slow blanking section, the middle knocking section 3332 of the driving gear 333 meshes with the driven gear 334. The number of tooth segments and the number of teeth of the middle knocking section 3332 are between those of the fast knocking section 3331 and the slow knocking section 3333, and its knocking frequency and amplitude are also at a medium level. At this stage, the filling of the material in the mold frame 2 is in a transition state from preliminary filling to pre-filling completion. The middle knocking section 3332 can not only disperse the material to a certain extent through a moderate frequency to promote the reasonable distribution of particles, but also apply a certain pressure to the material through a moderate amplitude to make it gradually compact, laying a foundation for the subsequent slow blanking section and the final forming of the sand layer.

[0043] When the air cylinder 3251 pushes the blanking roller 323 to move to the slow blanking section, it simultaneously pushes the driving gear 333 to move to the slow knocking section 3333 to mesh with the driven gear 334. At this time, the pre-filling of the molding sand is completed. The slow knocking section 3333 has a small number of tooth segments and a large number of teeth in a single tooth segment, with a low knocking frequency but a high amplitude. The large-amplitude impact can generate a stronger impact force to penetrate the deposited sand layer, effectively eliminating the bottom air gap, improving the compactness and stability of the sand mold, providing a good foundation for the subsequent casting process, and ensuring the quality and performance of the casting.

[0044] Through the coordinated work of the air cylinder 3251 to push the blanking roller 323 and the driving gear 333, and the reasonable meshing of different knocking sections of the driving gear 333 with the driven gear 334, the precise control of the material blanking process can be achieved, improving the filling quality of the material in the mold frame 2 and the overall performance of the sand mold, thereby enhancing the quality and production efficiency of the casting product.

[0045] What needs to be summarized here is that by pushing the blanking roller 323 and the driving gear 333 with the air cylinder 3251, on the one hand, according to different blanking time periods, the blanking amount is adjusted differently to reduce the generation of voids of the molding sand in the mold frame 2. On the other hand, according to the change of the blanking amount, the amplitude changes synchronously to optimize the ramming effect of the molding sand in the mold frame 2.

[0046] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0047] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A casting device for producing pump and valve castings, characterized in that: include: Conveyor rack, mold frame installed on the conveyor rack, and sand injection station; The sand injection station comprises: a mounting frame, a sand discharging mechanism mounted on the mounting frame, and a compacting mechanism for compacting the molding sand; The sand unloading mechanism includes: an upper hopper fixedly mounted on the mounting frame, a rotating rod rotatably mounted on the bottom of the upper hopper, a unloading roller slidably mounted on the rotating rod, a first motor driving the rotating rod to rotate, and an adjusting component for adjusting the unloading amount; the output shaft of the first motor is fixedly connected to the unloading roller.

2. A casting device for producing pump and valve castings as claimed in claim 1, characterized in that: The adjustment assembly includes: a cylinder driving the unloading roller to move; a unloading trough is provided on the unloading roller; the notch of the unloading trough gradually decreases from one side to the other side; and the telescopic rod of the cylinder is fixedly connected to the unloading roller through a bearing.

3. A casting device for producing pump and valve castings as claimed in claim 2, characterized in that: The feeding chute can be divided into fast feeding section, medium feeding section and slow feeding section according to the width of the chute.

4. A casting device for producing pump and valve castings as claimed in claim 1, characterized in that: The sand discharging mechanism further comprises: a screening component for screening the discharged molding sand: The sub-screening assembly includes: a turntable coaxially fixedly connected to the first motor conveying shaft; a driving rod rotatably mounted on the turntable, a slider rotatably connected to the other end of the driving rod, and the slider is elastically mounted on the sub-screening plate; the driving rod is rotatably mounted on the non-center end of the turntable; a limit rod is provided on the mounting frame; and the sub-screening plate is slidably mounted on the limit rod.

5. A casting device for producing pump and valve castings as claimed in claim 4, characterized in that: The sub-screening plate is composed of a screen frame and a screen mesh; the screen mesh is a screen mesh that is raised in the middle and gradually lowers toward both sides.

6. A casting device for producing pump and valve castings as claimed in claim 2, characterized in that: The compacting mechanism includes: a second motor fixedly mounted on the conveying frame, a rotating rod fixedly connected to the output shaft of the second motor, a driving gear slidably mounted on the rotating rod, a driven gear meshing with the driving gear, a knocking hammer fixedly connected to the driven gear, a reset spring 2 for driving the driven gear to reset, and a connecting rod rotatably connected to the axis of the driven gear; the connecting rod is fixedly mounted on the conveying frame.

7. A casting device for producing pump and valve castings as claimed in claim 6, characterized in that: The driving gear is composed of a plurality of gears with different tooth amounts; the driving gear is connected to the telescopic rod of the cylinder through a synchronization rod; one end of the synchronization rod is rotationally connected to the driving gear.

8. A casting device for producing pump and valve castings as claimed in claim 7, characterized in that: The driving gear is divided into a fast striking section, a medium striking section and a slow striking section.

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