A device for coating and shelling pump body castings with sand.

Abstract

This utility model relates to the field of casting shell-making technology and discloses a device for making a coated sand shell for pump body castings. The device includes a machine body, a lower mold fixedly connected to the surface of the machine body, two sets of guide pillars symmetrically fixedly connected to the machine body, a fixing plate fixedly connected to the top surface of the two sets of guide pillars, a cylinder fixedly connected to the top surface of the fixing plate, a sliding plate fixedly connected to the output end of the cylinder, an upper mold fixedly connected to the bottom surface of the sliding plate, and an inner cavity sand core mold provided in both the upper and lower molds. A support frame is fixedly connected to the side wall of the machine body, a sand hopper is fixedly connected to the top surface of the support frame, a sand outlet pipe is connected to the bottom surface of the sand hopper, an arc-shaped contact plate is fixedly connected to the side wall of the support frame, a sand-shooting assembly is installed on the support frame, and a demolding assembly is installed inside the machine body. This utility model can achieve quantitative feeding of coated sand, accurately control the amount of coated sand in the sand-shooting cylinder, and meet the process requirements for making shells for pump body castings.

Description

Technical Field

[0001] This utility model relates to the field of casting shell making technology, specifically a device for coating sand to form a shell for pump body castings. Background Technology

[0002] Sand coating is a core process in pump body casting production. Pump body castings are mostly complex cavity structures with uneven wall thickness and tortuous flow channels. They have extremely high requirements for the dimensional accuracy, structural density and molding integrity of the shell. Therefore, the effect of the sand coating process directly determines the final molding quality and performance of the pump body casting.

[0003] Currently, existing shell-making equipment lacks a quantitative control structure in the coated sand feeding stage, making it impossible to control the feeding amount according to process requirements. Furthermore, the sealing effect between the feeding and sand injection channels is poor, leading to leakage of coated sand during sand injection, resulting in loss of sand injection pressure. This, in turn, causes uneven filling of the mold cavity, and problems such as voids and material shortages inside the shell. Moreover, the demolding operation after shell making relies heavily on manual labor, which can easily cause shell breakage due to uneven force application, resulting in a low shell yield. In addition, the low efficiency of manual operation makes it unsuitable for automated shell-making processes, thus restricting the overall production efficiency of coated sand shell making for pump body castings.

[0004] Therefore, we propose a device for coating sand to form a shell for pump body castings in order to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this utility model is to provide a device for making a coated sand shell for pump body castings, so as to solve the problems mentioned in the background art, that the existing device lacks a quantitative control structure for coated sand, cannot accurately control the amount of material to be fed according to the shell making process requirements, and the demolding operation mostly relies on manual operation, which easily affects the shell quality and leads to low overall shell making efficiency.

[0006] This utility model provides the following technical solution: a pump body casting coated sand shell making device, including a machine body, a lower mold fixedly connected to the surface of the machine body, four guide pillars fixedly connected to the four corners of the upper part of the machine body, a fixing plate fixedly connected to the top surface of the two sets of guide pillars, a cylinder fixedly connected to the top surface of the fixing plate, a sliding plate fixedly connected to the output end of the cylinder, an upper mold fixedly connected to the bottom surface of the sliding plate, multiple sand inlets are provided on both the upper mold and the lower mold, an inner cavity sand core mold is provided in both the upper mold and the lower mold, and an exhaust hole is provided on both the upper mold and the lower mold;

[0007] A support frame is fixedly connected to the side wall of the machine body, a sand hopper is fixedly connected to the top surface of the support frame, a sand outlet pipe is connected to the bottom surface of the sand hopper, an arc-shaped contact plate is fixedly connected to the side wall of the support frame, a sand shooting assembly is installed on the support frame, and a demolding assembly is installed inside the machine body.

[0008] Preferably, the slide plate has multiple guide sleeves embedded in it, and the multiple guide sleeves are slidably connected to the multiple guide posts.

[0009] Preferably, the sand-shooting assembly includes a mounting base fixedly connected to the side wall of the machine body, a motor is fixedly connected to the side wall of the mounting base, a lead screw is fixedly connected to the output end of the motor, a slider is threaded onto the lead screw, and two guide rods are symmetrically fixedly connected inside the mounting base, with the slider slidably connected to the two guide rods.

[0010] Preferably, a sand-shooting cylinder is fixedly connected to the top surface of the slider, and two sand-shooting pipes are connected to the side wall of the sand-shooting cylinder. A sand-shooting valve is provided in each of the two sand-shooting pipes, and a sealing cover is fixedly connected to the end face of the two sand-shooting pipes. The sand-shooting pipes are connected to the sand inlet.

[0011] Preferably, the top surface of the sand-shooting cylinder has a sand inlet hole, the side wall of the sand-shooting cylinder is fixedly connected to a support block, the support block is rotatably connected to a rotating shaft, the outer ring of the rotating shaft is fixedly sleeved with a disc, and the disc has a through hole.

[0012] Preferably, a support plate is fixedly connected to the side wall of the sand outlet pipe, a second motor is fixedly connected to the top surface of the support plate, a rotating shaft is fixedly connected to the output end of the second motor, a second disc is fixedly connected to the bottom surface of the rotating shaft, and a second through hole is opened in the second disc.

[0013] Preferably, a groove is formed inside the rotating shaft, an electromagnet is fixedly connected to the inner wall of the groove, a telescopic rod is fixedly connected to the output end of the electromagnet, a spring is fixedly sleeved on the outer ring of the telescopic rod, one end of the spring is fixedly connected to the electromagnet, the other end of the spring is fixedly connected to a permanent magnet, a permanent magnet is fixed to the bottom surface of the telescopic rod, a brake pad is fixed to the bottom surface of the permanent magnet, and the brake pad is in contact with the rotating shaft.

[0014] Preferably, the demolding assembly includes a cavity formed in the machine body, two electric push rods are fixedly connected to the inner wall of the cavity, the output ends of the two electric push rods are fixedly connected to a top plate, and the output ends of the electric push rods are slidably connected to the lower mold.

[0015] This utility model has the following beneficial effects:

[0016] This device enables precise mold closing, effectively avoiding misalignment during the mold closing process, ensuring the coaxiality and positional accuracy of the mold cavity, and improving the forming accuracy of the pump body casting shell.

[0017] This device can quantitatively feed coated sand and precisely control the amount of coated sand in the sand-shooting cylinder to meet the process requirements for the production of pump body casting shells.

[0018] This device can effectively seal the material feeding channel and the sand shooting channel, and at the same time achieve the sealing protection of the sand shooting port, thus preventing leakage of coated sand during the sand shooting process from multiple aspects and ensuring the stability of the sand shooting pressure.

[0019] This device allows coated sand to be injected into the mold cavity at high speed under high pressure, and achieves secondary compaction of the coated sand through pressure holding operation, ensuring that the coated sand fills the cavity evenly, without gaps or missing material, which is suitable for the filling requirements of complex cavities of pump body castings.

[0020] This device automates processes such as mold closing, sand injection, and curing, reducing manual intervention and improving the overall production efficiency of the pump body casting with coated sand shell.

[0021] This mold enables mechanized and non-destructive demolding of the shell, replacing the traditional manual demolding method. It avoids the deformation, cracking, or even damage of the shell caused by uneven manual force, and improves the yield of coated sand shell molds for pump body castings.

[0022] The demolding assembly of this device uses dual electric push rods to synchronously drive the ejection action, ensuring uniform force during the ejection of the top plate, allowing the shell to be smoothly ejected from the mold cavity, further ensuring the integrity of the shell molding, reducing manual operation steps, improving the overall production efficiency of the coated sand shell of the pump body casting, and adapting to the needs of mass production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0025] Figure 3 This is an overall sectional view of the present invention.

[0026] Figure 4 This is a schematic diagram of the support frame, sand chamber, and sand-shooting assembly of this utility model.

[0027] Figure 5 For the present utility model Figure 4 Partial structural explosion Figure 1 .

[0028] Figure 6 For the present utility model Figure 4 Partial structural explosion Figure 2 .

[0029] Figure 7 For the present utility model Figure 4 Partial structural sectional view.

[0030] Figure 8 For the present utility model Figure 7 Enlarged structural diagram at point A in the middle.

[0031] Figure 9 This is a schematic diagram of the demolding component structure of this utility model.

[0032] In the diagram: 1. Machine body; 2. Lower mold; 21. Sand inlet; 22. Inner cavity sand core mold; 23. Vent hole; 3. Guide pillar; 4. Fixing plate; 5. Cylinder; 6. Slide plate; 61. Guide sleeve; 7. Upper mold; 8. Support frame; 9. Sand chamber; 10. Sand outlet pipe; 11. Arc-shaped contact plate; 12. Sand shooting assembly; 121. Mounting base; 122. Motor 1; 123. Lead screw; 124. Guide rod; 125. Slider; 126. Sand shooting cylinder; 261. Sand inlet hole; 262. Support Support block; 263, rotating shaft; 264, disc one; 265, through hole one; 127, sand injection pipe; 271, sand injection valve; 128, sealing cover; 129, disc two; 291, through hole two; 292, support plate; 293, motor two; 294, rotating shaft; 941, groove; 942, electromagnet; 943, telescopic rod; 944, spring; 945, permanent magnet; 946, brake pad; 13, demolding assembly; 131, cavity; 132, electric push rod; 133, top plate. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1: This example aims to address the problems encountered in the traditional pump body casting process involving coated sand, such as poor mold positioning accuracy leading to misalignment, difficulty in quantitatively dispensing of coated sand, and leakage during sand injection causing pressure loss. Ultimately, these issues result in uneven cavity filling and gaps / material shortages. Please refer to [link to relevant documentation]. Figure 1 - Figure 8A device for coating sand for pump body casting includes a body 1, a lower mold 2 fixedly connected to the surface of the body 1, four guide pillars 3 fixedly connected to the four corners of the body 1, a fixing plate 4 fixedly connected to the top surface of two sets of guide pillars 3, a cylinder 5 fixedly connected to the top surface of the fixing plate 4, a slide plate 6 fixedly connected to the output end of the cylinder 5, a plurality of guide sleeves 61 embedded in the slide plate 6, the plurality of guide sleeves 61 being slidably connected to the plurality of guide pillars 3, an upper mold 7 fixedly connected to the bottom surface of the slide plate 6, a plurality of sand inlets 21 opened on both the upper mold 7 and the lower mold 2, an inner cavity sand core mold 22 provided in both the upper mold 7 and the lower mold 2, and an exhaust hole 23 provided on both the upper mold 7 and the lower mold 2.

[0035] A support frame 8 is fixedly connected to the side wall of the body 1. A sand chamber 9 is fixedly connected to the top surface of the support frame 8. A sand outlet pipe 10 is connected to the bottom surface of the sand chamber 9. An arc-shaped contact plate 11 is fixedly connected to the side wall of the support frame 8. The arc-shaped contact plate 11 is used to limit and position the sand-shooting cylinder 126 in the sand-replenishing state, ensuring that the first disc 264 and the second disc 129 are coaxially aligned, ensuring accurate sand replenishment without deviation, and improving sealing and sand-shooting accuracy. A sand-shooting assembly 12 is installed on the support frame 8.

[0036] The sand-shooting assembly 12 includes a mounting base 121 fixedly connected to the side wall of the machine body 1. A motor 122 is fixedly connected to the side wall of the mounting base 121. A lead screw 123 is fixedly connected to the output end of the motor 122. A slider 125 is threadedly installed on the lead screw 123. Two guide rods 124 are symmetrically fixedly connected inside the mounting base 121. The slider 125 is slidably connected to the two guide rods 124.

[0037] A sand-shooting cylinder 126 is fixedly connected to the top surface of the slider 125. Two sand-shooting pipes 127 are connected to the side wall of the sand-shooting cylinder 126. A sand-shooting valve 271 is installed in each of the two sand-shooting pipes 127. A sealing cover 128 is fixedly connected to the end face of the two sand-shooting pipes 127. The sand-shooting pipes 127 are connected to the sand inlet 21. A sand inlet hole 261 is opened on the top surface of the sand-shooting cylinder 126. A support block 262 is fixedly connected to the side wall of the sand-shooting cylinder 126. A rotating shaft 263 is rotatably connected to the support block 262. A disc 264 is fixedly sleeved on the outer ring of the rotating shaft 263. A through hole 265 is opened in the disc 264.

[0038] A support plate 292 is fixedly connected to the side wall of the sand outlet pipe 10. A motor 293 is fixedly connected to the top surface of the support plate 292. A rotating shaft 294 is fixedly connected to the output end of the motor 293. A disc 129 is fixedly connected to the bottom surface of the rotating shaft 294. A through hole 291 is opened in the disc 129. A groove 941 is opened in the rotating shaft 294. An electromagnet 942 is fixedly connected to the inner wall of the groove 941. A telescopic rod 943 is fixedly connected to the output end of the electromagnet 942. A spring 944 is fixedly sleeved on the outer ring of the telescopic rod 943. One end of the spring 944 is fixedly connected to the electromagnet 942, and the other end of the spring 944 is fixedly connected to a permanent magnet 945. A permanent magnet 945 is fixedly fixed to the bottom surface of the telescopic rod 943. A brake pad 946 is fixedly fixed to the bottom surface of the permanent magnet 945. The brake pad 946 is in contact with the rotating shaft 263.

[0039] In this embodiment: First, the cavities of the upper mold 7, lower mold 2, and inner sand core mold 22 must be thoroughly cleaned to prevent impurities from affecting the shell molding accuracy. Then, the molds are preheated. This device achieves heating by embedding a zoned temperature-controlled heating plate inside the mold. This heating plate has a multi-zone independent temperature control structure, which can precisely control the temperature of each area of ​​the mold to the process range of 220–260℃ according to the curing requirements of different parts of the pump body casting, ensuring consistent temperature across all surfaces of the cavity. This allows the coated sand near the mold wall to be heated, melted, and solidified simultaneously, achieving uniform shell thickness molding. The specific circuit connections and temperature control logic of this heating method are existing technologies and will not be described in detail.

[0040] After preheating, start cylinder 5, such as... Figure 1 and Figure 3 As shown, the piston of cylinder 5 extends downward, driving the slide plate 6 to slide downward along the guide post 3, thereby causing the upper mold 7 to press down and precisely close with the lower mold 2. The inner cavity sand core mold 22 is respectively set inside the upper mold 7 and the lower mold 2. After the molds are closed, they combine to form an integral inner cavity sand core structure, which together with the upper mold 7 and the lower mold 2 encloses the hollow shell cavity of the pump body. During the mold closing process, the sliding cooperation between the guide post 3 and the guide sleeve 61 provides stable guidance for the mold closing action, effectively preventing the upper mold 7 and the lower mold 2 from shifting when closing, ensuring the coaxiality and position of the mold cavity. After the mold is closed in place, the sand injection filling operation can be carried out.

[0041] During sand injection, in the initial state of sand replenishment, the sand injection cylinder 126 abuts against the arc-shaped contact plate 11 on the side wall of the support frame 8, achieving precise positioning and ensuring that the first disc 264 and the second disc 129 remain coaxially aligned, guaranteeing unobstructed and leak-free sand replenishment channels. Figure 4As shown, the second disc 129 on the bottom surface of the sand outlet pipe 10 and the first disc 264 on the top surface of the sand-shooting cylinder 126 are in close contact, and the first through hole 265 of the first disc 264 and the second through hole 291 of the second disc 129 are aligned with each other. At this time, the coated sand stored in the sand silo 9 will enter the sand-shooting cylinder 126 through the sand outlet pipe 10, the second through hole 291 and the first through hole 265 in sequence by gravity, thus completing the quantitative sand replenishment operation of the sand-shooting cylinder 126.

[0042] When the amount of coated sand stored in the sand-shooting cylinder 126 reaches the required amount for the process, such as Figure 7 and Figure 8 As shown, when the electromagnet 942 is energized, the electromagnet 942 generates magnetic force to drive the telescopic rod 943 to extend downward, and the spring 944 is stretched simultaneously, causing the brake pad 946 to fit tightly against the rotating shaft 263. With the help of the friction between the brake pad 946 and the rotating shaft 263, the rotating shaft 263 and the rotating shaft 294 form relative braking, ensuring that the rotating shaft 294 can rotate synchronously with the rotating shaft 263.

[0043] Next, motor 293 is started. The output end of motor 293 drives the rotating shaft 294 to rotate, which in turn drives disc 229 and disc 124 to rotate synchronously until through hole 125 and sand inlet hole 261 of sand-shooting cylinder 126 are misaligned, and through hole 291 and discharge port of sand outlet pipe 10 are misaligned. At this time, disc 124 seals the sand inlet hole 261 of sand-shooting cylinder 126, and disc 229 seals the discharge port of sand outlet pipe 10, effectively preventing leakage of coated sand or pressure loss during subsequent sand-shooting process and ensuring stable sand-shooting pressure.

[0044] Then, motor 122 is started. The output end of motor 122 drives the lead screw 123 to rotate. The lead screw 123 drives the slider 125 to slide smoothly along the guide rod 124 towards the mold. The sand injection tube 126 disengages from the arc-shaped contact plate 11 and moves closer to the sand inlet 21 of the mold. At the same time, the sealing cover 128 at the end of the sand injection tube 127 is tightly attached to the outside of the sand inlet 21. Through the sealing effect of the sealing cover 128, the coating sand is prevented from leaking from the sand inlet 21 during sand injection.

[0045] After the seal is in place, the sand-shooting valve 271 is opened. Under the drive of high-pressure gas, the coated sand in the sand-shooting cylinder 126 is injected at high speed through the sand-shooting pipe 127 and the sand inlet 21 into the cavity formed by the upper mold 7, the lower mold 2 and the inner cavity sand core mold 22. The upper mold 7, the lower mold 2 and the inner cavity sand core mold 22 are all provided with exhaust holes 23. During sand shooting, the gas in the cavity is quickly discharged to prevent air holes and material shortage in the pump body flow channel and deep cavity, while ensuring that the sand filling compaction is consistent.

[0046] The sand shooting pressure can be flexibly adjusted through the supporting pressure regulating unit, with an adjustment range of 0.3 - 0.6 MPa, and it can be adaptively adjusted according to the filling requirements of the complex cavity of the pump body casting. After the sand shooting is completed, the preset pressure is maintained for 3 - 8 s to perform secondary compaction on the coated sand in the cavity by using the residual air pressure, ensuring that the coated sand is evenly filled in the cavity without voids or material shortages, fully meeting the filling requirements of the complex cavity of the pump body casting. Since the pressure regulating unit配套设置 with the sand shooting cylinder 126 belongs to the prior art, its specific structure is not elaborated in detail.

[0047] During the sand shooting process, the mold remains fixed and does not rotate, ensuring stable sand shooting and uniform filling; in the crust solidification stage, the constant temperature mold and precise crust solidification time are relied on to control the uniform shell thickness. After the coated sand is completely filled into the mold cavity, it is continuously heated through the partition temperature control heating plate on the mold to achieve the crust solidification of the coated sand, and the crust solidification time is precisely controlled according to the shell thickness requirement to ensure that the shell layer thickness is uniform.

[0048] After curing, the loose sand is removed by the mold swinging or flipping action to empty the uncured loose sand; then secondary curing is carried out, and it is heated for another 60 - 120 s to make the shell layer completely hardened and the strength uniform, further enhancing the overall strength of the shell mold; after the secondary curing is completed, the mold is kept in the closed state and naturally cooled to below 100 °C to complete the pressure maintaining and shaping process, effectively enhancing the overall strength of the shell mold and avoiding problems such as deformation and cracking of the shell mold due to rapid cooling. The mechanisms related to removing loose sand and secondary curing belong to the prior art and are not the main innovations, so their structures are not elaborated in detail.

[0049] Embodiment 2: This embodiment aims to facilitate the solution of the problem that after the coated sand shell making for traditional pump body castings is completed, the demolding operation mostly relies on manual labor, which is prone to cause deformation, cracking or even damage of the shell mold due to uneven force application, resulting in a low yield rate of the shell mold. This embodiment is an improvement based on Embodiment 1. Specifically, please refer to Figure 3 and Figure 9 , a demolding component 13 is installed in the machine body 1. The demolding component 13 includes a cavity 131 opened in the machine body 1. Two electric push rods 132 are fixedly connected to the inner wall of the cavity 131. The output ends of the two electric push rods 132 are fixedly connected with a top plate 133, and the output ends of the electric push rods 132 are slidably connected to the lower mold 2.

[0050] In this embodiment: After the procedures of sand shooting and filling, crust solidification, removing loose sand, secondary curing and cooling of the coated sand are completed by using this device, the formed coated sand shell mold enters the demolding stage. First, the air cylinder 5 is started, and the output end of the air cylinder 5 retracts upward, driving the sliding plate 6 to slide upward along the guide column 3, so that the upper mold 7 moves upward and separates from the lower mold 2 and the inner cavity sand core mold 22, completing the mold opening operation.

[0051] As Figure 3As shown, after the mold is opened, the demolding assembly 13 is activated, and the two electric push rods 132 on the inner wall of the cavity 131 are started. The two electric push rods 132 extend upward synchronously, driving the top plate 133 to move upward smoothly. The top plate 133 pushes the formed shell in the cavity of the lower mold 2 evenly, and pushes the shell out smoothly from the cavity of the lower mold 2, realizing the automatic and non-destructive demolding of the shell.

[0052] During demolding, the dual electric push rods 132 maintain synchronous drive, ensuring balanced force on the top plate 133 and smooth ejection. This effectively avoids problems such as deformation, cracking, and damage to the shell mold caused by uneven force, significantly improving the shell mold yield. After demolding, the shell mold can be further trimmed and its dimensional accuracy inspected. Once qualified, it can be used for the casting production of pump body parts. The entire demolding process requires no manual intervention, has a high degree of automation, and greatly improves the production efficiency of coated sand shells for pump body castings, adapting to the needs of mass production.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A coating device for core sand of a pump body casting, comprising a machine body (1), characterized in that: The machine body (1) is fixedly connected to a lower mold (2), and four guide pillars (3) are fixedly connected to the four corners of the machine body (1). The top surfaces of the two sets of guide pillars (3) are fixedly connected to a fixing plate (4). The top surface of the fixing plate (4) is fixedly connected to a cylinder (5). The output end of the cylinder (5) is fixedly connected to a sliding plate (6). The bottom surface of the sliding plate (6) is fixedly connected to an upper mold (7). Both the upper mold (7) and the lower mold (2) are provided with multiple sand inlets (21). Both the upper mold (7) and the lower mold (2) are provided with an inner cavity sand core mold (22). Both the upper mold (7) and the lower mold (2) are provided with exhaust holes (23). A support frame (8) is fixedly connected to the side wall of the machine body (1), a sand hopper (9) is fixedly connected to the top surface of the support frame (8), a sand outlet pipe (10) is connected to the bottom surface of the sand hopper (9), an arc-shaped contact plate (11) is fixedly connected to the side wall of the support frame (8), a sand shooting assembly (12) is installed on the support frame (8), and a demolding assembly (13) is installed inside the machine body (1).

2. The core sand coating apparatus for pump body castings according to claim 1, wherein: Multiple guide sleeves (61) are embedded and fixed on the slide plate (6), and the multiple guide sleeves (61) are slidably connected to the multiple guide posts (3).

3. The core sand coating apparatus for pump body castings according to claim 1, wherein: The sand-shooting assembly (12) includes a mounting base (121) fixedly connected to the side wall of the machine body (1). A motor (122) is fixedly connected to the side wall of the mounting base (121). A lead screw (123) is fixedly connected to the output end of the motor (122). A slider (125) is threaded onto the lead screw (123). Two guide rods (124) are symmetrically fixedly connected inside the mounting base (121). The slider (125) is slidably connected to the two guide rods (124).

4. The core sand coating apparatus for pump body castings according to claim 3, wherein: The top surface of the slider (125) is fixedly connected to a sand-shooting cylinder (126). The side wall of the sand-shooting cylinder (126) is connected to two sand-shooting pipes (127). Each of the two sand-shooting pipes (127) is equipped with a sand-shooting valve (271). The end faces of the two sand-shooting pipes (127) are fixedly connected to a sealing cover (128). The sand-shooting pipes (127) are connected to the sand inlet (21).

5. The core sand coating apparatus for pump body castings according to claim 4, wherein: The top surface of the sand-shooting cylinder (126) is provided with a sand inlet hole (261). A support block (262) is fixedly connected to the side wall of the sand-shooting cylinder (126). A rotating shaft (263) is rotatably connected to the support block (262). A disc (264) is fixedly sleeved on the outer ring of the rotating shaft (263). A through hole (265) is provided inside the disc (264).

6. A pump body casting coated sand curing apparatus as defined in claim 5, wherein: The side wall of the sand outlet pipe (10) is fixedly connected to a support plate (292), the top surface of the support plate (292) is fixedly connected to a motor (293), the output end of the motor (293) is fixedly connected to a rotating shaft (294), the bottom surface of the rotating shaft (294) is fixedly connected to a disc (129), and a through hole (291) is opened in the disc (129).

7. A core sand curing apparatus for a pump body casting according to claim 6 wherein: A groove (941) is provided inside the rotating shaft (294). An electromagnet (942) is fixedly connected to the inner wall of the groove (941). A telescopic rod (943) is fixedly connected to the output end of the electromagnet (942). A spring (944) is fixedly sleeved on the outer ring of the telescopic rod (943). One end of the spring (944) is fixedly connected to the electromagnet (942), and the other end of the spring (944) is fixedly connected to a permanent magnet (945). A permanent magnet (945) is fixed to the bottom surface of the telescopic rod (943), and a brake pad (946) is fixed to the bottom surface of the permanent magnet (945). The brake pad (946) is in contact with the rotating shaft (263).

8. The core sand coating apparatus for pump body castings according to claim 1, wherein: The demolding assembly (13) includes a cavity (131) opened in the body (1). Two electric push rods (132) are fixedly connected to the inner wall of the cavity (131). The output ends of the two electric push rods (132) are fixedly connected to a top plate (133). The output ends of the electric push rods (132) are slidably connected to the lower mold (2).

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