Sand making device for casting automobile brake caliper body

Abstract

The present application relates to the field of foundry sand making, and particularly relates to a sand making device for automobile brake caliper body casting, which comprises screening units, premixing units, lifting units, adding units and mixing units arranged in series. The screening units crush and screen the caked sand through vibration and reciprocating sliding mechanism; the premixing units control the mixing ratio of old sand and new sand and preliminarily mix them through the distribution plate and adjustable valve; the lifting units deliver the premixed sand to the adding units; the adding units realize the quantitative addition of premixed sand and auxiliary materials through the auger; the mixing units realize the uniform mixing of materials through the obliquely arranged mixing barrel, bidirectional rotating mixing paddle and auxiliary stirring head, and are provided with a manually controlled discharging mechanism. The device realizes the efficient screening, accurate batching, uniform mixing and convenient discharging of the sand, and improves the preparation efficiency and quality stability of the sand for brake caliper body casting.

Description

Technical Field

[0001] This invention relates to the field of casting sand making, and more particularly to a sand making device for casting automotive brake caliper bodies. Background Technology

[0002] As a critical safety component of a vehicle's braking system, the casting quality of automotive brake calipers directly impacts braking performance and driving safety. These parts are typically manufactured using precision casting processes, with molding sand, the primary forming material for the casting mold, playing a crucial role in the stability of its properties. Currently, the coated sand process is widely used in brake caliper casting. This process uses high-purity zircon sand or high-quality quartz sand as the raw sand, heating it to coat its surface with binders such as phenolic resin, forming a shell mold with high strength and heat resistance. After casting, the sand mold partially collapses during high-temperature pouring, generating a large amount of used sand. To achieve resource conservation and cost control, the used sand is usually roasted to remove residual resin, then screened and recycled, and mixed with new sand in a certain proportion for reuse.

[0003] In existing technologies, the recycling and reuse of molding sand typically involves multiple independent stages. First, the calcined used sand is screened to remove impurities and excessively fine dust. However, because used sand is prone to sintering and agglomeration under high temperatures, conventional vibrating screening equipment is inefficient and cannot effectively handle lumpy sand clumps, resulting in uneven particle size in the recycled sand and affecting subsequent coating effects. Second, the mixing of used and new sand often relies on simple mechanical stirring or manual proportioning, leading to imprecise ratio control, difficulty in maintaining consistent performance of the molding sand system, and limited mixing uniformity. Furthermore, in the final mixing stage, various auxiliary materials such as curing agents and lubricants need to be added to the base sand while controlling the appropriate amount of moisture. Existing equipment often suffers from inaccurate addition, insufficient mixing, and uneven moisture distribution, causing fluctuations in key indicators such as molding sand strength and permeability. The discharge of mixed molding sand also often suffers from residue, blockage, or incomplete discharge due to unreasonable equipment design, affecting continuous production rhythm and material utilization. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a sand-making device for casting automotive brake calipers. By setting up a screening unit with the function of squeezing and crushing agglomerates, a premixing unit that can premix new and old sand in proportion, and an inclined mixing unit equipped with a bidirectional rotating mixing paddle, the invention solves the technical problems of low old sand recycling screening efficiency, inaccurate control of the ratio of new and old sand, and low efficiency of the mixing and discharging process. Specifically, this is achieved through the following technical solutions.

[0005] The present invention provides a sand making device for casting automotive brake caliper bodies, comprising a screening unit, a premixing unit, a lifting unit, an adding unit, and a mixing unit arranged in series.

[0006] The screening unit includes a screening bin, a screen plate disposed inside the screening bin, and a vibration motor that drives the screening bin to vibrate. A sliding rod assembly capable of relative movement is disposed above the screen plate for crushing and extruding agglomerated molding sand.

[0007] The molding sand screened by the screening unit is conveyed to the premixing unit, which is used to premix the new sand and the screened molding sand in proportion.

[0008] The lifting unit is disposed between the premixing unit and the adding unit, and is used to lift and transport the premixed sand output from the premixing unit to the adding unit. The adding unit is used to quantitatively add the premixed sand and auxiliary materials to the mixing unit.

[0009] The mixing unit includes a mixing drum with its axis inclined and a mixing paddle disposed inside the mixing drum. The mixing paddle can rotate in both directions to drive the material to converge during the mixing stage and assist the material to be discharged during the discharge stage. The mixing unit also includes an atomizing nozzle for adding water to the mixing drum.

[0010] Preferably, the sliding rod group includes two parallel mounting rods and a plurality of sliding rods fixed on each mounting rod. In the same sliding rod group, the sliding rods fixed on different mounting rods are arranged at intervals.

[0011] A support plate fixed to the upper surface of the sieve plate is provided below the sliding rod;

[0012] The screening unit also includes a driving mechanism, which drives the mounting rod to slide back and forth along the length of the screening chamber, causing relative movement between the sliding rods in the same group.

[0013] Preferably, the drive mechanism includes a V-shaped rod, an electric telescopic rod, and a connecting rod;

[0014] The middle part of the V-shaped rod is hinged to the end of the screening chamber;

[0015] The first end of the connecting rod is fixedly connected to the mounting rod, and the second end of the connecting rod is equipped with a connecting bolt, which is slidably disposed in the elongated hole opened at the end of the V-shaped rod;

[0016] The output end of the electric telescopic rod is equipped with a long guide rail, and a drive pin is slidably arranged inside the long guide rail. The drive pin is fixedly connected to one side of the V-shaped rod.

[0017] Preferably, the premixing unit includes a hopper, a distribution plate, a feed pipe, a regulating valve, and a spiral tube;

[0018] The material distribution plate is vertically installed inside the hopper, dividing it into two independent chambers;

[0019] The bottom of each of the two chambers is connected to a feed pipe, and each feed pipe is equipped with a regulating valve;

[0020] The bottom of both feed tubes is connected to the top of the spiral tube.

[0021] Preferably, the lifting unit is a bucket elevator or a screw conveyor.

[0022] Preferably, the adding unit includes a hopper, an auger, a first motor, and a first gearbox;

[0023] The hopper is connected to one side of the auger, and the first motor drives the screw inside the auger to rotate through the first gearbox. The other side of the auger is provided with a second discharge port.

[0024] Preferably, the mixing unit further includes a stirring motor fixed to the top cover of the mixing tank, the output end of the stirring motor extending into the mixing tank and connected to a stirring head.

[0025] Preferably, the mixing unit further includes a discharge mechanism disposed on the side wall at the lowest point of the mixing tank;

[0026] The discharge mechanism includes a discharge channel formed in the side wall, a baffle for opening and closing the discharge channel, and a drive rod and a swing rod for driving the baffle to slide.

[0027] The first end of the swing rod is hinged to the side wall of the mixing tank, the second end of the swing rod is provided with a handle, the middle part of the swing rod is hinged to one end of the drive rod, and the other end of the drive rod is hinged to the baffle.

[0028] Preferably, the screening chamber is mounted on a support base by several springs, and the bottom of the screening chamber is provided with a first discharge port.

[0029] After adopting the above technical solution, the beneficial effects of the present invention are:

[0030] 1. The screening is driven by a vibrating motor in the screening chamber, and the sliding rod driven by the electric telescopic rod reciprocates. During the screening process, the agglomerated molding sand is squeezed and crushed, which effectively solves the problem that old sand is difficult to screen and reuse directly due to high temperature sintering and agglomeration. It not only speeds up the screening speed, but also ensures the uniformity and dispersion of the particle size of the reused molding sand, providing a good foundation for subsequent sand mixing.

[0031] 2. The premixing unit uses a hopper structure to separate new and old sand, and each hopper has a regulating valve in its respective feed pipeline to precisely control the feed ratio of old and new sand. Initial mixing is achieved through a spiral tube. This structure can compensate for the loss of old sand during recycling, stabilize the composition and performance of the molding sand system, and ensure the production of highly consistent molding sand.

[0032] 3. The mixing unit uses an inclined mixing drum, coupled with a reversible mixing paddle and auxiliary stirring head. Forward rotation causes sand particles to converge towards the center for enhanced mixing, while reverse rotation causes the sand particles to spread outwards, facilitating their convergence towards lower points. Combined with a manually controlled baffle-type discharge mechanism, the mixing process is fully uniform, and the discharge process is smooth and controllable, effectively preventing material residue and blockage during unloading.

[0033] 4. By setting up multiple independent addition units for the storage and conveying of materials such as premixed sand, curing agent, and lubricant, each unit uses a motor-driven auger structure to achieve quantitative feeding. This modular design allows for independent and precise control of the addition ratio of various materials, ensuring a high degree of accuracy and repeatability of the final molding sand formula.

[0034] 5. An atomizing nozzle is integrated in the middle of the top cover of the mixing unit, which can spray water evenly into the molding sand in the form of atomization during the mixing process. This allows the water to fully contact and penetrate the sand particles and auxiliary materials, avoiding local over-wetting or clumping, and achieving precise and uniform control of the overall humidity of the molding sand. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the installation of a sand-making device for casting automotive brake caliper bodies;

[0037] Figure 2 This is a 3D view of the screening unit;

[0038] Figure 3 for Figure 2 A three-dimensional view of the middle section structure;

[0039] Figure 4 for Figure 3 Side view;

[0040] Figure 5 for Figure 3 A magnified view of part A in the middle;

[0041] Figure 6 This is a schematic diagram of the premixing unit.

[0042] Figure 7 A schematic diagram of the structure with added units;

[0043] Figure 8 This is a schematic diagram of the hybrid unit structure;

[0044] Figure 9 for Figure 8 A longitudinal sectional view;

[0045] Figure 10 for Figure 8 A cross-sectional view;

[0046] Figure 11 for Figure 8 A magnified view of part B in the middle.

[0047] Explanation of reference numerals in the attached figures:

[0048] 100-Screening unit, 101-Screening bin, 102-Spring, 103-Support base, 104-Vibration motor, 105-Screen plate, 106-First discharge port, 107-First guide rail, 108-Mounting rod, 109-Sliding rod, 110-Support plate, 111-Connecting rod, 112-Connecting bolt, 113-Elongated hole, 114-V-shaped rod, 115-Drive pin, 116-Elongated guide rail, 117-Electric telescopic rod;

[0049] 200-Premixing unit, 201-Hopper, 202-Distribution plate, 203-Feed pipe, 204-Regulating valve, 205-Spiral tube;

[0050] 300-lifting unit;

[0051] 400 - Adding unit, 401 - Hopper, 402 - Screwdriver, 403 - First motor, 404 - First gearbox, 405 - Second discharge port;

[0052] 500-Mixing unit, 501-Mixing bucket, 502-Support bucket, 503-Top cover, 504-Feeding channel, 505-Mixing motor, 506-Mixing head, 507-Atomizing nozzle, 508-Second motor, 509-Second gearbox, 510-Mixing paddle, 511-Guide groove, 512-Second guide rail, 513-Baffle, 514-Drive rod, 515-Swing rod, 516-Handle. Detailed Implementation

[0053] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0054] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the invention. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] An embodiment of the present invention provides a sand-making device for casting automotive brake caliper bodies, see [link / reference]. Figure 1 The sand making device for casting automotive brake calipers includes a screening unit 100, a premixing unit 200, a lifting unit 300, an adding unit 400, and a mixing unit 500 arranged in series.

[0056] The screening unit 100 is used to screen and reuse the old sand recovered after casting, and before screening, it crushes some of the agglomerated molding sand to ensure the uniformity and dispersion of the molding sand.

[0057] After being screened by screening unit 100, the molding sand is transported to premixing unit 200 by the first set of lifting augers. In addition, the second set of lifting augers transports new sand to the inlet of premixing unit 200. The recycled molding sand and new sand are premixed in premixing unit 200 to form premixed sand.

[0058] The premixed sand is lifted to a height by the lifting unit 300 and transported to the inlet of the first group of adding units 400. The first group of adding units 400 adds the sand quantitatively into the mixing unit 500. In addition, several other groups of adding units 400 are provided to quantitatively add auxiliary materials such as curing agents and lubricants into the mixing unit 500.

[0059] The mixing unit 500 is used to uniformly mix premixed sand and several auxiliary materials, and to add water quantitatively during the mixing process, thereby controlling the humidity of the final molding sand.

[0060] For a further explanation of the above embodiments, see Figures 2-4The screening unit 100 includes a screening chamber 101. The side of the screening chamber 101 is mounted on a support base 103 by several springs 102. A vibration motor 104 is also fixedly installed on the side of the screening chamber 101. A screen plate 105 is fixedly installed in the horizontal direction inside the screening chamber 101. A first discharge port 106 communicating with the inside of the screening chamber 101 is installed at the bottom of the screening chamber 101.

[0061] During the screening process of molding sand, the screening unit 100 drives the screening chamber 101 to vibrate through the vibration motor 104, so that the molding sand contained in the screening chamber 101 passes through the screen holes of the screen plate 105 and is discharged outward through the first discharge port 106.

[0062] Inside the screening chamber 101, above the screen plate 105, are several first guide rails 107 arranged along the length of the screening chamber 101. Inside the first guide rails 107, there are mounting rods 108 slidably arranged. On one side of the mounting rods 108, several sliding rods 109 are evenly fixedly installed along their length. The lower surface of the middle part of the sliding rods 109 overlaps with the top of the support plate 110. The support plate 110 is fixedly installed on the upper surface of the screen plate 105.

[0063] Among them, the first end of several sliding rods 109 is fixedly connected to the mounting rod 108, the second end of the sliding rods 109 is suspended in the air, and all sliding rods 109 are horizontally set and in the same horizontal plane.

[0064] The structure consisting of mounting rod 108 and several sliding rods 109 is arranged in pairs facing each other, and the sliding rods 109 fixed on different mounting rods 108 in the same group are spaced apart. Multiple groups of the above structure are arranged along the width direction of the screening chamber 101.

[0065] The screening chamber 101 is divided into several spatial regions along the width direction by the first guide rail 107 as the dividing line. Each spatial region is provided with a set of the above-mentioned structures, that is, each spatial region is provided with two mounting rods 108, and several sliding rods 109 fixedly installed on the two mounting rods 108 are all arranged between the two mounting rods 108.

[0066] The end of the screening chamber 101 is provided with a driving mechanism, which drives several mounting rods 108 to slide back and forth along the length of the first guide rail 107, so that several sliding rods 109 fixed on different mounting rods 108 in the same group move relative to each other, periodically forming loose and dense areas, thereby squeezing and crushing the blocky molding sand above the screen plate 105.

[0067] In addition, the reciprocating sliding of several sliding rods 109, combined with the vibration of the screening chamber 101, can accelerate the screening and discharge speed of molding sand, thereby improving the efficiency of molding sand screening.

[0068] For a further explanation of the above embodiments, see Figure 3 , Figure 5 The drive mechanism includes a connecting rod 111. The first end of the connecting rod 111 is fixed to the mounting rod 108. The middle part of the connecting rod 111 passes through the end of the screening chamber 101. A connecting bolt 112 is fixedly installed on the second end of the connecting rod 111. The connecting bolt 112 is slidably disposed in the elongated hole 113. The elongated hole 113 is opened at the first end of the V-shaped rod 114. The middle part of the V-shaped rod 114 is hinged to the end of the screening chamber 101.

[0069] The structure consisting of connecting rod 111, connecting bolt 112, and elongated hole 113 is symmetrically distributed in two groups about the middle of V-shaped rod 114, and the connecting rod 111 of the other group is fixed to another mounting rod 108.

[0070] One side of the V-shaped rod 114 is fixedly connected to the drive pin 115. The drive pin 115 is slidably disposed in the long guide rail 116. The long guide rail 116 is fixedly connected to the output end of the electric telescopic rod 117. The electric telescopic rod 117 is fixedly installed at the end of the screening chamber 101.

[0071] Because the casting of automotive brake calipers usually involves mixing high-quality raw sand with binders such as phenolic resin, the resin is heated to melt and coat the surface of the sand grains, forming coated sand. The raw sand is mostly high-purity zircon sand or high-quality quartz sand. After casting, the sand mold partially collapses after high temperature, but a large amount of agglomerated sand still needs to be roasted. After roasting, it is screened and recycled.

[0072] Before the molding sand is screened, the above structure drives the V-shaped rod 114 to swing along its hinge axis via the electric telescopic rod 117, and further drives the two sets of connecting rods 111 and mounting rods 108 to slide back and forth through the configuration relationship between the connecting bolts 112 and the elongated hole 113. The reciprocating sliding of the mounting rod 108 smoothly drives the reciprocating motion of the sliding rod 109, thereby realizing the above-mentioned functions of crushing and promoting screening.

[0073] For a further explanation of the above embodiments, see Figure 6 The premixing unit 200 includes a hopper 201 and a distribution plate 202 vertically arranged inside the hopper 201. The distribution plate 202 divides the hopper 201 into two independent chambers. One chamber is located below the outlet of the first set of lifting augers and is used to hold the screened molding sand. The other chamber is located below the outlet of the second set of lifting augers and is used to hold the new sand.

[0074] Two feed pipes 203 are installed at the bottom of the hopper 201. The two feed pipes 203 are connected to the two chambers of the hopper 201 one-to-one. A regulating valve 204 is fixedly installed in the middle of each feed pipe 203. The regulating valve 204 is used to adjust the opening degree, thereby adjusting the feeding ratio of the screened molding sand and the new sand. The bottom of the two feed pipes 203 is fixedly connected to the top of the spiral pipe 205. The spiral pipe 205 is used to realize the premixing of the screened molding sand and the new sand. A material box is set at the bottom of the spiral pipe 205 for collecting and holding the premixed sand.

[0075] After the molding sand has been roasted and screened, it must be mixed with new sand in a predetermined ratio during the recycling process to compensate for the loss of old sand during use and to stabilize the stability of the molding sand system.

[0076] With the structure described above in this embodiment, the screened old sand and new sand are respectively conveyed to the two chambers of the hopper 201 through different lifting screws, and then conveyed to the spiral tube 205 through the feed pipes 203 installed at the bottom of the chambers. The ratio of old sand to new sand is controlled by adjusting the opening of the regulating valves 204 installed on the two feed pipes 203. As the old sand and new sand flow downward in the spiral tube 205, they impact and tumble with each other, achieving preliminary mixing.

[0077] The premixed sand formed by mixing old sand and new sand is temporarily stored in the hopper and then transferred and lifted by the lifting unit 300 to the adding unit 400 to complete the subsequent quantitative addition of the premixed sand.

[0078] The lifting unit 300 can be a bucket elevator, a screw conveyor, or other mechanism that can lift and transfer molding sand. This technology is a conventional technology known to those skilled in the art and will not be described in detail here.

[0079] For a further explanation of the above embodiments, see Figure 7 The adding unit 400 includes a hopper 401, which is fixedly connected to one side of the auger 402. A first gearbox 404 is provided at one end of the auger 402 near the hopper 401. The output end of the first gearbox 404 is coaxially fixed with the auger 402 and is used to drive the auger 402 to complete the material conveying. The input end of the first gearbox 404 is coaxially fixed with the output end of the first motor 403. The bottom of the other side of the auger 402 is fixedly connected to a second discharge port 405, which is used to output materials outward.

[0080] In this embodiment, the screw inside the auger 402 is driven to rotate by the first motor 403 and the first gearbox 404 in the above structure, thereby conveying the material stored in the hopper 401 along the axial direction of the auger 402 to the second discharge port 405, and outputting it outward through the second discharge port 405.

[0081] By controlling the rotation time and speed of the first motor 403 in the above structure, the quantitative addition of materials can be achieved. Therefore, by using multiple sets of addition units 400 in cooperation with each other, the accurate addition of molding sand in the final proportion can be achieved.

[0082] For a further explanation of the above embodiments, see Figure 8 , Figure 9 The mixing unit 500 includes a mixing tank 501 and a support tank 502 disposed below the mixing tank 501. The axis of the support tank 502 is vertically arranged, while the axis of the mixing tank 501 is inclined.

[0083] A top cover 503 is coaxially fixedly installed on the top of the mixing tank 501. Several feeding channels 504 are fixedly installed on the top cover 503. The feeding channels 504 are all connected to the inside of the mixing tank 501. Different feeding channels 504 are used to add different materials into the mixing tank 501.

[0084] An atomizing nozzle 507 is fixedly installed in the middle of the top cover 503. The outlet of the atomizing nozzle 507 passes through the top cover 503 and is located inside the mixing tank 501. The inlet of the atomizing nozzle 507 is fixedly connected to an external water supply pipe. The atomizing nozzle 507 is used to atomize the water input from the external water supply pipe and spray the atomized water into the mixing tank 501 to adjust the humidity during molding sand mixing.

[0085] Several stirring motors 505 are fixedly installed on the higher side of the top cover 503. The output end of the stirring motor 505 passes through the top cover 503 and is disposed inside the mixing tank 501. A stirring head 506 is coaxially fixedly installed at the bottom of the output end of the stirring motor 505. The stirring head 506 is used for auxiliary stirring during the sand mixing process.

[0086] A second motor 508 is fixedly installed inside the support barrel 502. The output end of the second motor 508 is coaxially fixed with the input end of the second gearbox 509. The output end of the second gearbox 509 is coaxially fixed with the mixing paddle 510 through a rotating shaft that penetrates the bottom of the mixing paddle 510. The mixing paddle 510 is located inside the mixing barrel 501 and is coaxially arranged with the mixing barrel 501.

[0087] The mixing paddle 510 has a cylindrical body in the middle, with several arc-shaped blades evenly fixed around its circumference. This structure facilitates the mixing of molding sand inside the mixing bucket 501 and the discharge of materials after the molding sand mixing is completed.

[0088] During the molding sand mixing process, the second motor 508 drives the mixing paddle 510 to rotate in the forward direction via the second gearbox 509, and its rotation direction is as follows: Figure 10In the clockwise direction, due to the action of several arc-shaped blades, the molding sand inside the mixing drum 501 tends to converge from the periphery to the center. Combined with the stirring heads 506 driven by multiple stirring motors 505, this process completes the tumbling and mixing of the molding sand inside the mixing drum 501, ensuring the uniform mixing of various materials in the molding sand. When the molding sand is fully mixed and needs to be discharged, the second motor 508 drives the mixing paddle 510 to rotate in the opposite direction through the second gearbox 509. The direction of rotation is as follows: Figure 10 In the counterclockwise direction, under the action of several arc-shaped blades, the molding sand in the mixing bucket 501 tends to disperse from the center to the surrounding area. Combined with the inclined setting of the mixing bucket 501, the molding sand in the mixing bucket 501 is more likely to accumulate at the lowest point of the mixing bucket 501, which facilitates the discharge of materials.

[0089] For a further explanation of the above embodiments, see Figure 11 A discharge mechanism is installed at the lowest point on the outside of the mixing drum 501 to intermittently discharge the material inside the mixing drum 501.

[0090] The mixing drum 501 has a discharge channel on the side wall at its lowest point. A guide groove 511 is fixedly installed on the lower side of the discharge channel to guide the material discharged through the discharge channel. A second guide rail 512 parallel to the axis of the mixing drum 501 is fixedly installed on both sides of the discharge channel. A baffle 513 is slidably arranged in the two second guide rails 512, and the baffle 513 can completely block the discharge channel.

[0091] The outer side of the baffle 513 is hinged to the first end of the drive rod 514, the second end of the drive rod 514 is hinged to the middle of the swing rod 515, the first end of the swing rod 515 is located directly above the baffle 513 and is hinged to the side wall of the mixing tank 501, and a handle 516 is fixedly installed on the second end of the swing rod 515. The handle 516 is used to drive the swing rod 515 to swing around its hinge axis.

[0092] The above-described structure of this embodiment facilitates the discharge of materials by the operator controlling the handle 516. When it is necessary to discharge the materials inside the mixing tank 501, the operator only needs to drive the handle 516 to rotate the swing rod 515 upwards. Under the action of the swing rod 515 and the drive rod 514, the baffle 513 will slide upwards. At this time, the discharge channel is opened, and the materials inside the mixing tank 501 are output outwards through the material channel under the driving action of the mixing paddle 510. When it is necessary to block the material channel and complete the mixing of materials inside the mixing tank 501, the operator only needs to drive the handle 516 to rotate the swing rod 515 downwards, and the baffle 513 will be used to re-block the discharge channel.

[0093] The embodiments described above are not exhaustive, nor do they limit the invention to any specific embodiments. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to effectively utilize the invention and its modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A sand-making device for casting automotive brake caliper bodies, characterized in that, It includes a screening unit (100), a premixing unit (200), a lifting unit (300), an adding unit (400), and a mixing unit (500) arranged in series. The screening unit (100) includes a screening chamber (101), a screen plate (105) disposed inside the screening chamber (101), and a vibration motor (104) for driving the screening chamber (101) to vibrate. A sliding rod assembly capable of relative movement is disposed above the screen plate (105) for crushing agglomerated molding sand. The sieved molding sand from the screening unit (100) is transported to the premixing unit (200), which is used to premix the new sand and the sieved molding sand in proportion. The lifting unit (300) is disposed between the premixing unit (200) and the adding unit (400) for lifting the premixed sand output by the premixing unit (200) and conveying it to the adding unit (400). The adding unit (400) is used to quantitatively add the premixed sand and auxiliary materials to the mixing unit (500). The mixing unit (500) includes a mixing tank (501) with its axis inclined and a mixing paddle (510) disposed inside the mixing tank (501). The mixing paddle (510) can rotate in both directions to drive the material to converge during the mixing stage and assist the material to be discharged during the discharge stage. The mixing unit (500) also includes an atomizing nozzle (507) for adding water to the mixing tank (501). The sliding rod group includes two parallel mounting rods (108) and a number of sliding rods (109) fixed on each mounting rod (108). In the same sliding rod group, the sliding rods (109) fixed on different mounting rods (108) are arranged at intervals. A support plate (110) fixed to the upper surface of the sieve plate (105) is provided below the sliding rod (109). The screening unit (100) further includes a driving mechanism, which is used to drive the mounting rod (108) to slide back and forth along the length direction of the screening bin (101), so that the sliding rods (109) in the same group generate relative motion; The drive mechanism includes a V-shaped rod (114), an electric telescopic rod (117), and a connecting rod (111). The middle part of the V-shaped rod (114) is hinged to the end of the screening chamber (101); The first end of the connecting rod (111) is fixedly connected to the mounting rod (108), and the second end of the connecting rod (111) is equipped with a connecting bolt (112). The connecting bolt (112) is slidably disposed in the elongated hole (113) opened at the end of the V-shaped rod (114). The output end of the electric telescopic rod (117) is equipped with a long guide rail (116), and a drive pin (115) is slidably arranged inside the long guide rail (116). The drive pin (115) is fixedly connected to one side of the V-shaped rod (114).

2. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The premixing unit (200) includes a hopper (201), a distribution plate (202), a feed pipe (203), a regulating valve (204), and a spiral tube (205); The material distribution plate (202) is vertically arranged inside the hopper (201), dividing it into two independent chambers; The bottom of each of the two chambers is connected to a feed pipe (203), and each feed pipe (203) is provided with a regulating valve (204). The bottoms of both feed tubes (203) are connected to the top of the spiral tube (205).

3. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The lifting unit (300) is a bucket elevator or a screw conveyor.

4. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The adding unit (400) includes a hopper (401), an auger (402), a first motor (403), and a first gearbox (404). The hopper (401) is connected to one side of the auger (402), the first motor (403) drives the screw inside the auger (402) to rotate through the first gearbox (404), and the other side of the auger (402) is provided with a second discharge port (405).

5. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The mixing unit (500) also includes a stirring motor (505) fixed on the top cover (503) of the mixing tank (501), the output end of the stirring motor (505) extending into the mixing tank (501) and connected to a stirring head (506).

6. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The mixing unit (500) also includes a discharge mechanism located on the side wall at the lowest point of the mixing tank (501); The discharge mechanism includes a discharge channel opened on the side wall, a baffle (513) for opening and closing the discharge channel, and a drive rod (514) and a swing rod (515) for driving the baffle (513) to slide. The first end of the swing rod (515) is hinged to the side wall of the mixing barrel (501), the second end of the swing rod (515) is provided with a handle (516), the middle part of the swing rod (515) is hinged to one end of the drive rod (514), and the other end of the drive rod (514) is hinged to the baffle (513).

7. The sand-making device for casting automotive brake caliper bodies according to claim 1, characterized in that, The screening chamber (101) is mounted on the support base (103) by a number of springs (102), and the bottom of the screening chamber (101) is provided with a first discharge port (106).

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