Valve shell dewaxing device

Abstract

The utility model provides a valve formwork dewaxing device, including dewaxing kettle, be provided with the placing frame for placing wax mould in dewaxing kettle, the dewaxing kettle left side is connected with the collection box body that upper surface is open, the dewaxing kettle inner bottom rear end is equipped with the discharge port, the discharge port is connected with the collection box body through a discharge pipe and is set up, the left and right horizontal board of placing frame all are equipped with strip sliding mouth, the dewaxing kettle rear surface both ends all are equipped with synchronous motor, the output of synchronous motor is connected with screw rod, just the screw rod sets up in dewaxing kettle inner upper end, be provided with the pusher ring in dewaxing kettle, the pusher ring screw cover is established in screw rod, the pusher ring passes through strip sliding mouth setting, the utility model can realize the automatic waxing of preventing wax liquid solidification accumulation.

Description

Technical Field

[0001] This utility model relates to the technical field of investment casting equipment, and in particular to a valve mold shell dewaxing device. Background Technology

[0002] Investment casting, a key process for producing high-precision castings, relies heavily on the dewaxing stage during mold preparation, which directly impacts the final casting quality. Currently, the commonly used steam or hot water dewaxing equipment in industry suffers from two significant technical bottlenecks: First, during the collection of molten wax at the bottom of the traditional dewaxing vessel, the lack of effective temperature maintenance and flow support mechanisms causes the wax to solidify and accumulate at the discharge pipe and collection tank inlet, requiring frequent shutdowns for cleaning and resulting in substantial wax loss. Second, after dewaxing, operators must manually open the high-temperature vessel door to remove the mold assembly, a labor-intensive and inefficient process posing serious safety hazards. This is particularly problematic for valve-type precision castings, where the complex valve structure leads to dense wax pattern distribution. Traditional static wax removal methods struggle to ensure complete wax removal, and residual wax affects the yield of subsequent sintering processes. Furthermore, existing collection tanks are often simple containers, unable to process recovered wax immediately. This necessitates additional melting and filtration processes for wax reuse, increasing production costs and energy consumption. Summary of the Invention

[0003] In view of this, the purpose of this utility model is to provide a valve mold shell dewaxing device that can realize automated wax removal and prevent wax from solidifying and accumulating.

[0004] This utility model is implemented using the following method: a valve mold shell dewaxing device, including a dewaxing kettle, a placement rack for placing wax molds is provided inside the dewaxing kettle, a collection box with an open upper surface is connected to the left side of the dewaxing kettle, a discharge port is provided at the rear end of the bottom surface of the dewaxing kettle, and the discharge port is connected to the collection box via a discharge pipe; both the left and right horizontal plates of the placement rack are provided with strip-shaped sliding openings, and synchronous motors are provided at both ends of the rear surface of the dewaxing kettle, the output end of the synchronous motor is connected to a screw, and the screw is located at the upper end inside the dewaxing kettle; a pusher ring is provided inside the dewaxing kettle, the pusher ring is spirally sleeved on the screw, and the pusher ring passes through the strip-shaped sliding opening.

[0005] Furthermore, the lower surface of the pusher ring is provided with an arc-shaped scraper for scraping the bottom surface of the dewaxing kettle.

[0006] Furthermore, the bottom surface of the collection box is inclined from front to back, a baffle is provided at the rear end of the upper surface of the collection box, a drive motor is provided on the upper surface of the baffle, the output end of the drive motor is connected to a stirring blade, and the stirring blade is provided inside the collection box, and a heating wire is provided inside the inner wall of the collection box.

[0007] The beneficial effects of this utility model are as follows: This utility model uses a synchronous motor to drive a screw to move a pusher ring along a strip-shaped sliding mouth, thereby automatically cleaning the residual wax in the dewaxing kettle. At the same time, the collection box, together with heating wires and stirring blades, maintains the fluidity of the wax liquid. This solves the problems of wax liquid solidification and accumulation and low efficiency of manual operation in traditional devices. It has the advantages of automated wax discharge, prevention of wax liquid solidification and accumulation, and improved dewaxing efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model.

[0009] Figure 2 This is the front view of the present invention. Detailed Implementation

[0010] The present invention will be further described below with reference to the accompanying drawings.

[0011] Please see Figure 1 and Figure 2 As shown, this utility model provides an embodiment: a valve mold shell dewaxing device, including a dewaxing kettle 1, a placement rack 2 for placing wax molds is provided inside the dewaxing kettle 1, a collection box 3 with an open upper surface is connected to the left side of the dewaxing kettle 1, a discharge port (not shown) is opened at the rear end of the bottom surface of the dewaxing kettle 1, the discharge port is connected to the collection box 3 via a discharge pipe 4; both the left and right horizontal plates of the placement rack 2 are provided with strip-shaped sliding mouths 21, both the left and right ends of the rear surface of the dewaxing kettle 1 are provided with synchronous motors (not shown), the output end of the synchronous motor is connected to a screw 22, and the screw 22 is located at the upper end inside the dewaxing kettle 1, a pusher ring 23 is provided inside the dewaxing kettle 1, the pusher ring 23 is spirally sleeved on the screw 22, and the pusher ring 23 passes through the strip-shaped sliding mouth 21.

[0012] The placement rack refers to the support structure used to place the wax model. Specifically, it can be implemented using a metal frame structure. Its function is to fix the position of the wax model during the dewaxing process and ensure uniform heating.

[0013] The collection box is a container connected to the side of the dewaxing kettle. It can be made of stainless steel. Its open surface is easy to observe and clean, and it is used to receive and temporarily store the liquid wax discharged during the dewaxing process.

[0014] The discharge port refers to the opening at the bottom of the dewaxing kettle, which can be achieved through a pipe connection. Its function is to discharge the dewaxing residue in a directional manner to avoid blockage.

[0015] The discharge pipe refers to the channel connecting the discharge port and the collection box. It can be implemented using a high-temperature resistant hose. Its function is to directly introduce the liquid wax into the collection box, reducing the risk of solidification during the process.

[0016] Among them, the strip-shaped sliding opening refers to the long strip-shaped opening set on the horizontal plate of the placement frame. It can be formed by mechanical processing. Its function is to provide a moving path for the pusher ring and ensure the stability of the pusher action.

[0017] Among them, the synchronous motor refers to the power device that drives the screw to rotate. Specifically, it can be implemented by a servo motor. Its function is to adjust the movement speed of the pusher ring by controlling the screw speed.

[0018] The screw refers to the threaded rod connected to the output end of the synchronous motor. It can be made of stainless steel and its function is to convert the rotary motion into the linear motion of the pusher ring.

[0019] Among them, the pusher ring refers to the ring-shaped component sleeved on the screw, which can be made of high-temperature resistant plastic material. Its function is to push the dewaxed residue towards the discharge port through the spiral motion.

[0020] The core innovation of this application lies in using a synchronous motor to drive a screw to move a pusher ring along a strip-shaped sliding opening, thereby using a spiral propulsion method to force the dewaxed residue to be discharged into the collection box, thus avoiding the solidification and blockage of wax in the pipes or bottom of the vessel, and reducing manual cleaning operations.

[0021] The working process and principle of this application are as follows: A placement rack is installed inside the dewaxing kettle to hold wax molds. Strip-shaped sliding openings are provided on the left and right horizontal plates of the placement rack. Synchronous motors are installed at both ends of the rear surface of the dewaxing kettle, and the output ends of the synchronous motors are connected to a screw, which is located at the upper end inside the dewaxing kettle. A pusher ring is installed inside the dewaxing kettle, spirally sleeved on the screw and passing through the strip-shaped sliding openings. A collection box with an open upper surface is connected to the left side of the dewaxing kettle, and a discharge port is provided at the rear end of the bottom surface inside the dewaxing kettle, which is connected to the collection box through a discharge pipe.

[0022] When dewaxing is required, place the wax model on the placement rack. Start the synchronous motor to drive the screw to rotate. The screw drives the pusher ring to move along the strip-shaped slide, pushing the wax model towards the rear end of the dewaxing tank. As the wax model melts due to heat, the molten wax flows into the collection box through the discharge port and outlet pipe. The continuous pushing of the pusher ring ensures continuous movement of the wax model, avoiding localized accumulation.

[0023] The screw and pusher ring design enables automatic wax mold feeding without manual operation. A strip-shaped sliding groove limits the pusher ring's movement trajectory, ensuring stability during the feeding process. The discharge port is located at the rear end of the bottom surface inside the dewaxing kettle, utilizing gravity to promote rapid wax discharge. The upper surface of the collection tank is open for easy observation and maintenance. The discharge pipe connects the dewaxing kettle and the collection tank, forming a closed wax delivery channel.

[0024] This design improves dewaxing efficiency and safety by replacing manual operation with mechanical automation. The screw drive mechanism enables continuous and stable feeding, accommodating wax molds of different sizes. Optimized discharge structure facilitates rapid wax removal, reducing the risk of pipe blockage.

[0025] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0026] The dewaxing autoclave is made of stainless steel and has an internal rack. The rack consists of two parallel horizontal plates with elongated sliding openings. A synchronous motor is mounted on each of the left and right ends of the rear surface of the autoclave, and the motor output shafts are connected to a screw via couplings. The screw has a double-threaded structure and is horizontally positioned in the upper part of the autoclave.

[0027] The pusher ring has a circular structure with an inner diameter that matches the outer diameter of the screw. It achieves helical motion through a threaded connection. The outer side of the pusher ring has a protruding part that passes through a strip-shaped slot on the horizontal plate of the mounting frame to push the wax mold.

[0028] A rectangular collection box is welded to the left side of the dewaxing reactor, with its upper surface open. A circular discharge port is located near the right side of the rear end of the bottom surface of the dewaxing reactor, and the discharge port is connected to the collection box via a curved discharge pipe. The discharge pipe is made of high-temperature resistant alloy material with smooth walls.

[0029] In use, place the wax model on the placement rack. Start the synchronous motor, which drives the screw to rotate. The screw drives the pusher ring to move to the right along the strip-shaped sliding mouth, pushing the wax model towards the rear end of the dewaxing kettle. As the wax model melts due to heat, the molten wax flows into the collection box through the discharge port and outlet pipe. The pusher ring continues to push, ensuring that the wax model is heated evenly and that the molten wax is discharged in a timely manner.

[0030] Through the above-described solution, this application achieves automated wax mold conveying and rapid wax discharge. The mechanical feeding system replaces manual operation, avoiding direct contact between operators and the high-temperature environment, thus improving operational safety. The optimized discharge structure promotes rapid wax flow, reducing the risk of pipe blockage. The increased automation significantly improves dewaxing efficiency and reduces the need for manual intervention. The overall design simplifies equipment maintenance and reduces operating costs.

[0031] Please continue reading. Figure 1 and Figure 2As shown, in one embodiment of the present invention, the lower surface of the pusher ring 23 is provided with an arc-shaped scraper 24 for scraping the inner bottom surface of the dewaxing kettle 1.

[0032] The arc-shaped scraper is made of flexible rubber, and its radius of curvature matches the curvature of the inner bottom surface of the dewaxing kettle. The scraper width covers 80%-90% of the pusher ring's moving path, and its thickness is controlled within the range of 3-5 mm. The scraper is fixed to the bottom of the pusher ring by bolts, and a buffer pad is installed at the connection. The scraper blade maintains a gap of 0.1-0.3 mm with the inner bottom surface of the dewaxing kettle, and when the pusher ring moves along the screw axis, the scraper blade forms line contact with the inner bottom surface of the dewaxing kettle.

[0033] Specifically, when the synchronous motor drives the screw to rotate, the pusher ring reciprocates along the strip-shaped sliding groove. The arc-shaped scraper at the bottom of the pusher ring continuously scrapes the bottom surface of the dewaxing vessel as it moves. Residual wax is pushed towards the discharge port by the scraper and enters the collection box through the discharge pipe. The gap between the scraper blade and the bottom surface ensures contact pressure while avoiding rigid friction damage to the vessel surface. The flexible scraper undergoes elastic deformation upon contact with solidified wax blocks, gradually peeling off the adhering substances through reciprocating motion. Buffer pads absorb vibration and impact during the pusher ring's movement, preventing loosening of the connection structure. This solution effectively removes residual wax from the bottom of the vessel after dewaxing, preventing it from solidifying and clogging the discharge channel after cooling.

[0034] As a preferred embodiment, the solution of this application is implemented as follows: an arc-shaped scraper is provided on the lower surface of the pusher ring. The arc-shaped scraper is made of wear-resistant metal material and fits against the inner bottom surface of the dewaxing kettle. The scraper has an arc-shaped design, and the curvature matches the curvature of the inner bottom surface of the dewaxing kettle. The scraper is fixed to the lower surface of the pusher ring with bolts and can be disassembled and replaced. During the movement of the pusher ring, the arc-shaped scraper can effectively scrape the inner bottom surface of the dewaxing kettle to remove residual wax.

[0035] Through the above technical solution, this application achieves effective cleaning of the bottom surface of the dewaxing kettle. The arc-shaped scraper moves with the pusher ring, continuously scraping the bottom surface of the dewaxing kettle to remove residual wax. This design prevents wax from solidifying and accumulating at the bottom of the kettle, avoids blockage of the discharge port, and ensures smooth discharge of wax. At the same time, it reduces the frequency of manual cleaning of the dewaxing kettle and improves equipment efficiency.

[0036] Please continue reading. Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the bottom surface of the collection box 3 is inclined from front to back, a baffle 31 is provided at the rear end of the upper surface of the collection box 3, a drive motor 32 is provided on the upper surface of the baffle 31, the output end of the drive motor 32 is connected to a stirring blade (not shown), and the stirring blade is provided inside the collection box 3. A heating wire (not shown) is provided inside the inner wall of the collection box 3.

[0037] The bottom surface of the collection box is tilted at an angle between 15° and 25° from front to back, with the lowest point of the tilted bottom surface corresponding to the discharge port. A baffle is vertically fixed to the upper rear edge of the collection box, with a height of 1 / 3 to 1 / 2 of the box's depth. The stirring blades adopt a double-layer spiral blade structure with a blade spacing of 50-80mm and a rotation speed adjustment range of 30-60rpm. Heating wires are embedded in the inner wall of the box in a serpentine arrangement, with a power density of 2.5-3.5W / cm³. 2 The operating temperature is maintained at 65-75℃.

[0038] Specifically, after dewaxing, the liquid wax enters the collection tank through the discharge pipe. The inclined bottom surface allows the wax to flow automatically towards the rear under gravity. Heating wires continuously heat the inner wall of the tank, keeping the wax in a molten state. When the drive motor rotates the stirring blades, the spiral blades push the wax backward from the front, preventing localized cooling during flow. Baffles prevent splashing from the high-speed rotating stirring blades, and the combined effect of the inclined bottom surface and the stirring motion creates a directional flow of the wax. When the wax reaches the rear of the tank, its temperature is still above its freezing point, allowing it to be directly discharged through the bottom valve for recycling. This structure, through the combination of temperature maintenance and mechanical stirring, effectively prevents secondary solidification of the wax during the collection stage.

[0039] As a preferred embodiment, the solution of this application is specifically implemented as follows:

[0040] The bottom surface of the collection box slopes from front to back. A baffle is installed at the rear end of the upper surface of the collection box. A drive motor is installed on the upper surface of the baffle. The output end of the drive motor is connected to a stirring blade. The stirring blade is located inside the collection box. Heating wires are installed inside the inner wall of the collection box.

[0041] Specifically, the inclination angle of the bottom surface of the collection box can be 15°. The baffle height is 1 / 3 of the collection box height. The drive motor is a servo motor with a rated power of 1kW. The stirring blades are made of stainless steel and include one main shaft and four blades. The length of the main shaft is approximately equal to the internal width of the collection box, and the blade length is 1 / 2 of the main shaft length. The heating wire is made of nickel-chromium alloy with a power density of 5W / cm³. 2 They are evenly distributed on the inner walls around the collection box.

[0042] Through the above technical solution, this application can effectively prevent the wax from solidifying and clogging in the collection tank. The inclined bottom surface facilitates the flow of the wax. The stirring blades continuously stir the wax, maintaining its fluidity. The heating wire heats the collection tank to maintain the temperature of the wax. These measures work together to ensure smooth flow of the wax and avoid solidification and clogging problems. At the same time, the stirring process helps to evenly mix the wax, facilitating subsequent recycling.

[0043] In this invention, the synchronous motor, drive motor, and heating wire are all existing technologies, which are already clearly understood by those skilled in the art, and will not be described in detail here.

[0044] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. A valve mold shell dewaxing device, comprising a dewaxing kettle, characterized in that: The dewaxing kettle is equipped with a rack for placing wax molds. A collection box with an open upper surface is connected to the left side of the dewaxing kettle. A discharge port is opened at the rear end of the bottom surface of the dewaxing kettle, and the discharge port is connected to the collection box via a discharge pipe. A strip-shaped sliding opening is opened on both the left and right horizontal plates of the rack. A synchronous motor is installed at both ends of the rear surface of the dewaxing kettle. The output end of the synchronous motor is connected to a screw, and the screw is located at the upper end of the dewaxing kettle. A pusher ring is installed inside the dewaxing kettle. The pusher ring is spirally sleeved on the screw and passes through the strip-shaped sliding opening.

2. The valve mold shell dewaxing device according to claim 1, characterized in that: The lower surface of the pusher ring is provided with an arc-shaped scraper for scraping the bottom surface of the dewaxing kettle.

3. The valve mold shell dewaxing device according to claim 1, characterized in that: The bottom surface of the collection box is inclined from front to back. A baffle is provided at the rear end of the upper surface of the collection box. A drive motor is provided on the upper surface of the baffle. The output end of the drive motor is connected to a stirring blade, which is located inside the collection box. A heating wire is provided inside the inner wall of the collection box.

Images