Die casting device for boiler accessory production

By linking the cylinder-driven slide bar with the forming module, the automated demolding of the die-casting device for boiler parts production is realized, which solves the problem of unstable demolding caused by insufficient electromagnet adsorption force, and improves production efficiency and casting quality.

CN223642754UActive Publication Date: 2025-12-09JINAN JULONG BOILER CO LTD +1
View PDF 1 Cites 0 Cited by

Patent Information

Application Number
CN202522355704.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-06
Publication Date
2025-12-09
Estimated Expiration
2035-11-06

AI Technical Summary

Technical Problem

In existing die-casting equipment used for boiler parts production, insufficient electromagnet attraction during the demolding process can easily lead to castings falling off, or excessive attraction can cause deformation. Furthermore, the molds are prone to wear, and the demolding mechanism lacks reliability.

Method used

The cylinder-driven slide bar and molding module are linked, and the vertical sliding cooperation between the slide rail and the slide bar achieves automated demolding. Combined with the fastening effect of the limiting groove and the stop block, it ensures tight mold closing and accurate demolding, avoiding manual intervention.

Benefits of technology

It has enabled automated demolding of boiler parts, significantly improving production efficiency, reducing manpower input, reducing equipment control complexity, and ensuring casting quality and mold stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223642754U_ABST
    Figure CN223642754U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of die-casting devices, and discloses a die-casting device for boiler accessory production, the inner wall of the left side of a sliding seat is slidably connected with a die holder II, the upper end and the lower end of one side, close to a side plate, of the die holder II are vertically provided with sliding rails respectively, and the inner walls of the two sets of sliding rails are vertically and slidably connected with sliding rods; and a second air cylinder is vertically installed on the outer wall of the left side plate, the output end of the second air cylinder is fixedly connected with an abutting block and extends to the front end of the sliding rod, a forming module is vertically and fixedly inserted into a rod body at the bottom of the sliding rod, and limiting grooves matched with the forming module are formed in the second mold base and the second forming mold correspondingly. Through the arrangement of the second air cylinder, the sliding rod and the forming module, the second air cylinder drives the abutting block, the sliding rod and the forming module to be linked, the demolding action automation is achieved, the overall production efficiency is remarkably improved, the demolding action and the reset process of the second mold base are synchronously linked, and when the second air cylinder pulls the abutting block to reset, the forming module synchronously retreats from the limiting groove to complete demolding. The operation process is simplified.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model relates to the field of die-casting equipment technology, specifically a die-casting equipment for boiler parts production. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler includes the chemical energy of fuel and electrical energy. The boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. The hot water or steam produced in the boiler can directly provide the heat energy needed for industrial production and people's lives, or it can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator.

[0003] Application number CN202120666415.8 discloses a die-casting device for boiler parts production, including a base plate. Two side plates are fixedly installed on the top of the base plate, and an upper plate is fixedly installed on the base plate through the two side plates. A second motor is fixedly installed on the left side of one of the side plates. A first lead screw is movably installed between the two side plates. The output end of the second motor is fixedly connected to one end of the first lead screw. A first slider is threaded onto the outer surface of the first lead screw. A cylinder is fixedly installed at the bottom of the first slider. An upper mold is fixedly installed at the output end of the cylinder. A second mounting groove is opened at the bottom of the upper mold, and an electromagnet is embedded in the upper mold through the second mounting groove. A fixed platform is fixedly installed on the top of the base plate. This utility model, through a series of structural features, enables the device to easily change the lower mold and automatically remove the die-cast parts.

[0004] The application achieves demolding through "electromagnetic attraction + cylinder-driven upper mold lifting". The core relies on the electromagnet's attraction force on the die-casting parts. However, boiler parts are mostly made of metal. After die-casting, the castings are prone to sticking to the inner wall of the mold due to high temperature. If the electromagnet's attraction force is insufficient, the castings are prone to falling off and being damaged. If the attraction force is too strong, the castings may be pulled and deformed during demolding. In fact, the mold may be worn due to the deviation of the attraction position scraping the inner wall of the upper mold. Utility Model Content

[0005] The purpose of this utility model is to provide a die-casting device for the production of boiler parts, which solves the problem of insufficient reliability of the demolding mechanism.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to a die-casting device for boiler parts production, comprising a die-casting mold assembly and a demolding assembly. The demolding assembly is installed on the left side of the die-casting mold assembly and extends to the inner wall. The die-casting mold assembly includes a base, with side plates vertically arranged on both sides of the upper surface of the base. A slide seat is provided on the top of the base. A mold base two is slidably connected to the inner wall of the left side of the slide seat. A forming mold two is provided on the right side of the mold base two. Slide rails are vertically arranged at the upper and lower ends of the side of the mold base two near the side plate. Slide rods are vertically slidably connected to the inner walls of the two sets of slide rails. A cylinder two is vertically installed on the outer wall of the left side plate. A stop block is fixedly connected to the output end of the cylinder two and extends to the front end of the slide rod. A forming module is vertically fixedly inserted into the bottom of the slide rod. The mold base two and the forming mold two are respectively provided with limiting grooves adapted to the forming module.

[0008] The purpose of this setup is that, during the use of the device, in the die-casting mold assembly, the base provides support for the whole, the two side plates are vertically fixed to the upper surface of the base to form a stable frame, the slide is installed on the top of the base, and the mold base two is slidably connected to the inner wall of its left side. The forming mold two on the right side of the mold base two is used for casting. The upper and lower ends of the mold base two near the side plate are vertically provided with slide rails, and the slide rod is vertically slidably connected to the inner wall of the slide rail, which can be stably raised and lowered along the slide rail.

[0009] When the cylinder two on the outer wall of the left side plate is started, the output end pushes the stop block, the stop block abuts against the mold base two, forcing the mold base two to move along the slide block to the right mold base one and close tightly, thus achieving mold fastening. At the same time, the forming module at the bottom of the slide rod is precisely embedded through the limiting groove on the mold base two and the forming mold two, forming a closed cavity with the forming mold two.

[0010] After die casting is completed, cylinder two pulls the abutment to reset, mold base two separates from mold base one, slide rod rises along slide rail, molding module exits from limit groove, pushes casting to complete demolding. Throughout the process, the cooperation of slide rail and slide rod ensures stable movement, the fastening effect of abutment ensures tight mold closing, and limit groove ensures molding accuracy, achieving efficient connection between die casting and demolding.

[0011] The vertical sliding cooperation between the slide rail and the slide rod provides stable guidance for the demolding movement of the molding module. Relying on the linkage of the cylinder two driving the stop block, the slide rod and the molding module, the demolding action is automated, eliminating the need for manual peeling of the casting, greatly shortening the demolding time, reducing manpower input, adapting to the mass production needs of boiler parts, and significantly improving the overall production efficiency. The demolding action and the mold base two reset process are synchronized. When the cylinder two pulls the stop block to reset, the molding module simultaneously exits the limit groove to complete the demolding, simplifying the operation process, reducing the complexity of equipment control, and improving the stability of the demolding process.

[0012] Furthermore, a mold base is horizontally slidably connected to the inner right side wall of the slide block, a flow liquid pipe is vertically connected to the outer right side wall of the mold base, and a cylinder is vertically installed on the outer wall of the right side plate.

[0013] The purpose of this setup is that, during the use of the device, the inner wall of the right side of the slide is horizontally connected to the mold base one, which can move laterally along the slide. The outer wall of the right side is vertically connected to the flow liquid pipe for conveying the die casting raw material. After the cylinder one on the outer wall of the right side plate is started, the output end pushes the mold base one to slide to the left, cooperating with the mold base two to achieve mold closing. The flow liquid pipe moves synchronously with the mold base one to ensure that the raw material conveying channel is precisely connected to the mold cavity, providing a basis for the filling of raw material.

[0014] Furthermore, a push block is fixedly installed at the output end of the cylinder, and a liquid inlet is vertically provided near the top of the liquid flow pipe close to the push block. The push block is slidably connected to the inner wall of the liquid flow pipe.

[0015] The purpose of this setup is that, during the use of the device, the push block at the output end of cylinder one is slidably connected to the inner wall of the flow liquid pipe. After the die-casting raw material is injected into the flow liquid pipe through the inlet hopper, cylinder one drives the push block to move forward, using the squeezing action to press the raw material into the molding cavity. The vertical setting of the inlet hopper facilitates continuous feeding, and the sliding of the push block ensures stable raw material conveying pressure, avoiding insufficient filling of the cavity.

[0016] Furthermore, a forming mold is provided on the right side of the mold base, and forming grooves 1 and 2 are respectively provided on the adjacent sides of the forming mold 1 and the forming mold 2.

[0017] The purpose of this arrangement is that, during the use of the device, the forming mold 1 on the right side of mold base 1 and the forming mold 2 on the right side of mold base 2 are set accordingly. When the mold is closed, the two move towards each other and fit together under the drive of the cylinder. The forming groove 1 and forming groove 2 on the adjacent surfaces combine to form a complete casting cavity. After the raw material is injected, it is cooled and formed under the constraint of the cavity, ensuring that the shape of the casting is consistent with the design, laying the foundation for subsequent demolding.

[0018] Furthermore, the bottom surface of the molding mold second near the molding groove second of the molding module is provided with a flow hole groove, and the molding groove second circulates with the cavity between the molding mold second and the limiting groove through the flow hole groove.

[0019] The purpose of this design is that, during the use of the device, the bottom surface of the forming groove of the second forming mold has a flow hole groove, which connects the second forming groove with the cavity between the second forming mold and the limiting groove. During die casting, some raw material enters the connected cavity through the flow hole groove and comes into contact with the forming module. During demolding, the forming module moves and pushes the casting through the raw material connection part at the hole groove, so that the casting separates from the second forming groove, thereby improving the reliability of demolding.

[0020] Furthermore, the cavities of the liquid inlet hopper, the liquid flow pipe, the first forming tank, and the second forming tank are interconnected.

[0021] The purpose of this design is that, during the operation of the device, the raw material received by the inlet hopper flows into the flow pipe, is squeezed by the pusher block, and then sequentially passes through the flow pipe and forming tank one into forming tank two, thus achieving interconnection between the cavities. This flow design ensures that the raw material evenly fills the entire cavity, avoiding defects such as porosity and cracks in the casting due to localized material shortages, and guaranteeing product quality.

[0022] This utility model has the following beneficial effects:

[0023] (1) This utility model uses cylinder two, slide bar and forming module to drive the block, slide bar and forming module to work together to realize the demolding action is automated. There is no need to manually peel off the casting, which significantly improves the overall production efficiency. The demolding action is connected synchronously with the mold base two reset process. When cylinder two pulls the block to reset, the forming module exits the limit groove at the same time to complete the demolding, which simplifies the operation process.

[0024] (2) In this utility model, the liquid inlet hopper, the liquid flow pipe and the cylinder are set up. The push block at the output end of the cylinder is slidably connected to the inner wall of the liquid flow pipe. After the die casting raw material is injected into the liquid flow pipe through the liquid inlet hopper, the cylinder drives the push block to move forward and uses the squeezing action to press the raw material into the molding cavity. The vertical setting of the liquid inlet hopper facilitates continuous feeding. The sliding of the push block ensures that the raw material conveying pressure is stable and avoids insufficient filling of the cavity.

[0025] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of the front cross-section of the die-casting mold assembly of this utility model;

[0029] Figure 3 This is a schematic diagram of the internal structure of the die-casting mold assembly of this utility model in cross-section;

[0030] Figure 4 This is a cross-sectional view of the present invention and a partial cross-sectional view of the demolding component structure;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] In the diagram: 1. Die-casting mold assembly; 101. Base; 102. Side plate; 103. Flow pipe; 104. Inlet hopper; 105. Cylinder 1; 106. Push block; 107. Mold base 1; 108. Molding mold 1; 109. Molding groove 1; 110. Mold base 2; 111. Molding mold 2; 112. Flow hole groove; 113. Molding groove 2; 114. Slide seat; 2. Demolding assembly; 201. Molding module; 202. Abutment block; 203. Slide rail; 204. Slide rod; 205. Limiting groove; 206. Cylinder 2. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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] Please see Figures 1-4 As shown, this utility model is a die-casting device for boiler parts production, including a die-casting mold assembly 1 and a demolding assembly 2. The demolding assembly 2 is installed on the left side of the die-casting mold assembly 1 and extends to the inner wall. The die-casting mold assembly 1 includes a base 101, with side plates 102 vertically arranged on both sides of the upper surface of the base 101. A slide 114 is provided on the top of the base 101. A mold base 2 110 is slidably connected to the inner wall of the left side of the slide 114. A forming mold 2 111 is provided on the right side of the mold base 2 110. The upper and lower ends of one side of the near side plate 102 are respectively provided with slide rails 203. The inner walls of the two sets of slide rails 203 are vertically connected to slide rods 204. The outer wall of the left side plate 102 is vertically installed with cylinder 206. The output end of cylinder 206 is fixedly connected to a stop block 202 and extends to the front end of slide rod 204. The bottom rod of slide rod 204 is vertically fixedly inserted with molding module 201. Mold base 210 and molding die 211 are respectively provided with limiting grooves 205 that are adapted to molding module 201.

[0035] The purpose of this arrangement is that, during the use of the device, in the die-casting mold assembly 1, the base 101 provides support for the whole, the two side plates 102 are vertically fixed to the upper surface of the base 101 to form a stable frame, the slide block 114 is installed on the top of the base 101, and the mold base 2 110 is slidably connected to the inner wall of its left side. The forming mold 2 111 on the right side of the mold base 2 110 is used for casting. The upper and lower ends of the mold base 2 110 near the side plate 102 are vertically provided with slide rails 203, and the slide rod 204 is vertically slidably connected to the inner wall of the slide rail 203, and can be stably raised and lowered along the slide rail.

[0036] When the cylinder 206 on the outer wall of the left side plate 102 is started, the output end pushes the stop block 202, the stop block 202 abuts against the mold base 110, forcing the mold base 110 to move along the slide 114 to the right mold base 107 and close tightly, thus achieving mold fastening. At the same time, the forming module 201 at the bottom of the slide rod 204 is precisely embedded through the limiting groove 205 on the mold base 110 and the forming mold 111, forming a closed cavity with the forming mold 111.

[0037] After die casting is completed, cylinder 206 pulls the stop block 202 to reset, mold base 210 separates from mold base 107, slide rod 204 rises along slide rail 203, forming module 201 exits from limiting groove 205, and pushes the casting to complete demolding. Throughout the process, the cooperation between slide rail and slide rod ensures stable movement, the fastening effect of stop block ensures tight mold closing, and limiting groove ensures forming accuracy, thus achieving efficient connection between die casting and demolding.

[0038] The vertical sliding cooperation between the slide rail 203 and the slide rod 204 provides stable guidance for the demolding movement of the molding module 201. Relying on the linkage of the cylinder 206 driving the stop block 202, the slide rod 204 and the molding module 201, the demolding action is automated, eliminating the need for manual peeling of the casting, greatly shortening the demolding time, reducing manpower input, adapting to the mass production needs of boiler parts, and significantly improving the overall production efficiency. The demolding action is synchronously connected with the reset process of the mold base 210. When the cylinder 206 pulls the stop block 202 to reset, the molding module 201 simultaneously exits the limit groove 205 to complete the demolding, simplifying the operation process, reducing the complexity of equipment control, and improving the stability of the demolding process.

[0039] A mold base 107 is horizontally slidably connected to the inner right side wall of the slide block 114. A flow liquid pipe 103 is vertically connected to the outer right side wall of the mold base 107. A cylinder 105 is vertically installed on the outer wall of the right side plate 102.

[0040] The purpose of this arrangement is that, during the use of the device, the inner wall of the right side of the slide 114 is horizontally connected to the mold base 107, which can move laterally along the slide. The outer wall of the right side is vertically connected to the flow pipe 103 for conveying die-casting raw materials. After the cylinder 105 on the outer wall of the right side plate 102 is started, the output end pushes the mold base 107 to slide to the left, cooperating with the mold base 110 to achieve mold closing. The flow pipe 103 moves synchronously with the mold base 107 to ensure that the raw material conveying channel is precisely connected to the mold cavity, providing a basis for raw material filling.

[0041] A push block 106 is fixedly installed at the output end of cylinder 105. A liquid inlet 104 is vertically provided on the liquid flow pipe 103 near the top of the push block 106. The push block 106 is slidably connected to the inner wall of the liquid flow pipe 103.

[0042] The purpose of this arrangement is that, during the use of the device, the push block 106 at the output end of cylinder 105 is slidably connected to the inner wall of the flow liquid pipe 103. After the die-casting raw material is injected into the flow liquid pipe 103 through the inlet hopper 104, cylinder 105 drives the push block 106 to move forward, using the squeezing action to press the raw material into the molding cavity. The vertical setting of the inlet hopper 104 facilitates continuous feeding, and the sliding of the push block 106 ensures stable raw material conveying pressure and avoids insufficient filling of the cavity.

[0043] A forming mold 108 is provided on the right side of the mold base 107. A forming groove 109 and a forming groove 113 are respectively provided on the adjacent side of the forming mold 108 and the forming mold 2 111.

[0044] The purpose of this arrangement is that, during the use of the device, the forming mold 108 on the right side of mold base 107 and the forming mold 111 on the right side of mold base 110 are set in correspondence. When the mold is closed, the two move towards each other and fit together under the drive of the cylinder. The forming groove 109 and forming groove 113 on the adjacent surfaces combine to form a complete casting cavity. After the raw material is injected, it is cooled and formed under the constraint of the cavity, ensuring that the shape of the casting is consistent with the design, laying the foundation for subsequent demolding.

[0045] The bottom surface of the molding mold 2 111 near the molding groove 2 113 of the molding module 201 has a flow hole groove 112. The molding groove 2 113 flows through the flow hole groove 112 into the cavity between the molding mold 2 111 and the limiting groove 205.

[0046] The purpose of this design is that, during the use of the device, the bottom surface of the forming groove 113 of the forming mold 2 111 has a flow hole groove 112, which connects the forming groove 113 with the cavity between the forming mold 2 111 and the limiting groove 205. During die casting, some raw materials enter the connected cavity through the flow hole groove 112 and come into contact with the forming module 201. During demolding, the forming module 201 moves and pushes the casting through the raw material connection part at the hole groove, so that the casting separates from the forming groove 113, thereby improving the reliability of demolding.

[0047] The liquid inlet hopper 104, the liquid flow pipe 103, the first forming tank 109 and the second forming tank 113 are interconnected.

[0048] The purpose of this design is that, during the use of the device, the raw material received by the inlet hopper 104 flows into the flow pipe 103, is squeezed by the pusher block 106, and then sequentially passes through the flow pipe 103 and the first forming tank 109 into the second forming tank 113, thus achieving interconnection between the cavities. This flow design ensures that the raw material evenly fills the entire cavity, avoiding defects such as porosity and cracks in the casting due to local material shortages, and guaranteeing product quality.

[0049] When in use, after the device is started, the die casting raw material is first injected into the flow pipe 103 through the liquid inlet 104. The right cylinder 105 is started, pushing the push block 106 to slide in the flow pipe 103. At the same time, the mold base 107 moves to the left along the slide 114. The left cylinder 206 is started simultaneously, pushing the stop block 202 to abut against the mold base 210, causing the mold base 210 to move to the right. Finally, the mold base 107 and the mold base 210 are tightly joined together, the forming mold 108 and the forming mold 211 are attached, and the forming groove 109 and the forming groove 213 are combined to form a closed cavity.

[0050] The pressing block 106 continuously squeezes the raw material, which enters the forming tank 109 through the flow liquid pipe 103, then flows into the forming tank 213, and enters the cavity between the forming mold 211 and the limiting groove 205 through the flow hole groove 112, completing the full filling of the cavity. After the raw material cools and is formed, the cylinder 105 drives the mold base 107 to reset to the right, and the forming mold 108 separates from the forming mold 211.

[0051] Subsequently, cylinder 206 pulls block 202 to reset, mold base 110 moves to the left, and slide rod 204 rises along slide rail 203. Forming module 201 exits from limit groove 205 and pushes the casting through the connecting part at flow hole groove 112, so that the casting is separated from forming groove 113, completing demolding. Finally, the casting is removed manually or mechanically, all components of the device are reset, and the next die casting cycle begins. The entire process is automated by cylinder drive for mold closing, filling, and demolding. All components work together to ensure casting quality and production efficiency.

[0052] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A die-casting apparatus for producing boiler accessories, comprising a die-casting mold assembly (1) and a demolding assembly (2), characterized in that: The demolding assembly (2) is installed on the left side of the die-casting mold assembly (1) and extends to the inner wall. The die-casting mold assembly (1) includes a base (101). Side plates (102) are vertically provided on both sides of the upper surface of the base (101). A slide (114) is provided on the top of the base (101). A mold base two (110) is slidably connected to the inner wall of the left side of the slide (114). A forming mold two (111) is provided on the right side of the mold base two (110). The upper and lower ends of the side of the mold base two (110) near the side plate (102) are vertically connected to the mold base two (110). A slide rail (203) is provided, and a slide rod (204) is vertically slidably connected to the inner wall of the two sets of slide rails (203). A cylinder (206) is vertically installed on the outer wall of the left side plate (102). A stop block (202) is fixedly connected to the output end of the cylinder (206) and extends to the front end of the slide rod (204). A molding module (201) is vertically fixedly inserted into the bottom rod of the slide rod (204). The mold base (110) and the molding mold (111) are respectively provided with limiting grooves (205) that are adapted to the molding module (201).

2. The die-casting apparatus for boiler component production according to claim 1, characterized in that: A mold base (107) is horizontally slidably connected to the inner right side of the slide (114), a flow liquid pipe (103) is vertically connected to the outer right side of the mold base (107), and a cylinder (105) is vertically installed on the outer right side plate (102).

3. The die-casting apparatus for boiler parts production according to claim 2, characterized in that: A push block (106) is fixedly installed at the output end of the cylinder (105). A liquid inlet (104) is vertically provided near the top of the push block (106) in the flow pipe (103). The push block (106) is slidably connected to the inner wall of the flow pipe (103).

4. The die-casting apparatus for boiler parts production according to claim 3, characterized in that: The right side of the mold base (107) is provided with a molding mold (108), and the adjacent sides of the molding mold (108) and the molding mold (111) are respectively provided with a molding groove (109) and a molding groove (113).

5. A die-casting apparatus for producing boiler accessories according to claim 4, characterized in that: The bottom surface of the molding mold (111) near the molding groove (113) of the molding module (201) is provided with a flow hole groove (112). The molding groove (113) flows through the flow hole groove (112) into the cavity between the molding mold (111) and the limiting groove (205).

6. A die-casting apparatus for producing boiler accessories according to claim 5, characterized in that: The liquid inlet hopper (104), the liquid flow pipe (103), the first forming tank (109) and the second forming tank (113) are interconnected.

Citation Information

Patent Citations

  • Die casting device for boiler accessory production

    CN214977655U