Efficient curing device for sand core of cold core box

Abstract

In order to reduce the influence of the environment temperature on the catalytic action and improve the core making efficiency, the utility model provides the efficient solidification device for the sand core of the cold core box, which comprises an air blowing plate, a high-temperature compressed air inlet and a catalyst inlet which are communicated with a mixing cavity are formed in one end of the air blowing plate, and an air outlet is formed in the other end of the air blowing plate; the ejector core rod mechanism comprises an ejector core rod, a fixed block fixedly connected above the blowing plate and an end cover fixedly connected above the fixed block, a spring mounting hole is formed in the fixed block, a reset spring is arranged in the spring mounting hole, and the ejector core rod sequentially penetrates through the end cover, the reset spring and the lower end of the fixed block from top to bottom and then extends into the sand shooting hole of the upper core box; a communicating cavity is formed between the upper core box and the blowing plate, and the communicating cavity is communicated with the mixing cavity and the upper core box sand shooting hole; and the upper core ejecting limiting column is fixedly connected to the upper portion of the blowing plate, a catalyst enters the core box cavity after being preheated to be subjected to a catalytic reaction with a binding agent, the curing time is shortened, and the core making efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a cold core box sand core efficient curing device. Background Art

[0002] The engine cylinder heads produced by our company adopt the high-efficiency catalyst cold core box core making process, and the automated robot core removal, core repair and core assembly. Due to the complex structure of the sand core and the long blowing time, the sand core is prone to deformation during the production process. In the actual core making process, the core making efficiency is affected by the ambient temperature, especially in winter when the workshop ambient temperature is low, the catalyst activity is reduced, the blowing curing time is long, the efficiency is low, and the sand core size accuracy is poor, which seriously restricts the improvement of core making efficiency and the stability of product quality. In order to improve the core making efficiency, the catalyst and compressed air are often preheated at the catalyst outlet, but due to safety factors, the preheating temperature generally does not exceed 120℃. When it reaches the core box after a long distance of transportation, coupled with the influence of core sand temperature, core box temperature and other aspects, the heat loss is large and the efficiency improvement is not obvious. Utility Model Content

[0003] In order to reduce the influence of ambient temperature on catalysis and improve core making efficiency, the utility model provides a cold core box sand core high-efficiency curing device, and the technical scheme adopted is as follows:

[0004] A cold box sand core efficient curing device, characterized by comprising:

[0005] A blowing plate, wherein a mixing chamber is arranged inside the blowing plate, and a high-temperature compressed air inlet and a catalyst inlet which are connected to the mixing chamber are arranged at one end of the blowing plate;

[0006] The core push rod mechanism is composed of a core push rod, a fixed block, and an end cover. The fixed block is fixedly connected to the top of the blowing plate, and the end cover is fixedly connected to the top of the fixed block. The fixed block is provided with spring mounting holes distributed in a vertical direction, and a reset spring is provided in the spring mounting hole. The core push rod passes through the end cover, the reset spring, and the lower end of the fixed block from top to bottom in sequence and then extends into the sand shooting hole of the upper core box.

[0007] An upper core box, a connecting cavity is provided between the upper core box and the blowing plate, and the connecting cavity is connected with the mixing cavity and the sand shooting hole of the upper core box;

[0008] The upper top core limiting column is fixedly connected above the blowing plate and is used for cooperating with the top core plate of the core making machine for limiting.

[0009] Furthermore, sealing rings are provided between the end cover and the top core rod, and between the end cover and the fixing block.

[0010] Furthermore, a positioning pin for cooperating and positioning with the upper core box is fixedly connected below the blowing plate.

[0011] Furthermore, a sealing strip is provided on the outer side between the blowing plate and the upper core box.

[0012] Furthermore, the core push rod is composed of a fixed rod and a connecting rod, and the connecting rod is threadedly connected below the fixed rod and is located in the sand shooting hole of the upper core box.

[0013] The beneficial effects of the utility model are:

[0014] 1. The core rod is connected to the blowing plate by sliding up and down through the fixed block, end cover and return spring. The core rod is arranged independently, and the height can be adjusted at a single point according to the quality of the sand core. A sealing mechanism is provided between the fixed block, end cover and core rod, which can eliminate the use of a large-volume blowing sealing cover and save the amount of catalyst.

[0015] 2. The blowing plate is provided with a catalyst air inlet and a high-temperature compressed air inlet. The core box can be preheated in advance with the help of high-temperature compressed air before core making. During core making, the catalyst first enters the cavity of the blowing plate through the air inlet, and then the high-temperature compressed air is blown in through another air inlet. The two are mixed in the blowing plate to preheat the catalyst, further enhance the catalyst activity, and improve the core making efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model

[0017] Figure 2 Schematic diagram of the connection structure between the core push rod mechanism, the blowing plate and the upper core box

[0018] Figure 3 Top view of the blowing plate

[0019] Figure 4 Bottom view of the blowing plate

[0020] Among them, 1-core making machine top core plate, 2-blowing plate, 3-core push rod mechanism, 4-upper core limit column, 5-positioning pin, 6-positioning key, 7-core push rod, 701-fixing rod, 702-connecting rod, 8-fixing block, 9-end cover, 10-reset spring, 11-first sealing ring, 12-second sealing ring, 13-mixing chamber, 14-catalyst air inlet, 15-high-temperature compressed air inlet, 16-upper core box, 17-sand shooting hole, 18-core box cavity, 19-connecting cavity, 20-sealing strip, 21-catalyst generator, 22-compressed air heating device, 23-switch valve. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0022] In the description of the utility model, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the viewing direction or position relationship, and are only for the convenience of describing the utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] like Figures 1 to 4 The cold core box sand core efficient curing device shown comprises a blowing plate 2, a core pushing rod mechanism 3, and an upper core box 16. An upper core pushing rod mechanism 3 and an upper core pushing limit column 4 are arranged at the upper end of the blowing plate 2.

[0024] Specifically, a mixing chamber 13 is provided inside the blowing plate 2, and a group of catalyst air inlets 14 and a group of high-temperature compressed air inlets 15 are provided at one end of the outer side. The catalyst air inlet 14 is connected to the catalyst generator 21. The catalyst generator 21 is an amine generator in this embodiment. The air outlet of the compressed air heating device 22 is connected to the high-temperature compressed air inlet 15. The catalyst air inlet 14 and the catalyst generator 21, and the compressed air heating device 22 and the high-temperature compressed air inlet 15 are connected by pipelines, and a switch valve 23 is provided on the official channel. A positioning pin 5 is provided under the blowing plate 2 for cooperating with the upper core box 16 for positioning. A positioning key 6 is also fixedly connected to the outer side of the upper end for cooperating with the core making machine for positioning.

[0025] The core rod mechanism 3 includes a core rod 7, a fixed block 8, and an end cover 9. The core rod 7 consists of a fixed rod 701 and a connecting rod 702 threadedly connected to the bottom of the fixed rod 701. The blowing plate 2 is provided with through holes extending through the upper and lower parts. The lower end of the fixed block 8 is fixedly connected to the through holes. A spring mounting hole is provided inside the fixed block 8, and a return spring 10 is provided in the spring mounting hole. The end cover 9 is fixedly connected to the top of the fixed block 8. The upper and lower ends of the return spring 10 are respectively connected to the lower end surface of the end cover 9 and the bottom end of the spring mounting hole. The fixed rod 701 passes through the end cover 9, the return spring 10 and the lower end of the fixed block 8 from top to bottom in sequence. The connecting rod 702 is located in the sand shooting hole 17. The connecting rod 702 can be disassembled at any time or the matching size can be adjusted at any time according to the flatness of the sand core surface. In addition, a first sealing ring 11 is provided between the lower end surface of the end cover 9 and the upper end surface of the fixed block 8, and a second sealing ring 12 is provided between the end cover 9 and the fixed rod 701.

[0026] A connecting cavity 19 is provided between the upper core box 16 and the blowing plate 2 , and the connecting cavity 19 is used to connect the mixing cavity 13 and the sand-shooting hole 17 . A sealing strip 20 is provided on the outer side between the blowing plate 2 and the upper core box 16 .

[0027] The method for high-efficiency curing process using this device is as follows:

[0028] Step 1: The compressed air heated before core making enters the mixing chamber 13 of the blowing plate 2 through the catalyst air inlet 14, and enters the core box cavity 18 through the connecting cavity 19 and the sand-shooting hole 17 to preheat the upper core box 16;

[0029] Step 2: After the preheating is completed, the core making operation is carried out. The blowing plate 2 moves to the blowing station and cooperates with the upper core box 16 by means of the positioning pin 5.

[0030] Step 3: The core making machine drives the core making machine top core plate 1 to descend, and the core pushing rod mechanism 3 is compressed and moves downward until the core making machine top core plate 1 contacts and stops with the upper core pushing limit column 4, and the core pushing rod 7 flattens the residual core sand at the sand shooting nozzle;

[0031] Step 4: The catalyst enters the mixing chamber 13 through the catalyst air inlet 14. After the catalyst is blown according to the set time and flow rate, the switch valve 23 on the air path is closed. Then, hot air enters the mixing chamber 13 through the high-temperature compressed air inlet 15 to mix with the catalyst and drive the catalyst into the core box cavity 18, which lasts for 10-20 seconds.

[0032] Step 5: After curing is completed, the upper core box 16 rises and separates from the lower core box, and the sand core is ejected from the upper core box 16 by the relative force of the core plate 1 of the core making machine, and the lower core box is moved out of the core making machine;

[0033] Step 6: The robot fixture removes the sand core and the core making cycle ends.

[0034] When the device is working, the core-pushing mechanism of the core-making machine descends, driving the core-pushing plate 1 of the core-making machine to contact with the top surface of the core-pushing rod 7 to generate pressure, so that the core-pushing rod 7 compresses the reset spring 10 and moves downward to flatten the sand core, and then opens the switch valve 23 to blow the catalyst and high-temperature compressed gas into the mixing chamber, and finally enters the core box cavity 18, catalyzing the binder to react and solidify to form a sand core, and after the core box is opened after the curing is completed, the core-pushing mechanism of the core-making machine is separated from the core-pushing rod 7, and the core-pushing rod 7 returns to its original position under the action of the reset spring 10, and the cold core box sand core is cured by using the device, so that the catalyst can be fully preheated in a smaller space, enter the core box cavity with higher activity to catalyze the reaction with the binder, and the air blowing curing time is reduced to within 15-30s. Compared with the traditional core making process, the core making efficiency is improved by more than 50%, the core making beat reaches 60 pieces / hour, and the stability of the sand core size is improved at the same time.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A cold box sand core efficient curing device, characterized in that: include: A blowing plate, wherein a mixing chamber is arranged inside the blowing plate, and a high-temperature compressed air inlet and a catalyst inlet which are connected to the mixing chamber are arranged at one end of the blowing plate; The core push rod mechanism is composed of a core push rod, a fixed block, and an end cover. The fixed block is fixedly connected to the top of the blowing plate, and the end cover is fixedly connected to the top of the fixed block. The fixed block is provided with spring mounting holes distributed in a vertical direction, and a reset spring is provided in the spring mounting hole. The core push rod passes through the end cover, the reset spring, and the lower end of the fixed block from top to bottom in sequence and then extends into the sand shooting hole of the upper core box. An upper core box, a connecting cavity is provided between the upper core box and the blowing plate, and the connecting cavity is connected with the mixing cavity and the sand shooting hole of the upper core box; The upper top core limiting column is fixedly connected above the blowing plate and is used for cooperating with the top core plate of the core making machine for limiting.

2. The cold box sand core efficient curing device according to claim 1, characterized in that: Sealing rings are arranged between the end cover and the top core rod, and between the end cover and the fixing block.

3. The cold box sand core efficient curing device according to claim 1, characterized in that: A positioning pin is fixedly connected below the blowing plate and is used for cooperating and positioning with the upper core box.

4. The cold box sand core efficient curing device according to claim 1, characterized in that: A sealing strip is arranged on the outer side between the blowing plate and the upper core box.

5. The cold box sand core efficient curing device according to claim 1, characterized in that: The core push rod is composed of a fixed rod and a connecting rod. The connecting rod is threadedly connected below the fixed rod and is located in the sand shooting hole of the upper core box.

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