Binder input control system of sand mixer

Abstract

A binder input control system of a sand mixer is connected with the sand mixer and comprises a storage tank used for storing a binder, a discharge port is formed in the upper end of the storage tank, and the inner end and the outer end of the discharge port are connected with a first discharge pipe and a second discharge pipe respectively; the second discharging pipe communicates with a material pumping assembly, the material pumping assembly communicates with a nozzle base through a third discharging pipe, a discharging hole channel is formed in the nozzle base and communicates with the sand mixer, the end, away from the sand mixer, of the discharging hole channel communicates with a conical hole, and a conical nozzle matched with the conical hole is arranged in the conical hole. According to the sand mixer, the atomization of a binder is realized, the binder can be fully mixed with molding sand in the sand mixer, and when the nozzle is closed, the air is continuously sprayed to clean an output port of the nozzle, so that the anti-blocking function is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand mixers, in particular to a binder input control system for a sand mixer. Background Art

[0002] The socket core of a cast pipe is a kind of core specifically used for casting the socket part of a cast pipe. In order to ensure the high precision and high quality of the socket part, it is usually made of high-quality molding sand. During the preparation process, steps such as sand mixing, sand shooting, and hardening are required. Among them, sand mixing is to mix the molding sand and the binder in a certain proportion to form core sand with a certain fluidity. When carrying out sand mixing, a sand mixer system is needed to add the raw molding sand and the binder into the sand mixer in different routes respectively. However, in the existing sand mixer system, the powdery binder is usually directly mixed with the core sand. The inventor finds that it is very easy to have uneven mixing of the binder in the molding sand, and air is easily inhaled during the mixing process of the binder, resulting in caking during the mixing process. Content of the Utility Model

[0003] To solve the technical problems existing in the above background art, the utility model provides a binder input control system for a sand mixer.

[0004] The technical solution of the utility model is as follows:

[0005] A binder input control system for a sand mixer, the system is connected to the sand mixer, and includes a storage tank for storing the binder. An outlet is provided at the upper end of the storage tank, and a first discharge pipe and a second discharge pipe are respectively connected to the inner and outer ends of the outlet;

[0006] The second discharge pipe is communicated with a material pumping assembly, and the material pumping assembly is communicated with a nozzle seat through a third discharge pipe. An outlet hole is opened in the nozzle seat and is communicated with the sand mixer. One end of the outlet hole away from the sand mixer is communicated with a tapered hole, and a tapered nozzle adapted to it is arranged in the tapered hole;

[0007] A cylinder is installed at one end of the nozzle seat away from the sand mixer, and the output rod of the cylinder is connected to the tapered nozzle. An air inlet hole communicating with the tapered nozzle is axially opened in the output rod, and the air inlet hole is communicated with a gas source.

[0008] In order to facilitate the control of the cylinder, the extending air inlet and the retracting air inlet of the cylinder are respectively connected with a solenoid valve through a first air pipe, and the air inlet end of the solenoid valve is connected to the gas source.

[0009] In order to facilitate the connection of the air inlet hole to the gas source, a second air pipe is connected in parallel to the first air pipe connected to the retracting air inlet, and the second air pipe is communicated with the air inlet hole.

[0010] To facilitate the installation of the nozzle seat, an L-shaped seat is fixedly connected to the outside of the sand mixer, and the nozzle seat penetrates through the L-shaped seat and communicates with the sand mixer.

[0011] To provide a nitrogen source and prevent the binder in the storage tank from caking, a safety valve is connected to the upper end of the storage tank, and the safety valve is connected to a pneumatic three-way reversing valve, which communicates with the nitrogen source.

[0012] To facilitate the replenishment of the binder into the storage tank, a feeding pipeline is connected to the upper end of the storage tank, and a first pneumatic angle seat valve is connected to the feeding pipeline.

[0013] To facilitate the control of the connection and closing of the first discharge pipe and the second discharge pipe, a second pneumatic angle seat valve is installed at the upper end of the discharge port and communicates with the first discharge pipe and the second discharge pipe respectively.

[0014] The specific design of the material extraction assembly is that the material extraction assembly includes an injection cylinder installed on one side of the storage tank, and the upper end of the injection cylinder is communicated with the second discharge pipe and the third discharge pipe respectively through a three-way pipe;

[0015] A moving piston is arranged inside the injection cylinder, and it is driven by a driving assembly to slide up and down along the inner wall of the injection cylinder.

[0016] The specific design of the driving assembly is that the driving assembly includes a fixed cylinder communicated with the bottom of the injection cylinder, a driving motor is arranged on one side of the fixed cylinder, and the driving motor is connected to a lead screw through a speed reducer, and the lead screw is located inside the fixed cylinder;

[0017] The lead screw is connected with a threaded cylinder through a thread, and the threaded cylinder is connected to the bottom of the piston.

[0018] The beneficial effects of the present utility model are as follows: The present utility model is a binder input control system for a sand mixer. First, by setting the material extraction assembly, the binder in the storage tank can be transported to the third storage pipe, and then sprayed into the sand mixer in the nozzle seat to realize mixing with the molding sand in the sand mixer; Second, by connecting nitrogen to the top of the storage tank, the caking in the storage tank can be effectively prevented, and the air in the tank is discharged when transporting the binder, reducing the amount of air entering the sand mixer, which can effectively prevent caking during the mixing process of the binder and the molding sand; Finally, by setting a conical nozzle, which is connected to the output rod of the cylinder, the conical nozzle is driven by the cylinder to close or open with the nozzle seat to realize the opening and closing of the binder input pipeline. At the same time, both the nozzle and the air output rod are hollow, and the other end of the output rod is connected to an air pipe, which is controlled by the same solenoid valve. When the output rod contracts to output the binder, air is sprayed to the nozzle to realize the atomization of the binder, so that it can be fully mixed with the molding sand in the sand mixer. When the nozzle is closed, continuous air spraying plays a role in cleaning the output port of the nozzle, thus having an anti-blocking function. Description of the Drawings

[0019] The solutions and advantages of the present application will become clear to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model.

[0020] In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of the sand mixing system;

[0022] Figure 2 is a partial structure diagram of the binder output system;

[0023] Figure 3 is a structure diagram of the material extraction assembly;

[0024] The components represented by the reference numerals in the drawings are:

[0025] 1, sand mixer; 2, storage tank; 3, discharge port; 4, first discharge pipe; 5, second discharge pipe; 6, material extraction assembly; 61, injection cylinder; 62, three-way pipe; 63, moving piston; 64, fixed cylinder; 65, drive motor; 66, lead screw; 67, threaded cylinder; 7, third discharge pipe; 8, nozzle seat; 9, discharge hole passage; 10, conical hole; 11, conical nozzle; 12, air cylinder; 13, output rod; 14, air inlet hole; 15, air source; 16, extended air inlet; 17, retracted air inlet; 18, first air pipe; 19, solenoid valve; 20, second air pipe; 21, L-shaped seat; 22, safety valve; 23, pneumatic three-way changeover valve; 24, nitrogen source; 25, replenishment pipeline; 26, first pneumatic angle seat valve; 27, second pneumatic angle seat valve. Specific embodiments

[0026] The following will describe the exemplary embodiments of the present disclosure in more detail with reference to the drawings.

[0027] Example

[0028] As mentioned in the background art, during the preparation of sand cores, sand mixing is one of the more important steps. When mixing sand, the molding sand and the binder are mixed in a certain ratio. However, when the existing sand mixer 1 is used, there are many defects. On the one hand, the mixing is not sufficient and not uniform, and on the other hand, caking is likely to occur, resulting in poor quality of the sand cores produced. Therefore, the inventor improved the existing sand mixer 1 system and designed a new binder input system to overcome the above problems. The following will be specifically described with reference to the drawings.

[0029] This embodiment provides a control system for inputting binder into a sand mixer. See Figure 1, this system is connected to the sand mixer 1. The sand mixer 1 is of the prior art, and a molding sand feeding port is provided at its upper end. In this solution, the binder is input into the sand mixer 1 for mixing with it. It includes a storage tank 2 for storing the binder. A feeding pipeline 25 is connected to the upper end of the storage tank 2, and a first pneumatic angle seat valve 26 is connected to the feeding pipeline 25. It is a purchased part, and the specific model is DN25. By opening the first pneumatic angle seat valve 26, the storage tank 2 can be replenished with binder in cooperation with the feeding pipeline 25. And in order to monitor the remaining amount of binder in the storage tank 2, a radio frequency admittance level gauge is provided at the upper end of the storage tank 2, and the measuring end extends into the storage tank 2.

[0030] Moreover, a safety valve 22 is connected to the upper end of the storage tank 2. The safety valve 22 is a purchased part, and the specific model can be DN15(0.1Mpa). And the safety valve 22 is connected to a pneumatic three-way changeover valve 23. The pneumatic three-way changeover valve 23 is a purchased part, and the specific model can be DN15 (L type). It is connected to a nitrogen source 24. After the binder in the storage tank 2 is emptied, the air in the storage tank 2 needs to be emptied before adding the binder. The storage tank 2 is exhausted through the cooperation of the pneumatic three-way changeover valve 23 and the safety valve 22.

[0031] On the basis of the above structure, a discharge port 3 is provided at the upper end of the storage tank 2. The inner and outer ends of the discharge port 3 are respectively connected to a first discharge pipe 4 and a second discharge pipe 5. The first discharge pipe 4 extends downward to the bottom of the storage tank 2. And in order to control the connection and disconnection of the first discharge pipe 4 and the second discharge pipe 5, a second pneumatic angle seat valve 27 is installed at the upper end of the discharge port 3. Its model is 1 / 2 caliber, and it is respectively connected to the first discharge pipe 4 and the second discharge pipe 5. When it is necessary to transport the binder to the sand mixer 1, the second pneumatic angle seat valve 27 controls the connection of the first discharge pipe 4 and the second discharge pipe 5.

[0032] In this embodiment, the second discharge pipe 5 is connected to a pumping component 6. The binder can be pumped into the pumping component 6 through the first discharge pipe 4 and the second discharge pipe 5. And the pumping component 6 is connected to a nozzle seat 8 through a third discharge pipe 7. The binder can be pushed into the nozzle seat 8 through the third discharge pipe 7. A discharge hole channel 9 is opened in the nozzle seat 8, which is connected to the sand mixer 1. The binder entering the nozzle seat 8 then enters the sand mixer 1. And one end of the discharge hole channel 9 far from the sand mixer 1 is connected to a tapered hole 10. One end of the tapered hole 10 far from the discharge hole channel 9 penetrates through the nozzle seat 8. And a tapered nozzle 11 adapted to it is arranged in the tapered hole 10. The tapered hole 10 is connected to the discharge hole channel 9 and is also connected to the hole channel for the binder to enter the nozzle seat 8. After the tapered nozzle 11 fits with the tapered hole 10, the binder can be blocked from entering the tapered hole 10 and the discharge hole channel 9. After they are separated, the binder can flow to the tapered hole 10.

[0033] Moreover, for the convenience of fixing the nozzle seat 8, an L-shaped seat 21 is fixedly connected to the outside of the sand mixer 1. The nozzle seat 8 penetrates through the L-shaped seat 21 and communicates with the sand mixer 1. The nozzle seat 8 is divided into two parts. The size of one end close to the sand mixer 1 is smaller than that of the end far from the sand mixer 1. The end with a larger size fits against the outside of the L-shaped seat 21, and the end with a smaller size penetrates through the L-shaped seat 21 and communicates with the sand mixer 1.

[0034] In this embodiment, in combination with Figure 1 and Figure 3 , in order to facilitate the addition of the binder in the storage tank 2 into the nozzle seat 8, the material extraction assembly 6 includes an injection cylinder 61 installed on one side of the storage tank 2. The upper end of the injection cylinder 61 is respectively communicated with the second discharge pipe 5 and the third discharge pipe 7 through a three-way pipe 62. The binder is sucked into the storage tank 2 through the second discharge pipe 5 and added into the nozzle seat 8 through the third discharge pipe 7. A moving piston 63 is arranged inside the injection cylinder 61 and is driven by a driving assembly to slide up and down along the inner wall of the injection cylinder 61. Among them, the driving assembly includes a fixed cylinder 64 with the bottom communicated with the injection cylinder 61. The diameter of the fixed cylinder 64 is smaller than that of the injection cylinder 61. A driving motor 65 is arranged on one side of the fixed cylinder 64, and the driving motor 65 is connected with a lead screw 66 through a speed reducer. The lead screw 66 is located inside the fixed cylinder 64. The driving motor 65 can drive the lead screw 66 to rotate inside the fixed cylinder 64. The lead screw 66 is threadedly connected with a threaded cylinder 67. The threaded cylinder 67 is arranged as shown in the figure to ensure that it will not rotate and can only move in the vertical direction. The lead screw 66 can drive the threaded cylinder 67 to move up and down through the thread, and the threaded cylinder 67 is connected to the bottom of the piston. The moving piston 63 moves up and down through the movement of the threaded cylinder 67 to realize the actions of sucking and pushing materials.

[0035] It should be noted that when providing the adhesive in the nozzle seat 8, the pneumatic three-way change-over valve 23 continuously introduces nitrogen into the storage tank 2. The nitrogen enters the nozzle seat 8 together with the binder through the first discharge pipe 4, the second discharge pipe 5 and the third discharge pipe 7, and then enters the sand mixer 1 through the discharge hole channel 9 together with the binder, which can effectively prevent caking during the mixing process of the binder and the molding sand.

[0036] In combination with Figure 2 , the fitting and separation of the conical nozzle 11 and the conical hole 10 are mainly realized through the following design. A cylinder 12 is installed at the end of the nozzle seat 8 far from the sand mixer 1, and the output rod 13 of the cylinder 12 is connected to the conical nozzle 11, which can drive the conical nozzle 11 to move towards and away from the sand mixer 1, so as to realize the fitting and separation from the conical hole 10.

[0037] On the basis of the above structure, in order to atomize the binder, an air inlet hole 14 communicating with the conical nozzle 11 is axially formed in the output rod 13, and the air inlet hole 14 is communicated with an air source 15. Compressed air is sent into the air inlet hole 14 through the air source 15, and the binder entering the nozzle seat 8 is blown into the sand mixer 1 in a mist form through the discharge hole passage 9 to be mixed with the molding sand.

[0038] Meanwhile, in order to automatically control the movement of the cylinder 12, an air inlet 16 for the cylinder 12 to extend and an air inlet 17 for the cylinder 12 to retract are respectively connected with a solenoid valve 19 through a first air pipe 18, and the air inlet end of the solenoid valve 19 is connected with the air source 15. The on-off of the cylinder 12 is controlled through the solenoid valve 19. Moreover, a second air pipe 20 is connected in parallel with the first air pipe 18 connected to the retraction air inlet 17, and the second air pipe 20 is communicated with the air inlet hole 14. That is, when the cylinder 12 controls the output rod 13 to contract, the first air pipe 18 on this path supplies air into the second air pipe 20, and the compressed air is sent into the air inlet hole 14, so as to provide wind force for the binder to enter the sand mixer 1. And after the feeding into the sand mixer 1 is finished, the compressed air continues to be supplied to clean the conical hole 10 and the discharge hole passage 9 to prevent blockage.

[0039] Specifically, after the binder in the storage tank 2 is used up, first, the gas in the storage tank 2 is emptied through the pneumatic three-way changeover valve 23. The binder source is added into the storage tank 2 at the replenishing pipeline 25 through components such as a pump, and nitrogen is input into the tank to prevent caking. The second angle seat valve connects the first discharge pipe 4 and the second discharge pipe 5. The driving motor 65 is started to drive the moving piston 63 to move downward. The binder enters the injection cylinder 61 through the first discharge pipe 4 and the second discharge pipe 5 due to the pressure difference. The second angle seat valve is closed. The driving motor 65 drives the moving piston 63 to move upward. At the same time, the cylinder 12 drives the conical nozzle 11 to leave the conical hole 10, and the binder is pressed into the nozzle seat 8 through the third discharge pipe 7. The compressed air enters the air inlet hole 14 through the first air pipe 18 and the second air pipe 20, and the binder is blown into the sand mixer 1 through the conical nozzle 11.

Claims

1. A binder input control system for a sand mixer, the system being connected to the sand mixer (1), characterized in that, It includes a storage tank (2) for storing a binder. An outlet (3) is provided at the upper end of the storage tank (2), and a first discharge pipe (4) and a second discharge pipe (5) are respectively connected to the inner and outer ends of the outlet (3). The second discharge pipe (5) is communicated with a material pumping assembly (6), and the material pumping assembly (6) is communicated with a nozzle seat (8) through a third discharge pipe (7). A discharge hole passage (9) is opened in the nozzle seat (8), which is communicated with a sand mixer (1). One end of the discharge hole passage (9) far from the sand mixer (1) is communicated with a conical hole (10), and a conical nozzle (11) adapted to the conical hole (10) is arranged in the conical hole (10). A cylinder (12) is installed at one end of the nozzle seat (8) far from the sand mixer (1), and an output rod (13) of the cylinder (12) is connected to the conical nozzle (11). An air inlet hole (14) communicated with the conical nozzle (11) is axially opened in the output rod (13), and the air inlet hole (14) is communicated with an air source (15).

2. The binder input control system of the muller according to claim 1, characterized in that, An air inlet (16) and a retraction air inlet (17) of the cylinder (12) are respectively connected with a solenoid valve (19) through a first air pipe (18), and an air inlet end of the solenoid valve (19) is connected to the air source (15).

3. The binder input control system of the muller according to claim 2, characterized in that A second air pipe (20) is connected in parallel to the first air pipe (18) connected to the retraction air inlet (17), and the second air pipe (20) is communicated with the air inlet hole (14).

4. The sand mixer binder input control system according to claim 1, characterized in that An L-shaped seat (21) is fixedly connected to the outside of the sand mixer (1), and the nozzle seat (8) penetrates through the L-shaped seat (21) and is communicated with the sand mixer (1).

5. The binder input control system of the muller according to claim 1, characterized in that A safety valve (22) is communicated with the upper end of the storage tank (2), and the safety valve (22) is connected with a pneumatic three-way reversing valve (23), which is communicated with a nitrogen source (24).

6. The binder input control system of the muller according to claim 1, wherein A feeding pipeline (25) is communicated with the upper end of the storage tank (2), and a first pneumatic angle seat valve (26) is connected at the feeding pipeline (25).

7. The binder input control system of the muller according to claim 1, wherein A second pneumatic angle seat valve (27) is installed at the upper end of the outlet (3), and is respectively communicated with the first discharge pipe (4) and the second discharge pipe (5).

8. The sand mixer binder input control system according to claim 7, characterized in that, The material pumping assembly (6) includes an injection cylinder (61) installed on one side of the storage tank (2). The upper end of the injection cylinder (61) is respectively communicated with the second discharge pipe (5) and the third discharge pipe (7) through a three-way pipe (62). A moving piston (63) is arranged inside the injection cylinder (61), and is driven by a driving assembly to slide up and down along the inner wall of the injection cylinder (61).

9. The binder input control system of the sand mixer according to claim 8, wherein The driving assembly includes a fixed cylinder (64) communicated with the bottom of the injection cylinder (61). A driving motor (65) is arranged on one side of the fixed cylinder (64), and the driving motor (65) is connected with a lead screw (66) through a speed reducer. The lead screw (66) is located inside the fixed cylinder (64). The lead screw (66) is connected with a threaded cylinder (67) through a thread, and the threaded cylinder (67) is connected to the bottom of the moving piston (63).

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