Sand mixer

Abstract

A sand mixer comprises a rack, a sand mixer body is arranged at the bottom in the rack, a raw material sand bin is arranged on the rack, a control valve is arranged at a discharging port of the raw material sand bin, and the discharging port is communicated with a sand inlet of the sand mixer body; a sand outlet of the sand mixer main body is communicated with the core shooter; a plurality of resin storage bins are arranged in the rack on one side of the sand mixer main body, injection barrels are mounted on the outer sides of the resin storage bins, and the upper ends of the injection barrels are communicated with the resin storage bins through feeding pipes and are communicated with the sand mixer main body through discharging pipes; a feeding assembly is arranged at the bottom of the injection cylinder. The automation degree of the device is improved, resin raw materials with quantitative weight can be sucked in the resin storage bin, the resin raw materials and sand raw materials can be mixed according to a preset weight proportion, the matching is not influenced by environmental factors such as temperature, the influence of different densities of different resins on the volume is avoided, and the production efficiency is improved. Therefore, the proportioning is more accurate, and the quality of the manufactured bell mouth sand core is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of a sand mixer main body, in particular to a sand mixer. Background Art

[0002] During the casting process of castings, in order to form the socket of the continuous cast iron pipe, a socket sand core is needed, which is mainly responsible for forming the required size and shape inside the casting. The preparation process of the socket sand core usually requires raw material preparation, core making, drying and inspection to ensure the quality and dimensional accuracy of the socket sand core.

[0003] The preparation of the socket sand core usually requires that a variety of resins and sand raw materials be quantitatively mixed according to a certain volume ratio after the raw materials are prepared, and then transported to the core making machine for core making. The mixing of the raw materials requires the use of a sand mixer body. The existing sand mixer body requires a large amount of manual input to control the amount of raw materials input, and the above raw materials are usually mixed in a volumetric quantitative manner, which is greatly affected by the environment. For example, different temperatures will cause the volume of the raw materials to change, and changes in the density of the raw materials will also affect the volume of the raw materials, so that the raw materials cannot be mixed according to the set ratio, affecting the quality of the prepared sand core. Although the existing continuous sand mixer has the advantages of high efficiency, low energy consumption, and small size, it has long been unable to achieve continuous and accurate quantitative feeding, and the sand mixing ratio has fluctuated, resulting in no guarantee of sand mixing quality. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides a sand mixer.

[0005] The technical solution of this utility model is as follows:

[0006] A sand mixer, wherein a sand mixer body is arranged at the bottom of the frame, a raw material sand bin is arranged on the frame, a control valve is arranged at the discharge port of the raw material sand bin, and the discharge port is communicated with the sand inlet of the sand mixer body;

[0007] The sand outlet of the sand mixer body is connected to the core shooting machine;

[0008] A plurality of resin storage bins are arranged in a frame on one side of the sand mixer body, an injection cylinder is installed outside the resin storage bin, and the upper end of the injection cylinder is connected to the resin storage bin through a feed pipe and connected to the sand mixer body through a discharge pipe;

[0009] The bottom of the injection cylinder is provided with a feeding assembly, which can suck the resin into the injection cylinder through the feeding pipe and transport it to the sand mixer body through the discharging pipe.

[0010] In order to facilitate the temporary storage of the sand raw materials added to the sand mixer body, a measuring sand hopper is provided between the raw material sand bin and the sand mixer body, and the measuring sand hopper is installed on the frame.

[0011] In order to detect the weight of the sand in the measuring sand hopper in real time, a weighing sensor is installed between the measuring sand hopper and the frame.

[0012] In order to facilitate the connection of the feed pipe and the discharge pipe to the injection barrel, a three-way pipe is connected to the top of the injection barrel and is respectively connected to the feed pipe and the discharge pipe.

[0013] In order to conveniently control the opening and closing of the feed pipe and the discharge pipe and realize the in and out of the resin raw material, the feed pipe and the discharge pipe are connected with pneumatic valves at positions close to the three-way pipe.

[0014] In order to monitor the change in the amount of resin in the injection cylinder and to provide feedback on the change in weight of the injected resin, the injection cylinder is connected to the resin storage bin via a bracket, and a weighing sensor is installed between the two.

[0015] The feeding assembly is specifically designed as follows: the feeding assembly includes a servo motor arranged at the bottom of the injection barrel, and the output end of the servo motor is connected to a ball screw, the threaded connection of the ball screw is connected to a sleeve, and the sleeve extends into the injection barrel and is connected to a piston, and the piston is slidably connected to the inner wall of the injection barrel.

[0016] In order to improve the mixing effect of the resin and the sand, a resin atomizer is installed at the connection position between the discharge pipe and the sand mixer body.

[0017] In order to fully mix the resin and sand in the sand mixer body and increase the mixing time, the sand inlet is arranged at the end away from the sand outlet, and the horizontal distance between the resin atomizer farthest from the sand inlet and the sand inlet is 1 / 6-1 / 5 of the length of the sand mixer body.

[0018] In order to prevent the resin in the resin storage bin from being crusted, an air inlet is provided at the upper end of the resin storage bin, and the air inlet is connected to a nitrogen source, and an air inlet pipe connected to the air inlet is provided in the resin storage bin.

[0019] The beneficial effects of the utility model are as follows: the utility model is a sand mixer, which firstly provides a raw material sand bin and a plurality of resin storage bins, and can respectively transport the internal raw materials to the sand mixer body, and the sand mixer body can achieve mixing of a plurality of raw materials and transport them to the core shooting machine; secondly, by providing a feeding assembly in cooperation with a feeding pipe and a discharging pipe, the resin raw material in the resin storage bin can be automatically transported to the sand mixer body, thereby improving the automation degree of the device, and by setting the opening of a control valve, the weight of the material discharged from the raw material sand bin can be achieved, and by the system setting of a servo motor, the weight-quantified resin raw material can be absorbed in the resin storage bin, so that it can be mixed with the sand raw material according to a preset weight ratio, thereby replacing the volume-quantified proportioning method in the prior art, so that the proportioning is not affected by environmental factors such as temperature, and the influence of different densities of different resins on the volume is avoided, so that the proportioning is more accurate, and the quality of the manufactured socket sand core is guaranteed; finally, by setting a weighing sensor, the weight of the raw materials in the metering hopper and the injection barrel can be monitored in real time, so that it is convenient to record and observe and adjust the weight of the required raw materials according to the weight display. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, the scheme and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not considered to be limiting of the present invention.

[0021] In the attached picture:

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a partial schematic diagram of the utility model;

[0024] Figure 3 It is a partial side view of the utility model;

[0025] Figure 4 It is a cross-sectional view of the feeding component;

[0026] The components represented by the reference numerals in the figure are:

[0027] 1. Frame; 2. Sand mixer body; 3. Raw material sand bin; 4. Control valve; 5. Sand inlet; 6. Sand outlet; 7. Core shooter; 8. Resin storage bin; 9. Injection barrel; 10. Feed pipe; 11. Discharge pipe; 12. Feeding assembly; 121. Servo motor; 122. Ball screw; 123. Sleeve; 124. Piston; 13. Measuring sand hopper; 14. Weighing sensor; 15. Three-way pipe; 16. Pneumatic valve; 17. Bracket; 18. Resin atomizer; 19. Air inlet; 20. Nitrogen source; 21. Air inlet pipe; 22. Electric control cabinet. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0029] Example

[0030] As mentioned in the background technology, when preparing the socket sand core, the mixing of raw materials has certain defects. The traditional sand mixer main body 2 requires a lot of manpower to control the amount of raw materials input, and a variety of raw materials are proportioned in a volumetric manner. In actual use, the inventor found that factors such as temperature and density will affect the volume weight of the raw materials, which in turn affects the proportion of the mixed raw materials, reducing the quality of the finished socket sand core. Therefore, the inventor has improved the traditional sand mixer and designed a new sand mixer device, which is described in detail below with reference to the drawings.

[0031] This embodiment provides a sand mixer, see Figure 1 , including a frame 1, the frame 1 is a rectangular frame, a sand mixer body 2 is arranged at the bottom of the frame 1, the sand mixer body 2 adopts a 6-10T / H continuous sand mixer, a raw material sand bin 3 is arranged on the frame 1, the upper end of the raw material sand bin 3 can be fixed by a fixing frame, the raw material sand bin 3 is located above the frame 1 as a whole, and a control valve 4 is arranged at the discharge port of the raw material sand bin 3, the control valve 4 adopts an electric valve, specifically an electric discharge valve, which is a purchased part, and can be controlled by the opening of the control valve 4 and The opening time controls the weight of the sand discharged, and the discharge port is connected with the sand inlet 5 of the sand mixer body 2, and the sand outlet 6 of the sand mixer body 2 is connected with the core shooter 7, so that the sand in the raw material sand bin 3 can be transported to the core shooter 7 through the sand mixer body 2, and the sand mixer body 2 is horizontally arranged, and the sand inlet 5 and the sand outlet 6 are respectively located at the upper and lower ends of the sand mixer body 2, which can increase the mixing time of the raw materials in the sand mixer body 2, and the sand outlet 6 is connected to the exhaust pipe to avoid environmental pollution problems.

[0032] On the basis of the above structure, in order to temporarily store the sand entering the sand mixer body 2 and ensure that its weight fully meets the required value, a measuring sand hopper 13 is arranged between the raw sand bin 3 and the sand mixer body 2, and the measuring sand hopper 13 is installed on the frame 1. The upper and lower ends of the measuring sand hopper 13 are respectively connected with the raw sand bin 3 and the sand mixer body 2, and a valve is arranged at the lower end. In order to monitor the weight of the sand in the measuring hopper in real time and prevent the weight of the sand required next time from being affected by any residue, a weighing sensor 14 is installed between the measuring sand hopper 13 and the frame 1. The weighing sensor 14 adopts a bellows weighing sensor, which can monitor the weight of the sand in the measuring hopper in real time.

[0033] In this embodiment, the storage and transportation method of multiple resins is as follows: multiple resin storage bins 8 are arranged in the frame 1 on one side of the sand mixer body 2, and the resin storage bins 8 are equipped with a heating device to avoid a series of problems caused by poor resin fluidity due to low temperature in winter. In this embodiment, two are arranged to store the required raw resins. An injection cylinder 9 is installed on the outside of the resin storage bin 8. The injection cylinder 9 is vertically arranged, and the upper end of the injection cylinder 9 is connected to the resin storage bin 8 through a feeding pipe 10, and the feeding pipe 10 extends to a position near the bottom of the resin storage bin 8, and is connected to the sand mixer body 2 through a discharge pipe 11. In order to enable the resin raw material to enter the sand mixer body 2, a feeding assembly 12 is arranged at the bottom of the injection cylinder 9. The feeding assembly 12 can allow the resin raw material in the resin storage bin 8 to enter the injection cylinder 9 through the feeding pipe 10, and then enter the sand mixer body 2 through the discharge pipe 11.

[0034] Moreover, during the production process, the inventor also found that the combination Figure 3 Since a large amount of resin is temporarily stored in the resin storage bin 8, crusting is prone to occur. In order to avoid this defect, an air inlet 19 is provided at the upper end of the resin storage bin 8, and the air inlet 19 is connected to a nitrogen source 20. An air inlet pipe 21 connected to the air inlet 19 is provided in the resin storage bin 8. Nitrogen is filled into the resin storage bin 8 through the nitrogen source 20, which can inhibit the inhibition of oxygen and effectively prevent the phenomenon of resin crusting.

[0035] In this embodiment, combined with Figure 4 The feeding assembly 12 includes a servo motor 121 disposed at the bottom of the injection barrel 9, and the output end of the servo motor 121 is connected to a ball screw 122, specifically a SFU02005-4 model, the threaded connection of the ball screw 122 is connected to a sleeve 123, and the sleeve 123 extends into the injection barrel 9 and is connected to a piston 124, and the piston 124 is slidably connected to the inner wall of the injection barrel 9, the ball screw 122 is driven to rotate by the servo motor 121, and then the sleeve 124 is driven to move along the ball screw 122 through the thread. The piston 124 moves up and down along the inner wall of the injection barrel 9. In order to ensure the smooth movement of the piston 124, the rotation speed of the servo motor 121 can be controlled by setting the servo motor 121, and the rotation speed of the ball screw 122 is controlled so that the piston 124 moves along with the sleeve 123. The distance corresponds to the weight of the inhaled resin, so as to ensure that the resin is quantitatively sucked into the injection barrel 9 through the feed pipe 10, and then the servo motor 121 is controlled to reverse at an appropriate speed to push the inhaled resin into the sand mixer body 2 through the discharge pipe 11.

[0036] The injection barrel 9 is connected to the resin storage bin 8 through a bracket 17, and a weighing sensor 14 is installed between the two. By setting the weighing sensor 14, specifically a bellows weighing sensor, and the weighing sensor 14 is connected to a display screen, the weight of the resin in the injection barrel 9 can be monitored in real time, ensuring that the weight of the remaining resin in the injection barrel 9 can be read, and the amount of resin added to the sand mixer body 2 can be fed back to ensure that when the resin is added multiple times, the internal residue will not affect the subsequent addition. The ball screw 122 drives the piston 124 to move, so that the resin can be sucked in, and the sucked weight per rotation of the ball screw 122 is calculated, and then the number of revolutions driven by the servo motor 121 to rotate the ball screw 122 is calculated according to the ratio, and the required amount of resin is sucked into the injection barrel 9.

[0037] On the basis of the above structure, a three-way pipe 15 is connected to the top of the injection cylinder 9, combined with Figure 2 The three-way pipe 15 is connected to the feed pipe 10 and the discharge pipe 11 respectively, and in order to ensure that the feed pipe 10 and the discharge pipe 11 do not affect each other when the resin is sucked in or pushed out, a pneumatic valve 16 is connected to the feed pipe 10 and the discharge pipe 11 near the three-way pipe 15. The specific model of the pneumatic valve 16 is a DN15 angle valve. When the resin is sucked in, the pneumatic valve 16 of the feed pipe 10 is in an open state, and the pneumatic valve 16 of the discharge pipe 11 is in a closed state. When the resin is pushed out, the states of the two pneumatic valves 16 are opposite.

[0038] In this embodiment, a resin atomizer 18 is installed at the connection position between the discharge pipe 11 and the sand mixer body 2, and the output end of the resin atomizer 18 is connected to the inside of the sand mixer body 2. The resin atomizer 18 can spray the resin powder in the discharge pipe 11 into the sand mixer body 2 in the form of a spray. A pressure atomizing nozzle can be used to complete the spraying of powder particles. Purchased parts can be used and no unnecessary details are given. The resin powder after spraying can be fully mixed with the sand in the sand mixer body 2 to improve the mixing effect, and the resin atomizer 18 should not be too far away from the sand inlet. In this embodiment, the horizontal distance between the resin atomizer 18 farthest from the sand inlet 5 and the sand inlet 5 is 1 / 6-1 / 5 of the length of the sand mixer body 2, so that the resin can be mixed and contacted with the sand entering at the sand inlet 5 earlier, and can be mixed for a longer time in the sand mixer body 2.

[0039] In order to improve the degree of automation of the device, an electric control cabinet 22 is provided on one side of the frame 1. All the valves, weighing sensors 14, sand mixer body 2, resin atomizer 18 and servo motor 121 involved above are electrically connected to the electric control cabinet 22, and the actions of the above components can be adjusted and controlled according to actual needs.

Claims

1. A sand mixer, comprising a frame (1), wherein a sand mixer body (2) is arranged at the bottom of the frame (1), characterized in that: The frame (1) is provided with a raw material sand bin (3), the discharge port of the raw material sand bin (3) is provided with a control valve (4), and the discharge port is communicated with a sand inlet (5) of the sand mixer body (2); The sand outlet (6) of the sand mixer body (2) is connected to the core shooter (7); A plurality of resin storage bins (8) are arranged in a frame (1) on one side of the sand mixer body (2), an injection cylinder (9) is installed outside the resin storage bin (8), and the upper end of the injection cylinder (9) is connected to the resin storage bin (8) through a feed pipe (10), and is connected to the sand mixer body (2) through a discharge pipe (11); The bottom of the injection cylinder (9) is provided with a feeding assembly (12), which can suck the resin into the injection cylinder (9) through the feeding pipe (10) and transport it into the sand mixer body (2) through the discharging pipe (11).

2. A sand mixer according to claim 1, characterized in that: A measuring sand hopper (13) is provided between the raw material sand bin (3) and the sand mixer body (2), and the measuring sand hopper (13) is installed on the frame (1).

3. A sand mixer according to claim 2, characterized in that: A weighing sensor (14) is installed between the measuring sand hopper (13) and the frame (1).

4. A sand mixer according to claim 1, characterized in that: The top of the injection cylinder (9) is connected with a three-way pipe (15), which is respectively connected to the feed pipe (10) and the discharge pipe (11).

5. A sand mixer according to claim 4, characterized in that: The positions of the feed pipe (10) and the discharge pipe (11) close to the three-way pipe (15) are both connected with pneumatic valves (16).

6. A sand mixer according to claim 1, characterized in that: The injection cylinder (9) is connected to the resin storage bin (8) via a bracket (17), and a weighing sensor (14) is installed between the two.

7. A sand mixer according to claim 1, characterized in that: The feeding assembly (12) comprises a servo motor (121) arranged at the bottom of the injection barrel (9), and the output end of the servo motor (121) is connected to a ball screw (122), the thread of the ball screw (122) is connected to a sleeve (123), and the sleeve (123) extends into the injection barrel (9) and is connected to a piston (124), and the piston (124) is slidably connected to the inner wall of the injection barrel (9).

8. A sand mixer according to claim 1, characterized in that: A resin atomizer (18) is installed at the connection position between the discharge pipe (11) and the sand mixer body (2).

9. A sand mixer according to claim 8, characterized in that: The sand inlet (5) is arranged at one end away from the sand outlet (6), and the horizontal distance between the resin atomizer (18) farthest from the sand inlet (5) and the sand inlet (5) is 1 / 6-1 / 5 of the length of the sand mixer body (2).

10. A sand mixer according to claim 1, characterized in that: An air inlet (19) is provided at the upper end of the resin storage bin (8), and the air inlet (19) is connected to a nitrogen source (20). An air inlet pipe (21) communicating with the air inlet (19) is provided inside the resin storage bin (8).

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