Sand mixing system of 3D printing equipment

Abstract

According to the sand mixing system of the 3D printing equipment, sand is added into a sand storage box through a sand adding hopper, the sand in the sand storage box is conveyed to a sand mixing machine through a first lifting auger and a second lifting auger, auxiliary materials are added into the sand mixing machine through weight loss type feeding equipment, and mixed sand materials obtained after mixing in the sand mixing machine enter a sand mixing temporary storage hopper; the sand mixing system comprises a complete machine control system, the sand storage box comprises two sand storage cavities, each sand storage cavity is provided with a sand inlet and a sand outlet, a discharge port of the sand adding hopper is selectively aligned with one sand inlet, the conveying device comprises two lifting augers, the lifting augers and the sand storage cavities are arranged in a one-to-one correspondence mode, and the lifting augers are arranged in the sand storage cavities. The two ends of the lifting auger are connected with the sand outlet and the sand mixer correspondingly, and the sand mixer is connected with the mixed sand temporary storage hopper. According to the sand mixing device, mixing of two kinds of sand and auxiliary materials can be achieved, rapid switching of the two kinds of sand can be achieved in the printing process, sand mixing can be rapidly and efficiently completed, the auxiliary materials can be automatically and quantitatively added, and the intelligence and production efficiency of equipment can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of 3D printing, and in particular to a sand mixing system of 3D printing equipment. Background Art

[0002] When sand mold 3D printing technology is applied in the foundry industry, its efficient printing method effectively shortens the development time of new castings, saves development costs, and promotes development. China's foundry equipment is showing an upward trend year by year, and the required casting output is bound to increase. The increase in casting demand will promote the rapid development of sand mold 3D printing equipment.

[0003] The existing sand mold 3D printing process requires the mixing of sand powder materials. Generally, the sand mixing system mixes sand and curing agent, and sometimes auxiliary materials (such as flame retardants, etc.) are added for mixing. However, the existing sand mixing and feeding system of sand mold 3D printing equipment currently has the following defects:

[0004] 1. The current sand mixing system on the market is not integrated enough, and cannot achieve the mixing of two types of sand with auxiliary materials, and cannot achieve rapid switching of two types of sand during the printing process. The two types of sand can be new sand and old sand, or two other types of sand.

[0005] 2. During printing, it is impossible to automatically add the auxiliary materials (such as flame retardants, etc.) that need to be added. Usually, manual premixing is required, which is time-consuming and labor-intensive, resulting in long process time, low efficiency and poor safety. In addition, manual addition of materials will cause the sand powder materials required by the sand mold 3D printer generated in different batches to have uneven contents of various components, thus affecting the model printing quality of the sand mold 3D printer.

[0006] Therefore, it is necessary to design a sand mixing system for 3D printing equipment that can overcome the above-mentioned defects. Summary of the invention

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a sand mixing system for a 3D printing device, which can realize the mixing of two types of sand with auxiliary materials respectively, can achieve rapid switching of the two types of sand during the printing process, complete the sand mixing quickly and efficiently, and can automatically add auxiliary materials in a quantitative manner, thereby improving the intelligence and production efficiency of the 3D printing equipment.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A sand mixing system for 3D printing equipment comprises a sand adding device, a sand storage device, an auxiliary material adding device, a conveying device, a sand mixing device and a temporary storage hopper for sand mixing, wherein sand is added into the sand storage device through the sand adding device, the conveying device conveys the sand in the sand storage device to the sand mixing device, the auxiliary material adding device adds auxiliary materials to the sand mixing device, and the mixed sand material in the sand mixing device enters the temporary storage hopper for sand mixing, and is characterized in that:

[0010] The sand mixing system of the 3D printing equipment includes a whole machine control system,

[0011] The sand storage device is configured as a sand storage box, the sand storage box includes two sand storage chambers, each of the sand storage chambers is provided with a sand inlet and a sand outlet, the sand adding device is configured as a sand adding hopper, the discharge port of the sand adding hopper can be selectively aligned with one of the sand inlets, the conveying device includes two lifting augers for conveying sand in the sand storage device, the lifting augers and the sand storage chambers are provided in one-to-one correspondence,

[0012] The sand mixing device is configured as a sand mixer, the sand outlet is fixedly connected to the lower end of the lifting auger, the higher end of the lifting auger is connected to the sand mixer, and the sand mixer is connected to the temporary storage hopper for mixing sand.

[0013] Preferably, the auxiliary material adding device is configured as a loss-in-weight feeding device, and the accuracy of the loss-in-weight feeding device is ±5‰.

[0014] Preferably, the two sand storage chambers are both provided with a feeding warning material level detection switch and a shutdown warning material level detection switch, and the feeding warning material level detection switch is located above the shutdown warning material level detection switch.

[0015] When the feeding warning material level detection switch detects that the sand level has reached this position, it warns that sand needs to be added; when the shutdown warning material level detection switch detects that the sand level has reached this position, it warns the equipment to shut down. The feeding warning material level detection switch and the shutdown warning material level detection switch are electrically connected to the whole machine control system.

[0016] Preferably: a pneumatic vibrator is fixed on the outer side wall of the sand storage box.

[0017] Preferably: a material level detection switch is provided on the sand mixing temporary storage hopper, and the material level detection switch is used to detect whether there is material in the sand mixing temporary storage hopper, and the material level detection switch is electrically connected to the whole machine control system.

[0018] Preferably: the sand mixing temporary storage hopper is located obliquely below the sand mixer, the side wall of the sand mixer is provided with a sand mixing discharge port, the top of the sand mixing temporary storage hopper is provided with a sand mixing receiving port, and the sand mixing discharge port and the sand mixing receiving port are fixedly connected through a transition shell.

[0019] Preferably, two sand inlets are adjacently opened on the top of the sand storage box, and a support and limiting plate for placing the sand adding hopper is fixed on the top of the sand storage box near each sand inlet.

[0020] Preferably, a gate valve is provided at the bottom of the sand adding hopper, and the gate valve controls the opening or closing of the discharge port of the sand adding hopper.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] The sand adding device of the 3D printing system of the present invention is set as a sand adding hopper, the sand storage device is set as a sand storage box, the sand storage box is provided with a first sand storage cavity and a second sand storage cavity, the auxiliary material adding device is set as a weightless feeding device, the conveying device includes a first lifting auger and a second lifting auger, the sand mixing device is set as a sand mixer, the first sand outlet of the first sand storage cavity is connected to the lower end of the first lifting auger, the high end of the first lifting auger is connected to the sand mixer, the second sand outlet of the second sand storage cavity is connected to the lower end of the second lifting auger, and the high end of the second lifting auger is connected to the sand mixer. The first lifting auger conveys the sand in the first sand storage cavity to the sand mixer, and the second lifting auger conveys the sand in the second sand storage cavity to the sand mixer. If it is necessary to add a flame retardant, the flame retardant can be put into the weightless feeding device, and the weightless feeding device conveys the flame retardant to the sand mixer. The sand mixer mixes the sand in the first sand storage chamber or the second sand storage chamber with the auxiliary materials output by the loss-in-weight feeding equipment. After the sand mixing is completed, the sand mixer discharges the mixed sand into the temporary sand mixing storage hopper, and then the sand mold 3D printing equipment will suck it away from the temporary sand mixing storage hopper through the vacuum suction machine.

[0023] The discharge port of the sand adding hopper can be selectively aligned with the first sand inlet and the second sand inlet. If the first sand storage chamber needs to add sand, the sand adding hopper filled with sand is aligned with the first sand inlet. Of course, if the second sand storage chamber needs to add sand, the sand adding hopper filled with sand is aligned with the second sand inlet.

[0024] The weightless feeding equipment can accurately and quantitatively add flame retardants. Since the weight of the auxiliary materials added can be accurately and quantitatively controlled, the ratio of the auxiliary materials to the sand can be precisely controlled, which can ensure the quality of the mixed sand, the quality of the model printing, and the consistency of the model printing quality of different printing batches of the same product.

[0025] After adding sand, you can set which sand storage chamber to use for printing in the whole machine control system as needed, that is, you can choose to use new sand in the first sand storage chamber, or old sand in the second sand storage chamber, or choose to use sand from both sand storage chambers at the same time. At the same time, you can set the weight of each sand mixing, the amount of curing agent added, and the amount of flame retardant added in the whole machine control system. After setting the parameters, you can choose automatic operation, and the sand mixing system of the 3D printing equipment starts working.

[0026] The sand mixing system of the 3D printing device of the present invention can realize the mixing of two types of sand with auxiliary materials respectively, can achieve rapid switching of the two types of sand during the printing process, quickly and efficiently complete the sand mixing, and can automatically add auxiliary materials in a quantitative manner, thereby improving the intelligence and production efficiency of the 3D printing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a sand mixing system of a 3D printing device of the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the structure of the sand mixing system of the 3D printing equipment after removing the protective cover;

[0029] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the sand mixing system of the 3D printing equipment after removing the protective cover from another angle;

[0030] Figure 4 It is a top view structural diagram of the sand mixing system of the 3D printing equipment;

[0031] In the figure: 1. sand storage box; 100. middle partition; 101. first sand storage chamber; 1011. first sand inlet; 1012. first sand outlet; 1013. first feeding warning material level detection switch; 1014. first shutdown warning material level detection switch; 102. second sand storage chamber; 1021. second sand inlet; 1022. second sand outlet; 1023. second feeding warning material level detection switch; 1024. second shutdown warning material level detection switch; 103. support limit plate; 2. sand adding hopper; 301. first lifting auger; 302. second lifting auger; 4. sand mixer; 5. temporary storage hopper for sand mixing; 501. material level detection switch; 6. weightless feeding equipment; 7. pneumatic vibrator; 8. transition shell; 9. protective cover. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the claims attached to the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] In addition, although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0035] like Figures 1 to 4 As shown, a sand mixing system of a 3D printing device includes a sand adding device, a sand storage device, an auxiliary material adding device, a conveying device, a sand mixing device and a temporary storage hopper for mixed sand. Sand is added to the sand storage device through the sand adding device, the conveying device conveys the sand in the sand storage device to the sand mixing device, the auxiliary material adding device adds auxiliary materials to the sand mixing device, and the mixed sand material mixed in the sand mixing device enters the temporary storage hopper for mixed sand. The sand mixing system of the 3D printing device includes a whole machine control system, and the whole machine control system is used to control the operation of each electronic control component of the 3D printing device. The sand mixing system of the 3D printing device can set which sand storage chamber to use when printing in the whole machine control system as needed, that is, it can choose to use the new sand in the first sand storage chamber 101, or the old sand in the second sand storage chamber 102, or choose to use the sand in both sand storage chambers at the same time, and at the same time, the weight of each sand mixing, the amount of curing agent added, and the amount of flame retardant added can be set in the whole machine control system.

[0036] The sand storage device is set as a sand storage box 1, and the sand storage box 1 includes two sand storage chambers, each of which is provided with a sand inlet and a sand outlet. The two sand storage chambers are respectively a first sand storage chamber 101 and a second sand storage chamber 102. The first sand storage chamber 101 and the second sand storage chamber 102 can be used to store two different types of sand. The first sand storage chamber 101 and the second sand storage chamber 102 are separated by a middle partition 100. The first sand storage chamber 101 is provided with a first sand inlet 1011 and a first sand outlet 1012, and the second sand storage chamber 102 is provided with a second sand inlet 1021 and a second sand outlet 1022.

[0037] The sand adding device is configured as a sand adding hopper 2, and the discharge port of the sand adding hopper 2 can be selectively aligned with the first sand inlet 1011 and the second sand inlet 1021. If the first sand storage chamber 101 needs to be added with sand, the sand adding hopper 2 filled with sand is aligned with the first sand inlet 1011. Of course, if the second sand storage chamber 102 needs to be added with sand, the sand adding hopper 2 filled with sand is aligned with the second sand inlet 1021.

[0038] The conveying device includes two lifting augers for conveying sand in the sand storage device, the lifting augers and the sand storage chambers are arranged one by one, and the sand mixing device is a sand mixer 4, and the maximum sand mixing amount of the sand mixer 4 is 30kg each time. The lifting augers are driven by a reduction motor.

[0039] The sand outlet is fixedly connected to the lower end of the lifting auger, and the upper end of the lifting auger is connected to the sand mixer 4, and the sand mixer 4 is connected to the temporary storage hopper 5 for mixing sand. The two lifting augers are respectively the first lifting augers 301 and the second lifting augers 302. The first sand outlet 1012 of the first sand storage chamber 101 is connected to the lower end of the first lifting augers 301, and the upper end of the first lifting augers 301 is connected to the sand mixer 4. The second sand outlet 1022 of the second sand storage chamber 102 is connected to the lower end of the second lifting augers 302, and the upper end of the second lifting augers 302 is connected to the sand mixer 4. The first lifting augers 301 transports the sand in the first sand storage chamber 101 to the sand mixer 4, and the second lifting augers 302 transports the sand in the second sand storage chamber 102 to the sand mixer 4.

[0040] The auxiliary material adding device is set as a weightless feeding device 6, and the accuracy of the weightless feeding device 6 reaches ±5‰. If flame retardant needs to be added, the flame retardant can be put into the weightless feeding device 6, and the weightless feeding device 6 transports the flame retardant to the sand mixer 4. The weightless feeding device 6 can accurately and quantitatively add flame retardant. Since the weight of the auxiliary material added can be accurately and quantitatively controlled, the ratio of the auxiliary material to the sand can be accurately controlled, the quality of the sand mixing can be ensured, the quality of the model printing is guaranteed, and the consistency of the model printing quality of different printing batches of the same product is ensured.

[0041] The sand mixing system of the 3D printing device includes a protective cover 9, which is located in front of the sand storage box 1 and surrounds the two lifting augers, the weightless feeding device 6 and the sand mixer 4 to protect these components.

[0042] like Figure 3 As shown, the first sand storage chamber 101 is provided with a first feeding warning material level detection switch 1013 and a first shutdown warning material level detection switch 1014, and the first feeding warning material level detection switch 1013 is located above the first shutdown warning material level detection switch 1014. The second sand storage chamber 102 is provided with a second feeding warning material level detection switch 1023 and a second shutdown warning material level detection switch 1024, and the second feeding warning material level detection switch 1023 is located above the second shutdown warning material level detection switch 1024. When the feeding warning material level detection switch detects that the sand level reaches this position, it warns that sand needs to be added to prevent insufficient sand in the sand storage chamber; when the shutdown warning material level detection switch detects that the sand level reaches this position, it warns the equipment to shut down, and the feeding warning material level detection switch and the shutdown warning material level detection switch are electrically connected to the whole machine control system and are controlled by the whole machine control system.

[0043] For example, when the first feeding warning material level detection switch 1013 on the first sand storage chamber 101 detects that the sand level has dropped to this position, an alarm is sounded to promptly remind the user to add sand to prevent the internal sand from being too little, thereby ensuring the normal operation of the equipment. When the first shutdown warning material level detection switch 1014 on the first sand storage chamber 101 detects that the sand level has dropped to this position, an alarm is sounded. If sand is not added in time, the equipment will shut down. Similarly, the second feeding warning material level detection switch 1023 and the second shutdown warning material level detection switch 1024 on the second sand storage chamber 102 have the same working principle, which will not be described in detail here.

[0044] Both the feeding warning material level detection switch and the shutdown warning material level detection switch can adopt the paddle-rotor material level switch, which can be purchased on the market.

[0045] A pneumatic vibrator 7 is fixed on the outer wall of the sand storage box 1 , a pneumatic vibrator 7 is fixed on the outer wall of the first sand storage chamber 101 , and a pneumatic vibrator 7 is fixed on the outer wall of the second sand storage chamber 102 .

[0046] A material level detection switch 501 is provided on the temporary storage hopper 5 for detecting whether there is material in the temporary storage hopper 5. The material level detection switch 501 is electrically connected to the whole machine control system. A pneumatic vibrator 7 is fixed on the outer wall of the temporary storage hopper 5. The material level detection switch 501 can also be a pneumatic level switch.

[0047] The temporary storage hopper 5 for mixing sand is located obliquely below the sand mixer 4. The side wall of the sand mixer 4 is provided with a mixed sand discharge port. The top of the temporary storage hopper 5 is provided with a mixed sand receiving port. The mixed sand discharge port and the mixed sand receiving port are fixedly connected through a transition shell 8. The temporary storage hopper 5 for mixing sand can temporarily store the mixed sand volume of the sand mixer 4 twice to ensure the sand demand of the sand mold 3D printing equipment.

[0048] In some embodiments, Figure 1 As shown, the first sand inlet 1011 and the second sand inlet 1021 are adjacently opened on the top of the sand storage box 1, and a support and limit plate 103 for placing the sand hopper 2 is fixed on the top of the sand storage box 1 near the first sand inlet 1011 and the second sand inlet 1021. In this embodiment, a total of 6 support and limit plates 103 are arranged on the top of the sand storage box 1, of which 4 support and limit plates 103 are respectively arranged at the 4 corners of the top of the sand storage box 1, and 2 support and limit plates 103 are arranged at the middle position of the top of the sand storage box 1 and close to both sides.

[0049] A gate valve is provided at the bottom of the sand adding hopper 2, and the gate valve controls the opening or closing of the discharge port of the sand adding hopper 2. The gate valve is convenient for rapid sand addition.

[0050] The specific working principle of the sand mixing system of 3D printing equipment is:

[0051] The two sand storage chambers of the sand storage box 1 can be used to store new sand and old sand respectively. For example, the first sand storage chamber 101 is used to store new sand, and the second sand storage chamber 102 is used to store old sand. When adding sand, sand is manually loaded into the sand adding hopper 2, and then the sand adding hopper 2 is placed on the top of the sand storage box 1 by a forklift, and the discharge port of the sand adding hopper 2 is aligned with the first sand inlet 1011 or the second sand inlet 1021. The sand storage chamber that needs to be added with sand is aligned with the corresponding sand inlet. The gate valve at the bottom of the sand adding hopper 2 is opened to allow the sand to fall into the sand storage chamber below that needs to be added with sand. After the sand is added, the sand storage chamber to be used for printing can be set in the whole machine control system as needed, that is, the new sand in the first sand storage chamber 101 can be selected, or the old sand in the second sand storage chamber 102 can be selected, or the sand in both sand storage chambers can be selected at the same time. At the same time, the weight of each sand mixing, the amount of curing agent added, and the amount of flame retardant added can be set in the whole machine control system. After the parameters are set, automatic operation can be selected, and the sand mixing system of the 3D printing equipment starts working.

[0052] If new sand is used for this printing, the material level detection switch 501 detects that there is no material in the temporary storage hopper 5 for mixing sand, and the first lifting auger 301 transports the new sand in the first sand storage chamber 101 to the sand mixer 4. If flame retardant needs to be added for this printing, the auxiliary material adding device will also be started synchronously to add the flame retardant to the sand mixer 4. After reaching the set addition amount, the sand mixer 4 is started, and the curing agent will also be quantitatively dripped into the sand mixer 4 through the pipeline (omitted in the figure). After the sand mixing is completed, the sand mixer 4 will discharge the mixed sand into the temporary storage hopper 5 for mixing sand, and then the sand mold 3D printing equipment will suck it away from the temporary storage hopper 5 for mixing sand through the vacuum suction machine. When the first lifting auger 301 or the second lifting auger 302 is working, the pneumatic vibrator 7 on the corresponding sand storage chamber will also work synchronously to improve the fluidity of the sand.

[0053] During the entire operation process, if the sand in the sand storage chamber is lower than the material adding warning level detection switch, the equipment will alarm to remind the equipment operator to add sand. If the sand is not added and it continues to be used, the sand level in the sand storage chamber will continue to drop. When the sand level drops to the position of the shutdown warning level detection switch, an alarm will be issued. If no sand is added, the sand level is lower than the shutdown warning level detection switch, and the equipment will stop. The auxiliary material adding device is a weightless type, so when the weight of the flame retardant in the weightless feeding device 6 is lower than the set weight, it will also remind the alarm.

[0054] The sand mixing system of the 3D printing equipment of the present invention can achieve the mixing of sand for the sand mold 3D printing equipment through simple operation, and can accurately and quantitatively add flame retardants. The equipment has a high degree of automation, and the sand mixing time is significantly shortened, which significantly saves manpower, reduces the labor intensity of manual labor, reduces the manpower production cost of the enterprise, and improves production efficiency. In addition, the two types of sand can be quickly switched during the printing process, which can improve the intelligence and production efficiency of the 3D printing equipment.

[0055] The present invention is not limited to the above embodiments, and all improvements made based on the concept, principle, structure and method of the present invention are within the protection scope of the present invention.

Claims

1. A sand mixing system for a 3D printing device, comprising a sand adding device, a sand storage device, an auxiliary material adding device, a conveying device, a sand mixing device and a temporary storage hopper for mixed sand, wherein the sand adding device adds sand into the sand storage device, the conveying device conveys the sand in the sand storage device to the sand mixing device, the auxiliary material adding device adds auxiliary materials to the sand mixing device, and the mixed sand material in the sand mixing device enters the temporary storage hopper for mixed sand, characterized in that: The sand mixing system of the 3D printing equipment includes a whole machine control system, The sand storage device is configured as a sand storage box, the sand storage box includes two sand storage chambers, each of the sand storage chambers is provided with a sand inlet and a sand outlet, the sand adding device is configured as a sand adding hopper, the discharge port of the sand adding hopper can be selectively aligned with one of the sand inlets, the conveying device includes two lifting augers for conveying sand in the sand storage device, the lifting augers and the sand storage chambers are provided in one-to-one correspondence, The sand mixing device is configured as a sand mixer, the sand outlet is fixedly connected to the lower end of the lifting auger, the higher end of the lifting auger is connected to the sand mixer, and the sand mixer is connected to the temporary storage hopper for mixing sand.

2. A sand mixing system for a 3D printing device as claimed in claim 1, characterized in that: The auxiliary material adding device is configured as a loss-in-weight feeding device, and the accuracy of the loss-in-weight feeding device is ±5‰.

3. A sand mixing system for a 3D printing device as claimed in claim 1, characterized in that: The two sand storage chambers are both provided with a feeding warning material level detection switch and a shutdown warning material level detection switch. The feeding warning material level detection switch is located above the shutdown warning material level detection switch. When the feeding warning material level detection switch detects that the sand level has reached this position, it warns that sand needs to be added; when the shutdown warning material level detection switch detects that the sand level has reached this position, it warns the equipment to shut down. The feeding warning material level detection switch and the shutdown warning material level detection switch are electrically connected to the whole machine control system.

4. A sand mixing system for 3D printing equipment according to claim 1, characterized in that: A pneumatic vibrator is fixed on the outer side wall of the sand storage box.

5. A sand mixing system for 3D printing equipment according to claim 1, characterized in that: The sand mixing temporary storage hopper is provided with a material level detection switch, and the material level detection switch is used to detect whether there is material in the sand mixing temporary storage hopper, and the material level detection switch is electrically connected to the whole machine control system.

6. A sand mixing system for 3D printing equipment according to claim 1, characterized in that: The temporary sand mixing hopper is located obliquely below the sand mixer, the side wall of the sand mixer is provided with a sand mixing outlet, the top of the temporary sand mixing hopper is provided with a sand mixing receiving port, and the sand mixing outlet is fixedly connected with the sand mixing receiving port through a transition shell.

7. A sand mixing system for 3D printing equipment according to claim 1, characterized in that: The two sand inlets are adjacently opened on the top of the sand storage box, and a support and limiting plate for placing the sand adding hopper is fixed on the top of the sand storage box near each of the sand inlets.

8. A sand mixing system for 3D printing equipment according to claim 7, characterized in that: A gate valve is arranged at the bottom of the sand adding hopper, and the gate valve controls the opening or closing of the discharge port of the sand adding hopper.

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