An automatic wax injection machine for lost wax casting

Abstract

The present invention relates to the technical field of lost wax casting, and specifically provides an automatic wax injection machine for lost wax casting, comprising a frame, on which an injection head is arranged, the injection head having an inner and outer layer, the end faces at both ends of the inner layer of the injection head are respectively provided with a feed port and a discharge port, by arranging the inner and outer layers of the injection head, the cavity between the inner and outer layers is divided into a first cavity and a second cavity, the temperature of the first cavity is higher than the temperature of the second cavity, so that during wax injection, part of the wax liquid flows back to the feed port through the first cavity and the second cavity, and a viscosity sensor and an adjustment component are arranged at the feed port, so as to ensure that the viscosity of the wax liquid is maintained at a preset viscosity, reduce the fluctuation of the wax liquid viscosity, and improve the viscosity consistency of the wax liquid at different times.

Description

Technical Field

[0001] The invention relates to the technical field of lost wax casting, in particular to an automatic wax injection machine for lost wax casting. Background Art

[0002] Lost wax casting, also known as investment casting, is a precision casting process used to create metal parts with complex shapes and high precision. This method is widely used in many industries, including aerospace, automotive, medical devices and art manufacturing. The equipment used includes wax injection machines, wax pattern trimming equipment and slurry dipping equipment. Wax injection machines are specially designed to accurately inject wax into the molding container.

[0003] When an existing wax injection machine injects wax liquid into a molding container, the fluidity and viscosity of the wax liquid at different times will vary due to the uneven heating of the wax box. In addition, in the early stage of injection into the molding container, there is no pressure in the molding container, but in the later stage of injection, there is pressure in the molding container. The pressure fluctuation will cause different wax liquid flow speeds throughout the injection process, thereby affecting the flow path of the wax liquid, which will reduce the molding quality of the wax mold. Summary of the invention

[0004] Based on this, it is necessary to provide an automated wax injection machine for lost wax casting to address the problem that the fluidity and viscosity of the wax liquid at different times are different due to uneven heating of the wax liquid.

[0005] The above purpose is achieved through the following technical solutions:

[0006] An automatic wax injection machine for lost wax casting, comprising:

[0007] A frame, wherein an injection head is arranged on the frame, wherein the injection head has an inner and outer layer, wherein a feed port and a discharge port are respectively provided on both end surfaces of the inner layer, wherein the cavity between the inner and outer layers is axially divided into a conveying cavity and a heating cavity, wherein the conveying cavity is connected to a position of the inner layer close to the discharge port, wherein the heating cavity is circumferentially divided into a first cavity and a second cavity, wherein the first cavity and the second cavity are respectively connected to a position of the inner layer close to the feed port, wherein the temperature in the first cavity is higher than the temperature in the second cavity, and when the wax liquid is squeezed out from the discharge port, part of the wax liquid passes through the conveying cavity into the first cavity and the second cavity and flows back to the feed port;

[0008] A conveying assembly, the conveying assembly is used to convey the wax liquid from the feed inlet to the discharge outlet;

[0009] A viscosity sensor, the viscosity sensor is arranged at the feed inlet, and the viscosity sensor is used to sense the viscosity of the wax liquid entering the feed inlet;

[0010] A regulating component, the regulating component is used to regulate the flow rate of the wax liquid flowing back to the feed port through the first cavity and the second cavity;

[0011] The regulating component is configured to increase the flow rate of the wax liquid returning to the feed port through the second cavity when the viscosity of the feed port is lower than the preset viscosity, and to increase the flow rate of the wax liquid returning to the feed port through the first cavity when the viscosity of the feed port is higher than the preset viscosity.

[0012] Furthermore, the adjustment component includes a hydraulic control box and a telescopic plate. A first reflux groove and a second reflux groove are provided on the side wall of the inner layer near the feed port. The first reflux groove connects the first cavity and the inner layer, and the second reflux groove connects the second cavity and the inner layer. The telescopic plates are slidably inserted on the side walls of the first reflux groove and the second reflux groove, respectively. The hydraulic control box controls the telescopic plate to extend and retract to change the opening size of the first reflux groove and the second reflux groove, respectively. The flow rate of the wax liquid returning to the feed port through the first cavity or the second cavity is positively correlated with the size of the opening of the first reflux groove or the second reflux groove.

[0013] Furthermore, the conveying assembly includes a conveying auger and a driving motor. The conveying auger is rotatably arranged in the inner layer. The blade edge of the conveying auger is in sliding contact with the inner wall of the inner layer. The driving motor drives the conveying auger to rotate to convey the wax liquid.

[0014] Furthermore, the inner layer is also provided with a stirring assembly, which includes a plurality of fixed stirring rods and a plurality of rotating stirring rods. The plurality of rotating stirring rods are fixedly arranged on the auger shaft of the conveying auger and are all distributed radially along the auger shaft. The plurality of fixed stirring rods are fixedly arranged on the inner wall of the inner layer and are staggered with the rotating stirring rods.

[0015] Furthermore, the lengths of the plurality of fixed stirring rods and the lengths of the plurality of rotating stirring rods are the same and the lengths are both the distances between the auger shaft and the inner wall of the inner layer.

[0016] Furthermore, a first heater is disposed in the first cavity, and a second heater is disposed in the second cavity, and the power of the first heater is greater than the power of the second heater.

[0017] Further, an adjusting ring sleeve is rotatably provided on the end surface of the inner layer near the discharge port, a first adjusting groove is provided on the end surface of the adjusting ring sleeve near the discharge port, a second adjusting groove is provided on the outer peripheral wall of the adjusting ring sleeve, a connecting groove is provided on the side wall of the inner layer near the discharge port, the first adjusting groove cooperates with the discharge port, and the second adjusting groove cooperates with the connecting groove;

[0018] The adjustment ring sleeve is configured such that when the first adjustment groove completely overlaps with the discharge port, the second adjustment groove overlaps with the connecting groove at a minimum; when the first adjustment groove does not overlap with the discharge port, the second adjustment groove completely overlaps with the connecting groove.

[0019] Furthermore, a first rotating motor is fixedly arranged on the inner layer, a rotating shaft of the first rotating motor is fixedly connected to the adjusting ring sleeve, and the first rotating motor drives the adjusting ring sleeve to rotate.

[0020] Furthermore, a conveying ring sleeve is rotatably arranged in the conveying cavity, and the conveying ring sleeve is used to convey the refluxed wax liquid. A spiral blade is fixedly arranged on the inner surface of the conveying ring sleeve, and the spiral blade is in sliding contact with the outer wall of the inner layer. The refluxed wax liquid contacts the spiral blade, and the conveying ring sleeve rotates to convey the wax liquid.

[0021] Furthermore, a second rotating motor is arranged on the outer wall of the outer layer, a gear ring is arranged on the outer peripheral wall of the conveying ring sleeve, a gear of the second rotating motor passes through the outer wall and meshes with the gear ring, and the second rotating motor drives the conveying ring sleeve to rotate.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides an inner and outer two-layer injection head, and the cavity between the inner and outer layers is divided into a first cavity and a second cavity. The temperature of the first cavity is higher than the temperature of the second cavity, so that when the wax is injected, part of the wax liquid flows back to the feed port through the first cavity and the second cavity, and a viscosity sensor and an adjustment component are provided at the feed port to ensure that the viscosity of the wax liquid is maintained at a preset viscosity, reduce the fluctuation of the wax liquid viscosity, and improve the viscosity consistency of the wax liquid at different times.

[0024] By setting the delivery mode of the delivery auger, the wax liquid injection pressure can be controlled to be constant, and the injection speed will not be affected by the change of the wax liquid volume in the molding container chamber, thereby maintaining the stability of the wax liquid flow in the injection head and improving the quality of wax mold molding.

[0025] The present invention provides an injection head with two inner and outer layers, and an adjusting ring sleeve is rotatably provided on the end surface at the discharge port. The adjusting ring sleeve rotates to adjust the opening size of the discharge port and the connecting groove, so that when the wax injection is stopped, the wax liquid inside the injection head circulates through the connecting groove, maintaining the self-circulating flow of the wax liquid in the injection head and avoiding solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of an automated wax injection machine for lost wax casting provided by one embodiment of the present invention;

[0027] Figure 2A schematic diagram of the structure of an injection head of an automated wax injection machine for lost wax casting provided by one embodiment of the present invention;

[0028] Figure 3 An exploded view of an injection head of an automated wax injection machine for lost wax casting provided by one embodiment of the present invention;

[0029] Figure 4 for Figure 2 A right view of an injection head of an automated wax injection machine for lost wax casting provided in one embodiment;

[0030] Figure 5 for Figure 4 A cross-sectional view of an injection head of an automated wax injection machine for lost wax casting provided in one embodiment along AA;

[0031] Figure 6 for Figure 5 An enlarged view of the injection head X portion of an automated wax injection machine for lost wax casting provided in one embodiment;

[0032] Figure 7 for Figure 4 A cross-sectional view of an injection head of an automated wax injection machine for lost wax casting provided in one embodiment along line BB;

[0033] Figure 8 for Figure 7 An enlarged view of the injection head Y portion of the automated wax injection machine for lost wax casting provided in one embodiment;

[0034] Fig. 9 for Figure 5 A cross-sectional view of an injection head of an automated wax injection machine for lost wax casting provided in one embodiment along CC;

[0035] Fig.10 for Fig. 9 An enlarged view of the injection head Z portion of an automated wax injection machine for lost wax casting provided in one embodiment;

[0036] Fig.11 A schematic diagram of the structure of the inner and outer sides of the injection head of an automated wax injection machine for lost wax casting provided by one embodiment of the present invention;

[0037] Fig.12 A schematic diagram of the mechanism of a conveying assembly of an injection head of an automated wax injection machine for lost wax casting provided by an embodiment of the present invention;

[0038] Fig.13 A schematic diagram of the structure of a conveying ring sleeve of an injection head of an automated wax injection machine for lost wax casting provided by one embodiment of the present invention;

[0039] Fig.14 A schematic structural diagram of a connecting frame of an injection head of an automated wax injection machine for lost wax casting provided by an embodiment of the present invention;

[0040] Fig.15 A schematic structural diagram of an adjustment ring sleeve of an injection head of an automated wax injection machine for lost wax casting provided in one embodiment of the present invention.

[0041] in:

[0042] 100, rack;

[0043] 200, injection head; 210, inner layer; 211, feed port; 212, discharge port; 213, connecting groove; 214, first reflux groove; 215, second reflux groove; 216, sealing channel; 217, limiting ring groove; 220, outer layer; 230, viscosity sensor;

[0044] 300, connecting frame; 310, annular baffle; 320, baffle bar; 330, heating rod;

[0045] 400, adjustment assembly; 410, hydraulic control box; 411, hydraulic pipe; 420, telescopic plate;

[0046] 500, conveying assembly; 510, conveying auger; 520, driving motor; 530, transmission ring; 531, connecting rod;

[0047] 600, stirring assembly; 610, fixed stirring rod; 620, rotating stirring rod;

[0048] 700, adjusting ring sleeve; 710, first adjusting slot; 720, second adjusting slot; 730, first rotating motor; 731, motor mounting slot;

[0049] 800, conveying ring sleeve; 810, spiral blade; 820, gear ring; 830, second rotating motor. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 to the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] Refer to the following Figure 1-Figure 15 To describe an automatic wax injection machine for lost wax casting provided by the present invention.

[0054] An automatic wax injection machine for lost wax casting comprises a frame 100, on which an injection head 200 is arranged, and the injection head 200 is used to inject wax liquid into a molding container. The injection head 200 has an inner and outer layer, and two end surfaces of the inner layer 210 are respectively provided with a feed port 211 and a discharge port 212. The wax liquid enters the injection head 200 from the feed port 211 and is then squeezed out from the discharge port 212, thereby injecting the wax liquid into the molding container. There is a cavity between the inner and outer layers of the injection head 200, and an annular baffle 310 is arranged in the cavity. The annular baffle 310 divides the cavity into an axially distributed conveying cavity and a heating cavity. The annular baffle 310 is provided with a plurality of through holes, and the annular baffle 310 does not block the wax liquid from passing through. Two baffles 320 are arranged in the heating cavity, and the two baffles 320 are symmetrically arranged in the heating cavity and distributed along the axial direction, thereby dividing the heating cavity into a first cavity and a second cavity, and the wax liquid cannot pass through the two baffles 320.

[0055] To facilitate the installation of the baffle 320 and the annular baffle 310, a connecting frame 300 is provided in the heating chamber. The connecting frame 300 is fixedly provided on the outer wall of the inner layer 210 of the injection head 200. The annular baffle 310 is fixedly provided on the end surface of the connecting frame 300 close to the conveying chamber. The two baffles 320 are symmetrically provided in the heating chamber through the connecting frame 300 and distributed along the axial direction.

[0056] A conveying component 500 is arranged in the cavity of the inner layer 210, and the conveying component 500 conveys the wax liquid entering from the feed port 211 to the discharge port 212. A viscosity sensor 230 is arranged at the feed port 211, and the viscosity sensor 230 is used to sense the viscosity of the wax liquid entering the feed port 211. Under ideal conditions, the viscosity of the wax liquid should maintain a preset viscosity (the preset viscosity is the optimal viscosity required for wax injection, and the preset viscosity can be adjusted according to demand, and is not specifically limited here), so that the wax liquid is smoother during the conveying process and the wax liquid is extruded more evenly, which helps to improve the quality of the wax model. However, before the wax liquid enters the feed port 211, due to various uncertain factors, the viscosity of the wax liquid entering the feed port 211 fluctuates, affecting the uniformity of the wax liquid delivery. The viscosity sensor 230 can sense the viscosity change of the wax liquid, and then make adjustments based on the sensed viscosity, so that the viscosity of the wax liquid passing through the feed port 211 tends to the preset viscosity, thereby reducing the fluctuation of the wax liquid viscosity.

[0057] It should be noted that the viscosity sensor 230 may be a rotary viscosity sensor 230, which measures viscosity through a rotating component immersed in liquid. The rotating component is subject to resistance from the liquid, and the greater the resistance, the higher the viscosity of the liquid. It may also be a vibration viscosity sensor 230, which measures viscosity by utilizing the damping effect of the vibrating body in the liquid. It may also be a capillary viscosity sensor 230, which measures the flow rate and pressure drop of the fluid in the pipeline through a capillary tube to calculate the viscosity. It may also be other components that can detect the viscosity of the wax liquid, which is not specifically limited here.

[0058] The conveying cavity is connected to the cavity of the inner layer 210 near the discharge port 212, and the first cavity and the second cavity are respectively connected to the cavity of the inner layer 210 near the feed port 211, so that in the process of the wax liquid entering from the feed port 211 to being discharged from the discharge port 212, a part of the wax liquid will flow back into the feed port 211 through the conveying cavity, the first cavity and the second cavity. The temperatures in the first cavity and the second cavity of the present invention are different, and the temperature of the first cavity is higher than the temperature of the second cavity, so the viscosity of the wax liquid passing through the first cavity and the second cavity will change.

[0059] Since the viscosity of the wax liquid is greatly affected by temperature, the temperature in the first cavity is higher, and the viscosity of the wax liquid passing through the first cavity will decrease, while the temperature in the second cavity is lower than the temperature in the first cavity, and the viscosity of the wax liquid passing through the second cavity will increase. When the wax liquid flow rates returning from the first cavity and the second cavity to the feed port 211 are set to be the same, the viscosity of the original wax liquid is not changed. If the viscosity sensor 230 senses that the viscosity of the wax liquid at the feed port 211 has changed, the viscosity of the wax liquid is adjusted by setting the adjustment component 400 to adjust the flow rate returning from the first cavity or the second cavity to the feed port 211.

[0060] For example, when the viscosity sensor 230 senses that the viscosity of the feed port 211 is lower than the preset viscosity, the adjustment component 400 increases the flow rate of the second cavity backflowing to the feed port 211, while the flow rate of the first cavity backflowing to the feed port 211 remains unchanged or even decreases, so that the wax liquid with high viscosity is neutralized with the wax liquid with lower viscosity than the preset viscosity, thereby increasing the viscosity of the wax liquid and making the viscosity of the wax liquid tend to the preset viscosity; when the viscosity sensor 230 senses that the viscosity of the feed port 211 is higher than the preset viscosity, the adjustment component 400 increases the flow rate of the first cavity backflowing to the feed port 211, while the flow rate of the second cavity backflowing to the feed port 211 remains unchanged or even decreases, so that the wax liquid with low viscosity is neutralized with the wax liquid with higher viscosity than the preset viscosity, thereby reducing the viscosity of the wax liquid and making the viscosity of the wax liquid tend to the preset viscosity.

[0061] Specifically, the adjustment component 400 includes a hydraulic control box 410 and a telescopic plate 420. The hydraulic control box 410 is arranged on the outer layer 220 of the injection head 200, and the telescopic plate 420 is arranged at a position where the first cavity and the second cavity are connected to the cavity of the inner layer 210. A first reflux groove 214 is opened at a position near the feed port 211 on the side wall of the first cavity and the inner layer 210, and a second reflux groove 215 is opened at a position near the feed port 211 on the side wall of the second cavity and the inner layer 210, and the telescopic plate 420 The telescopic plate 420 is slidingly arranged on the side walls of the first reflow groove 214 and the second reflow groove 215, and is equivalent to a switch on the first reflow groove 214 and the second reflow groove 215. When the telescopic plate 420 slides and extends to the longest, it can completely cover the first reflow groove 214 or the second reflow groove 215. When the telescopic plate 420 slides and retracts, it can change the opening size of the first reflow groove 214 or the second reflow groove 215, thereby adjusting the wax liquid flow rate that flows back to the discharge port 212 through the first cavity or the second cavity.

[0062] It can be understood that when the opening of the first reflow groove 214 or the second reflow groove 215 is larger, the wax liquid flow rate passing through the first reflow groove 214 or the second reflow groove 215 is larger; when the opening of the first reflow groove 214 or the second reflow groove 215 is smaller, the flow rate passing through the first reflow groove 214 or the second reflow groove 215 is smaller.

[0063] To facilitate connection, two hydraulic pipes 411 are connected to the hydraulic control box 410, and the two hydraulic pipes 411 are respectively connected to the sliding and retracting positions of the two telescopic plates 420. To facilitate the connection of the telescopic plates 420, sealed channels 216 are opened on the side walls of the first reflux groove 214 and the second reflux groove 215, that is, the two hydraulic pipes 411 connect the two sealed channels 216, and the inside of the sealed channels 216 is filled with hydraulic oil. The hydraulic control box 410 controls the output of the hydraulic oil in the two hydraulic pipes 411 respectively, thereby respectively adjusting the positions of the two telescopic plates 420 in the first reflux groove 214 and the second reflux groove 215.

[0064] Specifically, the conveying assembly 500 of the present invention includes a conveying auger 510 and a driving motor 520. The conveying auger 510 is rotatably arranged in the inner layer 210 of the injection head 200. The blade edge of the conveying auger 510 is in sliding contact with the inner wall of the inner layer 210 of the injection head 200. For the convenience of connection, a limiting ring groove 217 is arranged in the inner layer 210 of the injection head 200. A transmission ring 530 is arranged on the auger shaft of the conveying auger 510. The transmission ring 530 is fixed on the auger shaft through a plurality of connecting rods 531, and the transmission ring 530 is located in the limiting ring groove 217. The two end faces of the transmission ring 530 are in contact with the limiting ring groove 217. The two side walls of the annular groove 217 are slidingly sealed to prevent the wax liquid from penetrating into the limiting annular groove 217. Teeth are arranged on the outer periphery of the transmission ring 530. The driving motor 520 is fixedly arranged on the outer layer 220 of the injection head 200. There is a notch on the limiting annular groove 217. The gear of the driving motor 520 engages with the transmission ring 530 in the limiting annular groove 217 through the notch. The driving motor 520 rotates to drive the transmission ring 530 to rotate. The transmission ring 530 drives the conveying auger 510 to rotate. When the conveying auger 510 rotates, the wax liquid entering from the feed port 211 is transported to the discharge port 212 for extrusion.

[0065] By using the delivery method of the delivery auger 510 to deliver the wax liquid, the wax liquid injection pressure can be controlled to be constant, and the injection speed will not be affected by the change of the wax liquid volume in the molding container chamber. The stability of the wax liquid flow in the injection head 200 is maintained, and the quality of wax mold molding is improved.

[0066] In a further embodiment, a stirring assembly 600 is further provided inside the injection head 200, and the stirring assembly 600 is used to stir the wax liquid being transported. The stirring assembly 600 includes a plurality of fixed stirring rods 610 and a plurality of rotating stirring rods 620, and the plurality of rotating stirring rods 620 are fixedly arranged on the auger shaft of the conveying auger 510. The blades of the conveying auger 510 have two parts, and the two parts are respectively located on both sides of the auger shaft. The middle part of the auger shaft has no blades but is fixedly provided with a plurality of rotating stirring rods 620, and the plurality of rotating stirring rods 620 are evenly distributed on the auger shaft. The plurality of fixed stirring rods 610 are fixedly arranged on the inner wall of the inner layer 210 of the injection head 200 and are also distributed radially along the auger shaft and are staggered with the plurality of rotating stirring rods 620. When the conveying auger 510 rotates, the plurality of rotating stirring rods 620 rotate to stir the wax liquid to prevent different components in the wax liquid (such as solid particles, additives or wax components with different melting points) from stratifying or precipitating, thereby ensuring that the entire wax liquid remains in a uniform state, and can also avoid aggregation of certain components to ensure consistency in the quality of the finished product.

[0067] In a further embodiment, the lengths of the several fixed stirring rods 610 and the several rotating stirring rods 620 of the present invention are the same, and the lengths are all the distances from the auger shaft to the inner wall of the inner layer 210 of the injection head 200. Setting this length can increase the stirring range and achieve a better stirring effect.

[0068] It should be noted that the stirring component 600 is not limited to the above structure, but can also be other structures, such as a stirring mechanism such as a stirring paddle that rotates in the opposite direction, which can achieve the function of stirring the wax liquid, and no specific limitation is made here.

[0069] Specifically, the temperature of the first cavity is higher than the temperature of the second cavity by setting a first heater in the first cavity and a second heater in the second cavity, and the power of the first heater is greater than the power of the second heater. The high temperature in the first cavity reduces the viscosity of the wax liquid passing through the first cavity, and the temperature of the cavity is lower than the temperature of the first cavity, which increases the viscosity of the wax liquid passing through the second cavity.

[0070] Specifically, in an embodiment of the present invention, the first heater and the second heater are both heating rods 330, and the heating rods 330 are evenly arranged in the first cavity and the second cavity, and the power of the heating rod 330 in the first cavity is greater than the power of the heating rod 330 in the second cavity. In order to facilitate uniform heating of the heating rods 330, a plurality of heating rods 330 are fixed on the connecting frame 300, and the heating rods 330 are arranged along the axial direction of the connecting frame 300 and are evenly arranged along the circumferential direction to ensure that the wax liquid can be evenly heated.

[0071] In a further embodiment, an adjustment ring sleeve 700 is rotatably provided on the end surface of the inner layer 210 of the injection head 200 of the present invention near the discharge port 212, the axis of the adjustment ring sleeve 700 coincides with the axis of the inner layer 210 of the injection head 200, the adjustment ring sleeve 700 has an end surface and an annular side wall, a first adjustment groove 710 is provided on the end surface of the adjustment ring sleeve 700, the first adjustment groove 710 corresponds to the discharge port 212, and the size of the first adjustment groove 710 is the same as the size of the discharge port 212, when the adjustment ring sleeve 700 rotates around its own axis, the first adjustment groove 710 and the discharge port 212 are staggered, so that the discharge port 212 is The opening size of the outlet 212 changes; a second adjusting groove 720 is provided on the side wall of the adjusting ring sleeve 700, and a connecting groove 213 is provided on the side wall of the inner layer 210 of the injection head 200 near the discharge port 212, the connecting groove 213 connects the cavity of the inner layer 210 and the conveying cavity between the inner and outer layers of the injection head 200, the second adjusting groove 720 corresponds to the connecting groove 213, the second adjusting groove 720 and the connecting groove 213 have the same size, when the adjusting ring sleeve 700 rotates, the second adjusting groove 720 and the connecting groove 213 can also be staggered to adjust the opening size of the connecting groove 213, the specific configuration of the adjusting ring sleeve 700 is as follows:

[0072] When the first adjustment groove 710 completely overlaps with the discharge port 212, the opening of the discharge port 212 is the largest, and at this time, the second adjustment groove 720 overlaps with the connecting groove 213 to the smallest extent, that is, the opening of the connecting groove 213 is the smallest. When the adjustment ring sleeve 700 rotates, the first adjustment groove 710 and the discharge port 212 are staggered, the opening of the discharge port 212 gradually decreases, and the overlap of the second adjustment groove 720 and the connecting groove 213 gradually increases, and the opening of the connecting groove 213 gradually increases, until the opening of the connecting groove 213 is the largest, that is, when the second adjustment groove 720 completely overlaps with the connecting groove 213, the first adjustment groove 710 blocks the discharge port 212. Therefore, the opening sizes of the discharge port 212 and the connecting groove 213 can be adjusted by rotating the adjustment ring sleeve 700.

[0073] It should be noted that when the first regulating groove 710 and the discharge port 212 are completely overlapped, the opening of the connecting groove 213 is very small. When the wax liquid is transported through the conveying auger 510, most of the wax liquid is squeezed out through the discharge port 212, and a small amount of wax liquid enters the conveying cavity through the connecting groove 213. The wax liquid is transported into the first cavity and the second cavity in the conveying cavity, respectively, and then flows back to the feed port 211 after being heated by the first heater and the second heater. The opening sizes of the first reflux groove 214 and the second reflux groove 215 are adjusted according to the viscosity sensor 230 so that the viscosity of the wax liquid tends to the preset viscosity. When it is necessary to stop wax injection (stop wax injection to replace the molding container intermittent time, when a molding container needs to be replaced with a new molding container after wax injection, so wax injection needs to be stopped during the replacement of the molding container), turn the adjusting ring sleeve 7 00, so that the first regulating groove 710 and the discharge port 212 no longer overlap, that is, the discharge port 212 is closed, thereby stopping the wax injection. When the discharge port 212 is closed, the second regulating groove 720 and the connecting groove 213 completely overlap, so that the opening of the connecting groove 213 is maximized. At this time, the conveying auger 510 does not stop, and still conveys the wax liquid, but the feed port 211 no longer inputs the wax liquid. The wax liquid conveyed by the conveying auger 510 enters the conveying cavity through the connecting groove 213, and then flows back to the discharge port 212 through the first cavity and the second cavity. Therefore, during the interval of stopping the wax injection, the wax liquid in the injection head 200 is still in a flowing state, thereby avoiding the change in viscosity caused by the cessation of the flow of the wax liquid. At the same time, the viscosity sensor 230 on the discharge port 212 is still working, thereby ensuring that the viscosity of the wax liquid always maintains the preset viscosity.

[0074] Specifically, in the embodiment of the present invention, there are multiple discharge ports 212, first adjustment grooves 710, second adjustment grooves 720 and connecting grooves 213, wherein there are four discharge ports 212 and four first adjustment grooves 710, and there are four connecting grooves 213 and four second adjustment grooves 720.

[0075] More specifically, a first rotating motor 730 is arranged on the end surface of the inner layer 210 close to the discharge port 212, and the rotating shaft of the first rotating motor 730 is fixedly connected to the adjusting ring sleeve 700. The first rotating motor 730 rotates to drive the adjusting ring sleeve 700 to rotate. To facilitate the fixation of the first rotating motor 730, a motor mounting groove 731 is arranged on the end surface of the inner layer 210 close to the discharge port 212, and the first rotating motor 730 is fixedly installed in the motor mounting groove 731.

[0076] In a further embodiment, a conveying sleeve 800 is provided in the conveying cavity between the inner and outer layers 220 of the injection head 200. The conveying sleeve 800 is rotatably sleeved on the wall of the inner layer 210. A spiral blade 810 (with a function similar to that of a spiral auger) is provided on the inner wall of the conveying sleeve 800. The spiral blade 810 is in sliding contact with the outer wall of the inner layer 210. The wax liquid entering the conveying cavity through the connecting groove 213 contacts the spiral blade 810. The direction in which the wax liquid is conveyed by the conveying sleeve 800 is opposite to the conveying direction of the conveying auger 510. The rotating sleeve drives the spiral blade 810 to rotate to convey the wax liquid to the first cavity and the second cavity. Through the conveying of the conveying sleeve 800, the reflux of the wax liquid is smoother.

[0077] Specifically, in an embodiment of the present invention, a second rotating motor 830 is arranged on the outer wall of the outer layer 220 of the injection head 200, and the second rotating motor 830 is used to drive the conveying ring sleeve 800 to rotate. A gear ring 820 is arranged on the outer periphery of the conveying ring sleeve 800, and an engaging groove is opened on the side wall of the outer layer 220. The gear of the second rotating motor 830 is located in the engaging groove and meshes with the gear ring 820, so that when the gear of the second rotating motor 830 rotates, it drives the conveying ring sleeve 800 to rotate to complete the delivery of the wax liquid.

[0078] The specific working process of an automatic wax injection machine for lost wax casting provided by the present invention is described in combination with the above embodiments:

[0079] After adjusting the temperatures of the first heater and the second heater, adjust the hydraulic control box 410, control the telescopic lengths of the telescopic plate 420 to be the same so that the opening sizes of the first reflux groove 214 and the second reflux groove 215 are the same, start the drive motor 520, the first rotating motor 730 and the second rotating motor 830, and rotate the adjustment ring sleeve 700 to make the discharge port 212 completely overlap with the first adjustment groove 710, so that the opening of the discharge port 212 is maximized, and at this time, the overlapping part of the second adjustment groove 720 and the connecting groove 213 is minimized, and the opening of the connecting groove 213 is minimized.

[0080] The wax liquid is input from the feed port 211 into the cavity of the inner layer 210 of the injection head 200, and the conveying auger 510 rotates to convey the wax liquid in the direction close to the discharge port 212. During the conveying process, the wax liquid is stirred by the fixed stirring rod 610 and the rotating stirring rod 620 to prevent different components in the wax liquid (such as solid particles, additives or wax components with different melting points) from stratification or precipitation, thereby ensuring that the entire wax liquid remains in a uniform state. When conveyed to the discharge port 212, most of the wax liquid is squeezed out through the discharge port 212 and injected into the molding container. A small part of the wax liquid will enter the conveying cavity through the connecting groove 213. The conveying ring sleeve 800 in the conveying cavity rotates to reversely convey the wax liquid into the first cavity and the second cavity. The first heater in the first cavity and the second cavity heats the wax liquid to a higher temperature, and the wax liquid in the first cavity has a lower viscosity (the viscosity is lower than the preset viscosity), while the temperature heated by the second heater is lower than the temperature of the first heater, and the wax liquid in the second cavity has a higher viscosity (the viscosity is higher than the preset viscosity).

[0081] When the flow rates from the first cavity and the second cavity backflowing to the feed port 211 are set to be the same, the viscosity of the wax liquid in the cavity of the inner layer 210 of the injection head 200 is not affected. That is, under normal circumstances, the viscosity of the wax liquid input from the feed port 211 is the preset viscosity, and the openings of the first reflux groove 214 and the second reflux groove 215 are the same, so that the amount of wax liquid flowing back to the feed port 211 is the same, which does not affect the viscosity of the wax liquid, that is, the viscosity of the wax liquid is maintained at the preset viscosity.

[0082] When the viscosity sensor 230 senses that the viscosity of the wax liquid has changed, that is, when the viscosity of the wax liquid is higher or lower than the preset viscosity, the hydraulic control box 410 respectively adjusts the telescopic plates 420 located on the first reflux groove 214 and the second reflux groove 215 to adjust the amount of wax liquid flowing back to the feed port 211 through the first reflux groove 214 and the second reflux groove 215. If the viscosity of the wax liquid is higher than the preset viscosity, the hydraulic control box 410 controls the telescopic plate 420 on the first reflux groove 214 to retract, thereby increasing the opening of the first reflux groove 214, so that more wax liquid with lower viscosity in the first cavity flows back into the feed port 211, and tends to the preset viscosity after neutralization with the wax liquid with higher viscosity than the preset viscosity; similarly, if the viscosity of the wax liquid is lower than the preset viscosity, the hydraulic control box 410 controls the telescopic plate 420 on the second reflux groove 215 to retract, thereby increasing the opening of the second reflux groove 215, so that more wax liquid with higher viscosity in the second cavity flows back into the feed port 211, and tends to the preset viscosity after neutralization with the wax liquid with lower viscosity than the preset viscosity, thereby making the viscosity of the wax liquid discharged from the discharge port 212 uniform and tends to the preset viscosity.

[0083] After a molding container is filled with wax, a new molding container needs to be replaced. At this time, stop delivering wax liquid to the feed port 211, rotate the adjusting ring sleeve 700, so that the first adjusting groove 710 and the discharge port 212 are completely staggered, that is, the discharge port 212 is blocked, and the second adjusting groove 720 at this time is completely overlapped with the connecting groove 213, and the opening of the connecting groove 213 reaches the maximum. Except for stopping the wax liquid delivery to the feed port 211, all other operations are not stopped. Since the discharge port 212 is blocked, the wax liquid delivered by the delivery auger 510 enters the delivery cavity from the connecting groove 213, and then enters the first cavity and the second cavity from the delivery cavity, and flows back to the feed port 211 through the first reflux groove 214 and the second reflux groove 215. At the same time, the viscosity sensor 230 still plays a role in maintaining the wax liquid at a preset viscosity. The wax liquid is always circulating to prevent the viscosity of the wax liquid from being affected when it is not flowing.

[0084] After the molding container is replaced, the wax liquid continues to enter from the feed port 211, and the adjusting ring sleeve 700 is rotated to maximize the opening of the discharge port 212, thereby starting the wax injection.

[0085] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An automated wax injection machine for lost wax casting, characterized in that: include: A frame, wherein an injection head is arranged on the frame, wherein the injection head has an inner and outer layer, wherein a feed port and a discharge port are respectively provided on both end surfaces of the inner layer, wherein the cavity between the inner and outer layers is axially divided into a conveying cavity and a heating cavity, wherein the conveying cavity is connected to a position of the inner layer close to the discharge port, wherein the heating cavity is circumferentially divided into a first cavity and a second cavity, wherein the first cavity and the second cavity are respectively connected to a position of the inner layer close to the feed port, wherein the temperature in the first cavity is higher than the temperature in the second cavity, and when the wax liquid is squeezed out from the discharge port, part of the wax liquid passes through the conveying cavity into the first cavity and the second cavity and flows back to the feed port; A conveying assembly, the conveying assembly is used to convey the wax liquid from the feed inlet to the discharge outlet; A viscosity sensor, the viscosity sensor is arranged at the feed inlet, and the viscosity sensor is used to sense the viscosity of the wax liquid entering the feed inlet; A regulating component, the regulating component is used to regulate the flow rate of the wax liquid flowing back to the feed port through the first cavity and the second cavity; The adjustment component is configured to increase the flow rate of the wax liquid returning to the feed port through the second cavity when the viscosity of the feed port is lower than the preset viscosity, and increase the flow rate of the wax liquid returning to the feed port through the first cavity when the viscosity of the feed port is higher than the preset viscosity. The adjustment component includes a hydraulic control box and a telescopic plate. A first reflux groove and a second reflux groove are provided on the side wall of the inner layer near the feed port. The first reflux groove connects the first cavity and the inner layer, and the second reflux groove connects the second cavity and the inner layer. The telescopic plates are slidably inserted on the side walls of the first reflux groove and the second reflux groove, respectively. The hydraulic control box controls the telescopic plates to retract and retract to change the opening size of the first reflux groove and the second reflux groove, respectively. The flow rate of the wax liquid returning to the feed port through the first cavity or the second cavity is different from the flow rate of the wax liquid returning to the feed port through the first cavity or the second cavity. The size of the flow channel opening is positively correlated, a first heater is arranged in the first cavity, and a second heater is arranged in the second cavity, the power of the first heater is greater than the power of the second heater, an adjusting ring sleeve is rotatably arranged on the end surface of the inner layer close to the discharge port, a first adjusting groove is provided on the end surface of the adjusting ring sleeve close to the discharge port, a second adjusting groove is provided on the outer peripheral wall of the adjusting ring sleeve, and a connecting groove is provided on the side wall of the inner layer close to the discharge port, the first adjusting groove cooperates with the discharge port, and the second adjusting groove cooperates with the connecting groove; the adjusting ring sleeve is configured so that when the first adjusting groove completely overlaps with the discharge port, the overlapping part of the second adjusting groove and the connecting groove is the least, and when the first adjusting groove does not overlap with the discharge port, the second adjusting groove completely overlaps with the connecting groove.

2. The automatic wax injection machine for lost wax casting according to claim 1, characterized in that: The conveying assembly includes a conveying auger and a driving motor. The conveying auger is rotatably arranged in the inner layer. The blade edge of the conveying auger is in sliding contact with the inner wall of the inner layer. The driving motor drives the conveying auger to rotate to convey the wax liquid.

3. The automatic wax injection machine for lost wax casting according to claim 2, characterized in that: The inner layer is also provided with a stirring assembly, which includes a plurality of fixed stirring rods and a plurality of rotating stirring rods. The plurality of rotating stirring rods are fixedly arranged on the auger shaft of the conveying auger and are all distributed radially along the auger shaft. The plurality of fixed stirring rods are fixedly arranged on the inner wall of the inner layer and are staggered with the rotating stirring rods.

4. The automatic wax injection machine for lost wax casting according to claim 3, characterized in that: The lengths of the fixed stirring rods and the rotating stirring rods are the same, and the lengths are both the distances between the auger shaft and the inner wall of the inner layer.

5. The automatic wax injection machine for lost wax casting according to claim 1, characterized in that: A first rotating motor is fixedly arranged on the inner layer, a rotating shaft of the first rotating motor is fixedly connected to the adjusting ring sleeve, and the first rotating motor drives the adjusting ring sleeve to rotate.

6. The automatic wax injection machine for lost wax casting according to claim 1, characterized in that: A conveying ring sleeve is rotatably arranged in the conveying cavity, and the conveying ring sleeve is used to convey the refluxed wax liquid. A spiral blade is fixedly arranged on the inner surface of the conveying ring sleeve, and the spiral blade is in sliding contact with the outer wall of the inner layer. The refluxed wax liquid contacts the spiral blade, and the conveying ring sleeve rotates to convey the wax liquid.

7. The automatic wax injection machine for lost wax casting according to claim 6, characterized in that: A second rotating motor is arranged on the outer wall of the outer layer, a gear ring is arranged on the outer peripheral wall of the conveying ring sleeve, a gear of the second rotating motor passes through the outer wall and meshes with the gear ring, and the second rotating motor drives the conveying ring sleeve to rotate.

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