A lost foam mold shell dewaxing machine

Abstract

The application belongs to the technical field of investment casting and specifically relates to a wax removal machine for investment casting mold shells, which comprises a wax removal box, a supporting seat fixed to the bottom of the wax removal box, and a placing plate fixed to the inner wall of the top end of the wax removal box. Through the cooperation of a reciprocating screw rod, a double-end bidirectional screw rod and a shielding curtain, the opening motor is started, the output shaft of the motor drives the reciprocating screw rod to rotate, the reciprocating screw rod drives the lifting block to move, the lifting block drives the supporting plate to move, the supporting plate drives the wax mold to move upwards until the wax mold is moved to a proper height, the rotary block is rotated, the rotary block drives the double-end bidirectional screw rod to rotate, the double-end bidirectional screw rod drives the two arc-shaped plates at the two ends to move in the direction of the wax mold respectively until the wax mold is limited between the arc-shaped plates and in a proper aperture, and the shielding curtain is used to shield the chute during use to reduce or avoid the entry of water or wax liquid and affect the movement of the reciprocating screw rod driving the supporting plate.

Description

Technical Field

[0001] This invention belongs to the field of investment casting technology, specifically a dewaxing machine for investment casting mold shells. Background Technology

[0002] Investment casting, also known as lost-wax casting, involves creating a wax model of the part to be cast using wax. This wax model is then coated with clay slurry, forming a clay model. After the clay model dries, it is fired to form a ceramic model. Upon firing, the wax model completely melts and disappears, leaving only the ceramic model. Typically, a pouring gate is left when making the clay model, and molten metal is poured in through the pouring gate. After cooling, the desired part is formed. Once the mold shell has completely hardened, the mold assembly needs to be melted out of the shell. Because the mold assembly is often made of wax-based molding material, this process is also called dewaxing.

[0003] A Chinese patent with publication number CN108655343B discloses a dewaxing machine for investment casting mold shells, including an outer box and an inner box. The inner box contains a filter screen that divides the internal space into a heating layer and a dewaxing layer. A mold support base is located on top of the filter screen, with several equally spaced mounting holes. Four rectangular support blocks are located within the inner box. A heater is located within the heating layer. Water inlets and outlets are located on both sides of the outer box, and a drainage assembly is located beside the outer box. A hinged lid is mounted on the outer box, and a dryer is located on the lid. A temperature control device is located on the outer wall of the outer box, and four support legs are located at the bottom of the outer box. The dryer, drainage assembly, and heater are all electrically connected to the temperature control device. This design eliminates the need for manual inspection and dewaxing of the wax mold, reducing labor and material waste, thereby lowering production costs.

[0004] In the current technology, the support mold base is fixed inside the inner box and cannot be raised or lowered. However, different sizes of wax molds may require different immersion depths. If large wax molds are immersed too shallowly, residual wax will remain on the surface. If small precision parts are immersed too deeply, they may be damaged by prolonged high temperature. Furthermore, since the support mold base has a fixed height, it is inconvenient to put or take out the placement hole group one by one.

[0005] Therefore, the present invention provides a dewaxing machine for investment casting mold shells to solve the problems mentioned in the background art. Summary of the Invention

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A dewaxing machine for investment casting mold shells, comprising a dewaxing box; a support base fixedly connected to the bottom of the dewaxing box; a placement plate fixedly connected to the inner wall of the top of the dewaxing box, the placement plate having multiple placement holes; an adjustment mechanism on the placement plate for adjusting the diameter of the placement holes; a receiving plate below the placement plate, with lifting mechanisms at both ends of the receiving plate; the lifting mechanism comprising a reciprocating screw and lifting blocks; symmetrically formed sliding grooves on the inner sidewall of the dewaxing box, each groove containing a reciprocating screw rotatably connected via bearings; lifting blocks fixedly connected to both sidewalls of the receiving plate, each lifting block threadedly connected to the reciprocating screw; two guide rods fixedly connected to the inner wall of each sliding groove, each lifting block slidably connected to the guide rod; two motors embedded and fixedly connected inside the sidewall of the dewaxing box, the output shafts of the motors respectively fixedly connected to the top of the reciprocating screw; and shielding curtains on both sides of the receiving plate for shielding and covering the sliding grooves.

[0007] Preferably, the adjusting mechanism includes multiple arc-shaped plates disposed above the placement plate, with two adjacent arc-shaped plates symmetrically disposed at both ends of the placement hole; multiple crossbars are fixedly connected to the inner wall of the dewaxing box, and the arc-shaped plates are slidably connected to the multiple crossbars; a double-ended bidirectional screw is rotatably connected to the inner wall of the dewaxing box via bearings, and the arc-shaped plates are threadedly connected to the double-ended bidirectional screw; one end of the double-ended bidirectional screw extends to the outside of the dewaxing box and is fixedly connected to a rotating block.

[0008] Preferably, one end of each of the shielding curtains is fixed to the inner wall of the slide groove, and the other end of each of the shielding curtains is fixed to the receiving plate; the shielding curtain is a foldable curtain; each of the folding parts of the shielding curtain near the slide groove is rotatably connected to a rotating rod via a rotating shaft, and a slider is fixed to the outer side of each rotating rod; symmetrical limit grooves are opened on the side wall of the slide groove, and the sliders are slidably connected in the limit grooves.

[0009] Preferably, a hopper is fixedly connected to the bottom of the dewaxing box, and a first filter plate is fixedly connected to the inner wall of the bottom end of the hopper. The first filter plate is inclined. A second filter plate is provided above the first filter plate. The second filter plate is rotatably connected to the inner wall of the hopper through a rotating shaft. A torsion spring is provided at the connection between the rotating shaft and the second filter plate. Multiple rubber hammers are fixedly connected to the bottom of the second filter plate.

[0010] Preferably, a drain pipe is fixedly connected to the bottom of the hopper, a water storage tank is provided below the dewaxing box, the bottom end of the drain pipe is fixedly connected to the water storage tank, a drain valve is installed on the drain pipe, and a filter screen is fixedly connected to the top of the drain pipe.

[0011] Preferably, one end of the water inlet pipe is connected and fixed inside the water storage tank, and the other end of the water inlet pipe is connected to the dewaxing tank. A water pump is installed on the water inlet pipe, and the bottom of the water pump is fixed to the water storage tank through a side plate.

[0012] Preferably, a first discharge pipe is connected and fixedly connected to the bottom end of the hopper near the side wall of the filter screen, and a second discharge pipe is connected and fixedly connected to the bottom end of the hopper near the side wall of the first filter plate; both the first discharge pipe and the second discharge pipe are equipped with solenoid valves; a cyclone separator is provided on one side of the water storage tank, and a guide pipe is connected and fixedly connected to the top of the cyclone separator, and the bottom ends of both the first discharge pipe and the second discharge pipe are connected and fixedly connected to the guide pipe.

[0013] Preferably, a plurality of heating rods are fixedly connected to the inner wall of the bottom end of the dewaxing chamber, and a temperature sensor is installed on the side wall of the dewaxing chamber, with the heating rods communicating with the temperature sensor.

[0014] Preferably, an air storage box is provided on one side of the support base; an exhaust pipe is connected and fixed to the top of the air storage box, and one end of the exhaust pipe is connected and fixed to the top side wall of the dewaxing box; a filter element is installed at the end of the exhaust pipe near the dewaxing box; an air inlet pipe is connected and fixed to the top of the air storage box, and one end of the air inlet pipe is connected and fixed to the top side wall of the dewaxing box; a one-way valve is installed at the end of the air inlet pipe near the dewaxing box; and an air pump is provided at the end of the air inlet pipe near the air storage box.

[0015] Preferably, the top of the dewaxing chamber is hinged with a chamber lid; the bottom of the chamber lid is fixedly connected to a mounting frame, and the bottom of the mounting frame is fixedly connected to multiple heating wires; two fans are installed at the bottom of the chamber lid.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The present invention provides a dewaxing machine for investment casting mold shells. Through the cooperation of a reciprocating screw, a double-headed bidirectional screw, and a shielding curtain, the motor is activated, and the output shaft of the motor drives the reciprocating screw to rotate. The reciprocating screw drives the lifting block to move, which in turn drives the receiving plate to move. The receiving plate then drives the wax mold to move upwards until the wax mold reaches a suitable height. Rotating the rotating block drives the double-headed bidirectional screw to rotate, which in turn drives the arc-shaped plates at both ends to move towards the wax mold until the wax mold is confined between the arc-shaped plates and within a suitable aperture. The shielding curtain, during use, blocks the chute, reducing or preventing the entry of water or wax, which could affect the movement of the receiving plate driven by the reciprocating screw.

[0018] 2. The dewaxing machine for investment casting mold shells of the present invention uses a first filter plate and a second filter plate to filter molten wax. To prevent the molten wax from clogging the first filter plate and affecting water flow, the second filter plate is driven by a torsion spring to vibrate at high frequency while the water is flowing. The rubber hammer at the bottom of the second filter plate periodically strikes the surface of the first filter plate during the movement. For wet and sticky materials, the blockage is directly physically broken up. The torsion spring provides a controllable restoring torque, causing the second filter plate to produce regular micro-deformation. This achieves pre-separation of the second filter plate, quickly discharging large particles and reducing the load on the next stage. The first filter plate performs precise filtration and uses gravity assistance to complete fine interception.

[0019] 3. The investment casting mold shell dewaxing machine of the present invention, through the cooperation of the air inlet pipe and the exhaust pipe, uses a filter element to absorb the waste gas containing a small amount of wax vapor in the water vapor during the dewaxing process. After being treated by the filter element, the wax vapor molecules and tiny droplets are efficiently intercepted, so that the exhaust gas meets environmental protection standards and prevents harmful substances from spreading to the working environment or the external atmosphere. Then, under the action of the air pump, the gas is circulated. The purified gas carries the heat in the dewaxing box back and forms a self-heating effect, reducing the additional energy input. At the same time, the fan on the box cover is turned on, so that the high-speed flow of purified gas washes the surface of the mold shell, destroys the boundary layer between the wax layer and the shell, and accelerates the peeling of the wax liquid. Combined with the disturbance of the fan, a forced convection environment is formed, which significantly shortens the dewaxing time. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a sectional view of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the dewaxing box in this invention;

[0024] Figure 4 This is a schematic diagram of the structure of the placement plate in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the receiving plate in this invention;

[0026] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0027] Figure 7 This is a schematic diagram of the structure of the box cover in this invention;

[0028] Figure 8 This is a schematic diagram of the structure of the first filter plate and the second filter plate in this invention;

[0029] Figure 9 This is a schematic diagram of the material discharge hopper in this invention;

[0030] Figure 10 This is a schematic diagram of the gas storage tank in this invention;

[0031] In the diagram: 1. Dewaxing chamber; 11. Chamber lid; 111. Fan; 112. Heating wire; 113. Mounting frame; 12. Placement plate; 121. Placement hole; 122. Arc plate; 123. Crossbar; 124. Double-ended, two-way lead screw; 125. Rotating block; 13. Receiving plate; 131. Slide groove; 132. Motor; 133. Reciprocating lead screw; 134. Guide rod; 135. Lifting block; 136. Screen curtain; 137. Rotating rod; 138. Sliding block; 14. Heating rod; 141. Temperature sensor; 15. Feed hopper; 151. First filter plate; 152. Second filter plate; 153. Rubber hammer; 154. First discharge pipe; 155. Second discharge pipe; 2. Cyclone separator; 21. Guide pipe; 3. Drain pipe; 31. Water storage tank; 32. Water pump; 33. Water inlet pipe; 34. Filter screen; 4. Support base; 5. Air storage tank; 51. Exhaust pipe; 52. Air inlet pipe; 53. Filter element; 54. One-way valve; 55. Air pump. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0033] In some embodiments, such as Figures 1 to 5 As shown in the embodiment of the present invention, a dewaxing machine for investment casting mold shells includes a dewaxing box 1; a support base 4 is fixedly connected to the bottom of the dewaxing box 1; a placement plate 12 is fixedly connected to the inner wall of the top of the dewaxing box 1, and the placement plate 12 has multiple placement holes 121; the placement plate 12 is provided with an adjustment mechanism for adjusting the diameter of the placement holes 121; a receiving plate 13 is provided below the placement plate 12, and lifting mechanisms are provided at both ends of the receiving plate 13; the lifting mechanism includes a reciprocating screw 133 and a lifting block 135; symmetrical grooves 131 are provided on the inner sidewall of the dewaxing box 1, Each of the slide grooves 131 is rotatably connected to a reciprocating lead screw 133 via bearings. Lifting blocks 135 are fixedly connected to both sides of the receiving plate 13, and each lifting block 135 is threadedly connected to the reciprocating lead screw 133. Two guide rods 134 are fixedly connected to the inner wall of each slide groove 131, and each lifting block 135 is slidably connected to the guide rods 134. Two motors 132 are embedded and fixedly connected inside the side wall of the dewaxing box 1, and the output shafts of the motors 132 are respectively fixedly connected to the top of the reciprocating lead screw 133. Each side of the receiving plate 13 is provided with a shielding curtain 136 for shielding and covering the slide groove 131.

[0034] Investment casting involves creating a wax model of the part to be cast using wax. This wax model is then coated with clay slurry, forming a clay model. After drying, the clay model is fired to create a ceramic model. Upon firing, the wax model melts and is lost, leaving only the ceramic model. This process of melting the wax model is called dewaxing. In existing technology, the support mold base is fixed inside the inner casing and cannot be raised or lowered. However, different sizes of wax models may require different immersion depths. If large wax models are immersed too shallowly, residual wax may remain on the surface; if small precision parts are immersed too deeply, they may be damaged by prolonged high temperatures. Furthermore, because the support mold base has a fixed height, it is inconvenient to individually insert or remove the wax models from the mounting holes.

[0035] When using the lifting mechanism provided by this invention, the wax model first needs to be placed in the placement hole 121. After placement, the motor 132 needs to be turned on. The output shaft of the motor 132 drives the reciprocating screw 133 to rotate. The reciprocating screw 133 drives the lifting block 135 to move. The lifting block 135 drives the receiving plate 13 to move. The receiving plate 13 drives the wax model to move upward until the wax model is moved to a suitable height. Then, other wax models are placed in sequence. After all wax models are placed, the adjustment mechanism needs to be turned on to limit the wax model within a suitable aperture. The reciprocating screw 133 is provided with a shielding curtain 136 on its outer side to reduce or prevent water and wax from entering and prevent corrosion damage to the reciprocating screw 133, which would affect the lifting movement.

[0036] Furthermore, such as Figure 3 and Figure 4 As shown, the adjustment mechanism includes multiple arc-shaped plates 122 disposed above the placement plate 12, with two adjacent arc-shaped plates 122 symmetrically disposed at both ends of the placement hole 121; multiple crossbars 123 are fixedly connected to the inner wall of the dewaxing box 1, and the arc-shaped plates 122 are slidably connected to the multiple crossbars 123; a double-ended bidirectional lead screw 124 is rotatably connected to the inner wall of the dewaxing box 1 via bearings, and the arc-shaped plates 122 are threadedly connected to the double-ended bidirectional lead screw 124; one end of the double-ended bidirectional lead screw 124 extends to the outside of the dewaxing box 1 and is fixedly connected to a rotating block 125.

[0037] In order to prevent the wax model from tipping over or cracking due to excessive movement during boiling, the adjustment mechanism provided by this invention requires rotating the rotating block 125. The rotating block 125 drives the double-headed bidirectional lead screw 124 to rotate, which in turn drives the arc-shaped plates 122 at both ends to move towards the wax model until the wax model is limited between the arc-shaped plates 122 with a certain gap. The arc-shaped plates 122 are made of rubber to provide a certain cushioning effect for the wax model.

[0038] Furthermore, such as Figure 5 and Figure 6As shown, one end of each of the blind curtains 136 is fixed to the inner wall of the slide groove 131, and the other end of each of the blind curtains 136 is fixed to the receiving plate 13; the blind curtain 136 is a foldable curtain; each of the blind curtains 136 near the folding part of the slide groove 131 is rotatably connected to a rotating rod 137 via a rotating shaft, and a slider 138 is fixed to the outer side of each rotating rod 137; symmetrical limit grooves are opened on the side wall of the slide groove 131, and the sliders 138 are slidably connected in the limit grooves.

[0039] The shielding curtain 136 provided by the present invention is used to shield the slide groove 131 during use, reducing or preventing the entry of water or wax. During the movement of the receiving plate 13, the receiving plate 13 drives one end of the shielding curtain 136 to move. One side of the shielding curtain 136 is gradually folded, and the other side of the shielding curtain 136 is gradually unfolded. However, due to the influence of the rotating rod 137 and the slider 138, the shielding curtain 136 is kept folded or unfolded stably, and the reciprocating screw 133 inside the slide groove 131 is always protected to prevent wax from entering. After drying, the wax is easy to harden on the surface of the reciprocating screw 133, which affects the movement of the reciprocating screw 133 driving the receiving plate 13.

[0040] In some embodiments, such as Figure 2 and Figure 8 As shown, a hopper 15 is fixedly connected to the bottom of the dewaxing box 1. A first filter plate 151 is fixedly connected to the inner wall of the bottom end of the hopper 15. The first filter plate 151 is inclined. A second filter plate 152 is provided above the first filter plate 151. The second filter plate 152 is rotatably connected to the inner wall of the hopper 15 via a rotating shaft. A torsion spring is provided at the connection between the rotating shaft and the second filter plate 152. A plurality of rubber hammers 153 are fixedly connected to the bottom of the second filter plate 152.

[0041] The first filter plate 151 and the second filter plate 152 provided by this invention are used to filter wax liquid. To prevent the wax liquid from clogging the first filter plate 151 and affecting the flow of water, the second filter plate 152 is driven by a torsion spring to vibrate at high frequency while the water is flowing. The rubber hammer 153 at its bottom periodically strikes the surface of the first filter plate 151 with the action. For wet and sticky materials, it directly and physically breaks up the blockage. The torsion spring provides a controllable restoring torque, which causes the second filter plate 152 to produce regular and small deformations. Finally, the second filter plate 152 is pre-separated to quickly discharge large particles and reduce the load on the next stage. The first filter plate 151 completes fine interception through precise filtration using gravity assistance.

[0042] Furthermore, such as Figure 2As shown, a drain pipe 3 is fixedly connected to the bottom of the hopper 15, and a water storage tank 31 is provided below the dewaxing box 1. The bottom end of the drain pipe 3 is fixedly connected to the water storage tank 31, and a drain valve is installed on the drain pipe 3. A filter screen 34 is fixedly connected to the top of the drain pipe 3. One end of a water inlet pipe 33 is fixedly connected to the inside of the water storage tank 31, and the other end of the water inlet pipe 33 is connected to the dewaxing box 1. A water pump 32 is installed on the water inlet pipe 33, and the bottom of the water pump 32 is fixedly connected to the water storage tank 31 through a side plate.

[0043] The filter screen 34 provided by this invention is used for secondary filtration of wax in water, so that the wax can be better recovered. After the water is heated in the water bath, it is filtered and the drain valve is opened, and the water flows into the water storage tank 31 through the drain pipe 3 for reuse. When water bath heating is required, the water pump 32 is turned on, and the water in the water storage tank 31 is output to the water inlet pipe 33 and input into the dewaxing tank 1 through the water inlet pipe 33, thereby completing the water recycling.

[0044] Furthermore, such as Figure 1 Figure 2 and Figure 9 As shown, a first discharge pipe 154 is connected and fixed to the bottom end of the hopper 15 near the side wall of the filter screen 34, and a second discharge pipe 155 is connected and fixed to the bottom end of the hopper 15 near the side wall of the first filter plate 151; both the first discharge pipe 154 and the second discharge pipe 155 are equipped with solenoid valves; a cyclone separator 2 is provided on one side of the water storage tank 31, and a guide pipe 21 is connected and fixed to the top of the cyclone separator 2, and the bottom ends of the first discharge pipe 154 and the second discharge pipe 155 are both connected and fixed to the guide pipe 21.

[0045] The first discharge pipe 154 and the second discharge pipe 155 provided by the present invention are used to discharge wax liquid near the filter screen 34 through the first discharge pipe 154 and to discharge wax liquid on the first filter plate 151 through the second discharge pipe 155. The wax liquid enters the guide pipe 21 through the first discharge pipe 154 and the second discharge pipe 155 and flows into the cyclone separator 2 through the guide pipe 21 to separate impurities in the wax liquid. The wax liquid is discharged from the liquid outlet pipe on one side of the cyclone separator 2 and the impurities are discharged from the ash hopper at the bottom of the cyclone separator 2, which improves the accuracy of the wax liquid and is beneficial to the recovery of the wax liquid.

[0046] In some embodiments, such as Figure 2 As shown, a plurality of heating rods 14 are fixedly connected to the inner wall of the bottom end of the dewaxing chamber 1, and a temperature sensor 141 is installed on the side wall of the dewaxing chamber 1. The heating rods 14 are communicatively connected to the temperature sensor 141.

[0047] The heating rod 14 provided by the present invention is used to increase the water temperature in the dewaxing tank 1 and to heat the water in the dewaxing tank 1. The water temperature in the dewaxing tank 1 can be measured by the temperature sensor 141. The melted wax flows down from the receiving plate 13 and is dewaxed by water bath heating, thus realizing intelligent temperature control.

[0048] like Figure 2 and Figure 10 As shown, a gas storage box 5 is provided on one side of the support base 4; an exhaust pipe 51 is connected and fixed to the top of the gas storage box 5, and one end of the exhaust pipe 51 is connected and fixed to the top side wall of the dewaxing box 1; a filter element 53 is installed at the end of the exhaust pipe 51 near the dewaxing box 1; an air inlet pipe 52 is connected and fixed to the top of the gas storage box 5, and one end of the air inlet pipe 52 is connected and fixed to the top side wall of the dewaxing box 1; a one-way valve 54 is installed at the end of the air inlet pipe 52 near the dewaxing box 1; and an air pump 55 is provided at the end of the air inlet pipe 52 near the gas storage box 5.

[0049] The filter element 53 provided by this invention is used to absorb the waste gas containing a small amount of wax vapor in the water vapor during the dewaxing process. After being treated by the filter element 53, it efficiently intercepts wax vapor molecules and tiny droplets, so that the emitted gas meets environmental protection standards and prevents harmful substances from spreading to the working environment or the external atmosphere. Then, under the action of the air pump 55, the gas is circulated. The purified gas carries the heat in the dewaxing box 1 back and forms a self-heating effect, reducing the additional energy input. At the same time, the fan 111 on the box cover 11 is turned on, so that the high-speed flow of purified gas washes the surface of the mold shell, destroys the boundary layer between the wax layer and the mold shell, and accelerates the peeling of the wax liquid. In addition, the disturbance of the fan 111 forms a forced convection environment, which significantly shortens the dewaxing time.

[0050] like Figure 7 As shown, the top of the dewaxing chamber 1 is hinged with a chamber cover 11; the bottom of the chamber cover 11 is fixed with a mounting frame 113, and the bottom of the mounting frame 113 is fixed with a plurality of heating wires 112; two fans 111 are installed at the bottom of the chamber cover 11.

[0051] The heating wire 112 and fan 111 provided by the present invention are used to dry the dewaxed ceramic mold. During dewaxing, the hot steam combined with the disturbance of the fan 111 forms a forced convection environment, which significantly shortens the dewaxing time.

[0052] Working principle: First, the wax model needs to be placed in the placement hole 121. After placement, the motor 132 needs to be turned on. The output shaft of the motor 132 drives the reciprocating screw 133 to rotate. The reciprocating screw 133 drives the lifting block 135 to move. The lifting block 135 drives the receiving plate 13 to move. The receiving plate 13 drives the wax model to move upward until the wax model is moved to a suitable height. Then, other wax models are placed in sequence. After all are placed, the rotating block 125 needs to be rotated. The rotating block 125 drives the double-headed bidirectional screw 124 to rotate. The double-headed bidirectional screw 124 drives the arc plates 122 at both ends to move towards the wax model until the wax model is limited between the arc plates 122 with a certain gap, thus limiting the wax model within the appropriate hole diameter.

[0053] The shielding curtain 136 is used to shield the slide groove 131 during use, reducing or preventing the entry of water or wax. During the movement of the receiving plate 13, the receiving plate 13 drives one end of the shielding curtain 136 to move. One side of the shielding curtain 136 gradually folds, and the other side of the shielding curtain 136 gradually unfolds. However, due to the influence of the rotating rod 137 and the slider 138, the shielding curtain 136 is kept stable in folding or unfolding, and always protects the reciprocating screw 133 inside the slide groove 131 to prevent wax from entering. After drying, wax is easily hardened on the surface of the reciprocating screw 133, affecting the movement of the reciprocating screw 133 driving the receiving plate 13.

[0054] The first filter plate 151 and the second filter plate 152 are used to filter wax liquid. To prevent the wax liquid from clogging the first filter plate 151 and affecting the water flow, the second filter plate 152 is driven by a torsion spring to vibrate at a high frequency while the water is flowing. The rubber hammer 153 at its bottom periodically strikes the surface of the first filter plate 151 with the action. For wet and sticky materials, it directly and physically breaks up the blockage. The torsion spring provides a controllable restoring torque, which causes the second filter plate 152 to produce regular and slight deformation. Finally, the second filter plate 152 is pre-separated to quickly discharge large particles and reduce the load on the next stage. The first filter plate 151 completes fine interception through precise filtration using gravity assistance. When in use, filter screen 34 is used for secondary filtration of wax in the water, enabling better wax recovery. After the water is heated in the water bath, it is filtered and drained through drain pipe 3 into water storage tank 31 for reuse. When water bath heating is required, water pump 32 is turned on to pump water from water storage tank 31 to inlet pipe 33, which then feeds the water into dewaxing tank 1, thus completing the water recycling process. Wax near filter screen 34 is discharged through first discharge pipe 154, and wax on first filter plate 151 is discharged through second discharge pipe 155. The wax then enters guide pipe 21 through both discharge pipes 154 and 155, flowing into cyclone separator 2 to separate impurities from the wax. The wax is discharged from the outlet pipe on one side of cyclone separator 2, and impurities are discharged from the ash hopper at the bottom of cyclone separator 2, improving the wax's purity and facilitating its recovery.

[0055] When in use, filter element 53 is used to absorb the waste gas containing a small amount of wax vapor in the water vapor during the dewaxing process. After being treated by filter element 53, it efficiently intercepts wax vapor molecules and tiny droplets, so that the emitted gas meets environmental protection standards and prevents harmful substances from spreading to the working environment or the external atmosphere. Then, under the action of air pump 55, the gas is circulated. The purified gas carries the heat in the dewaxing box 1 back and forms a self-heating effect, reducing additional energy input. At the same time, the fan 111 on the box cover 11 is turned on, so that the high-speed flow of purified gas washes the surface of the mold shell, destroys the boundary layer between the wax layer and the mold shell, and accelerates the peeling of wax liquid. Combined with the disturbance of fan 111, a forced convection environment is formed, which significantly shortens the dewaxing time.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dewaxing machine for investment casting mold shells, comprising a dewaxing box (1); a support base (4) is fixedly connected to the bottom of the dewaxing box (1); a placement plate (12) is fixedly connected to the inner wall of the top of the dewaxing box (1), and a plurality of placement holes (121) are provided on the placement plate (12); an adjustment mechanism is provided on the placement plate (12) for adjusting the aperture of the placement holes (121); a receiving plate (13) is provided below the placement plate (12), and lifting mechanisms are provided at both ends of the receiving plate (13); characterized in that: The lifting mechanism includes a reciprocating lead screw (133) and a lifting block (135); the inner wall of the dewaxing box (1) is symmetrically provided with a sliding groove (131), and the reciprocating lead screw (133) is rotatably connected in the sliding groove (131) through a bearing; the two side walls of the receiving plate (13) are fixedly connected with lifting blocks (135), and the lifting blocks (135) are threadedly connected to the reciprocating lead screw (133); the inner wall of the sliding groove (131) is fixedly connected with two guide rods (134), and the lifting blocks (135) are slidably connected to the guide rods (134); the side wall of the dewaxing box (1) is embedded and fixedly connected with two motors (132), and the output shafts of the motors (132) are respectively fixedly connected to the top of the reciprocating lead screw (133); the two sides of the receiving plate (13) are provided with a shielding curtain (136) for shielding and covering the sliding groove (131). The adjustment mechanism includes multiple arc-shaped plates (122) disposed above the placement plate (12), with two adjacent arc-shaped plates (122) symmetrically disposed at both ends of the placement hole (121); multiple crossbars (123) are fixedly connected to the inner wall of the dewaxing box (1), and the arc-shaped plates (122) are all slidably connected to the multiple crossbars (123); a double-ended bidirectional screw (124) is rotatably connected to the inner wall of the dewaxing box (1) through bearings, and the arc-shaped plates (122) are all threadedly connected to the double-ended bidirectional screw (124); one end of the double-ended bidirectional screw (124) extends to the outside of the dewaxing box (1) and is fixedly connected to a rotating block (125). The bottom of the dewaxing box (1) is connected to a hopper (15), and a first filter plate (151) is fixed to the inner wall of the bottom end of the hopper (15). The first filter plate (151) is inclined. A second filter plate (152) is provided above the first filter plate (151). The second filter plate (152) is rotatably connected to the inner wall of the hopper (15) through a rotating shaft. A torsion spring is provided at the connection between the rotating shaft and the second filter plate (152). Multiple rubber hammers (153) are fixed to the bottom of the second filter plate (152). A gas storage box (5) is provided on one side of the support base (4); an exhaust pipe (51) is connected to the top of the gas storage box (5), and one end of the exhaust pipe (51) is connected to the top side wall of the dewaxing box (1); a filter element (53) is installed at the end of the exhaust pipe (51) near the dewaxing box (1); an air inlet pipe (52) is connected to the top of the gas storage box (5), and one end of the air inlet pipe (52) is connected to the top side wall of the dewaxing box (1); a one-way valve (54) is installed at the end of the air inlet pipe (52) near the dewaxing box (1); an air pump (55) is provided at the end of the air inlet pipe (52) near the gas storage box (5).

2. The dewaxing machine for investment casting mold shells according to claim 1, characterized in that: One end of each of the shielding curtains (136) is fixed to the inner wall of the slide groove (131), and the other end of each of the shielding curtains (136) is fixed to the receiving plate (13). The shielding curtains (136) are foldable curtains. The folding parts of each shielding curtain (136) near the slide groove (131) are rotatably connected to a rotating rod (137) via a rotating shaft. A slider (138) is fixed to the outer side of each rotating rod (137). Limiting grooves are symmetrically opened on the side wall of the slide groove (131), and the sliders (138) are slidably connected in the limiting grooves.

3. The dewaxing machine for investment casting mold shells according to claim 2, characterized in that: The bottom of the hopper (15) is connected to a drain pipe (3), and a water storage tank (31) is provided below the dewaxing box (1). The bottom end of the drain pipe (3) is connected to the water storage tank (31), and a drain valve is installed on the drain pipe (3). A filter screen (34) is fixed to the top of the drain pipe (3).

4. The dewaxing machine for investment casting mold shells according to claim 3, characterized in that: One end of the water inlet pipe (33) is connected to the water storage tank (31), and the other end of the water inlet pipe (33) is connected to the dewaxing tank (1). A water pump (32) is installed on the water inlet pipe (33), and the bottom of the water pump (32) is fixed to the water storage tank (31) through a side plate.

5. A dewaxing machine for investment casting mold shells according to claim 4, characterized in that: The bottom end of the hopper (15) is connected to the side wall of the filter screen (34) and a first discharge pipe (154) is connected to the side wall of the bottom end of the hopper (15) and a second discharge pipe (155) is connected to the side wall of the first filter plate (151). Solenoid valves are installed on the first discharge pipe (154) and the second discharge pipe (155). A cyclone separator (2) is provided on one side of the water storage tank (31). A guide pipe (21) is connected to the top of the cyclone separator (2). The bottom ends of the first discharge pipe (154) and the second discharge pipe (155) are connected to the guide pipe (21).

6. A dewaxing machine for investment casting mold shells according to claim 5, characterized in that: Multiple heating rods (14) are fixed to the inner wall of the bottom end of the dewaxing box (1), and a temperature sensor (141) is installed on the side wall of the dewaxing box (1). The heating rods (14) are communicatively connected to the temperature sensor (141).

7. A dewaxing machine for investment casting mold shells according to claim 6, characterized in that: The top of the dewaxing chamber (1) is hinged with a chamber cover (11); the bottom of the chamber cover (11) is fixed with a mounting frame (113), and the bottom of the mounting frame (113) is fixed with multiple heating wires (112); two fans (111) are installed at the bottom of the chamber cover (11).

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