Liquid level height control device and method for wax pattern module automatic bonding process

Abstract

The invention relates to a liquid level height control device and method for an automatic bonding process of a wax pattern module, belongs to the technical field of casting, and solves the problem of uneven wax dipping caused by the fact that the liquid level height of wax liquid cannot be maintained in a set value range when the wax pattern module is automatically bonded in the prior art. The device comprises a wax melting unit, a measuring unit and a liquid level adjusting unit, the wax melting unit is used for heating and melting the bonding wax into a liquid state; the measuring unit is used for measuring the liquid level height of the wax liquid of the wax melting unit; the liquid level adjusting unit adjusts and controls the liquid level in real time according to the measured value of the measuring unit. The liquid level height of the wax liquid can be maintained within a set value range, so that wax dipping is uniform.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a liquid level control device and method for an automatic bonding process of wax mold modules. Background Technology

[0002] The assembly of wax model modules is a crucial step in investment casting, directly impacting the quality of the casting. The wax-dipping method involves dipping the wax model in a melting pool with a small amount of liquid binder wax before directly assembling it onto the gating system. Traditional melting pools have simple structures, only providing heating for melting the wax; the liquid level gradually decreases during use, leading to uneven wax application. Furthermore, the binder wax is typically a medium-temperature wax, used at temperatures between 130-180℃, and is a semi-transparent, highly viscous liquid, making it difficult to meet the operating temperature and media reflectivity requirements of conventional distance measuring sensors, easily resulting in insufficient measurement accuracy. Summary of the Invention

[0003] Based on the above analysis, the present invention aims to provide a liquid level height control device and method for the automatic bonding process of wax mold modules, in order to solve the problem that the wax liquid level cannot be maintained within the set value range during the automatic bonding of wax mold modules, resulting in uneven wax application or inaccurate measurement or poor adjustment accuracy in liquid level control due to high viscosity bonding wax, thus failing to effectively control the liquid level.

[0004] The objective of this invention is mainly achieved through the following technical solutions:

[0005] In one aspect, the present invention provides a liquid level control device, comprising a wax dissolving unit, a measuring unit, and a liquid level regulating unit;

[0006] The wax melting unit is used to heat and melt the adhesive wax into a liquid state; the measuring unit is used to measure the liquid level height of the wax melting unit; the liquid level adjustment unit adjusts the liquid level in real time according to the measurement value of the measuring unit.

[0007] Furthermore, the wax melting unit includes a wax melting tank; the wax melting tank is used to hold liquid wax.

[0008] Furthermore, the wax melting tank has an automatic temperature control system, which is used to control the temperature of the wax liquid in the wax melting tank.

[0009] Furthermore, the tray is positioned below the wax melting tank and is used to collect any leaked wax from the wax melting tank.

[0010] Furthermore, the wax melting unit also includes an aluminum block, which is embedded in the bottom of the wax melting pool.

[0011] Furthermore, the liquid level regulating unit includes a servo module.

[0012] Furthermore, the servo module includes a servo motor, a slide module, and a slider.

[0013] Furthermore, the slider is mounted on the slide module, and the servo motor drives the slider to move up and down.

[0014] Furthermore, it also includes a control unit.

[0015] Furthermore, the measuring unit includes a laser displacement sensor and a float assembly;

[0016] The float assembly includes a guide rod and a float, the length of which is perpendicular to the liquid level; the float passes through the guide rod and moves up and down along the guide rod as the liquid level rises and falls.

[0017] The laser displacement sensor is located on one side of the wax melting tank and is used to measure the height of the float.

[0018] Furthermore, the liquid level adjustment unit also includes a sensing bracket and a photoelectric sensor, the photoelectric sensor being used to sense the position of the slider.

[0019] Furthermore, the liquid level adjustment unit also includes a balance block assembly, which includes a balance block; the balance block is disposed on the slider via a connecting block and a heat insulation plate; the balance block can rise and fall with the slider to change the height of immersion in the liquid.

[0020] A second aspect of the present invention provides a liquid level control method for an automatic bonding process of wax mold modules, employing the aforementioned liquid level control device for an automatic bonding process of wax mold modules, comprising the following steps:

[0021] Step 1: The wax melting unit heats and melts the adhesive wax, and the measuring unit detects the height of the wax liquid level;

[0022] Step 2: The control unit receives the liquid level data, and the liquid level adjustment unit adjusts the liquid level.

[0023] Further, step 1 specifically includes:

[0024] The measurement unit detects the height of the wax liquid level specifically by using a laser displacement sensor and a float to detect the wax liquid level.

[0025] Furthermore, the float moves with the liquid level and moves up and down along the guide rod according to the liquid level; a laser displacement sensor is set above the float to detect the position of the float and feed it back to the control unit in real time.

[0026] Furthermore, step 2 specifically includes:

[0027] The liquid level regulating unit regulates the liquid level height, specifically including:

[0028] The control unit receives the float height data from the laser displacement sensor, obtains the liquid level height, calculates the movement direction and distance of the balance block based on the liquid level height, starts the servo motor of the sliding module, and drives the slider and balance block to move to adjust the liquid level height.

[0029] Furthermore, the movement direction of the adjusting balance block is specifically as follows: when the liquid level is detected to be lower than the target value and the difference is greater than the allowable value, the slide module is controlled to drive the balance block to move downward, so that the wax liquid level rises; when the liquid level is detected to be higher than the target value and the difference is greater than the allowable value, the slide module is controlled to drive the balance block to move upward, so that the wax liquid level falls.

[0030] Furthermore, the distance x of the balance block's movement is calculated according to the formula x = ΔT × S1 / S2;

[0031] Wherein, S1 is the average effective area of ​​the constant temperature wax melting tank, in m². 2 S2 is the effective area of ​​the balance block, in m². 2 ΔT represents the deviation between the target value and the measured value, in meters (m).

[0032] Furthermore, the specific liquid level adjustment process is as follows:

[0033] The liquid level adjustment unit is activated, and the laser displacement sensor detects the liquid level value and calculates the difference ΔT between the measured value and the target value. If the difference is not within the allowable value A, the servo adjustment amount is calculated, and the liquid level adjustment unit is controlled to move at a speed v according to the adjustment amount. If the difference is within the allowable value A, the laser displacement sensor repeatedly detects the liquid level value.

[0034] Furthermore, the method for detecting liquid level values ​​using the laser displacement sensor specifically includes:

[0035] The measurement unit is activated, and the laser displacement sensor measures n times with an interval of s seconds between each measurement, recording the data. The maximum and minimum values ​​are removed, and the average value of the remaining recorded data is calculated. The output is the currently detected liquid level value.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] (1) The liquid level control device of the present invention includes a wax melting unit, a measuring unit and a liquid level adjustment unit. The measuring unit measures the liquid level of the wax melting unit in real time, and the liquid level adjustment unit adjusts the liquid level in real time according to the liquid level measurement value, so that the liquid level of the wax is dynamically maintained within the set value range, so as to solve the problem that the liquid level of the wax cannot be stabilized when the wax mold module is automatically bonded, resulting in uneven wax application.

[0038] (2) In this invention, the float is inserted through the guide rod, allowing it to float and rise and fall with the liquid level, sliding on the guide rod. The laser displacement sensor measures the height of the float and feeds it back to the control unit in real time. The float flexibly adjusts its position according to the liquid level changes, relying solely on the balance between buoyancy and gravity, and is synchronized with the liquid level in real time. Without additional mechanical constraints, there will be no jamming or lag problems caused by the adhesion resistance of high-viscosity adhesive wax, thus improving the measurement accuracy. The laser sensor does not need to be in direct contact with the high-viscosity adhesive wax, avoiding measurement failure or deviation caused by wax adhesion to the sensor probe. The laser displacement sensor and the float assembly work together to improve measurement accuracy and reliability, effectively solving the problem of inaccurate measurement caused by high-viscosity adhesive wax.

[0039] (3) The present invention uses a servo motor to precisely control the lifting stroke of the slide module, thereby driving the balance block to adjust the immersion depth in real time, so as to dynamically maintain the wax liquid level at the set value. It has a fast response speed and high adjustment accuracy, which can effectively suppress the liquid level change caused by the fluctuation of wax melting, wax dipping and other processes, improve the dimensional accuracy and surface quality consistency of the wax model, and solve the problem of poor adjustment accuracy in liquid level control and inability to effectively control the liquid level.

[0040] (4) In this invention, the liquid level height is measured by a combination of a float and a laser displacement sensor. The slide module drives the slider and balance block to move and adjust the liquid level height, so that the liquid level height can be dynamically compensated in real time and the liquid level height can be kept stable. This improves the response accuracy and reliability of the liquid level height adjustment, thus solving the problem of uneven wax application caused by the inability to maintain the liquid level within the set value range.

[0041] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0042] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0043] Figure 1 This is a schematic diagram of the liquid level control device in Example 1;

[0044] Figure 2 This is a schematic diagram of the measurement unit in Example 1;

[0045] Figure 3 This is a schematic diagram of the liquid level regulating unit in Example 1;

[0046] Figure 4This is a schematic diagram of the framework of Example 1;

[0047] Figure 5 This is a flowchart illustrating the use of the liquid level control device in Example 2;

[0048] Figure 6 This is a flowchart of the liquid level control method in Example 2.

[0049] Figure label:

[0050] 1-Wax melting unit; 11-Tray; 12-Wax melting pool; 13-Aluminum block; 2-Measuring unit; 21-Sensor bracket; 22-Laser displacement sensor; 23-Mounting bracket; 24-Guide rod; 25-Float; 26-Snap ring; 27-Nut; 3-Level adjustment unit; 31-Servo motor; 32-Slide module; 33-Photoelectric sensor; 34-Induction bracket; 35-Slider mounting plate; 36-Connecting plate; 37-Heat insulation plate; 38-Balance block; 39-Slider; 4-Control unit; 5-Frame; 51-Frame body; 52-Sealing plate; 53-Protective cover. Detailed Implementation

[0051] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0052] Example 1

[0053] A specific embodiment of the present invention, such as Figure 1 As shown, a liquid level control device for an automatic bonding process of wax mold modules is disclosed, including a wax melting unit 1, a measuring unit 2, and a liquid level adjustment unit 3.

[0054] The wax melting unit 1 is used to heat and melt the adhesive wax into a liquid state. The measuring unit 2 is used to measure the liquid level height of the wax in the wax melting unit 1; the liquid level adjustment unit 3 adjusts the liquid level in real time according to the measurement value of the measuring unit 2.

[0055] The liquid level control device in this embodiment includes a wax melting unit, a measuring unit, and a liquid level adjustment unit. The measuring unit measures the liquid level of the wax in the wax melting unit in real time, and the liquid level adjustment unit adjusts the liquid level in real time according to the measured liquid level value, so that the liquid level of the wax is dynamically maintained within the set value range, thereby solving the problem that the liquid level of the wax cannot be stabilized when the wax mold module is automatically bonded, resulting in uneven wax application.

[0056] like Figure 1 As shown, the wax melting unit 1 is used to heat and melt the adhesive wax into a liquid state, with a maximum heating temperature of 200°C. The wax melting unit 1 includes a wax melting pool 12, a tray 11, and an aluminum block 13.

[0057] The wax melting tank 12 is used to hold molten wax. The wax melting tank 12 has an automatic temperature control system to control the temperature of the molten wax in the wax melting tank 12 so that the temperature of the molten wax meets the requirements of the wax dipping process. The tray 11 is placed below the wax melting tank 12 to catch any leaked molten wax.

[0058] The aluminum block 13 is embedded in the bottom of the wax melting pool 12. It conducts heat evenly to accelerate the wax melting speed and is used to flatten the bonding part of the wax model when dipping it in wax liquid, so as to avoid the bonding being weak due to uneven bonding surface.

[0059] like Figure 2 As shown, the measuring unit 2 is used to monitor the liquid wax level in the wax melting tank 12 in real time. The measuring unit 2 includes a float assembly and a laser displacement sensor 22.

[0060] The float assembly is located on one side of the wax melting tank 12 and includes a mounting bracket 23, a guide rod 24 mounted on the mounting bracket 23, and a float 25 that can slide up and down along the guide rod 24. The length direction of the guide rod 24 is perpendicular to the liquid level. The float 25 passes through the guide rod 24 and can float on the liquid level, rising and falling with the liquid level, and sliding on the guide rod 24.

[0061] The laser displacement sensor 22 is mounted on the sensor bracket 21 at the top of the wax melting tank 12 above the float 25. It is used to measure the height of the float 25 and provide real-time feedback to the control unit.

[0062] Furthermore, to address the limitation issue of the float 25, this application also includes a limiting structure. The limiting structure is located at the top and bottom of the guide rod 24 to restrict the movement range of the float 25 and prevent it from detaching. Exemplarily, the limiting structure includes a retaining spring 26 and a nut 27. The guide rod 24 has a retaining groove, and the retaining spring 26 is clamped into the groove of the guide rod 24, limiting the highest upward movement of the float 25; the nut 27 is tightened onto the lower plate of the mounting bracket 23, limiting the lowest downward movement of the float 25. The retaining spring 26 and the nut 27 cooperate to ensure that the float 25 slides stably within a predetermined stroke, preventing the float 25 from derailing or impacting the sensor due to drastic fluctuations in the liquid level, thus ensuring the long-term reliable operation of the measurement system.

[0063] To address the measurement inaccuracies caused by high-viscosity adhesive wax, this embodiment incorporates a float 25 and a laser displacement sensor 22. The float 25 flexibly adjusts its position according to changes in liquid level, relying solely on the balance between buoyancy and gravity, and is synchronized with these changes in real time. Without additional mechanical constraints, it avoids jamming or lag issues caused by the adhesion resistance of the high-viscosity adhesive wax, thus improving measurement accuracy. The laser displacement sensor 22 does not need to directly contact the high-viscosity adhesive wax, preventing measurement failures or deviations caused by wax adhesion to the sensor probe. The laser displacement sensor 22 and the float assembly work together to improve measurement accuracy and reliability, effectively solving the measurement inaccuracies caused by high-viscosity adhesive wax.

[0064] like Figure 3 As shown, the liquid level adjustment unit 3 receives the signal from the measurement unit 2 to maintain the liquid level within the set range, avoiding uneven wax application caused by liquid level fluctuations, and improving the wax mold forming quality and production stability.

[0065] The liquid level adjustment unit 3 includes a servo module and a balance block 38 assembly. The servo module includes a servo motor 31, a slide module 32, and a slider 39. The servo motor 31 is fixed to the lower part of the slide module 32, and the slider 39 is disposed on the slide module 32 and can slide on the slide module 32.

[0066] Furthermore, the liquid level regulating unit 3 also includes a sensing bracket 34 and a photoelectric sensor 33. The sensing bracket 34 is disposed on the slider 39 and is used to sense the position of the slider 39 in real time.

[0067] Photoelectric sensors 33 are mounted on the slide module 32 to monitor the position changes of the slider 39 in real time and feed the displacement signal back to the control unit. For example, three photoelectric sensors 33 are provided to monitor the upper limit, lower limit, and real-time position of the slider 39, respectively. When the position of the slider 39 exceeds the preset travel range, the control unit immediately issues an alarm and stops the servo motor 31 to prevent mechanical overload or equipment collision.

[0068] The balance block 38 assembly is connected to the slider 39 via the slider mounting plate 35 and moves synchronously with the slider 39 along the slide module 32, improving the stability and accuracy of liquid level adjustment. The servo motor 31 receives commands from the control unit and drives the slider 39 to move precisely on the slide module 32, thereby raising and lowering the balance block 38 assembly.

[0069] The balance block 38 assembly includes a balance block 38, a connecting plate 36, and a heat insulation plate 37. The connecting plate 36 is disposed on top of the slider 39 mounting plate, and the balance block 38 is disposed below the connecting plate 36. A heat insulation plate 37 is disposed between the balance block 38 and the connecting plate 36 to block heat conduction from the balance block 38 to the connecting plate 36 and the slide module 32, preventing high temperatures from affecting the motion accuracy of the slider 39 and the performance of the servo motor 31. For example, the heat insulation plate 37 is made of mica and resin.

[0070] To address the issue of poor adjustment accuracy and ineffective liquid level control in this embodiment, a servo motor 31 drives the slider 39 and the balance block 38 to rise and fall. By changing the stroke of the slider 39, the movement of the balance block 38 is adjusted, thereby changing the immersion depth of the balance block 38 in the liquid, thus raising or lowering the liquid level to meet the requirements of the wax dipping process. Furthermore, the balance block 38 can adjust its immersion depth in real time, dynamically maintaining the wax level stable at the set value. This provides a fast response and high adjustment accuracy, effectively suppressing liquid level changes caused by fluctuations in the wax melting and dipping processes, and improving the dimensional accuracy and surface quality consistency of the wax model.

[0071] Furthermore, it also includes a control unit 4, which is used for analyzing and processing detection data, recording data, and controlling the movement of mechanical structures.

[0072] Furthermore, such as Figure 4 As shown, it also includes a frame 5. The wax dissolving unit 1, the measuring unit 2, and the liquid level regulating unit 3 are mounted on the frame 5.

[0073] The frame 5 includes a frame body 51, a sealing plate 52, and a protective cover 53. The sealing plate 52 is disposed on the side of the frame body 51 to protect the control unit 4. The protective cover 53 is disposed outside the liquid level regulating unit 3 and the measuring unit 2 to prevent external impurities from entering the liquid level regulating unit 3 and the measuring unit 2.

[0074] Example 2

[0075] This embodiment discloses a liquid level control method for an automatic bonding process of wax mold modules, which adopts the liquid level adjustment device for an automatic bonding process of wax mold modules in Embodiment 1.

[0076] like Figure 5 As shown, the specific steps include:

[0077] Step 1: The wax melting unit 1 heats and melts the adhesive wax, and the measuring unit 2 detects the height of the wax liquid level;

[0078] Step 2: Control unit 4 receives liquid level data, and liquid level adjustment unit 3 adjusts the liquid level.

[0079] Step 1 specifically includes:

[0080] The wax melting tank 12 of the wax melting unit 1 has an automatic temperature control system to heat the wax liquid to the required temperature for dipping; the aluminum block 13 accelerates the wax melting speed.

[0081] Specifically, a laser displacement sensor 22 and a float 25 are used to detect the level of the wax liquid.

[0082] A float 25 is positioned on one side of the wax melting tank 12. The float 25 floats with the liquid level and moves up and down along the guide rod 24 according to the liquid level. A laser displacement sensor 22 is positioned above the float 25, detecting the position of the float 25 and feeding it back to the control unit 4.

[0083] The guide rod 24 is provided with a limiting structure for the float 25. The uppermost position of the float 25 is limited by the snap ring 26, and the lowermost position of the float 25 is limited by the lower plate of the mounting bracket 23 to prevent the float 25 from falling out of the guide rod 24.

[0084] Step 2 specifically includes:

[0085] The liquid level regulating unit 3 regulates the liquid level height, specifically including:

[0086] The control unit 4 receives the height data of the float 25 from the laser displacement sensor 22, obtains the liquid level height, calculates the movement direction and movement distance of the balance block 38 based on the liquid level height, starts the servo motor 31 of the sliding module, and drives the slider 39 and the balance block 38 to move to adjust the liquid level height.

[0087] The movement direction of the balance block 38 is as follows: when the liquid level is detected to be lower than the target value and the difference is greater than the allowable value, the slide module 32 is controlled to drive the balance block 38 to move downward, so that the wax liquid level rises; when the liquid level is detected to be higher than the target value and the difference is greater than the allowable value, the slide module 32 is controlled to drive the balance block 38 to move upward, so that the wax liquid level drops, ensuring that the liquid level height is controlled within the allowable range.

[0088] Furthermore, the distance x that the balance block 38 moves is calculated according to the formula x=ΔT×S1 / S2;

[0089] Wherein, S1 is the average effective area of ​​the wax melting pool 12, in m². 2 S2 is the effective area of ​​balance block 38, in m². 2 ΔT represents the deviation between the target value and the measured value, in meters (m).

[0090] The measured value is the average value calculated after removing abnormal data, based on the time interval between stable intervals of the liquid level data detected by multiple sets of laser displacement sensors 22.

[0091] like Figure 6 As shown, specifically, the liquid level adjustment process is as follows:

[0092] The liquid level adjustment unit 3 is started, the laser displacement sensor 22 detects the liquid level value, and calculates the difference ΔT between the measured value and the target value; if the difference is not within the allowable value A, the servo adjustment amount is calculated, and the liquid level adjustment system is controlled to move at a speed V according to the adjustment amount; if the difference is within the allowable value A, the laser displacement sensor 22 repeatedly detects the liquid level value.

[0093] The method for detecting liquid level values ​​using the laser displacement sensor 22 specifically includes:

[0094] Start measurement unit 2, laser displacement sensor 22 measures n times, with an interval of s seconds between each measurement, and records the data; remove the maximum and minimum values, calculate the average value of the remaining recorded data, and output the currently detected liquid level value.

[0095] During the movement of the slide module 32, the position of the slider 39 is detected in real time by the photoelectric sensor 33, and the displacement signal is fed back to the control unit. The first photoelectric sensor 33 and the second photoelectric sensor 33 respectively detect whether the slider 39 exceeds the upper limit and the lower limit, and the third photoelectric sensor 33 detects the current position of the slider 39; the sensing bracket 34 is set on the slider 39 to sense the position of the slider 39.

[0096] In this embodiment, the liquid level is measured by a combination of a float 25 and a laser displacement sensor 22. The slide module 32 drives the slider 39 and the balance block 38 to move and adjust the liquid level, so that the liquid level can be dynamically compensated in real time and the liquid level can be kept stable. This improves the response accuracy and reliability of the liquid level adjustment, thus solving the problem of uneven wax application caused by the inability to maintain the liquid level within the set value range.

[0097] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A liquid level control device for an automatic bonding process of wax mold modules, characterized in that, It includes a wax-dissolving unit (1), a measuring unit (2), and a liquid level regulating unit (3); The wax melting unit (1) is used to heat and melt the adhesive wax into a liquid state; the measuring unit (2) is used to measure the height of the wax liquid in the wax melting unit (1); the liquid level regulating unit (3) adjusts the liquid level in real time according to the measurement value of the measuring unit (2).

2. The liquid level control device for automatic bonding process of wax mold modules according to claim 1, characterized in that, The wax melting unit (1) includes a wax melting tank (12); the wax melting tank (12) is used to hold liquid wax.

3. The liquid level control device for automatic bonding process of wax mold modules according to claim 2, characterized in that, The wax melting tank (12) has an automatic temperature control system, which is used to control the temperature of the wax liquid in the wax melting tank (12).

4. The liquid level control device for automatic bonding process of wax mold modules according to claim 2, characterized in that, The wax melting unit (1) also includes a tray (11); the tray (11) is located below the wax melting pool (12) and is used to receive the wax liquid leaked from the wax melting pool (12).

5. The liquid level control device for automatic bonding process of wax mold modules according to claim 2, characterized in that, The wax melting unit (1) also includes an aluminum block (13), which is embedded in the bottom of the wax melting pool (12).

6. The liquid level control device for automatic bonding process of wax mold modules according to claim 1, characterized in that, The liquid level regulating unit (3) includes a servo module.

7. The liquid level control device for automatic bonding process of wax mold modules according to claim 6, characterized in that, The servo module includes a servo motor (31), a slide module (32), and a slider (39).

8. The liquid level control device for automatic bonding process of wax mold modules according to claim 7, characterized in that, The slider (39) is mounted on the slide module (32), and the servo motor (31) drives the slider (39) to rise and fall.

9. The liquid level control device for automatic bonding process of wax mold modules according to claim 1, characterized in that, It also includes a control unit (4).

10. A method for controlling the liquid level height in an automatic bonding process for wax mold modules, characterized in that, The liquid level control device for automatic bonding process of wax mold modules according to any one of claims 1-9 includes the following steps: Step 1: The wax melting unit (1) heats and melts the adhesive wax, and the measuring unit (2) detects the height of the wax liquid level; Step 2: The control unit (4) receives the liquid level height data, and the liquid level adjustment unit (3) adjusts the liquid level height.

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