Numerically controlled planer-type milling machine

Abstract

The application discloses a numerical control gantry milling machine and belongs to the technical field of machine tools, which comprises a bearing plate, a linear module fixedly installed on the upper surface of the bearing plate, a bearing plate fixedly installed on the upper surface of a moving block of the linear module, gantry frames fixedly installed at both ends of the upper surface of the bearing plate, a liquid collecting and spraying mechanism fixedly installed between the upper halves of the two sets of gantry frames, and a cooling mechanism fixedly installed between the lower halves of the two sets of gantry frames and connected with the liquid outlet end of the liquid collecting and spraying mechanism. The application realizes a high-efficiency cooling liquid closed-loop circulation system through the design of the cooling mechanism and the liquid collecting and spraying mechanism, reduces the material cost and environmental protection pressure, guarantees the stable cooling effect, and realizes the accurate cooling of the cutting area through the ball tube rotation adjustment and the double-path nozzle design.

Description

Technical Field

[0001] This invention relates to the field of machine tool technology, specifically to a CNC gantry milling machine. Background Technology

[0002] In the field of modern machining, CNC gantry milling machines are key equipment for machining large and precision workpieces, and their performance directly affects machining efficiency, product accuracy, and production costs. As industrial manufacturing increasingly demands higher processing quality, environmental protection, energy conservation, and automation, the shortcomings of traditional CNC gantry milling machines in areas such as coolant recovery and utilization, cutting stability assurance, and thermal management efficiency are becoming increasingly apparent.

[0003] For example, patent CN223185616U discloses a gantry milling machine with quick tool changing capability. The gantry milling machine body is equipped with a spindle box, and a drive shaft is rotatably mounted on the bottom of the spindle box. A detachable mounting sleeve is mounted on the drive shaft, and a milling cutter assembly is mounted on the bottom of the mounting sleeve. Multiple mounting parts for engaging the mounting sleeve are movably arranged on the bottom of the drive shaft. Each mounting sleeve has a corresponding mounting cavity on its mounting part, and a mounting sleeve is rotatably mounted on the outer side of the mounting sleeve. Through the engaging and fitting of the mounting parts and mounting cavities, the mounting sleeve can be assembled onto the drive shaft. This assembly method is quick and convenient, requiring no external auxiliary tools, allowing users to quickly change the milling cutter assembly on the gantry milling machine body, facilitating user operation.

[0004] However, while the aforementioned gantry milling machine with rapid tool change solves the problem of quick cutter replacement, it does not address the recycling of coolant and the design of an efficient cooling system, thus having the following shortcomings:

[0005] 1. During the processing, the coolant is mostly used once or simply filtered and then circulated. There is no dedicated metal slag filtration mechanism, which makes the metal shavings mixed in the coolant prone to causing wear on the milling cutter and scratches on the workpiece surface. At the same time, the coolant needs to be replaced frequently, which increases production costs.

[0006] 2. The lack of adaptive clamping devices for workpieces of different sizes makes it easy for large workpieces to vibrate during high-speed cutting, affecting machining accuracy. This is especially true for irregularly shaped or thin-walled parts, where traditional fixing methods cannot guarantee clamping stability.

[0007] 3. The circulating coolant was not cooled efficiently. The heat generated by continuous cutting caused the coolant temperature to rise, reducing its cooling effect. This not only affected the workpiece processing quality, but may also shorten the service life of key equipment components due to overheating.

[0008] 4. The coolant spraying position is fixed and cannot be adjusted in real time according to the milling cutter position and cutting area. Some areas are not cooled sufficiently, while some areas are over-sprayed, resulting in waste. It is difficult to meet the processing requirements of complex workpieces. Summary of the Invention

[0009] The purpose of this invention is to provide a CNC gantry milling machine to solve the problems mentioned in the background art, such as low circulation rate of milling machine coolant, incomplete filtration of metal chips, insufficient workpiece clamping stability, poor heat dissipation effect of coolant, and inflexible adjustment of spray position.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A CNC gantry milling machine includes: a support plate, a linear module fixedly mounted on the upper surface of the support plate, a receiving plate fixedly mounted on the upper surface of the moving block of the linear module, a filter plate rotatably mounted on one end of the inner upper half of the receiving plate with a sloping bottom, a lug fixedly mounted on the upper surface of the other end of the filter plate, the lug being slidably inserted by a pin to make the filter plate horizontal within the receiving plate, the pin being slidably mounted in a guide cylinder, and the guide cylinder being fixedly mounted on both ends of the upper surface of the receiving plate;

[0012] The upper surface of the bearing plate is fixedly mounted with gantry frames at both ends, and a cross slide is fixedly mounted at one end of the upper half of the two sets of gantry frames. A cutting motor is fixedly mounted at one end of the moving block of the cross slide. The cutting motor can be perpendicular to the filter screen plate, and a liquid collection spraying mechanism is fixedly mounted between the upper halves of the two sets of gantry frames.

[0013] The lower surface of the liquid collection end of the liquid collection and spraying mechanism is connected to the liquid outlet end of the cooling mechanism. The cooling mechanism is fixedly installed between the lower halves of the two gantry frames. The liquid inlet end of the cooling mechanism is connected to the insertion port. The insertion port is opened at one end of the receiving plate, so that the receiving plate can receive the coolant when the cutting motor is performing cutting operations and be sucked into the cooling mechanism through the insertion port.

[0014] Preferably, guide rails are fixedly installed at both ends of the upper surface of the receiving plate, and U-shaped frames are slidably installed on the outer surfaces of the two sets of guide rails. An L-shaped frame is rotatably installed at one end of the U-shaped frame, and a first wing bolt is threaded onto one end of the L-shaped frame. The threaded part of the first wing bolt passes through the lower surface of the L-shaped frame, and a rubber pad is fixedly installed on the lower surface. One end of the bent part of the L-shaped frame is rotatably connected to the piston rod of the electric push rod, and the electric push rod is rotatably installed at the other end of the U-shaped frame.

[0015] Preferably, the electric push rod can push or pull the L-shaped frame by extending or retracting the piston rod, causing the rubber pad on the lower surface of the first butterfly bolt to press against the surface of the workpiece being cut.

[0016] Preferably, the cooling mechanism includes a connecting cylinder, which is inserted into the insertion port and sealed to it. The other end of the outer surface of the connecting cylinder inserted into the insertion port is covered by a limiting plate, thereby confining the connecting cylinder in the insertion port. The limiting plate covering the outer surface of the connecting cylinder can be locked by bolts.

[0017] Preferably, a metal filter element is fixedly installed inside the connecting cylinder, so that the metal filter element can filter the metal slag in the coolant collected by the receiving plate. The part of the outer surface of the connecting cylinder that is not covered is connected to the liquid inlet of the copper pipe. The copper pipe is bent and fixedly installed inside the cooling box. The cooling box is fixedly installed in the lower half between the two sets of gantry frames. The liquid outlet at the other end of the copper pipe is connected to the liquid inlet of the first water pump. The first water pump is fixedly installed at one end of one set of gantry frames. The liquid outlet of the first water pump is connected to the liquid collection end of the liquid collection spraying mechanism.

[0018] Preferably, the outer surface of the copper tube is fitted with fins and fixedly installed inside the cooling box.

[0019] Preferably, one end of the cooling box has an annular opening, and a barrier mesh is installed inside the annular opening. A brushless motor is fixedly installed inside the barrier mesh, and a fan blade is fixedly installed at one end of the output shaft of the brushless motor. The fan blade is located at the center of the copper tube and fins through the annular opening. The other end of the cooling box has an exhaust port, so that the rotating fan blade can be discharged from the exhaust port after blowing the copper tube and fins.

[0020] Preferably, the liquid collection and spraying mechanism includes a liquid collection tank, which is fixedly installed in the upper part between two sets of gantry frames and connected to the outlet of the first water pump. A second water pump is fixedly installed at one end of the liquid collection tank, and the inlet of the second water pump is connected to the lower surface of the liquid collection tank. A three-way pipe is connected to one end of the outlet of the second water pump.

[0021] Preferably, one end of each of the other two sets of pipe openings of the tee is connected to a corrugated pipe, and one end of the corrugated pipe is connected to a ball tube. The ball tube is rotatably installed in a ball groove, which is located within a U-shaped plate. The U-shaped plate is fixedly installed at both ends of the housing of the cross slide table and at both ends of the cutting motor. The other end of the ball tube is connected to a nozzle, so that the nozzle can rotate through the ball tube in the ball groove to be opposite to the milling cutter of the cutting motor and the cutting area of ​​the workpiece.

[0022] Preferably, a second butterfly bolt is rotatably mounted on one end of the outer surface of the U-shaped plate. The threaded portion of the second butterfly bolt is threaded through the ball groove and can contact the outer surface of the ball tube to achieve position locking.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The position of the U-shaped frame is adjusted by sliding along the guide rail. Combined with the electric push rod and the first butterfly bolt, the stable clamping of workpieces of different sizes and shapes can be completed quickly without disassembling the fixture. The filter screen is quickly fixed and disassembled by the pin and the lug. When cleaning, pulling the pin will automatically tilt the screen, eliminating complicated disassembly steps, greatly shortening the auxiliary time for clamping and debris cleaning, and improving the continuous operation capability of the equipment.

[0025] 2. Construct a two-stage purification system of "preliminary filtration by filter screen + fine filtration by metal filter element" to avoid metal debris from abrading pipes, milling cutters, or scratching workpieces. At the same time, through a high-efficiency heat dissipation structure composed of bent copper tubes, fins, and brushless motor fan blades, the coolant temperature is quickly reduced, ensuring stable cooling effect and realizing closed-loop recycling of coolant. This reduces the cost of consumable replacement and waste liquid discharge, taking into account both economy and environmental protection.

[0026] 3. By adjusting the multi-angle rotation of the ball tube within the ball groove, and with the second butterfly bolt locking and positioning, the nozzle can be precisely aligned with the cutting area. Furthermore, the dual-path spray design and the flexible adaptation of the bellows can expand the cooling coverage area and adapt to different cutting scenarios, avoiding machining errors caused by insufficient local cooling. This ensures that the milling cutter and workpiece are always in a state of efficient cooling, improving machining accuracy and the service life of the milling cutter.

[0027] 4. The connecting cylinder in the cooling mechanism is quickly locked with a limit plate and bolts. Replacing the metal filter element only requires removing the limit plate, without disassembling the cooling box. The core components have no complex splicing structure, and no special tools are required for maintenance, which greatly reduces equipment downtime, reduces operation and maintenance difficulty and cost, and further improves the overall utilization rate of the equipment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the gantry structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the overall side cross-section of the present invention;

[0031] Figure 4 This is a schematic diagram of the receiving plate and insertion port of the present invention;

[0032] Figure 5This is a schematic diagram of the structure of the copper tube and fins of the present invention;

[0033] Figure 6 This is a schematic diagram of the cooling mechanism of the present invention;

[0034] Figure 7 This is a schematic diagram of the liquid collection and spraying mechanism of the present invention.

[0035] In the diagram: 1. Bearing plate; 101. Linear module; 102. Receiving plate; 103. Guide rail; 104. Filter plate; 105. Guide cylinder; 106. Pin; 107. Insertion lug; 108. Cross slide; 109. Insertion port; 110. Limiting plate; 111. Cutting motor; 112. Gantry frame; 113. U-shaped frame; 114. L-shaped frame; 115. First wing bolt; 116. Electric push rod; 2. Cooling mechanism; 20 1. Connecting cylinder; 202. Metal filter element; 203. Cooling box; 204. Barrier mesh; 205. Brushless motor; 206. Fan blade; 207. Copper pipe; 208. Fin; 209. First water pump; 3. Liquid collection and spraying mechanism; 301. Liquid collection tank; 302. Second water pump; 303. T-pipe; 304. Corrugated pipe; 305. Ball tube; 306. Nozzle; 307. U-shaped plate; 308. Ball groove; 309. Second wing bolt. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-7 This embodiment provides the following technical solution:

[0038] like Figures 1-3 As shown, a CNC gantry milling machine includes: a support plate 1, a linear module 101 fixedly mounted on the upper surface of the support plate 1, a receiving plate 102 fixedly mounted on the upper surface of the moving block of the linear module 101, a filter plate 104 rotatably mounted on one end of the inner upper half of the receiving plate 102 with a sloping bottom, and a lug 107 fixedly mounted on the upper surface of the other end of the filter plate 104. The lug 107 can be slidably inserted by a pin 106, so that the filter plate 104 is horizontal in the receiving plate 102. The pin 106 is slidably mounted in a guide cylinder 105, and the guide cylinder 105 is fixedly mounted on both ends of the upper surface of the receiving plate 102.

[0039] Among them, gantry frames 112 are fixedly installed at both ends of the upper surface of the bearing plate 1, and cross slides 108 are fixedly installed at one end of the upper half of the two sets of gantry frames 112. A cutting motor 111 is fixedly installed at one end of the moving block of the cross slide 108. The cutting motor 111 can be perpendicular to the filter screen plate 104, and a liquid collection spraying mechanism 3 is fixedly installed between the upper halves of the two sets of gantry frames 112.

[0040] The lower surface of the liquid collection end of the liquid collection spraying mechanism 3 is connected to the liquid outlet end of the cooling mechanism 2. The cooling mechanism 2 is fixedly installed between the lower halves of the two sets of gantry frames 112. The liquid inlet end of the cooling mechanism 2 is connected to the insertion port 109. The insertion port 109 is opened at one end of the receiving plate 102, so that the receiving plate 102 can receive the coolant when the cutting motor 111 is performing cutting operations and be sucked into the cooling mechanism 2 through the insertion port 109.

[0041] The upper surface of the receiving plate 102 is fixedly mounted with guide rails 103 at both ends. The outer surfaces of the two sets of guide rails 103 are slidably mounted with U-shaped frames 113. An L-shaped frame 114 is rotatably mounted inside one end of the U-shaped frame 113. A first wing bolt 115 is threaded onto one end of the L-shaped frame 114. The threaded part of the first wing bolt 115 passes through the threaded part of the lower surface of the L-shaped frame 114, and a rubber pad is fixedly mounted on the lower surface. One end of the bent part of the L-shaped frame 114 is rotatably connected to the piston rod of the electric push rod 116. The electric push rod 116 is rotatably mounted inside the other end of the U-shaped frame 113.

[0042] Among them, the electric push rod 116 can push or pull the L-shaped frame 114 through the extension and retraction of the piston rod, so that the rubber pad on the lower surface of the first butterfly bolt 115 presses against the surface of the workpiece being cut.

[0043] Through the design of the receiving plate 102, guide rail 103, filter plate 104, pin 106, insertion port 109, U-shaped bracket 113, L-shaped bracket 114, first wing bolt 115, electric push rod 116, cooling mechanism 2, and liquid collection spraying mechanism 3, when the CNC gantry milling machine is performing cutting operations, the filter plate 104 is rotated to a horizontal state around the rotation point of the upper half of the receiving plate 102. Then, the pin 106 in the guide cylinder 105 is pushed to slide into the insertion lug 107 at the other end of the filter plate 104, thereby fixing the filter plate 104 horizontally within the receiving plate 102. Then, the workpiece can be placed on the surface of the filter plate 104, and the U-shaped bracket 113 is pushed according to the size of the workpiece. 13. Slide along the guide rail 103 on the upper surface of the receiving plate 102 to the appropriate clamping position, and then start the electric push rod 116 to extend and retract its piston rod to push the L-shaped frame 114 to rotate around the rotation point inside the U-shaped frame 113. The L-shaped frame 114, which is pushed and rotated, can drive the rubber pad on the lower surface of the first wing bolt 115 at the other end to press against the surface of the workpiece. Before clamping the workpiece, the operator can adjust the extension length of the rubber pad on the lower surface of the threaded part by rotating the first wing bolt 115. Through the flexible contact of the rubber pad with the thread of the first wing bolt 115, combined with the pushing force of the electric push rod 116, the stable clamping of workpieces of different sizes and shapes is achieved.

[0044] After clamping, the linear module 101 is activated, and its moving block moves the receiving plate 102 and the clamped workpiece to a machining position perpendicular to the cutting motor 111. Simultaneously, the cutting motor 111 is activated to perform cutting operations. During this process, the liquid spraying mechanism 3 operates and sprays coolant onto the cutting area to cool the milling cutter and the workpiece. The sprayed coolant carries metal debris onto the filter plate 104 inside the receiving plate 102, where the filter plate 104 performs preliminary filtration of the metal debris. The filtered coolant then flows along the inclined surface at the bottom of the receiving plate 102 to the insertion device. At port 109, the cooling mechanism 2 is then activated and draws in the coolant filtered from the receiving plate 102 through the insertion port 109. The cooling mechanism 2 cools the drawn-in coolant and then delivers the cooled coolant to the collection end of the liquid collection and spraying mechanism 3. The liquid collection and spraying mechanism 3 then sprays the coolant back onto the cutting area, forming a recycling of the coolant. During this process, the coolant can maintain a low-temperature cooling effect, prevent the processing quality from deteriorating and the key components of the equipment from overheating due to the rise in coolant temperature, and significantly reduce the frequency of coolant replacement, reduce consumable costs, and reduce waste liquid discharge.

[0045] Once the workpiece is cut and removed, the pin 106 can be pulled to disengage it from the lug 107, causing the filter plate 104 to automatically rotate downwards around the pivot point under gravity, tilting and touching the lower inner surface of the receiving plate 102. Then, workers can brush off the metal debris along the filter holes on the filter plate 104. Alternatively, the filter plate 104 can be flipped upwards to clean the inside of the receiving plate 102. After cleaning, the filter plate 104 is re-fixed to continue the cutting operation.

[0046] like Figures 4-6 As shown, the cooling mechanism 2 includes a connecting cylinder 201, which is inserted into the insertion port 109 and sealed to it. The other end of the outer surface of the connecting cylinder 201 inserted into the insertion port 109 is covered by a limiting plate 110, thereby confining the connecting cylinder 201 in the insertion port 109. The limiting plate 110 covering the outer surface of the connecting cylinder 201 can be locked by bolts.

[0047] A metal filter element 202 is fixedly installed inside the connecting cylinder 201, allowing it to filter metal slag from the coolant collected by the receiving plate 102. The uncovered portion of the outer surface of the connecting cylinder 201 is connected to the inlet of the copper pipe 207. The copper pipe 207 is curved and fixedly installed inside the cooling box 203, which is fixedly installed in the lower half between the two sets of gantry frames 112. The outlet of the other end of the copper pipe 207 is connected to the inlet of the first water pump 209, which is fixedly installed at one end of one set of gantry frames 112. The outlet of the first water pump 209 is connected to the collection end of the liquid collection spraying mechanism 3. Fins 208 are fitted onto the outer surface of the copper pipe 207 and fixedly installed inside the cooling box 203.

[0048] The cooling box 203 has an annular opening at one end, and a barrier mesh 204 is installed inside the annular opening. A brushless motor 205 is fixedly installed inside the barrier mesh 204. A fan blade 206 is fixedly installed at one end of the output shaft of the brushless motor 205. The fan blade 206 is located at the center of the copper tube 207 and the fins 208 through the annular opening. The cooling box 203 has an exhaust port at the other end, so that the rotating fan blade 206 can be discharged from the exhaust port after blowing the copper tube 207 and the fins 208.

[0049] Through the design of the connecting cylinder 201, metal filter element 202, cooling box 203, barrier mesh 204, brushless motor 205, fan blade 206, copper pipe 207, fins 208, and first water pump 209, when the cooling mechanism 2 is working, the first water pump 209 first generates suction to draw the coolant, which has been preliminarily filtered by the filter mesh plate 104 in the receiving plate 102, into the connecting cylinder 201 through the insertion port 109. At this time, the metal filter element 202 in the connecting cylinder 201 will perform secondary filtration on the fine metal residue remaining in the coolant to prevent fine metal residue from being filtered out. Debris entering subsequent pipelines with the coolant can cause blockages or wear on components. To ensure the cleanliness of the circulating coolant, the coolant, filtered by the metal filter element 202, flows into the inlet of the copper pipe 207, which is connected to the connecting cylinder 201. Because the copper pipe 207 is bent and fixedly installed inside the cooling box 203, and its outer surface is fitted with fins 208, the coolant makes full contact with the copper pipe 207 and fins 208 as it flows through the bent copper pipe 207. Simultaneously, the brushless motor 205, fixed to the baffle mesh 204 within the annular opening of the cooling box 203, is activated. The output shaft of the brush motor 205 drives the fan blades 206 to rotate. The airflow generated by the fan blades 206 sweeps the copper tube 207 and fins 208 located in the center. The airflow quickly removes heat from the coolant inside the copper tube 207, thus cooling the coolant. The swept airflow is then discharged from the exhaust port at the other end of the cooling box 203. This combined design of "extended flow path + increased heat dissipation area + active air cooling" avoids the problem of coolant overheating and reduced cooling effect caused by continuous cutting, effectively suppressing thermal deformation of the workpiece during processing. To prevent high-temperature coolant from causing thermal damage to critical components of the equipment, the cooled coolant eventually flows from the outlet of copper pipe 207 into the inlet of the first water pump 209. The first water pump 209 then delivers the cooled coolant to the collection end of the liquid collection and spraying mechanism 3, providing low-temperature coolant for subsequent cooling of the cutting area. At the same time, the connecting cylinder 201 slides through the limit plate 110 and is bolted into the insertion port 109, ensuring a sealed connection between the connecting cylinder 201 and the insertion port 109 and preventing coolant leakage during transportation.

[0050] like Figure 7 As shown, the liquid collection and spraying mechanism 3 includes a liquid collection tank 301. The liquid collection tank 301 is fixedly installed in the upper part between the two sets of gantry frames 112 and is connected to the outlet of the first water pump 209. A second water pump 302 is fixedly installed at one end of the liquid collection tank 301. The inlet of the second water pump 302 is connected to the lower surface of the liquid collection tank 301. A three-way pipe 303 is connected to one end of the outlet of the second water pump 302.

[0051] The other two sets of ports of the three-way pipe 303 are each connected to a bellows 304 at one end. One end of the bellows 304 is connected to a ball tube 305, which is rotatably installed in a ball groove 308. The ball groove 308 is located within a U-shaped plate 307, which is fixedly installed at both ends of the housing of the cross slide table 108 and at both ends of the cutting motor 111. The other end of the ball tube 305 is connected to a nozzle 306, allowing the nozzle 306 to rotate through the ball tube 305 in the ball groove 308 to be aligned with the milling cutter of the cutting motor 111 and the cutting area of ​​the workpiece. A second wing bolt 309 is rotatably installed on one end of the outer surface of the U-shaped plate 307. The threaded portion of the second wing bolt 309 extends into the ball groove 308 and can abut against the outer surface of the ball tube 305 to achieve position locking.

[0052] Through the design of the liquid collection tank 301, the second water pump 302, the three-way pipe 303, the corrugated pipe 304, the ball pipe 305, the nozzle 306, the ball groove 308, and the second wing bolt 309, when the liquid collection and spraying mechanism 3 is working, the first water pump 209 first transports the coolant processed by the cooling mechanism 2 to the liquid collection tank 301 for temporary storage. The liquid collection tank 301 can stabilize the supply pressure of the coolant and avoid unstable spraying due to fluctuations in the supply of the cooling mechanism 2. Then, the second water pump 302 is started, and its inlet draws coolant from the lower surface of the liquid collection tank 301, and then transports the coolant to the three-way pipe 303 through the outlet. After being diverted by the three-way pipe 303, the coolant enters the two sets of corrugated pipes 304 respectively. Because the corrugated pipe 304 has flexible characteristics, it can flexibly adjust its shape with the rotation of the ball pipe 305 without affecting the cooling. Coolant is delivered through a bellows 304 into a ball tube 305 and finally sprayed out from a nozzle 306. Before spraying, the operator can rotate the ball tube 305 in the ball groove 308 within the U-shaped plate 307 according to the position of the milling cutter on the cutting motor 111 and the angle of the workpiece being cut, so that the nozzle 306 is aligned with the cutting area. After adjustment, the second wing bolt 309 on the outer surface of the U-shaped plate 307 is tightened so that its threaded part contacts the outer surface of the ball tube 305 to lock the position, ensuring that the nozzle 306 will not shift due to equipment vibration or coolant impact during spraying. Thus, coolant is accurately sprayed from both ends of the cutting motor 111 to the cutting area through two sets of nozzles 306, which can accelerate the removal of heat generated by cutting, reduce the accuracy error caused by thermal deformation of the workpiece, and achieve efficient cooling of the milling cutter and the workpiece.

[0053] Among them, the coolant outlet temperature T of cooling mechanism 2 out Calculated using the following formula:

[0054] ;

[0055] in:

[0056] T inThis refers to the coolant inlet temperature.

[0057] T air Ambient air temperature;

[0058] This refers to the coolant mass flow rate.

[0059] c p This refers to the specific heat capacity of the coolant.

[0060] h0 is the baseline heat transfer coefficient;

[0061] A0 is the baseline heat dissipation area;

[0062] D is the inner diameter of the 207 copper tube;

[0063] R c The average bending radius of the 207 copper tube;

[0064] A fin This represents the total heat dissipation area of ​​fin 208;

[0065] A tube This refers to the outer surface area of ​​copper tube 207;

[0066] α and β are enhancement coefficients, which were determined experimentally.

[0067] The derivation of this equation is as follows:

[0068] This equation is derived based on the NTU (number of transfer units) method in heat exchanger theory. For cooling mechanism 2, the coolant flows inside the curved copper tube 207, the fins 208 expand the heat dissipation area, and the fan blades 206 provide forced convection. The energy balance equation is:

[0069] ;

[0070] Where ΔT lm This is the logarithmic mean temperature difference. Due to the temperature variation between the coolant and air, an approximation is used for simplification:

[0071] ;

[0072] Combining the above equations, we can solve for:

[0073] ;

[0074] in To highlight the features of the invention, an enhancement factor F is introduced to quantify the contributions of the bent copper tube and fins:

[0075] ;

[0076] α and β were calibrated experimentally. Finally, the effective NTU is expressed as:

[0077] ;

[0078] Substituting the values ​​will give you the equation.

[0079] Example: Measure the coolant inlet temperature T while the CNC gantry milling machine is running. in =50℃, ambient air temperature T air =25℃, coolant mass flow rate =0.1kg / s, specific heat capacity. Based on the copper tube parameters: inner diameter D=0.01m, bending radius R c =0.05m, fin area A fin =0.5m 2 The outer surface area A of the copper tube tube =0.1m 2 Given a baseline h0A0 = 100 W / K, enhancement factors α = 0.1 and β = 0.2, calculate the enhancement factor:

[0080] ;

[0081] Substitute into the equation:

[0082]

[0083] The coolant outlet temperature is approximately 40.5℃, and the temperature drop of 9.5℃ indicates that the cooling mechanism is working effectively.

[0084] Parameter description:

[0085] T in T out T air Temperature units (such as °C or K) can be measured by a temperature sensor.

[0086] Mass flow rate (kg / s) is determined by the flow rate of the first water pump 209.

[0087] c p Specific heat capacity (J / (kg·K)) depends on the type of coolant.

[0088] h0: Reference heat transfer coefficient (W / (m²)) 2 ·K), based on the standard value of straight copper tubes in air.

[0089] A0: Base heat dissipation area (m²) 2 ), the surface area of ​​the straight copper tube.

[0090] D: Inner diameter of copper tube (m), design parameter.

[0091] R cAverage bending radius of copper pipe (m), describing the degree of bending.

[0092] A fin Total heat dissipation area of ​​fins (m²) 2 ), including all fin areas.

[0093] A tube : Outer surface area of ​​copper tube (m²) 2 (excluding fins).

[0094] α: Bending reinforcement coefficient, dimensionless, determined by bending tube experiments.

[0095] β: Fin reinforcement coefficient, dimensionless, determined through fin efficiency experiments.

[0096] Technical effects:

[0097] This equation quantitatively describes the cooling efficiency of the cooling mechanism, and the enhancement factor F reflects the strengthening effect of the bent copper tube and fins on heat transfer.

[0098] It allows for the optimization of parameters (such as bending radius, fin area, fan speed) to maximize cooling effect and ensure stable coolant temperature.

[0099] By combining a closed-loop circulation system, the frequency of coolant replacement is reduced, consumable costs and environmental pressure are decreased, while machining accuracy and tool life are improved.

[0100] Working principle and process:

[0101] 1. Coolant flows from the receiving plate 102 into the cooling mechanism 2 through the insertion port 109.

[0102] 2. After the metal filter element 202 filters out metal debris, the coolant enters the bent copper tube 207.

[0103] 3. The brushless motor 205 drives the fan blades 206 to blow air, and the airflow passes through the fins 208 and copper tubes 207, carrying away heat.

[0104] 4. As the coolant temperature decreases, it is pumped into the liquid collection and spraying mechanism 3 by the first water pump 209 for circulation.

[0105] 5. The equation calculates T based on real-time parameters. out It is used to monitor and adjust cooling performance to ensure efficient heat dissipation.

[0106] Based on the above technical solution, the working steps of this solution are summarized as follows: When the CNC gantry milling machine is performing cutting operations, the filter plate 104 is rotated to a horizontal position around the rotation point of the upper half of the receiving plate 102. Then, the pin 106 in the guide cylinder 105 is pushed into the lug 107 at the other end of the filter plate 104, thereby fixing the filter plate 104 horizontally within the receiving plate 102. Then, the workpiece can be placed on the surface of the filter plate 104. According to the size of the workpiece, the U-shaped frame 113 is pushed to slide along the guide rail 103 on the upper surface of the receiving plate 102 to the appropriate clamping position. Then, the electric push rod 116 is activated, causing its piston rod to extend and retract to push the L-shaped frame 114 to rotate around the rotation point within the U-shaped frame 113. The L-shaped bracket 114 can drive the rubber pad on the lower surface of the first wing bolt 115 at the other end to press against the surface of the workpiece. After clamping, the linear module 101 is then started. Its moving block drives the receiving plate 102 and the clamped workpiece to a processing position perpendicular to the cutting motor 111. At the same time, the cutting motor 111 is started to perform cutting operations. During this period, the second water pump 302 is started. Its inlet draws coolant from the lower surface of the liquid collection tank 301, and then delivers the coolant to the three-way pipe 303 through the outlet. After being diverted by the three-way pipe 303, the coolant enters the two sets of bellows 304 respectively. Because the bellows 304 has flexible characteristics, it can flexibly adjust its shape with the rotation of the ball tube 305 without affecting the delivery of coolant. Then the coolant passes through The corrugated pipe 304 flows into the ball tube 305 and is finally sprayed out from the nozzle 306. Before spraying, the operator can rotate the ball tube 305 in the ball groove 308 within the U-shaped plate 307 according to the position of the milling cutter on the cutting motor 111 and the angle of the workpiece being cut, so that the nozzle 306 is aligned with the cutting area. After adjustment, the second wing bolt 309 on the outer surface of the U-shaped plate 307 is tightened so that its threaded part contacts the outer surface of the ball tube 305 to lock the position, ensuring that the nozzle 306 will not shift due to equipment vibration or coolant impact during spraying. Thus, coolant is precisely sprayed from both ends of the cutting motor 111 to the cutting area through two sets of nozzles 306, which can accelerate the removal of heat generated by cutting and achieve efficient cooling of the milling cutter and workpiece. The coolant carries metal debris onto the filter plate 104 inside the receiving plate 102. The filter plate 104 performs initial filtration of the metal debris. The filtered coolant flows along the inclined surface at the bottom of the receiving plate 102 to the insertion port 109. During this process, the first water pump 209 is activated to draw coolant from the insertion port 109 into the connecting cylinder 201. At this time, the metal filter element 202 inside the connecting cylinder 201 performs secondary filtration of the fine metal residue remaining in the coolant, preventing fine debris from entering subsequent pipelines with the coolant and causing blockage or wear on components. At the same time, it ensures the cleanliness of the circulating coolant. The coolant filtered by the metal filter element 202 flows into the inlet of the copper pipe 207, which is connected to the connecting cylinder 201. Since the copper pipe 207 is bent and fixedly installed inside the cooling tank 203,Furthermore, fins 208 are fitted onto the outer surface. When the coolant flows within the curved copper tube 207, it makes full contact with the copper tube 207 and the fins 208. Simultaneously, the brushless motor 205, fixed within the baffle mesh 204 inside the annular opening of the cooling box 203, is activated. The output shaft of the brushless motor 205 drives the fan blades 206 to rotate. The airflow generated by the fan blades 206 sweeps the copper tube 207 and fins 208 at the center, quickly removing heat from the coolant within the copper tube 207 through airflow, thus cooling the coolant. The swept airflow is then discharged from the exhaust port at the other end of the cooling box 203, and the cooled coolant finally exits from the outlet of the copper tube 207. The coolant flows into the inlet of the first water pump 209, which then pumps the cooled coolant to the collection tank 301 to provide low-temperature coolant for the subsequent cutting area. This continues until the workpiece is finished and removed. Afterwards, the filter plate 104 can be disengaged from the lug 107 by pulling the pin 106, causing it to automatically rotate downwards around the pivot point under gravity, tilting and contacting the lower inner surface of the receiving plate 102. Workers can then brush away metal debris through the filter holes on the filter plate 104. Alternatively, the filter plate 104 can be flipped upwards to clean the inside of the receiving plate 102. After cleaning, the filter plate 104 is re-fixed to continue the cutting operation.

[0107] In summary: relying on the combination of guide rail 103, electric push rod 116 and first wing bolt 115, stable clamping of workpieces of different sizes can be completed quickly. On the other hand, the construction of a closed-loop circulation system of coolant with "filter plate 104 + metal filter element 202" for secondary filtration and "bent copper tube 207 + fins 208 + brushless motor 205" for efficient heat dissipation not only reduces material costs and environmental pressure, but also ensures stable cooling effect. At the same time, precise cooling of the cutting area is achieved through the rotation adjustment of ball tube 305 and the design of dual nozzle 306.

[0108] All parts not described in this invention are the same as or can be implemented using existing technology. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC gantry milling machine, characterized in that, include: A support plate (1) is provided, on the upper surface of which a linear module (101) is fixedly mounted. A receiving plate (102) is fixedly mounted on the upper surface of the moving block of the linear module (101). The bottom of the receiving plate (102) is inclined, and a filter plate (104) is rotatably mounted on one end of the upper half of the receiving plate (102). A nose (107) is fixedly mounted on the upper surface of the other end of the filter plate (104). The nose (107) can be slidably inserted by a pin (106) so that the filter plate (104) is horizontal in the receiving plate (102). The pin (106) is slidably mounted. The guide cylinder (105) is installed inside the guide cylinder (105), which is fixedly installed at both ends of the upper surface of the support plate (102); both ends of the upper surface of the support plate (1) are fixedly installed with gantry frames (112), and one end of the upper half of the two sets of gantry frames (112) is fixedly installed with a cross slide (108). One end of the moving block of the cross slide (108) is fixedly installed with a cutting motor (111). The cutting motor (111) can be perpendicular to the filter screen plate (104), and a liquid collection spraying mechanism (3) is fixedly installed between the upper halves of the two sets of gantry frames (112). The lower surface of the liquid collection end of the liquid collection spraying mechanism (3) is connected to the liquid outlet end of the cooling mechanism (2). The cooling mechanism (2) is fixedly installed between the lower halves of the two sets of gantry frames (112). The liquid inlet end of the cooling mechanism (2) is connected to the insertion port (109). The insertion port (109) is opened at one end of the receiving plate (102) so that the receiving plate (102) can receive the coolant when the cutting motor (111) is performing cutting operations and be sucked into the cooling mechanism (2) through the insertion port (109). The upper surface of the receiving plate (102) is fixedly mounted with guide rails (103) at both ends, and the outer surfaces of the two sets of guide rails (103) are slidably mounted with U-shaped frames (113). An L-shaped frame (114) is rotatably mounted inside one end of the U-shaped frame (113). A first wing bolt (115) is threaded onto one end of the L-shaped frame (114), and the threaded part of the first wing bolt (115) passes through the threaded part of the lower surface of the L-shaped frame (114), and a rubber pad is fixedly mounted on the lower surface. One end of the bent part of the L-shaped frame (114) is rotatably connected to the piston rod of the electric push rod (116), and the electric push rod (116) is rotatably mounted inside the other end of the U-shaped frame (113).

2. The CNC gantry milling machine according to claim 1, characterized in that: The electric push rod (116) can push or pull the L-shaped frame (114) by extending or retracting the piston rod, causing the rubber pad on the lower surface of the first butterfly bolt (115) to press against the surface of the workpiece being cut.

3. A CNC gantry milling machine according to claim 1, characterized in that: The cooling mechanism (2) includes a connecting cylinder (201), which is inserted into the insertion port (109) and sealed to it. The other end of the outer surface of the connecting cylinder (201) inserted into the insertion port (109) is covered by a limiting plate (110) to fix the connecting cylinder (201) in the insertion port (109). The limiting plate (110) covering the outer surface of the connecting cylinder (201) can be locked by bolts.

4. A CNC gantry milling machine according to claim 3, characterized in that: A metal filter element (202) is fixedly installed inside the connecting cylinder (201) so that the metal filter element (202) can filter the metal slag in the coolant collected by the receiving plate (102). The part of the outer surface of the connecting cylinder (201) that is not covered is connected to the liquid inlet of the copper pipe (207). The copper pipe (207) is bent and fixedly installed inside the cooling box (203). The cooling box (203) is fixedly installed in the lower half between the two sets of gantry frames (112). The liquid outlet of the other end of the copper pipe (207) is connected to the liquid inlet of the first water pump (209). The first water pump (209) is fixedly installed at one end of one set of gantry frames (112). The liquid outlet of the first water pump (209) is connected to the liquid collection end of the liquid collection spraying mechanism (3).

5. A CNC gantry milling machine according to claim 4, characterized in that: The outer surface of the copper tube (207) is fitted with fins (208) and fixedly installed inside the cooling box (203).

6. A CNC gantry milling machine according to claim 5, characterized in that: The cooling box (203) has an opening at one end, and a barrier mesh (204) is installed inside the opening. A brushless motor (205) is fixedly installed inside the barrier mesh (204). A fan blade (206) is fixedly installed at one end of the output shaft of the brushless motor (205). The fan blade (206) is located at the center of the copper tube (207) and the fins (208) through the opening. The cooling box (203) has an exhaust hole at the other end, so that the rotating fan blade (206) can be discharged from the exhaust hole after blowing the copper tube (207) and the fins (208).

7. A CNC gantry milling machine according to claim 6, characterized in that: The liquid collection and spraying mechanism (3) includes a liquid collection tank (301), which is fixedly installed in the upper part between two sets of gantry frames (112) and connected to the outlet of the first water pump (209). A second water pump (302) is fixedly installed at one end of the liquid collection tank (301). The inlet of the second water pump (302) is connected to the lower surface of the liquid collection tank (301), and a three-way pipe (303) is connected to one end of the outlet of the second water pump (302).

8. A CNC gantry milling machine according to claim 7, characterized in that: The other two sets of pipe openings of the three-way pipe (303) are connected to a corrugated pipe (304) at one end. A ball pipe (305) is connected to one end of the corrugated pipe (304). The ball pipe (305) is rotatably installed in a ball groove (308). The ball groove (308) is opened in a U-shaped plate (307). The U-shaped plate (307) is fixedly installed at both ends of the housing of the cross slide (108) and at both ends of the cutting motor (111). The other end of the ball pipe (305) is connected to a nozzle (306), so that the nozzle (306) can rotate through the ball pipe (305) in the ball groove (308) to be opposite to the milling cutter of the cutting motor (111) and the cutting part of the workpiece.

9. A CNC gantry milling machine according to claim 8, characterized in that: A second butterfly bolt (309) is rotatably mounted on one end of the outer surface of the U-shaped plate (307). The threaded part of the second butterfly bolt (309) is threaded through the ball groove (308) and can be locked in position by contacting the outer surface of the ball tube (305).

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