Automatic feeding device for a milling machine

Abstract

The application relates to an automatic feeding device of a milling machine and relates to the technical field of milling machine mechanisms, and comprises support frames, a transmission mechanism, a jacking and translating mechanism and a dust collecting mechanism, characterized in that the support frames are arranged at the lower portions of the two ends of the transmission mechanism respectively, the transmission mechanism is used for transmitting door frame strips for milling grooves, the jacking and translating mechanism is fixedly connected with the rear support frame through a stationary support plate, and the jacking and translating mechanism is located below the transmission mechanism. The high-precision closed-loop feedback system composed of a magnetostrictive displacement sensor and a magnetic ring is used for monitoring and controlling the jacking stroke of the air cylinder in real time, the accumulated stroke error caused by the self error or internal leakage of the air cylinder is effectively eliminated, and the stable guidance provided by the guide telescopic rod is combined, so that each jacking action can accurately lift and position the door frame strip to the same preset height, and the consistency of the machining precision is improved.

Description

Technical Field

[0001] This application relates to the technical field of milling machine machinery, and in particular to an automatic feeding device for a milling machine. Background Technology

[0002] As an important component of building doors and windows, door frame strips typically require milling to create lock holes, grooves, and other structures at their ends to meet installation and functional requirements. In the current production process, door frame strip workpieces must undergo loading, positioning, and clamping processes before milling. Currently, this process mainly relies on manual operation or simple auxiliary devices. Operators move individual door frame strips and place them on the loading device at the front of the milling machine's worktable. The loading device then transports the door frame strips to the lower end of the milling cutter on the milling machine's worktable for milling. However, the existing technology still has the following shortcomings: the lifting and translation mechanism on the feeding device lifts the door frame strip from the main conveyor line and clamps it through the clamping mechanism to complete the feeding. During this process, when the cylinder on the lifting and translation mechanism extends to lift the door frame strip, the extension and retraction distance of the cylinder is prone to error, which makes it impossible to ensure that each door frame is placed on the fixture in an absolutely consistent position. Furthermore, when feeding the door frame strip, the door frame strip cannot be stably centered, resulting in deviations in the lateral distance of multiple door frame strips and reducing the consistency of milling groove accuracy. Utility Model Content

[0003] The purpose of this application is to provide an automatic feeding device for a milling machine to solve the above-mentioned problems.

[0004] In a first aspect, the automatic feeding device for a milling machine provided in this application adopts the following technical solution: a support frame, a transmission mechanism, a lifting and translating mechanism, and a dust collection mechanism. The support frame consists of two parts, respectively supported below the beginning and end of the transmission mechanism. The transmission mechanism is used to transmit the door frame strips for milling. The lifting and translating mechanism is fixedly connected to the rear support frame via a stationary support plate, and is located below the transmission mechanism. A dust collection mechanism is installed at the front end of the lifting and translating mechanism to collect debris generated during processing. A cylinder is provided in the middle of the stationary support plate, with the top of the cylinder welded to the middle of the bottom of the displacement support plate. A magnetostrictive displacement sensor is provided at the left end of the stationary support plate, and a magnetic ring is provided at the left end of the displacement support plate. The magnetic ring is slidably fitted onto the stainless steel protective tube of the magnetostrictive displacement sensor. A clamping mechanism is provided on the displacement support plate to clamp and fix the door frame strips. By adopting the above technical solution, the non-contact high-precision displacement measurement of the magnetostrictive displacement sensor and magnetic ring is used to provide real-time feedback and control the extension and retraction stroke of the cylinder, ensuring that the lifting and translation mechanism can raise the door frame strip and position it to the same precise height every time, thus fundamentally eliminating the problem of inconsistent placement of the door frame strip caused by cylinder operation errors.

[0005] Preferably, the clamping mechanism includes a locking cylinder, a clamping head, a negative pressure chamber, and a suction cup. The locking cylinder is fixed to the upper end of the displacement support plate. The locking cylinder drives two oppositely arranged clamping heads to perform clamping actions. The locking cylinder has a negative pressure chamber in the middle, which is connected to the suction cup. The suction cup and the clamping head are both installed on the horizontal plate at the upper end of the locking cylinder. By adopting the above technical solution, the door frame strip is laterally pressed by two clamping heads to counteract the lateral force during milling, and the bottom of the door frame strip is negatively adsorbed by the suction cup, which will not leave indentations on the door frame surface. This forms a composite fixing method for the door frame strip, which not only clamps firmly but also effectively prevents movement during processing, improving the stability and safety of feeding.

[0006] Preferably, a guide telescopic rod is vertically provided between the stationary support plate and the displacement support plate. The guide telescopic rod is composed of a guide sleeve and a slidingly fitted guide rod. The bottom of the guide sleeve is located on the upper surface of the stationary support plate, and the top of the guide rod is located on the bottom surface of the displacement support plate. By adopting the above technical solution, the guide telescopic rod provides stable guidance and support for the lifting and lowering movement of the displacement support plate, effectively resisting the lateral force and torque caused by cylinder thrust bias or uneven load, preventing the displacement support plate from deflecting or jamming during the lifting and lowering process, and further ensuring the repeatability accuracy of the door frame strip lifting and positioning and the smooth operation of the lifting and translation mechanism.

[0007] Preferably, the dust collection mechanism includes a guide hood, a conveying pipe, a collection box, and a vacuum cleaner. The guide hood is located below the conveying mechanism, and the lower end of the guide hood is connected to the conveying pipe. The conveying pipe is interconnected with the collection box. A vacuum cleaner is installed on the outside of the collection box, and a filter bag is provided inside the collection box. By adopting the above technical solution, the vacuum cleaner generates negative pressure, which draws the debris generated during the milling process into the collection box through the guide hood and conveyor pipe, and collects it by the filter bag. This achieves real-time cleaning of debris in the processing area, keeps the equipment and working environment clean, and reduces the impact of dust on equipment precision and the health of operators.

[0008] Secondly, the automatic feeding device for a milling machine provided in this application adopts the following technical solution: the transmission mechanism includes a mounting frame, a conveyor belt, a drive shaft, and a motor. The mounting frame has a groove on its inner side, and the conveyor belt is installed inside the groove. The upper surface of the conveyor belt protrudes from the upper end of the mounting frame. The output end of the motor is welded to the right end of the drive shaft and rotates synchronously. The drive shaft is fixedly connected to a pulley inside the mounting frame. The rotation of the drive shaft drives the pulley to rotate synchronously, thereby driving the conveyor belt to run and transmit the door frame strip. By adopting the above technical solution, multiple mounting frames and conveyor belts are provided, and the multiple mounting frames are arranged side by side with intervals. Multiple conveyor belts can stably feed and transport the transverse door frame strips. The rear ends of the mounting frames and conveyor belts pass through the lower end of the milling machine, and the milling cutter on the milling machine is located above the mounting frames and conveyor belts, which facilitates the milling of grooves on the door frame strips transported by the conveyor belt.

[0009] Preferably, the transmission mechanism further includes a guiding mechanism, which includes an inclined guide plate, rollers, and a guide plate. The inclined guide plate is located at the front end of the guide plate and the two are integrated. Rollers are provided on both the inclined guide plate and the guide plate, and the rollers assist in the sliding guidance of the end of the door frame strip. By adopting the above technical solution, the integrated inclined guide plate and guide plate, together with the rollers on them, can smoothly guide the door frame strip into the transmission path and automatically correct the door frame strip to the centered transmission position. The roller structure greatly reduces frictional resistance, ensuring smooth transmission and accurate centering, and solving the problem of lateral distance deviation of the door frame strip.

[0010] Preferably, an adjusting rod is welded to the inner side of the rear end of the guide plate, and a fixing sleeve is welded to the outer surface of the mounting bracket. The inner end of the adjusting rod is slidably installed inside the fixing sleeve, and a spring-loaded pin is provided on the outer side of the fixing sleeve. The pin is used to elastically lock the position of the adjusting rod. By adopting the above technical solution, the lateral position of the guide mechanism can be flexibly and quickly adjusted according to different specifications of door frame strips through the adjustment of the adjusting rod, fixed sleeve and pin rod, and reliable locking is achieved by the pin rod, ensuring that workpieces of different sizes can obtain the best guiding effect, and enhancing the versatility and adaptability of the equipment.

[0011] In summary, this application includes at least one of the following beneficial technical effects of an automatic feeding device for milling machines: 1. A high-precision closed-loop feedback system composed of a magnetostrictive displacement sensor and a magnetic ring is used to monitor and control the lifting stroke of the cylinder in real time, effectively eliminating the cumulative stroke error caused by the cylinder's own error or internal leakage. Combined with the stable guidance provided by the guide telescopic rod, it ensures that each lifting action can accurately lift the door frame strip and position it to the same preset height, improving the consistency of processing accuracy. 2. The two clamping heads provide rigid clamping force from the side, effectively resisting the lateral cutting force generated during milling. At the same time, the suction cup applies negative pressure to the bottom of the workpiece, avoiding the indentation left on the surface of the door frame strip by a single rigid clamp. This composite clamping method ensures firm clamping and prevents processing movement while protecting the surface quality of the door frame strip. 3. The integrated inclined guide plate and guide plate, along with multiple rollers arranged on the inclined guide plate and guide plate, form an automatic correction channel during the feeding and conveying of the door frame strip. This can smoothly guide the door frame strip into the conveying path and automatically correct the door frame strip to the centered conveying position, solving the problem of inconsistent lateral distances among multiple door frame strips caused by deviation during the feeding and conveying process, and improving the consistency of processing accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a three-dimensional structural diagram of the lifting and translating mechanism of this application; Figure 3 This is a three-dimensional structural diagram of the clamping mechanism of this application; Figure 4 This is a three-dimensional structural diagram of the dust collection mechanism of this application; Figure 5 This is a three-dimensional structural diagram of the transmission mechanism of this application; Figure 6 This is a three-dimensional structural diagram of the guiding mechanism of this application; Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Transmission mechanism; 21. Mounting frame; 22. Conveyor belt; 23. Drive shaft; 24. Motor; 25. Guide mechanism; 251. Inclined guide plate; 252. Roller; 253. Guide plate; 254. Adjusting rod; 255. Fixed sleeve; 256. Pin rod; 3. Lifting and translating mechanism; 31. Stationary support plate; 32. Cylinder; 33. Magnetostrictive displacement sensor; 34. Magnetic ring; 35. Displacement support plate; 36. Clamping mechanism; 361. Locking cylinder; 362. Clamping head; 363. Negative pressure chamber; 364. Suction cup; 37. Guide telescopic rod; 4. Dust collection mechanism; 41. Flow guide hood; 42. Conveying pipe; 43. Collection box; 44. Vacuum cleaner. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0014] Example 1: An automatic feeding device for a milling machine, referring to... Figure 1-4The system includes a support frame 1, a transmission mechanism 2, a lifting and translating mechanism 3, and a dust collection mechanism 4. The system is characterized by: two support frames 1, each supported below the beginning and end of the transmission mechanism 2; the transmission mechanism 2 is used to transport the door frame strips for milling; the lifting and translating mechanism 3 is fixedly connected to the rear support frame 1 via a stationary support plate 31, and is located below the transmission mechanism 2; a dust collection mechanism 4 is installed at the front end of the lifting and translating mechanism 3 to collect debris generated during processing; a cylinder 32 is provided in the middle of the stationary support plate 31, with the top of the cylinder 32 welded to the bottom middle of a displacement support plate 35; a magnetostrictive displacement sensor 33 is provided at the left end of the stationary support plate 31; a magnetic ring 34 is provided at the left end of the displacement support plate 35, and the magnetic ring 34 is slidably fitted onto the stainless steel protective tube of the magnetostrictive displacement sensor 33; and a clamping mechanism 36 is provided on the displacement support plate 35 to clamp and fix the door frame strips. By adopting the above technical solution, the non-contact high-precision displacement measurement of the magnetostrictive displacement sensor 33 and the magnetic ring 34 is used to provide real-time feedback and control the extension and retraction stroke of the cylinder 32, ensuring that the lifting and translation mechanism 3 can lift the door frame strip and position it to the same precise height each time, thus avoiding the problem of inconsistent lifting position of the door frame strip caused by the operating error of the cylinder 32.

[0015] Preferably, the clamping mechanism 36 includes a locking cylinder 361, a clamping head 362, a negative pressure chamber 363, and a suction cup 364. The locking cylinder 361 is fixed to the upper end of the displacement support plate 35. The locking cylinder 361 drives two oppositely arranged clamping heads 362 to perform clamping actions. The locking cylinder 361 has a negative pressure chamber 363 in the middle, which is connected to the suction cup 364. The suction cup 364 and the clamping head 362 are both installed on the horizontal plate at the upper end of the locking cylinder 361. By adopting the above technical solution, the two clamping heads 362 are used to laterally press the door frame strip to offset the lateral force during milling, and the suction cup 364 is used to perform negative pressure adsorption on the bottom of the door frame strip, which will not leave indentations on the door frame surface. This forms a composite fixing method for the door frame strip, which not only clamps firmly but also effectively prevents movement during processing, improving the stability and safety of feeding.

[0016] Preferably, a guide telescopic rod 37 is vertically provided between the stationary support plate 31 and the displacement support plate 35. The guide telescopic rod 37 is composed of a guide sleeve and a guide rod that is slidably fitted. The bottom of the guide sleeve is provided on the upper surface of the stationary support plate 31, and the top of the guide rod is provided on the bottom surface of the displacement support plate 35. By adopting the above technical solution, the guide telescopic rod 37 provides stable guidance and support for the lifting and lowering movement of the displacement support plate 35, effectively resisting the lateral force and torque caused by the thrust bias of the cylinder 32 or uneven load, preventing the displacement support plate 35 from deflecting or jamming during the lifting and lowering process, and further ensuring the repeatability accuracy of the door frame strip lifting and positioning and the smooth operation of the lifting and translation mechanism 3.

[0017] Preferably, the dust collection mechanism 4 includes a guide hood 41, a conveying pipe 42, a collection box 43, and a vacuum cleaner 44. The guide hood 41 is located below the transmission mechanism 2, and the lower end of the guide hood 41 is connected to the conveying pipe 42. The conveying pipe 42 communicates with the collection box 43. The vacuum cleaner 44 is installed on the outside of the collection box 43, and a filter bag is provided inside the collection box 43. By adopting the above technical solution, the vacuum cleaner 44 generates negative pressure, which draws the debris generated during the milling process into the collection box 43 through the guide hood 41 and the conveying pipe 42, and collects it by the filter bag. This achieves the immediate cleaning of debris in the processing area, keeps the equipment and working environment clean, and reduces the impact of dust on the precision of the equipment and the health of the operators.

[0018] The implementation principle of this application embodiment is as follows: the door frame strip is transported by the front transmission mechanism 2 and smoothly transported to the top of the lifting and translating mechanism 3. The lifting and translating mechanism 3 starts to work, and its cylinder 32 extends under the command of the control system, pushing the displacement support plate 35 to move upward. In order to ensure the precise consistency of the lifting height, the magnetic ring 34 fixed on the displacement support plate 35 rises together with the displacement support plate 35. The displacement of the magnetic ring 34 relative to the magnetostrictive displacement sensor 33 fixed on the stationary support plate 31 is measured in real time and accurately and fed back to the control system. The control system dynamically adjusts the stroke of the cylinder 32 accordingly to ensure that the final position of multiple door frames is exactly the same each time they are lifted, eliminating the stroke error caused by internal leakage of the cylinder 32. Furthermore, during the lifting and lowering of the displacement support plate 35, the guide rod of the guide telescopic rod 37, which is vertically installed between the stationary support plate 31 and the displacement support plate 35, slides within the guide sleeve, providing stable guidance for the entire lifting process. This effectively resists the possible lateral forces and torques, preventing the displacement support plate 35 from deflecting or jamming during movement, and further ensuring positioning accuracy and operational stability. After the displacement support plate 35 drives the clamping mechanism 36 to lift the door frame strip to the set height, the locking cylinder 361 drives the two opposing clamping heads 362 to move towards each other, mechanically clamping the door frame strip from both sides to resist the main lateral force generated during milling. At the same time, the negative pressure chamber 363 in the middle of the locking cylinder 361 is connected to the negative pressure source, and the suction cup 364 that is connected to it generates a strong suction force on the bottom of the door frame strip, which not only ensures the firmness of the clamping, but also effectively prevents any movement during processing and avoids the possibility of leaving indentations on the surface of the door frame strip due to single rigid clamping. It is especially suitable for door frame strips with high surface quality requirements. The entire lifting and translating mechanism 3 lifts and clamps the door frame strip under the milling cutter of the milling machine for milling groove processing. During the milling groove processing, the vacuum cleaner 44 generates negative pressure, which draws the milling debris and dust from the processing area downwards, collects them through the guide hood 41, and transports them to the collection box 43 through the conveying pipe 42. The filter bag installed inside the collection box 43 filters and collects the debris, while clean air is discharged.

[0019] Example 2: An automatic feeding device for a milling machine, referring to... Figure 5-6 The transmission mechanism 2 includes a mounting frame 21, a conveyor belt 22, a drive shaft 23, and a motor 24. The mounting frame 21 has a groove on its inner side, and the conveyor belt 22 is installed inside the groove. The upper surface of the conveyor belt 22 protrudes from the upper end of the mounting frame 21. The output end of the motor 24 is welded to the right end of the drive shaft 23 and rotates synchronously. The drive shaft 23 is fixedly connected to a pulley inside the mounting frame 21. The rotation of the drive shaft 23 drives the pulley to rotate synchronously, thereby driving the conveyor belt 22 to run and transmit the door frame strips. By adopting the above technical solution, multiple mounting frames 21 and conveyor belts 22 are provided, and the multiple mounting frames 21 are arranged side by side with intervals. The multiple conveyor belts 22 can stably feed and transport the transverse door frame strips. The rear ends of the mounting frames 21 and the conveyor belts 22 pass through the lower end of the milling machine. The milling cutter on the milling machine is located above the mounting frames 21 and the conveyor belts 22, which facilitates the milling of the door frame strips transported by the conveyor belts 22.

[0020] Preferably, the transmission mechanism 2 further includes a guiding mechanism 25, which includes an inclined guide plate 251, a roller 252, and a guide plate 253. The inclined guide plate 251 is located at the front end of the guide plate 253 and the two are integrated. Rollers 252 are provided on both the inclined guide plate 251 and the guide plate 253. The rollers 252 assist in the sliding guidance of the end of the door frame strip. By adopting the above technical solution, the integrated inclined guide plate 251 and guide plate 253, together with the roller 252 thereon, can smoothly guide the door frame strip into the transmission path and automatically correct the door frame strip to the centered transmission position. The roller 252 structure greatly reduces frictional resistance, ensures smooth transmission and accurate centering, and solves the problem of lateral distance deviation of the door frame strip.

[0021] Preferably, an adjusting rod 254 is welded to the inner side of the rear end of the guide plate 253, and a fixing sleeve 255 is welded to the outer surface of the mounting bracket 21. The inner end of the adjusting rod 254 is slidably installed inside the fixing sleeve 255. A spring-loaded pin 256 is provided on the outer side of the fixing sleeve 255. The pin 256 is used to elastically lock the position of the adjusting rod 254. By adopting the above technical solution, the lateral position of the guide mechanism can be flexibly and quickly adjusted according to different specifications of door frame strips through the adjustment of the adjusting rod 254, the fixed sleeve 255 and the pin rod 256, and reliable locking is achieved through the pin rod 256, ensuring that workpieces of different sizes can obtain the best guiding effect, and enhancing the versatility and adaptability of the equipment.

[0022] The implementation principle of this application embodiment is as follows: After the motor 24 starts, it drives the transmission shaft 23 to rotate, and then drives the conveyor belt 22 to run through the pulley, so as to smoothly transport the door frame strip. During the transport process, the two ends of the door frame strip are guided by the inclined guide plates 251 and guide plates 253 on both sides. Multiple freely rotatable rollers 252 are installed on the surface of the inclined guide plates 251 and guide plates 253. When the end of the door frame strip contacts the inclined guide plate 251, the door frame strip is smoothly guided and gradually gathered into the channel formed by the guide plates 253 with the assistance of the rolling of the rollers 252, automatically correcting its center position, effectively solving the problem of lateral distance deviation caused by transmission deviation. Furthermore, to accommodate door frame strips of different widths, when the width of the guide channel needs to be adjusted, the operator pulls the pin 256 outward to compress the spring inside, causing the pin 256 to exit from the positioning hole of the adjusting rod 254. Then, the tilting guide plate 251 and the guide plate 253 can be slid laterally to the appropriate position. After releasing the pin 256, under the action of the spring, the pin 256 will automatically spring back and insert into the corresponding new positioning hole on the adjusting rod 254, achieving quick and reliable locking of the position.

[0023] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic feeding device for a milling machine, comprising a support frame (1), a transmission mechanism (2), a lifting and translation mechanism (3), and a dust collection mechanism (4), characterized in that: Two support frames (1) are provided, which are respectively supported below the beginning and end of the transmission mechanism (2). The transmission mechanism (2) is used to transmit the door frame strip for milling. The lifting and translating mechanism (3) is fixedly connected to the support frame (1) behind through the stationary support plate (31). The lifting and translating mechanism (3) is located below the transmission mechanism (2). The front end of the lifting and translating mechanism (3) is equipped with a dust collection mechanism (4) for collecting the debris generated during the processing. The middle part of the stationary support plate (31) is equipped with a cylinder (32). The top of the cylinder (32) is welded to the middle of the bottom of the displacement support plate (35). The left end of the stationary support plate (31) is equipped with a magnetostrictive displacement sensor (33). The left end of the displacement support plate (35) is equipped with a magnetic ring (34). The magnetic ring (34) is slidably fitted on the stainless steel protective tube of the magnetostrictive displacement sensor (33). The displacement support plate (35) is equipped with a clamping mechanism (36) for clamping and fixing the door frame strip.

2. The automatic feeding device for a milling machine according to claim 1, characterized in that, The clamping mechanism (36) includes a locking cylinder (361), a clamping head (362), a negative pressure chamber (363), and a suction cup (364). The locking cylinder (361) is fixed to the upper end of the displacement support plate (35). The locking cylinder (361) drives two opposing clamping heads (362) to perform clamping actions. The locking cylinder (361) has a negative pressure chamber (363) in the middle. The negative pressure chamber (363) is connected to the suction cup (364). The suction cup (364) and the clamping head (362) are both installed on the horizontal plate at the upper end of the locking cylinder (361).

3. The automatic feeding device for a milling machine according to claim 1, characterized in that, A guide telescopic rod (37) is vertically provided between the stationary support plate (31) and the displacement support plate (35). The guide telescopic rod (37) is composed of a guide sleeve and a slidingly fitted guide rod. The bottom of the guide sleeve is set on the upper surface of the stationary support plate (31), and the top of the guide rod is set on the bottom surface of the displacement support plate (35).

4. The automatic feeding device for a milling machine according to claim 1, characterized in that, The dust collection mechanism (4) includes a guide hood (41), a conveying pipe (42), a collection box (43), and a vacuum cleaner (44). The guide hood (41) is located below the transmission mechanism (2), and the lower end of the guide hood (41) is connected to the conveying pipe (42). The conveying pipe (42) is interconnected with the collection box (43). The vacuum cleaner (44) is installed on the outside of the collection box (43), and a filter bag is provided inside the collection box (43).

5. An automatic feeding device for a milling machine according to claim 3, characterized in that, The transmission mechanism (2) includes a mounting frame (21), a conveyor belt (22), a drive shaft (23), and a motor (24). The mounting frame (21) has a groove on its inner side, and the conveyor belt (22) is installed inside the groove. The upper surface of the conveyor belt (22) protrudes from the upper end of the mounting frame (21). The output end of the motor (24) is welded to the right end of the drive shaft (23) and rotates synchronously. The drive shaft (23) is fixedly connected to the pulley inside the mounting frame (21). The rotation of the drive shaft (23) drives the pulley to rotate synchronously, thereby driving the conveyor belt (22) to run and transmit the door frame strip.

6. An automatic feeding device for a milling machine according to claim 5, characterized in that, The transmission mechanism (2) further includes a guide mechanism (25), which includes an inclined guide plate (251), a roller (252), and a guide plate (253). The inclined guide plate (251) is located at the front end of the guide plate (253) and the two are integrated structures. Rollers (252) are provided on both the inclined guide plate (251) and the guide plate (253). The rollers (252) assist the sliding guide of the end of the door frame strip.

7. An automatic feeding device for a milling machine according to claim 6, characterized in that, An adjusting rod (254) is welded to the inner side of the rear end of the guide plate (253), and a fixing sleeve (255) is welded to the outer surface of the mounting bracket (21). The inner end of the adjusting rod (254) is slidably installed inside the fixing sleeve (255). A spring-loaded pin (256) is provided on the outer side of the fixing sleeve (255). The pin (256) is used to elastically lock the position of the adjusting rod (254).

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