L-shaped machine tool guard door

Abstract

The utility model provides a kind of L-shaped machine tool protective door, including machine tool bottom pedestal and door body component, the door body component is set above machine tool bottom pedestal;Bottom guide component, the bottom guide component is installed in door body component bottom;Upper transmission component, the upper transmission component includes installation base plate, the installation base plate is fixed in door body component upper portion by bolt, the installation base plate side is connected with driving source, and the output end of the driving source is connected with driving gear;Rotary drive component, the rotary drive component includes cylinder, the cylinder is installed in door body component upper portion, the execution end of the cylinder is connected with rack pusher, and the rack pusher is cooperated with rotary door portion transmission.This utility model combines the traditional two independent door body into a fan L-shaped door, reduces a set of driving mechanism, guide rail and control system, the number of parts is reduced, and production cost and assembly labor cost are significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of machining beds, and in particular to an L-shaped machine tool protective door. Background Technology

[0002] CNC machine tools are automated machining equipment that integrates machining, computer control, and servo drive. Unlike ordinary manual machine tools, they rely on preset CNC programs to precisely control the movements of the cutting tools, spindle, and worktable. They can stably complete various cutting processes such as turning, milling, drilling, and grinding, with high machining accuracy and controllable errors. They can batch process complex curved surfaces and irregularly shaped parts, significantly reducing dimensional deviations caused by manual operation and widely replacing traditional machine tools to improve machining consistency. CNC equipment is suitable for all fields of precision manufacturing, and is widely used in aerospace, automotive parts, mold making, hardware, and medical device industries. Operators only need to write and debug machining programs according to drawings, and the machine tool can operate automatically and continuously. It can achieve both single-piece customized machining and large-scale assembly line production, effectively shortening the production cycle and reducing labor costs. It is an indispensable core basic equipment for modern high-end equipment manufacturing.

[0003] Safety doors for CNC machine tools are a crucial component of machine tool safety. They must prevent debris and coolant from splashing out during machining, ensure operator safety, and facilitate workpiece loading and unloading. However, traditional safety doors are often two independent sliding doors, requiring significant lateral sliding space when opening. For large equipment, the large size and weight of the doors result in long guide rails, high difficulty in straightness machining, and high material and processing costs. Traditional double doors require two separate drive mechanisms, which not only increases the number of parts and assembly / adjustment time but also makes it difficult to guarantee the synchronization of the two doors' opening and closing, affecting the reliability of automated control. Utility Model Content

[0004] In order to overcome the shortcomings of existing technologies, such as long assembly and adjustment time, high cost, and poor synchronization, this utility model provides an L-shaped machine tool protective door.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: This utility model provides an L-shaped machine tool protective door, including a machine tool bottom base and a door assembly. The door assembly is disposed above the machine tool bottom base and includes a fixed door part and a rotating door part, which are rotatably connected. A bottom guide assembly is installed at the bottom of the door assembly. The bottom guide assembly includes a mountain-shaped guide rail and a V-shaped bearing. The mountain-shaped guide rail is fixed to the bottom base of the machine tool by bolts. The V-shaped groove of the V-shaped bearing and the top flange of the mountain-shaped guide rail form a rolling fit. The upper transmission assembly includes a mounting base plate, which is fixed to the upper part of the door assembly by bolts. A drive source is connected to one side of the mounting base plate, and a drive gear is connected to the output end of the drive source. The drive gear meshes with a transmission rack on its side, and the transmission rack is connected to the upper crossbeam of the machine tool. A rotary drive assembly, comprising a cylinder mounted on the upper part of the door assembly, wherein the actuating end of the cylinder is connected to a rack and pinion pusher, and the rack and pinion pusher is in transmission cooperation with the rotating door. A floating caster assembly is provided at the bottom of the door assembly. The floating caster assembly includes casters, which are disposed within a guide rail. The guide rail is connected to the top of the machine tool base.

[0006] In this technical solution, the mechanical interlocking structure formed by the V-shaped bearing and the limit bearing effectively prevents the bearing from derailing and keeps the door's jumping within a controllable range.

[0007] The L-shaped door can retract to the inner side of the outer protection when the door is opened, without occupying the external space of the machine tool, which facilitates workpiece clamping and transportation.

[0008] Preferably, the rotating door has two working positions. In the first position, it is aligned with the fixed door in a straight line, forming a straight line, and the door can be retracted as a whole into the inner side of the machine tool's outer protection. In the second position, it rotates 90° relative to the fixed door, forming an "L" shape, which is used to close the corner of the machine tool.

[0009] Preferably, the fixed door portion and the rotating door portion are rotatably connected by a rotating shaft; The rack and pinion pusher includes a driven gear, and the rotating door is fixed with the driven gear; The actuator end of the cylinder is connected to a drive rack, which meshes with a driven gear.

[0010] In this technical solution, the rotational movement of the revolving door is achieved through a rotation drive component.

[0011] Preferably, the stroke of the cylinder matches the displacement of the drive rack required for the driven gear to rotate 90°, and the extended end and retracted end of the cylinder correspond to the second position and the first position of the rotating door, respectively.

[0012] Preferably, the bottom guide assembly further includes a limiting bearing and a connecting support. The limiting bearing is fixed to the bottom of the door assembly via the connecting support and is located on the side of the V-shaped bearing. The outer ring of the limiting bearing is in close contact with the side of the mountain-shaped guide rail. The distance between the limiting bearing and the V-shaped bearing is less than the width of the mountain-shaped guide rail.

[0013] In this technical solution, a limiting bearing is used to ensure that the V-shaped bearing always stays on the mountain-shaped guide rail and does not come off.

[0014] Preferably, the upper transmission assembly further includes a linear guide rail assembly and sliding blocks. A plurality of sliding blocks are connected to one side of the mounting base plate. The sliding blocks are slidably connected to the linear guide rail assembly, and the linear guide rail assembly is bolted to the upper part of the machine tool.

[0015] In this technical solution, the meshing of the gear and rack is provided with precise guidance and constraint through the linear guide rail assembly and the sliding block.

[0016] Preferably, the sliding block is provided with a purging component and a lubrication component. The purging component is located on both sides of the sliding block and performs purging and scraping treatment on the linear guide rail assembly. The lubrication component is located between the linear guide rail assembly and the sliding block, and is used to lubricate the linear guide rail assembly.

[0017] In this technical solution, the sliding block slides more smoothly through the purging component and the lubrication component.

[0018] Preferably, the inner wall of the sliding block is connected to a partition plate, which divides the inner cavity of the sliding block into two air chambers and an oil chamber. The two air chambers are connected to the purging assembly, and the oil chamber is connected to the lubrication assembly. The partition plate is connected to multiple connecting pipes on one side, and the two air chambers are connected through the multiple connecting pipes.

[0019] In this technical solution, lubricating oil is stored in an oil cavity.

[0020] Preferably, the purging assembly includes an air pipe, one end of which is connected to a sliding block, and multiple purging holes are provided on both sides of the linear guide rail assembly, with the purging holes inclined toward the sliding block. The sliding block is provided with soft scrapers and hard scrapers on both the left and right sides. The soft scrapers and hard scrapers are connected to each other. Multiple fixed posts are connected to the side of the soft scraper away from the hard scraper. One end of the fixed post is connected to the side of the sliding block.

[0021] In this technical solution, the surface of the linear guide rail assembly is cleaned by a purging component.

[0022] Preferably, the lubrication assembly includes an oil pipe, one end of which is connected to a sliding block; A micro pump is connected to the bottom of the sliding block. The output end of the micro pump is connected to an upper connecting pipe and a lower connecting pipe. The ends of the upper connecting pipe and the lower connecting pipe away from the micro pump are connected to an oiled cotton block. The oiled cotton block is connected to one side of the sliding block, and the other side of the oiled cotton block is in contact with the surface of the linear guide rail assembly.

[0023] In this technical solution, the linear guide rail assembly is lubricated by a lubrication component, making the sliding block slide more smoothly.

[0024] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0025] The positive and progressive effects of this utility model are as follows: This utility model combines two traditional independent door panels into one L-shaped door, reducing the number of drive mechanisms, guide rails, and control systems. This reduces the number of parts and significantly lowers production and assembly labor costs.

[0026] The mechanical interlocking structure formed by the V-shaped bearing and the limit bearing effectively prevents the bearing from derailing and keeps the door's movement within a controllable range; the linear guide provides precise guidance for the gear and rack meshing, ensuring smooth transmission and avoiding impact and noise.

[0027] The L-shaped door can retract to the inner side of the outer protection when the door is opened, without occupying the external space of the machine tool, which facilitates workpiece clamping and transportation, and improves the operability and space utilization of the machine tool. The fixed door and the rotating door are connected by rotation to achieve switching between the "I" shape and the "L" shape working positions, which can flexibly adapt to the protection needs of the straight sections and corners of the machine tool.

[0028] The guide rail is set as an arc segment in the area corresponding to the revolving door body. The casters roll along the arc groove, which provides auxiliary support and rotation radius constraint when the revolving door rotates relative to the fixed door body. This ensures smooth and reliable rotation, avoids off-center loading and shaking caused by the cantilever structure, and extends the service life of the guide rail and rolling parts.

[0029] By integrating the three functions of blowing, scraping, and lubrication into a single sliding component through a blowing and lubrication assembly, air is ejected at high speed from the blowing hole to form an air knife, instantly blowing away chips and dust from the guide rail surface; a soft scraper removes floating dust, while a hard scraper removes adhering sludge; and oiled cotton blocks periodically supply oil to lubricate the guide rail surface. This design ensures that the working surface of the linear guide rail assembly remains clean and lubricated for a long time, reducing maintenance frequency and improving the door's response speed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the L-shaped machine tool protective door according to an embodiment of the present utility model.

[0031] Figure 2 for Figure 1 The diagram shows the overall three-dimensional structure of the L-shaped machine tool protective door. Figure 1 .

[0032] Figure 3 for Figure 1The diagram shows the overall three-dimensional structure of the L-shaped machine tool protective door. Figure 2 .

[0033] Figure 4 for Figure 1 The diagram shows the overall side view of the L-shaped machine tool protective door.

[0034] Figure 5 for Figure 4 The diagram shows a partially enlarged view of section A of the L-shaped machine tool protective door.

[0035] Figure 6 for Figure 1 The diagram shows the overall top view of the L-shaped machine tool protective door.

[0036] Figure 7 for Figure 6 The diagram shows a partially enlarged structural schematic of point B of the L-shaped machine tool protective door.

[0037] Figure 8 for Figure 1 The diagram shows a top view of the overall structure of the L-shaped machine tool protective door.

[0038] Figure 9 for Figure 8 The diagram shows a partially enlarged view of section C of the L-shaped machine tool protective door.

[0039] Figure 10 for Figure 1 The diagram shows a three-dimensional structure of the upper transmission assembly of the L-shaped machine tool protective door.

[0040] Figure 11 for Figure 1 The diagram shows a three-dimensional structure of the linear guide rail assembly, sliding block, purging assembly, and lubrication assembly of the L-shaped machine tool protective door.

[0041] Figure 12 for Figure 11 The diagram shows a cross-sectional view of the linear guide rail assembly, sliding block, purging assembly, and lubrication assembly of the L-shaped machine tool protective door.

[0042] Figure 13 for Figure 11 The diagram shows a three-dimensional structure of the sliding block, purging assembly, and lubrication assembly of the L-shaped machine tool protective door.

[0043] Figure 14 for Figure 13 The diagram shows a cross-sectional view of the sliding block, purging assembly, and lubrication assembly of the L-shaped machine tool protective door.

[0044] Explanation of reference numerals in the attached figures 1. Machine tool base; 2. Door assembly; 21. Fixed door section; 22. Revolving door section; 3. Bottom guide assembly; 31. Mountain-shaped guide rail; 32. V-shaped bearing; 33. Limit bearing; 34. Connecting support; 4. Upper transmission assembly; 41. Mounting base plate; 42. Drive source; 43. Drive gear; 44. Transmission rack; 45. Linear guide rail assembly; 46. Sliding block; 5. Rotary drive assembly; 51. Cylinder; 52. Rotary shaft; 53. Drive rack; 54. Driven gear; 6. Floating caster assembly; 61. Casters; 62. Guide rail; 7. Purge assembly; 71. Air tube; 72. Purge port; 73. Soft scraper; 74. Hard scraper; 75. Fixing post; 8. Lubrication components; 81. Oil pipes; 82. Micro pump; 83. Upper connecting pipe; 84. Lower connecting pipe; 85. Oiled cotton pads; 9. Divider; 10. Connecting pipe. Detailed Implementation

[0045] The present invention will be further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments described herein.

[0046] Figures 1 to 14 The diagram shown is a structural schematic of an embodiment of the L-shaped machine tool protective door of this utility model.

[0047] An L-shaped machine tool protective door includes a machine tool bottom base 1 and a door assembly 2. The door assembly 2 is disposed above the machine tool bottom base 1. The door assembly 2 includes a fixed door portion 21 and a rotating door portion 22, which are rotatably connected. Bottom guide assembly 3 is installed at the bottom of door assembly 2. Bottom guide assembly 3 includes a mountain-shaped guide rail 31 and a V-shaped bearing 32. The mountain-shaped guide rail 31 is fixed to the machine tool base 1 by bolts. The V-shaped groove of the V-shaped bearing 32 forms a rolling fit with the top flange of the mountain-shaped guide rail 31 to bear the main weight of the door assembly 2. The upper transmission assembly 4 includes a mounting base plate 41, which is fixed to the upper part of the door assembly 2 by bolts. A drive source 42 is connected to one side of the mounting base plate 41, and a drive gear 43 is connected to the output end of the drive source 42. The side of the drive gear 43 meshes with a transmission rack 44, and the transmission rack 44 is connected to the upper crossbeam of the machine tool. Rotary drive assembly 5 includes cylinder 51, which is mounted on the upper part of door assembly 2. The actuating end of cylinder 51 is connected to rack and pinion pusher, and rack and pinion pusher is in transmission cooperation with rotating door part 22. The floating caster assembly 6 is located at the bottom of the door assembly 2. The floating caster assembly 6 includes casters 61, which are located inside guide rails 62. The guide rails 62 are connected to the top of the machine tool base 1.

[0048] The caster 61 is connected to the bottom via an elastic floating component, which includes a guide sleeve, a guide rod, and a compression spring. The guide sleeve is fixed to the bottom of the door assembly 2, the guide rod is slidably disposed within the guide sleeve, and the caster 61 is installed at the lower end of the guide rod. A compression spring is sleeved on the guide rod, with its two ends abutting against the guide sleeve and the mounting base of the caster 61, respectively.

[0049] The caster 61 is installed in the guide rail 62 of the machine tool base 1. The guide rail 62 constrains the movement direction of the caster 61. When the door moves horizontally, the caster 61 rolls in the guide rail 62 to share the weight of the door. When the ground is uneven or there is a height difference in the guide rail 62, the compression spring undergoes elastic deformation, and the caster 61 floats up and down in the guide sleeve along with the guide rod, automatically compensating for the height difference and preventing the door from getting stuck due to local protrusion.

[0050] When the revolving door rotates, the guide rail 62 is set as an arc segment in the rotation area, and the caster 61 rolls along the arc groove, providing auxiliary support and rotation radius constraint during rotation.

[0051] The elastic deformation of the compression spring automatically compensates for changes in ground height, eliminating the need for precise ground leveling, significantly reducing installation and debugging time, and effectively preventing the door from jamming due to uneven ground.

[0052] The mechanical interlocking structure formed by the V-shaped bearing 32 and the limit bearing 33 effectively prevents the bearing from derailing and keeps the door's movement within a controllable range.

[0053] The L-shaped door can retract to the inner side of the outer protection when the door is opened, without occupying the external space of the machine tool, which facilitates workpiece clamping and transportation.

[0054] The rotating door 22 has two working positions. In the first position, it is aligned with the fixed door 21 in a straight line, forming a straight line, and the door can be retracted as a whole into the inner side of the machine tool's outer protection. In the second position, it rotates 90° relative to the fixed door 21, forming an "L" shape, which is used to close the corner of the machine tool.

[0055] The fixed door section 21 and the rotating door section 22 are rotatably connected by a rotating shaft 52; The rack and pinion pusher includes a driven gear 54, and the driven gear 54 is fixed on the rotating door portion 22; The actuator end of cylinder 51 is connected to drive rack 53, and drive rack 53 is meshed with driven gear 54.

[0056] The rotational movement of the rotating door part 22 is achieved through the rotation drive component 5.

[0057] When closing the door, after the rotating door part 22 is translated forward along the bottom guide rail to the limit position, the piston rod of the air cylinder 51 extends, pushing the driving rack 53 to move linearly forward, and the driving rack 53 drives the driven gear 54 to rotate; When the air cylinder 51 extends to the end of its stroke, the driven gear 54 just rotates 90°, and the rotating door part 22 reaches the second position. At this time, it is in an L-shaped state, completing the enclosure of the machine tool corner.

[0058] When opening the door, the piston rod of the air cylinder 51 retracts, the driving rack 53 moves linearly backward, the driven gear 54 rotates reversely by 90°, and the rotating door part 22 returns to the first position. At this time, it is in a straight state, and the door body is in a "one" shape. Subsequently, the whole door body slides and retracts inside the outer protection of the machine tool.

[0059] To ensure the accuracy of the 90° rotation angle, limit blocks and buffers are respectively arranged at the extending end and the retracting end of the air cylinder 51.

[0060] The stroke of the air cylinder 51 matches the displacement of the driving rack 53 required for the driven gear 54 to rotate 90°. The extending end and the retracting end of the air cylinder 51 respectively correspond to the second position and the first position of the rotating door part 22.

[0061] The bottom guiding component 3 further includes a limit bearing 33 and a connecting support 34. The limit bearing 33 is fixed to the bottom of the door body component 2 through the connecting support 34, is arranged on the side of the V-shaped bearing 32, and the outer ring of the limit bearing 33 closely adheres to the side surface of the mountain-shaped guide rail 31; The distance between the limit bearing 33 and the V-shaped bearing 32 is less than the width of the mountain-shaped guide rail 31, so that when the door body is subjected to a lateral force, the limit bearing 33 contacts the side surface of the guide rail prior to the V-shaped bearing 32, forming a mechanical constraint to prevent the V-shaped bearing 32 from disengaging from the guide rail.

[0062] By means of the limit bearing 33, it is ensured that the V-shaped bearing 32 always rides on the mountain-shaped guide rail 31 without disengaging, and at the same time, the running jump of the door body component 2 is controlled within the design tolerance range.

[0063] The cross-section of the mountain-shaped guide rail 31 is in a "mountain" - shaped structure, and the cross-section of the V-shaped bearing 32 is in a V-shaped structure; Two groups of V-shaped bearings 32 are arranged at the mountain-shaped guide rail 31. The two groups of V-shaped bearings 32 are arranged at intervals along the movement direction of the door body. The interval is calculated and determined according to the weight and the center of gravity position of the door body to ensure the smooth operation of the door body.

[0064] The upper transmission assembly 4 also includes a linear guide rail assembly 45 and a sliding block 46. Multiple sliding blocks 46 are connected to one side of the mounting base plate 41. The sliding blocks 46 are slidably connected to the linear guide rail assembly 45. The linear guide rail assembly 45 is connected to the upper part of the machine tool by bolts.

[0065] The linear guide rail assembly 45 and the sliding block 46 provide precise guiding constraints for the meshing of the gear and rack, ensuring the center distance and perpendicularity of the gear and rack, and avoiding the impact and noise caused by poor meshing.

[0066] When in use, the drive source 42 drives the drive gear 43 to rotate, so that the drive gear 43 rolls smoothly on the transmission rack 44, thereby driving the door assembly 2 to move horizontally.

[0067] A purging component 7 and a lubrication component 8 are provided at the sliding block 46. The purging component 7 is located on both sides of the sliding block 46. The purging component 7 performs purging and scraping treatment on the linear guide rail assembly 45. The lubrication component 8 is located between the linear guide rail assembly 45 and the sliding block 46, and is used to lubricate the linear guide rail assembly 45.

[0068] The purging component 7 and the lubrication component 8 make the sliding block 46 slide more smoothly.

[0069] The inner wall of the sliding block 46 is connected to a partition plate 9, which divides the inner cavity of the sliding block 46 into two air chambers and an oil chamber. The two air chambers are connected to the purging assembly 7, and the oil chamber is connected to the lubrication assembly 8. Multiple connecting pipes 10 are connected to one side of the partition plate 9, and the two air chambers are connected through the multiple connecting pipes 10.

[0070] Lubricating oil is stored in the oil chamber.

[0071] The purging assembly 7 includes an air pipe 71, one end of which is connected to the sliding block 46 and the other end of which is connected to an air source. Multiple purging holes 72 are provided on both sides of the linear guide rail assembly 45, and the purging holes 72 are inclined toward the sliding block 46. The sliding block 46 is provided with a soft scraper 73 and a hard scraper 74 on both the left and right sides. The soft scraper 73 and the hard scraper 74 are connected to each other. Multiple fixing posts 75 are connected to the side of the soft scraper 73 away from the hard scraper 74. One end of the fixing post 75 is connected to the side of the sliding block 46.

[0072] The surface of the linear guide assembly 45 is cleaned by the purging component 7.

[0073] A solenoid valve is installed on the trachea 71.

[0074] The air source can be the air source for the machine tool or an independent air source; When used as the air source for the machine tool, it is connected to the PLC control system. When the PLC control system receives the "open door" or "close door" command, the solenoid valve is activated before the drive source 42, and high-pressure gas is ejected at high speed from the blow hole 72, forming a cleaning air knife on the guide rail surface. This air knife can instantly blow away chips and dust that fall on the guide rail from the working surface of the guide rail, ensuring that the surface of the guide rail is free of hard particles.

[0075] When there is an independent air source, the PLC control system still passes gas into the sliding block 46 before the drive source 42 is turned on, so that the gas is ejected at high speed from the purge hole 72 and forms a cleaning air knife on the guide rail surface.

[0076] The hard scraper 74 is made of a harder material and is used to scrape off firmly adhered sludge; the soft scraper 73 is made of a softer material and is used to scrape off residual dust from the linear guide assembly 45.

[0077] When the sliding block 46 moves, it drives the fixed column 75 to move in the same direction, thereby driving the soft scraper 73 and the hard scraper 74 to move in the same direction, and using the soft scraper 73 and the hard scraper 74 to remove the material on the surface of the linear guide rail assembly 45.

[0078] Lubrication assembly 8 includes an oil pipe 81, one end of which is connected to the sliding block 46, and the other end of which is connected to the oil delivery system; The bottom of the sliding block 46 is connected to a micro pump 82. The output end of the micro pump 82 is connected to an upper connecting pipe 83 and a lower connecting pipe 84. The ends of the upper connecting pipe 83 and the lower connecting pipe 84 away from the micro pump 82 are connected to an oiled cotton block 85. The oiled cotton block 85 is connected to one side of the sliding block 46, and the other side of the oiled cotton block 85 is in contact with the surface of the linear guide rail assembly 45.

[0079] The linear guide rail assembly 45 is lubricated by the lubrication component 8, which makes the sliding block 46 slide more smoothly.

[0080] The oil delivery system includes an oil reservoir and an oil pump, which are used to deliver lubricating oil into the oil chamber of the sliding block 46.

[0081] The inlet end of the micro pump 82 is connected to the oil chamber of the sliding block 46.

[0082] During use, or as required by time or other conditions, the micro pump 82 delivers the lubricating oil in the sliding block 46 into the upper connecting pipe 83 and the lower connecting pipe 84, and finally into the oiled cotton block 85, which is used to lubricate the linear guide rail assembly 45.

[0083] In addition, to prevent oil leakage, an oil collection groove and a return hole are provided at the bottom of the linear guide assembly 45. Excess oil will flow back to the oil storage box and will not contaminate the machine tool base 1.

[0084] The linear guide assembly 45 is preferably an SBR linear guide assembly.

[0085] The drive source 42 is a motor or other device that can output rotational kinetic energy; The motor is used in conjunction with a speed reducer.

[0086] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An L-shaped machine tool protective door, characterized in that: It includes a machine tool bottom base (1) and a door assembly (2), the door assembly (2) being disposed above the machine tool bottom base (1), the door assembly (2) including a fixed door part (21) and a rotating door part (22), the fixed door part (21) and the rotating door part (22) being rotatably connected; Bottom guide assembly (3), the bottom guide assembly (3) is installed at the bottom of the door assembly (2), the bottom guide assembly (3) includes a mountain-shaped guide rail (31) and a V-shaped bearing (32), the mountain-shaped guide rail (31) is fixed to the machine tool bottom base (1) by bolts, and the V-shaped groove of the V-shaped bearing (32) forms a rolling fit with the top flange of the mountain-shaped guide rail (31); The upper transmission assembly (4) includes a mounting base plate (41), which is fixed to the upper part of the door assembly (2) by bolts. A drive source (42) is connected to one side of the mounting base plate (41), and a drive gear (43) is connected to the output end of the drive source (42). The drive gear (43) is meshed with a transmission rack (44) on its side, and the transmission rack (44) is connected to the upper crossbeam of the machine tool. A rotary drive assembly (5) includes a cylinder (51) mounted on the upper part of the door assembly (2). The actuating end of the cylinder (51) is connected to a rack pusher, and the rack pusher is in transmission cooperation with the rotating door part (22). A floating caster assembly (6) is provided at the bottom of the door assembly (2). The floating caster assembly (6) includes a caster (61) which is provided in a guide rail (62). The guide rail (62) is connected to the top of the machine tool bottom base (1). The upper transmission assembly (4) also includes a linear guide rail assembly (45) and a sliding block (46). A plurality of sliding blocks (46) are connected to one side of the mounting base plate (41). The sliding blocks (46) are slidably connected to the linear guide rail assembly (45). The linear guide rail assembly (45) is bolted to the upper part of the machine tool. A purging assembly (7) and a lubrication assembly (8) are provided at the sliding block (46). The purging assembly (7) is located on both sides of the sliding block (46). The purging assembly (7) performs purging and scraping treatment on the linear guide rail assembly (45). The lubrication component (8) is located between the linear guide rail assembly (45) and the sliding block (46), and the lubrication component (8) is used to lubricate the linear guide rail assembly (45). The purging assembly (7) includes a purging hole (72) and a soft scraper (73). Multiple purging holes (72) are provided on both sides of the linear guide rail assembly (45). The purging holes (72) are inclined toward the sliding block (46). The soft scraper (73) and the hard scraper (74) are provided on both sides of the sliding block (46). The lubrication assembly (8) includes an oiled cotton block (85), which is connected to one side of the sliding block (46), and the other side of the oiled cotton block (85) is in contact with the surface of the linear guide assembly (45).

2. The L-shaped machine tool protective door as described in claim 1, characterized in that: The rotating door (22) has two working positions. In the first position, it is on the same straight line as the fixed door (21) and is in the shape of "I". The door can be retracted as a whole to the inner side of the machine tool's outer protection. In the second position, it rotates 90° relative to the fixed door (21) and is in the shape of "L", which is used to close the corner of the machine tool.

3. The L-shaped machine tool protective door as described in claim 1, characterized in that: The fixed door section (21) and the rotating door section (22) are rotatably connected by a rotating shaft (52); The rack pusher includes a driven gear (54), and the driven gear (54) is fixed on the rotating door (22). The actuator end of the cylinder (51) is connected to the drive rack (53), and the drive rack (53) is meshed with the driven gear (54).

4. The L-shaped machine tool protective door as described in claim 1, characterized in that: The stroke of the cylinder (51) matches the displacement of the drive rack (53) required for the driven gear (54) to rotate 90°. The extended end and the retracted end of the cylinder (51) correspond to the second position and the first position of the rotating door (22), respectively.

5. The L-shaped machine tool protective door as described in claim 1, characterized in that: The bottom guide assembly (3) also includes a limiting bearing (33) and a connecting support (34). The limiting bearing (33) is fixed to the bottom of the door assembly (2) through the connecting support (34) and is located on the side of the V-shaped bearing (32). The outer ring of the limiting bearing (33) is close to the side of the mountain-shaped guide rail (31). The distance between the limiting bearing (33) and the V-shaped bearing (32) is less than the width of the mountain-shaped guide rail (31).

6. The L-shaped machine tool protective door as described in claim 1, characterized in that: The inner wall of the sliding block (46) is connected to a partition plate (9), which divides the inner cavity of the sliding block (46) into two air chambers and an oil chamber. The two air chambers are connected to the purging assembly (7), and the oil chamber is connected to the lubrication assembly (8). The partition plate (9) is connected to a plurality of connecting pipes (10) on one side, and the two air chambers are connected through the plurality of connecting pipes (10).

7. The L-shaped machine tool protective door as described in claim 1, characterized in that: The purging assembly (7) also includes an air tube (71), one end of which is connected to a sliding block (46); The sliding block (46) is provided with a soft scraper (73) and a hard scraper (74) on both the left and right sides. The soft scraper (73) and the hard scraper (74) are connected to each other. A plurality of fixed posts (75) are connected to the side of the soft scraper (73) away from the hard scraper (74). One end of the fixed post (75) is connected to the side of the sliding block (46).

8. The L-shaped machine tool protective door as described in claim 1, characterized in that: The lubrication assembly (8) includes an oil pipe (81), one end of which is connected to a sliding block (46); The bottom of the sliding block (46) is connected to a micro pump (82), and the output end of the micro pump (82) is connected to an upper connecting pipe (83) and a lower connecting pipe (84). The ends of the upper connecting pipe (83) and the lower connecting pipe (84) away from the micro pump (82) are connected to an oiled cotton block (85).

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