Guard device for gantry machining center

Abstract

The utility model discloses a protective device for gantry machining center, including two cross beams and two vertical beams, two cross beams and two vertical beams head and tail connection constitute a rectangular frame, one moving door frame is connected with the common sliding of two cross beams, and the left and right sides of moving door frame are connected with vertical shielding curtain respectively, and the one end of vertical shielding curtain away from moving door frame is connected with vertical beam, and vertical shielding curtain is articulated with several vertical protection pieces and constitutes, the observation window is connected with the vertical sliding in moving door frame, and the observation window is equipped with observation hole, and the inlaying of observation hole has the protection board, and the protection board is transparent material, and the upper and lower ends of observation window are connected with horizontal shielding curtain respectively, and the one end of horizontal shielding curtain away from observation window is connected with moving door frame, and horizontal shielding curtain is articulated with several horizontal protection pieces and constitutes. Through the sliding connection of moving door frame and cross beam and the sliding connection of observation window and moving door frame, thereby realize the purpose of adjustable observation window position.

Description

Technical Field

[0001] This utility model belongs to the technical field of gantry machining equipment, and in particular relates to a protective device for gantry machining centers. Background Technology

[0002] Gantry machining centers are large, high-precision machine tools that integrate milling, boring, and drilling functions. During machining, the spindle speed can reach 8,000-24,000 r / min. The high-speed contact between the tool and the workpiece generates a large amount of metal cutting chips, as well as fragments generated by tool breakage during machining. These fragments can easily fly and injure people under high-speed rotation. At the same time, the movement of components such as the crossbeam and spindle box also poses a risk of mechanical collision. To meet the requirements of safe production, existing gantry machining centers are generally equipped with protective devices.

[0003] The position of the observation window on traditional protective devices is fixed. For example, Chinese utility model patent CN222154868U discloses a protective device for a gantry machining center, including a machine tool body, a base plate at the bottom of the machine tool body, a protective cover at the top of the base plate, a machining groove on one vertical surface of the protective cover, and a drive assembly on one vertical surface of the protective cover above the machining groove. The drive assembly includes a bidirectional screw, and first sliders are symmetrically arranged on the outer wall of the bidirectional screw. Each first slider has a blocking door at its lower part, and each blocking door has a second slider at its lower part. The second sliders are slidably connected to a limiting assembly, and each blocking door has an observation window. By using the drive assembly, the protective cover, and the blocking doors, the debris flying out of the machined workpiece can be blocked, thereby preventing the flying debris from causing injury to the operator.

[0004] The fixed position of the observation window cannot adapt to the dynamic machining operations in gantry machining, especially for scenarios that require continuous multi-process machining. Different parts of the workpiece may be distributed in different areas of the machine tool during the machining process. The fixed observation window cannot adjust the observation angle with the machining process, which will cause some processes to be in the operator's blind spot and affect the operator's real-time monitoring of the machining quality. Therefore, a protective device for gantry machining centers with an adjustable observation window position is needed. Utility Model Content

[0005] The purpose of this invention is to achieve the goal of allowing the observation window to move left, right, up, and down in the protective device by sliding the door frame and the crossbeam laterally and sliding the observation window and the door frame vertically. This solves the problem in the background technology where the observation window is fixed in position and cannot be adjusted according to the processing steps, which leads to some processes being in the operator's blind spot and affects the operator's real-time monitoring of processing quality.

[0006] The specific technical solution of this utility model is as follows:

[0007] A protective device for a gantry machining center includes two horizontal beams and two vertical beams. The two horizontal beams and two vertical beams are connected end to end to form a rectangular frame. The two horizontal beams are slidably connected to a movable door frame, which is a rectangular frame structure. Vertical shielding curtains are connected to the left and right sides of the movable door frame, and the ends of the vertical shielding curtains away from the movable door frame are connected to the vertical beams. The vertical shielding curtains are composed of several vertical protective components hinged together. An observation window with a rectangular cross-section is vertically slidably connected inside the movable door frame. The observation window has an observation hole, and a protective plate made of transparent material is embedded in the observation hole. Horizontal shielding curtains are connected to the upper and lower ends of the observation window, and the ends of the horizontal shielding curtains away from the observation window are connected to the movable door frame. The horizontal shielding curtains are composed of several horizontal protective components hinged together.

[0008] Furthermore, the upper and lower sides of the vertical protective component are respectively provided with first shafts, the first shafts are equipped with first connectors, and the first connectors are provided with two first shaft holes that are adapted to the first shafts. The two adjacent vertical protective components are hinged together by the hole-shaft cooperation between the first shafts and the first shaft holes.

[0009] Furthermore, the two crossbeams are respectively provided with a first linear groove on their facing surfaces. The first linear groove has a T-shaped cross section. The upper and lower surfaces of the movable door frame are respectively provided with a first slider that matches the first linear groove. The movable door frame achieves sliding connection with the two crossbeams through the sliding cooperation between the first slider and the first linear groove.

[0010] Furthermore, the upper and lower ends of the vertical protective component are provided with a first sliding member that is matched with the first linear slide groove. The first sliding member includes a first sliding shaft and a first limiting shaft located at the top of the first sliding shaft. The first sliding shaft and the first limiting shaft are cylinders.

[0011] Furthermore, the two adjacent vertical protective members are hinged together on the side where the first sliding member is located.

[0012] Furthermore, the two vertical beams are respectively provided with first positioning rods that are matched with the first shaft holes on their facing surfaces. The vertical beams are connected to the first connecting piece by the first positioning rods and the hole shafts of the first shaft holes. The left and right sides of the movable door frame are respectively provided with first positioning shafts that are matched with the first shaft holes. The movable door frame is connected to the first connecting piece by the first positioning shafts and the hole shafts of the first shaft holes.

[0013] Furthermore, the upper left and right sides and the lower left and right sides of the transverse protective component are respectively provided with second shafts, and the second shafts are equipped with second connectors. The second connectors are provided with two second shaft holes that are adapted to the second shafts. The two adjacent transverse protective components are hinged together by the engagement of the second shafts and the second shaft holes. The top and bottom surfaces of the movable door frame are respectively provided with second positioning rods that are matched with the second shaft holes. The movable door frame is connected to the second connectors by the engagement of the second positioning rods and the second shaft holes. The upper and lower end faces of the observation window are respectively provided with second positioning shafts that are matched with the second shaft holes. The observation window is connected to the second connectors by the engagement of the second positioning shafts and the second shaft holes.

[0014] Furthermore, the inner facades on the left and right sides of the movable door frame are provided with second linear grooves, the cross-section of which is T-shaped. The left and right facades of the observation window are respectively provided with second sliders that are matched with the second linear grooves. The observation window is slidably connected to the movable door frame through the sliding cooperation of the second sliders and the second linear grooves. The left and right sides of the transverse protective members are provided with second sliding members that are matched with the second linear grooves. The second sliding member includes a second sliding shaft and a second limiting shaft located at the top of the second sliding shaft. The second sliding shaft and the second limiting shaft are cylindrical. The side of the second sliding member between two adjacent transverse protective members is hinged to each other.

[0015] Furthermore, the left and right sides of the front facade of the observation window are respectively connected by locking rings, and the left and right sides of the front facade of the movable door frame are respectively provided with several slots that are used with the locking rings, and the slots are provided with locking blocks.

[0016] Furthermore, the crossbeam at the bottom is connected to several legs, the bottom of the legs is connected to several pulleys, the legs are provided with several threaded holes, the threaded holes are fitted with screws, and the bottom of the screws is provided with support seats.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] When in use, the protective device allows for adjustment of the horizontal position of the movable door frame by sliding it horizontally to the crossbeam, and the vertical position of the observation window by sliding it vertically to the movable door frame. This enables the observation window to move left, right, up, and down within the protective device. When the gantry machining center processes different parts of the workpiece, the operator can adjust the position of the observation window as needed to ensure real-time monitoring of the workpiece processing, thereby improving workpiece processing quality and efficiency. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0020] Figure 2This is an assembly diagram of the movable door frame, observation window, and horizontal blocking curtain in an embodiment of this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the support leg in an embodiment of the present utility model;

[0022] Figure 4 This is an assembly drawing of the crossbeam and vertical beam in an embodiment of this utility model;

[0023] Figure 5 This is a three-dimensional structural diagram of the movable door frame in an embodiment of this utility model;

[0024] Figure 6 This is an exploded view of the assembly of the observation window and the retaining ring in an embodiment of this utility model;

[0025] Figure 7 This is an exploded view of the assembly of the vertical protective component and the first connecting component in this embodiment of the present invention;

[0026] Figure 8 This is an exploded view of the assembly of the transverse protective member and the second connecting member in an embodiment of this utility model;

[0027] Figure label:

[0028] 1. Crossbeam; 11. First linear groove;

[0029] 2. Vertical beam; 21. First positioning rod;

[0030] 3. Vertical shielding curtain; 31. Vertical protective component; 311. First shaft; 312. First sliding component; 3121. First sliding shaft; 3122. First limiting shaft;

[0031] 4. Moving door frame; 41. First slider; 42. First positioning shaft; 43. Second positioning rod; 44. Second linear slide rail; 45. Slot; 46. Block;

[0032] 5. Observation window; 51. Observation hole; 52. Protective plate; 53. Second positioning shaft; 54. Second slider; 55. Snap ring;

[0033] 6. Horizontal shielding curtain; 61. Horizontal protective component; 611. Second shaft; 612. Second sliding component; 6121. Second sliding shaft; 6122. Second limiting shaft;

[0034] 7. First connecting piece; 71. First shaft hole;

[0035] 8. Second connecting piece; 81. Second shaft hole;

[0036] 9. Support leg; 91. Pulley; 92. Threaded hole; 93. Screw; 94. Support base. Detailed implementation method:

[0037] To better understand the purpose, structure, and function of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0038] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] See Figures 1 to 8This embodiment discloses a protective device for a gantry machining center, including two horizontal beams 1 and two vertical beams 2. The two horizontal beams 1 and the two vertical beams 2 are connected end to end to form a rectangular frame. The two horizontal beams 1 are slidably connected to a movable door frame 4. The movable door frame 4 is slidably connected to the two horizontal beams 1 on the left and right sides. The movable door frame 4 has a rectangular frame structure. Vertical shielding curtains 3 are connected to the left and right sides of the movable door frame 4, respectively. The vertical shielding curtains 3 provide protection. The end of the vertical shielding curtain 3 away from the movable door frame 4 is connected to the vertical beam 2. The vertical shielding curtain 3 is composed of several vertical protective members 31 hinged together. The height of the vertical protective members 31 is adapted to the distance between the upper and lower horizontal beams 1. When the movable door frame 4 moves to the left, the movable door... Several vertical protective components 31 on the left side of frame 4 are compressed, causing the vertical curtain 3 on the left side to retract, while several vertical protective components 31 on the right side of the sliding door frame 4 are pulled, causing the vertical curtain 3 on the right side to extend. Conversely, when the sliding door frame 4 moves to the right, several vertical protective components 31 on the right side of the sliding door frame 4 are compressed, causing the vertical curtain 3 on the right side to retract, while several vertical protective components 31 on the left side of the sliding door frame 4 are pulled, causing the vertical curtain 3 on the left side to extend. This ensures that the vertical curtains 3 on both sides can provide protection when the sliding door frame 4 moves left and right. An observation window 5 is vertically slidably connected inside the sliding door frame 4. The observation window 5 and the sliding door frame 4 are vertically slidably connected at the top and bottom. The cross-section of the observation window 5 is rectangular. 5. An observation window 51 is provided. The observation window 51 is circular, and its field of view is symmetrically distributed in 360°. Observers can obtain a balanced observation range from different angles (front, side). A protective plate 52 is embedded in the observation window 51. The protective plate 52 is made of transparent material. In this embodiment, the protective plate 52 is made of transparent acrylic material. Acrylic has a high light transmittance, far exceeding that of ordinary glass, and there is no obvious color difference when light passes through it, resulting in a clear and natural visual effect. Acrylic has a higher impact strength than ordinary glass, is not easy to break, and even if it breaks, it will form obtuse-angled fragments, making it much safer than glass. Horizontal shielding curtains 6 are connected to the upper and lower ends of the observation window 5. The end of the horizontal shielding curtain 6 away from the observation window 5 is connected to the movable door frame 4. The horizontal shielding curtain 6 is composed of several horizontal protective members 61 hinged together. The length of the horizontal protective members 61 is adapted to the internal width of the movable door frame 4. When the observation window 5 moves upward, the several horizontal protective members 61 above the observation window 5 are squeezed, causing the upper horizontal shielding curtain 6 to contract, while the several horizontal protective members 61 below the observation window 5 are pulled, causing the lower horizontal shielding curtain 6 to extend. Conversely, when the observation window 5 moves downward, the several horizontal protective members 61 below the observation window 5 are squeezed, causing the lower horizontal shielding curtain 6 to contract, while the several horizontal protective members 61 above the observation window 5 are pulled, causing the upper horizontal shielding curtain 6 to extend. This ensures that the horizontal shielding curtains 6 on both the upper and lower sides can play a protective role when the observation window 5 moves up and down.

[0040] The vertical protective member 31 has a first shaft 311 on its upper and lower sides respectively. The first shaft 311 is equipped with a first connector 7. The first connector 7 has two first shaft holes 71 that are adapted to the first shaft 311. The two adjacent vertical protective members 31 are hinged together by the first shaft 311 and the first shaft hole 71. When the vertical curtain 3 retracts or extends, the two adjacent vertical protective members 31 move closer and further away by hinge with the first connector 7.

[0041] The two crossbeams 1 are respectively provided with a first linear groove 11 on their facing surfaces. The first linear groove 11 has a T-shaped cross section. The T-shaped groove can increase the stability of the sliding trajectory. The upper and lower surfaces of the movable door frame 4 are respectively provided with a first slider 41 that matches the first linear groove 11. The movable door frame 4 achieves sliding connection with the two crossbeams 1 through the sliding cooperation between the first slider 41 and the first linear groove 11.

[0042] The upper and lower ends of the vertical protective member 31 are provided with a first sliding member 312 that is matched with the first linear slide groove 11. The first sliding member 312 includes a first sliding shaft 3121 and a first limiting shaft 3122 located at the top of the first sliding shaft 3121. The first sliding shaft 3121 and the first limiting shaft 3122 are cylinders. The cylindrical design is more conducive to the two adjacent vertical protective members 31 moving closer and further apart by rotation.

[0043] Two adjacent vertical protective members 31 are hinged to each other on one side of the first sliding member 312. This design allows the adjacent vertical protective members 31 to move closer to each other when the vertical curtain 3 is squeezed by the moving door frame 4, so that the vertical curtain 3 is folded.

[0044] Two vertical beams 2 are respectively provided with first positioning rods 21 that are matched with the first shaft holes 71 on their facing surfaces. In this embodiment, the upper and lower parts of the vertical beams 2 are respectively provided with first positioning rods 21 to improve stability. The vertical beams 2 are connected to the first connecting member 7 through the first positioning rods 21 and the hole shafts of the first shaft holes 71. The left and right sides of the movable door frame 4 are respectively provided with first positioning shafts 42 that are matched with the first shaft holes 71. In this embodiment, the upper and lower parts of the movable door frame 4 are respectively provided with first positioning shafts 42 to improve stability. The movable door frame 4 is connected to the first connecting member 7 through the first positioning shafts 42 and the hole shafts of the first shaft holes 71. The vertical beams 2 and the movable door frame 4 are respectively connected to the side of the vertical protective member 31 provided with the first sliding member 312 through the first connecting member 7. With this design, since the first sliding member 312 is restricted within the first linear slide groove 11, the overall stability of the vertical curtain 3 during stretching and compression is increased, and the smoothness of the operation of the sliding movable door frame 4 is improved.

[0045] The upper left and right sides and the lower left and right sides of the transverse protective member 61 are respectively provided with second shafts 611. The second shafts 611 are equipped with second connectors 8. The second connectors 8 are provided with two second shaft holes 81 that are adapted to the second shafts 611. The two adjacent transverse protective members 61 are hinged together by the engagement of the second shafts 611 and the second shaft holes 81. The top and bottom facing surfaces of the movable door frame 4 are respectively provided with second positioning rods 43 that are matched with the second shaft holes 81. The movable door frame 4 is connected to the second connectors 8 by the engagement of the second positioning rods 43 and the second shaft holes 81. The upper and lower end faces of the observation window 5 are respectively provided with second positioning shafts 53 that are matched with the second shaft holes 81. The observation window 5 is connected to the second connectors 8 by the engagement of the second positioning shafts 53 and the second shaft holes 81. The inner surfaces of the left and right sides of the movable door frame 4 are respectively provided with second linear grooves. 44. The second linear slide 44 has a T-shaped cross section. The left and right sides of the observation window 5 are respectively provided with second sliders 54 that are used in conjunction with the second linear slide 44. The observation window 5 is slidably connected to the movable door frame 4 through the sliding cooperation between the second sliders 54 and the second linear slide 44. The left and right sides of the horizontal protective member 61 are provided with second sliding members 612 that are used in conjunction with the second linear slide 44. The second sliding member 612 includes a second sliding shaft 6121 and a second limiting shaft 6122 located at the top of the second sliding shaft 6121. The second sliding shaft 6121 and the second limiting shaft 6122 are cylinders. The side of the second sliding member 61 between two adjacent horizontal protective members 61 is hinged to each other. The principle of the observation window 5 sliding up and down in the movable door frame 4 is similar to the principle of the movable door frame 4 sliding between the two crossbeams 1. The working principle of the horizontal shielding curtain 6 is the same as the working principle of the vertical shielding curtain 3.

[0046] The observation window 5 has rotatably connected retaining rings 55 on the left and right sides of its front facade. The retaining rings 55 have hinge rods at their upper and lower ends. The observation window 5 has positioning holes on the left and right sides of its front facade that are adapted to the hinge rods. The retaining rings 55 are rotatably connected to the observation window 5 through the engagement of the hinge rods with the positioning holes. The sliding door frame 4 has several slots 45 on the left and right sides of its front facade that are used with the retaining rings 55. The slots 45 on the same side of the front facade of the sliding door frame 4 are arranged in a vertical linear array. The slots 45 on the left and right sides of the front facade of the sliding door frame 4 are arranged opposite each other. The slots 45 have locking blocks 46 inside. When the operator holds the retaining rings 55 and adjusts the observation window 5 to a suitable position, the retaining rings 55 are put on the locking blocks 46 to fix the position of the observation window 5. It can be further optimized that the front facade of the locking blocks 46 is curved, which helps to put the retaining rings 55 on the locking blocks 46.

[0047] The crossbeam 1 at the bottom is connected to several legs 9. Further optimization is possible by having several threaded mounting holes on the lower surface of the crossbeam 1, and threaded rods on the legs 9 that mate with these holes. The legs 9 are threadedly connected to the crossbeam 1. By rotating the legs 9, the overall height of the protective device can be adjusted. Several pulleys 91 are connected to the legs 9, facilitating the movement of the protective device. Several threaded holes 92 are provided on the legs 9, with screws 93 installed within them. A support base 94 is located at the bottom of the screw 93. When the protective device is in use, rotating the screw 93 causes the lower surface of the support base 94 to contact the ground, raising the entire protective device and disengaging the pulleys 91 from the ground, thus improving the stability of the protective device during use. Further optimization is possible by having a screwing part at the top of the screw 93 for easy screwing operation.

[0048] In this embodiment, the vertical shielding curtain 3, the horizontal shielding curtain 6, the movable door frame 4, and the observation window 5 are all made of aluminum alloy, which has the advantages of being lightweight and high-strength. While ensuring the protective effect, it reduces the weight of the protective device and makes it easier for users to operate.

[0049] Working principle: When the protective device is in use, the horizontal position of the movable door frame 4 can be adjusted by the horizontal sliding connection between the movable door frame 4 and the crossbeam 1. The vertical position of the observation window 5 can be adjusted by the vertical sliding connection between the observation window 5 and the movable door frame 4. The position of the observation window 5 is fixed by the cooperation of the retaining ring 55 and the retaining block 46, so as to realize the purpose of moving the observation window 5 left, right, up and down in the protective device.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A guard for a gantry machining center, characterized in that: It includes two horizontal beams (1) and two vertical beams (2). The two horizontal beams (1) and the two vertical beams (2) are connected end to end to form a rectangular frame. The two horizontal beams (1) are slidably connected to a movable door frame (4). The movable door frame (4) is a rectangular frame structure. Vertical curtains (3) are connected to the left and right sides of the movable door frame (4). The end of the vertical curtain (3) away from the movable door frame (4) is connected to the vertical beam (2). The vertical curtain (3) is composed of several vertical protective parts (31) hinged together. A vertically sliding observation window (5) is connected inside the movable door frame (4). The observation window (5) has a rectangular cross section and an observation hole (51). A protective plate (52) is embedded in the observation hole (51). The protective plate (52) is made of transparent material. Horizontal shielding curtains (6) are connected to the upper and lower ends of the observation window (5). The end of the horizontal shielding curtain (6) away from the observation window (5) is connected to the movable door frame (4). The horizontal shielding curtain (6) is composed of several horizontal protective parts (61) hinged together.

2. Guard for a gantry machining center according to claim 1, characterized in that, The vertical protective member (31) has a first shaft (311) on its upper and lower sides respectively. The first shaft (311) is equipped with a first connector (7). The first connector (7) has two first shaft holes (71) that are adapted to the first shaft (311). The two adjacent vertical protective members (31) are hinged together by the hole-shaft cooperation between the first shaft (311) and the first shaft hole (71).

3. Guard for gantry machining centers according to claim 2, characterized in that, The two crossbeams (1) are respectively provided with a first linear groove (11) on their facing surfaces. The first linear groove (11) has a T-shaped cross section. The upper and lower surfaces of the movable door frame (4) are respectively provided with a first slider (41) that matches the first linear groove (11). The movable door frame (4) achieves sliding connection with the two crossbeams (1) through the sliding cooperation between the first slider (41) and the first linear groove (11).

4. Guard for gantry machining centers according to claim 3, characterized in that, The upper and lower ends of the vertical protective member (31) are provided with a first sliding member (312) that is used in conjunction with the first linear slide groove (11). The first sliding member (312) includes a first sliding shaft (3121) and a first limiting shaft (3122) located at the top of the first sliding shaft (3121). The first sliding shaft (3121) and the first limiting shaft (3122) are cylinders.

5. The guard device for a gantry machining center according to claim 4, characterized in that, Two adjacent vertical protective members (31) are hinged to each other on one side of the first sliding member (312).

6. The guard device for a gantry machining center according to claim 2, characterized in that, Two vertical beams (2) are respectively provided with a first positioning rod (21) that is matched with the first shaft hole (71) on their facing surfaces. The vertical beams (2) are connected to the first connector (7) through the first positioning rod (21) and the hole shaft of the first shaft hole (71). The left and right sides of the movable door frame (4) are respectively provided with a first positioning shaft (42) that is matched with the first shaft hole (71). The movable door frame (4) is connected to the first connector (7) through the first positioning shaft (42) and the hole shaft of the first shaft hole (71).

7. The guard device for a gantry machining center according to claim 1, characterized in that, The upper left and right sides and the lower left and right sides of the transverse protective member (61) are respectively provided with second shafts (611). The second shafts (611) are equipped with second connectors (8). The second connectors (8) are provided with two second shaft holes (81) that are adapted to the second shafts (611). The two adjacent transverse protective members (61) are hinged together by the hole-shaft cooperation between the second shafts (611) and the second shaft holes (81). The top and bottom of the movable door frame (4) are respectively provided with second shafts (611) and second shaft holes (81). Each of the two ends of the observation window (5) is provided with a second positioning rod (43) that is matched with the second shaft hole (81). The movable door frame (4) is connected to the second connector (8) through the second positioning rod (43) and the hole shaft of the second shaft hole (81). The upper and lower ends of the observation window (5) are provided with a second positioning shaft (53) that is matched with the second shaft hole (81). The observation window (5) is connected to the second connector (8) through the second positioning shaft (53) and the hole shaft of the second shaft hole (81).

8. Guard for gantry machining centers according to claim 7, characterized in that, The inner facades of the movable door frame (4) on the left and right sides are provided with second linear grooves (44), the cross section of the second linear grooves (44) is T-shaped. The left and right facades of the observation window (5) are respectively provided with second sliders (54) that are matched with the second linear grooves (44). The observation window (5) is slidably connected to the movable door frame (4) through the sliding cooperation between the second sliders (54) and the second linear grooves (44). The left and right sides of the transverse protective member (61) are provided with second sliding members (612) that are matched with the second linear grooves (44). The second sliding member (612) includes a second sliding shaft (6121) and a second limiting shaft (6122) located at the top of the second sliding shaft (6121). The second sliding shaft (6121) and the second limiting shaft (6122) are cylinders. The side of the second sliding member (612) between two adjacent transverse protective members (61) is hinged to each other.

9. The guard device for a gantry machining center according to claim 1, characterized in that, The observation window (5) has rotatably connected locking rings (55) on the left and right sides of the front facade. The movable door frame (4) has several slots (45) on the left and right sides of the front facade that are used with the locking rings (55). The slots (45) are equipped with locking blocks (46).

10. The guard for a gantry machining center of claim 1, wherein, The crossbeam (1) at the bottom is connected to several legs (9), and the bottom of the legs (9) is connected to several pulleys (91). The legs (9) are provided with several threaded holes (92), and a screw (93) is provided in the threaded hole (92). The bottom of the screw (93) is provided with a support seat (94).

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