Machine tool upper and lower protection sliding door device and machine tool

Abstract

The utility model provides a machine tool upper and lower protection sliding door device and a machine tool. The upper and lower protective sliding door device of the machine tool comprises an upper sliding door, a lower sliding door, a front protective cover with a door frame, a sliding door driving structure, an upper sliding door closing in-place limiting block, an upper sliding door opening in-place limiting block and a lower sliding door closing in-place limiting block. The top of the lower moving door is sleeved with the upper moving door, and the moving door driving structure is installed on the front protective cover with the door frame, connected with the lower moving door and used for driving the lower moving door to move up and down. The protective door is of an upper-lower double-layer moving door structure instead of a left-right door structure, a large space is not occupied, the total height size of the upper-lower double-layer moving door can be compressed when the upper-lower double-layer moving door is opened, and the design of the double-layer automatic moving door with small space and large stroke is further achieved.

Description

Technical Field

[0001] The utility model relates to a machining center machine tool, specifically, to an upper and lower protective sliding door device for a machine tool and a machine tool, especially to an upper and lower protective sliding door device for a machine tool with a locking mechanism and a machine tool, and particularly to an upper and lower movable double-layer protective door structure for a machining center machine tool and the machine tool. Background Art

[0002] As customers' requirements for automation and safety performance in machining center machines increase, their requirements for protective design are also becoming increasingly higher. To meet these requirements, the machining center's processing chamber design adopts a fully protected form. Depending on the size of the workpiece, loading and unloading methods, and other factors, the structure of the protective sliding door also varies. Currently, the most commonly used machine tool protective door forms are double-door structures or left-right sliding doors. However, double-door structures or left-right sliding doors often require a larger floor space and are not suitable for working conditions where the protective sliding door requires a large opening degree and the processing chamber space is compact.

[0003] Patent document CN101837556 discloses a pneumatically controlled double-door protection device, comprising: a left sliding door and a right sliding door and door glass on the doors; further comprising: a fully protective left cover and a fully protective right cover; the left sliding door and the right sliding door are respectively arranged on the inner sides of the fully protective left cover and the fully protective right cover; the upper and lower sides of the left sliding door and the right sliding door are respectively arranged on the lower door track and the upper guide rail; one end of the left and right pull rods are respectively connected to the upper ends of the left sliding door and the right sliding door; the other ends of the left and right pull rods are connected to a pull rod cylinder; the pull rod cylinder is connected to a controller that controls the pull rod cylinder; however, this patent still adopts a left-right sliding door structure, which is still not suitable for use in situations where the automated production line site is compact and the site usage area is small. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a machine tool upper and lower protective sliding door device and a machine tool.

[0005] According to the utility model, a machine tool upper and lower protective sliding door device is provided, comprising: an upper sliding door, a lower sliding door, a front protective cover with a door frame, a sliding door driving structure, an upper sliding door closing position limit block, an upper sliding door opening position limit block and a lower sliding door closing position limit block;

[0006] The top of the lower sliding door is sleeved inside the upper sliding door, and the sliding door driving structure is installed on the front protective cover with the door frame and is connected to the lower sliding door for driving the lower sliding door to move up and down;

[0007] The upper and lower protective sliding door device of the machine tool includes a closed state and an open state. When switching from the closed state to the open state, the sliding door driving structure drives the lower sliding door to move upward. When the top of the lower sliding door collides with the top of the upper sliding door, the lower sliding door drives the upper sliding door to move upward until the upper sliding door collides with the upper sliding door opening position limit block, and the sliding door device is completely switched to the open state;

[0008] When switching from the open state to the closed state, the sliding door driving structure cooperates with gravity to drive the lower sliding door to move downward. As the lower sliding door moves downward, the upper sliding door also moves downward until the upper sliding door collides with the upper sliding door closed position limit block, and the upper sliding door stops moving; the lower sliding door continues to move downward until the lower sliding door collides with the lower sliding door closed position limit block, and the sliding door device is completely switched to the closed state.

[0009] Preferably, the sliding door drive structure includes a motor, a reducer, a main sprocket, a first idler sprocket, a first sprocket shaft, a first chain, a first connecting plate, a second connecting plate, a first guide rail of an automatic sensing component, a second chain, a second idler sprocket, a second sprocket shaft, a third idler sprocket, and a third sprocket shaft;

[0010] The motor is mounted on the front protective cover with the door frame, the motor connecting shaft is connected to the reducer, a main sprocket is mounted on the reducer driving shaft, a first idler sprocket is directly below the main sprocket, the first idler sprocket is mounted on the first sprocket shaft, and the first sprocket shaft is mounted on the front protective cover with the door frame;

[0011] A first chain is installed between the main sprocket and the first idler sprocket, the first chain is installed vertically, both ends of the first chain are connected to the first connecting plate to close the first chain, the first connecting plate is connected to the second connecting plate, the second connecting plate is installed on the first guide rail slider, the first guide rail is vertically installed on the front protective cover with the door frame, the upper end of the second connecting plate is connected to the second chain, the second chain passes vertically through the second idler sprocket, the second idler sprocket is installed on the second sprocket shaft, and the second sprocket shaft is installed on the front protective cover with the door frame;

[0012] The second idler sprocket is above the second connecting plate, the second chain is turned through the third idler sprocket, and is connected vertically downward to the top of the lower movable door. The third idler sprocket and the second idler sprocket are on the same horizontal plane. The third idler sprocket is installed on the third sprocket shaft, and the third sprocket shaft is installed on the front protective cover with the door frame.

[0013] Preferably, it further includes a second guide rail; the number of the second guide rails is 2, which are vertically installed on both sides of the door frame, and the upper movable door is slidably connected to the second guide rails.

[0014] Preferably, it also includes a transition plate;

[0015] The upper movable door is slidably connected to the second guide rail via a transition plate.

[0016] Preferably, it further includes a third guide rail;

[0017] The number of the third guide rails is two, which are respectively vertically mounted on both sides of the door frame, and the lower movable door is slidably connected to the third guide rails.

[0018] Preferably, it further comprises an anti-falling locking mechanism, which is mounted on the front protective cover with the door frame, and the number of the anti-falling locking mechanisms is two, which are respectively located on both sides of the third idle sprocket;

[0019] There are square frames welded on both sides of the top of the lower sliding door;

[0020] The anti-fall locking mechanism includes a cylinder, a cylinder connecting base and a guide pin, the cylinder is installed on the cylinder connecting base, the guide pin is connected to the cylinder rod, and the guide pin is guided by the cylinder connecting base; the square frame can match the guide pin.

[0021] Preferably, it further comprises an automatic sensing component, wherein the automatic sensing component comprises a first sensing block, a first proximity switch, a second sensing block, and a second proximity switch;

[0022] A first sensing block is mounted on one side of the lower end of the lower movable door, and a first proximity switch is mounted on the front protective cover with the door frame. When the lower movable door moves until the first sensing block matches the first proximity switch, the upper and lower protective sliding door device of the machine tool is in a closed state;

[0023] A second sensing block is installed on the top of the lower movable door, and a second proximity switch is installed on the front protective cover with a door frame. When the lower movable door moves to the point where the second sensing block and the second proximity switch match each other, the upper and lower protective sliding door device of the machine tool is in an open state;

[0024] Preferably, it also includes a first water baffle, a third water baffle, a second water baffle and a fourth water baffle; the first water baffle and the third water baffle are both installed on the front protective cover with the door frame, and the second water baffle and the fourth water baffle are respectively installed on the upper moving door and the lower moving door.

[0025] Preferably, a non-metallic collision block is installed on the top of the lower sliding door, and the lower sliding door collides or contacts with the top of the upper sliding door through the non-metallic collision block.

[0026] The utility model also provides a machine tool structure, which adopts the machine tool upper and lower protective sliding door device.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The protective door of the utility model adopts an upper and lower double-layer sliding door structure rather than a left and right door structure, which does not need to take up a lot of space. In addition, the utility model can compress the total height of the upper and lower double-layer sliding doors when they are opened, further realizing the design of a double-layer automatic sliding door with a small space and a large stroke.

[0029] 2. The utility model is designed with an anti-fall locking mechanism, which can lock the sliding door when the door is fully open, making the operation safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0031] Figure 1 This is a schematic diagram of the structure of the present invention, in which the first water retaining plate, the second water retaining plate and the third water retaining plate are hidden;

[0032] Figure 2 This is a schematic diagram of the structure of the utility model after the lower movable door, the upper movable door, the first water retaining plate, the second water retaining plate and the third water retaining plate are hidden;

[0033] Figure 3 This is a structural schematic diagram of a sectional view of a positive triaxial drawing of the present utility model;

[0034] Figure 4 for Figure 1 Schematic diagram of the enlarged view of the local structure at point A in the middle.

[0035] The figure shows:

[0036] Upper sliding door 1 Lower sliding door 2 Front protective cover with door frame 3 Motor 4 Reducer 5 Main sprocket 7

[0037] First idle sprocket 8 First support 9 First chain 10 First connecting plate 11 Second connecting plate 12

[0038] First guide rail 13 Second chain 14 Second idle sprocket 15 Second support 16 Third idle sprocket 17

[0039] Third support installation 18 transition plate 19 second guide rail 20 third guide rail 21 first sensor block 22

[0040] First proximity switch 23 Second sensor block 24 Second proximity switch 25 Anti-fall locking mechanism 26

[0041] Anti-fall locking mechanism bracket 27 upper movable door opening position limit block 29

[0042] Lower moving door closed in place limit block 30 Upper moving door closed in place limit block 31 limit block bracket 32

[0043] Non-metallic collision block 33 frame 34 guide pin 35 cylinder 36 cylinder connecting base 37

[0044] First water baffle 38 Second water baffle 39 Third water baffle 40 Fourth water baffle 41 DETAILED DESCRIPTION

[0045] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.

[0046] The utility model provides a machine tool upper and lower protective sliding door device, such as Figure 1-4 As shown, it includes: an upper movable door 1, a lower movable door 2, a front protective cover 3 with a door frame, a sliding door driving structure, an upper movable door closing position limit block 31, an upper movable door opening position limit block 29 and a lower movable door closing position limit block 30;

[0047] The top of the lower sliding door 2 is sleeved inside the upper sliding door 1, and the sliding door driving structure is installed on the front protective cover 3 with the door frame and is connected to the lower sliding door 2 for driving the lower sliding door 2 to move up and down;

[0048] The upper and lower protective sliding door device of the machine tool includes a closed state and an open state. When switching from the closed state to the open state, the sliding door driving structure drives the lower sliding door 2 to move upward. When the top of the lower sliding door 2 collides with the top of the upper sliding door 1, the lower sliding door 2 drives the upper sliding door 1 to move upward until the upper sliding door 1 collides with the upper sliding door opening position limit block 29, and the sliding door device is completely switched to the open state;

[0049] When switching from the open state to the closed state, the sliding door drive structure cooperates with gravity to drive the lower sliding door 2 downward. As the lower sliding door 2 moves downward, the upper sliding door 1 also moves downward under the action of gravity until the upper sliding door 1 hits the upper sliding door closed position stop 31, and the upper sliding door 1 stops moving. The lower sliding door 2 continues to move downward until it hits the lower sliding door closed position stop 30, and the sliding door device is completely switched to the closed state. In the closed state, the top of the lower sliding door 2 is inserted into the upper sliding door 1, and the bottom end of the upper sliding door 1 is lower than the top end of the lower sliding door 2.

[0050] In a preferred example, the lower moving door 2 does not collide directly with the upper moving door 1, but through a non-metallic impact block 33, that is, a non-metallic impact block 33 is installed on the top of the lower moving door 2, and the lower moving door 2 collides or contacts with the top of the upper moving door 1 through the non-metallic impact block 33.

[0051] The sliding door drive structure includes a motor 4, a reducer 5, a main sprocket 7, a first idler sprocket 8, a first sprocket shaft, a first chain 10, a first connecting plate 11, a second connecting plate 12, a first guide rail 13, a second chain 14, a second idler sprocket 15, a second sprocket shaft, a third idler sprocket 17, and a third sprocket shaft;

[0052] The motor 4 is mounted on the front protective cover 3 with a door frame, and the motor connecting shaft is connected to the reducer 5. The reducer 5 is mounted on the front protective cover 3 with a door frame through a reducer support 6. A main sprocket 7 is mounted on the drive shaft of the reducer 5. A first idler sprocket 8 is directly below the main sprocket 7. The first idler sprocket 8 is mounted on the first sprocket shaft through a bearing structure. The first sprocket shaft is mounted on the front protective cover 3 with a door frame through a first support 9.

[0053] A first chain 10 is installed between the main sprocket 7 and the first idler sprocket 8. The first chain 10 is installed vertically. Both ends of the first chain 10 are connected to a first connecting plate 11 to close the first chain 10. The first connecting plate 11 is connected to a second connecting plate 12. The second connecting plate 12 is installed on a first guide rail 13 slider. The first guide rail 13 is vertically installed on the front protective cover 3 with a door frame. The upper end of the second connecting plate 12 is connected to a second chain 14. The second chain 14 passes vertically through a second idler sprocket 15. The second idler sprocket 15 is installed on a second sprocket shaft through a bearing structure. The second sprocket shaft is installed on the front protective cover 3 with a door frame through a second support 16.

[0054] The second idler sprocket 15 is above the second connecting plate 12, and the second chain 14 is deflected by the third idler sprocket 17 and connected vertically downward to the top of the lower movable door 2. The third idler sprocket 17 and the second idler sprocket 15 are on the same horizontal plane. The third idler sprocket 17 is installed on the third sprocket shaft through a bearing structure, and the third sprocket shaft is installed on the front protective cover 3 with the door frame through the third support mount 18.

[0055] The machine tool upper and lower protective sliding door device also includes a second guide rail 20 and a third guide rail 21. There are two second guide rails 20, one vertically mounted on either side of the door frame. The upper movable door 1 is slidably connected to the second guide rails 20 via a transition plate 19. Specifically, the transition plate 19 is mounted on a slider on the second guide rail 20. There are two third guide rails 21, one vertically mounted on either side of the door frame. The lower movable door 2 is slidably connected to the third guide rails 21.

[0056] The upper and lower protective sliding door device of the machine tool also includes an anti-falling locking mechanism 26, which is installed on the front protective cover 3 with a door frame through an anti-falling locking mechanism bracket 27, and the number of the anti-falling locking mechanisms 26 is 2, and the 2 anti-falling locking mechanisms 26 are respectively located on both sides of the third idle sprocket 17; square frames 34 are welded on both sides of the top of the lower sliding door 2; the anti-falling locking mechanism 26 includes a cylinder 36, a cylinder connecting base 37 and a guide pin 35, the cylinder 36 is installed on the cylinder connecting base 37, the guide pin 35 is connected to the cylinder rod of the cylinder 36, and the guide pin 35 is guided by the cylinder connecting base 37; the square frame 34 can match the guide pin 35.

[0057] In a preferred example, the upper movable door opening limit block 29 is installed on the anti-falling locking mechanism 26; the lower movable door closing limit block 30 is installed under the door frame; the upper movable door closing limit block 31 is installed in the middle of both sides of the door frame. Specifically, the upper movable door closing limit block 31 is installed on the front protective cover 3 with the door frame through the limit block bracket 32.

[0058] The machine tool vertical protective sliding door device also includes an automatic sensing component, which includes a first sensing block 22, a first proximity switch 23, a second sensing block 24, and a second proximity switch 25. The first sensing block 22 is mounted on one side of the lower end of the lower sliding door 2, and the first proximity switch 23 is mounted on the front protective cover 3 with the door frame. When the lower sliding door 2 moves to the point where the first sensing block 22 and the first proximity switch 23 match each other, the machine tool vertical protective sliding door device is in a closed state.

[0059] The second sensing block 24 is installed on the top of the lower movable door 2, and the front protective cover 3 with the door frame is installed with a second proximity switch 25. When the lower movable door 2 moves to the point where the second sensing block 24 and the second proximity switch 25 match each other, the upper and lower protective sliding door device of the machine tool is in the open state;

[0060] The upper and lower protective sliding door device of the machine tool also includes a first water baffle 38, a third water baffle 40, a second water baffle 39 and a fourth water baffle 41; the first water baffle 38 and the third water baffle 40 are both installed on the front protective cover 3 with the door frame, and the second water baffle 39 and the fourth water baffle 41 are respectively installed on the upper sliding door 1 and the lower sliding door 2.

[0061] The working process of the utility model is as follows: during the working process, when the upper and lower double-layer sliding doors need to be opened, the motor 4 drives the main sprocket 7 to operate through the reducer 5, the main sprocket 7 drives the first chain 10, the first chain 10 drives the driven first idler sprocket 8 to rotate, the first chain 10 drives the first connecting plate 11 to move downward, the first connecting plate 11 drives the second connecting plate 12 to move downward together, the second connecting plate 12 drives the second chain 14 to move, the second chain 14 drives the lower sliding door 2 to rise, and the non-metallic collision block 33 on the top of the lower sliding door 2 collides with the top of the upper sliding door 1, And drive the upper moving door 1 to move up at the same speed, and the upper moving door 1 stops moving when it collides with the door opening limit block 29. The two moving doors are opened to the full position. At the same time, the proximity switch 25 senses the sensing block 24, and the proximity switch 25 sends a door opening position signal. The motor 4 stops running, and the cylinder rods 36 of the anti-fall locking mechanisms 26 on both sides are pushed out. The guide pin 35 is pushed out along with the cylinder rod 36. The guide pin 35 is guided by the cylinder connecting base 37, and the guide pin 35 is inserted into the box 34 at the top of the lower moving door, locking the lower moving door 2 to prevent the upper and lower double-layer sliding doors from falling off due to external reasons.

[0062] When the upper and lower double-layer sliding doors need to be closed, the anti-fall locking mechanisms 26 on both sides are closed at the same time, the guide latch 35 is pulled out from the box 34 at the top of the lower sliding door 2, and the motor 4 starts to rotate in the opposite direction. The motor 4 drives the main sprocket to rotate in the opposite direction through the reducer 5, and the main sprocket 7 drives the first chain 10 to start moving upward, and the first connecting plate 11 drives the second connecting plate 12 to move upward together. The upper and lower double-layer sliding doors move downward due to gravity, tightening the second chain 14. When the lower part of the upper sliding door 1 collides with the upper sliding door closed in place limit block 31, it stops moving downward, and the lower sliding door 2 continues to move downward. When the lower sliding door 2 collides with the door closed in place limit block 30, the lower sliding door 2 stops moving. At the same time, the proximity switch 23 senses the first sensing block 22 on the lower sliding door 2, and sends a lower sliding door 2 closed in place signal, and the motor 4 stops running.

[0063] The utility model is suitable for use in machining centers with a high degree of automation, where space is limited and a large opening of the automatic loading door is required, and safety and stability are required. The utility model can also prevent cutting fluid from leaking outside the machine tool protection through the design of the water baffle.

[0064] The protective door of the utility model adopts an upper and lower double-layer sliding door structure, which can lock the upper and lower double-layer sliding door when opened, and the total height dimension is compressed, realizing the design of a double-layer automatic sliding door with a small space and a large stroke; and the upper and lower moving double-layer protective door device has an interlocking device when the protective door is fully opened, and the anti-falling mechanism locks the sliding door, which is safe and reliable in operation. In addition, the double sliding door of the utility model can also prevent cutting fluid from leaking through the sliding door to the outside of the machine tool protection through the water baffle. In summary, the upper and lower double-layer sliding door of the utility model has a large opening space, occupies a small space, and is safe and reliable.

[0065] The utility model also provides a machine tool structure, which is characterized by adopting the machine tool upper and lower protective sliding door device.

[0066] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0067] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A machine tool upper and lower protective sliding door device, characterized in that: include: An upper movable door (1), a lower movable door (2), a front protective cover with a door frame (3), a sliding door driving structure, an upper movable door closing position limiting block (31), an upper movable door opening position limiting block (29), and a lower movable door closing position limiting block (30); The top of the lower movable door (2) is sleeved inside the upper movable door (1); the sliding door driving structure is installed on the front protective cover (3) with the door frame and is connected to the lower movable door (2) for driving the lower movable door (2) to move up and down; The upper and lower protective sliding door device of the machine tool includes a closed state and an open state. When switching from the closed state to the open state, the sliding door driving structure drives the lower sliding door (2) to move upward. When the top of the lower sliding door (2) collides with the top of the upper sliding door (1), the lower sliding door (2) drives the upper sliding door (1) to move upward until the upper sliding door (1) collides with the upper sliding door opening position limit block (29), and the sliding door device is completely switched to the open state. When switching from an open state to a closed state, the sliding door driving structure cooperates with gravity to drive the lower sliding door (2) to move downward. As the lower sliding door (2) moves downward, the upper sliding door (1) also moves downward until the upper sliding door (1) collides with the upper sliding door closed position limit block (31), and the upper sliding door (1) stops moving; the lower sliding door (2) continues to move downward until the lower sliding door (2) collides with the lower sliding door closed position limit block (30), and the sliding door device is completely switched to the closed state.

2. The machine tool upper and lower protective sliding door device according to claim 1, characterized in that: The sliding door driving structure comprises a motor (4), a speed reducer (5), a main sprocket (7), a first idle sprocket (8), a first sprocket shaft, a first chain (10), a first connecting plate (11), a second connecting plate (12), a first guide rail (13), a second chain (14), a second idle sprocket (15), a second sprocket shaft, a third idle sprocket (17), and a third sprocket shaft; The motor (4) is mounted on the front protective cover (3) with the door frame, the motor connecting shaft is connected to the reducer (5), a main sprocket (7) is mounted on the drive shaft of the reducer (5), a first idler sprocket (8) is located directly below the main sprocket (7), the first idler sprocket (8) is mounted on a first sprocket shaft, and the first sprocket shaft is mounted on the front protective cover (3) with the door frame; A first chain (10) is installed between the main sprocket (7) and the first idler sprocket (8), the first chain (10) is installed vertically, both ends of the first chain (10) are connected to a first connecting plate (11) to close the first chain (10), the first connecting plate (11) is connected to a second connecting plate (12), the second connecting plate (12) is installed on a first guide rail (13) slider, the first guide rail (13) is vertically installed on a front protective cover (3) with a door frame, the upper end of the second connecting plate (12) is connected to a second chain (14), the second chain (14) passes vertically through a second idler sprocket (15), the second idler sprocket (15) is installed on a second sprocket shaft, and the second sprocket shaft is installed on the front protective cover (3) with a door frame; The second idle sprocket (15) is above the second connecting plate (12), and the second chain (14) is turned through the third idle sprocket (17) and vertically connected to the top of the lower movable door (2). The third idle sprocket (17) and the second idle sprocket (15) are on the same horizontal plane. The third idle sprocket (17) is installed on the third sprocket shaft, and the third sprocket shaft is installed on the front protective cover (3) with the door frame.

3. The machine tool upper and lower protective sliding door device according to claim 2, characterized in that: It also includes a second guide rail (20); the number of the second guide rails (20) is two, which are vertically installed on both sides of the door frame respectively, and the upper movable door (1) is slidably connected to the second guide rails (20).

4. The machine tool upper and lower protective sliding door device according to claim 3, characterized in that: Also included is a transition plate (19); The upper movable door (1) is slidably connected to the second guide rail (20) via a transition plate (19).

5. The machine tool upper and lower protective sliding door device according to claim 1, characterized in that: Also includes a third guide rail (21); There are two third guide rails (21), which are respectively vertically mounted on both sides of the door frame, and the lower movable door (2) is slidably connected to the third guide rails (21).

6. The machine tool upper and lower protective sliding door device according to claim 2, characterized in that: It also includes an anti-falling locking mechanism (26), which is installed on the front protective cover (3) with a door frame, and the number of the anti-falling locking mechanisms (26) is two, and the two anti-falling locking mechanisms (26) are respectively located on both sides of the third idle sprocket (17); Square frames (34) are welded on both sides of the top of the lower movable door (2); The anti-fall-off locking mechanism (26) comprises a cylinder (36), a cylinder connecting base (37) and a guide latch (35), wherein the cylinder (36) is mounted on the cylinder connecting base (37), the guide latch (35) and the cylinder rod of the cylinder (36) are connected, and the guide latch (35) is guided by the cylinder connecting base (37); and the square frame (34) can match the guide latch (35).

7. The machine tool upper and lower protective sliding door device according to claim 1, characterized in that: It also includes an automatic sensing component, which includes a first sensing block (22), a first proximity switch (23), a second sensing block (24), and a second proximity switch (25); A first sensing block (22) is mounted on one side of the lower end of the lower movable door (2), and a first proximity switch (23) is mounted on the front protective cover (3) with a door frame. When the lower movable door (2) moves until the first sensing block (22) and the first proximity switch (23) match each other, the upper and lower protective sliding door device of the machine tool is in a closed state. A second sensing block (24) is installed on the top of the lower movable door (2), and a second proximity switch (25) is installed on the front protective cover (3) with a door frame. When the lower movable door (2) moves until the second sensing block (24) and the second proximity switch (25) match each other, the upper and lower protective sliding door device of the machine tool is in an open state.

8. The machine tool upper and lower protective sliding door device according to claim 1, characterized in that: The invention also comprises a first water baffle (38), a third water baffle (40), a second water baffle (39) and a fourth water baffle (41); the first water baffle (38) and the third water baffle (40) are both mounted on the front protective cover (3) with the door frame, and the second water baffle (39) and the fourth water baffle (41) are respectively mounted on the upper movable door (1) and the lower movable door (2).

9. The machine tool upper and lower protective sliding door device according to claim 1, characterized in that: A non-metallic collision block (33) is installed on the top of the lower movable door (2), and the lower movable door (2) collides or contacts with the top of the upper movable door (1) through the non-metallic collision block (33).

10. A machine tool structure, characterized in that: A machine tool upper and lower protective sliding door device according to any one of claims 1 to 9 is used.

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