A vertical machining center cylinder protection automatic door device

Abstract

The utility model discloses a vertical machining center cylinder protection automatic door device relates to lathe technical field, include: the protection door, the sliding setting in the opening of protection interval, cylinder transmission subassembly, set up in the top of protection door, wherein including three five -way medium -leak solenoid valve and telescopic cylinder, three five -way medium -leak solenoid valve one end is provided with silencer, the other end is connected with telescopic cylinder, and the output of telescopic cylinder is connected with protection door, limit switch subassembly, set up in the top of protection door, wherein including a pair of limit switch and limit block, limit block sets up on protection door, when protection door reaches the door opening position, limit block and a limit switch abut, when protection door reaches the door closing position, limit block and another limit switch abut, control unit, with two component control connection, the device solves cylinder protection automatic door loose and easily damaged, switch door signal acquisition unsafe, inaccuracy and power -off operation maintenance difficult etc.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool technology, and more specifically, relates to an automatic protective door device for cylinders of a vertical machining center. Background Technology

[0002] Machining centers evolved from CNC milling machines. The biggest difference between them is that machining centers have the ability to automatically change machining tools. By installing tools for different purposes on the tool magazine, the machining tools on the spindle can be changed in one setup through an automatic tool changer, thus realizing multiple machining functions.

[0003] A vertical machining center is a machining center with a vertical spindle. Its structure typically features a fixed column and a rectangular worktable without indexing or rotation capabilities. It is suitable for machining disc, sleeve, and plate-like parts. It generally has three linear motion axes and can also mount a rotary table along a horizontal axis on the worktable for machining helical parts. Vertical machining centers are easy to clamp, operate, and observe the machining process. Program debugging is also easy, leading to their wide application.

[0004] With the development of new technologies and trends, the widespread application of industrial intelligence and automation, the development of robot technology and the reduction of robot usage costs, the automation level and application rate of vertical machining centers have been greatly improved. More and more vertical machining centers need to adapt their protective doors to various automation scenarios to meet the requirements of automatic workpiece replacement in unmanned production, forming flexible units or entire flexible production lines.

[0005] Currently, the structure of common cylinder-protected automatic doors in vertical machining centers has the following shortcomings:

[0006] 1. Automatic doors mostly use a cylinder and floating joint structure. With repeated reciprocating motion of the door, the floating joint connecting the cylinder rod and the door may become loose, which may cause the automatic door to malfunction or even deform the protective door.

[0007] 2. There are two common methods for collecting the opening and closing signals of cylinder automatic doors: one is to use the magnetic induction switch of the cylinder itself to indirectly collect the door opening and closing position signal through the position of the cylinder rod, which poses a safety hazard during the opening and closing process; the other is to use a contactless switch to directly sense the position signal, which can accurately collect the door opening and closing position signal, but the contactless switch is easily affected by the environment and may have false sensing.

[0008] 3. The cylinder automatic door control solenoid valve is a three-position five-way center-sealed solenoid valve. After the solenoid valve loses power, the automatic door cannot be manually opened or closed because the system is in a pressure-holding state, which is inconvenient for subsequent machine tool maintenance and manual operation under special circumstances. Utility Model Content

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a cylinder protection automatic door device for vertical machining centers. This device solves problems such as loose and easily damaged cylinder protection automatic doors, unsafe and inaccurate acquisition of door opening and closing signals, and difficulties in operation and maintenance during power outages. It improves the reliability and stability of cylinder protection automatic doors and can be applied to the front or side door protection automatic doors of vertical machining centers to better meet the application scenarios of automated production lines.

[0010] To achieve the above objectives, this utility model provides an automatic protective door device for cylinders in a vertical machining center, comprising:

[0011] The protective door is slidably installed at the opening of the protective compartment of the vertical machining center;

[0012] A cylinder transmission assembly is disposed above the protective door. The cylinder transmission assembly includes a three-position five-way central bleed solenoid valve and a telescopic cylinder. One end of the three-position five-way central bleed solenoid valve is provided with a silencer, and the other end of the three-position five-way central bleed solenoid valve is connected to the telescopic cylinder. The output end of the telescopic cylinder is connected to the protective door.

[0013] A limit switch assembly is disposed above the protective door. The limit switch assembly includes a pair of limit switches and a limit block. The positions of the limit switches correspond to the open and closed positions of the protective door, respectively. The limit block is disposed on the protective door. When the protective door reaches the open position, the limit block abuts against one of the limit switches. When the protective door reaches the closed position, the limit block abuts against the other limit switch.

[0014] The control unit is connected to the cylinder transmission assembly and the limit switch assembly.

[0015] Optionally, the other end of the three-position five-way leakage solenoid valve is provided with a straight connector, and the two ends of the telescopic cylinder are respectively provided with speed control valves, and the two speed control valves are connected to the straight connector through a Y-type connecting pipe.

[0016] Optionally, the cylinder transmission assembly further includes a box-shaped bracket and a U-shaped bracket. The box-shaped bracket is connected to the protective door, and the U-shaped bracket is connected to the output end of the telescopic cylinder. The box-shaped bracket includes a bottom wall and four side walls. The opening of the box-shaped bracket faces the telescopic cylinder. Each of the four side walls is provided with an elongated hole. The two sides of the U-shaped bracket are respectively provided with mounting holes, and the elongated holes are connected to the mounting holes.

[0017] Optionally, the bottom of the U-shaped bracket is connected to a double earring support, and a joint bearing is provided on the output end of the telescopic cylinder, the joint bearing extending into the interior of the double earring support.

[0018] Optionally, the two earpieces of the double earring support are respectively provided with a first pin hole, and the joint bearing is provided with a second pin hole. The positioning pin passes through the first pin hole and the second pin hole, and the positioning pin is located outside the first pin hole and is fixed by a buckle.

[0019] Optionally, the limit switch assembly further includes a wiring groove disposed above the opening in the protective compartment of the vertical machining center, and a pair of limit switches are spaced apart on the wiring groove.

[0020] Optionally, the limit switch includes a limit switch body and a guide lever, one end of the guide lever is rotatably connected to the limit switch body, and the other end of the guide lever abuts against the limit block.

[0021] Optionally, the limit switch body is provided with an angle sensor, the output end of the angle sensor is connected to the guide rocker arm, and the angle sensor is controlled by the control unit.

[0022] Optionally, the protective door is equipped with a door handle and an observation window.

[0023] Optionally, there are two protective doors, which are arranged in opposite directions, and the number of protective doors, cylinder transmission assembly and limit switch assembly are the same.

[0024] This utility model provides an automatic protective door device for cylinders in vertical machining centers, which has the following advantages:

[0025] 1. The automatic door device has a reasonable structural design, especially with the addition of telescopic cylinders and joint bearings, which can prevent the automatic door from loosening due to long-term use, prevent damage and deformation of the machine tool protective automatic door, reduce unnecessary waste, and lower production costs;

[0026] 2. This automatic door device is characterized by safety, stability, and long service life. The signal acquisition method of the mechanical limit switch is direct, simple, reliable, and durable. At the same time, it avoids erroneous signals caused by external environmental influences, ensuring smooth operation of the automatic door device, improving its practicality, and making it suitable for various automation application scenarios.

[0027] 3. This automatic door device is easy to install and disassemble, and will not cause any additional impact on the original structure of the machine tool. At the same time, it takes into account that in the event of a power failure, the gas inside the cylinder cavity can be discharged to the outside air through the three-position five-way solenoid valve to achieve depressurization. Operators and maintenance personnel can easily open and close the protective door manually to ensure normal maintenance work.

[0028] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0029] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0030] Figure 1 A schematic diagram of the structure of an automatic cylinder protection door device for a vertical machining center according to an embodiment of the present invention is shown.

[0031] Figure 2 A schematic diagram showing the connection between a telescopic cylinder and a box-shaped bracket according to an embodiment of the present invention is shown.

[0032] Figure 3 A schematic diagram showing the connection between the U-shaped bracket and the joint bearing according to an embodiment of the present invention is shown.

[0033] Figure 4 A schematic diagram showing the state in which the limit block and the limit switch abut against each other according to an embodiment of the present invention is shown.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Vertical machining center protective chamber; 2. Protective door; 3. Cylinder transmission assembly; 301. Three-position five-way central leakage solenoid valve; 302. Silencer; 303. Straight connector; 304. Air pipe; 305. Y-type connecting pipe; 306. Speed ​​control valve; 307. Telescopic cylinder; 308. L-shaped bracket; 309. Spherical bearing; 310. Double ear ring support; 311. Positioning pin; 312. Buckle; 313. U-shaped bracket; 314. Box-shaped bracket; 315. Side wall; 316. Oblong hole; 317. Mounting hole; 4. Limit switch assembly; 401. Limit switch; 402. Limit block; 403. Cable tray; 4011. Guide rocker arm; 4012. Limit switch body. Detailed Implementation

[0036] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0037] This utility model provides an automatic protective door device for cylinders in a vertical machining center, comprising:

[0038] The protective door is slidably installed at the opening of the protective compartment of the vertical machining center;

[0039] The cylinder transmission assembly is located above the protective door. The cylinder transmission assembly includes a three-position five-way central leakage solenoid valve and a telescopic cylinder. One end of the three-position five-way central leakage solenoid valve is equipped with a silencer, and the other end of the three-position five-way central leakage solenoid valve is connected to the telescopic cylinder. The output end of the telescopic cylinder is connected to the protective door.

[0040] A limit switch assembly is installed above the protective door. The limit switch assembly includes a pair of limit switches and a limit block. The positions of the limit switches correspond to the open and closed positions of the protective door, respectively. The limit block is installed on the protective door. When the protective door reaches the open position, the limit block abuts against one limit switch. When the protective door reaches the closed position, the limit block abuts against the other limit switch.

[0041] The control unit is connected to the cylinder drive assembly and the limit switch assembly.

[0042] Specifically, the automatic door device connects the pneumatic transmission assembly and limit switch assembly to the protective door. This allows the telescopic cylinder to drive the protective door to move horizontally. The telescopic cylinder receives its air supply through a three-position five-way central venting solenoid valve. When the machine tool experiences a normal or unexpected power outage, the silencer of the three-position five-way central venting solenoid valve releases the gas from the telescopic cylinder, switching it to a pressure-free state, allowing the protective door to be opened and closed manually. A limit block is also installed at the top of the protective door, which, driven by the telescopic cylinder, moves the protective door between the open and closed positions. When the limit block contacts the limit switch at the closed position, the limit switch assembly determines that the protective door is in the closed state. When the limit block contacts the limit switch at the open position, the limit switch assembly determines that the protective door is in the open state. In this way, the opening and closing state of the protective door does not need to be confirmed by the sensor switch and is not affected by the surrounding environment. The control unit in this automatic door device uses the cylinder drive assembly and the limit switch assembly in conjunction. When the limit switch assembly confirms that the protective door has moved to the correct position, the cylinder drive assembly no longer drives the protective door, ensuring that the protective door moves accurately to the correct position.

[0043] Optionally, the other end of the three-position five-way leakage solenoid valve is provided with a straight-through connector, and the two ends of the telescopic cylinder are respectively provided with speed control valves, and the two speed control valves are connected to the straight-through connector through a Y-type connecting pipe.

[0044] Optionally, the protective door is equipped with a door handle and an observation window.

[0045] Specifically, a three-position five-way central leakage solenoid valve is bolted and installed above the opening of the protective chamber. A silencer is threaded onto one end of the solenoid valve, and a straight connector is installed on the other end. A Y-connector is bolted to the protective chamber, and air pipes are connected to the straight connector and the Y-connector respectively. To control the opening and closing speed of the protective door, two speed control valves are installed on the telescopic cylinder. The power air source enters from the three-position five-way central leakage solenoid valve and then branches through the Y-connector. The two speed control valves respectively regulate and control the opening and closing speeds. When performing the opening and closing actions, the flow rate of exhaust or supply air is limited by the adjusting element of the speed control valve, thereby controlling the speed of the telescopic cylinder's advance and return, and thus achieving the required opening and closing speed control.

[0046] Optionally, the cylinder transmission assembly also includes a box-shaped bracket and a U-shaped bracket. The box-shaped bracket is connected to the protective door, and the U-shaped bracket is connected to the output end of the telescopic cylinder. The box-shaped bracket includes a bottom wall and four side walls. The opening of the box-shaped bracket faces the telescopic cylinder. Each of the four side walls is provided with an elongated hole. The two sides of the U-shaped bracket are provided with mounting holes, and the elongated holes are connected to the mounting holes.

[0047] Specifically, in the cylinder transmission assembly, in addition to the telescopic cylinder as the power source, a box-shaped bracket is installed on the protective door, and a U-shaped bracket is connected to the output end of the telescopic cylinder. The box-shaped bracket has elongated holes on its four side walls, and the U-shaped bracket has mounting holes for positioning. When the box-shaped bracket and the U-shaped bracket are connected and fixed, the elongated holes on the four side walls facilitate fine-tuning of the connection position of the U-shaped bracket. This is equivalent to replacing the floating joint structure, which greatly reduces the probability of loosening of the connecting components, avoids affecting the smoothness of opening and closing the door, and prevents damage to the protective door.

[0048] Optionally, the bottom of the U-shaped bracket is connected to a double earring support, and a joint bearing is provided on the output end of the telescopic cylinder, with the joint bearing extending into the interior of the double earring support.

[0049] Optionally, the two earpieces of the double earpiece support are provided with a first pin hole, and the joint bearing is provided with a second pin hole. The positioning pin passes through the first pin hole and the second pin hole, and the positioning pin is located outside the first pin hole and is fixed by a buckle.

[0050] Specifically, one side of the U-shaped bracket is connected to the box-shaped bracket on the protective door, and the other side of the U-shaped bracket is connected to the output end of the telescopic cylinder through a double-eared bracket. The base of the double-eared bracket is fitted to the bottom of the U-shaped bracket to increase the connection area between the two components. A joint bearing of the telescopic cylinder output end is inserted between the two ear parts of the double-eared bracket. The ear parts are aligned with the pins on the joint bearing and are connected and fixed by positioning pins and buckles to ensure that the telescopic cylinder drives the protective door to move into place.

[0051] Optionally, the limit switch assembly also includes a wiring trough located above the opening of the protective chamber of the vertical machining center, with a pair of limit switches spaced apart on the wiring trough.

[0052] Optionally, the limit switch includes a limit switch body and a guide lever, one end of which is rotatably connected to the limit switch body, and the other end of which abuts against the limit block.

[0053] Specifically, the limit block is a sheet metal part with angle and height differences, bolted to the protective door and moving synchronously with the opening and closing of the machine tool's protective door. The cable tray is fixed to the machine tool's protective compartment, and the limit switch body is mounted on the cable tray. Each telescopic cylinder is equipped with at least two limit switches. The limit switches are normally stationary, and their cables are connected to the machine tool through the cable tray for signal transmission. The limit block moves with the protective door. When the limit block contacts the limit switch in the middle of the opening, it indicates the protective door is closed; when it contacts the limit switch at the edge of the opening, it indicates the protective door is open.

[0054] Optionally, the limit switch body is equipped with an angle sensor, the output end of which is connected to the guide rod, and the angle sensor is connected to the control unit.

[0055] Specifically, the limit switch includes a fixed limit switch body and a movable guide rod. When the limit block begins to contact the guide rod, the control unit controls the output end of the telescopic cylinder to slow down. When the angle sensor detects that the rotation angle of the guide rod has reached the set value, the control unit controls the output end of the telescopic cylinder to stop moving, so that the protective door stops moving.

[0056] Optionally, there are two protective doors, which are arranged in opposite directions. The number of protective doors, cylinder transmission components, and limit switch components are the same.

[0057] Specifically, the protective door is designed according to the opening size of the protective components of the vertical machining center. It can be set as two double doors. In this way, the cylinder transmission assembly and the limit switch assembly are designed as two separate components. The movement of the protective door is controlled by the various functional components.

[0058] Example

[0059] like Figures 1 to 4 As shown, this utility model provides an automatic protective door device for cylinders in a vertical machining center, comprising:

[0060] Two protective doors 2 are slidably installed at the opening of the protective compartment 1 of the vertical machining center, and the two protective doors 2 are arranged to open opposite each other;

[0061] The cylinder transmission assembly 3 is respectively installed above the protective door 2. The cylinder transmission assembly 3 includes a three-position five-way central leakage solenoid valve 301, a muffler 302 and a telescopic cylinder 307. One end of the three-position five-way central leakage solenoid valve 301 is connected to the muffler 302, and the other end of the three-position five-way central leakage solenoid valve 301 is connected to the telescopic cylinder 307. The output end of the telescopic cylinder 307 is connected to the protective door 2.

[0062] Limit switch assembly 4 is respectively disposed above the protective door 2. Limit switch assembly 4 includes a pair of limit switches 401 and limit blocks 402. The positions of the limit switches 401 correspond to the open position and the closed position of the protective door 2 respectively. The limit blocks 402 are disposed on the protective door 2. When the protective door 2 reaches the open position, the limit blocks 402 abut against the limit switches 401 located at both ends. When the protective door 2 reaches the closed position, the limit blocks 402 abut against the limit switch 401 located in the middle.

[0063] The control unit is connected to the cylinder transmission assembly 3 and the limit switch assembly 4.

[0064] In this embodiment, a straight connector 303 is provided at the other end of the three-position five-way central leakage solenoid valve 301, and speed control valves 306 are respectively provided at both ends of the telescopic cylinder 307. The two speed control valves 306 are connected to the straight connector 303 through a Y-type connecting pipe 305.

[0065] In this embodiment, the cylinder transmission assembly 3 further includes a box-shaped bracket 314 and a U-shaped bracket 313. The box-shaped bracket 314 is connected to the protective door 2, and the U-shaped bracket 313 is connected to the output end of the telescopic cylinder 307. The box-shaped bracket 314 includes a bottom wall and four side walls. The opening of the box-shaped bracket 314 is set towards the telescopic cylinder 307. The four side walls 315 are respectively provided with elongated holes 316. The two sides of the U-shaped bracket 313 are respectively provided with mounting holes 317, and the elongated holes 316 are correspondingly connected to the mounting holes 317.

[0066] In this embodiment, a double earring support 310 is connected to the bottom of the U-shaped bracket 313, and a joint bearing 309 is provided on the output end of the telescopic cylinder 307, which extends into the interior of the double earring support 310.

[0067] In this embodiment, the two ear parts of the double ear ring support 310 are respectively provided with first pin holes, and the joint bearing 309 is provided with second pin holes. The positioning pin 311 passes through the first pin hole and the second pin hole, and the positioning pin 311 is located outside the first pin hole and is fixed by buckles 312.

[0068] In this embodiment, the limit switch assembly 4 also includes a wiring trough 403 disposed above the opening of the protective chamber 1 of the vertical machining center. The wiring trough 403 is disposed in a one-to-one correspondence with the protective door 2, and a pair of limit switches 401 are disposed at intervals on the wiring trough 403.

[0069] In this embodiment, the limit switch 401 includes a limit switch body 4012 and a guide rocker arm 4011. One end of the guide rocker arm 4011 is rotatably connected to the limit switch body 4012, and the other end of the guide rocker arm 4011 abuts against the limit block 402.

[0070] In this embodiment, a rotation angle sensor is provided in the limit switch body 4012. The output end of the rotation angle sensor is connected to the guide rocker arm 4011, and the rotation angle sensor is connected to the control unit.

[0071] In this embodiment, the protective door 2 is equipped with a door handle and an observation window.

[0072] In summary, the protective enclosure 1 of the vertical machining center is located outside the working area of ​​the machine tool. The protective enclosure 1 is generally made of carbon structural steel, and after powder coating, it is connected to the bed and column of the vertical machining center by bolts. It effectively blocks and recycles cutting fluid and waste chips during the machining process, preventing environmental pollution and impact, and protecting the safety of machine tool operators and the surrounding environment. A protective door 2 is located at the front of the protective enclosure 1, with one on each side. Each protective door 2 has a door frame and handle, and a glass observation window in the middle. During machining operations, the protective doors 2 on both sides slide and close completely via circular guide rails and sliders, isolating the internal machining space of the vertical machining center from the external environment. After machining operations are completed, the protective doors 2 slide and open to their maximum opening width, allowing automated equipment such as robotic arms to remove the machined parts, completing the automated machining process.

[0073] In this automatic cylinder door device, the cylinder drive assembly 3 is bolted to the protective chamber 1 and the protective door 2 of the vertical machining center. The limit switch assembly 4 is bolted to the protective chamber 1 of the vertical machining center. After receiving the door opening signal, the cylinder drive assembly 3 executes the door opening action. The cylinder drive assembly 3 and the protective door 2 move synchronously outward from the machine tool. When the protective door 2 is opening, the limit switch assembly 4 collects the door opening completion signal, and the cylinder drive assembly 3 stops the door opening action. At this time, the protective door 2 is opened to the maximum opening width of the machine tool, completing the door opening action. Operators or automated equipment can then perform actions such as loading and unloading materials on the machine tool, completing the pre-processing preparation. After receiving the door closing signal, the cylinder drive assembly 3 executes the door closing action. The cylinder drive assembly 3 and the protective door 2 move synchronously inward from the machine tool. When the protective door 2 is closing, the limit switch assembly 4 collects the door closing completion signal, and the cylinder drive assembly 3 stops the door closing action. At this time, the protective door 2 is completely closed, completing the door closing action, and the machine tool can proceed to the next step of parts processing and cutting work. Through the above steps, the cylinder automatic door achieves stable and safe long-term operation, improves production efficiency, and reduces maintenance costs. At the same time, the limit switch signal acquisition is accurate, requiring no complicated debugging, and the response speed is fast. It avoids the generation of erroneous signals due to external environmental factors affecting the contactless switch, and also reduces the difficulty of assembly and maintenance work, with low learning costs, thus lowering the stringent industry entry requirements.

[0074] To prevent gas from blocking the protective door 2 after a normal or unexpected power outage, this invention employs a three-position five-way central venting solenoid valve 301. The input medium is filtered and depressurized gas from a gas source, which controls the reciprocating motion of the telescopic cylinder 307. After a normal or unexpected power outage, the gas in the telescopic cylinder 307 can be depressurized to the air through the silencer 302 connected to the middle position of the three-position five-way central venting solenoid valve 301, thus achieving a pressure-free state. Operators and maintenance personnel can manually perform normal opening and closing actions and any state of the protective door 2.

[0075] Limit switch 401 is a rolling rocker arm type limit switch, with one installed at each of the open and closed positions, mounted on the wiring trough 403. Limit block 402 is fixed to the protective door 2. When the machine tool issues an open command, the cylinder transmission assembly 3 begins the open action. Limit block 402 moves with the protective door 2. When it reaches the maximum open width, limit block 402 contacts the guide rocker arm 4011 of the limit switch. When the guide rocker arm 4011 swings to the set angle and position, it triggers the open-to-close signal, completing the open action. Similarly, when the machine tool issues a close command, limit block 402 moves with the protective door 2. When it reaches the closed position, limit block 402 contacts the guide rocker arm 4011 of the limit switch on the other side of the wiring trough 403. When the guide rocker arm 4011 swings to the set angle and position, it triggers the close-to-close signal, completing the close action. Mechanical limit switches directly detect the opening and closing signals of the protective door. The signal acquisition method is direct, simple, reliable, and durable, ensuring the safety and accuracy of the acquired signals while avoiding erroneous signals caused by external environmental influences.

[0076] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An automatic protective door device for cylinders in a vertical machining center, characterized in that, include: The protective door is slidably installed at the opening of the protective compartment of the vertical machining center; A cylinder transmission assembly is disposed above the protective door. The cylinder transmission assembly includes a three-position five-way central bleed solenoid valve and a telescopic cylinder. One end of the three-position five-way central bleed solenoid valve is provided with a silencer, and the other end of the three-position five-way central bleed solenoid valve is connected to the telescopic cylinder. The output end of the telescopic cylinder is connected to the protective door. A limit switch assembly is disposed above the protective door. The limit switch assembly includes a pair of limit switches and a limit block. The positions of the limit switches correspond to the open and closed positions of the protective door, respectively. The limit block is disposed on the protective door. When the protective door reaches the open position, the limit block abuts against one of the limit switches. When the protective door reaches the closed position, the limit block abuts against the other limit switch. The control unit is connected to the cylinder transmission assembly and the limit switch assembly.

2. The automatic protective door device for cylinders of a vertical machining center according to claim 1, characterized in that, The other end of the three-position five-way leakage solenoid valve is provided with a straight connector, and the two ends of the telescopic cylinder are respectively provided with speed control valves. The two speed control valves are connected to the straight connector through a Y-type connecting pipe.

3. The automatic protective door device for cylinders of a vertical machining center according to claim 2, characterized in that, The cylinder transmission assembly also includes a box-shaped bracket and a U-shaped bracket. The box-shaped bracket is connected to the protective door, and the U-shaped bracket is connected to the output end of the telescopic cylinder. The box-shaped bracket includes a bottom wall and four side walls. The opening of the box-shaped bracket faces the telescopic cylinder. Each of the four side walls is provided with an elongated hole. The two sides of the U-shaped bracket are provided with mounting holes, and the elongated holes are connected to the mounting holes.

4. The automatic protective door device for cylinders of a vertical machining center according to claim 3, characterized in that, The bottom of the U-shaped bracket is connected to a double earring support, and a joint bearing is provided on the output end of the telescopic cylinder, the joint bearing extending into the interior of the double earring support.

5. The automatic protective door device for cylinders of a vertical machining center according to claim 4, characterized in that, The two earpieces of the double earring support are respectively provided with a first pin hole, and the joint bearing is provided with a second pin hole. The positioning pin passes through the first pin hole and the second pin hole, and the positioning pin is located outside the first pin hole and is fixed by a buckle.

6. The automatic protective door device for cylinders of a vertical machining center according to claim 1, characterized in that, The limit switch assembly also includes a wiring groove disposed above the opening in the protective chamber of the vertical machining center, and a pair of limit switches are spaced apart on the wiring groove.

7. The automatic protective door device for cylinders of a vertical machining center according to claim 6, characterized in that, The limit switch includes a limit switch body and a guide rocker arm. One end of the guide rocker arm is rotatably connected to the limit switch body, and the other end of the guide rocker arm abuts against the limit block.

8. The automatic protective door device for cylinders of a vertical machining center according to claim 7, characterized in that, The limit switch body is equipped with an angle sensor, the output end of which is connected to the guide rocker arm, and the angle sensor is controlled by the control unit.

9. The automatic protective door device for cylinders of a vertical machining center according to claim 1, characterized in that, The protective door is equipped with a door handle and an observation window.

10. The automatic protective door device for cylinders of a vertical machining center according to claim 1, characterized in that, There are two protective doors, which are arranged to open opposite each other. The number of protective doors, cylinder transmission components and limit switch components are the same.

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