Cylinder protection automatic door device of vertical machining center

Abstract

The invention discloses an automatic protective door device for a cylinder of a vertical machining center, which relates to the technical field of machine tools and comprises a protective door arranged at an opening of a protective room in a sliding manner; the air cylinder transmission assembly is arranged above the protective door and comprises a three-position five-way middle-discharging electromagnetic valve and a telescopic air cylinder, an exhaust hole is formed in one end of the three-position five-way middle-discharging electromagnetic valve, the other end of the three-position five-way middle-discharging electromagnetic valve is connected with the telescopic air cylinder, and the output end of the telescopic air cylinder is connected with the protective door; the limiting switch assembly is arranged above the protective door and comprises a pair of limiting switches and a limiting block, the limiting block is arranged on the protective door, when the protective door reaches the door opening position, the limiting block abuts against one limiting switch, and when the protective door reaches the door closing position, the limiting block abuts against the other limiting switch; the control unit is in control connection with the two assemblies; the device solves the problems that the cylinder protection automatic door is loosened and easy to damage, the door opening and closing signal acquisition is unsafe and inaccurate, and the power-off operation and maintenance are difficult.

Description

Technical Field

[0001] The invention belongs to the technical field of machine tools, and more specifically, relates to an automatic door device for protecting a cylinder of a vertical machining center. Background Art

[0002] The machining center has developed from the CNC milling machine. The biggest difference between the machining center and the CNC milling machine is that the machining center has the ability to automatically exchange machining tools. By installing tools for different purposes on the tool magazine, the machining tools on the spindle can be changed through the automatic tool changing device in one clamping to achieve multiple machining functions.

[0003] A vertical machining center is a machining center with a vertical spindle. Its structure is mostly fixed columns, and the worktable is rectangular. It has no indexing and rotation function. It is suitable for machining disks, sleeves, and plate parts. It generally has three linear motion coordinate axes, and a rotary table that rotates along the horizontal axis can be installed on the worktable to process spiral parts. Vertical machining centers are easy to install, easy to operate, easy to observe the machining situation, easy to debug programs, and widely used.

[0004] Nowadays, with the development of new technologies and new trends, the widespread application of industrial intelligence and automation, the development of robotics technology and the reduction in the cost of using robots, the automation level of vertical machining center machines and the popularity of automated application scenarios have been greatly improved. More and more vertical machining center machine tools' protective doors also need to adapt to various automation scenarios to meet the needs of automatic replacement of workpieces in unmanned production, forming flexible units or entire flexible production lines.

[0005] At present, the structure of the common cylinder protection automatic door in the vertical machining center has the following shortcomings:

[0006] 1. Most automatic doors are cylinder and floating joint structures. With the reciprocating movement of the door, there is a risk of loosening of the floating joint connecting the cylinder rod and the door, which may cause the automatic door to fail to work properly or even deform the protective door.

[0007] 2. There are two common ways to collect the door opening and closing signals of cylinder automatic doors: one is to use the cylinder's own magnetic induction switch to indirectly collect the door opening and closing signals through the cylinder rod position, which poses a safety hazard in the process of opening and closing the door; the other is to use a contactless switch to directly sense the door opening and closing signals, which can accurately collect the door opening and closing signals, but the contactless switch is easily affected by the environment and may cause false induction;

[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-maintaining state, which is inconvenient for subsequent machine tool-related maintenance work and manual operation under special circumstances. Summary of the invention

[0009] The purpose of the present invention is to address the deficiencies in the prior art and to provide a cylinder-protected automatic door device for a vertical machining center, which solves the problems of loose and easy damage of the cylinder-protected automatic door, unsafe and inaccurate door opening and closing signal collection, and difficult power-off operation and maintenance, thereby improving the reliability and stability of the cylinder-protected automatic door. The device can be applied to the front door or side door protection automatic door of a vertical machining center to better meet the application scenarios of automated production lines.

[0010] In order to achieve the above object, the present invention provides a vertical machining center cylinder protection automatic door device, comprising:

[0011] A protective door is slidably arranged at the opening of the protective room of the vertical machining center;

[0012] A cylinder transmission assembly is arranged above the protective door, the cylinder transmission assembly comprises a three-position five-way center-drain solenoid valve and a telescopic cylinder, one end of the three-position five-way center-drain solenoid valve is provided with an exhaust hole, the other end of the three-position five-way center-drain solenoid valve is connected to the telescopic cylinder, and the output end of the telescopic cylinder is connected to the protective door;

[0013] A limit switch assembly is arranged above the protective door, the limit switch assembly comprises a pair of limit switches and a limit block, the limit switches are arranged at positions corresponding to the door opening position and the door closing position of the protective door respectively, the limit block is arranged on the protective door, when the protective door reaches the door opening position, the limit block abuts against one of the limit switches, and when the protective door reaches the door closing position, the limit block abuts against the other limit switch;

[0014] A control unit is control-connected with the cylinder transmission assembly and the limit switch assembly.

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

[0016] 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, 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 is set toward the telescopic cylinder, the four side walls are respectively provided with oblong holes, and the two sides of the U-shaped bracket are respectively provided with mounting holes, and the oblong holes are correspondingly connected to the mounting holes.

[0017] Optionally, a double clevis support is connected to the bottom of the U-shaped bracket, and a spherical bearing is arranged on the output end of the telescopic cylinder, and the spherical bearing extends to the interior of the double clevis support.

[0018] Optionally, the two supporting ears of the double earring support are respectively provided with a first pin hole, 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 on the outer side of the first pin hole and is fixed by a snap buckle.

[0019] Optionally, the limit switch assembly further comprises a wiring groove arranged in the vertical machining center protection room above the opening, and a pair of the limit switches are arranged at intervals on the wiring groove.

[0020] Optionally, 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.

[0021] Optionally, a rotation angle sensor is provided in the limit switch body, an output end of the rotation angle sensor is connected to the guide rocker, and the rotation angle sensor is control-connected to the control unit.

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

[0023] Optionally, two protective doors are provided, the two protective doors are arranged to open opposite each other, and the number of the protective doors, the cylinder transmission assembly and the limit switch assembly is the same.

[0024] The present invention provides a vertical machining center cylinder protection automatic door device, which has the following beneficial effects:

[0025] 1. The automatic door device has a reasonable structural design, especially 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 protection automatic door, reduce unnecessary waste, and reduce production costs;

[0026] 2. The automatic door device is safe, stable and has a long service life. The signal acquisition method of the mechanical limit switch is direct, simple, reliable and durable. At the same time, it avoids the erroneous signals caused by the external environment, ensures the smooth operation of the automatic door device, improves practicality, and is suitable for various automation application scenarios;

[0027] 3. The automatic door device is easy to install and disassemble, and will not cause additional impact on the original structure of the machine tool. At the same time, considering the power failure, the gas inside the cylinder cavity can be discharged to the outside air through the three-position five-way center drain solenoid valve to achieve pressure relief. The operator and maintenance personnel can easily open and close the protective door manually to ensure normal maintenance work.

[0028] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0030] Figure 1 A schematic structural diagram of a cylinder protection automatic 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 of the connection between a U-shaped bracket and a spherical bearing according to an embodiment of the present invention is shown.

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

[0034] Description of reference numerals:

[0035] 1. Protection room for vertical machining center; 2. Protection door; 3. Cylinder transmission assembly; 301. Three-position five-way center drain solenoid valve; 302. Muffler; 303. Straight joint; 304. Air pipe; 305. Y-type pipe; 306. Speed ​​control valve; 307. Telescopic cylinder; 308. L-type bracket; 309. Spherical bearing; 310. Double earring support; 311. Locating pin; 312. Buckle; 313. U-type 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. Wiring trough; 4011. Guide swing arm; 4012. Limit switch body. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention will be described in more detail below. Although the 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 by the embodiments set forth herein. On the contrary, 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] The present invention provides a vertical machining center cylinder protection automatic door device, comprising:

[0038] A protective door is slidably arranged at the opening of the protective room of the vertical machining center;

[0039] The cylinder transmission assembly is arranged above the protective door, and the cylinder transmission assembly includes a three-position five-way center-drain solenoid valve and a telescopic cylinder. One end of the three-position five-way center-drain solenoid valve is provided with an exhaust hole, and the other end of the three-position five-way center-drain solenoid valve is connected to the telescopic cylinder, and the output end of the telescopic cylinder is connected to the protective door;

[0040] A limit switch assembly is arranged 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 door opening position and the door closing position of the protective door, respectively. The limit block is arranged on the protective door. When the protective door reaches the door opening position, the limit block abuts against one limit switch. When the protective door reaches the door closing position, the limit block abuts against the other limit switch.

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

[0042] Specifically, in the automatic door device, the pneumatic transmission assembly and the limit switch assembly are connected to the protective door, so that the telescopic cylinder can drive the protective door to move horizontally. The telescopic cylinder provides the air source through the three-position five-way center-drain solenoid valve. When the machine tool is powered off normally or accidentally, it is necessary to discharge the gas in the telescopic cylinder through the exhaust hole of the three-position five-way center-drain solenoid valve. In this way, the telescopic cylinder is switched to a pressure-free state, and the protective door can be opened and closed manually. A limit block is also provided on the top of the protective door, which is driven by the telescopic cylinder to move the protective door between the open and closed positions. When When the limit block contacts the limit switch at the closing position, the limit switch assembly can obtain the protective door in the closed state. When the limit block contacts the limit switch at the opening position, the limit switch assembly can obtain the protective door in the open state. In this way, the opening and closing state of the protective door does not need to be confirmed by the induction switch and is not affected by the surrounding environment. The control unit in the automatic door device uses the cylinder drive assembly and the limit switch assembly in combination. When the limit switch assembly confirms that the protective door has moved into place, the cylinder drive assembly will no longer drive the protective door to ensure that the protective door moves accurately into place.

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

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

[0045] Specifically, a three-position five-way center-drain solenoid valve is fixedly installed above the opening of the protection room by bolts, a muffler is threadedly connected to one end of the solenoid valve, a straight-through joint is installed on the other end of the solenoid valve, a Y-type pipe is fixed to the protection room by bolts, and the air pipes are respectively connected to the straight-through joint and the Y-type pipe; in order to control the opening and closing speed of the protection door, two speed control valves are installed on the telescopic cylinder, and the power air source enters from the three-position five-way center-drain solenoid valve and then branches out through the Y-type pipe. The two speed control valves respectively adjust and control the opening and closing speeds of the door. When performing the opening and closing actions, the exhaust or air supply flow is limited by setting the regulating element of the speed control valve to achieve the propulsion and return speed of the telescopic cylinder, thereby 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, 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 is set toward the telescopic cylinder, and oblong holes are respectively provided on the four side walls. Mounting holes are respectively provided on two sides of the U-shaped bracket, and the oblong holes are correspondingly connected to the mounting holes.

[0047] Specifically, in addition to the telescopic cylinder as a power source in the cylinder transmission assembly, a box-shaped bracket is arranged on the protective door, and a U-shaped bracket is connected to the output end of the telescopic cylinder. Long circular holes are respectively arranged on the four side walls of the box-shaped bracket, and a mounting hole for positioning is arranged on the U-shaped bracket. When the box-shaped bracket and the U-shaped bracket are connected and fixed, the long circular holes on the four side walls facilitate fine-tuning of the connection position of the U-shaped bracket, which is equivalent to replacing the floating joint structure, greatly reducing the probability of loosening of the connecting elements, avoiding affecting the smoothness of opening and closing the door, and avoiding damage to the protective door.

[0048] Optionally, a double earring support is connected to the bottom of the U-shaped bracket, and a spherical bearing is arranged on the output end of the telescopic cylinder, and the spherical bearing extends to the inside of the double earring support.

[0049] Optionally, the two supporting ears of the double earring support are respectively provided with a first pin hole, 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 on the outside of the first pin hole and is fixed by a snap 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 earring support. The base part of the double earring support is fitted and connected to the bottom surface part of the U-shaped bracket to increase the connection area of ​​the two parts. A joint bearing of the output end of the telescopic cylinder is inserted between the two ear parts of the double earring support. The ear part is aligned with the pin on the joint bearing, and is connected and fixed by a locating pin and a buckle 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 arranged above the opening of the protection room of the vertical machining center, and a pair of limit switches are arranged at intervals on the wiring trough.

[0052] Optionally, 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.

[0053] Specifically, the limit block is a sheet metal part with an angle and height difference, which is installed on the protective door by bolts and moves synchronously with the switch of the machine tool protective door; the wiring trough is fixed on the machine tool protection room, and the limit switch body is installed on the wiring trough. A telescopic cylinder is equipped with at least two limit switches. The limit switch is normally fixed, and the cable line of the limit switch is connected to the machine tool through the wiring trough to realize 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 can be determined that the protective door is in the closed state. When the limit block contacts the limit switch at the edge of the opening, it can be determined that the protective door is in the open state.

[0054] Optionally, a rotation angle sensor is provided in the limit switch body, an output end of the rotation angle sensor is connected to the guide swing arm, and the rotation angle sensor is control-connected to the control unit.

[0055] Specifically, the limit switch includes a limit switch body as a fixed part and a guide rocker arm as a movable part. When the limit block begins to contact the guide rocker arm, the control unit controls the output end of the telescopic cylinder to slow down its movement speed. When the angle sensor recognizes that the rotation angle of the guide rocker arm reaches the set value, the control unit controls the output end of the telescopic cylinder to stop moving, thereby stopping the protective door from moving.

[0056] Optionally, two protective doors are provided, the two protective doors are arranged to open opposite each other, and the number of protective doors, cylinder transmission assemblies and limit switch assemblies provided is the same.

[0057] Specifically, the protective door is designed according to the opening size of the protective part of the vertical machining center, and can be set as two double-door forms. In this way, the cylinder transmission component and the limit switch component are designed as two, and the movement of the protective door into place is controlled by components with various functions.

[0058] Example

[0059] like Figures 1 to 4 As shown, the present invention provides a vertical machining center cylinder protection automatic door device, comprising:

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

[0061] The cylinder transmission components 3 are respectively arranged above the protective door 2. The cylinder transmission components 3 include a three-position five-way center-drain solenoid valve 301, a muffler 302 and a telescopic cylinder 307. One end of the three-position five-way center-drain solenoid valve 301 is connected to the muffler 302, and the other end of the three-position five-way center-drain 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] The limit switch assembly 4 is respectively arranged above the protective door 2. The limit switch assembly 4 includes a pair of limit switches 401 and a limit block 402. The positions of the limit switches 401 correspond to the door opening position and the door closing position of the protective door 2 respectively. The limit block 402 is arranged on the protective door 2. When the protective door 2 reaches the door opening position, the limit block 402 abuts against the limit switches 401 at both ends. When the protective door 2 reaches the door closing position, the limit block 402 abuts against the limit switch 401 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-through joint 303 is provided at the other end of the three-position five-way center-drain 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-through joint 303 through a Y-type pipe 305.

[0065] In this embodiment, the cylinder transmission assembly 3 also 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 toward the telescopic cylinder 307. The four side walls 315 are respectively provided with oblong holes 316. The two sides of the U-shaped bracket 313 are respectively provided with mounting holes 317, and the oblong holes 316 are correspondingly connected to the mounting holes 317.

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

[0067] In this embodiment, the two supporting ears of the double earring support 310 are respectively provided with a first pin hole, and the joint bearing 309 is provided with a second pin hole. The positioning pin 311 passes through the first pin hole and the second pin hole. The positioning pin 311 is located on the outside of the first pin hole and is fixed by a buckle 312.

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

[0069] In this embodiment, the limit switch 401 includes a limit switch body 4012 and a guide rocker 4011 , one end of the guide rocker 4011 is rotatably connected to the limit switch body 4012 , and the other end of the guide rocker 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 4011 , and the rotation angle sensor is control-connected to the control unit.

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

[0072] In summary, the protection room 1 of the vertical machining center is set outside the working area of ​​the machine tool. The protection room 1 of the vertical machining center is generally made of carbon structural steel. The shell is sprayed and connected to the bed and column of the vertical machining center by bolts, which can effectively block and recycle the cutting fluid and waste chips in the machine tool processing process to avoid environmental pollution and impact, and is used to protect the safety of machine tool operators and the surrounding environment; a protection door 2 is arranged directly in front of the protection room 1 of the vertical machining center, one on each side, and the protection door 2 is provided with a door frame and a door handle, and a glass observation window is opened in the middle. When the vertical machining center is performing machining and cutting work, the protection doors 2 on the left and right sides are translated and completely closed through circular guide rails and sliders to isolate the internal machining space of the vertical machining center from the external environment. After the machining and cutting work of the vertical machining center is completed, the protection door 2 is translated and opened to the maximum door opening width, and the processed parts can be taken out by automated equipment such as manipulators to complete the automated processing.

[0073] In the cylinder automatic door device, the cylinder drive assembly 3 is fixedly installed on the protection room 1 and the protection door 2 of the vertical machining center by bolts, and the limit switch assembly 4 is fixedly installed on the protection room 1 of the vertical machining center by bolts. After the cylinder drive assembly 3 receives the door opening signal, the cylinder drive assembly 3 performs the door opening action, and the cylinder drive assembly 3 and the protection door 2 synchronously perform translational movement to the outside of the machine tool. When the limit switch assembly 4 collects the door opening position signal during the opening process of the protection door 2, the cylinder drive assembly 3 stops the door opening action. At this time, the protection door 2 opens to the maximum door opening width of the machine tool, and the door opening action is completed. The operator or the automation equipment can perform actions such as loading and unloading the machine tool to complete the pre-processing preparation. The cylinder drive assembly 3 receives the door closing signal, and the cylinder drive assembly 3 performs the door closing action. The cylinder drive assembly 3 and the protection door 2 synchronously perform translational movement to the inside of the machine tool. When the limit switch assembly 4 collects the door closing position signal during the closing process of the protection door 2, the cylinder drive assembly 3 stops the door closing action. At this time, the protection door 2 is completely closed, and the door closing action is completed. The machine tool can perform the next step of part processing and cutting. Through the above steps, the stable, safe and long-term operation of the cylinder automatic door is achieved, the production efficiency is improved, and the maintenance cost is reduced. At the same time, the limit switch signal is accurately collected, no complicated debugging is required, and the response speed is fast, which avoids the non-electric contact switch from being affected by external environmental factors to generate erroneous signals. It also reduces the difficulty of assembly and maintenance work, low learning costs, and reduces the strict industry entry conditions.

[0074] In order to prevent the protective door 2 from being unable to reset to the normal opening and closing states due to the gas being blocked in the telescopic cylinder 307 after a normal or accidental power failure on the machine tool, the present invention adopts a three-position five-way center-drain solenoid valve 301, and the input medium is the gas from the air source that has been filtered and decompressed, to control the reciprocating motion of the telescopic cylinder 307. After a normal or accidental power failure on the machine tool, the gas in the telescopic cylinder 307 can be decompressed into the air through the muffler 302 connected in the middle position of the three-position five-way center-drain solenoid valve 301, thereby achieving a pressure-free state, and the operating and maintenance personnel can manually perform the normal opening and closing actions and any state of the protective door 2.

[0075] The limit switch 401 is a rolling rocker type limit switch, one is set at each of the door opening and door closing positions, and is installed on the wiring groove 403, while the limit block 402 is fixed on the protective door 2. When the machine tool issues a door opening command, the cylinder transmission assembly 3 starts to perform the door opening action, and the limit block 402 moves horizontally with the protective door 2. When it is opened to the maximum door opening width position, the limit block 402 contacts the guide rocker 4011 of the limit switch. When the guide rocker 4011 swings to the set angle and position, the door opening signal is triggered to complete the door opening action. Similarly, when the machine tool issues a door closing command, the limit block 402 moves horizontally with the protective door 2. When it reaches the door closing position, the limit block 402 contacts the guide rocker 4011 of the limit switch on the other side of the wiring groove 403. When the guide rocker 4011 swings to the set angle and position, the door closing signal is triggered to complete the door closing action. The mechanical limit switch directly detects the open and closed signals of the protective door. The signal acquisition method is direct, simple, reliable and durable, ensuring the safety and accuracy of the collected signals while avoiding erroneous signals caused by external environmental influences.

[0076] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A vertical machining center cylinder protection automatic door device, characterized in that: include: A protective door is slidably arranged at the opening of the protective room of the vertical machining center; A cylinder transmission assembly is arranged above the protective door, the cylinder transmission assembly comprises a three-position five-way center-drain solenoid valve and a telescopic cylinder, one end of the three-position five-way center-drain solenoid valve is provided with an exhaust hole, the other end of the three-position five-way center-drain solenoid valve is connected to the telescopic cylinder, and the output end of the telescopic cylinder is connected to the protective door; A limit switch assembly is arranged above the protective door, the limit switch assembly comprises a pair of limit switches and a limit block, the limit switches are arranged at positions corresponding to the door opening position and the door closing position of the protective door respectively, the limit block is arranged on the protective door, when the protective door reaches the door opening position, the limit block abuts against one of the limit switches, and when the protective door reaches the door closing position, the limit block abuts against the other limit switch; A control unit is control-connected with the cylinder transmission assembly and the limit switch assembly.

2. The vertical machining center cylinder protection automatic door device according to claim 1 is characterized in that: The other end of the three-position five-way center-drain solenoid valve is provided with a straight-through joint, 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 joint through a Y-type pipe.

3. The vertical machining center cylinder protection automatic door device according to claim 2 is 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, 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 is arranged toward the telescopic cylinder, the four side walls are respectively provided with oblong holes, and the two side portions of the U-shaped bracket are respectively provided with mounting holes, and the oblong holes are correspondingly connected to the mounting holes.

4. The cylinder protection automatic door device for a vertical machining center according to claim 3 is characterized in that: The bottom of the U-shaped bracket is connected with a double earring support, and the output end of the telescopic cylinder is provided with a joint bearing, and the joint bearing extends to the inside of the double earring support.

5. The vertical machining center cylinder protection automatic door device according to claim 3 is characterized in that: The two supporting ears 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. The positioning pin is located on the outer side of the first pin hole and is fixed by a buckle.

6. The vertical machining center cylinder protection automatic door device according to claim 1 is characterized in that: The limit switch assembly also includes a wiring groove arranged in the vertical machining center protection room above the opening, and a pair of limit switches are arranged at intervals on the wiring groove.

7. The vertical machining center cylinder protection automatic door device according to claim 6 is characterized in that: The limit switch comprises 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 vertical machining center cylinder protection automatic door device according to claim 7 is characterized in that: A rotation angle sensor is arranged in the limit switch body, an output end of the rotation angle sensor is connected to the guide swing arm, and the rotation angle sensor is control-connected to the control unit.

9. The vertical machining center cylinder protection automatic door device according to claim 1, characterized in that: The protective door is provided with a door handle and an observation window.

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

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