A kind of mute performance and motion trajectory test equipment of automobile hidden door handle

Abstract

The utility model discloses a kind of mute performance and motion trail test equipment of automobile hidden type door handle, including rack, be located on the soundproof chamber of rack, code scanner, button point touch mechanism, noise detection device and distance detection device, soundproof chamber is equipped with chamber mouth, from chamber mouth inserts hidden type door handle assembly, soundproof chamber is equipped with the wire outlet of connecting hidden type door handle assembly power supply, chamber mouth is equipped with movable door, code scanner is used to carry out bar code or two-dimensional code code scanning record to hidden type door handle assembly, button point touch mechanism is used to point touch the door handle button on hidden type door handle assembly, noise detection device is used to detect the sound size when the door handle of hidden type door handle assembly stretches out, distance detection device is used to detect the stretch-out amount of the door handle of hidden type door handle assembly. Detect the sound generated when door handle stretches out, test its mute performance, whether the motion trail of displacement amount test of door handle stretching out is qualified by distance detection device.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a testing device for the noise performance and movement trajectory of a car's hidden door handle. Background Technology

[0002] Hidden door handles are a design that integrates traditional exposed door handles with the vehicle body, achieving a combination of aesthetics and functionality through a concealed structure. When in use, the door handle pops out from the inside of the door; when not in use, it retracts, making the door surface smoother. Because hidden door handles offer advantages such as reduced wind resistance and improved vehicle aesthetics, they are widely used in various vehicles. However, during the pop-out or pull-out process, hidden door handle assemblies may produce abnormal noises. Asynchronous pop-out at both ends of the handle may indicate problems with the motor gear assembly, abnormal friction between the telescopic track and the hinge, or improper assembly of internal components causing friction or collision. Therefore, hidden door handle assemblies undergo performance testing before leaving the factory or during installation on vehicle doors. This includes testing their noise reduction performance and pop-out trajectory to determine the quality of the door handle assembly and provide quality assurance. Utility Model Content

[0003] In view of this, this utility model proposes a test device for the noise reduction performance and motion trajectory of a car hidden door handle. The device tests the noise reduction performance and motion trajectory to detect the quality of the hidden door handle assembly, thus providing quality assurance for the hidden door handle assembly.

[0004] The specific solution of this utility model is a device for testing the noise performance and movement trajectory of a hidden door handle for automobiles, comprising:

[0005] frame;

[0006] A soundproof chamber is provided on the frame. The soundproof chamber has a chamber opening through which a concealed door handle assembly is inserted. The soundproof chamber is provided with a ribbon cable socket for powering the concealed door handle assembly. The chamber opening is provided with a movable door.

[0007] A barcode scanner, located inside the soundproof chamber, is used to scan and record barcodes or QR codes on the concealed door handle assembly.

[0008] A button touch mechanism is located in the soundproof cavity and is used to touch the door handle button on the concealed door handle assembly;

[0009] A noise detection device is installed in the soundproof cavity to detect the sound level generated when the door handle of the concealed door handle assembly is extended;

[0010] A distance detection device is installed in the soundproof cavity to detect the extension of the door handle of the concealed door handle assembly.

[0011] Furthermore, the button touch mechanism adopts a first single-rod double-acting cylinder, which is mounted by setting a first bracket, and the front end of the piston rod of the first single-rod double-acting cylinder points directly in front of the door handle button.

[0012] Furthermore, the noise detection device employs a noise spectrum analyzer, and the microphone of the noise spectrum analyzer is fixed inside the soundproof cavity by a second bracket.

[0013] Furthermore, the distance detection device employs two sets of laser sensors, which are fixed by a third bracket. The lasers from the two sets of laser sensors are respectively perpendicularly irradiated to both ends of the door handle protruding surface of the concealed door handle assembly.

[0014] Furthermore, the soundproof chamber is equipped with a linear transfer platform, which includes a supporting base plate, a left side plate and a right side plate respectively disposed on the left and right sides of the supporting base plate, a left slider and a right slider respectively disposed opposite to each other on the inner sides of the left side plate and the right side plate, a left slide rail and a right slider respectively disposed on the left slider and the right slider, a movable carrier plate disposed on the left slide rail and the right slide rail, and a driving mechanism disposed on the supporting base plate for driving the movable carrier plate to move back and forth along the left slide rail and the left slider, and the right slide rail and the right slider. The back and forth movement of the movable carrier plate realizes that the movable carrier plate is pushed out of the chamber opening and pulled into the soundproof chamber. The upper surface of the movable carrier plate near the front end is the placement area of ​​the hidden door handle assembly. The ribbon cable socket is disposed in the placement area, and a first bracket and a third bracket are disposed in the rear area corresponding to the placement area.

[0015] Furthermore, the drive mechanism adopts a ball screw module, which includes support bearings respectively set at the front and rear ends of the support base plate, a screw set on the support bearings, a nut slider sleeved on the screw, a nut seat sleeved on the nut slider, and a servo motor for driving the screw to rotate. The nut seat is connected to the bottom of the movable carrier plate near the rear end. The rear end of the screw passes through the rear side of the support bearing and is connected to a synchronous pulley. The output shaft of the servo motor is equipped with a drive wheel. The drive wheel and the synchronous pulley are connected by a synchronous belt, and the screw is driven to rotate by the servo motor.

[0016] Furthermore, the movable carrier plate is provided with a corner pressing cylinder on the side of the concealed door handle assembly, and the pressing rod of the corner pressing cylinder is used to press the concealed door handle assembly.

[0017] Furthermore, a double-rod push cylinder is provided in the rear area of ​​the movable carrier plate. The front end of the push rod of the double-rod push cylinder is connected to a thumb cylinder. When the push rod of the double-rod push cylinder is extended, the gripper of the thumb cylinder clamps the door handle that extends from the concealed door handle assembly. When the push rod of the double-rod push cylinder is retracted, the thumb cylinder will pull the door handle.

[0018] Furthermore, the soundproof chamber includes an inner cavity wall, an intermediate cavity wall surrounding the inner cavity wall, and an outer cavity wall surrounding the intermediate cavity wall. The inner cavity wall and the outer cavity wall are made of steel plates, the intermediate cavity wall is made of microporous aluminum plates, and sound-absorbing cotton is filled between the intermediate cavity wall and the inner cavity wall.

[0019] Furthermore, a second single-rod double-acting cylinder is provided on each of the left and right sides of the chamber opening corresponding to the outer cavity wall. The two second single-rod double-acting cylinders are arranged in parallel, and a movable door is connected between the piston rods of the two second single-rod double-acting cylinders. When the piston rods of the two second single-rod double-acting cylinders extend, they drive the movable door to descend to the movable door receiving cavity provided on the front side of the frame. When the piston rods of the two second single-rod double-acting cylinders retract, they drive the movable door to rise to the chamber opening and close the chamber opening.

[0020] The technical solution disclosed in this utility model has at least the following beneficial effects:

[0021] The testing equipment disclosed in this technical solution is used to test the noise reduction performance and movement trajectory of concealed door handles in automobiles. It involves placing the concealed door handle assembly into a soundproof chamber, connecting it to a wiring harness connector, and using a barcode scanner to scan and record the assembly's identification information. A button-activated mechanism triggers the door handle to extend when the button is pressed. The sound produced during the extension is detected to test its noise reduction performance. Simultaneously, a distance detection device measures the displacement of the extended door handle to test its movement trajectory.

[0022] A linear transfer platform is installed. The moving carrier plate of the platform can be moved out of the chamber opening when the concealed door handle assembly needs to be placed inside. A drive mechanism then moves the carrier plate into the soundproofing chamber, making it easier to place the concealed door handle assembly. Similarly, after testing, the drive mechanism moves the carrier plate out of the chamber opening, facilitating the removal of the concealed door handle assembly after testing. Attached Figure Description

[0023] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this disclosure together with the specification and serve to explain the principles of this disclosure.

[0024] Figure 1 This is a three-dimensional view of the overall structure of the testing equipment disclosed in an embodiment of this utility model.

[0025] Figure 2 This is a schematic diagram of the extended linear transfer platform of the testing equipment disclosed in this embodiment of the utility model.

[0026] Figure 3 This is a schematic diagram of the assembly structure of the linear transfer platform for the testing equipment disclosed in this embodiment of the present utility model.

[0027] Figure 4 This is an exploded view of the concealed door handle assembly and clamp disclosed in an embodiment of the present utility model.

[0028] Figure 5 This is a schematic diagram of the connection between the concealed door handle assembly and the clamp disclosed in an embodiment of the present utility model.

[0029] Figure 6 This is a schematic diagram of the bottom structure of the clamp disclosed in an embodiment of this utility model.

[0030] Figure 7 The concealed door handle assembly disclosed in this embodiment of the present utility model is placed on a movable carrier plate by a clamp, and the first single-lever double-acting cylinder touches the door handle button.

[0031] Figure 8 This is a schematic diagram of a concealed door handle assembly, as disclosed in an embodiment of the present invention, placed on a movable carrier plate, with a thumb cylinder pulling the door handle.

[0032] Figure 9 This is a schematic diagram of a structure for a second single-rod double-acting cylinder and a movable door at the opening of a soundproof chamber, as disclosed in an embodiment of this utility model.

[0033] Figure 10 A side view of the cavity opening of the soundproof chamber disclosed in this embodiment of the present invention, showing the installation of a second single-rod double-acting cylinder.

[0034] Figure 11 This is a cross-sectional view of the soundproof chamber disclosed in an embodiment of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Frame; 2. Soundproof chamber; 21. Chamber opening; 22. Cable connector; 201. Inner cavity wall; 202. Intermediate cavity wall; 203. Outer cavity wall; 23. Barcode scanner; 4. First single-lever double-acting cylinder; 41. First bracket; 5. Microphone; 51. Second bracket; 6. Laser sensor; 61. Third bracket; 7. Linear transfer platform; 701. Support base plate; 702. Left side plate; 703. Right side plate; 704. Left slider; 705. Right slider; 706. Left slide rail; 707. Right slide rail; 708. Moving carrier Plate; 709, Support bearing; 710, Screw; 711, Nut slider; 712, Nut seat; 713, Servo motor; 714, Drive wheel; 715, Synchronous pulley; 716, Synchronous belt; 8, Corner pressing cylinder; 801, Pressing rod; 9, Double rod push cylinder; 10, Thumb cylinder; 1001, Gripper; 11, Second single rod double-acting cylinder; 12, Movable door; 13, Display screen; 14, Keyboard and mouse holder; 01, Concealed door handle assembly; 011, Door handle; 012, Door handle button; 02, Fixture. Detailed Implementation

[0037] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this disclosure.

[0038] Please refer to Figures 1 to 10This is a specific embodiment of a device for testing the noise reduction performance and motion trajectory of a concealed car door handle, as disclosed in this solution. In this embodiment, it includes a frame 1, a soundproof chamber 2, a barcode scanner 23, a button touch mechanism, a noise detection device, and a distance detection device. The soundproof chamber 2 is mounted on the frame 1 and has a chamber opening 21 through which a concealed door handle assembly 01 is inserted. The soundproof chamber 2 has a ribbon cable connector 22 for powering the concealed door handle assembly 01. The chamber opening 21 has a movable door 12. The barcode scanner 23 is located inside the soundproof chamber 2. The system is used to scan and record barcodes or QR codes on the concealed door handle assembly 01. Each concealed door handle assembly 01 will have a barcode or QR code recording the model, name, and production batch information. The button touch mechanism is located in the soundproof chamber 2 and is used to touch the door handle button 012 on the concealed door handle assembly 01. The noise detection device is located in the soundproof chamber 2 and is used to detect the sound level generated when the door handle 011 of the concealed door handle assembly 01 is extended. The distance detection device is located in the soundproof chamber 2 and is used to detect the extension amount of the door handle 011 of the concealed door handle assembly 01. In this embodiment, the concealed door handle assembly 01 is placed inside the soundproof chamber 2 and connected to the ribbon cable connector 22. A barcode scanner 23 scans the concealed door handle assembly 01 to record its identification information. A button-touch mechanism triggers the door handle 011 to extend by touching the door handle button 012. The sound produced when the door handle 011 extends is detected to test its noise reduction performance. Simultaneously, a distance detection device detects the displacement of the extended door handle 011 to test its movement trajectory.

[0039] In this embodiment, the button touch mechanism uses a first single-rod double-acting cylinder 4, which is mounted via a first bracket 41. The front end of the piston rod of the first single-rod double-acting cylinder 4 points directly in front of the door handle button 012. The noise detection device uses a noise spectrum analyzer, and the microphone 5 of the noise spectrum analyzer is fixed inside the soundproof chamber 2 via a second bracket 51. The distance detection device uses two sets of laser sensors 6, which are fixed via a third bracket 61. The lasers from the two sets of laser sensors 6 are respectively perpendicularly irradiated to both ends of the protruding surface of the door handle 011 of the concealed door handle assembly 01.

[0040] In this embodiment, preferably, the soundproof chamber 2 is provided with a linear transfer platform 7. The linear transfer platform 7 includes a supporting base plate 701, a left side plate 702 and a right side plate 703 respectively disposed on the left and right sides of the supporting base plate 701, a left slider 704 and a right slider 705 respectively disposed opposite to each other inside the left side plate 702 and the right side plate 703, a left slide rail 706 and a right slider 705 respectively disposed on the left slider 704 and the right slider 705, a movable carrier plate 708 disposed on the left slide rail 706 and the right slide rail 707, and a support base plate 708 disposed on the support base plate 701. The base plate 701 has a driving mechanism for driving the movable carrier plate 708 to move back and forth along the left slide rail 706 and the left slider 704, and the right slide rail 707 and the right slider 705. The back and forth movement of the movable carrier plate 708 enables the movable carrier plate 708 to be pushed out of the cavity opening 21 and pulled into the soundproof cavity 2. The upper plate surface of the movable carrier plate 708 near the front end is the placement area of ​​the hidden door handle assembly 01. The ribbon cable socket 22 is set in the placement area. The first bracket 41 and the third bracket 61 are set in the rear area corresponding to the placement area.

[0041] As one of the preferred solutions for the drive mechanism, the drive mechanism adopts a ball screw module. The ball screw module includes a support bearing 709 respectively set at the front and rear ends of the support base plate 701, a screw 710 set on the support bearing 709, a nut slider 711 sleeved on the screw 710, a nut seat 712 sleeved on the nut slider 711, and a servo motor 713 that drives the screw 710 to rotate. The nut seat 712 is connected to the bottom of the movable carrier plate 708 near the rear end. The rear end of the screw 710 passes through the rear side of the support bearing 709 and is connected to a synchronous pulley 715. The output shaft of the servo motor 713 is provided with a drive wheel 714. The drive wheel 714 and the synchronous pulley 715 are connected by a synchronous belt 716. The servo motor 713 drives the screw 710 to rotate.

[0042] By setting up a linear transfer platform 7, the movable carrier plate 708 of the linear transfer platform 7 can move out of the chamber opening 21 when the concealed door handle assembly 01 needs to be placed. The drive mechanism then moves the movable carrier plate 708 into the soundproof chamber 2, making it easier to place the concealed door handle assembly 01 into the soundproof chamber 2. Similarly, after the test is completed, the drive mechanism moves the movable carrier plate 708 out of the chamber opening 21, making it convenient to remove the concealed door handle assembly 01 after the test.

[0043] Preferably, the movable carrier plate 708 is provided with a corner-pressing cylinder 8 on the side corresponding to the concealed door handle assembly 01. The pressing rod 801 of the corner-pressing cylinder 8 is used to press the concealed door handle assembly 01. The corner-pressing cylinder 8 helps to fix the concealed door handle assembly 01 in place with the clamp 02, making it less prone to shaking. It should be noted that the clamp 02 used to place and fix the concealed door handle assembly 01 is adapted to the specific structure of the concealed door handle assembly 01. In this solution, it is not used for structural protection of the concealed door handle assembly 01 and the clamp 02.

[0044] Please refer to Figure 8 Preferably, a double-rod push cylinder 9 is provided in the rear region of the movable carrier plate 708. The push rod of the double-rod push cylinder 9 is connected to a thumb cylinder 10. When the push rod of the double-rod push cylinder 9 is extended, the gripper 1001 of the thumb cylinder 10 clamps the extended door handle 011 of the concealed door handle assembly 01. When the push rod of the double-rod push cylinder 9 retracts, the thumb cylinder 10 pulls the door handle 011. It should be understood that not all concealed door handle assemblies 01 have their door handle 011 extended by the internal mechanism and can still be pulled forward further. The double-rod push cylinder 9 and thumb cylinder 10 are designed for concealed door handle assemblies 01 that can be pulled forward further. They are used to detect the displacement of both ends of the door handle 011 when it continues to be pulled forward, thereby determining whether the concealed door handle assembly 01 is qualified. This design is compatible with both types of concealed door handles.

[0045] Please refer to Figure 11 The soundproof chamber 2 includes an inner cavity wall 201, an intermediate cavity wall 202 surrounding the inner cavity wall 201, and an outer cavity wall 203 surrounding the intermediate cavity wall 202. The inner cavity wall 201 and the outer cavity wall 203 are made of steel plates, the intermediate cavity wall is made of microporous aluminum plates, and sound-absorbing cotton is filled between the intermediate cavity wall 202 and the inner cavity wall 201.

[0046] Please refer to Figure 9 , Figure 10A second single-rod double-acting cylinder 11 is provided on each of the left and right sides of the chamber opening 21 corresponding to the outer cavity wall 203. The two second single-rod double-acting cylinders 11 are arranged in parallel, and a movable door 12 is connected between the piston rods of the two second single-rod double-acting cylinders 11. When the piston rods of the two second single-rod double-acting cylinders 11 extend, they drive the movable door 12 to descend to the movable door 12 receiving cavity provided on the front side of the frame 1. When the piston rods of the two second single-rod double-acting cylinders 11 retract, they drive the movable door 12 to rise to the chamber opening 21, closing the chamber opening 21. Since the upper end of the second single-rod double-acting cylinder 11 is set at an angle to the outer cavity wall 203, and the lower end of the piston rod of the second single-rod double-acting cylinder 11 is relative to the outer cavity wall 203, the movable door 12 is also inclined towards the outer cavity wall 203. Therefore, when the movable door 12 is driven to rise, it can cover the chamber opening 21.

[0047] Please refer to Figure 1 The figure shows a display screen 13 above the chamber opening 21 and a keyboard and mouse tray 14 for placing a keyboard and mouse on the lower front side of the chamber opening 21. For those not described in the above technical solution, such as a computer host, multiple air pumps, and a PLC controller located inside the soundproof cavity corresponding to the frame 1, the multiple air pumps are respectively connected to a first single-rod double-acting cylinder 4, a second single-rod double-acting cylinder 11, a corner pressing cylinder 8, a double-rod pushing cylinder 9, and a thumb cylinder 10 through air pipes, and the PLC controller controls the above cylinders and servo motor 713, and the detection signals of the noise spectrum analyzer and laser sensor 6 are input to the computer host and displayed on the display screen 13 through the software system. This is the prior art in the relevant technical field, so it will not be described in detail here.

[0048] The parts not described in detail in this technical solution specification are obvious to those skilled in the art and can be supplemented and improved based on existing technical knowledge. At the same time, those skilled in the art should understand that the above embodiments are merely preferred embodiments of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A device for testing the noise reduction performance and motion trajectory of a concealed car door handle, characterized in that, include: frame; A soundproof chamber is provided on the frame. The soundproof chamber has a chamber opening through which a concealed door handle assembly is inserted. The soundproof chamber is provided with a ribbon cable socket for powering the concealed door handle assembly. The chamber opening is provided with a movable door. A barcode scanner, located inside the soundproof chamber, is used to scan and record barcodes or QR codes on the concealed door handle assembly. A button touch mechanism is located in the soundproof cavity and is used to touch the door handle button on the concealed door handle assembly; A noise detection device is installed in the soundproof cavity to detect the sound level generated when the door handle of the concealed door handle assembly is extended; A distance detection device is installed in the soundproof cavity to detect the extension of the door handle of the concealed door handle assembly.

2. The testing equipment for the noise reduction performance and motion trajectory of a concealed car door handle according to claim 1, characterized in that, The button touch mechanism adopts a first single-rod double-acting cylinder, which is mounted by a first bracket, and the front end of the piston rod of the first single-rod double-acting cylinder points directly in front of the door handle button.

3. The testing equipment for the noise reduction performance and motion trajectory of a concealed car door handle according to claim 2, characterized in that, The noise detection device uses a noise spectrum analyzer, and the microphone of the noise spectrum analyzer is fixed inside the soundproof cavity by a second bracket.

4. The testing equipment for the noise reduction performance and motion trajectory of a concealed car door handle according to claim 3, characterized in that, The distance detection device uses two sets of laser sensors, which are fixed by a third bracket. The lasers from the two sets of laser sensors are respectively perpendicularly irradiated to both ends of the door handle protruding surface of the concealed door handle assembly.

5. The testing equipment for the noise reduction performance and motion trajectory of a concealed car door handle according to claim 4, characterized in that, The soundproof chamber is equipped with a linear transfer platform, which includes a supporting base plate, a left side plate and a right side plate respectively disposed on the left and right sides of the supporting base plate, a left slider and a right slider respectively disposed on the inner sides of the left side plate and the right side plate, a left slide rail and a right slider respectively disposed on the left slider and the right slider, a movable carrier plate disposed on the left slide rail and the right slide rail, and a driving mechanism disposed on the supporting base plate for driving the movable carrier plate to move back and forth along the left slide rail and the left slider, and the right slide rail and the right slider. The back and forth movement of the movable carrier plate realizes that the movable carrier plate is pushed out of the chamber opening and pulled into the soundproof chamber. The upper surface of the movable carrier plate near the front end is the placement area of ​​the hidden door handle assembly. The ribbon cable socket is disposed in the placement area, and a first bracket and a third bracket are disposed in the rear area corresponding to the placement area.

6. The testing equipment for the noise reduction performance and motion trajectory of a concealed car door handle according to claim 5, characterized in that, The drive mechanism adopts a ball screw module, which includes support bearings respectively set at the front and rear ends of the support base plate, a screw set on the support bearings, a nut slider sleeved on the screw, a nut seat sleeved on the nut slider, and a servo motor for driving the screw to rotate. The nut seat is connected to the bottom of the moving carrier plate near the rear end. The rear end of the screw passes through the rear side of the support bearing and is connected to a synchronous pulley. The output shaft of the servo motor is equipped with a drive wheel. The drive wheel and the synchronous pulley are connected by a synchronous belt, and the screw is driven to rotate by the servo motor.

7. The testing equipment for the noise reduction performance and motion trajectory of a concealed door handle for automobiles according to claim 5, characterized in that, The movable carrier plate is equipped with a corner-pressing cylinder on the side of the concealed door handle assembly. The pressing rod of the corner-pressing cylinder is used to press the concealed door handle assembly.

8. The testing equipment for the noise reduction performance and motion trajectory of a concealed door handle for automobiles according to claim 5, characterized in that, A double-rod push cylinder is provided in the rear area of ​​the movable carrier plate. The push rod of the double-rod push cylinder is connected to a thumb cylinder. When the push rod of the double-rod push cylinder is extended, the gripper of the thumb cylinder clamps the door handle that extends from the concealed door handle assembly. When the push rod of the double-rod push cylinder is retracted, the thumb cylinder will pull the door handle.

9. The testing equipment for the noise reduction performance and motion trajectory of a concealed door handle for automobiles according to claim 1, characterized in that, The soundproof chamber includes an inner cavity wall, an intermediate cavity wall surrounding the inner cavity wall, and an outer cavity wall surrounding the intermediate cavity wall. The inner and outer cavity walls are made of steel plates, the intermediate cavity wall is made of microporous aluminum plates, and sound-absorbing cotton is filled between the intermediate cavity wall and the inner cavity wall.

10. The testing equipment for the noise reduction performance and motion trajectory of a concealed door handle for automobiles according to claim 9, characterized in that, A second single-rod double-acting cylinder is provided on each of the left and right sides of the chamber opening corresponding to the outer cavity wall. The two second single-rod double-acting cylinders are arranged in parallel. A movable door is connected between the piston rods of the two second single-rod double-acting cylinders. When the piston rods of the two second single-rod double-acting cylinders extend, they drive the movable door to descend to the movable door receiving cavity provided on the front side of the frame. When the piston rods of the two second single-rod double-acting cylinders retract, they drive the movable door to rise to the chamber opening and close the chamber opening.

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