A windbox pneumatic braking device

Abstract

This invention relates to the field of bellows technology, and in particular to a pneumatic braking device for a bellows, comprising a base, a drive mechanism disposed on the upper side of the base, a folding bellows connected to the drive mechanism, and the drive mechanism controlling the unfolding or folding of the folding bellows; an air supply pipe is fixedly installed at the end of the folding bellows away from the base, and the air supply pipe communicates with the interior of the folding bellows; the folding bellows includes an upper end plate and a folding bladder, the upper end of the folding bladder being fixedly and sealingly connected to the upper end plate; the drive mechanism drives the folding bladder to unfold or fold. In use, the amount of gas in the pneumatic interactive device can be controlled more intuitively, improving the display effect of the pneumatic interactive device.

Description

Technical Field

[0001] This invention relates to the field of bellows technology, and in particular to a pneumatic braking device for bellows. Background Technology

[0002] In business and daily life, there are often scenarios where controlling airflow to change the shape of actuators to achieve different purposes is necessary. For example, pneumatic interactive installations in indoor exhibitions. Pneumatic interactive installations, which use air as a medium, are characterized by their large size, light weight, quick installation, and safety.

[0003] In existing technologies, pneumatic interactive devices are generally controlled by mechanical means such as air compressors and vacuum pumps to cause them to change shape. However, this control method cannot achieve precise control during the air supply and extraction processes. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a bellows pneumatic braking device that can more intuitively control the amount of gas in the pneumatic interactive device, thereby improving the display effect of the pneumatic interactive device.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides a pneumatic braking device for a bellows, including a base, a drive mechanism on the upper side of the base, a folding bellows connected to the drive mechanism, and the drive mechanism controlling the folding bellows to unfold or fold; an air supply pipe is fixedly installed at the end of the folding bellows away from the base, and the air supply pipe communicates with the interior of the folding bellows; the folding bellows includes an upper end plate and a folding bladder, the upper end of the folding bladder being fixedly and sealingly connected to the upper end plate; the drive mechanism drives the folding bladder to unfold or fold.

[0008] Preferably, the drive mechanism includes a first geared motor fixedly mounted on the upper side of the upper end plate, a drive sprocket fixedly mounted on the output shaft of the first geared motor, and driven sprockets fixed at equal angular intervals on the circumferential side of the upper end plate. The driven sprockets and the drive sprocket are connected by a first chain. Multiple adjusting screws are spaced apart on the circumferential side of the folding bellows, each adjusting screw corresponding to a driven sprocket. One end of each adjusting screw is rotatably connected to the base, and the other end is fixedly connected to a driven sprocket. A fixing plate is provided at the end of the folding bellows away from the upper end plate. Multiple fixing plates are provided, each corresponding to a adjusting screw. The fixing plate is sleeved on the adjusting screw and threadedly connected to it.

[0009] Preferably, a threaded sleeve is fixedly provided in the middle of the fixing plate, the threaded sleeve is vertically arranged, and the fixing plate is threadedly connected to the adjusting screw through the threaded sleeve.

[0010] Preferably, a first positioning sprocket and a second positioning sprocket are provided on the upper side of the upper end plate, and the first chain passes sequentially on the same side of the first positioning sprocket and the second positioning sprocket; a secondary air box is suspended on the lower side of the upper end plate and located inside the folding air box, and an adjustment mechanism for controlling the exhaust or suction of the secondary air box is provided on the upper end plate.

[0011] Preferably, the end of the secondary air box away from the upper end plate forms a communication port, which communicates with the inner cavity of the foldable air box; the adjusting mechanism includes a piston plate slidably disposed within the secondary air box, the edge of the piston plate sealingly abutting against the inner wall of the secondary air box; the inner cavity of the secondary air box and the piston plate are rectangular; a guide post is integrally formed on the side of the piston plate near the communication port, and a threaded hole is formed in the middle of the guide post, the threaded hole penetrating the end of the guide post near the upper end plate; a lifting screw is rotatably connected to the upper end plate, the lower end of the lifting screw being located in the threaded hole and threadedly connected to the threaded hole. The upper end of the lifting screw is located on the upper side of the upper end plate and is fixedly connected to an adjusting sprocket; the upper side of the upper end plate is also provided with a linear movement component and an elastic buffer component, the moving end of the linear movement component is connected to a first double-row sprocket, and the moving end of the elastic buffer component is connected to a second double-row sprocket; a second chain is connected between the first double-row sprocket, the second double-row sprocket and the adjusting sprocket, and the second chain has a triangular shape after connection; the first double-row sprocket moves on the vertical line between the first positioning sprocket and the second positioning sprocket, and during movement, the first double-row sprocket can engage or disengage with the first chain.

[0012] Preferably, the linear motion assembly includes an electric push rod fixed to the upper side of the upper end plate, the piston of the electric push rod is connected to a first guide block, the upper side of the first guide block is rotatably connected to the first double-row sprocket; a guide groove is provided on the upper side of the upper end plate along the vertical line direction, and the side of the first guide block away from the first double-row sprocket is slidably connected to the guide groove.

[0013] Preferably, the elastic buffer assembly includes a buffer sleeve fixed to the upper side of the upper end plate, a buffer post slidably connected inside the buffer sleeve, one end of the buffer sleeve being closed, one end of the buffer post being located inside the buffer sleeve, and the other end extending out of the buffer sleeve and connected to a second guide block, the upper side of the second guide block being connected to a second double-row sprocket; a baffle is provided at the end of the buffer post located inside the buffer sleeve, a compression spring is provided inside the buffer sleeve, one end of the compression spring abutting against the baffle, and the other end abutting against the bottom of the buffer sleeve; a limit ring is threadedly connected to the open end of the buffer sleeve, the inner diameter of the limit ring being smaller than the diameter of the baffle.

[0014] Preferably, a secondary drive assembly is provided on the upper end plate. The secondary drive assembly is close to the second double-row sprocket. When the first double-row sprocket is separated from the first chain, the secondary drive assembly is connected to the second double-row sprocket and can control the rotation of the second double-row sprocket.

[0015] Preferably, the secondary drive assembly includes a second geared motor mounted on the upper side of the upper end plate, a third positioning sprocket connected to the output shaft of the second geared motor, and a fourth positioning sprocket rotatably connected to the upper end plate and located on one side of the second geared motor. A third chain connects the third positioning sprocket and the fourth positioning sprocket. When the linear motion assembly controls the first double-row sprocket to disengage from the first chain, the second double-row sprocket abuts against the third chain under the action of the elastic buffer assembly.

[0016] Preferably, a first pressure sensor is provided at the bottom of the secondary air box, and a second pressure sensor is provided at one end of the secondary air box near the communication port. When the piston plate abuts against the first pressure sensor or the second pressure sensor, the first double-row sprocket disengages from the first chain.

[0017] (III) Beneficial Effects

[0018] This invention provides a pneumatic braking device for a bellows. When it is necessary to supply or evacuate air to change the shape of a pneumatic interactive device, a foldable bellows and a drive mechanism work together to supply or evacuate air to the device, thereby enabling it to perform different actions. Simultaneously, during the action demonstration, a secondary bellows and an adjustment mechanism located within the foldable bellows can work in conjunction with the secondary bellows to instantly increase the air supply and suction volume, thus allowing the pneumatic interactive device to display different actions or amplitudes of movement, improving the exhibition effect of the pneumatic interactive device. Furthermore, when controlling the secondary bellows, the device uses an adjustment mechanism to achieve linkage with the drive mechanism, and a first geared motor controls both to synchronously supply or evacuate air. In addition, a second geared motor can be used for independent control, enabling reverse air supply or suction, reducing the air supply volume, or returning to the original state.

[0019] This device allows for intuitive control of the gas volume within the pneumatic interactive installation, simplifying the control of inflation and deflation speed and volume. During the exhibition and display of interactive art installations, the debugging and control of these installations are crucial. Simple operation and intuitive control reduce installation and maintenance costs, lower manpower requirements, and increase the stability and controllability of the device. Through the mutual conversion of mechanical and gas energy, it reduces the safety hazards associated with high-pressure gas storage in traditional pneumatic devices such as air compressors and vacuum machines, lowers the heat load, and facilitates the installation and long-term use of pneumatic devices in enclosed spaces. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a protruding drive mechanism driving a folding bellows in a pneumatic braking device for a bellows according to the present invention.

[0021] Figure 2 This is a schematic diagram of the protruding adjustment mechanism in a pneumatic braking device for a bellows according to the present invention;

[0022] Figure 3 This is a cross-sectional view of a protruding secondary air box in a pneumatic braking device for an air box according to the present invention;

[0023] Figure 4 This is a schematic diagram of a protruding linear movement component in a pneumatic braking device for a bellows according to the present invention;

[0024] Figure 5 This is a cross-sectional view of a protruding elastic buffer component in a pneumatic braking device for a bellows according to the present invention.

[0025] Marked in the attached diagram:

[0026] 100. Base; 200. Drive mechanism; 210. First geared motor; 220. Drive sprocket; 230. Driven sprocket; 240. First chain; 250. Adjusting screw; 260. Fixing plate; 261. Threaded sleeve; 270. First positioning sprocket; 280. Second positioning sprocket; 300. Folding bellows; 310. Upper end plate; 311. Guide groove; 320. Folding bladder; 400. Air supply pipe; 500. Secondary bellows; 510. Connecting port; 520. First pressure sensor; 530. Second pressure sensor; 600. Adjusting mechanism; 610. Piston Plate; 620, Guide post; 621, Threaded hole; 630, Lifting screw; 640, Adjusting sprocket; 650, Linear movement assembly; 651, Electric push rod; 652, First guide block; 660, Elastic buffer assembly; 661, Buffer sleeve; 662, Buffer post; 663, Second guide block; 664, Baffle; 665, Compression spring; 666, Limiting ring; 670, First double-row sprocket; 680, Second double-row sprocket; 690, Second chain; 700, Secondary drive assembly; 710, Third positioning sprocket; 720, Fourth positioning sprocket; 730, Third chain. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example

[0029] This invention provides a pneumatic braking device for a bellows, see [link / reference]. Figures 1-5 The device includes a base 100, a drive mechanism 200 on the upper side of the base 100, and a folding bellows 300 connected to the drive mechanism 200. The drive mechanism 200 controls the folding bellows 300 to unfold or fold. An air supply pipe 400 is fixedly installed at the end of the folding bellows 300 away from the base 100, and the air supply pipe 400 communicates with the interior of the folding bellows 300. During operation, the drive mechanism 200 controls the unfolding or folding of the folding bellows 300. During this unfolding or folding process, air is supplied or drawn into the pneumatic interactive device through the air supply pipe 400, thereby enabling it to perform different actions.

[0030] The foldable bellows 300 includes an upper end plate 310 and a foldable bladder 320. The upper end of the foldable bladder 320 is fixed and sealed to the upper end plate 310. The drive mechanism 200 drives the foldable bladder 320 to unfold or fold.

[0031] The drive mechanism 200 includes a first geared motor 210 fixedly mounted on the upper side of the upper end plate 310. A drive sprocket 220 is fixedly mounted on the output shaft of the first geared motor 210. Multiple driven sprockets 230 are fixed at equal angular intervals on the circumference of the upper end plate 310. The multiple driven sprockets 230 and the drive sprocket 220 are connected by a first chain 240. It is understood that the drive sprocket 220 and the driven sprockets 230 are located on the same horizontal plane. After the first chain 240 is installed, the first geared motor 210 can control the synchronous rotation of the multiple driven sprockets 230.

[0032] Multiple adjusting screws 250 are spaced apart on the circumference of the folding bellows 300. Each adjusting screw 250 corresponds to a driven sprocket 230. One end of the adjusting screw 250 is rotatably connected to the base 100, and the other end is fixedly connected to the driven sprocket 230. When the multiple driven sprockets 230 rotate synchronously, they drive the adjusting screws 250 fixedly connected to them to rotate synchronously.

[0033] A fixing plate 260 is provided at the end of the folding bellows 300 away from the upper end plate 310. Multiple fixing plates 260 are provided, each corresponding to an adjusting screw 250. The fixing plate 260 is sleeved on the adjusting screw 250 and threadedly connected to it. Specifically, a threaded sleeve 261 is fixedly provided in the middle of the fixing plate 260. The threaded sleeve 261 is vertically positioned, and the fixing plate 260 is threadedly connected to the adjusting screw 250 through the threaded sleeve 261. When the adjusting screws 250 rotate synchronously, because of the threaded connection with the threaded sleeve 261, when the multiple adjusting screws 250 rotate independently, the multiple fixing plates 260 cannot rotate with the adjusting screws 250. Therefore, when the adjusting screws 250 rotate, they will drive the fixing plates 260 to move vertically through the threaded sleeves 261, thereby driving the folding bellows 300 to unfold and fold.

[0034] A first positioning sprocket 270 and a second positioning sprocket 280 are provided on the upper side of the upper end plate 310. The first chain 240 passes sequentially on the same side of the first positioning sprocket 270 and the second positioning sprocket 280. A secondary air box 500 is suspended on the lower side of the upper end plate 310 and inside the folding air box 300. An adjustment mechanism 600 for controlling the exhaust or intake of the secondary air box 500 is provided on the upper end plate 310. When it is necessary to supply or draw air to the pneumatic interactive device, the instantaneous air supply and intake volume can be increased by the secondary air box 500 and the adjustment mechanism 600 located in the folding air box 300, thereby changing the amplitude of the action of starting the interactive device.

[0035] Specifically, the end of the secondary air box 500 away from the upper end plate 310 forms a connecting port 510, which is connected to the inner cavity of the folding air box 300.

[0036] The regulating mechanism 600 includes a piston plate 610 slidably disposed within the secondary air box 500, with the edge of the piston plate 610 sealingly abutting against the inner wall of the secondary air box 500. The inner cavity of the secondary air box 500 and the piston plate 610 are rectangular in shape. When the piston plate 610 moves vertically, it can discharge or draw in air from the lower side of the piston plate 610 through the connecting port 510. During this process, the folding air box 300 folds or unfolds synchronously, thereby changing, increasing, or decreasing the range of motion of the pneumatic interaction device.

[0037] A guide post 620 is integrally formed on one side of the piston plate 610 near the connecting port 510. A threaded hole 621 is formed in the middle of the guide post 620, and the threaded hole 621 passes through the end of the guide post 620 near the upper end plate 310. A lifting screw 630 is rotatably connected to the upper end plate 310. The lower end of the lifting screw 630 is located in the threaded hole 621 and is threadedly connected to the threaded hole 621. The upper end of the lifting screw 630 is located on the upper side of the upper end plate 310 and is fixedly connected to an adjusting sprocket 640.

[0038] The upper end plate 310 is also provided with a linear motion component 650 and an elastic buffer component 660. The moving end of the linear motion component 650 is connected to a first double-row sprocket 670, and the moving end of the elastic buffer component 660 is connected to a second double-row sprocket 680.

[0039] A second chain 690 connects the first double-row sprocket 670, the second double-row sprocket 680, and the adjusting sprocket 640, and the second chain 690, when connected, has a triangular shape. It can be understood that one of the sprockets of the first double-row sprocket 670 and the second double-row sprocket 680, along with the adjusting sprocket 640, is at the same horizontal level, allowing for stable operation after the second chain 690 is connected.

[0040] The first double-row sprocket 670 moves along the vertical line between the first positioning sprocket 270 and the second positioning sprocket 280. During movement, the first double-row sprocket 670 can engage or disengage from the first chain 240. At this position, the other sprocket of the first double-row sprocket 670 is at the same horizontal position as the first chain 240. Furthermore, when in contact with the first chain 240, the first double-row sprocket 670 can be rotated via the first chain 240, thereby driving the second chain 690 to rotate.

[0041] The linear motion assembly 650 includes an electric push rod 651 fixed to the upper side of the upper end plate 310. A first guide block 652 is connected to the piston of the electric push rod 651, and a double-row sprocket is rotatably connected to the upper side of the first guide block 652. A guide groove 311 is provided on the upper side of the upper end plate 310 along the vertical axis. The side of the first guide block 652 away from the first double-row sprocket 670 is slidably connected within the guide groove 311. The electric push rod 651 can drive the first double-row sprocket 670 to move along the vertical axis, thereby moving it closer to or away from the first chain 240. When the first double-row sprocket 670 approaches the first chain 240, it can engage with the first chain 240. During this process, the guide groove 311 can limit the first double-row sprocket 670, keeping it at the vertical axis position. Furthermore, the shear force on the piston end of the electric push rod 651 is relatively small during this process, improving its service life.

[0042] The elastic buffer assembly 660 includes a buffer sleeve 661 fixed to the upper side of the upper end plate 310, a buffer post 662 slidably connected inside the buffer sleeve 661, one end of the buffer sleeve 661 is closed, one end of the buffer post 662 is located inside the buffer sleeve 661, the other end extends out of the buffer sleeve 661 and is connected to a second guide block 663, and the upper side of the second guide block 663 is connected to a second double-row sprocket 680.

[0043] A baffle 664 is provided at one end of the buffer column 662 located inside the buffer sleeve 661. A compression spring 665 is provided inside the buffer sleeve 661, with one end of the compression spring 665 abutting against the baffle 664 and the other end abutting against the bottom of the buffer sleeve 661. Under the action of the compression spring 665, the buffer column 662 has elastic potential energy to move outward, thereby controlling the second double-row sprocket 680 to elastically press against the second chain 690, keeping the second chain 690 in a taut state at all times. In order to limit the buffer column 662, a limit ring 666 is threadedly connected to the open end of the buffer sleeve 661. The inner diameter of the limit ring 666 is smaller than the diameter of the baffle 664.

[0044] The upper plate 310 is provided with a secondary drive assembly 700, which is close to the second double-row sprocket 680. When the first double-row sprocket 670 is separated from the first chain 240, the secondary drive assembly 700 is connected to the second double-row sprocket 680 and can control the rotation of the second double-row sprocket 680.

[0045] Specifically, the secondary drive assembly 700 includes a second geared motor mounted on the upper side of the upper end plate 310. A third positioning sprocket 710 is connected to the output shaft of the second geared motor. A fourth positioning sprocket 720 is rotatably connected to the upper end plate 310 and located on one side of the second geared motor. A third chain 730 connects the third positioning sprocket 710 and the fourth positioning sprocket 720. When the linear motion assembly 650 controls the first double-row sprocket 670 to disengage from the first chain 240, the second double-row sprocket 680, under the action of the elastic buffer assembly 660, abuts against the third chain 730. After abutment, the third chain 730 can drive the second double-row sprocket 680 to rotate during transmission. It can be understood that one sprocket of the second double-row sprocket 680 is connected to the second chain 690, and the other sprocket can connect to the third chain 730 after movement.

[0046] For better control, a first pressure sensor 520 is installed at the bottom of the secondary air box 500, and a second pressure sensor 530 is installed at the end of the secondary air box 500 near the connecting port 510. When the piston plate 610 comes into contact with the first pressure sensor 520 or the second pressure sensor 530, the first double-row sprocket 670 disengages from the first chain 240.

[0047] This invention provides a pneumatic braking device for a bellows. When it is necessary to supply or evacuate air to change the shape of a pneumatic interactive device, the foldable bellows 300 and the drive mechanism 200 work together to supply or evacuate air to the device, thereby enabling it to perform different actions. Simultaneously, during the action demonstration, the secondary bellows 500 and the adjustment mechanism 600, located within the foldable bellows 300, can work in conjunction with the secondary bellows 500 to instantly increase the air supply and suction volume, thus allowing the pneumatic interactive device to display different actions or amplitudes of movement. This improves the exhibition effect of the pneumatic interactive device.

[0048] Secondly, when controlling the secondary air box 500, this device achieves linkage with the drive mechanism 200 through the adjustment mechanism 600, and controls the two to synchronously supply or draw air through the first geared motor 210. Furthermore, it can also achieve independent control through the second geared motor, thereby realizing reverse air supply or draw, reducing the air supply volume, or returning to the original state.

[0049] This device allows for intuitive control of the gas volume within the pneumatic interactive installation, simplifying the control of inflation and deflation speed and volume. During the exhibition and display of interactive art installations, the debugging and control of these installations are crucial. Simple operation and intuitive control reduce installation and maintenance costs, lower manpower requirements, and increase the stability and controllability of the device. Through the mutual conversion of mechanical and gas energy, it reduces the safety hazards associated with high-pressure gas storage in traditional pneumatic devices such as air compressors and vacuum machines, lowers the heat load, and facilitates the installation and long-term use of pneumatic devices in enclosed spaces.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0052] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A windbox pneumatic brake apparatus, characterized by: Includes a base (100), and a drive mechanism (200) is provided on the upper side of the base (100). A folding bellows (300) is connected to the drive mechanism (200), and the drive mechanism (200) controls the folding bellows (300) to unfold or fold. An air supply pipe (400) is fixedly installed at one end of the foldable bellows (300) away from the base (100). One end of the air supply pipe (400) is connected to the interior of the foldable bellows (300), and the other end is connected to a pneumatic interaction device. The foldable bellows (300) includes an upper end plate (310) and a foldable bladder (320); the upper end of the foldable bladder (320) is fixed and sealed to the upper end plate (310); the driving mechanism (200) drives the foldable bladder (320) to unfold or fold. The drive mechanism (200) includes a first geared motor (210) fixedly installed on the upper side of the upper end plate (310), and a drive sprocket (220) is fixedly installed on the output shaft of the first geared motor (210). Driven sprockets (230) are fixed at equal angular intervals on the circumferential side of the upper end plate (310), and the multiple driven sprockets (230) and the driving sprocket (220) are connected by a first chain (240); Multiple adjusting screws (250) are spaced apart on the circumferential side of the folding bellows (300). Each adjusting screw (250) corresponds to a driven sprocket (230). One end of each adjusting screw (250) is rotatably connected to the base (100), and the other end is fixedly connected to the driven sprocket (230). A fixing plate (260) is provided at one end of the foldable bellows (300) away from the upper end plate (310). Multiple fixing plates (260) are provided, and each corresponds to one of the adjusting screws (250). The fixing plate (260) is sleeved on the adjusting screw (250) and is threadedly connected to the adjusting screw (250).

2. A windbox pneumatic brake device according to claim 1, characterized in that: A threaded sleeve (261) is fixedly installed in the middle of the fixed plate (260). The threaded sleeve (261) is vertically installed, and the fixed plate (260) is threadedly connected to the adjusting screw (250) through the threaded sleeve (261).

3. A windbox pneumatic brake device according to claim 1, characterized in that: A first positioning sprocket (270) and a second positioning sprocket (280) are provided on the upper side of the upper end plate (310); the first chain (240) passes through the same side of the first positioning sprocket (270) and the second positioning sprocket (280) in sequence; A secondary air box (500) is suspended on the lower side of the upper end plate (310) and inside the foldable air box (300). An adjustment mechanism (600) for controlling the exhaust or suction of the secondary air box (500) is provided on the upper end plate (310).

4. A windbox pneumatic brake device according to claim 3, characterized in that: The end of the secondary bellows (500) away from the upper end plate (310) forms a communication port (510), and the communication port (510) communicates with the inner cavity of the folding bellows (300); The adjusting mechanism (600) includes a piston plate (610) slidably disposed within the secondary air box (500), the edge of the piston plate (610) sealingly abutting against the inner wall of the secondary air box (500); the inner cavity of the secondary air box (500) and the piston plate (610) are rectangular; The piston plate (610) has a guide post (620) integrally formed on one side near the communication port (510). A threaded hole (621) is formed in the middle of the guide post (620), and the threaded hole (621) passes through the end of the guide post (620) near the upper end plate (310). A lifting screw (630) is rotatably connected to the upper end plate (310). The lower end of the lifting screw (630) is located in the threaded hole (621) and is threadedly connected to the threaded hole (621). The upper end of the lifting screw (630) is located on the upper side of the upper end plate (310) and is fixedly connected to an adjusting sprocket (640). The upper end plate (310) is also provided with a linear motion component (650) and an elastic buffer component (660). The moving end of the linear motion component (650) is connected to a first double-row sprocket (670), and the moving end of the elastic buffer component (660) is connected to a second double-row sprocket (680). A second chain (690) is connected between the first double-row sprocket (670), the second double-row sprocket (680) and the adjusting sprocket (640), and the second chain (690) is triangular in shape after being connected. The first double-row sprocket (670) moves along the vertical line between the first positioning sprocket (270) and the second positioning sprocket (280). During movement, the first double-row sprocket (670) can engage or disengage with the first chain (240).

5. A windbox pneumatic brake device according to claim 4, characterized in that: The linear motion assembly (650) includes an electric push rod (651) fixed to the upper side of the upper end plate (310). The piston of the electric push rod (651) is connected to a first guide block (652), and the upper side of the first guide block (652) is rotatably connected to the first double-row sprocket (670). A guide groove (311) is provided on the upper side of the upper end plate (310) and along the vertical line direction. The first guide block (652) is slidably connected to the guide groove (311) on the side away from the first double row sprocket (670).

6. A windbox pneumatic brake apparatus according to claim 4, wherein: The elastic buffer assembly (660) includes a buffer sleeve (661) fixed to the upper side of the upper end plate (310), a buffer post (662) slidably connected inside the buffer sleeve (661), one end of the buffer sleeve (661) being closed, one end of the buffer post (662) being located inside the buffer sleeve (661), and the other end extending out of the buffer sleeve (661) and connected to a second guide block (663), the upper side of the second guide block (663) being connected to the second double-row sprocket (680); The buffer column (662) is provided with a baffle (664) at one end inside the buffer sleeve (661). A compression spring (665) is provided inside the buffer sleeve (661). One end of the compression spring (665) abuts against the baffle (664), and the other end abuts against the bottom of the buffer sleeve (661). The buffer sleeve (661) is threaded to a limiting ring (666) at one end of the opening. The inner diameter of the limiting ring (666) is smaller than the diameter of the baffle (664).

7. A windbox pneumatic brake apparatus according to claim 4, wherein: The upper end plate (310) is provided with a secondary drive assembly (700). The secondary drive assembly (700) is close to the second double row sprocket (680). When the first double row sprocket (670) is separated from the first chain (240), the secondary drive assembly (700) is connected to the second double row sprocket (680) and can control the rotation of the second double row sprocket (680).

8. A windbox pneumatic brake apparatus according to claim 7, wherein: The secondary drive assembly (700) includes a second geared motor mounted on the upper side of the upper end plate (310). A third positioning sprocket (710) is connected to the output shaft of the second geared motor, and a fourth positioning sprocket (720) is rotatably connected to the upper end plate (310) and located on one side of the second geared motor. A third chain (730) is connected between the third positioning sprocket (710) and the fourth positioning sprocket (720). When the linear motion component (650) controls the first double-row sprocket (670) to disengage from the first chain (240), the second double-row sprocket (680) abuts against the third chain (730) under the action of the elastic buffer component (660).

9. A windbox pneumatic brake apparatus according to claim 4, wherein: A first pressure sensor (520) is provided at the bottom of the secondary air box (500), and a second pressure sensor (530) is provided at one end of the secondary air box (500) near the connecting port (510). When the piston plate (610) comes into contact with the first pressure sensor (520) or the second pressure sensor (530), the first double-row sprocket (670) disengages from the first chain (240).

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