Simple support beam cloth device and construction method thereof

Abstract

The present application relates to the technical field of simply supported beam pouring technology, and particularly discloses a simply supported beam distributing device and a construction method thereof, which comprises a distributing frame, a material table, a distributing device connected to the material table and a walking assembly installed on the distributing frame, and the distributing device is used for pouring concrete; the distributing frame spans the left-right direction of the simply supported beam, and the walking assembly moves the distributing frame along the front-back direction of the simply supported beam to adjust the position of the distributing device relative to the simply supported beam. The present application uses the walking distributing frame as the carrier for pouring concrete, so that the discharging port of the distributing device can be moved, and then the concrete output by the discharging port of the distributing device can be more evenly spread on the bottom plate of the simply supported beam, thereby ensuring higher concrete pouring quality, reducing the time required for the subsequent concrete vibrating process, and improving the overall efficiency of the concrete pouring.

Description

Technical Field

[0001] This invention relates to the field of simply supported beam casting technology, specifically to a simply supported beam material placement device and its construction method. Background Technology

[0002] A simply supported beam is a single-span beam with a fixed hinge support at one end and a movable hinge support (sliding hinge support) at the other end. It is the most basic form of a statically determinate beam and is used in engineering construction (including bridge engineering). Simply supported beams are divided into several types, including straight-web simply supported beams and inclined-web simply supported beams. In a straight-web simply supported beam, the webs are vertical, and the distance between the two webs remains constant. In contrast, in an inclined-web simply supported beam, the webs are inclined, and the distance between the two webs changes with the height. Straight-web simply supported beams were more commonly used in older bridge construction projects. However, in recent years, with urban development and increasingly stringent requirements for bridge aesthetics, inclined-web simply supported beams have become more prevalent to enhance the appearance of bridges.

[0003] Whether it's a straight-web simply supported beam or an inclined-web simply supported beam, it needs to be poured after erection. Currently, pouring is done by connecting a pouring pipe to the bottom slab of the simply supported beam. The problem with using a pouring pipe is: 1. The pouring is done manually, but concrete pouring has strict requirements on layer thickness and pouring speed. Operators rely on experience to judge the layer thickness and lack accurate measurement.

[0004] 2. The relatively fixed outlet position of the pouring pipe leads to uneven concrete laying, which in turn results in a longer vibration time and lower overall construction efficiency.

[0005] 3. The pouring process lacks effective data collection methods, and key data such as pouring volume, pouring time, and layer thickness cannot be recorded and traced in real time. Summary of the Invention

[0006] The purpose of this invention is to provide a simply supported beam material placement device and its construction method to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a simply supported beam concrete placement device, including a placement frame, a material platform, a placement device connected to the material platform, and a traveling component installed on the placement frame, the placement device being used for pouring concrete; the placement frame spans the left and right directions of the simply supported beam, and the traveling component causes the placement frame to move along the front and back directions of the simply supported beam to adjust the position of the placement device relative to the simply supported beam.

[0008] Furthermore, the fabric rack is a horizontal truss, and the walking assembly consists of two drive trolleys, which are respectively installed at the bottom of the left and right ends of the horizontal truss. Each drive trolley includes a frame, which is installed at the bottom of the left or right end of the horizontal truss. Drive wheels are installed at the front and rear ends of the frame, and coaxial first driven gears are installed on the drive wheels. A first drive motor is also installed on the frame, and a first driving gear is installed on the output shaft of the first drive motor. The first driving gear is connected to the first driven gears at the front and rear ends of the frame via chains.

[0009] Furthermore, the material distributor includes a conveying pipe, which is placed at an angle. The upper end of the conveying pipe is connected to the discharge port of the material platform, and the lower end of the conveying pipe is equipped with a pouring port. An auger is installed inside the conveying pipe, and one end of the auger extends out of the conveying pipe and is connected to a second driven gear. The fabric feeder also includes a second drive motor, the output end of which is equipped with a second drive gear, which is connected to a second driven gear via a chain; It also includes a control system, which is connected to the first drive motor and the second drive motor respectively.

[0010] Furthermore, a weighing sensor is installed at the bottom of the conveying pipe, the weighing sensor is connected to a weighing system, and the weighing system is connected to the second drive motor.

[0011] Furthermore, the front and rear ends of the fabric rack are respectively equipped with compression trigger sensors, which are connected to the control system.

[0012] The present invention also provides a construction method for a simply supported beam fabric placement device, comprising the following steps: Step S1: Set up the fabric frame above the simply supported beam so that the traveling assembly is set up on top of the web plate; Step S2: Control the connection of the pouring pump pipe to the material platform to continuously deliver concrete into the material platform; Step S3: Start the walking assembly to allow the concrete placing device to continuously and evenly pour concrete onto the bottom plate of the simply supported beam.

[0013] It also includes step S4: The weighing system calculates the flow rate and volume of concrete during the pouring process based on the data from the weighing sensor and the rotational speed of the second drive motor, and records the data.

[0014] It also includes step S5: baffles are installed at the front and rear ends of the simply supported beam. When the fabric rack moves to the position of the baffle, the squeeze-type trigger sensor touches the baffle and transmits a signal to the control system. The control system controls the first drive motor to rotate in the opposite direction, so that the fabric rack moves in the opposite direction.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Using a movable concrete placing frame as the carrier for concrete pouring allows the concrete placing device's outlet to move along the simply supported beam, thereby enabling the concrete output from the outlet to be spread more evenly on the bottom plate of the simply supported beam. This ensures higher concrete pouring quality and reduces the time required for subsequent concrete vibration, thus improving the overall efficiency of concrete pouring.

[0016] 2. The weighing sensor can determine if there are any gaps in the concrete flow within the delivery pipe. This allows workers to adjust the speed of the second drive motor based on the data feedback from the weighing sensor, ensuring a continuous flow of concrete within the pipe. When the weighing sensor determines that there are no gaps in the concrete flow, the flow rate and volume of the concrete can be inferred from the rotational speed of the second drive motor. During the pouring process, layered pouring results in higher pouring quality. The height of each layer is related to the flow rate of the concrete placing boom and the moving speed of the traveling components. By inferring the flow rate and volume of concrete from the rotational speed of the second drive motor, the height of each layer can be ensured by adjusting the moving speed of the traveling components, achieving precise control during the pouring process. Attached Figure Description

[0017] Figure 1 This is a perspective view of this application.

[0018] Figure 2 This is a front view of this application.

[0019] Figure 3 This is a side view of this application.

[0020] Figure 4 This is a top view of this application.

[0021] Figure 5 for Figure 4 Enlarged view of point A.

[0022] Figure 6 This is an application diagram of the present invention.

[0023] Figure 7 This is a flowchart of the construction method of the present invention.

[0024] The meanings of the labels in the diagram are as follows: 1-Fabric rack, 2-Platform, 3-Fabricator, 31-Conveying pipe, 32-Auger, 33-Second drive motor, 34-Second driving gear, 35-Second driven gear, 4-Traveling assembly, 41-Frame, 42-First drive motor, 43-Drive wheel, 44-First driving gear, 45-First driven gear. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, so as to provide a better understanding of the concept of the present invention, the technical problem solved, the technical features constituting the technical solution, and the technical effects brought about.

[0026] like Figures 1-6 As shown, a simple-supported beam concrete placement device includes a placement frame 1, a material platform 2, a placement device 3 connected to the material platform 2, and a traveling assembly 4 mounted on the placement frame 1. The placement device 3 is used for pouring concrete. The placement frame 1 spans the left and right directions of the simple-supported beam, and the traveling assembly 4 moves the placement frame 1 along the front and back directions of the simple-supported beam to adjust the position of the placement device 3 relative to the simple-supported beam.

[0027] Using the stable-moving concrete placing frame 1 as the carrier for concrete pouring, the discharge port of the concrete placing device 3 can move smoothly, thereby allowing the concrete output from the discharge port of the concrete placing device 3 to be spread more evenly on the bottom plate of the simply supported beam, ensuring higher concrete pouring quality, and reducing the time required for subsequent concrete vibration process, thus improving the overall efficiency of concrete pouring.

[0028] Furthermore, the fabric rack 1 is a horizontal truss, and the traveling assembly 4 consists of two drive trolleys, which are respectively installed at the bottom of the left and right ends of the horizontal truss. Each drive trolley includes a frame 41, which is installed at the bottom of the left or right end of the horizontal truss. Drive wheels 43 are installed at both the front and rear ends of the frame 41, and coaxial first driven gears 45 are mounted on the drive wheels 43. A first drive motor 42 is also installed on the frame 41, and a first driving gear 44 is installed on the output shaft of the first drive motor 42. The first driving gear 44 is connected to the first driven gears 45 at the front and rear ends of the frame 41 via chains. The horizontal truss is a horizontally placed truss structure. A truss structure is formed by multiple members joined together in a triangular arrangement, appearing as a hollow frame. It has relatively high structural strength and light weight, and a large span, making it convenient to erect above simply supported beams. Furthermore, the low center of gravity of the horizontally placed truss structure ensures stability during the pouring process. The drive trolley includes a frame 41, drive wheels 43, and a first drive motor 42. The first drive motor 42 simultaneously drives the front drive wheel 43 and the rear drive wheel 43 via a chain, ensuring smooth operation of the drive trolley, minimizing swaying during concrete pouring, preventing accumulation, and thus ensuring even spreading of the concrete. This reduces the time required for subsequent concrete vibration, thereby improving the overall efficiency of concrete pouring. The left and right ends mentioned in this application are based on... Figure 3 The left and right ends shown are also the left and right ends of the side view of this application.

[0029] Furthermore, the material distributor 3 includes a conveying pipe 31, which is placed at an angle. The upper end of the conveying pipe 31 is connected to the discharge port of the material platform 2, and the lower end of the conveying pipe 31 is equipped with a pouring port. An auger 32 is installed inside the conveying pipe 31, and one end of the auger 32 extends out of the conveying pipe 31 and is connected to a second driven gear 35. The material distributor 3 also includes a second drive motor 33, and a second drive gear 34 is installed at the output end of the second drive motor 33. The second drive gear 34 is connected to the second driven gear 35 through a chain. It also includes a control system, which is connected to the first drive motor 42 and the second drive motor 33 respectively. The concrete placing device 3 includes a conveying pipe 31, an auger 32, and a second drive motor 33. The second drive motor 33 drives the auger 32 to rotate, so that the concrete pouring speed in the concrete placing device 3 is controllable. This prevents the concrete from being poured too quickly, causing the concrete to be interrupted in the conveying pipe 31 and resulting in discontinuous pouring. In this application, the pouring process is continuous, allowing the concrete to fall slowly into the simply supported beam. This avoids the problem of concrete segregation caused by excessively fast concrete conveying speed, and thus avoids excessively long subsequent vibration time.

[0030] Furthermore, a weighing sensor is installed at the bottom of the conveying pipe 31, and the weighing sensor is connected to a weighing system, which is connected to the second drive motor 33. The weighing sensor can determine whether there is a gap in the concrete within the conveying pipe 31, allowing workers to adjust the speed of the second drive motor 33 based on the data feedback from the weighing sensor, thus maintaining the continuity of concrete flow within the conveying pipe 31. When the weighing sensor determines that there is no gap in the concrete within the conveying pipe 31, the flow rate and volume of the concrete can be inferred based on the rotational speed of the second drive motor 33. During the pouring process, layered pouring results in higher pouring quality, and the height of each layer is related to the flow rate of the concrete placing device 3 and the moving speed of the traveling component 4. By inferring the flow rate and volume of concrete based on the rotational speed of the second drive motor 33, the height of each layer can be ensured by adjusting the moving speed of the traveling component 4, achieving precise control during the pouring process.

[0031] Furthermore, a compression trigger sensor is installed at the front and rear ends of the fabric rack 1, and the compression trigger sensor is connected to the control system. Baffles are installed at the front and rear ends of the simply supported beam. When the fabric rack 1 moves to the position of the baffle, the compression trigger sensor touches the baffle and transmits a signal to the control system. The control system controls the first drive motor 42 to rotate in the reverse direction, causing the fabric rack 1 to move in the reverse direction.

[0032] A construction method for a simply supported beam fabric placement device includes the following steps: Step S1: Set up the fabric frame 1 above the simply supported beam, so that the walking assembly 4 is set up on the top of the web plate; Step S2: Connect the pouring pump pipe to the material platform 2. The pump pipe continuously delivers concrete to the material platform 2 via the ground pump. The ground pump's flow rate is controlled within the range of 0.3–0.8 m³ / min to ensure a smooth flow of concrete into the hopper. Operators monitor the concrete level in the hopper in real time through observation or a level sensor. When the level reaches 80% of the hopper's capacity, the ground pump operator is promptly notified to reduce the pouring speed or stop feeding to prevent concrete overflow.

[0033] Step S3: Start the traveling assembly 4 to continuously and evenly pour concrete onto the base plate of the simply supported beam using the concrete placing boom 3. The traveling assembly 4 is controlled by a PLC, which simultaneously sends commands to the concrete placing boom 3. The traveling assembly 4 moves forward at a set speed (default 2 m / min), and the second drive motor 33 of the concrete placing boom 3 begins placing concrete at an initial speed (15 r / min). By controlling the first drive motor 42 and the second drive motor 33, the smooth movement of the concrete placing frame 1 and the smooth pouring of the concrete placing boom 3 can be controlled, resulting in less shaking during the concrete pouring process and preventing accumulation. This leads to smoother concrete spreading during pouring, reduces the time required for subsequent concrete vibration, and improves the overall efficiency of concrete pouring. The traveling assembly 4 uses encoder feedback to achieve closed-loop position control, and the traveling speed can be steplessly adjusted within the range of 0–8 m / min; the speed of the concrete placing boom 3 can be independently adjusted within the range of 50–120 r / min. The system dynamically adjusts the matching relationship between the walking speed and the concrete placement speed based on the instantaneous flow data fed back in real time by the weighing sensor, ensuring that the concrete is evenly distributed along the length of the web.

[0034] Figure 6 The hopper used in this process is a larger hopper to increase its capacity.

[0035] The process also includes step S4: The weighing system calculates the flow rate and volume of concrete during the pouring process based on the data from the weighing sensor and the rotation speed of the second drive motor 33, and records the data. This allows workers to adjust the speed of the second drive motor 33 based on the data feedback from the weighing sensor, ensuring the continuity of concrete in the delivery pipe 31. Two sets of concrete placing booms 3 correspond to the left and right webs of the box girder, respectively, and are driven and metered independently. When the instantaneous difference in the volume of concrete poured on both sides exceeds a set threshold (default 15%), the PLC automatically adjusts the rotation speed of the corresponding side's concrete placing boom 3, achieving precise control of the volume difference between the two sides.

[0036] The system uses integrated laser or ultrasonic ranging sensors to detect the surface height of the poured concrete layer in real time. When the detected value deviates from the set layer thickness (300mm±50mm), the PLC automatically fine-tunes the speed of the walking component 4 or the rotation speed of the material distributor 3 to ensure that the layer thickness meets the process requirements.

[0037] The process also includes step S5: baffles are installed at the front and rear ends of the simply supported beam. When the placing frame 1 moves to the baffle position, the compression trigger sensor touches the baffle and transmits a signal to the control system. The control system then controls the first drive motor 42 to rotate in the reverse direction, causing the placing frame 1 to move in the reverse direction. After installing the baffles and compression trigger sensors, the placing frame 1 can automatically reverse to complete the second layer of pouring after completing one layer. This application includes two modes: termination by the number of layers or termination by the cumulative volume. After reaching the set target, the placing device 3 first stops placing material, and the traveling component 4 returns to the initial position or the specified stopping position, ending the automatic pouring process.

[0038] like Figure 7 As shown, prior to step S1, construction preparation and equipment commissioning are also included: Construction preparation includes: ① Track inspection and cleaning; a comprehensive inspection of the track above the box girder formwork to ensure the track is flat, free of foreign objects and deformation, and that there are no obstacles on the track surface and sides that would affect the movement of the placing boom 1. ② Power connection and cable layout; confirming the location and voltage level of the on-site power supply, measuring the wiring distance of the equipment, laying cables in advance and reserving sufficient length to ensure that there is no entanglement or dragging of the cable reel within its travel range. ③ Visual and functional inspection of the traveling assembly 4, placing boom 3, and electrical control system to eliminate potential safety risks and ensure that all limit devices, sensors, and emergency stop buttons are in normal working order. ④ All eight fixing bolts between the placing boom shell and the equipment support must be removed before the equipment is used to allow the boom shell to be in a free state, avoiding affecting the weighing accuracy.

[0039] Equipment commissioning includes: ① Hoisting and positioning; hoisting the placing frame 1 onto the box girder template track using a lifting device, adjusting the position of the placing frame 1 to ensure that the traveling component 4 fits tightly with the track and runs smoothly. ② Power connection and voltage detection; connecting the power plug to the track power socket and checking whether the power supply voltage is stable within the range of 380V±10% before powering on. ③ System self-test and parameter zeroing. After the PLC control system is powered on, it automatically executes a self-test program to check the communication status of each subsystem, sensor signals, and actuator response, and automatically zeros and calibrates the weighing sensor. ④ Parameter setting and information entry. The operator inputs process parameters such as the target flow rate, target volume, and layer thickness; and inputs the bridge number and beam code to complete the production task binding. ⑤ Initial position adjustment; moving the placing frame 1 to the starting position of the pouring, ensuring that the buffer hopper is directly below the outlet of the ground pump pipe.

[0040] In steps S2-S5, data acquisition and management are involved, including: ① During the pouring process, the PLC collects data from the weighing sensor at a frequency of ≥1 time / second via a flow control instrument, calculating the instantaneous flow rate and cumulative volume of concrete every 10 seconds. Simultaneously, it records process parameters such as the trolley's movement position, layer thickness, and pouring time, and automatically stores the data in the touchscreen's built-in database. ② After pouring is completed, operators can observe the following through the PLC: pouring start and end times, real-time flow curve, cumulative volume statistics, trolley movement trajectory, and layer thickness records. Data can be uploaded to the beam yard construction management platform via the MES interface for quality traceability, cost accounting, and progress analysis.

[0041] Following step S5, equipment reset and cleaning are also included. ① After the operation is completed, disconnect the equipment power supply and thoroughly clean the spiral blades and inner wall of the cylinder of both placing booms 3 to remove residual concrete and prevent it from solidifying and affecting future use. ② When the equipment is not in use or before hoisting and transporting, the fixing bolts must be retightened to ensure a rigid connection between the spiral shell and the support, preventing damage to the load cells due to hoisting impact. ③ Move the placing boom 1 to a safe position at the end of the track, turn off the control system power supply, disconnect the external power plug, tidy up the cable reel, and protect the equipment. ④ Record any abnormal alarms and key component operating times from this operation in the equipment maintenance log to provide a basis for subsequent preventative maintenance.

[0042] The entire process also includes anomaly handling steps. Various abnormal situations may occur during the operation of this invention. The intelligent control system, through real-time monitoring and automatic handling mechanisms, minimizes human intervention and ensures production continuity and safety. Anomaly handling follows the basic principles of "prioritizing automatic retry, tiered intervention, and breakpoint recovery."

[0043] The abnormal handling steps include the following: ① The concrete placing device 3 automatically stops placing material and triggers an audible and visual alarm. On-site operators clear any blockages in the pipes, and after clearing, the device is reset and operation continues. ② When the weighing sensor detects that the hopper weight exceeds the limit, the system automatically stops pumping material and triggers an alarm. Overflowing concrete is manually cleared, and the device is reset. ③ When the concrete placing frame 1 reaches the end of the track and triggers the limit switch, the system automatically stops moving and triggers an alarm. The track and limit switch status are manually checked, and the device is reset. ④ When the system detects an abnormal sensor signal, it automatically triggers an alarm and switches to manual metering mode. Operators control the material placement based on experience, and maintenance personnel are notified to inspect the sensors. ⑤ The system automatically attempts to reconnect three times. If it fails, it stops, triggers an alarm, and saves the current data. The communication line is manually checked, and the system is restarted.

[0044] All anomalies are automatically recorded in the system database, forming an anomaly log for subsequent equipment optimization and process improvement. After troubleshooting, the system supports resuming production from the point of interruption, automatically picking up where work left off and avoiding repetitive tasks. Multiple standard-compliant emergency stop buttons are installed in various locations on the unit, allowing for immediate power cut-off in emergencies. During commissioning or special operating conditions, the system supports switching to manual operation mode to meet flexible operational needs.

[0045] The terms "connection" and "fixing" appearing in the description of this invention can refer to fixed connection, processing and forming, welding, or mechanical connection. The specific meaning of the above terms in this invention should be understood according to the specific circumstances.

[0046] In the description of this invention, the terms "center," "upper," "lower," "horizontal," "inner," and "outer," etc., are used only to indicate the orientation or positional relationship for the convenience of describing this invention and to simplify the description, and do not indicate or imply a specific orientation that the device or element referred to must have, and therefore should not be construed as a limitation of this invention.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A simply supported beam fabric placement device, characterized in that: It includes a concrete placing frame (1), a material platform (2), a material placing device (3) connecting the material platform (2), and a walking assembly (4) installed on the concrete placing frame (1), the material placing device (3) being used for pouring concrete; The fabric rack (1) spans the left and right directions of the simply supported beam, and the traveling component (4) moves the fabric rack (1) along the front and back directions of the simply supported beam to adjust the position of the fabric feeder (3) relative to the simply supported beam.

2. The simply supported beam fabric placement device according to claim 1, characterized in that: The fabric rack (1) is a horizontal truss, and the walking assembly (4) consists of two driving trolleys, which are respectively installed at the bottom of the left and right ends of the horizontal truss. The driving trolley includes a frame (41), which is installed at the bottom of the left or right end of the horizontal truss. The front and rear ends of the frame (41) are equipped with drive wheels (43), and the drive wheels (43) are equipped with a coaxial first driven gear (45). The frame (41) is also equipped with a first drive motor (42), and the output shaft of the first drive motor (42) is equipped with a first drive gear (44). The first drive gear (44) is connected to the first driven gear (45) at the front end and rear end of the frame (41) respectively via a chain.

3. The simply supported beam fabric placement device according to claim 2, characterized in that: The material distributor (3) includes a conveying pipe (31), which is placed at an angle. The upper end of the conveying pipe (31) is connected to the outlet of the material platform (2), and the lower end of the conveying pipe (31) is equipped with a pouring port. An auger (32) is installed inside the conveying pipe (31), and one end of the auger (32) extends out of the conveying pipe (31) and is connected to a second driven gear (35). The fabric feeder (3) also includes a second drive motor (33), and a second drive gear (34) is installed at the output end of the second drive motor (33). The second drive gear (34) is connected to the second driven gear (35) via a chain. It also includes a control system, which is connected to the first drive motor (42) and the second drive motor (33) respectively.

4. The simply supported beam fabric placement device according to claim 3, characterized in that: A weighing sensor is installed at the bottom of the conveying pipe (31), the weighing sensor is connected to a weighing system, and the weighing system is connected to the second drive motor (33).

5. A simply supported beam fabric placement device according to claim 3, characterized in that: The front and rear ends of the fabric rack (1) are respectively equipped with compression trigger sensors, which are connected to the control system.

6. A construction method for a simply supported beam concrete placing device according to any one of claims 1-5, characterized in that: Includes the following steps: Step S1: Set up the fabric frame (1) above the simply supported beam, so that the walking assembly (4) is set up on the top of the web plate; Step S2: Control the pouring pump pipe to connect to the material platform (2) and continuously deliver concrete into the material platform (2); Step S3: Start the walking component (4) to make the concrete spreader (3) continuously and evenly pour concrete onto the bottom plate of the simply supported beam.

7. The construction method of a simply supported beam concrete placing device according to claim 6, characterized in that: It also includes step S4: the weighing system calculates the flow rate and volume of concrete during the pouring process based on the data from the weighing sensor and the rotational speed of the second drive motor (33), and records the data.

8. The construction method of a simply supported beam concrete placing device according to claim 6, characterized in that: It also includes step S5: baffles are installed at the front and rear ends of the simply supported beam. When the fabric rack (1) moves to the position of the baffle, the squeeze-type trigger sensor touches the baffle and transmits a signal to the control system. The control system controls the first drive motor (42) to rotate in the opposite direction, so that the fabric rack (1) moves in the opposite direction.

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