Belt type template angle adjusting mechanism for mold spraying test device and method of belt type template angle adjusting mechanism

Abstract

The invention relates to the technical field of tunnel supporting, and discloses a belt type template angle adjusting mechanism for a mold spraying test device and a method of the belt type template angle adjusting mechanism. The technical problems that in the prior art, under the complex geological condition, the defects of a traditional supporting technology are further highlighted, so that supporting operation consumes too long time, the supporting technology is disjointed with the tunneling process, and even potential safety hazards such as surrounding rock instability are caused, and the defects that the surface of formed concrete is uneven, the edge collapses or the density is uneven are further caused are solved. The device comprises a mold spraying mechanism, and the mold spraying mechanism is installed on a bearing mechanical arm through a rotating part; the other end of the bearing mechanical arm is mounted on the rotating mechanism through a first angle adjusting structure; and a belt type template is arranged on the mold spraying mechanism. The angle between the rolling belt and the tunnel wall and the distance between the scraper and the belt are adjusted through the hydraulic cylinder, the concrete solidification effect is finally improved, and the concrete surface flatness error is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel support, in particular to a belt type formwork angle adjusting mechanism for a mold spraying test device and a method thereof. BACKGROUND

[0002] A tunnel boring machine is a highly mechanized and automated tunnel construction equipment that integrates mechanical excavation, spoil output, and initial support. Due to its high construction efficiency, good tunnel quality, and small disturbance to surrounding rock, TBM has been widely used in major underground engineering construction such as railway, highway, water tunnel, urban rail transit, and municipal comprehensive pipe gallery. Although TBM technology has made significant progress in many aspects, the support process during construction still has problems such as low efficiency, high labor intensity, and mismatch with the excavation speed, especially in poor geological sections, which has become a key bottleneck restricting the comprehensive efficiency of TBM method.

[0003] Under complex geological conditions such as soft surrounding rock, fault fracture zone, high ground stress, or water gushing, the self-stability of surrounding rock is poor, and the deformation rate is fast, which puts high requirements on the timeliness and effectiveness of the support structure. Currently, common TBM support methods include assembling prefabricated segments, spraying concrete, and steel arch support. Among them, wet spraying concrete technology is widely used due to its good adhesion and adaptability. However, traditional wet spraying concrete construction still mainly relies on manual operation or mechanical hand spraying, which has problems such as low construction efficiency, large material rebound, difficult control of spraying surface flatness, long setting time, etc. This not only causes material waste and deterioration of the construction environment, but more seriously, it leads to the inability of support operation to effectively cooperate with continuous TBM excavation, frequently causing downtime and delays in overall construction progress, increasing engineering construction cost, and even inducing surrounding rock collapse and other engineering safety accidents.

[0004] To break through this technical bottleneck, in recent years, domestic and foreign research institutions and enterprises have begun to develop a rapid support system that efficiently matches TBM. Among them, the rapid mold spraying technology is proposed as a new type of support process, the core idea of which is to constrain and shape the concrete through a movable formwork, realize the rapid spraying and preliminary solidification of the concrete, effectively improve the flatness and structural consistency of the support surface, and reduce the rebound loss. Under this background, the development of a rapid mold spraying test device for experimental research has become an important step to promote the application of this technology to engineering.

[0005] The belt-type formwork in this experimental setup is a key component for concrete molding, and its working condition directly affects the flow distribution, density, and surface quality of the concrete. Currently common fixed or simply supported formwork is difficult to adjust in real time according to different geological conditions and concrete workability, leading to defects such as unevenness, edge collapse, or uneven density on the formed concrete surface. Therefore, there is an urgent need to optimize the formwork structure, especially to design a flexible and precise angle-adjustable mechanism to adapt to different working conditions, improve concrete molding quality, and enhance the efficiency and reliability of support construction, thereby providing technical support for the safe and efficient advancement of TBMs in complex strata. Therefore, there is an urgent need to propose a belt-type formwork angle adjustment mechanism and method for a jet grouting experimental setup. Summary of the Invention

[0006] In view of the above technical problems, this disclosure provides a belt-driven template angle adjustment mechanism and method for a shotcrete test device. This solves the technical problems that arise in the prior art where, under complex geological conditions, the shortcomings of traditional support technology become increasingly apparent, leading to excessively long support operation times, disconnection from the tunneling process, and even safety hazards such as surrounding rock instability. Furthermore, it addresses the technical problems of unevenness, edge collapse, or uneven compaction of the formed concrete surface. To address the shortcomings of the prior art, the purpose of this invention is to propose a belt-driven template angle adjustment mechanism for a shotcrete test device. An electric motor drives a belt roller to rotate via a shaft, a small pulley on the transmission belt, and a large pulley on the transmission belt. Simultaneously, a hydraulic cylinder can adjust the angle between the rolling belt and the tunnel wall, and the distance between the scraper and the belt, ultimately improving the concrete's setting effect and reducing surface flatness errors.

[0007] According to one aspect of this disclosure, a belt-type template angle adjustment mechanism for a spray molding test apparatus is provided. Includes a spraying mechanism, which is mounted on a load-bearing robotic arm via a rotating component to support the spraying mechanism; The other end of the load-bearing robotic arm is mounted on the rotating mechanism via a first angle adjustment structure to control the relative position of the spraying mechanism and the working surface; The molding and spraying mechanism is equipped with an adjustable belt-type template. The belt-type template includes a frame. The frame is equipped with a shaped connecting bracket via a second angle adjustment structure. The shaped connecting bracket is mounted on a belt roller assembly. The second angle adjustment structure is used to drive the shaped connecting bracket to rotate the belt roller assembly relative to the frame, so as to adjust the angle between the rolling belt of the belt roller assembly and the working surface.

[0008] In some embodiments of this disclosure, the rotating component includes a connecting shaft and a shaft bearing sleeved on the outside of the connecting shaft.

[0009] In some embodiments of this disclosure, a shock-absorbing mechanism is provided between the load-bearing robotic arm and the molding and spraying mechanism; the shock-absorbing mechanism includes a base, which is fixedly welded to the load-bearing robotic arm, and a base shaft is rotatably mounted on the base. The base shaft is connected to a spring base to mount a spring, and the other end of the spring is mounted on the molding and spraying mechanism via the shaft.

[0010] In some embodiments of this disclosure, the rotating mechanism includes a rotating gear, which is mounted with a hydraulic motor to drive the rotating gear to rotate.

[0011] In some embodiments of this disclosure, the belt-driven template includes an electric motor. The electric motor is equipped with a transmission direction converter via an axial flexible coupling to convert vertical transmission into horizontal rotation. A transmission shaft is installed at the end of the transmission direction converter via a radial flexible coupling. A small pulley is connected to the end of the transmission shaft. A large pulley is installed on the small pulley via a transmission belt. A large belt roller is installed at the center of the large pulley via a central rotating shaft. A small belt roller is installed on the large belt roller via a rolling belt. A non-circular connecting bracket is also installed on the large pulley via a bearing. A roller shaft is installed on the small belt roller via a roller bearing. The roller shaft is mounted on the non-circular connecting bracket.

[0012] In some embodiments of this disclosure, the end of the rolling belt is mounted on a belt shaft fixing bracket via a belt shaft bearing.

[0013] In some embodiments of this disclosure, the irregular connecting bracket is provided with through holes for mounting the piston end of the belt hydraulic cylinder. The other end of the belt hydraulic cylinder is fixedly mounted on the frame of the molding and spraying mechanism. The angle between the rolling belt and the tunnel wall is controlled by adjusting the extension and retraction of the belt hydraulic cylinder.

[0014] In some embodiments of this disclosure, scraper brackets are symmetrically mounted on both ends of the frame of the spraying mechanism via scraper hydraulic cylinders. A scraper is mounted in the middle of the scraper bracket via a scraper drive shaft. The scraper drive shaft is mounted on the drive shaft via a fixing nut. By controlling the extension and retraction of the scraper hydraulic cylinders, the distance between the scraper and the rolling belt is controlled to scrape off the concrete adhering to the surface of the belt.

[0015] In some embodiments of this disclosure, a protective shell is installed on the outer side of the drive belt.

[0016] According to another aspect of this disclosure, a method for adjusting the angle of a belt-driven template in a spray molding test apparatus is provided, applicable to the aforementioned belt-driven template angle adjustment mechanism in a spray molding test apparatus, comprising the following steps: (1) Coarse position adjustment: Control the movement of the first angle adjustment structure to drive the load-bearing robotic arm to move the spraying mechanism and the belt-type template on it to the preset working area close to the tunnel wall; (2) Angle fine adjustment: control the action of the second angle adjustment structure to drive the irregular connecting bracket to rotate around its rotation axis, thereby driving the belt roller assembly and the rolling belt on it to deflect synchronously; detect the angle between the rolling belt and the tunnel wall surface in real time until the angle reaches the preset target value; (3) Molding test: Start the motor, and the power is transmitted to the small pulley in sequence through the axial flexible coupling, the transmission direction converter, the radial flexible coupling, and the transmission shaft; the small pulley drives the large pulley to rotate through the transmission belt, which in turn drives the large belt drum and the rolling belt to run, and the molding test is carried out; during this process, the shock absorption mechanism continuously absorbs and buffers the generated vibration; (4) Cleaning and maintenance: During work breaks or after completion, control the action of the scraper hydraulic cylinder to push the scraper bracket and scraper close to the surface of the rolling belt to scrape off the concrete residue adhering to its surface.

[0017] The beneficial effects of this invention are as follows: This invention improves the setting effect of concrete and reduces the surface flatness error of concrete by adjusting the angle between the rolling belt and the tunnel wall and the distance between the scraper and the belt using a hydraulic cylinder.

[0018] The rotating component forms the core connection point between the spraying mechanism and the load-bearing robotic arm. Its built-in pivot bearings ensure low-resistance, smooth rotation of the spraying mechanism in the horizontal plane, providing the necessary degrees of freedom for initial coarse posture adjustments. This not only reduces the driving force required for movement and decreases the motor load, but also avoids structural stress concentration that might result from rigid connections, improving the flexibility and lifespan of the entire robotic arm system.

[0019] As the main load-bearing component, the heavy-duty robotic arm's high-strength design ensures stable suspension and reliable support for the entire spraying mechanism in harsh construction environments. Combined with the first angle adjustment structure, it enables large-scale and rapid coarse spatial positioning adjustments of the spraying mechanism. This allows the device to quickly adapt to the constantly changing working face distance after tunnel excavation, significantly shortening the preparation time before support work and is a key factor in improving the efficiency of the TBM excavation-support cycle.

[0020] The hydraulic motor-driven rotary gear system provides stable and powerful rotational torque. It allows the entire robotic arm to rotate 360°, significantly expanding the operational coverage of the molding and spraying unit. It also enables flexible and rapid relocation to new work areas, enhancing the equipment's adaptability and mobility in narrow, complex tunnel spaces.

[0021] The shock absorption mechanism serves as a buffer connection between the load-bearing robotic arm and the die-casting mechanism. It effectively absorbs high-frequency vibrations and impacts from two sources: vibrations generated by the die-casting mechanism's own motor and belt rollers, and minor disturbances that may be transmitted from the surrounding rock of the tunnel. Through the energy dissipation of spring deformation, it significantly reduces vibration transmission and protects the angle adjustment mechanism.

[0022] The second angle adjustment structure is the core of achieving precise angle fine-tuning. By controlling the extension and retraction of the belt hydraulic cylinder, the irregularly shaped connecting bracket is driven to rotate precisely around its axis, thereby causing the entire belt roller assembly to deflect. This allows for fine adjustment of the angle between the template and the working surface after the molding and spraying mechanism is largely in place. This ensures that the concrete is sprayed at the optimal angle and adheres to the tunnel wall, solving the problem of large surface flatness errors and optimizing the concrete's density and setting effect.

[0023] Flexible couplings effectively compensate for minor coaxiality errors between the motor and the drive shaft, have a larger installation tolerance, reduce wear and vibration, and improve transmission smoothness and component life.

[0024] The transmission direction converter changes the power transmission direction from vertical to horizontal, resolving the spatial contradiction between the motor layout and the axial requirements of the belt drum, making the overall structure more compact and reasonable.

[0025] Multi-stage belt drives have inherent overload protection capabilities, smooth transmission process, low noise, and can achieve certain speed adjustment functions by selecting different pulley diameters to adapt to the belt speed requirements of different working conditions.

[0026] The scraper provides automated self-cleaning capabilities. By controlling the gap between the scraper and the rolling belt surface through a hydraulic cylinder, it can automatically and efficiently remove hardened concrete residue adhering to the belt without stopping the machine or during work breaks. This solves problems such as belt misalignment and reduced surface quality caused by concrete adhesion, ensuring the continuity and stability of the molding and spraying operation, and significantly reducing the intensity and safety risks of manual cleaning.

[0027] The protective shell is installed on the outside of the drive belt, serving a dual purpose of safety protection and dust and splash prevention. Firstly, it prevents operators or tools from accidentally contacting high-speed moving parts, complying with safety production regulations; secondly, it prevents concrete slurry or debris from the tunnel from entering the transmission system, avoiding jamming, accelerated wear, or transmission failure, and ensuring the reliability of the transmission. Attached Figure Description

[0028] Fig. 1 This is a schematic diagram of the belt-type template angle adjustment mechanism used in the mold spraying test device; Fig. 2 A schematic diagram of the shock absorption mechanism of the belt-type template angle adjustment mechanism used in the mold spraying test device; Fig. 3 A schematic diagram of the belt-type template structure used in the mold spraying test device for adjusting the angle of the belt-type template. Fig. 4 A front view of the belt-type template used in the mold spraying test apparatus for adjusting the angle of the belt-type template. The components in the diagram are named as follows: 1. Molding and spraying mechanism; 2. Load-bearing robotic arm; 3. First angle adjustment structure; 4. Rotary gear; 5. Hydraulic motor; 11. Base; 12. Base pivot; 13. Spring base; 14. Spring; 15. Pivot; 16. Connecting pivot; 17. Pivot bearing; 21. Small pulley; 22. Frame; 23. Protective housing; 24. Large pulley; 25. Central shaft; 26. Large belt drum; 27. Rolling belt; 28. Small belt drum; 29. ​​Drum bearing; 30. Drum shaft; 31. Irregular connecting bracket; 32. Scraper hanger; 33. Scraper hydraulic cylinder; 34. Belt hydraulic cylinder; 41. Belt shaft bearing; 42. Belt shaft fixing bracket; 43. Scraper drive shaft; 44. Drive direction converter; 45. Axial flexible coupling; 46. Electric motor; 47. Radial flexible coupling; 48. Drive shaft; 49. Scraper; 50. Fixing nut. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1

[0030] This example discloses a belt-type template angle adjustment mechanism for a spray molding test apparatus. See [link to relevant documentation]. Figs. 1 to 4 It includes a spraying mechanism 1, which is mounted on a load-bearing mechanical arm 2 via a rotating component to support the spraying mechanism 1. The other end of the load-bearing robotic arm 2 is mounted on the rotating mechanism via the first angle adjustment structure 3 to control the relative position of the molding and spraying mechanism 1 and the working surface; The molding and spraying mechanism 1 is equipped with an adjustable belt template. The belt template includes a frame 22. The frame 22 is equipped with a shaped connecting bracket 31 via a second angle adjustment structure. The shaped connecting bracket 31 is mounted on the belt roller assembly. The second angle adjustment structure is used to drive the shaped connecting bracket 31 to rotate the belt roller assembly relative to the frame 22, so as to adjust the angle between the rolling belt of the belt roller assembly and the working surface.

[0031] The first angle adjustment structure is a hydraulic cylinder.

[0032] The rotating component includes a connecting shaft 16 and a shaft bearing 17 sleeved on the outside of the connecting shaft 16.

[0033] A shock-absorbing mechanism is provided between the load-bearing robotic arm 2 and the molding and spraying mechanism 1. The shock-absorbing mechanism includes a base 11, which is fixedly welded to the load-bearing robotic arm 2. The base 11 is rotatably mounted with a base shaft 12. The base shaft 12 is connected to a spring base 13 to mount a spring 14. The other end of the spring 14 is mounted on the molding and spraying mechanism 1 via a shaft 15.

[0034] The rotating mechanism includes a rotating gear 4, which is equipped with a hydraulic motor 5 to drive the rotating gear 4 to rotate.

[0035] The belt-driven template includes a motor 46. The motor 46 is connected to a transmission direction converter 44 via an axial flexible coupling 45 to convert vertical transmission to horizontal rotation. The transmission direction converter 44 is connected to a transmission shaft 48 via a radial flexible coupling 47. The transmission shaft 48 is connected to a small pulley 21. The small pulley 21 is connected to a large pulley 24 via a transmission belt. The center of the large pulley 24 is connected to a large belt roller 26 via a central rotating shaft 25. The large belt roller 26 is connected to a small belt roller 28 via a rolling belt 27. The large pulley 24 is also connected to a non-circular connecting bracket 31 via a bearing. The small belt roller 28 is connected to a roller shaft 30 via a roller bearing 29. The roller shaft 30 is mounted on the non-circular connecting bracket 31.

[0036] The end of the rolling belt 27 is mounted on the belt shaft fixing bracket 42 via the belt shaft bearing 41.

[0037] The irregular connecting bracket 31 is provided with a through hole for installing the piston end of the belt hydraulic cylinder 34. The other end of the belt hydraulic cylinder 34 is fixedly installed on the frame 22 of the molding and spraying mechanism 1. The angle between the rolling belt 27 and the tunnel wall is controlled by adjusting the extension and retraction of the belt hydraulic cylinder 34.

[0038] The second angle adjustment structure is a belt-driven hydraulic cylinder 34.

[0039] The frame 22 of the spraying mechanism 1 is symmetrically equipped with scraper brackets 32 at both ends via scraper hydraulic cylinders 33. The scraper 49 is installed in the middle of the scraper brackets 32 via scraper drive shaft 43. The scraper drive shaft 43 is installed on the drive shaft 48 via fixing nuts 50. By controlling the extension and retraction of the scraper hydraulic cylinders 33, the distance between the scraper 49 and the rolling belt 27 is controlled to scrape off the concrete adhering to the belt surface.

[0040] A protective cover 23 is installed on the outside of the transmission belt.

[0041] A method for adjusting the angle of a belt-driven template in a spray molding test apparatus, applicable to the aforementioned belt-driven template angle adjustment mechanism in a spray molding test apparatus, includes the following steps: (1) Coarse position adjustment: Control the action of the first angle adjustment structure 3 to drive the load-bearing mechanical arm 2 to move the molding spraying mechanism 1 and the belt-type template on it to the preset working area close to the tunnel wall; (2) Angle fine adjustment: control the action of the belt hydraulic cylinder 34 to drive the irregular connecting bracket 31 to rotate around its rotation axis, thereby driving the belt roller assembly and the rolling belt 27 on it to deflect synchronously; detect the angle between the rolling belt 27 and the tunnel wall surface in real time until the angle reaches the preset target value; (3) Molding test: Start the motor 46, and the power is transmitted to the small pulley 21 through the axial flexible coupling 45, the transmission direction converter 44, the radial flexible coupling 47, and the transmission shaft 48 in sequence; the small pulley 21 drives the large pulley 24 to rotate through the transmission belt, which in turn drives the belt roller 26 and the rolling belt 27 to run, and carry out the molding test; during this process, the shock absorption mechanism continuously absorbs and buffers the generated vibration; (4) Cleaning and maintenance: During work breaks or after completion, control the action of the scraper hydraulic cylinder 33 to push the scraper bracket 32 ​​and scraper 49 close to the surface of the rolling belt 27 to scrape off the concrete residue adhering to its surface.

[0042] Although some preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0043] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A belt-type template angle adjustment mechanism for a mold spraying test apparatus, characterized in that: Includes a spraying mechanism, which is mounted on a load-bearing robotic arm via a rotating component to support the spraying mechanism; The other end of the load-bearing robotic arm is mounted on the rotating mechanism via a first angle adjustment structure to control the relative position of the spraying mechanism and the working surface; The molding and spraying mechanism is equipped with an adjustable belt-type template. The belt-type template includes a frame. The frame is equipped with a shaped connecting bracket via a second angle adjustment structure. The shaped connecting bracket is mounted on a belt roller assembly. The second angle adjustment structure is used to drive the shaped connecting bracket to rotate the belt roller assembly relative to the frame, so as to adjust the angle between the rolling belt of the belt roller assembly and the working surface.

2. The belt-type template angle adjustment mechanism for the spray molding test apparatus as described in claim 1, characterized in that: The rotating component includes a connecting shaft and a shaft bearing sleeved on the outside of the connecting shaft.

3. The belt-type template angle adjustment mechanism for the mold spraying test apparatus as described in claim 1, characterized in that: A shock-absorbing mechanism is provided between the load-bearing robotic arm and the molding and spraying mechanism; the shock-absorbing mechanism includes a base, which is fixedly welded to the load-bearing robotic arm, and a base shaft is rotatably mounted on the base. The base shaft is connected to a spring base to install a spring, and the other end of the spring is mounted on the molding and spraying mechanism via the shaft.

4. The belt-type template angle adjustment mechanism for a spray molding test apparatus as described in claim 1, characterized in that: The rotating mechanism includes a rotating gear, which is equipped with a hydraulic motor to drive the rotating gear to rotate.

5. The belt-type template angle adjustment mechanism for a mold spraying test apparatus as described in claim 1, characterized in that: The belt-driven template includes an electric motor. The electric motor is equipped with a transmission direction converter via an axial flexible coupling to convert vertical transmission into horizontal rotation. The transmission direction converter is equipped with a transmission shaft via a radial flexible coupling at its end. The transmission shaft is connected to a small pulley at its end. The small pulley is equipped with a large pulley via a transmission belt. The center of the large pulley is equipped with a large belt roller via a central rotating shaft. The large belt roller is equipped with a small belt roller via a rolling belt. The large pulley is also equipped with a non-circular connecting bracket via a bearing. The small belt roller is equipped with a roller shaft via a roller bearing. The roller shaft is mounted on the non-circular connecting bracket.

6. The belt-type template angle adjustment mechanism for a spray molding test apparatus as described in claim 5, characterized in that: The irregular connecting bracket is provided with through holes to install the piston end of the belt hydraulic cylinder. The other end of the belt hydraulic cylinder is fixedly installed on the frame of the molding and spraying mechanism. The angle between the rolling belt and the tunnel wall is controlled by adjusting the extension and retraction of the belt hydraulic cylinder.

7. The belt-type template angle adjustment mechanism for a mold spraying test apparatus as described in claim 5, characterized in that: The frame of the molding and spraying mechanism has scraper brackets symmetrically installed at both ends via scraper hydraulic cylinders. The scraper is installed in the middle of the scraper bracket via a scraper drive shaft. The scraper drive shaft is installed on the drive shaft via a fixing nut. By controlling the extension and retraction of the scraper hydraulic cylinder, the distance between the scraper and the rolling belt is controlled to scrape off the concrete adhering to the surface of the belt.

8. The belt-type template angle adjustment mechanism for a spray molding test apparatus as described in claim 5, characterized in that: A protective shell is installed on the outside of the transmission belt.

9. A method for adjusting the angle of a belt-driven template in a spray molding test apparatus, applicable to the belt-driven template angle adjustment mechanism for a spray molding test apparatus as described in any one of claims 1 to 8, characterized in that, Includes the following steps: (1) Coarse position adjustment: Control the movement of the first angle adjustment structure to drive the load-bearing robotic arm to move the spraying mechanism and the belt-type template on it to the preset working area close to the tunnel wall; (2) Angle fine adjustment: control the action of the second angle adjustment structure to drive the irregular connecting bracket to rotate around its rotation axis, thereby driving the belt roller assembly and the rolling belt on it to deflect synchronously; detect the angle between the rolling belt and the tunnel wall surface in real time until the angle reaches the preset target value; (3) Molding test: Start the motor, and the power is transmitted to the small pulley in sequence through the axial flexible coupling, the transmission direction converter, the radial flexible coupling, and the transmission shaft; the small pulley drives the large pulley to rotate through the transmission belt, which in turn drives the large belt drum and the rolling belt to run, and the molding test is carried out; during this process, the shock absorption mechanism continuously absorbs and buffers the generated vibration; (4) Cleaning and maintenance: During work breaks or after completion, control the action of the scraper hydraulic cylinder to push the scraper bracket and scraper close to the surface of the rolling belt to scrape off the concrete residue adhering to its surface.

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