Belt system with self-tensioning function

Abstract

This invention provides a belt system with built-in tensioning function, belonging to the field of mechanical transmission technology. It includes: a belt drive mechanism consisting of a mounting frame, a servo motor, a driving roller, a drive belt, and a driven roller; and an integrated tension detection mechanism including a fixed plate, a lifting block, a tension shaft, a tension roller, a rotating rod, a centrifugal assembly, an L-shaped drive plate, a slippage indicator assembly, a lifting adjustment assembly, and a protective shell. The centrifugal assembly converts the rotational speed of the tension roller into the axial displacement of the movable ring, which drives a pointer to swing on a dial via the L-shaped drive plate, rack, and sector toothed plate. The dial has three areas: stationary, normal speed, and slippage warning. The pointer position corresponds in real time to the belt's stationary, rated operation, low-speed operation, and slippage state. This invention solves the problem that existing tensioning devices cannot intuitively indicate belt slippage without relying on electronic sensors, achieving purely mechanical slippage detection and alarm, with a compact structure and high reliability.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and in particular to a belt system with built-in tensioning function. Background Technology

[0002] In various mechanical transmission systems, annular belts are widely used due to their simple structure and low cost. To ensure the transmission efficiency and lifespan of the belt, a tensioning device is usually required to adjust the initial tension of the belt. Existing tensioning devices are mainly divided into fixed types (such as screw sliding type) and automatic types (such as spring or elastic body tensioners). Although they can maintain the static tension of the belt within a certain range, they all share a common drawback: they cannot detect the dynamic slippage of the belt during operation in real time. When the belt slips due to wear, oil contamination, overload, or insufficient initial tension, the actual linear speed of the belt will be lower than the linear speed of the drive wheel, resulting in decreased transmission efficiency, increased energy consumption, rapid overheating of the belt, and even breakage. However, operators or maintenance systems often cannot detect this situation in time and can only make judgments by stopping the machine for inspection or relying on experience, which seriously affects the reliability and economy of the equipment.

[0003] Furthermore, while some existing high-end transmission systems can monitor belt speed using external speed sensors (such as photoelectric encoders or magnetoelectric sensors), these electronic or photoelectric devices are costly, require power supplies, and are susceptible to interference from dust, oil, and vibration, resulting in poor reliability under harsh operating conditions. Additionally, the tensioner and speed monitoring device are independent of each other, occupying a large space and requiring complex installation. Therefore, how to achieve real-time mechanical indication of belt slippage using the tensioner's own structure without adding electronic components or relying on an external power supply has become a pressing technical problem in this field. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is to provide real-time and intuitive indication of belt slippage without relying on electronic sensors and external power supply.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a belt system with built-in tensioning function, comprising: A belt drive mechanism includes a mounting frame. A servo motor is fixedly mounted on the upper side of the rear end of the mounting frame. The output shaft of the servo motor is driven by a drive roller via a coupling. The drive roller is rotatably connected to the front side of the mounting frame. A drive belt is driven by the outer surface of the drive roller, and a driven roller is driven by the inner side of the lower left side of the drive belt. An integrated tension detection mechanism includes a fixed plate fixedly mounted on the back of a mounting frame. A lifting groove is provided on the front side of the fixed plate. A lifting block is slidably connected to the front side of the lifting groove. A tensioning shaft is rotatably connected to the center of the lifting block. A tensioning roller is fixedly connected to the front end of the tensioning shaft, and the tensioning roller is driven to the lower right side of the inner side of the transmission belt. A rotating rod is fixedly connected to the rear end of the tensioning shaft. The rear end of the rotating rod passes through the lifting groove and extends to the rear side of the fixed plate, and is driven to a centrifugal assembly. The centrifugal assembly includes a movable ring slidably fitted onto the outer surface of the rotating rod. An L-shaped drive plate is rotatably connected to the outer surface of the movable ring. A slippage indicator assembly is driven to the bottom end of the L-shaped drive plate. A lifting adjustment assembly is also installed at the rear end of the fixed plate, and the lifting adjustment assembly is driven to the lifting block.

[0008] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, a through groove is provided on the lower right side of the mounting frame, and the front end of the lifting block is slidably connected in the through groove.

[0009] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, the lifting adjustment component includes a threaded rod rotatably connected to the left side of the fixed plate, a lifting rod is threadedly connected to the outer surface of the threaded rod, and the right end of the lifting rod is fixedly connected to the rear wall of the lifting block, and a knob is fixedly connected to the bottom end of the threaded rod.

[0010] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, the rotating rod, centrifugal component and slippage indicator component are externally fitted with a protective shell, the middle part of the lifting rod passes through the shell of the protective shell, one end of the lifting rod is fixedly connected to the lifting block located inside the protective shell, and the other end of the lifting rod is threadedly connected to the threaded rod located outside the protective shell.

[0011] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, the centrifugal assembly further includes a fixed ring fixedly installed on the outer surface of the front end of the rotating rod. The fixed ring is elastically connected to the movable ring at the rear end through a telescopic spring. Centrifugal rods are hinged to both sides of the fixed ring, and centrifugal balls are fixedly installed at the tail ends of the two centrifugal rods. Pull rods are hinged to both sides of the movable ring, and hinge sleeves are hinged to the front ends of the two pull rods. The two hinge sleeves are respectively fixedly installed on the outer surfaces of the two centrifugal rods.

[0012] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, a limiting straight groove is formed inside the protective shell and directly below the movable ring, and the bottom of the L-shaped drive plate is slidably connected in the limiting straight groove, the top of the L-shaped drive plate is sleeved on the outer surface of the movable ring, and the movable ring is rotatably connected to the rotating rod and the L-shaped drive plate.

[0013] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, the slippage indicator component includes a rotating shaft rotatably connected to the bottom of the inner end of the protective shell, a fan-shaped toothed plate fixedly installed on the outer surface of the rotating shaft, a pointer fixedly installed at the bottom end of the fan-shaped toothed plate, and the slippage indicator component further includes a scale plate fixedly installed on the bottom wall of the outer side of the protective shell, the bottom end of the pointer penetrating the bottom wall of the inner side of the protective shell and extending to the scale mark of the scale plate.

[0014] In a preferred embodiment of the belt system with built-in tensioning function described in this invention, a rack adapted to the fan-shaped toothed plate is fixedly installed at the bottom of the L-shaped drive plate, and the bottom of the L-shaped drive plate is connected to the fan-shaped toothed plate through the rack.

[0015] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, the dial is provided with a stationary scale area, a normal speed scale area, and a slippage warning scale area in sequence along the swing direction of the pointer; when the transmission belt is stationary, the centrifugal component is in its initial state, and the pointer points to the foremost end of the stationary scale area; when the transmission belt is running normally at its rated speed without slippage, the pointer points to the last end of the normal speed scale area; when the transmission belt is running but the speed is lower than the rated value, the pointer points to the front area of ​​the normal speed scale area; when the transmission belt slips, the pointer points to the slippage warning scale area.

[0016] As a preferred embodiment of the belt system with built-in tensioning function described in this invention, two lifting rods are symmetrically arranged vertically, and the protective shell is sleeved on the two lifting rods.

[0017] The beneficial effects of this invention are as follows: By integrating the tensioning function with the slippage detection function, this invention utilizes a centrifugal component to convert the real-time rotational speed of the tensioning roller into the axial displacement of the moving ring. This displacement is then transmitted via an L-shaped drive plate, rack, and sector toothed plate to drive a pointer to swing on a dial, achieving purely mechanical slippage detection and alarm. It requires no electronic sensors or external power supply, resulting in a compact structure and low cost. The dial has three zones: stationary, normal speed, and slippage warning. The operator can intuitively judge the belt's operating status: the pointer is at zero when stationary, points to the end of the normal zone at rated speed, points forward when the speed is low, and jumps into the warning zone when slippage occurs, thus promptly detecting belt slack, overload, or slippage faults. This solution is particularly suitable for harsh working conditions such as dust, oil, and humidity. It offers high reliability, requires no maintenance, effectively solves the technical problem of existing tensioning devices being unable to detect slippage in real time, and significantly improves the safety and service life of the transmission system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a three-dimensional front view of the overall structure of the present invention; Figure 2 This is a three-dimensional rear view of the overall structure of the present invention; Figure 3 This is a perspective view of the belt drive mechanism of the present invention; Figure 4 This is a perspective view of the integrated tension detection mechanism of the present invention; Figure 5 This is a three-dimensional side sectional view of the integrated tension detection mechanism of the present invention; Figure 6 This is a three-dimensional top sectional view of the integrated tension detection mechanism of the present invention; Figure 7 This is a three-dimensional enlarged view of the internal structure of the protective shell of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Example

[0023] Reference Figures 1-7 This embodiment provides a belt system with built-in tensioning function, including a belt drive mechanism 100 and an integrated tension detection mechanism 200. The belt drive mechanism 100 is used for power transmission, and its specific structure is as follows: a mounting frame 101 is provided, which serves as the supporting skeleton of the entire system; a servo motor 102 is fixedly mounted on the upper side of the rear end of the mounting frame 101; the output shaft of the servo motor 102 is driven by a drive roller 103 via a coupling, and the drive roller 103 is rotatably connected to the front side of the mounting frame 101, thereby transmitting the motor torque to the drive roller; a drive belt 104 is driven by the outer surface of the drive roller 103, and a driven roller 105 is driven by the inner side of the lower left side of the drive belt 104. When the servo motor 102 is started, the drive roller 103 rotates and drives the drive belt 104, which in turn drives the driven roller 105 to rotate, completing the basic belt drive function.

[0024] The integrated tension detection mechanism 200 performs both tension adjustment and slippage detection tasks. This mechanism includes a fixed plate 201 fixedly mounted on the back of the mounting frame 101, serving as a mounting base for subsequent components. A vertical lifting groove 201a is formed on the front side of the fixed plate 201. A lifting block 202 is slidably connected to the front side of the lifting groove 201a, allowing the lifting block 202 to slide up and down along the lifting groove 201a, thereby changing the height position of the tension roller. A tensioning shaft 203 is rotatably connected to the center of the lifting block 202. A tensioning roller 204 is fixedly connected to the front end of the tensioning shaft 203, and is drivenly connected to the lower right side of the inner side of the transmission belt 104 to apply controllable tension to the transmission belt. A rotating rod 205 is fixedly connected to the rear end of the tensioning shaft 203. The rear end of the rotating rod 205 passes through the lifting groove 201a and extends to the rear side of the fixed plate 201, and is drivenly connected to a centrifugal assembly 206. The core function of the centrifugal assembly 206 is to convert the rotational speed of the tension roller into centrifugal force, thereby driving the slippage indicator assembly 207. Specifically, the centrifugal assembly 206 includes a movable ring 206a slidably sleeved on the outer surface of the rotating rod 205. An L-shaped drive plate 206b is rotatably connected to the outer surface of the movable ring 206a, and the slippage indicator assembly 207 is drive-connected to the bottom end of the L-shaped drive plate 206b. In addition, a lifting adjustment assembly 208 is installed at the rear end of the fixed plate 201. This lifting adjustment assembly 208 is drive-connected to the lifting block 202 and is used to manually adjust the vertical position of the tension roller, thereby changing the initial tension of the belt.

[0025] To ensure the stability of the lifting block 202 during sliding, a through groove 101a is provided on the lower right side of the mounting frame 101. The front end of the lifting block 202 is slidably connected in the through groove 101a. The through groove 101a and the lifting groove 201a together provide double guidance for the lifting block, preventing it from deflecting or getting stuck. The specific structure of the lifting adjustment component 208 is as follows: it includes a threaded rod 208a rotatably connected to the left side of the fixed plate 201. A lifting rod 208b is threadedly connected to the outer surface of the threaded rod 208a, and the right end of the lifting rod 208b is fixedly connected to the rear wall of the lifting block 202. A knob 208c is fixedly connected to the bottom end of the threaded rod 208a. When the operator rotates the knob 208c, the threaded rod 208a rotates, driving the lifting rod 208b to move up and down through the threaded pair, thereby driving the lifting block 202 and the tension roller 204 to rise and fall, realizing coarse adjustment of the tension.

[0026] To protect the internal precision components from external environmental factors such as dust and oil, a protective shell 209 is fitted over the rotating rod 205, the centrifugal assembly 206, and the slippage indicator assembly 207. The middle of the lifting rod 208b penetrates the shell of the protective shell 209. One end of the lifting rod 208b is fixedly connected to the lifting block 202 located inside the protective shell 209, and the other end is threadedly connected to a threaded rod 208a located outside the protective shell 209. In this way, the protective shell neither interferes with the tension adjustment transmission nor obstructs the centrifugal assembly and indicator assembly.

[0027] The internal linkage of the centrifugal assembly 206 is as follows: It also includes a fixed ring 206c fixedly installed on the outer surface of the front end of the rotating rod 205. The fixed ring 206c is elastically connected to the movable ring 206a at the rear end through a telescopic spring 206d. The telescopic spring 206d always pushes the movable ring 206a towards the rear end. Centrifugal rods 206e are hinged to both sides of the fixed ring 206c, and centrifugal balls 206f are fixedly installed at the tail of the two centrifugal rods 206e. Pull rods 206g are hinged to both sides of the movable ring 206a, and hinge sleeves 206h are hinged to the front ends of the two pull rods 206g. The two hinge sleeves 206h are respectively fixedly installed on the outer surface of the two centrifugal rods 206e. When the tension roller 204 rotates with the drive belt 104, the rotating rod 205 drives the fixed ring 206c to rotate. The centrifugal ball 206f opens outward under the action of centrifugal force. Through the linkage of the centrifugal rod 206e and the pull rod 206g, it pushes the movable ring 206a to slide forward against the elastic force of the telescopic spring 206d. The higher the speed of the drive belt, the greater the centrifugal force, and the greater the distance the movable ring 206a moves backward. Conversely, when the belt slips and the speed of the tension roller decreases, the centrifugal force decreases, and the movable ring 206a returns to its original position under the action of the spring.

[0028] A limiting groove 209a is formed inside the protective shell 209 and directly below the movable ring 206a. The bottom of the L-shaped drive plate 206b is slidably connected within this limiting groove 209a, ensuring that the L-shaped drive plate can only move linearly in the front-back direction without swaying. The top of the L-shaped drive plate 206b is fitted onto the outer surface of the movable ring 206a, and the movable ring 206a is rotatably connected to both the rotating rod 205 and the L-shaped drive plate 206b—that is, the movable ring 206a can both rotate with the rotating rod 205 (through bearings or sliding fit) and slide axially on the rotating rod 205, simultaneously driving the L-shaped drive plate 206b to move axially. In this way, the axial displacement of the movable ring 206a is precisely transmitted to the L-shaped drive plate 206b.

[0029] The slip indication component 207 is used to convert the linear motion of the L-shaped drive plate into the swing of a pointer, which is then displayed on a dial. Its specific structure includes: a rotating shaft 207a rotatably connected to the bottom of the inner part of the protective housing 209; a fan-shaped toothed plate 207b is fixedly mounted on the outer surface of the rotating shaft 207a; a pointer 207c is fixedly mounted at the bottom end of the fan-shaped toothed plate 207b; the slip indication component 207 also includes a dial 207d fixedly mounted on the outer bottom wall of the protective housing 209; the bottom end of the pointer 207c penetrates the inner bottom wall of the protective housing 209 and extends to the scale markings on the dial 207d. A rack 206i adapted to the fan-shaped toothed plate 207b is fixedly mounted on the bottom of the L-shaped drive plate 206b; the bottom of the L-shaped drive plate 206b is engaged with the fan-shaped toothed plate 207b via the rack 206i. When the movable ring 206a drives the L-shaped drive plate 206b to move back and forth, the rack 206i drives the sector toothed plate 207b to swing around the rotating shaft 207a, thereby causing the pointer 207c to indicate different positions on the dial 207d.

[0030] The dial 207d has three zones arranged sequentially along the swing direction of the pointer 207c: a stationary scale zone, a normal speed scale zone, and a slippage warning scale zone. The correspondence between the system's operating state and the pointer position is as follows: When the drive belt 104 is completely stationary, the centrifugal assembly 206 is in its initial state, the telescopic spring 206d pushes the movable ring 206a to its rearmost end, and the pointer 207c points to the very front of the stationary scale zone (e.g., 0 mark). When the drive belt 104 is running normally at its rated speed without slippage, the centrifugal force reaches its maximum, the movable ring 206a moves to its rearmost end, and the pointer 207c points to the very end of the normal speed scale zone (e.g., 100% mark). When the drive belt 104 is running but the speed is lower than the rated value (e.g., light load or slightly slack belt), the pointer 207c points to the front area of ​​the normal speed scale zone (e.g., 60%~90% mark). When the drive belt 104 slips significantly, the speed of the tension roller drops sharply, the centrifugal force decreases significantly, the movable ring 206a moves forward rapidly under the action of the spring, and the pointer 207c swings back to the slippage warning scale area (usually marked in red), thus visually alerting the operator to check the belt tension or eliminate the slippage fault in time.

[0031] Finally, to further improve the smoothness of the lifting adjustment and the sealing effect of the protective shell, two lifting rods 208b are symmetrically arranged vertically, and the protective shell 209 is sleeved on the two lifting rods 208b. The two symmetrical lifting rods 208b can balance the force on the lifting block 202 and avoid the deflection torque generated by unilateral drive; the protective shell 209 is sleeved on both lifting rods, which not only ensures the fixed stability of the protective shell, but also prevents the protective shell from interfering with the lifting rods during lifting adjustment.

[0032] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0033] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0034] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A belt system with built-in tensioning function, characterized in that, include: A belt drive mechanism (100) includes a mounting frame (101). A servo motor (102) is fixedly mounted on the upper side of the rear end of the mounting frame (101). The output shaft of the servo motor (102) is driven by a drive roller (103) via a coupling. The drive roller (103) is rotatably connected to the front side of the mounting frame (101). A drive belt (104) is driven by the outer surface of the drive roller (103). A driven roller (105) is driven by the inner side of the lower left side of the drive belt (104). An integrated tension detection mechanism (200) includes a fixed plate (201) fixedly installed on the back of the mounting frame (101). A lifting groove (201a) is provided on the front side of the fixed plate (201). A lifting block (202) is slidably connected to the front side of the lifting groove (201a). A tensioning shaft (203) is rotatably connected to the center of the lifting block (202). A tensioning roller (204) is fixedly connected to the front end of the tensioning shaft (203), and the tensioning roller (204) is driven to the lower right side inside the transmission belt (104). A rotating rod (205) is fixedly connected to the rear end of the tensioning shaft (203). The rear end of the rotating rod (205) passes through the lifting groove (201a) and extends to the rear side of the fixed plate (201), and is connected to the centrifugal assembly (206). The centrifugal assembly (206) includes a movable ring (206a) that is slidably sleeved on the outer surface of the rotating rod (205). The outer surface of the movable ring (206a) is rotatably connected to an L-shaped drive plate (206b). The bottom end of the L-shaped drive plate (206b) is connected to a slip indicator assembly (207). The rear end of the fixed plate (201) is also equipped with a lifting adjustment assembly (208), and the lifting adjustment assembly (208) is connected to the lifting block (202).

2. The belt system with built-in tensioning function as described in claim 1, characterized in that: The mounting bracket (101) has a through groove (101a) on its lower right side, and the front end of the lifting block (202) is slidably connected in the through groove (101a).

3. The belt system with built-in tensioning function as described in claim 2, characterized in that: The lifting adjustment assembly (208) includes a threaded rod (208a) rotatably connected to the left side of the fixed plate (201). The outer surface of the threaded rod (208a) is threaded with a lifting rod (208b), and the right end of the lifting rod (208b) is fixedly connected to the rear wall of the lifting block (202). The bottom end of the threaded rod (208a) is fixedly connected with a knob (208c).

4. The belt system with built-in tensioning function as described in claim 3, characterized in that: The rotating rod (205), centrifugal assembly (206) and slip indicator assembly (207) are fitted with protective shells (209). The middle part of the lifting rod (208b) penetrates the shell of the protective shell (209). One end of the lifting rod (208b) is fixedly connected to the lifting block (202) located inside the protective shell (209). The other end of the lifting rod (208b) is threadedly connected to the threaded rod (208a) located outside the protective shell (209).

5. The belt system with built-in tensioning function as described in claim 4, characterized in that: The centrifugal assembly (206) further includes a fixing ring (206c) fixedly installed on the outer surface of the front end of the rotating rod (205). The fixing ring (206c) is elastically connected to the movable ring (206a) at the rear end through a telescopic spring (206d). Centrifugal rods (206e) are hinged to both sides of the fixing ring (206c). Centrifugal balls (206f) are fixedly installed at the tail ends of the two centrifugal rods (206e). Pull rods (206g) are hinged to both sides of the movable ring (206a). Hinge sleeves (206h) are hinged to the front ends of the two pull rods (206g), and the two hinge sleeves (206h) are respectively fixedly installed on the outer surfaces of the two centrifugal rods (206e).

6. The belt system with built-in tensioning function as described in claim 5, characterized in that: A limiting groove (209a) is provided inside the protective shell (209) and directly below the movable ring (206a). The bottom of the L-shaped drive plate (206b) is slidably connected in the limiting groove (209a). The top of the L-shaped drive plate (206b) is sleeved on the outer surface of the movable ring (206a). The movable ring (206a) is rotatably connected to the rotating rod (205) and the L-shaped drive plate (206b).

7. The belt system with built-in tensioning function as described in claim 6, characterized in that: The slip indication component (207) includes a rotating shaft (207a) rotatably connected to the bottom of the inner part of the protective shell (209). A fan-shaped toothed plate (207b) is fixedly installed on the outer surface of the rotating shaft (207a). A pointer (207c) is fixedly installed at the bottom of the fan-shaped toothed plate (207b). The slip indication component (207) also includes a scale (207d) fixedly installed on the bottom wall of the outer part of the protective shell (209). The bottom of the pointer (207c) penetrates the bottom wall of the inner part of the protective shell (209) and extends to the scale mark of the scale (207d).

8. The belt system with built-in tensioning function as described in claim 7, characterized in that: The bottom of the L-shaped drive plate (206b) is fixedly equipped with a rack (206i) that is compatible with the fan-shaped toothed plate (207b), and the bottom of the L-shaped drive plate (206b) is connected to the fan-shaped toothed plate (207b) through the rack (206i).

9. The belt system with built-in tensioning function as described in claim 8, characterized in that: The dial (207d) is provided with a stationary scale area, a normal speed scale area, and a slippage warning scale area in sequence along the swing direction of the pointer (207c). When the transmission belt (104) is stationary, the centrifugal assembly (206) is in its initial state, and the pointer (207c) points to the front end of the stationary scale area. When the transmission belt (104) is running normally at its rated speed without slippage, the pointer (207c) points to the back end of the normal speed scale area. When the transmission belt (104) is running but the speed is lower than the rated value, the pointer (207c) points to the front area of ​​the normal speed scale area. When the transmission belt (104) slips, the pointer (207c) points to the slippage warning scale area.

10. The belt system with built-in tensioning function as described in claim 9, characterized in that: Two lifting rods (208b) are symmetrically arranged vertically, and the protective shell (209) is sleeved on the two lifting rods (208c).

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