Belt tensioning device capable of adjusting tension

Abstract

The invention provides a belt tensioning device capable of adjusting tension, and relates to the technical field of mechanical equipment transmission. The tensioning frame is of a T-shaped structure, the two sections of the top of the tensioning frame are each rotationally provided with a fixed wheel through a rotating shaft, the lower end of the tensioning frame is provided with a vertically-movable tensioning wheel, and a belt bypasses the upper ends of the two fixed wheels and penetrates through the bottoms of the tensioning wheels; the lower end of the tensioning frame is provided with an adjusting screw sleeve used for adjusting the tensioning strength of the tensioning wheel. By rotating the adjusting screw sleeve with the lower end of a hexagon nut structure, the screw head of the adjusting screw sleeve can be driven to generate accurate vertical displacement relative to the tensioning frame, so that the compression amount and the elastic force of the first spring are linearly changed, the elastic force is finally transmitted to the tensioning wheel through the tensioning guide rod and the tensioning wheel seat, and stepless, accurate and convenient adjustment of the initial tensioning force of the belt is achieved.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment transmission technology, and in particular to an adjustable belt tensioning device. Background Technology

[0002] In mechanical equipment transmission processes, belt drives are widely used due to their simple structure, low cost, and shock absorption capabilities. Maintaining appropriate and stable belt tension is crucial for ensuring transmission efficiency, preventing slippage, and extending belt life. Traditional belt tensioning devices often employ fixed tensioning pulleys or simple screw adjustment mechanisms. Once the tension is set, it is difficult for them to automatically adapt to the belt's stretching and deformation during operation, easily leading to transmission failure due to belt slack. Furthermore, even if the initial tension is properly adjusted, the contact surface between the belt and the drive or driven pulley may experience localized slippage due to insufficient pressure during long-term operation, affecting the stability of power transmission. While some existing technologies have devices with automatic spring tensioning, their tension preset and fine-tuning are often not convenient or precise enough, and they lack an effective mechanism for maintaining and adaptively adjusting the contact pressure between the belt and the fixed pulley. This makes it difficult to simultaneously achieve precise initial tension setting, dynamic compensation during operation, and continuous and reliable contact surface pressure. Summary of the Invention

[0003] This invention relates to an adjustable belt tensioning device, which integrates a precise initial tension setting function, an automatic tension compensation function during operation, and an adaptive belt pressing function. It has a compact structure, is easy to adjust, and can significantly improve the efficiency, stability, and service life of belt drives.

[0004] This invention provides an adjustable belt tensioning device, specifically comprising: a tensioning frame; the tensioning frame has a T-shaped structure, with fixed wheels rotatably mounted on the top two sections of the tensioning frame via rotating shafts, and a vertically movable tensioning wheel mounted on the lower end of the tensioning frame, the belt passing over the upper ends of the two fixed wheels and through the bottom of the tensioning wheel; an adjusting screw sleeve for adjusting the tension intensity of the tensioning wheel is mounted on the lower end of the tensioning frame; a self-pressure rod is correspondingly provided on the tensioning frame at both ends of each fixed wheel, and a pressure wheel is provided between the two corresponding self-pressure rods, the pressure wheel pressing the belt passing over the fixed wheel onto the fixed wheel.

[0005] Optionally, the vertical rod section of the tensioning frame is provided with movable slots running through it from front to back, and the rotating shafts at both ends of the tensioning wheel slide out from the corresponding movable slots.

[0006] Optionally, mounting holes are provided at the protruding corners of the left and right ends of the bottom of the tensioning frame, and the mounting holes are used to install the frame onto the transmission equipment by bolts.

[0007] Optionally, the top of the tensioning frame is provided with inverted "L"-shaped limiting blocks vertically upward at positions corresponding to the inner side of the pressure bar.

[0008] Optionally, the tensioning wheel is rotatably mounted on the tensioning wheel seat via a rotating shaft. The tensioning wheel seat slides vertically within the tensioning frame cavity between the two movable slots. A tensioning guide rod is fixedly fixed vertically downward at the lower center of the tensioning wheel seat. The tensioning guide rod slides vertically downward through the bottom of the tensioning frame. An end cap is fixedly provided at the lower end of the tensioning guide rod. An adjusting screw sleeve is located at the position where the bottom of the tensioning frame connects with the tensioning guide rod. The tensioning guide rod slides vertically through the adjusting screw sleeve. A first spring is fitted onto the tensioning guide rod between the adjusting screw sleeve and the end cap.

[0009] Optionally, the adjusting screw sleeve and the end cap are each provided with a concave annular groove at one end, and the two ends of the first spring are respectively placed in the corresponding annular groove.

[0010] Optionally, the lower end of the adjusting sleeve is a hexagonal nut structure, and the upper end of the adjusting sleeve is a screw head with an external thread. The screw head is screwed onto the tensioning frame. By rotating the adjusting sleeve, the vertical displacement adjusts the compression distance of the first spring, thereby adjusting the elastic force of the first spring, and further adjusting the tension of the tensioning wheel.

[0011] Optionally, a sleeve is fixedly provided at the lower end of the self-pressure rod, and the sleeve is rotatably mounted on the shaft of the pressure roller. A plug is provided at the other end of the self-pressure rod, and a sleeve block is slidably mounted on the self-pressure rod. The sleeve block is rotatably connected to the shaft of the corresponding pressure roller. A second spring is mounted between the sleeve block and the plug of the self-pressure rod. An arc-shaped flexible guide rod is fixedly connected to the outside of the sleeve block. The other end of the flexible guide rod slides through the fixed plate. The fixed plate is fixedly installed on one side of the tensioning frame, and a bending spring is mounted on the flexible guide rod between the fixed plate and the sleeve block.

[0012] This invention provides an adjustable belt tensioning device, which has the following advantages: First, by rotating the adjusting sleeve, which has a hexagonal nut structure at the lower end, its screw head can be driven to produce a precise vertical displacement relative to the tensioning frame, thereby linearly changing the compression and elasticity of the first spring. This elasticity is transmitted to the tensioning wheel via the tensioning guide rod and the tensioning wheel seat, thus realizing stepless, precise and convenient adjustment of the initial tension of the belt.

[0013] Secondly, the device has excellent automatic tension compensation capability. During operation, when the belt becomes loose due to wear or stretching, the elastic restoring force of the first spring will push the tension wheel seat and tension wheel to move upward along the movable slot, automatically and in real time compensating for the belt elongation, thereby maintaining the dynamic stability of the transmission system tension and effectively avoiding slippage and transmission unreliability problems caused by tension decay.

[0014] Most importantly, the device significantly enhances transmission reliability through a composite pressing mechanism consisting of a self-pressing rod, a pressure roller, a second spring, a flexible guide rod, and a bending spring. In this mechanism, the second spring provides a continuous base clamping force to the pressure roller, ensuring a tight fit between the belt and the fixed pulley. Simultaneously, the arc-shaped flexible guide rod and the bending spring mounted on it form a flexible adaptive component, allowing the pressure roller to follow slight lateral shifts or vibrations of the belt, maintaining uniform and continuous pressing force. This greatly improves the wrap angle and friction between the belt and the fixed pulley, preventing slippage under high-speed or heavy-load conditions. The inverted L-shaped limit block ensures that the self-pressing rod assembly operates within a reasonable range, improving the stability of the entire pressing mechanism. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0016] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0017] In the attached diagram: Figure 1 A schematic diagram of the first axial view structure of the present invention is shown; Figure 2 The present invention is shown Figure 1 Schematic diagram of the A-section structure; Figure 3 A schematic diagram of the second axial view structure of the present invention is shown; Figure 4 This diagram shows an axial view of the structure of the present invention in the separated state of the pressure roller and the tensioning frame; Figure 5 A schematic diagram of the axial view of the pressure roller and self-pressure rod of the present invention is shown; Figure 6 This diagram shows a schematic axial view of the tensioning frame body in a semi-sectional, separated state according to the present invention. Figure 7 A schematic diagram of the tensioning wheel and tensioning frame in a separated state is shown.

[0018] List of reference numerals in the attached diagram: 1. Tensioning frame; 101. Movable strip hole; 102. Mounting hole; 103. Limit block; 2. Fixed wheels; 3. Tensioner wheel; 301. Tensioner wheel seat; 302. Tensioner guide rod; 303. End cap; 304. First spring; 4. Adjusting the threaded sleeve; 401, threaded head; 5. Pressure roller; 6. Self-pressurizing rod; 601. Rod sleeve; 602. Sleeve block; 603. Second spring; 604. Soft guide rod; 605. Bending spring; 606. Fixing plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please refer to Figures 1 to 7 : Example 1: This invention proposes an adjustable belt tensioning device, comprising: a tensioning frame 1; the tensioning frame 1 has a T-shaped structure, with fixed wheels 2 rotatably mounted on the top two sections of the tensioning frame 1 via rotating shafts, and vertically movable tensioning wheels 3 mounted on the lower end of the tensioning frame 1, the belt passing over the upper ends of the two fixed wheels 2 and through the bottom of the tensioning wheels 3; an adjusting screw sleeve 4 for adjusting the tensioning strength of the tensioning wheels 3 is mounted on the lower end of the tensioning frame 1; a self-pressure rod 6 is provided on the tensioning frame 1 at both ends of each fixed wheel 2, and a pressure wheel 5 is provided between the two corresponding self-pressure rods 6, the pressure wheel 5 pressing the belt passing over the fixed wheels 2 onto the fixed wheels 2.

[0021] Among them, the vertical rod section of the tensioning frame 1 has movable strip holes 101 running through it from front to back, and the rotating shafts at both ends of the tensioning wheel 3 slide out from the corresponding movable strip holes 101 respectively.

[0022] Among them, the left and right protruding corners of the bottom of the tensioning frame 1 are respectively provided with mounting holes 102, which are used to install on the transmission equipment by bolts.

[0023] Among them, the top of the tensioning frame 1 is provided with an inverted "L"-shaped limiting block 103 at the position corresponding to the inner side of the self-pressure rod 6.

[0024] The tensioning wheel 3 is rotatably mounted on the tensioning wheel seat 301 via a rotating shaft. The tensioning wheel seat 301 slides vertically within the inner cavity of the tensioning frame 1 between the two movable slots 101. A tensioning guide rod 302 is fixedly fixed vertically downward at the lower middle part of the tensioning wheel seat 301. The tensioning guide rod 302 slides vertically downward through the bottom of the tensioning frame 1. An end cap 303 is fixedly provided at the lower end of the tensioning guide rod 302. An adjusting screw sleeve 4 is located at the position where the bottom of the tensioning frame 1 connects with the tensioning guide rod 302. The tensioning guide rod 302 slides vertically through the adjusting screw sleeve 4. A first spring 304 is fitted onto the tensioning guide rod 302 between the adjusting screw sleeve 4 and the end cap 303.

[0025] The adjusting screw sleeve 4 and the end cap 303 are both provided with concave annular grooves at their corresponding ends, and the two ends of the first spring 304 are respectively placed in the corresponding annular grooves.

[0026] The lower end of the adjusting sleeve 4 is a hexagonal nut structure, and the upper end of the adjusting sleeve 4 is a screw head 401. The screw head 401 has an external thread. The screw head 401 is screwed onto the tensioning frame 1. When the adjusting sleeve 4 rotates, the vertical displacement adjusts the compression distance of the first spring 304, thereby adjusting the elastic force of the first spring 304, and then adjusting the tension of the tensioning wheel 3.

[0027] In Example 2, based on Example 1, a sleeve 601 is fixedly provided at the lower end of the self-pressure rod 6. The sleeve 601 is rotatably mounted on the shaft of the pressure roller 5. A plug is provided at the other end of the self-pressure rod 6. A sleeve block 602 is slidably mounted on the self-pressure rod 6. The sleeve block 602 is vertically rotatably connected to the shaft of the corresponding pressure roller 5. A second spring 603 is mounted between the sleeve block 602 and the plug of the self-pressure rod 6. An arc-shaped soft guide rod 604 is fixedly connected to the outside of the sleeve block 602. The other end of the soft guide rod 604 slides through the fixing plate 606. The fixing plate 606 is fixedly installed on one side of the tensioning frame 1. A bending spring 605 is mounted on the soft guide rod 604 between the fixing plate 606 and the sleeve block 602.

[0028] The following further explains and illustrates the function and effect of each structure mentioned above, so that those skilled in the art can better understand the technical solution: The tensioning frame 1, as the main frame of the device, provides stable support through its T-shaped structure. The two fixed wheels 2, mounted on the top two sections via rotating shafts, guide the belt's direction. The belt passes over the top of the two fixed wheels 2 and then through the bottom of the vertically movable tensioning wheel 3 mounted at the lower end of the tensioning frame 1, thus forming the belt's transmission path. The vertically movable design of the tensioning wheel 3 allows it to be adjusted according to the belt tension. The adjusting screw 4 at the lower end of the tensioning frame 1 is used to adjust the tension strength of the tensioning wheel 3. By rotating the adjusting screw 4, the compression distance of the first spring 304 can be changed, thereby adjusting the elastic force and controlling the pressure of the tensioning wheel 3 on the belt. To ensure a tight fit between the belt and the fixed wheels 2, each end of the tensioning frame 1 at both ends of each fixed wheel 2 is provided with a self-pressure rod 6. A pressure wheel 5 is provided between the two corresponding self-pressure rods 6. The pressure wheel 5 presses the belt passing over the fixed wheel 2 onto the fixed wheel 2, preventing belt slippage. The vertical rod section of the tensioning frame 1 has a through-hole 101 that allows the rotating shafts at both ends of the tensioning wheel 3 to slide, enabling the tensioning wheel 3 to move smoothly. The mounting hole 102 at the bottom of the tensioning frame 1 is used to fix the entire device to the transmission equipment with bolts, improving stability. The limiting block 103 is designed as an inverted L-shape, vertically upwards at the top of the tensioning frame 1 corresponding to the inner side of the self-pressure rod 6, used to limit the range of motion of the self-pressure rod 6. The tensioning wheel 3 is rotatably mounted on the tensioning wheel seat 301 via a rotating shaft. The tensioning wheel seat 301 slides vertically within the cavity of the tensioning frame 1. The tensioning guide rod 302 at the lower end of the tensioning wheel seat 301 slides downwards through the bottom of the tensioning frame 1. The end cap 303 is fixedly mounted on the lower end of the tensioning guide rod 302. A first spring 304 is fitted onto the tensioning guide rod 302 between the adjusting screw sleeve 4 and the end cap 303. The two ends of the first spring 304 are respectively placed in the annular grooves of the adjusting screw sleeve 4 and the end cap 303 to ensure spring stability. The lower end of the adjusting sleeve 4 is a hexagonal nut structure, which facilitates tool rotation. The upper end of the screw head 401 has an external thread and is screwed onto the tensioning frame 1. Rotating the adjusting sleeve 4 allows it to be vertically displaced, thereby adjusting the compression distance and elastic force of the first spring 304, and thus precisely controlling the tension of the tensioning wheel 3. The lower end of the self-pressure rod 6 is rotatably mounted on the shaft of the pressure wheel 5 through the rod sleeve 601. The other end of the self-pressure rod 6 has a plug. The sleeve block 602 is slidably mounted on the self-pressure rod 6 and is vertically rotatably connected to the shaft of the pressure wheel 5. The second spring 603 between the sleeve block 602 and the plug provides clamping force, so that the pressure wheel 5 continuously presses the belt. The flexible guide rod 604 connected to the outside of the sleeve block 602 slides through the fixed plate 606. The fixed plate 606 is fixed on the tensioning frame 1. The bending spring 605 is fitted on the flexible guide rod 604 between the fixed plate 606 and the sleeve block 602, further assisting the pressing action of the pressure roller 5, ensuring the contact area between the belt and the fixed roller 2, and enhancing the transmission efficiency.

[0029] Working Principle: In use, the tensioning frame 1 is first securely installed on the transmission equipment through the mounting hole 102. Then, the belt is passed over the two fixed pulleys 2 sequentially and guided through the bottom of the tensioning pulley 3 located at the lower end of the tensioning frame 1, thus forming a complete transmission loop. The core adjustment function of the device is achieved through the adjusting sleeve 4. Rotating the lower end of the adjusting sleeve 4, which has a hexagonal nut structure, drives its screw head 401 to produce a vertical displacement relative to the tensioning frame 1, thereby changing the compression of the first spring 304 fitted on the tensioning guide rod 302. The two ends of the first spring 304 are respectively housed in the annular grooves of the adjusting sleeve 4 and the end cap 303. Its elastic force change is transmitted to the tensioning pulley seat 301 through the tensioning guide rod 302, forcing the tensioning pulley seat 301 to slide vertically within the inner cavity of the tensioning frame 1. The rotating shaft of the tensioning pulley 3 moves smoothly under the guidance of the movable strip hole 101, thereby applying the required initial tension force to the belt passing over its bottom.

[0030] During the operation of the transmission system, if the belt tends to loosen due to stretching or changes in operating conditions, the elastic restoring force of the first spring 304 will continuously push the tensioning pulley seat 301 and the tensioning pulley 3 upward, automatically compensating for the belt elongation and maintaining dynamic tension stability. Simultaneously, to ensure effective engagement between the belt and the fixed pulley 2 and to prevent slippage, the device is equipped with a pressing mechanism consisting of a self-pressing rod 6 and a pressure roller 5. Under the push of the second spring 603, the sleeve block 602 slides on the self-pressing rod 6, ensuring that the pressure roller 5 always tends to press the belt towards the fixed pulley 2. Furthermore, the arc-shaped soft guide rod 604 connected to the sleeve block 602 and the bending spring 605 fitted onto it further provide flexible auxiliary pressing force. This structure allows the pressure roller 5 to adapt to minor changes in belt position or deviation, maintaining uniform and continuous pressing force. The inverted L-shaped limiting block 103 constrains the swing range of the self-pressing rod 6, preventing excessive movement.

[0031] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0032] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0033] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An adjustable tension belt tensioning device, comprising: Tensioning frame (1); the tensioning frame (1) is a T-shaped structure, and the top two sections of the tensioning frame (1) are respectively mounted with fixed wheels (2) by rotating shafts. The tensioning frame (1) is characterized in that the lower end of the tensioning frame (1) is equipped with a vertically movable tensioning wheel (3), and the belt passes through the bottom of the tensioning wheel (3) from the upper end of the two fixed wheels (2); the lower end of the tensioning frame (1) is equipped with an adjusting screw sleeve (4) for adjusting the tension strength of the tensioning wheel (3); each of the two ends of the tensioning frame (1) of the fixed wheel (2) is respectively provided with a self-pressure rod (6), and a pressure wheel (5) is provided between the two corresponding self-pressure rods (6). The pressure wheel (5) presses the belt passing through the fixed wheel (2) onto the fixed wheel (2).

2. The adjustable tension belt tensioning device according to claim 1, characterized in that, The vertical rod section of the tensioning frame (1) has movable slots (101) extending through it from front to back. The rotating shafts at both ends of the tensioning wheel (3) slide out from the corresponding movable slots (101).

3. The adjustable tension belt tensioning device according to claim 1, characterized in that, The tensioning frame (1) has mounting holes (102) through the protruding corners at the left and right ends of its bottom. The mounting holes (102) are used to install the tensioning frame (1) on the transmission equipment by means of bolts.

4. The adjustable tension belt tensioning device according to claim 1, characterized in that, The tensioning frame (1) has inverted "L"-shaped limiting blocks (103) vertically upward at the position corresponding to the inner side of the self-pressure rod (6) on the top.

5. The adjustable tension belt tensioning device according to claim 2, characterized in that, The tension wheel (3) is rotatably mounted on the tension wheel seat (301) via a rotating shaft. The tension wheel seat (301) slides vertically in the inner cavity of the tension frame (1) between the two movable slots (101). A tension guide rod (302) is fixedly fixed vertically downward at the lower middle part of the tension wheel seat (301). The tension guide rod (302) slides vertically downward through the bottom of the tension frame (1). An end cap (303) is fixedly provided at the lower end of the tension guide rod (302). An adjusting screw sleeve (4) is located at the position where the bottom of the tension frame (1) connects with the tension guide rod (302). The tension guide rod (302) slides vertically through the adjusting screw sleeve (4). The tension guide rod (302) between the adjusting screw sleeve (4) and the end cap (303) is fitted with a first spring (304).

6. The adjustable tension belt tensioning device according to claim 5, characterized in that, The adjusting sleeve (4) and the end cap (303) are both provided with concave annular grooves at their corresponding ends, and the two ends of the first spring (304) are respectively placed in the corresponding annular grooves.

7. The adjustable tension belt tensioning device according to claim 5, characterized in that, The lower end of the adjusting sleeve (4) is a hexagonal nut structure, and the upper end of the adjusting sleeve (4) is a screw head (401). The screw head (401) has an external thread. The screw head (401) is screwed onto the tensioning frame (1). When the adjusting sleeve (4) rotates, the vertical displacement adjusts the compression distance of the first spring (304), thereby adjusting the elastic force of the first spring (304) and thus adjusting the tension of the tensioning wheel (3).

8. The adjustable tension belt tensioning device according to claim 1, characterized in that, The lower end of the self-pressure rod (6) is fixedly provided with a rod sleeve (601), which is rotatably mounted on the shaft of the pressure roller (5). The other end of the self-pressure rod (6) is provided with a plug. A sleeve block (602) is slidably mounted on the self-pressure rod (6). The sleeve block (602) is vertically connected to the shaft of the corresponding pressure roller (5). A second spring (603) is mounted between the sleeve block (602) and the plug of the self-pressure rod (6). An arc-shaped soft guide rod (604) is fixedly connected to the outside of the sleeve block (602). The other end of the soft guide rod (604) slides through the fixed plate (606). The fixed plate (606) is fixedly installed on one side of the tensioning frame (1). A bending spring (605) is mounted on the soft guide rod (604) between the fixed plate (606) and the sleeve block (602).

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