Belt tensioning device

Abstract

The invention discloses a belt tensioning device which comprises an idler wheel assembly, a front support and a rear support, the idler wheel assembly comprises a wheel body and a pin shaft, one or more rotating supporting pieces are arranged in the wheel body, the pin shaft penetrates through the rotating supporting pieces and the wheel body and is borne by the front support, the wheel body and the front support are installed together through a connecting piece, and the connecting piece is connected with the front support. The rear support is provided with a telescopic part, the telescopic part is connected with the front support in a sliding manner, springs are axially arranged in the front support and the rear support, one end of each spring is fixed on the front support, and the other end of each spring is fixed on the rear support. The belt tensioning device can automatically tension a belt and keep the belt in a tensioning state all the time, besides being used for tensioning the belt, the belt tensioning device can also be used for other similar occasions needing to keep tensioning and balance, under the action of the spring, the idler wheel keeps making contact with a tensioned object all the time, and the tensioning effect is good. And the tensioned object keeps the tension force and is in a balanced state.

Description

Technical Field

[0001] The invention relates to a belt tensioning device and belongs to the technical field of roller products. Background Art

[0002] In a logistics sorting system, a conveyor line is arranged at an angle to the sorting line. The conveyor line consists of several parallel belts. Driven by a motor, these parallel belts run in the same direction, smoothly transferring items from the conveyor line to the sorting line. A tensioning assembly is typically installed at the end of each belt to tighten the belt.

[0003] Traditional tensioning assemblies consist of a roller assembly and a metal bracket fixed to the conveyor's metal base. The roller assembly is connected to the metal bracket via an adjustment screw. Belt tension is manually adjusted by adjusting the screw. Due to limited equipment space, this adjustment method is difficult and unsafe. Installation with the conveyor line is also complex and labor-intensive. Furthermore, when the belt changes length or tension, such as when it stretches, the traditional fixed tensioning assembly cannot adapt to these changes, resulting in reduced tensioning efficiency or even failure. Summary of the Invention

[0004] The main technical problem solved by the present invention is to provide a belt tensioning device, which can automatically tension a belt and keep the belt in a tensioned state.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: to provide a belt tensioning device, which includes a roller assembly, a front support and a rear support, the roller assembly includes a wheel body and a pin shaft, one or more rotating support members are provided in the wheel body, the pin shaft passes through the rotating support member and the wheel body and is carried by the front support, the wheel body and the front support are installed together through a connecting member, a telescopic part is provided on the rear support, the telescopic part is slidably connected to the front support, a spring is axially arranged in the front support and the rear support, one end of the spring is fixed to the front support, and the other end of the spring is fixed to the rear support.

[0006] Preferably, the rotating support member is a member rotating around a pin axis such as a bearing or a bushing.

[0007] Preferably, the connecting piece is two clamping pieces arranged in the wheel body, the two clamping pieces are respectively located at the two ends of the wheel body, the wheel body is connected to the front support through two clamping pieces, the two clamping pieces are respectively provided with notches, the two ends of the pin shaft respectively extend into the notches, the front support is provided with a snap fit notch, the clamping piece is provided with a buckle, the buckle is clamped in the snap fit notch, a slide groove is axially provided in the front support, the slide groove does not extend to one end portion of the front support close to the rear support, a limiting surface is provided on one end portion of the slide groove close to the rear support, the telescopic part extends into the slide groove, and the end portion of the telescopic part is clamped on the limiting surface.

[0008] Preferably, the front support includes a support arm, and the support arm includes a left support arm and a right support arm arranged opposite to each other, and the left support arm and the right support arm are respectively located on both sides of the front support, and a central part is provided behind one end of the left support arm and the right support arm, and the slide groove is located on the inner wall of the central part, and slideways are respectively provided on the left support arm and the right support arm, and the engaging notch is located on the left support arm and the right support arm, and a cavity is provided in the central part, and a first spring seat is provided at the bottom of the cavity, and one end of the spring is fixed on the first spring seat.

[0009] Preferably, the rear support includes a bottom plate and a sliding portion, the bottom plate and the sliding portion are fixed together, and telescopic portions are symmetrically provided on the upper and lower surfaces or the left and right surfaces of the sliding portion, a groove is provided around the telescopic portion, a protrusion is provided at the front end of the telescopic portion, the telescopic portion extends into the slide groove of the front support, the protrusion is stuck on the limiting surface, and an axially protruding second spring seat is also provided on the side surface of the bottom plate close to the front support, and the other end of the spring is fixed on the second spring seat.

[0010] Preferably, a connecting portion is provided on the bottom plate.

[0011] Preferably, the two ends of the pin shaft are respectively a left end section and a right end section, the middle part of the pin shaft located between the left end section and the right end section is the central section, the diameters of the left end section and the right end section are smaller than the diameter of the central section, the cross-sections of the left end section and the right end section are elliptical, and the shape of the notch is consistent with the cross-sectional shape of the left end section and the right end section.

[0012] Preferably, a plurality of grooves are provided on the outer peripheral surface of the central section of the pin shaft, and the grooves are axially arranged and extend from one end of the pin shaft to the other end of the pin shaft.

[0013] Preferably, the pin is made of engineering plastic, and the clamping member, the front support and the rear support are all made of engineering plastic.

[0014] Preferably, the two clamping parts are symmetrically arranged on the left and right, and the clamping part includes a flange part and a movable part. The flange part is fixedly connected to one end of the movable part, the notch is arranged on the flange part, and the movable part slides into the front support along the slide of the front support. The buckle is arranged on the movable part, and a U-shaped groove is arranged around the buckle.

[0015] The beneficial effects of the present invention are as follows: the belt tensioning device of the present invention can automatically tension the belt. Since springs are arranged in the front support and the rear support, the front support and the rear support are slidingly and actively connected. The distance between the front support and the rear support can automatically change with the change in the tightness of the belt, so that the roller body always keeps in contact with the belt. When the length and tightness of the belt change, the belt can be kept in a tensioned state, avoiding the situation where the tensioning efficiency is reduced or fails. In addition, in addition to being used for belt tensioning, the device of the present invention can also be used in other similar occasions where tensioning and balance need to be maintained. Under the action of the spring, the roller always keeps in contact with the tensioned object, so that the tensioned object maintains the tension and is in a balanced state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0017] Figure 1 It is a structural schematic diagram of the belt tensioning device of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the roller assembly in the belt tensioning device of the present invention;

[0019] Figure 3 is a structural sectional view of the belt tensioning device of the present invention;

[0020] Figure 4 and Figure 5 Schematic diagram of the structure of the front support in the belt tensioning device of the present invention from different viewing directions;

[0021] Figure 6 It is a structural schematic diagram of the rear support in the belt tensioning device of the present invention;

[0022] Figure 7 It is a schematic structural diagram of the pin shaft in the belt tensioning device of the present invention;

[0023] Figure 8 It is a structural schematic diagram of the clamping member in the belt tensioning device of the present invention. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figures 1 to 8 A belt tensioning device includes a roller assembly 1, a front support 2 and a rear support 3, the roller assembly 1 includes a wheel body 11 and a pin shaft 13, one or more rotating support members 101 are provided in the wheel body 11, the pin shaft 13 passes through the rotating support member 101 and the wheel body 11 and is carried by the front support 2, the wheel body 11 and the front support 2 are installed together through a connecting member, a telescopic portion 321 is provided on the rear support 3, the telescopic portion 321 is slidably connected to the front support 2, a spring 24 is axially arranged in the front support 2 and the rear support 3, one end of the spring 24 is fixed to the front support 2, and the other end of the spring 24 is fixed to the rear support 3.

[0026] Preferably, the rotating support member 101 is a member rotating around a pin such as a bearing or a bushing. When the rotating support member 101 is a bearing, there are two bearings 12, which are respectively located at the two ends of the wheel body 11, and the two ends of the pin 13 are respectively located in the two bearings 12, so that the wheel body 11 can rotate around the pin 13.

[0027] Preferably, the connecting member is two clamping members 14 arranged in the wheel body 11, and the two clamping members 14 are respectively located at the two ends of the wheel body 11, and the wheel body 11 is connected to the front support 2 through the two clamping members 14, and the two clamping members 14 are respectively provided with notches 1411, and the two ends of the pin shaft 13 respectively extend into the notches 1411, and the front support 2 is provided with a snap fit notch 212, and the clamping member 14 is provided with a buckle 1421, and the buckle 1421 is stuck in the snap fit notch 212, and a slide groove 233 is axially provided in the front support 2, and the slide groove 233 does not extend to the end portion of the front support 2 close to the rear support 3, and the end portion of the slide groove 233 close to the rear support 3 is provided with a limiting surface 234, and the telescopic portion 321 extends into the slide groove 233, and the end portion of the telescopic portion 321 is stuck on the limiting surface 234 and will not disengage.

[0028] Preferably, the front support 2 includes a support arm 21, and the support arm 21 includes a left support arm 21a and a right support arm 21b arranged opposite to each other, and the 21a and the right support arm 21b are respectively located on both sides of the front support 2, and a center portion 23 is provided behind one end of the left support arm 21a and the right support arm 21b, and the slide groove 233 is located on the inner wall of the center portion 23, and the 21a and the right support arm 21b are respectively provided with a slide 211, and the engaging notch 212 is located on 21a and the right support arm 21b, and a cavity 231 is provided in the center portion 23, and the cavity cross-section is preferably rectangular, and a first spring seat 232 is provided at the bottom of the cavity 231, and one end of the spring 24 is fixed on the first spring seat 232.

[0029] Preferably, the rear support 3 includes a base plate 31 and a sliding portion 32, and the base plate 31 and the sliding portion 32 are fixed together. Telescopic portions 321 are symmetrically provided on the upper and lower surfaces or the left and right surfaces of the sliding portion 32, and a groove 322 is provided around the telescopic portion 321, so that the telescopic portion 321 can be telescoped inwardly and has elasticity, so that the rear support 3 can be installed into the front support 2. A protrusion 3211 is provided at the front end of the telescopic portion 321, and the telescopic portion 321 extends into the slide groove 233 of the front support 2. The protrusion 3211 is stuck on the limiting surface 234. An axially protruding second spring seat 323 is also provided on the side surface of the base plate 31 close to the front support 2, and the other end of the spring 24 is fixed on the second spring seat 323.

[0030] Preferably, a connecting portion 33 is provided on the bottom plate 31, and the connecting portion 33 is used to connect the entire device with the conveying line.

[0031] Preferably, the two ends of the pin shaft 13 are respectively a left end section 13a and a right end section 13b, and the middle part of the pin shaft 13, that is, the part located between the left end section 13a and the right end section 13b, is the central section 13c. The diameters of the left end section 13a and the right end section 13b are smaller than the diameter of the central section 13c. The cross-sections of the left end section 13a and the right end section 13b are elliptical, and the shape of the recess 1411 is consistent with the cross-sectional shape of the left end section 13a and the right end section 13b, and is also elliptical. In this way, the clamping member 14 is relatively fixed to the pin shaft 13 and will not rotate relative to each other.

[0032] Preferably, a plurality of grooves 13d are provided on the outer peripheral surface of the central section 13c of the pin shaft 13. The grooves 13d are axially arranged and extend from one end of the pin shaft 13 to the other end of the pin shaft 13. The grooves 13d can reduce the weight of the pin shaft 13.

[0033] Preferably, the pin 13 is made of engineering plastic, which is also beneficial to reducing the weight of the pin 13 .

[0034] Preferably, the two clamping members 14 are arranged symmetrically on the left and right. The clamping member 14 includes a flange portion 141 and a movable portion 142. The flange portion 141 is fixedly connected to one end of the movable portion 142. The recess 1411 is provided on the flange portion 141. The left end section 13a and the right end section 13b of the pin 13 are respectively inserted into the recesses 1411 on the two clamping members 14. The movable portion 142 slides into the front support 2 along the slideway 211 of the front support 2. The buckle 1421 is arranged on the movable part 142, and a U-shaped groove 1422 is arranged around the buckle 1421, so that the buckle 1421 can be retracted and elastic. When the clamping member 14 is installed into the front support 2 along the slide 211, the buckle 1421 is compressed and retracted inward. When installed in place, the buckle 1421 pops out and is locked into the locking notch 212 of the support arm 21, preventing the clamping member 14 from falling out, and installing and connecting the roller assembly 1 and the front support 2 together.

[0035] Preferably, the clamping member 14, the front support 2 and the rear support 3 are all made of engineering plastics, which helps to reduce the weight of the entire device.

[0036] To assemble the belt tensioner of the present invention, first install the two bearings 12 into the wheel body 11, then insert the pin 13 through the two bearings 12. Next, install the two clamps 14 into the left and right end sections 13a and 13b of the pin 13, respectively. The clamps 14 are then installed into the front support 2 along the slideway 211 on the front support 2. The buckles 1421 of the clamps 14 engage the engaging notches 212, locking the clamps 14. Align the protrusion 3211 of the rear support 3 with the slideway 233 of the front support 2 and move forward. The protrusion 3211 retracts inward and engages the slideway 233. A spring 24 is provided between the front and rear supports 2 and 3, allowing them to move back and forth, automatically tensioning the belt as the tension changes. Finally, the entire belt tensioner is installed into the metal plate of the conveyor line.

[0037] When the belt tensioning device of the present invention is in operation, the entire tensioning device is connected to the conveyor line via the connecting portion 33. The outer surface of the wheel body 11 of the roller assembly 1 presses against the belt on the conveyor line to tension the belt. As the belt tension changes, the pressure on the wheel body 11 varies. When the belt becomes loose, the pressure on the wheel body 11 decreases, and the corresponding pressure on the spring 24 also decreases. The spring 24 extends, causing the front support 2 and the roller assembly 1 to move forward, while the outer surface of the wheel body 11 continues to press against the belt to tension the belt. When the belt becomes tight, the pressure on the wheel body 11 increases, and the corresponding pressure on the spring 24 also increases. The spring 24 compresses, causing the front support 2 and the roller assembly 1 to move backward toward the rear support 3. The outer surface of the wheel body 11 continues to press against the belt to tension the belt. Within a certain range, regardless of whether the belt becomes loose or tight, or if the belt length changes by a certain amount, the wheel body 11 can automatically press against the belt to tension the belt, ensuring that the belt tensioning device of the present invention maintains its tensioning effect.

[0038] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A belt tensioning device, comprising a roller assembly, a front support, and a rear support, wherein the roller assembly comprises a wheel body and a pin, wherein the wheel body is provided with one or more rotating supports, wherein the pin passes through the rotating supports and the wheel body and is supported by the front support, characterized in that: The wheel body and the front support are installed together through a connecting piece, and a telescopic part is provided on the rear support, and the telescopic part is slidably connected to the front support. A spring is axially provided in the front support and the rear support, and one end of the spring is fixed on the front support, and the other end of the spring is fixed on the rear support.

2. The belt tensioning device according to claim 1, characterized in that: The rotating support member is a member rotating around a pin axis such as a bearing or a bushing.

3. The belt tensioning device according to claim 1 or 2, characterized in that: The connecting piece is composed of two clamping pieces arranged in the wheel body, and the two clamping pieces are respectively located at the two ends of the wheel body, and the wheel body is connected to the front support through the two clamping pieces, and the two clamping pieces are respectively provided with notches, and the two ends of the pin shaft respectively extend into the notches, and the front support is provided with a snap fit notch, and the clamping piece is provided with a buckle, and the buckle is clamped in the snap fit notch, and a slide groove is axially provided in the front support, and the slide groove does not extend to one end portion of the front support close to the rear support, and a limited surface is provided on one end portion of the slide groove close to the rear support, and the telescopic part extends into the slide groove, and the end portion of the telescopic part is clamped on the limiting surface.

4. The belt tensioning device according to claim 3, characterized in that: The front support includes a support arm, and the support arm includes a left support arm and a right support arm arranged opposite to each other, and the left support arm and the right support arm are respectively located on both sides of the front support, and a central part is provided behind one end of the left support arm and the right support arm, and the slide groove is located on the inner wall of the central part, and slideways are respectively provided on the left support arm and the right support arm, and the engaging notch is located on the left support arm and the right support arm, and a cavity is provided in the central part, and a first spring seat is provided at the bottom of the cavity, and one end of the spring is fixed on the first spring seat.

5. The belt tensioning device according to claim 4, characterized in that: The rear support includes a base plate and a sliding portion, and the base plate and the sliding portion are fixed together. Telescopic portions are symmetrically arranged on the upper and lower surfaces or the left and right surfaces of the sliding portion. A groove is arranged around the telescopic portion, and a protrusion is arranged at the front end of the telescopic portion. The telescopic portion extends into the sliding groove of the front support, and the protrusion is stuck on the limiting surface. An axially protruding second spring seat is also provided on the side surface of the base plate close to the front support, and the other end of the spring is fixed on the second spring seat.

6. The belt tensioning device according to claim 5, characterized in that: A connecting portion is provided on the bottom plate.

7. The belt tensioning device according to claim 5, characterized in that: The two ends of the pin shaft are respectively a left end section and a right end section, and the middle part of the pin shaft located between the left end section and the right end section is the central section. The diameters of the left end section and the right end section are smaller than the diameter of the central section. The cross-sections of the left end section and the right end section are elliptical, and the shape of the notch is consistent with the cross-sectional shape of the left end section and the right end section.

8. The belt tensioning device according to claim 7, characterized in that: A plurality of grooves are provided on the outer circumferential surface of the central section of the pin shaft. The grooves are axially arranged and extend from one end of the pin shaft to the other end of the pin shaft.

9. The belt tensioning device according to claim 8, characterized in that: The pin shaft is made of engineering plastics, and the clamping piece, the front support and the rear support are all made of engineering plastics.

10. The belt tensioning device according to claim 9, characterized in that: The two clamping parts are symmetrically arranged on the left and right, and the clamping part includes a flange part and a movable part. The flange part is fixedly connected to one end of the movable part, and the notch is arranged on the flange part. The movable part slides into the front support along the slide of the front support, and the buckle is arranged on the movable part, and a U-shaped groove is arranged around the buckle.

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