Tensioning device for belt drive

Abstract

The present invention relates to the technical field of mechanical transmission, and provides a tensioning device for a belt transmission mechanism, including a driving device and a tensioning adjustment device, wherein the driving device includes a mounting base plate, a motor bracket, a driving motor, a rotating shaft, a bearing seat and a belt transmission assembly, wherein the motor bracket is supported on the mounting base plate, and a connecting structure is provided between the motor bracket and the mounting base plate so that the two can move relative to each other; the driving motor is supported on the motor bracket, and the bearing seat is sleeved on the rotating shaft and is connected and fixed to the mounting base plate. The tensioning adjustment device includes an adjusting base plate and a positioning base block provided on the adjusting base plate, and the positioning base block has a positioning hole for inserting the motor shaft of the driving motor; a guide groove is provided on the adjusting base plate, and a guide rib is provided on the inner wall of the guide groove for abutting against the outer peripheral wall of the bearing seat. Compared with the prior art, the tensioning consistency of the belt transmission assembly is ensured, and the installation is convenient, the structure is simple, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a tensioning device of a belt transmission mechanism. Background Art

[0002] Belt drive is a kind of mechanical transmission that uses a flexible belt tensioned on a pulley to transmit motion or power. It has the characteristics of simple structure, smooth transmission, buffering and vibration absorption, and can transmit power between large axle spacing and multiple axes. It is also low in cost, does not require lubrication, and is easy to maintain. Therefore, it is widely used in industries such as industry, automobiles, agricultural machinery, and household appliances.

[0003] For a drive device with a belt transmission mechanism, each drive device needs to be debugged before the belt drive device is produced to make it have a certain tension. There are three main traditional tensioning and debugging methods: the first is to use a tensioning wheel to press the transmission belt by relying on a spring or gravity to prevent the transmission belt from loosening and slipping during use. However, this structure is relatively complex and the cost is relatively high; the second is to manually adjust the relative position of the driving pulley and the driven pulley to achieve the purpose of tensioning the transmission belt. However, for mass production, it is difficult to keep the tightness of the transmission belt consistent; the third is to design the center distance of the driving pulley and the driven pulley based on experience to be relatively fixed, however, it will make the transmission belt difficult to install. Summary of the invention

[0004] The purpose of the present invention is to provide a tensioning device for a belt transmission mechanism to solve the technical problems in the prior art that the tensioning structure of a driving device with a belt transmission mechanism is relatively complex and costly, and the tensioning degree of the transmission belt is difficult to maintain consistent and the transmission belt is difficult to install.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a tensioning device of a belt transmission mechanism, comprising a driving device and a tensioning adjusting device for adjusting the tension of the driving device, wherein the driving device comprises:

[0006] Install the base plate;

[0007] A motor bracket is supported on the mounting base plate, and a connecting structure is provided between the motor bracket and the mounting base plate so that the two can move relative to each other;

[0008] A driving motor, supported on the motor bracket, wherein the driving motor has a motor shaft, and the motor shaft extends toward the mounting base plate in a direction perpendicular to the surface of the mounting base plate;

[0009] Rotating shaft;

[0010] A bearing seat, sleeved on the rotating shaft and fixedly connected to the mounting base plate; and

[0011] A belt transmission assembly connected between the rotating shaft and the motor shaft;

[0012] The tension adjustment device comprises:

[0013] an adjustment base plate for supporting the mounting base plate; and

[0014] A positioning base block is arranged on the adjusting substrate, and the positioning base block has a positioning hole for the motor shaft to be placed in;

[0015] The adjusting substrate is provided with a guide groove for the bearing seat to be placed therein, and the inner wall of the guide groove is provided with a guide rib for abutting against the outer peripheral wall of the bearing seat, and when the bearing seat rotates relative to the adjusting substrate around the axis of the motor shaft, the distance between the center line of the bearing seat and the axis of the motor shaft is adjusted.

[0016] Further, the surface of the positioning base block has a transverse direction and a longitudinal direction perpendicular to each other; the guide groove includes an insertion area and a positioning area connected to each other, and the guide rib includes a first straight line segment, a second straight line segment, a first arc segment located in the insertion area, a second arc segment located in the positioning area, and a transition arc segment located between the first arc segment and the second arc segment, the first straight line segment extends from the first arc segment to the transition arc segment along a direction parallel to the longitudinal direction, and the second straight line segment extends from the transition arc segment to the second arc segment along a direction parallel to the transverse direction; the length dimension of the first straight line segment is greater than the length dimension of the second straight line segment.

[0017] Furthermore, an installation groove is provided on the adjustment substrate, and the installation groove extends from the middle of the adjustment substrate to the periphery of the adjustment substrate along a direction parallel to the longitudinal direction; the positioning base block is slidably arranged in the installation groove, and the positioning base block and the adjustment substrate are provided with a distance adjustment structure so that the two can move relative to each other.

[0018] Furthermore, the distance adjustment structure includes a base block fixing hole provided on the adjustment substrate, and a base block waist-shaped hole provided on the positioning base block and corresponding to the base block fixing hole.

[0019] Furthermore, a limiting protrusion is protruded outwardly on the side wall of the positioning base block to limit the relative movement between the positioning base block and the adjustment substrate in the thickness direction of the adjustment substrate.

[0020] Furthermore, the adjusting substrate is provided with a plurality of avoidance grooves which are independent of the guide grooves.

[0021] Furthermore, the connection structure includes a bracket fixing hole provided on the mounting base plate, and a bracket waist-shaped hole provided on the motor bracket and corresponding to the bracket fixing hole.

[0022] Furthermore, the belt transmission assembly includes a driving wheel keyed to the motor shaft, a driven wheel keyed to the rotating shaft, and a transmission belt wrapped between the driving wheel and the driven wheel.

[0023] Furthermore, a bearing assembly is arranged between the bearing seat and the rotating shaft, and the bearing assembly includes two bearings arranged at intervals along the axial direction of the rotating shaft and a shaft end retaining ring arranged between the two bearings.

[0024] Further, the rotating shaft includes a supporting portion and a connecting portion which are connected to each other, the bearing seat is sleeved on the supporting portion, the connecting portion has an axial limiting surface located at its top end and used to support the bearing, and the axial limiting surface is arranged around the supporting portion; an axial limiting groove is opened on the supporting portion, and the axial limiting groove extends along the entire circumference of the supporting portion, and a retaining ring is engaged in the axial limiting groove of the supporting portion for limiting the movement of the bearing.

[0025] Compared with the prior art, the tensioning device of the belt transmission mechanism provided by the present invention adopts a driving device and a tensioning adjustment device. The tensioning adjustment device includes an adjusting base plate and a positioning base block. The positioning holes of the positioning base block can be used to maintain the positions of the motor bracket and the driving motor. The relative position of the mounting base plate and the motor bracket is adjusted by moving the bearing seat along the guide rib in the guide groove, that is, the relative position of the motor shaft of the driving motor and the rotating shaft is adjusted, thereby ensuring the consistency of the tensioning degree of the belt transmission assembly. The device is easy to install, has a simple structure and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional schematic diagram of a tensioning device of a belt transmission mechanism provided by an embodiment of the present invention;

[0027] Figure 2 is a bottom view schematic diagram of a tensioning device of a belt transmission mechanism provided by an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic cross-sectional view of the AA plane;

[0029] Figure 4 Schematic diagram of the tensioning device of the belt transmission mechanism provided by the embodiment of the present invention Figure 1 ;

[0030] Figure 5 Schematic diagram of the tensioning device of the belt transmission mechanism provided by the embodiment of the present invention Figure 2 .

[0031] Main component symbols

[0032] 100: tensioning device of belt transmission mechanism 10: driving device

[0033] 11: Installation base plate 111: First perforation

[0034] 112: Second piercing

[0035] 12: Motor bracket 121: Cover

[0036] 122: Foot 123: Accommodation space

[0037] 13: drive motor 131: motor shaft

[0038] 132: Motor fastener 133: Third perforation

[0039] 14: Rotating shaft 141: Transmission part

[0040] 142: Supporting part 143: Connecting part

[0041] 144: Axial limiting surface 145: Axial limiting groove

[0042] 15: Bearing seat 151: Bearing seat fastener

[0043] 16: Belt drive assembly 161: Driving wheel

[0044] 162: driven wheel 163: transmission belt

[0045] 17: Connection structure 171: Bracket fixing hole

[0046] 172: Bracket waist hole 173: Bracket fastener

[0047] 18: Bearing assembly 181: Bearing

[0048] 182: Shaft end retaining ring 183: Snap ring

[0049] 20: Tension adjustment device

[0050] 21: Adjustment base plate 211: Guide groove

[0051] 211a: Insertion area 211b: Positioning area

[0052] 212: Guide rib 213: First arc segment

[0053] 214: First straight line segment 215: Transition arc segment

[0054] 216: Second straight line segment 217: Second arc segment

[0055] 218: Install the slide 219: Avoidance groove

[0056] 22: Positioning base block 221: Positioning hole

[0057] 222: Limiting convex part

[0058] 23: Adjustable distance structure 231: Base block fixing hole

[0059] 232: Base block waist hole DETAILED DESCRIPTION

[0060] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] In order to enable those skilled in the art to better understand the technical solution of the present invention, the implementation of the present invention is described in detail below with reference to specific drawings.

[0062] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0063] like Figures 1 to 5 As shown, it is a preferred embodiment provided by the present invention.

[0064] The tensioning device 100 of the belt transmission mechanism provided in this embodiment includes a driving device 10 and a tensioning adjustment device 20 for adjusting the tension of the driving device 10, wherein the driving device 10 includes a mounting base plate 11, a motor bracket 12, a driving motor 13, a rotating shaft 14, a bearing seat 15 and a belt transmission assembly 16, wherein the motor bracket 12 is supported on the mounting base plate 11, and a connecting structure 17 is provided between the motor bracket 12 and the mounting base plate 11 so that the two can move relative to each other; the driving motor 13 is supported on the motor bracket 12, and the driving motor 13 has a motor shaft 131, and the motor shaft 131 extends toward the mounting base plate 11 in a direction perpendicular to the surface of the mounting base plate 11; the bearing seat 15 is sleeved on the rotating shaft 14 and is connected and fixed to the mounting base plate 11; the belt transmission assembly 16 is connected between the rotating shaft 14 and the motor shaft 131. The tensioning adjustment device 20 includes an adjustment base plate 21 and a positioning base block 22. The adjustment base plate 21 is used to support the installation base plate 11; the positioning base block 22 is arranged on the adjustment base plate 21, and the positioning base block 22 has a positioning hole 221 for inserting the motor shaft 131; a guide groove 211 for inserting the bearing seat 15 is opened on the adjustment base plate 21, and a guide rib 212 is arranged on the inner wall of the guide groove 211 to abut against the outer peripheral wall of the bearing seat 15, and when the bearing seat 15 rotates around the axis of the motor shaft 131 relative to the adjustment base plate 21, the distance between the center line of the bearing seat 15 and the axis of the motor shaft 131 is adjusted.

[0065] The tensioning device 100 of the belt transmission mechanism mentioned above adopts a driving device 10 and a tensioning adjustment device 20. The tensioning adjustment device 20 includes an adjustment base plate 21 and a positioning base block 22. The adjustment base plate 21 is used to support the mounting base plate 11; the positioning base block 22 is arranged on the adjustment base plate 21, and the positioning base block 22 has a positioning hole 221 for inserting the motor shaft 131; the adjustment base plate 21 is provided with a guide groove 211 for inserting the bearing seat 15, and the inner wall of the guide groove 211 is provided with a guide rib 212 for abutting against the outer peripheral wall of the bearing seat 15, and the bearing seat 15 is around the motor shaft 131. When the axis of 31 rotates relative to the adjusting base plate 21, the distance between the center line of the bearing seat 15 and the axis of the motor shaft 131 is adjusted. In this way, the positioning hole 221 of the positioning base block 22 can be used to maintain the position of the motor bracket 12 and the drive motor 13. The relative position of the mounting base plate 11 and the motor bracket 12 is adjusted by moving the bearing seat 15 along the guide rib 212 in the guide groove 211, that is, the relative position of the motor shaft 131 of the drive motor 13 and the rotating shaft 14 is adjusted, thereby ensuring the consistency of the tension of the belt drive assembly 16. The installation is convenient, the structure is simple, and the cost is low.

[0066] See also Figures 1 to 5The driving device 10 of this embodiment includes a mounting base 11, a motor bracket 12, a driving motor 13, a rotating shaft 14, a bearing seat 15 and a belt transmission assembly 16. The rotating shaft 14 is used to connect the rotating parts of the robot such as shoulders and arms. The driving motor 13 drives the rotating shaft 14 to rotate.

[0067] See also Figures 1 to 5 The mounting base plate 11 is a substantially rectangular flat plate, on which the motor bracket 12 and the bearing seat 15 are supported. The mounting base plate 11 is provided with a first through hole 111 and a second through hole 112 which are independent of each other.

[0068] See also Figures 1 to 5 The motor bracket 12 is arranged on the mounting base plate 11 and corresponds to the first through hole 111. A connecting structure 17 is arranged between the motor bracket 12 and the mounting base plate 11 so that the two can move relative to each other. In this embodiment, the connecting structure 17 includes a bracket fixing hole 171 opened on the mounting base plate 11, and a bracket waist-shaped hole 172 opened on the motor bracket 12 and corresponding to the bracket fixing hole 171. The bracket fastener 173 passes through the bracket waist-shaped hole 172 and the bracket fixing hole 171 in sequence, and is tightened and fixed with a nut to connect and fix the motor bracket 12 to the mounting base plate 11. The bracket fastener 173 is but not limited to a screw. It is easy to understand that after loosening the bracket fastener 173, the motor bracket 12 and the mounting base plate 11 can be relatively moved at the hole of the bracket waist-shaped hole 172 to adjust the relative position of the motor bracket 12 and the mounting base plate 11. By designing the waist-shaped hole 172 of the bracket, it is convenient to adjust the position of the motor bracket 12 and the mounting base plate 11, so as to adjust the tension of the belt transmission assembly 16.

[0069] Specifically, the motor bracket 12 includes a cover 121 and a foot 122 connected to the bottom end of the cover 121 and extending outward, and a bracket waist hole 172 is opened on the foot 122. A accommodating space 123 is constructed between the cover 121 and the mounting base 11 and is connected to the first through hole 111.

[0070] See also Figures 1 to 5 The drive motor 13 is supported on the motor bracket 12. The drive motor 13 has a motor shaft 131. The motor shaft 131 extends toward the mounting base plate 11 in a direction perpendicular to the surface of the mounting base plate 11. In this embodiment, the drive motor 13 is fixedly mounted on the cover 121 of the motor bracket 12 by a motor fastener 132. The cover 121 is provided with a third through hole 133 for the motor shaft 131 to extend into the accommodating space 123.

[0071] See also Figures 1 to 5The bearing seat 15 has an annular cross-section and is connected and fixed to the mounting base plate 11. In the present embodiment, the bearing seat 15 is fixedly mounted on the bottom surface of the mounting base plate 11 by a bearing seat fastener 151, and corresponds to the second through hole 112. The bearing seat fastener 151 is but not limited to a screw.

[0072] See also Figures 1 to 5 The rotating shaft 14 is connected to the motor shaft 131 of the driving motor 13 through the belt transmission assembly 16. The bearing seat 15 is sleeved on the rotating shaft 14. The two are coaxially arranged, and the two ends of the rotating shaft 14 extend to the ends of the bearing seat 15 respectively. The rotating shaft 14 and the bearing seat 15 can rotate relative to each other, and the axis of the rotating shaft 14 is arranged parallel to the axis of the motor shaft 131. A bearing assembly 18 is arranged between the bearing seat 15 and the rotating shaft 14. In this embodiment, the bearing assembly 18 includes two bearings 181 arranged at intervals along the axial direction of the rotating shaft 14 and a shaft end retaining ring 182 arranged between the two bearings 181. The rotating shaft 14 is a stepped shaft, which includes a transmission part 141, a support part 142 and a connection part 143 connected in sequence. The bearing seat 15 is sleeved on the support part 142. The connection part 143 has an axial limiting surface 144 located at its top end and used to support the bearing. The axial limiting surface 144 is arranged around the support part 142; an axial limiting groove 145 is provided on the support part 142, and the axial limiting groove 145 is extended along the entire circumference of the support part 142. A clamping ring 183 for limiting the movement of the bearing is engaged in the axial limiting groove 145 of the support part 142. It is easy to understand that the clamping ring 183 and the axial limiting surface 144 of the connection part 143 axially limit the rotating shaft 14, so that the relative position of the rotating shaft 14 and the bearing seat 15 is maintained.

[0073] See also Figures 1 to 5 The belt transmission assembly 16 includes a driving wheel 161 keyed to the motor shaft 131, a driven wheel 162 keyed to the rotating shaft 14, and a transmission belt 163 wrapped between the driving wheel 161 and the driven wheel 162. In this embodiment, the driven wheel 162 is keyed to the transmission part 141 of the rotating shaft 14, the transmission belt 163 is but not limited to a synchronous belt, and the driving wheel 161 and the driven wheel 162 are but not limited to synchronous pulleys.

[0074] See also Figures 1 to 5 The tensioning adjustment device 20 is used to adjust the tension of the driving device 10, and includes an adjusting base plate 21 and a positioning base block 22.

[0075] See also Figures 1 to 5 The adjusting substrate 21 is used to support the mounting base plate 11. In the present embodiment, the adjusting substrate 21 is a substantially rectangular flat plate. When the driving device 10 needs to be adjusted, the mounting base plate 11 of the driving device 10 is placed on the adjusting substrate 21.

[0076] See also Figures 1 to 5 The positioning base block 22 is arranged on the adjustment substrate 21, and the positioning base block 22 has a positioning hole 221 into which the motor shaft 131 is placed. In this embodiment, the cross-sectional shape of the positioning hole 221 matches the cross-sectional shape of the motor shaft 131. It can be understood that the mounting base plate 11 of the driving device 10 is placed on the adjustment substrate 21, and the motor shaft 131 is partially placed in the positioning hole 221. The central axis of the positioning hole 221 is coaxially arranged with the axis of the motor shaft 131, and the motor shaft 131 can rotate relative to the positioning base block 22 around the central axis of the positioning hole 221.

[0077] See also Figures 1 to 5 The adjusting substrate 21 is provided with a guide groove 211 for the bearing seat 15 to be placed therein. The inner wall of the guide groove 211 is provided with a guide rib 212 for contacting with the outer peripheral wall of the bearing seat 15 and adjusting the distance between the center line of the bearing seat 15 and the axis of the motor shaft 131 when the bearing seat 15 rotates relative to the adjusting substrate 21 around the axis of the motor shaft 131. In this embodiment, the surface of the positioning base block 22 has a transverse direction (direction D1 shown in the figure, collectively referred to as the first direction D1 below) and a longitudinal direction (direction D2 shown in the figure, collectively referred to as the second direction D2 below) perpendicular to each other. The guide groove 211 includes an insertion area 211a and a positioning area 211b that are connected to each other. The insertion area 211a is used for the bearing seat 15 to be placed therein when the driving device 10 is placed on the adjusting substrate 21. The guide rib 212 includes a first straight segment 214, a second straight segment 216, a first arc segment 213 located in the insertion area 211a, a second arc segment 217 located in the positioning area 211b, and a transition arc segment 215 located between the first arc segment 213 and the second arc segment 217. The first straight segment 214 extends from the first arc segment 213 along a direction parallel to the second direction D2 to the transition arc segment 215, and the second straight segment 216 extends from the transition arc segment 215 along a direction parallel to the first direction D1 to the second arc segment 217. The length dimension of the first straight segment 214 is greater than the length dimension of the second straight segment 216.

[0078] Specifically, the first arc segment 213 and the second arc segment 217 are both bent toward the center of the guide groove 211, and the center angles of the first arc segment 213 and the second arc segment 217 are both 90°. The transition arc segment 215 is bent toward the outside of the guide groove 211, and its center angle is 90°. The radius of the first arc segment 213 is the same as that of the second arc segment 217, and is smaller than that of the transition arc segment 215. It should be noted that when the bearing seat 15 is located in the insertion area 211a, its outer peripheral wall is tangent to the first straight line segment 214. When the bearing seat 15 slides into the positioning area 211b, its outer peripheral wall is tangent to the second straight line segment 216. The pre-adjusted spacing L1 between the center of the positioning hole 221 and the first straight line segment 214 is smaller than the adjustment spacing L2 between the center of the positioning hole 221 and the second straight line segment 216. After the bearing seat 15 slides from the insertion area 211a into the positioning area 211b along the guide rib 212, the spacing between the center axis of the bearing seat 15 and the center line of the positioning hole 221 is the radius size of the bearing seat 15 plus the adjustment spacing L2.

[0079] See also Figures 1 to 5 In this embodiment, after the position of the positioning base block 22 is set, the adjustment spacing L2 between the center of the positioning hole 221 and the second straight segment 216 is the set value. Before adjusting the driving device 10, the bracket fastener 173 is loosened, that is, the motor bracket 12 and the mounting base plate 11 can move relatively in the bracket waist-shaped hole 172 of the motor bracket 12. After the motor shaft 131 is placed in the positioning hole 221 of the positioning base block 22, at the same time, the bearing seat 15 is placed in the placement area 211a, and the bearing seat 15 is pushed along the guide block. The edge 212 slides into the positioning area 211b, and while the bearing seat 15 slides, the entire drive device 10 swings around the center line of the positioning hole 221. Since the relative positions of the motor bracket 12, the drive motor 13 and the driving wheel 161 are maintained by the positioning base block 22, the bearing seat 15, the rotating shaft 14 and the mounting base plate 11 will move relative to the motor bracket 12 while swinging, and after the bearing seat 15 slides into the positioning area 211b, the bracket fastener 173 is tightened to connect and fix the motor bracket 12 to the mounting base plate 11. It can be understood that the tensioning adjustment device 20 is used to adjust the drive device 10 to ensure that after each drive device 10 is adjusted, the spacing between the axis of the motor shaft 131 and the axis of the rotating shaft 14 is uniform, and the tension of the belt transmission assembly 16 is consistent.

[0080] See also Figures 1 to 5In this embodiment, the adjustment substrate 21 is provided with an installation slot 218, which extends from the middle of the adjustment substrate 21 to the periphery of the adjustment substrate 21 along a direction parallel to the second direction D2; the positioning base block 22 is slidably arranged in the installation slot 218, and the positioning base block 22 and the adjustment substrate 21 are provided with a distance adjustment structure 23, so that the two can move relative to each other. In this embodiment, the distance adjustment structure 23 includes a base block fixing hole 231 provided on the adjustment substrate 21, and a base block waist-shaped hole 232 provided on the positioning base block 22 and corresponding to the base block fixing hole 231. A base block fastener (not shown) sequentially passes through the base block waist-shaped hole 232 and the base block fixing hole 231, and is tightened and fixed with a nut to connect and fix the positioning base block 22 to the adjustment substrate 21. The base block fastener is, but not limited to, a screw.

[0081] See also Figures 1 to 5 A limiting protrusion 222 is protruded outwardly on the side wall of the positioning base block 22 to limit the relative movement of the positioning base block 22 and the adjustment substrate 21 in the thickness direction of the adjustment substrate 21. The limiting protrusion 222 abuts against the bottom surface of the adjustment substrate 21, and the base block waist-shaped hole 232 is opened on the limiting protrusion 222.

[0082] See also Figures 1 to 5 An avoidance groove 219 independent of the guide groove 211 is provided on the adjustment substrate 21. In the present embodiment, the number of the avoidance grooves 219 is but not limited to two. It is easy to understand that by providing the avoidance groove 219, after the bearing seat 15 slides into the positioning area 211b, it is convenient to operate the nut from the bottom of the adjustment substrate 21, so as to tighten the nut and the bracket fastener 173. In this way, it is easy to install the motor bracket 12 and the mounting base plate 11, thereby improving the assembly effect.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tensioning device for a belt transmission mechanism, comprising a driving device and a tensioning adjusting device for adjusting the tension of the driving device, characterized in that: The driving device comprises: Install the base plate; A motor bracket is supported on the mounting base plate, and a connecting structure is provided between the motor bracket and the mounting base plate so that the two can move relative to each other; A driving motor, supported on the motor bracket, wherein the driving motor has a motor shaft, and the motor shaft extends toward the mounting base plate in a direction perpendicular to the surface of the mounting base plate; Rotating shaft; A bearing seat, sleeved on the rotating shaft and fixedly connected to the mounting base plate; and A belt transmission assembly connected between the rotating shaft and the motor shaft; The tension adjustment device comprises: an adjustment base plate for supporting the mounting base plate; and A positioning base block is arranged on the adjusting substrate, the positioning base block has a positioning hole for the motor shaft to be placed in, and the surface of the positioning base block has a horizontal direction and a vertical direction perpendicular to each other; The adjusting substrate is provided with a guide groove for the bearing seat to be placed therein, and the inner wall of the guide groove is provided with a guide rib for abutting against the outer peripheral wall of the bearing seat, and when the bearing seat rotates relative to the adjusting substrate around the axis of the motor shaft, the distance between the center line of the bearing seat and the axis of the motor shaft is adjusted, and the adjusting substrate is provided with a plurality of avoidance grooves independent of the guide groove.

2. The tensioning device of the belt transmission mechanism according to claim 1, characterized in that: The guide groove includes an insertion area and a positioning area which are connected to each other, and the guide rib includes a first straight line segment, a second straight line segment, a first arc segment located in the insertion area, a second arc segment located in the positioning area, and a transition arc segment located between the first arc segment and the second arc segment, the first straight line segment extends from the first arc segment along a direction parallel to the longitudinal direction to the transition arc segment, and the second straight line segment extends from the transition arc segment along a direction parallel to the transverse direction to the second arc segment; the length dimension of the first straight line segment is greater than the length dimension of the second straight line segment.

3. The tensioning device of the belt transmission mechanism according to claim 2, characterized in that: The adjustment substrate is provided with an installation slot, which extends from the middle of the adjustment substrate to the periphery of the adjustment substrate in a direction parallel to the longitudinal direction; the positioning base block is slidably arranged in the installation slot, and the positioning base block and the adjustment substrate are provided with a distance adjustment structure so that the two can move relative to each other.

4. The tensioning device of the belt transmission mechanism according to claim 3, characterized in that: The distance adjustment structure includes a base block fixing hole provided on the adjustment substrate, and a base block waist-shaped hole provided on the positioning base block and corresponding to the base block fixing hole.

5. The tensioning device of the belt transmission mechanism according to claim 3, characterized in that: A limiting convex portion is protruded outwardly on the side wall of the positioning base block to limit the relative movement between the positioning base block and the regulating substrate in the thickness direction of the regulating substrate.

6. The tensioning device of a belt transmission mechanism according to any one of claims 1 to 5, characterized in that: The connection structure includes a bracket fixing hole provided on the mounting base plate, and a bracket waist-shaped hole provided on the motor bracket and corresponding to the bracket fixing hole.

7. The tensioning device of a belt transmission mechanism according to any one of claims 1 to 5, characterized in that: The belt transmission assembly comprises a driving wheel key-connected to the motor shaft, a driven wheel key-connected to the rotating shaft, and a transmission belt wrapped between the driving wheel and the driven wheel.

8. The tensioning device of a belt transmission mechanism according to any one of claims 1 to 5, characterized in that: A bearing assembly is arranged between the bearing seat and the rotating shaft. The bearing assembly includes two bearings arranged at intervals along the axial direction of the rotating shaft and a shaft end retaining ring arranged between the two bearings.

9. The tensioning device of a belt transmission mechanism according to any one of claims 1 to 5, characterized in that: The rotating shaft includes a supporting portion and a connecting portion that are connected to each other, the bearing seat is sleeved on the supporting portion, the connecting portion has an axial limiting surface located at its top end and used to support the bearing, and the axial limiting surface is arranged around the supporting portion; an axial limiting groove is opened on the supporting portion, and the axial limiting groove extends along the entire circumference of the supporting portion, and a retaining ring for limiting the movement of the bearing is engaged in the axial limiting groove of the supporting portion.

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