CN214146444U - Tensioning mechanism and synchronous belt transmission mechanism - Google Patents

Abstract

The utility model relates to a storage logistics machinery especially relates to a straining device and synchronous belt drive mechanism. This straining device includes mounting bracket, take-up pulley subassembly and two swinging booms, and the take-up pulley subassembly is used for the tensioning hold-in range, including the tensioning shaft, the tensioning shaft cunning is located on the mounting bracket, and two swinging booms are located the both sides of mounting bracket respectively, and the one end fixed connection of two swinging booms just is connected with the mounting bracket pin joint, and the other end of two swinging booms is connected with the both ends of tensioning shaft respectively. Because two swinging boom pass through the take-up pulley hub connection, just can guarantee that the take-up pulley subassembly applies the even unanimity of tensile force in synchronous belt along each position of width direction, avoid the hold-in range to take place off tracking, wearing and tearing, fracture phenomenon, can reduce the degree of difficulty of adjusting straining device, extension hold-in range life simultaneously, reduce the routine maintenance cost of hold-in range. The synchronous belt transmission mechanism can realize the normal operation of the synchronous belt transmission mechanism by applying the tensioning mechanism.

Description

Tensioning mechanism and synchronous belt transmission mechanism

Technical Field

The utility model relates to a storage logistics technical field especially relates to a straining device and synchronous belt drive mechanism.

Background

In storage logistics technical field, can utilize synchronous belt drive mechanism to transport and promote the shuttle usually, synchronous belt drive mechanism includes synchronous pulley and hold-in range, synchronous pulley tensioning hold-in range drives synchronous belt drive, and the deformation that becomes long can take place for the hold-in range under long-time the use to lead to hold-in range and synchronous pulley to take place to jump the tooth or take off the tooth phenomenon, lead to the unable normal use of synchronous belt drive mechanism. Normally, two independent tensioning mechanisms arranged along the width direction of the synchronous belt are utilized to tension the synchronous belt, but the asynchronous condition is adjusted by the two tensioning mechanisms, so that the tension force or the tension quantity of two sides of the synchronous belt are inconsistent, the deviation can be generated when the synchronous belt runs, the edge of the synchronous belt is easy to wear or the synchronous belt is easy to break, and the normal running of a synchronous belt transmission mechanism and a logistics system is influenced.

Based on the above, the invention is urgently needed to provide a tensioning mechanism and a synchronous belt transmission mechanism, so as to solve the problems that the synchronous belt is off tracking, easy to wear, easy to break and influenced in normal operation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a straining device can realize the normal operating to synchronous belt drive mechanism, improve the life of hold-in range.

Another object of the utility model is to provide a synchronous belt drive mechanism, through using above-mentioned straining device, can realize synchronous belt drive mechanism's normal operating.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a tensioning mechanism comprising:

a mounting frame;

the tensioning wheel assembly is used for tensioning the synchronous belt and comprises a tensioning wheel shaft, and the tensioning wheel shaft is arranged on the mounting frame in a sliding manner;

the two rotating arms are respectively positioned on two sides of the mounting frame, one ends of the two rotating arms are fixedly connected and are pivoted with the mounting frame, and the other ends of the two rotating arms are respectively connected with two ends of the tensioning wheel shaft.

Preferably, the tension mechanism further comprises:

and the two ends of the pivoting shaft are respectively fixed with one ends of the two rotating arms far away from the tensioning wheel shaft.

Preferably, the mounting rack comprises a first side plate, a second side plate and a connecting rod, the first side plate and the second side plate are arranged in an aligned mode and at intervals, the first side plate and the second side plate are connected through the connecting rod, and two ends of the pivot shaft are respectively pivoted with the first side plate and the second side plate.

Preferably, the first side plate is provided with a first sliding groove, the second side plate is provided with a second sliding groove, two ends of the tensioning wheel shaft are respectively inserted into the first sliding groove and the second sliding groove, and the shapes of the first sliding groove and the second sliding groove are matched with the motion trail of the tensioning wheel shaft.

Preferably, the tension pulley includes a pulley body and a bearing, and the pulley body is connected to the tension pulley shaft through the bearing.

Preferably, the tension mechanism further comprises:

and the output end of the telescopic adjusting component is connected with any rotating arm so as to change the position of the tensioning wheel component.

Preferably, the telescopic adjustment assembly comprises:

the bidirectional screw nut is internally provided with a first threaded hole and a second threaded hole which have opposite rotation directions;

one end of the first screw rod is hinged with the mounting frame, and the other end of the first screw rod is screwed in the first threaded hole; and

and one end of the second screw is screwed in the second threaded hole, and the other end of the second screw is hinged with the rotating arm.

Preferably, the rotating arm is provided with a first circumferential limiting hole, the end of the tensioning wheel shaft is inserted into the first circumferential limiting hole, and the first circumferential limiting hole can limit the rotation of the tensioning wheel shaft relative to the rotating arm;

the tensioning wheel assembly further comprises a first axial limiting part, the first axial limiting part comprises a first limiting part and a first fixing part, the first limiting part and the first fixing part are connected, the first fixing part is fixedly connected with the end part of the tensioning wheel shaft, and the first limiting part is located on the outer side face of the rotating arm in an abutting mode.

Preferably, the rotating arm is provided with a second circumferential limiting hole, the end of the pivot shaft is inserted into the second circumferential limiting hole, and the second circumferential limiting hole can limit the pivot shaft to rotate relative to the rotating arm;

the tensioning wheel assembly further comprises a second axial limiting assembly, the second axial limiting assembly comprises a second limiting portion and a second fixing portion, the second limiting portion and the second fixing portion are connected, the second fixing portion is fixedly connected with the end portion of the pivot shaft, and the second limiting portion is located on the outer side face of the rotating arm in an abutting mode.

A synchronous belt transmission mechanism comprises a rack mounting plate, a driving wheel, a driven wheel and a synchronous belt, wherein the driving wheel and the driven wheel are rotatably arranged on the rack mounting plate, and the driving wheel and the driven wheel tension the synchronous belt together; the synchronous belt transmission mechanism further comprises the tensioning mechanism, and the tensioning wheel assembly is used for tensioning the synchronous belt.

The utility model has the advantages that:

the utility model provides a straining device is because two swinging booms pass through the take-up pulley hub connection, adjust the rotation of the relative mounting bracket of the swinging boom of arbitrary side, just can realize that the synchronous relative mounting bracket of swinging boom of opposite side rotates, according to the mechanics principle, the tightening pulley shaft is unanimous along the rotatory moment that the ascending both sides of hold-in range width direction received, just can guarantee that the take-up pulley subassembly is applyed and is evenly unanimous at the tensile force of synchronous belt along each position of width direction, avoid the hold-in range to take place the off tracking, wearing and tearing, the phenomenon of splitting, can reduce the degree of difficulty of adjusting straining device, prolong hold-in range life simultaneously, reduce the daily maintenance cost of hold-in range.

The utility model provides a synchronous belt drive mechanism through using above-mentioned straining device, can realize synchronous belt drive mechanism's normal operation.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a synchronous belt transmission mechanism provided in an embodiment of the present invention;

fig. 2 is a first schematic structural diagram of a tensioning mechanism provided by an embodiment of the present invention;

fig. 3 is a schematic structural diagram ii of a tensioning mechanism according to an embodiment of the present invention;

fig. 4 is an exploded view of a tensioning mechanism provided by an embodiment of the present invention.

The figures are labeled as follows:

100-a tensioning mechanism; 200-a rack mounting plate; 300-a driving wheel; 400-driven wheel; 500-synchronous belt;

1-a mounting frame; 11-a first side panel; 111-a first runner; 1111-a first opening; 12-a second side panel; 121-a second chute; 1211 — a second opening; 13-a connecting rod;

2-a tension wheel assembly; 21-a first axial stop; 211-a first stop; 212-a first fixed part; 22-a second axial stop assembly; 221-a second limiting part; 222-a second fixed part; 23-a tension pulley shaft; 24-a tensioner; 241-wheel body; 242-a bearing;

3-a telescopic adjustment assembly; 31-bidirectional screw; 32-a first screw; 33-a second screw;

4-a rotating arm; 41-a first circumferential limiting hole; 42-a second circumferential limit hole;

5-pivot axis.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, in order to realize transportation and promotion to the shuttle, current logistics system includes synchronous belt drive mechanism, synchronous belt drive mechanism can drive the shuttle transportation and promote, specifically speaking, synchronous belt drive mechanism includes frame mounting panel 200, action wheel 300, from driving wheel 400 and synchronous belt 500, action wheel 300 and from driving wheel 400 rotate and set up on frame mounting panel 200, synchronous belt 500 is tensioned jointly by action wheel 300 and driven wheel 400, action wheel 300 rotates and drives from driving wheel 400 and synchronous belt 500 and rotate, the shuttle that is connected with synchronous belt 500 just can realize corresponding motion.

However, in the long-term use of the synchronous belt transmission mechanism, the synchronous belt 500 may be deformed to be lengthened, so that the synchronous belt 500 and the driving wheel 300 or the driven wheel 400 may have a tooth skipping or tooth falling phenomenon, and the synchronous belt transmission mechanism may not be normally used.

In order to solve the above problem, the present embodiment provides a synchronous belt drive mechanism further including a tensioning mechanism 100, as shown in fig. 1, the tensioning mechanism 100 is disposed on the rack mounting plate 200, and the tensioning mechanism 100 is used for tensioning a synchronous belt 500.

As shown in fig. 2, the tensioning mechanism 100 includes an installation frame 1, a tensioning wheel assembly 2 and two rotating arms 4, the tensioning wheel assembly 2 is used for tensioning a belt and includes a tensioning wheel shaft 23, the tensioning wheel shaft 23 is slidably disposed on the installation frame 1, the two rotating arms 4 are respectively located at two sides of the installation frame 1, one ends of the two rotating arms 4 are fixedly connected and pivotally connected to the installation frame 1, and the other ends of the two rotating arms 4 are respectively connected to two ends of the tensioning wheel shaft 23. Because two swinging boom 4 are connected through tensioning shaft 23, adjust the rotation of the relative mounting bracket 1 of swinging boom 4 of arbitrary side, just can realize that the swinging boom 4 of opposite side is synchronous relative mounting bracket 1 and rotate, according to mechanics principle, tensioning shaft 23 is unanimous along the rotatory moment that 500 ascending both sides of hold-in range received, just can guarantee that take-up pulley subassembly 2 applies the even unanimity of tensile force in hold-in range 500 along each position of width direction, avoid hold-in range 500 to take place the off tracking, wearing and tearing, the phenomenon of splitting, can reduce the degree of difficulty of adjusting straining device, prolong hold-in range 500 life simultaneously, reduce hold-in range 500's daily maintenance cost.

In addition, in order to avoid the great friction of the tensioning wheel assembly 2 to the synchronous belt 500, thereby affecting the normal operation of the synchronous belt 500, as shown in fig. 2, the tensioning wheel assembly 2 further comprises a tensioning wheel 24, the tensioning wheel 24 rotates to penetrate through the periphery of the tensioning wheel shaft 23, the friction force of the tensioning wheel 24 relative to the synchronous belt 500 can be effectively reduced, and the normal operation of the synchronous belt 500 is ensured.

In order to realize the fixed connection of one end of the two rotating arms 4 and the pivot connection with the mounting frame 1, as shown in fig. 2, the tensioning mechanism further includes a pivot connection shaft 5, the pivot connection shaft 5 is pivot-connected with the mounting frame 1, and two ends of the pivot connection shaft 5 are respectively fixed with one end of each of the two rotating arms 4 far away from the tensioning wheel shaft 23.

In order to realize the more firm support of mounting bracket 1 to tensioning wheel subassembly 2, as shown in fig. 2, mounting bracket 1 includes first curb plate 11, second curb plate 12 and connecting rod 13, and first curb plate 11 and second curb plate 12 are just and the interval sets up, and first curb plate 11 and second curb plate 12 are connected through connecting rod 13, and the both ends of pin joint axle 5 are respectively with first curb plate 11 and the pin joint of second curb plate 12. The first side plate 11, the second side plate 12 and the connecting rod 13 can form a relatively stable frame structure, and the frame structure can realize relatively stable support for the pivot shaft 5, so that relatively stable support for the tensioning wheel assembly 2 is realized.

Preferably, in order to realize smooth rotation of the pivot shaft 5 relative to the first side plate 11 and the second side plate 12, a bearing or a bush is provided between the pivot shaft 5 and the first side plate 11, and a bearing or a bush is provided between the pivot shaft 5 and the second side plate 12.

Preferably, in order to avoid interference between the tension axle 23 and the mounting bracket 1, as shown in fig. 2 and 3, a first sliding groove 111 is formed in the first side plate 11, a second sliding groove 121 is formed in the second side plate 12, two ends of the tension axle 23 are respectively inserted into the first sliding groove 111 and the second sliding groove 121, and shapes of the first sliding groove 111 and the second sliding groove 121 are both matched with a movement track of the tension axle 23. When the rotating arm 4 rotates relative to the mounting frame 1, the tensioning axle 23 can slide in the first sliding groove 111 and the second sliding groove 121, so that the tensioning axle 23 can be effectively prevented from interfering with the mounting frame 1, and in addition, the first sliding groove 111 and the second sliding groove 121 can also play a certain guiding role in the movement of the tensioning axle 23.

Preferably, as shown in fig. 2 and 3, the first sliding groove 111 is formed with a first opening 1111 at an edge of the first side plate 11, the first opening 1111 has a width larger than a diameter of an end of the tension pulley shaft 23, the second sliding groove 121 is formed with a second opening 1211 at an edge of the second side plate 12, and the width of the second opening 1211 is larger than the diameter of the end of the tension pulley shaft 23. By setting the width of the first opening 1111 to be larger than the diameter of the end of the tension axle 23 and the width of the second opening 1211 to be larger than the diameter of the end of the tension axle 23, the tension axle 23 can be quickly put into the first sliding groove 111 or the second sliding groove 121, and the tension axle 23 is prevented from colliding with the mounting frame 1.

Now, referring to fig. 4, the structure of the tension pulley 24 is described, as shown in fig. 4, the tension pulley 24 includes a pulley body 241 and a bearing 242, and the pulley body 241 is connected to the tension pulley shaft 23 through the bearing 242, so that the pulley body 241 can rotate smoothly relative to the tension pulley shaft 23, and the pulley body 241 can be effectively prevented from being damaged.

In order to realize a better fixed connection between the tensioning axle 23 and the rotating arm 4, as shown in fig. 4, a first circumferential limiting hole 41 is formed in the rotating arm 4, an end of the tensioning axle 23 is inserted into the first circumferential limiting hole 41, and the first circumferential limiting hole 41 can limit the rotation of the tensioning axle 23 relative to the rotating arm 4. The tensioning wheel assembly 2 further comprises a first axial limiting part 21, the first axial limiting part 21 comprises a first limiting part 211 and a first fixing part 212 which are connected, the first fixing part 212 is fixedly connected with the end of the tensioning wheel shaft 23, the first limiting part 211 is located on the outer side surface of the rotating arm 4 in a butting manner, and the first axial limiting part 21 can limit the movement of the tensioning wheel shaft 23 relative to the rotating arm 4 along the circumferential direction, so that the tensioning wheel shaft 23 can be fixedly connected with the rotating arm 4 well.

Specifically, the first circumferential limiting hole 41 may be a kidney-shaped hole, a polygonal hole (such as a square hole), or the like, and the end of the tension pulley shaft 23 matches with the shape of the first circumferential limiting hole 41, so that the circumferential limiting function of the first circumferential limiting hole 41 on the tension pulley shaft 23 can be realized. Specifically, the first limiting portion 211 may be an annular gasket, the first fixing portion 212 may be a screw, a screw head of the screw is located outside the annular gasket, the screw penetrates through the annular gasket and is fixed to the tension wheel shaft 23, the annular gasket abuts against the outside of the rotating arm 4, and the screw is matched with the annular gasket, so that the axial limiting of the tension wheel shaft 23 and the rotating arm 4 can be achieved.

In order to realize a better fixed connection between the rotating arm 4 and the pivot shaft 5, as shown in fig. 4, a second circumferential limiting hole 42 is formed on the rotating arm 4, an end of the pivot shaft 5 is inserted into the second circumferential limiting hole 42, and the second circumferential limiting hole 42 can limit the rotation of the pivot shaft 5 relative to the rotating arm 4. The tensioning wheel component 2 further comprises a second axial limiting component 22, the second axial limiting component 22 comprises a second limiting portion 221 and a second fixing portion 222 which are connected, the second fixing portion 222 is fixedly connected with the end portion of the pivot shaft 5, the second limiting portion 221 is located on the outer side surface of the rotating arm 4 in an abutting connection, and the second axial limiting component 22 can limit the movement of the pivot shaft 5 relative to the rotating arm 4 along the circumferential direction, so that the pivot shaft 5 can be fixedly connected with the rotating arm 4 well.

Specifically, the second circumferential limiting hole 42 may be a kidney-shaped hole, a polygonal hole (such as a square hole), etc., and the end of the pivot shaft 5 matches with the shape of the second circumferential limiting hole 42, so that the function of circumferentially limiting the pivot shaft 5 by the second circumferential limiting hole 42 can be realized. Specifically, the second limiting portion 221 may be an annular spacer, the second fixing portion 222 may be a screw, a screw head of the screw is located outside the annular spacer, the screw penetrates through the annular spacer and is fixed to the pivot shaft 5, the annular spacer abuts against the outside of the rotating arm 4, and the screw is matched with the annular spacer, so that the pivot shaft 5 and the rotating arm 4 can be limited in the axial direction.

In order to adjust the rotating arms 4, as shown in fig. 2, the tensioning mechanism 100 further includes a telescopic adjusting assembly 3, and an output end of the telescopic adjusting assembly 3 is connected to any one of the rotating arms 4 to change the position of the tensioning wheel assembly 4. Referring to fig. 2 and 3, the structure of the telescopic adjusting assembly 3 will be described, as shown in fig. 2 and 3, the telescopic adjusting assembly 3 includes a bidirectional screw nut 31, a first screw rod 32 and a second screw rod 33, the bidirectional screw nut 31 has a first threaded hole and a second threaded hole with opposite rotation directions, one end of the first screw rod 32 is hinged to the mounting frame 1, the other end of the first screw rod 32 is screwed into the first threaded hole, one end of the second screw rod 33 is screwed into the second threaded hole, and the other end of the second screw rod 33 is hinged to the rotating arm 4. Through rotatory two-way nut 31, can realize that first screw rod 32 and second screw rod 33 are close to each other or keep away from each other, lead to this flexible adjusting part 3 just can realize the quick adjustment of flexible adjusting part 3 length through simple structure, make things convenient for operator's operation. In other embodiments, the telescopic adjusting assembly 3 may also be a telescopic cylinder or other structures capable of adjusting the length thereof.

It is noted that the basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (10)

1. A tensioning mechanism, comprising:

a mounting frame (1);

the tensioning wheel assembly (2) is used for tensioning the synchronous belt (500) and comprises a tensioning wheel shaft (23), and the tensioning wheel shaft (23) is arranged on the mounting frame (1) in a sliding mode;

the two rotating arms (4) are respectively located on two sides of the mounting frame (1), one ends of the two rotating arms (4) are fixedly connected and are pivoted with the mounting frame (1), and the other ends of the two rotating arms (4) are respectively connected with two ends of the tensioning wheel shaft (23).

2. The tensioning mechanism of claim 1, further comprising:

the pivoting shaft (5) is pivoted with the mounting frame (1), and two ends of the pivoting shaft (5) are respectively fixed with one ends, far away from the tensioning wheel shafts (23), of the two rotating arms (4).

3. The tensioning mechanism according to claim 2, characterized in that the mounting frame (1) comprises a first side plate (11), a second side plate (12) and a connecting rod (13), the first side plate (11) and the second side plate (12) are opposite and spaced, the first side plate (11) and the second side plate (12) are connected through the connecting rod (13), and two ends of the pivot shaft (5) are respectively pivoted with the first side plate (11) and the second side plate (12).

4. The tensioning mechanism according to claim 3, wherein a first sliding groove (111) is formed in the first side plate (11), a second sliding groove (121) is formed in the second side plate (12), two ends of the tensioning axle (23) are respectively inserted into the first sliding groove (111) and the second sliding groove (121), and shapes of the first sliding groove (111) and the second sliding groove (121) are matched with a movement track of the tensioning axle (23).

5. Tensioning mechanism according to claim 2, characterized in that the tensioning wheel assembly (2) further comprises a wheel body (241) and a bearing (242), the wheel body (241) being connected with the tensioning wheel shaft (23) by means of the bearing (242).

6. The tensioning mechanism of claim 2, further comprising:

the output end of the telescopic adjusting component (3) is connected with any rotating arm (4) so as to change the position of the tensioning wheel component (2).

7. Tensioning mechanism according to claim 6, characterized in that the telescopic adjustment assembly (3) comprises:

the bidirectional screw nut (31) is internally provided with a first threaded hole and a second threaded hole which have opposite rotation directions;

a first screw rod (32), one end of which is hinged with the mounting rack (1), and the other end of which is screwed in the first threaded hole; and

and one end of the second screw rod (33) is screwed in the second threaded hole, and the other end of the second screw rod is hinged with the rotating arm (4).

8. The tensioning mechanism according to claim 1, wherein the rotating arm (4) is provided with a first circumferential limiting hole (41), an end of the tensioning axle (23) is inserted into the first circumferential limiting hole (41), and the first circumferential limiting hole (41) can limit the rotation of the tensioning axle (23) relative to the rotating arm (4);

the tensioning wheel assembly (2) further comprises a first axial limiting part (21), the first axial limiting part (21) comprises a first limiting part (211) and a first fixing part (212) which are connected, the first fixing part (212) is fixedly connected with the end part of the tensioning wheel shaft (23), and the first limiting part (211) is located on the outer side face of the rotating arm (4) in a butting mode.

9. The tensioning mechanism according to claim 2, wherein a second circumferential limiting hole (42) is formed in the rotating arm (4), an end of the pivot shaft (5) is inserted into the second circumferential limiting hole (42), and the second circumferential limiting hole (42) can limit the pivot shaft (5) to rotate relative to the rotating arm (4);

tensioning wheel subassembly (2) still include spacing subassembly of second axial (22), spacing subassembly of second axial (22) is including the spacing portion of second (221) and second fixed part (222) that are connected, second fixed part (222) with the tip fixed connection of pin joint axle (5), spacing portion of second (221) is located the lateral surface looks butt of swinging boom (4).

10. A synchronous belt transmission mechanism is characterized by comprising a rack mounting plate (200), a driving wheel (300), a driven wheel (400) and a synchronous belt (500), wherein the driving wheel (300) and the driven wheel (400) are rotatably arranged on the rack mounting plate (200), and the driving wheel (300) and the driven wheel (400) tension the synchronous belt (500) together; the synchronous belt drive mechanism further comprises a tensioning mechanism according to any one of claims 1 to 9, the tensioning wheel assembly (2) being used for tensioning the synchronous belt (500).

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