Tightening machine of packing machine

Abstract

The utility model discloses a packing machine tightening machine, including drive module, intermediate speed reduction module and output module that connect in proper order, intermediate speed reduction module includes the first speed reduction subassembly and second speed reduction subassembly that are provided in the casing, the first speed reduction subassembly mainly includes first speed reduction frame, first gear set and first cog belt, and the second speed reduction subassembly includes second speed reduction frame, first gear set and first cog belt. The second speed reduction assembly is mainly composed of a second speed reduction frame, a second gear set and a second cog belt, the second gear set is connected with the first speed reduction frame, and torque is transmitted between the driving module and the output module through the first speed reduction assembly and the second speed reduction assembly. According to the technical scheme, the tightening machine of the packing machine has the advantages of being high in transmission efficiency, high in output torque and capable of achieving a large reduction ratio in a multi-stage gear speed reduction mode, the load of the driving module can be adjusted, work of the driving module is smoother, mechanical output energy is increased, and the tool efficiency and stability of the tightening machine of the packing machine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of baling machines, in particular to a baling machine tightening machine. Background Art

[0002] The strapping tightening machine is a special device that tightens the strapping strap tied to the packaged object (such as a box) to ensure that the strapping strap is stably tied to the packaged object.

[0003] The existing strapping tightening machine mainly includes a driving device, a power output mechanism linked to the driving device, and a tightening mechanism linked to the power output mechanism. The power output mechanism includes a worm and a worm wheel meshing with the worm, and the tightening mechanism includes a tightening base and a tightening handle linked to the worm wheel. Among them, the strapping tightening machine is in a limited space, and the driving device adopts an electric motor. Since the power of the electric motor is not high, the working efficiency when the worm wheel and the worm are driven by the electric motor does not meet the requirements, and the output torque is insufficient to drive the working machine. In order to ensure the safety of use and avoid overloading, the technicians at this stage urgently need to design a strapping tightening machine with high output torque and high working efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the working efficiency of the tightening machine in the prior art that uses an electric motor to drive the worm wheel and worm movement does not meet the requirements, the output torque is insufficient, and the working machinery cannot be driven, thereby providing a baling machine tightening machine with high transmission efficiency, high output torque, improved tooling efficiency and stability to meet the product use requirements.

[0005] In order to solve the above technical problems, the utility model provides a baler tightening machine, comprising a driving module, an intermediate deceleration module and an output module connected in sequence, wherein the intermediate deceleration module comprises:

[0006] A housing having a cylindrical mounting cavity;

[0007] A first reduction assembly, comprising a first reduction frame rotatably disposed in the housing, a first gear set rotatably disposed on the first reduction frame, and a first toothed belt disposed on the inner wall of the mounting cavity along a circumferential direction and meshingly connected with the first gear set, wherein the first gear set drives the first reduction frame to rotate when it moves along the trajectory of the first toothed belt under the drive of the driving module;

[0008] The second reduction assembly includes a second reduction frame coaxially rotatably arranged on the housing with the first reduction frame, a second gear set rotatably arranged on the second reduction frame, and a second toothed belt circumferentially arranged on the inner wall of the mounting cavity and meshingly connected with the second gear set. The second gear set is connected to the first reduction frame and drives the second reduction frame to rotate when it moves along the trajectory of the second toothed belt under the drive of the first reduction frame. The second reduction frame is connected to the output module, and torque is transmitted between the drive module and the output module through the first reduction assembly and the second reduction assembly.

[0009] In the above-mentioned baler tightening machine, the output module is installed at one end of the shell, and it includes a final-stage gear set connected to the second reduction frame. The final-stage gear set includes a connected worm wheel and a worm, and the worm and the second reduction frame form a coaxial linkage arrangement through a hole shaft structure or a spline structure.

[0010] In the above-mentioned baler tightening machine, the first reduction frame has a first cavity suitable for installing a first gear set, the first gear set includes at least two pinions arranged in the first cavity along a circumferential interval, and the at least two pinions are respectively meshed and connected with the first toothed belt. The driving module includes an electric motor installed at the other end of the shell, and a toothed drive shaft connecting the electric motor and the two pinions, and the electric motor drives the two pinions to move along the trajectory of the first toothed belt.

[0011] In the above-mentioned baler tightening machine, the first reduction frame includes two first shaft portions extending coaxially at both ends thereof, one of the first shaft portions is axially penetrated by a first shaft hole communicating with the first cavity, and the toothed drive shaft passes through the first shaft hole and extends into the first reduction frame to mesh with two pinions.

[0012] In the above-mentioned baler tightening machine, the first reduction frame includes two first shaft portions extending coaxially at its two ends, one of the first shaft portions is axially penetrated by a first shaft hole communicating with the first cavity, and the drive module includes a toothed drive shaft passing through the first shaft hole and meshing with two pinions.

[0013] In the above-mentioned baler tightener, another first shaft portion is axially extended to be provided with a first gear shaft penetrating into the second reduction frame, and the first gear shaft is connected to the second gear set for transmitting torque therebetween.

[0014] In the above-mentioned baler tightening machine, the second reduction frame has a second cavity suitable for installing the second gear set, the second gear set includes at least two double gears arranged in the second cavity along the circumferential direction, the at least two double gears are respectively meshed and connected with the second toothed belt, and the first gear shaft is respectively connected to the two double gears and drives the two pinions to move along the trajectory of the first toothed belt.

[0015] In the above-mentioned baler tightener, the second reduction frame includes two second shaft portions coaxially extending and arranged at both ends thereof, and one of the second shaft portions is axially penetrated by a second shaft hole for the first gear shaft to pass through.

[0016] In the above-mentioned baler tightener, a coupling hole is axially penetrated on the other second shaft portion, one end of the worm is installed in the coupling hole to form a coaxial linkage with the second reduction frame, and the cross-sectional shape of the coupling hole is a polygonal hole structure.

[0017] In the above-mentioned baler tightener, the toothed drive shaft, the first reduction frame, the second reduction frame and the worm are connected on the same axis, and a plurality of rolling bearings are respectively provided between the housing and the toothed drive shaft.

[0018] In the above-mentioned baler tightener, the electric motor is linked to the toothed drive shaft through a coupling, a one-way bearing is installed on one end of the worm connected to the second reduction frame, and a one-way bearing is installed on the rotating shaft of the electric motor.

[0019] The above technical solution of the utility model has the following advantages compared with the prior art:

[0020] 1. In the baler tightening machine provided by the utility model, torque is transmitted between the driving module and the output module through the first reduction assembly and the second reduction assembly. When the first gear group in the first reduction assembly moves along the trajectory of the first toothed belt under the drive of the driving module, it will drive the first reduction frame to rotate, so that the second gear group in the second reduction assembly moves along the trajectory of the second toothed belt under the drive of the first reduction frame, and drives the second reduction frame to rotate, and finally transmits the torque of the driving module to the output module through the second reduction frame to drive the mechanical work. This baler tightening machine adopts a multi-stage gear reduction method with the advantages of simple structure, high transmission efficiency and high output torque, and can achieve a larger reduction ratio. The first reduction assembly and the second reduction assembly adopt a transmission structure design of a star reducer to expand the transmission ratio, so that the load of the driving module can be adjusted to make it work more smoothly, thereby increasing the mechanical output energy, improving the performance and accuracy of the product, and improving the tooling efficiency and stability of the baler tightening machine to meet the product use requirements.

[0021] 2. In the baler tightening machine provided by the utility model, the second gear set is composed of two double gears rotatably arranged on the second reduction frame. Since the double gear has two coaxially linked gear parts, one of the gear parts is engaged with the second toothed belt, and the other gear part is engaged with the first gear shaft, so that power is transmitted between the first reduction frame and the second reduction frame through the double gear. With this structural arrangement, the transmission efficiency of the double gear is relatively high, and a faster speed and a greater torque can be achieved. It also maintains good transmission efficiency and stability during use, thereby greatly improving the efficiency and productivity of the baler tightening machine.

[0022] 3. In the baler tightening machine provided by the utility model, a coupling hole is penetrated through the second shaft portion of the second reduction frame, and one end of the worm is installed in the coupling hole to form a coaxial linkage with the second reduction frame. The cross-sectional shapes of the coupling hole and the worm are respectively designed to be matching polygonal structures, which can prevent slipping between the worm and the second reduction frame. This design transmits torque to the worm and worm wheel through multi-stage gear transmission, and further realizes speed change and torque increase with the help of the transmission cooperation of the final stage worm and worm wheel, and changes the transmission direction of force, thereby driving the mechanical part of the tightening machine to tighten and achieve greater output torque.

[0023] 4. In the baler tightening machine provided by the utility model, a one-way bearing is installed on one end of the worm and a one-way bearing is installed on the rotating shaft of the electric motor. The outer peripheral portion of the one-way bearing is mounted and contacted with the housing. This structural arrangement limits the worm and the motor shaft to one-way rotation when driven by force through the one-way bearing, and avoids reverse rotation, thereby preventing the tightening machine from rebounding when tightening the strapping belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the baler tightening machine provided by the utility model;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the tightening machine of the baler of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the first reduction assembly and the second reduction assembly of the utility model;

[0028] Figure 4 It is a schematic cross-sectional structure diagram of the intermediate deceleration module of the utility model;

[0029] Explanation of the accompanying drawings: a, drive module; b, intermediate reduction module; c, output module; 1, first reduction assembly; 11, first reduction frame; 12, pinion; 13, first toothed belt; 14, first shaft; 15, first gear shaft; 2, second reduction assembly; 21, second reduction frame; 22, double gear; 23, second toothed belt; 24, second shaft; 25, coupling hole; 3, housing; 4, worm gear; 5, worm; 6, electric motor; 61, coupling; 7, toothed drive shaft; 8, rolling bearing; 9, one-way bearing. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Example

[0035] This embodiment provides Figure 1-4A baler tightening machine shown in the figure comprises a driving module a, an intermediate deceleration module b and an output module c which are connected in sequence, wherein the intermediate deceleration module b comprises:

[0036] The housing 3 has a cylindrical mounting cavity;

[0037] The first reduction assembly 1 comprises a first reduction frame 11 rotatably arranged in the housing 3, a first gear set rotatably arranged on the first reduction frame 11, and a first toothed belt 13 circumferentially arranged on the inner wall of the mounting cavity and meshingly connected with the first gear set, wherein the first gear set drives the first reduction frame 11 to rotate when it moves along the trajectory of the first toothed belt 13 under the drive of the driving module a;

[0038] The second reduction gear assembly 2 includes a second reduction gear frame 21 which is coaxially rotatably arranged on the housing 3 with the first reduction gear frame 11, a second gear set which is rotatably arranged on the second reduction gear frame 21, and a second toothed belt 23 which is circumferentially arranged on the inner wall of the mounting cavity and meshed with the second gear set. The second gear set is connected to the first reduction gear frame 11 and drives the second reduction gear frame to rotate when it moves along the trajectory of the second toothed belt under the drive of the first reduction gear frame 11. The second reduction gear frame is connected to the output module c and transmits torque between the drive module a and the output module c through the first reduction gear assembly 1 and the second reduction gear assembly 2.

[0039] In the above embodiment, torque is transmitted between the driving module and the output module through the first reduction assembly 1 and the second reduction assembly 2. When the first gear group in the first reduction assembly 1 moves along the trajectory of the first toothed belt 13 under the drive of the driving module, it will drive the first reduction frame 11 to rotate, so that the second gear group in the second reduction assembly 2 moves along the trajectory of the second toothed belt under the drive of the first reduction frame 11, and drives the second reduction frame to rotate, and finally transmits the torque of the driving module a to the output module c through the second reduction frame to drive the mechanical work. This baler tightening machine adopts a multi-stage gear reduction method with the advantages of simple structure, high transmission efficiency and high output torque, and can achieve a larger reduction ratio. The first reduction assembly 1 and the second reduction assembly 2 adopt a transmission structure design of a star reducer to expand the transmission ratio, so that the load of the driving module can be adjusted to make it work more smoothly, thereby increasing the mechanical output energy, improving the performance and accuracy of the product, and improving the tooling efficiency and stability of the baler tightening machine.

[0040] As a preferred embodiment, the output module c is mounted at one end of the housing 3, and includes a final gear set connected to the second reduction frame, the final gear set includes a connected worm wheel 4 and a worm 5, and the worm 5 and the second reduction frame form a coaxial linkage arrangement through a hole-shaft structure, refer to Figure 3-4The shaft hole structure is provided with a coupling hole 25 on one end of the second reduction frame, and the cross-sectional shape of the coupling hole 25 is a polygonal hole structure, corresponding to one end of the worm 5 being set as a polygonal structure. Preferably, the coupling hole 25 is a hexagonal shaft hole, and the cross-sectional shapes of the coupling hole 25 and the worm 5 are respectively designed to be matching polygonal structures, so as to prevent slipping between the worm 5 and the second reduction frame. The baler tightening machine of this embodiment transmits the torque to the worm 5 and the worm wheel 4 through a multi-stage gear transmission, and further realizes speed change and torque increase with the help of the transmission cooperation of the final stage worm and worm wheel, and changes the transmission direction of the force, thereby driving the mechanical part of the tightening machine to tighten and achieve greater output torque.

[0041] As an alternative to the above, a spline structure can be used between the worm 5 and the second reduction frame to form a coaxial linkage setting. Specifically, the spline structure includes a spline groove arranged at one end of the second reduction frame, and a spline block correspondingly arranged at one end of the worm 5 and cooperating with the spline groove, so as to realize the linkage cooperation between the worm 5 and the second reduction. Those skilled in the art can make a choice of the specific setting method of the worm and the second reduction frame according to the above description, and will not be repeated here one by one.

[0042] Combine the following Figure 1-4 The specific configuration of the first reduction assembly and the second reduction assembly is described in detail:

[0043] The first reduction frame 11 has a first cavity suitable for installing the first gear set. The first gear set includes two pinions 12 arranged in the first cavity at intervals along the circumferential direction. The two pinions 12 are respectively meshed and connected with the first toothed belt 13. The driving module a includes an electric motor 6 installed at the other end of the housing, and a toothed drive shaft 7 connecting the electric motor and the two pinions. The electric motor 6 drives the two pinions to move along the trajectory of the first toothed belt, and the two pinions 12 drive the first reduction frame 11 to rotate during the circular motion. As a specific structural setting, the first reduction frame 11 includes two first shaft portions 14 extending coaxially at both ends thereof, one of the first shaft portions 14 is axially penetrated with a first shaft hole connected to the first cavity, and the toothed drive shaft passes through the first shaft hole and extends into the first reduction frame to mesh with the two pinions. Among them, the other first shaft portion 14 is axially extended with a first gear shaft 15 penetrating into the second reduction frame, and the first gear shaft 15 is connected to the second gear set for transmitting torque between the two. This first reduction assembly 1 forms a planetary gear transmission structure through the pinion 12, the first toothed belt 13 and the first reduction frame 11, which has the characteristics of small size, large transmission ratio, large load-bearing capacity, smooth transmission and high transmission efficiency. It can effectively reduce the rotation speed and increase the torque, thereby realizing the conversion of the torque output by the drive module into the rotational motion of the first reduction frame 11, and then transmitting the torque of the first reduction frame to the second reduction frame through the first gear shaft.

[0044] Combination Figure 2-4As shown, the second reduction frame has a second cavity suitable for installing the second gear set, and the second gear set includes two double gears 22 arranged in the second cavity at intervals along the circumferential direction, the two double gears 22 are respectively meshed and connected with the second toothed belt 23, and the first gear shaft 15 is respectively connected to the two double gears 22. It is further preferably configured that the second reduction frame includes two second shaft portions 24 extending coaxially at both ends thereof, one of the second shaft portions 24 is axially penetrated by a second shaft hole for the first gear shaft 15 to pass through, and the other second shaft portion is axially penetrated by a coupling hole 25, one end of the worm 5 is installed in the coupling hole 25 to form a coaxial linkage with the second reduction frame, at this time, the second reduction frame and the worm 5 are connected by a hole-shaft structure; or a spline groove is provided on the other second shaft portion, and one end of the worm 5 provided with a spline block is correspondingly inserted into the spline groove, that is, the second reduction frame and the worm 5 are connected by a spline structure. In this structural arrangement, when the first reduction frame 11 rotates under the drive of the driving module a, the two double gears 22 are driven to move along the trajectory of the first toothed belt 13 through the first gear shaft 15, so that the two double gears 22 drive the second reduction frame to rotate during the circular motion, and finally the worm 5 and the worm wheel 4 are driven to rotate through the second reduction frame. Since the tightening mechanism of the tightening machine is connected to the turbine shaft, the tightening work of the tightening machine is realized.

[0045] It can be seen from the above structure that the second gear set is composed of two double gears 22 rotatably arranged on the second reduction frame. Since the double gear 22 has two coaxially linked gear parts, one of the gear parts is engaged with the second toothed belt 23, and the other gear part is engaged with the first gear shaft 15, so that power is transmitted between the first reduction frame 11 and the second reduction frame through the double gear 22. With this structural arrangement, the transmission efficiency of the double gear 22 is relatively high, which can achieve faster speed and greater torque, and maintain good transmission efficiency and stability during use, thereby greatly improving the efficiency and productivity of the baler tightening machine.

[0046] As a preferred embodiment, refer to Figure 3-4 The cross-sectional shape of the coupling hole 25 is a polygonal hole structure, and one end of the corresponding worm 5 is set to a polygonal structure. Preferably, the coupling hole 25 is a hexagonal shaft hole. The cross-sectional shapes of the coupling hole 25 and the worm 5 are respectively designed to be matching polygonal structures, so as to prevent the worm 5 from slipping with the second reduction frame. The packer tightening machine of this embodiment transmits the torque to the worm 5 and the worm wheel 4 through multi-stage gear transmission, and further realizes speed change and torque increase by means of the transmission cooperation of the final stage worm 5 and the worm wheel 4, and changes the transmission direction of the force, thereby driving the mechanical part of the tightening machine to tighten and achieve greater output torque.

[0047] In this embodiment, if Figure 3 As shown, the toothed drive shaft 7, the first reduction frame 11, the second reduction frame and the worm 5 are connected on the same axis, and a plurality of rolling bearings 8 are provided between the housing 3 respectively. The rolling bearings 8 support the rotation, thereby reducing friction, making the rotation smoother and reducing energy consumption.

[0048] It is further preferred that the electric motor 6 is linked to the toothed drive shaft 7 through a coupling 61, a one-way bearing 9 is installed on one end of the worm 5 connected to the second reduction frame, and a one-way bearing 9 is installed on the rotating shaft of the electric motor 6, and the outer peripheral portion of the one-way bearing is mounted and contacted with the housing. This structural arrangement limits the worm and the motor shaft to one-way rotation when driven by force through the one-way bearing, and avoids reverse rotation, thereby preventing the tightening machine from rebounding when tightening the binding belt.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A packing machine tightening machine, comprising a driving module (a), an intermediate deceleration module (b) and an output module (c) connected in sequence, characterized in that: The intermediate deceleration module (b) comprises: A housing (3) having a cylindrical mounting cavity; A first reduction assembly (1), comprising a first reduction frame (11) rotatably arranged in a housing (3), a first gear set rotatably arranged on the first reduction frame (11), and a first toothed belt (13) circumferentially arranged on the inner wall of the mounting cavity and meshingly connected with the first gear set, wherein the first gear set drives the first reduction frame (11) to rotate when it moves along the trajectory of the first toothed belt (13) under the drive of the driving module (a); The second reduction gear assembly (2) comprises a second reduction gear frame (21) coaxially rotatably arranged on the housing (3) with the first reduction gear frame (11), a second gear set rotatably arranged on the second reduction gear frame (21), and a second toothed belt (23) circumferentially arranged on the inner wall of the mounting cavity and meshingly connected with the second gear set, wherein the second gear set is connected to the first reduction gear frame (11) and drives the second reduction gear frame to rotate when it moves along the trajectory of the second toothed belt under the drive of the first reduction gear frame (11), and the second reduction gear frame is connected to the output module (c) to transmit torque between the drive module (a) and the output module (c) through the first reduction gear assembly (1) and the second reduction gear assembly (2).

2. A baler tightening machine according to claim 1, characterized in that The output module is mounted at one end of the housing (3), and comprises a final gear set connected to a second reduction frame, the final gear set comprising a worm wheel (4) and a worm (5) connected to each other, and a coaxial linkage arrangement is formed between the worm (5) and the second reduction frame via a hole-shaft structure or a spline structure.

3. A baler tightening machine according to claim 2, characterized in that The first reduction frame (11) has a first cavity suitable for installing a first gear set, the first gear set includes at least two pinions (12) arranged in the first cavity along a circumferential interval, and the at least two pinions (12) are respectively meshed and connected with the first toothed belt (13); the drive module (a) includes an electric motor (6) installed at the other end of the housing (3), and a toothed drive shaft (7) connecting the electric motor and the two pinions.

4. A baler tightening machine according to claim 3, characterized in that The first reduction frame (11) comprises two first shaft portions (14) extending coaxially at both ends thereof, one of the first shaft portions (14) being axially penetrated by a first shaft hole communicating with the first cavity, and the toothed drive shaft (7) passing through the first shaft hole extends into the first reduction frame and meshes with the two pinions (12).

5. A baler tightening machine according to claim 4, characterized in that Another first shaft portion (14) is axially extended to be provided with a first gear shaft (15) penetrating into the second reduction frame, and the first gear shaft (15) is connected to the second gear set for transmitting torque therebetween.

6. A baler tightening machine according to claim 5, characterized in that The second reduction frame has a second cavity suitable for installing a second gear set, the second gear set includes at least two double gears (22) arranged in the second cavity along a circumferential interval, the at least two double gears (22) are respectively meshed and connected with the second toothed belt (23), and the first gear shaft (15) is respectively connected to the two double gears (22) and drives the two pinions (12) to move along the trajectory of the first toothed belt (13).

7. A baler tightening machine according to claim 6, characterized in that The second reduction frame comprises two second shaft portions (24) extending coaxially at both ends thereof, and one of the second shaft portions (24) is axially penetrated by a second shaft hole through which the first gear shaft (15) can pass.

8. A baler tightening machine according to claim 7, characterized in that A coupling hole (25) is provided on the other second shaft portion along the axial direction, one end of the worm (5) is installed in the coupling hole (25) to form a coaxial linkage with the second reduction frame, and the cross-sectional shape of the coupling hole (25) is a polygonal hole structure.

9. A baler tightening machine according to claim 8, characterized in that The toothed drive shaft (7), the first reduction frame (11), the second reduction frame and the worm (5) are connected on the same axis and are provided with a plurality of rolling bearings (8) between them and the housing (3).

10. The baler tightener according to claim 3, characterized in that The electric motor (6) is linked to the toothed drive shaft (7) via a coupling (61); a one-way bearing (9) is installed on one end of the worm (5) connected to the second reduction frame; and a one-way bearing (9) is installed on the rotating shaft of the electric motor (6).

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