Reducing mechanism for tightening machine

Abstract

The utility model discloses a reducing mechanism for tightening machine, including the drive structure that sets up in the casing, first gear subassembly and output subassembly, the first gear subassembly includes idling frame, planetary gear and outer gear sleeve, planetary gear center rotatingly passes through the gear shaft, gear shaft both ends are connected in the connecting hole of idling frame both ends respectively, the outer gear sleeve passes through the gear shaft, the end, extending out of the connecting hole, of the gear shaft is provided with the limiting step, one end of the idling frame is provided with the limiting gasket which abuts against the limiting step in a matched mode and is used for limiting idling of the gear shaft, and therefore when the planetary gear rotates, the gear shaft can be in a relatively static state under the limiting effect of the limiting gasket, and the idling phenomenon cannot be caused; in this way, abrasion between the gear shaft and the idling frame can be avoided, the transmission error of the planetary gear is reduced, the accuracy and stability of gear transmission are guaranteed, and the use performance of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of baling machines, in particular to a speed reduction mechanism for a 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 tightening mechanism includes a tightening base and a tightening handle linked to the worm gear. The power output mechanism includes a worm gear assembly and a reduction mechanism connected between the worm gear assembly and the driving device. The reduction mechanism includes an idle frame and a transmission gear rotatably arranged on the idle frame, and an external gear sleeve sleeved on the outside of the idle member and meshing with the transmission gear. A gear shaft is passed through the transmission gear, and both ends of the gear shaft are connected to the connecting holes at both ends of the idle frame. When the transmission gear is driven to rotate by the driving device, the gear shaft will be driven to idle under the action of friction. Long-term use will cause wear between the gear shaft and the idle frame, increase the matching clearance, and thus cause transmission error in the mutually meshing gear pair, which has a great influence on the transmission accuracy of the transmission gear, shortens the service life, and affects the product performance. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that when the transmission gear rotates on the idler frame, the gear shaft will be driven to idle, and long-term use will cause wear between the gear shaft and the idler frame, increase the matching clearance, and have a great impact on the gear transmission accuracy.

[0005] In order to solve the above technical problems, the utility model provides a reduction mechanism for a tightening machine, including a driving structure, a first gear assembly and an output assembly which are connected to each other and are arranged on a shell body, the first gear assembly including an idler frame having an accommodating cavity and at least one planetary gear rotatably arranged in the accommodating cavity, and an outer gear sleeve fixedly surrounded by the outer side of the idler frame and forming a meshing transmission with the planetary gear, a gear shaft is pierced through the center rotation of the planetary gear, and the two ends of the gear shaft are respectively connected to the connecting holes at the two ends of the idler frame, a limiting step is provided at one end of the gear shaft extending out of the connecting hole, and a limiting gasket is provided at one end of the idler frame which cooperates and abuts against the limiting step to limit the idling of the gear shaft, and the planetary gear drives the idler frame to rotate when meshing transmission with the outer gear sleeve.

[0006] As a preferred solution, two planetary gears are provided in parallel on the idler frame and are respectively rotated around two gear shafts in the accommodating cavity. The limiting gasket is a circular structure, and one end of the two gear shafts is respectively abutted against the outer peripheral edge of the limiting gasket through two limiting steps.

[0007] As a preferred solution, the outer gear sleeve is fixed in the housing and has a rotation gap with the idler frame, and an annular rack belt meshing with the two planetary gears is circumferentially arranged on the inner wall of the outer gear sleeve.

[0008] As a preferred solution, the driving structure includes a driving gear shaft extending from the other end of the idler frame into the accommodating cavity, and the driving gear shaft is meshingly connected with two planetary gears.

[0009] As a preferred solution, the idle frame is cylindrical in shape and is provided with a first connecting shaft and a second connecting shaft with a hollow structure at both ends. The limit gasket is sleeved on the first connecting shaft. The first connecting shaft is provided with a limit stopper for preventing the limit gasket from axially disengaging from the connecting shaft, and the driving gear shaft rotates through the second connecting shaft.

[0010] As a preferred solution, the output assembly includes a worm wheel and a worm that are meshed and connected, and one end of the worm is inserted into the first connecting shaft to form a linkage fit for transmitting torque.

[0011] As a preferred embodiment, the worm gear includes a worm gear body and a worm gear shaft that are detachably connected, the worm gear body having a coaxially arranged coupling portion, and a worm gear shaft hole that penetrates the worm gear body and the coupling portion along the axial direction of the worm gear body, one end of the worm gear shaft is connected to the worm gear shaft hole and forms a linkage fit with the worm gear body, and the shapes of the worm gear shaft hole and the worm gear shaft are respectively matching polygonal structures.

[0012] As a preferred solution, at least one first bearing is provided between the worm and the housing, at least one second bearing is provided between the worm gear shaft and the housing, and the other end of the worm gear shaft extends out of the housing.

[0013] As a preferred solution, a third bearing is installed on the first connecting shaft, and the limiting stopper is the third bearing, so that the limiting gasket is installed between the third bearing and the idle frame.

[0014] As a preferred solution, a mounting sleeve sleeved on the third bearing is provided in the housing, and the external gear sleeve is fixedly connected to the mounting sleeve.

[0015] The above technical solution of the utility model has the following advantages compared with the prior art:

[0016] 1. The utility model provides a reduction mechanism for a tightening machine, wherein a first gear assembly comprises an idler frame, a planetary gear and an outer gear sleeve, wherein the planetary gear is connected to the idler frame through a gear shaft, so that the planetary gear rotates around the gear shaft in the accommodating cavity of the idler frame. A limiting step extending out of the idler frame is provided on one end of the gear shaft, and a limiting gasket that cooperates and abuts against the limiting step is provided on one end of the idler frame. The advantage of adopting this structural design is that a limiting cooperation is formed by the limiting gasket and the limiting step to limit the rotation of the idler frame. In this way, when the planetary gear rotates under the drive of the driving structure, the gear shaft can be in a relatively static state under the limiting action of the limiting gasket, and idling will not occur. In this way, wear between the gear shaft and the idler frame can be avoided, the transmission error of the planetary gear can be reduced, the accuracy and stability of the gear transmission can be ensured, and the product performance can be improved.

[0017] 2. The utility model provides a speed reduction mechanism for a tightening machine, in which two planetary gears are rotatably connected in the accommodating cavity of the idling frame through two gear shafts. Since the limiting gasket is a circular structure, one end of the two gear shafts is respectively abutted against the outer peripheral edge of the limiting gasket through two limiting steps. With this structural arrangement, a limiting gasket can simultaneously limit the two gear shafts to ensure that the planetary gears will not cause the gear shafts to idle when being driven to rotate.

[0018] 3. The utility model provides a reduction mechanism for a tightening machine, in which a rotation gap is left between the outer gear sleeve and the idler frame, so that they do not interfere with each other's movement. An annular rack belt meshing with two planetary gears is circumferentially arranged on the inner wall of the outer gear sleeve. With this structural arrangement, when the driving gear shaft drives the two planetary gears to rotate, the two planetary gears move along the circumferential trajectory of the annular rack belt and drive the idler frame to rotate. According to the coaxial linkage arrangement of the idler frame and the worm, the worm wheel and the worm are driven to move through the idler frame, and finally the output torque of the worm wheel and the worm is used to drive the mechanical work. The reduction mechanism of the tightening machine adopts a planetary gear design for the first gear assembly, which has the characteristics of small size, large load-bearing capacity and stable operation, which is conducive to reducing the product volume, and plays the role of reducing speed and increasing transmission torque, thereby improving the load capacity of the tightening machine.

[0019] 4. The utility model provides a speed reduction mechanism for a tightening machine, in which the worm wheel is composed of a worm wheel body and a worm wheel shaft. A worm wheel shaft hole is provided on the worm wheel body along its axial direction, and one end of the worm wheel shaft is inserted into the worm wheel shaft hole to achieve a coaxial connection with the worm wheel body. A polygonal structure design can be adopted according to the worm wheel shaft hole and the worm wheel shaft, so that the worm wheel body and the worm wheel shaft form a coaxial linkage after assembly to prevent slipping between the two. This worm wheel adopts a split structure design, which is convenient and quick to install, reduces the difficulty of the forming and forging process, shortens the processing cycle, and avoids excessive waste of raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A three-dimensional structural schematic diagram of a speed reduction mechanism for a tightening machine is provided for the utility model;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of the speed reduction mechanism of the utility model;

[0023] Figure 3 It is a schematic diagram of the connection structure between the first gear assembly and the output assembly of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the idler frame and the planetary gear of the utility model;

[0025] Figure 5 It is a schematic diagram of the connection structure of the gear shaft on the idler frame of the utility model;

[0026] Figure 6 It is a schematic diagram of the exploded structure of the worm gear of the utility model;

[0027] Explanation of the reference numerals: 1. housing; 11. first bearing; 12. second bearing; 13. third bearing; 14. mounting bushing; 2. idler frame; 21. first connecting shaft; 22. second connecting shaft; 3. planetary gear; 4. external gear sleeve; 41. annular rack belt; 5. gear shaft; 51. limiting step; 6. limiting gasket; 7. worm; 8. worm wheel; 81. worm wheel body; 82. worm wheel shaft; 83. coupling part; 84. worm wheel shaft hole; 9. driving gear shaft. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Example

[0033] This embodiment provides Figure 1-6 A reduction mechanism for a tightening machine shown in the figure includes a driving structure, a first gear assembly and an output assembly which are connected to and arranged in a housing 1. The first gear assembly includes an idler frame 2 with an accommodating cavity and at least one planetary gear 3 rotatably arranged in the accommodating cavity, and an outer gear sleeve 4 fixedly surrounded by the outer side of the idler frame 2 and forming a meshing transmission with the planetary gear 3. A gear shaft 5 is rotatably penetrated by the center of the planetary gear 3. The two ends of the gear shaft 5 are respectively connected to the connecting holes at the two ends of the idler frame 2. A limiting step 51 is provided at one end of the gear shaft 5 extending out of the connecting hole. A limiting gasket 6 which cooperates and abuts against the limiting step 51 and is used to limit the idling of the gear shaft 5 is provided at one end of the idler frame 2. The driving structure is used to drive the planetary gear 3 to rotate. When the planetary gear 3 is meshed with the outer gear sleeve 4 for transmission, the idler frame 2 is driven to rotate.

[0034] The above implementation mode is the core technical scheme of the present embodiment. The first gear assembly is mainly composed of an idler frame 2, a planetary gear 3 and an outer gear sleeve 4. The planetary gear 3 is connected to the idler frame 2 through a gear shaft 5, so that the planetary gear 3 rotates around the gear shaft 5 in the accommodating cavity of the idler frame 2. A limiting step 51 extending out of the idler frame 2 is provided on one end of the gear shaft 5, and a limiting gasket 6 is provided on one end of the idler frame 2 to cooperate with the limiting step 51. The advantage of adopting this structural design is that a limiting fit is formed by the limiting gasket 6 and the limiting step 51 to limit the rotation of the idler frame 2. In this way, when the planetary gear 3 is driven to rotate by the driving structure, the gear shaft 5 can be in a relatively static state under the limiting action of the limiting gasket 6, and idling will not occur. In this way, wear between the gear shaft and the idler frame can be avoided, the transmission error of the planetary gear is reduced, the accuracy and stability of the gear transmission are guaranteed, and the product performance is improved.

[0035] As a preferred embodiment, two planetary gears 3 are provided in parallel on the idler frame 2, and are respectively arranged to rotate around two gear shafts 5 in the accommodating cavity, and the limiting gasket 6 is a circular structure, and one end of the two gear shafts 5 abuts against the outer peripheral edge of the limiting gasket 6 through two limiting steps 51. With this structural setting, one limiting gasket 6 can simultaneously limit the two gear shafts 5, so as to ensure that the planetary gear 3 will not cause the gear shaft 5 to idle when being driven to rotate.

[0036] Combination Figure 2-3 As shown, the outer gear sleeve 4 is fixed in the housing 1 and a rotation gap is left between the outer gear sleeve 4 and the idler frame 2, so that the positions of the outer gear sleeve 4 and the idler frame 2 do not interfere with each other. The inner wall of the outer gear sleeve 4 is provided with an annular rack belt 41 meshing with the two planetary gears 3 along the circumferential direction. It is further preferably provided that the driving structure is preferably an electric motor, which includes a driving gear shaft 9 extending from the other end of the idler frame 2 into the accommodating cavity, and the driving gear shaft 9 is meshed and connected with the two planetary gears 3. The output assembly is a worm gear assembly that cooperates with the idler frame 2. With this structural arrangement, when the electric motor drives the two planetary gears 3 to rotate, the two planetary gears 3 move along the circumferential trajectory of the annular rack belt 41, thereby driving the idler frame to rotate, and the torque of the electric motor is transmitted to the worm gear assembly through the idler frame. The cooperation of the planetary gears, the annular rack belt and the idler frame can adjust the load of the electric motor, reduce its load, and make the work smoother.

[0037] As a specific structural setting, the idle frame 2 is cylindrical and has a first connecting shaft 21 and a second connecting shaft 22 with a hollow structure at both ends. The limit gasket 6 is sleeved on the first connecting shaft 21, and the first connecting shaft 21 is provided with a limit stopper for preventing the limit gasket 6 from axially disengaging from the connecting shaft. The driving gear shaft 9 rotates through the second connecting shaft 22 and is meshed and connected between the two planetary gears 3, wherein the output assembly includes a meshing worm wheel 8 and a worm 7, one end of the worm 7 is inserted into the first connecting shaft 21 to form a linkage fit for transmitting torque, specifically, a hexagonal shaft hole is provided in the first connecting shaft 21, and one end of the worm 7 is a hexagonal structure. The shaft end of the structure, this structural arrangement, when the two planetary gears 3 move in a circular trajectory along the annular rack belt 41 under the drive of the electric motor, drive the idle frame 2 to rotate. According to the coaxial linkage arrangement of the idle frame 2 and the worm 7, the idle frame 2 drives the worm wheel 8 and the worm 7 to rotate, and finally the output torque of the worm wheel 8 and the worm 7 is used to drive the mechanical work. The reduction mechanism of this tightening machine adopts the planetary gear 3 design for the first gear assembly, which has the characteristics of small size, large load-bearing capacity and stable operation, which is conducive to reducing the product volume, and plays the role of reducing speed and increasing transmission torque, improving the load capacity of the tightening machine, which can increase the mechanical output energy, thereby improving the performance and accuracy of the product.

[0038] In this embodiment, combined with Figure 3 and Figure 6 As shown, the worm wheel 8 includes a detachably connected worm wheel body 81 and a worm wheel shaft 82, the worm wheel body 81 having a coaxially arranged coupling portion 83, and a worm wheel shaft hole 84 extending between the worm wheel body 81 and the coupling portion 83 along the axial direction of the worm wheel body 81, one end of the worm wheel shaft 82 is connected to the worm wheel shaft hole and forms a linkage with the worm wheel body 81, and the shapes of the worm wheel shaft hole 82 and the worm wheel shaft 82 are respectively matched polygonal structures, and the worm wheel shaft hole can be preferably set as a square hole, and one end of the worm wheel shaft is set to match the square hole. The worm wheel 8 is composed of a worm wheel body 81 and a worm wheel shaft 82. One end of the worm wheel shaft 82 is inserted into the worm wheel shaft hole to achieve a coaxial connection with the worm wheel body 81. A polygonal structure design can be adopted according to the worm wheel shaft hole and the worm wheel shaft 82. In this way, the worm wheel body 81 and the worm wheel shaft 82 form a coaxial linkage after being assembled to prevent slipping between the two. This worm wheel adopts a split structure design, which is convenient and quick to install, reduces the difficulty of the forming and forging process, shortens the processing cycle, and avoids excessive waste of raw materials.

[0039] like Figure 1-2As shown, at least one first bearing 11 is arranged between the worm 7 and the housing 1, and at least one second bearing 12 is arranged between the worm wheel shaft 82 and the housing 1. A round shaft portion connected to the second bearing is arranged on one end of the worm shaft passing through the worm wheel, and the other end of the worm wheel shaft 82 extends out of the housing 1 for connecting to a tightening mechanism. The first bearing 11 and the second bearing 12 are used to guide and support the rotation of the worm wheel 8 and the worm 7, thereby reducing friction, making the rotation smoother and reducing energy consumption.

[0040] It is further preferably arranged that a third bearing 13 is installed on the first connecting shaft 21, and a mounting sleeve 14 is arranged in the housing 1 and is sleeved on the third bearing 13, and the external gear sleeve 4 is fixedly connected to the mounting sleeve 14, so that the third bearing 13 plays a role of rotational support for the idling part in the housing 1, and according to the limit stopper being the third bearing 13, the limit gasket 6 is limitedly installed between the third bearing 13 and the idling frame 2, so that after the optimized design, the third bearing 13 also plays a role of limiting the installation of the limit gasket 6.

[0041] 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 speed reduction mechanism for a tightening machine, comprising a driving structure, a first gear assembly and an output assembly which are connected and arranged in a transmission manner on a housing (1), wherein the first gear assembly comprises an idler frame (2) having an accommodating cavity and at least one planetary gear (3) rotatably arranged in the accommodating cavity, and an outer gear sleeve (4) fixedly surrounded by the outer side of the idler frame (2) and forming a meshing transmission with the planetary gear (3), wherein a gear shaft (5) is rotatably penetrated through the center of the planetary gear (3), and two ends of the gear shaft (5) are respectively connected to connecting holes at two ends of the idler frame (2), characterized in that: One end of the gear shaft (5) extending out of the connection hole is provided with a limiting step (51), and one end of the idler frame (2) is provided with a limiting gasket (6) that cooperates with and abuts against the limiting step (51) and is used to limit the idle rotation of the gear shaft (5). When the planetary gear (3) and the external gear sleeve (4) are meshed and transmitted, the idler frame (2) is driven to rotate.

2. The speed reduction mechanism for a tightening machine according to claim 1, characterized in that: Two planetary gears (3) are arranged in parallel on the idler frame (2) and are respectively arranged to rotate around two gear shafts (5) in the accommodating cavity. The limiting gasket (6) is a circular structure. One end of the two gear shafts (5) abuts against the outer peripheral edge of the limiting gasket (6) through two limiting steps (51).

3. The speed reduction mechanism for a tightening machine according to claim 2, characterized in that: The outer gear sleeve (4) is fixed in the housing (1) and has a rotation gap with the idler frame (2). An annular rack belt (41) meshing with the two planetary gears (3) is circumferentially arranged on the inner wall of the outer gear sleeve (4).

4. The speed reduction mechanism for a tightening machine according to claim 3, characterized in that: The driving structure comprises a driving gear shaft (9) extending from the other end of the idler frame (2) into the accommodating cavity, and the driving gear shaft (9) is meshingly connected with two planetary gears (3).

5. The speed reduction mechanism for a tightening machine according to claim 4, characterized in that: The idler frame (2) is cylindrical in shape and is provided with a first connecting shaft (21) and a second connecting shaft (22) of hollow structure at both ends thereof; the limit washer (6) is sleeved on the first connecting shaft (21); a limit stopper is provided on the first connecting shaft (21) for preventing the limit washer (6) from axially disengaging from the connecting shaft; and the driving gear shaft (9) rotates and passes through the second connecting shaft (22).

6. The speed reduction mechanism for a tightening machine according to any one of claims 1 to 5, characterized in that: The output assembly comprises a worm wheel (8) and a worm (7) which are meshed and connected, and one end of the worm (7) is inserted into the first connecting shaft (21) to form a linkage fit for transmitting torque.

7. The speed reduction mechanism for a tightening machine according to claim 6, characterized in that: The worm wheel (8) comprises a detachably connected worm wheel body (81) and a worm wheel shaft (82); the worm wheel body (81) has a coaxially arranged coupling portion (83), and a worm wheel shaft hole (84) penetrating the worm wheel body (81) and the coupling portion (83) along the axial direction of the worm wheel body (81); one end of the worm wheel shaft (82) is connected to the worm wheel shaft hole and forms a linkage with the worm wheel body (81); the shapes of the worm wheel shaft hole (84) and the worm wheel shaft (82) are respectively matched polygonal structures.

8. The speed reduction mechanism for a tightening machine according to claim 7, characterized in that: At least one first bearing (11) is provided between the worm (7) and the housing (1), at least one second bearing (12) is provided between the worm gear shaft (82) and the housing (1), and the other end of the worm gear shaft (82) protrudes outside the housing (1).

9. The speed reduction mechanism for a tightening machine according to claim 5, characterized in that: A third bearing (13) is installed on the first connecting shaft (21), and the limiting stopper is the third bearing (13), so that the limiting gasket (6) is installed between the third bearing (13) and the idle frame (2).

10. The speed reduction mechanism for a tightening machine according to claim 9, characterized in that: A mounting sleeve (14) sleeved on the third bearing (13) is arranged in the housing (1), and the external gear sleeve (4) is fixedly connected to the mounting sleeve (14).

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