Automatic tensioning mechanism

Abstract

The utility model provides an automatic tensioning mechanism which comprises a tensioning wheel assembly, a shaft and a base, the tensioning wheel assembly is rotatably installed on the base through the shaft, a tensioning wheel is arranged in the tensioning wheel assembly, and the automatic tensioning mechanism further comprises a tensioning wheel assembly lifting power and control assembly. The control assembly is provided with inductive switches corresponding to the lifting position and the lowering position of the tensioning wheel, and the control assembly controls starting or stopping of lifting power and forward rotation or reverse rotation of the lifting power. The tensioning wheel lifting device can automatically lift the tensioning wheel through the motor, and is simple and reliable in structure, stable in state after the tensioning wheel is lifted, sensitive in action during descending, and power-saving in operation.

Description

Technical Field

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

[0002] A portable baler is a portable strapping device that is conveniently carried to relevant work sites to strap items. The portable baler includes a tensioning mechanism and a welding mechanism, wherein the tensioning mechanism includes a tensioning wheel assembly and a tensioning drive assembly, which are respectively located on both sides of a base, and are connected to a common pin shaft, with the pin shaft being used as a rotation fulcrum for lifting up to open and resetting downward. In the prior art, the tensioning wheel is often lifted by directly fixing the mechanical structure with a handle, and the tensioning wheel assembly and the tensioning drive assembly are lifted by manpower to insert or remove the strapping tape, which has a low degree of automation and is time-consuming and labor-intensive. Utility Model Content

[0003] The purpose of the utility model is to provide an automatic tensioning mechanism that can automatically lift the tensioning wheel through a motor. To this end, the utility model adopts the following technical solutions:

[0004] An automatic tensioning mechanism comprises a tensioning wheel assembly, a shaft, and a base. The tensioning wheel assembly is rotatably mounted on the base via the shaft. A tensioning wheel is arranged in the tensioning wheel assembly. The automatic tensioning mechanism also comprises a lifting power of the tensioning wheel assembly and a control assembly. The control assembly is provided with an induction switch corresponding to lifting and lowering the tensioning wheel into place. The control assembly controls the start or stop of the lifting power and forward or reverse rotation.

[0005] On the basis of adopting the above technical solutions, the utility model can also adopt the following technical solutions, or use these technical solutions in combination:

[0006] The control assembly is provided with a control switch, a first sensing switch, a second sensing switch, and a rotating sensing member for cooperating with the first sensing switch and the second sensing switch. The first sensing switch and the second sensing switch are arranged along the rotation path of the rotating sensing member. The first sensing switch is used to stop the lifting power of the tensioning wheel assembly when the tensioning wheel is lifted into place, and the second sensing switch is used to stop the lifting power of the tensioning wheel assembly when the tensioning wheel is lowered into place. The control switch is used to control the forward start and reverse start of the lifting power. The forward rotation corresponds to the rotation direction of the tensioning wheel rising, and the reverse rotation corresponds to the rotation direction of the tensioning wheel falling.

[0007] The rotation induction member is connected to the lifting power through a first transmission mechanism.

[0008] The automatic tensioning mechanism is provided with a lifting connecting piece, and the lifting connecting piece is connected to the tensioning wheel assembly through a connecting structure. The lifting connecting piece is unidirectionally connected to the lifting power. When the lifting power drives the tensioning wheel assembly to be lifted in a forward rotation, it is connected to the lifting power driving connection, and when the lifting power is reversed, it is disconnected from the lifting power driving connection. The forward rotation corresponds to the rotation direction of the tensioning wheel rising, and the reverse rotation corresponds to the rotation direction of the tensioning wheel falling.

[0009] The automatic tensioning mechanism is provided with a lifting connecting piece, and the lifting connecting piece is connected to the tensioning wheel assembly through a connecting structure. The lifting connecting piece is unidirectionally connected to the lifting power. When the lifting power drives the tensioning wheel assembly to be lifted in the forward direction, it is connected to the lifting power driving connection, and when the lifting power is reversed, it is disconnected from the lifting power driving connection; the first transmission mechanism adopts a gear meshing connection mechanism, whose first gear is connected to the lifting power and is connected to the first structure unidirectionally connected to the lifting connecting piece, and its second gear is connected to the rotating sensing element, and the first gear and the second gear are transmission connected.

[0010] The lifting connector is a hook with a curved arm.

[0011] The induction switch is arranged on a fixed base, and a second structure for limiting and supporting the lifting connection member when the tensioning wheel is lifted to the limit position is arranged on the fixed base. The lifting connection member is connected to an elastic component and is elastically supported, and can adaptively maintain the position when the lifting connection member contacts and disengages from the first structure supporting and limiting the lifting connection member.

[0012] The lifting connection member is rotatably connected and the elastic member is arranged between the lifting connection member and its connection base member.

[0013] The lifting power is fixed on the first side of the base, and the first transmission mechanism is located on the second side of the base; the tension wheel assembly is located on the first side of the base, the lifting connecting piece is located on the second side of the base, and is rotatably connected to the hood, an elastic component is arranged between the lifting connecting piece and the hood and is elastically supported, and the hood and the tension wheel assembly are rotatably mounted on the base through the shaft and rotate synchronously; the elastic component adopts a torsion spring.

[0014] The shaft has shaft sections on the first side and the second side of the base respectively, the tensioning wheel assembly and the hood are respectively connected to the first side shaft section and the second side shaft section of the shaft, the tensioning wheel and the tensioning drive motor are connected together through a second transmission mechanism, and can rotate synchronously with the shaft as a fulcrum, and the tensioning drive motor is located on the second side of the base and fixedly connected to the hood.

[0015] The tensioning mechanism is provided with a handle for operating the control switch, and the handle is rotatably connected to a fixed base and is connected to a reset spring.

[0016] The control switch is a micro switch, which is set to be in the first state when the handle is lifted, and the lifting power is forward, and when the handle is lowered from the lifted state, the lifting power is reversed.

[0017] The shaft is a fixed shaft, and bearings are arranged at the positions where the tension wheel assembly and the hood are rotatably connected to the fixed shaft, and are rotatably connected to the fixed shaft through the bearings.

[0018] The tensioning mechanism is also provided with a reset mechanism, which drives the tensioning wheel assembly and the components that rotate synchronously with the tensioning wheel assembly around the axis to reset downward.

[0019] Due to the adoption of the technical solution of the utility model, the utility model can automatically lift the tension wheel through the motor, and has a simple and reliable structure. The tension wheel is stable after being lifted, and has sensitive movements and energy-saving operation when descending. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of an embodiment of the utility model.

[0021] Figure 2 It is a schematic diagram of the control mechanism of the embodiment of the utility model in the initial state.

[0022] Figure 3 It is a schematic diagram of the control mechanism of the embodiment of the utility model when it is lifted into place on the tension wheel.

[0023] Figure 4 It is a schematic diagram of an embodiment of the utility model in an initial state.

[0024] Figure 5 It is a schematic diagram of an embodiment of the utility model when it is lifted into place on the tension wheel.

[0025] Figure 6 It is a schematic diagram of an embodiment of the utility model.

[0026] Figure 7 This is a schematic diagram of the connection between the lifting rod and the hood according to an embodiment of the utility model. Implementation

[0027] Refer to the attached drawings. The utility model provides a tensioning mechanism, which is a tensioning mechanism for a portable baler, comprising a tensioning wheel assembly, an axis 1, and a base 100. The tensioning wheel assembly is rotatably mounted on the base through the axis. The tensioning wheel assembly is provided with a tensioning wheel 2, and may also include a tensioning wheel cover 20. The automatic tensioning mechanism also includes a lifting power of the tensioning wheel assembly, i.e., a motor 3, and a control assembly. The control assembly is provided with an induction switch corresponding to the lifting and lowering of the tensioning wheel 2. The control assembly controls the start or stop of the lifting power and the forward or reverse rotation.

[0028] The control assembly is provided with a control switch 40, a first induction switch 41 and a second induction switch 42, and a rotating induction member 4 for cooperating with the first induction switch 41 and the second induction switch 42. The first induction switch 41 and the second induction switch 42 are arranged along the rotation path of the rotating induction member 4. The first induction switch 41 is used to stop the lifting power of the tension wheel assembly when the tension wheel 2 is lifted into place, and the second induction switch 42 is used to stop the lifting power of the tension wheel assembly when the tension wheel is lowered and reset into place. The control switch 40 is used to control the lifting power, that is, the forward start and reverse start of the motor 3. The forward rotation is the rotation direction corresponding to the lifting of the tension wheel 2, and the reverse rotation is the rotation direction corresponding to the lowering of the tension wheel 2. The first induction switch 41 and the second induction switch 42 can be micro switches. The rotating induction member 4 is set to a fan-shaped block, which has a top arc and corners located on both sides of the top arc to cooperate with the first induction switch 41 and the second induction switch 42 respectively.

[0029] The rotating sensing member 4 is connected to the lifting power through the first transmission mechanism, and the lifting power of the tensioning wheel drives the sensing matching member, that is, the rotating sensing member 4 to rotate.

[0030] The automatic tensioning mechanism is provided with a lifting connecting piece, and the lifting connecting piece is connected to the tensioning wheel assembly via a connecting structure. The connecting structure can be a structure directly connected to the tensioning wheel assembly, or the lifting connecting piece is connected to a component that rotates synchronously around the axis 1 with the tensioning wheel assembly, and the component that rotates synchronously around the axis 1 is also regarded as a part of the connecting structure. The utility model adopts the latter implementation mode, which will be described in detail below.

[0031] The lifting connection piece is unidirectionally connected to the lifting power. When the lifting power drives the tension wheel assembly to be lifted in forward rotation, it is drivingly connected to the lifting connection piece, and when the lifting power is reversed, it is drivingly disconnected from the lifting connection piece.

[0032] The first transmission mechanism adopts a gear meshing connection mechanism, wherein the first gear 61 is connected to the lifting power, i.e., the motor 3, and is connected to the first structure 50 which is unidirectionally connected to the lifting connection member, and the second gear 62 is connected to the rotating sensing member, and the first gear 61 and the second gear 62 are in transmission connection. By adjusting the forward and reverse rotation of the first gear 61 and the second gear 62, the driving of lifting the tension wheel and the driving of pressing down the upper welding assembly in the portable baler can be combined based on the same motor, and the structure is more compact, which meets the requirements of miniaturized portable balers.

[0033] The lifting connector 5 is a hook 51 with a curved arm. The first structure 50 may be a pin, a block, etc. fixed to the first gear 61 and protruding to the side.

[0034] The first induction switch 41 and the second induction switch 42 are arranged on a fixed base. In the present utility model, the fixed base may be the base 100 of the portable baler, or a component fixedly connected to the base 100. In this embodiment, the first induction switch 41 and the second induction switch 42 are arranged on a fixed plate 101. The fixed plate 101 serves as a fixed base. The fixed plate 101 may be an integral part of the base 100 or a separate component fixedly mounted on the base 100. The fixed plate 101 is arranged on a second structure 102 that limits and supports the lifting connection member when the tension wheel 2 is lifted to the limit position. When the lifting connection member and the tension wheel assembly are lifted and rotated with the shaft 1 as the fulcrum, they gradually enter the limit and support range of the second structure 102.

[0035] The lifting connection member is rotatably connected and installed on its connecting base member, and the connecting base member can be a tension wheel assembly or a member that rotates synchronously with the tension wheel assembly around the axis 1. The lifting connection member is connected to an elastic member 52 and is elastically supported, and can adaptively maintain its position when the lifting connection member contacts the first structure 50 that supports the lifting connection member. Even if it is out of the control of the hand, under the comprehensive coordination of the elastic support of the elastic member 52, the support of the first structure 50, and the support and limit of the second structure 102, it can balance with gravity and prevent the lifting connection member from moving downward, so that the tension wheel assembly can also be stabilized in a high position. When the motor is reversed and the lifting connection member is disconnected from the driving connection with the first structure 50 (that is, when the lifting power is reversed), after the entire part is separated from the second structure 102, it can also be supported by the elastic member 52, and the second structure 102 can be a curved wall.

[0036] The lifting power is fixed on the first side of the base 100, and the first transmission mechanism is located on the second side of the base 100; the tension wheel assembly is located on the first side of the base 100, and the lifting connection piece and the rotatable hood 7 are located on the second side of the base 100. The hood 7 serves as the connection base of the lifting connection piece. The lifting connection piece is rotatably connected with the hood 7, and the elastic component 52 is arranged between the lifting connection piece and the hood 7 to be elastically supported. The elastic component 52 adopts a torsion spring, and the torsion spring is sleeved on the rotation connection shaft between the lifting connection piece and the hood 7. The rotatable hood 7 and the tension wheel assembly are rotatably mounted on the base 100 through the shaft 1 and rotate synchronously.

[0037] The tensioning mechanism is provided with a handle 103 for operating the control switch 40. The handle 103 is rotatably connected to a fixed base and connected to a reset spring 104. The fixed base may be the base 100 of the portable baler, or a component fixedly connected to the base 100. In this embodiment, the fixed base is the fixed plate 101. The control switch 40 is a micro switch. When the handle is lifted, it is in one switch state, and when the handle is released (driven by the reset spring 104 to rotate downward and reset), it is in another switch state, so that the forward and reverse rotation of the lifting power can be continuously controlled by one switch.

[0038] The shaft 1 is a fixed shaft, fixedly connected to the base 100 in the portable baler and cannot rotate. There is no gap in the middle of the shaft that will cause dragging during the tensioning work, which improves the alignment of the tension wheel during the tensioning work, prevents the tension wheel from deflecting in the thickness direction, and improves the uniform pressure of the circumferential surface of the tension wheel 2 on the belt during the tensioning work, which helps to prevent the belt from running off. The fixed connection method can adopt the method of interference fit connection between the fixed shaft 1 and the shaft hole in the base 100. The tension wheel 2 and the tension wheel drive motor 21 are connected together through the second transmission mechanism 22, and can rotate synchronously with the fixed shaft 1 as the fulcrum, lift the tension wheel 2 upward and reset the tension wheel 2 downward. The drive motor 21 is fixedly installed outside the hood 7, and the hood 7 is provided with a hole for the second transmission mechanism to connect with the drive motor 21, such as the power supply shaft to pass through. In this embodiment, the second transmission mechanism 22 adopts a worm gear mechanism, and the drive motor 21 is connected to the tension wheel 2 through the worm gear mechanism, and drives the tension wheel 2 to rotate.

[0039] The tension wheel cover 20 is provided with bearings at the position where it is rotatably connected to the fixed shaft, and is rotatably connected to the fixed shaft through the bearings. The bearings are also in the form of shaft sleeves.

[0040] The tensioning mechanism is also provided with an outer stopper 23 of the strapping belt. In this embodiment, the outer stopper 23 is located at the first side of the base 100 and is connected to the base 100 through a connecting shaft, and is synchronously lifted and lowered to the outer side of the strapping belt in the tensioning mechanism (i.e., the outer side of the junction of the tensioning wheel 2 and the lower tensioning tooth plate) with the tensioning wheel 2. The travel stopper structure of the outer stopper (such as an axle pin fixedly connected to the tensioning wheel cover 20) is provided on the tensioning wheel cover 20. The outer stopper 23 can be provided in an arc-shaped plate shape, and an arc-shaped stopper hole is provided inside the outer stopper to cooperate with the travel stopper structure.

[0041] The tensioning mechanism is also provided with a reset mechanism 24, and the components located on the first side of the base 100 and the components located on the second side of the base are driven to reset downward by the elastic components in the reset mechanism 24. Preferably, the reset mechanism is provided on the base 100 deviating from the fixed axis 1, and acts on the reset matching component 25 located between the tension wheel 2 and the driving motor 21, thereby not only increasing the force arm of the reset force and improving the reset performance, but also the reset mechanism can also play an auxiliary role in the alignment of the tension wheel, preventing the tension wheel 2 from deflecting in the thickness direction and preventing the belt from running off.

[0042] The reset matching component 25 is sleeved outside the shaft of the second transmission mechanism and is fixedly connected to the hood 7, and rotates synchronously with the tension wheel 2 and the drive motor 21 with the fixed shaft 1 as the fulcrum when the tension wheel 2 is opened upward and reset downward.

[0043] The following is the operation process of this embodiment:

[0044] 1. Lift the handle 103, the small handle 3 is disengaged from the control switch 40, the lifting power is started to drive the first gear 61 to rotate counterclockwise (forward), the first gear 61 drives the lifting connection piece to lift up, the lifting connection piece 5 drives the machine cover 7, the drive motor 21 and the tensioning wheel assembly to lift up so that the tensioning wheel and the tensioning lower tooth plate 26 are opened, and the tensioning wheel cover 20 drives the outer limit piece 23 to lift up until the rotation sensing piece 4 on the second gear 62 meshing with the first gear 61 contacts the first sensing switch and stops rotating. At this time, the lifting connection piece and the first structure 50 and the limiting and supporting structure on the fixed plate 101, that is, the second structure 102, form a stable triangle to ensure that the tensioning wheel is always kept in the lifted state. At this time, the belt is started to be released. (During the belt release process, the handle 103 should be kept lifted, but the power is cut off after the lifting power is in place, saving electricity. The lifting power will reverse as soon as the handle 103 is released)

[0045] 2. After the belt is put in place, release the handle 103, the handle 103 contacts the control switch 40, the lifting power is reversed, the first gear 61 rotates clockwise, the lifting connection loses support, the hood 7, the drive motor 21 and the tensioning wheel assembly move downward under the action of gravity and the reset mechanism 24 until the tensioning wheel 2 presses the belt, the second gear 62 rotates with the first gear 61 until the rotating sensing member 4 hits the second sensing switch 42, and the lifting power stops.

[0046] Subsequently, the portable baler will perform the welding work.

[0047] Unless otherwise specified, in the present invention, the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial" and the like indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0048] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "clamped" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the protection scope of the present invention.

Claims

1. An automatic tensioning mechanism, comprising a tensioning wheel assembly, a shaft, and a base, wherein the tensioning wheel assembly is rotatably mounted on the base through the shaft, and a tensioning wheel is arranged in the tensioning wheel assembly, characterized in that The automatic tensioning mechanism also includes a tensioning wheel assembly lifting power and a control assembly. The control assembly is provided with a sensing switch corresponding to the tensioning wheel being lifted into place and lowered into place. The control assembly controls the start or stop of the lifting power and the forward or reverse rotation.

2. An automatic tensioning mechanism as claimed in claim 1, characterized in that The control assembly is provided with a control switch, a first sensing switch, a second sensing switch, and a rotating sensing member for cooperating with the first sensing switch and the second sensing switch. The first sensing switch and the second sensing switch are arranged along the rotation path of the rotating sensing member. The first sensing switch is used to stop the lifting power of the tensioning wheel assembly when the tensioning wheel is lifted into place, and the second sensing switch is used to stop the lifting power of the tensioning wheel assembly when the tensioning wheel is lowered into place. The control switch is used to control the forward start and reverse start of the lifting power. The forward rotation corresponds to the rotation direction of the tensioning wheel rising, and the reverse rotation corresponds to the rotation direction of the tensioning wheel falling.

3. An automatic tensioning mechanism as claimed in claim 2, characterized in that The rotation induction member is connected to the lifting power through a first transmission mechanism.

4. An automatic tensioning mechanism as claimed in claim 1, characterized in that The automatic tensioning mechanism is provided with a lifting connecting piece, and the lifting connecting piece is connected to the tensioning wheel assembly through a connecting structure. The lifting connecting piece is unidirectionally connected to the lifting power. When the lifting power drives the tensioning wheel assembly to be lifted in a forward rotation, it is connected to the lifting power driving connection, and when the lifting power is reversed, it is disconnected from the lifting power driving connection. The forward rotation corresponds to the rotation direction of the tensioning wheel rising, and the reverse rotation corresponds to the rotation direction of the tensioning wheel falling.

5. An automatic tensioning mechanism as claimed in claim 3, characterized in that The automatic tensioning mechanism is provided with a lifting connection piece, the lifting connection piece is connected to the tension wheel assembly through a connection structure, the lifting connection piece is unidirectionally connected to the lifting power, when the lifting power drives the tension wheel assembly to be lifted in a forward direction, the lifting power is driven and connected to the lifting power, and when the lifting power is reversed, the lifting power is disconnected from the driving connection; The first transmission mechanism adopts a gear meshing connection mechanism, wherein the first gear is connected to the lifting power and is connected to the first structure which is unidirectionally connected to the lifting connection member, and the second gear is connected to the rotating sensing member, and the first gear and the second gear are in transmission connection.

6. An automatic tensioning mechanism as claimed in claim 4 or 5, characterized in that The lifting connector is a hook with a curved arm.

7. An automatic tensioning mechanism as claimed in claim 4 or 5, characterized in that The induction switch is arranged on a fixed base, and a second structure for limiting and supporting the lifting connection member when the tensioning wheel is lifted to the limit position is arranged on the fixed base. The lifting connection member is connected to an elastic component and is elastically supported, and can adaptively maintain the position when the lifting connection member contacts and disengages from the first structure supporting and limiting the lifting connection member.

8. An automatic tensioning mechanism as claimed in claim 7, characterized in that The lifting connection member is rotatably connected and the elastic member is arranged between the lifting connection member and its connection base member.

9. An automatic tensioning mechanism as claimed in claim 5, characterized in that The lifting power is fixed on the first side of the base, and the first transmission mechanism is located on the second side of the base; The tension wheel assembly is located on the first side of the base, the lifting connection piece is located on the second side of the base and is rotatably connected to the hood, an elastic component is arranged between the lifting connection piece and the hood and is elastically supported, the hood and the tension wheel assembly are rotatably mounted on the base through the shaft and rotate synchronously; the elastic component adopts a torsion spring.

10. An automatic tensioning mechanism as claimed in claim 9, characterized in that The shaft has shaft sections on the first side and the second side of the base respectively, the tensioning wheel assembly and the hood are respectively connected to the first side shaft section and the second side shaft section of the shaft, the tensioning wheel and the tensioning drive motor are connected together through a second transmission mechanism, and can rotate synchronously with the shaft as a fulcrum, and the tensioning drive motor is located on the second side of the base and fixedly connected to the hood.

11. An automatic tensioning mechanism as claimed in claim 2, characterized in that The tensioning mechanism is provided with a handle for operating the control switch, and the handle is rotatably connected to a fixed base and is connected to a reset spring.

12. An automatic tensioning mechanism as claimed in claim 2, characterized in that The control switch is a micro switch, which is set to be in the first state when the handle is lifted, and the lifting power is forward, and when the handle is lowered from the lifted state, the lifting power is reversed.

13. An automatic tensioning mechanism as claimed in claim 10, characterized in that The shaft is a fixed shaft, and bearings are arranged at the positions where the tension wheel assembly and the hood are rotatably connected to the fixed shaft, and are rotatably connected to the fixed shaft through the bearings.

14. An automatic tensioning mechanism as claimed in claim 1, characterized in that The tensioning mechanism is also provided with a reset mechanism, which drives the tensioning wheel assembly and the components that rotate synchronously with the tensioning wheel assembly around the axis to reset downward.

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