Power delay mechanism and reinforcing steel bar binding machine

Abstract

The invention provides a power delay mechanism and a reinforcing steel bar strapping machine. The power delay mechanism comprises n sets of transmission rings which are sequentially nested from inside to outside, n is larger than or equal to 2, a delay transmission structure is arranged between every two adjacent transmission rings, and the first transmission ring on the innermost ring drives the second transmission ring on the outermost ring to rotate in a delayed mode through the delay transmission structures; the reinforcing steel bar binding machine comprises a machine shell, a power device, a wire twisting mechanism, a wire feeding mechanism and the power delay mechanism, wherein the power device is connected with the wire feeding mechanism through the power delay mechanism. Through the design of the transmission ring nested in the radial direction, an existing transmission structure arranged in the axial direction is replaced, the technical problem that an existing time delay mechanism is large in occupied size, and consequently a machine body is lengthy is solved, it is guaranteed that the time delay function is stably achieved, meanwhile, the equipment size is remarkably reduced, operation convenience is improved, transmission is flexible and smooth, and the service life is prolonged. And coordination and high efficiency of steel bar bundling operation are ensured.

Description

Technical Field

[0001] This invention relates to power tools and construction equipment technology, specifically to a power delay mechanism and a rebar tying machine using the same mechanism. Background Technology

[0002] In industries such as civil engineering, construction, bridge and road building, rebar tying machines serve as highly efficient construction tools. Through an internal automated wire winding and twisting mechanism, they secure laid rebar, significantly reducing manual labor intensity and improving construction efficiency. The power delay mechanism is one of the core components of the rebar tying machine. Its core function is to prevent the wire feeding mechanism from misfeeding due to the motor's consistent rotation during the wire twisting mechanism's reset process, ensuring the orderly execution of the tying operation.

[0003] However, existing rebar tying machines generally employ an axially arranged transmission structure for their power delay mechanism, with each set of transmission components arranged sequentially along the machine's axis to transmit power. This structural design results in a large axial space occupied by the delay mechanism, leading to an overall longer and bulkier rebar tying machine. In actual construction scenarios, an excessively long machine not only reduces portability but also hinders flexibility in confined spaces, impacting construction efficiency. Furthermore, the axially arranged transmission structure may also result in a long power transmission path and high transmission resistance, affecting the smoothness of the mechanism's operation.

[0004] Therefore, there is an urgent need for a compact and small-sized power delay mechanism to solve the technical problems of existing rebar tying machines, such as long machine body, poor portability, and insufficient operational flexibility caused by the design of the delay mechanism. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a power delay mechanism and a rebar tying machine.

[0006] To achieve the above and other related objectives, the technical solution provided by the present invention is: a power delay mechanism, comprising n sets of transmission rings nested sequentially from the inside to the outside, where n≥2, and a time-delay transmission structure between adjacent sets of transmission rings, defining the transmission ring located in the innermost ring as transmission ring one, and defining the transmission ring located in the outermost ring as transmission ring two, wherein transmission ring one drives transmission ring two to rotate with a time delay through the time-delay transmission structure.

[0007] The preferred technical solution is that the transmission ring has a shaft hole structure.

[0008] The preferred technical solution is that the transmission ring two has a conical tooth surface structure.

[0009] The preferred technical solution is as follows: the inner ring of two adjacent sets of transmission rings is defined as transmission ring three, and the outer ring of two adjacent sets of transmission rings is defined as transmission ring four. The time-delay transmission structure includes an active block formed on the outer ring of transmission ring three, a stepped hole provided on transmission ring four, and a driven block formed on the inner ring of the large diameter section of the stepped hole. The small diameter section of the stepped hole is located on the outer ring of transmission ring three, and the active block is located on the large diameter section of the stepped hole and interferes with the driven block.

[0010] The preferred technical solution is that the active block is disposed near the outer ring of the third transmission ring, and the other side of the outer ring of the third transmission ring is matched with the small diameter section of the stepped hole.

[0011] A rebar tying machine includes a housing, a power unit, a wire twisting mechanism, and a wire feeding mechanism. The power unit, the wire twisting mechanism, and the wire feeding mechanism are all located in the housing. The power unit and the wire twisting mechanism are connected. The machine also includes the aforementioned power delay mechanism. The power unit is connected to the wire feeding mechanism through the power delay mechanism.

[0012] The preferred technical solution is as follows: the power device includes a motor and a drive gear, the motor is fixed in the housing, and the drive gear is located on the output shaft of the motor.

[0013] The preferred technical solution is as follows: the twisting mechanism includes a rotating shaft, a driven gear, a spring, a first bushing, a second bushing, a first twisting plate, a second twisting plate, a first drive post, and a second drive post. The rotating shaft is rotatably mounted in the housing. The driven gear is sleeved on the rotating shaft and meshes with the driving gear. The first bushing is rotatably mounted at the end of the rotating shaft. The rotating shaft has an annular boss. The spring is sleeved on the rotating shaft, with one end of the spring abutting against the annular boss and the other end of the spring abutting against the first bushing. The second bushing is sleeved on the outer periphery of the rotating shaft and the first bushing. A spiral groove is formed on the outer periphery of the rotating shaft. The inner circumference of the second bushing is formed with a guide block, which slides in the spiral groove. The two opposite sides of the end of the second bushing are provided with notches one and two, and the two opposite sides of the end of the first bushing are provided with notches three and four. The twisting plate is hinged in notch one, the twisting plate two is hinged in notch two, the drive post one is fixed in notch three, the drive post two is fixed in notch four, the Y-shaped claw one on the twisting plate one extends into notch three and engages with the drive post one, and the Y-shaped claw two on the twisting plate two extends into notch four and engages with the drive post two.

[0014] The preferred technical solution is as follows: the wire feeding mechanism includes a mounting base, a drive shaft, a fixed shaft, a first wire feeding gear, a second wire feeding gear, a bevel gear, a wire wheel, and a guide groove. The mounting base is fixedly installed inside the machine housing. Both the drive shaft and the fixed shaft are vertically mounted on the mounting base. The first wire feeding gear is mounted on the fixed shaft, and the second wire feeding gear is mounted on the drive shaft and meshes with the first wire feeding gear. The first wire feeding gear has an annular groove on its outer circumference, and the second wire feeding gear has an annular groove on its outer circumference. The annular grooves one and two are arranged opposite to each other to form a conveying mechanism. The steel wire channel includes a bevel gear mounted on the drive shaft, a steel wire wheel rotatably mounted in the housing, a guide groove fixed in the housing and used to guide the steel wire rope to the twisting mechanism, an L-shaped connecting rod in the guide groove, the middle section of the L-shaped connecting rod hinged in the guide groove, one end of the L-shaped connecting rod extending into the guide groove and equipped with a cutter, and the other end of the L-shaped connecting rod equipped with a drive block. The drive block is connected to the guide groove by a buffer spring, and the drive block is also correspondingly configured with a guide protrusion on the outer periphery of the bushing.

[0015] The preferred technical solution is that the shaft hole structure in the power delay mechanism is fixed on the rotating shaft, and the bevel tooth surface structure in the power delay mechanism is meshed with the bevel gear.

[0016] Due to the application of the above technical solution, the beneficial effects of this invention are as follows:

[0017] To solve the problem of the large size of existing technologies: The power delay mechanism of this invention adopts a radial nested transmission ring design from the inside to the outside, replacing the traditional axially arranged transmission structure, which greatly reduces the space occupied by the mechanism in the axial direction, shortens the body length of the rebar tying machine by more than 30%, makes it smaller and more portable, and is especially suitable for construction in narrow spaces.

[0018] Smooth and efficient transmission: The radially nested transmission rings achieve stable rotation through the cooperation of the small-diameter section of the stepped hole with the inner transmission ring. The interference transmission structure between the driving block and the driven block is simple, the power transmission path is short, and the transmission resistance is small, ensuring that the mechanism operates flexibly and smoothly and reducing energy loss.

[0019] Precise and controllable delay function: By adjusting the initial relative position of the active block and the driven block, the delay time can be precisely set to ensure that the delay time matches the reset time of the twisting mechanism, effectively avoiding the malfunction of the wire feeding mechanism when the twisting mechanism is reset, and ensuring the orderliness and reliability of the binding operation.

[0020] The overall structure is streamlined: the connection structure between the power delay mechanism, the wire twisting mechanism, and the wire feeding mechanism is compact, eliminating the need for additional complex transmission and transfer components. This simplifies the internal structure of the rebar tying machine, reduces assembly difficulty and production costs, and improves the stability and service life of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the power delay mechanism involved in the present invention from one perspective.

[0022] Figure 2 This is a schematic diagram of the power delay mechanism involved in the present invention from another perspective.

[0023] Figure 3 This is an exploded view of the power delay mechanism involved in this invention.

[0024] Figure 4 This is a schematic diagram of the overall structure of the rebar tying machine involved in the present invention.

[0025] Figure 5 This is a schematic diagram of the internal structure of the rebar tying machine involved in the present invention.

[0026] Figure 6 This is a schematic diagram of the wire twisting mechanism involved in the present invention.

[0027] Figure 7 This is a schematic cross-sectional view of the wire twisting mechanism involved in the present invention. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0029] Please see Figures 1-7 It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1: Power Delay Mechanism

[0032] like Figure 1 , Figure 2 As shown, a power delay mechanism includes four sets of transmission rings nested from the inside out (n=4, namely transmission ring 1, transmission ring 3, transmission ring 4, and transmission ring 2), and a time-delay transmission structure is provided between adjacent sets of transmission rings.

[0033] like Figure 3 As shown, the center of transmission ring 1 is provided with a shaft hole structure 6, which is a keyway hole, used to be fixedly connected to the rotating shaft 101 of the rebar binding machine by a flat key; the outer periphery of transmission ring 2 is provided with a bevel tooth surface structure 7, used to mesh with the bevel gear 116 of the wire feeding mechanism 11.

[0034] like Figure 3 As shown, the time-delay transmission structure between adjacent transmission rings 3 and 4 includes: a driving block 31 formed on the outer ring of transmission ring 3, a stepped hole 41 on transmission ring 4, and a driven block 42 formed on the inner ring of the large-diameter section of the stepped hole 41; the small-diameter section of the stepped hole 41 is clearance-fitted with the outer ring of transmission ring 3, allowing transmission ring 4 to rotate relative to transmission ring 3; the driving block 31 is located within the large-diameter section of the stepped hole 41, and the initial relative positions of the driving block 31 and the driven block 42 form an angular difference (i.e., the driving block needs to rotate a certain angle to contact the driven block), and the time delay corresponding to this angular difference is 0.5s. It should be noted that transmission ring 1 and transmission ring 3, and transmission ring 4 and transmission ring 2 are also connected by the above time-delay transmission structure.

[0035] Example 2: Rebar Binding Machine

[0036] like Figure 4 and Figure 5 As shown, a rebar tying machine includes a housing 8, a power unit 9, a wire twisting mechanism 10, a wire feeding mechanism 11, and a power delay mechanism 12 as described in Embodiment 1.

[0037] like Figure 5As shown, the power unit 9 includes a motor 91 and a drive gear 92. The motor 91 is fixed to the mounting plate inside the housing 8 by bolts, and the drive gear 92 is fixed to the output shaft of the motor 91 by a flat key.

[0038] like Figure 6 and Figure 7 As shown, the wire twisting mechanism 10 includes a rotating shaft 101, a driven gear 102, a spring 103, a first bushing 104, a second bushing 105, a first twisting plate 106, a second twisting plate 107, a first drive post 108, and a second drive post 109. The rotating shaft 101 is rotatably mounted in a bearing seat of the housing 8 via a bearing. The driven gear 102 is sleeved on the rotating shaft 101 via a flat key and meshes with the driving gear 92. An annular boss 110 is provided at the end of the rotating shaft 101. The first bushing 104 is rotatably mounted on the end of the rotating shaft 101 via a bearing. The spring 103 is sleeved on the rotating shaft 101, with one end abutting against the annular boss 110 and the other end abutting against the end face of the first bushing 104. The second bushing 105 is sleeved on the outer periphery of the rotating shaft 101 and the first bushing 104. The bushing 105 has a spiral groove 111 and a guide block 112 on its inner circumference, which slides in the spiral groove 111. The bushing 105 has two opposite sides at its ends with notches 1 and 2, and the bushing 104 has two opposite sides at its ends with notches 3 and 4. The twisting plate 106 is hinged in notch 1 by a pin, and the twisting plate 107 is hinged in notch 2 by a pin. The drive column 108 is located in notch 3, and the drive column 109 is located in notch 4. The Y-shaped claw 1 on the twisting plate 106 extends into notch 3 and engages with the drive column 108, and the Y-shaped claw 2 on the twisting plate 107 extends into notch 4 and engages with the drive column 109. The bushing 105 has a guide protrusion 113 integrally formed on its outer circumference. When the rotating shaft 101 rotates, it first drives the guide block 112 to slide axially through the spiral groove 111, that is, it drives the first bushing 104 to move forward until the guide block 112 slides to the bottom of the spiral groove 111. This process will drive the first twisting plate 106 and the second twisting plate 107 to close. After that, the rotating shaft 101 continues to rotate, driving the first twisting plate 106 and the second twisting plate 107 to rotate, which is used to twist the steel wire to achieve binding. The spring 103 is used to buffer during this process to avoid jamming.

[0039] like Figure 5As shown, the wire feeding mechanism 11 includes a mounting base 111, a drive shaft 112, a fixed shaft 113, a first wire feeding gear 114, a second wire feeding gear 115, a bevel gear 116, a wire sheave 117, and a guide groove 118. The mounting base 111 is fixed to the housing 8 by bolts. The drive shaft 112 and the fixed shaft 113 are both vertically mounted on the mounting base 111 via bearings. The first wire feeding gear 114 is mounted on the fixed shaft 113 via a flat key, and the second wire feeding gear 115 is mounted on the drive shaft 112 via a flat key and meshes with the first wire feeding gear 114. The outer circumference of the first wire feeding gear 114 is provided with an annular groove 1, and the outer circumference of the second wire feeding gear 115 is provided with an annular groove 2. The annular groove 1 and the annular groove 2 are arranged opposite to each other to form a conveying mechanism for the wire feeding gear. The wire channel; the bevel gear 116 is mounted on the bottom end of the drive shaft 112 via a flat key; the wire wheel 117 is mounted on one side of the housing 8 via a bracket; the guide groove 118 is fixed in the housing 8 by bolts, its input end corresponds to the wire conveying channel, and its output end corresponds to the wire twisting mechanism 10; the guide groove 118 is provided with an L-shaped connecting rod 119, the middle section of the L-shaped connecting rod 119 is hinged to the side wall of the guide groove 118 by a pin, one end of which extends into the guide groove 118 and is provided with a cutter 120, and the other end is provided with a drive block 121; a buffer spring 122 is connected between the drive block 121 and the side wall of the guide groove 118, and the drive block 121 is correspondingly set with the guide protrusion on the outer periphery of the bushing 105.

[0040] After the wire twisting is completed, the bushing 104 resets. During the reset process, the guide protrusion on its outer periphery contacts the drive block 121, which in turn drives the cutter 120 in the guide groove 118 to cut the wire in the guide groove 118.

[0041] It should be noted that the shaft hole structure 6 of the power delay mechanism 12 is fixed to the rotating shaft 101 by a flat key, and the bevel tooth surface structure 7 of the power delay mechanism 12 is meshed with the bevel gear 116 of the wire feeding mechanism 11.

[0042] The steps for binding rebar are as follows: Motor 91 rotates forward, and wire feeding mechanism 11 feeds the wire until it reaches the specified length, then stops; Motor 91 rotates in reverse, and wire twisting mechanism 10 slides forward to the end and then twists the wire, stopping after completion; Motor 91 rotates forward, and wire twisting mechanism 10 returns to its initial position. The machine stops, completing the rebar binding operation.

[0043] Function of the power delay mechanism: When the wire twisting mechanism 10 resets, the rotation direction of the motor 91 is consistent with the wire feeding direction of the wire feeding mechanism 11. However, the reset of the wire feeding mechanism 11 is the final stage of the binding operation, and no wire feeding is required. Therefore, this power delay mechanism 12 is designed to delay the transmission of power to the wire feeding mechanism 11 during the reset process of the wire twisting mechanism 10, so that the wire feeding mechanism 11 does not feed wire, and the delay time is longer than the time it takes for the wire twisting mechanism 10 to reset to its initial position.

[0044] In this embodiment, the delay time of the power delay mechanism 12 is set to 0.5s, and the time for the bushing 105 of the wire twisting mechanism 10 to reset to the initial position is 0.3s, ensuring that the wire feeding mechanism 11 does not operate during the reset process.

[0045] Therefore, the present invention has the following advantages:

[0046] To solve the problem of the large size of existing technologies: The power delay mechanism of this invention adopts a radial nested transmission ring design from the inside to the outside, replacing the traditional axially arranged transmission structure, which greatly reduces the space occupied by the mechanism in the axial direction, shortens the body length of the rebar tying machine by more than 30%, makes it smaller and more portable, and is especially suitable for construction in narrow spaces.

[0047] Smooth and efficient transmission: The radially nested transmission rings achieve stable rotation through the cooperation of the small-diameter section of the stepped hole with the inner transmission ring. The interference transmission structure between the driving block and the driven block is simple, the power transmission path is short, and the transmission resistance is small, ensuring that the mechanism operates flexibly and smoothly and reducing energy loss.

[0048] Precise and controllable delay function: By adjusting the initial relative position of the active block and the driven block, the delay time can be precisely set to ensure that the delay time matches the reset time of the twisting mechanism, effectively avoiding the malfunction of the wire feeding mechanism when the twisting mechanism is reset, and ensuring the orderliness and reliability of the binding operation.

[0049] The overall structure is streamlined: the connection structure between the power delay mechanism, the wire twisting mechanism, and the wire feeding mechanism is compact, eliminating the need for additional complex transmission and transfer components. This simplifies the internal structure of the rebar tying machine, reduces assembly difficulty and production costs, and improves the stability and service life of the equipment.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A dynamic delay mechanism, characterized in that: It includes n sets of transmission rings nested from the inside out, where n≥2. A time-delay transmission structure is provided between two adjacent sets of transmission rings. The transmission ring located in the innermost ring is defined as transmission ring one, and the transmission ring located in the outermost ring is defined as transmission ring two. Transmission ring one drives transmission ring two to rotate for a time delay through the time-delay transmission structure.

2. The power delay mechanism according to claim 1, characterized in that: The transmission ring has a shaft hole structure.

3. The power delay mechanism according to claim 1, characterized in that: The second transmission ring has a conical tooth surface structure.

4. The power delay mechanism according to claim 1, characterized in that: The inner drive ring of two adjacent sets of drive rings is defined as drive ring three, and the outer drive ring of two adjacent sets of drive rings is defined as drive ring four. The time-delayed drive structure includes an active block formed on the outer ring of drive ring three, a stepped hole provided on drive ring four, and a driven block formed on the inner ring of the large diameter section of the stepped hole. The small diameter section of the stepped hole is located on the outer ring of drive ring three, and the active block is located on the large diameter section of the stepped hole and interferes with the driven block.

5. A power delay mechanism according to claim 4, characterized in that: The active block is positioned near the outer ring of the third transmission ring, and the other side of the outer ring of the third transmission ring is matched with the small diameter section of the stepped hole.

6. A rebar tying machine, comprising a housing, a power unit, a wire twisting mechanism, and a wire feeding mechanism, wherein the power unit, the wire twisting mechanism, and the wire feeding mechanism are all disposed within the housing, and the power unit and the wire twisting mechanism are connected, characterized in that: It also includes a power delay mechanism as described in any one of claims 1-4, wherein the power unit is connected to the wire feeding mechanism via the power delay mechanism.

7. A rebar tying machine according to claim 5, characterized in that: The power unit includes a motor and a drive gear. The motor is fixed in the housing, and the drive gear is located on the output shaft of the motor.

8. A rebar tying machine according to claim 7, characterized in that: The twisting mechanism includes a rotating shaft, a driven gear, a spring, a first bushing, a second bushing, a first twisting plate, a second twisting plate, a first drive post, and a second drive post. The rotating shaft is rotatably mounted in the housing. The driven gear is sleeved on the rotating shaft and meshes with the driving gear. The first bushing is rotatably mounted at the end of the rotating shaft. The rotating shaft has an annular boss. The spring is sleeved on the rotating shaft, with one end abutting against the annular boss and the other end abutting against the first bushing. The second bushing is sleeved on the outer periphery of the rotating shaft and the first bushing. A helical groove is formed on the outer periphery of the rotating shaft. A guide block is formed on the inner circumference of sleeve two, and the guide block slides in the spiral groove. Notch one and notch two are opened on two opposite sides of the end of sleeve two, and notch three and notch four are opened on two opposite sides of the end of sleeve one. The twisting plate is hinged in notch one, the twisting plate two is hinged in notch two, the drive post one is fixed in notch three, the drive post two is fixed in notch four, the Y-shaped claw one on the twisting plate one extends into notch three and engages with the drive post one, and the Y-shaped claw two on the twisting plate two extends into notch four and engages with the drive post two.

9. A rebar tying machine according to claim 8, characterized in that: The wire feeding mechanism includes a mounting base, a drive shaft, a fixed shaft, a first wire feeding gear, a second wire feeding gear, a bevel gear, a wire wheel, and a guide groove. The mounting base is fixed inside the machine housing. Both the drive shaft and the fixed shaft are vertically mounted on the mounting base. The first wire feeding gear is mounted on the fixed shaft, and the second wire feeding gear is mounted on the drive shaft and meshes with the first wire feeding gear. The first wire feeding gear has an annular groove on its outer circumference, and the second wire feeding gear has an annular groove on its outer circumference. The annular grooves one and two are arranged opposite to each other to form a passage for conveying the wire. The bevel gear is mounted on the drive shaft, the wire rope wheel is rotatably mounted in the housing, the guide groove is fixed in the housing and used to guide the wire rope to the twisting mechanism, the guide groove is provided with an L-shaped connecting rod, the middle section of the L-shaped connecting rod is hinged in the guide groove, one end of the L-shaped connecting rod extends into the guide groove and is provided with a cutter, the other end of the L-shaped connecting rod is provided with a drive block, the drive block is connected to the guide groove by a buffer spring, and the drive block is also correspondingly provided with a guide protrusion on the outer periphery of the bushing.

10. A rebar tying machine according to claim 9, characterized in that: The shaft hole structure in the power delay mechanism is fixed on the rotating shaft, and the bevel tooth surface structure in the power delay mechanism is meshed with the bevel gear.

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