Rope wheel mechanism

Abstract

The invention belongs to the technical field of mechanical transmission, particularly relates to a rope wheel mechanism, and provides the following scheme aiming at the problems that an existing spring reset type incomplete gear mechanism is prone to jamming, unbalanced in gear tooth load during working, large in occupied space and the like. The driven part is installed on the machine frame and moves relative to the machine frame, an energy storage part is further arranged between the driven part and the machine frame, the two ends of the energy storage part are connected with the driven part and the machine frame respectively, a flexible rope is used for replacing gear teeth to pull the driven part, and when the driven part cannot be reset to the correct position, tooth crest collision cannot happen, so that the situation that a mechanism is stuck or even equipment is damaged is avoided. Load is transmitted to the driving wheel through the rope all the time, the situation that the bearing capacity of a traditional spring reset type incomplete gear movement mechanism is weak at the beginning and the end of transmission is avoided, the rope is wound on the driving wheel in the working process, the driven part is driven by the rope, and the occupied space is smaller.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a rope pulley mechanism. Background Art

[0002] In the field of mechanical transmission, reciprocating motion mechanism is a key component to achieve periodic linear or curvilinear motion of objects. The traditional spring return type incomplete gear reciprocating motion mechanism is a common reciprocating motion mechanism, which is used to achieve periodic linear or curvilinear motion of objects. However, this mechanism still has the following problems in practical applications, which limits its promotion and use:

[0003] 1. When the driven rack or gear of the spring-reset incomplete gear mechanism fails to reset to the correct meshing position, the incomplete gear may enter into meshing and cause a tooth top collision; this will not only cause the mechanism to get stuck, but may also damage the equipment;

[0004] 2. When the spring-return incomplete gear mechanism just enters the meshing state, only the first pair of gear teeth enters the meshing state. At this time, this pair of gear teeth needs to bear the entire load, and because the contact area between the gear teeth is small, this easily leads to damage to the tooth surface and breakage of the gear teeth; similarly, similar problems will occur when disengaging;

[0005] 3. The transmission size of the spring return incomplete gear mechanism is large. The rack needs to move its own length during operation, so sufficient rack movement space needs to be reserved, which limits its application in some compact spaces.

[0006] In view of the above problems, the present invention document proposes a rope pulley mechanism. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art spring-reset incomplete gear mechanism, such as easy jamming, unbalanced gear tooth load during operation, and large occupied space, and to propose a rope pulley mechanism.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A rope pulley mechanism, comprising:

[0010] The driving wheel is rotatably mounted on the frame in a single-side supporting manner;

[0011] The follower is installed on the frame and moves relative to the frame. An energy storage member is also provided between the follower and the frame, and the two ends of the energy storage member are respectively connected to the follower and the frame.

[0012] One end of the rope is connected to the driving wheel through the circumference of the driving wheel, and the other end is directly or indirectly connected to the driven member, and at least one end of the rope is connected in a rotational manner to release the torsional stress on the rope;

[0013] The driving wheel is also provided with a de-wire guide portion, which has a guide surface or a guide rib whose distance from the driving wheel axis gradually decreases from the supported side to the suspended side of the driving wheel, so as to guide the rope to leave the peripheral surface of the driving wheel.

[0014] In a possible design, the derailment guide also includes a gap created by cutting material on the driving wheel, so as to reduce interference of the material on the wheel with the rope when the rope detaches from the wheel circumference.

[0015] In a possible design, a wheel groove is further provided on the circumferential surface of the driving wheel.

[0016] In a possible design, the wheel groove ends before approaching the derailment guide portion, so that the rope can be easily derailed from the wheel circumference.

[0017] In a possible design, a rotation connection for relieving torsional stress on the rope is arranged at an end of the rope away from the driving wheel.

[0018] In a possible design, the energy storage member is an elastic energy storage member.

[0019] In a possible design, the follower moves relative to the frame by translation or rotation.

[0020] In a possible design, the derailment guide surface is also arranged such that the distance from the axis of the driving wheel gradually decreases in the direction in which the rope is wound around the driving wheel.

[0021] In this application, the frame serves as the supporting component of the entire mechanism, and its shape and size can be designed according to actual needs. The driving wheel should be installed on the corresponding frame in a single-side support manner, so that the other side of the driving wheel is suspended to allow the rope to pass through. The follower is installed on the frame, and the follower moves or rotates relative to the frame. One end of the rope should remain connected to the driving wheel, and the other end should be directly or indirectly connected to the follower, and at least one of the connection positions at both ends of the rope is a rotation connection (because when the driving wheel rotates one circle during operation, the rope will also twist one circle, and the torsional stress of the rope needs to be released); a de-wire guide is provided on the driving wheel, and the de-wire guide is provided on the driving wheel. The guide part has a guide surface or a guide rib whose distance from the axis of the driving wheel gradually decreases from the supported side of the driving wheel to the suspended side. When the rope pulley mechanism is in operation, after the rope is wound up by the driving wheel, it will pull the driven member to move. As the rope contacts the guide surface or the guide rib in the off-line guide structure during the winding process, the rope will be guided from the wheel circumference to the suspended side. When the rope loses the support of the wheel circumference, the driven member can be reset under the action of the energy storage member. Afterwards, as the driving wheel continues to rotate, the rope will be wound up again, and then the reciprocating motion of the driven member can be realized according to the above process.

[0022] Beneficial effects:

[0023] 1. Use flexible ropes to replace gear teeth to pull the follower. When the follower fails to reset to the correct position, there will be no tooth top collision, which will cause the mechanism to get stuck and even damage the equipment.

[0024] 2. The load is always transmitted to the driving wheel through the rope, and there is no situation where the load-bearing capacity of the mechanism is weak at the beginning and end of the transmission like the traditional spring-return incomplete gear mechanism.

[0025] 3. During operation, the rope is rolled up on the driving wheel, and the driven part is driven by the rope, which takes up less space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a spring-return incomplete gear mechanism in the prior art;

[0027] Figure 2 This is a front view of a rope pulley mechanism proposed in Example 1 of the present invention;

[0028] Figure 3 A top view of a rope pulley mechanism according to Embodiment 1 of the present invention;

[0029] Figure 4 This is a schematic diagram of a rope pulley mechanism proposed in Example 1 of the present invention, in which the rope is separated from the wheel circumference and works continuously;

[0030] Figure 5 A partial cross-section of the connection between the rope and the driven member of a rope pulley mechanism proposed in Example 1 of the present invention;

[0031] Figure 6 This is a three-dimensional schematic diagram of a driving wheel of a rope pulley mechanism proposed in Example 1 of the present invention;

[0032] Figure 7 A schematic diagram of the overall structure of a high-branch shear with a rope pulley mechanism according to Embodiment 2 of the present invention;

[0033] Figure 8 An exploded view of the lower end of a rope pulley mechanism proposed in Example 2 of the present invention;

[0034] Fig. 9 A lower end front view of a rope pulley mechanism proposed in Example 2 of the present invention;

[0035] Fig.10 This is a front view of the upper end of a rope pulley mechanism proposed in Example 2 of the present invention;

[0036] Fig.11 This is a three-dimensional schematic diagram of a driving wheel of a rope pulley mechanism proposed in Example 2 of the present invention.

[0037] In the figure: 100, driving wheel; 110, off-line guide; 111, guiding surface; 112, guiding rib; 113, avoidance; 120, wheel groove; 200, rope; 210, rope head; 300, driven member; 400, energy storage member; 500, frame; 510, mounting seat; 520, connecting pipe; 530, clamp; 540, fixed blade; 600, pull rod; 610, rotary connector; 620, connecting fork; 700, motor; 800, reducer; 810, driving bevel gear; 900, bearing; 910, driven bevel gear; 920, transmission shaft; 1000, wire pulley. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Embodiment 1:

[0040] refer to Figure 1-6 :The rope pulley mechanism mainly includes a driving wheel 100, a rope 200, a driven member 300, an energy storage member 400 and a frame 500. Among them, the driving wheel 100 is rotatably mounted on the frame 500 by a single-side support, ensuring the stability and flexibility of the driving wheel 100 during operation.

[0041] The follower 300 is mounted on the frame 500 and can move relative to the frame 500. An energy storage member 400 is also provided between the follower 300 and the frame 500. The two ends of the energy storage member 400 are respectively connected to the follower 300 and the frame 500, and its main function is to reset the pulled follower 300. In this embodiment, the energy storage member 400 is preferably an elastic energy storage member, such as a spring, so as to better realize the storage and release of energy.

[0042] One end of the rope 200 is tightly connected to the circumference of the driving wheel 100, and the other end is directly or indirectly connected to the driven member 300. In this embodiment, the rope 200 passes through the driven member 300, and the diameter of the rope 200 is smaller than the through hole through which it passes, and the rope head 210 is used to limit the position so that the rope can rotate relative to the driven member. At least one of the connections at both ends of the rope 200 adopts a rotating connection. The design of this rotating connection is mainly to release the torsional stress generated on the rope 200, prevent the rope 200 from twisting and knotting due to excessive torsional stress, and improve the transmission efficiency and stability of the rope 200. In this embodiment, the rotating connection is set at the end of the rope 200 away from the driving wheel 100 to better achieve the release of torsional stress.

[0043] In addition, a de-wire guide 110 is carefully arranged on the driving wheel 100. This de-wire guide 110 has a guide surface 111 whose distance from the axis of the driving wheel 100 gradually decreases in the direction from the supported side to the suspended side of the driving wheel 100. The de-wire guide surface 111 also gradually decreases in the direction from the axis of the driving wheel 100 to the direction in which the rope 200 is wound around the driving wheel 100. Its main function is to guide the rope 200 to smoothly detach from the wheel circumference of the driving wheel 100. At the same time, the de-wire guide 110 also includes a gap 113 generated by cutting the material on the driving wheel 100. The design of this gap 113 is mainly to reduce the interference of the material on the wheel with the rope 200 when the rope 200 detaches from the wheel circumference, so as to ensure that the rope 200 can smoothly detach from the wheel circumference.

[0044] In order to further improve the transmission stability of the rope 200 on the driving wheel 100, a wheel groove 120 is further provided on the circumference of the driving wheel 100. The design of the wheel groove 120 enables the rope 200 to be more stably attached to the circumference of the driving wheel 100, reducing the slip and friction of the rope 200 during the transmission process. At the same time, the wheel groove 120 ends before the derailment guide 110, making it easier for the rope 200 to detach from the circumference, further improving the stability and reliability of the entire rope pulley mechanism.

[0045] Embodiment 2:

[0046] refer to Figure 7-11 : In this embodiment, the rope pulley mechanism can be used in a variety of tools; there is a high branch shear, the frame 500 is composed of a mounting seat 510, a connecting pipe 520, a hoop 530, and a fixed blade 540. In this embodiment, the driven member 300 is a moving blade, the mounting seat 510 and one end of the connecting pipe 520 are fixedly connected, the hoop 530 is fixedly sleeved on the outer wall of the connecting pipe 520 and the hoop 530 is located at one end of the connecting pipe 520 away from the mounting seat 510, the fixed blade 540 is fixedly connected to the connecting pipe 520 through the hoop 530, the mounting seat 510, the connecting pipe 520, the hoop 530, and the fixed blade 540 are fixedly connected to each other to form an integrated frame 500.

[0047] The follower 300 and the fixed blade 540 are rotatably connected, and the fixed blade 540 and the follower 300 cooperate to complete the shearing of branches. An energy storage member 400 is arranged between the follower 300 and the fixed blade 540. In this embodiment, the energy storage member 400 is a tension spring, one end of the energy storage member 400 is connected to the corner of the follower 300, and the other end of the energy storage member 400 is connected to the tail bracket of the fixed blade 540. The energy storage member 400 can provide continuous traction and reset for the follower 300.

[0048] Furthermore, a bearing 900 is fixedly embedded inside the mounting seat 510, and a driving wheel 100 and a driven bevel gear 910 are respectively arranged on both sides of the mounting seat 510. A transmission shaft 920 is fixedly passed through the inner ring of the bearing 900, and the transmission shaft 920 is fixedly passed through the driving wheel 100 and the driven bevel gear 910 to achieve synchronous rotation of the driving wheel 100 and the driven bevel gear 910.

[0049] Furthermore, a reducer 800 is fixedly mounted on one end of the mounting base 510, a motor 700 is fixedly mounted on one end of the reducer 800, an output shaft of the motor 700 is fixedly connected to an input shaft of the reducer 800, an output shaft of the reducer 800 is fixedly connected to a driving bevel gear 810, the driving bevel gear 810 is meshed with a driven bevel gear 910, and thus the driving wheel 100 can be driven to rotate.

[0050] Further, the outer surface of the driving wheel 100 close to the frame 500 is detachably mounted with the rope 200, and the driving wheel 100 can complete the winding of the rope 200. The outer wall of the mounting seat 510 is rotatably mounted with the wire wheel 1000, and the wire wheel 1000 is used to ensure the stable movement of the rope 200, and at the same time, it can also ensure that it is more stably wound on the driving wheel 100. The outer surface of the driving wheel 100 close to the frame 500 is provided with a guide rib 112, which can rotate synchronously with the driving wheel 100. The distance from the guide rib 112 to the axis of the driving wheel 100 from the supported side of the driving wheel 100 to the suspended side gradually decreases, and the rope 200 can be guided to leave the peripheral surface of the driving wheel 100. The guide rib 112 is detachable, which is convenient for processing and manufacturing, and can be easily replaced after wear.

[0051] Furthermore, the other end of the rope 200 passes through the interior of the connecting tube 520 and is rotatably connected to the pull rod 600 through the rotary connector 610. The other end of the pull rod 600 is fixedly installed with a connecting fork 620, and the connecting fork 620 is rotatably connected to the protruding portion of the driven member 300. By pulling the rope 200, the driven member 300 and the fixed blade 540 can be brought close to each other, thereby achieving shearing of the high branch shears.

[0052] In this embodiment, when the high-branch shears are in use, the motor 700 drives the reducer 800, and the active bevel gear 810 on the output shaft of the reducer 800 can drive the driven bevel gear 910 on the mounting seat 510 to rotate, and then the synchronous rotation of the active wheel 100 can be achieved through the transmission shaft 920; when the active wheel 100 rotates, the rope 200 is wrapped around its wheel circumference, and the rope 200 drives the driven member 300 through the rotary connector 610, the pull rod 600, and the connecting fork 620, and the driven member 300 cooperates with the fixed blade 540 to complete the shearing; when the active wheel 100 rotates to a certain position, the guide ribs 112 on the off-line guide part 110 thereon can make the rope 200 detach from the wheel circumference, and at this time the driven member 300 is reset under the action of the energy storage member 400; after the motor 700 stops, the active wheel 100 stops accordingly, waiting for the next shearing.

[0053] Furthermore, when the knife is stuck (the driven member 300 is stuck and cannot be fully opened), the rope 200 is in a tension-free and relaxed state. When the driving wheel 100 rotates, the rope 200 slides from the suspended side of the driving wheel 100 and cannot be normally wound around the wheel circumference and is reeled up by the driving wheel 100. The driving wheel 100 rotates idly and the driven member 300 does not move. In this case, the rope pulley mechanism will not have a phenomenon similar to a spring-reset incomplete gear mechanism in which the tooth tops collide when the driven gear or rack is not normally reset, thereby damaging the mechanism. This effectively ensures the safe and stable use of the tool and facilitates maintenance. Compared with the existing structure, it has certain advantages.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rope pulley mechanism, characterized in that: It comprises a driving wheel (100), a rope (200), a driven member (300), an energy storage member (400), and a frame (500); The driving wheel (100) is rotatably mounted on the frame (500) in a single-side supporting manner; The driven member (300) is mounted on the frame (500) and moves relative to the frame (500); an energy storage member (400) is further provided between the driven member (300) and the frame (500); two ends of the energy storage member (400) are respectively connected to the driven member (300) and the frame (500); One end of the rope (200) is connected to the driving wheel (100) via the circumferential surface of the driving wheel (100), and the other end is directly or indirectly connected to the driven member (300), and at least one end of the rope (200) is a rotational connection for releasing torsional stress on the rope (200); The driving wheel (100) is also provided with a de-wire guide portion (110), the de-wire guide portion (110) having a guide surface (111) or a guide convex rib (112) whose distance from the axis of the driving wheel (100) gradually decreases from the supported side to the suspended side of the driving wheel (100), and is used to guide the rope (200) to separate from the peripheral surface of the driving wheel (100).

2. A rope pulley mechanism according to claim 1, characterized in that: The derailment guide (110) further comprises a clearance (113) generated by cutting material on the driving wheel (100), so as to reduce interference of the material on the wheel with the rope (200) when the rope (200) is separated from the wheel circumference.

3. A rope pulley mechanism according to claim 1, characterized in that: A wheel groove (120) is also provided on the circumferential surface of the driving wheel (100).

4. A rope pulley mechanism according to claim 3, characterized in that: The wheel groove (120) ends before approaching the de-wire guide portion (110), so that the rope (200) can be easily decoupled from the wheel circumference.

5. A rope pulley mechanism according to claim 1, characterized in that: A rotation connection for releasing the torsional stress on the rope (200) is arranged at one end of the rope (200) away from the driving wheel (100).

6. A rope pulley mechanism according to claim 1, characterized in that: The energy storage component (400) is an elastic energy storage component.

7. A rope pulley mechanism according to claim 1, characterized in that: The driven member (300) moves relative to the frame (500) by moving or rotating.

8. A rope pulley mechanism according to claim 1, characterized in that: The derailment guide surface (111) is also arranged such that the distance from the axis of the driving wheel (100) gradually decreases in the direction in which the rope (200) is wound around the driving wheel (100).

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