A two-stage cam unlocking structure for a pulley block

Abstract

The utility model relates to a double -segment cam unlocking structure for pulley block, including first cover, second cover, rotary connection axle, rope wheel and unlocking portion, the first cover lower part place is set up on the second cover through rotary connection axle rotation, the rope wheel sets up on the drive shaft, the rope wheel is located first cover far from second cover one side department, first cover far from second cover one side is equipped with the line pressure structure, the unlocking portion includes cam connecting axle, first cam, first cam follow -up axle, second cam, second cam follow -up axle. The first cam and second cam in the application set, make unlocking structure movement stroke bigger, and the rotation angle of second cam is small, make whole unlocking structure volume is small, reduce the volume of pulley block, can be convenient, fast realization between rope wheel and line pressure structure unlocking operation, leave the full operation space to the installation and take down of the rope on the rope wheel, greatly improved the installation and take down efficiency of the rope.

Description

Technical Field

[0001] This utility model relates to an unlocking structure, and more particularly to a double-cam unlocking structure for a pulley system. Background Technology

[0002] In the current high-altitude work industry, the main method used is to manually descend to the working height using safety ropes. The entire process is difficult and dangerous, and requires high skills from the operators. Against this background, a multi-functional pulley block was developed. It uses an electric drill as a power source to transmit power to the multi-functional pulley block, which in turn transmits power to the rope through an internal mechanism. Ultimately, the multi-functional pulley block automatically lifts the operator from the ground to the working height.

[0003] Before using a pulley system, ropes need to be installed, or the ropes need to be replaced after a period of use. Existing pulley systems are compact and small in size. In order to improve the efficiency of rope installation and removal without affecting the safety of normal use of the pulley system, an unlocking structure is needed to facilitate the installation or removal of ropes. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a double-stage cam unlocking structure for pulley systems.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a double-stage cam unlocking structure for pulley blocks, including a first cover, a second cover, a rotary connecting shaft, a rope wheel, and an unlocking part; A rotating connecting shaft is fixedly provided at the lower part of the second cover, and the lower part of the first cover is rotatably mounted on the second cover via the rotating connecting shaft; The rope wheel is mounted on the drive shaft, which passes through the first cover and the second cover in sequence. The rope wheel is located on the side of the first cover away from the second cover. The side of the first cover away from the second cover is provided with a pressing structure. The pressing structure is located on one side of the rope wheel and is arranged along the outer contour of the rope wheel. The rope wheel has a rope winding space on its circumference. A rope is wound in the rope winding space. One end of the rope extends out of the rope wheel and is pressed by the pressing structure. The unlocking part includes a cam connecting shaft, a first cam, a first cam follower shaft, a second cam, and a second cam follower shaft; the cam connecting shaft is rotatably disposed through the second cover, and a first cam is fixedly disposed on the end of the cam connecting shaft near the first cover. The first cam is provided with a driving step, and a second cam is also sleeved on the end of the cam connecting shaft near the first cover. The second cam is higher than the first cam and lower than the driving step. The first cam follower shaft and the second cam follower shaft are both disposed on the side of the first cover facing the second cover, and the first cam follower shaft is longer than the second cam follower shaft. The first cam is matched with the first cam follower shaft, and the second cam is matched with the second cam follower shaft. A handle is provided on the end of the cam connecting shaft away from the first cover, and a torsion spring is provided inside the handle; When the handle is turned by an external force, the handle drives the first cam to rotate, which in turn drives the first cam to move along the follower shaft. The drive step on the first cam presses against the second cam, which in turn drives the second cam to move along the follower shaft. Ultimately, the first cover rotates along the second cover via the rotary connecting shaft.

[0006] In a preferred embodiment of the present invention, the second cover is provided with a first cam track groove and a second cam track groove on the side facing the first cover, and the second cam track groove is set higher than the first cam track groove; The first cam is disposed in the first cam track groove, and the second cam is disposed in the second cam track groove. The first cam track groove is provided with a first follower shaft track groove, and the second cam track groove is provided with a second follower shaft track groove. The first cam follower shaft moves along the first cam track groove, and the second cam follower shaft is located in the second cam track groove after it moves into place.

[0007] In a preferred embodiment of the present invention, the second cover is provided with a rotating swing shaft on the side facing the first cover, and the first cover is provided with an arc groove and a drive shaft moving groove, and the rotating swing shaft is disposed in the arc groove; A pulley is provided after the drive shaft passes through the drive shaft moving groove.

[0008] In a preferred embodiment of the present invention, the pressure structure is located on the rope exit side of the rope wheel. The pressure structure includes multiple pressure shafts, which are arranged around the outer contour of the rope wheel. Each pressure shaft is provided with a pressure sleeve. The multiple pressure sleeves abut against the rope when in use and move away from the rope when unlocked.

[0009] The beneficial effects of this utility model are as follows: The setting of the first cam and the second cam in this application makes the movement stroke of the unlocking structure larger, and the rotation angle of the second cam is small, which makes the overall unlocking structure smaller and reduces the volume of the pulley group. It can conveniently and quickly realize the unlocking operation between the rope wheel and the pressing structure, drive the pressing structure away from the rope wheel, leave sufficient operating space for the installation and removal of the rope on the rope wheel, and make unlocking convenient and safe, easy to operate, and greatly improve the efficiency of rope installation and removal. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1; Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of this utility model. Figure 3 ; Figure 4 This is a schematic diagram of the structure of this utility model. Figure 4 ; Figure 5 This is a schematic diagram of the second housing structure of this utility model. Figure 1 ; Figure 6 This is a schematic diagram of the second housing structure of this utility model. Figure 2 ; Figure 7 This is a schematic diagram of the first housing structure of this utility model. Figure 1 ; Figure 8 This is a schematic diagram of the first housing structure of this utility model. Figure 2 ; Figure 9 This is a schematic diagram of the handle structure; Figure 10 This is a diagram showing the relationship between the rope's rising state and the position of the rope sheave when the cable pressing structure is used in a pulley system. In the figure: First cover 1; First cam track groove 101; Second cam track groove 102; First follower shaft track groove 103; Second follower shaft track groove 104; Second cover 2; Rotary connecting shaft 3; Rope wheel 4; Wire pressing structure 5; Wire pressing shaft 501; Wire pressing sleeve 502; Rope winding space 6; Rope 7; Cam connecting shaft 8; First cam 9; Drive step 901; First cam follower shaft 10; Second cam 11; Second cam follower shaft 12; Handle 13; Rotary swing shaft 14; Arc groove 15; Drive shaft moving groove 16; Torsion spring 17; Drive shaft 18. Detailed Implementation

[0011] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0012] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0013] like Figures 1 to 10 The diagram shows a double-cam unlocking structure for a pulley block, comprising a first housing 1, a second housing 2, a rotary connecting shaft 3, a rope wheel 4, and an unlocking part; A rotating connecting shaft 3 is fixedly provided at the lower part of the second cover 2, and the lower part of the first cover 1 is rotatably mounted on the second cover 2 through the rotating connecting shaft 3; The pulley 4 is mounted on one end of the drive shaft 18. The other end of the drive shaft 18 passes through the first housing 1 and the second housing 2 in sequence and is connected to the power input mechanism. The pulley 4 is located on the side of the first housing 1 away from the second housing 2. A pressure structure 5 is provided on the side of the first housing 1 away from the second housing 2. The pressure structure 5 is located on one side of the pulley 4 and is arranged along the outer contour of the pulley 4. A rope winding space 6 is provided on the circumference of the pulley 4. A rope 7 is wound in the rope winding space 6. One end of the rope 7 extends out of the pulley 4 and is pressed by the pressure structure 5. In this application, the rope 7 is squeezed by the pressure structure 5, so that the rope 7 is restricted between the pulley 4 and the pressure structure 5, ensuring the safety of the pulley group lifting the worker by the pulley and avoiding the rope 7 slipping off the pulley 4. One end of the rope 7 extends out of the rope wheel 4, is pressed by the wire pressing structure 5, and then moves downward. The other end of the rope 7 is connected to a high place. The drive shaft 18 is connected to the power input mechanism. The drive shaft 18 is driven to rotate through the power input mechanism, which in turn drives the rope wheel 4 to rotate, so as to realize the transmission of the rope wheel 4 to the rope 7. The unlocking part includes a cam connecting shaft 8, a first cam 9, a first cam follower shaft 10, a second cam 11, and a second cam follower shaft 12; the cam connecting shaft 8 is rotatably mounted on the second cover 2, and the first cam 9 is fixedly mounted on the end of the cam connecting shaft 8 near the first cover 1. The first cam 9 is provided with a driving step 901, and the second cam 11 is also sleeved on the end of the cam connecting shaft 8 near the first cover 1. The second cam 11 is set higher than the first cam 9 and lower than the driving step 901; The first cam follower shaft 10 and the second cam follower shaft 12 are both disposed on the side of the first cover 1 facing the second cover, and the first cam follower shaft 10 is longer than the second cam follower shaft 12. The first cam 9 is matched with the first cam follower shaft 10, and the second cam 11 is matched with the second cam follower shaft 12. The cam connecting shaft 8 is provided with a handle 13 at the end away from the first cover 1; a torsion spring 17 is provided inside the handle 13. When the handle 13 is rotated by an external force, the handle 13 drives the first cam 9 to rotate, which in turn drives the first cam to move along the follower shaft 10. The drive step 901 on the first cam 9 presses against the second cam 11, which in turn drives the second cam to move along the follower shaft 12. Ultimately, the first cover 1 rotates along the second cover 2 via the rotary connecting shaft 3.

[0014] When it is necessary to install or remove the rope from the rope pulley 4 for replacement, the unlocking part must be opened to complete the installation or removal operation of the rope 7. Specifically, rotating the handle 13, since the handle 13 is connected to the cam connecting shaft 8, and the first cam 9 is fixedly mounted on the cam connecting shaft 9, means that the rotation of the handle 13 drives the cam connecting shaft 8 to rotate, which in turn drives the first cam 9 to rotate. During the rotation, the first cam 9 continuously presses against the first cam follower shaft 10, causing the first cam follower shaft 10 to move to the lower right. During the movement of the first cam follower shaft 10 to the lower right, it drives the first cover 1 to rotate along the rotating connecting shaft 3. During the rotation of the first cam 9, it drives the drive step 901 on the first cam 9 to rotate synchronously. When the first cam 9 reaches its movement trajectory, the drive step 901 and the second When the cam 11 contacts the first cam 9 and the first cam 9 rotates continuously, the driving step 901 further presses the second cam 11, causing the second cam 11 to press the second cam follower shaft 12, causing the second cam follower shaft 12 to move to the lower right. Since the first cam follower shaft 10 and the second cam follower shaft 12 are both set on the first cover 1, and the first cover 1 and the second cover 2 are connected by a rotary connecting shaft 3, the first cover 1 moves to the lower right continuously. Since the pressure structure 5 is set on the first cover 1, the pressure structure 5 moves to the lower right, increasing the distance between the pressure structure 5 and the rope wheel 4, making it easier to install or remove the rope 7.

[0015] Once the rope is installed, the handle 13 contains a torsion spring 17. Releasing the handle 13 causes the cam connecting shaft 8 to reset under the action of the torsion spring 17, preparing for the next unlocking. When using the pulley system after the rope is installed, the rope 7 winds counterclockwise along the rope wheel 4, passes through the top of the pressure structure 5, and moves downward, causing the pulley system to rise. This allows the pulley system to lift the worker. As the rope 7 moves downward through the top of the pressure structure 5, it is compressed by the worker's own weight, pressing the pressure structure 5 downward and towards the rope wheel 4, ultimately resetting the pressure structure 5 and clamping the rope 7 between the rope wheel 4 and the pressure structure 5.

[0016] This invention provides an unlocking part between the first and second covers, which increases the distance between the pressing structure 5 and the rope wheel 4, providing ample operating space for the installation and removal of the rope wheel. The first cam 9 and second cam 11 on the second cover 2, and the first cam follower shaft 10 and second cam follower shaft 12 on the first cover 1, ensure that after the first cam 9 presses the first cam follower shaft 10 into place along its movement trajectory, the driving step 901 on the first cam 9 presses the second cam 11 along its movement trajectory, pressing the second cam follower shaft 12. This causes the first cover 1 to continue rotating along the rotating connecting shaft 3, increasing the distance between the first cover 1 and the second cover 2, thereby increasing the distance between the pressing structure and the rope wheel. Compared to a structure that uses only one cam structure to squeeze the cam follower shaft and thus make the first cover 1 rotate along the second cover, the setting of the first cam 9 and the second cam 11 in this application makes the unlocking structure have a larger stroke and the rotation angle of the second cam 11 is smaller, making the entire unlocking structure smaller and reducing the volume of the pulley group. This allows for convenient and quick unlocking operations between the rope wheel 4 and the pressure wire structure.

[0017] In a preferred embodiment, the second housing 2 in this application is provided with a first cam track groove 101 and a second cam track groove 102 on the side facing the first housing 1, and the second cam track groove 102 is set higher than the first cam track groove 101; The first cam 9 is disposed in the first cam track groove 101, and the second cam 11 is disposed in the second cam track groove 102. The first cam track groove 101 is provided with a first follower shaft track groove 103, and the second cam track groove 102 is provided with a second follower shaft track groove 104. The first cam follower shaft 10 moves along the first cam track groove 101, and the second cam follower shaft 12 moves into position and is located in the second follower shaft track groove 104.

[0018] The first cam track groove 101 in this application provides a limiting space for the rotation of the first cam 9, ensuring that the first cam 9 rotates within the first cam track groove 101, thus ensuring the safety and stability of the rotation of the first cam 9; the second cam track groove 102 provides space for the rotation of the second cam 11, ensuring the stability of the rotation of the second cam 11. The first follower shaft track groove 103 provides space for the rotation of the first cam follower shaft 10, and the second follower shaft track groove 104 limits the second cam follower shaft 12, ensuring the rotation angle and stability of the second cam follower shaft 12. By rotating the first cam 9 and the second cam 11, the first cam 9 squeezes the first cam follower shaft 10, and the second cam 11 squeezes the second cam follower shaft 12, thus moving the squeezed first cam follower shaft 10 and the second cam follower shaft 12 to the lower right. Since the first cam follower shaft 10 and the second cam follower shaft 12 are set on the first cover 1, the first cam follower shaft 10 and the second cam follower shaft 12 drive the first cover 1 to rotate. Since the first cover 1 is provided with a pressing structure 5, and the first cover 1 and the second cover 2 are connected by a rotating connecting shaft 3, the first cover 1 finally drives the pressing structure 5 to rotate along the rotating shaft 3, which increases the distance between the pressing structure 5 and the rope wheel 4, making it easier to remove the rope 7 from the rope wheel 4 or install the rope 7 on the rope wheel 4.

[0019] In a preferred embodiment, the second cover 2 of this application is provided with a rotating swing shaft 14 on the side facing the first cover 1, the first cover 1 is provided with an arc groove 15 and a drive shaft moving groove 16, the rotating swing shaft 14 is disposed in the arc groove 15; the drive shaft passes through the drive shaft moving groove 16 and is provided with a rope wheel 4.

[0020] As the first cover 1 moves the pressure structure to the lower right, the arc groove 15 on the first cover 1 moves to the right along the rotation amplitude axis 14, and at the same time, the drive shaft moving groove 16 on the first cover 1 moves to the right along the drive shaft 18 connecting the rope wheel 4. This ensures the stability of the first cover 1 rotating along the second cover 2. At the same time, the arc groove 15 limits the rotation amplitude axis 14, ensuring the rotation angle of the first cover 1 and improving the stability and safety of the rotation between the first cover 1 and the second cover 2.

[0021] In a preferred embodiment, the pressure structure is located on the rope exit side of the rope wheel 4. The pressure structure includes multiple pressure shafts 501, which are arranged around the outer contour of the rope wheel 4. Each pressure shaft 501 is provided with a pressure sleeve 502. The multiple pressure sleeves 502 abut against the rope in the use state and move away from the rope in the unlocked state.

[0022] The wire pressing structure described in this application is located on the rope exit side of the rope pulley 4. The wire pressing sleeve 17 rotates along the corresponding wire pressing shaft 16. The wire pressing sleeve 17 is set up so that the rope can be transmitted by rotating along the wire pressing shaft 16 during the process of pressing and limiting the rope. Multiple wire pressing sleeves 17 abut against the rope in the use state and move away from the rope in the unlocked state.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A double-stage cam unlocking structure for a pulley system, characterized in that, It includes a first housing (1), a second housing (2), a rotating connecting shaft (3), a rope wheel (4), and an unlocking part; A rotating connecting shaft (3) is fixedly provided at the lower part of the second cover (2), and the lower part of the first cover (1) is rotatably mounted on the second cover (2) through the rotating connecting shaft (3); The rope wheel (4) is mounted on the drive shaft, which passes through the first cover (1) and the second cover (2) in sequence. The rope wheel (4) is located on the side of the first cover (1) away from the second cover (2). A pressure structure (5) is provided on the side of the first cover (1) away from the second cover (2). The pressure structure (5) is located on one side of the rope wheel (4) and is arranged along the outer contour of the rope wheel (4). A rope winding space (6) is provided on the circumference of the rope wheel (4). A rope (7) is wound in the rope winding space (6). One end of the rope (7) extends out of the rope wheel (4) and is pressed by the pressure structure (5). The unlocking part includes a cam connecting shaft (8), a first cam (9), a first cam follower shaft (10), a second cam (11), and a second cam follower shaft (12); the cam connecting shaft (8) is rotatably disposed on the second cover (2), and the first cam (9) is fixedly disposed on the end of the cam connecting shaft (8) near the first cover (1), and the first cam (9) is provided with a driving step (901). The second cam (11) is also sleeved on the end of the cam connecting shaft (8) near the first cover (1), and the second cam (11) is set higher than the first cam (9) and lower than the driving step (901); The first cam follower shaft (10) and the second cam follower shaft (12) are both disposed on the side of the first cover (1) facing the second cover, and the first cam follower shaft (10) is longer than the second cam follower shaft (12). The first cam (9) is matched with the first cam follower shaft (10), and the second cam (11) is matched with the second cam follower shaft (12). The cam connecting shaft (8) is provided with a handle (13) at the end away from the first cover (1), and a torsion spring (17) is provided inside the handle (13). When the external force rotates the handle (13), the handle (13) drives the first cam (9) to rotate and drives the first cam follower shaft (10) to move. The drive step (901) on the first cam (9) squeezes the second cam (11) and drives the second cam follower shaft (12) to move. Finally, the first cover (1) rotates along the second cover (2) through the rotating connecting shaft (3).

2. The double-stage cam unlocking structure for a pulley system according to claim 1, characterized in that, The second cover (2) is provided with a first cam track groove (101) and a second cam track groove (102) on the side facing the first cover (1), and the second cam track groove (102) is set higher than the first cam track groove (101); The first cam (9) is disposed in the first cam track groove (101), and the second cam (11) is disposed in the second cam track groove (102). The first cam track groove (101) is provided with a first follower shaft track groove (103), and the second cam track groove (102) is provided with a second follower shaft track groove (104). The first cam follower shaft (10) moves along the first cam track groove (101), and the second cam follower shaft (12) is located in the second cam track groove (102) after it moves into place.

3. The double-stage cam unlocking structure for a pulley system according to claim 1, characterized in that, The second cover (2) is provided with a rotating swing shaft (14) on the side facing the first cover (1), and the first cover (1) is provided with an arc groove (15) and a drive shaft moving groove (16), and the rotating swing shaft (14) is disposed in the arc groove (15); The drive shaft passes through the drive shaft moving groove (16) and is then provided with a rope wheel (4).

4. The double-stage cam unlocking structure for a pulley system according to any one of claims 1-3, characterized in that, The pressure structure is located on the rope exit side of the rope wheel (4). The pressure structure includes multiple pressure shafts (501). The multiple pressure shafts (501) are arranged along the outer circumference of the rope wheel (4), and each pressure shaft (501) is provided with a pressure sleeve (502). The multiple pressure sleeves (502) abut against the rope when in use and move away from the rope when unlocked.

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