Movable pulley device

Abstract

The utility model provides a movable pulley device, which relates to the technical field of lifting devices, the movable pulley device comprises a movable pulley shaft, at least one end movable pulley and a driving mechanism, the movable pulley shaft comprises a fixed shaft section and a telescopic shaft section which are connected with each other, and the telescopic shaft section is connected with the driving mechanism; wherein at least one end movable pulley is fixed to the end of the movable pulley shaft, the driving mechanism drives the telescopic shaft section to achieve axial extension or shortening so as to drive the end movable pulley to move in the rope outlet point changing direction of the first steel wire rope on the winding drum, and the first steel wire rope is a steel wire rope winding around the end movable pulley and the winding drum. The deflection angle of the steel wire rope in the working process of the movable pulley device can be reduced, the safety of the movable pulley device is improved, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lifting device technology, and more specifically, to a movable pulley device. Background Technology

[0002] In a hydropower station's gate hoist system, a moving pulley system drives the winding and unwinding of a wire rope via a rotating drum, thus raising and lowering the hoist. As the wire rope winds around the end moving pulley and drum, its entry and exit angles constantly change with the movement of the moving pulley system. Especially when the drum is long, the deflection angle of the wire rope on the end moving pulley may exceed the allowable range. An excessively large deflection angle causes the wire rope to bend excessively when passing over the moving pulley, subjecting it to greater bending stress and accelerating fatigue damage. This not only affects the safety and service life of the wire rope but may also lead to the risk of wire rope breakage, threatening the normal operation of the equipment.

[0003] Currently, common optimization methods for addressing the problem of excessive wire rope skew angles include shortening the drum length or adjusting its installation position to reduce the skew angle. However, in practical engineering applications, these methods are often difficult to implement due to equipment structure limitations, or the adjustment costs are too high to meet actual needs. Utility Model Content

[0004] The problem solved by this invention is how to reduce the deflection angle of the wire rope during the operation of the movable pulley device, thereby improving the safety and service life of the movable pulley device.

[0005] To solve the above problems, this utility model provides a movable pulley device, including a movable pulley shaft, at least one end movable pulley, and a drive mechanism. The movable pulley shaft includes a fixed shaft section and a telescopic shaft section connected to each other, and the telescopic shaft section is connected to the drive mechanism.

[0006] At least one of the end movable pulleys is fixed to the end of the movable pulley shaft, and the drive mechanism drives the telescopic shaft section to extend or shorten axially, so as to drive the end movable pulley to move along the direction of the change of the rope exit point of the first wire rope on the drum. The first wire rope is a wire rope that passes through the end movable pulley and the drum.

[0007] Optionally, it also includes an intermediate movable pulley, which is mounted on a fixed shaft section of the movable pulley shaft and is used to guide the second wire rope to run. The second wire rope is a wire rope that winds around the intermediate movable pulley and the drum.

[0008] Optionally, the intermediate movable pulley is connected to the movable pulley shaft via a first bearing, and the extension and retraction of the telescopic shaft section drives the end movable pulley to move axially along the movable pulley shaft.

[0009] Optionally, the driving mechanism is a hydraulic driving mechanism, and the telescopic shaft section is a telescopic hydraulic cylinder, and the hydraulic driving mechanism comprises a hydraulic oil pipe and a hydraulic oil pump.

[0010] The hydraulic cylinder is in communication with the hydraulic oil pump through the hydraulic oil pipe.

[0011] Optionally, the movable pulley shaft is composed of a first movable pulley shaft unit and a second movable pulley shaft unit fixedly connected through a shaft coupling, and the first movable pulley shaft unit and the second movable pulley shaft unit are arranged in a central symmetry along the movable pulley shaft, and the axis of the first movable pulley shaft unit and the axis of the second movable pulley shaft unit coincide.

[0012] Optionally, the first movable pulley shaft unit and the second movable pulley shaft unit each comprise a fixed shaft section and a telescopic shaft section connected with each other, and the number of the end movable pulley shafts is two, and the number of the end movable pulleys is two, one of which is arranged on the first movable pulley shaft unit, and the other of which is arranged on the second movable pulley shaft unit, and the telescopic shaft section is located between the two end movable pulleys.

[0013] Optionally, the fixed shaft section of the first movable pulley shaft unit and the fixed shaft section of the second movable pulley shaft unit each comprise an end movable pulley fixed shaft section, an intermediate movable pulley fixed shaft section and a shaft coupling fixed shaft section connected in sequence, and the end movable pulley fixed shaft section, the telescopic shaft section, the intermediate movable pulley fixed shaft section and the shaft coupling fixed shaft section are connected in sequence.

[0014] Optionally, the end movable pulley is fixed on the end movable pulley fixed shaft section through a second bearing, and the intermediate movable pulley is fixed on the intermediate movable pulley fixed shaft section.

[0015] Optionally, further comprising a hydraulic grab beam connected with the intermediate movable pulley fixed shaft section, and the hydraulic oil pump is connected with the hydraulic grab beam and the telescopic shaft section respectively.

[0016] Optionally, further comprising a sliding end shield, a fixed end shield, a shaft stop plate and a bolt.

[0017] Optionally, the sliding end shield is fixedly arranged on the end movable pulley fixed shaft section and is sleeved on the periphery of the end movable pulley, the fixed end shield is sleeved on the periphery of the telescopic shaft section, part of the sliding end shield and the fixed end shield overlap, the end movable pulley fixed shaft section is provided with a slot, the shaft stop plate is fixed on the end movable pulley fixed shaft section through the bolt, and the shaft stop plate is located on the side of the sliding end shield close to the end of the movable pulley shaft.

[0018] Optionally, further comprising a hanging plate and an intermediate shield.

[0019] The intermediate movable pulley fixed shaft section is provided with an intermediate movable pulley, and the intermediate shield is sleeved on the periphery of the intermediate movable pulley.

[0020] Compared with the prior art, the beneficial effects of the utility model are that: through dividing the movable pulley shaft into a fixed shaft section and a telescopic shaft section, and controlling the extension and shortening of the telescopic shaft section through a driving mechanism, the end movable pulley on the movable pulley shaft is driven to move along the change direction of the wire rope out of the winding drum, so that the cutting angle of the wire rope can be controlled within a target range, and the transition bending of the wire rope is avoided. For example, when the movable pulley is in a descending state, the wire rope out of the winding drum moves along the end of the winding drum to the center, at this time, the telescopic shaft section is contracted under the control of the driving structure, so as to reduce the change range of the relative position of the end movable pulley compared with the wire rope out of the winding drum, thereby achieving the purpose of controlling the deflection angle of the wire rope, and reducing the fatigue damage of the wire rope, and prolonging the service life of the movable pulley device. The utility model can reduce the deflection angle of the wire rope in the working process of the movable pulley device, and improve the safety and service life of the movable pulley device. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A scene schematic view of a movable pulley device provided for the utility model embodiment is shown in the figure.

[0022] Figure 2 Another structure schematic view of a movable pulley device provided for the utility model embodiment is shown in the figure.

[0023] Figure 3 A structure schematic view of a movable pulley shaft in a movable pulley device provided for the utility model embodiment is shown in the figure.

[0024] The figure mark explanation: 1-movable pulley device, 101-movable pulley shaft, 101a-first movable pulley shaft unit, 101b-second movable pulley shaft unit, 1011-fixed shaft section, 1012-telescopic shaft section, 10111-end movable pulley fixed shaft end, 10112-intermediate movable pulley fixed shaft section, 10113-coupling fixed shaft section, 102-end movable pulley, 103-intermediate movable pulley, 104-driving mechanism, 1041-hydraulic oil pipe, 1042-hydraulic oil pump, 105-sliding end shield, 106-stopping shaft plate, 107-hanging plate, 108-coupling, 109-fixed end shield, 110-intermediate shield, 2-hydraulic grab beam, 3-winding drum, 41-first wire rope (initial position), 41'-first wire rope (terminal position), 42-second wire rope. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be apparently and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Reference to "an embodiment" in this document means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are combinable with other embodiments.

[0027] In the water power station opening and closing system, the dynamic pulley device, the reel and the hydraulic grab beam jointly act to control the winding and unwinding of the steel wire rope, realizing the opening and closing of the gate. Among them, the reel is responsible for driving the winding of the steel wire rope, and the dynamic pulley device is used to guide the running track of the steel wire rope, ensuring that it transmits tension along the predetermined path. The hydraulic grab beam is used to cooperate with the hoist to complete the opening and closing operation of the gate, and provides the required power through the hydraulic drive system. However, in actual operation, the running track of the steel wire rope is not fixed, but is affected by the position of the reel, the change of the wire outlet point and the position of the dynamic pulley. Especially in the case of long reel or large change of wire outlet point, the deflection angle of the steel wire rope on the end dynamic pulley may exceed the design range.

[0028] The deflection angle of the steel wire rope refers to the angle formed between the steel wire rope and the ideal tensile direction. In the dynamic pulley device, the steel wire rope usually runs along the surface of the drum or pulley, and the deflection angle refers to the deviation of the steel wire rope from the expected running path (usually vertical or horizontal direction) when passing through the dynamic pulley, reel or other guide components.

[0029] When the deflection angle of the steel wire rope is too large, the steel wire rope passing through the dynamic pulley will bear a large bending stress, causing the local stress of the steel wire rope to increase, leading to the aggravation of the fatigue damage of the steel wire rope, and even the rupture of the steel wire rope, affecting the normal operation of the hoist system. In addition, the excessive deflection angle may also generate additional transverse force between the steel wire rope and the dynamic pulley and the reel, causing the running track of the steel wire rope to deviate, affecting the stability of the hoist, and possibly interfering with the operation of the hydraulic grab beam.

[0030] To solve this problem, in existing engineering, the running track of the steel wire rope is usually optimized by adjusting the position of the winding drum, shortening the length of the winding drum or increasing the guide wheel. However, these methods are often limited by factors such as device structure, installation space, etc., and it is difficult to effectively control the deflection angle of the steel wire rope without changing the main structure of the hoist.

[0031] With reference to Figure 1 and Figure 2 The utility model provides a movable pulley device 1, including movable pulley axle 101, at least one end movable pulley 102 and drive mechanism 104, movable pulley axle 101 includes fixed axle section 1011 and telescopic axle section 1012 who are connected with each other, telescopic axle section 1012 is connected with drive mechanism 104.

[0032] Among them, at least one end movable pulley 102 is fixed in the end of movable pulley axle 101, drive mechanism 104 drives telescopic axle section 1012 realizes axial elongation or shortening to drive end movable pulley 102 moves along the change direction of the out rope point of winding drum 3 along first steel wire rope 41, so that the deflection angle of first steel wire rope 41 when winding into and out of end movable pulley 102 is kept in the target range, and first steel wire rope 41 is the steel wire rope winding through end movable pulley 102 and winding drum 3.

[0033] Specifically, in the water power station hoist system, winding drum 3 is the core component for storing and winding and unwinding the steel wire rope in the hoist, winding drum 3 rotates through drive mechanism 104, drives the winding and unwinding of the steel wire rope to ensure that the steel wire rope can be pulled and retracted according to the predetermined path. The length and position of winding drum 3 determine the winding and unwinding angle (i.e. deflection angle) of the steel wire rope. With the lifting of the hoist, the out rope point position of winding drum 3 changes, and the in rope and out rope angle of the steel wire rope changes accordingly.

[0034] The steel wire rope is used to connect various components of the hoist and is wound and unwound through winding drum 3 and movable pulley device 1. In the operation process of the hoist, the steel wire rope needs to pass through end movable pulley 102 and other possible movable pulley devices 1 and finally transmit mechanical force. The deflection angle of the steel wire rope refers to the bending angle of the steel wire rope when passing through the movable pulley or winding drum 3, and the deflection angle changes with the change of the out rope point of winding drum 3. If the deflection angle is too large, the steel wire rope will bear too large bending stress, resulting in fatigue damage or even breakage.

[0035] In the embodiment, the movable pulley shaft 101 can not only support the rotation of the end movable pulley 102, but also adjust the position of the end movable pulley 102. The telescopic shaft section 1012 of the movable pulley shaft 101 is telescoped by the driving mechanism 104, so that the position of the end movable pulley 102 can be dynamically adjusted according to the change of the rope exit point of the drum 3. By adjusting the position of the end movable pulley 102, the entry angle of the first steel wire rope 41 can be effectively adjusted, and the deflection angle thereof can be kept within a reasonable range. The telescoping of the driving mechanism 104 can adjust the position of the end movable pulley 102 according to the requirements of the system, thereby ensuring the stable operation of the steel wire rope.

[0036] It should be explained that, since the load and the inclination angle of the first steel wire rope 41 around the end movable pulley 102 are usually greater than those of the second steel wire rope 42 around the middle movable pulley 103, the embodiment can reduce the load and the inclination angle of the first steel wire rope 41 around the end movable pulley 102, thereby achieving the purpose of reducing the bending stress of the steel wire rope and improving the stability and durability of the movable pulley device 1.

[0037] In the hoist system, the first steel wire rope 41 is unwound from the drum 3, passes through the end movable pulley 102, and finally drives the lifting of the hoist. With the lifting of the hoist, the rope exit point of the first steel wire rope 41 on the drum 3 will change. The "rope exit point" refers to the position at which the steel wire rope is pulled out of the drum 3, and the "change direction of the rope exit point" refers to the direction in which the position of the rope exit point on the drum 3 changes when the steel wire rope is pulled out or retracted from the drum 3. Specifically, with the lifting of the hoist, the rotation of the drum 3, or the winding and unwinding of the steel wire rope, the position of the rope exit point will move along the axial direction of the drum 3, and this moving direction is the "change direction of the rope exit point".

[0038] For example, the first steel wire rope 41 moves from the initial position to the terminal position of the first steel wire rope 41`, and the deflection angle of the first steel wire rope 41 changes accordingly.

[0039] The "target range" refers to the range of deflection angles of the steel wire rope relative to the predetermined direction (usually the ideal vertical or horizontal direction) when the steel wire rope is wound into or out of the end movable pulley 102 or the drum 3.

[0040] Compared with the prior art, the utility model discloses the beneficial effects are: through with the movable pulley axle 101 is divided into fixed axle section 1011 and retractable axle section 1012, and through the drive mechanism 104 control retractable axle section's elongation and shortening, and then drive movable pulley axle 101 on the end portion movable pulley 102 along the wire rope in the reel 3 out rope point change direction movement, can ensure that the wire rope's cutting angle of inclination is in the target range, avoids the transition bending of wire rope.For example when movable pulley is in the falling state, the wire rope out rope point on the reel 3 moves along the end portion of reel 3 to the center, retractable axle section 1012 shrinks under the control of drive structure at this time, to reduce the change range of the relative position of end portion movable pulley 102 compared with the wire rope out rope point on the reel, to reach the purpose of controlling the deflection angle of wire rope, and then less fatigue damage of wire rope, prolong the service life of movable pulley device 1.The utility model can reduce the deflection angle of wire rope in the working process of movable pulley device 1, improve the safety and service life of movable pulley device 1.

[0041] In an embodiment, the movable pulley device 1 further comprises an intermediate movable pulley 103, which is installed on the fixed axle section 1011 of the movable pulley axle 101, used for guiding the second wire rope 42 to run, and cooperates with the end portion movable pulley 102, and the second wire rope 42 is the wire rope that passes through the intermediate movable pulley 103 and the reel 3.

[0042] It needs to be explained that the main role of the intermediate movable pulley 103 is to change the running path of the wire rope. In a multi-movable pulley system, the wire rope usually needs to pass through the guidance of multiple movable pulleys, and the intermediate movable pulley 103 is used for further adjusting the path of the wire rope; and the second wire rope 42 is the wire rope that passes through the intermediate movable pulley 103, which usually works in parallel with the first wire rope 41, and is responsible for driving other parts of the hoist or as a backup traction line; the second wire rope 42 is guided by the intermediate movable pulley 103, so that its running path is more stable, the deflection angle is reduced, and the friction loss and wear of the wire rope are reduced.

[0043] In this embodiment, the end portion movable pulley 102 and the intermediate movable pulley 103 cooperate in the path of the wire rope, ensuring that the deflection angle of the first wire rope 41 passing through the end portion movable pulley 102 always remains within the target range, thereby avoiding excessive bending and uneven stress of the first wire rope 41. This embodiment can further optimize the path of the wire rope by reasonably arranging the intermediate movable pulley 103 and the second wire rope 42, share the bending stress and load of the first wire rope 41, and ensure the stable running of the first wire rope 41.

[0044] In an embodiment, the intermediate movable pulley 103 is connected to the movable pulley shaft 101 through a first bearing, and the telescopic movement of the telescopic shaft segment 1012 drives the end movable pulley 102 to move axially along the movable pulley shaft 101, so that the distance between the end movable pulley 102 and the intermediate movable pulley 103 changes.

[0045] Specifically, the intermediate movable pulley 103 is connected to the fixed shaft segment 1011 of the movable pulley shaft 101 through a first bearing, so as to ensure the stable operation of the intermediate movable pulley 103 on the movable pulley shaft 101, and the telescopic movement of the telescopic shaft segment 1012 drives the end movable pulley 102 to move axially along the movable pulley shaft 101 through the driving mechanism 104, so as to adjust the distance between the end movable pulley 102 and the intermediate movable pulley 103. By adjusting the distance between the end movable pulley 102 and the intermediate movable pulley 103, the embodiment can dynamically optimize the running path of the first steel wire rope 41. With the change of the out-of-rope point of the first steel wire rope 41 on the winding drum 3, the adjustment of the position of the end movable pulley 102 can ensure that the first steel wire rope 41 always runs at a proper deflection angle, avoid excessive bending or uneven force of the first steel wire rope 41, and reduce the wear and fatigue damage of the first steel wire rope 41.

[0046] In an embodiment, the driving mechanism 104 is a hydraulic driving mechanism, and the telescopic shaft segment 1012 is a telescopic hydraulic cylinder body. The hydraulic driving mechanism includes a hydraulic oil pipe 1041 and a hydraulic oil pump 1041.

[0047] The hydraulic cylinder body is provided with an interface for connecting the hydraulic oil pipe 1041, and the hydraulic cylinder body is in communication with the hydraulic oil pump 1041 through the hydraulic oil pipe 1041.

[0048] It should be explained that in the draw-off sheave system, the movable pulley device 1 is usually also connected with the hydraulic grab beam 2. In the embodiment, the driving mechanism 104 is a hydraulic driving mechanism, and the hydraulic driving mechanism further includes the hydraulic oil pipe 1041 and the hydraulic oil pump 1041, so that the movable pulley device 1 in the embodiment can share the hydraulic oil pump 1041 with the hydraulic grab beam 2 as the driving mechanism 104, thereby avoiding the need to increase an additional driving mechanism 104 to realize the telescopic movement of the telescopic shaft segment 1012 in the movable pulley shaft 101, and effectively saving the cost of constructing the driving mechanism 104.

[0049] In an embodiment, the movable pulley shaft 101 is composed of a first movable pulley shaft unit 101a and a second movable pulley shaft unit 101b which are fixedly connected through a shaft coupling 108, and the first movable pulley shaft unit 101a and the second movable pulley shaft unit 101b are arranged in a central symmetry along the movable pulley shaft 101, and the axis of the first movable pulley shaft unit 101a coincides with the axis of the second movable pulley shaft unit 101b.

[0050] The first movable pulley shaft unit 101a and the second movable pulley shaft unit 101b each include a fixed shaft segment 1011 and a telescopic shaft segment 1012 connected with each other, and the number of the end movable pulleys 102 is two, one of which is arranged on the first movable pulley shaft unit 101a, and the other is arranged on the second movable pulley shaft unit 101b, and the telescopic shaft segment 1012 is located between the two end movable pulleys 102.

[0051] The movable pulley shaft 101 in the embodiment includes a first movable pulley shaft unit 101a and a second movable pulley shaft unit 101b which are symmetrically centered, and the first movable pulley shaft unit 101a and the second movable pulley shaft unit 101b are the same in structure, each including a fixed shaft segment 1011 and a telescopic shaft segment 1012, and the number of the end movable pulleys 102 is two, one of which is arranged on the first movable pulley shaft unit 101a, and the other is arranged on the second movable pulley shaft unit 101b, and the telescopic shaft segment 1012 is located between the two end movable pulleys 102, so that the movable pulley shaft 101 can balance the axial load, ensure that the movable pulley shaft 101 is uniformly stressed during the telescopic process, avoid partial load and deformation, and further improve the overall stability and durability of the movable pulley device 1.

[0052] Referring to Figure 3 In an embodiment, the fixed shaft segment 1011 of the first movable pulley shaft unit 101a and the second movable pulley shaft unit 101b each includes an end movable pulley fixed shaft segment 10111, an intermediate movable pulley fixed shaft segment 10112 and a shaft coupling fixed shaft segment 10113 connected in sequence, and the end movable pulley fixed shaft segment 10111, the telescopic shaft segment 1012, the intermediate movable pulley fixed shaft segment 10112 and the shaft coupling fixed shaft segment 10113 are connected in sequence.

[0053] Specifically, the end movable pulley fixed shaft segment 10111 is used to fix the end movable pulley 102 and provide axial support; the intermediate movable pulley fixed shaft segment 10112 is used to fix the intermediate movable pulley 103 and ensure its stable operation; the shaft coupling fixed shaft segment 10113 is used to connect the first movable pulley shaft unit 101a and the second movable pulley shaft unit 101b, ensuring the overall connection and stability of the movable pulley shaft 101, and the telescopic shaft segment 1012 can realize telescopic adjustment under the control of the driving mechanism 104, adjusting the axial position of the movable pulley device 1. The design of the movable pulley shaft 101 in the embodiment can effectively disperse the axial load and enhance the stability of the movable pulley device 1.

[0054] In an embodiment, the end movable pulley 102 is fixed on the end movable pulley fixed shaft section 10111 through a second bearing, and the middle movable pulley 103 is fixed on the middle movable pulley fixed shaft section 10112.

[0055] In the embodiment, the end movable pulley 102 is fixed on the end movable pulley fixed shaft section 10111 through a second bearing to ensure the stability and accurate movement of the end movable pulley 102 in the axial direction; meanwhile, the middle movable pulley 103 is fixed on the middle movable pulley fixed shaft section 10112, and is fixedly connected with the end movable pulley fixed shaft section 10111, so that the middle movable pulley 103 can keep a stable position during the movement of the movable pulley shaft 101, thereby ensuring the smooth running of the steel wire rope.

[0056] In an embodiment, the hydraulic grab beam 2 connected with the middle movable pulley fixed shaft section 10112 is further included, and the hydraulic oil pump 1042 is connected with the hydraulic grab beam 2 and the telescopic shaft section 1012 respectively.

[0057] Specifically, in the embodiment, the middle movable pulley fixed shaft section 10112 is connected with the hydraulic grab beam 2, the flow and pressure of the hydraulic oil can be adjusted by the hydraulic oil pump 1041 to drive the hydraulic grab beam 2 to perform the gate grabbing operation, and the telescopic shaft section 1012 can also be driven to be telescopic.

[0058] In an embodiment, the sliding end shield 105, the fixed end shield 109, the shaft stop plate 106 and the bolt are further included.

[0059] The sliding end shield 105 is fixedly arranged on the end movable pulley fixed shaft section 10111 and is sleeved on the periphery of the end movable pulley 102, the fixed end shield 109 is sleeved on the periphery of the telescopic shaft section 1012, the partial areas of the sliding end shield 105 and the fixed end shield 109 overlap, the end movable pulley fixed shaft section 10111 is provided with a slot, the shaft stop plate 106 is fixed on the end movable pulley fixed shaft section 10111 through the bolt, and the shaft stop plate 106 is located on the side of the sliding end shield 105 close to the end of the movable pulley shaft 101.

[0060] The sliding end shield 105 is fixedly arranged on the end portion movable pulley fixed shaft segment 10111, which can protect the end portion movable pulley fixed shaft segment 10111 and prevent external objects from entering the end portion movable pulley fixed shaft segment 10111; the sliding end shield 105 is sleeved on the periphery of the end portion movable pulley 102, the fixed end shield 109 is sleeved on the periphery of the telescopic shaft segment 1012, and the sliding end shield 105 and the fixed end shield 109 overlap in some areas, so that, during the telescoping of the telescopic shaft segment 1012, the sliding end shield 105 and the fixed end shield 109 change the overlapping area to keep the end portion movable pulley fixed shaft segment 10111 and the telescopic shaft segment 1012 always within the sleeving range of the sliding end shield 105 and the fixed end shield 109, so as to avoid external objects falling on the end portion movable pulley fixed shaft segment 10111 and the telescopic shaft segment 1012; the shaft 101 of the end portion movable pulley 102 is provided with a slot, so as to facilitate the installation of the shaft stop plate 106. The shaft stop plate 106 is fixed on the end portion movable pulley fixed shaft segment 10111 by bolts and is located on the side of the sliding end shield 105 close to the end portion of the movable pulley shaft 101, which can prevent the shaft 101 of the end portion movable pulley 102 from being excessively displaced or damaged during use.

[0061] In an embodiment, the hanging plate 107 and the intermediate shield 110 are further included;

[0062] The shaft hole is arranged on the intermediate movable pulley fixed shaft segment 10112, one end of the hanging plate 107 passes through the shaft hole, the other end of the hanging plate 107 is provided with a shaft moving device for adjusting the axial position of the telescopic shaft segment 1012, the intermediate movable pulley 103 is arranged on the intermediate movable pulley fixed shaft segment 10112, the intermediate shield 110 is sleeved on the periphery of the intermediate movable pulley 103, and the intermediate shield 110 and the fixed end shield 109 are fixed on the end of the hanging plate 107 passing through the shaft hole.

[0063] In the embodiment, one end of the hanging plate 107 is fixed with the intermediate shield 110 and the fixed end shield 109, the intermediate shield 110 is located on the side of the hanging plate 107 close to the middle portion of the movable pulley shaft 101, and the fixed end shield 109 is located on the other side of the hanging plate 107, so as to protect and fix the end portion movable pulley 102 and the intermediate movable pulley 103; the intermediate shield 110 is used for protecting the intermediate movable pulley 103; the other end of the hanging plate 107 is provided with a shaft moving device, the shaft moving device is used for adjusting the axial position of the telescopic shaft segment 1012, so as to realize the accurate control of the position of the end portion movable pulley 102 during work, and thus the loss of the first steel wire rope 41 is reduced. The embodiment can effectively improve the stability and adjustability of the movable pulley device 1, and can prolong the service life of the movable pulley device 1 by protecting the key components through the shield.

[0064] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A movable pulley device, characterized in that, It includes a movable pulley shaft (101), at least one end movable pulley (102), and a drive mechanism (104). The movable pulley shaft (101) includes a fixed shaft section (1011) and a telescopic shaft section (1012) connected to each other. The telescopic shaft section (1012) is connected to the drive mechanism (104). At least one of the end movable pulleys (102) is fixed to the end of the movable pulley shaft (101), and the drive mechanism (104) drives the telescopic shaft section (1012) to extend or shorten axially, so as to drive the end movable pulley (102) to move along the direction of the change of the rope exit point of the first wire rope (41) on the drum (3). The first wire rope (41) is a wire rope that passes through the end movable pulley (102) and the drum (3).

2. The movable pulley device according to claim 1, characterized in that, It also includes an intermediate movable pulley (103), which is installed on the fixed shaft section (1011) of the movable pulley shaft (101) and is used to guide the second wire rope (42) to run. The second wire rope (42) is a wire rope that passes through the intermediate movable pulley (103) and the drum (3).

3. The movable pulley device according to claim 2, characterized in that, The intermediate movable pulley (103) is connected to the movable pulley shaft (101) through the first bearing, and the extension and retraction of the telescopic shaft section (1012) drives the end movable pulley (102) to move axially along the movable pulley shaft (101).

4. The movable pulley device according to claim 3, characterized in that, The drive mechanism (104) is a hydraulic drive mechanism, the telescopic shaft section (1012) is a telescopic hydraulic cylinder, and the hydraulic drive mechanism includes a hydraulic oil pipe (1041) and a hydraulic oil pump (1042). The hydraulic cylinder is connected to the hydraulic pump (1042) via the hydraulic oil pipe (1041).

5. The movable pulley device according to claim 4, characterized in that, The movable pulley shaft (101) is composed of a first movable pulley shaft unit (101a) and a second movable pulley shaft unit (101b) fixedly connected by a coupling (108). The first movable pulley shaft unit (101a) and the second movable pulley shaft unit (101b) are symmetrically arranged around the center of the movable pulley shaft (101), and the axis of the first movable pulley shaft unit (101a) and the axis of the second movable pulley shaft unit (101b) coincide. The first movable pulley shaft unit (101a) and the second movable pulley shaft unit (101b) each include a fixed shaft section (1011) and a telescopic shaft section (1012) connected to each other. The number of end movable pulleys (102) is two, one of which is arranged on the first movable pulley shaft unit (101a) and the other is arranged on the second movable pulley shaft unit (101b). The telescopic shaft section (1012) is located between the two end movable pulleys (102).

6. The movable pulley device according to claim 5, characterized in that, The fixed shaft section (1011) of both the first movable pulley shaft unit (101a) and the second movable pulley shaft unit (101b) includes an end movable pulley fixed shaft section (10111), an intermediate movable pulley fixed shaft section (10112), and a coupling fixed shaft section (10113), which are connected in sequence.

7. The movable pulley device according to claim 6, characterized in that, The end movable pulley (102) is fixed on the end movable pulley fixed shaft section (10111) by a second bearing, and the intermediate movable pulley (103) is fixed on the intermediate movable pulley fixed shaft section (10112).

8. The movable pulley device according to claim 6, characterized in that, It also includes a hydraulic gripping beam (2) connected to the fixed shaft section (10112) of the intermediate movable pulley, and the hydraulic oil pump (1042) is connected to the hydraulic gripping beam (2) and the telescopic shaft section (1012) respectively.

9. The movable pulley device according to claim 6, characterized in that, It also includes a sliding end cover (105), a fixed end cover (109), a shaft stop plate (106), and bolts; The sliding end cover (105) is fixedly mounted on the fixed shaft section (10111) of the end movable pulley and sleeved around the end movable pulley (102). The fixed end cover (109) is sleeved around the telescopic shaft section (1012). Parts of the sliding end cover (105) and the fixed end cover (109) overlap. The fixed shaft section (10111) of the end movable pulley is provided with a slot. The stop plate (106) is fixed on the fixed shaft section (10111) of the end movable pulley by the bolt. The stop plate (106) is located on the side of the sliding end cover (105) near the end of the movable pulley shaft (101).

10. The movable pulley device according to claim 9, characterized in that, It also includes a hanging platform (107) and an intermediate protective cover (110); The intermediate movable pulley fixed shaft section (10112) has a shaft hole, one end of the hanging plate (107) passes through the shaft hole, and the other end of the hanging plate (107) is equipped with a shaft shifting device for adjusting the axial position of the telescopic shaft section (1012). An intermediate movable pulley (103) is provided on the intermediate movable pulley fixed shaft section (10112), and an intermediate protective cover (110) is sleeved on the periphery of the intermediate movable pulley (103). The intermediate protective cover (110) and the fixed end protective cover (109) are fixed to one end of the hanging plate (107) that passes through the shaft hole.

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