A variable diameter traction wheel for rope rail type lifting equipment

Abstract

A variable diameter traction wheel for rope-rail type lifting equipment includes a wheel arc block, a connecting rod mechanism, a wheel hub, a shaft sleeve and a limit pin. The wheel hub is mounted on the shaft sleeve via a limit pin, and a plurality of connecting rod mechanisms are rotatably provided on the outer periphery of the wheel hub. A wheel arc block is rotatably provided on each connecting rod mechanism. A rope groove is provided on the outer side of the wheel arc block. Two groove structures are provided at the inner diameter position of the wheel arc block, and the groove structures are hinged to one end of the corresponding connecting rod mechanism, and the other end of the connecting rod mechanism is hinged to the outer periphery of the wheel hub. The wheel hub includes an outer wheel hub and an inner wheel hub, the inner wheel hub is fixed to the inner end of the shaft sleeve, and the outer wheel hub is slidably provided to the outer end of the shaft sleeve. The present invention has higher load capacity and efficiency; can better adapt to operation in different environments; the required axial space is reduced, and it is particularly suitable for occasions with strict requirements on volume or space; it is easy to maintain a stable posture in the air, reduces the requirements for the guide and clamping mechanism, and reduces the adjustment operation time of the entire equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of special lifting equipment, and in particular relates to a diameter-variable traction wheel for rope-rail type lifting equipment. Background Art

[0002] Rope-track lifting equipment (also known as rope climbing / wire robot, climbing robot, rope climbing hoist, etc. in the existing technology) is a special lifting equipment, mainly used for the transportation of personnel and materials in narrow, deep and outdoor environments, such as rescue climbing and escape from urban high-rise fires, mine rescue, field exploration and rescue, etc., which can reduce the corresponding manpower and time consumption.

[0003] Special application scenarios require that the rope-track hoisting equipment be as small and light as possible while meeting a certain load capacity. To improve the operating efficiency of the rope-track hoisting equipment under different loads, it needs to have a mechanical speed change function. Using a traditional gearbox would significantly increase the overall weight and volume, which does not meet the requirements. Based on the speed change principle of changing the contact radius with the rope, the present invention designs an active traction wheel with a variable contact radius, which can serve as the actuator of the rope-track hoisting equipment. The existing related technologies are analyzed as follows:

[0004] ① The actuators of most existing rope-rail hoisting equipment are friction wheels with fixed diameters, which have the disadvantages of low load capacity, low lifting efficiency, and a single transmission ratio, affecting the overall performance of the rope-rail hoisting equipment;

[0005] ② The existing mechanisms and technologies that use the variable contact radius speed change principle are mainly concentrated in the fields of belt drive and chain drive. The transmission medium is a V-belt or a special transmission chain, and there are problems such as overly complex structure and large axial space.

[0006] The most relevant invention patent is a previous invention of mine: a variable-diameter friction wheel for rope transmission in climbing devices (Patent No.: CN109386586A). This relates to a variable-diameter friction wheel that can be used as an actuator for rope-track hoisting equipment. Its structural composition and variable-diameter effect: it consists of a fixed friction disc, a dynamic friction disc, and a stop nut. The dynamic friction disc slides along the grooves in the fixed friction disc, changing the axial distance between the two friction discs, thereby changing the depth of the rope groove formed by the working surfaces of the two friction discs, ultimately achieving the effect of varying the contact radius with the rope. However, this mechanism has the following main shortcomings:

[0007] ① The contact surface between the variable diameter friction wheel and the rope has no surface texture, and during operation, only one side of the friction wheel contacts the rope. The load capacity per unit arc is limited, and the rope needs to be wound multiple times to provide a certain load capacity, which increases the volume of the mechanism.

[0008] ② The friction transmission lifting mechanism will inevitably cause the rope to elastically slide relative to the friction wheel, resulting in low efficiency;

[0009] ③ When the variable-diameter friction wheel changes diameter, its contact center with the rope will undergo axial displacement relative to the mounting reference surface. To ensure operational reliability, the rope clamping mechanism also needs to be adjusted accordingly. This manual adjustment is cumbersome and lacks high precision. Summary of the Invention

[0010] In response to the problems existing in the above-mentioned prior art, the present invention aims to provide a variable diameter traction wheel for rope-rail type lifting equipment. The wheel traction device provided by the present invention has strong load capacity, high efficiency, small size and variable diameter.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] A variable diameter traction wheel for rope-rail type lifting equipment comprises a wheel arc block, a connecting rod mechanism, a wheel hub, a shaft sleeve and a limit pin.

[0013] The wheel hub is mounted on the shaft sleeve via a stop pin. Several sets of connecting rod mechanisms are rotatably mounted on the outer periphery of the wheel hub. Each set of connecting rod mechanisms is rotatably mounted on a wheel arc block. The number of connecting rod mechanisms is twice the number of wheel arc blocks. The wheel arc blocks can be assembled to form a closed circular ring.

[0014] The outer side of the wheel arc block is provided with a rope groove. The inner diameter position of the wheel arc block is provided with two groove structures, the groove structure of the inner diameter of the wheel arc block is hinged to one end of the corresponding connecting rod mechanism, and the other end of the connecting rod mechanism is hinged to the outer periphery of the wheel hub.

[0015] The wheel hub includes an outer wheel hub and an inner wheel hub. The inner wheel hub is fixedly arranged on the inner end of the shaft sleeve, and the outer wheel hub is slidably arranged on the outer end of the shaft sleeve. The limit pin can be used to adjust the position of the outer wheel hub and position it.

[0016] Furthermore, the connecting rod mechanism is composed of a special-shaped screw and a connecting rod, and the special-shaped screw is arranged at both ends of the connecting rod.

[0017] Furthermore, the connecting rod has a bowl-shaped configuration at both ends, with a circular hole at the center of the bottom of the bowl and a closed-end sliding groove. One end of the special-shaped screw is hemispherical, and the other end is a stud. A threaded hole is provided within the groove structure on the inner diameter of the wheel arc block. One bowl-shaped end of the connecting rod is fastened to the threaded hole in the wheel arc block groove via the stud. The other bowl-shaped end of the connecting rod is hinged to a groove on the outer periphery of the wheel hub via a special-shaped screw. The stud of the special-shaped screw slides within the sliding groove of the bowl-shaped end of the connecting rod.

[0018] Furthermore, the inner diameter of the hub has a toothed structure that forms a clearance fit with the groove of the outer profile of the sleeve and can slide along the groove of the outer profile of the sleeve. The number of the toothed structures is consistent with the number of grooves on the outer surface of the sleeve. The number of the toothed structures is 8-50.

[0019] Furthermore, the outer surface of the sleeve has a groove structure, and the groove structure has a draft feature at one end of the sleeve.

[0020] Furthermore, the shaft sleeve is processed with a hole structure at one end having the draft feature, and the stop pin cooperates with the hole structure at one end of the shaft sleeve.

[0021] Furthermore, the number of the arc blocks is recorded as n, n∈[5,12], and the radian corresponding to a single arc block is 2π / n.

[0022] Furthermore, the outer periphery of the wheel hub has n groove structures, and the groove structures on the outer periphery of the wheel hub are hinged to the ball head at one end of the connecting rod mechanism.

[0023] Furthermore, the connection between the connecting rod mechanism and the wheel arc block and the wheel hub is a ball joint connection, and the connecting rod has three rotational degrees of freedom relative to the wheel arc block and the wheel hub.

[0024] Furthermore, the structure of the connecting rod mechanism and the connection method with the wheel arc block and the wheel hub can be changed from a ball joint to a common hinge method.

[0025] Furthermore, the rope groove surface is evenly arranged with regular ridge structures, the ridge height (ie, the height from the top of the ridge to the rope groove surface) is 2 to 3.5 mm, and the number of ridges in a single wheel arc block is two to nine.

[0026] Furthermore, the chain between the inner hub and the sleeve can be changed according to the specific characteristics of the rope-rail lifting equipment, and can be a fixed connection (directly fixed or jointly fixed to a certain mechanism) or a non-fixed connection.

[0027] Furthermore, the form in which the limit pin is fixed to the shaft sleeve can be changed, and can be a threaded connection, a magnetic connection, an elastic connection, etc.

[0028] The beneficial effects of the present invention are:

[0029] ① Compared with existing friction wheels, the rope groove of the variable diameter traction wheel of the present invention has a ridge-like surface texture, which has higher load capacity and efficiency;

[0030] ② Compared with existing friction wheels, the variable diameter traction wheel of the present invention can change its contact radius with the rope, thereby making the rope-track type lifting equipment using this mechanism have a mechanical speed change function, thereby better adapting to operation in different environments;

[0031] ③ Compared with the existing variable diameter transmission mechanism, the axial space required by the present invention after the diameter is changed is significantly reduced, and it is particularly suitable for occasions with strict requirements on volume or space, such as rope-rail lifting equipment;

[0032] ④ Compared with the existing variable diameter friction wheel used for rope-rail lifting equipment, the variable diameter traction wheel of the present invention will not undergo axial displacement relative to the installation reference surface in the contact center surface with the rope after the diameter is changed, so it is easier to maintain the stability of the aerial posture. At the same time, it reduces the requirements for the guide and clamping mechanism and reduces the adjustment operation time of the entire equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 Schematic diagram of the connecting rod mechanism structure;

[0035] Figure 3 Schematic diagram of the sleeve structure;

[0036] Figure 4 This is the diameter changing operation and effect diagram.

[0037] Figure markings: 1- wheel arc block, 2- connecting rod mechanism, 2-1- special-shaped screw, 2-2- connecting rod, 3- wheel hub, 3-1- outer wheel hub, 3-2- inner wheel hub, 4- shaft sleeve, 5- limit pin, a- minimum diameter state, b- adjustment state, c- intermediate diameter state, d- maximum diameter state. DETAILED DESCRIPTION

[0038] For ease of understanding, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and through embodiments:

[0039] like Figure 1-Figure 4 As shown, a variable diameter traction wheel for rope-track type lifting equipment includes a wheel arc block 1, a connecting rod mechanism 2, a wheel hub 3, a shaft sleeve 4 and a limit pin 5.

[0040] The wheel hub 3 is mounted on the shaft sleeve 4 via a stop pin 5. Several sets of linkage mechanisms 2 are rotatably mounted on the outer periphery of the wheel hub 3. Each linkage mechanism 2 comprises two linkage mechanisms 2, and each linkage mechanism 2 is rotatably mounted with a wheel arc block 1. The number of linkage mechanisms 2 is twice the number of wheel arc blocks 1. The wheel arc blocks 1 can be assembled to form a closed circular ring.

[0041] The number of the wheel arc blocks 1 is n; the arc corresponding to a single wheel arc block 1 is 2π / n, and n wheel arc blocks 1 can be assembled into a closed circular ring.

[0042] The outer side of the wheel arc block 1 has a rope groove, and the surface of the rope groove is evenly arranged with regular ridge structures. The ridge height (i.e. the height from the top of the ridge to the rope groove surface) is 2 to 3.5 mm, and the number of ridges in a single wheel arc block is 2 to 9.

[0043] There are two groove structures at the inner diameter position of the wheel arc block 1. The groove structure is hinged to the ball head at one end of the connecting rod mechanism 2 and provides the space required for the rotation and storage of the connecting rod mechanism 2 without causing motion interference.

[0044] The number of the connecting rod mechanism 2 is twice that of the wheel arc blocks 1, and the connecting rod mechanism 2 is composed of a special-shaped screw 2-1 and a connecting rod 2-2.

[0045] Both ends of the connecting rod 2-2 have a bowl-shaped shape, a round hole is opened in the center of the bottom of the bowl, and a sliding groove with a closed end is provided.

[0046] One end of the special-shaped screw 2-1 is hemispherical, and the other end is a stud. The stud is fastened to the threaded hole in the groove of the wheel arc block 1. The hemispherical head of the special-shaped screw 2-1 and the groove of the wheel arc block 1 together form a layered space, which is the active area of ​​the bowl-shaped end of the connecting rod 2-2.

[0047] The stud of the special-shaped screw 2-1 can slide in the slide groove of the bowl-shaped end of the connecting rod 2-2, thereby ensuring that the connecting rod 2-2 has three rotational degrees of freedom.

[0048] The other bowl-shaped end of the connecting rod 2-2 is hinged in a groove on the outer periphery of the hub 3 through a special-shaped screw 2-1, and the situation is similar to the above.

[0049] The outer surface of the sleeve 4 has a groove structure, the number of which is m. The groove structure has a draft feature at one end of the sleeve 4. The draft feature makes it easier to reinsert the hub 3 into the groove after rotating it a certain angle. The sleeve 4 has a hole structure machined on the end with the draft feature.

[0050] The inner diameter of the hub 3 has a toothing structure, which forms a clearance fit with the groove of the outer contour of the sleeve 4 and can slide along the groove of the outer contour of the sleeve 4; the number of toothings is recorded as m. The larger the m value, the finer the contact radius adjustment of this mechanism, but the lower the strength and the more complicated the processing. m∈[8,50], in this example, m=24.

[0051] The outer periphery of the wheel hub 3 has n groove structures, which are hinged to the ball head at one end of the connecting rod mechanism 2 and provide space required for the rotation and storage of the connecting rod mechanism without causing motion interference.

[0052] The wheel hub 3 includes an outer wheel hub 3-1 and an inner wheel hub 3-2. The inner wheel hub 3-2 is fixedly arranged on the shaft sleeve 4, and the outer wheel hub 3-1 is slidably arranged on the shaft sleeve 4. The position and positioning of the outer wheel hub 3-1 can be adjusted by the limit pin 5.

[0053] The connecting rod mechanism 2 is connected to the wheel arc block 1 and the wheel hub 3 by a ball joint connection, and the connecting rod 2-2 has three rotational degrees of freedom relative to the wheel arc block 1 and the wheel hub 3.

[0054] The limiting pin 5 cooperates with the hole structure at one end of the shaft sleeve 4 to limit the sliding of the wheel hub 3 on the shaft sleeve 4 and fix its position.

[0055] The structure of the connecting rod mechanism 2 and its connection method with the wheel arc block 1 and the wheel hub 3 can be changed from a ball joint to an ordinary hinge method. In this case, the rotational freedom of the connecting rod 2-2 relative to the wheel arc block 1 and the wheel hub 3 is reduced to one. During the diameter changing operation, the inner wheel hub slides with the outer wheel hub, but when the outer wheel hub is rotated, the inner wheel hub remains stationary.

[0056] The chain between the inner hub 3-2 and the sleeve 4 can also be changed according to the specific characteristics of the rope-track lifting equipment. It can be a fixed connection (directly fixed or jointly fixed to a certain mechanism) or a non-fixed connection.

[0057] The limiting pin 5 can be fixed on the shaft sleeve 4 by threaded connection, magnetic connection, elastic connection, etc.

[0058] The diameter reduction operation process is as follows:

[0059] Step 1: Pull out the limit pin 5;

[0060] Step 2: Pull out the outer hub 3-1 along the shaft sleeve, while keeping the inner hub 3-2 stationary; rotate the outer hub 3-1 at a certain angle so that the inner hole of the outer hub 3-1 is aligned with the other groove of the shaft sleeve 4, and push the hub into the corresponding position of the shaft sleeve along the groove;

[0061] Step 3: Insert the limiting pin 5 and fix the outer hub 3-1.

[0062] When the outer hub 3-1 rotates relative to the inner hub 3-2 (and also relative to the shaft sleeve) by a certain angle, the position of the wheel arc block 1 from the axis of the shaft sleeve 4 will change, that is, the radius of the circumscribed circle of the contour line of the wheel arc block 1 will change. Figure 4 a, b, c, d, and accordingly, the contact radius between the rope groove and the rope changes.

[0063] It can be used for rope-rail lifting equipment, and after the diameter is changed, the contact center surface with the rope will not undergo axial displacement relative to the installation reference surface, making it easier to maintain a stable posture in the air. At the same time, it reduces the requirements for the guide and clamping mechanism and reduces the adjustment operation time of the entire equipment.

[0064] The above embodiments are merely illustrative or illustrative of the technical solutions of the present invention and should not be construed as limiting the technical solutions of the present invention. It is apparent that those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Provided such modifications and variations fall within the scope of the claims and their equivalents, the present invention also encompasses such modifications and variations.

Claims

1. A variable diameter traction sheave for a rope-rail type lifting device, comprising a wheel arc block, a connecting rod mechanism, a wheel hub, a shaft sleeve, and a limit pin; The wheel hub is mounted on the shaft sleeve via a limit pin, and a plurality of connecting rod mechanisms are rotatably mounted on the outer periphery of the wheel hub, and a wheel arc block is rotatably mounted on each connecting rod mechanism; The outer side of the wheel arc block is provided with a rope groove, and the inner diameter position of the wheel arc block is provided with two groove structures. The groove structure on the inner diameter of the wheel arc block is hinged to one end of the corresponding connecting rod mechanism, and the other end of the connecting rod mechanism is hinged to the outer periphery of the wheel hub; The wheel hub comprises an outer wheel hub and an inner wheel hub, the inner wheel hub is fixedly arranged on the inner end of the shaft sleeve, and the outer wheel hub is slidably arranged on the outer end of the shaft sleeve; the connecting rod mechanism is composed of a special-shaped screw and a connecting rod, and the special-shaped screw is arranged at both ends of the connecting rod; the two ends of the connecting rod have a bowl-shaped appearance, a round hole is opened in the center of the bowl bottom, and a sliding groove with a closed end, one end of the special-shaped screw is hemispherical, and the other end is a stud, which is fastened to the threaded hole in the groove of the wheel arc block, and the hemispherical head of the special-shaped screw and the wheel arc block groove together form a layered space, which The space is the active area of ​​the bowl-shaped end of the connecting rod, and a threaded hole is provided in the groove structure of the inner diameter of the wheel arc block. One bowl-shaped end of the connecting rod is fastened to the threaded hole in the wheel arc block groove by a stud, and the other bowl-shaped end of the connecting rod is hinged to the groove on the outer periphery of the wheel hub by a special-shaped screw. The stud of the special-shaped screw can slide in the sliding groove of the bowl-shaped end of the connecting rod, thereby ensuring that the connecting rod (2-2) has three rotational degrees of freedom; the number of wheel arc blocks is n; the arc corresponding to a single wheel arc block is 2π / n, and n wheel arc blocks 1 can be assembled into a closed circular ring.

2. The variable diameter traction wheel for rope-rail type lifting equipment according to claim 1, characterized in that: The inner diameter of the hub has a toothed structure, which forms a clearance fit with the groove of the outer contour of the sleeve and can slide along the groove of the outer contour of the sleeve. The number of the teeth is consistent with the number of groove structures on the outer surface of the sleeve.

3. The variable diameter traction wheel for rope-rail type lifting equipment according to claim 2, characterized in that: The outer surface of the sleeve has a groove structure, the groove structure has a draft feature at one end of the sleeve, and the sleeve is processed with a hole structure at the end having the draft feature.

4. The variable diameter traction wheel for rope-rail type lifting equipment according to claim 3, characterized in that: The outer periphery of the wheel hub is provided with a plurality of groove structures, and the groove structures on the outer periphery of the wheel hub are hinged to the ball head at one end of the connecting rod mechanism.

5. The variable diameter traction wheel for rope-track type lifting equipment according to claim 4, characterized in that: The connection between the connecting rod mechanism, the wheel arc block and the wheel hub is a ball joint connection.

6. The variable diameter traction wheel for rope-track type lifting equipment according to claim 5, characterized in that: Regular ridge structures are evenly arranged on the surface of the rope groove.

7. The variable diameter traction wheel for rope-track type lifting equipment according to claim 6, characterized in that: The limiting pin may be fixed to the shaft sleeve in the form of a threaded connection, a magnetic connection, or an elastic connection.

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