Working method of lower limit device of wire rope

Abstract

The present invention provides a working method of a lower limit device of a wire rope, and the specific steps include: (1) installing the wire rope end on a fixed rope end fixing device, and presetting the lower limit position of the wire rope on two drums; (2.1.1) winding part of the wire rope on the two drums along the rope groove on the drum, and at the same time, a wire rope is arranged between the pressure roller and the two drums; (2.1.2) driving the two drums to rotate synchronously by the drum driving motor, and the rotation directions of the two drums are opposite; during the descent of the wire rope, the lower limit position of the wire rope can be detected, and at the same time, the pressure roller of the lower limit device is provided with an oblique chamfer, and during the ascent of the wire rope, the wire rope can lift the pressure roller, separate the pressure roller from the drum, and make the wire rope enter between the pressure roller and the drum faster, thereby avoiding the wire rope being stuck on the step of the pressure roller and being unable to lift the pressure roller, thereby simple operation and high safety, and improving the efficiency of the ascent operation.

Description

Technical Field

[0001] The present invention relates to the technical field of crane lifting equipment, and in particular to a rope feeding method of a lower limit device of a steel wire rope. Background Art

[0002] Currently, in the actual crane lifting operation process, the crane lifting equipment is used to lift or lower cargo and is an important mechanism in the crane. The quality of its working performance directly affects the working performance of the entire crane. When the crane lifting equipment reaches the upper or lower limit position, it should automatically cut off the power source and stop movement, thereby realizing the lifting and lowering limit function of the lifting mechanism and preventing damage to the hoisted cargo and the crane itself. For example, Chinese patent application number CN202022547910.5, published on July 20, 2021, discloses a lifting mechanism for a crane, which relates to the technical field of crane lifting mechanisms. It includes a drum wrapped with a wire rope and a wall frame for supporting the drum, and also includes a spring, one end of the spring is fixed to the wall frame, and the other end of the spring is fixed to a pressure roller shaft, one end of the pressure roller shaft is rotatably connected to the pressure roller, and the spring is used to provide initial preload tension to keep the pressure roller pressed on the wire rope of the drum; one end of the connecting rod is connected to the middle of the pressure roller shaft, and the other end of the connecting rod is connected to the connecting rod shaft and the detection rod respectively. The hoisting mechanism's two photoelectric proximity switches are used to detect when the hoisting mechanism's wire rope has reached its upper and lower extremes, respectively. Compared to mechanical limit switches, photoelectric proximity switches offer superior positioning accuracy, operating frequency, service life, ease of installation and adjustment, and adaptability to harsh environments. However, the mechanism presets the lower limit position to the third turn of the first layer. During the descent of the wire rope, the wire rope lifts the pressure roller upward by a distance equal to the diameter of the wire rope, causing the pressure roller to rotate with the connecting rod. Furthermore, the center of the detection rod's head coincides with the center of the first proximity switch during rotation, thereby achieving descent control. Furthermore, the device can only release the rope using a single reel, making it unsafe and inconvenient to operate. Furthermore, the lower limit control is achieved by rotating the connecting rod driven by the pressure roller. Furthermore, the presence of a step on the pressure roller affects the descent of the wire rope after it is released, thereby affecting the equipment's operating efficiency. Summary of the Invention

[0003] The object of the present invention is to provide a working method of a lower limit device of a wire rope, which can detect the lower limit position of the wire rope during the descent of the wire rope, has simple operation and high safety, and improves working efficiency.

[0004] To achieve the above-mentioned purpose, a working method of a lower limit device of a wire rope, the lower limit device of the wire rope is arranged on a drum device, the drum device includes a wall frame, two drums arranged in parallel, a rope end fixing device and two drum driving motors, the lower limit device of the wire rope includes a pressure roller, a spring device and a lower limit travel switch, the lower limit bracket is installed on both sides of the pressure roller, the spring device is arranged on both sides of the pressure roller, one end of the spring device is connected to the lower limit bracket, the other end of the spring device is connected to one end of the pressure roller, the lower limit bracket is respectively connected to the two ends of the pressure roller through the spring device, the lower limit travel switch is arranged on the lower limit bracket on one side of the pressure roller, the spring device is movably arranged between the lower limit travel switch and the two ends of the pressure roller, and the spring device The device includes a spring. When the spring is in a natural state, the pressure roller fits the reel, and the lower limit travel switch works. When the spring is compressed, one end of the travel switch is connected to the spring device, triggering the lower limit travel switch to not work. Both sides of the pressure roller are provided with inclined parts that are inclined upward and inward. The wall frame is provided at both ends of the reel, and the two ends of the reel are respectively connected to the wall frame for rotation. The reel drive motor is provided on the wall frame at one end of the reel, and the output end of the reel drive motor is connected to one end of the reel. A gap is provided between the two reels, and the pressure roller is provided in the gap between the reels, and the two reels are symmetrically arranged relative to the pressure roller, and the pressure rollers are respectively connected to the two reels, the lower limit bracket is fixedly connected to the upper end of the wall frame, and the rope head fixing device is provided at one end of the reel;

[0005] The specific steps include: (1) installing the wire rope end on the fixed rope end fixing device and presetting the lower limit position of the wire rope on the two drums;

[0006] (2.1.1) Wind part of the wire rope onto two drums along the rope groove on the drum, and place the wire rope between the pressure roller and the two drums;

[0007] (2.1.2) The two reels are driven by the reel drive motor to rotate synchronously, and the two reels rotate in opposite directions;

[0008] (2.1.2.1) When one drum rotates in one direction and the other drum rotates in the other direction, the wire rope on the two drums gradually winds around the two drums along the rope grooves on the drums, thus achieving the winding of the wire rope;

[0009] (2.1.2.2) When one drum rotates in one direction opposite to the other, and the other drum rotates in another direction opposite to the other, the wire ropes on the two drums gradually detach from the two drums along the rope grooves on the drums, thereby lowering the wire ropes. When the wire ropes on the two drums reach the preset lower limit position, the pressure roller is connected to the surface of the two drums, so that the pressure roller presses down and drives the spring device to move downward, so that the lower limit travel switch works, and the wire rope is controlled to stop the rope release action.

[0010] The above arrangement, by arranging two drums in parallel, so that the two steel ropes are wound on the two drums respectively, and then the objects are lifted by the two steel ropes, thereby preventing the problem of poor safety caused by the breakage of one steel rope, and the lower limit operation of the two drums can be realized through a steel rope lower limit device, so that the two steel ropes are used for objects with high safety, which has high safety, improves working efficiency and saves resources. In addition, the two drums are pressed together by a pressure roller. During the rope releasing process, the steel rope is wound on the drum through the rope end fixing device. Then, when the two drums reach the lower limit position, the pressure roller contacts the drum, so that the spring returns to its natural state, so that the lower limit stroke switch works and the rope releasing action is no longer performed. The rope releasing action control can be realized only by a lower limit device, which is easy to operate, simple in structure and saves resources. In addition, since each drum is driven by the corresponding drum driving motor, it can realize the operation of a single drum and the operation of two drums, which is simple in structure and saves costs.

[0011] Furthermore, the preset lower limit position of the wire rope on the two drums in step (1) includes: when the wire rope is not wound onto the drum, a pressure roller is in close contact with the surfaces of the two drums, and the wire rope is set to have reached the lower limit position; and when the wire rope is wound onto the drum, a pressure roller is in close contact with the surfaces of the two drums and the wire rope is wound onto the two drums for n turns, and the wire rope is set to have reached the lower limit position.

[0012] The above setting is to set the lower limit position as long as the pressure roller is in close contact with the two drums when the wire rope is not wound around the drum and when it is wound around the drum. Therefore, when the wire rope is wound around the drum, the pressure roller is separated from the drum surface, and the travel switch transmits a signal to the control system, identifying that the wire rope has not reached the lower limit position, and the drum can continue to operate the lowering action.

[0013] Furthermore, there are more than two wall frames, including wall frame one and wall frame two, and wall frame one and wall frame two are respectively arranged at the two ends of the drum, and wall frame one and wall frame two are arranged in parallel. The drum drive motor is arranged and installed on wall frame two away from one end of the rope head fixing device, and a reduction gear mounting plate is provided on wall frame two.

[0014] The above arrangement, by arranging the motor on the second wall frame, can make the reel rotate by driving the reel drive motor; by arranging a reduction gear mounting plate on the second wall frame, can install the reduction gear mounting plate on the reduction gear mounting plate, thereby slowing down the rotation of the reel.

[0015] Furthermore, there are more than two lower limit brackets, including bracket one and bracket two, and the bracket one and bracket two are respectively arranged on both sides of the pressure roller, and the bracket one is arranged parallel to the bracket two, and the bracket one and bracket two are fixed on the steel plate by bolts.

[0016] The above arrangement, by installing the lower limit bracket on both sides of the pressure roller, can be used to install the connecting spring device and the travel switch.

[0017] Furthermore, the pressure roller includes a pressure roller body and a pressure roller skin, bearings are provided at both ends of the pressure roller body, and a rotating shaft passes through the interior of the pressure roller body through the bearings, and both ends of the rotating shaft are respectively connected to one end of the spring device, and the pressure roller skin is fixed to the surface of the pressure roller body by screws, and the pressure roller skin includes a pressure roller skin main body, and the inclined parts are provided on both sides of the pressure roller skin main body, the cross-section of the pressure roller skin is circular, the cross-section of the pressure roller body is circular, one end of the inclined part is connected to the surface of the pressure roller body, and the other end of the inclined part is connected to the surface of the pressure roller skin, and the cross-sectional radius of the pressure roller skin main body is larger than the radius of the cross-sectional radius of the pressure roller body.

[0018] The above arrangement is to provide bearings at both ends of the pressure roller body so that the rotating shaft passes through the interior of the pressure roller body through the bearings, thereby realizing the rotation of the pressure roller; the rotating shaft is connected to one end of the spring device, so that the pressure roller can be pressed tightly against the surface of the reel when the wire rope is not wound around the reel, and inclined parts are respectively provided at both ends of the pressure roller skin. During the rising process of the wire rope, it is convenient for the wire rope to enter the bottom of the pressure roller from both ends of the pressure roller and lift the pressure roller, so that the pressure roller and the reel are separated, thereby avoiding the wire rope being stuck on the step of the pressure roller and being unable to lift the pressure roller, thereby improving working efficiency.

[0019] Furthermore, there are more than two spring devices, and they are arranged parallel to both sides of the pressure roller, and the spring device includes a guide seat, a spacer sleeve, a strut, a spring and a strut seat, the guide seat is fixed to the lower limit bracket by bolts, and a through hole is provided on the guide seat at one end away from the lower limit bracket, the spacer sleeve is provided at both ends of the through hole on the guide seat, the strut passes through the through hole on the guide seat, one end of the strut is fixedly connected to the strut seat, and the other end of the strut is fixedly connected to one end of the lower limit travel switch through a steel plate, the spring is sleeved on the end of the strut connected to the pressure roller bearing end, one end of the spring is connected to the guide seat, and the other end of the spring is connected to the strut seat; one end of the lower limit travel switch is connected to the strut of the spring device through a steel plate, and the other end of the lower limit travel switch is fixed to the lower limit bracket by bolts.

[0020] The above arrangement, by arranging a support rod connected to the support rod seat, and arranging a spring sleeve on one end of the support rod connected to the support rod seat, can reset the pressure roller when the reel is not wound with the wire rope, so that the pressure roller is pressed tightly against the surface of the reel, and it is recognized that the wire rope has reached the lower limit position;

[0021] By setting a lower limit travel switch connected to the support rod of the spring device, the signal that the wire rope has reached the lower limit position can be transmitted to the control system, thereby preventing the reel from lowering.

[0022] Furthermore, the strut seat includes a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are vertically arranged, a strut mounting hole is provided on the first fixed plate at a position corresponding to the strut, one end of the strut is fixedly installed in the strut mounting hole, and a limiting bolt is provided at the other end of the strut, a rotating shaft mounting hole is provided on the second fixed plate, and a limiting column is provided on one side of the rotating shaft mounting hole.

[0023] The above arrangement fixes one end of the support rod on the support rod seat, and then fixes one end of the rotating shaft to the support rod seat through a limit column, so that the rotating shaft will not rotate, and a bearing is provided between the rotating shaft and the pressure roller, so that the pressure roller can rotate, thereby reducing the friction between the reel and the pressure roller. In addition, when the pressure roller is lifted, the support rod seat is lifted and then the support rod moves upward to contact the travel switch. The limit bolt on the other end of the support rod prevents the support rod from disengaging from the guide seat when it moves downward, and the structure has good stability.

[0024] Furthermore, the rope end fixing device includes a fixing piece, the fixing piece is provided with a rope groove matching the steel wire rope, and a countersunk hole matching the rope end of the steel wire rope, the rope groove is provided at the top of the fixing piece, the countersunk hole is provided inside the fixing piece, one end of the rope groove is connected to the countersunk hole and one side surface of the fixing piece, the other end of the rope groove is connected to the other side surface of the fixing piece, and the bottom of the fixing piece is provided with a connecting surface;

[0025] Step (1) installing and fixing the wire rope end. The wire rope end fixing device specifically includes placing the wire rope in the rope groove through the opening of the rope groove, then sliding the wire rope into the rope end fixing device along the rope groove, and then embedding the wire rope end forward and inward into the countersunk hole inside the rope end fixing device to clamp it, thereby quickly installing and fixing the wire rope end.

[0026] The above arrangement, by providing a rope groove matching the rope on the top of the fixing piece, and providing a countersunk hole matching the rope head inside the fixing piece, and one end of the rope groove is connected to the countersunk hole, and the other end of the rope groove is connected to the side, so that when the rope is installed, the rope of the wire rope can slide into the fixing piece through the rope groove on the top of the fixing piece, and then the rope head of the wire rope is embedded forward in the countersunk hole inside the fixing piece, thereby realizing rapid installation and fixation of the wire rope head; when the rope is disassembled, it is only necessary to withdraw the rope head from the countersunk hole inside the fixing piece, and then take out the rope through the rope groove on the top of the fixing piece to complete the rope disassembly, thereby realizing rapid installation and disassembly of the rope and improving work efficiency.

[0027] Furthermore, the side surfaces on both sides of the top surface of the fixing member are cambered surfaces, a protrusion is provided on one side of the fixing member, the countersunk hole is provided inside the fixing member near the protrusion, a tapered hole is provided at the end of the countersunk hole near one end of the protrusion, the aperture of the tapered hole is larger than the aperture of the countersunk hole, an inclined portion is provided on the other side of the fixing member near the countersunk hole corresponding to the protrusion, the inclined portion is arranged outward and upward relative to the axial symmetry line of the countersunk hole, a first inclined portion is also provided on the protrusion, the first inclined portion is arranged outward and upward relative to the axial symmetry line of the countersunk hole; the cross section of the countersunk hole is set to The invention relates to an arc-shaped structure, wherein one end of the countersunk hole is connected to the end of the fixing member close to the protrusion, and the other end of the countersunk hole is connected to one end of the rope groove. The angle between the axisymmetric line of the countersunk hole and the axisymmetric line of the rope groove is 170°-175°. The cross-sectional shape of the rope groove is set to be U-shaped, one side of the rope groove opening is set on the upper end surface of the fixing member, the opening size of the rope groove matches the diameter of the wire rope, and the height of the end of the rope groove connected to the countersunk hole from the bottom of the fixing member is higher than the height of the end of the rope groove away from the countersunk hole from the bottom of the fixing member.

[0028] The above arrangement, by setting the side shapes of both sides of the fixing member to be arc surfaces, facilitates the welding connection between the bottom of the fixing member and the arc-shaped equipment, and also facilitates the winding of the wire rope after it slides out of the rope groove; a protrusion is provided on one side of the fixing member, and when the wire rope is pulled out, the protrusion prevents the wire rope from smoothly entering other equipment for winding; the tapered hole is provided to facilitate further stable fixation of the rope head, and since the fixing member is located at both ends of one side of the fixing hole and is provided with an inclined portion and a first inclined portion, it is convenient for the rope to guide the movement of the rope during the process of entering other rope winding equipment after coming out of the rope groove; the cross section of the countersunk hole is set to an arc, which makes it easy for the rope to be accommodated in the countersunk hole , thereby completing the rope head fixation; by setting the countersunk hole inside the fixing piece and connecting the rope groove on the connecting piece with the countersunk hole, the rope can be easily and quickly installed and removed; the axial symmetry line of the countersunk hole and the axial symmetry line of the rope groove are set to have a small angle, so that after the rope head is set in the countersunk hole, the small angle is used to limit the rope to a certain extent, preventing the rope from being pulled out of the rope groove too quickly; by setting the cross-sectional shape of the rope groove to be U-shaped, and one side of the rope groove opening is connected to the upper end surface of the fixing piece, it is convenient for the wire rope to slide into or out of the rope groove; the end of the rope groove connected to the countersunk hole is higher than the end of the rope groove away from the countersunk hole, which can make the wire rope tighten along the lower end of the rope groove, thereby improving the utilization rate of the wire rope.

[0029] Furthermore, in step (2.1.2.1), one direction is clockwise or counterclockwise, and in step (2.1.2.2), the opposite direction is counterclockwise or clockwise.

[0030] The above setting facilitates operation by setting the two reels to move synchronously in opposite directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a left side view of the present invention.

[0032] Figure 2 It is a partial cross-sectional view of the present invention.

[0033] Figure 3 It is a right side view of the present invention.

[0034] Figure 4 It is a front view of the rope end fixing device of the present invention.

[0035] Figure 5 It is a side view of the rope end fixing device of the present invention.

[0036] Figure 6 It is a top view of the rope end fixing device of the present invention.

[0037] Figure 7 This is a schematic diagram of the connection between the pressure roller and two reels of the present invention.

[0038] Figure 8 This is a schematic diagram of the connection between the lower limit device and the reel of the present invention.

[0039] Figure 9 It is a side view of the lower limit device of the present invention.

[0040] Figure 10 for Figure 8 Enlarged view of point B in the middle.

[0041] Reference numerals: 7, wall frame 1; 9, rope end fixing device; 10, upper limit device; 101, upper limit travel switch; 102, first wire rope; 103, heavy hammer; 11, wall frame 2; 12, reduction gearbox mounting plate; 13, motor mounting foot; 15, lower limit device; 21, left-hand reel; 22, right-hand reel; 27, reel drive motor; 911, fixing member; 912, rope groove; 913, countersunk hole; 914, protrusion; 915, upper end surface; 9131, tapered hole; 9141, first inclined portion ;9142, inclined portion; 151, lower limit bracket 1; 152, pressure roller skin; 153, pressure roller body; 154, rotating shaft; 155, guide seat 156, spacer; 157, support rod; 158, steel plate; 159, lower limit bracket 2; 1510, pad; 1511, lower limit travel switch; 1512, spring; 1513, support rod seat; 1514, inclined surface; 1515, pressure roller body surface; 1516, pressure roller skin surface; 15131, first fixed plate; 15132, second fixed plate. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings and specific implementation plans.

[0043] like Figure 1-10 As shown, an embodiment of the present invention provides a drum device, including a wall frame, two drums arranged in parallel, a rope end fixing device 9, two drum drive motors 27 and a lower limit device 15. There are more than two wall frames. In this embodiment, there are two wall frames, including wall frame 1 7 and wall frame 2 11. Wall frame 1 7 and wall frame 2 11 are respectively arranged at the two ends of the drum, and wall frame 1 7 and wall frame 2 11 are arranged in parallel. The drum drive motor 27 is arranged and installed on wall frame 2 11 away from one end of the rope end fixing device 9, and a reduction gear mounting plate 12 is provided on wall frame 2 11.

[0044] In this embodiment, Figure 1As shown, an upper limit device 10 is provided, and the two ends of the upper limit device 10 are respectively connected to a wall frame 1 7 and a wall frame 2 11. The upper limit device 10 includes an upper limit travel switch 101, a first wire rope 102 and a weight 103. The first wire rope 102 is connected to the upper limit travel switch 101, and when the first wire rope 102 is in a tensioned state, the upper limit travel switch 101 is in an inoperative state. The other end of the first wire rope 102 is connected to the weight 103. The wire rope on the drum passes through the weight 103 and is connected to the hook. When the hook rises to the upper limit device 10, the hook presses against the weight 103, so that the first wire rope 102 connected to the upper limit travel switch 101 is in a relaxed state, so that the upper limit travel switch 101 working control no longer performs the rising work. The control of not performing the rising work when the upper limit travel switch 101 is working is the existing technology and is not repeated here.

[0045] like Figure 4-6 As shown, the lower limit device 15 includes a pressure roller, a spring device and a lower limit travel switch 1511. The lower limit bracket includes a lower limit bracket 1 151 and a lower limit bracket 2 159. The lower limit bracket 1 151 and the lower limit bracket 2 159 are respectively arranged on both sides of the pressure roller, and the lower limit bracket 1 151 is arranged parallel to the lower limit bracket 2 159. One end of the lower limit bracket 1 151 and one end of the lower limit bracket 2 159 are fixed to the steel plate 158 by bolts. The other end of the lower limit bracket 151 and the other end 159 of the lower limit bracket 2 are fixedly mounted on the pad 1510 by bolts. There are more than two spring devices, and they are arranged in parallel on both sides of the pressure roller. The spring device includes a guide seat 155, a spacer 156, a support rod 157, a spring 1512 and a support rod seat 1513. The guide seat 155 is fixed to the lower limit bracket by bolts. A through hole is provided on the end of the guide seat 155 away from the lower limit bracket. The spacer 156 is provided. The support rod 157 is placed at both ends of the through hole on the guide seat 155, and the support rod 157 passes through the through hole on the guide seat 155. One end of the support rod 157 is fixedly connected to the support rod seat 1513, and the other end of the support rod 157 is fixedly connected to one end of the lower limit travel switch 1511 through the steel plate 158. The spring 1512 is sleeved on the end of the support rod 157 connected to the pressure roller bearing end, one end of the spring 1512 is connected to the guide seat 155, and the other end of the spring 1512 is connected to the support rod seat 1513. The rod seat 1513 includes a first fixing plate 15131 and a second fixing plate 15132. The first fixing plate 15131 and the second fixing plate 15132 are arranged vertically. A strut mounting hole is provided on the first fixing plate 15131 at a position corresponding to the strut 157. One end of the strut 157 is fixedly installed in the strut mounting hole. The other end of the strut 157 is provided with a limiting bolt. A rotating shaft mounting hole is provided on the second fixing plate 15132, and a limiting column is provided on one side of the rotating shaft mounting hole.

[0046] like Figure 4As shown, the lower limit travel switch 1511 is set on the lower limit bracket 2 159 on one side of the pressure roller. One end of the lower limit travel switch 1511 is connected to the support rod 157 of the spring device through the steel plate 158, and the other end of the lower limit travel switch 1511 is fixed to the lower limit bracket 2 159 by bolts. The spring device is movably set between the lower limit travel switch 1511 and the two ends of the pressure roller. When the spring is in a natural state, the pressure roller fits the reel and the lower limit travel switch 1511 works. When the spring is compressed, one end of the lower limit travel switch 1511 The lower limit travel switch 1511 connected to the spring device does not work; the pressure roller includes a pressure roller body 153 and a pressure roller skin 152, and bearings are provided at both ends of the pressure roller body 153. The rotating shaft 154 passes through the interior of the pressure roller body 153 through the bearings. The two ends of the rotating shaft 154 are respectively connected to one end of the spring device. The pressure roller skin 152 is fixed to the surface of the pressure roller body 153 by screws. The pressure roller skin 152 includes a pressure roller skin main body, and the second inclined portion is provided on both sides of the pressure roller skin main body. The cross section of the pressure roller skin 152 is circular, and the cross section of the pressure roller body 153 is circular. Figure 6 As shown, one end of the inclined surface 1514 of the second inclined portion is connected to the surface 1515 of the pressure roller body, and the other end of the inclined surface 1514 of the second inclined portion is connected to the surface 1516 of the pressure roller skin. The cross-sectional radius of the pressure roller skin body is larger than the radius of the cross-sectional area of ​​the pressure roller body.

[0047] like Figure 2-3 As shown, in this embodiment, the two drums are respectively a left-handed drum 21 and a right-handed drum 22, and the two ends of the drums are respectively connected to the wall frame 1 7 and the wall frame 2 11 for rotation. The two drum drive motors 27 are respectively arranged on the wall frame 2 11 at one end of the drum, and the output end of the drum drive motor 27 is connected to one end of the drum. A gap is provided between the two drums, and a pressure roller is provided in the gap between the drums. The two drums are symmetrically arranged relative to the pressure roller, and the pressure roller is connected to the two drums respectively. When the left-handed drum 21 rotates counterclockwise, the wire rope on the left-handed drum 21 is lifted. When the right-hand drum 22 rotates clockwise, the wire rope on the right-hand drum 22 performs a lifting action and is wound around the right-hand drum 22 along the rope groove on the right-hand drum 22. When the right-hand drum 22 rotates counterclockwise, the wire rope on the right-hand drum 22 performs a lowering action and is separated from the right-hand drum 22 along the rope groove on the right-hand drum 22.

[0048] like Figure 3 As shown, the lower limit bracket is fixedly connected to the upper end of the wall frame, and the rope end fixing device 9 is set at one end of the reel, as shown in FIG. Figure 7-9As shown, the rope end fixing device 9 includes a fixing member 911, a rope groove 912 matching the wire rope and a countersunk hole 913 matching the rope end of the wire rope are provided on the fixing member 911, the side surfaces on both sides of the top surface of the fixing member 911 are cambered, a protrusion 914 is provided on one side of the fixing member 911, the countersunk hole 913 is provided inside the fixing member 911 near the side of the protrusion 914, and a tapered hole 9131 is provided at the end of the countersunk hole 913 near the end of the protrusion 914. The aperture of 9131 is larger than that of the countersunk hole 913. The fixing member 911 is provided with an inclined portion 9142 on the other side of the fixing member 911 close to the countersunk hole 913 and corresponding to the protrusion 914. The inclined portion 9142 is arranged outwardly and upwardly relative to the axis of symmetry of the countersunk hole 913. The protrusion 914 is also provided with a first inclined portion 9141. The first inclined portion 9141 is arranged outwardly and upwardly relative to the axis of symmetry of the countersunk hole 913. The cross section of the countersunk hole 913 is arranged in an arc shape. One end of the countersunk hole 913 is aligned with the fixing member 911. One end of the fixed member 911 is connected to the side of the protrusion 914, and the other end of the countersunk hole 913 is connected to one end of the rope groove 912. The angle between the axis of symmetry of the countersunk hole 913 and the axis of symmetry of the rope groove 912 is 170°-175°. The rope groove 912 is set at the top of the fixed member 911, and the countersunk hole 913 is set inside the fixed member 911. The cross-sectional shape of the rope groove 912 is set to be U-shaped. The side of the rope groove 912 opening is set at the upper end surface 915 of the fixed member 911. The opening size of 912 matches the diameter of the wire rope. The height of the end of the rope groove 912 connected to the countersunk hole 913 from the bottom of the fixing member 911 is higher than the height of the end of the rope groove 912 away from the countersunk hole 913 from the bottom of the fixing member 911. One end of the rope groove 912 is connected to the countersunk hole 913 and one side of the fixing member 911, and the other end of the rope groove 912 is connected to the other side of the fixing member 911. The bottom of the fixing member 911 is provided with a connecting surface for easy welding connection to the reel.

[0049] In this embodiment, when installing the wire rope end on the rope end fixing device 9, first place the wire rope in the rope groove 912 through the opening of the rope groove 912, then slide the wire rope into the rope end fixing device 9 along the rope groove 912, and then embed the wire rope end forward and inward into the countersunk hole 913 inside the rope end fixing device 9 to be stuck, so that the wire rope end is quickly installed and fixed; when removing the wire rope end from the rope end fixing device 9, withdraw the wire rope end from the countersunk hole 913 inside the rope end fixing device 9, slide the wire rope out along the rope groove 912 at the top of the rope end fixing device 9, and then take out the wire rope through the opening of the rope groove 912, so that the wire rope end is quickly removed.

[0050] In this embodiment, a working method of a lower limit device of a wire rope includes the following specific steps:

[0051] (1) Installing and fixing the wire rope end. The wire rope end fixing device specifically includes placing the wire rope in the rope groove through the opening of the rope groove, then sliding the wire rope along the rope groove into the rope end fixing device, and then inserting the wire rope end forward and inward into the countersunk hole inside the rope end fixing device to clamp it, thereby quickly installing and fixing the wire rope end;

[0052] The lower limit position of the wire rope on the two drums is preset: when the wire rope is not wound onto the drum, it is set that the wire rope has reached the lower limit position when a pressure roller is in close contact with the surfaces of the two drums; and when the wire rope is wound onto the drum, it is set that the wire rope has reached the lower limit position when a pressure roller is in close contact with the surfaces of the two drums and the wire rope has 5 turns left wound onto the two drums.

[0053] (2.1.1) Wind part of the wire rope onto two drums along the rope groove on the drum, and place the wire rope between the pressure roller and the two drums;

[0054] (2.1.2) The two reels are driven by the reel drive motor to rotate synchronously, and the two reels rotate in opposite directions;

[0055] (2.1.2.1) When one drum rotates in one direction and the other drum rotates in the other direction, the wire rope on the two drums gradually winds around the two drums along the rope grooves on the drums, thus achieving the winding of the wire rope;

[0056] (2.1.2.2) When one drum rotates in one direction opposite to the other, and the other drum rotates in another direction opposite to the other, the wire ropes on the two drums gradually detach from the two drums along the rope grooves on the drums, thereby lowering the wire ropes. When the wire ropes on the two drums reach the preset lower limit position, the pressure roller is connected to the surface of the two drums, so that the pressure roller presses down and drives the spring device to move downward, so that the lower limit travel switch works, and the wire rope is controlled to stop the rope release action.

Claims

1. A method for operating a lower limit device for a wire rope, wherein the lower limit device for the wire rope is arranged on a reel device, characterized in that: The cam device includes a wall frame, two parallel drums, a rope end fixing device and two drum driving motors, the wire rope lower limit device includes a pressure roller, a spring device and a lower limit travel switch, the lower limit bracket is installed on both sides of the pressure roller, the spring device is arranged on both sides of the pressure roller, one end of the spring device is connected to the lower limit bracket, the other end of the spring device is connected to one end of the pressure roller, the lower limit bracket is respectively connected to the two ends of the pressure roller through the spring device, the lower limit travel switch is arranged on the lower limit bracket on one side of the pressure roller, the spring device is movably arranged between the lower limit travel switch and the two ends of the pressure roller, the spring device includes a spring, and when the spring is in a natural state, the pressure roller and the drum are in contact with each other. The cam is connected to the spring device and the cam is connected to the spring device, and the cam is triggered to stop the cam. The two sides of the pressure roller are provided with inclined parts that are inclined upward and inward. The wall frame is provided at both ends of the reel, and the two ends of the reel are respectively rotatably connected to the wall frame. The reel drive motor is provided on the wall frame at one end of the reel, and the output end of the reel drive motor is connected to one end of the reel. A gap is provided between the two reels. The pressure roller is provided in the gap between the reels, and the two reels are symmetrically arranged relative to the pressure roller, and the pressure rollers are respectively connected to the two reels. The lower limit bracket is fixedly connected to the upper end of the wall frame, and the rope head fixing device is provided at one end of the reel. The specific steps include: (1) installing the wire rope end on the fixed rope end fixing device and presetting the lower limit position of the wire rope on the two drums; (2.1.1) Wind part of the wire rope onto two drums along the rope groove on the drum, and place the wire rope between the pressure roller and the two drums; (2.1.2) The two reels are driven by the reel drive motor to rotate synchronously, and the two reels rotate in opposite directions; (2.1.2.1) When one drum rotates in one direction and the other drum rotates in the other direction, the wire rope on the two drums gradually winds around the two drums along the rope grooves on the drums, thus achieving the winding of the wire rope; (2.1.2.2) When one drum rotates in one direction opposite to the other, and the other drum rotates in the other direction opposite to the other, the wire ropes on the two drums gradually detach from the two drums along the rope grooves on the drums, thereby lowering the wire ropes. When the wire ropes on the two drums reach the preset lower limit position, the pressure roller is connected to the surface of the two drums, so that the pressure roller presses down and drives the spring device to move downward, thereby activating the lower limit travel switch, controlling the wire rope to stop the rope release action; The preset lower limit position of the wire rope on the two drums in step (1) includes: when the wire rope is not wound onto the drum, a pressure roller is in close contact with the surfaces of the two drums, and the wire rope is set to have reached the lower limit position when the pressure roller is in close contact with the surfaces of the two drums and the wire rope is wound onto the drum for n turns. The rope end fixing device includes a fixing piece, the fixing piece is provided with a rope groove matching the steel wire rope, and a countersunk hole matching the rope end of the steel wire rope, the rope groove is provided at the top of the fixing piece, the countersunk hole is provided inside the fixing piece, one end of the rope groove is connected with the countersunk hole and one side surface of the fixing piece, the other end of the rope groove is connected with the other side surface of the fixing piece, and the bottom of the fixing piece is provided with a connecting surface; Step (1) installing and fixing the wire rope end. The wire rope end fixing device specifically includes placing the wire rope in the rope groove through the opening of the rope groove, then sliding the wire rope into the rope end fixing device along the rope groove, and then embedding the wire rope end forward and inward into the countersunk hole inside the rope end fixing device to clamp it, thereby quickly installing and fixing the wire rope end.

2. The working method of the lower limit device of a steel wire rope according to claim 1, characterized in that: There are more than two wall frames, including wall frame one and wall frame two. Wall frame one and wall frame two are respectively arranged at the two ends of the drum, and wall frame one and wall frame two are arranged in parallel. The drum drive motor is arranged and installed on wall frame two away from one end of the rope head fixing device, and a reduction gear mounting plate is provided on wall frame two.

3. The working method of the lower limit device of a steel wire rope according to claim 1, characterized in that: There are more than two lower limit brackets, including bracket one and bracket two. Bracket one and bracket two are respectively arranged on both sides of the pressure roller, and bracket one is arranged parallel to bracket two. Bracket one and bracket two are fixed on the steel plate by bolts.

4. The method for operating the lower limit device of a steel wire rope according to claim 1, characterized in that: The pressure roller includes a pressure roller body and a pressure roller skin, bearings are provided at both ends of the pressure roller body, and a rotating shaft passes through the interior of the pressure roller body through the bearings, and both ends of the rotating shaft are respectively connected to one end of the spring device, and the pressure roller skin is fixed to the surface of the pressure roller body by screws, and the pressure roller skin includes a pressure roller skin main body, and the inclined parts are provided on both sides of the pressure roller skin main body, the cross-section of the pressure roller skin is circular, and the cross-section of the pressure roller body is circular, one end of the inclined part is connected to the surface of the pressure roller body, and the other end of the inclined part is connected to the surface of the pressure roller skin, and the cross-sectional radius of the pressure roller skin main body is larger than the radius of the cross-sectional radius of the pressure roller body.

5. The working method of the lower limit device of a steel wire rope according to claim 1, characterized in that: There are more than two spring devices, and they are arranged parallel to both sides of the pressure roller. The spring device includes a guide seat, a spacer sleeve, a strut, a spring and a strut seat. The guide seat is fixed to the lower limit bracket by bolts, and a through hole is provided on the guide seat at one end away from the lower limit bracket, and the spacer sleeve is arranged at both ends of the through hole on the guide seat, and the strut passes through the through hole on the guide seat, one end of the strut is fixedly connected to the strut seat, and the other end of the strut is fixedly connected to one end of the lower limit travel switch through a steel plate. The spring is sleeved on the end connected to the strut and the pressure roller bearing end, one end of the spring is connected to the guide seat, and the other end of the spring is connected to the strut seat; one end of the lower limit travel switch is connected to the strut of the spring device through a steel plate, and the other end of the lower limit travel switch is fixed to the lower limit bracket by bolts; Step (1) specifically includes that when the wire rope is not wound onto the drum, the pressure roller is in close contact with the surface of the drum, the travel switch is in an untriggered state, and it is recognized that the wire rope has reached the lower limit position, thereby controlling the two drums not to perform the lowering action.

6. The method for operating the lower limit device of a steel wire rope according to claim 5, characterized in that: The support rod seat includes a first fixed plate and a second fixed plate. The first fixed plate and the second fixed plate are arranged vertically. A support rod mounting hole is provided on the first fixed plate at a position corresponding to the support rod. One end of the support rod is fixedly installed in the support rod mounting hole. The other end of the support rod is provided with a limiting bolt. A rotating shaft mounting hole is provided on the second fixed plate, and a limiting column is provided on one side of the rotating shaft mounting hole.

7. The method for operating the lower limit device of a steel wire rope according to claim 1, characterized in that: The side surfaces on both sides of the top surface of the fixing member are cambered surfaces, a protrusion is provided on one side of the fixing member, the countersunk hole is provided inside the fixing member near the protrusion, a tapered hole is provided at the end of the countersunk hole near one end of the protrusion, the aperture of the tapered hole is larger than the aperture of the countersunk hole, an inclined portion is provided on the other side of the fixing member near the countersunk hole corresponding to the protrusion, the inclined portion is arranged outward and upward relative to the axial symmetry line of the countersunk hole, a first inclined portion is also provided on the protrusion, the first inclined portion is arranged outward and upward relative to the axial symmetry line of the countersunk hole; the cross section of the countersunk hole is arranged to be arc-shaped, One end of the countersunk hole is connected to an end of the fixing member close to the protrusion, and the other end of the countersunk hole is connected to one end of the rope groove. The angle between the axisymmetric line of the countersunk hole and the axisymmetric line of the rope groove is 170°-175°. The cross-sectional shape of the rope groove is set to be U-shaped, one side of the rope groove opening is set on the upper end surface of the fixing member, the opening size of the rope groove matches the diameter of the wire rope, and the height of the end of the rope groove connected to the countersunk hole from the bottom of the fixing member is higher than the height of the end of the rope groove away from the countersunk hole from the bottom of the fixing member.

8. The method for operating the lower limit device of a steel wire rope according to claim 1, characterized in that: In step (2.1.2.1), one direction is clockwise or counterclockwise, and in step (2.1.2.2), the opposite direction is counterclockwise or clockwise.

Images