On-line monitoring device for position of first rope suspension oil cylinder of elevator

Abstract

The utility model discloses an elevator first rope suspension oil cylinder position on-line monitoring device, a suspension oil cylinder comprises a cylinder body and a piston rod, the cylinder body is fixedly connected with a cage, the piston rod is fixedly connected with a first rope above, the elevator first rope suspension oil cylinder position on-line monitoring device comprises a stay wire displacement sensor, and the stay wire displacement sensor is fixedly connected with the piston rod. A body of the stay wire displacement sensor is fixedly arranged relative to the piston rod, and a stay wire of the stay wire displacement sensor is mechanically connected with the cage; when the distance between the piston rod and the cage changes, the length signal obtained by the stay wire displacement sensor changes accordingly. The expansion and contraction amount of the suspension oil cylinder is detected through the stay wire displacement sensor, manual monitoring is not needed, the labor intensity is reduced, the monitoring efficiency is improved, the labor cost is reduced, and meanwhile the timeliness of fault monitoring is ensured.

Description

Technical Field

[0001] This utility model relates to a monitoring device for a hoist. Background Technology

[0002] Blind shaft hoists typically employ a multi-rope friction structure and are equipped with four lead ropes. Due to the potential for rope slippage during operation, coupled with variations in the groove depth of the hoist drum, uneven stress often occurs among the four lead ropes. To address this issue, suspension cylinders are connected between each lead rope and the cage, and the internal cavities of all suspension cylinders are interconnected. When a lead rope experiences a higher tension, the pressure within the corresponding suspension cylinder increases, and the tension is distributed to the other suspension cylinders through extension and retraction, thus achieving tension balance among the four lead ropes.

[0003] However, after prolonged operation, the suspension cylinder may experience insufficient stroke, causing it to reach its limit position (top or bottom) and become unable to continue balancing the force on the head rope. In this situation, individual wire ropes may bear excessive tension, leading to accelerated wear and potentially causing serious accidents such as diameter reduction or wire breakage. To avoid these problems, the traditional method is to regularly inspect the suspension cylinder's working status on-site and pressurize or depressurize it when insufficient adjustment distance is found. However, this method is not only labor-intensive, inefficient, and costly, but also poses a significant safety hazard if the problem is not detected in time, as damage to the head rope can be irreversible. Utility Model Content

[0004] This utility model proposes an online monitoring device for the position of the suspension cylinder of the hoist's head rope. Its purpose is to: 1. Solve the problems of high labor intensity, low efficiency, and high labor costs associated with manual periodic inspections; 2. Solve the problem of failing to detect insufficient adjustment distance of the suspension cylinder in a timely manner.

[0005] The technical solution of this utility model is as follows:

[0006] An online monitoring device for the position of the hoist's head rope suspension cylinder is disclosed. The suspension cylinder includes a cylinder body and a piston rod. The cylinder body is fixedly connected to the cage, and the piston rod is fixedly connected to the head rope above. The online monitoring device for the position of the hoist's head rope suspension cylinder includes a pull wire displacement sensor. The body of the pull wire displacement sensor is fixedly set relative to the piston rod, and the pull wire of the pull wire displacement sensor is mechanically connected to the cage. When the distance between the piston rod and the cage changes, the length signal acquired by the pull wire displacement sensor changes accordingly.

[0007] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder: the end of the pull line is fixedly connected to the cage.

[0008] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder: the piston rod is connected to the corresponding head rope via a connecting rod;

[0009] A mounting bracket is installed on the connecting rod, and the body of the pull wire displacement sensor is mounted on the mounting bracket;

[0010] A fixing frame is installed on the top of the cage, and a pulley is installed on the fixing frame. The pull line passes around the pulley and its end is connected to the mounting frame.

[0011] As a further improvement to the online monitoring device for the position of the hoist head rope suspension cylinder: a first longitudinal groove is provided on the bottom plate of the fixing frame, and the fixing frame is installed on the cage by fixing bolts passing through the first longitudinal groove.

[0012] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder: the pulley is a V-groove bearing, which is mounted on a fixed frame via an adjustable shaft; the adjustable shaft includes an external hexagonal section, an external threaded section, and a smooth rod section connected in sequence, wherein the outer diameter of the external threaded section is larger than the outer diameter of the smooth rod section; the inner ring of the V-groove bearing is fixed to the smooth rod section and rests against the end of the external threaded section;

[0013] The fixed frame is provided with a first upright plate and a second upright plate arranged in a left-right arrangement, and the V-groove bearing is located between the first upright plate and the second upright plate; the external threaded part is engaged with the threaded hole on the first upright plate, and the smooth rod part is slidably engaged with the smooth hole on the second upright plate.

[0014] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder, a first fastening nut is also installed on the external threaded part.

[0015] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder: the end of the pull line is provided with a connecting thread head;

[0016] The mounting bracket has a second longitudinal groove on its base plate. The connecting thread head passes upward through the second longitudinal groove and is fixed to the mounting bracket by two sets of second fastening nuts located on the upper and lower sides of the second longitudinal groove.

[0017] As a further improvement to the online monitoring device for the position of the hoist's head rope suspension cylinder: the mounting bracket is installed on the connecting rod via a U-shaped bracket and a bolt and nut assembly.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. This utility model uses a wire displacement sensor to detect the extension and retraction of the suspension cylinder, eliminating the need for manual monitoring, reducing labor intensity, improving monitoring efficiency, reducing labor costs, and ensuring the timeliness of fault monitoring.

[0020] 2. This utility model further adopts a pulley structure to amplify the wire displacement. When the piston rod moves a certain distance, the wire displacement sensor can obtain a change of twice the distance, thereby doubling the displacement accuracy and sensitivity. This avoids the situation where the suspension cylinder cannot effectively and accurately obtain the length change when it is close to the limit position, which would lead to the failure to issue a timely warning.

[0021] 3. This utility model uses a groove structure and an adjustable rotating shaft to adjust the horizontal position of the pulley and the connecting threaded sleeve, ensuring that the pull line is parallel to the piston rod, thus improving the monitoring accuracy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0024] Figure 3 A top view of the fixed frame, V-groove bearings, and adjustable shaft, etc.

[0025] Figure 4 This is a top view of the connecting rod, U-shaped bracket, mounting bracket, and wire displacement sensor, among other components.

[0026] Figure 5 This diagram illustrates the communication connections between the wire displacement sensor, the cage electrical control system, the wellhead electrical control cabinet, and the hoisting main control system. Detailed Implementation

[0027] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0028] An online monitoring device for the position of a hoist head rope suspension cylinder is disclosed. The suspension cylinder includes a cylinder body and a piston rod. The cylinder body is fixedly connected to the cage, and the piston rod is fixedly connected to the head rope above.

[0029] The special feature of the online monitoring device for the position of the hoist's head rope suspension cylinder is that it includes a wire displacement sensor. The body of the wire displacement sensor is fixedly installed relative to the piston rod, and the wire of the wire displacement sensor is mechanically connected to the cage. When the distance between the piston rod and the cage changes, the length signal acquired by the wire displacement sensor changes accordingly. The length signal can be used to determine whether the suspension cylinder has reached its limit position (or to determine the remaining effective adjustment distance). Example 1

[0030] In this embodiment, the pull wire is directly and fixedly connected to the top of the cage (by means of threaded connection or knotting).

[0031] Furthermore, such as Figure 5 The wire displacement sensor 9 is connected to the cage electrical control box via 485 communication. The cage electrical control device 15 in the cage electrical control box compares the acquired length signal with a length threshold, which refers to the length signal value of the wire displacement sensor 9 when the suspension cylinder extends or retracts to its limit position. Based on the comparison result, it can be determined whether the suspension cylinder has reached its limit position, thus obtaining the monitoring result.

[0032] Furthermore, the cage electrical control device 15 sends the monitoring results to the first wireless base station 16. The first wireless base station 16 is communicatively connected to the second wireless base station 17 on the wellhead electrical control cabinet. The second wireless base station 17 forwards the received monitoring results to the first switch 20 and the human-machine interface 18 through the main control device 19. The operator can view the current monitoring results through the human-machine interface 18. At the same time, the first switch 20 sends the monitoring results to the second switch 21 of the hoisting main control system via a network cable. The second switch 21 forwards the monitoring results to the alarm 22. When the monitoring results indicate that the suspension cylinder has reached its limit position, the alarm 22 issues an audible and visual alarm. Example 2

[0033] The difference between this embodiment and Embodiment 1 lies in the mechanical connection method between the pull wire and the cage.

[0034] like Figure 1 The piston rod 3 is connected to the corresponding head rope via the connecting rod 1.

[0035] like Figure 1 and 4 The mounting bracket 8 is clamped onto the connecting rod 1 by a U-shaped bracket 2 and two sets of bolt and nut assemblies 13. The body of the pull-wire displacement sensor 9 is mounted on the front upright plate of the mounting bracket 8, passing downward through an opening in the bottom plate of the mounting bracket 8.

[0036] like Figure 1 , 23. A fixing frame 5 is installed on the top of the cage, and a pulley is installed on the fixing frame 5. The pull wire passes over the pulley and its end is connected to the mounting frame 8. Specifically, as shown... Figure 4 The end of the pull cable is provided with a connecting threaded head 7 (factory-provided). The base plate of the mounting bracket 8 is provided with a second longitudinal groove 8-1 (located directly behind the output end of the pull cable displacement sensor 9). The connecting threaded head 7 passes upward through the second longitudinal groove 8-1 and is fixed to the mounting bracket 8 by two sets of second fastening nuts 14 located on the upper and lower sides of the second longitudinal groove 8-1. Loosening the second fastening nuts 14 allows adjustment of the front-to-back position of the pull cable end.

[0037] Furthermore, the base plate of the fixing frame 5 is provided with a first longitudinal groove 5-3, and the fixing frame 5 is installed on the cage by fixing bolts 12 passing through the first longitudinal groove 5-3. After loosening the fixing bolts 12, the position of the fixing frame 5 can be adjusted back and forth.

[0038] Furthermore, the pulley is a V-groove bearing 6, which is mounted on the fixed frame 5 via an adjustable shaft 10. The pull wire winds around the V-groove on the outer surface of the V-groove bearing 6. Figure 2 The adjustable shaft 10 includes a hexagonal outer section, an external threaded section 10-1, and a smooth section 10-2 connected in sequence. The outer diameter of the external threaded section 10-1 is larger than the outer diameter of the smooth section 10-2. The inner ring of the V-groove bearing 6 is fixed to the smooth section 10-2 by an interference fit and rests against the end of the external threaded section 10-1. The fixing frame 5 has a first upright plate 5-1 and a second upright plate 5-2 arranged left and right, and the V-groove bearing 6 is located between the first upright plate 5-1 and the second upright plate 5-2. The external threaded section 10-1 is engaged with the threaded hole on the first upright plate 5-1, and the smooth section 10-2 is engaged with the smooth hole on the second upright plate 5-2. A first fastening nut 11 is also installed on the external threaded section 10-1.

[0039] During installation, first fix the cable displacement sensor 9 to the mounting bracket 8, then pull the cable downwards, pass it around the V-groove bearing 6, and then fix the connecting threaded head 7 in the second longitudinal groove 8-1. During fixing, adjust the front and rear positions of the connecting threaded head 7 to ensure that the horizontal distance between the downward and upward cables is equal to the inner diameter of the V-groove. Then, adjust the position of the fixing bracket 5 along the first longitudinal groove 5-3 so that the downward and upward cables are located in two parallel vertical planes, and tighten the fixing bolts 12. Finally, rotate the adjustable shaft 10 to adjust the left and right positions of the V-groove bearing 6 under the action of the threaded engagement until both the downward and upward cables are vertical (i.e., parallel to the suspension cylinder). At this point, tighten the first fastening nut 11 to achieve the positioning of the V-groove bearing 6.

[0040] During operation, as the suspension cylinder extends and retracts, the cable displacement sensor 9 captures the current cable length. Furthermore, due to the pulley's reciprocating design, when the suspension cylinder extends or retracts by x, the cable displacement sensor 9 will detect a length change signal of 2x, thereby improving monitoring accuracy and sensitivity. It should be noted that the subsequent cage control device 15 will automatically convert the length signal and then compare it with a threshold value.

[0041] In this embodiment, the transmission of the length signal and the alarm indication method of the wire displacement sensor are the same as in Embodiment 1, and will not be described again here.

[0042] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. An online monitoring device for the position of a hoist head rope suspension cylinder, wherein the suspension cylinder comprises a cylinder body (4) and a piston rod (3), the cylinder body (4) being fixedly connected to a cage, and the piston rod (3) being fixedly connected to the head rope above, characterized in that: The online monitoring device for the position of the hoist head rope suspension cylinder includes a pull wire displacement sensor (9). The body of the pull wire displacement sensor (9) is fixed relative to the piston rod (3), and the pull wire of the pull wire displacement sensor (9) is mechanically connected to the cage. When the distance between the piston rod (3) and the cage changes, the length signal obtained by the pull wire displacement sensor (9) changes accordingly.

2. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 1, characterized in that: The end of the pull wire is fixedly connected to the cage.

3. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 1, characterized in that: The piston rod (3) is connected to the corresponding head rope via a connecting rod (1); A mounting bracket (8) is installed on the connecting rod (1), and the body of the pull wire displacement sensor (9) is installed on the mounting bracket (8); The top of the cage is equipped with a fixing frame (5), and a pulley is installed on the fixing frame (5). The pull wire passes around the pulley and its end is connected to the mounting frame (8).

4. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 3, characterized in that: The base plate of the fixing frame (5) is provided with a first longitudinal groove (5-3), and the fixing frame (5) is installed on the cage by fixing bolts (12) passing through the first longitudinal groove (5-3).

5. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 3, characterized in that: The pulley is a V-groove bearing (6), which is mounted on the fixed frame (5) via an adjustable shaft (10). The adjustable shaft (10) includes an external hexagonal part, an external threaded part (10-1), and a smooth rod part (10-2) connected in sequence. The outer diameter of the external threaded part (10-1) is larger than the outer diameter of the smooth rod part (10-2). The inner ring of the V-groove bearing (6) is fixed on the smooth rod part (10-2) and rests against the end of the external threaded part (10-1). The fixing frame (5) is provided with a first upright plate (5-1) and a second upright plate (5-2) arranged in a left-right arrangement. The V-groove bearing (6) is located between the first upright plate (5-1) and the second upright plate (5-2). The external threaded part (10-1) is engaged with the threaded hole on the first upright plate (5-1), and the smooth rod part (10-2) is slidably engaged with the smooth hole on the second upright plate (5-2).

6. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 5, characterized in that: A first fastening nut (11) is also installed on the external threaded part (10-1).

7. The online monitoring device for the position of the hoist head rope suspension cylinder as described in claim 3, characterized in that: The end of the pull wire is provided with a connecting thread head (7); The mounting bracket (8) has a second longitudinal groove (8-1) on its base plate. The connecting thread head (7) passes upward through the second longitudinal groove (8-1) and is fixed to the mounting bracket (8) by two sets of second fastening nuts (14) located on the upper and lower sides of the second longitudinal groove (8-1).

8. The online monitoring device for the position of the hoist head rope suspension cylinder as described in any one of claims 3 to 7, characterized in that: The mounting bracket (8) is mounted on the connecting rod (1) via a U-shaped bracket (2) and a bolt and nut assembly (13).

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