Rope adjusting safety interlocking protection device for single-rope winding hoister

Abstract

The utility model discloses a rope adjusting safety interlocking protection device of a single-rope winding elevator. The rope adjusting safety interlocking protection device comprises a change-over switch, a relay KA, a two-position two-way electromagnetic valve and an oil drainage loop. A pipeline for connecting the first output end of the three-position four-way electromagnetic valve and the first oil cavity is connected with one end of an oil drainage loop through a tee joint, and the other end of the oil drainage loop is communicated with an oil tank of the hydraulic station; the two-position two-way electromagnetic valve is mounted on the oil drainage loop; the change-over switch is electrically connected with the PLC device and used for controlling the PLC device to be switched between a rope adjusting mode and a lifting mode. The auxiliary contact of the change-over switch and the coil of the relay KA are connected in series between the positive electrode and the negative electrode of the power supply. The normally-closed contact of the relay KA and the two-position two-way electromagnetic valve are connected in series between the positive electrode and the negative electrode of the power supply. An oil drainage loop is automatically opened during lifting, so that accidental action of the rope adjusting oil cylinder is avoided, and accidents such as tank falling are avoided.

Description

Technical Field

[0001] The utility model relates to a protection device for a hoist. Background Art

[0002] The single-rope winding hoist is a commonly used mine hoisting equipment, and realizes the hoisting and lowering of the cage by winding and releasing the steel wire rope on the drum.

[0003] The hoist needs to perform rope adjustment operations regularly. When adjusting the rope, after the PLC controller receives the rope adjustment mode signal, it controls the action of the rope adjustment oil cylinder through a solenoid valve (generally a three-position four-way solenoid valve), disconnects the clutch, separates the two drums, and then the PLC controller executes the rope adjustment program. After the rope adjustment is completed, the PLC controller controls the rope adjustment oil cylinder to return to its original position through the solenoid valve, the clutch engages, and the two drums resume synchronous movement. Thereafter, the PLC controller receives the hoisting mode signal and starts to control the normal operation of the hoist.

[0004] However, once the solenoid valve used to control the rope adjustment oil cylinder fails, even in the hoisting mode, the rope adjustment oil cylinder will act under the drive of the hydraulic oil, resulting in accidental disconnection of the clutch and accidents such as cage dropping. Although many production sites have added manual valves between the solenoid valve and the rope adjustment oil cylinder and require operators to close the manual valve after entering the hoisting mode, in actual operation, the situation of forgetting to close the valve or the valve not being closed tightly often occurs, and the occurrence of accidents cannot be effectively avoided. Summary of the Utility Model

[0005] The utility model provides a rope adjustment safety interlock protection device for a single-rope winding hoist, and its purpose is to solve the problem that the rope adjustment oil cylinder will act accidentally when the solenoid valve fails in the hoisting mode of the hoist.

[0006] The technical solution of the utility model is as follows:

[0007] A rope adjustment safety interlock protection device for a single-rope winding hoist, the hoist includes a clutch, a PLC device, a hydraulic station and a rope adjustment oil cylinder, the hydraulic station includes a three-position four-way solenoid valve, the PLC device is used to control the three-position four-way solenoid valve, the first output end and the second output end of the three-position four-way solenoid valve are respectively communicated with the first oil chamber and the second oil chamber of the rope adjustment oil cylinder, when the first oil chamber inputs hydraulic oil, the rope adjustment oil cylinder drives the clutch to disconnect, and the rope adjustment safety interlock protection device for a single-rope winding hoist includes a change-over switch, a relay KA, a two-position two-way solenoid valve and an oil drain circuit;

[0008] One end of the oil drain circuit is connected to the pipeline connecting the first output end of the three-position four-way solenoid valve and the first oil chamber through a tee, and the other end of the oil drain circuit is communicated with the oil tank of the hydraulic station;

[0009] The two-position two-way solenoid valve is installed on the oil drain return line;

[0010] The changeover switch is electrically connected to the PLC device and is used to control the PLC device to switch between the rope adjustment mode and the hoisting mode; the auxiliary contact of the changeover switch is also connected in series with the coil of the relay KA between the positive and negative poles of the power supply, and the normally closed contact of the relay KA and the two-position two-way solenoid valve are connected in series between the positive and negative poles of the power supply.

[0011] As a further improvement of the rope adjustment safety interlock protection device for the single-rope winding hoist: a first manual valve is also provided on the pipeline connecting the first output end of the three-position four-way solenoid valve and the first oil chamber.

[0012] As a further improvement of the rope adjustment safety interlock protection device for the single-rope winding hoist: a second manual valve is provided on the pipeline connecting the second output end of the three-position four-way solenoid valve and the second oil chamber.

[0013] As a further improvement of the rope adjustment safety interlock protection device for the single-rope winding hoist: the changeover switch is installed on the operating platform of the hoist.

[0014] Compared with the prior art, the present utility model has the following positive effects:

[0015] On the basis of the existing structure, the present utility model further adds a changeover switch and an oil drain return line. When the changeover switch is switched to the hoisting mode, the two-position two-way solenoid valve on the oil drain return line will be opened through the relay, so that the first oil chamber of the rope adjustment oil cylinder is communicated with the fuel tank. At this time, even if the three-position four-way solenoid valve fails, the hydraulic oil delivered to the rope adjustment oil cylinder will directly return to the fuel tank along the oil drain return line, and the rope adjustment oil cylinder will not move accidentally, thus avoiding accidents such as cage dropping. Description of the Drawings

[0016] Figure 1 is the hydraulic schematic diagram of the present utility model;

[0017] Figure 2 is the electrical schematic diagram of the present utility model. Detailed Description of the Preferred Embodiment

[0018] The technical solution of the present utility model will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0019] The single-rope winding hoist includes devices such as a clutch, a drum, a cage, a PLC device, a hydraulic station, and a rope adjustment oil cylinder 4. Among them, as Figure 1 and 2, the hydraulic station includes an oil pump, an oil tank 7, a three-position four-way solenoid valve 1, etc. The PLC device is used to control the actions of the three-position four-way solenoid valve 1 and other solenoid valves on the hydraulic station. The first output end and the second output end of the three-position four-way solenoid valve 1 are respectively connected to the first oil chamber and the second oil chamber of the rope-adjusting cylinder 4.

[0020] When the three-position four-way solenoid valve 1 is in the first working position, hydraulic oil is input into the first oil chamber, and the piston rod of the rope-adjusting cylinder 4 extends, driving the clutch to disengage. At this time, the rope-adjusting operation can be carried out; when the three-position four-way solenoid valve 1 is in the second working position, hydraulic oil is input into the second oil chamber, and the piston rod of the rope-adjusting cylinder 4 retracts, and the clutch engages. At this time, the hoist can work normally.

[0021] Furthermore, a first manual valve 2 is provided on the pipeline connecting the first output end of the three-position four-way solenoid valve 1 and the first oil chamber, and a second manual valve 3 is provided on the pipeline connecting the second output end of the three-position four-way solenoid valve 1 and the second oil chamber. Before the hoist works normally, the above-mentioned manual valves can be closed to prevent the clutch from accidentally disengaging.

[0022] However, in actual work, the three-position four-way solenoid valve 1 often fails or the valve is forgotten to be closed. Therefore, this embodiment proposes a rope-adjusting safety interlock protection device for a single-rope winding hoist. It includes a changeover switch 8, a relay KA, a two-position two-way solenoid valve 6 and an oil drain circuit 5.

[0023] One end of the oil drain circuit 5 is connected to the pipeline connecting the first output end of the three-position four-way solenoid valve 1 and the first oil chamber through a tee, and the other end of the oil drain circuit 5 is connected to the oil tank 7 of the hydraulic station. The two-position two-way solenoid valve 6 is installed on the oil drain circuit 5.

[0024] The changeover switch 8 is installed on the console of the hoist. The changeover switch 8 is electrically connected to the PLC device and is used to control the PLC device to switch between the rope-adjusting mode and the hoisting mode (or other non-rope-adjusting modes). The auxiliary contact of the changeover switch 8 is also connected in series with the coil of the relay KA between the positive and negative poles of the power supply, and the normally closed contact of the relay KA and the two-position two-way solenoid valve 6 are connected in series between the positive and negative poles of the power supply.

[0025] When the operator switches the conversion switch 8 to the rope adjustment mode, its auxiliary contact is closed, the relay KA is energized, and the normally closed contact is disconnected. At this time, the two-position two-way solenoid valve 6 is not energized and is in a closed state, and the rope adjustment cylinder 4 operates under the control of the three-position four-way solenoid valve 1. After completing the rope adjustment, before the formal work, the operator must switch the conversion switch 8 to the non-rope adjustment mode to run the lifting program in the PLC device. At this time, the auxiliary contact of the conversion switch 8 is disconnected, the relay KA loses power, the normally closed contact is closed, the two-position two-way solenoid valve 6 is energized and opened, and the oil leakage circuit 5 is connected. Therefore, even in the extreme case that the operator forgets to close the manual valve and the three-position four-way solenoid valve 1 fails, the hydraulic oil output from the first output end of the three-position four-way solenoid valve 1 will directly return to the oil tank 7 along the oil leakage circuit 5, and the rope adjustment cylinder 4 will not operate, thereby avoiding the occurrence of accidents.

[0026] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A safety interlocking protection device for adjusting the rope of a single-rope winding hoist, the hoist comprising a clutch, a PLC device, a hydraulic station and a rope adjusting cylinder (4), the hydraulic station comprising a three-position four-way solenoid valve (1), the PLC device being used to control the three-position four-way solenoid valve (1), the first output end and the second output end of the three-position four-way solenoid valve (1) being respectively connected to the first oil chamber and the second oil chamber of the rope adjusting cylinder (4), when hydraulic oil is input into the first oil chamber, the rope adjusting cylinder (4) drives the clutch to disconnect, characterized in that: The single-rope winding hoist rope adjustment safety interlocking protection device comprises a conversion switch (8), a relay KA, a two-position two-way solenoid valve (6) and an oil drain circuit (5); The pipeline connecting the first output end of the three-position four-way solenoid valve (1) and the first oil chamber is connected to one end of an oil drain circuit (5) via a three-way connection, and the other end of the oil drain circuit (5) is connected to an oil tank (7) of a hydraulic station; The two-position two-way solenoid valve (6) is installed on the oil drain circuit (5); The conversion switch (8) is electrically connected to the PLC device and is used to control the PLC device to switch between the rope adjustment mode and the lifting mode; the auxiliary contact of the conversion switch (8) is also connected in series with the coil of the relay KA between the positive and negative poles of the power supply, and the normally closed contact of the relay KA and the two-position two-way solenoid valve (6) are connected in series between the positive and negative poles of the power supply.

2. The single-rope winding hoist rope adjustment safety interlocking protection device according to claim 1 is characterized in that: A first manual valve (2) is also provided on the pipeline connecting the first output end of the three-position four-way solenoid valve (1) and the first oil chamber.

3. The single rope winding hoist rope adjustment safety interlocking protection device according to claim 1 is characterized in that: A second manual valve (3) is provided on a pipeline connecting the second output end of the three-position four-way solenoid valve (1) and the second oil chamber.

4. The single-rope winding hoist rope adjustment safety interlocking protection device according to any one of claims 1 to 3, characterized in that: The conversion switch (8) is installed on the operating table of the hoist.

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