Protection device for hydraulic motor of bucket-wheel stacker-reclaimer

Abstract

The utility model discloses a protection device for a hydraulic motor of a bucket-wheel stacker-reclaimer, which belongs to the technical field of hydraulic motors and comprises a protection plate and a plug-in one-way valve. An oil inlet hole and an oil outlet hole are formed in the protection plate; the protective plate is provided with connecting holes around the oil inlet hole and the oil outlet hole; the protection plate is provided with an O-shaped ring mounting groove on the same side of the oil inlet hole and the oil outlet hole; the sides, far away from the O-shaped ring mounting groove, of the oil inlet hole and the oil outlet hole of the protection plate are smooth surfaces; a protection oil way is formed in the protection plate and connected with and penetrates through the oil inlet hole and the oil outlet hole. A screw hole is formed in one side of the protection plate, the screw hole is communicated with the protection oil way, and the screw hole and the protection oil way are perpendicularly distributed. And the plug-in one-way valve is in threaded fit with the screw hole and is fixed in the protection plate. Compared with the prior art, the bucket-wheel hydraulic system can effectively prevent main elements such as a hydraulic motor and a hydraulic pump from being damaged, pipelines from being cracked and the like due to incorrect stop sequence of the bucket-wheel hydraulic system.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, and more specifically, particularly belongs to a protective device for a hydraulic motor of a bucket wheel stacker reclaimer. Background Art

[0002] The bucket wheel mechanism of the bucket wheel stacker reclaimer is driven by a hydraulic motor. The normal start and stop sequence of the hydraulic drive system is as follows:

[0003] The starting order of the drive system is: start the main motor 5 minutes after starting the flushing motor. After starting the main motor, the system will delay for 5 seconds to detect the system's oil replenishment pressure. If normal, the system will give a Ready to use signal. After the main motor starts for 10-15 seconds, the hydraulic motor start signal will be issued after the motor speed has stabilized. The hydraulic motor has a 15-second ramp start time and the motor speed is stable.

[0004] The stopping sequence of the drive system is as follows: the control signal of the electromagnetic proportional valve must be removed first, there is a 10S ramp stopping time, the electromagnetic valve returns to zero position, the speed of the hydraulic motor gradually decreases to zero, and then the main motor is stopped. After the main motor stops steadily, the flushing motor is stopped.

[0005] However, since the bucket wheel system is interlocked with the cantilever belt, sometimes the downstream belt deviates, the material is blocked, the emergency stop and other protection switches are activated and shut down, which will cause the upstream stacker and reclaimer cantilever belt to be interlocked and shut down, causing the bucket wheel main motor to shut down first.

[0006] In addition, sometimes due to operational reasons, the hydraulic system is not stopped, the cantilever belt is stopped first, and the interlocked bucket wheel main motor is stopped first.

[0007] When the equipment stops suddenly, the main motor and flushing motor will be stopped directly.

[0008] Under the above working conditions, the main motor will stop before the hydraulic motor receives the stop signal. The hydraulic motor will be dragged backwards under the force of the bucket wheel's rotational inertia. At this time, its working function changes from hydraulic motor to hydraulic pump. The oil replenishment pump stops, the motor oil inlet pressure drops sharply, the motor oil outlet is closed, and the pressure rises sharply. The consequences are:

[0009] (1) The system oil return pipeline is subjected to high-force impact, causing severe vibration of the pipeline, which is prone to pipeline rupture failure;

[0010] (2) The main motor stops first, the hydraulic pump swash plate cannot return to zero position, and the hydraulic pump is subject to a large hydraulic shock when it stops and restarts, which can easily cause damage to the oil pump;

[0011] (3) The back pressure of the piston connected to the motor oil inlet is insufficient. When the piston is converted to a high-pressure connection with the oil outlet, the roller and the stator ring collide and are damaged, reducing the lubrication effect, increasing the oil temperature, and forming a vicious cycle, which greatly reduces the service life of the motor. Summary of the invention

[0012] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional technology and provide a protection device for the hydraulic motor of a bucket wheel stacker reclaimer, so as to prevent the bucket wheel hydraulic system from causing damage to main components such as the hydraulic motor and hydraulic pump, and pipeline bursting and other faults due to incorrect stopping sequence.

[0013] The utility model provides a protection device for a hydraulic motor of a bucket wheel stacker and reclaimer, comprising a protection plate and a plug-in one-way valve; an oil inlet hole and an oil outlet hole are provided on the protection plate; connecting holes distributed in a ring are provided around the oil inlet hole and the oil outlet hole respectively; an O-ring mounting groove is provided on the same side of the oil inlet hole and the oil outlet hole of the protection plate; a smooth surface is provided on the side of the oil inlet hole and the oil outlet hole away from the O-ring mounting groove; a protection oil circuit is provided inside the protection plate, and the protection oil circuit is connected and passes through the oil inlet hole and the oil outlet hole; a screw hole matched with the plug-in one-way valve is provided on one side of the protection plate, the screw hole is connected with the protection oil circuit, and the screw hole and the protection oil circuit are vertically distributed; the plug-in one-way valve is fixed in the protection plate in cooperation with the screw hole.

[0014] The utility model provides a protection device for the hydraulic motor of a bucket wheel stacker reclaimer, wherein a protection plate is designed between the oil inlet and outlet of the hydraulic motor and the oil pipe, a protection oil circuit is provided inside the protection plate to connect the oil inlet and the oil outlet, and a cartridge check valve is installed in the middle of the protection oil circuit. During normal operation, the pressure at the oil inlet of the hydraulic motor is much higher than that at the oil outlet, the cartridge check valve is closed, and the hydraulic oil normally enters the hydraulic motor from the oil inlet and then flows out from the oil outlet; once the oil inlet pressure is lower than the oil outlet pressure difference and exceeds the opening pressure of the cartridge check valve, the cartridge check valve can quickly respond and open, so that the hydraulic oil at the oil outlet flows back to the oil inlet through the protection oil circuit, and the back pressure of the plunger connected to the oil inlet is supplemented in time, so as to prevent the roller from colliding with the stator ring when the plunger switches between high and low pressure, and at the same time avoid the occurrence of high pressure impact burst failure of the return oil pipeline, which will greatly extend the service life of key components of the hydraulic system.

[0015] It can be seen that, compared with the prior art, the utility model can effectively prevent the bucket wheel hydraulic system from causing damage to main components such as hydraulic motors and hydraulic pumps, and pipeline bursts and other faults due to incorrect stopping sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the utility model;

[0017] Figure 2 It is a rear view of the utility model;

[0018] Figure 3 It is a top view of the utility model.

[0019] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0020] 1. Protection plate; 11. Oil inlet hole; 12. Oil outlet hole; 13. Connection hole; 14. Protection oil circuit; 15. Screw hole; 101. O-ring installation groove; 2. Plug-in one-way valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The utility model provides a protection device for a hydraulic motor of a bucket wheel stacker and reclaimer, comprising a protection plate 1 and a plug-in check valve 2. An oil inlet hole 11 and an oil outlet hole 12 are provided on the protection plate 1. The protection plate 1 is provided with connecting holes 13 distributed in a ring around the oil inlet hole 11 and the oil outlet hole 12; bolts pass through the connecting holes 13 to connect and fix the protection plate 1 with the hydraulic motor, the oil inlet pipe and the oil outlet pipe.

[0025] The protection plate 1 is provided with an O-ring installation groove 101 on the same side of the oil inlet hole 11 and the oil outlet hole 12, and an O-ring is arranged in the O-ring installation groove 101. This side of the protection plate 1 faces the hydraulic motor, and the oil inlet hole 11 and the oil outlet hole 12 correspond to the oil inlet and outlet positions of the hydraulic motor respectively.

[0026] The protective plate 1 is configured with a smooth surface on the side of the oil inlet hole 11 and the oil outlet hole 12 away from the O-ring mounting groove 101, and this smooth surface of the protective plate 1 faces the oil pipe, which is used with its own O-ring; wherein, the oil inlet pipe corresponds to the position of the oil inlet hole 11, and the oil outlet pipe corresponds to the position of the oil outlet hole 12.

[0027] A protective oil circuit 14 is provided inside the protective plate 1, and the protective oil circuit 14 connects and passes through the oil inlet hole 11 and the oil outlet hole 12; a screw hole 15 matching the plug-in one-way valve 2 is provided on one side of the protective plate 1, and the screw hole 15 is connected to the protective oil circuit 14, and the screw hole 15 and the protective oil circuit 14 are vertically distributed; the plug-in one-way valve 2 is fixed in the protective plate 1 in cooperation with the screw hole 15.

[0028] A protective oil circuit 14 is provided inside the protective plate 1, and the protective oil circuit 14 connects and penetrates the oil inlet hole 11 and the oil outlet hole 12. A screw hole 15 matching with the plug-in check valve 2 is provided on one side of the protective plate 1, and the screw hole 15 is connected with the protective oil circuit 14, and the screw hole 15 and the protective oil circuit 14 are vertically distributed. The plug-in check valve 2 is fixed in the protective plate 1 in cooperation with the screw hole 15.

[0029] As can be seen from the above, the protection plate 1 designed by the utility model is installed between the oil inlet and outlet of the hydraulic motor and the oil pipe, and a protection oil circuit 14 is provided inside the protection plate 1 for connecting the oil inlet and the oil outlet, and a cartridge check valve 2 is installed in the middle of the protection oil circuit 14. During normal operation, the pressure at the oil inlet of the hydraulic motor is much higher than that at the oil outlet, the cartridge check valve 2 is closed, and the hydraulic oil normally enters the hydraulic motor from the oil inlet and then flows out from the oil outlet; once the oil inlet pressure is lower than the oil outlet pressure difference and exceeds the opening pressure of the cartridge check valve 2, the cartridge check valve 2 can react and open quickly, so that the hydraulic oil at the oil outlet flows back to the oil inlet through the protection oil circuit 14, and the back pressure of the plunger connected to the oil inlet is supplemented in time to prevent the roller from colliding with the stator ring when the plunger switches between high and low pressure, and at the same time avoid the high pressure impact burst failure of the return oil pipeline, which will greatly extend the service life of the key components of the hydraulic system.

[0030] The specific usage and function of this embodiment are as follows:

[0031] During normal operation, the pressure at the oil inlet of the hydraulic motor is much higher than that at the oil outlet, the cartridge-type one-way valve 2 is closed, and the hydraulic oil normally enters the hydraulic motor from the oil inlet and then flows out from the oil outlet.

[0032] When the hydraulic system stops the main motor first, the bucket wheel is dragged backwards under the force of its rotational inertia, and the hydraulic motor becomes a hydraulic pump. The pressure at the motor inlet drops sharply due to the stop of the oil replenishment pump, and the motor outlet pressure increases. At this time, the outlet pressure is higher than the inlet pressure. After the pressure difference exceeds the opening pressure of the cartridge check valve 2, the cartridge check valve 2 opens, and the hydraulic oil at the outlet flows to the inlet through the protective oil circuit 14 to supplement the back pressure of the inlet plunger, preventing the roller from colliding with the stator ring when the plunger switches between high and low pressures, and at the same time avoiding the high-pressure impact and bursting failure of the return oil pipeline, which will greatly extend the service life of key components of the hydraulic system.

[0033] To sum up, the utility model has a simple and compact structure and is easy to install. Compared with the prior art, it can effectively prevent the bucket wheel hydraulic system from causing damage to main components such as hydraulic motors and hydraulic pumps, pipeline bursts and other faults due to incorrect stopping sequence, thereby effectively extending the service life of the hydraulic motor.

Claims

1. A protective device for a hydraulic motor of a bucket wheel stacker reclaimer, characterized in that: The invention comprises a protective plate (1) and a plug-in check valve (2); the protective plate (1) is provided with an oil inlet hole (11) and an oil outlet hole (12); the protective plate (1) is provided with connecting holes (13) distributed in a ring array around the oil inlet hole (11) and the oil outlet hole (12); the protective plate (1) is provided with an O-ring mounting groove (101) on the same side of the oil inlet hole (11) and the oil outlet hole (12); the protective plate (1) is provided with a plurality of O-ring mounting grooves (101) on the oil inlet hole (11) and the oil outlet hole (12) away from the O-ring mounting groove (102); 101) is provided with a smooth surface; a protective oil circuit (14) is provided inside the protective plate (1), and the protective oil circuit (14) connects and penetrates the oil inlet hole (11) and the oil outlet hole (12); a screw hole (15) is provided on one side of the protective plate (1) to match the plug-in check valve (2), the screw hole (15) and the protective oil circuit (14) are connected, and the screw hole (15) and the protective oil circuit (14) are vertically distributed; the plug-in check valve (2) and the screw hole (15) are fixed in the protective plate (1) in cooperation.

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