Negative pressure sealing system and method for single-cylinder hydraulic cone crusher boom

Abstract

The invention discloses a negative pressure sealing system and method for a single-cylinder hydraulic cone crusher boom, the system is constructed around a cone crusher main shaft and other parts, a closed boom interior containing lubricating grease is defined by an upper boom, and the main shaft and the upper boom are dynamically matched through a boom oil seal. The hard pipe, the three-way connector (with the pressure sensor), the vacuum generator, the reversing valve and the air compressor form an air channel, and the PLC control unit controls switching of the reversing valve according to data of the pressure sensor in combination with set air pressure threshold logic, so that air exhaust, air supplement and leakage alarm are achieved. The internal air pressure of the arm support is accurately controlled, stability of lubricating grease is guaranteed, when the air pressure is abnormal, air exhausting and air supplementing are conducted in time, alarming is continuously triggered when the air pressure is abnormal, lubricating grease loss is effectively reduced, leakage is prevented, equipment operation reliability and stability are improved, and efficient work of the cone crusher is assisted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine and aggregate processing equipment, and particularly relates to a negative pressure sealing method for an arm frame of a single-cylinder hydraulic cone crusher. BACKGROUND

[0002] The working principle of the single-cylinder hydraulic cone crusher is that an eccentric sleeve drives a main shaft assembly to perform a periodic circular swing movement, and the swing movement completes the extrusion and crushing of the material. Three support points are needed in the movement of the main shaft, the bottom provides upward support force through a thrust bearing assembly, the lower part provides swing driving force through an eccentric assembly, and the upper part leans on the arm frame to provide horizontal support force. At the support point of the arm frame, the main shaft has up-and-down translation movement, revolution movement around the center of the device, and rotation movement driven by the material, and the movement track is very complex. The sealing form at this point is to install two rubber lip-shaped oil seal rings at the lower part of the arm frame, the main shaft penetrates through the seal rings, the inner diameter of the seal ring is slightly smaller than the main shaft, and the seal ring tightly holds the main shaft through compression characteristics to prevent the lubricating grease from flowing out. However, due to the particularity of the sealing environment, the rubber ring seal ring is prone to failure forms such as wear, aging and edge turning, and the upward movement of the main shaft is prone to cause excessive air pressure in the arm frame, which can easily cause the lubricating grease to leak out, form dry grinding at the main shaft and the arm frame, cause the movement track of the main shaft to deform, and finally cause the high-temperature burning of the parts at each support point of the main shaft. Moreover, the point is covered by the material and cannot be directly found, so the problem becomes a common stubborn problem of the cone crusher. SUMMARY

[0003] In view of the technical problems in the prior art, a negative pressure sealing system for an arm frame of a single-cylinder hydraulic cone crusher is provided, which comprises: a main shaft; an upper arm frame arranged above the main shaft; an arm frame interior, which is a closed space surrounded by the upper arm frame and is arranged at the upper part of the main shaft, and the arm frame interior is provided with lubricating grease; an arm frame oil seal arranged at the side of the main shaft and located between the main shaft and the upper arm frame so that the main shaft and the upper arm frame dynamically cooperate; a hard pipe, one end of which is connected to the arm frame interior; a three-way joint, one end of which is connected to the other end of the hard pipe, and the three-way joint is further provided with a control end, and the control end is provided with a pressure sensor; a vacuum generator, one end of which is connected to the other end of the three-way joint; a reversing valve is further arranged between the three-way joint and the vacuum generator; an air compressor, one end of which is connected to the other end of the vacuum generator; a PLC control unit, which is electrically connected to the pressure sensor, the reversing valve and the vacuum generator; The PLC control unit is configured to execute the following control logic. A dynamic air pressure threshold A is set, satisfying A+B=C, and α·β·D / E≤B≤α·γ·D / E; Wherein, A is the target air pressure value inside the arm support, B is the pressure difference between the inside and outside of the arm support, C is the standard atmospheric pressure, D is the gravity of the lubricating grease, E is the cross-sectional area of the arm support bushing, α is the lubricating grease loss coefficient, β is the leakage stop coefficient, and γ is the suction stop coefficient; When the detection value of the pressure sensor is greater than A, the reversing valve is controlled to be turned on to allow the vacuum generator to exhaust until the air pressure returns to the value A; When the main shaft is lowered to cause the air pressure to be less than the value F, the direction of the reversing valve is switched to allow the air compressor to supply air to the value A; if the value A cannot be reached continuously, a lubricating grease leakage alarm is triggered; wherein F is a preset threshold value.

[0004] Further, the system is also provided with an air compressor, one end of which is connected to the other end of the vacuum generator.

[0005] Further, the vacuum generator and the air compressor are connected through a high-pressure hose, and the air exhaust rate of the vacuum generator is adjustable.

[0006] Further, the gap between the arm support bushing and the main shaft is 0.05-0.1mm, and the inner surface of the bushing is provided with a spiral oil groove.

[0007] Further, the detection accuracy of the pressure sensor is not less than ±50Pa, and the sampling frequency is greater than or equal to 10Hz.

[0008] Further, the system further comprises: an arm support outside, which is arranged on the side of the main shaft and between the main shaft and the upper arm support.

[0009] Further, the system further comprises: An arm support bushing is sleeved on the main shaft.

[0010] A negative pressure sealing method for a single-cylinder hydraulic cone crusher arm support, comprising a negative pressure sealing system for a single-cylinder hydraulic cone crusher arm support as described above, characterized by comprising the following steps: S1: initializing the PLC control unit, and setting the initial values of the dynamic parameters α, β and γ; S2: automatically adjusting the value of α according to the real-time detection of the lubricating grease state; S3: setting the dynamic air pressure threshold value established and maintained by the vacuum generator; S4: when the main shaft is doing a swing motion, automatically switching the air exhaust / supplement mode according to the pressure fluctuation.

[0011] The beneficial effects of the present application are: The application precisely controls the internal air pressure of the arm frame, guarantees the stability of the lubricating grease, timely pumps and supplies air when the air pressure is abnormal, continuously triggers the alarm when the air pressure is abnormal, effectively reduces the lubricating grease loss and prevents leakage, improves the operation reliability and stability of the equipment, and helps the conical crusher to work efficiently. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of a negative pressure sealing system of a single-cylinder hydraulic conical crusher arm frame of the application.

[0013] In the schematic view: (1) main shaft, (2) arm frame interior, (3) arm frame oil seal, (4) hard pipe, (5) three-way joint, (6) vacuum generator, (7) air compressor, (8) pressure sensor, (9) lubricating grease, (10) arm frame exterior, (11) arm frame bushing, (E) arm frame bushing diameter. DETAILED DESCRIPTION

[0014] The embodiments of the application are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the application from the disclosure of the specification. The application can also be implemented or applied by different specific embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the application.

[0015] REFERENCE Figure 1 A negative pressure sealing system of a single-cylinder hydraulic conical crusher arm frame, comprising: a main shaft 1; an upper arm frame arranged above the main shaft; an arm frame interior 2, which is a closed space surrounded by the upper arm frame and arranged at the upper part of the main shaft, and the arm frame interior is provided with lubricating grease; an arm frame oil seal 3 arranged at the side of the main shaft and located between the main shaft and the upper arm frame so that the main shaft and the upper arm frame are dynamically matched; a hard pipe 4, one end of which is connected to the arm frame interior; a three-way joint 5, one end of which is connected to the other end of the hard pipe, and the three-way joint is further provided with a control end, and the control end is provided with a pressure sensor 8; a vacuum generator 6, one end of which is connected to the other end of the three-way joint; a reversing valve further arranged between the three-way joint and the vacuum generator; an air compressor 7, one end of which is connected to the other end of the vacuum generator; a PLC control unit, which is electrically connected to the pressure sensor, the reversing valve and the vacuum generator; The PLC control unit is configured to execute the following control logic. A dynamic pressure threshold A is set, satisfying A+B=C, and α·β·D / E≤B≤α·γ·D / E; Wherein, A is the target internal pressure value of the arm support, B is the internal and external pressure difference of the arm support, C is the standard atmospheric pressure, D is the gravity of the lubricating grease, E is the cross-sectional area of the arm support bushing, α is the lubricating grease loss coefficient, β is the leakage stop coefficient, and γ is the suction stop coefficient; When the detection value of the pressure sensor is greater than A, the reversing valve is controlled to be turned on to allow the vacuum generator to exhaust until the air pressure returns to the value A; When the main shaft is lowered to cause the air pressure to be less than the value F, the direction of the reversing valve is switched to allow the air compressor to supplement air to the value A; when the value A cannot be reached continuously, a lubricating grease 9 leakage alarm is triggered; wherein F is a preset threshold value.

[0016] Further, the system is also provided with an air compressor 8, one end of which is connected to the other end of the vacuum generator.

[0017] Further, the vacuum generator and the air compressor are connected through a high-pressure hose, and the air exhaust rate of the vacuum generator is adjustable.

[0018] Further, the gap between the arm support bushing 11 and the main shaft is 0.05-0.1mm, and the inner surface of the bushing is provided with a spiral oil groove.

[0019] Further, the detection accuracy of the pressure sensor is not less than ±50Pa, and the sampling frequency is ≥10Hz.

[0020] Further, the system further comprises: an arm support outside 10, which is arranged on the side of the main shaft and between the main shaft and the upper arm support.

[0021] Further, the system further comprises: An arm support bushing is sleeved on the main shaft.

[0022] A negative pressure sealing method for a single-cylinder hydraulic cone crusher arm support, comprising a negative pressure sealing system for a single-cylinder hydraulic cone crusher arm support as described above, characterized in that it comprises the following steps: S1: initializing the PLC control unit and setting the initial values of the dynamic parameters α, β, and γ; S2: automatically adjusting the α value according to the real-time detection of the lubricating grease state; S3: setting a dynamic pressure threshold value established and maintained by the vacuum generator; S4: when the main shaft is doing a swing motion, automatically switching the air exhaust / supplement mode according to the pressure fluctuation.

[0023] The application is described in detail above with reference to the drawings. Those skilled in the art can make various changes to the application according to the above description. Therefore, some details in the embodiments should not be regarded as limiting the application, and the application will be protected within the scope defined by the appended claims.

Claims

1. A negative pressure sealing system for the boom of a single-cylinder hydraulic cone crusher, characterized in that, include: spindle; The upper boom is located above the main shaft; The inside of the boom is a closed space enclosed by the upper boom, located above the main shaft, and the inside of the boom is equipped with lubricating grease; The boom oil seal is located on the side of the main shaft, between the main shaft and the upper boom, so that the main shaft and the upper boom can dynamically cooperate. A rigid tube, one end of which is connected to the inside of the boom; A tee connector, one end of which is connected to the other end of the rigid pipe, is also provided with a control end, and the control end is provided with a pressure sensor; A vacuum generator, one end of which is connected to the other end of the tee connector; A reversing valve is also provided between the three-way connector and the vacuum generator; An air compressor, one end of which is connected to the other end of the vacuum generator; The PLC control unit is electrically connected to the pressure sensor, the reversing valve, and the vacuum generator. The PLC control unit is configured to execute the following control logic; Set a dynamic air pressure threshold A, satisfying A+B=C, and α·β·D / E≤B≤α·γ·D / E; Where A is the target air pressure inside the boom, B is the pressure difference between the inside and outside of the boom, C is the standard atmospheric pressure, D is the weight of the grease, E is the cross-sectional area of ​​the boom bushing, α is the grease loss coefficient, β is the leakage control coefficient, and γ is the suction control coefficient. When the pressure sensor detects a value greater than A, the control valve opens the vacuum generator to evacuate air until the air pressure returns to value A. When the spindle descends and the air pressure is less than the F value, the reversing valve is switched to allow the air compressor to replenish air to the A value; if the A value cannot be reached continuously, a grease leakage alarm is triggered; where F is a preset threshold.

2. The negative pressure sealing system for a single-cylinder hydraulic cone crusher boom according to claim 1, characterized in that, The system also includes an air compressor, one end of which is connected to the other end of the vacuum generator.

3. The negative pressure sealing system for a single-cylinder hydraulic cone crusher boom according to claim 1, characterized in that, The vacuum generator is connected to the air compressor via a high-pressure hose, and the pumping speed of the vacuum generator is adjustable.

4. The negative pressure sealing system for a single-cylinder hydraulic cone crusher boom according to claim 1, characterized in that, The clearance between the boom bushing and the main shaft is 0.05-0.1mm, and the inner surface of the bushing is provided with a spiral oil groove.

5. The negative pressure sealing system for a single-cylinder hydraulic cone crusher boom according to claim 1, characterized in that, The pressure sensor has a detection accuracy of no less than ±50Pa and a sampling frequency of ≥10Hz.

6. A negative pressure sealing system for the boom of a single-cylinder hydraulic cone crusher, characterized in that, The system also includes: It is located outside the boom, on the side of the main shaft, between the main shaft and the upper boom.

7. A negative pressure sealing system for the boom of a single-cylinder hydraulic cone crusher, characterized in that, The system also includes: The boom bushing is fitted onto the main shaft.

8. A negative pressure sealing method for a single-cylinder hydraulic cone crusher boom, comprising a negative pressure sealing system for a single-cylinder hydraulic cone crusher boom as described in any one of claims 1-7, characterized in that, Including the following steps: S1: Initialize the PLC control unit and set the initial values ​​of dynamic parameters α, β, and γ; S2: Automatically adjusts the α value based on the real-time detected grease condition; S3: The set dynamic air pressure threshold established and maintained by the vacuum generator; S4: When the spindle is oscillating, it automatically switches between air extraction / air replenishment modes based on pressure fluctuations.

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