A pulverizer cutter head oil injection structure

Abstract

The utility model discloses a kind of grinder cutter head oil injection structure, it is related to grinder cutter head oil injection technical field, including oil injection pipe, sliding cavity is built-in in oil injection pipe, sliding cavity is slidably equipped with sealing column and lower pressing disc, sealing column radial outer wall and buffering cavity inner radial side wall are tightly slidably attached, lower pressing disc is located above sealing column, the space between lower pressing disc and sealing column in sliding cavity is buffering cavity, and spring is equipped in buffering space, the space below sealing column in sliding cavity is oil storage cavity, lower pressing disc is located in sliding cavity Height adjustable setting, and then the spring elasticity of adjusting, and then adjust the oil injection pressure in oil storage cavity.The utility model is different for different model grinder, and the size of its oil injection port caliber is different, by adjusting the size of column oil pressure in oil storage cavity, meet the oil injection demand of grinder cutter head, while, the size of oil injection port caliber can be avoided too small, and pressure impact appears when oil injection pressure is big, and sealing element or lubricating oil pipe is damaged.

Description

Technical Field

[0001] This utility model relates to the field of oil injection technology for crusher cutter heads, specifically to an oil injection structure for crusher cutter heads. Background Technology

[0002] When the crusher blades rotate at high speeds (typically hundreds to thousands of revolutions per minute), they generate intense friction with materials, bearings, gears, and other components. The lubrication system delivers lubricating oil to key areas such as the blade bearings and gear meshing surfaces, forming an oil film that separates the directly contacting metal surfaces, significantly reducing the coefficient of friction and thus minimizing energy loss and wear. The lubricating oil also carries away the heat generated by friction, preventing the blades from deforming due to high temperatures or material fatigue. For example, an unlubricated blade bearing may only have a lifespan of a few hundred hours, while a fully lubricated one can extend it to thousands of hours.

[0003] However, most existing technologies employ high-pressure oil injection. Due to variations in the interface sizes of oil injection devices from different manufacturers, pressure surges can easily occur when the injection port diameter is too small, even with constant injection pressure. These pressure surges can damage seals, leading to lubricant leakage, and may even damage the lubrication pipes, affecting the normal operation of the entire oil injection system and consequently impacting the lubrication effect and service life of the crusher. Therefore, developing an oil injection structure for crusher cutters that can adapt to different injection port diameters and effectively adjust the injection pressure is of significant practical importance. Summary of the Invention

[0004] The purpose of this invention is to provide an oil injection structure for a crusher cutter head to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an oil injection structure for a crusher cutter head, including an oil injection pipe, wherein the oil injection pipe has a built-in sliding cavity, an external oil outlet port is connected to the bottom end of the oil injection pipe, and an oil injection extension pipe is connected to the external oil outlet port; an external flange for an oil inlet is connected to the bottom end of the outer wall of the oil injection pipe.

[0006] A sealing column and a pressure plate are slidably disposed within the sliding cavity. The outer radial wall of the sealing column is tightly slidably fitted with the inner radial side wall of the buffer cavity. The pressure plate is located above the sealing column. The space between the pressure plate and the sealing column within the sliding cavity is a buffer cavity, and a spring is disposed within the buffer space. The spring force presses the sealing column down in real time.

[0007] The space located below the sealing column within the sliding cavity is an oil storage cavity;

[0008] The lower pressure plate is located in the sliding cavity at an adjustable height, which in turn adjusts the spring force and thus the oil injection pressure in the oil storage cavity.

[0009] In a further embodiment, one end of the oil injection extension pipe is provided with a hollow threaded connection end, which is threadedly connected to an external oil outlet port.

[0010] The hollow threaded connection end is provided with an annular step, which is in close contact with the edge sidewall of the external oil outlet port.

[0011] In a further embodiment, the other end of the oil injection extension pipe is provided with a bent oil injection end.

[0012] In a further embodiment, a limiting rod is provided laterally on the radial sidewall of the sliding cavity. The limiting rod is located below the sealing column and is positioned above the plane where the external flange of the oil inlet is located.

[0013] In a further embodiment, a threaded rod is fixed to the upper end face of the pressure plate, a threaded hole is opened at the upper end of the oil injection pipe, the upper end of the threaded rod passes through the threaded hole and extends to the top of the oil injection pipe, and an operating disc is fixed thereon.

[0014] In a further embodiment, the inner top wall of the sliding cavity is provided with a rubber sleeve that covers the outer wall of the threaded rod.

[0015] In a further embodiment, the outer radial wall of the sealing column is wrapped with a rubber sleeve, which is in close contact with the inner radial sidewall of the sliding cavity.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This utility model relates to an oil injection structure for a crusher cutter head. The diameter of the oil injection port varies for different models of crushers. By adjusting the oil pressure in the oil storage cavity, the oil injection requirements of the crusher cutter head can be met, while avoiding pressure shock caused by an excessively small oil injection port diameter and high oil injection pressure, which could damage the seals or lubrication pipes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the internal structure of the oil injection pipe according to an embodiment of the present utility model;

[0020] Figure 3 This is a cross-sectional view of the oil injection extension pipe structure according to an embodiment of the present utility model.

[0021] In the diagram: 1. Oil injection pipe; 11. Threaded rod; 12. Lower pressure plate; 13. Rubber sleeve; 14. Spring; 15. Sealing column; 16. Limiting rod; 2. Oil drum; 3. Negative pressure oil pump; 4. Oil injection extension pipe; 41. Hollow threaded connection end; 42. Annular ladder. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This embodiment provides an oil injection structure for a crusher cutter head, such as... Figure 1 and Figure 3 As shown, the device includes an oil injection pipe 1 with a built-in sliding cavity. An external oil outlet port is connected to the bottom end of the oil injection pipe 1, and an oil injection extension pipe 4 is connected to the external oil outlet port. One end of the oil injection extension pipe 4 has a hollow threaded connection end 41, which is threadedly connected to the external oil outlet port. An annular trapezoidal platform 42 is provided inside the hollow threaded connection end 41, and the annular trapezoidal platform 42 is in close contact with the edge sidewall of the external oil outlet port to prevent oil leakage due to gaps at the connection between the external oil outlet port and the hollow threaded connection end 41 during oil injection. The other end of the oil injection extension pipe 4 has a bent oil injection end. The bent oil injection end allows for easy and flexible insertion of the end of the oil injection extension pipe 4 into the oil injection port of the crusher cutter head for oil injection.

[0024] The bottom of the outer wall of the oil injection pipe 1 is connected to an external flange for the oil inlet. The external flange for the oil inlet is connected to a negative pressure oil pump 3 via an oil delivery pipe. The negative pressure oil pump 3 is connected to an oil tank 2 via an oil delivery pipe. The oil tank 2 contains lubricating oil. The negative pressure provided by the negative pressure oil pump 3 draws the lubricating oil from the oil tank 2 and introduces it into the oil injection pipe 1. The lubricating oil then enters the oil injection extension pipe 4 from the external oil outlet port and is finally injected into the oil injection port of the crusher cutter head.

[0025] Because different models of crusher blades have different oil inlet diameters, it's important to avoid situations where the oil inlet diameter is too small. Otherwise, under constant oil pressure, excessive pressure can easily cause pressure surges, damaging seals or lubrication lines. For example... Figure 2 and Figure 3As shown, a sealing column 15 and a lower pressure plate 12 are slidably disposed within the sliding cavity. A threaded rod 11 is fixed to the upper end face of the lower pressure plate 12. A threaded hole is opened at the upper end of the oil injection pipe 1. The upper end of the threaded rod 11 passes through the threaded hole and extends above the oil injection pipe 1, where an operating disc is fixed. By rotating the operating disc, the threaded rod 11 can be moved up and down within the threaded hole, thereby adjusting the height of the lower pressure plate 12 within the sliding cavity. The radial outer wall of the sealing column 15 is tightly slidably fitted with the radial side wall of the buffer cavity. The lower pressure plate 12 is located above the sealing column 15. The space between the lower pressure plate 12 and the sealing column 15 within the sliding cavity is a buffer cavity, and a spring 14 is disposed within the buffer space. The elastic force of the spring 14 presses the sealing column 15 down in real time. This adjustment method is simple and easy to operate, and can precisely control the position of the lower pressure plate 12, thereby achieving adjustment of the elastic force of the spring 14.

[0026] The space below the sealing column 15 within the sliding cavity is an oil storage cavity. To further enhance the sealing performance, a rubber gasket is wrapped around the radial outer wall of the sealing column 15. The rubber gasket is in close contact with the radial sidewall of the sliding cavity, and the sealing performance between the sealing column 15 and the radial sidewall of the sliding cavity is enhanced by the sealing performance of the rubber gasket. In this way, lubricating oil is prevented from entering the oil storage cavity and then overflowing into the buffer cavity through the gap between the sealing column 15 and the sliding cavity.

[0027] The height of the lower pressure plate 12 located in the sliding cavity is adjustable, thereby adjusting the elastic force of the spring 14 and thus adjusting the oil injection pressure in the oil storage cavity.

[0028] Specifically, Hooke's Law states: F = kx, where F is the spring force of spring 14, k is the spring constant of spring 14, and x is the deformation of spring 14. With the spring constant k remaining constant: when the buffer space decreases, it means that spring 14 is further compressed, and the deformation x of spring 14 increases. Since k remains constant, the increase in x leads to an increase in the spring force F of spring 14. This increased force will continuously press down the sealing column 15.

[0029] Increasing the oil injection pressure: When it is necessary to increase the oil injection pressure, rotate the operating disc to move the threaded rod 11 downwards, which in turn moves the lower pressure plate 12 downwards, reducing the buffer space. When the buffer space decreases, the compression x of the spring 14 increases (because the height adjustment of the lower pressure plate 12 causes the spring 14 to be further compressed). According to Hooke's Law, the elastic force F_elastic = kx will increase synchronously. Since F_pressure = F_elastic, the pressure on the sealing column 15 will inevitably increase. This increased elastic force will press the sealing column 15 downwards in real time, increasing the pressure on the sealing column 15. This means that the space inside the oil storage cavity decreases. Under the condition that the oil supply pressure of the negative pressure oil pump 3 remains unchanged, the pressure of the lubricating oil discharged from the end of the oil injection extension pipe 4 is greater to meet the lubricating oil injection requirements. For example, this is used in some large crusher blades or oil injection port diameters with high requirements for lubricating oil flow and pressure.

[0030] Reducing oil injection pressure: If the oil injection port diameter of the crusher cutter head is small, to avoid pressure shocks caused by excessive oil injection pressure, which could damage seals or lubrication pipes, the buffer space needs to be increased to reduce the oil injection pressure. In this case, rotating the operating disc in the reverse direction moves the threaded rod 11 upwards, causing the lower pressure plate 12 to move upwards, thus increasing the buffer space. This reduces the compression of the spring 14 (x), resulting in a smaller pressure value of the sealing column 15. With the oil supply pressure of the negative pressure oil pump 3 remaining constant, the space within the oil storage cavity will be pushed upwards by the injection of high-pressure oil, causing the sealing column 15 to spring up and increasing the oil storage space. This reduces the oil injection pressure, meeting the oil injection needs of the crusher cutter head with a small oil injection port diameter. This avoids pressure shocks caused by excessively small oil injection port diameter and high oil injection pressure, which could damage seals or lubrication pipes.

[0031] Meanwhile, a rubber sleeve 13 is provided on the top wall of the sliding cavity, which is fitted onto the outer wall of the threaded rod 11. This prevents gaps between the threaded rod 11 and the threaded groove, which could allow dust to enter the sliding cavity. The entry of dust could increase the resistance of the sealing column 15 sliding up and down along the radial side wall of the sliding cavity, affecting the normal operation of the oil injection structure. The rubber sleeve 13 effectively ensures the stability and reliability of the oil injection structure.

[0032] In this embodiment, to prevent the sealing column 15 from sliding to its lowest position along the sliding cavity, the radial outer wall of the sealing column 15 blocks the junction of the oil injection pipe 1 and the external flange of the oil inlet, thus affecting oil intake. Figure 2 As shown, a limiting rod 16 is provided laterally on the radial sidewall inside the sliding cavity. The limiting rod 16 is located below the sealing column 15 and is positioned above the plane where the external flange of the oil inlet is located. In this way, when the sealing column 15 slides down the sliding cavity to the lowest point, it is located on the upper end face of the limiting rod 16, which will not affect the normal oil intake into the oil storage cavity.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulverizer cutter head oil injection structure, characterized in that, include: Oil injection pipe (1), the oil injection pipe (1) has a built-in sliding cavity, the bottom end of the oil injection pipe (1) is connected to an external oil outlet port, the external oil outlet port is connected to an oil injection extension pipe (4); the bottom end of the outer wall of the oil injection pipe (1) is connected to an external oil inlet flange. A sealing column (15) and a lower pressure plate (12) are slidably arranged in the sliding cavity. The outer radial wall of the sealing column (15) is tightly slidably attached to the radial side wall of the buffer cavity. The lower pressure plate (12) is located above the sealing column (15). The space between the lower pressure plate (12) and the sealing column (15) in the sliding cavity is a buffer cavity, and a spring (14) is provided in the buffer space. The elastic force of the spring (14) will press the sealing column (15) down in real time. The space below the sealing column (15) within the sliding cavity is an oil storage cavity; The height of the lower pressure plate (12) in the sliding cavity is adjustable, thereby adjusting the elastic force of the spring (14) and thus adjusting the oil injection pressure in the oil storage cavity.

2. The oil injection structure for the crusher cutter head according to claim 1, characterized in that, One end of the oil injection extension pipe (4) is provided with a hollow threaded connection end (41), which is threadedly connected to the external oil outlet port. The hollow threaded connection end (41) is provided with an annular step (42), and the annular step (42) is in close contact with the edge sidewall of the external oil outlet port.

3. The oil injection structure for the crusher cutter head according to claim 2, characterized in that, The other end of the oil injection extension pipe (4) is provided with a bent oil injection end.

4. The oil injection structure for the crusher cutter head according to claim 1, characterized in that, The sliding cavity has a limiting rod (16) on its radial sidewall. The limiting rod (16) is located below the sealing column (15) and is located on the upper side of the plane where the oil inlet flange is located.

5. The oil injection structure for the crusher cutter head according to claim 1, characterized in that, The upper end face of the pressure plate (12) is fixed with a threaded rod (11), and the upper end of the oil injection pipe (1) is provided with a threaded hole. The upper end of the threaded rod (11) passes through the threaded hole and extends to the top of the oil injection pipe (1), and is fixed with an operating plate.

6. The oil injection structure for the crusher cutter head according to claim 5, characterized in that, The inner top wall of the sliding cavity is provided with a rubber sleeve (13) that is fitted onto the outer wall of the threaded rod (11).

7. The oil injection structure for the crusher cutter head according to claim 1, characterized in that, The outer radial wall of the sealing column (15) is wrapped with a rubber gasket, which is in close contact with the inner radial side wall of the sliding cavity.

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