Independent backpressure system of vertical roller mill

Abstract

The utility model relates to the field of backpressure systems of vertical roller mills, in particular to an independent backpressure system of a vertical roller mill, which comprises an oil tank, an oil pump station, a main hydraulic oil cylinder, a backpressure hydraulic oil cylinder, a rocker arm and an energy accumulator, the main hydraulic oil cylinder is provided with a main hydraulic oil cylinder oil inlet and an oil outlet which are respectively connected with the oil tank and the oil pump station; a backpressure hydraulic oil cylinder oil inlet and a backpressure hydraulic oil cylinder oil outlet are formed in the backpressure hydraulic oil cylinder, the backpressure hydraulic oil cylinder oil inlet is connected with an oil tank, and the backpressure hydraulic oil cylinder oil outlet is connected with an energy accumulator and an oil pump station. In the operation process, the main hydraulic oil cylinder and the backpressure hydraulic oil cylinder can jointly divide pressure, the energy accumulator can directly control the backpressure hydraulic oil cylinder, the pressure range borne by the backpressure system can be enlarged through the design, the backpressure system can be applied to more scenes, the loss of a leather bag in the energy accumulator can be reduced, and the service life of the backpressure system is prolonged. And the service life of the backpressure system is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of back pressure systems for vertical roller mills, and particularly to an independent back pressure system for vertical roller mills. Background Technique

[0002] Vertical roller mill equipment is widely used in the fields of raw meal grinding and pulverized coal preparation. Materials enter the center of the grinding table of the mill through the feeding device, are rolled and crushed, sorted according to the particle size of the crushed materials, the finished products that meet the fineness requirements are collected as finished products, and the coarse particles that do not meet the requirements fall back onto the grinding table and are ground again.

[0003] During the operation of vertical roller mill equipment, fluctuations and impacts will occur between materials and between materials and the equipment. The back pressure system in the vertical roller mill equipment can maintain the system of the vertical roller mill equipment to operate more smoothly. When the external load suddenly becomes smaller and reduces to zero, the back pressure system can play a buffering role for the entire system, avoiding equipment damage or instability caused by sudden changes in load.

[0004] The back pressure system in the vertical roller mill equipment consists of pipelines and a back pressure accumulator. When the external load suddenly decreases, the pressure in the system will increase within a short period of time. At this time, the back pressure accumulator will absorb this part of the excess pressure energy and store it. When the load increases again, the stored pressure energy is released, thus playing a buffering role and making the change of the system pressure relatively gentle.

[0005] Currently, the load pressure range during the operation of the back pressure system is 2 - 3.5 Mpa. The back pressure accumulator contains a bladder filled with nitrogen at a certain pressure, which can play a buffering and energy storage role. Generally, the maximum pressure that the bladder filled with nitrogen in the back pressure accumulator can withstand is about 60% - 70% of the working pressure, that is, about 1.2 Mpa - 2.5 Mpa.

[0006] However, under such working pressures, the service life of the inflated bladder in the back pressure accumulator is relatively low. Once the bladder is damaged, the accumulator will lose its energy storage and buffering functions, and the back pressure system will not be able to work properly.

[0007] In the back pressure system, a mechanical buffer device also needs to be designed at the end of the equipment to cooperate with the back pressure energy accumulator to relieve the pressure in the rodless cavity of the back pressure system. However, the function of this mechanical buffer device is realized by relying on a set of disc springs and guide rods and cannot be adjusted according to the buffer pressure.

[0008] In a traditional backpressure system, through the synergistic effect of various methods, the stable operation of the vertical roller mill is guaranteed to a certain extent. However, the load pressure range of the traditional backpressure system is difficult to adapt to a higher operating environment, which limits its use. Moreover, the service life of the traditional backpressure system is short. If the overall backpressure system is improved, the operating cost will increase. Therefore, there is an urgent need for a backpressure system that is easy to use and can achieve the purpose of expanding the load pressure conditions of the backpressure system through simple adjustment. On this premise, it can also reduce the loss of the inflatable bladder in the backpressure accumulator and extend the service life of the bladder, thereby prolonging the service life of the backpressure system. Summary of the Invention

[0009] To solve the problems mentioned in the background art and overcome the above deficiencies, the present utility model provides the following technical solutions:

[0010] An independent backpressure system for a vertical roller mill includes an oil inlet pipe, an oil outlet pipe, a main hydraulic cylinder, a backpressure hydraulic cylinder, a rocker arm, and an accumulator. By controlling and adjusting the pressure given by the accumulator to the independent backpressure hydraulic cylinder, the use of the backpressure system in different pressure environments is realized; different from the traditional backpressure system, the backpressure hydraulic cylinder is independently installed and independently controlled from the main hydraulic cylinder, and the two do not affect each other.

[0011] The fuel tank is connected to an external oil tank through a pipeline, and a pump station is also provided on the top of the fuel tank;

[0012] The main hydraulic cylinder and the backpressure hydraulic cylinder are respectively provided with different oil inlets and oil outlets, enabling hydraulic oil to flow separately in the main hydraulic cylinder and the backpressure hydraulic cylinder;

[0013] The main hydraulic cylinder is provided with a rod chamber of the main hydraulic cylinder and a rodless chamber of the main hydraulic cylinder from top to bottom. The rod chamber of the main hydraulic cylinder is connected to the rocker arm; the rod chamber of the main hydraulic cylinder is connected to the pump station, and the rodless chamber of the main hydraulic cylinder is connected to the fuel tank;

[0014] Further, an oil outlet of the main hydraulic cylinder is provided in the rod chamber of the main hydraulic cylinder, and an oil inlet of the main hydraulic cylinder is provided in the rodless chamber of the main hydraulic cylinder;

[0015] Further, the oil inlet of the main hydraulic cylinder is connected to the fuel tank through an oil inlet pipe of the main hydraulic cylinder; the oil outlet of the main hydraulic cylinder is connected to the pump station through an oil outlet pipe of the main hydraulic cylinder.

[0016] The backpressure hydraulic cylinder is respectively provided with a rod chamber of the backpressure hydraulic cylinder and a rodless chamber of the backpressure hydraulic cylinder. The rodless chamber of the backpressure hydraulic cylinder and the rod chamber of the backpressure hydraulic cylinder are arranged horizontally from left to right;

[0017] A back-pressure hydraulic cylinder is provided with a back-pressure hydraulic cylinder oil inlet on its rod chamber, and a back-pressure hydraulic cylinder oil outlet on its rodless chamber;

[0018] The back-pressure hydraulic cylinder oil inlet is connected to the fuel tank through a back-pressure hydraulic cylinder inlet pipe;

[0019] Further, after the back-pressure hydraulic cylinder inlet pipe is connected to the main hydraulic cylinder inlet pipe, the back-pressure hydraulic cylinder inlet pipe is then connected to the fuel tank, so as to achieve the purpose of connecting the rodless chamber inlet pipe of the main hydraulic cylinder to the fuel tank;

[0020] The back-pressure hydraulic cylinder oil outlet is connected to an accumulator and an oil pump station through a back-pressure hydraulic cylinder outlet pipe;

[0021] Further, the accumulator is arranged between the back-pressure hydraulic cylinder oil outlet and the oil pump station;

[0022] The back-pressure hydraulic cylinder body is fixed to a back-pressure hydraulic cylinder fixed support through a back-pressure hydraulic cylinder fixed pin shaft, and the back-pressure hydraulic cylinder fixed support is fixedly connected to the vertical mill frame;

[0023] The tail of the rod chamber of the back-pressure hydraulic cylinder is further connected with a piston rod, and the piston rod is connected with a rocker arm;

[0024] Further, the piston rod is fixedly connected to one end of a piston rod connection support through a piston rod fixed pin shaft; the other end of the piston rod connection support is connected to the rocker arm;

[0025] The accumulator is provided with a bladder. When the back-pressure hydraulic cylinder is operating, the accumulator is in an inflated state, and at this moment, the bladder is used to share the pressure of the accumulator.

[0026] Through such a design, the back-pressure of the main hydraulic cylinder is cancelled, and the back-pressure hydraulic cylinder and the main hydraulic cylinder in the back-pressure system are separated. Each is respectively provided with an oil inlet, an oil outlet, as well as an inlet pipe and an outlet pipe, so that the back-pressure hydraulic cylinder and the main hydraulic cylinder are respectively connected to the fuel tank and the oil pump station, and the back-pressure hydraulic cylinder and the main hydraulic cylinder are relatively independently arranged.

[0027] When the back-pressure system is operating, the piston of the back-pressure hydraulic cylinder reciprocates, so that the hydraulic oil in the rodless chamber of the back-pressure hydraulic cylinder flows freely between the back-pressure hydraulic cylinder and the fuel tank, and the freedom of movement of the piston is guaranteed.

[0028] After the back-pressure hydraulic cylinder becomes independent, it can not only completely replace the original mechanical buffer device, but also work at a higher pressure by using an accumulator. Even after the accumulator is inflated, the bladder still only bears 60%-70% of the pressure. Within this pressure range, the bladder of the accumulator can maintain a good elastic state;

[0029] However, the back-pressure hydraulic cylinder can work under a pressure of 8 Mpa to 13 Mpa. Under such conditions, the pressure range that the bladder of the accumulator can bear can be increased to 4.8 Mpa to 9.1 Mpa. The increase in the pressure that the back-pressure hydraulic cylinder can bear means that the pressure that the back-pressure system can bear also increases. The bladder of the accumulator can not only bear more pressure, but also maintain the elasticity of the bladder and extend the service life of the bladder.

[0030] For the back-pressure system, it can also be uniformly regulated in the central control room, and the requirement for the equipment to work in different pressure ranges can be realized through simple operations. Coupled with the innovative design of key components such as the back-pressure hydraulic cylinder, valves, and sensing systems, the stability and durability of the back-pressure system can be improved.

[0031] Compared with the prior art, the beneficial effects of the present utility model are:

[0032] By improving the back-pressure system of the traditional vertical roller mill, the back-pressure hydraulic cylinder originally connected to the main hydraulic cylinder is separated, so that the back-pressure hydraulic cylinder connected to the main hydraulic cylinder becomes two independent complete bodies, and both can operate under the drive of the oil tank and the oil pump station. Such a design can simultaneously keep the back-pressure hydraulic cylinder connected to the main hydraulic cylinder under high pressure, increase the maximum pressure range that the back-pressure system can bear, and after the back-pressure hydraulic cylinder is set up separately, the accumulator can separately regulate the back-pressure hydraulic cylinder, and can more accurately regulate the pressure value borne by the back-pressure hydraulic cylinder, which can improve production efficiency, and at the same time can reduce the loss of the bladder after inflation in the accumulator and extend the service life of the accumulator. Brief Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the overall structure of the independent back-pressure system of the vertical roller mill of the present utility model;

[0034] Figure 2 It is a schematic diagram of the structure of the back-pressure hydraulic cylinder in the independent back-pressure system of the vertical roller mill of the present utility model;

[0035] 1 - Fuel tank, 2 - Oil pump station, 3 - Accumulator, 4 - Main hydraulic cylinder inlet pipe, 5 - Main hydraulic cylinder outlet pipe, 6 - Rocker arm, 7 - Back pressure hydraulic cylinder outlet pipe, 8 - Back pressure hydraulic cylinder inlet pipe, 9 - Back pressure hydraulic cylinder fixed support, 10 - Back pressure hydraulic cylinder, 11 - Back pressure hydraulic cylinder fixed pin shaft, 12 - Back pressure hydraulic cylinder fixed support spacer ring, 13 - Piston rod connection support, 14 - Piston rod fixed pin shaft, 15 - Piston rod connection support spacer ring. Detailed implementation mode

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present invention.

[0037] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0038] Embodiment 1

[0039] In a traditional vertical roller press, the back pressure hydraulic cylinder 10 of the back pressure system is connected to the main hydraulic cylinder. The main hydraulic cylinder inlet pipe 4 and the main hydraulic cylinder outlet pipe 5 respectively connect the inlet and outlet of the main hydraulic cylinder to the fuel tank 1 and the oil pump station 2. When the back pressure system works, the oil pump station 2 sucks oil from the fuel tank 1 and pressurizes the back pressure system. The rod chamber of the main hydraulic cylinder is in a high-pressure state. The rocker arm 6 is used to drive the piston of the back pressure hydraulic cylinder 10 to move, so as to control the accumulator 3 to work. Since only the main hydraulic cylinder is in a high-pressure state at this time, the pressure range that can be borne is limited. The air-filled bladder of the accumulator 3 must always be in a high-pressure state, and the traditional back pressure system can maintain stability. Such a design not only limits the upper limit of the environmental pressure when the back pressure system works, but also the accumulator 3 is the main pressure-bearing component, and the process of inflating and decompressing needs to be carried out continuously, which causes great loss to the bladder inside. Once the bladder is damaged, it is difficult to replace, and it will also increase the operating cost.

[0040] The structure of an independent back pressure system for a vertical roller mill in this application is as Figure 1As shown in the figure, in the back pressure system, the main hydraulic cylinder and the back pressure hydraulic cylinder 10 are separated into two separate parts. During operation, the oil pump station 2 sucks oil from the oil tank 1. When pressurizing the back pressure system, the rod chamber of the main hydraulic cylinder and the back pressure hydraulic cylinder 10 are both in a high-pressure state simultaneously. Such a design can not only increase the upper limit of the maximum pressure that the back pressure system can withstand, but also, since the pressure is distributed, the accumulator 3 only needs to adjust the pressure-bearing state of the back pressure hydraulic cylinder 10 alone, reducing the loss of the bladder in the accumulator 3.

[0041] Specifically, the main hydraulic cylinder is composed of a rod chamber of the main hydraulic cylinder and a rodless chamber of the main hydraulic cylinder from top to bottom. An oil outlet is provided on the rod chamber of the main hydraulic cylinder and is connected to the oil pump station 2 through the main hydraulic cylinder oil outlet pipe 5; an oil inlet is provided on the rodless chamber of the main hydraulic cylinder and is connected to the oil tank 1 through the main hydraulic cylinder oil inlet pipe 4.

[0042] During the operation process, the main hydraulic cylinder oil inlet pipe 4 is controlled by the oil tank 1, and the main hydraulic cylinder oil outlet pipe 5 is controlled by the oil pump station 2, and they cooperate with the rocker arm 6 for movement.

[0043] On the back pressure hydraulic cylinder 10, a rodless chamber of the back pressure hydraulic cylinder and a rod chamber of the back pressure hydraulic cylinder are arranged horizontally from left to right, and a piston rod is also connected to the tail of the back pressure hydraulic cylinder 10.

[0044] Combined Figure 2 As shown in the figure, the cylinder body of the back pressure hydraulic cylinder 10 is fixed on the back pressure hydraulic cylinder fixed support 9 through the back pressure hydraulic cylinder fixed pin 11 and the back pressure hydraulic cylinder fixed support spacer ring 12, and the back pressure hydraulic cylinder fixed support 9 is fixedly connected to the vertical mill frame; the piston rod connected to the tail of the back pressure hydraulic cylinder is fixedly connected to one end of the piston rod connecting support 13 through the piston rod fixed pin 14 and the piston rod connecting support spacer ring 15, and the other end of the piston rod connecting support 13 is connected to the rocker arm 6.

[0045] A back pressure hydraulic cylinder oil inlet is provided on the rod chamber of the back pressure hydraulic cylinder, and the back pressure hydraulic cylinder oil inlet is connected to the oil tank 1 through the back pressure hydraulic cylinder oil inlet pipe 8 with a back pressure;

[0046] A back pressure hydraulic cylinder oil outlet is provided on the rodless chamber of the back pressure hydraulic cylinder, and the oil outlet of the rodless chamber of the back pressure hydraulic cylinder is connected to the accumulator 3 and the oil pump station 2 through the back pressure hydraulic cylinder oil outlet pipe 7.

[0047] The main hydraulic cylinder oil inlet pipe 4 can be connected to the back pressure hydraulic cylinder oil inlet through the back pressure hydraulic cylinder oil inlet pipe 8 with a back pressure, and then communicate with the oil tank 1.

[0048] During the operation process, energy is supplied to the accumulator 3 by the fuel tank 1 and the oil pump station 2. By inflating the accumulator 3, the bladder in the accumulator 3 is used to supply energy to the backpressure hydraulic cylinder 10. The backpressure hydraulic cylinder 10 can control the swing amplitude of the rocker arm 6 by using the force generated by the flow of hydraulic oil in the backpressure hydraulic cylinder outlet pipe 7 and the backpressure hydraulic cylinder inlet pipe 8 through the central control system, so as to control the backpressure system.

[0049] During the operation process, the main hydraulic cylinder and the backpressure hydraulic cylinder 10 are pressurized simultaneously, which can increase the upper pressure limit of the backpressure system, improve the stability of the equipment and the production efficiency. Compared with the traditional backpressure system, it can achieve the effect of sharing pressure simultaneously in two ways. At the same time, since the accumulator is directly connected to the backpressure hydraulic cylinder outlet pipe 7, the backpressure hydraulic cylinder 10 can be directly regulated, reducing the loss of the bladder in the accumulator 3 and extending the service life of the accumulator 3, thereby extending the service life of the backpressure system.

[0050] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An independent backpressure system for a vertical roller mill, comprising an oil tank (1), an oil pump station (2), a main hydraulic cylinder, a backpressure hydraulic cylinder (10), a rocker arm (6), and an accumulator (3). The main hydraulic cylinder and the backpressure hydraulic cylinder (10) are both connected to the rocker arm (6), and it is characterized in that: The main hydraulic cylinder is provided with a main hydraulic cylinder oil inlet and a main hydraulic cylinder oil outlet. The main hydraulic cylinder oil inlet is connected to the fuel tank (1) through a main hydraulic cylinder inlet pipe (4), and the main hydraulic cylinder oil outlet is connected to the oil pump station (2) through a main hydraulic cylinder outlet pipe (5); the back pressure hydraulic cylinder (10) is provided with a back pressure hydraulic cylinder oil inlet and a back pressure hydraulic cylinder oil outlet. The back pressure hydraulic cylinder oil inlet is connected to the fuel tank (1) through a back pressure hydraulic cylinder inlet pipe (8), and the back pressure hydraulic cylinder oil outlet is connected to the accumulator (3) and the oil pump station (2) through a back pressure hydraulic cylinder outlet pipe (7).

2. The independent back pressure system of a vertical roller mill according to claim 1, characterized in that: The main hydraulic cylinder inlet pipe (4) is connected to the back pressure hydraulic cylinder inlet pipe (8), and the back pressure hydraulic cylinder inlet pipe (8) is further connected to the fuel tank (1).

3. The independent back pressure system of a vertical roller mill according to claim 1, wherein: The back pressure hydraulic cylinder (10) is provided with a back pressure hydraulic cylinder rod chamber and a back pressure hydraulic cylinder rodless chamber. The back pressure hydraulic cylinder rodless chamber and the back pressure hydraulic cylinder rod chamber are arranged horizontally from left to right. A piston rod is also connected to the tail of the back pressure hydraulic cylinder rod chamber, and the piston rod is connected to the swing arm (6).

4. The independent back pressure system of a vertical roller mill according to claim 3, characterized in that: The back pressure hydraulic cylinder oil inlet is arranged on the back pressure hydraulic cylinder rod chamber, and the back pressure hydraulic cylinder oil outlet is arranged on the back pressure hydraulic cylinder rodless chamber.

5. The independent back pressure system of a vertical roller mill according to claim 1 or 4, characterized in that: An accumulator (3) is provided between the back pressure hydraulic cylinder oil outlet and the oil pump station (2).

6. The vertical roller mill independent back pressure system according to claim 1, characterized in that: The main hydraulic cylinder is respectively provided with a main hydraulic cylinder rod chamber and a main hydraulic cylinder rodless chamber from top to bottom. The tail of the main hydraulic cylinder rod chamber is connected to the swing arm (6); the main hydraulic cylinder oil outlet is arranged on the main hydraulic cylinder rod chamber, and the main hydraulic cylinder oil inlet is arranged on the main hydraulic cylinder rodless chamber.

7. The independent back pressure system of a vertical roller mill according to claim 1, characterized in that: The cylinder body of the back pressure hydraulic cylinder (10) is fixed on the back pressure hydraulic cylinder fixed support (9) through a back pressure hydraulic cylinder fixed pin shaft (11), and the back pressure hydraulic cylinder fixed support (9) is fixedly connected to the vertical mill frame.

8. The independent backpressure system of a vertical roller mill according to claim 3, characterized in that: The piston rod is fixedly connected to one end of the piston rod connection support (13) through a piston rod fixed pin shaft (14); the other end of the piston rod connection support (13) is connected to the swing arm (6).

Images