Multi-stage dry pulverizer

Abstract

The utility model relates to a multi-stage dry type pulverizer, which belongs to the field of pulverizing equipment and comprises a shell and a plurality of crushing cavities arranged in the shell, the crushing cavities are arranged along the horizontal direction, adjacent crushing cavities are communicated with each other, crushing rotors are arranged in the crushing cavities, the shell comprises a lower shell and an upper cover, and the upper cover is arranged on the lower shell. The upper cover body comprises a left side machine cover and a right side machine cover, and the left side machine cover and the right side machine cover are rotationally connected to the two ends of the lower shell respectively and are controlled by corresponding driving mechanisms to be opened and closed with the lower shell; the driving mechanism is an inclined linear telescopic mechanism, one end of the driving mechanism is hinged to the outer side of the lower shell, and the other end of the driving mechanism is hinged to the outer side of the left hood or the right hood. According to the utility model, parts in the shell can be maintained after the two cover bodies which are rotatably opened and closed are opened, so that the maintenance time is saved, and the influence on normal production is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of grinding equipment, specifically relating to a multi-stage dry grinding mill. Background Technology

[0002] In existing technologies, multi-stage dry grinding mills (such as CN105597871A) typically consist of a shell, multiple crushing chambers arranged sequentially within the shell, and crushing rotors within the crushing chambers. The shell comprises a lower shell and an upper shell, with mating flanges along the lower edge of the upper shell and the upper edge of the lower shell, fixed together by bolts. Several inspection ports are provided on the side of the upper shell for easy maintenance and repair of internal components. However, the liners, wear-resistant plates, and other structures installed in the crushing chambers, as well as the crushing rotor, require maintenance, repair, or replacement after a period of use. The limited operating space provided by the inspection ports on the shell means that when normal operation is difficult to complete through the inspection ports, the entire upper shell must be lifted, which takes considerable time and disrupts normal production. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-stage dry grinding mill with an improved shell structure, which allows the upper shell to be opened and closed, thereby facilitating the maintenance and repair of the internal components, saving maintenance time, and reducing the impact on normal production.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-stage dry grinding mill, comprising a shell and a crushing chamber disposed within the shell, wherein multiple crushing chambers are disposed and arranged in a horizontal direction, adjacent crushing chambers are interconnected, and a crushing rotor is disposed within the crushing chamber; the shell comprises a lower shell and an upper cover, the upper cover comprising a left cover and a right cover, the left cover and the right cover being rotatably connected to the two ends of the lower shell respectively, and opening and closing with the lower shell under the control of a corresponding drive mechanism; the drive mechanism is an inclined linear telescopic mechanism, one end of which is hinged to the outer side of the lower shell, and the other end is hinged to the outer side of the left cover or the right cover.

[0005] Specifically, the linear telescopic mechanism is a hydraulic cylinder or an electric cylinder.

[0006] In one embodiment, the crushing rotor in the crushing chamber includes a main shaft. Both ends of the main shaft extend out of the lower housing and are supported on bearings in the bearing housing. One end of the main shaft is the power input end. The power input end of the main shaft of each crushing rotor is connected to the corresponding motor through a transmission mechanism.

[0007] Furthermore, the power input ends of the main shafts of all crushing rotors are arranged alternately on opposite sides.

[0008] Furthermore, the transmission mechanism is a belt drive mechanism or a chain drive mechanism.

[0009] As one embodiment, the multi-stage dry grinding mill also includes a lubrication system, which includes an oil supply device, an oil inlet pipe, and an oil return pipe. The oil inlet pipe includes a first oil inlet hose, an oil inlet distribution pipe, and a second oil inlet hose connected in sequence. The first oil inlet hose is connected to the oil supply port of the oil supply device. The number of second oil inlet hoses is the same as the number of bearing seats on one side of the casing, and they are used to connect the oil inlet distribution pipe and the oil inlet of the bearing seat. The oil return pipe includes a first oil return hose, an oil return collection pipe, and a second oil return hose connected in sequence. The first oil return pipe is connected to the oil return port of the oil supply device. The number of second oil return hoses is the same as the number of bearing seats on one side of the casing, and they are used to connect the oil outlet of the bearing seat and the oil return collection pipe.

[0010] In one implementation, a discharge port is provided at the bottom of each crushing chamber, and a discharge valve is installed at the discharge port. A belt conveyor is provided below the discharge port.

[0011] Furthermore, the belt conveyor is equipped with a dust cover, the discharge port is connected to the inside of the dust cover, and one end of the dust cover is connected to a discharge suction pipe.

[0012] As one implementation, a feed hopper is provided on the top of the left or right side of the machine cover. The feed hopper is located above and connected to the primary crushing chamber. One side of the upper port of the feed hopper is open, and the other side is a closed opening formed by a cover plate. A feed suction pipe is connected to the closed opening.

[0013] Furthermore, the feed hopper is provided with multiple baffles arranged alternately from left to right. The baffles are inclined downwards, with the uppermost baffle located between the closed opening and the open opening, and extending inclinedly toward the open opening.

[0014] The beneficial effects of this utility model are: the upper shell of this utility model adopts an openable cover, which is controlled by a corresponding opening cylinder. After opening, it can provide sufficient operating space, which facilitates the maintenance, upkeep or replacement of the components inside the shell, such as the lining plate and wear-resistant plate installed in the crushing chamber, as well as the crushing rotor. This greatly improves the convenience of maintenance, saves maintenance time and reduces the impact on normal production.

[0015] The lubrication system used in this invention can fully lubricate and cool the bearing housing of each crushing rotor, ensuring the good working condition of the crushing rotor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the grinding mill body in this utility model;

[0019] Figure 3 This is a transverse view of the main body of the grinding mill in this utility model;

[0020] Markings in the diagram: 101, Left side cover; 102, Right side cover; 103, Lower housing; 2, Feed hopper; 201, Open opening; 202, Closed opening; 3, Feed suction pipe; 4, Opening cylinder; 5, Hydraulic pump station; 6, Oil supply device; 601, Lubricating oil tank; 602, Motor oil pump; 603, Cooler; 604, Filter; 605, Oil inlet; 606, Oil return port; 701, First oil inlet hose; 702, Oil distribution pipe; 703, Second oil inlet hose; 801, First oil return hose; 802, Oil return collection pipe. 803. Second return oil hose; 9. Dust cover; 10. Discharge dust suction pipe; 11. Belt conveyor; 12. Frame; 13. Lower hinge seat; 14. Upper hinge seat; 15. Arc-shaped support plate; 1601. Primary crushing chamber; 1602. Secondary crushing chamber; 1603. Tertiary crushing chamber; 1604. Quaternary crushing chamber; 17. Wear-resistant liner; 18. Discharge port; 19. Discharge valve; 20. Crushing rotor; 21. Arc-shaped liner; 22. Baffle plate; 23. Bearing; 24. Driven pulley; 25. Driven pulley; 26. Motor. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention in any way.

[0022] like Figure 1-3As shown, a multi-stage dry grinding mill includes a frame 12, a shell disposed above the frame 12, crushing chambers formed within the shell, and crushing rotors 13 disposed within the crushing chambers. The crushing chambers are configured as two or more, arranged in a horizontal line, with adjacent chambers connected to each other through openings at their junctions. Each crushing chamber is equipped with a crushing rotor 20, and a discharge port 18 is provided at the bottom of each chamber, with a discharge valve 19 disposed within the discharge port 18. In this embodiment, four crushing chambers are provided: a primary crushing chamber 1601, a secondary crushing chamber 1602, a tertiary crushing chamber 1603, and a quaternary crushing chamber 1604. It is understood that in other embodiments, the number of crushing chambers may be more or less, but there should be at least two crushing chambers. The primary crushing chamber 1601 is located below the feed hopper 2 on the shell. Material enters the primary crushing chamber 1601 from the feed hopper 2 and, under the action of the crushing rotor 20 in the primary crushing chamber 1601, enters the secondary crushing chamber 1602 through the opening between adjacent crushing chambers. It then gradually moves towards the subsequent crushing chambers until it enters the quaternary crushing chamber 1604. During its movement within the multi-stage crushing chambers, the material undergoes multi-stage crushing. Different crushing chambers have different degrees of crushing effect on the material; therefore, the particle size of the powder discharged from each discharge port 18 is also different. The discharge port 18 can be selected as needed to discharge powder of the required particle size. A belt conveyor 11 is also installed on the frame 12 to receive the discharged powder, which is then transported outwards by the belt conveyor 11.

[0023] In this embodiment, the housing includes a lower housing 103 and an upper cover. The lower housing 103 is a cuboid with an open top. The upper cover includes a left cover 101 and a right cover 102. The left cover 101 and the right cover 102 are rotatably connected to the two ends of the lower housing 103 and open and close under the control of corresponding drive mechanisms. Specifically, the end of the left cover 101 is rotatably connected to the left end face of the lower housing 103 via a pin. Each of the opposite sides of the left cover 101 is provided with an opening cylinder 4 as the drive mechanism. The opening cylinder 4 is inclined, and its lower end is connected to a lower hinge seat 13. The lower hinge seat 13 is fixed to the outer side of the lower housing 103. The piston rod end of the opening cylinder 4 is connected to the outer side of the left cover 101 via an upper hinge seat 14. Similarly, the right-side cover 102 is rotatably connected to the other end of the lower housing 103 via a pin, and its opening and closing with the lower housing 103 is achieved through the opening cylinders 4 on both sides. In this way, a total of four opening cylinders 4 are set on both sides of the housing, and each opening cylinder 4 is connected to the hydraulic pump station 5. The hydraulic pump station 5 controls the extension and retraction of the opening cylinders 4, which drives the opening and closing of the left-side cover 101 and the right-side cover 102. When it is necessary to clean, repair, or maintain the crushing chamber inside the housing, the two covers can be opened by the opening cylinders 4, thus forming a sufficiently large opening to facilitate the relevant operations by the staff.

[0024] The top opening of the left side cover 101 is used to install the feed hopper 2.

[0025] In other embodiments, the opening cylinder 4 can also be replaced by an electric cylinder, which can also play the role of controlling the opening and closing of the corresponding machine cover.

[0026] The composition of the crushing chamber can be referenced. Figure 2 As shown, the system includes an arc-shaped support plate 15, an arc-shaped liner 21, and a wear-resistant liner 17 located between adjacent crushing chambers. The inner wall of each crushing chamber includes an outer layer and an inner layer. The outer layer is formed by the upper and lower halves of the arc-shaped support plate 15, and the inner layer consists of multiple arc-shaped liners 21 fixed to the inner side of the arc-shaped support plate 15. These multiple arc-shaped liners 21 are arranged closely together along the circumference. If necessary, multiple wear-resistant strips can also be arranged at equal intervals along the circumference on the inner side of the arc-shaped liners 21. Because the opening between adjacent crushing chambers experiences greater wear, a wear-resistant liner 17 with better wear resistance is provided at this location.

[0027] The crushing rotor 20 is rotatably installed in each crushing chamber, and its installation and driving method can be referred to Figure 3 As shown, the main shaft of the crushing rotor 20 extends out of the lower housing 103 and is rotatably supported on the bearing 23 of the outer bearing housing. One end of the main shaft is the power input end, and a driven pulley 24 is installed at the power input end of the main shaft. Each driven pulley 24 connected to the crushing rotor 20 is connected to the driving pulley 25 below via a transmission belt. The driving pulley 25 is installed on the output shaft of the motor 26, and the motor 26 is fixed to the bottom of the frame 12. In this way, each crushing rotor 20 is driven by a corresponding motor 26, which can realize the control of the rotation speed of different crushing rotors 20, meet various crushing needs, and expand the application range of the device.

[0028] Furthermore, the main shafts of each crushing rotor 20 are arranged alternately on opposite sides of the power input end. This means the driven pulleys 24 on adjacent main shafts are positioned on opposite sides, allowing for a more compact arrangement of the crushing rotors 20. For example... Figure 3 As shown in the figure, the two driven pulleys 24 are located at different ends of the two main shafts.

[0029] It is understood that in other embodiments, the crushing rotor can also be driven by chain drive, in which case the driven sprocket, driving sprocket and drive chain replace the driven pulley, driving pulley and drive belt.

[0030] In order to provide good lubrication for the rotation of the crushing rotor 20, this utility model also provides a lubrication system, the structure of which is as follows: Figure 1As shown, the system includes an oil supply device 6, an oil inlet pipe, and an oil return pipe. The oil supply device 6 includes a lubricating oil tank 601, a motor oil pump 602, a cooler 603, and a filter 604. The cooler 603 is equipped with an oil supply port 605, which is connected to the oil inlet pipe to supply lubricating oil. The lubricating oil then lubricates the bearings 23 in each bearing housing via the oil inlet pipe. The lubricating oil tank 601 has an oil return port 606 on its side, which is connected to the oil return pipe. The lubricating oil used to lubricate the bearings 23 returns to the lubricating oil tank 601 via the oil return pipe. This repeated circulation ensures good lubrication of the bearings 23 and guarantees the safe operation of the crusher rotor 20.

[0031] Since bearing seats are provided on both sides of the housing, two oil inlet pipes and two oil return pipes are provided on both sides of the housing to achieve lubrication and cooling of the corresponding bearing seats.

[0032] Furthermore, the oil inlet pipeline includes a first oil inlet hose 701, an oil inlet distribution pipe 702, and a second oil inlet hose 703. The inlet of the first oil inlet hose 701 is connected to the oil supply port 605. The oil inlet distribution pipe 702 is a straight pipe made of rigid material, installed above the bearing housing. One end of the oil inlet distribution pipe 702 is open and connected to the outlet of the first oil inlet hose 701. The oil inlet distribution pipe 702 has multiple distribution ports. The second oil inlet hose 703 is used to connect the distribution ports and the bearing housing oil inlet. Preferably, each distribution port is located directly above a bearing housing, so that the second oil inlet hose 703 can be in a nearly vertical state, facilitating the smooth flow of lubricating oil into the bearing housing below for lubrication of the bearing.

[0033] Furthermore, the oil return pipeline includes a first oil return hose 801, an oil return manifold 802, and a second oil return hose 803. The outlet of the first oil return hose 801 is connected to the oil return port 606 of the lubricating oil tank 601, and the inlet of the first oil return hose 801 is connected to the opening at one end of the oil return manifold 802. The oil return manifold 802 is a straight pipe made of rigid material and is installed below the bearing housing. The oil return manifold 802 is provided with an oil collection port, which is located below the corresponding bearing housing. The second oil return hose 803 connects the oil drain port below the bearing housing and the oil collection port on the oil return manifold 802, so that the lubricating oil in the bearing housing is discharged and flows back to the lubricating oil tank 601.

[0034] To further reduce dust generation during the feeding and discharging processes and ensure a good working environment, this utility model is equipped with dust suppression and dust collection devices at the feed hopper and discharge port, respectively.

[0035] For the feed hopper, such as Figure 1 , 2As shown, one side of the upper port of the feeding hopper 2 is an open opening 201 for feeding materials, and the other side is a closed opening 202 with a cover plate. A feeding suction pipe 3 is connected to the closed opening 202, and the feeding suction pipe 3 is connected to a corresponding dust collection device to promptly remove dust generated during feeding, preventing dust from spreading outwards. Preferably, the inner wall of the feeding hopper 2 is provided with multiple baffles 22. One end of each baffle 22 is fixed to the feeding hopper 2, and the other end is inclined downwards. Adjacent baffles 22 have opposite inclination directions. The baffles 22 prevent material from splashing outwards during the feeding process. In this embodiment, one baffle 22 is provided at the upper and lower parts of the feeding hopper 2. The upper baffle 22 is positioned between the open opening 201 and the closed opening 202 to prevent material from being directly sucked away by the feeding suction pipe 3 during feeding.

[0036] For the discharge port 18, a dust cover 9 is installed below the discharge port 18. Both ends of the dust cover 9 extend out of the frame 12. The dust cover 9 covers the conveying surface of the belt conveyor 11 below the discharge port 18, and the covered area is larger than the projected area of ​​the upper shell on the belt conveyor 11. The discharge port 18 is connected to the internal space of the dust cover 18. The powder discharged from the discharge port 18 falls directly onto the belt conveyor 11 inside the dust cover 18. Most of the dust generated during the discharge process is confined within the dust cover 9, which can reduce dust leakage. Furthermore, a discharge suction pipe 10 is connected to one end of the dust cover 9. The discharge suction pipe 10 is connected to an external dust collection device to promptly remove the dust inside the dust cover 9.

[0037] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the specific implementation of this utility model with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model are within the protection scope of the pending claims.

Claims

1. A multi-stage dry grinding mill comprising a housing and a plurality of crushing chambers arranged in the housing, the crushing chambers being arranged in a horizontal direction and being in communication with each other, and a crushing rotor being arranged in the crushing chambers, characterized in that: The shell comprises a lower shell and an upper cover, the upper cover comprises a left side cover and a right side cover, the left side cover and the right side cover are respectively rotationally connected at two ends of the lower shell and are opened and closed with the lower shell under the control of a corresponding driving mechanism; the driving mechanism is a linear telescopic mechanism arranged obliquely, one end of which is hinged to the outside of the lower shell and the other end is hinged to the outside of the left side cover or the right side cover.

2. The multi-stage dry grinding mill of claim 1, wherein: The linear telescopic mechanism is an oil cylinder or an electric cylinder.

3. The multi-stage dry grinding mill of claim 1, wherein: The crushing rotor in the crushing cavity comprises a main shaft, the main shaft extends out of the lower shell at two ends and is respectively supported on bearings of a bearing seat, one end of the main shaft is a power input end, and the power input end of the main shaft of each crushing rotor is drivingly connected with a corresponding motor through a transmission mechanism.

4. The multi-stage dry grinding mill of claim 3, wherein: The power input ends of the main shafts of all the crushing rotors are arranged alternately on different sides.

5. The multi-stage dry grinding mill of claim 4, wherein: The transmission mechanism is a belt transmission mechanism or a chain transmission mechanism.

6. The multi-stage dry grinding mill of claim 3, wherein: It also comprises a lubricating system, the lubricating system comprises an oil supply device, an oil inlet pipeline and an oil return pipeline; the oil inlet pipeline comprises a first oil inlet hose, an oil inlet distribution pipe and a second oil inlet hose connected in sequence, the first oil inlet hose is connected with an oil supply port of the oil supply device, the number of the second oil inlet hose is consistent with the number of the bearing seats on one side of the shell, and the second oil inlet hose is used for connecting the oil inlet distribution pipe and the oil inlets of the bearing seats; the oil return pipeline comprises a first oil return hose, an oil return collecting pipe and a second oil return hose connected in sequence, the first oil return hose is connected with an oil return port of the oil supply device, the number of the second oil return hose is consistent with the number of the bearing seats on one side of the shell, and the second oil return hose is used for connecting the oil outlets of the bearing seats and the oil return collecting pipe.

7. The multi-stage dry grinding mill of claim 1, wherein: The bottom of each crushing cavity is provided with a discharge port, a discharge valve is installed at the discharge port, and a belt conveyor is arranged below the discharge port.

8. The multi-stage dry grinding mill of claim 7, wherein: A dust cover is arranged on the upper cover of the belt conveyor, the discharge port is in communication with the inside of the dust cover, and one end of the dust cover is connected with a discharge dust suction pipe.

9. The multi-stage dry grinding mill of claim 1, wherein: A feeding hopper is arranged on the top of the left side cover or the right side cover, the feeding hopper is located above the primary crushing cavity and is in communication with the primary crushing cavity, one side of the upper end of the feeding hopper is open, and the other side is closed by a cover plate, and a feeding dust suction pipe is connected to the closed side.

10. The multi-stage dry grinding mill of claim 9, wherein: A plurality of left-right staggered baffle plates are arranged in the feeding hopper, the baffle plates are inclined downward, and the uppermost baffle plate is located between the closed side and the open side and is inclined to the open side.

Images