Anti-blocking device, coal mill and anti-blocking method

Abstract

The invention relates to the technical field of coal mills, and discloses an anti-blocking device, a coal mill and an anti-blocking method.The anti-blocking device and a powder return pipe suitable for the coal mill comprise a mounting part suitable for being connected with a shell of the coal mill, and the shell is suitable for passively forming vibration in the working state of the coal mill; the transmission unit is suitable for being connected with the mounting part; and the contact part is arranged on the transmission unit and is suitable for being in contact with the outer wall of the powder return pipe so as to transmit the vibration acting force of the shell to the powder return pipe. Through cooperation of the mounting part, the transmission unit and the contact part, vibration generated by working of the coal mill is directly transmitted to the powder return pipe, a conventional vibrator does not need to be arranged at the powder return pipe, the blockage clearing effect on the powder return pipe is guaranteed, the use cost is reduced, and compared with an existing vibrator, the anti-blocking device is small in occupied space and convenient to use. The anti-blocking device can be conveniently and quickly connected with the coal mill.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mills, and particularly relates to an anti-blocking device, a coal mill and an anti-blocking method. Background Art

[0002] The return powder pipe of the coal mill separator usually uses gravity and wind power assistance to re-add the coarse coal to the inside of the coal mill main body for secondary processing.

[0003] When the air flow is unevenly distributed, there is a situation where the coarse coal in the return powder pipe is blocked. Therefore, a vibrator is usually set at the return powder pipe to clear the blockage of the return powder pipe. However, the setting of the vibrator is limited by the size of the coal mill casing, and the output power of the vibrator is not easily sufficient to meet the blockage clearing requirements of the return powder pipe, resulting in poor blockage clearing effect on the return powder pipe and increased use cost. Summary of the Invention

[0004] In view of this, the present invention provides an anti-blocking device, a coal mill and an anti-blocking method to solve the problems of poor blockage clearing effect on the return powder pipe and high use cost when a vibrator is set at the return powder pipe.

[0005] In a first aspect, the present invention provides an anti-blocking device suitable for the return powder pipe of a coal mill, including:

[0006] An installation part, suitable for connecting with the outer shell of the coal mill, wherein the outer shell is suitable for being passively vibrated in the working state of the coal mill;

[0007] A transmission unit, suitable for connecting with the installation part;

[0008] A contact part, arranged on the transmission unit, the contact part is suitable for contacting the outer wall of the return powder pipe to transmit the vibration acting force of the outer shell to the return powder pipe.

[0009] Optionally, the transmission unit includes:

[0010] A plurality of plate members, the installation part is connected with at least one of the plate members, and the contact part is arranged on the surface of the plate member;

[0011] A rotating part, connected between two adjacent plate members to enable the two adjacent plate members to be rotatably connected.

[0012] Optionally, it further includes:

[0013] A plurality of elastic telescopic units, connecting the plate member and the contact part, the elastic telescopic unit is suitable for making the contact part act in a direction perpendicular to the extension direction of the return powder pipe.

[0014] Optionally, the elastic telescopic unit includes:

[0015] An elastic member, one end of which is connected to the plate member;

[0016] A contact member, connected to the other end of the elastic member, and the contact portion is disposed on the surface of the contact member.

[0017] Optionally, the mounting portion includes a plurality of first straight rod members and a plurality of second straight rod members, and the plurality of first straight rod members and the plurality of second straight rod members are respectively used to be connected to different ones of the outer casings.

[0018] Optionally, it further includes:

[0019] A support member, disposed below the transmission unit, and the support member is adapted to be fixedly connected to the coal mill;

[0020] A limiting member, disposed between the support member and the transmission unit, and the limiting member is adapted to limit the support member so that the support member moves along the extending direction of the transmission unit.

[0021] Optionally, the extending direction of the transmission unit is parallel to the extending direction of the coal return pipe, the transmission unit has a lower end in the vertical direction, the support member is correspondingly disposed with the lower end of the transmission unit, and a dirt collecting member is disposed on the support member.

[0022] In a second aspect, the present invention provides a coal mill, including the anti-blocking device according to any one of the above.

[0023] Optionally, it includes:

[0024] A first outer casing, connected to the mounting portion, and the first outer casing is the outer casing of the separator of the coal mill;

[0025] And / or,

[0026] A second outer casing, connected to the mounting portion, and the second outer casing is the outer casing of the coal mill body of the coal mill.

[0027] In a third aspect, the present invention provides an anti-blocking method, applied to the anti-blocking device according to any one of the above, or applied to the coal mill according to any one of the above, and the operation steps include:

[0028] Start the coal mill. During the working state of the coal mill, vibration is passively formed and transmitted to the mounting portion, and the mounting portion is transmitted to the contact portion through the transmission unit, so that the contact portion drives the coal return pipe to vibrate.

[0029] Advantageous effects:

[0030] 1. Through the cooperation of the installation part, the transmission unit and the contact part, the vibration generated by the operation of the coal mill is directly transmitted to the return powder pipe. There is no need to set a conventional vibrator at the return powder pipe, which ensures the effect of unclogging the return powder pipe and reduces the use cost.

[0031] 2. The anti-blocking device occupies less space compared with the existing vibrator, and the anti-blocking device can be conveniently and quickly connected to the coal mill. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Schematic diagram of the positional relationship between the anti-blocking device and the return powder pipe in the embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the positional relationship between the transmission unit and the elastic telescopic unit in the embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the positional relationship between the transmission unit and the support in the embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the positional relationship between the support and the dirt collection part in the embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the structure of the support in the embodiment of the present invention;

[0038] Figure 6 Schematic diagram of the structure of the transmission unit in the embodiment of the present invention;

[0039] Description of the reference numerals:

[0040] 100, return powder pipe;

[0041] 1, installation part; 101, first straight rod member; 102, second straight rod member;

[0042] 2, transmission unit; 201, plate body member; 202, rotating part; 2021, connecting frame; 2022, rotating shaft; 203, arc edge;

[0043] 3, contact part;

[0044] 4, elastic telescopic unit; 401, elastic member; 402, contact member;

[0045] 5. First housing; 6. Second housing;

[0046] 7. Support member; 701. Waterproof cloth; 702. Fixed rubber strip; 703. Snap;

[0047] 8. Limiting member; 801. Chute; 802. Slide block; 803. Connecting rod;

[0048] 9. Sewage collection member; 901. Sewage collection pipe; 902. Cover;

[0049] 10. Groove. Detailed implementation mode

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] The return powder pipe of the separator body of the coal mill usually uses gravity and wind power assistance to re-add the coarse coal to the inside of the coal mill body for secondary processing. If the air flow is unevenly distributed, there will be a situation where the coarse coal in the return powder pipe is blocked. Common coal mills usually use an external housing to centrally accommodate the coal mill body and the separator body to ensure that the related components of the coal mill are not exposed, especially to avoid damage to the return powder pipe caused by external object collision. Therefore, it is difficult to access the return powder pipe without shutting down the machine after the return powder pipe is accidentally blocked.

[0052] The prior art directly adds a vibrator in the internal space of the housing. Although the vibrator can be used to generate vibration force to assist in combing the materials inside the return powder pipe, due to the limited space inside the housing, it is impossible to add a vibrator with a large volume, and a small vibrator cannot ensure the uniform force on the return powder pipe. In addition, increasing the number of vibrators to assist in dredging the blocked return powder pipe not only increases the maintenance cost of the coal mill but also increases the use cost.

[0053] To solve the above problems, please refer to Figures 1-6 , on the first hand, the embodiments of the present invention provide an anti-blocking device suitable for the return powder pipe 100 of a coal mill, including: a mounting part 1 suitable for connecting with the housing of the coal mill, wherein the housing is suitable for being passively vibrated in the working state of the coal mill.

[0054] It can be understood that the housing, as the housing structure of the coal mill body and the separator body of the coal mill, is used to protect its internal structure.

[0055] When the coal mill is in operation, the relative movement between the core components of the coal mill body, such as the grinding table and the grinding rollers, is an important source of vibration. When the grinding table rotates at high speed and the grinding rollers roll and grind the coal on it, complex force interactions will occur between the two. This periodic pressure change and the processes of contact, friction, and separation between the grinding rollers and the surface of the grinding table will cause the vibration of the entire coal mill structure, resulting in the vibration of the outer shell.

[0056] When the coal mill is in operation, the separator body is usually equipped with a ventilation system to carry pulverized coal. If the airflow in the ventilation system is unstable, such as the rotational speed fluctuation of the fan or the change of the air duct resistance, it will cause the disorder of the airflow inside the coal mill. This disordered airflow will generate irregular impact forces on the components of the coal mill, also resulting in the vibration of the outer shell. In addition to the above factors causing the vibration of the outer shell, the operation of the driving device of the coal mill also causes the vibration of the outer shell.

[0057] Refer to Figure 2 , the anti-blocking device further includes a transmission unit 2, which is suitable for connecting with the installation part 1; a contact part 3, which is arranged on the transmission unit 2, and the contact part 3 is suitable for contacting with the outer wall of the return powder pipe 100 to transmit the vibration acting force of the outer shell to the return powder pipe 100.

[0058] In this embodiment, the anti-blocking device includes an installation part 1, a transmission unit 2, and a contact part 3. The installation part 1 is directly connected to the outer shell of the coal mill. The vibration generated during the operation of the coal mill is transmitted to the outer shell, causing the outer shell to vibrate. The vibration of the outer shell drives the installation part 1 to vibrate. Under the transmission action of the transmission unit 2, the installation part 1 drives the contact part 3 to vibrate through the transmission unit 2. The contact part 3 contacts with the return powder pipe 100, driving the return powder pipe 100 to vibrate to achieve the vibration cleaning of the return powder pipe 100.

[0059] In this way, using the vibration of the outer shell of the coal mill to clean the blockage does not require additional installation of complex cleaning equipment, such as a special vibrator, inside the casing, saving the equipment usage cost. And by directly connecting the transmission unit 2 to the installation part 1 and the contact part 3, the vibration of the outer shell is effectively transmitted to the return powder pipe 100, improving the cleaning effect on the return powder pipe 100.

[0060] Preferably, refer to Figure 2 , a plurality of contact parts 3 are provided, and the plurality of contact parts 3 are distributed along the extension direction of the return powder pipe 100. In this way, different contact parts 3 contact with different parts of the return powder pipe 100, enabling the vibration to be transmitted from various parts of the return powder pipe 100, and comprehensive cleaning can be carried out for the blockage conditions in different areas of the return powder pipe 100. Compared with the traditional setting of a single vibrator, it avoids the problem of re-blockage caused by incomplete local cleaning.

[0061] Optionally, the contact part 3 is in contact with the outer wall of the powder return pipe 100, and the contact part 3 abuts against the outer wall of the powder return pipe 100, so that the contact part 3 transmits vibration to the powder return pipe 100. Alternatively, an installation position is provided on the powder return pipe 100, and the contact part 3 and the installation position are fixed by means such as bolts, welding or bonding, and the contact part 3 can also transmit vibration to the powder return pipe 100.

[0062] Optionally, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , the transmission unit 2 includes: a plurality of plate members 201, the installation part 1 is connected to at least one plate member 201, and the contact part 3 is arranged on the surface of the plate member 201; a rotating part 202, which is connected between two adjacent plate members 201, so that the two adjacent plate members 201 are rotatably connected.

[0063] In this embodiment, the combined extension direction of the plurality of plate members 201 is preferably parallel to the extension direction of the powder return pipe 100, so that the contact part 3 is in effective contact with the powder return pipe 100, and the vibration effect of the powder return pipe 100 is improved. According to the length of the powder return pipe 100 and the length of the plate member 201, the number of the plate members 201 is adaptively set according to the actual working conditions. Hereinafter, taking two plate members 201 as an example for specific description.

[0064] In this embodiment, the plate member 201 is preferably a connecting plate with a certain hardness and not prone to deformation. The installation part 1 is connected to at least one plate member 201 to transmit the vibration transmitted by the housing to one or more plate members 201, and then transmitted to all the plate members 201 through the rotating part 202, so as to realize the vibration of all the plate members 201.

[0065] In this embodiment, the contact part 3 is arranged on the surface of the plate member 201. Among them, the contact part 3 can be a structure fixed and protruding from the surface of the plate member 201, and the contact between the contact part 3 and the powder return pipe 100 realizes driving the powder return pipe 100 to vibrate. Alternatively, the contact part 3 is locally formed on the surface of the plate member 201, that is, the surface of the plate member 201 is directly in contact with the outer wall of the powder return pipe 100, and the powder return pipe 100 can also be driven to vibrate.

[0066] In this embodiment, the adjacent plate members 201 are connected by the rotating part 202, so that the adjacent two plate members 201 can rotate relative to each other. In this way, the vibration generated by the housing is transmitted to the plate member 201 through the installation part 1, and the relative rotation of the adjacent two plate members 201 can disperse the load acting on the plate member 201, avoiding stress concentration at a certain point, thereby improving the bearing capacity and durability of the transmission unit 2.

[0067] In this embodiment, the rotating part 202 is a hinge structure or other connection structures that can achieve relative rotation of two adjacent plate members 201.

[0068] In a specific embodiment, referring to Figure 6 , taking the connection of two adjacent plate members 201 through the rotating part 202 as an example, a connection frame 2021 is fixed on the end of one plate member 201, and a rotating shaft 2022 is fixed on the end of the other plate member 201 close to the connection frame 2021. The rotating shaft 2022 passes through the connection frame 2021, and the rotating shaft 2022 is rotationally matched with the connection frame 2021.

[0069] Preferably, referring to Figure 6 , arc sealing edges 203 are arranged at the mutually approaching ends of the two plate members 201, and the arc sealing edges 203 on the surfaces of the two plate members 201 are in close contact to facilitate the relative rotation of the two plate members 201.

[0070] Optionally, referring to Figure 2 、 Figure 3 , it further includes: a plurality of elastic telescopic units 4, connecting the plate member 201 and the contact part 3, and the elastic telescopic unit 4 is adapted to make the contact part 3 act along the extension direction perpendicular to the powder return pipe 100.

[0071] In this embodiment, the plurality of elastic telescopic units 4 are preferably arranged along the extension direction of the powder return pipe 100. The elastic telescopic units 4 are fixed on the plate member 201 and are arranged between the contact part 3 and the plate member 201. The elastic telescopic units 4 are used to support the contact part 3 so that the contact part 3 contacts the powder return pipe 100. At the same time, the elastic telescopic units 4 transfer the vibration of the plate member 201 to the contact part 3.

[0072] The above-mentioned elastic telescopic unit 4 has a telescopic property, and the elastic telescopic unit 4 is used to make the contact part 3 act along its telescopic direction. In this way, the elastic telescopic unit 4 and the plate member 201 cooperate to use the folding structure provided by the rotating part 202 to reduce the concentration effect of the vibration stress on the plate member 201, improve the force uniformity of the elastic telescopic unit 4, and the self-oriented telescopic structure of the elastic telescopic unit 4 converts the irregular vibration stress into a directional impact force, making the contact part 3 act directionally, improving the force uniformity of the powder return pipe 100, and reducing the damage to the powder return pipe 100 caused by frequent vibration stress.

[0073] Optionally, referring to Figure 4 , the elastic telescopic unit 4 includes: an elastic member 401, one end of which is connected to the plate member 201; a contact member 402, connected to the other end of the elastic member 401, and the contact part 3 is arranged on the surface of the contact member 402.

[0074] In this embodiment, the elastic member 401 is a spring, and the contact member 402 is a contact plate. Both ends of the spring are fixed to the surface of the plate member 201 and the surface of the contact plate respectively. The vibration received by the plate member 201 is directly transmitted to the elastic member 401, and the structure of the elastic member 401 itself contracts and deforms under the vibration stress, thereby adjusting the frequency and intensity of the vibration transmitted to the powder return pipe 100, reducing the damage to the powder return pipe 100 caused by continuous vibration, and the contact member 402 directly defines the force application point of the elastic member 401. And the material of the contact member 402 is designed to have a certain flexibility to ensure that the contact member 402 is suitable for the powder return pipe 100 with different surfaces.

[0075] Of course, in addition to using the above-mentioned spring as the elastic structure, the elastic member 401 can also use a spring sheet or other structures with elastic deformation ability.

[0076] In this embodiment, the contact part 3 is arranged on the surface of the contact member 402. Among them, the contact part 3 can be a structure fixed and protruding from the surface of the contact member 402, and the contact between the contact part 3 and the powder return pipe 100 realizes driving the powder return pipe 100 to vibrate. Or, the contact part 3 is locally formed on the surface of the contact member 402, that is, the surface of the contact member 402 is directly in contact with the outer wall of the powder return pipe 100, and the powder return pipe 100 can also be driven to vibrate.

[0077] Optionally, the installation part 1 includes a plurality of first straight rod members 101 and a plurality of second straight rod members 102, and the plurality of first straight rod members 101 and the plurality of second straight rod members 102 are respectively used to connect to different outer shells.

[0078] In this embodiment, referring to Figure 1 , Figure 2 , Figure 3 , the plate member 201 is connected to different outer shells of the coal mill through the first straight rod member 101 and the second straight rod member 102, or the plate member 201 is connected to different regions of the outer shell of the coal mill through the first straight rod member 101 and the second straight rod member 102. The above settings enable the plate member 201 to obtain vibrations at different positions through the first straight rod member 101 and the second straight rod member 102, and then transmit the vibrations at different positions to the powder return pipe 100. Under this setting, on the one hand, by obtaining the vibrations of different regions of the outer shell of the coal mill, the vibration force obtained by the powder return pipe 100 can be relatively large, improving the anti-blocking effect of the powder return pipe 100. On the other hand, when the vibration force in some regions of the outer shell of the coal mill decreases or disappears, under the action of other regions of the outer shell of the coal mill, the powder return pipe 100 can still be kept vibrating to prevent blockage.

[0079] Preferably, the first straight rod member 101 and the second straight rod member 102 are arranged close to the driving motor of the coal mill, and the area where the driving motor is arranged on the housing usually vibrates more stably and strongly. Of course, the arrangement positions of the first straight rod member 101 and the second straight rod member 102 can also be adaptively adjusted according to actual working conditions.

[0080] Optionally, refer to Figure 3 , Figure 4 , Figure 5 The anti-blocking device also includes: a support member 7, which is arranged below the transmission unit 2, and the support member 7 is suitable for being fixedly connected to the coal mill; a limit member 8, which is arranged between the support member 7 and the transmission unit 2, and the limit member 8 is suitable for limiting the support member 7 so that the support member 7 moves along the extension direction of the transmission unit 2.

[0081] In this embodiment, the support member 7 is preferably fixed to the outer casing of the coal mill, and the support member 7 is arranged below the transmission unit 2. The support member 7 and the plate member 201 are arranged correspondingly. When the plate member 201 falls off, the support member 7 can receive the fallen plate member 201 to prevent the anti-blocking device itself from damaging the coal mill.

[0082] In a specific embodiment, referring to Figure 5 The support member 7 includes a waterproof cloth 701, and a plurality of fixing rubber strips 702 are fixed on the outer circumference of the waterproof cloth 701. The fixing rubber strips 702 are bonded and fixed to the outer shell of the coal mill. The waterproof cloth 701 is set as a fan-shaped storage structure, and buckles 703 are respectively fixed on both ends of the waterproof cloth 701. After the waterproof cloth 701 is fully unfolded, the two buckles 703 are clamped together, so that the unfolded waterproof cloth 701 forms a complete support structure.

[0083] In the above embodiment, after the installation part 1, the transmission unit 2 and the contact part 3 are installed, the waterproof cloth 701 is arranged below the transmission unit 2, and the fixing rubber strip 702 is connected to the outer shell of the coal mill to fix the waterproof cloth 701. In this way, when the plate member 201 in the transmission unit 2 falls off or the elastic expansion unit 4 falls off, the waterproof cloth 701 can be used to receive the corresponding falling parts to avoid damaging the parts of the coal mill.

[0084] Alternatively, in addition to the above-mentioned arrangement of the waterproof cloth 701 and the fixing rubber strip 702, the support member 7 can also adopt a rigid support plate, which is connected to the outer shell of the coal mill by bolts or bonding, and can also support the plate member 201.

[0085] In this embodiment, the support member 7 is connected to the plate member 201 via the limit member 8, and the limit member 8 is used to position the support member 7, so that the support member 7 can be conveniently and quickly arranged at a preset position and ensure the supporting effect on the plate member 201.

[0086] In a specific embodiment, referring to Figure 4 The limiter 8 includes a slide groove 801 arranged on the plate member 201, and the slide groove 801 is arranged on the wall surface of the plate member 201 away from the powder return pipe 100. A slider 802 is provided in the slide groove 801 for limited sliding cooperation, and a connecting rod 803 is fixed on the slider 802, and the connecting rod 803 is fixed to the support member 7. In this way, the support member 7 and the plate member 201 are connected by the limiter 8. When the support member 7 is installed, the limiter 8 is used to make the support member 7 and the plate member 201 slide and cooperate, so that the positions of the plate member 201 and the support member 7 match, and the plate member 201 is effectively supported.

[0087] Of course, in addition to the above-mentioned cooperation mode of the slide groove 801 and the slider 802 , the limiting member 8 can also adopt a limiting structure such as a slide rail structure to achieve that the support member 7 can be limited by the limiting member 8 .

[0088] Further, refer to Figure 4 A groove 10 is provided on the wall surface of the plate member 201 where the slide groove 801 is provided. The groove 10 is used to reduce the total weight of the plate member 201, thereby reducing the load burden of the mounting portion 1. The length of the connecting rod 803 is greater than the depth of the groove 10, so that the connecting rod 803 and the waterproof cloth 701 of the support member 7 can protrude from the groove 10 during installation.

[0089] Optionally, refer to Figure 3 , Figure 4 The transmission unit 2 and the powder return pipe 100 are arranged in parallel in their extending directions. The transmission unit 2 is provided with a lower end in the vertical direction. The support member 7 and the lower end of the transmission unit 2 are arranged correspondingly, and a dirt collecting member 9 is provided on the support member 7.

[0090] In this embodiment, a dirt collecting member 9 is also provided on the waterproof cloth 701 of the support member 7, and the support member 7 can not only realize the receiving function of the plate member 201, but also realize the dirt collecting function. The powder return pipe 100 is usually arranged at an angle, the transmission unit 2 and the powder return pipe 100 are parallel, the transmission unit 2 is arranged at an angle and has a lowest end and a highest end, and the support member 7 is preferably arranged at a position close to the lowest end of the transmission unit 2, or at a position not at the highest end, so that the fallen plate member 201 can be effectively received by the support member 7, and at the same time, the oil and impurities accidentally dropped from the casing of the coal mill can fall onto the support member 7 under the action of gravity, so that the oil and impurities are effectively collected.

[0091] In a specific embodiment, referring to Figure 4, the dirt collection member 9 includes a dirt collection pipe 901. The dirt collection pipe 901 is arranged at the central position of the waterproof cloth 701 and fixed to the waterproof cloth 701. The dirt collection pipe 901 is fixedly connected to the connecting rod 803, so that the limiting member 8 and the supporting member 7 are connected. And the top opening of the dirt collection pipe 901 communicates with the top surface of the waterproof cloth 701, and a detachable cover 902 is installed at the bottom opening of the dirt collection pipe 901.

[0092] In this way, the waterproof cloth 701 is used to isolate the space inside the casing of the coal mill. The oil stains and impurities that accidentally fall inside the casing of the coal mill are directly received by the waterproof cloth 701, and the oil stains and impurities slowly flow into the interior of the dirt collection pipe 901 under the influence of gravity, thereby improving the cleanliness inside the casing of the coal mill. When it is necessary to clean the impurities, only the cover 902 needs to be separated.

[0093] Of course, in addition to the above-mentioned cooperation method of the dirt collection pipe 901 and the cover 902 for the dirt collection member 9, the waterproof cloth 701 can also be a structure with a sunken center and a protruding edge. The surface of the dirt collection member 9 is formed by the structure of the waterproof cloth 701 itself, and the effect of collecting oil stains and impurities can also be achieved. Under the above settings, the connecting rod 803 is adapted to be directly connected and fixed to the surface of the waterproof cloth 701 or its support framework.

[0094] In a second aspect, an embodiment of the present invention provides a coal mill, including the above-mentioned anti-blocking device. The anti-blocking device is arranged inside the casing of the coal mill and contacts the return powder pipe 100, and is used to transmit the vibration formed passively during the operation of the coal mill to the return powder pipe 100 to realize vibration cleaning and blockage removal of the return powder pipe 100.

[0095] Optionally, the coal mill includes a first outer casing 5, which is connected to the installation part 1. The first outer casing 5 is the outer casing of the separator of the coal mill; and / or a second outer casing 6, which is connected to the installation part 1. The second outer casing 6 is the outer casing of the coal mill body of the coal mill.

[0096] In this embodiment, the coal mill includes a coal mill body for grinding coal materials and a separator body for pneumatic separation. The first outer casing 5 is an outer casing for protecting the internal components of the separator body, and the second outer casing 6 is an outer casing for protecting the internal components of the coal mill body. The internal components of both generate vibrations during operation and are respectively transmitted to the first outer casing 5 and the second outer casing 6.

[0097] It can be understood that the installation part 1 includes a plurality of first straight rod members 101 and a plurality of second straight rod members 102. The first straight rod members 101 are fixedly connected to the first outer casing 5, and the vibration generated by the operation of the separator body is transmitted to the return powder pipe 100 through the first straight rod members 101. The second straight rod members 102 are fixedly connected to the second outer casing 6, and the vibration generated by the operation of the coal mill body is transmitted to the return powder pipe 100 through the second straight rod members 102.

[0098] Under the above setting method, the first housing 5 and the second housing 6 serve as two vibration sources. When used simultaneously, the two vibration sources can produce constructive interference, superimposing and enhancing the amplitude. Compared with a single vibration source, the dual vibration sources help to achieve a more stable and extensive vibration coverage area. In addition, by reasonably adjusting the frequency and phase relationship of the two vibration sources, the resonance phenomenon of the system can be avoided or reduced, thereby improving the stability.

[0099] In a third aspect, an anti-blocking method provided by an embodiment of the present invention is applied to the above anti-blocking device or to the above coal mill, and includes: starting the coal mill. During the operation of the coal mill, vibration is passively formed and transmitted to the installation part 1. The installation part 1 is transmitted to the contact part 3 through the transmission unit 2, so that the contact part 3 drives the return powder pipe 100 to vibrate.

[0100] Before starting the coal mill, the installation steps of the anti-blocking device include: bringing the surface of the contact part 3 into contact with the return powder pipe 100, and then respectively fixing the first straight rod member 101 and the second straight rod member 102 at the parts with larger vibration areas on the outer shell of the separator main body and the outer shell of the coal mill main body. Then, unfold the waterproof cloth 701 and fix the fixing rubber strip 702 on the surface of the outer shell of the coal mill main body or the outer shell of the separator main body, thereby dividing the interior of the casing of the coal mill into upper and lower spaces.

[0101] The unfolded waterproof cloth 701 can directly pick up the oil stains and impurities falling from above, and the oil stains and impurities flow on the surface of the waterproof cloth 701 and are concentrated inside the sewage collection pipe 901. During the process of using the coal mill, the vibration generated by the operation of the motor of the separator main body and the motor of the coal mill main body is directly transmitted to the plate member 201 by the first straight rod member 101 and the second straight rod member 102. The vibration stress is converted into an impact force applied to the return powder pipe 100 through the elastic member 401, continuously knocking on the surface of the return powder pipe 100, thereby reducing the concentration of coarse coal inside the return powder pipe.

[0102] In the above embodiment, the first straight rod member 101 and the second straight rod member 102 are prefabricated parts. Appropriate first straight rod member 101 and second straight rod member 102 can be selected according to the situation inside the casing of the coal mill, and then they are fixed on the areas with larger vibration forces on the surfaces of the first housing 5 and the second housing 6 by bolts, so as to ensure that the first straight rod member 101 and the second straight rod member 102 can transmit sufficient vibration stress.

[0103] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An anti-blocking device, characterized in that: A powder return pipe (100) suitable for a coal mill comprises: A mounting portion (1) adapted to be connected to a housing of the coal mill, wherein the housing is adapted to passively generate vibration when the coal mill is in operation; A transmission unit (2), adapted to be connected to the mounting portion (1); A contact portion (3) is arranged on the transmission unit (2), and the contact portion (3) is suitable for contacting the outer wall of the powder return pipe (100) to transmit the vibration force of the shell to the powder return pipe (100).

2. The anti-blocking device according to claim 1, characterized in that: The transmission unit (2) comprises: A plurality of plate components (201), the mounting portion (1) being connected to at least one of the plate components (201), and the contact portion (3) being arranged on a surface of the plate component (201); The rotating part (202) is connected between two adjacent plate components (201) so that the two adjacent plate components (201) are rotatably connected.

3. The anti-blocking device according to claim 2, characterized in that: Also includes: A plurality of elastic telescopic units (4) connect the plate member (201) and the contact portion (3), and the elastic telescopic units (4) are suitable for causing the contact portion (3) to move along a direction perpendicular to the extension direction of the powder return pipe (100).

4. The anti-blocking device according to claim 3, characterized in that: The elastic expansion unit (4) comprises: An elastic member (401), one end of which is connected to the plate member (201); The contact piece (402) is connected to the other end of the elastic piece (401), and the contact portion (3) is arranged on the surface of the contact piece (402).

5. The anti-blocking device according to claim 1, characterized in that: The mounting portion (1) comprises a plurality of first straight rod members (101) and a plurality of second straight rod members (102), wherein the plurality of first straight rod members (101) and the plurality of second straight rod members (102) are respectively used to be connected to different housings.

6. The anti-blocking device according to any one of claims 1 to 5, characterized in that: Also includes: A support member (7) is arranged below the transmission unit (2), and the support member (7) is suitable for being fixedly connected to the coal mill; A limiting member (8) is arranged between the support member (7) and the transmission unit (2), and the limiting member (8) is suitable for limiting the support member (7) so that the support member (7) moves along the extension direction of the transmission unit (2).

7. The anti-blocking device according to claim 6, characterized in that: The transmission unit (2) and the powder return pipe (100) are arranged in parallel in their extension directions, the transmission unit (2) is provided with a lower end in the vertical direction, the support member (7) and the lower end of the transmission unit (2) are arranged correspondingly, and a dirt collecting member (9) is provided on the support member (7).

8. A coal mill, characterized in that: The invention comprises the anti-blocking device according to any one of claims 1 to 7.

9. The coal mill according to claim 8, characterized in that: include: A first shell (5) connected to the mounting portion (1), wherein the first shell (5) is a shell of a separator of the coal mill; and / or, A second outer shell (6) is connected to the mounting portion (1), and the second outer shell (6) is the outer shell of the coal mill body of the coal mill.

10. A method for preventing blocking, applied to the anti-blocking device according to any one of claims 1 to 7, or applied to the coal mill according to any one of claims 8 to 9, characterized in that: The steps include: When the coal mill is started, vibration is passively generated in the working state of the coal mill and transmitted to the mounting part (1), and the mounting part (1) transmits the vibration to the contact part (3) through the transmission unit (2), so that the contact part (3) drives the powder return pipe (100) to vibrate.

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