Spiral coal unloading machine

Abstract

The invention provides a spiral coal unloading machine, and relates to the technical field of coal unloading, the spiral coal unloading machine comprises a bearing seat, a material conveying mechanism is arranged in the bearing seat, moving wheels are arranged at the bottom of the bearing seat, a telescopic mechanism is arranged at the top of the bearing seat, a spiral coal unloading mechanism is arranged on one side of the telescopic mechanism, and the spiral coal unloading mechanism is arranged on the other side of the telescopic mechanism. The spiral coal unloading mechanism is communicated with the bearing base through a coal conveying pipe, the bearing base is supported by the moving wheels, the spiral coal unloading machine can conveniently move to a proper position to conduct coal unloading operation, the conveying mechanism in the bearing base is fixedly supported, the telescopic mechanism is supported by the top of the bearing base, and the coal unloading operation is more convenient. The telescopic mechanism supports the spiral coal unloading mechanism and adjusts the position of the spiral coal unloading mechanism in the horizontal direction at the same time, the spiral coal unloading mechanism unloads coal in a coal conveyor and conveys the coal into the conveying mechanism through a coal conveying pipe to be conveyed to a proper position for centralized treatment, and large-scale coal unloading is facilitated; and the coal unloading efficiency is improved while the manpower is saved.

Description

Technical Field

[0001] The invention relates to the technical field of coal unloading, in particular to a screw coal unloader. Background Art

[0002] The most traditional way of unloading coal is for workers to use tools such as shovels to shovel coal from cars or trains, then put it into bags or transport it to designated locations. The advantages of this method are simple operation, low investment cost, and suitable for small-scale coal unloading tasks. However, its disadvantages are high labor intensity, low efficiency, and it is not suitable for large-scale coal unloading tasks, and it is not convenient to adjust the position according to actual conditions.

[0003] Therefore, in view of the above situation, such as 201710846128.3, which discloses an environmentally friendly port fully enclosed coal transportation system, it is urgent to develop a spiral coal unloader to overcome the shortcomings in current practical applications. Summary of the invention

[0004] The invention provides a spiral coal unloader to solve the defects in the prior art.

[0005] The present invention provides a screw coal unloading machine, comprising: a bearing seat, a feeding mechanism is arranged inside the bearing seat, a moving wheel is arranged at the bottom of the bearing seat, a telescopic mechanism is arranged at the top of the bearing seat, a screw coal unloading mechanism is arranged on one side of the telescopic mechanism, and the screw coal unloading mechanism is connected to the bearing seat through a coal transport pipe.

[0006] Preferably, a material transport cavity is opened in the supporting seat, and the feeding mechanism includes a transport belt, and the transport belt is arranged in the material transport cavity. A first driving module is arranged on the outer wall of the supporting seat, and the transport belt is drivingly connected to the first driving module. A feed port is opened on the top of the supporting seat, and a scraper plate is arranged on one side of the feed port. A discharge port is opened at the bottom of the supporting seat, and a discharge pipe is arranged at the discharge port.

[0007] Preferably, the telescopic mechanism includes a fixed seat, which is fixedly arranged on the top of the bearing seat, and a limiting cavity and a first driving cavity are provided in the fixed seat. A through column is inserted in the limiting cavity, and limiting cards are respectively provided on the top and bottom of the through column. A telescopic part is provided in the first driving cavity, and the telescopic end of the telescopic part passes through the fixed seat and is fixedly connected with the limiting card at the bottom of the through column.

[0008] Preferably, the spiral coal unloading mechanism includes a lifting sleeve, one side of the lifting sleeve is fixedly connected to one end of the interpenetrating column, a coal pipe cavity is vertically opened in the lifting sleeve, a coal unloading pipe is inserted in the coal pipe cavity, a plurality of screws are rotatably arranged on the top of the lifting sleeve, a limiting plate is arranged on the outer wall of the coal unloading pipe, a limiting hole is arranged in the limiting plate, the screw is inserted in the limiting hole, the outer wall of the screw is connected to the inner wall of the limiting hole by a thread, a blocking block is arranged on the top of the screw, a first bevel gear is arranged at the lower part of the screw, and the first bevel gear is drivingly connected to the second driving module.

[0009] Preferably, a support plate is provided in the coal unloading pipe, and the support plate separates the coal unloading pipe into a coal unloading chamber and a second driving chamber. A motor is provided in the second driving chamber. A rotating shaft is vertically provided in the coal unloading chamber, and spiral blades are provided on the rotating shaft. The driving end of the motor passes through the support plate and is transmission-connected to the rotating shaft. A coal discharge port is provided on the side wall of the coal unloading pipe below the support plate.

[0010] Preferably, both ends of the coal transport pipe are connected to the coal discharge port and the material discharge port respectively.

[0011] Preferably, it also includes: Power detection module, used to measure the real-time output power of the motor; A rotation speed detection module is used to measure the rotation speed of the rotating shaft; A speed detection module is used to measure the discharge speed of coal from the coal discharge port; Height detection module 1, used to measure the height of the upper coal discharge port of the coal unloading chamber from the ground; Height detection module 2, used to measure the height of the bottom of the coal unloading chamber from the ground; An alarm module, used for issuing an alarm; The calculation module 1 is used to calculate the actual safety factor of the spiral coal unloading mechanism based on the real-time output power of the motor; A processing module, used for comparing the actual safety factor of the spiral coal unloading mechanism obtained by the calculation module 1 with the rated safety factor of the spiral coal unloading mechanism; Control module, when the actual safety factor of the spiral coal unloading mechanism is less than the rated safety factor of the spiral coal unloading mechanism, the control alarm module will sound an alarm and control the spiral coal unloading mechanism to stop working. When the actual safety factor of the spiral coal unloading mechanism is greater than or equal to the rated safety factor of the spiral coal unloading mechanism, the spiral coal unloading mechanism will work normally.

[0012] Preferably, the calculation module 1 calculates based on the following formula 1: ; is the actual safety factor of the spiral coal unloading mechanism, is the real-time output power of the motor, is the rotation speed of the rotating shaft, is the pitch of the spiral blade, is the density of coal in the coal unloading pipe, is the filling factor of coal, is the vertical transport coefficient, is the radius of the spiral blade, is the radius of the inner wall of the coal unloading pipe, is the circumference of a circle, is the friction coefficient between the coal and the inner wall of the coal unloading pipe, is the friction coefficient between coal and spiral blades, is the discharge speed of coal from the coal discharge port, It is the height of the coal discharge port on the coal unloading chamber from the ground. is the height from the bottom of the coal unloading chamber to the ground. is the acceleration due to gravity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 is a schematic cross-sectional structure diagram of a bearing seat provided by an embodiment of the present invention; Figure 3 It is a schematic cross-sectional structure diagram of a spiral coal unloading mechanism provided in an embodiment of the present invention.

[0015] Reference numerals: 1. Bearing seat; 11. Material transport cavity; 12. Material feeding mechanism; 121. Transport belt; 122. Material feed port; 123. Scraper plate; 124. Material discharge port; 125. Material discharge pipe; 2. Moving wheel; 3. Telescopic mechanism; 31. Fixed seat; 32. Limiting cavity; 33. First drive cavity; 34. Inserting column; 35. Limiting card; 36. Telescopic member; 4. Spiral coal unloading mechanism; 41. Lifting sleeve; 42. Coal pipe cavity; 43. Coal unloading pipe; 431. Support plate; 432. Coal unloading cavity; 433. Second drive cavity; 434. Motor; 435. Rotating shaft; 436. Spiral blade; 437. Coal discharge port; 44. Screw; 45. Limiting plate; 46. Limiting hole; 47. Block; 48. First bevel gear; 5. Coal transport pipe. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0018] The present invention provides the following embodiments Example 1 The embodiment of the present invention provides a spiral coal unloading machine, such as Figure 1-Figure 3 As shown, it includes: a bearing seat 1, a feeding mechanism 12 is arranged inside the bearing seat 1, a moving wheel 2 is arranged at the bottom of the bearing seat 1, a telescopic mechanism 3 is arranged on the top of the bearing seat 1, a spiral coal unloading mechanism 4 is arranged on one side of the telescopic mechanism 3, and the spiral coal unloading mechanism 4 is connected to the bearing seat 1 through a coal transport pipe 5.

[0019] The working principle and beneficial effects of the above technical solution are as follows: the moving wheel 2 supports the bearing seat 1, which facilitates the screw coal unloader to move to a suitable position for coal unloading operations. The feeding mechanism 12 in the bearing seat 1 is fixedly supported, and the top of the bearing seat 1 supports the telescopic mechanism 3. The telescopic mechanism 3 supports the spiral coal unloading mechanism 4 and adjusts the horizontal position of the spiral coal unloading mechanism 4. The spiral coal unloading mechanism 4 unloads the coal in the coal truck and transports it to the feeding mechanism 12 through the coal transport pipe 5 and transmits it to a suitable position for centralized processing, which facilitates large-scale coal unloading, saves manpower and improves the coal unloading efficiency.

[0020] Example 2 On the basis of Example 1, Figure 1-Figure 3As shown, a material transport cavity 11 is provided in the support seat 1, and the feeding mechanism 12 includes a transport belt 121, and the transport belt 121 is arranged in the material transport cavity 11. A first driving module is provided on the outer wall of the support seat 1, and the transport belt 121 is drivingly connected to the first driving module. A feed port 122 is provided on the top of the support seat 1, and a scraper plate 123 is provided on one side of the feed port 122. A discharge port 124 is provided at the bottom of the support seat 1, and a discharge pipe 125 is provided at the discharge port 124.

[0021] The working principle and beneficial effects of the above technical solution are as follows: the coal transmitted from the coal transport pipe 5 enters the transport cavity 11 through the feed port 122, the scraper plate 123 guides the coal coming down from the feed port 122 and at the same time scrapes the coal stuck on the transport belt 121 to prevent the coal stuck on the transport belt 121 from accumulating and clogging the transport cavity 11, the transport cavity 11 and the transport belt 121 constitute a channel for transporting the coal, the outer wall of the support seat 1 supports the first drive module, the first drive module is an existing device, the first drive module drives the transport belt 121 to operate in the transport cavity 11 through power transmission, and discharges the coal entering the transport cavity 11 through the discharge pipe 125 on the discharge port 124 to the outside of the support seat 1 for concentration.

[0022] Example 3 On the basis of Example 2, Figure 1-Figure 3 As shown, the telescopic mechanism 3 includes a fixed seat 31, which is fixedly arranged on the top of the supporting seat 1. A limit cavity 32 and a first driving cavity 33 are provided in the fixed seat 31. A through column 34 is inserted in the limit cavity 32. Limiting cards 35 are respectively provided on the top and bottom of the through column 34. A telescopic member 36 is provided in the first driving cavity 33. The telescopic end of the telescopic member 36 passes through the fixed seat 31 and is fixedly connected with the limit card 35 at the bottom of the through column 34.

[0023] The working principle and beneficial effects of the above technical solution are as follows: the telescopic member 36 is a cylinder, the bearing seat 1 provides fixed support for the fixed seat 31, the first driving chamber 33 opened in the fixed seat 31 fixes the main part of the cylinder, and the horizontally opened limit chamber 32 in the fixed seat 31 limits the vertical direction of the insertion column 34, and the insertion column 34 fixes the limit cards 35 arranged above and below it, and the limit cards 35 prevent the insertion column 34 from slipping in the horizontal direction. The telescopic end of the cylinder pushes the limit card 35 to adjust the position of the spiral coal unloading mechanism 4 and the coal truck, which facilitates the spiral coal unloading mechanism 4 to unload coal more efficiently.

[0024] Example 4 On the basis of Example 3, Figure 1-Figure 3As shown, the spiral coal unloading mechanism 4 includes a lifting sleeve 41, one side of the lifting sleeve 41 is fixedly connected to one end of the interpenetrating column 34, a coal tube cavity 42 is vertically opened in the lifting sleeve 41, a coal unloading pipe 43 is inserted in the coal tube cavity 42, a plurality of screws 44 are rotatably arranged on the top of the lifting sleeve 41, a limiting plate 45 is arranged on the outer wall of the coal unloading pipe 43, a limiting hole 46 is arranged in the limiting plate 45, the screw 44 is inserted in the limiting hole 46, the outer wall of the screw 44 is connected to the inner wall of the limiting hole 46 by threads, a block 47 is arranged on the top of the screw 44, a first bevel gear 48 is arranged at the lower part of the screw 44, and the first bevel gear 48 is drivingly connected to the second driving module.

[0025] The working principle and beneficial effects of the above technical solution are as follows: one end of the interlaced column 34 fixes and supports the lifting sleeve 41, the coal pipe cavity 42 opened in the vertical direction in the lifting sleeve 41 limits the horizontal direction of the coal unloading pipe 43, the top of the lifting sleeve 41 rotatably supports the multiple screws 44, the multiple screws 44 are symmetrically arranged around the axis of the lifting sleeve 41, the outer wall of the coal unloading pipe 43 fixes the multiple limit plates 45, the number of limit plates 45 and the number of screws 44 is the same, each screw 44 is rotatably arranged in the limit hole 46 on the corresponding limit plate 45, the top of the lifting sleeve 41 supports the second drive module, the second drive module is an existing device, the second drive module drives the multiple screws 44 to rotate by meshing with the first bevel gear 48 on the screw 44, thereby realizing the lifting and lowering of the multiple limit plates 45 on the screw 44, and at the same time the coal unloading pipe 43 and the multiple screws 44 are lifted and lowered in the vertical direction in the lifting sleeve 41, so as to facilitate the adjustment of the vertical height position of the spiral coal unloading mechanism 4 on the coal truck.

[0026] Example 5 On the basis of Example 4, Figure 1-Figure 3 As shown, a support plate 431 is provided in the coal unloading pipe 43, and the support plate 431 separates the coal unloading pipe 43 into a coal unloading chamber 432 and a second driving chamber 433. A motor 434 is provided in the second driving chamber 433. A rotating shaft 435 is vertically provided in the coal unloading chamber 432, and a spiral blade 436 is provided on the rotating shaft 435. The driving end of the motor 434 passes through the support plate 431 and is transmission-connected with the rotating shaft 435. A coal discharge port 437 is opened on the side wall of the coal unloading pipe 43 below the support plate 431, and both ends of the coal transport pipe 5 are respectively connected with the coal discharge port 437 and the discharge port 124.

[0027] The working principle and beneficial effects of the above technical solution are as follows: the inner wall of the coal unloading pipe 43 horizontally supports and fixes the support plate 431, the support plate 431 supports the motor 434 arranged in the second driving chamber 433, the support plate 431 rotatably fixes the rotating shaft 435, the driving end of the motor 434 is connected to the rotating shaft 435 through a coupling, the rotating shaft 435 fixes the spiral blade 436, the motor 434 drives the rotating shaft 435 and the spiral blade 436 to rotate, the eyebrow-lifting blade extending out of the bottom of the coal unloading pipe 43 extends into the coal carried by the coal truck, and the coal is rolled into the coal unloading chamber 432 for upward transportation, and the coal is transported to the coal discharge port 437 on the coal unloading pipe 43 and discharged to the discharge port 124 through the coal transport pipe 5, enters the transport belt 121, and is discharged to a suitable position through the discharge pipe 125 for concentration.

[0028] Example 6 On the basis of Example 5, the invention further comprises: A power detection module, used to measure the real-time output power of the motor 434; A rotation speed detection module, used to measure the rotation speed of the rotating shaft 435; A speed detection module, used to measure the discharge speed of coal from the coal discharge port 437; Height detection module 1, used to measure the height between the coal discharge port 437 on the coal discharge chamber 432 and the ground; Height detection module 2, used to measure the height of the bottom of the coal unloading chamber 432 from the ground; An alarm module, used for issuing an alarm; Calculation module 1, used to calculate the actual safety factor of the spiral coal unloading mechanism 4 based on the real-time output power of the motor 434; A processing module, used for comparing the actual safety factor of the spiral coal unloading mechanism 4 obtained by the calculation module 1 with the rated safety factor of the spiral coal unloading mechanism 4; Control module, when the actual safety factor of the spiral coal unloading mechanism 4 is less than the rated safety factor of the spiral coal unloading mechanism 4, the control alarm module sounds an alarm and controls the spiral coal unloading mechanism 4 to stop working. When the actual safety factor of the spiral coal unloading mechanism 4 is greater than or equal to the rated safety factor of the spiral coal unloading mechanism 4, the spiral coal unloading mechanism 4 works normally.

[0029] The working principle and beneficial effects of the above technical solution are as follows: the power detection module measures the real-time output power of the motor 434, the speed detection module measures the speed of the rotating shaft 435, the speed detection module measures the discharge speed of the coal from the coal discharge port, the height detection module 1 measures the height of the coal discharge port 437 on the coal unloading chamber 432 from the ground, the height detection module 2 measures the height of the bottom of the coal unloading chamber 432 from the ground, the alarm module is used to issue an alarm, the calculation module 1 calculates the actual safety factor of the spiral coal unloading mechanism 4 based on the real-time output power of the motor 434, the processing module compares and processes the actual safety factor of the spiral coal unloading mechanism 4 obtained by the calculation module 1 with the rated safety factor of the spiral coal unloading mechanism 4, when the actual safety factor of the spiral coal unloading mechanism 4 is less than the rated safety factor of the spiral coal unloading mechanism 4, the control module controls the alarm module to issue an alarm and controls the spiral coal unloading mechanism 4 to stop working, and when the actual safety factor of the spiral coal unloading mechanism 4 is greater than or equal to the rated safety factor of the spiral coal unloading mechanism 4, the spiral coal unloading mechanism 4 works normally.

[0030] Example 7 Based on Example 6, the calculation module 1 calculates based on the following formula 1: ; is the actual safety factor of the spiral coal unloading mechanism 4, is the real-time output power of the motor 434, is the rotation speed of the rotating shaft 435, is the pitch of the spiral blade 436, is the density of coal in the coal discharge pipe 43, is the filling factor of coal, is the vertical transport coefficient, is the radius of the spiral blade 436, is the radius of the inner wall of the coal discharge pipe 43, is the circumference of a circle, is the friction coefficient between the coal and the inner wall of the coal discharge pipe 43, is the friction coefficient between the coal material and the spiral blade 436, is the discharge speed of coal from the coal discharge port 437, is the height from the ground to the coal discharge port 437 of the coal discharge chamber 432. is the height from the bottom of the coal unloading chamber 432 to the ground, is the acceleration due to gravity.

[0031] The working principle and beneficial effects of the above technical solution are: Calculate the dynamic safety factor of the spiral coal unloading mechanism 4, through Calculate the coal gravity safety factor borne by the spiral coal unloading mechanism 4, through The actual safety factor of the spiral coal unloading mechanism 4 is calculated. When the actual safety factor of the spiral coal unloading mechanism 4 is less than the rated safety factor of the spiral coal unloading mechanism 4, the control module controls the alarm module to sound an alarm and control the spiral coal unloading mechanism to stop working. When the actual safety factor of the spiral coal unloading mechanism 4 is greater than or equal to the rated safety factor of the spiral coal unloading mechanism 4, the spiral coal unloading mechanism 4 works normally.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A screw coal unloader, characterized in that: include: A bearing seat (1), wherein a feeding mechanism (12) is arranged inside the bearing seat (1), a moving wheel (2) is arranged at the bottom of the bearing seat (1), a telescopic mechanism (3) is arranged at the top of the bearing seat (1), a spiral coal unloading mechanism (4) is arranged on one side of the telescopic mechanism (3), and the spiral coal unloading mechanism (4) is connected to the bearing seat (1) through a coal transport pipe (5).

2. A screw coal unloader according to claim 1, characterized in that: A material transport cavity (11) is provided in the support seat (1), and the material feeding mechanism (12) comprises a transport belt (121), and the transport belt (121) is arranged in the material transport cavity (11). A first driving module is provided on the outer wall of the support seat (1), and the transport belt (121) is drivingly connected to the first driving module. A material feed port (122) is provided at the top of the support seat (1), and a scraper plate (123) is provided on one side of the material feed port (122). A material discharge port (124) is provided at the bottom of the support seat (1), and a material discharge pipe (125) is provided at the material discharge port (124).

3. A screw coal unloader according to claim 2, characterized in that: The telescopic mechanism (3) comprises a fixed seat (31), the fixed seat (31) being fixedly arranged on the top of the bearing seat (1), the fixed seat (31) being provided with a limit cavity (32) and a first driving cavity (33), the limit cavity (32) being provided with an interpenetrating column (34), the top and bottom of the interpenetrating column (34) being provided with limit clamps (35), respectively, the first driving cavity (33) being provided with a telescopic member (36), the telescopic end of the telescopic member (36) passing through the fixed seat (31) and being fixedly connected to the limit clamp (35) at the bottom of the interpenetrating column (34).

4. A screw coal unloader according to claim 3, characterized in that: The spiral coal unloading mechanism (4) comprises a lifting sleeve (41), one side of the lifting sleeve (41) is fixedly connected to one end of the insertion column (34), a coal pipe cavity (42) is vertically opened in the lifting sleeve (41), a coal unloading pipe (43) is inserted in the coal pipe cavity (42), a plurality of screws (44) are rotatably arranged at the top of the lifting sleeve (41), a limiting plate (45) is arranged on the outer wall of the coal unloading pipe (43), a limiting hole (46) is opened in the limiting plate (45), the screw (44) is inserted in the limiting hole (46), the outer wall of the screw (44) is connected to the inner wall of the limiting hole (46) by a thread, a clamping block (47) is arranged at the top of the screw (44), a first bevel gear (48) is arranged at the bottom of the screw (44), and the first bevel gear (48) is drivingly connected to the second driving module.

5. A screw coal unloader according to claim 4, characterized in that: A support plate (431) is arranged in the coal unloading pipe (43), and the support plate (431) separates the coal unloading pipe (43) into a coal unloading chamber (432) and a second driving chamber (433). A motor (434) is arranged in the second driving chamber (433). A rotating shaft (435) is vertically arranged in the coal unloading chamber (432), and a spiral blade (436) is arranged on the rotating shaft (435). The driving end of the motor (434) passes through the support plate (431) and is transmission-connected to the rotating shaft (435). A coal discharge port (437) is provided on the side wall of the coal unloading pipe (43) below the support plate (431).

6. A screw coal unloader according to claim 5, characterized in that: Both ends of the coal transport pipe (5) are respectively connected to the coal discharge port (437) and the material discharge port (124).

7. The screw coal unloader according to claim 6, characterized in that: Also includes: A power detection module, used for measuring the real-time output power of the motor (434); A rotation speed detection module, used to measure the rotation speed of the rotating shaft (435); A speed detection module, used to measure the discharge speed of coal from the coal discharge port (437); A height detection module 1 is used to measure the height between the upper coal discharge port (437) of the coal discharge chamber (432) and the ground; A second height detection module is used to measure the height of the bottom of the coal unloading chamber (432) from the ground; An alarm module, used for issuing an alarm; A calculation module 1, used for calculating the actual safety factor of the spiral coal unloading mechanism (4) based on the real-time output power of the motor (434); A processing module, used for comparing the actual safety factor of the spiral coal unloading mechanism (4) obtained by the calculation module 1 with the rated safety factor of the spiral coal unloading mechanism (4); The control module is configured to control the alarm module to sound an alarm and simultaneously control the screw coal unloading mechanism (4) to stop working when the actual safety factor of the screw coal unloading mechanism (4) is less than the rated safety factor of the screw coal unloading mechanism (4); and the screw coal unloading mechanism (4) to work normally when the actual safety factor of the screw coal unloading mechanism (4) is greater than or equal to the rated safety factor of the screw coal unloading mechanism (4).

8. The screw coal unloader according to claim 7, characterized in that: The calculation module 1 calculates based on the following formula 1: ； is the actual safety factor of the spiral coal unloading mechanism (4), is the real-time output power of the motor (434), is the rotation speed of the rotating shaft (435), is the pitch of the spiral blade (436), is the density of coal in the coal discharge pipe (43), is the filling factor of coal, is the vertical transport coefficient, is the radius of the spiral blade (436), is the radius of the inner wall of the coal discharge pipe (43), is the circumference of a circle, is the friction coefficient between the coal and the inner wall of the coal discharge pipe (43), is the friction coefficient between the coal and the spiral blade (436), is the discharge speed of coal from the coal discharge port (437), is the height of the upper coal discharge port (437) of the coal discharge chamber (432) from the ground, is the height of the bottom of the coal unloading chamber (432) from the ground, is the acceleration due to gravity.

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