Protective device for cutting head of coal mining heading machine

Abstract

The utility model belongs to the technical field of protection devices, and particularly relates to a coal mining heading machine cutting head protection device which comprises a driving arm, the output end of the driving arm is connected with a cutting head, a first installation sleeve frame and a second installation sleeve frame are arranged on the outer side of the driving arm in a sleeved mode, and sliding grooves are formed in the outer side of the first installation sleeve frame and the outer side of the second installation sleeve frame. A sliding block is slidably mounted on the inner side of the sliding groove, one end of the sliding block is fixed to the protective cover, a steering chamber is arranged at the end, located on the sliding groove, of the side face of the second mounting sleeve frame, a transmission screw is rotatably mounted on the inner side of the sliding groove and is in threaded connection with the sliding block, and one end of the transmission screw penetrates into the steering chamber and is rotatably connected with the steering chamber. One end of the transmission screw is fixed to the first bevel gear, a driving mechanism is rotationally installed on the inner side of the steering chamber, when the cutting head conducts tunneling, fragments generated in the tunneling process and splashing towards the rear portion of the cutting head can be effectively blocked, and the production safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of protection device, concretely relates to a coal mining heading machine cutting head protection device. BACKGROUND

[0002] The coal mining heading machine is a mechanical equipment for coal mining, and mainly functions to dig straight underground tunnels to improve the coal mining efficiency.

[0003] The cantilever type heading machine generally adopts a cutting head as a heading tool, and drills and cuts through the rotating cutting head, and the cutting head has a plurality of cutting teeth for breaking rocks and coal bodies in the heading process; in the heading process, with the rotation of the cutting teeth, when the rocks and coal bodies are cut, a part of them will splash towards the rear of the cutting head, and there is a certain safety risk; in order to improve the production safety, the utility model provides a coal mining heading machine cutting head protection device. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the utility model aims at providing a coal mining heading machine cutting head protection device, which can effectively block the splashing of the fragments towards the rear of the cutting head in the heading process, and improve the production safety.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a coal mining heading machine cutting head protection device, comprising a driving arm, the output end of the driving arm is connected with a cutting head, the outer side of the driving arm is sleeved with a first mounting sleeve and a second mounting sleeve, the outer side of the first mounting sleeve and the second mounting sleeve is provided with a sliding groove, the inner side of the sliding groove is slidably provided with a sliding block, one end of the sliding block is fixed with a protective cover, the side surface of the second mounting sleeve is provided with a steering chamber at one end of the sliding groove, the inner side of the sliding groove is rotatably provided with a transmission screw, the transmission screw is threadedly connected with the sliding block, one end of the transmission screw penetrates into the interior of the steering chamber and is rotatably connected therewith, one end of the transmission screw is fixed with a first bevel gear, the inner side of the steering chamber is rotatably provided with a driving mechanism, the outer side of the first mounting sleeve and the second mounting sleeve is sleeved with a connecting ring plate, the protective cover and the bottom of the driving arm are jointly provided with a cooling auxiliary device, the outer side of the protective cover is annularly provided with a first bearing seat, the outer side of the connecting ring plate is annularly provided with a second bearing seat, and the first bearing seat and the second bearing seat are jointly provided with a protective net and a supporting structure.

[0006] The utility model discloses beneficial effect for: the device is not used, the protection cover is protected to cutting head, the device is used, loosens the threaded locking sleeve, can rotate the handle, drives the rotation of the second bevel gear through handle driving pivot rotation, drives the rotation of the first bevel gear together with transmission screw through the second bevel gear, utilizes transmission screw and the transmission of sliding block between the drive sliding block together with the protection cover moves towards the steering chamber, makes cutting head expose, the protection cover moves in place, can be tightened threaded locking sleeve again, locks pivot and makes it unable to rotate, the first bearing seat is removed simultaneously with the protection cover, with the mutual approach between the first bearing seat and the second bearing seat, the first swing arm, the second swing arm of the connecting point of third bearing seat all rotate towards the outside direction of drive arm, the support effect of second swing arm is played through the first swing arm, with the rotation of second swing arm, the protective net passes through the groove and drives the protective net to unfold, because the limiting guide slot and limiting rubber strip that have the limiting ability between each other can slide each other, therefore can not influence the protective net that the protective net passes through the groove and drives the protective net to unfold while keeping the fixed ability of the one end of protective net to the one end of protective net, avoid the part of protective net that the protective net passes through the groove in the inside of the protective net that rotates towards the upper and oblique upper slides towards and influences the protection effect, through the second swing arm of unfolding cooperation protective net of unfolding, forms a funnel-shaped blocking net at the back of cutting head, can effectively block the fragment that generates towards the back of cutting head in the process of tunneling when cutting head is tunneling, improves production safety.

[0007] In the process of tunneling, the fan can be controlled to run, and the air flow is transported to the direction of the first annular flow divider through the hose, the air flow is uniformly transported into the second annular flow divider through the upper and lower two groups of air flow conveying pipes after entering the first annular flow divider, and is uniformly sprayed out through the nozzles on one side of the second annular flow divider, so that the air circulation speed around the cutting head is improved, and the heat dissipation and cooling speed of the cutting head are enhanced.

[0008] In order to transfer the heat of the power module:

[0009] As a further improvement of the above technical solution: the outer side of the drive arm is provided with a positioning groove, the inner arc surfaces of the first mounting sleeve frame and the second mounting sleeve frame are provided with positioning blocks, and the positioning blocks and the positioning groove are connected by insertion.

[0010] The beneficial effects of the improvement are that: through the cooperation between the positioning blocks and the positioning grooves, the first mounting sleeve frame and the second mounting sleeve frame can quickly determine the installation position and quickly align, and through the cooperation between the positioning blocks and the positioning grooves, the first mounting sleeve frame and the second mounting sleeve frame cannot rotate after installation, and can maintain a fixed state.

[0011] In order to cool the second heat-conducting plate:

[0012] As a further improvement of the above technical solution: the driving mechanism comprises a rotating shaft, a second bevel gear is fixedly sleeved on the outer side of the rotating shaft, the second bevel gear and the first bevel gear are in meshing connection, and one end of the rotating shaft penetrates through the outer side of the steering chamber and is fixedly connected with the steering handle.

[0013] The improved beneficial effect is that: the rotating shaft is driven to rotate by the steering handle, the second bevel gear is driven to rotate, the first bevel gear and the transmission screw are driven to rotate by the second bevel gear, the sliding block and the protective cover are driven to move along the sliding groove by the transmission between the transmission screw and the sliding block, so that the cutting head is covered by the protective cover, or the cutting head is exposed from the protective cover.

[0014] In order to circulate air and further seal the power module:

[0015] As a further improvement of the above technical solution: the part of the rotating shaft located outside the steering chamber is provided with external threads and is in threaded connection with a threaded locking sleeve.

[0016] The improved beneficial effect is that: the threaded locking sleeve is tightened, the rotating shaft is locked and cannot rotate.

[0017] In order to control the device:

[0018] As a further improvement of the above technical solution: the protective net and the supporting structure comprise a first rotating arm rotatably installed in the inner side of the first bearing seat and a second rotating arm rotatably installed in the inner side of the second bearing seat, one end of the first rotating arm is fixedly provided with a third bearing seat, the third bearing seat is in rotational connection between the second rotating arm, and the outer side of the second rotating arm is provided with a protective net passing groove, one end of the inner side of the protective net passing groove is fixed with one end of the protective net.

[0019] The improved beneficial effect is that: while the protective cover moves, the first bearing seat moves, the first rotating arm and the second rotating arm connected by the third bearing seat rotate towards the outer side or the inner side of the driving arm, the first rotating arm supports and drives the second rotating arm, the protective net is expanded by the rotation of the second rotating arm, and a funnel-shaped blocking net is formed at the rear side of the cutting head, which can effectively block the splashing of the fragments towards the rear of the cutting head during the tunneling process, and improve the production safety.

[0020] In order to place and charge the charging gun:

[0021] As a further improvement of the above technical solution: one end of the protective net passing groove is provided with a limiting guide groove, and one end of the protective net is provided with a limiting rubber strip, and the limiting guide groove and the limiting rubber strip are in sliding connection.

[0022] The beneficial effects of the improvement are that the limiting guide grooves and the limiting rubber strips limit each other, thereby limiting the end of the protective net that is not fixed through the groove, avoiding the movement of the end in the protective net passing through the groove without being restricted, which leads to the failure to complete the unfolding and folding of the protective net, and the limiting guide grooves and the limiting rubber strips are connected in sliding mode, thereby enabling the protective net to be unfolded and folded along with the unfolding or folding of the first rotating arm and the second rotating arm.

[0023] As a further improvement of the above technical solution: the first mounting sleeve frame and the second mounting sleeve frame, and the connecting ring plate and the first mounting sleeve frame and the second mounting sleeve frame are fixed through bolts.

[0024] In order to convey cooling water:

[0025] As a further improvement of the above technical solution: the cooling auxiliary device comprises an air flow conveying pipe mounted on the protective cover, one end of the air flow conveying pipe is fixedly connected with the first annular flow divider, the other end of the air flow conveying pipe is fixedly connected with the second annular flow divider, a plurality of nozzles are uniformly arranged on one side of the second annular flow divider, a fan mounting seat is arranged at the bottom of the driving arm, a fan is mounted at the bottom of the fan mounting seat, and the fan is connected with the first annular flow divider through a hose.

[0026] The beneficial effects of the improvement are that during the tunneling process, the fan can be controlled to run, air flow is conveyed through the hose towards the direction of the first annular flow divider, after the air flow enters the first annular flow divider, it is uniformly conveyed into the inside of the second annular flow divider through the upper and lower two groups of air flow conveying pipes, and is uniformly sprayed out through the nozzles on one side of the second annular flow divider, the circulation speed of the air around the cutting head is improved, and the effect of enhancing the heat dissipation and cooling speed of the cutting head is achieved.

[0027] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic view of the utility model when the protective cover is not opened (the protective net is not shown);

[0029] Figure 2 It is a schematic view of the utility model when the protective cover is opened (the protective net is not shown);

[0030] Figure 3 It is an isometric cut schematic view of the utility model (the protective net is not shown);

[0031] Figure 4 It is a sectional view schematic view of the utility model;

[0032] Figure 5 It is a local separation schematic view of the utility model;

[0033] Figure 6 It is the installation effect schematic view when the guard net of the utility model is unfolded;

[0034] Figure 7 It is the connection structure schematic view of the steering chamber and the transmission screw rod of the utility model;

[0035] In the drawing: 1, drive arm;2, cutting head;3, positioning groove;5, first mounting sleeve frame;6, second mounting sleeve frame;7, sliding groove;8, sliding block;9, transmission screw rod;10, steering chamber;11, first bevel gear;12, rotating shaft;13, second bevel gear;14, handle;15, threaded locking sleeve;16, connecting ring plate;17, protective cover;18, airflow conveying pipe;19, first annular shunt pipe;20, second annular shunt pipe;21, spray head;22, first bearing seat;23, first rotating arm;24, second bearing seat;25, second rotating arm;26, third bearing seat;27, guard net passes through groove;28, fan mounting seat;29, fan;30, positioning block;31, guard net;32, limiting guide groove;33, limiting rubber strip. DETAILED DESCRIPTION

[0036] In order to make the skilled in the art better understand the technical scheme of the present application, the present application will be described in detail below in conjunction with the drawings, the description of this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application.

[0037] As Figures 1-7 shown, a kind of coal winning machine cutting head protection device, including drive arm 1, the output end of the drive arm 1 is connected with cutting head 2, the outside of the drive arm 1 is equipped with first mounting sleeve frame 5, second mounting sleeve frame 6, the outside of the first mounting sleeve frame 5, second mounting sleeve frame 6 is equipped with sliding groove 7, the inside of the sliding groove 7 is slidably installed sliding block 8, one end of the sliding block 8 is fixed with protective cover 17, the side of the second mounting sleeve frame 6 is located in the one end of sliding groove 7 and is equipped with steering chamber 10, the inside of the sliding groove 7 is rotatably installed transmission screw rod 9, the transmission screw rod 9 is threadedly connected between sliding block 8, one end of the transmission screw rod 9 is penetrated into the inside of steering chamber 10 and is rotatably connected, one end of the transmission screw rod 9 is fixed with first bevel gear 11, the inside of the steering chamber 10 is rotatably installed drive mechanism, the outside of the first mounting sleeve frame 5, second mounting sleeve frame 6 is equipped with connecting ring plate 16, cooling auxiliary device is jointly installed on the protective cover 17 and the bottom of drive arm 1, the outside of the protective cover 17 is annularly distributed with first bearing seat 22, the outside of the connecting ring plate 16 is annularly distributed with second bearing seat 24, protective net and support structure are jointly installed on the first bearing seat 22, second bearing seat 24.

[0038] The device protects the cutting head 2 by the protective cover 17 when not in use, and when in use, the threaded locking sleeve 15 is loosened, the handle 14 is rotated, the shaft 12 is driven to rotate through the handle 14, the second bevel gear 13 is driven to rotate through the first bevel gear 11, the first bevel gear 11 and the transmission screw 9 are driven to rotate through the second bevel gear 13, the transmission screw 9 and the sliding block 8 are driven to move the sliding block 8 and the protective cover 17 towards the steering chamber 10, so that the cutting head 2 is exposed, and the threaded locking sleeve 15 is tightened again after the protective cover 17 is moved into position, the shaft 12 is locked and cannot rotate, the first bearing seat 22 is moved while the protective cover 17 is moving, the first and second rotating arms 23 and 25 connected by the third bearing seat 26 rotate towards the outside of the driving arm 1 as the first and second bearing seats 22 and 24 move closer to each other, the first rotating arm 23 supports the second rotating arm 25, and the protective net 31 is unfolded through the slot 27 as the second rotating arm 25 rotates, the limiting guide groove 32 and the limiting rubber strip 33 can limit the movement of the protective net 31 while allowing the movement of the protective net 31, so that the end of the protective net 31 can be fixed without affecting the unfolding of the protective net 31 through the slot 27, and the production safety is improved.

[0039] During the excavation process, the fan 29 can be controlled to run, and the air flow is transported towards the first annular shunt pipe 19 through the hose, the air flow is uniformly transported into the second annular shunt pipe 20 through the upper and lower two groups of air flow conveying pipes 18, and is uniformly sprayed out through the nozzle 21 on one side of the second annular shunt pipe 20, which improves the air circulation speed around the cutting head 2 and enhances the cooling and heat dissipation speed of the cutting head 2.

[0040] The outer side of the driving arm 1 is provided with a positioning groove 3, the inner arc surfaces of the first and second mounting sleeve frames 5 and 6 are provided with positioning blocks 30, and the positioning blocks 30 and the positioning groove 3 are connected by insertion.

[0041] Through the cooperation between the positioning blocks 30 and the positioning groove 3, the first and second mounting sleeve frames 5 and 6 can quickly determine the installation position and quickly align, and through the cooperation between the positioning blocks 30 and the positioning groove 3, the first and second mounting sleeve frames 5 and 6 cannot rotate after installation and can remain in a fixed state.

[0042] The driving mechanism comprises a rotating shaft 12, the outer side of the rotating shaft 12 is fixedly sleeved with a second bevel gear 13, the second bevel gear 13 and the first bevel gear 11 are engaged, and one end of the rotating shaft 12 penetrates out of the outer side of the steering chamber 10 and is fixedly connected with a steering handle 14.

[0043] The rotating shaft 12 is driven to rotate by the steering handle 14, the second bevel gear 13 is driven to rotate, the first bevel gear 11 is driven to rotate together with the transmission screw 9, the sliding block 8 is driven to move together with the protective cover 17 along the sliding groove 7 by the transmission between the transmission screw 9 and the sliding block 8, so that the cutting head 2 is covered by the protective cover 17 or the cutting head 2 is exposed from the protective cover 17.

[0044] The part of the rotating shaft 12 located outside the steering chamber 10 is provided with external threads and is threadedly connected with a threaded locking sleeve 15.

[0045] The threaded locking sleeve 15 is tightened, so that the rotating shaft 12 is locked and cannot rotate.

[0046] The protective net and support structure comprises a first rotating arm 23 rotatably installed in the inner side of a first bearing seat 22 and a second rotating arm 25 rotatably installed in the inner side of a second bearing seat 24, one end of the first rotating arm 23 is fixedly provided with a third bearing seat 26, the third bearing seat 26 is rotatably connected between the second rotating arm 25, and the outer side of the second rotating arm 25 is provided with a protective net passing groove 27, and one end of the protective net passing groove 27 is fixed with one end of a protective net 31.

[0047] When the protective cover 17 moves, the first bearing seat 22 is driven to move, the first rotating arm 23 and the second rotating arm 25 connected by the third bearing seat 26 are simultaneously rotated towards the outer side or the inner side of the driving arm 1 with the mutual approach or separation between the first bearing seat 22 and the second bearing seat 24, the first rotating arm 23 supports and drives the second rotating arm 25, the protective net 31 is unfolded with the rotation of the second rotating arm 25, and a funnel-shaped blocking net is formed at the rear side of the cutting head 2, so that the fragments splashed towards the rear of the cutting head 2 in the tunneling process can be effectively blocked, and the production safety is improved.

[0048] One end of the protective net passing groove 27 is provided with a limiting guide groove 32, and one end of the protective net 31 is provided with a limiting rubber strip 33, and the limiting guide groove 32 and the limiting rubber strip 33 are slidably connected.

[0049] The limiting guide groove 32 and the limiting rubber strip 33 limit each other, thereby limiting the end of the protective net 31 which is not fixed in the protective net passing groove 27, avoiding the movement of the end in the protective net passing groove 27, which leads to the failure of the unfolding and folding of the protective net 31. The limiting guide groove 32 and the limiting rubber strip 33 are slidingly connected, thereby enabling the protective net 31 to be unfolded and folded along with the unfolding or folding of the first rotating arm 23 and the second rotating arm 25.

[0050] The first mounting sleeve frame 5 and the second mounting sleeve frame 6 and the connecting ring plate 16 and the first mounting sleeve frame 5 and the second mounting sleeve frame 6 are fixed by bolts.

[0051] The cooling auxiliary device comprises the airflow conveying pipe 18 mounted on the protective cover 17, one end of the airflow conveying pipe 18 is fixedly connected with the first annular shunt pipe 19, the other end of the airflow conveying pipe 18 is fixedly connected with the second annular shunt pipe 20, the second annular shunt pipe 20 is uniformly provided with the spray head 21 on one side, the bottom of the driving arm 1 is provided with the fan mounting seat 28, the bottom of the fan mounting seat 28 is mounted with the fan 29, and the fan 29 is connected with the first annular shunt pipe 19 through the hose.

[0052] During the tunneling process, the fan 29 can be controlled to run, and airflow is conveyed towards the first annular shunt pipe 19 through the hose. After the airflow enters the first annular shunt pipe 19, it is uniformly conveyed into the second annular shunt pipe 20 through the upper and lower two groups of airflow conveying pipes 18, and is uniformly sprayed out through the spray head 21 on one side of the second annular shunt pipe 20, thereby improving the air circulation speed around the cutting head 2 and enhancing the heat dissipation and cooling speed of the cutting head 2.

[0053] The utility model discloses a working principle and use flow: the device is not used, through the protection cover 17 to the cutting head 2 protection, when using, loosens the threaded locking sleeve 15 after, can rotate the handle 14, through handle 14 drive pivot 12 rotation, thereby drive second bevel gear 13 rotation, through second bevel gear 13 drive first bevel gear 11 together with transmission screw rod 9 rotation, utilize transmission screw rod 9 and the transmission of sliding block 8 between drive sliding block 8 together with protection cover 17 move towards steering chamber 10, make cutting head 2 expose, protection cover 17 moves in position after, can again tighten threaded locking sleeve 15, lock pivot 12 so that it cannot rotate, with protection cover 17 moves, drive first bearing seat 22 to move, with the mutual approach between first bearing seat 22 and second bearing seat 24, with the first swing arm 23, second swing arm 25 of third bearing seat 26 as connecting point all rotate towards the outside direction of drive arm 1, through first swing arm 23 support second swing arm 25, with the rotation of second swing arm 25, the protective net passes through the slot 27 and drives the protective net 31 to unfold, because set up the limit position guide groove 32 and limit position rubber strip 33 with the limit ability between each other can slide each other, therefore can not affect the protective net 31 when the protective net passes through the slot 27 and drives the protective net 31 to unfold, while, the fixed ability of one end of protective net 31 is kept to the end of protective net, avoid the part of protective net 31 in the inside of protective net passing through the slot 27 and rotating towards the upper and oblique upper, and the sliding of the part towards the down is affected to the protection effect, through the unfolded second swing arm 25 cooperation unfolded protective net 31, form a funnel-shaped blocking net in the back side of cutting head 2, can effectively block the fragment that the cutting head 2 is generated in the process of tunneling and splashes towards the back of cutting head 2, improve production safety, in the process of tunneling, can control the operation of fan 29, through the hose towards the direction of first annular shunt pipe 19 and transports airflow, after airflow enters first annular shunt pipe 19, through the even delivery of the upper and lower two groups of airflow delivery pipe 18 into the inside of second annular shunt pipe 20, and even spray through the nozzle 21 of one side of second annular shunt pipe 20, improve the circulation speed of the air around cutting head 2, play the role of enhancing cutting head 2 heat dissipation and cooling speed, after stopping tunneling, can loosen threaded locking sleeve 15 again and reverse rotation pivot 12, thereby drive transmission screw rod 9 reverse rotation drive sliding block 8 towards the direction of cutting head 2 and move, further drive protection cover 17 re-cover the outside of cutting head 2 and protect it, while with the movement of protection cover 17, first swing arm 23, second swing arm 25 rotate reset, with the reset of second swing arm 25, protective net 31 restores to the state of folding.

[0054] Involve circuit and electronic components and module are prior art, and the person skilled in the art can realize without further ado, and the content protected in the application does not involve the improvement of software and method.

[0055] It should be noted that the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0056] The principles and implementation manners of the present application are described by using specific examples in the present application. The above example is only used to help understand the method and core idea of the present application. The above description is only the preferred implementation manner of the present application. It should be noted that due to the limited expression of the text, there are objectively infinite specific structures. For ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the present application. The above technical features can also be combined in an appropriate manner. These improvements, decorations, changes or combinations, or the direct application of the concept and technical solution of the present application to other occasions without improvement, should be regarded as the protection scope of the present application.

Claims

1. A coal mining machine cutting head guard, characterized by: The utility model provides a cutting head driving arm, including driving arm (1), the output end of driving arm (1) is connected with cutting head (2), the outside of driving arm (1) is equipped with first mounting sleeve frame (5), second mounting sleeve frame (6), the outside of first mounting sleeve frame (5), second mounting sleeve frame (6) is equipped with sliding slot (7), the inside of sliding slot (7) is slidably installed with sliding block (8), one end of sliding block (8) is fixed with protective cover (17), the side of second mounting sleeve frame (6) is located one end of sliding slot (7) and is equipped with steering chamber (10), the inside of sliding slot (7) is rotatably installed with transmission screw rod (9), transmission screw rod (9) is threadedly connected between sliding block (8), one end of transmission screw rod (9) is inserted into the inside of steering chamber (10) and is rotatably connected, one end of transmission screw rod (9) is fixed with first bevel gear (11), the inside of steering chamber (10) is rotatably installed with drive mechanism, the outside of first mounting sleeve frame (5), second mounting sleeve frame (6) is equipped with connecting ring plate (16), the bottom of protective cover (17) and driving arm (1) are jointly installed with cooling auxiliary device, the outside of protective cover (17) is annularly distributed and is equipped with first bearing seat (22), the outside of connecting ring plate (16) is annularly distributed and is equipped with second bearing seat (24), protective net and support structure are jointly installed on first bearing seat (22), second bearing seat (24).

2. A coal mining machine cutting head guard according to claim 1, characterised in that: The outside of driving arm (1) is equipped with positioning groove (3), the inner arc surface of first mounting sleeve frame (5), second mounting sleeve frame (6) is equipped with positioning block (30), the positioning block (30) and positioning groove (3) are inserted and connected.

3. A coal mining machine cutting head guard as claimed in claim 1, characterised in that: The drive mechanism includes a rotating shaft (12), the outer side of the rotating shaft (12) is fixedly sleeved with a second bevel gear (13), the second bevel gear (13) and the first bevel gear (11) are engaged, one end of the rotating shaft (12) penetrates out of the outer side of the steering chamber (10) and is fixedly connected with a handle (14).

4. A coal mining machine cutting head guard according to claim 3, characterised in that: The part of the rotating shaft (12) outside the steering chamber (10) is provided with external threads and is threadedly connected with a threaded locking sleeve (15).

5. A coal mining machine cutting head guard as claimed in claim 1, characterised in that: The protective net and support structure include a first rotating arm (23) rotatably installed inside the first bearing seat (22) and a second rotating arm (25) rotatably installed inside the second bearing seat (24), one end of the first rotating arm (23) is fixedly provided with a third bearing seat (26), the third bearing seat (26) is rotatably connected between the second rotating arm (25), the outer side of the second rotating arm (25) is provided with a protective net passing groove (27), one end of the inside of the protective net passing groove (27) is fixed with one end of a protective net (31).

6. A coal mining machine cutting head guard according to claim 5, characterised in that: One end of the protective net passing groove (27) is provided with a limiting guide groove (32), and one end of the protective net (31) is provided with a limiting rubber strip (33), the limiting guide groove (32) and the limiting rubber strip (33) are slidably connected.

7. A coal mining machine cutting head guard as claimed in claim 1, characterised in that: The first mounting sleeve frame (5) and the second mounting sleeve frame (6) are fixed by bolts.

8. A coal mining machine cutting head guard as claimed in claim 1, characterised in that: The cooling auxiliary device includes an air flow conveying pipe (18) installed on a protective cover (17), one end of the air flow conveying pipe (18) is fixedly connected with a first annular shunt pipe (19), the other end of the air flow conveying pipe (18) is fixedly connected with a second annular shunt pipe (20), a plurality of nozzles (21) are uniformly distributed on one side of the second annular shunt pipe (20), a fan mounting seat (28) is arranged at the bottom of the driving arm (1), a fan (29) is mounted at the bottom of the fan mounting seat (28), and the fan (29) is connected with the first annular shunt pipe (19) through a hose.

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