Hammer coal cutter

Abstract

This invention discloses a hammer-type coal cutter, comprising a trolley, a motor, and a cutting drum. The trolley includes a frame, handles, and wheels, with the handles and wheels connected to the frame. The motor is mounted on the frame. The cutting drum includes a drum shaft and several hammers. The drum shaft is rotatably mounted on the frame and extends horizontally. One end of each hammer is movably connected to the drum shaft. The motor drives the drum shaft to rotate. The hammer-type coal cutter disclosed in this invention has high coal cutting efficiency. Through the high-speed rotation of the cutting drum, the hammers repeatedly strike the coal at the bottom of the drum, peeling away the hard coal layer by layer, saving manpower. Furthermore, the hammer-type coal cutter has a simple and compact structure, small dimensions, and the cutting drum can extend to the bottom of the bottom conveyor belt for operation, making it suitable for use in narrow roadways.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a plate hammer coal cutter. Background Technology

[0002] Coal mine underground roadways are typically equipped with belt conveyors for transporting coal. Due to the high ground pressure in coal mines, roadway deformation frequently occurs, resulting in bulging. In some sections, the bulge is so large that it almost reaches the lower idler roller of the belt conveyor, affecting the normal transport of the conveyor. Therefore, it is necessary to remove the bulging coal seam from the roadway. However, due to the limited width of the roadway and the narrow space between the lower belt conveyor and the bulging coal seam, existing excavators, bulldozers, and other construction machinery cannot enter. The only option is to rely on manual labor, using picks and shovels to remove the bulging coal seam. Because of the confined space and limited range of motion, the only method of scraping coal is to swing the pick sideways, leading to low efficiency. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention propose a plate hammer coal cutter with high coal cutting efficiency, suitable for use in narrow roadways.

[0004] The hammer-type coal cutter of this invention includes: a trolley, the trolley including a frame, a handle and wheels, the handle and wheels being connected to the frame; an electric motor, the electric motor being mounted on the frame; and a cutting drum, the cutting drum including a drum shaft and a plurality of hammers, the drum shaft being rotatably mounted on the frame and extending horizontally, one end of the plurality of hammers being movably connected to the drum shaft, and the electric motor being used to drive the drum shaft to rotate.

[0005] The hammer-type coal cutter in this embodiment of the invention has high coal cutting efficiency. Through the high-speed rotation of the cutting drum, the hammer repeatedly strikes the coal at the bottom of the drum, peeling off the hard coal layer by layer, saving manpower. In addition, the hammer-type coal cutter has a simple and compact structure, small size, and the cutting drum can extend to the bottom of the bottom conveyor belt for construction work, making it suitable for use in narrow roadways.

[0006] In some embodiments, a motor pulley, a roller pulley, and a belt are provided, the output shaft of the motor is connected to the electrode pulley, the roller pulley is connected to one end of the roller shaft, and the belt is fitted onto each of the roller pulley and the motor pulley so that the motor drives the roller shaft to rotate.

[0007] In some embodiments, the coal cutting drum includes a first spoke, a second spoke, and a plurality of pins. The first spoke and the second spoke are spaced apart on the drum shaft and are axially opposite to each other on the drum shaft. A first end of each pin is connected to the first spoke, and a second end of each pin is connected to the second spoke. The plurality of pins are spaced apart circumferentially on the drum shaft. Each pin is provided with at least one hammer plate, which is rotatably mounted on the pin.

[0008] In some embodiments, one end of the hammer is provided with a through hole, the pin passes through the through hole and is rotatably disposed relative to the through hole; the coal cutting drum further includes a plurality of spacers, the spacers sleeve the pin and are used to separate the hammers, and at least one end of the spacer abuts against the hammer.

[0009] In some embodiments, the hammers on adjacent pins are staggered.

[0010] In some embodiments, the hammer cutter includes a connecting seat connected to the frame, and each of the electric motor and the cutting drum is connected to the connecting seat.

[0011] In some embodiments, the connecting seat includes a vertically arranged main board with a first through hole and a second through hole. The motor and the coal cutting drum are located on the same side of the main board, and the motor pulley and the drum pulley are located on the other side of the main board. The motor is connected to the motor pulley through the first through hole, and the drum shaft is connected to the drum pulley through the second through hole.

[0012] In some embodiments, the hammer cutter further includes a cover that covers the cutting drum from above and is connected to the connecting seat. The bottom of the cover is open so that the hammer extends from the bottom of the cover. The cutting drum includes a bearing, and the drum shaft is rotatably connected to the cover via the bearing.

[0013] In some embodiments, the motor pulley and the roller pulley are spaced apart in a first direction, the cover is provided with a first mounting hole, the connecting seat is provided with a second mounting hole, and the connecting bolt passes through the first mounting hole and the second mounting hole to connect the cover to the connecting seat. Either the first mounting hole or the second mounting hole is an elongated hole extending along the first direction.

[0014] In some embodiments, the bearing includes a first bearing and a second bearing that are axially opposite to the roller shaft, the cover includes an arc-shaped plate and a first side plate and a second side plate connected to the arc-shaped plate, one end of the roller shaft is connected to the first side plate through the first bearing, and the other end of the roller shaft is connected to the second side plate through the second bearing;

[0015] The connecting seat also includes a mounting plate that is parallel to the main board and spaced apart from the main board in the axial direction of the drum shaft. The mounting plate is closer to the coal cutting drum than the main board. The mounting plate is provided with a third through hole opposite to the second through hole, and the first bearing is supported at the third through hole. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the hammer-type coal cutter in an embodiment of the present invention. Figure 1 .

[0017] Figure 2 This is a schematic diagram of the structure of the hammer-type coal cutter in an embodiment of the present invention. Figure 2 .

[0018] Figure 3 This is a partial schematic diagram of a plate hammer coal cutter in an embodiment of the present invention.

[0019] Figure 4 This is a partial schematic diagram of a plate hammer coal cutter in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the coal cutting drum in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the connector structure in an embodiment of the present invention. Figure 1 .

[0022] Figure 7 This is a schematic diagram of the connector structure in an embodiment of the present invention. Figure 2 .

[0023] Figure 8 This is a schematic diagram of the structure of the protective cover in an embodiment of the present invention.

[0024] Figure label:

[0025] 1. Cart 11. Handlebar 12. Wheel 13. Axle

[0026] Electric motor 2

[0027] Coal cutting drum 3, drum shaft 31, hammer 32, first bearing 33, second bearing 34, first spoke 35, second spoke 36, pin 37, spacer 38.

[0028] Motor pulley 41, roller pulley 42, belt 43

[0029] Connector 5, main board 51, first through hole 511, second through hole 512, mounting plate 52, third through hole 521, second mounting hole 522, stiffening plate 53, U-shaped plate 54, vertical plate 55

[0030] Protective cover 6, arc plate 61, first side plate 62, first mounting hole 621, second side plate 63, groove 64, belt cover 7. Detailed Implementation

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] The following is based on Figures 1-8 The basic structure of the hammer-type coal cutter in this embodiment of the invention is described. The hammer-type coal cutter includes a trolley 1, a motor 2, and a cutting drum 3. The trolley 1 includes a frame, a handlebar 11, and wheels 12, all of which are connected to the frame. The motor 2 is mounted on the frame. The cutting drum 3 includes a drum shaft 31 and several hammers 32. The drum shaft 31 is rotatably mounted on the frame, and the motor 2 drives the drum shaft 31 to rotate. The drum shaft 31 extends horizontally. One end of each hammer 32 is movably connected to the drum shaft 31, while the other end is free. The movable connection of one end of each hammer 32 to the drum shaft 31 means that the hammer 32 can rotate circumferentially relative to the drum shaft 31; that is, the hammer 32 and the drum shaft 31 are not rigidly connected.

[0033] The working process of the hammer-type coal cutter is as follows: The pushcart 1 is used to push the hammer-type coal cutter to the position of the bottom coal layer. The handle 11 is pressed down, and the pushcart 1, supported by wheels 12, raises the cutting drum 3 so that the bottom hammer 32 is higher than the coal seam. Power is connected, and the motor 2 rotates, driving the cutting drum 3 to rotate. Under the action of centrifugal force, the outermost end (free end) of the hammer 32 rotates with its maximum rotation diameter, raising the handle 11 to the designated position. The cutting drum 3 then lowers, bringing the hammer 32 into contact with the coal seam. Under the striking action of the hammer 32, the raised coal seam in the cutting area is struck and removed, thereby stripping the coal seam. It should be noted that when using the hammer-type coal cutter provided in this embodiment to remove the coal seam below the bottom conveyor belt, the height of the cutting drum should be less than the distance from the bottom conveyor belt to the ground, allowing the cutting drum to reach the bottom of the bottom conveyor belt for operation.

[0034] The hammer-type coal cutter in this embodiment of the invention has high coal cutting efficiency. Through the high-speed rotation of the cutting drum, the hammer repeatedly strikes the coal at the bottom of the drum, peeling off the hard coal layer by layer, saving manpower. In addition, the hammer-type coal cutter has a simple and compact structure, small size, and the cutting drum can extend to the bottom of the bottom conveyor belt for construction work, making it suitable for use in narrow roadways.

[0035] Furthermore, since the hammer 32 is movably connected to the drum shaft 31, when the handle 11 is raised to a relatively large extent and the distance between the coal cutting drum 3 and the coal seam is relatively low, it is possible that the hammer 32 will be subjected to force and twist on its own if it fails to cut off the coal seam in one go. This will not affect the rotation of the coal cutting drum 3, allowing the coal cutting drum 3 to continue to work normally. Therefore, the hammer-type coal cutter in this embodiment of the invention has good adaptability.

[0036] like Figure 4 As shown, the frame includes an axle 13 and two wheels 12, which are rotatably connected to both ends of the axle 13. The axial direction of the roller shaft 31 is the same as that of the axle 13.

[0037] In some embodiments, the motor 2 drives the roller shaft 31 to rotate via a belt connection. Specifically, as shown in the figure... Figure 3 As shown, the hammer-type coal cutter includes a motor pulley 41, a drum pulley 42, and a belt 43. The output shaft of the motor 2 is connected to the motor pulley 41 for transmission. The drum pulley 42 is connected to one end of the drum shaft 31. The belt 43 is sleeved on each of the drum pulley 42 and the motor pulley 41. The output shaft of the motor 2 drives the motor pulley 41 to rotate. The drum pulley 42 transmits torque to the drum pulley 42 through the belt 43, and the drum pulley 42 drives the drum shaft 31 to rotate.

[0038] In some embodiments, the hammer-type coal cutter further includes a connecting seat 5, which is connected to the frame. Each of the motor 2 and the coal cutting drum 3 is connected to the connecting seat 5, that is, the motor 2 and the coal cutting drum 3 are connected to the frame through the connecting seat 5.

[0039] As an example, such as Figure 2 , 6 As shown in Figure 7, the connecting seat 5 is positioned near a wheel 12. The connecting seat 5 includes a main plate 51 and a reinforcing rib 53. The main plate 51 is vertically positioned and perpendicular to the axis of the roller shaft 31. The connecting seat 5 is connected to the axle 13 via the reinforcing rib 53.

[0040] The main board 51 has a first through hole 511 and a second through hole 512. The motor 2 and the coal cutting drum 3 are located on the same side of the main board 51, and the motor pulley 41 and the drum pulley 42 are located on the other side of the main board 51. Figure 2In the embodiment shown, the motor 2 and the coal cutting drum 3 are located inside the main board 51, and the motor pulley 41 and the drum pulley 42 are located outside the main board 51, so as to make the structure of the hammer coal cutter more compact and reasonable.

[0041] The motor 2 is connected to the motor pulley 41 through the first through hole 511, that is, the output shaft of the motor 2 passes through the first through hole 511 on the main board 51 and is connected to the motor pulley 41. Specifically, the flange end positioning frustum of the motor 2 can extend into the first through hole 511 for positioning. Several threaded holes for threaded connection with the flange of the motor 2 can be provided around the first through hole 511.

[0042] The roller shaft 31 is connected to the roller pulley 42 through the second through hole 512, that is, the roller shaft 31 passes through the second through hole 512 on the main board 51 and is connected to the roller pulley 42. It can be understood that the belt 43, the motor pulley 41, and the roller pulley 42 are located on the same side of the main board.

[0043] Furthermore, such as Figure 1 As shown, the hammer-type coal cutter also includes a protective cover 6, which covers the cutting drum 3 from above. The bottom of the protective cover 6 is open so that the hammer 32 can extend from the bottom of the protective cover 6. The protective cover 6 is used to prevent coal chunks kicked up by the rotating hammer 32 from splashing and injuring the operator. The protective cover 6 is connected to the connecting seat 5. The cutting drum 3 also includes bearings, and the drum shaft 31 is rotatably connected to the protective cover 6 via the bearings.

[0044] Specifically, such as Figure 8 As shown, the protective cover 6 has a semi-cylindrical structure, including an arc-shaped plate 61, a first side plate 62, and a second side plate 63. The first side plate 62 and the second side plate 63 are opposite each other in the axial direction of the protective cover 6 and are respectively connected to both ends of the arc-shaped plate 61. The first side plate 62 is connected to the connecting seat 5. The protective cover 6 is fastened above the coal cutting drum 3, and its axial direction is the same as the axial direction of the drum shaft 31.

[0045] The bearings include a first bearing 33 and a second bearing 34 axially opposed to each other on the roller shaft 31. The first bearing 33 is connected to the first side plate 62, and the second bearing 34 is connected to the second side plate 63. One end of the roller shaft 31 is connected to the first side plate 62 via the first bearing 33, and the other end of the roller shaft 31 is connected to the second side plate 63 via the second bearing 34. Figure 8 As shown, the bottom of the first side plate 62 and the bottom of the second side plate 63 are both provided with slots 64 for mounting bearings.

[0046] Optionally, both the first bearing 33 and the second bearing 34 are mounted bearings, which solves the problem of bearing lubrication.

[0047] Furthermore, to improve structural stability and rationality, and also to facilitate installation. For example... Figure 6and 7 As shown, the connecting seat 5 also includes a mounting plate 52. The mounting plate 52 is parallel to the main plate 51 and is spaced apart from the main plate 51 in the axial direction of the drum shaft 31. The mounting plate 52 is closer to the coal cutting drum 3 than the main plate 51, that is, the mounting plate 52 is located on the side of the main plate 51 closer to the coal cutting drum 3. The first side plate 62 of the protective cover 6 is connected to the mounting plate 52.

[0048] Specifically, such as Figure 6 and 7 As shown, the mounting plate 52 also includes a U-shaped plate 54 and a vertical plate 55 for connecting the motherboard 51 and the mounting plate 52. The extension directions of the U-shaped plate 54 and the vertical plate 55 are perpendicular to each other with respect to the motherboard 51 and the mounting plate 52. The U-shaped plate 54 and the vertical plate 55 are connected between the motherboard 51 and the mounting plate 52, making the connector 5 a whole.

[0049] The mounting plate 52 has a third through hole 521 opposite to the second through hole 512, and the first bearing 33 is supported at the third through hole 521. The roller shaft 31 passes through the first bearing 33 supported at the third through hole 521 and then passes through the second through hole 512 on the main plate 51 to connect with the roller pulley 42. The first bearing 33 being supported at the third through hole 521 can better prevent the roller shaft 31 from moving around. The third through hole 521 of the mounting plate 52 also serves to accommodate and allow the first bearing 33 to pass through, and there is a certain gap between the first bearing 33 and the roller pulley 42. The mounting plate 52 also allows the planes of the motor pulley 41 and the roller pulley 42 to be parallel to the main plate 51, making the structure more reasonable.

[0050] exist Figure 6 and 7 In the embodiment shown, the third through hole 521 on the mounting plate 52 and the second through hole 512 on the main plate 51 are both configured as slotted structures, that is, the front sides of the third through hole 521 and the second through hole 512 are open to form slots, which facilitates the installation of the coal cutting drum 3 and the first bearing 33.

[0051] Furthermore, such as Figure 3 As shown, the motor pulley 41 and the roller pulley 42 are spaced apart in the first direction, as... Figure 8 As shown, the first side plate 62 of the protective cover 6 is provided with a first mounting hole 621, such as Figure 7As shown, the mounting plate 52 has a second mounting hole 522. The connecting bolt passes through the first mounting hole 621 and the second mounting hole 522 to connect the protective cover 6 to the mounting plate 52. Either the first mounting hole 621 or the second mounting hole 522 is an elongated hole extending in the first direction. This allows adjustment of the relative position of the protective cover 6 and the connecting seat 5 in the first direction. Since the coal cutting roller 3 is connected to the protective cover 6, the relative position of the coal cutting roller 3 and the connecting seat 5 can be adjusted. Furthermore, since the roller pulley 42 is connected to the roller shaft 31, the relative position of the roller pulley 42 and the connecting seat 5 can be adjusted. The motor pulley 41 is fixed relative to the connecting seat 5. Therefore, by adjusting the relative position of the roller pulley 42 and the motor pulley 41 in the first direction, the belt 43 fitted on it can be tensioned.

[0052] When adjusting the protective cover 6, the first bearing 33 can also move along the slotted third through hole 521. Preferably, the third through hole 521 matches the size of the first bearing 33.

[0053] In some embodiments, such as Figure 4 and Figure 5 As shown, the coal cutting drum 3 includes a first spoke 35, a second spoke 36, and multiple pins 37. The first spoke 35 and the second spoke 36 are spaced apart on the drum shaft 31 and are axially opposite to each other on the drum shaft 31. The first spoke 35 and the second spoke 36 are fixed relative to the drum shaft 31 and rotate with the rotation of the drum shaft 31. The first end of the pin 37 is connected to the first spoke 35, and the second end of the pin 37 is connected to the second spoke 36. The multiple pins 37 are spaced apart circumferentially along the drum shaft 31. Figure 4 and Figure 5 In the illustrated embodiment, the pins 37 and the roller shaft 31 are parallel to each other. Each pin 37 is provided with at least one hammer 32, which is rotatably mounted on the pin 37, meaning that the hammer 32 and the pin 37 are movably connected. The rotation of the roller shaft 31 causes the pins 37 to rotate around it, thereby causing the hammers 32 to rotate around the roller shaft 31.

[0054] As an example, such as Figure 5 As shown, one end of the hammer 32 is provided with a through hole, and the pin 37 passes through the through hole on the hammer 32 and is rotatably arranged relative to the through hole. That is to say, the hammer 32 can rotate around the pin 37 with the central axis of the pin 37 as the axis of rotation, and it can also revolve around the central axis of the roller shaft 31 under the action of the roller shaft 31.

[0055] exist Figure 5 In the embodiment shown, multiple hammers 32 are spaced apart on each pin 37. The hammers 32 on adjacent pins 37 are staggered to improve the coal cutting effect of the coal cutting drum 3 and to prevent the hammers 32 from interfering with each other during swinging motion.

[0056] Furthermore, in order to relatively fix the position of the hammer 32 in the axial direction, such as Figure 5 As shown, the coal cutting drum 3 also includes several spacers 38, each spacer 38 fitted with a pin 37, and at least one end of the spacer 38 abuts against a hammer 32. The spacers 38 are used to separate the hammers 32, preventing the hammers 32 from moving axially along the pin 37 during rotation. The number and length of the spacers 38 can be designed according to the number and spacing of the hammers 32 on the pin 37.

[0057] In some embodiments, such as Figure 2 As shown, the hammer-type coal cutter also includes a belt cover 7, which covers the outside of the motor pulley 41, the drum pulley 42, and the belt 43, and is connected to the side of the main board 51 away from the motor 2, for the purpose of protecting the motor pulley 41, the drum pulley 42, and the belt 43.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A hammer-type coal cutter, characterized in that, include: A cart, the cart including a frame, a handlebar and wheels, the handlebar and the wheels being connected to the frame; An electric motor, which is mounted on the vehicle frame; and A coal cutting drum, comprising a drum shaft and several hammers, wherein the drum shaft is rotatably mounted on the frame and extends horizontally, one end of each hammer is movably connected to the drum shaft, and the motor is used to drive the drum shaft to rotate; The coal cutting drum includes a first spoke, a second spoke, and a plurality of pins. The first spoke and the second spoke are spaced apart on the drum shaft and are axially opposite to each other on the drum shaft. The first end of each pin is connected to the first spoke, and the second end of each pin is connected to the second spoke. The plurality of pins are spaced apart circumferentially on the drum shaft. Each pin is provided with at least one hammer plate, and the hammer plate is rotatably mounted on the pin plate. One end of the hammer is provided with a through hole, and the pin passes through the through hole and is rotatably disposed relative to the through hole; The hammers on adjacent pins are staggered. Includes a connecting seat, which is connected to the frame, and each of the electric motor and the coal cutting drum is connected to the connecting seat; The system includes a motor pulley, a drum pulley, and a belt. The connecting seat includes a vertically arranged main plate with a first through hole and a second through hole. The motor and the coal cutting drum are located on the same side of the main plate, and the motor pulley and the drum pulley are located on the other side of the main plate. The motor is connected to the motor pulley through the first through hole, and the drum shaft is connected to the drum pulley through the second through hole.

2. The hammer-type coal cutter according to claim 1, characterized in that, Also includes: The output shaft of the motor is connected to the motor pulley, the roller pulley is connected to one end of the roller shaft, and the belt is sleeved on each of the roller pulley and the motor pulley so that the motor drives the roller shaft to rotate.

3. The hammer-type coal cutter according to claim 1, characterized in that, The coal cutting drum also includes several spacers, each spacer sleeved with the pin shaft to separate the hammers, and at least one end of each spacer abuts against the hammers.

4. The hammer-type coal cutter according to claim 1, characterized in that, It also includes a protective cover that covers the coal cutting drum from above and is connected to the connecting seat. The bottom of the protective cover is open so that the hammer can extend from the bottom of the protective cover. The coal cutting drum includes a bearing, and the drum shaft is rotatably connected to the protective cover via the bearing.

5. The hammer-type coal cutter according to claim 4, characterized in that, The motor pulley and the roller pulley are spaced apart in a first direction. The cover has a first mounting hole and the connecting seat has a second mounting hole. The connecting bolt passes through the first mounting hole and the second mounting hole to connect the cover to the connecting seat. Either the first mounting hole or the second mounting hole is an elongated hole extending along the first direction.

6. The hammer-type coal cutter according to claim 4, characterized in that, The bearing includes a first bearing and a second bearing that are axially opposite to each other on the roller shaft. The cover includes an arc-shaped plate and a first side plate and a second side plate connected to the arc-shaped plate. One end of the roller shaft is connected to the first side plate through the first bearing, and the other end of the roller shaft is connected to the second side plate through the second bearing. The connecting seat also includes a mounting plate that is parallel to the main board and spaced apart from the main board in the axial direction of the drum shaft. The mounting plate is closer to the coal cutting drum than the main board. The mounting plate is provided with a third through hole opposite to the second through hole, and the first bearing is supported at the third through hole.

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