A replacement device for replacing the cutting teeth of a coal mining machine

Abstract

This invention relates to the field of coal mining machine cutting tooth replacement technology, and more particularly to a replacement device for replacing coal mining machine cutting teeth. A replacement device for replacing coal mining machine cutting teeth includes a clamping mechanism, a prying mechanism, and a striking mechanism. The clamping mechanism is clamped onto the tooth holder. The prying mechanism includes a first telescopic cylinder and a prying tooth assembly, the prying tooth assembly being located on the side of the clamping mechanism facing the cutting tooth, with the prying tooth end of the prying tooth assembly facing the annular gap and capable of extending into the annular gap. The two ends of the first telescopic cylinder are respectively hinged to the top of the clamping mechanism and the top of the prying tooth assembly. The striking mechanism is mounted on the clamping mechanism, with its striking end facing the cutting tooth. The clamping mechanism can firmly clamp onto the tooth holder, and the prying tooth end of the prying tooth assembly loosens the connection between the cutting tooth and the tooth holder, thus prying the cutting tooth. The striking mechanism can repeatedly strike the cutting tooth to be installed into the tooth holder, improving the efficiency and safety of cutting tooth replacement and reducing labor intensity.

Description

Technical Field

[0001] This invention relates to the field of coal mining machine cutting tooth replacement technology, and in particular to a replacement device for replacing coal mining machine cutting teeth. Background Technology

[0002] Coal mining machine cutting teeth are core, easily worn cutting components in coal mining machines and tunnel boring machinery. They are mainly installed on the tooth seats of the coal mining machine drum and are key tools for completing coal cutting and crushing operations. Their performance directly determines the production efficiency, power consumption, working stability, and service life of related parts of the coal mining machinery.

[0003] During fully mechanized coal mining operations, the cutting teeth of the coal mining machine come into direct contact with the coal and rock, and are subjected to severe impact, friction and compression over a long period of time. They are prone to failure such as detachment of the cutting head, chipping, wear or breakage of the cutting body. Therefore, it is necessary to disassemble and replace the failed cutting teeth regularly to ensure the normal operation of the coal mining machine and the continuity of coal mining operations, and to avoid the occurrence of reduced coal mining efficiency, equipment failure or even safety accidents due to the failure of the cutting teeth.

[0004] Currently, in the replacement of cutting picks in fully mechanized coal mining faces, due to the confined working space and complex working environment, most operations rely on the traditional hammer-based method for disassembly and installation. This involves repeatedly striking the pick with a hammer to gradually dislodge it from its holder. For installation, the new pick is slowly inserted into the mounting hole of the holder, then hammered until it is securely in place and will not loosen or fall off during mining operations. Finally, retaining clips and other fasteners are installed to complete the replacement. However, this process requires prolonged hammering, resulting in high labor intensity, low efficiency, and potential safety risks such as tool slippage and debris flying during hammering.

[0005] Therefore, there is an urgent need for a replacement device that can reduce the labor intensity of workers, improve labor efficiency and safety when changing cutting teeth. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a replacement device for replacing the cutting teeth of a coal mining machine, which solves the technical problems of high labor intensity, low replacement efficiency, and low safety of the replacement process caused by the need for manual disassembly and installation of the cutting teeth with a hammer.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0010] This invention provides a replacement device for replacing cutting teeth of a coal mining machine. The cutting teeth are coaxially inserted into the tooth holder of the coal mining machine, with an annular gap between them. The replacement device includes a clamping mechanism, a prying mechanism, and a striking mechanism. The clamping mechanism is clamped onto the tooth holder. The prying mechanism includes a first telescopic cylinder and a prying tooth assembly. The prying tooth assembly is located on the side of the clamping mechanism facing the cutting teeth, and the prying tooth end of the prying tooth assembly faces the annular gap and can extend into the annular gap. The two ends of the first telescopic cylinder are respectively hinged to the top of the clamping mechanism and the top of the prying tooth assembly. The telescopic end of the first telescopic cylinder can drive the prying tooth assembly to rotate around its hinge axis with the clamping mechanism toward the tooth holder, so that the prying tooth end of the prying tooth assembly can pry the cutting teeth away from the tooth holder. The striking mechanism is mounted on the clamping mechanism, and its striking end faces the cutting teeth, used to strike the cutting teeth to be installed until they are inserted into the tooth holder.

[0011] Preferably, the prying assembly further includes a mounting plate, which is arranged laterally, with one end connected to the clamping mechanism and the other end extending toward the prying tooth assembly. The prying tooth assembly includes a second telescopic cylinder and a prying member. The fixed end of the second telescopic cylinder is hinged to the mounting plate on the side facing the clamping mechanism, and the telescopic end of the second telescopic cylinder passes through the mounting plate and is arranged toward the annular gap. The prying member is detachably connected to the telescopic end of the second telescopic cylinder, and the telescopic end of the second telescopic cylinder can drive the prying member to repeatedly extend into the annular gap. The prying member is the prying tooth end of the prying tooth assembly. The telescopic end of the first telescopic cylinder is hinged to the fixed end of the second telescopic cylinder away from the mounting plate, so that the telescopic end of the second telescopic cylinder can drive the second telescopic cylinder and the prying member to rotate synchronously around the hinge axis between the second telescopic cylinder and the mounting plate.

[0012] Preferably, the prying member is U-shaped with its opening facing the annular gap, and the cross-section of the prying member is trapezoidal with the short side of the trapezoid facing the annular gap.

[0013] Preferably, the mounting plate has an elongated hole arranged along the axis of the cutting tooth, and the telescopic end of the second telescopic cylinder passes through the elongated hole, which can provide redundant rotation for the telescopic end of the second telescopic cylinder.

[0014] Preferably, the striking mechanism includes a striking plate and two third telescopic cylinders; the striking plate is located on the side of the cutting tooth away from the tooth holder and is arranged perpendicular to the axis of the cutting tooth, and the striking plate is the striking end; the two third telescopic cylinders are respectively located on both sides of the cutting tooth, and their axes are parallel to the axis of the cutting tooth; the fixed ends of the two third telescopic cylinders are connected to the clamping mechanism through a connecting plate, and the telescopic ends of the two third telescopic cylinders are connected to the striking plate; the telescopic ends of the two third telescopic cylinders can extend and retract synchronously, so as to drive the striking plate to repeatedly strike the cutting tooth to be installed inserted into the tooth holder.

[0015] Preferably, the striking plate has a circular groove on the side facing the cutting tooth, and the circular groove is coaxial with the cutting tooth.

[0016] Preferably, the clamping mechanism includes a drive assembly, a slide rail, and two clamping blocks; the slide rail is located above the tooth holder, and the centerline of the slide rail along its own length direction is perpendicular to the axis of the cutting tooth; the drive assembly is mounted on the slide rail and is arranged along the length direction of the slide rail; the two clamping blocks are spaced apart along the length direction of the slide rail and located on both sides of the tooth holder, and both clamping blocks extend into the slide rail and are connected to the drive assembly for transmission; the drive assembly can drive the two clamping blocks to move synchronously towards or away from each other along the length direction of the slide rail to clamp or disengage the clamping mechanism from the tooth holder; the fixed end of the first telescopic cylinder is hinged to the top of the slide rail, and the two connecting plates are connected to the side of the slide rail facing the cutting tooth.

[0017] Preferably, the driving assembly includes a driving member and a bidirectional threaded rod; the bidirectional threaded rod is rotatably mounted inside the slide rail along its length direction, and the two clamping blocks extend into the slide rail at their ends facing the slide rail and are screwed to the bidirectional threaded rod; the fixed end of the driving member is mounted on one side of the slide rail along its length direction, and the driving end of the driving member passes through the slide rail and connects to one end of the bidirectional threaded rod; the driving end of the driving member can drive the bidirectional threaded rod to rotate, thereby driving the two clamping blocks to move synchronously towards or away from each other along the axis of the bidirectional threaded rod.

[0018] Preferably, the toothed seat is a cylindrical structure, and the opposite sidewalls of the two clamping blocks are arc-shaped structures that conform to the outer contour of the toothed seat.

[0019] Preferably, the toothed seat has a protrusion in the middle; the arc-shaped structure has a positioning groove corresponding to the protrusion, which is used to position the clamping mechanism on the toothed seat.

[0020] (III) Beneficial Effects

[0021] The beneficial effects of this invention are:

[0022] This invention discloses a replacement device for replacing cutting teeth on a coal mining machine. By incorporating a clamping mechanism, a prying mechanism, and a striking mechanism, the clamping mechanism securely clamps the cutting tooth onto the tooth holder, providing stable support for the entire replacement device during the replacement process and preventing wobbling or displacement. The prying mechanism includes a first telescopic cylinder and a prying tooth assembly. The prying tooth end of the prying tooth assembly can repeatedly extend into the annular gap between the cutting tooth and the tooth holder, thereby widening the annular gap and loosening the connection between the cutting tooth and the tooth holder. Simultaneously, the telescopic end of the first telescopic cylinder can drive the prying tooth assembly to rotate around its hinge axis with the clamping mechanism towards the tooth holder. Using the hinge point between the prying tooth assembly and the clamping mechanism as a fulcrum, the prying tooth end of the prying tooth assembly can pry the cutting tooth away from the tooth holder, gradually prying it out of the tooth holder and detaching it from the tooth holder. This achieves rapid loosening and disassembly of the old cutting tooth, improving the disassembly efficiency. The striking mechanism is installed on the clamping mechanism. Its striking end can stably and evenly strike the cutting tooth to be installed into the tooth holder repeatedly, ensuring that the cutting tooth is installed in place and fixed firmly. This avoids the safety hazards such as tool slippage and flying debris that may occur when manually striking with a hand hammer. It improves the efficiency and safety of cutting tooth replacement and reduces the labor intensity of workers and the safety risks during the replacement process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the prying mechanism of the replacement device for replacing coal mining machine cutting teeth, when the prying tooth end loosens the tooth seat and the cutting tooth.

[0024] Figure 2 This is a schematic diagram of the overall three-dimensional structure of a replacement device for replacing coal mining machine cutting teeth, according to the present invention, when the cutting teeth and the cutting tooth holder are engaged.

[0025] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the prying mechanism of the replacement device for replacing coal mining machine cutting teeth according to the present invention when the cutting teeth are prying.

[0026] Figure 4 This is a schematic diagram of the overall three-dimensional structure of the striking mechanism of the replacement device for replacing coal mining machine cutting teeth according to the present invention, when striking the cutting teeth to be installed.

[0027] Figure 5 This is a schematic diagram of the overall three-dimensional disassembly structure of a replacement device for replacing coal mining machine cutting teeth according to the present invention.

[0028] Figure 6 This is a schematic diagram of the overall three-dimensional disassembly structure of the clamping mechanism of a replacement device for replacing coal mining machine cutting teeth according to the present invention.

[0029] Figure 7 This is a schematic diagram of the overall three-dimensional disassembly structure of the prying component of a replacement device for replacing coal mining machine cutting teeth according to the present invention.

[0030] [Explanation of Labels in the Attached Image]

[0031] 1: Cutting tooth; 2: Tooth seat; 21: Protrusion; 3: Clamping mechanism; 31: Drive assembly; 311: Drive component; 312: Bidirectional threaded rod; 32: Slide rail; 33: Clamping block; 331: Arc structure; 332: Positioning groove; 4: Prying mechanism; 41: First telescopic cylinder; 42: Prying tooth assembly; 421: Second telescopic cylinder; 422: Prying component; 43: Mounting plate; 431: Long hole; 5: Striking mechanism; 51: Striking plate; 511: Circular groove; 52: Third telescopic cylinder; 6: Connecting plate; 7: Handle; a: Annular interval. Detailed Implementation

[0032] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0033] Example

[0034] This embodiment provides a replacement device for replacing the cutting teeth of a coal mining machine, such as... Figure 2 As shown, the cutting tooth 1 is coaxially inserted with the tooth seat 2 of the coal mining machine and there is an annular gap a between them. The replacement device includes a clamping mechanism 3, a prying mechanism 4 and a striking mechanism 5.

[0035] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, the clamping mechanism 3 is clamped onto the tooth base 2. The prying mechanism 4 includes a first telescopic cylinder 41 and a prying tooth assembly 42. The prying tooth assembly 42 is located on the side of the clamping mechanism 3 facing the cutting tooth 1. The prying tooth end of the prying tooth assembly 42 faces the annular gap a and can extend into the annular gap a to widen the annular gap a. The two ends of the first telescopic cylinder 41 are hinged to the top of the clamping mechanism 3 and the top of the prying tooth assembly 42, respectively. The telescopic end of the first telescopic cylinder 41 can drive the prying tooth assembly 42 to rotate around its hinge axis with the clamping mechanism 3 toward the tooth base 2, so that the prying tooth end of the prying tooth assembly 42 can pry the cutting tooth 1 away from the tooth base 2. The striking mechanism 5 is mounted on the clamping mechanism 3, and its striking end faces the cutting tooth 1. It is used to strike the cutting tooth 1 to be installed until it is inserted into the tooth base 2. The striking mechanism 5 is only used when installing the cutting tooth 1 to be installed.

[0036] By setting up a clamping mechanism 3, a prying mechanism 4, and a striking mechanism 5, the clamping mechanism 3 can be firmly clamped onto the tooth holder 2, providing stable support for the entire replacement device during the replacement of the cutting tooth 1, and preventing the replacement device from shaking or shifting during the replacement process. The prying mechanism 4 includes a first telescopic cylinder 41 and a prying tooth assembly 42. The prying tooth end of the prying tooth assembly 42 can extend into the annular gap a between the cutting tooth 1 and the tooth holder 2, thereby widening the annular gap a and loosening the connection between the cutting tooth 1 and the tooth holder 2. At the same time, the telescopic end of the first telescopic cylinder 41 can drive the prying tooth assembly 42 to rotate around its hinge axis with the clamping mechanism 3 toward the tooth holder 2, so that the hinge point between the prying tooth assembly 42 and the clamping mechanism 3 is the fulcrum, and the prying tooth end of the prying tooth assembly 42 can pry the cutting tooth 1 away from the tooth holder 2, so as to gradually pry the cutting tooth 1 out of the tooth holder 2 and detach it from the tooth holder 2, thereby realizing the rapid loosening and disassembly of the old cutting tooth 1 and improving the disassembly efficiency of the cutting tooth 1. The striking mechanism 5 is installed on the clamping mechanism 3. Its striking end can stably and evenly strike the cutting tooth 1 to be installed into the tooth holder 2 repeatedly, ensuring that the cutting tooth 1 to be installed is installed in place and fixed firmly, so as to avoid the safety hazards such as tool slippage and debris flying when manually striking with a hammer. This improves the efficiency and safety of replacing the cutting tooth 1, and reduces the labor intensity of the workers and the safety risks during the replacement process.

[0037] Furthermore, such as Figure 1 and Figure 3As shown, it also includes a mounting plate 43, which is arranged horizontally. One end of the mounting plate 43 is connected to the clamping mechanism 3, and the other end extends toward the prying tooth assembly 42. The prying tooth assembly 42 includes a second telescopic cylinder 421 and a prying member 422. The fixed end of the second telescopic cylinder 421 is hinged to the mounting plate 43 on the side facing the clamping mechanism 3. The telescopic end of the second telescopic cylinder 421 passes through the mounting plate 43 and is positioned toward the annular gap a. The prying member 422 is detachably connected to the telescopic end of the second telescopic cylinder 421. The telescopic end of the second telescopic cylinder 421 can drive the prying member 422 to repeatedly extend into the annular gap a, thereby gradually widening the annular gap a through the prying member 422 to loosen the insertion of the cutting tooth 1 and the tooth seat 2. The prying member 422 is the prying tooth end of the prying tooth assembly 42. The telescopic end of the first telescopic cylinder 41 is hinged to the fixed end of the second telescopic cylinder 421 away from the mounting plate 43. This allows the telescopic end of the second telescopic cylinder 421 to drive the second telescopic cylinder 421 and the prying member 422 to rotate synchronously around the hinge axis between the second telescopic cylinder 421 and the mounting plate 43. Using the hinge point between the second telescopic cylinder 421 and the mounting plate 43 as a fulcrum, the prying member 422 can pry the cutting tooth 1 away from it, thus eliminating the need for manual prying and improving the disassembly efficiency of the cutting tooth 1. Furthermore, the prying member 422 is detachably connected to the telescopic end of the second telescopic cylinder 421 via bolts and nuts, facilitating the replacement of the prying member 422. This allows for quick replacement of the prying member 422 if it is damaged after repeated prying of the cutting tooth 1, further improving the replacement efficiency of the prying member 422.

[0038] It should be noted that the first telescopic cylinder 41 in this embodiment can be a small electric telescopic rod with compact dimensions and a small overall volume to fit the spacing between the cutting teeth 1 in the coal mining machine and avoid interference with other cutting teeth 1. The second telescopic cylinder 421 can be a small high-frequency vibration electric telescopic cylinder with a motor with a built-in vibration module. This allows the second telescopic cylinder 421 to not only repeatedly drive the prying member 422 into the annular gap a and widen the annular gap a, but also to achieve high-frequency vibration. This assists the prying member 422 in better extending into the annular gap a and widening the annular gap through vibration, further accelerating the loosening of the cutting teeth 1 and the tooth seat 2.

[0039] Furthermore, such as Figure 3 and Figure 7As shown, the prying member 422 is U-shaped, with its opening facing the annular interval a. The cross-section of the prying member 422 is trapezoidal, with the short side of the trapezoid facing the annular interval a. This allows the short side of the prying member 422 to smoothly extend into the annular interval a between the cutting tooth 1 and the tooth seat 2. Utilizing the characteristic that the trapezoidal cross-section gradually widens from the short side to the long side, when the second telescopic cylinder 421 drives the prying member 422 to repeatedly extend into the annular interval a, the prying member 422 can gradually widen the annular interval a, thereby loosening the cutting tooth 1 and the tooth seat 2, achieving rapid loosening of the cutting tooth 1, and improving the loosening efficiency of the cutting tooth 1.

[0040] Furthermore, such as Figure 5 As shown, an elongated hole 431 is provided on the mounting plate 43. The elongated hole 431 is set along the axis of the cutting tooth 1. The telescopic end of the second telescopic cylinder 421 passes through the elongated hole 431. The elongated hole 431 can provide redundant rotation for the telescopic end of the second telescopic cylinder 421 to adapt to the positional offset generated when the prying tooth assembly 42 rotates around the hinge axis during the process of prying the cutting tooth 1. This avoids interference and jamming between the telescopic end of the second telescopic cylinder 421 and the mounting plate 43, and improves the smoothness of the prying mechanism 4 in prying the cutting tooth 1.

[0041] Furthermore, such as Figure 4 As shown, the striking mechanism 5 includes a striking plate 51 and two third telescopic cylinders 52. The striking plate 51 is located on the side of the cutting tooth 1 away from the tooth holder 2 and is arranged perpendicular to the axis of the cutting tooth 1, with the striking plate 51 serving as the striking end. The two third telescopic cylinders 52 are located on both sides of the cutting tooth 1, with their axes parallel to the axis of the cutting tooth 1. The fixed ends of the two third telescopic cylinders 52 are connected to the clamping mechanism 3 via a connecting plate 6, and the telescopic ends of the two third telescopic cylinders 52 are connected to the striking plate 51. The telescopic ends of the two third telescopic cylinders 52 can extend and retract synchronously, enabling the striking plate 51 to repeatedly strike the cutting tooth 1 inserted into the tooth holder 2. This ensures that the striking plate 51 applies a uniform impact force to the cutting tooth 1 to be installed, guaranteeing that the cutting tooth 1 is installed in place and firmly fixed, improving the stability and efficiency of the cutting tooth 1 installation, and reducing the risk of installation misalignment and chipping of the cutting tooth 1 caused by manual striking.

[0042] It should be noted that the third telescopic cylinder 52 in this embodiment can be a small high-speed reciprocating electric telescopic rod. It achieves a stroke adaptive effect through the motor with built-in vibration module and stroke sensor (such as Hall sensor). As the cutting tooth 1 is gradually inserted into the tooth seat 2, the retraction stroke of the third telescopic cylinder 52 is gradually lengthened through the stroke adjustment function of the third telescopic cylinder 52, so as to always maintain effective contact between the striking plate 51 and the end of the cutting tooth 1, and ensure that the striking force is continuously applied to the cutting tooth 1 until the cutting tooth 1 is installed in place and fixed firmly.

[0043] Furthermore, such as Figure 4 and Figure 5As shown, the striking plate 51 has a circular groove 511 on the side facing the cutting tooth 1. The circular groove 511 is coaxial with the cutting tooth 1, which can achieve precise positioning of the end of the new cutting tooth 1, so as to avoid the striking plate 51 slipping or the cutting tooth 1 being deviated by force during the striking process, thereby improving the accuracy and stability of the installation of the cutting tooth 1.

[0044] Furthermore, such as Figure 4 and Figure 5 As shown, the clamping mechanism 3 includes a drive assembly 31, a slide rail 32, and two clamping blocks 33. The slide rail 32 is located above the tooth holder 2, and its centerline along its length is perpendicular to the axis of the cutting tooth 1. The drive assembly 31 is mounted on the slide rail 32 and is arranged along the length of the slide rail 32. The two clamping blocks 33 are spaced apart along the length of the slide rail 32 and are located on both sides of the tooth holder 2. Both clamping blocks 33 extend into the slide rail 32 and are connected to the drive assembly 31 for transmission. The drive assembly 31 can drive the two clamping blocks 33 to move synchronously towards or away from each other along the length of the slide rail 32 to clamp or release the clamping mechanism 3 onto the tooth holder 2. This ensures that the clamping mechanism 3 is stably and firmly clamped onto the tooth holder 2, preventing the entire replacement device from loosening during the replacement of the cutting tooth 1. Furthermore, the clamping mechanism 3 can stably clamp onto tooth holders 2 of different sizes to adapt to various specifications of tooth holders 2 and cutting teeth 1, improving the versatility and clamping stability of the replacement device. Among them, the fixed end of the first telescopic cylinder 41 is hinged to the top of the slide rail 32, and the two connecting plates 6 are connected to the side of the slide rail 32 facing the cutting teeth 1.

[0045] Furthermore, such as Figure 5 and Figure 6 As shown, the drive assembly 31 includes a drive member 311 and a bidirectional threaded rod 312. The bidirectional threaded rod 312 is rotatably mounted within the slide rail 32 along its length. Two clamping blocks 33 extend into the slide rail 32 at their ends facing the slide rail 32 and are screwed onto the bidirectional threaded rod 312. The fixed end of the drive member 311 is mounted on one side of the slide rail 32 along its length, and the drive end of the drive member 311 passes through the slide rail 32 and connects to one end of the bidirectional threaded rod 312. The drive end of the drive member 311 can drive the bidirectional threaded rod 312 to rotate, thereby causing the two clamping blocks 33 to move synchronously towards or away from each other along the axis of the bidirectional threaded rod 312. This enables synchronous and precise adjustment of the two clamping blocks 33, ensuring that the clamping mechanism 3 is stably and firmly clamped onto the gear seat 2. The rotation of the bidirectional threaded rod 312 allows for fine-tuning of the two clamping blocks 33, ensuring that the clamping mechanism 3 is firmly clamped onto the gear seat 2, thus improving the clamping accuracy and stability of the clamping mechanism 3.

[0046] Among them, the drive component 311 can be a small servo motor to adapt to the spacing between each cutting tooth 1 in the coal mining machine and avoid interference with other cutting teeth 1.

[0047] Furthermore, such as Figure 2 , Figure 5 and Figure 6 As shown, the tooth base 2 is a cylindrical structure, and the opposite side walls of the two clamping blocks 33 are arc-shaped structures 331 that are consistent with the outer contour of the tooth base 2. This enables the clamping blocks 33 to fit tightly with the tooth base 2, thereby increasing the contact area between the two clamping blocks 33 and the tooth base 2, improving the clamping stability and firmness of the clamping mechanism 3, and preventing the clamping mechanism 3 from loosening or slipping.

[0048] Furthermore, such as Figure 2 , Figure 5 and Figure 6 As shown, the tooth base 2 has a protrusion 21 in the middle. The arc-shaped structure 331 has a positioning groove 332 corresponding to the protrusion 21, which is used to position the clamping mechanism 3 on the tooth base 2. This allows for precise positioning of the clamping mechanism 3, ensuring that the axis of the circular groove 511 on the striking plate 51 is aligned with the axis of the cutting tooth 1, and that the side of the prying member 422 facing the annular interval a is aligned with the annular interval a. This allows the telescopic end of the second telescopic cylinder 421 to repeatedly insert the prying member 422 into the annular interval a to loosen the cutting tooth 1 and the tooth base 2, thus improving the accuracy of prying the cutting tooth 1 and striking the cutting tooth 1 to be installed.

[0049] Furthermore, such as Figure 1 As shown, the top of the slide rail 32 is equipped with a handle 7 to facilitate workers to quickly adjust the placement of the replacement device in the narrow and complex working environment downhole.

[0050] Based on the above structure, the working principle of the replacement device for replacing coal mining machine cutting teeth in this embodiment is as follows:

[0051] First, the operator aligns the clamping mechanism 3 with the tooth holder 2 of the cutting tooth 1 to be replaced using handle 7, with two clamping blocks 33 located on both sides of the tooth holder 2. The drive unit 311 is activated, causing the bidirectional threaded rod 312 to rotate, which in turn moves the two clamping blocks 33 synchronously towards each other along the slide rail 32, securing them stably to the tooth holder 2 via the arc-shaped structure 331 and the positioning groove 332. Then, the second telescopic cylinder 421 is activated, its telescopic end driving the prying member 422 to repeatedly extend into the annular gap a between the cutting tooth 1 and the tooth holder 2. Simultaneously, a high-frequency vibration is generated by the motor with a built-in vibration module, assisting the prying member 422 in widening the annular gap a. The trapezoidal cross-section of the prying member 422 further widens the annular gap a, thereby loosening the cutting tooth 1 from the tooth holder 2. When the cutting tooth 1 becomes loose from the tooth holder 2, the first telescopic cylinder 41 is activated. Its telescopic end extends and retracts, causing the second telescopic cylinder 421 and the prying member 422 to rotate synchronously around the hinge axis of the second telescopic cylinder 421 and the mounting plate 43 toward the tooth holder 2. Using the hinge point as the fulcrum, the prying tooth end of the prying member 422 pries the loosened cutting tooth 1 away from the tooth holder 2. Through continuous prying, the old cutting tooth 1 is gradually pried out of the tooth holder 2. Then, the workers remove the disassembled cutting tooth 1.

[0052] Then, the new cutting tooth 1 to be installed is inserted into the tooth holder 2, and at the same time, the two third telescopic cylinders 52 are activated. Their telescopic ends reciprocate at high speed, driving the striking plate 51 to quickly and evenly tap the end of the new cutting tooth 1 repeatedly, ensuring that the new cutting tooth 1 is installed in place and firmly fixed. This completes the replacement of the cutting tooth 1.

[0053] In the description of this invention, it should be understood that 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present 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.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A replacement device for replacing cutting teeth of a coal mining machine, wherein the cutting teeth (1) are coaxially inserted with the tooth holder (2) of the coal mining machine and an annular gap (a) is provided between them, characterized in that, The replacement device includes a clamping mechanism (3), a prying mechanism (4), and a striking mechanism (5); The clamping mechanism (3) clamps onto the toothed seat (2); The prying mechanism (4) includes a first telescopic cylinder (41) and a prying tooth assembly (42). The prying tooth assembly (42) is located on the side of the clamping mechanism (3) facing the cutting tooth (1). The prying tooth end of the prying tooth assembly (42) faces the annular gap (a) and can extend into the annular gap (a). The two ends of the first telescopic cylinder (41) are respectively hinged to the top of the clamping mechanism (3) and the top of the prying tooth assembly (42). The telescopic end of the first telescopic cylinder (41) can drive the prying tooth assembly (42) to rotate around its hinge axis with the clamping mechanism (3) toward the tooth seat (2), so that the prying tooth end of the prying tooth assembly (42) can pry the cutting tooth (1) away from the tooth seat (2). The striking mechanism (5) is mounted on the clamping mechanism (3), with its striking end facing the cutting tooth (1), and is used to strike the cutting tooth (1) to be installed until it is inserted into the tooth seat (2).

2. The replacement device for replacing coal mining machine cutting teeth as described in claim 1, characterized in that: The prying assembly (42) also includes a mounting plate (43), which is arranged laterally, with one end of the mounting plate (43) connected to the clamping mechanism (3) and the other end extending toward the prying tooth assembly (42); The prying tooth assembly (42) includes a second telescopic cylinder (421) and a prying member (422). The fixed end of the second telescopic cylinder (421) is hinged to the mounting plate (43) on the side facing the clamping mechanism (3). The telescopic end of the second telescopic cylinder (421) passes through the mounting plate (43) and is disposed towards the annular gap (a). The prying member (422) is detachably connected to the telescopic end of the second telescopic cylinder (421). The telescopic end of the second telescopic cylinder (421) can drive the prying member (422) to repeatedly extend into the annular gap (a). The prying member (422) is the prying tooth end of the prying tooth assembly (42). The telescopic end of the first telescopic cylinder (41) is hinged to the fixed end of the second telescopic cylinder (421) away from the mounting plate (43), so that the telescopic end of the second telescopic cylinder (421) can drive the second telescopic cylinder (421) and the prying member (422) to rotate synchronously around the hinge axis of the second telescopic cylinder (421) and the mounting plate (43).

3. The replacement device for replacing coal mining machine cutting teeth as described in claim 2, characterized in that: The prying member (422) is U-shaped, with its opening facing the annular gap (a), and the cross-section of the prying member (422) is trapezoidal, with the short side of the trapezoid facing the annular gap (a).

4. The replacement device for replacing coal mining machine cutting teeth as described in claim 3, characterized in that: The mounting plate (43) has an elongated hole (431) which is arranged along the axis of the cutting tooth (1), and the telescopic end of the second telescopic cylinder (421) passes through the elongated hole (431).

5. The replacement device for replacing coal mining machine cutting teeth as described in claim 1, characterized in that: The striking mechanism (5) includes a striking plate (51) and two third telescopic cylinders (52); The striking plate (51) is located on the side of the cutting tooth (1) away from the tooth seat (2) and is arranged along the axis perpendicular to the cutting tooth (1), and the striking plate (51) is the striking end; The two third telescopic cylinders (52) are located on both sides of the cutting tooth (1), and their axes are parallel to the axis of the cutting tooth (1). The fixed ends of the two third telescopic cylinders (52) are connected to the clamping mechanism (3) through the connecting plate (6), and the telescopic ends of the two third telescopic cylinders (52) are connected to the striking plate (51). The telescopic ends of the two third telescopic cylinders (52) can extend and retract synchronously, so as to drive the striking plate (51) to repeatedly strike the cutting tooth (1) to be installed inserted into the tooth seat (2).

6. The replacement device for replacing coal mining machine cutting teeth as described in claim 5, characterized in that: The striking plate (51) has a circular groove (511) on the side facing the cutting tooth (1), and the circular groove (511) is coaxial with the cutting tooth (1).

7. The replacement device for replacing coal mining machine cutting teeth as described in claim 5, characterized in that: The clamping mechanism (3) includes a drive assembly (31), a slide rail (32), and two clamping blocks (33). The slide rail (32) is located above the tooth seat (2), and the centerline of the slide rail (32) along its own length direction is perpendicular to the axis of the cutting tooth (1). The drive assembly (31) is mounted on the slide rail (32), and the drive assembly (31) is arranged along the length direction of the slide rail (32); The two clamping blocks (33) are spaced apart along the length of the slide rail (32) and located on both sides of the tooth seat (2). Both clamping blocks (33) extend into the slide rail (32) and are connected to the drive assembly (31) for transmission. The drive assembly (31) can drive the two clamping blocks (33) to move synchronously towards or away from each other along the length direction of the slide rail (32) so as to clamp the clamping mechanism (3) onto or off the toothed seat (2); The fixed end of the first telescopic cylinder (41) is hinged to the top of the slide rail (32), and the two connecting plates (6) are connected to the slide rail (32) on the side facing the cutting tooth (1).

8. The replacement device for replacing coal mining machine cutting teeth as described in claim 7, characterized in that: The drive assembly (31) includes a drive element (311) and a bidirectional threaded rod (312). The bidirectional threaded rod (312) is rotatably mounted in the slide rail (32) along the length direction of the slide rail (32), and the two clamping blocks (33) extend into the slide rail (32) at one end facing the slide rail (32) and are screwed to the bidirectional threaded rod (312); The fixed end of the driving member (311) is installed on one side of the slide rail (32) along its length, and the driving end of the driving member (311) passes through the slide rail (32) and is connected to one end of the bidirectional threaded rod (312). The driving end of the driving member (311) can drive the bidirectional threaded rod (312) to rotate, so as to drive the two clamping blocks (33) to move synchronously towards or away from each other along the axis of the bidirectional threaded rod (312).

9. The replacement device for replacing coal mining machine cutting teeth as described in claim 8, characterized in that: The tooth base (2) is a cylindrical structure, and the opposite side walls of the two clamping blocks (33) are arc-shaped structures (331) that are consistent with the outer contour of the tooth base (2).

10. The replacement device for replacing coal mining machine cutting teeth as described in claim 9, characterized in that: The toothed seat (2) has a protrusion (21) in the middle. The arc-shaped structure (331) has a positioning groove (332) corresponding to the protrusion (21) for positioning the clamping position of the clamping mechanism (3) on the tooth seat (2).

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