Cutting arm

Abstract

The utility model discloses a cutting arm which comprises an arm body and a cutting head, the cutting head is fixedly connected with one end of the arm body, the cutting head comprises a plurality of cutting tooth seats and a plurality of cutting tooth heads, the cutting tooth seats and the cutting tooth heads are connected in a one-to-one correspondence mode, dovetail grooves are formed in the tops of the cutting tooth seats, dovetail blocks are arranged at the bottoms of the cutting tooth heads, and the dovetail blocks are embedded in the dovetail grooves. The outer part of the cutting tooth seat is sleeved with a limiting barrel, the inner wall of the limiting barrel is propped against the outer wall of the cutting tooth seat, the limiting barrel is rotationally connected with the cutting tooth seat, the limiting barrel covers or exposes the dovetail groove through rotation, the limiting barrel is provided with a fixing structure, and the limiting barrel is fixed with the dovetail block through the fixing structure. According to the technical scheme, the single-point replacement of the cutting pick head is realized by adopting the quick insertion and extraction of the dovetail groove-block, and the cutting head or the cutting base body does not need to be disassembled, so that the replacement time is shortened; and a mechanical covering mechanism of the rotary limiting cylinder is combined with a fixing structure, so that double anti-falling guarantee is provided while welding is cancelled.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting arm technical field, especially cutting arm. BACKGROUND

[0002] The existing tunneling machine cutting arm is the core component of the roadway tunneling equipment, and is usually composed of a cutting head, a transmission mechanism and a cantilever structure. The cutting head surface is arranged with a plurality of cutting teeth, which is driven by a motor or a hydraulic drive to rotate at high speed, and the rock or coal seam is broken by the impact and cutting action of the cutting teeth. Such equipment generally adopts an integral cutting head design, and the cutting teeth are fixed on the surface of the cutting head base body by welding and rely on the rigid support of the transmission system to transmit power. Although this structure has high reliability under normal working conditions, its cutting tooth fixing method and maintenance efficiency have obvious defects.

[0003] In actual application, the cutting teeth of the traditional cutting arm are fixedly connected with the cutting head base body by welding, and when a single cutting tooth needs to be replaced due to wear, the entire cutting head or partial structure needs to be disassembled after shutdown, which takes a long time of several hours, seriously affecting the construction progress; at the same time, the high temperature of welding easily leads to embrittlement of the cutting tooth base body material, reduces its impact resistance, and repeated welding will damage the surface structure of the cutting head, aggravating the stability problem of subsequent cutting tooth installation. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a cutting arm, which can quickly replace the cutting tooth head when the cutting head is worn, and reduce the downtime.

[0005] To achieve the above purpose, the utility model provides a cutting arm, which comprises an arm body and a cutting head, the cutting head is fixedly connected with one end of the arm body, the cutting head comprises a plurality of cutting tooth seats and a plurality of cutting tooth heads, the plurality of cutting tooth seats and cutting tooth heads are connected one by one, the top of the cutting tooth seat is provided with a dovetail groove, the bottom of the cutting tooth head is provided with a dovetail block, the dovetail block is embedded in the dovetail groove, a limiting cylinder is arranged outside the cutting tooth seat, the inner wall of the limiting cylinder abuts against the outer wall of the cutting tooth seat, the limiting cylinder is rotationally connected with the cutting tooth seat, the limiting cylinder covers or exposes the dovetail groove through rotation, the limiting cylinder is provided with a fixing structure, and the limiting cylinder is fixed with the dovetail block through the fixing structure.

[0006] In a possible implementation, the side wall of the limiting cylinder is provided with an insertion port, the insertion port is aligned or separated with the dovetail groove through rotation of the limiting cylinder, and the insertion port is used for conveniently inserting the dovetail block into the dovetail groove.

[0007] In a possible implementation, the fixing structure comprises an axial bolt and a lateral bolt, the axial bolt is embedded in the cutting tooth seat and the cutting tooth head, and the lateral bolt is embedded in the limiting cylinder and the cutting tooth head.

[0008] In a possible implementation, the axial bolt and the lateral bolt are flange face bolts, and the axial bolt and the lateral bolt are both provided with a sawtooth anti-loosening washer.

[0009] In a possible implementation, the arm body is provided with a cooling pipeline, the cooling pipeline extends to the cutting head, and the end of the cooling pipeline is provided with a spray head, and the spray head faces the cutting head.

[0010] In a possible implementation, a lubricating gasket is arranged between the dovetail groove and the dovetail block, and the lubricating gasket is used to reduce the friction between the dovetail groove and the dovetail block.

[0011] The working principle and beneficial effects of the utility model are as follows:

[0012] The utility model discloses technical scheme adopt dovetail groove-block quick plug-in to realize single-point replacement of pick head, do not need to disassemble cutting head or cutting base body, and the replacement time is shortened from several hours to several minutes;Through the mechanical covering mechanism of rotary limit cylinder and fixed structure, double anti-falling protection is provided while cancelling welding, and the damage of high temperature welding to material performance is avoided;In addition, the modular pick design allows only replacing damaged components, reduces overall maintenance cost, and significantly improves construction efficiency and economy. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in the drawings without creating labor.

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a front side view of the utility model;

[0016] Figure 3 It is a structural schematic view of pick seat and pick head in the utility model;

[0017] Figure 4 It is Figure 3 The explosion diagram.

[0018] Explanation of reference numerals: 1, arm body;2, cutting head;3, pick seat;4, pick head;5, limit cylinder;6, axial bolt;7, lateral bolt;8, lubricating gasket;11, cooling pipeline;12, spray head;31, dovetail groove;41, dovetail block;51, insertion port;67, sawtooth anti-loosening washer.

[0019] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical schemes and advantages of the application more clear and explicit, the application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and not used to limit the application.

[0021] As Figures 1-4 shown, the embodiment proposes a cutting arm, which comprises an arm body 1 and a cutting head 2, the cutting head 2 is fixedly connected with one end of the arm body 1, the cutting head 2 comprises a plurality of cutting tooth seats 3 and a plurality of cutting tooth heads 4, the plurality of cutting tooth seats 3 and the cutting tooth heads 4 are connected one by one, the top of the cutting tooth seat 3 is provided with a dovetail groove 31, the bottom of the cutting tooth head 4 is provided with a dovetail block 41, the dovetail block 41 is embedded in the dovetail groove 31, a limiting cylinder 5 is arranged outside the cutting tooth seat 3, the inner wall of the limiting cylinder 5 abuts against the outer wall of the cutting tooth seat 3, the limiting cylinder 5 is rotationally connected with the cutting tooth seat 3, the limiting cylinder 5 covers or exposes the dovetail groove 31 through rotation, the limiting cylinder 5 is provided with a fixing structure, and the limiting cylinder 5 is fixed with the dovetail block 41 through the fixing structure.

[0022] The arm body 1 serves as the main support structure of the cutting arm, connecting the cutting head 2 and other related components, providing support and power transmission path for the cutting head 2. The cutting head 2 is used to directly participate in the cutting work, and the material is broken and cut through the cooperation of the cutting tooth seat 3 and the cutting tooth head 4. The cutting tooth seat 3 is used to fix the cutting tooth head 4, providing the installation position for the cutting tooth head 4, and transmitting the force received by the cutting tooth head 4 to the main body of the cutting head 2. At the same time, cooperating with the limiting cylinder 5, the fixation and protection of the cutting tooth head 4 are realized. The setting of the cutting tooth seat 3 ensures the stability of the cutting tooth head 4 during the working process, so that the cutting tooth head 4 can accurately act on the material, improving the precision and effect of cutting. The cutting tooth head 4 is the component that directly contacts and cuts the material, and its sharp shape and high-strength material can effectively break and cut the material. In this embodiment, the cutting performance of the cutting arm can be restored in time after the cutting tooth head 4 is worn out by replacing the cutting tooth head 4, reducing the maintenance cost and improving the work efficiency. The dovetail groove 31 is arranged at the top of the cutting tooth seat 3, and the dovetail block 41 is arranged at the bottom of the cutting tooth head 4, which cooperates with each other to realize the quick installation and positioning of the cutting tooth head 4 and the cutting tooth seat 3. The dovetail structure has good guiding property and stability, which can ensure that the cutting tooth head 4 is accurately installed on the cutting tooth seat 3, and is not easy to deviate or shake during the working process, improving the precision and reliability of cutting. At the same time, this connection mode is convenient for dismounting and replacing the cutting tooth head 4, improving the maintenance efficiency. The limiting cylinder 5 can cover or expose the dovetail groove 31 by rotating, so as to realize the control of the installation and dismounting of the cutting tooth head 4. In addition, it can also protect the cutting tooth seat 3 and the cutting tooth head 4, preventing foreign matters from entering the connecting part and affecting its performance. The setting of the limiting cylinder 5 protects the connecting part of the cutting tooth seat 3 and the cutting tooth head 4, prolonging the service life. At the same time, the exposure and covering of the dovetail groove 31 are controlled by rotating the limiting cylinder 5, which facilitates the installation and dismounting operation of the cutting tooth head 4. The fixing structure fixes the limiting cylinder 5 and the dovetail block 41, ensuring that the cutting tooth head 4 will not fall off from the cutting tooth seat 3 due to external force during the cutting process, ensuring the stability and reliability of the cutting head 2. The setting of the fixing structure enhances the firmness of the connection between the cutting tooth head 4 and the cutting tooth seat 3, improves the safety and stability of the cutting arm during the working process, and reduces the equipment failure and safety accidents caused by the loosening or falling off of the cutting tooth head 4.

[0023] In this embodiment, the limiting cylinder 5 side wall is provided with an insertion port 51, and the insertion port 51 is aligned or separated with the dovetail groove 31 by rotating the limiting cylinder 5. The insertion port 51 provides a convenient channel for the dovetail block 41 to insert into the dovetail groove 31. By rotating the limiting cylinder 5, the insertion port 51 is aligned with the dovetail groove 31, which facilitates the smooth insertion of the dovetail block 41 at the bottom of the cutting tooth head 4 into the dovetail groove 31, and completes the preliminary connection of the cutting tooth head 4 and the cutting tooth seat 3. The setting of the insertion port 51 greatly improves the installation convenience of the cutting tooth head 4, reduces the operation difficulty and time cost in the installation process.

[0024] In this embodiment, the fixing structure includes an axial bolt 6 and a lateral bolt 7. The axial bolt 6 is embedded in the cutting tooth seat 3 and the cutting tooth head 4, and the lateral bolt 7 is embedded in the limiting cylinder 5 and the cutting tooth head 4. The axial bolt 6 and the lateral bolt 7 are flange bolts, and both the axial bolt 6 and the lateral bolt 7 are provided with serrated anti-loosening washers 67.

[0025] Axial bolts 6 are embedded in the cutting tooth holder 3 and the cutting tooth head 4, fastening them together along the axial direction of the cutting tooth head 4. This ensures that the cutting tooth head 4 will not shift axially during cutting, bearing the axial component of the cutting force and guaranteeing the stability of the connection between the cutting tooth head 4 and the cutting tooth holder 3. Using flange bolts increases the contact area between the bolt head and the connected parts, resulting in a more uniform distribution of tightening force, reducing local stress concentration, and improving connection reliability. Simultaneously, the flange design helps prevent bolt rotation during tightening, facilitating construction operations. Lateral bolts 7 are embedded in the limiting cylinder 5 and the cutting tooth head 4, fixing the cutting tooth head 4 laterally and preventing lateral swaying or displacement during operation. Working in conjunction with the axial bolts 6, they ensure reliable fixation of the cutting tooth head 4 in all directions, further enhancing the stability of the cutting tooth head 4 installation. Also using flange bolts, they possess the same advantages as the axial bolts 6: uniform distribution of tightening force, prevention of bolt rotation, and ensuring the stability and reliability of the connection. The serrated anti-loosening washer 67 is installed on the axial bolt 6 and the lateral bolt 7. Through its serrated structure, after the bolt is tightened, it engages with the bolt head and the surface of the connected parts, generating friction and resistance to prevent the bolt from loosening under external forces such as vibration and impact. The serrated anti-loosening washer 67 effectively improves the anti-loosening performance of the bolt connection and enhances the reliability of the entire fixing structure. During the operation of the cutting arm, vibration and impact are inevitable. If the bolts loosen, the cutting tooth head 4 may loosen or even fall off, affecting the normal operation of the cutting work and even causing safety accidents. The use of the serrated anti-loosening washer 67 greatly reduces this risk, improves the safety and stability of the equipment, reduces the maintenance and repair work required due to bolt loosening, and lowers maintenance costs.

[0026] In this embodiment, the arm body 1 is provided with a cooling pipe 11, which extends to the cutting head 2. A spray head 12 is located at the end of the cooling pipe 11, facing the cutting head 2. The cooling pipe 11 provides a flow channel for the cooling medium to the cutting head 2. The circulating cooling medium carries away the large amount of heat generated by the cutting head 2 during operation, preventing damage or performance degradation due to overheating. Simultaneously, it helps maintain the temperature stability of the arm body 1, preventing excessive temperature from affecting the structural strength of the arm body 1 and the normal operation of other components. The spray head 12 sprays the cooling medium from the cooling pipe 11 in the form of a spray, directly acting on the cutting head 2. On one hand, the spray further enhances the cooling effect on the cutting head 2, rapidly reducing its temperature through vaporization and heat absorption; on the other hand, the spray forms a layer of water mist around the cutting head 2, reducing dust generation during cutting, improving the working environment, and protecting the health of operators. This dual effect improves both equipment performance and the quality of the working environment. The enhanced cooling effect helps maintain the stable performance of the cutting head 2, improving its cutting efficiency and accuracy. At the same time, the dust suppression effect reduces dust pollution in the workplace, lowers safety risks such as dust explosions, meets environmental and safety requirements, and provides operators with a safer and healthier working environment.

[0027] In this embodiment, a lubricating pad 8 is provided between the dovetail groove 31 and the dovetail block 41 to reduce friction between them. The lubricating pad 8 reduces friction between the two components during relative movement. By forming an isolation layer between them, the frictional resistance generated by direct contact between the metal surfaces is reduced. The lubricating pad 8 effectively reduces the wear on the surfaces of the dovetail groove 31 and the dovetail block 41, extending the service life of these two components. Due to reduced friction, the wear rate of the metal surface slows down, reducing dimensional changes and loss of precision caused by wear, thereby ensuring the stability and reliability of the cutting head 2 structure. Simultaneously, reducing friction reduces the heat generated by friction, preventing damage to the dovetail groove 31, the dovetail block 41, and surrounding structures due to overheating, thus protecting the structural integrity of the entire cutting head 2.

[0028] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cutting arm, comprising an arm body (1) and a cutting head (2), wherein the cutting head (2) is fixedly connected to one end of the arm body (1), characterized in that, The cutting head (2) includes several cutting tooth seats (3) and several cutting tooth heads (4). The several cutting tooth seats (3) and cutting tooth heads (4) are connected one-to-one. The top of the cutting tooth seat (3) is provided with a dovetail groove (31). The bottom of the cutting tooth head (4) is provided with a dovetail block (41). The dovetail block (41) is embedded in the dovetail groove (31). The cutting tooth seat (3) is fitted with a limiting cylinder (5). The inner wall of the limiting cylinder (5) abuts against the outer wall of the cutting tooth seat (3). The limiting cylinder (5) is rotatably connected to the cutting tooth seat (3). The limiting cylinder (5) covers or exposes the dovetail groove (31) by rotation. The limiting cylinder (5) is provided with a fixing structure. The limiting cylinder (5) is fixed to the dovetail block (41) by the fixing structure.

2. A cutting arm according to claim 1, characterized in that, The side wall of the limiting cylinder (5) is provided with an insertion port (51). The insertion port (51) is aligned with or separated from the dovetail groove (31) by rotating the limiting cylinder (5). The insertion port (51) is used to facilitate the insertion of the dovetail block (41) into the dovetail groove (31).

3. A cutting arm according to claim 1, characterized in that, The fixing structure includes an axial bolt (6) and a lateral bolt (7). The axial bolt (6) is embedded in the cutting tooth seat (3) and the cutting tooth head (4), and the lateral bolt (7) is embedded in the limiting cylinder (5) and the cutting tooth head (4).

4. A cutting arm according to claim 3, characterized in that, The axial bolt (6) and the lateral bolt (7) are flange bolts, and both the axial bolt (6) and the lateral bolt (7) are provided with serrated anti-loosening washers (67).

5. A cutting arm according to claim 1, characterized in that, The arm body (1) is provided with a cooling pipe (11) that extends to the cutting head (2) and a spray head (12) is provided at the end of the cooling pipe (11) that faces the cutting head (2).

6. A cutting arm according to claim 1, characterized in that, A lubricating pad (8) is provided between the dovetail groove (31) and the dovetail block (41), and the lubricating pad (8) is used to reduce the friction between the dovetail groove (31) and the dovetail block (41).

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