L-shaped cutting system of handheld rotary-cut type electric glue collecting machine

Abstract

The utility model discloses an L-shaped cutting system of a handheld rotary cutting type electric glue collecting machine, which comprises a machine body, a working head and a transmission assembly, the working head is provided with a blade assembly and a baffle supporting assembly, the transmission assembly is respectively connected with the machine body and the blade assembly, and the blade assembly comprises a lower cover, a positioning ring assembly and an L-shaped blade. The L-shaped blade, the positioning ring assembly and the lower cover are sequentially connected, the baffle supporting assembly is distributed around the L-shaped blade, and the lower cover is provided with a glue pulling hook. The machine body drives the blade assembly of the working head through the transmission assembly, and the electric glue collecting function is achieved. The baffle supporting assembly, the positioning ring assembly and the lower cover are matched, accurate positioning of cutting lines of the cutting face is achieved, rubber trees cannot be cut, residual rubber lines wound on the L-shaped blade can be scraped inwards, and broken barks falling in the cutting process can be blocked outwards. The rubber pulling hook can help to strip a rubber line left on a cutting line before rubber cutting.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber tapping machines, in particular to an L-shaped cutting system of a handheld rotary-cutting electric rubber tapping machine. Background Art

[0002] The rotary cutting electric rubber tapping machine is a garden-type electric rubber tapping tool developed based on the traditional manual rubber knife. It has a compact appearance and is easy to carry.

[0003] However, the actual rubber tapping process still faces certain problems. For example, the rubber cord can become entangled with the blades and related components, making it difficult to remove and affecting tapping efficiency. Second, bark fragments can fall onto the cutting line, causing latex to leak out, impacting rubber production and harming the workers' profits. Third, improper operation can damage the trees, shortening their lifespan. Fourth, the remaining rubber cord must be removed from the cutting line before tapping, but peeling it off with fingers is inefficient and painful. Therefore, it is necessary to design a working head structure that can automatically overcome the entanglement of the rubber cord during the tapping process, effectively separate the bark fragments, and prevent them from falling onto the cutting line. By using structural positioning and controlling the cutting angle, damage to the trees can be avoided, protecting the workers' economic interests. Summary of the Invention

[0004] The utility model aims to solve the defects of the prior art such as entanglement of rubber lines, falling of broken bark, cutting of rubber trees and residual rubber lines, and provides a new L-shaped cutting system for a handheld rotary-cutting electric rubber tapper.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions:

[0006] A handheld rotary-cutting electric rubber tapper L-shaped cutting system includes a body, a working head, and a transmission assembly. The working head is provided with a blade assembly and a baffle support assembly. The transmission assembly is connected to the body and the blade assembly respectively. The blade assembly includes a lower cover, a positioning ring assembly, and an L-shaped blade. The L-shaped blade, the positioning ring assembly, and the lower cover are connected in sequence. The baffle support assembly is distributed around the L-shaped blade. The lower cover is provided with a rubber extraction hook.

[0007] The machine body drives the blade assembly of the working head through a transmission assembly, achieving electric rubber tapping. The baffle support assembly, positioning ring assembly, and lower cover work together to precisely position the cutting line without damaging the tree. The blade also scrapes away residual rubber cord from the L-shaped blade and blocks bark debris from the cutting process. A rubber puller helps remove any remaining rubber cord from the cutting line before tapping.

[0008] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the working head is also provided with a gear box, the gear box cooperates with the transmission assembly, the gear box is connected to the lower cover, the baffle support assembly includes longitudinal side baffles, transverse side baffles, a front support, and a rear support, the longitudinal side baffles and the transverse side baffles are both connected to the front side of the lower cover, the front support is connected to the front side of the gear box, and the rear support is connected to the rear side of the lower cover.

[0009] The gearbox cooperates with the transmission assembly to achieve directional conversion of the transmission path, thereby enabling the machine to drive the blade assembly. When the rubber tapper begins cutting, the front support is placed on the cutting line. The machine body rotates a certain angle, using the front support as a fulcrum. When the rear support contacts the cutting line and the positioning ring assembly is in close contact with the cutting surface, it pushes along the cutting line and enters the cutting state. At this time, the front support is disengaged from the cutting line. As the rubber tapper approaches the cutting surface, along the cutting line, and pushes around, the positioning ring assembly remains in close contact with the cutting surface, and the rear support is in contact with the cutting line, preventing damage to the rubber tree. When the L-shaped blade cuts the rubber tree, some residual rubber thread will be entangled on the L-shaped blade. When the L-shaped blade passes at high speed within the positioning ring assembly, longitudinal side baffles, and transverse side baffles, it can scrape the rubber thread off the L-shaped blade. Any bark fragments that fall off during cutting are initially blocked by the longitudinal and transverse side baffles, and most of them quickly break away from the rubber thread. Some missed fragments are blocked a second time by the outer wall of the lower cover and separated again. By adjusting the distance between the front support, the rear support and the L-shaped blade, different requirements for the thickness of the cutting line can be met.

[0010] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the positioning ring assembly includes a positioning ring bearing, a rotating ring, and a positioning ring portion, the positioning ring bearing is connected inside the rotating ring and connected to the positioning ring portion, the L-shaped blade is also provided with a blade fixing seat, the L-shaped blade is connected to the lower side of the blade fixing seat, and the blade fixing seat is connected to the positioning ring portion.

[0011] The above design improves the structural stability and also ensures the functional stability of the positioning ring assembly and the L-shaped blade. The rotating ring is used to rotate when it is pushed against the cutting surface.

[0012] Preferably, the above-mentioned hand-held rotary cutting electric rubber tapping machine L-shaped cutting system, the transmission assembly includes a first bearing, a transmission shaft, a second bearing, a rear bevel gear, a third bearing, a front bevel gear, a fourth bearing, and an output shaft, the body is provided with a motor-gearbox assembly, the motor-gearbox assembly, the first bearing, the transmission shaft, the second bearing, the rear bevel gear, the gear box, the third bearing, the front bevel gear, the fourth bearing, the output shaft, and the blade fixing seat are arranged in sequence.

[0013] The above design improves the structural stability and also ensures the stable transmission function of the transmission component.

[0014] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the output shaft is connected to the blade fixing seat by a threaded connection, the longitudinal side baffle is connected to the lower cover by a screw, the front support is connected to the gear box by a screw, the rear support is connected to the lower cover by a screw, the positioning ring is connected to the lower cover by a screw, and the L-shaped blade is connected to the blade fixing seat by a screw.

[0015] The threaded connection and screw connection are simple and reliable, easy to assemble and disassemble, improve structural stability and facilitate maintenance.

[0016] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the transmission shaft has an interference fit with the rear bevel gear, the front bevel gear has an interference fit with the output shaft, the transmission shaft has a clearance fit with the motor gearbox assembly, and the gear box is connected to the lower cover by screws.

[0017] This design improves structural stability. The interference fit provides a stronger connection and a simple, reliable structure. The drive shaft and motor-gearbox assembly are connected via a notch, and the clearance fit reduces stress concentration and facilitates assembly and disassembly. The screw connection is simple, reliable, and easy to assemble and disassemble. The lower cover also features a small longitudinal platform. The gearbox and lower cover are connected, and the four recessed holes in the lower cover mate with the four screw posts on the gearbox.

[0018] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, lower cover positioning grooves are provided on both sides of the lower cover, the longitudinal side baffles are connected to the lower cover positioning grooves by screws, the rear support is connected to the lower cover positioning grooves by screws, the gear box is provided with a gear box positioning groove, and the front support is connected to the gear box positioning groove by screws.

[0019] The lower cover and gearbox positioning slots both serve as positioning mechanisms, enhancing installation accuracy and convenience. The screw connection is simple, reliable, and convenient for assembly and disassembly. Both the front and rear supports can be moved up and down to achieve slot positioning, and screws are used to secure after adjustment. The longitudinal side panels and lower cover positioning slots also provide slot positioning.

[0020] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the positioning ring portion is provided with a positioning ring center hole and a positioning ring countersunk hole, the lower cover is provided with a lower cover stop and a lower cover fixing column, the positioning ring center hole is connected to the lower cover stop, and the positioning ring countersunk hole is connected to the lower cover fixing column by screws.

[0021] This design achieves precise positioning of the stopper, ensuring coaxiality and robustness, and improving structural stability and positioning accuracy. The screw connection is simple, reliable, and easy to assemble and disassemble. One center hole in the locating ring is combined with three asymmetrical counterbores to achieve connection and assembly.

[0022] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the blade fixing seat is provided with a fixing seat positioning hole, a fixing seat threaded hole is provided in the fixing seat positioning hole, the output shaft is provided with an output shaft positioning column and an output shaft threaded column, the output shaft positioning column cooperates with the fixing seat positioning hole, and the output shaft threaded column is connected to the fixing seat threaded hole.

[0023] The above design realizes shaft positioning, ensures coaxiality and firmness, and improves structural stability and positioning accuracy.

[0024] Preferably, in the above-mentioned L-shaped cutting system of a hand-held rotary cutting electric rubber tapper, the blade fixing seat is provided with a fixing seat inclined surface and a fixing seat positioning groove surface, and the L-shaped blade is provided with a tail curved surface and an upper plane, the upper plane cooperates with the fixing seat positioning groove surface, and the tail curved surface cooperates with the fixing seat inclined surface.

[0025] The above design ensures the connection strength and accuracy between the L-shaped blade and the blade fixing seat, realizes the slot positioning, and improves the structural stability. The tail curved surface corresponds to the curved surface of the fixing seat inclined surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the utility model;

[0027] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0028] Figure 3 It is a right side structural schematic diagram of the present utility model;

[0029] Figure 4 This is a left-side structural schematic diagram of the present utility model;

[0030] Figure 5 for Figure 1 Schematic diagram of the cross-sectional structure in the AA direction;

[0031] Figure 6 This is a schematic diagram of the explosion structure of the utility model;

[0032] Figure 7 for Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0033] Figure 8This is a schematic diagram of the exploded structure of the positioning ring assembly in the present utility model;

[0034] Figure 9 This is a schematic structural diagram of the lower cover in the present utility model;

[0035] Figure 10 It is a schematic diagram of the exploded structure of the blade fixing seat and the L-shaped blade in the utility model. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-10 The present invention is further described in detail with reference to the following specific embodiments, but they are not intended to limit the present invention:

[0037] Example 1

[0038] A handheld rotary-cutting electric rubber tapping machine L-shaped cutting system includes a body 20, a working head 10, and a transmission assembly 2. The working head 10 is provided with a blade assembly 8 and a baffle support assembly 40. The transmission assembly 2 is connected to the body 20 and the blade assembly 8 respectively. The blade assembly 8 includes a lower cover 800, a positioning ring assembly 100, and an L-shaped blade 120. The L-shaped blade 120, the positioning ring assembly 100, and the lower cover 800 are connected in sequence. The baffle support assembly 40 is distributed around the L-shaped blade 120. The lower cover 800 is provided with a rubber pulling hook 6.

[0039] Preferably, the working head 10 is also provided with a gear box 3, the gear box 3 cooperates with the transmission assembly 2, the gear box 3 is connected to the lower cover 800, the baffle support assembly 40 includes a longitudinal side baffle 5, a transverse side baffle 7, a front support 4, and a rear support 9. The longitudinal side baffle 5 and the transverse side baffle 7 are both connected to the front side of the lower cover 800, the front support 4 is connected to the front side of the gear box 3, and the rear support 9 is connected to the rear side of the lower cover 800.

[0040] Preferably, the positioning ring assembly 100 includes a positioning ring bearing 101, a rotating ring 102, and a positioning ring portion 103. The positioning ring bearing 101 is connected to the rotating ring 102 and connected to the positioning ring portion 103. The L-shaped blade 120 is also provided with a blade fixing seat 110. The L-shaped blade 120 is connected to the lower side of the blade fixing seat 110, and the blade fixing seat 110 is connected to the positioning ring portion 103.

[0041] Preferably, the transmission assembly 2 includes a first bearing 21, a transmission shaft 22, a second bearing 23, a rear bevel gear 24, a third bearing 25, a front bevel gear 26, a fourth bearing 27, and an output shaft 28. The body 20 is provided with a motor-gearbox assembly 12, and the motor-gearbox assembly 12, the first bearing 21, the transmission shaft 22, the second bearing 23, the rear bevel gear 24, the gearbox 3, the third bearing 25, the front bevel gear 26, the fourth bearing 27, the output shaft 28, and the blade fixing seat 110 are arranged in sequence.

[0042] Preferably, the output shaft 28 is connected to the blade fixing seat 110 by threads, the longitudinal side baffle 5 is connected to the lower cover 800 by screws, the front support 4 is connected to the gear box 3 by screws, the rear support 9 is connected to the lower cover 800 by screws, the positioning ring portion 103 is connected to the lower cover 800 by screws, and the L-shaped blade 120 is connected to the blade fixing seat 110 by screws.

[0043] Preferably, the transmission shaft 22 is interference fit with the rear bevel gear 24, the front bevel gear 26 is interference fit with the output shaft 28, the transmission shaft 22 is clearance fit with the motor gearbox assembly 12, and the gear box 3 is connected to the lower cover 800 by screws.

[0044] Preferably, lower cover positioning grooves 80 are provided on both sides of the lower cover 800, the longitudinal side baffle 5 is connected to the lower cover positioning groove 80 by screws, the rear support 9 is connected to the lower cover positioning groove 80 by screws, the gear box 3 is provided with a gear box positioning groove 30, and the front support 4 is connected to the gear box positioning groove 30 by screws.

[0045] Preferably, the positioning ring portion 103 is provided with a positioning ring center hole 1031 and a positioning ring countersunk hole 1030, and the lower cover 800 is provided with a lower cover stop 84 and a lower cover fixing column 83, the positioning ring center hole 1031 is connected to the lower cover stop 84, and the positioning ring countersunk hole 1030 is connected to the lower cover fixing column 83 by screws.

[0046] Preferably, the blade fixing seat 110 is provided with a fixing seat positioning hole 111, and a fixing seat threaded hole 112 is provided in the fixing seat positioning hole 111. The output shaft 28 is provided with an output shaft positioning column 280 and an output shaft threaded column 281. The output shaft positioning column 280 cooperates with the fixing seat positioning hole 111, and the output shaft threaded column 281 is connected to the fixing seat threaded hole 112.

[0047] Preferably, the blade fixing seat 110 is provided with a fixing seat inclined surface 113 and a fixing seat positioning groove surface 114, and the L-shaped blade 120 is provided with a tail curved surface 121 and an upper plane 122, the upper plane 122 cooperates with the fixing seat positioning groove surface 114, and the tail curved surface 121 cooperates with the fixing seat inclined surface 113.

[0048] Before the rubber tapping operation begins, the remaining rubber strands on the cut line are removed using the rubber hook 6. The machine is then turned on and the L-shaped blade 120 is driven by the transmission assembly 2 to rotate at high speed to perform the rubber tapping operation. When the rubber tapping machine begins, the front support 4 is placed on the cut line. The machine body 20 rotates a certain angle, using the front support 4 as a fulcrum. When the rear support 9 contacts the cut line and the positioning ring assembly 100 abuts the cut surface, it pushes along the cut line and enters the cutting state. At this point, the front support 4 disengages from the cut line. As the machine leans against the cut surface, along the cut line, and around it, the positioning ring assembly 100 remains abutting the cut surface, and the rear support 9 contacts the cut line, preventing the rubber tree from being cut. While the L-shaped blade 120 is cutting the rubber tree, some residual rubber strands may become entangled with the blade 120. This can be scraped off by the blade 120 as it passes through the inner groove of the positioning ring assembly 100, the longitudinal side baffles 5, and the transverse side baffles 7 at high speed. The bark fragments that fall during the cutting process are initially blocked by the longitudinal and transverse side baffles 5 and 7, allowing most of them to quickly escape from the glue line. Any remaining fragments are then secondary blocked by the outer wall of the lower cover 800 and separated again. By adjusting the distance between the front and rear supports 4 and 9 and the L-shaped blade 120, different requirements for cutting line thickness can be met.

[0049] like Figure 1-6 As shown, the rubber tapping machine includes a body 20 and a working head 10. A motor-gearbox assembly 12 is assembled in the body 20. The motor-gearbox assembly 12 also includes a motor and a controller.

[0050] like Figure 5-7 As shown, the rear helical gear 24, second bearing 23, drive shaft 22, and first bearing 21 of the transmission assembly 2 are assembled in sequence. The fourth bearing 27, front helical gear 26, and third bearing 25 are assembled in sequence with the output shaft 28. The rear helical gear 24 and drive shaft 22 have an interference fit, while the second bearing 23 and drive shaft 22 have a transition fit. After assembly, the components are then assembled into the gearbox 3.

[0051] like Figure 6 and Figure 9 As shown, the lower cover center hole 81 and the lower cover positioning hole 82 of the lower cover 800 correspond to the gear box bearing hole wall 32 and the gear box stud 31 of the gear box 3 and are fastened with screws.

[0052] like Figure 6 and Figure 10As shown, the fixing seat positioning hole 111 and the fixing seat threaded hole 112 of the blade fixing seat 110 are respectively assembled with the output shaft 28, the output shaft positioning column 280, and the output shaft threaded column 281, and tightened into place, and the upper plane of the blade fixing seat 110 is flush with the boss surface of the output shaft 28.

[0053] like Figure 6-9 As shown, the positioning ring assembly 100 consists of a positioning ring bearing 101, a rotating ring 102, and a positioning ring portion 103. After assembly, the rotating ring 102 rotates flexibly. The positioning ring center hole 1031 and the positioning ring counterbore 1030 correspond to the lower cover stop 84 and the lower cover fixing column 83 of the lower cover 800, respectively, and are then tightened with screws.

[0054] like Figure 4 、 6 As shown in , 7 and 9, the front support 4 is installed in the gear box positioning groove 30 of the gear box 3, the longitudinal side baffle 5 is installed in the lower cover positioning groove 80 on one side of the lower cover 800, the rear support 9 is installed in the lower cover positioning groove 80 on the other side of the lower cover 800, the glue hook 6 is installed on the square plane of the lower cover 800, the plane 71 of the horizontal side baffle 7 is aligned with the side plane 85 of the lower cover 800, and they are fastened with screws one after another.

[0055] like Figure 6 、 7 As shown in FIG. 10 , the tail curved surface 121 and upper flat surface 122 of the L-shaped blade 120 are respectively assembled with the fixing seat inclined surface 113 and the fixing seat positioning groove surface 114 of the blade fixing seat 110 and fastened with a blade screw 130. After assembly, the L-shaped blade 120 is loosely matched with the flat surface 50 of the longitudinal side baffle 5, the flat surface 70 of the transverse side baffle 7, and the inner surface 1032 of the positioning ring portion 103. During the rubber tapping process, if the L-shaped blade 120 is entangled with rubber, it is scraped off.

[0056] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application for the present invention should fall within the scope of the present invention.

Claims

1. A handheld rotary cutting electric rubber tapping machine L-shaped cutting system, comprising a body (20), a working head (10), characterized in that: The invention also includes a transmission assembly (2), the working head (10) is provided with a blade assembly (8) and a baffle support assembly (40), the transmission assembly (2) is connected to the machine body (20) and the blade assembly (8) respectively, the blade assembly (8) includes a lower cover (800), a positioning ring assembly (100), and an L-shaped blade (120), the L-shaped blade (120), the positioning ring assembly (100), and the lower cover (800) are connected in sequence, the baffle support assembly (40) is distributed around the L-shaped blade (120), and the lower cover (800) is provided with a glue-pulling hook (6).

2. The L-shaped cutting system of a handheld electric rotary cutting rubber tapper according to claim 1, characterized in that: The working head (10) is also provided with a gear box (3), the gear box (3) cooperates with the transmission assembly (2), the gear box (3) is connected to the lower cover (800), the baffle support assembly (40) includes a longitudinal side baffle (5), a transverse side baffle (7), a front support (4), and a rear support (9), the longitudinal side baffle (5) and the transverse side baffle (7) are both connected to the front side of the lower cover (800), the front support (4) is connected to the front side of the gear box (3), and the rear support (9) is connected to the rear side of the lower cover (800).

3. The L-shaped cutting system of a handheld electric rotary cutting rubber tapper according to claim 2, characterized in that: The positioning ring assembly (100) comprises a positioning ring bearing (101), a rotating ring (102), and a positioning ring portion (103); the positioning ring bearing (101) is connected inside the rotating ring (102) and connected to the positioning ring portion (103); the L-shaped blade (120) is further provided with a blade fixing seat (110); the L-shaped blade (120) is connected to the lower side of the blade fixing seat (110); and the blade fixing seat (110) is connected to the positioning ring portion (103).

4. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 3, characterized in that: The transmission assembly (2) comprises a first bearing (21), a transmission shaft (22), a second bearing (23), a rear bevel gear (24), a third bearing (25), a front bevel gear (26), a fourth bearing (27), and an output shaft (28); the machine body (20) is provided with a motor-transmission gearbox assembly (12); the motor-transmission gearbox assembly (12), the first bearing (21), the transmission shaft (22), the second bearing (23), the rear bevel gear (24), the gear box (3), the third bearing (25), the front bevel gear (26), the fourth bearing (27), the output shaft (28), and the blade fixing seat (110) are arranged in sequence.

5. The L-shaped cutting system of a handheld electric rotary cutting rubber tapper according to claim 4, characterized in that: The output shaft (28) is connected to the blade fixing seat (110) by means of threads, the longitudinal side baffle (5) is connected to the lower cover (800) by means of screws, the front support (4) is connected to the gear box (3) by means of screws, the rear support (9) is connected to the lower cover (800) by means of screws, the positioning ring portion (103) is connected to the lower cover (800) by means of screws, and the L-shaped blade (120) is connected to the blade fixing seat (110) by means of screws.

6. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 4, characterized in that: The transmission shaft (22) is interference-fitted with the rear bevel gear (24), the front bevel gear (26) is interference-fitted with the output shaft (28), the transmission shaft (22) is clearance-fitted with the motor gearbox assembly (12), and the gearbox (3) is connected to the lower cover (800) by screws.

7. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 4, characterized in that: Lower cover positioning grooves (80) are provided on both sides of the lower cover (800), the longitudinal side baffles (5) are connected to the lower cover positioning grooves (80) by screws, the rear support (9) is connected to the lower cover positioning grooves (80) by screws, the gear box (3) is provided with a gear box positioning groove (30), and the front support (4) is connected to the gear box positioning groove (30) by screws.

8. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 4, characterized in that: The positioning ring portion (103) is provided with a positioning ring center hole (1031) and a positioning ring countersunk hole (1030); the lower cover (800) is provided with a lower cover stop (84) and a lower cover fixing column (83); the positioning ring center hole (1031) is connected to the lower cover stop (84); the positioning ring countersunk hole (1030) is connected to the lower cover fixing column (83) by screws.

9. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 4, characterized in that: The blade fixing seat (110) is provided with a fixing seat positioning hole (111), a fixing seat threaded hole (112) is provided in the fixing seat positioning hole (111), the output shaft (28) is provided with an output shaft positioning column (280) and an output shaft threaded column (281), the output shaft positioning column (280) cooperates with the fixing seat positioning hole (111), and the output shaft threaded column (281) is connected to the fixing seat threaded hole (112).

10. The L-shaped cutting system of a handheld electric rotary rubber tapper according to claim 4, characterized in that: The blade fixing seat (110) is provided with a fixing seat inclined surface (113) and a fixing seat positioning groove surface (114); the L-shaped blade (120) is provided with a tail curved surface (121) and an upper plane (122); the upper plane (122) cooperates with the fixing seat positioning groove surface (114); and the tail curved surface (121) cooperates with the fixing seat inclined surface (113).

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