Split type shield rapid opening and closing structure and grooving machine capable of rapidly replacing cutting blade

Abstract

The utility model relates to a split type shield quick opening and closing structure and a grooving machine with a cutting blade capable of being quickly replaced, and belongs to the technical field of grooving machines, the split type shield quick structure comprises an outer front shield, an inner shield and an outer rear shield, the outer front shield and the outer rear shield define a cavity with an opening in the bottom, the inner shield is partially located in the cavity, and the cutting blade can be quickly replaced in the cavity. A part is exposed out of the cavity; the front ends of the bottoms of the outer front cover, the inner cover and the outer rear cover are hinged through a rotating shaft; the inner cover is also connected with the outer front cover or the outer rear cover at the rotating shaft through a torsion spring; a locking mechanism is arranged at the top of the outer front cover, the locking mechanism is hinged to the outer front cover, and the locking mechanism buckles the outer rear cover in a locking state; and when the locking structure is in an open state, the outer front cover is rotationally connected relative to the outer rear cover by taking the rotating shaft as an axis. The split type shield rapid opening and closing structure is unlocked in two steps, the inner shield is separated from the position between the outer front shield and the outer rear shield firstly, then the outer front shield and the outer rear shield are separated, operation is easy, and the safety of the unlocking process can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of slotting machines, and in particular relates to a slotting machine with a split-type protective cover quick opening and closing structure and a quick-replaceable cutting blade. Background Art

[0002] The slotting machine is mainly used to cut strip grooves on surfaces such as walls, floors or wood. The main structure includes a slotting machine body, a cutting blade arranged at the front of the slotting machine body, a left handle arranged at the tail end of the slotting machine body, a right handle arranged on the upper side of the slotting machine body, and a motor installed in the slotting machine body. The motor drives the cutting blade to rotate through a transmission device, and the start and stop of the motor are controlled by a switch. The structure of the slotting machine is simple and easy to operate, but there is a problem that the cutting blade will generate a lot of dust when cutting and slotting at high speed. The flying dust will not only affect the efficiency and accuracy of cutting and slotting, but also cause serious pollution to the surrounding environment and harm the health of the staff.

[0003] At present, the measures taken to take this shortcoming into consideration are generally to specify the cutting direction of the cutting blade, or to set a small water spray device during cutting, or to set a protective cover around the cutting blade, wherein setting a protective cover is the simplest and most widely used method. The Chinese patent with the authorization announcement number CN213797437U discloses a dust collecting shield for the slotting blade of a road slotting machine, including the above-mentioned dust collecting shield for the slotting blade of a road slotting machine, the dust collecting shield for the slotting blade of the road slotting machine is fixed on the body of the road slotting machine, and also includes a negative pressure device and a filter device, the air inlet of the filter device is connected to the end of the dust suction adapter tube through a PVC steel wire tube, and the air outlet of the filter device is connected to the air suction port of the negative pressure device through a pipeline.

[0004] However, after the slotting machine has been used for a period of time, the cutting disc needs to be replaced. After adding a protective cover, it is very difficult to replace the disc, and the protective cover needs to be removed with screws, which reduces work efficiency and user experience. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a split-type protective cover quick opening and closing structure and a slotting machine capable of quickly replacing cutting blades, so as to solve the problems of difficult blade replacement and complicated operation of the existing slotting machine with a protective cover.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] The utility model relates to a split-type protective cover quick opening and closing structure, which comprises an outer front cover, an inner cover and an outer rear cover, wherein the outer front cover and the outer rear cover enclose a cavity with an open bottom, wherein the inner cover is partially located in the cavity and partially exposed from the cavity; the bottom front ends of the outer front cover, the inner cover and the outer rear cover are hinged by a rotating shaft, and the inner cover is also connected to the outer front cover or the outer rear cover at the rotating shaft through a torsion spring; a locking mechanism is provided on the top of the outer front cover, which is hinged to the outer front cover, and the locking mechanism buckles the outer rear cover in a locked state; when the locking structure is in an open state, the outer front cover is rotatably connected relative to the outer rear cover with the rotating shaft as the axis.

[0008] Preferably, the locking structure includes a quick-change buckle, a rotating shaft is provided on the side of the outer front cover close to the outer rear cover, the quick-change buckle is sleeved on the rotating shaft, a protrusion is provided at the bottom of the quick-change buckle, and a recess is provided on the outer rear cover. In the locked state, the protrusion is inserted into the recess, and then the outer front cover and the outer rear cover are clamped by the quick-change buckle; when releasing the locked state, it is only necessary to pull the quick-change buckle to pull the protrusion out of the recess.

[0009] Preferably, the locking structure further comprises a spring, which is sleeved on the rotating shaft and located between the quick-change buckle and the outer front cover; a latch is also provided on the side of the quick-change buckle close to the outer rear cover, and a latch hole is provided on the side of the outer rear cover close to the outer front cover. In the locked state, the latch is inserted into the latch hole. When the locked state is released, after the quick-change buckle is pulled, the elastic force of the spring still pushes the quick-change buckle toward the side of the outer rear cover, and the latch is inserted into the latch hole. The outer front cover and the outer rear cover are connected at two points at the rotating shaft and the latch, and the outer front cover and the outer rear cover still cannot rotate relative to each other. The quick-change buckle is further pushed toward the side of the outer front cover, so that the latch moves out of the latch hole. The outer front cover and the outer rear cover are only connected at the rotating shaft. At this time, the outer front cover and the outer rear cover can rotate relative to each other.

[0010] Preferably, a limit screw is screwed on the end of the rotating shaft to prevent the quick-change buckle from falling off the rotating shaft, which can ensure that the rotating shaft will not fall off the outer front cover when the outer front cover and the outer rear cover are misaligned.

[0011] Preferably, the quick-change buckle is provided with a circular through hole for the rotating shaft to pass through, and an annular protrusion is provided in the circular through hole. The diameter of the nut part of the limit screw is larger than the diameter of the rotating shaft, and the end face of the annular protrusion contacts the nut.

[0012] Preferably, an inner cover boss is provided on one side of the inner cover close to the outer front cover, and an arc guide groove is provided on one side of the outer front cover close to the inner cover, the arc guide groove is not connected to the lower edge of the outer front cover, and the boss is located in the arc guide groove.

[0013] The utility model also relates to a slotting machine with quickly replaceable cutting blades, which comprises a main machine, an outer front cover, an inner cover, an outer rear cover and two cutting blades; the outer front cover and the outer rear cover enclose a cavity with an open bottom, the inner cover is partially located in the cavity and partially exposed from the cavity; the bottom front ends of the outer front cover, the inner cover and the outer rear cover are hinged by a rotating shaft, and the inner cover is also connected to the outer front cover or the outer rear cover at the rotating shaft through a torsion spring; a locking mechanism is provided on the top of the outer front cover, the locking mechanism is hinged to the outer front cover, and the locking mechanism buckles the outer rear cover in a locked state; when the locking structure is in an open state, the outer front cover is rotatably connected relative to the outer rear cover with the rotating shaft as the axis; the outer rear cover is fixed to the main machine, and the output shaft of the main machine passes through the outer rear cover and extends to the inside of the inner cover; the cutting blades are arranged at intervals inside the inner cover, and are all connected to the output shaft of the main machine.

[0014] Preferably, a plurality of gaskets are provided between the two cutting blades, and the cutting blades and the gaskets are pressed and connected to form a whole through a front pressing plate and a rear pressing plate.

[0015] Preferably, the locking structure includes a spring and a quick-change buckle, a rotating shaft is provided on the side of the outer front cover close to the outer rear cover, the spring and the quick-change buckle are both mounted on the rotating shaft, and the spring is located between the quick-change buckle and the outer front cover, and a limit screw is screwed on the end of the rotating shaft to prevent the quick-change buckle from falling off the rotating shaft; a protrusion is provided at the bottom of the quick-change buckle, and a recess is provided on the outer rear cover, and in the locked state, the protrusion is inserted into the recess; a latch is provided on the side of the quick-change buckle close to the outer rear cover, and a latch hole is provided on the side of the outer rear cover close to the outer front cover, and in the locked state, the latch is inserted into the latch hole.

[0016] Preferably, an inner cover boss is provided on one side of the inner cover close to the outer front cover, and an arc guide groove is provided on one side of the outer front cover close to the inner cover, the arc guide groove is not connected to the lower edge of the outer front cover, and the boss is located in the arc guide groove.

[0017] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0018] 1. The utility model relates to a split-type quick-opening and closing structure of a protective cover, which comprises an outer front cover, an inner cover and an outer rear cover. The bottom front ends of the three are hinged by a rotating shaft. A locking mechanism is provided at the top of the outer front cover, which is hinged to the outer front cover. The locking mechanism buckles the outer rear cover in a locked state. When the cutting blade of the slotting machine needs to be replaced, the locking mechanism is unlocked, and the outer front cover, the inner cover and the outer rear cover can rotate relatively with the rotating shaft as the axis. After the outer front cover, the inner cover and the outer rear cover are misaligned, the cutting blade of the slotting machine can be exposed, and the cutting blade can be replaced, which is easy to operate.

[0019] 2. The locking structure involved in the utility model includes a spring and a quick-change pull buckle. A rotating shaft is provided on the side of the outer front cover close to the outer rear cover. The spring and the quick-change pull buckle are both sleeved on the rotating shaft, and the spring is located between the quick-change pull buckle and the outer front cover. A convex block is provided at the bottom of the quick-change pull buckle, and a concave portion is provided on the outer rear cover. In the locked state, the convex block is inserted into the concave portion; a latch is provided on the side of the quick-change pull buckle close to the outer rear cover, and a latch hole is provided on the side of the outer rear cover close to the outer front cover. In the locked state, the latch is inserted into the latch hole; an inner cover boss is provided on the side of the inner cover close to the outer front cover, and an arc-shaped guide groove is provided on the side of the outer front cover close to the inner cover. The arc-shaped guide groove is not connected to the lower edge of the outer front cover, and the boss is located in the arc-shaped guide groove. The quick-change pull buckle is unlocked in two steps. In the first step of unlocking, the inner cover is separated from between the outer front cover and the outer rear cover, and in the second step of unlocking, the outer front cover and the outer rear cover are separated. This is not only simple to operate, but also ensures the safety of the unlocking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of the split-type shield quick opening and closing structure involved in the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the split-type shield quick opening and closing structure of the utility model in a locked state;

[0022] Figure 3 It is a schematic diagram of the split-type shield quick opening and closing structure involved in the utility model after the locking state is released;

[0023] Figure 4 It is a detailed view of the connection node where the quick-change lever locks the outer front cover and the outer rear cover;

[0024] Figure 5 It is a schematic diagram of the insertion of the pin of the quick-change trigger into the pin hole of the outer rear cover;

[0025] Figure 6 This is a schematic diagram of the quick-change lever pin being pulled out of the outer rear cover pin hole;

[0026] Figure 7 It is an exploded view of the slotting machine involved in the utility model;

[0027] Figure 8 This is a front view of the slotting machine involved in the utility model;

[0028] Fig. 9 is a schematic diagram of the structure after the inner cover is taken out from the cavity between the outer front cover and the outer rear cover;

[0029] Fig.10 It is a schematic diagram of rotating the outer front cover or the outer rear cover so that the outer front cover and the outer rear cover are misaligned.

[0030] Description of the drawings: 1-rotating shaft, 2-outer front cover, 3-inner cover, 4-torsion spring, 5-outer rear cover, 6-spring, 7-quick-change buckle, 8-limit screw, 9-front pressure plate, 10-gasket, 11-rear pressure plate, 12-cutting disc, 13-main machine, 14-rotating shaft, 15-latch, 16-latch hole, 17-bump, 18-recess, 19-circular through hole, 20-inner cover boss, 21-arc guide groove, 22-annular protrusion. DETAILED DESCRIPTION

[0031] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with embodiments. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0032] Example 1

[0033] See attached Figure 1 and attached Figure 2 As shown, this embodiment relates to a split-type shield quick opening and closing structure, which includes an outer front cover 2, an inner cover 3 and an outer rear cover 5. The outer front cover 2 and the outer rear cover 5 enclose a cavity with an open bottom, the inner cover 3 is partially located in the cavity and partially exposed from the cavity, the bottom front ends of the outer front cover 2, the inner cover 3 and the outer rear cover 5 are hinged by a rotating shaft 1, and the inner cover 3 is also connected to the outer front cover 2 or the outer rear cover 5 at the rotating shaft 1 through a torsion spring 4. The inner cover 3 is provided with an inner cover boss 20 on the side close to the outer front cover 2, and an arc guide groove 21 is provided on the side close to the inner cover 3 of the outer front cover 2. The arc guide groove 21 is not connected to the lower edge of the outer front cover 2, and the boss is located in the arc guide groove 21.

[0034] The top of the outer front cover 2 is provided with a locking mechanism, which is hinged to the outer front cover 2, and the specific structure is as follows:

[0035] The outer front cover 2 is provided with a rotating shaft 14 on one side close to the outer rear cover 5. The locking structure includes a quick-change buckle 7 and a spring 6. The quick-change buckle 7 is provided with a circular through hole 19 for the rotating shaft 14 to pass through. The length of the circular through hole 19 is less than the length of the rotating shaft 14. An annular protrusion 22 is provided in the circular through hole 19. Figure 5 As shown; the quick-change button 7 and the spring 6 are both sleeved on the rotating shaft 14, and the spring 6 is located between the quick-change button 7 and the outer front cover 2. The end of the rotating shaft 14 is screwed with a limit screw 8 for preventing the quick-change button 7 from falling off the rotating shaft 14. The diameter of the nut part of the limit screw 8 is larger than the diameter of the rotating shaft 14, so that the end face of the annular protrusion 22 contacts the nut, as shown in FIG. Figure 5 and Figure 6 shown.

[0036] The bottom of the quick-change lever 7 is provided with a protrusion 17, and the outer rear cover 5 is provided with a recess 18. Figure 1 and Figure 4As shown, in the locked state, the protrusion 17 is inserted into the recess 18, and then the outer front cover 2 and the outer rear cover 5 are clamped by the quick-change buckle 7; when the locked state is released, it is only necessary to pull the quick-change buckle 7 to pull the protrusion 17 out of the recess 18.

[0037] The quick-change lever 7 is also provided with a latch 15 on one side close to the outer rear cover 5, and a latch hole 16 is provided on one side close to the outer front cover 2. Figure 1 , 5 , 6; in the locked state, the latch 15 is inserted into the latch hole 16. When the locked state is released, after the quick-change button 7 is pulled, the elastic force of the spring 6 still pushes the quick-change button 7 to the side of the outer rear cover 5, and the latch 15 is inserted into the latch hole 16. The outer front cover 2 and the outer rear cover 5 are connected at two points at the rotating shaft 1 and the latch 15. The outer front cover 2 and the outer rear cover 5 still cannot rotate relative to each other. The quick-change button 7 is further pushed toward the side of the outer front cover 2, so that the latch 15 is moved out of the latch hole 16. The outer front cover 2 and the outer rear cover 5 are only connected at the rotating shaft 1. At this time, the outer front cover 2 and the outer rear cover 5 can rotate relative to each other.

[0038] The locking mechanism buckles the outer rear cover 5 in the locked state, so that the outer front cover 2 and the outer rear cover 5 are connected at the top; when the locking structure is in the unlocked state, the outer front cover 2 is rotatably connected relative to the outer rear cover 5 with the rotating shaft 1 as the axis.

[0039] Example 2

[0040] See attached Figure 7 As shown, this embodiment relates to a slotting machine with a rapidly replaceable cutting blade, which comprises a main machine 13, an outer front cover 2, an inner cover 3, an outer rear cover 5 and two cutting blades 12. The outer front cover 2 and the outer rear cover 5 enclose a cavity with an open bottom, the inner cover 3 is partially located in the cavity and partially exposed from the cavity, the bottom front ends of the outer front cover 2, the inner cover 3 and the outer rear cover 5 are hinged by a rotating shaft 1, and the inner cover 3 is also connected to the outer front cover 2 or the outer rear cover 5 at the rotating shaft 1 through a torsion spring 4. The inner cover 3 is provided with an inner cover boss 20 on the side close to the outer front cover 2, and an arc guide groove 21 is provided on the side close to the inner cover 3 of the outer front cover 2, the arc guide groove 21 is not connected to the lower edge of the outer front cover 2, and the boss is located in the arc guide groove 21.

[0041] The top of the outer front cover 2 is provided with a locking mechanism, which is hinged to the outer front cover 2, and the specific structure is as follows:

[0042] The outer front cover 2 is provided with a rotating shaft 14 on one side close to the outer rear cover 5. The locking structure includes a quick-change buckle 7 and a spring 6. The quick-change buckle 7 is provided with a circular through hole 19 for the rotating shaft 14 to pass through. The length of the circular through hole 19 is less than the length of the rotating shaft 14. An annular protrusion 22 is provided in the circular through hole 19. Figure 5As shown; the quick-change button 7 and the spring 6 are both sleeved on the rotating shaft 14, and the spring 6 is located between the quick-change button 7 and the outer front cover 2. The end of the rotating shaft 14 is screwed with a limit screw 8 for preventing the quick-change button 7 from falling off the rotating shaft 14. The diameter of the nut part of the limit screw 8 is larger than the diameter of the rotating shaft 14, so that the end face of the annular protrusion 22 contacts the nut, as shown in FIG. Figure 5 and Figure 6 shown.

[0043] The bottom of the quick-change lever 7 is provided with a protrusion 17, and the outer rear cover 5 is provided with a recess 18. Figure 7 and Figure 4 As shown, in the locked state, the protrusion 17 is inserted into the recess 18, and then the outer front cover 2 and the outer rear cover 5 are clamped by the quick-change buckle 7; when the locked state is released, it is only necessary to pull the quick-change buckle 7 to pull the protrusion 17 out of the recess 18.

[0044] The quick-change lever 7 is also provided with a latch 15 on one side close to the outer rear cover 5, and a latch hole 16 is provided on one side close to the outer front cover 2. Figure 7 , 5 , 6; in the locked state, the latch 15 is inserted into the latch hole 16. When the locked state is released, after the quick-change button 7 is pulled, the elastic force of the spring 6 still pushes the quick-change button 7 to the side of the outer rear cover 5, and the latch 15 is inserted into the latch hole 16. The outer front cover 2 and the outer rear cover 5 are connected at two points at the rotating shaft 1 and the latch 15. The outer front cover 2 and the outer rear cover 5 still cannot rotate relative to each other. The quick-change button 7 is further pushed toward the side of the outer front cover 2, so that the latch 15 is moved out of the latch hole 16. The outer front cover 2 and the outer rear cover 5 are only connected at the rotating shaft 1. At this time, the outer front cover 2 and the outer rear cover 5 can rotate relative to each other.

[0045] The locking mechanism buckles the outer rear cover 5 in the locked state, so that the outer front cover 2 and the outer rear cover 5 are connected at the top; when the locking structure is in the unlocked state, the outer front cover 2 is rotatably connected relative to the outer rear cover 5 with the rotating shaft 1 as the axis.

[0046] See attached Figure 7 and 8As shown, the outer rear cover 5 is fixed on the main machine 13, and the output shaft of the main machine 13 passes through the outer rear cover 5 and extends to the inside of the inner cover 3; the cutting blades 12 are arranged at intervals inside the inner cover 3, and are all connected to the output shaft of the main machine 13, specifically: a plurality of gaskets 10 are arranged between the two cutting blades 12, and the cutting blades 12 and the gaskets 10 are pressed and connected to form a whole through the front pressing plate 9 and the rear pressing plate 11, and the whole structure is installed on the output shaft of the main machine 13. When in use, the main machine 13, the outer front cover 2 and the outer rear cover 5 are relatively fixed, and the bottom surface of the inner cover 3 and the bottom surface of the outer front cover 2 form a certain angle, and the bottom surface of the inner cover 3 is attached to the cutting object, and the combined structure of the main machine 13, the outer front cover 2 and the outer rear cover 5 is pressed down, and the inner cover 3 and the combined structure of the main machine 13, the outer front cover 2 and the outer rear cover 5 are relatively rotated to expose the cutting blades 12, and the cutting object is grooved.

[0047] When the above-mentioned slotting machine with quickly replaceable cutting blades is in a locked state, the quick-change button 7 fastens the outer front cover 2 and the outer rear cover 5. At this time, the inner cover boss 20 can only move in the arc-shaped guide groove 21, and the inner cover 3 cannot be moved out of the cavity formed by the outer front cover 2 and the outer rear cover 5; after the quick-change button 7 is pulled, the protrusion 17 is pulled out of the recess 18, the outer front cover 2 and the outer rear cover 5 are relatively loose, and the gap between them becomes larger, the inner cover boss 20 can leave the arc-shaped guide groove 21, and the inner cover 3 can be moved out of the cavity formed by the outer front cover 2 and the outer rear cover 5. Fig. 9 As shown, the spring 6 still pushes the quick-change buckle 7 toward the side of the outer rear cover 5, and the latch 15 is inserted into the latch hole 16, as shown in FIG. Figure 5 As shown, the outer front cover 2 and the outer rear cover 5 are connected at two points at the rotating shaft 1 and the latch 15, and the outer front cover 2 and the outer rear cover 5 still cannot rotate relative to each other; Figure 3 Push the quick-change lever 7 in the direction of the arrow, so that the spring 6 is compressed and the latch 15 is moved out of the latch hole 16. Figure 6 As shown, the outer front cover 2 and the outer rear cover 5 are connected only at the rotating shaft 1, so that the outer front cover 2 and the outer rear cover 5 can rotate relative to each other and achieve misalignment, such as Fig.10 As shown, the outer front cover 2, the inner cover 3 and the outer rear cover 5 are staggered. At this time, the cutting blade 12 is exposed, and the cutting blade 12 can be removed from the output shaft of the main machine 13 and replaced with a new cutting blade 12. After the cutting blade 12 is replaced, the outer front cover 2 and the outer rear cover 5 are assembled first, until the position of the latch 15 corresponds to the latch hole 16, and the spring 6 pushes the quick-change lever 7 until the latch 15 is inserted into the latch hole 16; then the inner cover 3 is rotated to make the inner cover 3 return to the cavity formed by the outer front cover 2 and the outer rear cover 5; finally, the quick-change lever 7 is pulled to make the protrusion 17 inserted into the recess 18, and the outer front cover 2 and the outer rear cover 5 are connected and fixed and the inner cover 3 is clamped.

[0048] The above is a detailed description of the utility model in combination with the embodiments, but the contents described are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A split shield quick opening and closing structure, characterized in that: It includes an outer front cover, an inner cover and an outer rear cover, wherein the outer front cover and the outer rear cover enclose a cavity with an open bottom, wherein the inner cover is partially located in the cavity and partially exposed from the cavity; the bottom front ends of the outer front cover, the inner cover and the outer rear cover are hinged by a rotating shaft, and the inner cover is also connected to the outer front cover or the outer rear cover at the rotating shaft through a torsion spring; a locking mechanism is provided on the top of the outer front cover, which is hinged to the outer front cover, and the locking mechanism buckles the outer rear cover in the locked state; when the locking mechanism is in the open state, the outer front cover is rotatably connected relative to the outer rear cover with the rotating shaft as the axis.

2. The split shield quick opening and closing structure according to claim 1 is characterized in that: The locking mechanism includes a quick-change buckle, a rotating shaft is provided on the side of the outer front cover close to the outer rear cover, the quick-change buckle is sleeved on the rotating shaft, a protrusion is provided at the bottom of the quick-change buckle, and a recess is provided on the outer rear cover. In the locked state, the protrusion is inserted into the recess.

3. The split shield quick opening and closing structure according to claim 2 is characterized in that: The locking mechanism also includes a spring, which is sleeved on the rotating shaft and located between the quick-change buckle and the outer front cover; the quick-change buckle is also provided with a latch on the side close to the outer rear cover, and the outer rear cover is provided with a latch hole on the side close to the outer front cover. In the locked state, the latch is inserted into the latch hole.

4. The split shield quick opening and closing structure according to claim 2 is characterized in that: The end of the rotating shaft is screwed with a limit screw for preventing the quick-change buckle from falling off the rotating shaft.

5. The split shield quick opening and closing structure according to claim 4 is characterized in that: The quick-change buckle has a circular through hole for the rotating shaft to pass through, and an annular protrusion is provided in the circular through hole. The diameter of the nut part of the limit screw is larger than the diameter of the rotating shaft, and the end face of the annular protrusion contacts the nut.

6. The split shield quick opening and closing structure according to claim 1 is characterized in that: The inner cover is provided with an inner cover boss on one side close to the outer front cover, and the outer front cover is provided with an arc guide groove on one side close to the inner cover. The arc guide groove is not connected with the lower edge of the outer front cover, and the boss is located in the arc guide groove.

7. A slotting machine capable of quickly replacing cutting blades, characterized in that: It includes a main unit, an outer front cover, an inner cover, an outer rear cover and two cutting blades; the outer front cover and the outer rear cover form a cavity with an open bottom, the inner cover is partially located in the cavity and partially exposed from the cavity; the bottom front ends of the outer front cover, the inner cover and the outer rear cover are hinged by a rotating shaft, and the inner cover is also connected to the outer front cover or the outer rear cover at the rotating shaft through a torsion spring; a locking mechanism is provided on the top of the outer front cover, the locking mechanism is hinged to the outer front cover, and the locking mechanism buckles the outer rear cover in the locked state; when the locking mechanism is in the open state, the outer front cover is rotatably connected relative to the outer rear cover with the rotating shaft as the axis; the outer rear cover is fixed to the main unit, and the output shaft of the main unit passes through the outer rear cover and extends to the inside of the inner cover; the cutting blades are arranged inside the inner cover at intervals and are all connected to the output shaft of the main unit.

8. The slotting machine with a rapidly replaceable cutting blade according to claim 7, characterized in that: A plurality of gaskets are arranged between the two cutting blades, and the cutting blades and the gaskets are pressed and connected to form a whole through the front pressing plate and the rear pressing plate.

9. The slotting machine with a rapidly replaceable cutting blade according to claim 7, characterized in that: The locking mechanism includes a spring and a quick-change buckle. A rotating shaft is provided on the side of the outer front cover close to the outer rear cover. The spring and the quick-change buckle are both mounted on the rotating shaft, and the spring is located between the quick-change buckle and the outer front cover. A limit screw is screwed on the end of the rotating shaft to prevent the quick-change buckle from falling off the rotating shaft. A protrusion is provided at the bottom of the quick-change buckle, and a recess is provided on the outer rear cover. In the locked state, the protrusion is inserted into the recess. A latch is provided on the side of the quick-change buckle close to the outer rear cover, and a latch hole is provided on the side of the outer rear cover close to the outer front cover. In the locked state, the latch is inserted into the latch hole.

10. The slotting machine with a fast-changeable cutting blade according to claim 7, characterized in that: The inner cover is provided with an inner cover boss on one side close to the outer front cover, and the outer front cover is provided with an arc guide groove on one side close to the inner cover. The arc guide groove is not connected with the lower edge of the outer front cover, and the boss is located in the arc guide groove.

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