CN114769722A - Compound saw - Google Patents

Abstract

The invention relates to a compound saw, wherein a base is provided with a beveling station for beveling, the top of a rack is provided with a table cutting station for table cutting, the rear end of the rack can be rotatably connected to the base so that the front end of the rack can swing up and down relative to the base, the compound saw can be switched between a beveling mode and a table cutting mode, the upper and lower edges of the saw blade can be respectively and correspondingly exposed out of the top and the bottom of the rack through the relative positioning of the saw blade and the rack, the saw blade and the rack can not relatively move in the switching process of the cutting mode of the compound saw, thereby avoiding complex driving, locking or unlocking, and simultaneously only controlling an upper shield and a lower shield to enable one of the upper side and the lower side of the saw blade to be in a covering state and the other to be in an exposing state so as to select the beveling station or the table cutting station, and completing the conversion of the cutting mode of the compound saw.

Description

Compound saw

Technical Field

The invention relates to the field of cutting tools, in particular to a compound saw.

Background

Compound saws are widely used because they are capable of performing both table cutting and mitering operations. The compound saw uses part of saw blade higher than the table top plate to perform table cutting work, and uses part of saw blade under the table top plate to perform oblique cutting work. The existing compound saw has different structures and different methods for converting the working modes, some of the compound saws change the relative position of the table top plate and the saw blade by adjusting the high and low positions of the table top plate, some of the compound saws change the relative position of the table top plate and the saw blade by adjusting the high and low positions of the saw blade, and the aim of converting the working modes is fulfilled by matching with the actions of converting an electric control switch, locking or unlocking a shield and the like.

For example, chinese utility model patent No. CN201520733769.4 discloses a compound saw in which a saw blade is raised to an upper position of a table top plate to switch the compound saw to a table cutting operation mode, and lowered to a lower position of the table top plate to switch the compound saw to a miter cutting operation mode. Simultaneously such saw bit goes up and down and can also cooperate down protection casing and bench cutting protection casing, drives the lower protection casing upwards swing through motor drive assembly under the bench cutting mode to the below of protection saw bit, and under oblique cutting mode, utilize the bench cutting protection casing of top to protect the saw bit top.

Obviously, under the condition of the prior art, although the structural design protects the non-working area of the saw blade while considering the use state conversion, the conversion process of the working mode of the compound saw is relatively complex, particularly, the saw blade and the frame move relatively in the conversion process, so that the saw blade and the power system thereof need to be driven, locked and unlocked separately when in use, so that the whole compound saw has too many parts, high requirements on manufacturing precision and complex structure.

Disclosure of Invention

The invention provides a compound saw which can realize conversion mode cutting without relative movement of a saw blade and a frame, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a compound saw which can automatically realize corresponding locking or unlocking of the upper and lower guard shields when converting to a table cutting or beveling mode, aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a compound saw, comprising:

the base is provided with a beveling station for beveling;

the top of the machine frame is provided with a bench cutting station for bench cutting, and the rear end of the machine frame can be rotatably connected to the base so that the front end of the machine frame can swing up and down relative to the base, so that the compound saw can be switched between a beveling mode and a bench cutting mode;

the saw blade is rotatably arranged in the rack;

the saw blade and the rack are oppositely positioned, the upper edge and the lower edge of the saw blade are respectively exposed out of the top and the bottom of the rack, and the bottom and the top of the rack are respectively provided with a first notch and a second notch for the saw blade to extend out along the front-back direction; and

the protection assembly comprises an upper shield and a lower shield, the upper shield is arranged at the top of the rack and can cover the upper edge of the saw blade, the lower shield is arranged at the bottom of the rack and can cover the lower edge of the saw blade, the upper shield and the lower shield can be both reversely constrained on the rack, so that one of the upper edge and the lower edge of the saw blade is in a covering state, the other one of the upper edge and the lower edge of the saw blade is in an exposed state, and a beveling station or a bench cutting station is selected for use.

In order to ensure that the compound saw can complete the cutting action under two using modes, preferably, the frame comprises a body and a table board arranged on the top of the body, the first notch is arranged at the bottom of the body, the second notch is arranged on the table board, and in the state that the frame swings upwards to the beveling mode, a first cutting edge for beveling is formed on the lower edge of the saw blade extending from the first notch to the lower part of the body; and under the state that the machine frame swings downwards to the table cutting, a second cutting edge for table cutting is formed on the upper edge of the saw blade extending out of the second notch to the upper part of the table panel.

Preferably, the rear end of the upper shield is rotatably connected to the table panel and the rotation point thereof is located at the rear side of the second cut-out, so that the front side thereof can swing up and down relative to the table panel to expose or cover the second cutting edge on the upper side of the saw blade, respectively.

In order to ensure that the first cutting edge on the lower side of the saw blade can be protected in the table cutting mode and automatically exposed in the beveling mode, preferably, the inside of the machine frame is hollow to form a mounting cavity, the lower protective cover comprises a first cover body and a second cover body, the first cover body and the second cover body are both arranged on the periphery of the saw blade, and the upper ends of the first cover body and the second cover body are rotatably connected in the mounting cavity, so that the respective lower ends can move downwards to be close to each other to form a complete lower protective cover by being jointed on the lower side of the machine frame, or move upwards to be away from each other under the pushing action of a workpiece to respectively retract into the mounting cavity, so that the first cutting edge on the lower side of the saw blade is exposed in the first notch.

In order to further solve the second technical problem, the invention adopts the following technical scheme: still be provided with link assembly, first elastic component and second elastic component in the frame, link assembly is including the first connecting rod that is used for locking the upper shield and the second connecting rod that is used for locking lower shield, first elastic component is used in on the first connecting rod to make first connecting rod have the trend of locking upper shield all the time under the state of last shield upset downwards to covering second cutting edge, the second elastic component is used in on the second connecting rod to make the second connecting rod have the trend of unblock lower shield all the time, thereby make the first cover body and the second cover body of lower shield can the rebound and contract in the frame. The matching form of the connecting rod assembly and the two elastic pieces can automatically lock the upper shield in a beveling mode, and simultaneously unlock the lower shield, so that the novel bevel gear is very convenient.

In order to ensure a simple conversion process, and to protect the cutting edge corresponding to the saw blade in the mode conversion by one-step operation, preferably, the base is further provided with a driving member, the lower end of the driving member is constrained on the base so that the upper end of the driving member swings up and down relative to the base, and the driving member can simultaneously abut against a first connecting rod and a second connecting rod in the connecting rod assembly in an upward swinging state so that the first connecting rod is in a state of unlocking the upper shield and the second connecting rod is in a state of locking the lower shield, thereby limiting the first cover body and the second cover body of the lower shield from contracting into the mounting cavity to cover the lower edge of the saw blade.

Specifically, the first connecting rod and the second connecting rod are located on the lateral side of the saw blade, an opening for the first connecting rod and the second connecting rod to extend out is formed in the front end wall of the rack, and the upper end of the driving piece swings to the opening to abut against the first connecting rod and the second connecting rod simultaneously when the compound saw is in a bench cutting mode.

In order to ensure that the connecting rod can lock or unlock the upper shield, preferably, the first connecting rod includes a horizontal section and a vertical section, wherein the front end of the horizontal section is located at the opening of the front end wall of the rack, the vertical section is arranged at the rear end of the horizontal section to form an L-shaped structure, a first rotating shaft is penetrated in the middle of the horizontal section, the first connecting rod is rotatably installed in the installation cavity through the first rotating shaft, and in the cutting mode, the top of the driving piece can abut against the bottom of the front end of the horizontal section, so that the rear end of the horizontal section drives the vertical section to swing downwards to be separated from the swing path of the front side of the upper shield.

In order to avoid the separation of the driving part and the connecting rod assembly after the action, preferably, the free end of the driving part is provided with a lock catch, a lock seat is arranged at the front end of the rack correspondingly, a lock rod and a third elastic part are arranged in the lock seat, the lock rod is positioned at the front side of the lock catch and is at least partially limited in the lock catch in a state that the driving part is abutted against the first connecting rod and the second connecting rod simultaneously, and the third elastic part acts on the lock rod so that the lock rod always has a tendency of being locked in the lock catch.

In order to ensure that the second connecting rod can act on the two covers of the lower shield at the same time to prevent the two covers from moving upwards, preferably, the second connecting rod is transversely arranged and provided with two convex columns which are arranged at intervals, in a cutting mode, the driving piece swings upwards until the side part abuts against the front end of the second connecting rod, so that the second connecting rod moves transversely, and the two convex columns are respectively positioned on the upward moving paths of the first cover and the second cover, so that the first cover and the second cover are in a downward moving joint state, and a complete lower shield state is formed.

Compared with the prior art, the invention has the advantages that: in the compound saw, the saw blade and the rack are relatively positioned, so that the edge parts capable of being cut on the upper side and the lower side of the saw blade are respectively and correspondingly exposed out of the top and the bottom of the rack, in the conversion process of the cutting mode of the compound saw, the saw blade and the rack do not move relatively any more, a complex linkage structure is avoided, and meanwhile, only the upper shield and the lower shield need to be controlled, so that one of the upper side and the lower side of the saw blade is in a covering state, and the other one of the upper side and the lower side of the saw blade is in an exposing state, so that a beveling station or a bench cutting station can be selected for use, and the conversion of the cutting mode of the compound saw is completed.

Drawings

FIG. 1 is a schematic view of the overall structure of a compound saw according to a first embodiment of the present invention (table cutting mode);

FIG. 2 is a schematic view showing the overall structure of the compound saw according to the first embodiment of the present invention (bevel mode);

FIG. 3 is a schematic view of the driving member and the connecting rod assembly in accordance with the first embodiment of the present invention (with a portion of the frame omitted);

FIG. 4 is a schematic view of the linkage assembly in cooperation with the frame;

FIG. 5 is a schematic view of the locking of the second link to the first and second enclosures of the lower shield;

FIG. 6 is an overall view of the second link;

FIG. 7 is an overall schematic view of the gantry;

FIG. 8 is a general view of a first embodiment of a lock base according to the present invention;

fig. 9 is an overall view of a second structure of the lock base according to the second embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Example 1:

as shown in fig. 1 to 8, a preferred embodiment of the present invention. In this embodiment, the compound saw includes a base 1, a frame 2, and a guard assembly. Wherein, a beveling station 1a for beveling is arranged on the base 1, a cutting station 2a for cutting is arranged at the top of the frame 2, the rear end of the frame 2 can be rotatably connected on the base 1, so that the front end of the frame can swing up and down relative to the base 1, thereby the compound saw can be switched between a beveling mode and a cutting mode, and a saw blade 3 can be rotatably arranged in the frame 2.

The saw blade 3 and the frame 2 in this embodiment are relatively positioned, specifically, the saw blade 3 is installed on the frame 2 through a central shaft, and the saw blade 3 can rotate relative to the frame 2 under the driving of a motor (not shown). The upper and lower edges of the saw blade 3 are respectively exposed out of the top and bottom of the frame 2, and the bottom and top of the frame 2 are respectively provided with a first notch 201 and a second notch 202 along the front-back direction for the saw blade 3 to extend out. Specifically, the frame 2 includes a body 21 and a table 22 disposed on the top of the body 21, a first notch 201 is opened on the bottom of the body 21, a second notch 202 is opened on the table 22, and a first cutting edge for beveling is formed on the lower side (i.e., the lower edge) of the saw blade 3 extending from the first notch 201 to the lower side of the body 21 in the state that the frame 2 swings upward to the beveling mode; in the state where the frame 2 is swung down to the table-cut, the upper side portion (i.e., the upper edge) of the saw blade 3 protruding from the second cutout 202 above the table top plate 22 forms a second cutting edge for the table-cut. The protection assembly comprises an upper shield 41 which is arranged at the top of the frame 2 and can cover the upper edge of the saw blade 3 and a lower shield 42 which is arranged at the bottom of the frame 2 and can cover the lower edge of the saw blade 3, wherein both the upper shield 41 and the lower shield 42 can be reversely restrained on the frame 2, so that one of the upper edge and the lower edge of the saw blade 3 is in a covering state, and the other one is in an exposed state, and the bevel cutting station 1a or the table cutting station 2a can be used alternatively.

In order to ensure the protection effect, the rear end of the upper shield 41 in this embodiment is rotatably connected to the table top 22 and the rotation point thereof is located at the rear side of the second notch 202, so that the front side thereof can swing up and down relative to the table top 22 (specifically, on the material separating plate connected to the table top 22) to expose or cover the second cutting edge on the upper side of the saw blade 3, respectively. The inside of the frame 2 is hollow to form the mounting cavity 20, the lower shield 42 specifically includes a first shield body 421 and a second shield body 422, both the first shield body 421 and the second shield body 422 are disposed at the periphery of the saw blade 3, and the upper ends of the first shield body 421 and the second shield body 422 are rotatably connected in the mounting cavity 20, so that the respective lower ends can move downward and approach each other to form the complete lower shield 42 by joining at the lower side of the frame 2, or move upward and separate from each other under the pushing action of the workpiece to respectively retract into the mounting cavity 20, so that the lower edge of the saw blade 3, i.e., the first cutting edge at the lower side is exposed to the first cut 201. The first cover 421 is connected to the frame 2 rotatably through a second rotating shaft 423 penetrating through the upper end of the first cover and disposed at the rear end inside the frame 2, and when the upper end of the second cover 422 is coaxial with the saw blade 3 for practical use, if no external force is involved, the first cover 421 and the second cover 422 can be jointed to form a complete lower shield 42 at the lower side of the frame 2 all the time under the action of gravity, and when a workpiece enters the beveling station 1a, the workpiece pushes against the first cover 421 and the second cover 422, so that one or both of the first cover 421 and the second cover 422 move up and retract to the mounting cavity 20, and the saw blade 3 is exposed for cutting.

When the cutting mode is switched, the actions of exposing one of the upper cutting edge or the lower cutting edge of the saw blade 3 and synchronously covering the other cutting edge are realized by the connecting rod assembly 5. Namely, a link assembly 5, a first elastic member (not shown) and a second elastic member (not shown) are further provided in the housing 2, the link assembly 5 includes a first link 51 for locking the upper shield 41 and a second link 52 for locking the lower shield 42, the first elastic member 5a acts on the first link 51 so that the first link 51 always has a tendency to lock the upper shield 41 in a state where the upper shield 41 is turned down to cover the second cutting edge, and the second elastic member acts on the second link 52 so that the second link 52 always has a tendency to unlock the lower shield 42, thereby enabling the first cover 421 and the second cover 422 of the lower shield 42 to move upward to be retracted into the housing 2.

In order to ensure that the two connecting rods can be driven to be linked by one operation, a driving piece 6 is further arranged on the base 1, the lower end of the driving piece 6 is constrained on the base 1 so that the upper end of the driving piece 6 can swing up and down relative to the base 1, and the driving piece 6 can simultaneously abut against a first connecting rod 51 and a second connecting rod 52 in a connecting rod assembly 5 in an upward swinging state so that the first connecting rod 51 overcomes the elastic force of a first elastic piece to enable the upper shield 41 to be in an unlocked state, and the second connecting rod 52 is in a state of locking the lower shield 42, so that the first cover 421 and the second cover 422 of the lower shield 42 are limited to be contracted towards the inside of the mounting cavity 20 to cover the lower edge of the saw blade 3. I.e., the second link 52 therein, functions to lock and unlock the lower shield 42, the unlocking action of which is triggered by the second elastic member. The second connecting rod 52 maintains an unlocking state in a natural state, so that the first cover 421 and the second cover 422 of the lower shield 42 can freely contract without restriction, and the state corresponds to the beveling mode of the whole compound saw, namely the saw blade 3 is switched to the first cutting edge of the lower edge to perform cutting action; the locking action of the second connecting rod 52 is triggered by the driving member 6, the driving member 6 drives the second connecting rod 52 to move to the rotation path of the first cover 421 and the second cover 422 after overcoming the elastic force of the second elastic member, so that the rotation of the first connecting rod and the second cover 422 is limited and the second connecting rod cannot be contracted into the mounting cavity 20, the state corresponds to the table cutting mode of the whole compound saw, namely, the saw blade 3 is converted to the second cutting edge at the upper edge to perform cutting action, and the first cutting edge at the lower edge of the saw blade 3 is jointed by the first cover 421 and the second cover 422 of the lower shield 42 and is wrapped in the lower shield 42, thereby avoiding the danger caused by exposure, and ensuring that foreign matters cannot enter the mounting cavity 20 to influence the operation of the saw blade 3.

In the embodiment, the first connecting rod 51 and the second connecting rod 52 are both located at the side of the saw blade 3, the frame 2 is provided with an opening 23 on the front end wall for the first connecting rod 51 and the second connecting rod 52 to extend out, and when the compound saw is in the table cutting mode, the upper end of the driving member 6 swings to the opening 23, so as to simultaneously abut against the first connecting rod 51 and the second connecting rod 52. Specifically, the first connecting rod 51 includes a horizontal section 511 and a vertical section 512, wherein the front end of the horizontal section 511 is located at the opening 23 of the front side end wall of the rack 2, the vertical section 512 is arranged at the rear end of the horizontal section 511 to form an L-shaped structure, a first rotating shaft 513 is penetrated in the middle of the horizontal section 511, the first connecting rod 51 is rotatably installed in the installation cavity 20 through the first rotating shaft 513, and in the table-cutting mode, the top of the driving element 6 can abut against the bottom of the front end of the horizontal section 511, so that the rear end of the horizontal section 511 drives the vertical section 512 to swing downwards to be separated from the swing path of the front side of the upper shield 41. The second link 52 is transversely arranged, and two protruding columns 521 which are arranged at intervals are arranged on the second link 52, in the table cutting mode, the driving element 6 swings upwards to the side part to abut against the front end of the second link 52, so that the second link 52 moves transversely (i.e. the driving element 6 swings to the vertical state at first, and the frame 2 swings downwards integrally in the conversion process from beveling to table cutting, so that the first link 51 and the second link 52 actively contact the driving element 6 in the swing process of the random frame 2, and then the corresponding driving action is completed), and the two protruding columns 521 are respectively located on the upward moving path of the first cover 421 and the second cover 422, so that the first cover 421 and the second cover 422 are in the downward moving joint state, and a complete lower shield 42 is formed. In addition, after the compound saw switches the working mode, the saw blade 3 performs the cutting action by using the corresponding cutting edge, so an electronic control switch is arranged in the mounting cavity 20 of the frame 2, the electronic control switch in this embodiment is arranged on the moving path of the second connecting rod 52, meanwhile, a trigger rod 522 is arranged on the second connecting rod, and the trigger rod 522 on the second connecting rod can simultaneously control the electronic control switch to perform circuit switching while the second connecting rod 52 moves to lock and unlock the lower shield 42, so that electromechanical synchronous switching is achieved.

Besides, the driving element 6 in this embodiment can trigger the driving of the connecting rod, and can also realize the locking and unlocking with the frame 2 by itself, wherein the free end of the driving element 6 has a lock catch 61, a lock seat 24 is provided at the front end of the frame 2, a lock rod 241 and a third elastic element 242 are provided in the lock seat 24, in a state that the driving element 6 abuts against the first connecting rod 51 and the second connecting rod 52 at the same time, the lock rod 241 is located at the front side of the lock catch 61 and is at least partially limited in the lock catch 61, and the third elastic element 242 acts on the lock rod 241, so that the lock rod 241 always has a tendency of being locked in the lock catch 61. Thus, the lock catch 61 and the lock seat 24 at the front end of the housing 2 are matched, in the table cutting mode, the frame 2 can be prevented from rotating relative to the base 1 only by limiting the lock rod 241 in the lock catch 61, so that the compound saw has a stable use form in the table cutting mode, and meanwhile, the lock rod 421 located at the front side of the lock catch 61 can reversely act on the lock catch 61, so that the whole driving piece 6 keeps abutting against the first connecting rod 51 and the second connecting rod 52, and two purposes are achieved at one stroke.

In addition, referring to fig. 8, in the present embodiment, the lock lever 241 extends vertically, the middle portion of the lock lever 241 is rotatably connected in the lock base 24 through a connecting shaft 244, the bottom of the lock lever 241 is provided with a lock hook 245 extending backwards, the third elastic member 242 is disposed on the upper side of the lock lever 241 and can act on the upper end of the lock lever 241, so that the upper end of the lock lever 241 moves forwards, the rear end of the lock lever 241 moves backwards under the driving of the upper end thereof, and the lock hook 245 is hooked in the lock catch 61.

Example 2:

as shown in fig. 9, a second preferred embodiment of the present invention is different from the above embodiments in that: the lock bar 241 extends back and forth, the rear end of the lock bar 241 is provided with an end 243 adapted to the lock catch 61, and the third elastic member 242 is sleeved on the lock bar 241 and abuts against the end 243, so that the lock bar 241 is driven to move and limited in the lock catch 61.

Furthermore, directional terms, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like, may be used in the description and claims to describe various example features and elements of the invention, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims (10)

1. A compound saw, comprising:

a base (1) having a beveling station (1a) thereon;

the top of the machine frame (2) is provided with a bench cutting station (2a), the rear end of the machine frame (2) can be rotatably connected to the base (1) so that the front end of the machine frame can swing up and down relative to the base (1) to enable the compound saw to be switched between a beveling mode and a bench cutting mode;

a saw blade (3) rotatably disposed within the frame (2);

the method is characterized in that: the saw blade (3) and the rack (2) are oppositely positioned, the upper edge and the lower edge of the saw blade are respectively exposed out of the top and the bottom of the rack (2), and the bottom and the top of the rack (2) are respectively provided with a first notch (201) and a second notch (202) for the saw blade (3) to extend out along the front-back direction; and

the protection assembly comprises an upper shield (41) and a lower shield (42), wherein the upper shield (41) is arranged at the top of the rack (2) and can cover the upper edge of the saw blade (3), the lower shield (42) is arranged at the bottom of the rack (2) and can cover the lower edge of the saw blade (3), the upper shield (41) and the lower shield (42) can be reversely constrained on the rack (2) so that one of the upper edge and the lower edge of the saw blade (3) is in a covering state, the other one of the upper edge and the lower edge of the saw blade is in an exposing state, and therefore a beveling station (1a) or a bench cutting station (2a) can be selected for use.

2. The compound saw as defined in claim 1, wherein: the machine frame (2) comprises a body (21) and a table board (22) arranged at the top of the body (21), the first notch (201) is arranged at the bottom of the body (21), the second notch (202) is arranged on the table board (22), and in the state that the machine frame (2) swings upwards to a beveling mode, a first cutting edge for beveling is formed at the lower edge of the saw blade (3) extending from the first notch (201) to the lower side of the body (21); when the frame (2) swings downwards to the bench cutting state, a second cutting edge for bench cutting is formed on the upper edge of the saw blade (3) extending out of the second notch (202) to the upper part of the bench panel (22).

3. The compound saw as defined in claim 2, wherein: the rear end of the upper shield (41) can be rotatably connected to the table panel (22) and the rotating point of the upper shield is positioned at the rear side of the second cut (202), so that the front side of the upper shield can swing up and down relative to the table panel (22) to correspondingly expose or cover the second cutting edge on the upper side of the saw blade (3).

4. The compound saw as defined in claim 3, wherein: the inside of the rack (2) is hollow to form a mounting cavity (20), the lower shield (42) comprises a first shield body (421) and a second shield body (422), the first shield body (421) and the second shield body (422) are both arranged on the periphery of the saw blade (3), and the upper ends of the first shield body and the second shield body are both rotatably connected in the mounting cavity (20) so that the lower ends of the first shield body and the second shield body can move downwards to be close to each other to form a complete lower shield (42) by being jointed at the lower side of the rack (2), or move upwards to be away from each other under the action of pushing of a workpiece to respectively contract into the mounting cavity (20), and therefore the first cutting edge of the lower side of the saw blade (3) is exposed out of the first notch (201).

5. A compound saw according to any one of claims 1 to 4 wherein: still be provided with link assembly (5), first elastic component and second elastic component in frame (2), link assembly (5) are including first connecting rod (51) that is used for locking upper shield (41) and second connecting rod (52) that are used for locking lower shield (42), first elastic component is used for on first connecting rod (51), so that first connecting rod (51) have the trend of locking upper shield (41) all the time under the state that upper shield (41) overturn downwards to covering second cutting edge, the second elastic component is used in on second connecting rod (52), so that second connecting rod (52) have the trend of unblock lower shield (42) all the time, thereby make first cover body (421) and the second cover body (422) of lower shield (42) can upwards move and contract in frame (2).

6. The compound saw as defined in claim 5, wherein: the base (1) is further provided with a driving piece (6), the lower end of the driving piece (6) is constrained on the base (1) so that the upper end of the driving piece can swing up and down relative to the base (1), and the driving piece (6) can simultaneously abut against a first connecting rod (51) and a second connecting rod (52) in the connecting rod assembly (5) in an upward swinging state so that the first connecting rod (51) is in a state of unlocking the upper shield (41) and the second connecting rod (52) is in a state of locking the lower shield (42), and therefore the first cover body (421) and the second cover body (422) of the lower shield (42) are limited to retract towards the inside of the mounting cavity (20) so as to cover the lower edge of the saw blade (3).

7. The compound saw as defined in claim 6, wherein: the first connecting rod (51) and the second connecting rod (52) are located on the lateral side of the saw blade (3), an opening (23) for the first connecting rod (51) and the second connecting rod (52) to extend out is formed in the front end wall of the rack (2), and when the compound saw is in a bench cutting mode, the upper end of the driving piece (6) swings to the opening (23) so as to abut against the first connecting rod (51) and the second connecting rod (52) at the same time.

8. The compound saw as defined in claim 7, wherein: the first connecting rod (51) comprises a horizontal section (511) and a vertical section (512), wherein the front end of the horizontal section (511) is located at an opening (23) of the front side end wall of the rack (2), the vertical section (512) is arranged at the rear end of the horizontal section (511) to form an L-shaped structure, a first rotating shaft (513) penetrates through the middle of the horizontal section (511), the first connecting rod (51) is rotatably installed in the installation cavity (20) through the first rotating shaft (513), and in a bench cutting mode, the top of the driving piece (6) can abut against the bottom of the front end of the horizontal section (511), so that the rear end of the horizontal section (511) drives the vertical section (512) to swing downwards to be separated from a swing path of the front side of the upper shield (41).

9. The compound saw as defined in claim 8, wherein: the free end of the driving piece (6) is provided with a lock catch (61), a lock seat (24) is arranged at the front end of the rack (2) correspondingly, a lock rod (241) and a third elastic piece (242) are arranged in the lock seat (24), the driving piece (6) is abutted to the first connecting rod (51) and the second connecting rod (52) at the same time, the lock rod (241) is located on the front side of the lock catch (61) and is limited in the lock catch (61) at least partially, and the third elastic piece (242) acts on the lock rod (241) so that the lock rod (241) always has a tendency of being only in the lock catch (61).

10. The compound saw as defined in claim 9, wherein: the second connecting rod (52) is transversely arranged, two convex columns (521) which are arranged at intervals are arranged on the second connecting rod, in a table cutting mode, the driving piece (6) swings upwards to the side part to abut against the front end of the second connecting rod (52), so that the second connecting rod (52) transversely moves, the two convex columns (521) are respectively positioned on the upward moving paths of the first cover body (421) and the second cover body (422), so that the first cover body (421) and the second cover body (422) are in a downward moving joint state, and a complete lower protective cover (42) state is formed.

Images