A band saw with a blade protection device

Abstract

The application discloses a composite saw with a band saw blade protection device, wherein a periphery cover of the saw blade is provided with a front protection cover and a rear protection cover; the rear protection cover is fixedly connected with a base; the front protection cover comprises a first cover body and a second cover body which are arranged in a split mode; the second cover body is located between the rear protection cover and the first cover body; the upper end of the first cover body and the center of the second cover body are respectively hinged to a frame; and the first cover body swings between a first position and a second position relative to the frame. The rear protection cover is fixedly connected with the base; when the frame performs a downward pressing action, the second cover body swings upward relative to the first cover body under the action of a linkage rod; when the frame performs an upward tilting action, the second cover body swings downward relative to the first cover body under the action of a torsional spring; the linkage structure of the protection device is highly simplified; redundant components and complicated connection modes in the traditional complex linkage structure are abandoned; material, processing and assembly costs are effectively reduced; and meanwhile, the simplified structure reduces the probability of mechanical failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric saws, and particularly relates to a compound saw with saw blade protection device. BACKGROUND

[0002] A compound saw is a common electric cutting tool, which can be switched to two different working states of miter saw and table saw respectively. The existing compound saw comprises a saw blade, a movable table plate (i.e. a table cutting workbench) and a base (i.e. a miter cutting workbench). When the compound saw is in the table cutting working state, the material is cut from the movable table plate above the compound saw, and when the compound saw is in the miter cutting working state, the material is cut from the base below the compound saw. According to the current safety standards, the saw blade edge of the electric miter saw and the table saw should be ensured not to be exposed and not to be touched in the non-working state. For the compound saw, when it is switched to the table cutting or miter cutting working state, the saw blade edge corresponding to the other working state should be ensured not to be exposed and not to be touched.

[0003] The existing compound saw, when the compound saw is in the miter cutting mode, a protective cover for protecting the lower edge of the saw blade is installed on the frame. The protective cover usually comprises a front cover and a rear cover, and the front cover and the rear cover are usually of a split structure. When the distal hinged end of the frame is raised, the front cover and the rear cover are folded to each other to cover the edge of the saw blade in the protective cover. When the raised end of the frame is pressed down, the front cover and the rear cover are gradually opened, and the protective cover has the maximum opening amount when the frame is parallel to the base, so as to expose the edge of the saw blade for cutting work.

[0004] For example, a compound saw disclosed in Chinese patent (publication number: CN105081453A) comprises a frame, a saw blade for cutting workpieces, and a saw blade protection cover assembly sleeved on the saw blade. The saw blade protection cover assembly is composed of a front cover and a rear cover. The front cover and the rear cover can rotate around the same axis as the center of the saw blade. During the lifting of the saw blade relative to the frame, the saw blade protection cover assembly is linked with the saw blade through a linkage mechanism, so that when the saw blade is lifted relative to the frame, the front cover and the rear cover are switched from the open state to the folded state, and when the saw blade is lowered relative to the frame, the front cover and the rear cover are switched from the folded state to the open state. The linkage mechanism comprises a linkage rod and a protective cover linkage rod assembly. The protective cover linkage rod assembly is composed of at least three linkage rods. The outer end of the first linkage rod is hinged with the rocker frame seat, the outer end of the second linkage rod is hinged with the front cover, and the outer end of the third linkage rod is hinged with the rear cover.

[0005] But the above prior art disclosed a compound saw, the saw blade guard assembly through linkage mechanism and saw blade linkage, linkage mechanism includes linkage rod and guard linkage rod assembly, the structure design of the linkage mechanism is more complex, has the following disadvantages: ① complex structure causes the number of parts increases, not only increases the production and assembly difficulty, increases the manufacturing cost, also makes linkage mechanism occupies space increases, limits the overall compact design of the compound saw;② the combination of a large number of precision parts significantly improves the probability of mechanical failure, in the long-term use process, the wear and tear, loose problem between components frequently, increases the maintenance frequency and repair cost of the compound saw, and when repairing, professional technical personnel need to disassemble the complex structure to check, time consuming and laborious. ③ complex linkage mechanism in operation, there are parts jam, response delay risk, may lead to the guard cannot follow the saw blade action in time, reduces the timeliness and effectiveness of protection, brings potential safety hazard to the operator.

[0006] Therefore, it is necessary to improve the prior art. SUMMARY

[0007] The purpose of the present application is to overcome the defects and deficiencies of the prior art, provide a kind of compound saw with saw blade protection device, rear guard is fixedly connected with base, the front guard includes the first cover body and second cover body of split setting, when the frame does down pressure action, the second cover body is swung upward relative to the first cover body under the action of linkage rod, when the frame does upwarp action, the second cover body is swung downward relative to the first cover body under the action of torsion spring, so that linkage structure is simple, effectively reduce the cost of material, processing and assembly.

[0008] To achieve the above object, the present application adopts the following technical scheme:

[0009] A band saw with a saw blade protection device, comprising a base, a frame and a head assembly, the head assembly having a saw blade accommodated in the frame and partially exposed outside the frame, the periphery of the saw blade being covered by a front guard and a rear guard, the rear guard being fixedly connected with the base, the front guard comprising a first cover body and a second cover body arranged in a split manner, the second cover body being located between the first cover body and the rear guard, the upper end of the first cover body and the center of the second cover body being respectively hinged to the frame, a linkage rod being hinged between the second cover body and the base; when the frame is subjected to a downward action, the first cover body moves downward synchronously with the frame, and the second cover body swings upward relative to the first cover body; when the frame is subjected to an upward action, the first cover body moves upward synchronously with the frame, and the second cover body swings downward relative to the first cover body; the first cover body swings relative to the frame between a first position and a second position, when the first cover body is located at the first position, the first cover body and the second cover body are in position cooperation to limit the upward swing of the second cover body, and the lower end of the second cover body is in abutting cooperation with the rear guard; when the first cover body is located at the second position, the first cover body and the second cover body are in misposition cooperation to release the position limitation of the second cover body; an elastic locking mechanism is arranged between the frame and the first cover body, the elastic locking mechanism makes the first cover body always have a tendency to move towards the first position.

[0010] Further, one end of the linkage rod is eccentrically hinged to the second cover body, and the other end of the linkage rod is hinged to the base.

[0011] Further, the linkage rod is provided with a waist-shaped hole, the linkage rod is hinged to the base through the waist-shaped hole; a torsion spring is arranged between the second cover body and the frame, the torsion spring makes the second cover body always have a tendency to swing downward relative to the frame; when the frame is subjected to a downward action, the second cover body swings upward relative to the first cover body under the action of the linkage rod, and when the frame is subjected to an upward action, the second cover body swings downward relative to the first cover body under the action of the torsion spring.

[0012] Further, when the first cover body is located at the first position, the lower end of the first cover body is in abutting cooperation with the upper edge of the second cover body, the lower end of the first cover body is provided with a first protrusion in abutting cooperation with the upper edge of the second cover body; when the first cover body is located at the second position, the second cover body is covered outside the first cover body.

[0013] Further, the elastic locking mechanism comprises a transmission rod and a compression spring, the transmission rod is fixedly connected with the first cover body, and the compression spring is arranged between the frame and the first cover body to make the first cover body always have a tendency to move towards the first position.

[0014] Further, the first cover body is provided with a first stop block, the frame is provided with a second stop block in corresponding cooperation with the first stop block, and the transmission rod and the compression spring are sequentially arranged between the first stop block and the second stop block.

[0015] Furthermore, the transmission rod is fixedly connected to the first stopper via a bolt, and the compression spring is sleeved on the outer circumference of the bolt.

[0016] Furthermore, the rear protective cover is provided with a supporting portion that abuts against the lower end of the second cover body.

[0017] Furthermore, it also includes a movable platform and a follower shield, and the follower shield is fixedly connected to the lower end surface of the movable platform.

[0018] Furthermore, the follower guard has a third position and a fourth position relative to the saw blade. When the follower guard is located at the third position, the follower guard blocks the cutting edge of the upper end of the saw blade, and the cutting edge of the lower end of the saw blade extends out of the follower guard; when the follower guard is located at the fourth position, the follower guard blocks the cutting edge of the lower end of the saw blade, and the cutting edge of the upper end of the saw blade extends out of the follower guard.

[0019] After adopting the above structure, the beneficial effects of the present invention are as follows: the compound saw with a saw blade protection device described in the present invention, the outer peripheral cover of the saw blade is provided with a front protective cover and a rear protective cover, the rear protective cover is fixedly connected to the base, the front protective cover includes a first cover body and a second cover body which are separately arranged, the second cover body is located between the first cover body and the rear protective cover, the upper end of the first cover body and the center of the second cover body are respectively hinged to the frame; the first cover body swings between a first position and a second position relative to the frame, when the first cover body is in the first position, the first cover body and the second cover body are limited and matched to limit the second cover body from swinging upward, and the lower end of the second cover body is abutted against the rear protective cover; when the first cover body is in the second position, the first cover body and the second cover body are staggered and matched to release the limitation on the second cover body. The rear protective cover of the present invention is fixedly connected to the base. When the frame performs a downward pressing action, the second cover body swings upward relative to the first cover body under the action of the linkage rod. When the frame performs an upward tilting action, the second cover body swings downward relative to the first cover body under the action of the torsion spring, thereby achieving a highly simplified linkage structure of the protective device, abandoning the redundant components and cumbersome connection methods in the traditional complex linkage structure, and effectively reducing the material, processing and assembly costs; at the same time, the streamlined structure reduces the probability of mechanical failure, ensuring that it can still maintain a stable and accurate operating state in long-term high-frequency use scenarios, and is both economical and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present application, the following will briefly introduce the drawings required to be used in the specific embodiments. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 is the overall structure schematic of the present application Figure 1 (composite saw is in bevel cut mode);

[0022] Figure 2 is the overall structure schematic of the present application Figure 2 (composite saw is in bevel cut mode);

[0023] Figure 3 is the frame, elastic locking mechanism, rear shield and front shield of the present application

[0024] Figure 4 is the cooperation connection schematic of the front shield and the rear shield of the present application Figure 1 (the first shield is in the first position);

[0025] Figure 5 is the cooperation connection sectional view of the front shield and the rear shield of the present application (the first shield is in the first position);

[0026] Figure 6 is the cooperation connection schematic of the first shield and the second shield of the present application (the first shield is in the second position);

[0027] Figure 7 is the cooperation connection schematic of the base, frame, elastic locking mechanism, rear shield and front shield of the present application;

[0028] Figure 8 is the cooperation connection schematic of the present application Figure 7 of the A structure enlarged schematic;

[0029] Figure 9 is the three-dimensional schematic of the second shield of the present application;

[0030] Figure 10 is the three-dimensional schematic of the first shield of the present application;

[0031] Figure 11 is the three-dimensional schematic of the rear shield of the present application;

[0032] Figure 12 is the cooperation connection schematic of the present application Figure 1 (the follow-up shield is in the third position);

[0033] Figure 13Is the invention of the follow-up shield, saw blade and movable table board cooperation connection schematic Figure 2 (Follow-up shield in the fourth position);

[0034] Figure 14 Is the invention of the follow-up shield and movable table board cooperation connection schematic;

[0035] Figure 15 Is the invention of the follow-up shield of the explosion diagram;

[0036] Figure 16 Is the invention of the overall structure schematic Figure 3 (Composite saw in the table cutting mode).

[0037] Figures 1 to 16 The middle serial number is:

[0038] 1, base; 11, base support; 2, frame; 21, second stop block; 22, second plug-in hole; 23, square hole; 3, saw blade; 4, front shield; 41, first cover body; 411, first protrusion; 412, first stop block; 4121, stop edge; 413, second protrusion; 4131, clamping block; 4132, second inclined surface; 414, first hinged hole; 42, second cover body; 421, protruding rib; 4211, first inclined surface; 422, clamping groove; 423, second hinged hole; 424, first plug-in hole; 5, rear shield; 51, bearing part; 52, first guard plate; 53, second guard plate; 54, accommodating cavity; 6, elastic locking mechanism; 61, transmission rod; 62, compression spring; 63, bolt; 7, linkage rod; 71, waist-shaped hole; 72, screw rod; 8, torsional spring; 81, first grappling hook; 82, second grappling hook; 9, movable table board; 10, follow-up shield; 101, connecting part; 102, accommodating space; 103, notched structure; 104, first cover plate; 1041, first limiting part; 1042, avoiding hole; 1043, strip-shaped hole; 1044, circular hole; 105, second cover plate; 1051, second limiting part; 1052, accommodating groove; 1053, sealing strip. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0040] In the description of the application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0041] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one feature. In the description of the application, if the term "a plurality of" appears, the meaning of the term "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, if there is a description such as "on" or "under" the first feature of the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only implementation method.

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] like Figures 1 to 16The composite saw with the band saw blade protection device is shown, which comprises a base 1, a frame 2, and a head assembly, the head assembly has a saw blade 3 accommodated in the frame 2 and partially exposed outside the frame 2, the outer periphery of the saw blade 3 is covered with a front protective cover 4 and a rear protective cover 5, the rear protective cover 5 is fixedly connected with the base 1, the front protective cover 4 comprises a first cover body 41 and a second cover body 42 arranged in a split manner, the second cover body 42 is located between the first cover body 41 and the rear protective cover 5, the upper end of the first cover body 41 and the center of the second cover body 42 are respectively hinged to the frame 2, and a linkage rod 7 is hinged between the second cover body 42 and the base 1; when the frame 2 performs a downward action, the first cover body 41 moves downward synchronously with the frame 2, and the second cover body 42 swings upward relative to the first cover body 41; when the frame 2 performs an upward action, the first cover body 41 moves upward synchronously with the frame 2, and the second cover body 42 swings downward relative to the first cover body 41; the first cover body 41 swings relative to the frame 2 between a first position and a second position, when the first cover body 41 is located at the first position, the first cover body 41 is limitedly matched with the second cover body 42 to limit the upward swinging of the second cover body 42, and the lower end of the second cover body 42 is abuttingly matched with the rear protective cover 5; when the first cover body 41 is located at the second position, the first cover body 41 is mismatched with the second cover body 42 to release the limitation on the second cover body 42; a resilient locking mechanism 6 is arranged between the frame 2 and the first cover body 41, the resilient locking mechanism 6 makes the first cover body 41 always have a tendency to move towards the first position. One end of the linkage rod 7 is eccentrically hinged to the second cover body 42, and the other end of the linkage rod 7 is hinged to the base 1. The linkage rod 7 is provided with a waist-shaped hole 71, and the linkage rod 7 is hinged to the base 1 through the waist-shaped hole 71; a torsion spring 8 is arranged between the second cover body 42 and the frame 2, the torsion spring 8 makes the second cover body 42 always have a tendency to swing downward relative to the frame 2; when the frame 2 performs a downward action, the second cover body 42 swings upward relative to the first cover body 41 under the action of the linkage rod 7, and when the frame 2 performs an upward action, the second cover body 42 swings downward relative to the first cover body 41 under the action of the torsion spring 8.

[0047] Based on the above embodiment, the application provides a composite saw with a band saw blade protection device, the outer periphery cover of the saw blade 3 is provided with a front protective cover 4 and a rear protective cover 5, the rear protective cover 5 is fixedly connected with the base 1, the front protective cover 4 comprises a first cover body 41 and a second cover body 42 which are arranged in a split manner, the second cover body 42 is located between the first cover body 41 and the rear protective cover 5, the upper end of the first cover body 41 and the center of the second cover body 42 are respectively hinged to the frame 2; the first cover body 41 swings relative to the frame 2 between a first position and a second position, when the first cover body 41 is located at the first position, the first cover body 41 is limitedly matched with the second cover body 42 to limit the upward swing of the second cover body 42, and the lower end of the second cover body 42 is matched with the rear protective cover 5; when the first cover body 41 is located at the second position, the first cover body 41 is mismatched with the second cover body 42 to release the limitation of the second cover body 42. The rear protective cover 5 of the application is fixedly connected with the base 1, when the frame 2 performs a downward action, the second cover body 42 swings upward relative to the first cover body 41 under the action of the linkage rod 7, when the frame 2 performs an upward action, the second cover body 42 swings downward relative to the first cover body 41 under the action of the torsional spring 8, the linkage structure of the protection device is highly simplified, the redundant components and the complicated connection mode in the traditional complex linkage structure are abandoned, the material, processing and assembly costs are effectively reduced; at the same time, the simplified structure reduces the probability of mechanical failure, ensures that the stable and accurate operation state can be maintained in the long-term high-frequency use scene, and has economy and reliability.

[0048] In the embodiment, as shown in Figure 3 The linkage rod 7 is arranged between the second cover body 42 and the base 1, specifically, the base 1 is provided with a base support 11, one end of the linkage rod 7 is hinged with the second cover body 42, the other end of the linkage rod 7 is hinged with the base support 11. When the frame 2 is raised or pressed, the second cover body 42 swings downward or upward relative to the first cover body 41 under the driving of the linkage rod 7.

[0049] In a further preferred embodiment, the linkage rod 7 is provided with a waist-shaped hole 71, and a screw rod 72 is arranged in the waist-shaped hole 71 and fixedly connected to the base support 11 through the waist-shaped hole 71. The arrangement of the waist-shaped hole 71 can realize manual up-and-down swinging of the second cover body 42, so as to facilitate replacement of the saw blade 3. In this embodiment, since the arrangement of the waist-shaped hole 71 makes the linkage rod 7 unable to drive the second cover body 42 to swing downward when the frame 2 is tilted upward, a torsion spring 8 is arranged between the second cover body 42 and the frame 2. A first hook 81 is arranged at a first end of the torsion spring 8, and the second cover body 42 is provided with a first plug hole 424 for plug-in cooperation with the first hook 81; a second hook 82 is arranged at a second end of the torsion spring 8, and the frame 2 is provided with a second plug hole 22 for plug-in cooperation with the second hook 82. When the frame 2 is tilted upward, the second cover body 42 swings downward under the elastic force of the torsion spring 8; when the frame 2 is pressed downward, the second cover body 42 swings upward under the driving of the linkage rod 7 and against the elastic force of the torsion spring 8.

[0050] In a further preferred embodiment, the upper end of the first cover body 41 is provided with a first hinge hole 414, and the first cover body 41 swings between the first position and the second position relative to the frame 2 with the first hinge hole 414 as a first hinge point; the center of the second cover body 42 is provided with a second hinge hole 423, and the second cover body 42 swings upward and downward relative to the first cover body 41 with the second hinge hole 423 as a second hinge point. As shown in Figure 1 and Figure 3 When installed, a first screw is arranged in the first hinge hole 414 to provide a fulcrum for rotation of the first cover body 41; and a second screw is arranged in the second hinge hole 423 to provide a fulcrum for rotation of the second cover body 42.

[0051] As another preferred scheme of the present application, when the first cover body 41 is in the first position, the lower end of the first cover body 41 abuts against the upper edge of the second cover body 42; when the first cover body 41 is in the second position, the second cover body 42 is arranged outside the first cover body 41. The lower end of the first cover body 41 is provided with a first protrusion 411 which abuts against the upper edge of the second cover body 42. The front protective cover 4 comprises the first cover body 41 and the second cover body 42 which are arranged in a split manner, and when the first cover body 41 is in the first position, the lower end of the first cover body 41 is in position-limiting cooperation with the upper edge of the second cover body 42, so that the front protective cover 4 as a whole has a large arc length (i.e., a large central angle), and the first cover body 41, the second cover body 42 and the rear protective cover 5 are sequentially connected, thereby making the front protective cover 4 and the rear protective cover 5 cooperate to shield all the cutting edges of the saw blade 3, as shown in Figure 4As shown in the figures; when the first cover body 41 is in the second position, the first cover body 41 is misaligned with the second cover body 42 to release the limiting of the second cover body 42, the second cover body 42 swings upward with the depression of the frame 2 and covers the outside of the first cover body 41, at this time, the end of the second cover body 42 and the rear protective cover 5 form a cutting area for the blade edge of the saw blade 3 to expose, so that the front protective cover 4 has a smaller arc length (i.e. a smaller central angle), and thus the lower end thereof does not interfere with the workpiece to be cut, as shown in the figures. Figure 2 and Figure 6 .

[0052] In the embodiment, when the first cover body 41 is in the first position, the first cover body 41 is limited and matched with the second cover body 42 by the first protrusion 411. In a further embodiment, the upper end of the second cover body 42 is provided with a protrusion 421, and a clamping groove 422 is formed between every two adjacent protrusions 421; the lower end of the first cover body 41 is provided with a second protrusion 413, the second protrusion 413 is provided with a clamping block 4131, the clamping block 4131 is clamped and matched with the clamping groove 422; the protrusion 421 is provided with a first inclined surface 4211, and the second protrusion 413 is provided with a second inclined surface 4132, the first inclined surface 4211 is matched with the second inclined surface 4132. As shown in the figures, when the lower end of the first cover body 41 is matched with the upper end of the second cover body 42, i.e. the first protrusion 411 of the first cover body 41 is matched with the upper edge of the second cover body 42, the clamping block 4131 of the second protrusion 413 is clamped into the clamping groove 422, the first inclined surface 4211 of the protrusion 421 is matched with the second inclined surface 4132 of the second protrusion 413, thereby improving the stability of the clamping of the first cover body 41 and the second cover body 42, so that the first cover body 41 can reliably limit the second cover body 42. Figure 4 , Figure 9 and Figure 10 .

[0053] As another preferred scheme of the present application, the elastic locking mechanism 6 comprises a transmission rod 61 and a compression spring 62, the transmission rod 61 is fixedly connected with the first cover body 41, and the compression spring 62 is arranged between the frame 2 and the first cover body 41, so that the first cover body 41 always has a tendency to move towards the first position. The first cover body 41 is provided with a first stop block 412, the frame 2 is provided with a second stop block 21 corresponding to the first stop block 412, and the transmission rod 61 and the compression spring 62 are sequentially arranged between the first stop block 412 and the second stop block 21. The transmission rod 61 is fixedly connected to the first stop block 412 by a bolt 63, and the compression spring 62 is sleeved on the outer periphery of the bolt 63. In the embodiment, as shown in the figures, the transmission rod 61 is provided with a first protrusion 611, and the first stop block 412 is provided with a second protrusion 4121 corresponding to the first protrusion 611, the first protrusion 611 of the transmission rod 61 is matched with the second protrusion 4121 of the first stop block 412, and the compression spring 62 is sleeved on the outer periphery of the bolt 63. Figure 7As shown in the figure, the first cover body 41 is provided with a first block 412, the frame 2 is provided with a second block 21 corresponding to the first block 412, and the transmission rod 61 and the compression spring 62 are sequentially arranged between the first block 412 and the second block 21. The transmission rod 61 is fixedly connected to the first block 412 through a bolt 63, and the compression spring 62 is sleeved on the outer periphery of the bolt 63. The first block 412 is provided with a blocking edge 4121 for limiting the rotation of the transmission rod 61. In this embodiment, as shown in the figure, Figure 7 and Figure 8 As shown in the figure, a square hole 23 is formed in the frame 2, the second block 21 is located on one side of the square hole 23, the first block 412 protrudes from the square hole 23 and is located on the other side of the square hole 23, so that the first block 412 and the second block 21 are oppositely arranged, and the transmission rod 61 is fixedly connected to the first block 412. When pressure is applied to the transmission rod 61, the first block 412 is subjected to pressure, so that the first block 412 moves towards the second block 21, that is, the first cover body 41 moves away from the second cover body 42, until the first protrusion 411 of the first cover body 41 is disengaged from the abutting cooperation with the upper edge of the second cover body 42, thereby releasing the limitation of the first cover body 41 on the second cover body 42. When the pressure on the transmission rod 61 is released, the first block 412 and the transmission rod 61 move away from the second block 21 under the elastic force of the compression spring 62, that is, the first cover body 41 moves towards the second cover body 42, and when the second cover body 42 swings downward to the position where the upper edge thereof is aligned with the first protrusion 411 of the first cover body 41, the first protrusion 411 and the upper edge of the second cover body 42 are automatically abutted to realize the limitation of the first cover body 41 on the second cover body 42. In this embodiment, the first block 412 is provided with a blocking edge 4121, and when the transmission rod 61 is fixedly connected to the first block 412, the blocking edge 4121 limits the transmission rod 61 to limit the rotation of the transmission rod 61.

[0054] As another preferred embodiment of the present application, the rear protective cover 5 is provided with a supporting portion 51 abutting with the lower end of the second cover body 42. In this embodiment, as shown in the figure, Figure 5 and Figure 11 When the first cover body 41 is located at the first position, the upper end of the second cover body 42 and the lower end of the first cover body 41 are abutted through the first protrusion 411, and the lower end of the second cover body 42 and the rear protective cover 5 are abutted through the supporting portion 51, so that the cooperation between the second cover body 42 and the first cover body 41 and the rear protective cover 5 is reliable and stable. In a further preferred embodiment, the rear protective cover 5 comprises a first protective plate 52 and a second protective plate 53, and the first protective plate 52 and the second protective plate 53 cooperatively form a receiving cavity 54 for accommodating the rear blade edge of the saw blade 3.

[0055] As another preferred embodiment of the present application, the movable table plate 9 and the following guard 10 are further included, and the following guard 10 is fixedly connected to the lower end surface of the movable table plate 9. The following guard 10 has a third position and a fourth position relative to the saw blade 3. When the following guard 10 is in the third position, the upper end of the saw blade 3 is shielded by the following guard 10, and the lower end of the saw blade 3 is exposed from the following guard 10. When the following guard 10 is in the fourth position, the lower end of the saw blade 3 is shielded by the following guard 10, and the upper end of the saw blade 3 is exposed from the following guard 10. In the embodiment, as shown in Figs. 10 and 11, the following guard 10 is designed to be elongated, so that the protection range of the following guard 10 is larger, and the blade of the saw blade 3 can be effectively protected by the following guard 10 in both the table cutting state and the bevel cutting state. As shown in Figs. 12 and 13, when the compound saw is in the bevel cutting state, i.e. the following guard 10 is in the third position, the upper end of the saw blade 3 is shielded by the following guard 10, and at this time, the movable table plate 9 is arranged at an angle relative to the base 1. As shown in Figs. 14 and 15, when the compound saw is in the table cutting state, i.e. the following guard 10 is in the fourth position, the lower end of the saw blade 3 is shielded by the following guard 10, and at this time, the movable table plate 9 is arranged in parallel relative to the base 1. In the embodiment, the following guard 10 is fixedly connected to the lower end surface of the movable table plate 9, and when the installation height of the movable table plate 9 is adjusted, the following guard 10 moves up and down with the movable table plate 9, so that the synchronous adjustment of the working position of the movable table plate 9 is realized. When the movable table plate 9 is locked, the position of the following guard 10 is locked, so that the following guard 10 is easy to adjust and operate. Figure 12 Figure 1 Figure 12 Figure 13 Figure 16

[0056] In a further preferred embodiment, the upper end of the following guard 10 is provided with a connection part 101 bent outward, and the following guard 10 is detachably fixedly connected to the movable table plate 9 through the connection part 101. In the embodiment, as shown in Figs. 16 and 17, the following guard 10 is detachably connected to the movable table plate 9 through the connection part 101, so that the processing and assembly of the following guard 10 are facilitated, and the maintenance and replacement of the following guard 10 are facilitated. The connection part 101 is in a bent shape, so that the stability of the installation of the following guard 10 relative to the movable table plate 9 is increased, and the shaking of the following guard 10 is reduced. Figure 14 Figure 15

[0057] ​​​​​​​In a further preferred embodiment, the follow-up guard 10 comprises a first cover plate 104 and a second cover plate 105, and an accommodation space 102 is formed between the first cover plate 104 and the second cover plate 105 for accommodating the saw blade 3. The two side edges of the first cover plate 104 are provided with first limiting portions 1041 which are bent inwardly, and the two side edges of the second cover plate 105 are provided with second limiting portions 1051 which are bent inwardly, and the first limiting portions 1041 correspondingly cooperate with the second limiting portions 1051. In this embodiment, as shown in Figure 14 and Figure 15 the first limiting portions 1041 correspondingly cooperate with the second limiting portions 1051 to limit the relative distance between the first cover plate 104 and the second cover plate 105, thereby limiting the width of the accommodation space 102 and reducing the shaking of the first cover plate 104 and the second cover plate 105 during operation.

[0058] In a further preferred embodiment, the second cover plate 105 is provided with a clearance slot 1052 through which the output shaft of the driver of the compound saw passes, and the clearance slot 1052 can accommodate the output shaft of the driver when the follow-up guard 10 moves up and down relative to the saw blade 3. The opening of the clearance slot 1052 is provided with a sealing strip 1053 which is detachably connected with the second cover plate 105. In this embodiment, as shown in Figure 15 the clearance slot 1052 is provided for the output shaft of the driver of the compound saw to pass through the second cover plate 105 and move up and down relative to the second cover plate 105. The sealing strip 1053 can prevent the areas on both sides of the clearance slot 1052 of the second cover plate 105 from being deformed and scratching the saw blade 3, thereby improving the safety of the follow-up guard 10 in use and reducing the shaking of the second cover plate 105 during operation of the compound saw. In this embodiment, the driver is a motor, the output shaft of the driver is the output shaft of the motor, and the saw blade 3 is fixedly installed on the output shaft of the motor. When the motor drives the output shaft to rotate, the saw blade 3 is driven to rotate synchronously.

[0059] In a further preferred embodiment, the first cover plate 104 is provided with an avoiding hole 1042 which comprises a strip-shaped hole 1043 and a circular hole 1044, and the strip-shaped hole 1043 and the circular hole 1044 are sequentially arranged from top to bottom and communicate with each other. In this embodiment, as shown in Figure 15 the strip-shaped hole 1043 is provided for the output shaft of the driver of the compound saw to pass through and move up and down, and the circular hole 1044 facilitates the disassembly of the saw blade 3, and the components such as the blocking piece and the nut for fixing the saw blade 3 are disassembled through the circular hole 1044.

[0060] In a further preferred embodiment, the corner of the lower end of the follow-up guard 10 is provided with a corner-omitted structure 103. In this embodiment, as shown inFigure 12 and Figure 14 As shown in FIG. 10, the arrangement of the notched structure 103 is such that when the trailing guard 10 is in the third position, i.e. the compound saw is in the bevel mode, as much of the blade 3 as possible is in contact with the workpiece being cut, improving cutting efficiency.

[0061] Obviously, the above-described embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary or possible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A compound saw with a saw blade protection device, comprising a base, a frame, and a head assembly, wherein the head assembly has a saw blade housed within the frame and partially exposed outside the frame, characterized in that: The outer peripheral cover of the saw blade is provided with a front guard cover and a rear guard cover, the rear guard cover is fixedly connected to the base, the front guard cover includes a first cover body and a second cover body which are separately provided, the second cover body is located between the first cover body and the rear guard cover, the upper end of the first cover body and the center of the second cover body are respectively hinged to the frame, a linkage rod is hinged between the second cover body and the base, the linkage rod is provided with a waist-shaped hole, one end of the linkage rod is eccentrically hinged to the second cover body, and the other end of the linkage rod is hinged to the base through the waist-shaped hole; a torsion spring is provided between the second cover body and the frame, and the torsion spring enables the second cover body to always have a downward swinging tendency relative to the frame; When the frame performs a downward pressing action, the first cover body moves downward synchronously with the frame, and the second cover body swings upward relative to the first cover body under the action of the linkage rod; when the frame performs an upward tilting action, the first cover body moves upward synchronously with the frame, and the second cover body swings downward relative to the first cover body under the action of the torsion spring; The first cover body swings between a first position and a second position relative to the frame. When the first cover body is in the first position, the first cover body and the second cover body are limited and matched to limit the second cover body from swinging upward, and the lower end of the second cover body is abutted against the rear protective cover. When the first cover body is in the second position, the first cover body and the second cover body are staggered and matched to release the limit on the second cover body. An elastic locking mechanism is provided between the frame and the first cover body, and the elastic locking mechanism includes a transmission rod and a compression spring. The transmission rod is fixedly connected to the first cover body, and the compression spring is arranged between the frame and the first cover body so that the first cover body always has a tendency to move toward the first position.

2. A compound saw with a saw blade protection device according to claim 1, characterized in that: When the first cover body is in the first position, the lower end of the first cover body is in abutment with the upper edge of the second cover body, and the lower end of the first cover body is provided with a first protrusion that is in abutment with the upper edge of the second cover body; when the first cover body is in the second position, the second cover body is covered on the outside of the first cover body.

3. The compound saw with a saw blade protection device according to claim 1, characterized in that: The first cover body is provided with a first stopper, the frame is provided with a second stopper corresponding to the first stopper, and the transmission rod and the compression spring are sequentially provided between the first stopper and the second stopper.

4. A compound saw with a saw blade protection device according to claim 3, characterized in that: The transmission rod is fixedly connected to the first stopper via a bolt, and the compression spring is sleeved on the outer periphery of the bolt.

5. The compound saw with a saw blade protection device according to claim 1, characterized in that: The rear protective cover is provided with a supporting portion which abuts against the lower end of the second cover body.

6. The compound saw with a saw blade protection device according to claim 1, characterized in that: The utility model also comprises a movable platform and a follower shield, wherein the follower shield is fixedly connected to the lower end surface of the movable platform.

7. A compound saw with a saw blade protection device according to claim 6, characterized in that: The movable guard has a third position and a fourth position relative to the saw blade. When the movable guard is located at the third position, the movable guard blocks the cutting edge of the upper end of the saw blade, and the cutting edge of the lower end of the saw blade extends out of the movable guard; when the movable guard is located at the fourth position, the movable guard blocks the cutting edge of the lower end of the saw blade, and the cutting edge of the upper end of the saw blade extends out of the movable guard.

Images