阅读说明：本技术 一种高效手工锯削装置 (High-efficient manual sawing device ) 是由 宁佶 于 2021-08-16 设计创作，主要内容包括：本发明公开一种手工锯削装置,包括钢锯和支架组,支架组包括门形架、钢锯调节用支架和连接件；连接件包括第一安装部和第二安装部,第一安装部装在门形架上,第二安装部设有圆形凹槽,凹槽中设第一通孔,凹槽内放锯削角度调节柱,锯削角度调节柱上设第二通孔,第二通孔孔壁上设凸条,第二安装部上设刻度线和指针；钢锯调节用支架包括纵向导轨、横向套管、两防歪轴承支柱,横向套管套在锯梁上,上侧部与纵向导轨下端转动连接,两防歪轴承支柱上端连在横向套管,下端分叉设置轴承,轴承水平,锯条位于两轴承间,轴承位于锯齿上方；纵向导轨上设纵向槽,纵向导轨穿过第一通孔及第二通孔,与锯削角度调节柱纵向凸条嵌合,纵向导轨可纵向移动。(The invention discloses a manual sawing device which comprises a hacksaw and a support group, wherein the support group comprises a portal frame, a support for adjusting the hacksaw and a connecting piece; the connecting piece comprises a first mounting part and a second mounting part, the first mounting part is mounted on the door-shaped frame, the second mounting part is provided with a circular groove, a first through hole is formed in the groove, a sawing angle adjusting column is arranged in the groove, a second through hole is formed in the sawing angle adjusting column, a convex strip is arranged on the wall of the second through hole, and a scale mark and a pointer are arranged on the second mounting part; the steel saw adjusting bracket comprises a longitudinal guide rail, a transverse sleeve and two anti-skew bearing support columns, wherein the transverse sleeve is sleeved on a saw beam, the upper side part of the transverse sleeve is rotatably connected with the lower end of the longitudinal guide rail, the upper ends of the two anti-skew bearing support columns are connected with the transverse sleeve, the lower end of the two anti-skew bearing support columns is provided with a bearing in a forked manner, the bearing is horizontal, a saw blade is positioned between the two bearings, and the bearing is positioned above sawteeth; the longitudinal guide rail is provided with a longitudinal groove, the longitudinal guide rail penetrates through the first through hole and the second through hole and is embedded with the longitudinal convex strip of the sawing angle adjusting column, and the longitudinal guide rail can move longitudinally.)

1. A high-efficiency manual sawing device is characterized by comprising a hacksaw with a saw beam and a saw blade and a bracket group for supporting the hacksaw, wherein the bracket group comprises a portal frame which is used for being arranged on a workbench and is provided with two support legs and a top cross beam, a hacksaw adjusting bracket and a connecting piece for connecting the portal frame and the hacksaw adjusting bracket;

the connecting piece is formed by connecting a first mounting part and a second mounting part, the first mounting part is mounted on a top cross beam of the door-shaped frame, a circular groove is formed in the second mounting part from top to bottom, a first through hole is formed in the center of the bottom of the groove, the diameter of the first through hole is smaller than that of the circular groove, a cylindrical sawing angle adjusting column with the diameter smaller than that of the groove and larger than that of the first through hole is placed in the circular groove, the sawing angle adjusting column can rotate and be positioned in the groove, a second through hole is longitudinally formed in the sawing angle adjusting column, the second through hole is coaxial with the sawing angle adjusting column, the diameter of the second through hole is smaller than that of the first through hole, a longitudinal groove or a longitudinal convex strip is formed in the hole wall where the second through hole is located, a circle of scale mark is arranged on the annular top surface of the sawing angle adjusting column, and a pointer pointing to the scale mark is arranged on the top surface of the second mounting part;

the steel saw adjusting support comprises a longitudinal guide rail, a transverse sleeve and two anti-skew bearing support columns, wherein the transverse sleeve is sleeved on a saw beam of the steel saw and used for the saw beam to slide along the transverse sleeve, a first lug is arranged at the upper side part of the transverse sleeve, a second lug is arranged at the lower side part of the transverse sleeve, the first lug is rotatably connected with the lower end of the longitudinal guide rail through a rotating shaft, the first lug can be positioned relative to the longitudinal guide rail, the rotating shaft is horizontal and perpendicular to the transverse sleeve, the upper ends of the two anti-skew bearing support columns are connected to the second lug, the distance between the lower ends of the two anti-skew bearing support columns is less than 12cm, the lower end of each anti-skew bearing support column is forked to form two support rods, bearings are respectively arranged at the ends of the two support rods, the axes of the bearings are parallel to the anti-skew bearing support columns, a saw blade of the steel saw is positioned between the two bearings of each anti-skew bearing support column, and the bearings are positioned above sawteeth;

the longitudinal guide rail is longitudinally provided with a longitudinal raised line or a longitudinal groove matched with the longitudinal groove or the longitudinal raised line on the sawing angle adjusting column, the longitudinal guide rail penetrates through the first through hole and the second through hole, the longitudinal raised line or the longitudinal groove on the longitudinal guide rail is embedded with the longitudinal groove or the longitudinal raised line on the sawing angle adjusting column, and the longitudinal guide rail can longitudinally move relative to the sawing angle adjusting column.

2. The efficient manual sawing device according to claim 1 wherein the first mounting portion is a slide tube sleeved on the top beam of the portal frame, the slide tube is provided with a screw hole penetrating through the wall of the slide tube, and the slide tube is fastened to the top beam by a bolt.

3. The efficient manual sawing device according to claim 2 wherein the second mounting portion is provided with a screw hole penetrating through a wall of the recess, a bolt is disposed in the screw hole, and the sawing angle adjusting post is fixedly positioned in the recess by the bolt.

4. The efficient manual sawing device according to claim 3 wherein a third through hole and a fourth through hole are respectively formed at the lower end of the longitudinal rail and the first projection, the rotation shaft is a bolt, and the first projection is sequentially inserted through the third through hole and the fourth through hole by the bolt and is fixedly positioned on the longitudinal rail by a nut.

5. The efficient manual sawing device according to claim 4 wherein said longitudinal ribs are located on the sawing angle adjustment post and said longitudinal grooves are located on the longitudinal rail, the upper end of the longitudinal grooves being closed and the lower end being open to the lower end surface of the longitudinal rail.

6. The efficient manual sawing device according to claim 5 wherein a transverse through hole is formed in the second projection, a fifth through hole is formed in an upper end of the anti-skew bearing post, and the second projection and the anti-skew bearing post are connected by inserting a bolt into the transverse through hole and the fifth through hole and fastening with a nut.

7. The efficient manual sawing device according to claim 6 wherein the two bearing peripheral surfaces of each anti-skew bearing support are in contact with the two side surfaces of the hacksaw blade, respectively.

Technical Field

The invention belongs to the technical field of mechanical manufacturing and processing, and particularly relates to a high-efficiency manual sawing device.

Background

In the machine manufacturing and machining manufacturing process, the sawing of the workpiece is a very necessary process, the workpiece has various sizes, the first step of the machining is blanking, and the sawing is the most common blanking method. The common sawing mode comprises machine sawing, machine cutting and manual sawing, the manual sawing tool is simple, the requirements on fields and processing environments are low, and the daily use is wide.

The common tool for manual sawing at present is a saw bow matched with a steel saw blade, and the following four problems mainly exist in use.

During operation, the machining efficiency is influenced by the force applied by one hand: when sawing, an operator respectively holds the saw bow handle and the saw bow head by two hands in tandem, the saw bow is placed above a workpiece, wherein the arms on the side of the handle push forwards to finish sawing work on the workpiece, and the arm holding the saw bow head is responsible for controlling the sawing direction to prevent sawing deviation. The sawing process needs an operator to apply certain force to cut the workpiece by the saw blade, and the operator can only apply force through one side of the handle of the saw bow, so that the long-time operation is easy to fatigue and the operation efficiency is influenced.

The saw blade is easy to break in the sawing process: the sawing operation requires the operator to push the saw blades back and forth in tandem by two hands, the pushing process needs to be kept in the same linear direction, the saw blade is bent once the saw blades deviate from the original direction, the saw teeth are clamped on the edge of a workpiece after the saw blades are bent, and the saw blades can be immediately broken by a little force.

The sawed section is not vertical and the precision is low: the sawing operation is a cutting process of a workpiece from top to bottom, the problem that the section is not vertical easily occurs in the sawing process, and the section is not vertical mainly caused by the following two aspects: 1. when the saw is operated by two hands, fatigue is easily caused by manual reciprocating pushing, and the sawing direction is difficult to control in the whole manual operation process; 2. the saw blade has the structural characteristics of thin thickness, the saw blade is easy to deviate from a vertical state in the sawing process, and the sawing direction is also distorted due to the distortion of the saw blade.

The angle-free control function: in the actual operation process, the sawing angle of a workpiece needs to be adjusted frequently, for example, many workpieces are sawn at 45 degrees, the current method is to use a line drawing tool such as an angle square to draw lines on the workpiece, then use a saw bow to saw along the lines, and the sawing and the angle control need to be completed in two steps.

Disclosure of Invention

In order to solve the problems that the processing efficiency is influenced by the force of one hand during the operation, a saw blade is easy to break in the sawing process, the sawing section is not vertical, the precision is low, and the angle control function is not available, the invention provides the high-efficiency manual sawing device.

The invention relates to a high-efficiency manual sawing device, which comprises a hacksaw with a saw beam and a saw blade and a bracket group for supporting the hacksaw, wherein the bracket group comprises a portal frame which is used for being arranged on a workbench and is provided with two supporting legs and a top cross beam, a hacksaw adjusting bracket and a connecting piece for connecting the portal frame and the hacksaw adjusting bracket;

the connecting piece is formed by connecting a first mounting part and a second mounting part, the first mounting part is mounted on a top cross beam of the door-shaped frame, a circular groove is formed in the second mounting part from top to bottom, a first through hole is formed in the center of the bottom of the groove, the diameter of the first through hole is smaller than that of the circular groove, a cylindrical sawing angle adjusting column with the diameter smaller than that of the groove and larger than that of the first through hole is placed in the circular groove, the sawing angle adjusting column can rotate and be positioned in the groove, a second through hole is longitudinally formed in the sawing angle adjusting column, the second through hole is coaxial with the sawing angle adjusting column, the diameter of the second through hole is smaller than that of the first through hole, a longitudinal groove or a longitudinal convex strip is formed in the hole wall where the second through hole is located, a circle of scale mark is arranged on the annular top surface of the sawing angle adjusting column, and a pointer pointing to the scale mark is arranged on the top surface of the second mounting part;

the steel saw adjusting bracket comprises a longitudinal guide rail, a transverse sleeve and two anti-skew bearing supports, wherein the transverse sleeve is sleeved on a saw beam of the steel saw and used for the saw beam to slide along the transverse sleeve, a first lug is arranged at the upper side part of the transverse sleeve, a second lug is arranged at the lower side part of the transverse sleeve, the first lug is rotatably connected with the lower end of the longitudinal guide rail through a rotating shaft, the first lug can be positioned relative to the longitudinal guide rail, the rotating shaft is horizontal and vertical to the transverse sleeve, the upper ends of the two anti-skew bearing supports are connected to the second lug, the distance between the lower ends of the two anti-skew bearing supports is less than 12cm, the sawing of a workpiece with the width dimension of less than 10cm can be met, the lower end of each anti-skew bearing support is forked to form two support rods, bearings are respectively arranged at the ends of the two support rods, the axes of the bearings are parallel to the anti-skew bearing supports, and a saw blade of the steel saw is positioned between the two bearings of each anti-skew bearing support, the bearing is positioned above the sawtooth;

the longitudinal guide rail is longitudinally provided with a longitudinal raised line or a longitudinal groove matched with the longitudinal groove or the longitudinal raised line on the sawing angle adjusting column, the longitudinal guide rail penetrates through the first through hole and the second through hole, the longitudinal raised line or the longitudinal groove on the longitudinal guide rail is embedded with the longitudinal groove or the longitudinal raised line on the sawing angle adjusting column, and the longitudinal guide rail can longitudinally move relative to the sawing angle adjusting column.

In order to adjust the position of the manual saw conveniently, the first mounting portion is a sliding pipe sleeved on a top cross beam of the portal frame, a screw hole penetrating through the wall of the sliding pipe is formed in the sliding pipe, and the sliding pipe is fastened on the top cross beam through a bolt. Therefore, the sliding pipe can be slid to the proper position of the top cross beam and fixed according to the requirement, so that the manual saw is positioned at the optimal position, and the sawing operation is more convenient.

In order to adjust the sawing angle conveniently, a screw hole penetrating through the wall of the groove is formed in the second mounting portion, a bolt is arranged in the screw hole, and the sawing angle adjusting column is fixedly arranged in the groove through the bolt. Therefore, the angle of the sawing angle adjusting column can be adjusted by loosening the bolt, and the sawing angle can be positioned by fastening the bolt after adjustment.

In order to adjust the sawing angle conveniently, a third through hole and a fourth through hole are formed in the lower end of the longitudinal guide rail and the first protruding block respectively, the rotating shaft is a bolt, and the first protruding block penetrates through the third through hole and the fourth through hole in sequence through the bolt and is fixedly located on the longitudinal guide rail through nuts. Therefore, the nut is unscrewed, the included angle between the longitudinal guide rail and the transverse sleeve can be adjusted, and the saw angle can be fixed by screwing the nut after adjustment.

In order that the longitudinal guide rail does not fall out of the sawing angle adjusting column from below after sawing is finished, the longitudinal raised line is positioned on the sawing angle adjusting column, the longitudinal groove is positioned on the longitudinal guide rail, the upper end of the longitudinal groove is closed, and the lower end of the longitudinal groove is opened on the lower end surface of the longitudinal guide rail.

In order to ensure that the saw blade keeps a vertical state when the saw blade saws a workpiece, a transverse strip-shaped through hole is formed in the second lug, a fifth through hole is formed in the upper end of the askew-proof bearing support, the transverse strip-shaped through hole and the fifth through hole are inserted through bolts, and the second lug and the askew-proof bearing support are connected through nut fastening. Therefore, the anti-skew bearing support can be fixed at the required position of the transverse strip-shaped through hole as required, so that the position of the anti-skew bearing is adjusted, the saw blade is ensured to be in a vertical state, and high-precision sawing is realized.

In order to improve the linearity of the saw blade in the sawing process, the outer peripheral surfaces of two bearings of each anti-tilting bearing support are respectively contacted with two side surfaces of the steel saw blade.

Has the advantages that: the manual sawing device of the invention can realize double-hand pushing by arranging the bracket group, saves labor and improves efficiency, by limiting the saw beam in the transverse sleeve to reciprocate, deviation in the sawing direction is prevented, teeth are prevented from being clamped on the saw blade, the saw blade cannot be broken, time and material cost are saved, and by arranging the anti-skew bearing support and the anti-skew bearing, the workpiece to be sawed can be fixed between the two anti-skew bearing supports, the saw blade is fixed in the middle of the bearing in the process of sawing the workpiece, thereby ensuring the smooth reciprocating motion of the saw blade, ensuring that the saw blade is not skewed and always kept in a vertical state, preventing the saw blade from being broken, realizing the vertical sawing section, improving the precision, and by arranging the sawing angle adjusting column and the scale mark, the sawing angle can be adjusted, and the sawing angle can be adjusted by adjusting the included angle between the longitudinal guide rail and the transverse sleeve; the first mounting part is a sliding pipe sleeved on the top cross beam of the portal frame, the sliding pipe is provided with a screw hole penetrating through the wall of the sliding pipe, and the sliding pipe is fastened on the top cross beam through a bolt, so that the position of the manual saw is conveniently adjusted; the second mounting part is provided with a screw hole penetrating through the wall of the groove, a bolt is arranged in the screw hole, and the sawing angle adjusting column is fixedly positioned in the groove through the bolt, so that the sawing angle can be conveniently adjusted; the lower end of the longitudinal guide rail and the first lug are respectively provided with a third through hole and a fourth through hole, the rotating shaft is a bolt, and the first lug sequentially penetrates through the third through hole and the fourth through hole through the bolt and is fixedly positioned on the longitudinal guide rail by using a nut, so that the sawing angle can be conveniently adjusted; the longitudinal raised strips are positioned on the sawing angle adjusting column, the longitudinal grooves are positioned on the longitudinal guide rails, the upper ends of the longitudinal grooves are closed, the lower ends of the longitudinal grooves are opened on the lower end faces of the longitudinal guide rails, and after sawing is finished, the longitudinal guide rails cannot fall off the sawing angle adjusting column from the lower side; the second lug is provided with a transverse strip-shaped through hole, the upper end of the anti-skew bearing support is provided with a fifth through hole, the second lug is connected with the anti-skew bearing support through bolts inserted into the transverse strip-shaped through hole and the fifth through hole and nuts fastened, and therefore the saw blade is guaranteed to be in a vertical state when the saw blade saws a workpiece; the outer peripheral surfaces of the two bearings of each anti-tilting bearing support are respectively contacted with the two side surfaces of the steel saw blade, so that the straightness of the saw blade in the sawing process is improved.

Drawings

FIG. 1 is a schematic view of a hand saw apparatus according to the present invention;

FIG. 2 is a schematic structural view of a hacksaw adjusting bracket of the manual sawing device according to the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 taken along line A-A;

FIG. 4 is a schematic view of the structure of FIG. 2 taken along line B-B;

FIG. 5 is a schematic view of the structure of the connector of the manual sawing device according to the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5 taken along line C-C;

FIG. 7 is a schematic structural view of the hand saw device of the present invention in an operating state;

in the figure, 1, a door-shaped frame; 11. a top cross beam; 2. a hacksaw; 21. sawing the beam; 22. a saw blade; 3. a connecting member; 31. a first mounting portion; 32. a second mounting portion; 4. a transverse cannula; 41. a first bump; 42. a second bump; 5. a longitudinal guide rail; 6. a skew-preventing bearing support; 61. a bearing; 7. sawing the angle adjusting column; l, a workbench; m, working and clamping bench vice; and N, workpieces.

Detailed Description

The technical solution of the present invention is described in detail by the following examples, but the scope of the present invention is not limited to the examples.

Examples

As shown in fig. 1 to 7, a high-efficiency manual sawing device includes a hacksaw 2 having a saw beam 21 and a saw blade 22, and a holder set for supporting the hacksaw 2, the holder set including a steel gantry 1 having two legs and a top cross member 11 for being mounted on a table L, a hacksaw adjusting holder, and a connecting member 3 for connecting the gantry 1 and the hacksaw adjusting holder.

A gasket is welded at the bottom ends of two support legs of the door-shaped frame 1, and four through holes are formed in the gasket and used for screws to fasten the support legs on a working table.

The connecting piece 3 is formed by connecting a first mounting part 31 and a second mounting part 32, the first mounting part 31 is a slide pipe sleeved on the top cross beam 11 of the door-shaped frame 1, a screw hole penetrating through the wall of the slide pipe is formed in the slide pipe, and the slide pipe is fastened on the top cross beam 11 through a bolt. A circular groove is formed in the second mounting portion 32 from top to bottom, a first through hole is formed in the center of the bottom of the groove, the diameter of the first through hole is smaller than that of the circular groove, a cylindrical sawing angle adjusting column 7 with the diameter smaller than that of the groove and larger than that of the first through hole is placed in the circular groove, a second through hole is longitudinally formed in the sawing angle adjusting column 7 and coaxial with the sawing angle adjusting column 7, the diameter of the second through hole is smaller than that of the first through hole, and four longitudinal convex strips are arranged on the hole wall where the second through hole is located. The second mounting portion 32 is provided with a screw hole penetrating through the wall of the groove, and a bolt is arranged in the screw hole, so that the sawing angle adjusting column 7 is fixed in the groove when the bolt is fastened, and the sawing angle adjusting column 7 can rotate in the groove when the bolt is unscrewed. A circle of scale marks is provided on the annular top surface of the sawing angle adjusting post 7, and a pointer pointing to the scale marks is provided on the top surface of the second mounting portion 32.

The hacksaw adjusting bracket comprises a longitudinal guide rail 5, a transverse sleeve 4 and two anti-tilting bearing supports 6. The transverse sleeve 4 is sleeved on the saw beam 21 of the steel saw 2 to enable the saw beam 21 to slide along the transverse sleeve 4, the size of a tube cavity of the transverse sleeve 4 is matched with that of the saw beam 21, the upper side portion of the transverse sleeve 4 is provided with a first protruding block 41, the lower side portion of the transverse sleeve 4 is provided with a second protruding block 42, the lower end of the longitudinal guide rail 5 is in a thin plate shape, the lower end of the longitudinal guide rail 5 and the first protruding block 41 are respectively provided with a third through hole and a fourth through hole, a bolt sequentially penetrates through the third through hole and the fourth through hole and is fastened through a nut by the first protruding block 41, the first protruding block 41 is positioned on the longitudinal guide rail 5, when the nut is unscrewed, the first protruding block 41 can rotate relative to the longitudinal guide rail 5, the bolt is a rotating shaft, and the rotating shaft is horizontal and is perpendicular to the transverse sleeve 4. The second projection 42 is provided with a horizontal through-hole in a bar shape, the upper end of the support 6 for the anti-skew bearing is in a thin plate shape, and a fifth through-hole is provided, and the second projection 42 and the support 6 for the anti-skew bearing are connected by inserting a bolt into the horizontal through-hole in a bar shape and the fifth through-hole and fastening them with a nut. The distance between the lower ends of the two anti-skew bearing support columns 6 is 12cm, the requirement for sawing a workpiece with the width dimension within 10cm can be met, the lower end of each anti-skew bearing support column 6 is forked to form two support rods, the ends of the two support rods are respectively provided with one bearing 61, the number of the anti-skew bearings 61 on the two anti-skew bearing support columns 6 is four, the axes of the bearings 61 are parallel to the anti-skew bearing support columns 6, the saw blades 22 are clamped by the two bearings 61 of each anti-skew bearing support column 6, namely, the outer peripheral surfaces of the two bearings 61 are respectively contacted with two side surfaces of the saw blades 22, and the bearings 61 are positioned above the saw teeth.

The longitudinal guide rail 5 is provided with a longitudinal groove matched with the longitudinal convex strip on the sawing angle adjusting column 7, the upper end of the longitudinal groove is closed, the lower end of the longitudinal groove is opened on the lower end face of the longitudinal guide rail 5, the longitudinal guide rail 5 penetrates through the first through hole and the second through hole, the longitudinal groove on the longitudinal guide rail 5 is embedded with the longitudinal convex strip on the sawing angle adjusting column 7, and the longitudinal guide rail 5 can move longitudinally relative to the sawing angle adjusting column 7.

Of course, in other embodiments, the hole wall where the second through hole is located may also be provided with a longitudinal groove, at this time, two ends of the longitudinal groove are opened at the upper and lower end surfaces of the sawing angle adjusting column, and then the longitudinal guide rail is provided with a longitudinal protruding strip matched with the longitudinal groove on the sawing angle adjusting column.

In actual use, the sliding pipe of the connecting piece 3 is sleeved on the top cross beam 11 of the door-shaped frame 1, a proper position is selected to be fastened by a bolt, and then the supporting legs of the door-shaped frame 1 are fixed on a working table by screws, so that the clamping directions of the top cross beam 11 of the door-shaped frame 1 and a workpiece N are 45-degree crossed, and the adjustment of the sawing angle is not influenced. And then, the upper ends of the two anti-distortion bearing support columns 6 are fastened with the second lug 42 at the lower side part of the transverse sleeve 4 by bolts and nuts, when the distance between the two anti-distortion bearing support columns 6 needs to be adjusted, the nuts are loosened, and the two anti-distortion bearing support columns 6 are fastened after moving to proper positions along the transverse strip-shaped through holes on the second lug 42. The saw blade 22 is then assembled into a complete hand saw. At this moment, the saw blade 22 is just arranged between the two bearings 61, the bearings 61 are positioned above the sawteeth of the saw blade 22, then the longitudinal guide rail 5 is inserted from the first through hole and the second through hole from top to bottom, and the longitudinal convex strip on the hole wall where the second through hole is positioned is embedded with the longitudinal groove on the longitudinal guide rail 5, so that when the horizontal rotation angle needs to be adjusted, only the longitudinal guide rail 5 needs to be rotated to drive the sawing angle adjusting column 7 to a proper angle according to the scale marks, or the manual saw can be rotated to drive the sawing angle adjusting column 7 to a proper angle position at the back, and then the sawing angle adjusting column 7 is fastened through the bolts. And then, the lower end of the longitudinal guide rail 5 and the first lug 41 on the upper side part of the transverse sleeve 4 are fastened through a bolt and a nut, and when the sawing angle needs to be adjusted, the nut is loosened, so that the transverse sleeve 4 rotates around the bolt by a specific angle and then is fastened. The top end of the longitudinal guide rail 5 is not provided with a longitudinal groove (namely the upper end of the longitudinal groove is closed), so that after the sawing is finished, the longitudinal guide rail 5 is still embedded on the sawing angle adjusting column 7 and supported by the sawing angle adjusting column 7, the sawing angle adjusting column 7 cannot be separated from the lower part, and when the operation is carried out again, the sawing operation can be carried out again only by operating the steel saw to move upwards to the sawing starting height.

In the sawing process, the work clamping bench clamp M is used for fixing the workpiece N, then an operator can hold the saw handle with two hands to push and pull in a reciprocating mode to enable the saw beam 21 to be limited to move in the transverse sleeve 4, the workpiece N is sawn between the two anti-tilting bearing supports 6, when the sawing depth is increased, the saw blade 22 and the steel saw automatically sink by means of weight, and the longitudinal guide rail 5 is driven to move downwards along the second through hole of the sawing angle adjusting post 7 until the sawing work is completed.

The above-mentioned techniques not specifically mentioned refer to the prior art.

As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.