Cold cutting saw

Abstract

The invention provides a cold cutting saw. The cold cutting saw comprises a handle, a shell, a saw blade protective cover, a driving device and a transmission mechanism. The shell is arranged at the front end of the handle; the shell comprises a driving part and a transmission part; the driving part and the transmission part are integrally formed into a whole; the saw blade shield is mounted at the lower end of the transmission part; the saw blade shield is used for accommodating a saw blade; the driving device is arranged in the driving part; the transmission mechanism is arranged in the transmission part; the transmission mechanism is driven by the driving device; the transmission mechanism is used for driving the saw blade to rotate; the driving part and the transmission part are integrally formed into the shell; the strength of the whole workpiece is increased, and the defects of the existing product are eliminated; and the service life of the machine can be prolonged.

Description

[0001] The present invention relates to the technical field of power tools, and particularly relates to a cold cut-off saw. Background Art

[0002] Cold cut-off machines, also known as cold cut-off saws and steel bar cutters, are used in building construction to meet the requirements for building structure safety and quality. A large amount of steel bar materials are used in the foundation and walls. Steel bars are used as skeletons and poured with concrete simultaneously to improve the load-bearing and seismic performance of buildings. Generally, a large desktop steel bar cutter is used to cut steel bars into fixed lengths for use. However, for steel bars fixed on the wall or at the construction site, the large desktop cutter cannot be used, and manual hacksaws are inefficient and laborious. Therefore, an electric steel bar cutter has emerged on the market, which is convenient to carry and hold for cutting steel bars.

[0003] The existing cold cut-off saw includes a reduction gearbox and a handle. The reduction gearbox and the handle are connected by bolts. A motor is installed inside the handle. When the motor operates, a large amount of heat is generated, causing the handle to deform. After deformation, the handle and the reduction gearbox are misaligned, resulting in a decrease in the concentricity of the rotor and the stator. Subsequently, the rotor will rub against the stator, leading to motor wear and ablation. At the same time, the plastic handle also affects the heat dissipation of the motor. Summary of the Invention

[0004] The purpose of the present invention is to provide a cold cut-off saw. By setting the driving part and the transmission part to be integrally formed into a housing, the strength of the overall workpiece is increased. In the existing cold cut-off saw, the reduction gearbox and the handle are connected by bolts. A motor is installed inside the handle. When the motor operates, a large amount of heat is generated, causing the handle to deform. After deformation, the handle and the reduction gearbox are misaligned, resulting in a decrease in the concentricity of the rotor and the stator. Subsequently, the rotor will rub against the stator, leading to motor wear and ablation. In this solution, the driving part and the transmission part housing are integrated, eliminating any shortcomings of the existing products and increasing the service life of the machine.

[0005] The present application provides a cold cut-off saw, including: A handle; A housing, arranged at the front end of the handle; the housing includes a driving part and a transmission part; the driving part and the transmission part are integrally formed into a whole; A saw blade guard; installed at the lower end of the transmission part; the saw blade guard is used to accommodate the saw blade; A driving device; arranged inside the driving part; and A transmission mechanism; arranged inside the transmission part; the transmission mechanism is driven by the driving device; the transmission mechanism is used to drive the saw blade to rotate.

[0006] Preferably, the saw blade is arranged at the end of the transmission mechanism; the saw blade is driven by the transmission mechanism; an opening is provided at the front end of the saw blade guard, and the saw blade leaks out from the opening.

[0007] Preferably, a horizontal receiving cavity a is provided in the driving part; a vertical receiving cavity b is provided in the transmission part; the receiving cavity a is perpendicular to the receiving cavity b; the driving device is arranged in the receiving cavity a; and the transmission mechanism is arranged in the receiving cavity b.

[0008] Preferably, the driving part is cylindrical; a plurality of anti-slip grooves are provided on the outer circumference of the driving part.

[0009] Preferably, the driving device is installed in the driving part through a support frame.

[0010] Preferably, a plurality of positioning ribs are provided in the driving part; the positioning ribs are clamped in cooperation with the positioning grooves on the support frame.

[0011] Preferably, a rear cover is threadedly connected to the rear part of the driving part; the rear cover is used to support the output shaft of the driving device.

[0012] Preferably, a partition is provided in the transmission part; a transmission hole is provided on the partition; a gear shaft hole and an output shaft position are provided in front of the transmission hole; An output shaft is provided in the driving device; an output gear is installed at the front end of the output shaft; the output gear drives the transmission mechanism; The transmission mechanism includes a gear shaft; a bevel gear is provided on the gear shaft; the bevel gear meshes with the output gear; the gear on the gear shaft meshes with a transmission gear; the transmission gear is installed on the main shaft; the lower end of the main shaft passes through the saw blade guard and is connected to the saw blade; the output gear is located in the transmission hole; the gear shaft passes through the gear shaft hole; and the upper end of the main shaft is rotatably installed in the output shaft position.

[0013] Preferably, an upper cover is threadedly engaged with the upper end of the transmission part; a positioning hole is provided in the upper cover; and the upper end of the gear shaft of the transmission mechanism is rotatably installed in the positioning hole.

[0014] Preferably, a heat insulation pad is provided between the transmission part and the saw blade guard.

[0015] Preferably, a baffle is provided on the heat insulation pad.

[0016] Preferably, a fan blade is installed at the front end of the output shaft; and an air outlet a is provided on the side of the driving part.

[0017] Preferably, the saw blade guard includes a protective cover and a bottom plate; the protective cover is installed at the lower end of the transmission part; the bottom plate is installed at the lower end of the protective cover; an air outlet b is provided on the protective cover; and the air outlet b cooperates with the air outlet a to discharge air.

[0018] Due to the adoption of the above technical solution in the present invention, the present invention has the following advantages: 1. In the present invention, the driving part and the transmission part are integrally formed into a housing; the strength of the overall workpiece is increased; in the existing deceleration box body and the handle, the two parts are connected by bolts; when the motor operates, a large amount of heat will be generated, resulting in the deformation of the plastic handle. After deformation, the handle and the deceleration box will be misaligned, resulting in a decrease in the concentricity between the rotor and the stator. Subsequently, the rotor will rub against the stator, resulting in wear and ablation of the motor; in this solution, the housing is set as a whole and usually made of cast aluminum material, which increases the structural strength, has excellent heat dissipation performance, and eliminates the shortcomings of existing products; it can increase the service life of the machine and enhance the heat dissipation function.

[0019] 2. In the present invention, by providing a plurality of anti-slip grooves on the outer circumference of the driving part, the friction force between the hand and the driving part can be increased; the holding can be more firm.

[0020] 3. In the present invention, by providing that the rear cover is threadedly connected to the rear part of the driving part, the rear cover supports the driving output shaft of the driving device; the threaded connection has high strength, is easy to disassemble, and has high positioning concentricity.

[0021] 4. In the present invention, by placing the saw blade between the locking block and the cushion block; the saw blade can be effectively positioned.

[0022] 5. In the present invention, by providing a heat insulation pad between the transmission part and the saw blade guard, the heat generated during saw blade cutting and the heat on the saw blade guard can be effectively prevented from being transmitted to the transmission part, and then transmitted to the driving part through the transmission part; thus, the temperature of the hand holding the driving part can be prevented from being too high.

[0023] 6. In the present invention, by providing an air outlet b on the protective cover; the air outlet b cooperates with the air outlet a to discharge air; the saw blade guard and the saw blade inside the saw blade guard can be cooled; the saw blade guard and the saw blade can be prevented from being overheated, resulting in saw blade ablation and wear. At the same time, the high-speed air flow can blow away the high-temperature residual iron filings inside the saw blade disc, avoiding the problem of heat generation caused by the accumulation of high-temperature residual iron filings.

[0024] 7. In the present invention, by providing a screen on the air outlet b, the debris generated during saw blade cutting can be prevented from entering the housing through the air outlet b and the air outlet a, causing damage to the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a cold cutting saw according to the present invention.

[0026] Figure 2 It is an exploded structure diagram of a cold cutting saw according to the present invention.

[0027] Figure 3 It is a schematic diagram of the controller according to the present invention.

[0028] Figure 4 This is a schematic structural diagram of the saw blade guard of the present invention.

[0029] Figure 5 This is an exploded structural diagram of the driving device of the present invention.

[0030] Figure 6 This is an exploded structural diagram of the transmission mechanism of the present invention.

[0031] Figures 7 - 9 This is a schematic structural diagram of the housing of the present invention.

[0032] Figure 10 This is a schematic structural diagram of the heat insulation pad of the present invention.

[0033] Figure 11 This is a schematic structural diagram of the air outlet b of the present invention.

[0034] Reference numerals in the attached drawings: 10 - handle; 20 - housing; 30 - saw blade guard; 40 - saw blade; 50 - driving device; 60 - transmission mechanism; 70 - heat insulation pad; 80 - upper cover; 11 - controller; 12 - button; 21 - driving part; 22 - transmission part; 211 - accommodation cavity a; 212 - anti-slip groove; 213 - air outlet a; 214 - positioning rib; 221 - accommodation cavity b; 222 - partition; 2221 - transmission hole; 2222 - gear shaft hole; 2223 - output shaft position; 31 - protective cover; 32 - bottom plate; 311 - air outlet b; 312 - screen; 313 - chip outlet; 51 - driving output shaft; 52 - output gear; 53 - fan blade; 54 - support frame; 55 - rear cover; 541 - positioning groove; 61 - bevel gear; 62 - gear shaft; 63 - main shaft; 64 - transmission gear; 65 - locking block; 631 - cushion block; 71 - baffle; 81 - mounting hole; 82 - conduit; 83 - guide post. Detailed implementation manners

[0035] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention 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 connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manner.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] Referring to Figures 1 - 11 , in order to solve the problem that the existing speed reduction box body and the handle are connected by bolts; the vibration generated during the movement of the speed reduction mechanism in the speed reduction box body will damage the connection between the speed reduction box body and the handle; the present invention provides a cold cutting saw, comprising: A handle 10; specifically, the handle 10 is a plastic housing; a controller 11 is installed inside the handle 10; a button 12 is provided on the handle 10; the button 12 is electrically connected to the controller 11; air inlets are respectively opened on both sides of the handle 10; the air inlets are located on both sides of the controller 11; large screens are installed on the air inlets; by installing large screens on the air inlets, large particles can be prevented from entering the handle 10 when air enters; damage to the handle 10 can be caused.

[0039] A housing 20, arranged at the front end of the handle 10; the housing 20 includes a driving part 21 and a transmission part 22; the driving part 21 and the transmission part 22 are integrally formed into the housing 20; by setting the driving part 21 and the transmission part 22 to be integrally formed into the housing 20; the strength of the overall workpiece is increased; in the existing technology, the speed reduction box body and the handle are connected by bolts; the vibration generated during the movement of the speed reduction mechanism in the speed reduction box body will damage the connection between the speed reduction box body and the handle; in this solution, the housing 20 is set as a whole, so that the strength of the overall workpiece is increased; preferably, the housing 20 is made of aluminum alloy material, and by using the casting method, the manufacturing process is simple, the cost is low, and the heat dissipation performance is excellent. The service life of the machine can be increased.

[0040] A saw blade guard 30; detachably installed at the lower end of the transmission part 22; the saw blade guard 30 is used to accommodate the saw blade 40; an opening is provided on the saw blade guard 30, and the saw blade 40 leaks out from the opening; the saw blade 40 exposes from the opening and can contact the workpiece to be processed for cutting operations; A driving device 50; arranged inside the driving part 21; preferably, the driving device 50 is a brushless motor; the brushless motor is electrically connected to the controller 11; the start and stop movements of the brushless motor are controlled by the controller 11.

[0041] The transmission mechanism 60 is arranged inside the transmission part 22. The transmission mechanism 60 is driven by the driving device 50 and is used to drive the saw blade 40 to rotate. Specifically, the saw blade 40 is arranged at the end of the transmission mechanism 60 and is driven by the transmission mechanism 60. By arranging the driving part 21 and the transmission part 22 to be integrally formed into the housing 20, the strength of the overall workpiece is increased. In the existing product, the reduction gearbox body and the handle are connected by bolts. During the movement of the reduction mechanism inside the reduction gearbox body, vibrations will occur and damage the connection between the reduction gearbox body and the handle. In this solution, the housing 20 is set as a whole, eliminating the disadvantages of the existing products and increasing the service life of the machine.

[0042] In another implementation manner of this embodiment, a horizontal accommodation cavity a211 is arranged inside the driving part 21, and a vertical accommodation cavity b221 is arranged inside the transmission part 22. The accommodation cavity a211 is perpendicular to the accommodation cavity b221. The driving device 50 is arranged inside the accommodation cavity a211, and the transmission mechanism 60 is arranged inside the accommodation cavity b221.

[0043] In another implementation manner of this embodiment, the driving part 21 is cylindrical, and a plurality of anti-slip grooves 212 are arranged on the outer circumference of the driving part 21. The driving part 21 can be held by hand during use. By arranging a plurality of anti-slip grooves 212 on the outer circumference of the driving part 21, the friction between the hand and the driving part 21 can be increased, and it can be held more firmly.

[0044] In another implementation manner of this embodiment, the driving device 50 is installed inside the driving part 21 through the support frame 54. Specifically, a plurality of positioning ribs 214 are arranged inside the driving part 21, and the positioning ribs 214 are clamped in cooperation with the positioning grooves 541 on the support frame 54. The support frame 54 is cylindrical, and heat dissipation holes are arranged between adjacent two positioning grooves 541. By arranging heat dissipation holes between adjacent two positioning grooves 541, the driving device 50 therein can be dissipated heat.

[0045] In another implementation manner of this embodiment, a rear cover 55 is threadedly connected to the rear part of the driving part 21, and the rear cover 55 is used to support the output shaft 51 of the driving device 50. Specifically, internal threads are arranged inside the rear part of the driving part 21, external threads are arranged on the rear cover 55, and the rear cover 55 is threadedly connected to the rear part of the driving part 21. By arranging the rear cover 55 to be threadedly connected to the rear part of the driving part 21, the output shaft 51 of the driving device 50 can be supported.

[0046] In another implementation manner of this embodiment, a partition 222 is arranged inside the transmission part 22, and a transmission hole 2221 is arranged on the partition 222. A gear shaft hole 2222 and an output shaft position 2223 are arranged in front of the transmission hole 2221.

[0047] In another implementation manner of this embodiment, an output shaft 51 is provided in the driving device 50; an output gear 52 is installed at the front end of the output shaft 51; the output gear 52 drives the transmission mechanism 60. Specifically, the driving device 51 can be a brushless motor.

[0048] In another implementation manner of this embodiment, the transmission mechanism 60 includes a gear shaft 62; a bevel gear 61 is provided on the gear shaft 62; the bevel gear 61 meshes with the output gear 52; the gear on the gear shaft 62 meshes with the transmission gear 64; the transmission gear 64 is installed on the main shaft 63; the lower end of the main shaft 63 passes through the saw blade guard 30 and is connected with a saw blade 40. Specifically, the lower end of the gear shaft 62 is rotatably installed in the gear shaft hole on the protective cover 31.

[0049] In another implementation manner of this embodiment, the output gear 52 is located in the transmission hole 2221; the gear shaft 62 passes through the gear shaft hole 2222; the upper end of the main shaft 63 is rotatably installed in the output shaft position 2223. The output shaft position 2223 can be a through hole or a blind hole; specifically, the bevel gear 61 and the output gear 52 are located above the partition plate 222; the upper end of the transmission part 22 is threadedly matched with an upper cover 80; an area is formed in the accommodation cavity b221 between the upper cover 80 and the upper side of the partition plate 222; the bevel gear 61 and the output gear 52 are located in this area; by arranging the bevel gear 61 and the output gear 52 in this area and placing lubricant in this area, the bevel gear 61 and the output gear 52 can be effectively lubricated.

[0050] In another implementation manner of this embodiment, a cushion block 631 is provided at the lower end of the main shaft 63; a locking block 65 is threadedly matched with the lower end of the cushion block 631; the saw blade 40 is located between the locking block 65 and the cushion block 631. By placing the saw blade 40 between the locking block 65 and the cushion block 631, the saw blade 40 can be effectively positioned.

[0051] In another implementation manner of this embodiment, the upper end of the transmission part 22 is threadedly matched with an upper cover 80; a positioning hole is provided in the upper cover 80; the upper end of the gear shaft 62 of the transmission mechanism 60 is rotatably installed in the positioning hole. By arranging the upper end of the gear shaft 62 of the transmission mechanism 60 to be rotatably installed in the positioning hole, the gear shaft 62 can be effectively positioned and supported.

[0052] In another implementation manner of this embodiment, an installation hole 81 is provided on the upper cover 80; a conduit 82 is installed in the installation hole 81; a guide post 83 is slidably installed in the conduit 82; a spring is sleeved on the guide post 83. Specifically, a compression spring is sleeved on the guide post 83; a stop hole is provided on the bevel gear 61; by pressing the guide post 83, when the guide post 83 is located in the stop hole on the bevel gear 61, the bevel gear 61 is stopped; thereby the transmission mechanism 60 is stopped; the main shaft 63 at the end of the transmission mechanism 60 stops rotating, so that the locking block 65 can be tightened or loosened.

[0053] In another implementation manner of this embodiment, the saw blade guard 30 includes a protective cover 31 and a bottom plate 32; the protective cover 31 is installed at the lower end of the transmission part 22; the bottom plate 32 is installed at the lower end of the protective cover 31; the saw blade 40 is located between the protective cover 31 and the bottom plate 32. By having the saw blade 40 located between the protective cover 31 and the bottom plate 32, the saw blade 40 can be effectively covered.

[0054] In another implementation manner of this embodiment, a heat insulation pad 70 is provided between the transmission part 22 and the saw blade guard 30. By arranging the heat insulation pad 70 between the transmission part 22 and the saw blade guard 30, the heat generated during the cutting of the saw blade 40 and the heat on the saw blade guard 30 can be effectively prevented from being transferred to the transmission part 22, and thus transferred to the driving part 21 through the transfer part 22; thereby preventing the temperature of the driving part 21 from being too high when the hand holds it.

[0055] In another implementation manner of this embodiment, a baffle 71 is provided on the heat insulation pad 70. Specifically, the baffle 71 covers the gears on the gear shaft 62 and the transmission gear 64; the baffle 71, the protective cover 31 and the lower side of the partition 222 form another area in the accommodation cavity b221; the gears on the gear shaft 62 and the transmission gear 64 are located in this area; by placing lubricant in this area, the gears on the gear shaft 62 and the transmission gear 64 can be effectively lubricated; at the same time, the amount of lubricant can be saved.

[0056] In another implementation manner of this embodiment, a fan blade 53 is installed at the front end of the output shaft 51; an air outlet a213 is provided at the front part of the driving part 21; the air outlet a213 is located below the blades of the fan blade 53. By installing the fan blade 53 at the front end of the output shaft 51 and having the air outlet a213 located below the blades of the fan blade 53, air can be exhausted at the front part.

[0057] In another implementation manner of this embodiment, the saw blade guard 30 includes a protective cover 31 and a bottom plate 32; the protective cover 31 is installed at the lower end of the transmission part 22; the bottom plate 32 is installed at the lower end of the protective cover 31; an air outlet b311 is provided on the protective cover 31; the air outlet b311 cooperates with the air outlet a213 for air outlet. By providing the air outlet b311 on the protective cover 31; the air outlet b311 cooperates with the air outlet a213 for air outlet; after the cold air blows into the saw blade guard 30, it can directly air-cool the saw blade in the saw blade guard 30; preventing the saw blade guard 30 and the saw blade from having too high a temperature and causing the saw blade to be ablated and worn; at the same time, the high-speed air flow can blow away the high-temperature residual iron filings in the saw blade guard 30, avoiding the problem of heat generation caused by the accumulation of high-temperature residual iron filings, and solving the problem that the temperature of the saw blade and the head shell is too high when the saw blade in the existing cold cutting saw head shell cuts.

[0058] In another implementation of this embodiment, a screen 312 is provided on the air outlet b311. By providing the screen 312 on the air outlet b311, it is possible to prevent debris generated during the cutting of the saw blade 40 from entering the housing 20 through the air outlet b311 and the air outlet a213, thereby damaging the device.

[0059] The present invention at least further includes the following advantages: In the present invention, the driving part 21 and the transmission part 22 are integrally formed into the housing 20; the strength of the overall workpiece is increased; in the prior art, the two parts of the reduction gearbox body and the handle are connected by bolts; during the movement of the reduction mechanism in the reduction gearbox body, vibrations will cause damage to the connection between the reduction gearbox body and the handle; in this solution, the housing 20 is set as a whole, so that the strength of the overall workpiece is increased; preferably, the housing 20 is made of aluminum alloy material, and by using the casting method, the manufacturing process is simple, the cost is low, and the heat dissipation performance is excellent. It can increase the service life of the machine.

[0060] A plurality of anti-slip grooves 212 are provided on the outer circumference of the driving part 21. The driving part 21 can be held by hand during use; by providing a plurality of anti-slip grooves 212 on the outer circumference of the driving part 21, the friction between the hand and the driving part 21 can be increased; and it can be held more firmly.

[0061] By setting the rear cover 55 to be threadedly connected to the rear part of the driving part 21, the output shaft 51 of the driving device 50 can be supported.

[0062] By positioning the saw blade 40 between the locking block 65 and the cushion block 631; the saw blade 40 can be effectively positioned. By providing the heat insulation pad 70 between the transmission part 22 and the saw blade guard 30, it is possible to effectively prevent the heat generated during the cutting of the saw blade 40 and the heat on the saw blade guard 30 from being transmitted to the transmission part 22, and then being transmitted to the driving part 21 through the transmission part 22; thus preventing the temperature of the driving part 21 from being too high when held by hand. By providing an air outlet b311 on the protective cover 31; the air outlet b311 cooperates with the air outlet a213 to discharge air; after the cold air blows into the saw blade guard 30, it can directly air-cool the saw blade in the saw blade guard 30; preventing the saw blade guard 30 and the saw blade from having too high a temperature, resulting in saw blade ablation and wear; at the same time, the high-speed air flow can blow away the high-temperature residual iron filings in the saw blade guard 30, avoiding the problem of heat generation caused by the accumulation of high-temperature residual iron filings, and solving the problem that the temperature of the saw blade and the head shell in the existing cold cutting saw head shell is too high when the saw blade cuts.

[0063] By providing a screen 312 on the air outlet b311, it is possible to prevent debris generated during the cutting of the saw blade 40 from entering the housing 20 through the air outlet b311 and the air outlet a213, thereby damaging the device.

[0064] In summary, it is easily understandable to those skilled in the art that, on the premise of no conflict, the above-mentioned advantageous means can be freely combined and superimposed.

[0065] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A cold saw, characterized in that, Comprising: A handle (10); A housing (20) disposed at the front end of the handle (10); the housing (20) includes a driving portion (21) and a transmission portion (22); the driving portion (21) and the transmission portion (22) are integrally formed as a whole; A saw blade guard (30); mounted at the lower end of the transmission portion (22); the saw blade guard (30) is used to accommodate a saw blade (40); A driving device (50); disposed within the driving portion (21); and A transmission mechanism (60); disposed within the transmission portion (22); the transmission mechanism (60) is driven by the driving device (50); the transmission mechanism (60) is used to drive the saw blade (40) to rotate.

2. The cold saw according to claim 1, wherein, The saw blade (40) is disposed at the end of the transmission mechanism (60); the saw blade (40) is driven by the transmission mechanism (60); an opening is provided at the front end of the saw blade guard (30), and the saw blade (40) leaks out from the opening.

3. The cold saw according to claim 1, characterized in that, A horizontal accommodation cavity a (211) is provided within the driving portion (21); a vertical accommodation cavity b (221) is provided within the transmission portion (22); the accommodation cavity a (211) is perpendicular to the accommodation cavity b (221); the driving device (50) is disposed within the accommodation cavity a (211); the transmission mechanism (60) is disposed within the accommodation cavity b (221).

4. The cold cut saw according to claim 1 or 3, characterized in that, The driving portion (21) is cylindrical; a plurality of anti-slip grooves (212) are provided on the outer circumference of the driving portion (21).

5. The cold cut-off saw according to claim 1, wherein, The driving device (50) is installed within the driving portion (21) through a support frame (54).

6. The cold cutting saw according to claim 5, wherein, A plurality of positioning ribs (214) are provided within the driving portion (21); the positioning ribs (214) cooperate with positioning grooves (541) on the support frame (54) to be tightly clamped.

7. The cold cut saw according to claim 1, characterized in that, A rear cover (55) is threadedly connected to the rear of the driving portion (21); the rear cover (55) is used to support the output shaft (51) of the driving device (50).

8. The cold saw according to claim 1, characterized in that, A partition (222) is provided within the transmission portion (22); a transmission hole (2221) is provided on the partition (222); a gear shaft hole (2222) and an output shaft position (2223) are provided in front of the transmission hole (2221); An output shaft (51) is provided within the driving device (50); an output gear (52) is installed at the front end of the output shaft (51); the output gear (52) drives the transmission mechanism (60); The transmission mechanism (60) includes a gear shaft (62); a bevel gear (61) is provided on the gear shaft (62); the bevel gear (61) meshes with the output gear (52); the gear on the gear shaft (62) meshes with a transmission gear (64); the transmission gear (64) is installed on a main shaft (63); the lower end of the main shaft (63) passes through the saw blade guard (30) and is connected to the saw blade (40); the output gear (52) is located within the transmission hole (2221); the gear shaft (62) passes through the gear shaft hole (2222); the upper end of the main shaft (63) is rotatably installed within the output shaft position (2223).

9. The cold saw according to claim 1, characterized in that, The upper end of the transmission part (22) is threadedly fitted with an upper cover (80); a positioning hole is provided inside the upper cover (80); the upper end of the gear shaft (62) of the transmission mechanism (60) is rotatably installed in the positioning hole.

10. The cold saw according to claim 1, characterized in that, A heat insulation pad (70) is provided between the transmission part (22) and the saw blade guard (30).

11. The cold saw according to claim 10, characterized in that, A baffle (71) is provided on the heat insulation pad (70).

12. The cold saw according to claim 8, characterized in that, A fan blade (53) is installed at the front end of the output shaft (51); an air outlet a (213) is provided on the side of the driving part (21).

13. The cold saw according to claim 12, characterized in that, The saw blade guard (30) includes a protective cover (31) and a bottom plate (32); the protective cover (31) is installed at the lower end of the transmission part (22); the bottom plate (32) is installed at the lower end of the protective cover (31); an air outlet b (311) is provided on the protective cover (31); the air outlet b (311) and the air outlet a (213) cooperate to discharge air.

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