Cutting device for highway engineering boards

Abstract

The invention relates to the technical field of cutting, in particular to a cutting device for highway engineering boards, which comprises a cutting motor, a cutting blade is fixedly mounted on an output shaft of the cutting motor, and a protective shell is fixedly mounted at one end, close to the output shaft, of the cutting motor. The protective shell is used for shielding material splashing generated by cutting, a handheld handle is arranged at the end, close to the circumferential side wall of the protective shell, of the cutting motor, a starting key is arranged on the handheld handle and used for starting the cutting motor to drive the cutting blade to rotate, a support is arranged on the outer wall of the protective shell, and the support is arranged in a U shape. According to the cutting machine, the problems that in the using process of the cutting machine, a cutting blade is prone to being abraded and blunt, the construction efficiency is affected, and people are prone to being hurt due to inertial rotation of the blade after cutting are solved.

Description

Technical Field

[0001] The present invention relates to the field of cutting technology, and more particularly to a cutting device for highway engineering plates. Background Art

[0002] During the construction of highway projects, stone slab cutting is an indispensable and frequently performed task. In order to meet the needs of flexibility and portability on the construction site, handheld highway engineering stone cutting machines came into being. Such cutting machines are usually handheld by operators, and through the powerful power of the cutting motor, the high-speed rotating cutting blade is driven to accurately cut the hard highway engineering stone. However, in actual application, such handheld stone cutting machines face several significant technical challenges:

[0003] First, the cutting blade will inevitably produce violent friction and impact with the stone during continuous cutting operations, causing it to gradually wear and become blunt. The hardness and density of stone are usually much higher than ordinary plates, so the pressure and wear on the cutting blade are also more serious. The sharpness of the cutting blade is directly related to the cutting efficiency and the quality of the cutting surface. Once the blade becomes blunt, it will not only cause a significant increase in cutting resistance and a sharp increase in energy consumption, but also seriously reduce construction efficiency, and may even fail to complete the precise cutting of the stone, affecting the progress and quality of subsequent projects.

[0004] Secondly, after the cutting is completed, the cutting blade will continue to rotate at high speed for a period of time due to inertia. During this process, if the operator fails to take timely measures to stop the blade from rotating, the sharp, still rotating blade can easily cause accidental damage to surrounding personnel or equipment. Especially in narrow or busy construction sites, this risk cannot be ignored.

[0005] In order to solve the above problems, a cutting device for highway engineering plates is proposed. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the problems existing in the prior art, the present invention provides a cutting device for highway engineering plates to solve the problems faced by the cutting machine mentioned in the background technology in that the cutting blade is easily worn and blunted during use, affecting the construction efficiency, and the inertial rotation of the blade after cutting is easy to injure people.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cutting device for highway engineering plates, comprising a cutting motor, a cutting blade is fixedly mounted on the output shaft of the cutting motor, and a protective shell is fixedly mounted on one end of the cutting motor close to the output shaft, the protective shell is used to shield the splash of materials generated by cutting, and a hand-held handle is provided at one end of the circumferential side wall of the cutting motor close to the protective shell, and a start button is provided on the hand-held handle, which is used to start the cutting motor to drive the cutting blade to rotate;

[0010] The outer wall of the protective shell is provided with a bracket, the bracket is U-shaped, and the two ends of the U-shaped opening of the bracket are welded to the outer wall of the protective shell, a movable plug-in deceleration grinding mechanism is provided inside the protective shell, and the deceleration grinding mechanism penetrates into the U-shaped groove of the bracket, and an extrusion spring is provided inside the bracket, and the extrusion spring is used to push the deceleration grinding mechanism to contact the cutting blade;

[0011] A driving mechanism is arranged on the hand-held handle, and the driving mechanism is arranged correspondingly at the start button, and the driving mechanism and the deceleration and grinding mechanism are driven in a corresponding matching manner. The cutting motor is started by pressing the driving mechanism, and when the driving mechanism is released, the compression spring pushes the deceleration and grinding mechanism to resist the rotating cutting blade to decelerate and grind it.

[0012] The present invention is further configured such that both the protective shell and the bracket are provided with through holes, and the through holes on the protective shell and the bracket are coaxially arranged;

[0013] The deceleration grinding mechanism includes a guide assembly movably plugged into the through holes on the protective shell and the bracket, a deceleration grinding assembly arranged at the bottom end of the guide assembly and located in the protective shell, and a retaining ring arranged on the guide assembly;

[0014] The extrusion spring is sleeved on the outside of the circumference of the guide assembly, one end of the extrusion spring abuts against the top of the retaining ring, and the other end of the extrusion spring abuts against the inner wall of the U-shaped groove of the bracket.

[0015] The present invention is further configured such that the guide assembly includes a driving rod movably penetrating a through hole on the bracket, and also includes a guiding rod rotatably mounted on the bottom end of the driving rod;

[0016] The retaining ring is welded to one end of the circumferential side wall of the driving rod close to the guide rod, and the extrusion spring is sleeved on the outside of the driving rod;

[0017] When the deceleration grinding assembly contacts the cutting blade, there is a spacing between the retaining ring and the outer wall of the protective shell for plugging in the driving mechanism.

[0018] The present invention is further configured such that the deceleration grinding assembly comprises a deceleration grinding block arranged at one end of the guide rod away from the driving rod, and directional rollers arranged at both sides of the deceleration grinding block;

[0019] A V-shaped groove matching with a cutting blade is formed at one end of the deceleration grinding block away from the guide rod, and a grinding blade for deceleration grinding is arranged on the inner wall of the V-shaped groove.

[0020] The present invention is further configured such that the driving mechanism comprises a synchronous housing arranged on the handheld handle, and an elastic toggle assembly arranged on one side of the synchronous housing.

[0021] The present invention is further configured such that a strip groove is provided on a side of the bracket close to the synchronous housing, and the strip groove is slidably matched with the elastic toggle assembly;

[0022] The elastic toggle assembly includes a sleeve rod fixedly mounted on one side of the synchronous housing, a telescopic rod movably inserted in the sleeve rod, and an elastic member arranged at one end of the sleeve rod close to the synchronous housing and penetrating the side wall of the sleeve rod.

[0023] The present invention is further configured such that a switching block is provided at one end of the circumferential side wall of the driving rod close to the guide rod, and the switching block is provided below the retaining ring, and there is a downward shifting spacing between the switching block and the protective shell for reducing the friction loss of the grinding block, and the side wall of the switching block abuts against one end of the driving mechanism, and the position of the driving mechanism is adjusted by rotation;

[0024] One end of the driving rod away from the switching block passes through the bracket and extends to the top thereof, and one end of the driving rod away from the switching block passes through the bracket and extends to the top thereof is provided with a knob, and there is a distance between the knob and the top end of the bracket.

[0025] The present invention is further configured such that a switching plane is provided on the switching block;

[0026] A positioning rod is arranged on the circumferential side wall of the switching block, and a positioning column matching the positioning rod is arranged on the outer wall of the protective shell.

[0027] The present invention is further configured such that a strip plate is provided on the inner wall where the strip groove is located on the bracket, and the strip plates are respectively arranged on both sides of the strip groove, and a guide groove is opened on the strip plate, and the guide groove is arranged in an L shape;

[0028] Limiting posts are arranged on both sides of one end of the telescopic rod away from the elastic member, and the limiting posts are slidably matched with the guide grooves.

[0029] The present invention is further configured such that T-shaped blocks are provided on both sides of the inner wall of the synchronous housing, and a mounting groove that is slidably matched with the T-shaped block is provided on the handheld handle.

[0030] (III) Beneficial effects

[0031] Compared with the prior art, the present invention provides a cutting device for highway engineering plates, which has the following beneficial effects:

[0032] 1. The present invention arranges a deceleration grinding mechanism and a driving mechanism so that after the cutting motor stops working, the inertial power of the cutting blade can be fully utilized. When the operator releases the driving mechanism, the extrusion spring pushes the deceleration grinding mechanism to contact the cutting blade that is still rotating. The contact between the grinding disc on the deceleration grinding mechanism and the cutting blade not only realizes instant grinding of the blade to maintain its sharpness for the next cutting, but also effectively slows down the rotation speed of the blade so that it stops quickly in a short time. This design not only improves the construction efficiency, but also significantly enhances the safety of operation and reduces the risk of injury caused by the inertial rotation of the blade.

[0033] 2. The present invention provides a switching block so that the operator can rotate the switching block by rotating the knob, thereby changing the relative position between the telescopic rod and the retaining ring. This adjustment enables the deceleration grinding mechanism to be switched to an active grinding mode when necessary, that is, when the cutting blade rotates at high speed, the deceleration grinding mechanism can still contact and grind it, further improving the sharpness and service life of the blade. This design not only meets the needs of daily cutting operations, but also provides the flexibility of enhanced grinding of the blade under special circumstances. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a cutting device for highway engineering plates.

[0035] Figure 2 Schematic diagram of the exploded structure of a cutting device for highway engineering plates.

[0036] Figure 3 This is a structural schematic diagram of the deceleration and grinding mechanism on the protective shell.

[0037] Figure 4 for Figure 3 Enlarged structural diagram at A in the middle.

[0038] Figure 5 Schematic diagram of the exploded structure of the driving mechanism.

[0039] Figure 6 It is a structural schematic diagram of the deceleration grinding mechanism adjusted to the active grinding mode.

[0040] Figure 7 for Figure 6 Enlarged structural diagram at B in the middle.

[0041] Figure 8It is a structural schematic diagram of the deceleration grinding mechanism.

[0042] In the figure: 1. cutting motor; 101. hand-held handle; 102. mounting slot; 2. cutting blade; 3. protective shell; 301. positioning column; 4. bracket; 401. strip groove; 402. strip plate; 403. guide groove; 5. deceleration grinding mechanism; 501. retaining ring; 6. extrusion spring; 7. driving mechanism; 701. synchronous housing; 702. T-block; 8. guiding assembly; 801. driving rod; 802. guide rod; 803. switching block; 804. knob; 805. switching plane; 806. positioning rod; 9. deceleration grinding assembly; 901. deceleration grinding block; 902. directional roller; 903. V-groove; 10. elastic toggle assembly; 1001. sleeve rod; 1002. telescopic rod; 1003. elastic member; 1004. limiting column. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application 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.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0046] For examples, see Figure 1 - Figure 8 , a cutting device for highway engineering plates, comprising a cutting motor 1, a cutting blade 2 is fixedly mounted on the output shaft of the cutting motor 1, and a protective shell 3 is fixedly mounted on one end of the cutting motor 1 close to the output shaft, the protective shell 3 is used to shield the material splashing caused by cutting, and a hand-held handle 101 is provided at one end of the circumferential side wall of the cutting motor 1 close to the protective shell 3, and a start button is provided on the hand-held handle 101, which is used to start the cutting motor 1 to drive the cutting blade 2 to rotate;

[0047] The outer wall of the protective shell 3 is provided with a bracket 4, the bracket 4 is U-shaped, and the two ends of the U-shaped opening of the bracket 4 are welded to the outer wall of the protective shell 3, and a movable plug-in deceleration grinding mechanism 5 is provided inside the protective shell 3, and the deceleration grinding mechanism 5 penetrates into the U-shaped groove of the bracket 4, and an extrusion spring 6 is provided inside the bracket 4, and the extrusion spring 6 is used to push the deceleration grinding mechanism 5 to resist the cutting blade 2;

[0048] A driving mechanism 7 is provided on the handheld handle 101, and the driving mechanism 7 is correspondingly arranged at the start button, and the driving mechanism 7 and the deceleration and grinding mechanism 5 are correspondingly matched and driven. The cutting motor 1 is started by pressing the driving mechanism 7, and when the driving mechanism 7 is released, the compression spring 6 pushes the deceleration and grinding mechanism 5 to resist the rotating cutting blade 2 to decelerate and grind it.

[0049] The start button on the handheld handle 101 is of elastic pressing type, and the driving mechanism 7 is connected to the start button of the handheld handle 101. Therefore, when the driving mechanism 7 is gripped, the start button is pressed, so that the cutting motor 1 is started. At the same time, by gripping the driving mechanism 7, the deceleration grinding mechanism 5 is driven to move away from the cutting blade 2, so as to avoid the deceleration grinding mechanism 5 and the cutting blade 2 from rubbing when the equipment is started to cut the plate, resulting in increased power consumption of the equipment. In addition, when the driving mechanism 7 is gripped to drive the deceleration grinding mechanism 5 to move away from the cutting blade 2, the compression spring 6 is pressed. The cutting blade 2 is compressed, so after the plate cutting is completed, the compressed extrusion spring 6 will push the deceleration and grinding mechanism 5 to fit the cutting blade 2, applying a certain friction force to the cutting blade 2, so that the cutting blade 2 can stop quickly, reducing the possibility of injury to personnel caused by the inertial kinetic energy rotation of the cutting blade 2, thereby improving the safety of equipment use, and after the cutting of the cutting blade 2 is completed, after the deceleration and grinding mechanism 5 contacts the cutting blade 2, grinding is generated between the rotation of the inertial kinetic energy of the cutting blade 2 and the deceleration and grinding mechanism 5, thereby improving the sharpness of the cutting blade 2, facilitating subsequent cutting operations.

[0050] The protective shell 3 and the bracket 4 are both provided with vias, and the vias on the protective shell 3 and the bracket 4 are coaxially arranged;

[0051] The deceleration and grinding mechanism 5 includes a guide assembly 8 movably inserted into the through holes on the protective shell 3 and the bracket 4, a deceleration and grinding assembly 9 arranged at the bottom end of the guide assembly 8 and located in the protective shell 3, and a retaining ring 501 arranged on the guide assembly 8;

[0052] The extrusion spring 6 is sleeved on the outer circumference of the guide assembly 8 , one end of the extrusion spring 6 abuts against the top of the retaining ring 501 , and the other end of the extrusion spring 6 abuts against the inner wall of the U-shaped groove of the bracket 4 .

[0053] In the initial state, the extrusion spring 6 pushes the retaining ring 501 to move toward the protective shell 3, driving the guide assembly 8 to move accordingly. The movement of the guide assembly 8 drives the deceleration grinding assembly 9 to contact the cutting blade 2, so that the cutting blade 2 and the deceleration grinding assembly 9 are in contact friction when the equipment is not started.

[0054] Specifically, under the action of the driving mechanism 7, when the equipment is started, the guide assembly 8 will be driven to move upward, so that the deceleration and grinding assembly 9 will be separated from the cutting blade 2, avoiding the deceleration and grinding assembly 9 from contacting the cutting blade 2 when the equipment is cutting, thereby increasing the power consumption of cutting and grinding, and enabling it to reset by squeezing the spring 6 after the cutting and grinding is completed, to grind the cutting blade 2 and quickly reduce the rotation speed of the cutting blade 2.

[0055] The guide assembly 8 includes a driving rod 801 that movably passes through a through hole on the bracket 4, and also includes a guiding rod 802 that is rotatably mounted on the bottom end of the driving rod 801;

[0056] The retaining ring 501 is welded to one end of the circumferential side wall of the driving rod 801 close to the guide rod 802, and the extrusion spring 6 is sleeved on the outside of the driving rod 801;

[0057] When the deceleration grinding assembly 9 contacts the cutting blade 2 , there is a gap between the retaining ring 501 and the outer wall of the protective shell 3 for plugging the driving mechanism 7 .

[0058] In the initial state of the driving mechanism 7, one end of the driving mechanism 7 is inserted into the gap between the retaining ring 501 and the outer wall of the protective shell 3, so that when the driving mechanism 7 is tightened, it is inserted between the retaining ring 501 and the outer wall of the protective shell 3. The driving mechanism 7 pushes the retaining ring 501 to move away from the cutting blade 2, so that the driving rod 801 drives the guide rod 802 to move upward, thereby causing the deceleration grinding assembly 9 to detach from the cutting blade 2.

[0059] The deceleration grinding assembly 9 includes a deceleration grinding block 901 disposed at one end of the guide rod 802 away from the driving rod 801, and directional rollers 902 disposed on both sides of the deceleration grinding block 901;

[0060] A V-shaped groove 903 matching with the cutting blade 2 is formed at one end of the deceleration grinding block 901 away from the guide rod 802 , and a grinding blade for deceleration grinding is arranged on the inner wall of the V-shaped groove 903 .

[0061] Two groups of directional rollers 902 are symmetrically arranged on both sides of the deceleration grinding block 901, and the directional rollers 902 fit the inner walls on both sides of the protective shell 3, so that the deceleration grinding block 901 will not deflect in position when moving up and down, so that the V-groove 903 on the deceleration grinding block 901 can always correspond to the cutting blade 2, and then after cutting, the deceleration grinding block 901 is reset under the action of the extrusion spring 6, the V-groove 903 and the cutting blade 2 are in conflict, and the cutting blade 2 is ground and decelerated through the grinding blade on the inner wall of the V-groove 903.

[0062] The driving mechanism 7 includes a synchronous housing 701 disposed on the handheld handle 101 , and an elastic toggle assembly 10 disposed on one side of the synchronous housing 701 .

[0063] The synchronous housing 701 is U-shaped and corresponds to the bottom of the start button on the handheld handle 101. By holding the synchronous housing 701 tightly, the start button will be pressed synchronously to start the cutting motor 1. The U-shaped sides of the synchronous housing 701 are arranged on both sides of the handheld handle 101, but its size does not exceed the top of the handheld handle 101, so that when it is held tightly, it will not move upward and hit the palm.

[0064] Specifically, the elastic toggle assembly 10 is fixedly installed on one side of the synchronous housing 701 close to the bracket 4, and the U-shaped side wall of the elastic toggle assembly 10 and the synchronous housing 701 are vertically arranged, and the end of the elastic toggle assembly 10 away from the synchronous housing 701 is inserted into the gap between the retaining ring 501 and the protective shell 3.

[0065] A strip groove 401 is formed on one side of the bracket 4 close to the synchronous housing 701, and the strip groove 401 is slidably matched with the elastic toggle assembly 10;

[0066] The elastic toggle assembly 10 includes a sleeve rod 1001 fixedly mounted on one side of the synchronous housing 701 , a telescopic rod 1002 movably inserted into the sleeve rod 1001 , and an elastic member 1003 arranged at one end of the sleeve rod 1001 close to the synchronous housing 701 and penetrating the side wall of the sleeve rod 1001 .

[0067] The elastic member 1003 is an elastic sheet or an elastic strip, such as a rubber sheet, a rubber band, etc. Although it is arranged at one end of the sleeve rod 1001 close to the synchronous housing 701, it still retains a certain distance from the synchronous housing 701. The distance needs to ensure that after the telescopic rod 1002 is contracted, the end of the telescopic rod 1002 away from the synchronous housing 701 is located outside the diameter of the retaining ring 501.

[0068] In its initial state, the telescopic rod 1002 is hindered by the elastic member 1003, so that the end of the telescopic rod 1002 away from the synchronous housing 701 is inserted into the gap between the retaining ring 501 and the protective shell 3, and fits into the outer wall of the driving rod 801. After the telescopic rod 1002 is inserted between the retaining ring 501 and the protective shell 3, there is still a distance between the telescopic rod 1002 and the retaining ring 501, and the distance is for providing a downward distance to reduce the friction loss of the grinding block 901.

[0069] A switching block 803 is provided at one end of the circumferential side wall of the driving rod 801 close to the guide rod 802, and the switching block 803 is provided below the retaining ring 501. There is a downward movement spacing between the switching block 803 and the protective shell 3 for reducing the friction loss of the grinding block 901, and the side wall of the switching block 803 abuts against one end of the driving mechanism 7, and the position of the driving mechanism 7 is adjusted by rotation;

[0070] One end of the driving rod 801 away from the switching block 803 passes through the bracket 4 and extends to the top thereof, and a knob 804 is provided on the other end of the driving rod 801 away from the switching block 803 and extends to the top thereof, and there is a distance between the knob 804 and the top of the bracket 4.

[0071] The switching block 803 and the driving rod 801 are integrally formed, and the minimum diameter of the switching block 803 is the same as the diameter of the driving rod 801, and its maximum diameter is larger than the diameter of the retaining ring 501. In the initial state, the side wall of the minimum diameter of the switching block 803 abuts against one end of the telescopic rod 1002, so that one end of the telescopic rod 1002 is inserted between the retaining ring 501 and the protective shell 3, and when the driving mechanism 7 moves toward the retaining ring 501 by gripping, it can drive the retaining ring 501 to move away from the cutting blade 2, so that the grinding blade in the V-groove 903 on the deceleration grinding block 901 is separated from the cutting blade 2, so that the cutting blade 2 can rotate and cut normally without increasing power consumption.

[0072] Furthermore, when the device is in use, when the cutting blade 2 cannot ensure the sharpness of the cutting blade 2 through the grinding between the inertial rotation of the cutting blade and the deceleration grinding block 901, the knob 804 is turned to make the driving rod 801 drive the switching block 803 to rotate, so that the side wall of the maximum diameter of the switching block 803 pushes the telescopic rod 1002 to move toward the elastic member 1003, until the side wall of the maximum diameter of the switching block 803 pushes the end of the telescopic rod 1002 away from the elastic member 1003 out of between the retaining ring 501 and the protective shell 3, and is located outside the outer diameter of the retaining ring 501 At this time, when the synchronous housing 701 is tightly gripped, only the cutting motor 1 is started to drive the cutting blade 2 to rotate. Since the end of the telescopic rod 1002 away from the elastic member 1003 is located outside the outer diameter of the retaining ring 501, when it is tightly gripped, the synchronous housing 701 drives the telescopic rod 1002 to move, but cannot drive the retaining ring 501 to move, resulting in the deceleration grinding block 901 abutting against the cutting blade 2 under the action of the extrusion spring 6. As a result, the high-speed rotating cutting blade 2 can actively grind with the deceleration grinding block 901 abutting against the cutting blade 2, thereby improving the sharpness of the cutting blade 2.

[0073] A switching plane 805 is provided on the switching block 803;

[0074] A positioning rod 806 is provided on the circumferential side wall of the switching block 803 , and a positioning column 301 matching the positioning rod 806 is provided on the outer wall of the protective shell 3 .

[0075] The switching plane 805 is arranged at the maximum diameter end of the switching block 803, and is used to rotate and push the end of the telescopic rod 1002 to contact it, thereby locking the position. The positioning rod 806 and the positioning column 301 are used to control the rotation angle of the driving rod 801, that is, the knob 804 drives the driving rod 801 to rotate. When the positioning rod 806 rotates with the driving rod 801 to contact the positioning column 301, the switching plane 805 on the switching block 803 fits the end of the telescopic rod 1002, so that the end of the telescopic rod 1002 away from the elastic member 1003 is located outside the diameter of the retaining ring 501, and the cutting blade 2 can be driven to rotate by squeezing and starting the cutting motor 1 without driving the deceleration grinding block 901 to separate from the cutting blade 2.

[0076] Furthermore, after the switching plane 805 rotates to contact the end of the telescopic rod 1002, the position is locked, thereby avoiding the contact between the telescopic rod 1002 and the side wall of the switching block 803, which causes the driving rod 801 to rotate slightly, so that the end of the telescopic rod 1002 is inserted into the space between the retaining ring 501 and the protective shell 3 along the curved surface of the switching block 803, so that when the synchronous shell 701 is gripped, it will drive the retaining ring 501 away from the cutting blade 2, thereby driving the deceleration grinding block 901 away from the cutting blade 2 and unable to actively grind the cutting blade 2.

[0077] A strip plate 402 is provided on the inner wall of the bracket 4 where the strip groove 401 is located, and the strip plates 402 are respectively provided on both sides of the strip groove 401. A guide groove 403 is provided on the strip plate 402, and the guide groove 403 is provided in an L shape;

[0078] Limiting posts 1004 are arranged on both sides of one end of the telescopic rod 1002 away from the elastic member 1003 , and the limiting posts 1004 and the guide groove 403 are slidably matched.

[0079] The horizontal section of the L-shaped guide groove 403 passes through the bottom of the end of the strip plate 402 away from the inner wall of the bracket 4, and is used for the sliding entry of the limit column 1004 when the switching block 803 pushes the telescopic rod 1002 to move, so that when the cutting blade 2 is actively polished and the cutting motor 1 is started by holding the synchronous housing 701, the telescopic rod 1002 is driven to move upward, and when it exceeds the height of the switching block 803, it will not be stretched out due to the action of the elastic member 1003, causing it to be unable to move down and reset.

[0080] T-shaped blocks 702 are disposed on both sides of the inner wall of the synchronous housing 701 , and a mounting groove 102 slidably matched with the T-shaped blocks 702 is provided on the handheld handle 101 .

[0081] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described one by one here. In the above, welding is preferred for all fixed connections. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and deformations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cutting device for highway engineering plates, characterized by: The invention comprises a cutting motor (1), a cutting blade (2) being fixedly mounted on the output shaft of the cutting motor (1), and a protective shell (3) being fixedly mounted on one end of the cutting motor (1) close to the output shaft, the protective shell (3) being used to shield material splashing generated by cutting, and a hand-held handle (101) being provided at one end of the circumferential side wall of the cutting motor (1) close to the protective shell (3), and a start button being provided on the hand-held handle (101) for starting the cutting motor (1) to drive the cutting blade (2) to rotate; The outer wall of the protective shell (3) is provided with a bracket (4), the bracket (4) is U-shaped, and the two ends of the U-shaped opening of the bracket (4) are welded to the outer wall of the protective shell (3), the protective shell (3) is provided with a movably plug-in deceleration and grinding mechanism (5), and the deceleration and grinding mechanism (5) penetrates into the U-shaped groove of the bracket (4), and the bracket (4) is provided with a compression spring (6), and the compression spring (6) is used to push the deceleration and grinding mechanism (5) to contact the cutting blade (2); The handheld handle (101) is provided with a driving mechanism (7), and the driving mechanism (7) is correspondingly arranged at the start button, and the driving mechanism (7) and the deceleration and grinding mechanism (5) are correspondingly matched and driven, and the cutting motor (1) is started by pressing the driving mechanism (7), and when the driving mechanism (7) is released, the compression spring (6) pushes the deceleration and grinding mechanism (5) to resist the rotating cutting blade (2) to decelerate and grind it.

2. The cutting device for highway engineering plates according to claim 1 is characterized in that: The protective shell (3) and the bracket (4) are both provided with through holes, and the through holes on the protective shell (3) and the bracket (4) are coaxially arranged; The deceleration and grinding mechanism (5) comprises a guide assembly (8) movably plugged into through holes on the protective shell (3) and the bracket (4), a deceleration and grinding assembly (9) arranged at the bottom end of the guide assembly (8) and located inside the protective shell (3), and a retaining ring (501) arranged on the guide assembly (8); The extrusion spring (6) is sleeved on the outside of the circumference of the guide assembly (8), one end of the extrusion spring (6) abuts against the top of the retaining ring (501), and the other end of the extrusion spring (6) abuts against the inner wall of the U-shaped groove of the bracket (4).

3. The cutting device for highway engineering plates according to claim 2 is characterized in that: The guide assembly (8) comprises a driving rod (801) movably penetrating a through hole on the bracket (4), and also comprises a guiding rod (802) rotatably mounted on the bottom end of the driving rod (801); The retaining ring (501) is welded to one end of the circumferential side wall of the driving rod (801) close to the guide rod (802), and the extrusion spring (6) is sleeved on the outside of the driving rod (801); When the deceleration grinding assembly (9) contacts the cutting blade (2), a spacing for plugging the driving mechanism (7) exists between the retaining ring (501) and the outer wall of the protective shell (3).

4. The cutting device for highway engineering plates according to claim 3 is characterized in that: The deceleration grinding assembly (9) comprises a deceleration grinding block (901) arranged at one end of the guide rod (802) away from the driving rod (801), and directional rollers (902) arranged on both sides of the deceleration grinding block (901); The end of the deceleration grinding block (901) away from the guide rod (802) is provided with a V-shaped groove (903) matching the cutting blade (2), and the inner wall of the V-shaped groove (903) is provided with a grinding blade for deceleration grinding.

5. The cutting device for highway engineering plates according to claim 4 is characterized in that: The driving mechanism (7) comprises a synchronous housing (701) arranged on the handheld handle (101), and an elastic toggle assembly (10) arranged on one side of the synchronous housing (701).

6. The cutting device for highway engineering plates according to claim 5 is characterized in that: A strip groove (401) is formed on one side of the bracket (4) close to the synchronous housing (701), and the strip groove (401) and the elastic toggle assembly (10) are slidably matched; The elastic toggle assembly (10) comprises a sleeve rod (1001) fixedly mounted on one side of the synchronous housing (701), a telescopic rod (1002) movably inserted into the sleeve rod (1001), and an elastic member (1003) arranged at one end of the sleeve rod (1001) close to the synchronous housing (701) and penetrating the side wall of the sleeve rod (1001).

7. A cutting device for highway engineering plates according to claim 6, characterized in that: A switching block (803) is provided at one end of the circumferential side wall of the driving rod (801) close to the guide rod (802), and the switching block (803) is arranged below the retaining ring (501). There is a downward displacement distance between the switching block (803) and the protective shell (3) for reducing the friction loss of the grinding block (901), and the side wall of the switching block (803) contacts one end of the driving mechanism (7), and the position of the driving mechanism (7) is adjusted by rotation. One end of the driving rod (801) away from the switching block (803) passes through the bracket (4) and extends to the top thereof, and one end of the driving rod (801) away from the switching block (803) passes through the bracket (4) and extends to the top thereof is provided with a knob (804), and there is a distance between the knob (804) and the top end of the bracket (4).

8. The cutting device for highway engineering plates according to claim 7 is characterized in that: The switching block (803) is provided with a switching plane (805); A positioning rod (806) is provided on the circumferential side wall of the switching block (803), and a positioning column (301) matching the positioning rod (806) is provided on the outer wall of the protective shell (3).

9. A cutting device for highway engineering plates according to claim 8, characterized in that: A strip plate (402) is arranged on the inner wall of the bracket (4) where the strip groove (401) is located, and the strip plates (402) are respectively arranged on both sides of the strip groove (401), and a guide groove (403) is opened on the strip plate (402), and the guide groove (403) is arranged in an L shape; Limiting posts (1004) are arranged on both sides of one end of the telescopic rod (1002) away from the elastic member (1003), and the limiting posts (1004) and the guide groove (403) are slidably matched.

10. The cutting device for highway engineering plates according to claim 9, characterized in that: T-shaped blocks (702) are arranged on both sides of the inner wall of the synchronous housing (701), and the hand-held handle (101) is provided with a mounting groove (102) that slidably matches the T-shaped block (702).

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