A warning strip cleaning device for construction fence renovation

Abstract

The application discloses a warning strip cleaning device for building construction guardrail renovation, and relates to the field of polishing equipment.The technical scheme is as follows: the device comprises a machine body, a middle polishing part arranged on the machine body, a mounting seat, and movable arms connected to the two sides of the mounting seat;each movable arm is provided with a side polishing part;the two movable arms can be switched between a first working position and a second working position;the mounting seat is switched between a first height position and a second height position through a position adjusting mechanism;a driving mechanism drives the middle polishing part to rotate, and drives the two side polishing parts to rotate through a chain transmission assembly, a spline shaft, a bevel gear transmission assembly and a belt transmission assembly.The device has the beneficial effects that it can be switched between a planar polishing state and a square tube three-side polishing state, and the cleaning efficiency of warning strips, residual adhesive layers and rust is improved.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment, and in particular to a device for cleaning warning strips used in the renovation of construction guardrails. Background Technology

[0002] Construction guardrails are typically constructed from welded square tubes, rectangular tubes, and plate-like components. Their surfaces are usually covered with warning strips or reflective tape to improve visibility and alertness in the construction area. Over time, the warning strips are prone to fading, cracking, peeling, and detachment. When reusing or renovating the guardrails, the original warning strips and residual adhesive must be removed to allow for repainting with protective paint or attaching new warning strips.

[0003] Currently, when renovating construction guardrails, a wire grinding wheel is typically installed on an angle grinder. The high-speed rotation of the wire grinding wheel cleans warning strips, residual adhesive, loose rust, and loose paint. The wire grinding wheel has a relatively small cutting radius on the guardrail substrate and can accommodate slight unevenness on the guardrail surface, making it suitable for guardrail renovation and cleaning.

[0004] However, existing angle grinders typically only have one wire grinding wheel, allowing them to clean only one surface of the railing at a time. For railing components made of square tubing, operators need to repeatedly adjust the grip and grinding angle of the angle grinder to grind the top surface and two side surfaces of the square tubing in sequence. This involves many steps, resulting in low cleaning efficiency, and it is difficult to maintain consistent grinding pressure and cleaning level across different surfaces.

[0005] Furthermore, the effective grinding width of a single wire grinding wheel is limited. When cleaning plate-shaped components or large flat surfaces in the guardrail, operators need to move the angle grinder back and forth multiple times, which can easily lead to repeated grinding or missed areas. The wire grinding wheel on existing angle grinders is in a fixed position and cannot switch between flat grinding mode and multi-faceted grinding mode for square tubes according to the shape of the guardrail components, making it difficult to meet the cleaning needs of both flat and square tube components in the guardrail. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a warning strip cleaning device for the renovation of construction guardrails.

[0007] The technical solution includes a machine body and a drive mechanism mounted on the machine body. A central grinding component is rotatably mounted on the machine body and is connected to the drive mechanism via a transmission connection.

[0008] The machine body is equipped with a mounting base, and movable arms are connected to both sides of the mounting base. Each movable arm is rotatably equipped with a side grinding component, and the two side grinding components are respectively connected to the drive mechanism for transmission.

[0009] Each movable arm can switch between a first working position and a second working position relative to the mounting base. When both movable arms are in the first working position, the grinding areas of the two side grinding components and the central grinding component are on the same grinding plane to jointly grind the planar component. When both movable arms are in the second working position, the two side grinding components are located on both sides of the central grinding component, and the grinding surfaces of the two side grinding components are perpendicular to the grinding surface of the central grinding component, respectively corresponding to the two sides and the top surface of the guardrail square tube.

[0010] Furthermore, the mounting base is slidably mounted on the machine body along the vertical direction, and a position adjustment mechanism is provided between the machine body and the mounting base. The mounting base can switch between a first height position and a second height position through the position adjustment mechanism.

[0011] When the mounting base is in the first height position and both movable arms are in the first working position, the grinding areas of the two side grinding parts and the central grinding part are on the same grinding plane. When both movable arms are in the second working position, the two side grinding parts are located on both sides of the central grinding part, and the grinding surfaces of the two side grinding parts are perpendicular to the grinding surface of the central grinding part. The central grinding part is used to cover the upper surface of the guardrail square tube, and the two side grinding parts are used to cover the two side surfaces of the guardrail square tube.

[0012] Furthermore, the position adjustment mechanism includes a control cam rotatably mounted on the machine body and an adjustment slider slidably mounted on the machine body in the horizontal direction. The control cam has a helical guide groove, and a first pin is fixedly mounted on the adjustment slider, sliding within the helical guide groove. The adjustment slider also has an inclined guide groove extending at an angle relative to the horizontal direction, and a second pin is fixedly mounted on the mounting base, sliding within the inclined guide groove.

[0013] Furthermore, a knob coaxial with the control cam is provided on the outer side of the machine body. The knob is slidably connected to the control cam along the axial direction of the control cam and is circumferentially limited by the control cam. A fixed end face tooth is fixedly provided on the machine body, and a movable end face tooth that mates with the fixed end face tooth is fixedly provided on the knob coaxially.

[0014] A return spring is installed between the knob and the control cam. One end of the return spring abuts against the knob, and the other end abuts against the control cam. When the knob moves towards the control cam, the moving end face teeth separate from the fixed end face teeth, allowing the knob to drive the control cam to rotate. When the return spring pushes the knob back towards the control cam, the moving end face teeth engage with the fixed end face teeth to limit the rotation of the knob and the control cam.

[0015] Furthermore, the two movable arms are respectively rotatably mounted at both ends of the mounting base, and the rotation angle of each movable arm between the first working position and the second working position is ninety degrees.

[0016] Furthermore, vertical grooves extending in a vertical direction are respectively opened at both ends of the mounting base, and a limit rod is slidably installed in each groove. An upwardly extending pull rod is fixedly installed on the limit rod, and a protrusion is provided at the upper end of the pull rod. A limit spring is sleeved on the outside of the pull rod, with one end of the limit spring abutting against the mounting base and the other end abutting against the limit rod.

[0017] Each movable arm is equipped with two limiting surfaces corresponding to the first and second working positions, respectively. A limiting spring pushes a limiting rod against one of the limiting surfaces to restrict the rotation of the movable arm relative to the mounting base. By pulling the protrusion, the pull rod can move the limiting rod along the vertical groove, separating the limiting rod from the currently abutting limiting surface, so that the movable arm can rotate between the first and second working positions.

[0018] Furthermore, the drive mechanism includes a motor and a chain drive assembly housed within the machine body, with the main shaft of the central grinding component being drive-connected to the output end of the motor.

[0019] The chain drive assembly includes a drive sprocket coaxially fixed on the main shaft of the central grinding component, a guide sprocket rotatably mounted on the machine body, and two drive sprockets. The drive sprocket, guide sprocket, and two drive sprockets are connected by a chain drive to transmit the power output from the motor to the two side grinding components respectively.

[0020] Furthermore, both drive sprockets are rotatably mounted on the machine body and axially limited relative to the machine body. Two splined shafts are rotatably mounted on the mounting base, and the two splined shafts pass through the two drive sprockets respectively. Each drive sprocket is circumferentially driven and axially slidingly engaged with the corresponding splined shaft.

[0021] When the mounting base moves between the first height position and the second height position, the two splined shafts move vertically with the mounting base and slide axially relative to the corresponding drive sprockets. The drive sprockets continuously transmit power to the splined shafts through the circumferential transmission engagement with the splined shafts.

[0022] Furthermore, a bevel gear transmission assembly is provided between each splined shaft and the corresponding side grinding part. The bevel gear transmission assembly includes an input bevel gear coaxially fixed on the corresponding splined shaft and an output bevel gear rotatably mounted on the corresponding movable arm. The input bevel gear meshes with the output bevel gear, and the rotation axis of the output bevel gear coincides with the rotation axis of the corresponding movable arm relative to the mounting base.

[0023] Furthermore, each side grinding component is rotatably mounted on a corresponding movable arm via a rotating shaft, and each movable arm is equipped with a belt drive assembly. The belt drive assembly includes a driving pulley coaxially fixed to the corresponding output bevel gear, a driven pulley coaxially fixed to the rotating shaft, and a drive belt wound between the driving pulley and the driven pulley. When the movable arm rotates between the first working position and the second working position, the driving pulley, the driven pulley, and the drive belt rotate together with the movable arm to maintain power transmission between the output bevel gear and the side grinding component.

[0024] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: 1. By cooperating with the central grinding component and the two side grinding components, the device can simultaneously clean the upper surface and the two side surfaces of the guardrail square tube, reducing the operation of adjusting the grinding tools one by one and improving the cleaning efficiency of warning strips, residual adhesive layers and floating rust.

[0025] 2. The two movable arms can switch between the first and second working positions and move between two height positions in conjunction with the mounting base, so that the three grinding parts can form the same grinding plane to clean plate-shaped components or wider planes, and can also form a three-sided grinding structure to adapt to the renovation of square tube guardrails.

[0026] 3. Through the circumferential transmission and axial sliding fit between the transmission sprocket and the spline shaft, the drive mechanism can continue to transmit power to the two side grinding parts when the mounting base is raised and lowered, avoiding the need for a separate side drive motor. The structure is compact and the power transmission is stable.

[0027] 4. The knob locks the height position of the mounting base through the fixed end face teeth and the movable end face teeth. The limit rod positions the two movable arms through the limit surface, so that the device can maintain a stable structural position in both the flat grinding state and the square tube grinding state. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the square tube in the three-sided polishing state according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present invention in the plane grinding state.

[0030] Figure 3 This is a schematic diagram of the internal transmission structure after removing part of the body in an embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of the mounting base, movable arm, and side transmission structure in an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of the position adjustment mechanism in an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the adjusting slider in an embodiment of the present invention.

[0034] The reference numerals in the attached drawings are as follows: 1. Machine body; 2. Middle grinding component; 3. Mounting base; 4. Movable arm; 5. Side grinding component; 6. Position adjustment mechanism; 7. Control cam; 8. Adjusting slider; 9. Spiral guide groove; 10. First pin; 11. Inclined guide groove; 12. Second pin; 13. Knob; 14. Fixed end face tooth; 15. Movable end face tooth; 16. Return spring; 17. Vertical groove; 18. Limiting rod; 19. Pull rod; 20. Limiting spring; 21. Chain drive assembly; 22. Drive sprocket; 23. Guide sprocket; 24. Transmission sprocket; 25. Splined shaft; 26. Input bevel gear; 27. Output bevel gear; 28. Drive pulley; 29. ​​Driven pulley; 30. Transmission belt. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1 See Figures 1 to 6 The present invention provides a warning strip cleaning device for renovation of construction guardrails, including a body 1, a drive mechanism is provided inside the body 1, a handle is provided on the outside of the body 1 for easy gripping by the operator, and a central grinding component 2 is rotatably provided at the lower part of the body 1, the central grinding component 2 being connected to the drive mechanism for transmission.

[0040] The machine body 1 is provided with a mounting base 3, and movable arms 4 are connected to both sides of the mounting base 3. Each movable arm 4 is rotatably provided with a side grinding component 5. The two side grinding components 5 are respectively connected to the drive mechanism, so that the central grinding component 2 and the two side grinding components 5 can be driven to rotate by the same drive mechanism.

[0041] In this embodiment, both the central grinding component 2 and the two side grinding components 5 are steel wire grinding wheels. The steel wire grinding wheel consists of multiple bundles of steel wires distributed circumferentially to form the grinding section. The steel wires have a certain degree of elasticity, allowing them to conform to the slight unevenness of the guardrail surface and the edges of the square tubes during rotation, effectively removing warning strips, reflective stickers, residual adhesive layers, loose rust, and loose paint. Compared to rigid grinding wheels, the steel wire grinding wheel has a smaller cutting amount on the guardrail substrate, ensuring cleaning efficiency while reducing the impact on the wall thickness and dimensions of the square tubes. It can also adapt to localized deformations and uneven welded areas on the guardrail surface. The central grinding component 2 is used to clean the upper surface of the planar components or the square tubes of the guardrail, while the two side grinding components 5 are used to clean the two side surfaces of the planar components or the square tubes of the guardrail under different working conditions.

[0042] Mounting base 3 is vertically slidably mounted on the machine body 1, and can switch between a first height position and a second height position. A position adjustment mechanism 6 is provided between the machine body 1 and the mounting base 3. The position adjustment mechanism 6 includes a control cam 7 and an adjustment slider 8. The control cam 7 is rotatably mounted inside the machine body 1, and the adjustment slider 8 is horizontally slidably mounted inside the machine body 1.

[0043] The control cam 7 has a spiral guide groove 9, and the adjusting slider 8 is fixedly provided with a first pin 10, which is slidably disposed in the spiral guide groove 9. When the control cam 7 rotates, the groove wall of the spiral guide groove 9 pushes the first pin 10 to move, causing the adjusting slider 8 to move in the horizontal direction.

[0044] The adjusting slider 8 is also provided with an inclined guide groove 11, which extends at an angle relative to the moving direction of the adjusting slider 8. A second pin 12 is fixedly provided on the mounting base 3, and the second pin 12 is slidably disposed in the inclined guide groove 11. When the adjusting slider 8 moves in the horizontal direction, the groove wall of the inclined guide groove 11 pushes the second pin 12 to move in the vertical direction, so that the mounting base 3 rises or falls relative to the body 1.

[0045] The two ends of the spiral guide groove 9 correspond to two preset rotation positions of the control cam 7. When the control cam 7 rotates to one of the preset rotation positions, the mounting base 3 is located at the first height position; when the control cam 7 rotates to the other preset rotation position, the mounting base 3 is located at the second height position.

[0046] A knob 13 is provided on the outer side of the body 1, and the knob 13 is coaxially arranged with the control cam 7. The knob 13 is slidably connected to the control cam 7 along the axial direction of the control cam 7, and is also circumferentially limited by the control cam 7, so that the knob 13 can move axially relative to the control cam 7 and drive the control cam 7 to rotate synchronously. The sliding connection between the knob 13 and the control cam 7 can adopt a spline, keyway, or a non-circular shaft hole structure that matches each other.

[0047] A fixed end face tooth 14 is fixedly installed on the body 1, and a movable end face tooth 15 is coaxially fixedly installed on the knob 13. The movable end face tooth 15 is arranged opposite to the fixed end face tooth 14. A return spring 16 is provided between the knob 13 and the control cam 7. The return spring 16 is sleeved on the outside of the connecting shaft between the knob 13 and the control cam 7. One end of the return spring 16 abuts against the knob 13, and the other end abuts against the control cam 7.

[0048] When the height of the mounting base 3 needs to be adjusted, the operator presses the knob 13 towards the control cam 7, compressing the return spring 16 and separating the movable end face tooth 15 from the fixed end face tooth 14. After the movable end face tooth 15 separates from the fixed end face tooth 14, the knob 13 is released from its rotation restriction. The operator then rotates the knob 13, which drives the control cam 7 to rotate. The control cam 7 pushes the adjusting slider 8 to move horizontally through the spiral guide groove 9 and the first pin 10. The adjusting slider 8 then drives the mounting base 3 to move vertically through the inclined guide groove 11 and the second pin 12.

[0049] After the mounting base 3 reaches the corresponding first or second height position, the operator releases the knob 13, and the return spring 16 pushes the knob 13 to move away from the control cam 7, so that the movable end face tooth 15 re-engages with the fixed end face tooth 14, thereby limiting the knob 13 and the control cam 7 from continuing to rotate, and keeping the mounting base 3 at the current height position.

[0050] Two movable arms 4 are rotatably mounted at both ends of the mounting base 3. Each movable arm 4 can rotate relative to the mounting base 3 between a first working position and a second working position, with a rotation angle of 90° between the first and second working positions. When the movable arm 4 rotates between the two working positions, the side grinding component 5 mounted on the movable arm 4 changes its spatial position along with the movable arm 4.

[0051] The mounting base 3 has vertical grooves 17 extending vertically at both ends, and a limit rod 18 is slidably installed in each groove 17. Each limit rod 18 is fixedly equipped with an upwardly extending pull rod 19, the upper end of which extends out of the mounting base 3 and has a protrusion for the operator to hold or pull.

[0052] A limiting spring 20 is sleeved on the outside of the pull rod 19. One end of the limiting spring 20 abuts against the mounting base 3, and the other end abuts against the limiting rod 18. The limiting spring 20 applies an elastic force to the limiting rod 18 toward the movable arm 4.

[0053] Each movable arm 4 is provided with two limiting surfaces, which correspond to the first working position and the second working position, respectively. When the movable arm 4 is in one of the working positions, the limiting spring 20 pushes the limiting rod 18 against the corresponding limiting surface to limit the movable arm 4 from continuing to rotate relative to the mounting base 3.

[0054] When it is necessary to switch the working position of the movable arm 4, the operator pulls the protrusion at the top of the pull rod 19 upwards. The pull rod 19 drives the limit rod 18 to move upwards along the vertical groove 17 and compresses the limit spring 20, causing the limit rod 18 to separate from the currently abutting limit surface. Then, the operator manually rotates the movable arm 4 90° to another working position, and then releases the protrusion. The limit spring 20 pushes the limit rod 18 back to its original position, causing the limit rod 18 to abut against another limit surface of the movable arm 4.

[0055] The drive mechanism includes a motor and a chain drive assembly 21 housed within the machine body 1. The central grinding component 2 is mounted on the central grinding component spindle, which is connected to the output end of the motor. After the motor starts, the central grinding component spindle drives the central grinding component 2 to rotate.

[0056] The chain drive assembly 21 includes a drive sprocket 22, a guide sprocket 23, two drive sprockets 24, and a chain. The drive sprocket 22 is coaxially fixed to the main shaft of the central grinding component 2. The guide sprocket 23 is rotatably mounted inside the machine body 1, and the two drive sprockets 24 are rotatably mounted on both sides of the machine body 1. The chain is wound around the outside of the drive sprocket 22, the guide sprocket 23, and the two drive sprockets 24. The guide sprocket 23 is used to change the winding path of the chain within the machine body 1, so that the chain can simultaneously engage with the two drive sprockets 24.

[0057] Two drive sprockets 24 are rotatably mounted on the machine body 1 via bearings and are axially limited relative to the machine body 1, so that the two drive sprockets 24 can rotate relative to the machine body 1, but cannot move up and down with the mounting base 3.

[0058] Two splined shafts 25 are rotatably mounted on the mounting base 3, and each splined shaft 25 corresponds to one of the two transmission sprockets 24. Each splined shaft 25 passes through the corresponding transmission sprocket 24, and the center hole of the transmission sprocket 24 is provided with an internal spline that mates with the splined shaft 25, so that the transmission sprocket 24 and the splined shaft 25 form a circumferential transmission and axial sliding fit.

[0059] When the drive sprocket 22 rotates with the main shaft of the central grinding component 2, it drives the guide sprocket 23 and two drive sprockets 24 to rotate via a chain. The two drive sprockets 24 respectively drive the corresponding spline shafts 25 to rotate. When the mounting base 3 moves between the first height position and the second height position, the two spline shafts 25 move up and down synchronously with the mounting base 3 and slide axially relative to the corresponding drive sprockets 24. The two drive sprockets 24 can still transmit torque to the spline shafts 25 during the movement of the spline shafts 25.

[0060] Each splined shaft 25 is connected to a corresponding side-grinding component 5 by a bevel gear transmission assembly. Each bevel gear transmission assembly includes an input bevel gear 26 and an output bevel gear 27. The input bevel gear 26 is coaxially fixed to the corresponding splined shaft 25. The input bevel gear 26 rotates synchronously with the splined shaft 25 and moves up and down synchronously with the mounting base 3.

[0061] The output bevel gear 27 is rotatably mounted on the corresponding movable arm 4. The input bevel gear 26 meshes with the output bevel gear 27 to change the direction of power transmission. The rotation axis of the output bevel gear 27 coincides with the rotation axis of the corresponding movable arm 4 relative to the mounting base 3, so that when the movable arm 4 rotates between the first working position and the second working position, the meshing center position of the input bevel gear 26 and the output bevel gear 27 remains unchanged.

[0062] Each side grinding component 5 is rotatably mounted on a corresponding movable arm 4 via a rotating shaft, and each movable arm 4 is equipped with a belt drive assembly. The belt drive assembly includes a driving pulley 28, a driven pulley 29, and a drive belt 30. The driving pulley 28 is coaxially fixed with the corresponding output bevel gear 27, and the driven pulley 29 is coaxially fixed on the rotating shaft of the side grinding component 5. The rotation axis of the driving pulley 28 is perpendicular to the rotation axis of the driven pulley 29, and the driving pulley 28 and the driven pulley 29 are spaced apart.

[0063] A transmission belt 30 is wound between the driving pulley 28 and the driven pulley 29. The transmission belt 30 forms a spatial torsion section between the driving pulley 28 and the driven pulley 29, allowing the transmission belt 30 to engage with both the driving pulley 28 and the driven pulley 29 respectively, thereby transmitting power when the rotation axes of the two pulleys are perpendicular and spaced apart. The transmission belt 30 is a flexible transmission belt capable of spatial torsion. The outer periphery of the driving pulley 28 and the driven pulley 29 are respectively provided with grooves adapted to the transmission belt 30 to prevent the transmission belt 30 from detaching along the axial direction of the pulleys.

[0064] When the output bevel gear 27 rotates, it drives the driving pulley 28 to rotate synchronously. The driving pulley 28 drives the driven pulley 29 to rotate via the transmission belt 30. The driven pulley 29 drives the corresponding side grinding part 5 to rotate via the rotating shaft. Through the meshing between the input bevel gear 26 and the output bevel gear 27, the power transmitted by the spline shaft 25 is reversed to the driving pulley 28, and then transmitted to the driven pulley 29, which is perpendicular to the axis of the driving pulley 28, via the spatially torsional transmission belt 30.

[0065] The driving pulley 28, driven pulley 29, and transmission belt 30 are all mounted on the corresponding movable arm 4. When the movable arm 4 rotates between the first working position and the second working position, the driving pulley 28, driven pulley 29, and transmission belt 30 rotate as a whole with the movable arm 4. The relative position, axial angle, and center distance between the driving pulley 28 and the driven pulley 29 remain unchanged, so that the belt drive assembly can maintain power transmission when the movable arm 4 is in both working positions.

[0066] When performing surface grinding, first press and turn knob 13 with the machine stopped to move mounting base 3 to the first height position. Then pull the protrusions at the top of the two pull rods 19 to release the two limit rods 18 from restricting the two movable arms 4. Then rotate the two movable arms 4 to the first working position and release the protrusions so that the two limit rods 18 abut against the corresponding limit surfaces.

[0067] When both movable arms 4 are in the first working position, the grinding areas of the two side grinding parts 5 and the central grinding part 2 are on the same grinding plane. After the motor is started, the central grinding part 2 and the two side grinding parts 5 rotate simultaneously. The operator holds the handle on the machine body 1 and moves the device along the plane to be cleaned, so that the three steel wire grinding wheels can brush away the warning strips, reflective stickers and residual adhesive layers on the plane.

[0068] When grinding the guardrail square tubes, press and turn knob 13 while the machine is stopped to move mounting base 3 to the second height position. Then pull the protrusions at the top of the two pull rods 19 to rotate the two movable arms 4 90° from the first working position to the second working position. Then release the protrusions so that the limit rods 18 abut against the limit surfaces corresponding to the second working positions.

[0069] When both movable arms 4 are in the second working position, the two side grinding parts 5 are located on both sides of the central grinding part 2, and the grinding surfaces of the two side grinding parts 5 are perpendicular to the grinding surface of the central grinding part 2. In use, the central grinding part 2 corresponds to the upper surface of the guardrail square tube, and the two side grinding parts 5 correspond to the two side surfaces of the guardrail square tube. After starting the motor, the operator holds the handle and, as needed, presses the upper part of the machine body 1 with the other hand to push the device along the length of the guardrail square tube, so that the three wire grinding wheels clean the three surfaces of the guardrail square tube simultaneously.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A warning strip cleaning device for renovation of construction guardrails, comprising a body (1) and a drive mechanism disposed on the body (1), characterized in that, A central grinding component (2) is rotatably mounted on the body (1), and the central grinding component (2) is connected to the drive mechanism via transmission. The body (1) is provided with a mounting base (3), and movable arms (4) are connected to both sides of the mounting base (3). Each movable arm (4) is rotatably provided with a side grinding part (5), and the two side grinding parts (5) are respectively connected to the drive mechanism. Each of the movable arms (4) can switch between a first working position and a second working position relative to the mounting base (3); when both movable arms (4) are in the first working position, the grinding parts of the two side grinding parts (5) and the middle grinding part (2) are on the same grinding plane; When both of the movable arms (4) are in the second working position, the two side grinding parts (5) are located on both sides of the middle grinding part (2), and the grinding surfaces of the two side grinding parts (5) are respectively set perpendicular to the grinding surface of the middle grinding part (2).

2. The warning strip cleaning device for renovation of construction guardrails according to claim 1, characterized in that, The mounting base (3) is slidably mounted on the body (1) along the vertical direction. A position adjustment mechanism (6) is provided between the body (1) and the mounting base (3). The mounting base (3) can switch between a first height position and a second height position through the position adjustment mechanism (6). When the mounting base (3) is located at the first height position and the two movable arms (4) are located at the first working position, the grinding parts of the two side grinding parts (5) and the middle grinding part (2) are on the same grinding plane. When the mounting base (3) is in the second height position and the two movable arms (4) are in the second working position, the two side grinding parts (5) are respectively located on both sides of the middle grinding part (2), and the grinding surfaces of the two side grinding parts (5) are respectively set perpendicular to the grinding surface of the middle grinding part (2).

3. The warning strip cleaning device for renovation of construction guardrails according to claim 2, characterized in that, The position adjustment mechanism (6) includes a control cam (7) rotatably mounted on the body (1) and an adjustment slider (8) slidably mounted on the body (1) in the horizontal direction. The control cam (7) has a spiral guide groove (9), and the adjustment slider (8) has a first pin (10) fixedly mounted on it. The first pin (10) is slidably mounted in the spiral guide groove (9). The adjusting slider (8) is also provided with an inclined guide groove (11) that extends at an angle relative to the horizontal direction. A second pin (12) is fixedly provided on the mounting base (3), and the second pin (12) is slidably disposed in the inclined guide groove (11).

4. The warning strip cleaning device for renovation of construction guardrails according to claim 3, characterized in that, The outer side of the body (1) is provided with a knob (13) coaxial with the control cam (7). The knob (13) is slidably connected to the control cam (7) along the axial direction of the control cam (7) and is circumferentially limited by the control cam (7). A fixed end face tooth (14) is fixedly provided on the body (1), and a movable end face tooth (15) that cooperates with the fixed end face tooth (14) is fixedly provided on the knob (13) on the same axis. A return spring (16) is provided between the knob (13) and the control cam (7). One end of the return spring (16) abuts against the knob (13), and the other end abuts against the control cam (7). When the knob (13) moves in a direction close to the control cam (7), the movable end face tooth (15) separates from the fixed end face tooth (14). When the reset spring (16) pushes the knob (13) to reset in a direction away from the control cam (7), the movable end face tooth (15) engages with the fixed end face tooth (14).

5. The warning strip cleaning device for renovation of construction guardrails according to claim 1, characterized in that, The two movable arms (4) are respectively rotatably disposed at both ends of the mounting base (3), and the rotation angle of each movable arm (4) between the first working position and the second working position is 90°.

6. The warning strip cleaning device for renovation of construction guardrails according to claim 5, characterized in that, The mounting base (3) has vertical grooves (17) extending vertically at both ends. Each vertical groove (17) is slidably provided with a limit rod (18). A pull rod (19) extending upward is fixedly provided on the limit rod (18). A protrusion is provided at the upper end of the pull rod (19). A limit spring (20) is sleeved on the outside of the pull rod (19). One end of the limit spring (20) abuts against the mounting base (3), and the other end abuts against the limit rod (18). Each of the movable arms (4) is provided with two limiting surfaces corresponding to the first working position and the second working position respectively. The limiting spring (20) pushes the limiting rod (18) against one of the limiting surfaces to restrict the movable arm (4) from rotating relative to the mounting base (3).

7. The warning strip cleaning device for renovation of construction guardrails according to claim 1, characterized in that, The drive mechanism includes a motor and a chain drive assembly (21) disposed in the body (1), and the main shaft of the central grinding part (2) is connected to the output end of the motor. The chain drive assembly (21) includes a drive sprocket (22) coaxially fixed on the main shaft of the central grinding component (2), a guide sprocket (23) rotatably mounted on the machine body (1), and two drive sprockets (24). The drive sprocket (22), the guide sprocket (23), and the two drive sprockets (24) are connected by chain drive.

8. The warning strip cleaning device for renovation of construction guardrails according to claim 7, characterized in that, Both of the transmission sprockets (24) are rotatably mounted on the machine body (1) and are axially limited relative to the machine body (1). Two splined shafts (25) are rotatably mounted on the mounting base (3). The two splined shafts (25) are respectively inserted into the two transmission sprockets (24). Each transmission sprocket (24) is circumferentially driven and axially slidingly engaged with the corresponding splined shaft (25).

9. The warning strip cleaning device for renovation of construction guardrails according to claim 8, characterized in that, Each spline shaft (25) is provided with a bevel gear transmission assembly between it and the corresponding side grinding part (5). The bevel gear transmission assembly includes an input bevel gear (26) coaxially fixed on the corresponding spline shaft (25) and an output bevel gear (27) rotatably disposed on the corresponding movable arm (4). The input bevel gear (26) meshes with the output bevel gear (27), and the rotation axis of the output bevel gear (27) coincides with the rotation axis of the corresponding movable arm (4) relative to the mounting base (3).

10. The warning strip cleaning device for renovation of construction guardrails according to claim 9, characterized in that, Each of the side grinding parts (5) is rotatably mounted on the corresponding movable arm (4) via a rotating shaft. Each movable arm (4) is provided with a belt drive assembly, which includes a driving pulley (28) coaxially fixed with the corresponding output bevel gear (27), a driven pulley (29) coaxially fixed on the rotating shaft, and a drive belt (30) wound between the driving pulley (28) and the driven pulley (29).

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