Opposed fine boring equipment for cab floor support bearing hole of commercial vehicle

Abstract

The application relates to the technical field of boring device, in particular to an opposed type fine boring equipment for a bearing hole of a floor support of a commercial vehicle cab, which comprises a fine boring device and a cleaning assembly; the fine boring device comprises a machine table, a workbench arranged in the middle of the machine table, slide tables symmetrically and slidably arranged on the two sides of the machine table, a machine base fixed on the slide tables, a machine shaft rotatably arranged at the end of the machine base, and a cutter assembly mounted on the end of the machine shaft; the cleaning assembly is arranged on the inner side of the cutter assembly and is used for cleaning the bearing hole inner wall of iron filings after boring; the application further comprises a limiting assembly and a guide assembly. When the telescopic shaft is working outward, the arc-shaped lugs of the inner side abutting pieces touch the guide inclined surfaces of the rotating plates, the linkage connecting rods pull the limiting blocks to tightly hold the telescopic shaft, rigid mechanical limiting is formed, the workpiece hole bottom is prevented from being forcedly pressed by the scraper, the fine machining inner wall is prevented from being scratched, the finished product bearing hole is perfectly protected, when the telescopic shaft is retracted, the telescopic shaft is intermittently held to realize point braking, and the spring rebound kinetic energy is consumed.

Description

Technical Field

[0001] This application relates to the field of boring equipment technology, and in particular to a counter-type precision boring device for bearing holes of a commercial vehicle cab floor bracket. Background Technology

[0002] In the manufacturing of commercial vehicle cab floor supports, bearing holes serve as critical positioning and assembly reference surfaces. Their dimensional accuracy, roundness, and surface roughness directly affect the assembly quality of the cab and the overall vehicle driving safety. Currently, the industry typically uses opposed-type precision boring equipment to perform simultaneous precision boring on both sides of the bearing holes to ensure coaxiality and machining efficiency. For example, patent document CN119952100B discloses a continuous operation turning machine tool based on a rotary tool head switching structure. This application improves boring balance through a counterweight structure and uses elastic scrapers and brush structures to clean boring chips, thereby improving the boring quality to a certain extent.

[0003] However, this application also has the following defects: the cleaning scraper adopts a spring-push structure, and the extension stroke lacks rigid limit. The scraper is prone to excessively pressing the bottom of the workpiece hole due to centrifugal force or spring overshoot, scratching the inner wall of the precision machining. When retracting, the rebound potential energy accumulated by the spring is released instantaneously, causing the scraper to bounce and oscillate at high frequency, further aggravating the risk of scratching the hole wall. At the same time, the scraper and tool assembly also face the safety hazard of collision damage. In addition, the scraper extension and retraction movement lacks a reliable axial guide and damping buffer mechanism, and the radial offset and tilting eccentricity problems are prominent, aggravating the wear of the sliding pair and seriously affecting the long-term operating stability and machining consistency of the equipment. Therefore, a counter-type precision boring device for bearing holes of commercial vehicle cab floor bracket is proposed to solve the above problems. Summary of the Invention

[0004] Therefore, it is necessary to provide a counter-type precision boring machine with synchronous chip removal, effective limiting, and retraction buffer functions to address the aforementioned technical problems and solve the technical difficulties existing in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] An opposed-type precision boring device for bearing holes of a commercial vehicle cab floor bracket, comprising a precision boring device and a cleaning assembly;

[0007] The precision boring device includes a machine base, a worktable located in the middle of the machine base, slides symmetrically and slidably mounted on both sides of the machine base, a machine base fixed on the slides, a machine shaft rotatably located at the end of the machine base, and a tool assembly mounted on the end of the machine shaft; the cleaning assembly is mounted inside the tool assembly and is used to clean iron filings from the inner wall of the bearing hole after boring.

[0008] It also includes a limiting component and a guiding component; the limiting component and the guiding component are both integrated on the extension path of the cleaning component. The limiting component and the guiding component work together to form a dual constraint on the retraction movement of the cleaning component, thereby reducing and limiting the retraction stroke of the cleaning component and preventing the cleaning component from colliding with the tool assembly or workpiece due to overtravel.

[0009] Optional: The tool assembly includes a mounting plate, a docking shaft, two mounting seats, two sliding mouths, a tool, and an adjusting screw; the docking shaft is coaxially fixed to the end of the machine shaft, the mounting seats slide on the outside of the mounting plate, and the mounting plate is fixedly connected to the docking shaft.

[0010] Optionally: Two sliding openings are formed on the mounting plate, and the adjusting screw is rotatably mounted inside the mounting plate. Two mounting seats pass through the interior of the two sliding openings, and both mounting seats are threadedly connected to the adjusting screw. The cleaning assembly is slidably disposed inside one of the mounting seats.

[0011] Optionally: The cleaning assembly includes a scraper, a telescopic shaft, a limiting seat, a return spring, and a sealing seat; the telescopic shaft slides through the interior of one of the mounting seats, the sealing seat is sealed and assembled on the outer port of the mounting seat, the mounting seat connected to the cleaning assembly has an installation groove inside, and the limiting seat is fixed in the installation groove.

[0012] Optional: The scraper is fixed to the end of the telescopic shaft. The scraper extends along the telescopic shaft and scrapes off iron filings by fitting against the inner wall of the bearing hole. When retracting, it retracts and approaches the mounting seat. There are two return springs. One of the return springs is set outside the telescopic shaft and its two ends abut against the limiting seat and the telescopic shaft respectively. The other return spring abuts against the scraper and the sealing seat respectively.

[0013] Optional: The limiting component is disposed inside the mounting groove; it includes a support frame, a rotating plate, an abutment, and a limiting component; the support frame is fixed to the inner wall of the mounting groove, the support frame has a rotating opening, the rotating plate is elastically hinged and assembled in the rotating opening, and both ends of the rotating plate are provided with guide slopes; the limiting component has two abutments and two limiting components, and both abutments are fixed to the outside of the telescopic shaft, wherein the abutments and the two guide slopes are used in abutment cooperation; when the telescopic shaft extends outward, the abutment located on the inner side abuts against the guide slopes to drive the rotating plate to rotate, thereby driving the limiting component to hug and limit the telescopic shaft.

[0014] Optionally: The abutting component includes a sleeve, an adjusting rod, and an abutting plate. The abutting component is fixed to the outside of the telescopic shaft. The adjusting rod is adjustable and installed inside the sleeve. The abutting plate is fixed to the end of the adjusting rod, and the outside of the abutting plate is provided with an arc-shaped protrusion that abuts against the guide slope.

[0015] Optional: The two limiting members are respectively located on the left and right sides of the support frame. When the telescopic shaft retracts, the rotating plate is driven to rotate by the abutment member, and the limiting members contact to form the first mechanical limit. The limiting member includes a support plate, a limiting block and a guide rod. The support plate is fixed to the outside of the support frame. One end of the guide rod is fixed to the limiting block and passes through the inside of the support plate. The other end of the guide rod is hinged to the rotating plate. The inner side of the limiting block is embedded with an anti-slip pad that abuts against the telescopic shaft. A return spring 2 is installed between the limiting block and the support plate and surrounds the outside of the guide rod.

[0016] Optionally: The guide components are respectively disposed on the mounting groove and the sealing seat. The guide components include a guide seat, a guide wheel, a pressure booster, a through pipe, and a positioning frame. The guide seat is fixed to the outer surface of the telescopic shaft. The guide wheel is rotatably mounted on the inner side of the positioning frame, and a cam that contacts the pressure booster is fixed on the shaft of the guide wheel. Two three-way valve pipes are installed on the outer side of the pressure booster. The ends of the two three-way valve pipes are respectively connected to one of the abutment parts and the through pipe. When the telescopic shaft retracts, the outer side of the guide seat abuts against the guide wheel. The guide wheel guides and limits the telescopic shaft. At the same time, the cam drives the pressure booster to pressurize the abutment part and the through pipe. After the abutment part is pressurized, it drives the rotating plate to swing back and forth during displacement, thereby driving the limiting part to intermittently contact the telescopic shaft.

[0017] Optional: The guide seat has a recessed groove for use with the cam; the pressurizing component includes a cylinder, a piston and an abutment block, the piston is slidably disposed inside the cylinder, the abutment block extends out of the cylinder and fits the cam profile, and a nozzle that penetrates the inside of the sealing seat is fixed to the outside of the passage pipe. The pressurizing component is driven by the cam to pressurize the passage pipe, and the nozzle can spray gas to clean the telescopic shaft in conjunction with the scraping action of the sealing seat.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. In this invention, while the machine shaft drives the tool assembly to bore, a return spring continuously pushes the telescopic shaft to extend, and the scraper is always pressed against the inner wall of the bearing hole. It rotates synchronously with the tool to scrape off the iron chips generated during cutting in real time. This avoids iron chips remaining between the machining surface and the tool, squeezing and scraping the wall of the precision-machined hole, and stably ensuring the dimensional accuracy, roundness and surface roughness of the bearing hole, thus greatly reducing the scrap rate of the workpiece.

[0020] 2. In this invention, when the telescopic shaft is working outward, the arc-shaped protrusion of the inner abutment part touches the guide slope of the rotating plate, and the linkage pulls the limiting block to hug the telescopic shaft in the center, forming a rigid mechanical limit, which avoids the scraper forcibly pressing the bottom of the workpiece hole and scraping the precision-machined inner wall, perfectly protecting the finished bearing hole. When the telescopic shaft retracts, it can also perform high-frequency intermittent engagement to achieve point braking, consuming the spring rebound kinetic energy.

[0021] 3. In this invention, when the telescopic shaft retracts, the guide seat tightly adheres to the guide wheel for rolling constraint, limiting the telescopic shaft to retract only in a straight axial direction, completely eliminating radial offset and tilting eccentricity, preventing the telescopic shaft from scraping the inner hole of the mounting seat, reducing wear of the sliding pair, and preventing the scraper from scraping the tool assembly when retracting, reducing the risk of tool breakage; ensuring that the limit block is evenly engaged and subjected to force during subsequent intermittent braking, preventing unilateral wear.

[0022] 4. In this invention, when the telescopic shaft retracts, the guide seat drives the cam to continuously drive the pressurizing component to produce pulsating air pressure. The air pressure enters the sleeve and pushes the abutment plate to intermittently move the rotating plate, so that the limiting component repeatedly tightens and loosens the telescopic shaft at high frequency. Through multiple small-amplitude damping frictions, the spring rebound potential energy is gradually consumed. Unlike a single static hard limit, there is no instantaneous violent impact, which greatly reduces the fatigue wear of the mechanism.

[0023] 5. In this invention, the braking power is generated by the telescopic shaft itself retracting, which drives the cam to generate air pressure. The cam starts and stops synchronously with the retraction of the telescopic shaft. The faster the retraction speed, the higher the cam compression frequency. The braking damping strength is automatically matched with the rebound impact force, and it adapts to springs with different spring force specifications. Attached Figure Description

[0024] Figure 1 This is an overall schematic diagram of one embodiment;

[0025] Figure 2 This is a front view of the precision boring device in one embodiment;

[0026] Figure 3 This is a cross-sectional view of the tool assembly in one embodiment;

[0027] Figure 4 A cross-sectional view of the cleaning component in one embodiment;

[0028] Figure 5 This is a schematic diagram of the cleaning component and the limiting component in one embodiment;

[0029] Figure 6 This is a schematic diagram of the limiting component in one embodiment;

[0030] Figure 7 This is a schematic diagram of the abutment and guide assembly in one embodiment;

[0031] Figure 8 This is a cross-sectional view of the limiting member in one embodiment;

[0032] Figure 9 This is a cross-sectional view of the pressurization component in one embodiment.

[0033] Explanation of reference numerals in the attached drawings: 1. Precision boring device; 11. Machine base; 12. Worktable; 13. Slide table; 14. Machine base; 15. Machine spindle; 16. Tool assembly; 161. Mounting plate; 162. Connecting shaft; 163. Mounting seat; 164. Slide; 165. Tool; 166. Adjusting screw; 2. Cleaning assembly; 21. Mounting groove; 22. Scraper; 23. Telescopic shaft; 24. Limit seat; 25. Return spring 1; 26. Sealing seat; 3. Limiting assembly; 31. Support frame; 311. Rotating port; 32. Rotating plate; 321. Guide slope; 33. 331. Abutment component; 332. Sleeve; 333. Adjusting rod; 334. Abutment plate; 335. Arc-shaped protrusion; 346. Limiting component; 341. Support plate; 342. Limiting block; 343. Guide rod; 344. Anti-slip pad; 345. Connecting rod; 346. Reset spring II; 4. Guide assembly; 41. Guide seat; 411. Relief groove; 42. Guide wheel; 43. Pressurizing component; 431. Cylinder; 432. Piston; 433. Abutment block; 44. Three-way valve pipe; 441. Pipe body; 45. Through pipe; 451. Nozzle; 46. Positioning frame; 47. Cam. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0035] Example 1, such as Figure 1 and Figure 2 As shown, this embodiment provides a counter-type precision boring machine for bearing holes of a commercial vehicle cab floor bracket, including a precision boring device 1 and a cleaning assembly 2. The precision boring device 1, as the core processing unit, includes a fixed machine base 11, a worktable 12 centrally fixed to the surface of the machine base 11, two sets of slides 13 symmetrically slidably mounted on the left and right sides of the machine base 11, a machine base 14 bolted to the top of the slides 13, a machine shaft 15 rotatably mounted to the end of the machine base 14 via bearings, and a tool assembly 16 detachably mounted to the end of the machine shaft 15. The worktable 12 is used to position and clamp the commercial vehicle cab floor bracket workpiece to be processed. The double slide tables 13 can slide synchronously in opposite directions along the transverse slide rail of the machine table 11, driving the tool assemblies 16 on both sides to approach the workpiece, realizing the synchronous precision boring of the bearing hole on both sides, improving the processing efficiency and the coaxiality accuracy of the hole. It should be noted that the cleaning component 2 is embedded in the tool assembly 16 and rotates and extends synchronously with the boring tool. It is specifically used to clean the metal chips attached to the inner wall of the hole in real time after the bearing hole is bored, so as to avoid the residual metal chips affecting the precision of the finishing.

[0036] like Figure 3As shown, the tool assembly 16 serves as the boring execution structure, including a circular mounting plate 161, a coaxial docking shaft 162, two sets of symmetrically arranged mounting seats 163, two symmetrically opened sliding mouths 164, a carbide tool 165, and an adjusting screw 166. One end of the docking shaft 162 is coaxially locked and fixed to the end of the machine shaft 15, allowing it to rotate at high speed with the machine shaft 15. The other end of the docking shaft 162 is welded and fixed to the center of the mounting plate 161 to ensure overall rotational coaxiality. It should be noted that the two sliding mouths 164 are symmetrically opened through the surface of the mounting plate 161, and the adjusting screw 166 is horizontally rotated and mounted in the hollow cavity inside the mounting plate 161 via bearings. The adjusting screw 166 has positive and negative thread structures at both ends. Two sets of mounting seats 163 vertically penetrate the corresponding slides 164, and their bottoms are threadedly connected to the adjusting screw 166. By rotating the adjusting screw 166, the two mounting seats 163 can be driven to slide synchronously in opposite directions along the slides 164, precisely adjusting the machining radius of the tool 165, adapting to the boring of bearing holes with different diameters, and greatly improving the equipment's adaptability. Among them, the cleaning component 2 is slidably embedded inside the left mounting seat 163, realizing the cooperation between the chip cleaning structure and the boring tool structure.

[0037] Cleaning component 2 is a synchronous debris removal execution structure, such as... Figures 3-5 As shown, the assembly includes an arc-shaped scraper 22, a telescopic shaft 23, a limiting seat 24, two sets of return springs 25, and a sealing seat 26. The mounting base 163, which matches the cleaning component 2, has a cylindrical mounting groove 21 inside, providing installation space for the telescopic movement of the cleaning component 2 and the assembly of the limiting component 3. The telescopic shaft 23 slides vertically through the mounting base 163 and the mounting groove 21, allowing for linear telescopic movement along the axial direction. Specifically, the limiting seat 24 is bolted to the inside of the mounting groove 21, and the sealing seat 26 is sealed and locked onto the outer port of the mounting base 163, achieving a sealed protection for the mounting groove 21, preventing external iron filings and cutting fluid from entering the cavity, and avoiding jamming and wear of the sliding structure. An arc-shaped scraper 22 is fixedly installed at the outer end of the telescopic shaft 23. The arc of the scraper 22 matches the arc of the inner wall of the bearing hole, so it can fit against the hole wall. After the telescopic shaft 23 extends, it fits tightly against the hole wall and rotates synchronously to scrape off the cutting chips. When retracting, it automatically retracts and fits against the outer wall of the telescopic shaft 23, reducing the space occupied during retraction.

[0038] It should be noted that the two sets of return springs 25 adopt a segmented abutment assembly structure. The first set of return springs 25 is sleeved on the outside of the telescopic shaft 23, with its two ends abutting against the inner end face of the limiting seat 24 and the shoulder of the telescopic shaft 23, respectively, providing stable elastic force for the telescopic shaft 23 to extend outward. The two ends of the second set of return springs 25 abut against the inner end face of the scraper 22 and the outer end face of the sealing seat 26, respectively, assisting the scraper 22 to retract and reset, while buffering the impact of retraction. During the boring operation, the two sets of return springs 25 continuously output a stable pushing force, ensuring that the scraper 22 always adheres to the inner wall of the bearing hole, achieving real-time dynamic chip removal.

[0039] Example 2, as Figure 4 As shown, the mounting slot 21 is equipped with a limiting component 3 and a guide component 4 to limit and guide the telescopic shaft 23. Specifically, the limiting component 3 and the guide component 4 are both integrated on the telescopic movement path of the cleaning component 2. The two are linked and cooperate with each other to form a dual constraint mechanism, which precisely controls the entire extension and retraction stroke of the cleaning component 2, effectively reducing invalid strokes and achieving precise limiting. This completely avoids the problems of the cleaning component 2 extending beyond its stroke and pressing against the workpiece, or retracting beyond its stroke and colliding with the tool assembly 16 or the workpiece. The limiting component 3 is assembled inside the mounting slot 21 to provide the cleaning component 2 with stroke limiting and retraction braking buffer functions.

[0040] like Figures 4-8 As shown, the limiting component 3 includes a support frame 31, an elastically hinged rotating plate 32, two sets of abutment members 33, and two sets of limiting members 34. The support frame 31 is fixedly welded to the inner wall of the mounting groove 21. A rectangular rotating opening 311 is provided at the center of the support frame 31. The rotating plate 32 is elastically hinged inside the rotating opening 311 by a torsion spring, enabling bidirectional elastic rotation and automatic reset. Both the upper and lower ends of the rotating plate 32 are machined with inclined guide slopes 321 for contacting and transmitting force with the abutment members 33. Specifically, the two sets of abutment members 33 are symmetrically fixed to the outer axial surface of the telescopic shaft 23 and move synchronously with the telescopic shaft 23.

[0041] like Figure 6 and Figure 7 As shown, the abutment 33 includes a sleeve 331, an adjustable adjusting rod 332, and an arc-shaped abutment plate 333. The sleeve 331 is locked and fixed to the outer wall of the telescopic shaft 23. The adjusting rod 332 is threaded and adjustable inside the sleeve 331, and its extension length can be finely adjusted according to the telescopic stroke requirements to adapt to different stroke limit requirements. The abutment plate 333 is fixed to the outer end of the adjusting rod 332, and an arc-shaped protrusion 334 is integrally formed on the outer side. The arc-shaped protrusion 334 and the guide slope 321 are precisely fitted and slid, reducing the risk of transmission jamming. It should be noted that in the abutment 33 connected to the guide assembly 4, the adjusting rod 332 and the sleeve 331 slide together so that when the telescopic shaft 23 retracts, in conjunction with the guide assembly 4, the reciprocating lifting and lowering of the adjusting rod 332 can drive the rotating plate 32 to drive the limiting member 34 to intermittently contact the telescopic shaft 23.

[0042] like Figures 6-8As shown, two sets of limiting components 34 are symmetrically arranged on the left and right sides of the support frame 31, forming a bidirectional clamping limiting structure. Each set of limiting components 34 includes a support plate 341, a limiting block 342, a guide rod 343, a hinged connecting rod 345, and a return spring 346. The support plate 341 is horizontally fixed to the outside of the support frame 31. The guide rod 343 slides through the support plate 341. The inner end of the guide rod 343 is hinged to the side wall of the rotating plate 32 through the connecting rod 345, and the outer end is fixed to the limiting block 342. The inner side of the limiting block 342 is fitted with a rubber anti-slip pad 344, which can increase the frictional resistance with the telescopic shaft 23, improve the limiting stability, and at the same time avoid rigid clamping and wear on the shaft surface. The reset spring 346 is sleeved around the outside of the guide rod 343, with its two ends abutting against the support plate 341 and the limiting block 342 respectively, providing elastic driving force for the limiting block 342 to release and reset. Specifically, when the telescopic shaft 23 extends outward for chip removal, the arc-shaped protrusion 334 of the inner abutment 33 slides against the upper guide slope 321 of the rotating plate 32, driving the rotating plate 32 to deflect around the hinge point. Through the connecting rod 345, the guide rods 343 on both sides are pulled towards the center, causing the limiting block 342 to hug the telescopic shaft 23 inward, forming the first rigid mechanical limit, locking the maximum extension stroke, and preventing the scraper 22 from over-travel and pressing against the bottom of the workpiece hole, or scratching the wall of the precision-machined hole. When the telescopic shaft 23 retracts, the outer abutment 33, in conjunction with the guide assembly 4, intermittently moves the rotating plate 32 to swing back and forth, realizing the intermittent engagement and disengagement of the limiting block 342 with the telescopic shaft 23, forming a dynamic point braking buffer, and consuming the spring rebound potential energy.

[0043] like Figure 6 As shown, in this embodiment, the guide component 4 is integrated between the mounting groove 21 and the sealing seat 26, providing axial guidance, displacement pressurization, and mechanism self-cleaning functions for the telescopic movement of the telescopic shaft 23. Figure 6 , Figure 7 and Figure 9 As shown, the assembly includes a guide seat 41, a guide wheel 42, a pressure booster 43, two sets of three-way valve pipes 44, a connecting pipe 45, and a positioning frame 46. The guide seat 41 is fixedly mounted on the outer surface of the telescopic shaft 23 and moves synchronously with the telescopic shaft 23. An arc-shaped relief groove 411 is provided on the outer side of the guide seat 41 to accommodate the rotation of the cam 47. The positioning frame 46 is fixed to the inner wall of the mounting groove 21. The guide wheel 42 is rotatably mounted on the inner side of the positioning frame 46. A coaxial cam 47 is fixed to the end of the axle of the guide wheel 42. The cam 47 is in close contact with the end of the pressure booster 43 to achieve mechanical transmission pressure boosting.

[0044] like Figure 8 and Figure 9As shown, the pressurizing component 43 is fixed inside the cavity of the sealing seat 26, including a cylinder 431, a sealing piston 432, and an abutment block 433. The piston 432 is slidably fitted inside the cylinder 431, and the abutment block 433 extends out of the cylinder 431 and always fits against the contour surface of the cam 47. As the cam 47 rotates, it squeezes the piston 432 to reciprocate, generating pulsating air pressure inside the cylinder 431. Two sets of three-way valve pipes 44 are connected to the outside of the pressurizing component 43. Each set of three-way valve pipes 44 is connected to an independent pipe body 441. One set of pipe bodies 441 is connected to the inside of the sleeve 331 of the abutment component 33, and the other set of pipe bodies 441 is connected to the through pipe 45. The through pipe 45 is fixed inside the sealing seat 26 and extends to the outside of the sealing seat 26 and is equipped with a bidirectional nozzle 451. The nozzle 451 is divided into two spray ports, one obliquely aligned with the outer wall of the telescopic shaft 23 and the other aligned with the sealing lip inside the sealing seat 26. When the telescopic shaft 23 retracts, the outer wall of the guide seat 41 rolls tightly against the guide wheel 42, precisely constraining the telescopic shaft 23 to retract linearly along the axial direction, preventing radial offset and tilting eccentricity, and avoiding wear of the inner hole of the mounting seat 163 by the telescopic shaft 23 and scraping of the tool component 165 by the scraper 22. At the same time, the displacement of the guide seat 41 drives the guide wheel 42 and the cam 47 to rotate, continuously squeezing the pressurizing component 43 to generate pulsating air pressure. The air pressure is delivered to the abutment component 33 and the nozzle 451 respectively, simultaneously realizing dynamic point braking buffering and mechanism self-cleaning operation. It should be noted that there are three limiting components 3 and three guiding components 4. The three limiting components 3 and the three guiding components 4 are distributed in a ring at equal intervals. Except for the through pipe 45, the number of other structures in the three guiding components 4 is three. The three sets of guiding components 4 and the three sets of limiting components 3 correspond one-to-one and are integrated in a ring at equal intervals at the mounting groove 21 and the sealing seat 26. Together, they provide all-round axial guidance, displacement pressurization and mechanism self-cleaning function for the telescopic movement of the telescopic shaft 23, and further greatly improve the circumferential running stability of the cleaning component 2.

[0045] Working principle of this invention:

[0046] The spindle 15 drives the tool assembly 16 to rotate at high speed to perform boring. At this time, the elastic force of the return spring 25 drives the telescopic shaft 23 to slide outward along the mounting base 163. The scraper 22 fixed to the end of the telescopic shaft 23 is always pressed against the inner wall of the bearing hole under the action of the elastic force. As the tool assembly 16 rotates, the scraper 22 scrapes away iron chips from the surface that has just been boring in real time.

[0047] When the telescopic shaft 23 extends outward to the preset maximum working stroke, the arc-shaped protrusion 334 of the abutment member 33 located on the inner side of the telescopic shaft 23 touches the first guide slope 321 of the rotating plate 32, driving the rotating plate 32 to deflect. Through the connecting rod 345, the limiting block 342 of the limiting member 34 is pulled to hug the telescopic shaft 23 inward, forming a mechanical hard limit in the extension direction, so as to prevent the scraper 22 from damaging the inner wall of the workpiece due to centrifugal force or spring overshoot.

[0048] When the machining is finished or the tool needs to be retracted, the telescopic shaft 23 retracts into the mounting base 163 via the return spring 25. As the return spring 25 is further compressed during the retraction process, the accumulated rebound potential energy can easily cause the telescopic shaft 23 to generate high-frequency bouncing oscillation. At this time, the guide seat 41 on the outside of the telescopic shaft 23 is in close contact with the guide wheel 42 to ensure that it retracts in a straight line without radial offset.

[0049] During retraction, the guide seat 41 presses against the guide wheel 42, causing the cam 47 to rotate and drive the piston 432 of the booster 43 to reciprocate, generating pulsating air pressure. This air pressure is delivered to the sleeve 331 of the abutment 33 through the three-way valve pipe 44, pushing the adjusting rod 332 and the abutment plate 333 to expand outward, causing the abutment 33 to intermittently and repeatedly move the rotating plate 32 during the retraction displacement, thereby driving the limiting member 34 to perform high-frequency intermittent engagement with the telescopic shaft 23 to achieve point braking and consume the spring rebound kinetic energy. On the other hand, it is delivered to the nozzle 451 through the through pipe 45.

[0050] The pulsating air pressure generated by the booster 43 reaches the nozzle 451 through the pipe 45; the spray direction of the nozzle 451 is set to two branches: one branch sprays obliquely towards the outer wall of the telescopic shaft 23 to blow away the cutting fluid and metal powder that are carried out during the retraction; the other branch blows directly or obliquely towards the inner lip of the sealing seat 26 to blow away the iron filings and residues accumulated in the gap of the sealing seat 26 in the opposite direction, preventing the sealing seat 26 from wearing out due to particle accumulation, and at the same time assisting the scraper 22 to self-clean when it retracts.

Claims

1. A precision boring machine for opposing bearing holes in a commercial vehicle cab floor bracket, characterized in that: Includes a precision boring device (1) and a cleaning assembly (2); The precision boring device (1) includes a machine base (11), a worktable (12) located in the middle of the machine base (11), slides (13) symmetrically slidably mounted on both sides of the machine base (11), a base (14) fixed on the slides (13), a spindle (15) rotatably located at the end of the base (14), and a tool assembly (16) installed at the end of the spindle (15); the cleaning assembly (2) is mounted inside the tool assembly (16) and is used to clean the iron filings on the inner wall of the bearing hole after boring. It also includes a limiting component (3) and a guiding component (4); the limiting component (3) and the guiding component (4) are both integrated and arranged on the extension path of the cleaning component (2). The limiting component (3) and the guiding component (4) work together to form a double constraint on the retraction movement of the cleaning component (2), thereby reducing and limiting the retraction stroke of the cleaning component (2) and preventing the cleaning component (2) from colliding with the tool assembly (16) or the workpiece due to overtravel.

2. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 1, characterized in that: The tool assembly (16) includes a mounting plate (161), a docking shaft (162), two mounting seats (163), two sliding ports (164), a tool (165), and an adjusting screw (166); the docking shaft (162) is coaxially fixed to the end of the machine shaft (15), the mounting seat (163) slides on the outside of the mounting plate (161), and the mounting plate (161) is fixedly connected to the docking shaft (162).

3. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 2, characterized in that: Two sliding openings (164) are opened on the mounting plate (161), and the adjusting screw (166) is rotatably installed inside the mounting plate (161). Two mounting seats (163) pass through the interior of the two sliding openings (164) respectively, and both mounting seats (163) are threadedly connected to the adjusting screw (166). The cleaning component (2) is slidably disposed inside one of the mounting seats (163).

4. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 1, characterized in that: The cleaning assembly (2) includes a scraper (22), a telescopic shaft (23), a limiting seat (24), a return spring (25), and a sealing seat (26); the telescopic shaft (23) slides through the interior of one of the mounting seats (163), the sealing seat (26) is sealed and assembled on the outer port of the mounting seat (163), the mounting seat (163) connected to the cleaning assembly (2) has an installation groove (21) inside, and the limiting seat (24) is fixed in the installation groove (21).

5. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 4, characterized in that: The scraper (22) is fixed to the end of the telescopic shaft (23). The scraper (22) extends out along the telescopic shaft (23) to scrape off iron filings from the inner wall of the bearing hole. When it retracts, it closes to the mounting seat (163). There are two return springs (25). One of the return springs (25) is sleeved on the outside of the telescopic shaft (23) and its two ends abut against the limiting seat (24) and the telescopic shaft (23) respectively. The other return spring (25) abuts against the scraper (22) and the sealing seat (26) respectively.

6. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 4, characterized in that: The limiting component (3) is disposed inside the mounting groove (21); it includes a support frame (31), a rotating plate (32), an abutment (33), and a limiting component (34); the support frame (31) is fixed to the inner wall of the mounting groove (21), the support frame (31) has a rotating opening (311), the rotating plate (32) is elastically hinged and assembled in the rotating opening (311), and both ends of the rotating plate (32) are provided with guide slopes (321); the limiting component (3) There are two abutting parts (33) and two limiting parts (34) in each part. Both abutting parts (33) are fixed on the outside of the telescopic shaft (23). The abutting parts (33) are used in conjunction with the two guide slopes (321). When the telescopic shaft (23) extends outward, the abutting parts (33) located on the inside abut against the guide slopes (321) to drive the rotating plate (32) to rotate, thereby driving the limiting parts (34) to hug and limit the telescopic shaft (23).

7. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 6, characterized in that: The abutment (33) includes a sleeve (331), an adjusting rod (332) and an abutment plate (333). The abutment (33) is fixed to the outside of the telescopic shaft (23). The adjusting rod (332) is adjustablely installed inside the sleeve (331). The abutment plate (333) is fixed to the end of the adjusting rod (332). The abutment plate (333) has an arc-shaped protrusion (334) on the outside that abuts against the guide slope (321).

8. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 6, characterized in that: Two limiting members (34) are respectively disposed on the left and right sides of the support frame (31). When the telescopic shaft (23) retracts, it drives the rotating plate (32) to rotate through the abutment member (33), and the limiting members (34) contact to form the first mechanical limit. The limiting member (34) includes a support plate (341), a limiting block (342), and a guide rod (343). The support plate (341) is fixed to the outside of the support frame (31), and the guide rod (343) is... One end is fixed to the limiting block (342), and the guide rod (343) passes through the inside of the support plate (341). The other end of the guide rod (343) is hinged to the rotating plate (32) with a connecting rod (345). The inner side of the limiting block (342) is provided with an anti-slip pad (344) that abuts against the telescopic shaft (23). A second return spring (346) is installed between the limiting block (342) and the support plate (341) and surrounds the outside of the guide rod (343).

9. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 6, characterized in that: The guide assembly (4) is respectively disposed on the mounting groove (21) and the sealing seat (26). The guide assembly (4) includes a guide seat (41), a guide wheel (42), a pressure booster (43), a through pipe (45), and a positioning frame (46). The guide seat (41) is fixed to the outer surface of the telescopic shaft (23). The guide wheel (42) is rotatably mounted on the inner side of the positioning frame (46), and a cam (47) that contacts the pressure booster (43) is fixed on the shaft of the guide wheel (42). Two three-way valve pipes (44) are installed on the outer side of the pressure booster (43). The valve pipe (44) has a pipe body (441) that is connected to one of the abutment parts (33) and the through pipe (45) respectively. When the telescopic shaft (23) retracts, the outer side of the guide seat (41) abuts against the guide wheel (42). The guide wheel (42) guides and limits the telescopic shaft (23). At the same time, the cam (47) drives the pressurizing part (43) to pressurize the abutment part (33) and the through pipe (45). After the abutment part (33) is pressurized, it drives the rotating plate (32) to swing back and forth when it is displaced, thereby driving the limiting part (34) to intermittently contact the telescopic shaft (23).

10. The opposed-type precision boring equipment for bearing holes of a commercial vehicle cab floor bracket according to claim 9, characterized in that: The guide seat (41) has a recessed groove (411) for use with the cam (47) inside; the pressurizing component (43) includes a cylinder (431), a piston (432) and an abutment block (433). The piston (432) is slidably disposed inside the cylinder (431). The abutment block (433) extends out of the cylinder (431) and fits the contour of the cam (47). A nozzle (451) is fixed on the outside of the through pipe (45) and penetrates the inside of the sealing seat (26). The pressurizing component (43) is driven by the cam (47) to pressurize the through pipe (45). The nozzle (451) can spray gas and, in conjunction with the scraping of the sealing seat (26), clean the telescopic shaft (23).

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