Boring and limiting device for diesel engine camshaft hole

Abstract

The application discloses a boring and aligning limiting device for camshaft holes of a diesel engine and relates to the field of internal combustion engine machining.The device comprises a device body, a diesel engine cylinder is placed on the device body, and a supporting cylinder, an adjusting frame, a stud, a fixing lug and a nut are arranged on the device body.A supporting plate is mounted on the outer wall of the adjusting frame, a spring one is mounted on the top of the supporting plate, and a movable plate is arranged on the top of the spring one and is slidably connected with the stud and rotatably connected with the fixing lug.The device can simultaneously release the locking of the fixing block and the fixing groove and the locking of the protrusion teeth of the clamping ring and the positioning ring by rotating and pressing the unlocking rod, the height and the angle can be simultaneously limited and unlocked, the tool adjusting steps during the replacement of diesel engine cylinders of various specifications are simplified, the time consumption for debugging before workpiece machining is reduced, the overall boring and aligning efficiency is improved, and the problems of complicated and labor-consuming adjustment operation of the traditional device are solved.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine machining, specifically to a boring limit device for a diesel engine camshaft bore. Background Technology

[0002] The machining accuracy of the camshaft bore in a diesel engine cylinder block directly affects the coaxiality of the camshaft assembly and the smooth operation of the valve train, making it a key process in engine cylinder block machining. During the boring process, a boring bar and a limiting device are needed to reliably clamp and position the cylinder block to avoid deviations in bore diameter and roundness caused by cutting vibration. For example, the cylinder block tooling limiting structure used in conjunction with CNC machining centers is widely used in diesel engine cylinder block camshaft bore boring production lines.

[0003] The existing diesel engine camshaft bore boring limit device mainly consists of a tooling base, multiple sets of support columns, fixed ears, and adjusting nut assemblies. The fixed ears are used to abut against the top surface of the diesel engine cylinder block to achieve positional constraint during cylinder block machining. At the same time, one or more sets of adjusting nuts are installed at the bottom of the fixed ears. By rotating the bottom nut, the support height of the fixed ears can be changed to complete the height position adjustment. After the height is adjusted to the correct position, the fixed ear angle is rotated and then the locking nut at the top of the fixed ear is tightened to complete the locking and positioning. This device can adapt to the limit point positioning requirements of various diesel engine cylinder blocks and is a commonly used limit adjustment structure in the camshaft bore boring process.

[0004] However, before each batch and specification of cylinder block is processed, the height of the limiting device needs to be adjusted by turning the bottom nut of the fixing lug according to the shape of the cylinder block. Since the bottom nut of the corresponding fixing lug needs to be turned one by one during the adjustment process, the entire adjustment process is cumbersome and time-consuming. This results in poor convenience of fixing lug height adjustment, prolongs the tooling debugging time of the workpiece, reduces the overall processing cycle of the boring equipment, and is not conducive to efficient and continuous boring of the camshaft hole of the diesel engine cylinder block. Summary of the Invention

[0005] The purpose of this invention is to provide a boring limit device for a diesel engine camshaft bore to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a boring limit device for a diesel engine camshaft hole, comprising a device body, on which a diesel engine cylinder is placed, and a support cylinder, an adjusting frame, a stud, a fixing lug, and a nut are provided on the device body. A support plate is installed on the outer wall of the adjusting frame, and a spring is installed on the top of the support plate. The top of the spring is provided with a movable plate that is slidably connected to the stud and rotatably connected to the fixing lug. A torsion spring adapted to the fixing lug is provided on the movable plate. The adjusting frame and the support cylinder are fixed by a positioner, and the positioner includes a transmission frame and a fixing block that are slidably installed in the adjusting frame and connected to each other, and multiple sets of fixing grooves that cooperate with the fixing block are opened on the inner wall of the support cylinder. The adjusting frame is provided with a hydraulic mechanism that cooperates with the transmission frame to control the position of the fixing block. The top of the movable plate is rotatably mounted with an interconnected angle limiting block and a positioning ring, and the angle limiting block is in contact with the side wall of the fixed ear to limit the angle of rotation of the angle limiting block under the action of the torsion spring. The movable plate is equipped with an interconnected retaining ring and a spring, and the top of the retaining ring and the bottom of the angle limiting block are provided with mutually compatible protruding teeth. The top of the fixed ear is rotatably mounted with a guide wheel, and the top of the support plate is mounted with a limiting bracket that works in conjunction with the guide wheel. The adjustment frame is equipped with an unlocker, which works in conjunction with a hydraulic mechanism to pull the fixing block out of the fixing groove, and works in conjunction with a retaining ring to release the restriction on the positioning ring.

[0007] Preferably, the fixing ear is located at the top of the movable plate, and when the movable plate moves down to its limit, it is in contact with the top of the adjusting frame, and the top diameter of the adjusting frame is greater than the diameter of the stud.

[0008] Preferably, the guide wheel is rotatably mounted on the top side of the fixed ear near the limit frame, and the top bottom surface of the limit frame is designed to be inclined towards the stud, so as to cooperate with the guide wheel to swing the fixed ear away from the diesel engine cylinder block. When the fixed ear moves up to a stationary state following the movable plate, the guide wheel is in contact with the outer wall of the limiting frame near the stud. After the fixed ear moves down with the movable plate and is offset from the limiting frame, it will swing under the action of the torsion spring until it is in contact with the limiting block.

[0009] Preferably, a positioning seat is installed on the top of the movable plate to limit the extreme position of the angle adjustment of the angle limiting block; The positioning ring and the retaining ring are provided with multiple sets of protruding teeth at equal angles, and the outer diameter of the retaining ring is smaller than the outer diameter of the positioning ring, so as to ensure that the positioning ring will not move down synchronously after the retaining ring moves down. Multiple sets of springs are arranged at equal angles on the movable plate, and each set of springs is in contact with the retaining ring to push the retaining ring up to a state in contact with the positioning ring.

[0010] Preferably, the transmission frame has multiple sets of fixed blocks arranged at equal angles on the adjusting frame, and multiple sets of fixed blocks are evenly installed on the outer wall of the transmission frame.

[0011] Preferably, the hydraulic mechanism includes an oil storage tank and an oil delivery tank opened in the adjustment frame, and a piston 1 slidably installed in the oil storage tank and connected to the unlocker, with a spring 2 installed at the bottom of the piston 1 that is in contact with the bottom surface of the oil storage tank. The top of the oil delivery tank is connected to the oil storage tank, and the bottom is slidably mounted with a piston two that is fixedly connected to the transmission frame. The connection position between the oil delivery tank and the oil storage tank is located above the piston one.

[0012] Preferably, the unlocking device includes an unlocking rod movably mounted on the adjusting frame and rotatably connected to the piston, a knob is mounted on the top of the unlocking rod, and an unlocking groove adapted to the knob is formed on the top surface of the stud.

[0013] Preferably, the unlocker further includes a support frame installed on the inner wall of the retaining ring and a pressure block installed on the outer wall of the unlocking rod. The support frame is provided with a relief ring corresponding to the pressure block in the middle, which is used to prevent the relief ring from contacting the pressure block during the lifting and lowering movement of the retaining ring following the movable plate. The inner wall of the clearance ring is equipped with a transmission seat that matches the pressure block. When the knob is misaligned with the unlocking slot, the pressure block is misaligned with the transmission seat. When the knob is rotated to correspond to the unlocking slot position, the pressure block rotates to the top of the transmission seat to ensure that the transmission seat is squeezed by the pressure block when the unlocking rod moves down.

[0014] Preferably, the bottom surface of the knob is rotatably mounted with a ball bearing that contacts the top surface of the stud, and the corners of the knob and the opening corners of the unlocking slot are chamfered.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the unlocking device set in the adjustment frame, in conjunction with the hydraulic mechanism and the retaining ring, can simultaneously release the locking of the fixed block and the fixed groove, and the engagement locking of the retaining ring and the positioning ring by rotating and pressing down the unlocking rod. It eliminates the need to adjust the height by turning the nuts one by one, and can simultaneously unlock the height and angle limits. This simplifies the tooling adjustment steps when changing various specifications of diesel engine cylinder blocks, reduces the time spent on pre-processing debugging of the workpiece, improves the overall processing efficiency of the boring bar, and solves the problem of cumbersome and laborious adjustment operations of traditional devices.

[0016] 2. This invention utilizes the cooperation between the guide wheel at the top of the fixed ear and the limiting frame on the support plate. After the movable plate moves down, the guide wheel disengages from the limiting frame, and the fixed ear swings and adheres to the limiting block under the action of the torsion spring to achieve swing angle limitation. When tightening the nut, the fixed ear automatically swings to the limiting point of the diesel engine cylinder block. After the boring is completed and the nut is loosened, the spring drives the movable plate to move up, the guide wheel re-adheres to the limiting frame, and the fixed ear automatically swings away from the diesel engine cylinder block. There is no need for manual adjustment of the fixed ear, which facilitates the loading and unloading of the diesel engine cylinder block and reduces the intensity of manual operation.

[0017] 3. This invention improves the stability of the adjusting frame after locking by arranging multiple sets of transmission frames at equal angles inside the adjusting frame, and setting multiple sets of fixing blocks on the outer wall of each set of transmission frames. The multiple sets of fixing blocks are simultaneously inserted into the fixing grooves on the inner wall of the support cylinder. The positioning ring and the retaining ring are both equipped with multiple sets of mutually matching protruding teeth, and multiple sets of springs push the retaining ring upward to ensure the fixation of the angle of the limiting block and the certainty of the swing angle of the fixing ear under the action of the torsion spring.

[0018] 4. This invention, through the top knob of the unlocking rod, the unlocking groove on the top surface of the stud, the ball bearing on the bottom surface of the knob, and the chamfered structure of the knob and the unlocking groove, reduces friction of the ball bearing when the knob rotates, and the chamfer makes it easy for the knob to be aligned and embedded in the unlocking groove, making the unlocking operation smooth and effortless; the avoidance ring on the support frame can prevent the pressure block from contacting and interfering with the support frame when the movable plate is raised and lowered, and the components cooperate without jamming. The hydraulic mechanism relies on spring two to achieve automatic reset. After the unlocking rod is released, the fixing block and the retaining ring can automatically lock, without the need for additional locking operation. The overall structure is stable and easy to use and maintain. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of a partial part of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the part after a side section; Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle; Figure 5 For the present invention Figure 3 A magnified structural diagram of point B in the middle; Figure 6 This is a structural schematic diagram of the support plate, movable plate, and other components of the present invention; Figure 7 For the present invention Figure 6 A schematic diagram of the structure of the disassembled components; Figure 8 This is a schematic diagram of the structure of the positioning ring, retaining ring, unlocking rod, and other components of the present invention; Figure 9 This is a schematic diagram of the positioning ring and retaining ring of the present invention; Figure 10 This is a schematic diagram of the structure of the fixed ear of the present invention when it is not in use.

[0020] In the diagram: 1. Device body; 10. Diesel engine cylinder block; 2. Support cylinder; 3. Adjusting frame; 31. Support plate; 32. Movable plate; 33. Spring 1; 4. Stud; 5. Fixing lug; 51. Guide wheel; 52. Limiting frame; 6. Nut; 7. Transmission frame; 71. Fixing block; 72. Fixing groove; 73. Oil reservoir; 74. Piston 1; 75. Spring 2; 76. Oil delivery groove; 77. Piston 2; 8. Angle limit block; 80. Positioning seat; 81. Positioning ring; 82. Snap ring; 83. Spring 3; 9. Unlocking rod; 91. Knob; 92. Unlocking groove; 93. Support frame; 94. Pressure block; 95. Clearance ring; 96. Transmission seat. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-10 The present invention provides the following technical solution: a boring limit device for a diesel engine camshaft hole, comprising a device body 1, on which a diesel engine cylinder block 10 is placed, and a support cylinder 2, an adjusting frame 3, a stud 4, a fixing lug 5, and a nut 6 are assembled; a support plate 31 is fixed to the outer wall of the adjusting frame 3, a spring 33 is installed on the top of the support plate 31, and a movable plate 32 is arranged at the top of the spring 33. The movable plate 32 is slidably engaged with the stud 4 and rotatably connected to the fixing lug 5, and a torsion spring matching the fixing lug 5 is built into the movable plate 32; the adjusting frame 3 and the support cylinder 2 are locked and fixed by a positioner, the positioner comprising a transmission frame 7 slidably disposed inside the adjusting frame 3 and fixedly connected to each other and a fixing block 71, and multiple sets of connections to the fixing block 71 are provided on the inner wall of the support cylinder 2. The adjusting frame 3 has a matching fixed groove 72 and an internal hydraulic mechanism to drive the transmission frame 7 to control the extension and retraction of the fixed block 71. The top of the movable plate 32 is rotatably equipped with a mutually connected limiting block 8 and positioning ring 81. The side wall of the limiting block 8 is attached to the fixing ear 5 to limit the rotation angle of the lower limiting block 8 driven by the torsion spring. The movable plate 32 is equipped with a retaining ring 82 and a spring 83. The top surface of the retaining ring 82 and the bottom surface of the limiting block 8 are provided with interlocking protrusions. The top of the fixing ear 5 is rotatably mounted with a guide wheel 51. The upper part of the support plate 31 is fixed with a limiting frame 52 for the guide wheel 51. The adjusting frame 3 is equipped with an unlocker. The unlocker is synchronously linked with the hydraulic mechanism and the retaining ring 82 to simultaneously release the height lock of the adjusting frame 3 and the angle lock of the limiting block 8.

[0023] In a preferred embodiment of the present invention, the fixed ear 5 is arranged at the top of the movable plate 32. When the movable plate 32 moves down to the limit position, the bottom surface is in contact with the top surface of the adjusting frame 3, and the outer diameter of the top of the adjusting frame 3 is larger than the outer diameter of the stud 4, which can form a stable support limit for the movable plate 32 and prevent the movable plate 32 from sliding down and shifting excessively.

[0024] In a preferred embodiment of the present invention, the guide wheel 51 is rotatably mounted on the top of the fixed ear 5 near the limit frame 52. The top bottom surface of the limit frame 52 is inclined towards the stud 4. The inclined structure can cooperate with the guide wheel 51 to push the fixed ear 5 to swing away from the diesel engine cylinder block 10. When the movable plate 32 drives the fixed ear 5 to move up to a stable state, the guide wheel 51 is close to the outer wall of the limit frame 52 near the stud 4. After the movable plate 32 drives the fixed ear 5 to move down until the guide wheel 51 is completely misaligned with the limit frame 52, the fixed ear 5 automatically rotates under the torque drive of the built-in torsion spring until the side wall is in contact with the angle limiting block 8 to complete the angle limiting.

[0025] In a preferred embodiment of the present invention, a positioning seat 80 is fixed at the top of the movable plate 32. The positioning seat 80 is used to limit the extreme rotation angle of the angle limiting block 8. Multiple sets of meshing protrusions are arranged at equal angles along the circumference on the surfaces of the positioning ring 81 and the retaining ring 82. The outer diameter of the retaining ring 82 is smaller than the outer diameter of the positioning ring 81. When the retaining ring 82 is pressed down to disengage, it will not drive the positioning ring 81 to move down synchronously. Multiple sets of springs 83 are arranged at equal angles along the circumference inside the movable plate 32. The top of all springs 83 abuts against the retaining ring 82. Under normal conditions, the retaining ring 82 is pushed upward and engaged with the protrusions of the positioning ring 81 to lock it, thus restricting the rotation of the positioning ring 81 and the angle limiting block 8.

[0026] As a preferred embodiment of the present invention, multiple sets of transmission frames 7 are assembled inside the adjustment frame 3 along the circumference at equal angles. Multiple fixing blocks 71 are evenly fixed on the outer wall of a single transmission frame 7. The multiple sets of fixing blocks 71 are synchronously inserted into the fixing grooves 72 on the inner wall of the support cylinder 2, thereby locking the structural rigidity of the adjustment frame 3 after lifting and positioning at multiple points.

[0027] As a preferred embodiment of the present invention, the hydraulic mechanism includes an oil storage tank 73 and an oil delivery tank 76 opened inside the adjustment frame 3. A piston 74 is slidably assembled inside the oil storage tank 73. The piston 74 is connected to the unlocker. A spring 75 is installed at the bottom of the piston 74. The bottom end of the spring 75 is in close contact with the bottom surface of the oil storage tank 73. The top of the oil delivery tank 76 is connected to the oil storage tank 73, with the connection point located above the piston 74. The bottom of the oil delivery tank 76 is slidably fitted with the piston 77, which is fixedly connected to the transmission frame 7. Pressing down the unlocking device causes the piston 74 to move down and compress the spring 75. As the space above the oil storage tank 73 of the piston 74 increases, the hydraulic oil in the oil delivery tank 76 is drawn into the oil storage tank 73, thereby pulling the piston 77 back. Simultaneously, the transmission frame 7 retracts the fixing block 71 to release the lock. After releasing the unlocking device, the spring 75 rebounds and pushes the piston 74 to reset. The hydraulic oil flows back and pushes the piston 77 to extend outward. The fixing block 71 re-engages into the fixing groove 72 to lock the height.

[0028] In a preferred embodiment of the present invention, the unlocking device includes an unlocking rod 9 movably mounted on the adjusting frame 3. The bottom end of the unlocking rod 9 is rotatably connected to the piston 74. A knob 91 is fixed to the top end of the unlocking rod 9. An unlocking groove 92 matching the shape of the knob 91 is opened on the top surface of the stud 4. When the knob 91 is turned into the unlocking groove 92, it can restrict the circumferential rotation of the unlocking rod 9, ensuring that the pressure block 94 is smoothly aligned with the transmission seat 96 when the unlocking rod 9 is pressed down. After the knob 91 is turned out of the unlocking groove 92, the unlocking rod 9 can rotate freely to achieve reset.

[0029] As a preferred embodiment of the present invention, the unlocker further includes a support frame 93 fixed to the inner wall of the retaining ring 82 and a pressure block 94 integrally installed on the outer wall of the unlocking rod 9; an avoidance ring 95 is fixed in the middle of the support frame 93, the inner diameter of the avoidance ring 95 is larger than the outer diameter of the pressure block 94, and the avoidance ring 95 and the pressure block 94 do not interfere with each other during the lifting and lowering of the movable plate 32, and no scraping or jamming will occur. The inner wall of the clearance ring 95 is fixed with the transmission seat 96 that matches the pressure block 94; when the knob 91 and the unlocking groove 92 are misaligned and separated, the pressure block 94 and the transmission seat 96 are radially misaligned, and the pressing unlocking rod 9 cannot squeeze the retaining ring 82; after the knob 91 is rotated and inserted into the unlocking groove 92, the pressure block 94 rotates synchronously to the top of the transmission seat 96, and when the pressing unlocking rod 9 is pressed down, the pressure block 94 presses down vertically on the transmission seat 96, which drives the support frame 93 and the retaining ring 82 to move down and compress the spring 83, thus releasing the angle lock of the positioning ring 81.

[0030] In a preferred embodiment of the present invention, the bottom surface of the knob 91 is fitted with a ball bearing, the bottom surface of which is in contact with the top surface of the stud 4. During the rotation of the knob 91, the ball bearing reduces friction, making the operation smooth and effortless. The corners of the knob 91 and the opening corners of the unlocking groove 92 are all chamfered. The chamfered structure can guide the knob 91 to quickly align and embed into the unlocking groove 92, reducing the difficulty of the alignment operation.

[0031] Working principle: Under normal adjustment and standby conditions, the top knob 91 of the unlocking rod 9 and the unlocking groove 92 on the top surface of the stud 4 are misaligned. The outer wall pressure block 94 of the unlocking rod 9 and the transmission seat 96 on the support frame 93 are misaligned and separated. The second spring 75 in the hydraulic mechanism pushes the first piston 74 upward. The hydraulic oil in the oil reservoir 73 flows back to the upper part of the oil reservoir 73. The second piston 77 is in the state of pushing the transmission frame 7. Multiple sets of transmission frames 7 drive the fixing block 71 to be fully embedded in the corresponding fixing groove 72 on the inner wall of the support cylinder 2. The adjusting frame 3 and the support cylinder 2 are radially locked, and the overall height is fixed. Meanwhile, in this state, the movable plate 32 is kept in a high position under the upward pushing action of the spring 33. The top guide wheel 51 of the fixed ear 5 is close to the side wall of the limit frame 52. The side wall of the limit frame 52 constrains the guide wheel 51, so that the fixed ear 5 is in a state of overcoming the internal torsion spring force and opening outward, away from the diesel engine cylinder 10. At the same time, the multiple sets of springs 83 inside the movable plate 32 are in a state of pushing the retaining ring 82 upward. The retaining ring 82 is engaged and locked with the bottom protrusion of the positioning ring 81. The angle of the limiting block 8 is fixed, so that the positioning ring 81 and the limiting block 8 no longer rotate, and the limiting angle remains unchanged. When it is necessary to replace the diesel engine cylinder block 10 of different specifications and adjust the overall height of the adjusting bracket 3, first tighten the nut 6. As the nut 6 moves down, it pushes the fixing ear 5 to move down synchronously. As the fixing ear 5 moves down, the guide wheel 51 at the top of it separates from the limit bracket 52, thereby releasing the restriction that the limit bracket 52 imposed on the fixing ear 5. At this time, the fixing ear 5 swings outward under the action of the torsion spring until its side wall is in contact with the outer wall of the corner block 8. At this time, the angle of the fixing ear 5 is restricted. During the downward movement of the fixed ear 5, it will push the movable plate 32 to move downward simultaneously and compress the spring 33, so that the spring 33 is in a compressed state until the bottom surface of the movable plate 32 is in contact with the top surface of the adjusting frame 3. At this time, the height of the fixed ear 5 is limited, but the nut 6 is not fully tightened at this time, and the fixed ear 5 can change its angle. Then rotate the top knob 91 of the unlocking lever 9 so that the knob 91 is aligned with the unlocking groove 92 on the top surface of the stud 4. During the rotation of the knob 91, it will drive the unlocking lever 9 to rotate synchronously, and the unlocking lever 9 will drive the pressure block 94 to rotate synchronously until the knob 91 is aligned with the unlocking groove 92. At this time, the pressure block 94 will rotate to the top of the transmission seat 96. Next, the unlocking lever 9 is pressed down to slide downwards. During the pressing process, the unlocking lever 9 will simultaneously drive the piston 1 74 to compress the spring 2 75 downwards, so that the hydraulic oil in the oil supply tank 76 is drawn into the oil storage tank 73, and the piston 2 77 slides into the oil supply tank 76. During this process, the piston 2 77 will pull multiple sets of fixing blocks 71 and fixing grooves 72 through the transmission frame 7, releasing the radial lock between the fixing blocks 71 and fixing grooves 72 on the adjusting frame 3 and the support cylinder 2. Then the adjusting frame 3 can slide freely up and down along the support cylinder 2, flexibly adjusting the height of the fixing ear 5 according to the size of the diesel engine cylinder 10, and quickly completing the overall height adjustment to adapt to the height of different specifications of diesel engine cylinder 10. Simultaneously, as the unlocking lever 9 moves down, the pressure block 94 on its outer wall will squeeze the transmission seat 96, and simultaneously drive the support frame 93 and the retaining ring 82 to compress the spring 83 downward, causing the meshing teeth of the retaining ring 82 and the positioning ring 81 to separate from each other. At this time, the angle lock of the positioning ring 81 and the limiting block 8 is also released simultaneously, and the limiting angle can be freely rotated and adjusted. The position of the limiting block 8 can be flexibly adjusted according to the different outer edge limiting points of the diesel engine cylinder 10, ensuring that after the fixing ear 5 and the limiting block 8 are attached, they can smoothly contact the limiting point of the diesel engine cylinder 10. In actual adjustment, first adjust the angle of the fixing ear 5, and then manually adjust the position of the limiting block 8. In this state, the fixing ear 5 is in contact with the limiting block 8 under the action of the torsion spring. Then, the user can use a tool to fully tighten the fixing ear 5 to ensure the fixation of the fixing ear 5. Then adjust the height of the fixed ear 5 up and down. After the height is adjusted to the correct position, release the pressing unlocking rod 9. At this time, the spring 2 75 rebounds and pushes the piston 1 74 to reset, so that the hydraulic oil flows back. The piston 2 77 resets and drives the transmission frame 7 to push the fixed block 71 back into the corresponding fixed groove 72 of the support cylinder 2, thus completing the height locking of the adjustment frame 3. At the same time, the spring 83 pushes the retaining ring 82 upward to reset, and the retaining ring 82 re-engages with the convex teeth of the positioning ring 81, locking the rotation angle of the limiting angle block 8. Finally, the knob 91 is rotated again to make it misalign with the unlocking groove 92, causing the pressure block 94 to separate from the transmission seat 96, thus completing the reset operation. Before boring, tighten nut 6 to compress spring 33 downward and move it down simultaneously. During this process, the top guide wheel 51 of the fixed ear 5 slides down the inclined surface of the limit frame 52 until the guide wheel 51 is completely free from the constraint of the limit frame 52. The fixed ear 5 swings rapidly under the torque of the torsion spring until the side wall is in contact with the corner block 8 to complete the positioning. At this time, the fixed ear 5 is located above the limit point of the diesel engine cylinder block 10. As the nut 6 is further tightened, the fixed ear 5 will squeeze the limit point of the diesel engine cylinder block 10, thereby restricting the up and down movement of the diesel engine cylinder block 10 during machining. After boring is completed, loosen nut 6. At this time, spring 33 rebounds and pushes movable plate 32 upward. Guide wheel 51 re-contacts the inclined surface of limit frame 52. Guided by the inclined surface of limit frame 52 and the upward force given by spring 33, guide wheel 51 overcomes the torsion spring force and reverses, so that fixed ear 5 separates from diesel engine cylinder 10 and realizes automatic swing of fixed ear 5, which facilitates subsequent loading and unloading of diesel engine cylinder 10. This device can complete both height and angle adjustment at once, eliminating the tedious operation of adjusting the height by turning the nuts 6 one by one with traditional tooling. At the same time, relying on the cooperation of the guide wheel 51 and the limit frame 52, the fixed ear 5 automatically swings to the limit point above the diesel engine cylinder block 10 during processing and automatically swings to a state that is offset from the diesel engine cylinder block 10 after processing, which greatly shortens the tooling debugging time of the diesel engine cylinder block 10 and improves the cycle time of camshaft hole boring.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A boring bar limiting device for a diesel engine camshaft bore, comprising a device body (1), characterized in that: The device body (1) is equipped with a diesel engine cylinder (10), and the device body (1) is provided with a support cylinder (2), an adjustment frame (3), a stud (4), a fixing ear (5) and a nut (6). The outer wall of the adjustment frame (3) is equipped with a support plate (31), and a spring (33) is installed on the top of the support plate (31). The top of the spring (33) is provided with a movable plate (32) that is slidably connected to the stud (4) and rotatably connected to the fixing ear (5). The movable plate (32) is provided with a torsion spring that is adapted to the fixing ear (5). The adjusting frame (3) is fixed to the support cylinder (2) by a positioner. The positioner includes a transmission frame (7) and a fixing block (71) that are slidably installed in the adjusting frame (3) and connected to each other, and multiple sets of fixing grooves (72) that cooperate with the fixing block (71) are opened on the inner wall of the support cylinder (2). The adjusting frame (3) is provided with a hydraulic mechanism that cooperates with the transmission frame (7) to control the position of the fixing block (71). The top of the movable plate (32) is rotatably mounted with a limiting block (8) and a positioning ring (81) connected to each other, and the limiting block (8) is in contact with the side wall of the fixed ear (5) to limit the angle of rotation of the limiting block (8) under the action of the torsion spring. The movable plate (32) is equipped with a retaining ring (82) and a spring three (83) connected to each other, and the top of the retaining ring (82) and the bottom of the limiting block (8) are provided with mutually compatible protruding teeth. The top of the fixed ear (5) is rotatably mounted with a guide wheel (51), and the top of the support plate (31) is mounted with a limiting frame (52) that works in conjunction with the guide wheel (51). The adjustment frame (3) is equipped with an unlocker. The unlocker works in conjunction with the hydraulic mechanism to pull the fixing block (71) out of the fixing groove (72) and works in conjunction with the retaining ring (82) to release the restriction on the positioning ring (81).

2. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The fixed ear (5) is located on the top of the movable plate (32), and when the movable plate (32) moves down to its limit, it is in contact with the top of the adjusting frame (3), and the top diameter of the adjusting frame (3) is greater than the diameter of the stud (4).

3. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The guide wheel (51) is rotatably mounted on the top of the fixed ear (5) near the limit frame (52), and the top bottom surface of the limit frame (52) is designed to be inclined towards the stud (4), which is used to cooperate with the guide wheel (51) to swing the fixed ear (5) away from the diesel engine cylinder (10). When the fixed ear (5) moves upward to a stationary state along with the movable plate (32), the guide wheel (51) is in contact with the outer wall of the limiting frame (52) near the stud (4); The fixed ear (5) moves down with the movable plate (32) until it is offset from the limit frame (52), and then swings under the action of the torsion spring until it is in contact with the corner block (8).

4. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The top of the movable plate (32) is equipped with a positioning seat (80) to limit the extreme position of the angle limit block (8) for adjusting the angle; The positioning ring (81) and the retaining ring (82) are provided with multiple sets of protruding teeth at equal angles, and the outer diameter of the retaining ring (82) is smaller than the outer diameter of the positioning ring (81) to ensure that the positioning ring (81) will not move down synchronously after the retaining ring (82) moves down. Multiple sets of springs (83) are arranged at equal angles on the movable plate (32). All sets of springs (83) are in contact with the retaining ring (82) to push the retaining ring (82) to a state in contact with the positioning ring (81).

5. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The transmission frame (7) has multiple sets of fixed blocks (71) installed at equal angles on the adjustment frame (3), and the outer wall of the transmission frame (7) is uniformly equipped with multiple sets of fixed blocks (71).

6. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The hydraulic mechanism includes an oil reservoir (73) and an oil delivery tank (76) opened in the adjustment frame (3), and a piston (74) slidably installed in the oil reservoir (73) and connected to the unlocker. A spring (75) is installed at the bottom of the piston (74) and is in contact with the bottom surface of the oil reservoir (73). The top of the oil delivery tank (76) is connected to the oil storage tank (73), and the bottom is slidably installed with a piston two (77) that is fixedly connected to the transmission frame (7). The connection position between the oil delivery tank (76) and the oil storage tank (73) is located above the piston one (74).

7. The boring bar limiting device for a diesel engine camshaft hole according to claim 1, characterized in that: The unlocker includes an unlocking rod (9) movably mounted on the adjusting frame (3) and rotatably connected to the piston (74). A knob (91) is mounted on the top of the unlocking rod (9), and an unlocking groove (92) adapted to the knob (91) is opened on the top surface of the stud (4).

8. The boring bar limiting device for a diesel engine camshaft hole according to claim 7, characterized in that: The unlocker also includes a support frame (93) installed on the inner wall of the retaining ring (82) and a pressure block (94) installed on the outer wall of the unlocking rod (9). The support frame (93) has a relief ring (95) corresponding to the pressure block (94) installed in the middle, which is used to prevent the relief ring (95) from contacting the pressure block (94) during the lifting and lowering movement of the retaining ring (82) following the movable plate (32). The inner wall of the avoidance ring (95) is equipped with a transmission seat (96) that is compatible with the pressure block (94). When the knob (91) is misaligned with the unlocking groove (92), the pressure block (94) is misaligned with the transmission seat (96). When the knob (91) is rotated to correspond to the position of the unlocking groove (92), the pressure block (94) rotates to the top of the transmission seat (96) to ensure that the unlocking rod (9) will press the transmission seat (96) through the pressure block (94) when it moves down.

9. The boring bar limiting device for a diesel engine camshaft hole according to claim 8, characterized in that: The bottom surface of the knob (91) is rotatably mounted with a ball bearing that is in contact with the top surface of the stud (4), and the corners of the knob (91) and the opening corners of the unlocking groove (92) are all chamfered.

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