A device for fine grinding the inner wall of a compression cylinder

Abstract

The application provides a compression cylinder cylinder body inner wall fine grinding device, and belongs to the technical field of grinding equipment. The compression cylinder cylinder body inner wall fine grinding device comprises a machine body and a lifting seat. The lifting seat is slidably installed on the machine body. A cutter bar is installed on the lifting seat. A plurality of installation blocks that can slide in the radial direction are arranged in an annular array on the cutter bar. An oil stone is arranged on the installation block. A sliding frame is rotatably arranged on the lifting seat. A rib that penetrates the cutter bar is arranged on the sliding frame. A wedge-shaped piece is installed on the rib. A wedge-shaped strip corresponding to the rib is arranged on the wedge-shaped piece. A stop block is arranged on the installation block. The installation block and the stop block are connected through a first elastic piece. By arranging the cutter expansion unit, the depth of the honing lines at both ends of the cylinder body can be increased. By arranging the compensation unit, the angle of the honing lines at both ends of the cylinder body can be adjusted, so that the oil storage capacity at both ends of the cylinder body can be increased, and the sealing performance of the cylinder body can be improved.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding equipment, specifically relating to a precision grinding device for the inner wall of a compression cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a cushioning device, and a venting device.

[0003] Chinese patent CN117884964B discloses a precision grinding device for the inner wall of a hydraulic cylinder, including a worktable and a worktable loading turntable assembly. The worktable loading turntable assembly is rotatably mounted on the upper end of the worktable, and several cylinder floating base assemblies are fixedly mounted on the upper surface of the worktable loading turntable assembly. This invention allows the cylinder to be processed to be placed on the cylinder floating base assembly by opening the movable sealing plate. The cylinder can be placed one by one by rotating the worktable loading turntable assembly. After closing the movable sealing plate, the diameter of the precision grinding assembly is adjusted, and then the air shaft motor is started to drive the precision grinding assembly to rotate. Then, the lifting cylinder is started to push the precision grinding assembly into the cylinder. The cylinder floating base assembly can move in the vertical direction. During grinding, it can reduce the impact caused by the instantaneous friction between the grinding head and the inner wall of the cylinder during axial movement, thus protecting the cylinder and the precision grinding assembly.

[0004] When precision grinding a compression cylinder, the inner wall of the cylinder needs to be honed to store a small amount of engine oil, forming a lubricating film and reducing friction and wear. However, the aforementioned document does not mention that the inner wall of the cylinder can be honed. Even if it were possible to hon the cylinder, the shape of the honed pattern would be too uniform and could not be processed according to the honed patterns of different stroke areas of the compression cylinder inner wall, resulting in easy wear of the piston and reduced piston life. Summary of the Invention

[0005] The purpose of this invention is to provide a precision grinding device for the inner wall of a compression cylinder, which aims to solve the problem that existing precision grinding devices for the inner wall of hydraulic cylinders cannot process the honing marks in different stroke areas of the inner wall of the cylinder, resulting in easy wear of the piston and reduced piston service life.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision grinding device for the inner wall of a compression cylinder, comprising: a machine body and a lifting seat, the lifting seat being mounted on the machine body and capable of sliding up and down on the machine body, a tool holder being mounted on the lifting seat, mounting blocks being arranged in a circular array on the tool holder, the mounting blocks being capable of sliding radially within the tool holder, an oilstone being provided on the mounting blocks, a sliding frame being rotatably mounted on the lifting seat, the sliding frame being provided with ribs penetrating the upper and lower ends of the tool holder, wedge-shaped elements being mounted on the ribs, and wedge-shaped elements being provided with... The wedge-shaped strip corresponding to the rib has a stop block on the mounting block. The mounting block and the stop block are connected by a first elastic element. The lifting seat has a transfer shaft. The transfer shaft slides up and down on the lifting seat through a telescopic element. The tool bar is connected to the transfer shaft. When the transfer shaft drives the tool bar to move up and down, the wedge-shaped strip can move inside the tool bar and abut against the stop block. The inclined surface of the wedge-shaped strip pushes the stop block towards the inner wall of the cylinder, thereby increasing the pressure of the honing stone on the inner wall of the cylinder and increasing the depth of the honing texture.

[0007] A further technical solution of the present invention is that the tool bar is provided with a through groove extending along the axis of the tool bar. The through groove has space for the rib to move. When the tool bar rotates, it can drive the abutment to move, so that the abutment is misaligned with the wedge.

[0008] A further technical solution of the present invention is that a rotating shaft connected to an adapter shaft is provided in the middle of the tool bar, the rotating shaft can drive the tool bar to rotate, a limiting disk is fixedly connected to one end of the rotating shaft inside the tool bar, and a second elastic element is provided on the tool bar to center the limiting disk inside the tool bar.

[0009] A further technical solution of the present invention is that the telescopic end of the telescopic member is provided with a lifting ring, and the lifting ring rotates on the adapter shaft.

[0010] A further technical solution of the present invention is that the wedge-shaped member is slidably disposed on the rib, and the wedge-shaped member can be fixed on the rib by screws.

[0011] A further technical solution of the present invention is that the lifting seat is provided with a top screw, which abuts against the sliding frame to increase the friction force when the sliding frame rotates.

[0012] A further technical solution of the present invention is that a driving component is installed on the lifting seat, and a polygonal sliding groove is provided at the axis of the adapter shaft. The output end of the driving component can slide inside the sliding groove and drive the adapter shaft to rotate.

[0013] A further technical solution of the present invention is that there are two wedge-shaped members, which are respectively disposed at both ends of the rib, and the knife bar is located between the two wedge-shaped members, and the inclined end of the wedge-shaped bar is facing the knife bar.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] By setting up a honing unit, the depth of the honing marks at both ends of the cylinder can be increased. By setting up a compensation unit, the angle of the honing marks at both ends of the cylinder can be adjusted, thereby increasing the oil storage capacity at both ends of the cylinder and improving the sealing performance of the cylinder. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0018] Figure 2 This is an isometric sectional view of a specific embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the blade body in a specific embodiment of the present invention;

[0020] Figure 4 This is an isometric sectional view of the cutter body in a specific embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the installation structure of the wedge-shaped component in a specific embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the expansion blade unit in a specific embodiment of the present invention;

[0023] Figure 7 for Figure 2 Enlarged structural diagram at point A;

[0024] Figure 8 for Figure 6 Enlarged schematic diagram of the structure at point B.

[0025] In the diagram: 1. Machine body; 11. Fixed platform; 12. Lifting structure; 2. Lifting seat; 21. Drive component; 22. Adapter shaft; 23. Slide groove; 24. Telescopic component; 25. Lifting ring; 26. Set screw; 3. Blade body; 31. Blade bar; 311. Through groove; 32. Mounting block; 33. Oilstone; 34. Abutment block; 35. First elastic component; 36. Rotating shaft; 361. Limiting plate; 37. Second elastic component; 4. Blade expansion unit; 41. Sliding frame; 42. Rib; 43. Wedge-shaped component; 431. Wedge-shaped strip; 5. Compensation unit; 6. Compression cylinder. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-8 The present invention provides the following technical solution: a precision grinding device for the inner wall of a compression cylinder, comprising a body 1, a lifting seat 2, a blade 3, a blade expansion unit 4, and a compensation unit 5.

[0028] The lifting seat 2 is mounted on the machine body 1, and the blade 3 is mounted on the lifting seat 2, enabling the lifting seat 2 to move the blade 3 up and down. The blade expansion unit 4 is mounted on the blade 3, which can control the diameter of the blade 3 to change slightly. The compensation unit 5 can compensate for the up and down movement of the blade 3. By fixing the compression cylinder 6 on the fixed platform 11 of the machine body 1 and fixing it with a clamp, the lifting seat 2 moves the blade 3 downward, so that the blade 3 enters the inner wall of the compression cylinder 6 to grind the inner wall of the compression cylinder 6. During the process, the grinding pressure at both ends of the compression cylinder 6 can be increased by the blade expansion unit 4, thereby increasing the depth of the honing pattern, improving the oil storage capacity at both ends of the honing pattern, and improving the lubrication effect. The compensation unit 5 reduces the lifting speed of the blade body 3 when it moves to the positions at both ends of the compression cylinder 6, thereby changing the ratio of the lifting speed and rotation speed of the blade body 3, and thus changing the honing pattern angle at both ends of the inner wall of the compression cylinder 6, making the honing pattern angle at both ends of the compression cylinder 6 larger, increasing the oil storage capacity, and also improving the sealing performance.

[0029] Please see Figure 1 The machine body 1 includes a fixed platform 11, which can slide horizontally on the machine body 1. The compression cylinder 6 is fixed on the fixed platform 11 by a clamp. The machine body 1 is provided with a lifting structure 12, which is connected to the lifting seat 2 and can drive the lifting seat 2 to slide up and down on the machine body 1. The lifting structure 12 can be a hydraulic cylinder or a screw and sleeve structure.

[0030] Please see Figure 2 and Figure 7 A drive unit 21, which is a motor, is installed on the lifting base 2. Its output end is connected to an adapter shaft 22 for driving the adapter shaft 22 to rotate. The output end of the adapter shaft 22 away from the drive unit 21 is coaxially connected to the tool body 3. A slide groove 23 is provided at the axis of the adapter shaft 22 (see [reference]). Figure 7The cross-section of the slide 23 is polygonal, and the cross-section of the output end of the drive component 21 is also polygonal, so that the drive component 21 can drive the adapter shaft 22 to rotate during operation, and at the same time, the adapter shaft 22 drives the cutter body 3 to rotate. Telescopic components 24 are provided on both sides of the lifting seat 2. The telescopic component 24 is an electric telescopic cylinder or a hydraulic cylinder. Its fixed end is fixed on the lifting seat 2. The telescopic end of the telescopic component 24 is fixedly connected to the lifting ring 25. The lifting ring 25 rotates on the adapter shaft 22, and the vertical movement of the lifting ring 25 relative to the adapter shaft 22 is limited by the slot. The telescopic component 24 can drive the lifting ring 25 to move up and down, without affecting the rotation of the adapter shaft 22.

[0031] Please see Figure 3 and Figure 4 The cutter body 3 includes a cutter bar 31, which is cylindrical. Mounting blocks 32 are arranged in a ring array on the cutter bar 31. The mounting blocks 32 can slide radially inside the cutter bar 31. An oilstone 33 is detachably mounted on the mounting blocks 32. The oilstone 33 contacts the inner wall of the compression cylinder 6. When the adapter shaft 22 drives the cutter body 3 to rotate, the oilstone 33 can polish the inner wall of the compression cylinder 6.

[0032] Please see Figures 4-6 The blade lifting unit 4 includes a sliding frame 41, the top of which is rotatably mounted on the lifting seat 2 (e.g., Figure 7As shown), the sliding frame 41 is limited to slide up and down relative to the lifting seat 2 by setting a slot. The tool bar 31 is mounted on the sliding frame 41 and can slide up and down on the sliding frame 41. The sliding frame 41 is cylindrical and coaxially arranged with the tool bar 31. The sliding frame 41 includes multiple ribs 42 located at one end of the sliding frame 41. The ribs 42 extend in the length direction of the sliding frame 41. The tool bar 31 slides on the ribs 42. Two wedge-shaped pieces 43 are detachably arranged on the ribs 42. The wedge-shaped pieces 43 are detachably fixed to the ribs 42 by screws. Each of the two wedge-shaped pieces 43 is provided with a wedge-shaped strip 431. There are multiple wedge-shaped strips 431, which correspond to the ribs 42. The inclined end of the wedge-shaped strip 431 faces the tool bar 31. The inclined end near the tool bar 31 is close to the axis of the tool bar 31. The distance between the two ends is less than the distance between the other end and the tool bar 31, and the tool bar 31 is positioned between the two wedges 43. A through groove 311 is provided on the tool bar 31, which runs through the axis of the tool bar 31. The wedge 431 passes through the through groove 311 and enters the interior of the tool bar 31. A stop block 34 is provided on the side of the mounting block 32 away from the whetstone 33. A first elastic element 35 is provided between the stop block 34 and the mounting block 32. The first elastic element 35 is a spring sheet that pushes the stop block 34 away from the mounting block 32. In order to improve the stability of the stop block 34, a groove is provided inside the mounting block 32. The stop block 34 slides inside the groove, so that the mounting block 32 can only slide in the direction away from and towards the mounting block 32. When the tool bar 31 slides on the rib 42, the wedge 431 can abut against the stop block 34.

[0033] In use, firstly, the inner hole of the compression cylinder 6 is aligned with the cutter bar 31 via the fixed platform 11. Then, the lifting seat 2 moves downward, extending the cutter bar 31 into the compression cylinder 6. Next, the positions of the two wedges 43 are adjusted so that they are located at the top and bottom of the compression cylinder 6, respectively, allowing them to be adjusted according to the stroke of the compression cylinder 6. After adjustment, the wedges 43 are fixed to the ribs 42 with screws. Then, the adapter shaft 22 drives the cutter bar 31 to rotate, and simultaneously, the telescopic member 24 drives the cutter bar 31 to move upward. When the cutter bar 31 reaches contact with the upper wedge 431, it is close to the top of the compression cylinder 6. The cutter bar 31 continues to move upward, causing the wedge 431 to push the inclined surface against the abutment block 34, which in turn presses against the first elastic member 35. The first elastic member 35 then pushes the mounting block 32, causing the whetstone 33 to press against the inner wall of the compression cylinder 6, thereby increasing... The pressure of the oil stone 33 on the inner wall of the cylinder can slightly increase the depth of the honing groove, improve the oil storage capacity of the honing groove, and also improve the sealing performance, avoiding the problem of gas leakage caused by excessive pressure at the top of the compression cylinder 6 during use. When the cutter bar 31 moves in the reverse direction, the abutment block 34 can be disengaged from the wedge strip 431, and the first elastic element 35 can no longer apply pressure to the mounting block 32. At this time, the honing groove is shallower. This position is in the middle of the piston stroke. Compared with the upper region, the piston speed in the middle stroke is higher, which makes it easier to form a hydrodynamic lubrication film. Therefore, reducing the depth of the honing groove can reduce frictional resistance and oil film shear loss, and reduce frictional power consumption. When the cutter bar 31 continues to move downward, the abutment block 34 contacts the bottom wedge strip 431. Through the above principle, the depth of the bottom honing groove can also be increased. Since the piston frequently changes direction at the bottom, the deeper honing groove increases the oil storage capacity and improves the smoothness of piston reversal.

[0034] Please see Figure 3 and Figure 6 The wedge-shaped bar 431 is located on one side of the abutment block 34 and is offset from the abutment block 34. The through groove 311 has space for the rib 42 to move, so that when the tool holder 31 rotates, the rib 42 can be slightly displaced inside the through groove 311. By rotating the tool holder 31 in both directions, the wedge-shaped bar 431 and the abutment block 34 can be made to overlap or offset from each other. In order to prevent the sliding frame 41 from rotating with the tool holder 31 when the rib 42 moves inside the through groove 311, a set screw 26 is provided on the lifting seat 2 (see [link]). Figure 7 The set screw 26 abuts against the sliding frame 41 to increase the friction when the sliding frame 41 rotates, so that when the tool bar 31 is driven to rotate by the rotating shaft 36, the sliding frame 41 is prevented from rotating with the tool bar 31. After the rib 42 moves into place in the through groove 311, the sliding frame 41 is driven to rotate by the side of the through groove 311 against the rib 42, thus avoiding the situation where the rib 42 does not move into place in the through groove 311.

[0035] In use, because the honing stone 33 increases the pressure at both ends of the compression cylinder 6 to increase the depth of the honing marks, the increased pressure of the honing stone 33 can easily cause the ends of the compression cylinder 6 to develop a flared shape. Therefore, when grinding the ends of the compression cylinder 6, it is necessary to first leave a small machining allowance on the inner wall of the compression cylinder 6, and then perform the first grinding on the inner wall of the compression cylinder 6. This first grinding, through the forward rotation of the tool holder 31, makes the depth of the honing marks at both ends of the compression cylinder 6 deeper than the depth in the middle area. At this point, the ends of the compression cylinder 6 may develop a flared shape. Then, the tool holder 31 is reversed, causing the rib 42 to move a certain distance inside the through groove 311, thus misaligning the wedge 431 with the abutment 34. After that, the tool holder 31 drives the whetstone 33 to perform a second grinding on the inner wall of the cylinder. Since the wedge 431 and the abutment 34 are misaligned, the first elastic element 35 will not apply pressure to the mounting block 32 during the grinding process. As a result, during the second grinding, the whetstone 33 is almost unaffected by the pressure of the first elastic element 35. Therefore, the position of the whetstone 33 remains unchanged, thus making the diameter of the middle part of the compression cylinder 6 consistent with the diameter of the ends of the compression cylinder 6, thereby avoiding the formation of a flared shape.

[0036] Please see Figure 4 The compensation unit 5 includes a rotating shaft 36 disposed in the middle of the tool holder 31. The top of the rotating shaft 36 is connected to the adapter shaft 22. This connection can be fixed by a coupling or flange, so that the rotating shaft 36 and the adapter shaft 22 are coaxially fixed, allowing the adapter shaft 22 to drive the rotating shaft 36 to rotate. The rotating shaft 36 extends into the interior of the tool holder 31, allowing the tool holder 31 to slide along the axis of the rotating shaft 36. The cross-section of the rotating shaft 36 is rectangular, and the top of the tool holder 31 is provided with a fitting that is compatible with the rotating shaft 36. The rectangular groove is through which the rotating shaft 36 passes through the interior and exterior of the tool holder 31, so that the rotating shaft 36 can drive the tool holder 31 to rotate when it rotates. The end of the rotating shaft 36 located inside the tool holder 31 is fixedly connected to the limiting disk 361. Inside the tool holder 31, there is a second elastic member 37 that centers the limiting disk 361 inside the tool holder 31. There are two second elastic members 37 located on both sides of the limiting disk 361. The ends of the two second elastic members 37 away from the limiting disk 361 abut against the inner walls of the upper and lower ends of the tool holder 31.

[0037] In use, the inner wall of the compression cylinder 6 can be ground by the rotation of the tool holder 31. When the tool holder 31 moves upward and the wedge 431 abuts against the stop block 34, the pressure between the oilstone 33 and the inner wall of the compression cylinder 6 is increased by the first elastic element 35. At the same time, the friction between the oilstone 33 and the inner wall of the compression cylinder 6 also increases. Therefore, when the rotating shaft 36 moves upward, the increased friction between the oilstone 33 and the inner wall of the compression cylinder 6 causes the second elastic element 37 located above the limit plate 361 to be compressed, thereby slowing down the upward movement speed of the tool holder 31. The ratio of the upward movement speed to the rotational speed changes, thereby altering the honing groove angle. This increases the honing groove angle, further enhancing the oil storage capacity of the groove, improving lubrication and sealing. When the tool holder 31 moves downward to the middle position of the compression cylinder 6, the honing groove angle decreases due to the disengagement of the wedge strip 431 from the abutment block 34. This reduces the frictional force driving the middle of the compression cylinder 6. Meanwhile, the honing groove angle in the lower region of the compression cylinder 6 increases again through the above principle, improving the high oil storage capacity of the honing groove driven at the bottom of the compression cylinder 6 and enhancing the smoothness of piston reversal.

Claims

1. A device for precision grinding of the inner wall of a compression cylinder, comprising: The machine body (1) and the lifting seat (2), wherein the lifting seat (2) is slidably mounted on the machine body (1), characterized in that: A tool bar (31) is installed on the lifting seat (2). Multiple mounting blocks (32) that can slide radially are arranged in a circular array on the tool bar (31). An oilstone (33) is installed on the mounting block (32). A sliding frame (41) is rotatably mounted on the lifting seat (2). A rib (42) that passes through the knife bar (31) is mounted on the sliding frame (41). A wedge (43) is mounted on the rib (42). A wedge (431) corresponding to the rib (42) is mounted on the wedge (43). The mounting block (32) is provided with a stop block (34), and the mounting block (32) and the stop block (34) are connected by a first elastic member (35); The lifting seat (2) is provided with a connecting shaft (22), which is slidably connected to the lifting seat (2) through a telescopic member (24), and the knife bar (31) is detachably connected to the connecting shaft (22); When the adapter shaft (22) drives the tool holder (31) to move up and down, the wedge (431) can move inside the tool holder (31) and make the wedge (431) abut against the block (34). The wedge (431) pushes the block (34) towards the inner wall of the cylinder through the inclined surface of the wedge (431), thereby increasing the pressure of the honing stone (33) on the inner wall of the cylinder and increasing the depth of the honing marks. The tool bar (31) is provided with a through groove (311) that runs through the axis of the tool bar (31). The through groove (311) has space for the rib (42) to move. When the tool bar (31) rotates, it can drive the abutment (34) to move, so that the abutment (34) is misaligned with the wedge (431). The tool bar (31) is provided with a rotating shaft (36) connected to the adapter shaft (22) in the middle. The rotating shaft (36) can drive the tool bar (31) to rotate. One end of the rotating shaft (36) located inside the tool bar (31) is fixedly connected to a limiting disk (361). A second elastic element (37) is provided on the tool bar (31) to make the limiting disk (361) centered inside the tool bar (31).

2. The precision grinding device for the inner wall of a compression cylinder according to claim 1, characterized in that: The telescopic end of the telescopic component (24) is provided with a lifting ring (25), which is rotatably mounted on the adapter shaft (22).

3. The precision grinding device for the inner wall of a compression cylinder according to claim 1, characterized in that: The wedge (43) is slidably disposed on the rib (42) and can be fixed on the rib (42) by screws.

4. The precision grinding device for the inner wall of a compression cylinder according to claim 1, characterized in that: The lifting seat (2) is provided with a top screw (26), which abuts against the sliding frame (41) to increase the friction force when the sliding frame (41) rotates.

5. The precision grinding device for the inner wall of a compression cylinder according to claim 2, characterized in that: The lifting seat (2) is equipped with a drive unit (21), and a polygonal sliding groove (23) is provided at the center of the adapter shaft (22). The output end of the drive unit (21) can slide inside the sliding groove (23) and drive the adapter shaft (22) to rotate.

6. The precision grinding device for the inner wall of a compression cylinder according to claim 1, characterized in that: There are two wedges (43), which are respectively set at both ends of the rib (42). The knife bar (31) is located between the two wedges (43), and the inclined end of the wedge (431) faces the knife bar (31).

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