Quick disassembly device and method for grinding machine tips used for cross pin machining

Abstract

A quick-disassembly device and method for a grinding machine center for machining crosshead pins. The quick-disassembly device is inserted between the large end face of the grinding machine center and the sleeve end face of the center sleeve, and includes a bow frame, a drive screw, a shift shaft, a push shaft, a washer, a screw, a swing support seat, and two wedges. The rotation of the drive screw pushes the shift shaft downward along the vertical hole of the bow frame. The shift shaft pushes the push shaft inward along the horizontal hole of the bow frame by sliding against each other on contact inclined surfaces. The bow frame, screw, and swing support seat then apply inward force to the two wedges inserted between the grinding machine center and the center sleeve, and the grinding machine center is removed from the center sleeve by the action of the wedge surfaces. The present invention realizes the quick and safe removal of the grinding machine center from the center sleeve, achieving the effects of improving working efficiency, reducing labor intensity, and ensuring the safety of machine tool accessories and personnel. It has the advantages of simple structure, low cost, and convenient operation, and is suitable for the removal of the grinding machine center in the grinding process of crosshead pins of marine diesel engines.

Description

Technical Field

[0001] The invention relates to a processing technology for large low-speed diesel engine parts, in particular to a quick disassembly device and method for a grinding machine tip for cross pin machining, belonging to the technical field of diesel engine machining. Background Art

[0002] The cross pin is one of the most important parts in high-power, low-speed marine diesel engines. It is installed in the bearing hole of the connecting rod through the bearing shell. Figure 1 The cross pin 10 is composed of a large outer circle 101 and small outer circles 102 at both ends. It is a large cylindrical workpiece. Taking the 8G95MEC cross pin of a large marine diesel engine as an example, its maximum diameter is 980mm, the total height is 1464mm, and the weight is about 5.5 tons. During the operation of the marine diesel engine, the contact between the large outer circle 101 of the cross pin 10 and the bearing shell is sliding friction. The working conditions are poor and an oil film must be established to ensure that it is not damaged. If the roundness deviation of the large outer circle 101 exceeds 0.015 mm, it will cause the bearing shell and the large outer circle 101 to fit poorly. This means that the established oil film is unstable, which will cause the cross pin 10 to stick to the bearing shell, reducing the reliability of the diesel engine operation. Therefore, the large outer circle 101 must be ground and finished.

[0003] The cross pin 10 is generally clamped on the grinding machine with two ends of the center during grinding. In order to improve the system rigidity of the cross pin 10 during grinding and improve the roundness of the large outer circle 101, please refer to Figure 2 , usually the distance between the big head end face 91 of the grinding machine top 10 and the sleeve end face 201 of the top sleeve 20 is shortened; when the grinding machine top 9 needs to be removed from the top sleeve 20, a wedge is inserted between the big head end face 91 and the sleeve end face 201, and then the side end of the wedge is struck with a hammer to convert the horizontal hammering force into a vertical force along the axis of the top sleeve 20 and the grinding machine top 9, thereby separating the grinding machine top 9 from the top sleeve 20.

[0004] However, this disassembly method by manual knocking, on the one hand, requires multiple changes of positions due to unilateral force, and the operation can only be completed after multiple knocking. On the other hand, careless knocking operation can easily damage the grinder top 9 and the sleeve end face 201. Therefore, the existing disassembly method is inefficient, labor-intensive, and easy to damage the grinder top and the top sleeve, making it difficult to meet production requirements. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a quick disassembly device and method for the grinding machine center for cross pin processing, so as to realize the quick and safe disassembly of the grinding machine center from the center sleeve, thereby achieving the effect of improving working efficiency, reducing labor intensity and ensuring the safety of machine tool accessories and personnel.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] A quick-disassembly device for a grinding machine center for machining cross pins, inserted between the end face of the large head of the grinding machine center and the end face of the sleeve of the center sleeve, characterized in that the quick-disassembly device comprises a bow frame, a drive screw, a shift shaft, a push shaft, a washer, a screw, a swing support seat and two wedges;

[0008] The bow-shaped frame is arranged horizontally, with an inward-facing resting surface on one side and a cross-shaped horizontal hole and a vertical hole on the other side;

[0009] The shift shaft is arranged at the lower part of the vertical hole, and the lower end is an inclined surface and extends into the horizontal hole, the inclined surface facing the inner side of the bow frame, and the driving screw is screwed to the upper part of the vertical hole through a thread, and the lower end is in contact with the upper end of the shift shaft; the push shaft, washer and screw are arranged in the horizontal hole from the inside to the outside in sequence, the inner end of the push shaft is an inclined surface facing upward and is tightly fitted with the inclined surface of the shift shaft at the intersection of the horizontal hole and the vertical hole, the inner end of the screw is connected to the push shaft, and the swing support seat is connected to the outer end of the screw by a thread, and a ball hinge mechanism is provided inside, which can swing around the axis of the screw;

[0010] The wedge is an L-shaped component, including a wedge surface and a bottom plane and a side plane perpendicular to each other, the wedge surface forming a wedge angle with the bottom plane; the two wedges are symmetrically inserted between the big head end faces on both sides of the grinding machine top and the sleeve end face of the top sleeve, the bottom plane fits with the sleeve end face, the wedge surface contacts with the big head end face, the side plane of one wedge fits with the fixed support surface of the bow frame, and the side plane of the other wedge fits with the swing support seat.

[0011] Furthermore, the swing support seat includes a support seat and a ball joint connected to the support seat by a ball joint, one end of the ball joint is a ball head, and the other end is provided with a threaded hole connected to the screw rod, one end of the support seat is a thrust surface in contact with the wedge, and the other end is provided with a ball socket for accommodating the ball head, the ball head rotates in the ball socket, so that the support seat can swing around the ball joint, so that the spatial position of the thrust surface can adapt to the wedge and fit tightly with the side plane of the wedge.

[0012] Furthermore, the maximum swing angle of the support seat around the ball joint is 8°.

[0013] Furthermore, the resting surface and the thrust surface are planes.

[0014] Furthermore, the axis of the horizontal hole is located at the same level as the fixed surface and is perpendicular to the fixed surface.

[0015] Furthermore, the angle formed between the inclined surface of the shift axis and the axis of the shift axis is 10-15°, and the angle formed between the inclined surface of the push axis and the axis of the push axis is a complementary angle to the angle of the inclined surface of the shift axis.

[0016] Furthermore, the wedge angle of the wedge is 3 to 5 degrees.

[0017] Furthermore, the horizontal hole of the bow frame is a stepped hole, and the screw rod is a stepped shaft rod.

[0018] Another technical solution of the present invention is as follows:

[0019] A method for disassembling a cross pin grinding machine tip achieved by the above-mentioned quick disassembly device is characterized in that: the shift axis is pushed downward along the vertical hole of the bow frame by the rotation of the driving screw, and the shift axis pushes the push shaft to slide inward along the horizontal hole of the bow frame through the mutual sliding of the contact inclined surfaces, and then the bow frame, the screw and the swing support seat are used to apply inward force to the two wedges inserted between the grinding machine tip and the tip sleeve, and the grinding machine tip is removed from the tip sleeve by the action of the wedge surface.

[0020] Furthermore, the disassembly method includes the following specific steps:

[0021] 1) Insert two wedges symmetrically along the diameter direction between the end face of the grinding tip and the sleeve end face of the tip sleeve, so that the bottom plane of the wedge fits in with the sleeve end face and the wedge surface contacts the end face of the big head;

[0022] 2) The fixed surface of the arch frame is brought into contact with the side plane of one wedge, and then the position of the swing support seat is adjusted by the screw rod so that the swing support seat is brought into contact with the side plane of the other wedge;

[0023] 3) Turn the driving screw to push the shift shaft and the push shaft in turn, and then through the combined action of the swing support seat and the bow frame, push the two wedges between the grinding machine top and the top sleeve. Relying on the pushing force of the wedge surface of the wedge, the grinding machine top is separated from the top sleeve.

[0024] Compared with the prior art, the present invention achieves the following beneficial effects:

[0025] 1. Simply twist the modified screw and then drive a pair of wedges to smoothly dismantle the grinding machine tip, ensuring the safety of accessories and personnel.

[0026] 2. The quick disassembly device is easy to operate, reduces labor intensity and improves work efficiency;

[0027] 3. The present invention has a simple structure, low cost and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a simplified diagram of the cross pin.

[0029] Figure 2 This is a simplified diagram of the grinding machine center and center sleeve.

[0030] Figure 3 It is a structural diagram of the present invention.

[0031] Figure 4 It is a top view of the present invention in use.

[0032] Figure 5 Schematic diagram of the swing support.

[0033] Figure 6 yes Figure 5 Left view of .

[0034] Figure 7 This is a diagram of a wedge.

[0035] Figure 8 yes Figure 7 Top view of .

[0036] In the picture:

[0037] 1-bow frame, 11-fixed support surface, 12-horizontal hole, 13-vertical hole, 2-drive screw, 3-shift axis, 4-push shaft, 5-washer, 6-screw, 7-swing support seat, 71-support seat, 711-thrust surface, 72-ball joint, 721-threaded hole, 8-wedge, 81-bottom plane, 82-side plane, 83-wedge surface, 9-grinder top, 91-big head end face, 10-cross head pin, 101-large outer circle, 102-small outer circle, 20-top sleeve, 201-sleeve end face. DETAILED DESCRIPTION

[0038] The present invention is used for the disassembly operation between the grinding center and the center sleeve when the grinding machine is processing the crosshead pin of a large low-speed diesel engine. Figure 2 The small head end of the grinding machine top 9 is inserted into the top sleeve 20, and there is a gap between the large head end face 91 and the sleeve end face 201 of the top sleeve 20.

[0039] The present invention is described in detail below with reference to the accompanying drawings and embodiments. The embodiments are not intended to limit the scope of implementation of the present invention. Any equivalent changes and modifications made based on the contents of the present application fall within the scope of the present invention.

[0040] Example

[0041] Please refer to Figure 3 and Figure 4 The quick disassembly device includes a bow frame 1, a driving screw 2, a shift shaft 3, a push shaft 4, a washer 5, a screw 6, a swing support seat 7 and two wedges 8.

[0042] The bow frame 1 is the basic component of the entire device and is a transverse asymmetric C-shaped structure; the lower part of one side of the bow frame 1 is provided with an inward-facing resting surface 11, which is a plane, and the interior of the other side is provided with a horizontal hole 12 and a vertical hole 13 forming a cross, the horizontal hole 12 is a stepped hole, the axis of which is at the same level as the resting surface 11 and is perpendicular to the resting surface 11, and the upper part of the vertical hole 13 is provided with an internal thread for connecting the drive screw 2.

[0043] The shift shaft 3 is arranged in the lower part of the vertical hole 13, and the lower end is an inclined surface that extends into the horizontal hole 12. The inclined surface faces the inner side of the bow frame 1 and forms an angle of 10 to 15 degrees with the axis of the shift shaft 3; the driving screw 2 is screwed to the upper part of the vertical hole 13 through a thread, and the lower end contacts the upper end of the shift shaft 3.

[0044] The push shaft 4, washer 5, and screw 6 are sequentially arranged in the horizontal hole 12 of the bow frame 1 from the inside out. The inner end of the push shaft 4 is an upwardly inclined surface that fits tightly against the inclined surface of the shift axis 3 at the intersection of the horizontal hole 12 and the vertical hole 13. The angle formed between the inclined surface of the push shaft 4 and the axis of the push shaft 4 is a complementary angle to the angle formed between the inclined surface of the shift axis 3, that is, 90°-(10-15°)=80-75°. In other words, the inclined surface of the push shaft 4 is 80-75° to the horizontal plane. The screw 6 is a stepped shaft, with its inner end connected to the push shaft 4 and its outer end connected to the swing support seat 7. The washer 5 is placed on the screw 6 and is sandwiched between the stepped surface of the screw 6 and the push shaft 4.

[0045] Please refer to Figure 5 and Figure 6The swing support seat 7 is connected to the screw rod 6 by a thread, and the position of the swing support seat 7 can be adjusted by rotating the screw rod 6. The swing support seat 7 consists of a support seat 71 and a ball joint 72; the ball joint 72 is connected to the support seat 71 by a ball joint, one end of which is a ball head, and the center of the other end is provided with a threaded hole 721 for connecting with the screw rod 6; one end of the support seat 71 is a thrust surface 711 that contacts the wedge 8, and the thrust surface 711 is a plane, and the other end is provided with a ball socket for accommodating the ball head of the ball joint 72. The ball head of the ball joint 72 can rotate in the ball socket of the support seat 71, so that the support seat 71 can swing around the ball joint 72, so that the spatial position of the thrust surface 711 can adapt to the wedge 8 and fit tightly with the wedge 8; the maximum swing angle of the support seat 71 is 8°.

[0046] Please refer to Figure 7 and Figure 8 The wedge 8 is an L-shaped component, including a wedge surface 83 and a bottom plane 81 and a side plane 82 perpendicular to each other; the bottom plane 81 is in contact with the sleeve end face 201 of the top sleeve 20, and the wedge surface 83 is located on the inner side, forming a wedge angle of 3 to 5 degrees with the bottom plane 81. The wedge surface 83 contacts the large end face 91 of the grinding machine top 9. Two wedges 8 are used in pairs, see Figure 4 , symmetrically inserted between the big head end faces 91 on both sides of the grinding machine top 9 and the sleeve end face 201 of the top sleeve 20, the side plane 82 of one wedge 8 fits with the fixed support surface 11 of the bow frame 1, and the side plane 82 of the other wedge 8 fits with the thrust surface 711 of the swing support seat 7.

[0047] The present invention utilizes the quick-release device to implement a method for disassembling a grinding machine tip, including: rotating the drive screw to push the shift shaft downward along the vertical hole of the arch frame; the shift shaft, through the sliding contact of the inclined surfaces, pushes the push shaft inward along the horizontal hole of the arch frame; and then, relying on the arch frame, the screw, and the swing support, the two wedges inserted between the grinding machine tip and the tip sleeve are forced inward, thereby removing the grinding machine tip from the tip sleeve through the action of the wedge surfaces. The specific steps are as follows:

[0048] 1) Please refer to Figure 3 and Figure 4 First, insert the two wedges 8 symmetrically along the diameter direction between the large end face 91 of the grinding tip 9 and the sleeve end face 201 of the tip sleeve 20, so that the bottom plane 81 is in contact with the sleeve end face 201 and the wedge surface 83 is in contact with the large end face 91;

[0049] 2) The fixed support surface 11 on one side of the arch frame 1 is brought into contact with the side plane 82 of one wedge 8, and then the position of the swing support seat 7 on the other side of the arch frame 1 is adjusted by the screw 6 according to the distance between the two wedges 8, so that the swing support seat 7 is brought into contact with the side plane 82 of the other wedge 8;

[0050] 3) Turn the drive screw 2 to push the shift shaft 3 and the push shaft 4 in turn, and then through the combined action of the swing support seat 7 and the bow frame 1, push the two wedges 8 between the grinding machine top 9 and the top sleeve 20. Relying on the pushing force of the wedge surface 83 of the wedge 8, the grinding machine top 9 is separated from the top sleeve 20.

[0051] For ordinary technicians in the technical field to which the present invention belongs, obvious equivalent transformations and alternatives can be obtained without creative work without departing from the concept of the present invention, and they should be deemed to fall within the scope of protection required by the present invention.

Claims

1. A quick-release device for a grinding machine center for machining cross pins, inserted between the end face of the large head of the grinding machine center and the end face of the sleeve of the center sleeve, characterized in that: The quick disassembly device includes a bow frame, a driving screw, a shift shaft, a push shaft, a washer, a screw, a swing support seat and two wedges; The bow-shaped frame is arranged horizontally, with an inward-facing resting surface on one side and a cross-shaped horizontal hole and a vertical hole on the other side; The shift shaft is arranged at the lower part of the vertical hole, and the lower end is an inclined surface and extends into the horizontal hole, the inclined surface facing the inner side of the bow frame, and the driving screw is screwed to the upper part of the vertical hole through a thread, and the lower end is in contact with the upper end of the shift shaft; the push shaft, washer and screw are arranged in the horizontal hole from the inside to the outside in sequence, the inner end of the push shaft is an inclined surface facing upward and is tightly fitted with the inclined surface of the shift shaft at the intersection of the horizontal hole and the vertical hole, the inner end of the screw is connected to the push shaft, and the swing support seat is connected to the outer end of the screw by a thread, and a ball hinge mechanism is provided inside, which can swing around the axis of the screw; The wedge is an L-shaped component, including a wedge surface and a bottom plane and a side plane perpendicular to each other, the wedge surface forming a wedge angle with the bottom plane; the two wedges are symmetrically inserted between the big head end surface on both sides of the grinding machine top and the sleeve end surface of the top sleeve, the bottom plane is in contact with the sleeve end surface, the wedge surface is in contact with the big head end surface, the side plane of one wedge is in contact with the fixed support surface of the bow frame, and the side plane of the other wedge is in contact with the swing support seat; The swing support seat includes a support seat and a ball joint connected to the support seat by a ball joint. One end of the ball joint is a ball head, and the other end is provided with a threaded hole connected to the screw rod. One end of the support seat is a thrust surface in contact with the wedge, and the other end is provided with a ball socket for accommodating the ball head. The ball head rotates in the ball socket, so that the support seat can swing around the ball joint, so that the spatial position of the thrust surface can adapt to the wedge and fit tightly with the side plane of the wedge.

2. The quick disassembly device for a cross pin grinding machine according to claim 1, characterized in that: The maximum swing angle of the support seat around the ball joint is 8°.

3. The quick disassembly device for a cross pin grinding machine according to claim 1, characterized in that: The fixed support surface and the thrust surface are planes.

4. The quick disassembly device for a cross pin grinding machine center according to claim 1, characterized in that: The axis of the horizontal hole is located at the same level as the fixed surface and is perpendicular to the fixed surface.

5. The quick disassembly device for a cross pin grinding machine center according to claim 1, characterized in that: The angle formed between the inclined surface of the shift axis and the axis of the shift axis is 10-15 degrees, and the angle formed between the inclined surface of the push axis and the axis of the push axis is a complementary angle to the angle of the inclined surface of the shift axis.

6. The quick disassembly device for a cross pin grinding machine center according to claim 1, characterized in that: The wedge angle of the wedge is 3-5 degrees.

7. The quick disassembly device for a cross pin grinding machine center according to claim 1, characterized in that: The horizontal hole of the bow frame is a stepped hole, and the screw rod is a stepped shaft rod.

8. A method for disassembling a cross pin grinding machine tip using the quick disassembly device according to claim 1, characterized in that: The shift shaft is pushed downward along the vertical hole of the bow frame by the rotation of the driving screw, and the shift shaft pushes the push shaft to slide inward along the horizontal hole of the bow frame through the mutual sliding of the contact inclined surfaces. Then, the bow frame, the screw and the swing support seat apply inward force to the two wedges inserted between the grinding machine top and the top sleeve, and the grinding machine top is removed from the top sleeve by the action of the wedge surface.

9. The method for disassembling a cross pin grinding center according to claim 8, wherein: The disassembly method includes the following specific steps: 1) Insert two wedges symmetrically along the diameter direction between the end face of the grinding tip and the sleeve end face of the tip sleeve, so that the bottom plane of the wedge fits in with the sleeve end face and the wedge surface contacts the end face of the big head; 2) The fixed surface of the arch frame is brought into contact with the side plane of one wedge, and then the position of the swing support seat is adjusted by the screw rod so that the swing support seat is brought into contact with the side plane of the other wedge; 3) Turn the driving screw to push the shift shaft and the push shaft in turn, and then through the combined action of the swing support seat and the bow frame, push the two wedges between the grinding machine top and the top sleeve. Relying on the pushing force of the wedge surface of the wedge, the grinding machine top is separated from the top sleeve.

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