Coreless grinding machine for machining small cylinder sleeve

Abstract

The invention relates to the technical field of grinding machines, in particular to a coreless grinding machine for machining a small cylinder sleeve, which comprises a grinding machine base, a grinding wheel and a guide wheel, the grinding wheel and the guide wheel are both arranged on the grinding machine base, a workpiece supporting plate is arranged between the grinding wheel and the guide wheel, and a return lifting shaft is arranged above the workpiece supporting plate between the grinding wheel and the guide wheel. The return lifting shaft is parallel to the axis of the grinding wheel, and a mounting hidden groove is formed in the return lifting shaft; after the air cylinder sleeve moves to the position of the cylinder sleeve position sensor through grinding machining, the return lifting shaft is used for controlling the air cylinder sleeve to be lifted, the air cylinder sleeve automatically slides and returns to the side where a worker is located, and occupation of the worker for receiving the machined air cylinder sleeve on the other side is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of grinders, in particular to a coreless grinder for machining small cylinder sleeves. Background Art

[0002] A coreless grinder, also known as a centerless grinder, is a type of grinder that does not require the axis of the workpiece for positioning during grinding. It is mainly composed of three mechanisms: a grinding wheel, a guide wheel, and a workpiece holder. The grinding wheel actually performs the grinding work, the guide wheel controls the rotation of the workpiece and the feed speed of the workpiece, and the workpiece holder supports the workpiece during grinding. Since the cylinder liner wall is thin and easily deformed by clamping, a coreless grinder is usually used for grinding during grinding.

[0003] During the grinding process, axial feed is achieved by adjusting the inclination angle of the guide wheel axis. Therefore, during the grinding process of the cylinder liner in the coreless grinder, it is usually placed between the grinding wheel and the guide wheel from one side of the coreless grinder. As the grinding progresses, the cylinder liner automatically moves axially and moves out from the other side of the coreless grinder. In the prior art, a workpiece basket is usually set on the other side to receive the automatically moved workpiece. However, due to the thin wall of the cylinder liner, the impact of the fall when it falls into the basket will affect the quality of the cylinder liner and even cause slight deformation. Some companies will set up a receiving post on the other side and set up separate staff to receive the cylinder liner that is automatically moved out after grinding, which greatly increases the cost. Summary of the invention

[0004] The object of the present invention is to provide a coreless grinder for machining small cylinder liners to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a coreless grinder for processing small cylinder liners, comprising a grinder base, a grinding wheel and a guide wheel, wherein the grinding wheel and the guide wheel are both arranged on the grinder base, a workpiece support plate is arranged between the grinding wheel and the guide wheel, a return lifting shaft is arranged above the workpiece support plate between the grinding wheel and the guide wheel, the return lifting shaft is parallel to the axis of the grinding wheel, a hidden installation groove is opened in the return lifting shaft, a cylinder liner position sensor is embedded and fixed in the hidden installation groove, and the cylinder liner position sensor is used to The position of the cylinder liner is detected, a sub-control slider is arranged at one end of the return lifting shaft, a limiting slide is arranged outside the sub-control slider, the limiting slide is fixedly installed to the grinder base, the sub-control slider can slide up and down inside the limiting slide, and a swing control mechanism is arranged inside and outside the sub-control slider. When the cylinder liner position sensor detects the cylinder liner, the swing control mechanism drives the sub-control slider to move upward inside the limiting slide, and after moving a certain distance, controls the end of the return lifting shaft away from the sub-control slider to swing downward.

[0006] The swing control mechanism includes an inner groove of a slider, a fixed horizontal axis and a control swing plate. The inner groove of the slider is opened inside the sub-control slider, and a fixed horizontal axis is fixedly arranged on the inner wall of the inner groove of the slider. A control swing plate is swingably installed outside the fixed horizontal axis, and the control swing plate is integrally fixed to the end of the return lifting shaft.

[0007] A positioning blind groove is provided on the lower surface of the control swing plate, and a supporting spring is arranged in the positioning blind groove. A limiting pressure edge is fixedly arranged on the inner upper surface of the inner groove of the slider. The supporting spring provides an upward elastic thrust to the control swing plate, so that the control swing plate is in limited contact with the limiting pressure edge, and the return lifting shaft is in a horizontal state at this time.

[0008] A lifting control cylinder is arranged below the sub-control slider, which drives the sub-control slider to lift and slide along the length direction of the limiting slide through the lifting control cylinder. A right-angle pressure eaves is fixedly arranged at the upper end of the limiting slide. When the sub-control slider rises to a certain height relative to the limiting slide, the right-angle pressure eaves will squeeze the upper surface position of the control swing plate to make the control swing plate swing. At this time, the return lifting shaft swings downward at the end away from the sub-control slider.

[0009] A cylindrical shaft cavity is provided inside the return lifting shaft, and the cylindrical shaft cavity is open at one end away from the position of the sub-control slider. A dynamically extending inner shaft is inserted into the cylindrical shaft cavity, and the dynamically extending inner shaft is in sealing contact with the cylindrical shaft cavity. An interconnecting flow channel is provided in the return lifting shaft and the control swing plate, and one end of the interconnecting flow channel is connected to a movable connecting pipe, and the other end of the interconnecting flow channel is connected to the cylindrical shaft cavity.

[0010] A slider vertical shaft is fixedly arranged on the upper surface of the sub-control slider, a medium cylinder is fixedly arranged on the upper surface of the limit slide, a piston body is arranged in the medium cylinder, the piston body is in sealing contact with the inner wall surface of the medium cylinder, and the piston body is fixedly connected to the upper end of the slider vertical shaft.

[0011] A vertical shaft cavity is provided in the vertical shaft of the slider, the upper end of the vertical shaft cavity passes through the piston body and is connected with the cavity of the medium cylinder body, the lower end of the vertical shaft cavity is connected with the movable connecting pipe, and a breathing hole is provided on the upper surface of the limiting slideway, and the breathing hole is connected with the lower part of the medium cylinder body.

[0012] The dynamically extending inner shaft is provided with an accommodating inner cavity, in which an electromagnet module is arranged, a contact spring is fixedly provided at the end of the dynamically extending inner shaft, and the contact spring is in sliding conductive contact with the inner wall surface of the cylindrical shaft cavity, and a first guide piece is fixedly provided on the outside of the control swing plate, and one pole of the electromagnet module is powered and conductively connected through the contact spring, the return lifting shaft, the control swing plate and the first guide piece in sequence.

[0013] A spiral wire is arranged inside the cylindrical shaft cavity, and a second guide piece is embedded and installed outside the return lifting shaft. The return lifting shaft and the second guide piece are insulated and sealed in contact with each other, and the other pole of the electromagnet module is powered and connected to the second guide piece through the spiral wire.

[0014] A tool bench is arranged outside the grinder base, and a control cabinet is arranged on the tool bench. A driving motor, a transmission compartment and a guide wheel control compartment are fixedly arranged on the upper part of the grinder base. The driving motor drives the grinding wheel to rotate through the transmission compartment, and the guide wheel control compartment drives and controls the angle of the guide wheel. A limit stop strip is fixedly arranged on the outer surface of the return lifting shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The coreless grinder for processing small cylinder liners of the present invention cooperates with the return lifting shaft, the sub-control slide block and the swing control mechanism etc. After the cylinder liners are moved to the position of the cylinder liners position sensor during the grinding process, the return lifting shaft is used to control the lifting of the cylinder liners, and the cylinder liners are automatically slid back to the side where the staff are located, thus saving the occupation of the staff on the other side to receive the processed cylinder liners, and the cylinder liners workpieces can be put in and returned on the same side.

[0016] The present invention cooperates with the dynamically extendable inner shaft, the medium cylinder body, the slider vertical shaft and the swing control mechanism, etc., and can cooperate with the movement of the sub-control slider when the cylinder liner is lifted and returned, so that the dynamically extendable inner shaft is automatically extended, and the length of the return lifting shaft is extended, so that the sliding return position is away from the grinding wheel and the guide wheel, thereby improving safety; and in the process of placement and processing, the dynamically extendable inner shaft is retracted, so that the overall length of the return lifting shaft is shorter, thereby avoiding affecting the processing and placement of the cylinder liner.

[0017] By setting up the electromagnet module, contact springs, spiral wire and other structures, the electromagnet module can be powered and controlled without affecting the dynamic extension of the inner shaft telescopic activity. When the cylinder liner slides down and moves near the electromagnet module, the electromagnet module can generate magnetic constraints, thereby achieving a deceleration effect, making it easier for staff to pick up the cylinder liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is the front view of the overall structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the return lifting shaft of the present invention.

[0021] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0022] Figure 5 for Figure 4 Enlarged schematic diagram of area B in the middle.

[0023] Figure 6 It is a three-dimensional half-section schematic diagram of the return lifting shaft of the present invention.

[0024] Figure 7 for Figure 6 Enlarged schematic diagram of area C in the middle.

[0025] Figure 8 for Figure 7 Enlarged schematic diagram of area D in the middle.

[0026] Fig. 9 for Figure 7 Enlarged schematic diagram of area E in the middle.

[0027] Fig.10 for Fig. 9 Enlarged schematic diagram of area F in the middle.

[0028] In the figure: 1. Grinding machine base; 2. Grinding wheel; 3. Guide wheel; 4. Workpiece support plate; 5. Return lifting shaft; 6. Install hidden groove; 7. Cylinder sleeve position sensor; 8. Separate control slider; 9. Limit slideway; 801. Slider inner groove; 802. Fixed horizontal axis; 803. Control swing plate; 804. Positioning blind groove; 805. Support spring; 806. Limit pressure edge; 807. Lifting control cylinder; 808. Right angle pressure eaves; 809. Cylindrical shaft cavity; 810. Dynamic extension inner shaft; 811. Interconnecting flow channel; 812, movable connecting pipe; 813, slider vertical shaft; 814, medium cylinder body; 815, piston body; 816, vertical shaft inner cavity; 817, breathing hole; 501, accommodating inner cavity; 502, electromagnet module; 503, contact spring; 504, spiral wire; 505, first guide piece; 506, second guide piece; 101, tool table; 102, control cabinet; 201, drive motor; 202, transmission compartment; 301, guide wheel control compartment; 507, limit stop bar. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 10 The present invention provides a technical solution: a coreless grinder for machining small cylinder sleeves, such as Figure 1As shown in , it includes a grinder base 1, a grinding wheel 2 and a guide wheel 3. The grinding wheel 2 and the guide wheel 3 are both arranged on the grinder base 1. The guide wheel 3 is made of rubber. A workpiece support plate 4 is arranged between the grinding wheel 2 and the guide wheel 3. Figure 4 and Figure 5 As shown in the figure, a return lifting shaft 5 is arranged between the grinding wheel 2 and the guide wheel 3 and above the workpiece support plate 4. The return lifting shaft 5 is parallel to the axis of the grinding wheel 2. A hidden installation groove 6 is opened in the return lifting shaft 5. A cylinder liner position sensor 7 is embedded and fixed in the hidden installation groove 6. The cylinder liner position sensor 7 is used to detect the position of the cylinder liner. The cylinder liner position sensor 7 can adopt an inductive sensor or a capacitive sensor, which can detect foreign objects above the cylinder liner position sensor 7.

[0031] A sub-control slider 8 is arranged at one end of the return lifting shaft 5, and a limiting slide 9 is arranged outside the sub-control slider 8. The limiting slide 9 is fixedly installed on the grinding machine base 1. The sub-control slider 8 can slide up and down inside the limiting slide 9. A swing control mechanism is arranged inside and outside the sub-control slider 8. When the cylinder liner position sensor 7 detects the cylinder liner, the swing control mechanism drives the sub-control slider 8 to move upward inside the limiting slide 9, and after moving a certain distance, controls the end of the return lifting shaft 5 away from the sub-control slider 8 to swing downward.

[0032] like Fig. 9 As shown in the figure, the swing control mechanism includes a slider inner groove 801, a fixed horizontal axis 802 and a control swing plate 803. The sub-control slider 8 is provided with a slider inner groove 801, and a fixed horizontal axis 802 is fixedly provided on the inner wall of the slider inner groove 801. The external swing of the fixed horizontal axis 802 is provided with a control swing plate 803, and the control swing plate 803 is integrally fixed to the end of the return lifting shaft 5.

[0033] A positioning blind groove 804 is provided on the lower surface of the control swing plate 803, and a support spring 805 is arranged in the positioning blind groove 804. A limiting pressure edge 806 is fixedly arranged on the inner upper surface of the inner groove 801 of the slider. The support spring 805 provides an upward elastic thrust to the control swing plate 803, so that the control swing plate 803 is in limited contact with the limiting pressure edge 806. At this time, the return lifting shaft 5 is in a horizontal state. The supporting elastic force of the support spring 805 must be strong enough so that the return lifting shaft 5 can still maintain a horizontal state after lifting the cylinder sleeve.

[0034] A lifting control cylinder 807 is arranged below the sub-control slider 8, and the lifting control cylinder 807 drives the sub-control slider 8 to lift and slide along the length direction of the limiting slide 9. A right-angle pressure eave 808 is fixedly arranged at the upper end of the limiting slide 9. When the sub-control slider 8 rises to a certain height relative to the limiting slide 9, the right-angle pressure eave 808 will be squeezed on the upper surface position of the control swing plate 803 to make the control swing plate 803 swing. At this time, the end of the return lifting shaft 5 away from the sub-control slider 8 swings downward.

[0035] A cylindrical shaft cavity 809 is provided inside the return lifting shaft 5, and the cylindrical shaft cavity 809 is open at one end away from the position of the sub-control slider 8. A dynamically extending inner shaft 810 is inserted into the cylindrical shaft cavity 809, and the dynamically extending inner shaft 810 is in sealed contact with the cylindrical shaft cavity 809. An interconnecting flow channel 811 is provided in the return lifting shaft 5 and the control swing plate 803, and one end of the interconnecting flow channel 811 is connected to a movable connecting pipe 812, and the other end of the interconnecting flow channel 811 is connected to the cylindrical shaft cavity 809.

[0036] A slider vertical shaft 813 is fixedly provided on the upper surface of the sub-control slider 8, and a medium cylinder 814 is fixedly provided on the upper surface of the limit slide 9. A piston body 815 is provided in the medium cylinder 814. The piston body 815 is in sealing contact with the inner wall surface of the medium cylinder 814. The piston body 815 is fixedly connected to the upper end of the slider vertical shaft 813. The medium in the medium cylinder 814 can be hydraulic oil or air, etc.

[0037] A vertical shaft cavity 816 is opened in the slider vertical shaft 813, the upper end of the vertical shaft cavity 816 passes through the piston body 815 and is connected with the inner cavity of the medium cylinder body 814, the lower end of the vertical shaft cavity 816 is connected with the movable connecting pipe 812, and a breathing hole 817 is opened through the upper surface of the limiting slide 9, and the breathing hole 817 is connected with the lower part of the medium cylinder body 814.

[0038] An accommodating inner cavity 501 is opened in the dynamically extending inner shaft 810, and an electromagnet module 502 is arranged in the accommodating inner cavity 501. A contact spring 503 is fixedly arranged at the end of the dynamically extending inner shaft 810. The contact spring 503 is in sliding conductive contact with the inner wall surface of the cylindrical shaft cavity 809. A first guide piece 505 is fixedly arranged on the outside of the control swing plate 803. One pole of the electromagnet module 502 is powered and connected to the first guide piece 505 in sequence through the contact spring 503, the return lifting shaft 5, the control swing plate 803, etc., wherein the return lifting shaft 5, the control swing plate 803, etc. are all made of metal conductive material.

[0039] The interior of the cylindrical shaft cavity 809 is provided with a spiral conductor 504, and the exterior of the return lifting shaft 5 is embedded with a second guide piece 506. The return lifting shaft 5 and the second guide piece 506 are insulated and sealed contact, that is, the surface of the second guide piece 506 is covered with an insulating layer, and while being in sealed contact with the return lifting shaft 5, it is not conductive with the return lifting shaft 5. The other pole of the electromagnet module 502 is powered by the spiral conductor 504 and conductively connected with the second guide piece 506. The conductive connection between the electromagnet module 502 and the spiral conductor 504 is insulated and protected, which is not illustrated in detail in the figure. The spiral conductor 504 can be inserted into the interior of the dynamically extending inner shaft 810 and welded to the power supply contact of the electromagnet module 502. The outer surface of the spiral conductor 504 is covered with an insulating layer. At this time, the outer surface insulating layer of the spiral conductor 504 is insulated and separated from the dynamically extending inner shaft 810.

[0040] A tool table 101 is arranged outside the grinder base 1, and a control cabinet 102 is arranged on the tool table 101. A driving motor 201, a transmission compartment 202 and a guide wheel control compartment 301 are fixedly arranged on the upper part of the grinder base 1. The driving motor 201 drives the grinding wheel 2 to rotate through the transmission compartment 202, and the guide wheel control compartment 301 drives and controls the angle of the guide wheel 3. A limit stop bar 507 is fixedly arranged on the outer surface of the return lifting shaft 5.

[0041] When the coreless grinding machine of the present invention is used, Figure 1 and Figure 2 As shown in the figure, the cylinder liner workpiece is placed between the grinding wheel 2 and the guide wheel 3, and is located above the workpiece support plate 4. The guide wheel 3 has a certain inclination angle relative to the axis of the grinding wheel 2. During the grinding process, the cylinder liner will move from one side of the coreless grinder to the other side along the length direction of the workpiece support plate 4.

[0042] like Figure 3 , Figure 4 and Figure 5 As shown in , with the axial feed movement of the cylinder liner, the return lifting shaft 5 will be inserted into the interior of the cylinder liner. When the cylinder liner moves to the position of the cylinder liner position sensor 7, it can be detected by the cylinder liner position sensor 7. At this time, the lifting control cylinder 807 extends to drive the sub-control slider 8 to move upward relative to the limit slide 9.

[0043] During the rising process of the sub-control slider 8, the sub-control slider 8 drives the return lifting shaft 5 to move upward, and lifts the cylinder sleeve through the return lifting shaft 5, so that the cylinder sleeve moves out from between the grinding wheel 2 and the guide wheel 3, and the grinding process is stopped; and at the same time, the piston body 815 moves upward inside the medium cylinder body 814, so that the internal medium of the medium cylinder body 814 flows into the movable connecting pipe 812 through the vertical shaft inner cavity 816, and then enters the cylindrical shaft cavity 809 through the interconnecting flow channel 811, pushing the dynamically extended inner shaft 810 to extend from the return lifting shaft 5.

[0044] As the sub-control slider 8 moves upward, when the right-angle pressure eaves 808 is in contact with the control swing plate 803, the right-angle pressure eaves 808 pushes the control swing plate 803 to swing, so that the support spring 805 is forced to be compressed. At this time, the end of the return lifting shaft 5 away from the sub-control slider 8 swings downward, and the cylinder sleeve on the outside of the return lifting shaft 5 slides along the axial direction of the return lifting shaft 5; because the dynamic extension inner shaft 810 is extended, the guide length of the return lifting shaft 5 is greatly extended, and the cylinder sleeve slides from the return lifting shaft 5 to the dynamic extension inner shaft 810, so that the staff can stay away from the grinding wheel 2 and the guide wheel 3 when receiving the cylinder sleeve, thereby improving safety.

[0045] The positive and negative electrodes of the external power supply are respectively connected to the second guide piece 506 and the first guide piece 505 , so as to supply power to the electromagnet module 502 and control the operation of the electromagnet module 502 .

[0046] When the cylinder liner slides to the position of the electromagnet module 502, the electromagnet module 502 is powered to generate magnetic force, which attracts and binds the cylinder liner. At the same time, the magnetic attraction is used to increase the friction between the cylinder liner and the dynamically extending inner shaft 810, which can slow down the sliding speed of the cylinder liner and facilitate the staff to pick it up.

[0047] After completing a work, the lifting control cylinder 807 shrinks and resets, causing the sub-control slider 8 to descend. After losing the squeezing of the right-angle pressure eaves 808, the lifting shaft 5 returns to a horizontal state under the supporting elastic force of the support spring 805. At the same time, the piston body 815 moves downward inside the medium cylinder body 814, causing the negative pressure inside the medium cylinder body 814 to be sucked back. At this time, the dynamically extended inner shaft 810 automatically shrinks and resets.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coreless grinder for processing small cylinder liners, comprising a grinder base (1), a grinding wheel (2) and a guide wheel (3), wherein the grinding wheel (2) and the guide wheel (3) are both arranged on the grinder base (1), and a workpiece support plate (4) is arranged between the grinding wheel (2) and the guide wheel (3), characterized in that: A return lifting shaft (5) is arranged between the grinding wheel (2) and the guide wheel (3) and above the workpiece support plate (4). The return lifting shaft (5) and the axis of the grinding wheel (2) are parallel to each other. A mounting hidden groove (6) is provided in the return lifting shaft (5). A cylinder liner position sensor (7) is embedded and fixed in the mounting hidden groove (6). The cylinder liner position sensor (7) is used to detect the position of the cylinder liner. A sub-control slider (8) is arranged at one end of the return lifting shaft (5). The sub-control slider (8) A limit slide (9) is arranged outside the grinding machine base (1), the limit slide (9) is fixedly installed with the grinding machine base (1), the sub-control slider (8) can slide up and down inside the limit slide (9), and a swing control mechanism is arranged inside and outside the sub-control slider (8). When the cylinder liner position sensor (7) detects the cylinder liner, the swing control mechanism drives the sub-control slider (8) to move upward inside the limit slide (9), and after moving a certain distance, controls the return lifting shaft (5) to swing downward at one end away from the sub-control slider (8).

2. The coreless grinding machine for machining small cylinder liners according to claim 1, characterized in that: The swing control mechanism comprises a slider inner groove (801), a fixed horizontal axis (802) and a control swing plate (803); the sub-control slider (8) is provided with a slider inner groove (801) inside, a fixed horizontal axis (802) is fixedly arranged on the inner wall of the slider inner groove (801), and a control swing plate (803) is swingably installed outside the fixed horizontal axis (802); the control swing plate (803) is integrally fixed to the end of the return lifting shaft (5).

3. The coreless grinding machine for machining small cylinder liners according to claim 2, characterized in that: A positioning blind groove (804) is provided on the lower surface of the control swing plate (803), and a support spring (805) is arranged in the positioning blind groove (804). A limiting pressure edge (806) is fixedly arranged on the inner upper surface of the inner groove (801) of the slider. The support spring (805) provides an upward elastic thrust to the control swing plate (803), so that the control swing plate (803) is in limiting contact with the limiting pressure edge (806), and the return lifting shaft (5) is in a horizontal state.

4. The coreless grinding machine for machining small cylinder liners according to claim 3 is characterized in that: A lifting control cylinder (807) is provided below the sub-control slider (8), and the lifting control cylinder (807) drives the sub-control slider (8) to lift and slide along the length direction of the limit slide (9). A right-angle pressure eave (808) is fixedly provided at the upper end of the limit slide (9). When the sub-control slider (8) rises to a certain height relative to the limit slide (9), the right-angle pressure eave (808) will press on the upper surface of the control swing plate (803) to make the control swing plate (803) swing. At this time, the end of the return lifting shaft (5) away from the sub-control slider (8) swings downward.

5. The coreless grinding machine for machining small cylinder liners according to claim 2, characterized in that: A cylindrical shaft cavity (809) is provided inside the return lifting shaft (5), and the cylindrical shaft cavity (809) is open at one end away from the position of the sub-control slider (8), and a dynamic extension inner shaft (810) is inserted into the cylindrical shaft cavity (809), and the dynamic extension inner shaft (810) is in sealed contact with the cylindrical shaft cavity (809). An interconnecting flow channel (811) is provided in the return lifting shaft (5) and the control swing plate (803), and one end of the interconnecting flow channel (811) is connected to a movable connecting pipe (812), and the other end of the interconnecting flow channel (811) is connected to the cylindrical shaft cavity (809).

6. The coreless grinding machine for machining small cylinder liners according to claim 5, characterized in that: A slider vertical shaft (813) is fixedly provided on the upper surface of the sub-control slider (8), a medium cylinder body (814) is fixedly provided on the upper surface of the limit slideway (9), a piston body (815) is provided in the medium cylinder body (814), the piston body (815) is in sealing contact with the inner wall surface of the medium cylinder body (814), and the piston body (815) is fixedly connected to the upper end of the slider vertical shaft (813).

7. The coreless grinding machine for machining small cylinder liners according to claim 6, characterized in that: The slider vertical shaft (813) is provided with a vertical shaft inner cavity (816), the upper end of the vertical shaft inner cavity (816) passes through the piston body (815) and is in communication with the inner cavity of the medium cylinder body (814), the lower end of the vertical shaft inner cavity (816) is in communication with the movable connecting pipe (812), and the upper surface of the limit slideway (9) is provided with a breathing hole (817), and the breathing hole (817) is in communication with the lower part of the medium cylinder body (814).

8. The coreless grinding machine for machining small cylinder liners according to claim 5, characterized in that: The dynamically extending inner shaft (810) is provided with an accommodating inner cavity (501), and an electromagnet module (502) is arranged in the accommodating inner cavity (501). A contact spring (503) is fixedly arranged at the end of the dynamically extending inner shaft (810), and the contact spring (503) is in sliding conductive contact with the inner wall surface of the cylindrical shaft cavity (809). A first guide piece (505) is fixedly arranged on the outside of the control swing plate (803), and one pole of the electromagnet module (502) is powered and connected to the first guide piece (505) in sequence through the contact spring (503), the return lifting shaft (5), the control swing plate (803) and the first guide piece (505).

9. The coreless grinding machine for machining small cylinder liners according to claim 8, characterized in that: A spiral conductor (504) is arranged inside the cylindrical shaft cavity (809), and a second guide piece (506) is embedded and installed outside the return lifting shaft (5). The return lifting shaft (5) and the second guide piece (506) are insulated and sealed contact, and the other pole of the electromagnet module (502) is powered and connected to the second guide piece (506) through the spiral conductor (504).

10. The centerless grinder for machining small cylinder liners according to claim 1, characterized in that: A tool table (101) is arranged outside the grinding machine base (1), and a control cabinet (102) is arranged on the tool table (101). A driving motor (201), a transmission compartment (202) and a guide wheel control compartment (301) are fixedly arranged on the upper part of the grinding machine base (1). The driving motor (201) drives the grinding wheel (2) to rotate through the transmission compartment (202), and the guide wheel control compartment (301) drives and controls the angle of the guide wheel (3). A limit stop bar (507) is fixedly arranged on the outer surface of the return lifting shaft (5).

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