CN111843813A - A hydraulic driven internal combustion engine cylinder bore machining honing head and its hydraulic circuit - Google Patents

Abstract

The invention discloses a honing head for machining a cylinder hole of a hydraulically driven internal combustion engine and its hydraulic circuit. The honing head is mainly composed of an input transmission shaft, a double-acting hydraulic cylinder, a single-acting hydraulic cylinder, an oil distribution plate and the like. There are 3 rectangular grooves evenly distributed in the circumferential direction of the surface, and 3 rectangular convex keys are evenly distributed on the outer surface of the piston, so that the double-acting hydraulic cylinder can realize not only axial reciprocating linear motion, but also circumferential rotating motion; single-acting hydraulic cylinder is composed of Honing body, push rod, return spring, whetstone seat, expansion and contraction spring, and whetstone. The push rod can realize linear reciprocating movement under the action of hydraulic pressure and return spring force. The two conical surfaces of the outer circular surface of the push rod and the whetstone The cooperation of the inner conical surface of the seat realizes the radial movement of the oil stone. The invention stabilizes the honing work of the cylinder bore of the internal combustion engine, thereby achieving the high-precision grade of cylindricity and straightness of the machining surface of the cylinder bore of the internal combustion engine, and greatly improving the working efficiency of the internal combustion engine and the surface quality of the cylinder bore.

Description

A hydraulic driven internal combustion engine cylinder bore machining honing head and its hydraulic circuit

technical field

The invention relates to the technical field of honing machining of internal combustion engine cylinder holes, in particular to a hydraulically driven honing head for machining cylinder holes of an internal combustion engine and a hydraulic circuit thereof.

Background technique

As a kind of power machine with high thermal efficiency, the internal combustion engine is widely used in various fields of national economy and people's livelihood. In recent decades, with the increasing global shortage of non-renewable energy and environmental protection issues, the fuel efficiency and environmental protection requirements for internal combustion engines have become higher and higher. The cylinder block is the main part of the internal combustion engine, and its cylinder hole acts as the main place for the work of fuel combustion and the work of the piston reciprocating motion when the internal combustion engine is working.

Most of the existing internal combustion engine cylinder hole honing processing devices are mechanical transmission, the transmission device has a complex structure, and there are many processing procedures, so the accumulated error is large and the processing accuracy level is not high. The invention adopts hydraulic drive, its power transmission is stable and reliable, its structure is simple and reasonable, and its control precision and automation degree are high. to a greater effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a honing head for honing a cylinder bore of an internal combustion engine, which is simple in structure, stable and reliable, and has high control precision, so as to solve the problems raised in the above-mentioned background art.

To achieve the above object, the present invention provides the following technical solutions:

A hydraulically driven internal combustion engine cylinder bore machining honing head, comprising an input drive shaft, a double-acting hydraulic cylinder, a single-acting hydraulic cylinder, an oil distribution plate and a support bearing;

The double-acting hydraulic cylinder includes a cylinder body, the input drive shaft is fixed on the left end cover of the cylinder body, the piston in the cylinder body divides the cylinder body into two left and right working oil chambers, and the right end cover of the double-acting hydraulic cylinder runs through a right end cover. The oil port is connected to the right working oil chamber, the left oil port of the double-acting hydraulic cylinder is connected to the left working oil chamber through the left end cover, and the right end of the piston is connected to one end of the piston rod. the seal;

The single-acting hydraulic cylinder is composed of a honing body, a push rod, a return spring, a whetstone seat, an expansion and contraction spring, and a whetstone. The honing body is rigidly connected to the other end of the piston rod, and the left end of the push rod and the honing body form a closed working oil. The left end cover of the single-acting hydraulic cylinder has a single-acting hydraulic cylinder oil port connected to the working oil chamber. A return spring is installed between the right end of the push rod and the right end of the honing body. The oil stone is installed on the oil stone seat through the expansion and contraction spring, so The oilstone seat is installed in the oilstone seat groove evenly distributed in the circumferential direction of the single-acting hydraulic cylinder body, and the outer conical surface of the push rod is closely matched with the inner conical surface of the oilstone seat;

The oil distribution plate and the outer ring of the support bearing are fixedly connected together, and are respectively installed on the left end cover of the double-acting hydraulic cylinder, the right end cover and the left end cover of the single-acting hydraulic cylinder, and a rotating friction pair is formed between the oil distribution plate and the end cover of the cylinder body. , There is an oil distribution groove on the oil distribution pan.

Further, the convex keys evenly distributed on the outer circumference of the piston are closely matched with the evenly distributed grooves on the cylindrical surface of the cylinder.

Further, the groove is rectangular, and the number is 3, and the convex key is rectangular, and the number is 3;

Further, there are eight right oil ports, left oil ports and single-acting cylinder oil ports respectively.

Further, there are two conical revolving surfaces on the outer circular surface of the push rod to cooperate with the conical surfaces on the inner circular surface of the oilstone seat.

A hydraulic circuit of a honing head for hydraulically driven internal combustion engine cylinder bore processing includes an oil circuit for axial reciprocating motion of the honing head, an oil circuit for rotary motion of the honing head, an oil circuit for radial expansion of an oil stone, three oil circuits are independently controlled, and a hydraulic pump station provides a hydraulic circuit power source;

The axial reciprocating oil circuit pressure oil of the honing head enters the check valve through the hydraulic pump station. The check valve mainly prevents the backflow of the working circuit pressure oil in the oil circuit, and the accumulator can reduce the pressure shock in the oil circuit. Keep the system pressure stable; the two-way hydraulic lock between the three-position four-way electromagnetic reversing valve and the double-acting hydraulic cylinder is composed of two hydraulically controlled check valves in parallel, and each check valve takes the pressure of the opposite oil circuit as the pilot pressure , When the three-position four-way electromagnetic reversing valve is in the neutral position, the pilot pressures of the two one-way valves are equal, and the one-way valve is closed, so that the force of the left and right working oil chambers of the double-acting hydraulic cylinder is balanced, and the axial position of the piston and the honing head is fixed. ;When the honing head is fed axially, the axial motion control signal of the honing head makes the right position of the three-position four-way electromagnetic reversing valve energized, the two-way hydraulic lock and the left hydraulic control check valve are opened, and the left working oil chamber of the double-acting hydraulic cylinder is opened. The left oil port on the upper side enters the oil, the left working oil chamber is pressurized, the volume increases, pushes the piston to move to the right, the right oil port on the right working oil chamber returns oil, and the piston drives the piston rod and the honing body rigidly connected to the piston rod. Move to the right to complete the axial feed of the honing head; the axial movement control signal of the honing head makes the left position of the three-position four-way electromagnetic reversing valve energized, the two-way hydraulic lock opens the right hydraulic control check valve, and the double-acting hydraulic cylinder right The right oil port on the working oil chamber enters oil, the right working oil chamber is pressurized, the volume increases, the piston is pushed to the left, the left oil port on the left working oil chamber returns oil, and the piston drives the piston rod and is rigidly connected to the piston rod The honing body moves to the left to complete the axial retraction of the honing head and complete the axial reciprocating motion of the honing head;

The normal state of the two-position four-way electromagnetic reversing valve in the rotary motion oil circuit of the honing head is the right position. When the honing head rotary motion control signal is energized and the two-position four-way electromagnetic reversing valve works in the left position, the variable hydraulic motor will press the pressure. It can be converted into rotating mechanical energy, and the torque and speed are transmitted to the honing body through the input drive shaft, which drives the honing head to rotate;

When the two-position three-way electromagnetic reversing valve in the radial expansion oil circuit of the oil stone works in the left position, the oil port of the single-acting cylinder on the working oil chamber of the single-acting hydraulic cylinder enters the oil, and pushes the push rod to move to the right. The movement is transformed into the radial movement of the oilstone seat, the oilstone expands, and the hydraulic pressure of the working oil chamber is converted into the honing working pressure of the oilstone. To release the pressure, move to the left under the action of the push rod return spring, the oilstone seat is retracted, and the oilstone is relieved of pressure.

Compared with the prior art, the beneficial effects of the present invention:

The invention mainly relies on the oil pressure of the hydraulic pump station as the power source. Compared with the mechanical transmission, the hydraulic transmission has stable transmission, large transmission ratio, simple structure, convenient control and high precision. It ensures the straightness and cylindricity of the cylinder bore during honing, thereby helping to improve the machining quality of the cylinder bore and the combustion efficiency of the internal combustion engine.

Description of drawings

Accompanying drawing 1 is the structural schematic diagram of the honing head for machining the cylinder bore of an internal combustion engine of the present invention;

Accompanying drawing 2 is the principle diagram of the hydraulic control system of the honing head for machining the cylinder bore of the internal combustion engine of the present invention;

Accompanying drawing 3 is the structure schematic diagram of the double-acting hydraulic cylinder of the internal combustion engine cylinder hole machining honing head of the present invention;

4 is a schematic structural diagram of the single-acting hydraulic cylinder of the honing head for machining the cylinder bore of an internal combustion engine according to the present invention.

In the picture: 1-input drive shaft, 2-cylinder, 3-groove, 4-piston, 5-convex key, 6-piston rod, 7-sealing ring, 8-single-acting hydraulic cylinder oil port, 9-oil stone Seat, 10-Expansion and contraction spring, 11-Whetstone, 12-Return spring, 13-Push rod, 14-Hone body, 15-Right oil port, 16-Left oil port, 17-Oil distribution plate, 18-Bearing, 19 -Hydraulic pump station, 20- one-way valve, 21- accumulator, 22- honing head axial motion control signal, 23- honing head rotary motion control signal, 24- oil stone radial expansion control signal, 25- three-position four Through electromagnetic reversing valve, 26-two-position four-way electromagnetic reversing valve, 27-two-position three-way electromagnetic reversing valve, 28-two-way hydraulic lock, 29-double-acting hydraulic cylinder, 30-variable hydraulic motor, 31-single Acting hydraulic cylinder, 32-tank.

Detailed ways

The technical solutions implemented by the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative achievements fall within the protection scope of the present invention.

As shown in FIG. 1 , a hydraulically driven honing head for machining a cylinder bore of an internal combustion engine includes an input transmission shaft 1 , a double-acting hydraulic cylinder 29 , a single-acting hydraulic cylinder 31 , an oil distribution plate 17 and a support bearing 18 .

As shown in FIG. 3 , the double-acting hydraulic cylinder 29 includes a cylinder block 2, the input drive shaft 1 is rigidly connected to the left end cover of the cylinder block 2, and the piston 4 in the cylinder block 2 divides the cylinder block 2 into two left and right working oil chambers. The right end cover of the hydraulic cylinder 29 has a right oil port 15 connected to the right working oil chamber, and the left end cover of the double-acting hydraulic cylinder 29 has a left oil port 16 connected to the left working oil chamber. The right end of the piston 4 is connected to one end of the piston rod 6. The piston rod 6. Complete the sealing between the right end cover of the double-acting hydraulic cylinder 29 and the piston rod 6 through the sealing ring 7. There are 3 rectangular grooves 3 evenly distributed on the inner cylindrical surface of the cylinder block 2, and the outer cylindrical surface of the piston 4 is distributed with 3 rectangular convexes. key5;

As shown in FIG. 4 , the single-acting hydraulic cylinder 31 is composed of a honing body 14, a push rod 13, a return spring 12, a whetstone seat 9, an expansion and contraction spring 10, and a whetstone 11. The honing body 14 is rigidly connected to the other end of the piston rod 6, and pushes the The left end of the rod 13 and the honing body 14 form a closed working oil chamber, the single-acting hydraulic cylinder oil port 8 is penetrated through the left end cover of the single-acting hydraulic cylinder 31 to connect the working oil chamber, and a return spring is installed between the right end of the push rod 13 and the right end of the honing body 14 12. The oil stone 11 is installed on the oil stone seat 9 through the expansion and contraction spring 10, and the oil stone seat 9 is installed in the oil stone seat groove evenly distributed in the circumferential direction of the single-acting hydraulic cylinder 31, and the two conical rotations on the outer surface of the push rod 13 The surface is closely matched with the conical surface on the inner circular surface of the oilstone seat 9;

The oil distribution plate 17 and the outer ring of the support bearing 18 are fixedly connected together, and are respectively fixed and installed on the left end cover and the right end cover of the double-acting hydraulic cylinder 29 and the left end cover of the single-acting hydraulic cylinder 31. There is an oil distribution groove on the oil distribution plate 17. A rotary friction pair is formed between the oil pan 17 and the end cover of the cylinder block, so that the rotary motion of the cylinder block 2 and the axial motion of the piston 4 can be realized while the oil is in and out.

As shown in FIG. 2 , in the embodiment of the present invention, a hydraulic circuit of a hydraulically driven internal combustion engine cylinder hole machining honing head is provided. The hydraulic pump station 19 provides the pressure of the working medium hydraulic oil in the hydraulic circuit, and the oil tank 32 stores the hydraulic oil and the oil to dissipate heat. According to the previous honing process requirements of the internal combustion engine cylinder hole, the honing hydraulic oil circuit includes the axial reciprocating oil circuit of the honing head, the rotary motion oil circuit of the honing head, and the radial expansion oil circuit of the oil stone. The three oil circuits work independently and do not interfere with each other.

The honing head axially reciprocates the oil circuit pressure oil through the hydraulic pump station 19 and enters the one-way valve 20. The one-way valve 20 in the oil circuit mainly prevents the backflow of the working circuit pressure oil, and the accumulator 21 can reduce the pressure in the oil circuit. impact to maintain the system pressure stability; the two-way hydraulic lock 28 between the three-position four-way electromagnetic reversing valve 25 and the double-acting hydraulic cylinder 29 is composed of two hydraulically controlled check valves in parallel, each check valve takes the other oil circuit When the three-position four-way electromagnetic reversing valve 25 is in the neutral position, the pilot pressure of the two one-way valves is equal, and the one-way valve is closed, so that the force of the left and right working oil chambers of the double-acting hydraulic cylinder 29 is balanced, and the piston 4 is fixed with the axial position of the honing head; when the honing head is fed axially, the axial motion control signal 22 of the honing head makes the right position of the three-position four-way electromagnetic reversing valve 25 energized, and the two-way hydraulic lock 28 is left hydraulically controlled one-way. The valve opens, and the pressure oil enters the oil through the left oil distribution plate 17 of the double-acting hydraulic cylinder 29 and the 8 left oil ports 16 evenly distributed on the left end cover of the double-acting hydraulic cylinder 29. The left working oil chamber is pressurized and the volume increases, pushing the piston 4 Move to the right, the oil in the right working oil chamber returns oil through the right oil port 15 of the double-acting hydraulic cylinder 29 and the right oil distribution plate 17, and the piston 4 drives the piston rod 6 and the honing body 14 rigidly connected to the piston rod 6 to move to the right, Complete the axial feed of the honing head. When the grinding head axial movement control signal 22 makes the left position of the three-position four-way electromagnetic reversing valve 25 energized, the two-way hydraulic lock 28 opens the right hydraulic control check valve, and the pressure oil passes through the double-acting hydraulic cylinder 29 and the right oil distribution plate 17 and The 8 right oil ports 15 evenly distributed on the right end cover of the double-acting hydraulic cylinder 29 enter oil, the right working oil chamber is pressurized, the volume increases, and the piston 4 is pushed to the left, and the left working oil chamber of the double-acting hydraulic cylinder 29 Left oil port 16 and the left oil distribution plate 17 return oil, the piston 4 drives the piston rod 6 and the honing body 14 rigidly connected to the piston rod 6 to move to the left, completes the axial retraction of the honing head, and completes the axial reciprocating motion of the honing head;

The normal position of the two-position four-way electromagnetic reversing valve 26 in the honing head rotary motion oil circuit is the right position, and each oil port is not connected to each other. When the honing head rotary motion control signal 23 is energized, the two-position four-way electromagnetic reversing valve 26 is left When working in position, the variable hydraulic motor 30 converts the pressure energy into rotational mechanical energy, and inputs the torque and rotational speed through the input drive shaft 1. The input drive shaft 1 is rigidly connected with the cylinder block 2, and the inner circular surface of the cylinder block 2 is evenly distributed 3 The three rectangular grooves are closely matched with the three rectangular convex keys evenly distributed on the outer surface of the piston 4. The piston 4 is rigidly connected with the piston rod 6 and the honing body 14, so that the torque and rotational speed input by the variable hydraulic motor 30 are transmitted to the honing body. 14, the honing head is driven to rotate, and the variable hydraulic motor 30 can adjust the output speed;

When the two-position three-way electromagnetic reversing valve 27 in the radial expansion oil circuit of the oilstone works in the left position, the pressure oil passes through the oil distribution plate 17 on the single-acting hydraulic cylinder 31 and the 8 evenly distributed single-acting hydraulic cylinders 31 on the left end cover of the single-acting hydraulic cylinder 31. The hydraulic cylinder oil port 8 enters oil, pushes the push rod 13 to move to the right, the axial movement of the push rod 13 is converted into the radial movement of the oil stone seat 9, the oil stone 11 expands, and the hydraulic pressure of the working oil chamber is converted into the honing of the oil stone 11. Working pressure, on the contrary, when the two-position three-way electromagnetic reversing valve 27 works in the right position, the oil in the working oil chamber of the single-acting hydraulic cylinder 31 is released through the oil port 8 of the single-acting hydraulic cylinder and the oil distribution plate 17 of the left end cover. 13 The return spring 12 moves to the left, the oilstone seat 9 retracts, and the oilstone releases pressure.

The standard components used in the present invention can be purchased from the market, the special-shaped parts can be calculated, designed and customized according to the description in the specification and the drawings, and the specific connection method of each part adopts the mature bolts, Conventional means such as rivets, welding, machinery, parts and equipment adopt the latest existing technical standards.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the appended claims. All changes within the meaning and range of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (6)

1. A honing head for machining a cylinder bore of a hydraulically driven internal combustion engine, characterized in that it comprises an input drive shaft (1), a double-acting hydraulic cylinder (29), a single-acting hydraulic cylinder (31), an oil distribution plate (17) and a support bearing (18); The double-acting hydraulic cylinder (29) includes a cylinder body (2), the input transmission shaft (1) is fixed on the left end cover of the cylinder body (2), and the piston (4) in the cylinder body (2) drives the cylinder body (2). 2) It is divided into two working oil chambers, left and right. The right end cover of the double-acting hydraulic cylinder (29) has a right oil port (15) running through it to connect to the right working oil chamber, and the left end cover of the double-acting hydraulic cylinder (29) has a left oil port running through it. (16) Connect the left working oil chamber, the right end of the piston (4) is connected to one end of the piston rod (6), and the piston rod (6) completes the sealing between the right end cover of the double-acting hydraulic cylinder and the piston rod (6) through the sealing ring (7). ; The single-acting hydraulic cylinder (31) is composed of a honing body (14), a push rod (13), a return spring (12), a whetstone seat (9), an expansion and contraction spring (10), and a whetstone (11). The body (14) is rigidly connected with the other end of the piston rod (6), the left end of the push rod (13) and the honing body (14) form a closed working oil cavity, and a single-acting hydraulic cylinder (31) runs through the left end cover of the single-acting hydraulic cylinder (31). The cylinder oil port (8) is connected to the working oil chamber, a return spring (12) is installed between the right end of the push rod (13) and the right end of the honing body (14), and the oil stone (11) is installed on the oil stone through the expansion and contraction spring (10). On the seat (9), the oilstone seat (9) is installed in the oilstone seat groove evenly distributed in the circumferential direction of the single-acting hydraulic cylinder (31), and the circumferential outer conical surface of the push rod (13) is connected to the oilstone seat (9). ) on the inner conical surface closely fit; The oil distribution plate (17) and the outer ring of the support bearing (18) are fixedly connected together, and are respectively installed on the left end cover and the right end cover of the double-acting hydraulic cylinder (29) and the left end cover of the single-acting hydraulic cylinder (31), and oil distribution A rotary friction pair is formed between the plate (17) and the end cover of the cylinder body, and an oil distribution groove is provided on the oil distribution plate (17). 2. The honing head for machining a cylinder hole of a hydraulically driven internal combustion engine according to claim 1, wherein the evenly distributed protruding keys (5) on the outer circumference of the piston (4) and the inner cylindrical surface of the cylinder (2) The evenly distributed grooves (3) on the upper part are tightly matched. 3. The honing head for machining a cylinder hole of a hydraulically driven internal combustion engine according to claim 2, wherein the grooves (3) are rectangular, and the number is 3, and the convex keys (5) are rectangular, and the number is 3. for 3. 4. The honing head for machining a cylinder bore of a hydraulically driven internal combustion engine according to claim 1, wherein the right oil port (15), the left oil port (16) and the single-acting cylinder oil port (8) have respectively 8. 5. A hydraulically driven internal combustion engine cylinder hole machining honing head according to any one of claims 1-4, characterized in that, there are two conical revolving surfaces and a whetstone on the outer circular surface of the push rod (13). The conical surface on the inner circular surface of the seat (9) forms a fit. 6. The hydraulic circuit of a honing head for machining a cylinder hole of a hydraulically driven internal combustion engine according to claim 1, characterized in that it comprises a honing head axial reciprocating oil circuit, a honing head rotary motion oil circuit, an oil stone radial expansion oil circuit, The three oil circuits are independently controlled, and the hydraulic pump station (19) provides the power source of the hydraulic circuit; The axial reciprocating oil circuit pressure oil of the honing head enters the check valve (20) through the hydraulic pump station (19), and the check valve (20) mainly prevents the backflow of the working circuit pressure oil in the oil circuit, and the accumulator ( 21) It can reduce the pressure shock in the oil circuit and maintain the system pressure stability; the two-way hydraulic lock (28) between the three-position four-way electromagnetic reversing valve (25) and the double-acting hydraulic cylinder (29) is composed of two hydraulic The control check valves are connected in parallel, and each check valve takes the pressure of the opposite oil circuit as the pilot pressure. When the three-position four-way electromagnetic reversing valve (25) is in the neutral position, the pilot pressures of the two check valves are equal, and the one-way The valve is closed to balance the forces between the left and right working oil chambers of the double-acting hydraulic cylinder (29), and the axial position of the piston (4) and the honing head is fixed; when the honing head is fed axially, the honing head axial movement control signal (22) Turn on the right position of the three-position four-way electromagnetic reversing valve (25), open the left hydraulic control check valve of the two-way hydraulic lock (28), and open the left oil port (16) on the left working oil chamber of the double-acting hydraulic cylinder (29). When oil enters, the left working oil chamber is pressurized, the volume increases, the piston (4) is pushed to the right, the right oil port (15) on the right working oil chamber returns oil, and the piston (4) drives the piston rod (6) to rigidly connect The honing body (14) on the piston rod (6) moves to the right to complete the axial feed of the honing head; the control signal (22) for the axial movement of the honing head makes the three-position four-way electromagnetic reversing valve (25) move to the left When the power is turned on, the right hydraulic control check valve of the two-way hydraulic lock (28) opens, and the right oil port (15) on the right working oil chamber of the double-acting hydraulic cylinder (29) enters oil, the right working oil chamber is pressurized, and the volume increases, Push the piston (4) to the left, the left oil port (16) on the left working oil chamber returns oil, and the piston (4) drives the piston rod (6) and the honing body (14) rigidly connected to the piston rod (6) to move toward the left. Move to the left to complete the axial retraction of the honing head and complete the axial reciprocating motion of the honing head; The normal state of the two-position four-way electromagnetic reversing valve (26) in the rotary motion oil circuit of the honing head is the right position. When the honing head rotary motion control signal (23) is energized, the two-position four-way electromagnetic reversing valve (26) is left When working in position, the variable hydraulic motor (30) converts the pressure energy into rotational mechanical energy, and transmits the torque and rotational speed to the honing body (14) through the input drive shaft (1) to drive the honing head to rotate; When the two-position three-way electromagnetic reversing valve (27) in the radial expansion oil circuit of the oil stone works in the left position, the single-acting cylinder oil port (8) on the working oil chamber of the single-acting hydraulic cylinder (31) enters oil, and pushes the pusher. The rod (13) moves to the right, the axial movement of the push rod (13) is converted into the radial movement of the oilstone seat (9), the oilstone (11) expands, and the hydraulic pressure of the working oil chamber is converted into the honing work of the oilstone (11). On the contrary, when the two-position three-way electromagnetic reversing valve (27) works in the right position, the working oil chamber of the single-acting hydraulic cylinder (31) releases the pressure and moves to the left under the action of the return spring (12) of the push rod (13). The seat (9) is retracted, and the oilstone is relieved of pressure.

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