CN210978051U - Energy-saving two-cylinder high-pressure plunger hydraulic cylinder - Google Patents

Abstract

The utility model relates to an energy-saving two-cylinder high-pressure plunger hydraulic cylinder. The technical scheme is as follows: the centerlines of the first oil chamber (9) and the second oil chamber (12) provided in the cylinder body (6) are parallel and located on the same plane, and the first oil chamber (9) and the second oil chamber (12) are parallel to each other. The open ends of the cavity (12) are in opposite directions. The first oil cavity (9) and the second oil cavity (12) are correspondingly provided with a first oil hole (10) and a second oil hole (15), and the first oil cavity (9) passes through the oil passage (13) and the second oil hole (15). The two oil cavities (12) communicate with each other, one end of the oil replenishment channel (14) communicates with the oil channel (13), and the other end of the oil replenishment channel (14) is connected to a pressure oil pipeline or a plug. The first oil cavity (9) is equipped with a first plunger body, and the second oil cavity (12) is equipped with a second plunger body. The diameter of the first plunger rod (1) is 0.8 to 0.9 times the diameter of the first plunger (3), and the cylindrical surface of the first plunger (3) is machined with 5 to 7 evenly distributed pressure equalizing grooves (20) , the first plunger body is the same as the second plunger body. The utility model has the advantages of simple structure, small volume, bidirectional pushing of heavy objects, low energy consumption, good sealing performance and fast frequency response.

Description

An energy-saving two-cylinder high-pressure plunger hydraulic cylinder

technical field

The utility model belongs to the technical field of hydraulic cylinders. In particular, it relates to an energy-saving two-cylinder high-pressure plunger hydraulic cylinder.

Background technique

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). When using it to realize reciprocating motion, the reduction device can be omitted, and there is no transmission gap, and the movement is stable, so it is widely used in some machine tools, construction machinery and metallurgical equipment.

At present, in machine tool equipment, construction machinery and metallurgical equipment, in order to realize the two-way action of the equipment, the double-acting piston hydraulic cylinder is generally used to realize the double-acting of the hydraulic cylinder (Chen Shankun. Application and Analysis of Telescopic Double-acting Hydraulic Cylinder in Hydraulic System. Hydraulic Pneumatic and Sealing, 2013 first issue), the movement of the double-acting piston hydraulic cylinder in both directions is driven by oil pressure, which greatly increases the energy consumption of the entire system, but the structure of the existing piston cylinder is complex, The sealing performance is also poor; and because the diameter of the piston rod is small relative to the diameter of the piston, when the piston hydraulic cylinder is overloaded and has a long stroke, the piston rod will be longitudinally bent and unstable, thus affecting the working life of the hydraulic cylinder.

At present, there are compound plunger cylinders that use two plunger hydraulic cylinders in pairs (Chen Kuisheng. Hydraulic and Pneumatic Transmission. Wuhan University of Technology Press, August 2001 first edition), each column of the compound plunger cylinder The plunger cylinder controls the movement in one direction, but the composite plunger cylinder is generally not used to push heavy objects in both directions, and the weight of the plunger is often large. The frequency response is also lower.

SUMMARY OF THE INVENTION

The utility model aims to overcome the above-mentioned technical defects, and aims to provide an energy-saving two-cylinder high-pressure plunger hydraulic cylinder with simple structure, small volume, bidirectional pushing of heavy objects, low energy consumption, good sealing performance and fast frequency response.

In order to achieve the above purpose, the technical solution adopted by the present invention is: the hydraulic cylinder includes a first plunger rod, a first plunger, a second plunger rod, a second plunger, a first cylinder cover, and a second cylinder cover and cylinder block.

The first plunger rod and the first plunger form a coaxially integrated first plunger body, and the second plunger rod and the second plunger form a coaxially integrated second plunger body.

The cylinder body is provided with a first oil cavity and a second oil cavity, the center lines of the first oil cavity and the second oil cavity are parallel to each other, and the two center lines are located on the same plane; the openings of the first oil cavity and the second oil cavity are The ends are arranged oppositely, the open end of the first oil chamber and the closed end of the second oil chamber are located on the same plane, and the first oil chamber and the second oil chamber are symmetrically arranged. The closed end of the first oil cavity is provided with a first oil hole in the radial direction, the closed end of the second oil cavity is provided with a second oil hole in the radial direction, and an oil passage is provided between the first oil cavity and the second oil cavity , one end of the oil passage is communicated with the open end of the first oil cavity, and the other end of the oil passage is communicated with the open end of the second oil cavity; the cylinder body is provided with an oil supply channel, and one end of the oil supply channel is connected with the oil channel The other end of the oil supply channel is connected to a pressure oil pipeline or a plug.

The first oil cavity of the cylinder body is equipped with a first plunger body, the open end of the first oil cavity is fixedly connected with the first cylinder head by bolts, and the first plunger rod of the first plunger body is connected from the center of the first cylinder head The second oil cavity of the cylinder body is equipped with a second plunger body, the open end of the second oil cavity and the second cylinder cover are fixedly connected by bolts, and the second plunger rod of the second plunger body is connected from the second The center hole of the cylinder head is pierced.

A piston rod sealing groove is arranged in the middle of the hole wall of the center hole of the first cylinder cover, and the piston rod sealing groove is equipped with a sealing ring; the inner end face of the first cylinder head is provided with an oil cavity sealing groove, and the oil cavity sealing groove is equipped with a sealing ring. The second cylinder head has the same shape, structure and size as the first cylinder head.

The diameter of the first plunger rod is 0.8 to 0.9 times the diameter of the first plunger, and the surface of the first plunger cylinder is machined with 5 to 7 evenly distributed pressure equalizing grooves; the first plunger rod and the second plunger rod The same, the first plunger is the same as the second plunger.

The plane shape of the first cylinder head is the same as the shape of the open end face of the first oil chamber of the cylinder block, the thickness of the first cylinder head is the same as the thickness of the closed end of the first oil chamber of the cylinder block, and the central hole of the first cylinder head The diameter of the first cylinder head is the same as the nominal size of the diameter of the first plunger rod, and the center of the first cylinder head is symmetrically provided with 4 to 8 bolt holes.

The end face of the first oil cavity of the cylinder body is provided with 4-8 first cylinder head screw holes, and the distribution of the 4-8 first cylinder head screw holes is the same as the distribution of the 4-8 bolt holes of the first cylinder head The same; the end face of the second oil cavity of the cylinder block is provided with 4 to 8 second cylinder head screw holes, and the distribution of 4 to 8 second cylinder head screw holes is the same as the distribution of 4 to 8 bolt holes of the second cylinder head same.

The cross section of the pressure equalizing groove is a trapezoid, and the trapezoid has a width of 1-1.4 mm at the upper part, a width of 0.8-1.2 mm at the bottom, and a depth of 0.8-1 mm.

Owing to adopting the above-mentioned technical scheme, the utility model has the following advantages:

1. The cylinder of the present invention is symmetrically provided with two identical oil cavities, and the two identical oil cavities are respectively provided with two identical plungers and plunger rods, and the plunger rods pass through the respective cylinder heads, The oil passage communicated with the two oil cavities is communicated with the oil replenishing passage, and the bidirectional double cylinder formed is simple in structure and small in volume.

2. The utility model is provided with an oil supply channel which communicates with the oil channel. When the oil supply channel is blocked with a plug, the two oil cylinders can push the working mechanism to reciprocate or swing in both directions, so that the two piston rods can be pushed in both directions. Heavy objects; when the plug is removed, the pressure oil pipeline is connected and the oil hole of one of the oil cylinders is cut off, the injected pressure oil can make the other oil cylinder work alone. Because the utility model can work both with two cylinders and with a single cylinder, and the inner wall of the cylinder body is relatively thick, the utility model has the characteristics of high pressure resistance.

3. The utility model uses the first oil hole as the oil inlet to introduce pressure oil to push the first plunger and the first plunger rod to the left, and the hydraulic oil flows into the second oil cavity through the oil passage, so that the second plunger and the first plunger The second plunger rod retracts to the left, and the hydraulic oil finally flows out through the second oil hole; if the hydraulic oil flows in through the second oil hole and flows out from the first oil hole, the second plunger and the second plunger rod extend to the right , the first plunger and the first plunger rod are retracted to the right, so that the other plunger and the other plunger rod do not need to be fed with additional hydraulic oil to return the other plunger and the other plunger rod, thereby achieving the effect of saving energy, which is an energy saving Type combination plunger cylinder.

4. The double plunger structure of the same cylinder body adopted by the present invention, the diameter of each plunger rod is 0.8 to 0.9 times the diameter of the corresponding plunger, and the diameter of the plunger rod is close to the diameter of the plunger, so the plunger rod It has strong bending resistance and is suitable for high pressure and heavy load; compared with the double-acting piston hydraulic cylinder, the utility model is smaller in size and lighter in weight.

4. The outer surface of the plunger used in the present invention is machined with 5 to 7 pressure equalizing grooves that are evenly distributed. The cross section of the pressure equalizing groove is trapezoidal, which is conducive to oil storage. Friction between plunger and cylinder. The gap sealing structure makes the oil film exist in the gap between the cylinder block and the plunger, and it is relatively uniform, so that the plunger can keep the eccentricity, reduce the leakage, and facilitate the rapid movement of the plunger, so that the frequency response is fast.

Therefore, the utility model has the characteristics of simple structure, small size, bidirectional pushing of heavy objects, low energy consumption, good sealing performance and fast frequency response, is suitable for high pressure and heavy load, and can be widely used in machine tools, metallurgical machinery, engineering machinery, Military industries, etc. require hydraulic equipment such as reciprocating motion, stepping and swinging.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model;

FIG. 2 is a schematic structural diagram of the cylinder block 6 shown in FIG. 1;

FIG. 3 is a schematic front view of the first cylinder head 2 shown in FIG. 1;

FIG. 4 is a left side schematic view of the first cylinder head 2 shown in FIG. 3;

5 is a schematic structural diagram of a first plunger body formed by the first plunger rod 1 and the first plunger 3 shown in FIG. 1;

Fig. 6 is the partial enlarged schematic diagram of I of the first plunger 1 in Fig. 1;

Fig. 7 is the A-A sectional schematic diagram in Fig. 1;

FIG. 8 is a schematic cross-sectional view taken along line B-B in FIG. 1 .

Detailed ways

The present utility model will be further described below with reference to the accompanying drawings and specific embodiments, which are not intended to limit the protection scope of the present utility model.

Example 1

An energy-saving two-cylinder high-pressure plunger hydraulic cylinder. As shown in FIG. 1, the hydraulic cylinder includes a first plunger rod 1, a first plunger 3, a second plunger rod 4, a second plunger 7, a first cylinder head 2, a second cylinder head 5 and a cylinder body 6.

As shown in FIG. 1 , the first plunger rod 1 and the first plunger 3 constitute a first plunger body integrally coaxial, and the second plunger rod 4 and the second plunger 7 constitute a second coaxial integral whole. plunger body.

As shown in FIG. 2, FIG. 7 and FIG. 8, the cylinder 6 is provided with a first oil chamber 9 and a second oil chamber 12. The centerlines of the first oil chamber 9 and the second oil chamber 12 are parallel to each other. The center lines are on the same plane; the open ends of the first oil chamber 9 and the second oil chamber 12 are oppositely arranged, the open end of the first oil chamber 9 and the closed end of the second oil chamber 12 are on the same plane, and the first oil chamber 9 and the second oil chamber 12 are on the same plane. The second oil chambers 12 are symmetrically arranged. The closed end of the first oil chamber 9 is provided with a first oil hole 10 in the radial direction, the closed end of the second oil chamber 12 is provided with a second oil hole 15 in the radial direction, the first oil chamber 9 and the second oil chamber 12 is provided with an oil passage 13, one end of the oil passage 13 communicates with the open end of the first oil cavity 9, and the other end of the oil passage 13 communicates with the open end of the second oil cavity 12; An oil supplement channel 14, one end of the oil supplement channel 14 communicates with the oil passage 13, and the other end of the oil supplement channel 14 is connected to a pressure oil pipeline or a plug.

As shown in FIGS. 1 and 2 , the first oil chamber 9 of the cylinder block 6 is equipped with a first plunger body, the open end of the first oil chamber 9 is fixedly connected with the first cylinder head 2 by bolts, and the first plunger body The first plunger rod 1 protrudes from the central hole of the first cylinder head 2; the second oil cavity 12 of the cylinder block 6 is equipped with a second plunger body, and the open end of the second oil cavity 12 is connected to the second cylinder head 5 The second plunger rod 4 of the second plunger body passes through the central hole of the second cylinder head 5 through bolted connection.

As shown in FIGS. 3 and 4 , a piston rod sealing groove 19 is provided at the center of the hole wall of the central hole 17 of the first cylinder head 2 , and a sealing ring is installed in the piston rod sealing groove 19 ; the inner end face of the first cylinder head 2 An oil cavity sealing groove 18 is provided, and the oil cavity sealing groove 18 is provided with a sealing ring. The second cylinder head 5 has the same shape, structure and size as the first cylinder head 2 .

As shown in FIG. 5 and FIG. 6 , the diameter of the first plunger rod 1 is 0.8 to 0.85 times the diameter of the first plunger 3 , and the cylindrical surface of the first plunger 3 is machined with five evenly distributed pressure equalizing grooves 20 ; The first plunger rod 1 and the second plunger rod 4 are the same, and the first plunger 3 and the second plunger 7 are the same.

As shown in FIGS. 3 and 4 , the plane shape of the first cylinder head 2 is the same as the shape of the open end face of the first oil chamber 9 of the cylinder block 6 ; as shown in FIGS. 1 and 4 , the first cylinder head 2 The thickness is the same as the thickness of the closed end of the first oil chamber 9 of the cylinder block 6, the diameter of the central hole 17 of the first cylinder head 2 is the same as the nominal size of the diameter of the first plunger rod 1, and the center of the first cylinder head 2 is symmetrical. 6 bolt holes 16 are provided.

As shown in FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the end face of the first oil chamber 9 of the cylinder block 6 is provided with six first cylinder head screw holes 8 and six first cylinder head screw holes 8 The distribution is the same as the distribution of the six bolt holes of the first cylinder head 2; the end face of the second oil cavity 12 of the cylinder block 6 is provided with six second cylinder head screw holes 11, and the six second cylinder head screw holes 11 The distribution is the same as the distribution of the 6 bolt holes of the second cylinder head 5 .

As shown in FIG. 6 , the cross section of the pressure equalizing tank 20 is a trapezoid, and the trapezoid has a width of 1-1.4 mm at the top, a width of 0.8-1.2 mm at the bottom, and a depth of 0.8-1 mm.

Example 2

An energy-saving two-cylinder high-pressure plunger hydraulic cylinder. Except the following technical parameters, all the other are the same as in Example 1:

The diameter of the first plunger rod 1 is 0.85-0.9 times the diameter of the first plunger 3, and the cylindrical surface of the first plunger 3 is machined with 6 or 7 evenly distributed pressure equalizing grooves 20;

The first cylinder head 2 is provided with 4-5 or 7-8 bolt holes 16 symmetrically in the center.

The end face of the first oil cavity 9 of the cylinder block 6 is provided with 4 to 5 or 7 to 8 first cylinder head screw holes 8, and the distribution of the 4 to 5 or 7 to 8 first cylinder head screw holes 8 is the same as that of the first cylinder head screw holes 8. The distribution of 4-5 or 7-8 bolt holes of the first cylinder head 2 is the same; the end face of the second oil chamber 12 of the cylinder block 6 is provided with 4-5 or 7-8 second cylinder head screw holes 11, 4 The distribution of the 5 or 7 to 8 second cylinder head screw holes 11 is the same as the distribution of the 4 to 5 or 7 to 8 bolt holes of the second cylinder head 5 .

Compared with the prior art, this specific embodiment has the following advantages:

1. Two identical oil cavities are symmetrically arranged in the cylinder body 6 of this specific embodiment, and two identical oil cavities are respectively provided with two identical plungers and plunger rods, and the plunger rods pass through the respective cylinder heads. Out, the oil passage 13 communicated with the two oil cavities is communicated with the oil supply passage 14, and the bidirectional double cylinder formed is simple in structure and small in volume.

2. This specific embodiment is provided with an oil supply channel 14 that communicates with the oil passage 13. When the oil supply channel 14 is blocked with a plug, the two oil cylinders can push the working mechanism to reciprocate or swing in both directions, thereby making the two pistons. The rod can push the heavy objects in both directions; when the plug is taken out, the pressure oil pipeline is connected and the oil hole of one of the oil cylinders is cut off, the injected pressure oil can make the other oil cylinder work alone. Since this specific embodiment can work both with a double cylinder and a single cylinder, and the inner wall of the cylinder is relatively thick, the specific embodiment has the characteristics of high pressure resistance.

3. In this specific embodiment, the first oil hole 10 is used as the oil inlet to enter the pressure oil to push the first plunger 3 and the first plunger rod 1 to the left, and the hydraulic oil flows into the second oil cavity 12 through the oil passage 13, so that the The second plunger 7 and the second plunger rod 4 are retracted to the left, and the hydraulic oil finally flows out through the second oil hole 15; if the hydraulic oil flows in through the second oil hole 15 and flows out from the first oil hole 10, the second column The plunger 7 and the second plunger rod 4 are extended to the right, and the first plunger 3 and the first plunger rod 1 are retracted to the right, so that the other plunger and the other rod do not need to be fed with hydraulic oil. The plunger rod returns to achieve the effect of saving energy. It is an energy-saving combined plunger cylinder.

4. The double plunger structure of the same cylinder body adopted in this specific embodiment, the diameter of each plunger rod is 0.8 to 0.9 times the diameter of the corresponding plunger, and the diameter of the plunger rod is close to the diameter of the plunger, so the plunger The rod has strong bending resistance and is suitable for high pressure and heavy load; compared with the double-acting piston hydraulic cylinder, the specific embodiment is smaller in size and lighter in weight.

4. The outer surface of the plunger used in this specific embodiment is machined with 5 to 7 evenly distributed pressure equalizing grooves, and the cross section of the pressure equalizing groove is trapezoidal, which is conducive to oil storage. Reduced friction between plunger and cylinder. The gap sealing structure makes oil film exist in the gap between the cylinder block 6 and the plunger, and it is relatively uniform, so that the plunger can remain uneccentric, reduce the leakage, facilitate the rapid movement of the plunger, and thus the frequency response is fast.

Therefore, this specific embodiment has the characteristics of simple structure, small size, bidirectional pushing of heavy objects, low energy consumption, good sealing performance and fast frequency response, suitable for high pressure and heavy load, and can be widely used in machine tools, metallurgical machinery, construction machinery , military and other hydraulic equipment that requires reciprocating motion, stepping and swinging.

Claims (4)

1. An energy-saving two-cylinder high-pressure plunger hydraulic cylinder is characterized by comprising a first plunger rod (1), a first plunger (3), a second plunger rod (4), a second plunger (7), a first cylinder cover (2), a second cylinder cover (5) and a cylinder body (6);

the first plunger rod (1) and the first plunger (3) form a first plunger body which is coaxial and integral, and the second plunger rod (4) and the second plunger (7) form a second plunger body which is coaxial and integral;

the cylinder body (6) is provided with a first oil chamber (9) and a second oil chamber (12), the center lines of the first oil chamber (9) and the second oil chamber (12) are parallel to each other, and the two center lines are positioned on the same plane; the open ends of the first oil chamber (9) and the second oil chamber (12) are arranged oppositely, the open end of the first oil chamber (9) and the closed end of the second oil chamber (12) are positioned on the same plane, and the first oil chamber (9) and the second oil chamber (12) are symmetrically arranged; a first oil hole (10) is formed in the closed end of the first oil cavity (9) along the radial direction, a second oil hole (15) is formed in the closed end of the second oil cavity (12) along the radial direction, an oil channel (13) is arranged between the first oil cavity (9) and the second oil cavity (12), one end of the oil channel (13) is communicated with the end, close to the opening, of the first oil cavity (9), and the other end of the oil channel (13) is communicated with the end, close to the opening, of the second oil cavity (12); the cylinder body (6) is provided with an oil supplementing channel (14), one end of the oil supplementing channel (14) is communicated with the oil duct (13), and the other end of the oil supplementing channel (14) is externally connected with a pressure oil duct or a plug;

a first plunger body is arranged in a first oil cavity (9) of the cylinder body (6), the open end of the first oil cavity (9) is fixedly connected with the first cylinder cover (2) through a bolt, and a first plunger rod (1) of the first plunger body penetrates out of a center hole of the first cylinder cover (2); a second piston body is arranged in a second oil chamber (12) of the cylinder body (6), the open end of the second oil chamber (12) is fixedly connected with a second cylinder cover (5) through a bolt, and a second piston rod (4) of the second piston body penetrates out of a central hole of the second cylinder cover (5);

a piston rod sealing groove (19) is arranged in the middle of the hole wall of a central hole (17) of the first cylinder cover (2), and a sealing ring is arranged in the piston rod sealing groove (19); an oil cavity sealing groove (18) is formed in the end face of the inner side of the first cylinder cover (2), and a sealing ring is arranged in the oil cavity sealing groove (18); the shape, structure and size of the second cylinder cover (5) are the same as those of the first cylinder cover (2);

the diameter of the first plunger rod (1) is 0.8-0.9 times of that of the first plunger (3), and 5-7 uniformly distributed pressure equalizing grooves (20) are formed in the surface of the cylinder of the first plunger (3); the first plunger rod (1) is identical to the second plunger rod (4), and the first plunger (3) is identical to the second plunger (7).

2. The energy-saving two-cylinder high-pressure plunger hydraulic cylinder as claimed in claim 1, characterized in that the planar shape of the first cylinder cover (2) is the same as the open end face shape of the first oil chamber (9) of the cylinder body (6), the thickness of the first cylinder cover (2) is the same as the closed end thickness of the first oil chamber (9) of the cylinder body (6), the diameter of the central hole (17) of the first cylinder cover (2) is the same as the nominal size of the diameter of the first plunger rod (1), and the first cylinder cover (2) is centrally symmetrically provided with 4-8 bolt holes (16).

3. The energy-saving two-cylinder high-pressure plunger hydraulic cylinder as claimed in claim 1, characterized in that the end surface of the first oil chamber (9) of the cylinder body (6) is provided with 4-8 first cylinder head screw holes (8), and the distribution of the 4-8 first cylinder head screw holes (8) is the same as the distribution of the 4-8 bolt holes of the first cylinder head (2); the end face of a second oil cavity (12) of the cylinder body (6) is provided with 4-8 second cylinder cover screw holes (11), and the distribution of the 4-8 second cylinder cover screw holes (11) is the same as that of the 4-8 bolt holes of the second cylinder cover (5).

4. An energy saving two cylinder high pressure ram hydraulic cylinder according to claim 1, characterised in that the cross section of the pressure equalizing groove (20) is trapezoidal, the trapezoidal: the width of the upper part is 1-1.4 mm, the width of the bottom part is 0.8-1.2 mm, and the depth is 0.8-1 mm.

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