Novel clutch type servo electro-hydraulic cylinder

Abstract

The invention belongs to the technical field of electro-hydraulic cylinders, and particularly relates to a novel clutch type servo electro-hydraulic cylinder which comprises a working cylinder barrel, a working piston arranged in the working cylinder barrel and an oil storage barrel communicated with the working cylinder barrel. The main transmission part is arranged at the output end of the motor, the driven part is connected with the main transmission part, and the first clutch and the second clutch are arranged on the two sides of the driven part respectively, connected with the driven part and driven by the driven part. The oil pump is connected with the second clutch; the first clutch is connected with the working piston and drives the working piston to reciprocate in the working cylinder barrel; the oil pump is used for pumping hydraulic oil in the oil storage barrel into the working cylinder barrel; compared with an electro-hydraulic cylinder in the prior art, the electro-hydraulic cylinder adopts one servo motor to drive the working piston and the oil pump, the machining precision is improved, meanwhile, the material cost of the electro-hydraulic cylinder is saved, and the size of the electro-hydraulic cylinder is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric hydraulic cylinders, and in particular to an electric hydraulic cylinder which realizes the driving and pressurizing processes of a working piston through a same servo motor. Background Art

[0002] At present, the common booster cylinder uses gas and liquid as the medium to push the working piston to move and finally realize the boosting process, that is, the working mode of the gas-liquid booster cylinder. This mode can meet some processing requirements, that is, it can be used for scenes with low processing accuracy requirements. The so-called processing accuracy includes the position accuracy of the working piston movement and the force accuracy of the boosting process. The working piston is connected to the working rod; its cost is low, but the scope of application is limited, that is, it is not applicable to processing scenes with high precision requirements. In order to increase the processing accuracy of the booster cylinder so as to meet the processing scenes with special requirements for accuracy, the current common method is to use a servo motor to replace the gas-liquid drive of the gas-liquid booster cylinder, that is, the current common electro-hydraulic booster cylinder, which is equipped with two servo motors to control the movement of the booster rod and the working piston respectively. The use of servo motor drive can significantly improve the position accuracy of the booster rod and the working piston (working rod) movement, and can accurately control the force of the boosting process. However, the use of two servo motors not only greatly increases the material cost of the booster cylinder, but also greatly increases the volume of the booster cylinder, and requires a high installation space. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention aims to provide a novel clutch-type servo electro-hydraulic cylinder, which realizes the driving and pressurizing process of the working piston through a servo motor, has a simple structure and low cost.

[0004] To achieve the above-mentioned purpose, the technical solution is: a new type of clutch servo electric hydraulic cylinder, including a working cylinder and a working piston arranged therein, and an oil storage cylinder connected to the working cylinder; it also includes a motor, a main transmission member arranged at the output end of the motor, a driven member connected to the main transmission member, a first clutch and a second clutch respectively arranged on both sides of the driven member and connected to and driven by the driven member; an oil pump connected to the second clutch; the first clutch is connected to the working piston and drives it to reciprocate in the working cylinder; the oil pump is used to draw the hydraulic oil in the oil storage cylinder into the working cylinder.

[0005] Preferably, the motor is a servo motor, the main transmission member arranged at the output end thereof is a driving synchronous wheel; the driven member is a synchronous wheel; the driving synchronous wheel and the driven member are connected by a synchronous belt.

[0006] Furthermore, an upper end cover is provided at the upper end of the working cylinder, and a bracket for installing an oil pump is provided on the upper end cover; the first clutch, the driven member, and the second clutch are stacked and installed on the upper end cover, and the second clutch is located below the oil pump; an oil lower cover is provided at the lower end of the oil storage cylinder and is connected to its interior.

[0007] Preferably, the first clutch and the second clutch are electromagnetic clutches or pneumatic clutches, and the two have the same structure, both of which include a clutch active member fixedly connected to and coaxially arranged with the driven member, a clutch driven member, a clutch support member, and an adapter member inserted into the axial hole of the clutch driven member and rotating synchronously therewith; the clutch driven member can move axially along the adapter member to achieve the engagement and separation of the clutch active member and the clutch driven member.

[0008] The oil pump is a gear pump, a plunger pump or a vane pump. The power input shaft arranged at one end of the oil pump is inserted into the axial hole of the adapter of the second clutch, and the power input shaft rotates synchronously with the adapter.

[0009] It also includes a screw rod, the upper end of which passes through the axial hole of the adapter of the first clutch and extends into the clutch active part above the adapter; the screw rod rotates synchronously with the adapter; the working piston is sleeved on the screw rod and moves axially along the working cylinder barrel as the screw rod rotates.

[0010] Plane teeth are arranged on the surfaces of the clutch active member and the clutch driven member that contact each other.

[0011] It also includes an oil inlet pipe, one end of which is connected to the interior of the oil lower cover and the other end is connected to the oil pump; and an oil outlet pipe, one end of which is connected to the oil pump and the other end is connected to the interior of the upper end cover, and the connection position between the oil outlet pipe and the working cylinder is located above the working piston.

[0012] The lower oil cover is provided with a longitudinal through hole connected to the inside of the oil storage cylinder and a transverse oil hole connected to the longitudinal through hole; the upper end cover is provided with a transverse oil inlet hole whose two ends are respectively connected to the working cylinder barrel and the transverse oil hole.

[0013] It further includes a switch valve, which is fixed at the lower end of the oil lower cover and inserted into the longitudinal through hole when its valve stem extends upward to close the channel for the hydraulic oil in the oil storage cylinder to enter the transverse oil hole; the channel is opened when the valve stem retracts.

[0014] Technical effect: The electric hydraulic cylinder of the present invention adopts a servo motor connected with the first clutch and the second clutch respectively through a follower. The servo motor and the follower can be connected by belt drive, gear drive and the like, that is, the follower can be a driven synchronous wheel, a driven gear and the like; the follower distributes the power of the servo motor outwards through two clutches respectively arranged on both sides thereof, the two clutches here are respectively connected with an oil pump and a screw rod, a working piston and a working rod coaxial and fixedly connected thereto are sleeved on the screw rod, and the oil pump is used to draw the hydraulic oil of the oil storage cylinder into the working cylinder barrel; when working, the servo motor is started, and the clutch active part and the clutch driven part of the first clutch connected to the screw rod are combined, the servo motor drives the screw rod to rotate through the follower and the first clutch, and the working piston and the working rod When the hydraulic oil in the oil storage cylinder moves downward, it enters the working cylinder and is located above the working piston. At this time, the clutch active part and clutch driven part of the second clutch connected to the oil pump can be combined or separated. If the clutch active part and clutch driven part of the clutch are combined, the hydraulic oil can be synchronously pumped into the space above the working piston in the working cylinder, which is conducive to increasing the downward speed of the working piston and the working rod. When the working piston and the working rod descend to the predetermined position of the mold closing, the speed of the servo motor decreases. After the mold closing is completed, it enters the pressurization stage. At this time, the clutch active part and clutch driven part of the first clutch are separated, and the clutch active part and clutch driven part of the second clutch are combined. The speed of the servo motor increases, the oil pump is started, and the hydraulic oil is pumped into the space above the working piston in the working cylinder to complete the pressurization process. Compared with the electric hydraulic cylinder in the prior art, the electric hydraulic cylinder of the present invention adopts a servo motor to drive the working piston and the oil pump. While improving the processing accuracy, it saves the material cost of the electric hydraulic cylinder and reduces the volume of the electric hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an electric hydraulic cylinder according to an embodiment of the present invention;

[0016] Figure 2 It is a front view of the electric hydraulic cylinder according to an embodiment of the present invention;

[0017] Figure 3 It is a right side view of the electric hydraulic cylinder according to an embodiment of the present invention;

[0018] Figure 4 for Figure 3 A partial enlarged view of

[0019] Figure 5 It is a left side view of the electric hydraulic cylinder according to an embodiment of the present invention;

[0020] Figure 6 A first cross-sectional view of an electric hydraulic cylinder according to an embodiment of the present invention;

[0021] Figure 7 for Figure 6A partial enlarged view of

[0022] Figure 8 for Figure 6 Another partial enlarged view of;

[0023] Fig. 9 This is a second cross-sectional view of the electric hydraulic cylinder according to an embodiment of the present invention.

[0024] Marking description: working cylinder-1, working piston-2, oil storage cylinder-3, motor-4, driven part-5, first clutch-6, second clutch-7, clutch active part-671, clutch driven part-672, clutch support part-673, adapter part-674, spring-675, oil pump-8, main transmission part-9, synchronous belt-10, upper end cover-11, lateral oil inlet hole-1101, bracket-12, lower oil cover-13, lateral oil hole-1301, screw-14, flat gear-15, oil inlet pipe-16, oil outlet pipe-17, switch valve-18, valve stem-1801, working rod-19, power input shaft-20. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0026] like Figure 1 , Figure 6 As shown, an embodiment of the present invention provides a new clutch servo electric hydraulic cylinder, which realizes precise control of the moving position of the working piston and the pressurization process through a servo motor; it includes a working cylinder 1 and a working piston 2 arranged therein, and like the existing electric hydraulic cylinder, it also includes a working rod 19 at one end which is perpendicular to and fixedly connected to the working piston, and one end of the working rod 19 is located outside the working cylinder 1; an oil storage cylinder 3 connected to the working cylinder; it also includes a motor 4, a main transmission member 9 arranged at the output end of the motor, a driven member 5 connected to the main transmission member, a first clutch 6 and a second clutch 7 which are respectively arranged on both sides of the driven member and are connected to and driven by the driven member; an oil pump 8 connected to the second clutch; the first clutch is connected to the working piston 2 and drives it to reciprocate in the working cylinder 1, that is, through the forward or reverse rotation of the motor 4, the working piston 2 is driven to reciprocate in the working cylinder 1; the oil pump is used to pump the hydraulic oil in the oil storage cylinder 3 into the working cylinder 1.

[0027] like Figure 1-3 As shown, an upper end cover 11 is provided at the upper end of the working cylinder 1, and a bracket 12 for mounting an oil pump 8 is provided on the upper end cover; the first clutch 6, the driven member 5, and the second clutch 7 are stacked and mounted on the upper end cover, and the second clutch is located below the oil pump 8; an oil lower cover 13 connected to the interior of the oil storage cylinder 3 is provided at the lower end.

[0028] like Figure 1-3 As shown, in order to connect the oil pump and the oil storage cylinder, it also includes an oil inlet pipe 16, one end of which is connected to the interior of the oil lower cover 13, and the other end is connected to the oil pump 8; and an oil outlet pipe 17 for connecting the oil pump and the upper end cover (working cylinder), one end of which is connected to the oil pump 8, and the other end is connected to the interior of the upper end cover 11, and the connection position between the oil outlet pipe and the working cylinder is located above the working piston 2.

[0029] In the present embodiment, the motor 4 adopts a servo motor. Obviously, the main transmission member 9 and the driven member 5 provided at the output end of the servo motor here can be connected by mechanical transmission methods such as belt transmission, gear transmission, sprocket transmission, worm gear, etc., that is, the driven member 5 here can be a driven synchronous wheel, a driven gear, a sprocket, a worm gear, etc.; this embodiment only takes the synchronous wheel as the driven member as an example for explanation, but does not mean that the main transmission member and the driven member can only be driven by a synchronous belt; for this reason, a main transmission member 9 is provided at the output end of the motor 4; the active synchronous wheel (main transmission member) and the driven member 5 are connected by a synchronous belt 10.

[0030] like Figure 1-6 , Figure 8 As shown, in this embodiment, the first clutch 6 and the second clutch 7 are electromagnetic clutches or pneumatic clutches. In order to save costs, two clutches with the same structure are used, and the pneumatic clutch is used as an example for explanation; here, in order to save space, the composition of the first clutch 6 and the second clutch 7 is no longer described separately; the first clutch 6 and the second clutch 7 both include a clutch active member 671 fixedly connected to the driven member 5 and coaxially arranged, a clutch driven member 672, a clutch support member 673 and an adapter member 674 inserted in the axial hole of the clutch driven member and rotating synchronously therewith; that is, the clutch active member 671, the clutch driven member 672, the clutch The central axis of the support member 673, the adapter member 674, and the driven member 5 coincide with each other; and when the clutch driven member 672 rotates, the adapter member 674 rotates accordingly, and the two can achieve synchronous rotation by means of gear meshing, that is, an inner tooth portion is provided on the inner wall of the clutch driven member 672, and an outer tooth portion is provided on the outer wall of the adapter member 674 (not shown); one end of the clutch active member 671 here is inserted into the axial hole of the driven member 5, and the clutch active member and the driven member can be radially connected by a key to keep the two rotating synchronously; the clutch driven member 672 can move along the axial direction of the adapter member to achieve the combination and separation of the clutch active member 671 and the clutch driven member. Figure 8As shown, a plurality of springs 675 are further provided in the clutch follower 672, one end of which abuts against the setting plane in the clutch follower, and the other end abuts against a step surface on the adapter 674. When a certain pressure of gas is introduced from the air hole 673a of the clutch support 673, the clutch follower 672 moves along the adapter 674 and fits with the clutch active member 671. At this time, the clutch active member 671 and the clutch follower 672 rotate at the same time, and the spring 675 is compressed; when the input gas stops, the spring 675 resets, so that the clutch active member 671 and the clutch follower 672 can be separated, that is, the spring here has a reset function.

[0031] like Figure 6 , Figure 8 As shown, the oil pump 8 can adopt a gear pump, a plunger pump or a vane pump. The power input shaft 20 arranged at one end of the oil pump is inserted into the axial hole of the adapter 674 of the second clutch 7 and the power input shaft rotates synchronously with the adapter, that is, when the adapter 674 rotates, the power input shaft 20 rotates accordingly.

[0032] like Figure 6 , Figure 8 As shown, in order to drive the working piston 2 and the working rod 19 to move up and down, it also includes a screw rod 14, the upper end of which passes through the axial hole of the adapter 674 of the first clutch 6 and extends into the clutch active member 671 above the adapter; the screw rod 14 rotates synchronously with the adapter 674; the working piston 2 and the working rod 19 are sleeved on the screw rod 14 and the two move axially along the working cylinder 1 as the screw rod rotates, that is, when the motor 4 rotates forward, the two move downward, and when it rotates reversely, the two move upward.

[0033] like Figure 3-4 As shown, the surfaces of the clutch active member 671 and the clutch driven member 672 that contact each other are both provided with a flat tooth portion 15. After the motor 4 is started, the clutch active members 671 on the two clutches rotate synchronously with the driven member 5; at this time, if it is necessary to drive the screw rod 14 to rotate, the clutch driven member 672 of the first clutch 6 moves upward and combines with the corresponding clutch active member 671, the flat tooth portion on the clutch driven member 672 meshes with the flat tooth portion 15 on the clutch active member 671, and the clutch driven member rotates synchronously therewith, thereby driving the screw rod 14 to rotate; if it is necessary to start the oil pump 8, the clutch driven member 672 of the second clutch 7 moves downward and combines with the corresponding clutch active member 671, similarly, the flat tooth portions 15 on the two meshes, and the clutch driven member rotates synchronously therewith, thereby driving the power input shaft 20 to rotate, and the oil pump is started accordingly, and the hydraulic oil in the oil storage barrel 3 is pumped into the working cylinder barrel 1.

[0034] like Figure 7 , 9As shown, the oil lower cover 13 is provided with a longitudinal through hole connected to the inside of the oil storage cylinder and a transverse oil hole 1301 connected to the longitudinal through hole; the upper end cover 11 is provided with a transverse oil inlet hole 1101 whose two ends are respectively connected to the working cylinder barrel 1 and the transverse oil hole.

[0035] In order to switch the passage between the longitudinal through hole and the transverse oil hole, a switch valve 18 is further included, which is fixed to the lower end of the oil lower cover 13 and its valve stem 1801 is inserted into the longitudinal through hole when it is extended upward to close the passage for the hydraulic oil in the oil storage cylinder to enter the transverse oil hole 1301; the passage is opened when the valve stem is retracted.

[0036] In summary, by adopting the above structure, a servo motor can be used to drive the working piston 2 and the working rod 19 to move back and forth, and the servo motor can be used to control the start and stop of the oil pump 8, so as to realize the precise control of the boost stage and the precise movement control of the working piston 2 and the working rod 19; during operation, after the motor 4 is started, it can control the working piston 2 and the working rod 19 to move downward separately through the first clutch 6, and reach the predetermined mold closing position for mold closing. After the mold closing is completed, the clutch active member 671 and the clutch driven member 672 of the first clutch 6 are separated, and the screw 14 stops rotating. In this process, the clutch active member and the clutch driven member of the second clutch 7 are separated; in the boost stage, the clutch active member 671 and the clutch driven member 672 of the second clutch 7 are combined, and the clutch driven member 672 rotates with the clutch active member 671, and the power input shaft 2 0 rotates accordingly, the oil pump 8 starts, and the hydraulic oil in the oil storage cylinder 3 is pumped into the working cylinder 1 to complete the pressurization process; in addition to the above-mentioned first clutch 6 and second clutch 7 respectively drive the screw rod 14 and the power input shaft 20 to work, the first clutch 6 and second clutch 7 can also drive the screw rod 14 and the power input shaft 20 to work at the same time, at this time, the clutch active parts 671 and clutch driven parts 672 of the two clutches are combined together; especially in the mold closing stage, the speed of the servo motor slows down, the clutch active parts 671 and clutch driven parts 672 of the second clutch 7 are combined, and the oil pump 8 is started. Once the mold closing is completed, the clutch active parts 671 and clutch driven parts 672 of the first clutch 6 are separated, and the speed of the servo motor is accelerated, which is conducive to shortening the switching time of the two clutches, thereby improving efficiency. Compared with existing similar products, the electric hydraulic cylinder of the present invention adopts a servo motor to realize the drive of the working piston 2 and the oil pump 8, while improving the processing accuracy, saving the material cost of the electric hydraulic cylinder, and reducing the volume of the electric hydraulic cylinder.

[0037] In the above description, it should be noted that the terms "installed", "connected", "connected" and other corresponding terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components; "provided in" should be understood as "installed in, set in", including fixed installation, movable installation and other installation methods.

[0038] Obviously, the embodiments described above are only some embodiments of the present invention, not all embodiments. The preferred embodiments of the present invention are given in the drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Any equivalent structure made by using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A new type of clutch servo electric hydraulic cylinder, comprising a working cylinder barrel (1) and a working piston (2) arranged therein, and an oil storage barrel (3) connected to the working cylinder barrel; characterized in that: It also includes a motor (4), a main transmission member (9) arranged at the output end of the motor, a driven member (5) connected to the main transmission member, a first clutch (6) and a second clutch (7) respectively arranged on both sides of the driven member and connected to and driven by the driven member; an oil pump (8) connected to the second clutch; the first clutch is connected to the working piston (2) and drives it to reciprocate in the working cylinder (1); the oil pump is used to pump hydraulic oil in the oil storage cylinder (3) into the working cylinder.

2. A new type of clutch servo hydraulic cylinder as claimed in claim 1, characterized in that: The motor (4) is a servo motor, and the main transmission member arranged at its output end is a driving synchronous wheel; the driven member (5) is a synchronous wheel; the driving synchronous wheel and the driven member are connected via a synchronous belt (10).

3. A new type of clutch servo hydraulic cylinder as claimed in claim 1, characterized in that: The upper end of the working cylinder (1) is provided with an upper end cover (11), and a bracket (12) for mounting an oil pump (8) is provided on the upper end cover; the first clutch (6), the driven member (5), and the second clutch (7) are stacked and mounted on the upper end cover, and the second clutch is located below the oil pump; the lower end of the oil storage cylinder (3) is provided with an oil lower cover (13) which is connected to the interior thereof.

4. A new type of clutch servo hydraulic cylinder as claimed in claim 3, characterized in that: The first clutch (6) and the second clutch (7) are electromagnetic clutches or pneumatic clutches, and both have the same structure, and both include a clutch driving member (671) fixedly connected to the driven member (5) and coaxially arranged, a clutch driven member (672), a clutch support member (673), and an adapter member (674) inserted into the axial hole of the clutch driven member and rotating synchronously therewith; the clutch driven member can move along the axial direction of the adapter member to achieve the combination and separation of the clutch driving member (671) and the clutch driven member.

5. A new type of clutch servo hydraulic cylinder as claimed in claim 4, characterized in that: The oil pump (8) is a gear pump, a plunger pump or a vane pump. The power input shaft (20) arranged at one end of the oil pump is inserted into the axial hole of the adapter (674) of the second clutch (7), and the power input shaft rotates synchronously with the adapter.

6. A new type of clutch servo hydraulic cylinder as claimed in claim 4, characterized in that: It also includes a screw rod (14), the upper end of which passes through the axial hole of the adapter (674) of the first clutch (6) and extends into the clutch active part (671) above the adapter; the screw rod rotates synchronously with the adapter; the working piston (2) is sleeved on the screw rod and moves axially along the working cylinder barrel (1) as the screw rod rotates.

7. A new clutch servo hydraulic cylinder according to any one of claims 4 to 6, characterized in that: Planar teeth (15) are provided on the surfaces of the clutch active member (671) and the clutch driven member (672) that are in contact with each other.

8. A new type of clutch servo hydraulic cylinder as claimed in claim 3, characterized in that: It also includes an oil inlet pipe (16), one end of which is connected to the interior of the oil lower cover (13) and the other end of which is connected to the oil pump (8); and an oil outlet pipe (17), one end of which is connected to the oil pump (8) and the other end of which is connected to the interior of the upper end cover (11), and the connection position between the oil outlet pipe and the working cylinder barrel is located above the working piston (2).

9. A new type of clutch servo hydraulic cylinder as claimed in claim 3, characterized in that: The lower oil cover (13) is provided with a longitudinal through hole communicating with the inside of the oil storage cylinder and a transverse oil hole (1301) communicating with the longitudinal through hole; the upper end cover (11) is provided with a transverse oil inlet hole (1101) whose two ends are respectively connected with the working cylinder barrel (1) and the transverse oil hole.

10. A new type of clutch servo hydraulic cylinder as claimed in claim 9, characterized in that: It further comprises a switch valve (18), which is fixedly mounted at the lower end of the oil lower cover (13) and whose valve stem (1801) is inserted into the longitudinal through hole when it extends upwards, and is used to close the passage for the hydraulic oil in the oil storage cylinder to enter the transverse oil hole (1301); when the valve stem is retracted, the passage is opened.

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