Hydraulic lead screw composite mechanism

Abstract

The invention discloses a hydraulic lead screw composite mechanism which comprises hydraulic mechanisms, a lead screw and a mounting seat, the hydraulic mechanisms are fixedly connected to the two ends of the mounting seat, and the lead screw is connected with a lead screw nut and arranged in the middle of the mounting seat through the lead screw nut. The top end of the lead screw is provided with a synchronous movement block, two ends of which are connected with hydraulic mechanisms. The synchronous motion block is provided with a load connecting piece for connecting the clamp. According to the hydraulic lead screw composite mechanism, hydraulic pressure and the lead screw are combined, and the multi-stage speed reducer is used in a matched mode, so that the positioning resolution ratio is improved, and high-precision displacement control is achieved. The hydraulic cylinder provides driving force, the reverse pre-tightening function is applied in advance, and transmission errors caused by the fit clearance of the transmission lead screw are completely eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a hydraulic lead screw composite mechanism. Background Art

[0002] In the field of mechanical transmission technology, traditional push-pull mechanisms often use a screw or hydraulic drive alone. However, with the continuous development of industrial technology, the performance requirements for push-pull mechanisms are also increasing. Although the screw drive has high positioning accuracy, its bearing capacity is limited and cannot meet the needs of large loads; while the hydraulic drive can provide a strong driving force, it is not precise enough in displacement control.

[0003] In order to solve this problem, some people have tried to install a ball screw inside the hydraulic cylinder, which can meet the precise positioning of telescopic movement. However, the reducer and motor are installed at the tail of the hydraulic cylinder, which makes the size too long and requires a larger installation space. At the same time, it is inconvenient to inspect and maintain the screw inside the hydraulic cylinder. Under the existing technology, the matching clearance of the screw will also cause transmission error, resulting in inaccurate displacement control and severe wear of the screw. Summary of the invention

[0004] In view of the shortcomings of the current hydraulic screw composite mechanism that it cannot provide large driving force and achieve high-precision displacement control at the same time, the present invention provides a hydraulic screw composite mechanism, which combines the advantages of both the screw and the hydraulic pressure to achieve a double improvement in the driving force and positioning accuracy of the push-pull mechanism.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions: A hydraulic screw composite mechanism comprises a hydraulic mechanism, a screw and a mounting seat, wherein the hydraulic mechanism is fixedly connected to both ends of the mounting seat; the screw is connected to a screw nut and is arranged in the middle of the mounting seat through the screw nut, and a synchronous motion block is arranged at the top of the screw; both ends of the synchronous motion block are connected to the hydraulic mechanism, and the synchronous motion block is provided with a load connector to connect a clamp.

[0006] Preferably, the screw nut is connected to a servo motor to provide power for the rotation of the screw.

[0007] Preferably, a first reducer is installed between the lead screw nut and the servo motor to reduce the movement speed of the lead screw.

[0008] Preferably, a second reducer is installed between the first reducer and the servo motor to reduce the movement speed of the lead screw.

[0009] Preferably, the hydraulic mechanism comprises a hydraulic cylinder, which is mounted on a mounting seat and connected to a hydraulic piston rod, and the hydraulic piston rod is connected to the synchronous motion block.

[0010] Preferably, the synchronous motion block is fixed to the hydraulic piston rod by bolt connection.

[0011] Preferably, mounting holes are symmetrically provided at both ends of the mounting seat, and the two groups of hydraulic cylinders are respectively connected to the mounting holes.

[0012] Preferably, the load connecting member comprises a transition flange and a connecting flange, the transition flange connects the fixture and the connecting flange, and the connecting flange connects the transition flange and the lead screw, thereby achieving a fixed connection between the lead screw and the fixture.

[0013] Preferably, there are two groups of hydraulic mechanisms, which are arranged in parallel on the mounting seat.

[0014] Preferably, a sensor is provided at the connection between the synchronous motion block and the load connecting member, the sensor sends an electrical signal to the controller to feedback the load force, and the controller sends an electrical signal to the hydraulic mechanism to adjust the output of the hydraulic mechanism.

[0015] Advantages of the present invention: By combining hydraulic pressure with the lead screw 2, high-precision displacement control is achieved. The lead screw 2 is responsible for precise positioning, and when used in conjunction with a multi-stage reducer, the positioning resolution can be improved to ensure the accuracy of the displacement. The hydraulic cylinder 11 provides driving force and can apply a reverse preload function in advance, completely eliminating the transmission error caused by the matching clearance of the transmission lead screw 2. In addition, the mechanism has a compact structure, reduces the need for installation space, is easy to maintain, and improves the life and reliability of the mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a hydraulic screw composite mechanism described in the present invention.

[0018] Figure numerals: 1. Hydraulic mechanism; 11. Hydraulic cylinder; 12. Hydraulic piston rod; 2. Screw; 21. Screw nut; 3. Mounting seat; 4. Synchronous motion block; 5. Load connecting piece; 6. Clamp; 7. Servo motor; 81. First reducer; 82. Second reducer; 9. Sensor. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1

[0021] like Figure 1 As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2. At the same time, the hydraulic mechanism 1 can be used to apply the reverse preload function in advance, thereby completely eliminating the transmission error caused by the matching clearance of the transmission screw 2.

[0022] Example 2

[0023] like Figure 1 As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2.

[0024] There are two groups of hydraulic mechanisms 1, which are arranged in parallel on the mounting seat 3. The hydraulic mechanism 1 includes a hydraulic cylinder 11, which is mounted on the mounting seat 3 and connected to a hydraulic piston rod 12. The mounting seats 3 are symmetrically provided with mounting holes at both ends, and the two groups of hydraulic cylinders 11 are respectively connected with the mounting holes. The precise position and size design of the mounting holes further improve the installation accuracy and reliability of the mechanism.

[0025] The hydraulic piston rod 12 is connected to the synchronous motion block 4. The synchronous motion block 4 is fixed to the hydraulic piston rod 12 by bolt connection. The driving force provided by the hydraulic mechanism 1 is combined with the precise positioning of the lead screw 2 to achieve precise control of the displacement. By adjusting the pressure and flow of the hydraulic system, the moving speed and position of the synchronous motion block 4 can be precisely controlled.

[0026] Example 3

[0027] like Figure 1 As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2.

[0028] The load connector 5 includes a transition flange and a connecting flange, wherein the transition flange connects the fixture 6 and the connecting flange, and the connecting flange connects the transition flange and the lead screw 2, thereby realizing a fixed connection between the lead screw 2 and the fixture 6. The synergistic effect of the transition flange and the connecting flange enables the load connector 5 to effectively connect the fixture 6 and the lead screw 2. The design of the transition flange enables the connection of the fixture 6 to have a certain degree of flexibility, which can adapt to the needs of different fixtures 6, improves the versatility and applicability of the mechanism, and the connecting flange ensures the precise transmission of the load and the stability of the movement.

[0029] Example 4

[0030] like Figure 1As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2.

[0031] The lead screw nut 21 is connected to a servo motor 7 to provide power for the rotation of the lead screw 2. The servo motor 7 serves as a driving source to provide precise rotational motion. By controlling the rotation angle and speed of the servo motor 7, precise control of the motion of the lead screw 2 can be achieved.

[0032] Example 5

[0033] like Figure 1 As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2.

[0034] The lead screw nut 21 is connected to a servo motor 7 to provide power for the rotation of the lead screw 2. The servo motor 7 serves as a driving source to provide precise rotational motion. By controlling the rotation angle and speed of the servo motor 7, precise control of the motion of the lead screw 2 can be achieved.

[0035] Among them, a first reducer 81 is installed between the lead screw nut 21 and the servo motor 7 to reduce the movement speed of the lead screw 2. The first reducer 81 is installed on the mounting seat 3 and connected to the lead screw nut 21, and its rotation can drive the lead screw nut 21 to rotate synchronously. The main function of the first reducer 81 is to improve the transmission accuracy. Through the precise reduction ratio, the rotational motion of the servo motor 7 is converted into a small linear displacement of the lead screw 2, thereby realizing high-precision displacement control.

[0036] Among them, a second reducer 82 is installed between the first reducer 81 and the servo motor 7 to reduce the movement speed of the lead screw 2. Through multi-stage reduction, a greater torque output can be provided, and tiny pulse displacement control can be achieved, thereby ensuring high-precision operation of the entire mechanism. In specific implementation, the first reducer usually uses a hollow reducer to facilitate the installation of the second reducer; the second reducer usually uses a two-stage planetary reducer.

[0037] The positioning accuracy is calculated as follows: The lead screw has a pitch of 5mm, and the feed amount for one rotation is 5mm; the reduction ratio of the first reducer is 10:1; the reduction ratio of the second reducer is 10:1; one rotation of the servo motor can be subdivided into 10,000 pulses. Then the feed amount before and after one pulse after conversion is: 5mm feed amount ÷ 10,000 subdivisions ÷ 10 first-stage reduction ÷ 10 second-stage reduction × 1 pulse = 0.000005mm = 0.05um.

[0038] Therefore, one pulse of the servo motor 7 can precisely position the displacement at -0.05um.

[0039] Example 6

[0040] like Figure 1 As shown, a hydraulic screw composite mechanism includes a hydraulic mechanism 1, a screw 2 and a mounting seat 3, wherein the hydraulic mechanism 1 is fixedly connected to both ends of the mounting seat 3; the screw 2 is connected to a screw nut 21 and is arranged in the middle of the mounting seat 3 through the screw nut 21, and a synchronous motion block 4 is arranged at the top of the screw 2; both ends of the synchronous motion block 4 are connected to the hydraulic mechanism 1, and the synchronous motion block 4 is provided with a load connector 5 to connect the clamp 6. The screw nut 21, as a transmission component, cooperates with the screw 2 through its precise thread structure to convert the rotational motion into the linear motion of the screw 2, thereby realizing high-precision displacement control. The screw 2 moving forward and backward drives the synchronous motion block 4 to move forward and backward, thereby realizing precise push-pull operation of the load. The hydraulic cylinder 11 provides additional driving force to balance the output of the hydraulic cylinder 11 with the actual pulling pressure, thereby reducing the load and wear of the screw 2.

[0041] Among them, a sensor 9 is provided at the connection between the synchronous motion block 4 and the load connector 5, and the sensor 9 sends an electrical signal to the controller to feedback the load force, and the controller sends an electrical signal to the hydraulic mechanism 1 to adjust the output of the hydraulic mechanism 1. When the load increases slightly, the sensor 9 will feedback the electrical signal to the controller so as to adjust the output of the hydraulic cylinder 11 in time. This design enables the mechanism to maintain stable push-pull force and high-precision displacement control in practical applications. The controller adjusts the output of the hydraulic cylinder 11 according to the feedback signal of the sensor 9. The hydraulic cylinder 11 provides or reduces the driving force to balance the load and reduce the load and wear of the screw 2. Through precise program settings and intelligent adjustment of the controller, precise control and optimization of the mechanism movement can be achieved.

[0042] Advantages of the present invention: By combining hydraulic pressure with the lead screw 2, high-precision displacement control is achieved. The lead screw 2 is responsible for precise positioning, and when used in conjunction with a multi-stage reducer, the positioning resolution can be improved to ensure the accuracy of the displacement. The hydraulic cylinder 11 provides driving force and can apply a reverse preload function in advance, completely eliminating the transmission error caused by the matching clearance of the transmission lead screw 2. In addition, the mechanism has a compact structure, reduces the need for installation space, is easy to maintain, and improves the life and reliability of the mechanism.

[0043] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A hydraulic screw composite mechanism, comprising a hydraulic mechanism (1), a screw (2) and a mounting seat (3), characterized in that: The hydraulic mechanism (1) is fixedly connected to both ends of the mounting seat (3); the lead screw (2) is connected to a lead screw nut (21) and is arranged in the middle of the mounting seat (3) through the lead screw nut (21); a synchronous motion block (4) is arranged at the top of the lead screw (2); both ends of the synchronous motion block (4) are connected to the hydraulic mechanism (1), and the synchronous motion block (4) is provided with a load connecting piece (5) for connecting to a clamp (6).

2. The hydraulic screw composite mechanism according to claim 1, characterized in that: The lead screw nut (21) is connected to a servo motor (7) to provide power for the rotation of the lead screw (2).

3. The hydraulic screw composite mechanism according to claim 2, characterized in that: A first speed reducer (81) is installed between the lead screw nut (21) and the servo motor (7) to reduce the movement speed of the lead screw (2).

4. The hydraulic screw composite mechanism according to claim 3, characterized in that: A second reducer (82) is installed between the first reducer (81) and the servo motor (7) to reduce the movement speed of the lead screw (2).

5. The hydraulic screw composite mechanism according to claim 1, characterized in that: The hydraulic mechanism (1) comprises a hydraulic cylinder (11), wherein the hydraulic cylinder (11) is mounted on a mounting seat (3) and is connected to a hydraulic piston rod (12), and the hydraulic piston rod (12) is connected to a synchronous motion block (4).

6. The hydraulic screw composite mechanism according to claim 5, characterized in that: The synchronous motion block (4) is fixed to the hydraulic piston rod (12) by means of bolt connection.

7. The hydraulic screw composite mechanism according to claim 5, characterized in that: The mounting seat (3) has mounting holes symmetrically arranged at both ends, and the two groups of hydraulic cylinders (11) are respectively connected to the mounting holes.

8. The hydraulic screw composite mechanism according to claim 1, characterized in that: The load connecting member (5) comprises a transition flange and a connecting flange, the transition flange connects the fixture (6) and the connecting flange, and the connecting flange connects the transition flange and the lead screw (2), thereby achieving a fixed connection between the lead screw (2) and the fixture (6).

9. The hydraulic screw composite mechanism according to claim 1, characterized in that: The hydraulic mechanism (1) has two groups, and is arranged in parallel on the mounting seat (3).

10. The hydraulic screw composite mechanism according to any one of claims 1 to 9, characterized in that: A sensor (9) is provided at the connection between the synchronous motion block (4) and the load connecting member (5); the sensor (9) sends an electrical signal to a controller to feedback the load force; and the controller sends an electrical signal to the hydraulic mechanism (1) to adjust the output of the hydraulic mechanism (1).

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