Servo motor direct-drive hydraulic cylinder with feedback function

Abstract

The utility model discloses a servo motor direct-drive hydraulic cylinder with a feedback function, and relates to the technical field of servo motor direct-drive hydraulic cylinders. One end of an inner cavity of the first hydraulic cylinder body is movably connected with a valve element, one end of the feedback nut is fixedly connected with a second lead screw, one end of the second lead screw is movably connected with a sliding piece, the second lead screw is sleeved with a cylinder barrel, and the valve element is driven to rotate through a servo motor. When the valve element rotates, the length of the first lead screw in the connecting cavity is changed, and through a first through groove formed in the first hydraulic cylinder body and closed-loop control over a first circulation opening, a second circulation opening, a third circulation opening and a fourth circulation opening, the pulse signals are directly set and output according to the displacement, speed and direction of the operation of the hydraulic cylinder, so that the pulse signals are more direct and simpler, and the defect that a sensor is easily interfered is avoided.

Description

Technical Field

[0001] This utility model relates to the field of servo motor direct-drive hydraulic cylinder technology, specifically a servo motor direct-drive hydraulic cylinder with feedback. Background Technology

[0002] A digital hydraulic cylinder is a high-tech hydraulic cylinder product that integrates a stepper or servo motor, a hydraulic spool valve, and a closed-loop position feedback design within the cylinder. When connected to a hydraulic oil source, all functions are directly controlled by digital pulse signals from a digital cylinder controller, computer, or programmable logic controller (PLC) to achieve length vector control. Also known as an electro-hydraulic stepper cylinder, electro-hydraulic pulse cylinder, or CNC pulse hydraulic cylinder, it uses digital technology to control the angular displacement of a stepper or servo motor, thereby controlling the opening and closing angle of the hydraulic spool valve and regulating the oil flow rate to achieve control over the cylinder's operating speed and displacement. Feedback mechanisms typically use sensors to collect displacement and speed information from the hydraulic cylinder and feed it back to the stepper or servo motor, adjusting the angular displacement for precise control. However, such feedback mechanisms are complex, have delayed control response, and poor anti-interference capabilities. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a servo motor direct-drive hydraulic cylinder with feedback. This solves the problem that most feedback mechanisms rely on sensors to collect displacement and speed information of the hydraulic cylinder and feed it back to a stepper motor or servo motor to adjust the angular displacement for precise control of the hydraulic cylinder. However, such feedback mechanisms are relatively complex, have delayed control response, and poor anti-interference capabilities.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a servo motor direct-drive hydraulic cylinder with feedback. It includes a first hydraulic cylinder body, with a second hydraulic cylinder body located at one end of the first hydraulic cylinder body. A first through groove is formed at the top of the inner cavity of the first hydraulic cylinder body. A valve core is movably connected to one end of the inner cavity of the first hydraulic cylinder body. A first lead screw is fixedly connected to one end of the valve core. A feedback nut is sleeved on the outside of the first lead screw. A second lead screw is fixedly connected to one end of the feedback nut. A sliding member is movably connected to one end of the second lead screw. A cylinder barrel is sleeved on the outside of the second lead screw.

[0005] Preferably, the bottom of the first hydraulic cylinder is fixedly connected to a first flow port, a second flow port, a third flow port, and a fourth flow port, and the tops of the first flow port, the second flow port, the third flow port, and the fourth flow port communicate with the inner cavity of the first hydraulic cylinder.

[0006] Preferably, the valve core has two protruding blocks on its surface, and the inner cavity of the first hydraulic cylinder has a second through groove protruding therein, with the surfaces of the two blocks fitting against the bottom of the second through groove.

[0007] Preferably, one end of the feedback nut has a connecting cavity, the inner wall of the connecting cavity has a threaded structure, the first lead screw and the connecting cavity are interlocked by the threaded structure, and the feedback nut is semi-cylindrical.

[0008] Preferably, a fixed groove is provided at one end of the cylinder, and a sliding groove is provided inside the cylinder. The sliding member is movably connected to one end of the cylinder through the fixed groove. The surface of the second lead screw is provided with a threaded structure, and the sliding member and the second lead screw are interlocked through the threaded structure.

[0009] Preferably, a seal is provided at one end of the second hydraulic cylinder, a first connecting plate protrudes from one end of the first hydraulic cylinder, and second connecting plates protrude from both ends of the second hydraulic cylinder. Fixing bolts are provided through the interior of the first connecting plate and the third flow port, and the second hydraulic cylinder and the seal are fixedly connected by fixing bolts.

[0010] Preferably, a servo motor is fixedly connected to one end of the first hydraulic cylinder, and the output end of the servo motor passes through the side of the first hydraulic cylinder and is fixedly connected to the valve core on the inner wall of the first hydraulic cylinder.

[0011] This invention provides a servo motor direct-drive hydraulic cylinder with feedback. Compared with the prior art, it has the following advantages:

[0012] 1. A servo motor-driven hydraulic cylinder with feedback drives the valve core to rotate. Since the first lead screw and the feedback nut are interlocked by threads, the length of the first lead screw inside the connecting cavity changes when the valve core rotates. Through the first through groove opened inside the first hydraulic cylinder body, and the closed-loop control between the first flow port, the second flow port, the third flow port and the fourth flow port fixedly connected at the bottom, the output pulse signal is set directly according to the displacement, speed and direction of the hydraulic cylinder. This is more direct and simple, and avoids the defect of the sensor being susceptible to interference.

[0013] 2. The servo motor with feedback directly drives the hydraulic cylinder. The protruding blocks on the surface of the valve core isolate the protruding parts in the inner cavity of the first hydraulic cylinder, connecting and closing different flow ports, changing the path of liquid flow, and guiding the liquid into different channels. The valve core can directly respond to the control signal of the servo motor. Since the sliding part is sleeved outside the second lead screw, it drives the cylinder sleeved outside the sliding part to move inside the second hydraulic cylinder, making the running speed and displacement more accurate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is an exploded view of the overall structure of this utility model;

[0016] Figure 3 This is a schematic cross-sectional view of the structure of this utility model;

[0017] Figure 4 This is a partial structural diagram of the present invention.

[0018] In the diagram: 1. First hydraulic cylinder body; 100. First flow port; 101. Second flow port; 102. Third flow port; 103. Fourth flow port; 104. First connecting plate; 105. First through groove; 106. Second through groove; 2. Second hydraulic cylinder body; 200. Second connecting plate; 3. Seal; 4. Fixing bolt; 5. Cylinder barrel; 500. Fixing groove; 501. Slide groove; 6. Valve core; 600. Stop block; 601. First lead screw; 7. Feedback nut; 700. Connecting cavity; 8. Sliding component; 9. Second lead screw; 10. Servo motor. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a servo motor direct-drive hydraulic cylinder with feedback. It includes a first hydraulic cylinder body 1, with a second hydraulic cylinder body 2 located at one end of the first hydraulic cylinder body 1. A first through groove 105 is formed at the top of the inner cavity of the first hydraulic cylinder body 1. A valve core 6 is movably connected to one end of the inner cavity of the first hydraulic cylinder body 1. A first lead screw 601 is fixedly connected to one end of the valve core 6. A feedback nut 7 is sleeved on the outside of the first lead screw 601. A second lead screw 9 is fixedly connected to one end of the feedback nut 7. A sliding member 8 is movably connected to one end of the second lead screw 9. A cylinder 5 is sleeved on the outside of the second lead screw 9. When the valve core 6 is in the neutral position, liquid cannot pass through the first hydraulic cylinder. Inside body 1, the oil circuit is cut off, and the liquid cannot reach the cylinder. When the stop 600 on the surface of valve core 6 is on the left or right, the oil circuit is connected. The connected oil circuit allows the liquid inside the second hydraulic cylinder 2 to reach the inner cavity of the first hydraulic cylinder 1. The liquid on the other side of the inner cavity of the first hydraulic cylinder 1 will return to the oil tank. The third flow port 102 is used to connect the pump, and the fourth flow port 103 is used to connect the oil tank. The first flow port 100 and the third flow port 102 are connected inside the second hydraulic cylinder 2. The valve core 6 can reach three positions: left, middle, and right.

[0021] Please see Figure 1-4 The bottom of the first hydraulic cylinder body 1 is fixedly connected to a first flow port 100, a second flow port 101, a third flow port 102, and a fourth flow port 103. The tops of the first flow port 100, the second flow port 101, the third flow port 102, and the fourth flow port 103 communicate with the inner cavity of the first hydraulic cylinder body 1. The surface of the valve core 6 has two protruding stops 600. The inner cavity of the first hydraulic cylinder body 1 has a protruding second through groove 106. The surfaces of the two stops 600 fit against the bottom of the second through groove 106. One end of the feedback nut 7 has a connecting cavity 700, and the inner wall of the connecting cavity 700 is provided with a threaded structure. The first lead screw 601 and the connecting cavity 700 are interlocked by a threaded structure. The feedback nut 7 is semi-cylindrical, which allows the inner cavities of the first hydraulic cylinder 1 and the second hydraulic cylinder 2 to communicate with each other. When the first lead screw 601 rotates inside the connecting cavity 700, it changes the position of the valve core 6 in the inner cavity of the first hydraulic cylinder 1, thereby changing the communication relationship between the first through groove 105 and the first flow port 100, the second flow port 101, the third flow port 102, and the fourth flow port 103. A fixing groove 500 is provided at one end of the cylinder barrel 5, and a sliding groove is provided inside the cylinder barrel 5. 501, the sliding member 8 is movably connected to one end of the cylinder 5 through the fixed groove 500. The surface of the second lead screw 9 is provided with a threaded structure. The sliding member 8 and the second lead screw 9 are interlocked through the threaded structure. When the second lead screw 9 is driven to rotate by the valve core 6, the sliding member 8 moves by fitting onto the surface of the second lead screw 9, causing the externally sleeved cylinder 5 to slide inside the second hydraulic cylinder body 2. When the servo motor 10 rotates in the forward direction, the second lead screw 9 causes the externally sleeved cylinder 5 to extend. When the cylinder 5 reaches the preset position, the feedback nut 7 sends a signal feedback to the servo motor 10, and the servo motor 10 rotates in the reverse direction, causing... The second lead screw 9 drives the externally sleeved cylinder 5 to retract. A seal 3 is provided at one end of the second hydraulic cylinder body 2. A first connecting plate 104 protrudes from one end of the first hydraulic cylinder body 1. A second connecting plate 200 protrudes from both ends of the second hydraulic cylinder body 2. A fixing bolt 4 is provided through the interior of the first connecting plate 104 and the third flow port 102. The second hydraulic cylinder body 2 and the seal 3 are fixedly connected by the fixing bolt 4. A servo motor 10 is fixedly connected to one end of the first hydraulic cylinder body 1. The output end of the servo motor 10 passes through the side of the first hydraulic cylinder body 1 and is fixedly connected to the valve core 6 on the inner wall of the first hydraulic cylinder body 1.

[0022] In use, the servo motor 10 drives the valve core 6 to rotate. Since the first lead screw 601 and the feedback nut 7 are interlocked by threads, the rotation of the valve core 6 changes the length of the first lead screw 601 inside the connecting cavity 700. Through the closed-loop control between the first through groove 105 inside the first hydraulic cylinder 1 and the first flow port 100, second flow port 101, third flow port 102, and fourth flow port 103 fixedly connected at the bottom, when the valve core 6 is in the neutral position, liquid cannot pass through the interior of the first hydraulic cylinder 1, and the oil circuit is cut off. When the liquid cannot reach the cylinder, the oil circuit will be connected when the stop 600 on the surface of the valve core 6 is on the left or right. The connected oil circuit allows the liquid inside the second hydraulic cylinder 2 to reach the inner cavity of the first hydraulic cylinder 1. The liquid on the other side of the inner cavity of the first hydraulic cylinder 1 will return to the oil tank. When the servo motor 10 rotates in the forward direction, the second lead screw 9 drives the externally sleeved cylinder 5 to extend. When the cylinder 5 reaches the preset position, the feedback nut 7 sends a signal feedback to the servo motor 10, and the servo motor 10 rotates in the reverse direction, causing the second lead screw 9 to drive the externally sleeved cylinder 5 to retract.

[0023] In this embodiment, the servo motor directly drives the hydraulic cylinder with feedback. The structural features and working principle of the above-mentioned components are based on existing technologies and will not be described in detail here.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A servo motor direct-drive hydraulic cylinder with feedback, comprising a first hydraulic cylinder body (1), characterized in that: A second hydraulic cylinder (2) is provided at one end of the first hydraulic cylinder (1). A first through groove (105) is opened at the top of the inner cavity of the first hydraulic cylinder (1). A valve core (6) is movably connected to one end of the inner cavity of the first hydraulic cylinder (1). A first lead screw (601) is fixedly connected to one end of the valve core (6). A feedback nut (7) is sleeved on the outside of the first lead screw (601). A second lead screw (9) is fixedly connected to one end of the feedback nut (7). A sliding member (8) is movably connected to one end of the second lead screw (9). A cylinder (5) is sleeved on the outside of the second lead screw (9).

2. The servo motor direct-drive hydraulic cylinder with feedback according to claim 1, characterized in that: The bottom of the first hydraulic cylinder body (1) is fixedly connected to a first flow port (100), a second flow port (101), a third flow port (102) and a fourth flow port (103), and the tops of the first flow port (100), the second flow port (101), the third flow port (102) and the fourth flow port (103) are connected to the inner cavity of the first hydraulic cylinder body (1).

3. The servo motor direct-drive hydraulic cylinder with feedback according to claim 1, characterized in that: The valve core (6) has two protruding blocks (600) on its surface, and the inner cavity of the first hydraulic cylinder (1) has a second through groove (106) protruding. The surfaces of the two blocks (600) are in contact with the bottom of the second through groove (106).

4. The servo motor direct-drive hydraulic cylinder with feedback according to claim 1, characterized in that: The feedback nut (7) has a connecting cavity (700) at one end, and the inner wall of the connecting cavity (700) is provided with a threaded structure. The first lead screw (601) and the connecting cavity (700) are interlocked by the threaded structure. The feedback nut (7) is semi-cylindrical.

5. The servo motor direct-drive hydraulic cylinder with feedback according to claim 1, characterized in that: A fixed groove (500) is provided at one end of the cylinder (5), and a sliding groove (501) is provided inside the cylinder (5). The sliding member (8) is movably connected to one end of the cylinder (5) through the fixed groove (500). The surface of the second lead screw (9) is provided with a threaded structure, and the sliding member (8) and the second lead screw (9) are interlocked with each other through the threaded structure.

6. The servo motor direct-drive hydraulic cylinder with feedback according to claim 1, characterized in that: The second hydraulic cylinder (2) is provided with a seal (3) at one end, the first hydraulic cylinder (1) is provided with a first connecting plate (104) at one end, the second hydraulic cylinder (2) is provided with a second connecting plate (200) at both ends, and a fixing bolt (4) is provided through the interior of the first connecting plate (104) and the third flow port (102). The second hydraulic cylinder (2) and the seal (3) are fixedly connected by the fixing bolt (4).

7. The servo motor direct-drive hydraulic cylinder with feedback according to claim 6, characterized in that: A servo motor (10) is fixedly connected to one end of the first hydraulic cylinder (1). The output end of the servo motor (10) passes through the side of the first hydraulic cylinder (1) and is fixedly connected to the valve core (6) on the inner wall of the first hydraulic cylinder (1).

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