Servo press externally connected with grating ruler
By using an external grating ruler and a buffer design, the problem of low displacement detection accuracy in traditional servo presses is solved, enabling high-precision displacement control and dynamic error compensation, thereby improving the processing stability and service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN GOHW TECH CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional servo presses have low displacement detection accuracy, cannot dynamically compensate for workpiece tolerances, and lack redundant protection mechanisms, resulting in low machining accuracy and easy equipment damage.
An external grating ruler is used to replace the traditional mechanical limit or encoder. Combined with a hydraulic damper and tension spring design, high-resolution displacement detection and closed-loop control are achieved. The grating ruler is integrated with an external computing system to dynamically compensate for mechanical wear and workpiece size deviations, thereby enhancing the equipment protection mechanism.
It improves displacement detection accuracy and processing consistency, reduces equipment vibration interference, extends equipment life, and is suitable for precision machining scenarios.
Smart Images
Figure CN224145446U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automation equipment technology, specifically a servo press with an external grating ruler. Background Technology
[0002] In the field of precision manufacturing, servo presses are core equipment for metal forming, riveting, and assembly processes, and their displacement control accuracy directly affects the consistency of product quality. Traditional servo presses generally employ the following technical solutions for position control:
[0003] Mechanical limit control indirectly obtains the slider position by setting mechanical stops or hydraulic buffers at both ends of the press slider stroke, in conjunction with an encoder to detect the motor rotation angle. This solution has the following drawbacks: the encoder detection accuracy is affected by factors such as transmission system backlash and lead screw pitch error, and the displacement resolution is usually at the 0.01mm level, which is difficult to meet the requirements of microelectronic packaging, precision stamping and other scenarios. The mechanical stops are prone to deformation under long-term impact, resulting in positioning reference drift.
[0004] Built-in displacement sensor solutions, such as integrating magnetostrictive displacement sensors or grating rulers into the press body in some high-end models, have structural limitations: the sensor is rigidly connected to the press body, and the vibration of the equipment is directly transmitted to the detection element, resulting in increased signal noise. The sensor range is forcibly matched with the maximum stroke of the press, making it impossible to optimize the detection range for specific working conditions. The press body needs to be disassembled for maintenance, and the calibration process is complicated. Utility Model Content
[0005] The purpose of this invention is to provide a servo press with an external grating ruler, which aims to solve the technical problems of low displacement detection accuracy, inability to dynamically compensate for workpiece tolerances, and lack of redundancy protection mechanism in traditional servo presses.
[0006] This utility model provides the following technical solution: a servo press with an external grating ruler, characterized in that: it includes a press body, a fixture base is provided on the press body, a positioning fixture is fixedly provided on the upper middle part of the fixture base, guide posts are symmetrically provided on the upper side of the fixture base and around the positioning fixture, a fixture upper plate is slidably provided on the guide posts and above the positioning fixture, a buffer spring is provided between the fixture upper plate and the fixture base and outside the guide posts, a connecting member is fixedly provided on one side of the fixture upper plate, a bracket is fixed on the press body and behind the fixture base, a linear guide rail is vertically fixed on the bracket, a slide is slidably provided on the linear guide rail, a grating ruler is provided on the slide, the connecting member is fixedly connected to the slide, and the press body includes a pressure head that moves up and down, the pressure head is located directly above the fixture upper plate.
[0007] In a preferred embodiment, the slide is fixedly connected to the slide head of the grating ruler, and the slide rail of the grating ruler is vertically fixed on the fixed bracket.
[0008] In a preferred embodiment, a tension spring is provided between the upper front part of the fixed bracket and the slide.
[0009] In a preferred embodiment, a hydraulic buffer is fixedly installed on the front side of the fixed bracket, and the lower end of the hydraulic buffer is engaged with the upper side of the slide.
[0010] In the preferred embodiment, the stroke of the grating ruler is 150mm.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0012] High-precision position detection and closed-loop control
[0013] By using an external optical grating ruler to replace the traditional mechanical limit or encoder, high-resolution real-time feedback of the position of moving parts is achieved, resulting in high displacement detection accuracy and significantly improving the position control accuracy of the pressing process.
[0014] By integrating the grating ruler with an external computing control system, the "automatic stop when position is reached" function is realized, avoiding overpressure or underpressure and ensuring consistent pressing depth. It is suitable for high-precision processing scenarios such as precision electronic components and automotive parts.
[0015] Dynamic error compensation and displacement closed-loop control
[0016] The automatic compensation calculation function simplifies the operation process, reduces manual debugging time, and improves equipment utilization. It achieves closed-loop displacement control, automatically correcting displacement errors caused by factors such as mechanical wear and workpiece dimensional deviations, ensuring long-term machining accuracy stability.
[0017] Multiple security protection mechanisms
[0018] The hydraulic damper design prevents the carriage from impacting the grating ruler's travel limit, thus avoiding equipment damage; the tension spring-assisted reset mechanism reduces mechanical impact and extends the equipment's service life.
[0019] Structural optimization and improved operational reliability
[0020] The linear guide rail and carriage are designed separately, making the grating ruler independent of the press body's motion mechanism, reducing vibration interference and improving the stability of the detection signal. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the compensation structure of this utility model;
[0023] In the diagram: 1. Press body; 2. Fixture base; 3. Positioning fixture; 4. Guide column; 5. Fixture upper plate; 6. Buffer spring; 7. Connector; 8. Fixed bracket; 9. Linear guide rail; 10. Slide carriage; 11. Grating ruler; 12. Pressure head; 13. Tension spring; 14. Hydraulic damper; 1101. Sliding head; 1102. Slide rail. Detailed Implementation
[0024] 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.
[0025] like Figure 1 and Figure 2 As shown
[0026] A servo press with an external grating ruler includes a press body 1, a fixture base 2 on the press body 1, a positioning fixture 3 fixedly mounted on the upper center of the fixture base 2, guide posts 4 symmetrically arranged on the upper side of the fixture base 2 and around the positioning fixture 3, a fixture upper plate 5 slidably mounted on the guide posts 4 and above the positioning fixture 3, a buffer spring 6 between the fixture upper plate 5 and the fixture base 2 and outside the guide posts 4, a connector 7 fixedly mounted on one side of the fixture upper plate 5, a fixed bracket 8 on the press body 1 and behind the fixture base 2, a linear guide rail 9 vertically fixedly mounted on the fixed bracket 8, a slide 10 slidably mounted on the linear guide rail 9, a grating ruler 11 mounted on the slide 10, and a connector 7 fixedly connected to the slide 10. The press body 1 includes a pressure head 12 that moves up and down, the pressure head 12 being located directly above the fixture upper plate 5.
[0027] The slide 10 is fixedly connected to the slide head 1101 of the grating ruler 11, and the slide rail 1102 of the grating ruler 11 is vertically fixed on the fixed bracket 8. The stroke of the grating ruler 11 is 150mm.
[0028] A tension spring 13 is provided between the upper front part of the fixed bracket 8 and the slide 10. When the pressure head 12 of the press is no longer pressing on the upper plate 5 of the fixture, the tension spring 13 helps the slide 10 and the components fixedly connected to it to reset.
[0029] A hydraulic buffer 14 is fixedly installed on the front side of the fixed bracket 8, and the lower end of the hydraulic buffer 14 cooperates with the upper side of the slide 10. The hydraulic buffer 14 plays a role in buffering and positioning. When the slide 10 moves upward, the slider 1101 of the grating ruler 11 also moves upward, preventing the grating ruler 11 from exceeding its stroke or being damaged by impact.
[0030] When the pressure head moves downward and presses the upper plate 5 of the fixture downward, the upper plate 5 of the fixture will drive the slider 1101 of the grating ruler 11 to move up and down through the connector 7 and the slide 10. The grating ruler 11 can record the position of each moving part. This invention mainly records the following positions through the grating ruler 11: the position of the lower surface of the upper plate 5 when it is not pressed and is in a free state, and the position of the lower surface of the upper plate 5 when it is in the final position during pressing.
[0031] This invention adds an external position stop function, and the external position is read into the external computing and control system through the grating ruler 11.
[0032] This utility model requires a zero point. First, the upper plate 5 of the fixture is manually pressed to move it above the positioning fixture 3, triggering the zero point button. The position of the lower surface of the upper plate 5 at this point is taken as the coordinate zero point. Then, the distance from the position of the lower surface of the upper plate 5 in the free state to the coordinate zero point is the initial position value, denoted as B. During actual pressing, the distance from the position of the lower surface of the upper plate 5 at the final position to the coordinate zero point is the actual position value, denoted as A.
[0033] Subsequently, a compensation amount is needed between the actual value and the initial position value. Therefore, B minus A is the compensation amount that needs to be superimposed when the press machine presses the upper plate 5 of the fixture. This will give the current expected displacement value. The user sets the tolerance of this displacement value. After the actual displacement value reaches the set range, the movement is considered to be in place.
[0034] In addition, the press reuses the original protection position, protection pressure, action protection time and other parameters to trigger an alarm in case of an accident.
[0035] After powering on, you need to manually perform an initial position value zeroing operation to obtain the initial position value after powering on.
[0036] 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 process, method, article, or apparatus.
[0037] 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. An externally grating-serviced press machine, characterized by: The press includes a press body (1), on which a fixture base (2) is provided. A positioning fixture (3) is fixedly provided on the upper center of the fixture base (2). Guide posts (4) are symmetrically provided on the upper side of the fixture base (2) and around the positioning fixture (3). A fixture upper plate (5) is slidably provided on the guide posts (4) and above the positioning fixture (3). A buffer spring (6) is provided between the fixture upper plate (5) and the fixture base (2) and outside the guide posts (4). One side of the fixture upper plate (5) is fixedly provided. A connector (7) is fixedly provided. A bracket (8) is fixed on the press body (1) and located on the rear side of the fixture base (2). A linear guide rail (9) is vertically fixed on the bracket (8). A slide (10) is slidably provided on the linear guide rail (9). A grating ruler (11) is provided on the slide (10). The connector (7) is fixedly connected to the slide (10). The press body (1) includes a pressure head (12) that moves up and down. The pressure head (12) is located directly above the fixture upper plate (5).
2. A servo press for an externally mounted grating ruler according to claim 1, characterized in that: The slide (10) is fixedly connected to the slide head (1101) of the grating ruler (11), and the slide rail (1102) of the grating ruler (11) is vertically fixed on the fixed bracket (8).
3. A servo press for an externally mounted grating ruler according to claim 1, characterized in that: A tension spring (13) is provided between the upper front part of the fixed bracket (8) and the slide (10).
4. A servo press for an externally mounted grating ruler according to claim 1, characterized in that: A hydraulic buffer (14) is fixedly installed on the front side of the fixed bracket (8), and the lower end of the hydraulic buffer (14) is engaged with the upper side of the slide (10).
5. A servo press for an externally mounted grating ruler according to claim 1, characterized in that: The stroke of the grating ruler (11) is 150 mm.