Electric adjusting device for buffer height of hydraulic machine

Abstract

The utility model discloses a hydraulic machine buffering height electric adjusting device which comprises a buffering support fixed on the side wall of a sliding block, the buffering support is of a box type structure, a straight shaft speed reducer is fixed on the top wall of the buffering support, a spline shaft is arranged on the lower portion of an output shaft of the straight shaft speed reducer, and the spline shaft penetrates through a spline sleeve to be inserted into a hollow cavity of a buffering screw. The spline housing is fixed to the upper end of the buffer screw, the lower end of the buffer screw is connected with the buffer nut through threads, the lower end of the buffer screw extends out of the buffer nut, and the buffer nut is fixed to the bottom wall of the buffer support. A bull gear is fixed at the upper part of an output shaft of the straight-shaft speed reducer; a rotary encoder is further installed on the top wall of the buffering support, an output shaft of the rotary encoder is connected with a signal shaft through a coupler, the lower end of the signal shaft is inserted into an inner cavity of the buffering support and provided with a small gear, and the small gear is meshed with the large gear. According to the device, the height of the buffer opening can be automatically and accurately adjusted, the labor intensity is reduced, manual adjustment errors are avoided, and the die changing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a hydraulic press, in particular to an electric adjusting device for the buffer height of a hydraulic press, belonging to the technical field of hydraulic machine tools. Background Art

[0002] When the hydraulic press is performing operations such as blanking, punching, and trimming, due to the sudden decrease in the deformation resistance caused by the fracture of the material, it often causes a relatively large impact vibration, and even damages the machine parts. During the trimming process, as the slider descends, the trimming punch begins to contact the workpiece. If the slider continues to descend, relative movement will occur between the workpiece and the burr, that is, shearing will be carried out until the material fractures. The trimming force rises sharply within a short working stroke. Approximately at the position where the stroke is equal to 2 / 3 of the burr thickness, the trimming force reaches the maximum value, and then drops sharply until it becomes zero.

[0003] From the typical deformation resistance curves of blanking and punching, it can be seen that as the working stroke increases, the shearing force increases sharply. When the working stroke is approximately equal to 2 / 3 of the material thickness, the shearing force reaches the maximum value. At this time, if the working stroke continues to increase, the shearing force will rapidly decrease. When the material fractures, the shearing force decreases to zero. In order to prevent the hydraulic press from suddenly losing load when the material fractures, a buffer device can be installed below the material or on both sides of the slider when the working stroke slightly exceeds 2 / 3 of the material thickness, so as to increase the resistance of the slider to descend, prevent the hydraulic press from suddenly losing load when the material fractures, and thus reduce the impact vibration.

[0004] Due to different user die structures or the need to install different dies on the same hydraulic press, the adjustable height of the buffer opening of the buffer device needs to be readjusted. The adjustable height of the buffer opening of the conventional buffer device is achieved by rotating the screw. The disadvantages of this device are: manual operation is required, and the slider needs to be lowered during adjustment. When the hydraulic press is relatively high, it is inconvenient for manual operation, and it is difficult to keep the adjustment heights of the buffer devices on both sides of the slider consistent.

[0005] In addition, the traditional buffer electric adjustment mechanism is designed by deforming and referring to the principle of the stroke adjustment mechanism of a bending machine. The structure is relatively complex, a self-made worm and worm gear reduction mechanism is required, the accuracy is relatively low, and the running friction force is uneven. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the problems existing in the prior art and provide an electric adjusting device for the buffer height of a hydraulic press, which can accurately adjust the opening height between the lower end of the buffer screw and the lower buffer cylinder through a motor, reduce the labor intensity of the operator, avoid the error of manual adjustment, and improve the die change efficiency.

[0007] To solve the above technical problems, a hydraulic press buffer height electric adjustment device of the present utility model includes a buffer bracket fixed to the side wall of the slider. The buffer bracket is of a box-shaped structure. A straight shaft reducer is fixed on the top wall of the buffer bracket. The lower part of the output shaft of the straight shaft reducer is a spline shaft extending downward. The spline shaft passes through a spline sleeve and inserts into the hollow cavity of a buffer screw. The spline sleeve is fixed to the upper end of the buffer screw by screws. The lower end of the buffer screw is connected to a buffer nut by a thread and the lower end head of the buffer screw extends out of the buffer nut. The buffer nut is fixed to the bottom wall of the buffer bracket by screws; a large gear is fixed to the upper part of the output shaft of the straight shaft reducer; a rotary encoder is also installed on the top wall of the buffer bracket. The signal shaft of the rotary encoder inserts into the inner cavity of the buffer bracket and is equipped with a small gear. The small gear meshes with the large gear.

[0008] As an improvement of the present utility model, a hollow observation window is provided on the upper side wall of the buffer bracket. The large gear and the small gear are both located in the observation window.

[0009] As a further improvement of the present utility model, an induction disc is fixed to the top of the buffer screw by screws. A proximity switch installation window extending axially is provided on one side wall of the buffer bracket. A proximity switch installation bracket is installed in the proximity switch installation window. An upper proximity switch and a lower proximity switch for detecting the position of the induction disc are installed on the proximity switch installation bracket.

[0010] As a further improvement of the present utility model, a long groove is provided on the proximity switch installation bracket along the axis. The external thread sections of the upper proximity switch and the lower proximity switch respectively pass through the long groove and are fixed by lock nuts.

[0011] Compared with the prior art, the present utility model has achieved the following beneficial effects: 1. Replace the self-made worm and worm gear reduction mechanism with a standard gear reducer drive, which is convenient for procurement, reduces procurement costs, and simplifies the production process;

[0012] 2. After being installed in pairs on both sides of the slider, the rotation number signal of the buffer screw is obtained through the gear and the rotary encoder, so as to accurately calculate and adjust the lifting stroke of the buffer screw. When replacing the mold, the user can input the height value that the buffer opening needs to be adjusted to through an input display device such as a touch screen, and the control system automatically controls the motor to complete it, which has better adaptability to different mold structures and avoids the workload of manual adjustment and unnecessary errors on both sides;

[0013] 3. Field tests prove that this buffer height electric adjustment device meets the user's expectations, is safe and reliable, is convenient for installation, debugging and maintenance, has fast adjustment, and is more in line with the needs of humanization, bringing more economic benefits to the enterprise. Description of the Drawings

[0014] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings are only provided for reference and illustration purposes and are not intended to limit the present utility model.

[0015] Figure 1 It is the front view of the electric adjustment device for the buffer height of the hydraulic press of the present utility model;

[0016] Figure 2 is Figure 1 the top view of;

[0017] Figure 3 is Figure 1 the left view of;

[0018] Figure 4 It is the sectional view of the electric adjustment device for the buffer height of the hydraulic press of the present utility model;

[0019] Figure 5 It is the connection schematic diagram of the rotary encoder and the pinion in the present utility model;

[0020] In the figure: 1. Buffer bracket; 1a. Observation window; 1b. Proximity switch installation window; 2. Motor; 3. Straight shaft reducer; 4. Spline shaft; 5. Spline sleeve; 6. Buffer screw; 6a. Induction disc; 7. Buffer nut; 8. Large gear; 9. Rotary encoder; 10. Signal seat; 11. Coupling; 12. Signal shaft; 13. Pinion; 14. Proximity switch installation bracket; 15. Upper proximity switch; 16. Lower proximity switch. Specific embodiments

[0021] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.

[0022] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific illustrations.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0024] Such as Figures 1 to 5As shown in the figure, the electric height adjustment device for the hydraulic press buffer of the present utility model includes a buffer bracket 1, a straight shaft reducer 3, a spline shaft 4, a spline sleeve 5, a buffer screw 6 and a buffer nut 7, which are used in pairs and installed on both sides of the slider. The buffer bracket 1 is an independent component welded by steel plates into a box-shaped structure. On one side facing the slider, there is a buffer bracket flange, and the buffer bracket flange is fixedly connected to the side of the slider by screws, or can be directly welded to both sides of the slider as a whole.

[0025] A straight shaft reducer 3 is fixed on the top wall of the buffer bracket 1. The lower part of the output shaft of the straight shaft reducer 3 is a spline shaft 4 extending downward. The spline shaft 4 passes through the spline sleeve 5 and is inserted into the hollow cavity of the buffer screw 6. The spline sleeve 5 is fixed to the upper end of the buffer screw 6 by screws. The lower end of the buffer screw 6 is connected to the buffer nut 7 by threads and the lower end of the buffer screw 6 extends out of the buffer nut 7. The buffer nut 7 is fixed to the bottom wall of the buffer bracket 1 by screws; when the hydraulic press buffers, the lower end of the buffer screw 6 contacts the buffer cylinder installed on the workbench to generate a buffer force.

[0026] The motor 2 drives the straight shaft reducer 3 to operate to rotate the spline shaft 4. The spline shaft 4 passes through the spline sleeve 5. The spline sleeve 5 is fixed to the end of the buffer screw 6 by screws. The buffer screw 6 is hollow and the spline shaft 4 penetrates into it. The rotation of the spline shaft 4 drives the spline sleeve 5 and the buffer screw 6 to rotate. Relative rotation occurs between the buffer screw 6 and the buffer nut 7. The buffer nut 7 is reversely fixed to the lower end face of the buffer bracket by screws. The rotation of the buffer screw 6 will generate a relative movement of extension or retraction relative to the buffer nut 7, thus playing a role in adjusting the buffer position.

[0027] To detect the position of the buffer screw 6, a large gear 8 is installed on the upper smooth shaft section of the spline shaft 4. The large gear 8 is located in the observation window 1a on the upper part of the buffer bracket 1 and rotates synchronously with the spline shaft 4. A signal seat 10 is also fixed on the top wall of the buffer bracket 1. Above the signal seat 10, a rotary encoder 9 is installed through a bracket. The lower end of the output shaft of the rotary encoder 9 is connected to the upper end of the signal shaft 12 through a coupling 11. The middle section of the signal shaft 12 is supported in the signal seat 10 by bearings. The lower end of the signal shaft 12 is inserted into the inner cavity of the buffer bracket 1 and a small gear 13 is installed, and the small gear 13 meshes with the large gear 8.

[0028] The large gear 8 drives the small gear 13 on the signal shaft 12 connected to the rotary encoder 9 to rotate. The rotary encoder can detect the number of rotations of the small gear 13. According to the transmission ratio of the large and small meshing gears, the number of rotations of the buffer screw 6 can be calculated. According to the thread lead and the number of rotations of the buffer screw 6, the electric adjustment stroke of the buffer screw 6 can be calculated.

[0029] An approach switch installation window 1b is provided axially along the buffer bracket 1. An approach switch installation bracket 14 is installed in the approach switch installation window 1b. The upper and lower ends of the approach switch installation bracket 14 are respectively fixed to the buffer bracket 1 by screws. The middle section of the approach switch installation bracket 14 is recessed inward and embedded in the approach switch installation window 1b. A long slot is provided along the axis of the switch installation bracket for installing the upper approach switch 15 and the lower approach switch 16, and their positions can be adjusted. The upper approach switch 15 and the lower approach switch 16 detect the position of the induction disc 6a to protect against overtravel at the upper and lower limit positions and control the motor 2 of the direct-axis speed reducer 3 to stop.

[0030] The above are only the preferred and feasible embodiments of the present utility model, which show and describe the basic principles, main features and advantages of the present utility model. The patent protection scope of the present utility model is not limited thereby. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present utility model, the present utility model may have other implementation manners. The present utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model. The protection scope required by the present utility model is defined by the appended claims and their equivalents. The technical features not described in the present utility model can be realized by or adopted the existing technologies, and will not be elaborated herein.

Claims

1. A hydraulic press buffer height electric adjustment device, comprising a buffer bracket fixed to the side wall of a slide block, characterized in that: The buffer bracket is a box-type structure, and a straight-axis reducer is fixed on the top wall of the buffer bracket. The lower part of the output shaft of the straight-axis reducer is a spline shaft extending downward, and the spline shaft passes through the spline sleeve and is inserted into the hollow cavity of the buffer screw. The spline sleeve is fixed to the upper end of the buffer screw by a screw, and the lower end of the buffer screw is connected to the buffer nut by a thread and the lower end of the buffer screw extends out of the buffer nut, and the buffer nut is fixed to the bottom wall of the buffer bracket by a screw; a large gear is fixed to the upper part of the output shaft of the straight-axis reducer; a rotary encoder is also installed on the top wall of the buffer bracket, and the output shaft of the rotary encoder is connected to the signal shaft through a coupling, and the lower end of the signal shaft is inserted into the inner cavity of the buffer bracket and is installed with a small gear, and the small gear meshes with the large gear.

2. The electric adjustment device for hydraulic press buffer height according to claim 1 is characterized in that: The upper side wall of the buffer bracket is provided with a hollow observation window, and the large gear and the small gear are both located in the observation window.

3. The electric adjustment device for hydraulic press buffer height according to claim 1 is characterized in that: An induction disk is fixed to the top of the buffer screw by a screw, and a side wall of the buffer bracket is provided with an axially extending proximity switch installation window, a proximity switch installation bracket is installed in the proximity switch installation window, and an upper proximity switch and a lower proximity switch for detecting the position of the induction disk are installed on the proximity switch installation bracket.

4. The electric adjustment device for hydraulic press buffer height according to claim 3 is characterized in that: The proximity switch mounting bracket is provided with a long slot along the axis, and the external thread sections of the upper proximity switch and the lower proximity switch respectively pass through the long slot and are fixed by locking nuts.

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