Floating hydraulic locking device for static pressure workbench

Abstract

The invention relates to the field of machine tools, in particular to a floating hydraulic locking device for a static pressure workbench. The static pressure workbench mainly solves the problem that when an existing static pressure workbench is positioned, workbench motor loss is serious, and the stability of the workbench is affected. The floating hydraulic locking device for the static pressure working table comprises a base (1) which is fixed on the static pressure working table, and is characterized in that a boss is arranged outside the base (1), a groove (12) is formed in the boss, and a spring (2) is arranged in the groove (12); a floating device is arranged on the upper portion of the boss of the base (1) and movably connected to the base (1) through a guide threaded pin (6). According to the floating hydraulic locking device for the static pressure workbench, the precision of the position of the rotary table after the workbench rotates to a specified angle can be guaranteed, locking force cannot be transmitted to other structures of the static pressure workbench, and other parts of the workbench cannot be damaged.

Description

Technical Field

[0001] The invention relates to the field of machine tools, in particular to a floating hydraulic locking device for a static pressure workbench. Background Art

[0002] With the improvement of market requirements, the demand for processing equipment for ring parts is increasing in the market. More and more customers are gradually raising the precision requirements for the processing of such parts. In response to the change in the processing technology of this type of parts, more and more users are proposing composite processing functions in order to improve production efficiency and improve the precision of parts. The current hydrostatic workbench usually adds a high positioning function on the basis of meeting high-precision rotation and high load-bearing capacity. In order to achieve this high positioning function and meet the requirements of positioning accuracy of 4 arc seconds and repeated positioning accuracy of 2 arc seconds, a high-precision rotary encoder is usually installed on the hydrostatic workbench, and the workbench motor is used to achieve closed-loop control. After the hydrostatic workbench achieves angle positioning, the cutting force in the part processing process is overcome by controlling the vector energy of the workbench motor. However, this control method will increase the loss of the workbench motor, thereby affecting the stability and reliability of the workbench. Summary of the invention

[0003] In order to overcome the shortcomings of the existing hydrostatic workbench that the workbench motor suffers serious loss during positioning, thus affecting the stability of the workbench, the present invention provides a floating hydraulic locking device for the hydrostatic workbench. The floating hydraulic locking device for the hydrostatic workbench can ensure the accuracy of the turntable position after the workbench is rotated to a specified angle, and the locking force will not be transmitted to the remaining structures of the hydrostatic workbench, and will not cause damage to other components of the workbench.

[0004] The technical solution of the present invention is: a floating hydraulic locking device for a static pressure workbench, comprising a base, the base is fixed on the static pressure workbench, a boss is arranged on the outside of the base, a groove is arranged on the boss, and a spring is arranged in the groove; a floating device is arranged on the upper part of the boss of the base, and the floating device is movably connected to the base through a guide threaded pin; The floating device includes a clamping upper plate and a clamping lower plate, and the clamping upper plate and the clamping lower plate are fixed by bolts; a guide groove is opened on the upper part of the clamping lower plate, and a vertical locking ring is arranged in the guide groove, and the bottom of the guide groove is connected to the hydraulic unit through a hydraulic oil channel; a locking plate is arranged between the locking ring and the clamping upper plate.

[0005] Furthermore, an annular step is formed on the contact surfaces of the clamping lower plate and the clamping upper plate, the locking plate is located on the upper part of the annular step, and the thickness of the locking plate is smaller than the height of the annular step.

[0006] Furthermore, the locking disk is connected to the rotating part of the static pressure workbench.

[0007] Furthermore, a wear-resistant guide sleeve is fixed to the outside of the base, and the floating device is sleeved on the outside of the wear-resistant guide sleeve.

[0008] Furthermore, two guide rings are provided between the outer wall of the locking ring and the inner wall of the guide groove, and a sealing ring is provided between the two guide rings.

[0009] Furthermore, after the guide thread pin passes through the floating device, the lower end is connected to the base through a thread, and there is a gap between the upper surface of the floating device and the locking surface of the upper end of the guide thread pin.

[0010] Furthermore, position sensors are fixed on the clamping upper plate and the locking ring to detect position information of the locking plate.

[0011] Furthermore, an annular groove is formed on the bottom surface of the guide groove, the width of the annular groove is smaller than the width of the guide groove, and the bottom of the annular groove is communicated with the hydraulic oil channel.

[0012] Furthermore, the hydraulic unit is provided with a pressure sensor and a flow sensor.

[0013] The present invention has the following beneficial effects: (1) The clamping upper plate, locking ring and locking plate together form a floating device. When the hydraulic unit supplies oil, the locking ring and the clamping upper plate clamp the locking plate together. At the same time, the floating device drives the rotating parts of the hydrostatic workbench to float and perform indexing and other actions. During this process, the floating device can self-adjust the force center so that the locking plate can always be in the center position of the clamping upper plate and the clamping lower plate, avoiding the hydraulic locking force on the locking plate and causing deformation of the locking plate, and the locking force will not be transmitted to the rest of the structure of the hydrostatic workbench, and will not cause damage to other parts of the workbench.

[0014] (2) A spring is provided under the floating device. When the hydraulic unit leaks oil, the spring can prevent the lower surface of the clamping upper plate from contacting the upper surface of the locking plate due to the weight of the parts, thereby preventing abnormal movement of the hydrostatic worktable caused by friction between the two surfaces when the hydrostatic worktable rotates.

[0015] (3) The present invention installs high-precision position sensors on the clamping upper plate and the locking ring respectively, which can be used to detect the position information of the locking plate. During the locking process, a closed-loop control function is formed through signal feedback. In addition, during the process of loosening the locking plate, the position information of the locking plate is also monitored in real time.

[0016] (4) The hydraulic unit realizes the automation and quantification of the locking force when the hydraulic locking device executes the action by controlling the hydraulic oil, which is convenient for operation. In addition, the hydraulic unit is equipped with a pressure monitoring sensor and a flow sensor, which can effectively monitor the stability of the oil pressure and the flow. Combined with the servo oil pump, the hydraulic system forms a closed-loop control, ensuring the stability and reliability of the hydraulic oil, avoiding the pressure change of the hydraulic oil affecting the locking effect of the static pressure workbench, thereby ensuring the processing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0018] In the figure, 1-base, 2-spring, 3-clamping lower plate, 4-locking plate, 5-clamping upper plate, 6-guide thread pin, 7-wear-resistant guide sleeve, 8-oil inlet joint, 9-sealing ring, 10-guide ring, 11-locking ring, 12-groove, 13-hydraulic oil channel, 14-guide groove. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] Depend on Figure 1 , Figure 2As shown, a floating hydraulic locking device for a static pressure workbench includes a base 1, which is fixed on the static pressure workbench. The base 1 is provided with a boss on the outside, and the upper surface of the boss is a plane. The plane is provided with a plurality of grooves 12, which are evenly distributed along the circumferential direction. A spring 2 is placed in a vertical direction in each groove 12, and the upper end of the spring 2 can extend out of the upper surface of the groove 12 when in a free state. A floating device is provided on the upper part of the boss of the base 1, and the floating device is located above the spring 2 after being sleeved on the outer part of the upper section of the base 1, and the floating device is movably connected to the base 1 through a guide thread pin 6. The middle section of the guide thread pin 6 is a smooth rod, and the lower end is a thread. After the smooth rod of the guide thread pin 6 passes through the floating device, the lower end is threadedly connected to the base 1, and there is a gap between the upper surface of the floating device and the locking surface of the upper end of the guide thread pin 6, so that the floating device has a movable margin in the vertical direction and can move up and down along the guide thread pin 6. That is, after the guide thread pin 6 connects the floating device to the base 1, the floating device can float up after receiving an upward force, and fall back on the spring 2 under the action of gravity after the external force is removed.

[0022] The upper section of the base 1 is provided with a wear-resistant guide sleeve 7, the floating device is sleeved on the outside of the wear-resistant guide sleeve 7, the wear-resistant guide sleeve 7 is fixed on the base 1, and the floating device is movably connected with the wear-resistant guide sleeve 7, that is, the floating device can move up and down along the wear-resistant guide sleeve 7. The wear-resistant guide sleeve 7 can prevent the floating device from wearing the base 1 when it is active.

[0023] The floating device includes a clamping upper plate 5 and a clamping lower plate 3, both of which are mounted on the outside of a wear-resistant guide sleeve 7. The clamping upper plate 5 and the clamping lower plate 3 are fixed by bolts so that the two are fixed as a whole and there is no margin of activity in the longitudinal direction. An annular step is provided on the contact surface of the clamping upper plate 5 and the clamping lower plate 3. The annular step can be provided on the clamping lower plate 3, or a small step can be provided on the clamping upper plate 5 and the clamping lower plate 3 respectively, so that an annular groove is formed between the two. A locking plate 4 is provided in the annular groove, and the thickness of the locking plate 4 is less than the height of the annular step, so that the locking plate 4 can still move in the vertical direction after the clamping upper plate 5 and the clamping lower plate 3 are fixed.

[0024] A guide groove 14 is provided below the annular step of the clamping lower plate 3. The guide groove 14 is annular, open at the top, and closed on the other three sides. A locking ring 11 is provided in the guide groove 14 in a vertical direction. In order to allow the hydraulic oil in the guide groove 14 to stably push the locking ring 11 upward, preferably, an annular groove can be processed on the inner side of the bottom of the guide groove 14. The width of the annular groove is smaller than the width of the guide groove 14, so that when the locking ring 11 falls on the bottom surface of the guide groove 14, the hydraulic oil can still enter the bottom of the locking ring 11. A hydraulic oil channel 13 is provided at the bottom of the guide groove 14. The upper end of the hydraulic oil channel 13 is connected to the groove at the bottom of the guide groove 14. The lower end of the hydraulic oil channel 13 passes through the rear end of the clamping lower plate 3 and is connected to the oil inlet joint 8. The oil inlet joint 8 is fixed on the outer wall of the clamping lower plate 3. The hydraulic unit is connected to the oil inlet joint 8.

[0025] Two guide rings 10 are arranged between the outer wall of the locking ring 11 and the inner wall of the guide groove 14, and a sealing ring 9 is arranged between the two guide rings 10. The guide ring 10 can play a guiding role in the process of the locking ring 11 moving up and down, and the sealing ring 9 plays a sealing role to prevent the hydraulic oil from leaking. The locking plate 4 is located between the locking ring 11 and the clamping upper plate 5, and the locking plate 4 is connected to the rotating parts of the static pressure workbench. When the hydraulic unit supplies hydraulic oil to the guide groove 14 through the hydraulic oil channel 13, the hydraulic oil pushes the locking ring 11 to move upward, and the locking ring 11 and the clamping upper plate 5 clamp the locking plate 4 together.

[0026] High-precision position sensors are installed on the clamping upper plate 5 and the locking ring 11 respectively, in order to detect the position information of the locking plate 4. In the locking process, the signal feedback forms a closed-loop control function, and in the process of loosening the locking plate 4, the position information of the locking plate 4 is also monitored in real time. The hydraulic unit realizes the automation and quantification of the locking force when the hydraulic locking device executes the action by controlling the hydraulic oil, which is convenient for operation. In addition, the hydraulic unit is equipped with a pressure monitoring sensor and a flow sensor, which can effectively monitor the stability of the oil pressure and the stability of the flow. In combination with the servo oil pump, the hydraulic system forms a closed-loop control, which ensures the stability and reliability of the hydraulic oil, and avoids the pressure change of the hydraulic oil from affecting the locking effect of the static pressure workbench, thereby ensuring the processing effect.

[0027] In the present invention, the floating device is rigidly connected by the clamping lower plate 3 and the clamping upper plate 5 through the hexagon socket screw to form a whole. The floating device can move up and down along the guide thread pin 6 and the wear-resistant guide sleeve 7 to play a floating role. The force center is self-adjusted through the floating effect, so that the locking plate 4 can always be in the center position of the clamping lower plate 3 and the clamping upper plate 5, avoiding the hydraulic locking force from acting on the locking plate 4 and causing the locking plate to deform. When the hydraulic unit supplies oil, the hydraulic oil enters the bottom of the guide groove 14 through the oil inlet joint 8 and the hydraulic oil channel 13, pushing the locking ring 11 to move upward, and the locking ring 11 pushes the locking plate 4 upward to float the locking plate 4. At the same time, the locking ring 11 and the clamping upper plate 5 firmly clamp the locking plate 4 to achieve the locking function. When the hydraulic unit stops supplying oil, the locking ring 11 falls down, loosening the clamping and support of the locking plate 4. At the same time, since the base 1 is provided with a spring 2, the support of the spring 2 can prevent the lower surface of the clamping upper plate 5 from contacting the upper surface of the locking plate 4 due to the deadweight of the parts, thereby avoiding abnormal movement of the static pressure workbench due to friction between the two surfaces.

[0028] The present invention effectively controls the hydraulic oil through the external hydraulic control unit, realizes the automation and quantification of the locking force when the hydraulic locking device performs the action, and is convenient for operation. In addition, a pressure monitoring sensor and a flow sensor are added to the hydraulic control unit, the purpose is to effectively monitor the stability of the oil pressure and the stability of the flow, and the servo oil pump is combined to realize the closed-loop control of the hydraulic system, which ensures the stability and reliability of the hydraulic oil, avoids the pressure change of the hydraulic oil affecting the locking effect of the static pressure workbench, thereby ensuring the processing effect, and forming the first layer of monitoring protection during use. At the same time, a high-precision position sensor is installed on the clamping upper plate and the locking ring, the purpose is to detect the position information of the locking plate, and the closed-loop control function is formed through the feedback of the signal during the locking process. In the process of loosening, the position information of the locking plate is also monitored in real time to avoid the locking plate and the clamping upper plate or the locking ring contacting and causing friction and damage during the continuous rotation of the static pressure workbench after the locking device is loosened, which affects the service life of the static pressure workbench, and realizes the second layer of monitoring and protection function of the static pressure workbench, thereby realizing the improvement of the working reliability and stability of the static pressure workbench, and ensuring the high-precision positioning effect of the static pressure workbench.

[0029] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A floating hydraulic locking device for a static pressure workbench, comprising a base (1), the base (1) being fixed on the static pressure workbench, characterized in that: The base (1) is provided with a boss on the outside, with a plurality of grooves (12) formed on the boss, and a spring (2) is provided in the groove (12); a floating device is provided on the upper part of the boss of the base (1), and the floating device is movably connected to the base (1) via a guide threaded pin (6); The floating device comprises a clamping upper plate (5) and a clamping lower plate (3), wherein the clamping upper plate (5) and the clamping lower plate (3) are fixed by bolts; a guide groove (14) is formed on the upper part of the clamping lower plate (3), and a locking ring (11) is arranged in a vertical direction in the guide groove (14); the bottom of the guide groove (14) is connected to a hydraulic unit via a hydraulic oil channel (13); a locking plate (4) is arranged between the locking ring (11) and the clamping upper plate (5).

2. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: An annular step is formed on the contact surfaces of the clamping lower plate (3) and the clamping upper plate (5); the locking plate (4) is located on the upper part of the annular step, and the thickness of the locking plate (4) is smaller than the height of the annular step.

3. The floating hydraulic locking device for a static pressure workbench according to claim 2, characterized in that: The locking disk (4) is connected to the rotating part of the static pressure workbench.

4. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: A wear-resistant guide sleeve (7) is fixed to the outside of the base (1), and the floating device is sleeved on the outside of the wear-resistant guide sleeve (7).

5. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: Two guide rings (10) are provided between the outer wall of the locking ring (11) and the inner wall of the guide groove (14), and a sealing ring (9) is provided between the two guide rings (10).

6. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: After the guide thread pin (6) passes through the floating device, the lower end is connected to the base (1) through a thread, and there is a gap between the upper surface of the floating device and the locking surface of the upper end of the guide thread pin (6).

7. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: Position sensors are fixed on the clamping upper disk (5) and the locking ring (11) and are used to detect position information of the locking disk (4).

8. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: An annular groove is formed on the bottom surface of the guide groove (14), the width of the annular groove is smaller than the width of the guide groove (14), and the bottom of the annular groove is in communication with the hydraulic oil channel (13).

9. The floating hydraulic locking device for a static pressure workbench according to claim 1, characterized in that: The hydraulic unit is provided with a pressure sensor and a flow sensor.

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