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CN-117798693-B - Hydraulic jacking device

CN117798693BCN 117798693 BCN117798693 BCN 117798693BCN-117798693-B

Abstract

The invention discloses a hydraulic tightening device, which is characterized in that one end of a base body is provided with a cylinder hole, the other end of the base body is provided with a reducing through hole, a tightening mechanism comprises a connecting plate, a piston rod, a tip, a threaded blanking cover and an end cover, the piston rod, the tip, the threaded blanking cover and the connecting shaft are positioned in the reducing through hole of the base body, the threaded blanking cover is fixed at the inner end part of the piston rod, the tip is slidably assembled in the center reducing hole of the piston rod in a micro-gap manner, a pressure spring penetrates between the tip and the threaded blanking cover, the guide sleeve is assembled at one end in the reducing through hole of the base body in an interference manner, the guide shaft is slidably assembled in the guide sleeve in a micro-gap manner, one end of the connecting shaft is crimped on the spring in a groove at the upper end of the guide shaft and stretches out and draws back by a spring plunger controller, and the tip and the guide shaft are connected together through the connecting plate. The invention not only can tightly jack and position the processing workpiece, but also has the function of pre-positioning, has high stability and reliability, compact structure and small volume, and is easy to install and process the processing workpiece and very convenient to use.

Inventors

  • BAI TAO

Assignees

  • 保定向阳航空精密机械有限公司

Dates

Publication Date
20260512
Application Date
20231228

Claims (8)

  1. 1. A hydraulic jacking device is characterized by comprising a base body (1), a jacking mechanism and a pre-positioning mechanism, wherein a cylinder hole is formed in one end of the base body (1), a variable-diameter through hole is formed in the other end of the base body, the jacking mechanism comprises a connecting plate (5), a piston rod (3), a tip (4), a threaded plug cover (16) and an end cover (2), the piston rod (3) is slidably connected in the cylinder hole of the base body (1) through a sealing ring I (20), the lower end of the piston rod is slidably connected in a central hole of the end cover (2) through a sealing ring II (17), an ejection oil port (29) and a retraction oil port (30) which are respectively communicated with the upper end and the lower end of the cylinder hole of the base body are arranged on the base body (1), the end cover (2) is fixed at the end of the cylinder hole of the base body (1) in a sealing mode, a threaded central step hole is formed in the center of the piston rod (3), a positioning step (31) matched with the outer end face of the piston rod (3), the outer end of the tip (4) is arranged at the outer end of the tip, the outer end of the positioning step (4) is arranged at the outer end of the tip (31) and is matched with the outer end face of the workpiece, the threaded plug cover is in a tapered shape, the threaded center hole is formed in the shape, the threaded center hole is matched with the threaded center hole of the outer end of the tip (3, the diameter of the optical axis part of the piston rod (3) is smaller than that of the center reducing hole, the center (4) is slidably assembled in the center reducing hole of the piston rod (3) in a micro-gap manner, the outer end part of the center (4) penetrates through a fixing hole at one end of the connecting plate (5) and is fixed on the connecting plate (5), the other end part of the center and the optical axis part of the threaded plug (16) are sleeved with a pressure spring (22), the elastic force of the pressure spring (22) ensures that the center (4) does not retract along with the piston rod (3) and remains at the original position when the piston rod (3) is retracted, the pre-positioning mechanism comprises a guide shaft (6), a guide sleeve (8) and a connecting shaft, the guide sleeve (8) is assembled at one end of the reducing through hole of the base body (1) in an interference manner, the guide shaft (6) is slidably assembled in the guide sleeve (8) in a micro-gap manner, one end of the guide shaft (6) is fixed at the other end of the connecting plate (5) and is provided with a mounting groove, the spring (14) is arranged in the mounting groove, the connecting shaft is arranged in the base body (1) in the reducing through hole, one end part of the guide shaft is slidably assembled in the reducing through the through hole in a certain range, and the other end of the guide shaft is slidably assembled in the micro-gap (14), the outer circle of the other end part is provided with a sliding groove of a spring plunger (11), a connecting block (27) is fixed on the base body (1) at the position where the connecting shaft penetrates out of the reducing through hole of the base body (1), a connecting shaft through hole and a threaded hole which are mutually perpendicular are formed in the connecting block (27), the connecting shaft penetrates through the connecting shaft through hole of the connecting block (27), the spring plunger (11) is tightly pressed and fixed in the threaded hole of the connecting block (27) by a nut (12) and is propped against the sliding groove of the connecting shaft, two ends of the sliding groove of the connecting shaft are provided with a groove I and a groove II which limit the spring plunger (11), and the groove I and the groove II respectively correspond to ejection and retraction states of the center (4).
  2. 2. The hydraulic jacking device according to claim 1, wherein the upper end portion of the center (4) has a specific structure that a threaded hole I is formed in the upper end face of the center (4), a U-shaped base plate (28) with a through hole in the center is buckled at the upper end of the center (4), the U-shaped base plate (28) is fixed on the center (4) through a screw I (19), and the pressure spring (22) is sleeved outside an optical axis portion of a threaded blanking cover (16) and the screw I (19).
  3. 3. The hydraulic jacking device according to claim 1, wherein the upper end portion of the center (4) has a specific structure that the upper end portion of the center (4) is thinned and protrudes a limiting protrusion, and the pressure spring (22) is sleeved outside the optical axis portion of the threaded blanking cover (16) and the upper end portion of the center (4).
  4. 4. The hydraulic tightening device according to claim 1 or 2 is characterized in that the connecting shaft consists of a connecting shaft I (7) and a connecting shaft II (9), the connecting shaft II (9) and the connecting shaft I (7) are connected in a T-shaped structure, the connecting shaft II (9) and the connecting shaft I (7) are respectively provided with a T-shaped limit groove and a T-shaped bulge or a T-shaped bulge and a T-shaped limit groove which are matched with each other, and a handle (10) is fixed at the outer end of the connecting shaft II (9).
  5. 5. The hydraulic tightening device according to claim 3, wherein the connecting shaft has a structure that one end portion is slidably fitted in the installation groove of the guide shaft (6) in a micro-gap manner within a certain range, cylindrical pin sliding grooves are symmetrically distributed on the inner wall of the installation groove of the guide shaft (6), cylindrical pins (13) are fixed on the connecting shaft I (7), and two ends of the cylindrical pins (13) are placed in the two cylindrical pin sliding grooves.
  6. 6. The hydraulic tightening device according to claim 4, wherein the outer end surface of the piston rod (3) is a positioning conical surface I, and the surface, opposite to the outer end surface of the piston rod (3), of the positioning step (31) of the center (4) is a positioning conical surface II matched with the positioning conical surface I.
  7. 7. The hydraulic tightening device according to claim 3, wherein the outer end surface of the piston rod (3) is a positioning conical surface I, and the surface, opposite to the outer end surface of the piston rod (3), of the positioning step (31) of the center (4) is a positioning conical surface II matched with the positioning conical surface I.
  8. 8. The hydraulic tightening device according to claim 1 or 2, wherein the outer end surface of the piston rod (3) is a positioning conical surface I, and the surface, opposite to the outer end surface of the piston rod (3), of the positioning step (31) of the center (4) is a positioning conical surface II matched with the positioning conical surface I.

Description

Hydraulic jacking device Technical Field The invention belongs to the field of machining and relates to a hydraulic tightening device. Background In machining, the situation that a workpiece needs to be machined after hole positioning and jacking is frequently encountered, the center is directly and rigidly fixed on the piston rod in the traditional method, the center is directly driven by the oil cylinder to jack, a pre-positioning mechanism is additionally needed to be made to ensure that the relative positions of the center and the hole in the machined workpiece are stable, and therefore the clamping structure is large and complex, and additional difficulty is caused to machining of the workpiece. Disclosure of Invention The invention aims to solve the problems in the prior art and provide the hydraulic tightening device which has a preset function, can not only perform the preset function on the positioning hole on the machined workpiece, but also tighten and position the machined workpiece, is easy to enter the workpiece positioning hole during preset positioning, is stable and reliable during tightening and positioning the workpiece, has a compact structure and relatively small volume, is easy to install and operate, and is very convenient to use. In order to achieve the aim, the technical scheme of the invention is that the hydraulic jacking device comprises a base body, a jacking mechanism and a pre-positioning mechanism; one end of the basal body is provided with a cylinder hole, and the other end is provided with a reducing through hole; the jacking mechanism comprises a connecting plate, a piston rod positioned in a cylinder hole at one end of the matrix, a center, a threaded blanking cover and an end cover; the upper end of the piston rod is slidably connected in a cylinder hole of a base body through a sealing ring I, the lower end of the piston rod is slidably connected in a central hole of an end cover through a sealing ring II, an ejection oil port and a retraction oil port which are respectively communicated with the upper end and the lower end of the cylinder hole are arranged on the base body, the end cover is fixed on the end part of the cylinder hole of the base body in a sealing manner, a threaded central step hole is arranged at the center of the piston rod, a positioning step matched with the outer end surface of the piston rod is arranged at the outer end of the center, the outer end of the center is arranged in a shape matched with the positioning hole of a workpiece, the tip part of the center is in a conical shape, the thread plug cover is fixed on the upper end of the central diameter-changing hole of the piston rod, the diameter of an optical axis part of the center is smaller than the central diameter-changing hole of the piston rod, the center is slidably arranged in the central diameter-changing hole of the piston rod in a micro-gap manner, the outer end part of the center is penetrated in a fixing hole of one end of the connecting plate and is fixed on the connecting plate, the other end of the center of the piston rod and the optical axis part of the center is sleeved with a pressure spring, the elastic force of the pressure spring ensures that the center does not retract and remains in the original position when the piston rod is in the optical axis, the guide shaft is arranged at the position, the preset positioning mechanism comprises a guide shaft, the guide shaft is arranged in the guide shaft and the guide shaft, the guide shaft is sleeved in the guide shaft, the guide shaft is arranged in the guide shaft, and the guide shaft is arranged in the end of the guide shaft, and the guide sleeve is arranged in the guide shaft, and the guide sleeve is arranged in the guide sleeve, and the guide sleeve is and the, the other end of the connecting shaft is provided with a mounting groove, a spring is arranged in the mounting groove, one end of the connecting shaft is arranged in the variable-diameter through hole of the base body in a sliding way in a certain range, the end face of the connecting shaft is pressed and connected with the spring in a pressing way, the other end of the connecting shaft penetrates out of the variable-diameter through hole of the base body, the outer circle of the other end of the connecting shaft is provided with a sliding groove of a spring plunger, the base body at the position where the connecting shaft penetrates out of the variable-diameter through hole of the base body is fixedly provided with a connecting shaft through hole and a threaded hole which are mutually perpendicular, the connecting shaft penetrates through the connecting shaft through hole of the connecting block, the spring plunger is pressed and fixed in the threaded hole of the connecting block by a nut and is propped against the sliding groove of the connecting shaft, two ends of the sliding groove of the connecting shaft are provided with a groove I and a groove II which limit