A pressure sensing mechanism for a hydraulic press

Abstract

The present invention relates to a hydraulic press component, specifically a pressure sensing mechanism of a hydraulic press. It includes a pressure head of the hydraulic press and a piston rod of a driving cylinder of the hydraulic press. A pressure plate is arranged above the pressure head, and the pressure plate has a center hole. The lower end of the piston rod passes through the center hole of the pressure plate and extends below the pressure plate. A force transmission head is fixed to the lower end of the piston rod, and a pressure sensor is arranged on the pressure head below the force transmission head. The pressure head is characterized in that guide columns are evenly distributed around the pressure head, and the pressure plates corresponding to the guide columns are provided with vertical through holes. The upper ends of the guide columns pass through the vertical through holes and extend onto the pressure plate. The upper ends of the guide columns are processed with external threads, and the upper ends of the guide columns are covered with adjusting nuts. The outer diameter of the adjusting nuts is larger than the aperture of the vertical through holes. There are floating springs on the section of the guide columns between the pressure plate and the pressure head. The pressure sensing mechanism has low requirements on the processing accuracy of parts, and the process of adjusting parallelism is relatively simple.

Description

Technical Field

[0001] The present invention relates to a hydraulic press assembly, in particular to a pressure sensing mechanism of a hydraulic press for monitoring the pressing force of the hydraulic press. Background Art

[0002] It is well known in the press fitting industry that a pressure sensing mechanism needs to be installed in a hydraulic press used for press fitting certain workpieces.

[0003] At present, the pressure sensing mechanism of the hydraulic press includes a pressure head of the hydraulic press and a piston rod of the hydraulic press driving cylinder. A horizontally arranged pressure plate is arranged above the pressure head, and the pressure plate has a center hole. The lower end of the piston rod passes through the center hole of the pressure plate and extends below the pressure plate. A force transmission head is fixed to the lower end of the piston rod. The upper surface of the force transmission head is against the lower plate surface of the pressure plate. A pressure sensor is arranged on the pressure head below the force transmission head. There are connecting plates between the pressure head and the pressure plate on both sides of the pressure sensor. In order to ensure accuracy, there needs to be good parallelism between the lower plane of the pressure head and the working table of the hydraulic press. The pressure head and the pressure plate of this pressure sensing mechanism are connected by a connecting plate, and the processing accuracy of the connecting plate is required to be high. Moreover, after the pressure sensing mechanism of this hydraulic press is installed, the parallelism between the lower plane of the pressure head and the working table panel is completely guaranteed by the processing accuracy. Once there is an error in the processing accuracy, the plate can only be dismantled, ground and reassembled, and the process of adjusting the parallelism is more cumbersome. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a pressure sensing mechanism for a hydraulic press, which has low requirements on the machining accuracy of parts and a simple process for adjusting parallelism.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] A pressure sensing mechanism of a hydraulic press of the present invention comprises a pressure head of the hydraulic press and a piston rod of a driving cylinder of the hydraulic press. A horizontally arranged pressure plate is arranged above the pressure head, and the pressure plate has a center hole. The lower end of the piston rod passes through the center hole of the pressure plate and extends below the pressure plate. A force transmission head is fixed to the lower end of the piston rod, and the upper surface of the force transmission head abuts against the lower plate surface of the pressure plate. A pressure sensor is arranged on the pressure head below the force transmission head. The characteristic is that vertically arranged guide columns are evenly distributed around the pressure head, and the pressure plates corresponding to the guide columns are provided with vertical through holes. The upper ends of the guide columns pass through the vertical through holes and extend onto the pressure plate. The guide columns and the corresponding vertical through holes are matched in a sliding manner. The upper ends of the guide columns are processed with external threads, and the upper ends of the guide columns are sleeved with adjustment nuts. The outer diameter of the adjustment nuts is larger than the aperture of the vertical through holes. The section of the guide columns between the pressure plate and the pressure head is provided with floating springs. There are guide sleeves between the guide columns and the vertical through holes. The upper end of the guide sleeve extends out from the upper end of the vertical through hole, and there is an annular outer flange on the extended end of the guide sleeve, and the lower surface of the annular outer flange abuts against the pressure plate; an annular flange is fixed on the upper surface of the pressure plate around the vertical through hole, and the inner side of the lower end surface of the annular flange is pressed on the annular outer flange of the guide sleeve. The annular flanges are all sleeved on the corresponding guide columns, and there is a dust ring between the inner ring surface of the annular flange and the outer wall of the guide column, and the guide column and the dust ring are in a sliding fit. There are spacers between the annular flange and the corresponding adjustment nut. There is a pit on the upper surface of the force transmission head, and horizontal threaded holes connected to the pit are evenly distributed on the outer wall of the force transmission head along its circumference. The piston rod is located in the pit, and there are tightening screws in the horizontal threaded holes, and the tightening screws are against the side wall of the piston rod.

[0007] Wherein, the adjusting nut comprises a cap nut and a thin nut, and the cap nut and the thin nut are sequentially sleeved on the guide column from top to bottom.

[0008] The pressure head is a square pressure head, and there are four guide columns, which are respectively located at the four corners of the pressure head.

[0009] The above solution has the following advantages:

[0010] Since the pressure head of the pressure sensing mechanism of the hydraulic press of the present invention is uniformly provided with guide columns around, the pressure plates corresponding to the guide columns are provided with vertical through holes, the upper ends of the guide columns pass through the vertical through holes and extend onto the pressure plates, the guide columns and the corresponding vertical through holes are slidably matched, the upper ends of the guide columns are processed with external threads, and the upper ends of the guide columns are covered with adjustment nuts, the outer diameter of the adjustment nuts is larger than the aperture of the vertical through holes, and the guide columns located between the pressure plates and the pressure head are provided with floating springs. When in use, the parallelism between the lower plane of the pressure head and the worktable panel can be adjusted by adjusting the nuts, thereby reducing the processing accuracy of the columns and greatly simplifying the process of adjusting the parallelism. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1is a schematic structural diagram of a pressure sensing mechanism of a hydraulic press of the present invention;

[0012] Figure 2 for Figure 1 A magnified view of part A;

[0013] Figure 3 for Figure 1 A magnified view of part B;

[0014] Figure 4 It is a three-dimensional schematic diagram of the pressure sensing mechanism of the hydraulic press of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0016] like Figures 1 to 4 As shown, a pressure sensing mechanism of a hydraulic press of the present invention comprises a pressure head 1 of the hydraulic press and a piston rod 7 of a driving cylinder of the hydraulic press. A horizontally arranged pressing plate 4 is arranged above the pressure head 1, and the pressing plate 4 has a central hole. The lower end of the piston rod 7 passes through the central hole of the pressing plate 4 and extends below the pressing plate 4. A force transmission head 9 is fixed to the lower end of the piston rod 7, and the upper surface of the force transmission head 9 abuts against the lower plate surface of the pressing plate 4. A pressure sensor 10 is arranged on the pressure head 1 below the force transmission head 9. The characteristic is that vertically arranged guide columns 2 are evenly distributed around the pressure head 1, and the pressing plates 4 corresponding to the guide columns 2 are all provided with vertical through holes. The upper ends of the guide columns 2 pass through the vertical through holes and extend onto the pressing plates 4. The guide columns 2 and the corresponding vertical through holes are matched in a sliding manner. The upper ends of the guide columns 2 are processed with external threads, and the upper ends of the guide columns 2 are covered with adjusting nuts. The outer diameter of the adjusting nuts is larger than the diameter of the vertical through holes. The section of the guide columns 2 located between the pressing plate 4 and the pressure head 1 is provided with floating springs 3.

[0017] The adjusting nut comprises a cap nut 6 and a thin nut 5, and the cap nut 6 and the thin nut 5 are sequentially sleeved on the guide column 2 from top to bottom. The advantage of using a double-layer nut is that the loosening effect is good, so that the pressing accuracy is high.

[0018] There is a guide sleeve 14 between the guide column 2 and the vertical through hole. The upper end of the guide sleeve 14 extends from the upper end of the vertical through hole, and there is an annular outer flange 14-1 on the extended end of the guide sleeve 14, and the lower surface of the annular outer flange 14-1 abuts against the pressure plate 4; an annular flange 12 is fixed on the upper plate surface of the pressure plate 4 around the vertical through hole, and the inner side of the lower end surface of the annular flange 12 is pressed on the annular outer flange 14-1 of the guide sleeve 14, and the annular flange 12 is sleeved on the corresponding guide column 2, and there is a dust ring 13 between the inner ring surface of the annular flange 12 and the outer wall of the guide column 2, and the guide column 2 and the dust ring 13 are in sliding fit. There is a spacer sleeve 11 between the annular flange 12 and the corresponding adjustment nut.

[0019] There is a pit 16 on the upper surface of the force transmission head 9, and horizontal threaded holes 15 connected to the pit 16 are evenly distributed on the outer wall of the force transmission head 9 along its circumference. The piston rod 7 is located in the pit 16, and there are jacking screws 8 in the horizontal threaded holes 15, and the jacking screws 8 are against the side wall of the piston rod 7. The advantage of this design is that after the frame of the pressure head 1, the pressure plate 4 and the guide column 2 are spliced, when the force transmission head 9 is installed, because the force transmission head 9 is tightened by the horizontal jacking screw 8, and the force transmission head 9 is surrounded by the guide column 2, the space is wide, and tightening the jacking screw 8 will not be interfered, which is convenient for the installation of the force transmission head 9.

[0020] The pressure head 1 is a square pressure head 1 , and there are four guide posts 2 , which are respectively located at the four corners of the pressure head 1 .

[0021] In this embodiment, the lock guide column 2 is made of steel, and the guide sleeve 14 is a copper sleeve. The advantage of this improvement is that when two different materials slide up and down for a long time, it is not easy to be burred, and the service life is long.

[0022] The pressure sensing mechanism of this hydraulic press can adjust the parallelism between the lower plane of the pressure head 1 and the worktable panel by adjusting the nut, thereby reducing the processing accuracy of the column and greatly simplifying the process of adjusting the parallelism. In addition, the use of the guide column 2 instead of the connecting plate of the prior art makes the installation process of the force transmission head 9 simple. At the same time, the steel guide column 2 and the copper guide sleeve 14 are matched, so that the two are not easy to fuzz during the sliding process, which greatly prolongs their service life.

Claims

1. A pressure sensing mechanism of a hydraulic press, comprising a pressure head (1) of the hydraulic press and a piston rod (7) of a driving cylinder of the hydraulic press; a horizontally arranged pressing plate (4) is arranged above the pressure head (1), the pressing plate (4) having a central hole, the lower end of the piston rod (7) passes through the central hole of the pressing plate (4) and extends below the pressing plate (4), a force transmission head (9) is fixed to the lower end of the piston rod (7), the upper surface of the force transmission head (9) abuts against the lower plate surface of the pressing plate (4), and a pressure sensor (10) is provided on the pressure head (1) below the force transmission head (9); characterized in that The pressure head (1) is evenly distributed with vertically arranged guide columns (2) around it, and the corresponding pressure plates (4) of the guide columns (2) are all provided with vertical through holes, and the upper ends of the guide columns (2) extend through the vertical through holes to the pressure plates (4), and the guide columns (2) and the corresponding vertical through holes are slidably matched, and the upper ends of the guide columns (2) are processed with external threads, and the upper ends of the guide columns (2) are sleeved with adjustment nuts, and the outer diameter of the adjustment nuts is larger than the hole diameter of the vertical through holes, and the section of the guide columns (2) located between the pressure plates (4) and the pressure head (1) is provided with floating springs (3); the guide columns (2) and the vertical through holes are each provided with guide sleeves (14); the upper ends of the guide sleeves (14) extend from the upper ends of the vertical through holes, and the extended ends of the guide sleeves (14) are provided with an annular outer flange (14-1), and the lower surface of the annular outer flange (14-1) abuts against the pressure plates (4); the vertical through holes are An annular flange (12) is fixed on the upper plate surface of the pressure plate (4), and the inner side of the lower end surface of the annular flange (12) is pressed on the annular outer flange (14-1) of the guide sleeve (14). The annular flange (12) is sleeved on the corresponding guide column (2), and a dust ring (13) is provided between the inner ring surface of the annular flange (12) and the outer wall of the guide column (2), and the guide column (2) and the dust ring (13) are slidingly matched; a spacer sleeve (11) is provided between the annular flange (12) and the corresponding adjustment nut; a pit (16) is provided on the upper surface of the force transmission head (9), and horizontal threaded holes (15) connected to the pit (16) are uniformly distributed on the outer wall of the force transmission head (9) along its circumference, and the piston rod (7) is located in the pit (16), and a tightening screw (8) is provided in the horizontal threaded hole (15), and the tightening screw (8) is abutted against the side wall of the piston rod (7).

2. The pressure sensing mechanism of the hydraulic press according to claim 1, characterized in that The adjusting nut comprises a cap nut (6) and a thin nut (5), and the cap nut (6) and the thin nut (5) are sequentially sleeved on the guide column (2) from top to bottom.

3. The pressure sensing mechanism of a hydraulic press according to any one of claims 1 to 2, characterized in that The pressure head (1) is a square pressure head (1), and there are four guide columns (2), which are respectively located at the four corners of the pressure head (1).

Images