Hydraulic overload protection structure of press machine

Abstract

The utility model relates to the technical field of press machine hydraulic overload protection structures, in particular to a press machine hydraulic overload protection structure which comprises a press machine table, a supporting column arranged at the top of the press machine table, a hydraulic mechanism supported by the middle of the top of the supporting column, a piston arranged in the hydraulic mechanism, and a telescopic column connected to the bottom of the piston. Two groups of pressure relief holes are formed in the top of the piston, pressure springs are arranged at the bottoms of the pressure relief holes, and telescopic heads are connected to the tops of the pressure springs; the hydraulic overload protection structure of the press machine has the beneficial effects that when the press machine works, the hand-operated direction valve is adjusted and connected, the hand-operated direction valve starts to control the hydraulic pump to supply hydraulic oil to the first oil inlet and outlet pipe, and the hydraulic oil enters an upper cavity in the top of the hydraulic mechanism through the first oil inlet and outlet pipe; and the hydraulic oil begins to press the piston, so that the piston drives a telescopic column at the bottom to stretch downwards, and a pressing head connected with the bottom of the telescopic column is driven to press the workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of a hydraulic overload protection structure for a press, in particular to a hydraulic overload protection structure for a press. Background Art

[0002] Press (including punching machine and hydraulic press) is a kind of general-purpose press with exquisite structure. It has the characteristics of wide application and high production efficiency. Press can be widely used in cutting, punching, blanking, bending, riveting and forming processes.

[0003] In the prior art, the hydraulic mechanism of the press is mostly protected by a muscle-enhanced safety pressure regulating valve to prevent the hydraulic mechanism of the press from being overloaded and causing damage to the press.

[0004] However, in the prior art, the hydraulic overload protection of the press machine is provided by adding a safety regulating valve, which not only increases the external pipeline connection, but also requires a certain buffer time for the safety regulating valve to work, and cannot release the hydraulic pressure of the press machine in time. Utility Model Content

[0005] The purpose of the utility model is to provide a hydraulic overload protection structure for a press machine to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a press platform, a support column is arranged on the top of the press platform, the middle part of the top of the support column supports the hydraulic mechanism, a piston is arranged inside the hydraulic mechanism, the bottom of the piston is connected to the telescopic column, two groups of pressure relief holes are opened on the top of the piston, a pressure spring is arranged at the bottom of the pressure relief hole, and the top of the pressure spring is connected to the telescopic head.

[0007] Preferably, the upper part of the piston is an upper chamber, and the side of the top of the upper chamber is connected to the first inlet and outlet oil pipe, and the hydraulic oil flows in and out of the first inlet and outlet oil pipe into the upper chamber to press the piston down.

[0008] Preferably, the bottom of the piston is a lower chamber, and the bottom side of the lower chamber is connected to a second inlet and outlet oil pipe, and hydraulic oil can flow into and out of the lower chamber from the second inlet and outlet oil pipe to support the piston to rise.

[0009] Preferably, a first O-ring is sleeved on the middle part of the piston, and the first O-ring seals the upper chamber and the lower chamber inside the hydraulic mechanism to prevent the upper chamber from communicating with the lower chamber. The bottom of the telescopic column is connected to the pressure head, and the piston can drive the pressure head connected to the bottom of the telescopic column to extend and retract up and down.

[0010] Preferably, the other ends of the first inlet and outlet oil pipes and the second inlet and outlet oil pipes are connected to a manual reversing valve, which is arranged on the top of the hydraulic pump and connected to the hydraulic pump. The manual reversing valve can control the hydraulic pump to selectively supply hydraulic oil to the first inlet and outlet oil pipes and the second inlet and outlet oil pipes.

[0011] Preferably, guide grooves are provided on both sides of the top of the telescopic head, and pressure relief grooves are provided at the ends of the guide grooves. The pressure relief grooves are communicated with the lower chamber, and the hydraulic oil can flow from the guide grooves into the pressure relief grooves, and then from the pressure relief grooves into the lower chamber to perform overload pressure relief.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model discloses a hydraulic overload protection structure of a press machine. When the press machine is working, the manual reversing valve is adjusted and the manual reversing valve starts to control the hydraulic pump to supply hydraulic oil to the first inlet and outlet oil pipes. The hydraulic oil enters the upper chamber at the top of the hydraulic mechanism through the first inlet and outlet oil pipes. The hydraulic oil starts to press the piston, so that the piston drives the telescopic column at the bottom to extend and retract downward, and drives the pressure head connected to the bottom of the telescopic column to press the workpiece. At the same time, the hydraulic oil in the lower chamber flows back to the hydraulic pump through the second inlet and outlet oil pipes to form a circulation. The first O-ring is sleeved around the outer side of the piston. The first O-ring seals the lower chamber and the piston. ; When the hydraulic oil in the upper chamber increases sharply and the pressure rises sharply, and an overload is about to occur, the hydraulic oil can apply pressure to the telescopic head in the pressure relief hole opened on the top of the piston, so that the pressure spring drives the telescopic head to shrink inward, so that the telescopic head opens the seal on the guide groove, and the hydraulic oil enters the guide groove through the pressure, and then flows into the lower chamber from the pressure relief groove opened at the bottom of the other end of the guide groove for pressure relief, for overload protection, a second O-ring is sleeved on the outside of the telescopic head, and the second O-ring seals the pressure relief hole to prevent the hydraulic oil from entering the guide groove from the gap between the pressure relief hole and the telescopic head when no overload occurs, thereby affecting the normal operation of the hydraulic mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the hydraulic mechanism of the utility model;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the piston of the utility model.

[0017] In the figure: press platform 1, support column 2, hydraulic mechanism 3, telescopic column 4, pressure head 5, first oil inlet and outlet pipes 6, second oil inlet and outlet pipes 7, manual reversing valve 8, hydraulic pump 9, upper chamber 10, lower chamber 11, piston 12, first O-ring 13, pressure relief hole 14, telescopic head 15, pressure spring 16, second O-ring 17, guide groove 18, pressure relief groove 19. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figures 1 to 3 The utility model provides a technical solution: a press machine 1, a support column 2 is arranged on the top of the press machine 1, a hydraulic mechanism 3 is supported in the middle of the top of the support column 2, a piston 12 is arranged inside the hydraulic mechanism 3, the bottom of the piston 12 is connected to the telescopic column 4, two groups of pressure relief holes 14 are opened on the top of the piston 12, a pressure spring 16 is arranged at the bottom of the pressure relief hole 14, and the top of the pressure spring 16 is connected to the telescopic head 15; the upper chamber 10 is above the piston 12, the side of the top of the upper chamber 10 is connected to the first inlet and outlet pipe 6, and the hydraulic oil enters and exits from the first inlet and outlet pipe 6 into the upper chamber 10 to press and hold the piston 12 down; the bottom of the piston 12 is the lower chamber 11, the side of the bottom of the lower chamber 11 is connected to the second inlet and outlet pipe 7, and the hydraulic oil can enter and exit from the second inlet and outlet pipe 7 into the lower chamber 11 to press and hold the piston 12 up; the middle part of the piston 12 is sleeved with There is a first O-ring 13, which seals the upper chamber 10 and the lower chamber 11 inside the hydraulic mechanism 3 to prevent the upper chamber 10 from communicating with the lower chamber 11. The bottom of the telescopic column 4 is connected to the pressure head 5, and the piston 12 can drive the pressure head 5 connected to the bottom of the telescopic column 4 to extend and retract up and down; the other ends of the first inlet and outlet oil pipes 6 and the second inlet and outlet oil pipes 7 are connected to the manual reversing valve 8, which is arranged on the top of the hydraulic pump 9 and connected to the hydraulic pump 9. The manual reversing valve 8 can control the hydraulic pump 9 to selectively supply hydraulic oil to the first inlet and outlet oil pipes 6 and the second inlet and outlet oil pipes 7; guide grooves 18 are provided on both sides of the top of the telescopic head 15, and pressure relief grooves 19 are provided at the ends of the guide grooves 18. The pressure relief grooves 19 are communicated with the lower chamber 11, and the hydraulic oil can flow from the guide grooves 18 into the pressure relief grooves 19, and then flow from the pressure relief grooves 19 into the lower chamber 11 for overload pressure relief.

[0020] The utility model proposes a hydraulic overload protection structure of a press machine. When the press machine is working, the manual reversing valve 8 is adjusted, and the manual reversing valve 8 starts to control the hydraulic pump 9 to supply hydraulic oil to the first inlet and outlet oil pipes 6. The hydraulic oil enters the upper chamber 10 at the top of the hydraulic mechanism 3 through the first inlet and outlet oil pipes 6. The hydraulic oil starts to press the piston 12, so that the piston 12 drives the telescopic column 4 at the bottom to extend and retract downward, and drives the pressure head 5 connected to the bottom of the telescopic column 4 to press the workpiece. At the same time, the hydraulic oil in the lower chamber 11 flows back to the hydraulic pump 9 through the second inlet and outlet oil pipes 7 to form a circulation. The first O-ring 13 is sleeved around the outer side of the piston 12. The first O-ring 13 isolates and seals the lower chamber 11 and the piston 12; when the upper chamber 12 The hydraulic oil in 10 increases sharply and the pressure rises sharply. When overload is about to occur, the hydraulic oil can apply pressure to the telescopic head 15 in the pressure relief hole 14 opened on the top of the piston 12, so that the pressure spring 16 drives the telescopic head 15 to shrink inward so that the telescopic head 15 opens the seal of the guide groove 18, and the hydraulic oil enters the guide groove 18 through the pressure, and then flows into the lower chamber 11 from the pressure relief groove 19 opened at the bottom of the other end of the guide groove 18 for pressure relief, so as to perform overload protection. A second O-ring 17 is sleeved on the outer side of the telescopic head 15, and the second O-ring 17 seals the pressure relief hole 14 to prevent the hydraulic oil from entering the guide groove 18 from the gap between the pressure relief hole 14 and the telescopic head 15 when no overload occurs, thereby affecting the normal operation of the hydraulic mechanism. Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A hydraulic overload protection structure for a press, characterized in that: include: A press machine (1), wherein a support column (2) is arranged on the top of the press machine (1), a hydraulic mechanism (3) is supported at the middle of the top of the support column (2), a piston (12) is arranged inside the hydraulic mechanism (3), the bottom of the piston (12) is connected to a telescopic column (4), two groups of pressure relief holes (14) are opened on the top of the piston (12), a pressure spring (16) is arranged at the bottom of the pressure relief hole (14), and the top of the pressure spring (16) is connected to a telescopic head (15); The telescopic head (15) has guide grooves (18) on both sides of the top of the telescopic head (15), and pressure relief grooves (19) are provided at the ends of the guide grooves (18). The pressure relief grooves (19) are communicated with the lower chamber (11), and the hydraulic oil can flow from the guide grooves (18) into the pressure relief grooves (19), and then flow from the pressure relief grooves (19) into the lower chamber (11) to relieve overload pressure.

2. A press hydraulic overload protection structure according to claim 1, characterized in that: The upper part of the piston (12) is an upper chamber (10), and the side of the top of the upper chamber (10) is connected to the first oil inlet and outlet pipe (6). Hydraulic oil flows in and out of the first oil inlet and outlet pipe (6) into the upper chamber (10) to press the piston (12) down.

3. A press hydraulic overload protection structure according to claim 2, characterized in that: The bottom of the piston (12) is a lower chamber (11), and the bottom side of the lower chamber (11) is connected to a second oil inlet and outlet pipe (7). Hydraulic oil can flow into and out of the lower chamber (11) from the second oil inlet and outlet pipe (7) to support the piston (12) to rise.

4. A press hydraulic overload protection structure according to claim 3, characterized in that: A first O-ring (13) is sleeved on the middle of the piston (12), and the first O-ring (13) seals the upper chamber (10) and the lower chamber (11) inside the hydraulic mechanism (3) to prevent the upper chamber (10) and the lower chamber (11) from communicating with each other. The bottom of the telescopic column (4) is connected to a pressure head (5), and the piston (12) can drive the pressure head (5) connected to the bottom of the telescopic column (4) to telescope up and down.

5. A press hydraulic overload protection structure according to claim 4, characterized in that: The other ends of the first inlet and outlet oil pipe (6) and the second inlet and outlet oil pipe (7) are connected to a manual reversing valve (8). The manual reversing valve (8) is arranged on the top of the hydraulic pump (9) and connected to the hydraulic pump (9). The manual reversing valve (8) can control the hydraulic pump (9) to selectively supply hydraulic oil to the first inlet and outlet oil pipe (6) and the second inlet and outlet oil pipe (7).

Images