A downward punching hydraulic foreign body detection device with a balancing cylinder

Abstract

The present invention provides a downward punching hydraulic foreign body detection device with a balancing cylinder, comprising a hydraulic system unit, a balancing cylinder, a fast-forward cylinder and a main cylinder; the balancing cylinder comprises an annular oil cylinder and a balancing cylinder piston arranged in the annular oil cylinder; the fast-forward cylinder comprises a fast-forward oil cylinder and a fast-forward cylinder piston arranged in the fast-forward oil cylinder, a T-shaped structure is arranged on the top of the fast-forward cylinder piston, a balancing cylinder piston is arranged on the top of the fast-forward cylinder, and the two are rigidly connected, and the T-shaped structure contacts the balancing cylinder piston during the downward process, and the lower end of the fast-forward cylinder piston is rigidly connected to the upper slider; the main cylinder comprises a main oil cylinder and a main cylinder piston arranged in the main oil cylinder, the main cylinder piston is rigidly connected to the upper slider, and the bottom of the main cylinder piston is directly opposite to the position where the product is placed on the lower table. The present invention is suitable for a device that can detect foreign bodies in the mold under rapid punching and relatively low electrical control requirements, and has the characteristics of high sensitivity, stable structure, effectiveness, simplicity, high efficiency and low cost.

Description

Technical Field

[0001] The invention mainly relates to the field of hydraulic rapid punching equipment, and in particular to a downward punching hydraulic foreign body detection device with a balancing cylinder. Background Art

[0002] This structure is aimed at foreign body detection in hydraulic rapid stamping equipment. Hydraulic punching machines, especially rapid hydraulic punching machines, require high sensitivity for foreign body detection. In particular, in the process of thick plate punching, if waste is not removed in time and is not discovered in time, it will threaten the safety of equipment and personnel.

[0003] The Chinese utility model patent has been published, application number CN201420430662.8, patent name: A punching buffer device for a large-surface stamping hydraulic press, application date: 20140731, the present invention relates to a punching buffer device for a large-surface stamping hydraulic press, including a buffer and a buffer cylinder, characterized in that one buffer cylinder is installed on each side of the base of the stamping hydraulic press, the sliders on both sides of the stamping hydraulic press are directly opposite to the plunger of the buffer cylinder, the two buffers are respectively connected to the buffer cylinders on the left and right sides, and the two buffer cylinders are also connected through a branch pipeline. The punching buffer device for a large-surface stamping hydraulic press described in the present invention utilizes two hydraulic system units connected by oil circuits to form the entire punching buffer device, so that the operation pace of the two buffer cylinders is highly consistent, thereby ensuring the balance of the buffer effect, without deflection, and improving the working stability of the hydraulic press. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a foreign body detection device that can meet the requirements of fast permission and high sensitivity, and has low requirements on electrical hardware. Specifically, the present invention provides a downward punching hydraulic foreign body detection device with a balance cylinder, including a hydraulic system unit, a balance cylinder 1, a fast-forward cylinder 2 and a main cylinder 3;

[0005] The balancing cylinder 1 comprises an annular oil cylinder 101 and a balancing cylinder piston 102 arranged in the annular oil cylinder 101;

[0006] The fast-forward cylinder 2 includes a fast-forward oil cylinder 201 and a fast-forward cylinder piston 202 disposed in the fast-forward oil cylinder 201. A T-shaped structure 4 is disposed on the top of the fast-forward cylinder piston 202. An annular oil cylinder 101 is disposed on the top of the fast-forward cylinder 201 and the two are rigidly connected. During the downward process, the T-shaped structure 4 contacts the balance cylinder piston 102, and the lower end of the fast-forward cylinder piston 202 is rigidly connected to the upper slider.

[0007] The master cylinder 3 includes a master oil cylinder 301 and a master cylinder piston 302 disposed in the master oil cylinder 301. The master cylinder piston 302 is rigidly connected to the upper slider, and the bottom of the master cylinder piston 302 faces the position where the product is placed on the lower table 5.

[0008] The hydraulic system unit is connected to the two groups of the balancing cylinder 1 and the fast-forward cylinder 2 on the left and right sides respectively.

[0009] Preferably, the fast-forward cylinder 2 moves downward or upward to drive the slider to move up and down.

[0010] Preferably, the hydraulic system unit includes a cartridge valve 11 and an A-way end, a B-way end and a C-way end connected to the cartridge valve 11;

[0011] The oil circuit at the A-way end is provided with a No. 1 low-pressure relief valve 12 and an upper cavity high-pressure safety valve 13 connected to the upper cavity of the fast-forward cylinder 2;

[0012] The oil circuit at the B circuit end is provided with a lower cavity high pressure safety valve 15 connected to the lower cavity of the fast forward cylinder 2;

[0013] The oil circuit at the C-circuit end is provided with a No. 2 low-pressure relief valve 16 and a balancing cylinder high-pressure safety valve 17 connected to the lower end of the annular oil cylinder 101 of the balancing cylinder 1 .

[0014] Preferably, a balancing valve 14 is further provided on the oil circuit between the A-road end and the B-road end.

[0015] Preferably, a proportional flow valve 22 is provided on the oil circuit at the oil outlet end of the cartridge valve 11, and the rest of the oil circuit is a directional control valve and a stop valve.

[0016] Preferably, an alarm device is also connected, and the alarm device is electrically connected to the displacement sensor and the time relay of the slider.

[0017] Preferably, the setting time of the time relay is 5s.

[0018] The beneficial effects of the present invention are as follows: the invention is suitable for rapid stamping and can detect foreign matter in the mold under relatively low electrical control requirements. The invention needs to have high sensitivity, and the influence of the equipment slider's deadweight and running inertia must be eliminated. A set of slider deadweight balance structure is added. In order to reduce costs, the pressure detection method using a high-response frequency PLC and a pressure sensor is not adopted. Instead, a high-low pressure switching method is adopted to reduce the detection pressure for judgment. The invention has the characteristics of stable structure, effectiveness, simplicity, high efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of step S1 of this embodiment;

[0020] Figure 2 This is a structural diagram of step S2 of this embodiment;

[0021] Figure 3 This is a structural diagram of step S3 of this embodiment;

[0022] Figure 4 This is a structural diagram of step S4 of this embodiment;

[0023] Figure 5 is a structural diagram of step S5 of this embodiment;

[0024] Figure 6 This is a structural diagram of step S6 of this embodiment;

[0025] Figure 7 is a structural diagram of a foreign body detection system in this embodiment;

[0026] In the figure,

[0027] 1. Balance cylinder, 101. Annular oil cylinder, 102. Balance cylinder piston;

[0028] 2. Fast-forward cylinder, 201. Fast-forward oil cylinder, 202. Fast-forward cylinder piston;

[0029] 3. Master cylinder, 301, master oil cylinder, 302, master cylinder piston;

[0030] 4. T-shaped structure;

[0031] 5. Get off the table;

[0032] 11. Cartridge valve; 12. No. 1 low-pressure relief valve; 13. Upper cavity high-pressure safety valve; 14. Balance valve; 15. Lower cavity high-pressure safety valve; 16. No. 2 low-pressure relief valve; 17. Balance cylinder high-pressure safety valve; 22. Proportional flow valve. DETAILED DESCRIPTION

[0033] In order to make the technical solution of the present invention better understood by the technical personnel in the field, and to make the above-mentioned features, purposes and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the embodiments. The embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0034] 7. If Figure 1-7 As shown, the present invention includes: a hydraulic system unit, a balance cylinder 1, a fast-forward cylinder 2 and a master cylinder 3;

[0035] The balancing cylinder 1 comprises an annular oil cylinder 101 and a balancing cylinder piston 102 arranged in the annular oil cylinder 101;

[0036] The fast-forward cylinder 2 comprises a fast-forward oil cylinder 201 and a fast-forward cylinder piston 202 arranged in the fast-forward oil cylinder 201, a T-shaped structure 4 is arranged on the top of the fast-forward cylinder piston 202, and a balancing cylinder piston 102 is arranged on the top of the fast-forward cylinder 201, and the two are rigidly connected. During the downward process, the T-shaped structure 4 contacts the balancing cylinder piston 102, and the lower end of the fast-forward cylinder piston 202 is rigidly connected to the upper slider;

[0037] The master cylinder 3 includes a master oil cylinder 301 and a master cylinder piston 302 disposed in the master oil cylinder 301. The master cylinder piston 302 is rigidly connected to the upper slider, and the bottom of the master cylinder piston 302 faces the position where the product is placed on the lower table 5.

[0038] The hydraulic system unit is connected to the two groups of the balancing cylinder 1 and the fast-forward cylinder 2 on the left and right sides respectively.

[0039] In this embodiment, preferably, the fast-forward cylinder 2 moves downward or upward to drive the slider to move up and down.

[0040] The above structure is provided to realize the rapid movement and detection process of the slider during the idle stroke, thereby improving the punching rhythm.

[0041] In this embodiment, the hydraulic system unit preferably includes a cartridge valve 11 and an A-way end, a B-way end and a C-way end connected to the cartridge valve 11;

[0042] The oil circuit at the A-way end is provided with a No. 1 low-pressure relief valve 12 and an upper cavity high-pressure safety valve 13 connected to the upper cavity of the fast-forward cylinder 2;

[0043] The oil circuit at the B circuit end is provided with a lower cavity high pressure safety valve 15 connected to the lower cavity of the fast forward cylinder 2;

[0044] The oil circuit at the C-circuit end is provided with a No. 2 low-pressure relief valve 16 and a balancing cylinder high-pressure safety valve 17 connected to the lower end of the annular oil cylinder 101 of the balancing cylinder 1 .

[0045] In this embodiment, preferably, a balancing valve 14 is further provided on the oil circuit between the A-road end and the B-road end.

[0046] Preferably in this embodiment, a proportional flow valve 22 is provided on the oil circuit of the oil outlet end of the cartridge valve 11, and the rest of the oil circuit is a directional control valve and a stop valve.

[0047] By setting the above structure, the proportional flow valve can control the flow rate by controlling the valve core opening size of the proportional flow valve, thereby controlling the running speed of the slider.

[0048] In this embodiment, preferably, an alarm device is also connected, and the alarm device is electrically connected to the displacement sensor and the time relay of the slider.

[0049] In this embodiment, preferably, the setting time of the time relay is 5s.

[0050] By setting the above structure, the displacement sensor records the stroke, so that the slider will not be pressurized until it reaches the pressurization setting position of the main cylinder, thereby not causing damage to the mold. The maximum pause time is set in the equipment. If the complete blanking action is not completed within 5 seconds and the time exceeds 5 seconds, an alarm will be given.

[0051] In use, the following movements are included:

[0052] 1. Initial state

[0053] The slider is at the highest point, and the balancing cylinder piston is at the top under the action of the high-pressure oil below;

[0054] 2. Downward contact

[0055] Valves 21, 11, 24, and 26 are opened, valve 22 is switched to the left, and the others are closed. At this time, the upper cavity of the fast-forward cylinder quickly enters oil and the lower cavity exits oil. The slider moves downward quickly until the piston of the balancing cylinder contacts the piston of the fast-forward cylinder.

[0056] 3. Contact Downstream

[0057] During the contact downward process, the pressure overflows from the No. 2 low-pressure relief valve 16 under the action of the fast-forward cylinder. The upward force generated by the overflow process of the relief valve is basically consistent with the deadweight of the slider.

[0058] 4. Downward deceleration detection process

[0059] Continue to descend to the detection end, at this time valve 23 is opened, the oil pressure in the upper cavity is reduced, the pressure reduction leads to a decrease in the downward speed, and the detection downward is turned on, and the downward movement continues. The setting value of this low pressure must ensure that no damage is caused to the waste and the mold;

[0060] 4.1 If there is waste in the equipment, the downward force on the slider under the existing low pressure state is not enough to overcome the strength of the waste and continue to move downward and stop. The slider does not pressurize until it reaches the set position of the main cylinder, so as not to cause damage to the mold. The longest pause time is set in the equipment. If the foreign matter causes the equipment to stop for 5 seconds, the equipment will not complete the complete blanking process and alarm that there is a foreign matter.

[0061] 4.2 If there is no waste inside the equipment, the slider can continue to move downward and reach the main cylinder pressurization setting position. The main cylinder pressurization completes the complete blanking process. The main cylinder pressurization process is not described in detail here;

[0062] 5. Slider up

[0063] Valve 22 switches to the right, valves 23 and 26 are closed, and valves 5 and 24 are opened. At this time, oil is simultaneously supplied to the lower cavity of the fast-forward cylinder and the lower cavity of the balance cylinder, and the lifting slide moves upward;

[0064] 6. Reset

[0065] The slider moves up to the set top dead point, and the balance cylinder moves up to the mechanical top dead point;

[0066] This reciprocating process is used to detect foreign objects.

[0067] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A downward punching hydraulic foreign body detection device with a balancing cylinder, characterized in that: It comprises a hydraulic system unit, a balancing cylinder (1), a fast-forward cylinder (2) and a master cylinder (3); The balancing cylinder (1) comprises an annular oil cylinder (101) and a balancing cylinder piston (102) arranged in the annular oil cylinder (101); The fast-forward cylinder (2) comprises a fast-forward oil cylinder (201) and a fast-forward cylinder piston (202) arranged in the fast-forward oil cylinder (201); a T-shaped structure (4) is arranged on the top of the fast-forward oil cylinder piston (202); an annular oil cylinder (101) is arranged on the top of the fast-forward oil cylinder (201); the two are rigidly connected; during the downward movement, the T-shaped structure (4) contacts the balance cylinder piston (102); and the lower end of the fast-forward cylinder piston (202) is rigidly connected to the upper slider; The master cylinder (3) comprises a master oil cylinder (301) and a master cylinder piston (302) arranged in the master oil cylinder (301); the master cylinder piston (302) is rigidly connected to the upper slider; the bottom of the master cylinder piston (302) faces the position of the lower table (5) where the product is placed; The hydraulic system unit is respectively connected to the two groups of the balance cylinder (1) and the fast-forward cylinder (2) on the left and right sides, and the hydraulic system unit comprises a cartridge valve (11) and an A-way end, a B-way end and a C-way end connected to the cartridge valve (11); The oil circuit at the A-way end is provided with a No. 1 low-pressure relief valve (12) and an upper cavity high-pressure safety valve (13) connected to the upper cavity of the fast-forward cylinder (2); The oil circuit at the B circuit end is provided with a lower cavity high pressure safety valve (15) connected to the lower cavity of the fast forward cylinder (2); The oil circuit at the C-circuit end is provided with a No. 2 low-pressure relief valve (16) and a balancing cylinder high-pressure safety valve (17) connected to the lower end of the annular oil cylinder (101) of the balancing cylinder (1); A balancing valve (14) is also provided on the oil circuit between the A-circuit end and the B-circuit end; A proportional flow valve (22) is provided on the oil circuit at the oil outlet end of the cartridge valve (11); the rest of the oil circuit is a directional control valve and a stop valve; Also included is an alarm device, which is connected to a displacement sensor and a time relay of the upper slider; The setting time of the time relay is 5s.

2. The downward punching hydraulic foreign body detection device with a balancing cylinder according to claim 1, characterized in that: The fast-forward cylinder (2) moves downward or upward to drive the upper slider to move up and down.

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