CN112046073B - Overload pump - Google Patents
Overload pump Download PDFInfo
- Publication number
- CN112046073B CN112046073B CN202010863586.XA CN202010863586A CN112046073B CN 112046073 B CN112046073 B CN 112046073B CN 202010863586 A CN202010863586 A CN 202010863586A CN 112046073 B CN112046073 B CN 112046073B
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- Prior art keywords
- valve
- pressure
- air
- spring
- pressure protection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
- B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices
- B30B15/284—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices releasing fluid from a fluid chamber subjected to overload pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Safety Valves (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The invention discloses an overload pump, which comprises a pressure protection valve, wherein the pressure protection valve is controlled by oil pressure output by the pressure protection pump, the magnitude of the oil pressure is controlled by an air valve, the pressure protection pump generates oil pressure along with the air valve after vacuumizing, the oil pressure is greater than the elastic force of a first spring of the pressure protection valve and keeps the pressure not to be released, the oil pressure is greater than the second spring force of the pressure protection valve to generate pressure release, and a motion limiting switch is closed. The first pressure cavity formed by spring force generates pre-pressing pressure to avoid the technical defect that the pressure protection is lacked in the starting process of the punching machine, and the second pressure cavity is used for pushing the limit switch to close the punching machine to protect the safety of equipment, wherein the pressure of the punching machine is greater than the spring force of the pressure protection valve after the pressure of the punching machine exceeds a designed value.
Description
Technical Field
The invention relates to the technical field of pressure pumps, in particular to an overload pump.
Background
At present, in the use process of a punch press, due to the fact that a certain difference exists between the punching force of the punch press and the punching force capable of bearing a punching grinding tool used by the punch press, the punching force of the punch press is often larger than the pressure capable of bearing the grinding tool, and the technical defects that the grinding tool or a base of the punch press is cracked too early and the like can be caused by the overload punching force of the grinding tool. It mostly adopts the pressure valve of spring structure to realize overload protection in current punch press protection, its pressure value of this kind of pressure valve structure mainly relies on adjusting spring's elasticity to realize, the pressure protection device of this spring direct response leads to the spring fatigue very easily and technical fault such as fracture appears owing to it directly receives huge punching pressure, the pressure pump protection pump of some current oil pressure formulas lacks prepressing pressure in addition and often leads to need to move after the punch press start can reach pressure protection after a period, also be exactly and lack the protection to the punch press at the heat engine in-process.
How to improve the service life of the overload protection device and realize the pre-pressing pressure is always the object of research by the technicians in the field.
Disclosure of Invention
The overload pump provided by the invention has the advantages of simple structure, long service life and direct pre-pressing pressure protection.
The utility model provides an overload pump, is controlled by the pressure protection valve of punch press including the limit switch of control punch press, limit switch, and the pressure protection valve is controlled by the oil pressure of pressure protection pump output, and oil pressure's size is controlled by the pneumatic valve subassembly, the pressure protection pump along with pneumatic valve subassembly evacuation after production oil pressure, oil pressure is greater than the first spring force of pressure protection valve and keeps pressure not produce the pressure release, first spring force also is pre-compaction spring force, oil pressure is greater than the second spring force production pressure release of pressure protection valve, closes limit switch, the second spring force also is pressure spring's elasticity. The pressure protection pump comprises a pump body, one end of the pump body is hermetically connected with a valve rod through the inner side of a sealing plug, the valve rod is controlled by a gas valve assembly, the end part of the valve rod in the pump body is connected with a movable spring seat, the movable spring seat is connected with one end of a first reset spring, the other end of the first reset spring is connected with a fixed spring seat internally provided with a through hole, the outer side of the fixed spring seat is attached and connected with a first piston in the pressure protection valve, the periphery of the first piston is provided with a pressure protection valve movable end cover, the outer side of the pressure protection valve movable end cover is provided with a groove, and the groove is attached and connected with a convex ring on the outer end face of the pump body to form a first pressure cavity; and the end surface of the first piston, the fixed spring seat, the cavity in the pump body, the one-way valve, the sealing plug and the exhaust valve jointly form a second pressure cavity. And a pre-pressing spring is arranged between the first piston and the movable end cover of the pressure protection valve.
The pressure protection valve comprises a valve body, one end of the valve body is connected with an adjusting nut, the adjusting nut is connected with one end of a pressure spring in a matching mode, the other end of the pressure spring is connected with a movable end cover of the pressure protection valve, a linkage plate is installed on the movable end cover of the pressure protection valve, and the end portion of the linkage plate is provided with a screw rod for controlling a limit switch.
The pressure protection valve movable end cover is internally provided with a blind hole, the bottom of the blind hole is connected with a pre-pressing spring, and the outer end of the blind hole is connected with a first piston.
The air valve assembly comprises an air cylinder, a left air cylinder and a right air cylinder are respectively arranged in the air cylinder, an air cylinder piston arranged on the valve rod is arranged in the right air cylinder, air cylinder spring seats connected with air cylinder springs are respectively arranged on the outer sides of the air cylinder piston, and an annular bulge integrated with the valve rod is arranged between the air cylinder spring seats and the air cylinder piston; a switching valve is arranged in the left air cylinder and comprises a switching valve body, the switching valve body is connected with the left air cylinder, and the outer wall of the switching valve body is matched with the left air cylinder to form a first air chamber connected with an air inlet; a valve core is arranged in the switching valve body, the valve core comprises a front ring body and a rear ring body, the front ring body is connected with one end of the air guide seat in a matched mode, the outer wall of the front ring body and the outer wall of the air guide seat in a matched mode are matched with the switching valve body to form a second air chamber, the inner wall of the air guide seat is matched with the front ring body and the rear ring body to form a third air chamber, and the third air chamber is communicated with the air outlet chamber through an air outlet hole in the valve core; the end surface of the rear ring body is matched with the air guide seat to form a fourth air chamber; the outer end surface of the air guide seat is matched with the right air cylinder to form a fifth air chamber, and the fifth air chamber is communicated with the first air chamber; the fifth air chamber is communicated with the fourth air chamber through a concave ring positioned on the valve rod; and a spacing ring is arranged between the fifth air chamber and the valve rod, and an air passing hole is formed in the spacing ring.
The exhaust valve comprises an exhaust screw, the exhaust screw is connected with the mutually communicated transverse pipes in a matching way, and the exhaust pipe; a sealing ball is arranged in the transverse pipe.
And an air cylinder spring is arranged between the air cylinder spring seat and the pump body.
From the above embodiments, it is apparent that the present invention has the following advantages:
1. the first pressure cavity formed by spring force generates pre-pressing pressure to avoid the technical defect that the pressure of the punch lacks pressure protection in the starting process, and the second pressure cavity is formed by pushing a limit switch to close the punch to protect equipment safety, wherein the pressure of the punch exceeds the designed value and is greater than the spring force of a pressure protection valve.
2. The air valve assembly structure drives the valve rod back and forth by using air pressure through the switching valve to perform a pressurization effect on the pressure protection pump until the pressure reached by the pressure protection pump is balanced with the pressure of the punch press to realize the technical purpose of pressure protection.
3. The exhaust valve structure controls the pressure protection pump to exhaust in vacuum, and the exhaust pipe is tightly pressed and sealed by the exhaust screw through the rolling of the sealing ball in the transverse pipe, so that the structure is safe and reliable.
Drawings
FIG. 1 is a schematic view of an overload pump according to the present invention;
FIG. 2 is a schematic view of the structure of the exhaust valve of the present invention;
FIG. 3 is a schematic diagram of a valve assembly according to the present invention.
Detailed Description
An overload pump as shown in fig. 1-3, an overload pump, includes a limit switch 24 for controlling a punch, the limit switch is controlled by a pressure protection valve 7 of the punch, the pressure protection valve 7 is controlled by an oil pressure output by the pressure protection pump, the oil pressure is controlled by an air valve assembly 15, the pressure protection pump generates oil pressure along with the air valve assembly after vacuuming, the oil pressure is greater than a first spring force of the pressure protection valve and keeps the pressure not to be released, the oil pressure is greater than a second spring force of the pressure protection valve to generate release pressure, and the limit switch 24 is closed.
The pressure protection pump with the optimized structure comprises a pump body 23, one end of the pump body 23 is connected with a valve rod 2 through the inner side of a sealing plug 4 in a sealing mode, the valve rod 2 is controlled by an air valve assembly 15, the end portion of the valve rod 2 in the pump body 23 is connected with a movable spring seat 25, the movable spring seat 25 is connected with one end of a first reset spring 27, the other end of the first reset spring 27 is connected with a fixed spring seat 13 with a through hole formed therein, the outer side of the fixed spring seat 13 is attached to a first piston 26 in the pressure protection valve, a movable end cover 11 of the pressure protection valve is arranged on the periphery of the first piston 26, and a groove is arranged on the outer side of the movable end cover 11 of the pressure protection valve and attached to a convex ring on the outer end face of the pump body 23 to form a first pressure cavity 32 to generate pre-pressing pressure. A pre-pressing spring 6 is arranged between the first piston 26 and the movable end cover 11 of the pressure protection valve. The pressure protection valve movable end cover 11 is internally provided with a blind hole, the bottom of the blind hole is connected with the pre-pressing spring 6, and the outer end of the blind hole is connected with the first piston 26, so that the pre-pressing spring 6 can be conveniently installed and the pre-pressing force of the first pressure cavity 32 can be conveniently set.
The pressure protection valve 7 comprises a valve body, one end of the valve body is connected with an adjusting nut 10, the adjusting nut is connected with one end of a pressure spring 9 in a matching mode, the other end of the pressure spring 9 is connected with a movable end cover 11 of the pressure protection valve, a linkage plate 5 is installed on the movable end cover 11 of the pressure protection valve, a screw rod for controlling a limit switch 24 is arranged at the end portion of the linkage plate 5, and a set pressure protection value is formed through the elastic force of the pressure spring 9.
The air valve assembly 15 with the optimized structure comprises an air cylinder, a left air cylinder and a right air cylinder 62 are respectively arranged in the air cylinder, an air cylinder piston 1 installed on a valve rod 2 is arranged in the right air cylinder, an air cylinder spring seat 40 connected with an air cylinder spring is respectively arranged on the outer side of the air cylinder piston 1, and an annular bulge 41 integrated with the valve rod 2 is arranged between the air cylinder spring seat 40 and the air cylinder piston 1. A cylinder spring 3 is provided between the cylinder spring seat 40 and the pump body 23.
A switching valve is arranged in the left air cylinder and comprises a switching valve body 19, the switching valve body 19 is connected with the left air cylinder, and the outer wall of the switching valve body 19 is matched with the left air cylinder to form a first air chamber 21 connected with an air inlet 42. A valve core is arranged in the valve body of the switching valve, the valve core comprises a front ring body and a rear ring body, the front ring body 43 is connected with one end of an air guide seat 44 in a matched mode, the outer wall of the front ring body 43 is matched with the outer wall of the air guide seat 44 to form a second air chamber 45, the inner wall of the air guide seat 44 is matched with the front ring body 43 and the rear ring body 46 to form a third air chamber 47, and the third air chamber 47 is communicated with an air outlet chamber 49 through an air outlet hole 48 in the valve core. The end surface of the rear ring 46 cooperates with the air guide seat 44 to form a fourth air chamber 50. The outer end surface of the air guide seat 44 is matched with the right air cylinder 62 to form a fifth air chamber 51, and the fifth air chamber 51 is communicated with the first air chamber 21. The fifth air chamber 51 communicates with the fourth air chamber 50 through a recessed ring 52 provided on the valve stem 2. A spacing ring 53 is arranged between the fifth air chamber and the valve rod 2, and an air passing hole is arranged on the spacing ring 53.
The exhaust valve 14 preferably comprises an exhaust screw 28, a transverse pipe 31 and an exhaust pipe 30, wherein the transverse pipe 31 is communicated with the exhaust screw 28 in a matching mode, and a sealing ball 29 is arranged in the transverse pipe 31.
The end face of the first piston 26, the fixed spring seat 13, the cavity in the pump body 23, the one-way valve 16, the sealing plug 4 and the exhaust valve 14 form a second pressure cavity together. The one-way valve 16 is communicated with the oil tank, and a valve rod is driven back and forth by air pressure through a switching valve along with the structure of the air valve assembly, so that the pressure protection pump is pressurized.
The specific working process of the invention is as follows: the air inlet 42 is filled with air, the air pushes the front ring body 43 to move forwards through the first air chamber 21, the air reaches the second air chamber 45, the second air chamber 45 is communicated with the right air cylinder 62 to push the air cylinder piston 1 to move, the valve rod 2 is further driven to move forwards, and the air in the second pressure cavity is discharged through the exhaust valve 14 by the valve rod 2. In the process, the valve rod 2 moves forwards to the concave ring 52 to be communicated with the air passing holes on the spacing ring 53, namely the fifth air chamber 21, the first air chamber 21 and the fourth air chamber 50 are communicated with each other, at the moment, the gas in the fourth air chamber 50 pushes the rear ring body 46 to move backwards, the second air chamber 45 is communicated with the third air chamber 47, the gas in the right air cylinder 62 passes through the second air chamber 45 and passes through the third air chamber 47 to reach the air outlet chamber 49 to be discharged, meanwhile, the cylinder piston 1 drives the valve rod 2 to move backwards under the action of the cylinder spring 3, vacuum negative pressure is formed in the second pressure chamber, pressure oil is sucked into the second pressure chamber through the one-way valve 16 to reciprocate until the pressure of the pressure protection valve is balanced, and only when the air pressure of the punch press is greater than the set spring force of the pressure protection valve, the technical purpose that the linkage plate 5 is pushed to close the limit switch 24 under the overload state is achieved.
Claims (5)
1. The utility model provides an overload pump, includes limit switch (24) of control punch press, and limit switch is controlled by pressure protection valve (7) of punch press, and pressure protection valve (7) are controlled by the oil pressure of pressure protection pump output, and the size of oil pressure is controlled by air valve assembly (15), its characterized in that: the pressure protection pump generates oil pressure along with the air valve assembly after being vacuumized, the oil pressure is greater than the first spring force of the pressure protection valve and keeps the pressure not to be released, the oil pressure is greater than the second spring force of the pressure protection valve to be released, and the limit switch (24) is closed; the pressure protection pump comprises a pump body (23), one end of the pump body (23) is connected with a valve rod (2) in a sealing mode through the inner side of a sealing plug (4), the valve rod (2) is controlled by an air valve assembly (15), the end portion, in the pump body (23), of the valve rod (2) is connected with a movable spring seat (25), the movable spring seat (25) is connected with one end of a first reset spring (27), the other end of the first reset spring (27) is connected with a fixed spring seat (13) with a through hole formed in the other end of the first reset spring, the outer side of the fixed spring seat (13) is attached to and connected with a first piston (26) in the pressure protection valve, a movable end cover (11) of the pressure protection valve is arranged on the periphery of the first piston (26), a groove is arranged on the outer side of the movable end cover (11) of the pressure protection valve and is attached to and connected with a convex ring on the outer end face of the pump body (23) to form a first pressure cavity (32); the end face of the first piston (26), the fixed spring seat (13), a cavity in the pump body (23), the one-way valve (16), the sealing plug (4) and the exhaust valve (14) form a second pressure cavity together; a pre-pressing spring (6) is arranged between the first piston (26) and the movable end cover (11) of the pressure protection valve; the pressure protection valve movable end cover (11) inside be equipped with the blind hole, pre-compaction spring (6) is connected to the blind hole bottom, first piston (26) is connected to the blind hole outer end.
2. An overload pump as claimed in claim 1, wherein: the pressure protection valve (7) comprises a valve body, one end of the valve body is connected with an adjusting nut (10), the adjusting nut is matched with and connected with one end of a pressure spring (9), the other end of the pressure spring (9) is connected with a movable end cover (11) of the pressure protection valve, a linkage plate (5) is installed on the movable end cover (11) of the pressure protection valve, and a screw rod for controlling a limit switch (24) is arranged at the end part of the linkage plate (5).
3. An overload pump as claimed in claim 1, wherein: the air valve assembly (15) comprises an air cylinder, a left air cylinder and a right air cylinder (62) are respectively arranged in the air cylinder, an air cylinder piston (1) arranged on the valve rod (2) is arranged in the right air cylinder, an air cylinder spring seat (40) connected with an air cylinder spring (3) is respectively arranged on the outer side of the air cylinder piston (1), and an annular bulge (41) integrated with the valve rod (2) is arranged between the air cylinder spring seat (40) and the air cylinder piston (1); a switching valve is arranged in the left air cylinder and comprises a switching valve body (19), the switching valve body (19) is connected with the left air cylinder, and the outer wall of the switching valve body (19) is matched with the left air cylinder to form a first air chamber (21) connected with an air inlet (42); a valve core is arranged in the valve body of the switching valve, the valve core comprises a front ring body and a rear ring body, the front ring body (43) is connected with one end of an air guide seat (44) in a matched mode, the outer wall of the front ring body (43) is matched with the outer wall of the air guide seat (44) to form a second air chamber (45), the inner wall of the air guide seat (44) is matched with the front ring body (43) and the rear ring body (46) to form a third air chamber (47), and the third air chamber (47) is communicated with an air outlet chamber (49) through an air outlet hole (48) in the valve core; the end face of the rear ring body (46) is matched with the air guide seat (44) to form a fourth air chamber (50); the outer end face of the air guide seat (44) is matched with the right air cylinder (62) to form a fifth air chamber (51), and the fifth air chamber (51) is communicated with the first air chamber (21); the fifth air chamber (51) is communicated with the fourth air chamber (50) through a concave ring (52) positioned on the valve rod (2); and a spacing ring (53) is arranged between the fifth air chamber and the valve rod (2), and an air passing hole is formed in the spacing ring (53).
4. An overload pump as claimed in claim 1, wherein: the exhaust valve (14) comprises an exhaust screw (28), the exhaust screw (28) is connected with a cross pipe (31) and an exhaust pipe (30) in a matched manner, wherein the cross pipes are communicated with each other; a sealing ball (29) is arranged in the transverse pipe (31).
5. An overload pump according to claim 3 wherein: and a cylinder spring (3) is arranged between the cylinder spring seat (40) and the pump body (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863586.XA CN112046073B (en) | 2020-08-25 | 2020-08-25 | Overload pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010863586.XA CN112046073B (en) | 2020-08-25 | 2020-08-25 | Overload pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112046073A CN112046073A (en) | 2020-12-08 |
| CN112046073B true CN112046073B (en) | 2022-09-27 |
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ID=73599919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010863586.XA Active CN112046073B (en) | 2020-08-25 | 2020-08-25 | Overload pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN112046073B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM281726U (en) * | 2005-06-24 | 2005-12-01 | Hung-Ming Hung | Over-loading protection device |
| CN201145074Y (en) * | 2007-12-17 | 2008-11-05 | 洪宏明 | Pressure release valve with pressure inspection |
| CN107756868B (en) * | 2017-11-18 | 2024-01-12 | 浙江灿根智能科技股份有限公司 | Overload protection device for combined pump valve for punch press |
| CN209477148U (en) * | 2018-12-04 | 2019-10-11 | 嵊州市元昊机械有限公司 | A kind of discharge mechanism for overloading protector |
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2020
- 2020-08-25 CN CN202010863586.XA patent/CN112046073B/en active Active
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| Publication number | Publication date |
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| CN112046073A (en) | 2020-12-08 |
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