CN109759548B - Sand shooting valve for molding machine - Google Patents
Sand shooting valve for molding machine Download PDFInfo
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- CN109759548B CN109759548B CN201910240441.1A CN201910240441A CN109759548B CN 109759548 B CN109759548 B CN 109759548B CN 201910240441 A CN201910240441 A CN 201910240441A CN 109759548 B CN109759548 B CN 109759548B
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Abstract
The invention discloses a sand injection valve for a molding machine, and belongs to the field of casting machinery. The valve comprises a valve body, wherein the valve body is a carrier with the following structure: the sand injection valve comprises a disc type sealing plug sliding cavity, a disc type sealing plug, a valve closing pressure chamber, a valve opening and closing control air port, a ring chamber, an air outlet channel, a sand injection valve air outlet, a sealing plug sealing structure and a sand injection valve air inlet; the inner cavity upper portion at the valve body is equipped with disk sealing plug sliding chamber, disk sealing plug sliding fit in disk sealing plug sliding chamber, and valve switching control gas port is located the top of valve closed pressure chamber, is equipped with the outlet duct in disk sealing plug sliding chamber's below, forms the loop room between the outer wall of outlet duct and the inner chamber wall of valve body, and the loop room is equipped with the sand shooting valve air inlet that is used for being connected with the air supply, is equipped with sealing plug seal structure between loop room and the disk sealing plug bottom to when making disk sealing plug slide to disk sealing plug sliding chamber bottom, disk sealing plug bottom will loop room upper port seal. The device has the characteristics of simple structure, convenient operation, safety, reliability and the like.
Description
Technical Field
The present invention relates to the field of foundry machinery.
Background
In the foundry industry, a vertical molding machine or a slip flask molding machine needs to blow high-pressure gas through a sand injection valve to a sand injection cylinder containing sand before molding, and the high-pressure gas drives the sand in the sand injection cylinder to blow and inject the sand to a sand box, and then extrusion molding is started. The sand shooting valve is generally a diaphragm valve.
However, in practical use, the diaphragm valve has the following problems that are difficult to solve.
(1) Larger valve body liners and larger diaphragm fabrication are difficult to achieve due to the limitations of the valve body liner process and the diaphragm fabrication process, with typical diaphragm valve paths typically below 76 mm. Since the size of the through-gas flow is directly related to the valve diameter, if the ventilation flow is to be increased, only a plurality of diaphragm valves can be used, which increases the complexity of the structure and assembly.
(2) The diaphragm of the diaphragm valve is extremely easy to generate fatigue damage under the action of dynamic stress and strain for a long time, so that failure modes such as diaphragm cracks, crazes and the like appear. If the diaphragm is broken, the whole diaphragm valve is generally replaced, so that the pipeline needs to be detached first, and time and labor are wasted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sand injection valve for a molding machine, which has the characteristics of simple structure, convenient operation, safety, reliability and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
the sand shooting valve for the molding machine comprises a valve body, wherein the valve body is a carrier with the following structure: the sand injection valve comprises a disc type sealing plug sliding cavity, a disc type sealing plug, a valve closing pressure chamber, a valve opening and closing control air port, a ring chamber, an air outlet channel, a sand injection valve air outlet, a sealing plug sealing structure and a sand injection valve air inlet; the upper part of the inner cavity of the valve body is provided with a disc type sealing plug sliding cavity, the disc type sealing plug is slidingly matched in the disc type sealing plug sliding cavity, the sealing plug sliding cavity at the upper part of the disc type sealing plug forms a valve closing pressure chamber, a valve opening and closing control air port is positioned above the valve closing pressure chamber, an air outlet pipe is arranged below the disc type sealing plug sliding cavity, a gap is arranged between the outer wall of the air outlet pipe and the inner cavity wall of the valve body, the bottom of the outer wall of the air outlet pipe is in sealing connection with the inner cavity wall of the valve body, so that a ring chamber is formed between the outer wall of the air outlet pipe and the inner cavity wall of the valve body, the ring chamber is provided with a sand injection valve air inlet used for being connected with an air source Q, so that the ring chamber forms an air inlet channel, when the disc type sealing plug slides to the bottom of the disc type sealing plug sliding cavity, the upper port of the ring chamber is closed, the ring chamber forms a valve opening pressure chamber, the inner cavity of the air outlet pipe forms an air outlet channel, and the bottom opening end of the air outlet pipe is a sand injection valve air outlet.
The invention is further improved in that:
the sand shooting valve further comprises a pressure relief structure, wherein the pressure relief structure comprises an air outlet channel exhaust port communicated with the air outlet channel and a pressure relief control executing element for controlling the on-off of the air outlet channel and the air outlet channel exhaust port.
The pressure release structure comprises a piston sliding cavity, a double-acting piston actuating mechanism and an exhaust piston, wherein an exhaust port of an exhaust channel is arranged on the cavity wall in the middle of the piston sliding cavity and is used for being communicated with the atmosphere, the inner end of the piston sliding cavity is communicated with the exhaust channel, the double-acting piston actuating mechanism is arranged at the outer end of the piston sliding cavity, the end part of a piston rod of the double-acting piston actuating mechanism is connected with the exhaust piston, and the exhaust piston slides to the other side of the exhaust port of the exhaust channel from one side of the exhaust port of the exhaust channel in the piston sliding cavity under the drive of the double-acting piston actuating mechanism, so that the communication and disconnection of the exhaust channel and the exhaust port of the exhaust channel are controlled, and the double-acting piston actuating mechanism and the exhaust piston connected with the double-acting piston actuating mechanism form a pressure release control actuating element.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
The invention designs and makes according to the working characteristics that the valve is fully opened when the sand injection valve injects sand, and the rear end of the valve has no (relative) air pressure after sand injection is stopped, and the device adopts the following structure: the lower part of the disc type sealing plug sliding cavity is provided with an air outlet pipe, a gap is arranged between the outer wall of the air outlet pipe and the inner cavity wall of the valve body, the bottom of the outer wall of the air outlet pipe is in sealing connection with the inner cavity wall of the valve body, a ring chamber is formed between the outer wall of the air outlet pipe and the inner cavity wall of the valve body, the ring chamber is provided with an air inlet of a sand shooting valve used for being connected with an air source Q, so that the ring chamber forms an air inlet channel, a sealing plug sealing structure is arranged between the ring chamber and the bottom of the disc type sealing plug, when the disc type sealing plug slides to the bottom of the disc type sealing plug sliding cavity, the bottom of the disc type sealing plug seals an upper port of the ring chamber, and the ring chamber forms a valve opening pressure chamber. The pressure of the valve is acted on the upper surface of the disc type sealing plug in the valve closing pressure chamber, the pressure of the valve opening pressure chamber is acted on the lower surface of the disc type sealing plug corresponding to the valve opening pressure chamber (annular chamber), the stress area of the upper surface of the disc type sealing plug is far larger than the stress area below the disc type sealing plug, the air source for controlling the valve to act and the air source for sand injection adopt the air source with the same pressure according to the air pressure formula F=p×S, the valve is also easy to quickly close, after the valve closing pressure chamber is depressurized, the disc type sealing plug can be jacked up upwards by the air source pressure filled in the annular chamber due to the fact that the valve opening pressure chamber is provided with the sand injection valve air inlet for connecting with the air source Q, so that the air enters the air outlet channel from the upper part of the valve opening pressure chamber (air inlet channel) and is discharged from the air outlet of the sand injection valve, and the valve is in an open state. The air source for sand injection is adopted to finish the opening of the valve, so that the air inlet channel is used as a valve opening pressure chamber at the same time, thereby omitting the valve opening pressure chamber of the double-acting regulating valve in the prior art, and meanwhile, the sealing plug sealing structure is arranged between the annular chamber and the bottom of the disc type sealing plug, so that the disc type sealing plug is used as a piston of the double-acting regulating valve in the prior art, and is used as a valve core of the double-acting regulating valve in the prior art, thereby omitting a valve rod and the valve core which are connected with the piston in the double-acting regulating valve in the prior art, and having simple structure, convenient operation and safe and reliable use.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic diagram of a structure of a sand shooting system for a molding machine, which is formed by applying the device to the sand shooting system for the molding machine.
In the drawings: 1. a disc-type sealing plug; 2. the valve closes the pressure chamber; 3. a valve opening/closing control gas port; 4. an air outlet pipe; 5. a valve body; 6. a ring chamber; 7. an air outlet channel; 8. a sand injection valve air outlet; 9. an air inlet of the sand shooting valve; 10. an air outlet of the air outlet channel; 11. a sand shooting barrel; 12. a piston sliding chamber; 13. a double-acting piston type actuating mechanism; 14. and (3) exhausting the piston.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific embodiments.
The device is applied to a sand shooting system for a molding machine to form the sand shooting system for the molding machine, and when sand shooting work is carried out, a sand shooting outlet of a sand shooting cylinder in the sand shooting system is communicated with a sand box.
As can be seen from the embodiments shown in fig. 1 and 2, the present embodiment includes a sand injection valve and a sand injection valve control device, the sand injection valve includes a valve body 5, and the valve body 5 is a carrier with the following structure: the sand injection valve comprises a disc type sealing plug sliding cavity, a disc type sealing plug 1 (composed of polyurethane coated on the surface of a wear-resistant aluminum cylinder), a valve closing pressure chamber 2, a valve opening and closing control air port 3, a ring chamber 6, an air outlet channel 7, a sand injection valve air outlet 8, a sealing plug sealing structure, a sand injection valve air inlet 9 and a pressure relief structure; a disc-type sealing plug sliding cavity is arranged at the upper part of an inner cavity of the valve body 5, the disc-type sealing plug 1 is slidably matched in the disc-type sealing plug sliding cavity, the sealing plug sliding cavity at the upper part of the disc-type sealing plug 1 forms a valve closing pressure chamber 2, a valve opening and closing control air port 3 is arranged above the valve closing pressure chamber, an air outlet pipe 4 is arranged below the disc-type sealing plug sliding cavity, a gap is arranged between the outer wall of the air outlet pipe 4 and the inner cavity wall of the valve body 5, the bottom of the outer wall of the air outlet pipe 4 is in sealing connection with the inner cavity wall of the valve body 5, a ring chamber 6 is formed between the outer wall of the air outlet pipe 4 and the inner cavity wall of the valve body 5, a sand injection valve air inlet 9 used for being connected with an air source Q is arranged in the ring chamber 6, so that the ring chamber 6 forms an air inlet channel, a sealing plug sealing structure is arranged between the ring chamber 6 and the bottom of the disc-type sealing plug 1 (when the bottom of the disc-type sealing plug 1 is in sealing connection with the ring chamber 6 through a sealing pad), the upper port of the ring chamber 6 is sealed when the disc-type sealing plug 1 slides to the bottom of the disc-type sealing plug sliding cavity, so that the ring chamber 6 forms a valve opening pressure chamber, the inner cavity 7 is formed, the inner opening of the air outlet 4 is formed by the valve, the outer opening is formed, the outer opening of the air outlet is used for the ring 1, the bottom is connected with an air outlet opening, and an air outlet 10 is used for controlling the vent 10, and an outlet 10, which is connected and an outlet 10; the sand injection valve control device comprises an electromagnetic valve controller, a valve opening and closing control air path, a sand injection valve control air path and a pressure relief control device for controlling the action of a pressure relief control execution element, wherein the valve opening and closing control air path comprises an air inlet pipeline and an air exhaust pipeline, the air inlet pipeline sequentially comprises an air source Q, a two-position two-way electromagnetic valve F1 and a valve opening and closing control air port 3 of the sand injection valve according to the air flow direction, and the air exhaust pipeline sequentially comprises the valve opening and closing control air port 3 of the sand injection valve, the two-position two-way electromagnetic valve F2 and the atmosphere according to the air flow direction; the sand shooting valve control air pipeline sequentially comprises an air source Q, a sand shooting valve air inlet 9, a sand shooting valve air outlet 8 and a sand shooting barrel 11 according to the air flow direction.
The pressure release structure comprises a piston sliding cavity 12, a double-acting piston actuating mechanism 13 and an exhaust piston 14, wherein the exhaust port 10 of the exhaust channel is arranged on the cavity wall in the middle of the piston sliding cavity 12 and is used for being communicated with the atmosphere, the inner end of the piston sliding cavity 12 is communicated with the exhaust channel 7, the double-acting piston actuating mechanism 13 is arranged at the outer end of the piston sliding cavity 12, the end part of a piston rod of the double-acting piston actuating mechanism 13 is connected with the exhaust piston 14, the exhaust piston slides to the other side of the exhaust port 10 of the exhaust channel from one side of the exhaust port 10 of the exhaust channel under the driving of the double-acting piston actuating mechanism 13 in the piston sliding cavity 12, so that the communication and disconnection of the exhaust channel 7 and the exhaust port 10 of the double-acting piston actuating mechanism 13 and the exhaust piston 14 connected with the piston actuating mechanism form a pressure release control actuating element, and the pressure release control device is a pressure release control air path, and the pressure release control air path is used for controlling the communication state of an air source Q and two air ports of the double-acting piston actuating mechanism 13 through a two-position five-way valve F3, so that the double-acting piston actuating mechanism 13 acts.
In the sand shooting valve control air pipeline, an air bag C is arranged between an air source Q and an air inlet 9 of the sand shooting valve.
The two air outlets of the two-position five-way valve F3 are respectively communicated with the two air outlets of the double-acting piston type actuating mechanism 13 through a one-way throttle valve F4.
Working principle and process:
the electromagnetic valve controller in the device belongs to program (time sequence) control, and is used for controlling the action of each electromagnetic valve from the prior art, and can be completed through single chip microcomputer programming or system configuration by a PLC controller.
(1) In an initial state, the sand injection valve is in a closed and maintained state by a sand injection system for the sand injection front molding machine: in the sand injection valve control device, a two-position two-way electromagnetic valve F1 is in an open state, a two-position two-way electromagnetic valve F2 is in a closed state, a five-way valve F3 controls a double-acting piston type actuating mechanism 13 to act, so that an air outlet channel 7 and an air outlet channel air outlet 10 are in a communicating state, the relative air pressure position behind the valve is zero, at the moment, the disc type sealing plug 1 is positioned at the bottom of a sliding cavity of the disc type sealing plug, the upper port of a ring chamber 6 is closed at the bottom of the disc type sealing plug 1, a valve closing pressure chamber 2 is kept communicated with an air source Q, pressure acts on the upper surface of the disc type sealing plug 1, air pressure for opening the valve in the ring chamber 6 (valve opening pressure chamber) only acts on the lower surface of the disc type sealing plug corresponding to the valve opening pressure chamber (the ring chamber), the downward pressure on the upper surface of the disc type sealing plug is far greater than the upward pressure of the lower surface of the disc type sealing plug, the disc type sealing plug is tightly pressed on the upper port edge of the ring chamber 6, the sealing plug is closed structure seals the upper port of the ring chamber 6, sand injection gas is blocked by the disc type sealing plug, and the sand injection valve is in a closed and kept state.
(2) In the sand shooting state, the sand shooting valve is opened by the sand shooting system for the molding machine during sand shooting: in the sand injection valve control device, a two-position two-way electromagnetic valve F1 is closed, a two-position two-way electromagnetic valve F2 is opened, a five-way valve F3 controls a double-acting piston type actuating mechanism 13 to act so as to close an air outlet channel 7 and an air outlet channel air outlet 10, at the moment, the valve closing pressure chamber 2 is depressurized, a disc type sealing plug only receives upward thrust of air pressure in a valve opening pressure chamber (annular chamber), the disc type sealing plug moves upwards, and sand injection gas enters the air outlet channel 7 from the upper part of the valve opening pressure chamber (annular chamber and air inlet channel) and is discharged from an air outlet 8 of the sand injection valve, so that the valve is in an open state.
(3) After sand injection is finished, the sand injection valve is closed by the sand injection system for the molding machine after sand injection: in the sand injection valve control device, a two-position two-way electromagnetic valve F1 is opened, a two-position two-way electromagnetic valve F2 is closed, at the moment, a valve closing pressure chamber 2 is kept communicated with an air source Q, pressure acts on the upper surface of a disc type sealing plug 1, sand injection air on the lower surface of the disc type sealing plug 1 is in a flowing (pressure relief) state, the downward pressure on the upper surface of the disc type sealing plug 1 is far greater than the upward pressure on the lower surface of the disc type sealing plug, the disc type sealing plug 1 slides downwards in a sliding cavity of the disc type sealing plug, the disc type sealing plug is tightly pressed on the upper opening edge of a ring chamber 6, a sealing plug sealing structure seals the upper port of the ring chamber 6, the sand injection air is blocked by the disc type sealing plug, and the sand injection valve is in a closing and holding state; the five-way valve F3 controls the action of the double-acting piston type actuating mechanism 13, so that the air outlet channel 7 is communicated with the air outlet port 10 of the air outlet channel, and the relative air pressure position behind the valve is zero, so that the molding machine can work subsequently.
Claims (1)
1. A sand shooting valve for a molding machine, characterized in that: the valve comprises a valve body (5), wherein the valve body (5) is a carrier with the following structure: the sand injection valve comprises a disc type sealing plug sliding cavity, a disc type sealing plug (1), a valve closing pressure chamber (2), a valve opening and closing control air port (3), a ring chamber (6), an air outlet channel (7), a sand injection valve air outlet (8), a sealing plug sealing structure and a sand injection valve air inlet (9); the upper part of the inner cavity of the valve body (5) is provided with a disc-type sealing plug sliding cavity, the disc-type sealing plug (1) is slidingly matched in the disc-type sealing plug sliding cavity, the sealing plug sliding cavity at the upper part of the disc-type sealing plug (1) forms a valve closing pressure chamber (2), a valve opening and closing control air port (3) is positioned above the valve closing pressure chamber, an air outlet pipe (4) is arranged below the disc-type sealing plug sliding cavity, a gap is arranged between the outer wall of the air outlet pipe (4) and the inner cavity wall of the valve body (5), the outer wall bottom of the air outlet pipe (4) is in sealing connection with the inner cavity wall of the valve body (5), so that a ring chamber (6) is formed between the outer wall of the air outlet pipe (4) and the inner cavity wall of the valve body (5), the ring chamber (6) is provided with a sand injection valve air inlet (9) used for being connected with an air source Q, a sealing structure is arranged between the ring chamber (6) and the bottom of the disc-type sealing plug (1) so that when the disc-type sealing plug (1) slides to the inner cavity (6) to form the ring chamber (6), the ring chamber (6) forms a sealing plug opening bottom (7), the bottom opening end of the air outlet pipe (4) is provided with an air outlet (8) of a sand shooting valve;
The sand shooting valve further comprises a pressure relief structure, wherein the pressure relief structure comprises an air outlet channel exhaust port (10) communicated with the air outlet channel (7) and a pressure relief control executing element for controlling the on-off of the air outlet channel (7) and the air outlet channel exhaust port (10);
The pressure release structure comprises a piston sliding cavity (12), a double-acting piston actuating mechanism (13) and an exhaust piston (14), wherein an exhaust port (10) of an exhaust channel is arranged on the cavity wall in the middle of the piston sliding cavity (12) and is used for being communicated with the atmosphere, the inner end of the piston sliding cavity (12) is communicated with the exhaust channel (7), the double-acting piston actuating mechanism (13) is arranged at the outer end of the piston sliding cavity (12), the end part of a piston rod of the double-acting piston actuating mechanism (13) is connected with the exhaust piston (14), and the exhaust piston is driven by the double-acting piston actuating mechanism (13) to slide to the other side of the exhaust port (10) of the exhaust channel in the piston sliding cavity (12) from one side of the exhaust port (10) of the exhaust channel, so that the communication and disconnection of the exhaust channel (7) and the exhaust port (10) of the exhaust channel are controlled, and the exhaust piston (14) connected with the double-acting piston actuating mechanism (13) form the pressure release control element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240441.1A CN109759548B (en) | 2019-03-28 | 2019-03-28 | Sand shooting valve for molding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240441.1A CN109759548B (en) | 2019-03-28 | 2019-03-28 | Sand shooting valve for molding machine |
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| CN109759548A CN109759548A (en) | 2019-05-17 |
| CN109759548B true CN109759548B (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910240441.1A Active CN109759548B (en) | 2019-03-28 | 2019-03-28 | Sand shooting valve for molding machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252969A (en) * | 2019-07-24 | 2019-09-20 | 盐城市东云自动化科技有限公司 | An on-off valve for a sand casting molding machine |
| CN112091181B (en) * | 2020-09-07 | 2022-04-12 | 东风汽车股份有限公司 | Sand shooting exhaust pinch valve of core making machine |
Citations (8)
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| DE930104C (en) * | 1954-02-16 | 1955-07-11 | Fritz Hansberg | Machine for the production of foundry cores and for filling molding sand into molding boxes using compressed air |
| JPH03204137A (en) * | 1989-12-28 | 1991-09-05 | Kooyoo:Kk | Impact type molding apparatus |
| JPH10323739A (en) * | 1997-05-23 | 1998-12-08 | Aisin Takaoka Ltd | Blow head equipment |
| JP2001259793A (en) * | 2000-03-14 | 2001-09-25 | Sintokogio Ltd | Compressed air blowing equipment for green molding equipment |
| CN206351237U (en) * | 2016-11-28 | 2017-07-25 | 广东中铸机械设备有限公司 | Shooting cylinder penetrates sand gas extraction system |
| CN108339949A (en) * | 2017-05-04 | 2018-07-31 | 天津中德应用技术大学 | Penetrate sand cylinder |
| CN208086816U (en) * | 2018-04-17 | 2018-11-13 | 邹平创星环保设备有限公司 | Pneumatic dredge valve |
| CN209598149U (en) * | 2019-03-28 | 2019-11-08 | 彰武永红机械制造有限公司 | A kind of moulding machine Sand jet valve |
-
2019
- 2019-03-28 CN CN201910240441.1A patent/CN109759548B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE930104C (en) * | 1954-02-16 | 1955-07-11 | Fritz Hansberg | Machine for the production of foundry cores and for filling molding sand into molding boxes using compressed air |
| JPH03204137A (en) * | 1989-12-28 | 1991-09-05 | Kooyoo:Kk | Impact type molding apparatus |
| JPH10323739A (en) * | 1997-05-23 | 1998-12-08 | Aisin Takaoka Ltd | Blow head equipment |
| JP2001259793A (en) * | 2000-03-14 | 2001-09-25 | Sintokogio Ltd | Compressed air blowing equipment for green molding equipment |
| CN206351237U (en) * | 2016-11-28 | 2017-07-25 | 广东中铸机械设备有限公司 | Shooting cylinder penetrates sand gas extraction system |
| CN108339949A (en) * | 2017-05-04 | 2018-07-31 | 天津中德应用技术大学 | Penetrate sand cylinder |
| CN208086816U (en) * | 2018-04-17 | 2018-11-13 | 邹平创星环保设备有限公司 | Pneumatic dredge valve |
| CN209598149U (en) * | 2019-03-28 | 2019-11-08 | 彰武永红机械制造有限公司 | A kind of moulding machine Sand jet valve |
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