CN115450972B

CN115450972B - Pneumatic control system and gantry hydraulic press

Info

Publication number: CN115450972B
Application number: CN202211047339.8A
Authority: CN
Inventors: 杨永新; 谢静; 丁燕琦; 吕杰; 谢尚许; 赵元康
Original assignee: Dongfeng Liuzhou Motor Co Ltd
Current assignee: Dongfeng Liuzhou Motor Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2024-04-23
Anticipated expiration: 2042-08-29
Also published as: CN115450972A

Abstract

The invention discloses a pneumatic control system and a gantry hydraulic press, wherein the pneumatic control system comprises: the control valve is driven to move on the moving stroke of the control valve by a piston rod of the air cylinder; the switching device is used for switching one of two cavities of the air cylinder to be communicated with the air compressor, and the other cavity of the air cylinder to be communicated with the atmosphere; the blocking switch is arranged on the hydraulic pressure head; the communication pipeline comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is used for communicating one of cavities of the air cylinder with the switching device, the second pipeline is used for communicating the other cavity of the air cylinder with the blocking switch, and the third pipeline is used for communicating the blocking switch with the air exchanging device. The invention uses the foot switch to control the hydraulic press to operate, liberates the hands of a worker, and automatically resets and stops the pressure head after the workpiece is pressed, thereby having convenient operation and simple structure.

Description

Pneumatic control system and gantry hydraulic press

Technical Field

The invention relates to the technical field of gantry hydraulic presses, in particular to a pneumatic control system and a gantry hydraulic press.

Background

In the automobile manufacturing process, a large number of workpieces are required to be punched, and the gantry hydraulic press is widely applied to the press mounting process of small workpieces by virtue of small machine body and low cost.

The existing gantry hydraulic press has the problems of cost and the application of a numerical control system, the operation of the whole machine is finished manually, in the operation process, a worker places a prefabricated part on a press-mounting platform below a press head, presses down the control rod of the control valve by hand, then the press head moves downwards to finish the press-mounting of a workpiece, then pushes the control rod of the control valve upwards to enable the press head to move upwards, finally releases the control rod, stops the press head to move, removes the workpiece and finishes the press-mounting.

In the process, a worker needs to overcome the elasticity of the valve core spring in the control valve by 40-50N in the whole process, press down or push up the control rod, and switch the direction of the control rod or loosen the control rod according to the press-fit progress, so that the whole process is complex in operation, long in time consumption, and large amount of effort is needed by the worker, and the quick production of the workpiece is not facilitated.

Disclosure of Invention

The invention mainly aims to provide a pneumatic control system and a gantry hydraulic machine, and aims to solve the problems of complex operation and labor and effort of the traditional gantry hydraulic machine.

In order to achieve the above object, the present invention provides a pneumatic control system for a gantry hydraulic press including a hydraulic ram and a pilot valve, the pneumatic control system comprising:

The piston rod of the air cylinder is in transmission connection with the control valve so as to drive the control valve to move on the moving stroke of the air cylinder;

The switching device is used for switching one of two cavities of the air cylinder to be communicated with the air compressor, and the other cavity of the air cylinder to be communicated with the atmosphere so as to enable a piston rod of the air cylinder to extend or retract;

The blocking switch is arranged on the hydraulic pressure head; and

The communication pipeline comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is used for communicating one of the cavities of the air cylinder with the switching device, the second pipeline is used for communicating the other cavity of the air cylinder with the blocking switch, and the third pipeline is used for communicating the blocking switch with the air exchanging device;

When the blocking switch is closed, the second pipeline is communicated with the third pipeline, and when the blocking switch is opened, the second pipeline is disconnected from the third pipeline and is used for being communicated with the atmosphere.

Optionally, the air cylinder is arranged above the control valve, and a piston rod of the air cylinder can move up and down and is in transmission connection with a control rod of the control valve;

The cylinder is far away from the cavity of controlling the valve is the cavity, is close to the cavity of controlling the valve is the cavity down, first pipeline intercommunication the cavity down, the second pipeline intercommunication the cavity.

Optionally, the switching device includes:

The two-position five-way valve is provided with a first shell and a first valve core, the first valve core is movably arranged in the first shell and is provided with a first working position and a second working position on the moving stroke, when the first valve core is positioned at the first working position, the third pipeline is communicated with the atmosphere, the first pipeline is communicated with the air compressor, and when the first valve core is positioned at the second working position, the third pipeline is communicated with the air compressor, and the first pipeline is communicated with the atmosphere;

The foot switch is in transmission connection with the first valve core and is used for driving the first valve core to move to the first working position; and

And the return spring is in transmission connection with the first valve core or the foot switch and is used for resetting the first valve core to the second working position.

Optionally, the blocking switch includes:

The switch component is arranged on the cylinder barrel of the hydraulic pressure head and is respectively communicated with the second pipeline and the third pipeline; and

The blocking piece is arranged on the piston rod of the hydraulic pressure head, when the blocking piece is matched with the switch assembly, the blocking switch is in a blocking state, and when the blocking piece is separated from the switch assembly, the blocking switch is in a closing state.

Optionally, the switch assembly includes:

The connecting piece is used for being fixedly connected with the cylinder barrel of the hydraulic pressure head and is provided with a first connecting hole and a second connecting hole which are opposite to each other, one end of the first connecting hole is communicated with the third pipeline, and one end of the second connecting hole is communicated with the second pipeline;

The movable piece is movably arranged in the connecting piece along the up-down direction and is provided with a closed position and a blocking position on the movable stroke, when the movable piece is positioned at the closed position, the other end of the first connecting hole is communicated with the other end of the second connecting hole, and when the movable piece is positioned at the blocking position, the other end of the second connecting hole is communicated with the atmosphere;

the jacking piece is fixedly connected to the lower end of the movable piece and moves the movable piece to the blocking position when being matched with the blocking piece; and

And the resetting piece is arranged in the connecting piece, is in transmission connection with the movable piece and is used for resetting the movable piece to the closed position.

Optionally, the movable part is provided with a first air passage and a second air passage;

When the movable piece is positioned at the closed position, one end of the first air passage is communicated with the first connecting hole, and the other end of the first air passage is communicated with the second connecting hole;

When the movable piece is positioned at the blocking position, one end of the second air path is communicated with the second connecting hole, and the other end of the second air path is used for communicating with the atmosphere.

Optionally, the pneumatic control system further comprises an electronic control assembly, the electronic control assembly comprising:

the first switch comprises a first button and a first base, the first button is arranged on the foot switch, the first base is arranged on the first shell, and when the first valve core is positioned at the first working position, the first button is in conductive contact with the first base; and

The second switch comprises a second button and a second base, the second button is arranged on the movable piece, the second base is arranged on the connecting piece, and when the movable piece is positioned at the blocking position, the second button is disconnected with the second base;

The first switch and the second switch are used for being connected into a circuit of the air compressor in parallel, and when the first switch and/or the second switch are in a conductive state, the air compressor is in a starting working state.

Optionally, the first casing is provided with a first side and a second side which are opposite, the first side is provided with a first air outlet and a second air outlet at intervals along the up-down direction, the second side is provided with a first air outlet, an air inlet and a second air outlet at intervals along the up-down direction in sequence, the first air outlet is communicated with the first pipeline, the second air outlet is communicated with the third pipeline, the air inlet is communicated with the air compressor, and the first air outlet and the second air outlet are communicated with the atmosphere;

When the first valve core is positioned at the first working position, the first air outlet is communicated with the air inlet, and the second air outlet is communicated with the second air outlet;

when the first valve core is located at the second working position, the first air outlet is communicated with the first air outlet, and the second air outlet is communicated with the air inlet.

Optionally, the switching device includes:

The two-position five-way electromagnetic valve is provided with a second shell, a second valve core and an electromagnetic device, wherein the second valve core is movably arranged in the second shell and is provided with a third working position and a fourth working position on the moving stroke, when the second valve core is positioned at the third working position, the third pipeline is used for communicating with the atmosphere, the first pipeline is used for communicating with the air compressor, when the second valve core is positioned at the fourth working position, the third pipeline is used for communicating with the air compressor, the first pipeline is used for communicating with the atmosphere, and the electromagnetic device is used for driving the second valve core to move; and

The control switch is electrically connected with the electromagnetic device and used for controlling the electromagnetic device to drive the second valve core to move between the third working position and the fourth working position.

The invention also provides a gantry hydraulic machine, which comprises any one of the pneumatic control systems.

According to the technical scheme, a piston rod of the air cylinder is in transmission connection with the control valve so as to drive the operation valve to move on the moving stroke of the control valve, one of two cavities of the air cylinder is switched by the switching device to be communicated with the air compressor, the other cavity of the air cylinder is communicated with the atmosphere so that the piston rod of the air cylinder stretches out or retracts, the blocking switch is arranged on the hydraulic pressure head, one of the cavities of the air cylinder is communicated with the switching device through the first pipeline, the other cavity of the air cylinder is communicated with the blocking switch through the second pipeline, the third pipeline is communicated with the blocking switch and the ventilation device, a worker uses a foot to control the switching device to switch the communication relation between the communication pipelines so as to control the movement of the air cylinder, and then control the movement of the hydraulic pressure head so as to finish workpiece press-fitting, after the switching device is released, the system reversely operates, the hydraulic pressure head moves upwards and triggers the blocking switch so that the second pipeline and the third pipeline are disconnected and communicated with the atmosphere, and then the gantry type hydraulic press automatically stops operating.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a pneumatic control system according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A1;

fig. 3 is a partial enlarged view at A2 in fig. 1.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	Pneumatic control system	23	Reset spring
1	Cylinder	3	Blocking switch
				11	Upper cavity	31	Switch assembly
12	Lower cavity	311	Connecting piece
				2	Switching device	3111	First connecting hole
21	Two-position five-way valve	3112	Second connecting hole
				211	First shell body	312	Movable piece
2111	First air outlet	3121	First air path
				2112	Second air outlet	3122	Second air path
2113	First exhaust port	313	Jacking piece
				2114	Second exhaust port	314	Reset piece
2115	Air inlet	32	Blocking piece
				2116	Upper limit protrusion	4	Communication pipeline
2117	Lower limit bulge	41	First pipeline
				212	First valve core	42	Second pipeline
2121	Isolation ring	43	Third pipeline
				2122	Limiting ring	200	Control valve
22	Foot switch	201	Control rod

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Because the cost of the numerical control system is higher, the existing gantry hydraulic press is rarely applied, still depends on manual operation, workers need to overcome the elasticity 40-50N of the valve core spring in the control valve in the whole process when pressing the workpiece, press down or push up the control rod, and switch the direction of the control rod or loosen the control rod according to the pressing progress, the whole process is complex in operation, consumes long time, requires a great deal of effort, and the workers are likely to cause unqualified pressing quality of the workpiece without attention, even cause safety accidents.

To this end, the present invention proposes a pneumatic control system 100 for a gantry hydraulic press comprising a hydraulic ram and a pilot valve 200, referring to fig. 1 to 3, the pneumatic control system 100 comprising: the control valve comprises a cylinder 1, a switching device 2, a blocking switch 3 and a communication pipeline 4, wherein a piston rod of the cylinder 1 is in transmission connection with the control valve 200 so as to drive the control valve 200 to move on the moving stroke of the control valve; the switching device 2 is used for switching one of two cavities of the air cylinder 1 to be communicated with the air compressor, and the other cavity is communicated with the atmosphere so as to enable a piston rod of the air cylinder 1 to extend or retract; the blocking switch 3 is arranged on the hydraulic pressure head; the communication pipeline 4 comprises a first pipeline 41, a second pipeline 42 and a third pipeline 43, wherein the first pipeline 41 is used for communicating one of the cavities of the air cylinder 1 with the switching device 2, the second pipeline 42 is used for communicating the other cavity of the air cylinder 1 with the blocking switch 3, and the third pipeline 43 is used for communicating the blocking switch 3 with the air exchanging device; when the blocking switch 3 is closed, the second pipeline 42 is communicated with the third pipeline 43, and when the blocking switch 3 is opened, the second pipeline 42 is disconnected from the third pipeline 43, and the second pipeline is used for being communicated with the atmosphere.

In the standby state, the third pipe 43 communicates with the air compressor, the first pipe 41 communicates with the atmosphere, the blocking switch 3 is closed, the worker controls the switching device 2 by foot, the third pipe 43 is connected to the atmosphere, the first pipeline 41 is communicated with the air compressor, high-pressure air in the air compressor sequentially enters a cavity of the air cylinder 1 through the switching device 2 and the first pipeline 41, so that the air cylinder 1 controls the control rod 201 of the control valve 200 to move, and then the hydraulic pressure head is pressed down, after the press fitting is completed, the worker releases the switching device 2, the third pipeline 43 is communicated with the air compressor, the first pipeline 41 is communicated with the atmosphere, high-pressure air in the air compressor sequentially enters the other cavity of the air cylinder 1 through the switching device 2, the third pipeline 43, the blocking switch 3 and the second pipeline 42, so that the air cylinder 1 moves reversely to further control the control rod 201 of the control valve 200 to move reversely, the hydraulic pressure head moves upwards, when the hydraulic pressure head returns to the initial position, the blocking switch 3 is triggered to be in an off state, the second line 42 and the third line 43 are disconnected from each other, which is in communication with the atmosphere, when the air pressures in the two chambers of the cylinder 1 are equal, the pilot valve 200 returns to the original position under the action of the built-in spring, so that the hydraulic ram stops moving, simultaneously make the piston of cylinder 1 gets back to initial position, the whole process only need the workman trample or loosen switching device 2 can, easy operation is swift, liberates workman's both hands, makes the pressure equipment process more light.

It should be noted that, the pneumatic control system 100 provided by the invention can be designed integrally, and can be produced together with the gantry hydraulic machine when the gantry hydraulic machine is manufactured, and can be used as a part of the gantry hydraulic machine, or can be designed separately, and then the pneumatic control system 100 is connected with the gantry hydraulic machine through welding or other processes, so that the existing traditional gantry hydraulic machine can be modified conveniently when the split design is used, thereby being beneficial to saving the cost and avoiding the waste of resources.

Specifically, in this embodiment, the cylinder 1 is disposed above the control valve 200, and a piston rod of the cylinder 1 is movable up and down and is in driving connection with the control rod 201 of the control valve 200; the cavity of the cylinder 1 far away from the control valve 200 is an upper cavity 11, the cavity close to the control valve 200 is a lower cavity 12, the first pipeline 41 is communicated with the lower cavity 12, and the second pipeline 42 is communicated with the upper cavity 11.

The control rod 201 of the control valve 200 is generally disposed at an upper position, when the control rod 201 is pressed down, the hydraulic pressure head moves downward, when the control rod 201 is pushed up, the hydraulic pressure head moves upward, the cylinder 1 is disposed above the control valve 200, so that a piston rod of the cylinder 1 is in transmission connection with the control rod 201, and is adapted to the control rod, the lower cavity 12 is communicated with the first pipeline 41, the upper cavity 11 is communicated with the second pipeline 42, so that when the switching device 2 is stepped on, high-pressure gas is input into the lower cavity 12, when the switching device 2 is released, high-pressure gas is input into the upper cavity 11, and the other cavity is communicated with the atmosphere, so that the piston rod of the cylinder 1 moves in a corresponding direction, and the control rod 201 is driven to move.

It should be noted that, the cylinder 1 may also be disposed below the control valve 200, and be connected to the control rod 201 through a bent rod, and the arrangement of the upper cavity 11 and the lower cavity 12, and the connection relationship between the first pipeline 41 and the second pipeline 42 are correspondingly changed to adapt to the arrangement, so that the operation of the pneumatic control system 100 corresponds to the gantry hydraulic press, and the arrangement is only a change of the layout position, and no other matters are included, so that redundant description is omitted, but it should be noted that the manner of changing the arrangement is also within the scope of the present application.

Further, in the present embodiment, the switching device 2 includes: the two-position five-way valve 21 is provided with a first shell 211 and a first valve core 212, the first valve core 212 is movably arranged in the first shell 211 and is provided with a first working position and a second working position on the moving stroke, when the first valve core 212 is positioned at the first working position, the third pipeline 43 is used for communicating with the atmosphere, the first pipeline 41 is used for communicating with the air compressor, and when the first valve core 212 is positioned at the second working position, the third pipeline 43 is used for communicating with the air compressor, and the first pipeline 41 is used for communicating with the atmosphere; the foot switch 22 is in transmission connection with the first valve core 212 and is used for driving the first valve core 212 to move to the first working position; and a return spring 23, in driving connection with the first valve core 212 or the foot switch 22, for resetting the first valve core 212 to the second working position.

The two-position five-way valve 21 can be arranged on the main body of the gantry hydraulic machine, can be arranged on the ground, can be movably arranged, can be correspondingly adjusted according to actual requirements, can be arranged along the horizontal direction and can also be arranged along the vertical direction, specifically, in the embodiment, the two-position five-way valve 21 is arranged on the main body of the gantry hydraulic machine and is positioned below a press mounting platform, so that a worker can quickly find the position of the two-position five-way valve when the worker performs press mounting, the two-position five-way valve 21 is arranged along the vertical direction, the first valve core 212 moves up and down, the worker downwards steps on the foot switch 22, the first valve core 212 can be moved to the first working position from the second working position, the reset spring 23 is arranged in the first housing 211, one end of the reset spring 23 is connected with the first housing 211, when the first valve core 212 moves to the first working position from the second working position, the first valve core 212 moves to the first working position, the reset spring 23 moves to the first working position, and the reset spring 23 returns to the first working position when the first valve core 23 moves to the first working position.

Further, in the present embodiment, the blocking switch 3 includes: the switch assembly 31 is arranged on the cylinder barrel of the hydraulic pressure head and is respectively communicated with the second pipeline 42 and the third pipeline 43; and the blocking piece 32 is arranged on the piston rod of the hydraulic pressure head, when the blocking piece 32 is matched with the switch assembly 31, the blocking switch 3 is in a blocking state, and when the blocking piece 32 is separated from the switch assembly 31, the blocking switch 3 is in a closing state.

The switch assembly 31 is arranged on the cylinder barrel of the hydraulic pressure head, the blocking piece 32 is fixedly connected to the piston rod of the hydraulic pressure head, when the piston rod of the hydraulic pressure head moves, the blocking piece 32 moves up and down along with the piston rod of the hydraulic pressure head, when the hydraulic pressure head is at an initial position, the blocking piece 32 is matched with the switch assembly 31 so as to enable the second pipeline 42 and the third pipeline 43 to be communicated, when the hydraulic pressure head moves downwards, the blocking piece 32 is driven to move downwards, the blocking piece 32 is separated from the switch assembly 31 so as to enable the second pipeline 42 and the third pipeline 43 to be disconnected, the second pipeline 42 is communicated with the atmosphere, and after a worker releases the foot switch 22, when the hydraulic pressure head moves upwards, the hydraulic pressure head can automatically cut off a gas path when returning to the initial position, so that the piston of the control valve 200 returns to the initial position, and the hydraulic pressure head is automatically stopped from moving.

Still further, referring to fig. 3, the switch assembly 31 includes: the connecting piece 311 is fixedly connected with the cylinder barrel of the hydraulic pressure head, and is provided with a first connecting hole 3111 and a second connecting hole 3112 which are opposite, one end of the first connecting hole 3111 is communicated with the third pipeline 43, and one end of the second connecting hole 3112 is communicated with the second pipeline 42; a movable member 312 movably disposed in the connecting member 311 in a vertical direction, and having a closed position and a blocking position on a movable stroke thereof, wherein when the movable member 312 is in the closed position, the other end of the first connecting hole 3111 is used for communicating with the other end of the second connecting hole 3112, and when the movable member 312 is in the blocking position, the other ends of the first connecting hole 3111 and the second connecting hole 3112 are both used for communicating with the atmosphere; the jacking piece 313 is fixedly connected to the lower end of the movable piece 312, and moves the movable piece 312 to the blocking position when being matched with the blocking piece 32; and a resetting piece 314, disposed in the connecting piece 311, in driving connection with the movable piece 312, for resetting the movable piece 312 to the closed position.

The connecting piece 311 is fixedly connected with the cylinder barrel of the hydraulic pressure head, when the hydraulic pressure head is at the initial position, the movable piece 312 is located at the blocking position, the hydraulic pressure head moves downwards to drive the blocking piece 32 to move downwards, the jacking piece 313 loses the pushing force of the blocking piece 32 and does not limit the movable piece 312 any more, the movable piece 312 moves downwards to the closing position under the action of the resetting piece 314, after the pressing is completed, the hydraulic pressure head moves upwards, the blocking piece 32 moves to be in contact with the jacking piece 313, and pushes the jacking piece 313 to move upwards, so that the movable piece 312 is pushed to move to the blocking position, at the moment, the pressure on two sides of a piston rod of the cylinder 1 is equal, no longer exerts a pulling force on the control rod 201, the piston of the control valve 200 returns to the original position under the action of the resetting spring, and the hydraulic pressure head automatically stops moving.

Specifically, in this embodiment, the reset element 314 is a spring, and is disposed at the top of the movable element 312, one end of the reset element is fixedly connected with the movable element 312, and the other end of the reset element is fixedly connected with the connecting element 311, and in other embodiments, the reset element 314 may be other elastic devices or an electromagnet, and the related arrangement structure is simple to change, and will not be repeated herein.

In order to enable the movable member 312 to quickly change the connection relationship between the first connection hole 3111 and the second connection hole 3112 by moving up and down, in this embodiment, a first air channel 3121 and a second air channel 3122 are provided in the movable member 312, when the movable member 312 is in the closed position, one end of the first air channel 3121 is connected to the first connection hole 3111, and the other end is connected to the second connection hole 3112; when the movable member 312 is located at the blocking position, one end of the second air channel 3122 is connected to the second connection hole 3112, and the other end is connected to the atmosphere.

So set up, so when first connecting hole 3111 and second connecting hole 3112 communicate each other, through first gas circuit 3121 between second pipeline 42 and the third pipeline 43 communicate each other, in order to carry high-pressure gas to upper cavity 11, perhaps make lower cavity 12 communicate with the atmosphere, when first connecting hole 3111 with second connecting hole 3112 break, second gas circuit 3122 is used for making second pipeline 42 and atmosphere communicate, so that make the piston both sides pressure of cylinder 1 equals, and then makes control rod 201 no longer receives exogenic action, control valve 200 returns to initial condition, the hydraulic ram stops moving.

It should be noted that, in this embodiment, at this time, one end of the first connection hole 3111 near the movable member 312 is blocked by the movable member 312, and no high-pressure gas in the air compressor is output to the outside, in another embodiment, a third gas path is further provided in the movable member 312, and when the movable member 312 is located at the blocking position, the third gas path makes the other end of the first connection hole 3111 communicate with the atmosphere, so as to avoid that the high-pressure gas in the third pipeline is too much, and the connection between the third pipeline and other structures is damaged, or the air compressor is damaged.

Further, in the present embodiment, the pneumatic control system 100 further includes an electrical control assembly, the electrical control assembly includes a first switch and a second switch, the first switch includes a first button and a first base, the first button is disposed on the foot switch 22, the first base is disposed on the first housing 211, and when the first valve element 212 is located in the first working position, the first button is in conductive contact with the first base; the second switch comprises a second button and a second base, the second button is arranged on the movable piece 312, the second base is arranged on the connecting piece 311, and when the movable piece 312 is positioned at the blocking position, the second button is disconnected from the second base; the first switch and the second switch are used for being connected into a circuit of the air compressor in parallel, and when the first switch and/or the second switch are in a conductive state, the air compressor is in a starting working state.

When the gantry hydraulic press does not press the workpiece, the first switch and the second switch are powered off, the air compressor is in an off-line state, no high-pressure gas is generated, a worker steps on the foot switch 22 to enable the first valve core 212 to move to the first working position, the first switch is powered on, the air compressor is synchronously started, and the pneumatic control system 100 can work normally; after the blocking member 32 and the jacking member 313 are separated, the movable member 312 moves under the action of the reset member 314, and leaves the blocking position, the second switch is powered on, after the worker releases the foot switch 22, the first switch is powered off, and the air compressor continues to work under the action of the second switch; after the hydraulic pressure head moves upwards to enable the blocking piece 32 to be in contact with the jacking piece 313, the movable piece 312 is pushed to move to the blocking position, the second switch is powered off, the air compressor stops working, and the pneumatic control system 100 is further prevented from being damaged while electricity is saved.

It should be noted that, the setting positions and the sizes of the second button and the second base may be adjusted according to actual needs, so that the movable member 312 leaves the blocking position, and until the movable member 312 moves to the communicating position, the second button and the second base are always in a contact conductive state, and only when the movable member 312 is in the blocking position or is in a very short distance downward from the blocking position, the second button and the second base are in a separated power-off state, and the movable member 312 can move to the blocking position after the air compressor stops working, so that the actual adjustment only involves a change of the contact length, which is not repeated.

In addition, the electric control component is not required to be arranged, and when a plurality of gantry hydraulic presses are simultaneously provided with the pneumatic control system 100 and the pneumatic control system 100 shares one air compressor, the electric control component is omitted so as not to interfere with each other, and meanwhile, the air compressor is prevented from being frequently started and stopped in a short time, so that the air compressor is prevented from being damaged. Specifically, the specific model of the air compressor is not limited herein, and the air compressor is considered to supply the air control system 100 according to the pressure required in the actual working condition.

Specifically, in this embodiment, referring to fig. 2, the first housing 211 is provided with a first side and a second side opposite to each other, a first air outlet 2111 and a second air outlet 2112 are provided at intervals along an up-down direction, a first air outlet 2113, an air inlet 2115 and a second air outlet 2114 are provided at intervals along an up-down direction, the first air outlet 2111 is in communication with the first pipeline 41, the second air outlet 2112 is in communication with the third pipeline 43, the air inlet 2115 is in communication with the air compressor, and the first air outlet 2113 and the second air outlet 2114 are in communication with the atmosphere; when the first valve core 212 is located at the first working position, the first air outlet 2111 is communicated with the air inlet 2115, and the second air outlet 2112 is communicated with the second air outlet 2114; when the first valve element 212 is located at the second working position, the first air outlet 2111 is communicated with the first air outlet 2113, and the second air outlet 2112 is communicated with the air inlet 2115.

So configured, the first valve element 212 changes the communication relationship between the air ports provided on the first side and the second side by moving, thereby rapidly switching the air inlet and outlet states of the upper and lower chambers 12.

Correspondingly, in this embodiment, a plurality of spacer rings 2121 are disposed on the first valve core 212, the communication relationship between the first side and the second side air ports is switched by the spacer rings 2121, meanwhile, an upper limit protrusion 2116 and a lower limit protrusion 2117 are disposed on the first housing 211, a limit ring 2122 is disposed on the first valve core 212, and the limit ring 2122 is located between the upper limit protrusion 2116 and the lower limit protrusion 2117, so as to limit the movement range of the first valve core 212, when the limit ring 2122 abuts against the upper limit protrusion 2116, the first valve core 212 is located in the second working position, and when the limit ring 2122 abuts against the lower limit protrusion 2117, the first valve core 212 is located in the first working position.

Further, in another embodiment, the switching device 2 includes: the two-position five-way electromagnetic valve is provided with a second shell, a second valve core and an electromagnetic device, wherein the second valve core is movably arranged in the second shell and is provided with a third working position and a fourth working position on the moving stroke, when the second valve core is positioned at the third working position, the third pipeline 43 is used for communicating with the atmosphere, the first pipeline 41 is used for communicating with the air compressor, when the second valve core is positioned at the fourth working position, the third pipeline 43 is used for communicating with the air compressor, the first pipeline 41 is used for communicating with the atmosphere, and the electromagnetic device is used for driving the second valve core to move; and the control switch is electrically connected with the electromagnetic device to control the electromagnetic device to drive the second valve core to move between the third working position and the fourth working position.

The second housing and the second valve core have the same functions as the first housing 211 and the first valve core 212, and are not described in detail herein, the electromagnetic device is used to drive the second valve core to move, so that the operation of a worker is more labor-saving, and compared with the foot switch 22, the control switch does not need to step on the distance between the first working position and the second working position, and is more convenient than the foot switch 22.

It should be noted that, the setting position of the control switch is not limited to being stepped on by foot, and is an electrical original, and is set at a higher position, so that the control switch is also convenient to operate by hand, and can be adjusted according to actual needs, and the related technology of the two-position five-way electromagnetic valve is very mature, and is not repeated here.

The invention also provides a gantry hydraulic machine, which comprises the pneumatic control system 100 according to any one of the embodiments, and the specific structure of the pneumatic control system 100 refers to the embodiments, and since the gantry hydraulic machine adopts all the technical schemes of all the embodiments, the gantry hydraulic machine has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A pneumatic control system for a gantry hydraulic press comprising a hydraulic ram and a pilot valve, the pneumatic control system comprising:

The blocking switch is arranged on the hydraulic pressure head; and

The communication pipeline comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is used for communicating one of cavities of the air cylinder with the switching device, the second pipeline is used for communicating the other cavity of the air cylinder with the blocking switch, and the third pipeline is used for communicating the blocking switch with the switching device;

When the blocking switch is closed, the second pipeline is communicated with the third pipeline, and when the blocking switch is opened, the second pipeline is disconnected from the third pipeline and is communicated with the atmosphere;

the blocking switch includes:

The blocking piece is arranged on a piston rod of the hydraulic pressure head, when the blocking piece is matched with the switch assembly, the blocking switch is in a blocking state, and when the blocking piece is separated from the switch assembly, the blocking switch is in a closing state;

the switch assembly includes:

The resetting piece is arranged in the connecting piece, is in transmission connection with the movable piece and is used for resetting the movable piece to the closed position;

the movable piece is provided with a first air passage and a second air passage;

2. The pneumatic control system of claim 1, wherein the cylinder is configured to be disposed above the pilot valve, and a piston rod of the cylinder is movable up and down and is in driving connection with a pilot rod of the pilot valve;

3. The pneumatic control system of claim 2, wherein the switching means comprises:

4. The pneumatic control system of claim 3, further comprising an electronic control assembly, the electronic control assembly comprising:

5. The pneumatic control system of claim 3, wherein,

The first shell is provided with a first side and a second side which are opposite, a first air outlet and a second air outlet are formed in the first side along the upper and lower directions at intervals, a first air outlet, an air inlet and a second air outlet are formed in the second side along the upper and lower directions at intervals in sequence, the first air outlet is communicated with the first pipeline, the second air outlet is communicated with the third pipeline, the air inlet is communicated with the air compressor, and the first air outlet and the second air outlet are communicated with the atmosphere;

6. The pneumatic control system of claim 2, wherein the switching means comprises:

7. A gantry hydraulic machine comprising a pneumatic control system as claimed in any one of claims 1 to 6.