Pneumatic pressure switching system

Abstract

The utility model belongs to the field of pneumatic system control, and relates to a pneumatic pressure switching system which comprises an air compressor, a pressure switching electromagnetic valve and a safety grating, a pilot control channel, a high-pressure gas channel and a low-pressure gas channel are arranged between the air compressor and the pressure switching electromagnetic valve, and a pressure reducing valve is arranged on the low-pressure gas channel; the pressure switching electromagnetic valve comprises a pilot air port, a first air inlet, a second air inlet and an air outlet, the pilot control channel, the high-pressure air channel and the low-pressure air channel are connected to the pilot air port, the first air inlet and the second air inlet respectively, and the air outlet is communicated to a pneumatic device through an air supply channel; the safety grating is arranged on the periphery of the working area of the pneumatic device, and the protection signal output end of the safety grating is connected with the electric signal control end of the pressure switching electromagnetic valve. The pneumatic pressure switching system solves the problem of switching working pressure and safety pressure in a pneumatic device, and avoids damage such as clamping injury and squeezing injury.

Description

Technical Field

[0001] The utility model belongs to the field of pneumatic system control and relates to a pneumatic pressure switching system. Background Technique

[0002] In fields such as welding systems and machining systems, there are many pneumatic devices for automatically positioning and clamping workpieces installed inside equipment. Personnel need to detect the entry state of the operator's body through a "channel" with safety detection. Generally, the air pressure inside these devices can reach above 0.6 MPa, and the actuators can generally output pressures ranging from dozens of kilograms to hundreds of kilograms. We call this the working pressure. Under the working pressure, when the operator installs the workpiece inside the equipment and operates the pressing of the actuating element, it is extremely easy to cause injuries such as pinching and squeezing of personnel. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a pneumatic pressure switching system, which solves the problem of switching between working pressure and safety pressure in pneumatic devices and avoids injuries such as pinching and squeezing.

[0004] The technical solution provided by the utility model is as follows:

[0005] The utility model provides a pneumatic pressure switching system, which includes an air compressor, a pressure switching solenoid valve and a safety grating. A pilot control channel, a high-pressure gas channel and a low-pressure gas channel are provided between the air compressor and the pressure switching solenoid valve. A pressure reducing valve is provided on the low-pressure gas channel; the pressure switching solenoid valve includes a pilot air port, a first air inlet, a second air inlet and an air outlet. The pilot control channel, the high-pressure gas channel and the low-pressure gas channel are respectively connected to the pilot air port, the first air inlet and the second air inlet. The air outlet is communicated with the pneumatic device through a gas supply channel; the safety grating is arranged on the periphery of the working area of the pneumatic device, and its protection signal output end is connected to the electrical signal control end of the pressure switching solenoid valve.

[0006] Further, a first three-way pipe and a second three-way pipe are provided between the air compressor and the pressure switching solenoid valve. One side joint of the first three-way pipe is connected to the output end of the air compressor, and the two side joints of the first three-way pipe are respectively connected to the input end of the pilot control channel and one side joint of the second three-way pipe. The two side joints of the second three-way pipe are respectively connected to the input ends of the high-pressure gas channel and the low-pressure gas channel.

[0007] Further, the pressure switching solenoid valve is an externally piloted two-way three-way solenoid valve.

[0008] Further, a pressure gauge is connected to the pressure reducing valve.

[0009] Further, a safety fence is provided around the working area of the pneumatic device. An operation opening is provided on one side of the safety fence. The safety light curtain is arranged on the safety fence, and its light grid covers the operation opening.

[0010] Further, the pneumatic device includes a two-position five-way solenoid valve and a cylinder. The air inlet of the two-position five-way solenoid valve is connected to the air outlet of the pressure switching solenoid valve. The first air outlet and the second air outlet of the two-position five-way solenoid valve are respectively communicated with the air chambers on both sides of the pneumatic piston driving part of the cylinder.

[0011] Further, a control button for controlling the on / off of the power supply line is connected to the power supply line of the coil of the two-position five-way solenoid valve.

[0012] Further, one-way speed control valves are respectively arranged between the first air outlet of the two-position five-way solenoid valve and the air chambers on both sides of the pneumatic piston driving part.

[0013] Further, a fault detection and alarm module is further included. Its fault signal input end is connected to the protection signal output end of the safety light curtain, and its output end outputs an alarm signal. Beneficial effects

[0014] The utility model solves the problems of switching working pressure and safety pressure in the pneumatic device, and avoids injuries such as pinching and squeezing.

[0015] In the pneumatic pressure switching system of the utility model, when the operator reaches into the equipment to operate and triggers the safety light curtain, the safety light curtain sends a safety protection signal to a single electrically controlled solenoid valve (externally piloted). This solenoid valve switches the pressure to the safety air path (compressed gas is reduced to a low pressure state through a pressure reducing valve). When the operator is loading and unloading workpieces inside the equipment, the clamping and loosening of the pneumatic device can be operated in a low-pressure environment. The pressure of the pneumatic device can be reduced to a few kilograms, reducing the risk of the operator being severely pinched by the pneumatic device due to misoperation. When the operator finishes the operation and exits the safety light curtain, the safety light curtain stops outputting the signal, and the single electrically controlled solenoid valve loses power and returns to its original position. High-pressure air enters through the single electrically controlled solenoid valve, and the system switches to the working pressure to provide power for the pneumatic device, enabling strong clamping of the workpiece. Description of the drawings

[0016] Figure 1 It is a schematic structural diagram of a pneumatic pressure switching system of the utility model.

[0017] Description of reference numerals: 1, pressure reducing valve; 2, two-position three-way solenoid valve; 3, two-position five-way solenoid valve; 4, cylinder; 5, one-way speed control valve; 6, control button; 7, workpiece; 8, safety fence; 9, safety light curtain; 10, first three-way pipe; 11, second three-way pipe; C1, first air inlet; C2, second air inlet; C3, air outlet; C4, pilot air port; A, first air outlet; B, first air outlet; R, first exhaust port; S, first exhaust port; P, air inlet. Detailed implementation manners

[0018] The present utility model will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, and cannot be used to limit the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] Embodiment 1

[0021] As Figure 1 shown, this embodiment provides a pneumatic pressure switching system, including an air compressor, a pressure switching solenoid valve, and a safety light curtain 9. A pilot control channel, a high-pressure gas channel, and a low-pressure gas channel are provided between the air compressor and the pressure switching solenoid valve. A pressure reducing valve 1 is provided on the low-pressure gas channel. The pressure switching solenoid valve includes a pilot air port C4, a first air inlet C1, a second air inlet C2, and an air outlet C3. The pilot control channel, the high-pressure gas channel, and the low-pressure gas channel are respectively connected to the pilot air port C4, the first air inlet C1, and the second air inlet C2. The air outlet C3 is communicated with a pneumatic device through a supply channel. The safety light curtain 9 is provided on the periphery of the working area of the pneumatic device, and its protection signal output end is connected to the electrical signal control end of the pressure switching solenoid valve.

[0022] In this embodiment, a first three-way pipe 10 and a second three-way pipe 11 are provided between the air compressor and the pressure switching solenoid valve. One side joint of the first three-way pipe 1 is connected to the output end of the air compressor. The two side joints of the first three-way pipe are respectively connected to the input end of the pilot control channel and one side joint of the second three-way pipe 11. The two side joints of the second three-way pipe 11 are respectively connected to the input ends of the high-pressure gas channel and the low-pressure gas channel.

[0023] In this embodiment, the pressure switching solenoid valve is an externally piloted two-position three-way solenoid valve 2.

[0024] In this embodiment, a pressure gauge is connected to the pressure reducing valve 1.

[0025] In this embodiment, a safety fence 8 is provided in the working area of the pneumatic device. An operation port is provided on one side of the safety fence 8. The safety light curtain 9 is arranged on the safety fence 8, and its light grid covers the operation port. As Figure 1 shown, the safety fence 8 can also be arranged around the system. Two safety light curtains 9 are symmetrically provided, which is beneficial to expanding the protection range and forming a double safety protection to prevent personnel from straying into dangerous areas and ensure the safety of operators.

[0026] Specifically, when the two-way three-way solenoid valve 2 is working, it usually requires a gas source (such as compressed air) to drive its action. This gas source is connected to the pilot air port C4 of the two-way three-way solenoid valve 2, and then the air path is switched according to the control signal of the solenoid valve (the protection signal sent by the safety light curtain 9). When the operator reaches into the area monitored by the safety light curtain 9, the light beam is blocked, thereby triggering the safety light curtain 9 to send out a safety protection signal. This signal is transmitted to the electrical signal control end of the two-way three-way solenoid valve 2. After receiving the signal, the two-way three-way solenoid valve 2 is energized and shifted, and its internal channel is correspondingly adjusted, that is, the second air inlet C2 communicates with the air outlet C3, so that the high-pressure air output from the air compressor enters the adjusted internal channel through the pressure reducing valve 1 and then enters the pneumatic device; when the operator completes the operation and exits the area monitored by the safety light curtain 9, the safety light curtain 9 stops outputting the signal, the two-way three-way solenoid valve 2 loses power and returns to its original position, and its internal channel is correspondingly adjusted, that is, the first air inlet C1 communicates with the air outlet C3, so that the high-pressure air output from the air compressor enters the adjusted internal channel and then enters the pneumatic device.

[0027] In this embodiment, the pneumatic device includes a two-way five-way solenoid valve 3 and a cylinder 4. The air inlet P of the two-way five-way solenoid valve 5 is connected to the air outlet C3 of the pressure switching solenoid valve. The first air outlet A and the second air outlet B of the two-way five-way solenoid valve 3 are respectively communicated with the air chambers on both sides of the pneumatic piston driving part of the cylinder.

[0028] In this embodiment, the power supply line of the coil of the two-way five-way solenoid valve 3 is connected with a control button 6 for controlling the on-off of the power supply line.

[0029] In this embodiment, one-way speed control valves 5 are respectively arranged between the first air outlet A of the two-way five-way solenoid valve 3 and the air chambers on both sides of the pneumatic piston driving part, for adjusting the movement speed of the cylinder piston and improving the control accuracy and stability of the system.

[0030] Specifically, when the left coil of the five-port two-position solenoid valve 4 is energized by the control button 6, the air inlet P of the solenoid valve communicates with the second air outlet B. Low-pressure air or high-pressure air enters the air chamber on one side of the pneumatic piston driving part of the cylinder 4 from the second air outlet B, pushing the piston to the other side of the cylinder 4. The first air outlet A communicates with the first exhaust port R, and the air chamber on the other side of the pneumatic piston driving part communicating with the first air outlet A is in the exhaust state and will remain in this state until the other coil is de-energized, realizing the relaxation of the workpiece 7. When the right coil of the five-port two-position solenoid valve 4 is energized by the control button 6, the air inlet P of the solenoid valve communicates with the first air outlet A. Low-pressure air or high-pressure air enters the air chamber on one side of the pneumatic piston driving part of the cylinder 4 from the first air outlet A, pushing the piston to the other side of the cylinder 4. The second air outlet B communicates with the second exhaust port S, and the air chamber on the other side of the pneumatic piston driving part communicating with the second air outlet B is in the exhaust state and will remain in this state until the other coil is de-energized, realizing the clamping of the workpiece 7.

[0031] In this embodiment, a fault detection and alarm module is further included. Its fault signal input terminal is connected to the protection signal output terminal of the safety grating 9, and its output terminal outputs an alarm signal.

[0032] Specifically, the fault detection and alarm module can monitor the operating state of the system in real time. Once a fault or abnormal situation is detected, it immediately issues an alarm signal, cuts off the relevant air circuits to prevent the expansion of the accident, and at the same time provides fault diagnosis information to facilitate the maintenance personnel to quickly locate and solve the problem.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic pressure switching system, characterized in that: It includes an air compressor, a pressure switching solenoid valve and a safety grating, wherein a pilot control channel, a high-pressure gas channel and a low-pressure gas channel are arranged between the air compressor and the pressure switching solenoid valve, and a pressure reducing valve is arranged on the low-pressure gas channel; the pressure switching solenoid valve includes a pilot air port, a first air inlet, a second air inlet and an air outlet, the pilot control channel, the high-pressure gas channel and the low-pressure gas channel are respectively connected to the pilot air port, the first air inlet and the second air inlet, and the air outlet is connected to the pneumatic device through an air supply channel; the safety grating is arranged on the periphery of the working area of ​​the pneumatic device, and its protection signal output end is connected to the electrical signal control end of the pressure switching solenoid valve.

2. The pneumatic pressure switching system according to claim 1, characterized in that: A first three-way pipe and a second three-way pipe are provided between the air compressor and the pressure switching solenoid valve, a single-side joint of the first three-way pipe is connected to the output end of the air compressor, two-side joints of the first three-way pipe are respectively connected to the input end of the pilot control channel and the single-side joint of the second three-way pipe, and two-side joints of the second three-way pipe are respectively connected to the input end of the high-pressure gas channel and the input end of the low-pressure gas channel.

3. The pneumatic pressure switching system according to claim 1, characterized in that: The pressure switching solenoid valve is a two-position three-way solenoid valve with an external pilot.

4. The pneumatic pressure switching system according to claim 1, characterized in that: The pressure reducing valve is connected with a pressure gauge.

5. The pneumatic pressure switching system according to claim 1, characterized in that: A safety fence is arranged around the working area of ​​the pneumatic device, an operation opening is arranged on one side of the safety fence, and the safety grating is arranged on the safety fence, and the grating covers the operation opening.

6. The pneumatic pressure switching system according to claim 1, characterized in that: The pneumatic device includes a two-position five-way solenoid valve and a cylinder. The air inlet of the two-position five-way solenoid valve is connected to the air outlet of the pressure switching solenoid valve, and the first air outlet and the second air outlet of the two-position five-way solenoid valve are respectively connected to the air chambers on both sides of the pneumatic piston driving part of the cylinder.

7. The pneumatic pressure switching system according to claim 6, characterized in that: The power supply circuit of the coil of the two-position five-way solenoid valve is connected with a control button for controlling the on and off of the power supply circuit.

8. The pneumatic pressure switching system according to claim 6, characterized in that: One-way speed regulating valves are respectively arranged between the first air outlet of the two-position five-way solenoid valve and the air chambers on both sides of the pneumatic piston driving part.

9. The pneumatic pressure switching system according to claim 1, characterized in that: It also includes a fault detection and alarm module, whose fault signal input end is connected to the protection signal output end of the safety grating, and whose output end outputs an alarm signal.

Images